JP2002021976A - Cam mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate free moving of a lever 13 by adjusting the width of a cam so that the cam width agrees with the space between both rollers 14, 15 while the relationship between both rollers and the cam is more tight in the case where the cam 16 is rotated at a gradient than the case where the center line 21 of the cam 16 intersects at right angles each center line of two rollers 14, 15. SOLUTION: Two rollers 14, 15 are rotatably supported on the lever 13 supported on a machine frame 11 through a support shaft 12, and an endless cloud-shaped annular cam 16 is disposed between both rollers 14 and 15. When the annular cam 16 is rotated in the direction of an arrow 17 by power of the central shaft, the lever 13 is rocked depending on the cloud-shaped change of the cam, and the rocking motion is transmitted to a mechanical element through a link 18. The cam width whose both roller contacts to the both sides of the cloud-shaped annular can is adjusted to agree wish the space between the rollers in the whole area of the cloud-shaped annular cam and machined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a cam mechanism as power transmission means.

[0002]

As means for converting the rotational motion of the cam into a linear motion and transmitting it to the machine element, as shown in FIG. 3, a roller 3 of a lever 2 which swings on a support shaft 1 as a fulcrum is conventionally used. There is a cam mechanism that presses against the peripheral surface of the full-circumferential cam 4 by the pressure of a spring and transmits the rotational motion of the full-circular cam 4 to the rod 5 as linear motion, but the curve of the cam peripheral surface 6 changes extremely. In this case, there is a drawback that play occurs in the movement of the lever 2. In this regard, in the case where the roller 8 is engaged with the cam groove 7 in FIG. 4 and the lever 9 is swung by the change of the cam groove 7, it can be said that there is less play in the movement of the lever 9 as compared with the structure of FIG. Since an intentional gap is formed between the cam groove 7 and the roller 8 in order to promote the rotation of the roller 8, there is a problem that the existence of the gap leads to a malfunction of the movement of the lever 9. Was.

[0003]

The present invention provides a cloud-shaped annular cam in which two rollers are supported by a lever that can swing about a support shaft and the two rollers are clamped in order to eliminate play of a lever engaged with the cam. Means for transmitting the rotational movement of the roller to the lever, wherein the width of the cam at both roller contact points with respect to both side surfaces of the cloud-shaped annular cam is adjusted so as to coincide with the distance between the rollers in the entire rotation range of the cloud-shaped annular cam. It is composed. Even when the center line of the annular cam moves at right angles at 90 degrees between the two rollers, or when the center of the annular cam moves inclined with respect to the line connecting the centers of the two rollers,
Since the cam member is IC-processed so that the width of the annular cam coincides with the interval between the two rollers, it is possible to always make contact between the annular cam and the two rollers.

[0004] When the lever is swung by reciprocating the cloud-shaped annular cam, the annular cam does not necessarily have to be endless. Therefore, the annular cam in claim 2 is endless,
Or it is endless.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in FIG. 1, two rollers 1 are mounted on a lever 13 supported on a machine base 11 via a support shaft 12. FIG.
4 and 15 are rotatably supported, and an endless cloud-shaped annular cam 16 is disposed between the rollers 14 and 15. When the annular cam 16 is rotated in the direction of arrow 17 by the power of the central axis, the lever 13 swings due to the change in the cloud shape of the cam, and
The swinging motion is transmitted to the machine element via the link 18. The roller 14 on one side can be displaced with respect to the lever 13 by an adjusting screw 19, and the screw 19 fixes the roller 14 at an arbitrary position.

As shown in FIG. 2, two rollers 14, 1
5 The center line 21 of the cam 16 is 9
When the cam is tilted and rotated as indicated by the imaginary line 16a, the relationship between both rollers and the cam is naturally tighter than in the case where the cam is orthogonal at a 0 degree angle.
The width of the cam is adjusted so that 2 and 23 match the roll interval.

[Brief description of the drawings]

FIG. 1 is an explanatory view of the entire mechanism.

FIG. 2 is an explanatory view of a part of a mechanism.

FIG. 3 is an explanatory view of a conventional example.

FIG. 4 is an explanatory view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 ... Support shaft 13 ... Lever 14, 15 ... Roller 16 ... Cloud-shaped annular cam 18 ... Link 20 ... Roller center line 21 ... Cam center line 22, 23 ... Cam width and roller spacing

Claims (2)

[Claims] 1. A means for supporting two rollers on a lever that can swing about a support shaft as a fulcrum, and transmitting the rotational motion of a cloud-shaped annular cam pinched by the two rollers to the lever, wherein the cloud-shaped annular cam is transmitted to the lever. A cam mechanism in which the width of the cam at both roller contact points with respect to both side surfaces of the cam is adjusted so as to be equal to the distance between both rollers in the entire rotation region of the same annular cam. 2. A means for supporting two rollers on a lever that can swing about a support shaft as a fulcrum and transmitting reciprocating motion of a cloud-shaped annular cam sandwiched between the rollers to the lever, wherein the cloud-shaped annular cam is transmitted to the lever. A cam mechanism in which the width of the cam at both roller contact points with respect to both side surfaces of the cam is adjusted so as to be equal to the distance between the two rollers in the reciprocating range of the same annular cam.