The head of the doll is rotated around an axis (a). Since the lower part of the head of the doll is always pulled with the board spring (b), the head is perpendicular when the protruding part of rotation disk (c) does not touch a lever. If (c) rotates and the protruding part raises a lever, an clockwise Moment will generate around the axis (a), and the doll will bend the head, that is, the doll will bow. If a lever leaves from the protruding part of disk (c), the head will become perpendicular again. The disk (c) and the lever constitute the cam mechanism.
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