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:
Aug. 06, 1991
Filed:
Jan. 30, 1990
Mikio Hasegawa, Neyagawa, JP;
Takeshi Shiraishi, Ikoma, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A multi-spindle synchronous drive unit for synchronously driving a plurality of spindles, includes a plurality of motors for respectively driving the spindles, a plurality of encoders for respectively detecting rotational positions of the motors, a plurality of phase locked loop control units for respectively controlling a drive of the motors and for receiving as feedback signals detection signals respectively output by the encoders, a reference pulse oscillator for outputting a pulse signal, and a plurality of multipliers for multiplying the pulse signal by multiplication factors respectively corresponding to rotational speed ratios of the spindles and for respectively outputting speed command pulse signals to the phase locked loop control unit.