Xerox Corporation

Douglas E Webb

Charles E Smith

Kevin Michael Carolan

Robert M Mara

Russell G Schroeder, Ii

James L Pratt

Charles J Mirabella, Jr

Frederick B Clark

Douglas W Buch

The present invention is a method and apparatus for modifying line synchronization signals that drive at least one secondary image exposure device in a multicolor printing or reprographic system. The ability to alter the line synchronization signals enables the accurate registration of a multiple color images on a photoconductor in response to detected photoreceptor motion. More specifically, the first color image is deposited on the photoreceptor using a servomotor control system to control photoreceptor velocity as a function of the desired raster line spacing, or the frequency at which the individual raster lines are deposited. All subsequently added colors in the single-pass printing system are added under the control of phase-locked loops, wherein the line synchronization pulses are produced as a function of the photoreceptor speed, to correct for variations from the nominal photoreceptor velocity.

Method and apparatus for adjusting a line synchronization signal in

A copier or printer connecting with a standard commercial electrical power line source and having a limited peak power consumption can still provide an electrically powered sheet stapling system by driving the stapler from an electrical storage battery power supply, the batteries of which are electrically connecting with an integral low voltage electrical power supply of the reproduction apparatus only for low power slow recharging. The stapler is operable for stapling sheets, powered solely by the storage batteries, even when the copier or printer, including its integral low voltage electrical power supply, is completely turned off, i.e., fully disconnected from the power line source. This stapler can also be operated when the reproduction machine is fully operating at its peak power consumption, including the operation of other, internal, stapling, because this stapler's operation does not increase that peak power consumption. Preferably this stapler and its battery power supply is part of an easily unplugable modular unit removably mountable on top of the machine for convenience stapling. Additionally, the stapler may be automatically prevented from further attempted stapling and thus further battery discharge when there is insufficient remaining battery power for fully effective stapling.

Reproduction apparatus with lower peak power requirement with integral

An apparatus in which an advancing copy sheet is disclosed. The apparatus includes a moving imaging member having a toner image thereon. The copy sheet contacts an imaging member to transfer a toner image from the imaging member to the copy sheet. A fusing member fuses the toner image to the copy sheet and advances the copy sheet at an adjustable velocity while the copy sheet receives the toner image from the imaging member. A controller communicates with the imaging member and the fusing member to maintain the velocity of the copy sheet with that of the imaging member. The velocity is maintained at a selected relationship. An imaging member drive moves the imaging member at a first velocity. The imaging member drive includes: a crystal clock that generates a fixed reference signal, a programmable divider which receives the signal and generates a control signal, and a servo motor responsive to the control signal. A fuser drive rotates the fuser roll to advance the sheet at a second velocity. The fuser drive includes: a voltage controlled oscillator that generates a signal responsive to the velocity differential between the imaging member drive and the fuser drive, a programmable divider which receives the signal from the voltage controlled oscillator and generates a control signal, and a servo motor responsive to the control signal. The controller includes a fixed frequency divider that receives a signal from the voltage controlled oscillator and generates a measurement signal as a function thereof.

Apparatus for controlling sheet velocity

Control and switching circuits for maintaining appropriate balance of light output of a long multi-vapor arc lamp. The control circuit includes sensing, amplifier-reference, phase amplitude detector, time base generator and lamp switching logic branches. The switching circuit includes a silicon controlled rectifier bridge for reversing the polarity of current flow through the lamp. The silicon controlled rectifier bridge is triggered by output pulse chains from the lamp switching logic branch in the control circuit.

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Fairport, NY, United States of America

Douglas E Webb