| 摘要 |
Control and positioning devices (146, 33) wherein a digital position signal is generated indicative of the position of a moveable element (44) between limits and is supplied to a comparator device (146) and where a digital signal is also provided to the comparator device indicative of a selected position of the element (44) where the comparator (146) device compares the two digital signals and operates actuator device (36) to move the element (44) in a corrective direction toward the selected position where movement terminates upon arrival of the element (44) at the selected position. |
