Solid metering roll

Details Solid metering roll Solid metering roll

1979-05-21

1981-02-03

Beha, Jr., William H.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

G03G 1510

Patent

active

042485223

ABSTRACT:
A metering roll, employed between the developing station and the transfer station of a photocopier which uses a liquid toner, controls the thickness of the liquid on the photosensitive drum surface when it is presented to the transfer station. The metering roll has a central metering portion and a distance control position at each end. The metering portion and the distance control portions are coaxial and have a fixed angular relationship with respect to each other. The metering roll distance control portions are urged against the moving copier photosensitive drum surface and rotate in the same angular direction as the drum. Thus the distance control portions engage drum surface edges in a sliding frictional relationship. The distance control portions are sized to maintain the central metering portion in a substantially constant spaced apart relationship to the drum surface and thereby tend to limit and control the thickness of developer on the drum surface at the transfer station. A neck portion adjacent the central metering portion at each of its ends helps to prevent buildup of developer fluid on the distance control portions.

REFERENCES:
patent: 1364043 (1920-12-01), Dixon
patent: 1404589 (1922-01-01), Dixon et al.
patent: 2991753 (1961-07-01), Dearsley
patent: 3245377 (1966-04-01), Gettel
patent: 3907423 (1975-09-01), Hayashi et al.
patent: 3957016 (1976-05-01), Yamada et al.
patent: 4023899 (1977-05-01), Hayashi et al.
patent: 4052959 (1977-10-01), Hayashi et al.
patent: 4056315 (1977-11-01), Ariyama et al.

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