In-motion dimensioning system for cuboidal objects

• US 5,636,028 A
• Filed: 06/29/1995
• Issued: 06/03/1997
• Est. Priority Date: 06/29/1995
• Status: Expired due to Fees

• Current Assignee: Quantronix Incorporated (Schneider Electric SE)
• Original Assignee: Quantronix Incorporated (Schneider Electric SE)
• Inventors: Stringer, Bradley J., Elwood, Michael K., Badger, Lee W.
• Primary Examiner(s): Rosenberger, Richard A.
• Application Number:
  US08/496,359
• Time in Patent Office: 705 Days
• Field of Search: 356/372, 356/376, 356/379, 356/380, 356/381, 356/383, 356/385, 250/223 R, 250/224, 250/559.24, 207/586
• US Class Current: 356/627
• CPC Class Codes: G01B 11/00 Measuring arrangements characterised by the use of optical techniques
• CPC Class Codes: G01B 11/04 specially adapted for measuring length or width of objects while moving
• CPC Class Codes: G01B 17/00 Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations

Abstract

An in-motion measuring system for determining the length and width of linearly-moving cuboidal objects though the use of object speed, the times during which four light beams oriented across the path of the object are obstructed by the object, and the angles of the light beams with respect to the direction of object movement. The height of an object may also be determined through use of a vertically-extending light curtain with horizontally-oriented light beams, or via an ultrasonic sensor.

Claims

1. An apparatus for measuring the length and width of a linearly-moving cuboidal object traveling at a substantially constant rate along a predetermined path, comprising:

beam emitters for emitting first, second, third and fourth light beams across said path of said linearly-moving object so as to be interrupted by the passage thereof, wherein said beam emitters for emitting said first and second light beams are paired in orthogonal relative orientation, and said beam emitters for emitting said third and fourth light beams are paired in orthogonal relative orientation;

a timing mechanism for determining first, second, third and fourth times during which each of said respective first, second, third and fourth light beams is interrupted by the passage of said object;

a speed sensing mechanism for determining the magnitude of said substantially constant rate; and

a processor for calculating said length and said width of said cuboidal object using said determined first, second, third and fourth times and said magnitude of said rate.

2. The apparatus of claim 1, wherein said timing mechanism for determining said times comprises means for receiving each of said light beams, and a clock associated with said receiving means for measuring first, second, third and fourth time intervals when said first, second, third and fourth light beams are not received by said receiving means.

3. The apparatus of claim 1, wherein said speed sensing mechanism for determining the magnitude of said substantially constant rate comprises:

first and second timing sensors longitudinally spaced along said path of said object at a predetermined distance;

a clock associated with said timing sensors;

said first timing sensor starting said timing sensor clock responsive to passage of a leading edge of said object thereby, and said second timing sensor stopping said clock responsive to the passage of said leading object edge thereby to establish a time interval; and

means for computing said rate magnitude from said time interval and said predetermined distance.

4. The apparatus of claim 3, wherein said timing sensors comprise light beam sensors.

5. The apparatus of claim 1, further including a sensor device for measuring the height of said object.

6. The apparatus of claim 5, wherein said sensor device for measuring the height of said object comprises a vertically extending light curtain employing horizontally-oriented light beams.

7. The apparatus of claim 1, wherein said first and second paired light beams are rotated 45°

about an axis vertically perpendicular to said path of said linearly-moving object with respect to said third and fourth paired light beams.

8. The apparatus of claim 7, wherein said first and third light beams are oriented at 22.5°

angles to said path of said linearly-moving object, and said second and fourth light beams are oriented at 67.5°

angles to said path of said linearly-moving object.

9. The apparatus of claim 8, wherein said first and third light beam emitters are aimed toward a common point, and said second and fourth light beam emitters are aimed toward a common point.

10. The apparatus of claim 9, wherein said first, second, third and fourth light beam emitters are placed on the same side of said path of said linearly-moving object.

11. The apparatus of claim 1, wherein said processor for calculating comprises a microprocessor.

12. The apparatus of claim 1, wherein said light beam emitters are oriented to emit said first, second, third and fourth light beams in one or more parallel planes parallel to the plane of movement of said linearly-moving object.

13. A method for measuring the length and width of a linearly-moving cuboidal object traveling at a substantially constant rate along a predetermined path, comprising:

emitting first, second, third and fourth light beams across the path of said linearly-moving object so as to be interrupted by the passage thereof, wherein said first and second light beams are paired in orthogonal relative orientation, and said third and fourth light beams are paired in orthogonal relative orientation;

determining first, second, third and fourth times during which each of said respective first, second, third and fourth light beams is interrupted by the passage of said object;

determining the magnitude of said substantially constant rate; and

calculating said length and said width of said cuboidal object using said determined first, second, third and fourth times and said magnitude of said rate.

14. The method of claim 13, wherein said determining said times comprises receiving said light beams on the opposite side of said predetermined path from which said light beams are emitted and counting said times when each of said light beams are not received.

15. The method of claim 13, wherein determining the magnitude of said substantially constant rate comprises:

timing the passage of said object over a predetermined interval along said path; and

calculating said rate magnitude from said time of passage and said interval.

16. The method of claim 13, further including measuring the height of said object.

17. The method of claim 16, wherein measuring the height of said object comprises emitting an array of mutually parallel, horizontally oriented light beams at different heights above said path from one side thereof, receiving said mutually parallel light beams on the other side of said path, interrupting one or more of said mutually parallel light beams by passage of said object therethrough, and correlating said object height to the number of mutually parallel light beams interrupted by said object.

18. The method of claim 13, further comprising rotationally locating said first and second paired light beams 45°

about an axis vertically perpendicular to said path of said linearly-moving object with respect to said third and fourth paired light beams.

19. The method of claim 18, further comprising emitting said fast and third light beams at 22.5°

angles to said path of said linearly-moving object and emitting said second and fourth light beams at 67.5°

angles to said path of said linearly-moving object.

20. The method of claim 19, wherein said first and third light beams are emitted toward a common point, and said second and fourth light beams are emitted toward a common point.

21. The method of claim 20, wherein said first, second, third and fourth light beams are emitted from the same side of said path of said linearly-moving object.

22. The method of claim 13, wherein said light beams are oriented in one or more parallel planes parallel to the plane of movement of said linearly-moving object.

23. An apparatus for measuring the length and width of a linearly-moving cuboidal object traveling at a substantially constant rate along a predetermined path, comprising:

beam emitters for emitting first, second, third and fourth light beams across said path of said linearly-moving object so as to be interrupted by the passage thereof, wherein said beam emitters are oriented to emit four light beams in a mutually non-parallel orientation;

a timing mechanism for determining first, second, third and fourth times during which each of said respective first, second, third and fourth light beams is interrupted by the passage of said object;

a speed sensing mechanism for determining the magnitude of said substantially constant rate; and

a processor for calculating said length and said width of said cuboidal object using said determined first, second, third and fourth times and said magnitude of said rate.

24. The apparatus of claim 23, wherein said timing mechanism comprises a light sensitive receiver for each of said light beams, and a clock associated with each of said light sensitive receivers for measuring first, second, third and fourth time intervals when said first, second, third and fourth light beams are not received by said light sensitive receivers.

25. The apparatus of claim 23, wherein said speed sensing mechanism for determining the magnitude of said substantially constant rate comprises:

first and second timing sensors longitudinally spaced along said path of said object at a predetermined distance;

a clock associated with said timing sensors;

said first timing sensor starting said timing sensor clock responsive to passage of a leading edge of said object thereby, and said second timing sensor stopping said clock responsive to the passage of said leading object edge thereby to establish a time interval; and

a processor for computing rate magnitude from said time interval and said predetermined distance.

26. The apparatus of claim 23, further including a mechanism for measuring the height of said object.

27. An apparatus for measuring the length and width of a linearly-moving cuboidal object traveling at a substantially constant rate along a predetermined path, comprising:

beam emitters for emitting first, second, third and fourth light beams across said path of said linearly-moving object so as to be interrupted by the passage thereof, wherein said beam emitters are oriented to emit said four light beams in different, non-perpendicular directions relative to said path;

a timing mechanism for determining first, second, third and fourth times during which each of said respective first, second, third and fourth light beams is interrupted by the passage of said object;

a speed sensing mechanism for determining the magnitude of said substantially constant rate; and

a processor for calculating said length and said width of said cuboidal object using said determined first, second, third and fourth times and said magnitude of said rate.