Boots – shoes – and leggings
Patent
1985-11-18
1988-12-27
Smith, Jerry
Boots, shoes, and leggings
364200, G05B 19403
Patent
active
047945419
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a numerical control method for numerically controlling a machine tool or the like and, more particularly, to a numerical control method adapted for automatic loading of a numerical control (NC) program.
DESCRIPTION OF THE RELATED ART
FIG. 4 is a block diagram illustrating the essentials of a numerical control system. A conventional control system will now be described based on this drawing. An NC machine is controlled by an NC unit. The NC unit selects the required NC program from among a plurality of NC programs read into an internal memory of the NC unit from an external memory device such as a bubble cassette, NC tape or host computer, and the NC unit controls the operation of the NC machine while reading this program out of the internal memory. The drive of the NC machine is equipped with a drive section of a table, tool rest and the like, and with a control section for controlling spindle rotation on/off and the like, relay operation and sequence operation. The NC unit performs automatic monitoring and adaptive control of the NC machine. Specifically, status information such as workpiece dimensions and tool wear is fed back from the NC machine and appropriate control is carried out based on the feedback information.
When it is attempted to execute, e.g., a series of NC programs in such a numerical control system, conventionally the first step is for the operator to designate the number of a program. When this is done, the NC unit performs a search to determine whether or not the designated NC program is present in the internal memory. If the number does not exist, the NC unit causes an error to be displayed. Thus, the conventional control method is disadvantageous in that when a desired NC program does not exist in the internal memory of the NC unit, an alarm (error display) is generated and the operator must take measures to manually store the desired NC program in the internal memory. In other words, irrespective of the fact that the NC unit has an internal memory and a bubble cassette, paper tape reader or host computer is provided as external memory means, a problem encountered is that a method of having these units cooperate with and back up the internal memory is inadequate. There is also a need to expand the function of the internal memory.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a numerical control method in order to solve the foregoing problems, which method seeks to achieve cooperation between an internal memory of an NC unit and external memory means and to expand the function of the internal memory.
According to the present invention, there is provided a numerical control method of a numerical control unit having an internal memory for storing an NC program and external memory means, the numerical control unit executing an NC program in the internal memory designated by a program selection signal from external selection means. The numerical control method includes automatically searching the internal memory for an NC program designated by the program selection signal, automatically accessing the external memory means in a case where the designated NC program does not exist in the internal memory and, in that case where the designated NC program exists in the external memory means, automatically deleting the NC program in the internal memory, automatically reading the designated NC program into the internal memory, and executing the NC program.
By providing the present invention, a desired NC program can be executed even if the NC program does not exist in the internal memory of the numerical control unit, this being accomplished by automatically accessing the external memory means and reading the desired NC program, which is stored in the external memory means, into the internal memory. Accordingly, the operator need not perform a troublesome operation, economy is improved by reducing labor costs and production efficiency is raised by automation. Further, according to the present invention, even thoug
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Fanuc Ltd.
MacDonald Allen
Smith Jerry
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