Automatic cancelling mechanism of a turn indicator

The mechanism has a detection unit (101) comprising a disc (120) provided with, on a side, electrical tracks (122, 123), and two blades (124, 125) disposed opposite to the side. The detection unit detects the rotation of a flywheel (102). The blades contact with the corresponding tracks when the flywheel is in rotation. The side extends in a plane perpendicular to a rotation axis (PP`) of the flywheel.