Motion generating mechanism for a music box

摘要

A motion generating mechanism particularly adapted for use in a music box is equipped with a vertical rod which can be actuated to swing back and forth and a pair of follower rods which are driven to rotate and repeatedly move up and down simultaneously. A shaft having one end engaged with the spring actuated rolling wheel of a music box is provided with an elliptic cam plate at each end thereof; and the bottom end of the follower rods having an abutment plate in contact with the elliptic cam plate are urged to move up and down and circularly. A rotation arm driven by the rolling wheel by way of a gear member and engaged with a swing follower having the vertical rod secured at one end is used to produce a pivotal swing motion of the vertical rod. Each abutment plate is provided with a recess which can be selectively engaged with a stop rod so as to restrain the follower rod from spinning and limit to move up and down only.