A device to inject wax into the mold, particularly for lost wax casting in jewelry, silver and costume jewelry, which includes an injector (2) of plastically thermo-deformable material into molds. These molds are arranged to be filled with the plastically deformable material, to create a model. A peculiarity of this device is that the injector (2) is connected, by supply means, to a stock of molds (3) which extends along a vertical direction (10) substantially normal with respect to the ground. This injector is further connected, by expulsion means, to a cooling plate (4) which defines a plane substantially normal with respect to the ground.
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