| 摘要 |
PURPOSE:To precisely control nozzle intervals by sending driving signals to a driving source from a driving signal generator based on the necessary moving quantity and a new driving direction upon operating the necessary moving quantity for a nozzle side plate and deciding the new driving direction. CONSTITUTION:A present position of a nozzle side plate 3 and a driving direction of the nozzle side plate 3 theretofore are always stored by an electronic computer 11. Simultaneously therewith, when a new set position is inputted to the electronic computer 11, a necessary moving quantity of the nozzle side plate 3 is operated as a difference between the present position and the set position. Next, a new driving direction is decided from magnitude relationship between the present position and the set position. When the new driving direction and the last driving direction are different to each other, a predetermined correction quantity is added to the necessary moving quantity. Driving signals are sent to a driving source 8 from a driving signal generator based on these necessary moving quantity and the new driving direction. It becomes possible thereby to correctly set position of the nozzle side plate 3 and to precisely control nozzle intervals. |
