Crank 1 rotates about axis A of movable frame 4. Slider 13 moves in the guides of the frame of screen 2 and is spring-loaded by spring 8. The frame of screen 2 is suspended from frame 4 by suspension links 5, pivoted to the frame. The frame of screen 2 has bracket a. Frames 2 and 4 are spring-loaded by springs 6. The frame of screen 3, suspended by links 9, is spring-loaded by springs 10. Movable frame 4 rests on rollers 11 and is connected to the foundation by springs 12. When crank 1 rotates, screens 2 and 3 have complex vibratory motions.
$2152$EL,VM$