This diagram expresses the bottom of the doll. The left of the diagram is the front and the right is the back. A lever (a) has a fulcrum in the lower part and the upper end of the lever (a) is always pulled clockwise with the thread and the board spring (b). That is, the upper end of the lever (a) is always pulled back. The upper end of the lever (a) is connected with the handle (e) of the front wheel (d) through the coupling rod, using thread. The direction of the front wheel (d) is forward when the protrusion of rotation disk (c) does not touch with the tip of the lever (a). If the protrusion of (c) contacts (a) and moves the tip of (a) to the front, (e) will rotate clockwise and the doll will turn to the right. If the protrusion of (c) leaves from (a), (e) will rotate anticlockwise and a doll will turn to the right. This combination of (c) and (a) is the cam mechanism.
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