Converting continuous rotary motion into intermittent rotary one.
Input is the violet shaft.
The green double conrod oscillates on eccentric portion of the violet shaft. The magenta slider moves in slot of the pink oscillating runway. The red slider moves in slot of the yellow fixed runway and keeps the blue output disk immobile during its dwells.
The blue output disk of Z slots rotates 1/Z rev. during 1 rev. of the input shaft.