Cam 1 with recess a is rigidly attached to slider 5 which reciprocates along fixed guides d-d. Link (follower) 2 slides along slider 5 and is connected by turning pair A to latch 3 which carries two rollers 6 and 7. Fixed cam 4 has recess b. When slider 5 travels to the left, recess a catches roller 7, turning latch 3 counterclockwise about axis A, and follower 2 also travels to the left with slider 5. When slider 5 travels to the right, roller 6 drops into recess b, turning latch 3 clockwise and retracting roller 7 from recess a, so that follower 2 has a dwell.
$3065$SmC,4L$