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A cutter in which a reciprocating knife is driven by an eccentric mechanism. The knife has a drive portion that flexes laterally in a plane perpendicular to the drive axis of the eccentric mechanism. The eccentric drive axis is offset along the perpendicular plane away from the axis on which the kni

A cutter in which a reciprocating knife is driven by an eccentric mechanism. The knife has a drive portion that flexes laterally in a plane perpendicular to the drive axis of the eccentric mechanism. The eccentric drive axis is offset along the perpendicular plane away from the axis on which the knife reciprocates. The offset of the eccentric drive axis allows the flexible drive portion to be kept straighter during the downstroke than in previous cutters. The increased straightening provides greater columnar strength and reduces deflection and stress of the drive portion during the time the knife is in compression. During the upstroke the knife is bent to a greater degree than in the previous cutters, but during this time the knife is in tension, the tension forces opposing rather than aiding the bending. The offset therefore provides for a longer service life for a blade of equal size or allows a reduction in size and mass of the knife to maintain an equivalent service life.

대표청구항 ▼

A reciprocating knife cutter comprising; an elongated knife having a lower part with a sharpened edge extending along at least a portion of the length thereof, a frame, means carried by said frame engaging said lower knife portion and restraining it to reciprocating movement along a straight vertica

A reciprocating knife cutter comprising; an elongated knife having a lower part with a sharpened edge extending along at least a portion of the length thereof, a frame, means carried by said frame engaging said lower knife portion and restraining it to reciprocating movement along a straight vertical axis of reciprocation fixed relative to said frame, an eccentric drive member supported on said frame for driving rotation about a horizontal drive axis fixed relative to said frame, and an elongated drive portion connected with said lower portion of said knife and extending upwardly therefrom and having an upper end connected with said eccentric drive member for rotation relative to said eccentric drive member about a horizontal eccentric axis fixed relative to said drive member and spaced from and parallel to said drive axis, said drive portion being laterally flexible in a plane perpendicular to said eccentric axis so that as said eccentric member rotates about said drive axis said drive portion reciprocates said lower portion of said knife along said axis of reciprocation and flexes laterally to accommodate the horizontal component of motion of said eccentric axis, said drive axis of said eccentric drive member being spaced horizontally in a plane perpendicular to said eccentric axis a substantial distance from said reciprocation axis so that the deflection of said drive portion during its downstroke is different from its deflection during its upstroke.