Automatic curved surface product sewing machine

Abstract

The utility model discloses a kind of automatic sewing machines of curved surface product, its rack is fixed with sewing head, product backing pad assembly is assembled with the lower side of sewing head on rack, product backing pad assembly includes fixed cylinder and movable cylinder, movable cylinder can be assembled together with fixed cylinder by axially moving and being able to rotate around axis circumferentially, material frame is provided with product backing pad assembly, and material frame is provided with feeding mechanism between product backing pad assembly;Fixed cylinder is provided with pre-fixing station, pre-fixing station is provided with pre-fixing clamping mechanism that can move along the axis of fixed cylinder, pre-fixing clamping mechanism is provided with centering mechanism, and sewing station is provided with movable cylinder position, sewing clamping mechanism is provided on movable cylinder, after curved surface product is clamped and fixed by pre-fixing clamping mechanism, it is axially transported from pre-fixing station to sewing station.The advantage is that: structure is reasonable, the automatic sewing of curved surface product can be realized, production efficiency and product consistency are improved, and worker's work intensity is reduced.

Description

Technical Field

[0001] This utility model relates to the field of curved surface product sewing technology, specifically an automatic sewing machine for curved surface products. Background Technology

[0002] Curved products (such as hood flaps) are frequently encountered sewing components in the sewing process. Because the sewing platform is flat, curved products need to be flattened before sewing. To ensure sewing quality, the curved product must remain flat during the sewing process. For some softer curved products, such as those made of hard, curved leather, flattening is relatively easy. However, for curved products like hood flaps, which have a certain degree of hardness and resilience, flattening is more difficult. This forces workers to constantly apply pressure to keep the curved product flat during sewing, increasing labor intensity and affecting sewing quality, resulting in poor product consistency and low production efficiency. Furthermore, the process requires operators to maintain a sitting or standing posture, leading to high labor intensity. Therefore, an automatic sewing machine capable of sewing curved products needs to be designed. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned deficiencies and to disclose to the public an automatic sewing machine for curved products with a reasonable structure, which can realize the automated sewing of curved products, improve production efficiency and product consistency, and reduce the labor intensity of workers.

[0004] The technical solution of this utility model is implemented as follows:

[0005] An automatic sewing machine for curved products includes a frame, a sewing machine head fixed on the frame, a product liner assembly mounted below the sewing machine head on the frame, the product liner assembly including a fixed cylinder fixed to the frame, a movable cylinder outer sleeve of the fixed cylinder, the movable cylinder being axially movable and circumferentially rotatable and assembled with the fixed cylinder, a material frame disposed next to the product liner assembly, and a feeding mechanism disposed between the material frame and the product liner assembly; a pre-fixing station is disposed on the fixed cylinder, the pre-fixing station being disposed with a pre-fixing clamping mechanism axially movable along the fixed cylinder, the pre-fixing clamping mechanism being disposed with a centering mechanism, a sewing station is disposed at the position of the movable cylinder, the movable cylinder being disposed with a sewing clamping mechanism, the pre-fixing clamping mechanism clamping and fixing the curved product and then axially conveying it from the pre-fixing station to the sewing station.

[0006] Further optimization measures for this technical solution are as follows:

[0007] As an improvement, the specific structure for the movable cylinder to move axially is as follows: a first driving device is fixed on the frame, the first driving device is connected to a transmission shaft, a transmission belt is mounted on the transmission shaft, a movable frame is fixed on the transmission belt, and the movable cylinder is disposed on the movable frame.

[0008] As an improvement, the specific structure of the movable cylinder that can rotate circumferentially around the axis is as follows: a second driving device is provided on the frame, an assembly base is provided on the frame, a spline shaft is provided on the assembly base, the second driving device is connected to the spline shaft for transmission, a first synchronous pulley is provided on the spline shaft, a second synchronous pulley is connected to the movable cylinder, and the first synchronous pulley and the second synchronous pulley are connected for transmission through a synchronous belt.

[0009] As an improvement, the pre-fixed clamping mechanism includes an axial movement drive device, on which a mounting bracket is connected. A push plate is provided at the inner end of the mounting bracket, and pre-fixed grippers are respectively provided on both sides of the mounting bracket. A downward pressure drive device is also provided on the mounting bracket, and a downward pressure plate is connected to the downward pressure drive device. After the curved surface product to be sewn is clamped and fixed by the pre-fixed grippers, the axial movement drive device drives the mounting bracket to move, pushing the curved surface product to be sewn from the pre-fixed station to the sewing station.

[0010] As an improvement, the pre-fixed gripper includes a first gripper driving device, a first driving connector, and a first chuck assembly. The middle part of the first driving connector is hinged to the mounting bracket, one end of the first driving connector is hinged to the first extension rod of the first gripper driving device, and the first chuck assembly is fixed to the other end of the first driving connector.

[0011] As an improvement, the axial movement drive device is disposed within the fixed cylinder, which has an axial guide groove. The axial movement drive device is connected to the mounting bracket via a first connecting rod, which extends from the axial guide groove. The axial guide groove allows for smoother and more stable pushing of the curved surface product to be sewn. Disposing the axial movement drive device within the fixed cylinder results in a more compact structure and smaller footprint.

[0012] As an improvement, the centering mechanism includes a centering drive device, a second connecting rod, and a push block. A moving block is connected to the centering drive device, and the push block is hinged to the fixed cylinder. The second connecting rod is symmetrically arranged on both sides of the centering drive device, with one end hinged to the moving block and the other end hinged to the corresponding push block. This centering mechanism centers the curved surface product to be sewn at the pre-fixed station, preventing positional deviations that could affect subsequent product quality when the feeding mechanism transfers the product from the material frame to the pre-fixed station.

[0013] As an improvement, circumferential guide grooves are symmetrically formed on both sides of the fixed cylinder, and a guide rod is provided on the push block, with the guide rod extending into the corresponding circumferential guide groove. The circumferential guide grooves serve a guiding function, allowing the push block to move better along the designed trajectory.

[0014] As an improvement, the stitching clamping mechanism includes a second gripper drive device, a second drive connector, and a second clamping head assembly. The middle part of the second drive connector is hinged to the movable cylinder, one end of the second drive connector is hinged to the second extension rod of the second gripper drive device, and the second clamping head assembly is fixed to the other end of the second drive connector.

[0015] As an improvement, the movable cylinder is provided with a positioning boss. Using the positioning boss to position the curved surface product to be sewn at the sewing station can improve the accuracy of pushing, and enhance product quality and consistency.

[0016] The advantages of this utility model compared with the prior art are:

[0017] This utility model discloses an automatic sewing machine for curved products. It features a rational structure, where a feeding mechanism transports curved products from a material frame to a product liner assembly. The product liner assembly includes a pre-fixing station and a sewing station. The pre-fixing station is equipped with a pre-fixing clamping mechanism with a centering mechanism. This mechanism pre-fixes the curved product to be sewn, transported from the material frame by the feeding mechanism, and centers it. Finally, the pre-fixing clamping mechanism clamps and secures the curved product at the pre-fixing station before axially transporting it to the sewing station. The product liner assembly, composed of a fixed cylinder and a movable cylinder, matches the curved surface of the product. The sewing clamping mechanism on the movable cylinder fixes the product. The axial movement and rotation of the movable cylinder ensures the sewing position is directly below the sewing machine head, which then completes the sewing. This automated sewing process for curved products significantly improves production efficiency and product quality while reducing worker workload. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0019] Figure 2 yes Figure 1 Enlarged view of section A in the middle;

[0020] Figure 3 This is a perspective view of another embodiment of the present utility model;

[0021] Figure 4 yes Figure 3 Enlarged view of section B;

[0022] Figure 5 yes Figure 3 Enlarged view of section C;

[0023] Figure 6 This is a three-dimensional structural diagram of the present invention after the outer cover has been removed;

[0024] Figure 7 yes Figure 6 Enlarged view of section D in the middle;

[0025] Figure 8 This is a schematic diagram of the transmission structure for the circumferential rotation of the movable cylinder of this utility model.

[0026] The names of the reference numerals in the accompanying drawings of this utility model are:

[0027] Frame 1, sewing machine head 11, fixed cylinder 21, axial guide groove 21a, circumferential guide groove 21b, movable cylinder 22, positioning boss 22a, material frame 3, feeding mechanism 31, first drive device 41, transmission shaft 42, transmission belt 43, moving frame 44, second drive device 51, mounting base 52, spline shaft 53, transmission gear 53a, first synchronous pulley 54, second synchronous pulley 55, synchronous belt 56, axial movement drive device 61, mounting bracket 62, push plate 63, pressing drive device 64, pressing plate 65, first connecting rod 66, first gripper drive device 71, first extension rod 71a, first drive connector 72, first chuck assembly 73, centering drive device 81, moving block 81a, second connecting rod 82, push block 83, guide rod 83a, second gripper drive device 91, second extension rod 91a, second drive connector 92, second chuck assembly 93. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings:

[0029] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the present invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0030] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0031] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0032] like Figures 1 to 7 As shown, an automatic sewing machine for curved products includes a frame 1, on which a sewing machine head 11 is fixed. A product liner assembly is mounted on the frame 1 below the sewing machine head 11. The product liner assembly includes a fixed cylinder 21 fixed to the frame 1. A movable cylinder 22 is fitted over the fixed cylinder 21. The movable cylinder 22 is axially movable and circumferentially rotatable and is assembled with the fixed cylinder 21. A material frame 3 is provided next to the product liner assembly. A feeding mechanism 31 is provided between the material frame 3 and the product liner assembly. A pre-fixing station is provided on the fixed cylinder 21. A pre-fixing clamping mechanism that can move axially along the fixed cylinder 21 is provided on the pre-fixing station. The pre-fixing clamping mechanism is provided with a centering mechanism. A sewing station is provided at the position of the movable cylinder 22. A sewing clamping mechanism is provided on the movable cylinder 22. The pre-fixing clamping mechanism clamps and fixes the curved product and then axially transports it from the pre-fixing station to the sewing station.

[0033] In this embodiment, the feeding mechanism 31 uses an adsorption head connected to a negative pressure device to transfer curved products by adsorption under negative pressure; alternatively, a mechanical claw can be used to transfer the products.

[0034] The specific structure for the axially movable cylinder 22 is as follows: a first driving device 41 is fixed on the frame 1, the first driving device 41 is connected to a transmission shaft 42, a transmission belt 43 is mounted on the transmission shaft 42, a movable frame 44 is fixed on the transmission belt 43, and the movable cylinder 22 is disposed on the movable frame 44. As an improvement, transmission belts 43 are respectively mounted on both ends of the transmission shaft 42.

[0035] The working principle of the axial movement of the movable cylinder 22: The first drive device 41 is preferably a motor, and the first drive device 41 and the transmission shaft 42 are transmitted through gears. By rotating the first drive device 41 in both directions, the transmission shaft 42 is driven to rotate, and then the transmission belt 43 wrapped around both ends of the transmission shaft 42 moves, thereby driving the axial movement of the movable frame 44, thus realizing the axial movement (forward or backward) of the movable cylinder 22.

[0036] The specific structure of the movable cylinder 2, which can rotate circumferentially around the axis, is as follows: a second drive device 51 is provided on the frame 1, an assembly base 52 is provided on the frame 1, a spline shaft 53 is provided on the assembly base 52, the second drive device 51 is connected to the spline shaft 53 for transmission, a first synchronous pulley 54 is provided on the spline shaft 53, a second synchronous pulley 55 is connected to the movable cylinder 22, and the first synchronous pulley 54 and the second synchronous pulley 55 are connected for transmission through a synchronous belt 56.

[0037] The splined shaft 53 is provided with a transmission gear 53a, and the second drive device 51 is connected to the transmission gear 53a for transmission.

[0038] The working principle of the rotation of the movable cylinder 22: The second drive device 51 is preferably a motor. The second drive device 51 is connected to the transmission gear 53a on the splined shaft 53. The use of the splined shaft 53 here allows the movable cylinder 22 to rotate without affecting its axial movement. Specifically, the rotation of the second drive device 51 drives the rotation of the splined shaft 53, which in turn drives the rotation of the first synchronous pulley 54. The synchronous belt 56 then drives the second synchronous pulley 55, thereby realizing the rotation of the movable cylinder 4.

[0039] The pre-fixed clamping mechanism includes an axial movement drive device 61, on which a mounting bracket 62 is connected. A push plate 63 is provided at the inner end of the mounting bracket 62, and pre-fixed grippers are provided on both sides of the mounting bracket 62. A downward pressure drive device 64 is also provided on the mounting bracket 62, and a downward pressure plate 65 is connected to the downward pressure drive device 64. The downward pressure drive device 64 is preferably a cylinder.

[0040] The pre-fixed gripper includes a first gripper drive device 71, a first drive connector 72, and a first chuck assembly 73. The middle part of the first drive connector 72 is hinged to the mounting bracket 62, one end of the first drive connector 72 is hinged to the first extension rod 71a of the first gripper drive device 71, and the first chuck assembly 73 is fixed to the other end of the first drive connector 72.

[0041] The axial movement drive device 61 is disposed inside the fixed cylinder 21. The fixed cylinder 21 is provided with an axial guide groove 21a. The axial movement drive device 61 is connected to the mounting bracket 62 through a first connecting rod 66, which extends out from the axial guide groove 21a.

[0042] The axial movement drive device 61 is placed inside the fixed cylinder 21, which makes the structure more compact and reduces the space occupied. The axial guide groove 21a makes the axial movement of the mounting bracket 62 smoother and more stable, thereby ensuring the accuracy of product delivery.

[0043] The centering mechanism includes a centering drive device 81, a second connecting rod 82, and a push block 83. A moving block 81a is connected to the centering drive device 81. The push block 83 is hinged to the fixed cylinder 21. The second connecting rod 82 is symmetrically arranged on both sides of the centering drive device 81. One end of the second connecting rod 82 is hinged to the moving block 81a, and the other end is hinged to the corresponding push block 83.

[0044] The fixed cylinder 21 has symmetrical circumferential guide grooves 21b on both sides, and the push block 83 is provided with a guide rod 83a, which extends into the corresponding circumferential guide groove 21b.

[0045] The centering drive device 81 is preferably a cylinder. In this embodiment, a single cylinder synchronously drives the push blocks 83 on both sides to move, thereby achieving the centering operation of the product. Working principle: When the centering drive device 81 is activated, it causes the moving block 81a to descend. The moving block 81a moves, and through the transmission of the second connecting rod 82, it drives the push block 83 to rotate around the hinge axis with the fixed cylinder 21, thereby causing the upper end of the push block 83 to move towards the center, thus achieving the centering operation of the product. The cooperation between the circumferential guide groove 21b and the guide rod 83a allows the push block 83 to run along the designed trajectory, improving the stability of the equipment operation.

[0046] The stitching clamping mechanism includes a second gripper drive device 91, a second drive connector 92, and a second clamping head assembly 93. The middle part of the second drive connector 92 is hinged to the movable cylinder 22, one end of the second drive connector 92 is hinged to the second extension rod 91a of the second gripper drive device 91, and the second clamping head assembly 93 is fixed to the other end of the second drive connector 92.

[0047] The second gripper drive device 91 is preferably a cylinder. When the second gripper drive device 91 is activated, it drives the second drive connector 92 to rotate around the hinge axis in the middle, thereby pressing down or lifting the second chuck assembly 93, thus achieving the clamping and fixing or releasing of the product.

[0048] The movable cylinder 22 is provided with a positioning boss 22a.

[0049] The automatic sewing machine for curved products uses a product liner assembly consisting of a fixed cylinder 21 and a movable cylinder 22 to match the curved surface of the product, so that the curved product does not need to be flattened during the sewing process, which can greatly improve sewing efficiency and sewing quality.

[0050] The working principle of this automatic sewing machine for curved surface products:

[0051] The curved product to be sewn (such as a cap flap) is placed in the material frame 3. The feeding mechanism 31 transfers the curved product to be sewn from the material frame 3 to the pre-fixed station. The pressing drive device 64 drives the pressing plate 65 to move down, limiting and pre-fixing the product (at this time, the fixing force is small, and the product is still adjusting its circumferential position). The centering mechanism works, and the centering drive device 81 drives the push block 83 to move and center the product. Then, the pre-fixing gripper works, and the first gripper drive device 71 drives the first clamp assembly 73 to clamp and fix the product. Next, the axial movement drive device 61 starts, driving the mounting bracket 62 and the clamped and fixed product to move axially to the sewing station until the product abuts against the positioning boss 22a. At the sewing station, the sewing clamping mechanism works, and the second gripper drive device 91 drives the second clamp assembly 93 to clamp and fix the product. The movable cylinder 22 moves along the sewing line by combining rotation and axial movement, so that the sewing position is directly below the sewing machine head 11, to complete the sewing of the designed line. After sewing is completed, the sewing clamping mechanism releases the product, and the movable cylinder 22 rotates, causing the sewn product to fall under gravity (a finished product frame can be placed below to receive the sewn product). The movable cylinder 22 then resets, waiting for the next product. This completes the sewing of one curved product. By repeating this cycle, automated production of curved product sewing can be achieved.

[0052] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic sewing machine for curved products, comprising a frame (1) on which a sewing machine head (11) is fixed, characterized in that: The frame (1) is equipped with a product liner assembly below the sewing machine head (11). The product liner assembly includes a fixed cylinder (21) fixed to the frame (1). The fixed cylinder (21) is fitted with a movable cylinder (22). The movable cylinder (22) is axially movable and circumferentially rotatable around its axis and is assembled with the fixed cylinder (21). A material frame (3) is provided next to the product liner assembly. A feeding mechanism (31) is provided between the material frame (3) and the product liner assembly. A pre-fixing station is provided on the fixed cylinder (21). A pre-fixing clamping mechanism that can move axially along the fixed cylinder (21) is provided on the pre-fixing station. The pre-fixing clamping mechanism is provided with a centering mechanism. A sewing station is provided at the position of the movable cylinder (22). A sewing clamping mechanism is provided on the movable cylinder (22). The pre-fixing clamping mechanism clamps and fixes the curved product and then axially transports it from the pre-fixing station to the sewing station.

2. The automatic sewing machine for curved surface products according to claim 1, characterized in that: The specific structure of the movable cylinder (22) that can move axially is as follows: a first driving device (41) is fixed on the frame (1), the first driving device (41) is connected to a transmission shaft (42), a transmission belt (43) is mounted on the transmission shaft (42), a movable frame (44) is fixed on the transmission belt (43), and the movable cylinder (22) is set on the movable frame (44).

3. The automatic sewing machine for curved surface products according to claim 2, characterized in that: The specific structure of the movable cylinder (22) that can rotate around the axis is as follows: a second drive device (51) is provided on the frame (1), a mounting base (52) is provided on the frame (1), a spline shaft (53) is provided on the mounting base (52), the second drive device (51) is connected to the spline shaft (53) for transmission, a first synchronous pulley (54) is provided on the spline shaft (53), a second synchronous pulley (55) is connected to the movable cylinder (22), and the first synchronous pulley (54) and the second synchronous pulley (55) are connected for transmission through a synchronous belt (56).

4. An automatic sewing machine for curved surface products according to claim 3, characterized in that: The pre-fixed clamping mechanism includes an axial movement drive device (61), on which a mounting bracket (62) is connected. A push plate (63) is provided at the inner end of the mounting bracket (62), and pre-fixed clamping claws are provided on both sides of the mounting bracket (62). A downward pressure drive device (64) is also provided on the mounting bracket (62), and a downward pressure plate (65) is connected to the downward pressure drive device (64).

5. An automatic sewing machine for curved surface products according to claim 4, characterized in that: The pre-fixed gripper includes a first gripper drive device (71), a first drive connector (72), and a first chuck assembly (73). The middle part of the first drive connector (72) is hinged to the mounting bracket (62), one end of the first drive connector (72) is hinged to the first extension rod (71a) of the first gripper drive device (71), and the first chuck assembly (73) is fixed to the other end of the first drive connector (72).

6. An automatic sewing machine for curved surface products according to claim 5, characterized in that: The axial movement drive device (61) is disposed inside the fixed cylinder (21), and the fixed cylinder (21) is provided with an axial guide groove (21a). The axial movement drive device (61) is connected to the mounting bracket (62) through a first connecting rod (66), and the first connecting rod (66) extends out from the axial guide groove (21a).

7. An automatic sewing machine for curved surface products according to claim 6, characterized in that: The centering mechanism includes a centering drive device (81), a second connecting rod (82), and a push block (83). A moving block (81a) is connected to the centering drive device (81). The push block (83) is hinged to the fixed cylinder (21). The second connecting rod (82) is symmetrically arranged on both sides of the centering drive device (81). One end of the second connecting rod (82) is hinged to the moving block (81a), and the other end is hinged to the corresponding push block (83).

8. An automatic sewing machine for curved surface products according to claim 7, characterized in that: The fixed cylinder (21) has symmetrical circumferential guide grooves (21b) on both sides, and the push block (83) is provided with a guide rod (83a), which extends into the corresponding circumferential guide groove (21b).

9. An automatic sewing machine for curved surface products according to claim 8, characterized in that: The stitching clamping mechanism includes a second gripper drive device (91), a second drive connector (92), and a second clamping head assembly (93). The middle part of the second drive connector (92) is hinged to the movable cylinder (22). One end of the second drive connector (92) is hinged to the second extension rod (91a) of the second gripper drive device (91). The second clamping head assembly (93) is fixed to the other end of the second drive connector (92).

10. An automatic sewing machine for curved surface products according to claim 9, characterized in that: The movable cylinder (22) is provided with a positioning boss (22a).

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