METHOD OF CHANGING TOOLS IN PUNCH PRESS MACHINE

Title:

METHOD OF CHANGING TOOLS IN PUNCH PRESS MACHINE

Document Type and Number:

WIPO Patent Application WO/1992/019397

Kind Code:

A1

Abstract:

A method of changing tools in a punch press machine, capable of changing punch tools (11a, 11b...) without being influenced by backlash. It is determined whether a tool change command (T command) is output or not (S1). When the command is output, subsequently, it is determined wether or not a C shaft (3) as being a control shaft of a punch tool is in a state of being controlled and rotated (S2). When the C shaft is under control, the C shaft (3) is rotated in a rotating direction preset by a parameter to be returned to a mechanical original point (40) (S3), and the change of the tools is performed (S4 - S6). Incidentally, when the T command is not output at the above-described (S1), a program is completed. Furthermore, when the C shaft is not controlled and stays in the original point position, the change of the tools is performed as it is. Thus, the C shaft (3) is always rotated only in one and the same direction preset and returns to the mechanical original point. Therefore, a gear mesh-up state at the time when the C shaft (3) returns to the mechanical original point (40) and stops thereat is always kept the same. Accordingly, the backlash of the gear becomes the same, so that the change of the tools can be performed without correcting for the backlash.

Inventors:

MIYAJIMA KEIICHIRO (JP)

Application Number:

PCT/JP1992/000507

Publication Date:

November 12, 1992

Filing Date:

April 20, 1992

Export Citation:

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Assignee:

FANUC LTD (JP)

International Classes:

B21D28/36; B21D37/04; B21D37/14; B23Q3/155; G05B19/18; G05B19/404; (IPC1-7): B21D28/36; B21D37/04

Foreign References:

JPS606226A	1985-01-12
JPS61212434A	1986-09-20

Other References: