| 摘要 |
A screening machine in which screens or portions of screens of elastic material and having substantially the shape of conical frustums are arranged one below the other. The circular edges of the screens are supported by holders which are mounted to a rotating shaft by means of bearings. The bearings of alternate holders being mounted on eccentric crank pins to drive such holders, without their rotating, in a substantially circular horizontal oscillatory motion to impart to each screen a rapid vibratory motion in which every section thereof participates. The vibratory motion results from a portion moving into and out of tension in conjunction with the rotation of eccentric crank pins.
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