Global Patent Index - EP 0819993 A1

EP 0819993 A1 1998-01-21 - A developing apparatus and an image forming apparatus

Title (en)

A developing apparatus and an image forming apparatus

Title (de)

Entwicklungs- und Bilderzeugungsgerät

Title (fr)

Appareil de développement et appareil de formation d'images

Publication

EP 0819993 A1 (EN)

Application

EP 97111965 A

Priority

JP 18485596 A

Abstract (en)

A developing apparatus comprises a magnet roller (45) for supplying a developing agent consisting of toner and a carrier to a portion to be developed, an upper screw (42) opposed to the magnet roller (45), for stirring/transporting the developing agent in a first direction, and a lower screw (43) provided below the upper screw (42) in parallel with the upper screw (42), for receiving/transporting the developing agent from/to the upper screw (42) and for sending the developing agent to the magnet roller (45), while stirring/transporting the developing agent in a second direction opposite to the first direction. The magnet roller (45) includes a supply portion (45a) having a plurality of magnetic poles (53a to 53e) arranged in a first magnetic pole arrangement, for supplying the developing agent to the portion to be developed, and a transport portion (45b) having a plurality of magnetic poles (55a to 55e) arranged in a second magnetic pole arrangement different from the first magnetic pole arrangement, for transporting the developing agent transported by the lower screw (43), to the upper screw (42). <IMAGE>

IPC 1-7 (main, further and additional classification)

G03G 15/08; G03G 15/01; G03G 15/09

IPC 8 full level (invention and additional information)

G03G 15/08 (2006.01); G03G 15/09 (2006.01)

CPC (invention and additional information)

G03G 15/0921 (2013.01); G03G 15/0822 (2013.01); G03G 2215/0119 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

DOCDB simple family

EP 0819993 A1 19980121; CN 1172288 A 19980204; JP H1031363 A 19980203