JPS596966Y2 - Workpiece gripping device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gripping device for gripping a workpiece and fixing it to a machine tool or the like.

A gripping device (chuck) that secures a workpiece with a complicated shape, such as a crankshaft, to a machine tool such as a lathe positions the workpiece in a predetermined position, and then firmly grips it with a clamper. must be maintained reliably during processing operations.

However, conventional gripping devices have a complicated structure because they are provided with multiple actuating devices such as fluid pressure cylinder devices that move the mechanisms for the above-mentioned multiple operations, corresponding to each individual operation. However, it has the disadvantage that it cannot be gripped smoothly and reliably without deforming the workpiece.

The present invention has been made in view of the above, and an object thereof is to provide a gripping device with a simple structure that can easily control the posture of a workpiece, etc., and can also obtain a strong and stable gripping force.

The present invention will be described in detail below with reference to the drawings.

The drawing shows one embodiment of the present invention, in which the chuck body 1
has a cylindrical shape, and a lid body 3 having a shaft {L2 is fixed to the open end thereof with a plurality of screws 4 (only one is shown in the figure).

Inside the chuck body 1, a disk-shaped movable body 6 having a shaft portion 5 is inserted into the shaft hole 2 of the lid body 3, and between the chuck body 1 and the lid body 3. The installed guide pin 7 is inserted into the guide hole 8 and the chuck body 1
It is provided so as to be movable in the length direction (horizontal direction in FIGS. 2 and 3).

The ticking body 1 has one rotating shaft 9 and two rotating shafts 10 and 10 whose axial directions coincide with the length direction of the chuck body 1, and which are supported by the chuck body 1 and the lid body 3. It is rotatably provided.

Here, two rotating shafts 10. 10 is supported by a bearing 11 and a ball bearing 12 provided on the chuck body 1 and the lid 3 at positions symmetrical with respect to a plane including the center of the chuck body 1. A pinion 13 is provided at the right end in the figure, and a helical driven gear 14 is provided at the root end thereof.

The helical driven gear 14 is connected to the rotating shaft 1 by a sliding key 15.
0, so that free rotation in the circumferential direction with respect to the rotating shaft 10 is restricted, and movement in the axial direction of the rotating shaft 10 is free.

This helical driven gear 14 has a locking groove 16 that opens toward the pinion 13 side, and as described later, when the helical driven gear 14 moves toward the pinion 13 side, the fixing pin 17 fixed to the chuck body 1 is released. When entering the locking groove 16,
It is designed to stop rotation in the circumferential direction.

Further, the rotation shaft 9 is provided such that its distal end side is supported by a bearing 9a fitted to the chuck body 1, and its root end is supported by a ball bearing 18 attached to the lid body 3. It has a positioning lever 19 at its distal end, and a helical driven gear 20 at its root end.

The helical driven gear 20 is attached to the rotation shaft 9 by a sliding key 21, and is prevented from freely rotating in the circumferential direction with respect to the rotation shaft 9, and at the same time is allowed to freely move in the axial direction of the rotation shaft 9, and is prevented from rotating. It moves toward the positioning lever 19 against the elasticity of a return spring 22 installed between the tip side step portion 9b of the shaft 9 and the helical driven gear 20.

In the above description, the pinion 13 is integrally fixed to the rotating shaft 10, and the positioning lever 19 is fitted to the tip of the rotating shaft 9 and fixed by a screw 19a.

On the other hand, the movable body 6 includes two helical drive gears 23.
24 and two wedge shafts 25, 25 are fixed at positions symmetrical with respect to a plane including the center of the movable body 6 in FIG.

One helical drive gear 23 is meshed with one helical driven gear 14 and a helical driven gear 20 disposed near this, and the other helical drive gear 24 is meshed only with the other helical driven gear 14. When the movable body 6 is moved in the longitudinal direction of the chuck body 1, the helical driven gear 14. 14 and the helical driven gear 20 are configured to rotate in the circumferential direction.

In addition, two helical drive gears 23. 24 does not necessarily need to be provided separately, and may be formed as an integral piece.

The wedge shaft 25 has a wedge surface 26 at the right end in FIG. It is being

Further, a guide pin 28 fixed to the chuck body 1 is fitted into a guide groove 27 formed along the axial direction of the wedge shaft 25, and is guided by the guide pin 28 by the movement of the movable body 6 in the axial direction, and the chuck It is configured to be moved relative to the main body 1.

In addition to the above, the chuck body 1 includes a pair of clampers 29.
, 29 and these clampers 29. A fixing member 30 that holds the workpiece W in cooperation with the positioning lever 29, and a positioning stopper 31 that stops the rotating workpiece W when pushed by the positioning lever 19 are provided.

and a pair of clampers 29. 29 has a pressure receiving part 32 and a rack 33, both of which receive pressure from the wedge surface 26 of the wedge shaft 25. The pressure receiving part 32 is opposed to the wedge surface 26 of the wedge shaft 25, and the rack 33 is engaged with the pinion 13. They are arranged facing each other in a straight line and are movable in the width direction perpendicular to the length direction of the chuck body 1.

In addition, a pair of clampers 29. 29 move closer to each other or move away from each other.

Furthermore, the clamper 29 has its pressure receiving part 32 pushed by the wedge surface 26 of the wedge shaft 25 and moves toward the fixing member 30 to grip the workpiece W, but this gripping operation (final tightening) It is set to be performed at the end of the movement of the movable body 6 after the temporary tightening movement of the clamper 29 by the pinion 13.

Although the gripping device according to the present invention constructed as described above is not shown, the lid body 3 is attached to the tip of the main spindle of a lathe, etc., and is attached to a hydraulic cylinder attached to the rear end of the main spindle of the lathe, etc. The piston rod R is used by extending through the main shaft hole to the tip of the main shaft and connected to the shaft portion 5 of the movable body 6, and its operation will be explained below.

The state of the movable body 6 shown by the two-dot chain line in FIG. 2 shows the state before operation. From this state, when the movable body 6 is pushed to the right in FIG. As shown in FIG. 4, the driven gear 14 is prevented from moving to the right by a fixing pin 17, and the helical driven gear 2a is prevented from moving to the right by a return spring 22, so that it is not meshed with them. Helical drive gear 23. As the gear 24 moves, the driven gear 14 and the gear 20 are also rotated.

The above-mentioned rotation of the helical driven gear 14 and the helical driven gear 20 is performed by the rotating shaft 10 and the rotating shaft 9 via the sliding keys 15 and 21.
On the one hand, pinion 1
3 rotates to move the clampers 29, 29 toward the fixed member 30, and the positioning lever 19 rotates on the other hand to push one side Wa of the protrusion of the workpiece W and rotate it.

When the rotation of the helical driven gear 14 progresses and the locking groove 16 comes to the position of the fixing pin 17, the axial fixation of the helical driven gear 14 by the fixing pin 17 is released, so that each helical driven gear 14. 14 is each helical drive gear 23.
Those helical drive gears 23 remain engaged with 24.
, 24.

In this case, since the fixing pin 17 enters the locking groove 16, the helical driven gear 14 does not rotate.

The workpiece W is temporarily tightened by the movement of the clamper 29 by the pinion 13.

Also, the positioning lever 1B rotates and the other side of the workpiece W
When the helical driven gear 20 is completely applied to the positioning stopper 31, the helical driven gear 20 is moved together with one helical drive gear 23 against the elasticity of the return spring 22.

When the movable body 6 continues to move, the wedge surface 2 of the wedge shaft 25 will now move.
6 presses the pressure receiving part 32 of the clamper 29 as shown in FIG. The prepared and temporarily tightened workpiece W is finally tightened to be completely fixed.

In this case, the play (backlash) existing between the pinion 13 and the rack 33 and/or at the sliding key 15 allows the clamper 29 to be moved for final tightening.

To remove the workpiece gripped by the clamper 29, the movable body 6 is moved to the left with respect to the chuck body 1 from the state shown by the solid line in FIGS. 2 and 3.

By this operation, the clamper 29, positioning lever 19,
The helical driven gear 14, helical driven gear 20, etc. move in the opposite direction to the above and return to their original states.

In this case, even after the helical driven gear 14 and the helical driven gear 20 hit the lid body 3, the movable body 6 moves slightly to the left to reverse the helical driven gear 14 and the gear 20.

While the helical driven gear 14 removes the fixing pin 17 from the locking groove 16, its end on the pinion 13 side is stopped by the fixing pin 17.

As explained above, the gripping device of the present invention uses the positioning lever 19 to position the workpiece by moving the movable body 6, and also uses the pinion 13 and rack 33 to position the workpiece.
After temporarily tightening the workpiece by moving the lever 9, the clamper 29 is moved by the wedge shaft 25 to finally tighten the workpiece, so that the posture of the workpiece can be properly and easily controlled. In addition to being able to grip the workpiece correctly and reliably.

Furthermore, since multiple operations for grasping the workpiece are performed in conjunction with the movement of one movable body 6, only one actuating device such as a fluid pressure cylinder device is required to operate the movable body 6, which is different from the conventional device. As such, there is no need to provide a plurality of actuating devices for each individual operation, and there is an advantage that the structure of the device is simplified.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway front view of the gripping device according to the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. 1. , FIG. 3 is a sectional view taken along the line III-III, FIG. 4 is a sectional view showing the relationship between the helical driven gear and the fixed pin before the start of operation,
FIG. 5 is a sectional view taken along the line ■-■ in FIG. 4, and FIG. 6 is a front view showing the positioning state of the workpiece. 1... Chuck body, 6... Movable body,
9...Rotation axis, 10...Rotation axis, 13
...Pinion, 14...Helical driven gear, 15...Sliding key, 16...Latching groove, 11...Fixing pin, 19... Positioning lever, 20... Helical driven gear, 2
1... Sliding key, 23, 24... Helical drive gear, 25... Wedge shaft, 29...
... Clamper 32 ... Pressure receiving part, 33 ...
・Rack, W... Workpiece.

Claims (1)

[Scope of utility model registration request] Chuck body 1 and helical drive gear 23. 24 and is attached to the chuck body 1 so as to be movable in the length direction of the chuck body 1, and a movable body 6 is rotatably attached to the chuck body 1 with the axial direction matching the moving direction of the movable body 6. The free rotation in the circumferential direction is restricted by the rotation shaft 9 and the sliding key 21, and the rotation shaft 9 is free to move in the longitudinal direction, and the helical drive gear 23.
24 and attached to the rotation shaft 9, the helical driven gear 20 is fixed to the rotation shaft 9 and rotates by the moving force of the movable body 6 at the beginning of the movement of the movable body 6, and the rotation a positioning lever 19 that rotates via the shaft 9 to position the workpiece W; and a rotating shaft that has a pinion 13 and is rotatably attached to the chuck body 1 with its axial direction matching the moving direction of the movable body 6. 10 and a locking groove 16, the free rotation in the circumferential direction is restricted by the sliding key 15, and the rotation shaft 10 is free to move in the longitudinal direction, and is engaged with the helical drive gears 23 and 24. The pinion 1 has a helical driven gear 14 attached to the rotating shaft 10, a pressure receiving part 32, and a rack 33.
A clamper 29 is movably provided on the chuck body 1 with the rack 33 engaged with the clamper 29, and a clamper 29 is fixed to the chuck body 1 and stops the movement of the helical driven gear 14 at the beginning of the movement of the movable body 6. By rotating the helical driven gear 14 with a moving force of The fixed pin 17 is attached to the movable body 6 and the pressure receiving part 3 of the clamper 29 is attached at the end of the movement of the movable body 6.
2. A workpiece gripping device comprising: a wedge shaft 25 for fully tightening the workpiece W by pressing the wedge shaft 25;