Movement No. 95 converts continuous rotary motion into reciprocating rectilinear motion using an oblique disk mounted on an upright rotating shaft. The disk is fixed to the shaft at an angle — not perpendicular to it. As the shaft rotates, the tilted disk causes its upper surface to rise and fall in a cyclic pattern. An upright rod rests on this surface and is guided vertically, so it is pushed upward as the high side of the disk passes beneath it, then falls back down as the low side comes around. This mechanism produces a smooth sinusoidal reciprocating motion similar to a cam or eccentric, and is particularly useful where the rotary input and reciprocating output share the same axis — as seen in certain pump and compressor designs.
95. On rotating the upright shaft, reciprocating rectilinear motion is imparted by the oblique disk to the upright rod resting upon its surface.