Crank 1 rotates about fixed axis A. Slider 2 moves in fixed guides and is connected by spring 4 to crank 1. Slider 3 moves along a fixed guide and is connected by spring 6 to slider 2. Sliders 2 and 3 are spring-loaded by springs 5 and 7. When crank 1 rotates, sliders 2 and 3 have vibrating motions along axis x-x due to the action of springs 4, 5, 6 and 7.
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