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:
Oct. 14, 2003
Filed:
Mar. 07, 2001
Hiroki Miura, Hachioji, JP;
Kokusai Keisokuki Kabushiki Kaisha, Tokyo, JP;
Abstract
A method and an apparatus for accurately measuring an initial imbalance deviating from a predetermined imbalance, when the predetermined imbalance is to be left in a body of rotation. In the method and apparatus, data relating to the predetermined imbalance is stored in a memory as dummy value information. The vibration of a crank shaft during rotation is detected by vibration sensors L, R to obtain analogue vibration signals WDL, WDR. The rotational angle position of the crank shaft is detected by a photo sensor and, in response, the above described dummy value information is converted to analogue dummy signals DLX, DLY, DRX and DRY by multi D/A converters L, R, L and R. These analogue dummy signals are removed from the analogue vibration signals to obtain analogue initial imbalance signals WL, WR, which are converted by D/A converter to obtain the digital initial imbalance value.