Browse Prior Art Database

Follower Finger

IP.com Disclosure Number: IPCOM000062633D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 3 page(s) / 41K

Publishing Venue

IBM

Related People

Davis, DM: AUTHOR [+2]

Abstract

A recirculating automatic document feeder includes a follower finger which follows the separation between document sheets awaiting copying and document sheets already copied and returned to the document feeder stack. Fig. 1 shows a copier having a recirculating automatic document feeder 10. This feeder contains a duplex original document stack 11 which comprises N different images carried by N/2 sheets. The document feeder operates to feed sheets from the top of stack 11, one at a time, through path A, to platen 12 for copying. The document is then inverted, by way of path C, the other side is copied, the document is again inverted, and the document is restacked on the bottom of stack 11 by way of path B. (Image Omitted) Figs.

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Follower Finger

A recirculating automatic document feeder includes a follower finger which follows the separation between document sheets awaiting copying and document sheets already copied and returned to the document feeder stack. Fig. 1 shows a copier having a recirculating automatic document feeder 10. This feeder contains a duplex original document stack 11 which comprises N different images carried by N/2 sheets. The document feeder operates to feed sheets from the top of stack 11, one at a time, through path A, to platen 12 for copying. The document is then inverted, by way of path C, the other side is copied, the document is again inverted, and the document is restacked on the bottom of stack 11 by way of path B.

(Image Omitted)

Figs. 2-6 show a follower finger sensor which moves upward as it follows the interface between the last sheet of the original document stack and the first sheet of the stack, as stack 11 is circulated to platen 12 for copying. This interface comprises the first sheet of the stack immediately under the finger and the last sheet of the stack immediately above the finger. The follower finger, which moves upward through stack 11 as sheets are fed for copying, comprises a small, light-weight coil spring 50 which terminates in a plastic plug 51. Spring 50 is mounted to a plastic member 52 which freely pivots on shaft 53. A second coil spring 54 also mounts on member 52, and this spring terminates in a metal weight 55. Springs 50 and 54 are mounted to form an angle greater than a right angle. So long as at least one sheet of paper exists above spring 50, the follower finger remains in the position shown in Fig. 4, with spring 50 extending in a generally horizontal direction, under the sheet. However, when the last sheet is removed (Fig. 5), weight 55 operates to cause member 52, and springs 50 and 54, to pivot about shaft 53, due to the influence of gravity on wei...