Low stock alert system

• US 20060164247A1
• Filed: 11/17/2005
• Published: 07/27/2006
• Est. Priority Date: 11/19/2004
• Status: Active Grant

• Current Assignee: ABL IP Holding LLC (Acuity Brands, Inc.)
• Original Assignee: Cordjia Management Services LLC
• Inventors: Hardman, Gordon E., Pyne, John W., Overhultz, Gary L.
• Granted Patent: US 7,233,241 B2
• Time in Patent Office: Days
• US Class Current: 340/572.100
• CPC Class Codes: A47F 10/02 for self-service type systems, e.g. supermarkets A47F10/06 takes precedence; hand-carts B62B; baskets B65D
• CPC Class Codes: G06K 17/0022 arrangements or provisious for transferring data to distant stations, e.g. from a sensing device "transfer between computer elements G06F13/00 "; data-transmission H04L
• CPC Class Codes: G06Q 10/087 Inventory or stock management, e.g. order filling, procurement or balancing against orders

Abstract

A low product stock display system for detecting at least one of fully stocked, partially stocked, and empty (no stock) shelf has been described. The presence/absence of stock can be detected by conductive contact sensors, inductance sensors, weight sensors, optical sensors, and, in the preferred embodiment, with an RF transmission line. The data from a sensor is wirelessly relayed to an external server for processing across a plurality of facilities, and can provide alerts to personnel or systems responsible for reordering or restocking the particular shelf or display at the facility.

Claims

1. A low stock-alert sensing system comprising:

at least one display device for stocking a product;

a sensor associated with each display device for sensing presence/absence of stocked product and generating a product availability status data signal; and

an RF tag coupled to the sensor for receiving the sensor signals and relaying the sensor signals to a remote location for processing.

2. The system of claim 1 wherein:

the at least one display device comprises at least one shelf for stocking products;

the RF tag is an RFID tag that stores an identification data signal representing the at least one display device; and

the RF tag relays the received product availability status data signal with the display identification data signal to a remote location for processing.

3. The system of claim 2 wherein the sensor for sensing presence/absence of stocked product and generating a product availability status data signal comprises:

an inductance sensor that generates shelf product availability status data signals representing at least one of fully stocked, empty, and partially stocked product availability.

4. The system of claim 3 wherein the inductance sensor comprises:

an electrically conducting wire associated with each display shelf to form at least one loop on each shelf for generating a magnetic field whose signal strength varies with amount of stocked product on the associated display shelf and represents the stock presence/absence data signal;

the RFID tag is coupled to the at least one of the electrically conductive wires on at least one of the display shelves for receiving the magnetic field strength signal; and

a circuit forming part of said tag for deciphering the magnetic field strength signal to determine product availability on the at least one of the display shelves.

5. The system of claim 2 wherein the sensor for sensing presence/absence of stocked product and generating a product availability status data signal comprises:

a weight sensor that generates shelf product availability status data signals representing at least one of fully stocked, empty, and partially stocked product availability.

6. The system of claim 5 wherein the weight sensor comprises:

at least two layers of flexible material on which the stocked product is placed; and

at least one micro switch between the at least two layers of flexible material that is in a first one of an open/closed position when stocked product is placed on the flexible material and is in the other one of the open/closed position when stocked product is low or no longer on the shelf.

7. The system of claim 5 wherein the weight sensor comprises:

a reusable platform on which the stocked product is placed; and

at least one continuous-state device associated with the reusable platform for generating signals representing at least one of fully stocked, empty, and partially stocked product availability.

8. The system of claim 2 wherein the sensor for sensing presence/absence of stocked product and generating a product availability status data signal comprises:

an optical sensor that generates product availability status data signals representing at least one of fully stocked, empty, and partially stocked product availability.

9. The system of claim 8 wherein the optical sensor comprises:

a light-beam sensing device for purposes of monitoring presence/absence of product availability.

10. The system of claim 9 wherein the light-beam sensing device comprises:

a number of lights on one side of the columns of product for generating a light beam, one light beam for each column of product;

a corresponding number of photoelectric cell light sensors on the opposite side of each column of product; and

a pulsing circuit coupled to each of the lights to pulse the lights periodically in succession whereby the presence of product interrupts the light beam causing one or more of the light sensors to signal one of an empty/non-empty product availability state for each column of product.

11. The system of claim 2 wherein the sensor for sensing presence/absence of stocked product and generating a product availability status data signal comprises:

a conductive contact sensor detecting varying dielectric properties of product present on each shelf.

12. The system of claim 11 wherein the conductive contact sensor comprises:

at least one pair of wires on each shelf, each pair of wires separated by a distance sufficient to allow product to rest on both wires in a given pair such that one or more stocked product resting on a pair of wires causes the electrical resistance across the wire pair to be varied;

a low voltage source, sufficiently low to protect the product, coupled to each pair of wires; and

a tag, including a microprocessor on the tag, for monitoring changes in voltage on the wires because of the presence/absence of stocked product.

13. The system of claim 12 further comprising a separate monitoring of each wire pair to detect the presence/absence of stocked product within and/or across each shelf.

14. The system of claim 2 wherein the sensor for sensing presence/absence of stocked product and generating a product availability status data signal comprises:

a radio based stocked product availability detector utilizing RF signals that are output to a well matched transmission line and becomes mismatched when items are present on a shelf; and

a signal detector for determining the amount of RF signal reflection caused by the change in impedance of a transmission line and the line to become mismatched and reflect signals thereby detecting the presence/absence of stocked product.

15. The system of claim 14 wherein the radio based stocked product availability detector further comprises:

an RF signal transmission line having first and second ends and air space on at least one side;

a resistor terminating the first end of the transmission line in its characteristic impedance to absorb the transmitted RF energy;

a directional signal detector being coupled to the second end of the transmission line for detecting signal reflections caused by a mismatch of the line due to the presence of product;

an RF signal generator providing RF signal pulses to the directional signal detector for application to the RF signal transmission line; and

a threshold detector coupled to the directional signal detector for measuring the signals reflected by the stocked product to determine presence/absence of the stocked product.

16. They system of claim 15 wherein the transmission line comprises a microstrip line.

17. The system of claim 15 wherein the transmission line comprises elongated parallel lines.

18. The system of claim 5 wherein the weight sensor comprises:

at least two layers of flexible conductive material on which the stocked product is to be placed; and

a dielectric material disposed between the at least two layers of flexible material, whereby the weight sensor produces relatively low resistance readings across the layers of flexible conductive material when a stocked product is placed on said flexible material and produces relatively higher resistance readings across the layers of flexible conductive material when a stocked product is low or no longer on the shelf.