Browse Prior Art Database

Passive Paper Stop Fingers

IP.com Disclosure Number: IPCOM000039604D
Original Publication Date: 1987-Jul-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Billy, M: AUTHOR [+4]

Abstract

In a xerographic reproduction device, the problem of the paper stack shifting or moving in the device's duplex tray is solved by providing a number of passive paper stop fingers or fabric. These fingers are located so as to cooperate with the various different length papers that can be used in the reproduction device. (Image Omitted) The duplex tray is of the type having an air bearing underneath the paper stack. As a result, a small force can easily push the stack out of alignment. Figs. 1 and 4 are top views of the duplex tray. Figs. 2 and 3 are two side views of a stop finger. Fig. 4 shows the use of a pile fabric. Paper stop fingers 10 keep the stack from shifting away from reference edge 12, while allowing various paper sizes (see scale 13) to be used without operator intervention.

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Passive Paper Stop Fingers

In a xerographic reproduction device, the problem of the paper stack shifting or moving in the device's duplex tray is solved by providing a number of passive paper stop fingers or fabric. These fingers are located so as to cooperate with the various different length papers that can be used in the reproduction device.

(Image Omitted)

The duplex tray is of the type having an air bearing underneath the paper stack. As a result, a small force can easily push the stack out of alignment. Figs. 1 and 4 are top views of the duplex tray. Figs. 2 and 3 are two side views of a stop finger. Fig. 4 shows the use of a pile fabric. Paper stop fingers 10 keep the stack from shifting away from reference edge 12, while allowing various paper sizes (see scale 13) to be used without operator intervention. The paper stop fingers are mounted on a common shaft 14 (Figs. 2 and 3) which span the distance between the shortest and longest paper sizes. The shortest paper is too short to activate any of the fingers, while the paper is being stacked into the tray by stacker mechanism 15. During subsequent paper outfeed, if any stack shifting tends to occur, the paper stops against the first finger, preventing a further shift in paper position. If sequentially longer papers are used, some fingers are activated, as seen in Fig. 3, allowing paper to stack normally against fixed paper stops 16. If stack shifting tends to occur, the next finger which is not activated positively stops further stack shifting. After the last sheet is fed out of the duplex tray, the force of gravity returns the fingers to the unactivated posit...