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Sheet Paper Turnaround Aligner for a High Speed Paper or Document Feeder

IP.com Disclosure Number: IPCOM000062588D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Chandler, RO: AUTHOR [+2]

Abstract

A device is described to provide alignment of paper sheets at high speeds, at a sheet turnaround station, while maintaining sheet alignment. The device is illustrated in Fig. 1 and Fig. 2 in a configuration utilizing a document feeder. Documents placed in hopper 1 by an operator can be in a skewed state. The top sheet is picked off the stack by a belt vacuum plenum 2 and is fed into the subject aligner/turnaround mechanism 10. The document is fed between the drive roll 11 and a skewed backup roll (bur) 4, rotating in a clockwise direction. Relative to paper, the drive roll 11 is of a low friction material and bur 4 is of a high friction material. The resulting forces cause the sheet to rotate in its plane in a counterclockwise direction until the document contacts reference edge 3A of flanged roll 3.

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Sheet Paper Turnaround Aligner for a High Speed Paper or Document Feeder

A device is described to provide alignment of paper sheets at high speeds, at a sheet turnaround station, while maintaining sheet alignment. The device is illustrated in Fig. 1 and Fig. 2 in a configuration utilizing a document feeder. Documents placed in hopper 1 by an operator can be in a skewed state. The top sheet is picked off the stack by a belt vacuum plenum 2 and is fed into the subject aligner/turnaround mechanism 10. The document is fed between the drive roll 11 and a skewed backup roll (bur) 4, rotating in a clockwise direction. Relative to paper, the drive roll 11 is of a low friction material and bur 4 is of a high friction material. The resulting forces cause the sheet to rotate in its plane in a counterclockwise direction until the document contacts reference edge 3A of flanged roll 3. Flanged roll 3 is driven at approximately the same velocity as drive roll 11 and entry belt 2, resulting in less sheet edge damage and wear to the surface 3A of flanged roll 3. The sheet is then guided around in a right-hand turn by paper guides 12, into the nip point of flanged roll 3 and an align bur 5. Align bur 5 has a high normal load which prevents the paper from slipping. At the same time it has a lower surface friction (relative to paper) than the drive surface of flanged roll 3 and thus does not steer the paper. Flanged roll 3 is positioned so that reference surface 3A and the roll's dr...