Means for suppressing vibration and noise in a device driven by a small

Abstract

In a device driven by a small size electric motor incorporated in the device, a rotating shaft, namely, an output shaft of the electric motor is biased by a force in a direction diametrically crosswise to a line connecting N-pole and S-pole of the field magnet of the motor. Aperture of the bearing for receiving the output shaft of the motor in its cross section normal to the output shaft is preferred to have a profile composed of a semicircle at its half part opposite to the direction of biasing and the other half of the aperture at the same side of the direction of the biasing is formed into a triangle so as to have tapered two planes for receiving the output shaft. By virtue of this aperture configuration, output shaft of the motor is forcibly against the tapered surfaces so as to be kept stable free from any undesirable vibration and noise.