Apparatus for controlling toner replenishment in electrostatogra

Details Apparatus for controlling toner replenishment in electrostatogra Apparatus for controlling toner replenishment in electrostatogra

1988-08-25

1990-03-13

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

118689, G03G 1508

Patent

active

049086669

ABSTRACT:
A toner replenishment control structure operates optimally for developer materials which exhibit toning contrast characteristics which vary predictably with the concentration of toner particles in the developer mix, and for developer materials which do not exhibit predictable changes in toning contrast as the toner concentration changes. An electrostatographic machine produces a contrast signal having a value proportional to toning contrast and a concentration signal having a value indicative of the ratio of toner to carrier in the mix, the concentration signal being substantially insensitive to the toning contrast. The system has a first state for actuating replenishment of toner of the first type according to the value of said contrast signal and a second state for actuating replenishment of toner of the second type according to the value of said concentration signal.

REFERENCES:
patent: 4226525 (1980-10-01), Sakamoto et al.
patent: 4468112 (1984-08-01), Suzuki et al.
patent: 4589762 (1986-05-01), De Schamphelaere
patent: 4607944 (1986-08-01), Rushing

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