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Ram a slides in fixed guides b-b. Rigidly attached to the ram is cross-piece 2 which is connected by turning pairs F and G to links 5 and 6. Leaf spring 3 is connected by turning pairs D and E to links 5 and 6 and is rigidly attached to connecting rod 4. Crank 1 rotates about fixed axis A and is connected by turning pair B to connecting rod 4. When crank 1 rotates, ram 2 reciprocates along axis x-x due to the action of leaf spring 3. Connecting rod 4 has a screw-type adjustment that can change the position and length of the ram stroke.