Escapement mechanism for typewriters

Details Escapement mechanism for typewriters Escapement mechanism for typewriters

1977-02-18

1978-07-18

Wright, Jr., Ernest T.

Typewriting machines

Carriage or carriage-moving or movement-regulating mechanism

Carriage-feed mechanism

400320, 400300, B41J 1920

Patent

active

041012240

ABSTRACT:
Disclosed is a mechanism for replacing the non-escapement magnet normally utilized to inhibit escapement during certain machine functions on a typewriter. A detent arm is connected to the normal pawl knock-off arm so that upon the print shaft rotating and effecting, by a cam thereon, movement of associated linkage and motion of the knock-off arm to disengage the pawl from the ratchet wheel, the detent arm associated with the knock-off arm detents the ratchet wheel and inhibits escapement thereof until the linkage and knock-off arm returns to its normal position by rotation of the print shaft. Thus, if the escapement magnet coil is not energized, the pawl associated with the magnet will return to its normal position and the ratchet wheel will, because of the detent of the member associated with the knock-off arm, be inhibited from motion.

REFERENCES:
patent: 3630336 (1971-12-01), Johnson et al.
patent: 3750797 (1973-08-01), Hunt et al.
patent: 3779359 (1973-12-01), Morrison et al.
IBM Technical Disclosure Bulletin, "Printer with High--Speed Space Control," Tanner, vol. 12, No. 12, May 1970, pp. 2260-2261.
IBM Technical Disclosure Bulletin, "Electromechanical Left-Hand Final Stop," Baker et al., vol. 18, No. 7, Dec. 1975, pp. 2218-2219.

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