Double threader device for jumpers and waistband machine

Abstract

The application provides a double-row thread clamp device and a waistband machine for skip stitching, and belongs to the technical field of sewing equipment. The double-row thread clamp device comprises a mounting seat, a thread loosening plate one and a thread loosening plate two are mounted on the mounting seat, a thread loosening hook one is arranged on the thread loosening plate one, a thread loosening hook two is arranged on the thread loosening plate two, a thread clamp assembly one and a thread clamp assembly two are arranged on the mounting seat, the thread clamp assembly one comprises a strong thread clamp knob one and a weak thread clamp knob one, the thread clamp assembly two comprises a strong thread clamp knob two and a weak thread clamp knob two, a reset part is arranged on the mounting seat, the reset part is arranged to make the thread loosening hook two be clamped between the thread clamping pieces one and the thread clamping pieces two on the corresponding weak thread clamp knob two, and a driving part one or a driving part two is further arranged on the mounting seat. The double-row thread clamp device can conveniently adjust the tension of the sewing thread, ensure that the skip stitching process is smoothly completed, and greatly improve the sewing quality.

Description

Technical Field

[0001] This invention belongs to the field of sewing equipment technology, and relates to a double-row thread clamp device and a waistband sewing machine for skip stitching. Background Technology

[0002] To achieve the skip-stitch technique on the waistband machine, the tension of the thread on the thread tensioner needs to be controlled, such as... Figure 1 As shown:

[0003] Section A has a normal stitch, while section B requires a skip stitch. The tension of the thread in section B needs to be different from that in section A. If it is the same, the stability of the skip stitch will be affected, or it may even fail.

[0004] In existing technology, the thread tensioners on sewing equipment are generally in a single row, and each tensioner clamps or releases the thread simultaneously. When a skipped seam occurs, if the thread tensioners do not release the thread, the bobbin thread tension is high enough to prevent the formation of a loop. However, due to excessive tension in the top thread, the skipped seam section will be shorter than the fabric length without forming a normal stitch, causing the fabric to twist. If all the thread tensioners release the thread, the following problems arise: the bobbin thread tension is insufficient to keep the thread taut, causing the hook to snag on the thread and form a loop; the top thread has no tension, making it difficult to pull up the thread, resulting in an unsuccessful skipped seam.

[0005] For an explanation of the working principle of the wire clamp, please refer to the patent document with application number 201510403591.1, which discloses a dual tension wire clamp. Summary of the Invention

[0006] In view of the above-mentioned problems existing in the prior art, the present invention provides a double-row thread clamp device for skip stitches. The technical problem to be solved by the present invention is: how to adjust the tension of the thread.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A double-row thread clamp device for skipping seams, the double-row thread clamp device includes a mounting base, characterized in that the mounting base is equipped with a movable thread loosening plate 1 and a thread loosening plate 2, the thread loosening plate 1 is provided with a plurality of thread loosening hooks 1, the thread loosening plate 2 is provided with a plurality of thread loosening hooks 2, the mounting base is provided with a thread clamp assembly 1 and a thread clamp assembly 2, the thread clamp assembly 1 includes a set of strong thread clamp knobs 1 and a set of weak thread clamp knobs 1, the thread clamp assembly 2 includes a set of strong thread clamp knobs 2 and a set of weak thread clamp knobs 2, and so on. The mounting base is provided with a reset component, which causes the second loosening hook to engage between the first and second clamping plates on the corresponding weak clamp knob. The mounting base is also provided with a driving component or several driving components, which drive the first and second loosening plates to move, causing the second loosening hook to disengage from the first and second clamping plates on the corresponding weak clamp knob, and causing the first loosening hook to engage between the first and second clamping plates on the corresponding strong clamp knob and weak clamp knob.

[0009] Alternatively, each of the two driving components can drive the first and second loosening plates to move, causing the second loosening hook to disengage from the clamping plates on the corresponding weak clamping knob, and causing the first loosening hook to engage between the clamping plates on the corresponding strong clamping knob and the weak clamping knob.

[0010] In the above-mentioned double-row wire clamp device for skipping seams, the first driving component includes a cylinder, a loosening head is installed on the piston rod of the cylinder, a movable plate is fixed on the first and second loosening plates, the loosening head can abut against the movable plate, and the reset component is connected between the movable plate and the mounting base.

[0011] In this structure, the first driving component drives the loosened wire head to move. When the loosened wire head comes into contact with the movable plate, the loosened wire head pushes the movable plate to move, and the movable plate drives the loosened wire plate one and the loosened wire plate two to move.

[0012] In the above-mentioned double-row wire clamp device for skipping seams, a through hole is provided on the movable plate, and the loosened wire end includes a main body, the upper part of which has a boss, and the boss is located in the through hole.

[0013] The boss on the main body is located in the through hole of the movable plate. When the drive unit drives the loose wire head to move downward, the boss on the main body of the loose wire head abuts against the inner wall of the through hole of the movable plate, causing the movable plate to move downward.

[0014] The following explanation uses one implementation method as an example to illustrate its working principle:

[0015] In this double-row thread clamp device, all thread clamp knobs include a first thread clamp and a second thread clamp. When the machine is sewing normally, the drive component is in a retracted state. Under the force of the reset component, the first and second thread loosening plates are in an upward state. In thread clamp assembly one, all the first and second thread clamps on the strong thread clamp knob one and the weak thread clamp knob one are in a close-fitting state. In thread clamp assembly two, the first and second thread clamps on the strong thread clamp knob two are in a close-fitting state, while the first and second thread clamps on each weak thread clamp knob are in a loosened state because the second thread loosening hook of the second thread loosening plate is stuck in the middle. The tension of each thread is subjected to the force of the two thread clamp assemblies respectively.

[0016] During normal sewing, the tension of the weak thread clamp knob 1 of thread clamp component one is sometimes too weak. In skip stitch mode, it is not enough to keep the thread (top thread) taut, making it difficult for the hook to catch the thread, resulting in skip stitch failure. Therefore, the tension of the weak thread clamp knob 2 of thread clamp component two needs to be slightly greater than that of the weak thread clamp knob 1 of thread clamp component one. The tension of the top thread is exactly the opposite. The top thread needs a certain amount of tension, but not as much as during normal sewing. Some of the force needs to be released.

[0017] Therefore, when the machine requires the skip-seam function, the control system will open the air circuit, and the drive component one will push the loosening head. The loosening head will drive the movable plate to move downward (at this time, the reset component is in a stretched state), causing the loosening plate one and loosening plate two to move downward. The clamping pieces one and two of the strong clamping knob two of the clamping device assembly two will remain in a closed state. However, due to the downward movement of the loosening hook head two of the loosening plate two, the clamping pieces one and two on each of the weak clamping knob two will be in a closed state. In the clamping device assembly one, all the clamping pieces one and two on the strong clamping knob one and the weak clamping knob one will be in a loosened state due to the movement of the loosening plate one, and the loosening hook head one on the loosening plate one will be respectively engaged between the clamping pieces one and two on each of the strong clamping knob one and each of the weak clamping knob one. The tension of each thread at the top is only exerted by the force of the left-side thread clamp, and the tension of each thread at the bottom is only exerted by the left-side thread clamp. This allows for the adjustment of the thread tension required when skipping seams.

[0018] When the gap-opening period ends, the controller closes the air circuit, and under the force of the reset component, the first and second loosening plates return to their original positions.

[0019] This double-row thread tensioner device can easily adjust the tension of the thread, ensuring the smooth completion of the skip stitch process and greatly improving the sewing quality.

[0020] The first and second slack plates of this double-row wire clamp device are driven by the same drive source, which simplifies the structure of the device and greatly improves work efficiency.

[0021] In another embodiment, the first slack wire plate and the second slack wire plate can also be driven by the corresponding second drive component. In this case, the first slack wire plate and the second slack wire plate move separately without affecting each other.

[0022] In the above-mentioned double-row wire clamp device for skipping seams, side groove 1 and side groove 2 are respectively provided on one side of the first wire loosening plate and one side of the second wire loosening plate, and the movable plate is engaged with side groove 1 and side groove 2.

[0023] The movable plate is snapped into side groove one and side groove two, thus fixing it to loose wire plate one and loose wire plate two. The connection is more stable due to the snap-fit ​​structure.

[0024] In the above-mentioned double-row wire clamp device for skipping seams, there are also several wire guide plates. Each wire guide plate includes a main body with a raised edge on the opposite side of the main body. Wire guide holes are respectively opened on the raised edge. The main body is mounted on the mounting base. Wire loosening plate one and wire loosening plate two are movably connected to the main body of the corresponding wire guide plate.

[0025] The thread guide holes on the raised edge of the thread guide plate are used for the thread to pass through, and play a good guiding role for the thread during sewing.

[0026] In the above-mentioned double-row clamp device for skipping seams, the reset element includes a spring or a rubber sleeve, one end of the spring being connected to a movable plate and the other end of the spring being connected to a mounting base, or one end of the rubber sleeve being connected to a movable plate and the other end of the rubber sleeve being connected to a mounting base.

[0027] In the above-mentioned double-row wire clamp device for skipping seams, the first driving component includes a hydraulic cylinder or a linear motor, and the second driving component includes a pneumatic cylinder, a hydraulic cylinder, or a linear motor.

[0028] In the above-mentioned double-row wire clamp device for skipping seams, a guide groove is provided on the loosening plate, and a fixing rod is provided on the strong wire clamp knob and the weak wire clamp knob respectively. The fixing rods on the strong wire clamp knob and the weak wire clamp knob respectively pass through one of the guide grooves and are fixed on the mounting base.

[0029] In the above-mentioned double-row wire clamp device for skipping seams, the loosening plate 2 is provided with a guide groove 2, and the weak wire clamp knob 2 is respectively provided with a fixing rod. The fixing rod on the weak wire clamp knob 2 passes through one of the guide grooves 2 and is fixed on the mounting base.

[0030] The present invention also provides a waistband machine, which includes any of the above-mentioned double-row stitch clamp devices for skip stitching.

[0031] In the above-mentioned waistband machine, the waistband machine includes a machine housing, and the mounting base of the double-row thread clamp device is fixed to the machine housing by screws, and a spacer is provided between the mounting base and the machine housing.

[0032] The mounting base is fixed to the casing of the waistband machine with screws. A spacer is placed between the casing of the waistband machine and the mounting base to prevent the mounting base from scratching the casing of the waistband machine.

[0033] In the above-mentioned waistband machine, the double-row thread clamp device includes a set of strong thread clamp knobs one comprising four strong thread clamp knobs one, a set of weak thread clamp knobs one comprising four weak thread clamp knobs one, a set of strong thread clamp knobs two comprising four strong thread clamp knobs two, and a set of weak thread clamp knobs two comprising four weak thread clamp knobs two.

[0034] Compared with the prior art, the advantages of the present invention are as follows:

[0035] 1. This double-row thread tensioner device can easily adjust the tension of the sewing thread, ensuring the smooth completion of the skip stitch process and greatly improving the sewing quality.

[0036] 2. The first and second slack plates of this double-row wire clamp device are driven by the same drive source, which simplifies the structure of the device and greatly improves working efficiency. Attached Figure Description

[0037] Figure 1 This is a diagram illustrating the skipped seam technique for trouser waistbands;

[0038] Figure 2 This is a schematic diagram of the structure of this double-row wire clamp device;

[0039] Figure 3 This is a schematic diagram of the rear structure of the double-row wire clamp device;

[0040] Figure 4 This is a structural schematic diagram of the loose wire plate;

[0041] Figure 5 This is a schematic diagram of the structure of the second loosening plate;

[0042] Figure 6 This is a schematic diagram of the structure of the weak wire clamp knob one;

[0043] Figure 7 This is a schematic diagram showing the connection between the loose wire end and the movable plate;

[0044] Figure 8 This is a schematic diagram of a double-row stitch clamp device installed on a waistband machine.

[0045] In the diagram: 1 Mounting base, 2 Cable release plate one, 3 Cable release plate two, 4 Cable release hook one, 5 Cable release hook two, 6 Cable clamp assembly one, 7 Cable clamp assembly two, 8 Strong cable clamp knob one, 9 Weak cable clamp knob one, 10 Strong cable clamp knob two, 11 Weak cable clamp knob two, 12 Cable clamping piece one, 13 Cable clamping piece two, 14 Reset piece, 15 Drive piece one, 16 Cylinder, 17 Cable release head, 18 Movable plate, 19 Through hole, 20 Main body, 21 Boss, 22 Side groove one, 23 Side groove two, 24 Cable guide plate, 25 Main body, 26 Protruding edge, 27 Cable guide hole, 28 Guide groove one, 29 Fixing rod, 30 Guide groove two, 31 Housing, 32 Spacer. Detailed Implementation

[0046] The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0047] like Figure 2-6 As shown, this double-row wire clamp device includes a mounting base 1, on which are mounted movable wire loosening plates 2 and 3. Wire loosening plate 2 has several wire loosening hooks 4, and wire loosening plate 3 has several wire loosening hooks 5. The mounting base 1 also includes a wire clamp assembly 6 and a wire clamp assembly 7. Wire clamp assembly 6 includes a set of strong wire clamp knobs 8 and a set of weak wire clamp knobs 9. Wire clamp assembly 7 includes a set of strong wire clamp knobs 10 and a set of weak wire clamp knobs 11. The mounting base 1 is equipped with a reset component 14 for resetting. Component 14 causes the loosening hook 2 5 to respectively engage between the clamping plates 12 and 13 on the corresponding weak clamp knob 2 11. The mounting base 1 is also provided with a driving component 15 or several driving components 2. The driving component 15 drives the loosening plate 1 2 and the loosening plate 2 3 to move, so that the loosening hook 2 5 disengages from the clamping plates 12 and 13 on the corresponding weak clamp knob 2 11, and causes the loosening hook 1 4 to respectively engage between the clamping plates 12 and 13 on the corresponding strong clamp knob 1 8 and weak clamp knob 1 9.

[0048] Alternatively, each of the two driving components can drive the loosening plate 2 and the loosening plate 3 to move, so that the loosening hook 5 disengages from the clamping piece 12 and the clamping piece 13 on the corresponding weak clamping knob 11, and the loosening hook 4 is respectively engaged between the clamping piece 12 and the clamping piece 13 on the corresponding strong clamping knob 8 and the weak clamping knob 9.

[0049] In this double-row wire clamp device, one set of strong wire clamp knob 1 8 includes two or more strong wire clamp knobs 1 8, one set of weak wire clamp knob 1 9 includes two or more weak wire clamp knobs 1 9, one set of strong wire clamp knob 2 10 includes two or more strong wire clamp knobs 2 10, and one set of weak wire clamp knob 2 11 includes two or more weak wire clamp knobs 2 11. At least two of each wire clamp knob are required, meaning at least eight of the above-mentioned wire clamp knobs must work together to achieve the skipped seam effect.

[0050] like Figure 7 As shown, in this embodiment, the drive component 15 includes a cylinder 16, a loosening head 17 is installed on the piston rod of the cylinder 16, a movable plate 18 is fixed on the loosening plate 1 2 and the loosening plate 2 3, the loosening head 17 can abut against the movable plate 18, and a reset component 14 is connected between the movable plate 18 and the mounting base 1.

[0051] In this structure, the drive component 15 drives the loose wire head 17 to move. When the loose wire head 17 abuts against the movable plate 18, the loose wire head 17 pushes the movable plate 18 to move, and the movable plate 18 drives the loose wire plate 2 and the loose wire plate 3 to move.

[0052] like Figure 7 As shown, in this embodiment, the movable plate 18 has a through hole 19, and the loose wire end 17 includes a main body 20. The upper part of the main body 20 has a boss 21, which is located in the through hole 19.

[0053] The boss 21 on the main body 20 is located in the through hole 19 of the movable plate 18. When the drive member drives the loose wire 17 to move downward, the boss 21 on the main body 20 of the loose wire 17 abuts against the inner wall of the through hole 19 of the movable plate 18, causing the movable plate 18 to move downward.

[0054] The following explanation uses one implementation method as an example to illustrate its working principle:

[0055] In this double-row thread clamp device, all thread clamp knobs include a first thread clamping piece 12 and a second thread clamping piece 13. When the machine is sewing normally, the drive component is in a retracted state. Under the force of the reset component 14, the first thread loosening plate 2 and the second thread loosening plate 3 are in an upward state. In the first thread clamp assembly 6, all the first thread clamping pieces 12 and the second thread clamping piece 13 on the strong thread clamp knob 8 and the weak thread clamp knob 9 are in a close-fitting state. In the second thread clamp assembly 7, the first thread clamping pieces 12 and the second thread clamping piece 13 on the strong thread clamp knob 20 are in a close-fitting state, while the first thread clamping pieces 12 and the second thread clamping piece 13 on each weak thread clamp knob are in a loosened state because the second thread loosening hook 25 of the second thread loosening plate 3 is stuck in the middle. The tension of each thread at the top is exerted by two thread clamping components. Because the tension of the top thread (sewing thread) is relatively large, if the sewing process is stopped and restarted midway under the action of a single thread clamp, the top thread (sewing thread) is prone to slipping out of the clamping plate, resulting in no tension in the sewing thread and affecting the stitching. Each thread at the bottom is only subjected to the force of the thread clamping component 6. Because the tension of the bottom thread is small, the impact is not significant.

[0056] During normal sewing, the weak thread tension knob 9 of thread tensioner assembly 16 sometimes has too little force. In skip stitch mode, it is not enough to keep the thread (top thread) taut, making it difficult for the hook to catch the thread, resulting in skip stitch failure. Therefore, it is necessary to use the weak thread tension knob 211 of thread tensioner assembly 27 with a tension slightly greater than that of the weak thread tension knob 9 of thread tensioner assembly 16. The tension of the top thread has the opposite effect. The top thread needs a certain amount of tension, but not as much as during normal sewing. Some of the force needs to be released.

[0057] Therefore, when the machine requires the skip-seam function, the control system will open the air circuit, and the drive component 15 will push the loosening head 17. The loosening head 17 will drive the movable plate 18 to move downward (at this time, the reset component 14 is in a stretched state), causing the loosening plate 2 and the loosening plate 3 to move downward. The clamping plates 12 and 13 of the strong clamping knob 10 of the clamping assembly 7 will remain in a close contact state. However, the weak clamping knob 11 will be affected by the downward movement of the loosening hook 25 of the loosening plate 3, and the weak clamping plates will be affected. When the thread clamping plates 12 and 13 on knob 11 are in contact, in the thread clamp assembly 6, all the thread clamping plates 12 and 13 on the strong thread clamp knob 8 and the weak thread clamp knob 9 are in a loosened state due to the downward movement of the loosening plate 2 and the thread loosening hooks 4 on the loosening plate 2 engaging with the thread clamping plates 12 and 13 on each of the strong and weak thread clamp knobs 8 and 9. The tension of each thread above is only affected by the force of the left thread clamp, and the tension of each thread below is only affected by the force of the left thread clamp. This allows for the adjustment of the thread tension required for skip stitching.

[0058] When the gap-skipping period ends, the controller closes the air circuit, and under the force of the reset component 14, the wire release plate 12 and the wire release plate 23 return to their original positions.

[0059] This double-row thread tensioner device can easily adjust the tension of the thread, ensuring the smooth completion of the skip stitch process and greatly improving the sewing quality.

[0060] The slack plate 2 and slack plate 3 of this double-row wire clamp device are driven by the same drive source, which simplifies the structure of the device and greatly improves working efficiency.

[0061] In another embodiment, the first slack wire plate 2 and the second slack wire plate 3 can also be driven by the corresponding second drive component. In this case, the first slack wire plate 2 and the second slack wire plate 3 move separately without affecting each other.

[0062] like Figure 4 and 5 As shown, in this embodiment, side groove 22 and side groove 23 are respectively provided on one side of the loosening plate 2 and the loosening plate 3, and the movable plate 18 is snapped onto the side groove 22 and side groove 23.

[0063] The movable plate 18 is snapped into the side groove 22 and the side groove 23, thereby fixing it to the loose wire plate 2 and the loose wire plate 3. The connection is more stable due to the snap-fit ​​structure.

[0064] like Figure 8 As shown, in this embodiment, the double-row wire clamp device also includes several wire guide plates 24. Each wire guide plate 24 includes a main body 25. The opposite sides of the main body 25 have protruding edges 26, and wire guide holes 27 are respectively opened on the protruding edges 26. The main body 25 is mounted on the mounting base 1. The wire loosening plate 1 2 and the wire loosening plate 2 3 are movably connected to the main body 25 of the corresponding wire guide plate 24.

[0065] The thread guide hole 27 on the protruding edge 26 of the thread guide plate 24 is used for the thread to pass through, and plays a good guiding role for the thread during sewing.

[0066] As one embodiment, the reset member 14 includes a spring, one end of which is connected to the movable plate 18 and the other end of which is connected to the mounting base 1.

[0067] In another embodiment, the reset member 14 includes a rubber sleeve, one end of which is connected to the movable plate 18, and the other end of which is connected to the mounting base 1.

[0068] In other embodiments, drive component 15 may include a hydraulic cylinder or a linear motor, and drive component 2 may also include a cylinder 16, a hydraulic cylinder, or a linear motor.

[0069] like Figure 4 and 6As shown in this embodiment, a guide groove 28 is provided on the loosening plate 2, and a fixing rod 29 is provided on the strong clamp knob 8 and the weak clamp knob 9 respectively. The fixing rod 29 on the strong clamp knob 8 and the weak clamp knob 9 respectively passes through a guide groove 28 and is fixed on the mounting base 1.

[0070] Preferably, a guide sleeve is fitted on the fixing rod 29. The guide sleeve is located in the guide groove 28 and can slide relative to the guide groove 28. The guide groove 28 plays a guiding role, so that the loosening plate 2 moves back and forth along a predetermined direction to achieve loosening and resetting of the wire.

[0071] like Figure 5 As shown, in this embodiment, the wire loosening plate 2 3 is provided with a guide groove 2 30, and the weak wire clamp knob 2 11 is provided with a fixing rod 29. The fixing rod 29 on the weak wire clamp knob 2 11 passes through a guide groove 2 30 and is fixed on the mounting base 1.

[0072] Preferably, a guide sleeve is fitted on the fixing rod 29. The guide sleeve is located in the guide groove 30 and can slide relative to the guide groove 30. The guide groove 30 plays a guiding role, so that the loosening plate 3 can move back and forth in a predetermined direction to achieve loosening and resetting of the wire.

[0073] The present invention also provides a waistband machine, which includes any of the above-mentioned double-row stitch clamp devices for skip stitching.

[0074] like Figure 8 As shown, in this embodiment, the waistband machine includes a housing 31, and the mounting base 1 of the double-row wire clamp device is fixed to the housing 31 by screws. A spacer 32 is provided between the mounting base 1 and the housing 31.

[0075] Mounting base 1 is fixed to the housing 31 of the waistband machine with screws. Spacer 32 is placed between the housing 31 of the waistband machine and mounting base 1 to prevent mounting base 1 from scratching the housing 31 of the waistband machine.

[0076] As one embodiment, in the double-row stitching device of this waistband machine, a set of strong stitching knobs 1-8 includes four strong stitching knobs 1-8, a set of weak stitching knobs 1-9 includes four weak stitching knobs 1-9, a set of strong stitching knobs 2-10 includes four strong stitching knobs 2-10, and a set of weak stitching knobs 2-11 includes four weak stitching knobs 2-11. That is, each stitching knob has 4 knobs, and a total of 16 of the above-mentioned stitching knobs work together to achieve the skip-stitch effect.

[0077] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A double row threader device for jump stitches, comprising a mounting base (1), characterized in that, The installation seat (1) is provided with movable thread loosening plate one (2) and thread loosening plate two (3), the thread loosening plate one (2) is provided with several thread loosening hook one (4), the thread loosening plate two (3) is provided with several thread loosening hook two (5), the installation seat (1) is provided with thread clamp assembly one (6) and thread clamp assembly two (7), the thread clamp assembly one (6) includes a group of strong thread clamp knob one (8) and a group of weak thread clamp knob one (9), the thread clamp assembly two (7) includes a group of strong thread clamp knob two (10) and a group of weak thread clamp knob two (11), the installation seat (1) is provided with reset member (14), the reset member (14) makes the thread loosening hook two (5) respectively clamped between the thread clamp piece one (12) and thread clamp piece two (13) on the corresponding weak thread clamp knob two (11), the installation seat (1) is further provided with driving member one (15) or several driving member two, the driving member one (15) drives the thread loosening plate one (2) and thread loosening plate two (3) to move, makes the thread loosening hook two (5) respectively from the thread clamp piece one (12) and thread clamp piece two (13) between the corresponding weak thread clamp knob two (11) release, and makes the thread loosening hook one (4) respectively clamped between the thread clamp piece one (12) and thread clamp piece two (13) on the corresponding strong thread clamp knob one (8) and weak thread clamp knob one (9); Or each driving member two respectively drives the thread loosening plate one (2) and thread loosening plate two (3) to move, makes the thread loosening hook two (5) respectively from the thread clamp piece one (12) and thread clamp piece two (13) between the corresponding weak thread clamp knob two (11) release, and makes the thread loosening hook one (4) respectively clamped between the thread clamp piece one (12) and thread clamp piece two (13) on the corresponding strong thread clamp knob one (8) and weak thread clamp knob one (9); When the machine is normally sewn, in the thread clamp assembly one (6), all thread clamp piece one (12) and thread clamp piece two (13) on the strong thread clamp knob one (8) and weak thread clamp knob one (9) are in the state of adhesion, in the thread clamp assembly two (7), the thread clamp piece one (12) and thread clamp piece two (13) of strong thread clamp knob two (10) are in the state of adhesion, and the thread clamp piece one (12) and thread clamp piece two (13) on each weak thread clamp knob two (11) are in the state of loosening because the thread loosening hook two (5) of thread loosening plate two (3) is clamped in the middle, When the machine needs to skip sewing function, the thread clamp piece one (12) and thread clamp piece two (13) of strong thread clamp knob two (10) of thread clamp assembly two (7) remain in the state of adhesion, the weak thread clamp knob two (11) moves down because of the thread loosening hook two (5) of thread loosening plate two (3), the thread clamp piece one (12) and thread clamp piece two (13) on each weak thread clamp knob two (11) are in the state of adhesion, in the thread clamp assembly one (6), all thread clamp piece one (12) and thread clamp piece two (13) on the strong thread clamp knob one (8) and weak thread clamp knob one (9) are in the state of loosening because the thread loosening plate one (2) moves down, and the thread clamp piece one (12) and thread clamp piece two (13) are in the state of loosening.

2. A double threader device for stitch skipping according to claim 1, characterized in that, The driving member one (15) comprises a cylinder (16), a line loosening head (17) is installed on the piston rod of the cylinder (16), a movable plate (18) is fixed on the line loosening plate one (2) and the line loosening plate two (3), the line loosening head (17) can abut against the movable plate (18), and the movable plate (18) and the mounting base (1) are connected with the reset member (14).

3. A double threader device for jump stitches according to claim 2, characterized in that A through hole (19) is formed in the movable plate (18), the line loosening head (17) comprises a main body (20), the upper portion of the main body (20) is provided with a boss (21), and the boss (21) is located in the through hole (19).

4. A double threader device for stitch skipping according to claim 2 or 3, characterized in that A side groove one (22) and a side groove two (23) are respectively formed in one side of the line loosening plate one (2) and one side of the line loosening plate two (3), and the movable plate (18) is clamped in the side groove one (22) and the side groove two (23).

5. A double threader device for stitch skipping according to claim 1 or 2, characterized in that, A plurality of line passing plates (24) are further included, the line passing plate (24) comprises a main plate body (25), opposite sides of the main plate body (25) are provided with convex edges (26), line passing holes (27) are respectively formed in the convex edges (26), the main plate body (25) is installed on the mounting base (1), and the line loosening plate one (2) and the line loosening plate two (3) are movably connected to the main plate body (25) of the corresponding line passing plate (24).

6. A double threader device for stitch skipping according to claim 1 or 2 or 3, wherein, The reset member (14) comprises a spring or a rubber sleeve, one end of the spring is connected to the movable plate (18), the other end of the spring is connected to the mounting base (1), or one end of the rubber sleeve is connected to the movable plate (18), and the other end of the rubber sleeve is connected to the mounting base (1).

7. A double threader device for stitch skipping according to claim 1 or 2 or 3, characterized in that, A guide groove one (28) is formed in the line loosening plate one (2), fixed rods (29) are respectively arranged on the strong line clamp knob one (8) and the weak line clamp knob one (9), and the fixed rods (29) on the strong line clamp knob one (8) and the weak line clamp knob one (9) respectively pass through one guide groove one (28) and are fixed on the mounting base (1).

8. A double wire chopper device for stitch skipping as claimed in claim 1 or 2 or 3 wherein, A guide groove two (30) is formed in the line loosening plate two (3), fixed rods (29) are respectively arranged on the weak line clamp knob two (11), and the fixed rods (29) on the weak line clamp knob two (11) respectively pass through one guide groove two (30) and are fixed on the mounting base (1).

9. A waistband machine characterized by, The waistband machine comprises the double-row line clamp device for jump sewing according to any one of claims 1-8.

10. A waisting machine according to claim 9, wherein, In the double-row line clamp device, one group of strong line clamp knobs one (8) comprises four strong line clamp knobs one (8), one group of weak line clamp knobs one (9) comprises four weak line clamp knobs one (9), one group of strong line clamp knobs two (10) comprises four strong line clamp knobs two (10), and one group of weak line clamp knobs two (11) comprises four weak line clamp knobs two (11).

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