Sequence control system for numerically controlled machine tool

Details Sequence control system for numerically controlled machine tool Sequence control system for numerically controlled machine tool

1980-09-10

1983-01-25

Wise, Edward J.

Boots, shoes, and leggings

364167, 364551, 364200, 371 68, G06F 1300

Patent

active

043707050

ABSTRACT:
A numerically controlled machine tool is equipped with a programmable sequence controller having a first storage area capable of storing operation commands, and a second storage area capable of storing a duplicate of the data planted in the first storage area without erasing the planted data. An operation command, when sent from a numerical control device to the machine tool, is stored in the first storage area and then, when the machine tool has completed the instructed operation, is read out from the first storage area and stored in the second storage area, this operation being repeated as each new command is issued. When electric power is connected to the machine tool, the data stored in the first and second storage areas is compared, an alarm being generated when the two sets of data do not agree.

REFERENCES:
patent: 3283307 (1966-11-01), Vigliante
patent: 3707703 (1972-12-01), Sakai
patent: 3813530 (1974-05-01), Chevalier et al.
patent: 3898621 (1975-08-01), Zelinski et al.
patent: 4118789 (1978-10-01), Casto et al.
patent: 4288849 (1981-09-01), Katsunori

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