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Browse Prior Art Database

Automatic Document Feeder

IP.com Disclosure Number: IPCOM000039791D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 5 page(s) / 55K

Publishing Venue

IBM

Related People

Alimpich, C: AUTHOR [+4]

Abstract

This automatic document feeder accepts a stack of original documents and operates to feed the document sheets, one at a time, to a copier's glass platen for copying. The feeder provides automatic document feeding with or without recirculation. The feeder also provides semiautomatic document feeding (SADF) with manual insertion of individual sheets to be copied. The following modes of operation are provided: (1) recirculation with simplex-to-simplex copying, (2) recirculation with simplex-to- duplex copying, (3) recirculation with either duplex-to-duplex or duplex-to-simplex copying, (4) non-recirculation with either simplex-to- simplex or simplex-to-duplex copying, and (5) manual feed of one sheet at a time with either simplex-to-simplex copying or simplex-to-duplex copying.

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Automatic Document Feeder

This automatic document feeder accepts a stack of original documents and operates to feed the document sheets, one at a time, to a copier's glass platen for copying. The feeder provides automatic document feeding with or without recirculation. The feeder also provides semiautomatic document feeding (SADF) with manual insertion of individual sheets to be copied. The following modes of operation are provided: (1) recirculation with simplex-to-simplex copying, (2) recirculation with simplex-to- duplex copying, (3) recirculation with either duplex- to-duplex or duplex-to-simplex copying, (4) non-recirculation with either simplex- to- simplex or simplex-to-duplex copying, and (5) manual feed of one sheet at a time with either simplex-to-simplex copying or simplex-to-duplex copying. In the recirculation mode of operation, the feeder operates to feed sheets from the top of the stack and restacks the sheets to the bottom of the stack. Fig. 1 is a front schematic view of the document feeder. Document sheets are fed, from right to left, to the top of glass platen 10 until the sheet's leading edge is positioned at copying registration position 11. Here, the document stops, and is thereafter illuminated for copying. This manner of sheet feeding is accomplished by the bottom horizontal run of belt 12. Belt 12 is driven by roller 13, usually in a clockwise direction, although reverse belt movement is provided in order to flip a duplex original document sheet, as will be described. In the automatic document feeding modes of operation (i.e., either the recirculating or the non-recirculating mode), a stack 14 of original document sheets is manually placed on table 15, between wall 16 and housing 17. The short dimension of stack 14 extends between members 16 and 17. The document resides on table 15 with its page one facing up. If the document is a duplex document, all odd-numbered pages face up, and all even-numbered pages face down. Housing 17 includes a cycling stack lifter mechanism (not shown). This mechanism operates to periodically lift and then lower the stack's left edge, so that recirculated sheets can rejoin the bottom of the stack, one at a time. A jogging mechanism 18 operates to impact the side of the stack, to thereby ensure even stacking of the document sheets. Recirculated document sheets follow exit path 19 as they rejoin the stack. In the non-recirculating mode, sheets follow exit path 20, and are stacked in an exit tray (not shown). A sheet deflector (not shown) directs the exiting sheet to the proper one of paths 19 and 20. In the semiautomatic mode of operation, sheets are fed one at a time to platen 10 by way of manual insertion into path 21. After copying, these sheets also exit the platen by way of path 20. Picking the top sheet from stack 14 is accomplished by vacuum pickers 22. These pickers move vertically down onto the top sheet of the stack, and then move up to deliver the top sheet to the bott...