Rocker arm 4 of four-bar linkage DCBA turns about fixed axis A. Driven link 2 is oscillated through intermediate link 5 which is connected by turning pairs B and E to links 4 and 2. Turning axis A of link 4 is on link 6 which turns about fixed axis G. Link 6 is designed as slotted lever a along which pin b of nut 7 slides. Nut 7 is connected by a screw pair to screw 3. Upon rotation of crank 1, driven link 2 oscillates. The angle of oscillation of link 2 can be varied by changing the position of axis A by means of screw 3. Adjustment may be made during operation.
$617$LW,ML$