Photocopying – Contact printing – Light boxes
Patent
1989-12-18
1991-02-19
Grimley, Arthur T.
Photocopying
Contact printing
Light boxes
355296, G03G 2100
Patent
active
049948636
ABSTRACT:
An electrostatic scavenger roller within the development apparatus of an electrostatographic copier or printer for recovering unwanted charged carrier particles (DPU) from the image-bearing surface of such copier or printer after development. The scavenger roller, which is mounted rotatably adjacent the image-bearing surface and within reach of first magnetic fields on the alternating pole magnets of a rotatable development roller, includes a magnetic drive disk at each end thereof. Each of the magnetic drive disks consists of a series of alternating pole magnets fixedly disposed inside the scavenger roller for rotation therewith, and each generates a second magnetic field which overlaps the first magnetic fields of the development roller. As such, rotation of the development roller magnetically induces rotation of the magnetic disks and, hence, rotation of the scavenger roller, thereby bringing the electrostatically recovered carrier particles (DPU) thereon, around and into the first magnetic fields for magnetic recapture by the magnetic development roller.
REFERENCES:
patent: 3457900 (1969-07-01), Drexler
patent: 3543720 (1970-12-01), Drexler
patent: 3659311 (1972-05-01), Waren
patent: 4043298 (1977-08-01), Swackhamer
patent: 4466728 (1984-08-01), Schlageter et al.
patent: 4482244 (1984-11-01), Yamazaki et al.
patent: 4671641 (1987-06-01), Kohyama
patent: 4674865 (1987-06-01), Tada et al.
Eastman Kodak Company
Grimley Arthur T.
Nguti Tallam I.
Ramirez Nestor R.
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