Torque-limiting carriage return knock-off mechanism

Details Torque-limiting carriage return knock-off mechanism Torque-limiting carriage return knock-off mechanism

1980-06-27

1983-05-17

Sewell, Paul T.

Typewriting machines

Carriage or carriage-moving or movement-regulating mechanism

Carriage-return mechanism

4003172, 4003173, B41J 1970

Patent

active

043837778

ABSTRACT:
A carriage return device utilizing a spring clutch and shock unloader spring is disclosed in conjunction with a cord tension sensing mechanism for detecting the cord tension increases when the paper carriage of a typewriter ceases to move and the carriage return drive mechanism continues to operate. It is desirable to disengage the drive mechanism at that point rather than to cause frictional wear or overloading of the motor pending a predetermined amount of driving time prior to disengagement. Upon the cord tension reaching a preset value, the clutch pawl will disengage the drive clutch and prevent further wear of the clutching arrangement. To prevent premature disengagement of the clutch, a shock unloading pretensioned spring is incorporated in the drive unit to absorb the initial shocks of clutch engagement and the forces experienced during acceleration of the paper carriage.

REFERENCES:
patent: 909539 (1909-01-01), Burlingame
patent: 1386387 (1921-08-01), Waldheim
patent: 2647609 (1953-08-01), Sagner
patent: 2700513 (1955-01-01), Miles
patent: 3263793 (1966-08-01), Brignole
patent: 3661338 (1972-05-01), Becking
IBM Customer Engineering Manual, 241-5159-2, 1965, pp. 57-58, 400-317.3.

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