Modular manufacturing line including a buffer and methods of operation therefor

• US 20090277748A1
• Filed: 01/09/2009
• Published: 11/12/2009
• Est. Priority Date: 05/09/2008
• Status: Abandoned Application

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Spangler, John M., Bilson, David G.
• Application Number:
  US12/319,670
• Publication Number:
  US 20090277748A1
• Time in Patent Office: Days
• US Class Current: 198/345.300
• CPC Class Codes: B65G 35/066 the bar or the tube being provided with a helical or annular channel

Abstract

A manufacturing line includes a plurality of manufacturing modules positioned in series and defining a main path through the manufacturing line. A main track assembly is supported by the manufacturing modules and includes at least a first friction drive system for transporting a trolley assembly along the main path. A buffer is positioned to receive the trolley assembly from the main path and includes a first track assembly that includes at least a second friction drive system for transporting the trolley assembly along the first track assembly. The first track assembly is sized to support at least two trolley assemblies thereon. The sequencing buffer also includes a second track assembly that includes at least a third friction drive system for transporting the trolley assembly along the second track assembly. The second track assembly is also sized to support at least two trolley assemblies thereon. A first movable track assembly of the sequencing buffer is movable between a first position defining a first continuous path along the first movable track assembly and the first track assembly, and a second position defining a second continuous path along the first movable track assembly and the second track assembly.

Claims

1. A manufacturing line including a plurality of manufacturing modules positioned in series and defining a main path through the manufacturing line, comprising:

a main track assembly supported by the manufacturing modules and including a friction drive system for transporting a trolley assembly along the main path; and

a buffer positioned to receive the trolley assembly from the main path and including;

a first track assembly including the friction drive system for transporting the trolley assembly along the first track assembly, the first track assembly being sized to support at least two trolley assemblies thereon;

a second track assembly including the friction drive system for transporting the trolley assembly along the second track assembly, the second track assembly being sized to support at least two trolley assemblies thereon; and

a first movable track assembly movable between a first position defining a first continuous path along the first movable track assembly and the first track assembly, and a second position defining a second continuous path along the first movable track assembly and the second track assembly.

2. The manufacturing line of claim 1, wherein the trolley assembly includes a carrier having a first end pivotably supported by a first trolley and a second end pivotably supported by a second trolley.

3. The manufacturing line of claim 2, wherein the buffer further includes a second movable track assembly movable between a third position defining a third continuous path along the second movable track assembly and the first track assembly, and a fourth position defining a fourth continuous path along the second movable track assembly and the second track assembly.

4. The manufacturing line of claim 3, wherein the second track assembly is vertically spaced from the first track assembly.

5. The manufacturing line of claim 4, further including a third track assembly vertically spaced from the second track assembly.

6. The manufacturing line of claim 4, further including a first transfer device for moving the first movable track assembly between the first position and the second position, and a second transfer device for moving the second movable track assembly between the third position and the fourth position.

7. The manufacturing line of claim 6, wherein the friction drive system is configured to transport the trolley assembly in a first direction along the first track assembly and in a second direction along the second track assembly, the second direction being opposite the first direction.

8. The manufacturing line of claim 3, wherein the first movable track assembly includes the friction drive system for transporting the trolley assembly along the first movable track assembly, and the second movable track assembly includes the friction drive system for transporting the trolley assembly along the second movable track assembly.

9. The manufacturing line of claim 8, wherein each of the first track assembly, the second track assembly, the first movable track assembly, and the second movable track assembly includes a composite beam including an upper rail and a lower track connected through a plurality of spaced apart transverse members.

10. A method of operating a buffer, comprising:

distributing at least three trolley assemblies among a first track assembly and a second track assembly of the buffer such that a first trolley assembly is blocked from an exit position; and

redistributing the at least three trolley assemblies among the first track assembly and the second track assembly to position the first trolley assembly at the exit position;

wherein the redistributing step includes;

moving at least a second trolley assembly along the first track assembly and onto a first movable track assembly using a friction drive system;

moving the first movable track assembly from a first position to a second position; and

moving the second trolley assembly from the first movable track assembly and onto the second track assembly using the friction drive system.

11. The method of claim 10, wherein the redistributing step further includes moving the first trolley assembly along the first track assembly and into the exit position using the friction drive system.

12. The method of claim 10, wherein the redistributing step further includes:

moving at least a third trolley assembly along the second track assembly and onto a second movable track assembly;

moving the second movable track assembly from a first position to a second position; and

moving the third trolley assembly from the second movable track assembly and onto the first track assembly.

13. The method of claim 12, wherein the step of moving the first movable track assembly includes raising or lowering the first movable track assembly using a first transfer device, and the step of moving the second movable track assembly includes raising or lowering the second movable track assembly using a second transfer device.

14. A method of operating a manufacturing line, comprising:

transporting an article through the manufacturing line, at least in part, by;

supporting the article on a carrier, the carrier being supported by a first trolley assembly;

moving the first trolley assembly along a main track assembly using a friction drive system;

transferring the first trolley assembly from the main track assembly and into a buffer;

redistributing the first trolley assembly and a plurality of other trolley assemblies among a first track assembly and a second track assembly of the buffer; and

transferring the first trolley assembly from the buffer and onto the main track assembly after the redistributing step.

15. The method of claim 14, wherein the redistributing step includes redistributing the first trolley assembly and the plurality of other trolley assemblies such that the first trolley assembly is blocked from an exit position.

16. The method of claim 15, wherein the step of transferring the first trolley assembly from the buffer and onto the main track assembly further includes:

moving at least a second trolley assembly along the first track assembly and onto a first movable track assembly;

moving the first movable track assembly from a first position to a second position; and

moving the second trolley assembly from the first movable track assembly and onto the second track assembly.

17. The method of claim 16, wherein the step of transferring the first trolley assembly from the buffer and onto the main track assembly further includes moving the first trolley assembly along the first track assembly and into the exit position.

18. The method of claim 17, wherein the step of transferring the first trolley assembly from the buffer and onto the main track assembly further includes:

moving at least a third trolley assembly along the second track assembly and onto a second movable track assembly;

moving the second movable track assembly from a first position to a second position; and

moving the third trolley assembly from the second movable track assembly and onto the first track assembly.

19. The method of claim 18, wherein the step of moving the first movable track assembly includes raising or lowering the first movable track assembly using a first transfer device, and the step of moving the second movable track assembly includes raising or lowering the second movable track assembly using a second transfer device.