Plate cam 3 rotates about fixed axis A. Follower 4 oscillates about fixed axis B and carries roller 14 which rolls along the working surface of cam 3. Roller 9 of cam 3 rolls along strip a which is rigidly attached to follower 10 and is held against roller 9 by spring 11. Workpiece 1 to be inspected is delivered by the feeding facilities onto bar 2. When cam 3 rotates, bar 2 travels along a path having the form of a closed rectangle: upward, to the left, downward and to the right. The up and down motions are provided by bellcrank levers 6, on which bar 2 lies, and springs 7 and 8. Levers 6 are oscillated by cam 3 through follower 4 and tie-rod 5. Motions to the right and left are provided by roller 9 of cam 1 through follower 10, tie-rod 12 and bracket 13, which is rigidly attached to bar 2.
$3258$CmL,M$