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Browse Prior Art Database

Softip for Intermittent Motion Imparting Device

IP.com Disclosure Number: IPCOM000086815D
Original Publication Date: 1976-Nov-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Johnson, OD: AUTHOR [+2]

Abstract

The intermittent-motion-imparting device (IMID) shown in Fig. 1, is a device which converts electrical power into elliptical motion at the contact point of an elastomer tip. Upon contact of the tip with a surface, forces will be transmitted along the directions shown. Large values of the impact force F(N) will produce an impact noise against a surface being driven. If this surface is a document, noise levels may exceed allowable noise standards.

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Softip for Intermittent Motion Imparting Device

The intermittent-motion-imparting device (IMID) shown in Fig. 1, is a device which converts electrical power into elliptical motion at the contact point of an elastomer tip. Upon contact of the tip with a surface, forces will be transmitted along the directions shown. Large values of the impact force F(N) will produce an impact noise against a surface being driven. If this surface is a document, noise levels may exceed allowable noise standards.

The value of the driving force F(T) necessary for moving the surface will vary with application. However, for the purpose of document transport, a driving force of 10-30 gf is adequate. Considering the high friction materials used at the contact point, an impact force of 50 gf is sufficient to provide document motion. In some IMID configurations, impact force may exceed 200 gf. This extra force is transmitted to the document and document support. Since the force is perpendicular to document motion, the excess force must be dissipated through noise, vibration and heat.

To reduce impact noise, a softer impact force is desired. This can be accomplished by the addition of a weak spring to the elastomer tip at the contact point to provide a "softip". Using this spring, the tip will transmit an impact force based on the spring rate of the softip and amplitude of the IMID. This allows the amount of impact force to be controlled by changing the spring rate of the softip.

The softip...