JPH0243629Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention uses a machine tool such as a machining machine that grips one end of the workpiece in order to process it while indexing a shaft workpiece that is rotatably supported on a support stand on the table of a machine tool such as a machining machine. This invention relates to an indexing device.

[Conventional technology]

Conventionally, when processing various types of shaft workpieces while indexing them, for example, a pair of mounting jigs that rotatably support the shafts at both ends of the shaft workpiece are provided on a conveyor table such as a pallet, and one shaft part is indexed. There is a device that performs a predetermined processing while gripping the device with a chuck and indexing it at a predetermined angle with an indexing device.

[Problem that the invention attempts to solve]

However, in the above-mentioned apparatus, when the type, diameter, length, etc. of the workpiece changes, the height of the pair of mounting jigs must be adjusted or Must be set in advance. For this reason, either a dedicated mounting jig or an adjustment device was required, which required a considerable amount of time for setup work, posing an economical problem.

〔the purpose〕

The purpose of the present invention was proposed in order to solve the problem in view of the above circumstances, and the purpose of the present invention is to interpose an Oldham coupling between the chuck and the rotating shaft of a rotatable indexing device, and to attach it to a mounting jig. To provide an indexing device capable of absorbing changes in deviation even if the axis of a freely rotatable shaft workpiece and the pivot axis of an indexing device are deviated depending on the type of work.

[Means and actions for solving problems]

In order to achieve the above object, the present invention provides an indexing device that grips one end of a workpiece rotatably supported on a machine tool and performs rotational indexing, and a housing forming the base of the indexing device. a pivot shaft rotatably supported by the housing and having a through hole at its axis; a pivot device provided in the housing for pivoting the pivot shaft; and one end fixed to an end of the pivot shaft. an Oldham coupling; a chuck to which the other end of the Oldham coupling is fixed; the chuck is rotatably supported by the chuck in a radial direction with respect to the pivot axis; a shaft for moving the chuck claw in the radial direction to grip the workpiece; a rotational drive source provided behind the rotational shaft; and a rotational drive source driven by the rotational drive source and provided within the rotational shaft. a rotary drive shaft that rotates relative to the pivot shaft; and a universal joint that is provided between the rotary drive shaft and the shaft in a through hole of the pivot shaft and that enables transmission even if the two shafts are eccentric. The center of rotation of the chuck gripping the workpiece is eccentric to the rotation axis, and as the rotation axis rotates, the chuck can be rotated and indexed while maintaining the rotation center position of the chuck. In addition, the chuck is capable of rotating and indexing the chuck around the rotary shaft, and an Oldham coupling is interposed between the rotary shaft and the chuck, so that changes in height can be absorbed. It becomes possible. This eliminates the need for measurements for axis alignment, reducing setup time.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

Fig. 1 is a front sectional view of the indexing device of the present invention using a floating chuck, Fig. 2 is a view in the direction of the arrow in Fig. 1, and Fig. 3 is a -
FIG.

First, in FIG. 1, a worm 2 and a worm wheel 3 are engaged in a housing 1 of an indexing device, and the worm wheel 3 is fitted onto a pivot shaft 4. As shown in FIG. The pivot shaft 4 is fitted into the axis of the rotating body R. The tip of the rotating shaft 4 protrudes from the front surface of the rotating body R, and one end 5a of the Oldham coupling 5 is fitted into the tip of the rotating shaft 4, and is fixed to the rotating body R with a bolt 6. Middle part 5 of Oldham cup ring 5
c also fits into the rotating shaft 4, and the other end portion 5b also fits into the rotating shaft 4 via the intermediate portion 5c, and is fixed to the scroll chuck 7 with bolts 8. The Oldham coupling 5 is covered with a coupling cover 9. The coupling cover 9 is fixed to the rotating body R with bolts 10.

Each end 5a, 5b of Oldham coupling 5,
and 5c are grooved in a cross direction to each other, and are connected to the axis of the shaft work W and the scroll chuck 7.
It is drilled while sliding to absorb the deviation of the axis in the radial direction.

On the other hand, the pivot shaft 4 is a hollow shaft, and a through hole 11 is bored therein. A hydraulic motor 33, which will be described later, is attached to the rear end of the pivot shaft 4 in the through hole 11, and a rotary drive shaft 13 that engages with an output shaft of the hydraulic motor 33 is rotatably supported. A universal joint 15 is connected between the rotary drive shaft 13 and a spline 19a at the rear end of the shaft 19, which is inserted into the axial center of the scroll chuck 7.
The universal joint 15 has joint parts 14 and 17 provided at both ends and an intermediate connecting shaft 15a connected to the pin 1.
6 and 18.

A stator mounting portion 20 is fitted into the rear end of the pivot shaft 4 and fixed to the housing 1 with bolts 21 . An induct sin 22a is fixed to the rear part of the stator mounting portion 20 with bolts 23, and a spacer 2 is provided between the induct sin 22b and the pivot shaft 4.
4 are fitted and fixed to the pivot shaft 4 with bolts 25. At the rear of the housing 1, the back cover 26 is attached to the bolt 2.
Fixed at 7.

Adapter plate 2 fixed to the rear of the pivot axis 4
A cover 31 is attached to the rear of the unit 8 via a mounting member 30.
is fixed with bolts 32, and a hydraulic motor 33 is attached to the rear part of the cover 31.

Further, a nut 12 is screwed into a threaded portion 13 a formed on the hydraulic motor 33 side of the rotary drive shaft 13 , and a dog D is fixed to the nut 12 . It stands out. Furthermore, two proximity switches S are attached to the bracket attached to the side of the back cover 26, and the movement end of the nut 12 due to rotation of the rotary drive shaft 13 is controlled by a dog D.
It is detected by the switch S via the switch S.

Thus, the rotation drive shaft 13 is rotated by the operation of the hydraulic motor 33 via the rotation transmission shaft. The shaft 13 is connected to the shaft 1 via the universal joint 15.
9 , the rotation of the rotary drive shaft 13 is transmitted to the shaft 19 . The rotation of the shaft 19 opens and closes the claws of the scroll chuck, which will be described later.

Next, the driving conditions in which the claws of the scroll chuck 7 are opened and closed will be described.

In FIGS. 2 and 3, the rear end of the shaft 19 is a spline shaft 19a, which is connected to the spline of the joint 17 of the universal joint 15 in FIG. The shaft 19 has a bearing 34a,
Cover 35 attached to the front via 34b,
and is rotatably supported by the back body 36. There are three Master Jiyo 37 on the front body 37.
a is slidably fitted in the master jaw 37a, and a top jaw 48a is fitted with a bolt 49.
It is fixed at a. A scroll gear 39 is interposed in the space formed between the front body 37 and the back body 36, and the scroll portion at the front of the scroll gear 39 meshes with the scroll at the back of the master jaw 37a.

A gear 40 is formed on the shaft 19, and a center gear 41 is interposed between the front body 37 and the back body 36. A shaft 42 is fitted into one end of the center gear 41, a gear 43 is rotatably supported on the shaft 42, and the gear 43 is meshed with a gear 40 formed on the shaft 19.

A ring-shaped bushing 44 is fitted into the outer periphery of an annular shaft portion 37d formed at the center of the interior of the front body 37, and a scroll gear 39 is fitted into the bushing 44.
is rotatably supported.

Furthermore, both side surfaces of the scroll gear 39 are guided by the inner wall 37c of the front body and the side wall of the back body 36, and the outer periphery thereof is also covered by the inner circumferential wall 37b of the front body. An internal gear 39a is formed on the back body 36 side of the scroll gear 39, and a hole 36 bored in the back body 36 is formed.
It meshes with a gear 47 that is rotatably supported on a shaft 46 that is fitted in a.

Further, a center gear 41 rotatably supported on the shaft 19 meshes with a gear 47. Three master jaws 37a that mesh with the scroll of the scroll gear 39 at the back are fitted into the front body 37 so as to be slidable in the radial direction. The master jyo 37a has top jyo 48a, 48b, 4
8c is attached with bolts 49a, 49b, and 49c.

Thus, the rotation transmitted to the shaft 19 is transmitted to the gear 40.
The center gear 41 meshes with the internal gear 3 of the scroll gear 39 via the gear 47.
Scroll gear 39 is meshed with scroll gear 9a.
is transmitted to.

The scroll gear 39 moves the master jaw 37a in the radial direction and moves the top jaw 48a, 48b.
and opening/closing of 48c.

The adjustment operation of the floating chuck of the present invention in the height direction, that is, in the radial direction will be explained.

Since the worm 2 and the worm wheel 3 in the housing 1 are engaged with each other, when the worm 2 is rotated by a drive device (not shown), the pivot shaft 4 is rotated via the worm wheel 3.

A scroll chuck is attached to the front surface of the pivot shaft 4 via an Oldham coupling 5, so that when the pivot shaft 4 rotates, the Oldham coupling 5
By the action of , it absorbs the error in the radial direction and
The center of the indexing device to which the scroll chuck 7 is attached can be easily aligned with the center of the rotation axis.

〔effect〕

This invention not only allows for sufficient indexing even when the center of the chuck and the center of the indexing do not coincide, but also allows the Oldham's screwdriver to be placed between the scroll chuck, which is the gripping part of the rotating indexing device, and the rotating shaft. Since the coupling is used to absorb changes in height, there is no need to measure for axis alignment, which shortens setup time and improves setup work. Furthermore, the mounting jig can be made semi-universal, and the manufacturing cost is also low, making it economical.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of an indexing device in which the floating chuck of the present invention is used, Fig. 2 is a view taken in the direction of the arrow in Fig. 1, and Fig. 3 is a sectional view taken along the - line in Fig. 2. . 1...Housing, 2...Worm, 3...Worm wheel, 4...Swivel shaft, 5...Oldham coupling, 7...Scroll chuck, 13
...Rotation drive shaft, 14, 17...Joint part, 19...
... shaft, 33 ... hydraulic motor, 36 ... back body, 37 ... front body, 39 ... scroll gear, 40, 43, 47 ... gear, 41 ... center gear, 48a, 48b, 48c ... top gear.

Claims (1)

[Claims for Utility Model Registration] An indexing device that grips one end of a workpiece rotatably supported on a machine tool and performs rotational indexing, a housing forming the base of the indexing device; a pivot shaft rotatably supported by the housing and having a through hole at its axis; a pivot device provided in the housing for pivoting the pivot shaft; and an Oldham cup having one end fixed to an end of the pivot shaft. a chuck to which the other end of the Oldham coupling is fixed and is eccentrically eccentric in the radial direction with respect to the pivot axis; a shaft for moving the claws in the radial direction to grip the workpiece; a rotational drive source provided behind the rotational shaft; and a rotational drive source provided within the rotational shaft driven by the rotational drive source. It consists of a rotary drive shaft that rotates relative to the shaft, and a universal joint that is provided between the rotary drive shaft and the shaft in the through hole of the pivot shaft and enables transmission even if the two shafts are eccentric, The rotation center of the chuck gripping the workpiece is eccentric to the rotation axis, and as the rotation axis rotates, the chuck can be rotated and indexed while maintaining the rotation center position of the chuck, and , an indexing device characterized in that the chuck is also capable of pivoting and indexing about the pivot axis.