JPH0543960Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a workpiece clamper used for transferring an annular workpiece having teeth on the outer periphery to an accurate position.

(Conventional technology) For example, when forging gears that have teeth on the outer periphery used in automatic transmissions, etc., a workpiece that has been rough-machined in advance is placed in a forged die to accurately form the teeth. It is necessary to match and fit it.

Therefore, when performing automatic forming, etc., a work clamper positions and clamps the roughly machined workpiece at a positioning station, and then a loader moves the workpiece clamper to the forging die and fits the workpiece into the correct position. That's what I do. At this time, the axis of the workpiece is aligned with the axis of the rotary table, and this is used as a reference, and the workpiece is inserted by aligning the axis with the axis of the forging mold.

Conventionally, such work clampers are
There was one shown in Figures 3 and 4.

This work clamper 1 includes a rotatable rotary table 2 provided at a positioning station.
The workpiece W, which has been roughly machined, is clamped after positioning its teeth on the upper surface, and its configuration will be described below.

Rotatable rollers 5 are attached to the clamper body 3 at three locations via a shaft 4. The roller 5
are for rotating the workpiece W placed on the upper surface of the rotary table 2 as the rotary table 2 rotates, and are provided at equal intervals at positions in sliding contact with the inner circumferential surface W1 of the workpiece W.

Further, a holder 7 is attached to the clamper body 3 and is biased toward the rotary table 2 by a coil spring 6, and a rotatable roller 8 that presses against the upper surface of the workpiece W is attached to the outer periphery of the holder 7. It is located in four locations.

A claw member 1 is attached to the clamper body 3 via a pin 9.
0 is rotatably mounted. The claw member 10
A clamp claw 11 that can come into contact with the inner circumferential surface W1 of the workpiece W as it rotates is attached to one end, and a push rod 13 connected to a cylinder device (not shown) via a link 12 is attached to the other end. It is connected to the.

The clamper body 3 is provided with an arm 15 that can be rotated by a fulcrum pin 14.
At the tip of the key member 5, a key member 16 having a shape that can be engaged with the tooth portion W2 on the outer periphery of the workpiece W is attached.

The work clamper 1 configured as described above is attached to a loader (not shown) that can move forward, backward, and up and down.

The workpiece clamper 1 configured in this way is moved above the rotary table 2 by a loader, the roller 5 is brought into sliding contact with the inner circumference W1 of the workpiece W placed on the rotary table 2, and the holder 7 is placed on the upper surface of the workpiece W. The provided roller 8 is brought into pressure contact.
By rotating the rotary table 2 in this state, the workpiece W is rotated by the frictional force on the upper surface of the rotary table 2. When the teeth W2 on the outer periphery of the workpiece W and the teeth of the key member 16 match, the key member 16 moves to the fulcrum pin 14 due to its own weight.
Using this as a fulcrum, it falls down and engages the tooth portion W2 of the workpiece W. In this way, the key member 16 positions the teeth of the tooth portion W2 of the workpiece W in a state where the rotary shaft 2a of the rotary table 2 and the axis of the workpiece W are aligned.

Subsequently, when the push rod 13 is moved to the right in the figure by a cylinder device (not shown), the claw member 10 rotates around the pin 9 (clockwise rotation in the figure).
Then, the clamp claw 11 presses the inner periphery of the work W, and the work W is clamped by the roller 5.

In this way, after the workpiece clamper 1 clamps the workpiece W in the positioned state, it is moved into the forging die by the loader.

(Problem to be solved by the invention) However, the above conventional work clamper 1
However, it had the following problems.

First, there is a machining error in the diameter of the inner circumference of the workpiece W.
Furthermore, due to deformation of the workpiece W, the dimensions vary slightly from workpiece to workpiece. Therefore, it is not easy to set the clearance between the inner circumference of the workpiece W and the roller 5. In other words, if the clearance is too large, the workpiece W will be shaken and the resistance will be large and the workpiece W will not rotate smoothly, and if the clearance is too small, the roller 5 will not be inserted smoothly into the workpiece W. .

Furthermore, when clamping the workpiece W, the clamp claws 11 press the inner circumferential surface W1 of the workpiece W outward due to the large force of the cylinder device, so the workpiece W is displaced in the direction of the pressure, and the rollers 5 cause the rotary table to There is a risk that the axis of the workpiece W aligned with the rotating shaft 2a of No. 2 and the axis of the workpiece W when clamped by the clamp claw 11 do not align with each other, causing a problem that the workpiece cannot be fitted into the forging die. Ta.

The present invention was devised in view of the above problems, and its purpose is to provide a workpiece clamper that can accurately position and clamp a workpiece.

(Means for solving the problems) The means for solving the above problems are explained in the first example.
This will be explained in detail with reference to the drawings and FIG.

The clamper body 18 attached to the loader has a holder 21 with a bearing 19 and a holder 2.
It is rotatably supported by rollers 22 provided at 1. The holder 21 includes a centering guide 24 elastically biased toward the rotary table 2 in order to press the workpiece W against the rotary table 2, and a centering guide 24 that moves along the axis of the holder 21 in accordance with the operation of the cylinder device 33. Movable pin 26
, one end engages with the recess 26a of the movable pin 26,
A claw member 34 is attached that rotates as the movable pin 26 descends and allows a clamp claw 36 provided at the other end to press the inner circumferential surface W1 of the workpiece W.

The clamper body 18 also includes a fulcrum pin 37.
An arm 38 is rotatably attached to the arm 38, and the arm 38 is provided with a key member 39 that can be engaged with the teeth of the workpiece W.

(Function) With the above configuration, first, the centering guide 24 is lowered by the loader with its axis aligned with the axis of the rotary table 2, and the centering guide 24 moves the workpiece W onto the top surface of the rotary table 2. When pressed, the workpiece W rotates smoothly together with the holder 21 due to the frictional force with the upper surface of the rotary table 2 as the rotary table 2 rotates. When the teeth W2 of the workpiece W and the teeth of the key member 39 match, the key member 39 is moved by its own weight to the workpiece W.
The rotation of the workpiece W is stopped by engaging with the teeth W2 of the workpiece W2. In this way, the tooth portion W2 of the workpiece W can be easily positioned.

Subsequently, the movable pin 26 moves, rotates the plurality of claw members 34, and presses the clamp claw 36 provided at the other end against the inner circumferential surface W1 of the workpiece W to clamp the workpiece W.

In this way, the inner circumferential surface W is
By pressing 2, the work W can be reliably clamped without misalignment of the rotation axis of the rotary table 2 and the axis of the work W.

(Example) Next, an example of the present invention will be described based on FIGS. 1 and 2.

A positioning station for the workpiece W is provided near the forging die, and the positioning station includes a rotating shaft 2a connected to a motor (not shown).
A rotary table 2 is provided which can be rotated by. The work clamper 17 of this embodiment is used to position the work W at a positioning station, clamp it, and then move the work W by a loader (not shown) to fit the work W into a forging die.

To explain the structure of the work clamper 17, a holder 21 is attached to the clamper body 18 with a bearing 19 and a circlip 20. A contacting roller 22 is rotatably provided by a pin 23. And rollers 22 provided at three locations
The holder 21 is supported by the bearing 19 so as to be able to rotate smoothly.

A centering guide 24 that is vertically slidable is attached to the holder 21. A coil spring 25 is interposed between the upper surface of the centering guide 24 and the lower part of the holder 21, and the centering guide 24 is biased downward. The centering guide 24 engages with the upper end of the inner circumference of the work W placed on the upper surface of the rotary table 2 and presses it against the rotary table 2. Note that since the outer periphery 24a of the centering guide 24 has a conical shape that becomes larger in diameter toward the upper side, the workpiece W moves along the outer periphery 24a and its axis is aligned with the axis of the centering guide 24.

Further, the holder 21 is provided with a through hole 21a centered on the axis, and a movable pin 26 is provided in the through hole 21a so as to be slidable along the axis. The movable pin 26 is urged upward by a coil spring 28 interposed between the movable pin 26 and a lid member 27 that closes the lower end of the through hole 21a. Furthermore, one end of a crank member 29 rotatably supported by the clamper body 18 is in contact with the upper surface of the movable pin 26, and the other end of the crank member 29 is attached to a push rod 31 via a link 30. . The push rod 31 is biased leftward in the figure by a coil spring 32, and a cylinder device 33 is provided on the left side of the push rod 31, and is in contact with the cylinder rod 33a.
Therefore, the cylinder rod 3 of the cylinder device 33
As 3a expands, the crank member 29 rotates to the right in the figure and lowers the movable pin 26.

A recess 26a is provided on the outer periphery of the movable pin 26 along the circumferential direction, and claw members 34 are provided in the recess 26a at three equally spaced locations along the circumference of the movable pin 26. One end of each is engaged. The claw member 34 is attached to the holder 2.
1 by a pin 35, and rotates as the movable pin 26 descends, so that the clamp claw 36 provided at the other end presses the inner circumferential surface W1 of the workpiece W. It's getting old.

An arm 38 is attached to the clamper main body 18 so as to be rotatable about a pin 37, and a key member 39 having a shape that can be engaged with the teeth w2 of the workpiece W is attached to the arm 38.
Furthermore, a dock 40 is provided at the tip of the arm 38, and a proximity switch 4 is mounted on the base (not shown) of the rotary table 2, facing the dog 40.
1 is provided.

The work clamper 17 is formed with the above structure, and the work clamper 17 is attached to a loader (not shown) so that it can move forward, backward, and up and down.

The operation related to the above configuration will be explained.

First, the work clamper 17 is moved by a loader so that the rotation axis (axis center) of the holder 21 is aligned with the rotation table 2.
2 above the rotary table 2 so that it coincides with the rotation axis (axis center) of the rotary table 2.

Next, the work clamper 1 is loaded by the loader.
7 is lowered, the centering guide 24 comes into contact with the upper end of the inner periphery of the workpiece W placed on the upper surface of the rotary table 2, and the axis of the workpiece W and the rotational axis of the rotary table 2 are aligned. The workpiece W is pressed onto the upper surface of the rotary table 2. Then, when the rotary table 2 is rotated in this state, the work W
The holder 21 is rotated by the frictional force on the upper surface of the rotary table 2.

During the rotation, when the teeth W2 on the outer periphery of the work W and the teeth of the key member 39 match, the key member 39 falls into the teeth W2 of the work W due to its own weight and stops the work W. Also, at this time, the tip of the arm 38 descends and the dock 40 approaches the proximity switch 41, which is detected by the proximity switch 41 and stops the motor of the rotary table 2 to stop rotation.

Next, the cylinder rod 3 of the cylinder device 33
3a is extended, the link 30 is moved to the right in the figure, and the crank member 29 is rotated to the right in the figure, so that the movable pin 26 is lowered against the elastic force of the coil spring 28. As the movable pin 26 descends, the claw members 34 provided at three locations rotate, and the crank claws 36 spread out on the inner peripheral surface W of the workpiece W.
Press 1 to clamp the workpiece W.

In this way, the workpiece W is connected to the shaft center and the tooth portion W
2 position is positioned and clamped.

After that, the loader is the work clamper 1.
7 is moved, and the workpiece W is fitted into a proper position within the forging die.

(Effects of the invention) As explained in detail above, the present invention allows the workpiece to be rotated smoothly as the rotary table rotates, and the teeth of the workpiece can be easily positioned using the key member. Since a plurality of claw members press the workpiece from the inner periphery, it is possible to clamp the workpiece without shifting the reference when fitting it into the forging die.

Therefore, there is no need for clearance adjustment when positioning the workpiece as in the past, and the workpiece can be positioned and clamped easily and accurately, and the possibility of poor fitting into the forging die can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a work clamper that is an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view taken along the - line in FIG. 1, and FIG. 3 is a vertical cross-sectional view of an example of a conventional work clamper. FIG. 4 is a sectional view taken along the - line in FIG. 3. 2...Rotary table, 18...Clamper body, 21...Holder, 24...Centering guide, 26...Movable pin, 34...Claw member, 39
...Key parts.

Claims (1)

[Claim for Utility Model Registration] A holder rotatably attached to a clamper body attached to a loader, and a centering guide attached to the holder that presses an annular workpiece having teeth on the outer periphery against a rotary table. , a movable pin that is movable along the axis of the holder and has a recess formed on its outer periphery; and a movable pin that is rotatably attached to the holder and has one end engaged with the recess of the movable pin, so that the movable pin can be moved. a plurality of claw members whose other ends abut against the inner periphery of the workpiece; a key member provided on the clamper body and engaged with the teeth of the workpiece when the tooth positions coincide with those of the workpiece; A work clamper characterized by comprising: