Conveyor system with diverting track network

• US 7,055,669 B2
• Filed: 04/22/2005
• Issued: 06/06/2006
• Est. Priority Date: 11/01/2001
• Status: Expired due to Term

• Current Assignee: Dematic Corporation (KION GROUP AG)
• Original Assignee: Dematic Corporation (KION GROUP AG)
• Inventors: Veit, Frank W.
• Primary Examiner(s): Bidwell, James R.
• Application Number:
  US10/907,970
• Publication Number:
  US 20050241911A1
• Time in Patent Office: 410 Days
• Field of Search: 198/370.02, 198/370.07
• US Class Current: 198/370.02
• CPC Class Codes: B65G 2207/36 Pushing shoes on conveyors
• CPC Class Codes: B65G 47/844 the article-engaging elements being pushers transversally movable on the supporting surface, e.g. pusher-shoes

Abstract

A conveyor sorter and method of laterally displacing articles for diverting articles from a conveying surface includes providing a plurality of movable pushers that are associated with the conveying surface and adapted to move transversely across the conveying surface. A plurality of diverting rails are configured to guide selected ones of the movable pushers across the conveying surface. A plurality of diverters are adapted to selectively divert at least one movable pusher to the diverting tracks when activated into a diverting state. The diverting tracks may include segments that are oriented at different angles with respect to the direction of movement of the conveying surface. This causes selected pusher shoes to be laterally displaced at a first rate during an initial portion of the travel and at a second rate during a subsequent portion of the travel.

Claims

1. A conveyor sorter, comprising:

a conveying surface movable in a longiudinal direction;

a plurality of pusher shoes capable of traveling laterally of said conveying surface;

at least one diverting rail configured to selectively guide at least one of said pusher shoes laterally of said conveying surface; and

at least one diverter associated with said at least one diverting rail, said at least one diverter adapted to selectively transfer the at least one of said pusher shoes to said at least one diverting rail;

wherein said at least one diverting rail having at least a first portion adjacent said at least one diverter and a second portion extending from an end of said first portion away from said at least one diverter, said first portion having a first angle with respect to said longitudinal direction and said second portion having a second angle with respect to said longitudinal direction that is different from said first angle, wherein the at least one of said pusher shoes guided by said at least one diverting rail initially contacts an article on said conveying surface at said first portion, wherein said first angle configured to produce a first lateral force of the at least one of said pusher shoes contacting an article, said second angle configured to produce a second lateral force of the at least one pusher shoe wherein said second lateral force is higher than said first lateral force.

2. The sorter of claim 1 including a control, said control sensing said pusher shoes and selectively operating said at least one diverter to selectively transfer at least one of said pusher shoes to said at least one diverting rail.

3. The sorter of claim 1 wherein said at least one diverting rail is at least partialiy curved.

4. The sorter of claim 1 including a gradual junction between said first portion and said second portion.

5. The sorter of claim 1 wherein said second portion is adjacent a terminal portion of said at least one diverting rail.

6. The sorter of claim 1 further including a branch conveyor extending at an angle from a lateral side of said sorter opposite from said at least one diverter, said second portion of said at least one diverting rail being substantially parallel to a longitudinal center-line of said branch conveyor.

7. The sorter of claim 1 wherein said at least one diverting rail comprises a plurality of diverting rails and said at least one diverter comprises a plurality of diverters and further wherein said plurality of diverting rails are generally parallel to each other.

8. The sorter of claim 7 wherein said plurality of diverting rails and said plurality of diverters cooperate to divert an individual article.

9. The sorter of claim 8 wherein said plurality of diverting rails and said plurality of diverters divert an individual article without substantial rotation of that article.

10. The sorter of claim 8 wherein said plurality of diverting rails and said plurality of diverters divert an individual article with an initial rotation of that article.

11. The sorter of claim 7 further including a controller adapted to cause at least two of said diverters to substantially simultaneously transfer at least two of said pusher shoes onto at least two of said diverting rails.

12. A method of laterally displacing articles, said method comprising:

providing a conveying surface traveling in a longitudinal direction;

providing a plurality of pusher shoes;

selecting particular ones of said pusher shoes to laterally displace an article on said conveying surface; and

laterally displacing the particular ones of said pusher shoes including initially impacting an article with the particular ones of said pusher shoes and subsequently displacing the article after said impacting with the particular ones of said pusher shoes, said impacting comprising laterally displacing the particular ones of said pusher shoes at a first lateral rate, said subsequently displacing comprising laterally displacing the particular ones of said pusher shoes at a second lateral rate, said second lateral rate being higher than said first lateral rate.

13. The method of claim 12 including providing a branch conveyor extending laterally at an angle to said conveying surface, wherein said second lateral rate causing the article to align with said branch conveyor.

14. The method of claim 12 including laterally displacing an article without substantial rotation of that article.

15. The method of claim 12 including laterally displacing an article with at least a partial initial rotation of that article.

16. The method of claim 12 including providing a gradual transition between said first lateral rate and said second lateral rate.

17. A method of laterally displacing articles, said method comprising:

providing a conveying surface traveling in a longitudinal direction and a plurality of pusher shoes capable of traveling laterally of said conveying surface;

providing at least one diverting rail and selectively guiding at least one of said pusher shoes laterally of said conveying surface with said at least one diverting rail;

providing at least one diverter associated with said at least one diverting rail and selectively transferring the at least one of said pusher shoes to said at least one diverting rail with said at least one diverter;

wherein said at least one diverting rail having at least a first portion adjacent said at least one diverter and a second portion extending from an end of said first portion away from said at least one diverter;

said selectively guiding including initially impacting an article with the at least one of said pusher shoes and subsequently displacing the article after said impacting with the at least one of said pusher shoes, said impacting comprising laterally displacing the at least one of said pusher shoes at a first lateral rate, said subsequently displacing comprising laterally displacing the at least one of said pusher shoes at a second lateral rate, said first lateral rate causing the at least one of said pusher shoes to apply an impact force to the article, said second lateral rate causing the at least one of said pusher shoes to apply a subsequent force to the article, said subsequent force being higher than said impact force.

18. The method of claim 17 wherein said second portion is adjacent a terminal portion of said at least one diverting rail.

19. The method of claim 17 including providing a branch conveyor extending at an angle from a lateral side of said conveying surface opposite from said at least one diverter, said second portion of said at least one diverting rail being substantially parallel to a longitudinal center line of said branch conveyor.

20. The method of claim 17 wherein said at least one diverting rail comprises a plurality of diverting rails and said at least one diverter comprises a plurality of diverters and further wherein said plurality of diverting rails are generally parallel to each other.

21. The method of claim 20 including diverting an article by diverting a plurality of said pusher shoes to said plurality of diverting rails with said plurality of diverters.

22. The method of claim 20 including laterally displacing an article without substantial rotation of that article.

23. The method of claim 20 including laterally displacing an article with an initial rotation of that article.

24. The method of claim 17 including providing a branch conveyor extending laterally at an angle to said conveying surface, wherein said second lateral rate causing the article to align with said branch conveyor.

25. The method of claim 17 including laterally displacing an article without substantial rotation of that article.

26. The method of claim 17 including laterally displacing an article with at least a partial initial rotation of that article.

27. The method of claim 17 including providing a gradual transition between said first lateral rate and said second lateral rate.

28. The method of claim 17 wherein said at least one diverting rail is at least partially curved.

29. The sorter of claim 17 including providing a gradual junction between said first portion and said second portion.