Electricity: motive power systems – Positional servo systems
Patent
1982-03-15
1984-09-25
Dobeck, B.
Electricity: motive power systems
Positional servo systems
307147, 307148, G05B 1101
Patent
active
044737858
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a numerical control unit, and more particularly to a numerial control unit which adopts a packaging method capable of readily dealing with an increase in the number of axes to be controlled.
A standard numerical control unit which performs data processing through the operating function of a processor controls four to five axes at most; this number is sufficient for general use but, in some cases, there is needed a numerical control unit capable of controlling ten-odd axes for some special purposes. A method that is usually considered for constituting the numerical control unit for such many-axis control is to directly connect circuits other than axis-control circuits, such as a tape reader, an NC control panel, etc., to a main bus of a main processor and to connect a required number of axis-control circuits to the main bus. With such an arrangement, however, as the number of parts connected to the main bus is markedly larger than in the case of the standard numerical control unit, the electrical load on the main processor increases and the main bus becomes huge, resulting in such inconvenience that standard circuit parts prepared for the standard numerical control unit, such as a mother board, a storage cabinet and forth, cannot be used. In general, it is advantageous in terms of manufacturing costs and stock control to standardize as many parts as possible; therefore, it is desirable that the numerical control unit for many-axis control could also be constituted using such standard parts. Further, in order for the unit to have a high degree of flexibility, it is also desired that the unit has a construction that allows ease in increasing the number of axes to be controlled.
SUMMARY OF THE INVENTION
The present invention has been initiated in view of the above and has for its object to provide a numerical control unit for many-axis control which can be constructed using parts for the standard numerical control unit and, in addition, permits easily increasing the number of axes to be controlled.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram showing the principal part of an embodiment of the unit of the present invention, and
FIG. 2 is a diagram illustrating an example of packing means for use in the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
For describing the present invention in more detail, its embodiment will hereinafter be described in detail.
FIG. 1 illustrates in block form the principal part of the unit produced in accordance with the present invention. Reference numeral 1 indicates a main processor; 2 designates a main bus; 3 identifies a main memory; 4a to 4c denote buffer circuits; 5a to 5c represent peripheral buses; 6 shows a tape reader control circuit; 7 refers to an NC control panel control circuit; 8 indicates a control circuit for other input-output devices; 9a to 9n and 10a to 10n designate axis-control circuits; 11 and 12 identify cables; and A, B and C denote circuit blocks.
In FIG. 1, the main processor 1 performs arithmatic processing, according to an execution program stored in the main memory 3, on data from the memory 3 or a tape reader and then applies the results of the operation to the axis-control circuits 9a to 9n and 10a to 10n, executing predetermined numerical control. To the main bus 2 is connected a minimum load of the main memory 3 and the buffer circuits 4a to 4c. This is intended to prevent an increase in the electrical load on the main processor 1. The peripheral buses 5a to 5c are respectively provided for the buffer circuits 4a to 4c, and the peripheral buses 5a to 5c are each connected to a desired pieces of peripheral hardware. Incidentally, the buffer circuits 4a to 4c are each constituted, for instance, by a driver circuit and a receiver circuit.
In the unit of the present invention, the peripheral bus 5a has connected thereto circuit portions other than the axis-control circuits, such as, for example, the tape reader control circuit 6, the NC control panel contr
REFERENCES:
patent: 4080759 (1978-03-01), Klar et al.
patent: 4227094 (1980-10-01), Semur
patent: 4337499 (1982-06-01), Cronin et al.
Dobeck B.
Fujitsu Fanuc Limited
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