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Abstract

A power transmission device for converting rotational movement of a rotation shaft having a rotation shaft axis and a top end, into oscillatory movement having a primary component of movement in a direction perpendicular to the rotation shaft axis in a plane parallel to or containing the rotation shaft axis, includes a recessed portion formed in the top end of the rotation shaft, a bearing with an outer race rockably mounted in the recessed portion, an inner race positioned within the outer race, and balls positioned between the outer race and the inner race for permitting relative rotation between the outer race and the inner race, an extending link having a first end fit in the inner race such that rotation of the rotating shaft causes rotation of the outer race therewith about the inner race, the link also having a second, opposite end, a rotary plate, a pin for connecting the rotary plate to the second end of the extending link, the pin having a central axis, and a supporting mechanism for providing that the rotary plate moves with the oscillatory movement in a direction such that the component of the oscillatory movement is perpendicular to the rotation shaft axis and is perpendicular to the axis of the pin.

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First Claim