Disk 1, having slot a, rotates about fixed axis A. Link 4 reciprocates in fixed guide d. When disk 1 rotates, motion is transmitted through connecting rod 3 to link 4. Connecting rod 3 is connected by turning pairs B and C to links 2 and 4. Link 2 slides in slot a of disk 1 and is activated by spring 5 whose other end bears against strip 7 which is secured to disk 1. Roller b is mounted on pin B. While roller b is not in contact with surface c-c of special profile on fixed cam 6, point B describes a circle of radius A͞B and link 4 reciprocates. But when roller b comes into contact with cam 6 whose surface c-c is a circular arc of radius C͞B, link 4 stops. The dwell is determined by working angle α of cam 6. Roller b is held in contact with the cam by spring 5.
$1702$LC,D$