Photocopying – Contact printing – Light boxes
Patent
1990-06-04
1991-06-04
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
355317, 355326, 346157, G03G 1516, G03G 1501
Patent
active
050218352
ABSTRACT:
Multicolor toner images are formed on a receiving sheet by superimposing single toner color images formed electrostatically on an image member, in registration on the receiving sheet. The receiving sheet is carried by a transfer roller repeatedly through engagement with the image member. The transfer roller is held slightly out of engagement with the image member when no receiving sheet is between the roller and image member. When a receiving sheet is between the roller and image member the roller is driven through the receiving sheet by the image member. To improve registration, the transfer roller is reindexed between transfer of each image by a stepper motor which rotates the transfer roller when no sheet is present between the transfer roller and the image member.
REFERENCES:
patent: 4605298 (1986-08-01), Russel et al.
patent: 4796054 (1989-01-01), Maeno et al.
patent: 4872037 (1989-10-01), Kasahara et al.
US07/519,999, Johnson and Zeman filed May 7, 1990, "Multiple Image Forming Apparatus and Transfer Roller".
US07/519,998, Johnson and Shoup g filed May 7, 1990, "Image Forming Apparatus and Transfer Roller Reindexing Mechanism".
Eastman Kodak Company
Pendegrass Joan H.
Treash, Jr. Leonard W.
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