Crank 1, turning about fixed axis A, carries roller 3 which slides along slot a-a of slider 2. Slider 2 moves along fixed guides b-b. Portion ce of slot a-a is straight while portion ed is a circular arc of radius A͞B. When crank 1 oscillates, link 2 reciprocates with a dwell at one end of its path (shown by dash lines) while roller 3 slides along the circular portion ed of slot a-a.
$1340$LG,D$