| 摘要 |
The present invention is an improved rotary cutting device for continuously cutting a web of material, such as paper, cardboard, plastic sheet, steel sheet, aluminum foil, etc. In particular, the present invention relates to a rotary cutter assembly for continuously cutting a web of material to predetermined lengths with cut lines that are essentially perpendicular to the feed direction of the web. A knife rotor is provided with its axis of rotation being perpendicular to the feed direction of the web to be cut. A straight knife is embedded in a straight slot on the knife rotor with a straight blade protruding radially from the surface of the rotor. The blade is positioned at an angle to the axis of rotation of the knife rotor. A stationary round bar is provided next to the knife rotor and cooperates with the knife rotor to cut the web passed therebetween. The stationary round bar is also angled relative to the longitudinal axis of the knife rotor, but in the opposite direction relative to the blade, so that an arc subscribed by any given point of the blade throughout the length of the blade is tangent to the external circumferential surface of the stationary round bar. During operation, a shear cut can be made to the continuous web passed between the knife rotor and the stationary round bar, producing a straight cut line perpendicular to the feed direction of the web.
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