The body of screens 3 is mounted on hollow shaft 2 which rests on springs 4 and is connected by spring 5 to the drive powered by electric motor b. Shaft 1 runs in bearings mounted inside shaft 2 and carries unbalanced mass m. Shaft 1 is driven by electric motor a. Shafts 1 and 2 run at different speeds and screens 3 both rotate and have a vibratory motion.
$2158$EL,VM$