Cam 1 reciprocates in fixed guides A-A and has groove aabb in the shape of a parallelogram. Follower 2 reciprocates in fixed guide B and carries roller 3 which rolls and slides along groove aabb. When cam 1 reciprocates, groove aabb acts on roller 3, reciprocating follower 2 in a direction perpendicular to the travel of cam 1 with dwells while the roller passes along horizontal portions aa and bb of the groove. Latches 4 and 5, actuated by flat springs 6 and 7, prevent the roller from reversing its direction of travel along the groove.
$3095$SmC,ML$