Method and apparatus for the production of a pocketed spring unit
Disclosed are methods, apparatus, devices, and other implementations, including a method for the production of a pocketed spring unit that includes compressing a plurality of springs, moving the springs to positions between upper and lower layers of fabric or other material, step-wise advancing the material and the springs in a spring unit output direction, and welding together the lengths of fabric or other material at each step-wise advancement to produce a pattern of welds in which are formed a plurality of discrete pockets, each containing a spring.
1. A method for the production of a pocketed spring unit comprising the steps of compressing a plurality of springs, moving said springs to positions between upper and lower layers of fabric or other material step-wise advancing said material and said springs in a spring unit output direction and welding together said lengths of fabric or other material at each step-wise advancement to produce a pattern of welds in which are formed a plurality of discrete pockets each containing a spring.
2. Apparatus for forming a pocketed spring unit comprising means for compressing springs, means for moving said compressed springs in a spring unit output direction to positions between upper and lower lengths of fabric or other material, means for sequentially advancing said lengths and said springs in said direction, and welding means for sequentially welding together said lengths to produce a pattern of welds in which are formed a plurality of discrete pockets each containing a spring.
3. Apparatus according to claim 2 , wherein the means for moving the compressed springs to positions between said lengths of fabric or other material are power-driven spring inserters each having a plurality of arms, said arms being greater in overall height than the height of the springs and making contact with said springs to move said springs between said layers of fabric or other material.
4. Apparatus according to claim 2 , wherein said welding means is a plurality of movable welding anvils and a plurality of co-operating welding horns, said welding means being adapted to sequentially weld said layers together at each sequential movement of said layers and said springs so as to form said discrete pockets.