Minolta Company, Ltd.

Choichiro Tanigawa

Hiroyuki Fukuda

Chikara Tsutsui

Tetsuo Sano

Akihiro Nakamura

Yutaka Tsujishita

Mikihiko Sukeno

Senyu Taira

Yasunori Sakuda

This invention relates to a single component toner comprising specified polyester resins as binder resin and used in single-component developing system in which toner particles are electrically charged when passing through the opening between a toner-levelling member and a toner-transporting member positioned against a photosensitive member.

Single component toner comprising specified polyester

An air classifying system that can produce toner particles having a desired particle size is disclosed. The air classifying system contains a supplying pipe for supplying raw materials; a truncated cone-like breather pipe that has a ratio of minimal opening sectional area S.sub.1 to a maximum opening sectional area S.sub.0 being between 0.2 and 0.5, and an angle .theta. formed between axis and generatrix being between 10.degree. and 35.degree.; a classifying means for classifying the raw materials supplied through the supplying pipe; and an air flow-generating means for generating air-flow for transporting the raw materials in the classifying system.

Air classifier with specified truncated cone-like breather pipe

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Itami, Japan

Choichiro Tanigawa