Oscillating lever 1 imparts reciprocating motion to slide 2 through slide 3, rod 5 and spring 4 which is designed for a definite tension. When slide 2 is overloaded and the resistance to its motion exceeds the tension of spring 4, lever 1, in its travel to the right, compresses spring 4. At this pawl 6 slides along bevelled end a of rod 5 and raises latch 7 which slides in fixed guide p. Latch 7 disengages lever 8 from pin 10. Spring 9 shifts lever 8 to the right, thereby disengaging the drive.
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