Browse Prior Art Database

Paper Path Monitoring

IP.com Disclosure Number: IPCOM000087282D
Original Publication Date: 1977-Jan-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Eichhorn, TF: AUTHOR [+2]

Abstract

A transfer electrographic copier includes a copier paper path, and can include an original document paper path. A plurality of sensing switches sense the successful transport of paper along each such paper path. In the event of paper-path malfunction, such sensing switches supply suitable signals to paper-path control circuits which analyze the results of such signals. As a result, the operational status of the paper paths with respect to the operation of the copier is maintained by the paper-path control circuits.

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Paper Path Monitoring

A transfer electrographic copier includes a copier paper path, and can include an original document paper path. A plurality of sensing switches sense the successful transport of paper along each such paper path. In the event of paper-path malfunction, such sensing switches supply suitable signals to paper- path control circuits which analyze the results of such signals. As a result, the operational status of the paper paths with respect to the operation of the copier is maintained by the paper-path control circuits.

In the event of a malfunction commonly referred to as a jam, the transfer electrographic copier should be stopped. This stoppage is achieved by communication from the paper-path control circuits to other copier control circuits, which, in turn, stop the copier from producing copies. The sensing switches can be activated at all times or only during a copy production run. It is preferred that the sensing switches be used a minimal amount of time to avoid noise signals from falsely indicating improper copier paper-path operation.

Upon turning power on to the copier (POR), the copier checks whether or not copies have been left in the paper paths from a previous operation. For example, an emergency shutdown could cause paper to be left in one or more of the paper paths. Accordingly, a set of AND circuits, constituting a sense window generator, respond to the POR signal to sense whether or not sheets of paper are in the copier paper pa...