Development apparatus using an electromagnet to prevent developm

Details Development apparatus using an electromagnet to prevent developm Development apparatus using an electromagnet to prevent developm

1990-09-26

1991-11-05

Grimley, A. T.

Photocopying

Contact printing

Light boxes

118656, 118658, 355251, 430122, G03G 1506

Patent

active

050634127

ABSTRACT:
An apparatus which develops a latent image recorded on a photoconductive member with developer material. The developer material is transported by a tubular member into a development zone. Developer material is attracted to the surface of the tubular member by a stationary magnet. In the operative mode, a weak magnetic field is formed in the development zone which releases the developer material from the surface of the tubular member so that the latent image attracts the developer material thereto. In the non-operative mode, an electromagnet is energized to decrease the magnetic field gradients in the development zone so as to decrease the tangential force on the surface of the tubular member preventing the developer material from moving therewith. The tubular member rotates in the opposite direction to the direction of rotation during development. With the electromagnet energized, the developer material moves with the tubular member away from the development zone to position the bare surface of the tubular member in the developing zone to prevent development of the latent image.

REFERENCES:
patent: 3257224 (1966-06-01), Jons et al.
patent: 4465356 (1984-08-01), Joseph et al.
patent: 4499851 (1985-02-01), Kopko et al.
patent: 4537494 (1985-08-01), Lubinsky et al.
patent: 4565437 (1986-01-01), Lubinsky
patent: 4641946 (1987-02-01), Forbes, II

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