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Self Lifting Spring Platen and Forms Feed Assembly

IP.com Disclosure Number: IPCOM000051633D
Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Schall, TE: AUTHOR

Abstract

The figure illustrates an end cross-sectional view of the mechanism comprising a platen and some friction feed wheels for the insertion of a document into an area to be printed by a printing head 1. Drive roller 2 can frictionally engage a document (not shown) between its surface and the surface of the pressure roller 3 to draw a document in along the forms-feeding path 4 indicated so as to position an area of a document adjacent to the tip of the printing head 5 and the surface of a platen 6.

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Self Lifting Spring Platen and Forms Feed Assembly

The figure illustrates an end cross-sectional view of the mechanism comprising a platen and some friction feed wheels for the insertion of a document into an area to be printed by a printing head 1. Drive roller 2 can frictionally engage a document (not shown) between its surface and the surface of the pressure roller 3 to draw a document in along the forms-feeding path 4 indicated so as to position an area of a document adjacent to the tip of the printing head 5 and the surface of a platen 6.

Eccentric cam 7, mounted on rotating shaft 8, is used to bear against the cam follower 9 and raise the pressure roller 3 which is spring-loaded by the cantilever spring 10 to create contact between rollers 2 and 3 when the surface of cam 7 is not in contact with follower 9. When the cam 7 raises follower 9 in the course of its rotation, as shown by the arrow, the pressure rollers 2 and 3 will be separated for easier insertion of a document along path 4.

At the same time, it will be necessary to raise the flat platen 6. To accomplish this, platen 6 is made of a self-biased spring steel member 11 rigidly affixed to frame member 12. When cam 7 is not in contact with follower 9, it is in contact with the back side of platen 6, forcing it downward into the position for proper engagement with the document and to provide a backup surface for the print head tip 5 to effect printing. When cam 7 raises follower 9 and separates its fr...