| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent the damage of a magnetic tape which is generated at the outer circumferential edge part of a tape lead plane by forming a chamfered surface such as slope, roundness and so forth at the outer circumferential part of the tape lead plane guiding the edge of one side of a magnetic tape in a helical state. SOLUTION: A slope 8 or a roundness or a chamfered surface similar to them is formed at outer circumferential edge part 7a of the tape lead plane 7 of a fixed drum 5 by cutting the edge part 7a with a chamfering work. At the time of loading and unloading a magnetic tape 12, when the tape slides up upon the tape lead plane 7 from the direction of the arrow a1 against a downward slide energizing force F or the tape slides down below the plane 7 to the direction of the arrow b1 by a downward slide energizing force F, the magnetic tape 12 can be smoothly guided in directions of the arrows a1, b1 by the chamfered worked surface 10 such as slope 8, roundness and so forth.</p> |
