Boots – shoes – and leggings
Patent
1985-05-08
1987-07-07
Chin, Gary
Boots, shoes, and leggings
178 18, 364474, G08C 2100, G05B 1546
Patent
active
046791590
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an automatic adjustment method of a tracer head for use in a tracing control system.
Heretofore, initial adjustment of a tracer head for use in a tracing control system has been made manually. That is, zero adjustment of the tracer head, held in a non-contact state or out of contact with the surface of a model, is effected so that the output of each differential amplifier circuit for amplifying the output of a differential transformer may be reduced to zero, after which the tracer head is displaced as predetermined and the gain of the differential amplifier circuit is adjusted so that its output may take a predetermined value at this time.
However, this conventional method has the defects of not only involving long-time, complex adjustment but also dispersion in the cutting accuracy since the results of adjustment vary according to different operators.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an automatic tracer head adjustment method which involves no manual operations, and hence increases the cutting speed and accuracy.
The present invention includes a step of storing the output of each differential amplifier circuit as a zero-point offset amount while maintaining the tracer head in the non-contact state; a step of maintaining the tracer head in a first and a second contact state one after the other, and while doing so, storing first and second coordinates of the tracer head in the first and second contact states one after the other, together with first and second amounts of detection compensated for by the zero-point offset amount; a step of calculating and storing the gain of the differential amplifier circuit on the basis of the first and second coordinates and the first and second amounts of detection compensated for by the zero-point offset amount; and a step of calculating an amount of displacement from an amount of detection obtained by A/D converting a signal available from the tracer head through the use of the stored zero-point offset amount and gain under control of a processor.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram illustrating the arrangement of a tracing control system to which an embodiment of the present invention is applied; and
FIGS. 2 and 3 are flowcharts explanatory of the embodiment of the present invention.
DESCRIPTION OF PREFERRED EMBODIMENTS
FIG. 1 illustrates in block form the arrangement of a tracing control system to which an embodiment of the present invention is applied. Reference character TR indicates a tracer head, ST a stylus, CT a cutter, MAC a tracing machine, MX, MY and MZ servo motors in the X-, Y- and Z-axis directions, respectively, PCX, PCY and PCZ position sensors, CNTX, CNTY and CNTZ reversible counters for counting feedback pulses from respective position sensors to indicate the current position of the tracer head, D/AX, D/AY and D/AZ digital-to-analog converters for converting drive signals for the servo motors from digital to analog form, AMPX, AMPY and AMPZ differential amplifier circuits for differentially amplifying displacement signals from differential transformers of the tracer head, MPX a multiplexer for selectively switching the outputs of the differential amplifier circuits, A/D an analog-to-digital converter for converting the output of the multiplexer from analog to digital form, CPU a processor, MEM a memory comprised of a data memory part M1 and a control program part M2, I/O a data input/output device, KB a keyboard and OPP an operator panel.
The operation of the embodiment of the present invention in FIG. 1 will be described with reference to the flowcharts shown in FIGS. 2 and 3.
The CPU starts its operation at step 1, in which it reads the X-coordinate X of the tracer head at the start of operation from the reversible counter CNTX via a bus BUS and stores it as an X-coordinate XST at the start of operation in the data memory part M1 of the memory MEM. Incidentally, it is the tracing machine MAC that is actually driven b
REFERENCES:
patent: 4055726 (1977-10-01), Turner et al.
patent: 4081603 (1978-03-01), Davis et al.
patent: 4224670 (1981-09-01), Yamazaki et al.
patent: 4296473 (1981-10-01), Imazeki et al.
patent: 4477877 (1984-10-01), Nakamura et al.
patent: 4492818 (1985-01-01), Abe
Yamaguchi Masashi
Yamazaki Etuo
Chin Gary
Fanuc Ltd.
Laibowitz Danielle B.
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