Browse Prior Art Database

Duplexing Copier

IP.com Disclosure Number: IPCOM000051513D
Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 3 page(s) / 121K

Publishing Venue

IBM

Related People

Overton, GB: AUTHOR [+2]

Abstract

Paper is neatly stacked in a copier's duplex tray by the use of a pair of flexible rubber paddles. U. S. Patent 4,175,741 describes such a copier wherein, with reference to Fig. 1, paper bearing side-one copy is stacked into duplex tray 10, one sheet at a time, as the sheets serially enter the tray by passing through the unobstructed space between friction feed assembly 11 and combing wheel feed assembly 12. At the time of feed-in, assembly 12 is elevated; i.e., it is elevated by rotating counterclockwise about pivot shaft 13. In order for reliable feed-out to occur by way of assemblies 12 and 11 and sheet guides 14 and 15 for side-two copying, the side-one copies must reside within tray 10 in a neat stack which is corner-registered to the 90 degrees corner defined by tray walls 16 and 17.

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Duplexing Copier

Paper is neatly stacked in a copier's duplex tray by the use of a pair of flexible rubber paddles. U. S. Patent 4,175,741 describes such a copier wherein, with reference to Fig. 1, paper bearing side-one copy is stacked into duplex tray 10, one sheet at a time, as the sheets serially enter the tray by passing through the unobstructed space between friction feed assembly 11 and combing wheel feed assembly 12. At the time of feed-in, assembly 12 is elevated; i.e., it is elevated by rotating counterclockwise about pivot shaft 13. In order for reliable feed-out to occur by way of assemblies 12 and 11 and sheet guides 14 and 15 for side-two copying, the side-one copies must reside within tray 10 in a neat stack which is corner-registered to the 90 degrees corner defined by tray walls 16 and 17.

The additional apparatus shown in Fig. 2, and particularly its paddles 18 and 19, accomplishes this result. Fig. 2 is a view from the left in Fig. 1. Tray 10 is not shown in Fig. 2.

As explained in the above-mentioned U. S. patent, shaft 13 rotates continuously in a clockwise direction, as seen in Fig. 2. Solenoid 20 is energized only when paper is to be fed out of the duplex tray. Energization of this solenoid lowers combing wheel 21 down onto the top of the stack of side-one copies. When the solenoid is not energized, spring 22 maintains the combing wheel in a raised position so that side-one copies can be fed into the duplex tray under the combing wheel.

Paddles 18 and 19 are shown in their rest positio...