A multi-needle sewing machine support frame

Abstract

The utility model discloses a kind of multi-needle sewing machine support frames, the utility model relates to multi-needle sewing machine technical field;The utility model includes first mounting plate, first mounting plate side is equipped with second mounting plate, the one end of second mounting plate close to first mounting plate is equipped with first bearing, the other end of first bearing is equipped with first rotating shaft, first rotating shaft is equipped with down roller, the one end of first rotating shaft away from first bearing is equipped with ratchet wheel, ratchet wheel is equipped with ratchet tooth;The multi-needle sewing machine support frame of the present application is clamped by the down roller and the down roller ratchet wheel pawl anti-reversing structure of setting upper pressing roller, the clamping state of two pressing rollers can be adjusted adaptively with fabric thickness, can stably adhere to the surface of fabric of different material, thickness, avoid the damage of thin fabric due to excessive extrusion, prevent the skidding problem when thick fabric is transported, ensure that fabric always keeps flat, uniform speed in the whole sewing process.

Description

Technical Field

[0001] This utility model relates to the field of multi-needle sewing machine technology, and in particular to a support frame for a multi-needle sewing machine. Background Technology

[0002] In mass production scenarios such as clothing and home textiles, multi-needle sewing machines are key equipment for improving production efficiency because they can complete multiple stitching operations simultaneously. The support frame of a multi-needle sewing machine, as the core component for supporting the equipment and conveying fabric, directly affects the sewing quality due to its fabric conveying stability. Currently, most multi-needle sewing machine support frames on the market are equipped with upper and lower pressure rollers. The fabric is sandwiched between the two rollers, and continuous fabric conveying is achieved through the rotation of the rollers, avoiding wrinkles or misalignment problems that occur when manually pushing the fabric. Simultaneously, to prevent the pressure rollers from rotating in the opposite direction due to external forces such as the fabric's own weight or sewing machine vibration during fabric conveying, which could cause fabric backing and stitch misalignment, some support frames add a ratchet and pawl mechanism to one end of the pressure roller. This mechanical anti-reverse structure, with its high reliability and no need for electric drive, has become a common auxiliary design in multi-needle sewing machine support frames to ensure stable unidirectional fabric conveying. It is widely used in sewing of thick materials, such as denim, canvas, or multi-layered fabric splicing, where high conveying accuracy is required.

[0003] Although the existing multi-needle sewing machine support frame with its upper pressure roller, lower pressure roller, and ratchet pawl combination structure can achieve basic fabric feeding and anti-reverse functions, there are still obvious defects in practical applications. First, adjusting the clamping force of the pressure rollers in most support frames is difficult. Either the clamping force is too strong, causing thin fabrics to be squeezed and deformed, damaging the fibers, or the clamping force is insufficient, causing thick fabrics to slip during transport. This makes it unsuitable for sewing needs of fabrics of different thicknesses. Second, the ratchet and pawl mechanism has poor stability. After long-term use, the pawl is prone to jamming or disengagement due to wear, leading to the failure of the anti-reverse function. This results in fabric rollback and stitch wrinkling, requiring frequent machine downtime for maintenance and parts replacement, impacting production efficiency. Furthermore, the existing connection structure between the pressure rollers and support frames is mostly a fixed design. When the pressure roller surface shows wear, such as aging or scratches on the roller surface, replacement requires disassembling the support frame side cover and multiple fixing bolts, which is cumbersome. Moreover, the compatibility between pressure rollers and support frames is poor for different models of multi-needle sewing machines, making quick replacement difficult and further increasing equipment maintenance costs and downtime.

[0004] Therefore, a new multi-needle sewing machine support frame is proposed to solve the above problems. Utility Model Content

[0005] 1. Technical problems to be solved

[0006] The purpose of this utility model is to provide a support frame for a multi-needle sewing machine, which solves the problem that although the existing multi-needle sewing machine support frame with upper pressure roller, lower pressure roller and ratchet pawl combination structure can achieve basic fabric feeding and anti-reverse functions, there are still obvious defects in actual use. First, adjusting the clamping force of the pressure rollers in most support frames is difficult. Either the clamping force is too strong, causing thin fabrics to be squeezed and deformed, damaging the fibers, or the clamping force is insufficient, causing thick fabrics to slip during transport. This makes it unsuitable for sewing needs of fabrics of different thicknesses. Second, the ratchet and pawl mechanism has poor stability. After long-term use, the pawl is prone to wear and jamming or disengagement, leading to the failure of the anti-reverse function. This results in fabric rollback and stitch wrinkling, requiring frequent downtime for maintenance and component replacement, impacting production efficiency. Furthermore, the existing connection structure between the pressure rollers and support frames is mostly a fixed design. When the pressure roller surface shows wear, such as aging or scratches on the roller surface, replacement requires disassembling the support frame side cover and multiple fixing bolts, which is cumbersome. Moreover, the compatibility between pressure rollers and support frames is poor for different models of multi-needle sewing machines, making quick replacement difficult and further increasing equipment maintenance costs and downtime.

[0007] 2. Technical Solution To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to a support frame for a multi-needle sewing machine, comprising a first mounting plate, a second mounting plate mounted on one side of the first mounting plate, a first bearing mounted on one end of the second mounting plate near the first mounting plate, a first rotating shaft mounted on the other end of the first bearing, a lower pressure roller mounted on the first rotating shaft, and a ratchet mounted on the end of the first rotating shaft away from the first bearing, the ratchet having ratchet teeth that engage with the tooth grooves of the ratchet, an upper pressure roller mounted on the upper end of the lower pressure roller, a second rotating shaft passing through the upper pressure roller, second bearings mounted on both ends of the second rotating shaft, a movable block mounted on the other end of the right end of the second bearing, a sliding groove formed at the opposite ends of the first and second mounting plates, the movable block being mounted in the sliding groove of the first mounting plate, a lead screw passing through the movable block and mounted in the sliding groove of the first mounting plate, a second connecting hole formed on the second mounting plate, the second rotating shaft passing through the second connecting hole, and the ratchet located at the end of the first mounting plate away from the second mounting plate.

[0008] Furthermore, the outer surfaces of both the lower and upper pressure rollers are provided with resistance grooves. This design greatly increases the friction between the two pressure rollers and the fabric, preventing the fabric from slipping against the two pressure roller supports.

[0009] Furthermore, a third connecting hole is provided on the first mounting plate. A third rotating shaft is installed at the end of the ratchet near the first mounting plate. The third rotating shaft passes through the third connecting hole. A fourth bearing is installed at the end of the third rotating shaft away from the ratchet. The fourth bearing is connected to the end of the first mounting plate near the second mounting plate. This design can provide stable support for the pawl and prevent it from disengaging from the ratchet.

[0010] Furthermore, a first connecting hole is provided on the first mounting plate, which is connected to a sliding groove on the first mounting plate. The lead screw passes through the first connecting hole, and a motor is installed at the upper end of the lead screw. The motor is connected to the upper end of the first mounting plate. This design allows the motor to be started, which drives the lead screw to rotate. When the lead screw rotates, it drives the moving block to move up and down. When the moving block moves, it drives the second rotating shaft to move synchronously through the second bearing. When the second rotating shaft rotates, it drives the upper pressure roller to move, thereby adjusting the distance between the two pressure rollers and making it adaptable to fabrics of different thicknesses.

[0011] Furthermore, a third bearing is installed at the bottom of the sliding groove on the first mounting plate, and the upper end of the third bearing is connected to one end of the lead screw. This design can effectively reduce the wear of the lead screw and increase the service life of the device.

[0012] Furthermore, a slider is installed on the left end of the second bearing on the left side. The slider is slidably connected in a sliding groove opened on the second mounting plate. This design can effectively reduce the stress on the lead screw caused by the upper pressure roller.

[0013] Furthermore, a base plate is installed at the bottom of the first mounting plate, the upper end of the base plate is connected to the bottom of the second mounting plate, and brackets are installed at the four corners of the bottom of the base plate.

[0014] 3. Beneficial effects Compared with existing technologies, the advantages of this utility model are: This multi-needle sewing machine support frame features an upper and lower pressure roller clamping mechanism and a ratchet and pawl anti-reverse structure on the lower pressure roller. The clamping state of the two pressure rollers can adaptively adjust according to the fabric thickness, ensuring a stable fit to fabrics of different materials and thicknesses. This avoids damage to thin fabrics caused by excessive compression and prevents slippage when conveying thick fabrics, ensuring that the fabric remains flat and conveyed at a uniform speed throughout the sewing process, providing a foundation for the neatness of multi-needle stitches. Secondly, the ratchet and pawl mechanism at one end of the lower pressure roller has a tight fit, which can precisely limit the reverse rotation of the pressure roller. Even when the sewing machine is running at high speed and generating strong vibrations, or when conveying heavy fabrics and encountering significant resistance, it can still reliably prevent the fabric from rolling back, effectively avoiding rework of the stitches due to fabric misalignment and improving the pass rate of sewing products.

[0015] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural diagram showing the installation configuration of this utility model; Figure 2 This is a structural diagram of the first mounting plate of this utility model; Figure 3 This is a structural diagram of the lower pressure roller of this utility model; Figure 4 This is a structural diagram of the upper pressure roller of this utility model; Figure 5 This is a structural diagram of the ratchet pawl of this utility model.

[0018] The attached diagram lists the components represented by each number as follows: 110. Base plate; 111. Bracket; 120. First mounting plate; 121. First connecting hole; 122. Second connecting hole; 123. Third connecting hole; 130. Second mounting plate; 131. Sliding groove; 210. Upper pressure roller; 211. First rotating shaft; 212. Ratchet; 213. First bearing; 220. Lower pressure roller; 221. Second rotating shaft; 222. Second bearing; 223. Moving block; 224. Lead screw; 225. Third bearing; 226. Motor; 227. Slider; 230. Ratchet; 231. Third rotating shaft; 232. Fourth bearing. Detailed Implementation

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0023] Please see Figure 1-5As shown, this embodiment is a support frame for a multi-needle sewing machine, including a first mounting plate 120. A second mounting plate 130 is mounted on one side of the first mounting plate 120. A first bearing 213 is mounted on one end of the second mounting plate 130 near the first mounting plate 120. A first rotating shaft 211 is mounted on the other end of the first bearing 213. A lower pressure roller 220 is mounted on the first rotating shaft 211. A ratchet 212 is mounted on the end of the first rotating shaft 211 away from the first bearing 213. The ratchet 212 has ratchet teeth 230 that engage with the grooves of the ratchet 212. An upper pressure roller 210 is mounted on the upper end of the lower pressure roller 220. A second rotating shaft 210 is mounted through the upper pressure roller 210. The second rotating shaft 221 has second bearings 222 installed at both ends. A moving block 223 is installed at the other end of the second bearing 222 on the right side. A sliding groove 131 is provided at the opposite ends of the first mounting plate 120 and the second mounting plate 130. The moving block 223 is installed in the sliding groove 131 of the first mounting plate 120. A lead screw 224 is installed through the moving block 223 and is also installed in the sliding groove 131 of the first mounting plate 120. A second connecting hole 122 is provided on the second mounting plate 130, and the second rotating shaft 221 passes through the second connecting hole 122. The ratchet 212 is located at the end of the first mounting plate 120 away from the second mounting plate 130. Resistance grooves are provided on the outer surfaces of both the lower pressure roller 220 and the upper pressure roller 210. A third connecting hole 123 is provided on the first mounting plate 120. A third rotating shaft 231 is installed at the end of the ratchet 230 near the first mounting plate 120. The third rotating shaft 231 passes through the third connecting hole 123. A fourth bearing 232 is installed at the end of the third rotating shaft 231 away from the ratchet 230. The fourth bearing 232 is connected to the end of the first mounting plate 120 near the second mounting plate 130. A first connecting hole 121 is provided on the first mounting plate 120. The first connecting hole 121 is connected to a sliding groove 131 on the first mounting plate 120. A lead screw 224 passes through the first connecting hole 121. A motor 226 is installed at the upper end of the lead screw 224. The motor 226 is connected to the upper end of the first mounting plate 120. A third bearing 225 is installed at the bottom end of the sliding groove 131 on the first mounting plate 120. The upper end of the third bearing 225 is connected to one end of the lead screw 224. A slider 227 is installed on the left end of the second bearing 222 on the left side. The slider 227 is slidably connected in a sliding groove 131 opened on the second mounting plate 130. A base plate 110 is installed at the bottom end of the first mounting plate 120. The upper end of the base plate 110 is connected to the bottom end of the second mounting plate 130. A bracket 111 is installed at each of the four corners of the bottom end of the base plate 110.

[0024] Working principle: When the thickness of the fabric to be processed changes, the motor 226 is started. The motor 226 drives the lead screw 224 to rotate. When the lead screw 224 rotates, it drives the moving block 223 to move up and down. When the moving block 223 moves, it drives the second rotating shaft 221 to move synchronously through the second bearing 222. When the second rotating shaft 221 rotates, it drives the upper pressure roller 210 to move, which is used to adjust the distance between the two pressure rollers. After the distance between the upper pressure roller 210 and the lower pressure roller 220 is adjusted, the work is carried out. It is confirmed that the pawl and the tooth groove of the ratchet 212 are tightly engaged, without any signs of jamming or wear, to ensure that the anti-reverse function can be used normally. Subsequently, one end of the fabric is laid flat on the worktable of the support frame, aligned with the clamping area of ​​the upper pressure roller 210 and the lower pressure roller 220, completing the fabric positioning before sewing. After starting the multi-needle sewing machine, the equipment's power system drives the lower pressure roller 220 to rotate clockwise in the conveying direction, while the upper pressure roller 210 rotates counterclockwise synchronously under the action of fabric friction. During the sewing process, the needle of the multi-needle sewing machine moves up and down at high speed, processing the fabric being conveyed. At this stage, if external factors, such as the fabric sagging due to its own weight or sewing machine vibration, generate a reverse force attempting to push the lower pressure roller 220 to rotate counterclockwise in the retraction direction, the ratchet 212 at one end of the lower pressure roller 220 will also tend to rotate counterclockwise. At this time, the pawl will quickly engage in the tooth groove of the ratchet 212, mechanically restricting the ratchet 212 from rotating in the reverse direction, thereby preventing the lower pressure roller 220 from retracting and avoiding the fabric moving in the opposite direction with the pressure roller. Meanwhile, the upper pressure roller 210 always remains clamped to the lower pressure roller 220, continuously adhering to the fabric surface. In conjunction with the forward rotation of the pressure roller, it ensures that the fabric is conveyed at a uniform speed, preventing uneven stitch spacing or wrinkling due to fluctuations in conveying speed, and ensuring the neatness and sewing quality of multi-needle stitches.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A support frame for a multi-needle sewing machine, characterized in that, include: A first mounting plate (120) is provided, and a second mounting plate (130) is mounted on one side of the first mounting plate (120). A first bearing (213) is mounted on one end of the second mounting plate (130) near the first mounting plate (120). A first rotating shaft (211) is mounted on the other end of the first bearing (213). A lower pressure roller (220) is mounted on the first rotating shaft (211). A ratchet (212) is mounted on the end of the first rotating shaft (211) away from the first bearing (213). A ratchet tooth (230) is mounted on the ratchet (212), and the ratchet tooth (230) engages with the tooth groove of the ratchet (212). An upper pressure roller (210) is mounted on the upper end of the lower pressure roller (220). A second rotating shaft (221) is mounted through the upper pressure roller (210). A second bearing (222) is installed at both ends of the rotating shaft (221). A moving block (223) is installed at the other end of the second bearing (222) on the right end. A sliding groove (131) is opened at the opposite end of the first mounting plate (120) and the second mounting plate (130). The moving block (223) is installed in the sliding groove (131) of the first mounting plate (120). A lead screw (224) is installed through the moving block (223). The lead screw (224) is installed in the sliding groove (131) of the first mounting plate (120). A second connecting hole (122) is opened on the second mounting plate (130). The second rotating shaft (221) passes through the second connecting hole (122). The ratchet (212) is located at the end of the first mounting plate (120) away from the second mounting plate (130).

2. The multi-needle sewing machine support frame according to claim 1, characterized in that, The outer surfaces of both the lower pressure roller (220) and the upper pressure roller (210) are provided with resistance grooves.

3. The multi-needle sewing machine support frame according to claim 1, characterized in that, The first mounting plate (120) has a third connecting hole (123). A third rotating shaft (231) is installed on the end of the ratchet (230) near the first mounting plate (120). The third rotating shaft (231) passes through the third connecting hole (123). A fourth bearing (232) is installed on the end of the third rotating shaft (231) away from the ratchet (230). The fourth bearing (232) is connected to the end of the first mounting plate (120) near the second mounting plate (130).

4. A multi-needle sewing machine support frame according to claim 1, characterized in that, The first mounting plate (120) has a first connecting hole (121) which is connected to the sliding groove (131) on the first mounting plate (120). The lead screw (224) passes through the first connecting hole (121) and a motor (226) is installed at the upper end of the lead screw (224). The motor (226) is connected to the upper end of the first mounting plate (120).

5. A multi-needle sewing machine support frame according to claim 1, characterized in that, A third bearing (225) is installed at the bottom of the sliding groove (131) opened on the first mounting plate (120), and the upper end of the third bearing (225) is connected to one end of the lead screw (224).

6. A multi-needle sewing machine support frame according to claim 1, characterized in that, A slider (227) is installed on the left end of the second bearing (222) on the left side. The slider (227) is slidably connected in a sliding groove (131) opened on the second mounting plate (130).

7. A multi-needle sewing machine support frame according to claim 1, characterized in that, The bottom end of the first mounting plate (120) is equipped with a base plate (110), the upper end of the base plate (110) is connected to the bottom end of the second mounting plate (130), and brackets (111) are installed at the four corners of the bottom end of the base plate (110).

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