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:
Nov. 12, 2013
Filed:
Mar. 27, 2008
Atsushi Inoue, Hiroshima, JP;
Mutsumi Yoshikawa, Shiga, JP;
Hiroyuki Tauchi, Shiga, JP;
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Abstract
A spindle device of machine tool includes a pressure sensor () that detects a pressing force to a rod () by a drive (), a displacement sensor () that detects displacement of the rod (), a tool clamping-force detector () that detects a clamping force to a tool () by a collet () based on the pressing force to the rod () and the displacement of the rod (), and a spring-replacement-timing determining unit () that determines a replacement timing of disc springs () based on the tool clamping force and a preset biasing force characteristic value of the disc springs (), thereby allowing highly accurate determination of a replacement timing of a biasing unit by appropriately detecting a tool clamping force.