| 摘要 |
A magnetic tape unit having a machine reel, a file reel, a machine vacuum column, a file vacuum column and a reversible capstan disposed between the vacuum columns. An upper and a lower tape loop position sensor is located in each column. These sensors control the associated reel motor to institute a brake mode of operation therefore when the loop is between the sensors, and to institute a drive mode of operation, to move tape in the same direction as the capstan is moving tape, whenever the loop is in danger of being pulled out of a column or of being buttoned in a column.
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