| 摘要 |
In a high speed magnetic tape duplicating system, a single master tape (21) is wound around a transfer drum (7) rotatable about a fixed axis. Longitudinal sections of two copy tapes (31A and 31B) are preferably urged against different sections of the master tape (21) as it contacts the transfer drum (7) using an air clamp, and bias field magnetic transfer heads (6A and 6B) are used to carry out anhysteretic transfer from the master to the copy tapes. The transfer heads (6A and 6B), mounted on translatable deck plates (5A and 5B), may be retracted away from the transfer drum (7) along with the master and copy tapes to facilitate threading, rewinding, and automatic transfer drum cleaning with a plurality of rollers. The method of the invention includes steps whereby the master tape may be automatically threaded to accommodate both shuttle and bin-loop modes of operation and to detect damage to the master tape and halt further duplicating. |
