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FRICTION RETARD FEEDER WITH NIP IDLER ROLL

IP.com Disclosure Number: IPCOM000026110D
Original Publication Date: 1990-Jun-30
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 70K

Publishing Venue

Xerox Disclosure Journal

Abstract

Friction retard paper feeders with a large capacity (500sheets) supply tray adjacent the feeder are subject to a large angle of swing of the top sheet. Figure 1 illustrates this swing of trajectory from the full stack position to the empty stack position with the steepest angle of approach of the top sheet to the retard pad being from the full tray which creates the opportunity for the paper to stub against the retard pad because of the steep angle especially if the sheet has any downward curl. Figure 2 illustrates a way in which the top sheet can be controlled and guided into the retard nip at the appropriate constant angle. In Figure 2 a nip idler roll 14 is added to the feeder which is in contact with and driven by the feed roll 10 and upstream of the retard pad 12 The idler nip roll contacts the feed roll and creates an active control nip to guide the sheet lead edge at the optimum angle to the retard zone regardless of the paper trajectory off the stack, Even if the sheet hits the idler roll low the rotating idler roll carries and guides it upward into the active nip.

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XEROX DISCLOSURE JOURNAL

FRICTION RETARD FEEDER WITH NIP IDLER ROLL U.S. C1.271/010 Donato D. Evangelista

Proposed Classification

Int. C1. B65h 5/00

12

FIG. I

"y

FIG. 2

XEROX DISCLOSURE JOURNAL - Vol. 15, No. 3 May/June 1990 129

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FRICTION RETARD FEEDER WITH NIP IDLER ROLL(Contld)

Friction retard paper feeders with a large capacity (500sheets) supply tray adjacent the feeder are subject to a large angle of swing of the top sheet. Figure 1 illustrates this swing of trajectory from the full stack position to the empty stack position with the steepest angle of approach of the top sheet to the retard pad being from the full tray which creates the opportunity for the paper to stub against the retard pad because of the steep angle especially if the sheet has any downward curl. Figure 2 illustrates a way in which the top sheet can be controlled and guided into the retard nip at the appropriate constant angle. In Figure 2 a nip idler roll 14 is added to the feeder which is in contact with and driven by the feed roll 10 and upstream of the retard pad 12 The idler nip roll contacts the feed roll and creates an active control nip to guide the sheet lead edge at the optimum angle to the retard zone regardless of the paper trajectory off the stack, Even if the sheet hits the idler roll low the rotating idler roll carries and guides it upward into the active nip.

130 XEROX DISCLOSURE JOURNAL - Vol. 15, No. 3 May...