Boots – shoes – and leggings
Patent
1994-04-15
1995-11-21
Envall, Jr., Roy N.
Boots, shoes, and leggings
36447416, 36447422, G05B 19408, G05B 19409
Patent
active
054693527
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an operation history display device of a numerical control apparatus, and more specifically, to an operation history display device of a numerical control apparatus by which the history of I/O signals, operation keys and the like can be simply displayed together with the time thereof.
DESCRIPTION OF THE RELATED ART
Many machine tools each provided with a numerical control apparatus are introduced to manufacturing lines and the like of a factory to enable mass-production of products. Several tens of machine tools each provided with a numerical control apparatus, for example, are disposed in a single manufacturing line in correspondence with each manufacturing process of the products, and thus several tens of numerical control apparatuses are managed by an operator in the same time zone.
Therefore, when an alarm, such as a spindle alarm or the like, is issued by a particular machine tool due to, for example, the break of a tool, the operator first moves to this machine tool. Then, the operator interrupts the machine tool by performing a predetermined operation through the numerical control apparatus provided for the machine tool, removes the alarm indicating the replacement of a tool or the like, and then restarts the machine tool.
When an inexperienced operator performs the operation or when an operator, even if he is an experienced operator, performs the operation in confusion, the operator may perform an inadequate operation. In many cases, this inadequate operation performed by the operator makes a workpiece defective and sometimes damages the machine tool and further an additional alarm may be issued by the machine tools and the like of the following process. Consequently, a problem arises in that a kind of operation performed at a particular time is not recorded and thus it is difficult to specify later a factor by which a fault was caused.
SUMMARY OF THE INVENTION
Taking the above into consideration, an object of the present invention is to provide an operation history display device of a numerical control apparatus which can simply specify a factor by which a fault was caused.
To attain the above object, according to the present invention, there is provided an operation history display device of a numerical control apparatus for displaying the history of I/O signals, operation keys and the like, which comprises a key input means for outputting a key signal of an operation key depressed by an operator to input a command to the numerical control apparatus, a change detection means for detecting a change of a signal such as the key signal and the like and outputting the signal to which the change has been caused, a timer for outputting a present time, an operation history control means for storing the signal name of the signal to which the change has been caused to a history buffer as history data together with the present time, and a display control means for displaying the history data stored in the history buffer on a display unit in response to a predetermined operation performed by the operator.
First, the key input means outputs the key signal of an operation key depressed by the operator to input a command to the numerical control apparatus. The change detection means detects the change of an output signal and outputs a signal to which the change is caused. The operation history control apparatus stores the signal name and the like of the signal to which the change is caused to the history buffer together with a present time output from the timer as history data. Thereafter, the display control means displays the history data stored in the history buffer to the display unit in response to a predetermined operation performed by the operator.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagram showing the entire arrangement of the present invention;
FIG. 2 is a block diagram showing the entire arrangement of a numerical control apparatus;
FIG. 3 is a schematic diagram showing the structure of a ring buffer;
FIG. 4 is a diagram show
REFERENCES:
patent: 5212645 (1993-05-01), Wildes et al.
patent: 5224053 (1993-06-01), Cook
patent: 5297256 (1994-03-01), Wolstenholme et al.
patent: 5323325 (1994-06-01), Izumiya
patent: 5327354 (1994-07-01), Tsujimoto
Isohata Shigeru
Yamazaki Osamu
Yukutomo Masashi
Envall Jr. Roy N.
Fanuc Ltd
Garland Steven R.
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