| 摘要 |
Upper and lower combined cutting and anvil rolls are provided with axially-extending circumferentially-spaced grooves for receiving compression cutting blades clamped therein, with their cutting edges substantially engaging the anvil portions of the other roll. One roll is drivingly connected to the other roll by intermeshing helical gears whereby one roll can be shifted axially and thereby simultaneously shifted circumferentially relatively to the other roll in order to vary the circumferential spacing of the cutting blades of the upper and lower rolls so as to vary the lengths of the sheets cut from a web of paper emerging from a printing press by which the pages have been printed. An adjusting screw shaft engages the upper roll through a thrust bearing and is equipped with a hand wheel and lock nut wheel to shift the roll axially and lock it in position. Registering concentric annular dials between the upper axially-adjustable roll and its helical drive gear indicate the adjustment which may be obtained. A cam device on the lower roll registers with ejector bars adjacent the cutting blades to eject the trim or scrap left over when the lengths of the pages cut total less than the circumference of the roll. On both the upper and lower rolls are mounted compression cutting blades, each roll acting not only as a cutting roll but also as a rotary anvil roll for the cutting blades of the other cutting roll.
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