JPH0123684Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> This invention is used in machine tools that set the chuck pawl of a rotary chuck whose stopping position is not determined at the end of cutting to a predetermined position when restarting. This invention relates to a starting position setting device for a rotary chuck.

<Conventional technology> When using a machine tool to cut irregularly shaped materials such as hexagonal materials, forged products, and forged products, conventionally these workpieces are transported to a predetermined location using an autoloader or parts feeder, and then, Although it is automatically attached to a rotary chuck by a robot or an appropriate manipulator, the workpiece must be chucked in a normal state regardless of its shape.
Therefore, these workpieces are aligned in a predetermined direction and transported by an autoloader, etc., but since the rotary chuck of the machine tool is not sure where it will stop at the end of the cutting process, it is necessary to change the rotary chuck when restarting the machine tool. It is necessary to correct the orientation and complete the delivery of the processed material that has been conveyed in the orientation. That is, the restart rotary chuck must always be in a fixed position where it can chuck the workpiece.

For this reason, conventional machine tools are equipped with a rotary chuck stop position detector, and when the cutting process is finished,
A method has been adopted in which, while rotating the rotary chuck at a low speed, the detector corrects the stopping position of the rotary chuck and applies the brake.

<Problems to be solved by the invention> However, conventional devices use expensive position detectors and have to rely on numerical control mechanisms, making them expensive and the mechanism of the device itself complicated. There was a problem.

<Means for solving the problems> The present invention was made with the aim of solving the problems associated with the high cost and complicated mechanism of the conventional equipment mentioned above. By rotating the rotary chuck clockwise or counterclockwise using two rods that move forward and backward with the stroke of , the rotary chuck can be set at a predetermined position for transferring the workpiece.

<Embodiment> Figures 1 and 2 show one embodiment of the present invention, in which 1 is a rotary chuck of a machine tool, for example, a lathe, and 2, 3, and 4 are installed in front of the rotary chuck 1. 5 is a processed material chucked by three chuck claws 2, 3, and 4;
Reference numerals 6 and 7 are forward and backward rods, and 8 and 9 are air cylinders that drive the forward and backward rods.

The reciprocating rods 6 and 7 are connected to the rotary chuck 1.
At a position symmetrically shifted in the radial direction from the rotation center of
perpendicular to the axis of the chuck, and
The chuck pawls 2, 3, 4 are provided opposite to the turning loci of the chuck pawls 2, 3, 4 with a time difference.
When the advance/retreat rods 6 and 7 advance, the chuck pawls are pressed in accordance with their strokes, thereby rotating the rotary chuck 1 by a required angle. There is.

Although the rotary chuck 1 shown above has three chuck pawls, it may be a four-jaw chuck, and the reciprocating rods 6 and 7 for pressing and rotating the rotary chuck 1 are directly connected to the piston rods of the air cylinders 8 and 9. However, the piston rod and the reciprocating rod may be connected by an appropriate connection mechanism such as a link mechanism. Of course, this driving means is not limited to an air cylinder, but may also be an oil cylinder, or may be a mechanical means such as a cam mechanism as long as the stroke accuracy is high, or a driving means such as a stepping motor and a cam. There are no limitations to the means for activating the advance/retreat rod, such as the combined use of.

<Function> In Fig. 2, assuming that the orientation of the workpiece 5 indicated by the solid line is normal, the chuck claws 2, 3, and 4 of the rotary chuck 1 that chucks it are in the position indicated by the dashed-dotted line at the end of the previous cutting. Assume that it has stopped.

In this case, since the chuck pawls 2 and 4 face the sides of the reciprocating rods 6 and 7, when the retracting rod 6 advances, the chuck pawl 2 is pressed in accordance with the stroke of the retracting rod. At this time,
It is assumed that the rotary chuck 1 rotates clockwise until the reciprocating rod 6 reaches the position shown by the three-dot chain line in FIG.

Next, the advancing/retracting rod 6 moves backward, and conversely, the advancing/retracting rod 7 moves forward, and the rotary chuck 1 is rotated counterclockwise until the chuck pawl 4 reaches the direction shown in Figure 2, corresponding to the stroke of the advancing/retracting rod. let As a result, the chuck pawl 2 reaches the preset position shown by the solid line in the same figure, regardless of the advancing and retracting positions of the rod 6, and the position of the remaining chuck 3 is determined accordingly, and all chuck pawls 2, 3, and 4 are machined. It is set in a position to receive the material 5.

Furthermore, in FIG. 2 above, if the chuck pawls 2, 3, and 4 stop at the position indicated by the two-dot chain line at the end of cutting, the chuck pawl 2 is in a position where the tip of the advance/retreat rod 6 does not come into contact with it. Even if the chuck claw 2 advances, the chuck claw 2 is not subjected to its pressing action.Next, when the advancing/retracting rod 7 advances, the side surface of the chuck claw 4 is on the path of the rod 7, so the advancement of the rod 7 causes Rotating chuck 1
rotates counterclockwise in the figure. Since the stroke of the advancing/retracting rod 7 is such that each chuck pawl moves to the position of the chuck pawl 4 shown by the solid line in FIG. Ru.

In other words, no matter what direction the rotary chuck 1 is in, the two reciprocating rods 6 and 7, which operate with a time difference, rotate the rotary chuck 1 clockwise or counterclockwise and activate the chuck pawls 2, 3, and 4. Set to position.

Although the strokes of the forward and backward rods 6 and 7 are changed in the explanation of the above operation, the stroke of the forward and backward rod 6 may be made the same as the stroke of the forward and backward rod 7.

When the starting position of the rotary chuck 1 is set as described above, the chuck claws 2, 3, 4 can be easily positioned to match the cross-sectional shape of the workpiece 5.

<Effects of the invention> According to the rotary chuck starting position setting device of the present invention, the direction of the chuck pawl can be determined simply by operating the two advancing/retracting rods with the desired stroke, making it possible to modify the machine tool body. There is an advantage that the starting position of the chuck pawl can be corrected at low cost without the need for a special position detector. Furthermore, since the structure is less complex than conventional devices, the frequency of failures is extremely low, and stable and highly reliable performance can be obtained from beginning to end. Furthermore, since the movement of the advancing and retracting rods can be visually observed,
It is easy to check the operation of the rod, and malfunctions can be completely eliminated by appropriately correcting the fixing position of the drive source such as the air cylinder.

[Brief explanation of the drawing]

The drawings show one embodiment of the device according to the present invention, and FIG. 1 is a schematic perspective view, and FIG. 2 is a front view for explaining the operation. In the figure, 1... rotary chuck of a machine tool, 2,
3, 4...chuck claw, 5...processed material, 6,7...
...Advance/retreat rod, 8, 9...Air cylinder.

Claims (1)

[Scope of utility model registration request] A plurality of pawls are installed on the front surface of the rotary chuck in the vicinity of the side perpendicular to the front axis direction of the rotary chuck of the machine tool. Two cylinders having forward and backward rods for rotating the rotary chuck are provided in parallel, and the forward and backward rods of both cylinders are driven forward and backward with a time difference to position the rotary chuck at an arbitrary position at a fixed position. A starting position setting device for a rotary chuck in a machine tool, characterized by: