Development rate controller

Details Development rate controller Development rate controller

1990-02-01

1991-01-22

Moses, R. L.

Photocopying

Contact printing

Light boxes

355251, 355 77, 355203, 355208, 118657, G03G 1509

Patent

active

049874535

ABSTRACT:
Apparatus and method for controlling the development rate of an electrostatic photocopying machine. An electrode plate is positioned adjacent to the toning brush to form a capacitive circuit in which a portion of the dielectric is the toner mixture used in developing images in the machine. Reversing polarities are applied to the electrode plate to alternately make it attract and repel toner. During the attracting or developing polarity, the transient behavior of the toning current is detected and this transient response is used to determine the development rate of the apparatus. In the specific embodiment described, the transient characteristic detected is the time required for the charging current to decay to a predetermined value.

REFERENCES:
patent: 4382420 (1983-05-01), Ohnuma et al.
patent: 4678317 (1987-07-01), Grossinger
patent: 4706032 (1987-11-01), Allen et al.
Japanese patent application abstract, No. 62-299676, priority date Nov. 30, 1987.
R. M. Schaffert, Electrophotography, Focal-Press, London, 1975, pp. 574-576.

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