Communications: electrical – Continuously variable indicating – With meter reading
Patent
1991-07-15
1993-09-21
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
34082569, 341173, 364136, 377 44, H04Q 100
Patent
active
052472957
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a pulse transfer system for a manual pulse generator, and more specifically, to a pulse transfer system for a manual pulse generator by which the reliability of wireless data communication is greatly improved.
2. Background Art
Since a manual pulse generator for a numerical control apparatus is connected to the main body thereof, a cable having a plurality of circuits is needed, and further, the cable must be moved as the operator operating the manual pulse generator moves. Namely, since the cable must be moved, the operation efficiency is greatly lowered.
To solve the above problem, the inventor proposed a wireless manual pulse generator in Japanese Patent Application No. Hei 1-286737.
In this application, a numerical control apparatus monitors an output pulse signal transferred by a manual pulse generator unit, at all times, and notifies the manual pulse generator unit of the receiving state thereof. More specifically, when the output pulse signal is normally received, a normal reception signal is returned to the manual pulse generator unit, and when the signal is not received, a not received signal is returned thereto. When the numerical control apparatus cannot confirm that transferred data has been normally received, the manual pulse generator unit retransfers the data, and when the number of times that the transferring/receiving data is not received exceeds a predetermined limit, the transferring/receiving of the data is interrupted.
With this arrangement, the transfer/receiving state of data is strictly checked, to thereby improve the reliability of the transferring/receiving of data.
Nevertheless, in the conventional pulse transfer system for the manual pulse generator, since the emphasis is placed on a confirmation of whether data is correctly transferred from the manual pulse generator unit and correctly received by the numerical control apparatus, the transfer/receiving system becomes complex and the handling thereof is time-consuming.
SUMMARY OF THE INVENTION
Taking the above into consideration, an object of the present invention is to provide a simple wireless type pulse transfer system for a manual pulse generator unit by which the same reliability as that obtained when a conventional cable is used, is ensured.
To solve the above problem, according to the present invention, there is provided a pulse transfer system for a manual pulse generator by which a pulse signal output from a manual pulse generator unit is transferred to a numerical control apparatus through a wireless channel, which comprises a counter disposed in the manual pulse generator unit for counting pulses generated in accordance with the rotation of the manual pulse generator from a reference time, a signal transfer means for transferring a numerical value of the counter to the numerical control apparatus as a coded signal, at each predetermined time, through the wireless channel, and a signal receiving means disposed in the numerical control apparatus for receiving the coded signal through the wireless channel and counting the pulses of the manual pulse generator.
The coded signal transferred from the manual pulse generator unit through the wireless channel is a signal of an absolute position using a time as a reference, and a present position as the absolute position is transmitted as data to the numerical control apparatus at each predetermined time. The numerical control apparatus takes out data of the present position as the absolute position from an output pulse signal transferred from the manual pulse generator unit through the wireless channel.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of the hardware of a manual pulse generator unit embodying the present invention;
FIG. 2 is a block diagram of the hardware of a numerical control apparatus unit embodying the present invention;
FIG. 3 is a diagram explaining the content of an output pulse signal transferred from a manual pulse generator unit in the present invention;
REFERENCES:
patent: 4004137 (1977-01-01), Schroder
patent: 4519026 (1985-05-01), Nozawa et al.
patent: 4628442 (1986-12-01), Isobe et al.
Fanuc Ltd.
Yusko Donald J.
Zimmerman Brian
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