Sheet feeding or delivering – Feeding – With means to align sheet
Patent
1988-04-18
1989-06-06
Kashnikow, Andres
Sheet feeding or delivering
Feeding
With means to align sheet
271248, 271252, B65H 916
Patent
active
048365270
ABSTRACT:
Side registration of a moving sheet against a registration bar or abutment line may be accomplished by a roll nip that is slightly angled toward the registration line, and is thereafter self-pivotable from that angle to one angle nearly in alignment with the direction of sheet travel. The roll nip is spring urged toward the angled position, and moves toward the alignment position in response to the reaction force of the sheet when it engages the registration bar. More specifically, side registration and deskewing of a delicate or flimsy sheet is provided by driving the sheet sideways (transversely) against a side registration edge guide in the sheet path while the sheet is primarily being driven downstream by a roller drive system comprising a mating pair of rollers on opposite sides of the sheet path to form a non-slip nip engagement of the sheet. The rollers are not skewed relative to one another. They are both mounted on an elongated pivotal arm unit over the sheet path so that the nip positioned well downstream in the sheet path from the pivot axis of the arm unit by a much greater distance than the transverse distance from the pivot axis to the nip and angled to the arm to provide a high ratio of downstream sheet driving force versus the sideways force. The arm unit's free pivotal movement range is restricted to only about 15.degree.. The arm unit is biased at an acute angle towards the edge guide but pivots within limits in response to driving a sheet in the nip.
REFERENCES:
patent: 3107090 (1963-10-01), Templeton et al.
patent: 3148877 (1964-09-01), Brearley
patent: 3175824 (1965-03-01), Albosta
patent: 4505471 (1985-03-01), Stockburger et al.
patent: 4621801 (1986-01-01), Sanchez
Anderson, G. D., "Paper Feed Aligner Mechanism"; IBM TDB; vol. 15; No. 4; Sep. 1972; p. 1253.
Beran, M. A.; "Backup Roller Mounting"; IBM TDB; vol. 22; No. 11; Apr. 1980; pp. 4833-4836.
Graham Matthew C.
Kashnikow Andres
Xerox Corporation
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