Image forming apparatus for controlling developer to be replenis

Details Image forming apparatus for controlling developer to be replenis Image forming apparatus for controlling developer to be replenis

1988-07-21

1990-02-20

Evans, Arthur G.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

355246, G01J 1500

Patent

active

049030515

ABSTRACT:
A laser printer includes a plurality of lenses and mirrors for scanning a laser beam to form an optical image on a photoconductive drum, a developing unit for storing a developer for developing an electrostatic latent image formed on the drum by the plurality of lenses and mirrors, and an image transfer section for transferring the image developed by the developing unit onto paper. The developer is a two-component developer consisting of a toner and a carrier. The toner densities of toner adhered to a toner hopper for replenishing the toner stored in the developing unit and of that adhered to a toner density detecting probe coaxially attached to the drum are measured by utilizing a light-emitting diode and a photodiode. In a CPU, a toner density measured by the light-emitting diode and the photodiode is compared with a first reference value, and then the measured density value is compared with a second reference value which is smaller than the first reference value. When the measured density value is smaller than the first reference value, the replenishment toner is controlled to be replenished from the toner hopper to the developing unit. When the measured density value is smaller than the second reference value, the CPU stops the image forming operation, and at the same time, informs that the replenishment toner in the toner hopper is empty using an operation display section.

REFERENCES:
patent: 4491875 (1985-01-01), Kanamura
patent: 4647180 (1987-03-01), Watanabe
patent: 4647950 (1987-03-01), Nosaki et al.

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