Round eccentric plate cam 1 rotates about fixed axis A. Follower 2 oscillates about fixed axis F and carries roller 7 which rolls along the contour of cam 1. Link 3 is connected by turning pairs C, E and D to slider 8, link 9 and to link 4 which oscillates about fixed axis B. Slider 8 moves along the axis of follower 2. Link 9 turns about axis K whose location can be varied and locked in the required position by lever 6 which turns about fixed axis L. Arranged between link 4 and member 5 are rollers a and springs f. Member 5 rotates freely about axis B. When link 4 turns counterclockwise, rolls a are jammed between link 4 and member 5, turning the latter in the same direction. When cam 1 rotates continuously, member 5 rotates intermittently counterclockwise. The amplitude of oscillation of link 4 is varied by turning lever 5 and locking it in the required position.
$3195$CmL,D$