| 摘要 |
<p>988,996. Cutting sheet materials. AVISUN CORPORATION. Sept. 9, 1963 [Oct. 1, 1962], No. 35530/63. Heading B4B. Apparatus for transversely cutting sheet materials 20, comprising a rotor 15, Fig. 2, with a projecting blade disposed along a plane inclined relative to the rotor axis to effect a progressive cut, in co-operation with a bed-knife 29, Fig. 5, having an edge 40, has a fixed structure 31 for movably supporting the bed-knife and means in the form of a pin 43, Fig. 4, pivotally connecting one end of the bed-knife 29 to the fixed structure, and resilience means in the form of springs 45 interposed between the bed-knife 29 and the structure 31 to urge the bed-knife toward the rotor. As described, the rotor includes discs 19 to advance the material and a counterbalancing rib 21 opposite the blade 23, which has a straight cutting-edge 25. A bed-knife assembly 17 includes a supporting bracket 27, the knife 29 and a knife block 31, which is adjustably screwed to a flange 35 of the fixed supporting bracket 27. The aforesaid springs 45 housed in recesses 47 in the block 31 urge the free end of the knife 29 towards the rotor blade 23. Upward movement of the bedknife is limited by an adjustable stop screw 49 threaded into the block 31 in a position to engage with a pin 51 fixed to the knife 29, the pin being movable in a slot 53 in the block as the knife is pivoted, and the knife being urged against the flange 35, Fig. 5, by springs 55 in recesses 57. Before operation, the block 31 is adjusted by screws 59 extending through flanges 61 projecting from the supporting bracket 27. Screws 37 are released and the free end of the bed-knife 29 is depressed by the stop screw, so that the cutting edge 40 is parallel to the axis of the rotor. Screws 59 are then adjusted to position the edge 40 on the surface of revolution of the rotor blade 21, and the screws 37 are tightened to lock the knife block in position. In operation, sheet material 20 is fed over a guide roll 63, between nip rolls 65, 67, and over groups of guide fingers supported between spaced positions of the roll 67. The uppermost edge of the knife block 31 is bevelled at 73 to ensure that the sheet travels along an unobstructed even plane as it moves between the cutters 23, 29, and a rocker plate 75 is oscillated in sequence with the cutting operation so as to release the serrated edge of the sheet material from the cutters.</p> |
