초록 ▼

A cutting head for cutting spread sheet material and using a vertically reciprocating knife achieves a light-weight, low cost, low maintenance and high stroking speed design through a unique combination and arrangement of parts wherein the knife drive motor is isolated from rotation with the knife a

A cutting head for cutting spread sheet material and using a vertically reciprocating knife achieves a light-weight, low cost, low maintenance and high stroking speed design through a unique combination and arrangement of parts wherein the knife drive motor is isolated from rotation with the knife about the theta axis without using a conventional swivel mechanism. The knife has a leaf spring portion directly connected to the eccentric member, fatigue failure of the leaf spring portion of the blade is inhibited by antivibration stops and by a varying cross-section, a simple sharpener mechanism sharpens the blade on either one or both side faces, and a roller guide restrains the lower portion of the blade to the vertical axis with minimum frictional loss.

대표청구항 ▼

In a cutter head for use as part of a machine for cutting sheet material, the combination comprising: a base frame vertically movable between a raised position and a lowered position, a knife frame carried by said base frame and rotatable relative to said base frame about a theta axis fixed relative

In a cutter head for use as part of a machine for cutting sheet material, the combination comprising: a base frame vertically movable between a raised position and a lowered position, a knife frame carried by said base frame and rotatable relative to said base frame about a theta axis fixed relative to said base frame, knife guide means carried by said knife frame for supporting a knife for reciprocation relative to said knife frame along an axis parallel to said theta axis and for movement with said knife frame about said theta axis, a knife reciprocating mechanism carried by said knife frame and including an input shaft rotatable about a shaft central axis fixed relative to said knife frame and rotatable about said theta axis with said knife frame when said knife frame is rotated, said knife reciprocating mechanism being operable to reciprocate a knife supported by said knife guide means along said theta axis relative to said knife frame in response to rotation of said input shaft about said shaft central axis, a knife drive motor fixed to said base frame and having a rotatable output shaft, and a drive means drivingly connecting said output shaft of said knife drive motor to said input shaft of said knife reciprocating mechanism while permitting said knife frame and said knife reciprocating mechanism to rotate about said theta axis independently of said knife motor.