Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Patent
1985-10-07
1986-12-30
Dobeck, B.
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
250552, G05B 106
Patent
active
046331557
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a numerical control system for controlling various machines such as wire-cut electrospark machine, turret punch press, composite machine tool and so forth and, more particularly, to a numerical control system in which various functions are coupled by means of optical fibers.
Most current numerical control systems (referred to as "NC system", hereinafter) incorporate computers. More specifically, these NC systems have the following constituent elements: a processing device such as a microprocessor adapted to perform various processings such as numerical control processing, edit processing, transmission and receiving of data and so forth, in accordance with a control program and a machining program; memories such as a nonvolatile data memory, a working memory and a control program memory; a paper tape reader and a paper tape puncher; a control panel incorporating a display device; an external storage medium such as cassette type magnetic tape; and a heavy current circuit for signal exchange between the controller and the machine, e.g. delivery of signals, such as a miscellaneous function command or a spindle rotation command, to the machine and delivery of work completion signals to the controller upon confirming the completion of the work in response to the miscellaneous function command or the spindle rotation command. The NC system further includes servomotor units having driving motors for positioning the spindle in the directions of X,Y and Z axes, and a pulse distributor for distributing pulses to these servo units.
In these known NC systems, the exchange of data between different functional blocks (for example, paper tape reader and microprocessor) in the system is made through a data bus, while the delivery of the address is made through an address bus. As a matter of fact, in order to concurrently send signals comprising n bits constituting each unit of data, each data bus includes n lines, so that the connection of bus lines between associated functional blocks is very complicated. In addition, since the NC systems are usually used in factories or the like where there is a lot of electrical noise, the address bus often and the data bus tend to pick up the electrical noise resulting in a malfunction of the NC system. Another problem of the prior art is that a specific consideration or measure is required to standarize the interface between associated functional blocks which raises the cost of the NC system.
SUMMARY OF THE INVENTION
In order to obviate these problems of the prior art, according to the invention, there is provided a numerical control system in which the data processing section is connected to various functional blocks by means of buses comprising optical fibers, and the data is transmitted in the form of serial light signals through these data buses comprising the optical fibers. More specifically, each functional block is provided with a shift register for converting parallel signals into serial signals, a transmitter converting the output signal from the shift register into a light signal and to transmitting the light signal to the optical bus through a photo branching device, a receiver for converting the light signal coming from the photo branching device into an electric signal, and a shift register for converting the serial output from the receiver into a parallel signal. Thus, according to the invention, the data processing section and each functional block are connected by a data bus comprising an optical fiber cable and the exchange of the data between the data processing section and each functional block is made through this data bus comprising by the optical fiber.
Thus, the present invention provides a compact NC system which can perfectly eliminate the pick up of electrical noise by the bus lines.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a circuit block diagram of a conventional NC system;
FIG. 2 is a circuit block diagram of an NC system constructed in accordance with an embodiment of the invention;
F
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Komiya Hidetsugu
Kurakake Mitsuo
Dobeck B.
Fanuc Ltd.
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