HYDRAULIC DRIVE MECHANISM OF A MACHINE TOOL TABLE WITH AUTOMATIC STROKE REVERSAL

Reversible pump 1 delivers fluid from the tank through directional valve 2 to the left end of power cylinder 3, moving piston 4 and table 5, rigidly attached to piston rod 6, to the right. The delivery line of gear pump 7 is connected through reversing rotary pilot valve 8 to the right end of valve 2 whose spool is in its extreme left-hand position. As piston 4 travels to the right, trip dogs a tu…