| 摘要 |
<p>1409752 Numerical control SPERRY RAND CANADA Ltd 15 Sept 1972 [17 Sept 1971] 42886/72 Heading G3N In a numerical control system, in which data from sources 10 or 12, in the form of data words comprising letters corresponding to a location in core memory 34 in which the word data is to be stored, the data can be called up from the memory in a sequence derived by comparing the letters with a predetermined (alphabetical order) sequence of letters. The data words, see Fig. 3 (not shown) can thus be read in, in any order. The magnetic core memory 34, see Fig. 2 (not shown) comprises addressable sections (56, 58, 60, 62, 64, 66) in which data appertaining to U or X axis tool offset; W or Z tool offset; feedrate and spindle speed overrides and supplemental co-ordinate data can be stored, as well as active and buffer sections (52, 54) The buffer section (54) enables tool control to continue as fresh data is read in, sections (52 and 54) being used to combine incoming data with offset and over-ride data to provide command data. Incoming data words include a buffer bit, which is changed when the word is processed to provide command data, thus ensuring that such data is not reprocessed. The command data may control, as well as positioning, tool change, feedrate, spindle speed and coolant supply. Offset data appertaining to U or X, W or Z contains information defining that one of axes U or X; W or Z resp. to which the offset is to be applied. Position control. The command data has actual position data derived from a member driven resolver subtracted from it in arithmetic unit 28 to derive an error signal applied under control of unit 30 to machine drives via d/a converters. Distance-to-go signals which can be displayed at 50 are updated until all of them are zero corresponding to the completion of a move, whence a hold mode is instituted.</p> |
