Photocopying – Contact printing – Light boxes
Patent
1990-12-21
1991-10-01
Grimley, A. T.
Photocopying
Contact printing
Light boxes
101408, 271204, G03G 1514
Patent
active
050538268
ABSTRACT:
A method and apparatus for synchronizing a transfer loop in a recirculating color printer includes two spaced pairs of pulleys having a conveyor belt positioned thereabout for conveying sheets to a transfer zone for image transfer and an external pair of idler pulleys. A gripper bar on the conveyor belt advances the sheet. A photoconductive drum includes a portion in the transfer zone. A corona generating device is located in the transfer zone to charge the sheet so that it will attract an image from the photoconductive drum. A motion control servo provides ground-referenced control of motion of the conveyor belt as the gripper bar is delivered to the transfer zone. In the transfer zone, control is shifted to a phase detector which maintains constant the initially sensed phase between idler pulleys and a photoconductive drum coaxial therewith. When the gripper bar has exited the transfer zone, control of the conveyer belts reverts to a ground based system and the velocity is maintained the same as it was with the gripper bar in the transfer zone. After the trailing portion of the sheet exits the transfer zone, a length compensation cycle begins which adjusts gripper bar position in accordance with length differences between the conveyor belt and photoconductive drum.
REFERENCES:
patent: 3275318 (1966-10-01), Lavander
patent: 3924849 (1975-12-01), Murakami
patent: 4447146 (1984-05-01), Kogane et al.
patent: 4552448 (1985-11-01), Davidson
patent: 4733269 (1988-03-01), Kasahara et al.
patent: 4781370 (1988-11-01), Weisgerber
patent: 4799664 (1989-01-01), Burger
patent: 4849795 (1989-07-01), Spehrley, Jr. et al.
patent: 4875069 (1989-10-01), Takada et al.
patent: 4914482 (1990-04-01), Ammenheuser et al.
patent: 4972234 (1990-11-01), Tanaka et al.
patent: 4977828 (1990-12-01), Douglas
Castelli Vittorio R.
Chai Stephen T.
Grimley A. T.
Hoffman Sandra L.
Xerox Corporation
LandOfFree
Transfer loop synchronization in recirculating color printers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transfer loop synchronization in recirculating color printers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transfer loop synchronization in recirculating color printers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1758633