Patent ID: 6076446
Filing Date: 2000-06-20
Classification: B26D,B41J,Y10T

Abstract:
A reciprocating mechanism of a sheet material cutting device, comprising:a frame having a first end and a second end, and supporting a fixed blade;a carriage holding a rotary blade movably mounted to the frame, reciprocating between the first end and the second end, the rotary blade contacting the fixed blade as the carriage reciprocates between the first end and the second end of the frame;a driving pulley rotatably mounted at the first end of the frame;a driven pulley rotatably mounted at the second end of the frame;an endless wire stretched between the driving pulley and the driven pulley, the endless wire being connected to the carriage, the endless wire having a node connecting portions of the wire to form an endless loop;a sliding base movable relative to the frame, the sliding base supporting the driven pulley and being pushed by a spring to tension the endless wire; anda driving mechanism in driving engagement with the driving pulley, wherein the driving mechanism drives the driving pulley in one direction to move the endless wire in one direction, wherein the carriage reverses the direction of the movement as the wire is driven in one direction, thus reciprocating back and forth between a distance separating the driven and driving pulleys,wherein carriage includes means for changing the direction of the carriage at the driven and driving pulleys and maintaining the carriage stationary at the driven and driving pulley before the carriage is changing direction,wherein the direction changing means includes a direction turning gear arranged on each of the driving and driven pulleys, a slot formed on the carriage, and a slideable member guided oil the slot, the slideable member engaging the direction turning gear and maintaining the carriage stationary while engaging the direction gear, andwherein the slideable member holds the node of the endless wire, connecting the endless wire to the carrier via the slideable member.