Processing head for electrophotographic apparatus

Details Processing head for electrophotographic apparatus Processing head for electrophotographic apparatus

1987-10-08

1989-01-10

Grimley, Arthur T.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

118662, G03G 1510

Patent

active

047976446

ABSTRACT:
A process head for use in an electrophotographic apparatus and adapted for conducting developing process with a developer on an electrophotographic film in a developing section of the electrophotographic apparatus. The developing section is surrounded by a seal section. An air pump is provided for supplying the seal section with a seal gas selectively at a low pressure higher than the pressure in the developing section and, hence, capable of preventing developer from leaking out of the developing section and a high pressure higher than the low pressure and high enough to drive the seal gas into the developing section. In consequence, leaking of developer out of the developing section is avoided and the seal gas under the high pressure comes into the developing section so as to ensure the complete removal of unnecessary portion of the developing agent.

REFERENCES:
patent: 3936854 (1976-02-01), Smith
patent: 4515463 (1985-05-01), Plumadore
patent: 4591543 (1986-05-01), Outsuka et al.
patent: 4622915 (1986-11-01), Ohtsuka et al.

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