PURPOSE: To reduce the revolving load of a rotary head and at the same time to improve the tape touch to the rotary head by increasing the contact quantity between a magnetic tape and a fixed drum constituting a guide drum at the outlet side and decreasing at the input side of the tape to the drum respectively in order to decrease the overlap at the outlet side of the tape.
CONSTITUTION: A magnetic tape 2 is wound around a guide drum 1 at about 270° and at the same time moved down spirally. Thus the height of a tape driving path is changed in the order of A, B, CWH points. Then the tape 2 is wound around the drum 1 at the prescribed 270° with the point B defined as the starting point. The overlap is set at about 7.5° and about 5° at the inlet and outlet sides of the drum 1 respectively. While the contact quantity between the tape 2 and a rotary drum 1a is increased at the inlet side and decreased at the outlet side of the tape 2 to the drum 1. At the same time, the contact quantity between a fixed drum 1b and the tape 2 is decreased and increased at the input and output sides of the tape 2 to the drum 1 respectively. Therefore, the back tension is given to the traveling tape 2.
HIRANO SHINJI
OOHIRA TSUNEHISA
| JPS521291A | 1977-01-07 | |||
| JPS59210556A | 1984-11-29 |
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