CN218203373U - A lifting teeth thread trimming module and modularization sewing machine for modularization sewing machine - Google Patents

Abstract

The utility model provides a lifting tooth thread trimming module and modularization sewing machine for modularization sewing machine, lifting tooth thread trimming module include lifting tooth thread trimming driving source, lifting tooth unit, thread trimming unit and the clutch unit that links to each other with the lifting tooth connecting portion of dental articulator one end, lifting tooth thread trimming driving source is independent of other driving sources in the modularization sewing machine, the output of lifting tooth thread trimming driving source links to each other with the lifting tooth unit; the clutch unit comprises a clutch cam driven by a tooth lifting thread trimming driving source to rotate, a clutch lever with a fixed rotating fulcrum, a clutch ball rotatably arranged on the clutch lever, and a clutch connecting rod with one end hinged with the clutch lever, and the other end of the clutch connecting rod is in transmission connection with the thread trimming unit. According to the method, the feed lifting function and the thread trimming function are integrated into a feed lifting thread trimming module, so that the method is suitable for a modularized sewing machine, and the sewing adaptability is effectively improved; the switching between the tooth lifting function and the thread trimming function of the tooth lifting thread trimming module is carried out through the clutch unit, so that the tooth lifting function and the thread trimming function are ensured not to interfere with each other.

Description

A lifting teeth thread trimming module and modularization sewing machine for modularization sewing machine

Technical Field

The utility model relates to a sewing machine field especially relates to a modularization sewing machine and be used for this modularization sewing machine's lifting teeth thread trimming module.

Background

At present, each large sewing machine company has a design platform, a feeding mechanism, a tooth lifting mechanism, a thread cutting 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 updating based on the design platform, and another brand new design platform can hardly be researched and developed.

At present, all sewing machines are all integrated machines, namely, a main motor is adopted to drive the cloth needling, the thread picking, the feeding and the thread hooking at the same time, and the structure is very complex. For example, the conventional sewing machine shown in fig. 1 mainly includes a main motor, a main shaft 100 driven to rotate by the main motor, a cloth-stabbing thread-taking-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 cloth-stabbing thread-taking-up mechanism 200, the feeding mechanism 300, and the thread-hooking mechanism 400 are all driven to operate by the main shaft 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 operates, the main motor drives the main shaft 100 to rotate, the main shaft 100 drives the cloth pricking and taking-up mechanism 200, the feeding mechanism 300 and the thread hooking mechanism 400 to operate, and the cloth pricking and taking-up mechanism 200, the feeding mechanism 300 and the thread hooking mechanism 400 cooperatively act to complete sewing; when the thread needs to be cut, the thread cutting driving source 501 acts to enable the transmission component in the thread cutting mechanism 500 to be matched with the thread cutting cam, the main shaft 100 rotates to enable the lower shaft in the thread hooking mechanism 400 to rotate, and therefore the thread cutting mechanism 500 executes the thread cutting action; when the presser foot needs to be lifted, the presser foot lifting drive source 601 operates 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 delivery 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 tooth frame, a first feed delivery unit connected between the main shaft and the feed delivery shaft, and a second feed delivery unit connected between the feed delivery shaft and the front end of the tooth frame. The main shaft drives the tooth rack 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 main shaft drives the tooth frame and the feed dog to do reciprocating motion back and forth through the first feed unit, the feed shaft and the second feed unit so as to perform feed action.

The main structure of the thread hooking mechanism 400 is as follows: 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 component fixed at the left end of the lower shaft.

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

Therefore, as can be seen from the above description of the structure, the feeding mechanism (including the front and rear feeding mechanisms and the upper and lower feed lifting mechanisms) and the thread trimming mechanism in the existing sewing machine have very complicated structures, a large number of parts, long transmission chain length, need to additionally provide a clutch driving source for matching to realize thread trimming, and the feeding mechanism and the thread trimming mechanism have single function, and during thread trimming, the feed dog may protrude upwards from the needle plate, which results in unstable thread end length remaining on the cloth after thread trimming.

SUMMERY OF THE UTILITY MODEL

In view of the above prior art, the to-be-solved technical problem of the present invention is to provide a thread lifting and trimming module for a modular sewing machine, which integrates the thread lifting function and the trimming function into a whole module, and can be integrally used in the modular sewing machine.

In order to achieve the above object, the present invention provides a feed lifting and thread cutting module for a modular sewing machine, comprising a feed lifting and thread cutting drive source, a feed lifting unit connected to a feed lifting connection portion at one end of a thread frame, a thread cutting unit, and a clutch unit, wherein the feed lifting and thread cutting drive source is independent of other drive sources in the modular sewing machine, and an output end of the feed lifting and thread cutting drive source is connected to the feed lifting unit;

the clutch unit comprises a clutch cam driven by a tooth lifting and wire shearing driving source to rotate, a clutch lever with a fixed rotating fulcrum, a clutch ball rotatably arranged on the clutch lever, and a clutch connecting rod with one end hinged with the clutch lever, and the other end of the clutch connecting rod is in transmission connection with the wire shearing unit;

the running range of the tooth lifting and thread cutting driving source comprises a tooth lifting area and a thread cutting area which are mutually independent; when the tooth lifting thread trimming driving source operates in the tooth lifting area, no power is transmitted between the clutch cam and the clutch ball; when the tooth lifting thread trimming driving source operates in the thread trimming area, power is transmitted between the clutch cam and the clutch ball.

Furthermore, the tooth lifting thread trimming driving source is a motor, and the clutch cam is fixed on a motor shaft of the tooth lifting thread trimming driving source.

Further, the feed lifting unit comprises a feed lifting shaft rotatably supported in the bottom plate of the modular sewing machine, a primary transmission assembly connected between a motor shaft of the feed lifting thread trimming drive source and the feed lifting shaft, and a secondary transmission assembly connected between the feed lifting shaft and the feed lifting connecting part of the feed lifting frame.

Furthermore, the primary transmission assembly comprises a tooth lifting eccentric wheel fixed on a motor shaft of the tooth lifting trimming driving source, a primary tooth lifting connecting rod and a primary tooth lifting crank fixed on the tooth lifting shaft, one end of the primary tooth lifting connecting rod is rotatably sleeved on an eccentric part of the tooth lifting eccentric wheel, and the other end of the primary tooth lifting connecting rod is hinged with the primary tooth lifting crank.

Furthermore, the second-stage transmission assembly comprises a second-stage feed lifting crank fixed on the feed lifting shaft and a second-stage feed lifting connecting rod, and two ends of the second-stage feed lifting connecting rod are hinged to the second-stage feed lifting crank and the feed lifting connecting part of the feed lifting frame respectively.

Further, the trimming unit comprises a trimming fork crank with a fixed rotating fulcrum, a trimming connecting rod, a main knife rest, a driving knife fixed on the main knife rest, an auxiliary knife fixed on the auxiliary knife rest and a trimming transmission pin, wherein the trimming fork crank is provided with a fork arm, the clutch connecting rod, the trimming fork arm and the auxiliary knife rest are hinged through the trimming transmission pin in a coaxial line manner, the trimming transmission pin is located in a fork of the fork arm and is in sliding fit with the fork arm, and two ends of the trimming connecting rod are hinged with the trimming fork crank and the main knife rest respectively.

Furthermore, the tooth lifting thread trimming module further comprises a torsion spring sleeved at a fixed rotating fulcrum of the clutch lever, and two ends of the torsion spring are respectively connected with the clutch lever and the bottom plate of the modular sewing machine.

Furthermore, a forced reset arm is arranged on the clutch lever, a forced reset convex part is arranged on the clutch cam, and the forced reset arm can be abutted against the forced reset convex part.

Further, before the feed lifting tooth thread trimming driving source operates to the end point of the thread trimming area, the feed lifting tooth thread trimming driving source enables the feed dog of the modular sewing machine not to be protruded out of the needle plate through the feed lifting tooth unit.

The present application further provides a modular sewing machine, the modular sewing machine is provided with the tooth lifting thread cutting module.

Furthermore, a feeding module is further configured in the modular sewing machine, the feeding module comprises a feeding driving source and a feeding unit connected with a feeding connecting part at the other end of the toothed rack, the feed lifting thread trimming driving source and the feeding driving source are two mutually independent driving sources, the feeding unit comprises a feeding crank, a feeding connecting rod and a toothed rack seat which are rotatably supported in a base plate of the modular sewing machine, the feeding crank and the toothed rack seat are driven to rotate by the feeding driving source, two ends of the feeding connecting rod are respectively hinged with the feeding connecting rod, and the toothed rack seat is hinged with the feeding connecting part of the toothed rack.

As described above, the utility model relates to a lifting teeth thread trimming module and modularization sewing machine for modularization sewing machine has following beneficial effect:

according to the feed lifting tooth thread cutting module, the feed lifting tooth thread cutting function and the thread cutting function are integrated into the feed lifting tooth thread cutting module, and the feed lifting tooth thread cutting driving source is independently driven, so that the feed lifting tooth thread cutting module is suitable for a modularized sewing machine, and the sewing adaptability is effectively improved; particularly, the tooth lifting function and the thread trimming function of the tooth lifting thread trimming module are switched through the clutch unit, so that the tooth lifting function and the thread trimming function are ensured not to interfere with each other.

Drawings

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

Fig. 2 is a schematic structural view of the modular sewing machine of the present application.

Fig. 3 is a schematic structural diagram of the tooth lifting unit of the present application.

Fig. 4 is a schematic structural diagram of a clutch unit and a thread trimming unit according to the present application.

Fig. 5 is a schematic structural diagram of a clutch cam and a lifting tooth eccentric wheel of the application.

Fig. 6 is a schematic structural diagram of a feeding module according to the present application.

Fig. 7a and 7b are schematic views of the feed lifting thread trimming module of the present application in a normal sewing state.

Fig. 8 is a schematic view of the tooth lifting thread trimming module of the present application in a thread trimming process.

FIG. 9 shows the output angle of the tooth lifting and thread trimming driving source according to the present application

The state diagram of a primary transmission assembly in the tooth lifting unit.

Fig. 10a to 10c are schematic views of three embodiments of the distribution of the operating angles of the tooth lifting shear line driving source according to the present application.

Description of the element reference

10. Feed-lifting thread-cutting driving source

20. Tooth holder

21. Feed lifting tooth connecting part

22. Feeding connecting part

30. Feed lifting unit

31. Feed lifting shaft

32. Feed lifting eccentric wheel

33. One-level feed lifting connecting rod

34. First-level feed lifting crank

35. Two-stage feed lifting crank

36. Two-stage tooth lifting connecting rod

40. Thread trimming unit

41. Thread cutting fork crank

42. Trimming connecting rod

43. Main tool rest

44. Driving knife

45. Auxiliary tool rest

46. Auxiliary moving knife

47. Trimming transmission pin

50. Clutch unit

51. Clutch cam

511. Forced reset convex part

52. Clutch lever

521. Forced reset arm

53. Clutch ball

54. Clutch connecting rod

55. Torsion spring

60. Feeding module

61. Feeding driving source

62. Feeding crank

63. Feeding connecting rod

64. Dental articulator holder

65. Feeding shaft

70. Feed dog

80. Stop pin

90. Limiting block

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

It should be understood that the drawings of the present application are only used to match the contents disclosed in the specification, so as to be known and read by those skilled in the art, and not to limit the practical limitations of the present invention, so that the present application does not have any technical significance, and any modification of the structure, change of the ratio relationship, or adjustment of the size should still fall within the scope of the present application without affecting the function and the achievable purpose of the present application. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", and the like used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be considered as the scope of the present invention without substantial changes in the technical content.

The utility model provides a modularization sewing machine especially provides a lifting teeth thread trimming module who is used for this modularization sewing machine. For convenience of description, in the following embodiments, the length direction of the modular sewing machine is defined as the left-right direction, the width direction of the modular sewing machine is defined as the front-back direction, and the height direction of the modular sewing machine is defined as the up-down direction; meanwhile, the left direction is the direction towards the machine head of the modular sewing machine, the right direction is the direction towards the machine tail of the modular sewing machine, and the front direction is the moving direction of cloth when the modular sewing machine performs front sewing.

As shown in fig. 2, the present invention relates to a modular sewing machine, which is provided with a feed module 60, a stab-in module, a thread take-up module, a thread hooking module, a thread frame 20, and a feed dog 70 fixedly mounted on the thread frame 20, wherein the stab-in module, the thread take-up module and the thread hooking module are not shown in fig. 2. The feed module 60, the cloth-stabbing module, the thread-taking-up module and the thread-hooking module are functional modules of the modular sewing machine, and the cloth-stabbing module and the thread-taking-up module can be combined into one cloth-stabbing thread-taking-up module or can be two independent functional modules. In the modularization sewing machine, each functional module all adopts independent driving source to drive, make mutual independence, mutual noninterference between each functional module of modularization sewing machine, the driving chain of each functional module has been shortened on the one hand, avoid because of the vibration that the driving chain overlength caused, the noise scheduling problem, on the other hand can adjust the relative motion chronogenesis and the motion law of each functional module, for example can adjust the morning and evening of the line-hooking moment of the relative thorn cloth module of shuttle in the module of colluding line machine needle, the motion trail of adjustment feed dog 70 etc. among the relative thorn cloth module of shuttle, thereby promote sewing adaptability greatly.

The following description of a preferred embodiment of the tooth lifting trimming module and the feeder module 60 is provided.

Feed lifting thread trimming module

As shown in fig. 2, the rear end and the front end of the dental articulator 20 are respectively provided with a feed connection part 22 and a feed connection part 21; the feed lifting tooth thread trimming module comprises a feed lifting tooth thread trimming driving source 10, a feed lifting tooth unit 30, a thread trimming unit 40 and a clutch unit 50, wherein the feed lifting tooth thread trimming driving source 10 is independent of other driving sources in the modular sewing machine, the output end of the feed lifting tooth thread trimming driving source 10 is connected with the feed lifting tooth unit 30, the feed lifting tooth unit 30 is connected with a feed lifting tooth connecting part 21 at the rear end of a feed lifting tooth frame 20, and the feed lifting tooth frame 20 and a feed feeding tooth 70 are driven to reciprocate up and down to execute feed lifting tooth action; the feeding module 60 is connected with the feeding connecting part 22 at the front end of the dental articulator 20, and drives the dental articulator 20 and the feed dog 70 to reciprocate back and forth to perform a cloth feeding action; the up-and-down reciprocating motion and the back-and-forth reciprocating motion of the feed dog 70 are combined into a motion trajectory of the feed dog 70. Thus, the feed module 60 and the feed module feed together form a "feed-thread-trimming mechanism" of the modular sewing machine.

As shown in fig. 2, the clutch unit 50 includes a clutch cam 51 driven to rotate by the tooth lifting thread trimming drive source 10, a clutch lever 52 having a fixed rotation fulcrum, a clutch ball 53 rotatably mounted at a rear end of the clutch lever 52, and a clutch link 54; the clutch lever 52 is hinged to the bottom plate of the modular sewing machine through pins extending left and right, and the hinged point of the clutch lever 52 and the bottom plate of the modular sewing machine forms a fixed rotating fulcrum of the clutch lever 52; one end of the clutch connecting rod 54 is hinged with the front end of the clutch lever 52, and the other end of the clutch connecting rod 54 is in transmission connection with the thread trimming unit 40.

The tooth lifting thread cutting driving source 10 is a motor, such as a stepping motor and a servo motor. As shown in fig. 10a, 10b or 10c, the operating range of the tooth lifting thread trimming driving source 10 includes a tooth lifting area X1 and a thread trimming area X2 which are independent of each other, and the start point and the end point of the tooth lifting area X1 are respectively an angle

And

the starting point and the end point of the cutting line region X2 are respectively angles

And

in the present embodiment, the first and second electrodes are,

when the modular sewing machine is used for sewing, the feed lifting teeth thread cutting driving source 10 swings back and forth within a certain angle range in the feed lifting teeth area X1, and the angle range corresponds to the dieSetting the height of a lifting tooth of a blocking sewing machine; in this process, no power is transmitted between the clutch cam 51 and the clutch ball 53, so that the clutch cam 51 does not push the clutch lever 52 to rotate, and the thread trimming unit 40 does not operate. When the modularized sewing machine needs to cut thread, the feed lifting thread cutting driving source 10 rotates from the feed lifting area X1 to the thread cutting area X2 along the positive direction, i.e. the counterclockwise direction in fig. 10a or 10b or 10c, and at the starting point of the feed lifting thread cutting driving source 10 from the thread cutting area X2

Forward rotation to the end point of the trimming area X2

In the process, power is transmitted between the clutch cam 51 and the clutch ball 53, so that the clutch cam 51 pushes the clutch lever 52 to rotate around the fixed rotating fulcrum thereof through the clutch ball 53, and further the thread trimming unit 40 is driven to perform thread trimming through the clutch connecting rod 54, thereby realizing automatic thread trimming. Therefore, the temperature of the molten metal is controlled, the clutch unit 50 can be understood as a thread trimming transmission part of the tooth lifting thread trimming module; the thread trimming unit 40 can be understood as a thread trimming execution part of the tooth lifting thread trimming module. The feed dog thread trimming module integrates the feed dog function and the thread trimming function of the modular sewing machine, adopts the independent feed dog thread trimming driving source 10 to carry out independent driving, is suitable for the modular sewing machine, changes the feed dog height of the feed dog 70 by changing the swing amplitude of the feed dog thread trimming driving source 10, and effectively improves the sewing adaptability; particularly, the clutch unit 50 switches the tooth lifting function and the thread trimming function of the tooth lifting and thread trimming module, thereby ensuring that the tooth lifting function and the thread trimming function do not interfere with each other.

Preferably, as shown in fig. 3, the clutch cam 51 is fixed on a motor shaft of the tooth lifting thread trimming driving source 10 by a screw, and the tooth lifting thread trimming driving source 10 directly drives the clutch cam 51 to rotate. As shown in fig. 5, the outer peripheral surface of the clutch cam 51 is provided with a diameter-changing section; when the tooth lifting thread trimming driving source 10 operates in the tooth lifting area X1, as shown in fig. 7a and 7b, the clutch ball 53 is not in contact with the clutch cam 51, and the clutch ball 53 and the clutch cam 51 are separated from each other, so that no power is transmitted between the clutch ball 53 and the clutch cam 51, and the thread trimming unit 40 does not operate; when the feed-off thread trimming drive source 10 operates in the trimming region X2, as shown in fig. 8, the clutch ball 53 contacts with the reduced diameter section of the clutch cam 51, so that power is transmitted between the clutch ball 53 and the clutch cam 51, and the trimming unit 40 operates. Of course, in other embodiments, an equal diameter section may be provided on the outer peripheral surface of the clutch cam 51; when the tooth lifting shear line driving source 10 operates in the tooth lifting area X1, the clutch ball 53 is in contact with the equal-diameter section of the clutch cam 51, so that no power transmission is realized between the clutch ball 53 and the clutch cam 51.

Further, the preferred structure of the tooth lifting unit 30 is: as shown in fig. 3, the feed dog unit 30 includes a feed dog shaft 31 rotatably supported in the bottom plate of the modular sewing machine, a primary transmission assembly connected between a motor shaft of the feed dog thread trimming drive source 10 and the feed dog shaft 31, and a secondary transmission assembly connected between the feed dog shaft 31 and the feed dog attaching portion 21 of the feed dog housing 20. Therefore, in the present embodiment, the tooth lifting unit 30 adopts a two-stage transmission structure. More specifically, the primary transmission assembly comprises a tooth lifting eccentric wheel 32 fixed on a motor shaft of the tooth lifting trimming driving source 10 through screws, a primary tooth lifting connecting rod 33 and a primary tooth lifting crank 34 fixed at the right end of the tooth lifting shaft 31, one end of the primary tooth lifting connecting rod 33 is rotatably sleeved on an eccentric part of the tooth lifting eccentric wheel 32 through a bearing, and the other end of the primary tooth lifting connecting rod 33 is hinged with the primary tooth lifting crank 34. The secondary transmission component comprises a secondary feed lifting crank 35 fixed at the left end of the feed lifting shaft 31 and a secondary feed lifting connecting rod 36, and two ends of the secondary feed lifting connecting rod 36 are respectively hinged with the secondary feed lifting crank 35 and the feed lifting connecting part 21 of the tooth frame 20; the primary feed lifting rock crank 34 and the secondary feed lifting rock crank 35 are arranged in a staggered manner at a certain relative angle in the circumferential direction of the feed lifting rock shaft 31. Preferably, the cam lifter 32 is arranged at the left side of the clutch cam 51, and the cam lifter 32 and the clutch cam 51 can be two independent cams or can be combined into an integral cam; in the illustration shown in fig. 3 and 5, the cam disk 32 and the clutch cam 51 are combined into a one-piece cam part.

Further, when the tooth-lifting thread-cutting driving source 10 is operated to the end point of the thread-cutting region X2

Front (including the operation of the tooth-lifting thread-cutting driving source 10 to the end point of the thread-cutting region X2

In the meantime), the feed dog 70 of the modular sewing machine is not protruded from the needle plate by the feed dog trimming driving source 10 through the feed dog unit 30, that is, the feed dog 70 sinks below the needle plate, so that the lower supply during trimming is realized, the feed dog 70 does not lift up the cloth, the distance between the cloth and the trimming nip point in the trimming unit 40 can be shortened, the length of the thread end remained on the cloth after trimming can be shortened, and the trimming effect of the short thread end can be stably realized. Therefore, the feed dog 70 is lowered from the needle plate by the feed dog raising unit 30 at the thread cutting area X2.

Further, as shown in fig. 10a or 10b or 10c, the feed-out angle of the feed-out driving source 10 is increased

The modular sewing machine has the minimum effective feed lifting height; output angle of feed lifting thread cutting driving source 10

The modular sewing machine has the maximum effective tooth lifting height; the feed-up thread trimming drive source 10 starts from the feed-up area X1

Rotates to the end point of the tooth lifting area X1 along the positive direction

In the process, the effective feed lifting tooth height of the sewing machine is gradually increased. In addition, the tooth-lifting thread-cutting drive source 10 rotates in the positive direction from the inside of the tooth-lifting area X1 to the end point of the thread-cutting area X2

In the process, the tooth lifting and thread cutting driving source 10 outputs an angle

At this time, as shown in fig. 9, the eccentric portion of the feed dog eccentric wheel 32 is collinear with the primary feed dog connecting rod 33, that is, the center of the motor shaft of the feed dog trimming driving source 10, the center of the eccentric portion of the feed dog eccentric wheel 32, and the hinge center of the primary feed dog connecting rod 33 and the primary feed dog crank 34 are collinear, and the feed dog 70 is at the limit position and protrudes upward from the needle plate by the maximum distance. In particular, the angle of the feed-forward drive source 10

Needs to be smaller than the end point of the line shearing region X2

Ensuring the supply at the time of trimming, the angle of the tooth lifting trimming driving source 10

There may be several cases as follows: 1. as shown in figure 10a of the drawings,

2. as shown in figure 10b of the drawings,

3. as shown in figure 10c of the drawings,

thus, the change of the feed dog 70 in the feed dog height during the thread trimming process is: the effective tooth lifting height is gradually increased to correspond to the effective tooth lifting height

The maximum effective tooth lifting height of the angle is gradually increased to correspond to

The maximum tooth lifting height of the angle is gradually reduced to correspond to

Negative value of angle feed-up heightThe negative feed dog height corresponds to feed dog 70 being below the needle plate.

Further, the thread trimming unit 40 may adopt a single-action knife structure or a double-action knife structure; in this embodiment, the thread trimming unit 40 adopts a double-action knife structure. As shown in fig. 4, the thread trimming unit 40 of the double-moving-blade structure includes a thread trimming jaw crank 41 having a fixed rotation fulcrum, a thread trimming connecting rod 42, a main blade holder 43, a main blade 44 fixed on the main blade holder 43, an auxiliary blade holder 45, an auxiliary blade 46 fixed on the auxiliary blade holder 45, and a thread trimming driving pin 47, the thread trimming jaw crank 41 is rotatably mounted on the base plate of the modular sewing machine through a pin, the thread trimming jaw crank 41 has a jaw arm, a clutch connecting rod 54, the jaw arm of the thread trimming jaw crank 41, and the auxiliary blade holder 45 are coaxially hinged through the thread trimming driving pin 47, the thread trimming driving pin 47 is located in the jaw of the jaw arm and is in sliding fit with the jaw arm, and both ends of the thread trimming connecting rod 42 are respectively hinged with the thread trimming jaw crank 41 and the main blade holder 43. The feed-off drive source 10 starts from the cutting area X2

Rotates to the end point of the trimming area X2 along the positive direction

In the process, the clutch cam 51 drives the clutch lever 52 to rotate through the clutch ball 53, the clutch lever 52 drives the trimming fork crank 41 and the auxiliary knife rest 45 to rotate through the clutch connecting rod 54, the trimming fork crank 41 drives the main knife rest 43 to rotate through the trimming connecting rod 42, the main knife rest 43 and the auxiliary knife rest 45 are enabled to rotate along the lower shaft in the opposite direction, and the driving knife 44 and the auxiliary knife 46 rotate in the opposite direction until the driving knife 44 and the auxiliary knife 46 are meshed with each other to cut off the suture.

Further, as shown in fig. 2, the thread lifting and trimming module further includes a torsion spring 55 sleeved at a fixed rotation fulcrum of the clutch lever 52, a stop pin 80 fixed on the clutch lever 52, and a limit block 90 fixed on the bottom plate of the modular sewing machine, wherein two ends of the torsion spring 55 are respectively connected to the clutch lever 52 and the bottom plate of the modular sewing machine. After the thread trimming is finished, the tooth lifting thread trimming driving source 10 rotates in the opposite direction to reset, the clutch lever 52 rotates reversely to reset through the spring force of the torsion spring 55 until the stop pin 80 abuts against the limiting block 90, the limiting block 90 limits the clutch lever 52 at the initial position, and then all the components in the thread trimming unit 40 reset. In addition, as shown in fig. 4, a forced return arm 521 is provided on the clutch lever 52; as shown in fig. 5, the clutch cam 51 is provided with a forced return convex portion 511; when the reset fault occurs after the thread trimming is finished, the cam lifter 32 and the clutch cam 51 rotate in the opposite direction along with the cam lifter thread trimming driving source 10 to drive the forced reset protrusion 511 to rotate in the opposite direction, the forced reset protrusion 511 gradually approaches the forced reset arm 521 on the clutch lever 52, the forced reset protrusion 511 abuts against the forced reset arm 521 to push the clutch lever 52 to rotate in the opposite direction for forced reset, and the fault that the driving knife 44 and the auxiliary knife 46 are clamped by the thread hairs and cannot be reset smoothly is avoided.

Feeding module 60

As shown in fig. 2 and 6, 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 articulator 20, the feed lifting thread trimming 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 comprises a feeding crank 62 driven by a feeding driving source 61 to rotate, a feeding connecting rod 63 and a tooth frame base 64 rotatably supported in a base plate of the modular sewing machine through a feeding shaft 65, wherein two ends of the feeding connecting rod 63 are respectively hinged with the feeding crank 62 and the tooth frame base 64, and the tooth frame base 64 is hinged with the feeding connecting part 22 of the tooth frame 20. When the modular sewing machine is used for sewing, the feeding driving source 61 swings back and forth within a certain angle range, the feed crank 62 and the feeding connecting rod 63 drive the tooth frame base 64 to swing back and forth in a reciprocating manner, and further the feeding connecting part 22 of the tooth frame 20 and the feed dog 70 are driven to move back and forth in a reciprocating manner, so that the feed dog 70 is driven to perform back and forth cloth feeding actions. The actual needle pitch is changed by controlling the swing amplitude of the feeding driving source 61, and the change of the motion tracks of various feed dogs 70, such as an elliptical motion track, a regular triangular motion track, an inverse triangular motion track and a rectangular motion track, is realized by controlling the time matching relationship between the feeding driving source 61 and the feed dog thread trimming driving source 10.

To sum up, the utility model discloses various shortcomings in the prior art have effectively been overcome and high industry value has.

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

Claims (11)

1. A lifting tooth thread trimming module for a modular sewing machine, characterized in that: the thread lifting and trimming driving source comprises a thread lifting and trimming driving source (10), a thread lifting unit (30) connected with a thread lifting connecting part (21) at one end of a thread frame (20), a trimming unit (40) and a clutch unit (50), wherein the thread lifting and trimming driving source (10) is independent of other driving sources in a modular sewing machine, and the output end of the thread lifting and trimming driving source (10) is connected with the thread lifting unit (30);

the clutch unit (50) comprises a clutch cam (51) driven by the tooth lifting and thread trimming driving source (10) to rotate, a clutch lever (52) with a fixed rotating fulcrum, a clutch ball (53) rotatably mounted on the clutch lever (52), and a clutch connecting rod (54) with one end hinged with the clutch lever (52), and the other end of the clutch connecting rod (54) is in transmission connection with the thread trimming unit (40);

the running range of the tooth lifting and thread cutting driving source (10) comprises a tooth lifting area and a thread cutting area which are mutually independent; when the tooth lifting thread trimming driving source (10) operates in a tooth lifting area, no power is transmitted between the clutch cam (51) and the clutch ball (53); when the tooth lifting thread trimming driving source (10) operates in a thread trimming area, power is transmitted between the clutch cam (51) and the clutch ball (53).

2. The tooth lifting thread trimming module of claim 1, wherein: the tooth lifting thread trimming driving source (10) is a motor, and the clutch cam (51) is fixed on a motor shaft of the tooth lifting thread trimming driving source (10).

3. The tooth lifting thread trimming module of claim 2, wherein: the feed lifting tooth unit (30) comprises a feed lifting tooth shaft (31) rotatably supported in a bottom plate of the modular sewing machine, a primary transmission assembly connected between a motor shaft of the feed lifting tooth thread trimming driving source (10) and the feed lifting tooth shaft (31), and a secondary transmission assembly connected between the feed lifting tooth shaft (31) and a feed lifting tooth connecting part (21) of the feed lifting tooth frame (20).

4. The tooth lifting thread trimming module according to claim 3, wherein: the primary transmission assembly comprises a tooth lifting eccentric wheel (32) fixed on a motor shaft of the tooth lifting trimming driving source (10), a primary tooth lifting connecting rod (33) and a primary tooth lifting crank (34) fixed on the tooth lifting shaft (31), one end of the primary tooth lifting connecting rod (33) is rotatably sleeved on an eccentric part of the tooth lifting eccentric wheel (32), and the other end of the primary tooth lifting connecting rod (33) is hinged with the primary tooth lifting crank (34).

5. The tooth lifting thread trimming module of claim 3, wherein: the two-stage transmission component comprises a two-stage feed lifting crank (35) fixed on the feed lifting shaft (31) and a two-stage feed lifting connecting rod (36), and two ends of the two-stage feed lifting connecting rod (36) are respectively hinged with the two-stage feed lifting crank (35) and a feed lifting connecting part (21) of the feed lifting frame (20).

6. The tooth lifting thread trimming module of claim 1, wherein: the trimming unit (40) comprises a trimming fork crank (41) with a fixed rotating fulcrum, a trimming connecting rod (42), a main knife rest (43), a driving knife (44) fixed on the main knife rest (43), an auxiliary knife rest (45), an auxiliary knife (46) fixed on the auxiliary knife rest (45) and a trimming transmission pin (47), wherein the trimming fork crank (41) is provided with a fork arm, the fork arm of the clutch connecting rod (54), the trimming fork crank (41) and the auxiliary knife rest (45) are coaxially hinged through the trimming transmission pin (47), the trimming transmission pin (47) is located in a fork of the fork arm and in sliding fit with the fork arm, and two ends of the trimming connecting rod (42) are respectively hinged with the trimming fork crank (41) and the main knife rest (43).

7. The tooth lifting thread trimming module of claim 1, wherein: the sewing machine is characterized by further comprising a torsion spring (55) sleeved at a fixed rotating fulcrum of the clutch lever (52), wherein two ends of the torsion spring (55) are connected with the clutch lever (52) and the bottom plate of the modularized sewing machine respectively.

8. The tooth lifting thread trimming module according to claim 1, wherein: the clutch lever (52) is provided with a forced reset arm (521), the clutch cam (51) is provided with a forced reset convex part (511), and the forced reset arm (521) can be abutted against the forced reset convex part (511).

9. The tooth lifting thread trimming module according to claim 1, wherein: when the feed lifting tooth thread trimming driving source (10) runs to the end point of the thread trimming area, the feed lifting tooth thread trimming driving source (10) prevents a feed dog (70) of the modular sewing machine from protruding out of a needle plate through a feed lifting tooth unit (30).

10. A modular sewing machine characterized by: the modular sewing machine is provided with the tooth-lifting thread-cutting module according to any one of claims 1 to 9.

11. The modular sewing machine of claim 10, wherein: still dispose feeding module (60) among the modularization sewing machine, feeding module (60) are including pay-off driving source (61) and the feeding unit who links to each other with pay-off connecting portion (22) at the other end of dental articulator (20), it is two independent driving sources mutually to raise tooth trimming driving source (10) and pay-off driving source (61), feeding unit includes by pay-off driving source (61) drive pivoted pay-off crank (62), pay-off connecting rod (63) and rotationally support dental articulator seat (64) in modularization sewing machine bottom plate, the both ends of pay-off connecting rod (63) are articulated with pay-off crank (62) and dental articulator seat (64) respectively, dental articulator seat (64) are articulated with pay-off connecting portion (22) of dental articulator (20).

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