WO2022198690A1

WO2022198690A1 - Sewing machine

Info

Publication number: WO2022198690A1
Application number: PCT/CN2021/083788
Authority: WO
Inventors: 朱义潜; 朱永中; 钱敏
Original assignee: 浙江沪龙科技股份有限公司
Priority date: 2021-03-24
Filing date: 2021-03-30
Publication date: 2022-09-29
Also published as: CN113026222A; CN113026222B

Abstract

A sewing machine, comprising a housing (1), a reverse and forward sewing mechanism, a thread trimming mechanism, a spindle (2), and a spindle electric motor (3). The spindle is in transmission connection with a lower shaft (4) by means of a lower-shaft transmission assembly, the thread trimming mechanism comprises a thread cutting crank (5) and a thread cutting cam (7), which is sleeved on the lower shaft, the thread cutting crank can be axially translated so as to be linked with or separated from the thread cutting cam, the housing is provided with a drive electric motor (8), and a linkage assembly is arranged between an output shaft (9) of the drive electric motor and the thread cutting crank; and by means of the linkage assembly, the drive electric motor drives the thread cutting crank to axially translate, and the output shaft of the drive electric motor is connected to a swing seat (11) of the reverse and forward sewing mechanism by means of a reverse and forward sewing transmission assembly (10), and then drives the swing seat to swing, so as to realize the switching between reverse and forward sewing of the reverse and forward sewing mechanism. By means of the sewing machine, a single electric motor is used to drive the reverse and forward sewing mechanism and a thread-trimming driving assembly, such that the cost of a product is effectively reduced, a mounting space in the sewing machine is optimized, and the overall structure of the sewing machine is reduced.

Description

a sewing machine

Technical field:

The invention belongs to the technical field of sewing equipment, in particular to a sewing machine.

Background technique:

At present, the reverse sewing mechanism on the sewing machine generally requires a drive source or manual adjustment of the position angle of the swing seat to adjust the swing amplitude of the upper shaft driven by the connecting rod assembly to drive the feed shaft, thereby adjusting the reverse sewing and stitch length. the goal of. The automatic thread trimming mechanism on the sewing machine is also driven by the driving source to drive the rotation of the moving knife holder, and then realizes the thread trimming action with the cooperation of the fixed knife.

For example, a sewing machine disclosed in a Chinese invention patent application (application publication number: CN 111648053 A, application date: 2020.07.02) includes a main shaft, a tooth frame, a feeding tooth mounted on the tooth frame, a main shaft and a tooth The feeding mechanism between the frames, the feeding mechanism has a feeding swing seat that can rotate around the first fixed swing fulcrum, the angle of the feeding swing seat determines the stitch length of the sewing machine, and also includes a drive motor and an output shaft connected to the drive motor. A power transmission mechanism for adjusting the needle distance with the feeding swing seat, the power transmission mechanism for adjusting the needle distance enables continuous power transmission between the driving motor and the feeding swing seat.

At the same time, a Chinese invention patent (authorization announcement number: CN106894175B; publication date: 2020.01.31) discloses an automatic thread trimming mechanism for a sewing machine and a sewing machine, which include a lower shaft rotatably supported in the bottom plate of the sewing machine and fixed on the lower shaft A wire-cutting drive cam and a movable knife assembly that can swing around the lower shaft, the movable knife assembly includes at least one movable knife, a movable knife holder for installing the movable knife, and a movable knife holder parallel to the lower shaft. A crankshaft, a wire-cutting drive assembly mounted on one end of the crankshaft, a wire-cutting crank fixed on the other end of the crankshaft, and a wire-cutting link, the wire-cutting drive assembly has a first extension arm, the end of the first extension arm A roller is connected to the part of the wire-cutting connecting rod, and the two ends of the wire-cutting connecting rod are hinged with the wire-cutting crank and the movable tool rest respectively. The sub and the trimmer contact surface are matched.

It can be seen that the reverse sewing mechanism and the automatic thread trimmer drive assembly both need to be driven by their respective drive sources, which occupy a large space, make the overall structure of the sewing machine bloated, and at the same time lead to higher product costs.

Invention content:

The purpose of the present invention is to provide a sewing machine with a reverse sewing mechanism and a thread trimmer drive assembly driven by a single motor.

The present invention is realized in this way:

A sewing machine includes a casing, a reverse sewing mechanism, a thread trimming mechanism, a main shaft and a main shaft motor. The main shaft is connected to the lower shaft through a lower shaft transmission assembly. The thread trimming mechanism includes a thread trimming crank and a thread trimming cam sleeved on the lower shaft. The tangent crank can be axially translated to be linked or separated from the tangent cam. A drive motor is arranged on the casing, and a linkage assembly is arranged between the output shaft of the drive motor and the tangent crank. The drive motor drives the tangent crank through the linkage assembly to operate. Axial translation, and the output shaft of the drive motor is connected with the swing seat of the reverse seam mechanism through the reverse seam transmission assembly to drive the swing seat to swing, so as to realize the reverse seam switching of the reverse seam mechanism.

In the above-mentioned sewing machine, the thread trimming mechanism further includes a thread trimming crank shaft, the thread trimming crank is sleeved on the thread trimming crank shaft, and the linkage assembly includes an adapting crank sleeved on the cloth feed shaft, and the adapting crank is sleeved on the cloth feed shaft. The crank can rotate in the circumferential direction relative to the feed shaft, the crank end of the transfer crank is connected with the swing seat through the connecting rod, and the transfer crank and the tangential crank shaft are intermittently linked. The rod drives the transfer crank to rotate, thereby driving the tangent crank shaft and the tangent crank to axially translate in the direction of the tangent cam.

In the above-mentioned sewing machine, the connecting rod is provided with a strip-shaped sliding hole along its axial direction, and the swing seat is slidably connected in the strip-shaped sliding hole through a plug-in pin.

In the above-mentioned sewing machine, the transfer crank is provided with a roller, a return spring is provided between the tangent crank shaft and the casing, the roller is contacted and connected at the edge of the corresponding end face of the tangent crank shaft, and the transfer crank drives the The roller rotates to push the tangent crank shaft to axially translate in the direction of the tangent cam against the elastic force of the return spring.

In the above-mentioned sewing machine, it also includes a thread release mechanism and a thread release wire rope whose connecting end is fixed on the thread release mechanism, a thread release plate member is fixed on the thread tangent crank shaft, and the driving end of the thread release wire rope is fixed on On the loosening plate, the tangential crank shaft is axially translated, and the loosening mechanism is pulled by the loosening steel rope to make the loosening action.

In the above-mentioned sewing machine, locking rings are sleeved on the cloth feed shafts located on both sides of the switching crank.

In the above-mentioned sewing machine, the thread trimming mechanism further includes a thread trimming crank shaft, the thread trimming crank is sleeved on the thread trimming crank shaft, and the linkage assembly includes an adapting crank sleeved on the cloth feed shaft, and the adapting crank is sleeved on the cloth feed shaft. The crank can rotate in the circumferential direction relative to the feed shaft. The crank end of the transfer crank is connected with the swing seat through the connecting rod, and the transfer crank and the tangent crank are intermittently linked. After sewing to the maximum stitch length, the swing seat continues to rotate through the connecting rod. The transfer crank is driven to rotate, thereby driving the tangent crank to translate axially in the direction of the tangent cam.

In the above-mentioned sewing machine, a thread release plate member is rotatably connected to the casing, the thread release plate member is provided with a roller, a return spring is arranged between the thread tangent crank and the casing, and the transfer crank is provided with an arc-shaped dial and the rotation of the arc-shaped toggle rod can push the thread release plate to rotate through the roller, and then the thread release plate pushes the tangent crank to axially translate in the direction of the tangent cam against the elastic force of the return spring.

In the above-mentioned sewing machine, it also includes a thread loosening mechanism and a thread loosening steel rope whose connecting end is fixed on the thread loosening mechanism. , Pull the loosening mechanism through the loosening wire rope to make the loosening action.

In the above-mentioned sewing machine, the thread trimming mechanism further includes a thread trimming crank shaft, the thread trimming crank is sleeved on the thread trimming crank shaft, and the linkage assembly includes a driving thread releasing combination plate rotatably connected to the casing , the output shaft of the drive motor is sleeved with a drive wheel, one end of the driving wire-releasing combination plate is linked with one end of the tangent crankshaft close to the driving wire-releasing combination plate, and the other end is fixed with one end of the driving wire rope, The other end of the driving wire rope is connected to the driving wheel, and after sewing to the maximum stitch length, the output shaft of the driving motor continues to rotate, and the thread loosening combination plate is driven to rotate by the driving wire rope, thereby pushing the tangent crank shaft and the tangent crank toward the tangent. The cam direction is translated axially.

In the above-mentioned sewing machine, a return spring is provided between the thread tangent crank shaft and the casing, and one end of the thread tangent crank shaft close to the drive thread release combination plate is a free end and abuts against the corresponding end of the drive thread release combination plate superior.

In the above-mentioned sewing machine, it also includes a thread release mechanism and a thread release wire rope whose connecting end is fixed on the thread release mechanism. Drive the loosening combination plate to rotate and pull the loosening mechanism through the loosening wire rope to make the loosening action.

In the above-mentioned sewing machine, it also includes a presser foot lifter mechanism and a rear lever rotatably connected to the casing, and the rear lever is connected with the output shaft of the drive motor through the presser foot lifter drive assembly.

In the above-mentioned sewing machine, the front end of the rear lever is provided with a rear lever fork, and the rear end is connected with the presser foot lifter mechanism, and the presser foot lifter drive assembly includes a drive wheel sleeved on the output shaft of the drive motor. , the driving wheel and one end of the lifting and pressing driving rod are rotated to realize the clutch, the other end of the lifting and pressing driving rod is hinged on the rotating end of the driving plate, the connecting end of the driving plate is rotatably connected to the casing, and the rotating end is slidably connected to the rear lever at the fork.

In the above-mentioned sewing machine, the driving motor includes a motor housing and an output shaft rotatably connected in the motor housing, and the front end of the motor housing extends forward to form an extension inserted on the housing. The extension part is provided with a through hole along its axial direction, the front end of the output shaft penetrates the through hole outward into the casing, and an oil seal is arranged between the output shaft and the through hole, and the extension part is located on the rear side of the through hole. A support bearing is arranged between it and the output shaft.

In the above-mentioned sewing machine, an O-ring sleeved on the extension portion is provided between the front end surface of the motor casing and the outer end surface of the casing.

Compared with the prior art, the present invention has the following advantages:

1. The invention uses a single motor to drive the reverse sewing mechanism and the thread trimming drive assembly, which effectively reduces the cost of the product, optimizes the installation space in the sewing machine, and reduces the overall structure of the sewing machine;

2. The present invention uses a single motor to drive the thread-cutting drive component instead of directly driving the thread-cutting moving knife, so that the power of the thread-cutting moving knife comes from the spindle motor, and the action sequence machinery such as the thread-cutting moving knife, the thread take-up lever, and the rotary hook are retained. The classic design of linkage has the advantages of large output, no sticking of the knife, stable and reliable thread end, and not easy to get off the thread when starting the seam;

3. The present invention drives the thread trimming drive assembly by a single motor instead of directly driving the thread trimmer moving knife, which can effectively reduce the rotation angle of the drive motor during the thread trimming action. In this case, the rotation angle can be reduced by two-thirds; The angle space can increase the range of the stitch length of the reverse stitch, which can be expanded from the normal range of plus or minus 5mm to plus or minus 7mm, which increases the use range of the equipment;

4. The drive motor of the present invention can also be used as the power source of the presser foot lifting mechanism and the thread loosening mechanism at the same time, so as to realize the four functions of reverse sewing, presser foot lifting, thread trimming and thread loosening, thereby reducing the production cost more significantly. At the same time, the four functions are aggregated and controlled on a single motor, which significantly reduces the work procedure, improves the work efficiency, and makes the sewing machine operation simpler, more convenient and faster.

Description of drawings:

1 is a perspective view of the overall structure of Embodiment 1 of the present invention;

2 is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

3 is a schematic front view of the linkage assembly according to the first embodiment of the present invention;

4 is a left side schematic view of the linkage assembly according to the first embodiment of the present invention;

Fig. 5 is the schematic diagram of the thread trimming mechanism of the present invention;

6 is a schematic diagram of the cooperation between the drive motor and the casing of the present invention;

7 is a perspective view of the overall structure of the second embodiment of the present invention;

8 is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

9 is a schematic diagram of a linkage assembly according to Embodiment 2 of the present invention;

10 is a perspective view of the overall structure of the third embodiment of the present invention;

FIG. 11 is a schematic diagram of the overall structure of the third embodiment of the present invention.

In the figure: 1, the casing; 2, the main shaft; 3, the main shaft motor; 4, the lower shaft; 5, the tangent crank; 6, the tangent crank shaft; 7, the tangent cam; 8, the drive motor; 9, the output shaft; 10, Eccentric wheel assembly; 11, swing seat; 12, cloth feed shaft; 13, transfer crank; 14, connecting rod; 15, strip sliding hole; 17, roller; 18, return spring; 19, loose wire rope; 20 21, the locking ring; 22, the driving wire release combination plate; 24, the driving wire rope; 25, the rear lever; 26, the rear lever fork; 27, the driving wheel; 28, the lifting and pressing driving rod; 29, drive plate; 30, motor housing; 31, extension; 32, oil seal; 33, support bearing; 34, O-ring; 35, arc toggle rod.

Detailed ways:

The present invention will be further described below with specific embodiments, referring to Figures 1-11:

Example 1:

A sewing machine includes a casing 1, a reverse sewing mechanism, a thread trimming mechanism, a main shaft 2 and a main shaft motor 3. The main shaft 2 is connected to the lower shaft 4 through a lower shaft transmission assembly. In this embodiment, the lower shaft drives The assembly adopts the vertical rotating shaft assembly in the prior art, that is, a vertical rotating shaft is connected vertically in the casing 1, the main shaft 2 and the lower shaft 4 are respectively sleeved with a driving bevel gear and a driven bevel gear, and the upper and lower parts of the vertical shaft are The ends are respectively sleeved with a transmission bevel gear that meshes with the corresponding bevel gear.

At the same time, both the thread trimming mechanism and the reverse sewing mechanism adopt the existing structure, that is, the thread trimming mechanism includes a thread trimming crank 5 and a thread trimming cam 7 sleeved on the lower shaft 4, and the thread trimming crank 5 can be axially translated in linkage with the thread trimming cam 7 or The lower shaft 4 drives the tangent cam 7 to rotate under the drive of the upper shaft. When the tangent crank 5 is combined with the tangent cam 7, the tangent crank 5 drives the tool holder linked with the tangent crank 5 under the drive of the tangent cam 7. Rotate to realize the thread trimming function;

The reverse sewing mechanism includes a cloth feed shaft 12, a cloth feed link assembly connecting the upper shaft and the cloth feed shaft 12, and a swing seat 11 connected to the cloth feed link assembly. The upper shaft passes through the cloth feed link assembly. The cloth feeding shaft 12 is driven to swing, and the swing range of the cloth feeding shaft 12 can be changed by adjusting the position angle of the swing seat 11 .

In the present invention, in order to effectively reduce the cost of products, reduce work procedures, and improve work efficiency, a drive motor 8 is provided on the casing 1. The drive motor 8 in this embodiment adopts a stepping motor, and the drive motor 8 A linkage assembly is provided between the output shaft 9 and the tangent crank 5, and the drive motor 8 drives the tangent crank 5 to do axial translation through the linkage assembly to realize the clutch switching between the tangent crank 5 and the tangent cam 7. The output shaft 9 is connected with the swing seat 11 of the reverse seam mechanism through the reverse seam transmission assembly 10 to drive the swing seat 11 to swing, so as to realize the reverse seam switching of the reverse seam mechanism.

The reverse seam transmission assembly 10 may adopt the cooperative transmission of the eccentric wheel and the connecting rod, or may use the cooperative transmission of the camshaft and the connecting rod.

In this embodiment, the thread trimming mechanism further includes a thread trimming crank shaft 6 , the thread trimming crank 5 is sleeved on the thread trimming crank shaft 6 , and the linkage assembly includes an adapter crank sleeved on the cloth feed shaft 12 13. The transfer crank 13 can rotate relative to the cloth feed shaft 12 in the circumferential direction, that is, the transfer crank 13 uses the cloth feed shaft 12 as the rotation axis, and the crank end of the transfer crank 13 is connected to the swing seat 11 through the connecting rod 14. , and the transfer crank 13 is intermittently linked with the tangent crank shaft 6, and after sewing to the maximum stitch length, the swing seat 11 continues to rotate through the connecting rod 14 to drive the transfer crank 13 to rotate, thereby driving the tangent crank shaft 6 and the tangent crank 5 toward the tangent cam Axial translation in 7 directions.

Among them, in order to realize that the swing seat 11 can only drive the axial translation of the tangential crank shaft 6 after the sewing to the maximum stitch length, the connection rod 14 and the swing seat 11 or between the tangent crank shaft 6 and the transfer crank 13 The connection should have a free stroke, that is, the matching structure between the connecting rod 14 and the swing seat 11 can be as follows: the corresponding end of the connecting rod 14 is hinged on the swing seat 11, at this time, the tangent crank shaft 6 and the transfer crank 13 are between The transmission has free travel. In this embodiment, the connecting rod 14 is provided with a bar-shaped sliding hole 15 along its axial direction, and the swing seat 11 is slidably connected in the bar-shaped sliding hole 15 through a plug-in pin. That is, the strip-shaped sliding hole 15 is used as a free stroke, and after the sewing to the maximum stitch length, the swing seat 11 abuts against the corresponding end surface of the strip-shaped sliding hole 15 through the plug-in pin, and then drives the transfer crank 13 by means of the connecting rod 14 to drive the tangent. Axial translation of the crankshaft 6 . Of course, the connecting rod 14 can also have a fork opening at its port, and the swing seat 11 is slidably connected in the fork opening through a plug pin.

Furthermore, in this embodiment, the specific cooperation structure between the adapter crank 13 and the tangential crank shaft 6 is: the adapter crank 13 is provided with a roller 17 , and the tangential crank shaft 6 and the casing are provided with a roller 17 . The return spring 18, and under the action of the elastic force of the return spring 18, the roller 17 can always be connected to the corresponding end face edge of the tangential crank shaft 6, and the adapter crank 13 drives the roller 17 to rotate to push the tangent crank shaft 6 to overcome the reset The elastic force of the spring 18 translates axially in the direction of the tangential cam 7 .

Of course, another matching structure can also be adopted between the transfer crank 13 and the tangential crank shaft 6 : the corresponding end surface of the transfer crank 13 is an irregular curved surface, and between the tangential crank shaft 6 and the casing 1 is provided The return spring 18, and under the action of the elastic force of the return spring 18, the corresponding end face of the tangential crank shaft 6 can always abut on the irregular curved surface, and the rotation of the adapter crank 13 enables the tangential crank shaft 6 to move along the irregular curved surface. Axial translation in the direction of the tangential cam 7 against the elastic force of the return spring 18 .

In addition, since the transfer crank 13 can be axially fixed on the cloth feed shaft 12, the cloth feed shafts 12 located on both sides of the transfer crank 13 are sleeved with locking rings 21, and the two locking rings 21 realize the transfer Axial limit of crank 13 .

In order to further reduce the cost of the product of the present invention, the drive motor 8 of the present invention can drive the wire-releasing mechanism to perform a wire-releasing action, and it also includes a wire-releasing mechanism and a wire-releasing wire rope 19 whose connection end is fixed on the wire-releasing mechanism. The thread-releasing plate member 20 is fixed on the tangent crank shaft 6, and the driving end of the wire-releasing wire rope 19 is fixed on the wire-releasing plate member 20. Do the thread-releasing action.

In addition, in order to enable the drive motor 8 of the present invention to also drive the presser foot lifting mechanism to perform the presser foot lifting action, it also includes a presser foot lifting mechanism and a rear lever 25 rotatably connected to the casing 1. The foot drive assembly is connected to the output shaft of the drive motor 8 . The presser foot lifter drive assembly can adopt the existing common structure, and in this embodiment, the front end of the rear lever 25 is provided with a rear lever fork 26, and the rear end is connected with the presser foot lifter mechanism. The drive assembly includes a drive wheel 27 sleeved on the output shaft 9 of the drive motor 8. The drive wheel 27 and one end of the lift-and-press drive rod 28 are rotated to realize clutching, and the other end of the lift-and-press drive rod 28 is hinged to the rotation of the drive plate 29. On the end, the connecting end of the driving plate 29 is rotatably connected to the casing 1 , and the rotating end is slidably connected to the rear lever fork 26 . That is, the driving motor 8 drives the rotation of the driving wheel 27, so that the driving wheel 27 is linked with the lifting and pressing driving rod 28, and then the rear lever 25 can be rotated by lifting and pressing the driving rod 28, so as to realize the lifting action of the foot lifting mechanism. .

The specific connection method between the presser foot lifter driving rod 28 and the driving wheel 27 may be that an arc-shaped chute is formed on the drive wheel 27, and the corresponding end of the presser foot-lifting driving rod 28 is slidably connected in the arc-shaped chute. Of course, it can also adopt the existing common mechanical clutch matching structure.

In the actual application process, the counterclockwise or clockwise rotation of the driving motor 8 can be controlled by the control box, so that the driving motor 8 can drive the rotation of the swing seat 11 through the eccentric wheel assembly 10, or the driving wheel 27 and the lifting and pressing the driving rod 28. Drive the rotation of the rear lever 25 to realize the reverse sewing action or the presser foot lifting action. The main shaft motor 3 drives the rotation of the main shaft 2, so that the main shaft 2 can drive the swing of the cloth feeding shaft 12 through the cloth feeding link assembly, so as to realize the feeding along the seam or the back seam feeding. At the same time, the main shaft 2 also drives the lower shaft through the transmission assembly. 4 and the thread cutting cam 7 rotate. When thread trimming is required, the drive motor 8 drives the swing seat 11 through the eccentric wheel assembly 10 to continue to rotate when the stitch length is maximum, and drives the tangent crank shaft 6 to move axially with the help of the linkage assembly, so that the tangent crank 5 and the tangent cam 7 can be Then, the thread trimming cam 7 drives the thread trimming crank 5 to rotate, causing the tool holder linked with the thread trimming crank 5 to rotate to realize the thread trimming action; at the same time, when the thread trimming crank shaft 6 is driven to move axially, the thread loosening steel rope 19 is used to pull the thread loosening. The mechanism makes a line-releasing action.

Therefore, the present invention can drive the reverse sewing mechanism, the presser foot lifting mechanism, the thread trimming mechanism and the thread loosening mechanism by means of a single motor, so as to realize the four functions of reverse sewing, presser foot lifting, thread trimming and thread loosening. The technology effectively reduces the cost of the product. The four functions are aggregated and controlled on a single motor, which significantly reduces the work procedure, improves the work efficiency, and makes the sewing machine operation simpler, more convenient and faster.

At the same time, in order to enhance the strength of the output shaft 9 of the drive motor 8, and to carry out an oil-proof design for the drive motor 8 to better play the driving role of the drive motor 8, the drive motor 8 includes a motor housing 30 , and the output shaft 9 rotatably connected in the motor housing 30, the front end of the motor housing 30 extends forward to form an extension portion 31 inserted on the housing 1, and the extension portion 31 is provided with a A through hole, the front end of the output shaft 9 penetrates the through hole outward into the casing 1, and an oil seal 32 is arranged between the output shaft 9 and the through hole, located between the extension 31 on the rear side of the through hole and the output shaft 9 A support bearing 33 is provided.

In order to further improve the sealing between the drive motor 8 and the casing 1 , an O-ring 34 sleeved on the extension portion 31 is provided between the front end surface of the motor casing 30 and the outer end surface of the casing 1 . .

Embodiment 2:

The structure of this embodiment is basically the same as that of the first embodiment above, and the main difference is that the thread trimming mechanism further includes a thread tangent crank shaft 6, the thread tangent crank 5 is sleeved on the thread tangent crank shaft 6, and the linkage assembly includes a Rotate the drive wire loose combination plate 22 connected to the casing 1, the output shaft 9 of the drive motor 8 is sleeved with a driving wheel 27, and one end of the drive wire loose combination plate 22 is close to the drive wire tangent crankshaft 6. One end of the thread loosening combination plate 22 is linked, and the other end is fixed with one end of the driving wire rope 24. The other end of the driving wire rope 24 is connected to the driving wheel 27, and the output shaft of the motor 8 is driven after sewing to the maximum stitch length. 9. Continue to rotate through the driving steel wire 24 to pull and drive the loosening combination plate 22 to rotate, thereby pushing the tangent crank shaft 6 and the tangent crank 5 to axially translate in the direction of the tangent cam 7. That is, in this embodiment, the output shaft 9 of the driving motor 8 drives the rotation of the driving wheel 27, and the winding driving steel rope 24 is used to pull and drive the rotation of the loosening assembly plate 22, thereby promoting the axial movement of the tangent crank shaft 6, and at the same time , the driving wheel 27 is also used to drive the presser foot lifting mechanism.

Further, the specific cooperation structure between the tangent crank shaft 6 and the driving wire loosening combination plate 22 is as follows: a return spring 18 is provided between the tangent crank shaft 6 and the casing 1, and the tangent crank shaft 6 is close to the driving wire loosening combination plate. One end of the 22 is a free end, and under the elastic force of the return spring 18, it always abuts on the corresponding end of the driving wire releasing combination plate 22. Under the pulling of the driving wire rope 24, the driving wire releasing combination plate 22 rotates and pushes the tangent crank shaft 6 to axially translate against the elastic force of the return spring 18. When the driving motor 8 rotates in the opposite direction, the elastic force of the return spring 18 The tangent crank shaft 6 , the driving wire releasing combination plate 22 and the driving wire rope 24 are reset.

At the same time, in the present embodiment, the drive motor 8 drives the wire-releasing mechanism to perform the wire-releasing transmission structure as follows: it also includes a wire-releasing mechanism and a wire-releasing steel rope 19 whose connection end is fixed on the wire-releasing mechanism. The driving end of the wire rope 19 is fixed on one end of the driving wire-releasing combination plate 22, and the driving wire-releasing combination plate 22 rotates through the wire-releasing wire rope 19 to pull the wire-releasing mechanism to perform the wire-releasing action.

Embodiment three:

The structure of this embodiment is basically the same as that of the first embodiment above, and the main difference is that: the thread trimming mechanism further includes a thread tangent crank shaft 6, the thread tangent crank 5 is sleeved on the thread tangent crank shaft 6, and the linkage assembly includes a sleeve The transfer crank 13 on the cloth feed shaft 12, the transfer crank 13 can rotate relative to the cloth feed shaft 12 in the circumferential direction, the crank end of the transfer crank 13 is connected to the swing seat 11 through the connecting rod 14 for transmission, and the transfer crank 13 Intermittently linked with the thread tangent crank 5, the swing seat 11 continues to rotate after sewing to the maximum stitch length through the connecting rod 14 to drive the transfer crank 13 to rotate, thereby driving the thread tangent crank 5 to translate axially in the direction of the thread tangent cam 7. That is, the thread trimming crank 5 is directly driven by the adapter crank 13 to perform axial translation, so that the thread trimming crank 5 is combined with the thread trimming cam 7 to realize the thread trimming action.

In this embodiment, the specific matching structure between the transfer crank 13 and the tangent crank 5 is as follows: the casing 1 is rotatably connected with a wire loosening plate 20 , the wire loosening plate 20 is provided with a roller 17 , and the tangent crank 5 A return spring 18 is provided between the housing 1 and the adapter crank 13, and an arc-shaped toggle lever 35 is provided. The plate 20 pushes the tangential crank 5 to axially translate in the direction of the tangential cam 7 against the elastic force of the return spring 18 .

At the same time, the transmission structure of the drive motor 8 driving the loosening mechanism to perform the thread loosening action is as follows: it also includes a thread loosening mechanism and a loosening wire rope 19 whose connecting end is fixed on the thread loosening mechanism. The driving end of the loosening wire rope 19 It is fixed on the loosening plate member 20, and is rotated by the loosening plate member 20, and the loosening mechanism is pulled by the loosening wire rope 19 to perform the thread loosening action.

The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and is not intended to limit the scope of implementation of the present invention. Therefore: all equivalent changes made according to the shape, structure and principle of the present invention should be covered by the present invention. within the scope of protection.

Claims

A sewing machine comprises an organic casing (1), a reverse sewing mechanism, a thread trimming mechanism, a main shaft (2) and a main shaft motor (3). The thread trimming mechanism comprises a thread trimming crank (5) and a thread trimming cam (7) sleeved on the lower shaft (4). The casing (1) is provided with a drive motor (8), a linkage assembly is provided between the output shaft (9) of the drive motor (8) and the tangent crank (5), and the drive motor (8) drives the tangent through the linkage assembly The crank (5) is axially translated, and the output shaft (9) of the driving motor (8) is connected with the swing seat (11) of the reverse seam mechanism through the reverse seam transmission assembly (10) to drive the swing seat (11) to swing. , In order to realize the reverse sewing switch of the reverse sewing mechanism.
A sewing machine according to claim 1, characterized in that: the thread trimming mechanism further comprises a thread trimming crank shaft (6), the thread trimming crank (5) is sleeved on the thread trimming crank shaft (6), and the linkage The assembly includes an adapter crank (13) sleeved on the cloth feed shaft (12), the adapter crank (13) can rotate in the circumferential direction relative to the cloth feed shaft (12), and the crank end of the adapter crank (13) is connected by The rod (14) is connected to the swing seat (11) by transmission, and the transfer crank (13) is intermittently linked with the tangent crank shaft (6). After sewing to the maximum stitch length, the swing seat (11) continues to rotate through the connecting rod (14). The transfer crank (13) is driven to rotate, thereby driving the tangent crank shaft (6) and the tangent crank (5) to axially translate in the direction of the tangent cam (7).
A sewing machine according to claim 1, characterized in that: the thread trimming mechanism further comprises a thread trimming crank shaft (6), the thread trimming crank (5) is sleeved on the thread trimming crank shaft (6), and the linkage The assembly includes an adapter crank (13) sleeved on the cloth feed shaft (12), the adapter crank (13) can rotate in the circumferential direction relative to the cloth feed shaft (12), and the crank end of the adapter crank (13) is connected by The rod (14) is connected to the swing seat (11) by transmission, and the transfer crank (13) is intermittently linked with the tangent crank (5). After sewing to the maximum stitch length, the swing seat (11) continues to rotate and is driven by the connecting rod (14). The transfer crank (13) rotates, thereby driving the tangent crank (5) to axially translate in the direction of the tangent cam (7).
A sewing machine according to claim 2 or 3, characterized in that: the connecting rod (14) is provided with a strip-shaped sliding hole (15) along its axial direction, and the swing seat (11) is inserted through a plug pin It is slidably connected in the bar-shaped sliding hole (15).
A sewing machine according to claim 2 or 4, characterized in that: the adapter crank (13) is provided with a roller (17), and a tangent crank shaft (6) and the casing (1) are provided with a roller (17). The return spring (18), the roller (17) is in contact with the edge of the corresponding end face of the tangent crank shaft (6), and the transfer crank (13) drives the roller (17) to rotate to push the tangent crank shaft (6) to overcome the return spring The elastic force of (18) translates axially in the direction of the tangent cam (7).
A sewing machine according to claim 2, characterized in that it further comprises a thread loosening mechanism and a thread loosening steel rope (19) whose connecting end is fixed on the thread loosening mechanism, and the thread cutting crank shaft (6) is fixed with a loosening wire rope (19). The wire plate member (20), the driving end of the wire-releasing steel rope (19) is fixed on the wire-releasing plate member (20), the tangent crank shaft (6) is axially translated, and the wire-releasing wire is pulled by the wire-releasing wire rope (19). The mechanism makes a line-releasing action.
A sewing machine according to claim 3, characterized in that a thread loosening plate (20) is rotatably connected to the casing (1), the thread loosening plate (20) is provided with a roller (17), and a thread tangent crank ( 5) A return spring (18) is arranged between the casing (1), the adapter crank (13) is provided with an arc-shaped toggle lever (35), and the arc-shaped toggle lever (35) can be rotated through a roller (17) Push the thread release plate (20) to rotate, and then the thread release plate (20) pushes the tangent crank (5) to axially translate in the direction of the tangent cam (7) against the elastic force of the return spring (18).
A sewing machine according to claim 7, characterized in that it further comprises a thread release mechanism and a thread release wire rope (19) whose connecting end is fixed on the thread release mechanism, and the drive end of the thread release wire rope (19) is fixed On the thread releasing plate (20), the thread releasing mechanism is pulled by the thread releasing plate (20) to perform the thread releasing action by pulling the thread releasing steel rope (19).
A sewing machine according to claim 2 or 3, characterized in that: locking rings (21) are sleeved on the cloth feed shafts (12) located on both sides of the transfer crank (13).
A sewing machine according to claim 1, wherein the thread trimming mechanism further comprises a thread trimming crank shaft (6), the thread trimming crank (5) is sleeved on the thread trimming crank shaft (6), and the thread trimming crank shaft (6) is sleeved. The linkage assembly includes a drive wire release combination plate (22) rotatably connected to the casing (1), and a drive wheel (27) is sleeved on the output shaft (9) of the drive motor (8) to drive the wire release combination. One end of the plate (22) is linked with one end of the tangent crankshaft (6) close to the driving wire release combination plate (22), and the other end is fixed with one end of the driving wire rope (24), and the driving wire rope (24) is The other end is connected to the driving wheel (27), and after sewing to the maximum stitch length, the output shaft (9) of the driving motor (8) continues to rotate through the driving wire rope (24) to pull the driving thread release combination plate (22) to rotate. , and then push the tangent crank shaft (6) and the tangent crank (5) to axially translate in the direction of the tangent cam (7).
A sewing machine according to claim 10, characterized in that a return spring (18) is arranged between the thread tangent crank shaft (6) and the casing (1), and the thread tangent crank shaft (6) is close to the drive thread release assembly One end of the plate (22) is a free end, and abuts on the corresponding end of the driving wire releasing combination plate (22).
A sewing machine according to claim 10, characterized in that it further comprises a thread release mechanism and a thread release wire rope (19) whose connecting end is fixed on the thread release mechanism, and the driving end of the thread release wire rope (19) is fixed On one end of the driving thread loosening combination plate (22), the thread loosening mechanism is pulled by the driving thread loosening combination plate (22) through the thread loosening wire rope (19) to pull the thread loosening action.
A sewing machine according to claim 1 or 2 or 3 or 10, characterized in that it further comprises a presser foot lifting mechanism, and a rear lever (25) rotatably connected to the casing (1), and the rear lever is lifted by lifting the presser foot. The presser foot drive assembly is connected with the output shaft of the drive motor (8).
A sewing machine according to claim 13, characterized in that: the front end of the rear lever (25) is provided with a rear lever fork (26), and the rear end is connected to the presser foot lifter, and the presser foot lifter drive assembly It includes a driving wheel (27) sleeved on the output shaft (9) of the driving motor (8), the driving wheel (27) and one end of the lifting and pressing driving rod (28) are rotated to realize the clutch, and the lifting and pressing driving rod (28) The other end of the drive plate (29) is hinged on the rotating end of the drive plate (29), the connecting end of the drive plate (29) is rotatably connected to the casing (1), and the rotating end is slidably connected to the rear lever fork (26).
A sewing machine according to claim 1 or 2 or 3 or 10, characterized in that: the drive motor (8) includes a motor housing (30) and is rotatably connected in the motor housing (30). The output shaft (9) of the motor casing (30) extends forward to form an extension (31) inserted on the casing (1), and the extension (31) is provided with a through hole along its axial direction. The front end of the output shaft (9) protrudes out of the through hole into the casing (1), and an oil seal (32) is arranged between the output shaft (9) and the through hole, and is located at the extension of the rear side of the through hole A support bearing (33) is provided between (31) and the output shaft (9).
A sewing machine according to claim 15, characterized in that: between the front end face of the motor casing (30) and the outer end face of the casing (1), a sewing machine sleeved on the extension part (31) is provided. O-ring (34).