| 摘要 |
1508933 Cutting-out apparatus F L SMITHE MACHINE CO Inc 9 June 1976 [25 June 1975] 23941/76 Heading B4B A rotary cutting apparatus for cutting-out openings 30 in a web 26, e.g. in making envelope blanks, comprises a cutter die 28 having a continuous upstanding knife blade 46 formed with side edge portions 48, 50 and leading and trailing edge portions 52, 54 which extend at oblique angles to the side edge portions. The cutting die co-operates with a rotary anvil 14; alternatively, the die may co-operate with a stationary bar. |
