Thread trimming mechanism of bar tacking machine

Abstract

The utility model relates to sewing equipment, in particular to a thread trimming mechanism of a bartacking machine, which comprises a needle plate, an air suction port allowing a bartacking needle to penetrate through a needle hole up and down and suitable for cloth thread ends to enter is arranged on the needle plate, and an air suction module and a thread trimming module are arranged below the needle plate corresponding to the air suction port. And the exhaust inlet penetrates through the front end of the needle plate to form an open type. Compared with the prior art, due to the design of the open type air suction opening, thread ends of cloth can be sucked in more quickly and accurately, and therefore the thread trimming efficiency is improved.

Description

Technical Field

[0001] The utility model relates to sewing equipment, in particular to a thread cutting mechanism of a bartacking machine. Background Art

[0002] Bartacking machines are essential sewing equipment in the production of textiles such as clothing, shoes, hats, and bags. They are primarily used to create bartacking around the edges of fabric to reinforce the edges and prevent unraveling and fraying. Bartacking machines are also widely used in button sewing operations, securing buttons securely in place by sewing bartacking around them. Using the needle plate and needle in the sewing machine head, the bartacking machine thread is threaded through the fabric, creating a tight bartacking around the edge of the fabric or around a button.

[0003] Although bartacking machines play an important role in the sewing process, the existing bartacking machine thread cutting devices have some defects: the thread cutting devices of most bartacking machines adopt a closed suction port design, which limits the rapid and accurate suction of fabric thread ends, resulting in low operating efficiency.

[0004] In addition, due to the lack of a cloth support plate, the cloth is easily displaced during movement, which not only affects the quality and uniformity of the tacking, but may also cause damage to the cloth. Utility Model Content

[0005] In order to overcome the above technical defects or one of the technical defects in the prior art, the present invention provides an improved thread cutting mechanism for a bartacking machine, which can quickly and accurately suck in the thread ends of the fabric and improve the operating efficiency. To this end, the technical solution adopted by the present invention is:

[0006] A thread trimming mechanism for a bar tacking machine includes a needle plate, on which are provided a needle hole for allowing a bar tacking needle to pass up and down and an air suction port for allowing a thread end of a fabric to enter. A suction module and a thread trimming module are arranged below the needle plate corresponding to the air suction port. Unlike the prior art, the air suction port passes through the front end of the needle plate to form an open shape.

[0007] Furthermore, a fabric support plate is fixed on the upper surface of the needle plate, and an avoidance hole is provided on the fabric support plate so as not to block the feed presser foot from abutting against the needle plate; an opening of the support plate is provided at the position corresponding to the air suction port; both sides of the opening of the support plate and the rear of the corresponding tacking needle extend upward to form positioning baffles.

[0008] Furthermore, a sinking groove is provided on the upper surface of the needle plate and on one side of the air suction port, and a light eye reflective sticker is embedded in the sinking groove.

[0009] Furthermore, the suction module includes a connecting block fixed to the lower surface of the needle plate, and the connecting block is provided with a thread retention groove, a side channel connected to the thread retention groove to avoid the fixed knife and the movable knife of the thread cutting module, and a front channel corresponding to the suction port connected to the thread retention groove; the suction pipe is connected to the thread retention groove of the connecting block, and the suction pipe is connected to the negative pressure air circuit.

[0010] Furthermore, the thread cutting module includes a fixed knife fixed to the lower surface of the needle plate by a fastening pin, and a movable knife connected to the fastening pin and forming a shearing pair with the fixed knife. The eccentric position of the movable knife is hinged to one end of the connecting rod, and the other end of the connecting rod is hinged to the piston rod of the push-pull cylinder.

[0011] Furthermore, it also includes a protective cover, which is fixed on the lower surface of the needle plate and covers the air suction port and the air suction module and thread trimming module close to the front end of the needle plate.

[0012] Furthermore, a proximity switch for detecting the position of the feed presser foot is installed at the tail of the sewing machine.

[0013] Compared with the prior art, the beneficial technical effects of the present invention are mainly reflected in the following aspects:

[0014] Improve thread trimming efficiency: The open suction port design allows fabric thread ends to be sucked in more quickly and accurately, thereby improving thread trimming efficiency.

[0015] Easy to operate: The open design simplifies the placement of fabric threads, making operation easier and faster.

[0016] Improved bartacking quality: Since fabric threads can be sucked in and cut more accurately, the quality and uniformity of bartacking are improved.

[0017] Strong adaptability: The improved thread trimming mechanism can adapt to fabrics of different thicknesses and materials, expanding the application range of the bartacking machine.

[0018] Easy maintenance: The design of the thread trimming module makes maintenance and adjustment more convenient, reducing maintenance time and cost.

[0019] Compact structure: The thread trimming mechanism of the utility model is compactly designed, occupies little space, and is easy to integrate into the existing bartacking machine.

[0020] Improved production efficiency: Due to the increase in cutting speed and the reduction in fabric displacement, the overall production efficiency is improved.

[0021] Reduce labor intensity: The simplified operation process reduces the operator's labor intensity and improves the working environment.

[0022] Improve product aesthetics: Accurate thread cutting and tacking make the final product look neater and more beautiful.

[0023] In short, the thread cutting mechanism of the bar tacking machine of the utility model can significantly improve the working efficiency and product quality of the bar tacking machine, while reducing the operating difficulty and maintenance cost, and has good market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of the present utility model.

[0025] Figure 2 It is a structural schematic diagram of the utility model from another perspective.

[0026] Figure 3 It is a structural schematic diagram of the needle plate of the utility model.

[0027] Figure 4 It is a structural schematic diagram of the cloth supporting plate of the utility model.

[0028] Figure 5 It is a structural schematic diagram of the air suction module and the protective cover of the utility model.

[0029] Figure 6 It is a structural diagram of the thread trimming module of the utility model. DETAILED DESCRIPTION

[0030] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0031] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can readily understand the other advantages and benefits of the present invention from the contents disclosed in this specification. Obviously, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0033] like Figure 1-6 The thread trimming mechanism of a bar tacking machine shown in the figure includes a needle plate 100. The needle plate 100 is provided with a needle hole 101 for allowing the bar tacking needle to pass up and down and an air suction port 102 suitable for the entry of fabric threads. A suction module 200 and a thread trimming module 300 are arranged below the needle plate 100 corresponding to the air suction port 102. The air suction port 102 passes through the front end of the needle plate 100 to form an open shape.

[0034] The process of using a thread trimming mechanism of a bar tacking machine of this embodiment to trim the thread:

[0035] Step 1: Fabric placement - The operator places the fabric flat on the working table of the bar tacking machine, ensuring that the starting position of the fabric is correct.

[0036] Step 2: Fabric positioning - the positioning device of the tacking machine (such as the fabric support plate 400 and the feed presser foot 500 described later) fixes the fabric in the appropriate position.

[0037] Step 3: The bar tack needle passes through the fabric from the needle hole 101 up and down to form a bar tack.

[0038] Step 4: Thread ends are sucked in - the thread ends on the fabric are sucked in by the suction port 102. The open design of the suction port allows the thread ends to be sucked in quickly and accurately.

[0039] Step 5: Thread cutting action - the movable knife in the thread cutting module 300 is driven by the cylinder or other driving mechanism to cut off the sucked thread end.

[0040] Step 6: Fabric stabilization - The suction module 200 provides continuous suction throughout the entire thread trimming process to keep the fabric stable.

[0041] Step 7: Thread trimming is completed - after the thread end is cut off, the thread trimming module 300 is reset and prepared for the next thread trimming action.

[0042] Step 8: Fabric movement - the fabric moves forward according to the feeding system of the tacking machine to prepare for the next tacking position.

[0043] Step 9: Repeat - Repeat steps 3 to 8 until all the tack positions that require trimming are complete.

[0044] Step 10: End of thread trimming - After completing all thread trimming operations, the operator stops the bartacking machine and removes the fabric for inspection.

[0045] Through the above process, the thread trimming mechanism of the bar tacking machine of this embodiment can effectively complete the thread trimming task, thereby improving production efficiency and product quality.

[0046] In another preferred embodiment, a fabric support plate 400 is fixed to the upper surface of the needle plate 100. A clearance hole 401 is defined in the fabric support plate 400 to prevent the feed foot 500 from contacting the needle plate 100. A support opening 402 is defined at the location corresponding to the air intake 102. Positioning baffles 403 extend upward from either side of the support opening 402, corresponding to the rear of the bar tacking needles. The fabric support plate 400 is fixed to the upper surface of the needle plate 100 and primarily serves to support the fabric and ensure its stability during thread trimming. The clearance hole 401 is strategically positioned and sized to prevent the feed foot 500 from contacting the needle plate 100. This design ensures smooth contact between the feed foot 500 and the needle plate 100, thereby ensuring smooth fabric transport. The fabric support plate 400 has a support opening 402 located at the position corresponding to the air intake 102. This opening 402 allows fabric threads to enter the air intake 102 smoothly while maintaining a stable position. Positioning baffles 403 extend upward from both sides of the support opening 402. These baffles 403 serve to further secure the fabric in place, preventing it from shifting during the trimming and bartacking processes. Positioning baffles 403, located behind the bartacking needles, effectively control fabric movement and enhance trimming and bartacking accuracy.

[0047] In another preferred embodiment, a recessed groove 103 is provided on the upper surface of the needle plate 100, on one side of the air intake 102, with a photoeye reflective tape 600 embedded within the recessed groove 103. The provision of the photoeye reflective tape 600 enables the bartacking machine to more accurately detect the position and movement of the fabric. The photoeye detects the fabric using the reflected light from the reflective tape, thereby improving fabric positioning accuracy. With the aid of the photoeye reflective tape 600, the bartacking machine can more accurately determine the timing of thread trimming, ensuring that each trimming occurs at the optimal moment, thereby improving trimming quality. Accurate fabric detection and control of thread trimming timing help reduce fabric waste caused by improper trimming and improve material utilization. The use of the photoeye reflective tape 600 enhances the automation of the bartacking machine, reduces manual intervention, and improves the level of production automation. The photoeye reflective tape 600 embedded within the recessed groove 103 ensures unobstructed fabric movement on the needle plate and is easy to replace and maintain, extending the service life of the equipment. Accurate fabric detection and timely thread cutting reduce production downtime, thereby improving overall production efficiency.

[0048] In another preferred embodiment, the suction module 200 includes a connecting block 201 fixedly connected to the lower surface of the needle plate 100. The connecting block 201 defines a thread retention groove 2011, a side channel 2012 communicating with the thread retention groove 2011 to avoid the fixed blade 301 and movable blade 302 of the thread trimming module 300, and a front channel 2013 corresponding to the suction port 102 and communicating with the thread retention groove 2011. A suction pipe 202 communicates with the thread retention groove 2011 of the connecting block 201 and is connected to the negative pressure air circuit. The connecting block 201 is fixedly connected to the lower surface of the needle plate 100 and serves as the main body of the suction module 200, providing stable support for the entire suction module. The connecting block 201 is provided with a thread retention trough 2011, which is used to collect and temporarily store sucked-in fabric thread ends, preventing them from being prematurely discharged before cutting. A side channel 2012 is connected to the thread retention trough 2011 and is designed to avoid the fixed blade 301 and movable blade 302 of the thread trimming module 300. This channel allows thread ends to flow steadily within the retention trough before cutting, while avoiding interference with the cutting blades. The front channel 2013 corresponds to the air intake 102 and is connected to the thread retention trough 2011. This channel ensures that thread ends can smoothly enter the retention trough 2011 from the air intake 102. The suction pipe 202 is connected to the thread retention trough 2011 of the connecting block 201 and generates suction through a negative pressure air path, sucking the thread ends from the air intake 102 and delivering them through the front channel 2013 into the thread retention trough 2011.

[0049] In another preferred embodiment, the thread trimming module 300 includes a fixed blade 301 secured to the lower surface of the needle plate 100 via a fastening pin 303, and a movable blade 302 connected to the fastening pin 303 to form a shearing pair with the fixed blade 301. The eccentric position of the movable blade 302 is hinged to one end of a connecting rod 304, the other end of which is hinged to the piston rod of a push-pull cylinder 305. The fixed blade 301 is secured to the lower surface of the needle plate 100 via the fastening pin 303 and forms part of the shearing pair. The fixed blade 301 is fixed in position and cooperates with the movable blade 302 in shearing. The movable blade 302 is connected to the fastening pin 303 to form a shearing pair with the fixed blade 301. The movable blade 302 is designed to precisely cooperate with the fixed blade 301 during the shearing process, completing the task of shearing thread ends. The eccentric position of the movable blade 302 is hinged to one end of the connecting rod 304. This eccentric design allows the movable blade 302 to move more stably during the shearing process, improving the accuracy and reliability of the shearing. The other end of the connecting rod 304 is hingedly connected to the piston rod of the push-pull cylinder 305. The push-pull cylinder 305 provides power to the movable blade 302, enabling it to perform the shearing action quickly and accurately.

[0050] Another preferred embodiment further includes a protective cover 700, which is fixed to the lower surface of the needle plate 100 and covers the suction port 102 and the suction module 200 and thread trimming module 300 near the front end of the needle plate 100. The protective cover 700, fixed to the lower surface of the needle plate 100, primarily protects the suction module 200 and thread trimming module 300 of the bartacking machine, preventing damage to these critical components from external factors such as dust and rags. The protective cover 700 is designed to cover the suction port 102, ensuring smooth thread suction while preventing the operator's fingers or other foreign objects from accidentally entering, thereby improving operational safety.

[0051] In another preferred embodiment, a proximity switch for detecting the position of the presser foot is installed at the tail of the sewing machine. This is used to detect the position of the presser foot in real time. This switch is a non-contact sensor that can quickly and accurately detect whether the presser foot is in the correct position. By installing the proximity switch at the tail of the sewing machine, the signal transmission distance can be minimized, thereby improving the response speed of the presser foot position signal to the electronic control system. The real-time signal from the proximity switch can be used by the electronic control system to control other parts of the sewing machine, such as the operation of the thread trimming module 300, ensuring synchronization between the thread trimming operation and the presser foot position.

[0052] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the field can use the above-disclosed methods and technical contents to make many possible changes or modifications to the technical solution of the present invention without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification of the above embodiments made according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A thread trimming mechanism for a bar tacking machine, comprising a needle plate (100), the needle plate (100) being provided with a needle hole (101) for allowing a bar tacking needle to pass through up and down and an air suction port (102) for allowing a thread end of a fabric to enter, a suction module (200) and a thread trimming module (300) being arranged below the needle plate (100) corresponding to the air suction port (102), and characterized in that: The air suction port (102) penetrates the front end of the needle plate (100) to form an open shape.

2. A thread cutting mechanism for a bar tacking machine according to claim 1, characterized in that: A fabric support plate (400) is fixed on the upper surface of the needle plate (100), and an avoidance hole (401) is provided on the fabric support plate (400) so as not to block the cloth feeding presser foot (500) from contacting the needle plate (100); a support plate opening (402) is provided at a position corresponding to the air suction port (102); and positioning baffles (403) are respectively extended upwards on both sides of the support plate opening (402) and behind the corresponding tacking needle.

3. A thread cutting mechanism for a bar tacking machine according to claim 1, characterized in that: A sink groove (103) is provided on the upper surface of the needle plate (100) and on one side of the air suction port (102), and a light eye reflective sticker (600) is embedded in the sink groove (103).

4. A thread trimming mechanism for a bar tacking machine according to claim 1, characterized in that: The suction module (200) comprises a connecting block (201) fixedly connected to the lower surface of the needle plate (100); the connecting block (201) is provided with a thread retention groove (2011), a side channel (2012) communicating with the thread retention groove (2011) to avoid the fixed knife (301) and the movable knife (302) of the thread cutting module (300), and a front channel (2013) corresponding to the suction port (102) communicating with the thread retention groove (2011); a suction pipe (202) is communicated with the thread retention groove (2011) of the connecting block (201), and the suction pipe (202) is connected to a negative pressure air circuit.

5. The thread cutting mechanism of a bar tacking machine according to claim 1, characterized in that: The thread cutting module (300) comprises a fixed knife (301) fixed to the lower surface of the needle plate (100) via a fastening pin (303), a movable knife (302) connected to the fastening pin (303) and forming a shearing pair with the fixed knife (301), wherein the eccentric position of the movable knife (302) is hinged to one end of a connecting rod (304), and the other end of the connecting rod (304) is hinged to the piston rod of a push-pull cylinder (305).

6. A thread trimming mechanism for a bar tacking machine according to claim 1, characterized in that: The device further comprises a protective cover (700), wherein the protective cover (700) is fixed on the lower surface of the needle plate (100), covers the air suction port (102), the air suction module (200) and the thread cutting module (300) near the front end of the needle plate (100).

7. The thread cutting mechanism of a bar tacking machine according to claim 1, characterized in that: A proximity switch for detecting the position of the feed presser foot (500) is installed at the tail of the sewing machine.

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