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Active Output Tray

IP.com Disclosure Number: IPCOM000033733D
Publication Date: 2004-Dec-23
Document File: 1 page(s) / 10K

Publishing Venue

The IP.com Prior Art Database

Abstract

This disclosure describes an active output tray that changes shape to accommodate curl in the sheets as they exit the copier/printer. Sheets, as they leave the copier/printer, can assume a curl where the curvature is at right angles to the process direction. This curl can be up or down. If the curl is down the sheets will form a reasonable stack in the output tray. If the curl is up the sheets form an untidy stack where the curled sheets either obstruct the copier/printer exit or makes the tray full sensor prematurely. Bail arms can be added to help the up curled sheets stack but this does not work on slow process speed copier/printer's or small paper sizes as the drag from the bail arms makes the sheets stop too quickly. An alternative is to use a "broken back tray". Here the upper face of the tray that receives the sheets is no longer flat but curved, being higher in the middle. This causes the up curled sheets to "break their backs" and make a flatter and tidier stack.

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Active Output Tray

This disclosure describes an active output tray that changes shape to accommodate curl in the sheets as they exit the copier/printer.  Sheets, as they leave the copier/printer, can assume a curl where the curvature is at right angles to the process direction.  This curl can be up or down. If the curl is down the sheets will form a reasonable stack in the output tray. If the curl is up the sheets form an untidy stack where the curled sheets either obstruct the copier/printer exit or makes the tray full sensor prematurely.  Bail arms can be added to help the up curled sheets stack but this does not work on slow process speed copier/printer’s or small paper sizes as the drag from the bail arms makes the sheets stop too quickly.  An alternative is to use a “broken back tray”.  Here the upper face of the tray that receives the sheets is no longer flat but curved, being higher in the middle.  This causes the up curled sheets to “break their backs” and make a flatter and tidier stack. 

Curling of the sheet is worse in some environments.  Hot wet is one of the worst environments as the sheets absorb moisture and curl more as they pass through the copier/printer.  What is needed is a tray where the receiving face changes shape following the environment that the copier/printer is being operated in.  Some ways of achieving this are described below:

·          The receiving face could be hinged in the middle via a bi-metallic strip. This would bend when he...