GEWINDESCHLEIFMASCHINE

摘要

A thread grinding machine has a bed (1) provided with a worktable (2) having supports (3, 4) for a workpiece (5) and a wheelhead (20) carrying a grinding wheel (39) and its rotation drive (40). A workpiece rotation drive (10) is operatively connected to a worktable reciprocation drive (14) and, via a controlled clutch (33), to a relieving mechanism (28) which is connected to a means for orienting the workpiece at the initial moment of machining upon engagement with the surface of the grinding wheel when a cam (30) of the relieving mechanism (28) is in the initial position, the orienting means having a series circuit including a pick-up (44) sensing engagement of the grinding wheel the workpiece, an engagement pick-up electric signal to pulse signal converter (45) and a controlled clutch engagement control unit (43) which produces a control signal in response to any signal but the first received from the pick-up (44). <IMAGE>