Conveying methods and apparatus

• US 5,950,800 A
• Filed: 07/17/1997
• Issued: 09/14/1999
• Est. Priority Date: 07/17/1997
• Status: Expired due to Term

• Current Assignee: Sandvik Sorting Systems, LLC
• Original Assignee: Sandvik Sorting Systems Inc.
• Inventors: Ydoate, Edward, Terrell, Jonathan Dean
• Primary Examiner(s): Bidwell, James R.
• Application Number:
  US08/895,925
• Time in Patent Office: 789 Days
• Field of Search: 198/443, 198/448, 198/452, 198/453, 198/460.1, 198/461.2
• US Class Current: 198/448
• CPC Class Codes: B65G 47/1492 the articles being fed from a feeding conveyor
• CPC Class Codes: B65G 47/68 adapted to receive articles arriving in one layer from one conveyor lane and to transfer them in individual layers to more than one conveyor lane or to one broader conveyor lane, or vice versa, e.g. combining the flows of articles conveyed by more than one conveyor
• CPC Class Codes: B65G 47/684 with recirculation of articles forming a buffer

Abstract

Articles are conveyed along a singulator conveyor system by being conveyed upwardly along an inclined first conveyor which is inclined at an angle of at least twenty-five degrees, so that any articles disposed atop other articles will fall off. The articles are discharged onto a second conveyor travelling horizontally at a linear speed at least twice that of the first conveyor in a direction substantially perpendicularly to a direction of travel of the first conveyor. The articles are then discharged from the second conveyor onto a third conveyor travelling generally horizontally at a linear speed at least twice that of the second conveyor in a direction substantially perpendicularly to the second conveyor. The articles are discharged from the third conveyor onto a slide which guides the articles downwardly onto a fourth conveyor which travels in the same direction as the third conveyor at the same speed as the third conveyor. The slide is transversely inclined toward an inner longitudinal edge of the fourth conveyor to guide articles downwardly toward that edge and into engagement with a vertical guide wall extending along that edge.

Claims

1. A conveying system comprising:

a driven inclined first conveyor oriented to convey articles upwardly at any angle of inclination of at least 25 degrees relative to horizontal;

a driven generally horizontal second conveyor arranged adjacent and below an upper end of the first conveyor for receiving articles from the first conveyor, the second conveyor traveling substantially perpendicularly to a direction of travel of the first conveyor as viewed in plan, the second conveyor traveling at a linear speed at least twice that of the first conveyor; and

a driven generally horizontal third conveyor disposed at a downstream end of the second conveyor at a lower elevation than the second conveyor for receiving articles therefrom, the third conveyor traveling substantially perpendicularly relative to the direction of travel of the second conveyor, the third conveyor traveling at a linear speed at least twice that of the second conveyor.

2. The conveying system according to claim 1 further including a fourth conveyor arranged substantially horizontally and oriented to convey articles in substantially the same direction as the third conveyor;

the fourth conveyor including an upstream end disposed adjacent to, and at a lower elevation than, a downstream end of the third conveyor, the fourth conveyor traveling at substantially the same linear speed as the third conveyor.

3. The conveying system according to claim 2, further including a vertical guide wall extending along a longitudinal edge of the fourth conveyor, a stationary slide extending longitudinally downwardly from the third conveyor to the fourth conveyor, and transversely downwardly toward the vertical wall to guide articles toward and against the vertical wall.

4. The conveying system according to claim 1 wherein a conveying surface of the first conveyor has a higher coefficient of friction than a conveying surface of the second conveyor.

5. The conveying system according to claim 2 wherein the first, second, third, and fourth conveyors comprise endless belt conveyors.

6. The conveying system according to claim 1 wherein the angle of inclination of the first conveyor is about 30 degrees.

7. The conveying system according to claim 1, further including a downwardly inclined stationary first slide positioned for guiding articles traveling from the first conveyor to the second conveyor.

8. The conveying system according to claim 7, further including a downwardly inclined stationary second slide positioned for guiding articles traveling from the second conveyor to the third conveyor.

9. A method of conveying articles comprising the steps of:

A) conveying articles upwardly on a driven inclined first conveyor at an angle of at least 25 degrees, so that any articles disposed atop other articles will fall off;

B) discharging the articles from an upper end of the first conveyor downwardly onto a second conveyor traveling generally horizontally at a linear speed at least twice that of the first conveyor in a direction substantially perpendicularly to a direction of travel of the first conveyor, as viewed in plan, whereby the articles tend to become aligned in single file on the second conveyor; and

C) discharging the articles from a downstream end of the second conveyor downwardly onto an upstream end of a third conveyor traveling generally horizontally at a linear speed at least twice that of the second conveyor in a direction substantially perpendicular to the direction of travel of the second conveyor as viewed in plan.

10. The method according to claim 9 further including a step D of discharging the articles from a downstream end of the second conveyor downwardly onto an upstream end of a third conveyor traveling generally horizontally at substantially the same linear speed as the third conveyor in substantially the same direction as the third conveyor.

11. The method according to claim 10, wherein step D comprises guiding articles from the third conveyor to the fourth conveyor along a slide which is longitudinally and transversely inclined to guide articles toward a vertical wall extending along one longitudinal edge of the fourth conveyor.

12. The method according to claim 9 wherein step A comprises conveying articles on the first conveyor which has a conveying surface with a higher coefficient of friction than the second conveyor.

13. The method according to claim 9 wherein step B comprises guiding articles along a downwardly inclined stationary first slide from the first conveyor to the second conveyor.

14. The method according to claim 12 wherein step C comprises guiding articles along a downwardly inclined stationary second slide from the second conveyor to the third conveyor.

15. A method of conveying articles comprising the steps of:

A) introducing articles onto an upstream conveyor traveling in a generally horizontal direction, the articles being introduced adjacent an inner longitudinal edge of the upstream conveyor in a direction substantially perpendicular to the direction of travel of the upstream conveyor, as viewed in plan;

B) driving the upstream conveyor at a linear speed at least twice that of the speed of articles introduced onto the upstream conveyor;

C) discharging the articles onto a slide extending downwardly from a downstream end of the upstream conveyor to an upstream end of a downstream conveyor, the slide being transversely inclined toward an inner longitudinal edge of the downstream conveyor;

D) guiding the articles along the slide and into contact with a vertical wall extending along the inner longitudinal edge of the downstream conveyor; and

E) driving the downstream conveyor at substantially the same linear speed as the upstream conveyor.