| 摘要 |
PURPOSE:To prevent the vibration of a timer piston caused by the fluctuation of the counterforce of a torque applied to a roller holder by separating a hydraulic chamber from a chamber via a servo valve and by trapping hydraulic pressure within the hydraulic chamber. CONSTITUTION:A timer piston 24 is slidably arranged in a cylinder 23, and the cylinder is divided by this piston 24 into a hydraulic chamber 25 and a low pressure chamber 26. The hydraulic chamber 25 is disconnected from a chamber 3 by means of a servo piston 33 except when the pressure within the hydraulic chamber 25 is corrected. In this way, the vibration of the timer piston 24 caused by the fluctuation of the counterforce of a torque applied to a roller holder 8 can be prevented because no fuel oil goes in and out. |
