Device for detecting rotational speed of a tape reel

Details Device for detecting rotational speed of a tape reel Device for detecting rotational speed of a tape reel

1976-06-16

1978-04-25

Mautz, George F.

Signals and indicators

Alarms

Fluid flow

116 67A, 242 57, 242191, 340259, G08B 536, G01D 532, G11B 1518, B65H 2530

Patent

active

040856984

ABSTRACT:
A device for detecting rotational speed of a tape reel in a tape recording and/or reproducing apparatus by displacing a magnet from a first position where said magnet does not actuate a magnetically sensitive element to a second position where said magnet actuates the element when the rotational speed of a first rotating means adapted to rotate in synchronization with a supply reel exceeds the constant speed of a second rotating means driven by a tape moving means to rotate at a constant speed and coupled to said first rotating means and operating indicating means responsive to said element so as to inform an operator, for example, that only a little tape remains on the supply reel.

REFERENCES:
patent: 2514402 (1950-07-01), Lyon
patent: 3305185 (1967-02-01), Tegu
patent: 3480230 (1969-11-01), Hosono et al.
patent: 3759463 (1973-09-01), Yoshii
patent: 3913519 (1975-10-01), Sugano

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