Photocopying – Contact printing – Light boxes
Patent
1992-01-29
1993-03-16
Grimley, A. T.
Photocopying
Contact printing
Light boxes
188158, 355202, G03G 500
Patent
active
051948966
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.
REFERENCES:
patent: 2956718 (1960-10-01), Beveridge
patent: 3974952 (1976-08-01), Swanke et al.
patent: 4013358 (1977-03-01), Kawai
patent: 4110670 (1978-08-01), Araki et al.
patent: 4671645 (1987-06-01), Saito et al.
patent: 4821066 (1989-04-01), Foote, Jr. et al.
patent: 4884105 (1989-11-01), Joseph et al.
Buch Donald C.
Marcelletti John P.
Eastman Kodak Company
Grimley A. T.
Hochberg D. Peter
Kusner Mark
Royer William J.
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