Feeding structure of a blind seam machine

Abstract

The utility model discloses a kind of feeding structure of blind seam machine, including presser foot plate, the presser foot plate cooperation cloth feeding tooth and blind seam rack, the presser foot plate is fixedly installed at the top of the blind seam rack, two groups of friction plates are equipped in the top of the presser foot plate, and outside avoiding slot is opened in the friction plate, inside avoiding slot is opened between the friction plate, the cloth feeding tooth includes two groups of cloth feeding outer arm arranged in the outside avoiding slot and a group of cloth feeding main arm arranged in the inside avoiding slot, the cloth feeding outer arm and the cloth feeding main arm bottom are connected by connecting block and are connected installation, connecting frame is fixedly installed in the bottom side of the connecting block, and connecting frame is connected and installed with the transmission system in the blind seam rack on.The utility model connecting frame can adaptively adjust its posture and cloth feeding path, change linear cloth feeding into accurate curve cloth feeding, to effectively assist blind seam machine to complete various complex curved surface sewing tasks.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology, specifically relating to a feeding structure for a blind stitch machine. Background Technology

[0002] A blind stitch machine is an industrial sewing device that uses blind stitching technology to achieve seamless stitching on the surface of fabric. It is widely used in areas such as garment cuffs, trouser hems, and sock cuffs. Depending on the model, the sewing speed ranges from 1200 to 2500 stitches per minute, and it features single-thread chain stitch and adjustable seam spacing.

[0003] A domestic utility model patent application with application number CN202320208987.0 discloses a fabric feeding dog, including a main body and a plurality of first sawtooth arms disposed on the main body. The plurality of first sawtooth arms are parallel to each other and there is a gap between adjacent first sawtooth arms. Second sawtooth arms are respectively connected to the first sawtooth arms located on both sides of the main body. At least one third sawtooth arm connected to the first sawtooth arm is disposed between two second sawtooth arms. The second sawtooth arms and the third sawtooth arms are parallel to each other and extend in a direction away from the main body. A plurality of sawtooths for feeding fabric are evenly arranged on the first sawtooth arms, the second sawtooth arms, and the third sawtooth arms. By adding second sawtooth arms and third sawtooth arms to the first sawtooth arms, the biting area with the fabric is effectively increased without interfering with other parts of the sewing machine, thereby improving the biting force on the fabric and realizing stable feeding of thick fabrics. The aforementioned utility model consists of multiple sets of sawtooth arms. When the feed dog is required to feed the fabric in a curved manner, the sawtooth arms have strong limitations and are not convenient to coordinate with the built-in linkage structure to make uniform adjustments to the angle. Workers need to constantly pull and twist the fabric by hand in an attempt to make the curved edge of the fabric adapt to the straight feed of the machine, making it difficult to complete the sewing of complex curved fabrics with high quality and high efficiency. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a feeding structure for a blind stitch machine, including a presser foot plate, feeding teeth that cooperate with the presser foot plate, and a blind stitch machine frame. The presser foot plate is fixedly installed on the top of the blind stitch machine frame. The top of the presser foot plate is provided with two sets of friction plates, and the friction plates are provided with outer clearance grooves and inner clearance grooves between the friction plates. The feeding teeth include two sets of feeding outer arms disposed in the outer clearance grooves and one set of feeding main arms disposed in the inner clearance grooves. The bottom of the feeding outer arms and the feeding main arms are connected and installed through a connecting block. A connecting frame is fixedly installed on one side of the bottom of the connecting block, and the connecting frame is connected and installed to the transmission system inside the blind stitch machine frame.

[0005] As a further preferred technical solution of this utility model, multiple sets of friction blocks are fixedly installed on the friction plate, and there are movement gaps between the inner clearance groove and the main feeding arm, as well as between the outer clearance groove and the outer feeding arm.

[0006] The large gap between the inner clearance groove and the side wall of the main feeding arm provides the necessary space for the component connection frame to move.

[0007] As a further preferred technical solution of this utility model; the height of the outer feeding arm is lower than that of the main feeding arm, the top of the outer feeding arm is provided with multiple sets of outer wall sawtooth portions, the top of the main feeding arm is provided with multiple sets of main arm sawtooth portions, and both the outer wall sawtooth portions and the main arm sawtooth portions are composed of multiple sets of tooth tips and tooth grooves.

[0008] When the connecting frame is driven by a cam or linkage structure at its bottom, the main and outer feed arms also move in a D-shaped trajectory under the transmission of the connecting frame. The friction between the fabric and the serrated edges of the outer wall and main arm drives the fabric to strictly follow the trajectory set by the feed teeth, generating a combined forward and backward and up-and-down motion, thus achieving precise fabric feeding. The groove design on the serrated edges of the outer wall and main arm also serves a chip-collecting function; fiber waste generated during the feeding process is temporarily stored in the grooves. This design ensures that the waste does not interfere with the normal fabric transport, guaranteeing a smooth sewing process. All temporarily stored waste can be cleaned up after the equipment has finished operating, facilitating maintenance.

[0009] As a further preferred technical solution of this utility model, the connecting frame is provided with fixing holes and mounting holes respectively. The fixing holes are fixedly installed to the cam block in the blind seam frame by bolts, and a drive shaft is connected and installed on one side of the cam block.

[0010] The transmission system includes a drive motor, a cam structure, or a linkage structure. The cam block or linkage structure is used to drive the feed teeth. The drive motor provides power to drive the above structure to move, and then transmits the power to the feed teeth of the component. Different structures are connected to the fixing holes and mounting holes respectively, thereby controlling the feed teeth to achieve different angles of movement.

[0011] As a further preferred technical solution of this utility model; the front of the friction plate is connected to the feeding slope, the pressure foot plate between the friction plates is provided with a docking hole, and the side of the docking hole is provided with a corresponding locking hole through the pressure foot plate, and the blind seam frame is provided with a frame cavity at the position of the pressure foot plate.

[0012] The presser foot plate is fixedly installed inside the frame cavity by bolts passing through the mating holes, and the bolts fixed in the mating holes are locked through the locking holes to achieve double fixation of the presser foot plate, thereby ensuring the stability of the presser foot plate during use of the concealed seam frame. Beneficial effects

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The large gap between the inner clearance groove and the side wall of the main feeding arm provides the necessary space for the component connecting frame to move. When the connecting frame docks with the bottom cam structure or linkage structure to feed the fabric in a curved manner, the connecting frame can adaptively adjust its posture and feeding path, transforming straight feeding into precise curved feeding, thereby effectively assisting the blind sewing machine in completing various complex curved sewing tasks. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the installation structure of this utility model; Figure 3 This is a bottom view of the structure of this utility model; Figure 4 This is a cross-sectional structural diagram of the present invention.

[0015] In the diagram: 1. Presser foot plate; 11. Feeding slope; 12. Butt hole; 13. Locking hole; 14. Outer clearance groove; 15. Inner clearance groove; 16. Friction plate; 17. Friction block; 2. Feeding teeth; 21. Feeding outer arm; 22. Feeding main arm; 23. Connecting frame; 231. Fixing hole; 232. Mounting hole; 24. Connecting block; 25. Outer wall serrated part; 26. Main arm serrated part; 3. Blind seam frame; 31. Frame inner cavity; 4. Cam block; 41. Drive shaft. Detailed Implementation

[0016] This specific embodiment is a feeding structure for a blind seam sewing machine.

[0017] The aforementioned utility model consists of multiple sets of sawtooth arms. When the feed dog is required to feed the fabric in a curved manner, the sawtooth arms have strong limitations and are not convenient to coordinate with the built-in linkage structure to make uniform adjustments to the angle. Workers need to constantly pull and twist the fabric by hand in an attempt to make the curved edge of the fabric adapt to the straight feed of the machine, making it difficult to complete the sewing of complex curved fabrics with high quality and high efficiency.

[0018] Example 1: A feeding structure for a blind stitch sewing machine includes a presser foot plate 1, feeding teeth 2 that cooperate with the presser foot plate 1, and a blind stitch sewing machine frame 3. The presser foot plate 1 is fixedly installed on the top of the blind stitch sewing machine frame 3. The top of the presser foot plate 1 is provided with two sets of friction plates 16, and the friction plates 16 have outer clearance grooves 14. The front of the friction plates 16 is connected to a feeding ramp 11. The presser foot plate 1 between the friction plates 16 has a mating hole 12, and the side of the mating hole 12 has a corresponding locking hole 13 that penetrates the presser foot plate 1. The blind stitch sewing machine frame 3 has a frame cavity 31 located at the position of the presser foot plate 1. The presser foot plate 1 is fixedly installed in the frame cavity 31 by bolts passing through the mating hole 12, and the bolts fixed in the mating hole 12 are locked by the locking hole 13, realizing double fixation of the presser foot plate 1, thereby ensuring the stability of the presser foot plate 1 during use of the blind stitch sewing machine frame 3. An inner clearance groove 15 is provided between the friction plates 16. The feed teeth 2 include two sets of feed outer arms 21 set in the outer clearance groove 14 and one set of feed main arms 22 set in the inner clearance groove 15. Multiple sets of friction blocks 17 are fixedly installed on the friction plates 16. There are movement gaps between the inner clearance groove 15 and the feed main arm 22, and between the outer clearance groove 14 and the feed outer arm 21. The length of the inner clearance groove 15 is shorter than that of the outer clearance groove 14, and the width of the inner clearance groove 15 is greater than that of the outer clearance groove 14. The large gap between the inner clearance groove 15 and the side wall of the feed main arm 22 provides necessary movement space for the component connecting frame 23. When the connecting frame 23 docks with the bottom cam structure or linkage structure to feed the fabric in a curved manner, the connecting frame 23 can adaptively adjust its posture and feed path, transforming straight feed into precise curved feed, thereby effectively assisting the blind stitch machine in completing various complex curved surface sewing tasks. The bottom of the outer feeding arm 21 and the main feeding arm 22 are connected and installed by a connecting block 24, and a connecting frame 23 is fixedly installed on one side of the bottom of the connecting block 24.

[0019] The outer feeding arm 21 is lower than the main feeding arm 22. The top of the outer feeding arm 21 has multiple sets of outer wall serrations 25, and the top of the main feeding arm 22 has multiple sets of main arm serrations 26. Both the outer wall serrations 25 and the main arm serrations 26 consist of multiple sets of tooth tips and grooves. When the connecting frame 23 is driven by a cam structure or linkage structure at its bottom, the main feeding arm 22 and the outer feeding arm 21 also move in a D-shaped trajectory under the drive of the connecting frame 23. The friction between the tooth tips on the outer wall serrations 25 and the main arm serrations 26 and the fabric drives the fabric to strictly follow the trajectory set by the feeding teeth 2 of the component, generating a composite motion of forward and backward movement and up and down movement, thereby achieving precise fabric feeding. The groove design on the outer wall serrations 25 and the main arm serrations 26 also has a chip-collecting function. Fiber waste generated during the feeding process is temporarily stored in the grooves. This design ensures that waste does not interfere with the normal transport of the fabric, guaranteeing a smooth sewing process. All temporarily stored waste can be cleaned up after the equipment has finished working, facilitating maintenance. The connecting frame 23 is connected and installed with the transmission system inside the concealed seam machine frame 3.

[0020] The connecting frame 23 has a fixing hole 231 and a mounting hole 232. The fixing hole 231 is fixedly installed to the cam block 4 inside the blind stitch machine frame 3 by bolts, and a drive shaft 41 is connected and installed on one side of the cam block 4. The transmission system includes a drive motor, a cam structure or a linkage structure. The cam block 4 or the linkage structure is used to drive the feed teeth 2. The drive motor provides power to drive the above structure to move, and then transmits the power to the feed teeth 2. Different structures are respectively connected to the fixing hole 231 and the mounting hole 232 to control the feed teeth 2 to achieve different angles of movement. The linkage structure can be an adjustable planar linkage mechanism. It is based on the classic compound linkage mechanism, and adds the ability to adjust the geometric parameters in real time and dynamically, so as to transform the fixed reciprocating motion into a directionally controllable pushing motion, and finally achieve a smooth curved stitch on the fabric.

[0021] All technical features in this embodiment can be freely combined according to actual needs.

[0022] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A feeding structure for a blind stitch sewing machine, characterized in that, The machine includes a presser foot plate (1), a feed tooth (2) that cooperates with the presser foot plate (1), and a blind stitch frame (3). The presser foot plate (1) is fixedly installed on the top of the blind stitch frame (3). The top of the presser foot plate (1) is provided with two sets of friction plates (16), and an outer clearance groove (14) is opened in the friction plate (16). An inner clearance groove (15) is opened between the friction plates (16). The feed tooth (2) includes two sets of feed outer arms (21) set in the outer clearance groove (14) and a set of feed main arms (22) set in the inner clearance groove (15). The bottom of the feed outer arm (21) and the feed main arm (22) are connected and installed through a connecting block (24). A connecting frame (23) is fixedly installed on one side of the bottom of the connecting block (24). The connecting frame (23) is connected and installed to the transmission system in the blind stitch frame (3).

2. The feeding structure of a blind seam sewing machine according to claim 1, characterized in that: Multiple sets of friction blocks (17) are fixedly installed on the friction plate (16). There are movement gaps between the inner clearance groove (15) and the main feeding arm (22), as well as between the outer clearance groove (14) and the outer feeding arm (21).

3. The feeding structure of a blind seam sewing machine according to claim 1, characterized in that: The height of the outer feeding arm (21) is lower than that of the main feeding arm (22). The top of the outer feeding arm (21) is provided with multiple sets of outer wall serrations (25), and the top of the main feeding arm (22) is provided with multiple sets of main arm serrations (26). Both the outer wall serrations (25) and the main arm serrations (26) are composed of multiple sets of tooth tips and tooth grooves.

4. The feeding structure of a blind seam sewing machine according to claim 1, characterized in that: The connecting frame (23) is provided with a fixing hole (231) and an installation hole (232). The fixing hole (231) is fixedly installed to the cam block (4) in the blind seam frame (3) by bolts, and a drive shaft (41) is connected and installed on one side of the cam block (4).

5. The feeding structure of a blind seam sewing machine according to claim 1, characterized in that: The friction plate (16) is connected to the feeding slope (11) on the front. The pressure foot plate (1) between the friction plates (16) is provided with a docking hole (12). The side of the docking hole (12) passes through the pressure foot plate (1) and is provided with a corresponding locking hole (13). The blind seam frame (3) is provided with a frame cavity (31) at the position of the pressure foot plate (1).

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