Browse Prior Art Database

ELECTROSTATIC PRINTING MACHINE

IP.com Disclosure Number: IPCOM000024299D
Original Publication Date: 1980-Apr-30
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 93K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a printing machine utilizing a printing plate passing through a trough of liquid developer wherein a voltage drop is placed across a developer electrode and the printing plate to attract charged pigment particles from the liquid developer to the plate.

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ELECTROSTATIC PRINTING MACHINE Proposed David D. Thornburg Classification

US. C1. 101/327

- Int. C1. B41f 31/00

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Disclosed is a printing machine utilizing a printing plate passing through a trough of liquid developer wherein a voltage drop is placed across a developer electrode and the printing plate to attract charged pigment particles from the liquid developer to the plate.

The printing machine 10 comprises a housing 12 within which are located a trough 14 of liquid developer 16, a rotatable drum 18, a nip roller 20 and a supply spool 22 of paper. The developer, similar to that used in conventional electrostatic printers, includes a solvent f hid with charged pigment particles dispersed therein. Mounted upon the rotatable drum 18 is the printing plate itself, which comprises a flexible conductive sheet (or flexible insulating sheet with a conductive coating) bearing an insulating material in the desired printing pattern. The insulating pattern may be prepared by coating the conductive sheet with a uniform layer of photopolymer and then imaging and developing the desired pattern in the photopolymer.

A variable voltage DC power supply 24 is shown with its negative terminal connected to the drum 18 and through a suitable commutator coupling (not shown) to the conductive surface of the printing plate and its positive terminal connected to a developer electrode in contact with the liquid developer. The electrode may be the developer trough 14 as shown.

In operatio...