JPS649122B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a diaphragm chuck for gripping a workpiece, and particularly to a diaphragm chuck in which the claw portion is rotatable and indexable so that it can be replaced automatically so as to be able to automatically handle various workpieces with different diameters. This invention relates to a rotary type diaphragm chuck.

Prior Art When various workpieces with different diameters are supplied to the chuck of a machine tool, an operator has conventionally replaced the jaw of the chuck with a jaw suitable for the workpiece. As a result, it takes time to remove and install the claws, the tightening force of the bolts for mounting the claws is uneven, resulting in poor accuracy, and furthermore, there are disadvantages such as the need to remove dust attached to the mounting surface when replacing the claws. It had

Purpose The present invention was made to eliminate the above-mentioned drawbacks, and aims to provide a diaphragm chuck that can handle multiple types of workpieces by automatically moving and selecting the claws and locating pins. It is something.

Solution The present invention attaches a rotary index type claw member having several types of gripping parts suitable for the diameter of the workpiece at multiple locations on the same circumference of a diaphragm, and attaches a plurality of locating pins on the same circumference in the middle of the claw member. The individually planted discs are mounted so as to be rotatable, and means is provided for rotating and indexing the claw member and the disc in conjunction with each other, so that the tip of the claw is automatically indexed to the gripping position according to the workpiece. This chuck is designed to be able to handle a wide variety of workpieces.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. A pin 2 is implanted on the upper surface of the base 1, and a headstock 3 is attached so as to be pivotable about the pin 2 and fixed in position. Headstock 3
A main shaft 5 is rotatably supported through a housing 4, and a chuck portion 6 is attached to the front end surface of the main shaft 5. The chuck portion 6 is composed of a cylinder portion 7, a diaphragm portion 8, a rotary jaw portion 9, and a rotary locating pin portion 10.

The cylinder portion 7 consists of a bucking plate 11 directly fixed to the front end surface of the main shaft 5, a cylinder body 12, and a piston 13. The piston 13 has an internal gear 14 carved therein. Also piston 1
The piston rod 15 of No. 3 has a sleeve shape and extends to the rear through the through hole of the main shaft 5. The diaphragm portion 8 is a diaphragm body 1 which is clamped to the front end surface of the cylinder body 12 by a presser plate 16.
7 and the cylinder body 1 parallel to the axis of the main shaft 5.
The pressure pin 18 has a length extending from the front end surface of the piston 13 to the inner circumferential rear end surface of the diaphragm body 17. The rotary jaw portion 9 includes a housing 19 fixed at three equiangular positions on the circumference of the diaphragm body 17, and the housing 1
The rotating shaft 20 is rotatably supported by a rotary shaft 20, a gear 22 is mounted on the rear end of the rotary shaft 20, and a gear 22 is mounted on the rear end of the rotary shaft 20 and meshes with the internal gear 14. The Joe plate 21 has arc-shaped claws 23 at four equiangular positions on the outer circumference, each having a different dimension from the center of the rotating shaft 20. In this example, three Jyo plates 21 have the same shape, and the claws 23 are provided in the same phase relationship. The rotary locate pin portion 10 includes a housing 24 fixed to the cylinder body 12 at three equal positions on the same circumference in the middle of the rotary jaw portion 9, a rotating shaft 25 supported by the housing 24, and a front end of the rotating shaft 25. A disc 26 attached to the surface and a gear 2 attached to the rear of the rotating shaft 25 and meshing with the internal gear 14.
It starts from 7. Locate pins 28 are implanted on the front end surface of the disc 26 at four equiangular positions at different distances from the center of the rotating shaft 25.
The locating pins 28 of each disc 26 are located at the same position, have the same phase relationship, and are provided in a relationship corresponding to the claws 23 of the Jyo plate 21, respectively. A pulley 29 is fixed to the rear end of the main shaft 5 to which rotation from a drive source (not shown) is transmitted. Further, an indexing lead body 31 having a lead groove 30 for rotationally indexing the jaw plate 21 and the disc 26 is keyed to the rear part of the piston rod 15.

A sliding body 3 is provided on the outer periphery of the index lead body 31 so as to be movable in the direction of the spindle axis while covering the outer periphery.
2 is loosely fitted and engages with a transmission pin 33 implanted in the pulley 29. And sliding body 3
Even if 2 moves, this engagement will not come off.
Further, a connecting pin 34 having one end inserted into the lead groove 30 is implanted in the sliding body 32. A cylinder device 36 for moving the sliding body 32 is attached to a bracket 35 that projects rearward from the headstock 3, and a shifter 37 fixed to the tip of this cylinder device 36 engages with the sliding body 32. ing. Further, four ring-shaped dogs 38 are attached to the outer periphery of the indexing lead body 31 for confirming the pivoting and indexing positions of the jaw plate 21 and the disc 26. A spring 39 is attached to the sliding body 32.
A confirmation pin 40 is attached which is always pressed into contact with this ring-shaped dog and can be moved in and out in the radial direction. Furthermore, a proximity switch 41 is attached to the bracket 35 for detecting the radial movement of the confirmation pin. An ejector rod 42 is inserted into the center hole of the sleeve-shaped piston rod 15, and an engaging portion 4 is provided at the rear end.
3, which engages with a shifter 45 fixed to the tip of a drive cylinder device 44 attached to the bracket 35. Further, a workpiece ejector 46 is attached to the front end of the ejector rod 42, which can be replaced depending on the workpiece to be gripped. This work ejector 46 is provided with a nozzle hole for cooling water, and cooling water is supplied through the center hole 47 of the ejector rod 42.

Next, the effect will be explained. The workpiece is gripped by the Joe plate 21 and the ejector rod 4 is used during machining.
Cooling water supplied through the center hole 47 of No. 2 is injected from the nozzle to the processing area. When the machining is completed, the supply of cooling water is stopped, the rotation of the main shaft 5 is stopped, pressure fluid is sent to the rear chamber of the cylinder portion 7, and the piston 13 is moved forward. and press pin 18
moves forward, the diaphragm body 17 is pushed forward at the center, and the three jaw plates 21 open. At the same time, the drive cylinder device 44 is activated, and the ejector rod 42 and workpiece ejector/nozzle 46 move forward to eject the workpiece forward. Next, when a workpiece of the same diameter is to be gripped, the workpiece ejector 46 retreats, and when a new workpiece is fed and pressed against the locate pin 28, the pressure fluid sent to the rear chamber of the cylinder portion 7 is discharged. The new workpiece is gripped by the Joe plate 21 due to the elasticity of the diaphragm body 17. When gripping workpieces with different diameters, the cylinder device 36 is operated to move the slider 32 with the workpiece ejector 46 and diaphragm body 17 retracted. Due to the movement of the sliding body 32, the index lead body 31 is moved into the lead groove 30 by the connecting pin 34.
A certain angle of rotation is indexed according to the angle of rotation. The piston rod 15 is rotated by the rotation of the index lead body 31.
Piston 13 is pivoted. Then, the internal gear 14 of the piston 13 rotates, the gears 22 and 27 rotate together, and the Joe plate 21 and the disk 26 are rotated and indexed in conjunction with each other. This indexing position is determined by the rotation of the index lead body 31, which causes the ring-shaped dog 38 to rotate together, and the proximity switch 41 to detect the radial movement of the confirmation pin 40, which is constantly in contact with the dog 38. . After the required claws 23 and locating pins 28 are indexed in this way, the diaphragm body 17 is indexed as described above.
is activated and a new workpiece with a different diameter is gripped. After gripping the workpiece, the pulley 29 is rotated and the main shaft 5 is rotated, and at the same time, the slider 32 is rotated by the transmission pin 33. Since the position of the sliding body 32 in the direction of the main shaft axis is restricted by the cylinder device 36, rotation is transmitted to the indexing lead body 31 by the connecting pin 34, and then to the piston rod 15 and the piston 13 via the key. The rotation of the main shaft 5 is controlled by the packing plate 11 and the cylinder body 12.
Since the chuck portion 6 rotates, the entire chuck portion 6 rotates in the same direction as the main shaft. In this way, the workpiece is rotated and processed. In this example, the Jyo plate has four types of claws, but it goes without saying that this number can be increased or decreased as necessary.

Effects As detailed above, the present invention enables each claw member attached to the diaphragm to rotate, and each claw member has a gripping portion arranged around the center of rotation that can grip workpieces of the same shape but different diameters. In addition, the locating pin that regulates the axial position of the workpiece, which is installed in the rotating disk in the middle of the claw member, can be indexed in conjunction with the claw, so that it can be used with the gripping part for various workpieces with different diameters. The locate pin is automatically indexed and can be grasped. Moreover, it is not only possible to handle workpieces with different diameters in a short time, but also to grip various workpieces with stable accuracy.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, and FIG. 2 is a view taken from FIG. 1. 17...Diaphragm body, 21...Jyo plate, 23...Claw, 26...Disc, 28...Locate pin.

Claims (1)

[Claims] 1. A plurality of circular rotating claw members that are rotatably provided on a concentric circle of a diaphragm and each have a plurality of gripping parts that are arranged at different distances from the center around the center of rotation and can grip workpieces of different diameters. , a disc rotatably provided on the same circumference in the middle of the rotating claw member, and a disc provided at a position corresponding to the gripping portion around the center of rotation of the disc in the axial direction of the workpiece. A diaphragm chuck characterized in that it is provided with a locating pin for regulating the position, and a means for interlocking and indexing the rotating claw member and the disc with respect to various workpieces.