Boots – shoes – and leggings
Patent
1989-01-27
1991-11-12
Fleming, Michael R.
Boots, shoes, and leggings
364DIG2, 364921, 3649395, 36492693, 395500, G05B 1918
Patent
active
050653067
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a machine interface circuit for controlling terminal units such as relays, switches and the like of a machine tool, and more specifically, to an improved machine interface circuit connected to the relays, switches and the like in a simple manner.
BACKGROUND ART
A numerical control unit is usually interfaced with a machine tool through a serial interface in accordance with an increased number of signals.
An example of this is shown in FIG. 3, wherein 1 designates the numerical control unit, and 70 designates an I/O base unit. Usually a plurality of I/O base units are used for a single numerical control unit 1. Two I/O base units 70, 80 are shown in the drawing, and since the I/O base unit 70 and the I/O base unit 80 have substantially the same arrangement, only the I/O base unit 70 will be described. The I/O base unit 70 is connected to the numerical control unit 1 through a serial interface drive unit such as relays and the like by a driver 72a. A serial signal from computer numerical controller (CNC) 1 is converted into a parallel signal by a serial/parallel converter 71. A signal from switches of the machine tool is received by a receiver 73a and the like, converted into a serial signal by the serial/parallel converter 71, and applied to the numerical control unit 1.
The I/O base unit 70 and the like are disadvantageous, in that they include a considerable number of I/O units, long parallel leads must be used to connect the I/O base unit 70 to the relays, the switches and the like of the machine tool and further, problems arise in the manufacture and cost thereof. Although the base unit 70 may be installed in the vicinity of the relays and the like, this causes another problem in that the parallel signal cables to the other switches and the like must be made longer.
SUMMARY OF THE INVENTION
An object of the present invention is to solve the above problems and to provide an improved machine interface circuit which can be connected to relays, switches and the like in a simple manner.
To achieve the above object, in accordance with the present invention, there is provided, as shown in FIG. 1, a machine interface circuit for controlling terminal units such as relays, switches and the like of a machine tool through a numerical control unit (1): comprising through a serial interface; and through serial interfaces, each module including a serial/parallel conversion circuit (30, 50) and drivers (21a) and/or receivers (41a).
Since a serial signal from the numerical control unit is once interchanged by interchange circuits and then transmitted to the vicinity of a group of the relays of the machine tool as the serial signal and there converted into a parallel signal, the distance over which the parallel signal is transmitted shortened, and thus cables, cable bundles, and the like can be provided easily. A signal from the group of the switches is processed in the same manner, but in a reverse direction.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of an embodiment of the present invention;
FIG. 2 is a detailed diagram of a serial/parallel conversion circuit; and
FIG. 3 is a diagram of a conventional interface between a numerical control unit and a machine tool.
DESCRIPTION OF THE PREFERRED EMBODIMENT
An embodiment of the present invention will be hereinafter described in detail with reference to the drawings.
FIG. 1 is a block diagram of the embodiment of the present invention, wherein 1 designates a numerical control unit, and 11 and 12 designate interchange circuits, the numerical control unit 1 being connected to the interchange circuits through a serial interface. The number of interchange circuits 11 and the like is determined in accordance with the overall scale of an NC machine tool.
The interchange circuit 11 is connected to an output module 20 and an input module 40 and the like through serial interfaces. The output module 20 and the input module 40 are installed in the vicinity of a group of relays and a group of switches of the
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patent: 4047003 (1977-09-01), LaRocca et al.
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patent: 4200936 (1980-04-01), Borzcik et al.
patent: 4368511 (1983-01-01), Imazeki
patent: 4628442 (1986-12-01), Isobe et al.
patent: 4628446 (1986-12-01), Hoffner
"Patent Abstracts of Japan", vol. 9, No. 207, Numerical Controller, Aug. 24, 1985.
Imazeki Ryoji
Kurakake Mitsuo
Fanuc Ltd.
Fleming Michael R.
Ray Gopal C.
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