In order to moving inside

摘要

(57) Abstract In order to move in the piston chamber (13) and the piston chamber (13), the piston (12) which is inserted is included, the cutting device of the web where the cutting blade (11) is installed in that piston. Via the bottom connected duct (32,33), it communicates the bottom part of the piston chamber (13), with the pressure chamber (30,31). In addition, via the upper part pressure duct (62,63), it communicates the upper part part of the piston chamber (13), with the pressure chamber (60,61). Furthermore, the stop buff section (17,18) of the piston (12) has been categorized to the apex of the piston chamber (13). From the piston (12) the bottom connected duct (16) which has opened on bottom of the piston chamber (13) of the lower part, has been located on bottom of the piston chamber (13). From the pressure chamber (30,31) underneath continuing, the connected duct (32,33), with the same height as the base of the piston chamber (13), has opened to the side wall (14,15) of the piston chamber (13) to with the piston chamber (13) directly. In that case, in addition as for the piston (12), with the piston chamber (13) and the pressure chamber (30,31), as a valve it operates.