The input blue crank carries the yellow pawl which engages two slots of the orange disk to make the violet slider reciprocate with dwell in the middle of its stroke. The pink cam controls the pawl by pushing the pawl pin.
1 working cycle of the mechanism corresponds 2 revolutions of the blue input crank.
Angle between the two slots on the orange disk is not 180 deg.
The device (a ball plunger) to keep the slider immobile during its dwell is not shown.