HEAD DRUM AND SWITCHING DEVICE WITH TWO TAPE GUIDE

摘要

The circumference length of a lower drum (1) is divided by two lead lines (2,3) for standardizing the 4mm of DAT head drum. The switching apparatus rotates the head drum as much as certain deg. to select the necessary lead line. The one of lead line (2) is formed on the lower drum (1) with a track angle that a 1 to wind the tape greater than 180 deg. including the overlapping. Another lead line (3) is formed on the opposite side of the former one with track angle theta 2 to wind the tape greater than 90 deg..