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Coil assembly having permeable hub

  • US 9,090,428 B2
  • Filed: 12/07/2012
  • Issued: 07/28/2015
  • Est. Priority Date: 12/07/2012
  • Status: Active Grant
First Claim
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1. A coil assembly for use with an additive manufacturing system, the coil assembly comprising:

  • a coil of a filament retained in a figure-8 configuration, and having a payout hole for dispensing successive segments of the strand-based material, the payout hole extending from an inner layer of the coil to an outer layer of the coil, wherein the inner layer of the coil defines a core region of the coil, and wherein the coil is configured to unwind loop by loop beginning from the inner layer and moving towards the outer layer as the strand-based material is drawn through the payout hole; and

    a plurality of individually displaceable bodies retained in the core region of the coil to define a nip zone at a bottom portion of the core region, wherein the individually displaceable bodies press against the inner layer of the coil at the nip zone to prevent the filament from forming more than one loop at a time in the core region as the filament is drawn through the payout hole.

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