Boots – shoes – and leggings
Patent
1984-11-05
1987-02-24
Smith, Jerry
Boots, shoes, and leggings
364474, 364178, 318636, 318571, 318578, G05B 1918, G05B 2102, G05B 1925, G05B 1933
Patent
active
046462252
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE PRESENT INVENTION
The present invention relates to improvement in tracer control equipment which performs tracer control in response to a displacement signal from a tracer head tracing the surface of a model, and more particularly to tracer control equipment which is capable of preventing a cutter from biting into a workpiece at a point of a sudden change in the configuration of the model such as a corner portion or the like.
In tracing, when a point of sudden change in the configuration of a model, such as a corner or the like, is traced at the same tracing speed as that for other portions, a cutter can bite into a workpiece, which results in lower cutting accuracy. It is a general practice in the prior art to attach a potential wire to a model made of an insulating material in the vicinity of a sudden-change point in the configuration of the model so that when a metallic stylus makes contact with the potential wire, a closed circuit is formed and deceleration control is performed, preventing a reduction of the cutting accuracy at the sudden-change point in the model configuration.
However, the above prior art example has the following defects caused by the necessity of attaching the potential wire to the model.
(1) Since the potential wire has a thickness, the model surface to which the potential wire is attached cannot be traced accurately.
(2) Attaching the potential wire on the model introduces the possibility that the model will be damaged.
(3) Inaccurate deceleration control can result due to bad contact.
Besides this, there has been proposed control equipment of the type in which data representing a deceleration region is prestored in a memory and the deceleration control is performed on the basis of the data and the results of position detection by position sensors in the X-, Y- and Z-axis directions. However, this control equipment calls for prestoring new data indicating the deceleration region in the memory for each of plural models of different configurations, and hence has the defect of involving cumbersome operations.
SUMMARY OF THE INVENTION
The present invention has been made from such a point of view, and has as an object allowing ease in performing the deceleration control at the sudden-change point in the model configuration. According to the present invention, displacement signals from the tracer head and a composite displacement signal are sampled at regular time intervals, the angle between displacement vectors of the stylus at the current and the previous sampling is calculated on the basis of the current and the previous sample value and, on the basis of the result of calculation, control is provided as to whether the feed rate is to be decreased or not.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of an embodiment of the present invention; and
FIG. 2 is a vector diagram showing the direction of displacement of the stylus.
DESCRIPTION OF PREFERRED EMBODIMENTS
FIG. 1 is a block diagram of an embodiment of the present invention, in which 1 is a stylus, 2 a tracer head, 3 a displacement calculation circuit, 4 an indexing circuit, 5 an adder, 6 and 7 velocity component calculation circuits, 8 a distribution circuit, 9 a gate circuit, 10X to 10Z amplifiers, 11X to 11Z motors for moving a workpiece and a model relative to each other in the X-, Y- and Z-axis directions, 12 and 12X to 12Z sampling circuits, 13 and 13X to 13Z delay circuits, 14 and 14X to 14Z multipliers, 15 an adder, 16 a divider, 17 an arithmetic circuit, 18 a comparator and 19 a reference level generator.
The stylus 1 is brought into contact with the model and fed by the motors, and displacement signals .epsilon..sub.x, .epsilon..sub.y and .epsilon..sub.z corresponding to the displacement of the stylus 1 are provided from the tracer head 2. Based on the displacement signals .epsilon..sub.x, .epsilon..sub.y and .epsilon..sub.z, The displacement calculation circuit 3 produces a composite displacement signal .epsilon.=.sqroot..epsilon..sub.x.sup.2 +.epsilon..sub.y.sup.2 +.epsilon..
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Fanuc Ltd
Grossman Jon D.
Smith Jerry
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