JPH032500Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an intermittent feeding device using a ratchet-type feeding claw, and particularly relates to an intermittent feeding device of the claw feeding type that is improved so that the conveying direction can be easily reversed. This relates to a feeding device.

[Background of the idea]

In a production process, when a large number of workpieces are intermittently conveyed one after another in a fixed direction, a conveyance device using ratchet-type feed claws is constructed.

This type of conveyance device is configured as follows, for example. That is, the work to be conveyed is supported by guide rails so as to slide along a course, and a slider supporting a ratchet pawl is reciprocated along the guide rails.

During the forward stroke, the ratchet pawl hooks the workpiece and pushes it in the transport direction, and during the return stroke, it is rotated to a position that does not interfere with the workpiece and returns to its original position. By repeating the above operations, the workpiece is intermittently sent along the guide rail.

The above-mentioned intermittent feed device using ratchet pawls has advantages such as simple structure, reliable operation, and durability, and is therefore widely used for conveying a large number of small parts.

However, the above-mentioned intermittent feed device using the ratchet pawl has a drawback in that the conveyance direction is constant and cannot be conveyed in the opposite direction.

In the past, it was generally understood that the inability to reverse the conveyance direction was a drawback based on the essential operating principle of the ratchet pawl type intermittent feed device, so it was used in places where there was no need to reverse the conveyance direction. There is. When installing a ratchet claw type transport device in a place where reversing transport is absolutely necessary,
A method is used in which a pair of conveyance devices having different conveyance directions is provided and the conveyance device in any direction is selectively activated.

[Purpose of the invention] This invention was made in view of the above circumstances.
Without sacrificing the advantages of the ratchet claw type intermittent feed device, which has a simple structure, reliable operation, and good durability,
It is an object of the present invention to provide a ratchet claw type intermittent feeding device that can quickly and easily reverse the conveying direction as desired.

[Summary of the idea]

In order to achieve the above object, the intermittent feeding device of the present invention rotatably supports a spline shaft, is provided with a driving means for rotating the spline shaft, and has a spline bearing externally fitted onto the spline shaft. At the same time, at least one pair of ratchet-type feed pawls is attached to the spline bearing, and the pair of feed pawls have opposite feeding directions, and
A feature is that the pair of feed pawls are installed offset in the circumferential direction of the spline bearing.

However, the above-mentioned splines and spline bearings include all types of spline means such as square splines, involute splines, and ball splines. In short, in the present invention, the terms "spline shaft" and "spline bearing" include all combinations of a shaft and a bearing that are locked against rotation about the axis and are slidable in the axial direction. Therefore,
For example, it may be a combination of a square column and a square hole, or a combination of two parallel round bars and two round holes that fit into them.

[Example of idea]

Next, one embodiment of the present invention will be described with reference to FIGS. 1 and 2.

The intermittent feeding device of this example is capable of moving arbitrarily in the direction of arrow a or the direction of arrow b between workpiece 1 (position A) shown by a solid line in FIG. 1 and workpiece 1' (position B) shown by a virtual line. This is an example configured to allow intermittent feeding in the direction.

The works 1, 1' are supported by rail means (not shown) so as to be slidable in the left-right direction in the figure.

A spline shaft 2 is installed parallel to the conveyance direction. A pair of bearings 3 rotatably support the spline shaft 2.

In this embodiment, a ball spline shaft is used as the spline shaft 2 mentioned above.

A driving means 4 and a transmission means 5 are provided so that the spline shaft 2 can be rotated by 180 degrees as desired.

A spline bearing (in this example, a ball spline bearing holder) 6 is fitted onto the spline shaft 2 so as to be slidable in the axial direction and prevented from rotating around the axis. A cylinder 7 is provided to drive the spline bearing 6 back and forth in the directions of arrows a and b. The imaginary line 6' is a spline bearing that is moved in the direction of arrow b.

A pair of ratchet-type feed pawls 8a and 8b are attached to the spline bearing 6.

The ratchet type feed pawls 8a and 8b are members of the same shape and size, and one of the feed pawls 8a is attached upward, and the other feed pawl 8b is attached downward. That is, a pair of ratchet type feed claws 8a, 8b
are opposed to each other at an angle of 180° around the axis of the spline shaft 2.

When implementing the present invention, the pair of feed claws 8a,
8b do not necessarily have to face each other at 180°, but are installed offset by an angle α in the circumferential direction of the spline shaft. In this case, the spline shaft 2
is configured to be able to rotate reciprocatingly at least through an angle α or to be able to rotate without limit in one direction.

One of the pair of ratchet type feed claws 8a is A.
The structure is such that the workpiece 1 at a certain position can be sent in the direction of arrow b, and its details are shown in FIG.

Reference numeral 9 denotes a shaft on which the feed pawl 8a is pivotally connected to the spline bearing 6.

Reference numeral 10 denotes a spring that biases the feed claw 8a in the counterclockwise direction in the figure.

11 is a spring hook pin implanted in the feed claw 8a;
Reference numeral 12 denotes a spring hook pin installed in the spline bearing 6. As shown in this figure, the ratchet type feed pawl 8a is blocked by a spring-loaded pin 12 so that it cannot rotate counterclockwise beyond the illustrated position. Thereby, the feed claw 8a can withstand the reaction force of the workpiece 1 and feed it in the direction of arrow b.

Suppose that the spline bearing 6 moves to the left,
When the feed pawl 8a attempts to push the virtual object 1'' in the direction of arrow a, the feed pawl 8a stretches the spring 10 and rotates clockwise in the figure, thereby escaping from the virtual object 1''. .

The ratchet-type feed pawl 8b shown in FIG. 1 is provided at a position and attitude symmetrical with respect to the point P with respect to the ratchet-type feed pawl 8a.

When the cylinder 7 is extended and the spline bearing 6 is moved to the 6' position shown by the imaginary line, when the drive means 5 is activated and the spline shaft 2 is rotated 180 degrees, the spline bearing 6' is also rotated 180 degrees. However, the ratchet type feed pawl 8b is at the position 8b' shown by the imaginary line, and the workpiece 1' can be fed in the direction of the arrow a.

In the device configured as described above (Fig. 1), when the cylinder 7 is expanded and contracted with the feed claw 8a facing upward and the feed claw 8b facing downward as shown by the solid line, the spline bearing 6 is caused to reciprocate. , the ratchet type feed pawl 8a intermittently feeds the workpiece 1 to the right in the figure.

Further, when the spline shaft 2 is rotated 180 degrees from the above state and the ratchet type feed pawl 8b is directed upward to extend and retract the cylinder 7, the workpiece 1' is intermittently fed to the left in the figure.

[Effect of idea]

As detailed above, when the present invention is applied, the simple structure, reliable operation, and good durability, which are the unique advantages of the ratchet claw type intermittent feeding means, can be easily transported without sacrificing the simple structure, reliable operation, and good durability. This has an excellent practical effect in that the direction can be reversed arbitrarily.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of one embodiment of the present invention, and FIG. 2 is an explanatory diagram of the vicinity of the ratchet type feed pawl in the above embodiment. 1, 1'...Work, 2...Spline shaft, 3
...Bearing, 4...Driving means, 5...Transmission means, 6,
6'...Spline bearing, 7...Cylinder, 8a,
8b...Ratchet type feed pawl, 9...Shaft, 10...
...Spring, 11, 12...Spring hanging pin.

Claims (1)

[Scope of utility model registration request] A spline shaft is rotatably supported, and a drive means for rotating the spline shaft is provided, and a spline bearing is externally fitted to the spline shaft, and at least one pair of ratchet type feeders are provided for the spline bearing. A reversibly operable intermittent feed, characterized in that the pair of feed pawls are configured to have opposite feeding directions, and the pair of feed pawls are installed offset in the circumferential direction of the spline bearing. Device.