Patent ID: 9411330
Filing Date: 2016-08-09
CPC Classification: G05B

Claim Text:
1. A numerical control device for a working machine capable of controlling a posture of a tool relative to a workpiece using rotational driving of a rotary drive axis about a machine control point, the numerical control device comprising: an interpolation unit configured to perform an interpolation process on moving data generated from a machining program, and output a position of the machine control point for each interpolation point; a coordinate transformation unit configured to transform the position of the machine control point to a position of a tool tip-point; a stroke-limit determination unit configured to determine that the position of the machine control point and the tool tip-point position fall outside a range of a movable region of the tool, determine whether the tool posture is changeable based on a comparison between a control point of the tool, which is placed outside the range of the movable region according to a position command, and an object of the position command, output a stroke limit signal indicating a stroke limit in response to the tool posture being unchangeable within the range of the movable region, and output a tool-posture changing command for instructing change of the tool posture in response to the tool posture being changeable within the range of the movable region; and a tool-posture changing unit that changes the tool posture in response to the tool-posture changing command.