Continuous motion neck calibrated wheel
A machine ( 10 ) for blow molding containers ( 100 ). The machine ( 10 ) has a stationary flow head ( 26 ) located proximate a turntable ( 12 ) on which molds ( 16 ) are mounted. A dwell cam mechanism ( 110, 120, 132 ) on the turntable causes the molds to accelerate ahead of the turntable, stop under the flow head to receive a parison ( 31 ), then accelerate to catch up with the turntable. This sequence allows the turntable to rotate continuously. Blow pins ( 30 ) mounted on the turntable inject gas into the molds to blow mold the parison while traveling a first path ( 144 ). Paddles ( 142 ) grip the molded containers and travel a second path ( 146 ) radially outward from the first path. The containers blow-molded from the parisons at a first station ( 18 ) are retained on the turntable after the turntable completes one full revolution and again passes the first station.
1. A machine for blow-molding containers from a parison, the machine comprising:
a turntable continuously rotating about an axis of rotation in an endless circle without stopping;
a flow head forming and providing the parison and being fixedly positioned at a first station of the machine proximate the turntable;
a plurality of molds carried by the turntable to position each of the molds adjacent the flow head in turn, each mold including mold portions which are movable between an open configuration to receive the parison from the flow head and a closed configuration to mold the parison; and
a dwell cam mechanism located on the turntable and including (a) a dwell cam track having undulations that divide the dwell cam track into a first segment, a second segment, and a third segment and (b) a dwell cam follower engaging the undulations as the turntable rotates, the dwell cam follower engaging the first segment configured to cause initial acceleration of the mold, the second segment configured to stop the mold, and the third segment configured to cause final acceleration of the mold, the dwell cam mechanism initially accelerating each mold in turn from an initial location relative to the turntable as the mold approaches the first station to position the mold adjacent the flow head, stopping the mold adjacent the flow head while the mold receives the parison and the turntable continues to rotate, then finally accelerating the mold relative to the turntable as the mold leaves the first station to position the mold at its initial location relative to the turntable.
2. The machine according to claim 1 , further comprising a lifting cam mechanism located on the turntable, the lifting cam mechanism moving each mold in turn radially outward relative to the axis of rotation from an initial position as the mold approaches the first station to position the mold adjacent the flow head and radially inward relative to the axis of rotation as the mold leaves the first station to return the mold to its initial position.
3. The machine according to claim 2 , wherein the lifting cam mechanism positions the mold adjacent the flow head approximately when the dwell cam mechanism stops the mold adjacent the flow head.
4. The machine according to claim 2 , wherein the lifting cam mechanism includes:
a plurality of ramps mounted on the turntable, the ramps facing radially outward from the turntable; and
a plurality of carriages, each carriage carrying a mold with one carriage mounted on each ramp and movable along the ramp between the initial mold position and a second position proximate the flow head.
5. The machine according to claim 1 , further comprising a plurality of blow pins mounted on the turntable, at least one blow pin being positioned adjacent to each of the molds, the blow pins being engageable with the molds when in the closed configuration for injecting compressed gas into the molds to effect blow molding of the parison.
6. The machine according to claim 5 , wherein the blow pins create a calibrated neck on the containers.
7. The machine according to claim 5 , further comprising:
paddles gripping the blow-molded containers after the containers have been blow-molded from the parisons;
a blow pin path traveled by the blow pins while blow-molding the containers from the parisons; and
a container path traveled by the paddles while gripping the blow-molded containers, the container path positioned radially outward from, and further from the axis of rotation than, the blow pin path.
8. The machine according to claim 7 , wherein the container blow-molded from the parison received from the flow head at the first station is retained on the turntable after the turntable completes one full revolution and again passes the first station.
9. The machine according to claim 1 , wherein the dwell cam mechanism stops the mold adjacent the flow head for about 0.2 to 0.5 seconds.
10. The machine according to claim 1 , wherein the flow head continuously forms and provides the parison.
11. The machine according to claim 1 , further comprising a control system that coordinates and controls operation of the machine.
12. The machine according to claim 1 , wherein the plurality of molds include different types of molds for molding different types of containers.
13. The machine according to claim 1 , wherein the plurality of molds include a group of first molds for molding a first container and a group of second molds for molding a second container.
14. The machine according to claim 1 , wherein the container blow-molded from the parison received from the flow head at the first station is retained on the turntable after the turntable completes one full revolution and again passes the first station.
15. The machine according to claim 14 , further comprising at least one additional, non-molding feature selected from the group consisting of a vacuum, a chute, a de-flasher, a leak-detection unit, and a labeling device, the additional feature engaging the blow-molded container after the blow-molded container has been retained on the turntable beyond one full revolution.
16. A machine for blow-molding containers from a parison, the machine comprising:
a turntable continuously rotating about an axis of rotation in an endless circle without stopping;
a flow head forming and providing the parison and being fixedly positioned at a first station of the machine proximate the turntable;
a plurality of molds carried by the turntable to position each of the molds adjacent the flow head in turn, each mold including mold portions which are movable between an open configuration to receive the parison from the flow head and a closed configuration to mold the parison;
a plurality of blow pins mounted on the turntable, at least one blow pin being positioned adjacent to each of the molds, the blow pins being engageable with the molds when in the closed configuration for injecting compressed gas into the molds to effect blow molding of the parison;
paddles gripping the blow-molded containers after the containers have been blow-molded from the parisons;
a blow pin path traveled by the blow pins while blow-molding the containers from the parisons; and
a container path traveled by the paddles while gripping the blow-molded containers, the container path positioned radially outward from, and further from the axis of rotation than, the blow pin path,
wherein the container blow-molded from the parison received from the flow head at the first station is retained on the turntable after the turntable completes one full revolution and again passes the first station.
17. A machine for blow-molding containers from a parison, the machine comprising:
a turntable continuously rotating about an axis of rotation in an endless circle without stopping;
a flow head forming and providing the parison and being fixedly positioned at a first station of the machine proximate the turntable; and
a plurality of molds carried by the turntable to position each of the molds adjacent the flow head in turn, each mold including mold portions which are movable between an open configuration to receive the parison from the flow head and a closed configuration to mold the parison;
wherein the container blow-molded from the parison received from the flow head at the first station is retained on the turntable after the turntable completes one full revolution and again passes the first station.
18. The machine according to claim 17 , further comprising at least one additional, non-molding feature selected from the group consisting of a vacuum, a chute, a de-flasher, a leak-detection unit, and a labeling device, the additional feature engaging the blow-molded container after the blow-molded container has been retained on the turntable beyond one full revolution.