Boots – shoes – and leggings
Patent
1991-09-16
1993-11-23
Ruggiero, Joseph
Boots, shoes, and leggings
36447411, G05B 1918
Patent
active
052650278
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a system for controlling three-dimensional coordinate transformation in a computerized numerical control apparatus for controlling a machine tool having a plurality of heads, and more particularly to a three-dimensional coordinate transformation control system which is capable of simply calculating three-dimensional coordinate transformation.
DESCRIPTION OF THE RELATED ART
Machine tools with a plurality of heads are used to machine a plurality of identical workpieces simultaneously. These heads are parallel-controlled by a computerized numerical control apparatus. While the machine tools with plural heads are generally controlled according to a single machining program, the heads are controlled by respective internal calculations, e.g., preprocessing calculations.
When three-dimensional coordinate transformation is to be executed with respect to conventional parallel axes, it has been customary to determine transformation formulas for the respective heads and effect calculations according to the determined transformation formulas even though the same motion command is given. Stated otherwise, as many coordinate transformation calculations as the number of heads used have been carried out.
Since the three-dimensional coordinate transformation is calculated using a transformation matrix, however, the amount of calculations needed is considerable, placing a large burden on the processing time of the computerized numerical control apparatus.
With the parallel-axis control, if the same motion command is given, then coordinates that have been transformed into the three-dimensional coordinate system are common for the heads. Therefore, the three-dimensional coordinate transformation may be calculated with respect to only one of the heads, and the calculated coordinates for the head may be employed with respect to the other heads without calculating the three-dimensional coordinate transformation for those other heads.
SUMMARY OF THE INVENTION
In view of the above drawbacks of the conventional three-dimensional coordinate transformation control system, it is an object of the present invention to provide a three-dimensional coordinate transformation control system which is capable of simply calculating three-dimensional coordinate transformation.
In order to achieve the above object, there is provided in accordance with the present invention a system for controlling three-dimensional coordinate transformation in a computerized numerical control apparatus for controlling a machine tool having a plurality of heads, comprising pre-processing calculating means for decoding a machining program, effecting three-dimensional coordinate transformation for a first head, and outputting pulse distribution data, and a plurality of pulse distributing means associated respectively with the heads of the machine tool, for distributing pulses In response to the pulse distribution data from the preprocessing calculating means.
The preprocessing calculating means executes three-dimensional coordinate transformation for only a first head. For the other head or heads, the transformed coordinates are used as they are, and pulses are distributed on the basis of the transformed coordinates. In this manner, the three-dimensional coordinate transformation is calculated by a reduced number of times, and the burden on the computerized numerical control apparatus for calculations is reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of a three-dimensional coordinate transformation control system according to an embodiment of the present invention; and
FIG. 2 is a block diagram of a hardware arrangement of a computerized numerical control (CNC) apparatus for implementing the principles of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
An embodiment of the present invention will hereinafter be described with reference to the drawings.
FIG. 1 shows in block form a three-dimensional transformation control system according to an embodiment of
REFERENCES:
patent: 4413539 (1983-11-01), Ishizuka et al.
patent: 4979121 (1990-12-01), Inoue et al.
patent: 4981402 (1991-01-01), Krenzer et al.
patent: 5058029 (1991-10-01), Uemura
Fujibayashi Kentaro
Miyake Masahiko
Sasaki Takao
Fanuc Ltd
Ruggiero Joseph
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