Transmission mechanism, notably for typewriters

A transmission mechanism, notably for a typewriter, comprising a rotary member provided with a pulley, a flexible elongate connection fixed to the pulley and to an attachmemt piece, and a movable member bearing against the flexible connection between the attachment piece and the pulley to modify the path of the flexible connection and produce a corresponding angular displacement of the rotary member, wherein the pulley is formed of an at least partially toothed wheel, and the flexible connection is formed of a notched belt whose notches form a toothing engaging in teeth of the toothed wheel, the toothed wheel having means defining a discontinuity in its periphery, said discontinuity means being formed by a toothed lip extending towards the center of the toothed wheel and disposed facing a bearing surface, the distance between the bearing surface and the toothed lip corresponding to the thickness of the notched belt, whereby said toothed lip and notched belt may be readily engaged and disengaged in different relative positions for adjustment.