Systems and methods for loading items into a tray

Patent metadata

Field	Value
Publication number	US-10894686-B2
Application number	US-201916548049-A
Country	US
Kind code	B2
Filing date	Aug 22, 2019
Priority date	May 12, 2015
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

Features for systems and methods for loading items into a tray are disclosed. The system may have an item conveyor configured to move the items towards a tray conveyor. The tray conveyor may be configured to move trays to receive items from the item conveyor into the tray. One or more sensors may detect the height of the items on the item conveyor and/or in the tray, and/or the position of the trays on the tray conveyor. A controller may receive data related to the one or more detected heights of the items and/or the position of the trays on the tray conveyor and correspondingly control movement of the item and/or tray conveyors for efficient loading of items into the tray and efficient movement of the trays for further processing. Tray conveyor movement sensors may detect movement of the trays or tray conveyors for further control or reliability of the system.

First claim

What is claimed is:

1. A method of loading a tray comprising:
moving a plurality of items in a first direction on an item conveyor;
moving, on a tray conveyor, a first tray of a plurality of trays in a second direction to a loading position;
detecting, via an item sensor, height profile information for the plurality of items on the item conveyor;
identifying one or more peaks in the height profile information;
determine the height of the one or more identified peaks;
injecting one or more of the plurality of items into the first tray of the plurality of trays on the tray conveyor;
determining, via a processor, based on the determined height of the one or more identified peaks, whether the one or more items injected into the first tray will exceed a threshold height in the first tray;
moving, based on the determination, the first tray in the second direction out of the loading position; and
moving, based on the determination, a second tray of the plurality of trays into the loading position.

2. The method of claim 1 , further comprising detecting, via a tray detection sensor, the presence of the second tray and injecting one or more of the plurality of items into the second tray when it is detected in the loading position.

3. The method of claim 1 , wherein moving the first tray to the loading position comprises, detecting, via a tray detection sensor, the presence of the first tray in the loading position.

4. The method claim 1 , further comprising determining an incremental distance based on the based on the determined height of the one or more identified peaks, and moving the tray conveyor the incremental distance in the second direction.

5. The method of claim 1 , further comprising determining, via a tray height sensor, a height within the first tray of the one or more of the plurality of items which have been injected into the first tray.

6. The method of claim 5 , wherein moving the first tray in the second direction out of the loading position is further based on the determination of the height within the tray of the one or more of the plurality of items which have been injected into the first tray.

7. The method of claim 1 , wherein moving the plurality of items in the first direction on the item conveyor comprises:
moving the plurality of items in the first direction on a first section of the item conveyor at a first speed; and
moving the plurality of items in the first direction on a second section of the item conveyor at a second speed that is greater than the first speed.

8. A method of loading a tray comprising:
moving a plurality of items in a first direction on an item conveyor;
moving, on a tray conveyor, a first tray of a plurality of trays in a second direction to a loading position;
moving a guide paddle at least partially into the first tray;
injecting one or more of the plurality of items toward the first tray of the plurality of trays on the tray conveyor;
deflecting the one or more of the plurality of items off the guide paddle so as to guide the items into the first tray;
detecting, via a tray height sensor, a height of one or more of the plurality of items injected into the first tray by passing a transmission from the tray height sensor through an opening formed in the guide paddle to reach one or more of the plurality of items received in the first tray when the guide paddle is extended at least partially into the first tray;
determining, in a processor, that the height of the items in the tray meets or exceeds a threshold height; and
moving the guide paddle out of the tray in response to determining that the height of the items in the tray meets or exceeds a threshold height.

9. The method of claim 8 , further comprising moving the first tray in the second direction, and moving a second tray of the plurality of trays in the second direction to a loading position.

10. The method of claim 8 , further comprising measuring, via an item sensor, a height of one or more of the plurality of items on the item conveyor.

11. The method of claim 10 , further comprising determining, via a processor, a height of items within the tray based on the measured height of the one or more of the plurality of items on the item conveyor.

12. The method of claim 10 , wherein determining, in a processor, that the height of the items in the tray meets or exceeds a threshold height is further based on the measuring of the height of the one or more of the plurality of items on the item conveyor.

13. A tray loading system comprising:
an item conveyor extending in a first direction toward a first end and configured to move a plurality of items along the item conveyor in the first direction to inject one or more of the plurality of items into a first tray of a plurality of trays, wherein the one or more of the plurality of items are in a shingled arrangement on the item conveyor;
an item sensor positioned above the item conveyor configured to measure a distance between the sensor and a top surface of one or more of the plurality of items on the item conveyor;
a processor configured to:
receive distance data from the item sensor, wherein the distance data comprises continuous readings of the detected the distance from the sensor to the top surface of one of the plurality of items which is under the sensor;
identify one or more peaks in the distance data;
determine the height of the one or more identified peaks;
generate an incremental distance measurement based on the determined height of the one or more identified peaks;
associate the incremental distance with the one of the plurality of items on the item conveyor;
determine the height of the one or more of the plurality of items on the item conveyor; and
control the movement of the item conveyor based on the determined height.

14. The system of claim 13 , wherein the processor is further configured to determine a height of items in the second tray based on a sum of the generated incremental distance measurements for the plurality of items on the item conveyor.

15. A tray loading system comprising:
an item conveyor extending in a first direction toward a first end and configured to move a plurality of items along the item conveyor in the first direction to inject one or more of the plurality of items into a first tray of a plurality of trays, wherein the one or more of the plurality of items are in a shingled arrangement on the item conveyor;
an item sensor positioned above the item conveyor configured to measure a distance between the sensor and a top surface of one or more of the plurality of items on the item conveyor;
a processor configured to:
receive distance data from the item sensor, wherein the distance data comprises continuous readings of the detected the distance from the sensor to the top surface of one of the plurality of items which is under the sensor;
identify one or more peaks in the distance data;
correlate each peak to one of the plurality of items on the item conveyor; and
generate a count of items passing the sensor based on the correlated peaks.

16. The system of claim 15 , wherein the processor is further configured to:
receive an item thickness for each of the plurality of items on the item conveyor from an item database; and
determine a height of items in the first tray by multiplying the received item thickness for each of the plurality of items with the generated count of items.

Assignees

• United States Postal Service

Inventors

• Yang Dongliang
• Yang Shao C
• Simpson Christopher R
• Goodbar Iii James E
• Khazanov Marina E
• Coupar George

Classifications

• B65G65/00 Primary

  Loading or unloading (of vehicles B65G67/00) · CPC title

• B65H2301/16

  of discharge in bins, stacking, collating or gathering · CPC title

• B65B43/54

  Means for supporting containers or receptacles during the filling operation · CPC title

• B65G2201/0285

  Postal items, e.g. letters, parcels · CPC title

• B65H31/08

  the articles being piled one above another · CPC title