Browse Prior Art Database

Paper Feed Roller

IP.com Disclosure Number: IPCOM000051316D
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Bement, RA: AUTHOR

Abstract

This molded paper feed roller allows a molding material to be selected for its friction properties, while the roller's specific spoke construction is selected in accordance with a desired force to be applied normal to the paper being fed.

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Paper Feed Roller

This molded paper feed roller allows a molding material to be selected for its friction properties, while the roller's specific spoke construction is selected in accordance with a desired force to be applied normal to the paper being fed.

Fig. 1 is a perspective view of the roller, whereas Fig. 2 is a cross-sectional view.

The roller is molded to a metal hub 10. This hub is then mechanically secured to shaft 11 which is driven to rotate on a fixed position axis. A stack of paper (not shown) is situated such that the bottom tangential portion of the wheel's surface 12 friction-feeds the top sheet of the stack, one sheet at a time. An exemplary wheel is 1 1/2 inches in diameter and 3/8 inch wide, measured in the direction of shaft 11.

The roller is injection molded from a material whose coefficient of friction to paper is selected to produce reliable feeding. The roller's annular surface 12 is quite thin, measured in the roller's radial direction. Surface 12 is connected to hub 10 by a number of integrally-molded spokes 13. The shape and thickness of these spokes determine the roller's rigidity at the area of contact to the paper, and thus the roller's normal force to the paper. This force remains substantially unchanged with deflection of roller surface 12, so long as the surface does not collapse all the way to hub 10.

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