Justifying text writing composing machine

Details Justifying text writing composing machine Justifying text writing composing machine

1978-09-25

1981-06-16

Wright, Jr., Ernest T.

Typewriting machines

Carriage or carriage-moving or movement-regulating mechanism

Carriage backspace mechanism

400260, 4003062, 400310, 400311, B41J 1962

Patent

active

042734550

ABSTRACT:
A mechanism which provides bi-directional movement of the carrier of an electric typewriter incorporating proportional spacing. A ratchet arrangement is operable in both directions to provide the desired proportional spacing increments, with rotation of a ratchet wheel in the clockwise direction being controlled by engagement of an associated pawl with one of a plurality of stop engaging surfaces of a control member which sets the number of proportional spacing increments desired. For rotation of the ratchet wheel in the counterclockwise direction, a solenoid is coupled to the control member to momentarily rotate it clockwise until a stop engaging surface thereof abuts a selected stop surface corresponding to the number of proportional spacing increments desired, and causing the pawl associated with the ratchet wheel to move clockwise by a corresponding number of ratchet teeth--after which the solenoid is released, permitting a cocked spring to return the control member to its initial position and cause the pawl to rotate the ratchet wheel counterclockwise by a corresponding number of proportional spacing increments.

REFERENCES:
patent: 416743 (1889-12-01), Redfield
patent: 448587 (1891-03-01), Redfield
patent: 2700447 (1955-01-01), Blodgett
patent: 2848091 (1958-08-01), Smathers
patent: 2904159 (1959-09-01), Smathers
patent: 2946421 (1960-07-01), Intagliata et al.
patent: 2965212 (1960-12-01), Toggenburger
patent: 3096865 (1963-07-01), Smathers
IBM Technical Disclosure Bulletin, "Integrated Forward and Backspace Mechanism," Miles et al., vol. 12, No. 12, May 1970, pp. 2189-2191.

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