Browse Prior Art Database

Resettable Long Duration Timer

IP.com Disclosure Number: IPCOM000079106D
Original Publication Date: 1973-May-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Cates, JA: AUTHOR

Abstract

A resettable, long-duration timer is utilized in an office copying machine to effect advancement of a photoconductor segment, when an approximate given number of copies have been produced on the device.

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Resettable Long Duration Timer

A resettable, long-duration timer is utilized in an office copying machine to effect advancement of a photoconductor segment, when an approximate given number of copies have been produced on the device.

The timer includes a microcoulometer 11 having a central gold electrode, an outer silver electrode which serves as the case, and an electrolyte. When an input current is applied to terminal 13, the positive silver ions in the electrolyte are deposited on the gold electrode and the voltage drop across the cell is low - in the order of a few millivolts. When current is applied in the opposite direction, the cell voltage remains low until the silver is depleted from the gold electrode, at which time the voltage rises from a few millivolts to several hundred millivolts. Accordingly, a pulse of a desired duration is applied to input terminal 15 after each copy is made, thereby depleting the amount of silver on the gold electrode. When the desired approximate number of copies have been made, the gold electrode becomes depleted and provides an output signal at terminal 17, which can be utilized to effect advancement of a further photoconductor segment.

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