Boots – shoes – and leggings
Patent
1985-05-08
1987-08-18
Ruggiero, Joseph
Boots, shoes, and leggings
318571, 318578, G06F 1546, G05B 1918
Patent
active
046881794
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a tracer control system, and more particularly to a tracer control system which is suitable for tracing a concavity of a model.
A tracer control system is well known as a control system which traces the surface of a model with a tracer head and, while doing so, controls the position of a tool such as a cutter or the like in accordance with a displacement signal from the tracer head, thereby cutting a workpiece into the same shape as that of the model.
Conventionally known as methods for tracing a concavity of a model are clamped tracer control systems disclosed in Pat. Applns. Nos. 10228/79 and 145330/81 filed by the present applicant. The clamped tracer control system moves the tip of the tracer head (a stylus) in a predetermined direction while holding (clamping) it at a predetermined depth from the top surface of a model along the inner wall of its concavity (that is, while holding the tip of the tracer head apart from the bottom of the concavity). When the tip of the tracer head moves into contact with the inner wall of the concavity again on the opposite side thereof, it is brought up to the top surface of the model along the inner wall, and then repeats this operation over the entire area of the concavity while effecting a pick feed on the top surface of the model for each stroke while holding the tip of the tracer head at the abovesaid depth (a clamp level) in the concavity. There is thereby formed in the workpiece a concavity of a uniform depth equal to the abovesaid clamp level.
With the above clamped tracer control system, however, each time the clamp level is increased, the already machined upper portion of the inner wall of the workpiece is machined (that is, the cutter is brought into contact with that portion), presenting problems of not only involving a waste of the cutting time but also shortening the service life of the cutter owing to its repeated rubbing against the already machined inner wall of the workpiece.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a tracer control system which reduces waste of the cutting time and wear of the cutter.
The present invention is so arranged as to perform the steps of (a) clamping the tip of the tracer head at a Z-axis position of a predetermined depth in a concavity of the model, (b) effecting contour tracing along the entire circumference of the inner wall of the concavity of the model in the said clamped state and, while doing so, storing the coordinates of maximal and minimal points where the X or Y coordinate of the tip of the tracer head is maximal and minimal on the contour tracing path, (c) feeding the tracer head to a point inside of the nearest one of the maximal and minimal points in the clamped state after completion of the contour tracing, (d) effecting X-Y plane tracing relative to the inner wall of the concavity of the model from the abovesaid point to the minimal point or maximal point on the opposite side of the concavity while retaining the tip of the tracer head in the clamped state, and (e) further lowering the tip of the tracer head along the inner wall of the concavity of the model from the X-Y plane tracing end position and clamping the tip of the tracer head at a new Z-axis position of a predetermined depth, and thereafter repeating the operations (b) to (e) in the newly clamped state until the tip of the tracer head reaches a predetermined depth.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram illustrating an embodiment of the present invention;
FIG. 2 (including Parts A to G) is a series of schematic diagrams showing the configurations of a model and a workpiece and the positional relationships thereof to a stylus and a cutter in the embodiment of the present invention; and
FIGS. 3 and 4 are flowcharts explanatory of its control method.
DESCRIPTION OF PREFERRED EMBODIMENTS
FIG. 1 is a block diagram illustrating an embodiment of the present invention. Reference character MAC indicates a tracing machine, MDL a model,
REFERENCES:
patent: 4355362 (1982-10-01), Imazeki et al.
patent: 4370722 (1983-01-01), Imazeki et al.
patent: 4456864 (1984-06-01), Imazeki et al.
patent: 4535408 (1985-08-01), Kishi et al.
patent: 4599022 (1986-07-01), yamazaki
Fanuc Ltd.
Ruggiero Joseph
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