Abstract: A rotational force transmitting device includes: an inertia wheel connected to an output gear; a spindle coupled freely rotatable to the center of the front surface of the inertia wheel; a power transmitting eccentric body extended vertically with respect to the rotary shaft of the spindle; an insert pin inserted into a guide hole, a position restoring spring inserted into the guide hole, for elastically supporting the insert pin in a backward direction; and a balance weight coupled rotatably to the rear surface of the inertia wheel, the balance weight rotating with the centrifugal force generated by the rotation of the inertia wheel to push the insert pin forward to allow the insert pin and the power transmitting eccentric body to be engaged with each other.

Abstract: The present invention provides a rotational force transmitting device including: an inertia wheel 100 connected to an output gear 22 rotating engagedly with a driving motor 11 and rotating by receiving the rotational force of the driving motor 11; a spindle 200 coupled freely rotatable to the center of the front surface of the inertia wheel 100; a power transmitting eccentric body 210 extended vertically with respect to the rotary shaft of the spindle 200 from one side of the spindle 20; an insert pin 300 inserted into a guide hole 110 formed passed through the front and rear surfaces of the inertia wheel 100; a position restoring spring 320 inserted into the guide hole 110, for elastically supporting the insert pin 300 in a backward direction; and a balance weight 400 coupled rotatably to the rear surface of the inertia wheel 100, for supporting the rear end periphery of the insert pin 300, the balance weight 400 rotating with the centrifugal force generated by the rotation of the inertia wheel 100 to push t