Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1979-01-11
1981-02-24
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
134 1, 198690, 355 3DD, 430125, G03G 1500, G03G 1509, G03G 1309
Patent
active
042524342
ABSTRACT:
A method and apparatus for conveying developing agent for use in an image forming apparatus, in which a magnetic developer is placed under the influence of a forcing magnetic field, then the developer restrained by the forcing magnetic field is caused to pass through a slit-passageway having a narrowing clearance, thereafter the developer is pushed out into a conveying path by reducing the intensity of the forcing magnetic field to the developer which has passed through the minimum clearance in the slit-passageway below the magnetic field in the minimum clearance section of the slit-passageway, and finally the developer which has been pushed out into the conveying path is moved in and through the conveying path by being further pushed by subsequently transported developer. The apparatus is basically constructed with a magnetic developer conveying device having a magnetic power source to impart moving force to the magnetic developer, and a guide member disposed adjacent to the magnetic developer conveying device to guide the magnetic developer in substantially an upward direction.
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patent: 3951542 (1976-04-01), Ito et al.
patent: 3983841 (1976-10-01), Norton
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patent: 4008686 (1977-02-01), Katakura et al.
patent: 4097140 (1978-06-01), Suzuki et al.
patent: 4131357 (1978-12-01), Forbes
Nakamura Shunji
Toyono Tsutomu
Braun Fred L.
Canon Kabushiki Kaisha
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