Apparatus and methods for controlling spacing of conveyed objects

• US 7,537,105 B2
• Filed: 05/16/2007
• Issued: 05/26/2009
• Est. Priority Date: 08/15/2005
• Status: Active Grant

• Current Assignee: Laitram LLC
• Original Assignee: Laitram LLC
• Inventors: Fourney, Matthew L.
• Primary Examiner(s): Hess; Douglas A
• Application Number:
  US11/749,582
• Publication Number:
  US 20070209909A1
• Time in Patent Office: 741 Days
• Field of Search: 198/717, 198/731, 198/728, 198/732, 198/817
• US Class Current: 198/732
• 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 47/28 during transit by a single conveyor
• CPC Class Codes: B65G 47/841 Devices having endless travelling belts or chains equipped with article-engaging elements

Abstract

In one embodiment, apparatus for controlling spacing of objects conveyed by an object conveyor include flights that can be actuated from a retracted state to an extended state in which the flights extend transversely across the object conveyor, the flights limiting travel of the objects to control their relative spacing, wherein the flights actuate with relatively little force such that a retracted flight will not extend once it contacts a directly adjacent object that occupies space into which the retracted flight would normally extend.

Claims

1. Apparatus for controlling spacing of objects conveyed by an object conveyor traveling at a first linear speed, the apparatus comprising:

flights that can be actuated from a retracted state to an extended state in which the flights extend transversely across the object conveyor and travel at a second linear speed slower than the first linear speed, the flights limiting travel of the objects to control their relative spacing, wherein the flights actuate with relatively little force such that a retracted flight will not extend once it contacts a directly adjacent object that occupies space into which the retracted flight would normally extend.

2. The apparatus of claim 1, further comprising a conveyor belt to which the flights are mounted and wherein the flights are substantially parallel to the conveyor belt in the retracted state and substantially perpendicular to the conveyor belt in the extended state.

3. The apparatus of claim 2, wherein the conveyor belt is vertically oriented such that an outer surface of the conveyor belt lies within a vertical plane.

4. The apparatus of claim 3, wherein the conveyor belt is positioned adjacent a lateral edge of the object conveyor.

5. The apparatus of claim 2, further comprising an actuation mechanism adapted to actuate the flights when they are positioned adjacent the object conveyor.

6. The apparatus of claim 5, wherein the actuation mechanism comprises a plate member that the flights contact during actuation.

7. The apparatus of claim 2, further comprising a retraction mechanism that at least maintains the flights in the retracted state.

8. The apparatus of claim 7, wherein the retraction mechanism also retracts the flights.

9. The apparatus of claim 8, wherein the retraction mechanism comprises a rail that forces the flights into the retracted state.

10. The apparatus of claim 2, wherein the conveyor belt is horizontally oriented and positioned above the object conveyor such that the flights drop downward when actuated and interface with top portions of the objects to limit their travel.

11. The apparatus of claim 10, wherein the flights are actuated at least in part by gravity.

12. The apparatus of claim 1, wherein the flights comprise a cam surface used to actuate the flight and a stop member used to limit travel of the objects.

13. The apparatus of claim 12, wherein the cam surface comprises a curved surface that interfaces with a contact surface of an actuation mechanism and wherein the stop member comprises a substantially flat working surface that interfaces with the objects.

14. Apparatus for controlling spacing of objects conveyed by an object conveyor traveling at a first linear speed, the apparatus comprising:

a belt traveling at a second linear speed slower than the first linear speed and including a plurality of flights that can be actuated from a retracted state in which the flights are substantially parallel to the belt to an extended state in which the flights are substantially perpendicular to the belt, the flights being adapted to limit travel of the objects to control their relative spacing along a length direction of the object conveyor;

an actuation mechanism adapted to actuate the flights when they approach the object conveyor to transition the flights from the retracted state to the extended state, the actuation mechanism being adapted to actuate the flights with relatively little force such that a retracted flight will not extend once it contacts a directly adjacent object that occupies space into which the retracted flight would normally extend; and

a retraction mechanism at least adapted to maintain the flights in the retracted state until the flights are intended to be actuated and placed in the extended state.

15. The apparatus of claim 14, wherein the belt is vertically oriented such that an outer surface of the conveyor belt lies within a vertical plane.

16. The apparatus of claim 14, wherein the actuation mechanism comprises a plate member that the flights contact during actuation.

17. The apparatus of claim 16, wherein at least one of the flights comprises a cam surface that interfaces with a surface of the plate member and where friction between the cam surface and the plate member surface pivotally rotates the flight into the extended state.

18. The apparatus of claim 14, wherein the retraction mechanism is also adapted to retract the flights.

19. The apparatus of claim 18, wherein the retraction mechanism comprises a rail that forces the flights into the retracted state.

20. The apparatus of claim 14, wherein the conveyor belt is horizontally oriented and positioned above the object conveyor such that the flights drop downward when actuated and interface with top portions of the objects to limit their travel.

21. The apparatus of claim 19, wherein the flights are actuated at least in part by gravity.

22. A method for controlling spacing of objects provided on an object conveyor that conveys the objects at a first linear speed, the method comprising:

operating a belt adjacent the object conveyor at a second linear speed that is slower than the first linear speed, the belt comprising a plurality of flights adapted to limit travel of the objects;

extending individual flights when they are positioned alongside the object conveyor such that they transition from a retracted state in which the flights are substantially parallel to the belt to an extended state in which the flights are substantially perpendicular to the belt;

limiting travel of individual objects conveyed by the object conveyor with the extended flights;

not extending a retracted flight that contacts a directly adjacent object that occupies space into which the retracted flight would normally extend; and

retracting the extended flights after they have been used to limit the travel of an object.