Boots – shoes – and leggings
Patent
1988-07-11
1990-09-11
Smith, Jerry
Boots, shoes, and leggings
364133, 364134, 364131, 36447423, 36447411, F05B 19403, F06F 922
Patent
active
049567853
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a numerical control (NC) method, which is capable of continuously performing control at high speed in accordance with various kinds of NC programs, without interruption.
DESCRIPTION OF THE RELATED ART
In general, a numerical control apparatus is arranged to read out, block by block, command information stated in an NC program, and to control operations of movable sections of a machine tool, on the basis of data obtained by converting the readout information into an execute form. The conversion to the execute form indicates a conversion where the command information read out from the NC program is converted into data of machine language which is easily processed in the numerical control apparatus.
According to a method where the above-mentioned conversion processing is executed each time command information of a block concerned is read out, i.e., where data reading and conversion processing (preparatory processing) for a block is started after completion of control operation associated with the preceding block, the operation of the movable section of the machine tool can be interrupted until the preparation of the execute form data for the first-mentioned block is completed. On this occasion, in an NC machine tool, for instance, there occur problems such as decreased machining efficiency, flawed workpieces, and vibration.
To obviate these problems, a conventional numerical control apparatus is provided with first and second buffers for storing the data converted into the execute form, and operates to effect parallel processing such that, for instance, while control processing associated with a certain block is carried out on the basis of the execute form data stored in the first buffer, different command information read out from the next block is converted into the execute form and then stored in the second buffer. Further, the control operation based on the data stored in the second buffer is started immediately after the control operation based on the data stored in the first buffer is completed, and at the same time, command information associated with the subsequent block is converted into execute form, to be stored in the first buffer.
The above-mentioned problems can be eliminated to some extent, by converting the command information associated with a certain block into execute form data, while control corresponding to the preceding block is executed, in the aforementioned manner. However, in case short blocks, requiring only a short time period for execution of the associated control operation, are continually stated, the control operation associated with the preceding block can be finished before the preparation of the execute form data for the succeeding block is completed. As a consequence, the operation of the movable section of thhe machine tool can be still interrupted between adjacent ones of these short blocks, resulting in occurrences of problems such as low machining efficiency.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a numerical control method with a parallel processing function, which is capable of completing a preparatory processing for each block of an NC program before a control operation associated with a preceding block is finished, so as to prevent interruption of the control operation, to thereby make it possible to execute, in an uninterrupted manner and at high speed, control which is associated with various kinds of NC programs, including an NC program which contains continuous short blocks each requiring a short execution time.
In order to achieve the above-mentioned object, a numerical control method according to the present invention, comprises the steps of: (a) executing, by the use of a first information processing means, a first partial process of that preparatory processing in which an NC program is read out block by block and command information stated in the thus readout block is converted into an execute form; and (b) executing at least one different partial process which
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Kai Hwang, "Concept of Pipeline Processing", 01.09.80, pp. 377-380.
Fujibayashi Kentaro
Hidaka Yosato
Kawamura Hideaki
Fanuc Ltd.
Smith Jerry
Trammell Jim
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