CN117867767A

CN117867767A - A lift tooth and cut line module and modularization sewing machine for modularization sewing machine

Info

Publication number: CN117867767A
Application number: CN202211249100.9A
Authority: CN
Inventors: 祝书伟; 郑吉�; 柯祥林
Original assignee: Jack Technology Co Ltd
Current assignee: Jack Technology Co Ltd
Priority date: 2022-10-12
Filing date: 2022-10-12
Publication date: 2024-04-12

Abstract

The invention provides a thread lifting and cutting module for a modularized sewing machine and the modularized sewing machine, wherein the thread lifting and cutting module comprises a thread lifting and cutting driving source, a thread lifting and cutting unit, a thread cutting unit and a clutch unit, the thread lifting and cutting driving source is independent of other driving sources in the modularized sewing machine, the thread lifting and cutting driving source is connected with the thread lifting and cutting unit, and the clutch unit is connected between the output end of the thread lifting and cutting driving source and the thread cutting unit or between the thread lifting and cutting unit; the operating range of the thread lifting and cutting driving source comprises a thread lifting area and a thread cutting area which are mutually independent; when the thread-lifting cutting driving source runs in the thread-lifting area, the clutch unit is in a transmission chain separation state; when the thread lifting and cutting driving source runs in the thread cutting area, the clutch unit is in a transmission link connection state. According to the thread lifting and cutting device, the thread lifting function and the thread cutting function are integrated into the thread lifting and cutting module, the thread lifting function and the thread cutting function of the thread lifting and cutting module are switched through the clutch unit, and the fact that the thread lifting function and the thread cutting function are mutually noninterfere is guaranteed.

Description

A lift tooth and cut line module and modularization sewing machine for modularization sewing machine

Technical Field

The invention relates to the field of sewing machines, in particular to a modularized sewing machine and a thread lifting and cutting module for the modularized sewing machine.

Background

At present, each large sewing machine company has own design platform, and a feeding mechanism, a feed lifting mechanism, a thread trimming mechanism and a presser foot lifting mechanism are important functional mechanisms of the sewing machine, once the design platform of a certain company is determined, the research and development of products and next generation products are iterative update based on the design platform, and the research and development of another brand new design platform can be hardly performed.

At present, the sewing machine is an integrated machine, namely, a main motor is adopted to drive the needling cloth, the thread picking, the feeding and the thread hooking simultaneously, and the structure is very complex. For example, the conventional sewing machine shown in fig. 1 mainly includes a main motor, a spindle 100 driven to rotate by the main motor, a thorn cloth thread take-up mechanism 200, a feeding mechanism 300, a thread hooking mechanism 400, a thread cutting mechanism 500, and a presser foot lifting mechanism 600, wherein the thorn cloth thread take-up mechanism 200, the feeding mechanism 300, and the thread hooking mechanism 400 are all driven to rotate by the spindle 100, a thread cutting cam in the thread cutting mechanism 500 is driven to rotate by a lower shaft in the thread hooking mechanism 400, the thread cutting mechanism 500 has a thread cutting driving source 501 independent of the main motor, and the presser foot lifting mechanism 600 has a presser foot lifting driving source 601 independent of the main motor. When the sewing machine in the prior art runs, the main motor drives the main shaft 100 to rotate, and the main shaft 100 drives the thorn cloth thread picking mechanism 200, the feeding mechanism 300 and the thread hooking mechanism 400 to run, so that the thorn cloth thread picking mechanism 200, the feeding mechanism 300 and the thread hooking mechanism 400 cooperatively cooperate to finish sewing; when the thread needs to be cut, the thread cutting driving source 501 acts to enable a transmission component in the thread cutting mechanism 500 to be matched with the thread cutting cam, the main shaft 100 rotates to enable a lower shaft in the thread hooking mechanism 400 to rotate, and therefore the thread cutting mechanism 500 executes thread cutting action; when the presser foot is required to be lifted, the presser foot lifting drive source 601 is operated to cause the presser foot lifting mechanism 600 to perform the presser foot lifting operation.

The main structure of the feeding mechanism 300 is: the feeding mechanism comprises a feed lifting shaft and a feed conveying shaft which are parallel to the main shaft, a first feed lifting unit connected between the main shaft and the feed lifting shaft, a second feed lifting unit connected between the feed lifting shaft and the rear end of the feed rack, a first feed conveying unit connected between the main shaft and the feed conveying shaft, and a second feed conveying unit connected between the feed conveying shaft and the front end of the feed rack. The spindle drives the tooth frame and the cloth feeding tooth to do up-and-down reciprocating motion through the first tooth lifting unit, the tooth lifting shaft and the second tooth lifting unit so as to perform tooth lifting motion. The spindle drives the tooth frame and the feed teeth to do back-and-forth reciprocating motion through the first feed unit, the feed shaft and the second feed unit, and performs feed motion.

The main structure of the hooking mechanism 400 is: the thread hooking mechanism comprises a lower shaft parallel to the main shaft, a transmission shaft extending up and down, a bevel gear set connected between the main shaft and the upper end of the transmission shaft, a bevel gear set connected between the lower end of the transmission shaft and the right end of the lower shaft, and a rotating shuttle assembly fixed at the left end of the lower shaft.

The main structure of the thread cutting mechanism 500 is: the wire cutting mechanism comprises a wire cutting shaft parallel to the lower shaft, a wire cutting driving cam, a wire cutting clutch driving source, a movable cutter, a first wire cutting unit connected to the right end of the wire cutting shaft, and a second wire cutting unit connected between the left end of the wire cutting shaft and the movable cutter. When the wire is not cut, the wire cutting clutch driving source does not act, so that the first wire cutting unit is separated from the wire cutting driving cam; when cutting the wire, the wire cutting clutch driving source acts to enable the first wire cutting unit to be jointed with the wire cutting driving cam, and then the moving knife is driven to operate through rotation of the main shaft, so that the wire cutting is realized.

Therefore, as can be seen from the description of the above structure, the structure of the feeding mechanism (including the front and rear feeding mechanism, the up and down lifting tooth mechanism) and the thread cutting mechanism in the existing sewing machine is very complex, the number of parts is large, the transmission chain length is long, the clutch driving source is required to be additionally arranged to cooperate to realize the thread cutting action, the feeding mechanism and the thread cutting mechanism have single functions, and the thread feeding teeth can be lifted upwards from the needle plate during thread cutting, so that the length of the thread head remained on the cloth after thread cutting is unstable.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention is to provide a thread lifting and cutting module for a modular sewing machine, which integrates the thread lifting and cutting functions into a single module and can be integrally used for the modular sewing machine.

In order to achieve the above-mentioned purpose, the present invention provides a thread lifting and cutting module for a modularized sewing machine, comprising a thread lifting and cutting driving source, a thread lifting and cutting unit connected with a thread lifting and cutting connection part at one end of a frame, and a clutch unit, wherein the thread lifting and cutting driving source is independent of other driving sources in the modularized sewing machine, the output end of the thread lifting and cutting driving source is connected with the thread lifting and cutting unit, and the clutch unit is connected between the output end of the thread lifting and cutting driving source and the thread lifting and cutting unit or between the thread lifting and cutting unit and the thread cutting unit;

The operating range of the thread lifting and cutting driving source comprises a thread lifting area and a thread cutting area which are mutually independent; when the thread-lifting and cutting driving source runs in the thread-lifting area, the clutch unit is in a transmission chain separation state; when the thread lifting and cutting driving source runs in the thread cutting area, the clutch unit is in a transmission link connection state.

Further, the clutch unit includes a first clutch cam driven to rotate by the thread-lifting cutting driving source, a second clutch cam fixed on a cutting shaft in the thread-cutting unit, and a first clutch ball rotatably mounted on the first clutch cam and capable of contacting the second clutch cam, or the first clutch ball rotatably mounted on the second clutch cam and capable of contacting the first clutch cam, and the cutting shaft is rotatably supported in the base plate of the modular sewing machine.

Further, the clutch unit comprises a third clutch cam driven to rotate by the thread lifting and cutting driving source, a first clutch lever with a fixed rotation fulcrum, a second clutch ball rotatably mounted on the first clutch lever, a first clutch crank fixed on a thread cutting shaft in the thread cutting unit, a third clutch ball rotatably mounted on the first clutch crank, and a fourth clutch cam fixed on a lower shaft in the modularized sewing machine, wherein the second clutch ball can be abutted with the third clutch cam, and the third clutch ball can be abutted with the fourth clutch cam; the shearing shaft is rotatably and movably supported in the modularized sewing machine bottom plate, a pushing convex part is arranged on the first clutch crank, and the first clutch lever is abutted with the pushing convex part.

Further, the thread cutting unit further comprises a thread cutting slider rotatably mounted on the first clutch crank, a thread cutting crank shaft, a thread cutting crank, a thread cutting connecting rod, a movable cutter frame, a movable cutter fixed on the movable cutter frame and a fixed cutter fixed on a base plate of the modularized sewing machine, the thread cutting crank shaft comprises a transmission shaft part parallel to the thread cutting shaft and rotatably supported in the base plate of the modularized sewing machine, and a crank part integrally arranged at one end of the transmission shaft part, a thread cutting sliding groove in sliding fit with the thread cutting slider is formed in the crank part, the thread cutting crank is fixed at the other end of the transmission shaft part, and two ends of the thread cutting connecting rod are hinged with the thread cutting crank and the movable cutter frame respectively.

Further, the thread cutting unit further comprises a thread cutting slider rotatably mounted on the first clutch crank, a thread cutting crank shaft, a thread cutting fork crank, a thread cutting connecting rod, a main cutter frame, a driving cutter fixed on the main cutter frame, an auxiliary moving cutter and a thread cutting driving pin both fixed on the auxiliary cutter frame, the thread cutting crank shaft comprises a driving shaft part which is parallel to the thread cutting shaft and rotatably supported in a bottom plate of the modularized sewing machine, and a crank part integrally arranged at one end of the driving shaft part, the wire cutting device is characterized in that a wire cutting sliding groove which is in sliding fit with the wire cutting sliding block is formed in the crank part, the wire cutting fork opening crank is fixed at the other end of the transmission shaft part and is provided with a fork opening arm part, the wire cutting transmission pin is positioned in a fork opening of the fork opening arm part and is in sliding fit with the fork opening of the fork opening arm part, and two ends of the wire cutting connecting rod are respectively hinged with the wire cutting fork opening crank and the main cutter frame.

Further, the clutch unit comprises a second clutch crank driven to rotate by the thread lifting and cutting driving source, a fourth clutch ball rotatably mounted on the second clutch crank, a first clutch connecting rod and a transmission crank fixed on a thread cutting shaft in the thread cutting unit, wherein a free travel chute extending along the length direction of the first clutch connecting rod is formed in the first clutch connecting rod, the fourth clutch ball is located in the free travel chute of the first clutch connecting rod and is in sliding fit with the free travel chute of the first clutch connecting rod, the first clutch connecting rod is hinged with the transmission crank, and the thread cutting shaft is rotatably supported in a base plate of the modularized sewing machine.

Further, the feed lifting thread cutting driving source is a motor, the feed lifting unit comprises a feed lifting shaft rotatably supported in the bottom plate of the modularized sewing machine, a feed lifting eccentric crank fixed on the feed lifting shaft, a feed lifting connecting rod and a feed lifting pin, the feed lifting shaft is fixedly connected with a motor shaft of the feed lifting thread cutting driving source, one end of the feed lifting connecting rod is rotatably sleeved on an eccentric part of the feed lifting eccentric crank, and the other end of the feed lifting connecting rod is hinged with a feed lifting connecting part of the feed lifting frame through the feed lifting pin.

Further, the thread cutting unit further comprises a thread cutting crank fixed on the thread cutting shaft, a thread cutting connecting rod, a movable cutter frame, a movable cutter fixed on the movable cutter frame and a fixed cutter fixed on a bottom plate of the modularized sewing machine, and two ends of the thread cutting connecting rod are respectively hinged with the thread cutting crank and the movable cutter frame.

Further, the wire cutting unit further comprises a wire cutting fork opening crank, a wire cutting connecting rod, a main cutter frame, a driving cutter, an auxiliary cutter frame, an auxiliary moving cutter and a wire cutting transmission pin, wherein the wire cutting fork opening crank is fixed on the wire cutting shaft, the driving cutter is fixed on the main cutter frame, the auxiliary cutter frame is fixed on the auxiliary cutter frame, the wire cutting fork opening crank is provided with a fork opening arm part, the wire cutting transmission pin is positioned in a fork opening of the fork opening arm part and is in sliding fit with the fork opening of the fork opening arm part, and two ends of the wire cutting connecting rod are hinged with the wire cutting fork opening crank and the main cutter frame respectively.

Further, the thread cutting unit further comprises a thread cutting crank, a thread cutting main connecting rod, a main cutter frame, a driving cutter, an auxiliary thread cutting connecting rod, an auxiliary cutter frame and an auxiliary moving cutter, wherein the thread cutting crank is fixed on the thread cutting shaft, the driving cutter is fixed on the main cutter frame, the auxiliary cutter frame is fixed on the auxiliary cutter frame, a first thread cutting arm and a second thread cutting arm are circumferentially distributed in a staggered mode on the periphery of the thread cutting crank, two ends of the thread cutting main connecting rod are hinged to the first thread cutting arm and the main cutter frame respectively, and two ends of the auxiliary thread cutting connecting rod are hinged to the second thread cutting arm and the auxiliary cutter frame respectively.

Further, the clutch unit comprises a fifth clutch cam driven by the thread lifting and cutting driving source to rotate, a second clutch lever with a fixed rotation fulcrum, a fifth clutch ball rotatably arranged on the second clutch lever, and a second clutch connecting rod with one end hinged with the second clutch lever, wherein the other end of the second clutch connecting rod is in transmission connection with the thread cutting unit.

Further, the thread-lifting and cutting driving source is a motor, and the thread-lifting unit comprises a thread-lifting shaft rotatably supported in the bottom plate of the modularized sewing machine, a primary transmission component connected between a motor shaft of the thread-lifting and cutting driving source and the thread-lifting shaft, and a secondary transmission component connected between the thread-lifting shaft and a thread-lifting connection part of the frame; the primary transmission assembly comprises a lifting tooth eccentric wheel fixed on a motor shaft of the lifting tooth wire cutting driving source, a primary lifting tooth connecting rod and a primary lifting tooth crank fixed on the lifting tooth shaft, one end of the primary lifting tooth connecting rod is rotatably sleeved on an eccentric part of the lifting tooth eccentric wheel, and the other end of the primary lifting tooth connecting rod is hinged with the primary lifting tooth crank; the secondary transmission assembly comprises a secondary lifting tooth crank fixed on the lifting tooth shaft and a secondary lifting tooth connecting rod, and two ends of the secondary lifting tooth connecting rod are respectively hinged with the lifting tooth connecting parts of the secondary lifting tooth crank and the tooth frame.

Further, the wire cutting unit comprises a wire cutting fork opening crank with a fixed rotation fulcrum, a wire cutting connecting rod, a main cutter frame, a driving cutter fixed on the main cutter frame, an auxiliary moving cutter fixed on the auxiliary cutter frame and a wire cutting transmission pin, wherein the wire cutting fork opening crank is provided with a fork opening arm part, the second clutch connecting rod, the wire cutting fork opening crank fork opening arm part and the auxiliary cutter frame are coaxially hinged through the wire cutting transmission pin, the wire cutting transmission pin is positioned in a fork opening of the fork opening arm part and is in sliding fit with the fork opening of the fork opening arm part, and two ends of the wire cutting connecting rod are respectively hinged with the wire cutting fork opening crank and the main cutter frame.

Further, before the thread-lifting and cutting driving source runs to the end point of the thread-cutting area, the thread-lifting and cutting driving source enables the feed dog of the modularized sewing machine not to emerge from the needle plate through the thread-lifting unit.

The invention also provides a modularized sewing machine, wherein the modularized sewing machine is provided with the thread lifting and cutting module.

As described above, the thread cutting module for a modular sewing machine and the modular sewing machine according to the present invention have the following

The beneficial effects are that:

according to the thread lifting and trimming device, the thread lifting and trimming function and the thread trimming function are integrated into the thread lifting and trimming module, and independent thread lifting and trimming driving sources are adopted for independent driving, so that the thread lifting and trimming device is suitable for a modularized sewing machine, and the sewing adaptability is effectively improved; particularly, the clutch unit is used for switching the thread lifting function and the thread cutting function of the thread lifting and cutting module, so that the thread lifting function and the thread cutting function are ensured not to interfere with each other.

Drawings

Fig. 1 is a schematic view of a structure of a sewing machine in the prior art.

FIG. 2 is a schematic view of a first embodiment of a modular sewing machine according to the present application.

Fig. 3 is an exploded view of fig. 2.

Fig. 4 is a schematic view of the structure of the tooth lifting unit in fig. 2.

Fig. 5 is a schematic structural view of the clutch unit and the thread cutting unit in fig. 2.

Fig. 6a to 6d are schematic diagrams of different states of the clutch unit of the thread lifting and cutting module in fig. 2 in the thread cutting process.

Fig. 7 is a state diagram of the feed dog when the eccentric crank of the feed dog and the connecting rod of the feed dog are collinear in fig. 2.

Fig. 8a to 8c are schematic views of three embodiments of the operational angular distribution of the thread-lifting cutting drive source of fig. 2.

FIG. 9 is a schematic structural view of a second embodiment of the modular sewing machine of the present application.

Fig. 10 and 11 are schematic structural views of the thread-lifting and cutting module in fig. 9 at different viewing angles.

Fig. 12 is a schematic view of the third clutch cam of fig. 9.

Fig. 13 is a schematic structural view of a wire cutting unit of the single action knife structure of fig. 9.

Fig. 14 is a schematic structural view of a second embodiment of the double-acting knife structure of fig. 9.

Fig. 15 is a schematic view of the operational angular distribution of the lift wire drive source of fig. 9.

FIG. 16 is a view of the output angle of the drive source of the lift and shear wire of FIG. 9And (5) lifting the state diagram of the tooth unit.

Fig. 17 is a state diagram of the lifting unit when the lifting wire cutting driving source outputs an angle in the lifting region in fig. 9.

Fig. 18 is a state diagram of the lifting tooth unit when the lifting tooth wire cutting driving source outputs an angle in the wire cutting area in fig. 9.

FIG. 19 is a schematic view of a third embodiment of a modular sewing machine according to the present application.

Fig. 20 is a schematic view of the structure of the thread-lifting and cutting module in fig. 19.

Fig. 21 is a schematic structural view of a wire cutting unit of the single action knife structure of fig. 19.

Fig. 22 is a schematic structural view of a second embodiment of the double-acting knife unit of fig. 19.

Fig. 23 is a schematic view of the operational angular distribution of the lift wire drive source of fig. 19.

FIG. 24 is a view of the output angle of the drive source of the lift and shear wire of FIG. 19And (5) lifting the state diagram of the tooth unit.

Fig. 25 is a state diagram of the clutch unit when the feed lifting and thread cutting drive source in fig. 19 outputs an angle in the feed lifting region.

Fig. 26 is a state diagram of the lifting tooth unit when the lifting tooth shear driving source outputs an angle in the lifting tooth area in fig. 19.

Fig. 27 is a state diagram of the clutch unit when the feed lifting and thread cutting driving source in fig. 19 outputs an angle in the thread cutting region.

Fig. 28 is a state diagram of the lifting tooth unit when the lifting tooth wire cutting driving source outputs an angle in the wire cutting area in fig. 19.

Fig. 29 is a schematic view of a fourth embodiment of the modular sewing machine of the present application.

Fig. 30 is a schematic view of the structure of the tooth lifting unit in fig. 29.

Fig. 31 is a schematic view of the clutch unit and the thread cutting unit of fig. 29.

Fig. 32 is a schematic view of the clutch cam and the lifter eccentric of fig. 29.

Fig. 33a and 33b are schematic views of the thread-lifting and cutting module of fig. 29 in a normal sewing state.

Fig. 34 is a schematic view of the thread-lifting and cutting module in fig. 29 in a thread cutting state.

FIG. 35 is a view of the output angle of the drive source of the lift and shear wire of FIG. 29And a state diagram of a first-stage transmission component in the lifting tooth unit.

Fig. 36a to 36c are schematic views showing three embodiments of the operational angular distribution of the thread-lifting and cutting drive source of fig. 29.

Fig. 37 is a schematic view of the feeding module of fig. 2, 9, 19 and 29.

Description of element reference numerals

10. Thread-lifting and cutting driving source

20. Tooth rack

21. Lifting tooth connecting part

22. Feeding connecting part

30. Lifting tooth unit

31. Lifting shaft

32. Eccentric crank for lifting tooth

33. Lifting tooth connecting rod

34. Lifting tooth pin

35. Lifting tooth eccentric wheel

36. Primary lifting tooth connecting rod

37. Primary lifting crank

38. Two-stage lifting crank

39. Two-stage tooth lifting connecting rod

40. Thread cutting unit

41. Shearing shaft

42. Wire cutting slide block

43. Wire cutting crank axle

431. Wire cutting chute

44. Wire cutting crank

45. Wire cutting connecting rod

46. Movable knife rest

47. Movable knife

48. Fixed knife

49. Wire cutting fork opening crank

410. Main knife rest

411. Active knife

412. Auxiliary tool rest

413. Auxiliary moving knife

414. Wire cutting driving pin

415. Wire cutting main connecting rod

416. Auxiliary connecting rod for trimming

417. Reset torsion spring

418. Forced reset pin

419. Reset spring

420. Forced reset ball

421. Forced reset cam

50. Clutch unit

51. First clutch cam

511. Forced reset arm

52. Second clutch cam

53. First clutch ball

54. Third clutch cam

541. Base circle segment

542. Variable pitch surface segment

55. First clutch lever

56. Second clutch ball

57. First clutch crank

571. Push convex part

58. Third clutch ball

59. Fourth clutch cam

510. Second clutch crank

511. Fourth clutch ball

512. First clutch connecting rod

5121. Idle stroke chute

513. Transmission crank

514. Fifth clutch cam

5141. Forced reset convex part

515. Second clutch lever

516. Fifth clutch ball

517. Second clutch connecting rod

60. Feeding module

61. Feeding driving source

62. Feeding crank

63. Feeding connecting rod

64. Feeding shaft

65. Dental frame base

70. Feed dog

80. Thread hooking module

81. Wire hooking driving source

82. Lower shaft

90. Stop block

110. Tension spring

120. Stop pin

130. Limiting block

Detailed Description

Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or adjustments of the sizes, which are otherwise, used in the practice of the invention, are included in the spirit and scope of the invention which is otherwise, without departing from the spirit or scope thereof. Also, the terms such as "upper", "lower", "left", "right", "middle", etc. are used herein for convenience of description, but are not to be construed as limiting the scope of the invention, and the relative changes or modifications are not to be construed as essential to the scope of the invention.

The invention provides a modularized sewing machine, in particular to a thread lifting and cutting module for the modularized sewing machine. For convenience of description, in the following embodiments, a length direction of the modular sewing machine is defined as a left-right direction, a width direction of the modular sewing machine is defined as a front-rear direction, and a height direction of the modular sewing machine is defined as an up-down direction; meanwhile, the left direction is the direction facing the head of the modularized sewing machine, the right direction is the direction facing the tail of the modularized sewing machine, and the front direction is the moving direction of the cloth during normal sewing of the modularized sewing machine.

As shown in fig. 2, 9, 19, or 29, the modular sewing machine according to the present invention is provided with a thread lifting and cutting module, a feeding module 60, a needling module, a thread take-up module, a thread hooking module 80, a thread bracket 20, and a feed dog 70 fixedly mounted on the thread bracket 20. Wherein the needling module and the thread take-up module are not shown in the figures; as shown in fig. 19, the thread hooking module 80 includes a thread hooking driving source 81, a lower shaft 82 rotatably supported in a base plate of the modular sewing machine, and a rotating shuttle assembly fixed to a left end of the lower shaft 82, the thread hooking driving source 81 being a motor, a right end of the lower shaft 82 being coupled to a motor shaft of the thread hooking driving source 81 through a coupling; the rear end and the front end of the tooth frame 20 are respectively provided with a lifting tooth connecting part 21 and a feeding connecting part 22, the lifting tooth connecting part 21 at the rear end of the tooth frame 20 is connected with the output end of the lifting tooth unit 30 in the lifting tooth thread cutting module, and the feeding connecting part 22 at the front end of the tooth frame 20 is connected with the output end of the feeding module 60. The thread lifting and cutting module, the feeding module 60, the needling module, the thread picking module and the thread hooking module 80 are functional modules of the modularized sewing machine, and the needling module and the thread picking module can be combined into one needling and thread picking module or can be two independent functional modules. In the modularized sewing machine, each functional module is driven by an independent driving source, so that the functional modules of the modularized sewing machine are mutually independent and do not interfere with each other, on one hand, the transmission chain of each functional module is shortened, the problems of vibration, noise and the like caused by overlong transmission chain are avoided, on the other hand, the relative motion time sequence and motion law of each functional module can be adjusted, for example, the early and late time of the thread hooking moment of a rotating shuttle relative to a needle in a fabric needling module in the thread hooking module 80 can be adjusted, the motion track of a fabric feeding tooth 70 is adjusted and the like, and therefore the sewing adaptability is greatly improved. In addition, the modularized sewing machine has strong automation and intelligent functions, low cost, good user experience and wide application range, and greatly improves the comprehensive competitiveness of the product

As shown in fig. 2 or 9 or 19 or 29, the thread-lifting and cutting module according to the present application includes a thread-lifting and cutting driving source 10, a thread-lifting and cutting unit 30, a thread-cutting unit 40 and a clutch unit 50, where the thread-lifting and cutting driving source 10 is independent of other driving sources in the modularized sewing machine, an output end of the thread-lifting and cutting driving source 10 is connected with the thread-lifting and cutting unit 30, an output end of the thread-lifting and cutting unit 30 is connected with a thread-lifting and cutting connecting portion 21 at a rear end of the frame 20, and the clutch unit 50 is connected between an output end of the thread-lifting and cutting driving source 10 and the thread-cutting unit 40, or between the thread-lifting and cutting unit 30 and the thread-cutting unit 40. The thread-lifting and cutting driving source 10 is a motor, such as a stepping motor and a servo motor; the operating range of the thread-lifting/cutting drive source 10 includes a thread-lifting region X1 and a thread-cutting region X2 which are independent of each other, and the end point of the thread-lifting region X1 and the start point of the thread-cutting region X2 may be overlapped or not overlapped. In particular, when the modular sewing machine performs sewing operation, the thread-lifting and cutting driving source 10 swings back and forth within a certain angle range in the thread-lifting region X1, and the angle range corresponds to the set thread-lifting height of the modular sewing machine; in this process, the feed block 30 drives the frame 20 and the feed block 70 to reciprocate up and down to perform the feed block, and the feed block 60 drives the frame 20 and the feed block 70 to reciprocate back and forth to perform the feed block, but the clutch unit 50 is in a transmission chain separated state, so that the output torque of the feed block cutting drive source 10 is not transmitted to the cutting unit 40, and the cutting unit 40 does not act. When the modularized sewing machine needs to cut threads, the thread lifting and cutting driving source 10 rotates from the thread lifting and cutting area X1 to the thread cutting area X2 along the positive direction, and in the process that the thread lifting and cutting driving source 10 rotates from the starting point of the thread cutting area X2 to the end point of the thread cutting area X2, the clutch unit 50 is in a transmission chain connection state, so that the output torque of the thread lifting and cutting driving source 10 is transmitted to the thread cutting unit 40 through the clutch unit 50 or through a part in the thread lifting and cutting unit 30 and the clutch unit 50, and the thread cutting unit 40 is driven to execute thread cutting action, and automatic thread cutting is realized.

Thus, the lift-and-shear module and the feed module 60 in this application collectively comprise the "feed-lift-and-shear mechanism" of the modular sewing machine. The lifting tooth thread cutting module integrates the lifting tooth function and the thread cutting function of the modularized sewing machine, the clutch unit 50 is used for switching the lifting tooth function and the thread cutting function of the lifting tooth thread cutting module, the lifting tooth function and the thread cutting function are ensured not to interfere with each other, the independent lifting tooth thread cutting driving source 10 is adopted for independent driving, the modularized sewing machine is suitable for the modularized sewing machine, and the sewing adaptability can be effectively improved: the height of the lifting teeth of the transmission cloth teeth 70 is changed by changing the amplitude of the swing of the lifting tooth wire cutting driving source 10; the actual needle pitch is changed by changing the amplitude of the swing of the feeding driving source 61 in the feeding module 60; the change of the motion trail of the feed dog 70 is realized by controlling the time matching relation of the feed driving source 61 and the feed lifting thread cutting driving source 10 in the feed module 60, for example, an elliptical motion trail, a regular triangle motion trail, an inverse triangle motion trail and a rectangular motion trail can be realized.

Further, in the thread-lifting and cutting module, the thread-lifting and cutting unit 30, the thread-cutting unit 40 and the clutch unit 50 have various preferred structures, so that the thread-lifting and cutting module has various preferred embodiments, that is, the modular sewing machine has various preferred embodiments accordingly. One preferred embodiment of the feeder module 60, and four preferred embodiments of the lift wire module are provided below.

Feeding module 60

As shown in fig. 37, the feeding module 60 includes a feeding driving source 61 and a feeding unit connected to the feeding connection portion 22 at the front end of the dental floss holder 20, the feed driving source 10 and the feeding driving source 61 are two independent driving sources, and the feeding driving source 61 is also a motor. The feeding unit includes a feeding crank 62 driven to rotate by a feeding driving source 61, a feeding link 63, and a frame mount 65 rotatably supported in a base plate of the modular sewing machine by a feeding shaft 64, both ends of the feeding link 63 are hinged with the feeding crank 62 and the frame mount 65, respectively, and the frame mount 65 is hinged with the feeding connection 22 of the frame 20. When the modular sewing machine performs a sewing operation, the feeding driving source 61 swings back and forth within a certain angle range, and the feeding crank 62 and the feeding connecting rod 63 drive the frame base 65 to swing back and forth, so as to drive the feeding connecting part 22 of the frame 20 and the feed dog 70 to reciprocate back and forth, and drive the feed dog 70 to perform a back and forth feed operation.

Embodiment of the thread-lifting and cutting module

As shown in fig. 3, the clutch unit 50 includes a first clutch cam 51 driven to rotate by the thread-lifting and cutting driving source 10, a second clutch cam 52 fixed to the cutting shaft 41 of the thread cutting unit 40, and a first clutch ball 53, the cutting shaft 41 being rotatably supported in the modular sewing machine bed, the first clutch ball 53 being rotatably mounted on the first clutch cam 51 and capable of contacting the second clutch cam 52, or the first clutch ball 53 being rotatably mounted on the second clutch cam 52 and capable of contacting the first clutch cam 51. In the embodiment shown in fig. 3, the first clutch ball 53 is rotatably mounted on the first clutch cam 51, and the following embodiments are explained taking this structure as an example.

As shown in fig. 8a, 8b or 8c, the start point and the end point of the lifting tooth region X1 of the lifting tooth wire cutting drive source 10 are respectively anglesAnd->The start point and the end point of the thread cutting region X2 of the thread lifting and cutting driving source 10 are respectively at an angle +.>And-> When the modularized sewing machine is used for sewing, when the thread lifting and cutting driving source 10 swings back and forth within a certain angle range in the thread lifting region X1, no power is transmitted between the first clutch ball 53 and the second clutch cam 52, no power is transmitted between the first clutch cam 51 and the thread cutting shaft 41, the thread cutting shaft 41 does not rotate, and the thread cutting unit 40 does not act. When the modularized sewing machine needs to cut the thread, the thread lifting and cutting driving source 10 rotates from the thread lifting and cutting area X1 to the thread cutting area X2 along the positive direction, namely anticlockwise direction in the figure 8a, the figure 8b or the figure 8c, and the thread lifting and cutting driving source 10 is at the beginning of the thread cutting area X2>Forward rotation to the end point of the trimming zone X2 +.>In the process, power is transmitted between the first clutch ball 53 and the second clutch cam 52, so that power is transmitted between the first clutch cam 51 and the thread cutting shaft 41, the first clutch cam 51 drives the second clutch cam 52 to rotate through the first clutch ball 53, the thread cutting shaft 41 synchronously rotates along with the second clutch cam 52, and the thread cutting unit 40 is driven to execute thread cutting action, so that automatic thread cutting is realized. Thus, the clutch unit 50 can be understood as the wire cutting transmission part of the wire cutting lifting and cutting module; the thread cutting unit 40 may be understood as a thread cutting executing part of the thread lifting and cutting module.

In the present embodiment, as shown in fig. 6a and 6b, the outer peripheral surface of the second clutch cam 52 is provided with a diameter-changing section; when the thread cutting drive source 10 is operated in the thread cutting region X1, the first clutch ball 53 is not contacted with the second clutch cam 52, and the first clutch ball 53 and the second clutch cam 52 are separated, so that no power is transmitted between the first clutch ball 53 and the second clutch cam 52; when the thread cutting drive source 10 is operated in the thread cutting region X2, the first clutch ball 53 contacts with the variable diameter section of the second clutch cam 52, so that power is transferred between the first clutch ball 53 and the second clutch cam 52, and the first clutch cam 51 can drive the second clutch cam 52 and the thread cutting shaft 41 to rotate through the first clutch ball 53. Of course, in other embodiments, an isodiametric segment may be provided on the outer peripheral surface of the second clutch cam 52; when the thread cutting feed lifting drive source 10 is operated in the thread lifting region X1, the first clutch ball 53 is in contact with the constant diameter section of the second clutch cam 52, and no power is transmitted between the first clutch ball 53 and the second clutch cam 52.

As shown in fig. 2 and 3, the lifting unit 30 has a lifting shaft 31 parallel to the thread cutting shaft 41, the lifting shaft 31 is rotatably supported in the base plate of the modular sewing machine, the motor shaft of the lifting thread cutting driving source 10 is connected with the right end of the lifting shaft 31 through a coupling, and the lifting thread cutting driving source 10 directly drives the lifting shaft 31 to rotate. The first clutch cam 51 is fixed on a motor shaft of the thread-lifting and cutting driving source 10 through a screw, and the thread-lifting and cutting driving source 10 directly drives the first clutch cam 51 to rotate; alternatively, the first clutch cam 51 is fixed to the lifter shaft 31 by a screw, and the lifter wire cutting drive source 10 drives the first clutch cam 51 to rotate by the lifter shaft 31.

As shown in fig. 4, the lifter unit 30 further includes a lifter eccentric crank 32 fixed to the left end of the lifter shaft 31, a lifter link 33, and a lifter pin 34, one end of the lifter link 33 is rotatably fitted over the eccentric portion of the lifter eccentric crank 32 through a bearing, and the other end of the lifter link 33 is hinged to the lifter link 21 of the frame 20 through the lifter pin 34. When the thread cutting drive source 10 drives the feed dog shaft 31 and the feed dog eccentric crank 32 to swing back and forth within a certain angle range in the feed dog region X1, the feed dog 70 is driven to perform the up-and-down feed dog action by the feed dog connecting portion 21 of the feed dog 20 being driven to reciprocate up and down by the feed dog connecting rod 33.

Further, when the thread cutting drive source 10 is operated to the end point of the thread cutting region X2Front (comprising lifting the feed line cutting drive source 10 to the end point of the cutting zone X2 +.>When the thread cutting drive source 10 is lifted, the thread feeding teeth 70 of the modularized sewing machine are not ejected from the needle plate through the thread lifting unit 30, namely, the thread feeding teeth 70 sink to the lower part of the needle plate, lower feeding during thread cutting is realized, the thread feeding teeth 70 cannot lift the cloth upwards, the distance between the cloth and the thread cutting nip point in the thread cutting unit 40 can be shortened, the length of thread ends remained on the cloth after thread cutting can be shortened, and the thread cutting effect of the short thread ends can be stably realized. Accordingly, the lifting unit 30 causes the feed dog 70 to sink from the needle plate, and the sinking operation occurs in the thread cutting area X2.

Further, the thread-lifting and cutting driving source 10 outputs an angleWhen the modularized sewing machine has the minimum effective lifting height; the output angle of the thread-lifting and cutting driving source 10 is +.>When the modularized sewing machine is in use, the modularized sewing machine has the maximum effective lifting height; the thread-lifting cutting drive source 10 starts from the starting point of the thread-lifting region X1>Rotate in the positive direction to the end point of the tooth lifting zone X1 +.>In the process of the process, the effective lifting tooth height of the sewing machine is gradually increased. In addition, in the thread-lifting cutting drive source 10, the thread-lifting region X1 rotates in the positive direction to the end point of the thread-cutting region X2>During this process of (1), the thread-lifting and cutting drive source 10 outputs an angleDegree->At this time, as shown in fig. 7, the eccentric crank 32 of the lifter and the link 33 of the lifter are collinear, that is, the center of the lifter shaft 31, the center of the eccentric portion of the eccentric crank 32 of the lifter, and the center of the lifter pin 34 (that is, the hinge center of the link 33 of the lifter and the lifter link 21 of the frame 20) are collinear, and at this time, the feed dog 70 is at the limit position, and the distance from the needle plate to the upper side is the largest. In particular, the angle of the thread-lifting cutting drive source 10 +.>It is necessary to be smaller than the end point of the trimming area X2 +.>Ensuring the lower supply of thread cutting, the angle of the thread-lifting and cutting driving source 10 is +.>There may be several cases: 1. as shown in fig. 8 a- >2. As shown in fig. 8 b-> 3. As shown in FIG. 8c, < >>Thus, the height of the feed dog 70 is changed during the thread cutting process as follows: firstly, gradually increasing the height of the effective lifting teeth from the current height to be corresponding to +.>The maximum effective height of the angle is gradually increased to correspond to +.>The maximum tooth height of the angle is then gradually reduced to a corresponding +.>Negative values of the angle raise the height of the teeth, which corresponds to feed dog 70 being below the needle plate.

The thread cutting unit 40 can adopt a single-acting cutter structure or a double-acting cutter structure; in this embodiment, the thread cutting unit 40 adopts a double-acting knife structure. As shown in fig. 5, the thread cutting unit 40 further includes a thread cutting crank 44 fixed to the left end of the thread cutting shaft 41, a thread cutting main link 415, a main cutter holder 410, a driving cutter 411 fixed to the main cutter holder 410, a thread cutting auxiliary link 416, an auxiliary cutter holder 412, and an auxiliary moving cutter 413 fixed to the auxiliary cutter holder 412, wherein a first thread cutting arm 441 and a second thread cutting arm 442 distributed in a circumferentially offset manner are provided on the outer circumference of the thread cutting crank 44, and both ends of the thread cutting main link 415 are respectively hinged to the first thread cutting arm 441 and the main cutter holder 410 by pins, and both ends of the thread cutting auxiliary link 416 are respectively hinged to the second thread cutting arm 442 and the auxiliary cutter holder 412 by pins. From the start point of the thread cutting region X2, the thread cutting driving source 10 is lifted Forward rotation to the end point of the trimming zone X2 +.>In the process of the thread cutting module 80, the thread cutting shaft 41 drives the thread cutting crank 44 to rotate, and the thread cutting crank 44 drives the main knife rest 410 and the auxiliary knife rest 412 to rotate around the lower shaft 82 in the thread hooking module 80 in opposite directions through the thread cutting main connecting rod 415 and the thread cutting auxiliary connecting rod 416 respectively, so that the driving knife 411 and the auxiliary moving knife 413 rotate in opposite directions until the driving knife 411 and the auxiliary moving knife bite to cut a thread.

Preferably, as shown in fig. 5, the thread cutting unit 40 further has a reset torsion spring 417 which is sleeved on the outer circumference of the thread cutting shaft 41, and a stopper 90 which is fixed to the modular sewing machine base plate, both ends of the reset torsion spring 417 are respectively connected to the thread cutting crank 44 and the modular sewing machine base plate. After the thread cutting is finished, the thread cutting driving source 10 is lifted from the end point of the thread cutting area X2Reverse to the start of the trimming X2>In this process, the spring force of the return spring 419 drives the wire cutting crank 44 to rotate reversely, and the wire cutting crank 44 drives the main knife rest 410 and the auxiliary knife rest 412 to rotate reversely around the lower shaft 82 in the hooking module 80 through the wire cutting main link 415 and the wire cutting auxiliary link 416, respectively, so that the driving knife 411 and the auxiliary moving knife 413 rotate reversely, and are reset respectively, until the wire cutting crank 44 is limited at its initial position by the stopper 90.

Further, as shown in fig. 6a to 6d, a forced return arm 511 is provided on the outer periphery of the first clutch cam 51, and a forced return pin 418 is fixed to the second clutch cam 52; during the thread cutting process, as shown in fig. 6a and 6b, the first clutch ball 53 is in contact with the variable diameter section of the second clutch cam 52; in the resetting process of the thread cutting unit 40 after the thread cutting is finished, the thread lifting and cutting driving source 10 reversely rotates, on one hand, the reset is driven by the reset torsion spring 417, on the other hand, the forced reset arm 511 rotates towards the direction close to the forced reset pin 418, as shown in fig. 6c and 6d, after the forced reset arm 511 is abutted against the forced reset pin 418, the first clutch cam 51 drives the second clutch cam 52 reversely rotate to forcibly reset, and the fault that the driving knife 411 and the auxiliary moving knife 413 cannot be smoothly reset due to the fact that the thread is clamped is avoided.

Second embodiment of thread-lifting and cutting module

As shown in fig. 10 and 11, the clutch unit 50 includes a third clutch cam 54 driven to rotate by the thread-lifting and cutting driving source 10, a first clutch lever 55 having a fixed rotation fulcrum, a second clutch ball 56 rotatably mounted at one end of the first clutch lever 55, a first clutch crank 57 fixed on the thread cutting shaft 41 in the thread cutting unit 40, a third clutch ball 58 rotatably mounted on the first clutch crank 57, and a fourth clutch cam 59 fixed on the lower shaft 82 of the modular sewing machine, the first clutch lever 55 is hinged to the modular sewing machine base plate by a pin extending up and down, the thread cutting shaft 41 is rotatably and movably supported in the modular sewing machine base plate, a convex pushing boss 571 is integrally provided on the outer circumferential surface of the first clutch crank 57, and the other end of the first clutch lever 55 is abutted against the pushing boss 571.

As shown in fig. 15, the start point and the end point of the feed lifting region X1 of the feed lifting and cutting drive source 10 are respectively anglesAnd->The start point and the end point of the thread cutting region X2 of the thread lifting and cutting driving source 10 are respectively at an angle +.>And->In this embodiment, <' > a-> I.e. the end point of the lifting tooth region X1 coincides with the start point of the trimming region X2. When the modularized sewing machine performs sewing operation, the thread lifting and cutting driving source 10 swings back and forth within a certain angle range in the thread lifting region X1, no power is transmitted between the third clutch cam 54 and the second clutch ball 56, the first clutch lever 55 does not rotate, the first clutch lever 55 does not push the first clutch crank 57 and the thread cutting shaft 41, the third clutch ball 58 on the first clutch crank 57 is far away from the fourth clutch cam 59 on the lower shaft 82, no contact and no power transmission are performed between the third clutch ball 58 and the fourth clutch cam 59, and therefore, the lower shaft 82 does not drive the first clutch crank 57 and the thread cutting shaft 41 to rotate, and the thread cutting unit 40 does not act. When the modularized sewing machine needs to cut the thread, the thread lifting and cutting driving source 10 rotates from the thread lifting area X1 to the thread cutting area X2 along the positive direction, namely the clockwise direction in the view of fig. 15; in the lifting-tooth thread cutting driving source 10, from the starting point of the thread cutting region X2 +. >Forward rotation to the end point of the trimming zone X2 +.>In the process of (a), the third clutch cam 54 and the second clutch camThe clutch balls 56 are in power transmission, the third clutch cam 54 pushes the first clutch lever 55 to rotate through the second clutch ball 56, the first clutch lever 55 pushes the first clutch crank 57 and the shear spool 41 to move leftwards, the third clutch ball 58 on the first clutch crank 57 is close to the fourth clutch cam 59, and then the third clutch ball 58 is positioned on the outer periphery side of the fourth clutch cam 59; in this way, the lower shaft 82 rotates, the fourth clutch cam 59 rotates along with the lower shaft 82, the fourth clutch cam 59 pushes the first clutch crank 57 to rotate through the third clutch ball 58, the thread cutting shaft 41 rotates along with the first clutch crank 57, and the thread cutting unit 40 is driven to perform thread cutting action, so that automatic thread cutting is realized.

Further, as shown in fig. 12, the third clutch cam 54 is an end cam, that is, a side end surface of the third clutch cam 54 is a cam surface having a base circle surface section 541 and a variable-pitch surface section 542. When the thread cutting drive source 10 is operated in the thread lifting region X1, the second clutch ball 56 is in contact with the base circular surface section 541, so that no power is transmitted between the second clutch ball 56 and the third clutch cam 54, and the third clutch cam 54 does not transmit torque to the first clutch lever 55. When the lift pin wire cutting drive source 10 is operating within the cutting zone X2, the second clutch ball 56 contacts the variable-pitch surface section 542 such that there is a power transfer between the second clutch ball 56 and the third clutch cam 54, and the third clutch cam 54 transfers torque to the first clutch lever 55 via the second clutch ball 56. Preferably, as shown in fig. 10 and 11, the thread-lifting and cutting module further includes a tension spring 110 with a right end fixed on the bottom plate of the modular sewing machine, wherein a left end of the tension spring 110 is connected with the first clutch lever 55, and a connection point of the tension spring 110 and the first clutch lever 55 is distributed on one side of a fixed rotation pivot of the first clutch lever 55, which is opposite to the second clutch ball 56; in this way, the force applied by the tension spring 110 to the first clutch lever 55 can make the second clutch ball 56 cling to the cam surface of the third clutch cam 54, so as to ensure the accuracy of thread cutting and subsequent resetting. In other embodiments, when the thread cutting drive source 10 is operated in the thread lifting region X1, the second clutch ball 56 is not in contact with the third clutch cam 54, and no power is transmitted between the second clutch ball 56 and the third clutch cam 54.

Further, as shown in fig. 11, the fourth clutch cam 59 is a cylindrical cam, that is, the outer peripheral surface of the fourth clutch cam 59 has a diameter-variable section. When the thread cutting drive source 10 is operated in the thread lifting region X1, the third clutch ball 58 is away from the fourth clutch cam 59 and is not in contact with the fourth clutch cam 59, so that no power is transmitted between the third clutch ball 58 and the fourth clutch cam 59. When the thread cutting drive source 10 is operated in the thread cutting region X2, the third clutch ball 58 is located on the outer peripheral side of the fourth clutch cam 59, and as the lower shaft 82 drives the fourth clutch cam 59 to rotate, the third clutch ball 58 can contact with the variable diameter section of the fourth clutch cam 59, so that power is transferred between the third clutch ball 58 and the fourth clutch cam 59.

Further, as shown in fig. 10 and 11, the lift pin unit 30 has therein a lift pin shaft 31 parallel to the shear pin shaft 41 and rotatably supported in the bottom plate of the modular sewing machine, the motor shaft of the lift pin shear driving source 10 is coupled to the right end of the lift pin shaft 31 through a coupling, and the lift pin shear driving source 10 directly drives the lift pin shaft 31 to rotate. The third clutch cam 54 is fixed on the motor shaft of the thread-lifting and cutting driving source 10 through a screw, and the thread-lifting and cutting driving source 10 directly drives the third clutch cam 54 to rotate; alternatively, the third clutch cam 54 is fixed to the lifter shaft 31 by a screw, and the lifter wire cutting driving source 10 drives the third clutch cam 54 to rotate by the lifter shaft 31.

As shown in fig. 10 and 11, the lifter unit 30 further includes a lifter eccentric crank 32 fixed to the left end of the lifter shaft 31, a lifter link 33, and a lifter pin 34, one end of the lifter link 33 is rotatably fitted over the eccentric portion of the lifter eccentric crank 32 through a bearing, and the other end of the lifter link 33 is hinged to the lifter link 21 of the bracket 20 through the lifter pin 34. When the thread cutting drive source 10 drives the feed dog shaft 31 and the feed dog eccentric crank 32 to swing back and forth within a certain angle range in the feed dog region X1, the feed dog 70 is driven to perform the up-and-down feed dog action by the feed dog connecting portion 21 of the feed dog 20 being driven to reciprocate up and down by the feed dog connecting rod 33.

Further, in the present application, the feed lifting and thread cutting drive source 10 outputs an angleWhen the modular sewing machine has a minimum effective lifting height. The output angle of the thread-lifting and cutting driving source 10 is +.>And->When the cam crank 32 is in line with the cam link 33, i.e., the center of the cam shaft 31, the center of the cam crank 32, and the center of the cam pin 34 (i.e., the hinge center of the cam link 33 and the cam link 21 of the frame 20) are in line with each other, the feed dog 70 is at the limit position, the distance of the feed dog 70 from the needle plate is the largest, and the modular sewing machine has the largest effective cam height, as shown in fig. 16. In particular, the thread-lifting cutting drive source 10 outputs an angle +. >When the modularized sewing machine has a negative lifting height, the negative lifting height corresponds to the negative lifting height of the feed dog 70 below the needle plate, namely, the negative lifting height corresponds to the negative lifting height before the moment or the moment, the lifting thread cutting driving source 10 enables the feed dog 70 of the modularized sewing machine not to emerge from the needle plate through the lifting dog unit 30, the feed dog 70 is enabled to sink to the lower side of the needle plate, lower feeding during thread cutting is achieved, the feed dog 70 can not lift the cloth upwards, the distance between the cloth and a thread cutting nip point in the thread cutting unit 40 can be shortened, the length of a thread head remained on the cloth after thread cutting can be shortened, and the thread cutting effect of a short thread head can be stably achieved. Therefore, the thread-lifting cutting drive source 10 starts from the starting point of the thread-lifting region X1 +.>Rotate in the positive direction to the end point of the tooth lifting zone X1 +.>In the process of (1), the lifting height of the feed dog 70 is gradually increased; when the thread cutting feed lifting drive source 10 is operated in the thread lifting region X1, the posture of the eccentric crank 32 and the thread lifting link 33 are as shown in fig. 17. The thread-lifting cutting driving source 10 starts from the starting point of the thread cutting region X2>Rotate in the positive direction to the end point of the trimming area X2 +.>In the process of (1), the lifting height of the feed dog 70 is gradually reduced; when the thread-lifting drive source 10 is operated in the thread cutting region X2, the posture of the eccentric crank 32 and the link 33 are as shown in fig. 18.

Further, the wire cutting unit 40 may have a single-action knife structure or a double-action knife structure, so that the wire cutting unit 40 has the following two embodiments.

As shown in fig. 9, 10 and 13, the thread cutting unit 40 of the single-action knife structure includes a thread cutting slider 42 rotatably mounted on a first clutch crank 57, a thread cutting crank shaft 43, a thread cutting crank 44, a thread cutting link 45, a movable knife holder 46, a movable knife 47 fixed on the movable knife holder 46, and a fixed knife 48 fixed on a base plate of the modular sewing machine, the thread cutting crank shaft 43 includes a transmission shaft portion rotatably supported in the base plate of the modular sewing machine in parallel to the thread cutting shaft 41, and a crank portion integrally provided on a right end of the transmission shaft portion, a thread cutting slide groove 431 slidably engaged with the thread cutting slider 42 is provided in the crank portion, the thread cutting slide groove 431 is penetrated left and right, the thread cutting crank 44 is fixed on a left end of the transmission shaft portion, and both ends of the thread cutting link 45 are hinged with the thread cutting crank 44 and the movable knife holder 46, respectively.

In the second embodiment of the thread cutting unit 40, as shown in fig. 9, 10 and 14, the thread cutting unit 40 of the double-acting knife structure comprises a thread cutting slider 42 rotatably mounted on a first clutch crank 57, a thread cutting crank shaft 43, a thread cutting fork crank 49, a thread cutting link 45, a main knife rest 410, a driving knife 411 fixed on the main knife rest 410, an auxiliary knife rest 412, an auxiliary moving knife 413 and a thread cutting driving pin 414 both fixed on the auxiliary knife rest 412, the thread cutting crank shaft 43 comprises a driving shaft part parallel to the thread cutting shaft 41 and rotatably supported in a base plate of the modularized sewing machine, and a crank part integrally provided at the right end of the driving shaft part, a thread cutting sliding groove 431 in sliding fit with the thread cutting slider 42 is formed in the crank part, the thread cutting sliding groove 431 penetrates left and right, the thread cutting fork crank 49 is fixed at the left end of the driving shaft part, the thread cutting fork crank 49 has a fork arm, the thread cutting driving pin 414 is positioned in the fork of the fork arm, both sides of the fork arm are in sliding fit, and both ends of the thread cutting link 45 are respectively hinged with the thread cutting fork crank 49 and the main knife rest 410.

In the embodiment of the thread cutting unit 40, the thread cutting slide groove 431 at the right end of the thread cutting crank shaft 43 and the thread cutting slide block 42 form a sliding pair. Preferably, the wire cutting unit 40 further includes a return torsion spring 417 sleeved on the outer circumference of the left section portion of the wire cutting crank shaft 43, and a return spring 419 sleeved on the wire cutting shaft 41; in the first embodiment of the thread cutting unit 40, two ends of the reset torsion spring 417 are respectively connected with the thread cutting crank 44 and the modularized sewing machine bottom plate, and in the second embodiment of the thread cutting unit 40, two ends of the reset torsion spring 417 are respectively connected with the thread cutting fork crank 49 and the modularized sewing machine bottom plate; the left end of the return spring 419 is fixed, and the right end of the return spring 419 abuts the first clutch crank 57. After the thread cutting is completed, the reset torsion spring 417 reversely resets the thread cutting crank 44 or the thread cutting fork crank 49, the tension spring 110 reversely resets the first clutch lever 55, and the reset spring 419 moves the first clutch crank 57 rightward to reset, thereby resetting each component in the thread cutting unit 40 and the clutch unit 50.

Further, as shown in fig. 11, a forced return ball 420 is rotatably attached to the first clutch crank 57, and a forced return cam 421 is integrally provided on one end side of the fourth clutch cam 59. After the thread is cut, the thread-cutting drive source 10 is lifted from the end point of the thread-cutting region X2 In the resetting process of rotating in the opposite direction, on one hand, the resetting is driven by the resetting torsion spring 417; if the reset fails, the forced reset ball 420 contacts the cam surface on the outer periphery of the forced reset cam 421 to forcibly drive the first clutch crank 57 to rotate reversely, so as to perform forced reset, and avoid the failure that the movable knife 47 and the fixed knife 48 or the driving knife 411 and the auxiliary movable knife 413 cannot be reset smoothly due to the clamping of the wire hair. In the present embodiment, a first crank arm is provided at the right end of the first clutch crank 57, a second crank arm and a third crank arm are provided at the left end of the first clutch crank 57, a firstThe crank arm, the second crank arm and the third crank arm are distributed in a staggered manner in the circumferential direction, the third clutch ball 58 is arranged at the outer end of the first crank arm, the wire cutting slider 42 is arranged at the outer end of the second crank arm, and the forced reset ball 420 is arranged at the outer end of the third crank arm.

Embodiment III of thread lifting and cutting module

As shown in fig. 20, the clutch unit 50 includes a second clutch crank 510 driven to rotate by the thread-lifting and cutting driving source 10, a fourth clutch ball 511 rotatably mounted on the left end surface of the outer end of the second clutch crank 510, a first clutch link 512, and a transmission crank 513 fixed on the right end of the thread cutting shaft 41 in the thread cutting unit 40, the thread cutting shaft 41 is rotatably supported in the base plate of the modular sewing machine, a free travel chute 5121 extending along the length direction of the first clutch link 512 is opened in the upper section of the first clutch link 512, the fourth clutch ball 511 is located in the free travel chute 5121 of the first clutch link 512 and is in sliding fit with the free travel chute 5121 of the first clutch link 512, the fourth clutch ball 511 and the free travel chute 5121 of the first clutch link 512 form a sliding pair, and the lower end of the first clutch link 512 is hinged with the transmission crank 513. The thread-lifting and cutting driving source 10 is fixed on the bottom plate of the modularized sewing machine.

As shown in fig. 23, the start point and the end point of the feed lifting region X1 of the feed lifting and cutting drive source 10 are respectively anglesAnd->The start point and the end point of the thread cutting region X2 of the thread lifting and cutting driving source 10 are respectively at an angle +.>And->In this embodiment, <' > a-> I.e. the end point of the lifting tooth zone X1Coinciding with the start of the trimming zone X2. When the modularized sewing machine performs sewing operation, the thread lifting and cutting driving source 10 swings back and forth within a certain angle range in the thread lifting region X1, in the process, as shown in fig. 25, the fourth clutch ball 511 slides back and forth in the idle stroke sliding groove 5121 to execute idle stroke action, and the first clutch connecting rod 512 swings back and forth around the hinging center of the first clutch connecting rod 512 and the transmission crank 513 under the action of the fourth clutch ball 511, so that the transmission crank 513 is not driven to rotate, that is, no power transmission exists between the first clutch connecting rod 512 and the transmission crank 513, the transmission crank 513 and the thread cutting shaft 41 do not rotate, and the thread cutting unit 40 does not act. When the modularized sewing machine needs to cut threads, the thread lifting and cutting driving source 10 rotates from the thread lifting area X1 to the thread cutting area X2 along the positive direction, namely clockwise in the view of fig. 23, in the process, as shown in fig. 27, the fourth clutch ball 511 slides upwards along the idle stroke chute 5121 and is abutted with the end part of the upper end groove of the idle stroke chute 5121, and then the second clutch crank 510 drives the first clutch connecting rod 512 to move through the fourth clutch ball 511, so that power is transmitted between the first clutch connecting rod 512 and the transmission crank 513, and further the transmission crank 513 and the thread cutting shaft 41 are driven to rotate, and the thread cutting unit 40 is driven to execute thread cutting action, so that automatic thread cutting is realized.

As shown in fig. 20, the lifting unit 30 has a lifting shaft 31 rotatably supported in the base plate of the modular sewing machine in parallel to the thread cutting shaft 41, and the motor shaft of the lifting thread cutting drive source 10 is coupled to the right end of the lifting shaft 31 through a coupling, and the lifting thread cutting drive source 10 directly drives the lifting shaft 31 to rotate. The second clutch crank 510 is fixed on the motor shaft of the thread-lifting and cutting driving source 10 through a screw, and the thread-lifting and cutting driving source 10 directly drives the second clutch crank 510 to rotate; alternatively, the second clutch crank 510 is fixed to the feed lifting shaft 31 by a screw, and the feed lifting wire cutting driving source 10 drives the second clutch crank 510 to rotate by the feed lifting shaft 31.

As shown in fig. 20, the lifter unit 30 further includes a lifter eccentric crank 32 fixed to the left end of the lifter shaft 31, a lifter link 33, and a lifter pin 34, one end of the lifter link 33 is rotatably fitted over the eccentric portion of the lifter eccentric crank 32 through a bearing, and the other end of the lifter link 33 is hinged to the lifter link 21 of the bracket 20 through the lifter pin 34. When the thread cutting drive source 10 drives the feed dog shaft 31 and the feed dog eccentric crank 32 to swing back and forth within a certain angle range in the feed dog region X1, the feed dog 70 is driven to perform the up-and-down feed dog action by the feed dog connecting portion 21 of the feed dog 20 being driven to reciprocate up and down by the feed dog connecting rod 33.

In this embodiment, the feed lifting and thread cutting drive source 10 outputs an angleWhen the modular sewing machine has a minimum effective lifting height. The output angle of the thread-lifting and cutting driving source 10 is +.>And->At this time, the fourth clutch ball 511 just moves to the upper end slot end of the idle stroke chute 5121, and at this time, as shown in fig. 24, the eccentric crank 32 of the lifting tooth is collinear with the connecting rod 33 of the lifting tooth, that is, the center of the lifting tooth shaft 31, the center of the eccentric part of the eccentric crank 32 of the lifting tooth, and the center of the lifting tooth pin 34 (that is, the hinge center of the connecting rod 33 of the lifting tooth and the lifting tooth connecting part 21 of the frame 20) are collinear, the feed dog 70 is at the limit position, the distance of the feed dog 70 protruding upwards from the needle plate is the largest, and the modular sewing machine has the maximum effective lifting tooth height. In particular, the feed lifting and thread cutting drive source 10 outputs an angleWhen the modularized sewing machine has a negative lifting height, the negative lifting height corresponds to the negative lifting height of the feed dog 70 below the needle plate, namely, the negative lifting height corresponds to the negative lifting height before the moment or the moment, the lifting thread cutting driving source 10 enables the feed dog 70 of the modularized sewing machine not to emerge from the needle plate through the lifting dog unit 30, the feed dog 70 is enabled to sink to the lower side of the needle plate, lower feeding during thread cutting is achieved, the feed dog 70 can not lift the cloth upwards, the distance between the cloth and a thread cutting nip point in the thread cutting unit 40 can be shortened, the length of a thread head remained on the cloth after thread cutting can be shortened, and the thread cutting effect of a short thread head can be stably achieved. Accordingly, the thread-lifting cutting drive source 10 starts from the start point of the thread-lifting region X1 />Rotate in the positive direction to the end point of the tooth lifting zone X1 +.>In the process of (1), the lifting height of the feed dog 70 is gradually increased; when the thread cutting feed lifting drive source 10 is operated in the thread lifting region X1, the posture of the eccentric crank 32 and the thread lifting link 33 are as shown in fig. 26. The thread-lifting cutting driving source 10 starts from the starting point of the thread cutting region X2>Rotate in the positive direction to the end point of the trimming area X2 +.>In the process of (1), the lifting height of the feed dog 70 is gradually reduced; when the thread cutting drive source 10 is operated in the cutting zone X2, the posture of the eccentric crank 32 and the link 33 is as shown in fig. 28.

Embodiment one of thread cutting unit 40 as shown in fig. 21, the thread cutting unit 40 with single-action knife structure further comprises a thread cutting crank 44 fixed at the left end of the thread cutting shaft 41, a thread cutting connecting rod 45, a moving knife rest 46, a moving knife 47 fixed on the moving knife rest 46, a fixed knife 48 fixed on a base plate of the modularized sewing machine, and a reset torsion spring 417 sleeved on the periphery of the thread cutting shaft 41, wherein two ends of the thread cutting connecting rod 45 are respectively hinged with the thread cutting crank 44 and the moving knife rest 46, and two ends of the reset torsion spring 417 are respectively connected with the thread cutting crank 44 and the modularized sewing machine base plate. The thread-lifting cutting driving source 10 starts from the starting point of the thread cutting region X2 Rotate in the positive direction to the end point of the trimming area X2 +.>In the process of (1), the thread cutting shaft 41 drives the thread cutting crank 44 to rotate, and the thread cutting connecting rod 45 drives the movable tool rest 46 to wind downThe shaft 82 rotates to enable the movable knife 47 to rotate towards the direction approaching the fixed knife 48 until the movable knife and the fixed knife are meshed with each other to cut the suture; after the thread cutting is completed, the reset torsion spring 417 reversely resets the thread cutting crank 44, and thus resets each component in the thread cutting unit 40.

In the second embodiment of the thread cutting unit 40, as shown in fig. 22, the thread cutting unit 40 with double-acting knife structure further comprises a thread cutting fork crank 49 fixed at the left end of the thread cutting shaft 41, a thread cutting connecting rod 45, a main knife rest 410, a driving knife 411 fixed on the main knife rest 410, an auxiliary knife rest 412, an auxiliary moving knife 413 and a thread cutting driving pin 414 both fixed on the auxiliary knife rest 412, and a reset torsion spring 417 sleeved on the periphery of the thread cutting shaft 41, wherein the thread cutting fork crank 49 is provided with a fork arm, the thread cutting driving pin 414 is positioned in a fork of the fork arm and is in sliding fit with the fork arm of the thread cutting fork crank 49, two ends of the thread cutting connecting rod 45 are hinged with the thread cutting fork crank 49 and the main knife rest 410 respectively, and two ends of the reset torsion spring 417 are connected with the thread cutting fork crank 49 and a modularized sewing machine bottom plate respectively. The thread-lifting cutting driving source 10 starts from the starting point of the thread cutting region X2 Rotate in the positive direction to the end point of the trimming area X2 +.>In the process, the thread cutting shaft 41 drives the thread cutting fork crank 49 to rotate, and drives the main knife rest 410 and the auxiliary knife rest 412 to rotate along the lower shaft 82 in opposite directions, so that the active knife 411 and the auxiliary movable knife 413 rotate in opposite directions until the active knife 411 and the auxiliary movable knife engage with each other to cut the suture; after the thread cutting is completed, the reset torsion spring 417 reversely resets the thread cutting fork crank 49, and further resets each component in the thread cutting unit 40.

Fourth embodiment of thread-lifting and cutting module

As shown in fig. 29, the clutch unit 50 includes a fifth clutch cam 514 driven to rotate by the thread-lifting and cutting driving source 10, a second clutch lever 515 having a fixed rotation fulcrum, a fifth clutch ball 516 rotatably mounted at a rear end of the second clutch lever 515, and a second clutch link 517; the second clutch lever 515 is hinged to the modularized sewing machine bottom plate through pins extending leftwards and rightwards, and the hinge point of the second clutch lever 515 and the modularized sewing machine bottom plate forms a fixed rotation pivot of the second clutch lever 515; one end of the second clutch link 517 is hinged with the front end of the second clutch lever 515, and the other end of the second clutch link 517 is in driving connection with the thread cutting unit 40.

As shown in fig. 36a, 36b, or 36c, the start point and the end point of the tooth lifting region X1 of the tooth lifting and cutting drive source 10 are respectively angles And->The start point and the end point of the thread cutting region X2 of the thread lifting and cutting driving source 10 are respectively at an angle +.>And->In this embodiment, <' > a->When the modularized sewing machine performs sewing operation, the thread lifting and cutting driving source 10 swings back and forth within a certain angle range in the thread lifting region X1, and in the process, no power is transmitted between the fifth clutch cam 514 and the fifth clutch ball 516, so that the fifth clutch cam 514 does not push the second clutch lever 515 to rotate, and the thread cutting unit 40 does not act. When the modularized sewing machine needs to cut the thread, the thread-lifting cutting driving source 10 rotates from the thread-lifting area X1 to the thread-cutting area X2 along the positive direction, namely the anticlockwise direction in the figure 36a or the figure 36b or the figure 36c, and the thread-lifting cutting driving source 10 is at the beginning of the thread-cutting area X2>Forward rotation to the end point of the trimming zone X2 +.>During this process, power is transferred between the fifth clutch cam 514 and the fifth clutch ball 516, so that the fifth clutch cam 514 pushes the second clutch lever 515 to rotate around its fixed rotation support through the fifth clutch ball 516The point rotates, and then the second clutch connecting rod 517 drives the thread cutting unit 40 to perform thread cutting action, so as to realize automatic thread cutting.

Preferably, as shown in fig. 30, the fifth clutch cam 514 is fixed on the motor shaft of the thread-lifting and cutting driving source 10 by a screw, and the thread-lifting and cutting driving source 10 directly drives the fifth clutch cam 514 to rotate. As shown in fig. 32, the outer peripheral surface of the fifth clutch cam 514 is provided with a variable diameter section; when the thread cutting drive source 10 is operated in the thread cutting region X1, as shown in fig. 33a and 33b, the fifth clutch ball 516 is not in contact with the fifth clutch cam 514 and is separated from the fifth clutch cam 514, so that no power is transmitted between the fifth clutch ball 516 and the fifth clutch cam 514, and the thread cutting unit 40 does not operate; when the thread cutting drive source 10 is operated in the thread cutting region X2, as shown in fig. 34, the fifth clutch ball 516 contacts with the variable diameter section of the fifth clutch cam 514, so that power is transmitted between the fifth clutch ball 516 and the fifth clutch cam 514, and the thread cutting unit 40 operates. Of course, in other embodiments, an isodiametric segment may be provided on the outer peripheral surface of the fifth clutch cam 514; when the thread cutting drive source 10 is operated in the thread lifting region X1, the fifth clutch balls 516 are in contact with the constant diameter section of the fifth clutch cam 514, so that no power transmission between the fifth clutch balls 516 and the fifth clutch cam 514 is realized.

Further, the preferred structure of the tooth lifting unit 30 is: as shown in fig. 30, the lifter unit 30 includes a lifter shaft 31 rotatably supported in a base plate of the modular sewing machine, a primary transmission assembly connected between a motor shaft of the lifter wire cutting driving source 10 and the lifter shaft 31, and a secondary transmission assembly connected between the lifter shaft 31 and the lifter link 21 of the frame 20. Therefore, in this embodiment, the tooth lifting unit 30 adopts a two-stage transmission structure. More specifically, the primary transmission assembly includes a lifting tooth eccentric wheel 35 fixed on a motor shaft of the lifting tooth wire cutting driving source 10 through a screw, a primary lifting tooth connecting rod 36, and a primary lifting tooth crank 37 fixed on the right end of the lifting tooth shaft 31, wherein one end of the primary lifting tooth connecting rod 36 is rotatably sleeved on an eccentric part of the lifting tooth eccentric wheel 35 through a bearing, and the other end of the primary lifting tooth connecting rod 36 is hinged with the primary lifting tooth crank 37. The secondary transmission assembly comprises a secondary lifting tooth crank 38 and a secondary lifting tooth connecting rod 39 which are fixed at the left end of the lifting tooth shaft 31, and two ends of the secondary lifting tooth connecting rod 39 are respectively hinged with the secondary lifting tooth crank 38 and the lifting tooth connecting part 21 of the tooth frame 20; the primary lifting crank 37 and the secondary lifting crank 38 are arranged in a staggered manner at a certain relative angle in the circumferential direction of the lifting shaft 31. Preferably, the lifting tooth eccentric wheel 35 is distributed on the left side of the fifth clutch cam 514, and the lifting tooth eccentric wheel 35 and the fifth clutch cam 514 can be two independent cams or can be combined into an integral cam piece; in the views shown in fig. 30 and 32, the lifting cam 35 and the fifth clutch cam 514 are combined into a single unitary cam member.

Further, when the thread cutting drive source 10 is operated to the end point of the thread cutting region X2Front (comprising lifting the feed line cutting drive source 10 to the end point of the cutting zone X2 +.>When the thread cutting drive source 10 is lifted, the thread feeding teeth 70 of the modularized sewing machine are not ejected from the needle plate through the thread lifting unit 30, namely, the thread feeding teeth 70 sink to the lower part of the needle plate, lower feeding during thread cutting is realized, the thread feeding teeth 70 cannot lift the cloth upwards, the distance between the cloth and the thread cutting nip point in the thread cutting unit 40 can be shortened, the length of thread ends remained on the cloth after thread cutting can be shortened, and the thread cutting effect of the short thread ends can be stably realized.

Further, as shown in fig. 36a, 36b or 36c, the thread-lifting and cutting drive source 10 outputs an angleWhen the modularized sewing machine has the minimum effective lifting height; the output angle of the thread-lifting and cutting driving source 10 is +.>When the modularized sewing machine is in use, the modularized sewing machine has the maximum effective lifting height; the thread-lifting cutting drive source 10 starts from the starting point of the thread-lifting region X1>Rotate in the positive direction to the end point of the tooth lifting zone X1 +.>In the process of the process, the effective lifting tooth height of the sewing machine is gradually increased. In addition, in the thread-lifting cutting drive source 10, the thread-lifting region X1 rotates in the positive direction to the end point of the thread-cutting region X2>In the process of (2), the thread-lifting and cutting driving source 10 outputs an angle +. >At this time, as shown in fig. 35, the eccentric portion of the lifting-tooth eccentric wheel 35 is collinear with the primary lifting-tooth connecting rod 36, that is, the motor shaft center of the lifting-tooth wire cutting driving source 10, the center of the eccentric portion of the lifting-tooth eccentric wheel 35, and the hinge center of the primary lifting-tooth connecting rod 36 and the primary lifting-tooth crank 37 are collinear, and at this time, the feed dog 70 is at the limit position, and the distance from the needle plate to the top is the largest. In particular, the angle of the thread-lifting cutting drive source 10 +.>It is necessary to be smaller than the end point of the trimming area X2 +.>Ensuring the lower supply of thread cutting, the angle of the thread-lifting and cutting driving source 10 is +.>There may be several cases: 1. as shown in fig. 36 a->2. As shown in fig. 36 b->3. As shown in fig. 36 c->Thus, the height of the feed dog 70 is changed during the thread cutting process as follows: firstly, gradually increasing the height of the effective lifting teeth from the current height to be corresponding to +.>The maximum effective height of the angle is gradually increased to correspond to +.>The maximum tooth height of the angle is then gradually reduced to a corresponding +.>Negative values of the angle raise the height of the teeth, which corresponds to feed dog 70 being below the needle plate.

Further, the thread cutting unit 40 may adopt a single-acting knife structure or a double-acting knife structure; in this embodiment, the thread cutting unit 40 adopts a double-acting knife structure. As shown in fig. 31, the thread cutting unit 40 of the double-acting knife structure includes a thread cutting fork crank 49 having a fixed pivot, a thread cutting link 45, a main knife holder 410, a driving knife 411 fixed to the main knife holder 410, an auxiliary knife holder 412, an auxiliary moving knife 413 fixed to the auxiliary knife holder 412, and a thread cutting driving pin 414, the thread cutting fork crank 49 is rotatably mounted on a base plate of the modular sewing machine by a pin, the thread cutting fork crank 49 has a fork arm, the second clutch link 517, the fork arm of the thread cutting fork crank 49, and the auxiliary knife holder 412 are coaxially hinged by the thread cutting driving pin 414, the thread cutting driving pin 414 is located in the fork of the fork arm, both of which are slidably engaged, and both ends of the thread cutting link 45 are hinged with the thread cutting fork crank 49 and the main knife holder 410, respectively. The thread-lifting cutting driving source 10 starts from the starting point of the thread cutting region X2 Rotate in the positive direction to the end point of the trimming area X2 +.>In the process of (2), the fifth clutch cam 514 drives the second clutch lever 515 to rotate through the fifth clutch ball 516, the second clutch lever 515 drives the wire cutting fork opening crank 49 and the auxiliary knife rest 412 to rotate through the second clutch connecting rod 517, and the wire cutting fork opening crank 49 drives the main knife rest 410 to rotate through the wire cutting connecting rod 45, so that the main knife rest 410 and the auxiliary knife rest 412 rotate in opposite directions along the lower shaft 82, and the driving knife 411 and the auxiliary moving knife 413 rotate in opposite directions until the two are rotated in opposite directionsThe suture is cut by occlusion.

Further, as shown in fig. 29, the thread cutting module for lifting the thread further includes a reset torsion spring 417 sleeved at a fixed rotation pivot of the second clutch lever 515, a stop pin 120 fixed on the second clutch lever 515, and a stopper 130 fixed on the bottom plate of the modular sewing machine, wherein two ends of the reset torsion spring 417 are respectively connected with the second clutch lever 515 and the bottom plate of the modular sewing machine. After the thread cutting is finished, the thread cutting driving source 10 is rotated and reset in the opposite direction, the second clutch lever 515 is reversely reset by the spring force of the reset torsion spring 417 until the stop pin 120 is abutted with the stop block 130, and the stop block 130 limits the second clutch lever 515 to the initial position, so that all components in the thread cutting unit 40 are reset. In addition, as shown in fig. 31, a forced return arm 511 is provided on the second clutch lever 515; as shown in fig. 32, the fifth clutch cam 514 is provided with a forced return protrusion 5141; when a reset fault occurs after the thread cutting is finished, the lifting tooth eccentric wheel 35 and the fifth clutch cam 514 rotate along the reverse direction along with the lifting tooth thread cutting driving source 10 to drive the forced reset convex part 5141 to reversely rotate together, the forced reset convex part 5141 gradually approaches to the forced reset arm 511 on the second clutch lever 515, the forced reset convex part 5141 is abutted with the forced reset arm 511 to push the second clutch lever 515 to reversely rotate, and the forced reset is performed, so that the fault that the driving knife 411 and the auxiliary moving knife 413 cannot be smoothly reset due to the fact that the thread is clamped is avoided.

In summary, the present invention effectively overcomes the disadvantages of the prior art and has high industrial utility value.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. A lift tooth and cut line module for modularization sewing machine, its characterized in that: the thread cutting device comprises a thread cutting lifting driving source (10), a thread cutting unit (30), a thread cutting unit (40) and a clutch unit (50), wherein the thread cutting lifting unit (30), the thread cutting unit (40) and the clutch unit (50) are connected with a thread cutting lifting connecting part (21) at one end of a tooth frame (20), the thread cutting driving source (10) is independent of other driving sources in a modularized sewing machine, the output end of the thread cutting driving source (10) is connected with the thread cutting unit (30), and the clutch unit (50) is connected between the output end of the thread cutting driving source (10) and the thread cutting unit (40) or between the thread cutting unit (30) and the thread cutting unit (40);

The operating range of the thread lifting and cutting driving source (10) comprises a thread lifting area and a thread cutting area which are mutually independent; when the thread-lifting and cutting driving source (10) runs in the thread-lifting area, the clutch unit (50) is in a transmission chain separation state; when the thread-lifting and cutting driving source (10) operates in the thread cutting region, the clutch unit (50) is in a transmission chain joint state.

2. The lift-and-shear module of claim 1, wherein: the clutch unit (50) comprises a first clutch cam (51) driven to rotate by the thread lifting and cutting driving source (10), a second clutch cam (52) fixed on a thread cutting shaft (41) in the thread cutting unit (40), and a first clutch ball (53), wherein the first clutch ball (53) is rotatably mounted on the first clutch cam (51) and can be contacted with the second clutch cam (52), or the first clutch ball (53) is rotatably mounted on the second clutch cam (52) and can be contacted with the first clutch cam (51), and the thread cutting shaft (41) is rotatably supported in a base plate of the modularized sewing machine.

3. The lift-and-shear module of claim 1, wherein: the clutch unit (50) comprises a third clutch cam (54) driven to rotate by the thread lifting and cutting driving source (10), a first clutch lever (55) with a fixed rotation pivot, a second clutch ball (56) rotatably mounted on the first clutch lever (55), a first clutch crank (57) fixed on a thread cutting shaft (41) in the thread cutting unit (40), a third clutch ball (58) rotatably mounted on the first clutch crank (57), and a fourth clutch cam (59) fixed on a lower shaft (82) in the modularized sewing machine, wherein the second clutch ball (56) can be abutted with the third clutch cam (54), and the third clutch ball (58) can be abutted with the fourth clutch cam (59); the shear shaft (41) is rotatably and movably supported in the modularized sewing machine bottom plate, a pushing convex part (571) is arranged on the first clutch crank (57), and the first clutch lever (55) is abutted against the pushing convex part (571).

4. A thread lifting shear module according to claim 3, wherein: the thread cutting unit (40) further comprises a thread cutting sliding block (42), a thread cutting crank shaft (43), a thread cutting crank (44), a thread cutting connecting rod (45), a movable knife rest (46), a movable knife (47) fixed on the movable knife rest (46) and a fixed knife (48) fixed on a base plate of the modularized sewing machine, the thread cutting sliding block (42) is rotatably arranged on the first clutch crank (57), the thread cutting crank shaft (43) comprises a transmission shaft part which is parallel to the thread cutting shaft (41) and is rotatably supported in the base plate of the modularized sewing machine, and a crank part which is integrally arranged at one end of the transmission shaft part, a thread cutting sliding groove (431) which is in sliding fit with the thread cutting sliding block (42) is formed in the crank part, the thread cutting crank (44) is fixed at the other end of the transmission shaft part, and two ends of the thread cutting connecting rod (45) are respectively hinged with the thread cutting crank (44) and the movable knife rest (46).

5. A thread lifting shear module according to claim 3, wherein: the thread cutting unit (40) further comprises a thread cutting sliding block (42), a thread cutting crank shaft (43), a thread cutting fork opening crank (49), a thread cutting connecting rod (45), a main knife rest (410), a driving knife (411) fixed on the main knife rest (410), an auxiliary knife rest (412) and an auxiliary movable knife (413) and a thread cutting transmission pin (414) which are all fixed on the auxiliary knife rest (412), the thread cutting crank shaft (43) comprises a transmission shaft part which is parallel to the thread cutting shaft (41) and rotatably supported in a modularized sewing machine bottom plate, and a crank part integrally arranged at one end of the transmission shaft part, a thread cutting sliding groove (431) which is in sliding fit with the thread cutting sliding block (42) is formed in the crank part, the thread cutting fork opening crank (49) is fixed at the other end of the transmission shaft part, the thread cutting fork opening crank (49) is provided with a fork opening arm part, the thread cutting transmission pin (414) is positioned in a fork opening of the fork opening arm part and is in sliding fit with the two ends of the main knife rest (45), and the thread cutting connecting rod (45) is hinged with the crank opening crank (49) and the thread cutting fork opening (410) respectively.

6. The lift-and-shear module of claim 1, wherein: the clutch unit (50) comprises a second clutch crank (510) driven by the thread lifting and cutting driving source (10) to rotate, a fourth clutch ball (511) rotatably mounted on the second clutch crank (510), a first clutch connecting rod (512) and a transmission crank (513) fixed on a thread cutting shaft (41) in the thread cutting unit (40), a free stroke sliding groove (5121) extending along the length direction of the first clutch connecting rod (512) is formed in the first clutch connecting rod (512), the fourth clutch ball (511) is located in the free stroke sliding groove (5121) of the first clutch connecting rod (512) and is in sliding fit with the first clutch connecting rod, the first clutch connecting rod (512) is hinged with the transmission crank (513), and the thread cutting shaft (41) is rotatably supported in a base plate of the modularized sewing machine.

7. The thread-lifting shear module of claim 2, 3 or 6, wherein: the thread cutting drive source (10) is a motor, the thread cutting unit (30) comprises a thread cutting shaft (31) rotatably supported in a bottom plate of the modularized sewing machine, a thread cutting eccentric crank (32) fixed on the thread cutting shaft (31), a thread cutting connecting rod (33) and a thread cutting pin (34), the thread cutting shaft (31) is fixedly connected with a motor shaft of the thread cutting drive source (10), one end of the thread cutting connecting rod (33) is rotatably sleeved on the eccentric part of the thread cutting eccentric crank (32), and the other end of the thread cutting connecting rod (33) is hinged with a thread cutting connecting part (21) of the tooth frame (20) through the thread cutting pin (34).

8. The lift-and-shear module of claim 2 or 6, wherein: the thread cutting unit (40) further comprises a thread cutting crank (44), a thread cutting connecting rod (45), a movable cutter holder (46), a movable cutter (47) and a fixed cutter (48), wherein the thread cutting crank (44) is fixed on the thread cutting shaft (41), the movable cutter (47) is fixed on the movable cutter holder (46), the fixed cutter (48) is fixed on a middle bottom plate of the modularized sewing machine, and two ends of the thread cutting connecting rod (45) are hinged with the thread cutting crank (44) and the movable cutter holder (46) respectively.

9. The lift-and-shear module of claim 2 or 6, wherein: the wire cutting unit (40) further comprises a wire cutting fork opening crank (49), a wire cutting connecting rod (45), a main cutter frame (410), a driving cutter (411), an auxiliary cutter frame (412) and an auxiliary movable cutter (413) and a wire cutting transmission pin (414), wherein the wire cutting fork opening crank (49) is fixed on the wire cutting shaft (41), the wire cutting transmission pin (414) is positioned in a fork opening of the fork opening arm and is in sliding fit with the fork opening of the fork opening arm, and two ends of the wire cutting connecting rod (45) are hinged with the wire cutting fork opening crank (49) and the main cutter frame (410) respectively.

10. The lift-and-shear module of claim 2 or 6, wherein: the wire cutting unit further comprises a wire cutting crank (44), a wire cutting main connecting rod (415), a main cutter frame (410), a driving cutter (411), a wire cutting auxiliary connecting rod (416), an auxiliary cutter frame (412) and an auxiliary movable cutter (413) fixed on the auxiliary cutter frame (412), wherein the wire cutting crank (44), the wire cutting main connecting rod (415), the driving cutter (411), the wire cutting auxiliary connecting rod (416), the auxiliary movable cutter (413) and the auxiliary cutter frame (412) are fixed on the main cutter frame (410), a first wire cutting arm (441) and a second wire cutting arm (442) which are distributed in a circumferential dislocation mode are arranged on the periphery of the wire cutting crank (44), and two ends of the wire cutting main connecting rod (415) are hinged to the first wire cutting arm (441) and the main cutter frame (410) respectively, and two ends of the wire cutting auxiliary connecting rod (416) are hinged to the second wire cutting arm (442) and the auxiliary cutter frame (412) respectively.

11. The lift-and-shear module of claim 1, wherein: the clutch unit (50) comprises a fifth clutch cam (514) driven by the thread lifting and cutting driving source (10) to rotate, a second clutch lever (515) with a fixed rotation fulcrum, a fifth clutch ball (516) rotatably arranged on the second clutch lever (515), and a second clutch connecting rod (517) with one end hinged with the second clutch lever (515), wherein the other end of the second clutch connecting rod (517) is in transmission connection with the thread cutting unit (40).

12. The lift-and-shear module of claim 11, wherein: the thread-lifting and cutting driving source (10) is a motor, and the thread-lifting unit (30) comprises a thread-lifting shaft (31) rotatably supported in a base plate of the modularized sewing machine, a primary transmission component connected between a motor shaft of the thread-lifting and cutting driving source (10) and the thread-lifting shaft (31), and a secondary transmission component connected between the thread-lifting shaft (31) and a thread-lifting connecting part (21) of the tooth frame (20); the primary transmission assembly comprises a lifting tooth eccentric wheel (35) fixed on a motor shaft of the lifting tooth wire cutting driving source (10), a primary lifting tooth connecting rod (36) and a primary lifting tooth crank (37) fixed on the lifting tooth shaft (31), one end of the primary lifting tooth connecting rod (36) is rotatably sleeved on the eccentric part of the lifting tooth eccentric wheel (35), and the other end of the primary lifting tooth connecting rod (36) is hinged with the primary lifting tooth crank (37); the secondary transmission assembly comprises a secondary lifting tooth crank (38) and a secondary lifting tooth connecting rod (39), wherein the secondary lifting tooth crank (38) is fixed on the lifting tooth shaft (31), and two ends of the secondary lifting tooth connecting rod (39) are hinged with the secondary lifting tooth crank (38) and the lifting tooth connecting part (21) of the tooth frame (20) respectively.

13. The lift-and-shear module of claim 11, wherein: the wire cutting unit (40) comprises a wire cutting fork opening crank (49) with a fixed rotation fulcrum, a wire cutting connecting rod (45), a main cutter frame (410), a driving cutter (411) fixed on the main cutter frame (410), an auxiliary cutter frame (412), an auxiliary moving cutter (413) fixed on the auxiliary cutter frame (412) and a wire cutting transmission pin (414), the wire cutting fork opening crank (49) is provided with a fork opening arm part, the second clutch connecting rod (517), the fork opening arm part of the wire cutting fork opening crank (49) and the auxiliary cutter frame (412) are hinged coaxially through the wire cutting transmission pin (414), the wire cutting transmission pin (414) is positioned in a fork opening of the fork opening arm part and is in sliding fit with the fork opening of the fork opening arm part, and two ends of the wire cutting connecting rod (45) are hinged with the wire cutting fork opening crank (49) and the main cutter frame (410) respectively.

14. The lift-and-shear module of claim 1, wherein: before the thread-lifting and cutting driving source (10) runs to the end point of the thread-cutting area, the thread-lifting and cutting driving source (10) enables the feed dog (70) of the modularized sewing machine not to emerge from the needle plate through the thread-lifting unit (30).

15. A modular sewing machine, characterized by: the modular sewing machine having the thread-lifting and cutting module of any one of claims 1-14 disposed therein.