Double spindle grinding machine

摘要

A double spindle grinding machine has a pair of grinding spindles mounted on feed tables for performing two independent grinding operations. A pair of work spindles for holding workpieces to be ground are rotatably mounted on a supporting frame which undergoes angular displacement in forward and reverse directions through an arc of 180 DEG to alternately position the workpieces held by the two spindles opposite alternate ones of the two grinding spindles. A swing shaft is connected to the supporting frame and is alternately driven in forward and reverse directions to displace the supporting frame to extreme forward and reverse positions so as to alternately position the workpieces in opposed relation to alternate ones of the grinding spindles. A clamping device coacts with the supporting frame to releasably clamp the frame in either extreme position, and the clamping device includes a pair of vertically slidable clamp rods connected through a linkage to a reciprocal fluid motor which effects upward and downward movement of the clamp rods between unclamping and clamping positions. A clamp block is secured to each clamp rod and coacts with a clamp member secured to the supporting frame to releasably clamp the frame in the extreme forward and reverse positions in response to actuation of the fluid motor to drive the clamp rods to the clamping positions.