| 摘要 |
An apparatus and associated method for cutting sheet material spread in one or more layers over a supporting surface uses a reciprocating cutting tool cutter movable in two coordinate directions in the plane of the supporting surface to enable the cutting tool to follow a desired line of cut relative to the sheet material. The cutting tool has, at its lower end, a generally downwardly facing sharpened edge, and the stroke of the cutting tool is such that during a portion of each cycle of reciprocation it is located entirely out of the material being cut. During such portion of its cycle of reciprocation it is moved forwardly along the desired line of cut a substantial distance so that during its following downward movement through the material it encounters a substantial length of uncut material which is pressed between the sharpened lower end of the tool and the supporting surface so as to cut the material with a chopping action. The supporting surface is formed by a material which is penetrable by the lower end portion of the cutting tool, and at the lower limit of its reciprocation the lower end of the cutting tool does penetrate the supporting surface to assure cutting of the sheet material through its full vertical thickness.
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