Thread cutting equipment for violin tuning button

Abstract

The invention relates to the technical field of thread cutting, in particular to a violin tuning knob thread cutting device which comprises a base, an extension frame is fixed to the end of the base, a cooling groove is formed in the surface of the extension frame, an arc-shaped plate is arranged on the surface of the extension frame, and two sets of swing rods are arranged at the top of the base. A rotating rod is arranged in the swing rod, a first open groove and a positioning groove are formed in the surface of the swing rod, first teeth and second teeth are arranged on the surface of the rotating rod, a fixing hole is formed in the end of the rotating rod, a gear is arranged at the top of the base, and the gear can rotate; the device has the beneficial effects that a jacking plate makes contact with a button, an air cylinder is started, the air cylinder drives a piston rod to stretch out, the piston rod pushes two sets of positioning plates, a first telescopic rod stretches out of an extension rod, the positioning plates abut against positioning grooves in the surface of a swing rod, the position of the swing rod is stabilized, and the stability of the tuning button machined is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of thread cutting, and particularly to a thread cutting device for a violin tuning knob. Background Art

[0002] The tuning knobs are located at the head of the violin, usually four, two on each side. By rotating the tuning knobs, the tension of the strings can be changed, thereby adjusting the pitch of the strings and enabling the violin to produce accurate tones.

[0003] In the prior art, the patent number is CN100528440C, and the name is a blade for thread cutting. Even in the latter half cycle of the radial plunge grinding method, the chip can be reliably curled and the discharge direction can be controlled. A cutting edge is formed on the edge portion of the rake face formed on the blade body. The cutting edge has a pair of thread cutting edges that form a convex V shape in a top view facing the rake face, and a finishing edge connected to the rear end of the thread cutting edge. The inner part of the convex V formed by the thread cutting edges in the top view of the rake face does not protrude beyond the thread cutting edges. And on the rake face further rearward than the finishing edge, a first protrusion protruding from the rake face, a second protrusion with a protruding height higher than that of the first protrusion, and a third protrusion with a protruding height higher than those of the first and second protrusions are prominently provided, wherein the first and second protrusions are closer to the cutting edge side than the third protrusion.

[0004] However, the existing thread cutting device fixes the tuning knob and then performs thread cutting. After the tuning knob needs to be removed, another set of tuning knobs is fixed and the cutting continues, resulting in low processing efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide a thread cutting device for a violin tuning knob to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A thread cutting device for a violin tuning knob, comprising: A base, an extension frame is fixed at the end of the base, a cooling groove is provided on the surface of the extension frame, an arc-shaped plate is provided on the surface of the extension frame, a swing rod is provided on the top of the base, there are two groups of swing rods, a rotating rod is provided inside the swing rod, a first slot and a positioning slot are provided on the surface of the swing rod, a first tooth and a second tooth are provided on the surface of the rotating rod, a fixing hole is provided at the end of the rotating rod, and a gear is provided on the top of the base, and the gear can rotate.

[0007] Preferably, a transverse movement rod is provided on one side of the base. The end of the transverse movement rod is connected to a pushing device which drives the transverse movement rod to move. A cutter head is fixed at the other end of the transverse movement rod. A support rod is fixed on the surface of the base. A support bracket and a first motor are fixed at the top of the support rod. A second motor is also fixed at the top of the support rod. A rotating shaft is inserted into the interior of the support bracket. The first motor can drive the rotating shaft to rotate. A rotating rod is inserted into the interior of a swinging rod and can rotate within the swinging rod. The second motor can drive a gear to rotate.

[0008] Preferably, a tuning knob is inserted into the fixing hole and is fixed inside the fixing hole. Two groups of positioning grooves are formed on the surface of the swinging rod. Multiple groups of first teeth are fixed on the surface of the rotating rod located in the first slot. The first teeth rotate with the rotating rod. Multiple groups of second teeth are fixed on the surface of the rotating rod on the side exposed outside the swinging rod. The second teeth rotate with the rotating rod. The swinging rod rotates with the rotating shaft. When the swinging rod rotates to the surface of the gear, the teeth on the surface of the gear mesh with the first teeth, and the rotation of the gear can drive the rotating rod to rotate.

[0009] Preferably, a vertical plate is fixed on the surface of the base. A cylinder is fixed on the surface of the vertical plate. A piston rod is provided on the surface of the vertical plate. The cylinder can drive the piston rod to perform telescopic movement. Two groups of positioning plates are fixed at the other end of the piston rod. The positioning plates move with the piston rod. An extension rod is fixed on the surface of the vertical plate. A first telescopic rod is inserted into the end of the extension rod. The first telescopic rod can perform telescopic movement within the extension rod. The other end of the first telescopic rod is fixed on the surface of the positioning plate.

[0010] Preferably, an L-shaped plate is fixed on the surface of the vertical plate. A button is provided on the surface of the L-shaped plate. The button is connected to the cylinder and can drive the cylinder to work. A second telescopic rod is inserted into the L-shaped plate. The second telescopic rod can perform telescopic movement within the L-shaped plate. A force-bearing plate is fixed at the end of the second telescopic rod. The second telescopic rod moves with the force-bearing plate.

[0011] Preferably, a round hole is formed on the surface of the gear. A plugging rod is inserted into the round hole and can move within the round hole. A holding plate is fixed at the end of the plugging rod. Multiple groups of the holding plate and the plugging rod are provided. The holding plate moves with the plugging rod. Multiple groups of rollers are provided on the surface of the holding plate. The rollers can be arranged on the surface of the holding plate. And the force-bearing plate is inserted into the round hole. When the gear rotates, due to centrifugal force, the plugging rod is inserted into the interior of the gear. The holding plate moves with the plugging rod and holds against the surface of the force-bearing plate, causing the second telescopic rod to be inserted into the L-shaped plate, and after the force-bearing plate moves, it contacts the end of the button.

[0012] Preferably, two groups of connecting rods are fixed on the surface of the rotating shaft, and the other ends of the connecting rods are fixed on the surface of the swinging rod. After the rotating shaft rotates, the swinging rod is driven to rotate through the connecting rods.

[0013] Preferably, multiple groups of third teeth are arranged on the surface of the extension frame. When the swinging rod swings along with the rotating shaft and passes over the top of the extension frame, the second teeth on the surface of the rotating rod come into contact with the third teeth, causing the rotating rod to rotate.

[0014] Preferably, an L-shaped pipe is fixed on the surface of the extension frame, an arc-shaped plate is fixed on the top of the L-shaped pipe, and a brush and a water spraying hole are arranged at the bottom of the arc-shaped plate.

[0015] Preferably, the inside of the L-shaped pipe communicates with the inside of the extension frame, a coolant is placed inside the extension frame, the inside of the L-shaped pipe communicates with the inside of the arc-shaped plate, and through a driving device, the coolant in the extension frame can enter the inside of the arc-shaped plate through the L-shaped pipe and spray out from the water spraying holes at the bottom of the arc-shaped plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: When processing the tuning knob on the surface of one group of swinging rods in the present invention, the tuning knob can be fixed in the fixing hole at the end of the other group of swinging rods. And when the swinging rod rotates to drive the surface of the gear, the gear rotates. Due to the centrifugal force, the holding plate is thrown to the middle position of the round hole, the inserting rod extends out of the gear, the holding plate contacts the stress plate, causing the second telescopic rod to be inserted into the inside of the L-shaped plate. The holding plate contacts the button, turning on the air cylinder. The air cylinder drives the piston rod to extend, and the piston rod pushes two groups of positioning plates, causing the first telescopic rod to extend out of the extension rod. The positioning plates hold in the positioning grooves on the surface of the swinging rod, stabilizing the position of the swinging rod and ensuring the stability of the tuning knob during the processing of the tuning knob. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the present invention.

[0018] Figure 2 It is a schematic structural diagram of another perspective of the present invention.

[0019] Figure 3 It is a schematic bottom view structural diagram of the present invention.

[0020] Figure 4 It is a schematic structural diagram of the swinging rod of the present invention.

[0021] Figure 5 It is a schematic structural diagram of the extension frame of the present invention.

[0022] Figure 6 It is a schematic sectional structural diagram of the present invention.

[0023] Figure 7Schematic diagram of the vertical plate structure of the present invention.

[0024] Figure 8 Schematic diagram of the positioning plate structure of the present invention.

[0025] Figure 9 This is Figure 8 Enlarged schematic diagram of the structure at position A in

[0026] Figure 10 Schematic diagram of the gear structure of the present invention.

[0027] In the figure: base 1, extension frame 2, transverse movement rod 3, cutter head 4, support rod 5, bearing bracket 6, rotating shaft 7, swing rod 8, first slot 9, connecting rod 10, first tooth 11, positioning slot 12, rotating rod 13, second tooth 14, fixing hole 15, third tooth 16, cooling groove 17, L-shaped pipe 18, arc-shaped plate 19, first motor 20, second motor 21, gear 22, piston rod 23, cylinder 24, vertical plate 25, positioning plate 26, first telescopic rod 27, extension rod 28, button 29, second telescopic rod 30, force-bearing plate 31, L-shaped plate 32, round hole 33, insertion rod 34, roller 35, top-holding plate 36. Detailed implementation manners

[0028] In order to clearly and completely describe the objectives, technical solutions of the present invention, and make the advantages more clear, the following further details the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are some but not all of the embodiments of the present invention, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0029] Please refer to Figures 1 to 10 , the present invention provides a technical solution: Embodiment 1: A thread cutting device for a violin tuning knob, comprising: a base 1, an extension frame 2 is fixed at the end of the base 1, a cooling groove 17 is provided on the surface of the extension frame 2, an arc-shaped plate 19 is arranged on the surface of the extension frame 2, a swing rod 8 is arranged on the top of the base 1, there are two groups of swing rods 8, a rotating rod 13 is arranged inside the swing rod 8, a first slot 9 and a positioning slot 12 are provided on the surface of the swing rod 8, a first tooth 11 and a second tooth 14 are arranged on the surface of the rotating rod 13, a fixing hole 15 is provided at the end of the rotating rod 13, a gear 22 is arranged on the top of the base 1, the gear 22 can rotate. When the swing rod 8 rotates and touches the surface of the gear 22, the gear 22 rotates. Due to the centrifugal force, the top-holding plate 36 is thrown to the middle position of the round hole 33, the insertion rod 34 extends out of the gear 22, the top-holding plate 36 contacts the force-bearing plate 31, and the second telescopic rod 30 is inserted into the L-shaped plate 32.

[0030] Embodiment 2: On the basis of Embodiment 1, a transverse rod 3 is arranged on one side of the base 1. The end of the transverse rod 3 is connected to a pushing device, and the pushing device drives the transverse rod 3 to move. The other end of the transverse rod 3 is fixed with a cutter head 4. A support rod 5 is fixed on the surface of the base 1. A support bracket 6 and a first motor 20 are fixed on the top of the support rod 5. A second motor 21 is also fixed on the top of the support rod 5. A rotating shaft 7 is inserted into the inside of the support bracket 6. The first motor 20 can drive the rotating shaft 7 to rotate. A rotating rod 13 is inserted into the inside of a swinging rod 8, and the rotating rod 13 can rotate inside the swinging rod 8. The second motor 21 can drive a gear 22 to rotate. Two groups of connecting rods 10 are fixed on the surface of the rotating shaft 7. The other ends of the connecting rods 10 are fixed on the surface of the swinging rod 8. After the rotating shaft 7 rotates, the swinging rod 8 is driven to rotate through the connecting rods 10. Multiple groups of third teeth 16 are arranged on the surface of the extension frame 2. When the swinging rod 8 swings along with the rotating shaft 7 and passes over the top of the extension frame 2, the second teeth 14 on the surface of the rotating rod 13 come into contact with the third teeth 16, causing the rotating rod 13 to rotate. An L-shaped pipe 18 is fixed on the surface of the extension frame 2. An arc-shaped plate 19 is fixed on the top of the L-shaped pipe 18. A brush and a water spraying hole are arranged at the bottom of the arc-shaped plate 19. The inside of the L-shaped pipe 18 is communicated with the inside of the extension frame 2. A coolant is placed inside the extension frame 2. The inside of the L-shaped pipe 18 is communicated with the inside of the arc-shaped plate 19. Through a driving device, the coolant in the extension frame 2 can enter the inside of the arc-shaped plate 19 through the L-shaped pipe 18 and spray out from the water spraying holes at the bottom of the arc-shaped plate 19. There is coolant in the cooling groove 17. The coolant is sucked into the inside of the arc-shaped plate 19 through the L-shaped pipe 18. A brush and spraying holes are arranged at the bottom of the arc-shaped plate 19. The cooling liquid sprays out through the spraying holes at the bottom of the arc-shaped plate 19 and sprays on the surface of the tuning knob in the fixing hole 15. The tuning knob is inserted into the fixing hole 15 and fixed inside the fixing hole 15. Two sets of positioning grooves 12 are formed on the surface of the swing rod 8. A plurality of first teeth 11 are fixed on the surface of the rotating rod 13 located in the first slot 9. The first teeth 11 rotate with the rotating rod 13. A plurality of second teeth 14 are fixed on the surface of the rotating rod 13 on the side exposed outside the swing rod 8. The second teeth 14 rotate with the rotating rod 13. The swing rod 8 rotates with the rotating shaft 7. When the swing rod 8 rotates to the surface of the gear 22, the teeth on the surface of the gear 22 mesh with the first teeth 11. The rotation of the gear 22 can drive the rotating rod 13 to rotate. A round hole 33 is formed on the surface of the gear 22. An insertion rod 34 is inserted into the round hole 33. The insertion rod 34 can move inside the round hole 33. A holding plate 36 is fixed at the end of the insertion rod 34. There are multiple sets of the holding plate 36 and the insertion rod 34. The holding plate 36 moves with the insertion rod 34. A plurality of rollers 35 are arranged on the surface of the holding plate 36. The rollers 35 can be arranged on the surface of the holding plate 36. And the force-receiving plate 31 is inserted into the round hole 33. When the gear 22 rotates, due to the centrifugal force, the insertion rod 34 is inserted into the inside of the gear 22. The holding plate 36 moves with the insertion rod 34 and holds against the surface of the force-receiving plate 31, so that the second telescopic rod 30 is inserted into the L-shaped plate 32. And after the force-receiving plate 31 moves, it contacts the end of the button 29. When the gear 22 rotates, due to the centrifugal force, the holding plate 36 is thrown to the middle position of the round hole 33. The insertion rod 34 extends out of the gear 22. The holding plate 36 contacts the force-receiving plate 31, so that the second telescopic rod 30 is inserted into the L-shaped plate 32.

[0031] A vertical plate 25 is fixed on the surface of the base 1. A cylinder 24 is fixed on the surface of the vertical plate 25. A piston rod 23 is arranged on the surface of the vertical plate 25. The cylinder 24 can drive the piston rod 23 to perform telescopic movement. The other end of the piston rod 23 is fixed with two sets of positioning plates 26. The positioning plates 26 move with the piston rod 23. An extension rod 28 is fixed on the surface of the vertical plate 25. A first telescopic rod 27 is inserted into the end of the extension rod 28. The first telescopic rod 27 can perform telescopic movement inside the extension rod 28. The other end of the first telescopic rod 27 is fixed on the surface of the positioning plate 26. An L-shaped plate 32 is fixed on the surface of the vertical plate 25. A button 29 is arranged on the surface of the L-shaped plate 32. The button 29 is connected to the cylinder 24. The button 29 can drive the cylinder 24 to work. A second telescopic rod 30 is inserted into the surface of the L-shaped plate 32. The second telescopic rod 30 can perform telescopic movement inside the L-shaped plate 32. A force-receiving plate 31 is fixed at the end of the second telescopic rod 30. The second telescopic rod 30 moves with the force-receiving plate 31. The holding plate 36 is thrown to the middle position of the round hole 33. The insertion rod 34 extends out of the gear 22. The holding plate 36 contacts the force-receiving plate 31, so that the second telescopic rod 30 is inserted into the L-shaped plate 32. The holding plate 36 contacts the button 29.

[0032] The transverse movement rod 3 drives the cutter head 4 to move to the end of the swing rod 8. The tuning knob is inserted and fixed in the fixing hole 15. The first motor 20 drives the rotating shaft 7 to rotate. The rotating shaft 7 rotates inside the supporting bracket 6. The rotating shaft 7 drives the connecting rod 10 to rotate, so that the two groups of swing rods 8 exchange positions. The gear 22 abuts against the first slot 9. The teeth on the surface of the gear 22 mesh with the first teeth 11. The second motor 21 drives the gear 22 to rotate, so that the rotating rod 13 rotates along with the gear 22. The tuning knob in the fixing hole 15 rotates, and the cutter head 4 performs thread cutting on the tuning knob. After the cutting is completed, the rotating shaft 7 drives the swing rod 8 to rotate. After the swing rod 8 rotates, the second teeth 14 on the surface of the rotating rod 13 contact the third teeth 16 on the surface of the extension bracket 2. The rotating rod 13 continues to rotate, and there is coolant in the cooling groove 17. The coolant is sucked into the inside of the arc-shaped plate 19 through the L-shaped pipe 18. The bottom of the arc-shaped plate 19 is provided with a brush and spraying holes. The cooling liquid is sprayed out through the spraying holes at the bottom of the arc-shaped plate 19 and sprayed on the surface of the tuning knob in the fixing hole 15. And the tuning knob passes through the brush to clean the debris on the surface of the tuning knob. When processing the tuning knob on the surface of one group of swing rods 8, the tuning knob can be fixed in the fixing hole 15 at the end of the other group of swing rods 8. And when the swing rod 8 rotates to the surface of the gear 22, the gear 22 rotates. Due to the centrifugal force, the abutting plate 36 is thrown to the middle position of the round hole 33, and the plugging rod 34 extends out of the gear 22. The abutting plate 36 contacts the stress plate 31, so that the second telescopic rod 30 is plugged into the L-shaped plate 32. The abutting plate 36 contacts the button 29 to turn on the air cylinder 24. The air cylinder 24 drives the piston rod 23 to extend. The piston rod 23 pushes two groups of positioning plates 26, so that the first telescopic rod 27 extends out of the extension rod 28. The positioning plates 26 abut against the positioning grooves 12 on the surface of the swing rod 8 to stabilize the position of the swing rod 8 and ensure the stability of the tuning knob during the processing of the tuning knob.

[0033] Although the above describes the illustrative specific embodiments of the present application for the convenience of those skilled in the art to understand the present application, the present application is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present application defined and determined by the appended claims, all application creations using the concept of the present application are within the scope of protection.

Claims

1. A thread cutting device for a violin tuning knob, characterized in that: Comprising: A base (1), an extension frame (2) is fixed at the end of the base (1), a cooling groove (17) is formed on the surface of the extension frame (2), an arc-shaped plate (19) is arranged on the surface of the extension frame (2), a swing rod (8) is arranged on the top of the base (1), there are two groups of swing rods (8), a rotating rod (13) is arranged inside the swing rod (8), a first slot (9) and a positioning slot (12) are formed on the surface of the swing rod (8), a first tooth (11) and a second tooth (14) are arranged on the surface of the rotating rod (13), a fixing hole (15) is formed at the end of the rotating rod (13), a gear (22) is arranged on the top of the base (1), and the gear (22) can rotate.

2. The thread cutting device for a violin tuning knob according to claim 1, characterized in that: A cross-moving rod (3) is arranged on one side of the base (1), the end of the cross-moving rod (3) is connected to a pushing device, the pushing device drives the cross-moving rod (3) to move, a cutter head (4) is fixed at the other end of the cross-moving rod (3), a support rod (5) is fixed on the surface of the base (1), a supporting bracket (6) and a first motor (20) are fixed on the top of the support rod (5), a second motor (21) is also fixed on the top of the support rod (5), a rotating shaft (7) is inserted into the supporting bracket (6), the first motor (20) can drive the rotating shaft (7) to rotate, the rotating rod (13) is inserted into the swing rod (8), and the rotating rod (13) can rotate inside the swing rod (8), and the second motor (21) can drive the gear (22) to rotate.

3. The thread cutting device for a violin tuning knob according to claim 2, characterized in that: A tuning knob is inserted into the fixing hole (15), and the tuning knob is fixed inside the fixing hole (15), two groups of positioning slots (12) are formed on the surface of the swing rod (8), multiple groups of first teeth (11) are fixed on the surface of the rotating rod (13) located in the first slot (9), the first teeth (11) rotate with the rotating rod (13), multiple groups of second teeth (14) are fixed on the surface of the rotating rod (13) on the side exposed outside the swing rod (8), the second teeth (14) rotate with the rotating rod (13), the swing rod (8) rotates with the rotating shaft (7), when the swing rod (8) rotates to the surface of the gear (22), the teeth on the surface of the gear (22) mesh with the first teeth (11), and the rotation of the gear (22) can drive the rotating rod (13) to rotate.

4. The thread cutting device for a violin tuning knob according to claim 3, characterized in that: A vertical plate (25) is fixed on the surface of the base (1), a cylinder (24) is fixed on the surface of the vertical plate (25), a piston rod (23) is arranged on the surface of the vertical plate (25), the cylinder (24) can drive the piston rod (23) to perform telescopic movement, two groups of positioning plates (26) are fixed at the other end of the piston rod (23), the positioning plates (26) move with the piston rod (23), an extension rod (28) is fixed on the surface of the vertical plate (25), a first telescopic rod (27) is inserted into the end of the extension rod (28), the first telescopic rod (27) can perform telescopic movement inside the extension rod (28), and the other end of the first telescopic rod (27) is fixed on the surface of the positioning plate (26).

5. The thread cutting device for a violin tuning knob according to claim 4, characterized in that: The surface of the vertical plate (25) is fixed with an L-shaped plate (32). A button (29) is arranged on the surface of the L-shaped plate (32). The button (29) is connected to a cylinder (24). The button (29) can drive the cylinder (24) to work. A second telescopic rod (30) is inserted into the surface of the L-shaped plate (32). The second telescopic rod (30) can telescopically move inside the L-shaped plate (32). A force-receiving plate (31) is fixed at the end of the second telescopic rod (30). The second telescopic rod (30) moves along with the force-receiving plate (31).

6. The thread cutting device for a violin tuning knob according to claim 5, characterized in that: A round hole (33) is formed in the surface of the gear (22). An insertion rod (34) is inserted into the round hole (33). The insertion rod (34) can move inside the round hole (33). A holding plate (36) is fixed at the end of the insertion rod (34). Multiple groups of the holding plate (36) and the insertion rod (34) are provided. The holding plate (36) moves along with the insertion rod (34). Multiple groups of rollers (35) are arranged on the surface of the holding plate (36). The rollers (35) can be arranged on the surface of the holding plate (36). And the force-receiving plate (31) is inserted into the round hole (33). When the gear (22) rotates, due to centrifugal force, the insertion rod (34) is inserted into the inside of the gear (22). The holding plate (36) moves along with the insertion rod (34) and holds against the surface of the force-receiving plate (31), so that the second telescopic rod (30) is inserted into the inside of the L-shaped plate (32), and after the force-receiving plate (31) moves, it contacts the end of the button (29).

7. A thread cutting device for a violin tuning knob according to claim 6, characterized in that: Two groups of connecting rods (10) are fixed on the surface of the rotating shaft (7). The other ends of the connecting rods (10) are fixed on the surface of the swinging rod (8). After the rotating shaft (7) rotates, it drives the swinging rod (8) to rotate through the connecting rods (10).

8. A thread cutting device for a violin tuning knob according to claim 7, characterized in that: Multiple groups of third teeth (16) are arranged on the surface of the extension frame (2). When the swinging rod (8) swings along with the rotating shaft (7) and passes over the top of the extension frame (2), the second teeth (14) on the surface of the rotating rod (13) contact the third teeth (16), causing the rotating rod (13) to rotate.

9. The thread cutting device for a violin tuning knob according to claim 8, characterized in that: An L-shaped pipe (18) is fixed on the surface of the extension frame (2). An arc-shaped plate (19) is fixed at the top of the L-shaped pipe (18). A brush and a water spraying hole are arranged at the bottom of the arc-shaped plate (19). The coolant is sucked into the inside of the arc-shaped plate (19) through the L-shaped pipe (18). A brush and a spraying hole are arranged at the bottom of the arc-shaped plate (19). The coolant is sprayed out through the spraying hole at the bottom of the arc-shaped plate (19) and sprayed on the surface of the tuning knob in the fixing hole (15).

10. A thread cutting device for a violin tuning knob according to claim 9, characterized in that: The interior of the L-shaped tube (18) communicates with the interior of the extension bracket (2). Coolant is placed inside the extension bracket (2). The interior of the L-shaped tube (18) communicates with the interior of the arc-shaped plate (19). Through the driving device, the coolant in the extension bracket (2) can enter the interior of the arc-shaped plate (19) through the L-shaped tube (18) and spray out from the water spray holes at the bottom of the arc-shaped plate (19). The tuning knob passes through the brush to clean the debris on the surface of the tuning knob. When processing the tuning knob on the surface of one set of swing rods (8), the tuning knob can be fixed in the fixing holes (15) at the ends of the other set of swing rods (8).

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