Browse Prior Art Database

End-Of-Stack Mechanism

IP.com Disclosure Number: IPCOM000039975D
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Cochran, JL: AUTHOR

Abstract

In a bottom stacking document feeder which uses an interposer to mark the end of an original document stack, the interposer must not falsely trigger when reading the presence of a single sheet of 16-pound paper. In addition, during various job recovery modes it must be possible to retract the interposer from a mid-document stack and also to keep the interposer for extended periods of time in fully extended or fully retracted positions without power. A mechanism to accomplish the above is described. (Image Omitted) Mechanism 10 consists of permanent magnet armature 11 which rotates on pivot 12. Armature 11 is mechanically connected to link 13 through post 14, allowing rotational movement to the link. Link 13 in turn is connected to interposer (tab) 15 which is free to rotate at point 21.

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End-Of-Stack Mechanism

In a bottom stacking document feeder which uses an interposer to mark the end of an original document stack, the interposer must not falsely trigger when reading the presence of a single sheet of 16-pound paper. In addition, during various job recovery modes it must be possible to retract the interposer from a mid-document stack and also to keep the interposer for extended periods of time in fully extended or fully retracted positions without power. A mechanism to accomplish the above is described.

(Image Omitted)

Mechanism 10 consists of permanent magnet armature 11 which rotates on pivot 12. Armature 11 is mechanically connected to link 13 through post 14, allowing rotational movement to the link. Link 13 in turn is connected to interposer (tab) 15 which is free to rotate at point 21. In operation, mechanism 10 is driven by a force applied to armature 11 through electromagnet 16 (Fig. 2). The direction of travel of the mechanism which determines the insert or retract position is controlled by the appropriate current polarity applied to the electromagnetic coil. Armature 11 is so designed that the natural magnetic force between the poles of armature 11 and the poles of the electromagnet 16 will keep mechanism 10 in either insert or retract position, as desired, in the absence of electric power. As documents are placed in the copier/printer, interposer 15 is depressed into a horizontal position against the action of spring 17 attached to in...