A motor friction transmission system under adjustable power characterized by the fact that the shaft that leaves the motor longer than normal or suitably elongated has a friction plate contactor connected to another driven piece-piece or is rigidly attached to the pulley which transmits movement to the machine which driven plate can rotate locally on the motor shaft is pressed against the motor friction plate by the action of a spiral spring whose tension is adjustable by means of a nut that threaded on the motor shaft is fixed to it located in a convenient place according to the desired transmission power up to the maximum limit allowed by the motor; the free end of said motor shaft is supported by a support that also gives rigidity to the transmitter assembly. (Machine-translation by Google Translate, not legally binding)
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