| 摘要 |
PURPOSE:To provide a high sealing performance while maintaining a high speed performance by disposing a blade actuating section engagement mechanism in which the restraint of the supported section of a blade is freed in a direction vertical to a seating plane. CONSTITUTION:A blade actuating shaft 12 has at its lower end a blade supporting member 20 which is made in the form of a pair of protrusions in a direction vertical to a seating plane 14, to which a blade support pin 21 is attached, and a blade supported section 20 is drilled a support hole 22. The blade supported section 20 is so constructed that it is not restrained in the direction vertical to the seating plane 14. Therefore, a cause of a larger localized contact pressure caused by the misalignment of the spatial carried trajectory of the blade 10 and a gap 15 due to machining errors etc. is removed by the seating plane 14, blade cover 13 and a liner 16. |
