Stable and reliable roller-type capo with convenient position adjustment

Abstract

A stable and reliable roller-type capo with convenient position adjustment, comprising a folding arm assembly and a roller assembly. The folding arm assembly adopts a concealed camshaft folding arm and comprises a front clamping arm (1), a rear clamping arm (2), a front pressing arm (3), a rear pressing arm (4), a hinge shaft (6), and a clamping spring (5); the top of the front pressing arm (3) is rotatably connected to the top of the front clamping arm (1); the top of the rear pressing arm (4) is rotatably connected to the middle of the rear clamping arm (2); the front pressing arm (3), when retracted, fits over the front clamping arm (1), and the rear pressing arm (4), when retracted, nests inside the rear clamping arm (2). The roller assembly adopts a three-roller structure and comprises a front roller assembly and two rear roller assemblies; the front roller assembly and the two rear roller assemblies are all vertically mounted; and the width of the two rear roller assemblies arranged side by side is greater than the width of the rear clamping arm. The folding operation of the capo is convenient and reliable, and when folded, the whole capo features a compact size and an aesthetically pleasing appearance. The capo provides stable and reliable clamping, and can prevent the rear clamping arm from shaking during sliding, thereby guaranteeing smooth and reliable sliding, and ensuring tuning precision.

Description

Position adjustment convenient and stable and reliable roller type tuning clamp TECHNICAL FIELD

[0001] The present application relates to a guitar auxiliary tool, in particular to a position adjustment convenient and stable and reliable roller type tuning clamp. BACKGROUND

[0002] The original purpose of the tuning clamp is to adjust the pitch of the guitar, which is a commonly used auxiliary tool in the folk guitar singing and playing, and can press the product to make the tune higher by the corresponding interval when the tuning is changed, so as to coordinate with the singer's voice, and the original finger method is played, which greatly reduces the difficulty of tuning. It is widely used in flamenco guitar, classical guitar and folk guitar playing. When used in solo performance, the tuning clamp is usually placed between the first to fourth products, and the frequency of the second product is the highest, which is higher than that of the fourth product. The use of the fourth product is basically only used in accompaniment.

[0003] The existing tuning clamp is roughly divided into two categories, one is fixed clamping, and the other is sliding clamping. The existing sliding clamping type tuning clamp has the following defects: 1. Because of the equipped roller, the general parts are more, the structure is more complex, on the one hand, the clamping operation is more troublesome, on the other hand, the pressing arm is exposed after clamping, which leads to the whole tuning clamp with large volume, affecting the aesthetic degree; 2. Generally, a double roller structure is adopted, that is, a front clamping arm is equipped with a front roller, and a rear clamping arm is equipped with a rear roller. This structure, on the one hand, because the roller is arc, double support point clamping is adopted when clamping, which affects the clamping stability; on the other hand, because the width of the rear clamping arm is usually larger than that of the rear roller, and the rear clamping arm is usually forced to be pushed when sliding, the rear clamping arm will produce a certain shaking, which not only affects the smoothness of sliding, but also affects the tuning accuracy. SUMMARY

[0004] In order to solve the defects and deficiencies in the prior art, the present application provides a roller type tuning clamp with position adjustment convenient and stable and reliable, which adopts front and rear two folding arms to cooperate with front and rear two 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 whole tuning clamp can maintain as small as possible volume, and the appearance is elegant and generous; the three support point clamping structure of two rear roller groups cooperating with a front roller group is adopted, so that the clamping is stable and reliable, and the rear clamping arm can be prevented from shaking when sliding, the sliding is smooth and reliable, and the tuning accuracy is ensured.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme: a position adjustment convenient and stable and reliable roller type tuning clamp, comprising a folding arm assembly and a roller assembly which cooperate with each other,

[0006] The folding arm assembly adopts a hidden camshaft folding arm, which comprises a front clamping arm, a rear clamping arm, a front pressing arm mounted on the front clamping arm, a rear pressing arm mounted on the rear clamping arm, and a hinge shaft and a clamping spring matched 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, the top of the rear pressing arm is rotatably connected to the middle of the rear clamping arm, the front pressing arm is sleeved outside the front clamping arm when being retracted, the single-side width of the front pressing arm matches the side width of the front clamping arm, the rear pressing arm is embedded in the rear clamping arm when being retracted, the top of the front pressing arm is provided with a limiting protrusion, and the top of the rear pressing arm is provided with a limiting cam head.

[0007] The roller assembly adopts a three-roller structure, which comprises a front roller assembly mounted on the front clamping arm and two rear roller assemblies mounted on the rear clamping arm, the front roller assembly and the two rear roller assemblies are vertically mounted, 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, and the front roller assembly is aligned between the two rear roller assemblies.

[0008] The folding arm assembly adopts two front and rear folding arms matched with two front and rear clamping arms for clamping, on the one hand, 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 maintain a small size and an elegant appearance as much as possible; the three-point clamping structure of two rear roller assemblies matched with a front roller assembly makes clamping stable and reliable, and can prevent the rear clamping arm from shaking when sliding, so as to ensure smooth and reliable sliding and tuning accuracy.

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

[0010] The structure ensures the clamping strength of the front roller and the installation stability of the front roller, and on the one hand, the front roller can well match the shape of the front of the guitar, and on the other hand, the sliding stability and reliability of the front roller are ensured.

[0011] Preferably, the two ends of the front roller shaft are mounted on the front clamping arm through a matched front limiting seat and a front limiting bolt, at least one front limiting bolt hole is arranged on the front limiting seat, the end of the front roller shaft is inserted into the front limiting seat and limited through the front limiting bolt, the front end of the front limiting bolt is screwed into the front limiting bolt hole, and the bolt head of the front limiting bolt axially limits the front roller shaft.

[0012] The structure is convenient for limiting the front roller shaft, thereby conveniently limiting the front roller, and further ensures the reliability of limiting the front roller.

[0013] Preferably, the rear roller assembly comprises a rear roller and a rear roller shaft, the rear roller is internally provided with a rear roller shaft sleeve, and the two ends of the rear roller shaft sleeve are connected with the rear roller shaft through rear roller bearings respectively; the outer diameter of the rear roller gradually decreases from the two ends to the middle, the two ends of the rear roller shaft sleeve are provided with rear roller bearing seats matched with the rear roller bearings, and the two ends of the rear roller are provided with rear roller bearing seat limiting rings matched with the rear roller bearing seats.

[0014] The structure ensures the clamping strength of the rear roller and the mounting stability of the rear roller, and on the one hand, the rear roller can be well matched with the shape of the front of the guitar, and on the other hand, the sliding stability and reliability of the rear roller are ensured.

[0015] Preferably, the two ends of the rear roller shaft are mounted on the rear clamping arm through mutually matched rear limiting seats and rear limiting bolts respectively, the rear limiting seat is provided with a rear limiting bolt hole, the end of the rear roller shaft extends into the rear limiting seat and is limited through the rear limiting bolt, the front end of the rear limiting bolt is screwed into the rear limiting bolt hole, and the middle and bolt head of the rear limiting bolt axially limit the rear roller shaft.

[0016] The structure is convenient for limiting the rear roller shaft, thereby conveniently limiting the rear roller, and further ensures the reliability of limiting the rear roller.

[0017] Preferably, the top of the front pressing arm is rotationally 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 outside the top of the front clamping arm, the top of the front pressing arm is sleeved outside 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 block matched with the limiting protrusion; a first damping ring is arranged between the hinge lug and the rear clamping arm, the bottom of the front pressing arm is provided with a limiting piece, the bottom of the front clamping arm is provided with a limiting inner recess matched with the limiting piece and a limiting protrusion matched with the bottom of the front pressing arm.

[0018] The structure ensures that the rotation and opening position of the front pressing arm are stably and reliably limited (limited through the limiting protrusion and the limiting block), thereby ensuring the clamping effect; meanwhile, the front pressing arm will be subjected to a certain damping force in the process of rotation, so that it will not be in hard contact with other components to produce abrasion in the process of opening and folding, and the front pressing arm will be well limited (limited through the limiting piece, the limiting inner recess and the limiting protrusion) when being completely folded.

[0019] Preferably, the upper part of the rear clamping arm is obliquely arranged, the lower part of the rear clamping arm is vertically arranged, the limiting cam head is rotatably connected to the middle bending part of the rear clamping arm through a cam shaft, and the rear clamping arm is provided with a cam limiting groove matched with the limiting cam head; the back of the rear clamping arm is provided with a rear pressing arm mounting groove matched with 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 a magnetic attraction assembly matched with each other, the second damping ring is arranged at the connection between the two sides of the limiting cam head and the cam shaft, and the rear clamping arm is provided with a plurality of decorative pieces matched with rear limiting seats.

[0020] The structure further facilitates the limiting (limited by the cam limiting groove and the limiting cam head) of the rear pressing arm by the rear clamping arm, further facilitates the mounting of the rear pressing arm by the rear clamping arm, simultaneously, the rear pressing arm receives a certain damping force in the rotating process, so that the rear pressing arm does not produce abrasion by hard contact with other components in the opening and folding process, and the rear pressing arm is well limited (limited by the magnetic attraction assembly) when completely folded, and the appearance is further improved.

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

[0022] The structure ensures the damping effect of the front pressing arm and the rear pressing arm in the rotating process.

[0023] Preferably, one end of the hinge shaft is provided with a limiting head, the other end of the hinge shaft is provided with an internal thread matched with the limiting bolt head, the outer side of the hinge lug is provided with a cover plate matched with the hinge shaft and a cover plate limiting groove matched with the cover plate.

[0024] The 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, one end of the clamping spring is provided with an adjusting rod, the top of the front clamping arm is provided with an adjusting channel matched with the adjusting rod, the adjusting rod and the adjusting channel are both transversely arranged, the front side of the top of the front clamping arm is provided with an adjusting hole matched with the adjusting channel, the outer side of the adjusting rod is provided with an external thread, the inner side of the adjusting channel is provided with an internal thread matched with the external thread, the rear end of the adjusting rod is fixed on the clamping spring, the top surface of the front clamping arm is provided with an observation hole for observing the position of the rear end of the adjusting rod and a scale for recording the position of the rear end of the adjusting rod, the front end of the adjusting rod is aligned with the adjusting hole, and the front end of the adjusting rod is an internal hexagonal adjusting end or a slotted screwdriver adjusting end or a cross screwdriver adjusting end.

[0026] The structure can adjust the tension of the clamping spring, thereby adjusting the clamping force between the front clamping arm and the rear clamping arm, ensuring the tuning accuracy, and only needing to slightly turn the adjusting rod by using a hexagonal or a straight or cross screwdriver; and the observation hole and the scale are designed, so that the optimal adjustment position can be obtained only by once adjustment during the sound test.

[0027] The two folding arms are used in cooperation with the front and rear clamping arms for clamping, 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 whole tuning clamp can maintain a small size and an elegant appearance; the three-point clamping structure of two rear roller groups cooperating with 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 and thereby ensuring the tuning accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 is a structural schematic diagram of the present application;

[0029] Fig. 2 is an exploded schematic diagram of one angle of the present application;

[0030] Fig. 3 is an exploded schematic diagram of another angle of the present application;

[0031] Fig. 4 is an exploded schematic diagram of a front roller assembly in the present application;

[0032] Fig. 5 is a structural schematic diagram of the front roller assembly installed on the front clamping arm of the present application;

[0033] Fig. 6 is an exploded schematic diagram of a rear roller assembly in the present application;

[0034] Fig. 7 is a structural schematic diagram of the rear roller assembly installed on the rear clamping arm of the present application;

[0035] Fig. 8 is an exploded schematic diagram of a hinge shaft in the present application;

[0036] Fig. 9 is a top view schematic diagram of the present application;

[0037] In the figure: 1. front clamping arm, 2. rear clamping arm, 3. front pressing arm, 4. rear pressing arm, 5. clamping spring, 6. hinged shaft, 7. limiting protrusion, 8. limiting cam head, 9. hinged lug, 10. limiting block, 11. front roller, 12. front roller shaft, 13. front roller shaft 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 shaft sleeve, 24. rear roller bearing, 25. rear roller bearing seat, 26. rear roller bearing seat limiting ring, 27. rear limiting seat, 28. rear limiting bolt, 29. rear limiting bolt hole, 30. decorative sheet, 31. first damping ring, 32. second damping ring, 33. limiting sheet, 34. limiting concave, 35. limiting protrusion, 36. cam shaft, 37. cam limiting slot, 38. rear pressing arm installation slot, 39. magnetic attraction assembly, 40. cover plate, 41. first damping ring limiting slot, 42. second damping ring limiting slot, 43. cover plate limiting slot, 44. limiting bolt head, 45. adjusting rod, 46. adjusting hole, 47. observation hole, 48. scale. DETAILED DESCRIPTION

[0038] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with the accompanying drawings and examples. However, it should be understood that the specific examples described herein are only used to explain the present application and do not limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0039] As shown in FIG. 1-9, a roller type variable clamp with convenient and stable position adjustment comprises a folding arm assembly and a roller assembly. 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 mounted on the front clamping arm 1, a rear pressing arm 4 mounted on the rear clamping arm 2, a hinge shaft 6 cooperating with the front clamping arm 1 and the rear clamping arm 2, and a clamping spring 5. The top of the front pressing arm 3 is rotatably connected to the top of the front clamping arm 1. The top of the rear pressing arm 4 is rotatably connected to the middle of the rear clamping arm 2. The front pressing arm 3 is retracted 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. The rear pressing arm 4 is retracted inside the rear clamping arm 2. The top of the front pressing arm 3 is provided with a limiting protrusion 7, and the top of the rear pressing arm 4 is provided with a limiting cam head 8. 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 a hinge lug 9. The top of the rear clamping arm 2 is retracted outside the top of the front clamping arm 1. The top of the front pressing arm 3 is retracted outside the top of the rear clamping arm 2. The limiting protrusion 7 is located on the hinge lug 9. The rear clamping arm 2 is provided with a limiting protrusion 10 cooperating with the limiting protrusion 7. A first damping ring 31 is arranged between the hinge lug 9 and the top of the rear clamping arm 2. The bottom of the front pressing arm 3 is provided with a limiting sheet 33. The bottom of the front clamping arm 1 is provided with a limiting concave 34 cooperating with the limiting sheet 33 and a limiting protrusion 35 cooperating with the bottom ring of the front pressing arm 3. The upper part of the rear clamping arm 2 is inclined, and the lower part of the rear clamping arm 2 is vertical. The limiting cam head 8 is rotatably connected to the middle bending part of the rear clamping arm 2 through a cam shaft 36. The rear clamping arm 2 is provided with a cam limiting groove 37 cooperating with the limiting cam head 8. The back of the rear clamping arm 2 is provided with a rear pressing arm mounting groove 38 cooperating with the rear pressing arm 4. 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 magnetic attraction assembly 39 cooperating with each other. The two sides of the limiting cam head 37 and the connecting part of the cam shaft 36 are provided with a second damping ring 32. The two sides of the top of the rear clamping arm 2 are provided with a first damping ring limiting groove 41 cooperating with the first damping ring 31. The two sides of the limiting cam head 8 are provided with a second damping ring limiting groove 42 cooperating with the second damping ring 32. The first damping ring 31 and the second damping ring 32 are both made of rubber material. One end of the hinge shaft 6 is provided with a limiting head 20. The other end of the hinge shaft 6 is provided with a limiting bolt head 44 and an internal thread cooperating with the limiting bolt head 44. The outer side of the hinge lug 9 is provided with a cover plate 40 cooperating with the hinge shaft 6 and a cover plate limiting groove 43 cooperating with the cover plate 40.

[0040] The roller assembly adopts a three-roller structure, comprising a front roller assembly mounted on the front clamping arm 1 and two rear roller assemblies mounted on the rear clamping arm 2. The front roller assembly and the two rear roller assemblies are vertically mounted. 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 comprises a front roller 11 and a front roller shaft 12. The inside of the front roller 11 is provided with a front roller shaft sleeve 13, and the two ends of the front roller shaft sleeve 13 are connected with the front roller shaft 12 through front roller bearings 14 respectively. The outer diameter of the front roller 11 gradually decreases from both ends to the middle. The two ends of the front roller shaft sleeve 13 are provided with front roller bearing seats 15 matched with the front roller bearings 14, and the two ends of the front roller 11 are provided with front roller bearing seat limiting rings 16 matched with the front roller bearing seats 15. The two ends of the front roller shaft 12 are installed on the front clamping arm 1 through the front limiting seat 17 and the front limiting bolt 18 matched with each other respectively. The top front limiting seat 17 is provided with two front limiting bolt holes 19, and the bottom front limiting seat 17 is provided with one front limiting bolt hole 19. The end of the front roller shaft 12 extends into the front limiting seat 17 and is limited by the front limiting 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 axially limits the front roller shaft 12.

[0042] The rear roller assembly comprises a rear roller 21 and a rear roller shaft 22. The inside of the rear roller 21 is provided with a rear roller shaft sleeve 23, and the two ends of the rear roller shaft sleeve 23 are connected with the rear roller shaft 22 through rear roller bearings 24 respectively. The outer diameter of the rear roller 21 gradually decreases from both ends to the middle. The two ends of the rear roller shaft sleeve 23 are provided with rear roller bearing seats 25 matched with the rear roller bearings 24, and the two ends of the rear roller 21 are provided with rear roller bearing seat limiting rings 26 matched with the rear roller bearing seats 25. The two ends of the rear roller shaft 22 are installed on the rear clamping arm 2 through the rear limiting seat 27 and the rear limiting bolt 28 matched with each other respectively. 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. The middle and bolt head of the rear limiting bolt 28 axially limit the rear roller shaft 22. The rear clamping arm 2 is provided with four decorative pieces 30 matched with the rear limiting seat 27.

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

[0044] The clamping spring adopts a clamping spring structure, and when it is collected (initial state), the front clamping arm and the rear clamping arm clamp the clamping spring, and under the action of the tension of the clamping spring, the front clamping arm and the rear clamping arm are in a clamping state, and the front pressing arm is sleeved outside the front clamping arm, and the rear pressing arm is embedded on the rear clamping arm, and basically belongs to hiding, so that 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, the front pressing arm is turned by a certain angle, the limiting protrusion is limited by the limiting block, the rear pressing arm is turned by a certain angle, the limiting cam head is limited by the cam limiting groove, at this time, the front clamping arm and the rear clamping arm are pressed by slightly pressing, the clamping spring is compressed, the front clamping arm and the rear clamping arm can be opened, the tuning clamp is placed at the specified position of the guitar, then 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, and the front roller abuts against the front side of the guitar and the rear roller abuts against the rear side of the guitar.

[0045] When the pitch needs to be adjusted, the adjusting rod can be adjusted by using a hexagonal screwdriver or a cross screwdriver, in the initial state, the rear end position of the adjusting rod is located at the minimum scale position of the scale, when the adjusting rod is rotated to press the clamping spring, the tension of the clamping spring is increased, so that the front and rear clamping arms are clamped more tightly, when the rear end position of the adjusting rod reaches the maximum scale position of the scale, the tension of the clamping spring is maximum, and the clamping is the tightest, at this time, the tension cannot be continuously increased; when the adjusting rod is rotated to release the clamping spring, the tension of the clamping spring is reduced, so that the front and rear clamping arms are clamped more loosely, until the rear end position of the adjusting rod returns to the minimum scale position of the scale, of course, the adjustment is only fine adjustment, during the adjustment process, once the pitch is accurate, the adjustment can be stopped, then the position of the rear end of the adjusting rod is observed through the observation hole, and the scale at this time is recorded, so that the tuning can be adjusted to the best position only once, and the tuning is not needed to be adjusted every time.

[0046] When the tuning clamp needs to slide, the tuning clamp is adjusted by a finger, and since the width of the two rear rollers arranged side by side is slightly greater 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 only describes the preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A roller type variable clamp with convenient and stable position adjustment, comprising a folding arm assembly and a roller assembly matched with each other, characterized in that: the folding arm assembly adopts a hidden camshaft folding arm, which comprises a front clamping arm, a rear clamping arm, a front pressing arm mounted on the front clamping arm, a rear pressing arm mounted on the rear clamping arm, and a hinge shaft matched with the front clamping arm and the rear clamping arm 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 pressing arm is sleeved outside the front clamping arm when it is retracted, the single-side width of the front pressing arm matches the side width of the front clamping arm, the rear pressing arm is embedded in the rear clamping arm when it is retracted, the top of the front pressing arm is provided with a limiting protrusion, and the top of the rear pressing arm is provided with a limiting cam head; the roller assembly adopts a three-roller structure, which comprises a front roller assembly mounted on the front clamping arm and two rear roller assemblies mounted on the rear clamping arm, the front roller assembly and the two rear roller assemblies are vertically mounted, 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, and the front roller assembly is aligned between the two rear roller assemblies.

2. The roller type pitch adjusting clamp according to claim 1, wherein: the front roller assembly comprises a front roller and a front roller shaft, the inside of the front roller is provided with a front roller shaft sleeve, and the two ends of the front roller shaft sleeve are connected with the front roller shaft through front roller bearings respectively; the outer diameter of the front roller gradually decreases from both ends to the middle, the two ends of the front roller shaft sleeve are provided with front roller bearing seats matched with the front roller bearings, and the two ends of the front roller are provided with front roller bearing seat limiting rings matched with the front roller bearing seats.

3. The roller type variable clamp according to claim 2, wherein: the two ends of the front roller shaft are mounted on the front clamping arm through a matched front limiting seat and a front limiting bolt respectively, the front limiting seat is provided with at least one front limiting bolt hole, the end of the front roller shaft is limited by the front limiting bolt by being inserted into the front limiting seat; the front end of the front limiting bolt is screwed into the front limiting bolt hole, and the bolt head of the front limiting bolt axially limits the front roller shaft.

4. The roller type tuning clamp according to claim 1, wherein: the rear roller assembly comprises a rear roller and a rear roller shaft, the inside of the rear roller is provided with a rear roller shaft sleeve, and the two ends of the rear roller shaft sleeve are connected with the rear roller shaft through rear roller bearings respectively; the outer diameter of the rear roller gradually decreases from both ends to the middle, the two ends of the rear roller shaft sleeve are provided with rear roller bearing seats matched with the rear roller bearings, and the two ends of the rear roller are provided with rear roller bearing seat limiting rings matched with the rear roller bearing seats.

5. The special three-roller structure of the roller-type variable tuning clamp as claimed in claim 4, wherein: the two ends of the rear roller shaft are mounted on the rear clamping arm through a matched rear limiting seat and a rear limiting bolt respectively, the rear limiting seat is provided with a rear limiting bolt hole, the end of the rear roller shaft is limited by the rear limiting bolt by being inserted into the rear limiting seat; the front end of the rear limiting bolt is screwed into the rear limiting bolt hole, and the middle and the bolt head of the rear limiting bolt axially limit the rear roller shaft.

6. The position-adjustable, stable and reliable roller-type variable clamp of claim 5, wherein: The top of the front pressing arm is rotationally connected to the hinge shafts of the front and rear clamping arms through a hinge lug, the top of the rear clamping arm is sleeved outside the top of the front clamping arm, the top of the front pressing arm is sleeved outside 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 block matched with the limiting protrusion; the first damping ring is arranged between the hinge lug and the top of the rear clamping arm, the bottom of the front pressing arm is provided with a limiting sheet, and the bottom of the front clamping arm is provided with a limiting concave matched with the limiting sheet and a limiting protrusion matched with the bottom of the front pressing arm.

7. The position-adjustable and stable roller-type variable clamp according to claim 6, wherein: The upper part of the rear clamping arm is arranged in an inclined manner, the lower part of the rear clamping arm is arranged in a vertical manner, the limiting cam head is rotationally connected to the bent part of the middle part of the rear clamping arm through a cam shaft, and the rear clamping arm is provided with a cam limiting groove matched with the limiting cam head; the rear surface of the rear clamping arm is provided with a rear pressing arm mounting groove matched with 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 a magnetic attraction assembly matched with each other, the two sides of the limiting cam head and the cam shaft connecting part are provided with second damping rings, and the rear clamping arm is provided with a plurality of decorative sheets matched with rear limiting seats.

8. The position-adjustable, stable and reliable roller-type variable clamp according to claim 7, wherein: The two sides of the top of the rear clamping arm are provided with first damping ring limiting grooves matched with the first damping rings, and the two sides of the limiting cam head are provided with second damping ring limiting grooves matched with the second damping rings; the first damping ring and the second damping ring are both made of rubber material.

9. The roller type variable clamp according to claim 6, wherein: One end of the hinge shaft is provided with a limiting head, the other end of the hinge shaft is provided with a limiting bolt head and an internal thread matched with the limiting bolt head, and the outer side of the hinge lug is provided with a cover plate matched with the hinge shaft and a cover plate limiting groove matched with the cover plate.

10. The roller type tuning clamp of claim 1, wherein: One end of the clamping spring is provided with an adjusting rod, the top of the front clamping arm is provided with an adjusting channel matched with the adjusting rod, and the adjusting rod and the adjusting channel are both arranged in a transverse direction; the front side surface of the top of the front clamping arm is provided with an adjusting hole matched with the adjusting channel, the outer side of the adjusting rod is provided with an external thread, the inner side of the adjusting channel is provided with an internal thread matched with the external thread, the rear end of the adjusting rod is fixed on the clamping spring, and the top surface of the front clamping arm is provided with an observation hole for observing the position of the rear end of the adjusting rod and a scale for recording the position of the rear end of the adjusting rod; the front end of the adjusting rod is aligned with the adjusting hole, and the front end of the adjusting rod is an internal hexagonal adjusting end or a slotted screwdriver adjusting end or a cross screwdriver adjusting end.

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