Apparatus for controlling window blinds and awnings

Details Apparatus for controlling window blinds and awnings Apparatus for controlling window blinds and awnings

1990-01-17

1991-08-06

Ro, Bentsu

Electricity: motive power systems

Automatic and/or with time-delay means

Movement, position, or limit-of-travel

318266, 318466, H02P 122

Patent

active

050380877

ABSTRACT:
In an apparatus for controlling a D.C. motor used in the lifting and lowering operation of a window blind or an awning, pulses induced as a result of rotation of the motor rotor are used for delivering signals to a signal receiving means. The signal receiving means includes a counter for counting the induced pulses, a memory that stores the number of pulses required for the blind or awning to move between its end positions, and a comparator circuit for generating a control signal when the operating current to the motor exceeds a predetermined value, and delivers signals to stop the motor at the end positions of the blind or awning.

REFERENCES:
patent: 4443745 (1984-04-01), Seino et al.
patent: 4514670 (1985-04-01), Fassel et al.
patent: 4746845 (1988-05-01), Mizuta et al.
patent: 4870333 (1989-09-01), Itoh et al.
patent: 4871954 (1989-10-01), Rathgeber
patent: 4902953 (1990-02-01), Kraft et al.

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