Importance

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Abstract

The present invention concerns a fast roll-up door for closing an aperture (20), said roll- up door comprising:

(a) a curtain (1) having two opposite and parallel lateral edges extending along a longitudinal direction, and two opposite end edges joining the lateral edges, the curtain comprising a continuous bead (3b) extending parallel and adjacent to each of the two lateral edges, said continuous beads (3b) being held in,(b) a pair of elongated guiding rails (4) suitable for interacting with the continuous beads (3b) of the lateral edges of the curtain, for holding said lateral edges, and for guiding them as the curtain is being wound or unwound about a rotating axle, X1, characterized in that, the curtain comprises a plurality of windows (8) of same geometry and evenly distributed along a line the continuous beads (3b) of the lateral edges of the curtain and in that, the roll-up door further comprises a speed device (10) for detecting and monitoring during the winding and unwinding of the curtain about the rotating axle, X1, of the time sequence of passage of the windows (8) before a fixed point, and thus for determining the instantaneous translation speed of the curtain along the guiding rails (4).

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First Claim