Browse Prior Art Database

Type Selection Mechanism

IP.com Disclosure Number: IPCOM000079400D
Original Publication Date: 1973-Jun-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Gaston, CA: AUTHOR

Abstract

Described is a typewriter ball positioning mechanism for electric typewriters, which is driven from a single shaft rotating at constant speed. It can achieve any of eleven temporary static positions by proper phasing of the two fixed-format mechanical inputs.

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Type Selection Mechanism

Described is a typewriter ball positioning mechanism for electric typewriters, which is driven from a single shaft rotating at constant speed. It can achieve any of eleven temporary static positions by proper phasing of the two fixed-format mechanical inputs.

Referring to Fig. 1, properly phased activation of both the clockwise and counterclockwise single-turn mechanisms will cause rotation of the type ball to the desired position. While movement begins just the first single-turn mechanism is operating. Pausing of the type ball in the desired position occurs while both mechanisms are operating, and then returning of the ball to its original position takes place after the first mechanism has stopped, but the second is still operating.

Referring to the time diagram of Fig. 2, the proper delay between activation of the first and second single-turn mechanisms (for example, between times 1 and 2, 5 and 6, or 9 and 10) will determine the amount of ball rotation at the pause. It may also be desirable to place a detent type mechanism on the output of the differential, to assure that it pauses precisely at one of the eleven desired positions.

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