Patent
Electrically operated rotational actuator with failsafe disengagement
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TLDR
In this article, a rotational actuator including an electric motor and gear reduction means is provided by a planetary arrangement which transmits the rotational motion or permits its output shaft to "free-wheel" as a function of engagement or disengagement of a solenoid operated device for restraining the rotation of the ring gear of a planetary subassembly or permitting its free rotation.Abstract:
A rotational actuator including an electric motor and gear reduction means. The gear reduction is at least partly provided by a planetary arrangement which transmits the rotational motion or permits its output shaft to "free-wheel" as a function of engagement or disengagement of a solenoid operated device for restraining the rotation of the ring gear of a planetary subassembly or permitting its free rotation, respectively. The output shaft is thus readily manually overridden when the solenoid is not energized. An optional overcenter resilient means (compression spring) provides for return of the output shaft to a first or second extreme position when the solenoid is deenergized.read more
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Fast forward tape advance
TL;DR: In this paper, a magnetic tape recorder with a planetary gearing mechanism for increasing the speed of rotation of the capstan shaft has been described to increase the transport speed of the tape within a cartridge without increasing the speeds of the associated drive motor.