| 摘要 |
<p>PURPOSE:To obtain an intermittent feed motion in excellent stopping accuracy by detecting the rotating digital value of a capstan motor, providing a feedback loop so as to coincide with a command value and reversing the sign of the command value when the feed amt. of a tape-like body exceeds a prescribed value. CONSTITUTION:An intermittent feed motion command (j) is inputted from a motion commander 29 to a computing element 25 to determine a digital command value at first. Then, the timing signal (q) of a rotation detector 23 is also inputted to wait for its change. When it is changed, the new signal (b) of the detector 23 is read out and turned into a rotation detecting digital value. A difference from the digital command value is evaluated and added to a digital value before one timing to obtain a control signal digital value Y, which is then converted by a D/A converter 27 into an analog control signal (c). Each rotation detecting digital value is added to a feed amt. detecting variable to be accumulated, and when it becomes larger than the prescribed value, the sign of the digital command value is reversed, thus completing the intermittent feed motion. A stable and excellent precision intermittently feed reproducing is attained, thus improving the performance for a particular reproducing.</p> |
