Impression roller and method of preparation

Details Impression roller and method of preparation Impression roller and method of preparation

1992-01-23

1993-01-12

Burr, Edgar S.

Printing

Processes

Electric or magnetic transfer

101153, 101DIG37, B41M 100, B41F 900

Patent

active

051780712

ABSTRACT:
An impression roller for an electostatic printing assist system consists of a metal roller core, a relatively thick insulating layer of substantially uniform thickness covering the main body of the core, a relatively thin intermediate conductive layer covering the insulating layer and a relatively thick semiconductive layer covering the intermediate layer. The relatively thin conductive layer is exposed at one end of the roller so it can make contact with a rotary transformer. In a first embodiment of the invention the roller core is tapered at one end and the slope of the tapered end built up with semiconductive material. In a second embodiment there is an annular groove which is cut into the conductive layer to provide improved contact with a transformer. A method of preparing rollers is also disclosed.

REFERENCES:
patent: 4364313 (1982-12-01), Hyllberg
patent: 4513660 (1985-04-01), Brands et al.
patent: 4539908 (1985-09-01), Spengler
patent: 4966555 (1990-10-01), Zagorski
patent: 5044275 (1991-09-01), Knopf et al.
The Eltex brochure dated May 10, 1990.

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