CN210684145U

CN210684145U - Thick material synchronous machine

Info

Publication number: CN210684145U
Application number: CN201921121900.6U
Authority: CN
Inventors: 沈益男; 鲁亚东; 阮勤波; 朱金聪; 金丰东
Original assignee: Jack Sewing Machine Co Ltd
Current assignee: Jack Technology Co Ltd
Priority date: 2019-07-17
Filing date: 2019-07-17
Publication date: 2020-06-05
Anticipated expiration: 2029-07-17

Abstract

The utility model provides a thick material synchronous machine is equipped with in the below of thick material synchronous machine seam material platform: the thread cutting system is used for finishing thread cutting after sewing is finished; the close sewing system is used for controlling the stitch length to be reduced before thread trimming, and a driving piece in the close sewing system is in transmission connection with a stitch length adjusting crank of the sewing machine through a transmission mechanism; the oil pump system is used for supplying oil to the thick material synchronous machine; in the length direction of the sewing platform, the close sewing system and the oil pump system are arranged on one side of the sewing platform, the thread cutting system is arranged on the other side of the sewing platform, and the driving piece and the needle pitch adjusting crank in the close sewing system are respectively positioned on two opposite sides of the oil pump system. The utility model discloses a overall arrangement trimming system, close system of sewing and oil pump system to this has simplified whole close system of sewing, and has made it close stitch gauge needle of control accurately, reaches the stub bar length when further shortening the trimming.

Description

Thick material synchronous machine

Technical Field

The utility model relates to a sewing machine technical field especially relates to a thick material synchronous machine.

Background

When the sewing machine finishes sewing, the stitch length can not be adjusted, the upper thread and the bottom thread can not form self-locking in the last stitch length, and two thread ends, one long and one short, can be formed at the sewing material after thread cutting, so that the appearance effect is influenced. Meanwhile, the thread end of the thread after thread cutting is too long, a procedure needs to be added, and a worker carries out manual treatment, so that the actual use effect is achieved.

Increase the first process of thread trimming and lead to production efficiency to reduce, need artifical pruning simultaneously, probably lead to two seam ends or the suture end length on the different sewing materials to differ, influence the outward appearance effect of in-service use. The thick material synchronous machine used in the existing market basically has no function of the closed seam short thread head, the problem is improved and upgraded, the function of the closed seam short thread head is increased, the length of the thread head after the sewing operation is finished meets the actual use requirement, and the aim of not needing manual trimming is fulfilled.

In the prior art, for example, in patent CN206580985U, a driver is used to push a connecting rod, the connecting rod swings to drive an idle stroke connecting rod, and the other end of the idle stroke connecting rod is connected to an automatic material reversing and feeding crank to drive the automatic material reversing and feeding crank to move, so as to drive a needle pitch adjusting device, so that the needle pitch is changed to achieve the needle density effect.

As chinese patent 201910003965.9 discloses a sewing machine's actuating mechanism, relates to the sewing machine field, including the backstitch electromagnet and set up backstitch electromagnet core on the backstitch electromagnet still includes the close seam electromagnet and sets up the last close seam electromagnet core of close seam electromagnet, the motion stroke of close seam electromagnet core is less than the motion stroke of backstitch electromagnet core, sewing machine is when the trimming, close seam electromagnet core drives through the connection structure between its power take off end and the power input end of backstitch electromagnet core the motion of backstitch electromagnet core.

The two patents adopt the control automatic material reversing and feeding crank to realize the close seam execution, so the control automatic material reversing and feeding crank needs to be related to an automatic material reversing and feeding mechanism, has a complex structure and is difficult to accurately control the needle pitch.

SUMMERY OF THE UTILITY MODEL

In view of the above shortcomings of the prior art, an object of the present invention is to provide a thick material synchronous machine for solving the problems of complicated structure and difficulty in precise control of the seam sealing mechanism added in the prior art.

In order to achieve the above objects and other related objects, the utility model provides a thick material synchronous machine is equipped with in the below of thick material synchronous machine sewing platform: the thread cutting system is used for finishing thread cutting after sewing is finished;

the close sewing system is used for controlling the stitch length to be reduced before thread trimming, and a driving piece in the close sewing system is in transmission connection with a stitch length adjusting crank of the sewing machine through a transmission mechanism; and

the oil pump system is used for supplying oil to the thick material synchronous machine;

in the length direction of the sewing platform, the close sewing system and the oil pump system are arranged on one side of the sewing platform, the thread cutting system is arranged on the other side of the sewing platform, and the driving piece and the needle pitch adjusting crank in the close sewing system are respectively positioned on two opposite sides of the oil pump system.

Preferably, the transmission mechanism includes: the transition piece is rotationally arranged and provided with a yielding part yielding the oil pump system, the transition piece is connected with the driving rod on the driving piece in a sliding way, and the transition piece is connected with the reset spring;

one end of the transmission component is connected with the transition piece, and the other end of the transmission component is connected with a needle pitch adjusting crank of the sewing machine;

the driving piece drives the needle pitch adjusting crank to act through the transition piece and the transmission assembly, and then the needle pitch is adjusted to be the dense sewing needle pitch.

Preferably, the transition piece is a bending piece with two bent arms, the yielding portion is enclosed between the two bent arms, the connecting portion between the two bent arms is connected with the driving rod in a sliding mode, the end portion of one bent arm is located in a rotating mode, and the end portion of the other bent arm is connected with the transmission assembly.

Preferably, the mode that the transition piece is connected with the driving rod in a sliding mode is as follows: the transition piece is provided with a sliding groove, and the driving rod is connected with the transition piece through a sliding piece arranged in the sliding groove.

Preferably, the transmission assembly is a double-ball-head connecting rod assembly, the double-ball-head connecting rod assembly comprises a rod body, a first ball head and a second ball head, and the length of the rod body is adjustable; the first ball head connects the rod body with the needle pitch adjusting crank, and the second ball head connects the rod body with the driving rod.

Preferably, the shaft comprises three sections, and the first section and the second section are respectively connected with the middle section through threads.

Preferably, the direction of the thread connecting the first section and the middle section is opposite to the direction of the thread connecting the second section and the middle section.

Preferably, the thread trimming system includes: a trimming driving member;

the wire cutting mechanism is characterized in that a wire cutting shaft in the wire cutting mechanism is provided with a crank assembly which axially slides and is circumferentially positioned and matched with the wire cutting shaft, and a reset assembly for resetting the crank assembly;

the cam is fixed on the lower shaft of the sewing machine and rotates along with the lower shaft, a driving groove matched with the crank assembly is formed in the cam, the crank assembly and the cam are in a separated or locked state under the action of the thread trimming driving piece and the reset assembly, and when the crank assembly and the cam are in a locked state, the cam drives the thread trimming shaft to swing through the crank assembly, so that the thread trimming mechanism is driven to act to complete thread trimming.

Preferably, one side of the shear line shaft is provided with a limiting assembly, the limiting assembly comprises a limiting block fixed on the shear line shaft and a fixedly arranged cushion pad, and the cushion pad is positioned on the swing stroke of the limiting block and used for stopping the limiting block.

Preferably, the thread cutting driving piece and the driving piece in the close sewing system are arranged along the width direction of the sewing platform. As above, the utility model discloses a synchronous machine of thick material has following beneficial effect: keep the distribution of the oil pump system among the current sewing machine, only do the change in the distribution to the trimming system, increase the close system of sewing simultaneously to this structure of simplifying close system of sewing, and realize carrying out a small segment close seam or variable gauge needle sewing before the trimming, make the back end of a thread of trimming shorten, the end of a thread firm in connection who leaves is difficult for droing after dragging, has improved the sewing effect, has increased pleasing to the eye degree.

Drawings

Fig. 1 is a schematic plan view of an automatic seam sealing mechanism and a thread trimming system of the thick material synchronous machine of the present invention.

Fig. 2 is a perspective view of the automatic seam sealing mechanism and the thread trimming system of the thick material synchronous machine of the present invention.

Fig. 3 is a schematic view of the double-ball-head connecting rod assembly in the automatic seam sealing mechanism of the present invention.

Fig. 4 shows a schematic diagram of the automatic seam sealing mechanism and the oil pump system of the present invention.

FIG. 5 is a schematic view showing the length of the bobbin thread end of the prior art sewing machine after thread trimming.

Fig. 6 shows the length of the bottom thread end of the medium-thickness material synchronous machine after thread trimming according to the present invention.

Fig. 7 is a schematic view of the thread trimming system of the present invention.

Fig. 8 is a schematic diagram of the position limitation of the shear line shaft according to the present invention.

Description of the element reference numerals

1 cam

2 set screw

3 driving member

4 drive rod

5 reset spring

6 oil pipe

7 sliding part

8 transition piece

81. 82 bent arm

83 sliding groove

9-axis screw

10 drive assembly

101 first ball head

102 second segment

103 middle section

104 first stage

105. 106 lock nut

107 second ball head

11 oil pump assembly

12-stitch-length adjusting crank

13 loose wire support

14 trimming driving piece

15 pushing plate

16 loose wire steel rope pressure plate

17 first crank

18 second crank

19 limiting bracket

20 spring

21 limiting block

22 tool rest return spring

23-shear line driving crank

24 oil applying pipe

25 buffer cushion

26 shear line axle

27 screw

28 nut

100 tight seam system

200 oil pump system

300 thread trimming system

601 spindle

602 tooth lifting connecting rod

603 feeding connecting rod

604 lower shaft

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.

Please refer to fig. 1 to 8. It should be understood that the structures, ratios, sizes, etc. shown in the drawings of the present specification are only used for matching with the contents disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any modification of the structures, changes of the ratio relationship, or adjustment of the sizes should still fall within the scope covered by the technical contents disclosed in the present invention without affecting the efficacy and the achievable purpose of the present invention. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" 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 made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.

As shown in fig. 1 and 2, the utility model provides a sewing machine, in particular to a thick material synchronous machine, which comprises a main shaft 601, a lower shaft 604, a feeding component and a feed lifting tooth component, wherein the feeding component comprises a feeding connecting rod 603 and a feeding swinging seat, the feed lifting tooth component comprises a feed lifting tooth connecting rod 602 and a feed lifting tooth crank, and the feeding connecting rod 603 and the feed lifting tooth connecting rod 602 are matched with a feeding feed lifting tooth wheel on the main shaft 601, so as to drive the feed lifting tooth to complete horizontal movement and up-and-down movement to realize feeding; a thread cutting system 300, a close-stitch system 100 and an oil pump system 200 for supplying oil to a thick material synchronous machine are further arranged below the sewing platform of the sewing machine, the thread cutting system 300 is used for finishing thread cutting after sewing is finished, and the close-stitch system 100 is used for realizing sewing in which the stitch length is controlled to be reduced and is close to zero before thread cutting so that the thread cutting forms a short thread head; the oil pump system 300 supplies oil to the main shaft 601 and the lower shaft 604 through the upper oil pipe 24 and the lower oil pipe 6. The utility model discloses a sewing machine it has current sewing machine's basic mechanism, and this specification mainly describes its mechanism different with current sewing machine, mainly relates to trimming system 300 and close seam system 100.

For convenience of description, the cloth feeding direction in sewing is referred to as a front-back direction in this specification, that is, a width direction of a sewing table of a sewing machine is referred to as a front-back direction; the length direction of the sewing platform is set as the left-right direction, wherein one side corresponding to the needle is the left side of the sewing platform, and the other side is the right side.

In order to make the mechanisms disposed under the sewing platform of the sewing machine reasonable, the thread trimming system 300 is disposed as close to the left side of the sewing platform as possible, and the close-sewing system 100 and the oil pump system 200 are disposed at the right side of the sewing platform in the present embodiment. That is, the distribution of the oil pump system 200 in the existing sewing machine can be maintained, and only the structure and the distribution of the thread trimming system 300 are changed; while adding a closed seam system 100. The oil pump system 200 in the present embodiment includes an oil pump assembly 11, and an upper oil pipe 24 and a lower oil pipe 6 connected to a main shaft 601 and a lower shaft 604.

The utility model provides an automatic close seam mechanism, it is shown to suddenly 3 to see figure 1, automatic close seam mechanism fixes the bottom surface at above-mentioned sewing machine sewing platform, automatic close seam mechanism (being above-mentioned close seam system 100) includes:

a driving piece 3 with a driving rod 4, wherein the driving piece 3 is fixed on the sewing platform; the driving piece 3 and a needle pitch adjusting crank 12 of the sewing machine (the needle pitch adjusting crank 12 is connected with the feeding swing seat) are respectively positioned at two opposite sides of the oil pump system 200;

the transition piece 8 is rotatably arranged and provided with a yielding part yielding the oil pump system 200, the transition piece 8 is connected with the driving rod 4 in a sliding manner, and the transition piece 8 is connected with the return spring 5;

one end of the transmission component 10 is connected with the transition piece 8, and the other end of the transmission component 10 is connected with a needle pitch adjusting crank 12 of the sewing machine; the transmission assembly 10 and the needle pitch adjusting crank 12 of the embodiment are positioned on the same side of the oil pump system 200;

the driving part 3 drives the needle pitch adjusting crank 12 to act through the transmission mechanism, namely the transition part 8 and the transmission assembly 10, and then the needle pitch is adjusted to be the tight seam needle pitch.

The driving piece 3 and the needle pitch adjusting crank 12 of the sewing machine (the needle pitch adjusting crank 12 is connected with the feeding swing seat) are respectively arranged at two opposite sides of the oil pump system 200, so that the close sewing system 100 and the oil pump system 200 can be intensively distributed at the right side of the sewing platform, and the structure and the position of the existing oil pump system 200 can be unchanged; in addition, the needle pitch adjusting crank 12 is directly driven to act through the driving piece 3, the needle pitch is adjusted to the stitch pitch of the dense sewing, the stitch pitch is not required to be combined with a backstitch crank or a backstitch electromagnet in a backstitch mechanism, the whole automatic dense sewing mechanism is simplified, the dense sewing needle pitch can be accurately controlled, and the short thread end length during thread cutting is further shortened.

In this embodiment, the needle pitch adjusting crank 12 is directly driven by the driving member 3 to swing the needle pitch adjusting crank 12, and the needle pitch is close to the zero position for sewing, and the number of sewing needles is set by the controller. Referring to fig. 5, the stitch length before trimming and the length of the formed thread end are not increased before the automatic seam sealing mechanism of the embodiment, and the length of the bottom thread after trimming is L1: a + B + C, A, B is the length of the normal sewing needle pitch, C is the designed avoidance length before thread trimming; referring to fig. 6, the stitch length and the length of the formed thread end after the automatic seam sealing mechanism of the embodiment is increased and before thread cutting are performed, and the length of the bottom thread after thread cutting is L2: d + C, wherein D is the length value of the closely-spaced stitch length and the size of D is about 0-0.5 mm. As can be seen from the figures 5 and 6, the automatic close sewing mechanism and the sewing machine of the utility model have the advantages that the length of the bottom thread is shorter after the thread is cut, and the last needle or needles formed by the last close sewing needle pitch make the sewing stable and not easy to thread off.

In order to realize automatic seam sealing, the driving member 3 is a driving electromagnet, and can adopt parts such as an air cylinder, a driving motor and the like. The driving part 3 is controlled by a controller of the sewing machine, when thread cutting is needed, the driving part 3 acts to execute the stitch length of the tight sewing, then the thread is cut, and the driving part 3 stops after the thread cutting is finished, so that the length of the thread end of the bottom thread after the thread cutting is ensured to be short. In this embodiment, the sewing platform is provided with a waist-shaped slot, and the driving member 3 is mounted in the waist-shaped slot by a set screw 2. On one hand, the processing precision of the sewing platform can be reduced, and the assembly is easier; on the other hand, the installation position of the driving electromagnet can be finely adjusted, so that the stroke of the electromagnet is increased or reduced, and the effect of the seam sealing short thread end is better.

For better arrangement, the transition piece 8 in this embodiment is a bent piece having two

bent arms

81 and 82, as shown in fig. 3 and 4, the two

bent arms

81 and 82 define the relief portion therebetween, the connection portion between the two bent arms is slidably connected to the driving rod 4, the end portion of one bent arm 81 is rotatably positioned, and the end portion of the other bent arm 82 is connected to the transmission assembly 10. In the embodiment, the yielding part is formed by bending the bending piece, so that the upper oil pipe 24 in the oil pump system 200 can pass through the yielding part; in addition, the transition piece 8 can be horizontally pulled to rotate through the driving rod 4 in the rotating arrangement, and then the transmission assembly 10 is pulled to enable the needle pitch adjusting crank 12 to swing up and down, so that the needle pitch is adjusted to the tight seam needle pitch.

The above-mentioned structure of the transition piece 8 is not limited to this, and it may be in other forms, as long as it can avoid the oil feeding pipe 24 and the oil pump assembly 11, and realize the transmission of the power of the driving rod 4 to the transmission assembly 10.

The manner of slidably connecting the transition piece 8 to the driving rod 4 in this embodiment is as follows: the transition piece 8 is provided with a sliding groove 83, and the driving rod 4 is connected with the transition piece 8 through a sliding piece 7 arranged in the sliding groove 83. In this embodiment, the sliding groove 83 is arranged to realize the idle stroke of the transition piece 8, that is, when the backstitch electromagnet in the sewing machine works, because the rotation angle of the needle pitch adjusting crank 12 is increased, the counterclockwise rotation angle of the transition piece 8 is also increased through the mutual linkage action of the transmission component 10 and other parts, and at the moment, the sliding groove 83 of the transition piece 8 has a section of idle stroke, so as to satisfy the working state. In the present embodiment, the swing path of the transition piece 8 is circular arc, and therefore the outer shape of the slide groove 83 is circular arc, so that the force applied to the slider 7 during rotation is reduced.

One end of the return spring 5 is fixedly connected with the sliding part 7, and the other end can be fixedly connected with the driving part 3.

The transmission assembly 10 is a dual ball joint linkage assembly in this embodiment. As shown in fig. 3, the double-ball connecting rod assembly comprises a rod body, a first ball head 101 and a second ball head 107, wherein the length of the rod body is adjustable; a first ball head 101 connects the shaft to the needle pitch crank 12 by means of a shaft screw 9, and a second ball head 107 connects the shaft to the drive shaft 4 by means of a shaft screw 9. In the embodiment, the double-ball-head connecting rod assembly is matched with the transition piece 8 and the needle pitch adjusting crank 12, so that the change of the connecting direction is realized.

The above-mentioned transmission assembly 10 is not limited to this, and it can be a connecting rod with connecting holes on both ends with vertical axes, and it only needs to connect the transition piece 8 and the needle pitch adjusting crank 12.

In order to adjust the stitch length of the caulking joint, the shaft body in the embodiment comprises three sections, and the first section 104 and the second section 102 are respectively connected with the middle section 103 through threads. Through threaded connection, the lengthening and shortening of the rod body can be realized. In order to ensure that the connection is stable, the thread direction of the first section 104 connected with the middle section 103 is opposite to the thread direction of the second section 102 connected with the middle section 103; and locking

nuts

105 and 106 are arranged at the connection parts.

When the driving part 3 works, the transition part 8 swings horizontally, the transmission assembly 10 transmits the transmission, and the needle pitch adjusting crank 12 swings vertically, as shown in fig. 3. When the second section 102 receives a vertical force and the first section 104 receives a horizontal force, the first ball 101 and the shaft screw 9, and the second ball 107 and the shaft screw 9 are designed to reduce the component force generated by the rotation of the shaft. The first section 104 is designed by left-handed threads, the second section 102 is designed by right-handed threads, and locking is performed by a locking nut, so that the purpose of preventing looseness is achieved. Meanwhile, the middle section 103 is matched with the first section 104 and the second section 102, the length of the assembly can be adjusted, and the swing angle of the needle pitch adjusting crank 12 is adjusted so as to change the size of the needle pitch of the closed stitch.

The action process of the automatic seam sealing mechanism in the embodiment is as follows:

when a thread cutting instruction is obtained, the driving piece 3 is started, if the driving piece 3 drives the electromagnet, the driving piece attracts and closes to drive the driving rod 4 to move, the transition piece 8 is pushed to rotate in the moving process, after the transition piece rotates to a certain angle, the other end of the transition piece 8 drives the transmission component 10 to act, the transmission component 10 drives the needle pitch adjusting crank 12 to act, the stitch length is controlled by the controller, the later stitch length is changed into a preset small stitch length (any value including zero stitch length or negative value, namely reverse sewing) when the driving piece 3 is installed, at the moment, the controller controls the driving piece 3 to keep acting, so that the sewing machine moves for a set number of stitches under the small stitch length, after the set number of stitches is finished, the controller controls the thread cutting driving part in the thread cutting system 300 to work, so that the thread cutting effect is achieved, after the thread cutting is finished, the controller controls the driving part 3 to cancel the action, and the transition part 8 automatically resets under the action of the reset spring 5. In addition, the action of the controller controlling the driving piece 3 can be cancelled after the sewing machine finishes the set needle number and before the controller controls the thread cutting driving piece to work.

As an embodiment of the above thread trimming system 300:

the thread cutting system 300 of the present embodiment is installed in the left space of the bottom of the sewing platform, as shown in fig. 1 and 7, and is adjacent to the thread releasing cable pressing plate 16 and the thread releasing bracket 13 of the thread releasing mechanism, and comprises:

the trimming driving part 14, a pushing plate 15 which is connected with the trimming driving part 14 in a transmission way;

the thread cutting mechanism comprises a thread cutting shaft 26, a thread cutting driving crank 23 connected with the thread cutting shaft 26, a thread cutting knife rest and the like, the thread cutting mechanism can adopt any mechanism capable of realizing the thread cutting function in the prior art, only a mechanism for driving the thread cutting shaft to swing is described, and the mechanism for realizing the thread cutting action is not detailed; a crank component which axially slides and is circumferentially positioned and matched with the shear line shaft 26 and a reset component for resetting the crank component are arranged on the shear line shaft 26;

the cam 1 is fixed on the lower shaft 604, a driving groove is arranged on the cam part of the cam 1, a pin shaft capable of being inserted into the driving groove is arranged on the crank component, the crank component and the cam are in a separation and locking state under the action of the trimming driving piece and the reset component, when the trimming driving piece 14 acts, the pushing plate 15 is driven to act, so that the crank component slides to the cam 1 along the trimming shaft 16 and compresses the reset component, finally, the pin shaft on the crank component is inserted into the driving groove of the cam 1, so that the crank component and the cam are in a locking state, the cam 1 rotates along with the lower shaft 604, the crank component drives the trimming shaft 26 to swing, and the trimming mechanism is also driven to act to realize trimming. The thread trimming driving member 14 and the driving member 3 of the closed sewing system 100 may be disposed along the width direction of the sewing table, i.e., arranged in the front-rear direction.

The crank assembly in the embodiment comprises a first crank 17 and a second crank 18 which are respectively arranged at two sides of the cam 1, the first crank 17 is axially connected with the second crank 18, the first crank 17 is provided with the pin shaft, the reset assembly comprises a spring 20 which is arranged on a shear line shaft 26 in a penetrating way, and the spring 20 is connected with the second crank 18; when the trimming driving member 14 stops, the spring 20 pushes the second crank 18 and the first crank 17 to reset, so that the first crank 17 is separated from the cam 1, the trimming shaft 26 stops swinging, and the torsional restoring force generated by the knife rest restoring spring 22 can reset the trimming driving crank 23.

In order to limit the swing range of the shear spool 26, a limiting assembly is disposed on one side of the shear spool 26 in this embodiment, as shown in fig. 8, the limiting assembly includes a limiting block 21 fixed on the shear spool 26, and a cushion 25 disposed on the swing stroke of the limiting block 21 for stopping the limiting block, the cushion 25 is disposed on a screw 27, and the screw 27 is fastened and fixed on the limiting bracket 19 through a nut 28. The height of the cushion pad 25 can be adjusted through the nut 28, and the limiting block 21 is matched with the cushion pad 25 to achieve the limiting purpose.

In summary, the sewing machine of the present invention, by placing the driving member and the needle pitch adjusting crank 12 of the sewing machine (the needle pitch adjusting crank 12 is connected to the feeding swing seat) on the two opposite sides of the oil pump system 200, the close-sewing system 100 and the oil pump system 200 can be distributed on the right side of the sewing platform in a centralized manner, and the structure and position of the existing oil pump system 200 can be unchanged; in addition, the needle pitch adjusting crank 12 is directly driven to act through the driving piece 3, the needle pitch is adjusted to the stitch pitch of the dense sewing, the stitch pitch is not required to be combined with a backstitch crank or a backstitch electromagnet in a backstitch mechanism, the whole automatic dense sewing mechanism is simplified, the dense sewing needle pitch can be accurately controlled, and the short thread end length during thread cutting is further shortened. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the 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

1. The utility model provides a thick material synchronous machine which characterized in that is equipped with in thick material synchronous machine sewing platform's below:

the thread cutting system is used for finishing thread cutting after sewing is finished;

the close sewing system is used for controlling the stitch length to be reduced before thread trimming, and a driving piece in the close sewing system is in transmission connection with a stitch length adjusting crank of the sewing machine through a transmission mechanism;

2. Synchronous thick stock machine according to claim 1, characterized in that the transmission mechanism comprises:

the transition piece is rotationally arranged and provided with a yielding part yielding the oil pump system, the transition piece is connected with the driving rod on the driving piece in a sliding way, and the transition piece is connected with the reset spring;

3. The synchronous thick stock machine of claim 2, wherein: the transition piece is a bending piece with two bent arms, the yielding part is enclosed between the two bent arms, the joint between the two bent arms is connected with the driving rod in a sliding mode, the end part of one bent arm is rotationally positioned, and the end part of the other bent arm is connected with the transmission assembly.

4. The synchronous thick stock machine of claim 2, wherein: the transition piece and the driving rod are connected in a sliding mode as follows: the transition piece is provided with a sliding groove, and the driving rod is connected with the transition piece through a sliding piece arranged in the sliding groove.

5. The synchronous thick stock machine of claim 4, wherein: the transmission assembly is a double-ball-head connecting rod assembly, the double-ball-head connecting rod assembly comprises a rod body, a first ball head and a second ball head, and the length of the rod body is adjustable; the first ball head connects the rod body with the needle pitch adjusting crank, and the second ball head connects the rod body with the driving rod.

6. The synchronous thick stock machine of claim 5, wherein: the rod body comprises three sections, and the first section and the second section are respectively connected with the middle section through threads.

7. The synchronous thick stock machine of claim 6, wherein: the thread direction that the first section links to each other with the interlude is opposite with the thread direction that the second section links to each other with the interlude.

8. The synchronous thick stock machine of claim 1, wherein the thread trimming system comprises:

a trimming driving member;

9. The synchronous thick material machine of claim 8, wherein a limiting component is arranged on one side of the shear line shaft, the limiting component comprises a limiting block fixed on the shear line shaft and a fixedly arranged buffer cushion, and the buffer cushion is positioned on the swing stroke of the limiting block and used for stopping the limiting block.

10. The synchronous thick stock machine of claim 8, wherein the thread trimming drive and the drive in the close-stitch system are arranged along the width direction of the sewing platform.