Transmission mechanism capable of suppressing vibrational noise

A transmission mechanism comprising:

• a motor having an output shaft;
• a gear train driven by the output shaft of the motor, said gear train having a plurality of gears and gear shafts for the gears;
• and
• a base plate supporting the motor and the gear train, said base plate having a main part, a motor base part to which the motor is attached, and bearing parts, each of the bearing parts supporting a respective one of the gear shafts for the gears of the gear train;
• said base plate having an elastic modulus in the range of 1.0.times.10.sup.4 to 9.0.times.10.sup.4 kgf/cm.sup.2, said base plate comprising a synthetic resin;
• said motor base part being connected to the main part of the base plate by flexible synthetic resin connecting members, and each of said bearing parts being connected to the main part of the base plate by flexible synthetic resin connecting members;
• said plurality of gears including a pinion, mounted on the output shaft of the motor, and component gears;
• and
• the component gears of the gear train including flexible gears, each of said flexible gears being supported for rotation on a gear shaft set on a respective bearing part connected to the base plate by flexible synthetic resin connecting members, and each of said flexible gears having a rim provided on its outer circumference with teeth, a hub, and flexible synthetic resin arms connecting the rim to the hub;
• each of said flexible gears having an elastic modulus in the range of 1.0.times.10.sup.4 to 9.0.times.10.sup.4 kgf/cm.sup.2, each of said flexible gears comprising a synthetic resin.