Upper thread conveying device of sewing machine and sewing machine

Abstract

The utility model provides an upper thread conveying device of a sewing machine and the sewing machine, and belongs to the technical field of sewing equipment. The upper thread conveying device comprises a motor, a guide block and a rack, the rack is connected to the guide block in a sliding mode, a thread hooking part used for hooking threads is arranged on the rack, a gear is arranged on an output shaft of the motor, and the gear is meshed with the rack. The upper thread conveying device is simple in structure and very convenient to operate and maintain, the rack is driven by the gear to move, control is more accurate, thread winding is well achieved, and bird nests are prevented from appearing on fabric.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing equipment and relates to an upper thread conveying device of a sewing machine and a sewing machine. Background Art

[0002] After the sewing machine has finished sewing a piece of fabric, the bottom thread and the top thread need to be cut off before switching to another piece of fabric. If the top thread or the bottom thread is left too long, it will easily wrinkle and pile up at the seam start when the next piece of fabric is sewn, forming a ball of thread, similar to a bird's nest.

[0003] Patent document with application number 202321304134.3 discloses an anti-bird nest structure of a tacking machine, which includes a bracket, on which a cylinder and a pressing plate are arranged, a hook needle is installed on the piston rod of the cylinder one, the inner end of the pressing plate is fixed on the bracket, and the outer end of the pressing plate is abutted against the hook needle, a positioning platform is provided on the bracket, and the hook needle is located on the upper surface of the positioning platform. A heating wire is also provided on the bracket, and the heating wire is located below or in front of the lower positioning platform.

[0004] The above-mentioned anti-bird nest structure can prevent bird nests from forming on the surface line. However, designing different anti-bird nest structures is the direction of efforts of those skilled in the art. Summary of the invention

[0005] The utility model aims at the above problems existing in the prior art and provides an upper thread conveying device of a sewing machine. The technical problem to be solved by the utility model is: how to prevent bird nests from appearing on cloth.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A surface thread conveying device for a sewing machine, characterized in that the surface thread conveying device includes a motor, a guide block and a rack, the rack is slidably connected to the guide block, the rack has a thread hooking portion for hooking the thread, and a gear is provided on the output shaft of the motor, and the gear is meshed with the rack.

[0008] Its working principle is: the sewing machine includes a casing, and the upper thread conveying device is installed on the casing. The casing is provided with a needle bar, a thread take-up rod, a thread passing plate and a thread clamp. The sewing thread passes through the needle of the needle bar, the thread take-up rod, the thread passing plate, the thread hooking part of the rack and the thread clamp in sequence. During normal sewing, the upper thread conveying device is in a state of not taking up the thread.

[0009] When the thread needs to be reeled in, during the first few stitches after the sewing machine starts sewing, the thread is clamped by the thread clamp, and the motor drives the rack to move through the gear. At this time, the thread hooking part hooks out the excess thread left under the surface thread to achieve thread reeling, thereby effectively removing the bird's nest on the fabric near the needle.

[0010] The upper thread conveying device has a simple structure and is convenient to operate and maintain. The gear drives the rack to move, so the control is more precise, and the thread collection is well achieved to prevent the formation of bird nests on the fabric.

[0011] In the above-mentioned surface thread conveying device of a sewing machine, a slide groove is provided on the guide block, the rack is slidably connected in the slide groove, and the top and bottom of the rack are respectively against the upper wall and lower wall of the slide groove.

[0012] In this structure, the slide groove plays a good guiding role for the rack, improving the stability of the rack when it moves. The guide block hides most of the rack, which plays a dust-proof role for the rack, makes it more beautiful, and improves safety.

[0013] In the above-mentioned upper thread conveying device of a sewing machine, a receiving groove is provided at the bottom of the guide block, and the gear is located in the receiving groove.

[0014] The guide block protects the gears by hiding most of the gears, and also protects the gears from dust, while improving safety.

[0015] In the above-mentioned upper thread conveying device of a sewing machine, the thread hooking portion includes a boss extending outwardly, the boss is located on the outer side of the rack, and the boss has a through hole for the upper thread to pass through.

[0016] During normal sewing, the thread hooking part is located at the thread passing plate, and the thread passes through the thread passing hole on the thread passing plate and the through hole on the boss in turn. When the thread needs to be hooked, the motor drives the rack to move through the gear to pull the thread in the through hole on the boss outward to achieve thread collection.

[0017] In the above-mentioned upper thread conveying device of a sewing machine, a clearance groove for the boss to pass through is arranged on the outer side of the guide block, and the clearance groove is communicated with part of the slide groove.

[0018] When the rack moves, the boss slides in the clearance groove to avoid interference between the guide block and the boss.

[0019] In the above-mentioned upper thread conveying device of a sewing machine, the guide block is provided with a mounting hole for the screw to pass through, and the mounting hole penetrates the guide block along the thickness direction.

[0020] The screws pass through the mounting holes and are threadedly connected to the housing. This structure greatly improves the convenience of installation.

[0021] The utility model also provides a sewing machine, which comprises any one of the above-mentioned surface thread conveying devices.

[0022] Compared with the prior art, the advantages of the utility model are as follows:

[0023] 1. The upper thread conveying device has a simple structure and is easy to operate and maintain. The gear drives the rack to move, which makes the control more precise and realizes the thread collection well, preventing bird nests from appearing on the fabric.

[0024] 2. In the surface thread conveying device, the guide block plays a good guiding role on the rack, improving the stability of the rack when it moves. The guide block hides most of the rack, which plays a dust-proof role for the rack, makes it more beautiful, and improves safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the upper thread conveying device;

[0026] Figure 2 It is a structural schematic diagram of the guide block;

[0027] Figure 3 is a schematic diagram of the upper thread conveying device being installed on a sewing machine;

[0028] Figure 4 yes Figure 3 Enlarged view of part A in .

[0029] In the figure: 1 motor, 2 guide block, 3 rack, 4 thread hook part, 5 gear, 6 slide groove, 7 receiving groove, 8 boss, 9 through hole, 10 give way groove, 11 mounting hole, 12 housing, 13 needle bar, 14 thread take-up lever, 15 thread passing plate, 16 thread clamp. DETAILED DESCRIPTION

[0030] The following are specific embodiments of the present invention, and the technical solution of the present invention is further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0031] like Figure 1 As shown, the surface thread conveying device includes a motor 1, a guide block 2 and a rack 3, the rack 3 is slidably connected to the guide block 2, the rack 3 has a thread hooking portion 4 for hooking the thread, and a gear 5 is arranged on the output shaft of the motor 1, and the gear 5 is meshed with the rack 3.

[0032] like Figure 3 and 4 As shown, the sewing machine includes a casing 12, and a surface thread conveying device is installed on the casing 12. A needle bar 13, a thread take-up rod 14, a thread passing plate 15 and a thread clamp 16 are provided on the casing 12. The sewing thread passes through the needle of the needle bar 13, the thread take-up rod 14, the thread passing plate 15, the thread hooking part 4 of the rack 3 and the thread clamp 16 in sequence. During normal sewing, the surface thread conveying device is in a state of not taking up the thread.

[0033] When it is necessary to reel in the thread, during the first few stitches after the sewing machine starts sewing, the thread is clamped by the thread clamp 16, and the motor 1 drives the rack 3 to move through the gear 5. At this time, the thread hooking part 4 hooks out the excess thread left under the surface thread to achieve thread reeling, thereby effectively removing the bird's nest on the fabric near the needle.

[0034] The upper thread conveying device has a simple structure and is convenient to operate and maintain. The gear 5 drives the rack 3 to move, and the control is more precise, so that the thread collection can be well achieved and bird nests can be prevented from appearing on the fabric.

[0035] like Figure 1 As shown, in this embodiment, a slide groove 6 is provided on the guide block 2, and the rack 3 is slidably connected in the slide groove 6, and the top and bottom of the rack 3 are respectively against the upper wall and the lower wall of the slide groove 6.

[0036] In this structure, the slide groove 6 plays a good guiding role on the rack 3, improving the stability of the rack 3 when moving. The guide block 2 hides most of the rack 3, plays a dust-proof role for the rack 3, is more beautiful, and improves safety.

[0037] like Figure 1 and 2 As shown, in this embodiment, a receiving groove 7 is provided at the bottom of the guide block 2 , and the gear 5 is located in the receiving groove 7 .

[0038] The guide block 2 protects the gear 5, hides most of the gear 5, and also prevents the gear 5 from dust, while improving safety.

[0039] like Figure 1 As shown, in this embodiment, the thread hooking portion 4 includes a boss 8 extending outwardly, the boss 8 is located on the outer side of the rack 3, and the boss 8 has a through hole 9 for the surface thread to pass through.

[0040] like Figure 4 As shown, during normal sewing, the thread hooking portion 4 is located at the thread passing plate 15, and the suture passes through the thread passing hole on the thread passing plate 15 and the through hole 9 on the boss 8 in sequence. When the thread needs to be hooked, the motor 1 drives the rack 3 to move through the gear 5, and pulls the suture in the through hole 9 on the boss 8 outward to achieve thread winding.

[0041] like Figure 2 As shown, in this embodiment, a clearance groove 10 for the boss 8 to pass through is arranged on the outer side of the guide block 2, and the clearance groove 10 is communicated with a part of the slide groove 6.

[0042] When the rack 3 moves, the boss 8 slides in the clearance groove 10 to avoid interference between the guide block 2 and the boss 8.

[0043] like Figure 1 As shown, in this embodiment, the guide block 2 is provided with a mounting hole 11 for the screw to pass through, and the mounting hole 11 penetrates the guide block 2 along the thickness direction.

[0044] The screw passes through the mounting hole 11 and is threadedly connected to the housing 12. This structure greatly improves the convenience of installation.

[0045] The utility model also provides a sewing machine, which comprises any one of the above-mentioned surface thread conveying devices.

[0046] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A needle thread conveying device for a sewing machine, characterized in that: The surface thread conveying device comprises a motor (1), a guide block (2) and a rack (3); the rack (3) is slidably connected to the guide block (2); the rack (3) has a thread hooking portion (4) for hooking a thread; a gear (5) is arranged on the output shaft of the motor (1); the gear (5) is meshed with the rack (3).

2. The upper thread conveying device of a sewing machine according to claim 1, characterized in that: The guide block (2) is provided with a slide groove (6), the rack (3) is slidably connected in the slide groove (6), and the top and bottom of the rack (3) are respectively against the upper wall and lower wall of the slide groove (6).

3. The upper thread conveying device of a sewing machine according to claim 2, characterized in that: The bottom of the guide block (2) is provided with a receiving groove (7), and the gear (5) is located in the receiving groove (7).

4. The upper thread conveying device of a sewing machine according to claim 2 or 3, characterized in that: The thread hooking portion (4) comprises a boss (8) extending outwards, the boss (8) is located outside the rack (3), and the boss (8) has a through hole (9) for the surface thread to pass through.

5. The upper thread conveying device of a sewing machine according to claim 4, characterized in that: The outer side of the guide block (2) is provided with a clearance groove (10) for the boss (8) to pass through, and the clearance groove (10) is connected to a part of the slide groove (6).

6. The upper thread conveying device of a sewing machine according to claim 1, 2 or 3, characterized in that: The guide block (2) is provided with a mounting hole (11) for a screw to pass through, and the mounting hole (11) penetrates the guide block (2) in the thickness direction.

7. A sewing machine, characterized in that: The sewing machine comprises a surface thread conveying device as described in any one of claims 1-6.

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