| 摘要 |
PURPOSE:To contrive the positioning stop of a small stop error to be executed, by inertia-running a truck once with low speed wheels between a first reduced speed point and a second reduced speed point. CONSTITUTION:When a truck 2 is advanced by the thrust of a linear motor 3 to come to a first reduced speed point A and an approach switch 10 is worked, then reversed phase current is permitted to flow to a main circuit. By this method, the truck 2 is suddenly speed-reduced, and when the speed is lowered to come to a specified level, then the reversed phase current is turned OFF. After that, the truck 2 is inertia-run. When the truck 2 comes to a point B and an approach switch 11 is worked, then the reversed phase current is conducted again and the truck 2 is speed-reduced. When input pulse signal detected by a photoelectric sensor 9' comes to a set cycle or more, then the output of reversed phase damping stop signal is directed to a sequencer 12 from a speed comparator circuit 18, and the truck 2 is speed-reduced to be stopped. As a result, exact positioning stop can be executed. |
