Tray handling system and process

• US 7,669,706 B2
• Filed: 12/09/2004
• Issued: 03/02/2010
• Est. Priority Date: 12/09/2004
• Status: Active Grant

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Morikawa, Hajime, McLaughlin, Jason G., Wisniewski, Michael A.
• Primary Examiner(s): Crawford; Gene
• Assistant Examiner(s): SINGH, KAVEL
• Application Number:
  US11/007,217
• Publication Number:
  US 20060124513A1
• Time in Patent Office: 1,909 Days
• Field of Search: 198/347.4, 198/349, 198/433, 198/447, 198/465.1
• US Class Current: 198/349
• CPC Class Codes: B07C 3/02 Apparatus characterised by the means used for distribution
• CPC Class Codes: Y10S 209/90 Sorting flat-type mail

Abstract

A device and method for sequencing trays includes a tray receiving conveyor and a recirculating conveyor. Trays are placed on the recirculating conveyor and merged with ejected trays into a multiple of sequenced trays at one or more merge locations. The system can include more than one merge location, with one of the merge locations providing a merge of trays into a contiguous sequence of trays.

Claims

1. A method of sequencing trays, comprising the steps of:

during at least one preliminary sweep operation;

directing newly ejected trays from queued bin locations to a first merge location;

diverting staged trays previously ejected from the queued bin locations towards the first merge location;

coordinating movements of the newly ejected trays and the staged trays such that the newly ejected trays are merged with the staged trays at the first merge location, into a sequenced set of trays; and

during a final sweep operation;

diverting the sequenced set of trays away from the first merge location and towards a second merge location;

ejecting remaining trays having product therein from working bin locations and the queued bin locations

diverting the remaining trays towards the second merge location; and

sequencing, in contiguous sequence, the remaining trays and sequenced trays as they pass though the second merge location.

2. The method of claim 1, further comprising providing a triggering event, to eject at different times, respectively, the newly ejected trays, the staged trays and the remaining trays into a flow path prior to the first merge location.

3. The method of claim 2, wherein the triggering event for ejecting the newly ejected trays and the staged trays is different than for ejecting the remaining trays.

4. The method of claim 1, further comprising the step of diverting some of the trays of the contiguous sequenced trays away from a feeder when the feeder is unable to process product with other trays of the contiguous sequenced trays and then leading the trays back to the feeder when the feeder regains the processing ability to process the product therein.

5. The method of claim 1, further comprising repeating the steps of claim 1 for a sequencing operation, and diverting the contiguous sequenced trays to an output.

6. The method of claim 1, further comprising placing product within the newly ejected trays and the staged trays.

7. The method of claim 6, wherein the product is mail pieces.