| 摘要 |
When the carriage of a machine is positioned at the reference position of the machine through coarse positioning and fine positioning, coarse positioning is first carried out so that the carriage can move in either direction according to the initial position of the carriage. The movement of the carriage is sensed by the combination of a platform mounted on the bed of the machine and a micro switch mounted on the carriage. The carriage is first moved at high speed and, when the carriage passes the reference point, it is moved at slow speed to return to the reference point. When the carriage again passes the reference position, coarse positioning finishes and fine positioning begins. In order to ensure coarse positioning in either direction and the change of direction of the carriage, a direction circuit is provided in a control unit of a numerical control system.
|
