| 摘要 |
The motion of a machine tool table is controlled by comparing, for each axis, present location of the machine tool which is represented by the count in a feedback counter, with a desired location, which is represented by the count in a command counter. A transducer produces a pulse train wherein each pulse is representative of increments of machine tool table motion. A reference source of oscillation feeds pulses to drive the command counter. These pulses are modulated by the pulses from the feedback transducer and then are applied to drive the feedback counter. The difference in time at which both counters attain predetermined counts is sensed and is used to generate signals which control the application of drive signals to the motors which drive the machine tool tables.
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