A hot melt adhesive supply system includes a container configured to receive a supply of unmelted hot melt adhesive pieces, and an agitation device configured to agitate the supply of hot melt adhesive pieces situated in the container. The hot melt adhesive supply system further includes a transfer conduit configured to communicate hot melt adhesive pieces from the container to a hot melt adhesive melter.

A powder delivery system for use in an additive manufacturing device includes a powder control valve configured to selectively divert at least a portion of an input fluid flow to a return line while a remainder of the input flow is delivered to a delivery nozzle. In some embodiments, the powder delivery valve may be modulated to alter the percentage of input flow diverted to the return line. Alternatively, the powder delivery valve may be either fully open or closed. In each embodiment, the powder delivery valve permits rapid changes in the amount of powder delivered to the nozzle.

The present invention relates to a Venturi powder gun comprising a body, an injector of drive gas and an ejector of a mixture comprising the powder product, mounted in the body. The body defines a duct for circulating the mixture, upstream of the ejector. The injector and the ejector are straight and extend respectively along an injector axis and an ejector axis, which coincide when the powder pump is in the assembled configuration. Means for indexing the position of the ejector within the pump body, in rotation about the ejector axis, make it possible to align an inlet of a suction chamber with the mixture circulation duct defined by the pump body.