Developing device having a feeding screw with multiple blade portions

A developing device includes a developer carrying member, a first chamber, a second chamber, a first communicating portion, a second communicating portion, and a feeding screw, provided in the second chamber, including a feeding portion having a first helical blade and including a returning portion...

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Bibliographic Details
Main Authors Tsuda, Shunsuke, Ootsuka, Masahiro, Saito, Fumiyoshi, Ariizumi, Osamu, Arakawa, Mitsuyoshi
Format Patent
LanguageEnglish
Published 05.05.2020
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:A developing device includes a developer carrying member, a first chamber, a second chamber, a first communicating portion, a second communicating portion, and a feeding screw, provided in the second chamber, including a feeding portion having a first helical blade and including a returning portion having a second helical blade in the form of a plurality of threads, the feeding portion and the returning portion being provided so that a boundary portion therebetween opposes the second communicating portion. The first helical blade and the second helical blade satisfy the following relationship: P2≥P1, where P1 is a pitch, or lead, of the first helical blade and P2 is a lead of the second helical blade.
Bibliography:Application Number: US201815982023