Wire electrode supplying device for use in a wire cut electric discharge machining apparatus

• US 5,001,321 A
• Filed: 08/08/1989
• Issued: 03/19/1991
• Est. Priority Date: 08/16/1988
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Iwasaki, Takeshi, Yamamoto, Masahiro, Suzuki, Toshio, Magara, Takuji
• Primary Examiner(s): Pellinen, A. D.
• Assistant Examiner(s): Evans, Geoffrey S.
• Application Number:
  US07/390,846
• Time in Patent Office: 588 Days
• Field of Search: 219/69.12, 219/69.14, 219/69.17, 219/69.15
• US Class Current: 219/69.12
• CPC Class Codes: B23H 7/102 Automatic wire threading

Abstract

A detecting unit for detecting when the wire electrode is released from a jet stream of a machining solution during the feeding of the wire electrode. Upon detection of the release of the wire electrode, the feeding of the wire electrode is suspended automatically to remove the deformed wire electrode.

Claims

1. A wire electrode supplying device for use in a wire cut electric discharge machining apparatus in which a wire electrode is conveyed by a wire electrode feeding means from a wire guide on a wire electrode supplying side to a wire guide on a wire electrode receiving side while being restrained by a jet stream of machining solution, comprising:

means for detecting when said wire electrode is not restrained by said jet stream of machining solution; and

means for terminating the operation of said wire electrode feeding means in response to an output of said detecting means.

2. The wire electrode supplying device as defined in claim 1 wherein said detecting means detects the release of said electrode from said jet stream by detecting the contact of said electrode with a workpiece to be machined.

3. The wire electrode supplying device as defined in claim 1 wherein said detecting means comprises a pair of optical sensors.

4. A wire electrode supplying device for use in a wire cut electric discharge machining apparatus in which a wire electrode is conveyed by a wire electrode feeding means from a wire guide on a wire electrode supplying side to a wire guide on a wire electrode receiving side while being restrained by a jet stream of machining solution, said device comprising:

means for detecting when said wire electrode is released from said jet stream of machining solution; and

means for controlling the operation of said wire electrode feeding means in response to an output of said detecting means wherein said detecting means detects the release of said electrode from said jet stream by detecting the contact of said electrode with the wire guide on the wire electrode receiving side.