| 摘要 |
<p>The control system comprises an encoder (20) related to the winding drum of the shutter and is constructed in such a way as to generate sequences of pulses (I17, I18) indicating both the angle and the direction of rotation of the drum (3) and a control pushbutton panel (2, 2M, 2S) including a microprocessor (32) which at each movement of opening or closure counts the pulses (I17, I18) of said sequences so as to subtract, from the pulses relating to the rotation commanded, any pulses relating to a contrary rotation, enters in a memory (34) the result of said count and at the next movement of opening or closure compares it with a prememorised count indicating a required position of opening or closure in order to command correspondingly said subsequent movement for a stroke which depends on the result of said comparison. The system can be produced in the form of a closed loop network comprising a plurality of control pushbutton panels (2, 2M, 2S) for the same number of roller blinds or shutters; in this case one of the control pushbutton panels is of the MASTER type (2M) with the possibility of simultaneous and timed control of the other pushbutton panels, which are of the SLAVE type (2S). <IMAGE></p> |
