A steering cam structure for a braiding machine and a stop protection device for yarn breakage and yarn shortage.

Abstract

This utility model relates to a steering cam structure for a braiding machine, comprising a circular body with a circular hole in the center and a strip-shaped opening on one side of the hole, connecting the circular hole to the outer circumference of the circular body. Two arc-shaped grooves are symmetrically arranged on the upper end of the circular body. The first arc-shaped groove is located directly above the strip-shaped opening, and the second arc-shaped groove is located at a position 180° rotated relative to the first arc-shaped groove on the upper end of the circular body. These grooves are used to cooperate with a microswitch of the braiding machine to trigger a stop protection action. The advantage is that the inner diameter of the annular protrusion and the circular hole of the circular body are slightly smaller than the outer diameter of the transmission rod. During installation, the expansion of the circular hole achieves a coaxial tight fit, initially preventing detachment. Combined with the locking action of the locking screw and nut, the distance between the strip-shaped openings is reduced, further reinforcing the structure and forming double protection. This effectively avoids the problem of cam detachment caused by loose screws, thus improving the operational stability of the equipment.

Description

Technical Field

[0001] This utility model relates to the technical field of braiding machine accessories, specifically a steering cam structure used in the yarn breakage and yarn shortage stop protection system of a braiding machine. It is used in conjunction with a micro switch to realize stop protection, ensuring stable operation of the braiding machine and the quality of the braided product. Background Technology

[0002] During the operation of a braiding machine, yarn breakage or missing yarn can directly affect the quality of the finished product and even cause damage from idle running. Therefore, a stop protection mechanism is needed, which uses a steering cam in conjunction with a micro switch. Traditional steering cams are made of metal and have only a single through-hole. They are fitted onto the steering shaft through the through-hole and secured by a screw in a thread hole on one side. The cam surface has an arc-shaped groove that engages with the micro switch. When the micro switch roller is within the arc-shaped groove, the stop protection is triggered; when it is on a flat surface, it is not triggered.

[0003] However, traditional steering cams have obvious drawbacks: First, the through hole and steering shaft are clearance fit, and after the screw is tightened, a non-concentric structure is easily formed, resulting in low operating accuracy and affecting the response accuracy of the shutdown protection. Second, the metal material is heavy, which increases the load on the steering shaft and has high manufacturing costs. Third, the fixing screws are prone to loosening and falling off after long-term vibration, causing the steering cam to shift, which prevents the braiding machine from realizing the shutdown protection normally and affects the stability of equipment operation.

[0004] To address the aforementioned issues, this utility model proposes a novel steering cam structure. By optimizing the structural design and material selection, and utilizing coaxial tight fit and dual protection of screws and nuts, the stability of the cam is improved. At the same time, the accuracy is optimized, the cost is reduced, and the reliable operation of the braiding machine's yarn breakage and yarn shortage protection functions is ensured. Utility Model Content

[0005] The purpose of this utility model is to provide a steering cam structure for a braiding machine to solve the problems of low precision, high cost, and easy loosening of traditional steering cams. By using coaxial tight fit and double anti-loosening protection of screws and nuts, the structural stability and operational reliability are improved.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A steering cam structure for a braiding machine includes a circular body with a circular hole in the center and a strip-shaped opening on one side of the circular hole, the strip-shaped opening connecting the circular hole to the outer circumferential surface of the circular body; two arc-shaped grooves are symmetrically provided on the upper end of the circular body, wherein the first arc-shaped groove is located directly above the strip-shaped opening, and the second arc-shaped groove is located at a position 180° rotated relative to the first arc-shaped groove on the upper end of the circular body, for cooperating with a micro switch of the braiding machine to trigger a stop protection action.

[0007] An annular protrusion is integrally formed on the outer side of the lower end of the circular hole of the circular body. The inner hole of the annular protrusion is the same size as the circular hole of the circular body, and both the inner hole of the annular protrusion and the circular hole of the circular body are slightly smaller than the outer diameter of the transmission rod to be installed. During installation, the circular hole can expand under the action of external force, so that the circular body and the transmission rod can be coaxially and tightly fitted, initially preventing the steering cam from falling off the transmission rod. A strip-shaped opening is provided on the annular protrusion, and the strip-shaped opening is aligned vertically with the strip-shaped opening on the circular body, providing structural margin for the expansion of the circular hole.

[0008] A vertical block is provided on each of the two sides below the strip-shaped opening. The inner sides of the two vertical blocks are connected to the outer circumferential surface of the annular protrusion, and a horizontally penetrating connecting hole is opened in the middle of the vertical block. After the locking screw passes through the two connecting holes, it cooperates with the nut to lock. By reducing the spacing of the strip-shaped opening, the connection between the circular body and the transmission rod is further strengthened, forming a double anti-disengagement protection of "coaxial tight fit + screw and nut locking".

[0009] The lower end of the circular main body is also provided with several reinforcing ribs. The upper end of the reinforcing ribs is connected to the lower surface of the circular main body, and the inner side is connected to the outer circumferential surface of the annular protrusion. This is used to enhance the connection strength between the circular main body and the annular protrusion and to avoid structural deformation during long-term use.

[0010] Furthermore, in the two vertical blocks, a circular countersunk hole is provided on the outer side of the connecting hole of one vertical block, and a hexagonal groove is provided on the outer side of the connecting hole of the other vertical block. A hexagonal nut is fitted into the hexagonal groove. The nut of the locking screw is embedded in the circular countersunk hole to avoid running interference caused by the nut protruding. After the threaded end passes through the two connecting holes, it is screwed into the hexagonal nut and tightened. The hexagonal groove can prevent the nut from rotating when the screw is tightened, thereby improving assembly efficiency and fixing stability.

[0011] Furthermore, apart from the locking screws and nuts, the circular main body, annular protrusions, vertical blocks, and reinforcing ribs are integrally injection molded from engineering plastics; preferably, the engineering plastic is PA6GF30, which combines lightweight and structural strength, can reduce the load on the steering shaft, and at the same time reduce material and processing costs, making it suitable for industrial mass production.

[0012] A yarn breakage and yarn shortage protection device for a braiding machine includes the aforementioned steering cam structure, as well as a transmission rod, a shift fork, a hollow shaft, and a micro switch. The hollow shaft is supported and installed between the front panel and the bottom plate of the braiding machine, with its upper and lower ends penetrating the front panel and the bottom plate respectively. The transmission rod is rotatably installed inside the hollow shaft, the shift fork is fixedly installed at the upper end of the transmission rod and is located above the hollow shaft, and the steering cam structure is installed at the lower end of the transmission rod and is located below the hollow shaft. The micro switch is fixedly installed below the bottom plate, and the micro switch roller rolls on the upper surface of the circular main body of the steering cam structure.

[0013] It also includes an elastic bracket, a return spring, and a spring plate. The elastic bracket is installed near the lower end of the hollow shaft. An elastic hook is designed on each side of the elastic bracket. The spring plate is fixed near the lower end of the transmission rod and is located above the steering cam structure. Each side of the elastic bracket is hooked to the elastic hook by one end of a return spring, and the other end of the return spring is hooked to the pre-drilled hole on the spring plate.

[0014] It also includes a positioning ring, which is fixedly installed on the transmission rod near the upper end. The positioning ring is located below the shift fork, and the bottom of the positioning ring slides and presses against the upper end face of the hollow shaft.

[0015] Compared with the prior art, the beneficial effects of this utility model are: Double anti-detachment and strong stability: The inner hole of the annular convex column and the circular hole of the main body are slightly smaller than the outer diameter of the transmission rod. During installation, the expansion of the circular hole achieves coaxial tight fit, initially preventing detachment. In addition, the locking effect of the locking screw and nut reduces the gap of the strip opening for further reinforcement, forming double protection. This effectively avoids the problem of cam falling off due to loosening of traditional screws and improves the stability of equipment operation.

[0016] Improved precision and reliable response: The coaxial tight fit structure avoids the non-concentricity problem caused by traditional clearance fit and screw tightening, ensuring that the steering cam rotates synchronously and accurately with the transmission rod, making the fit between the arc groove and the micro switch more precise, and ensuring timely response of the shutdown protection when the yarn breaks or is missing.

[0017] Lightweight and cost optimization: The integrated injection molding of engineering plastics significantly reduces weight compared to traditional metal materials, thus reducing the load on the steering shaft. At the same time, the integrated injection molding process simplifies the processing flow, lowers material costs, is suitable for mass production, and improves economic efficiency.

[0018] Structural strength assurance: The reinforcing rib at the lower end of the circular main body connects the circular main body and the annular protrusion, which can distribute the force, enhance the connection strength between the two, and prevent the annular protrusion from deforming due to vibration or load during long-term use, thus extending the service life of the steering cam. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model. Figure 1 .

[0020] Figure 2 This is a schematic diagram of the overall structure of an embodiment of the present utility model. Figure 2 .

[0021] In the diagram: 1. Circular main body; 2. Circular hole; 3. Strip opening; 4. Arc-shaped groove; 5. Annular protrusion; 6. Vertical block; 7. Connecting hole; 8. Circular countersunk hole; 9. Hexagonal groove; 10. Reinforcing rib plate.

[0022] Figure 3 This is a partial schematic diagram showing the application of this utility model in the protection against yarn breakage and yarn shortage in a braiding machine. Figure 4 for Figure 3 Diagram of an explosion.

[0023] In the diagram: 11. Drive rod; 12. Shift fork; 13. Panel; 14. Base plate; 15. Micro switch; 16. Micro switch roller; 17. Elastic bracket; 18. Return spring; 19. Spring mounting plate; 20. Positioning ring; 21. Hollow shaft. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-4 This utility model provides a technical solution: A steering cam structure for a braiding machine includes a circular body 1, a circular hole 2 in the middle of the circular body 1, and a strip-shaped opening 3 on one side of the circular hole 2, which connects the circular hole 2 to the outer circumferential surface of the circular body 1; two arc-shaped grooves 4 are symmetrically provided on the upper end of the circular body 1, wherein the first arc-shaped groove 4 is located directly above the strip-shaped opening 3, and the second arc-shaped groove 4 is located at the upper end of the circular body 1 at a position rotated 180° relative to the first arc-shaped groove 4, which is used to cooperate with the micro switch 15 of the braiding machine to trigger a stop protection.

[0026] An annular protrusion 5 is integrally formed on the outer side of the lower end of the circular hole 2 of the circular body 1. The inner hole of the annular protrusion 5 is the same size as the circular hole 2 of the circular body 1, and both are slightly smaller than the outer diameter of the transmission rod 11 to be installed. During installation, external force pushes the circular body 1 to expand the circular hole 2 until the circular body 1 and the transmission rod 11 are completely fitted together to achieve coaxial tight fit and initially prevent the steering cam from falling off. The annular protrusion 5 has a strip-shaped opening 3 that is aligned vertically with the circular body 1 to provide structural margin for the expansion of the circular hole 2 and avoid material breakage.

[0027] A vertical block 6 is provided on each of the two sides below the strip-shaped opening 3. The inner sides of the two vertical blocks 6 are connected to the outer circumferential surface of the annular protrusion 5. A horizontally penetrating connecting hole 7 is provided in the middle of the vertical block 6. In the two vertical blocks 6, a circular countersunk hole 8 is provided on the outside of the connecting hole 7 of one vertical block 6, and a hexagonal groove 9 is provided on the outside of the connecting hole 7 of the other vertical block 6. A hexagonal nut is installed in the hexagonal groove 9. The nut of the locking screw is embedded in the circular countersunk hole 8. The threaded end passes through the two connecting holes 7 and is screwed into the hexagonal nut and tightened. By reducing the spacing of the strip-shaped opening 3, the connection between the circular body 1 and the transmission rod 11 is further strengthened, forming a double anti-detachment protection.

[0028] The lower end of the circular main body 1 is also provided with several reinforcing ribs 10. The upper end of the reinforcing ribs 10 is connected to the lower surface of the circular main body 1, and the inner side is connected to the outer circumferential surface of the annular protrusion 5 to enhance the overall strength of the structure. Except for the locking screws and hexagonal nuts, the other components of this structure are integrally injection molded using engineering plastic PA6GF30, which combines lightweight and structural strength and is suitable for mass production.

[0029] like Figure 3-4 A yarn breakage and yarn shortage protection device for a braiding machine includes the aforementioned steering cam structure, a transmission rod, a shift fork, a hollow shaft, and a micro switch. The hollow shaft is supported and installed between the front panel and the back plate of the braiding machine, with its upper and lower ends penetrating the front panel and the back plate respectively. The transmission rod is rotatably installed inside the hollow shaft. The shift fork is fixedly installed at the upper end of the transmission rod and is located above the hollow shaft. The steering cam structure is installed at the lower end of the transmission rod and is located below the hollow shaft. The micro switch is fixedly installed below the back plate, with its micro switch roller rolling on the upper surface of the circular body of the steering cam structure. The micro switch is fixed to the back plate by an inverted L-shaped bracket, or it can be fixed to the outer side of the lower end of the hollow shaft to ensure that the micro switch remains stationary.

[0030] It also includes an elastic bracket, a return spring, and a spring plate. The elastic bracket is installed near the lower end of the hollow shaft, and an elastic hook is designed on each side of the underside of the elastic bracket. The spring plate is fixed near the lower end of the transmission rod and is located above the steering cam structure. Each side of the elastic bracket is hooked to an elastic hook at one end by a return spring, and the other end of the return spring is hooked to a pre-drilled hole on the spring plate. This design allows the steering cam mechanism to automatically reset under the action of the return spring.

[0031] It also includes a positioning ring, which is fixedly installed on the transmission rod near the upper end. The positioning ring is located below the shift fork, and its lower part slides against the upper end face of the hollow shaft. The positioning ring 20 is designed to adjust the installation height of the transmission rod to meet usage requirements.

[0032] In this embodiment, the circular body 1 is fitted onto the transmission rod 11 of the braiding machine through the circular hole 2. The circular hole 2 expands because it is slightly smaller than the outer diameter of the transmission rod 11, achieving a coaxial tight fit with the transmission rod 11. Then, the locking screw is tightened to reduce the spacing of the strip openings 3, further reinforcing the connection. When the braiding machine is ready to run, the manual rotation of the adjustment cam rotates synchronously with the transmission rod 11. The microswitch roller 16 of the microswitch 15 is located on the plane of the circular body 1. When the yarn is being fed normally, the machine will not be stopped. When the yarn breaks or is missing, the shift fork 12 is moved, overcoming the tension of the return spring, and at the same time, it rotates the transmission rod 11, thereby rotating the adjustment cam by a certain angle, so that the microswitch roller 16 enters the arc-shaped groove 4, triggering the stop protection. The double anti-detachment structure ensures that the adjustment cam will not loosen or shift, the engineering plastic material reduces the load on the transmission rod, and the reinforcing rib 10 ensures the durability of the structure. Overall, the machine achieves a high-precision and high-stability stop protection function.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steering cam structure for a braiding machine, characterized in that, The steering cam structure includes a circular body with a circular hole in the center and a strip-shaped opening on one side of the circular hole, which connects the circular hole to the outer circumferential surface of the circular body. The upper end of the circular body has two arc-shaped grooves. The first arc-shaped groove is located directly above the strip-shaped opening, and the second arc-shaped groove is located at the upper end of the circular body at a position rotated 180° relative to the first arc-shaped groove. The circular body has an annular protrusion on the outer side of the lower end of the circular hole. The inner hole of the annular protrusion is the same size as the circular hole of the circular body, and both the inner hole of the annular protrusion and the circular hole of the circular body are slightly smaller than the outer diameter of the transmission rod to be installed. During installation, the circular hole can expand to make the circular body and the transmission rod coaxially and tightly fit together to prevent detachment. The annular protrusion has a strip-shaped opening, and the strip-shaped opening is aligned vertically with the strip-shaped opening on the circular body. There is a vertical block on each side below the strip-shaped opening. The inner sides of the two vertical blocks are connected to the outer circumferential surface of the annular protrusion. A horizontally penetrating connecting hole is opened in the middle of the vertical block. The locking screw passes through the two connecting holes and locks with the nut to form double anti-detachment protection.

2. The steering cam structure of the braiding machine according to claim 1, characterized in that, Of the two vertical blocks, one vertical block has a circular countersunk hole on the outside of the connecting hole, and the other vertical block has a hexagonal groove on the outside of the connecting hole. A hexagonal nut is fitted into the hexagonal groove, and the nut of the locking screw is embedded in the circular countersunk hole. The threaded end passes through the two connecting holes and is screwed into the hexagonal nut.

3. The steering cam structure of the braiding machine according to claim 1, characterized in that, Except for the locking screws and nuts, the circular main body, annular protrusions, vertical blocks, and reinforcing ribs are integrally injection molded from engineering plastics.

4. The steering cam structure of the braiding machine according to claim 1, characterized in that, The lower end of the circular main body is also provided with several reinforcing ribs. The upper end of the reinforcing ribs is connected to the lower surface of the circular main body, and the inner side is connected to the outer circumferential surface of the annular convex column.

5. A yarn breakage and yarn shortage protection device for a braiding machine, characterized in that, The steering cam structure, including any one of claims 1-4, further includes a transmission rod, a shift fork, a hollow shaft, and a micro switch. The hollow shaft is supported and installed between the panel and the base plate of the braiding machine, with its upper and lower ends penetrating the panel and the base plate respectively. The transmission rod is rotatably installed inside the hollow shaft. The shift fork is fixedly installed at the upper end of the transmission rod and is located above the hollow shaft. The steering cam structure is installed at the lower end of the transmission rod and is located below the hollow shaft. The micro switch is fixedly installed below the base plate, and the micro switch roller rolls on the upper surface of the circular body of the steering cam structure.

6. The braiding machine yarn breakage and yarn shortage protection device according to claim 5, characterized in that, It also includes an elastic bracket, a return spring, and a spring plate. The elastic bracket is installed near the lower end of the hollow shaft. An elastic hook is designed on each side of the elastic bracket. The spring plate is fixed near the lower end of the transmission rod and is located above the steering cam structure. Each side of the elastic bracket is hooked to the elastic hook by one end of a return spring, and the other end of the return spring is hooked to the pre-drilled hole on the spring plate.

7. The braiding machine yarn breakage and yarn shortage protection device according to claim 5, characterized in that, It also includes a positioning ring, which is fixedly installed on the transmission rod near the upper end. The positioning ring is located below the shift fork, and the bottom of the positioning ring slides and presses against the upper end face of the hollow shaft.

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