Importance

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Abstract

Apparatus for forming a resilient unit comprises a conveyor and first and second spring supply stations, arranged in use to deposit respectively first and second spring types and under compression onto the conveyor. At the pocketing station the springs are urged from the conveyor into positions between upper and lower sheets, by a plurality of inserter devices that move together in a reciprocating fashion, before retracting to the position shown. Upper and lower computer-controlled welding tools come together at positions between the springs to join the sheets together. After each welding event the resilient unit is indexed forwards a distance equal to one pocket width in the direction by computer-controlled drive means. The next row of springs is then conveyed into position ready for insertion between the sheets of material, and the process is repeated.

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First Claim