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Browse Prior Art Database

OFFSET PRINTING METHOD

IP.com Disclosure Number: IPCOM000022872D
Original Publication Date: 1976-Mar-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 241K

Publishing Venue

Xerox Disclosure Journal

Abstract

Master imaging and printing steps are combined in a unitary housing to obviate the loss in image density and resolution caused by transfer of a developed image from a photorecep~ tor to a receiver member~

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XEROX DISCLOSURE JOURNAL

Q~~Printin Method Proposed Classification
Shigeru Sadamatsu U~S~C1~ 101/115

Into C1~ B41f 15/04

Master imaging and printing steps are combined in a unitary
housing to obviate the loss in image density and resolution
caused by transfer of a developed image from a photorecep~
tor to a receiver member~

The printing method comprises:

(a) overlaying a transparent insulating sheet on a photo~
sensitive member having a conductive substrate and a photo~
conductive layer;

(b) primary charging the surface of said member with a
charge having a polarity opposite to the majority carrier
transport capability of the photoconductive layer to form
a charge of opposite polarity at the interface between the
insulating sheet and the photoconductive layer;

(c) imaging said member with activating electromagnetic
radiation and immediately thereafter or simultaneously
therewith, secondary charging said member with a charge
having a polarity opposite to that of the primary charge;

(d) blanket exposing said photosensitive member to activa~
ting electromagnetic radiation;

(e) developing the latent image with a hydrophobic toner
and fixing said image to form a printing master;

(f) applying a conversion fluid on said master to render
it hydrophilic in the nonimaged areas;

(g) applying a hydrophilic fountain solution and hydro~
phobic ink to said master so as to ink only the imaged
areas;

(h) transferring the inked image to a blanket roll;

(1) transferring the image from the blanket ro...