Motorized drive device, sliding window for a building and associated home automation system A motorized drive device comprises an electromechanical actuator (6), a flexible element (9), a winding pulley (19) and a support (57) . The pulley (19) is configured to be rotated by an output shaft (8) of the actuator (6) and configured to wind and unwind first and second strands (9a, 9b) from the flexible member (9). ). The pulley (19) is assembled on the support (57). The support (57) comprises a first immobilizing element (58) of the first strand (9a) and a second immobilizing element (59) of the second strand (9b). The first immobilizer (58) is configured to hold a portion of the first strand (9a) extending between the pulley (19) and the first immobilizer (58) in tension. Further, the second immobilizer (59) is configured to hold in tension a portion (9bt) of the second strand (9b) extending between the pulley (19) and the second immobilizer (59). Figure for the abstract: Figure 5
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