Boots – shoes – and leggings
Patent
1991-03-18
1994-06-21
Nguyen, Long T.
Boots, shoes, and leggings
36447422, 364188, G06F 1546
Patent
active
053233255
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an operation history display method which permits quick and proper investigation of the causes of troubles in a machine, especially in a machine tool controlled by a numerical control device, and permits trouble-shooting therefor.
BACKGROUND ART
Conventionally known are various machine tools for performing various machining operations, such as cutting, turning, boring, electrical discharge machining, etc. under the control of a numerical control device. In general, the numerically-controlled machine tools of this type has a function to automatically stop the operation of the machine tool and automatically display an alarm message indicative of the kind of trouble when the trouble occurs during the operation. Therefore, the kind of trouble can be quickly specified. The operation of the machine tool, however, involves transfer of various control information signals, including various commands delivered from the numerical control device, various feedback signals delivered from sensor systems of the machine tool, and various commands and data manually inputted through a control panel, so that it is difficult to grasp the progress of the operation before the occurrence of the trouble with speed and accuracy. Accordingly, the investigation of all the causes of troubles requires labor except those ones, such as machining program errors, which can be specified relatively easily. In order to restart the operation of the machine tool in the same operating conditions as when trouble is caused, moreover, the operating conditions at the time of occurrence of the trouble must be ascertained. However, if an operator operates a reset button by mistake, for example, the operating conditions will be initialized. It is difficult, therefore, to grasp the operating conditions at the time of occurrence of the trouble in accordance with the contents of a machining program only. This constitutes a hindrance to the restart of the operation.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a method of displaying an operation history of a machine, which permits quick and proper investigation of the causes of troubles and trouble-shooting therefor.
In order to achieve the above object, a method of displaying an operation history of a machine according to the present invention comprises the steps of: (a) successively storing, in a plurality of address regions of a memory, block informations individually indicative of a plurality of up-to-date blocks in a machining program composed of a series of blocks to be read block by block; (b) successively discriminating those circuit sections of an input/output circuit concerned individually in the transfer of control information between the machine and a control unit during the execution of each block; (c) successively writing code informations, individually indicative of the circuit sections judged to have been concerned in the control information transfer, in the memory address regions corresponding to the block in execution at the point of time of the judgment; and (d) displaying the storage contents of the memory in accordance with a display command.
According to the present invention, as described above, the block informations indicative of the blocks in the machining program and the code informations indicative of the circuit sections concerned in the control information transfer are successively written in the memory to update the storage contents of the memory, so that the up-to-date operation history of the machine tool can be recorded. Since the operation history is read out as required from the memory, moreover, an operator can analyze the displayed operation history to investigate the causes of troubles and the like in detail. In an electrical discharge machining apparatus or the like, moreover, interrupted machining can be restarted in the same or like conditions as when the machining is interrupted.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic block diagram showing a numerical contr
REFERENCES:
patent: 4251858 (1981-02-01), Cambigue et al.
patent: 4479197 (1984-10-01), Haas
patent: 4672574 (1987-06-01), Baird et al.
Tool and Manufacturing Engineers Handbook, Daniel B. Dallas, Third Ed., pp. 12-117-12-123, 1976.
Numerical Control, R. M. Dyke, Prentice-Hall, Ch. 11, pp. 119-137, 1967.
Fanuc Ltd.
Nguyen Long T.
Trammall Jim
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