Stable and reliable roller type capo convenient in position adjustment

Abstract

The utility model discloses a roller type capo which is convenient in position adjustment, stable and reliable, and comprises a folding arm assembly and a roller assembly, the folding arm assembly adopts a hidden camshaft folding arm and comprises a front clamping arm, a rear clamping arm, a front pressing arm, a rear pressing arm, a hinge shaft and a clamping spring, the top of the front pressing arm is rotationally connected to the top of the front clamping arm, the top of the rear pressing arm is rotationally connected to the middle of the rear clamping arm, the front clamping arm is sleeved with the front pressing arm when the front pressing arm is folded, and the rear pressing arm is embedded into the rear clamping arm when the rear pressing arm is folded; the rolling wheel assembly is of a three-rolling-wheel structure and comprises a front rolling wheel assembly and two rear rolling wheel assemblies, the front rolling wheel assembly and the two rear rolling wheel assemblies are all vertically installed, and the width of the portion, arranged side by side, of the two rear rolling wheel assemblies is larger than that of the rear clamping arm. Folding operation is convenient and reliable, and the whole tuning clamp is small in size and attractive and elegant in appearance after being folded; clamping is stable and reliable, the rear clamping arm can be prevented from shaking during sliding, smooth and reliable sliding is guaranteed, and tuning precision is guaranteed.

Description

Technical Field

[0001] The utility model relates to a guitar auxiliary tool, in particular to a roller-type capo with convenient position adjustment and stable and reliable operation. Background Art

[0002] The original purpose of the capo was to adjust the pitch of the guitar. It is a common auxiliary tool in folk guitar playing and singing. When changing the key, it can press the existing fret to raise the tune to a corresponding interval, so that it can be coordinated with the singer's voice. The original fingering method is used to play, which greatly reduces the difficulty of changing the key. It is widely used in the performance of flamenco guitar, classical guitar and folk guitar. When used for solo repertoire, the capo is often placed between the first and fourth frets, among which the second fret has the highest frequency, and the use above the fourth fret is basically only seen in accompaniment.

[0003] Existing capos are roughly divided into two categories, one is fixed clamping, and the other is slidable clamping. Existing sliding clamping capos have the following defects: 1. Since they are equipped with rollers, they generally have more parts and a more complicated structure. On the one hand, the clamping operation is more troublesome, and on the other hand, the pressing arm is exposed to the outside after clamping, resulting in a larger volume of the entire tuning clamp, affecting the aesthetics; 2. Generally, a double roller structure is adopted, that is, a front roller is installed on the front clamping arm, and a rear roller is installed on the rear clamping arm. On the one hand, since the rollers are curved surfaces, double fulcrum clamping is adopted during clamping, which affects its clamping stability; on the other hand, since the width of the rear clamping arm is usually larger than the width of the rear roller, when sliding, the rear clamping arm is usually pushed hard, resulting in a certain amount of shaking of the rear clamping arm, which not only affects the smoothness of sliding, but also affects the accuracy of tuning. Utility Model Content

[0004] In order to solve the defects and shortcomings in the above-mentioned prior art, the utility model provides a method of clamping by using front and rear two folding arms in conjunction with front and rear clamping arms. On the one hand, the folding operation is convenient and reliable, and on the other hand, the front pressing arm can be sleeved outside the front clamping arm, and the rear pressing arm can be embedded in the rear clamping arm, so that the entire tuning clamp can be kept as small as possible and has a beautiful appearance. A three-point clamping structure with two rear roller groups and one front roller group is adopted, so that the clamping is stable and reliable, and the shaking of the rear clamping arm can be prevented during sliding, thereby ensuring smooth and reliable sliding, thereby ensuring the tuning accuracy. A roller-type capo with convenient position adjustment and stable and reliable performance is provided.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a roller-type capo with convenient position adjustment and stable and reliable performance, comprising a folding arm assembly and a roller assembly that cooperate with each other,

[0006] The folding arm assembly adopts a hidden camshaft folding arm, which includes a front clamping arm, a rear clamping arm, a front pressing arm installed on the front clamping arm, and a rear pressing arm installed on the rear clamping arm, as well as a hinge shaft and a clamping spring that cooperate with the front clamping arm and the rear clamping arm. The top of the front pressing arm is rotatably connected to the top of the front clamping arm, and the top of the rear pressing arm is rotatably connected to the middle part of the rear clamping arm. When the front pressing arm is folded, it is sleeved outside the front clamping arm, and the single-side width of the front pressing arm matches the side width of the front clamping arm. When the rear pressing arm is folded, it is embedded in the rear clamping arm. A limiting protrusion is provided on the top of the front pressing arm, and a limiting cam head is provided on the top of the rear pressing arm.

[0007] The roller assembly adopts a three-roller structure, which includes a front roller assembly installed on the front clamping arm and two rear roller assemblies installed on the rear clamping arm. The front roller assembly and the two rear roller assemblies are installed vertically. The width of the two rear roller assemblies arranged side by side is greater than the width of the rear clamping arm, and a gap is left between the two rear roller assemblies. The front roller assembly is aligned between the two rear roller assemblies.

[0008] The utility model adopts front and rear two folding arms to cooperate with front and rear clamping arms for clamping. On the one hand, the folding operation is convenient and reliable. On the other hand, the front pressing arm can be sleeved outside the front clamping arm, and the rear pressing arm can be embedded in the rear clamping arm, so that the entire tuning clamp can be kept as small as possible and has a beautiful appearance. The three-point clamping structure of two rear roller groups and one front roller group is adopted, so that the clamping is stable and reliable, and the rear clamping arm can be prevented from shaking during sliding, ensuring smooth and reliable sliding, thereby ensuring tuning accuracy.

[0009] Preferably, the front roller assembly includes a front roller and a front roller shaft, a front roller sleeve is provided inside the front roller, and both ends of the front roller sleeve are connected to the front roller shaft through front roller bearings respectively; the outer diameter of the front roller gradually decreases from both ends to the middle, and front roller bearing seats matching the front roller bearings are provided at both ends of the front roller sleeve, and front roller bearing seat limiting rings matching the front roller bearing seats are provided at both ends of the front roller.

[0010] This structure ensures the clamping strength of the front roller on the one hand, and the installation stability of the front roller on the other hand; at the same time, it allows the front roller to match the shape of the front of the guitar well on the one hand, and ensures the sliding smoothness and reliability of the front roller on the other hand.

[0011] Preferably, the two ends of the front roller shaft are respectively installed on the front clamping arm through a front limit seat and a front limit bolt that cooperate with each other. The front limit seat is provided with at least one front limit bolt hole, and the end of the front roller shaft extends into the front limit seat and is limited by the front limit bolt; the front end of the front limit bolt is screwed into the front limit bolt hole, and the bolt head of the front limit bolt limits the front roller shaft axially.

[0012] This structure facilitates the limiting of the front roller shaft, thereby facilitating the limiting of the front roller; and further ensures the reliability of the limiting of the front roller.

[0013] Preferably, the rear roller assembly includes a rear roller and a rear roller shaft, a rear roller sleeve is provided inside the rear roller, and both ends of the front roller sleeve are connected to the rear roller shaft through rear roller bearings respectively; the outer diameter of the rear roller gradually decreases from both ends to the middle, and rear roller bearing seats that match the rear roller bearings are provided at both ends of the rear roller sleeve, and rear roller bearing seat limit rings that match the rear-front roller bearing seats are provided at both ends of the rear roller.

[0014] This structure ensures the clamping strength of the rear roller on the one hand, and the installation stability of the rear roller on the other hand; at the same time, it allows the rear roller to match the shape of the front of the guitar well on the one hand, and ensures the sliding stability and reliability of the rear roller on the other hand.

[0015] Preferably, the two ends of the rear roller shaft are respectively installed on the rear clamping arm through a rear limit seat and a rear limit bolt that cooperate with each other. The rear limit seat is provided with a rear limit bolt hole, and the end of the rear roller shaft extends into the rear limit seat and is limited by the rear limit bolt; the front end of the rear limit bolt is screwed into the rear limit bolt hole, and the middle part and the bolt head of the rear limit bolt limit the rear roller shaft axially.

[0016] This structure facilitates the limiting of the rear roller shaft, thereby facilitating the limiting of the rear roller; and further ensures the reliability of the limiting of the rear roller.

[0017] Preferably, the top of the front pressing arm is rotatably connected to the hinge shaft of the front clamping arm and the rear clamping arm through a hinge lug, the top of the rear clamping arm is sleeved on the outer side of the top of the front clamping arm, and the top of the front pressing arm is sleeved on the outer side of the top of the rear clamping arm. The limiting protrusion is located on the hinge lug, and the rear clamping arm is provided with a limiting protrusion that matches the limiting protrusion; a first damping ring is provided between the hinge lug and the rear clamping arm, a limiting plate is provided at the bottom of the front pressing arm, and the bottom of the front clamping arm is provided with a limiting recess that matches the limiting plate and a limiting convex strip that matches the bottom ring of the front pressing arm.

[0018] This structure ensures that the rotation and opening position (limited by limiting protrusions and limiting bumps) of the front pressing arm are stable and reliable, thereby ensuring the clamping effect; at the same time, the front pressing arm will be subjected to a certain damping force during the rotation process, so that it will not be in hard contact with other parts and cause wear during the opening and closing process. In addition, it will be well limited when it is completely folded (limited by limiting plates, limiting recesses and limiting convex strips).

[0019] Preferably, the upper part of the rear clamping arm is inclined, and the lower part of the rear clamping arm is vertically arranged; the limit cam head is rotatably connected to the middle bend of the rear clamping arm through a cam shaft; the rear clamping arm is provided with a cam limit groove that matches the limit cam head; the back of the rear clamping arm is provided with a rear pressing arm mounting groove that matches the rear pressing arm, and the depth of the rear pressing arm mounting groove is less than or equal to the thickness of the rear pressing arm; the bottom of the rear clamping arm and the bottom of the rear pressing arm are provided with mutually matching magnetic suction components, the two sides of the limit cam head and the second damping ring at the connection between the cam shaft, and the rear clamping arm is provided with a plurality of decorative pieces that match the rear limit seat.

[0020] This structure further facilitates the limiting of the rear clamping arm on the rear pressing arm (through the cam limiting groove and the limiting cam head); further facilitates the installation of the rear clamping arm on the rear pressing arm; at the same time, the rear pressing arm will be subjected to a certain damping force during the rotation process, so that it will not be in hard contact with other parts and cause wear during the opening and folding process. In addition, it will be well limited when it is completely folded (through the magnetic suction component), further improving its appearance.

[0021] Preferably, first damping ring limiting grooves matching the first damping ring are provided on both sides of the top of the rear clamping arm, and second damping ring limiting grooves matching the second damping ring are provided on both sides of the limiting cam head; the first damping ring and the second damping ring are both made of rubber material.

[0022] This structure ensures the damping effect during the rotation of the front pressing arm and the rear pressing arm.

[0023] Preferably, a limit head is provided at one end of the hinge shaft, an internal thread matching the limit bolt head is provided at the other end of the hinge shaft, and a cover plate matching the hinge shaft and a cover plate limit groove matching the cover plate are provided on the outer side of the hinge lug.

[0024] This structure ensures the stability and reliability of the connection between the top of the front clamping arm, the top of the rear clamping arm and the top of the front pressing arm.

[0025] Preferably, an adjusting rod is provided at one end of the clamping spring, and an adjusting channel matching the adjusting rod is provided at the top of the front clamping arm. The adjusting rod and the adjusting channel are both arranged horizontally, and an adjusting hole matching the adjusting channel is provided on the front side of the top of the front clamping arm, an external thread is provided on the outer side of the adjusting rod, and an internal thread matching the external thread is provided on the inner side of the adjusting channel. The rear end of the adjusting rod is fixed on the clamping spring, and an observation hole for observing the rear end position of the adjusting rod and a scale for recording the rear end position of the adjusting rod are provided on the top surface of the front clamping arm. The front end of the adjusting rod is aligned with the adjusting hole, and the front end of the adjusting rod is a hexagonal adjustment end, a flat-head screwdriver adjustment end, or a cross screwdriver adjustment end.

[0026] This structure makes it possible to properly adjust the tension of the clamping spring, thereby adjusting the clamping force between the front clamping arm and the rear clamping arm, thereby ensuring the accuracy of the pitch adjustment. This can be achieved by simply turning the adjustment rod with an Allen screwdriver, a flat-head screwdriver, or a Phillips screwdriver. The design of the observation hole and the scale makes it possible to obtain the best adjustment position by simply adjusting it once during the sound test, without having to adjust it every time for the sound test.

[0027] The utility model adopts front and rear two folding arms to cooperate with front and rear clamping arms for clamping. On the one hand, the folding operation is convenient and reliable. On the other hand, the front pressing arm can be sleeved outside the front clamping arm, and the rear pressing arm can be embedded in the rear clamping arm, so that the entire tuning clamp can be kept as small as possible and has a beautiful appearance. The three-point clamping structure of two rear roller groups and one front roller group is adopted, so that the clamping is stable and reliable, and the rear clamping arm can be prevented from shaking during sliding, ensuring smooth and reliable sliding, thereby ensuring tuning accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the utility model;

[0029] Figure 2 This is an exploded schematic diagram of one angle of the present invention;

[0030] Figure 3 It is an exploded schematic diagram of the utility model from another angle;

[0031] Figure 4 It is an exploded schematic diagram of the front roller assembly in the utility model;

[0032] Figure 5 It is a structural schematic diagram of the front roller assembly of the utility model being installed on the front clamping arm;

[0033] Figure 6 It is an exploded schematic diagram of the rear roller assembly in the utility model;

[0034] Figure 7 It is a schematic diagram of the structure in which the rear roller assembly of the utility model is installed on the rear clamping arm;

[0035] Figure 8 It is an exploded schematic diagram of the articulated shaft in the utility model;

[0036] Fig. 9 It is a top view schematic diagram of the utility model;

[0037] In the figure: 1. front clamping arm, 2. rear clamping arm, 3. front pressing arm, 4. rear pressing arm, 5. clamping spring, 6. hinge shaft, 7. limiting protrusion, 8. limiting cam head, 9. hinge lug, 10. limiting convex block, 11. front roller, 12. front roller shaft, 13. front roller sleeve, 14. front roller bearing, 15. front roller bearing seat, 16. front roller bearing seat limiting ring, 17. front limiting seat, 18. front limiting bolt, 19. front limiting bolt hole, 20. limiting head, 21. rear roller, 22. rear roller shaft, 23. rear roller sleeve, 24. rear roller bearing, 25. rear roller Wheel bearing seat, 26. Rear roller bearing seat limiting ring, 27. Rear limiting seat, 28. Rear limiting bolt, 29. Rear limiting bolt hole, 30. Decorative piece, 31. First damping ring, 32. Second damping ring, 33. Limiting piece, 34. Limiting concave, 35. Limiting convex strip, 36. Camshaft, 37. Cam limiting groove, 38. Rear pressing arm mounting groove, 39. Magnetic suction assembly, 40. Cover plate, 41. First damping ring limiting groove, 42. Second damping ring limiting groove, 43. Cover plate limiting groove, 44. Limiting bolt head, 45. Adjusting rod, 46. Adjusting hole, 47. Observation hole, 48. Scale. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the scope of the utility model. In addition, in the following description, the description of the known structure and technology is omitted to avoid unnecessary confusion of the concept of the utility model.

[0039] like Figure 1-9As shown, a roller-type capo with convenient position adjustment and stable and reliable performance comprises a folding arm assembly and a roller assembly which cooperate with each other. The folding arm assembly adopts a hidden camshaft folding arm, comprising a front clamping arm 1, a rear clamping arm 2, a front pressing arm 3 installed on the front clamping arm 1, and a rear pressing arm 4 installed on the rear clamping arm 2, as well as a hinge shaft 6 and a clamping spring 5 which cooperate with the front clamping arm 1 and the rear clamping arm 2. The top of the front pressing arm 3 is rotatably connected to the top of the front clamping arm 1, and the top of the rear pressing arm 4 is rotatably connected to the middle of the rear clamping arm 2. When the front pressing arm 3 is folded, it is sleeved outside the front clamping arm 1, and the single-side width of the front pressing arm 3 matches the side width of the front clamping arm 1. When the rear pressing arm 4 is folded, it is embedded in the rear clamping arm 2. A limiting protrusion 7 is provided on the top of the front pressing arm 3, and a limiting cam head 8 is provided on the top of the rear pressing arm 4. The top of the front pressing arm 3 is rotatably connected to the hinge shaft 6 of the front clamping arm 1 and the rear clamping arm 2 through the hinge lug 9, the top of the rear clamping arm 2 is sleeved on the outside of the top of the front clamping arm 1, the top of the front pressing arm 3 is sleeved on the outside of the top of the rear clamping arm 2, the limiting protrusion 7 is located on the hinge lug 9, and the rear clamping arm 2 is provided with a limiting protrusion 10 that matches the limiting protrusion 7. A first damping ring 31 is provided between the hinge lug 9 and the top of the rear clamping arm 2, a limiting sheet 33 is provided at the bottom of the front pressing arm 3, and a limiting concave 34 that matches the limiting sheet 33 and a limiting convex strip 35 that matches the bottom circle of the front pressing arm 3 are provided at the bottom of the front clamping arm 1. The upper part of the rear clamping arm 2 is inclined, and the lower part of the rear clamping arm 2 is vertically arranged. The limiting cam head 8 is rotatably connected to the middle bend of the rear clamping arm 2 through a cam shaft 36. The rear clamping arm 2 is provided with a cam limiting groove 37 that matches the limiting cam head 8. The back of the rear clamping arm 2 is provided with a rear pressing arm mounting groove 38 that matches the rear pressing arm 4, and the depth of the rear pressing arm mounting groove 38 is less than the thickness of the rear pressing arm 4. The bottom of the rear clamping arm 2 and the bottom of the rear pressing arm 4 are provided with a mutually matching magnetic suction component 39, and the two sides of the limiting cam head 37 and the second damping ring 32 are connected at the cam shaft 36. The top of the rear clamping arm 2 is provided with a first damping ring limiting groove 41 that matches the first damping ring 31, and the two sides of the limiting cam head 8 are provided with a second damping ring limiting groove 42 that matches the second damping ring 32. The first damping ring 31 and the second damping ring 32 are both made of rubber material. A limit head 20 is provided at one end of the hinge shaft 6, a limit bolt head 44 and an internal thread matching the limit bolt head 44 are provided at the other end of the hinge shaft 6, and a cover plate 40 matching the hinge shaft 6 and a cover plate limit groove 43 matching the cover plate 40 are provided on the outer side of the hinge lug 9.

[0040] The roller assembly adopts a three-roller structure, including a front roller assembly installed on the front clamping arm 1 and two rear roller assemblies installed on the rear clamping arm 2. The front roller assembly and the two rear roller assemblies are installed vertically. The width of the two rear roller assemblies arranged side by side is greater than the width of the rear clamping arm 2, and a gap is left between the two rear roller assemblies. The front roller assembly is aligned between the two rear roller assemblies.

[0041] The front roller assembly includes a front roller 11 and a front roller shaft 12. A front roller sleeve 13 is provided inside the front roller 11. Both ends of the front roller sleeve 13 are connected to the front roller shaft 12 through front roller bearings 14. The outer diameter of the front roller 11 gradually decreases from both ends to the middle. Both ends of the front roller sleeve 13 are provided with front roller bearing seats 15 that match the front roller bearings 14. Both ends of the front roller 11 are provided with front roller bearing seat limit rings 16 that match the front roller bearing seats 15. Both ends of the front roller shaft 12 are respectively installed on the front clamping arm 1 through front limit seats 17 and front limit bolts 18 that match each other. Two front limit bolt holes 19 are provided on the top front limit seat 17, and one front limit bolt hole 19 is provided on the bottom front limit seat 17. The end of the front roller shaft 12 extends into the front limit seat 17 and is limited by the front limit bolt 18. The front end of the front limiting bolt 18 is screwed into the front limiting bolt hole 19 , and the bolt head of the front limiting bolt 18 limits the front roller shaft 12 axially.

[0042] The rear roller assembly includes a rear roller 21 and a rear roller shaft 22. A rear roller sleeve 23 is provided inside the rear roller 21. Both ends of the front roller sleeve 23 are connected to the rear roller shaft 22 through rear roller bearings 24. The outer diameter of the rear roller 21 gradually decreases from both ends to the middle. Both ends of the rear roller sleeve 23 are provided with rear roller bearing seats 25 that match the rear roller bearings 24. Both ends of the rear roller 21 are provided with rear roller bearing seat limiting rings 26 that match the rear front roller bearing seats 25. Both ends of the rear roller shaft 22 are respectively installed on the rear clamping arm 2 through a rear limiting seat 27 and a rear limiting bolt 28 that match each other. The rear limiting seat 27 is provided with a rear limiting bolt hole 29. The end of the rear roller shaft 22 extends into the rear limiting seat 27 and is limited by the rear limiting bolt 28. The front end of the rear limiting bolt 28 is screwed into the rear limiting bolt hole 29 , and the middle part and the bolt head of the rear limiting bolt 28 axially limit the rear roller shaft 22 ; four decorative pieces 30 matching the rear limiting seat 27 are provided on the rear clamping arm 2 .

[0043] An adjusting rod 45 is provided at one end of the clamping spring 5, and an adjusting channel matching the adjusting rod 45 is provided at the top of the front clamping arm 1. The adjusting rod 45 and the adjusting channel are both arranged horizontally, and an adjusting hole 46 matching the adjusting channel is provided on the front side of the top of the front clamping arm 1. An external thread is provided on the outer side of the adjusting rod 45, and an internal thread matching the external thread is provided on the inner side of the adjusting channel. The rear end of the adjusting rod 45 is fixed on the clamping spring 5, and an observation hole 47 for observing the rear end position of the adjusting rod 45 and a scale 48 for recording the rear end position of the adjusting rod 45 are provided on the top surface of the front clamping arm 1. The front end of the adjusting rod 45 is aligned with the adjusting hole 46, and the front end of the adjusting rod 45 is a hexagonal adjustment end, a flat-head screwdriver adjustment end, or a cross screwdriver adjustment end.

[0044] The clamping spring in the utility model adopts a clamping spring structure. When folded up (initial state), the front clamping arm and the rear clamping arm clamp the clamping spring and are in a clamping state under the tension of the clamping spring, while the front pressing arm is sleeved outside the front clamping arm, and the rear pressing arm is embedded in the rear clamping arm, which is basically hidden, and the product volume can be greatly reduced; when it is needed to be used, the front pressing arm and the rear pressing arm are opened, and after the front pressing arm is flipped to a certain angle, the limiting protrusion is limited The cam head is limited by the cam limit groove after the rear pressing arm rotates to a certain angle. At this time, the front clamping arm and the rear clamping arm are pressed slightly to compress the clamping spring, so that the front clamping arm and the rear clamping arm can be opened. After the tuning clip is placed at the specified position of the guitar, the front pressing arm and the rear pressing arm are released, the clamping spring is reset, the front clamping arm and the rear clamping arm clamp the specified position of the guitar, the front roller presses against the front side of the guitar, and the rear roller presses against the back side of the guitar.

[0045] When the tuning is required, the tuning rod can be adjusted by gently turning the tuning rod with an inner hexagonal screwdriver, a flat-blade screwdriver or a cross screwdriver. In the initial state, the rear end position of the tuning rod is located at the minimum scale position of the scale. When the tuning rod is rotated to press the clamping spring, the tensioning force of the clamping spring will be increased, so that the front and rear clamping arms are clamped tighter. When the rear end position of the tuning rod reaches the maximum scale position of the scale, the tensioning force of the clamping spring is the largest and the clamping is the tightest. At this time, the tensioning force cannot be further increased; and when the tuning rod is rotated to loosen the clamping spring, the tensioning force of the clamping spring will be reduced, so that the front and rear clamping arms are clamped looser, until the rear end position of the tuning rod returns to the minimum scale position of the scale. Of course, this adjustment is only fine-tuning. During the adjustment process, once the pitch is accurate, the adjustment can be stopped, and then the position of the rear end of the tuning rod can be observed through the observation hole and the scale at this time can be recorded; thereby, when testing the sound, the optimal adjustment position can be obtained by adjusting it once, and there is no need to adjust the sound test every time.

[0046] When the utility model needs to slide, fingers move the tuning clamp to make it slide on the guitar. Since the width of the two rear rollers arranged side by side is slightly larger than the width of the rear clamping arm, the rear clamping arm can be well prevented from shaking when the tuning clamp slides.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A roller-type capo with convenient position adjustment and stable and reliable performance, comprising a folding arm assembly and a roller assembly that cooperate with each other, characterized in that: The folding arm assembly adopts a hidden camshaft folding arm, which includes a front clamping arm, a rear clamping arm, a front pressing arm installed on the front clamping arm, and a rear pressing arm installed on the rear clamping arm, as well as a hinge shaft and a clamping spring that cooperate with the front clamping arm and the rear clamping arm. The top of the front pressing arm is rotatably connected to the top of the front clamping arm, and the top of the rear pressing arm is rotatably connected to the middle part of the rear clamping arm. When the front pressing arm is folded, it is sleeved outside the front clamping arm, and the single-side width of the front pressing arm matches the side width of the front clamping arm. When the rear pressing arm is folded, it is embedded in the rear clamping arm. A limiting protrusion is provided on the top of the front pressing arm, and a limiting cam head is provided on the top of the rear pressing arm. The roller assembly adopts a three-roller structure, which includes a front roller assembly installed on the front clamping arm and two rear roller assemblies installed on the rear clamping arm. The front roller assembly and the two rear roller assemblies are installed vertically. The width of the two rear roller assemblies arranged side by side is greater than the width of the rear clamping arm, and a gap is left between the two rear roller assemblies. The front roller assembly is aligned between the two rear roller assemblies.

2. A roller-type capo with convenient position adjustment and reliable stability as claimed in claim 1, characterized in that: The front roller assembly includes a front roller and a front roller shaft, a front roller sleeve is provided inside the front roller, and both ends of the front roller sleeve are connected to the front roller shaft through front roller bearings respectively; the outer diameter of the front roller gradually decreases from both ends to the middle, and front roller bearing seats matching the front roller bearings are provided at both ends of the front roller sleeve, and front roller bearing seat limiting rings matching the front roller bearing seats are provided at both ends of the front roller.

3. A roller-type capo with convenient position adjustment and reliable stability as claimed in claim 2, characterized in that: The two ends of the front roller shaft are respectively installed on the front clamping arm through a front limit seat and a front limit bolt that cooperate with each other. The front limit seat is provided with at least one front limit bolt hole. The end of the front roller shaft extends into the front limit seat and is limited by the front limit bolt; the front end of the front limit bolt is screwed into the front limit bolt hole, and the bolt head of the front limit bolt limits the front roller shaft axially.

4. A roller-type capo with convenient position adjustment and reliable stability as claimed in claim 1, characterized in that: The rear roller assembly includes a rear roller and a rear roller shaft, a rear roller sleeve is provided inside the rear roller, and both ends of the front roller sleeve are connected to the rear roller shaft through rear roller bearings respectively; the outer diameter of the rear roller gradually decreases from both ends to the middle, and rear roller bearing seats matching the rear roller bearings are provided at both ends of the rear roller sleeve, and rear roller bearing seat limiting rings matching the rear front roller bearing seats are provided at both ends of the rear roller.

5. A roller-type capo with convenient position adjustment and reliable stability as claimed in claim 4, characterized in that: The two ends of the rear roller shaft are respectively installed on the rear clamping arm through a rear limit seat and a rear limit bolt that cooperate with each other. The rear limit seat is provided with a rear limit bolt hole, and the end of the rear roller shaft extends into the rear limit seat and is limited by the rear limit bolt; the front end of the rear limit bolt is screwed into the rear limit bolt hole, and the middle part and the bolt head of the rear limit bolt limit the rear roller shaft axially.

6. A roller-type capo with convenient position adjustment and reliable stability as claimed in claim 5, characterized in that: The top of the front pressing arm is rotatably connected to the hinge shaft of the front clamping arm and the rear clamping arm through a hinge lug, the top of the rear clamping arm is sleeved on the outer side of the top of the front clamping arm, and the top of the front pressing arm is sleeved on the outer side of the top of the rear clamping arm. The limiting protrusion is located on the hinge lug, and the rear clamping arm is provided with a limiting protrusion that matches the limiting protrusion; a first damping ring is provided between the hinge lug and the top of the rear clamping arm, a limiting plate is provided at the bottom of the front pressing arm, and the bottom of the front clamping arm is provided with a limiting concave that matches the limiting plate and a limiting convex strip that matches the bottom ring of the front pressing arm.

7. A roller-type capo with convenient position adjustment and reliable stability as claimed in claim 6, characterized in that: The upper part of the rear clamping arm is inclined, and the lower part of the rear clamping arm is vertically arranged. The limit cam head is rotatably connected to the middle bend of the rear clamping arm through a cam shaft, and the rear clamping arm is provided with a cam limit groove that matches the limit cam head; the back of the rear clamping arm is provided with a rear pressing arm mounting groove that matches the rear pressing arm, and the depth of the rear pressing arm mounting groove is less than or equal to the thickness of the rear pressing arm; the bottom of the rear clamping arm and the bottom of the rear pressing arm are provided with mutually matching magnetic suction components, and the two sides of the limit cam head and the second damping ring are connected at the cam shaft. The rear clamping arm is provided with a plurality of decorative pieces that match the rear limit seat.

8. A roller-type capo with convenient position adjustment and reliable stability as claimed in claim 7, characterized in that: The top two sides of the rear clamping arm are provided with first damping ring limiting grooves matching the first damping ring, and the two sides of the limiting cam head are provided with second damping ring limiting grooves matching the second damping ring; the first damping ring and the second damping ring are both made of rubber material.

9. The roller-type capo with convenient position adjustment and reliable stability as claimed in claim 6, characterized in that: A limit head is provided at one end of the hinge shaft, a limit bolt head and an internal thread matching the limit bolt head are provided at the other end of the hinge shaft, and a cover plate matching the hinge shaft and a cover plate limit groove matching the cover plate are provided on the outer side of the hinge lug.

10. The roller-type capo with convenient position adjustment and reliable stability as claimed in claim 1, characterized in that: An adjusting rod is provided at one end of the clamping spring, and an adjusting channel matching the adjusting rod is provided at the top of the front clamping arm. The adjusting rod and the adjusting channel are both arranged horizontally, and an adjusting hole matching the adjusting channel is provided on the front side of the top of the front clamping arm, an external thread is provided on the outer side of the adjusting rod, and an internal thread matching the external thread is provided on the inner side of the adjusting channel. The rear end of the adjusting rod is fixed on the clamping spring, and an observation hole for observing the rear end position of the adjusting rod and a scale for recording the rear end position of the adjusting rod are provided on the top surface of the front clamping arm. The front end of the adjusting rod is aligned with the adjusting hole, and the front end of the adjusting rod is a hexagonal adjustment end, a flat-head screwdriver adjustment end, or a cross screwdriver adjustment end.

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