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By means of connecting rod 2, connected by turning pair A to angle lever 3, motion is transmitted from eccentric 1, rotating about fixed axis C, to reciprocating rod 4. Lever 3 is connected by turning pair D to the rod and by turning pair B to lever 5 which, in turn, is connected by turning pair E to link 6. Stem a, mounting spring 7, is secured by one end in pivot A and the other end passes through a guide hole in pivot E. Preloading of the spring is regulated by nuts b. At a high load which stops the rod, the connecting rod is turned by eccentric 1 about point B so that levers 3 and 5 are turned and compress spring 7.