JPH0212070Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotary intermittent conveyance device for loading workpieces. In particular, the present invention relates to a rotary intermittent conveyance device in which a hand can be opened and closed by rotating a single cam. In the prior art, a rotary intermittent conveyance device such as a general index mechanism generally conveys a workpiece to each work station through intermittent rotation, and performs tasks such as grasping and releasing the workpiece at each work station. The operation is performed using an independent mechanism separate from the above-mentioned intermittent rotation drive means. An example of this is
A device using a cam mechanism as shown in Japanese Patent No. 11990 is known. In this case, the lifting cam, the pivoting cam, and the cam for clamping or opening the chuck have a predetermined profile and are uniquely shaped so that the hand can operate independently at each station. Therefore, if there are multiple hands, as many cams as there are required.

However, if there are a plurality of cams as described above, the length of the cam increases accordingly, and the adjustment of each cam becomes difficult.

The present invention was developed in view of the above-mentioned problems, and the technical problem is to provide a single cam with a plurality of cam parts and effectively rotate the cam. This involves chuckling or opening the workpiece, as well as handling it.

Hereinafter, one embodiment of the present invention will be described based on the drawings. FIG. 1 is a plan view of the rotary intermittent conveyance device of the present invention, and FIG. 2 is a side view.

In FIGS. 1 and 2, reference numeral 1 denotes an arm indexing drive section, and this arm indexing drive section 1 intermittently transports an arm 2 and a hand 3 to each station.

At this time, the cam 5 is also rotated by the same angle at the same time, but in the next step, the cam drive device 6 driven by the motor 7 causes the cam 5 to return by the forward angle.

By repeating the above operation, the workpiece at work station A is chucked by hand 3 and transported to work station B, and in the next operation, the cam is reversed by the forward angle and opened. Placed at work station. Further, the workpieces at work stations B, C, and D are similarly transported to the next workstation, and the hand that holds the workpieces operates according to the profile of the cam by reversing the cam.

FIG. 3 is a sectional view of the cam drive device side of the rotary intermittent conveyance device of the present invention. In Figure 3, the second
The arm indexing drive 1 shown in the figure is located on the lower side (not shown), and the drive shaft of the arm indexing drive 1 is fitted into the first clutch 17.

Next, in the cam drive device 6 shown in FIG. 2, a camshaft 9 is rotatably supported on a frame 8 to which a motor 7 is attached, and a camshaft clutch 10 is attached to the lower end of the camshaft 9 in a fitted state. It is being camshaft 9
A pulley 11 is provided near the upper end, and a motor 7 is connected via this pulley 11 and a timing belt 12.
It is connected to an output pulley 14 attached to an output shaft 13 of. A rod 4 having a roller 15 at one end is in contact with the cam 5.

The second clutch 10 is configured so that the cam 5 can be rotated only in the clockwise direction by the rotation of the camshaft 9 (counterclockwise direction is free rotation).

The angle of the cam 5 in the clockwise direction is determined by a limit switch attached to a flat plate below the pulley and a cam connected to the limit switch in FIG. Further, the first clutch 17 is configured to be able to rotate the cam 5 only in the counterclockwise direction together with the hand. (Clockwise direction is free rotation). Although the frame 8 is not shown, it is fixed so as not to rotate.

On the other hand, the cam 5 is connected to the rod 4 as shown in FIG.
It is composed of a single plate having a profile formed so that the rollers 15 of the rollers 15 are located at independent predetermined positions. Therefore, corresponding to the number n of hands 3, from the rotation center line of the cam 5,
Cam portions 16 are formed in a range of 360°/n. The cam portion 16 is configured to operate by rotating the rod through a 360°/n angle in the normal direction and then in the reverse direction, thereby creating a rod movement formed by a conventional cam profile.

Next, the operation of the rotary intermittent conveyance device of the present invention will be explained.

In FIG. 1, the arm 2 is moved from A to B by the indexing mechanism (for example, Geneva mechanism) of the arm indexing drive unit 1.
→C→D each operating station is rotated intermittently.

At each of the operating stations A, B, C, and D, each hand 3 performs a separate operation.

For example, work station A checks hand 3, and work station B checks hand 3.
Open and check after a set time.
Then, work station C performs chucking and opening at a different opening time from work station B, and work station D opens what was being chucked. This is because the cam 5 is rotated forward by 360°/n degrees by the arm indexing drive section 1 and the cam drive device 6 via the dedicated first and second clutches 10 and 17, and then reversed by the same angle.
The hand can be operated according to the cam profile. Now, as shown by the two-dot chain line in FIG. From the state in which the hand 3 is opened while the roller 15 is supported by the large diameter profile of the cam part of the cam 5 at the D work station where the workpiece is gripped and the hand 3 is opened, each arm 2 is Rotate 90 degrees counterclockwise on the diagram to move from A to B, B to C, and C to D.
, D to A between each work station. At this time, the cam 5 is rotated 90 degrees counterclockwise by the driving force of the arm indexing drive section 1 via the first clutch 17 shown in FIG. Become. Next, the motor 7 is driven to rotate the cam 5 by 90 degrees clockwise in the figure.
At this time, the first clutch 17 is idle and the driving force of the motor 7 is transferred to the cam 5 via the second clutch 10.
, and move the rod 4 to chuck or open the hand. Due to the rotation of the cam 5, each roller 15 facing the profile of each part of the cam 5 sends a chuck operation to each hand 3 via the rod 4. A predetermined work is carried out at each work station by opening and chucking the workpiece at the station, and by opening the workpiece at the D work station.

Counterclockwise direction of the workpiece indexing drive unit 1 mentioned above
One cycle of work is completed by repeating the combination of 90° rotation and 90° clockwise rotation of the cam 5 four times, and each work station is This completes the machining cycle.

As explained above, the rotary intermittent conveyance device of the present invention can use only one cam, and
Since the cam profile can have various functions within the range of 360°/n, there is no need to arrange various cam rows according to the number of arms, and the structure can be simplified. Multiple and precise actuation controls can be performed by a single cam, depending on the profile over the 360°/n range.

Moreover, the setting shape of the cam can be changed very easily and accurately by changing one cam.

Furthermore, by rotating the cam in the opposite direction by an angle of 360°/n using the cam drive device, the hand can be opened and closed, thereby preventing malfunctions.

Moreover, according to the present invention, since the mechanism for driving the cam is simplified, the entire device can be made smaller and lower in cost. It can also be easily replaced without reducing its functionality.

[Brief explanation of drawings]

Fig. 1 is a plan view of the rotary intermittent conveyance device of the present invention, Fig. 2 is a front view of the same, Fig. 3 is a sectional view of main parts of the rotary intermittent conveyance device of the present invention, and Fig. 4 is a plan view of the cam. It is. 1...Arm index drive unit, 2...Arm, 3...
...Hand, 4...Rod, 5...Cam, 6...Cam drive device, 7...Motor, 8...Frame, 9
...Camshaft, 10...Second clutch, 11...
Pulley, 12... Timing belt, 13... Output shaft, 14... Output pulley, 15... Roller, 1
6...cam section, 17...first clutch.

Claims (1)

[Claims for Utility Model Registration] A hand 3 that is attached to and rotates the drive shaft of an arm indexing drive unit 1 that is driven intermittently at an angle of 360°/n, and a rod that opens and closes the n hands 3. 4. A cam 5 for operating the rod 4 according to a profile within a range of 360°/n, which is fixed to the drive shaft and can rotate the cam 5 only in the same direction as the rotation direction of the drive shaft. a first clutch 17; a second clutch 1 capable of rotating the cam 5 only in the direction opposite to the rotational direction of the drive shaft;
0 and the second clutch 10, the cam drive device drives the cam 5 at an angle of 360°/n in a direction opposite to the rotational direction of the drive shaft.