| 摘要 |
A shaker apparatus includes structure for effecting orbital motion in a beam member which forms a part of the apparatus. The beam includes two spaced apart points located at opposite ends of the beam. A set of resiliently flexible metal spring means in the form of a rectangle has two of its sides respectively connected to the two spaced apart points on the beam. The other two remaining sides of the rectangle are connected to two fixed supports. The relationship between the two fixed supports and the two points on the beam is such that an imaginary line joining the two points on the beam member is transverse to and intersected by an imaginary line joining the two fixed supports. The beam is driven by a flywheel and crank mechanism which in turn is driven by a synchronous motor or a pair of synchronous motors. A pair of rigid crossed wires may be employed to brace the opposite corners of the spring rectangular in order to prevent angular oscillation of the beam member during orbital motion.
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