Slider 2 moves with respect to lever 1 which is rigidly mounted on shaft A. Slider 2 engages grooves of crank 3. When crank 3 rotates, slider 4 is reciprocated by connecting rod 5. When lever 1 rotates, pin a of slider 2 runs up against bevel c of fixed cam 6 and travels along the cam. At this, slider 2, overcoming the resistance of spring 7, is shifted to the left, disengaging groove b of crank 3. When this occurs, slider 4 stops in a definite position indexed by spring-loaded stop 8. Upon further rotation of lever 1, slider 2 engages groove d of crank 3 and slider 4 starts moving again. Thus, slider 4 reciprocates with dwells.
$1648$SC,D$