When valve spool 2 is shifted to the right, pump 1 delivers fluid to the upper end of power cylinder 3 whose piston 4 is linked to the work clamping and feeding fixtures (not shown). In its downward working stroke, piston 4 clamps the work and advances and feeds it to the cutting tool. Fluid from the lower end of cylinder 3 is delivered to the lower end of cylinder 5. This moves piston 6 upward, releasing the finished work from the fixture (not shown) and returning the fixture to the initial position. To obtain a rapid return stroke, speed regulator 7 is turned on and fluid from it is delivered to the lower end of cylinder 5. Thus, the upward return stroke of piston 6 is faster than the downward working stroke of piston 4. As soon as piston 6 reaches its upper extreme position, the increased pressure operates valve 8, which connects the lower end of cylinder 5 to the tank. Valve spool 2 is shifted over during table travel by trip dogs which energize solenoids a of the valve. Check valve 10 prevents the fluid from being discharged during operation. Relief valve 9 maintains the required fluid pressure in the system. After spool 2 is shifted to the left, the cycle is repeated in the opposite order. The delivery line is connected to the upper end of cylinder 5 and its piston operates the fixture that clamps the work and feeds it to the cutting tool. Fluid from the lower end of cylinder 5 is delivered to the lower end of cylinder 3, to which fluid is also delivered from the speed regulator. Piston 4 moves rapidly upward, releasing the finished work and returning the fixture to the initial position.
$4287$CHP,GC$