Browse Prior Art Database

POROUS ROLL DEVELOPMENT SYSTEM

IP.com Disclosure Number: IPCOM000023937D
Original Publication Date: 1979-Apr-30
Included in the Prior Art Database: 2004-Apr-01
Document File: 4 page(s) / 840K

Publishing Venue

Xerox Disclosure Journal

Abstract

This disclosure is directed to a liquid development process and apparatus and more specifically, to an improved ink or developer applicator system for the development of a charged image with liquid developers or toners.

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XEROX DISCLOSURE JOURNAL

POROUS ROLL DEVELOPMENT SYSTEM ProposedRichard C. Vock Classification

U.S. Cl, 355/10

mt. Cl. G03g 15/10

This disclosure is directed to a liquid development process and apparatus and more specifically, to an improved ink or developer applicator system for the development of a charged image with liquid developers or toners.

Porous roll liquid development is well known in the prior art In U.S. Patent No. 3,894,512, liquid developer is supplied to the back surface of a developer supply unit having uniformly distributed pores disposed therethrough, and a liquid developer applied to the back surface of the substrate is distributed on the front surface by the action of the electric field established by a latent image. In U.S. Patent No. 3,814,054, there is described a roll impregnated with a large amount of

Volume 4 Number 2 March/April 1979 257

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POROUS ROLL DEVELOPMENT SYSTEM (Cont'd)

a developer liquid, and the pressure of rolling causes the liquid to ooze out of the peripheral surface of the roll in small fixed quantities. With many of the foregoing development techniques and devices, it is difficult to obtain good clean print by developing latent electrostatic images without encountering substantial background development. In porous roll development, it is difficult to apply liquid developer or ink to the latent electrostatic image to be developed because of ineffective doctoring or because of lack of control over the amount of developer or developer vehicle which passes from the inside of the porous roll to the surface of the porous roll.

Liquid development devices and processes which require the application of a liquid developer or ink to a latent electrostatic image are well known in the prior art, and the present disclosure has applicability to most of these prior art processes and devices. For example, the present porous roll development process and device may be used in applying liquid developer or ink to a photoreceptor as described by R. W. Gundlach in U.~S. Patent No. 3,084,043. Gundlach discloses the use of lands and valleys and the containment of liquid developer within the valleys in such a manner that a liquid developer passes from the valleys to the charged areas of the photoreceptor in the area where the photoreceptor contacts the lands of the applicator roll. This type of system as described by Gundlach is a gravure~type liquid developer applicator system. The porous roll and porous belt devices of the present disclosure may be substituted for the gravure liquid developer applicator system of U.S. Patent No. 3,084,043.

Referring to the drawing, in Figure 1 there is shown a porous roll developer applicator, and in Figure 2 there is shown a porous belt developer applicator for applying a toner paste or liquid paste in the form of a liquid to an imaged surface such as a surface bearing a latent...