A hanging strip sewing machine unit

Abstract

The present invention relates to a suspension strip sewing machine group, comprising a frame, a conveying cavity is arranged in the frame, an operating table is arranged in the conveying cavity, a conveying table for conveying material one is arranged on at least one side of the operating table, a sewing machine is arranged on the operating table, a feeding mechanism for conveying material two is arranged on one side of the frame, a feeding back-stitch mechanism and the sewing machine are slidably arranged on the operating table, and the sewing machine is combined and connected with the feeding back-stitch mechanism through a buckle device. The present invention provides a suspension strip sewing machine group, which can stably convey materials that need to be combined and sewn, and can effectively calibrate the posture of the materials; it can also sew materials that need to be sewn in combination, and can realize the back-stitch operation.

Description

Technical Field

[0001] The invention relates to the field of industrial production and processing, mainly to a mechanical mechanism of sewing equipment, and in particular to a suspension strip sewing machine group. Background Art

[0002] Chinese Patent: New Automatic Feeding Sewing Machine (Patent No.: CN201821700252.5); discloses a new automatic feeding sewing machine, including a sewing machine body and a first feeding arm, a second feeding arm, a first optical fiber assembly and a second optical fiber assembly arranged on the sewing machine, wherein the first feeding arm, the first optical fiber assembly and the second feeding arm are fixed to one side of the sewing machine body in sequence through a mounting plate, and the second optical fiber assembly is arranged on the column of the sewing machine body. This application can save the use of manual auxiliary feeding and traditional edge device, realize automatic feeding, and use the first optical fiber assembly and the second optical fiber assembly to cooperate to ensure the uniformity of the stitch spacing after sewing.

[0003] And the prior art, for example, Chinese Patent: A Roller Blind Sewing Device (Patent No.: CN201620311884.7), discloses a roller blind sewing device. It includes a machine head, a feeding mechanism for transmitting a spring for a roller blind, and an automatic hemming mechanism for hemming the side of the roller blind, which includes: a sewing needle mechanism and a presser foot mechanism, and the sewing needle mechanism and the presser foot mechanism are driven to operate through a transmission mechanism; the device also includes a working panel, and the feeding mechanism, the automatic hemming mechanism and the machine head are arranged in sequence along both sides of the working panel; the fabric used for sewing the roller blind moves along the middle position of the working panel, and its two sides pass through the feeding mechanism, the automatic hemming mechanism and the machine head in sequence, and the sewing operation of the spring and the edges of the two sides of the fabric is completed. A hooking mechanism is also arranged on the side of the machine head and the working panel.

[0004] In the prior art, automatic feeding and sewing are realized by the cooperation between the sewing machine and the conveying table. However, there are still technical defects in the prior art. First, the material conveyed on the conveying table cannot be stably conveyed, there is no auxiliary pressure limit mechanism, and the auxiliary pressure limit mechanism cannot be adaptively adjusted according to the size of the conveyed material. Second, two fabrics that need to be sewn cannot be reverse stitched.

[0005] Therefore, it is necessary to develop a hanging strip sewing machine unit that can stably convey materials that need to be combined and sewn, and can effectively calibrate the posture of the materials; it can also sew materials that need to be sewn in combination, and can realize reverse stitch operation. Summary of the invention

[0006] The present invention overcomes the shortcomings of the prior art and provides a suspension strip sewing machine group, which can stably convey materials that need to be combined and sewn, and can effectively calibrate the posture of the materials; it can also combine and sew materials that need to be sewn, and can realize reverse stitch operation.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a hanging strip sewing machine group, including a frame, a conveying chamber is arranged in the frame, an operating table is arranged in the conveying chamber, a sewing machine is arranged on the operating table, a feeding mechanism for conveying material 2 is arranged on one side of the frame, the sewing machine and the feeding back-stitch mechanism are slidably arranged on the operating table, and the sewing machine is combined and connected with the feeding back-stitch mechanism through a snap device.

[0008] In a preferred technical solution of the present invention, the feeding mechanism is provided with a material guiding mechanism 1 and a material guiding and cutting mechanism for conveying material 2 in sequence according to the conveying direction of material 2; the material guiding and cutting mechanism includes a crawler roller group and a material guiding mechanism 2 for smoothing material 2, and a material cutting mechanism for cutting material 2.

[0009] In a preferred technical solution of the present invention, a conveying trough for passing the material 2 is provided at both ends of the material guiding mechanism 2, and a material cutting mechanism is provided on the conveying trough at the rear end.

[0010] In a preferred technical solution of the present invention, the feeding and reversing needle mechanism includes a mounting plate slidably arranged on a frame, and the mounting plate is connected to the frame through a driving mechanism; a lifting device is arranged on the mounting plate, and a conveying device capable of performing lifting and lowering movements on the frame is arranged on the lifting device, and a material guiding mechanism 3 and an auxiliary feeding mechanism are slidably arranged on the conveying device.

[0011] In a preferred technical solution of the present invention, a back-needle assembly is further provided on the conveying device, and the material guide mechanism three and the auxiliary feeding mechanism are driven and connected to the conveying device through the back-needle assembly.

[0012] In a preferred technical solution of the present invention, a conveying table for conveying material 1 is provided on at least one side of the operating table, an auxiliary material-blocking mechanism facing the conveying table is provided on the frame, the auxiliary material-blocking mechanism includes a gantry installed on the support table, a displacement driving mechanism is provided on the gantry, the displacement driving mechanism is driven and connected to a sliding bracket slidably provided on the gantry, a lifting frame capable of lifting and lowering movement is provided on the gantry, and a pivotally connected abutting roller is provided at one end of the lifting frame close to the conveying table.

[0013] In a preferred technical solution of the present invention, a material picking chuck is arranged on the frame, and the material picking chuck includes a material picking mounting plate arranged on the frame, and a displacement device is arranged on the material picking mounting plate, and the displacement device drives the chuck to move to clamp and push material 2.

[0014] In a preferred technical solution of the present invention, a telescopic limit block capable of extending forward and backward is provided on the frame, and a clamping block corresponding to and abutting against the telescopic limit block is provided on the back of the feeding needle-backward mechanism.

[0015] In a preferred technical solution of the present invention, a lifting platform that can be lifted up and down is arranged between the operating platform and the conveying platform.

[0016] In a preferred technical solution of the present invention, in the sewing method of the suspension strip sewing machine group, the material is conveyed to the operating table through the conveying tables arranged on both sides of the operating table;

[0017] At the same time, the material 2 is inserted into the material guide mechanism 1 of the feeding mechanism, and then the material 2 is sequentially inserted through the material guide bracket 1 and the material guide bracket 2 arranged on the frame 1, and then inserted into the crawler roller group, the conveying trough 1, the material guide mechanism 2, and the material cutting mechanism of the material guiding and cutting mechanism, and then passes out;

[0018] The feeding and back-stitching mechanism slidably arranged on the frame and the sewing machine are locked and separated by a buckle device; the limit block passing through the mounting plate is pushed and pulled by the push-up mechanism of the buckle device, and the limit block is pressed and locked with the buckle connecting plate installed on the sewing machine;

[0019] The feeding and back-stitching mechanism and the sewing machine slide to the feeding position of the feeding mechanism, and the material 2 is passed through the material guide mechanism 3 of the feeding and back-stitching mechanism. After the feeding and back-stitching mechanism clamps the material 2, it slides together with the sewing machine to the material taking chuck at the other end of the frame; at this time, the telescopic limit block on the frame extends out, and the telescopic limit block and the card block on the back of the feeding and back-stitching mechanism are abutted against each other for limiting.

[0020] At this time, the material picking chuck clamps the material 2 exposed at the third end of the material guide mechanism, drives the material 2 to slide to the right to the specified position through the displacement device, and drives the sewing machine to the right. At this time, the conveying device, the material guide mechanism 3, the auxiliary feeding mechanism, and the material 2 remain in the limited position, and the sewing machine is driven to the right to start sewing to the specified position, and the sewing seam is sewn out of the edge of the material; the sewing machine changes the moving direction and starts sewing when the elastic member in the backstitch assembly is reset, so as to realize backstitch sewing;

[0021] Then the telescopic limit block on the frame is retracted, and the feeding and reverse needle mechanism and the sewing machine sew back together; then the conveyor table conveys the sewn material one and material two to the next process; the hanging strip sewing machine group cycles back and forth in turn to sew the next combination of material one and material two.

[0022] The present invention solves the defects existing in the background technology, and the beneficial effects of the present invention are as follows:

[0023] A hanging strip sewing machine group can stably convey materials that need to be combined and sewn, and can effectively calibrate the posture of the materials; it can also combine and sew the materials that need to be sewn, and can realize the reverse stitch operation.

[0024] The feeding and back-needling mechanism slidably arranged on the frame and the sewing machine are locked and separated through a snap device; the limit block passing through the mounting plate is pushed and pulled by the push-pull mechanism of the snap device, and the limit block and the snap connection plate installed on the sewing machine are pressed and locked and separated and unlocked.

[0025] The back stitch assembly cooperates with the sewing machine to realize back stitch sewing at the starting ends of the first and second materials to be sewn. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0027] Figure 1 The structure of the preferred embodiment of the present invention is shown in FIG. Figure 1 ;

[0028] Figure 2 The structure of the preferred embodiment of the present invention is shown in FIG. Figure 2 ;

[0029] Figure 3 This is a schematic diagram of the structure of the preferred embodiment of the present invention after the transfer platform is separated. Figure 1 ;

[0030] Figure 4 It is a front view structural schematic diagram of the feeding and reversing needle mechanism in the preferred embodiment of the present invention;

[0031] Figure 5 It is a schematic diagram of the back view of the feeding and back-needling mechanism in the preferred embodiment of the present invention;

[0032] Figure 6 It is a structural schematic diagram of a telescopic limit block of a limit mechanism in a preferred embodiment of the present invention;

[0033] Figure 7 It is a structural schematic diagram of a material guiding mechanism 1 in a preferred embodiment of the present invention;

[0034] Figure 8 It is a structural schematic diagram of a material taking chuck in a preferred embodiment of the present invention;

[0035] Fig. 9 It is a structural schematic diagram of a lifting platform in a preferred embodiment of the present invention;

[0036] Fig.10 It is a structural schematic diagram of the auxiliary material-blocking mechanism in a preferred embodiment of the present invention;

[0037] Fig.11This is a schematic diagram of the structure of the preferred embodiment of the present invention after the transfer platform is separated. Figure 2 ;

[0038] In the figure: 1-frame, 11-transmission frame, 12-support frame, 13-crossbeam support, 131-transmission line rail, 14-lifting platform, 141-lifting mechanism, 15-operating table, 16-transmission chamber, 17-material guide support 1, 18-material guide support 2,

[0039] 2-transmission platform, 21-conveyor belt, 22-auxiliary abutment rotating roller, 23-conveyor belt driving mechanism;

[0040] 3- auxiliary material-resisting mechanism, 31- door frame, 32- displacement driving mechanism, 33- sliding bracket, 34- lifting frame, 35- abutting roller;

[0041] 4-feeding mechanism, 41-material guiding mechanism 1, 42-material guiding and cutting mechanism, 421-material crawler roller group, 422-transmission trough 1, 423-material guiding mechanism 2, 424-material cutting mechanism;

[0042] 5-feeding back-needle mechanism, 51-mounting plate, 52-lifting device, 521-lifting linear rail, 522-lifting plate, 53-transmission device, 531-transmission slide rail, 532-transmission slide plate, 533-back-needle assembly, 534-support plate, 535-axis rod, 536-elastic member, 54-material guide mechanism three, 541-material guide trough, 542-clamping mechanism, 543-clamping cylinder, 544-pressing block, 55-auxiliary feeding mechanism, 551-abutment plate, 552-pressing plate, 553-force rod, 554-limiting plate, 555-rotating wheel, 556-lever, 557-pivot fulcrum, 558-lifting mechanism,

[0043] 6-sewing machine, 61-sewing machine head, 62-sewing machine base;

[0044] 7- material picking chuck, 71- material picking mounting plate, 72- material picking telescopic mechanism, 73- material picking pushing mechanism, 74- chuck;

[0045] 8-limiting mechanism, 81-telescopic limiting block, 82-card block;

[0046] 9-clip device, 91-push-up mechanism, 92-slot, 93-clip tongue, 931-limiting block, 94-clip connecting plate, 941-limiting groove. DETAILED DESCRIPTION

[0047] The present invention will now be further described in detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0048] like Figure 1 to Figure 11 As shown, a suspension strip sewing machine group of the present invention includes a frame 1, the frame 1 includes a conveying chamber 16 provided in the frame 1, an operating table 15 is provided in the conveying chamber 16, conveying frames 11 are provided on both sides of the operating table 15, support frames 12 are provided at both ends of the conveying chamber 16, and a crossbeam bracket 13 located at the upper part of the conveying chamber 16 is provided on the support frame 12. A conveying table 2 for conveying material one is provided on the conveying frame 11. The conveying table 2 adopts the conveyor belt 21 and the conveyor belt driving mechanism 23 of the prior art to cooperate and drive the conveying. And a plurality of auxiliary abutting rotating rollers 22 for auxiliary abutting against the side of the material one are pivotally connected to the conveying frame 11 on at least one side of the conveyor belt 21. A plurality of conveying linear rails 131 are provided on the crossbeam bracket 13, and a material taking chuck 7, a feeding needle reverse mechanism 5, and a sewing machine 6 facing the operating table 15 are slidably provided on the conveying linear rail 131. A feeding mechanism 4 for conveying material 2 is arranged on one side of the frame 1 , and a lifting platform 14 capable of being lifted up and down is arranged between the operating platform 15 and the conveying platform 2 .

[0049] In a preferred technical solution of the present invention, Figure 3 , Fig.11 As shown, the feeding mechanism 4 is provided with a material guiding mechanism 1 41 and a material guiding and cutting mechanism 42 for conveying the material 2 in sequence according to the conveying direction of the material 2; the material guiding and cutting mechanism 42 includes a material crawler roller set 421 and a material guiding mechanism 2 423 for smoothing the material 2, and a material cutting mechanism 424 for cutting the material 2. The two ends of the material guiding mechanism 2 423 are provided with a conveying groove 1 422 for passing the material 2, and the conveying groove 1 422 at the rear end is provided with a material cutting mechanism 424.

[0050] In a preferred technical solution of the present invention, the feeding needle-reversing mechanism 5 and the sewing machine 6 slidingly arranged on the frame 1 are locked and separated by a snap-fit ​​device 9; the pushing mechanism 91 of the snap-fit ​​device 9 pushes and pulls the limit block 931 passing through the mounting plate 51, and the limit block 931 is pressed and locked and separated and unlocked by the snap-fit ​​connection plate 94 installed on the sewing machine 6.

[0051] Specifically, Figure 3~Figure 5 , Fig.11 As shown, the feeding and back-stitching mechanism 5 includes a mounting plate 51 slidably arranged on the frame 1, and the mounting plate 51 is connected to the frame 1 by a driving mechanism; a lifting device 52 is arranged on the mounting plate 51, and a conveying device 53 capable of lifting and lowering on the frame 1 is arranged on the lifting device 52, and a material guide mechanism 3 54 and an auxiliary feeding mechanism 55 are slidably arranged on the conveying device 53. A back-stitching assembly 533 is also arranged on the conveying device 53, and the material guide mechanism 3 54 and the auxiliary feeding mechanism 55 are connected to the conveying device 53 by the back-stitching assembly 533.

[0052] In a preferred technical solution of the present invention, Fig.10As shown, the frame 1 is provided with an auxiliary material-blocking mechanism 3 facing the conveying platform 2, and the auxiliary material-blocking mechanism 3 includes a gantry 31 installed on the conveying platform 2, and a displacement driving mechanism 32 is provided on the gantry 31. The displacement driving mechanism 32 is driven and connected to a sliding bracket 33 slidably arranged on the gantry, and a lifting frame 34 capable of lifting and lowering movements is provided on the gantry 31. The lifting frame 34 is provided with a pivotally connected abutting roller 35 at one end close to the conveying platform 2.

[0053] In a preferred technical solution of the present invention, Figure 3 , Figure 8 As shown, a material taking chuck 7 is arranged on the frame 1, and the material taking chuck 7 includes a material taking mounting plate 71 arranged on the frame 1, and a displacement device is arranged on the material taking mounting plate 71, and the displacement device drives the chuck 74 to move to clamp and push the material 2. The limiting mechanism 8 also includes a telescopic limiting block 81 arranged on the frame 1, and a card block 82 installed on the back of the mounting plate 51 in the feeding needle backing mechanism 5 and abutting against the telescopic limiting block 81 to limit the position.

[0054] The working principle of the hanging strip sewing machine unit is:

[0055] like Figure 1 to Figure 11 As shown, the material is conveyed to the operating platform 15 through the conveying platforms 2 arranged on both sides of the operating platform 15 .

[0056] At the same time, material 2 is passed through the material guiding mechanism 1 41 of the feeding mechanism 4, and then material 2 is passed through the material guiding bracket 1 17 and the material guiding bracket 2 18 in sequence. The material guiding bracket 17 and the material guiding bracket 2 18 are staggered on the frame 1, and then material 2 is passed through the crawler roller group 421, the conveying trough 1 422, and the material guiding mechanism 2 423 of the material diversion and cutting mechanism 42, and passes out from the cutting mechanism 424 arranged on the material guiding mechanism 2 423.

[0057] The feeding needle-backing mechanism 5 and the sewing machine 6 slidingly arranged on the frame 1 are locked and separated by the buckle device 9; the push-up mechanism 91 of the buckle device 9 pushes and pulls the limit block 931 passing through the mounting plate 51, and is pressed and locked between the limit block 931 and the buckle connecting plate 94 installed on the sewing machine 6; the feeding needle-backing mechanism 5 and the sewing machine 6 slide to the feeding position of the feeding mechanism 4, and after the material 2 passes through the guide mechanism 3 54 in the feeding needle-backing mechanism 5, the feeding needle-backing mechanism 5 clamps the material 2, and the feeding needle-backing mechanism 5 and the sewing machine 6 slide to the other end of the frame, and the needle-backing mechanism 5 synchronously pulls the material 2 to slide to the specified position at the other end of the frame 1. At this time, the feeding needle-backing mechanism 5 When the block 82 set on the back of the back-stitch mechanism 5 reaches the position of the corresponding telescopic limit block 81 set on the frame 1, the telescopic limit block 81 is pushed forward and abuts against the block 82. The positions of the material guide mechanism three 54 and the auxiliary feeding mechanism 55 in the feeding back-stitch mechanism 5 are limited by the mutual cooperation of the telescopic limit block 81 and the block 82 in the limiting mechanism 8. The sewing machine 6 continues to slide forward and sew. The back-stitch assembly 533 is used to drive the sewing machine 6 back and forth. When pulling back, the sewing machine 6 realizes back-stitch sewing to the position limited by the telescopic limit block 81. At this time, the telescopic limit block 81 is retracted, and the feeding back-stitch mechanism 5 and the sewing machine 6 synchronously slide toward the loading position of material two to sew.

[0058] The above is an inspiration based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the scope of the technical idea of ​​the present invention.

Claims

1. A hanging strip sewing machine assembly, comprising a frame (1), wherein a transfer chamber (16) is arranged in the frame (1), an operating table (15) is arranged in the transfer chamber (16), and a sewing machine (6) is arranged on the operating table (15), characterized in that: A feeding mechanism (4) for conveying material 2 is disposed on one side of the frame (1); a feeding and back-stitching mechanism (5) and the sewing machine (6) are slidably disposed on the operating table (15); the sewing machine (6) is assembled and connected to the feeding and back-stitching mechanism (5) via a snap-fit ​​device (9); The feeding and reversing needle mechanism (5) comprises a mounting plate (51) slidably mounted on a frame (1), the mounting plate (51) being drivingly connected to the frame (1) via a driving mechanism; a lifting device (52) is mounted on the mounting plate (51), a conveying device (53) capable of performing a lifting action on the frame (1) is mounted on the lifting device (52), and a material guiding mechanism (54) and an auxiliary feeding mechanism (55) are slidably mounted on the conveying device (53); The conveying device (53) is also provided with a back-needle assembly (533), and the material guide mechanism (54) and the auxiliary material feeding mechanism (55) are driven and connected to the conveying device (53) through the back-needle assembly (533); The frame (1) is provided with a telescopic limit block (81) capable of being telescopically extended forward and backward, and the back of the feeding needle-reversing mechanism (5) is provided with a clamping block (82) corresponding to and abutting against the telescopic limit block (81); When the elastic member (536) in the back-stitch assembly (533) is reset, the sewing machine (6) changes its moving direction and starts sewing, thereby achieving back-stitch sewing.

2. The suspension strip sewing machine unit according to claim 1, characterized in that: The feeding mechanism (4) is provided with a material guiding mechanism (41) and a material guiding and cutting mechanism (42) for conveying the material (42) in sequence according to the conveying direction of the material (4); the material guiding and cutting mechanism (42) comprises a material crawler roller group (421) and a material guiding mechanism (423) for smoothing the material (42), and a material cutting mechanism (424) for cutting the material (424).

3. The suspension strip sewing machine unit according to claim 2, characterized in that: A conveying trough (422) for passing material 2 is respectively arranged at both ends of the second material guiding mechanism (423), and a material cutting mechanism (424) is arranged on the conveying trough (422) close to the operating table (15).

4. The suspension strip sewing machine unit according to claim 3, characterized in that: A conveying platform (2) for conveying material 1 is arranged on at least one side of the operating table (15); an auxiliary material-resisting mechanism (3) facing the conveying platform (2) is arranged on the frame (1); the auxiliary material-resisting mechanism (3) comprises a door frame (31) mounted on the conveying platform (2); a displacement driving mechanism (32) is arranged on the door frame (31); the displacement driving mechanism (32) is drivingly connected to a sliding bracket (33) slidably arranged on the door frame; a lifting frame (34) capable of lifting and lowering is arranged on the door frame (31); and a pivotally connected abutting roller (35) is arranged at one end of the lifting frame (34) close to the conveying platform (2).

5. The suspension strip sewing machine unit according to claim 4, characterized in that: The frame (1) is provided with a material taking chuck (7), the material taking chuck (7) comprising a material taking mounting plate (71) arranged on the frame (1), a displacement device being arranged on the material taking mounting plate (71), the displacement device driving the chuck (74) to move to grip and push material 2.

6. The suspension strip sewing machine unit according to claim 5, characterized in that: A lifting platform (14) capable of being lifted up and down is arranged between the operating platform (15) and the conveying platform (2).

7. The suspension strip sewing machine unit according to any one of claims 1 to 6, characterized in that: In the sewing method of the suspension strip sewing machine group, The material is transferred to the operating table (15) through the transfer tables (2) arranged on both sides of the operating table (15); At the same time, the material 2 is inserted into the material guide mechanism 1 (41) of the feeding mechanism (4), and then the material 2 is sequentially inserted through the material guide bracket 1 (17) and the material guide bracket 2 (18) provided on the frame (1), and then inserted into the crawler roller group (421), the conveying trough 1 (422), the material guide mechanism 2 (423), and the material cutting mechanism (424) of the material dispersing and cutting mechanism (42) before passing out; A feeding and reversing needle mechanism (5) slidably arranged on a frame (1) and a sewing machine (6) are locked and separated by means of a buckle device (9); a limit block (931) passing through a mounting plate (51) is pushed and pulled by means of a push-up mechanism (91) of the buckle device (9), and the limit block (931) is pressed and locked with a buckle connecting plate (94) installed on the sewing machine (6); The feeding and back-stitching mechanism (5) and the sewing machine (6) slide to the feeding position of the feeding mechanism (4), and the material 2 is passed through the material guide mechanism 3 (54) of the feeding and back-stitching mechanism (5). After the feeding and back-stitching mechanism (5) clamps the material 2, it slides together with the sewing machine (6) to the material taking clamp (7) at the other end of the frame (1). At this time, the telescopic limit block (81) on the frame (1) extends out, and the telescopic limit block (81) and the clamp block (82) on the back of the feeding and back-stitching mechanism (5) are abutted against each other for limiting. At this time, the material taking chuck (7) clamps the material 2 exposed at the end of the material guide mechanism 3 (54), drives the material 2 to slide to the right to the specified position through the displacement device, and then drives the sewing machine (6) to the right. At this time, the conveying device (53), the material guide mechanism 3 (54), the auxiliary feeding mechanism (55), and the material 2 remain in the limited position, and drives the sewing machine (6) to the right to start sewing to the specified position, and sews the sewing seam out of the edge of the material; when the elastic member (536) in the back stitch assembly (533) is reset, the sewing machine (6) changes the moving direction and starts sewing, thereby realizing back stitch sewing; Then the telescopic limit block (81) on the frame (1) is retracted, and the feeding and reversing needle mechanism (5) and the sewing machine (6) sew back together; then the conveying table (2) conveys the sewn material one and material two to the next process; the hanging strip sewing machine group circulates and reciprocates in sequence to sew the next combination of material one and material two.

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