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:
Mar. 16, 1993
Filed:
Jan. 29, 1992
Donald C Buch, Penfield, NY (US);
John P Marcelletti, Hilton, NY (US);
Eastman Kodak Company, , NY (US);
Abstract
A brake for a sprocket-optical encoder assembly associated with an electrophotographic copier consists of a metal disc positioned in a magnetic field, mounted on a common shaft with the sprocket driving an optical encoder. The teeth of the sprocket are engaged in perforations in the photoconductor film belt of the copier, and the sprocket and the shaft, together with the disc and encoder are, therefore, driven by movement of the film. As the disc is caused to rotate in the magnetic field, eddy currents are generated therein which resist the rotation. Such resistance acts as a brake on the sprocket, causing the trailing edge of its teeth to maintain contact with the trailing edge of the perforations, thereby avoiding back and forth movement of the teeth within the perforations and consequential destructive impacts with the edges thereof.