Browse Prior Art Database

Document Feed Device With a Removable Snap On Cap

IP.com Disclosure Number: IPCOM000087455D
Original Publication Date: 1977-Feb-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Johnson, OD: AUTHOR

Abstract

As described in U.S. Patent 3,747,921, the document feed device is a device that first converts electrical power into a sinusoidal driving motion. This sinusoidal driving motion in turn is converted by an elastomer tip assembly into an elliptical motion at the tip's free end. Upon contact with a document, this elastomer tip will produce intermittent forces suitable for feeding a document.

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Document Feed Device With a Removable Snap On Cap

As described in U.S. Patent 3,747,921, the document feed device is a device that first converts electrical power into a sinusoidal driving motion. This sinusoidal driving motion in turn is converted by an elastomer tip assembly into an elliptical motion at the tip's free end. Upon contact with a document, this elastomer tip will produce intermittent forces suitable for feeding a document.

The construction of the tip assembly is a critical balance of many parameters. The elastomer must have dynamic viscoelastic properties capable of producing and maintaining a predetermined phase shift of the linear and rotational motions given the tip base. The accumulative phase shift and the tip geometry determine the size and orientation of the ellipse formed.

As shown in Fig. 1, the tip assembly has a cylindrically-shaped silicone rubber base with a hemispherically-shaped removable polyurethane rubber cap. The base of this assembly is comprised of a shaft and leaf spring joined together and partially encapsulated by the silicone rubber.

Silicone rubber is used for the elastomer tip since its dynamic modulus and damping level are less affected by temperature changes. However, when the entire tip was made of silicone rubber, it showed little resistance to abrasion and surface wear.

Fig. 2 shows a section of the tip assembly with the cap removed. The cap has a widened "0" ring, dimension x around the cap's bottom edge that stretc...