| 摘要 |
<p>A leg-surrounding opening forming apparatus (100) according to the present invention includes: a cutter roller (110) having an outer circumferential surface provided with blades (112) to cut predetermined regions (44) corresponding to L-size openings (40L) in a web (7), and configured to rotate at a fixed speed when a leg-surrounding openings (40) of a single size are formed; an anvil roller (120) facing the cutter roller (110) across the web (7); and a controller unit (130) configured to control a cutter circumferential speed (c). The controller unit (130) is configured to control the cutter circumferential speed (c) in such a manner as to equalize the cutter circumferential speed (c) to a conveyance speed (v) of the web (7) when the L-size openings (40L) are formed, and to make the cutter circumferential speed (c) higher than the conveyance speed (v) of the web (7) when M-size openings (40M) are formed.</p> |
