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DOCUMENT FEEDING DOG-EAR STRAIGHTENING SYSTEM

IP.com Disclosure Number: IPCOM000026389D
Original Publication Date: 1991-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 6 page(s) / 337K

Publishing Venue

Xerox Disclosure Journal

Abstract

The present disclosure relates to improved sheet feeding, with particular utility for document feeders or document handlers for sequentially feeding original document sheets, for reducing the tendency for sheet feeding jams, sheet damage, or sheet sensor misreads, or other difficulties where corners of a sheet being fed are or become curled, or folded over. (Folded over sheet corners are commonly referred to in the sheet handling art as "dog-eared").

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Page 1 of 6

XEROX DISCLOSURE JOURNAL

DOCUMENT FEEDING DOG-EAR Proposed Classification STRAIGHTENING SYSTEM U.S. C1.2711254 Barry P. Mandel Int. C1. B65h 09/04

FIG. I

XEROX DISCLOSURE JOURNAL - VoI. 16, No. 5 September/October 1991 293

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Page 2 of 6

DOCUMENT FEEDING DOG-EAR STRAIGHTENING S Y STE M(cont'd)

M

M

294 XEROX DISCLOSURE JOURNAL - Vol. 16, No. 5 September/October 1991

I 24

FIG. 2

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Page 3 of 6

DOCUMENT FEEDING DOG-EAR

STRAIGHTENING SY STEM(cont'd)

50

FIG. 3

XEROX DISCLOSURE JOURNAL - Vol. 16, No. 5 September/October 1991 295

[This page contains 1 picture or other non-text object]

Page 4 of 6

DOCUMENT FEEDING DOG-EAR STRAIGHTENING SYSTEM(cont'd)

The present disclosure relates to improved sheet feeding, with particular utility for document feeders or document handlers for sequentially feeding original document sheets, for reducing the tendency for sheet feeding jams, sheet damage, or sheet sensor misreads, or other difficulties where corners of a sheet being fed are or become curled, or folded over. (Folded over sheet corners are commonly referred to in the sheet handling art as "dog-eared").

Describing now in detail the specific examples illustrated in the Figures of the automatic dog-ear straightening apparatus 10 or 11, the Figs. 2 and 3 embodiment 11 will be described first. This is an example of typical sheet apparatus for feeding flimsy sheets of paper or the like in a sheet feeding direction through a sheet feeding path, which path in this Figs. 2 and 3 embodiment 11 is generally planer in the illustrated portion thereof, as opposed to the arcuate path of Fig. 1 embodiment 10. A sheet 21, which may have a dog-eared (folded-over) corner 25 is normally fed in the direction of the illustrated movement arrows by normal centrally engaging sheet feed rollers 22 (like the rollers 17 in Fig. 1) between baffles 23. The sheet is fed into nipped (engaging) pairs of generally cylindrical rotatably driven M brush rolls 24 and 26 on opposite sides of the path. The brush rollers 26 may be axially longer, as shown, to accommodate different sheet widths in the dimension transverse the sheet path. The sets of brush rollers 24 and 26 are mounted in a position to engage the corners of each sheet 21 moving through the system, and to unfold any folded over corners 25 of the lead edge corners of the sheet. The rotating brushes 24 and 26 are rotatably driven so that the periphery bristles are moving generally in the direction of sheet movement, but faster than the sheet movement. Also, the brushes 24 and 26 axes of rotation are preferably angled outwardly of the sheet path, such that the relative velocity vector 50, between the brush periphery and the sheet, is approximately 45 degrees, as shown here. Thus, a rotational brush surface velocity and angle to the direction of sheet movement is provided which will unfold any folded over leading corner...