Spring wrap clutch with brake

Details Spring wrap clutch with brake Spring wrap clutch with brake

1974-07-24

1976-10-12

Wyche, Benjamin W.

192 clutches and power-stop control

Clutch and brake

192 26, 192 33C, 188 827, F16D 6706, F16D 1102

Patent

active

039852121

ABSTRACT:
A clutch assembly which provides selective output drive especially adapted for use in incrementally driving a platen and tape reader mechanism for use in printers. An output gear is freewheelingly mounted upon the clutch assembly driven shaft and is mechanically linked to a free wheeling cam through a helical spring wound tightly about the driven shaft. The free wheeling cam is provided with at least one notch for selective engagement by a pivotally mounted solenoid actuated latch. When the latch is disengaged from the free wheeling cam, the spring is rotated by the driven shaft and imparts its rotation to both the output gear and the cam. Upon actuation of the solenoid, the latch member engages the free wheeling cam member to restrain it from rotation, causing the helical spring to unwrap itself (i.e., loosen) about the shaft and stop the output gear from rotating. The spring, however, attempts to rotate the output gear in the reverse direction, which action is prevented by backstop engaging a shoulder in the cam surface provided in the output gear. The clutch assembly is characterized by its simplicity of design and ease of manufacture and assembly.

REFERENCES:
patent: 2475432 (1949-07-01), Marihart
patent: 2885042 (1959-05-01), Frechette
patent: 3021512 (1962-02-01), Welsh et al.
patent: 3104745 (1963-09-01), Wipke
patent: 3277986 (1966-10-01), Beare
patent: 3376963 (1968-04-01), Schaefer
patent: 3602348 (1971-08-01), Mohr

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