Thread loosening device for sewing machine

Abstract

The utility model discloses a thread loosening device for a sewing machine, and relates to the field of sewing machines. The thread loosening device comprises an installation plate and a thread clamping disc, a thread loosening mechanism is installed on the installation plate, the thread loosening mechanism comprises two sets of brackets and an installation frame, and a plurality of supporting pieces are fixedly arranged on the inner sides of the brackets. The bracket and the supporting pieces on the bracket are driven to move relatively, the moving process directly acts on the wire clamping discs, so that gaps between the wire clamping discs are gradually enlarged, the wire loosening effect is achieved, meanwhile, in the wire loosening process, the bracket stably supports the wire clamping discs, multi-point shifting operation on the wire clamping discs is achieved through movement of the bracket, and the wire loosening effect is improved. Compared with the traditional single-point shifting, the multi-point shifting has the advantages that the two groups of thread clamping discs can be separated more comprehensively, the probability of thread breakage is effectively reduced, and the use convenience and the working efficiency of the sewing machine are remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing machine field, concretely is a thread loosening device for sewing machine. BACKGROUND

[0002] The thread loosening device of sewing machine is the key part of adjusting the tightness of sewing thread, and it realizes the timely relaxation of sewing thread through mechanical, electromagnetic or pneumatic mode, ensures the smooth sewing and the beauty of stitch, and different types of thread loosening devices have their own characteristics and application scenarios, and the tightness of sewing thread can be changed by adjusting relevant parameters.

[0003] After examination, the announcement number: CN202007317U, the pneumatic thread loosening device of overlock machine, the announcement number: CN216891502U, a thread loosening device of sewing machine, the announcement number: CN207091677U, a thread loosening device of sewing machine, for the above three comparative documents, its general principle is to use the form of pneumatic mechanism and the paddle to drive the thread clamp, so as to expand the gap between the two thread clamps, so as to realize the thread loosening effect, but in the actual use process, the inventor finds that there are more serious problems in the above three comparative documents, specifically, the paddle form in the above three comparative documents drives the single side of the thread clamp, and in the driving process, because there is an installation cooperation gap between the two thread clamps, the gap on the side close to the paddle of the two thread clamps is larger, and the gap on the side away from the paddle is smaller, wherein the thread loosening is not complete, and the thread breaking easily occurs, secondly, the repeated friction between the paddle and the thread clamp can cause serious friction damage to the paddle and the thread clamp, and the loss of the sewing machine is increased. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the utility model aims at providing a thread loosening device for sewing machine to solve the technical problem that the traditional thread loosening device is difficult to separate the two thread clamps completely.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a thread loosening device for sewing machine, comprising a mounting plate and a thread clamp, the mounting plate is provided with a thread loosening mechanism, the thread loosening mechanism comprises two groups of brackets and a mounting frame, a plurality of supporting pieces are fixedly arranged on the inner side of the bracket, the two groups of brackets are fixedly connected through a connecting piece, the mounting frame is provided with a driving part, the telescopic end of the driving part is drivingly connected with a traction rod, and the other end of the traction rod is fixedly connected with the connecting piece.

[0006] Through the above technical scheme, the thread clamp of the sewing machine is fixed by the mounting plate, the structure is stable and reliable, the thread loosening mechanism realizes the effective control of the thread clamp, the plurality of supporting pieces fixed on the inner side of the bracket abut against the inner side of the thread clamp, and the stability and accuracy in the thread loosening process are ensured.

[0007] Further, the support pieces are arranged in equidistant annular arrangement, and the support pieces abut against the inner side of the thread clamp.

[0008] By adopting the above technical scheme, the contact between the support piece and the inner side of the thread clamp is more uniform, effectively avoiding the position deviation of the thread clamp caused by excessive local stress.

[0009] Further, one side of the bracket is in open structure, forming a through opening for mounting the bracket on the outer side of the thread clamp.

[0010] By adopting the above technical scheme, one side of the bracket is in open structure, making the mounting and dismounting of the bracket more convenient and efficient, improving the maintenance efficiency, and at the same time, the open structure design provides more space for the installation and debugging of the thread clamp, making the operation more flexible.

[0011] Further, the mounting bracket is fixedly connected with the mounting plate, the mounting bracket is in "L" shape structure, and the driving member is in detachable connection structure with the mounting bracket.

[0012] By adopting the above technical scheme, the stability and firmness of the thread loosening mechanism are ensured, so that the sewing machine can maintain stable thread loosening effect during operation, and the "L" shaped mounting bracket not only saves space, but also improves the installation flexibility, making the thread loosening device more suitable for different models of sewing machines.

[0013] Further, an adjusting sleeve is threadedly connected to the traction rod to adjust the length of the traction rod and limit the movement range of the bracket.

[0014] By adopting the above technical scheme, the user can adjust the length of the traction rod according to the actual needs, thereby limiting the movement range of the bracket, which not only improves the adaptability of the thread loosening device, but also makes the thread loosening operation more accurate and controllable.

[0015] Further, an adjusting knob is arranged on one side of the thread clamp, and a pressure spring is elastically mounted between the adjusting knob and the thread clamp.

[0016] By adopting the above technical scheme, the user can flexibly adjust the clamping force of the thread clamp on the sewing thread according to the material and thickness of the sewing thread, which not only improves the applicability of the sewing machine, but also ensures the stable transmission and sewing effect of the sewing thread.

[0017] Further, a plurality of friction teeth are arranged in equidistant annular arrangement on the outer side of the adjusting knob and the adjusting sleeve.

[0018] By adopting the above technical scheme, the friction teeth increase the friction force in the adjusting process, so that the user can rotate the adjusting knob or the adjusting sleeve more labor-saving and stably, which not only improves the convenience of operation, but also avoids the problem of inaccurate adjustment caused by sliding or loosening.

[0019] In summary, the utility model mainly has the following beneficial effects:

[0020] 1、 the utility model discloses a line loosening mechanism, and the drive part in line loosening mechanism carries out telescopic motion, and this movement is effectively passed to two groups of brackets through traction rod and connecting sheet, and the relative movement of bracket and the support sheet on it is driven, and this moving process directly acts on the thread clamp, makes the gap between the thread clamp gradually expand, thereby realizes the line loosening effect, and simultaneously, in the line loosening process, the bracket not only provides stable support to the thread clamp, but also realizes the multi-point dialing operation of the thread clamp through its movement, and compared with the traditional single-point dialing, this multi-point dialing can more comprehensively separate the two groups of thread clamps, effectively reduces the probability of thread breakage, significantly improves the use convenience and working efficiency of the sewing machine, and simultaneously, compared with the traditional single-point dialing form, is favorable for reducing the friction degree between structures, reducing the friction damage in the use process, and improving the service life of the thread loosening device and the thread clamp.

[0021] 2、 the utility model discloses through the rotation adjusting sleeve, can change the length of adjusting traction rod, and this adjusting process directly influences the transmission effect of traction rod to connecting sheet and bracket, and simultaneously, the change of the length of traction rod further restricts the activity range of bracket, so that the moving distance of bracket when the drive part telescopic motion is accurately controlled, and this fine adjusting mechanism makes us can accurately adjust the gap size between thread clamps according to actual demand, realizes the fine control of the line loosening degree, and improves the operation flexibility and sewing effect of the sewing machine. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the three-dimensional structure schematic diagram of the utility model;

[0023] Figure 2 It is the overhead structure schematic diagram of the utility model;

[0024] Figure 3 It is the three-dimensional structure schematic diagram of the line loosening mechanism of the utility model;

[0025] Figure 4 It is the side view structure schematic diagram of the line loosening mechanism of the utility model.

[0026] In the drawing: 1, mounting plate;2, thread clamp;3, adjusting knob;4, line loosening mechanism;401, bracket;402, support sheet;403, mounting frame;404, drive part;405, traction rod;406, adjusting sleeve;407, connecting sheet;5, pressure spring. DETAILED DESCRIPTION

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0028] Example 1:

[0029] A thread-releasing device for a sewing machine, such as Figures 1-4 As shown, the sewing machine includes a mounting plate 1 and a thread clamping plate 2. A thread loosening mechanism 4 is mounted on the mounting plate 1. The thread loosening mechanism 4 includes two sets of brackets 401 and a mounting frame 403. Several support pieces 402 are fixedly arranged on the inner side of the brackets 401. The two sets of brackets 401 are fixedly connected by connecting pieces 407. A driving component 404 is mounted on the mounting frame 403. The telescopic end of the driving component 404 is connected to a traction rod 405. The other end of the traction rod 405 is fixedly connected to the connecting piece 407. The mounting plate 1 is used to fix the thread clamping mechanism of the sewing machine. The components are structurally stable and reliable. The thread loosening mechanism 4 effectively controls the thread clamping disc 2. Several support plates 402 fixed inside the bracket 401 abut against the inside of the thread clamping disc 2, ensuring stability and accuracy during the thread loosening process. At the same time, the drive component 404 is connected to the connecting plate 407 through the traction rod 405, realizing precise drive of the bracket 401. This makes the thread loosening operation more flexible and efficient, which not only improves the working efficiency of the sewing machine, but also reduces the difficulty of operation and enhances the user experience.

[0030] See Figure 3 , Figure 4 Several support plates 402 are arranged in an equidistant ring, and the support plates 402 abut against the inner side of the wire clamping plate 2, making the contact between the support plates 402 and the inner side of the wire clamping plate 2 more uniform. This effectively avoids the displacement of the wire clamping plate 2 caused by excessive local force. At the same time, the abutment between the support plates 402 and the inner side of the wire clamping plate 2 provides stable support for the wire loosening process, ensuring the smoothness and reliability of the wire loosening operation. This equidistant ring arrangement design not only improves the structural strength of the wire loosening device, but also extends its service life and reduces maintenance costs.

[0031] See Figure 3 , Figure 4 One side of the bracket 401 has an open structure, forming a passage for the bracket 401 to be installed on the outside of the wire clamping plate 2. The open structure on one side of the bracket 401 makes the installation and disassembly of the bracket 401 more convenient and quick, improving maintenance efficiency. At the same time, the open structure design also provides more space for the installation and debugging of the wire clamping plate 2, making the operation more flexible. In addition, it also helps to reduce the friction between the bracket 401 and the wire clamping plate 2, reducing wear and noise, and improving the overall performance of the wire loosening device.

[0032] SeeFigure 1 、 Figure 2 , The mounting frame 403 is fixedly connected with the mounting plate 1, the mounting frame 403 is in the "L" shape structure, the driving part 404 is in the detachable connection structure with the mounting frame 403, the stability and the firmness of the thread loosening mechanism are ensured, the thread loosening effect of the sewing machine can be kept stable during the working process, simultaneously, the mounting frame 403 in the "L" shape structure not only saves the space, but also improves the installation flexibility, so that the thread loosening device is more suitable for different models of sewing machines, in addition, the detachable connection structure of the driving part 404 and the mounting frame 403 facilitates the user to replace or repair according to the actual demand, and reduces the use cost.

[0033] Embodiment two:

[0034] Referring to Figure 3 、 Figure 4 , the adjusting sleeve 406 is screw-connected on the traction rod 405, so as to adjust the length size of the traction rod 405, the activity range of the bracket 401 is limited, so that the user can adjust the length size of the traction rod 405 according to the actual need, thereby limiting the activity range of the bracket 401, not only the adaptability of the thread loosening device is improved, but also the thread loosening operation is more accurate and controllable, simultaneously, the screw connection structure of the adjusting sleeve 406 ensures the stability and reliability of the adjusting process, avoids the problem of unstable thread loosening effect caused by loosening or sliding, not only improves the working efficiency of the sewing machine, but also improves the market competitiveness of the product.

[0035] Referring to Figure 1 、 Figure 2 , the adjusting knob 3 is arranged on one side of the thread clamp 2, the pressure spring 5 is elastically mounted between the adjusting knob 3 and the thread clamp 2, so that the user can flexibly adjust the clamping force of the thread clamp 2 on the sewing thread according to the material and thickness of the sewing thread, not only the applicability of the sewing machine is improved, but also the stable transmission and sewing effect of the sewing thread are ensured, simultaneously, the pressure spring 5 elastically mounted between the adjusting knob 3 and the thread clamp 2 provides the thread clamp 2 with continuous clamping force, avoids the problem of sewing thread falling off or mispositioning caused by loosening or vibration, not only improves the stability and reliability of the sewing machine, but also prolongs its service life.

[0036] Referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4The adjusting knob 3 and the outer side of the adjusting sleeve 406 are annularly arranged with a plurality of friction teeth, which increase the friction during the adjusting process, so that the user can rotate the adjusting knob 3 or the adjusting sleeve 406 more labor-saving and stably, not only improve the convenience of operation, but also avoid the problem of inaccurate adjustment caused by sliding or loosening, meanwhile, the friction teeth also provide additional support and fixing effect for the adjusting knob 3 and the adjusting sleeve 406, enhance the structural strength and stability, not only improve the overall performance of the line loosening device, but also improve the user's experience.

[0037] The principle of the embodiment is that the device fixes the thread clamping components of the sewing machine through the mounting plate 1, the thread clamping disc 2 is used for clamping the sewing thread, when the thread needs to be loosened, the thread loosening mechanism 4 starts to work, the driving part 404 in the thread loosening mechanism 4 extends and retracts, drives the two groups of brackets 401 and supporting plates 402 to move relatively through the traction rod 405 and the connecting plate 407, so as to expand the gap between the two thread clamping discs 2, realize the thread loosening effect, and support the thread clamping disc 2 by the bracket 401 during the thread loosening process, and move the position of the thread clamping disc 2, so as to realize the multi-point operation of the thread clamping disc 2, compared with the traditional single-point operation, it is beneficial to make the two groups of thread clamping discs 2 separate completely, reduce the probability of traditional thread breaking, improve the use convenience of the sewing machine, meanwhile, the pressure spring 5 between the adjusting knob 3 and the thread clamping disc 2 can adjust the clamping force of the thread clamping disc 2 on the sewing thread according to the need, and the length of the traction rod 405 can also be accurately adjusted by rotating the adjusting sleeve 406, so as to limit the activity range of the bracket 401, realize the fine control of the thread loosening degree.

[0038] Although the embodiments of the utility model have been shown and described, the specific embodiments are only an explanation of the utility model, and are not a limitation of the utility model, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable way, and the person skilled in the art can make non-creative contribution modification, replacement and change of the embodiments according to the need after reading the specification without departing from the principles and purposes of the utility model, but as long as in the utility model's claim range, it is protected by the patent law.

Claims

1. Thread loosening device for a sewing machine, characterized in that: The utility model relates to a thread tensioning device, including installation plate (1), thread tensioning disc (2), the installation plate (1) is installed with thread tensioning mechanism (4), the thread tensioning mechanism (4) includes two groups of bracket (401) and mounting frame (403), the inside fixedly provided with a plurality of support piece (402) of bracket (401), two groups of bracket (401) are fixedly connected through connecting sheet (407), mounting frame (403) is installed with drive part (404), the telescopic end transmission of drive part (404) is connected with traction rod (405), the other end of traction rod (405) is fixedly connected with connecting sheet (407).

2. Thread loosing device for a sewing machine according to claim 1, characterized in that: A plurality of support pieces (402) are arranged in equidistant annular arrangement, and the support pieces (402) abut against the inner side of the thread tensioning disc (2).

3. Thread loosing device for a sewing machine according to claim 1, characterized in that: The bracket (401) is open on one side, forming an opening through which the bracket (401) is mounted on the outer side of the thread tensioning disc (2).

4. Thread loosing device for a sewing machine according to claim 1, characterized in that: The mounting frame (403) is fixedly connected with the installation plate (1), and the mounting frame (403) is in the form of an "L".

5. Thread loosing device for a sewing machine according to claim 1, characterized in that: An adjusting sleeve (406) is threadedly connected to the traction rod (405) to adjust the length of the traction rod (405) and limit the range of movement of the bracket (401).

6. Thread loosing device for a sewing machine according to claim 1, characterized in that: An adjusting knob (3) is arranged on one side of the thread tensioning disc (2), and a pressure spring (5) is elastically arranged between the adjusting knob (3) and the thread tensioning disc (2).

7. Thread loosing device for a sewing machine according to claim 6, characterized in that: A plurality of friction teeth are arranged in equidistant annular arrangement on the outer side of the adjusting knob (3) and the adjusting sleeve (406).

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