Sifting machine

摘要

A sifting machine includes a screen; a plurality of spaced leaf springs supported below the screen and extending transversely to the length dimension of the screen; and a drive connected to the leaf springs for causing each leaf spring to periodically bend away from the screen and subsequently move rapidly towards the screen to intermittently beat the latter. The active beating length of each leaf spring is somewhat less than the useful width of the screen. There are further provided a downwardly resiliently yielding support for opposite ends of the active beating length of each leaf spring and a cable or the like attached to the mid portion of each leaf spring. The cable forms part of the drive for agitating each leaf spring.