Bar material supplying device and numerical control machine tool having the same

Patent metadata

Field	Value
Publication number	US-9731353-B2
Application number	US-201414917489-A
Country	US
Kind code	B2
Filing date	Sep 8, 2014
Priority date	Sep 18, 2013
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A bar material supplying device includes a feed rod having a leading end provided with a finger chuck, a feed rod servomotor and an air cylinder device that move the feed rod in a longitudinal direction to insert and pull the bar material into and from the finger chuck, and an NC device that controls driving of the feed rod servomotor and driving of the air cylinder device. The NC device controls the driving of the feed rod servomotor and the driving of the air cylinder device to move the feed rod in an operation of inserting and pulling the bar material into and from the finger chuck, and operates as an error allowable device that allows an error of an operation amount of the feed rod servomotor motor in the operation of inserting and pulling the bar material into and from the finger chuck.

First claim

The invention claimed is:

1. A bar material supplying device, comprising:
a feed rod having a leading end, the leading end including a finger chuck, the finger chuck configured to insertably and detachably hold a bar material;
a motor and a cylinder device, each of the motor and the cylinder device independently configured to move the feed rod in a longitudinal direction to insert the bar material into the finger chuck or pull the bar material from the finger chuck; and
a control device configured to control driving of the motor and driving of the cylinder device, wherein
the control device is configured to control the driving of the motor and the driving of the cylinder device to move the feed rod in an operation of inserting and pulling the bar material into and from the finger chuck, and
the control device is further configured to allow an error of an operation amount of the motor in the operation of inserting and pulling the bar material into and from the finger chuck.

2. The bar material supplying device according to claim 1 , wherein the control device is configured to set an allowable range of the error of the operation amount of the motor to be larger than an allowable range of an error of an operation amount in an operation except the operation of inserting and pulling the bar material into and from the finger chuck.

3. The bar material supplying device according to claim 1 , wherein the control device includes a current controller that is configured to control a driving current of the motor.

4. The bar material supplying device according to claim 1 , wherein the cylinder device is configured to be isolated from driving the feed rod in an operation except the operation of inserting and pulling the bar material into and from the finger chuck.

5. The bar material supplying device according to claim 1 , further comprising:
a memory configured to store
an allowable range corresponding to the operation of inserting and pulling the bar material into and from the finger chuck, and
an allowable range corresponding to an operation except the operation of inserting and pulling the bar material into and from the finger chuck,

wherein the control device is configured to
select the allowable range corresponding to the operation of inserting and pulling the bar material into and from the finger chuck of the memory when inserting and pulling the bar material into and from the finger chuck, and
select the allowable range corresponding to the operation except the operation of inserting and pulling the feed rod into and from the finger chuck of the memory in the operation except the operation of inserting and pulling the bar material into and from the finger chuck to determine the error of the operation amount of the motor.

6. The bar material supplying device according to claim 1 , wherein the control device is configured to set a size of an allowable range of the error of the operation amount of the motor according to a command code of the operation to the bar material supplying device that corresponds to the operation of inserting and pulling the bar material into and from the finger chuck.

7. A numerical control machine tool including the bar material supplying device according to claim 1 .

8. The bar material supplying device of claim 1 , wherein at least the cylinder device is coupled to the feed rod, and is further configured to move the feed rod in the longitudinal direction, via a connection member that is connected to an exterior of the feed rod.

9. An apparatus, comprising:
a feed rod having a leading end, the leading end including a finger chuck, the finger chuck configured to insertably and detachably hold a bar material; and
a motor and a cylinder device, each of the motor and the cylinder device independently configured to move the feed rod in a longitudinal direction to insert the bar material into the finger chuck or pull the bar material from the finger chuck.

10. The apparatus of claim 9 , wherein each of the motor and the cylinder device are coupled to the feed rod via separate, independent connection members.

11. The apparatus of claim 10 , further comprising:
a chain coupled to the feed rod, such that the feed rod is configured to be moved in the longitudinal direction based on a movement of the chain,
wherein the motor is coupled to the chain, such that the motor is configured to drive the chain in the longitudinal direction to move the feed rod in the longitudinal direction, and
wherein the cylinder device is coupled to the chain independently of the motor, such that the cylinder device is configured to drive the chain in the longitudinal direction, independently of the motor, to move the feed rod in the longitudinal direction.

12. The apparatus of claim 11 , wherein the cylinder device is configured to be disconnected from the chain.

13. The apparatus of claim 9 , further comprising:
a control device configured to control driving of the motor and driving of the cylinder device, wherein
the control device is configured to control the driving of the motor and the driving of the cylinder device to move the feed rod in an operation of inserting and pulling the bar material into and from the finger chuck, and
the control device is further configured to allow an error of an operation amount of the motor in the operation of inserting and pulling the bar material into and from the finger chuck.

14. The apparatus of claim 13 , wherein the control device is configured to set an allowable range of the error of the operation amount of the motor to be larger than an allowable range of an error of an operation amount in an operation except the operation of inserting and pulling the bar material into and from the finger chuck.

15. The apparatus of claim 13 , wherein the control device includes a current controller that is configured to control a driving current of the motor.

16. The apparatus of claim 13 , wherein the cylinder device is configured to be isolated from driving the feed rod in an operation except the operation of inserting and pulling the bar material into and from the finger chuck.

17. The apparatus of claim 13 , further comprising:
a memory configured to store
an allowable range corresponding to the operation of inserting and pulling the bar material into and from the finger chuck, and
an allowable range corresponding to an operation except the operation of inserting and pulling the bar material into and from the finger chuck,

wherein the control device is configured to
select the allowable range corresponding to the operation of inserting and pulling the bar material into and from the finger chuck of the memory when inserting and pulling the bar material into and from the finger chuck, and
select the allowable range corresponding to the operation except the operation of inserting and pulling the feed rod into and from the finger chuck of the memory in the operation except the operation of inserting and pulling the bar material into and from the finger chuck to determine the error of the operation amount of the motor.

18. The apparatus of claim 13 , wherein the control device is configured to set a size of an allowable range of the error of the operation amount of the motor according to a command code of the operation that corresponds to the operation of inserting and pulling the bar material into and from the finger chuck.

19. The apparatus of claim 9 , wherein at least the cylinder device is coupled to the feed rod, and is further configured to move the feed rod in the longitudinal direc

Assignees

• Citizen Machinery Co Ltd
• Citizen Watch Co Ltd

Inventors

• Watanabe Kiyohiko
• Shibui Yutaka

Classifications

• B23B13/022

  being placed in the spindle · CPC title

• B23B7/02

  Automatic or semi-automatic machines for turning of stock · CPC title

• B23B13/125

  Feed collets (feeding device having intermittent movement being placed in the spindle including two collets B23B13/024; collet chucks B23B31/20) · CPC title

• B23Q2707/003

  in a lathe · CPC title

• B23B13/021 Primary

  Feeding device having intermittent movement · CPC title