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Guide Rim for Fingers on Print Wheel

IP.com Disclosure Number: IPCOM000083173D
Original Publication Date: 1975-Apr-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Meier, JH: AUTHOR

Abstract

High-speed motion pictures of a fingered print wheel show serious vibration of the fingers in the plane of the wheel, upon deceleration imposed by a motor. These vibrations if unchecked could seriously impair print quality at high-print rates.

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Guide Rim for Fingers on Print Wheel

High-speed motion pictures of a fingered print wheel show serious vibration of the fingers in the plane of the wheel, upon deceleration imposed by a motor. These vibrations if unchecked could seriously impair print quality at high-print rates.

To reduce such vibrations a light-weight rim 10 having guide protrusions 12 between the type fingers 14 is proposed, as shown in Figs. 1, 2 and 3. The protrusions 12 fit between the type fingers 14 just below the neck at the junction of the type.

Such an arrangement, (1) brings the type fingers 14 into the proper static position, even if the molding is not perfect, (2) it effectively reduces vibrations in the plane of the print wheel; the small clearance between the protrusions 12 and the fingers 14 allows the fingers to impact against the protrusions and permits impact damping, and (3) it permits preloading the fingers 14 so that they return and settle out better after impact, and are all in the same plane when not impacted. This feature aids in preventing catching of the ribbon by fingers 14 that are bent forward slightly because of shrinkage, etc. The hammer stroke can thus be kept at a minimum.

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