Feed nozzle for injection-molding machine

In combination with an injection-molding mold formed with a rearwardly open cup-shaped recess having an apex at which opens a gate orifice connected to a mold cavity, a nozzle comprising:

• a nozzle body centered on an axis aligned with the orifice and formed with an axially extending central passage adapted to receive a hot melt, the body having a forwardly projecting tip spacedly received in the recess and itself formed with at least one radially throughgoing branch passage;
• a seal ring surrounding and radially inwardly engaging the tip in the recess, bearing radially outward on the mold in the recess, and forming an annular rear end face rearwardly closing the recess, the branch passage extending radially from the central passage and opening into the recess at a location spaced as far as possible from the gate orifice and immediately adjacent the end face, whereby the melt can flow from the central passage through the branch passage to the recess and thence through the gate orifice into the mold cavity, the tip also being formed with a throughgoing bore axially aligned with the gate orifice;
• a nozzle pin axially shiftable in the body between an extended position projecting from the bore and fitting into and blocking the gate orifice and a retracted position unblocking the orifice;
• and
• actuator means for shifting the pin between its positions.