Automatic toner control

Details Automatic toner control Automatic toner control

1979-08-09

1981-05-05

Weinblatt, Mayer

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Post imaging process, finishing, or perfecting composition...

430120, 118691, 118712, 118657, G03G 1508

Patent

active

042659973

ABSTRACT:
In a system for developing electrostatic images on a moving photoconductive support by contact with a brush of two-component developer powder carried on a moving surface, in which the toner content of the powder is controlled in response to optical sensings of the reflectance of the brush at a location just beyond the developing zone, objectionable fluctuations of the toner concentration are avoided by shaping the developer brush to a constant layer thickness, for instance by reducing its thickness to about 0.5 to 0.6 mm, as the brush is being transported from the developing zone so that the sensings of the reflectance will occur at a constant distance from the brush. As an aid for adjusting or checking the operation of the toner control system, a reference surface having the same reflectance as a developer layer of the prescribed thickness and toner concentration is inserted in place of the brush at the location where reflectance is sensed.

REFERENCES:
patent: 3567923 (1971-03-01), Hutchison
patent: 4064833 (1977-12-01), Gluck et al.
patent: 4081571 (1978-03-01), Nishihama et al.
patent: 4112870 (1978-09-01), Extra et al.

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