Communications: electrical – Selective – Interrogation response
Patent
1979-10-30
1982-03-30
Swann, III, Glen R.
Communications: electrical
Selective
Interrogation response
187 39, 324166, 318327, 340670, B66B 300, G08B 2100
Patent
active
043227120
ABSTRACT:
An apparatus for detecting and controlling an elevator speed which includes a rotary disc rotated by a motor which moves an elevator cage and including a pulse generator which produces a pulse signal proportional to an elevator speed in cooperation with the rotary disc. The pulse signal is differentiated by a differentiation circuit and the output signal of the differentiation circuit is rectified by a full-wave rectifying circuit with the output signal of the rectifying circuit supplied to a monostable multivibrator. The output signal of the multivibrator is smoothed by a smoothing circuit which thereby produces an analog speed control signal. The multivibrator includes a zener diode operating to decrease the voltage level of the smoothing circuit output should the power source voltage drift. The rotary disc has projecting portions and apertures between the projecting portions all of which are of the same shape and width. The pulse generator detects a ray of light or magnetic flux passing through the apertures in the rotary disc generating the pulse signal during the rotation of the rotary disc.
REFERENCES:
patent: 3222550 (1965-12-01), Willard et al.
patent: 3706035 (1972-12-01), Hoehn
patent: 3898611 (1975-08-01), Mandel
patent: 4008424 (1977-02-01), Bompani
Mitsubishi Denki & Kabushiki Kaisha
Swann III Glen R.
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