Photocopying – Contact printing – Light boxes
Patent
1988-11-30
1990-08-21
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
355246, G03G 1509, G03G 1500
Patent
active
049510916
ABSTRACT:
An image forming apparatus includes a main charger and an exposure unit for forming an electrostatic latent image on a photosensitive drum, a developing unit for developing the latent image, a resupply unit for resupplying the developing unit with toner, an auto-toner sensor for detecting the concentration of the developing agent in the developing unit, a toner-empty mechanism for detecting the quantity of toner remaining in the resupply unit, and a display section for indicating the need for replenishment of the resupply unit with toner. If a shortage of toner in the resupply unit is detected by toner-empty mechanism, the display section displays a mark indicating the need to replenish the resupply unit, but does not interrupt a copying operation in progress, while if the auto-toner sensor detects that the concentration of the developing agent in the developing unit is below a predetermined value, the display section displays a message to the effect that the resupply unit should be replenished with toner, and stops the copying operation in progress.
REFERENCES:
patent: 4032227 (1977-06-01), Hubbard et al.
patent: 4579443 (1986-04-01), Abuyama et al.
patent: 4619514 (1986-10-01), Ide
Kabushiki Kaisha Toshiba
Pendegrass Joan H.
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