Carousel conveyor and method

• US 8,322,518 B2
• Filed: 04/15/2010
• Issued: 12/04/2012
• Est. Priority Date: 04/15/2010
• Status: Active Grant

• Current Assignee: Laitram LLC
• Original Assignee: Laitram LLC
• Inventors: Ball, Jonathan
• Primary Examiner(s): HESS, DOUGLAS A
• Application Number:
  US12/760,603
• Publication Number:
  US 20110253507A1
• Time in Patent Office: 964 Days
• Field of Search: 198/580, 198/604, 198/605, 198/617, 198/620, 198/626.1, 198/779
• US Class Current: 198/580
• CPC Class Codes: B65G 17/24 comprising a series of rollers which are moved , e.g. over a supporting surface, by the traction element to effect conveyance of loads or load-carriers
• CPC Class Codes: B65G 47/244 by turning them about an axis substantially perpendicular to the conveying plane
• CPC Class Codes: B65G 47/5131 by relative displacement between conveyors or conveyor parts and bridging means therebetween

Abstract

Apparatus and method for recirculating articles on a belt conveyor. An article-recirculation path is formed in a pair of parallel conveyor belts running continuously in opposite directions. Article-supporting rollers in each belt rotate to transfer articles from one belt to the other in a transfer region at each end of the conveyor to form an endless recirculation path.

Claims

1. A conveyor for recirculating articles, comprising:

a recirculation section extending in length from a first end to a second end and laterally in width from a first side to a second side;

a first conveyor belt having rotatable article-supporting rollers advancing continuously along the first side of the recirculation section in a first direction from the first end to the second end;

a second conveyor belt having rotatable article-supporting rollers, the second conveyor belt advancing continuously along the second side of the recirculation section in an opposite second direction from the second end to the first end;

wherein the rotatable article-supporting rollers in the first and second conveyor belts are rotated in a first lateral direction in a first transfer region of the of the recirculation section proximate the first end to push articles off the second conveyor belt onto the first conveyor belt and toward the first side in the first transfer region;

wherein the rotatable article-supporting rollers in the first and second conveyor belts are rotated in an opposite second lateral direction in a second transfer region of the recirculation section proximate the second end to push articles off the first conveyor belt onto the second conveyor belt and toward the second side in the second transfer region; and

wherein the rotatable article-supporting rollers in the first and second conveyor belts are arranged to rotate on axes parallel to the first and second directions.

2. A conveyor as in claim 1 further comprising an intermediate region between the first and second transfer regions wherein the rotatable article-supporting rollers are idled.

3. A conveyor as in claim 1 further comprising a first side rail along the first side in the first transfer region and a second side rail along the second side in the second transfer region.

4. A conveyor as in claim 1 wherein the first and second conveyor belts abut each other.

5. A conveyor as in claim 1 wherein the first and second conveyor belts are identical.

6. A conveyor as in claim 1 wherein the first and second conveyor belts are the same length.

7. A conveyor as in claim 1 wherein the first conveyor belt extends in the second direction beyond the first end of the recirculation section.

8. A conveyor as in claim 7 wherein the second conveyor belt extends in the first direction beyond the second end of the recirculation section.

9. A conveyor as in claim 1 further comprising bearing rollers underlying the first and second conveyor belts and contacting the rotatable article-supporting rollers in the first and second transfer regions to cause the rollers to rotate as the first and second conveyor belts advance.

10. A conveyor as in claim 9 wherein the bearing rollers underlying the first conveyor belt in the first transfer region and the bearing rollers underlying the second conveyor belt in the second transfer region are arranged to rotate on first parallel axes oblique to the first and second directions and wherein the bearing rollers underlying the first conveyor belt in the second transfer region and the bearing rollers underlying the second conveyor belt in the first transfer region are arranged to rotate on second parallel axes oblique to the first and second directions and to the first parallel axes.

11. A method for recirculating articles on a conveyor, comprising:

conveying articles atop rollers in first and second conveyor belts advancing continuously in opposite directions;

rotating the rollers in the first and second conveyor belts in a first lateral direction in a first transfer region at one end of a recirculation section of the conveyor to push articles atop the rollers off the second conveyor belt and onto the first conveyor belt in the first transfer region;

rotating the rollers in the first and second conveyor belts in an opposite second lateral direction in a second transfer region at the opposite end of the recirculation section to push articles atop the rollers off the first conveyor belt and onto the second conveyor belt in the second transfer region.

12. The method of claim 11 further comprising:

idling the rollers in the first and second conveyor belts in an intermediate region of the conveyor between the first and second transfer regions.

13. A conveyor for recirculating articles, comprising:

a recirculation section extending in length from a first end to a second end and laterally in width from a first side to a second side;

a first conveyor belt having rotatable article-supporting rollers advancing continuously along the first side of the recirculation section in a first direction from the first end to the second end;

a second conveyor belt having rotatable article-supporting rollers, the second conveyor belt advancing continuously along the second side of the recirculation section in an opposite second direction from the second end to the first end;

wherein the rotatable article-supporting rollers in the first and second conveyor belts are rotated in a first lateral direction in a first transfer region of the of the recirculation section proximate the first end to push articles off the second conveyor belt onto the first conveyor belt and toward the first side in the first transfer region;

wherein the rotatable article-supporting rollers in the first and second conveyor belts are rotated in an opposite second lateral direction in a second transfer region of the recirculation section proximate the second end to push articles off the first conveyor belt onto the second conveyor belt and toward the second side in the second transfer region; and

wherein the rotatable article-supporting rollers in the first and second conveyor belts are arranged to rotate on axes oblique to the first and second directions.

14. A conveyor as in claim 13 further comprising an intermediate region between the first and second transfer regions wherein the rotatable article-supporting rollers are idled.

15. A conveyor as in claim 13 further comprising bearing surfaces underlying and contacting the rotatable article-supporting rollers of the first conveyor belt in the first transfer region and the rotatable article-supporting rollers of the second conveyor belt in the second transfer to cause the rotatable article-supporting rollers to rotate as the first and second conveyor belts advance to push articles on the first conveyor belt toward the first side in the first transfer region and articles on the second conveyor belt toward the second side in the second transfer region.

16. A conveyor as in claim 15 further comprising a first stop at the at the second end of the recirculation section positioned to block articles conveyed on the first conveyor belt causing the rotatable article-supporting rollers in the first conveyor belt to rotate so as to push the blocked articles off the first conveyor belt and onto the second conveyor belt in the second transfer region and a second stop at the at the first end of the recirculation section positioned to block articles conveyed on the second conveyor belt causing the rotatable article-supporting rollers in the second conveyor belt to rotate so as to push the blocked articles off the second conveyor belt and onto the first conveyor belt in the first transfer region.

17. A conveyor as in claim 13 further comprising a first side rail along the first side in the first transfer region and a second side rail along the second side in the second transfer region.

18. A conveyor as in claim 13 wherein the first and second conveyor belts abut each other.

19. A conveyor as in claim 13 wherein the first and second conveyor belts are the same length.

20. A conveyor as in claim 13 wherein the first conveyor belt extends in the second direction beyond the first end of the recirculation section and the second conveyor belt extends in the first direction beyond the second end of the recirculation section.