Factory line system for robot-arm work stations

• US 20060091842A1
• Filed: 10/25/2005
• Published: 05/04/2006
• Est. Priority Date: 10/29/2004
• Status: Abandoned Application

• Current Assignee: Denso Wave Inc (DENSO Corporation)
• Original Assignee: Denso Wave Inc (DENSO Corporation)
• Inventors: Nishiyama, Noritaka
• Application Number:
  US11/258,342
• Publication Number:
  US 20060091842A1
• Time in Patent Office: Days
• US Class Current: 318/568.11
• CPC Class Codes: G05B 19/4183 characterised by data acquisition, e.g. workpiece identification
• CPC Class Codes: G05B 2219/31078 Several machines and several buffers, storages, conveyors, robots
• CPC Class Codes: Y02P 90/02 Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

A factory line system includes a series of robot arms arranged alongside a conveyor on which workpieces are transported. Each workpiece is fitted with a data carrier and each robot arm is fitted with a reader/writer that can wirelessly communicate with the data carrier of each workpiece when the latter is in transit between the conveyor and a work station. Specifically, when a first robot arm detects a workpiece, it removes the workpiece from the conveyor to a first work station that performs work on the workpiece and sends result data through the reader/writer of the robot arm to the data carrier and replaces the workpiece from the first work station to the conveyor. When the workpiece is transported, approaching a second robot arm, the latter reads the result data through its reader/writer from the data carrier. According to the result data, the second work station performs work on the workpiece.

Claims

1. A factory line system comprising:

a conveyor system that carries a workpiece;

a data carrier, attached to said workpiece, that stores type-of-work information;

a robot arm provided on one side of said conveyor system for handling the workpiece;

a reader, attached to said robot arm, that wirelessly communicates with said data carrier when the robot arm is proximate to said workpiece; and

control circuitry, associated with said robot arm and said reader, that operates the robot arm to remove said workpiece from said conveyor system, causes said reader to read said type-of-work information from the data carrier while the robot arm is proximate to said workpiece, and operates said robot arm to perform work on said workpiece according to the read type-of-work information.

2. The factory line system of claim 1, wherein said control circuitry operates said robot arm to keep track of the movement of said workpiece on said conveyor system and causes said reader to read said type-of-work information from said data carrier while said robot arm is tracking said workpiece on said conveyor system.

3. A factory line system comprising:

a conveyor system that carries a workpiece;

a data carrier attached to said workpiece;

a robot arm provided on one side of said conveyor system for handling the workpiece;

a writer, attached to said robot arm, that wirelessly communicates with said data carrier when the robot arm is proximate to said workpiece; and

control circuitry, associated with said robot arm and said writer, that operates said robot arm to remove said workpiece from said conveyor system to a work station that performs work on the workpiece, receives a response signal from the work station as a result of the performance of work, causes said writer to write the received response signal into said data carrier while the robot arm is proximate to said workpiece, and operates said robot arm to replace the workpiece to said conveyor system.

4. The factory line system of claim 3, wherein said control circuitry operates said robot arm to keep track of the movement of said conveyor system and causes said writer to write said response signal into said data carrier while said robot arm is tracking the movement of said conveyor system in an attempt to replace the workpiece to the conveyor system.

5. The factory line system of claim 3, further comprising:

a further robot arm provided on one side of said conveyor system for handling the workpiece;

a reader, attached to said robot arm, that wirelessly communicates with said data carrier; and

control circuitry, associated with said further robot arm and said reader, that operates the further robot arm to remove said workpiece from said conveyor system, causes said reader to read said response signal from the data carrier while the robot arm is proximate to said workpiece, and operates said further robot arm to perform work on said workpiece according to the read response signal.

6. The factory line system of claim 5, wherein said control circuitry operates said further robot arm to keep track of the movement of said workpiece on said conveyor system and causes said reader to read said type-of-work information from said data carrier while said further robot arm is tracking said workpiece.

7. The factory line system of claim 5, wherein said response signal is a coded signal capable of correcting an error introduced therein by interference.

8. A factory line system comprising:

a conveyor system that carries a workpiece;

a data carrier on said workpiece;

a robot arm, provided on one side of said conveyor system, for handling the workpiece;

a communication device, attached to said robot arm, that wirelessly communicates with said data carrier when the robot arm is proximate to said workpiece; and

control circuitry, associated with said robot arm and said communication device, that operates said robot arm to hold said workpiece and causes said communication device to communicate with said data carrier while the robot arm is proximate to the workpiece.

9. The factory line system of claim 8, wherein said control circuitry operates said robot arm to keep track of the movement of said workpiece on said conveyor system and causes said communication device to communicate with said data carrier while said robot arm is tracking said workpiece.

10. The factory line system of claim 8, wherein said data carrier includes an integrated circuit chip.

11. The factory line system of claim 8, wherein said communication device wirelessly communicates with said data carrier using a coded signal capable of correcting an error therein.

12. A method of operating a factory line system including a conveyor system and a robot arm provided on one side, of said conveyor system, comprising the steps of:

a) providing a workpiece on said conveyor system;

b) attaching a data carrier to said workpiece;

c) attaching a communication device to said robot arm, said communication device being capable of wirelessly communicating with said data carrier when the robot arm is proximate to said workpiece; and

d) operating said robot arm to hold said workpiece and causing said communication device to communicate with said data carrier while the robot arm is proximate to said workpiece.

13. The method of claim 12, wherein step (d) comprises the steps of operating said robot arm to keep track of the movement of said workpiece on said conveyor system and causing said communication device to communicate with said data carrier while said robot arm is tracking said workpiece on said conveyor system.

14. The method of claim 12, wherein step (d) comprises the steps of:

d1) operating said robot arm to remove said workpiece from said conveyor system to a work station;

d2) performing work on the workpiece on said work station;

receiving a response signal from the work station as a result of the performance of work; and

d3) causing said communication device to write the received response signal to said data carrier and operating said robot arm to replace the workpiece to said conveyor system.

15. The method of claim 12, wherein said data carrier stores type-of-work information, wherein step (d) comprises the step of causing said communication device to read said type-of-work information from the data carrier while the robot arm is proximate position and operating said robot arm to perform work on said workpiece according to the read type-of-work information.

16. The method of claim 14, wherein step (d3) comprises the steps of:

operating said robot arm to keep track of the movement of said conveyor system; and

causing said communication device to write said received response signal into said data carrier while said robot arm is tracking the movement of said conveyor system in an attempt to replace the workpiece to the conveyor system.

17. A factory line system including a robot arm provided in the neighborhood of a conveyor system on which workpieces of different types of work to be performed are transported, said robot arm having a holder fitted to a forward end of the robot arm for holding one of said workpieces and removing said one workpiece from the conveyor system, comprising:

a data carrier, attached to each of said workpieces, that stores information indicating the type of work of the workpiece;

tracking control means that controls said robot arm so that said forward end of the robot arm keeps track of the movement of said one workpiece on said conveyor system;

reading means, attached to said forward end of said robot arm, that wirelessly communicates with said data carrier to read the type-of-work information of said one workpiece stored in said data carrier; and

work control means that determines work to be performed according to the information read by said reading means and controls said robot arm according the determined work,

wherein said reading means performs reading of said stored information from said one workpiece during a time interval that runs from the instant said forward end of the robot arm approaches said one workpiece while the same is being transported on said conveyor system and then kept track of by said forward end to the instant said one workpiece is removed from said conveyor system.

18. A factory line system including a robot arm provided in the neighborhood of a conveyor system on which a workpiece is transported, said robot arm having a holder fitted to a forward end of the robot arm for holding said workpiece and removing said one workpiece from the conveyor system to a work station and replacing the workpiece to said conveyor system after work is performed by said work station on said workpiece, comprising:

a data carrier, attached to said workpiece, into which information is written and from which the stored information is read out;

tracking control means that controls said robot arm so that said forward end of the robot arm keeps track of the movement of said conveyor system;

communication means that receives work result information from said work station, said information indicating a result of said work performed by said work station on said workpiece; and

writing means, attached to said forward end of said robot arm, that writes the work result information of said workpiece into said data carrier,

wherein said writing means performs writing of said work result information into said data carrier during a time interval that runs from the instant said forward end of the robot arm approaches said workpiece on said work station and then keeps track of the movement of said conveyor system to the instant said workpiece is replaced to the conveyor system.

19. A factory line system comprising:

a conveyor system on which a workpiece is transported;

a first robot arm having a holder fitted to a forward end of the first robot arm for holding said workpiece and removing said one workpiece from the conveyor system to a work station and replacing the workpiece to said conveyor system after work is performed by said work station on said workpiece;

a second robot arm having a holder fitted to a forward end of the second robot arm for holding said workpiece and removing said one workpiece from the conveyor system to perform work;

a data carrier, attached to said workpiece, into which information is written and from which the stored information is read out;

first tracking control means that controls said first robot arm so that said forward end of the first robot arm keeps track of the movement of said conveyor system;

communication means that receives work result information from said work station, said information indicating a result of said work performed by said work station on said workpiece; and

writing means, attached to the forward end of said first robot arm, that writes the work result information of said workpiece into said data carrier,

second tracking control means that controls said second robot arm so that the forward end of the second robot arm keeps track of the movement of said workpiece on said conveyor system;

reading means, attached to said forward end of said robot arm, that wirelessly communicates with said data carrier to read the type-of-work information of said one workpiece stored in said data carrier; and

work control means that determines work to be performed according to the information read by said reading means and controls said second robot arm according the determined work,

wherein said writing means performs writing of said work result information into said data carrier during a time interval that runs from the instant said forward end of the first robot arm approaches said workpiece on said work station and then keeps track of the movement of said conveyor system to the instant said workpiece is replaced to the conveyor system,

wherein the holder of said second robot arm holds said workpiece while the forward end of the second robot arm is tracking the movement of the workpiece on said conveyor system, and

wherein said reading means performs reading of said stored information from said one workpiece during a time interval that runs from the instant said forward end of the second robot arm approaches said one workpiece while the same is being transported on said conveyor system and then kept track of by said forward end of said second robot arm to the instant said one workpiece is removed from said conveyor system.