Left mechanism:
Blue cam contains various profiles. Its follower has some identical pins. This design helps reduce cam dimension and avoid cam-follower contact near to the cam center.
Geometric closure by pins causes a considerable backlash.
Right mechanism is shown for comparison purpose.
Red cam has continuous profile of Archimedean curves. Its dimenssion is to be large to reduce presure angle at cam-follower contact points near to the cam center.