Movement No. 85 converts continuous rotary motion into intermittent vertical reciprocating motion, simulating the action of a drop hammer or ore stamper. A shaft carries two cams (or wipers) that rotate continuously. As each cam passes, it presses against the projection (B) on the rod (A), lifting it upward. Once the cam clears the projection, the rod falls back down under its own weight, delivering a powerful impact blow. With two cams mounted on the same shaft, the rod is lifted twice per revolution, producing a rapid and repeated stamping or hammering action. This mechanism was historically used in ore-stamping mills, forge hammers, and pulverizing machinery.
85. Intermittent alternating rectilinear motion is given to the rod, A, by the continuous rotation of the shaft carrying the two cams or wipers, which act upon the projection, B, of the rod, and thereby lift it. The rod drops by its own weight. Used for ore-stampers or pulverizers, and for hammers.