A material fixing device for a double needle sewing process
By designing a material fixing device for handmade leather goods, a foot pedal is used to drive a pulling component to pull the clamping plate, which solves the problems of unstable material fixing and difficulty in fine adjustment, achieving stable clamping and precise sewing, and improving operating comfort and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIHUA 3514 LEATHER & FOOTWARE
- Filing Date
- 2025-06-05
- Publication Date
- 2026-06-16
AI Technical Summary
In traditional handmade leather goods making, the material is not fixed stably during the double-needle sewing process, which leads to muscle fatigue of the operator, poor clamping stability, low precision of the sewing trajectory, and inability to make fine adjustments to the position of the leather.
A material fixing device is designed, comprising a first clamping plate, a second clamping plate, a spring, a pedal, and a pulling component. The second clamping plate is pulled by the pulling component driven by the foot pedal, and the elastic force of the spring is used to achieve stable clamping and fine adjustment of the material.
It improves the stability of material fixation and the flexibility of leather fine-tuning, ensures the precision of stitching, and enhances operator comfort and work efficiency.
Smart Images
Figure CN224362992U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of handicraft production, specifically a material fixing device for double-needle sewing. Background Technology
[0002] In traditional leather crafting, small items such as leather keychains and decorative pendants are sewn using a double-needle hand stitching technique. This technique requires the operator to hold a needle in each hand and alternately pierce the leather to sew it together. Because the operator needs to hold needles with both hands during the sewing process, they cannot free their hands to hold the leather in place. Current techniques generally use a leg clamping device to hold the leather in place. Specifically, two independent clamps are used to hold the leather, and then the two clamps are placed between the operator's legs, using the legs to hold the two clamps in place to maintain the leather's stability.
[0003] However, the above-mentioned leather fixing methods have the following drawbacks: First, the operator needs to maintain continuous leg muscle contraction for a long time to maintain the clamping force, which can easily lead to muscle fatigue and seriously affect operational comfort and work efficiency. Second, the human leg will usually produce unavoidable slight swaying, which will reduce the clamping stability and cause the leather to move during sewing, directly affecting the accuracy of the stitch trajectory. Third, during double-needle sewing, the position of the leather needs to be finely adjusted at certain process nodes to adapt to complex stitching directions, such as adjusting the sewing position, releasing stitch tension, or dealing with corners. When using the above-mentioned leg clamping fixing device to finely adjust the position of the leather, it essentially relies on the coordinated operation of the hands and legs. That is, the operator needs to adjust the leg clamping force while holding two clamps with the hands to prevent the clamps from shifting when they loosen. However, because both hands are holding needles, the operator cannot complete this operation simultaneously, thus failing to meet the need for fine-tuning the position of the leather in double-needle sewing. Utility Model Content
[0004] To address the aforementioned shortcomings in the existing technology, this utility model aims to provide a material fixing device for double-needle sewing processes, which satisfies the requirements of stability when fixing leather and flexibility when fine-tuning leather, while ensuring sewing accuracy and improving operator comfort.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0006] A material securing device for double-needle sewing process, comprising:
[0007] The first clamping plate fixed to the ground;
[0008] A second clamping plate is hinged to the ground, and the second clamping plate swings about its hinge axis toward or away from the first clamping plate.
[0009] A spring is fixedly connected between the first clamping plate and the second clamping plate. The extension and retraction direction of the spring is horizontal. In the free state of the spring, the clamping surface of the first clamping plate abuts against the clamping surface of the second clamping plate.
[0010] The pedal is hinged to the ground, and its axis of rotation is parallel to the axis of rotation of the second clamping plate.
[0011] A pull member is fixedly connected between the pedal and the second clamping plate. The distance from the connection point between the pedal and the pull member to the connection point between the second clamping plate and the pull member is adapted to the length of the pull member. The connection point between the second clamping plate and the pull member is located close to the clamping surface of the second clamping plate.
[0012] As a limitation of this utility model: the first clamping plate and the second clamping plate are symmetrically arranged. The first clamping plate includes a vertical plate and an arc-shaped plate fixed to the top of the vertical plate. The arc-shaped plate of the first clamping plate is bent toward the second clamping plate, and the arc-shaped plate of the second clamping plate is bent toward the first clamping plate. The top of the arc-shaped plate of the first clamping plate abuts against the top of the arc-shaped plate of the second clamping plate.
[0013] As a limitation of this utility model: the first clamping plate and the second clamping plate are symmetrically arranged. The first clamping plate includes a vertical plate and a horizontal plate fixed to the top of the vertical plate. The horizontal plate of the first clamping plate extends horizontally toward the second clamping plate, and the horizontal plate of the second clamping plate extends horizontally toward the first clamping plate. The free end of the horizontal plate in the first clamping plate abuts against the free end of the horizontal plate in the second clamping plate.
[0014] As a further limitation of this utility model: the spring is a tension spring.
[0015] As another limitation of this utility model, it also includes a base plate, a first clamping plate fixed on the base plate, and a second clamping plate and a pedal hinged on the base plate.
[0016] As a further limitation of this utility model: a reinforcing rib for supporting the first clamping plate is fixed between the first clamping plate and the base plate, and the reinforcing rib is located on the side of the first clamping plate away from the second clamping plate.
[0017] As a further limitation of this utility model: a limiting member is fixed on the base plate to prevent the pedal from over-reversing.
[0018] By adopting the above technical solution, the beneficial effects achieved by this utility model compared with the prior art are as follows:
[0019] This utility model includes a first clamping plate, a second clamping plate, a spring, a pedal, and a pulling component. The first clamping plate is fixedly installed, while the second clamping plate and the pedal are hinged together. Both the second clamping plate and the pedal swing around their respective hinge axes toward or away from the first clamping plate. The spring is fixedly connected between the first and second clamping plates. In the free state, the clamping surfaces of the first and second clamping plates abut against each other, thus clamping the material. During implementation, when the foot is placed on the pedal and the pedal is depressed, the pedal drives the pulling component, which in turn pulls the second clamping plate, causing its top to rotate away from the first clamping plate. The spring is stretched, allowing material to be placed between the first and second clamping plates. Releasing the pedal causes the spring to rebound and clamp the material. By clamping the material with the first and second clamping plates before sewing, compared to clamping with both legs, manpower is freed, work efficiency is improved, and the stability of the material during fixation is ensured.
[0020] When fine-tuning the material position is required, gently press the pedal to slightly rotate the second clamping plate, adjusting the material's position. After adjustment, lift your foot, and the second clamping plate will return to its original position under spring pressure. At this point, the first and second clamping plates will clamp the adjusted material again. This device ensures flexibility during material fine-tuning and improves sewing accuracy.
[0021] In summary, this invention improves the stability of materials during fixation and the flexibility of leather fine-tuning, ensuring stitching accuracy and enhancing operator comfort and work efficiency. This invention is applicable to the handicraft industry and is used to clamp materials to be sewn. Attached Figure Description
[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0023] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present utility model;
[0024] Figure 2 This is a schematic diagram of the main structure of Embodiment 1 of this utility model;
[0025] Figure 3 for Figure 2 An enlarged schematic diagram of section C;
[0026] Figure 4 This is a top view of Embodiment 1 of the present invention.
[0027] Figure 5 This is a schematic diagram of the main structure of Embodiment 2 of this utility model.
[0028] In the diagram: 1-First clamping plate, 2-Second clamping plate, 3-First hinge shaft, 4-First base, 5-Second base, 6-Second hinge shaft, 7-Spring, 8-First clamping surface, 9-Second clamping surface, 10-Pedal, 11-Pull component, 12-Vertical plate, 13-Arc plate, 14-Horizontal plate, 15-Base plate, 16-Reinforcing rib, 17-Limiting component. Detailed Implementation
[0029] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and do not constitute a limitation thereof.
[0030] The directional terms or positional relationships such as "left," "right," "front," and "back" used in the embodiments are based on the drawings in this utility model specification. Figure 1 The orientation relationships are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component must have a specific orientation, or that it must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the content protected by this utility model.
[0031] Example 1
[0032] like Figures 1-4 As shown, this embodiment includes a first clamping plate 1, a second clamping plate 2, a spring 7, a pedal 10, and a pulling member 11. In its free state, the first clamping surface 8 of the first clamping plate 1 abuts against the second clamping surface 9 of the second clamping plate 2. When material is placed between the first clamping plate 1 and the second clamping plate 2, the material can be clamped, ensuring stability when the material is fixed. During sewing, lightly pressing the pedal 10 slightly separates the first clamping surface 8 of the first clamping plate 1 and the second clamping surface 9 of the second clamping plate 2, facilitating fine-tuning of the material position and providing flexibility for material adjustments.
[0033] Considering the ease of moving this device, such as Figure 1 , 4 As shown, this embodiment also includes a base plate 15, with a first clamping plate 1 fixedly mounted on the base plate 15. The second clamping plate 2 and the pedal 10 are both hinged to the base plate 15. Specifically, the hinged arrangement is as follows: two first bases 4 are fixedly mounted on the base plate 15 at intervals along its front-rear direction. A first hinge shaft 3 extending in the front-rear direction is fixed between the two first bases 4. The bottom of the second clamping plate 2 is rotatably fitted onto the first hinge shaft 3. Similarly, two second bases 5 are also spaced apart along the front-rear direction on the right side of the base plate 15. A second hinge shaft 6 extending in the front-rear direction is fixed between the two second bases 5. The bottom of the pedal 10 is rotatably fitted onto the second hinge shaft 6, and the pedal 10 is tilted upwards to the right. The above-described hinged arrangement is existing technology.
[0034] The rotation axis of pedal 10 is parallel to the rotation axis of the second clamping plate 2, and both pedal 10 and the second clamping plate 2 swing about their respective hinge axes in a direction closer to or farther from the first clamping plate 1, i.e., along... Figure 2 The middle arrow swings left and right.
[0035] Of course, if moving is not a concern, the first clamp 1 can be fixed directly to the ground, and the second clamp 2 and the pedal 10 can be hinged to the ground.
[0036] The first clamping plate 1 and the second clamping plate 2 are symmetrically arranged on the left and right sides. They have the same structure. Taking the first clamping plate 1 as an example: Figure 1 , 2 As shown, the first clamping plate 1 includes a vertical plate 12 and an arc-shaped plate 13 fixed to the top of the vertical plate 12. The arc-shaped plate 13 of the first clamping plate 1 is curved towards the second clamping plate 2, that is, the arc-shaped plate 13 of the first clamping plate 1 is concave towards the second clamping plate 2. Correspondingly, the arc-shaped plate 13 of the second clamping plate 2 is curved towards the first clamping plate 1, and the top end of the arc-shaped plate 13 of the first clamping plate 1 abuts against the top end of the arc-shaped plate 13 of the second clamping plate 2. In this embodiment, on the vertical projection plane, as shown... Figure 2 As shown, the arc plate 13 of the first clamping plate 1 and the arc plate 13 of the second clamping plate 2 are both 1 / 4 arcs, and their tops meet to form a semi-circular shape.
[0037] Spring 7 is fixedly connected between the first clamping plate 1 and the second clamping plate 2. In this embodiment, spring 7 is fixed to the top of the two vertical plates 12. The extension and retraction direction of spring 7 is horizontal, i.e., along the left and right directions. In the free state, the first clamping surface 8 of the first clamping plate 1 abuts against the second clamping surface 9 of the second clamping plate 2. (See figure) Figure 2 , 3 Here, the first clamping surface 8 and the second clamping surface 9 refer to the surfaces that come into contact with the material when it is clamped.
[0038] The pulling element 11 is fixedly connected between the pedal 10 and the second clamping plate 2. In this embodiment, the pulling element 11 is a steel wire rope, and the pulling element 11 is welded and fixed to both the pedal 10 and the second clamping plate 2. Of course, the pulling element 11 can also be any structure in the prior art, such as a pull rope.
[0039] Working principle: When the pedal 10 is pressed down, the pedal 10 rotates around the second hinge axis 6 along... Figure 2 Rotating in the direction of the middle arrow, at this time the pulling member 11 is stretched, and the pulling member 11 pulls the second clamping plate 2 to rotate around the first hinge axis 3, that is, along... Figure 2Rotate in the direction of the middle arrow. After the second clamping plate 2 rotates, a gap is created between the second clamping surface 9 and the first clamping surface 8, which facilitates the insertion of materials. Since the spring 7 is in a stretched state after the second clamping plate 2 rotates around the first hinge axis 3, after the materials are inserted, the foot is lifted, and the second clamping plate 2 is driven to rotate in the opposite direction under the action of the spring 7's rebound force, so that the first clamping plate 1 and the second clamping plate 2 clamp the materials tightly.
[0040] It should be added that, such as Figure 2 As shown, the distance from point A, the connection between the pedal 10 and the pull member 11, to point B, the connection between the second clamping plate 2 and the pull member 11, is adapted to the length of the pull member 11. This adaptation means that the length of the pull member 11 is equal to the distance between points A and B. In this state, the pull member 11 is taut, and when the pedal 10 is pressed down, the pull member 11 can pull the second clamping plate 2 to rotate. Otherwise, if the length of the pull member 11 is too long, even if the pedal 10 is pressed all the way down, the pull member 11 will still be loose and cannot pull the second clamping plate 2 to rotate. Furthermore, because the bottom of the second clamping plate 2 is hinged, considering the effort-saving effect of the pull member 11 when pulling the second clamping plate 2 to rotate, in this embodiment, the connection point B between the second clamping plate 2 and the pull member 11 is located above the middle of the second clamping plate 2, that is, close to the second clamping surface 9 of the second clamping plate 2. Figure 2 As shown, the connection point B is located at the top of the vertical plate 12. Compared to setting the connection point B near the bottom of the vertical plate 12, in this structure, when the pedal 10 is stepped on, the pulling member 11 can easily pull the second clamping plate 2 to rotate.
[0041] In this embodiment, spring 7 is a conventional tension spring, with a spring force greater than or equal to 10N and less than or equal to 30N. A spring force greater than or equal to 10N ensures that when material is placed between the first clamping plate 1 and the second clamping plate 2, spring 7 has sufficient tightening force to clamp the material, ensuring clamping stability. Furthermore, considering the force required to depress the pedal 10, the spring force is set to less than or equal to 30N. At this force, the operator's applied force is within a comfortable range, allowing them to easily depress the pedal 10 and cause the pulling member 11 to rotate the second clamping plate 2. Otherwise, if the spring force is too large, it will be difficult to rotate the second clamping plate 2 via the pulling member 11, requiring the operator to apply greater force to the pedal 10, which would be more strenuous.
[0042] When the foot is lifted, the second clamp 2 rotates to the left under the restoring force of the spring 7. Correspondingly, the pulling member 11 also drives the pedal 10 to rotate to the left. Due to inertia, if the foot leaves the pedal 10, the pedal 10 will reverse to the left and transition to the left side of the second base 5. Therefore, in this embodiment, a limiting member 17 is fixed on the base plate 15, such as... Figure 1 , 4As shown, the limiting member 17 is a straight rod extending in the front-to-back direction, disposed between the two second bases 5, with both ends of the straight rod fixed to the two second bases 5 respectively. Figure 1 In this state, the pedal 10 will stop rotating in the opposite direction when its upper surface abuts against the straight rod. Of course, if the foot is always placed above the pedal 10 during use, it can also prevent the pedal 10 from rotating excessively to the left. The limiter 17 is provided to prevent the pedal 10 from rotating excessively to the left when the foot leaves the pedal 10.
[0043] Because when spring 7 is stretched, it also exerts a tensile force on the first clamping plate 1, in order to ensure the stability of the first clamping plate 1, such as Figure 1 As shown, in this embodiment, a reinforcing rib 16 for supporting the first clamping plate 1 is fixed between the first clamping plate 1 and the base plate 15. The reinforcing rib 16 is located on the side of the first clamping plate 1 away from the second clamping plate 2, that is, on the left side of the first clamping plate 1. The reinforcing rib 16 has a triangular plate structure, with one right-angled side fixed to the first clamping plate 1 and the other right-angled side fixed to the base plate 15.
[0044] When using this embodiment, the foot is placed on the pedal 10 and the pedal 10 is pressed down. The pedal 10 drives the pulling member 11, which pulls the second clamping plate 2, causing the top of the second clamping plate 2 to rotate to the right. At this time, the material can be placed between the first clamping plate 1 and the second clamping plate 2. Because the spring 7 is stretched at this time, the spring 7 rebounds after the pedal 10 is released, thus clamping the material. After the material is clamped by the first clamping plate 1 and the second clamping plate 2, the sewing is completed. Compared with clamping with both legs, this frees up manpower, improves work efficiency, and ensures the stability of the material when it is fixed.
[0045] When fine-tuning of the material position is required, lightly press the pedal 10 to slightly rotate the second clamping plate 2 to adjust the material position. After adjustment, lift your foot, and the second clamping plate 2 will return to its original position under the action of the spring 7. At this time, the first clamping plate 1 and the second clamping plate 2 will clamp the adjusted material again. This device ensures flexibility during material fine-tuning and improves sewing accuracy.
[0046] Example 2
[0047] This embodiment has a structure that is basically the same as that of embodiment 1, except that the structure of the first clamping plate 1 and the second clamping plate 2 is different.
[0048] like Figure 5As shown, the first clamping plate 1 and the second clamping plate 2 are also symmetrically arranged. The first clamping plate 1 includes a vertical plate 12 and a horizontal plate 14 fixed to the top of the vertical plate 12. In this embodiment, the horizontal plate 14 is integrally arranged with the vertical plate 12. The horizontal plate 14 of the first clamping plate 1 extends horizontally toward the second clamping plate 2 (i.e., extends to the left and right), and the horizontal plate 14 of the second clamping plate 2 extends horizontally toward the first clamping plate 1. The free end of the horizontal plate 14 in the first clamping plate 1 abuts against the free end of the horizontal plate 14 in the second clamping plate 2. Here, the free end of the horizontal plate 14 in the first clamping plate 1 refers to the right end of the horizontal plate 14, and the free end of the horizontal plate 14 in the second clamping plate 2 refers to the left end of the horizontal plate 14. The structure other than this is exactly the same as in Embodiment 1, and will not be described in detail in this embodiment.
[0049] The usage process of this embodiment is described in Embodiment 1.
[0050] It should be noted that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A material fixing device for double-needle sewing process, characterized in that, include: The first clamping plate fixed to the ground; A second clamping plate is hinged to the ground, and the second clamping plate swings about its hinge axis toward or away from the first clamping plate. A spring is fixedly connected between the first clamping plate and the second clamping plate. The extension and retraction direction of the spring is horizontal. In the free state of the spring, the clamping surface of the first clamping plate abuts against the clamping surface of the second clamping plate. The pedal is hinged to the ground, and its axis of rotation is parallel to the axis of rotation of the second clamping plate. A pull member is fixedly connected between the pedal and the second clamping plate. The distance from the connection point between the pedal and the pull member to the connection point between the second clamping plate and the pull member is adapted to the length of the pull member. The connection point between the second clamping plate and the pull member is located close to the clamping surface of the second clamping plate.
2. The material fixing device for double-needle sewing process according to claim 1, characterized in that, The first clamping plate and the second clamping plate are symmetrically arranged. The first clamping plate includes a vertical plate and an arc-shaped plate fixed to the top of the vertical plate. The arc-shaped plate of the first clamping plate bends toward the second clamping plate, and the arc-shaped plate of the second clamping plate bends toward the first clamping plate. The top of the arc-shaped plate of the first clamping plate abuts against the top of the arc-shaped plate of the second clamping plate.
3. A material fixing device for double-needle sewing process according to claim 1, characterized in that, The first clamping plate and the second clamping plate are symmetrically arranged. The first clamping plate includes a vertical plate and a horizontal plate fixed to the top of the vertical plate. The horizontal plate of the first clamping plate extends horizontally toward the second clamping plate, and the horizontal plate of the second clamping plate extends horizontally toward the first clamping plate. The free end of the horizontal plate in the first clamping plate abuts against the free end of the horizontal plate in the second clamping plate.
4. A material fixing device for double-needle sewing process according to claim 3, characterized in that, The spring is a tension spring.
5. A material fixing device for double-needle sewing process according to any one of claims 1-4, characterized in that, It also includes a base plate, with the first clamping plate fixed on the base plate, and the second clamping plate and the pedal both hinged to the base plate.
6. A material fixing device for double-needle sewing process according to claim 5, characterized in that, A reinforcing rib for supporting the first clamping plate is fixed between the first clamping plate and the base plate. The reinforcing rib is located on the side of the first clamping plate away from the second clamping plate.
7. A material fixing device for double-needle sewing process according to claim 6, characterized in that, The base plate is fixed with a limiter to prevent the pedal from reversing excessively.