Browse Prior Art Database

Paper Feed System

IP.com Disclosure Number: IPCOM000048729D
Original Publication Date: 1982-Mar-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Adams, L: AUTHOR

Abstract

Improved sheet feeding from a cassette is obtained by an arrangement of corner bucklers with enlarged radiuses, D-shaped paper picker rollers and an array of picker rollers interleaved with an upper cover plate.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 2

Paper Feed System

Improved sheet feeding from a cassette is obtained by an arrangement of corner bucklers with enlarged radiuses, D-shaped paper picker rollers and an array of picker rollers interleaved with an upper cover plate.

Supply cassette 10 is shown in broken side view in Fig. 1 and top view in Fig.
2. Cassette 10 retains a stack of sheets 12 on floor plate 15 which is upwardly biased by means not shown towards the underside of corner bucklers 16 and 17. Side walls 20 and 21 are upwardly extended and include inwardly projecting walls 22 and 23 to act as sheet retainers so that the upper surface of cassette 10 can retain sheets as for exit tray purposes, storage or the like. Upper wall 25 has extending portions 26 and 27 which further have downward projecting ridges 28 and 29 to prevent sheets from sliding over corner bucklers 16 and 17 in an unintended manner.

Typical contemporary corner bucklers have relatively sharp bends so that, as paper is depressed to the corner bucklers, a curled sheet is driven into the sharp corner of the buckler. The picker rollers upon initiating buckling of the top sheet cause an unintended downward buckle into the cassette, which buckle has to roll and reverse direction before the sheet can be properly ejected. Corner bucklers 16 and 17 have enlarged bend radiuses, such as at 18 for 17 (3 mm radius, for instance), to impart direction to the sheet as the picker rollers start the buckling operation. The radius tends to feather the paper stack so that the top sheet is driven around the radius as it buckles, tending to aid the buckle in the proper direction.

Stationary picker rollers 30, 31 and 32 of a D-shaped cross-section are attached to shaft 33 which is selectively rotated by means not shown....