Cam 1 rotates about fixed axis A and has four profiled working surfaces a which are tapered to one side, as shown at b, down to the base circle of the cam. Four followers 2 reciprocate in fixed guides B and carry rollers 6 which roll along working surfaces a of cam 1. Cam 1 can be adjusted along axis A and is held in its right-hand position by spring 7. This adjustment is made by four-bar linkage CDEF of which links 3 and 5 turn about fixed axes C and F, and projection c of link 5 engages groove d of cam 1. Connecting rod 4 is connected by turning pairs D and E to links 3 and 5. By making the axial adjustment of cam 1 and clamping link 3 in the required position, various lengths of stroke of followers 2 can be obtained.
$3235$CmL,LL$