192 clutches and power-stop control – Stop mechanism – Limit stop
Patent
1980-02-25
1982-01-12
Staab, Lawrence J.
192 clutches and power-stop control
Stop mechanism
Limit stop
74425, 74435, 74439, 192 33R, F16D 4326, F16D 7100
Patent
active
043100872
ABSTRACT:
A single revolution clutch in a reduction gear in a franking machine is designed to avoid fraudulent operation and double cycling and for economical production by arranging a worm to drive a split worm wheel having a gap in each arcuate row of teeth respectively on the first and second worm wheel parts. Before operation, the worm rotates in the gaps. On release by a detent of a shoulder a spring brings a tooth into mesh with the worm which rotates the first worm wheel part until a lost-motion connection is engaged bringing the second worm wheel part into mesh with the worm to drive an output shaft. The detent is released by an electrical pulse then guided by a cam track to engage the shoulder arresting the first worm wheel part while the second part continues so as to stress the spring and return to the initial position with respect to the first part.
REFERENCES:
patent: 3067627 (1962-12-01), Pickles
patent: 3661339 (1972-05-01), Shimizu
patent: 4003267 (1977-01-01), Busch
Staab Lawrence J.
Vickers Limited
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