Cylindrical side cam 1 rotates about fixed axis A-A. Cam surface a is obtained by cutting a hollow cylinder with a plane making a certain angle with axis A-A. Follower 3 reciprocates in fixed guide B along axis D-D, parallel to axis A-A, and carries barrel-shaped roller 2 which rolls along surface a of cam J. Roller 2 is held in contact with cam 1 by gravity or by a special spring (not shown).
$3030$SmC,3L$