Motion controller and synchronous control process therefor
AssigneeMitsubishi Denki Kabushi Kaisha
InventorKimio Saito
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Abstract
In a system including a machine tool which operates on conveyed workpieces, a motion controller for the NC-controlled machine tool is improved by performing compensation for conveyor movement outside of the operation processor, so that compensation may be performed without modification of a machining program which does not take conveyor movement into consideration.
Claims4
A method of synchronizing the speed of a machine tool which operates on a workpiece with the speed of a conveyor which carries the workpiece, said machine tool being controlled by regular machine commands with regard to a stationary frame of reference, comprising the steps of:
- detecting when a workpiece passes a predetermined fixed position;
- determining the speed of the conveyor;
- calculating an offset distance value which decreases as the conveyor speed increases;
- generating a speed synchronization command during the controlling of the machining of the workpiece on the conveyor, based on said offset distance value, for starting to move the machine tool from an initial position when the workpiece has moved a distance equal to said offset distance value past said predetermined fixed position;
- and
- combining said speed synchronization command with said regular machine command to form a combined command such that said machine tool being controlled by regular machine commands with regard to a stationary frame of reference can then be controlled with regard to a moving frame of reference.
Dependencies are inferred from the claim text.