JPH0611437Y2 - Intermittent drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an intermittent drive device.

[Prior Art] Conventionally, in an industrial automatic machine or the like, a cam provided with a rib having a straight portion and a curved portion continuous in a circumferential direction on an outer peripheral portion and a rib forming a cam surface of the cam are engaged with the cam. An intermittent drive device having a turret provided with a plurality of cam followers at predetermined intervals on the circumference is used.

The intermittent rotation drive device will be described below as an example of the intermittent drive device. This intermittent rotation drive device has a turret provided with a plurality of cam followers that engage with the ribs of the cam at equal intervals on the circumference, and one rotation of the cam causes the turret to move at the curved portion that is the feed portion of the cam. The turret is rotated for a rotation time m for indexing only one division, and the turret is stopped for a stationary time s at the linear portion that is the stationary portion of the cam. As a result, this intermittent rotation drive device repeats rotation and stationary of the turret due to continuous rotation of the cam.

Here, in the intermittent rotation driving device, when the turret is stationary, loading work, unloading work and the like are performed in each station of the turret.

[Problems to be Solved by the Invention] By the way, in the above intermittent rotation drive device, the rotation time of the turret is short in order to improve the productivity of the industrial automatic machine or the like using the intermittent rotation drive device. However, it is desirable that the stationary time be long.

However, in the conventional intermittent rotation drive device, when the rotation speed of the cam is increased in order to shorten the rotation time of the turret, the stationary time thereof is also shortened. This is because the ratio of the rotation time of the turret to the stationary time is fixed to a constant value by the ratio of the curved portion and the straight portion of the rib provided on the cam.

Further, it is possible to extremely reduce the ratio of the curved portion to the straight portion of the rib to satisfy the above demand, but the ratio that can be taken is limited due to the problem of the pressure angle.

In addition to the above-described intermittent rotation driving device, a device for causing the turret to intermittently reciprocate is known as the intermittent driving device. This device also has the drawbacks according to the above, and the intermittent drive device in this specification means a generic name of these devices.

An object of the present invention is to reduce the ratio of the rotation time or the reciprocating time of the turret, that is, the moving time to the stationary time thereof in the intermittent drive device including the cam and the turret.

[Means for Solving the Problems] The present invention has a cam having a cam surface composed of a feed portion and a stationary portion, and a cam follower that engages with the cam surface of the cam. In an intermittent drive device having a turret that moves corresponding to the feed part and stands still corresponding to the stationary part, the input shaft is
When rotating within a certain feed angle range during rotation, the intermediate shaft supporting the cam is rotated once, and after the input shaft has passed the feed angle range, the remaining positioning angle range during one rotation is rotated. In order to position the intermediate shaft so that the rotation of the cam is stopped, an intermediate shaft driving device for intermittently driving the intermediate shaft is interposed between the input shaft and the intermediate shaft, and the turret of the turret is fixed by the stationary portion of the cam. The stationary time zone and the stationary time zone of the turret caused by the rotation of the cam stopped by the intermediate shaft drive device are continuously set.

[Operation] According to the present invention, the intermediate shaft drive device causes the intermediate shaft and the cam to rotate once when the input shaft rotates within the feed angle range during one rotation thereof, and the intermediate shaft drive device when the input shaft rotates within the positioning angle range. The shaft and cam are allowed to rest for a rest time α.

Also, when the cam makes one rotation, the cam moves the turret by the moving time m and the stationary part causes the turret to stand still for the stationary time s.

Therefore, in this intermittent drive device, when the turret performs an intermittent movement operation in which the turret repeatedly moves and stops due to continuous rotation of the input shaft, the moving time of the turret per one rotation of the input shaft is m, and the stationary time of the turret is Since the cam is stationary, the time α during which the turret remains stationary and the time s during which the turret remains stationary even if the cam rotates, ie, s + α. Since the moving time of the turret when the intermediate shaft drive is not provided is m and the stationary time is s, the ratio of the moving time of the turret to the stationary time can be reduced according to the present invention.

[Embodiment] FIG. 1 is a sectional view showing an intermittent rotation drive device which is an embodiment of an intermittent drive device according to the present invention, and FIG. 2 is a side view showing the intermediate shaft drive device of FIG.

The intermittent rotation drive device 10 includes a housing 11 and an input shaft 1
2, the intermediate shaft 13 and the output shaft 14 are supported. The input shaft 12 is connected to and driven by a drive shaft (not shown) via a worm wheel 12A fixed to the input shaft 12 and a worm gear 12B meshing with the worm wheel 12A.

Further, the intermittent rotation drive device 10 includes a cam 15 on the intermediate shaft 13.
And the output shaft 14 is provided with a turret 16. The cam 15 is provided with a rib 17 on the outer peripheral portion, in which a curved portion of a straight portion is continuous in the circumferential direction. The turret 16 includes a plurality of cam followers 18 that engage with the ribs 17 of the cam 15.
Are equidistantly arranged on the circumference around the output shaft 14. The turret 16 always holds the rib 17 of the cam 15 between the two cam followers 18. That is, the turret 16
Is moved by one rotation of the cam 15 in correspondence with the curved portion as the feeding portion of the cam 15, and is made stationary by corresponding to the straight portion as the stationary portion of the cam 15.

Further, the intermittent rotation drive device 10 includes an input shaft 12 and an intermediate shaft 1.
An intermediate shaft drive device 19 is interposed between the three. The intermediate shaft drive device 19 includes a pair of parallel cams 20 connected to the input shaft 12 and three turret disks 21 connected to the intermediate shaft 13. Each parallel cam 20 is formed of a circular arc portion and three curved portions, and each of the three parallel cams 20 is arranged at equal intervals on both sides of the center turret disc 21.
It acts on the individual rollers 22 to intermittently drive the intermediate shaft 13.
The rollers 22 arranged on both sides of the central turret disc 21 are alternately arranged. That is, when the input shaft 12 rotates within the constant feed angle range corresponding to the curved portion of the parallel cam 20,
By the feeding action that the curved portion applies to the roller 22, the intermediate shaft 13 supporting the cam 15 makes one rotation (360
When the input shaft 12 rotates within the positioning angle range corresponding to the circular arc portion of the parallel cam 20 after the feed angle range has passed, the intermediate shaft 13 is moved by the positioning action applied to the roller 22 by the circular arc portion. Position it,
The intermediate shaft 13 is arranged so that the rotation of the cam 15 is stopped.
Drive intermittently.

Then, the intermittent rotation drive device 10 includes the stationary time zone of the turret 16 by the straight line portion as the stationary portion of the cam 15 and the cam 15 by the intermediate shaft drive device 19 described above.
The stationary time zone of the turret 16 due to the stationary rotation of the turret 16 is continuously set.

Next, the operation of the above embodiment will be described.

According to the above-described embodiment, the intermediate shaft drive device 19 rotates the intermediate shaft 13 and the cam 15 once when the input shaft 12 rotates within the feed angle range during one rotation, and the input shaft rotates within the positioning angle range. When doing so, the intermediate shaft 13 and the cam 15 are stopped for the rest time α.

Further, when the cam 15 makes one rotation, the cam 15 moves the turret 16 by one by its curved portion.
The turret 16 is rotated for a rotation time m for division and indexing, and the turret 16 is stopped for a rest time s by the straight line portion.

Therefore, in the intermittent rotation drive device 10, when the turret 16 performs each indexing operation in which the turret 16 repeats rotation and stationary by continuous rotation of the input shaft 12, the rotation time of the turret 16 per one rotation of the input shaft is m, The stationary time of 16 is that the turret 16 because the cam 15 is stationary.
The time α during which the turret 16 remains stationary and the time s during which the turret 16 remains stationary even when the cam 15 rotates, ie, s + α. Turret 1 without intermediate shaft drive 19
Since the rotation time of 6 is m and the stationary time is s, the ratio of the rotational time of the turret 16 to the stationary time can be reduced.

In the implementation of the present invention, the intermediate drive device is not limited to the one including the parallel cam 20 and the turret disc 21 as in the above embodiment.

[Advantages of the Invention] As described above, according to the present invention, in the intermittent drive device including the cam and the turret, the ratio of the moving time of the turret to the stationary time can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an intermittent drive device according to the present invention, and FIG. 2 is a side view showing the intermediate shaft drive device of FIG. 10 ... Intermittent drive device, 12 ... Input shaft, 13 ... Intermediate shaft, 14 ... Output shaft, 15 ... Cam, 16 ... Turret, 17 ... Rib, 18 ... Cam follower, 19 ... Intermediate shaft Drive device, 20 ... Parallel cam, 21 ... Turret disk, 22 ... Roller.

Claims (2)

[Scope of utility model registration request] 1. A cam having a cam surface composed of a feed portion and a stationary portion, and a cam follower engaging with the cam surface of the cam, and moving corresponding to the feed portion by one rotation of the cam, In an intermittent drive device having a turret that is stationary corresponding to the stationary portion, when the input shaft rotates within a constant feed angle range during one rotation, the intermediate shaft on which the cam is supported rotates once. The intermediate shaft is intermittently driven so that the intermediate shaft is positioned and the rotation of the cam is stopped when the input shaft passes through the feed angle range and then rotates in the remaining positioning angle range during one rotation. The intermediate shaft drive device between the input shaft and the intermediate shaft, and the stationary time zone of the turret by the stationary part of the cam,
An intermittent drive device characterized in that a turret rest time period resulting from the rotation of the cam being stopped by the intermediate shaft drive device is continuously set. 2. The intermittent drive device according to claim 1 of the utility model registration, wherein the intermediate shaft drive device includes a pair of parallel cams connected to the input shaft, and a turret disk connected to the intermediate shaft. Each of the parallel cams is formed of an arc portion and a curved portion, and acts on a plurality of rollers arranged at equal intervals on the circumference of the turret disk to intermittently drive the intermediate shaft as described above. Intermittent drive device.