Escapement mechanism and backspace mechanism for a moving paper

Details Escapement mechanism and backspace mechanism for a moving paper Escapement mechanism and backspace mechanism for a moving paper

1979-07-02

1981-08-25

Wright, Jr., Ernest T.

Typewriting machines

Carriage or carriage-moving or movement-regulating mechanism

Carriage backspace mechanism

4003072, 400311, 400320, 400331, B41J 1962

Patent

active

042856051

ABSTRACT:
A mechanism which will function to allow the escapement of the carriage of a typewriter in one of two predetermined escapement pitches and be capable of backspace operation from a single backspace input for both pitches regardless of which escapement pitch is selected. Escapement ratchets for the two selected pitches are combined, together with a backspace ratchet. Each of the escapement ratchets are engageable by an escapement pawl and the engagement of a pawl with a particular ratchet will determine the pitch within which the escapement system will function. A backspace ratchet is combined with the escapement ratchets and fixedly attached thereto to provide the backspace drive. The backspace ratchet is selectably engageable by the backspace pawl for causing rotation in the opposite direction of that normally utilized for escapement. All motion of the escapement ratchets or backspace ratchet is transmitted through a pinion mounted to the ratchet assembly and, in turn, is transmitted to the paper carriage rack.

REFERENCES:
patent: 844289 (1907-02-01), Schuler
patent: 2268867 (1942-01-01), Gabrielson et al.
patent: 3346086 (1967-10-01), Cralle et al.
patent: 3482671 (1969-12-01), Shattuck
patent: 3985220 (1976-10-01), Rix et al.
IBM Technical Disclosure Bulletin, "Integrated Forward and Backspace Mechanism," Miles et al., vol. 12, No. 12, May 1970, pp. 2189-2191.
IBM Technical Disclosure Bulletin, "Backspace for Dual-Pitch Escapement," Lloyd, vol. 22, No. 10, Mar. 1980, pp. 4774-4775.

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