SYSTEMS AND METHODS FOR LOADING ITEMS INTO A TRAY

• US 20160332823A1
• Filed: 04/29/2016
• Published: 11/17/2016
• Est. Priority Date: 05/12/2015
• Status: Active Grant

• Current Assignee: United States Postal Service (Government of the United States of America)
• Original Assignee: United States Postal Service (Government of the United States of America)
• Inventors: Yang, Shao C., Simpson, Christopher R., Khazanov, Marina E., Coupar, George, Yang, Dongliang, Goodbar, James E.
• Granted Patent: US 9,840,379 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B65B 43/54 Means for supporting containers or receptacles during the filling operation
• CPC Class Codes: B65G 2201/0285 Postal items, e.g. letters, parcels
• CPC Class Codes: B65G 65/00 Loading or unloading of vehicles B65G67/00
• CPC Class Codes: B65H 2301/16 of discharge in bins, stacking, collating or gathering
• CPC Class Codes: B65H 2301/42264 by moving the surface supporting the lowermost article of the pile, e.g. conveyor, carriage
• CPC Class Codes: B65H 31/08 the articles being piled one above another
• CPC Class Codes: B65H 33/16 by depositing articles in batches on moving supports

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.

Claims

1. A system for loading items into a tray, the 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 toward the first end and to inject into a tray one or more of the plurality of items from the first end of the item conveyor;

a tray conveyor extending generally downward in a second direction that intersects the first direction near the first end of the item conveyor, the tray conveyor configured to move a tray downward on the tray conveyor in the second direction, wherein the tray is configured to receive one or more of the plurality of items injected from the item conveyor;

a sensor configured to detect a height of at least one of the plurality of items; and

a controller communicatingly coupled with the item conveyor, the tray conveyor and the sensor, wherein the controller is configured to control movement of the item and the tray conveyors based on the height of at least one of the plurality of items detected by the sensor.

2. The system of claim 1, wherein the sensor is positioned above the item conveyor and is configured to detect a height of at least one of the plurality of items on the item conveyor.

3. The system of claim 1, wherein the sensor is positioned above the tray conveyor and is configured to detect a height of at least one of the plurality of items in the tray.

4. The system of claim 1, wherein the sensor is positioned above the item conveyor and is configured to detect a height of at least one of the plurality of items on the item conveyor, and further comprising a second sensor positioned above the tray conveyor and configured to detect a height of at least one of the plurality of items in the tray.

5. The system of claim 4, wherein the controller is further configured to move the tray conveyor based on the detected height of at least one of the items received in the tray.

6. The system of claim 5, wherein the controller is further configured to move the tray conveyor a first amount for a detected increase in height of at least one of the items received in the tray.

7. The system of claim 6, wherein the detected increase in height of the items received in the tray is a cumulative height based on one or more individual measurements of height of at least one of the items in the tray.

8. The system of claim 5, further comprising a first detector coupled with the tray conveyor and configured to sense the presence of the tray on the tray conveyor in a starting position.

9. The system of claim 8, further comprising a second detector coupled with the tray conveyor at an ending position that is upstream from the starting position and configured to sense the absence of the tray from the ending position.

10. The system of claim 9, wherein the controller is further configured to control the movement of the tray conveyor based on the sensed presence and absence of the tray on the tray conveyor in the starting and ending positions, respectively.

11. The system of claim 10, wherein the first detector senses the presence of a forward portion of the tray at the starting position, and the second detector senses the absence of a rearward portion of the tray at the ending position.

12. The system of claim 10, wherein the controller is configured to move the tray conveyor based on the sensed presence and absence of the tray on the tray conveyor in the starting and ending positions such that a second tray is moved on the tray conveyor in the second direction to the starting position to begin receiving additional items injected from the item conveyor.

13. The system of claim 12, wherein the first detector senses the presence of the second tray at the starting position.

14. The system of claim 12, further comprising a guide paddle coupled with the controller and positioned generally over the tray conveyor, wherein the controller is further configured to move the guide paddle at least partially into the tray based on the sensed presence of the tray and based on the detected height of at least one of the items received in the tray such that the one or more of the plurality of items injected from the item conveyor deflects off the guide paddle and falls into the tray.

15. The system of claim 14, wherein the controller is further configured to extend the guide paddle at least partially into the tray based on the sensed presence of the tray at the starting position, to maintain the position of the guide paddle therein based on the detected height of at least one of the items received in the tray being less than a full height, and to retract the guide paddle out of the tray based on the detected height of at least one of the items received in the tray being greater than or equal to the full height.

16. The system of claim 2, wherein the sensor is configured to sense the height of at least one of the plurality of items in a shingled arrangement on the item conveyor, and wherein the item conveyor is configured to inject the one or more of the plurality of items in the shingled arrangement from the item conveyor.

17. The system of claim 1, the item conveyor having a first section configured to move the plurality of items at a first speed and a second section configured to move the plurality of items at a second speed that is greater than the first speed.

18. A method of receiving items in a tray, the method comprising:

moving a plurality of items in a first direction on an item conveyor toward a first end of the item conveyor;

injecting one or more of the plurality of items from the item conveyor into a tray on a tray conveyor;

detecting a height of at least one of the plurality of items; and

moving, based on the detected height of at least one of the plurality of items, the tray downward on the tray conveyor in a second direction that intersects the first direction near the first end of the item conveyor.

19. The method of claim 18, wherein detecting the height of at least one of the plurality of items comprises detecting the height of at least one of the plurality of items on the item conveyor, wherein moving the items on the item conveyor, injecting the items from the item conveyor, and moving the tray on the tray conveyor are based on the detected height of at least one of the items on the item conveyor.

20. The method of claim 18, wherein detecting the height of at least one of the plurality of items comprises detecting the height of at least one of the plurality of items in the tray on the tray conveyor, wherein moving the items on the item conveyor, injecting the items from the item conveyor, and moving the tray on the tray conveyor are based on the detected height of at least one of the items in the tray on the tray conveyor.

21. The method of claim 18, wherein detecting the height of at least one of the plurality of items comprises:

detecting the height of at least one of the plurality of items on the item conveyor; and

detecting the height of at least one of the plurality of items in the tray on the tray conveyor,

wherein moving the items on the item conveyor, injecting the items from the item conveyor, and moving the tray on the tray conveyor are based on the detected height of at least one of the items on the item conveyor and on the detected height of at least one of the items in the tray.

22. The method of claim 18, further comprising sensing the presence or absence of the tray in a starting position.

23. The method claim 21, further comprising moving the tray conveyor a first amount based on detecting the height of at least one of the plurality of items in the tray to be greater than a threshold amount.

24. The method of claim 18, 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.

25. The method of claim 24, wherein injecting the one or more of the plurality of items from the item conveyor into the tray comprises injecting the one or more of the plurality of items from the item conveyor into the tray at the second speed.

26. A system for loading items into a tray, the system comprising:

means for moving a plurality of items in a first direction toward a first end of the means for moving the plurality of items;

means for moving a tray downward in a second direction that intersects the first direction near the first end of the means for moving the plurality of items;

means for injecting one or more of the plurality of items from the means for moving the plurality of items into the tray on the means for moving the tray; and

means for detecting a height of at least one of the plurality of items,

wherein moving the items, moving the tray and injecting the items are based on the detected height of at least one of the items.