Browse Prior Art Database

Simplified O Ring Document Transport

IP.com Disclosure Number: IPCOM000083317D
Original Publication Date: 1975-May-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

McDaniels, LM: AUTHOR

Abstract

Existing 0-ring document drives employ a number of methods of holding the document against the O-ring to provide driving force. Spring-loaded idler rollers or magnet-actuated rollers and pressure pads create little or no wear on the 0-ring, but they increase cost and often require readjustment. Fixed or spring-loaded pads are less expensive, but they can shorten life of the drive significantly because the 0-rings will not resist this type of wear.

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Simplified O Ring Document Transport

Existing 0-ring document drives employ a number of methods of holding the document against the O-ring to provide driving force. Spring-loaded idler rollers or magnet-actuated rollers and pressure pads create little or no wear on the 0- ring, but they increase cost and often require readjustment. Fixed or spring- loaded pads are less expensive, but they can shorten life of the drive significantly because the 0-rings will not resist this type of wear.

Shown are two inexpensive techniques which provide a reliable drive and greatly reduce 0-ring wear. In Fig. 1 is shown an 0-ring positioned between two ridges on a document path. As a document enters the transport area, it is forced to conform to the geometry of the path/O-ring arrangement. The stiffness of the document forces it to contact the 0-ring, thus creating a normal force of the document against the O-ring. This allows the 0-ring to drive the document. An alternative path design is a groove in the path, as shown in Fig. 2.

Advantages of this transport method are that there is no wear on the 0-ring when no document is being transported; fewer parts are required than existing transports; a wide range of document thicknesses can be transported with the same 0-ring to path geometry, and; no adjustments are needed after assembly.

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