Rotary thread hooking structure of simple chain stitch

By designing the rotating thread hooking structure of the simple chain stitch, including the rotating thread hooking component, the left needle guard block and the right needle guard block, the problem of breakage and damage caused by the positional movement of the needle and thread body at high speeds is solved, achieving Efficient and reliable chain stitch forming.

CN222349287UActive Publication Date: 2025-01-14ZHEJIANG LEJIA ELECTRICAL MACHINERY
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Patent Information

Application Number
CN202323342987.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2023-12-08
Publication Date
2025-01-14
Estimated Expiration
2033-12-08

AI Technical Summary

Technical Problem

At high speed, the position movement between the needle and the thread body causes the thread body to break and the needle to break, affecting normal use and need to shut down for maintenance.

Method used

Design a simple chain stitch rotating hook structure, including a rotating hook component, a left needle guard block and a right needle guard block. These components protect the machine needle and the limit protection thread ring to ensure normal operation at high speeds. .

Benefits of technology

It achieves the stable production of chain stitches with upper single thread and lower double thread at high speed (up to 1500 rpm), reduces the occurrence of needle deflection and thread body breakage, and extends the service life of the equipment.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a simple chain stitch rotary thread hooking structure which comprises a shuttle race box body, a needle plate is fixed on the top of the shuttle race box body, a looping rotating shaft is movably installed in the middle of the shuttle race box body through a bearing, and the right end of the looping rotating shaft is located in a machining cavity formed in the middle of the right portion of the shuttle race box body. A shaft sleeve part of a rotary thread hooking part is fixed at the right end of the looping rotating shaft, the rotary thread hooking part is positioned in the processing cavity, the needle plate covers the top surface of the processing cavity, a middle through hole of the needle plate is vertically opposite to and communicated with the processing cavity, and the lower part of a machine needle above the needle plate penetrates through the middle through hole of the needle plate, extends into the processing cavity and is matched with the rotary thread hooking part. The rotating shuttle is simple in structure, can generate a chain stitch with a single thread at the upper part and double threads at the lower part, is reliable in stitch forming, can protect a machine needle and realize limiting protection on a descending thread ring due to the left needle protecting block and the right needle protecting block, ensures normal use, and meets the requirement of high-rotating-speed embroidery.
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Description

Technical field:

[0001] The utility model relates to the technical field of embroidery machines, and more specifically to a rotary thread hook structure for a simple chain stitch. Background technology:

[0002] Currently, the chain stitch embroidery machines in the embroidery machine field are composed of a special chain head with a 360-degree rotating hook needle inside, which cooperates with the 360-degree rotating shuttle and other components under the needle plate to realize chain embroidery. The chain stitch embroidery is double thread on the upper part and single thread on the lower part. The machine structure is very complicated.

[0003] The speed required for this model in the "QBT 4177-2011 Industrial Sewing Machine Computer-controlled Chain Stitch Embroidery Machine" is only 600 rpm. In fact, with the increase in customer demand and technological development, the working speed needs to reach about 1000 rpm. Due to the faster speed, the corresponding needle and thread will move left and right. When the position of the thread is not controlled, it will drive the lower part of the needle to descend and be hooked by the shuttle hook, causing the needle to deviate, resulting in problems such as thread breakage and needle damage, affecting normal use and requiring shutdown for repairs, which is very troublesome. Utility model content:

[0004] The purpose of the utility model is to combine the mature flat embroidery machine head, simplify the chain stitch forming process, and provide a simple chain stitch rotary hook structure. The rotary hook structure is simple, and can produce chain stitches with a single thread on the upper part and a double thread on the lower part. The stitch forming is reliable, and the left needle guard block and the right needle guard block can protect the machine needle and realize limit protection for the descending thread loop, thereby ensuring its normal use and meeting the needs of high-speed embroidery.

[0005] The solution of the utility model to solve the technical problem is:

[0006] A simple chain stitch rotary thread hooking structure comprises a shuttle bed box body, a needle plate is fixed on the top of the shuttle bed box body, a circle-forming rotating shaft is movably installed in the middle of the shuttle bed box body through a bearing, the right end of the circle-forming rotating shaft is in a processing cavity formed in the middle of the right part of the shuttle bed box body, a sleeve part of a rotary thread hooking component is fixed on the right end of the circle-forming rotating shaft, the rotary thread hooking component is in the processing cavity, the needle plate covers the top surface of the processing cavity, the middle through hole of the needle plate is opposite to and communicates with the processing cavity from top to bottom, and the lower part of the machine needle above the needle plate passes through the middle through hole of the needle plate and extends into the processing cavity And it cooperates with the rotating line hook component, the rotating line hook component includes a sleeve part, the right end face of the sleeve part is fixed or formed with a shuttle-shaped block, the right side wall of its upper part is an inclined wall extending obliquely from the middle part to the upper part to the left, the left side wall of its upper part is an inclined wall extending obliquely from the middle part to the upper part to the right, the top end of its upper part is formed with an upper hook part extending to the right and forward, the right side wall of its lower part is an inclined wall extending obliquely from the middle part to the lower part to the left, the left side wall of its lower part is a vertical wall, and the bottom end of its lower part is formed with a lower hook part extending backward.

[0007] The top surface of the sleeve part is formed with a mounting groove running through the left and right sides. The lower part of the left needle guard block is inserted into the mounting groove, and its bottom surface is pressed against the bottom surface of the mounting groove and is fixed to the sleeve part by bolts. The right side wall of the left needle guard block faces the lower left side wall of the needle, and the right part of the left needle guard block is in front of the upper part of the shuttle-shaped block.

[0008] A right needle guard block is provided at the upper portion of the right side of the shuttle-shaped block, and the front left side wall of the right needle guard block is close to the lower right side wall of the needle;

[0009] The top surface of the right end of the left needle guard block is formed with a raised limiting portion extending upward, and the right side wall of the raised limiting portion corresponds to the lower left side wall of the needle.

[0010] A rear protruding limiting portion extending rearward is formed in the middle of the rear wall surface of the shuttle-shaped block.

[0011] The outstanding effects of the utility model are:

[0012] The rotary hook has a simple structure and can produce chain stitches with a single thread on the upper part and double threads on the lower part. The stitch formation is reliable. The left and right needle guard blocks can protect the needle and limit the descending thread loop to ensure its normal use and meet the needs of high-speed embroidery. Description of the drawings:

[0013] Figure 1 It is a partial structural schematic diagram of the utility model;

[0014] Figure 2 It is a partial structural schematic diagram of the rotating line hooking component of the utility model;

[0015] Figure 3It is a schematic diagram of the local structure with a hook line angle of 200°;

[0016] Figure 4 yes Figure 3 Schematic diagram of the angle-changing local structure;

[0017] Figure 5 It is a schematic diagram of the local structure with a hook angle of 240°;

[0018] Figure 6 yes Figure 5 Schematic diagram of the angle-changing local structure;

[0019] Figure 7 It is a schematic diagram of the local structure with a hook angle of 20°;

[0020] Figure 8 yes Figure 7 Schematic diagram of the angle-changing local structure;

[0021] Fig. 9 It is a schematic diagram of the local structure with a hook angle of 135°;

[0022] Fig.10 yes Fig. 9 Schematic diagram of the angle-changing local structure;

[0023] Fig.11 It is a partial structural diagram of the hook angle of 178° when making the next stitch;

[0024] Fig.12 yes Fig.11 Schematic diagram of the angle-changing local structure;

[0025] Fig.13 It is a partial structural diagram of the hook thread angle when the next stitch is 200°;

[0026] Fig.14 yes Fig.13 Schematic diagram of the angle-changing local structure;

[0027] Fig.15 It is a partial structural diagram of the hook thread angle when the next stitch is 240°;

[0028] Fig.16 yes Fig.15 Schematic diagram of the angle-changing local structure;

[0029] Fig.17 It is a partial exploded schematic diagram of this embodiment and the connecting frame. Specific implementation method:

[0030] For example, see Figure 1 , Figures 2 to 17As shown, a simple chain stitch rotary hooking structure includes a shuttle bed box, a needle plate 3 is fixed on the top of the shuttle bed box, a circle-forming shaft 1 is movably installed in the middle of the shuttle bed box through a bearing, a lower shaft penetrating front and back is installed on the left side of the shuttle bed box, a gear is fixed in the middle of the lower shaft, which is located in the inner cavity at the left side of the shuttle bed box, and the left end of the circle-forming shaft 1 is also located in the inner cavity at the left side of the shuttle bed box and is fixed with a transmission gear, the transmission gear is meshed with the gear, and the lower shaft rotates to realize the rotation of the circle-forming shaft 1;

[0031] The right end of the loop-forming shaft 1 is in a processing cavity 100 formed in the middle of the right part of the shuttle bed box. The right end of the loop-forming shaft 1 is fixed with a sleeve portion of a rotating thread-hooking component 2. The rotating thread-hooking component 2 is in the processing cavity 100. The needle plate 3 covers the top surface of the processing cavity 100. The middle through hole of the needle plate 3 is opposite to and communicates with the processing cavity 100. The lower part of the machine needle 4 above the needle plate 3 passes through the middle through hole of the needle plate 3 and extends into the processing cavity 100 and cooperates with the rotating thread-hooking component 2. 2 comprises a shaft sleeve portion, a shuttle-shaped block 20 is fixed or formed on the right end surface of the shaft sleeve portion, the right side wall of the upper portion is an oblique wall extending obliquely from the middle portion to the upper portion to the left, the left side wall of the upper portion is an oblique wall extending obliquely from the middle portion to the upper portion to the right, the top end of the upper portion is formed with an upper hook portion 21 extending rightward and forward, the right side wall of the lower portion is an oblique wall extending obliquely from the middle portion to the lower portion to the left, the left side wall of the lower portion is a vertical wall, and the bottom end of the lower portion is formed with a lower hook portion 22 extending backward.

[0032] The top surface of the sleeve part is formed with a mounting groove running through the left and right sides. The lower part of the left needle guard block 5 is inserted into the mounting groove, and its bottom surface is pressed against the bottom surface of the mounting groove and is fixed to the sleeve part by bolts. The right side wall of the left needle guard block 5 faces the lower left side wall of the machine needle 4, and the right part of the left needle guard block 5 is in front of the upper part of the shuttle-shaped block 20.

[0033] A right needle guard block 6 is provided at the upper portion of the right side of the shuttle-shaped block 20, and the front left side wall of the right needle guard block 6 is close to the lower right side wall of the needle 4;

[0034] An extension connection portion 101 extending horizontally to the right is formed at the upper right side of the rear part of the right side wall of the shuttle bed box, and a second extension portion 102 extending to the right is formed at the front part of the right side wall of the shuttle bed box. A processing cavity 100 is formed between the extension connection portion 101 and the second extension portion 102, and the right end of the looping shaft 1 extends out of the middle part of the right side wall of the shuttle bed box;

[0035] The rear portion of the right needle guard block 6 is inserted into the mounting groove in the middle portion of the bottom surface of the extension connection portion 101 and is fixedly connected to the extension connection portion 101 by bolts.

[0036] A raised limiting portion 51 extending upward is formed on the top surface of the right end of the left needle guard block 5 , and the right side wall of the raised limiting portion 51 corresponds to the lower left side wall of the needle 4 .

[0037] A rear protruding limiting portion 23 extending rearward is formed in the middle of the rear wall surface of the shuttle-shaped block 20 .

[0038] The left needle guard block 5 and the right needle guard block 6 in this embodiment can protect the machine needle 4 and prevent the machine needle 4 from being touched by other surrounding objects or components and affecting its normal operation. An extended blocking portion extending upward is formed on the front of the left top surface of the right needle guard block 6, and the extended blocking portion is close to the lower right side wall of the machine needle 4. The left needle guard block 5 protects and limits the lower left side wall of the machine needle 4, and when the machine needle 4 pulls the thread loop down, the thread loop is blocked by the extended blocking portion of the right needle guard block 6 to prevent it from transitioning to the right, thereby ensuring that it can be accurately hooked and pulled by the upper hook portion 21 of the shuttle-shaped block 20 later, without deflecting the machine needle 4, ensuring its normal vertical up and down movement.

[0039] Furthermore, a raised limiting portion 51 extending upward is formed on the top surface of the right end of the left needle guard block 5 , and the right side wall of the raised limiting portion 51 corresponds to the lower left side wall of the needle 4 .

[0040] Furthermore, a rear protruding limiting portion 23 extending backward is formed in the middle of the rear wall surface of the rotating thread hooking component 2.

[0041] The chain stitch principle of this embodiment:

[0042] 1. See Figure 1 and Figure 2 As shown, the rotating thread hooking component 2 is 178°, the needle 4 is in the lower needle position, and the left needle guard block 5 is used to protect and limit the lower left side wall of the needle 4;

[0043] 2. See Figure 3 and Figure 4 As shown, the rotating thread hooking component 2 rotates to 200°, and the upper hook portion 21 coincides with the needle 4. The upper hook portion 21 cooperates with the needle 4, and the upper hook portion 21 rotates counterclockwise to hook the thread loop at the needle 4, while the thread loop is blocked by the right needle guard block 6 to prevent it from transitioning to the right;

[0044] 3. See Figure 5 and Figure 6 As shown, the rotating thread hooking component 2 rotates to 240°, the upper hook portion 21 hooks the thread loop and expands, the surface thread gradually wraps around the central axis, and the required thread amount increases;

[0045] 4. See Figure 7 and Figure 8As shown, the rotating thread hooking component 2 continues to rotate 140°, which is 20°240°+140°-360°=20°. At this time, the lower part of the rotating thread hooking component 2 is at the upper part, and it pushes the thread loop to the right;

[0046] 5. See Fig. 9 and Fig.10 As shown, the rotating thread hooking component 2 rotates to 135°, and the lower hook portion 22 of the rotating thread hooking component 2 continues to push the thread loop to the right, and at this time, the thread loop in the middle of the rotating thread hooking component 2 is stretched open;

[0047] 6. See Fig.11 and Fig.12 As shown, at this time, the rotating thread hooking component 2 rotates to 178°, and the thread loop of the previous needle is stretched open. At this time, the needle 4 of the next needle descends, and the thread loop of the second needle is inserted into the stretched position of the previous thread loop. At this time, the thread loop of the previous needle is clamped by the rear raised limiting portion 23 to achieve a pause;

[0048] 7. See Fig.13 and Fig.14 As shown, the rotating thread hooking component 2 rotates to 200° again, the upper hook portion 21 hooks the new thread loop, and the thread loop of the previous needle is sleeved on the thread loop of the new needle. At this time, the thread loop of the previous needle gradually detaches from the rotating thread hooking component 2 and moves upward;

[0049] 8. See Fig.15 and Fig.16 As shown, the rotating thread hook component 2 rotates to 240° again, the previous needle and thread loop is separated from the rotating thread hook component 2, and the new thread loop is gradually enlarged, tightening the previous needle and thread loop to form a chain stitch on the fabric 1000.

[0050] Follow this method to achieve chain stitch.

[0051] Due to the protection of the needle 4 by the left needle guard block 5 and the right needle guard block 6 and the limiting protection of the pulled-down thread loop, the embroidery machine installed in this embodiment can run at high speed, and the rotation speed of its loop shaft 1 can reach 1500 rpm, greatly improving the embroidery efficiency.

Claims

1. A simple chain stitch rotary thread hooking structure, comprising a shuttle bed box, a needle plate (3) is fixed on the top of the shuttle bed box, a circle-forming shaft (1) is movably mounted in the middle of the shuttle bed box through a bearing, the right end of the circle-forming shaft (1) is located in a processing cavity (100) formed in the middle of the right part of the shuttle bed box, a sleeve portion of a rotary thread hooking component (2) is fixed to the right end of the circle-forming shaft (1), the rotary thread hooking component (2) is located in the processing cavity (100), the needle plate (3) covers the top surface of the processing cavity (100), the middle through hole of the needle plate (3) is opposite to and communicates with the processing cavity (100) in the upper and lower parts, the lower part of the machine needle (4) above the needle plate (3) passes through the middle through hole of the needle plate (3) and extends into the processing cavity (100) and cooperates with the rotary thread hooking component (2), characterized in that: The rotating thread hooking component (2) comprises a shaft sleeve portion, the right end surface of which is fixed or formed with a shuttle-shaped block (20), the right side wall of the upper portion is an oblique wall extending obliquely from the middle portion to the upper portion to the left, the left side wall of the upper portion is an oblique wall extending obliquely from the middle portion to the upper portion to the right, the top end of the upper portion is formed with an upper hook portion (21) extending rightward and forward, the right side wall of the lower portion is an oblique wall extending obliquely from the middle portion to the lower portion to the left, the left side wall of the lower portion is a vertical wall, and the bottom end of the lower portion is formed with a lower hook portion (22) extending backward.

2. The rotary hooking structure of a simple chain stitch according to claim 1, characterized in that: The top surface of the shaft sleeve portion is formed with a mounting groove that passes through the left and right sides. The lower part of the left needle guard block (5) is inserted into the mounting groove, and its bottom surface is pressed against the bottom surface of the mounting groove and is fixedly connected to the shaft sleeve portion by bolts. The right side wall of the left needle guard block (5) faces the lower left side wall of the machine needle (4), and the right part of the left needle guard block (5) is located in front of the upper part of the shuttle-shaped block (20).

3. The rotary hooking structure of a simple chain stitch according to claim 1, characterized in that: A right needle guard block (6) is provided at the upper portion of the right side of the shuttle-shaped block (20), and the front left side wall of the right needle guard block (6) is close to the lower right side wall of the needle (4); An extension connection portion (101) extending horizontally to the right is formed at the upper right side of the rear part of the right side wall of the shuttle bed box, and a second extension portion (102) extending to the right is formed at the front part of the right side wall of the shuttle bed box, a processing cavity (100) is formed between the extension connection portion (101) and the second extension portion (102), and the right end of the loop forming shaft (1) extends out of the middle part of the right side wall of the shuttle bed box; The rear portion of the right needle guard block (6) is inserted into a mounting groove in the middle portion of the bottom surface of the extension connection portion (101) and is fixedly connected to the extension connection portion (101) by means of bolts.

4. The rotary hooking structure of a simple chain stitch according to claim 2, characterized in that: The top surface of the right end of the left needle guard block (5) is formed with a raised limiting portion (51) extending upward, and the right side wall of the raised limiting portion (51) corresponds to the lower left side wall of the needle (4).

5. The rotary hooking structure of a simple chain stitch according to claim 1, characterized in that: A rear protruding limiting portion (23) extending rearward is formed in the middle of the rear wall surface of the shuttle-shaped block (20).