Boots – shoes – and leggings
Patent
1985-05-31
1987-12-22
Fleming, Michael R.
Boots, shoes, and leggings
364475, 364167, G06F 1546, G05B 1918
Patent
active
047149990
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a numerical control method and, more particularly, to a numerical control method wherein operation is simple at resumption of machining.
2. Description of the Related Art
If, during the machining of a workpiece by a machine tool controlled by a numerical control unit, a tool should break or a power failure occur and result in suspension of the machining operation, the conventional practice is to take the following countermeasures and then resume machining: starting point. For example, the starting point is set in a digital switch or stored in a non-volatile memory. restore a table or tool to the machine origin. the table or tool at the machining starting point by using machining starting point information stored in the non-volatile memory or set on the digital switch. operator returns numerical control command data to the beginning. from the beginning of the numerical control command data to the position at which machining was suspended. At this time, M-, S- and T-function instructions are not delivered to a programmable controller unit (PC) and these functions are not performed on the PC or machine side. T-function data that prevailed at the suspension of machining, which data are displayed on a display of the numerical control unit, manually sets the observed data in the PC and resumes machining.
Thus, at the resumption of machining, the conventional numerical control unit is caused to search the program from the beginning of the numerical control command data to the position at which machining was suspended. In doing so, however, the numerical control unit does not perform a distribution operation. Since arithmetic functions are suspended on the PC side, the PC does not have knowledge concerning the M-, S- and T-function data that prevailed at suspension of machining. Consequently, when the program arrives at the state for resumption of machining, the states of the M-, S- and T-functions are displayed on the display unit and these are set in the PC while being verified visually by the operator. Thus, in resuming machining, operator intervention is a necessity in the prior art. This not only results in a troublesome machining restart operation, but is also inconvenient in that unexpected accidents occur when the operator mistakes the states of the M-, S- and T-functions and erroneously enters them in the PC.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a numerical control method whereby, when machining is suspended and then resumed, execution is restarted from any block of a machining program and machining is continued under conditions exactly the same as those that prevailed when the program was run from the beginning, this being accomplished in a short period of time and without requiring much skill.
Another object of the present invention is to provide a numerical control method whereby machining is capable of being resumed without manually inputting the states of M-, S- and T-functions in a PC.
According to the present invention, there is provided a numerical control method for a numerical control system including a numerical control unit for executing numerical control of a machine on the basis of a machining program and a programmable controller unit for executing sequence control of a machine on the basis of a control signal from the numerical control unit. The method has a first step of returning the machining program to the beginning when automatic operation of the numerical control unit is suspended and a second step of running the machining program up to a prescribed position necessary for resuming machining, this being executed by the numerical control unit after the first step. A third step is included and involves operating the programmable controller unit based on data transmitted by the numerical control unit without the programmable controller unit outputting signals to the machine side, this being executed when the second step is executed. A fourth step is also included and i
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Kiya Nobuyuki
Yoshino Motoaki
Fanuc Ltd.
Fleming Michael R.
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