| 摘要 |
A method of operation of the tape drive, including obtaining the circumferences a supply spool, and a take-up spool, each spool being mounted upon a respective rotatable spool support which is mounted in a housing, the method including rotating the take-up spool support and the supply spool support simultaneously, so as to feed tape from the supply spool into a tape path extending between the spools, and to wind tape on to the take-up spool from the tape path, determining a length of tape fed into the tape path during a measurement period using a sensor assembly, monitoring the angle through which each of the spool supports has rotated during the measurement period, regulating the length of the tape in the tape path, such that the length of the tape in the tape path at the start of the measurement period and the length of the tape in the tape path at the end of the measurement period are substantially the same, and using knowledge of the length of tape fed into the tape path during the measurement period and the angle through which each of the spool supports rotated during the measurement period to obtain the circumferences of the supply spool and the take-up spool. |
