The cam is commonly defined as a body mechanic for the transformation of rotary motion in motion alternating intermittent. Leonardo, interested in automation in the field of work, applied, as a simple device, the percussion of a hammer on an anvil. A crank infulcrata directly to the cams, the movement activates the rotation. This, which has a circular suddenly broken, on which the lever, which is connected a hammer, turning ago tilt the stick, which returned to the starting position when the cam has completed the lap. Only then, by law of gravity, the lever is falling heavily sull'incudine the hammer, launching a process of automation, which relieves fatigue and save energy by human activity.
C. 1497. Code of Madrid