Top registered item transport system

1. An item transport system, comprising:

a first transport element rotating around a plurality of first transport rollers in a first direction;

a second transport element in opposing relation to the first transport element, the second transport element rotating around a plurality of second transport rollers in a second direction opposite to the first direction, wherein items received between the transport elements are conveyed along a transport path;

a guide plate proximate to the first transport element for engaging the items during processing by an item processing element; and

an item registration device configured to maintain the items in registration with the guide plate, the item registration device comprising:

a plurality of independently articulating pivot assemblies biased to engage the second transport element with the first transport element; and

a plate associated with each pivot assembly, wherein each plate is fixedly constrained with respect to the pivot assembly at one end and slidably constrained with respect to the pivot assembly at another end.

2. The system of claim 1 , wherein the pivot assemblies are configured to provide positive control between the transport elements for consecutive items having a thickness differential.

3. The system of claim 2 , wherein the thickness differential is up to approximately 1.75 inches.

4. The system of claim 1 , wherein the plurality of independently articulating pivot assemblies comprises:

an upstream angle pivot assembly;

a downstream angle pivot assembly; and

at least one intermediate pivot assembly disposed between the upstream angle pivot assembly and the downstream angle pivot assembly.

5. The system of claim 4 , wherein each pivot assembly comprises:

a first member pivotable about a pivot axis;

at least one of the second transport rollers disposed on the first member; and

a plate support element disposed on the first member.

6. The system of claim 5 , wherein the pivot axis is substantially perpendicular to the transport path.

7. The system of claim 5 , wherein the upstream angle pivot assembly and the downstream angle pivot assembly further comprise:

a second member arranged at an angle with respect to the first member and pivotable with the first member about the pivot axis; and

at least one of the second transport rollers disposed on the second member.

8. The system of claim 5 , wherein the item registration device further comprises:

an upstream roller assembly supporting at least one of the second transport rollers and comprising a plate support element; and

a downstream roller assembly supporting at least one of the second transport rollers.

9. The system of claim 8 , wherein each plate is fixedly constrained at an upstream end and slidably constrained at a downstream end.

10. The system of claim 9 , wherein each plate is connected to respective plate support elements.

11. The system of claim 1 , wherein each pivot assembly comprises a follower.

12. The system of claim 11 , further comprising:

an elongated member;

a plurality of cams disposed on the elongated member, wherein each cam engages a respective follower; and

an actuator for translating the elongated member, wherein translation of the elongated member causes rotation of the cams and corresponding motion of the respective followers to move the pivot assemblies to a deactivated position in which the second transport element is spaced from the first transport element.

13. The system of claim 1 , wherein the item processing element comprises an inkjet printer.

14. An item transport system, comprising:

a first transport element rotating around a plurality of first transport rollers in a first direction;

a second transport element in opposing relation to the first transport element, the second transport element rotating around a plurality of second transport rollers in a second direction opposite to the first direction, wherein items received between the transport elements are conveyed along a transport path;

a guide plate for maintaining the items at a fixed distance from an item processing element during processing by the item processing element; and

an item registration device configured to maintain the items in registration with the guide plate, the item registration device comprising:

an upstream roller assembly supporting at least one of the second transport rollers;

a downstream roller assembly supporting at least one of the second transport rollers;

a plurality of independently articulating pivot assemblies biased to engage the second transport element with the first transport element; and

a plate associated with each pivot assembly, wherein each plate is fixedly constrained with respect to the pivot assembly at one end and slidably constrained with respect to the pivot assembly at another end.

15. The system of claim 14 , wherein the pivot assemblies are configured to provide positive control between the transport elements for consecutive items having a thickness differential of up to approximately 1.75 inches.

16. The system of claim 14 , wherein the plurality of independently articulating pivot assemblies comprises:

an upstream angle pivot assembly;

a downstream angle pivot assembly; and

at least one intermediate pivot assembly disposed between the upstream angle pivot assembly and the downstream angle pivot assembly.

17. The system of claim 16 , wherein each pivot assembly comprises:

a first member pivotable about a pivot axis;

at least one of the second transport rollers disposed on the first member; and

a plate support element disposed on the first member.

18. The system of claim 17 , wherein the upstream angle pivot assembly and the downstream angle pivot assembly further comprise:

a second member arranged at an angle with respect to the first member and pivotable with the first member about the pivot axis; and

at least one of the second transport rollers disposed on the second member.

19. The system of claim 14 , wherein each plate is fixedly constrained at an upstream end and slidably constrained at a downstream end.

20. The system of claim 14 , wherein the item processing element comprises an inkjet printer.

21. A method of conveying items, comprising:

receiving the items in an item transport system, wherein the item transport system comprises:

a first transport element rotating around a plurality of first transport rollers in a first direction; and

a second transport element in opposing relation to the first transport element, the second transport element rotating around a plurality of second transport rollers in a second direction opposite to the first direction;

conveying the items between the transport elements along a transport path; and

maintaining the items in registration with a guide plate during processing of the items by an item processing element using an item registration device, the item registration device comprising:

a plurality of independently articulating pivot assemblies biased to engage the second transport element with the first transport element; and

a plate associated with each pivot assembly, wherein each plate is fixedly constrained with respect to the pivot assembly at one end and slidably constrained with respect to the pivot assembly at another end.

22. The method of claim 21 , further comprising providing positive control between the transport elements for consecutive items having a thickness differential of up to approximately 1.75 inches.

23. The method of claim 21 , wherein the item processing element comprises an inkjet printer.