Recycle developing method and apparatus

Details Recycle developing method and apparatus Recycle developing method and apparatus

1995-08-28

1997-02-18

Beatty, Robert

Electrophotography

Image formation

Development

399 62, 399259, G03G 2100

Patent

active

056045760

ABSTRACT:
A recycle developing method utilizes the steps of (1) providing a developing vessel containing a starting developer composed of an electroscopic toner and a magnetic carrier; (2) transferring toner from the developing vessel to a photosensitive material having an electrostatic latent image formed thereon; (3) transferring a portion of the toner on the photosensitive material to a paper to form a toner image on the paper; (4) recovering toner remaining on the photosensitive material after the aforementioned portion of toner is transferred to the paper to form a toner image thereon; and (5) repeating steps (2)-(4) while replenishing toner in the developing vessel by the sub-steps of: (5a) supplying toner recovered in step (4) to the developing vessel, and (5b) supplying a virgin toner, having a higher chargeability than the electroscopic toner in the starting developer, to the developing vessel, to form a mixed toner in the developing vessel. An absolute value of the average charge quantity of the mixed toner is greater than the absolute value of the average charge quantity of the electroscopic toner in the starting developer plus 10 .mu.C/g. Apparatus to effect the process is also disclosed.

REFERENCES:
patent: 4768055 (1988-08-01), Takamatsu et al.
patent: 5066558 (1991-11-01), Hikake et al.
patent: 5289241 (1994-02-01), Sugiyama et al.
patent: 5307128 (1994-04-01), Murasaki et al.
patent: 5430530 (1995-07-01), Ott et al.
patent: 5493382 (1996-02-01), Takagaki et al.

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