Bidirectional roller deck control for a self guided vehicle

• US 4,792,995 A
• Filed: 08/19/1987
• Issued: 12/20/1988
• Est. Priority Date: 08/19/1987
• Status: Expired due to Fees

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Harding, Joseph J.
• Primary Examiner(s): Griffin, Robert L.
• Assistant Examiner(s): Van Beek, Leslie
• Application Number:
  US07/087,048
• Time in Patent Office: 489 Days
• Field of Search: 370/3, 455/603, 455/604, 455/606, 455/607, 455/608, 455/617, 414/265, 414/272, 414/273, 414/278, 414/351, 414/353, 414/398, 414/468, 414/499, 414/502, 414/507, 414/518, 414/574
• US Class Current: 398/109
• CPC Class Codes: H04B 10/801 using optical interconnects, e.g. light coupled isolators, circuit board interconnections

Abstract

A self guided vehicle has a roller deck controllably powered by an electric motor to accept and deliver loads on both the left and right side of the vehicle. An infrared communication system is employed to coordinate the overall transfer of these loads between the vehicle and a docking station. The communication system performs the multiple functions of locating the docking station relative to the left and right side of the vehicle, determining the direction the load is to be transferred, and controlling the direction of motor rotation to effect such a transfer.

Claims

1. An apparatus for controlling the operation of a powered conveyor of a self guided vehicle in coordination with a powered conveyor of a docking station, the vehicle and docking station conveyors each driven by an electric motor, the apparatus comprising:

first and second radiant energy emitting means for producing pulsed radiant energy in response to receiving respective pulse control signals, the first and second radiant energy emitting means being mounted on opposing sides of the vehicle and directed generally outward from the vehicle;

third radiant energy emitting means for producing pulsed radiant energy in response to receiving a pulse control signal, the third radiant energy emitting means being mounted on the docking station and generally directed outward from the docking station;

first and second radiant energy detecting means for producing electrical signals responsive to receiving radiant energy from the third radiant energy emitting means, the first and second radiant energy detecting means being mounted on opposing sides of the vehicle and directed generally outward from the vehicle;

third radiant energy detecting means for producing electrical signals responsive to receiving radiant energy from one of the first and second radiant energy emitting means, the third radiant energy detecting means being mounted on the docking station and directed generally outward from the docking station;

vehicle control means for delivering pulse control signals to the first and second radiant energy emitting means, monitoring the first and second radiant energy detecting means for a preselected period of time, and controlling the direction of energization of the vehicle electric motor responsive to receiving an electrical signal from one of the first and second radiant energy detecting means;

docking station control means for delivering pulse control signals to the third radiant energy emitting means, monitoring the third radiant energy detecting means, and controlling the energization of the docking station electric motor responsive to receiving an electrical signal from the third radiant energy detecting means; and

load transfer means for loading onto the vehicle conveyor from the docking station conveyor at either side of the vehicle, and unloading from the vehicle conveyor onto the docking station conveyor at either side of the vehicle.

2. An apparatus for controlling the operation of a powered conveyor of a self guided vehicle in coordination with a powered conveyor of a docking station, the vehicle and docking station conveyors each driven by an electric motor, the apparatus comprising:

first and second radiant energy eimtting means for producing pulsed radiant energy in response to receiving respective pulse control signals, the first and second radiant energy emitting means being mounted on opposing sides of the vehicle and generally directed outward from the vehicle;

third radiant energy emitting means for producing pulsed radiant energy in response to receiving a pulse control signal, the third radiant energy emitting means being mounted on the docking station and generally directed outward from the loading end of the docking station;

first and second radiant energy detecting means for producing electrical signals responsive to receiving radiant energy from the third radiant energy emitting means, the first and second radiant energy detecting means being mounted on opposing sides of the vehicle and generally directed outward from the vehicle;

third radiant energy detecting means for producing electrical signals responsive to receiving radiant energy from one of the first and second radiant energy emitting means, the third radiant energy detecting means being monnted on the docking station and generally directed outward from the loading end of the docking station; and

vehicle control means for delivering pulse control signals to the first and second radiant energy emitting means, monitoring the first and second radiant energy detecting means for a preselected period of time, and controlling the direction of energization of the vehicle electric motor responsive to receiving an electrical signal from one of the first and second radiant energy detecting means;

means for delivering an unload signal to cause the vehicle to deliver a load from the vehicle conveyor to the docking station conveyor and delivering a load signal to cause the conveyor of the vehicle to receive a load from the docking station conveyor;

first load transfer means for energizing the vehicle electric motor in a first direction in response to receiving the elecrtrical signal from the first radiant energy detecting means and the unload signal;

second load transfer means for energizing the vehicle electric motor in a second direction in response to receiving the electrical signal from the first radiant energy detecting means and the unload signal;

third load transfer means for energizing the vehicle electric motor in the first direction in response to receiving the electrical signal from the second radiant energy detecting means and the load signal; and

fourth load transfer means for energizing the vehicle electric motor in the second direction in response to receiving the electrical signal from the second radiant energy detecting means and the unload signal.

3. An apparatus, as set forth in claim 2, including means for detecting the presence of a load on the vehicle conveyor and delivering a vehicle load fully-on signal wherein the first and third load transfer means include means for deenergizing the vehicle electric motor in response to receiving the vehicle load fully-on signal.

4. An apparatus, as set forth in claim 3, wherein the first and third load transfer means includes means for deenergizing the first and second radiant energy emitting means in response to receiving the vehicle load fully-on signal.

5. An apparatus, as set forth in claim 4, including a docking station control means for controlling the direction of energization of the docking station electric motor in response to receiving both an electrical signal from the third radiant energy detecting means and one of the load and unload signal.

6. An apparatus, as set forth in claim 5, wherein the docking station control means includes means for energizing the docking station electric motor in a first direction to response to receiving both the electrical signal from the third radiant energy detecting means and the load signal;

and

means for energizing the docking station electric motor in a second direction in response to receiving both the electrical signal from the third radiant energy detecting means and the unload signal.

7. An apparatus, as set forth in claim 2, wherein the second and fourth load transfer means include means for deenergizing the vehicle electric motor in response to the absence of the electrical signal from both the first and second radiant energy detecting means.

8. An apparatus, as set forth in claim 7, wherein the second and fourth load transfer means include means for dennergizing the first and second radiant energy emitting means in response to the absence of the electrical signal from both the first and second radiant energy detecting means.

9. An apparatus, as set forth in claim 8, including means for detecting the presence of a load on the docking station conveyor and delivering a station load fully-on signal wherein the second and fourth load transfer means includes means for deenergizing the third radiant energy emitting means in response to receiving the station load fully-on signal.

10. An apparatus, as set forth in claim 4, wherein the first and third load transfer means include means for deenergizing the third radiant energy emitting means in response to the absence of the electrical signal from the third radiant energy detecting means.