| 摘要 |
<p>PURPOSE:To provide a drum assembly uniformizing the thickness of an air film in all area where a tape winds on the drum assembly taking mass- productivity into consideration. CONSTITUTION:A rotary drum 20 is located on a fixed drum 10. The rotary drum 20 and the fixed drum 10 is arranged coaxially. A fixed drum 10 is formed so that the clearance between rotary drum 20 and the fixed drum 10 is decreased gradually from the tape input side A to the tape output side C of the fixed drum 10.</p> |
