Cam thread trimming device driven by belt pulley

Abstract

The utility model discloses a cam trimming device driven by a belt pulley, which is used for cutting a wire on a coil and comprises a base and a support plate, the support plate is fixed on the base, and a wire loading component, a transmission component, a driving component and a cutting component are arranged on the support plate; the coil is installed on the wire loading assembly, the wire loading assembly and the driving assembly are arranged side by side, the transmission assembly is located above the driving assembly, and the cutting assembly is arranged on one side of the driving assembly. The driving assembly drives the transmission assembly to rotate when moving, the transmission assembly drives a wire on a coil to move for feeding, and the driving assembly controls the cutting assembly to intermittently cut the wire. And other external equipment is not needed, the equipment cost is reduced, intermittent cutting enables the moving distance of the wire to be more accurate, start-stop control is quicker, and the cutting accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of machinery, in particular to a cam thread trimming device driven by a pulley. Background Art

[0002] In the optical communication industry, wire cutting is an essential task for some precision equipment that requires wires to perform work. The use of this type of wire often has the characteristics of small wire diameter, high wire cutting accuracy, and high length consistency requirements. Figure 1 The full coil of optical communication wire shown on the left needs to be cut into the lengths shown on the right. Therefore, although there are integrated cutting and stripping machines on the market, these are primarily used for cutting and stripping ordinary circuit wires. They are pneumatically driven (compressed air enters the cylinder, pushing the piston, which drives the blades to cut). The accuracy of the wire cutting is related to the pressure and flow of the compressed air. This requires an air source to provide the compressed air and a control system to control the cylinder's operating state. This requires a high degree of reliance on external equipment, increasing costs and requiring high maintenance. Furthermore, the displacement accuracy of pneumatics cannot meet the precision cutting requirements of optical communication wires.

[0003] Therefore existing technology still needs to be improved and improved. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a cam wire cutting device driven by a pulley to solve the problem that the existing pneumatic method of driving wire cutting relies on external equipment, resulting in increased costs.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A pulley-driven cam wire trimmer is used to cut wire on a coil. The device comprises a base and a support plate, the support plate being fixed to the base and provided with a wire loading assembly, a transmission assembly, a drive assembly, and a cutting assembly. The coil is mounted on the wire loading assembly, the wire loading assembly and the drive assembly being arranged side by side, the transmission assembly being located above the drive assembly, and the cutting assembly being located on one side of the drive assembly.

[0007] When the driving assembly moves, it drives the transmission assembly to rotate, the transmission assembly drives the wire material on the coil to move for feeding, and the driving assembly controls the cutting assembly to intermittently cut the wire material.

[0008] In the pulley-driven cam thread trimming device, the thread loading assembly includes a first bearing and a coil support shaft, and a first mounting hole is provided at one end of the support plate; the first bearing is inserted into one end of the coil support shaft and then into the through hole in the middle of the coil, and the other end of the coil support shaft is inserted into the first mounting hole.

[0009] In the pulley-driven cam thread trimming device, the transmission assembly includes several guide wheels, several guide wheel support shafts and several second bearings; the middle end of the support plate is provided with second mounting holes with the same number as the guide wheels; each guide wheel support shaft is inserted into the corresponding second bearing, and the second bearing is embedded in the corresponding second mounting hole, one end of each guide wheel support shaft passes through the through hole in the middle of the corresponding guide wheel and extends out, and the other end of the guide wheel support shaft is inserted into the second mounting hole.

[0010] In the pulley-driven cam thread trimming device, the coil support shaft and the first bearing are interference fit, and the guide wheel support shaft and the second bearing are interference fit.

[0011] In the pulley-driven cam thread trimming device, the driving assembly includes a driven wheel support shaft, a driving wheel support shaft, a third bearing, a fourth bearing, a driving wheel, a driven wheel and a transmission pulley; a third mounting hole and a fourth mounting hole are provided on the support plate, a cam is provided on the driving wheel, and a handle is provided on the cam;

[0012] One end of the driven wheel support shaft passes through the third bearing and the driven wheel in sequence and extends out from the center hole of the driven wheel; the other end of the driven wheel support shaft is inserted into the third mounting hole; one end of the driving wheel support shaft passes through the fourth bearing and the driving wheel in sequence and extends out from the through hole on the cam; the other end of the driving wheel support shaft is inserted into the fourth mounting hole, and the transmission pulley is sleeved on the driving wheel and the driven wheel.

[0013] In the pulley-driven cam thread trimming device, the outer ring of the driven wheel and the inner ring of the transmission pulley are full transmission teeth; and the preset arc segment on the outer ring of the driving wheel is provided with transmission teeth.

[0014] In the pulley-driven cam thread trimming device, the cam and the driving wheel are integrally formed, and the convex point on the cam is arranged between the handle and the edge of the driving wheel, and the convex point is located on the opposite side of the driving teeth on the driving wheel.

[0015] In the pulley-driven cam thread trimming device, the cutting assembly includes a cutting blade, a tool holder, a material holder, a slider holder, a slider, and a wire spring;

[0016] The slider bracket is fixed on the support plate; the lower end of the tool bracket passes through the side groove of the slider bracket and is inserted into the inner hole of the slider bracket, and the sliding rod of the slider bracket moves up and down in the side groove; the slider is fixed on the sliding rod of the slider bracket, and the wire spring is arranged in the inner hole of the slider bracket. The top of the wire spring is in elastic contact with the lower end of the tool bracket, and the cutting blade is fixed in the knife groove at the top of the tool bracket. The material bracket is arranged above the slider bracket and fixed on the support plate.

[0017] In the pulley-driven cam thread trimming device, a through hole is provided on one side of the slider, the slider is placed in the side groove of the slider bracket, and the lower end of the tool bracket passes through the through hole on the upper groove edge of the side groove, the through hole on the slider, and the through hole on the lower groove edge of the side groove in sequence, and is inserted into the inner hole of the slider bracket; the slider is screwed and fixed to the sliding rod of the tool bracket.

[0018] In the pulley-driven cam wire cutting device, one end of the material bracket is provided with a threading hole, and the wire material enters the threading hole after being moved out by the driving wheel. The other end of the material bracket is provided with a sinking surface, and a blanking chute is provided on the sinking surface.

[0019] Compared to the prior art, the present invention provides a pulley-driven cam wire trimming device for cutting wire on a coil, comprising a base and a support plate, the support plate being fixed to the base, the support plate being provided with a wire loading assembly, a transmission assembly, a drive assembly, and a cutting assembly; the coil being mounted on the wire loading assembly, the wire loading assembly and the drive assembly being arranged side by side, the transmission assembly being located above the drive assembly, and the cutting assembly being arranged on one side of the drive assembly; the drive assembly driving the transmission assembly to rotate when in motion, the transmission assembly driving the wire on the coil to move for feeding, and the drive assembly controlling the cutting assembly to intermittently cut the wire. There is no need to rely on other external equipment, thus reducing equipment costs, and intermittent cutting makes the wire's movement distance more precise and the start-stop control more rapid, thereby improving cutting accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of existing coils and wires.

[0021] Figure 2 This is an exploded view of the structure of the pulley-driven cam thread trimming device provided by the utility model.

[0022] Figure 3 This is a structural assembly diagram of the pulley-driven cam thread trimming device provided by the utility model.

[0023] Figure 4 These are four views of the pulley-driven cam thread trimmer device provided by the utility model.

[0024] Figure 5This is a schematic diagram of the intermittent cutting of the pulley-driven cam thread trimmer provided by the utility model.

[0025] Figure 6 This is a schematic diagram of the wire cutting length provided by the present invention. DETAILED DESCRIPTION

[0026] This utility model provides a pulley-driven cam thread trimmer. To clarify the purpose, technical solution, and effects of this utility model, the following describes this utility model in further detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are intended only to illustrate this utility model and are not intended to limit it.

[0027] Please also see Figures 2 to 4 The present invention provides a pulley-driven cam wire trimming device for cutting optical communication wire wrapped around a coil 100. The pulley-driven cam wire trimming device includes a base 1 and a support plate 2. The support plate 2 is fixed to the base 1. The support plate 2 is provided with a wire loading assembly, a transmission assembly, a drive assembly, and a cutting assembly. The coil 100 is mounted on the wire loading assembly. The wire loading assembly and the drive assembly are arranged side by side, with the transmission assembly located above the drive assembly and the cutting assembly located on one side of the drive assembly. When the drive assembly moves, the friction force drives the transmission assembly to rotate. The transmission assembly drives the wire on the coil 100 to move for feeding. The drive assembly controls the cutting assembly to intermittently cut the wire.

[0028] The intermittent cutting is that when the driving component rotates to the starting point, it drives the transmission component to feed (i.e., controls the movement of the wire), and continues to rotate to the stop point, it will stop driving the transmission component to rotate. Even if the driving component continues to rotate, it will not continue to feed. Continuing to rotate will control the cutting component to perform a cutting operation. Continue to rotate and continue to feed when it reaches the starting point again. After reaching the stop point, it stops feeding and continues to rotate to cut; repeat the operation. The pulley-driven cam wire cutting device uses the transmission pulley in the transmission component to complete the feeding action of the wire 200, and then relies on the specific action of the cam in the driving component to realize the mechanical action of the cutting component, thereby realizing the cutting action of the wire. There is no need to rely on other external equipment, which reduces equipment costs, and the moving distance of the wire is more accurate and the start and stop control is faster, which improves the accuracy of cutting.

[0029] In this embodiment, the support plate 2 is screwed to the base 1. Specifically, three screw holes 3 are provided on the base 1. The bottom of the support plate 2 is placed on the screw holes 3, and the three screws are screwed into the corresponding screw holes 3 to achieve screw fixation. The various components are mounted on the support plate 2 to form the main structure of the cam thread trimmer device.

[0030] like Figure 2 、 Figure 3 and Figure 4 As shown in the four views (including the front view, the left view, the top view and the right view), the wire assembly includes a first bearing 4 (preferably a ball bearing) and a coil support shaft 5. The first bearing 4, the coil support shaft 5 and the coil 100 are all arranged on the front side of the support plate 2 (with Figure 3 (Taking the direction shown as an example), a first mounting hole 6 is defined at one end (the upper middle portion) of the support plate 2. The first bearing 4 is inserted into one end (the thicker end) of the coil support shaft 5, which is then inserted into the central through-hole of the coil 100. The other end of the coil support shaft 5 is inserted into the first mounting hole 6. The coil 100 is mounted on the first bearing 4 through an interference fit between the coil support shaft 5 and the first bearing 4. Rotation of the coil support shaft 5 drives synchronous rotation of the first bearing 4, which in turn drives the coil 100 in synchronous rotation.

[0031] The transmission assembly includes a plurality of guide wheels 7, a plurality of guide wheel support shafts 8, and a plurality of second bearings 9; the number of guide wheels 7, guide wheel support shafts 8, and second bearings 9 is the same (preferably 3 as shown in the figure); each guide wheel 7, guide wheel support shaft 8, and second bearing 9 are arranged on the front of the support plate 2, and the middle end (upper part) of the support plate 2 is provided with second mounting holes 10, the same number as the guide wheels 7; each guide wheel support shaft 8 is inserted into the corresponding second bearing 9, and the second bearing 9 is embedded in the corresponding second mounting hole 10, one end of each guide wheel support shaft 8 passes through the middle through-hole of the corresponding guide wheel 7 and extends out, and the other end of the guide wheel support shaft 8 is inserted into the second mounting hole 10. The guide wheel 7 is installed after the guide wheel support shaft 8 and the second bearing 9 are installed by interference fit, so that the guide wheel 7 can rotate. The position of the second mounting hole 10 ensures that there is a preset interference contact between the guide wheel 7 and the drive assembly, so as to ensure that the coil 100 can be driven to rotate by friction, thereby realizing the transmission action of the wire.

[0032] The driving assembly includes a driven wheel support shaft 11, a driving wheel support shaft 12, a third bearing 13, a fourth bearing 14, a driving wheel 15, a driven wheel 16 and a transmission pulley 17; a third mounting hole 18 and a fourth mounting hole 19 (located below the three second mounting holes 10) are provided on the support plate 2, and a cam 20 is provided on the driving wheel 15, and a handle 21 is provided on the cam 20; one end of the driven wheel support shaft 11 passes through the third bearing 13 and the driven wheel 16 in sequence and extends out from the center hole of the driven wheel 16; the other end of the driven wheel support shaft 11 is inserted into the third mounting hole 18; one end of the driving wheel support shaft 12 passes through the fourth bearing 14 and the driving wheel 15 in sequence and extends out from the through hole on the cam 20; the other end of the driving wheel support shaft 12 is inserted into the fourth mounting hole 19, and the transmission pulley 17 is sleeved on the driving wheel 15 and the driven wheel 16.

[0033] The driven wheel support shaft 11 is installed with an interference fit on the third bearing 13 before the driven wheel 16 is installed to achieve rotational motion. The outer ring of the driven wheel 16 has a fully toothed structure (i.e., the entire outer ring is covered with transmission teeth). The transmission pulley 17 is made of rubber and has a fully toothed inner ring. The rotation of the drive wheel drives the transmission pulley 17 to rotate synchronously, and the driven wheel 16 rotates under the drive of the transmission pulley 17. During rotation, the transmission pulley 17 and the three guide pulleys 7 rely on friction to drive the wire rod forward.

[0034] The driving wheel support shaft 12 is installed with an interference fit on the fourth bearing 14 before the driving wheel 15 is installed to realize the rotational movement of the driving wheel 15. The driving wheel 15 is the active wheel for the rotational movement, and the cam 20 provided thereon is integrally formed with the driving wheel 15. The handle 21 is the position for manual grasping, and is eccentrically installed (i.e., the installation position is not centered) on one side of the cam 20. The driving wheel 15 can be rotated by holding the handle 21. The outer contour of the cam 20 is similar to an oval with raised points at both ends. The raised point 22 adjacent to the handle 21 is close to the edge of the driving wheel 15. Turn the handle 21 until the raised point 22 is close to the cutting assembly. Continue to rotate and press the cutting assembly down to cut the wire. Continue to rotate away from the cutting assembly, and the cutting assembly will rebound and no longer cut.

[0035] The through-hole in the cam 20 is located at the center of the drive wheel 15. Drive teeth 23 are provided on a pre-set arc segment of the outer ring of the drive wheel 15, and the protrusion 22 of the cam 20 is located on the opposite side of the drive teeth 23. Because the drive teeth 23 are only partially formed, the outer ring of the drive wheel 15, which lacks the teeth 23, cannot drive the transmission pulley to rotate, and the wire material accordingly stops advancing. This creates an intermittent transmission stagnation effect during the rotation of the drive wheel 15. During the intermittent period of stagnant transmission, the protrusion 22 rotates to the appropriate position, squeezing the slider in the cutting assembly downward, driving the cutting blade downward and achieving the cutting action.

[0036] Please also refer to Figure 5 and Figure 6 ,from Figure 5 The starting point A shown by the arrow in the figure above, Figure 5 From the motion trajectory of the stop point B shown by the arrow in the figure below, it can be seen that the length of the wire being cut is the arc length L of the outer circle of the driving wheel corresponding to the angle of the arc from the starting point A to the stop point B. The formula for the arc length L is:

[0037] L = n × π × r / 180;

[0038] Among them, L is the arc length, which is also the length of the wire being cut; n is the center angle of the circle, π is the pi, r is the radius of the driving wheel, and 180 represents the angle system.

[0039] Please continue reading Figure 2 and Figure 3 The cutting assembly includes a cutting blade 24, a tool holder 25, a material support 26, a slider holder 27, a slider 28, and a wire spring 29. The slider holder 27 is fixed (fixed by two screws) to the support plate (to the right of the drive wheel 15). The lower end of the tool holder 25 passes through the side groove of the slider holder 27 and is inserted into the inner hole of the slider holder 27. The sliding rod of the slider holder 27 moves up and down within the side groove. The slider 28 is fixed to the sliding rod of the slider holder 27. The wire spring 29 is set in the inner hole of the slider holder 27. The top of the wire spring 29 elastically contacts the lower end of the tool holder 25. The cutting blade 24 (which can be replaced and updated) is fixed (fixed by two fixing screws) in the blade groove at the top of the tool holder 25. The material support 26 is set above the slider holder 27 and fixed to the support plate.

[0040] In this embodiment, the side groove of the slider bracket 27 is equivalent to a notch in the upper left portion of the slider bracket 27. Aligned through-holes are provided on the upper and lower sides of the side groove. The inner hole of the slider bracket 27 is aligned with the through-holes. The wire spring 29 is first placed into the inner hole. The lower end of the cutter bracket 25 then passes through the through-holes on the upper and lower sides of the groove, finally inserting into the inner hole of the slider bracket 27 and contacting the wire spring 29. Because the slider 28 is fixed to the sliding rod of the slider bracket 27, when the slider 28 is pressed by the protrusion 22 on the cam 20, it drives the cutter bracket 25 downward, pressing against the wire spring 29. Simultaneously, the downward movement of the cutter bracket 25 causes the cutting blade 24 to move downward synchronously, thus cutting the wire. When the protrusion 22 leaves the slider 28, the wire spring 29 is free of force and rebounds to its initial position, lifting the cutter bracket, driving the slider 28 and the cutting blade 24 upward synchronously. When the cutting blade is not in operation, it is positioned above the wire.

[0041] A through hole can be provided on one side of the slider 28. The slider 28 is placed in the side groove of the slider bracket 27. The lower end of the tool bracket 25 then passes through the through hole on the upper groove side, the through hole on the slider 28, and the through hole on the lower groove side, and is inserted into the inner hole of the slider bracket 27. The slider 28 is then fixed to the sliding rod of the tool bracket with two screws. By adjusting the installation position of the slider 28 on the sliding rod, the lowering and ascending positions of the tool bracket can be adjusted to meet the working requirements of the cutting blade. A U-shaped bayonet can also be provided on one side of the slider 28, which is clamped on the sliding rod and then screwed in. The structure and fixing method of the slider are not limited here, as long as it can drive the tool bracket 25 to move together.

[0042] The material bracket 26 is located at the upper right of the driving wheel 15, and one end ( Figure 3The left end shown in the figure is provided with a threading hole. After the wire is moved out through the drive wheel 15, it enters the threading hole. The threading hole serves to fix the wire and limit it to prevent it from shifting during movement and affecting subsequent cutting. The bottom of one end of the material bracket 26 is provided with an arc surface that adapts to the outer wheel of the drive wheel 15, so that the material bracket 26 can be as close to the upper right part of the drive wheel 15 as possible without affecting the rotation of the drive wheel 15. The other end of the material bracket 26 is provided with a sinking surface 30, and the sinking surface is provided with a blanking chute 31. After the wire is cut, it falls into the blanking chute 31 for easy collection. The transition area between the threading hole and the sinking surface 30 is the cutting groove.

[0043] Please continue reading Figures 1 to 5 The working principle of the cam thread trimming device is as follows:

[0044] First, install the coil 100 and manually pull the wire through the threading hole at one end of the material bracket 26, just past the cutting groove. At this point, hold the coil with your left hand to prevent it from rotating. With your right hand, rotate the handle 21, rotating the cam 20. The bump 22 presses down on the slider 28, which drives the cutter bracket 25 downward, pressing the wire spring 29. The downward movement of the cutter bracket 25 drives the cutting blade 24 downward, severing the wire and achieving a smooth cut at the wire end.

[0045] Release your left hand and continue to rotate the handle 21 with your right hand. The driving wheel 15 rotates. When the tooth piece on the driving wheel 15 contacts the tooth structure of the inner ring of the transmission pulley 17, the starting point of the transmission tooth 23 is located at Figure 5 The starting point A is shown. The driving wheel 15 drives the transmission pulley 17 to continue to move forward. At this time, due to the friction force, the wire placed between the transmission pulley 17 and the guide wheel 7 will move forward synchronously with the movement of the transmission pulley 17, thereby realizing the feeding action of the wire.

[0046] When the end of the transmission tooth 23 on the driving wheel leaves the transmission pulley 17, the beginning of the transmission tooth 23 is located at Figure 5 At the stopping point B shown, the conveyor pulley 17 loses its forward force and the wire material also stops moving forward. At this time, the length of the wire material moving forward (i.e. the cutting length of the wire material) is Figure 5 The arc length L of the outer circle of the driving wheel 15 corresponding to the arc angle from the starting point A to the stopping point B. At this time, the convex point 22 is located above the slider 28.

[0047] Continue to rotate the handle 21, and the drive wheel continues to rotate. The cam 20 rotates synchronously, driving the protrusion 22 to press the slider 28 downward. The slider 28 drives the cutter bracket 25 downward to press the wire spring 29. The cutter bracket 25 moves downward, driving the cutting blade 24 downward, cutting the wire. The cut wire falls into the material chute 31 on the material holder, waiting to be collected.

[0048] Continue to rotate the handle 21. As the driving wheel 15 continues to rotate, the protrusion 22 will leave the slider 28, causing the slider 28 to lose its downward pressure. When the wire spring 29 is not under force, it rebounds to its initial state and lifts the tool holder, driving the slider 28 and the cutting blade 24 to rise synchronously, causing the cutting blade 24 to leave the cutting position and be in a non-working state.

[0049] The handle 21 is continuously rotated, and when the toothed pieces on the driving wheel 15 contact the toothed structure of the inner ring of the transmission pulley 17 again, a new cutting cycle begins, and the process is repeated until the handle 21 is stopped.

[0050] In summary, the present invention provides a pulley-driven cam-type thread trimming device. Manual rotation drives the transmission pulley, which, as it advances, relies on friction to propel the wire material forward, completing the feeding process. The transmission pulley ensures smooth power transmission, while manual rotation controls the wire feeding speed. The precise positioning of the cam and cam, as well as the length of the transmission teeth, ensure consistent and reliable cutting action and the precise length of each cut wire section. This improves the efficiency and accuracy of cutting, and reduces the likelihood of trimming errors and rework.

[0051] It can be adjusted and optimized according to different cutting requirements and working environments. For example, by changing the profile of the cam, adjusting the transmission ratio of the transmission pulley, or adjusting the length of the transmission teeth, different cutting speeds and forces can be achieved, which is suitable for cutting a variety of materials and thicknesses.

[0052] The entire transmission and drive assembly is relatively simple in structure, resulting in low maintenance costs. If the transmission pulley becomes worn or damaged, it can be easily replaced. The cam structure is highly durable and will remain in good working condition with regular lubrication and inspection.

[0053] The division of the above functional modules is only for illustration. In actual applications, the above functions can be assigned to different functional modules as needed, that is, divided into different functional modules to complete all or part of the functions described above.

[0054] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and utility model concept of the present invention, and all these changes or substitutions should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A cam wire cutting device driven by a pulley, used for cutting wire on a coil, characterized in that: The machine comprises a base and a support plate, wherein the support plate is fixed to the base, and a wire loading assembly, a transmission assembly, a drive assembly and a cutting assembly are arranged on the support plate; the coil is mounted on the wire loading assembly, the wire loading assembly and the drive assembly are arranged side by side, the transmission assembly is located above the drive assembly, and the cutting assembly is arranged on one side of the drive assembly; When the driving assembly moves, it drives the transmission assembly to rotate, the transmission assembly drives the wire material on the coil to move for feeding, and the driving assembly controls the cutting assembly to intermittently cut the wire material.

2. The pulley-driven cam thread trimming device according to claim 1, characterized in that: The wire assembly includes a first bearing and a coil support shaft, and a first mounting hole is provided at one end of the support plate; the first bearing is inserted into one end of the coil support shaft and then into the through hole in the middle of the coil, and the other end of the coil support shaft is inserted into the first mounting hole.

3. The pulley-driven cam thread trimming device according to claim 2, characterized in that: The transmission assembly includes several guide wheels, several guide wheel support shafts and several second bearings; the middle end of the support plate is provided with second mounting holes with the same number as the guide wheels; each guide wheel support shaft is inserted into the corresponding second bearing, and the second bearing is embedded in the corresponding second mounting hole, one end of each guide wheel support shaft passes through the through hole in the middle of the corresponding guide wheel and extends out, and the other end of the guide wheel support shaft is inserted into the second mounting hole.

4. The pulley-driven cam thread trimming device according to claim 3, characterized in that: The coil support shaft is interference fit with the first bearing, and the guide wheel support shaft is interference fit with the second bearing.

5. The pulley-driven cam thread trimming device according to claim 4, characterized in that: The driving assembly includes a driven wheel support shaft, a driving wheel support shaft, a third bearing, a fourth bearing, a driving wheel, a driven wheel and a transmission pulley; a third mounting hole and a fourth mounting hole are provided on the support plate, a cam is provided on the driving wheel, and a handle is provided on the cam; One end of the driven wheel support shaft passes through the third bearing and the driven wheel in sequence and extends out from the center hole of the driven wheel; the other end of the driven wheel support shaft is inserted into the third mounting hole; one end of the driving wheel support shaft passes through the fourth bearing and the driving wheel in sequence and extends out from the through hole on the cam; the other end of the driving wheel support shaft is inserted into the fourth mounting hole, and the transmission pulley is sleeved on the driving wheel and the driven wheel.

6. The pulley-driven cam thread trimming device according to claim 5, characterized in that: The outer ring of the driven wheel and the inner ring of the transmission pulley are full transmission teeth; the preset arc section on the outer ring of the driving wheel is provided with transmission teeth.

7. The pulley-driven cam thread trimming device according to claim 5, characterized in that: The cam is integrally formed with the driving wheel, and the convex point on the cam is arranged between the handle and the edge of the driving wheel, and the convex point is located on the opposite side of the transmission teeth on the driving wheel.

8. The pulley-driven cam thread trimming device according to claim 7, characterized in that: The cutting assembly includes a cutting blade, a tool holder, a material holder, a slider holder, a slider and a wire spring; The slider bracket is fixed on the support plate; the lower end of the tool bracket passes through the side groove of the slider bracket and is inserted into the inner hole of the slider bracket, and the sliding rod of the slider bracket moves up and down in the side groove; the slider is fixed on the sliding rod of the slider bracket, and the wire spring is arranged in the inner hole of the slider bracket. The top of the wire spring is in elastic contact with the lower end of the tool bracket, and the cutting blade is fixed in the knife groove at the top of the tool bracket. The material bracket is arranged above the slider bracket and fixed on the support plate.

9. The pulley-driven cam thread trimming device according to claim 8, characterized in that: A through hole is provided on one side of the slider, and the slider is placed in the side groove of the slider bracket. The lower end of the tool bracket passes through the through hole on the upper groove edge of the side groove, the through hole on the slider, and the through hole on the lower groove edge of the side groove in sequence, and is inserted into the inner hole of the slider bracket; the slider is screwed and fixed to the sliding rod of the tool bracket.

10. The pulley-driven cam thread trimming device according to claim 8, characterized in that: One end of the material bracket is provided with a threading hole, and the wire is moved out by the driving wheel and enters the threading hole. The other end of the material bracket is provided with a sinking surface, and the sinking surface is provided with a blanking chute.

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