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:
Jan. 02, 1979
Filed:
Nov. 22, 1977
International Business Machines Corporation, Armonk, NY (US);
Abstract
The disclosure describes an electro-optical tachometer assembly for use with a device having a movable part and a fixed part (for example, a motor, an electrophotographic system, etc). The electro-optical tachometer assembly comprises a movable assembly and a fixed assembly. The movable assembly includes a movable disk while the fixed assembly includes a fixed mask. A gap between the movable disk and the fixed mask is preset by a spacer assembly. The gap is maintained constant by a resilient member which loads the fixed assembly against the movable assembly. A light emitting diode (LED) phototransistor assembly is situated relative to the tachometer assembly and outputs electrical signals indicative of shaft speed, direction of shaft rotation, etc. Synchronization of the tachometer output to the shaft is accomplished by a guide pin arrangement.