FIELD: mechanical engineering. SUBSTANCE: drive mechanism has frame, electric engine provided with drive pulley and mounted on frame, driven pulley and movable intermediate pulleys mounted on shaft, belt transmissions for connecting driven and intermediate pulleys, and tension member. Electric engine is mounted on frame through pivotally connected hanger and intermediate pulleys are fixed on frame by lever. Shafts of lever and hanger are positioned at one side of intermediate pulleys. Lever shaft is spaced from intermediate pulleys by larger distance than hanger shaft. Belt tension member is made in the form of adjusting stop mounted on frame for restricting angle of rotation of hanger toward intermediate pulleys. EFFECT: simplified construction and enhanced reliability in operation. 1 dwg
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