JPS6243170Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cam device that transmits uniform rotational motion of an input shaft to an output shaft as nonuniform rotational motion.

Conventionally, this type of cam device transmits the constant rotational motion of the input shaft to the camshaft, and the camshaft is equipped with a plurality of plate cams each having a high-speed range and a low-speed range. The plate cam is brought into contact with the rollers of a turret device consisting of a plate and a plurality of rollers, and the rotation of this plate cam transmits inconstant rotational motion to the output shaft fixed to the disk of the turret device.

However, in this conventional cam device, the pressure angle (the angle that the common normal direction of the cam and the turret roller makes with the moving direction of the roller) is ) becomes large, making it impossible for the turret to rotate smoothly, and in the high-speed range of the plate cam, that is, where the distance between the peaks of the cam contour is narrow, the cam undercuts, causing the turret to rotate loosely. It was hot. For this reason, in the past, the cam diameter was increased to prevent the pressure angle from increasing, and when undercutting occurred, the turret PCR (distance from the center of the turret to the center of the roller rotatably supported by the turret) was reduced. things were being done.

The present invention was made in view of the above-mentioned conventional defects, and its purpose is to reduce the pressure angle in the low speed range of the cam, eliminate undercut in the high speed range of the cam, and reduce the rotational speed of the output shaft. To provide a cam device that can freely change the

In other words, while the conventional cam device consisted of a combination of a plate cam and a single turret device, and the process of converting uniform rotational motion to inconstant rotational motion was one step, the present invention uses a plate cam and a single turret device. By combining two turret devices, this conversion process is made into two stages, thereby improving the above-mentioned defects of the conventional method.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 shows a box body of a cam device according to the present invention, and an input shaft 2 extends inside from one side of the box body 1, and both ends of the input shaft 2 are connected to the side wall of the box body 1 and parallel to this side wall. It is rotatably supported by a bracket 3. A portion of the outer end of the input shaft 2 protrudes outward to be connected to constant velocity rotational movement means, and a worm gear 4 is integrally attached to the center thereof. A first output shaft 6 of a first turret device 5 is rotatably supported in a direction perpendicular to the input shaft 2, and a worm wheel 7 is fixed to the lower part of the first output shaft 6. The wheel 7 meshes with the worm gear 4, whereby the constant rotational motion of the input shaft 2 is transmitted to the first output shaft 6 as a decelerated uniform rotational motion.

The first turret device 5 includes three disks 8 fixed to the first output shaft 6 and separated in parallel, and three rollers 9a rotatably disposed between the upper two disks. and three rollers 9b rotatably attached between two lower discs. A camshaft 10 is rotatably supported on the upper and lower walls of the box 1 in parallel with and separate from the first output shaft 6, and this camshaft 10 has two plate cams 11a, 1
1b are separated and fixed in parallel. Each plate cam 11 is a non-stop cam consisting of a tooth-shaped part in a high speed range and a gently curved part in a low speed range, and the upper plate cam 11a
is the upper roller 9a of the first turret device 5.
In addition, the lower plate cam 11b is in contact with the lower roller 9b of the first turret device 5.

A second turret device 12 is arranged at a position symmetrical to the first turret device 5 with the camshaft 10 in between. This second turret device 12
Similarly to the turret device, there are three discs 13 separated and arranged in parallel, three rollers 14a rotatably arranged between the upper two discs, and between the lower two discs. It has three rollers 14b rotatably attached to the disc 13, and a second
The output shaft 15 of is fixed. This second output shaft 15 is rotatably supported by the upper and lower wall plates of the box 1. The upper three rollers 14a of the second turret device 12 are connected to the upper plate cam 11a, and the lower three rollers 14b are connected to the lower plate cam 11b.
is in contact with.

Since the cam device of the present invention is constructed as described above, the uniform rotational motion of the input shaft 2 is transmitted to the first output shaft 6 of the first turret device 5 as uniform rotational motion. Since the rollers 9a and 9b of the first turret device are in contact with the peripheral end surfaces of the plate cams 11a and 11b, when the disc 8 rotates due to the rotation of the first output shaft 6, the rollers 9a and 9b are rotated. At the same time, the plate cams 11a and 11b rotate. Since each plate cam 11 has a contour including a low speed range and a high speed range, the circumferential speed of the plate cam is slow while the low speed range is in contact with the rollers 9a, 9b of the first turret device 5; The circumferential speed of the plate cam increases while the plate cam is in contact with the plate cam in a high-speed range, and the circumferential speed of the plate cam can be freely varied depending on the contour of the plate cam. The plate cams 11a, 11b further include a second
rollers 14a, 14b of the turret device 12;
The disc 13 of the second turret device 12 is rotated by the rotation of the plate cam, thereby causing the second output shaft 15 to rotate at an inconstant speed. That is, the roller 9 of the first turret device 5
Plate cams 11a and 11b in the portions that contact a and 9b
The circumferential speed of the plate cams 11a, 11b is determined by the shape of the plate cams 11a, 11b in the portions that contact the rollers 14a, 14b of the second turret device 12.
The rotation speed of the disk 13 of the second turret device and the second output shaft 15 is determined by the shape of the second turret device 11b. Therefore, in the cam device of the present invention,
First turret device 5 and plate cams 11a, 11b
A first stage speed conversion is performed between the plate cam 11 and
A, 11b and the second turret device 12 perform a second stage speed conversion.

For this reason, conventionally, the pressure angle was large in the low speed range where the distance between the peaks of the cam profile was wide.
In the present invention, by designing the intervals between the peaks of the cam contour to be narrow and slowing down the circumferential speed of the plate cam in those areas, it is possible to reduce the pressure angle and obtain the same displacement as before. In addition, for areas where undercutting has conventionally occurred in high-speed ranges where the spacing between the ridges on the cam profile is narrow, the present invention has been designed with a wide spacing between the ridges on the camshaft to increase the circumferential speed of the plate cam in that area. If we make it faster, we can eliminate the devaluation and obtain the same displacement as before.

As described above, with the cam device of the present invention, not only can a first output shaft of uniform rotational motion and a second output shaft of nonuniform rotational motion be obtained, but also a second output shaft of nonuniform rotational motion can be obtained.
The output shaft rotates smoothly at non-uniform speed, and it is possible to obtain a finely controlled non-uniform rotation output.

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view of a cam device according to an embodiment of the present invention, and FIG. 2 is a central vertical sectional view of the cam device shown in FIG. 2... Input shaft, 4... Worm gear, 5... First turret device, 6... First output shaft, 7...
... Worm wheel, 8, 13... Disc, 9a,
9b, 14a, 14b...Roller, 10...Camshaft, 11a, 11b...Plate cam, 15...Second
output shaft.

Claims (1)

[Scope of utility model registration request] The uniform rotational motion of the input shaft is transmitted via a worm gear and a worm wheel to a first output shaft of a first turret device disposed in a direction orthogonal to the input shaft, and the first turret device is It is composed of a plurality of discs fixed to a first output shaft and a plurality of rollers arranged in multiple stages between the discs, and is rotatable parallel to the first output shaft. A cam shaft is provided, and at least two plate cams are separated and coupled to the cam shaft in parallel, and the plate cam is brought into contact with the roller of the first turret device, and the first plate cam is connected to the cam shaft with the cam shaft in between. A second turret device is disposed opposite to the turret device, and the second turret device is disposed between a plurality of discs and in multiple stages between the discs and abuts the plate cam. A cam device comprising a plurality of rollers and a second output shaft fixed to the disc.