Crank 1 rotates about fixed axis A. Connecting rod 5 is connected by turning pairs to crank 1 and to slider 6 which reciprocates in fixed guides. Table 2 slides along fixed guides and along slider 6. Table 2 is connected to the base by springs 3 and to slider 6 by spring 4 which is coiled on rod a. Rod a joins table 2 and slider 6. When crank 1 rotates, table 2 has a vertical vibratory motion along axis y-y due to the action of springs 3 and 4.
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