Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1981-10-01
1983-03-15
Moses, R. L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
152565, 118652, 355 3DD, G03G 2100
Patent
active
043765785
ABSTRACT:
An electrographic copying machine of the powder image transfer type in which a channel for transporting the developer recovered by a cleaner to a developing unit includes an assembly for removing foreign matter from the developer. The developing unit is adapted to develop latent electrostatic images with a magnetic developer which is a mixture of finely divided insulating toner and a magnetic carrier having small size particles and a resistivity of at least 10.sup.13 ohm-cm. The assembly has a nonmagnetic hollow cylindrical member for guiding the developer, a magnetic transport member disposed within the cylindrical member for transporting the developer, a foreign matter removal opening formed in the lower wall of the cylindrical member, and magnets for forming a magnetic field for attracting the magnetic carrier contained in the portion of the developer positioned in the vicinity of the opening upwardly in the cylindrical member.
REFERENCES:
patent: 3678896 (1972-07-01), Hewitt
patent: 4011835 (1977-03-01), Lewis
patent: 4323306 (1982-04-01), Ito et al.
patent: 4325628 (1982-04-01), Torigai et al.
Oka Tateki
Tanaka Susumu
Minolta Camera Kabushiki Kaisha
Moses R. L.
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