Apparatus for processing small parts utilizing a robot and an array of tools mounted on the outer robot arm

• US 5,515,599 A
• Filed: 05/03/1994
• Issued: 05/14/1996
• Est. Priority Date: 05/03/1994
• Status: Expired due to Fees

• Current Assignee: Norman D. Best
• Original Assignee: Norman D. Best
• Inventors: Best, Norman D.
• Primary Examiner(s): Bryant, David P.
• Application Number:
  US08/237,301
• Time in Patent Office: 742 Days
• Field of Search: 29/33 J, 29/33 P, 29/33 R, 29/35.5, 29/38 C, 29/38 R, 29/705, 29/714, 29/783, 29/784, 29/785, 29/791, 29/792, 29/799, 29/720, 408/35
• US Class Current: 29/705
• CPC Class Codes: B23Q 1/5481 followed parallelly by a single rotating pair
• CPC Class Codes: B23Q 7/1431 Work holder changers B23Q7/1442 takes precedence
• CPC Class Codes: B25J 15/00 Gripping heads and other end effectors grippers used in machine tools B23Q7/04; gripping members fitted on cranes B66C1/42, B66C1/44; gripping means used in the manufacture of semiconductors H01L21/68707; gripping means used for mounting electrical components H05K13/04
• CPC Class Codes: B25J 15/04 with provision for the remote detachment or exchange of the head or parts thereof
• CPC Class Codes: B25J 15/0491 comprising end-effector racks
• CPC Class Codes: B25J 9/0096 co-operating with a working support, e.g. work-table
• CPC Class Codes: Y10T 29/5128 Rotary work - vertical axis
• CPC Class Codes: Y10T 29/513 Stationary work
• CPC Class Codes: Y10T 29/5152 with turret mechanism
• CPC Class Codes: Y10T 29/519 Turret
• CPC Class Codes: Y10T 29/53022 with means to test work or product
• CPC Class Codes: Y10T 29/53087 with signal, scale, illuminator, or optical viewer
• CPC Class Codes: Y10T 29/53404 including turret-type conveyor
• CPC Class Codes: Y10T 29/53435 including assembly pallet

Abstract

The present invention is a method and apparatus for processing a plurality of small work-pieces which each weighs under five pounds using a robot gripping a rotatable pallet for holding an array of small parts. The robot has a removable tooling plate mounted on its head for mounting an array of processing tools operating on the rotatable pallet such as pick-and-place tools, work-piece ejection tools, vertical and horizontal video cameras, reflective photocell sensors, and laser distance ranging sensors. The tools operate under control of the robot and in conjunction with rotation and elevation of the rotatable pallet with respect to the tool array. The tools are mounted by an interchangeable, standard bracket to permit quick installation or removal of the tool mounting plate and addition or placement of individual devices and sensors appropriate to particular robotic tasks.

Claims

1. An apparatus for assembling and processing work-pieces retained on a rotatable pallet having a plurality of work-piece nests for retaining the work-pieces, the apparatus comprising:

a. a robot having a head and capable of controlled X, Y, and Z movements, the robot further having a wrist joint capable of rotation in a horizontal plane;

b. a tooling plate for retaining a plurality of processing tools to perform a plurality of different operations on said work-pieces which are positioned by said robot relative to the plurality of processing tools;

c. means for mounting said tooling plate to said head of said robot such that said tooling plate is fixed;

d. means for mounting said plurality of processing tools to said tooling plate; and

e. an end effector attached to said wrist joint of said robot for temporarily gripping said rotatable pallet such that said rotatable pallet can rotate so that said work-pieces on said rotatable pallet are moved relative to said plurality of processing tools on said tooling plate.

2. An apparatus in accordance with claim 1 wherein said end effector can be moved closer to and further from said tooling plate fixed to said head of said robot.

3. An apparatus in accordance with claim 1 wherein said means for mounting said tooling plate to said head further comprises an annular split clamp tube aligned with and welded to the periphery of a central hole on said tooling plate, the annular split clamp tube removably fixed by tightening a bolt passing through tightening blocks which are welded adjacent to the split on said split clamp tube.

4. An apparatus in accordance with claim 3 wherein said annular split clamp tube has a dowel hole aligned with a complementary hole on said head of said robot and a dowel pin extends through said holes for locating said tooling plate on said head of said robot.

5. An apparatus in accordance with claim 1 wherein said means for mounting said plurality of processing tools to said tooling plate includes a plurality of brackets, bolts, and dowel pins.

6. An apparatus in accordance with claim 1 wherein said tooling plate is substantially circular.

7. An apparatus in accordance with claim 1 wherein said plurality of processing tools includes a video camera vertically viewing said plurality of work-piece nests and supported from said tooling plate by a bracket.

8. An apparatus in accordance with claim 1 wherein said tooling plate further comprises an aperture at its periphery for providing clear access to said work-pieces so that said work-pieces are successively presented to a work station around a robot work envelope by rotating said rotatable pallet.

9. An apparatus for performing processing operations on at least one work-piece, comprising:

a. a robot having a head and capable of controlled X, Y, and Z movements, the robot further having a wrist joint attached to an end effector capable of rotation in a horizontal plane;

b. a tooling plate for retaining at least one processing tool to perform an operation on said at least one work-piece which is positioned by said robot relative to the at least one processing tool;

c. means for mounting said tooling plate to said head of said robot such that said tooling plate is fixed;

d. means for mounting said at least one processing tool to said tooling plate; and

e. a gripper holder attached to said end effector of said wrist joint of said robot for temporarily gripping said at least one work-piece such that the gripper holder can rotate and move vertically so that said at least one work-piece is moved relative to said at least one processing tool on said tooling plate.

10. An apparatus in accordance with claim 9 wherein said means for mounting said tooling plate to said head further comprises an annular split clamp tube aligned with and welded to the periphery of a central hole on said tooling plate, and the annular split clamp tube is fixed to said head by tightening a bolt passing through tightening blocks which are welded adjacent to the split on the split clamp tube.

11. An apparatus in accordance with claim 10 wherein said annular split clamp tube has a dowel hole aligned with a complementary hole on said head of said robot and a dowel pin inserted through said holes for locating said tooling plate on said head of said robot.

12. An apparatus in accordance with claim 9 wherein said means for mounting said at least one processing tool to said tooling plate includes a bracket, a bolt and a dowel pin, where the dowel pin is inserted through said bracket into said tooling plate.

13. An apparatus in accordance with claim 9 wherein said tooling plate is substantially circular.

14. An apparatus in accordance with claim 9 wherein said at least one processing tool includes a video camera vertically viewing said at least one work-piece and supported from said tooling plate by a bracket.

15. An apparatus for assembling and processing work-pieces retained on a rotatable pallet for retaining the work-pieces and to be used in conjunction with a robot having a head capable of controlled X, Y, and Z movements, the robot further having a wrist joint attached to an end effector capable of rotation in a horizontal plane, the apparatus comprising:

a. a tooling plate for retaining a plurality of processing tools to perform a plurality of different operations on said work-pieces which are positioned by said robot relative to the plurality of processing tools;

b. means for mounting said tooling plate to said head of said robot such that said tooling plate is fixed; and

c. means for mounting said plurality of processing tools to said tooling plate.

16. An apparatus in accordance with claim 15 wherein said means for mounting said tooling plate to said head further comprises a split clamp tube aligned with and welded to the periphery of a hole on said tooling plate such that the split clamp tube is secured to said head of said robot by tightening a bolt passing through tightening blocks welded adjacent to the split which clamps the split clamp tube to said head of said robot.

17. An apparatus in accordance with claim 15 wherein said means for mounting said plurality of processing tools to said tooling plate includes a plurality of brackets, bolts and dowel pins.

18. An apparatus in accordance with claim 15 wherein said tooling plate is substantially circular.

19. An apparatus in accordance with claim 15 wherein said rotatable pallet is attached to said head of said robot such that said rotatable pallet is below said head of said robot and said tooling plate is attached above and adjacent to said rotatable pallet.

20. An apparatus for performing processing operations on at least one work-piece retained on a rotatable pallet, comprising:

a. a head having a wrist joint attached to an end effector, the head being capable of moving the end effector vertically and rotating the end effector in a horizontal plane;

b. a tooling plate removably mounted to said head;

c. at least one processing tool removably mounted to said tooling plate for performing an operation on said at least one work-piece which is positioned by said head relative to the at least one processing tool; and

d. a gripper holder attached to said end effector of said wrist joint of said head for temporarily gripping said rotatable pallet containing said at least one work-piece such that said at least one work-piece is positioned relative to said at least one processing tool on said tooling plate.