Bar 3 slides in fixed guide c. Link 2 has straight guiding slot b-b and circular guiding slot a-a of radius A͞B and with its centre at point A. Slider 1 turns about fixed axis B. Circular slot a-a of link 2 moves along slider 1. Bar 3 slides in straight guiding slot b-b of link 2. Motion of link 2 leads to reciprocation of rod 3 in fixed guide c. The mechanism is equivalent to a reciprocating-slotted-link mechanism.
$958$LG,4L$