When link 1 reciprocates, its motion is transmitted through levers 3 and 4, and link 5 to slider 2 which feeds the workpieces into the press. Lever 3 turns about fixed axis B and is connected by turning pair C to lever 4 which enters a slot of plunger 7 and is subject to the force of spring 6. When slider 2 is subject to an overload, occurring when the workpieces being fed jam, the slider stops and lever 4, overcoming the resistance of spring 6, comes out of the slot of plunger 7. This enables lever 8 to turn about axis A due to the action of spring 9. At this, plunger 7 moves upward, compressing spring 10. Turning together with lever 8 about axis A and tensioning spring 14 is lever 11 whose dog 12 disengages link 13. Link 13 is turned by a spring which is not shown, disengaging the clutch of the press. When the obstruction to workpiece feed has been eliminated, dog 12 is brought into engagement again with link 13. Compressed spring 10 shifts plunger 7 to its lower position in which it prevents lever 8 from turning. Lever 4 is pulled by spring 6 back into engagement with plunger 7, and reciprocating motion is again imparted to slider 2 which again feeds workpieces into the press.
$1669$SC,SF$