Typewriting machines – Carriage or carriage-moving or movement-regulating mechanism – Carriage backspace mechanism
Patent
1983-11-09
1985-11-12
Wright, Jr., Ernest T.
Typewriting machines
Carriage or carriage-moving or movement-regulating mechanism
Carriage backspace mechanism
4003072, 400312, 400478, 400665, B41J 1962
Patent
active
045524742
ABSTRACT:
A backspace device in a typewriter comprising: an interposer operable by the operation of a key lever; a cycle bail operable by the interposer; a cycle clutch for intermittently transmitting a driving force from a driving source to a main shaft so that the main shaft can be rotated by a predetermined number of times in association with the cycle bail; an actuating bail for performing a cycle of a motion along a moving path of a predetermined mode by a full turn of the main shaft, while rendering to the interposer a motion in a direction of the interposer leaving the cycle bail during the motion; a backspace link for moving in association with the interposer during the leaving motion of the interposer; a backspace rack extending laterally of the typewriter, supported rotatably about an axis laterally disposed and turned to a working position by the backspace link; and a backspace pawl fastened onto a carriage so that it can be reciprocated a predetermined distance in the lateral direction by a cam rotatable integrally with the main shaft and having a toothed portion to be meshed with the backspace rack rotated to the working position; wherein the carriage is retracted by a predetermined value of pitch along the main shaft by a reaction force generated at a portion of the engagement of the backspace pawl with the backspace rack by a motion of the backspace pawl.
REFERENCES:
patent: 2879876 (1959-03-01), Palmer et al.
patent: 3366215 (1968-01-01), Hosey et al.
patent: 3618736 (1971-11-01), Abell, Jr. et al.
IBM Technical Disclosure Bulletin, "Self-Phasing Backspace Mechanism", Schaefer, vol. 12 No. 12, May 1970, p. 2192.
IBM Selectric Typewriter Service Manual, dated May, 1975, pp. 80, 101, 105, 113, 117.
Barozzi Gian P.
Horeschi Giancarlo
Tokyo Juki Industrial Co. Ltd.
Wright, Jr. Ernest T.
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