Can bottom former assembly
An actuator assembly for dynamically or manually positioning a dome die and clamp ring of a can bottom former assembly. The actuator assembly is also usable for other purposes where accurate and repeatable adjustments in position are needed. The actuator assembly may include an anchor member and at least one torsion rod having a torque end and an actuation end, with 2 bends at or near the actuation end, such that a torque applied to the torque end creates a substantially linear actuation force at or near the actuation end of the torsion rod.
1. An actuator assembly operated by torque, comprising:
an actuation member having a first end, a second end, and an axis, the first end having a fixed position relative to a housing, the actuation member having a length and being bendable along its length;
an anchor member spaced apart from the first end of the actuation member; and
at least one torsion rod having a torque end and an actuation end, the at least one torsion rod further comprising a first bend and a second bend between the torque end and the actuation end, wherein the actuation end is pivotally connected to the anchor member and wherein the at least one torsion rod is pivotally coupled to the actuation member proximate the first bend, between the first bend and the torque end;
wherein a torque applied to the at least one torsion rod proximate to the torque end creates an actuation force having a translational component proximate the first bend of the at least one torsion rod; and
wherein the actuation force displaces the second end of the actuation member in a direction substantially normal to the axis.
2. The actuator assembly of claim 1 , wherein the actuation end of the at least one torsion rod is positionally anchored but allowed to rotate.
3. The actuator assembly of claim 2 , further comprising a torsion rod linkage connected to the torque end of the at least one torsion rod to apply the torque.
4. The actuator assembly of claim 3 , wherein the first bend and the second bend are configured to create the translational component of force due to a distance from the center of rotation of the actuation end and the first bend.
5. The actuator assembly of claim 1 , wherein the at least one torsion rod comprises at least a first torsion rod and a second torsion rod, the first and second torsion rods being configured to create substantially equal translational forces on the actuation member.
6. The actuator assembly of claim 5 , wherein the substantially equal translational forces are in substantially the same direction.
7. The actuator assembly of claim 6 , wherein a rotational force component created by the first torsion rod is substantially counteracted by a rotational force component created by the second torsion rod.
8. The actuator assembly of claim 7 , wherein torque is applied to the first and second torsion rods in opposite directions.
9. The actuator assembly of claim 1 , wherein the at least one torsion rod comprises at least a first torsion rod and a second torsion rod, the first and second torsion rod being configured to create translational forces on the actuation member, the translational forces having different directions.
10. The actuator assembly of claim 9 , wherein the translational forces are substantially perpendicular to each other.
11. The actuator assembly of claim 1 , wherein the at least one torsion rod comprises a first pair of torsion rods and a second pair of torsion rods, and wherein the first pair of torsion rods comprises a first torsion rod and a second torsion rod, the first and second torsion rods being configured to create substantially equal translational forces on the actuation member in substantially the same direction, and wherein the second pair of torsion rods comprises a third torsion rod and a fourth torsion rod, the third and fourth torsion rods being configured to create substantially equal translational forces on the actuation member in substantially the same direction.
12. The actuator assembly of claim 11 , wherein a rotational force component created by the first torsion rod is substantially counteracted by a rotational force component created by the second torsion rod, and wherein a rotational force component created by the third torsion rod is substantially counteracted by a rotational force component created by the fourth torsion rod, wherein the resulting translational forces of one or both torsion rod pairs move the actuation member.
13. The actuator assembly of claim 12 , wherein torque is applied to the first and second torsion rods in opposite directions by a first cross linkage shuttle, and wherein torque is applied to the third and fourth torsion rods in opposite directions by a second cross linkage shuttle.
14. The actuator assembly of claim 13 , wherein the first cross linkage shuttle is pivotally connected to the first and second torsion rods by first torsional linkages, and wherein the second cross linkage shuttle is pivotally connected to the third and fourth torsion rods by second torsional linkages.
15. The actuator assembly of claim 14 , wherein the first cross linkage shuttle applies torque as a result of being moved by a first motion actuator, and wherein the second cross linkage shuttle applies torque as a result of being moved by a second motion actuator.
16. The actuator assembly of claim 15 , wherein the first and second motion actuators are manually operated.
17. The actuator assembly of claim 14 , wherein the first and second motion actuators are power operated.
18. The actuator assembly of claim 17 , further comprising an array of strain sensors configured to measure force on the actuation member, wherein a signal from the array of strain sensors is used to position the actuation member by driving at least one of the motion actuators.
19. The actuator assembly of claim 18 , wherein the first and second motion actuators are electrically powered.
20. The actuator assembly of claim 18 , wherein the first and second motion actuators are pneumatic.
21. The actuator assembly of claim 18 , wherein the first and second motion actuators are hydraulic.
22. The actuator assembly of claim 18 , wherein the actuation member comprises a support tube, wherein movement of the support tube is used to position a dome die and a clamp ring of a can bottom former assembly.
23. The actuator assembly of claim 1 , further comprising at least one strain sensor configured to measure force on the actuation member, wherein a signal from the at least one strain sensor is used to position the actuation member.
24. The actuator assembly of claim 1 , further comprising at least one strain sensor configured to measure force on the actuation member, wherein a signal from the at least one strain sensor is used in a feedback loop to position the actuation member.
25. An actuator assembly operated by torque, comprising:
an anchor member; and
at least four torsion rods, each torsion rod having a torque end and an actuation end and further comprising a first bend and a second bend between the torque end and the actuation end, wherein the torque ends of the at least four torsion rods are positionally anchored but allowed to rotate, and wherein the actuation ends are pivotally connected to the anchor member, wherein a torque applied to each torsion rod at the torque end creates an actuation force having a translational component proximate the first bend of each torsion rod; and
wherein the at least four torsion rods comprise a first pair of torsion rods and a second pair of torsion rods, and wherein the first pair of torsion rods comprises a first torsion rod and a second torsion rod, the first and second torsion rods being configured to create substantially equal translational forces on the actuation member in substantially a first direction, and wherein the second pair of torsion rods comprises a third torsion rod and a fourth torsion rod, the third and fourth torsion rods being configured to create substantially equal translational forces on the actuation member in substantially a second direction.
26. The actuator assembly of claim 25 , wherein the first direction and the second direction are substantially perpendicular to each other.
27. The actuator assembly of claim 26 , further comprising an array of strain sensors configured to measure force on the actuation member, wherein a signal from the array of strain sensors is used to position the actuation member by actuating the torsion rods.
28. The actuator assembly of claim 27 , wherein the actuation member comprises a support tube, wherein movement of the support tube is used to position a dome die and a clamp ring of a can bottom former assembly.