Electrophotography – Machine operation – Sequential control
Patent
1995-01-19
1997-05-06
Royer, William J.
Electrophotography
Machine operation
Sequential control
399394, G03G 2114, G03G 1500
Patent
active
056280424
ABSTRACT:
A solenoid-controlled sheet registration mechanism for a copier/printer includes registration fingers for registering the lead edge of a sheet before it is fed to the transfer station of the copier/printer, to receive a developed image from the photoreceptor. The mechanism also includes a pair of nip rolls for forwarding the sheet to the transfer station, after registration. Energization of the solenoid moves the registration fingers into the registration position and disengages the nip rolls. Conversely, release of the solenoid allows the registration fingers to return to a non-registration position and the nip rolls to return to paper-feeding engagement, both of those return movements taking place under a resilient bias. To soften the impact between the nip rolls as they re-engage, and so reduce any resulting noise, the release of the solenoid is controlled by applying a pulsed drive signal to the solenoid during the release period after the energizing signal has ceased.
REFERENCES:
patent: 4302093 (1981-11-01), Landa
patent: 4350329 (1982-09-01), Holzhauser et al.
patent: 4436404 (1984-03-01), Simmons et al.
patent: 4529188 (1985-07-01), Sturnick
patent: 4704655 (1987-11-01), Yamauchi
patent: 5085418 (1992-02-01), Rapkin et al.
EPO Search Report.
Kepner Kevin R.
Royer William J.
Xerox Corporation
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