Circular slider 1 moves along circular guides a-a of radius A͞B and with the centre at point A. Connecting rod 3 is connected by turning pairs B and C to sliders 1 and 2 . Slider 2 moves in fixed guide b. When slider 1 oscillates along guides a-a, slider 2 reciprocates. The mechanism is equivalent to slider-rocker arm linkage ABC in which AB is the crank.
$1493$SC,4L$