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TWI872165B - Printing unit and thermal printer - Google Patents

Printing unit and thermal printer Download PDF

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Publication number
TWI872165B
TWI872165B TW109141510A TW109141510A TWI872165B TW I872165 B TWI872165 B TW I872165B TW 109141510 A TW109141510 A TW 109141510A TW 109141510 A TW109141510 A TW 109141510A TW I872165 B TWI872165 B TW I872165B
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Taiwan
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stage
locking
gear
unit
aforementioned
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TW109141510A
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Chinese (zh)
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TW202128445A (en
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吉川史高
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日商精工電子有限公司
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Publication of TWI872165B publication Critical patent/TWI872165B/en

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Abstract

A printing unit includes: a head unit including a thermal head configured to perform printing on a recording sheet; a platen unit which is detachably combined with the head unit, and includes: a platen roller configured to feed the recording sheet; and a pair of platen bearings configured to support both end portions of the platen roller in a rotatable manner; an operation lever which is movable about a rotation axis between a lock position of locking the platen unit to the head unit and an unlock position of unlocking the platen unit from the head unit; a platen lock mechanism which includes a lock arm swingable about a swing axis parallel to the platen roller, and is configured to switch the lock arm between a lock state of locking the platen roller and an unlock state of unlocking the platen roller; and an urging member configured to urge the lock arm about the swing axis so as to maintain the lock state. The head unit has a pair of receiving grooves which is configured to allow the pair of platen bearings to be fitted therein through openings of the pair of receiving grooves, and configured to receive the pair of platen bearings in contact with groove bottom portions of the pair of receiving grooves when the operation lever is at the lock position. The lock arm is configured to press at least one of the pair of platen bearings received in the receiving groove from the opening side when the operation lever is at the lock position, and is configured to allow disengagement of the at least one of the pair of platen bearings from the receiving groove through the opening by being swung about the swing axis along with movement of the operation lever from the lock position toward the unlock position side. The lock arm includes a pushing-up arm configured to push the at least one of the pair of platen bearings from the groove bottom portion toward the opening side along with movement of the operation lever from the lock position toward the unlock position. The urging member urges the lock arm toward the platen unit side.

Description

列印單元以及熱列印機Printing unit and thermal printer

本發明，係關於列印單元以及熱列印機。The present invention relates to a printing unit and a thermal printer.

作為熱列印機，已知有組合為能夠使熱感頭及載台滾輪分離者。 例如，已知有一種熱列印機，係於收納捲筒紙的框體側設置有具有熱感頭的頭部單元，並於以能夠對於框體進行開閉操作可能的方式連結的列印機罩側設置有具有載台滾輪的載台單元。依據該熱列印機，能夠組合為伴隨列印機罩的開閉操作使熱感頭及載台滾輪分離。 一般而言，該種熱列印機，係為了防止在組合熱感頭及載台滾輪之際兩者在未意圖的時機分離，多具備保持載台滾輪的鎖定機構。作為鎖定機構，例如已知有利用彈簧構件按壓設於載台軸的兩端部的軸承者。彈簧構件，係在設於框體側的頭部單元，並於軸承溝內嵌入有軸承之際，利用本身的彈性回復力(彈簧力)按壓軸承。藉此，能夠對於軸承溝將軸承以一定的按壓力按壓，而能夠鎖定(保持)載台滾輪。 然而，在利用彈簧構件鎖定載台滾輪的情形，僅是藉由彈簧構件按壓軸承，故載台滾輪的鎖定容易變得不充分。因此，例如於載台滾輪作用有外力時，會有軸承往從軸承溝內脫離的方向移動之虞。因此，一體設置於軸承之從動齒輪及用以驅動載台滾輪的齒輪系之嚙合會變得不充分，而會有產生所謂跳齒之問題，或嚙合本身解除之問題的可能性。並且，亦會有軸承從軸承溝內脫離而頭部單元與載台單元分離的可能性。特別是，於列印機罩設有載台單元的情形，外力容易透過載台罩作用於載台滾輪，故容易產生前述之問題。 作為前述之問題的對策，例如考慮到使彈簧構件的彈簧力增大。然而，在此情形，於使頭部單元與載台單元分離之際，軸承會難以從軸承溝內脫離，故必須有較大的力使載台滾輪開放。因此，會導致操作性降低。 因此，已知有利用鎖定臂取代彈簧構件鎖定載台滾輪之採用鎖定臂式的熱列印機。例如，已知有一種熱列印機，其利用用以將熱感頭對於載台滾輪壓接之頭部加壓彈簧之彈簧力，透過鎖定臂將軸承對於軸承溝按壓，藉此鎖定載台滾輪。依據該熱列印機，係與彈簧構件不同，而利用鎖定臂，故能夠避免軸承以從軸承溝內脫離的方式移動之情事。 然而，即便是鎖定臂式，因係利用頭部加壓彈簧的彈簧力將鎖定臂對於軸承按壓，故使載台滾輪開放所必要的力係仰賴於頭部加壓彈簧的彈簧力，且力量容易變得過大。因此，同樣地容易導致操作性降低，而有改善的餘地。 並且，因該種鎖定臂通常構成從載台單元側鎖定軸承，故在解除鎖定的情形，以使鎖定臂從熱感頭側分離的方式往載台單元側移動。因此，有考慮鎖定臂的可動行程量以確保可動空間，故必須將載台單元設計為較大。一般而言，載台單元係構成零件比頭部單元更少，故期望能夠達成小型化、薄型化並設計為較小巧，然而因如前述般必須確保鎖定臂的可動空間，故難以設計為小巧。因此，確保可動空間在結果上會對於列印機整體的尺寸造成影響，而成為設計上的制約。 因此，於該技術領域中，追求一種列印單元及熱列印機，其能夠確實地鎖定載台滾輪，並且能夠藉由些微的操作力順暢地解除鎖定，並且，能夠達成外形尺寸的精簡化。As a thermal printer, there is a known combination that can separate the thermal head and the carrier roller. For example, there is a known thermal printer in which a head unit having a thermal head is provided on the side of a frame that stores roll paper, and a carrier unit having a carrier roller is provided on the side of a printer cover that is connected to the frame in a manner that enables opening and closing operations. According to this thermal printer, it is possible to combine the thermal head and the carrier roller to separate in conjunction with the opening and closing operations of the printer cover. Generally speaking, this type of thermal printer is often equipped with a locking mechanism for holding the carrier roller in order to prevent the thermal head and the carrier roller from being separated at an unintended timing when the thermal head and the carrier roller are combined. As a locking mechanism, for example, there is a known mechanism that uses a spring member to press the bearings provided at both ends of the carrier shaft. The spring member is a head unit provided on the side of the frame, and when the bearing is embedded in the bearing groove, the spring member uses its own elastic restoring force (spring force) to press the bearing. In this way, the bearing can be pressed against the bearing groove with a certain pressing force, and the carrier roller can be locked (held). However, in the case of locking the carrier roller using a spring member, the locking of the carrier roller is likely to become insufficient because the spring member only presses the bearing. Therefore, for example, when an external force acts on the carrier roller, there is a risk that the bearing will move in the direction of disengaging from the bearing groove. Therefore, the engagement of the driven gear integrally provided on the bearing and the gear system for driving the carrier roller will become insufficient, and there is a possibility of a problem of so-called tooth skipping or a problem of the engagement itself being released. In addition, there is a possibility that the bearing will disengage from the bearing groove and the head unit will separate from the carrier unit. In particular, when the printer cover is provided with a carrier unit, external force can easily act on the carrier roller through the carrier cover, so the aforementioned problem can easily occur. As a countermeasure to the aforementioned problem, for example, it is considered to increase the spring force of the spring member. However, in this case, when the head unit and the carrier unit are separated, the bearing will be difficult to disengage from the bearing groove, so a large force must be applied to release the carrier roller. Therefore, the operability is reduced. Therefore, there is a known thermal printer that uses a locking arm to lock the carrier roller instead of a spring member. For example, there is a known thermal printer that uses the spring force of the head pressure spring for pressing the thermal head against the carrier roller to press the bearing against the bearing groove through the locking arm, thereby locking the carrier roller. According to this thermal printer, a locking arm is used instead of a spring member, so that the bearing can be prevented from moving in a manner that it is disengaged from the bearing groove. However, even in the case of a locking arm type, since the locking arm is pressed against the bearing by the spring force of the head pressure spring, the force required to open the carrier roller depends on the spring force of the head pressure spring, and the force is likely to become too large. Therefore, it is also likely to cause a decrease in operability, and there is room for improvement. In addition, since this type of locking arm is usually configured to lock the bearing from the carrier unit side, when the lock is released, the locking arm is separated from the thermal head side and moved to the carrier unit side. Therefore, the movable stroke of the locking arm is taken into consideration to ensure the movable space, so the stage unit must be designed to be larger. Generally speaking, the stage unit has fewer components than the head unit, so it is expected to be miniaturized, thinned and designed to be more compact. However, since the movable space of the locking arm must be ensured as mentioned above, it is difficult to design it to be compact. Therefore, ensuring the movable space will eventually affect the overall size of the printer and become a design constraint. Therefore, in this technical field, a printing unit and a thermal printer are sought that can reliably lock the stage roller, can smoothly unlock it with a slight operating force, and can achieve a simplified external size.

本發明之一形態之列印單元，係具備：頭部單元，係具有對於記錄紙進行列印的熱感頭；載台單元，係具有將前述記錄紙送紙的載台滾輪，及以將前述載台滾輪的兩端部以能夠旋轉的方式分別軸支之一對載台軸承，且對於前述頭部單元以能夠分離的方式組合；操作桿，係能夠在對於前述頭部單元鎖定前述載台單元的鎖定位置與解除對於前述頭部單元之前述載台單元的鎖定的解除鎖定位置之間繞旋轉軸線移動；載台鎖定機構，係具有能夠繞與前述載台滾輪平行的擺動軸線擺動的鎖定臂，並能夠切換為鎖定前述載台滾輪的鎖定狀態及解除該鎖定的解除鎖定狀態；以及推彈構件，係以維持前述鎖定狀態的方式，將前述鎖定臂以繞前述擺動軸線的方式推彈；於前述頭部單元，形成有：一對收容溝，係能夠通過開放口將一對前述載台軸承嵌入至內部，且在前述操作桿位於前述鎖定位置時，將前述載台軸承以相接於溝底部的狀態收容，前述鎖定臂，係在前述操作桿位於前述鎖定位置時，從前述開放口側按壓收容於前述收容溝內之一對前述載台軸承的至少其中一方，且隨著前述操作桿從前述鎖定位置往前述解除鎖定位置側移動，而繞前述擺動軸線擺動，並能夠容許前述載台軸承通過前述開放口從前述收容溝內脫離，於前述鎖定臂，形成有：推起臂，係隨著前述操作桿從前述鎖定位置往前述解除鎖定位置移動，將前述載台軸承從前述溝底部往前述開放口側推起，前述推彈構件，係將前述鎖定臂往前述載台單元側推彈。 另外，本發明之一形態之列印單元，係：前述鎖定臂，隨著前述操作桿從前述鎖定位置往前述解除鎖定位置側移動，從前述載台單元側往前述頭部單元側繞前述擺動軸線擺動，並能夠容許前述載台軸承通過前述開放口從前述收容溝內脫離。 另外，本發明之一形態之列印單元，係：前述推起臂，在前述操作桿位於前述鎖定位置時，對於前述載台軸承為非接觸。 另外，本發明之一形態之列印單元，係：於前述收容溝的內側面，形成有：傾斜的引導突起，係開口寬度從前述開放口側往前述溝底部側縮窄，且將前述載台軸承往前述溝底部引導，前述推起臂，係以使前述載台滾輪的滾輪中心比前述引導突起的頂點部更往前述開放口側移動的方式將前述載台軸承推起。 另外，本發明之一形態之列印單元，係：前述鎖定臂，係配置於隔著前述載台滾輪的兩側，並對應於一對前述載台軸承而設置有一對，前述載台鎖定機構，係具備：連結軸部，係沿著前述擺動軸線延伸並且將一對前述鎖定臂彼此連結。 另外，本發明之一形態之列印單元，係具備：固定刀刃，係設置於前述頭部單元及前述載台單元當中之其中一方；可動刀刃，係設置於前述頭部單元及前述載台單元當中之另一方，並能夠對於前述固定刀刃相對移動；以及驅動機構，係具有連結至前述可動刀刃的驅動齒條，並使前述可動刀刃在遠離前述固定刀刃的待命位置與跨上前述固定刀刃的切斷位置之間移動。 另外，本發明之一形態之列印單元，係具備：回歸機構，係在前述可動刀刃於前述切斷位置停止的狀態下，在前述載台鎖定機構利用伴隨於將前述操作桿從前述鎖定位置往前述解除鎖定位置的操作的操作力將前述載台滾輪切換為前述解除鎖定狀態之前，使前述可動刀刃從前述切斷位置往前述待命位置移動。 另外，本發明之一形態之列印單元，係：前述回歸機構，係具備：回歸齒條，係形成於前述驅動齒條；回歸小齒輪，係嚙合於前述回歸齒條的齒條齒；回歸齒輪及太陽齒輪，係在配置於與前述操作桿的前述旋轉軸線同軸上的狀態下，以能夠繞前述旋轉軸線旋轉的方式被支承；行星齒輪，係嚙合於前述太陽齒輪，並且伴隨於前述操作桿的移動進行公轉；以及內齒輪，係嚙合於前述行星齒輪；前述回歸齒輪，係能夠與前述回歸小齒輪嚙合。 另外，本發明之一形態之列印單元，係：前述齒條齒，係以前述可動刀刃位於前述切斷位置時對於前述回歸小齒輪嚙合，且在前述可動刀刃位於前述待命位置時解除對於前述回歸小齒輪的嚙合的方式，形成於前述可動刀刃的刀尖的相反側。 另外，本發明之一形態之列印單元，係：前述鎖定臂，係具有：直線狀的脫離防止面，係防止前述載台軸承於前述鎖定狀態從連通於前述開放口的前述收容溝內脫離，從前述鎖定臂的旋轉中心通過前述載台軸承的中心的線與前述脫離防止面係垂直相交。 另外，本發明之一形態之列印單元，係具備：載台支承彈簧，係輔助使前述載台軸承被保持於前述收容溝內，前述載台支承彈簧，係在隨著前述操作桿從前述鎖定位置往前述解除鎖定位置側移動，前述推起臂將前述載台軸承推起之前，往解除前述載台軸承的保持的方向移動，容許前述載台軸承從連通於前述開放口的前述收容溝內脫離。 本發明之一形態之熱列印機，係具備：前述列印單元；列印機本體，係具有收容前述記錄紙的記錄紙收納部，並且安裝有前述頭部單元及前述載台單元當中之其中一方的單元；以及列印機罩，係對於前述列印機本體以能夠轉動的方式連結，並安裝有前述頭部單元及前述載台單元當中之另一方。A printing unit in one form of the present invention comprises: a head unit having a thermal head for printing on recording paper; a stage unit having a stage roller for feeding the recording paper, and a pair of stage bearings for rotatably supporting the two ends of the stage roller, and the head unit is assembled in a separable manner; an operating lever capable of locking the head unit at a locking position and unlocking the stage unit. The head unit is configured to move around a rotation axis between a locked and unlocked position of the aforementioned stage unit; the stage locking mechanism has a locking arm that can swing around a swing axis parallel to the aforementioned stage roller, and can switch between a locked state for locking the aforementioned stage roller and an unlocked state for releasing the lock; and a push-up member that pushes the aforementioned locking arm around the aforementioned swing axis in a manner to maintain the aforementioned locked state; The head unit is formed with: a pair of receiving grooves, which can embed a pair of the aforementioned stage bearings into the interior through the opening, and when the aforementioned operating rod is located at the aforementioned locking position, the aforementioned stage bearings are received in a state of being connected to the bottom of the groove; the aforementioned locking arm is, when the aforementioned operating rod is located at the aforementioned locking position, pressing at least one of the pair of the aforementioned stage bearings received in the aforementioned receiving groove from the aforementioned opening side, and as the aforementioned operating rod is moved from the aforementioned locking position The locking position moves toward the unlocking position and swings around the swing axis, and allows the carrier bearing to be disengaged from the receiving groove through the opening. The locking arm is formed with: a push-up arm, which pushes the carrier bearing from the bottom of the groove toward the opening as the operating lever moves from the locking position to the unlocking position, and a push-up member, which pushes the locking arm toward the carrier unit. In addition, a printing unit of one form of the present invention is: the aforementioned locking arm, as the aforementioned operating rod moves from the aforementioned locking position to the aforementioned unlocking position, swings around the aforementioned swing axis from the aforementioned stage unit side to the aforementioned head unit side, and can allow the aforementioned stage bearing to be disengaged from the aforementioned receiving groove through the aforementioned opening. In addition, a printing unit of one form of the present invention is: the aforementioned push-up arm is non-contact with the aforementioned stage bearing when the aforementioned operating rod is in the aforementioned locking position. In addition, a printing unit of one form of the present invention is formed with an inclined guide protrusion on the inner side surface of the aforementioned receiving groove, the opening width of which narrows from the aforementioned opening side to the aforementioned groove bottom side, and guides the aforementioned stage bearing to the aforementioned groove bottom, and the aforementioned push-up arm pushes up the aforementioned stage bearing in a manner that the roller center of the aforementioned stage roller moves further toward the aforementioned opening side than the apex of the aforementioned guide protrusion. In addition, a printing unit of one form of the present invention is: the aforementioned locking arms are arranged on both sides of the aforementioned stage roller, and a pair of them are provided corresponding to a pair of the aforementioned stage bearings, and the aforementioned stage locking mechanism is provided with: a connecting shaft extending along the aforementioned swing axis and connecting the pair of the aforementioned locking arms to each other. In addition, a printing unit of one form of the present invention comprises: a fixed blade, which is arranged on one of the head unit and the stage unit; a movable blade, which is arranged on the other of the head unit and the stage unit and can move relative to the fixed blade; and a driving mechanism, which has a driving tooth connected to the movable blade and moves the movable blade between a standby position away from the fixed blade and a cutting position straddling the fixed blade. In addition, a printing unit of one form of the present invention is provided with: a return mechanism, which moves the movable blade from the cutting position to the standby position before the stage locking mechanism switches the stage roller to the unlocked state using the operating force accompanying the operation of the operating lever from the locking position to the unlocking position when the movable blade is stopped at the cutting position. In addition, a printing unit of one form of the present invention is: the aforementioned return mechanism is provided with: a return gear formed on the aforementioned drive gear; a return pinion engaged with the tooth of the aforementioned return gear; the return gear and the sun gear are arranged on the same axis as the aforementioned rotation axis of the aforementioned operating rod and supported in a manner capable of rotating around the aforementioned rotation axis; a planetary gear engaged with the aforementioned sun gear and revolving with the movement of the aforementioned operating rod; and an inner gear engaged with the aforementioned planetary gear; the aforementioned return gear is capable of engaging with the aforementioned return pinion. In addition, a printing unit of one form of the present invention is: the aforementioned tooth bar is formed on the opposite side of the tip of the movable blade in such a manner that the aforementioned tooth bar engages with the aforementioned return pinion when the movable blade is located at the aforementioned cutting position, and releases the engagement with the aforementioned return pinion when the movable blade is located at the aforementioned standby position. In addition, a printing unit of one form of the present invention is: the aforementioned locking arm has: a linear disengagement prevention surface, which prevents the aforementioned stage bearing from disengaging from the aforementioned receiving groove connected to the aforementioned opening in the aforementioned locking state, and a line passing through the center of the aforementioned stage bearing from the rotation center of the aforementioned locking arm is perpendicular to the aforementioned disengagement prevention surface. In addition, a printing unit of one form of the present invention is provided with: a stage support spring, which assists in keeping the stage bearing in the receiving groove; the stage support spring moves in a direction of releasing the holding of the stage bearing before the push-up arm pushes up the stage bearing as the operating lever moves from the locking position to the unlocking position, thereby allowing the stage bearing to be disengaged from the receiving groove connected to the opening. A thermal printer in one form of the present invention comprises: the aforementioned printing unit; a printer body having a recording paper storage portion for storing the aforementioned recording paper and having one of the aforementioned head unit and the aforementioned stage unit installed thereon; and a printer cover rotatably connected to the aforementioned printer body and having the other of the aforementioned head unit and the aforementioned stage unit installed thereon.

以下，參照所附圖式對本發明的一實施形態進行說明。如圖1及圖2所示，熱列印機1，係對於從捲筒紙狀的記錄紙P(感熱紙)進行印刷，並能夠將記錄紙P利用作為例如票券或收據等的列印機。 熱列印機1，係例如設置於店舖之店面，並藉由未圖示之資訊處理裝置控制動作。因此，熱列印機1，係控制為將從資訊處理裝置送訊而來的各種資訊印刷於記錄紙P，並將所印刷的記錄紙P排出。 熱列印機1，係例如設置於店面的設置面S，並將整體形成為方塊狀。於本實施形態中，在圖1及圖2所示之狀態，將對於設置面S垂直的方向稱為上下方向L1，將在對於設置面S平行的面內彼此正交的方向稱為前後方向L2及左右方向L3。又，前後方向L2當中，以箭號FW表示前方，以箭號BK表示後方。因此，於圖1及圖2中，對於紙面之左下側為前方FW，右上側為後方BK。 熱列印機1，係具備殼體(本發明之列印機本體)2、列印機罩3、由頭部單元5及載台單元6構成之列印單元4，並將記錄紙P往前方FW排出之所謂前出型。於圖示之例中，係於列印機罩3側設有載台單元6，並於殼體2側設有頭部單元5。然而，不限於該情形，例如於列印機罩3側設置頭部單元5，並於殼體2側設置載台單元6亦可。 殼體2，係藉由將合成樹脂材料、金屬材料或將該等適當組合，形成為於前方FW具有開口部之方塊狀，並具有包含對向於設置面S的底面11的複數個外面10。然而，殼體2的形狀限於該情形，適當改變亦可。 複數個外面10當中，將對於底面11在上下方向L1相向的外面稱為頂面12。並且，複數個外面10當中，位於前方FW側的外面稱為前面13，位於後方BK側的外面稱為後面14。該等前面13及後面14，係於前後方向L2相向。並且，複數個外面10當中，將於左右方向L3相向的外面稱為一對側面15。 於殼體2的內部，形成有：記錄紙收納部16，係能夠通過形成於殼體2的前面13的開口部收納輥狀的記錄紙P。藉此，在列印機罩3開啟時，能夠從前方FW將輥狀的記錄紙P放入記錄紙收納部16內。 列印機罩3，係經由旋轉軸部17連結於殼體2的前面13側的下部，將開口部以能夠開啟的方式閉塞。又，列印機罩3，係被連結為在繞旋轉軸部17之大致90度的角度範圍旋轉。如圖1所示，係設計為：在關閉列印機罩3之際，於該列印機罩3的前端與殼體2之間會有些許間隙。記錄紙P，係利用該間隙從殼體2的內部往前方FW被拉出而被排出。因此，該間隙係發揮作為記錄紙P的排出口18的功能。 如前述般構成之殼體2及列印機罩3，在關閉列印機罩3之際，隨著載台單元6與頭部單元5組合而鎖定。藉此，列印機罩3在閉狀態被鎖定。 並且，於殼體2，如圖1所示，在前面13與頂面12與其中一方之側面15交叉的角落部，設有：操作桿19，係用以解除載台單元6與頭部單元5的組合(鎖定)。藉此，如圖2所示般亦能夠解除列印機罩3的鎖定，而能夠進行列印機罩3的開啟操作。又，操作桿19，例如能夠往下方進行按下操作。 又，於列印機罩3，係設有作為例如電源按紐或送紙按紐的操作按鈕3a。操作按鈕3a，係在以能夠按下的方式露出的狀態配置於列印機罩3的外面。於圖示之例中，操作按鈕3a係以在操作桿19的下方於上下方向L1排成一列的方式配置。 如圖2至圖5所示，列印單元4，係具備：頭部單元5，係設於殼體2側；以及載台單元6，係設於列印機罩3側，並對於頭部單元5以能夠分離的方式組合。 頭部單元5，係具備：例如合成樹脂製的頭部框架20，係形成該頭部單元5的基本骨架；例如金屬製的頭部罩板21，係以從前方FW及左右方向L3覆蓋頭部框架20的方式組合於頭部框架20；以及例如金屬製的齒輪罩22、23，係以從左右方向L3覆蓋頭部框架20的方式組合於頭部框架20。 並且，頭部單元5，係至少具備熱感頭25、可動刀刃26、驅動機構27、操作桿28、回歸機構29及載台鎖定機構30。該等熱感頭25、可動刀刃26、驅動機構27、操作桿28、回歸機構29及載台鎖定機構30，係主要利用頭部框架20進行安裝，並被頭部罩板21及齒輪罩22、23覆蓋。 如前述般構成之頭部單元5，係安裝於殼體2的內部。具體而言，頭部單元5，係配置於記錄紙收納部16的上方且靠近殼體2的前面13，並主要藉由頭部框架20的螺絲鎖緊安裝於殼體2。於本實施形態中，頭部單元5係以使可動刀刃26的刀尖26a朝向下方的方式安裝。又，針對頭部單元5，係於之後詳細說明。 載台單元6，係具備：例如合成樹脂製的載台框架40，係形成該載台單元6的基本骨架；以及例如金屬製的載台罩板41，係以從前方FW及左右方向L3覆蓋載台框架40的方式組合於載台框架40。並且載台單元6，係至少具備載台滾輪45及固定刀刃46。該等載台滾輪45及固定刀刃46，係主要利用載台框架40安裝，並被載台罩板41覆蓋。 如前述般構成之載台單元6，係主要經由載台罩板41安裝於列印機罩3的內面。此時，載台單元6，係安裝於以能夠伴隨列印機罩3的開閉動作從頭部單元5分離的方式被組合的位置。於本實施形態中，載台單元6係以使固定刀刃46的刀尖46a朝向上方的方式安裝。 針對載台單元6進行詳細說明。如圖3至圖6所示，固定刀刃46，係在組合頭部單元5與載台單元6之際，以使刀尖46a朝向頭部單元5側的方式被載台框架40支承。如圖6所示，於載台框架40，係在位於比固定刀刃46更後方BK的部分形成有收納載台滾輪45的載台收納空間47，並且形成有以隔著載台收納空間47於左右方向L3相向的方式配置並支承載台滾輪45的支承壁48。 載台滾輪45，係將記錄紙P往列印機罩3的外部搬運的橡膠滾輪，且於往左右方向L3延伸的載台軸50形成有橡膠層。載台滾輪45，係在外周面的一部分於頭部單元5側露出的狀態下被收納於載台收納空間47內，並且被支承壁48以能夠旋轉的方式支承。具體而言，於比載台滾輪45更延伸至左右方向L3的外側之載台軸50的兩端部，分別覆蓋有圓筒狀的載台軸承51。藉此，即便按壓一對載台軸承51，亦能夠使載台滾輪45旋轉。又，於載台軸50的其中一端部，在比載台軸承51更靠左右方向L3的外側固定有從動齒輪52。 支承壁48，係利用例如狹縫孔夾住載台軸承51而固定。藉此，載台滾輪45，係在收納於載台收納空間47內的狀態下透過一對載台軸承51被一對支承壁48以能夠旋轉的方式支承。一對載台軸承51，係比支承壁48更往左右方向L3的外側延伸，並在關閉列印機罩3之際如圖5般，分別被收容於設在頭部單元5側的一對收容溝62內。 又，於圖5中，係於載台單元6當中主要針對載台滾輪45及載台軸承51進行圖示。 接著，針對頭部單元5詳細說明。如圖3至圖5所示，頭部單元5，係至少具備熱感頭25、可動刀刃26、驅動機構27、操作桿28、回歸機構29及載台鎖定機構30。 如圖5所示，熱感頭25，係具有沿著左右方向L3以線狀排列的複數個未圖示之發熱元件，並以在列印機罩3位於關閉位置時對向於載台滾輪45的方式安裝於頭部框架20。又，記錄紙P，係能夠通過載台滾輪45與熱感頭25之間。於熱感頭25與頭部框架20之間，中介有將熱感頭25往載台滾輪45側推彈之未圖示的線圈彈簧。藉此，能夠藉由載台滾輪45將熱感頭25按壓於被送出的記錄紙P，而能夠藉由列印單元4良好地進行印刷。 頭部框架20，係具有：一對側壁部60、61，係位於比載台單元6之載台框架40的支承壁48更位於左右方向L3的外側。於一對側壁部60、61，係分別形成有能夠將一對載台軸承51個別嵌入至內部的一對收容溝62。收容溝62，係如圖7所示形成為側視U字形，並在使開放口62a朝向往載台單元6側的前方FW的狀態形成。收容溝62之溝底部62b，係形成為平坦。又，圖7係圖示形成於其中一方的側壁部60的收容溝62，並適當省略其他各構成品的圖示。 於收容溝62的內側面，形成有：傾斜的引導突起63，係開口寬度從開放口62a側往溝底部62b側縮窄，且將載台軸承51往溝底部62b側引導。藉此，收容溝62，係以使開放口62a的開口寬度最大的方式形成，並且以使開口寬度在引導突起63之頂點部63a附近最小的方式形成。藉由於收容溝62形成引導突起63，能夠將載台軸承51以沿著引導突起63落入溝底部62b側的方式進行引導。 因如前述般於一對側壁部60、61分別形成有收容溝62，故在組合頭部單元5與載台單元6之際，如圖5及圖7所示，一對載台軸承51會成為嵌入至一對收容溝62內而被收容於內部的狀態。此時，載台軸承51，係在相接於溝底部62b的狀態被收容於收容溝62內。 如圖4所示，可動刀刃26，係在組合頭部單元5與載台單元6之際，以使刀尖26a朝向載台單元6側的方式透過驅動機構27被安裝於頭部框架20。此時，可動刀刃26係以對於固定刀刃46於上下方向L1相向的方式配置，並且以在移動至切斷位置P1時對於固定刀刃46在前後方向L2重疊的方式配置。可動刀刃26，係如圖8所示，形成為自根部至刀尖26a的長度從兩端朝向中央逐漸變短之V字形的板狀刀刃。又，圖8係表示使可動刀刃26移動至切斷位置P1，而在固定刀刃46與可動刀刃26之間切斷記錄紙P的狀態的立體圖。 如圖4所示，可動刀刃26，係透過可動刀刃夾具70安裝於驅動機構27的驅動齒條71。可動刀刃26，係構成為能夠藉由驅動機構27的運作而對於頭部框架20在上下方向L1移動。藉此，可動刀刃26，係以能夠對於固定刀刃46往上下方向L1移動的方式被支承。 如圖4、圖9及圖10所示，驅動機構27，係使可動刀刃26移動至切斷位置P1及待命位置P2的機構。所謂切斷位置P1，係可動刀刃26跨上固定刀刃46，而可動刀刃26與固定刀刃46一起將記錄紙P切斷的位置(參照圖8)。所謂待命位置P2，係可動刀刃26恰當地遠離固定刀刃46的位置(參照圖4)。驅動機構27，係具備驅動用馬達75、驅動中間車76、二段中間車77、驅動小齒輪78及驅動齒條71。 如圖10所示，驅動用馬達75係能夠正逆旋轉可能的馬達，並被固定於頭部框架20之其中一方的側壁部60的內側。驅動用馬達75的驅動軸，係連接至減速機構75a。並且，減速機構75a的輸出軸75b，係比頭部框架20之其中一方的側壁部60更往左右方向L3的外側突出。驅動中間車76，係配置於比其中一方的側壁部60更靠左右方向L3的外側，並連結至減速機構75a的輸出軸75b。因此，驅動中間車76，係伴隨透過減速機構75a之驅動用馬達75的旋轉進行旋轉。 如圖9及圖10所示，二段中間車77，係配置於驅動中間車76與驅動小齒輪78之間，並被中間支承軸80以能夠旋轉的方式支承。二段中間車77，係具備大徑中間車77a，及形成為比大徑中間車77a更小徑之小徑中間車77b。大徑中間車77a，係在操作桿28位於鎖定位置P3之際，嚙合於驅動中間車76。藉此，二段中間車77的整體係伴隨驅動中間車76的旋轉進行旋轉。又，小徑中間車77b，係配置於比大徑中間車77a更靠左右方向L3的外側，並對於驅動小齒輪78嚙合。 驅動小齒輪78，係以比小徑中間車77b更位於操作桿28側且位於驅動齒條71側的方式配置，並且在對於小齒輪支承軸81配置在同軸的狀態下固定於該小齒輪支承軸81。藉此，驅動小齒輪78及小齒輪支承軸81，係一體地旋轉。並且，驅動小齒輪78係嚙合於小徑中間車77b，並且嚙合於驅動齒條71之驅動齒條齒71a。 驅動齒條71，係如圖4所示，不僅是頭部框架20之其中一方的側壁部60側，亦配置於另一方的側壁部61側，而隔著頭部框架20配置於左右方向L3的兩側。並且，小齒輪支承軸81，係以於左右方向L3貫穿頭部框架20的方式形成，並且將配置在左右方向L3的兩側之一對驅動小齒輪78彼此連結。藉此，一對驅動小齒輪78，係能夠透過小齒輪支承軸81在同步的狀態下一起轉動。 驅動齒條71，係沿著可動刀刃夾具70的左右方向L3安裝於兩端部，並沿著上下方向L1延伸。藉此，驅動齒條71係透過可動刀刃夾具70對於可動刀刃26組合。驅動齒條71，係涵蓋整個區域形成有驅動齒條齒71a。一對驅動小齒輪78，係對於該驅動齒條齒71a嚙合。因此，伴隨一對驅動小齒輪78的旋轉，能夠透過驅動齒條71使可動刀刃26在待命位置P2與切斷位置P1之間移動。 以下，為容易理解構成，針對位於其中一方之側壁部60側(驅動用馬達75側)的驅動小齒輪78及驅動齒條71進行詳細說明，並省略另一方之側壁部61側之驅動小齒輪78及驅動齒條71的說明。 因如前述般構成驅動機構27，故如圖4及圖9所示，能夠藉由驅動用馬達75的旋轉經由驅動中間車76及二段中間車77(大徑中間車77a及小徑中間車77b)使驅動小齒輪78旋轉。因此，能夠使驅動齒條71與回歸機構29的後述之回歸齒條130一起往箭號F1方向移動，而能夠使可動刀刃26往相同方向移動。藉此，能夠使可動刀刃26從待命位置P2移動至切斷位置P1。 另一方面，藉由使驅動用馬達75逆旋轉，能夠經由驅動中間車76及二段中間車77使驅動小齒輪78逆旋轉。因此，能夠使驅動齒條71與回歸齒條130一起往箭號F2方向移動，而能夠使可動刀刃26往相同方向移動。藉此，能夠使可動刀刃26從切斷位置P1移動至待命位置P2而回歸。 然而，支承前述之二段中間車77的中間支承軸80，係固定於配置為能夠以小齒輪支承軸81作為中心進行擺動的擺動板90。如圖7、圖9～圖11所示，於擺動板90，形成有於左右方向L3貫穿該擺動板90並且使小齒輪支承軸81插通的插通孔91。擺動板90，係配置為能夠在使小齒輪支承軸81插通於插通孔91內的狀態下沿著其中一方的側壁部60的壁面擺動。 擺動板90，係具備：第1板部92，係從插通孔91往驅動中間車76與驅動齒條71之間延伸；以及第2板部93，係從插通孔91往後述之鎖定臂140的擺動軸線O2延伸。 中間支承軸80，形成為從第1板部92往左右方向L3的外側延伸。藉此，中間支承軸80所支承的二段中間車77，係能夠伴隨擺動板90以小齒輪支承軸81為中心擺動。於第2板部93，係以往左右方向L3的外側突出的方式形成有卡止突起94及卡合銷95。 如此構成之擺動板90，係藉由第1推彈構件100所造成之推彈力，使二段中間車77的大徑中間車77a持續被往對於驅動中間車76嚙合的方向推彈。第1推彈構件100，係具有：線圈部100a，係例如為線圈彈簧，並被突出設置於其中一方之側壁部60的線圈支承軸105支承；第1線圈端部100b，係卡止於頭部框架20；第2線圈端部100c，係卡止於擺動板90的卡止突起94。 藉此，擺動板90，係藉由第1推彈構件100之推彈力(彈性回復力)使第2板部93被往操作桿28側推彈，故大徑中間車77a會在被按壓於於驅動中間車76的狀態下被定位。又，第1推彈構件100不限於線圈彈簧，例如為板簧等亦可。 並且，擺動板90，係構成為伴隨於操作桿28的操作，使卡合銷95被後述之推起凸輪113推起，藉此抵抗第1推彈構件100的推彈力而以小齒輪支承軸81為中心擺動，而使二段中間車77遠離驅動中間車76。藉此，能夠解除二段中間車77與驅動中間車76的嚙合。 如圖4、圖9及圖10所示，操作桿28，係配置於頭部框架20之其中一方的側壁部60側，並且透過操作桿支承軸106被支承為能夠旋轉。操作桿28，係構成為能夠以操作桿支承軸106為中心鎖定位置P3朝向後述之嚙合解除位置P4或解除鎖定位置P5將其中一方之側壁部60往從左右方向L3的外側觀察在側視下之逆時針方向進行壓入操作。 操作桿支承軸106，係如圖11所示般從齒輪罩22的內面往其中一方之側壁部60側突出設置。又，操作桿支承軸106的中心軸線為操作桿28的旋轉軸線O1。 所謂鎖定位置P3，係指載台單元6對於頭部單元5保持在鎖定狀態的位置。所謂嚙合解除位置P4，係指藉由操作桿28之後述之推起凸輪113使擺動板90擺動，而使二段中間車77的大徑中間車77a與驅動中間車76之嚙合解除的位置。所謂解除鎖定位置P5，係指載台單元6對於頭部單元5的鎖定狀態的解除了的位置。 如圖9至圖11所示，於操作桿28的基端部，形成有：操作桿板110，係形成為側視扇狀。於操作桿板110的外面，往左右方向L3的外側突出設置有行星軸111。於操作桿板110的內面，形成又卡合於後述之鎖定臂140的操作桿突部112。並且，於操作桿板110，形成有往徑方向外側膨起的推起凸輪113以及限制突片114。 行星軸111，係形成於偏離操作桿支承軸106的位置。推起凸輪113，係配置於比形成在擺動板90的卡合銷95更靠順時針方向側，且在操作桿28從鎖定位置P3往解除鎖定位置P5側旋轉時，能夠對於卡合銷95接觸。並且，於推起凸輪113的外面，形成有往左右方向L3的外側突出設置的卡止突起115。 限制突片114，係配置於比推起凸輪113更靠逆時針方向側，並在操作桿28位於鎖定位置P3時，對於形成在頭部框架20的限制壁部116從順時針方向側接觸。因此，操作桿28的整體會受到限制而無法進一步往順時針方向旋轉，藉此定位於鎖定位置P3。又，操作桿28，在移動至解除鎖定位置P5並且被往後方進行按壓移動操作時，係能夠對於圖3及圖11所示之齒輪罩22的限制壁部117從逆時針方向側接觸。因此，操作桿28會受到限制而無法超過解除鎖定位置P5並進一步被大幅按下操作。 操作桿28的前端部，係嵌合於設在殼體2的操作桿19的連結體19a(參照圖2)的內側。因此，操作桿28，係連動於操作桿19的操作而被操作。藉此，藉由對於操作桿19進行操作，能夠連動於此使操作桿28從鎖定位置P3往解除鎖定位置P5進行操作。 如前述般構成之操作桿28，係如圖9及圖10所示，藉由第2推彈構件120所造成之推彈力被持續向前往鎖定位置P3的方向(順時針方向)推彈。第2推彈構件120，係具有：線圈部120a，係例如為線圈彈簧，並被突出設置於齒輪罩22的內面之未圖示的線圈支承軸支承；第1線圈端部120b，係卡止於齒輪罩22的內面；第2線圈端部120c，係卡止於操作桿28的卡止突起115。 藉此，操作桿28，係藉由第2推彈構件120的推彈力(彈性回復力)被往順時針方向推彈，故操作桿28的前端部會被向前往鎖定位置P3的方向推彈。又，如先前所述，因操作桿28的限制突片114係對於頭部框架20的限制壁部116接觸，故限制以使之無法進一步旋轉，而定位於鎖定位置P3。又，第2推彈構件120不限於線圈彈簧，例如為板簧等亦可。 如圖4所示，回歸機構29，係在例如藉由夾紙的發生等使可動刀刃26於切斷位置P1停止的狀態下，在載台鎖定機構30利用施加於從鎖定位置P3前往解除鎖定位置P5的操作桿28的操作力(旋轉力)將載台滾輪45切換為解除鎖定狀態之前，使可動刀刃26從切斷位置P1往待命位置P2移動的機構。 如圖9至圖12所示，回歸機構29，係具備：回歸齒條130，係形成於驅動齒條71；回歸小齒輪131，係嚙合於回歸齒條130的齒條齒130a；回歸齒輪132及太陽齒輪133，係被支承為在配置為與操作桿28的旋轉軸線O1同軸的狀態下能夠繞旋轉軸線O1旋轉；行星齒輪134，係嚙合於太陽齒輪133並且伴隨著操作桿28的移動進行公轉；以及內齒輪135，係嚙合於行星齒輪134。又，太陽齒輪133、行星齒輪134及內齒輪135，係構成增速機構136(參照圖12)。 又，於本實施形態中，雖係以將回歸齒輪132及太陽齒輪133構成為一個構件的情形為例，而不限於該情形。例如，只要能夠使回歸齒輪132與太陽齒輪133一體旋轉(能夠一起旋轉)，將回歸齒輪132及太陽齒輪133個別形成並組合亦可。 回歸小齒輪131，係在配置於比驅動小齒輪78更靠左右方向L3的外側的狀態下，被小齒輪支承軸81支承為能夠旋轉。藉此，回歸小齒輪131配置於與驅動小齒輪78為同軸上。又，回歸小齒輪131，係能夠與連動於操作桿28的操作進行旋轉的回歸齒輪132嚙合，並藉由來自回歸齒輪132的旋轉力進行旋轉。並且，回歸小齒輪131，係能夠嚙合於回歸齒條130之齒條齒130a。 回歸齒條130，係如圖9及圖10所示，在配置於比驅動機構27之驅動齒條71更靠左右方向L3的外側的狀態下，一體形成於驅動齒條71。回歸齒條130，係具有複數個齒條齒130a。該等複數個齒條齒130a，係以位於可動刀刃26的根部側而非刀尖26a側的方式形成。藉此，回歸齒條130，係在可動刀刃26位於切斷位置P1時與回歸小齒輪131嚙合，且在可動刀刃26位於待命位置P2時解除與回歸小齒輪131的嚙合。 又，於圖示之例中，雖係將驅動齒條71與回歸齒條130形成為一體，然而不限於該情形，將回歸齒條130形成為與驅動齒條71為不同個體亦可。然而，藉由將驅動齒條71與回歸齒條130形成為一體，能夠不增加零件數便具備回歸齒條130，故能夠達成構成簡略化以及成本降低化，故較佳。 複數個齒條齒130a當中，位於可動刀刃26的刀尖26a側的齒條齒130a，係能夠位移的齒條齒130b。該齒條齒130b，係形成於齒條臂139的前端部。齒條臂139的基端部，係連結至驅動齒條71當中位於可動刀刃26的刀尖26a側的端部。因此，齒條臂139，係能夠以基端部為支點往遠離回歸小齒輪131的方向彈性變形之懸臂。藉此，能夠使齒條臂139往遠離回歸小齒輪131的方向彈性變形，並能夠使齒條齒130b往回歸小齒輪131的徑方向外側退避。 簡單說明將回歸齒條130的齒條齒130b形成為能夠往回歸小齒輪131的徑方向外側退避的理由。例如，在回歸齒條130往圖9所示之箭號F1方向移動之際，可能會有回歸齒條130的齒條齒130b抵接於回歸小齒輪131之齒部的齒頂的情形。在此情形，會有回歸齒條130的移動被回歸小齒輪131的齒頂阻止。考慮如此情形，係藉由將齒條齒130b形成於齒條臂139的前端部，構成為藉由齒條臂139的彈性變形使齒條齒130b往回歸小齒輪131的徑方向外側退避，而能夠越過回歸小齒輪131的齒頂。因此，在齒條齒130b越過回歸小齒輪131的齒頂之後，利用齒條臂139的彈性回復力使齒條齒130b回歸到原來的位置，而使回歸了的齒條齒130b能夠恰當地嚙合於回歸小齒輪131之下個齒部。藉此，不致發生回歸齒條130的移動被阻礙之問題，而能夠使回歸齒條130的齒條齒130b與回歸小齒輪131恰當地嚙合。 如圖9及圖10所示，回歸齒輪132，係在配置於比操作桿28之操作桿板110更靠左右方向L3的外側的狀態下，被操作桿支承軸106支承為能夠旋轉。藉此，回歸齒輪132配置於與操作桿28的旋轉軸線O1為同軸上。 回歸齒輪132，係具備齒輪托板132a、沿著齒輪托板132a的外周緣形成的複數個齒輪齒部132b。複數個齒輪齒部132b，係並非涵蓋齒輪托板132a的全周，而是在涵蓋大至半周的範圍形成。該等複數個齒輪齒部132b，係能夠對於回歸小齒輪131嚙合。 藉由將操作桿28從鎖定位置P3往解除鎖定位置P5操作，複數個齒輪齒部132b當中，最先對於回歸小齒輪131嚙合的齒輪齒部132b，能夠往回歸齒輪132的徑方向內側位移，而能夠自回歸小齒輪131的齒部退避。 齒輪齒部132b，係形成於彈性臂部132c的前端部。彈性臂部132c，係基端部一體形成於齒輪托板132a的外周緣當中未形成齒輪齒部132b的部分，並沿著齒輪托板132a的外周緣往順時針方向以圓弧狀延伸。藉此，彈性臂部132c，係透過基端部被懸臂支承於齒輪托板132a的外周緣，並且能夠以基端部為支點往徑方向彈性變形。藉此，彈性臂部132c往齒輪托板132a側彈性變形，藉此能夠使齒輪齒部132b往回歸齒輪132的徑方向內側位移，而能夠從回歸小齒輪131的齒部退避。 如圖12所示，太陽齒輪133係於齒輪托板132a的內面一體形成，配置於與操作桿28的旋轉軸線O1為同軸上。藉此，太陽齒輪133係能夠與回歸齒輪132一起繞旋轉軸線O1旋轉。 行星齒輪134，係在嚙合於太陽齒輪133的狀態下，透過行星軸111被操作桿28以能夠旋轉的方式支承。藉此，操作桿28繞旋轉軸線O1旋轉，藉此行星齒輪134會追隨於操作桿28的移動以旋轉軸線O1為中心公轉。於齒輪罩22的內面，形成有行星齒輪134所嚙合之內齒輪135。因此，行星齒輪134，係伴隨於操作桿28的移動進行公轉，藉此能夠一邊嚙合於內齒輪135一邊自轉。 行星齒輪134如此自轉，藉此能夠使太陽齒輪133及回歸齒輪132繞旋轉軸線O1旋轉，並且能夠使回歸齒輪132的齒輪齒部132b對於回歸小齒輪131嚙合。 如圖5所示，載台鎖定機構30，係具有能夠繞與載台滾輪45平行的擺動軸線O2擺動的鎖定臂140、150，並能夠切換為鎖定載台滾輪45的鎖定狀態及解除該鎖定的解除鎖定狀態的機構。 圖5、圖9及圖10所示，其中一方的鎖定臂140係配置於頭部框架20之其中一方的側壁部60側，另一方的鎖定臂150係配置於另一方的側壁部61側。該等一對鎖定臂140、150，係在操作桿28位於鎖定位置P3時，從開放口62a側按壓被收容於收容溝62內的載台軸承51，且伴隨著操作桿28從鎖定位置P3往解除鎖定位置P5側的移動，從載台單元6往頭部單元5側繞擺動軸線O2擺動，並容許載台軸承51遠離載台軸承51而從收容溝62內脫離。 因此，本實施形態之載台鎖定機構30，係利用一對鎖定臂140、150，能夠同時鎖定一對載台軸承51，並且能夠同時解除鎖定。 其中一方之鎖定臂140及另一方之鎖定臂150，係透過沿著左右方向L3延伸之長條的連結軸部141連結。連結軸部141，係如圖10所示之圓柱狀的軸(shaft)，以於左右方向L3貫穿頭部框架20的方式形成，並被其中一方的側壁部60及另一方的側壁部61以能夠旋轉的方式支承。又，連結軸部141的中心軸線係擺動軸線O2。 並且，其中一方之鎖定臂140及另一方之鎖定臂150，係分別連結於連結軸部141的兩端部。藉此，其中一方之鎖定臂140及另一方之鎖定臂150，係能夠在同步的狀態下透過連結軸部141繞擺動軸線O2擺動。 又，連結軸部141，係配置為在上下方向L1位於收容溝62與回歸齒輪132之間，且在前後方向L2比收容溝62更位於後方BK。 又，於本實施形態中，雖以將配置於左右方向L3之一對鎖定臂140、150彼此透過連結軸部141以能夠擺動的方式連結的情形為例，然而不限於該情形。例如，將一對鎖定臂140、150及連結軸部141以折彎1枚板金等而一體形成，藉此構成為一個構件亦可。 針對其中一方之鎖定臂140詳細說明。如圖13所示，鎖定臂14，係配置於比收容溝62更上方側，並以往前後方向L2延伸的方式形成。鎖定臂140的基端部係連結至連結軸部141的端部。於鎖定臂140的前端部，形成有：鎖定爪部145，係從收容溝62之開放口62a側覆蓋收容於收容溝62內的載台軸承51。藉此，能夠以使載台軸承51夾在鎖定爪部145與收容溝62之溝底部62b之間的方式保持載台軸承51。 又，鎖定爪部145的外側面，係在將載台軸承51安置於收容溝62內之際，將載台軸承51引導至收容溝62內之傾斜的引導面145b。該引導面145b，係以在與收容溝62側的引導突起63之間區劃形成側視下為V字形的V溝的方式形成。 並且，於鎖定臂140的基端部，形成有往左右方向L3的外側突出設置的卡合壁部146。卡合壁部146，係在將操作桿28從鎖定位置P3往解除鎖定位置P5操作之際，推起凸輪113透過卡合銷95使擺動板90擺動之後，操作桿28的操作桿突部112所接觸的壁部。 藉此，鎖定臂140之全體，係構成為伴隨於操作桿28的操作透過卡合壁部146從操作桿突部112被按壓，並以擺動軸線O2為中心往順時針方向擺動。亦即，鎖定臂140，係構成為以從載台單元6側前往頭部單元5側的方式，以擺動軸線O2為中心往上方擺動。因此，鎖定臂140的鎖定爪部145，係伴隨於操作桿28的操作逐漸遠離載台軸承51，並在操作桿28到達解除鎖定位置P5時，從收容溝62往頭部單元5側退避而使開放口62a開放。藉此，能夠容許載台軸承51從收容溝62內脫離。 並且，於鎖定臂140，形成有：推起臂147，係隨著操作桿28從鎖定位置P3往解除鎖定位置P5移動，使載台軸承51從收容溝62的溝底部62b往開放口62a側移動。推起臂147，係配置於比溝底部62b更後方BK側，並以從鎖定臂140、150往下方延伸的方式形成。推起臂147當中，朝向載台軸承51側的面，係以對於溝底部62b平行延伸的方式形成之推起載台軸承51的推動面147a。 又，在操作桿28位於鎖定位置P3的情形，能夠確保於推動面147a與載台軸承51之間有間隙。藉此，前述推起臂147，在操作桿28位於鎖定位置P3之際，以對於載台軸承51為非接觸的方式待命。 特別是，因推起臂147係形成為往下方較長，故在收容溝62內將載台軸承51推起之際，能夠將載台軸承51往開放口62a大幅推起。具體而言，係以使載台滾輪45的滾輪中心比形成於收容溝62的引導突起63的頂點部63a更往開放口62a側移動的方式將載台軸承51推起。 如前述般構成之鎖定臂140，係承受推彈配置於頭部框架20之另一方之側壁部61側的另一方之鎖定臂150(參照圖5)的推彈力，往朝向載台單元6側的逆時針方向被推彈。藉此，鎖定臂140，係以成為使鎖定爪部145從開放口62a側覆蓋載台軸承51的姿勢之方式被隨時推彈。 接著，參照圖14，針對另一方之鎖定臂150進行說明。然而，另一方之鎖定臂150，因基本上與鎖定臂140為相同構成，故針對相同構成係賦予相同符號，並省略其說明。 如圖14所示，於另一方之鎖定臂150形成有往左右方向L3的外側突出設置的卡止突起151。並且，鎖定臂150，係藉由第3推彈構件(本發明之推彈構件)160所造成之推彈力，以成為使鎖定爪部145從開放口62a側覆蓋載台軸承51的姿勢之方式被隨時推彈。 第3推彈構件160，係具有：線圈部160a，係例如為線圈彈簧，並被突出設置於另一方之齒輪罩23的內面之未圖示的線圈支承軸支承；第1線圈端部160b，係卡止於頭部框架20；第2線圈端部160c，係卡止於鎖定臂150的卡止突起151。 藉此，鎖定臂150，會藉由第3推彈構件160的推彈力(彈性回復力)在圖14所示之狀態下被往順時針方向推彈。藉此，另一方之鎖定臂140，會在圖13所示之狀態下被往逆時針方向推彈。又，第3推彈構件160不限於線圈彈簧，例如為板簧等亦可。 又，本實施形態之載台單元6，係如圖5所示，在組合於頭部單元5之際，從動齒輪52配置於比另一方之鎖定臂150更靠左右方向L3的外側。從動齒輪52，係能夠嚙合於配置在頭部框架20之另一方之側壁部61側的未圖示之載台齒輪系機構。載台齒輪系機構，係發揮承受來自用以驅動載台滾輪45之未圖示的驅動用馬達的動力而作動，並將該動力傳達至從動齒輪52的功能。藉此，在組合頭部單元5與載台單元6之際，能夠使載台滾輪45旋轉而進行記錄紙P的送紙。 接著，針對前述般所構成之熱列印機1的作用進行說明。首先，針對組合頭部單元5與載台單元6的情形進行說明。在此情形，係如圖2所示，在將輥狀的記錄紙P放入殼體2的記錄紙收納部16內並安置之後，關閉操作列印機罩3，藉此能夠使載台單元6對於頭部單元5接近。並且，如圖1所示，藉由使列印機罩3完全關閉，能夠在將記錄紙P夾在熱感頭25與載台滾輪45之間的狀態下組合頭部單元5與載台單元6。 又，伴隨於關閉操作列印機罩3，載台滾輪45的載台軸承51會一邊被收容溝62的引導突起63及鎖定爪部145的引導面145b引導一邊以嵌入至收容溝62內的方式被引導，而被收容於收容溝62內。此時，載台軸承51，係一邊抵抗第3推彈構件160的推彈力將鎖定爪部145推開少許，一邊嵌入至收容溝62內。 鎖定臂140、150，在被載台軸承51推壓之後，藉由第3推彈構件160的推彈力繞擺動軸線O2擺動而回歸到原本的位置，並利用鎖定爪部145從收容溝62的開放口62a側按壓載台軸承51。藉此，如圖5所示，係能夠利用一對鎖定臂140、150，分別按壓收容於一對收容溝62內的一對載台軸承51，故能夠防止載台軸承51從收容溝62內脫離。因此，能夠利用載台鎖定機構30，將載台滾輪45維持在鎖定狀態。 藉此，能夠鎖定頭部單元5與載台單元6之組合，同時亦能夠進行列印機罩3對於殼體2的鎖定。又，藉由組合頭部單元5與載台單元6，使熱感頭25與載台滾輪45在其間夾有記錄紙P的狀態下以預定的壓力壓接。並且，記錄紙P，係成為在通過可動刀刃26與固定刀刃46之間之後，從排出口18被拉出至殼體2的外側的狀態。並且，載台滾輪45的從動齒輪52，係成為嚙合於頭部單元5側的載台齒輪系機構的狀態。 接著，就對於記錄紙P進行各種資訊的印刷的情形簡單地進行說明。於該情形，係使驅動用馬達驅動，透過載台齒輪系機構使從動齒輪52旋轉。藉此，能夠使載台滾輪45旋轉，並能夠使被夾在與熱感頭25之間的記錄紙P往排出口18送紙。並且，與此同時對於熱感頭25輸出對應於列印資料的控制訊號並使發熱元件適當發熱。藉此，對於被送紙之記錄紙P，能夠鮮明地印刷各種文字、圖形等。又，所印刷之記錄紙P係通過固定刀刃46與可動刀刃26之間。 接著，針對切斷記錄紙P的情形簡單地說明。於該情形，係使驅動用馬達75驅動使圖9所示之驅動中間車76旋轉。藉此，能夠透過二段中間車77(大徑中間車77a及小徑中間車77b)使驅動小齒輪78旋轉，而能夠使驅動齒條71與回歸齒條130一起往箭號F1方向移動。藉此，能夠使可動刀刃26從待命位置P2移動至切斷位置P1，並能夠如圖8所示般將記錄紙P夾在與固定刀刃46之間而切斷。因此，能夠將切斷了的記錄紙P使用作為例如收據或票券等。 又，切斷記錄紙P之後，使驅動用馬達75逆旋轉。藉此，能夠透過驅動中間車76及二段中間車77使驅動小齒輪78逆旋轉，而如圖9所示，能夠使驅動齒條71與回歸齒條130一起往箭號F2方向移動。因此，能夠使可動刀刃26從切斷位置P1移動至待命位置P2而回歸。 並且，在切斷記錄紙P之際，回歸小齒輪131，係成為解除與回歸齒輪132之齒輪齒部132b嚙合的狀態，而容許空轉。因此，在可動刀刃26往切斷位置P1移動時，即便為回歸齒條130的齒條齒130a、130b嚙合於回歸小齒輪131的情形，亦能夠使回歸小齒輪131空轉。因此，不致受回歸小齒輪131影響，能夠使驅動齒條71及回歸齒條130移動，而能夠切斷記錄紙P。 接著，針對在可動刀刃26與固定刀刃46之間發生夾紙的情形，係藉由對於操作桿28進行操作，一邊進行夾紙的解除，一邊進行載台單元6的解除鎖定，而使列印機罩3開放的情形之一連串的動作進行說明。又，在切斷記錄紙P當中發生夾紙的情形，係如圖15所示，成為停止於可動刀刃26跨上固定刀刃46的切斷位置P1的狀態。 在該情形，係如圖15所示，抵抗第2推彈構件120的推彈力，將操作桿28從鎖定位置P3往解除鎖定位置P5側操作。藉此，能夠以旋轉軸線O1為中心使操作桿28以往逆時針方向旋轉的方式移動，並能夠伴隨操作桿28的移動，使嚙合於內齒輪135的行星齒輪134一邊以行星軸111為中心往順時針方向自轉一邊以旋轉軸線O1為中心往逆時針方向公轉。並且，伴隨行星齒輪134的旋轉，能夠使太陽齒輪133及回歸齒輪132以旋轉軸線O1為中心往逆時針方向旋轉。 操作桿28往逆時針方向旋轉，藉此如圖16所示，推起凸輪113係對於卡合銷95接觸，而透過卡合銷95對於擺動板90施加外力。因此，藉由進一步對於操作桿28進行操作，係如圖17所示，能夠藉由推起凸輪113將擺動板90推起，而能夠抵抗第1推彈構件100的推彈力，使擺動板90以小齒輪支承軸81為中心往順時針方向擺動。 藉此，能夠使安裝於擺動板90的二段中間車77自驅動中間車76分離，而能夠解除二段中間車77與驅動中間車76的嚙合。因此，此時之操作桿28的位置係相當於嚙合解除位置P4。 並且，與擺動板90擺動的同時，太陽齒輪133及回歸齒輪132會伴隨於操作桿28的操作往逆時針方向旋轉，故如圖17所示，能夠在二段中間車77與驅動中間車76的嚙合解除了的時機，使回歸齒輪132之最初地齒輪齒部132b嚙合於回歸小齒輪131。藉此，能夠使回歸小齒輪131往順時針方向旋轉。 因此，藉由將操作桿28進一步從圖17所示之嚙合解除位置P4往解除鎖定位置P5側操作，能夠如圖18及圖19所示般使回歸齒輪132之其餘的齒輪齒部132b依序嚙合於回歸小齒輪131，而能夠使回歸小齒輪131持續地往順時針方向旋轉。因此，能夠使嚙合於回歸小齒輪131的回歸齒條130往箭號F2方向移動，而能夠使可動刀刃26從切斷位置P1強制地回歸至待命位置P2。藉此，能夠消除可動刀刃26對於固定刀刃46重疊的狀態，而能夠解除夾紙。 又，在利用回歸小齒輪131使可動刀刃26回歸至待命位置P2之際，驅動齒條71亦會與回歸齒條130一起移動，故驅動小齒輪78會旋轉。此時，如先前所述，二段中間車77與驅動中間車76的嚙合會解除，故能夠使驅動小齒輪78及嚙合於此之二段中間車77分別空轉。因此，能夠不受驅動小齒輪78及二段中間車77影響，使可動刀刃26回歸至待命位置P2。 又，藉由使可動刀刃26回歸至待命位置P2，係如圖19所示，成為回歸齒條130的齒條齒130a、130b自回歸小齒輪131卸除的狀態。因此，在使可動刀刃26回歸至待命位置P2而解除夾紙的階段，能夠解除回歸齒條130的齒條齒130a、130b與回歸小齒輪131的嚙合。 並且，如圖19所示，在可動刀刃26回歸至待命位置P2的時機，操作桿28的操作桿突部112係對於鎖定臂140的卡合壁部146接觸，並透過卡合壁部146對於鎖定臂140施加外力。藉此，能夠將鎖定臂140推起，並能夠抵抗第3推彈構件160的推彈力，使鎖定臂140以從載台單元6側前往頭部單元5側的方式以擺動軸線O2為中心擺動。因此，能夠伴隨於鎖定臂140的擺動，使鎖定爪部145逐漸遠離載台軸承51。 並且，藉由進一步對於操作桿28進行操作，並移動至如圖20所示之解除鎖定位置P5，能夠使鎖定臂140從收容溝62退避至頭部單元5側，而能夠使鎖定爪部145大幅遠離載台軸承51，以將開放口62a開啟。藉此，能夠容許載台軸承51從收容溝62內脫離。 並且，連動於前述之鎖定臂140的動作，係如圖20所示，能夠利用推起臂147，將載台軸承51從收容溝62的溝底部62b往開放口62a側推起。特別是，在操作桿28到達解除鎖定位置P5時，係如圖20所示，能夠利用推起臂147以使載台滾輪45的滾輪中心比引導突起63的頂點部63a更往開放口62a側移動的方式將載台軸承51推起。 又，另一方之鎖定臂150，因能夠透過連結軸部141與其中一方之鎖定臂140同步作動，故亦能夠與前述般同樣地作動。因此，藉由使操作桿28位於解除鎖定位置P5，能夠利用載台鎖定機構30將載台滾輪45切換為解除鎖定狀態，而能夠使頭部單元5與載台單元6分離。因此，能夠使載台單元6所安裝的列印機罩3開放。 如以上說明般，依據本實施形態之列印單元4及熱列印機1，係能夠利用鎖定臂140、150，防止載台軸承51從收容溝62內脫離，故能夠確實鎖定載台滾輪45。並且，鎖定臂140、150，係以維持鎖定狀態的方式被第3推彈構件160推彈，故能夠防止意外地繞擺動軸線O2擺動而使鎖定狀態解除之情事。 並且，連動於操作桿28的操作，不僅使鎖定臂140、150從收容溝62退避，尚能夠利用推起臂147將載台軸承51強制地往開放口62a側推起，故能夠不受第3推彈構件160的推彈力影響地使載台滾輪45從收容溝62脫離。因此，不需以過大的力對於操作桿28進行操作，僅需些許的操作力便能夠解除載台滾輪45的鎖定，故能夠使頭部單元5與載台單元6順暢地分離。 並且，於載台滾輪45之解除鎖定時，與以往不同，係使鎖定臂140、150從載台單元6側往頭部單元5側擺動，故不必於載台單元6側確保有使鎖定臂140、150可動的可動空間。因此，能夠使載台單元6小型化、薄型，並能夠使列印單元4全體的外形尺寸小巧。 並且，因利用鎖定臂140、150按壓載台軸承51，故不易產生其中一方之載台軸承51被鎖定但另一方之載台軸承51未被鎖定或鎖定不充分之所謂單邊鎖定(單邊豎起)之問題。因此，不必附加用以防止單邊鎖定的機構等，而能夠達成設計之簡易化。並且，因將鎖定臂140、150及推起臂147一體形成為一個構件，故能夠削減零件數，而有助於構成之簡略化。 並且，在利用推起臂147推起載台軸承51之際，推起臂147以使載台滾輪45的滾輪中心比引導突起63的頂點部63a更往開放口62a側移動的方式將載台軸承51大幅強制推起。因此，能夠將載台軸承51推起至收容溝62之開放口62a附近，而轉移至幾乎脫離的狀態，藉此能夠使頭部單元5與載台單元6的分離作業更為容易地進行。 並且，因具備回歸機構29，故即便於固定刀刃46與可動刀刃26之間發生夾紙，且因該夾紙導致可動刀刃26停止在切斷位置P1的情形，能夠藉由對於操作桿28進行操作，解除夾紙之後，解除載台滾輪45的鎖定。因此，能夠獲得非常容易使用之列印單元4以及熱列印機1。特別是，伴隨於將操作桿28從鎖定位置P3往解除鎖定位置P5操作，能夠在一連串的流程中連動進行夾紙的解除及載台滾輪45的解除鎖定，故能夠獲得更加容易使用之列印單元4及熱列印機1。 除此之外，因具備利用行星齒輪134之增速機構136，故能夠確保對於操作桿28的操作行程量之回歸齒輪132的旋轉量大。因此，能夠在將操作桿28的操作行程量抑制為較小的狀態，確保用以使可動刀刃26回歸至待命位置P2側所必要的回歸齒輪132的旋轉量。藉此，能夠確保操作桿28之良好的操作性。 並且，本實施形態之回歸齒輪132，係能夠使最先對於回歸小齒輪131嚙合的齒輪齒部132b，往回歸齒輪132的徑方向內側退避。因此，能夠使齒輪齒部132b更為確實地對於回歸小齒輪131嚙合。 針對該點簡單進行說明。例如，如圖17所示，在回歸齒輪132的齒輪齒部132b嚙合於回歸小齒輪131之際，會有回歸小齒輪131之小齒輪齒的齒頂131a，對於齒輪齒部132b的齒頂抵接，而導致回歸齒輪132的旋轉被回歸小齒輪131阻礙之可能性。然而，即便為如此之情形，亦能夠藉由彈性臂部132c的彈性變形，使齒輪齒部132b往回歸齒輪132的徑方向內側退避。藉此，能夠伴隨回歸齒輪132的旋轉，使齒輪齒部132b以越過小齒輪齒的齒頂131a的方式移動。因此，能夠在越過小齒輪齒的齒頂131a之後，利用彈性臂部132c的彈性回復力使齒輪齒部132b從退避位置回歸到原本的位置。因此，能夠使齒輪齒部132b對於下個小齒輪齒嚙合。 接著，根據圖式對本發明之其他實施形態進行說明。又，於本實施形態中，對於與前述實施形態相同的構件係賦予相同的符號，並省略其說明。因此，在此僅針對與前述之實施形態不同之處為主進行說明。 圖21～圖24，係表示本發明之其他實施形態之熱列印機的其中一方的側面。具體而言，圖21，係表示本發明的其他實施形態之熱列印機的圖，且係從圖5所示之箭號A方向觀察的側視圖。圖22，係表示從圖21所示之狀態去除鎖定臂的狀態的側視圖。圖23，係圖21所示之各機構的立體圖。圖24，係表示從圖23所示之狀態去除鎖定臂的狀態的立體圖。 又，圖25～圖29，係表示本發明之其他實施形態之熱列印機的另一方的側面。具體而言，圖25，係於本發明之其他實施形態之熱列印機中，表示另一方之鎖定臂的周邊的側視圖。圖26，係表示從圖25所示之狀態去除另一方之鎖定臂的狀態的側視圖。圖27，係圖25所示之各機構的立體圖。圖28，係表示從圖27所示之狀態去除另一方之鎖定臂的狀態的立體圖。圖29，係圖25所示之鎖定臂的特取部分放大圖。 如圖21～圖24所示，於頭部框架20之其中一方的側壁部60，係豎設有圍繞驅動中間車76之除了嚙合部的周圍之圍繞壁170。另一方面，雖未圖示，然而在安裝於側壁部60之齒輪罩22的內面，於對應於圍繞壁170的位置，形成有與圍繞壁170的形狀一致之軸部。藉此，能夠提升將齒輪罩22安裝於側壁部60之際的定位的精度。 並且，本實施形態之一對鎖定臂140A、150A之鎖定爪部145A，係具有與前述實施形態之鎖定臂140、150的鎖定爪部145不同的形狀。如圖29所示，鎖定爪部145A，係具有：直線狀的脫離防止面148A，係防止載台軸承51於鎖定狀態從連通於開放口62a的收容溝62內脫離。並且，從鎖定臂150A的旋轉中心O3通過載台軸承51的中心的線L1與脫離防止面148A(S1)係垂直相交。該鎖定爪部145A的形狀的特徵，就鎖定臂140A而言亦相同。 如前述般，本實施形態之載台鎖定機構30，係從鎖定臂140A、150A的旋轉中心通過載台軸承51的中心O2的線與形成於鎖定臂140A、150A的鎖定爪部145A的軸承保持面S1成直角的構造。藉此，及便於鎖定狀態時載台滾輪45被外力往脫離收容溝62的方向拉引，亦不會產生使鎖定臂140A、150A往解除方向(亦即，遠離載台軸承51的方向)移動的力，故能夠抑制載台滾輪45脫離。 並且，本實施形態之左右的側壁部60、61，係具備以異形彈簧(wire spring)等構成之載台支承彈簧180、190。該載台支承彈簧180、190，係輔助使載台軸承51被保持於收容溝62內之推彈構件。 如圖21～圖24所示，載台支承彈簧180，係配置於其中一方之側壁部60與鎖定臂140A之間。於載台支承彈簧180的其中一端側，形成有將收容溝62內的載台軸承51往不會脫離的方向按壓之山型狀的軸承按壓部181。載台支承彈簧180之另一端側，係於連結軸部141的周圍折彎，另一端部182，係透過形成於側壁部60的卡止部171卡止於側壁部60。 如圖25～圖29所示，載台支承彈簧190，係配置於另一方之側壁部61與鎖定臂150A之間。於載台支承彈簧190的其中一端側，形成有將收容溝62內的載台軸承51往不會脫離的方向按壓之山型狀的軸承按壓部191。載台支承彈簧190之另一端側，係於連結軸部141的周圍折彎，另一端部192，係透過形成於側壁部61的卡止孔172卡止於側壁部61。 依據前述般構成之載台支承彈簧180、190，軸承按壓部181、191，係將收容溝62內的載台軸承51持續往溝底部62b的方向推彈，而輔助保持載台滾輪45。藉此，即便於鎖定狀態時在鎖定臂140A、150A的脫離防止面148A與載台軸承51之間存在有間隙，亦能夠吸收該間隙所造成之鬆動而保持載台軸承51。因此，能夠使前述之鎖定臂140A、150A的設計公差保有餘裕，並能夠實現鎖定臂140A、150A之順暢的擺動，以及藉由前述脫離防止面148A確實防止載台軸承51脫離。並且，因載台支承彈簧180、190的軸承按壓部181、191係形成為山型狀，故在使載台滾輪45脫離之際。不會過度妨礙該脫離動作。 接著，根據圖式對本發明之其他實施形態的變形例進行說明。又，於本變形例中，對於與前述實施形態相同的構件係賦予相同的符號，並省略其說明，而針對與前述實施形態的不同點為主進行說明。具體而言，係針對隨著操作桿28從鎖定位置P3往解除鎖定位置P5側移動，操作桿28側之載台支承彈簧180往解除載台軸承51的保持之方向擺動，而藉此容許載台軸承51從連通於開放口62a之收容溝62內脫離之情形進行說明。 圖30，係表示本發明的其他實施形態之變形例之熱列印機的圖，且係從內側面觀察操作桿的周邊部的特取部分立體圖。又，於圖30中，為容易觀察與前述實施形態不同的構成而省略一部分構件，然而該等被省略的構件，實際上與前述之實施形態同樣存在。 如圖30所示，於擺動板90的內側面形成有轂狀的突起部96。當擺動板90擺動，則載台支承彈簧180的其中一端部183會抵接於該突起部96。因此，當擺動板90因操作桿28的按下操作進行擺動，則連動於此，載台支承彈簧180的其中一端部183及軸承按壓部181會被往載台軸承51的相反側推起。針對該一連串的動作，根據圖31～圖33進行說明。又，於該等圖31～圖33中，為容易觀察與前述實施形態不同的構成而省略一部分構件，然而該等被省略的構件，實際上與前述之實施形態同樣存在。 圖31A，係表示本發明的其他實施形態之變形例之第1階段(鎖定狀態)，且係從操作桿28的外側面觀察的特取部分側視圖。圖31B，係從操作桿28的內側面觀察圖31A所示之第1階段(鎖定狀態)的特取部分側視圖。圖32A，係從圖31A所示之狀態將操作桿進行按壓移動的操作的第2階段(中間狀態)的特取部分側視圖。圖32B，係從操作桿的內側面觀察圖32A所示之第2階段(中間狀態)的特取部分側視圖。圖33A，係從圖32A所示之狀態將操作桿進行按壓移動的操作的第3階段(解除鎖定狀態)的特取部分側視圖。圖33B，係從操作桿的內側面觀察圖33A所示之第3階段(解除鎖定狀態)的特取部分側視圖。 如圖31A所示，於第1階段(鎖定狀態)，形成於擺動板90之第2板部93的卡合銷95，未抵接在形成於操作桿28的操作桿板110的推起凸輪113。並且，如圖31B所示，擺動板90的突起部96，未與載台支承彈簧180的其中一端部183抵接。因此，於該第1階段(鎖定狀態)，載台支承彈簧180的軸承按壓部181，係將收容溝62內的載台軸承51持續往溝底部62b的方向推彈，而輔助保持載台滾輪45。 如圖32A所示，於第2階段(中間狀態)，藉由操作桿28的按下操作，擺動板90的卡合銷95與操作桿28的推起凸輪113會抵接。並且，藉由將操作桿28進一步按下，擺動板90會以插通於插通孔91的小齒輪支承軸81為中心往圖32B的箭號X方向擺動。如圖32B所示，伴隨擺動板90的擺動，突起部96與載台支承彈簧180的其中一端部183會抵接，而載台支承彈簧180的其中一端部183側會被往遠離載台軸承51的方向按下。藉此，載台支承彈簧180的軸承按壓部181，會往遠離收容溝62內的載台軸承51的方向退避，而使載台軸承51的脫離路徑開放。 如圖33A所示，於第3階段(解除鎖定狀態)，操作桿28係比圖32A、圖32B所示之狀態更進一步被按下，藉此鎖定臂140A會往自收容溝62退避的方向擺動，並且推起臂147會將載台軸承51往開放口62a側強制地推起。此時，在鎖定狀態時輔助保持載台滾輪45的載台支承彈簧180，係已在前述之第2階段(中間狀態)自收容溝62退避，故能夠使收容溝62內的載台軸承51順暢地通過開放口62a脫離。 如以上般，依據本變形例，藉由具備輔助保持載台滾輪45的載台支承彈簧180，即便於鎖定狀態時在鎖定臂140A的脫離防止面148A與載台軸承51之間存在有間隙，亦能夠吸收該間隙所造成之鬆動而保持載台軸承51。並且，在解除鎖定時，在推起臂147推起載台軸承51之前，因載台支承彈簧180解除載台軸承51的保持而往自收容溝62退避的方向擺動，故能夠順暢地使載台滾輪45脫離。因此，能夠減少開放載台滾輪45所必須之操作桿28的按下力，而能夠提升操作性。 以上，雖針對本發明之實施形態進行說明，然而該等實施形態僅係表示作為例子，而並非限定發明之範圍。實施形態係能夠以其他各種形態實施，在不脫離本發明的主旨的範圍內，能夠進行各種省略、置換、變更。實施形態及其變形例，係包含例如發明所屬技術領域具有通常知識者能夠輕易設想者、實質上相同者、均等之範圍者等。 例如，於前述實施形態中，係針對將固定刀刃46設置於列印機罩3(具體而言，載台單元6)，將可動刀刃26設置於殼體2(具體而言，頭部單元5)的例子進行說明，然而不限於此。例如亦可將固定刀刃46設置於殼體2側，將可動刀刃26設置於列印機罩3側。然而，如前述實施形態般，藉由將固定刀刃46設於列印機罩3，則不需將驅動可動刀刃26的驅動機構27設於列印機罩3，故能夠使列印機罩3輕量化，而能夠確保列印機罩3具有良好的開閉操作性。 並且，於前述實施形態中，係針對將固定刀刃46保持在固定狀態，以操作桿28使可動刀刃26回歸至待命位置P2，藉此去除夾紙的例子進行說明，然而不限於此。例如，亦可構成為在以操作桿28使可動刀刃26回歸至待命位置P2之際，使固定刀刃46遠離可動刀刃26。在此情形，例如亦可構成為能夠藉由操作桿28操作使固定刀刃46遠離可動刀刃26的動作。 並且，於前述實施形態中，係針對使操作桿28連動於設在殼體2的操作桿19的轉動動作的例子進行說明，然而不限於此。例如，亦可構成為使操作桿28的前端部露出於殼體2的外側，而能夠從殼體2的外側直接對於操作桿28進行操作。 另外，於前述實施形態中，係針對以太陽齒輪133、行星齒輪134及內齒輪135構成加速機構136的例子進行說明，然而例如亦可使增速機構136為其他構成。並且，於前述實施形態中，雖舉出具備回歸機構29的情形為例進行說明，然而回歸機構29並非必須，不具備亦可。並且，即便具備回歸機構29，亦可採用其他構成。 並且，雖於前述實施形態中，係構成利用一對鎖定臂140、150按壓一對載台軸承51之雙方，然而不限於此，亦可構成為利用1個鎖定臂按壓至少其中一方之載台軸承51。 Hereinafter, an embodiment of the present invention will be described with reference to the attached drawings. As shown in Figs. 1 and 2, a thermal printer 1 is a printer that prints on a recording paper P (thermal paper) in a roll form and can use the recording paper P as, for example, a ticket or a receipt. The thermal printer 1 is, for example, installed in a storefront and its operation is controlled by an information processing device (not shown). Therefore, the thermal printer 1 is controlled to print various information sent from the information processing device on the recording paper P and discharge the printed recording paper P. The thermal printer 1 is, for example, installed on a setting surface S of a storefront and is formed in a block shape as a whole. In the present embodiment, in the state shown in FIG. 1 and FIG. 2 , the direction perpendicular to the setting surface S is referred to as the up-down direction L1, and the directions orthogonal to each other in the plane parallel to the setting surface S are referred to as the front-back direction L2 and the left-right direction L3. In the front-back direction L2, the front is indicated by an arrow FW, and the back is indicated by an arrow BK. Therefore, in FIG. 1 and FIG. 2 , the lower left side of the paper surface is the front FW, and the upper right side is the back BK. The thermal printer 1 is a so-called front-exit type that has a housing (printer body of the present invention) 2, a printer cover 3, and a printing unit 4 composed of a head unit 5 and a stage unit 6, and discharges the recording paper P to the front FW. In the example shown in the figure, the stage unit 6 is provided on the printer cover 3 side, and the head unit 5 is provided on the housing 2 side. However, this is not limited to the case, and for example, the head unit 5 is provided on the printer cover 3 side, and the stage unit 6 may be provided on the housing 2 side. The housing 2 is formed into a block shape having an opening at the front FW by using a synthetic resin material, a metal material, or a suitable combination thereof, and has a plurality of outer surfaces 10 including a bottom surface 11 facing the setting surface S. However, the shape of the housing 2 is limited to this case, and may be appropriately changed. Among the plurality of outer surfaces 10, the outer surface facing the bottom surface 11 in the vertical direction L1 is referred to as a top surface 12. Furthermore, among the plurality of outer surfaces 10, the outer surface located on the front FW side is called the front surface 13, and the outer surface located on the rear BK side is called the rear surface 14. The front surface 13 and the rear surface 14 are opposite to each other in the front-rear direction L2. Furthermore, among the plurality of outer surfaces 10, the outer surfaces that are opposite to each other in the left-right direction L3 are called a pair of side surfaces 15. Inside the housing 2, there is formed a recording paper storage section 16 that can store a rolled recording paper P through an opening formed in the front surface 13 of the housing 2. Thereby, when the printer cover 3 is opened, the rolled recording paper P can be put into the recording paper storage section 16 from the front FW. The printer cover 3 is connected to the lower part of the front side 13 of the housing 2 via the rotating shaft 17, and the opening is closed in a manner that it can be opened. In addition, the printer cover 3 is connected to rotate within an angle range of approximately 90 degrees around the rotating shaft 17. As shown in FIG1, it is designed that when the printer cover 3 is closed, there is a slight gap between the front end of the printer cover 3 and the housing 2. The recording paper P is pulled out from the inside of the housing 2 to the front FW and discharged by utilizing this gap. Therefore, this gap functions as a discharge port 18 for the recording paper P. The housing 2 and the printer cover 3 constructed as described above are locked as the stage unit 6 and the head unit 5 are combined when the printer cover 3 is closed. Thereby, the printer cover 3 is locked in the closed state. In addition, in the housing 2, as shown in FIG1, at the corner where the front surface 13, the top surface 12 and one of the side surfaces 15 intersect, there is provided an operating lever 19 for releasing the combination (locking) of the stage unit 6 and the head unit 5. Thereby, as shown in FIG2, the lock of the printer cover 3 can also be released, and the opening operation of the printer cover 3 can be performed. In addition, the operating lever 19 can be pressed downward, for example. In addition, the printer cover 3 is provided with an operation button 3a such as a power button or a paper feed button. The operation button 3a is arranged on the outside of the printer cover 3 in a state where it is exposed so as to be pressed. In the example shown in the figure, the operation buttons 3a are arranged in a row in the vertical direction L1 below the operating lever 19. As shown in FIGS. 2 to 5, the printing unit 4 includes: a head unit 5, which is provided on the side of the housing 2; and a stage unit 6, which is provided on the side of the printer cover 3 and is assembled to the head unit 5 in a manner that allows it to be separated. The head unit 5 includes: a head frame 20 made of, for example, synthetic resin, which forms a basic frame of the head unit 5; a head cover plate 21 made of, for example, metal, which is assembled to the head frame 20 in a manner of covering the head frame 20 from the front FW and the left-right direction L3; and gear covers 22 and 23 made of, for example, metal, which are assembled to the head frame 20 in a manner of covering the head frame 20 from the left-right direction L3. In addition, the head unit 5 includes at least a thermal head 25, a movable blade 26, a driving mechanism 27, an operating lever 28, a return mechanism 29, and a stage locking mechanism 30. The thermal head 25, movable blade 26, drive mechanism 27, operating rod 28, return mechanism 29 and stage locking mechanism 30 are mainly installed by using the head frame 20, and are covered by the head cover plate 21 and the gear covers 22 and 23. The head unit 5 constructed as described above is installed inside the housing 2. Specifically, the head unit 5 is arranged above the recording paper storage part 16 and close to the front face 13 of the housing 2, and is mainly installed on the housing 2 by screw locking of the head frame 20. In this embodiment, the head unit 5 is installed in a manner that the tip 26a of the movable blade 26 faces downward. In addition, the head unit 5 will be described in detail later. The stage unit 6 includes: a stage frame 40 made of, for example, synthetic resin, which forms the basic framework of the stage unit 6; and a stage cover plate 41 made of, for example, metal, which is assembled to the stage frame 40 in a manner of covering the stage frame 40 from the front FW and the left and right directions L3. The stage unit 6 includes at least a stage roller 45 and a fixed blade 46. The stage rollers 45 and the fixed blade 46 are mainly installed using the stage frame 40 and covered by the stage cover plate 41. The stage unit 6 constructed as described above is mainly installed on the inner surface of the printer cover 3 via the stage cover plate 41. At this time, the stage unit 6 is installed in a position assembled in a manner of being able to be separated from the head unit 5 accompanying the opening and closing action of the printer cover 3. In the present embodiment, the carrier unit 6 is installed in such a manner that the blade tip 46a of the fixed blade 46 faces upward. The carrier unit 6 is described in detail. As shown in FIGS. 3 to 6 , the fixed blade 46 is supported by the carrier frame 40 in such a manner that the blade tip 46a faces the side of the head unit 5 when the head unit 5 and the carrier unit 6 are assembled. As shown in FIG. 6 , a carrier storage space 47 for storing the carrier roller 45 is formed in the portion of the carrier frame 40 that is located further back BK than the fixed blade 46, and a support wall 48 is formed that is arranged and supports the carrier roller 45 in such a manner that the carrier storage space 47 is opposed to each other in the left-right direction L3. The stage roller 45 is a rubber roller that transports the recording paper P to the outside of the printer cover 3, and a rubber layer is formed on the stage shaft 50 extending in the left-right direction L3. The stage roller 45 is stored in the stage storage space 47 in a state where a part of the outer peripheral surface is exposed on the side of the head unit 5, and is supported by the support wall 48 in a rotatable manner. Specifically, cylindrical stage bearings 51 are respectively covered on both ends of the stage shaft 50 extending to the outside of the left-right direction L3 than the stage roller 45. Thereby, even if a pair of stage bearings 51 are pressed, the stage roller 45 can be rotated. Furthermore, a driven gear 52 is fixed to one end of the stage shaft 50, further outward in the left-right direction L3 than the stage bearing 51. The support wall 48 is fixed by clamping the stage bearing 51 by, for example, a slit hole. Thus, the stage roller 45 is rotatably supported by the pair of support walls 48 through the pair of stage bearings 51 when stored in the stage storage space 47. The pair of stage bearings 51 extend further outward in the left-right direction L3 than the support wall 48, and are respectively stored in a pair of storage grooves 62 provided on the side of the head unit 5 as shown in FIG. 5 when the printer cover 3 is closed. In addition, in FIG. 5 , the stage roller 45 and the stage bearing 51 are mainly illustrated in the stage unit 6. Next, the head unit 5 is described in detail. As shown in FIG. 3 to FIG. 5 , the head unit 5 has at least a thermal head 25, a movable blade 26, a drive mechanism 27, an operating lever 28, a return mechanism 29, and a stage locking mechanism 30. As shown in FIG. 5 , the thermal head 25 has a plurality of heating elements (not shown) arranged in a line along the left-right direction L3, and is mounted on the head frame 20 in a manner facing the stage roller 45 when the printer cover 3 is in the closed position. In addition, the recording paper P can pass between the stage roller 45 and the thermal head 25. Between the thermal head 25 and the head frame 20, there is a coil spring (not shown) that pushes the thermal head 25 toward the stage roller 45. Thus, the thermal head 25 can be pressed against the recording paper P being fed by the stage roller 45, and printing can be performed well by the printing unit 4. The head frame 20 has a pair of side wall portions 60 and 61 that are located further outside the support wall 48 of the stage frame 40 of the stage unit 6 in the left-right direction L3. A pair of receiving grooves 62 that can fit a pair of stage bearings 51 into the inside are formed in the pair of side wall portions 60 and 61, respectively. The receiving groove 62 is formed in a U-shape in side view as shown in FIG. 7 , and is formed in a state where the opening 62a faces the front FW on the side of the carrier unit 6. The groove bottom 62b of the receiving groove 62 is formed flat. FIG. 7 illustrates the receiving groove 62 formed on one side of the side wall portion 60, and the illustration of other components is appropriately omitted. On the inner side surface of the receiving groove 62, there is formed: an inclined guide protrusion 63, the opening width of which narrows from the opening 62a side to the groove bottom 62b side, and guides the carrier bearing 51 to the groove bottom 62b side. Thus, the receiving groove 62 is formed in such a way that the opening width of the opening 62a is the largest, and is formed in such a way that the opening width is the smallest near the apex 63a of the guide protrusion 63. By forming the guide protrusion 63 in the receiving groove 62, the stage bearing 51 can be guided in such a way that it falls into the side of the groove bottom 62b along the guide protrusion 63. Since the receiving grooves 62 are formed in the pair of side wall portions 60 and 61 as described above, the pair of stage bearings 51 are embedded in the pair of receiving grooves 62 and are received therein when the head unit 5 and the stage unit 6 are assembled, as shown in FIG. 5 and FIG. 7. At this time, the stage bearing 51 is received in the receiving groove 62 in a state of being in contact with the groove bottom 62b. As shown in FIG4 , the movable blade 26 is mounted on the head frame 20 through the drive mechanism 27 in a manner that the blade tip 26a faces the side of the stage unit 6 when the head unit 5 and the stage unit 6 are combined. At this time, the movable blade 26 is arranged so as to face the fixed blade 46 in the vertical direction L1, and is arranged so as to overlap the fixed blade 46 in the front-rear direction L2 when it moves to the cutting position P1. As shown in FIG8 , the movable blade 26 is a plate-shaped blade in a V-shape whose length from the root to the blade tip 26a gradually shortens from both ends toward the center. FIG8 is a three-dimensional view showing a state in which the movable blade 26 is moved to the cutting position P1 and the recording paper P is cut between the fixed blade 46 and the movable blade 26. As shown in FIG4 , the movable blade 26 is mounted on the driving gear 71 of the driving mechanism 27 through the movable blade clamp 70. The movable blade 26 is configured to be movable in the up-down direction L1 relative to the head frame 20 by the operation of the driving mechanism 27. Thereby, the movable blade 26 is supported in a manner capable of moving in the up-down direction L1 relative to the fixed blade 46. As shown in FIG4 , FIG9 and FIG10 , the driving mechanism 27 is a mechanism for moving the movable blade 26 to the cutting position P1 and the standby position P2. The so-called cutting position P1 is a position where the movable blade 26 steps onto the fixed blade 46 and the movable blade 26 and the fixed blade 46 cut the recording paper P together (refer to FIG8 ). The so-called standby position P2 is a position where the movable blade 26 is appropriately away from the fixed blade 46 (refer to FIG. 4 ). The driving mechanism 27 includes a driving motor 75, a driving intermediate car 76, a second-stage intermediate car 77, a driving pinion 78, and a driving rack 71. As shown in FIG. 10 , the driving motor 75 is a motor capable of forward and reverse rotation, and is fixed to the inner side of the side wall portion 60 of one side of the head frame 20. The driving shaft of the driving motor 75 is connected to the speed reduction mechanism 75a. In addition, the output shaft 75b of the speed reduction mechanism 75a protrudes further to the outside in the left-right direction L3 than the side wall portion 60 of one side of the head frame 20. The driving intermediate car 76 is arranged on the outer side of one of the side wall portions 60 in the left-right direction L3, and is connected to the output shaft 75b of the speed reduction mechanism 75a. Therefore, the driving intermediate car 76 rotates along with the rotation of the driving motor 75 through the speed reduction mechanism 75a. As shown in Figures 9 and 10, the two-stage intermediate car 77 is arranged between the driving intermediate car 76 and the driving pinion 78, and is supported by the intermediate support shaft 80 in a rotatable manner. The two-stage intermediate car 77 includes a large-diameter intermediate car 77a and a small-diameter intermediate car 77b formed to be smaller in diameter than the large-diameter intermediate car 77a. The large-diameter intermediate car 77a is engaged with the driving intermediate car 76 when the operating rod 28 is at the locking position P3. Thus, the entire two-stage intermediate car 77 rotates along with the rotation of the driving intermediate car 76. The small-diameter intermediate car 77b is arranged on the outer side of the large-diameter intermediate car 77a in the left-right direction L3 and is engaged with the driving pinion gear 78. The driving pinion gear 78 is arranged on the side of the operating rod 28 and on the side of the driving gear 71 than the small-diameter intermediate car 77b, and is fixed to the pinion gear support shaft 81 in a coaxial state with the pinion gear support shaft 81. Thereby, the driving pinion 78 and the pinion support shaft 81 rotate as a whole. Furthermore, the driving pinion 78 is engaged with the small-diameter intermediate car 77b, and is engaged with the driving gear tooth 71a of the driving gear 71. As shown in FIG. 4, the driving gear 71 is arranged not only on the side of the side wall portion 60 of one side of the head frame 20, but also on the side of the side wall portion 61 of the other side, and is arranged on both sides of the left-right direction L3 across the head frame 20. Furthermore, the pinion support shaft 81 is formed in a manner that penetrates the head frame 20 in the left-right direction L3, and connects a pair of driving pinion gears 78 arranged on both sides of the left-right direction L3. Thereby, a pair of driving pinions 78 can rotate together in a synchronous state through the pinion support shaft 81. The driving gear 71 is installed at both ends along the left-right direction L3 of the movable blade clamp 70 and extends along the up-down direction L1. Thereby, the driving gear 71 is assembled with the movable blade 26 through the movable blade clamp 70. The driving gear 71 is formed with driving gear teeth 71a covering the entire area. A pair of driving pinions 78 is engaged with the driving gear teeth 71a. Therefore, with the rotation of the pair of driving pinions 78, the movable blade 26 can be moved between the standby position P2 and the cutting position P1 through the driving gear 71. In the following, for easy understanding of the structure, the driving pinion 78 and the driving gear 71 located on one side of the side wall portion 60 (driving motor 75 side) are described in detail, and the driving pinion 78 and the driving gear 71 on the other side of the side wall portion 61 are omitted. Since the driving mechanism 27 is configured as described above, as shown in Fig. 4 and Fig. 9, the driving motor 75 can rotate the driving pinion 78 via the driving intermediate car 76 and the two-stage intermediate car 77 (large diameter intermediate car 77a and small diameter intermediate car 77b). Therefore, the driving gear 71 can be moved in the arrow F1 direction together with the return gear 130 described later of the return mechanism 29, and the movable blade 26 can be moved in the same direction. Thereby, the movable blade 26 can be moved from the standby position P2 to the cutting position P1. On the other hand, by rotating the driving motor 75 in the reverse direction, the driving pinion 78 can be rotated in the reverse direction via the driving intermediate car 76 and the second intermediate car 77. Therefore, the driving gear 71 can be moved in the direction of arrow F2 together with the return gear 130, and the movable blade 26 can be moved in the same direction. In this way, the movable blade 26 can be moved from the cutting position P1 to the standby position P2 and return. However, the intermediate support shaft 80 supporting the second intermediate car 77 is fixed to the swing plate 90 configured to be swingable with the pinion support shaft 81 as the center. As shown in Fig. 7, Fig. 9 to Fig. 11, the swing plate 90 is provided with an insertion hole 91 which penetrates the swing plate 90 in the left-right direction L3 and through which the pinion support shaft 81 is inserted. The swing plate 90 is configured to be able to swing along the wall surface of one of the side wall portions 60 in a state where the pinion support shaft 81 is inserted into the insertion hole 91. The swing plate 90 includes: a first plate portion 92 extending from the insertion hole 91 to between the driving intermediate vehicle 76 and the driving gear 71; and a second plate portion 93 extending from the insertion hole 91 to the swing axis O2 of the locking arm 140 described later. The intermediate support shaft 80 is formed to extend from the first plate portion 92 to the outside in the left-right direction L3. Thus, the two-stage intermediate car 77 supported by the intermediate support shaft 80 can swing along with the swing plate 90 with the pinion support shaft 81 as the center. The second plate portion 93 is formed with a locking protrusion 94 and a locking pin 95 so as to protrude to the outside in the left-right direction L3. The swing plate 90 thus constructed is continuously pushed in the direction of engaging the large-diameter intermediate car 77a of the two-stage intermediate car 77 with the driving intermediate car 76 by the pushing force caused by the first pushing member 100. The first push member 100 includes: a coil portion 100a, which is, for example, a coil spring and is supported by a coil support shaft 105 protruding from one of the side wall portions 60; a first coil end portion 100b, which is locked to the head frame 20; and a second coil end portion 100c, which is locked to the locking protrusion 94 of the swing plate 90. Thus, the swing plate 90 is pushed toward the operating rod 28 by the push force (elastic restoring force) of the first push member 100, so that the large-diameter intermediate vehicle 77a is positioned in a state where it is pressed against the driving intermediate vehicle 76. In addition, the first push member 100 is not limited to a coil spring, and may be, for example, a leaf spring. Furthermore, the swing plate 90 is configured so that the engaging pin 95 is pushed up by the push-up cam 113 described later in association with the operation of the operating rod 28, thereby resisting the push-up force of the first push-up member 100 and swinging around the pinion support shaft 81 as the center, so that the second-stage intermediate car 77 is separated from the driving intermediate car 76. In this way, the engagement between the second-stage intermediate car 77 and the driving intermediate car 76 can be released. As shown in FIG. 4, FIG. 9 and FIG. 10, the operating rod 28 is arranged on the side of the side wall portion 60 of one side of the head frame 20, and is supported rotatably through the operating rod support shaft 106. The operating rod 28 is configured to be able to press one of the side wall portions 60 in a counterclockwise direction when viewed from the outside in the left-right direction L3 toward the engagement release position P4 or the unlocking position P5 described later, with the operating rod support shaft 106 as the center of the locking position P3. The operating rod support shaft 106 is provided to protrude from the inner surface of the gear cover 22 toward one of the side wall portions 60 as shown in FIG. 11. The center axis of the operating rod support shaft 106 is the rotation axis O1 of the operating rod 28. The so-called locking position P3 refers to the position where the stage unit 6 is kept in a locked state with respect to the head unit 5. The so-called engagement release position P4 refers to the position where the engagement between the large-diameter intermediate car 77a of the two-stage intermediate car 77 and the driving intermediate car 76 is released by swinging the swing plate 90 through the push-up cam 113 described later of the operating lever 28. The so-called unlocking position P5 refers to the position where the locking state of the head unit 5 by the stage unit 6 is released. As shown in Figures 9 to 11, at the base end of the operating lever 28, there is formed: an operating lever plate 110, which is formed in a fan shape in side view. On the outside of the operating lever plate 110, a planetary shaft 111 is provided to protrude outward in the left-right direction L3. On the inner surface of the operating lever plate 110, an operating lever protrusion 112 is formed, which is engaged with the locking arm 140 described later. Furthermore, a push-up cam 113 and a restricting protrusion 114 that bulge outward in the radial direction are formed on the operating lever plate 110. The planetary shaft 111 is formed at a position offset from the operating lever support shaft 106. The push-up cam 113 is arranged on the clockwise side of the engaging pin 95 formed on the swing plate 90, and can contact the engaging pin 95 when the operating lever 28 rotates from the locking position P3 to the unlocking position P5. Furthermore, a locking protrusion 115 that protrudes outward in the left-right direction L3 is formed on the outer surface of the push-up cam 113. The limiting protrusion 114 is arranged on the counterclockwise side of the push-up cam 113, and contacts the limiting wall 116 formed on the head frame 20 from the clockwise side when the operating rod 28 is located at the lock position P3. Therefore, the entire operating rod 28 is restricted from further rotating in the clockwise direction, thereby being positioned at the lock position P3. In addition, when the operating rod 28 is moved to the unlock position P5 and is pressed and moved backward, it can contact the limiting wall 117 of the gear cover 22 shown in Figures 3 and 11 from the counterclockwise side. Therefore, the operating rod 28 is restricted from exceeding the unlock position P5 and being further pressed. The front end of the operating rod 28 is fitted into the inner side of the connecting body 19a (refer to FIG. 2) of the operating rod 19 provided in the housing 2. Therefore, the operating rod 28 is operated in conjunction with the operation of the operating rod 19. Thus, by operating the operating rod 19, the operating rod 28 can be operated in conjunction therewith from the locking position P3 to the unlocking position P5. The operating rod 28 constructed as described above is continuously pushed in the direction (clockwise direction) toward the locking position P3 by the pushing force caused by the second pushing member 120 as shown in FIG. 9 and FIG. 10. The second push-pull member 120 includes: a coil portion 120a, which is, for example, a coil spring and is supported by a coil support shaft (not shown) protruding from the inner surface of the gear cover 22; a first coil end 120b, which is locked to the inner surface of the gear cover 22; and a second coil end 120c, which is locked to the locking protrusion 115 of the operating rod 28. Thus, the operating rod 28 is pushed clockwise by the push force (elastic restoring force) of the second push-pull member 120, so that the front end of the operating rod 28 is pushed in the direction of the locking position P3. As described above, since the limiting protrusion 114 of the operating lever 28 contacts the limiting wall portion 116 of the head frame 20, the operating lever 28 is restricted so as not to be further rotated and is positioned at the locked position P3. The second push spring member 120 is not limited to a coil spring, and may be a leaf spring, for example. As shown in FIG. 4 , the return mechanism 29 is a mechanism for moving the movable blade 26 from the cutting position P1 to the standby position P2 before the stage locking mechanism 30 switches the stage roller 45 to the unlocked state by the operating force (rotational force) applied to the operating lever 28 from the locking position P3 to the unlocking position P5, when the movable blade 26 is stopped at the cutting position P1, for example, by the occurrence of paper jamming. As shown in Figures 9 to 12, the return mechanism 29 includes: a return gear 130 formed on the drive gear 71; a return pinion 131 engaged with the toothed gear 130a of the return gear 130; a return gear 132 and a sun gear 133 supported so as to be coaxial with the rotation axis O1 of the operating rod 28 and capable of rotating around the rotation axis O1; a planetary gear 134 engaged with the sun gear 133 and revolving with the movement of the operating rod 28; and an inner gear 135 engaged with the planetary gear 134. Furthermore, the sun gear 133, the planetary gear 134 and the inner gear 135 constitute a speed increasing mechanism 136 (see FIG. 12 ). Furthermore, in the present embodiment, although the case where the return gear 132 and the sun gear 133 are constituted as one component is taken as an example, the present invention is not limited to this case. For example, as long as the return gear 132 and the sun gear 133 can be rotated integrally (rotated together), the return gear 132 and the sun gear 133 may be formed separately and combined. The return pinion 131 is rotatably supported by the pinion support shaft 81 in a state where it is arranged outside the drive pinion 78 in the left-right direction L3. Thus, the return pinion 131 is arranged coaxially with the drive pinion 78. The return pinion 131 can be engaged with the return gear 132 that rotates in conjunction with the operation of the operating lever 28, and rotates by the rotational force from the return gear 132. Furthermore, the return pinion 131 can be engaged with the tooth 130a of the return gear 130. As shown in FIG. 9 and FIG. 10 , the return gear 130 is formed integrally with the drive gear 71 in a state of being arranged on the outer side of the drive gear 71 of the drive mechanism 27 in the left-right direction L3. The return gear 130 has a plurality of gear teeth 130a. The plurality of gear teeth 130a are formed in a manner of being located on the root side of the movable blade 26 rather than on the blade tip 26a side. Thus, the return gear 130 is engaged with the return pinion gear 131 when the movable blade 26 is located at the cutting position P1, and is released from the engagement with the return pinion gear 131 when the movable blade 26 is located at the standby position P2. In the example shown in the figure, the driving gear 71 and the return gear 130 are formed as one body, but the present invention is not limited to this case, and the return gear 130 may be formed as a separate body from the driving gear 71. However, by forming the driving gear 71 and the return gear 130 as one body, the return gear 130 can be provided without increasing the number of parts, so that the structure can be simplified and the cost can be reduced, which is preferred. Among the plurality of gear teeth 130a, the gear teeth 130a located on the blade tip 26a side of the movable blade 26 are gear teeth 130b that can be displaced. The gear teeth 130b are formed at the front end of the gear arm 139. The base end of the gear arm 139 is connected to the end of the driving gear 71 located on the side of the blade tip 26a of the movable blade 26. Therefore, the gear arm 139 is a cantilever that can be elastically deformed in a direction away from the return pinion 131 with the base end as a fulcrum. In this way, the gear arm 139 can be elastically deformed in a direction away from the return pinion 131, and the gear teeth 130b can be retracted to the outside of the return pinion 131 in the radial direction. The reason why the rack teeth 130b of the return gear 130 are formed to be able to retreat to the radial outer side of the return pinion 131 is briefly described. For example, when the return gear 130 moves in the direction of arrow F1 shown in FIG. 9 , the rack teeth 130b of the return gear 130 may abut against the tooth top of the tooth portion of the return pinion 131. In this case, the movement of the return gear 130 may be blocked by the tooth top of the return pinion 131. In consideration of such a situation, the gear teeth 130b are formed at the front end of the gear arm 139, so that the gear teeth 130b can be retracted to the radial outer side of the return pinion 131 by elastic deformation of the gear arm 139, and can pass over the tooth top of the return pinion 131. Therefore, after the gear teeth 130b pass over the tooth top of the return pinion 131, the gear teeth 130b are returned to the original position by the elastic restoring force of the gear arm 139, so that the returned gear teeth 130b can be properly engaged with the lower tooth portion of the return pinion 131. Thereby, the problem of the movement of the return gear 130 being blocked does not occur, and the gear 130b of the return gear 130 can be properly engaged with the return pinion 131. As shown in FIG9 and FIG10, the return gear 132 is rotatably supported by the operating rod support shaft 106 in a state where it is arranged further outside the operating rod plate 110 of the operating rod 28 in the left-right direction L3. Thereby, the return gear 132 is arranged coaxially with the rotation axis O1 of the operating rod 28. The return gear 132 includes a gear support plate 132a and a plurality of gear teeth 132b formed along the outer periphery of the gear support plate 132a. The plurality of gear teeth 132b do not cover the entire circumference of the gear support plate 132a, but are formed to cover up to half of the circumference. The plurality of gear teeth 132b can engage with the return pinion 131. By operating the operating lever 28 from the locking position P3 to the unlocking position P5, the gear tooth portion 132b that first engages with the return pinion 131 among the plurality of gear tooth portions 132b can be displaced radially inward of the return pinion 132 and can be retracted from the teeth of the return pinion 131. The gear tooth portion 132b is formed at the front end of the elastic arm portion 132c. The elastic arm portion 132c is formed integrally at the base end portion of the outer periphery of the gear support plate 132a where the gear tooth portion 132b is not formed, and extends in an arc shape in the clockwise direction along the outer periphery of the gear support plate 132a. Thus, the elastic arm portion 132c is cantilevered and supported on the outer periphery of the gear support plate 132a through the base end portion, and can be elastically deformed in the radial direction with the base end portion as a fulcrum. Thereby, the elastic arm 132c is elastically deformed toward the gear support plate 132a, thereby enabling the gear tooth portion 132b to be displaced radially inward of the return gear 132, and to be able to retreat from the tooth portion of the return pinion 131. As shown in FIG12 , the sun gear 133 is formed integrally with the inner surface of the gear support plate 132a, and is arranged coaxially with the rotation axis O1 of the operating lever 28. Thereby, the sun gear 133 can rotate around the rotation axis O1 together with the return gear 132. The planetary gear 134 is supported by the operating rod 28 via the planetary shaft 111 in a rotatable manner while being engaged with the sun gear 133. As a result, the operating rod 28 rotates around the rotation axis O1, and the planetary gear 134 orbits around the rotation axis O1 to follow the movement of the operating rod 28. An inner gear 135 is formed on the inner surface of the gear cover 22 to which the planetary gear 134 is engaged. Therefore, the planetary gear 134 orbits along with the movement of the operating rod 28, and can rotate while being engaged with the inner gear 135. The planetary gear 134 rotates in this way, thereby enabling the sun gear 133 and the return gear 132 to rotate around the rotation axis O1, and enabling the gear tooth portion 132b of the return gear 132 to engage with the return pinion 131. As shown in FIG5, the stage locking mechanism 30 is a mechanism having locking arms 140 and 150 that can swing around the swing axis O2 parallel to the stage roller 45, and can switch between a locking state for locking the stage roller 45 and an unlocking state for releasing the lock. As shown in FIG. 5 , FIG. 9 and FIG. 10 , one of the locking arms 140 is disposed on the side of one of the sidewall portions 60 of the head frame 20 , and the other of the locking arms 150 is disposed on the side of the other sidewall portion 61 . The pair of locking arms 140, 150 press the carrier bearing 51 accommodated in the accommodation groove 62 from the opening 62a side when the operating rod 28 is located at the locking position P3, and swing around the swing axis O2 from the carrier unit 6 to the head unit 5 side as the operating rod 28 moves from the locking position P3 to the unlocking position P5 side, and allow the carrier bearing 51 to move away from the carrier bearing 51 and disengage from the accommodation groove 62. Therefore, the stage locking mechanism 30 of the present embodiment utilizes a pair of locking arms 140, 150 to simultaneously lock a pair of stage bearings 51 and simultaneously unlock them. The locking arm 140 on one side and the locking arm 150 on the other side are connected by a long connecting shaft 141 extending along the left-right direction L3. The connecting shaft 141 is a cylindrical shaft as shown in FIG. 10, formed in a manner penetrating the head frame 20 in the left-right direction L3, and supported by the side wall 60 on one side and the side wall 61 on the other side in a rotatable manner. In addition, the central axis of the connecting shaft 141 is the swing axis O2. Furthermore, the locking arm 140 on one side and the locking arm 150 on the other side are respectively connected to both ends of the connecting shaft 141. Thus, the locking arm 140 on one side and the locking arm 150 on the other side can swing around the swing axis O2 in a synchronous state through the connecting shaft 141. In addition, the connecting shaft 141 is configured to be located between the receiving groove 62 and the return gear 132 in the up-down direction L1 and to be located further back BK than the receiving groove 62 in the front-rear direction L2. In addition, in the present embodiment, although the case where a pair of locking arms 140, 150 arranged in the left-right direction L3 are connected to each other through the connecting shaft 141 in a swingable manner is taken as an example, it is not limited to this case. For example, a pair of locking arms 140, 150 and the connecting shaft 141 may be formed integrally by bending a sheet metal or the like, thereby forming a single component. The locking arm 140 on one side will be described in detail. As shown in FIG. 13 , the locking arm 14 is arranged on the upper side of the receiving groove 62 and is formed in a manner extending in the front-rear direction L2. The base end of the locking arm 140 is connected to the end of the connecting shaft 141. A locking claw 145 is formed at the front end of the locking arm 140 to cover the stage bearing 51 received in the receiving groove 62 from the side of the opening 62a of the receiving groove 62. Thus, the stage bearing 51 can be held in a manner such that the stage bearing 51 is sandwiched between the locking claw 145 and the groove bottom 62b of the receiving groove 62. The outer side surface of the locking claw 145 is an inclined guide surface 145b that guides the stage bearing 51 into the receiving groove 62 when the stage bearing 51 is placed in the receiving groove 62. The guide surface 145b is formed so as to define a V-shaped groove in a side view with the guide protrusion 63 on the side of the receiving groove 62. In addition, an engaging wall portion 146 is formed at the base end of the lock arm 140 and is provided to protrude outward in the left-right direction L3. The engaging wall portion 146 is a wall portion that the operating rod protrusion 112 of the operating rod 28 contacts after the push-up cam 113 swings the swing plate 90 through the engaging pin 95 when the operating rod 28 is operated from the locking position P3 to the unlocking position P5. Thus, the entire lock arm 140 is configured to be pressed from the operating rod protrusion 112 through the engaging wall portion 146 as the operating rod 28 is operated, and to swing in the clockwise direction around the swing axis O2. That is, the lock arm 140 is configured to swing upward around the swing axis O2 from the stage unit 6 side to the head unit 5 side. Therefore, the lock claw portion 145 of the lock arm 140 gradually moves away from the stage bearing 51 as the operating rod 28 is operated, and when the operating rod 28 reaches the unlocking position P5, it retreats from the receiving groove 62 to the head unit 5 side, and the opening 62a is opened. This allows the stage bearing 51 to be disengaged from the storage groove 62. In addition, the lock arm 140 is provided with a push-up arm 147 which moves the stage bearing 51 from the groove bottom 62b of the storage groove 62 to the opening 62a side as the operating lever 28 moves from the lock position P3 to the unlock position P5. The push-up arm 147 is arranged on the rear BK side of the groove bottom 62b and is formed to extend downward from the lock arms 140 and 150. The surface of the push-up arm 147 facing the stage bearing 51 side is a push-up surface 147a formed to extend parallel to the groove bottom 62b and to push up the stage bearing 51. Furthermore, when the operating rod 28 is located at the locked position P3, a gap can be ensured between the push surface 147a and the stage bearing 51. Thus, the push-up arm 147 stands by in a non-contact manner with respect to the stage bearing 51 when the operating rod 28 is located at the locked position P3. In particular, since the push-up arm 147 is formed to be longer downward, when the stage bearing 51 is pushed up in the receiving groove 62, the stage bearing 51 can be pushed up greatly toward the opening 62a. Specifically, the stage bearing 51 is pushed up so that the roller center of the stage roller 45 moves toward the opening 62a side from the top point 63a of the guide protrusion 63 formed in the receiving groove 62. The locking arm 140 configured as described above is pushed in the counterclockwise direction toward the stage unit 6 side by the pushing force of the other locking arm 150 (see FIG. 5) that is pushed and arranged on the other side of the side wall 61 of the head frame 20. Thus, the locking arm 140 is always pushed so that the locking claw 145 covers the stage bearing 51 from the opening 62a side. Next, referring to FIG. 14 , the other locking arm 150 will be described. However, since the other locking arm 150 is basically the same as the locking arm 140, the same reference numerals are given to the same components and the description thereof will be omitted. As shown in FIG. 14 , the other locking arm 150 is provided with a locking protrusion 151 protruding outward in the left-right direction L3. Furthermore, the locking arm 150 is always pushed by the push force of the third push member (the push member of the present invention) 160 so as to be in a posture in which the locking claw 145 covers the stage bearing 51 from the opening 62a side. The third push-spring component 160 comprises: a coil portion 160a, which is, for example, a coil spring and is supported by a coil support shaft (not shown) protruding from the inner surface of the other gear cover 23; a first coil end 160b, which is locked to the head frame 20; and a second coil end 160c, which is locked to the locking protrusion 151 of the locking arm 150. Thus, the locking arm 150 is pushed clockwise by the push force (elastic restoring force) of the third push member 160 in the state shown in FIG. 14. Thus, the other locking arm 140 is pushed counterclockwise in the state shown in FIG. 13. Moreover, the third push member 160 is not limited to a coil spring, and may be a leaf spring, etc. Moreover, the stage unit 6 of this embodiment is as shown in FIG. 5, and when assembled with the head unit 5, the driven gear 52 is arranged on the outer side of the other locking arm 150 in the left-right direction L3. The driven gear 52 is capable of engaging with a stage gear system mechanism (not shown) disposed on the side of the side wall portion 61 of the other side of the head frame 20. The stage gear system mechanism is a mechanism that receives power from a driving motor (not shown) for driving the stage roller 45 and operates, and transmits the power to the driven gear 52. In this way, when the head unit 5 and the stage unit 6 are combined, the stage roller 45 can be rotated to feed the recording paper P. Next, the operation of the thermal printer 1 constructed as described above will be described. First, the case where the head unit 5 and the stage unit 6 are combined will be described. In this case, as shown in FIG. 2 , after the roll-shaped recording paper P is placed in the recording paper storage portion 16 of the housing 2, the printer cover 3 is closed, so that the stage unit 6 can be brought close to the head unit 5. Furthermore, as shown in FIG. 1 , by completely closing the printer cover 3, the head unit 5 and the stage unit 6 can be assembled in a state where the recording paper P is sandwiched between the thermal head 25 and the stage roller 45. In addition, as the printer cover 3 is closed, the stage bearing 51 of the stage roller 45 is guided by the guide protrusion 63 of the receiving groove 62 and the guide surface 145b of the locking claw 145, and is received in the receiving groove 62. At this time, the stage bearing 51 pushes the locking claw 145 slightly against the spring force of the third spring member 160 and is inserted into the receiving groove 62. After being pushed by the stage bearing 51, the locking arms 140 and 150 swing around the swing axis O2 by the spring force of the third spring member 160 and return to their original positions, and the stage bearing 51 is pressed from the opening 62a side of the receiving groove 62 by the locking claw 145. As shown in FIG5 , the pair of locking arms 140 and 150 can be used to press the pair of stage bearings 51 received in the pair of receiving grooves 62, respectively, so that the stage bearings 51 can be prevented from being disengaged from the receiving grooves 62. Therefore, the stage locking mechanism 30 can be used to maintain the stage roller 45 in a locked state. As a result, the combination of the head unit 5 and the stage unit 6 can be locked, and the printer cover 3 can also be locked to the housing 2. In addition, by combining the head unit 5 and the stage unit 6, the thermal head 25 and the stage roller 45 are pressed at a predetermined pressure with the recording paper P sandwiched therebetween. Furthermore, the recording paper P is pulled out from the discharge port 18 to the outside of the housing 2 after passing between the movable blade 26 and the fixed blade 46. Furthermore, the driven gear 52 of the stage roller 45 is engaged with the stage gear train mechanism on the side of the head unit 5. Next, the situation of printing various information on the recording paper P is briefly described. In this case, the driving motor is driven to rotate the driven gear 52 through the stage gear train mechanism. Thereby, the stage roller 45 can be rotated, and the recording paper P sandwiched between the stage roller 45 and the thermal head 25 can be fed to the discharge port 18. At the same time, a control signal corresponding to the print data is output to the thermal head 25 and the heating element is heated appropriately. In this way, various characters, graphics, etc. can be printed clearly on the recording paper P being fed. In addition, the printed recording paper P passes between the fixed blade 46 and the movable blade 26. Next, the situation of cutting the recording paper P is briefly described. In this situation, the driving motor 75 drives the driving intermediate car 76 shown in Figure 9 to rotate. Thus, the driving pinion 78 can be rotated through the two-stage intermediate car 77 (large diameter intermediate car 77a and small diameter intermediate car 77b), and the driving gear 71 can be moved in the direction of arrow F1 together with the return gear 130. Thus, the movable blade 26 can be moved from the standby position P2 to the cutting position P1, and the recording paper P can be sandwiched between the fixed blade 46 and cut as shown in FIG8. Therefore, the cut recording paper P can be used as a receipt or ticket, for example. After the recording paper P is cut, the driving motor 75 is reversely rotated. By this, the driving pinion 78 can be rotated in the reverse direction by driving the intermediate car 76 and the second intermediate car 77, and as shown in FIG9, the driving gear 71 can be moved in the direction of arrow F2 together with the return gear 130. Therefore, the movable blade 26 can be moved from the cutting position P1 to the standby position P2 and return. Moreover, when the recording paper P is cut, the return pinion 131 is released from the engagement with the gear tooth portion 132b of the return gear 132, and idling is allowed. Therefore, when the movable blade 26 moves to the cutting position P1, even if the teeth 130a and 130b of the return gear 130 are engaged with the return pinion 131, the return pinion 131 can be made to idle. Therefore, the drive gear 71 and the return gear 130 can be moved without being affected by the return pinion 131, and the recording paper P can be cut. Next, a series of operations will be described in which the operating lever 28 is operated to release the paper jam and unlock the stage unit 6 when a paper jam occurs between the movable blade 26 and the fixed blade 46, thereby opening the printer cover 3. In addition, when a paper jam occurs during cutting of the recording paper P, the movable blade 26 stops at the cutting position P1 where the movable blade 26 steps on the fixed blade 46, as shown in FIG15. In this case, the operating lever 28 is operated from the locking position P3 to the unlocking position P5 against the urging force of the second urging member 120, as shown in FIG15. Thus, the operating rod 28 can be moved in a counterclockwise direction with the rotation axis O1 as the center, and the planetary gear 134 engaged with the inner gear 135 can rotate in a clockwise direction with the planetary shaft 111 as the center and revolve in a counterclockwise direction with the rotation axis O1 as the center along with the movement of the operating rod 28. In addition, with the rotation of the planetary gear 134, the sun gear 133 and the return gear 132 can be rotated in a counterclockwise direction with the rotation axis O1 as the center. The operating rod 28 rotates counterclockwise, so that the push-up cam 113 contacts the engagement pin 95 as shown in FIG16 , and an external force is applied to the swing plate 90 through the engagement pin 95. Therefore, by further operating the operating rod 28, as shown in FIG17 , the swing plate 90 can be pushed up by the push-up cam 113, and the swing plate 90 can be swung clockwise around the pinion support shaft 81 against the push-up force of the first push-up member 100. As a result, the two-stage intermediate car 77 mounted on the swing plate 90 can be separated from the self-driving intermediate car 76, and the engagement between the two-stage intermediate car 77 and the driving intermediate car 76 can be released. Therefore, the position of the operating lever 28 at this time is equivalent to the engagement release position P4. In addition, as the swing plate 90 swings, the sun gear 133 and the return gear 132 rotate counterclockwise along with the operation of the operating lever 28, so as shown in FIG. 17, the first gear tooth portion 132b of the return gear 132 can be engaged with the return pinion gear 131 when the engagement between the second-stage intermediate car 77 and the driving intermediate car 76 is released. Thereby, the return pinion gear 131 can be rotated in the clockwise direction. Therefore, by further operating the operating lever 28 from the engagement release position P4 shown in FIG. 17 to the unlocking position P5, the remaining gear teeth 132b of the return gear 132 can be sequentially engaged with the return pinion 131 as shown in FIG. 18 and FIG. 19, and the return pinion 131 can be continuously rotated in the clockwise direction. Therefore, the return rack 130 engaged with the return pinion 131 can be moved in the direction of arrow F2, and the movable blade 26 can be forcibly returned from the cutting position P1 to the standby position P2. In this way, the state where the movable blade 26 overlaps the fixed blade 46 can be eliminated, and the paper clamping can be released. In addition, when the movable blade 26 is returned to the standby position P2 by the return pinion 131, the driving gear 71 also moves together with the return gear 130, so the driving pinion 78 rotates. At this time, as described above, the engagement between the two-stage intermediate car 77 and the driving intermediate car 76 is released, so the driving pinion 78 and the two-stage intermediate car 77 engaged therewith can be made to idle respectively. Therefore, the movable blade 26 can be returned to the standby position P2 without being affected by the driving pinion 78 and the two-stage intermediate car 77. Furthermore, by returning the movable blade 26 to the standby position P2, as shown in Fig. 19, the rack teeth 130a and 130b of the return gear 130 are removed from the return pinion 131. Therefore, in the stage of returning the movable blade 26 to the standby position P2 to release the paper clamp, the engagement between the rack teeth 130a and 130b of the return gear 130 and the return pinion 131 can be released. Furthermore, as shown in FIG. 19 , when the movable blade 26 returns to the standby position P2, the operating lever protrusion 112 of the operating lever 28 contacts the engaging wall 146 of the lock arm 140, and applies an external force to the lock arm 140 through the engaging wall 146. As a result, the lock arm 140 can be pushed up, and the lock arm 140 can be swung around the swing axis O2 from the stage unit 6 side to the head unit 5 side against the pushing force of the third push member 160. Therefore, the lock claw 145 can be gradually separated from the stage bearing 51 as the lock arm 140 swings. Furthermore, by further operating the operating lever 28 and moving it to the unlocking position P5 as shown in FIG. 20 , the locking arm 140 can be retracted from the receiving groove 62 to the head unit 5 side, and the locking claw 145 can be moved away from the stage bearing 51 to open the opening 62a. In this way, the stage bearing 51 can be allowed to be disengaged from the receiving groove 62. Furthermore, in conjunction with the operation of the aforementioned locking arm 140, as shown in FIG. 20 , the stage bearing 51 can be pushed up from the groove bottom 62b of the receiving groove 62 to the opening 62a side by the pushing arm 147. In particular, when the operating lever 28 reaches the unlocking position P5, as shown in FIG. 20, the stage bearing 51 can be pushed up by the push-up arm 147 so that the roller center of the stage roller 45 moves toward the opening 62a side from the apex 63a of the guide protrusion 63. In addition, the other locking arm 150 can be operated in synchronization with the locking arm 140 through the connecting shaft 141, so it can also be operated in the same manner as described above. Therefore, by placing the operating lever 28 at the unlocking position P5, the stage locking mechanism 30 can be used to switch the stage roller 45 to the unlocking state, and the head unit 5 and the stage unit 6 can be separated. Therefore, the printer cover 3 mounted on the stage unit 6 can be opened. As described above, the printing unit 4 and the thermal printer 1 according to the present embodiment can prevent the stage bearing 51 from being disengaged from the receiving groove 62 by using the locking arms 140 and 150, so that the stage roller 45 can be locked reliably. Furthermore, the locking arms 140 and 150 are pushed by the third push member 160 in a manner to maintain the locked state, so that the locking state can be prevented from being released due to accidental swinging around the swing axis O2. Furthermore, in conjunction with the operation of the operating lever 28, not only the locking arms 140 and 150 are retracted from the receiving groove 62, but also the stage bearing 51 can be forcibly pushed up toward the opening 62a by the push-up arm 147, so that the stage roller 45 can be disengaged from the receiving groove 62 without being affected by the push-up force of the third push-up member 160. Therefore, it is not necessary to operate the operating lever 28 with excessive force, and only a slight operating force is required to release the lock of the stage roller 45, so that the head unit 5 and the stage unit 6 can be separated smoothly. Furthermore, when the stage roller 45 is unlocked, unlike the conventional method, the locking arms 140 and 150 are swung from the stage unit 6 side to the head unit 5 side, so there is no need to ensure a movable space on the stage unit 6 side for the locking arms 140 and 150 to move. Therefore, the stage unit 6 can be made small and thin, and the overall size of the printing unit 4 can be made compact. Furthermore, since the locking arms 140 and 150 are used to press the stage bearing 51, it is not easy to cause the problem of so-called one-sided locking (one-sided lifting) in which one of the stage bearings 51 is locked but the other stage bearing 51 is not locked or is not locked sufficiently. Therefore, it is not necessary to add a mechanism for preventing one-sided locking, and the design can be simplified. In addition, since the locking arms 140 and 150 and the push-up arm 147 are formed as one component, the number of parts can be reduced, which contributes to the simplification of the structure. In addition, when the stage bearing 51 is pushed up by the push-up arm 147, the push-up arm 147 forcibly pushes up the stage bearing 51 to a large extent so that the roller center of the stage roller 45 moves toward the opening 62a side from the apex 63a of the guide protrusion 63. Therefore, the stage bearing 51 can be pushed up to the vicinity of the opening 62a of the receiving groove 62 and transferred to a state of being almost separated, thereby making it easier to separate the head unit 5 and the stage unit 6. In addition, since the return mechanism 29 is provided, even if a paper jam occurs between the fixed blade 46 and the movable blade 26 and the movable blade 26 stops at the cutting position P1 due to the paper jam, the paper jam can be released by operating the operating lever 28, and then the lock of the stage roller 45 can be released. Therefore, it is possible to obtain a very easy-to-use printing unit 4 and thermal printer 1. In particular, as the operating lever 28 is operated from the locking position P3 to the unlocking position P5, the paper clamping can be released and the stage roller 45 can be unlocked in a series of processes, so that the printing unit 4 and the thermal printer 1 that are easier to use can be obtained. In addition, since the speed increasing mechanism 136 using the planetary gear 134 is provided, the rotation amount of the return gear 132 for the operating stroke of the operating lever 28 can be ensured to be large. Therefore, the rotation amount of the return gear 132 required for returning the movable blade 26 to the standby position P2 side can be ensured in a state where the operating stroke of the operating lever 28 is suppressed to be small. Thereby, good operability of the operating lever 28 can be ensured. Furthermore, the return gear 132 of this embodiment can make the gear tooth portion 132b that first engages with the return pinion 131 retreat to the inner side of the radial direction of the return gear 132. Therefore, the gear tooth portion 132b can more surely engage with the return pinion 131. This point will be briefly described. For example, as shown in FIG17 , when the gear tooth portion 132b of the return gear 132 is engaged with the return pinion 131, the pinion tooth top 131a of the return pinion 131 abuts against the gear tooth top 132b of the gear tooth portion, and the rotation of the return gear 132 may be blocked by the return pinion 131. However, even in such a case, the gear tooth portion 132b can be retracted to the inner side of the radial direction of the return gear 132 by the elastic deformation of the elastic arm portion 132c. Thus, the gear tooth portion 132b can be moved in a manner that passes over the tooth top 131a of the small gear tooth as the return gear 132 rotates. Therefore, after passing over the tooth top 131a of the small gear tooth, the gear tooth portion 132b can be returned to its original position from the retreat position by the elastic restoring force of the elastic arm portion 132c. Therefore, the gear tooth portion 132b can be engaged with the next small gear tooth. Next, other embodiments of the present invention will be described based on the drawings. In addition, in this embodiment, the same symbols are given to the same components as those in the aforementioned embodiment, and their descriptions are omitted. Therefore, only the differences from the aforementioned embodiments will be described here. Figures 21 to 24 show the side of one side of the thermal printer of other embodiments of the present invention. Specifically, Figure 21 is a diagram of a thermal printer of other embodiments of the present invention, and is a side view observed from the direction of arrow A shown in Figure 5. Figure 22 is a side view showing a state in which the locking arm is removed from the state shown in Figure 21. Figure 23 is a three-dimensional view of each mechanism shown in Figure 21. Figure 24 is a three-dimensional view showing a state in which the locking arm is removed from the state shown in Figure 23. In addition, Figures 25 to 29 show the other side of the thermal printer of other embodiments of the present invention. Specifically, Fig. 25 is a side view showing the periphery of the other locking arm in the thermal printer of other embodiments of the present invention. Fig. 26 is a side view showing a state where the other locking arm is removed from the state shown in Fig. 25. Fig. 27 is a three-dimensional view of each mechanism shown in Fig. 25. Fig. 28 is a three-dimensional view showing a state where the other locking arm is removed from the state shown in Fig. 27. Fig. 29 is an enlarged view of a particular portion of the locking arm shown in Fig. 25. As shown in Figs. 21 to 24, a surrounding wall 170 is vertically provided on the side wall portion 60 of one side of the head frame 20, surrounding the driving intermediate vehicle 76 except for the periphery of the engaging portion. On the other hand, although not shown, a shaft portion having the same shape as the surrounding wall 170 is formed on the inner surface of the gear cover 22 mounted on the side wall portion 60 at a position corresponding to the surrounding wall 170. This can improve the positioning accuracy when the gear cover 22 is mounted on the side wall portion 60. In addition, the locking claw portion 145A of the pair of locking arms 140A and 150A of this embodiment has a different shape from the locking claw portion 145 of the locking arms 140 and 150 of the above-mentioned embodiment. As shown in FIG. 29 , the locking claw 145A has a straight line disengagement prevention surface 148A for preventing the stage bearing 51 from disengaging from the receiving groove 62 connected to the opening 62a in the locked state. In addition, a line L1 passing through the center of the stage bearing 51 from the rotation center O3 of the locking arm 150A is perpendicular to the disengagement prevention surface 148A (S1). The shape characteristics of the locking claw 145A are the same as those of the locking arm 140A. As described above, the stage locking mechanism 30 of the present embodiment is configured such that a line passing through the center O2 of the stage bearing 51 from the rotation center of the locking arms 140A and 150A is perpendicular to the bearing holding surface S1 of the locking claw portion 145A formed on the locking arms 140A and 150A. Thus, even when the stage roller 45 is pulled away from the receiving groove 62 by an external force in the locked state, a force that moves the locking arms 140A and 150A in the release direction (i.e., away from the stage bearing 51) is not generated, so that the stage roller 45 can be prevented from being separated. In addition, the left and right side walls 60 and 61 of this embodiment are provided with stage support springs 180 and 190 composed of special-shaped springs (wire springs) or the like. The stage support springs 180 and 190 are push-up members that assist in keeping the stage bearing 51 in the receiving groove 62. As shown in FIGS. 21 to 24, the stage support spring 180 is disposed between the side wall portion 60 on one side and the locking arm 140A. A mountain-shaped bearing pressing portion 181 is formed on one end side of the stage support spring 180 to press the stage bearing 51 in the receiving groove 62 in a direction in which it does not come off. The other end side of the stage support spring 180 is bent around the connecting shaft portion 141, and the other end portion 182 is locked to the side wall portion 60 through the locking portion 171 formed on the side wall portion 60. As shown in FIGS. 25 to 29, the stage support spring 190 is disposed between the side wall portion 61 on the other side and the locking arm 150A. A mountain-shaped bearing pressing portion 191 is formed on one end of the stage support spring 190 to press the stage bearing 51 in the receiving groove 62 in a direction that does not disengage. The other end of the stage support spring 190 is bent around the connecting shaft 141, and the other end 192 is locked to the side wall 61 through the locking hole 172 formed in the side wall 61. According to the stage support springs 180 and 190 constructed as described above, the bearing pressing portions 181 and 191 continuously push the stage bearing 51 in the receiving groove 62 toward the groove bottom 62b, thereby assisting in holding the stage roller 45. Thus, even if there is a gap between the disengagement prevention surface 148A of the locking arms 140A and 150A and the stage bearing 51 in the locked state, the looseness caused by the gap can be absorbed and the stage bearing 51 can be held. Therefore, the design tolerance of the locking arms 140A and 150A can be kept to allow for smooth swinging of the locking arms 140A and 150A, and the stage bearing 51 can be reliably prevented from disengaging by the disengagement prevention surface 148A. Furthermore, since the bearing pressing parts 181 and 191 of the stage support springs 180 and 190 are formed in a mountain shape, the stage roller 45 will not be excessively hindered from disengaging. Next, other variations of the present invention will be described based on the drawings. In this variation, the same symbols are given to the same components as those in the above-mentioned embodiment, and their description is omitted, and the description is mainly focused on the differences from the above-mentioned embodiment. Specifically, the following description is directed to the situation that as the operating rod 28 moves from the locking position P3 to the unlocking position P5, the stage support spring 180 on the operating rod 28 side swings in the direction of releasing the holding of the stage bearing 51, thereby allowing the stage bearing 51 to be disengaged from the receiving groove 62 connected to the opening 62a. FIG. 30 is a diagram showing a thermal printer of a modified example of another embodiment of the present invention, and is a partial three-dimensional diagram of the peripheral portion of the operating rod observed from the inner side. In FIG. 30, some components are omitted in order to facilitate observation of the configuration different from the aforementioned embodiment, but the omitted components are actually the same as those in the aforementioned embodiment. As shown in FIG. 30 , a hub-shaped protrusion 96 is formed on the inner side surface of the swing plate 90. When the swing plate 90 swings, one end 183 of the stage support spring 180 abuts against the protrusion 96. Therefore, when the swing plate 90 swings due to the pressing operation of the operating lever 28, one end 183 of the stage support spring 180 and the bearing pressing portion 181 are linked thereto and pushed up to the opposite side of the stage bearing 51. This series of actions will be explained with reference to FIGS. 31 to 33 . In addition, in FIGS. 31 to 33 , some components are omitted to facilitate observation of the configuration different from the aforementioned embodiment, but the omitted components actually exist in the same manner as in the aforementioned embodiment. FIG. 31A is a partial side view showing the first stage (locked state) of a modification of another embodiment of the present invention, and is a partial side view observed from the outer side of the operating rod 28. FIG. 31B is a partial side view showing the first stage (locked state) shown in FIG. 31A as viewed from the inner side of the operating rod 28. FIG. 32A is a partial side view showing the second stage (intermediate state) of the operation of pressing and moving the operating rod from the state shown in FIG. 31A. FIG. 32B is a partial side view showing the second stage (intermediate state) shown in FIG. 32A as viewed from the inner side of the operating rod. FIG. 33A is a partial side view showing a third stage (unlocked state) of the operation of pressing and moving the operating lever from the state shown in FIG. 32A. FIG. 33B is a partial side view showing a third stage (unlocked state) shown in FIG. 33A as viewed from the inner side of the operating lever. As shown in FIG. 31A, in the first stage (locked state), the engaging pin 95 formed on the second plate portion 93 of the swing plate 90 does not abut against the push-up cam 113 of the operating lever plate 110 formed on the operating lever 28. Furthermore, as shown in FIG. 31B, the protrusion 96 of the swing plate 90 does not abut against one end portion 183 of the stage support spring 180. Therefore, in the first stage (locked state), the bearing pressing portion 181 of the stage support spring 180 continuously pushes the stage bearing 51 in the receiving groove 62 toward the groove bottom 62b, thereby assisting in holding the stage roller 45. As shown in FIG32A, in the second stage (intermediate state), by the pressing operation of the operating lever 28, the engaging pin 95 of the swing plate 90 and the push-up cam 113 of the operating lever 28 come into contact. Furthermore, by further pressing the operating lever 28, the swing plate 90 swings in the direction of the arrow X in FIG32B with the pinion support shaft 81 inserted into the insertion hole 91 as the center. As shown in FIG. 32B , as the swing plate 90 swings, the protrusion 96 contacts one end 183 of the stage support spring 180, and the side of one end 183 of the stage support spring 180 is pressed away from the stage bearing 51. As a result, the bearing pressing portion 181 of the stage support spring 180 retreats away from the stage bearing 51 in the receiving groove 62, thereby opening a disengagement path for the stage bearing 51. As shown in FIG. 33A , in the third stage (unlocked state), the operating lever 28 is pressed further than in the state shown in FIG. 32A and FIG. 32B , whereby the locking arm 140A swings in the direction of retreating from the receiving groove 62, and the push-up arm 147 forcibly pushes the stage bearing 51 toward the opening 62a. At this time, the stage support spring 180 that assists in holding the stage roller 45 in the locked state has retreated from the receiving groove 62 in the aforementioned second stage (intermediate state), so that the stage bearing 51 in the receiving groove 62 can be smoothly disengaged through the opening 62a. As described above, according to the present modification, by providing the stage support spring 180 that assists in holding the stage roller 45, even if there is a gap between the disengagement prevention surface 148A of the lock arm 140A and the stage bearing 51 in the locked state, the looseness caused by the gap can be absorbed and the stage bearing 51 can be held. Furthermore, when the lock is released, before the push-up arm 147 pushes up the stage bearing 51, the stage support spring 180 releases the holding of the stage bearing 51 and swings in the direction of retreating from the receiving groove 62, so that the stage roller 45 can be smoothly disengaged. Therefore, the pressing force of the operating lever 28 required to open the carrier roller 45 can be reduced, and the operability can be improved. Although the above is a description of the implementation forms of the present invention, these implementation forms are only shown as examples and do not limit the scope of the invention. The implementation forms can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the main purpose of the present invention. The implementation forms and their variations include, for example, those that can be easily conceived by a person with ordinary knowledge in the technical field to which the invention belongs, those that are substantially the same, and those in the same scope. For example, in the above-mentioned embodiment, the fixed blade 46 is provided on the printer cover 3 (specifically, the stage unit 6), and the movable blade 26 is provided on the housing 2 (specifically, the head unit 5), but the present invention is not limited thereto. For example, the fixed blade 46 may be provided on the housing 2 side, and the movable blade 26 may be provided on the printer cover 3 side. However, as in the above-mentioned embodiment, by providing the fixed blade 46 on the printer cover 3, it is not necessary to provide the driving mechanism 27 for driving the movable blade 26 on the printer cover 3, so that the printer cover 3 can be made lighter, and the printer cover 3 can be ensured to have good opening and closing operability. Furthermore, in the aforementioned embodiment, the fixed blade 46 is kept in a fixed state, and the movable blade 26 is returned to the standby position P2 by the operating rod 28 to remove the paper jam, but the invention is not limited thereto. For example, the fixed blade 46 may be configured to be away from the movable blade 26 when the movable blade 26 is returned to the standby position P2 by the operating rod 28. In this case, for example, the fixed blade 46 may be configured to be away from the movable blade 26 by the operating rod 28. Furthermore, in the aforementioned embodiment, the operating rod 28 is configured to be linked to the rotating action of the operating rod 19 provided on the housing 2, but the invention is not limited thereto. For example, the front end of the operating rod 28 may be exposed outside the housing 2, so that the operating rod 28 can be directly operated from the outside of the housing 2. In addition, in the above-mentioned embodiment, the example in which the speed increasing mechanism 136 is composed of the sun gear 133, the planetary gear 134 and the inner gear 135 is described, but for example, the speed increasing mechanism 136 may be composed of other structures. In addition, in the above-mentioned embodiment, although the case of having the return mechanism 29 is cited as an example for description, the return mechanism 29 is not necessary and may not be provided. Moreover, even if the return mechanism 29 is provided, other structures may be adopted. Furthermore, although in the aforementioned embodiment, a pair of locking arms 140, 150 are used to press both sides of a pair of carrier bearings 51, the present invention is not limited thereto, and a single locking arm may be used to press at least one of the carrier bearings 51.

P:記錄紙 P1:切斷位置 P2:待命位置 P3:鎖定位置 P4:嚙合解除位置 P5:解除鎖定位置 O1:旋轉軸線 O2:擺動軸線 O3:旋轉中心 S:設置面 1:熱列印機 2:殼體(列印機本體) 3:列印機罩 3a:操作按鈕 4:列印單元 5:頭部單元 6:載台單元 10:外面 11:底面 12:頂面 13:前面 14:後面 15:側面 16:記錄紙收納部 17:旋轉軸部 18:排出口 19:操作桿 19a:連結體 20:頭部框架 21:頭部罩板 22,23:齒輪罩 25:熱感頭 26:可動刀刃 26a:刀尖 27:驅動機構 28:操作桿 29:回歸機構 30:載台鎖定機構 40:載台框架 41:載台罩板 45:載台滾輪 46:固定刀刃 46a:刀尖 47:載台收納空間 48:支承壁 50:載台軸 51:載台軸承 52:從動齒輪 60,61:側壁部 62:收容溝 62a:開放口 62b:溝底部 63:引導突起 63a:頂點部 70:可動刀刃夾具 71:驅動齒條 71a:驅動齒條齒 75:驅動用馬達 75a:減速機構 75b:輸出軸 76:驅動中間車 77:二段中間車 77a:大徑中間車 77b:小徑中間車 78:驅動小齒輪 80:中間支承軸 81:小齒輪支承軸 90:擺動板 91:插通孔 92:第1板部 93:第2板部 94:卡止突起 95:卡合銷 96:突起部 100:第1推彈構件 100a:線圈部 100b:第1線圈端部 100c:第2線圈端部 105:線圈支承軸 106:操作桿支承軸 110:操作桿板 111:行星軸 112:操作桿突部 113:推起凸輪 114:限制突片 115:卡止突起 116:限制壁部 117:限制壁部 120:第2推彈構件 120a:線圈部 120b:第1線圈端部 120c:第2線圈端部 130:回歸齒條 130a,130b:齒條齒 131:回歸小齒輪 131a:齒頂 132:回歸齒輪 132a:齒輪托板 132b:齒輪齒部 132c:彈性臂部 133:太陽齒輪 134:行星齒輪 135:內齒輪 136:增速機構 139:齒條臂 140,140A,150,150A:鎖定臂 141:連結軸部 145,145A:鎖定爪部 145b:引導面 146:卡合壁部 147:推起臂 147a:推動面 148A:脫離防止面 151:卡止突起 160:第3推彈構件(推彈構件) 160a:線圈部 160b:第1線圈端部 160c:第2線圈端部 170:圍繞壁 171:卡止部 172:卡止孔 180,190:載台支承彈簧 181,191:軸承按壓部 182:另一端部 183:其中一端部 192:另一端部P: Recording paper P1: Cutting position P2: Standby position P3: Lock position P4: Engagement release position P5: Unlock position O1: Rotation axis O2: Swing axis O3: Rotation center S: Installation surface 1: Thermal printer 2: Casing (printer body) 3: Printer cover 3a: Operation button 4: Printing unit 5: Head unit 6: Carrier unit 10: Outside 11: Bottom 12: Top 13: Front 14: Back 15: Side 16: Recording paper storage 17: Rotating shaft 18: Discharge port 19: Operating lever 19a: Connector 20: Head frame 21: Head cover 22,23: Gear cover 25: Thermal head 26: Movable blade 26a: Blade tip 27: Driving mechanism 28: Operating lever 29: Return mechanism 30: stage locking mechanism 40: stage frame 41: stage cover 45: stage roller 46: fixed blade 46a: blade tip 47: stage storage space 48: support wall 50: stage shaft 51: stage bearing 52: driven gear 60,61: side wall 62: storage groove 62a: opening 62b: groove bottom 63: guide protrusion 63a: apex 70 : Movable blade fixture 71: Driving gear 71a: Driving gear teeth 75: Driving motor 75a: Speed reduction mechanism 75b: Output shaft 76: Driving intermediate car 77: Two-stage intermediate car 77a: Large diameter intermediate car 77b: Small diameter intermediate car 78: Driving pinion 80: Intermediate support shaft 81: Pinion support shaft 90: Swing plate 91: Insertion hole 92: First plate part 9 3: Second plate part 94: Locking protrusion 95: Locking pin 96: Protrusion 100: First ejection member 100a: Coil part 100b: First coil end 100c: Second coil end 105: Coil support shaft 106: Operating lever support shaft 110: Operating lever plate 111: Planetary shaft 112: Operating lever protrusion 113: Push-up cam 114: Limiting protrusion 1 15: locking protrusion 116: limiting wall 117: limiting wall 120: second push-pull member 120a: coil part 120b: first coil end 120c: second coil end 130: return gear 130a, 130b: gear teeth 131: return pinion 131a: gear top 132: return gear 132a: gear support plate 132b: gear teeth 1 32c: Elastic arm 133: Sun gear 134: Planetary gear 135: Inner gear 136: Speed increasing mechanism 139: Gear arm 140,140A,150,150A: Locking arm 141: Connecting shaft 145,145A: Locking claw 145b: Guide surface 146: Engagement wall 147: Push arm 147a: Pushing surface 148A: Disengagement prevention Surface 151: locking protrusion 160: third push-spring member (push-spring member) 160a: coil part 160b: first coil end 160c: second coil end 170: surrounding wall 171: locking part 172: locking hole 180,190: carrier support spring 181,191: bearing pressing part 182: other end 183: one end 192: other end

[圖1]係本發明的實施形態之熱列印機的立體圖，且係表示將列印機罩關閉的狀態的立體圖。 [圖2]係圖1所示之列印機罩開啟的狀態之熱列印機的立體圖。 [圖3]係圖2所示之列印單元的立體圖。 [圖4]係從圖3所示之狀態去除齒輪罩等的狀態之列印單元的立體圖。 [圖5]係表示從圖4所示之狀態去除載台框架等的狀態之列印單元的立體圖。 [圖6]係圖4所示之載台單元的立體圖。 [圖7]係從圖5所示之箭號A方向觀察之側視圖，且係表示收容溝與載台軸承的關係的圖。 [圖8]係表示在固定刀刃與可動刀刃之間切斷記錄紙的狀態的立體圖。 [圖9]係從圖5所示之箭號A方向觀察的側視圖。 [圖10]係圖9所示之各機構的立體圖。 [圖11]係從相反側觀察圖10所示之操作桿的周邊的立體圖。 [圖12]係從圖11所示之狀態去除操作桿的狀態的立體圖。 [圖13]係表示從圖10所示之狀態去除操作桿的狀態的立體圖。 [圖14]係表示另一方之鎖定臂的周邊的側視圖。 [圖15]係表示從圖9所示之狀態在可動刀刃與固定刀刃之間發生夾紙的狀態的側視圖。 [圖16]係表示從圖15所示之鎖定位置將操作桿進行按壓移動的操作的狀態的側視圖。 [圖17]係表示從圖16所示之狀態將操作桿進一步進行按下操作的狀態的側視圖。 [圖18]係表示從圖17所示之狀態將操作桿進一步進行按下操作而位於嚙合解除位置的狀態的側視圖。 [圖19]係表示從圖18所示之狀態將操作桿進一步進行按下操作而使可動刀刃回歸至待命位置的狀態的側視圖。 [圖20]係表示從圖19所示之狀態將操作桿進一步進行按下操作而位於解除鎖定位置，並將載台軸承推起至收容溝的開放口的狀態的側視圖。 [圖21]係表示本發明的其他實施形態之熱列印機的圖，且係從圖5所示之箭號A方向觀察的側視圖。 [圖22]係表示從圖21所示之狀態去除鎖定臂的狀態的側視圖。 [圖23]係圖21所示之各機構的立體圖。 [圖24]係表示從圖23所示之狀態去除鎖定臂的狀態的立體圖。 [圖25]係於本發明之其他實施形態之熱列印機中，表示另一方之鎖定臂的周邊的側視圖。 [圖26]係表示從圖25所示之狀態去除另一方之鎖定臂的狀態的側視圖。 [圖27]係圖25所示之各機構的立體圖。 [圖28]係表示從圖27所示之狀態去除另一方之鎖定臂的狀態的立體圖。 [圖29]係圖25所示之另一方之鎖定臂的特取部分放大圖。 [圖30]係表示本發明的其他實施形態之變形例之熱列印機的圖，且係從內側面觀察操作桿的周邊部的特取部分立體圖。 [圖31A]係表示本發明的其他實施形態之變形例之第1階段(鎖定狀態)，且係從操作桿的外側面觀察的特取部分側視圖。 [圖31B]係從操作桿的內側面觀察圖31A所示之第1階段(鎖定狀態)的特取部分側視圖。 [圖32A]係從圖31A所示之狀態將操作桿進行按壓移動的操作的第2階段(中間狀態)的特取部分側視圖。 [圖32B]係從操作桿的內側面觀察圖32A所示之第2階段(中間狀態)的特取部分側視圖。 [圖33A]係從圖32A所示之狀態將操作桿進行按壓移動的操作的第3階段(解除鎖定狀態)的特取部分側視圖。 [圖33B]係從操作桿的內側面觀察圖33A所示之第3階段(解除鎖定狀態)的特取部分側視圖。[FIG. 1] is a perspective view of a thermal printer of an embodiment of the present invention, and is a perspective view showing a state where the printer cover is closed. [FIG. 2] is a perspective view of the thermal printer shown in FIG. 1 with the printer cover opened. [FIG. 3] is a perspective view of the printing unit shown in FIG. 2. [FIG. 4] is a perspective view of the printing unit with the gear cover and the like removed from the state shown in FIG. 3. [FIG. 5] is a perspective view of the printing unit with the stage frame and the like removed from the state shown in FIG. 4. [FIG. 6] is a perspective view of the stage unit shown in FIG. 4. [FIG. 7] is a side view viewed from the direction of arrow A shown in FIG. 5, and is a view showing the relationship between the receiving groove and the stage bearing. [Figure 8] is a perspective view showing a state where the recording paper is cut between the fixed blade and the movable blade. [Figure 9] is a side view viewed from the direction of arrow A shown in Figure 5. [Figure 10] is a perspective view of each mechanism shown in Figure 9. [Figure 11] is a perspective view showing the periphery of the operating lever shown in Figure 10 from the opposite side. [Figure 12] is a perspective view showing a state where the operating lever is removed from the state shown in Figure 11. [Figure 13] is a perspective view showing a state where the operating lever is removed from the state shown in Figure 10. [Figure 14] is a side view showing the periphery of the other locking arm. [Figure 15] is a side view showing a state where paper is clamped between the movable blade and the fixed blade from the state shown in Figure 9. [FIG. 16] is a side view showing a state where the operating lever is pressed and moved from the locked position shown in FIG. 15. [FIG. 17] is a side view showing a state where the operating lever is further pressed from the state shown in FIG. 16. [FIG. 18] is a side view showing a state where the operating lever is further pressed from the state shown in FIG. 17 and is located in the engagement release position. [FIG. 19] is a side view showing a state where the operating lever is further pressed from the state shown in FIG. 18 and the movable blade is returned to the standby position. [FIG. 20] is a side view showing a state where the operating lever is further pressed from the state shown in FIG. 19 and is located in the unlocked position and the stage bearing is pushed up to the open mouth of the receiving groove. [Figure 21] is a diagram showing a thermal printer of another embodiment of the present invention, and is a side view viewed from the direction of arrow A shown in Figure 5. [Figure 22] is a side view showing a state where the locking arm is removed from the state shown in Figure 21. [Figure 23] is a three-dimensional view of each mechanism shown in Figure 21. [Figure 24] is a three-dimensional view showing a state where the locking arm is removed from the state shown in Figure 23. [Figure 25] is a side view showing the periphery of the other locking arm in the thermal printer of another embodiment of the present invention. [Figure 26] is a side view showing a state where the other locking arm is removed from the state shown in Figure 25. [Figure 27] is a three-dimensional view of each mechanism shown in Figure 25. [FIG. 28] is a perspective view showing a state where the other locking arm is removed from the state shown in FIG. 27. [FIG. 29] is an enlarged view of a particular portion of the other locking arm shown in FIG. 25. [FIG. 30] is a view showing a thermal printer of a modified example of another embodiment of the present invention, and is a perspective view of a particular portion of the peripheral portion of the operating rod as viewed from the inner side. [FIG. 31A] is a side view showing the first stage (locked state) of a modified example of another embodiment of the present invention, and is a side view of a particular portion as viewed from the outer side of the operating rod. [FIG. 31B] is a side view of a particular portion of the first stage (locked state) shown in FIG. 31A as viewed from the inner side of the operating rod. [FIG. 32A] is a partial side view showing a second stage (intermediate state) of the operation of pressing and moving the operating lever from the state shown in FIG. 31A. [FIG. 32B] is a partial side view showing a second stage (intermediate state) of FIG. 32A as viewed from the inner side of the operating lever. [FIG. 33A] is a partial side view showing a third stage (unlocked state) of the operation of pressing and moving the operating lever from the state shown in FIG. 32A. [FIG. 33B] is a partial side view showing a third stage (unlocked state) of FIG. 33A as viewed from the inner side of the operating lever.

5:頭部單元 5: Head unit

20:頭部框架 20: Head frame

23:齒輪罩 23: Gear cover

25:熱感頭 25: Thermal head

26:可動刀刃 26: Movable Blade

26a:刀尖 26a: Knife tip

27:驅動機構 27: Driving mechanism

28:操作桿 28: Operating lever

29:回歸機構 29: Return to the institution

30:載台鎖定機構 30: Stage locking mechanism

45:載台滾輪 45: Carrier roller

51:載台軸承 51: Carrier bearing

52:從動齒輪 52: Driven gear

60,61:側壁部 60,61: Side wall

62:收容溝 62: Reception trench

70:可動刀刃夾具 70: Movable blade clamp

71:驅動齒條 71: Drive gear

71a:驅動齒條齒 71a: Drive gear teeth

76:驅動中間車 76: Driving the intermediate car

77b:小徑中間車 77b: small path intermediate car

78:驅動小齒輪 78: Drive small gear

80:中間支承軸 80:Intermediate support shaft

81:小齒輪支承軸 81: Pinion support shaft

90:擺動板 90: Swing board

94:卡止突起 94: Locking protrusion

100:第1推彈構件 100: The first push-bullet component

105:線圈支承軸 105: Coil support shaft

106:操作桿支承軸 106: Operating rod support shaft

114:限制突片 114: Restriction tab

116:限制壁部 116: Restriction wall

120:第2推彈構件 120: Second push-pull member

130:回歸齒條 130: Return to the tooth bar

130a,130b:齒條齒 130a,130b: tooth bar teeth

131:回歸小齒輪 131: Return to small gear

132:回歸齒輪 132: Return gear

132b:齒輪齒部 132b: Gear teeth

132c:彈性臂部 132c: Elastic arm

134:行星齒輪 134: Planetary gear

139:齒條臂 139: Toothed arm

140,150:鎖定臂 140,150: Locking arm

145:鎖定爪部 145: Locking claw

P2:待命位置 P2: Standby position

P3:鎖定位置 P3: Lock position

O1:旋轉軸線 O1: Rotation axis

Claims (11)

一種列印單元，係具備：頭部單元，係具有對於記錄紙進行列印的熱感頭；載台單元，係具有將前述記錄紙送紙的載台滾輪，及以將前述載台滾輪的兩端部以能夠旋轉的方式分別軸支之一對載台軸承，且對於前述頭部單元以能夠分離的方式組合；操作桿，係能夠在對於前述頭部單元鎖定前述載台單元的鎖定位置與解除對於前述頭部單元之前述載台單元的鎖定的解除鎖定位置之間繞旋轉軸線移動；載台鎖定機構，係具有能夠繞與前述載台滾輪平行的擺動軸線擺動的鎖定臂，並能夠切換為鎖定前述載台滾輪的鎖定狀態及解除該鎖定的解除鎖定狀態；以及推彈構件，係以維持前述鎖定狀態的方式，將前述鎖定臂以繞前述擺動軸線的方式推彈；於前述頭部單元，形成有：一對收容溝，係能夠通過開放口將一對前述載台軸承嵌入至內部，且在前述操作桿位於前述鎖定位置時，將前述載台軸承以相接於溝底部的狀態收容，前述鎖定臂，係在前述操作桿位於前述鎖定位置時，從前述開放口側按壓收容於前述收容溝內之一對前述載台軸承的至少其中一方，且隨著前述操作桿從前述鎖定位置往前述解除鎖定位置側移動，而繞前述擺動軸線擺動，並能夠容許前述載台軸承通過前述開放口從前述收容溝內脫 離，於前述鎖定臂，形成有：推起臂，係隨著前述操作桿從前述鎖定位置往前述解除鎖定位置移動，將前述載台軸承從前述溝底部往前述開放口側推起，前述推彈構件，係將前述鎖定臂往前述載台單元側推彈，前述鎖定臂，隨著前述操作桿從前述鎖定位置往前述解除鎖定位置側移動，從前述載台單元側往前述頭部單元側繞前述擺動軸線擺動，並能夠容許前述載台軸承通過前述開放口從前述收容溝內脫離。 A printing unit comprises: a head unit having a thermal head for printing on recording paper; a stage unit having a stage roller for feeding the recording paper, and a pair of stage bearings for rotatably supporting both ends of the stage roller, and the head unit is assembled in a separable manner; an operating lever capable of being moved between a locking position for locking the stage unit with respect to the head unit and an unlocking position for unlocking the stage unit with respect to the head unit. The carrier locking mechanism has a locking arm that can swing around a swing axis parallel to the carrier roller and can be switched between a locking state for locking the carrier roller and an unlocking state for releasing the lock; and a push-pull member that pushes the locking arm around the swing axis in a manner to maintain the locking state; and a pair of receiving grooves are formed in the head unit, which can embed a pair of the carrier bearings into the interior through the opening, and at the position of the operating rod When the aforementioned locking position is set, the aforementioned stage bearing is received in a state of being in contact with the bottom of the groove. When the aforementioned operating rod is set in the aforementioned locking position, the aforementioned locking arm presses at least one of the pair of aforementioned stage bearings received in the aforementioned receiving groove from the aforementioned opening side, and swings around the aforementioned swing axis as the aforementioned operating rod moves from the aforementioned locking position to the aforementioned unlocking position side, and can allow the aforementioned stage bearing to be disengaged from the aforementioned receiving groove through the aforementioned opening. The aforementioned locking arm is formed with: The push-up arm pushes the carrier bearing from the bottom of the groove toward the opening as the operating rod moves from the locking position to the unlocking position. The push-up member pushes the locking arm toward the carrier unit. The locking arm swings around the swing axis from the carrier unit to the head unit as the operating rod moves from the locking position to the unlocking position, and allows the carrier bearing to be disengaged from the receiving groove through the opening. 如請求項1所述之列印單元，其中，前述推起臂，在前述操作桿位於前述鎖定位置時，對於前述載台軸承為非接觸。 A printing unit as described in claim 1, wherein the push-up arm is non-contact with the carrier bearing when the operating lever is in the locking position. 如請求項1所述之列印單元，其中，於前述收容溝的內側面，形成有：傾斜的引導突起，係開口寬度從前述開放口側往前述溝底部側逐漸縮窄，且將前述載台軸承往前述溝底部引導，前述推起臂，係以使前述載台滾輪的滾輪中心比前述引導突起的頂點部更往前述開放口側移動的方式將前述載台軸承推起。 The printing unit as described in claim 1, wherein an inclined guide protrusion is formed on the inner side surface of the receiving groove, the opening width of which gradually narrows from the opening side to the groove bottom side, and guides the carrier bearing to the groove bottom, and the push-up arm pushes up the carrier bearing in a manner that the roller center of the carrier roller moves further toward the opening side than the apex of the guide protrusion. 如請求項1所述之列印單元，其中，前述鎖定臂，係配置於隔著前述載台滾輪的兩側，並對應於一對前述載台軸承而設置有一對，前述載台鎖定機構，係具備：連結軸部，係沿著前述 擺動軸線延伸並且將一對前述鎖定臂彼此連結。 The printing unit as described in claim 1, wherein the locking arms are arranged on both sides of the carrier roller and are provided in pair corresponding to a pair of carrier bearings, and the carrier locking mechanism comprises: a connecting shaft extending along the swing axis and connecting the pair of locking arms to each other. 如請求項1所述之列印單元，其中，係具備：固定刀刃，係設置於前述頭部單元及前述載台單元當中之其中一方；可動刀刃，係設置於前述頭部單元及前述載台單元當中之另一方，並能夠對於前述固定刀刃相對移動；以及驅動機構，係具有連結至前述可動刀刃的驅動齒條，並使前述可動刀刃在遠離前述固定刀刃的待命位置與跨上前述固定刀刃的切斷位置之間移動。 The printing unit as described in claim 1, wherein the printing unit comprises: a fixed blade disposed on one of the head unit and the stage unit; a movable blade disposed on the other of the head unit and the stage unit and capable of moving relative to the fixed blade; and a driving mechanism having a driving tooth connected to the movable blade and moving the movable blade between a standby position away from the fixed blade and a cutting position straddling the fixed blade. 如請求項5所述之列印單元，其中，係具備：回歸機構，係在前述可動刀刃於前述切斷位置停止的狀態下，在前述載台鎖定機構利用伴隨於將前述操作桿從前述鎖定位置往前述解除鎖定位置的操作的操作力將前述載台滾輪切換為前述解除鎖定狀態之前，使前述可動刀刃從前述切斷位置往前述待命位置移動。 The printing unit as described in claim 5, wherein the printing unit comprises: a return mechanism, which moves the movable blade from the cutting position to the standby position before the stage locking mechanism switches the stage roller to the unlocked state by using the operating force accompanying the operation of the operating lever from the locking position to the unlocking position when the movable blade stops at the cutting position. 如請求項6所述之列印單元，其中，前述回歸機構，係具備：回歸齒條，係形成於前述驅動齒條；回歸小齒輪，係嚙合於前述回歸齒條的齒條齒；回歸齒輪及太陽齒輪，係在配置於與前述操作桿的前述旋轉軸線同軸上的狀態下，以能夠繞前述旋轉軸線旋轉的方式被支承； 行星齒輪，係嚙合於前述太陽齒輪，並且伴隨於前述操作桿的移動進行公轉；以及內齒輪，係嚙合於前述行星齒輪；前述回歸齒輪，係能夠與前述回歸小齒輪嚙合。 The printing unit as described in claim 6, wherein the return mechanism comprises: a return gear formed on the drive gear; a return pinion engaged with the tooth of the return gear; the return gear and the sun gear are arranged coaxially with the rotation axis of the operating rod and supported so as to be rotatable around the rotation axis; a planetary gear engaged with the sun gear and revolving with the movement of the operating rod; and an inner gear engaged with the planetary gear; the return gear is capable of engaging with the return pinion. 如請求項7所述之列印單元，其中，前述齒條齒，係以前述可動刀刃位於前述切斷位置時對於前述回歸小齒輪嚙合，且在前述可動刀刃位於前述待命位置時解除對於前述回歸小齒輪的嚙合的方式，形成於前述可動刀刃的刀尖的相反側。 The printing unit as described in claim 7, wherein the tooth bar is formed on the opposite side of the tip of the movable blade in such a manner that the movable blade is engaged with the return pinion when the movable blade is in the cutting position and is released from the return pinion when the movable blade is in the standby position. 如請求項1所述之列印單元，其中，前述鎖定臂，係具有：直線狀的脫離防止面，係防止前述載台軸承於前述鎖定狀態從連通於前述開放口的前述收容溝內脫離，從前述鎖定臂的旋轉中心通過前述載台軸承的中心的線與前述脫離防止面係垂直相交。 The printing unit as described in claim 1, wherein the locking arm has a linear disengagement prevention surface for preventing the carrier bearing from disengaging from the receiving groove connected to the opening in the locked state, and a line passing through the center of the carrier bearing from the rotation center of the locking arm is perpendicular to the disengagement prevention surface. 如請求項1所述之列印單元，其中，係具備：載台支承彈簧，係輔助使前述載台軸承被保持於前述收容溝內，前述載台支承彈簧，係在隨著前述操作桿從前述鎖定位置往前述解除鎖定位置側移動，前述推起臂將前述載台軸承推起之前，往解除前述載台軸承的保持的方向移動，容許前述載台軸承從連通於前述開放口的前述收容溝內脫離。 The printing unit as claimed in claim 1, wherein the printing unit comprises: a stage support spring, which assists in keeping the stage bearing in the receiving groove; the stage support spring moves in a direction of releasing the holding of the stage bearing before the push-up arm pushes up the stage bearing as the operating lever moves from the locking position to the unlocking position, thereby allowing the stage bearing to be disengaged from the receiving groove connected to the opening. 一種熱列印機，係具備：請求項1所述之列印單元；列印機本體，係具有收容前述記錄紙的記錄紙收納部，並且安裝有前述頭部單元及前述載台單元當中之其中一方的單元；以及列印機罩，係對於前述列印機本體以能夠轉動的方式連結，並安裝有前述頭部單元及前述載台單元當中之另一方。 A thermal printer comprises: the printing unit described in claim 1; a printer body having a recording paper storage portion for storing the recording paper and having one of the head unit and the stage unit installed thereon; and a printer cover rotatably connected to the printer body and having the other of the head unit and the stage unit installed thereon.
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