Patent ID: 7152388
Filing Date: 2006-12-26
Classification: B65B

Abstract:
1. A movable gripper for machines for the packaging of products with stretchable film, placed under a posterior folder having a pusher for the expulsion of the packaged product, disposed on a horizontal translation carriage, said movable gripper comprising: a flat upper jaw, supported by a forked arm, said forked arm pivotally mounted upon a forked arm shaft, said forked arm shaft being horizontal and parallel to said carriage and rotatably supported by at least a pair of parallel supports interconnected to the median and lower portion of the carriage; a lower jaw supported by a lower jaw arm, said lower jaw arm fixed on said forked arm shaft; a first square lever with a lateral appendix disposed at an end of said forked arm shaft, said first square lever for the co-operation with a cam for the opening and closing operations of a first gripper; an eccentric element keyed on a support shaft, parallel to the forked arm shaft, said eccentric element for maintaining the support shaft horizontally or for lowering the support shaft, said support shaft rotatably supported by one of the pair of parallel supports; and a second square lever located at an end of the support shaft for co-operation with the cam which the second square lever contacts during movement of the carriage, wherein said eccentric element cooperates with a portion of said upper jaw extending laterally away from said first gripper and a forked portion of the stem of the upper jaw to control oscillation of the first gripper around the forked shaft.