Electricity: motive power systems – Automatic and/or with time-delay means – Speed or rate-of-movement
Patent
1976-02-19
1978-02-28
Schaefer, Robert K.
Electricity: motive power systems
Automatic and/or with time-delay means
Speed or rate-of-movement
318449, 318461, 318565, 361242, H02H 500
Patent
active
040769992
ABSTRACT:
An apparatus for insuring that the rotational speed of a spindle on a machine is prevented from exceeding a selected programmed speed. The apparatus is comprised of means for continuously receiving pulsed signals indicative of the instantaneous rotational speed of the spindle over a timed cycle, wherein the cumulative signal within the receiving means at the end of each timed cycle is representative of the actual rotational speed of the spindle. The apparatus is further comprised of a first register for receiving a first signal representative of a selected desirable rotational speed of the spindle, a second register for receiving from the receiving means a second signal representative of a percentage of the actual rotational speed of the spindle after a lapse of the same percentage of the timed cycle, means for comparing the first signal with the second signal at the end of each timed cycle, and for generating a third signal each time the second signal is greater than the first signal, and means for generating a fourth signal after receiving a predetermined number of the third signals to disable the motor which drives the spindle.
REFERENCES:
patent: 3564368 (1971-02-01), Kelling
patent: 3794972 (1974-02-01), Van Ostrom
patent: 3891046 (1972-02-01), Oicles
patent: 3941202 (1976-03-01), Sorkin
Edwards Clarence Roy
Fickes Ellwood Donald
Bernkopf Walter C.
Cahill Robert A.
General Electric Company
Mutter Michael K.
Schaefer Robert K.
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