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DOCUMENT SET SEPARATOR WITH FINGER ROTATING INTO THE PAPER PATH IN THE PLANE OF THE MOVING PAPER

IP.com Disclosure Number: IPCOM000027614D
Original Publication Date: 1998-Apr-30
Included in the Prior Art Database: 2004-Apr-08
Document File: 2 page(s) / 107K

Publishing Venue

Xerox Disclosure Journal

Abstract

Set separators are widely used in recirculating document handlers and in the duplex buffer trays of copiers to separate and count the circulations of the sets of sheets and/or provide a miscount or jam detection signal by a finger dropping to actuate a switch when the last sheet is fed out from under the separator set finger, as described, for example, in U.S. 4,589,654 issued May 20, 1986 to Michael J. Tracey and other references cited therein. Another set separator that rotates in a horizontal plane, which may be employed in a duplex buffer tray for duplex purposes is shown in U.S. 4,116,558 issued Sept. 26, 1978; and 4,210,319 issued July 1, 1980 to Frank R. Hynes.

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XEROX DISCLOSURE JOURNAL

DOCUMENT SET SEPARATOR WITH FINGER ROTATING INTO THE PAPER PATH IN THE PLANE OF THE MOVING PAPER
James D. Walsh

Proposed Classification
U. S. C1. 27 U003.1 Int. Cl. B65h 7/14

Set separators are widely used in recirculating document handlers and in the duplex buffer trays of copiers to separate and count the circulations of the sets of sheets and/or provide a miscount or jam detection signal by a finger dropping to actuate a switch when the last sheet is fed out from under the separator set finger, as described, for example, in U.S. 4,589,654 issued May 20, 1986 to Michael J. Tracey and other references cited therein. Another set separator that rotates in a horizontal plane, which may be employed in a duplex buffer tray for duplex purposes is shown in U.S. 4,116,558 issued Sept. 26, 1978; and 4,210,319 issued July 1, 1980 to Frank R. Hynes.

Typically, the finger is pulled out from under the said aperture when the last sheet thereunder is fed out of the tray and the finger is then reset by a solenoid or other drive on top of the stack in the tray. However, in a high speed machine, the timing of this motion of the set separator finger for resetting is critical in order to avoid copy miscounts. The finger must land on top of the last sheet of the next job and prior to the first sheet of the subsequent job set entering the tray. With a motion of the finger perpendicular to the paper motion, the time from the last sheet entering the tray of one set and the frrst sheet of the next set entering the tray is a small time window. That time window is even smaller by the time delay allowed for the settling time of the last sheet onto the top of the stack. That settling time can be increased or even prevented because of curling of the paper sheet or damage thereto. Inadequate settling time or curled or damaged sheets can cause the finger to land under the last sheet of a print job rather than on top of that last sheet.

In the set separ...