Product sorting apparatus

• US 5,186,336 A
• Filed: 01/22/1991
• Issued: 02/16/1993
• Est. Priority Date: 01/22/1991
• Status: Expired due to Fees

• Current Assignee: Siemens ElectroCom, L.P.
• Original Assignee: Electrocom Automation L.P.
• Inventors: Pippin, James M., Robertson, Gary S., Flagg, Kenneth C. Jr.
• Primary Examiner(s): Hajec, Donald T.
• Application Number:
  US07/643,853
• Time in Patent Office: 756 Days
• Field of Search: 209/564, 209/565, 209/566, 209/569, 209/583, 209/657, 209/934, 209/900, 271/305 X, 271/297 X, 271/270 X, 364/478, 198/460 X, 198/367.1, 198/367.2 X, 198/781
• US Class Current: 209/583
• CPC Class Codes: B07C 5/3412 according to a code applied to the object which indicates a property of the object, e.g. quality class, contents or incorrect indication sorting according to size measured by light-responsive means B07C5/10; sorting according to optical properties B07C5/342; for packages B65D79/02; for information carriers G06K7/00
• CPC Class Codes: B07C 5/361 Processing or control devices therefor, e.g. escort memory
• CPC Class Codes: B65G 13/00 Roller-ways storage devices comprising roller-ways B65G1/02; endless-chain conveyors comprising load-supporting rollers B65G17/00; rollers or arrangements thereof B65G39/00
• CPC Class Codes: B65G 47/78 Troughs having discharge openings and closures in air-slides B65G53/20
• CPC Class Codes: Y10S 209/90 Sorting flat-type mail

Abstract

A wide variety of product types, sizes and shapes are sorted into designated destination bins or other outputs utilizing a computer controlled transport path that includes an infeed section and a pinch roller diverting section. The infeed section receives a singulated stream of products to be sorted, optically scans each product for a destination code and transports the products downstream to the diverting section. The diverting section consist of a series of individually and selectively controlled roller pairs in combination with a number of diverting gates. Each roller pair includes an upper foam covered pinch roller and a lower friction drive roller oriented such that products moving downstream pass between each roller pair until diverted from the transport path. An array of photoelectric detectors provide product position information to identify and track product movement through the apparatus. The computer controls the transport path by energizing individual drive rollers to effectuate downstream product movement, and actuating diverting gates to divert the products from the transport path into designated output bins according to their scanned destination codes.

Claims

1. A method for diverting a selected product in a stream of products from a transport path having a plurality of diverting gates leading to output destinations comprising the steps of:

identifying one of the plurality of diverting gates on the transport path leading to a selected output destination for the selected product;

moving the selected product along the transport path to the identified diverting gate for the selected output destination;

opening the identified diverting gate for the selected output destination; and

accelerating movement of a selected portion of the transport path to propel the selected product from the transport path to the selected output destination.

2. The method for diverting as in claim 1 wherein the step of identifying includes the steps of:

scanning a code affixed to the selected product, the code related to one of the output destinations; and

locating the diverting gate corresponding to the output destination for the scanned code.

3. The method for diverting as in claim 1 wherein the step of moving includes the step of tracking movement of the selected product along the transport path.

4. The method for diverting as in claim 1 further including the step of controlling movement of the selected product along the transport path to maintain a predetermined distance between the selected product and a preceding product in the stream.

5. The method for diverting as in claim 4 wherein the step of controlling movement includes the steps of:

stopping movement of the selected product along the transport path when further movement of the selected product brings the selected product within a predetermined distance of the preceding product in the stream; and

starting movement of the selected product along the transport path when the distance between the selected product and the preceding product exceeds the predetermined distance.

6. Apparatus for diverting a selected product in a stream of products from a transport path, comprising:

transport means defining the transport path for conveying the stream of products;

said transport means comprising;

a plurality of drive rollers for conveying products;

drive means for each roller to selectively actuate each roller to control product movement along the transport path; and

means for accelerating each drive roller by the drive means to propel a product form the transport path;

a diverter gate having a contact surface for diverting products form the transport path, the contact surface pivotally mounted to the transport means at a pivotal end thereof and having a distal end; and

actuation means for moving the diverter gate between a normally closed position and an open position.

7. The apparatus for diverting as in claim 6 wherein the actuation means includes an actuation arm mounted to the contact surface at the distal end to move the diverter gate between the normally closed and open positions.

8. The apparatus for diverting as in claim 6 further including means for tracking conveyance of the stream of products along the transport path.

9. The apparatus for diverting as in claim 8 wherein the means for tracking further includes means for selectively actuating the drive means to stop and start conveyance of a selected product to maintain a predetermined distance between the selected product and a preceding product in the stream of products.

10. Apparatus for diverting, comprising:

transport means for conveying a product along a transport path including a plurality of individually and selectively actuated drive rollers;

drive means for individually and selectively actuating each of the plurality of drive rollers;

normally closed diverter means having an opened position for inserting into the transport path to divert products from said transport means;

means for tracking conveyance of the product along the transport path; and

control means, responsive to the means for tracking, for selectively moving the diverter means to the opened position and for accelerating actuation of the drive rollers by the drive means at the diverter means in the opened position to propel the product from the transport means.

11. Apparatus as in claim 10 wherein said means for tracking comprises an array of photoelectric detectors.

12. Apparatus as in claim 10 wherein the control means further includes means for controlling the drive means in response to the means for tracking to stop and start actuation of the drive rollers to prevent one product from tailgating within a predetermined distance of a preceding product on the transport means.

13. Apparatus as in claim 10 wherein the diverter means comprises:

a diverting gate comprising;

a substantially rectangular plate having a first and second transverse edge extending across the transport means and a pair of side edges; and

means for rotatably mounting the first transverse edge of said rectangular plate to the transport means; and

means, responsive to the control means, for selectively causing said rectangular plate to rotate about said means for rotatably mounting between the normally closed and opened positions.

14. Apparatus as in claim 13 wherein the means for selectively causing further includes an actuation arm mounted to the side edge of the rectangular plate proximate to the second transverse edge to move the diverting gate between the normally closed and open positions.

15. A method for conveying and diverting a stream of products, comprising the steps of:

conveying the stream of products along a transport path having a plurality of diverting gates;

actuating one or more roller pairs to cause downstream movement of products through the transport path;

tracking the position and movement of each product along the transport path;

selectively controlling the movement of each product in the stream of products to maintain a separation distance between one tracked product and a preceding tracked product;

opening a selected one of the plurality of diverting gates for each product to cause each tracked product in a product stream to be diverted form the transport path to a selected output destination; and

accelerating the rotation of a roller pair at the open diverting gate to accelerate the tracked product from the transport path.

16. The method for diverting as in claim 15 wherein the step of selectively controlling movement further includes the steps of:

stopping movement of the tracked product along the transport path when further movement of the tracked product brings the tracked product within the separation distance of the preceding tracked product; and

starting movement of the stopped tracked product along the transport path when the distance between the stopped tracked product and the preceding tracked product exceeds the separation distance.