| 摘要 |
<p>PURPOSE:To control the tape speed to a constant value with high accuracy and simple circuit by controlling the turning of a winding reel so that separate specific conditional Equations are established respectively at the first half and the latter half of the tape length. CONSTITUTION:While the first half of a tape 1 is wound, a switch 16 is thrown to the position of a contact S, and an addition output voltage VT+0.68VS from an adder 14 is fed to an adder 17. A voltage -1.2VA is fed to the adder 17 from a reference voltage generator 18 and then a summing output of Vr+0.68VS -1.2VA is obtained from the adder 17. The summing output is fed to a drive circuit 20 via a low pass filter 19 and the control based on a straight line (b) is conducted. When the 1st half of the tape 1 is wounded up, the switch 16 is thrown to the position of contact T. An addition output voltage VS+0.68VT from an adder 15 is fed to the adder 17. The summing output of VS+0.68VT -1.2VA obtained from the adder 17 is fed to the drive circuit 20 via a low pass filter 18 and the control based on a straight line (c) is conducted. The tape 1 is run at a prescribed speed in this way.</p> |
