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:
Dec. 09, 2008
Filed:
Jun. 28, 2007
Sadatsune Ammi, Toyama, JP;
Sadatsune Ammi, Toyama, JP;
Nippei Toyama Corporation, Tokyo, JP;
Abstract
The method for detecting any clamping malfunction of the work within the machine tool which clamps both ends of the work with clamping mechanismsof a pair of headstocksand processes the work by spinning the work through synchronous rotation of main spindlesof the pair of headstocks by servomotorswherein, after clamping the both ends of the workwith the clamping mechanismsof the respective headstocksand while both the servomotorsof the headstocks are in a servo-ON state, a command for a minute angle α rotation is given to the servomotorof only one of the headstocks, and at this point, any malfunction in clamping is determined when a current or torque generated within the servomotor of one or the other of the headstocks is smaller than a predetermined value.