Frame 3 of the screen is clamped on fixed frame 5 by bolt 6 which can be adjusted along circular guide 7 and clamped with the screen inclined at the required angle. Body 2 of the screen is connected to frame 3 by four S-shaped springs 4. Mounted on shaft 1 of body 2 is unbalanced mass m. When shaft 1 rotates, the body of the screen has a vibratory motion due to the action of unbalanced mass m and springs 4.
$2151$EL,VM$