Paper feeder

Details Paper feeder Paper feeder

2005-06-21

2010-10-26

Coles, Edward L (Department: 2625)

Facsimile and static presentation processing

Facsimile

Picture signal generator

C271S004020, C271S004030, C271S004080

Reexamination Certificate

active

07821686

ABSTRACT:
A paper feeder employs a retard roll mounted on a shaft that is controlled by a magneto rheological variable clutch. Current is adjusted to the magneto rheological variable clutch to produce a variable drag torque (from near zero to fully locked) on the retard roll. The current is adjusted based on various inputs, some of which include media type, temperature, humidity, media size, and transport speed. Variable drag on the retard roll results in a reduction in induced skew of sheet passing through a nip formed between the retard roll and a separation roll, as well as, less and more consistent wear of the retard roll.

REFERENCES:
patent: 3905458 (1975-09-01), Mehrbrodt
patent: 3934690 (1976-01-01), Janning
patent: 5435538 (1995-07-01), Billings et al.
patent: 5443359 (1995-08-01), Miller et al.
patent: 5906767 (1999-05-01), Karol et al.
patent: 6059279 (2000-05-01), Wenthe, Jr.
patent: 6595512 (2003-07-01), de Koning et al.
patent: 7036815 (2006-05-01), Yamamoto

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