Browse Prior Art Database

AUTOMATIC REDUCTION CONTROL

IP.com Disclosure Number: IPCOM000024526D
Original Publication Date: 1980-Oct-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 49K

Publishing Venue

Xerox Disclosure Journal

Abstract

In using an electrophotographic copier having reduction capability, the operator will frequently experience difficulty in selecting the proper match between the machine's reduction ratio and the copy paper size. This disclosure relates to a solution of this problem which involves automatic sensing of the size of the original document and adjustment of the magnification to produce an image which matches the size of the copy paper being used by the copier.

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XEROX DISCLOSURE JOURNAL

AUTOMATIC REDUCTION CONTROL Proposed Donald W. Schaeffer Classification

U.S. Cl. 355/3 Int. Cl. G03g 15/00

In using an electrophotographic copier having reduction capability, the operator will frequently experience difficulty in selecting the proper match between the machine's reduction ratio and the copy paper size. This disclosure relates to a solution of this problem which involves automatic sensing of the size of the original document and adjustment of the magnification to produce an image which matches the size of the copy paper being used by the copier.

Two linear arrays of photodiodes are recessed into the platen cover of the copier along the length and width margins for the original document. In this way, a document registered on the platen intercepts the illuminated strip diode segments at points which provide a reference signal.

Control electronics within the copier compare this reference signal with infor- mation on copy paper size and adjusts the optical magnification to provide the best match between document and copy paper sizes.

Volume 5 Number 5 September/October 1980 517

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September/October 5 Number 5 Volume DISCLOSURE XEROX 518 JOURNAL 1980

[This page contains 1 picture or other non-text object]