Variable step size impulse drive

Details Variable step size impulse drive Variable step size impulse drive

1978-09-05

1979-12-25

Mackev, Robert

Machine element or mechanism

Mechanical movements

Rotary to intermittent unidirectional motion

F16H 2900

Patent

active

041799453

ABSTRACT:
The impulse drive mechanism has a drive pawl which is periodically retracted sufficiently to engage a tooth at maximum tooth spacing to advance the sequence control cam a maximum step. If a lesser step is desired (can be used) the ratchet tooth spacing is decreased and the masking device which incorporates a follower engaging the cam on the inside of the ratchet is moved into position to prevent engagement of the pawl with a tooth at greater spacing. The cam drum can be advanced in small angular increments when only tolling time and the angular increment can be increased to accomodate sequential switching during the advance step if required.

REFERENCES:
patent: 3354733 (1967-11-01), Cartier
patent: 3395585 (1968-08-01), Obermann
patent: 3724248 (1973-04-01), Obermann

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