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:
Apr. 27, 1993
Filed:
Aug. 28, 1991
Akira Takara, Moriguchi, JP;
Toru Nakagawa, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A rotary apparatus includes a rotary spindle, a front end portion of which projects from a shell to an outside thereof and which is supported by magnetic force while the spindle is rotating, a working tool being mountable on the front end portion of the spindle. A first sensor is provided for detecting a position of the front end portion of the spindle in a radial direction thereof and is provided on the front end portion of the shell and in an annular space formed at a periphery of the front end portion of the spindle such that the first sensor occupies a volume of not more than 50% of the annular space. A second sensor is provided, for detecting a position of a rear end portion of the spindle in the radial direction thereof and is provided on the rear end portion of the shell.