Mixing apparatus for feed to injection molding machine
OwnerTheodor M. Boxinventor
Life of this patent
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Abstract
Apparatus for grinding pigment and for introducing predetermined amounts of pigment to plastic material being fed to an injection molding machine. The pigment is ground from bars by a helical grinder energized by variable speed means which controls the ratio of pigment to plastic in the feed to the injection screw. Positive displacement pigment feeding means is included having automatic disengagement means associated with the feeding means for disengaging the latter when the pigment material has become substantially exhausted. The feeding means is chain driven and is adjustable relative to the chain to ensure there is no slack between the feeding means and the pigment bars.
Claims4
In an injection molding machine of the type for molding articles from particulate plastic material fed in measured amounts from a hopper to a reciprocally operated injection screw and having a color grinder associated with said hopper for introducing predetermined amounts of pigment to said plastic material, the improvement comprising variable speed means interconnected with said color grinder to control the amount of pigment relative to the amount of plastic material being fed to said injection screw, propulsion means associated with said color grinder for providing positive displacement feeding of said pigment to said color grinder, and safety release means on said pigment propulsion means for disengaging the latter means when said propulsion means moves near said grinder.
Dependencies are inferred from the claim text.