Boots – shoes – and leggings
Patent
1992-05-29
1994-06-28
Smith, Jerry
Boots, shoes, and leggings
36447431, 318573, G05B 1918
Patent
active
053253078
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a synchronized operation system used for controlling a plurality of numerical control apparatuses (CNCs), and more specifically, to a synchronized operation system for CNCs by which a plurality of independently controlled CNCs are made to carry out a synchronized operation.
BACKGROUND ART
Numerical control apparatuses (CNCs) are used at each station of a transfer line for machining parts for automobiles, and these CNCs contain a programmable machine controller (PMC) for controlling only a single axis. The CNCs of this type are referred to as a single-axis CNCs.
Although these single-axis CNCs are usually independently controlled, sometimes a plurality of single-axis CNCs must be simultaneously controlled for performing various operations, i.e., cutting an arc, and to accomplish this, the I/O circuits of the respective CNCs are interconnected and data is exchanged through the I/O circuits.
Nevertheless, when data is exchanged through the I/O circuits, in the operation of the respective CNCs, a time lag occurs and further, communication therebetween becomes complicated, and as a result, a high accurate synchronized operation, such as an interpolation, cannot be carried out.
SUMMARY OF THE INVENTION
Taking the above into consideration, an object of the present invention is to provide a synchronized operation system for CNCs by which an accurate synchronized operation, such as an interpolation, can be carried out among a plurality of CNCs.
To attain the above object, according to the present invention, there is provided a synchronized operation system for CNCs by which a plurality of independently controlled numerical control apparatuses (CNCs) are made to carry out a synchronized operation, the system comprising an external signal generation means for supplying an external timing signal to each of the CNCs, from the outside, an external signal receiving means for receiving the external timing signal, an internal signal generation means for generating an internal timing signal, to operate the CNCs independently, and a basic timing signal selection means for selecting one of the external timing signal received from the external signal receiving means and the internal timing signal received from the internal signal generation means and supplying the selected signal to the CNCs as a basic timing signal.
The external signal generation means supplies an external timing signal to the respective CNCs, from the outside, and the external signal receiving means receives the external timing signal. The internal signal generation means generates an internal timing signal for operating the CNCs independently, and the basic timing signal selection means selects one of the external timing signal received from the external signal generation means and the internal timing signal received from the internal signal generation means, and supplies the selected signal to the CNCs as a basic timing signal.
As a result, after the basic timing selection means has selected the external timing signal, the respective CNCs are operated by using the external timing signal as a basic timing signal. Accordingly, no time lag occurs among the basic timing signals for the respective CNCs, and thus the respective CNCs can be operated while closely synchronized with each other, and can cooperate to carry out even a high accurate synchronized operation, such as an interpolation, based on the basic timing signals.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic diagram showing the arrangement of a synchronized operation system for CNCs according to the present invention; and
FIG. 2 is a diagram showing another embodiment according to the present invention.
DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic diagram showing the arrangement of a synchronized operation system for CNCs according to the present invention, wherein an external ITP signal generation circuit 1 supplies an external
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Fanuc Ltd.
Gordon Paul
Smith Jerry
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