Automatic thread trimming mechanism for refitted small end of computerized pattern sewing machine
By improving the structure of the automatic wire cutting device of the computer prototype, using cylinder drive and compact design, the problem of transmission instability is solved, and stable wire cutting in a narrow space is achieved, which reduces maintenance costs and improves sewing accuracy and efficiency.
Patent Information
- Application Number
- CN202421940752.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-08-12
AI Technical Summary
The existing computer model automatic wire cutting device has unstable transmission in a narrow sewing space, which can easily lead to equipment failure or jamming, making it difficult to meet the requirements of narrow sewing space and high transmission stability.
An automatic thread cutting mechanism including needle plate, movable knife, fixed knife, rotary shaft, thread cutting cylinder assembly and tie rod is designed. It adopts cylinder drive. The thread cutting groove is designed as a U-shaped, V-shaped or circular arc groove. The thread cutting blade and the fixed knife are used to cut the wire, which is compact and easy to install and maintain.
It realizes stable thread cutting in a narrow space, reduces maintenance costs, improves sewing accuracy and efficiency, adapts to diversified sewing needs, and avoids failure of surface thread acquisition.
Smart Images
Figure CN223255645U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of embroidery machines, in particular to an automatic thread trimming mechanism for a modified small head of a computer pattern machine. Background Art
[0002] In the computerized pattern machine industry, thread trimming is required after the embroidery unit is completed. Existing computerized pattern machines consist of a machine head, a thread-locking mechanism, and a thread trimmer. The latter is responsible for thread trimming. A needle pulls the upper thread through the fabric, where the rotary shuttle picks up and separates the thread, forming a loop and knotting it. Scissors then cut a strand of upper and lower thread, leaving a thread end beneath the fabric.
[0003] Automatic thread trimmers are an essential component of computerized pattern machines. Through the close coordination of a series of precision components, they enable automatic thread trimming, significantly reducing worker workload and improving production efficiency. However, existing automatic thread trimmers for computerized pattern machines primarily consist of a drive shaft, a drive cam secured to the shaft, a movable knife assembly, and a thread trimming drive mechanism that drives the movable knife assembly. During operation, the thread trimming drive mechanism and the drive cam work together to enable the movable knife assembly to complete the thread trimming process.
[0004] However, the transmission method of the existing movable knife assembly and thread trimmer drive mechanism is not suitable for narrow sewing spaces, and there are instability issues during the transmission process, which can easily lead to equipment failure or jamming. To address these problems, it is necessary to improve this type of automatic thread trimmer device to meet the requirements of narrow sewing spaces and high transmission stability. Utility Model Content
[0005] Aiming at the problems existing in the prior art, the utility model proposes a computer pattern machine modified small head
[0006] An automatic thread trimming mechanism is used. The automatic thread trimming mechanism has a simple structure, high stability during long-term operation, uses fewer parts, occupies a small space, and is easy to install and repair considering the later maintenance costs, thereby greatly reducing the use and maintenance costs.
[0007] The utility model is realized through the following technical solutions:
[0008] An automatic thread trimming mechanism for a small head modified for a computerized pattern machine, characterized in that it includes a needle plate 21, a small needle plate 22, a needle plate hole 221, a movable knife 23, a fixed knife 24, a rotating shaft 25, a thread trimming cylinder joint 27, a pull rod 28, and a thread trimming cylinder assembly 29; the needle plate 21 is in direct contact with the object to be processed on the front side of the needle plate 21, and the small needle plate 22 is embedded in a circular countersunk hole at one end of the needle plate 21;
[0009] One end of the movable knife 23 is provided with a thread cutting groove 231, and the other end is provided with a rotation positioning hole 234 and a driving shaft 26; the rotating shaft 25 passes through the rotation positioning hole 234 to rotatably mount the movable knife 23 on the back of the needle plate 21;
[0010] The trimming cylinder assembly 29 is rotatably connected to one end of the pull rod 28 via a trimming cylinder joint. The other end of the pull rod 28 is rotatably connected to the drive shaft 26. When the trimming cylinder assembly 29 contracts, it simultaneously drives one end of the pull rod 28 to contract. At this point, the other end of the pull rod 28, via the drive shaft 26, drives the movable knife 23 to rotate about the rotation axis 25 toward the fixed knife 24. During this rotation, the trimming groove 231 of the movable knife 23 forks the bottom and top threads to be cut and continues to move toward the fixed knife 24. When the movable knife 23 and the fixed knife 24 overlap, the trimming groove 231 of the movable knife and the blade of the fixed knife work together to cut the bottom and top threads.
[0011] Preferably, when the trimming cylinder assembly 29 is extended, it drives one end of the pull rod 28 to move synchronously. At this time, the other end of the pull rod 28 drives the movable knife 23 to rotate around the rotating axis 25 away from the fixed knife 24 through the push shaft 26 until it returns to its original position.
[0012] Preferably, the wire cutting groove 231 may be a U-shaped groove, a V-shaped groove or an arc groove.
[0013] As a preference, the movable knife 23 further includes a cutting end face 232 and a groove 233. The movable knife 23 is provided with a cutting end face 232 at the movable knife cutting end facing the fixed knife 24. The cutting end face 232 is provided with a groove extending to the cutting end face 232.
[0014] The groove 233 of 231 divides the thread cutting end surface 232 into two upper and lower areas. In this way, when the movable knife moves toward the fixed knife, the bottom thread and the top thread to be cut will be gathered in this groove, and the groove leaves space for the embroidery thread. In this way, the embroidery thread has room to stretch in the groove and will not be taut, thus preventing the embroidery thread from being cut prematurely after the movable knife contacts the fixed knife.
[0015] Preferably, the fixed knife 24 includes a blade 241 provided at its front end and a positioning U-groove 242 at its rear end.
[0016] Preferably, a needle plate hole 221 is provided at the center of the small needle plate 22 .
[0017] Preferably, the distance between the intersection point of the thread cutting end surface 232 of the movable knife 23 and the fixed knife blade 241 and the center of the needle plate hole 221 is 2-3.5 mm.
[0018] The utility model has the following beneficial effects:
[0019] The invention discloses an automatic thread trimming mechanism for a small head modified for a computerized pattern machine. Based on a minor improvement on the existing thread trimming device of an embroidery machine, the invention solves the problem of long bottom thread ends remaining on the reverse side of the fabric after the existing thread trimming device has cut the thread.
[0020] The telescopic cylinder structure is adopted, and the overall thread trimming structure space is smaller, which can make the size of the entire front nozzle smaller, so that our automatic thread trimming mechanism can easily cope with the vast majority of narrow semi-finished products that require fine sewing.
[0021] Furthermore, the blade mounting area in this solution also allows for ample adjustment to meet diverse needs. A thread divider has been cleverly incorporated within the shuttle hook, allowing for precise adjustment to the optimal position through the flexible movement of the small mouth cover. This innovative design ensures perfect coordination between the shuttle and needle during thread hooking, resulting in more precise and efficient sewing results.
[0022] The blade installation of this solution has space that can be adjusted according to actual conditions. There is a wire splitter inside the shuttle bed positioning hook, and its optimal position can be adjusted by moving the small mouth cover.
[0023] To ensure the best hooking of the shuttle bed and the needle.
[0024] This embodiment does not require changing the embroidery operation sequence of the existing embroidery machine, and the improved embroidery machine thread trimming device can be directly put into use; although the latter embodiment requires changing the embroidery operation sequence of the embroidery machine, it can greatly improve the reliability of the embroidery machine thread trimming operation and avoid the occurrence of upper thread hooking failure. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 This is an overall schematic diagram of the installation position of the automatic thread trimming mechanism for the small head of the computer pattern machine modified in the utility model;
[0026] Figure 2 This is an enlarged schematic diagram of the structure of the automatic thread trimming mechanism for the small head of the computer pattern machine modified in this utility model
[0027] Figure 3 This is the structural principle diagram of the automatic thread trimming mechanism for the small head of the computerized pattern machine modified in this utility model;
[0028] Figure 4 This is a structural diagram of the movable knife in the automatic thread trimming mechanism for the small head of the computerized pattern machine modified in the present utility model;
[0029] Figure 5 This is a structural diagram of the fixed knife in the automatic thread trimming mechanism for the small head of the computerized pattern machine modified in the present utility model;
[0030] Among them, the meanings of the accompanying numbers are as follows: 1. machine head; 2. thread trimming mechanism; 21. needle plate; 22. small needle plate; 221. needle plate hole; 23. movable knife; 231. thread trimming groove (V / U type); 232. thread trimming end face; 233. groove; 234. rotation positioning hole; 24. fixed knife; 24. fixed knife; 241. fixed knife blade; 242. positioning U groove; 25. rotating shaft; 26. driving shaft; 27. thread trimming cylinder joint; 28. pull rod; 29. thread trimming cylinder assembly; 3. shuttle bed; 4. machine base. DETAILED DESCRIPTION
[0031] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
[0032] like Figure 1-5 As shown, an automatic thread trimming mechanism for a small head of a computerized pattern machine is modified, comprising a needle plate 21, a small needle plate 22, a needle plate hole 221, a movable knife 23, a fixed knife 24, a rotating shaft 25, a thread trimming cylinder joint 27, a pull rod 28, a thread trimming cylinder assembly 29, and the needle plate 21 having the front side of the needle plate 21 in direct contact with the object to be processed. The small needle plate 22 is embedded in a circular countersunk hole at one end of the needle plate 21.
[0033] One end of the movable knife 23 is provided with a thread cutting groove 231, and the other end is provided with a rotation positioning hole 234 and a driving shaft 26; the rotating shaft 25 passes through the rotation positioning hole 234 to rotatably mount the movable knife 23 on the back of the needle plate 21;
[0034] The trimming cylinder assembly 29 is rotatably connected to one end of the pull rod 28 via a trimming cylinder joint. The other end of the pull rod 28 is rotatably connected to the drive shaft 26. When the trimming cylinder assembly 29 contracts, it simultaneously drives one end of the pull rod 28 to contract. At this point, the other end of the pull rod 28, via the drive shaft 26, drives the movable knife 23 to rotate about the rotation axis 25 toward the fixed knife 24. During this rotation, the trimming groove 231 of the movable knife 23 forks the bottom and top threads to be cut and continues to move toward the fixed knife 24. When the movable knife 23 and the fixed knife 24 overlap, the trimming groove 231 of the movable knife and the blade of the fixed knife work together to cut the bottom and top threads.
[0035] Similarly, when the trimming cylinder assembly 29 extends, it drives one end of the pull rod 28 to move synchronously. At this time, the other end of the pull rod 28 drives the movable knife 23 to rotate around the rotating axis 25 away from the fixed knife 24 through the push shaft 26 until it returns to its original position.
[0036] The wire cutting groove 231 can be a U-shaped groove, a V-shaped groove or an arc groove.
[0037] The movable knife 23 also includes a cutting end face 232 and a groove 233. The movable knife 23 is provided with a cutting end face 232 at the cutting end of the movable knife 23 facing the fixed knife 24. The cutting end face 232 is provided with a groove 233 extending to the cutting groove 231. The groove 233 divides the cutting end face 232 into two upper and lower areas.
[0038] When the movable knife moves, the bottom thread and the surface thread to be cut will gather in this groove, and the groove leaves space for the embroidery thread, so that the embroidery thread has room to stretch in the groove and will not be tightened, avoiding the embroidery thread from being cut in advance after the movable knife contacts the fixed knife.
[0039] The fixed blade 24 includes a blade 241 at its front end and a positioning U-groove 242 at its rear end.
[0040] A needle plate hole 221 is provided at the center of the small needle plate 22 .
[0041] Furthermore, the intersection of the cutting end surface 232 of the movable knife 23 and the fixed knife blade 241 is located near the needle plate hole 221. Specifically, the distance between the intersection of the fixed and movable knife blades and the needle plate hole is equal to the length of the bottom thread end remaining on the reverse side of the fabric after cutting. Based on this, the distance between the end of the fixed knife closest to the movable knife and the edge of the needle plate hole is adaptively adjusted based on the length of the thread end, so that the fixed knife blade is positioned correspondingly closer to the needle plate hole.
[0042] After comparing existing structural designs, we found that our carefully designed automatic thread trimmer mechanism significantly improves the traditional front mouth, which is too wide to accommodate narrow and deep sewing tasks. This improvement is particularly critical when the product needs to be cleverly inserted and finely sewn.
[0043] To overcome this technical bottleneck, we've fine-tuned the width of the front nozzle to a mere five centimeters in diameter. This reduced design significantly reduces space requirements, achieving ultimate compactness. This revolutionary adjustment enables our automatic thread trimmer to effortlessly handle the vast majority of narrow, semi-finished products requiring precise sewing, such as pen holder bags, finished waders, socks, and finished school uniform labels. This represents a qualitative leap in both precision and efficiency, enabling the successful completion of sewing operations.
[0044] Compared with the existing technology, the driving elements selected by this mechanism are mainly cylinders or motors. In this mechanism, we prefer to use cylinders as the driving source. This choice is made for the purpose of reducing costs and improving
[0045] High efficiency and dual considerations. The pneumatic cylinder drive method ensures high efficiency while avoiding failures, which is particularly important in installation environments with limited space. Pneumatic cylinders can maximize space savings and provide the most efficient solution. Furthermore, pneumatic cylinders offer extremely low maintenance costs, making them a perfect fit for market demand.
[0046] Furthermore, the shuttle hook now features flexible fine-tuning based on the material being sewn. Its design more precisely aligns with the hook groove of the rotary hook, significantly extending its service life. Furthermore, we've added a mounting area for a thread guard on the shuttle hook, an innovative design that makes thread threading even more stable and reliable.
[0047] Furthermore, the blade mounting area in this solution also allows for ample adjustment to meet diverse needs. A thread divider has been cleverly incorporated within the shuttle hook, allowing for precise adjustment to the optimal position through the flexible movement of the small mouth cover. This innovative design ensures perfect coordination between the shuttle and needle during thread hooking, resulting in more precise and efficient sewing results.
[0048] In this solution, the blade installation position has space that can be adjusted according to actual conditions. There is a wire dividing piece inside the shuttle bed positioning hook, and its optimal position can be adjusted by moving the small mouth cover to ensure the best line hooking between the shuttle bed and the needle.
[0049] This embodiment does not require changing the embroidery operation sequence of the existing embroidery machine, and the improved embroidery machine thread trimming device can be directly put into use; although the latter embodiment requires changing the embroidery operation sequence of the embroidery machine, it can greatly improve the reliability of the embroidery machine thread trimming operation and avoid the occurrence of upper thread hooking failure.
[0050] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are provided for illustrative purposes only and are not intended to limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations or modifications may be made to the embodiments of the present invention without departing from the principles described.
Claims
1. An automatic thread trimming mechanism for a modified small head of a computerized pattern machine, characterized in that: The invention comprises a needle plate (21), a small needle plate (22), a needle plate hole (221), a movable knife (23), a fixed knife (24), a rotating shaft (25), a thread trimming cylinder joint (27), a pull rod (28), and a thread trimming cylinder assembly (29); the needle plate (21) directly contacts the object to be processed on the front side of the needle plate (21), and the small needle plate (22) is embedded in a circular countersunk hole at one end of the needle plate (21); One end of the movable knife (23) is provided with a thread cutting groove (231), and the other end is provided with a rotation positioning hole (234) and a driving shaft (26); the rotating shaft (25) passes through the rotation positioning hole (234) to rotate the movable knife (23) and install it on the back of the needle plate (21); The thread trimming cylinder assembly (29) is rotatably connected to one end of the pull rod (28) through the thread trimming cylinder joint, and the other end of the pull rod (28) is rotatably connected to the driving shaft (26); when the thread trimming cylinder assembly (29) contracts, it drives one end of the pull rod (28) to contract synchronously, and at this time, the other end of the pull rod (28) drives the movable knife (23) to rotate around the rotation axis (25) toward the fixed knife (24) through the driving shaft (26); during the rotation process, the thread trimming groove (231) of the movable knife (23) will fork out the bottom thread and the surface thread to be cut and continue to move toward the fixed knife (24) until the movable knife (23) and the fixed knife (24) coincide, and the thread trimming groove (231) of the movable knife and the fixed knife blade work together to cut the bottom thread and the surface thread.
2. The automatic thread trimming mechanism for a modified small head of a computer pattern machine according to claim 1, characterized in that: When the thread trimming cylinder assembly (29) is extended, it drives one end of the pull rod (28) to move synchronously. At this time, the other end of the pull rod (28) drives the movable knife (23) to rotate around the rotation axis (25) in a direction away from the fixed knife (24) through the push shaft (26) until it returns to its original position.
3. The automatic thread trimming mechanism for a modified small head of a computer pattern machine according to claim 1, characterized in that: The wire cutting groove (231) can be a U-shaped groove, a V-shaped groove or an arc groove.
4. The automatic thread trimming mechanism for a modified small head of a computerized pattern machine according to claim 1, characterized in that: The movable knife (23) further comprises a thread cutting end face (232) and a groove (233). The thread cutting end face (232) of the movable knife (23) facing the fixed knife (24) is provided with a thread cutting end face (232). The thread cutting end face (232) is provided with a groove (233) extending to the thread cutting groove (231). The groove (233) divides the thread cutting end face (232) into two upper and lower areas. When the movable knife moves toward the fixed knife, the bottom thread and the top thread to be cut will converge in the groove, and the groove leaves space for the embroidery thread, so that the embroidery thread has space to stretch in the groove and will not be tightened, thereby preventing the embroidery thread from being cut in advance after the movable knife contacts the fixed knife.
5. The automatic thread trimming mechanism for a modified small head of a computerized pattern machine according to claim 1, characterized in that: The fixed knife (24) comprises a blade (241) arranged at its head end and a positioning U-groove (242) at its tail end.
6. The automatic thread trimming mechanism for a modified small head of a computerized pattern machine according to claim 1, characterized in that: A needle plate hole (221) is provided at the center of the small needle plate (22).
7. The automatic thread trimming mechanism for a modified small head of a computerized pattern machine according to claim 5, characterized in that: The distance between the intersection point of the thread cutting end surface (232) of the movable knife (23) and the fixed knife blade (241) and the center of the needle plate hole (221) is 2-3.5 mm.