Abstract: An apparatus for inverting the stop flange on a tamper-indicating closure, from an axially outwardly oriented position as molded to an axially inwardly oriented position for use, includes a support base for supporting the closure such that the stop flange as molded is spaced from and oriented away from the support base. A pedestal is movably carried by the support base at a position spaced from the support base. A locator ring is carried by the pedestal and movable with the pedestal to engage the stop flange on a closure carried by the support base and to bend the stop flange radially inwardly. An inversion ring moves through the locator ring to engage and invert the stop flange that is bent radially inwardly by the locator ring.

Abstract: A compression molding machine includes a wheel mounted for rotation around a horizontal axis and a plurality of angularly spaced molds disposed around the wheel. Each of the molds includes a first mold segment and a second mold segment disposed radially outwardly of the first mold segment. Each of the second mold segments is movable radially with respect to the associated first mold segment between a radially inner closed position with the first mold segment for compression molding a plastic article, and a radially outer open position spaced from the associated first mold segment for removing a molded article from the mold and placing a mold charge into the mold.

Abstract: An apparatus for placing a mold charge into a cavity includes a pair of hubs mounted for rotation around parallel axes, a link connected between the hubs at positions off-center relative to the parallel axes and a blade connected to the link. Rotation of the hubs causes the blade to travel in an elliptical path relative to an extrusion orifice to cut mold charges from the orifice and place the mold charges into cavities passing beneath the blade. The apparatus preferably includes a drive member that simultaneously rotates both of the hubs to drive the blade relative to the extrusion orifice and cavities. The blade preferably includes an arm that extends into a cavity to place a mold charge into the bottom of the cavity for consistent and accurate placement of the mold charges from one cavity to the next.

Abstract: An apparatus for placing a mold charge into a mold of a compression molding machine includes a carrier mounted for rotation around a first axis, at least one arm mounted on the carrier for rotation around a second axis at an angle to the first axis, and a mold charge pick-up cup on the arm for receiving a mold charge, transporting the mold charge and placing the mold charge into a mold of the compression molding machine. A cam is carried in stationary position adjacent to the carrier surrounding the first axis, and a cam follower is operatively coupled to the arm in engagement with the cam for rotating the arm and the mold charge pick-up cup around the second axis as the carrier is rotated around the first axis.

Abstract: Apparatus for compression molding an annular closure shell having a base wall with a center opening and, in accordance with one aspect of the disclosure, includes male and female mold sections having associated male and female mold surfaces that generally oppose each other. The female mold section includes an opening in the female mold surface and a mold pin extending through the opening. The male and female mold surfaces cooperate to generally define the base wall of the annular closure shell and the mold pin cooperates with the male mold section to generally define the center opening of the annular closure shell. Closure of the male and female mold sections forms an annular mold cavity for receiving and compression molding a mold charge into the annular closure shell having the base wall with the center opening, which at least partially surrounds the mold pin.

Abstract: An apparatus for placing a mold charge into a mold of a compression molding machine includes a carrier mounted for rotation around a first axis, at least one arm mounted on the carrier for rotation around a second axis at an angle to the first axis, and a mold charge pick-up cup on the arm for receiving a mold charge, transporting the mold charge and placing the mold charge into a mold of the compression molding machine. A cam is carried in stationary position adjacent to the carrier surrounding the first axis, and a cam follower is operatively coupled to the arm in engagement with the cam for rotating the arm and the mold charge pick-up cup around the second axis as the carrier is rotated around the first axis.

Abstract: An apparatus for placing mold charges into a mold of a compression molding machine includes a carrier, an arm pivotally mounted on the carrier and a mold charge pick-up cup on the arm at a position spaced from the carrier. The arm is pivotal on the carrier between a first position at which the arm is positioned to deposit a mold charge into a mold and a second position at which the mold charge pick-up cup is disposed to transport the mold charge. The carrier preferably is mounted for rotation around an axis. In some embodiments, a cam mechanism is coupled to the arm to pivot the arm as a function of rotation of the carrier. A spring may be coupled between the arm and the carrier for biasing the arm toward one of the first and second positions of the arm. In another embodiment, an actuator is carried by the carrier and coupled to the arm to pivot the arm with respect to the carrier. The arm preferably includes a passage for selective application of air and/or vacuum to the mold charge pick-up cup.

Abstract: An apparatus for compression molding sealing liners in premade closure shells includes a shell loader for presenting premade closure shells in sequence, a mold charge placement device for placing charges of liner material into the premade shells, and a vertical wheel molding machine for receiving the closure shells in sequence from the loader and compression molding the mold charges to form sealing liners within the closure shells. The vertical wheel molding machine preferably includes a wheel mounted for rotation around a horizontal axis and a plurality of angularly spaced molds disposed around the wheel. Each of the molds preferably includes a first mold segment and a second mold segment disposed radially outwardly of the first mold segment. One of the first and second mold segments, preferably the second mold segment, includes a nest for receiving a premade closure shell.

Abstract: An apparatus for placing mold charges into a mold of a compression molding machine includes a carrier, an arm pivotally mounted on the carrier and a mold charge pick-up cup on the arm at a position spaced from the carrier. The arm is pivotal on the carrier between a first position at which the arm is positioned to deposit a mold charge into a mold and a second position at which the mold charge pick-up cup is disposed to transport the mold charge. The carrier preferably is mounted for rotation around an axis. In some embodiments, a cam mechanism is coupled to the arm to pivot the arm as a function of rotation of the carrier. A spring may be coupled between the arm and the carrier for biasing the arm toward one of the first and second positions of the arm. In another embodiment, an actuator is carried by the carrier and coupled to the arm to pivot the arm with respect to the carrier. The arm preferably includes a passage for selective application of air and/or vacuum to the mold charge pick-up cup.

Abstract: A machine for compression molding plastic articles includes an array of compression molds mounted on a support for movement through a defined mold path. A cam is disposed adjacent to the support to engage the molds in sequence and move at least one segment of each mold between open and closed positions. The cam has a first portion for opening the molds, a second portion for closing the molds in sequence and a pivot mounting the second cam portion to the first cam portion. A latch holds the second cam portion in a first position for closing the molds in sequence, and is responsive to excess force on the second cam portion to release said second cam portion to pivot to a second position spaced from the path.

Abstract: A compression molding machine includes a wheel mounted for rotation around a horizontal axis and a plurality of angularly spaced molds disposed around the wheel. Each of the molds includes a first mold segment and a second mold segment disposed radially outwardly of the first mold segment. Each of the second mold segments is movable radially with respect to the associated first mold segment between a radially inner closed position with the first mold segment for compression molding a plastic article, and a radially outer open position spaced from the associated first mold segment for removing a molded article from the mold and placing a mold charge into the mold.

Abstract: An apparatus for placing mold charges into a mold of a compression molding machine includes at least one mold charge pick-up cup for receiving a severed charge of molten plastic, a vacuum source for applying a vacuum to the pick-up cup to retain the mold charge in the cup, and a source of gas (such as air) under pressure for periodically applying gas to the cup to release the mold charge from the cup. In one exemplary embodiment, the vacuum source applies a continuous vacuum to the cup, and the source of gas under pressure periodically applies gas to the cup to overcome the continuous vacuum at the cup. In another exemplary embodiment, vacuum and gas under pressure, are alternately applied to the cup. The vacuum source preferably includes a vacuum generator coupled to the source of gas under pressure for generating the vacuum to be applied to the cup. The vacuum source preferably includes a vacuum pump coupled to the source of gas under pressure for generating the vacuum to be applied to the cup.

Abstract: A compression molding machine includes a wheel mounted for rotation around a horizontal axis and a plurality of angularly spaced molds disposed around the wheel. Each of the molds includes a first mold segment and a second mold segment disposed radially outwardly of the first mold segment. Each of the second mold segments is movable radially with respect to the associated first mold segment between a radially inner closed position with the first mold segment for compression molding a plastic article, and a radially outer open position spaced from the associated first mold segment for removing a molded article from the mold and placing a mold charge into the mold.

Abstract: An apparatus for inverting the stop flange on a tamper-indicating closure, from an axially outwardly oriented position as molded to an axially inwardly oriented position for use, includes a support base for supporting the closure such that the stop flange as molded is spaced from and oriented away from the support base. A pedestal is movably carried by the support base at a position spaced from the support base. A locator ring is carried by the pedestal and movable with the pedestal to engage the stop flange on a closure carried by the support base and to bend the stop flange radially inwardly. An inversion ring moves through the locator ring to engage and invert the stop flange that is bent radially inwardly by the locator ring.

Abstract: An apparatus for severing mold charges of molten plastic exiting an orifice along an orifice axis includes a motor system that provides a rotary output around an axis offset from the orifice axis. A blade arm is eccentrically coupled to the rotary output of the motor system for motion in a plane at an angle to the orifice axis, preferably perpendicular to the orifice axis. A knife blade is coupled to the blade arm and disposed to oscillate in a closed path, preferably an elliptical path, that intersects the orifice axis so that the knife blade engages and severs molten plastic exiting the orifice along the orifice axis. A control arm preferably is pivotally coupled to the blade arm and to a point that is fixed with respect to the orifice axis to control motion of the blade arm and the knife blade. The motor system preferably is mounted on a base, and has an output shaft that extends through the base and a hub coupled to the output shaft.

Abstract: A compression molding machine includes a support mounted for rotation around an axis and a plurality of angularly spaced molds disposed around the support. Each of the molds includes a first mold segment and a second mold segment. At least one of the mold segments is movable with respect to the other mold segment between a closed position for compression molding a plastic article, and an open position for removing a molded article from the mold and placing a mold charge into the mold. An apparatus is provided for placing mold charges into the molds in sequence.

Abstract: A machine for compression molding plastic closures includes a support mounted for rotation around an axis, and a plurality of compression molds on the support at angularly spaced positions around the axis. Each of the molds includes a male mold section and a female mold section, at least one of which is movable with respect to the other between a closed position to form a compression mold cavity and an open position spaced from each other. The male mold section includes a mold core and a stripper sleeve surrounding the mold core for movement both rotationally and axially of the mold core. A first screw drive couples the female mold section to the stripper sleeve for rotating the stripper sleeve around the mold core as the at least one mold section is moved between the closed and open positions. A second screw drive couples the stripper sleeve to the support to move the stripper sleeve axially over the mold core as the stripper sleeve is rotated around the core.