Crank 1 rotates about fixed axis A. The frame of screen 2, suspended on links 4, is connected to crank 1 by spring 11. The frame of screen 3 is suspended from links 5. Slider 8 moves along fixed guides a. The frames of screens 2 and 3 have brackets b. The frames of screens 2 and 3 and slider 8 are spring-loaded by springs 6, 7, 9 and 10. When crank 1 rotates, screens 2 and 3 have complex vibratory motions.
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