Boots – shoes – and leggings
Patent
1982-05-10
1984-08-21
Ruggiero, Joseph F.
Boots, shoes, and leggings
364168, 364170, 364174, 364520, 318571, 318578, G05B 1936, G06F 1546
Patent
active
044674325
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a tracer control system in which pick feed planes can be made uniform in the case of tracing a hemispherical model.
In the case of tracing a model MDL 1 of a three-dimensional configuration such as shown in FIG. 1, for example, by a system which performs tracer control through calculating a trace velocity and a trace direction based on signals available from a tracer head tracing the model surface, the tracing usually takes place following a route a-b-c-d-e-. That is, the tracer head moves from the position a to the trace return position b in the Y-Z plane, a pick feed is carried out to cause the tracer head to move in the X-axis direction at the trace return position b, thence the tracer head moves to the position c in the X-Z plane, and thence moves from the position c to the trace return position d in the X-Z plane again. In this way, the feed axis is turned through 90.degree. between the pick feed and the tracing operation.
In the case of tracing the model MDL 1 shown in FIG. 1, as described above, the pick feed can be effected in the same plane, only by turning the feed axis through 90.degree.. In the case of tracing a hemispherical model MDL 2 such as shown in FIG. 2, for example, if the abovesaid system is applied, the pick feed cannot be effected in a plane parallel to the X-Y plane as in FIG. 1. The solution of this problem is now being demanded.
SUMMARY OF THE INVENTION
The present invention meets such a demand as mentioned above, and has for its object to effect the pick feed in the same plane in the case of tracing a model with a surface portion that is generally hemispherical.
According to the present invention, the direction of pick feed is determined by a feed direction signal produced on the basis of the result of a decision by a phase decision circuit and the direction of pick feed available from an input unit, and the pick feed performed by a contour trace. Even in the case of tracing a hemispherical model, the pick feed can be effected in a place parallel the X-Y plane.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1 and 2 are explanatory of prior art tracing examples;
FIG. 3 is a block diagram illustrating an embodiment of the present invention; and
FIGS. 4(A) and 4(B) are explanatory of the operation of the embodiment shown in FIG. 3.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 3 is a block diagram illustrating an embodiment of the present invention. Reference character DG indicates a displacement calculation circuit, IND an indexing circuit, ARN and ART velocity arithmetic circuits, DC a distribution circuit, GC a gate circuit, PD a phase decision circuit composed of a switching circuit CC and a zero-cross circuit ZC, SC a sequence controller, IU an input unit, DRX, DRY and DRZ amplifiers, MX, MY and MZ motors, PCX, PCY and PCZ position detectors, ADD an adder, MDL a model, W a work, TR a tracer head, CT a cutter, and ST a stylus.
FIGS. 4(A) and 4(B) show routes in the case of tracing a hemispherical model according to this embodiment, FIG. 4(A) being a front view and 4(B) a top plan view. As will be seen from FIGS. 4(A) and 4(B), according to this embodiment, the tracer head (actually the end of the stylus ST as shown in FIG. 3) moves from the position a to the trace return position b in a plane parallel to the Y-Z plane, the pick feed takes place at the trace return position b, thence the tracer head moves to the position c in a plane parallel to the X-Y plane, and thence moves from the position c to the trace return position d in a plane parallel to the Y-Z plane again, after which the pick feed is again effected in a plane parallel to the X-Y plane. Similarly, the tracing and pick feed portions should occur in planes parallel to the Y-Z and X-Y planes, respectively.
Based on displacement signals .epsilon..sub.X, .epsilon..sub.Y and .epsilon..sub.Z from the tracer head TR, the displacement calculation circuit DG yields a composite displacement signal ##EQU1## which is applied to the adder ADD. The adder ADD
REFERENCES:
patent: 4044289 (1977-08-01), Wenzel et al.
patent: 4224670 (1980-09-01), Yamazaki
patent: 4334272 (1982-06-01), Imazeki et al.
patent: 4370722 (1983-01-01), Imazeki et al.
patent: 4386408 (1983-05-01), Imazeki et al.
patent: 4394608 (1983-07-01), Tryber et al.
Imazeki Ryoji
Yamazaki Etsuo
Fujitsu Fanuc Limited
MacDonald Allen
Ruggiero Joseph F.
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