Browse Prior Art Database

Automatic Photoconductor Advance Control

IP.com Disclosure Number: IPCOM000077601D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Sebastian, WH: AUTHOR [+2]

Abstract

U. S. Patent 3,600,086 describes a photocopy machine having a copy drum including an elongated photoconductive web, on which a predetermined number of copies are made on each of a plurality of successive web increments. The number of copies made on each increment are counted and an automatic advance circuit is energized when the predetermined number has been reached. A cam disc 10 is rotated in progressive small increments as driven by a synchronous motor 11, operated for a fixed period of time during each of a series of copy cycles. The accumulative rotation of disc 10 reflects the number of such copy cycles. When the desired number of copy cycles have been completed notch 14 allows switch 13 to open, signalling the photoconductor advance circuitry to initiate a web feeding operation.

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Automatic Photoconductor Advance Control

U. S. Patent 3,600,086 describes a photocopy machine having a copy drum including an elongated photoconductive web, on which a predetermined number of copies are made on each of a plurality of successive web increments. The number of copies made on each increment are counted and an automatic advance circuit is energized when the predetermined number has been reached. A cam disc 10 is rotated in progressive small increments as driven by a synchronous motor 11, operated for a fixed period of time during each of a series of copy cycles. The accumulative rotation of disc 10 reflects the number of such copy cycles. When the desired number of copy cycles have been completed notch 14 allows switch 13 to open, signalling the photoconductor advance circuitry to initiate a web feeding operation. Actual advance of the photoconductor is primarily controlled by a metering roll, as described in U. S. Patent 3,600,086, that accurately measures a desired length of photoconductor to be advanced. The advance action is otherwise terminated if this measurement is not completed by a predetermined period of time. This predetermined period of time is conveniently measured by running motor 11 continuously, while switch arm 15 traverses the circumferential distance 12 of notch 14 in cam 10.

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