Photocopying – Contact printing – Light boxes
Patent
1988-09-30
1990-01-16
Braun, Fred L.
Photocopying
Contact printing
Light boxes
355295, G03G 1514
Patent
active
048946877
ABSTRACT:
Electrostatic transfer imaging in which a latent electrostatic image is formed on a dielectric image roller, toned, and transferred to an image receptor medium. The dielectric roller contacts a transfer roller, and receptor sheets are fed between the two to receive toner images. Image transfer is effected with simultaneous fusing using high pressure between the rollers, which are skewed for enhanced efficiency of toner transfer. The rollers are skewed, preferably at an angle in the range 0.5 degree to 1.5 degree. Receptor sheets adhere to the surface of the transfer roller in preference to that of the image roller, thereby creating a relative motion between the dielectric surface and receptor sheet. This surface motion differential considerably improves the efficiency of toner transfer from the image roller to the receptor sheet, thereby reducing residual toner on the image roller.
REFERENCES:
patent: 4195927 (1980-04-01), Fotland et al.
patent: 4200389 (1980-04-01), Matsui et al.
patent: 4267556 (1981-05-01), Fotland et al.
patent: 4448872 (1984-05-01), Vandervalk
Braun Fred L.
Dennison Manufacturing Company
Moore Arthur B.
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