Browse Prior Art Database

Copier Duplex Tray

IP.com Disclosure Number: IPCOM000034279D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 3 page(s) / 90K

Publishing Venue

IBM

Related People

Hopping, JM: AUTHOR [+2]

Abstract

A first-in, first-out (FIFO) duplex tray for use with a xerographic copier is disclosed. This tray includes a centrally located paper tray depression into which the front, mid portion of the lowermost sheet is drawn by a vacuum belt feeder. As a result of the bowing of this sheet, the two leading corners of the sheet may bow upward excessively, (Image Omitted) especially if the sheet is inherently curled. Generally horizontally blowing air jets are provided in the bottom of the paper tray, adjacent these two corners, such that the jet's moving air provides an air bearing under this lowermost sheet, and also pulls the sheet's front corners down and flat, by virtue of the Bernoulli forces associated with this moving air. Fig. 1 is a top view of the FIFO tray. Fig. 2 is a view from the right, and Fig.

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Copier Duplex Tray

A first-in, first-out (FIFO) duplex tray for use with a xerographic copier is disclosed. This tray includes a centrally located paper tray depression into which the front, mid portion of the lowermost sheet is drawn by a vacuum belt feeder. As a result of the bowing of this sheet, the two leading corners of the sheet may bow upward excessively,

(Image Omitted)

especially if the sheet is inherently curled. Generally horizontally blowing air jets are provided in the bottom of the paper tray, adjacent these two corners, such that the jet's moving air provides an air bearing under this lowermost sheet, and also pulls the sheet's front corners down and flat, by virtue of the Bernoulli forces associated with this moving air. Fig. 1 is a top view of the FIFO tray. Fig. 2 is a view from the right, and Fig. 3 is a front side view of the air knife. This arrangement provides a means for keeping the curly edges of paper 10 from causing paper jams. It flattens the paper against a fixed surface, and does not allow the otherwise curly paper to jam against paper guides in the copier's paper path. This application is used to restrain paper curl during out-feed of paper from the FIFO tray. Due to limited vertical space in the copier, the out-feed paper path 11, below the air knife 12, is compromised in the ability to handle curled sheets. This FIFO design aggravates this situation by pulling the center of the sheet down to seal against the vacuum transport belts 13, while supporting the sheet's leading corner at the higher level of the tray contours 14, 15. Contours 14, 15 are necessary as...