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Browse Prior Art Database

Spring Bias Selection Mechanism Using Barrel Selector Cam

IP.com Disclosure Number: IPCOM000088670D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Huber, DL: AUTHOR [+2]

Abstract

The concept of accomplishing tilt and rotate selection of a typehead using barrel cams which drive the selection mechanism is illustrated in U. S. Patent 3,892,304. In this patent, the tilt and rotate mechanisms are essentially free floating, multidegree of freedom type systems. The clearances required to allow the typehead to move for detenting due to inherent position error are distributed throughout the mechanical system. As a result in some cases, the detent requires the movement of the downstream masses of parts, such as the lower ball socket and shaft 10, pinion 12, rack 14 and barrel cam 16 in the rotate system and the tilt ring 18, the tilt link 20, tilt bell crank 22 and tilt barrel cam 24 in the tilt system.

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Spring Bias Selection Mechanism Using Barrel Selector Cam

The concept of accomplishing tilt and rotate selection of a typehead using barrel cams which drive the selection mechanism is illustrated in U. S. Patent 3,892,304. In this patent, the tilt and rotate mechanisms are essentially free floating, multidegree of freedom type systems. The clearances required to allow the typehead to move for detenting due to inherent position error are distributed throughout the mechanical system. As a result in some cases, the detent requires the movement of the downstream masses of parts, such as the lower ball socket and shaft 10, pinion 12, rack 14 and barrel cam 16 in the rotate system and the tilt ring 18, the tilt link 20, tilt bell crank 22 and tilt barrel cam 24 in the tilt system. This requires varying amounts of work from the detent mechanism and could produce marginal, nonrepetitive detent to print timing.

This condition may be corrected by the addition of a bias spring in the system, such as the bias spring 8 and bias spring 26 in the rotate and tilt systems illustrated. Both springs function to take up the clearances between parts, thereby providing a more predictable dynamic response. To compensate for the clearances being removed from the chain of parts clearance is introduced in a controlled manner at connection 28 in the tilt mechanism and in the upper and lower ball socket by use of the dog-bone connector 6, thereby allowing the detenting mechanism to move eff...