Buttonhole machine and thread breaking mechanism

Abstract

This application discloses a buttonhole machine and a thread-breaking mechanism. The thread-breaking mechanism comprises: a hot-melt knife mounting base, fixedly connected to the buttonhole machine housing and vertically defining a sliding cavity; a hot-melt knife sliding bracket, mounted within the sliding cavity; a hot-melt blade, located on top of the hot-melt knife sliding bracket; a drive unit, connected to the hot-melt knife sliding bracket and driving it to rise and fall along the sliding cavity; and a positive conductive rod and a negative conductive rod, both connected to the hot-melt blade to electrically heat it. This arrangement allows thread-breaking to suit the needs of buttonholes of varying sizes, eliminating the need to replace the cutting device, significantly reducing production costs. It also reduces the length of thread remaining in the fabric after thread breaking.

Description

Technical Field

[0001] The present application relates to the technical field of sewing equipment design and manufacturing, and in particular to a buttonhole machine and a thread breaking mechanism. Background Art

[0002] Currently, computerized eyelet buttonholing machines use both bobbin thread and core thread to sew buttonholes, which results in numerous limitations when cutting the thread ends. When the length of a buttonhole changes and exceeds the range of the thread trimmer, the entire set of thread trimmers must be replaced. For example, if the buttonhole length is 25mm, we can choose the corresponding L1826 thread trimmer. However, when the length is changed to 27mm, this set of scissors will no longer be able to cut the thread properly, requiring the use of a different model, the L2230 cutter unit. Each set of cutters can generally cut within a set range of 8mm. This solution is expensive to use and, due to the buttonhole length limitation, has not been able to meet market demand. There is also the issue of long residual thread ends. Summary of the Invention

[0003] The present application aims to provide a buttonhole machine that can cut the thread to meet the needs of sewing buttonholes of different sizes without replacing the cutting device, significantly reducing production costs; and also reducing the length of thread remaining in the fabric after thread cutting. Another object of the present application is to provide a thread cutting mechanism for use in the above-mentioned buttonhole machine.

[0004] To achieve the above objectives, the present application provides a disconnection mechanism, comprising:

[0005] The hot melt knife mounting seat is fixedly connected to the housing of the buttonhole machine and has a vertical sliding cavity;

[0006] The hot melt knife sliding bracket is installed in the sliding cavity;

[0007] A hot melt blade is provided on the top of the hot melt knife sliding bracket;

[0008] A driving part, connected to the hot melt knife sliding bracket and driving the hot melt knife sliding bracket to move up and down along the sliding cavity;

[0009] The positive conductive rod and the negative conductive rod are connected to the hot melt blade to heat the hot melt blade through electricity.

[0010] In some embodiments, a driving block is connected between the hot melt knife sliding bracket and the driving part, and the driving block is screwed to the top end of the driving part through a thread.

[0011] In some embodiments, the device further comprises a fixed positive electrode terminal and a negative electrode terminal, wherein the positive electrode terminal is disposed below the positive electrode conductive rod and the negative electrode terminal is disposed below the negative electrode conductive rod;

[0012] When the driving unit drives the hot melt blade to rise, the positive terminal is disconnected from the positive conductive rod, and the negative terminal is disconnected from the negative conductive rod;

[0013] When the driving unit drives the hot melt blade to descend to the set position, the positive terminal is connected to the positive conductive rod, the negative terminal is connected to the negative conductive rod, and the hot melt blade is energized and conductive.

[0014] The present application also provides a buttonhole machine, comprising the thread breaking mechanism as described above.

[0015] In some embodiments, further comprising:

[0016] A feeding tray is slidably mounted on the housing of the buttonhole machine and is used to carry fabrics. The feeding tray has a cutting hole.

[0017] The thread suction mechanism is used to suck the free thread ends after the buttonhole of the fabric is pulled for thread cutting;

[0018] The thread breaking mechanism is arranged below the feeding tray and is used for lifting and lowering and passing through the cutting hole to cut off the free thread ends that are sucked and pulled relative to the fabric.

[0019] In some embodiments, the disconnect mechanism is a thermal fuse mechanism that is electrically heated.

[0020] In some embodiments, the thread suction mechanism is an air suction nozzle.

[0021] In some embodiments, the cutting hole is in the shape of a strip located in the center of the feeding tray.

[0022] When sewing buttonholes of different sizes, the buttonhole machine provided by the present application only needs to slide and adjust the feed tray to adjust the position of the free thread end after the buttonhole of the supplementary fabric is sewn, and ensure that the relative position with the thread cutting mechanism is appropriate; the free thread end is sucked in by the thread suction mechanism, and the free thread end is cut off relative to the fabric by the thread cutting mechanism when it rises, which eliminates the need to replace the cutting module according to the buttonhole size, and can reduce the length of the residual thread end and reduce the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0024] Figure 1 A structural diagram of a buttonhole machine provided in an embodiment of the present application;

[0025] Figure 2 A top view of a buttonholer provided in an embodiment of the present application;

[0026] Figure 3 for Figure 1 Schematic diagram of the interrupter mechanism in the retracted state;

[0027] Figure 4 for Figure 1 Schematic diagram of the thread-breaking mechanism in the extended tangent state.

[0028] in:

[0029] 1-hot melt blade, 2a-positive conductive rod, 2b-negative conductive rod, 3-hot melt knife sliding bracket, 4-drive block, 5-drive cylinder, 6-hot melt knife mounting seat, 7a-positive terminal, 7b-negative terminal, 8-fabric, 8a-thread trimmer position, 9a-free thread end, 9b-connected thread end, 10-suction nozzle, 11-needle plate, 12-bending needle rotating seat, 13-housing, 14-cutter seat, 15-presser foot, 16-pressing plate, 17-feeding tray. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0031] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0032] The present application provides a thread breaking mechanism that can be applied to a buttonhole machine. Figure 1 To the attached Figure 4 The wire breaking mechanism includes a hot melt blade 1, a hot melt knife mounting seat 6, a hot melt knife sliding bracket 3, a driving unit, a positive conductive rod 2a, a negative conductive rod 2b, a positive terminal 7a, a negative terminal 7b and a driving block 4.

[0033] This article first introduces a buttonholing machine that utilizes a feed tray 17 to support fabric 8. By adjusting the position of the feed tray 17 and coordinating it with a thread-breaking mechanism, the position of the free thread ends 9a after sewing buttonholes of different sizes is adjusted to match the thread-breaking mechanism. The free thread ends 9a are then sucked in by a thread-sucking mechanism and then cut by the thread-breaking mechanism. This eliminates the need to replace cutting modules of different specifications, thereby reducing equipment and production costs. It should be noted that the improvements of this application primarily lie in the arrangement of the thread-breaking mechanism, the thread-sucking mechanism, and the connection between the feed tray 17 and the machine housing 13. Other components of the buttonholing machine, such as the needle holder, the looper rotating seat 12, the presser foot 15 and the presser plate 16, the drive unit, and the electronic control system, can be configured with reference to the prior art.

[0034] Please continue reading Figure 1 and Figure 2 In a specific embodiment provided in the present application, a feed tray 17 is horizontally slidably connected to the upper surface of the buttonhole machine casing 13, and the fabric 8 is carried on the feed tray 17 and pressed by the pressure plate 16. By sliding the feed tray 17 relative to the casing 13, the position of the fabric 8 relative to the thread cutting mechanism can be adjusted to compensate for the size difference of the buttonhole. When the buttonhole length "A" changes, the feed tray 17 will adjust the position of the fabric 8 in the Y+ and Y- directions, and always place the thread tail at the thread cutting head position 8a. In this way, no matter how the buttonhole length changes, the thread cutting mechanism can obtain the set thread tail length at the specified position, thereby achieving the purpose of shortening the buttonhole thread head, without the need for adding a new manual trimming process, and maximizing the buttonhole sewing length and obtaining an extremely short thread tail length.

[0035] A cutting hole is provided in the center of the feeding tray 17. The cutting hole is specifically an oblong hole / strip hole. The thread-breaking mechanism is provided in the casing 13 and is located below the feeding tray 17. The thread-breaking mechanism can be lifted up and down through the cutting hole to reach the thread cutting head position 8a to cut the thread. The thread-sucking mechanism is provided on the side away from the pressing plate 16. The thread-sucking mechanism specifically adopts a suction nozzle 10. The needle plate 11 and the curved needle rotating seat 12 convey the bottom line to the fabric 8 to form a connected thread end 9b. The free thread end 9a after the buttonhole is sewn is sucked by the suction nozzle 10. After sewing is completed, the free thread end 9a can be cut off from the fabric 8 by using the thread-breaking mechanism, and the suction nozzle 10 will recycle the broken thread. This application does not limit the sliding connection method between the feeding tray 17 and the casing 13.

[0036] See Figure 3 and Figure 4 In one embodiment, the disconnect mechanism utilizes a thermal fuse mechanism that generates heat upon application of electricity. The thermal fuse mechanism includes a hot melt blade 1, a hot melt blade mounting base 6, a hot melt blade sliding bracket 3, a drive unit, a positive conductive rod 2a, and a negative conductive rod 2b. The drive unit utilizes a drive cylinder 5 mounted on the cutter base 14. The hot melt blade mounting base 6 is fixed to the housing 13 and defines a vertical sliding cavity. The hot melt blade sliding bracket 3 is disposed within the sliding cavity and is slidably connected to the hot melt blade mounting base 6. Driven by the drive cylinder 5, the hot melt blade sliding bracket 3 can rise and fall relative to the hot melt blade mounting base 6. The hot melt blade 1 is fixed to the top of the hot melt blade sliding bracket 3. The positive conductive rod 2a and the negative conductive rod 2b are fixed to the hot melt blade sliding bracket 3 and are respectively arranged on either side of the hot melt blade 1. The positive conductive rod 2a and the negative conductive rod both abut the hot melt blade 1 and are electrically connected through the hot melt blade 1, simultaneously heating the hot melt blade 1. The hot melt blade 1 moves upward to the thread cutting head position 8a, and the attracted and pulled free state thread 9a is melted and removed from the fabric 8. The suction nozzle 10 simultaneously absorbs and recovers the free state that has been melted and removed, eliminating the tedious work of regular cleaning.

[0037] In a further embodiment, a drive block 4 is further disposed between the drive cylinder 5 and the hot melt blade sliding bracket 3. The bottom end of the drive block 4 is threadedly connected to the top end of the drive cylinder 5, and one side of the drive block 4 is fixedly connected to the hot melt blade sliding bracket 3. This structure allows the top end position of the hot melt blade 1 to be adjusted by adjusting the connection between the drive block 4 and the drive cylinder 5. This structure also allows for fine-tuning the working position of the hot melt blade 1, ensuring that it remains below the plane of the fabric 8, preventing it from touching and damaging the fabric and affecting its aesthetics.

[0038] In addition, the thermal fuse mechanism also includes a positive terminal 7a and a negative terminal 7b. The positive terminal 7a is fixed to the housing 13 and is located below the positive conductive rod 2a. The negative terminal 7b is fixed to the housing 13 and is located below the negative conductive rod 2b. Figure 3 In the state shown, the positive terminal 7a and the positive conductive rod 2a are in contact and electrically conductive, and the negative terminal 7b and the negative conductive rod 2b are in contact and electrically conductive, at which time the hot melt blade 1 is heated; when the driving cylinder 5 is extended, that is, in the Figure 4 In the illustrated state, the positive terminal 7a is separated from the positive conductive rod 2a, the negative terminal 7b is separated from the negative conductive rod 2b, and the hot melt blade 1 is powered off and stops heating. At this point, the relatively hot hot melt blade 1 passes through the cutting hole of the feed tray 17, where it is attracted and pulled by the suction nozzle 10, and is melted and cut off. This arrangement allows the hot melt blade 1 sufficient heating and cooling time while preventing it from being constantly powered on, which could cause the hot melt blade 1 to overheat and pose a safety hazard.

[0039] In the above embodiment, the wire cutting mechanism can employ either the aforementioned wire cutting mechanism or a conventional blade for wire cutting. The drive unit and hot melt blade mounting seat 6 can be fixedly mounted within the housing 13, or the drive unit and hot melt blade mounting seat 6 can be integrally fixed to a sliding support, which is then slidably mounted within the housing 13 along the length of the cutting hole. Adjustment of the cutting head position 8a of the hot melt blade 1 can be achieved by adjusting and securing the sliding support relative to the housing 13. The sliding connection between the sliding support and the housing 13 can employ conventional fitting methods such as slide rails and slide grooves, and is not specifically limited herein. The drive unit can employ a drive cylinder 5, an electric push rod, a ball screw mechanism, or the like.

[0040] The advantages of the buttonhole machine provided by this application are as follows:

[0041] Use thermal melting technology to cut the wire tail to the shortest position, eliminating the need for manual trimming;

[0042] No additional thread trimming device is required from the shortest buttonhole to the longest buttonhole, which has wide adaptability;

[0043] The tail length can be adjusted by electronic control to its fusing position, which can not only achieve extremely short wire residue, but also increase the reserved length, dynamically and safely control the tail length, so as to achieve the purpose of multi-purpose of one machine;

[0044] The seams will automatically bond after being hot-melted, which helps reduce the risk of unraveling.

[0045] The thread ends that fall off after melting will be directly sucked away by the thread suction mechanism, eliminating the need to clean the thread ends regularly.

[0046] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0047] The above describes in detail the buttonholing machine and thread-breaking mechanism provided by the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only intended to help understand the method and core concept of the present application. It should be noted that, for those skilled in the art, various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A wire breaking mechanism, characterized in that: include: The hot melt knife mounting seat is fixedly connected to the housing of the buttonhole machine and has a vertical sliding cavity; A hot melt knife sliding bracket is installed in the sliding cavity; A hot melt blade is provided on the top of the hot melt blade sliding bracket; A driving unit connected to the hot melt knife sliding bracket and driving the hot melt knife sliding bracket to move up and down along the sliding cavity; A positive conductive rod and a negative conductive rod, which are connected to the hot melt blade to heat the hot melt blade through electricity; It also includes a fixed positive electrode terminal and a negative electrode terminal, wherein the positive electrode terminal is arranged below the positive electrode conductive rod, and the negative electrode terminal is arranged below the negative electrode conductive rod; When the driving unit drives the hot melt blade to rise, the positive electrode terminal is disconnected from the positive electrode conductive rod, and the negative electrode terminal is disconnected from the negative electrode conductive rod; When the driving unit drives the hot melt blade to descend to a set position, the positive electrode terminal is connected to the positive electrode conductive rod, the negative electrode terminal is connected to the negative electrode conductive rod, and the hot melt blade is energized and conductive.

2. The wire breaking mechanism according to claim 1, characterized in that: A driving block is connected between the hot melt knife sliding bracket and the driving part, and the driving block is screwed to the top end of the driving part through threads.

3. A buttonholing machine, characterized in that: It comprises the wire breaking mechanism as described in any one of claims 1-2 above.

4. The buttonholer according to claim 3, wherein: Also includes: A feeding tray is slidably mounted on the housing of the buttonhole machine and is used to carry fabrics, and a cutting hole is provided on the feeding tray; The thread suction mechanism is used to suck the free thread ends after the buttonhole of the fabric is pulled for thread cutting; The thread breaking mechanism is arranged below the feeding tray and is used for lifting and lowering and passing through the cutting hole to cut off the free thread end that is sucked and pulled relative to the fabric.

5. The buttonholer according to claim 4, characterized in that The disconnection mechanism is a thermally fused disconnection mechanism that is electrically heated.

6. The buttonholer according to claim 4, wherein: The thread suction mechanism is an air suction nozzle.

7. The buttonholer according to claim 4, wherein: The cutting hole is a strip-shaped hole arranged in the center of the feeding tray.

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