Electronically controlled swell shutter operator for pipe organs

Details Electronically controlled swell shutter operator for pipe organs Electronically controlled swell shutter operator for pipe organs

1980-09-23

1982-11-30

Truhe, J. V.

Music

Instruments

Wind

84DIG19, G10B 316

Patent

active

043610692

ABSTRACT:
An electronically controlled swell shutter operator for pipe organs includes an electric motor driving a speed reducer whose output is connected to move the shutters of a pipe organ swell chamber, in order to control the volume of sound heard by the listeners. A swell pedal controlled by the organ player operates a first potentiometer and establishes a first voltage of a given polarity, the magnitude of which represents the exact position that the shutters should be in. The output of the speed reducer operates a second potentiometer which establishes a second voltage of a polarity opposite to that of the swell pedal potentiometer, the magnitude of this second voltage being dependent on the position of the swell shutters. A system of integrated circuit comparators compares the above-mentioned first and second voltages to produce an error signal. A logic system responds to the comparison result to cause the shutters to move in a desired direction and at a suitable speed to reduce the error and to achieve a balance, whereby the swell shutters assume a position corresponding to the position of the swell pedal. Dynamic braking and a system of automatically adjustable dead bands prevents overshoot and hunting.

REFERENCES:
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patent: 2005643 (1935-06-01), Willis et al.
patent: 2072844 (1937-03-01), Austin
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patent: 3495145 (1970-02-01), Sordello et al.
patent: 3513247 (1970-05-01), Anderson et al.
patent: 3701833 (1972-10-01), Bosche, Jr.
patent: 3736486 (1973-05-01), Gould et al.
patent: 3749997 (1973-07-01), Cohen et al.
patent: 3995208 (1976-11-01), Parr
patent: 4216422 (1980-08-01), Divjak et al.

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