| 摘要 |
PURPOSE:To control a gas injection speed to an optimum value, by providing a signal generator circuit for supplying a control signal to a piston driver circuit and a gas injection speed setting means for controlling the control signal from the signal generator circuit to the driver circuit. CONSTITUTION:A gas injection amount is set, and a gas injection speed is also set by a switch of a gas injection speed setting means. When a gas injection start switch is depressed, a pulse motor 10 is reversely rotated to move a piston pushing base 12 to a start point. Next, when a start point detection switch 14 is turned on by a pawl 15 of the base 12, a supply valve 16-a is opened to fill the gas into a cylinder. Then, a leak valve 19 is closed, and injection valves 17 and 18 are opened, and the pulse motor 10 is forwardly rotated to inject the gas. |
