Patent ID: 9665084
Date: 2017-05-30
CPC Classifications: E06B,G05B

Claim:
1. A winding device for a screen, including a winding drum for winding the screen, which can rotate around an axis of rotation with respect to a stationary frame of reference over more than one revolution between at least one first end-of-travel position and a second end-of-travel position; a motor assembly comprising a motor equipped with a stator intended to be fixed to a stationary support and a rotor kinematically connected to the winding drum; a first measurement assembly comprising a first encoder secured to the rotor, a first sensor for reading the first encoder and generating a first counting signal when the first encoder turns; and first processing means generating, as a function of the first counting signal, a first signal indicative of the position of the screen, the first signal being monotonic when the drum moves from the first end-of-travel position to the second end-of-travel position; a second measurement assembly for detecting at least one indexed position of the drum per revolution of the drum in the fixed frame of reference, a calibration memory for storing at least one first calibration value for the first signal indicative of the position of the screen in the indexed position of the drum; and a comparator for delivering at least one first quantitative algebraic comparison between a current value of the first signal indicative of the position of the screen as measured on passing through the indexed position during an observation phase and the first calibration value.