Patent ID: 7160096
Filing Date: 2007-01-09
Classification: B26D,B26F,B29C,Y10T

Abstract:
1. An apparatus for perforating an advancing plastic film, comprising: a frame; a main shaft mounted in the frame so as to be rotatable through a partial revolution about a central axis of the main shaft; at least one needle roller coupled to the main shaft in radially offset position therefrom by being mounted on a secondary shaft fixedly mounted to the main shaft with a pair of arms, wherein the arms extend radially out from the axis of the main shaft, such that rotation of the main shaft through said partial revolution moves the at least one needle roller through a predetermined arc of motion, the at least one needle roller being arranged to be feely rotatable about an axis of the secondary shaft upon which the at least one needle roller is mounted independently of the rotation of the main shaft; and an actuator coupled with the main shaft and operable to rotate the main shaft through said partial revolution so as to move the at least one needle roller through said arc of motion such that at one end of said arc of motion, the at least one needle roller is in an operative position, adjacent the advancing film, engaging and perforating the film, and at an opposite end of said arc of motion, the at least one needle roller is in an inoperative position, spaced apart from the advancing film.