Patent ID: 7219638

Claim:
Apparatus comprising: a cam having a cam rotational axis, a cam central plane perpendicular to the cam rotational axis, and a cam outer face; a follower having a contact face in contact with the cam outer face and which undergoes an oscillating reciprocating movement along a follower longitudinal axis when the cam rotates, the follower positioned relative to the cam such that the cam central plane is offset with respect to the follower longitudinal axis by an eccentricity E 1 measured parallel with the cam rotational axis, whereby the eccentricity E 1 causes the follower to rotate about the follower longitudinal axis when the cam rotates about the cam rotational axis; wherein at least one circumferential groove is formed in the cam outer face and extends at least partially around the cam, and further wherein |E 1 |≦0.5 NB, where NB designates a width of the cam measured parallel with the cam rotational axis.