The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 28, 1986
Filed:
Oct. 19, 1984
Sosaku Kimura, Tokorozawa, JP;
Citizen Watch Co., Ltd., Tokyo, JP;
Abstract
A system for correcting the position of a spindle of a processing machine, in which the spindle is rotatably mounted by hydrostatic bearings in a table on a bed and has an axial hole. A reflector is provided in the hole at a tip end portion, an interferometer is provided adjacent the other end of the spindle opposite the reflector, and a laser unit is provided for emitting a laser beam to the reflector and receiving the reflected laser beam through the interferometer and for producing an output signal dependent on the position of the tip end portion. The output signal is compared with a reference value and the spindle is shifted in accordance with the comparison so as to correct the displacement of the tip end of the spindle caused by thermal expansion.