Mail sorter system and method for productivity optimization through precision scheduling

• US 7,937,184 B2
• Filed: 10/06/2006
• Issued: 05/03/2011
• Est. Priority Date: 10/06/2006
• Status: Active Grant

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Stemmle, Denis J.
• Primary Examiner(s): Crawford; Gene
• Assistant Examiner(s): BURGESS, RAMYA PRAKASAM
• Application Number:
  US11/544,349
• Publication Number:
  US 20080086232A1
• Time in Patent Office: 1,670 Days
• Field of Search: 700/223, 700/224, 209/584, 209/583
• US Class Current: 700/223
• CPC Class Codes: B07C 3/00 Sorting according to destination collating the pages of a book B42C1/00

Abstract

A mail sorting system, method, and software product are provided for transitioning from an earlier phase to a later phase of mail sortation. Information acquired during the earlier phase is used in order to calculate, while continuing the earlier phase, a transition time. At the transition time, there would be sufficient remaining time to perform the later phase, in order to meet a deadline for completing the later phase.

Claims

1. A method for transitioning from an earlier phase to a later phase of mail sortation, comprising:

performing the earlier phase of mail sortation, before the later phase;

acquiring information during the earlier phase comprising at least a total number of pitches occupied by the mail to be sorted in the later phase known after the earlier phase is halted; and

using the information in order to calculate, while continuing the earlier phase, a transition time at which there would be sufficient remaining time to perform the later phase prior to a deadline for completing the later phase,

wherein using the information to calculate the transition time is repeated in order to calculate, before the earlier phase is stopped, a revised value of the transition time.

2. The method of claim 1,

wherein an increasing number of mail pieces enter the earlier phase of mail sortation as time goes by, before the earlier phase is stopped;

and,

wherein the revised value is larger than an unrevised value of the transition time.

3. The method of claim 2,

wherein the information used to calculate the transition time comprises the number of mail pieces and at least one characteristic of at least one of the mail pieces that have entered the earlier phase.

4. The method of claim 1, further comprising determining whether the earlier phase should be stopped, based at least partly on a difference between the transition time and current actual time.

5. The method of claim 4,

wherein it is determined to stop the earlier phase if the difference is less than a threshold.

6. The method of claim 1,

wherein the later phase of mail sortation includes loading the mail pieces into mail trays.

7. The method of claim 1,

wherein the earlier phase of mail sortation comprises sortation to a first set of batches,

wherein the later phase of mail sortation comprises sortation to a second set of batches, and

wherein each of the first set of batches is larger than each of the second set of batches.

8. The method of claim 7, wherein the later phase of mail sortation further comprises sortation to delivery sequence.

9. The method of claim 1,

wherein calculation of the transition time comprises:

calculating an expected duration for performing the later phase; and

, subtracting the expected duration from the deadline.

10. The method of claim 1,

wherein the earlier phase comprises loading mail pieces into a sorter and sorting the mail pieces into a first set of batches;

and,

wherein the later phase comprises sorting the first set of batches into smaller batches.

11. The method of claim 10,

wherein the later phase further comprises sorting the smaller batches to delivery sequence.

12. The method of claim 1 further comprising recording the information about the mail pieces during the earlier phase.

13. The method of claim 1,

wherein the earlier phase includes sorting the mail pieces in a first pass, to a first degree of sortation;

wherein the later phase includes sorting the mail pieces in a second pass, to a second degree of sortation;

wherein calculating the transition time includes calculating a time period required to complete the second pass, based at least partly on the information recorded about the mail pieces during the first pass; and

wherein the method further comprises using the transition time to display a specific start time at which the second pass must commence in order to meet the deadline.

14. The method of claim 13,

wherein the information includes at least one of the following:

a number of the mail pieces, a dimension of at least one of the mail pieces, a thickness of at least one of the mail pieces, and a destination of at least one of the mail pieces.

15. The method of claim 13, further including alerting an operator substantially at the specific start time.

16. The method of claim 13,

wherein the first pass comprises moving the mail pieces into the at least one mail sorter, and

wherein the second pass comprises moving the mail pieces out of the one or more mail sorter.

17. The method of claim 13,

wherein the at least one mail sorter is identical to the one or more mail sorter;

and

wherein the earlier phase is preceded by another phase of mail sortation.

18. The method of claim 1, wherein information further includes:

total number of mail pieces to be sorted;

type of mail pieces; and

speed of feeders used for the type of mail.

19. The method of claim 1, further comprising calculating a time to complete the later phase, the calculating comprising:

[Sorter Path Length+(Total Pitches Occupied)(Efficiency Factor)]/[Transport Speed].

20. The method of claim 1, wherein the revised value of the transition time is continuously updated, changing to an earlier time as additional mail pieces are loaded in during the earlier phase.

21. The method of claim 1, wherein the information is used to calculate a time for completion of the later phase, which is subtracted from a dispatch deadline to a current required start time for stating the transition from the earlier phase to the later phase.

22. The method of claim 21, wherein:

if the current required start time is substantially later than an actual time, then sorting in the earlier phase continues; and

if the current required start time is not substantially later than an actual time, then sorting in the earlier phase stops and the later phase begins.

23. A mail sorting system, comprising:

a first set of sorting equipment, configured to perform an earlier phase of mail sortation;

a second set of sorting equipment, configured to perform a later phase of mail sortation, wherein the earlier phase occurs before a transition to the later phase;

at least one information acquisition device, configured to acquire information during the earlier phase comprising at least a total number of pitches occupied by the mail to be sorted in the later phase known after the earlier phase is halted; and

at least one processing module, configured to use the information to calculate, while the earlier phase is continuing, a transition time for the transition,

wherein, at the transition time, there is sufficient remaining time to perform the later phase prior to a deadline for completing the later phase, and

wherein the processing module is further configured to use the information repeatedly, in order to calculate a revised value of the transition time, before the earlier phase is stopped.

24. The mail sorting system of claim 23,

wherein the mail sorting system is a single mail sorter, and

wherein the first set of sorting equipment and the second set of sorting equipment have at least some equipment in common.

25. The mail sorting system of claim 23,

wherein the processing module is further configured to determine whether the earlier phase should be stopped, based at least partly on a difference between the transition time and current actual time.

26. The mail sorting system of claim 25, further including an alert module configured to alert an operator substantially when it is determined that the earlier phase should be stopped.

27. The mail sorting system of claim 23,

wherein the earlier phase of mail sortation includes sortation to a first set of batches;

wherein the later phase of mail sortation comprises sortation to a second set of batches; and

wherein each of the first set of batches is larger than each of the second set of batches.

28. The mail sorting system of claim 27, wherein the later phase of mail sortation further comprise sortation to delivery sequence.

29. The mail sorting system of claim 23,

wherein the first set of sorting equipment comprises a mail loading device configured to move the mail pieces into the mail sorting system, and

wherein the second set of sorting equipment comprises a tray loading device configured to move the mail pieces out of the mail sorting system.

30. The mail sorting system of claim 23, wherein information includes:

total number of mail pieces to be sorted;

type of mail pieces; and

speed of feeders used for the type of mail.

31. The mail sorting system of claim 23, wherein:

the at least one processing module further calculates a time to complete the later phase, the calculating comprising;

[Sorter Path Length+(Total Pitches Occupied)(Efficiency Factor)]/[Transport Speed];

the revised value of the transition time is continuously updated, changing to an earlier time as additional mail pieces are loaded in during the earlier phase;

the information is used to calculate a time for completion of the later phase, which is subtracted from a dispatch deadline to a current required start time for stating the transition from the earlier phase to the later phase; and

if the current required start time is substantially later than an actual time, then sorting in the earlier phase continues; and

if the current required start time is not substantially later than an actual time, then sorting in the earlier phase stops and the later phase begins.