Driving structure of cam

Abstract

The utility model provides a cam driving structure which comprises a first cam and a second cam which are coaxially installed, and further comprises a first driving arm driven by the first cam in a rolling mode and a second driving arm driven by the second cam in a rolling mode, one end of the first driving arm and one end of the second driving arm are connected to the same rotating shaft, the first driving arm is a fixed arm, and the second driving arm is a movable arm. The second driving arm is adjustably arranged on the first driving arm, an adjusting structure capable of adjusting the matching position of the second driving arm to be tightly attached to the second cam is arranged between the first driving arm and the second driving arm, and at least one fixing bolt used for fixing is further arranged on the second driving arm. When the second driving arm is adjusted, the rotating pivot is the rotating shaft, the rotating shaft is subjected to finish machining, tolerance is small, and the matching position of the second driving arm is not prone to deviation.

Description

Technical Field

[0001] The utility model relates to the technical field of embroidery machines, in particular to a driving structure of a cam. Background Art

[0002] A driving structure of a cam is disclosed in the prior art, which includes a first driving arm and a second driving arm mounted on a transmission rod. An elastic body for driving the first driving arm and the second driving arm to approach corresponding cams is provided on the first driving arm or / and the second driving arm. The first driving arm is a fixed driving arm integrated with the transmission rod, and the second driving arm is detachably mounted on the transmission rod through two bolts. After installing one bolt, the elastic body pushes the second driving arm to make the first driving arm approach the first cam and the second driving arm approach the second cam. After debugging, the second driving arm is fixed to the transmission rod through the other bolt.

[0003] This patent uses the elastic force of a spring to adjust the position of the second driving arm to make the second driving arm approach the second cam. The method is to first fix one bolt, and the second driving arm will rotate with the bolt as a fulcrum. After adjustment, the second bolt is fixed. Since the processing of bolts and screw holes often adopts a rough machining method with a large tolerance, when the second driving arm is adjusted, the rotation fulcrum may deviate, resulting in a position deviation of the contact point between the roller provided on the second driving arm and the second cam.

[0004] In the prior art, the first and second cams are pre-processed. The first cam is in contact and cooperation with the first roller on the first driving arm, and the second cam is in contact and cooperation with the second roller on the second driving arm. The change in the position of the contact point between the second roller and the second cam, that is, the change in the force application point of the second roller, requires the positions of the contact points between the first and second rollers and the cams to correspond. If the position of the force application point changes and the first and second driving arms are tightly held against the corresponding cams again, the cams are likely to get stuck when rotating.

[0005] In addition, with use, wear will occur at the mating parts of the first and second cams and the first and second driving arms, resulting in a reduction in the mating accuracy. Summary of the Invention

[0006] In order to solve the problems of the above prior art, the utility model provides a driving structure of a cam, which can adjust the driving arm to closely adhere to the cam, and the rotation fulcrum will not deviate during adjustment, and it is not easy to hinder the rotation of the cam.

[0007] The technical solution adopted is as follows:

[0008] A driving structure of a cam, comprising a first cam and a second cam coaxially installed, further comprising a first driving arm driven by the first cam to roll and a second driving arm driven by the second cam to roll. One ends of the first and second driving arms are connected to the same rotating shaft. The first driving arm is a fixed arm, and the second driving arm is adjustably arranged on the first driving arm. An adjusting structure is arranged between the first driving arm and the second driving arm to make the mating part of the second driving arm closely adhere to the second cam. At least one fixing bolt for fixing is further arranged on the second driving arm.

[0009] Furthermore, a first roller cooperating with the first cam is arranged on the first driving arm; a second roller cooperating with the second cam is arranged on the second driving arm.

[0010] Furthermore, the adjusting structure comprises a driving compression spring arranged between the first driving arm and the second driving arm to make the mating part of the second driving arm closely adhere to the second cam.

[0011] Furthermore, the adjusting structure further comprises an adjusting pin arranged on the second driving arm, and the driving compression spring is matched with the adjusting pin.

[0012] Furthermore, the adjusting structure further comprises an adjusting bolt arranged on the first driving arm and capable of driving the driving compression spring to push the mating part of the second driving arm to closely adhere to the second cam.

[0013] Furthermore, there are two fixing bolts, including a first fixing bolt and a second fixing bolt; they are respectively arranged on both sides of the adjusting pin.

[0014] Furthermore, a first connecting hole for the first fixing bolt to pass through and a second connecting hole for the second fixing bolt to pass through are arranged on the first driving arm or / and the second driving arm.

[0015] Furthermore, a mounting hole for the adjusting pin to pass through is arranged on the first driving arm.

[0016] Compared with the prior art, the beneficial effects produced by the present utility model are as follows:

[0017] The present utility model provides a driving structure for a cam, which includes a first driving arm and a first roller cooperating with a first cam, and a second driving arm and a second roller cooperating with a second cam. The second driving arm is adjustably disposed on the first driving arm. Between the first and second driving arms, there are first and second connecting parts that make the second roller on the second driving arm closely adhere to the second cam. One ends of the first and second driving arms are connected to a rotating shaft. Usually, the connections between the rotating shaft and the first and second driving arms are all precision machined and can be used as a reference. When adjusting the second driving arm, the rotation fulcrum is the center of the rotating shaft, and the position of the rotation fulcrum remains unchanged. The contact points of the first roller and the second roller with the corresponding cams correspond to each other, and there will be no jamming phenomenon. A triangular positional relationship is formed between the rotation fulcrum and the centers of the first and second rollers, which helps to evenly distribute the force and reduce the deformation and damage of the structure. After setting the adjustment structure, it is convenient to adjust the mating part provided on the second driving arm to closely adhere to the second cam, ensuring the long-term cooperation precision between the first cam, the second cam, the first driving arm, and the second driving arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present utility model from one angle;

[0019] Figure 2 is a perspective view of one side of the present utility model;

[0020] Figure 3 is a perspective view of another side of the present utility model;

[0021] Figure 4 is a schematic diagram of the overall structure of the present utility model from another angle;

[0022] Wherein, the first cam 1, the second cam 2, the first driving arm 3, the first roller 301, the second driving arm 4, the second roller 401, the adjustment structure 5, the adjustment pin 501, the driving pressure spring 502, the adjustment bolt 503, the rotation fulcrum 6, the first fixing bolt, the second fixing bolt, the mounting hole 7, the first connection hole 8, and the second connection hole 9. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following further describes the present utility model with reference to specific embodiments.

[0024] Reference Figures 1-4, A driving structure of a cam, including a first cam 1 and a second cam 2 coaxially installed, and further including a first driving arm 3 driven to roll by the first cam 1 and a second driving arm 4 driven to roll by the second cam 2. One ends of the first and second driving arms are connected to the same rotating shaft. The first driving arm 3 is a fixed arm, and the second driving arm 4 is adjustably arranged on the first driving arm 3. An adjusting structure 5 for adjusting the mating portion of the second driving arm to closely adhere to the second cam is provided between the first driving arm 3 and the second driving arm 4. At least one fixing bolt for fixing is further provided on the second driving arm 4. The mating portion can be a convex portion that mates with the corresponding cam.

[0025] A first roller 301 that mates with the first cam is provided on the first driving arm 3; a second roller 401 that mates with the second cam is provided on the second driving arm 4. The first and second rollers can be used to replace the mating portion to mate with the corresponding cam.

[0026] When the second driving arm 4 is adjusted, with the rotating shaft as the rotation fulcrum 6, the connection holes of the first and second driving arms connected to the rotating shaft are all finely processed, with a smaller tolerance and high precision. When the position of the second driving arm 4 is adjusted, the rotation fulcrum remains unchanged, and the position of the contact point between the second roller 401 and the second cam 2 remains unchanged, and it is not easy to jam.

[0027] The rotation fulcrum, the center point of the first roller, and the center point of the second roller are in a triangular positional relationship. The two force application points and the rotation point in the triangular structure form a stable force transmission path. When external forces on the first cam and the second cam act on this triangular structure, this triangular layout can effectively transmit the force to the support point, thereby reducing the stress concentration degree of the structure and increasing the stability of the structure. Since the two force application points and the rotation point are in a triangular positional relationship, this layout helps to evenly distribute the force and reduce the deformation and damage of the structure.

[0028] The adjusting structure 5 includes a driving pressure spring 502 provided between the first driving arm 3 and the second driving arm 4 to adjust the mating portion of the second driving arm to closely adhere to the second cam. When in use, the second driving arm can be adjusted by the driving pressure spring 502 provided between the first and second driving arms. This spring can be a torsion spring installed on the rotating shaft, a pulling spring that pulls the mating portion of the second driving arm to closely adhere to the second cam, or a compression spring that pushes the mating portion of the second driving arm to closely adhere to the second cam.

[0029] For the convenience of production, processing, installation and adjustment, as an option in this embodiment, the adjusting structure 5 further includes an adjusting pin 501 provided on the second driving arm 4, and the driving compression spring 502 is matched with the adjusting pin 501. The adjusting structure 5 further includes an adjusting bolt 503 provided on the first driving arm 3, which can drive the driving compression spring 502 to push the mating portion provided on the second driving arm to closely adhere to the second cam 501. The driving compression spring 502 can be directly provided to drive the second roller on the second driving arm to closely adhere to the second cam. After adjustment, the second driving arm 4 is fixed to the first driving arm 3 through a fixing bolt.

[0030] Setting the adjusting bolt 503 has greater adjustability than setting a single driving compression spring 502. By rotating the adjusting bolt 503, the adjusting pin 501 can be driven to move, thereby driving the second driving arm 4 to rotate. After adjustment, it is fixed through a fixing bolt.

[0031] There are two fixing bolts, including a first fixing bolt and a second fixing bolt (not shown in the figure), which are respectively provided on both sides of the adjusting pin 501. Setting two fixing bolts on the second driving arm makes the connection between the second driving arm and the first driving arm closer and the fixing effect better.

[0032] A first connection hole 8 for the first fixing bolt 6 to pass through is provided on the first driving arm 3 or / and the second driving arm 4; a second connection hole 9 for the second fixing bolt 7 to pass through. Preferably, through holes are provided on both the first and second driving arms.

[0033] An installation hole 10 for the adjusting pin to pass through is provided on the first driving arm 3. The installation hole 10 is slightly larger than the adjusting pin, leaving enough moving range for the adjusting pin.

[0034] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A cam driving structure, comprising a first cam (1) and a second cam (2) coaxially mounted, and further comprising a first driving arm (3) driven by the first cam (1) in a rolling manner, and a second driving arm (4) driven by the second cam (2) in a rolling manner, characterized in that: One end of the first and second driving arms are connected to the same rotating shaft, the first driving arm (3) is a fixed arm, the second driving arm (4) is adjustably arranged on the first driving arm (3), an adjusting structure (5) is arranged between the first driving arm (3) and the second driving arm (4) so ​​that the fitting part of the second driving arm can be adjusted to be close to the second cam, and the second driving arm (4) is also provided with at least one fixing bolt for fixing.

2. The cam driving structure according to claim 1, characterized in that: The first driving arm (3) is provided with a first roller (301) cooperating with the first cam; the second driving arm (4) is provided with a second roller (401) cooperating with the second cam.

3. The cam driving structure according to claim 1, characterized in that: The adjustment structure (5) comprises a driving pressure spring (502) arranged between the first driving arm (3) and the second driving arm (4) and adjusting the fitting position of the second driving arm to be close to the second cam.

4. The cam driving structure according to claim 3, characterized in that: The adjustment structure (5) further comprises an adjustment pin (501) provided on the second driving arm (4), and the driving pressure spring (502) cooperates with the adjustment pin (501).

5. The cam driving structure according to claim 3 or 4, characterized in that: The adjustment structure (5) further comprises an adjustment bolt (503) disposed on the first driving arm (3) and capable of driving the pressure spring (502) to push the second driving arm to be in close contact with the second cam (501) at the matching position.

6. The cam driving structure according to claim 1, characterized in that: There are two fixing bolts, including a first fixing bolt and a second fixing bolt, which are respectively arranged on both sides of the adjusting pin (501).

7. The cam driving structure according to claim 6, characterized in that: The first driving arm (3) and / or the second driving arm (4) are provided with a first connecting hole (8) for the first fixing bolt to pass through, and a second connecting hole (9) for the second fixing bolt to pass through.

8. The cam driving structure according to claim 1, characterized in that: The first driving arm (3) is provided with a mounting hole (7) for the adjusting pin to pass through.

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