Browse Prior Art Database

FIFO Duplex Tray in a Copier

IP.com Disclosure Number: IPCOM000062630D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 88K

Publishing Venue

IBM

Related People

Billy, M: AUTHOR [+4]

Abstract

This first-in, first-out (FIFO) duplex tray accommodates sheets of different width, without the need for three registration walls to maintain the stack of sheets in an orderly stack as sheets are fed into and out of the tray. This duplex tray is used with a xerographic copier where copy images are placed on one side of a sheet, the sheet is stacked in the tray, and the sheet is returned to the copier's transfer station for second-side copying. A separator finger (not shown) is provided to separate a lower stack of sheets of one characteristic (for example, side-one copies of page 1) from an upper stack of sheets of another characteristic (for example, side-one copies of page 3). These two stacks of sheet types comprise the stack of sheets within the FIFO tray. Fig. 1 is a side view. Fig. 2 is a top view.

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FIFO Duplex Tray in a Copier

This first-in, first-out (FIFO) duplex tray accommodates sheets of different width, without the need for three registration walls to maintain the stack of sheets in an orderly stack as sheets are fed into and out of the tray. This duplex tray is used with a xerographic copier where copy images are placed on one side of a sheet, the sheet is stacked in the tray, and the sheet is returned to the copier's transfer station for second-side copying. A separator finger (not shown) is provided to separate a lower stack of sheets of one characteristic (for example, side-one copies of page 1) from an upper stack of sheets of another characteristic (for example, side-one copies of page 3). These two stacks of sheet types comprise the stack of sheets within the FIFO tray. Fig. 1 is a side view. Fig. 2 is a top view. The FIFO duplex tray comprises a substantially horizontal tray 10 having a serrated bottom wall 11 against which the bottom sheet in the tray rests, side-one image facing up. As shown, the serrated bottom surface is provided by a pair of insert plates 12 and 13. Serrations in these plates allow air to be forced out from under the bottom sheet in the stack after the previous sheet has been removed from the tray. Vacuum transport belts 14 grab the bottom surface of the bottom sheet of the stack, and operate to feed sheets out of the tray, one at a

(Image Omitted)

time, in FIFO fashion. An air knife assembly 15 blows pressurized air onto the left-facing edge of the sheet stack, thus aiding the vacuum transport belt in feeding only the bottom sheet. This air knife provides two-stage airflow, depending upon the height of the stack in the tray, i.e., more airflow is provided for a thick stack than for...