Bondbloxx Bloomberg One Year Target Duration US Treasury ETF
Oscillating Gate Powder Recoater for Three-Dimensional Printer

Abstract:

Powder-layer three-dimensional printer recoaters are disclosed which comprise a controllably vibrated traveling powder dispenser having a hopper section adapted to contain a build powder, an opening through which the powder can be controllably discharged laterally into a chamber which is located beside the opening and which has a mesh covering at least a portion of its bottom. A gate is located with its bottom portion proximal to the opening and is adapted so that its bottom portion horizontally oscillates with respect to the hopper. The recoaters also comprise a vibrator that is operably connected to the traveling powder dispenser and is adapted to selectively cause the powder to flow from the hopper through the opening and be discharged through the mesh and the bottom portion of the gate to horizontally oscillate. In some embodiments, the recoaters also comprise a smoothing device which is adapted to smoothen the powder dispensed through the mesh.