Automated robotic measuring system

• US 7,578,069 B2
• Filed: 12/21/2006
• Issued: 08/25/2009
• Est. Priority Date: 01/14/2004
• Status: Active Grant

• Current Assignee: Hexagon Metrology Incorporated (Hexagon AB)
• Original Assignee: Hexagon Metrology Incorporated (Hexagon AB)
• Inventors: Eaton, Homer
• Primary Examiner(s): Johnson; Amy Cohen
• Application Number:
  US11/614,874
• Publication Number:
  US 20070163134A1
• Time in Patent Office: 978 Days
• Field of Search: 335/03, 33/1.M, 73/17.9, 414/680, 414/735, 901/15, 901/28, 7449001-49006, 31856811-56821, 318/568.25
• US Class Current: 33/503
• CPC Class Codes: G01B 5/004 for measuring coordinates of points
• CPC Class Codes: Y10T 74/20329 Joint between elements

Abstract

An automated coordinate measuring system comprising a measuring arm used for acquisition of geometry data that incorporates an exoskeletal structure resilient to physical perturbations including thermal changes and vibrations which may affect coordinate data acquisition. The system may be adapted to a portable platform allowing for convenient positioning and alignment of the measuring arm in a wide variety of environments.

Claims

1. A positioning system comprising:

an articulated supporting arm comprising a plurality of jointedly interconnected support arm segments moveable about a plurality of axes;

a plurality of compliant members positioned on said supporting arm; and

an articulated measuring arm comprising a plurality of jointedly interconnected measuring arm segments capable of a plurality of degrees of freedom of movement and supported by said compliant members,

wherein said compliant members provide a yielding characteristic that resists a degree of compressibility of each compliant member when a force is applied to one of the articulated supporting arm and the articulated measuring arm, and

wherein at least one support arm segment at least partially encloses at least one measuring arm segment and at least one of said compliant members is positioned between said at least one support arm segment and said at least one measuring arm segment.

2. The positioning system of claim 1, further comprising:

at least one alignment detector configured to detect the alignment between the articulated supporting arm and the articulated measuring arm.

3. The positioning system of claim 1, wherein at least one of the plurality of compliant members is configured to dampen vibration between the articulated supporting arm and the articulated measuring arm.

4. The positioning system of claim 1, wherein at least one of the plurality of compliant members is composed of a thermally insulating material.

5. The positioning system of claim 1, wherein at least one of the compliant members is formed from a resilient deformable material.

6. The positioning system of claim 5, wherein the resilient deformable material comprises one of a soft plastic and a rubber material.

7. The positioning system of claim 1, wherein at least one of the compliant members comprises a bushing.

8. The positioning system of claim 1, wherein at least one support arm segment completely encloses at least one measuring arm segment.

9. A positioning system comprising:

an articulated supporting arm comprising a plurality of jointedly interconnected support arm segments moveable about a plurality of axes;

a plurality of compliant members positioned on said supporting arm;

an articulated measuring arm comprising a plurality of jointedly interconnected measuring arm segments capable of a plurality of degrees of freedom of movement and supported by said compliant members;

a plurality of drive cables connected to the supporting arm and configured to cause a motion of the supporting arm; and

a plurality of motors connected to and configured to control the drive cables.

10. The positioning system of claim 9, further comprising a case comprising the motors such that the motors are positioned a distance from the articulated supporting arm they actuate.

11. The positioning system of claim 9, further comprising sensors on the articulated supporting arm that provided feedback to the actuators to at least partially control the motors.