High volume conveyor sortation system

• US 8,060,245 B2
• Filed: 12/07/2006
• Issued: 11/15/2011
• Est. Priority Date: 12/07/2005
• Status: Active Grant

• Current Assignee: Dematic Corporation
• Original Assignee: Dematic Corporation
• Inventors: Kane, Kenneth D, Lupton, Clinton R, Butler, Phillip C
• Primary Examiner(s): BURGESS, RAMYA PRAKASAM
• Application Number:
  US11/567,777
• Publication Number:
  US 20070129843A1
• Time in Patent Office: 1,804 Days
• Field of Search: 700/230, 198/347.4, 198/419.5, 198/460.3, 198/462.1, 198/575, 198/577
• US Class Current: 700/230
• CPC Class Codes: B07C 5/36 Sorting apparatus characterised by the means used for distribution sorting according to destination B07C3/003, B07C3/02
• CPC Class Codes: B65G 37/02 Flow-sheets for conveyor combinations in warehouses, magazines or workshops
• CPC Class Codes: B65G 43/10 Sequence control of conveyors operating in combination
• CPC Class Codes: B65G 47/52 Devices for transferring articles or materials between conveyors i.e. discharging or feeding devices loading or unloading by means not incorporated in, or not operatively associated with, conveyors B65G65/00; transfer of workpieces during metal rolling B21B41/00
• CPC Class Codes: B65G 47/70 with precedence controls among incoming article flows

Abstract

A sortation system and method of sorting product includes providing a sorter assembly and a supply system supplying product that is received by the sorter assembly. Product supplied to the sorter assembly is monitored and a parameter is determined that is indicative of the relationship between product supplied to the sorter assembly and product being sorted by the sorter assembly. The supply system is controlled as a function of a value of the parameter.

Claims

1. A sortation system, comprising:

a sorter assembly, said sorter assembly receiving product and sorting that product to a plurality of sortation lines;

a supply system made up of a plurality of conveyors and a merge assembly, wherein said merge assembly supplies product to said conveyors and said conveyors supply product to said sorter assembly; and

a control system, said control system monitoring product supplied to the sorter assembly and determining a parameter, said parameter indicative of an excess of product supplied to said sorter assembly with respect to product being sorted by said sorter assembly;

said control system controlling a speed of said conveyors as a function of a value of the parameter in order to maintain a balance between a rate of supply of product by said supply system and a rate at which product are sorted by said sorter assembly by reducing the speed of said conveyors in response to an increase in said parameter and by increasing the speed of said conveyors in response to a decrease in said parameter.

2. The sortation system as claimed in claim 1 wherein said sorter assembly includes an accumulator, said accumulator accumulating an excess of product supplied to said sorter assembly than product being sorted by said sorter assembly, wherein said control system monitors product accumulated at said accumulator and determines a value of said parameter as a function of the product accumulated at said accumulator.

3. The sortation system as claimed in claim 2 including a plurality of product detectors spaced along said accumulator, said control system determining a value of said parameter as a function of which of said product detectors are detecting product.

4. The sortation system as claimed in claim 3 wherein said control system controls operation of said accumulator to accumulate product as a function of which of said product detectors are detecting product.

5. The sortation system as claimed in claim 3 wherein said control system modifies the value of said parameter in response to particular ones of said product sensors detecting product in a sequential order.

6. The sortation system as claimed in claim 5 wherein said control system modifies the value of said parameter in response to said particular ones of said product sensors not detecting product in a decreasing sequential order.

7. The sortation system as claimed in claim 2 including at least one product detector at said accumulator, said control system determining a value of said parameter as a function of an amount of time, said at least one product detector is detecting product.

8. The sortation system as claimed in claim 2 including another accumulator, said another accumulator being downstream of said accumulator in a direction of product flow, said control monitoring product accumulated at said another accumulator and determines a value of said parameter as a function of the product accumulated at said another accumulator.

14. The sortation system as claimed in claim 1 wherein said control system includes a position transducer, said position transducer monitoring movement of product on said conveyors.

15. The sortation system as claimed in claim 1 wherein said conveyors are driven by at least one chosen from variable frequency motors and servo controlled motors.

16. The sortation system as claimed in claim 1 wherein said control system determines the value of said parameter from at least one chosen from an algorithm and a look-up table.

9. A sortation system, comprising:

a sorter assembly, said sorter assembly receiving product and sorting that product to a plurality of sortation lines;

a supply system made up of a plurality of conveyors, said supply system supplying product that is received by said sorter assembly; and

a control system, said control system monitoring product supplied to the sorter assembly and determining a parameter, said parameter indicative of an excess of product supplied to said sorter assembly with respect to product being sorted by said sorter assembly;

said control system controlling said supply system as a function of a value of the parameter by decreasing the supply of product supplied by said supply system in response to an increase in said parameter and by increasing the supply of product supplied by said supply system in response to a decrease in said parameter; and

wherein said sorter assembly includes a product induct, said product induct adjusting an actual product gap between product being sorted by said sorter assembly wherein said control system determines a value of said parameter as a function of operation of said product induct.

10. The sortation system as claimed in claim 9 wherein said control system determines a value of said parameter as a function of a difference between the actual product gap and an ideal product gap.

11. The sortation system as claimed in claim 9 wherein said supply system comprises a plurality of feed lines and a merge assembly, each of said supply feed lines selectively discharging product to said merge assembly and said merge assembly supplying product to said conveyors.

12. The sortation system as claimed in claim 11 wherein said feed lines comprise slug-building lines and wherein each of said slug-building lines combine individual product into product slugs.

13. The sortation system as claimed in claim 11 wherein said control system controls a speed of said merge assembly as a function of the value of said parameter.

20. The sortation system as claimed in claim 9 wherein said control system determines a value of said parameter as a function of a speed of said product induct.

17. A sortation system, comprising:

a sorter, said sorter receiving product and sorting that product to a plurality of sortation lines;

an accumulator supplying product to said sorter, said accumulator accumulating an excess of product supplied to said accumulator with respect to product supplied to said sorter;

a supply system made up of a plurality of conveyors, said supply system supplying product to said accumulator; and

a control system, said control system monitoring product accumulated with said accumulator and adjusting a rate of product supplied with said supply system as a function of fullness of said accumulator with product, wherein said control system decreases the supply of product supplied with said supply system in response to an increase in the fullness of said accumulator and increases the supply of product supplied with said supply system in response to a decrease in the fullness of said accumulator.

18. A method of sorting product comprising:

providing a sorter assembly, receiving product with said sorter assembly and sorting that product to a plurality of sortation lines;

providing a supply system made up of a plurality of conveyors and a merge assembly, and supplying product from said merge assembly to said conveyors and from said conveyors to said sorter assembly; and

monitoring product supplied to the sorter assembly and determining a parameter, said parameter indicative of an excess of product supplied to said sorter assembly with respect to product being sorted by said sorter assembly; and

controlling a speed of said conveyors as a function of a value of said parameter in order to maintain a balance between a rate of supply of articles by said supply system and a rate at which articles are sorted by said sorter assembly by reducing the speed of said conveyors in response to an increase in said parameter and by increasing the speed of said conveyors in response to a decrease in said parameter.

19. A method of sorting product comprising:

providing a sorter, receiving product with said sorter and sorting that product to a plurality of sortation lines;

providing an accumulator supplying product to said sorter, accumulating with said accumulator an excess of product supplied to said accumulator with respect to product supplied to said sorter;

providing a supply system made up of a plurality of conveyors, supplying product with said supply system to said accumulator; and

monitoring product accumulated with said accumulator and adjusting a rate of product supplied with said supply system as a function of fullness of said accumulator with product including decreasing the supply of product supplied with said supply system in response to an increase in fullness of said accumulator and increasing the supply of product supplied with said supply system in response to a decrease in fullness of said accumulator.