Motorized inbound laser orientation and wheel recognition station

• US 6,173,213 B1
• Filed: 05/11/1998
• Issued: 01/09/2001
• Est. Priority Date: 05/11/1998
• Status: Expired due to Fees

• Current Assignee: Ellison Machinery Co. (Mitsui & Company Limited)
• Original Assignee: Ellison Machinery Co. (Mitsui & Company Limited)
• Inventors: Perez, Jonathan A., Kuhns, Dennis C., Amiguet, Eugene W.
• Primary Examiner(s): Ellis, Christopher P.
• Assistant Examiner(s): Crawford, Gene O.
• Application Number:
  US09/075,959
• Time in Patent Office: 974 Days
• Field of Search: 700/226, 700/230
• US Class Current: 700/230
• CPC Class Codes: G06F 18/00 Pattern recognition
• CPC Class Codes: G06F 18/20 Analysing

Abstract

The wheel style recognition system for identifying and orienting wheel workpieces includes a wheel style recognition station, a conveyor for delivering a wheel workpiece to the wheel style recognition station, and a wheel orientation sensor that senses the radial orientation of the wheel workpiece on the wheel style recognition station, and generates a radial orientation signal. A wheel mapping sensor scans the wheel workpiece and generates a wheel style mapping signal pattern, while the wheel workpiece is rotated at a steady rate of rotation. A control unit compares the wheel style mapping signal pattern with at least one reference wheel style mapping signal pattern.

Claims

1. A wheel style recognition system for identifying styles of wheel workpieces and orienting the wheel workpieces, the wheel workpieces having a central hub for mounting to an axle of a motor vehicle, a rim portion, and a spoke section connecting the rim portion to the hub, the wheel style recognition system comprising:

a wheel style recognition station;

a conveyor for delivering a wheel workpiece to said wheel style recognition station;

a servomotor for rotating the wheel workpiece in a scanning position at said wheel style recognition station at a steady rate of rotation;

a wheel orientation sensor for sensing the radial orientation of the wheel workpiece on said wheel style recognition station, and for generating a radial orientation signal;

a wheel mapping sensor unit for scanning the wheel workpiece when said servomotor rotates the wheel workpiece and for generating a wheel style mapping signal pattern; and

a control unit for comparing said wheel style mapping signal pattern with at least one reference wheel style mapping signal pattern.

2. The wheel style recognition system of claim 1, wherein said wheel mapping sensor unit comprises a displacement sensing laser sensor that directs a focused laser beam that is reflected from a target to a detector in said sensor.

3. The wheel style recognition system of claim 1, wherein said wheel mapping sensor unit is mounted to a movable arm that can be moved forward to a position over the wheel workpiece to scan the wheel workpiece, and retracted away from the wheel workpiece when the wheel workpiece is moved into or out of said scanning position.

4. The wheel style recognition system of claim 1, wherein said wheel mapping sensor unit comprises a pair of focused laser displacement sensors.

5. The wheel style recognition system of claim 1, wherein said control unit receives a wheel style mapping signal pattern for a plurality of rotations of the wheel workpiece, and determines an averaged mapping signal pattern based upon said wheel style mapping signal pattern for identification of the wheel style.

6. The wheel style recognition system of claim 1, wherein said control unit comprises a memory for storing a wheel style mapping signal pattern as a reference wheel style mapping signal pattern.

7. The wheel style recognition system of claim 1, wherein said control unit further comprises means for transferring the wheel workpiece for further processing in accordance with the specific wheel style of the wheel workpiece if said wheel style mapping signal pattern is determined to be of a recognized wheel style pattern.

8. The wheel style recognition system of claim 1, wherein said control unit is a microprocessor based controller.

9. The wheel style recognition system of claim 1, further comprising a gate for controlling the delivery of the wheel workpieces to said wheel style recognition station by said conveyor.

10. The wheel style recognition system of claim 9, further comprising means for moving said gate between a first position and a second position, said gate in said first position extending into a path of the wheel workpiece on said conveyor to block movement of the wheel workpiece to said wheel style recognition station until the wheel workpiece is to be received by said wheel style recognition station, and said gate in said second position being removed from the path of the wheel workpiece to allow the wheel workpiece to continue to move along said conveyor to said wheel style recognition station.

11. The wheel style recognition system of claim 1, wherein said wheel mapping sensor unit comprises an inner focused laser displacement sensor and an outer focused laser displacement sensor that is radially offset from said inner sensor.

12. The wheel style recognition system of claim 11, wherein said wheel mapping sensor unit inner sensor is positioned radially inward of said outer sensor during scanning, closest to the center of the wheel workpiece and generally over the hub of the wheel workpiece, and said outer sensor is positioned closer to the rim and generally over the area of the spokes of the wheel workpiece.

13. The wheel style recognition system of claim 1, wherein said wheel style recognition station comprises a wheel style recognition platform, and said conveyor delivers the wheel workpiece to said wheel style recognition platform.

14. The wheel style recognition system of claim 13, further comprising a gripper assembly for gripping each wheel workpiece sequentially and positioning each wheel workpiece over said wheel recognition platform.

15. The wheel style recognition system of claim 13, wherein said wheel style recognition station comprises means for moving said wheel style recognition platform between a first position for receiving the wheel workpiece and a second position for scanning of the wheel workpiece.

16. The wheel style recognition system of claim 15, wherein said means for moving said wheel style recognition platform comprises a lift for raising said platform from a lowered first position for receiving the wheel workpiece to a raised second position for scanning of the wheel workpiece, and for lowering said wheel style recognition platform to said lowered first position for receiving another wheel workpiece.

17. The wheel style recognition system of claim 1, wherein said wheel orientation sensor comprises a sensor for detecting a marker on the wheel workpiece.

18. The wheel style recognition system of claim 17, wherein said marker is a raised tab on the rim of the wheel workpiece.

19. The wheel style recognition system of claim 17, wherein said marker is an indentation on the rim of the wheel workpiece.

20. The wheel style recognition system of claim 17, wherein said wheel orientation sensor comprises a displacement sensing laser sensor that directs a focused laser beam that is reflected from said marker to a detector in said sensor.

21. The wheel style recognition system of claim 17, wherein when said marker is oriented directly opposite said wheel orientation sensor, said wheel orientation sensor generates a wheel orientation signal indicating the wheel workpiece has reached a starting position for scanning of the wheel workpiece.

22. A wheel style recognition system for identifying styles of wheel workpieces and orienting the wheel workpieces, the wheel workpieces having a central hub for mounting to an axle of a motor vehicle, a rim portion, and a spoke section connecting the rim portion to the hub, the wheel style recognition system comprising:

a wheel style recognition station;

means for delivering a wheel workpiece to a scanning position at said wheel style recognition station;

means for sensing the radial orientation of the wheel workpiece on said wheel style recognition station, and for generating a wheel orientation signal;

means for scanning the wheel workpiece and for generating a wheel style mapping signal pattern; and

means for comparing said wheel style mapping signal pattern with at least one reference wheel style mapping signal pattern.

23. The wheel style recognition system of claim 22, further comprising means for rotating the wheel workpiece at a steady rate of rotation.

24. The wheel style recognition system of claim 22, wherein said wheel workpiece has a marker, and said means for sensing the radial orientation of the wheel workpiece comprises means for detecting said marker on the wheel workpiece.

25. The wheel style recognition system of claim 22, wherein said means for comparing said wheel style mapping signal pattern with at least one reference wheel style mapping signal pattern further comprises means for comparing a parameter of said wheel orientation signal with a threshold reference value, and for determining that the wheel has reached the desired orientation for commencement of the mapping sequence when said parameter of said wheel orientation signal reaches or exceeds said threshold reference value.

26. The wheel style recognition system of claim 22, wherein said means for scanning the wheel workpiece is mounted to a movable arm that can be moved forward to a position over the wheel workpiece to scan the wheel workpiece, and retracted away from the wheel workpiece when the wheel workpiece is moved into or out of the scanning position.

27. The wheel style recognition system of claim 22, wherein said means for scanning the wheel workpiece comprises a plurality of sensors.

28. The wheel style recognition system of claim 22, further comprises means for transferring the wheel workpiece for further processing in accordance with the specific wheel style of the wheel workpiece if the wheel style mapping signal pattern is determined to be of a recognized wheel style pattern.

29. The wheel style recognition system of claim 22, further comprising means for controlling the positioning of said means for scanning the wheel workpiece.

30. The wheel style recognition system of claim 22, further comprising means for receiving said wheel orientation signal indicating the wheel has reached the starting position for scanning of the wheel from said wheel orientation sensor, and for commanding the commencement of the wheel scanning sequence in response to said wheel orientation signal.

31. The wheel style recognition system of claim 22, wherein said means for delivering a wheel workpiece to a scanning position at said wheel style recognition station comprises gripping means for gripping each wheel workpiece sequentially and positioning each wheel workpiece over said wheel recognition station.

32. The wheel style recognition system of claim 31, further comprising means for controlling said gripping means for gripping a wheel workpiece for scanning.

33. The wheel style recognition system of claim 22, wherein said means for comparing receives a wheel style mapping signal pattern for a full rotation of the wheel workpiece, and determines the mapping signal pattern based upon said full rotation.

34. The wheel style recognition system of claim 33, wherein said means for comparing comprises means for integrating said reference signal over the full rotation of the wheel workpiece, and for comparing the signal with a stored reference pattern.

35. The wheel style recognition system of claim 22, wherein said wheel style recognition station comprises a wheel style recognition platform, and said means for delivering a wheel workpiece delivers the wheel workpiece to said wheel style recognition platform.

36. The wheel style recognition system of claim 35, wherein said wheel style recognition station comprises means for moving said wheel style recognition platform between a first position for receiving the wheel workpiece and a second position for scanning of the wheel workpiece.

37. The wheel style recognition system of claim 35, further comprising means for controlling the positioning of the wheel recognition platform for scanning of the wheel workpiece.

38. The wheel style recognition system of claim 22, further comprising means for controlling the delivery of the wheel workpieces to said wheel style recognition station.

39. The wheel style recognition system of claim 38, wherein said means for controlling the delivery of the wheel workpieces comprises a gate, and further comprising means for moving said gate between a first position and a second position, said gate in said first position extending into a path of the wheel workpiece to block movement of the wheel workpiece to said wheel style recognition station until the wheel workpiece is to be received by said wheel style recognition station, and said gate in said second position being removed from the path of the wheel workpiece to allow the wheel workpiece to continue to move to said wheel style recognition station.

40. The wheel style recognition system of claim 39, further comprising means for controlling movement of said gate.

41. The wheel style recognition system of claim 22, wherein said means for comparing receives and stores said wheel style mapping signal pattern as a reference wheel style mapping signal pattern.

42. The wheel style recognition system of claim 41, wherein said means for comparing stores a plurality of reference wheel style mapping signal patterns.

43. The wheel style recognition system of claim 42, wherein said means for comparing compares each test wheel style mapping signal pattern with a plurality of reference wheel style mapping signal patterns.

44. A method for identifying styles of wheels and orienting the wheels for processing in a motor vehicle wheel processing system, the wheels having a central hub for mounting to an axle of a motor vehicle, a rim portion, and a spoke section connecting the rim portion to the hub;

the motor vehicle wheel processing system including a wheel style recognition station having a wheel recognition platform, a conveyor for delivering a series of wheels to the wheel style recognition station to the wheel recognition platform, a gate movable between a first position blocking movement of wheels onto the wheel recognition platform and a second position removed from the path of the wheels, the method comprising the steps of;

positioning a wheel over said wheel recognition platform;

radially orienting the wheel on said wheel recognition platform and generating a wheel orientation signal indicating the wheel has reached the starting position for scanning of the wheel;

scanning the wheel responsive to said wheel orientation signal and generating a wheel style mapping signal pattern; and

comparing the test wheel style mapping signal pattern with at least one reference wheel style mapping signal pattern.

45. The method of claim 44, wherein said step of positioning a wheel over said wheel recognition platform comprises gripping the wheel.

46. The method of claim 44, wherein said step of positioning a wheel over said wheel recognition platform comprises moving said wheel recognition platform to position the wheel in a wheel screening position.

47. The method of claim 44, wherein said step of radially orienting the wheel on said wheel recognition platform comprises directing a focused laser beam to the wheel, sensing the reflection of the laser beam from the wheel, and generating a wheel orientation signal indicating the wheel has reached the starting position for scanning of the wheel.

48. The method of claim 44, wherein said step of scanning the wheel further comprises rotating the wheel at a steady rate of rotation responsive to said wheel orientation signal.

49. The method of claim 44, wherein said step of scanning the wheel comprises directing a focused laser beam onto the wheel, sensing the reflection of the laser beam from the wheel, and generating a wheel style mapping signal pattern.

50. The method of claim 44, wherein said step of scanning the wheel with a mapping sensor comprises moving said mapping sensor forward to a position over the wheel to scan the wheel, and retracting said mapping sensor away from the wheel when the wheel is moved into or out of the scanning position.

51. The method of claim 44, wherein said mapping sensor comprises inner and outer focused laser displacement sensors, and wherein said step of scanning the wheel with a mapping sensor comprises positioning said inner sensor radially inward of said outer sensor during scanning, closest to the center of the wheel and generally over the hub of the wheel, and positioning said outer sensor closer to the rim and generally over the area of the spokes of the wheel.

52. The method of claim 44, further comprising the step of storing the mapping signal for use as a reference mapping signal pattern.

53. The method of claim 44, wherein said step of comparing the test wheel style mapping signal pattern with at least one reference wheel style mapping signal pattern comprises comparing said mapping signal pattern with a plurality of reference wheel style mapping signal patterns.

54. The method of claim 44, further comprising the step of transferring the wheel for further processing in accordance with the specific wheel type that has been identified if said mapping signal pattern is determined to be of a recognized wheel style pattern, and transferring the wheel to a holding area for further identification and processing if the wheel style is not identified.

55. The method of claim 44, further comprising the step of storing a plurality of wheel style mapping signal patterns as a plurality of reference wheel style mapping signal patterns.

56. The method of claim 44, wherein said step of radially orienting the wheel on said wheel recognition platform comprises rotating the wheel and sensing a marker on the rim of the wheel.

57. The method of claim 56, wherein said step of radially orienting the wheel comprises comparing a parameter of said wheel orientation signal with a threshold reference value, and determining that the wheel has reached the desired orientation for commencement of the mapping sequence when said wheel orientation signal is equal to or greater than said threshold reference value.

58. The method of claim 44, wherein said step of scanning the wheel comprises rotating the wheel a full rotation, and determining the mapping signal pattern based upon said full rotation.

59. The method of claim 58, wherein said step of comparing comprises integrating said reference signal over the full rotation of the wheel, and comparing the signal with a stored reference pattern.

60. The method of claim 44, further comprising the step of storing a wheel style mapping signal pattern as a reference wheel style mapping signal pattern.

61. The method of claim 59, wherein said step of storing said wheel style mapping signal pattern as a reference wheel style mapping signal pattern comprises setting said reference signal pattern at a predetermined percentage of the measured value.

62. A wheel recognition system for identifying a production wheel having a hub at a central position on the wheel and having at least one spoke which is displaced radially outwardly from the hub and which is provided with a particular configuration, including

means for providing a rotation of the wheel at a substantially constant speed,

a sensor disposed at a particular radial position relative to the wheel to direct energy to the wheel and to receive energy reflected from the wheel in accordance with the configuration of the spoke in the wheel at the radial position of the sensor and to produce a signal in accordance with the characteristics of the energy reflected to the sensor,

means for initiating the production of the signal at a particular rotary position of the production wheel during the rotation of the wheel,

means for providing a pattern of signals indicating the characteristics of energy reflected from a spoke configuration on a reference wheel at progressive rotary positions on the wheel at substantially the same radial position as the sensor, and

means for comparing the pattern of the signals produced at the progressive rotary positions of the production wheel and the reference wheel to identify whether the particular configuration of the spoke on the production wheel corresponds to the spoke configuration on the reference wheel.

63. A wheel recognition system as set forth in claim 62 wherein the means for providing the pattern of the signals from the reference wheel provides this pattern at substantially the same speed as the substantially constant speed at which the production wheel is rotated.

64. A wheel recognition system as set forth in claim 62 wherein the rotation means includes a servo for maintaining the rotation of the wheel at the substantially constant speed.

65. A wheel recognition system as set forth in claim 62 wherein

a second sensor is disposed in radially displaced relationship to the first sensor to direct energy to the wheel and to receive energy reflected from the wheel in accordance with the configuration of the spoke at the radial position of the second sensor and to produce a signal in accordance with the characteristics of the signal reflected to the second sensor and wherein

the comparing means compares the pattern of the signals produced at the progressive rotary positions of the production wheel and the reference wheel at the radial position of the second sensor in identifying whether the particular configuration of the spoke on the production wheel corresponds to the spoke configuration of the reference wheel.

66. A wheel recognition system as set forth in claim 65, wherein the rotation means includes a servo for maintaining the rotation of the wheel at the substantially constant speed and wherein

the means for providing the pattern of the signals from the reference wheel provides this pattern at substantially the same speed as the substantially constant speed at which the production wheel is rotated.

67. A wheel recognition system as set forth in claims 65, including

means for providing a particular processing of the production wheel when the production wheel is identified as corresponding to the reference wheel.

68. A method of identifying the spoke configuration of a production wheel, including the steps of:

rotating the production wheel at a substantially constant speed,

providing an indication at a start position of the production wheel,

generating, at progressive rotary positions from the start position, an energy pattern indicative of the spoke configuration of the production wheel at a particular radial distance from the center of the production wheel,

generating at the substantially constant speed an energy pattern at progressive rotary positions of a spoke configuration of a reference wheel at the particular radial distance from the center of the reference wheel, and

comparing the energy patterns of the progressive rotary positions of the production and reference wheels at the particular radial distances from the centers of the wheels to determine if the spoke configuration of the production wheel corresponds to the spoke configuration of the reference wheel.

69. A method as set forth in claim 68, including the step of:

providing for a particular processing of the production wheel when the production wheel is identified as corresponding to the reference wheel.

70. A method as set forth in claim 68, including the steps of:

generating, at progressive rotary positions from the start position, an energy pattern indicative of the spoke configuration of the production wheel at a second radial distance from the center of the production wheel, and

comparing the energy patterns at the progressive rotary positions of the production and reference wheels at the second radial distances from the centers of the wheels to determine if the spoke configuration of the production wheel corresponds to the spoke configuration of the reference wheel.