JPH01222804A - Chuck device - Google Patents

Abstract

PURPOSE:To make a device compact and enable precise control in a chuck device of the type of holding a workpiece by applying fluid pressure to the whole face to the whole circumference thereof by continuously variably transmitting the driving force of a motor to an operating rod by means of a harmonic driving device. CONSTITUTION:A chuck device 10 includes a liquid-pressure holding means 28 which applies the pressure of a working fluid to the face opposite to a tool or a workpiece 20 to hold the tool or workpiece 20, an operating rod 26 which is coaxially provided with this liquid pressure holding means 28 and which is moved in the axial direction to operate the liquid pressure holding means 28, and a driving motor 32 for driving the operating rod 26. Further, the chuck device 10 includes a harmonic driving device 30 which is linked to the output shaft of the driving motor 32. The output shaft of this harmonic driving device 32 is installed on the operating rod 26. Hence, the harmonic driving device 30 can continuously variably transmit the driving force from the driving motor 32 to the operating rod 26.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a chuck device for holding a workpiece or tool, for example, by applying pressure of a working fluid to the entire circumference thereof.

[Prior art and its problems]

Conventionally, there is a hydraulic pressure holding means that holds the workpiece or tool by applying pressure of a working fluid to the entire circumference of the workpiece or tool, and a hydraulic pressure holding means that is arranged concentrically with the hydraulic pressure holding means and moves in the axial direction. actuating rod means for actuating the hydraulic pressure holding means;
Chuck devices are known that include drive means for driving this actuating rod means. In such chuck devices, the actuating rod means is of the screw-driven type and imparting rotation thereto causes axial movement and exerts pressure on the workpiece or tool via the hydraulic retention means, thereby It is designed to hold. In order to precisely rotate the actuating rod means, the drive means conventionally includes a conventional speed reduction device and a stepper motor having an output shaft disposed concentrically with the actuating rod. In this case, the dimensions of the chuck device are difficult to reduce due to the dimensions of the speed reducer and the stepping motor.

[Purpose of the invention]

It is therefore an object of the invention to provide a chuck device of the above type which is precisely controllable and of compact construction.

[Structure of the invention]

In order to achieve this object, the present invention provides a hydraulic holding means for holding the workpiece or tool by applying pressure of a working fluid to a surface facing the workpiece or tool, and a hydraulic holding means arranged concentrically with the hydraulic holding means. and a chuck device including an actuating rod means that moves in an axial direction to actuate the hydraulic pressure holding means, and a driving means that drives the actuating rod means, wherein the driving means includes a drive motor and a drive motor that drives the actuating rod means. An object of the present invention is to provide a chuck device comprising a harmonic drive device operatively connected to an output shaft of the chuck device, the output shaft of the harmonic drive device being mounted on the actuating rod means.

[For production]

According to such a configuration, the harmonic drive device can continuously transmit the driving force from the drive motor to the actuating rod means.

〔Example〕

Hereinafter, the present invention will be described by way of examples with reference to the accompanying drawings.

In the figure, the chuck device 10 is not shown in the machine body)
It includes a body portion 12 adapted to be mounted and secured to an intermediate portion 18 having an actuating chamber 16 housing an actuator 14 and cooperating with a tool or workpiece 20 to be held. and a front portion 22.

The front portion 22 has a screw hole 2 extending axially through its center.
4, and an actuating rod 26 is screwed into the threaded hole 24, and the actuating rod moves axially within the threaded hole 24 when rotated. The outer end of the actuating rod 26 (
The right end (as viewed in the figure) cooperates with hydraulic pressure retention means 28 provided at the front end of the front part 22.

Although not shown in detail in the drawings, the hydraulic pressure holding means 28 applies the pressure of the working fluid in the radial direction when a force is transmitted from the working rod 26 to the surfaces 2OA and 20B facing the tool or workpiece 20. This is a well-known structure that applies pressure to hold it in place. In addition, as this holding surface, for example,
From the viewpoint of holding power, it is preferable to cover the entire circumference.

The inner end (i.e., the left end as viewed in the figures) of the actuation rod 26 is operably connected to an actuator 14 which rotates the actuation rod 26 to actuate the hydraulic retention means 28 in the manner described above. . Actuator 1
4 consists of a harmonic drive device 30 having an output shaft arranged concentrically with the actuation rod 26, and an elongated drive motor 32 arranged concentrically with the harmonic drive device. Drive motor 3
2 and its control is through lead wires 34 and 36.
It is carried out by

The harmonic drive 30 is a compact structure with a large reduction ratio, as is well known in the art.

In addition, a small and powerful battery is built in to drive the drive motor 3.
2 may be energized. Furthermore, the chuck device according to the present invention can be used either as a stationary type or as a rotary type.

〔Effect of the invention〕

Therefore, by connecting such a harmonic drive device to the actuating rod, the entire chuck device becomes compact, and the force transmitted to the tool or work piece via the hydraulic pressure holding means can be controlled steplessly and precisely. .

Additionally, if the device has a built-in battery, complete wireless remote control is possible.

[Brief explanation of the drawing]

The figure is a partially sectional side view of a chuck device according to the invention.

Claims (1)

[Claims] a hydraulic pressure holding means for holding the workpiece or tool by applying pressure of a working fluid to a surface facing the workpiece or tool; A chuck device including actuating rod means for actuating the pressure holding means and drive means for driving the actuating rod means, wherein the drive means includes a drive motor and a harmonic drive device operatively connected to an output shaft of the drive motor. A chuck device comprising: an output shaft of the harmonic drive device mounted on the actuating rod means.