Negative pressure positioning punch and full-automatic button sewing machine thereof

Abstract

This utility model relates to the field of button attaching machine technology, and in particular to a negative pressure positioning punch and its fully automatic button attaching machine. It includes a punch body with a negative pressure channel extending axially and forming an L-shape inside. A punch end cap is detachably installed at the lower end of the punch body, and an adsorption hole communicating with the negative pressure channel is opened at the center of its bottom. It also includes steel balls and an elastic limiting ring. The steel balls are disposed inside the punch end cap and arranged around the adsorption hole, while the elastic limiting ring is disposed inside the punch end cap and above the steel balls. This utility model features a flexible leveling mechanism composed of steel balls and an elastic limiting ring. When the button descends and contacts clothing or a mold on one side, the button on the contact side applies radial pressure to the steel ball on the same side, forcing the steel ball to squeeze the elastic limiting ring and produce a slight radial elastic yield. This eliminates problems such as button "flying off," displacement, or misaligned button pins caused by parallelism errors, ensuring the firmness and aesthetics of the button attaching operation.

Description

Technical Field

[0001] This utility model relates to the field of button attaching machine technology, and in particular to a negative pressure positioning punch and its fully automatic button attaching machine. Background Technology

[0002] In the garment and bag manufacturing industries, automatic button attaching machines are core equipment for achieving efficient and standardized assembly of buttons, rivets, and other parts. Their workflow typically includes steps such as button picking, positioning, and stamping / riveting. Currently, mainstream automatic button attaching machines generally use negative pressure suction punches to pick up and position buttons. The basic working principle of this type of punch is: using vacuum negative pressure to suction the button through the suction hole at the end of the punch, and then the drive mechanism (such as a cylinder) drives the punch and the button to move down together, placing the button on a preset mold and stamping it so that the button's pins penetrate the garment and are riveted.

[0003] However, existing negative pressure positioning punches have a significant technical drawback in practical applications: they cannot effectively compensate for the parallelism error between the button and the mold or clothing surface. Ideally, after the button is attracted, its bottom surface should be absolutely parallel to the lower surface of the punch end cap. However, in actual production, due to slight deformation or manufacturing tolerances of the button itself, as well as installation deviations or wear of the punch system after long-term use, the bottom surface of the button may not be parallel to the surface of the clothing or mold below during its descent. Often, only one side makes contact first. This one-sided contact immediately triggers a series of problems. First, because the button is blocked on one side, the negative pressure suction force still pulls it tightly towards the punch end cap, causing the button to be subjected to a tilting torque. This makes it very easy for the button to "fly off" or shift from the punch end cap, resulting in positioning failure, or even damage to the button or jamming of the equipment. Second, even if the button is not blown off, forcibly punching it in this tilted state will prevent the button's pins from penetrating the fabric vertically, resulting in loose riveting and crooked pins, which seriously affects product quality. In addition, this uneven force will also generate additional radial impact on the punch body, mold and drive mechanism, accelerating the wear of key components of the equipment and reducing the overall service life.

[0004] Therefore, given that existing negative pressure positioning punches cannot compensate for parallelism errors between buttons and clothing, leading to buttons easily flying off and misaligned riveting, which seriously affects the positioning success rate and product quality, and that uneven force exacerbates equipment wear, a negative pressure positioning punch and its fully automatic button-attaching machine can be designed. This punch can automatically adapt to and compensate for minute non-parallelism the moment the button contacts the clothing, ensuring that the button completes the positioning and riveting process smoothly and accurately, thereby fundamentally improving the success rate of button-attaching operations and product quality. Utility Model Content

[0005] In order to overcome the problem that the existing negative pressure positioning punch cannot compensate for the parallelism error between the button and the clothing, which causes the button to easily break off and the riveting to be crooked, seriously affecting the positioning success rate and product quality, and at the same time, the uneven force aggravates the wear and tear of the equipment.

[0006] The technical solution of this utility model is as follows: a negative pressure positioning punch, including a punch body, a negative pressure channel extending along its axial direction and turning in an L-shape inside the punch body, a punch end cap detachably installed at the lower end of the punch body, an adsorption hole communicating with the negative pressure channel is opened at the center of its bottom, and also includes a steel ball and an elastic limiting ring, the steel ball is set inside the punch end cap and arranged around the adsorption hole, and the elastic limiting ring is set inside the punch end cap and located above the steel ball.

[0007] Preferably, the suction hole, through a negative pressure generating device, firmly adsorbs the button onto the bottom of the punch end cap. The punch body carries the button downwards. When the bottom surface of the button is about to contact the clothing, it may make contact on one side due to non-parallelism. At this time, the button on the contact side is blocked, and pressure is applied to the steel ball on the same side. The steel ball squeezes the elastic limiting ring, deforms it, and produces a slight radial concession, allowing the button to deflect slightly. The punch body presses down, riveting the button's pin onto the clothing, completing the buttoning operation.

[0008] Preferably, the upper port of the negative pressure channel is used to connect to an external negative pressure generating device.

[0009] Preferably, the inner wall of the punch end cap is provided with an annular limiting groove, and the elastic limiting ring is nested and fixed in the annular limiting groove.

[0010] Preferably, the lower end of the punch body is provided with a connecting seat, the outer surface of the connecting seat is provided with external threads, and the inner wall of the punch end cap is provided with corresponding internal threads, and the two are connected by threads.

[0011] Preferably, the upper end of the punch end cap is provided with an L-shaped groove that extends to the outer wall of the punch end cap, and the lower end of the punch body is provided with a corresponding buckle. The number of buckles and grooves is not less than two sets.

[0012] Preferably, a limiting mechanism is also included, which includes a fixed ring and a limiting sleeve. The fixed ring is fixedly connected to the outer surface of the punch body. The limiting sleeve has several sets of annularly distributed guide holes. A guide rod is movably inserted into the guide hole. The top end of the guide rod is fixedly connected to the lower end face of the fixed ring. A spring is fixedly connected between the fixed ring and the limiting sleeve. The spring is sleeved on the outside of the guide rod.

[0013] The fully automatic button-attaching machine includes a negative pressure positioning punch as described above, as well as a worktable, a button-attaching mold, and a stamping cylinder. The button-attaching mold is set on the worktable and aligned vertically with the punch body. The retractable end of the lower side of the stamping cylinder is connected to the punch body, and the stamping and attaching action is performed by lifting and lowering.

[0014] The beneficial effects of this invention are as follows: Buttons are picked up using negative pressure adsorption, resulting in uniform adsorption force. This is particularly suitable for buttons with irregular or thin surfaces, avoiding damage or positioning deviations that may be caused by mechanical clamping. A flexible leveling mechanism consisting of steel balls and elastic limiting rings is installed inside the punch end cap. When the button descends and contacts the clothing or mold on one side, the button on the contact side applies radial pressure to the steel ball on the same side, forcing the steel ball to squeeze the elastic limiting ring and produce a slight radial elastic yield. This process allows the adsorbed button to deflect slightly, enabling its bottom surface to adaptively and completely conform to the mold surface. This completely eliminates problems such as button "flying off," displacement, or misaligned rivet feet caused by parallelism errors. This not only significantly reduces the defect rate in the production process but also fundamentally ensures the firmness and aesthetics of the button-attaching operation. Attached Figure Description

[0015] Figure 1 The diagram shown is a three-dimensional structural schematic of Embodiment 1 of the fully automatic button-attaching machine of this utility model; Figure 2 The diagram shown is a three-dimensional structural schematic of Embodiment 1 of the negative pressure positioning punch of this utility model; Figure 3 The diagram shown is a three-dimensional cross-sectional view of Embodiment 1 of the negative pressure positioning punch of this utility model. Figure 4 The diagram shown is a three-dimensional disassembled structural schematic of Embodiment 1 of the negative pressure positioning punch of this utility model; Figure 5 The diagram shown is a three-dimensional structural schematic of Embodiment 2 of the negative pressure positioning punch of this utility model; Figure 6 The diagram shown is a three-dimensional structural schematic of Embodiment 3 of the fully automatic button-attaching machine of this utility model; Figure 7 The diagram shown is a three-dimensional structural schematic of embodiment 3 of the negative pressure positioning punch of this utility model; Figure 8 The diagram shown is a three-dimensional structural schematic of the limiting mechanism in the negative pressure positioning punch of this utility model.

[0016] Explanation of reference numerals in the attached drawings: 1. Punch body; 2. Punch end cap; 3. Steel ball; 4. Elastic limiting ring; 5. Annular limiting groove; 6. Worktable; 7. Stapling mold; 8. Negative pressure channel; 9. Adsorption hole; 10. Connecting seat; 111. Fixing ring; 112. Limiting sleeve; 113. Guide insertion hole; 114. Guide rod; 115. Spring; 12. Slot; 13. Buckle; 14. Stamping cylinder. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Example 1 Please see Figures 1-4 This utility model provides an embodiment: a negative pressure positioning punch, including a punch body 1, a negative pressure channel 8 extending along its axial direction and turning in an L-shape inside the punch body 1, a punch end cap 2 detachably installed at the lower end of the punch body 1, an adsorption hole 9 communicating with the negative pressure channel 8 at the center of its bottom, and also including a steel ball 3 and an elastic limiting ring 4. The steel ball 3 is disposed inside the punch end cap 2 and arranged around the adsorption hole 9, and the elastic limiting ring 4 is disposed inside the punch end cap 2 and located above the steel ball 3.

[0019] The upper port of the negative pressure channel 8 is used to connect to an external negative pressure generating device. The inner wall of the punch end cover 2 is provided with an annular limiting groove 5. The elastic limiting ring 4 is nested and fixed in the annular limiting groove 5. The lower end of the punch body 1 is provided with a connecting seat 10. The outer surface of the connecting seat 10 is provided with an external thread. The inner wall of the punch end cover 2 is provided with a corresponding internal thread. The two are connected by threads.

[0020] The fully automatic button-attaching machine includes a negative pressure positioning punch as described above, a worktable 6, a button-attaching mold 7, and a stamping cylinder 14. The button-attaching mold 7 is set on the worktable 6 and aligned vertically with the punch body 1. The lower telescopic end of the stamping cylinder 14 is connected to the punch body 1 and performs the stamping and buttoning action by lifting and lowering.

[0021] During operation, the elastic limiting ring 4 is used to constrain the steel ball 3 in the axial and radial directions, but allows the steel ball 3 to generate radial displacement when under force. The suction hole 9, through the negative pressure generating device, firmly attaches the button to the bottom of the punch end cap 2. The punch body 1 carries the button down. When the bottom surface of the button is about to contact the clothing or the buttoning mold 7, it may make contact on one side due to non-parallelism. At this time, the button on the contact side is blocked, and pressure is applied to the steel ball 3 on the same side. The steel ball 3 squeezes the elastic limiting ring 4 to deform it and generate a small radial concession, allowing the button to deflect slightly until its bottom surface is completely attached to the surface of the buttoning mold 7. During this process, the negative pressure is maintained. When the negative pressure is released, the punch body 1 rises slightly. Then, the stamping mechanism is activated, and the punch body 1 presses down to rivet the button's pin onto the clothing, completing the buttoning operation.

[0022] Example 2 Please see Figure 5 The difference from Embodiment 1 is that the upper end of the punch end cap 2 is provided with an L-shaped groove 12, which extends to the outer wall of the punch end cap 2. The lower end of the punch body 1 is provided with a buckle 13 that cooperates with it. The number of buckles 13 and grooves 12 is not less than 2 sets.

[0023] By having the slot 12 on the punch end cover 2 cooperate with the buckle 13 at the lower end of the punch body 1 to form no less than two sets of connection structures, this design realizes the quick positioning and reliable connection between the punch body 1 and the punch end cover 2, effectively transmits torque and prevents loosening. Its structure is compact, easy to install and disassemble, and significantly improves the repeatability and replacement efficiency of the punch.

[0024] Example 3 Please see Figures 6-8 The difference from Embodiment 1 is that it also includes a limiting mechanism, which includes a fixing ring 111 and a limiting sleeve 112. The fixing ring 111 is fixedly connected to the outer surface of the punch body 1. The limiting sleeve 112 has several sets of annularly distributed guide holes 113. A guide rod 114 is movably inserted into the guide hole 113. The top end of the guide rod 114 is fixedly connected to the lower end face of the fixing ring 111. A spring 115 is fixedly connected between the fixing ring 111 and the limiting sleeve 112. The spring 115 is sleeved on the outside of the guide rod 114.

[0025] During operation, the button is placed inside the limiting sleeve 112. When the punch body 1 is pressed downward, the fixing ring 111 moves with it. Through the guide rod 114, it pushes the limiting sleeve 112 to move downward against the elastic force of the spring 115, realizing flexible buffering and limiting of the stroke. When the external force is removed, the spring 115 pushes the limiting sleeve 112 to reset and drives the punch body 1 to return to its original position quickly. The cooperation between the guide rod 114 and the guide hole 113 ensures the stability and accuracy of the movement process, prevents off-center loading and jamming, and effectively improves the stability and positioning accuracy of the stamping operation.

[0026] Through the above steps, buttons are picked up using negative pressure adsorption, resulting in uniform adsorption force. This method is particularly suitable for buttons with irregular or thin surfaces, avoiding damage or positioning deviations that may be caused by mechanical clamping. A flexible leveling mechanism consisting of steel balls 3 and elastic limiting rings 4 is installed inside the punch end cap 2. When the button descends and contacts clothing or one side of the mold, the button on the contact side applies radial pressure to the steel ball 3 on the same side, forcing the steel ball 3 to squeeze the elastic limiting ring 4 and produce a slight radial elastic yield. This process allows the adsorbed button to... A slight deflection allows the bottom surface to adaptively and completely conform to the mold surface, completely eliminating problems such as buttons "flying off," shifting, or misaligned rivet feet caused by parallelism errors. This not only significantly reduces the defect rate in the production process but also fundamentally ensures the firmness and aesthetics of the button-attaching operation. This solves the problem that existing negative pressure positioning punches cannot compensate for the parallelism error between buttons and clothing, causing buttons to easily fly off and rivet to become misaligned, which seriously affects the positioning success rate and product quality. At the same time, uneven force exacerbates equipment wear.

[0027] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A negative pressure positioning punch, comprising a punch body (1), wherein the punch body (1) has a negative pressure channel (8) extending axially and turning in an L-shape inside, and a punch end cap (2) is detachably installed at the lower end of the punch body (1), wherein an adsorption hole (9) communicating with the negative pressure channel (8) is provided at the center of its bottom, characterized in that: It also includes a steel ball (3) and an elastic limiting ring (4). The steel ball (3) is located inside the punch end cap (2) and arranged around the adsorption hole (9). The elastic limiting ring (4) is located inside the punch end cap (2) and above the steel ball (3).

2. The negative pressure positioning punch according to claim 1, characterized in that: The upper port of the negative pressure channel (8) is used to connect an external negative pressure generating device.

3. The negative pressure positioning punch according to claim 1, characterized in that: The inner wall of the punch end cap (2) is provided with an annular limiting groove (5), and the elastic limiting ring (4) is nested and fixed in the annular limiting groove (5).

4. A negative pressure positioning punch according to claim 1, characterized in that: The lower end of the punch body (1) is provided with a connecting seat (10), the outer surface of the connecting seat (10) is provided with an external thread, and the inner wall of the punch end cap (2) is provided with a corresponding internal thread. The two are connected by threads.

5. A negative pressure positioning punch according to claim 1, characterized in that: The upper end of the punch end cap (2) is provided with an L-shaped groove (12), which extends to the outer wall of the punch end cap (2). The lower end of the punch body (1) is provided with a buckle (13) that cooperates with it. The number of buckles (13) and grooves (12) is not less than 2 sets.

6. A negative pressure positioning punch according to claim 1, characterized in that: It also includes a limiting mechanism, which includes a fixed ring (111) and a limiting sleeve (112). The fixed ring (111) is fixedly connected to the outer surface of the punch body (1). The limiting sleeve (112) has several sets of annularly distributed guide holes (113). A guide rod (114) is movably inserted into the guide hole (113). The top end of the guide rod (114) is fixedly connected to the lower end face of the fixed ring (111). A spring (115) is fixedly connected between the fixed ring (111) and the limiting sleeve (112). The spring (115) is sleeved on the outside of the guide rod (114).

7. A fully automatic button-attaching machine, characterized in that... The negative pressure positioning punch according to claim 1 also includes a worktable (6), a snap-fit ​​mold (7) and a stamping cylinder (14). The snap-fit ​​mold (7) is set on the worktable (6) and aligned vertically with the punch body (1). The retractable end of the stamping cylinder (14) is connected to the punch body (1) and performs the stamping snap-fit ​​action by lifting and lowering.

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