| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a sheet roll without a core with a high degree of inner diameter accuracy without an increase in cost. SOLUTION: On the inner peripheral surface of an outer shaft 42, ring-like step parts 57, 58 are formed on both end sides in the axial direction. In the step parts 57, 58, roller grooves 59-62 forming tracks of rollers 46-53 are formed along the axial direction of the outer shaft 42 with equal intervals in the circumferential direction. The roller grooves 59-62 include a large diameter part deep in groove depth and relatively large in the inner diameter of the outer shaft 42, a small diameter part shallow in the groove depth and relatively small in the inner diameter of the outer shaft 42, and an inclined part connecting them. When the rollers 46-53 are positioned at the large diameter part, the outer diameter of the outer shaft 42 is D1. When the rollers 46-53 positioned at the large diameter part is made to run on the small diameter part, the small diameter part is pressed by the rollers 46-53, and the outer diameter of the outer shaft is expanded to D2. When the rollers 46-53 positioned at the small diameter part are returned to the large diameter part, pressing by the rollers 46-53 is released, and the outer diameter of the outer shaft 42 is contracted to the original D1. COPYRIGHT: (C)2011,JPO&INPIT
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