| 摘要 |
In an apparatus for removing the side portions from a rapidly moving web such as by threading the web through a pair of rotary slitting knives that have their cutting edges spaced apart a distance corresponding to the width of the desired web, there is provided a pair of piercing knives located upstream of the slitting knives for setting-up the rapidly moving web for initial entry into the slitting knives. The piercing-knives are supported on vertically reciprocable piston rods for plunging the piercing knives into the rapidly moving web at points inward of where the web is to be slit and on horizontally reciprocable piston rods for advancing the piercing knives outwardly through the side edges of the web to form transverse cuts therein. The piercing knives are pivotably mounted so that they may rotate during their outward movement to enable their cutting edges to be utilized in cutting through the side edges.
|
