Patent ID: 7877964
Filing Date: 2011-02-01
Classification: A47C,B68G,Y10T

Abstract:
1. A method for the production of a pocketed spring unit comprising the steps of compressing and feeding a plurality of springs into troughs or castellations in opposed conveyor belts, moving said springs from said troughs or castellations to a position between upper and lower layers of fabric or other material step-wise advancing said material and said springs in the direction of the output of the apparatus and welding together said lengths of fabric or other material at each step-wise advancement by a plurality of sequentially controlled welding anvils so as to form a plurality of discrete pockets each containing a spring, wherein said springs are fed to the positions between the opposed conveyor belts by means of an inserter mechanism, operation of said mechanism simultaneously compressing said springs, and wherein the means to feed the compressed springs between said lengths of fabric or other material are power-driven spring inserters each having a plurality of arms adapted to enter and leave the castellations or troughs in said belts, said arms being greater in overall height than the height of the springs when the springs are between the belts and making contact with said springs to move said springs between said layers of fabric or other material.