Xerox Corporation

Other

Roy W Rivers

Martin Edward Hoover

Kevin Michael Carolan

Peter J Mason

Orlando J Lacayo

Lawrence P Lavery

Gary L Hutchinson

Vernon Edmund Punt

Jerry K Whitfill

The printing apparatus according to the present invention includes a system for pre-warning of impending shutdown due to slippage of sheets within the printing apparatus sheet transport system. The system includes a plurality of sensors positioned along a sheet transport path for sensing sheets moving along the sheet transport path and a controller for determining an amount and location of slip within the sheet transport path by comparing outputs of the plurality of sensors. Once the location of the slip has been determined, automatic correction may be performed by the printing apparatus or manual correction may be performed by a service representative.

Method and apparatus for detecting slip in a sheet transport system

An imaging system for forming multiple superimposed image exposure frames on a photoconductive member moving in a process direction including a rotating polygon having a plurality of facets. A raster output scanner forms a plurality of scanlines in a transverse direction across the photoconductive member by reflecting modulated beams from the rotating polygon. A control provides a start of scan (SOS) signal for each of the facets of the rotating polygon, determines the facet related to the first scanline of a first image exposure frame on the photoconductive member, and initiates the first scanline of each succeeding superimposed image exposure frame on the photoconductive member in relation to the facet related to the first scanline of the first image exposure frame. Similarly, a time period measurement between a given facet occurrence to the same given facet repeat occurrence, relative to subsequent full revolutions of the polygon, provides an `error free` electronic representation of the speed of the polygon.

Polygon facet error effects elimination in multi-pass color systems

A gun cleaner has an elongated sleeve, a rod reciprocally mounted in the sleeve, a gun cleaning element attached to the rod, and mounting means attached to the sleeve for slidably guiding the rod along a major axis of the sleeve between a retracted position with the gun cleaning element at least substantially disposed within the sleeve and an extended position with the head and a portion of the rod extending outwardly from the end of the sleeve.

Gun cleaner

In a facsimile communication system transmitting a signal sequence indicative of a scan-by-scan reading of a document, the improvement including a scan interlock control system for matching the scan pitch rate in the receiver with the scan pitch rate in the transmitter. During each scan, the transmitter provides a scan synchronization pulse which is compared for coincidence with a receiver scan synchronization pulse. If a mismatch is found, the minimum bit width in a receiver scan counter is altered by a variable length counter towards a matching direction. The adjusted scan counter then provides the serial bits of data which, through a D/A converter, control the scanning mechanism in the receiver.

Scan interlock system

A facsimile transceiver apparatus is described which includes means for advancing a document to a station at which location the document is line scanned by a laser light beam. A video signal thus formed is transmitted to a remote facsimile apparatus for reproduction of the document. The transceiver further includes an electrostatographic printing station at which station a latent electrostatic image is formed by line scanning a laser light beam over a uniformly charged photoreceptor surface. A means for line scanning at the document scanning station and at the photoreceptor surface includes a laser light source and means for alternatively sweeping the laser light beam across the document at the scanning station or across a charged image retention surface at the printing station. Means are also described for enhancing document feed, resolution, and speed of reproduction.

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Geneseo, NY, United States of America

Roy W Rivers