| 摘要 |
<p>PURPOSE:To execute the economical control by controlling the degree of vacuum based upon the tape suction position. CONSTITUTION:A magnetic tape 8 remains stationary at the position where the force sucked to vacuum parts 4 and 5 and the torque of the reel are balanced. Here, when the degree of vacuum comes to be large, the magnetic tape 8 is stationary at the position where the tape is pulled out to the inside of the vacuum parts 4 and 5, as shown by the dotted line. At such a time, since the displacement quantity of the magnetic tape 8 is determined corresponding to the changing quantity of the degree of vacuum, when the vacuum pump not shown in the figure is controlled so that the displacement quantity can be zero, the tension of the magnetic tape 8 is kept at the constant value. Thus, the high-priced air pressure sensor comes to be unnecessary and the economical efficiency is improved.</p> |
