초록 ▼

This invention relates to a circuit arrangement and the associated mechanism for slaving the angles of rotation of the slats of a plurality of centrally controlled sun or window blinds. The driving motor of each blind is provided with current via a corresponding operational amplifier and related cir

This invention relates to a circuit arrangement and the associated mechanism for slaving the angles of rotation of the slats of a plurality of centrally controlled sun or window blinds. The driving motor of each blind is provided with current via a corresponding operational amplifier and related circuit. The motor operates the slats to achieve balance between an input control voltage and a voltage depending on the angular position of the slats. An automatic version in which the control voltage is generated by a photoelectric sensor and several circuit variations are shown.

대표청구항 ▼

In a follow-up system for positioning the louvers of a venetian blind or the like, said system comprising: positive, negative, zero and nominal input leads; variable means for producing an input voltage on said nominal input lead to control the position of the louvers; first and second differential

In a follow-up system for positioning the louvers of a venetian blind or the like, said system comprising: positive, negative, zero and nominal input leads; variable means for producing an input voltage on said nominal input lead to control the position of the louvers; first and second differential amplifiers each having a plus input, a minus input, and an output; first and second resistors connected from said nominal input lead to the minus inputs of said first and second amplifiers, respectively; a third resistor connected from the minus input of said first amplifier to said positive input lead; a fourth resistor connected from the minus input of said second amplifier to said negative input lead; first and second transistors; said first transistor having an emitter connected to said negative input lead; said first and second transistors each having a base and a collector; said second transistor having an emitter connected to said positive input lead; a collector connected to that of said first transistor; said transistors being of opposite conductivity types; a fifth resistor connected from said first amplifier output to said first transistor base; a sixth resistor connected from said second amplifier output to said second transistor base; a seventh resistor connected from said first transistor base to said negative input lead; an eighth resistor connected from said second transistor base to said positive input lead; a motor having a drive shaft to tilt the louvers; said motor being connected from said transistor collectors to said zero input lead; and feedback means connected between said positive and negative input leads; said feedback means including a potentiometer having a winding and a wiper movable in contact with said winding in response to rotation of said drive shaft; said wiper being connected to said amplifier plus inputs.