| 摘要 |
<p>PROBLEM TO BE SOLVED: To impart a sufficient reaction force to a floating cutter.SOLUTION: A spring 4 includes: a cylinder 40; a compressive fluid 41 filled in the cylinder 40; a piston 42 for reciprocating in the cylinder 40; a piston rod 43 connected to the piston 42; a back-up ring 44 for slidably holding the piston 42 and for restricting movement of the piston 42 in aβdirection; a seal material 45 for sealing the compressive fluid 41 in the cylinder 40; a guide ring 46 for pushing the back-up ring 44 and the seal material 45 into the cylinder 40; and a screw 48 for air bleed which is screwed with a screw hole 402 for air bleed formed at an end surface 400 of the cylinder 40. When setting an initial pressure to the spring 4 by compressing the compressive fluid 41, air inside the cylinder 40 is discharged to the outside of the cylinder 40 via a gap between a screw groove and a thread of the screw hole 402 for air bleed and the screw 48 for air bleed.</p> |
