Automated guided vehicle enunciator system

• US 5,510,984 A
• Filed: 11/28/1994
• Issued: 04/23/1996
• Est. Priority Date: 11/28/1994
• Status: Expired due to Term

• Current Assignee: Board of Regents of the University of Nebraska
• Original Assignee: Board of Regents of the University of Nebraska
• Inventors: Kipp, Gary W., Markin, Rodney S.
• Primary Examiner(s): Teska, Kevin J.
• Assistant Examiner(s): Walker, Tyrone V.
• Application Number:
  US08/345,078
• Time in Patent Office: 512 Days
• Field of Search: 364/424.02, 364/461, 364/468, 364/478, 348/118, 348/119, 318/568.12, 318/587, 180/167, 180/168, 180/169
• US Class Current: 701/87
• CPC Class Codes: G05D 1/0244 using reflecting strips
• CPC Class Codes: G05D 1/0265 using buried wires

Abstract

The enunciator system for an AGV includes a transmitter mounted on the AGV connected to an electrical control circuit having a plurality of individual switches operable to cause the transmitter to transmit a specific signal upon arrival of the AGV at predetermined locations along a circuitous route. Each location along the AGV route has identifier markings detectable by the AGV such that the AGV will stop for a predetermined period of time at each location as it travels along its route. If a switch for a specific location is actuated, the transmitter will transmit a signal to a receiver at that location which then triggers an audio or visual alarm at the location to alert a person at the location as to the arrival of an item on the AGV. After a predetermined period of time, the alarm will cease and the AGV will continue along its circuitous route. If the item is not removed from the AGV at the specified location, the AGV will continue along with the route until it arrives once again at the specified location at which time it will again trigger the alarm at that location, Because each specific location has its own independent receiver to receive an independent signal from the transmitter, more than one location may be specified for different items without triggering the alarms of undesignated locations.

Claims

1. An enunciator system for an automated guided vehicle (AGV) traveling a circuitous route through a building having a plurality of designated locations, the AGV being of the type having an electrical control system for guiding and driving the vehicle along the route, and each designated location having individual identifier markings detectable by the AGV control system for recognizing and distinguishing each of said plurality of designated locations to the control system, comprising:

a transmitter mounted on said AGV, with means for transmitting a first signal to a remote receiver;

a first receiver mounted at a first of said plurality of designated locations, detecting the first signal from the transmitter and activating an alarm in response thereto;

first alarm means mounted at said first location connected to said first receiver, for alerting a person at the first location of the detection of the first signal;

an electrical control circuit connected to said AGV control system, including means for activating the transmitter to transmit the first signal upon detection of the identifier markings for said first location by the AGV control system; and

a first switch connected to said control circuit and operable between an "on" position, permitting said means for activating the transmitter to transmit the first signal, and an "off" position, preventing said means for activating the transmitter from transmitting the first signal;

said first receiver means for detecting the first signal and actuating the first alarm means including means for continuously activating the first alarm for a predetermined period of time;

said electrical control circuit including means for preventing the continued travel of the AGV for a period of time equal to the predetermined period of time for which the first alarm is continuously activated.

2. The enunciator system of claim 1, wherein said alarm means includes an audio alarm.

3. The enunciator system of claim 1, wherein said alarm means includes a visual alarm.

4. The enunciator system of claim 1, wherein said alarm means includes both an audio and visual alarm.

5. The enunciator system of claim 1, further comprising:

said transmitter including means for transmitting a second signal to a remote receiver;

a second receiver mounted at a second of said plurality of designated locations, for detecting the second signal from the transmitter and activating a second alarm in response thereto;

second alarm means mounted at said second location connected to said second receiver, for alerting a person at the second location of the detection of the second signal;

said electronic control circuit including means for activating the transmitter to transmit the second signal upon detection of the identifier markings for said second location by the AGV control system;

a second switch connected to said control circuit and operable between an "on" position permitting said means for activating the transmitter to transmit the second signal, and an "off" position, preventing said means from activating the transmitter from transmitting the second signal.

6. A method for enunciating the arrival of an item at a predetermined location, the item being carried by an automated guided vehicle (AGV) through a predetermined circuitous route, comprising the steps of:

placing an item to be transported on the AGV;

selecting a location to which the item is to be transported on an electronic control unit connected to a control system of the AGV;

activating the AGV to follow a predetermined circuitous route;

said AGV stopping at each of a plurality of predetermined locations along said route;

said electronic control unit transmitting a first signal to a first receiver at the selected first location once the AGV stops at the first location;

said first receiver activating an alarm at the first location in response to the first signal;

the step of activating an alarm at the first location including the step of continuously activating the alarm for a predetermined period of time and further comprising the step of the AGV continuing on the predetermined route once the predetermined period of time has elapsed.

7. The method of claim 6, wherein the step of activating an alarm includes the step of illuminating a light.

8. The method of claim 6, wherein the step of activating an alarm includes the step of sounding an audio alarm.

9. The method of claim 6, wherein the step of activating an alarm includes the step of activating both audio and visual alarms.

10. The method of claim 6, further comprising the steps of:

said electronic control unit transmitting the first signal to the first receiver upon arrival of the AGV at the first location upon a second trip around the AGV circuitous route.

11. The method of claim 10, further comprising the step of continuing the steps of continuing on the predetermined route and said control unit transmitting the first signal to the first receiver upon each arrival of the AGV at the first location.

12. The method of claim 11, further comprising the steps of:

removing the item from the AGV at the first location; and

deselecting the first location on the electronic control unit such that said first signal is not transmitted to the first receiver upon subsequent arrivals of the AGV at the first location.