WO2022206002A1

WO2022206002A1 - Fabric feeding module of sewing machine

Info

Publication number: WO2022206002A1
Application number: PCT/CN2021/135957
Authority: WO
Inventors: 郑吉�; 柯祥林; 祝书伟; 位延辉
Original assignee: 杰克科技股份有限公司
Priority date: 2021-04-02
Filing date: 2021-12-07
Publication date: 2022-10-06
Also published as: CN115182112B; CN115182112A

Abstract

The present invention provides a fabric feeding module of a sewing machine, the fabric feeding module being mounted on a lower side of a sewing table and comprising a tooth rack and fabric feeding teeth mounted on the tooth rack, and further comprising a fabric feeding structure for driving the fabric feeding teeth to move back and forth in a fabric feeding direction, and a tooth lifting structure for driving the fabric feeding teeth to move up and down, wherein the fabric feeding structure comprises a fabric feeding flexible assembly for providing a degree of freedom for a first fabric feeding swing rod during fabric feeding, and the tooth lifting structure comprises a tooth lifting flexible assembly for providing a degree of freedom for the first tooth lifting swing rod during fabric feeding. The fabric feeding module in the present invention is completely independent of a fabric pricking spindle of the sewing machine, such that the time sequence for the cloth feeding module can be freely adjusted relative to the cloth pricking time sequence for the spindle, and the problem in the prior art of limited adjustment of a fabric feeding time sequence is solved.

Description

A cloth feeding module of a sewing machine

technical field

The invention relates to a cloth feeding module of a sewing machine.

Background technique

At present, a cloth feeding mechanism is installed in the sewing machine, which is used to drive the cloth feeding dog to perform a compound movement of up and down reciprocating motion and back and forth reciprocating motion to realize cloth feeding. For the existing cloth feeding mechanism, please refer to a cloth feeding mechanism disclosed in the description of the Chinese invention patent application with the application number of 201810933691.9. Specifically, as shown in FIG. 1 , the cloth feeding mechanism includes a main motor, a main shaft 20 driven and rotated by the main motor, a cloth feeding assembly connected between the main shaft 20 and the front end of the tooth frame 30, a tooth lifting motor 50, and The tooth lift assembly between the tooth motor 50 and the rear end of the tooth frame 30 . The cloth feeding assembly includes a cloth feeding eccentric 62 fixed on the main shaft 20 by screws, a cloth feeding link 63, a cloth feeding swing seat 64 with a fixed swing fulcrum, a first swing plate 65, a second swing plate 66, a parallel On the feed shaft 61 of the main shaft 20, the feed crank 67 fixed on the right end of the feed shaft 61, and the bracket seat 68 fixed on the left end of the feed shaft 61, the upper end of the feed link 63 is rotatably mounted on the feed shaft 63. The outer circumference of the eccentric wheel 62, the lower end of the feed link 63, the rear end of the first swing plate 65, and the rear end of the second swing plate 66 are coaxially hinged, and the front end of the first swing plate 65 is connected to the cloth feed swing seat 64. Hinged, the front end of the second swinging plate 66 is hinged with the feed crank 67; the main motor drives the main shaft 20 to rotate, and the main shaft 20 drives the tooth frame 30 and the feed dog 40 fixed on the tooth frame 30 through the cloth feeding assembly to move forward and backward in the horizontal direction Reciprocating motion. The tooth-lifting assembly includes a tooth-lifting drive crank 82 fixed on the output shaft of the tooth-lifting motor 50, a tooth-lifting connecting rod 83, a tooth-lifting shaft 81 parallel to the main shaft 20, and a tooth-lifting crank 84 fixed on the right end of the tooth-lifting shaft 81. On the tooth-lifting swinging fork 85 at the left end of the tooth-lifting shaft 81 and the tooth-lifting slider 86 hinged with the rear end of the tooth frame 30 and slidingly matched with the tooth-lifting swing fork 85, the two ends of the tooth-lifting link 83 are respectively connected to the tooth-lifting drive The crank 82 is hinged with the tooth-lifting crank 84; the output shaft of the tooth-lifting motor 50 rotates, and the tooth-lifting assembly drives the tooth-rack 30 and the feeding dog 40 fixed on the tooth-rack 30 to reciprocate up and down in the vertical direction.

Under normal conditions, there is a phase difference ΔΦ between the X-direction movement of the feed dog in the horizontal direction and the Y-direction movement in the vertical direction. As shown in Figure 2, in the standard elliptical trajectory of the feed dog, The phase difference ΔΦ is about 90°. In addition, in the above-mentioned cloth feeding mechanism, changing the output rule of the tooth-lifting motor can change the feeding sequence, that is, within a certain range, the time t1 when the cloth feeding dog emerges from the needle plate and the time when the cloth feeding dog sinks under the needle plate can be adjusted. At time t2, the cloth feeding is advanced or delayed. However, since the feeding eccentric is fixed on the main shaft by screws, the position angle between the feeding eccentric part of the feeding eccentric that matches the feeding link and the main shaft is fixed, so that the horizontal direction of the feeding teeth is fixed. The horizontal displacement X remains unchanged. Therefore, in the process of fine-tuning the feeding timing, the numerical value of the phase difference ΔΦ will inevitably change, and the allowable range of the phase difference ΔΦ is -70°≦△Φ≦110°, so that the adjustment range of the feeding timing cannot be exceeded. large, otherwise it will cause the cloth to be dragged back. However, in the actual operation process, the fine-tuning of the feeding timing within a limited range obviously cannot meet all types of sewing needs.

SUMMARY OF THE INVENTION

In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a cloth feeding module that is completely independent from the main shaft of the sewing machine, so that the timing of the cloth feeding module is carried out relative to the main shaft. The timing of the thorn cloth can be adjusted freely.

In order to achieve the above purpose, the present invention provides a cloth feeding module of a sewing machine, which is installed on the lower side of the sewing table, and is characterized in that it includes a tooth frame and a cloth feeding dog installed on the tooth frame. A cloth feeding structure for the cloth feeding dog to move back and forth in the cloth feeding direction, and a tooth lifting structure for driving the cloth feeding dog to move up and down, the cloth feeding structure includes a first cloth feeding pendulum hinged on one end of the tooth frame, the The tooth-lifting structure includes a first tooth-lifting swing rod hinged at the other end of the tooth frame, the cloth-feeding structure includes a cloth-feeding flexible component for providing a degree of freedom for the first cloth-feeding swing-bar during the tooth-lifting process, and the The tooth structure includes a tooth-lifting flexible assembly for providing a degree of freedom for the first tooth-lifting pendulum during the cloth feeding process.

Further, the cloth feeding structure includes a cloth feeding driving source fixedly installed on the lower side of the sewing table, and the tooth-lifting structure includes a tooth-lifting driving source fixedly installed on the lower side of the sewing table.

Further, the cloth feeding structure includes a cloth feeding fulcrum that is completely controlled and moved by a cloth feeding driving source, one end of the cloth feeding flexible component is hinged with the cloth feeding fulcrum, and the other end is hinged with the tooth frame.

Further, a cloth feeding crank is installed on the cloth feeding drive source, a cloth feeding crank shaft is installed on the cloth feeding crank, and the cloth feeding crank shaft is the cloth feeding fulcrum.

Further, the cloth feeding flexible assembly includes a cloth feeding fixed shaft fixed on the lower side of the sewing table, the middle part of the first cloth feeding pendulum rod is rotatably connected to the cloth feeding fixed shaft, and one end of the first cloth feeding pendulum rod is rotatably connected to the cloth feeding fixed shaft. It is hinged with the tooth frame, and the other end is hinged with the second cloth feeding swing rod, one end of the second cloth feeding swing rod is hinged with the first cloth feeding swing rod, and the other end is hinged with the cloth feeding fulcrum.

Further, a waist circle groove is provided at the connection between the first cloth feeding pendulum rod and the second cloth feeding pendulum rod.

Further, the tooth-lifting structure includes a tooth-lifting fulcrum which is completely controlled and moved by the tooth-lifting drive source, one end of the tooth-lifting flexible component is hinged with the tooth-lifting fulcrum, and the other end is hinged with the tooth frame.

Further, a tooth-lifting shaft is installed on the tooth-lifting drive source, a tooth-lifting eccentric is installed on the tooth-lifting shaft, and the tooth-lifting eccentric is eccentrically fixedly connected with the tooth-lifting shaft; the tooth-lifting eccentric is The tooth-lifting fulcrum, the tooth-lifting flexible member includes the first tooth-lifting swing rod and the tooth-lifting eccentric bearing, the outer ring of the tooth-lifting eccentric bearing is connected with the first tooth-lifting swing rod, and the inner ring is connected to the first tooth-lifting swing rod. Connect with the tooth-lifting eccentric.

Further, a tooth-lifting structure fixing bracket and a cloth-feeding structure fixing bracket are fixedly installed on the lower side of the sewing table.

As mentioned above, the cloth feeding module of a sewing machine involved in the present invention has the following beneficial effects: (1) The cloth feeding module is completely independent of the cloth piercing main shaft of the sewing machine, so that the timing of the cloth feeding module is relative to the timing of the main shaft piercing the cloth. It can be adjusted freely; (2) The feeding structure and the tooth lifting structure are controlled by different motors, and the up and down movement and forward and backward movement of the feeding dog are respectively controlled, so that the movement trajectory of the feeding dog can be adjusted to adapt to different sewing (3) Through the cloth feeding flexible component and the tooth lifting flexible component, the cloth feeding movement and the tooth lifting movement will not affect each other, and the tooth lifting movement will not produce greater pressure on the cloth feeding structure, and the cloth feeding movement will not affect each other. Produces greater pressure on the tooth-lifting structure; (4) Through the position design of the cloth feeding fixed shaft, the movement trajectory of the cloth feeding dog can be more in line with the feeding requirements; (5) Through the first cloth feeding pendulum rod and the second feeding The adjustment at the waist circle groove at the connection of the cloth swing rod can fine-tune the initial angle and position of the feed dog.

Description of drawings

FIG. 1 is a schematic structural diagram of a cloth feeding structure of a sewing machine in the prior art.

FIG. 2 is a schematic structural diagram of a cloth feeding module.

FIG. 3 is a schematic structural diagram of the cloth feeding module after the sewing table is hidden.

FIG. 4 is a schematic structural diagram of a modular sewing machine without a casing and a sewing table.

FIG. 5 is a schematic structural diagram of a thorn cloth thread take-up module of a modular sewing machine.

FIG. 6 is a schematic structural diagram of an auxiliary function module of a modular sewing machine.

7a to 7d are schematic diagrams of a feeding track of a feeding dog.

Component label description

Cage 10, feed dog 20, needle bar thread take-up module 30, needle bar thread take-up drive source 31, needle bar 32, machine bar 33, thread take-up bar 34, upper shaft 35, needle bar crank 36, barbed fabric thread take-up Transmission shaft 37, cloth feeding structure 40, first cloth feeding swing rod 41, cloth feeding driving source 42, cloth feeding crank 43, cloth feeding fixed shaft 44, second cloth feeding swing rod 45, tooth lifting structure 50, first lifting Swing rod 51, tooth lift drive source 52, tooth lift shaft 53, tooth lift eccentric 54, auxiliary function module 60, thread trimmer 61, fixed knife 611, movable knife 612, presser foot lifter 62, presser foot 621, Thread trimming transmission mechanism 63, thread trimming cam 631, thread trimming roller 632, first thread trimming crank shaft 633, first thread trimming crank 634, thread trimming slider 635,

The second thread trimming crank shaft 636, the second thread trimming crank 637, the thread trimming link 638, the movable knife rest 639, the presser foot lifter mechanism 64, the presser foot lifter cam 641, the presser foot lifter roller 642, the presser foot lifter drive shaft 643, presser foot lifter crank 644, first pull rod 645, right lever 646, second pull rod 647, left lever 648, presser foot lifter plate 649, presser rod guide 6410, presser rod 6411, auxiliary drive source 65, sewing table 70, the tooth lifting structure fixing bracket 71, the cloth feeding structure fixing bracket 72.

Detailed ways

The embodiments of the present invention are described below by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

It should be noted that the structures, proportions, sizes, etc. drawn in the accompanying drawings of this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with the technology, and are not used to limit the conditions that the present invention can be implemented. Therefore, without technical substantive significance, any modification of structure, change of proportional relationship or adjustment of size should still fall within the scope disclosed in the present invention without affecting the effect that the present invention can produce and the purpose that can be achieved. within the scope of technical content. At the same time, the terms such as "up", "down", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the present invention. The practicable scope and the change or adjustment of the relative relationship thereof shall also be regarded as the practicable scope of the present invention without substantially changing the technical content.

Example 1

As shown in Figures 1-3, a cloth feeding module of a sewing machine is installed on the lower side of the sewing table, including a tooth frame 10, a cloth feeding dog 20 installed on the tooth frame, and a cloth feeding dog 20 for driving the cloth feeding dog in the feeding of the cloth. The cloth feeding structure 40 that moves back and forth in the feeding direction, and the lifting tooth structure 50 for driving the feeding dog 20 to move up and down, the cloth feeding structure 40 includes a first cloth feeding rocker 41 hinged on one end of the tooth frame. The tooth structure 50 includes a first tooth-lifting swing rod 51 hinged on the other end of the tooth frame 10 , and the cloth-feeding structure 40 includes a cloth-feeding flexible component for providing the first cloth-feeding swing-bar 41 with a degree of freedom during the tooth-lifting process , the tooth-lifting structure 50 includes a tooth-lifting flexible component for providing a degree of freedom for the first tooth-lifting pendulum rod 51 during the cloth feeding process. The cloth feeding structure includes a cloth feeding driving source 42 fixedly installed on the lower side of the sewing table 70 , and the tooth lifting structure 50 includes a tooth lifting driving source 52 fixedly installed on the lower side of the sewing table 70 . The cloth feeding structure 40 is completely independent of the sewing machine piercing main shaft, so that the timing of the cloth feeding module can be freely adjusted relative to the timing of the main shaft piercing the cloth; The structure 40 drives the feed dog 20 to move back and forth, and the tooth-lifting flexible component moves with the right end of the feed dog 20 to prevent the momentum of the forward and backward movement from being transmitted to the tooth-lifting structure 50; similarly, when the tooth-lifting structure 50 performs the tooth-lifting action When the tooth-lifting drive source 52 drives the cloth-feeding dog 20 to move up and down through the tooth-lifting structure 50, the cloth-feeding flexible component moves with the left end of the cloth-feeding dog 20 to prevent the power of the up-and-down movement from being transmitted to the cloth-feeding structure 40; Both the cloth drive source 42 and the tooth lift drive source 52 are motors.

Further, the cloth feeding structure 40 includes a cloth feeding fulcrum which is completely controlled and moved by the cloth feeding driving source 42. One end of the cloth feeding flexible component is hinged with the cloth feeding fulcrum, and the other end is hinged with the tooth frame 10. The cloth feeding A cloth feed crank 43 is installed on the drive source 42, and a cloth feed crank shaft is installed on the cloth feed crank 43, and the cloth feed crank shaft is the cloth feed fulcrum; when the cloth feed action stops, the cloth feed The fulcrum does not move. If the tooth lifting action is performed at this time, and the angle between the cloth feeding flexible component and the tooth frame 10 changes, the pressure on the cloth feeding fulcrum can be avoided, so that the cloth feeding driving source 42 will not generate a large amount of pressure. load.

The cloth-feeding flexible assembly includes a cloth-feeding fixed shaft 44 fixed on the lower side of the sewing table 70. The middle of the first cloth-feeding swing rod 41 is rotatably connected to the cloth-feeding fixed shaft 44. The first cloth-feeding swing rod One end of 41 is hinged with the tooth frame 10, and the other end is hinged with the second cloth feeding swing rod 45, one end of the second cloth feeding swing rod 45 is hinged with the first cloth feeding swing rod 41, and the other end is hinged with the cloth feeding fulcrum; the The connection between the first cloth feeding pendulum 41 and the second cloth feeding pendulum 45 is provided with a waist circle groove; the cloth feeding fixing shaft 44 divides the first cloth feeding pendulum 41 into an upper part and a lower part. When the length of the upper part of the swing rod 41 is closer to the length of the first tooth-lifting swing rod 51, the movement of the feed dog 20 is closer to translation. It is inconvenient to adjust, so the design of the fixed shaft 44 provides the possibility to adjust the length of the upper part of the first cloth feeding swing rod 41; through the position design of the cloth feeding fixed shaft 44, the movement trajectory of the feeding dog 20 can be more in line with the Feeding requirements: By adjusting the waist circle groove at the connection between the first cloth feeding swing rod 41 and the second cloth feeding swing rod 45, the initial angle and position of the cloth feeding dog can be fine-tuned.

When the cloth feeding drive source 42 is operating, the cloth feeding crank 43 rotates accordingly, thereby driving the second cloth feeding pendulum 45 to swing, and the second cloth feeding pendulum 45 drives the first cloth feeding pendulum 41 to swing. The fixed shaft swings as a rotating shaft, thereby driving the feeding dog 20 to move.

Further, the tooth-lifting structure 50 includes a tooth-lifting fulcrum that is completely controlled and moved by the tooth-lifting drive source 52, one end of the tooth-lifting flexible component is hinged with the tooth-lifting fulcrum, and the other end is hinged with the tooth-lifting frame 20; A tooth-lifting shaft 53 is installed on the drive source 52, and a tooth-lifting eccentric wheel 54 is installed on the tooth-lifting shaft 53, and the tooth-lifting eccentric wheel 54 is eccentrically fixedly connected with the tooth-lifting shaft 53; the tooth-lifting eccentric wheel 53 is The tooth-lifting fulcrum, the tooth-lifting flexible member includes the first tooth-lifting swing rod 51 and the tooth-lifting eccentric bearing, the outer ring of the tooth-lifting eccentric bearing is connected with the first tooth-lifting swing rod 51, The inner ring is connected with the tooth-lifting eccentric wheel 54; when the tooth-lifting drive source 52 operates, the tooth-lifting shaft 53 is driven along with the tooth-lifting eccentric wheel 54 to rotate eccentrically, thereby driving the feeding dog 20 to move up and down.

Further, a tooth-lifting structure fixing bracket 71 and a cloth-feeding structure fixing bracket 72 are fixedly installed on the lower side of the sewing table 70, and the tooth-lifting structure fixing bracket 71 includes a tooth-lifting bearing seat and a tooth-lifting drive source mounting seat; the The cloth-feeding structure fixing bracket 72 includes a cloth-feeding drive source mounting seat.

A modular sewing machine using the above-mentioned cloth feeding module, further comprising a thorn cloth thread take-up module 30, and the thorn cloth thread take-up transmission mechanism includes an upper shaft 35 driven and rotated by a thorn cloth thread take-up drive source 31, and fixed on the upper shaft 35. The needle bar crank 36 at the left end, the thorn cloth thread take-up drive shaft 37, the connecting rod mechanism, and the crank slider mechanism, the upper shaft 35 extends left and right, and the right end of the upper shaft 35 and the thorn cloth thread take-up drive source 31 The motor shaft passes through the coupling shaft The thorn cloth take-up transmission shaft 37 has a first shaft portion eccentric to the upper shaft 35, and a second shaft portion eccentric to the first shaft portion, the second shaft portion is also eccentric to the upper shaft 35, the first shaft portion The shaft portion is fixed to the needle bar crank 36, and is connected to the thread take-up lever 34 through a connecting rod mechanism, and the second shaft portion is connected to the needle bar 32 through a crank-slider mechanism. The thorn cloth thread take-up drive source 31 drives the upper shaft 35 to rotate, the upper shaft 35 drives the needle bar crank 36 and the thorn cloth thread take-up transmission shaft 37 to rotate together around the central axis of the upper shaft 35, and the thorn cloth thread take-up transmission shaft 37 passes through the link mechanism. The thread take-up lever 34 is driven to reciprocate up and down to perform the thread take-up action. The thread take-up drive shaft 37 drives the needle bar 32 to reciprocate up and down through the crank-slider mechanism.

A modular sewing machine using the above-mentioned cloth feeding module further includes a thread trimming part 61 and a presser foot lifting part 62 .

The thread trimming part 61 includes a fixed knife 611 and a rotatable movable knife 612. The thread trimming transmission mechanism 63 includes a thread trimming cam 631, a thread trimming roller 632, a thread trimming cam 631 fixed on the left motor shaft of the auxiliary drive source 65, A first thread trimming crank shaft 633 rotatably supported in the sewing machine casing and extending left and right, a first thread trimming crank 634 fixed on the left end of the first thread trimming crank shaft 633, a thread trimming slider 635, and rotatably supported on the sewing machine The second thread trimming crank shaft 636 in the casing and extending left and right, the second thread trimming crank 637 fixed on the left end of the second thread trimming crank shaft 636, the thread trimming link 638, and the moving tool holder 639, the first thread trimming crank The right end of the shaft 633 is integrally extended with a first thread trimming drive arm, the thread trimming roller 632 is rotatably mounted on the first thread trimming drive arm, and is in contact with the thread trimming cam 631, and the right end of the second thread trimming crank shaft 636 A second thread trimming drive arm is integrally extended, and the thread trimming slider 635 is hinged with the first thread trimming crank 634 and slidably matched with the thread trimming chute extending left and right in the second thread trimming drive arm. The two ends are respectively hinged with the second thread trimming crank 637 and the movable knife rest 639 , and the movable knife 612 is fixed on the movable knife rest 639 . In addition, the contour surface on the thread trimming cam 631 that is in contact with the thread trimming roller 632 includes a first variable diameter driving segment and a first escape segment, and the first escape segment may be an equal diameter surface.

The presser foot lifter 62 includes a presser foot 621 that can move up and down, and the presser foot lifter mechanism 64 includes a presser foot lifter cam 641 fixed on the right motor shaft of the auxiliary drive source 65, a presser foot lifter roller 642, rotatably supported on the The presser foot lifter drive shaft 643 in the sewing machine casing and extending left and right, the presser foot lifter crank 644 fixed on the right end of the presser foot lifter drive shaft 643, the first pull rod 645 extending up and down, the right lever 646 with the first fixed swing fulcrum, The second pull rod 647 extending left and right, the left lever 648 with the second fixed swing fulcrum, the presser foot lifter plate 649, the presser rod guide 6410, and the up and down extending presser rod 6411, the left end of the presser foot lifter drive shaft 643 integrally extends There is a presser foot lifter drive arm, and the presser foot lifter roller 642 is rotatably mounted on the presser foot lifter drive arm, and is in contact with the presser foot lifter cam 641. The right lever 646 is hinged, the two ends of the second pull rod 647 are hinged with the right lever 646 and the left lever 648 respectively, the left lever 648 is hinged with the upper end of the presser foot lifting plate 649, and the presser foot lifting plate 649 is provided with a lifting hook. The pressure rod guide frame 6410 is provided with a connecting protrusion that engages with the lifting hook. In addition, the contoured surface on the presser foot lifter cam 641 that contacts and cooperates with the presser foot lifter roller 642 includes a second diameter reducing drive section and a second avoidance section, and the second avoidance section may be a groove.

When the auxiliary function module 60 performs the thread trimming action, the auxiliary driving source 65 acts to drive the thread trimming cam 631 and the presser foot lifter cam 641 to rotate together; the first variable diameter drive section on the thread trimming cam 631 is in contact with the thread trimming roller 632 , push the first thread trimming crank shaft 633 to swing, and then push the second thread trimming crank shaft 636 to swing through the first thread trimming crank 634 and thread trimming slider 635, and then drive the second thread trimming crank 637 and thread trimming link 638 to swing. The movable knife holder 639 and the movable knife 612 rotate, so that the movable knife 612 rotates in the direction close to the fixed knife 611, the movable knife 612 and the fixed knife 611 are engaged, and the suture is cut, thereby performing the thread trimming action; The second avoidance section on the foot cam 641 cooperates with the presser foot lifter roller 642, and will not push the presser foot lifter drive shaft 643 to swing, so the presser foot 621 will not be lifted upwards, thus avoiding the need for the presser foot lifter mechanism. 64 cause interference.

In the above modular sewing machine, by adjusting the relative timing between the driving source for feeding the cloth and the driving source for taking up the thread for thorn cloth, it is possible to adjust the timing of the hooking of the hook relative to the needle 33 in the morning and evening. The hooking time of the material is late. The feed dog 20 performs a compound motion of up and down reciprocating movement and back and forth reciprocating movement. By adjusting the output rule of the cloth feed drive source 51 relative to the tooth lift and hook thread drive source 41, the feed track of the feed dog 20 can be changed. For example, the following can be achieved: The elliptical feed track shown in Fig. 7a, the front triangular feed track shown in Fig. 7b, the rear triangle feed track shown in Fig. 7c, or the rectangular feed track shown in Fig. 7d, wherein , the oval feed track and the front triangle feed track are suitable for the sewing of thin and medium-heavy materials, the rear triangle feed track and the rectangular feed track are suitable for the sewing of heavy materials

Claims

A cloth feeding module of a sewing machine, which is installed on the lower side of the sewing table, is characterized in that it includes a tooth frame and a cloth feeding dog installed on the tooth frame, and is characterized in that it also includes a cloth feeding dog for driving the cloth feeding dog in the cloth feeding direction. A cloth feeding structure that moves back and forth, and a tooth lifting structure used to drive the feeding dog to move up and down, the cloth feeding structure includes a first cloth feeding pendulum hinged on one end of the tooth frame, and the tooth lifting structure includes a first cloth feeding pendulum hinged on the tooth frame. The first tooth-lifting pendulum rod at the other end, the cloth-feeding structure includes a cloth-feeding flexible component for providing the first cloth-feeding pendulum rod with a degree of freedom during the tooth-lifting process, and the tooth-lifting structure includes a cloth-feeding flexible component for feeding the cloth A tooth-lifting flexible component that provides a degree of freedom for the first tooth-lifting swing rod during the process.
The cloth feeding module of a sewing machine according to claim 1, wherein the cloth feeding structure comprises a cloth feeding driving source fixedly installed on the lower side of the sewing table, and the tooth lifting structure comprises a cloth feeding driving source fixedly installed under the sewing table side tooth lift drive source.
The cloth feeding module of a sewing machine according to claim 2, wherein the cloth feeding structure comprises a cloth feeding fulcrum which is completely controlled and moved by a cloth feeding driving source, and one end of the cloth feeding flexible component is connected to the cloth feeding fulcrum. Hinged, and the other end is hinged to the bracket.
A cloth feeding module of a sewing machine according to claim 3, wherein a cloth feeding crank is installed on the cloth feeding driving source, a cloth feeding crank shaft is installed on the cloth feeding crank, and the cloth feeding crank The axis is the said feed fulcrum.
The cloth feeding module of a sewing machine according to claim 3, wherein the cloth feeding flexible assembly comprises a cloth feeding fixed shaft fixed on the lower side of the sewing table, and the middle part of the first cloth feeding rocker is rotatably connected On the cloth feeding fixed shaft, one end of the first cloth feeding pendulum is hinged with the tooth frame, and the other end is hinged with the second cloth feeding pendulum, and one end of the second cloth feeding pendulum is hinged with the first cloth feeding pendulum, The other end is hinged to the feed fulcrum.
The cloth feeding module of a sewing machine according to claim 5, wherein a waist groove is provided at the connection between the first cloth feeding swing rod and the second cloth feeding swing rod.
The cloth feeding module of a sewing machine according to claim 2, wherein the tooth-lifting structure comprises a tooth-lifting fulcrum that is completely controlled and moved by a tooth-lifting drive source, and one end of the tooth-lifting flexible component is connected to the tooth-lifting fulcrum. Hinged, and the other end is hinged to the bracket.
The cloth feeding module of a sewing machine according to claim 6, wherein a tooth-lifting shaft is installed on the tooth-lifting drive source, a tooth-lifting eccentric wheel is installed on the tooth-lifting shaft, and the tooth-lifting eccentric The wheel is eccentrically and fixedly connected to the tooth-lifting shaft; the tooth-lifting eccentric wheel is the tooth-lifting fulcrum, and the tooth-lifting flexible member includes the first tooth-lifting swing rod and the tooth-lifting eccentric bearing, the tooth-lifting eccentric The outer ring of the wheel bearing is connected with the first tooth-lifting swing rod, and the inner ring is connected with the tooth-lifting eccentric.
A cloth feeding module of a sewing machine according to any one of claims 2 to 8, characterized in that a tooth-lifting structure fixing bracket and a cloth-feeding structure fixing bracket are fixedly installed on the lower side of the sewing table.