Pump 1 delivers fluid through directional valve 2 to the left end of power cylinder 3, moving piston 4 to the right. Fluid from the right end of the cylinder is discharged through valve 2 and flow-control valve 5 to the tank. Relief valve 6 protects the system against overloads. A trip dog (not shown), mounted on the machine tool table, actuates lever 7 at the end of the piston stroke. Lever 7 turns about fixed axis A, turning latch 8 about fixed axis B and overcoming the resistance of spring 9. When lever 7 reaches its vertical position, it is shifted by spring 9 to its other extreme position. Pin a, mounted on lever 7, engages lugs d and b of the stem of the valve spool, shifting the spool to its extreme positions. At the moment the valve spool is shifted, the table is braked, fluid from the left end of the spool is delivered to the right end through passage 10 and flow-control valve 11. This valve can be regulated to obtain the required velocity of motion of the valve spool, ensuring smooth table reversal. Piston 4 is braked in the extreme position because projection f of the cylinder enters a recess in the piston with a small clearance. Fluid passing through the clearance has a cushioning effect. The system can be started and stopped by turning valve 12 which, in stopping, connects the delivery system to the tank.
$4192$CHP,Dr$