Crank 1 rotates about fixed axis E. Through intermediate link 5, connected by turning pair F to connecting rod 6 of four-bar linkage ABCD, crank 1 transmits motion to driven link 2. Turning axis A of link 7 is on link 4 which turns about fixed axis K.• Link 4 is rigidly secured to worm wheel segment a which meshes with worm b of link 3. Upon rotation of crank 1, driven link 2 oscillates. The angle of oscillation of link 2 can be varied by turning link 3 which, by means of worm b and worm wheel segment a, changes the position of hinge A. Adjustment may be made during operation.
$616$LW,ML$