Conveyor system with diverting track network

• US 6,923,308 B2
• Filed: 10/31/2002
• Issued: 08/02/2005
• Est. Priority Date: 11/01/2001
• Status: Expired due to Term

• Current Assignee: Dematic Corporation (KION GROUP AG)
• Original Assignee: Rapistan Systems Advertising Corporation (OSI Systems Incorporated)
• Inventors: Veit, Frank W.
• Primary Examiner(s): Lillis, Eileen D.
• Assistant Examiner(s): SHARMA, RASHMI K
• Application Number:
  US10/284,591
• Publication Number:
  US 20030079971A1
• Time in Patent Office: 1,006 Days
• Field of Search: 198/370.02, 198/890, 198/890.1, 198/370.03, 198/619
• 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 diverting assembly for diverting articles from a conveying surface includes 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 tracks 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 along the diverting tracks when activated into a diverting state. The diverting tracks may include segments that are oriented at different angles with respect to each other. A controller may select a subset of at least two diverters from the plurality of diverters and activate them into the diverting state. The activation of the diverters may be simultaneous, or the downstream diverter may be activated prior to the upstream diverter being activated.

Claims

1. A diverting system for diverting articles from a conveying surface of a conveyor comprising:

a plurality of movable pushers associated with the conveying surface and adapted to be movable transversely across the conveying surface;

a plurality of diverting tracks configured to guide selected ones of said movable pushers across the conveying surface;

a plurality of diverters, each said diverter adapted to selectively divert at least one movable pusher to one of said diverting tracks when said diverter is activated into a diverting state; and

a controller for selecting at least two diverters from said plurality of diverters to divert at least two movable pushers, said controller first activating a first one of said selected diverters into the diverting state and subsequently activating a second one of said selected diverters into the diverting state, to divert an article from the conveying surface with said at least two movable pushers.

2. The system of claim 1 further including a sensor for measuring a length of the article to be diverted wherein said at least two diverters are spaced apart by a distance that is less than the measured length of the article to be diverted.

3. The system of claim 1 wherein said plurality of diverting tracks includes at least one diverting track having a first shape and at least one diverting track having a second shape different from said first shape.

4. The system of claim 1 wherein said controller is further adapted to activate said first diverter when a leading edge of the article to be diverted is adjacent said first diverter, and to activate said second diverter when a trailing edge of the article to be diverted is adjacent said second diverter.

5. The system of claim 1 including at least three diverting tracks and at least three diverters, said controller being adapted to select and activate two of said at least three diverters said two of said at least three diverters being separated from each other by at least one intermediate diverter which is not activated into the diverting state.

6. The system of claim 1 wherein said controller is further adapted to activate both said first and second diverters only for a length of time sufficient to cause only a single one of said at least two movable pushers to be diverted by each of said first and second diverters when diverting a single article.

7. The system of claim 1 wherein a plurality of said diverting tracks have at least a first portion and a second portion, 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.

8. The system of claim 7 wherein at least some of said plurality of diverting tracks have a third portion downstream of said second portion, said third portion having a third angle with respect to said longitudinal direction that is different from said second angle.

9. The system of claim 8 wherein said third angle is the same as said first angle.

10. The system of claim 8 further including a take-away conveyor positioned adjacent to a downstream end of said plurality of diverting rails, said third portion of said plurality of diverting tracks being substantially parallel to a longitudinal extent of said take-away conveyor.

11. The system of claim 7 wherein said first portion is adjacent the associated one of said diverters.

12. The system of claim 7 wherein said second portion is adjacent a terminal portion of the associated one of said diverting tracks.

13. The system of claim 7 further including a take-away conveyor positioned adjacent to a downstream end of said plurality of diverting tracks, said second portion of said plurality of diverting tracks being substantially parallel to a longitudinal extent of said take-away conveyor.

14. The system of claim 7 wherein said first angle is defined between said first portion and a side of said sorter adjacent to, and downstream from, said diverters, said second angle is defined between said second portion and said side of said sorter, and said first angle is greater than said second angle.

15. The system 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 follower members onto at least two of said diverting tracks.

16. The system of claim 7 wherein said first angle is defined between said first portion and a side of said sorter adjacent to, and downstream from, said second angle is defined between said second portion and said side of said sorter, and said first angle is less than said second angle.

17. The system of claim 16 wherein at least some of said plurality of diverting tracks have a third portion downstream of said second portion, said third portion having a third angle with respect to said longitudinal direction that is different from said second angle.

18. The system of claim 17 wherein said third angle is the same as said first angle.

19. The system of claim 7 wherein said plurality of diverting tracks are parallel to each other.

20. The system of claim 17, wherein said third angle is defined between said third potion and said side, said third angle being greater than said second angle.

21. The system of claim 17 further including a take-away conveyor positioned adjacent to a downstream end of said plurality of diverting rails, said third portion of said plurality of diverting tracks being substantially parallel to a longitudinal extent of said take-away conveyor.

22. The system of claim 1 wherein said controller is adapted to select at least one of said diverters to be activated into said diverting state, said controller adapted to select said at least one diverter based upon the location of an article'"'"'s axis of rotation on said conveying surface.

23. The system of claim 22 wherein said controller selects said at least one diverter such that the article to be diverted is impacted by one or more or said pusher shoes in locations on the article that are upstream of said axis of rotation and downstream of said axis of rotation.

24. The system of claim 1 wherein said second one of said selected diverters being located upstream of said first one of said selected diverters.

25. A method for diverting articles from a conveying surface of a conveyor comprising:

providing a plurality of movable pushers associated with the conveying surface and adapted to be movable transversely across the conveying surface;

providing a plurality of diverting tracks configured to guide selected ones of said movable pushers across the conveying surface;

providing a plurality of diverters, each said diverter adapted to selectively divert at least one movable pusher to one of said diverting tracks when said diverter is activated into a diverting state;

selecting at least two diverters from said plurality of diverters to divert at least two movable pushers;

activating a first one of said selected diverters into the diverting state to divert at least one of said at least two movable pushers onto one of said diverting tracks; and

activating a second one of said selected diverters into the diverting state to divert another one of said at least two movable pushers onto another one of said diverting tracks substantially after activating said first one of said selected diverters into the diverting state to divert an article from the conveying surface with said at least two movable pushers.

26. The method of claim 25 further including measuring a length of the article to be diverted and selecting said at least two diverters such that they are spaced apart by a distance less than the length of the article to be diverted.

27. The method of claim 25 further including activating said first diverter when a leading edge of the article to be diverted is adjacent said first diverter, and activating said second diverter when a trailing edge of the article to be diverted is adjacent said second diverter.

28. The method of claim 25 including selecting and activating two diverters which are separated from each other by at least one intermediate diverter which is not activated into the diverting state.

29. The method of claim 25 further including activating both said first and second diverters only for a length of time sufficient to cause only a single one of said movable pushers to be diverted by each of said first and second diverters when diverting a single article.

30. A method of claim 25 further including laterally displacing said selected pusher shoes at a first lateral rate during an initial portion of travel of said selected pusher shoes across said conveying surface and at a second lateral rate during a subsequent portion of said travel, said first rate different from said second rate.

31. The method of claim 30 further including laterally displacing said selected pusher shoes at a third rate during a terminal portion of said travel, said third rate different from said second rate.

32. The method of claim 31 wherein said third lateral rate is greater than said second lateral rate.

33. The method of claim 31 wherein said first and third lateral rates are the same.

34. The method of claim 30 wherein said second lateral rate is less than said first lateral rate.

35. The method of claim 30 wherein said second lateral rate is greater than said first lateral rate.

36. The method of claim 35 further including transitioning the lateral speed of said selected pushers from said first lateral rate to said second lateral rate before said selected pushers are used to divert an article.

37. The method of claim 25 wherein said second selected diverter being upstream of said first selected diverter.

38. A diverting assembly for diverting articles from a conveying surface of a conveyor comprising:

a plurality of movable pushers associated with the conveying surface and adapted to be movable transversely across the conveying surface;

a plurality of diverting tracks configured to guide selected ones of said movable pushers across the conveying surface;

a plurality of diverters, each said diverter adapted to selectively divert at least one movable pusher to one of said diverting tracks when said diverter is activated into a diverting state; and

a controller adapted to activate into the diverting state, at least occasionally, at least two diverters from said plurality of diverters such that an article to be diverted on the conveying surface is initially diverted with a partial rotational motion and subsequently diverted without further rotational motion.

39. The diverting assembly of claim 38 wherein said controller is further adapted to activate, at least occasionally, only a single one of said diverters into the diverting state when an article is to be diverted.

40. The diverting assembly of claim 39 wherein said controller is further adapted to activate into the diverting state, at least occasionally, at least two diverters from said plurality of diverters such that an article to be diverted on the conveying surface is initially diverted without a rotational force.

41. The diverting assembly of claim 40 wherein said controller activates diverter into the diverting state at least based upon a length of the article to be diverted.

42. The diverting assembly of claim 38 wherein said plurality of diverting tracks includes at least four diverting tracks.

43. The diverting assembly of claim 42 wherein said at least four diverting tracks are parallel to each other for a majority of their lengths.

44. A method of diverting articles from a conveying surface of a conveyor, at least some of the articles being of different lengths, said method comprising:

providing a plurality of movable pushers associated with the conveying surface and adapted to be movable transversely across the conveying surface;

providing a plurality of diverting tracks configured to guide selected ones of said movable pushers across the conveying surface;

providing a plurality of diverters, each said diverter adapted to selectively divert at least one movable pusher along one of said diverting tracks when said diverter is activated into a diverting state;

determining a length of an article to be diverted;

activating at least two of said diverters into a diverting state at substantially the same time to divert an article if the length of the article to be diverted is less than a first length; and

activating at least two of said diverters into a diverting state at different times to divert an article if the length of the article to be diverted is greater than the first length.

45. The method of claim 44 further including activating only a single one of said diverters into a diverting state if the length of the article to be diverted is greater than a second length, said second length being greater than said first length.

46. The method of claim 44 wherein the activating of at least two diverters at different times comprises first activating a downstream diverter and subsequently activating a diverter that is upstream from the downstream diverter.

47. The method of claim 44 wherein said plurality of diverting tracks are oriented parallel to each other for a majority of their length.

48. The method of claim 44 wherein said plurality of diverting tracks merge together.