JP2006168850A - Recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording apparatus capable of transporting a recording sheet with a simple structure and high accuracy and capable of recording a high quality image over the entire recording sheet.
In a recording apparatus having a first conveying means and a second conveying means for conveying a recording medium, a first acting force varying means for changing an acting force on the recording medium by the first conveying means. A second acting force variable means for changing the acting force on the recording medium by the second transport means, a control means for controlling the first acting force variable means and the second acting force variable means, The control means controls so that the sum of the acting force on the recording medium by the first conveying means and the acting force on the recording medium by the second conveying means is always substantially constant.
[Selection] Figure 1

Description

  The present invention relates to an ink jet recording apparatus for recording input information on a recording sheet, such as a personal computer (personal computer), a word processor, an electronic typewriter, and a facsimile machine.

  In recent years, with the spread of personal computers to general households, the spread of recording devices for recording on recording media is also remarkable. As recording apparatuses, apparatuses capable of recording a general photographic image on a sheet of paper to a photographic image comparable to a silver halide photograph are widespread, and the progress is remarkable.

  In particular, an image quality improvement of an ink jet recording apparatus that forms an image by ejecting ink onto a recording medium is remarkable, and various improvements have been made to reproduce an image quality equivalent to a photograph. For example, to reduce the size of the ejected ink droplets to reduce graininess, improve the so-called resolution of arranging the ink droplets at a fine pitch, and to achieve a photographic finish, I have prepared a recording medium with a feeling.

As another conventional example, Patent Document 1 can be cited.
Japanese Patent Laid-Open No. 03-279134

  In order to accurately form such small ink droplets on a recording medium at a fine pitch, the ejection performance of the recording head that ejects ink is improved, and the carriage that scans the recording head is accurately driven. It is important to let Another important factor is to accurately convey the recording medium.

  In the case of an inkjet recording apparatus, from a conveyance roller pair composed of a conveyance roller and a pinch roller that presses against the conveyance roller, a discharge roller for conveying a recording sheet after recording in the discharge direction, and a spur that presses against the discharge roller In general, the recording sheet is conveyed by using two pairs of discharge rollers.

  In that case, the leading end of the recording sheet is first transported by a pair of transport rollers, and when the recording proceeds, the leading end reaches the pair of discharge rollers. Thereafter, the recording sheet is conveyed while being sandwiched between both the conveying roller pair and the discharging roller pair until the trailing edge of the recording sheet passes through the conveying roller pair.

  As mentioned above, the conveyance accuracy of the recording sheet is also very important to achieve high image quality. For example, the conveyance roller material can be changed from rubber to a coating roller with particles coated on a metal shaft. It is supposed to be.

  Further, the pressure of the pinch roller that presses against the transport roller is also increased, and the recording sheet is sandwiched between the transport roller and the pinch roller.

  On the other hand, the pressure of the spur that presses against the discharge roller is not so high.

  In addition, the conveyance amount of the discharge roller pair is slightly larger than the conveyance amount of the conveyance roller pair, and as described above, the recording sheet is sandwiched between both the conveyance roller pair and the discharge roller pair. This is because the recording sheet can be transported without being bent between the transport roller pair and the discharge roller pair when transported.

  Here, the pressure of the spur that presses against the discharge roller is not increased because the recording sheet is conveyed when the recording sheet is conveyed between both the conveying roller pair and the discharging roller pair as described above. This is because the conveyance amount of the discharge roller pair is not increased because the conveyance amount of the discharge roller pair is larger than the conveyance amount of the conveyance roller pair so as not to bend. If the conveying force of the discharge roller pair is increased, the conveying accuracy of the conveying roller pair is affected, and the conveying accuracy is deteriorated.

  However, since such a configuration is adopted, the conveyance accuracy when the recording sheet is conveyed only by the discharge roller pair becomes worse than when the recording sheet is conveyed only by the conveyance roller pair. That is, if the trailing edge of the recording sheet passes through the conveying roller pair and is conveyed only by the discharge roller pair, the conveying accuracy is deteriorated. Therefore, when the trailing edge of the recording sheet passes through the pair of transport rollers and is transported by only the pair of discharge rollers, processing is performed to prevent deterioration in transport accuracy by reducing the amount of one line feed. Yes. However, if the amount of line feed for one line feed is reduced, the number of line feeds increases accordingly, so that the recording time, so-called throughput, is lowered.

  In a recording apparatus having a recording means for forming an image on a recording medium, and a first conveying means and a second conveying means for conveying the recording medium, the first conveying means acts on the recording medium. A first acting force variable means for changing the force; a second acting force variable means for changing the acting force on the recording medium by the second transport means; the first acting force variable means; Control means for controlling the second acting force variable means, the controlling means acting on the recording medium by the first conveying means and acting force on the recording medium by the second conveying means. Is controlled so that the sum of is always substantially constant.

  The first conveying means presses the pinch roller against the conveying roller to sandwich the recording medium and conveys the recording medium, and the first acting force varying means changes the pressing force of the pinch roller to the conveying roller. It is configured as follows.

  The second conveying means presses a spur against the paper discharge roller to sandwich and feed the recording medium, and the second acting force variable means changes the pressing force of the spur to the paper discharge roller. It is configured as follows.

  The control means controls the first acting force variable means and the second acting force variable means to gradually operate.

  According to the present invention, since a recording sheet can be conveyed with a simple configuration with high accuracy, a recording apparatus capable of recording a high-quality image over the entire recording sheet can be provided.

(First embodiment)
The configuration of a recording apparatus to which the present invention is applied will be described with reference to FIGS.

(A) Paper Feed Unit The paper feed unit 2 returns the pressure plate 21 on which the sheet material P is stacked, the paper feed roller 28 that feeds the sheet material P, the separation roller 24 that separates the sheet material P, and the sheet material P to the stacking position. Therefore, the return lever 22 and the like are attached to the base 20. (Fig. 5)
A paper feed tray 26 for holding the stacked sheet material P is attached to the base 20 or the exterior. The paper feed tray 26 is a multistage type and is rotated when used. (Figure 2)
The paper feed roller 28 has a bar shape with a circular arc in cross section. One separation roller rubber is provided based on the paper standard, thereby feeding the sheet material. The drive to the paper feed roller 28 is transmitted from a dedicated ASF motor E0105 provided in the paper feed unit 2 by a drive transmission gear 27a and a planetary gear 27b (not shown).

  A movable side guide 23 is movably provided on the pressure plate 21 to regulate the stacking position of the sheet material P. The pressure plate 21 can rotate around a rotation shaft coupled to the base 20 and is urged by the pressure plate spring 21 a to the paper feed roller 28. A separation sheet 21b made of a material having a large friction coefficient such as an artificial leather that prevents double feeding of the sheet material P near the end of the stack is provided at a portion of the pressure plate 21 that faces the sheet feeding roller 28. The pressure plate 21 is configured to be able to contact and separate from the paper feed roller 28 by a pressure plate cam 21c (not shown).

  Further, a separation roller holder 24 to which a separation roller 24a for separating the sheet material P one by one is attached to the base 20 is rotatable about a rotation shaft provided on the base 20, and a separation roller spring (not shown) is provided. The paper is fed to the paper feed roller 28 by M24b. The separation roller 24a is configured such that a clutch spring 24c (not shown) is attached, and a portion to which the separation roller 24a is attached can rotate when a load exceeding a predetermined value is applied. The separation roller 24a is configured to be able to contact and separate from the paper feed roller 28 by a separation roller release shaft M204d and a control cam 25 (not shown). The positions of the pressure plate 21, the return lever 22, and the separation roller 24a are detected by the ASF sensor E0009.

  The return lever 22 for returning the sheet material P to the stacking position is rotatably attached to the base 20 and is urged by a return lever spring 22a (not shown) in the release direction. When the sheet material P is returned, it is configured to rotate by the control cam 25.

  A state of feeding paper using the above configuration will be described below.

  In a normal standby state, the pressure plate 21 is released by the pressure plate cam 21c, the separation roller 24a is released by the control cam 25, and the return lever 22 returns the sheet material P so that the sheet material P does not enter the back during loading. It is provided at a loading position that closes the loading port. When paper feeding starts from this state, first, the separation roller 24a comes into contact with the paper feeding roller 28 by driving the motor. Then, the return lever 22 is released, and the pressure plate 21 comes into contact with the paper feed roller 28. In this state, feeding of the sheet material P is started. The sheet material P is limited by a front-stage separation unit 20a (not shown) provided on the base 20, and only a predetermined number of the sheet material P is sent to a nip portion composed of a sheet feeding roller 28 and a separation roller 24a. The fed sheet material P is separated at the nip portion, and only the uppermost sheet material P is conveyed.

  When the sheet material P reaches a conveying roller 36 and a pinch roller 37 described later, the pressure plate 21 is released by a pressure plate cam 21c (not shown) and the separation roller 24a is released by a control cam 25. The return lever 22 is returned to the loading position by the control cam 25. At this time, the sheet material P that has reached the nip portion constituted by the paper feed roller 28 and the separation roller 24a can be returned to the stacking position.

(B) Paper Conveying Unit Next, a conveyance roller 36 for conveying the sheet material P and a PE sensor E0007 are rotatably attached to the chassis 11 made of a bent metal sheet. The transport roller 36 has a configuration in which ceramic fine particles are coated on the surface of a metal shaft, and metal portions of both shafts are received by a bearing 38 (not shown) and attached to the chassis 11. A conveyance roller tension spring 38a is provided between the bearing 38 and the conveyance roller 36 in order to apply a load during rotation to the conveyance roller 36 so that stable conveyance is performed. Giving.

  The conveyance roller 36 is provided with a plurality of driven pinch rollers 37 in contact therewith. The pinch roller 37 is held by the pinch roller holder 30 and is urged by the pinch roller spring 30 a, so that the pinch roller 37 is pressed against the transport roller 36 and generates the transport force of the sheet material P. At this time, the rotating shaft of the pinch roller holder 30 is attached to the bearing of the chassis 11 and rotates around the shaft. As shown in FIG. 6, a pinch roller cam 37a is rotatably supported by the chassis 11 at the end of the pinch roller spring 30a opposite to the pinch roller, and is rotated by a driving source (not shown). When the pinch roller cam 37a rotates, the angle of the end of the pinch roller spring 30a changes, thereby changing the pressure with which the pinch roller spring presses the pinch roller against the transport roller. FIG. 7 is an explanatory view showing the operation of the pinch roller cam 37a, and FIG. 7 (a) shows that the end of the pinch roller spring is in contact with the surface having a small radius of the pinch roller cam. The pressure applied to the transport roller is small. In FIG. 7B, the end of the pinch roller spring is in contact with the surface of the pinch roller cam having a large radius, thereby increasing the pressure for pressing the pinch roller against the transport roller.

  Further, a paper guide flapper 33 and a platen 34 for guiding the sheet material P are disposed at an entrance where the sheet material P is conveyed. Further, the pinch roller holder 30 is provided with a PE sensor lever 29 for transmitting the leading edge and trailing edge detection of the sheet P to the PE sensor E0007. The platen 34 is attached to the chassis 11 and positioned. The paper guide flapper 33 is fitted with the transport roller 36 and can be rotated around a sliding bearing portion 33 a and is positioned by contacting the chassis 11.

  A recording head 60 that forms an image based on image information is provided on the downstream side of the conveying roller 36 in the sheet material conveying direction.

  In the above configuration, the sheet material P sent to the paper transport unit 3 is guided by the pinch roller holder 30 and the paper guide flapper 33, and is sent to the roller pair of the transport roller 36 and the pinch roller 37. At this time, the leading edge of the sheet material P conveyed by the PE sensor lever 29 is detected, and thereby the print position of the sheet material P is obtained. Further, the sheet material P is conveyed on the platen 34 as the roller pairs 36 and 37 are rotated by the LF motor E0002. On the platen 34, a rib serving as a conveyance reference surface is formed. The gap with the recording head 60 is managed, and the corrugation of the sheet material P is controlled together with a later-described paper discharge unit. Thus, the undulation is configured not to increase.

  The drive to the transport roller 36 is transmitted to the pulley 36a provided on the shaft of the transport roller 36 by a timing belt 35a (not shown) by the rotational force of the LF motor E0002 made of a DC motor. Further, a code wheel 36b on which markings are formed at a pitch of 150 to 300 lpi for detecting a conveyance amount by the conveyance roller 36 is provided on the axis of the conveyance roller 36, and an encoder sensor 39 for reading the code wheel 36b It is attached to the chassis 11 at an adjacent position 36b.

  The recording head 60 is an ink jet recording head equipped with a replaceable ink tank for each color ink tank. The recording head 60 can apply heat to the ink by a heater or the like. Then, the film of the ink is boiled by this heat, and the ink is ejected from the nozzle 66 of the recording head 60 by a pressure change caused by the growth or contraction of the bubbles due to the film boiling, and an image is formed on the sheet material P.

Further, the paper discharge unit discharges the drive of the two paper discharge rollers 31 and 32, the spur 31a configured to come into contact with the paper discharge rollers 31 and 32 at a predetermined pressure, and can be rotated by being driven. It is composed of a gear train for transmitting to the rollers 31 and 32, and the like. (Fig. 5)
The paper discharge rollers 31 and 32 are attached to the platen 34. The upstream discharge roller 31 is provided with a plurality of rubber portions on a metal shaft. The drive from the transport roller is driven by being transmitted to the paper discharge roller 31 via the idler gear. The paper discharge roller 32 has a structure in which a plurality of elastomer elastic bodies are attached to a resin shaft. Drive to the paper discharge roller 32 is transmitted from the paper discharge roller 31 via an idler gear.

  The spur 31a is a SUS thin plate having a plurality of convex shapes around it, is integrally molded with the resin portion, and is rotatably attached to the spur holder 38. Spur holder springs 38 a for pressing the spur 31 a against the paper discharge rollers 31 and 32 are attached to both sides of the spur holder 38. A spur is provided at a position corresponding to the rubber part and elastic body part of the paper discharge rollers 31 and 32, and mainly serves to generate the conveying force of the sheet material P, and the rubber of the paper discharge rollers 31 and 32 therebetween. There is a role of suppressing the lifting when the sheet material P is mainly printed.

  One end of the spur holder spring 38 a is hooked on the spur holder 38, and the other end is hooked on the spur spring lever 39. The spur spring lever can be rotated in the Z direction in the figure (FIG. 8) by a driving means (not shown), whereby the pulling length of the spur spring 38a can be changed, and the spur 31a can be removed. The pressing force pressed against the paper rollers 31 and 32 can be made variable. FIG. 8 is an explanatory view showing the operation of the spur spring lever. FIG. 8A shows that the spur spring lever is located on the upper side, and the pressing force for pressing the spur by the spur spring against the paper discharge roller is small. In FIG. 8B, the spur spring lever is located on the lower side, and the pressing force for pressing the spur by the spur spring against the paper discharge roller is large.

With the above-described configuration, the sheet material P on which an image is formed by the carriage unit 4 is sandwiched by the nip between the paper discharge roller 31 and the spur 31a, conveyed, and discharged to the paper discharge tray 79. The paper discharge tray 79 is divided into a plurality of parts and can be stored in a lower part of a lower case 78 described later. When used, pull out. The discharge tray 79 increases in height toward the leading end, and the both ends thereof are configured to be high in height, thereby improving the stackability of the discharged sheet material P and preventing the printing surface from being rubbed. (Figure 2)
(C) Carriage unit The carriage unit 4 includes a carriage 40 to which the recording head 60 is attached. The carriage 40 holds a guide shaft 42 for reciprocating scanning in a direction perpendicular to the conveying direction of the sheet material P and a guide rail for maintaining a gap between the recording head 60 and the sheet material P by holding the rear end of the carriage 40. 11a. The guide shaft 42 is attached to the chassis 11. The guide rail 11 a is formed integrally with the chassis 11. On the sliding side of the guide rail 11a with the carriage 40, a thin sliding sheet 43 made of SUS or the like is stretched to reduce sliding noise.

  The carriage 40 is driven by a carriage motor E0001 attached to the chassis 11 via a timing belt 44a. The timing belt 44a is stretched and supported by an idle pulley 44b. The timing belt 44a is coupled to the carriage 40 via a damper 45 made of rubber or the like, and reduces image unevenness by attenuating vibration of the carriage motor E0001 or the like. A code strip E0005 in which markings are formed at a pitch of 150 to 300 lpi for detecting the position of the carriage 40 is provided in parallel with the timing belt 44a. Further, an encoder sensor E0004 (not shown) for reading it is provided on a carriage substrate E0013 (not shown) mounted on the carriage 40. The carriage substrate E0013 is also provided with a contact E0101 (not shown) for electrical connection with the recording head 60. Further, the carriage 40 includes a flexible substrate E0012 (not shown) for transmitting a head signal from the electric substrate E0014 to the recording head 60.

  In order to fix the recording head 60 to the carriage 40, the carriage 40 is provided with an abutting portion 40a (not shown) for positioning and a pressing means 40b (not shown) for pressing and fixing. The pressing means 40b is mounted on the head set lever 41, and is configured to act on the recording head 7 when the head set lever 41 is turned around the rotation fulcrum and set.

  Further, the carriage 40 is provided with a position detection sensor 49 made up of a reflection type optical sensor for recording on a special medium such as a CD-R or for detecting the position of a print result or a paper edge. . The position can be detected by emitting light from the light emitting element and receiving the reflected light.

  In the above configuration, when an image is formed on the sheet material P, the roller pairs 36 and 37 convey the sheet material P to the row position (position in the conveyance direction of the sheet material P) where the image is formed, and the carriage 40 is moved by the carriage motor E0001. The recording head 60 is moved to the row position for image formation (position perpendicular to the conveyance direction of the sheet material P), and the recording head 60 is opposed to the image formation position. Thereafter, the recording head 60 ejects ink toward the sheet material P by a signal from the electric substrate E0014 to form an image.

(D) Cleaning unit The cleaning unit 5 includes a pump 50 for cleaning the recording head 40, a cap 51 for suppressing the drying of the recording head 60, a blade 52 for cleaning the face surface around the nozzles of the recording head 60, and the like. It is composed of

  A one-way clutch M59a (not shown) is provided so as to have a dedicated cleaning motor E0003, so that the pump operates by rotation in one direction, and the blade 52 operation and the cap 51 elevating operation operate in another rotation. Yes.

  The pump 50 is configured to generate a negative pressure by squeezing two tubes 57 (not shown) with a pump roller 58 (not shown). From the cap 51 to the pump 50, a valve 55 (not shown) is provided on the way. It is connected. When the pump 50 is operated with the cap 51 in close contact with the recording head 60, unnecessary ink or the like is sucked from the recording head 60. A cap absorber 51a is provided in the cap 51 portion in order to reduce ink remaining on the face surface of the head 60 after suction. For this reason, the ink remaining in the cap 51 is sucked in a state in which the cap 51 is opened so that the ink remains and does not cause any harmful effects. The waste ink sucked by the pump 50 is absorbed and held in a waste ink absorber 79 provided in a lower case 78 described later.

  A series of operations such as blade 52 operation, cap 51 up-and-down operation, and opening and closing of the valve 55 are controlled by a main cam 53 (not shown) provided with a plurality of cams on the shaft. The cam and arm of each part are acted on the main cam to perform a predetermined operation. The position of the main cam 53 can be detected by a position detection sensor 54 such as a photo interrupter. When the cap 51 is lowered, the blade 52 moves perpendicularly to the scanning direction of the carriage 40 to clean the face surface of the recording head 60. A plurality of blades 52 are provided for cleaning the vicinity of the nozzles of the recording head 60 and for cleaning the entire face surface. Then, when it moves to the innermost position, the ink attached to the blade 52 itself can be removed by contacting the blade cleaner 56.

(E) Exterior Unit Each unit described above is incorporated in the chassis 11 and forms a mechanism part of the printer. The exterior is attached so that the circumference may be covered. The exterior mainly includes a lower case 78, an upper case 74, an access cover 73, a connector cover 72, and a front cover 71.

  A sheet discharge tray rail 78a (not shown) is provided below the lower case 78, and the divided sheet discharge tray 79 can be stored. Further, the front cover 71 is configured to block the paper discharge port when not in use.

  An access cover 73 is attached to the upper case 74 and is configured to be rotatable. A part of the upper surface of the upper case has an opening, and the ink tank 61 and the recording head 60 can be exchanged at this position. Further, the upper case 74 is provided with a door switch lever 75 (not shown) for detecting the opening / closing of the access cover, an LED guide 76 for transmitting / displaying LED light, a key switch 77 acting on the SW of the board, and the like. Yes. Further, the multi-stage sheet feeding tray 26 is rotatably attached to the upper case 74. When the paper feed unit is not used, the paper feed tray 26 is configured to be a cover of the paper feed unit if it is stored.

  Further, the upper case 74 and the lower case 78 are attached with elastic fitting claws. A connector cover 72 (not shown) covers a portion in which the connector portion is provided.

  Next, the operation of the recording apparatus to which the present invention is applied will be briefly described with reference to FIG.

  In FIG. 9A, the sheet material P fed from the above-described sheet feeding unit 2 is nipped and conveyed by the conveyance roller 36 and the pinch roller 37. At this time, the sheet material P is sandwiched only between the transport roller 36 and the pinch roller 37 and does not reach the paper discharge rollers 31 and 32. In this state, the pinch roller cam 37a is held at a position where the pressure at which the pinch roller spring 30a presses the pinch roller 37 against the transport roller 36 is highest. In this case, the spur holder spring 38a is set so that the spur 31a is lightly pressed against the paper discharge rollers 31 and 32. However, since the sheet material P does not reach the discharge rollers 31 and 32 at this time, the pressure of the spur holder spring is not related to the conveyance of the sheet material P, but the drive source for driving the conveyance roller and the discharge roller is not related. Since the force can be reduced, the pressing force is reduced.

  From this state, an image is formed on the sheet material P by the recording head 60, and the sheet material P is conveyed in the Y direction. Next, as shown in FIG. 9B, the leading end of the sheet material P reaches the nip portion of the paper discharge rollers 31 and 32 and the spur 31a, and is moved by both the transport roller 36 and the paper discharge rollers 31 and 32. It will be in the state to be conveyed. In this state, the pressing force of both the pinch roller 37 and the spur 31a is applied to the sheet material P. Therefore, the pinch roller cam 37a is rotationally driven to lower the pressing force of the pinch roller 37 on the sheet material, and the spur spring lever 39 is rotationally driven to increase the pressing force of the spur 31a to the sheet material. Control. At this time, the sum of the pressing force to the sheet material of the pinch roller 37 and the pressing force to the sheet material of the spur 31a presses the sheet material only in the pinch roller 37 shown in FIG. 9A. The pressure is controlled to be substantially equal to the pressing force at the time. The sheet material pressing force of the pinch roller 37 and the spur 31a is controlled so as to gradually change.

  Next, as shown in FIG. 10, when the rear end portion of the sheet material P passes through the conveyance roller 36, the sheet material P is conveyed only by the discharge rollers 31 and 32. In this case, the spur spring lever 39 is rotationally driven to further increase the pressing force of the spur 31a to the sheet material. This pressing force is set to be substantially the same as the pressure for pressing the sheet material only by the pinch roller 37 shown in FIG. At this time, since the pressing force of the pinch roller 37 is not involved in the conveyance of the sheet material, the pinch roller cam 37a is rotationally driven to make the pressing force of the pinch roller 37 the smallest or zero.

  By adopting the above-described configuration, the conveyance accuracy is improved because the pinch roller 37 and the spur 31a act on the sheet material so that the sum is always constant with respect to the pressure pressing the sheet material P. it can.

1 is an external perspective view of a recording apparatus according to a first embodiment of the present invention. FIG. 3 is an external perspective view of the recording apparatus according to the first embodiment of the present invention with the trays opened. FIG. 3 is a perspective view of the inside of the recording apparatus according to the first embodiment of the present invention. FIG. 3 is a perspective view of the inside of the recording apparatus according to the first embodiment of the present invention. 1 is a cross-sectional view of the inside of a recording apparatus according to a first embodiment of the present invention. FIG. 2 is a detailed cross-sectional view of the inside of the recording apparatus according to the first embodiment of the present invention. Explanatory drawing of the conveyance roller part in 1st Example of this invention. Explanatory drawing of the paper discharge roller part in 1st Example of this invention. Explanatory drawing of the conveyance roller and paper discharge roller part in 1st Example of this invention. Explanatory drawing of the conveyance roller and paper discharge roller part in 1st Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Chassis 2 Paper feed part 20 Base 21 Pressure plate 22 Return lever 23 Side guide 24 Separation roller 25 Control cam 26 Paper feed tray 28 Paper feed roller 29 PE sensor lever 30 Pinch roller holder 31 Paper discharge roller 32 Paper discharge roller 33 Paper guide flapper 34 Platen 36 Conveying roller 37 Pinch roller 38 Spur holder 39 Spur spring lever 4 Carriage part 40 Carriage 41 Headset lever 42 Guide shaft 43 Sliding sheet 5 Cleaning part 50 Pump 51 Cap 52 Blade 60 Recording head 61 Ink tank 71 Front cover 72 Connector Cover 73 Access cover 74 Upper case 76 LED guide 77 Key switch 78 Upper case

Claims (7)

  In a recording apparatus having a recording means for forming an image on a recording medium, and a first conveying means and a second conveying means for conveying the recording medium, the first conveying means acts on the recording medium. A first acting force variable means for changing the force; a second acting force variable means for changing the acting force on the recording medium by the second transport means; the first acting force variable means; And a control means for controlling the second acting force variable means.   The control means controls so that the sum of the acting force on the recording medium by the first conveying means and the acting force on the recording medium by the second conveying means is always substantially constant. The recording apparatus according to claim 1.   The recording apparatus according to claim 1, wherein the first transport unit presses a pinch roller against a transport roller to sandwich and feed a recording medium.   The recording apparatus according to claim 1, wherein the first acting force varying unit is configured to change a pressing force of the pinch roller to the conveying roller.   The recording apparatus according to claim 1, wherein the second transport unit presses a spur against the paper discharge roller to sandwich and transport the recording medium.   The recording apparatus according to claim 1, wherein the second acting force variable means is configured to change a pressing force of the spur to a paper discharge roller.   7. The recording apparatus according to claim 1, wherein the control means controls the first acting force varying means and the second acting force varying means to gradually operate.

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