JPS5942534Y2 - parallel index scum device - Google Patents

Description

[Detailed description of the invention] This invention is aimed at a parallel index cam device used for intermittent feeding, which further improves the stopping accuracy, and further stabilizes the transmission of torque from the input shaft to the output shaft. This invention relates to an intermittent feeding device that aims to improve rigidity when stationary.

Conventionally, parallel index cam devices using two cams have good stopping accuracy, but depending on the application, the accuracy and stopping rigidity have been considered insufficient.However, according to the method of the present invention, the two cams can be arranged With a single stop restraint cam, stopping accuracy and stop rigidity can be further improved.

In the case of two cams, each cam is in contact with one of the rollers of the spider, so the spider is restrained at two points and torque is transmitted, but with three cams, When using a cam, torque is transmitted to the spider while it is constantly supported at three points, so
The rotation is extremely smooth and reliable.

Conventionally, a parallel index cam device using three cams is known (Japanese Patent Application Laid-Open No. 50-22171), but the three cams in this device are arranged as cams even if they fall down, and the input shaft is Since the allocation is performed three times for one rotation, the angle of the allocation is small, and the pressure angle during parking is large, and the parking rigidity is small. is fixed to the camshaft, and the -assignment is made for one revolution of the input shaft, so the assignment has a large angle,
It also has the characteristics of a smaller pressure angle and larger retention rigidity.

Therefore, in the former case, two of the three cams always come into contact with the follower roller for one revolution of the input shaft, and one cam sometimes does not come into contact with the follower roller, but in this invention, the three cams always make contact with the follower roller. is in constant contact with the follower roller.

For example, in a parallel index cam device using two cams, as shown in FIG.
, 203 are fixed to the input shaft 201, but by rotating the input shaft once in the direction of the solid arrow 209,
This assigns two rotations to the spider 204 fixed to the output shaft.

On the other hand, in the embodiment of this invention shown in Fig. 1, for comparison, the distance between the input shaft and the output shaft, the size of the spider, etc. are all the same as in Fig. 3, and three cams are used. FIG. 3 is a plan view showing the positional relationship between the cam, the spider, and the roller immediately before starting from a stopped state.

In the example shown in FIG. 3, when the input shaft (cam 201) rotates in the direction of arrow 209, the roller 207 is pushed forward by the cam 202, and the spider moves in the direction of arrow 21.
It starts rotating in the direction of 0.

Also, in the stationary state, the assignment is 2 points for the cam and roller.
They are in contact at two points, 14 and 215.

In this case, the point 214 is the center 212 of the roller 206,
This point is on a line connecting the center 211 of the human power shaft 201, and the point 215 is on the line connecting the center 213 of the roller 207 and the center 211 of the input shaft 201.

Spider 204 therefore has two rollers 206 and 20
7 is constrained by points 214 and 215.

That is, the angle formed by the point that restrains the spider is the angle θ1 formed by the line connecting the point 215 and the center 216 of the spider, and the line connecting the point 214 and the center 216 of the spider.

That is, in this invention, the assignment to the camshaft 101 is cam 102103.
The button and the stop restraint cam 104 are fixed at a predetermined angle, and each of the above-mentioned layouts
Rollers 106, 107° 108, 109, 110, 11 of the spider 105 fixed to the output shaft 124 to the 0 periphery
The rotation of each cam is transmitted to the output shaft via the roller.

When using the above cam, the angle at which the spider is stopped is θ1 in Figure 3 and θ2 in Figure 1. The angle θ2 is considerably larger than θ1, and the stopping accuracy is higher than that of the three cams in Figure 1. It is clear that this is significantly better than using the two cams of FIG.

Next, conventional parallel index cam devices are designed so that they are always in contact with the roller at at least one point, so in the case of two cams, they are in contact at two points.

For example, in the conventional example shown in FIG. 3, points 214 and 215 touch each other, and in this invented example shown in FIG. 1, points 118, 119,
They touch at four points, 122 and 123.

With three cams as in this invention, the rotational force is transmitted from the cam to the spider with three points of contact, so you can always expect smooth rotation.

In Fig. 1, the spider rotates once for every revolution of the camshaft. However, the cam can also be rotated three times when the camshaft makes two, three, four, five, six, or eight revolutions. By using two sheets, it is possible to improve the stopping and restraining accuracy and obtain smoother rotation.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of this invention, FIG. 2 is a side view of the same, and FIG. 3 is a plan view of a conventional parallel index cam device. 101.201... Input shaft, 105,204.
...Spider, 102, 103, 202, 20
3...Assignment is cam 104...stay restraint cam, 106°107.108,109,110,1
11,205°206.207.208...Roller, 114°211...Center of input shaft, 1
24...Output shaft, 115.116,120,1
21.212,213... Center of roller, 1
18,119,122゜123.214,215...
...Contact point between roller and cam, 117, 216...
...Spider rotation center.

Claims (1)

[Scope of utility model registration request] In the predetermined layout, a cam and one stationary restraint cam are fixed in parallel to the input shaft, and a spider is fixed to the output shaft parallel to the input shaft, and the three sheets are attached to the spider. Follower rollers are installed in correspondence with the cam so that they are always in contact with the follower roller on the side thereof, and when the stop restraining cam is at its stop position Ki-, two adjacent follower rollers for the cam are installed. A parallel index cam device in which the roller is restrained, and the other two cams are each in contact with one follower roller.