Boots – shoes – and leggings
Patent
1989-04-17
1991-04-23
Ruggiero, Joseph
Boots, shoes, and leggings
318603, 318615, 3644743, G05B 19407
Patent
active
050104926
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a spindle control system for a numerical control apparatus, and more particularly, to a spindle control system in which a contour control is carried out by a spindle.
2. Description of the Related Art
Contour control by a spindle is conducted while controlling the position of the spindle, to carry out a complicated grooving or machining of a cam, etc., when using a lathe or the like. A prior art system for carrying out the spindle contour control uses a contour control servomotor, and a clutch for connecting the spindle to a spindle amplifier for spindle rotation or to the contour control servomotor.
The prior art system, however, requires a special servomotor for controlling a spindle motor, and a clutch or the like for a changeover between the spindle motor and the servomotor, and thus the entire system has a complicated structure.
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 speed control and position control of a spindle motor are executed at the same time.
To solve the aforementioned problems, according to a first embodiment, there is provided a spindle control system for a numerical control apparatus (CNC), which comprises
a servo control circuit including a microprocessor, a memory, and two counters for counting pulses from encoders, and connected to a CNC bus,
a power amplifier able to receive a command from the servo control circuit and control the rotation of a spindle motor, and
a separate encoder able to feed pulses back to the counter for contour control and coupled to a spindle.
According to a second embodiment, there is provided a numerical control apparatus for controlling a spindle motor and a servomotor, which comprises
a servo control circuit including a microprocessor, a memory, and two counters for counting pulses from encoders, and connected to a CNC bus,
a power amplifier able to receive a command from the servo control circuit and control the rotation of the spindle motor, and
a separate encoder able to feed pulses back to the counter for contour control and coupled to a spindle,
the servo control circuit being adapted to drive the servomotor by changing only the software.
One of the counters of the servo control circuit is used to detect the rotational position of the spindle motor, and the other counter counts the feedback pulses for thread cutting or the like.
Accordingly, the servo control circuit can carry out both the position control and rotation control of the spindle motor, and thus it is unnecessary to provide an extra servomotor for the position control or a clutch for changeover between the servomotor and the spindle motor, and the like, whereby, the contour control by the spindle motor can be carried out with a simplified structure.
Further, since two counters capable of counting the feedback pulses are provided, the servo control circuit can be used to control a servomotor other than the spindle motor, and therefore, the same hardware can be used for controlling both the servomotor and the spindle motor, and thus a numerical control apparatus including a common servo control circuit can be provided.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of a spindle control system according embodiment of the present invention; and
FIG. 2 is a block diagram of an example of a system which controls of a servomotor by a servo control circuit.
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 spindle control system according to the embodiment of the present invention. In the figure, numeral 1 denotes a CNC bus for transmitting a signal from a numerical control apparatus (CNC), not shown; 10 denotes a servo control circuit for controlling the position and speed of a spindle motor, 11 denotes a processor for globally controlling the servo control circuit 10; and 12 d
REFERENCES:
patent: 4237408 (1980-12-01), Frecka
patent: 4386407 (1983-05-01), Hungerford
patent: 4535277 (1985-08-01), Kurakake
patent: 4611155 (1986-09-01), Kurakake
patent: 4622504 (1986-11-01), Yamazaki
Kinoshita Jiro
Kurakake Mitsuo
Fanuc Ltd
Ruggiero Joseph
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