Title:
POSITION SENSOR AND CONTACT NEEDLE
Document Type and Number:
WIPO Patent Application WO/2000/062010
Kind Code:
A1
Abstract:
The contact tip of a contact body of a position sensor for sensing a work is made of a nonmagnetic material containing tungsten carbide and about 6 to 16% of nickel as a binder. The contact body is connected to a contact sensing circuit in a state where it is electrically insulated. When the contact body is electrically connected through a tool and tool holder of the machine and through the work, the contact sensing circuit is switched on/off to measure the relative position between the work and the tool and tool holder. If the contact body is a thin contact needle, the rod is made of a nonmagnetic material, or preferably an age-hardened material of beryllium copper. Degradation of the measurement accuracy due to magnetization of the contact body is prevented.
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Inventors:
FUKUHISA NORIO (JP)
Application Number:
PCT/JP2000/002220
Publication Date:
October 19, 2000
Filing Date:
April 06, 2000
Export Citation:
Assignee:
NISSHIN SANGYO CO (JP)
FUKUHISA NORIO (JP)
FUKUHISA NORIO (JP)
International Classes:
G01B7/00; G01B1/00; G01B5/012; (IPC1-7): G01B7/00; G01B1/00; G01B5/00; G01B21/00
Foreign References:
| US4153998A | 1979-05-15 | |||
| US5273571A | 1993-12-28 | |||
| US4394185A | 1983-07-19 | |||
| JPS5987605U | 1984-06-13 | |||
| JPH01110313U | 1989-07-25 | |||
| JPS63200707U | 1988-12-23 | |||
| JPS62205275A | 1987-09-09 | |||
| JPS62218567A | 1987-09-25 | |||
| JPH0280901A | 1990-03-22 |
Attorney, Agent or Firm:
Nishi, Takao (Daiwamachi Kanazawa-shi Ishikawa, JP)
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