201033431 六、發明說明： 【發明所屬之技術領域】 本發明係有關於一種縫紉機的自動切線裝置，尤指一種用 於水平旋梭鎖式線跡縫紉機的自動切線裝置。 【先前技術】 習知的鎖式線跡縫紉機如中國已公開的發明專利「鎖式線 跡縫紉機」，其申請號為200710104458.1，該缝紉機具有一收 線刀片驅動器驅動一位置保證裝置從卡緊位置到釋放位置，在201033431 VI. Description of the Invention: [Technical Field] The present invention relates to an automatic thread cutting device for a sewing machine, and more particularly to an automatic thread cutting device for a horizontal rotary hook type stitch sewing machine. [Prior Art] A conventional lock stitch sewing machine such as the Chinese disclosed invention "Lock-type stitch sewing machine", whose application number is 200710104458.1, the sewing machine has a take-up blade drive to drive a position assurance device from the clamp position To the release position, at
釋放位置收線刀片可以旋轉，使收線刀片從初始位置移至挑線 位置〇而位置保證裝置内設有偏轉機構，偏轉機構具有樞擺 桿，樞擺桿鉸接一閉鎖桿，閉鎖桿與收線刀片驅動器的提升柱 塞滑動連接，閉鎖桿和樞擺桿在位置保證裝置的卡緊位置受偏 壓彈簧偏壓。當收線刀片要旋轉至挑線位置時，致動收線刀片 驅動器使提升柱塞移出推動閉鎖桿和樞擺桿偏轉至釋放位 置。由於收線刀片驅動器要驅動樞擺桿和閉鎖桿組成的偏轉機 構偏轉，且要推動釋放偏壓彈簧的彈力，而需要較大的推力。 所以此切線裝置較為複雜不穩定，且收線刀片驅動器需要較大 的推力’因而體積相對較大，使得整體體積無法縮小，而收線 刀片驅動器出力時會產生撞擊聲音，亦為其缺失。 加以解決。 另外，藉由偏轉機構等的連桿機構來帶動收線刀片樞轉， 由於其作動的電磁鐵需克服偏壓彈簧的阻力，無法確保收線刀 片從初始位置旋轉至極限位置後才返回，如此無法使梭線和 線順利進入收線刀片的挑線槽中，進而於收線刀片返回初始位 置時切斷，目而切線效率不佳。朗，本發明即針對上述严; 【發明内容】 本發明之主要目的’係在提供_種縫喊的自動切線裝 3 201033431 置’其係將媒動器直接裝在活動刀梅抽的擺臂上，利用驅動 器的芯轴直接與一凸輪組接觸，並藉由凸輪組的曲面變化來 推動4轴，同時驅動擺臂、柩軸及活動刀旋轉，可省卻先前 技術的偏轉連桿機構與偏壓彈簧，使整體裝置更為簡單，結 構緊湊，可增強切線穩定性。 ’ 本發明之另一目的，係在提供一種縫紉機的自動切線裝 置，其凸輪組的復位凸輪在切線週期結束時可將驅動器的芯 軸推回原位，可省卻習知技術將驅動器復歸的偏壓彈簧，因 此驅動器芯軸伸出時不會遇到任何阻力，而可使用推力較 φ 小，體積也較小的驅動器來傳動，使整體體積縮小，並可避 免軀動器產生明顯的撞擊聲音。 本發明之再一目的，係在提供一種縫紉機的自動切線裝 置，藉由凸輪組的限位凸輪在切線週期的初期限制驅動器芯 袖前端的位置來帶動活動刀由初始位置旋轉至勾線位置，可 確保活動刀轉動到極限位置才返回，以確保勾線動作，提升 切線效率。 為達上述目的，本發明縫紉機的自動切線裝置所採用的 技術手段係包含： Ο 一旋梭座，其上固定一固定刀。 一傳動軸，安裝於該旋梭座中。 一凸輪組’裝設於該傳動轴上，並與該傳動轴同步轉動， 該凸輪組包括一轴向凸輪、一限位凸輪與一復位凸輪，該軸 向凸輪與該限位凸輪相鄰的面分別形成偏轉曲面，且二偏轉 曲面之間形成一導引槽，該轴向凸輪並具有一鄰接於該偏轉 曲面的回轉曲面’該復位凸輪於徑向方向形成一復位曲面。 一活動刀，經由一樞軸樞設於該旋梭座上，該樞軸下方 具有一擺臂，該擺臂上安裝有一驅動器，該驅動器具有一可 向凸輪組徑向活動伸縮的芯軸。 4 201033431 當活動刀需要轉動至能捕捉缝線的勾線位置時，驅動器 得到信號，以電磁駆動方式使芯軸向該凸輪组方向伸出，隨 著該傳動軸轉動，芯軸前端沿著該導引槽前進，該導引槽使 芯軸於傳動軸的轴向移動偏擺，並帶動擺臂及樞軸轉動，而 驅動活動刀由與固定刀相接的初始位置旋轉至勾線位置。接 著，藉由該軸向凸輪的回轉曲面將該芯轴前端推回初始位 置，並帶動擺臂及樞轴反向轉動使活動刀反向旋轉歸位，與 該固定刀相接完成切線動作。同時，該芯軸端面受復位凸輪 的復位曲面推回縮回位置，而完成切線週期。 ❹ 本發明之其他特點及具體實施例可於以下配合附圖之詳 細說明中，進一步瞭解。 【實施方式】 請參閱第1圖’係本發明位於縫紉機上的位置示意圖； 第2圖，係由第1圖ai方向看去的俯視圖；第3圖，係本發 明的立體圖。本發明縫紉機的自動切線裝置係包含一旋梭座 1 ’旋梭座1是設置在基板6上，旋梭座丨上裝設一傳動轴2， 傳動轴2經由-帶傳動裳置（圖未顯示）連接到位於缝初機 臂部7内的上軸70〇傳動軸2並經由位於旋梭座i中的一組 #輪傳動裝置（圖未顯示）驅動安裝於旋梭座i上的旋梭^ 旋轉。旋梭11的一側設有一固定刀12，且固定刀12固定於 旋梭座1上。 該切線裝置包含有一活動刀3,活動刀3可旋轉地設置於 旋梭11的另一侧，活動刀3是固定於-梅設在旋梭座1中的 樞軸31上，活動刀3可隨著樞軸31的轉動而由與固定刀12 相接的初始位置（如第2圖）旋轉至勾線位置，並反向旋轉 歸位，與固定;7 12相接完成切線動作。 請配合參閱第4-6圖，該傳動轴2上設置有同步轉動的一 5 201033431 凸輪組4，凸輪組4包含一轴向凸輪41、一限位凸輪42與一 復位凸輪43。該轴向凸輪41與限位凸輪42相鄰的面分別具 有一偏轉曲面410、420，且二偏轉曲面410、420之間形成一 曲線狀的導引槽44。該限位凸輪42呈扇形。該軸向凸輪41 並具有一鄰接於偏轉曲面410的回轉曲面411。復位凸輪43 位於回轉曲面411的侧邊，並於徑向形成一復位曲面43〇，以 及與復位曲面430相連接的讓位曲面431，讓位曲面431並相 鄰於該導引槽44，如第7、8圖。 上述安裝活動刀3的樞轴31下方具有一擺臂32，擺臂 ❹ 32上安裝有一驅動器5。驅動器5具有一可於凸輪組4徑向 活動伸縮的芯軸50，驅動器5為一電磁鐵，而芯轴50前端裝 設一滾輪51 ’當電磁鐵通電致動後，芯轴50即向凸輪組4 方向伸出。 清參閱第7-9圖’第7圖為切線裝置在初始狀態，也是平時 的縫製狀態’凸輪組4隨著傳動軸2連續旋轉，滾輪51與凸輪 組4不接觸，活動刀3位於與固定刀相接的初始位置。當縫製 結束需要切線時，活動刀3需要轉動至能捕捉缝線的勾線位 置，此時驅動器5得到縫紉機控制器配合傳動轴2旋轉到適當 ❹ 角度位置時發出的信號，將芯軸50向凸輪組4方向伸出，如第 8囷所示，隨著傳動軸2沿箭頭方向轉動，芯軸50前端的滾輪 51沿著復位凸輪43的讓位曲面431前進到導引槽44，導引槽44 隨著傳動轴2轉動而對滾輪51形成一沿傳動軸的轴向推力，推 動擺臂32與樞轴31繞轴線Y轉動，同時帶動活動刀3繞轴線Y 旋轉，由與固定刀相接的初始位置沿箭頭方向旋轉至勾線位 置，完成準備勾線動作，如第9圖。接著，隨著傳動軸2繼績 轉動，該滾輪51離開限位凸輪42，藉由軸向凸輪41的回轉曲 面411產生一反向的轴向推力，將芯轴50推回初始位置，同時 擺臂32與柩轴31繞軸線Y反向旋轉，並帶動活動刀3反向旋轉 6 201033431 勾線並歸位，與固定刀完成切線動作。同時，該芯轴5〇受復 位凸輪43的復位曲面430推動而漸縮回復位，如第7圖所示。 本發明將躁動器5直接安裝在擺臂32上，藉由驅動器5的 芯軸50直接與凸輪組4接觸，由凸輪組4曲面的變化來推動擺 臂32旋轉，進而驅動活動刀3旋轉，其結構簡單緊湊，可提高 切線穩定性。且驅動器5的芯抽50伸出時不會遇到任何阻力， 可輕鬆地到達指定位置，驅動器5不需要太大的推力，因此， 可採用較小的電磁鐵來實施，而能縮小整體的體積。 請參閲第10-12圖，第1〇圖為本發明由第1圖&3方向看去的 Φ 平面示意圖，第11圖為本發明第ίο圖的fi-fr剖面示意圖，第 12圖為本發明第1 〇圖的f2-f2 ’剖面示意圖。本發明可於旋梭座i 中裴設一穩定活動刀3的裝置，該樞軸31上設有一開口槽 310 ’旋梭座1於樞轴31的徑向方向上設有一開孔，開孔中螺 合一定位螺絲13 ,定位螺絲13内設有一彈簧14，彈簧14前端 設有一鋼珠15，鋼珠15並抵靠於開口槽31〇，藉由定位螺絲13 加壓一定的力到樞轴31的開口槽310，可以穩定活動刀3的初 始位置。 请參閲第13圖’為第1〇圖的β-β’剖面示意圖，本發明亦 β 可於擺臂32中裝設一穩定驅動器芯轴50的裝置。該驅動器5芯 軸50設有一環狀藏形槽5〇1，該擺臂32於驅動器芯軸50的徑向 方向設有一開孔，開孔内裝設一抵靠於弧形槽5〇1的鋼珠320 與一彈簧321 ’彈簧321外側並以一定位螺絲322鎖入開孔内固 定。藉由定位螺絲322加壓一定的力到芯軸50上的弧形槽 501 ’可以穩定驅動器芯轴5〇的初始位置。 以上所述者，僅為本發明之較佳實施例，當不能用以限 定本發明可實施之範圍，凡習於本業之人士所明顯可作變化 與修飾，皆應視為不悖離本發明之實質内容。 7 201033431 【圓式簡單說明】 第1圖係為本發明位於縫紉機上的位置示意圏。 第2圖係為本發明由第1圖al方向看去的俯視圖。 第3圖係為本發明之立逋圖。 第4囷係為本發明由第1圖a2方向看去的平面示意圖。 第5圖係為本發明凸輪組的平面示意圖（一）。 第6囷係為本發明凸輪組的平面示意圖（二）。 第7圖係為本發明位於初始狀態的切線動作示意圖（一）。 第8圖係為本發明的切線動作示意圖（二）。 ❹ 第9圖係為本發明的切線動作示意圓（三）。 第W圖係為本發明由第1圖a3方向看去的示意囷。 第11圖係為本發明第10圖的剖面示意圖。 第12圖係為本發明第1〇圖的β_β，剖面示意圖。 第13圏係為本發明第1〇囷的β_β，剖面示意圓。 【主要元件符號說明】 1、旋梭座 2、傳動轴 3、活動刀 4、凸輪組 5、驅動器 6、基板 7、臂部 1卜旋梭 12、固定刀 13、定位螺絲 14、彈簧 15、鋼珠 31、栖轴 32、擺臂 41、軸向凸輪 42、限位凸輪 43、復位凸輪 44、導引槽 50、芯轴 5卜滾輪 70、上軸 310、開口槽 320、鋼珠 321、彈簧 8 201033431 322、定位螺絲 410 411、回轉曲面 420 430、復位曲面 431 5(Π、弧形槽 偏轉曲面 偏轉曲面 讓位曲面The release position of the take-up blade can be rotated to move the take-up blade from the initial position to the take-up position, and the position assurance device is provided with a deflection mechanism, the deflection mechanism has a pivot lever, the pivot lever is hinged to a lock lever, and the lock lever is closed. The lifting blade slide connection of the wire blade drive, the locking lever and the pivot lever are biased by the biasing spring at the clamping position of the position assurance device. When the take-up blade is to be rotated to the take-up position, actuating the take-up blade drive moves the lift plunger out of the push-lock lever and the pivot lever to the release position. Since the take-up blade driver is to deflect the deflection mechanism consisting of the pivot lever and the lock lever, and to push the elastic force of the biasing spring, a large thrust is required. Therefore, the tangential device is relatively complicated and unstable, and the take-up blade driver requires a large thrust ‘and thus the volume is relatively large, so that the overall volume cannot be reduced, and the impact sound is generated when the take-up blade driver outputs the power, which is also missing. Solve it. In addition, the take-up blade pivots by the linkage mechanism of the deflection mechanism or the like, and the electromagnet that is actuated must overcome the resistance of the biasing spring, and cannot ensure that the take-up blade returns from the initial position to the extreme position, so that It is impossible to smoothly pass the shuttle wire and the wire into the take-up groove of the take-up blade, and then cut off when the take-up blade returns to the initial position, and the tangential efficiency is not good.朗, the present invention is directed to the above-mentioned strictness; [Summary of the Invention] The main object of the present invention is to provide an automatic tangential device 3 201033431, which is provided with a mechanism for directly mounting the actuator on the movable arm of the movable knife. In the above, the mandrel of the driver is directly in contact with a cam group, and the four axes are pushed by the curved surface change of the cam group, and the swing arm, the x-axis and the movable knife are driven to rotate, thereby eliminating the prior art deflection link mechanism and the partial deflection. The compression spring makes the overall device simpler and compact, which enhances the stability of the tangent. Another object of the present invention is to provide an automatic thread cutting device for a sewing machine, in which the reset cam of the cam group can push the mandrel of the driver back to the original position at the end of the tangential cycle, thereby eliminating the bias of the conventional technique to reset the drive. The spring is pressed, so that the drive mandrel does not encounter any resistance when it protrudes, and the drive with smaller thrust and smaller volume can be used to reduce the overall volume and avoid the obvious impact sound of the body. . A further object of the present invention is to provide an automatic thread cutting device for a sewing machine, wherein the limit cam of the cam set restricts the position of the front end of the driver core sleeve at the beginning of the tangential cycle to drive the movable knife from the initial position to the hook line position. It can ensure that the movable knife rotates to the extreme position before returning to ensure the hook line action and improve the tangent efficiency. In order to achieve the above object, the technical means for the automatic thread trimming device of the sewing machine of the present invention comprises: Ο A rotary hook seat on which a fixed knife is fixed. A drive shaft is mounted in the hook base. a cam set is mounted on the drive shaft and rotates synchronously with the drive shaft. The cam set includes an axial cam, a limit cam and a reset cam, the axial cam being adjacent to the limit cam The surfaces respectively form a deflecting curved surface, and a guiding groove is formed between the two deflecting curved surfaces, and the axial cam has a rotating curved surface adjacent to the deflecting curved surface. The reset cam forms a reset curved surface in a radial direction. A movable knife is pivotally mounted on the hook base via a pivot having a swing arm below the pivot, and a drive is mounted on the swing arm, the drive having a mandrel that is radially movable and retractable toward the cam set. 4 201033431 When the movable knife needs to be rotated to the position of the hook line capable of catching the suture, the driver obtains a signal to electromagnetically move the core axially in the direction of the cam group, and as the drive shaft rotates, the front end of the mandrel follows The guiding groove advances, the guiding groove shifts the mandrel in the axial direction of the transmission shaft, and drives the swing arm and the pivoting, and the driving movable knife is rotated to the hook line position by the initial position connected to the fixed knife. Then, the front end of the mandrel is pushed back to the initial position by the curved surface of the axial cam, and the swing arm and the pivot are reversely rotated to reversely rotate the movable knife to return to the position, and the fixed knife is connected to complete the tangential action. At the same time, the end face of the mandrel is pushed back to the retracted position by the reset surface of the reset cam, and the tangential cycle is completed. Further features and specific embodiments of the present invention will be further understood from the following detailed description of the drawings. [Embodiment] Referring to Fig. 1 is a schematic view showing a position of the present invention on a sewing machine; Fig. 2 is a plan view seen from the direction of Fig. 1a; and Fig. 3 is a perspective view of the present invention. The automatic thread cutting device of the sewing machine of the present invention comprises a rotary bobbin 1 'the rotary bobbin 1 is disposed on the base plate 6, and the drive shaft 2 is mounted on the rotary bobbin, and the drive shaft 2 is disposed via the belt drive (Fig. The display is connected to the upper shaft 70〇 of the transmission shaft 2 located in the initial arm portion 7 and drives the rotation mounted on the hook base i via a set of #wheel transmissions (not shown) located in the hook base i Shuttle ^ Rotate. A fixed blade 12 is provided on one side of the hook 11, and the fixed blade 12 is fixed to the hook base 1. The tangential device comprises a movable knife 3, the movable knife 3 is rotatably disposed on the other side of the rotary hook 11, and the movable knife 3 is fixed on a pivot 31 provided in the hook support 1, and the movable knife 3 can be As the pivot 31 rotates, the initial position (as shown in FIG. 2) that is in contact with the fixed blade 12 is rotated to the hook line position, and the home position is reversely rotated, and the tangential action is completed by the connection; Referring to Figures 4-6, the drive shaft 2 is provided with a synchronously rotating 5 201033431 cam set 4, which includes an axial cam 41, a limit cam 42 and a reset cam 43. The faces of the axial cam 41 adjacent to the limit cams 42 respectively have a deflecting curved surface 410, 420, and a curved guiding groove 44 is formed between the two deflecting curved surfaces 410, 420. The limit cam 42 has a fan shape. The axial cam 41 has a curved surface 411 adjacent to the deflecting curved surface 410. The reset cam 43 is located at a side of the curved surface 411, and forms a reset curved surface 43A in the radial direction, and a yield curved surface 431 connected to the reset curved surface 430, and the letting curved surface 431 is adjacent to the guiding groove 44, such as Figures 7, 8 A pivot arm 32 is disposed below the pivot 31 of the movable knife 3, and a driver 5 is mounted on the swing arm 32. The driver 5 has a mandrel 50 that is radially movable and retractable in the cam group 4. The driver 5 is an electromagnet, and a front end of the mandrel 50 is provided with a roller 51. When the electromagnet is energized and actuated, the mandrel 50 is cammed. Group 4 extends out. Refer to Figure 7-9'. Figure 7 shows the tangential device in the initial state, which is also the usual sewing state. The cam group 4 rotates continuously with the drive shaft 2, the roller 51 does not contact the cam group 4, and the movable knife 3 is fixed and fixed. The initial position where the knife is connected. When the sewing end requires tangential cutting, the movable knife 3 needs to be rotated to the position of the hook line capable of catching the suture, and at this time, the driver 5 obtains a signal issued by the sewing machine controller in conjunction with the rotation of the transmission shaft 2 to the appropriate 角度 angular position, and the mandrel 50 is directed. The cam group 4 is extended in the direction of the cam group 4, as shown in FIG. 8 , as the propeller shaft 2 rotates in the direction of the arrow, the roller 51 at the front end of the mandrel 50 advances along the letting curved surface 431 of the reset cam 43 to the guiding groove 44, guiding The groove 44 forms an axial thrust along the transmission shaft with the drive shaft 2, and pushes the swing arm 32 and the pivot shaft 31 to rotate about the axis Y, and simultaneously drives the movable knife 3 to rotate about the axis Y. The initial position of the knife is rotated in the direction of the arrow to the hook line position, and the preparatory hook line action is completed, as shown in Fig. 9. Then, as the transmission shaft 2 continues to rotate, the roller 51 leaves the limiting cam 42 and generates a reverse axial thrust by the curved surface 411 of the axial cam 41, pushing the mandrel 50 back to the initial position while pendulum The arm 32 and the boring shaft 31 rotate in the opposite direction around the axis Y, and drive the movable knife 3 to rotate in the opposite direction. 6 201033431 The hook line is homing and the tangential action is completed with the fixed knife. At the same time, the mandrel 5 is pushed by the reset curved surface 430 of the reset cam 43 to be tapered back, as shown in Fig. 7. According to the present invention, the slinger 5 is directly mounted on the swing arm 32, and the mandrel 50 of the driver 5 is directly in contact with the cam set 4, and the swinging arm 32 is rotated by the change of the curved surface of the cam set 4, thereby driving the movable knives 3 to rotate. The structure is simple and compact, and the tangential stability can be improved. Moreover, the core pump 50 of the driver 5 does not encounter any resistance when it is extended, and can easily reach the designated position, and the driver 5 does not need too much thrust. Therefore, a smaller electromagnet can be used to implement the reduction, and the overall can be reduced. volume. Please refer to FIG. 10-12. FIG. 1 is a schematic view of the Φ plane seen from the direction of FIG. 1 and FIG. 3, and FIG. 11 is a cross-sectional view of the fi-fr of the first drawing of the present invention, FIG. It is a schematic cross-sectional view of f2-f2' in the first drawing of the present invention. In the present invention, a device for stabilizing the movable blade 3 can be disposed in the hook base i. The pivot shaft 31 is provided with an open slot 310. The rotary hook seat 1 is provided with an opening in the radial direction of the pivot shaft 31. The center screw has a set screw 13 , and a spring 14 is disposed in the set screw 13 . The front end of the spring 14 is provided with a steel ball 15 , and the steel ball 15 abuts against the open slot 31 , and a certain force is applied to the pivot 31 by the positioning screw 13 . The open slot 310 can stabilize the initial position of the movable blade 3. Referring to Fig. 13', which is a schematic view of the β-β' section of Fig. 1, the present invention can also be provided with a means for stabilizing the driver mandrel 50 in the swing arm 32. The driver 5 mandrel 50 is provided with an annular recessed groove 5〇1. The swing arm 32 is provided with an opening in the radial direction of the driver spindle 50, and the opening is provided with an arcuate groove 5〇1. The steel ball 320 is fixed to the outside of the spring 321 'spring 321 and locked by a positioning screw 322 into the opening. The initial position of the actuator mandrel 5〇 can be stabilized by the positioning of the screw 322 to press a certain force onto the curved groove 501' on the mandrel 50. The above descriptions are merely preferred embodiments of the present invention, and should not be construed as limiting the scope of the invention, and variations and modifications may be made by those skilled in the art. The substance of the matter. 7 201033431 [Circular Simple Description] Fig. 1 is a schematic illustration of the position of the present invention on the sewing machine. Fig. 2 is a plan view of the present invention as seen from the direction of the first view of Fig. 1. Figure 3 is a perspective view of the present invention. The fourth aspect is a schematic plan view of the invention as seen from the direction of Fig. 1a. Figure 5 is a plan view (1) of the cam set of the present invention. The sixth line is a schematic plan view of the cam set of the present invention (2). Fig. 7 is a schematic view (1) of the tangential action of the present invention in an initial state. Figure 8 is a schematic view of the tangential action of the present invention (2). ❹ Figure 9 is a schematic diagram of the tangential action of the present invention (3). The Fig. W is a schematic view of the invention as seen from the direction of Fig. 1a. Figure 11 is a schematic cross-sectional view showing a tenth line of the present invention. Fig. 12 is a schematic cross-sectional view showing β_β in Fig. 1 of the present invention. The 13th 圏 is the β_β of the first 发明 of the present invention, and the cross section is schematically round. [Description of main component symbols] 1. Rotary seat 2, drive shaft 3, movable knife 4, cam set 5, driver 6, base plate 7, arm 1 shuttle 12, fixed knife 13, set screw 14, spring 15, Steel ball 31, habitat shaft 32, swing arm 41, axial cam 42, limit cam 43, reset cam 44, guide groove 50, mandrel 5 roller 70, upper shaft 310, open groove 320, steel ball 321 , spring 8 201033431 322, positioning screw 410 411, turning surface 420 430, reset surface 431 5 (Π, curved groove deflecting surface deflection surface letting surface