Driving gear rack 1 reciprocates along fixed guides d-d and meshes with gear 2 which rotates about fixed axis A. When gear 2, keyed on shaft 3, begins to rotate, grips 4, held in their extreme left-hand position by springs 5, approach each other and clamp workpiece a. Grips 4 are nuts screwed on right- and left-hand screw threads b. Screw threads b are integral with shaft 3. When workpiece a is clamped, shaft 3 no longer rotates within grips 4, and the latter, overcoming the tension of springs 5, turn and carry the workpiece to its next station. When rack 1 travels in the reverse direction, screw threads b are screwed out of the nuts, grips 4 are spread apart and release workpiece a. Then springs 5 return grips 4 to their initial positions.
$2390$SG,SF$