Electrostatic barrier for a robotic painting system for conductive materials

• US 10,639,655 B2
• Filed: 10/29/2013
• Issued: 05/05/2020
• Est. Priority Date: 10/29/2013
• Status: Active Grant

• Current Assignee: Fanuc America Corporation (Fanuc Corporation)
• Original Assignee: Fanuc America Corporation (Fanuc Corporation)
• Inventors: Waineo, Douglas B., Otani, Ernest M.
• Primary Examiner(s): Ewald, Maria V
• Assistant Examiner(s): Utt, Ethan A.
• Application Number:
  US14/065,780
• Publication Number:
  US 20150118439A1
• Time in Patent Office: 2,380 Days
• Field of Search: 901 43, 428119, 428422, 428421, 428192, 428194
• CPC Class Codes: B05B 5/025 Discharge apparatus, e.g. electrostatic spray guns
• CPC Class Codes: B05B 5/1608 the liquid or other fluent material being electrically conductive
• CPC Class Codes: B05B 5/1616 and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material
• CPC Class Codes: B05B 5/1675 the supply means comprising a piston, e.g. a piston pump
• CPC Class Codes: H01B 3/428 Polyacetals
• CPC Class Codes: H01B 3/445 from vinylfluorides or other fluoroethylenic compounds
• CPC Class Codes: Y10S 901/43 Spray painting or coating
• CPC Class Codes: Y10T 428/24174 including sheet or component perpendicular to plane of web or sheet
• CPC Class Codes: Y10T 428/31544 Addition polymer is perhalogenated
• CPC Class Codes: Y10T 428/31942 Of aldehyde or ketone condensation product

Abstract

A robotic electrostatic painting system includes a barrier formed from an electrical insulating material and disposed between adjacent reservoirs for holding a conductive paint used in an electrostatic painting operation. The barrier is shaped and dimensioned with a central plate and upper and lower flanges to block every straight line path between the reservoirs to electrostatically separate the reservoirs and prevent the formation of a ground path or short circuit when there is a voltage difference between the reservoirs. The electrostatic separation of the reservoirs further prevents deterioration of conductive components of the robotic electrostatic painting system.

Claims

1. A robotic painting apparatus including two adjacent paint reservoirs mounted side-by-side on a robot arm and adapted to operate as an electrostatic direct charge painting system, comprising:

an electrostatic barrier formed from an electrical insulating material, the barrier being disposed on the robot arm between the two adjacent paint reservoirs wherein there is no straight line path between the paint reservoirs that does not pass through the barrier, the barrier electrostatically insulating the paint reservoirs from each other thereby preventing formation of a ground path or short circuit between the paint reservoirs.

2. The apparatus according to claim 1 wherein the electrical insulating material has a dielectric strength greater than 300 V/mil.

3. The apparatus according to claim 1 wherein the electrical insulating material is a polytetrafluoroethylene material.

4. The apparatus according to claim 1 wherein the electrical insulating material is an acetal copolymer material.

5. The apparatus according to claim 1 wherein the barrier is shaped to limit a shortest path between the paint reservoirs that does not pass through the barrier to no less than 100 mm.

6. The apparatus according to claim 1 wherein the barrier has a length along a longitudinal axis greater than a longitudinal length of each the adjacent paint reservoirs.

7. The apparatus according to claim 6 wherein the length of the barrier is greater than the longitudinal length of each of the paint reservoirs by at least 10 mm at each longitudinal end of the paint reservoirs.

8. The apparatus according to claim 1 wherein the barrier is assembled from at least two components.

9. The apparatus according to claim 8 wherein the barrier components include a central plate having a top surface and a bottom surface, an upper flange adapted to be attached to the central plate at the top surface, and a lower flange adapted to be attached to the central plate at the bottom surface.

10. A robotic painting apparatus for operation as an electrostatic direct charge painting system for conductive materials, comprising:

a robot arm;

a first paint reservoir and a second paint reservoir mounted side-by-side on the robot arm; and

an electrostatic barrier formed from an electrical insulating material having a dielectric strength greater than 300 V/mil, the barrier being assembled from a plurality of components, the barrier being disposed on the robot arm between the first and second paint reservoirs wherein there is no straight line path between the paint reservoirs that does not pass through the barrier, the barrier electrostatically insulating the paint reservoirs from each other thereby preventing formation of a ground path or short circuit between the paint reservoirs.

11. The apparatus according to claim 10 wherein the barrier components include a central plate and an upper flange, wherein the upper flange is disposed on a top surface of the central plate and extends laterally beyond each of a first side surface and a second side surface of the central plate.

12. The apparatus according to claim 10 wherein the barrier components include a central plate and a lower flange disposed on a bottom surface of the central plate, the lower flange extending laterally beyond each of a first side surface and a second side surface of the central plate.

13. The apparatus according to claim 12 wherein the lower flange is configured to be coupled to the robot arm of the robotic painting apparatus.

14. The apparatus according to claim 10 wherein a first end of the barrier extends at least 10 mm beyond a first longitudinal end of each of the paint reservoirs in a direction parallel to a longitudinal axis of each of the paint reservoirs.

15. The apparatus according to claim 14 wherein a second end of the barrier extends at least 10 mm beyond a second longitudinal end of each of the paint reservoirs in the direction parallel to the longitudinal axes of the paint reservoirs.

16. The apparatus according to claim 10 wherein the electrical insulating material is one of a polytetrafluoroethylene material and an acetal copolymer material.

17. The apparatus according to claim 10 wherein the barrier is shaped to limit a shortest path between the first paint reservoir and the adjacent second paint reservoir that does not pass through the barrier to greater than 100 mm.

18. An apparatus for electrostatically insulating two adjacent paint reservoirs mounted on a robot arm of a robotic painting apparatus for conductive materials, comprising:

a first paint reservoir mounted on the robot arm;

a second paint reservoir mounted on the robot arm side-by-side with the first paint reservoir; and

an electrostatic barrier formed from an electrical insulating material, the barrier including a central plate having a top surface and a bottom surface, an upper flange disposed on the top surface of the central plate, and a lower flange disposed on the bottom surface of the central plate and mounted to the robot arm, the barrier being disposed with the central plate between the paint reservoirs wherein there is no straight line path between the paint reservoirs that does not pass through the barrier thereby preventing formation of a ground path or short circuit between the paint reservoirs.

19. The apparatus according to claim 18 wherein the central plate has a longitudinal length greater than a longitudinal length of each of the first and second paint reservoirs by at least 10 mm at each longitudinal end of the paint reservoirs.

20. The apparatus according to claim 18 wherein the electrical insulating material has a dielectric strength greater than 300 V/mil.