Browse Prior Art Database

Automatic Document Feeder Prefeed

IP.com Disclosure Number: IPCOM000049530D
Original Publication Date: 1982-Jun-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Conly, DJ: AUTHOR

Abstract

In a document copying machine where a document is held in a stationary manner while being processed, high throughput can be obtained through the use of an automatic document feed device. However, in order to keep document velocity at a reasonable level when moving the processing station, movement of a second original from a staging location is begun prior to exit of the first original from the processing station.

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Automatic Document Feeder Prefeed

In a document copying machine where a document is held in a stationary manner while being processed, high throughput can be obtained through the use of an automatic document feed device. However, in order to keep document velocity at a reasonable level when moving the processing station, movement of a second original from a staging location is begun prior to exit of the first original from the processing station.

The figure shows a tray 10 upon which a stack of original documents may be placed against gate 15 under a feed wheel 13. Documents are moved in serial fashion by wheel 13 into the nip of rollers 19 and 20, around guides 25 and 26, through rollers 27 and 28, 29 and 30 to document glass 31, and across glass 31 by rollers 40, 41 and 42 to a registration gate 32 where document movement is halted and a copying process begun. After completion of the process, the gate 32 is dropped and rollers 40, 41, 42 and 43 move the document to an exit tray
33.

While a first document is being copied, the next document is fed by wheel 13 through rollers 19 and 20 until the leading edge of the document is sensed by sensor device 36. The next document is then held at that position until the copying process of the first document is finished, exit gate 32 has been retracted, and rollers 40, 41, and 42 begin to exit the document. At that time, rollers 19 and 20 are activated to feed the next document toward document glass 31.

Should the leading e...