Boots – shoes – and leggings
Patent
1989-04-17
1991-10-01
Smith, Jerry
Boots, shoes, and leggings
364133, G06F 1546
Patent
active
050539728
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a spindle control system in a numerical control apparatus (CNC). More particularly, the present invention is directed to a spindle control system in which the connection between a numerical control apparatus and a spindle speed control unit is simplified.
Digitized digital spindles are now widely used for spindle motor control units in numerical control apparatuses. FIG. 2 shows a numerical control apparatus system using such a digital spindle.
In FIG. 2, numeral 1 denotes a numerical control apparatus (CNC), which reads out a machining program and delivers movement commands for various axes, a rotation command for a spindle motor, and a machine control signal for a programmable machine controller (PMC), etc., and 2 denotes the PMC which controls an actuator of a machine in accordance with commands from the numerical control apparatus (CNC) 1, and further, controls the starting and stopping of the rotation and the like of the spindle motor. Numeral 3 denotes a spindle speed control unit which has a digital arrangement and controls the speed of the spindle motor in response to a command from the numerical control apparatus (NC) 1, and further, in response to commands from the PMC 2, performs an internal sequence processing such as the rotation and stopping of the spindle motor. Numeral 4 denotes a spindle amplifier which current-amplifies commands from the spindle speed control unit 3 and controls the rotation of the spindle motor 7.
In the arrangement shown in FIG. 2, however, although the spindle speed control unit 3 itself is digitized, the interface with the numerical control apparatus (CNC) 1 is an analog signal. Further, the interface with the PMC 2 is not a bus but a discrete signal from each unit of hardware. Thus the interface of the spindle control unit 3 provides only a small amount of information and requires many cables.
SUMMARY OF THE INVENTION
The object of the present invention is to solve the above problems and provide a spindle control system in which the connection between a numerical control apparatus and a spindle control unit is simplified.
Therefore, according to the present invention, there is provided a spindle control system in a numerical control apparatus (CNC), such that the numerical control apparatus (CNC) and a PMC (programmable machine controller) are connected by a first bus, the numerical control apparatus (CMC) and a spindle speed control unit are connected by a second bus, a command from the numerical control apparatus (CNC) is sent to the spindle speed control unit by the second bus, and a command from the PMC is sent to the spindle speed control unit, via the numerical control apparatus, by the second bus.
The interface of the spindle speed control unit is executed by only the bus connection with the numerical control apparatus, and therefore, a simple arrangement can be provided without the need for special cables or the like.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of a numerical control apparatus system according to one embodiment of the present invention; and
FIG. 2 is a block diagram of a prior art numerical control apparatus system using a digital spindle.
DESCRIPTION OF THE PREFERRED EMBODIMENT
One embodiment of the present invention will now be described with reference to the drawings.
FIG. 1 is a block diagram of a numerical control apparatus system according to the embodiment of the present invention. In FIG. 1, numeral 1 denotes a numerical control apparatus (CNC), which reads out a machining program and delivers movement commands for various axes, a rotation command for a spindle motor, and a machine control signal for a PMC, etc. Numeral 2 denotes the PMC, which controls an actuator of a machine in accordance with commands from the numerical control apparatus (CNC) 1, and further, controls the starting and stopping of the rotation and the like of the spindle motor.
The numerical control apparatus 1 and the PMC 2 are connected by a bus A 8. An auxiliary function comma
REFERENCES:
patent: 4584638 (1986-04-01), Akasofu
patent: 4714999 (1987-12-01), Kiya et al.
patent: 4882670 (1989-11-01), Isobe et al.
Kinoshita Jiro
Kurakake Mitsuo
Fanuc Ltd.
Gordon Paul
Smith Jerry
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