Guide bush control device and method of adjusting guide bush

• US 9,676,071 B2
• Filed: 03/06/2014
• Issued: 06/13/2017
• Est. Priority Date: 03/18/2013
• Status: Active Grant

• Current Assignee: Citizen Watch Co Limited (Citizen Electronics Company Limited)
• Original Assignee: Citizen Machinery Co., Ltd. (Citizen Electronics Company Limited), Citizen Watch Co Limited (Citizen Electronics Company Limited)
• Inventors: Kobayashi, Yosuke, Takahashi, Hikaru
• Primary Examiner(s): Fridie, Jr., Will
• Application Number:
  US14/774,020
• Publication Number:
  US 20160023314A1
• Time in Patent Office: 1,195 Days
• CPC Class Codes: B23B 13/126 Supports
• CPC Class Codes: B23B 31/2072 Axially moving cam, fixed jaws
• CPC Class Codes: B23B 7/06 with sliding headstock
• CPC Class Codes: B23Q 1/763 Rotating steadies or rests

Abstract

A guide bush control device includes a guide bush motor that rotates and drives a guide bush; and a controller that controls driving of the guide bush motor, the guide bush control device controlling rotation of the guide bush by controlling the driving of the guide bush motor with the controller, wherein the controller includes a fixing unit that fixes the guide bush non-rotatably by exciting the guide bush motor in a rotation stop state.

Claims

1. A guide bush control device, comprising:

a guide bush motor configured to rotate and drive a guide bush; and

a controller configured to control driving of the guide bush motor,

wherein the controller is configured to control a fixing device to fix the guide bush non-rotatably by exciting the guide bush motor in a rotation stop state.

2. The guide bush control device according to claim 1, wherein the controller includes a rotation regulator configured to regulate a rotation speed of the guide bush to 0 when a rotation command is sent to the guide bush, and

the fixing device configured to excite the guide bush motor with the rotation regulator in operation.

3. The guide bush control device according to claim 1 further comprising

a manual operator configured to generate a signal for driving the guide bush motor by a manual operation, wherein

the controller includes a manual operation regulator that configured to invalidate the signal from the manual operator, and

the fixing device is configured to excite the guide bush motor with the manual operation regulator in operation.

4. The guide bush control device according to claim 1, wherein

the guide bush is in a cover of a machining tool, and

the fixing device is configured to start excitation of the guide bush motor while an openable and closable door provided in the cover IS Closed.

5. The guide bush control device according to claim 1, wherein

the guide bush is driven by a main spindle motor that drives a main spindle of a machining tool, and

the guide bush is fixed non-rotatably by exciting the main spindle motor.

6. The guide bush control device according to claim 5, wherein

the guide bush motor and the main spindle motor are separately provided, and

the guide bush motor and the main spindle motor are driven in synchronization with each other.

7. The guide bush control device according to claim 5, wherein

the main spindle motor configured to operate as the guide bush motor, and

the main spindle and the guide bush are integrally rotated and driven by the main spindle motor.

9. The guide bush control device according to claim 1, wherein the controller is configured to selectively switch synchronization and non-synchronization of the guide bush motor and the a main spindle motor.

10. The guide bush control device according to claim 9, wherein when the guide bush motor is synchronized with the main spindle motor, the driving of the guide bush motor is controlled integrally with the main spindle motor.

11. The guide bush control device according to claim 9, wherein when the guide bush motor is not synchronized with the main spindle motor, the driving of the guide bush motor is independently controlled.

12. The guide bush control device according to claim 9, wherein when the guide bush motor and the main spindle motor are synchronized, the guide bush and a main spindle are rotated and driven in synchronization.

13. The guide bush control device according to claim 9, wherein when the guide bush motor and the main spindle motor are not synchronized, the guide bush and a main spindle are separately rotated and driven.

14. The guide bush control device according to claim 1, wherein when the guide bush motor is excited in a rotation stop state, a retention torque that retains a rotor of the guide bush motor in a stop position is obtained.

15. The guide bush control device according to claim 1, further comprising a rotation shaft of the guide bush motor and a timing pulley,

wherein the rotation shaft of the guide bush motor and the timing pulley are connected via a timing belt.

16. The guide bush control device according to claim 1, further comprising a motor amplifier of the guide bush motor and a motor amplifier of a main spindle motor,

wherein the controller is configured to send a synchronization signal to the amplifier of the guide bush motor and the motor amplifier of the main spindle motor.

8. A method of adjusting a guide bush of a guide bush device including a guide bush motor that rotates and drives the guide bush and a controller that controls driving of the guide bush motor, the method comprising:

when adjusting the guide bush, fixing the guide bush non-rotatably by exciting the guide bush motor in a rotation stop state by controlling the driving of the guide bush motor with the controller.

17. A guide bush control device, comprising:

a guide bush motor configured to rotate and drive a guide bush; and

a controller configured to control driving of the guide bush motor, wherein;

the controller is configured to control a fixing device to fix the guide bush non-rotatably by exciting the guide bush motor in a rotation stop state,

the guide bush is in a cover of a machining tool, and

the fixing device is configured to start excitation of the guide bush motor while an openable and closable door provided in the cover is closed.