Position control apparatus for transfer drum in electrostatograp

Details Position control apparatus for transfer drum in electrostatograp Position control apparatus for transfer drum in electrostatograp

1991-04-19

1992-08-18

Grimley, A. T.

Photocopying

Contact printing

Light boxes

74384, 74395, 355272, 355277, 355279, 355327, G03G 2100

Patent

active

051403790

ABSTRACT:
In an electrostatographic printer and/or copier, toner images are transferred from the outer surface of a rotating image process drum to a receiver sheet carried on the outer surface of a rotating transfer drum as the respective drum surfaces pass through a transfer zone defined by a nip between the drums. To assure precise registration of the transferred toner image with a desired portion of the receiver sheet a planetary positional control apparatus is provided for adjusting the angular position of the transfer drum relative to that of the process drum as the transfer drum rotates to present the receiver sheet to the image transfer zone. Such apparatus responds to a control signal representing variations, from nominal, in the position of the toner image on the process drum and/or in the position of the receiver sheet on the transfer drum. The planetary positional control apparatus of the invention is particularly useful in color electrostatographic systems for precisely registering multiple color separation images on a receiver sheet.

REFERENCES:
patent: 3390632 (1968-07-01), Jahme
patent: 3516297 (1968-10-01), Dullinger
patent: 3947113 (1976-03-01), Buchan et al.
patent: 4541709 (1985-09-01), Kampschreur
patent: 4605298 (1986-08-01), Russel et al.
patent: 4705386 (1987-11-01), Ogita et al.
patent: 4872037 (1989-10-01), Kasahara et al.
patent: 4947209 (1990-08-01), Maeno et al.
patent: 4994827 (1991-02-01), Jamzadeh et al.
patent: 5021829 (1991-06-01), Johnson
patent: 5021835 (1991-06-01), Johnson

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