Intelligent overspeed vamp sewing device for safety shoe production

Abstract

The invention relates to the technical field of vamp sewing, in particular to an intelligent vamp overspeed sewing device for safety shoe production. The invention provides an intelligent overspeed vamp sewing device for safety shoe production, which comprises a sewing machine body, the sewing machine body mainly comprises a base, a mounting table, a machine head, a sewing needle and the like, and a high column is arranged at the top of the base. Firstly, through cooperation of the telescopic rod and the top cap, the containing plate for containing cloth can be flexibly adjusted, and the position of the cloth can be continuously adjusted conveniently; secondly, through mutual cooperation of the pressing piece and the limiting piece, the spliced cloth can be clamped and positioned, the cloth is prevented from moving or dislocation in the sewing process, and the stability and the positioning accuracy of the cloth in the sewing process are ensured; and the downward moving position of the containing plate is locked through a sliding plate, a U-shaped clamping piece, a first plug pin, a force storage spring and the like, so that enough operation space is reserved between the containing plate and the pressing piece, workers can place the cloth conveniently, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of shoe upper sewing, and in particular to an intelligent overspeed shoe upper sewing device for producing safety shoes. Background Art

[0002] Safety shoes are a general term for safety shoes and protective shoes. They refer to shoes worn in different workplaces that protect the feet and legs from foreseeable injuries, while ordinary shoes do not have this specific protective function. Common safety shoes include: toe-protected anti-smash shoes, anti-puncture shoes, insulating shoes, anti-static shoes, conductive shoes, steelmaking shoes, rubber shoes, cold-proof shoes, etc.

[0003] The upper of safety shoes is usually made by stitching together multiple pieces of leather or other materials through fine manual or mechanical sewing processes. These leathers or materials are carefully selected and processed to ensure the durability, comfort and protection of the upper. Sewing the upper is a key step. Shoemaking craftsmen or machines will stitch the cut leather or other materials into predetermined shapes and sizes according to the design drawings. When stitching, it is necessary to ensure that each piece of material is accurately butt-jointed together to ensure the flatness and beauty of the upper.

[0004] However, in the existing upper sewing process, some steps still rely on workers to manually press the spliced ​​fabrics, which not only increases the workers' fatigue, but is also affected by the workers' proficiency, which may lead to unstable sewing quality; at the same time, during the sewing process, workers need to constantly adjust the position and pressing force of the fabrics, especially for uppers with a certain shape, but the existing work surfaces are mostly fixed and cannot adapt to safety shoe uppers of different shapes and sizes. When it is necessary to sew uppers with a certain shape, it may be difficult for workers to accurately place and adjust the fabrics on the work surface, thereby affecting the sewing quality and efficiency.

[0005] Based on the above situation, the present invention proposes an intelligent overspeed sewing device for uppers used in the production of safety shoes. Summary of the invention

[0006] In order to overcome the shortcomings of the existing upper sewing process, such as reliance on manual pressing by workers, unstable sewing quality, and the inability of the fixed work surface to adapt to uppers of different shapes and sizes, the technical problem is to provide an intelligent overspeed sewing device for uppers for safety shoe production.

[0007] The technical solution is: an intelligent overspeed sewing device for uppers of safety shoes, including a sewing machine body, which mainly includes a base, a mounting table, a machine head and a sewing needle, etc. A high column is provided on the top of the base, and the high column is located directly below the sewing needle. A rotary hook seat is installed in the high column, and a needle plate is provided on the top of the high column, and a fixed plate is fixedly connected to the high column; telescopic rods uniformly distributed along the circumferential direction are fixedly connected to the fixed plate, and a ball is provided at the top of the telescopic rod, and a containing plate is provided between the telescopic rods, and top caps uniformly distributed along the circumferential direction are fixedly connected to the bottom of the containing plate, each top cap has a spherical groove that fits the ball, and each ball is located in an adjacent spherical groove, and a pressure spring is connected between each top cap and the top of the fixed plate, and each pressure spring is wound around the adjacent telescopic rod, and each pressure spring is always in a compressed state.

[0008] Preferably, a connecting piece is provided at the head of the sewing machine body, a fixing ring is fixedly connected to the connecting piece, a plurality of clamping pieces are rotatably connected to the fixing ring, and the clamping pieces are in contact with the top of the containing plate.

[0009] Preferably, the fixing ring is further provided with a limiter for controlling its rotation degree on a side close to the clamping member, and torsion springs are connected between the clamping member and the adjacent limiter, each torsion spring is wound around the fixing ring, and each torsion spring always remains in a twisted state.

[0010] Preferably, the connecting member is fixedly connected to a guide rod, a sliding plate is slidably connected to the guide rod, a U-shaped clamping member is slidably connected inside the sliding plate, the U-shaped clamping member is clamped together with the containing plate, and a pin assembly with a fixed downward movement height is provided between the sliding plate and the U-shaped clamping member.

[0011] Preferably, the latch assembly includes an insertion rod, which is slidably connected to a sliding plate, a force storage spring is connected between the insertion rod and the sliding plate, the force storage spring is wound around the insertion rod, the force storage spring is always in a compressed state, and a slot is opened on the sliding plate to fit the force storage spring.

[0012] Preferably, an electric push rod is installed in the connecting member, the telescopic end of the electric push rod is fixedly connected to a guide member, a scale is provided on the outside of the guide member, a sliding block is slidably connected to the guide member, a wedge-shaped fastener is slidably connected to the sliding block, symmetrically distributed return springs are connected between the wedge-shaped fastener and the sliding block, and the symmetrically distributed return springs are all wound around the wedge-shaped fastener.

[0013] Preferably, a fixing piece is fixedly connected to the sliding block, and a cylinder is slidably connected to the side of the fixing piece close to the guide piece, a linear spring is connected between the cylinder and the fixing piece, the linear spring is wound around the fixing piece, and the linear spring is always in a compressed state, and the guide piece is provided with evenly distributed circular clamping holes, and the fixing piece is clamped with the guide piece through the circular clamping holes and the cylinder.

[0014] Preferably, a fixed column is provided in the head part of the sewing machine body, a connecting ring is fixedly connected to the fixed column, a screw is rotatably connected in the connecting ring, a sliding member is threadedly connected to the screw, the sliding member slides vertically on the fixed column, the connecting ring is fixedly connected to symmetrically distributed connecting rods, a presser foot is slidably connected between the symmetrically distributed connecting rods, the presser foot is provided with a roller for pressing fabric, the presser foot is sleeved on the fixed column, a coil spring is connected between the sliding member and the presser foot, and the coil spring is always in a compressed state.

[0015] The beneficial effects are as follows: firstly, the present invention can flexibly adjust the holding plate for placing the cloth through the cooperation of the telescopic rod and the top cap, so as to facilitate the continuous adjustment of the position of the cloth; secondly, through the cooperation between the clamping member and the limiting member, the spliced ​​cloth can be clamped and positioned to prevent the cloth from moving or misaligning during the sewing process, thereby ensuring the stability and positioning accuracy of the cloth during the sewing process; and then, the downward position of the holding plate is locked through the sliding plate, the U-shaped clamping member, the first latch, the force storage spring, etc., so that sufficient operating space is left between the holding plate and the clamping member, which is convenient for workers to place the cloth and improves work efficiency.

[0016] The present invention controls the guide member through an electric push rod to drive the wedge-shaped quick move downward to press the junction of the fabrics, eliminating the need for workers to continuously press manually, thereby reducing the labor intensity of the workers, and uses fixing members and cylinders to lock the position of the sliding block so that the position of the wedge-shaped quick pressing will not shift due to vibrations generated during work, thereby further improving the sewing effect.

[0017] The present invention realizes the function of flexibly adjusting the pressing force according to the thickness and material characteristics of the cloth through the ingenious cooperation of components such as the screw rod, the sliding part, the coil spring, and the presser foot, thereby providing more accurate and stable support for cloth sewing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the supporting member high column, fixed plate, telescopic rod and other components of the present invention.

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of components such as the pressure spring, the containing plate and the connecting piece of the present invention.

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the guide rod, sliding plate, plug rod and other components of the present invention.

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the electric push rod, guide member, sliding block and other components of the present invention.

[0023] Figure 6It is a schematic diagram of the three-dimensional structure of the fixing part, linear spring, cylinder and other components of the present invention.

[0024] Figure 7 It is a schematic diagram of the three-dimensional structure of the connecting ring, sliding member, screw and other components of the present invention.

[0025] Figure 8 It is a schematic diagram of the three-dimensional structure of the presser foot, the fixing column, the coil spring and other components of the present invention.

[0026] The meaning of the reference numerals in the figure are as follows: 1: sewing machine body, 11: high column, 12: fixed plate, 13: telescopic rod, 14: pressure spring, 15: holding plate, 151: top cap, 16: connecting piece, 1601: electric push rod, 1602: guide rod, 17: fixed ring, 18: limit piece, 19: torsion spring, 110: pressing piece, 111: sliding plate, 1111: U-shaped positioning piece, 112: insertion rod, 113: storage spring, 2: guide piece, 21: sliding block, 22: return spring, 23: wedge-shaped fast, 24: fixing piece, 25: linear spring, 26: cylinder, 3: connecting ring, 31: sliding piece, 32: screw, 33: presser foot, 34: fixing column, 35: coil spring, 36: connecting rod. DETAILED DESCRIPTION

[0027] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the present application and are not limited to the scope of the present application. The implementation conditions adopted in the examples can be further adjusted according to the conditions of the specific manufacturer, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0028] Example 1: Refer to the attached Figure 1-3 A device for intelligent overspeed sewing of uppers for producing safety shoes comprises a sewing machine body 1, wherein the sewing machine body 1 mainly comprises a base, a mounting platform, a machine head and a sewing needle, etc. A high column 11 is arranged on the top of the base, and the high column 11 is located directly below the sewing needle. A rotary hook seat is arranged in the high column 11, and a needle plate is arranged on the top of the high column 11, and a fixing plate 12 is fixedly connected to the high column 11.

[0029] During the sewing process, the needle plate is used to control the smaller moving range of the sewing needle to ensure that the fabric can pass smoothly through the sewing area during sewing. At the same time, the needle plate is usually provided with needle holes for the sewing needle to pass through so that the sewing needle can pass the thread through the fabric and form a stitch. The shuttle seat is located below the needle plate and is the key part for fixing the shuttle. When the sewing machine is working, the shuttle rotates at high speed under the support of the shuttle seat, and cooperates with the sewing needle to complete the formation of the stitch.

[0030] During the process of sewing the upper, the position of the fabric needs to be constantly adjusted. Especially for the upper with a certain concave shape, it is very important to adjust the position and tension of the fabric. In particular, considering the special needs of sewing the upper, greater flexibility and control are provided by adjustable components and devices. Therefore, in this embodiment, the table for placing the fabric during the sewing of the upper can be flexibly adjusted.

[0031] Specifically, the fixed plate 12 is fixedly connected with telescopic rods 13 evenly distributed along the circumferential direction, and the telescopic rods 13 are composed of two small sections of cylinders, and the arrangement order of these small sections from bottom to top is gradually thinner, and a ball is provided on the top of the thin cylinder. A holding plate 15 is provided between the telescopic rods 13, and the bottom of the holding plate 15 is fixed with top caps 151 evenly distributed along the circumferential direction. The number of top caps 151 is equal to the number of telescopic rods 13, and each top cap 151 has a spherical groove that fits the ball, and each ball is located in an adjacent spherical groove. A pressure spring 14 is connected between each top cap 151 and the top of the fixed plate 12, and each pressure spring 14 is wound around the adjacent telescopic rod 13, and each pressure spring 14 is always in a compressed state.

[0032] When the worker places the spliced ​​fabric on the holding plate 15, and spreads the part to be sewn on the needle plate on the top of the high column 11, the sewing machine body 1 is controlled to drive the sewing needle to move up and down to achieve sewing. When the fabric needs to be adjusted, especially the heel part of the shoe upper with a certain shape, because it is not flat, when adjusting the position of the fabric, the worker can press locally around the holding plate 15 as needed to make the holding plate 15 partially tilted downward, the corresponding pressure spring 14 will be deformed, and the corresponding other side will be tilted upward, so that the position of the fabric can be flexibly adjusted during the sewing process of the shoe upper.

[0033] During the sewing process of the upper, workers need to manually press and position the uppers made of multiple pieces of fabric, which not only increases the labor intensity of the workers, but also often cannot guarantee the accuracy of each pressing and positioning, which may affect the flatness and sewing quality of the upper. Therefore, in this embodiment, the spliced ​​fabrics are clamped and positioned during the sewing process of the upper.

[0034] Reference Figure 3 Specifically, a connecting member 16 is provided at the head of the sewing machine body 1, and a fixing ring 17 is fixedly connected to the connecting member 16. A plurality of pressing members 110 are rotatably connected to the fixing ring 17, and the pressing members 110 are in contact with the top of the holding plate 15. When the holding plate 15 is partially pressed, the holding plate 15 will be tilted up with one side downward and the other side upward, so that the fabric on the tilted side continues to be pressed to avoid changing the positioning due to adjusting the fabric.

[0035] The fixing ring 17 is also provided with a limiter 18 for controlling the rotation degree of the pressing member 110 on one side thereof, and the number of the limiters 18 is equal to the number of the pressing members 110. A torsion spring 19 is connected between the pressing member 110 and the adjacent limiters 18, and each torsion spring 19 is wound around the fixing ring 17, and the torsion spring 19 is always kept in a twisted state. When one side of the placing plate 15 tilts upward, the placing plate 15 will push the pressing member 110 on that side upward to deflect it upward, while the pressing member 110 on the side tilting downward will remain motionless due to being pressed by the adjacent limiters 18, and other splicing fabrics can be placed at the tilted position.

[0036] Reference Figure 4 In this embodiment, the various spliced ​​fabrics for shoemaking are placed on the holding plate 15. Since the pressing member 110 is always pressed on the holding plate 15, in order to facilitate the placement of the fabrics, the holding plate 15 needs to be moved down to separate from the pressing member 110, so that a certain operating space is left between the holding plate 15 and the pressing member 110. This embodiment adopts the following technical solution: the connecting member 16 is fixedly connected to a guide rod 1602, a sliding plate 111 is slidably connected to the guide rod 1602, a U-shaped clamping member 1111 is slidably connected to the sliding plate 111, the U-shaped clamping member 1111 is clamped and matched with the holding plate 15, and a latch assembly with a fixed downward movement height is provided between the sliding plate 111 and the U-shaped clamping member 1111.

[0037] The latch assembly includes a first latch 112, which is slidably connected to a sliding plate 111. A force storage spring 113 is connected between the first latch 112 and the sliding plate 111. The force storage spring 113 is wound around the first latch 112. The force storage spring 113 is always in a compressed state. A slot is opened on the sliding plate 111 to fit the force storage spring 113.

[0038] When it is necessary to place cloth on the holding plate 15, the staff directly presses the holding plate 15 downward, the telescopic rod 13 contracts downward, and the pressure spring 14 continues to be compressed, thereby driving the U-shaped clamping piece 1111 to move downward. When the slot on the U-shaped clamping piece 1111 is aligned with the first pin 112, under the elastic force of the storage spring 113, the first pin 112 will be inserted into the U-shaped clamping piece 1111. At this time, the downward position of the U-shaped clamping piece 1111 is fixed, thereby locking the position of the holding plate 15. At this time, there is operating space between the holding plate 15 and the clamping piece 110, which is convenient for workers to place the cloth on the holding plate 15.

[0039] When all the spliced ​​fabrics are placed on the placing plate 15 as designed, it is only necessary to pull the first latch 112 outward to release the lock. Then, under the elastic force of the pressure spring 14, the placing plate 15 will drive the U-shaped positioning member 1111 to move upward and reset. The placing plate 15 will drive the fabric to move upward and contact the clamping member 110. The clamping member 110 will press the periphery of the fabric to position it. The first latch 112 is released, and the first latch 112 slides inward until it is pressed by the U-shaped positioning member 1111, compressing the storage spring 113.

[0040] When the joints of the fabrics on the holding plate 15 are sewn and need to be embellished with some more fabrics, the sliding plate 111 can be pushed away from the connecting piece 16, thereby driving the U-shaped locking piece 1111 to move until it no longer blocks the holding plate 15. At this time, the holding plate 15 can be partially pressed as needed. For example, pressing at the place where embellishment is needed will cause this part of the holding plate 15 to drop downward to obtain operating space, and then the corresponding embellishment fabric can be placed.

[0041] Example 2: Refer to the attached Figure 5-6 , an electric push rod 1601 is installed in the connecting member 16, the telescopic end of the electric push rod 1601 is fixedly connected to the guide member 2, a scale is arranged on the outside of the guide member 2, a sliding block 21 is slidably connected in the guide member 2, a wedge-shaped block 23 is slidably connected in the sliding block 21, symmetrically distributed return springs 22 are connected between the wedge-shaped block 23 and the sliding block 21, and the symmetrically distributed return springs 22 are all wound on the wedge-shaped block 23. When the electric push rod 1601 controls the guide member 2 to drive the sliding block 21 to move downward, the wedge-shaped block 23 is driven to move downward to press on the intersection of the cloth, and the return spring 22 will be slightly deformed.

[0042] The sewing machine body may produce slight vibrations when working, especially when sewing hard or thick fabrics. Since greater force and higher speed are required to complete the sewing, the vibration amplitude of the machine may increase accordingly, which may easily cause the position of the sliding block 21 on the guide member 2 to change. Therefore, the sliding block 21 that has been adjusted needs to be locked.

[0043] Specifically, the sliding block 21 is fixed with a fixing member 24, and a cylinder 26 is slidably connected to the side of the fixing member 24 close to the guide member 2. A linear spring 25 is connected between the cylinder 26 and the fixing member 24, and the linear spring 25 is wound around the fixing member 24. The linear spring 25 is always in a compressed state. The guide member 2 is provided with evenly distributed circular clamping holes, and the fixing member 24 is clamped and matched with the guide member 2 through the circular clamping holes and the cylinder 26. When the sliding block 21 moves to a suitable position, the sliding block 21 will drive the cylinder 26 to move together through the fixing member 24. When the cylinder 26 is aligned with the clamping hole, the cylinder 26 will automatically extend into the clamping hole under the elastic force of the linear spring 25 to lock the position of the sliding block 21.

[0044] During the sewing process, the sewing machine body 1 generally has a presser foot, which is mainly used to help control and guide the fabric to ensure the accuracy and quality of sewing. Since some shoe uppers may be made of thicker materials, such as winter shoes, thicker fabrics are often used. Therefore, the force of the presser foot on the fabric may increase accordingly, especially for leather materials such as cowhide. Excessive force may cause damage to the leather, such as indentation or wear. Therefore, the pressure of the presser foot needs to be flexibly adjusted.

[0045] Reference Figure 7-8 Specifically, a fixed column 34 is provided in the head part of the sewing machine body 1. During the sewing process, under the control of the head, the fixed column 34 will automatically move down. When sewing is finished, the fixed column 34 will also automatically move up and reset. A connecting ring 3 is fixedly connected to the fixed column 34, and a screw rod 32 is rotatably connected to the connecting ring 3. A sliding member 31 is threadedly connected to the screw rod 32. The sliding member 31 slides vertically on the fixed column 34. Turning the screw rod 32 will drive the sliding member 31 to move up and down.

[0046] The connecting ring 3 is fixedly connected with symmetrically distributed connecting rods 36, and a presser foot 33 is slidably connected between the symmetrically distributed connecting rods 36. The presser foot 33 is provided with a roller for pressing the cloth, which is used to control and guide the cloth. The presser foot 33 is sleeved on the fixed column 34, and a coil spring 35 is connected between the sliding member 31 and the presser foot 33. The coil spring 35 is always in a compressed state. A U-shaped notch is opened on the side of the presser foot 33 close to the screw rod 32, and the sliding member 31 passes through the U-shaped notch.

[0047] When sewing the shoe upper, the fixed column 34 is controlled by the transmission system in the machine head to drive the presser foot 33 to move downward, so that the roller on the presser foot 33 is pressed on the intersection of the fabric. If the fabric is very thick, the pressing force of the presser foot 33 is too large. At this time, the staff can turn the screw rod 32 in the forward direction to drive the sliding member 31 to move upward. At the same time, under the elastic force of the coil spring 35, the presser foot 33 will move upward slightly, so that the pressing force of the presser foot 33 is relatively reduced. On the contrary, if the fabric material is thin or slippery, the pressing force needs to be increased, and the screw rod 32 is turned in the reverse direction to move the sliding member 31 downward, increase the deformation strength of the coil spring 35, and thus increase the pressing force of the presser foot 33.

[0048] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An intelligent overspeed sewing device for uppers of safety shoes, comprising a sewing machine body (1), the sewing machine body (1) mainly comprising a base, a mounting platform, a machine head and a sewing needle, etc., a high column (11) is provided on the top of the base, the high column (11) is located directly below the sewing needle, a rotary hook seat is installed in the high column (11), a needle plate is provided on the top of the high column (11), and a fixing plate (12) is fixedly connected to the high column (11); the characteristics are: The fixed plate (12) is fixedly connected with telescopic rods (13) evenly distributed along the circumferential direction, and a sphere is arranged at the top of the telescopic rods (13). A receiving plate (15) is arranged between the telescopic rods (13), and a top cap (151) evenly distributed along the circumferential direction is fixedly connected to the bottom of the receiving plate (15). A spherical groove is formed in each top cap (151) to fit the sphere, and each sphere is located in an adjacent spherical groove. A pressure spring (14) is connected between each top cap (151) and the top of the fixed plate (12), and each pressure spring (14) is wound around an adjacent telescopic rod (13), and each pressure spring (14) is always in a compressed state.

2. The intelligent overspeed sewing device for uppers of safety shoes according to claim 1, characterized in that: A connecting piece (16) is provided at the head of the sewing machine body (1), a fixing ring (17) is fixedly connected to the connecting piece (16), a plurality of pressing pieces (110) are rotatably connected to the fixing ring (17), and the pressing pieces (110) are in contact with the top of the containing plate (15).

3. The intelligent overspeed sewing device for uppers of safety shoes according to claim 2, characterized in that: The fixing ring (17) is also provided with a limiting member (18) for controlling the rotation degree thereof on a side close to the pressing member (110), and a torsion spring (19) is connected between the pressing member (110) and the adjacent limiting member (18), and each torsion spring (19) is wound around the fixing ring (17), and each torsion spring (19) always remains in a twisted state.

4. The intelligent overspeed sewing device for uppers of safety shoes according to claim 1, characterized in that: The connecting member (16) is fixedly connected to a guide rod (1602), a sliding plate (111) is slidably connected to the guide rod (1602), a U-shaped clamping member (1111) is slidably connected inside the sliding plate (111), the U-shaped clamping member (1111) is clamped and matched with the containing plate (15), and a latch assembly for fixing the downward movement height is provided between the sliding plate (111) and the U-shaped clamping member (1111).

5. The intelligent overspeed sewing device for uppers of safety shoes according to claim 4, characterized in that: The latch assembly comprises an insertion rod (112), the insertion rod (112) is slidably connected to a sliding plate (111), a force storage spring (113) is connected between the insertion rod (112) and the sliding plate (111), the force storage spring (113) is wound around the insertion rod (112), the force storage spring (113) is always in a compressed state, and a slot is provided on the sliding plate (111) to fit with the force storage spring (113).

6. An intelligent overspeed sewing device for uppers of safety shoes according to any one of claims 1 to 5, characterized in that: An electric push rod (1601) is installed in the connecting member (16), the telescopic end of the electric push rod (1601) is fixedly connected to a guide member (2), a scale is provided on the outer side of the guide member (2), a sliding block (21) is slidably connected in the guide member (2), a wedge-shaped block (23) is slidably connected in the sliding block (21), symmetrically distributed return springs (22) are connected between the wedge-shaped block (23) and the sliding block (21), and the symmetrically distributed return springs (22) are all wound around the wedge-shaped block (23).

7. The intelligent overspeed sewing device for uppers of safety shoes according to claim 6, characterized in that: A fixing member (24) is fixedly connected to the sliding block (21); a cylinder (26) is slidably connected to the fixing member (24) on one side close to the guide member (2); a linear spring (25) is connected between the cylinder (26) and the fixing member (24); the linear spring (25) is wound around the fixing member (24); the linear spring (25) is always in a compressed state; the guide member (2) is provided with evenly distributed circular clamping holes; the fixing member (24) is clamped and matched with the guide member (2) through the circular clamping holes and the cylinder (26).

8. The intelligent overspeed sewing device for uppers of safety shoes according to claim 1, characterized in that: A fixed column (34) is provided in the head portion of the sewing machine body (1), a connecting ring (3) is fixedly connected to the fixed column (34), a screw rod (32) is rotatably connected to the connecting ring (3), a sliding member (31) is threadedly connected to the screw rod (32), and the sliding member (31) slides vertically on the fixed column (34), the connecting ring (3) is fixedly connected to symmetrically distributed connecting rods (36), a presser foot (33) is slidably connected between the symmetrically distributed connecting rods (36), the presser foot (33) is provided with a roller for pressing fabric, the presser foot (33) is sleeved on the fixed column (34), a coil spring (35) is connected between the sliding member (31) and the presser foot (33), and the coil spring (35) is always in a compressed state.

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