Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1985-04-02
1986-10-28
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
318590, 364474, G05B 1936
Patent
active
046201424
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a sequence switching system in a tracer control unit with which it is possible to manually change the timing for switching of a tracing sequence by means of a control switch externally provided.
Conventional tracer control units, in general, mechanically set a tracing path, for example, a tracing range in the X-Y plane by means of a limit switch, or by storing the machine position in a memory, and cut a workpiece within the set range while at the same time tracing a model with a stylus of the tracer head. It is difficult, however, to accurately predetermine the tracing range. To get over this problem, a sequence changeover system has heretofore been proposed which has a control switch externally provided for manually changing the switching of a tracing sequence, and which permits, by pressing the control switch, a sequence changeover, for instance, from a tracing operation to a pick feed operation even if the stylus lies within a preset tracing range. According to such a sequence, changeover system, a desired tracing range is first set and then modified in succession during the actual tracing operation.
With the conventional sequence changeover system, however, the sequence changeover is possible only within the preset tracing range but impossible outside it. This inevitably calls for a wide preset tracing range, incurring an increase in the time for tracing.
SUMMARY OF THE INVENTION
The present invention has for its object to enable a manual change of the timing for a sequence changeover by actuation of an externally provided control switch, whether within or without a preset tracing range.
The present invention is directed to a sequence switching system for a tracer control unit which operates according to a tracing direction and a tracing speed based on signals from a tracer head tracing the model surface and performs tracer control, and which is provided with a control switch for inputting a sequence switching signal, a sequence changeover ignore means for ignoring the current sequence changeover during the actuation of the control switch and a sequence changeover execute means for executing a sequence changeover which has been or is to be ignored when the operation of the control switch is released. Accordingly, when continuing the operation of the control switch, even if the stylus goes beyond a preset tracing range, that is, even if a limit switch defining the tracing range is stepped on or the machine position reaches the position stored in a memory that defines the tracing range, no sequence changeover takes place, and at the point of time when the operation of the control switch is released, a sequence changeover is carried out. Therefore, the sequence changeover can be achieved in a region outside the tracing range. Further, by once turning on the control switch within the tracing range and then turning off the switch at a desired position within the tracing range, the sequence changeover which is to be ignored is performed upon turning off of the switch, so that it is also possible to change the timing for a sequence changeover in the region within the tracing range.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram illustrating the principal part of an example of a tracer control unit embodying the sequence switching system of the present invention;
FIG. 2 is a diagram showing an example of tracing operation data;
FIG. 3 is a diagram showing an example of a tracing mode;
FIG. 4 is an explanatory diagram of an example of a tracing path; and
FIG. 5 is a flowchart explanatory of operation.
DESCRIPTION OF PREFERRED EMBODIMENTS
In FIG. 1, a stylus 3 of a tracer head 2 makes contact with a model 1 and is fed by an X-axis servo motor 4, a Y-axis servo motor 5 and a Z-axis servo motor 6. Based on displacement signals .epsilon..sub.x, .epsilon..sub.y and .epsilon..sub.z corresponding to displacement of the stylus 3, a displacement combining circuit 7 outputs a composite displacement signal .epsilon. ##EQU1## and an indexin
REFERENCES:
patent: 4356552 (1982-10-01), Imazeki et al.
patent: 4424570 (1984-01-01), Imazeki et al.
patent: 4456864 (1984-06-01), Imazeki et al.
patent: 4456962 (1984-06-01), Imazeki et al.
Matsuura Hitoshi
Yamazaki Etuo
Dobeck B.
Fanuc Ltd
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