Multi-head spring coilers and methods of using same

A system for manufacturing a string of pocketed coil springs, the system comprising:

• a coil-forming subsystem configured to simultaneously produce two coil springs;
• a spring transporter subsystem configured to simultaneously and separately receive the two coil springs at a first position and subsequently simultaneously convey the two coil springs to a second position;
• a spring compressor subsystem configured to simultaneously compress the two coil springs;
• a fabric-folding subsystem comprising an angled member configured to receive a piece of fabric comprising a first edge and a second edge, the angled member further configured to fold the piece of fabric to create an open side comprising the first and second edges of the fabric and a folded edge comprising a midpoint in the fabric between the first and second edges of the fabric, the folded piece of fabric comprising top and bottom surfaces;
• a spring inserter subsystem configured to simultaneously receive the two compressed coil springs and subsequently simultaneously insert the two compressed coil springs between the top and bottom surfaces of the folded piece of fabric;
• a first welder subsystem configured to form first welds between the top and bottom surfaces of the folded piece of fabric along lines between the open side and the folded edge of the folded piece of fabric;
• and
• a second welder subsystem configured to form second welds between the top and bottom surfaces of the folded piece of fabric along the open side of the folded piece of fabric, the first welds and the second welds forming a plurality of pockets in the piece of fabric, each of the plurality of pockets comprising a compressed coil spring.