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:
May. 22, 1990
Filed:
Mar. 09, 1987
Kazuto Tomikawa, Mishima, JP;
Hideo Fujie, Nagaizumi, JP;
Toshiba Kikai Kabushiki Kaisha, Tokyo, JP;
Abstract
Relative displacement of parts of a machine tool caused by thermal deformation is compensatively corrected for by a correction system comprising a diffused light source mounted near the main spindle of the machine tool for holding a machining tool, a lens mounted apart from the light source on the table which is moveable relative to the main spindle and functions to hold a workpiece, a light spot displacement detector for detecting variation of position of a light source image formed by the lens and generating a corresponding detection signal, and a control means operating to compute, from this signal, any relative displacement of the table and the light source and, on the basis of this relative displacement, to correct the relative position of the table and the main spindle.