Patent ID: 7299609
Filing Date: 2007-11-27
Classification: B65B

Abstract:
1. In a packaging machine comprising a main frame, at least one work station having a vertically-movable lower tool and an upper tool for forming a package, means for mounting said lower tool, and an actuator for actuating said lower tool for vertical movement toward and away from said upper tool, the improvement comprising: said actuator for actuating said lower tool for vertical movement comprising a piston-cylinder actuator; said piston-cylinder actuator comprising a main cylinder defining a compression chamber, an annular piston mounted for reciprocal movement in said compression chamber, a hollow piston shaft for movement with said piston and having an upper end projecting from the upper end of said main cylinder, and a lower-tool mount affixed to said projecting upper end of said piston shaft fixedly connected to said lower tool; said annular piston defining an outer diameter and an inner diameter, the ratio of said outer diameter to said inner diameter being less than two.