Automatic setup apparatus for an electrophotographic printing ma

Details Automatic setup apparatus for an electrophotographic printing ma Automatic setup apparatus for an electrophotographic printing ma

1985-11-18

1987-03-03

Prescott, A. C.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 14CH, 355 14D, 355 14E, G03G 1500

Patent

active

046471847

ABSTRACT:
An automated process and apparatus is provided for establishing the basic xerographic operating parameters for an electrophotographic printing machine. The document scanning means is used in a setup mode to generate test patches of varying density on the machine photoreceptor. The levels are measured and compared to present values stored in a digital controller memory until convergence is obtained along three separate points on the PIDC curve. The controller adjusts the system parameters of charge circuit, developer bias and system exposure in an iterative process and corresponding to the photo-induced discharge curve for the particular machine.

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Article entitled "Automated Setup for Xerographic Copiers", by Robert L. Thompson, Xerox Disclosure Journal, vol. 9, No. 3, May/Jun. 1984, p. 179.

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