Boots – shoes – and leggings
Patent
1984-01-20
1986-05-13
Wise, Edward J.
Boots, shoes, and leggings
364167, G06F 700, G06F 1300
Patent
active
045890919
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Priority benefit is claimed for this application based on application Ser. No. PCT/00149, filed on Oct. 3, 1980, based on Japanese Application No. 90562/79, filed June 30, 1979.
This invention relates to a numerical control device having both a magnetic bubble memory and an integrated circuit memory (hereinafter IC memory) as memories for storing machining program data, and more particularly to a numerical control device capable of high-speed numerical control processing wherein machining program data is transferred to and stored in a high-speed IC memory from a non-volatile, large-capacity magnetic bubble memory by introducing power from a power source.
A numerical control device of the stored program type executes a numerical control process in accordance with a control program and machining program data which are stored in a memory in advance. Until recently, core memories have been used to store the machining program data in such numerical control devices, but there is now a growing trend toward the use of magnetic bubble memories for this purpose. The reason is that it is possible to provide a less expensive numerical control device since the magnetic bubble memory allows a large functional packing density to be achieved and is therefore less costly than a core memory, though both types of memory are similar in that they are non-volatile and large in capacity.
While the magnetic bubble memory is advantageous in that it is inexpensive and capable of retaining its memory in the event of an interruption in power, a read/write operation is performed in page units (10 to 20 bytes), and a disadvantageously long access time of several miliseconds per page is required. Hence, when a processor accesses the magnetic bubble memory directly in an effort to execute a numerical control process, program execution time is prolonged so that it becomes impossible to realize high-speed numerical control processing.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an inexpensive numerical control device which allows high-speed numerical control processing even if a magnetic bubble memory is employed as the memory means.
In accordance with the present invention, a non-volatile, large-capacity magnetic bubble memory and a high-speed IC memory are provided as the memories for machining program data and for other forms of data, as well as an interface circuit for administering the transfer of data between these two memories. Machining program data and other machining data that has been stored in the magnetic bubble memory is transferred through the interface circuit and stored in the IC memory by connecting the numerical control device power source to the circuitry, the numerical control process being executed by accessing the IC memory. Thus, the processor which is built in the numerical control device need only access the high-speed IC memory in the processing of numerical control, allowing such processing to be performed at a high speed. The overall cost of the system can be reduced even though the magnetic bubble memory is combined with the integrated circuit memory, since such combination is still much lower in cost than the core memory. Furthermore, since the machining program data and other machining data stored in the magnetic bubble memory are not destroyed in the event of an interruption in power or a power failure, the numerical control processing can be resumed following the reintroduction of power merely by repeating initial loading. This greatly simplifies the task of the operator.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram showing the principal portions of a numerical control device in accordance with the present invention, and
FIG. 2 is a block diagram showing the principal portions of another embodiment in accordance with the present invention.
FIG. 3 is flow chart of a prior art program capable of providing the function of an initial program loader.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Reference will now be ha
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System Utilizing Low Cost Control Store Backing Memory; R. P. Fletcher, IBM Technical Disclosure Bulletin, vol. 20, No. 10, Mar. 1978, pp. 4226-4229.
Imazeki Ryoji
Kurakake Mitsuo
Fanuc Ltd.
Wise Edward J.
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