Closed loop magnetic brush development system

Details Closed loop magnetic brush development system Closed loop magnetic brush development system

1990-12-19

1991-12-31

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355245, 118657, G03G 1509

Patent

active

050775839

ABSTRACT:
A printing machine, such as a copier or a printer, is provided with an electrophotographic engine cartridge including a toner cartridge, a rotatable photoconductor drum, and a specially designed magnetic brush development module. The development module utilizes a rotating magnetic roller, disposed in a developer sump, to transport a toner carrier developer material toward a side surface portion of the rotating drum onto which the toner portion of the transported developer is electrically transferred. The development module is operated in a unique closed loop fashion by the action of a specially designed blade member which strips away the toner-depleted developer from the roller and causes it to enter a recycling well. The depleted developer is transferred from the recycling well into the developer sump wherein it is mixed with toner entering the sump from the toner cartridge, and then re-applied, in the form of reconstituted developer, to the magnetic roller for subsequent toner transfer to the rotating drum.

REFERENCES:
patent: 3947107 (1976-03-01), Smith
patent: 4583842 (1986-04-01), Shimono et al.
patent: 4731632 (1988-03-01), Fukushima et al.
patent: 4872036 (1989-10-01), Homma

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