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Hydrodynamic Ink Development Unit

IP.com Disclosure Number: IPCOM000082828D
Original Publication Date: 1975-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Hildenbrandt, LM: AUTHOR [+2]

Abstract

An improved ink development unit is designed for no physical contact with the photoconductor and includes other improvements.

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Hydrodynamic Ink Development Unit

An improved ink development unit is designed for no physical contact with the photoconductor and includes other improvements.

A previous ink development unit is illustrated in Fig. 1. This unit depends upon physical contact with the photoconductor for the development of the latent electrostatic image. A preferred amount of contact with the photoconductor is achieved when a 1/8'' to 3/16'' footprint is created on the photoconductor. The disadvantage of a contacting ink development system, is that it depends upon extreme accuracy and concentricity of the photoconductor drum and the ink development roll for minimum to no background on the copy. If the total indicated runout of either the drum or the ink development roll is greater than
0.002'', then background is inevitable.

To eliminate this, the ink development unit of Fig. 2 is useful. This unit depends upon the relative rotational speed difference of the ink development roll and the photoconductor drum, to create hydrodynamic ink pressure to develop the electrostatic latent image.

Several other features are incorporated in this unit to provide a greater latitude of control and development. Several types of ink rolls may be used: first and similar to the previous roll, a polyurethane rubber coated roll; second, a solid stainless steel roll. The solid steel roll serves as a conductive electrode ink development roll. This provides improved bias voltage control. Doctor blades are pr...