Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1982-09-29
1984-05-15
Kittle, John E.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430 98, 355 24, G03G 1314
Patent
active
044488726
ABSTRACT:
Method and apparatus for duplex electrostatic imaging wherein a toner image is transferred and simultaneously fixed to two sides of a receptor medium using high pressure. The first toner image is created on a dielectric image roller and pressure transferred to a transfer roller moving at an identical surface velocity. A second toner image is subsequently formed on the image roller, and the two images are simultaneously transferred and fused to opposite sides of a receptor sheet at the nip. The image roller advantageously includes a hard, very smooth dielectric surface, while the transfer roller has a moderately smooth, compliant surface. The transfer roller surface preferably comprises an engineering thermoplastic or thermoset material characterized by a relatively low coefficient of friction in order to provide high transfer efficiency to the receptor sheet. The duplex imaging apparatus may be incorporated into electrostatic printers and copiers with suitable adaptations in the image generating stages.
REFERENCES:
patent: 3591276 (1971-07-01), Byrne
patent: 3669706 (1972-06-01), Sanders et al.
patent: 3697171 (1972-10-01), Sullivan
patent: 3854975 (1974-12-01), Brenneman et al.
patent: 3932035 (1976-01-01), Sato et al.
Delphax Systems
Goodrow John L.
Kittle John E.
Moore Arthur B.
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