CN218711383U - Sewing machine lifts presser foot, gauge needle regulation and trimming drive arrangement - Google Patents

Abstract

The utility model belongs to the technical field of sewing equipment, in particular to a sewing machine presser foot lifting, needle distance adjusting and thread trimming driving device, which is used for respectively driving a presser foot lifting mechanism on a sewing machine to execute the action of presser foot lifting, a needle distance adjusting mechanism to execute the action of needle distance adjusting and a thread trimming mechanism to execute the action of thread trimming, and comprises a driving source, a presser foot lifting cam, a presser foot lifting crank component, a needle distance control cam, a needle distance control pull rod and a thread trimming driving crank; the utility model discloses a presser foot is lifted in the drive respectively of a driving source, gauge needle is adjusted and the action of thread trimming mechanism, has reduced manufacturing cost effectively, compact structure, and occupation space is little.

Description

Sewing machine lifts presser foot, gauge needle regulation and trimming drive arrangement

The technical field is as follows:

the utility model belongs to the technical field of sewing equipment, refer in particular to a sewing machine lifts presser foot, gauge needle regulation and trimming drive arrangement.

Background art:

the sewing machine is a machine which uses one or more sewing threads to form one or more stitches on a sewing material to enable one or more layers of the sewing material to be interwoven or sewed, can be used for sewing fabrics such as cotton, hemp, silk, wool, artificial fiber and the like and products such as leather, plastics, paper and the like, and has the advantages of tidy, beautiful, smooth and firm sewed stitches, high sewing speed and simple and convenient use. The sewing machine comprises a needle pitch adjusting mechanism, a presser foot lifting mechanism and the like. In the traditional sewing machine, the movement of the mechanism needs manual operation of a user to realize control, and the operation is inconvenient and the efficiency is low.

In order to solve the above problems, chinese invention patent (publication No. CN 113430727A, published japanese patent No. 2021.09.24) discloses a sewing machine having a novel presser foot lifting structure and a thread trimming structure, which realizes the thread trimming action and the presser foot lifting action by the positive and negative rotation of a single stepping motor (a first motor) through the structure of a linkage shaft sleeve, and drives a needle pitch adjusting assembly to perform the needle pitch adjustment by a second motor. That is, the above patent implements the execution of the actions of the three mechanisms of the needle pitch adjusting mechanism, the thread cutting mechanism and the presser foot lifting mechanism by two motors. The structure uses two motors for driving, which causes the defects of high cost, large occupied space and the like.

The invention content is as follows:

the utility model aims at providing a sewing machine that with low costs, compact structure lifts presser foot, gauge needle regulation and trimming drive arrangement.

The utility model discloses a realize like this:

a sewing machine lifts presser foot, gauge needle regulation and trimming drive arrangement includes:

a drive source having a first shaft and a second shaft; the presser foot lifting cam is fixedly arranged on the first rotating shaft and comprises a presser foot lifting driving section, a needle pitch adjusting section and a trimming idle section I; the pressure foot lifting crank assembly is arranged on the feeding shaft, the input end of the pressure foot lifting crank assembly is provided with a pressure foot lifting roller, the output end of the pressure foot lifting crank assembly is connected with a pressure foot lifting mechanism, and the pressure foot lifting roller rolls on the pressure foot lifting driving section to drive the pressure foot lifting crank assembly to rotate so as to control the action of the pressure foot lifting mechanism; the needle pitch control cam is fixedly arranged on the first rotating shaft and comprises a needle pitch adjusting section, a presser foot lifting idling section and a thread trimming idling section II; the needle gage control pull rod is sleeved outside the mounting part of the needle gage control cam, one end of the needle gage control pull rod is connected with the needle gage adjusting mechanism, and the other end of the needle gage control pull rod is provided with a needle gage adjusting roller which rolls at the needle gage adjusting section to drive the needle gage control pull rod to rotate so as to control the needle gage adjusting mechanism to adjust the needle gage; and the trimming driving crank is fixedly arranged on the second rotating shaft and can be contacted with the trimming mechanism and drive the trimming mechanism to execute trimming action.

In the above mentioned sewing machine presser foot lifting, stitch length adjusting and thread trimming driving device, the presser foot lifting idle section and the thread trimming idle section two are zero stitch length sections.

In the above mentioned device for lifting presser foot, adjusting needle pitch and driving thread trimming of sewing machine, the outer contour surface of the needle pitch control cam is provided with a spacing section between the second idle section of lifting presser foot and the second idle section of thread trimming.

In the above device for lifting presser foot, adjusting needle pitch and driving thread trimming of a sewing machine, a first transition section is arranged between the idle rotation section of the presser foot lifting and the needle pitch adjusting section, one end of the needle pitch adjusting section adjacent to the idle rotation section of the thread trimming is a maximum needle pitch position, one end of the needle pitch adjusting section adjacent to the first transition section is a minimum needle pitch position, and the distance from the maximum needle pitch position and the minimum needle pitch position to the center of the needle pitch control cam is gradually increased.

In the above mentioned device for presser foot lifting, needle pitch adjustment and thread trimming driving of sewing machine, a second transition section is arranged between the presser foot lifting driving section and the first needle pitch adjustment and thread trimming idle section, one end of the presser foot lifting driving section adjacent to the first needle pitch adjustment and thread trimming idle section is a presser foot lifting lowest position, one end of the presser foot lifting driving section adjacent to the second transition section is a presser foot lifting highest position, and the distance from the presser foot lifting lowest position and the presser foot lifting highest position to the center of the presser foot lifting cam is gradually increased

In the above sewing machine presser foot lifting, needle pitch adjusting and thread trimming driving device, the presser foot lifting crank assembly includes a presser foot lifting crank connecting sleeve, two ends of the presser foot lifting crank connecting sleeve are respectively provided with a presser foot lifting crank and a presser foot lifting crank rod, two ends of the presser foot lifting crank connecting sleeve are respectively provided with a protrusion, the presser foot lifting crank and the presser foot lifting crank rod are both provided with a groove, the protrusions are respectively inserted into the grooves of the presser foot lifting crank and the presser foot lifting crank rod, the other end of the presser foot lifting crank is provided with a presser foot lifting roller, and the other end of the presser foot lifting crank rod is hinged with a presser foot lifting ejector rod of the presser foot lifting mechanism.

In the presser foot lifting, stitch length adjusting and thread trimming driving device for the sewing machine, the presser foot lifting crank is connected with a second tension spring, one end of the second tension spring is connected with the presser foot lifting crank, and the other end of the second tension spring is connected to the tension spring fixing plate, so that the presser foot lifting roller is always attached to the outer contour surface of the presser foot lifting cam, and the tension spring fixing plate is arranged on the driving source or the base plate.

In the above mentioned sewing machine presser foot lifting and needle pitch adjusting and thread trimming driving device, the other end of the needle pitch control pull rod is connected with one end of a first tension spring, and the other end of the first tension spring is connected to the base plate so that the needle pitch adjusting roller is always attached to the outer contour surface of the needle pitch control cam.

In the above device for lifting the presser foot, adjusting the needle pitch and driving the thread trimming of the sewing machine, one end of the needle pitch control pull rod is connected with the needle pitch control shaft through the needle pitch adjusting crank, the needle pitch control shaft is connected with the swing seat of the needle pitch adjusting mechanism, and the swing seat is arranged on the bottom plate in a swing manner through the needle pitch control shaft and the fixed pin of the feeding swing seat.

In the presser foot lifting, stitch length adjusting and thread cutting driving device for the sewing machine, the thread cutting driving crank is provided with the thread cutting idler wheel, the thread cutting mechanism comprises the thread cutting crank driving shaft, one end of the thread cutting crank driving shaft is provided with the shifting rod, and the thread cutting idler wheel can contact with the shifting rod to drive the shifting rod to rotate so as to drive the thread cutting mechanism to perform thread cutting action.

Compared with the prior art, the utility model outstanding advantage is:

1. the utility model has the advantages that the production cost is effectively reduced, the structure is compact, and the occupied space is small by respectively driving the pressure raising and pressing foot, the stitch length adjustment and the thread trimming mechanism to act through one driving source;

2. lift presser foot idle running section, trimming idle running section two and be zero gauge length section, the feed dog is located the position of zero gauge length promptly, is carrying out the trimming, lifting the presser foot in-process, and the feed dog is located the position of zero gauge length always, has eliminated the feed dog and has exceeded the faller and to the damage that the sewing material caused, and simultaneously, the suture on the eedle can not drop yet, ensures that sewing work can not be because of taking off the line and interrupt.

Description of the drawings:

fig. 1 is one of the schematic perspective views of the present invention;

fig. 2 is a second perspective view of the present invention;

fig. 3 is a third perspective view of the present invention;

fig. 4 is a schematic view of a pitch control cam of the present invention;

fig. 5 is a schematic view of a presser foot lifting cam of the present invention;

FIG. 6 is a schematic view of the gauge control tie bar of the present invention;

fig. 7 is a schematic view of a drive source of the present invention;

fig. 8 is a schematic view of the trimming drive crank of the present invention;

fig. 9 is a schematic view of the lift and presser foot crank assembly of the present invention.

In the figure: 1. a drive source; 2. lifting a presser foot cam; 3. a presser foot lifting crank assembly; 4. a needle pitch control cam; 5. a stitch length control pull rod; 6. a trimming drive crank; 7. a first rotating shaft; 8. a second rotating shaft; 9. a support; 10. lifting a presser foot driving section; 11. a needle pitch adjusting and thread cutting idle section I; 12. a feed shaft; 13. a pressure foot lifting crank connecting sleeve; 14. lifting a presser foot crank; 15. lifting a crank rod of the presser foot; 16. a protrusion; 17. lifting a presser foot roller; 18. lifting a presser foot ejector rod; 19. positioning a retainer ring; 20. a needle pitch adjusting section; 21. lifting the idle section of the presser foot; 22. a trimming idling section II; 23. a needle pitch adjusting roller; 24. a limiting section; 25. a needle pitch adjusting crank; 26. A needle pitch control shaft; 27. a swing seat; 28. a fixed pin of the feeding swing seat; 29. a second tension spring; 30. a tension spring fixing plate; 31. a first tension spring; 32. trimming rollers; 33. a trimming crank drive shaft; 34. a deflector rod; 35. Moving a knife; 36. fixing a cutter; 37. a waist-shaped hole; 38. a needle pitch control pull rod limit retainer ring; 39. a first transition section; 40. a second transition section.

The specific implementation mode is as follows:

the invention is further described below with reference to specific embodiments:

referring to fig. 1-3, the present invention relates to a presser foot lifting, needle pitch adjusting and thread trimming driving device for driving a presser foot lifting mechanism on a sewing machine to perform a presser foot lifting action, a needle pitch adjusting mechanism to perform a needle pitch adjusting action and a thread trimming mechanism to perform a thread trimming action. Wherein, lift presser foot mechanism, gauge needle adjustment mechanism and thread trimming mechanism and be the conventional structure on the sewing machine, the concrete structure of above-mentioned three mechanism the utility model discloses do not do the detailed description. The utility model discloses a sewing machine lifts presser foot, gauge needle regulation and trimming drive arrangement includes driving source 1, lifts presser foot cam 2, lifts presser foot crank subassembly 3, gauge needle control cam 4, gauge needle control pull rod 5 and trimming drive crank 6.

Referring to fig. 1 and 7, the driving source 1 is preferably a stepping motor, which is a double-head motor having a first rotating shaft 7 and a second rotating shaft 8, and the first rotating shaft 7 and the second rotating shaft 8 rotate synchronously. The rotating precision of the first rotating shaft 7 and the second rotating shaft 8 of the stepping motor is higher, so that the adjustment of the height of the presser foot lifting and the needle pitch can be better controlled. The driving source 1 is fixedly arranged on a bottom plate of the sewing machine through a bracket 9. Generally, a sewing machine includes a housing and a bed. The rotation angles of the first rotating shaft 7 and the second rotating shaft 8 of the driving source 1 are controlled by a controller.

Referring to fig. 1-3, a pressure raising and pressing foot cam 2 and a needle gauge control cam 4 are fixedly arranged on the first rotating shaft 7. The pressure foot lifting cam 2 and the needle pitch control cam 4 both comprise a cam part and a mounting part, more than one threaded hole is radially arranged on the mounting part, and the pressure foot lifting cam 2 and the needle pitch control cam 4 are fixedly arranged on the first rotating shaft 7 in the threaded holes through screw threads. And a trimming driving crank 6 is fixedly arranged on the second rotating shaft 8. The pressure raising and pressing foot cam 2 and the needle pitch control cam 4 rotate along with the first rotating shaft 7. One end of the trimming driving crank 6 is sleeved on the second rotating shaft 8 and is fixedly arranged on the second rotating shaft 8 through a fastener, and the other end is suspended in the air. The trimming drive crank 6 rotates synchronously with the second rotating shaft 8.

Further, referring to fig. 5, the presser foot lifting cam 2 includes a presser foot lifting driving section 10 and a first needle distance adjusting and first thread trimming idling section 11, a second transition section 40 is further disposed between the presser foot lifting driving section 10 and the first needle distance adjusting and first thread trimming idling section 11, one end of the presser foot lifting driving section 10 adjacent to the first needle distance adjusting and first thread trimming idling section 11 is a presser foot lifting lowest position, one end of the presser foot lifting driving section adjacent to the second transition section 40 is a presser foot lifting highest position, and a distance from the presser foot lifting lowest position and the presser foot lifting highest position to a center of the presser foot lifting cam 2 gradually increases. The starting point and the end point of the needle pitch adjusting and trimming idle section I11 are equal to the distance from the center of the presser foot lifting cam 2.

Referring to fig. 2 and 9, the pressure foot lifting crank assembly 3 includes a pressure foot lifting crank connecting sleeve 13 sleeved on the feeding shaft 12, two ends of the pressure foot lifting crank connecting sleeve 13 are respectively provided with a pressure foot lifting crank 14 and a pressure foot lifting crank rod 15, two ends of the pressure foot lifting crank connecting sleeve 13 are respectively provided with a protrusion 16, the pressure foot lifting crank 14 and the pressure foot lifting crank rod 15 are both provided with a groove, the protrusions 16 are respectively inserted into the grooves of the pressure foot lifting crank 14 and the pressure foot lifting crank rod 15, the other end of the pressure foot lifting crank 14 is provided with a pressure foot lifting roller 17, and the other end of the pressure foot lifting crank rod 15 is hinged with a pressure foot lifting ejector rod 18 of the pressure foot lifting mechanism. The pressure foot lifting roller 17 can be replaced by a bearing and the like, so that the friction force can be reduced, and the rolling is more flexible.

In order to realize right lift presser foot crank 14 and lift presser foot crank rod 15 is spacing in the axial on pay-off axle 12, the utility model discloses lift presser foot crank 14 and lift presser foot crank rod 15 outer end and be provided with location retaining ring 19 respectively. The positioning retainer ring 19 is fixedly arranged on the feeding shaft 12. Of course, the positioning retainer 19 can be replaced by a snap spring.

The pressure foot lifting crank 14 is an input end of the pressure foot lifting crank assembly 3, and the pressure foot lifting crank rod 15 is an output end of the pressure foot lifting crank assembly 3. The presser foot lifting idler wheel 17 rolls on the presser foot lifting driving section 10, and as the distance from the presser foot lifting driving section 10 to the center of the presser foot lifting cam 2 gradually increases or decreases, the presser foot lifting crank 14 is driven to rotate, the presser foot lifting crank 14 drives the presser foot lifting crank rod 15 to rotate through the presser foot lifting crank connecting sleeve 13, and finally the presser foot lifting ejector rod 18 is driven to act, so that the action of the presser foot lifting mechanism is realized. Different positions of the presser foot lifting roller 17 on the presser foot lifting driving section 10 can control different heights of the presser foot. The utility model discloses when carrying out the action of trimming or gauge needle regulation, lift presser foot gyro wheel 17 and roll on gauge needle is adjusted and trimming idle section 11, at this moment, do not carry and lift the presser foot action.

Referring to fig. 2, in order to realize lifting presser foot gyro wheel 17 and rolling on lifting presser foot cam 2's outer profile face all the time, the utility model discloses be provided with second extension spring 29 on lifting presser foot crank 14, second extension spring 29's one end is hung and is established corresponding downthehole on lifting presser foot crank 14, another is hung and is established corresponding downthehole on extension spring fixed plate 30. The tension spring fixing plate 30 is fixedly arranged on the end face or the bottom plate of the driving source 1. The present embodiment is preferably provided on an end face of the drive source 1.

Further, referring to fig. 4, the needle gage control cam 4 includes a needle gage adjusting section 20, a presser foot lifting idle section 21 and a second trimming idle section 22, and a limiting section 24 is disposed on the outer contour surface of the needle gage control cam 4 between the presser foot lifting idle section 21 and the second trimming idle section 22. The limiting section 24 can ensure that the lifting foot idle section 21 and the trimming idle section two 22 are independent. A first transition section 39 is arranged between the pressure lifting foot idling section 21 and the needle distance adjusting section 20, one end of the needle distance adjusting section 20 adjacent to the second trimming idling section 22 is a maximum needle distance position, one end of the needle distance adjusting section adjacent to the first transition section 39 is a minimum needle distance position, and the distance from the maximum needle distance position and the minimum needle distance position to the center of the needle distance control cam 4 is gradually increased.

Referring to fig. 2 and 6, a waist-shaped hole 37 is formed in the middle of the needle pitch control pull rod 5, the needle pitch control pull rod 5 is sleeved outside the mounting portion of the needle pitch control cam 4 through the waist-shaped hole 37, and axial limiting is performed through a needle pitch control pull rod limiting retainer ring 38. One end of the needle pitch control pull rod 5 is connected with the needle pitch adjusting mechanism, the other end of the needle pitch control pull rod is provided with a needle pitch adjusting roller 23, and the needle pitch adjusting roller 23 rolls in the needle pitch adjusting section 20 to drive the needle pitch control pull rod 5 to rotate so as to control the needle pitch adjusting mechanism to adjust the needle pitch. The needle pitch adjusting roller 23 can be replaced by a bearing and the like, so that the friction force can be reduced, and the rolling is more flexible.

The pressure raising and pressing foot idle section 21 and the thread trimming idle section two 22 are zero-gauge sections, namely, the feed dog is positioned at a zero-gauge position. In the process of trimming and lifting the presser foot, the feed dog is always positioned at the position with zero needle pitch, so that the damage to sewing materials caused by the fact that the feed dog is higher than the needle plate is eliminated, meanwhile, the sewing thread on the needle cannot fall off, and the sewing work cannot be interrupted due to thread falling.

The utility model discloses in, lift presser foot idle running section 21 and the purpose that trimming idle running section two 22 set up is: when the presser foot lifting action is executed, the needle distance adjusting roller 23 rolls on the presser foot lifting idle section 21 without driving the needle distance adjusting mechanism to act; when the thread cutting action is executed, the stitch length adjusting roller 23 rolls on the second thread cutting idle section 22 without driving the stitch length adjusting mechanism to act.

In order to realize that gauge needle regulating roller 23 rolls on the outer profile face of gauge needle control cam 4 all the time, the utility model discloses be provided with first extension spring 31 at the other end of gauge needle control pull rod 5, the one end of first extension spring 31 is hung and is established corresponding downthehole on gauge needle control pull rod 5, and the other end is connected on the bottom plate.

Referring to fig. 1-3, in the utility model discloses in, the one end of gauge needle control pull rod 5 is passed through gauge needle adjusting crank 25 and is connected with gauge needle control shaft 26, gauge needle control shaft 26 is connected with gauge needle adjustment mechanism's swing seat 27, swing seat 27 sets up on the bottom plate through gauge needle control shaft 26, the swing seat fixed pin 28 swing of pay-off, gauge needle control shaft 26, the swing seat fixed pin 28 coaxial line setting of pay-off.

Further, referring to fig. 1 and 3, the hanging end of the thread cutting driving crank 6 is provided with a thread cutting roller 32, and the thread cutting driving crank 6 can contact with the thread cutting mechanism and drive the thread cutting mechanism to perform thread cutting.

Specifically, the thread trimming mechanism comprises a thread trimming crank drive shaft 33, a shifting lever 34 is arranged at one end of the thread trimming crank drive shaft 33, and the thread trimming roller 32 can contact with the shifting lever 34 to drive the shifting lever 34 to rotate so as to drive the thread trimming mechanism to perform thread trimming. The thread trimming roller 32 may be replaced by a bearing or the like, which reduces the friction with the shift lever 34.

When the second rotating shaft 8 rotates until the thread trimming roller 32 contacts and connects with the shift lever 34, the second rotating shaft 8 continues to rotate, which drives the shift lever 34 to rotate, and finally drives the movable knife 35 to rotate, and performs thread trimming with the fixed knife 36.

The utility model discloses a theory of operation:

the controller controls the stepping motor to work, the first rotating shaft 7 and the second rotating shaft 8 start to rotate, and the presser foot lifting cam 2, the stitch length control cam 4 and the thread cutting driving crank 6 rotate together.

When the presser foot is to be lifted, the presser foot lifting roller 17 rolls on the presser foot lifting driving section 10 of the presser foot lifting cam 2, the presser foot lifting crank assembly 3 is driven to rotate to drive the presser foot lifting ejector rod 18 of the presser foot lifting mechanism to act so as to further execute the presser foot lifting action, at the moment, the stitch length adjusting roller 23 rolls on the presser foot lifting idle section 21 of the stitch length control cam 4, the thread trimming roller 32 of the thread trimming driving crank 6 is not in contact with the thread trimming mechanism, and the stitch length adjusting mechanism and the thread trimming mechanism execute idle stroke, so that the stitch length adjustment and the thread trimming action are not performed;

when needle pitch is required to be adjusted, the needle pitch adjusting roller 23 rolls on the needle pitch adjusting section 20 of the needle pitch control cam 4 to drive the needle pitch control pull rod 5 to rotate so as to control the needle pitch adjusting mechanism to adjust the needle pitch, at the moment, the presser foot lifting roller 17 rolls on the needle pitch adjusting and trimming idle section I11 of the presser foot lifting cam 2, the trimming roller 32 of the trimming drive crank 6 is not in contact with the trimming mechanism, and the presser foot lifting mechanism and the trimming mechanism execute idle stroke, so that presser foot lifting and trimming actions are not carried out;

when the thread trimming is to be performed, the thread trimming roller 32 of the thread trimming driving crank 6 contacts with the deflector rod 34 of the thread trimming mechanism to drive the deflector rod 34 to rotate so as to drive the thread trimming mechanism to perform the thread trimming action, at the moment, the stitch length adjusting roller 23 rolls on the second thread trimming idle section 22 of the stitch length control cam 4, the presser foot lifting roller 17 rolls on the stitch length adjusting and first thread trimming idle section 11 of the presser foot lifting cam 2, and the stitch length adjusting mechanism and the presser foot lifting mechanism perform idle strokes, so that the stitch length adjusting and the presser foot lifting action are not performed.

The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so: all equivalent changes made according to the shape, structure and principle of the utility model are covered within the protection scope of the utility model.

Claims (10)

1. The utility model provides a sewing machine lifts presser foot, gauge needle regulation and trimming drive arrangement which characterized in that: the method comprises the following steps:

a drive source (1), the drive source (1) having a first shaft (7) and a second shaft (8);

the presser foot lifting cam (2) is fixedly arranged on the first rotating shaft (7), and the presser foot lifting cam (2) comprises a presser foot lifting driving section (10), a needle pitch adjusting and trimming idle section I (11);

the presser foot lifting crank assembly (3) is arranged on the feeding shaft (12), the input end of the presser foot lifting crank assembly (3) is provided with a presser foot lifting roller (17), the output end of the presser foot lifting crank assembly is connected with the presser foot lifting mechanism, and the presser foot lifting roller (17) rolls on the presser foot lifting driving section (10) to drive the presser foot lifting crank assembly (3) to rotate so as to control the action of the presser foot lifting mechanism;

the needle pitch control cam (4) is fixedly arranged on the first rotating shaft (7), and the needle pitch control cam (4) comprises a needle pitch adjusting section (20), a presser foot lifting idle section (21) and a second trimming idle section (22);

the needle pitch control mechanism is characterized by comprising a needle pitch control pull rod (5) which is sleeved outside an installation part of a needle pitch control cam (4), one end of the needle pitch control pull rod (5) is connected with the needle pitch adjusting mechanism, the other end of the needle pitch control pull rod is provided with a needle pitch adjusting roller (23), and the needle pitch adjusting roller (23) rolls in a needle pitch adjusting section (20) to drive the needle pitch control pull rod (5) to rotate so as to control the needle pitch adjusting mechanism to adjust the needle pitch;

and the trimming driving crank (6) is fixedly arranged on the second rotating shaft (8), and the trimming driving crank (6) can be in contact with the trimming mechanism and drives the trimming mechanism to execute trimming.

2. The sewing machine presser foot lifting, gauge adjustment and thread trimming drive device according to claim 1, wherein: the pressure foot lifting idle section (21) and the second thread trimming idle section (22) are zero-gauge sections.

3. The sewing machine presser foot lifting, gauge adjustment and thread trimming drive device according to claim 1 or 2, wherein: and a limiting section (24) is arranged between the pressure raising and pressing foot idling section (21) and the trimming line idling section II (22) on the outer contour surface of the needle pitch control cam (4).

4. The sewing machine presser foot lifting, gauge adjustment and thread trimming drive device according to claim 1 or 2, wherein: a first transition section (39) is arranged between the pressure raising and pressing foot idling section (21) and the needle distance adjusting section (20), one end, adjacent to the second trimming idling section (22), of the needle distance adjusting section (20) is a maximum needle distance position, one end, adjacent to the first transition section (39), of the needle distance adjusting section is a minimum needle distance position, and the distance from the maximum needle distance position and the minimum needle distance position to the center of the needle distance control cam (4) is gradually increased.

5. The sewing machine presser foot lifting, gauge adjustment and thread trimming drive device according to claim 1, wherein: a second transition section (40) is arranged between the presser foot lifting driving section (10) and the first needle distance adjusting and trimming idle section (11), one end of the presser foot lifting driving section (10) adjacent to the first needle distance adjusting and trimming idle section (11) is a presser foot lifting lowest position, one end of the presser foot lifting driving section adjacent to the second transition section (40) is a presser foot lifting highest position, and the distance from the presser foot lifting lowest position and the presser foot lifting highest position to the center of the presser foot lifting cam (2) is gradually increased.

6. The sewing machine presser foot lifting, gauge adjustment and thread trimming drive device according to claim 1, wherein: the pressure foot lifting crank assembly (3) comprises a pressure foot lifting crank connecting sleeve (13), two ends of the pressure foot lifting crank connecting sleeve (13) are respectively provided with a pressure foot lifting crank (14) and a pressure foot lifting crank rod (15), two ends of the pressure foot lifting crank connecting sleeve (13) are respectively provided with a bulge (16), the pressure foot lifting crank (14) and the pressure foot lifting crank rod (15) are respectively provided with a groove, the bulges (16) are respectively inserted into the grooves of the pressure foot lifting crank (14) and the pressure foot lifting crank rod (15), the other end of the pressure foot lifting crank (14) is provided with a pressure foot lifting roller (17), and the other end of the pressure foot lifting crank rod (15) is hinged with a pressure foot lifting rod (18) of a pressure foot lifting mechanism.

7. The device for lifting presser foot, adjusting needle pitch and driving thread trimming of sewing machine as claimed in claim 6, wherein: the presser foot lifting crank (14) is connected with a second tension spring (29), one end of the second tension spring (29) is connected with the presser foot lifting crank (14), the other end of the second tension spring is connected onto a tension spring fixing plate (30), so that the presser foot lifting roller (17) is always attached to the outer contour surface of the presser foot lifting cam (2), and the tension spring fixing plate (30) is arranged on the driving source (1) or the bottom plate.

8. The sewing machine presser foot lifting, gauge adjustment and thread trimming drive device according to claim 1, wherein: the other end of the needle pitch control pull rod (5) is connected with one end of a first tension spring (31), and the other end of the first tension spring (31) is connected to the bottom plate, so that the needle pitch adjusting roller (23) is always attached to the outer contour surface of the needle pitch control cam (4).

9. The sewing machine presser foot lifting, gauge adjustment and thread trimming drive device according to claim 1 or 8, wherein: one end of the needle pitch control pull rod (5) is connected with a needle pitch control shaft (26) through a needle pitch adjusting crank (25), the needle pitch control shaft (26) is connected with a swing seat (27) of the needle pitch adjusting mechanism, and the swing seat (27) is arranged on the bottom plate in a swinging mode through the needle pitch control shaft (26) and a feeding swing seat fixing pin (28).

10. The sewing machine presser foot lifting, gauge adjustment and thread trimming drive device according to claim 1, wherein: the trimming mechanism comprises a trimming crank driving shaft (33), a shifting lever (34) is arranged at one end of the trimming crank driving shaft (33), and the trimming roller (32) can be in contact with the shifting lever (34) to drive the shifting lever (34) to rotate so as to drive the trimming mechanism to execute trimming actions.

Images