| 摘要 |
A machine for slitting metal sheet has a bridge-type frame provided with upper and lower beams supported on posts. In the space between the two beams are upper and lower powered arbors and also upper and lower storage arbors which align respectively with the upper and lower powered arbors. Each powered arbor supports and turns several knives which are mounted on hubs along those arbors, and these knives when not needed may be moved, along with their hubs, onto the aligned storage arbors. Each knife is captured in a carriage which moves along one of the beams and contains back-up rollers which bear against the knife to prevent its arbor from deflecting under the spreading force exerted by the metal sheet as it is slit. The hubs have a wide stance, and accordingly the knives on them do not acquire a wobble when the hubs are secured on their respective arbors; yet notwithstanding the wide stance, the knives may be brought quite close together. The storage arbors normally support the ends of the powered arbors, but may be withdrawn to remove the knives from the arbors. The knives are positioned through a lead screw which drives a carriage having stops against which knives on the upper and lower arbors are moved. The carriage may also be provided with fingers that actually capture the knives of a pair and move them to the correct position.
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