Apparatus for controlling the temperature of and a moveable, electrically heated object using two way on axis optical communication

• US 5,580,478 A
• Filed: 05/09/1994
• Issued: 12/03/1996
• Est. Priority Date: 05/09/1994
• Status: Expired due to Term

• Current Assignee: CareStream Health Incorporated
• Original Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Inventors: Dunlop, Victoria M., Tanamachi, Steven W.
• Primary Examiner(s): Paschall, Mark H.
• Application Number:
  US08/239,547
• Time in Patent Office: 939 Days
• Field of Search: 219/216, 219/388, 219/482, 219/491, 219/497, 219/501, 219/505, 219/508, 219/502, 355/206, 355/205, 355/282, 355/3 FU, 355/14 FU, 355/285, 340/870.02, 340/870.17, 340/870.03-870.09, 340/870.28
• US Class Current: 219/502
• CPC Class Codes: G01K 13/08 in rotary movement
• CPC Class Codes: G03G 15/2039 with means for controlling the fixing temperature
• CPC Class Codes: G05D 23/1905 associated with tele control
• CPC Class Codes: G05D 23/24 the sensing element having a resistance varying with temperature, e.g. a thermistor

Abstract

Temperature control apparatus for controlling the temperature of an electrically heated moveable object such as an electrically heated rotatable drum. A temperature control mechanism, rotatably mounted in conjunction with the cylindrical drum and electrically coupled to the electrical heater, controls the temperature by controlling the flow of electricity to the electrical heater in response to control signals. A temperature sensor mechanism, rotatably mounted in conjunction with the cylindrical drum and electrically coupled to the temperature sensor, senses the temperature of the surface of the cylindrical drum and produces temperature signals indicative thereof. A microprocessor, non-rotatably mounted with respect to the cylindrical drum, controls the temperature of the electrically heated drum by generating the control signals in response to the temperature signals. An optical mechanism, coupled to the temperature control means, the temperature sensor means and the microprocessor means, optically couples the temperature signals from the rotating temperature sensor means to the non-rotating microprocessor means and optically couples the control signals from the non-rotating microprocessor means to the rotating temperature control means.

Claims

1. A temperature controlled, electrically heated drum, comprising:

a cylindrical drum having a surface and being rotatable on an axis;

an electrical heater thermally coupled to said surface of said cylindrical drum;

temperature control means, rotatably mounted in conjunction with said cylindrical drum and electrically coupled to said electrical heater, for controlling the temperature by controlling the flow of electricity to said electrical heater in response to control signals;

a temperature sensor thermally coupled to said surface of said cylindrical drum;

temperature sensor means, rotatably mounted in conjunction with said cylindrical drum and electrically coupled to said temperature sensor, for sensing the temperature of said surface of said cylindrical drum and producing temperature signals indicative thereof;

microprocessor means, non-rotatably mounted with respect to said cylindrical drum, for controlling said temperature of said electrically heated drum by generating said control signals in response to said temperature signals; and

optical means, coupled to said temperature control means, said temperature sensor means and said microprocessor means, for continuously aligning and optically coupling said temperature signals from said rotating temperature sensor means to said non-rotating microprocessor means and for continuously optically coupling said control signals from said non-rotating microprocessor means to said rotating temperature control means;

said optical means being mounted on said axis providing on-axis optical communication.

2. A temperature control apparatus as in claim 1 wherein said electrical heaters are adapted to be electro-mechanically coupled to a non-rotatable external power supply.

3. A temperature control apparatus as in claim 2 wherein said first and second optical generating means and said first and second optical receiving means are synchronized through the use of a common synchronization signal.

4. A temperature control apparatus as in claim 3 wherein said common synchronization signal is derived from said external power supply.

5. A temperature control apparatus as in claim 4 wherein said first optical signals comprise a series of synchronization bits followed by a combination of data bits and further synchronization bits.

6. A temperature control apparatus as in claim 5 wherein said second optical signals are frequency modulated to be indicative of said temperature of said cylindrical drum.

7. A temperature controlled, electrically heated drum, comprising:

a cylindrical drum rotatable on an axis, said drum having an outer surface divided into a plurality of zones arranged longitudinally along said axis of said drum;

a plurality of electrical heaters, one for each of said plurality of zones, thermally coupled to each of said plurality of zones, respectively;

temperature control means, rotatably mounted in conjunction with said cylindrical drum and electrically coupled to said plurality of electrical heaters, for controlling the temperature by controlling the flow of electricity to said electrical heaters in response to control signals;

a plurality of temperature sensors, one for each of said plurality of zones, thermally coupled to each of said plurality of zones, respectively;

temperature sensor means, rotatably mounted in conjunction with said cylindrical drum and electrically coupled to said plurality of temperature sensors, for sensing the temperature of each of said plurality of zones of said surface of said cylindrical drum and producing temperature signals indicative thereof;

microprocessor means, non-rotatably mounted with respect to said cylindrical drum, for controlling said temperature of said electrically heated drum by generating said control signals in response to said temperature signals; and

optical means, coupled to said temperature control means, said temperature sensor means and said microprocessor means, for continuously aligning and optically coupling said temperature signals from said rotating temperature sensor means to said non-rotating microprocessor means and for continuously optically coupling said control signals from said non-rotating microprocessor means to said rotating temperature control means;

said optical means being mounted on said axis providing on-axis optical communication.

11. A temperature control apparatus as in claim 7 wherein said first optical signals comprise and series of synchronization bits followed by a combination of data bits and further synchronization bits.

12. A temperature control apparatus as in claim 11 wherein said second optical signals are frequency modulated to be indicative of said temperature of said cylindrical drum.

13. A temperature control apparatus adapted to control the temperature of a cylindrical drum rotatable on an axis, said drum having an outer surface divided into a plurality of zones arranged longitudinally along said axis, said cylindrical drum having a plurality of electrical heaters, one for each of said plurality of zones, thermally coupled to each of said plurality of zones, said cylindrical drum having a plurality of temperature sensors, one for each of said plurality of zones, thermally coupled to each of said plurality of zones, respectively, said temperature control apparatus comprising:

temperature control means, rotatably mounted in conjunction with said cylindrical drum and electrically coupled to said plurality of electrical heaters, for controlling the temperature by controlling the flow of electricity to said electrical heaters in response to control signals;

temperature sensor means, rotatably mounted in conjunction with said cylindrical drum and electrically coupled to said plurality of temperature sensors, for sensing the temperature of each of said plurality of zones of said surface of said cylindrical drum and producing temperature signals indicative thereof;

microprocessor means, non-rotatably mounted with respect to said cylindrical drum, for controlling said temperature of said electrically heated drum by generating said control signals in response to said temperature signals; and

optical means, coupled to said temperature control means, said temperature sensor means and said microprocessor means, for continuously aligning and optically coupling said temperature signals from said rotating temperature sensor means to said non-rotating microprocessor means and for continuously optically coupling said control signals from said non-rotating microprocessor means to said rotating temperature control means;

said optical means being mounted on said axis providing on-axis optical communication.

8. A temperature control apparatus as in claim 17 wherein said electrical heaters are adapted to be electro-mechanically coupled to a non-rotatable external power supply.

9. A temperature control apparatus as in claim 8 wherein said first and second optical generating means and said first and second optical receiving means are synchronized through the use of a common synchronization signal.

10. A temperature control apparatus as in claim 9 wherein said common synchronization signal is derived from said external power supply.

14. A temperature control apparatus as in claim 13 wherein said electrical heaters are adapted to be electro-mechanically coupled to a non-rotatable external power supply.

15. A temperature control apparatus as in claim 14 wherein said first and second optical generating means and said first and second optical receiving means are synchronized through the use of a common synchronization signal.

16. A temperature control apparatus as in claim 15 wherein said common synchronization signal is derived from said external power supply.

17. A temperature control apparatus as in claim 16 wherein said first optical signals comprise and series of synchronization bits followed by a combination of data bits and further synchronization bits.

18. A temperature control apparatus as in claim 17 wherein said second optical signals are frequency modulated to be indicative of said temperature of said cylindrical drum.

19. A temperature control apparatus adapted to control the temperature of a movable object, said object having an electrical heater thermally coupled to said object and having a plurality of temperature sensors thermally coupled to said object, said temperature control apparatus comprising:

temperature control means, movably mounted in conjunction with said object and electrically coupled to said electrical heater, for controlling the temperature of said object by controlling the flow of electricity to said electrical heater in response to a control signal;

temperature sensor means, movably mounted in conjunction with said object and electrically coupled to said temperature sensor, for sensing the temperature of said object and producing a temperature signal indicative thereof;

microprocessor means, stationary with respect to said object, for controlling said temperature of said object by generating said control signal in response to said temperature signal; and

optical means, coupled to said temperature control means, said temperature sensor means and said microprocessor means, for continuously aligning and optically coupling said temperature signals from said movable temperature sensor means to said stationary microprocessor means and for continuously optically coupling said control signal from said stationary microprocessor means to said movable temperature control means;

said optical means being mounted on said axis providing on-axis optical communication.

20. A temperature control apparatus as in claim 19 wherein said electrical heaters are adapted to be electro-mechanically coupled to a non-rotatable external power supply.

21. A temperature control apparatus as in claim 20 wherein said first and second optical generating means and said first and second optical receiving means are synchronized through the use of a common synchronization signal.

22. A temperature control apparatus as in claim 21 wherein said common synchronization signal is derived from said external power supply.

23. A temperature control apparatus as in claim 22 wherein said first optical signals comprise and series of synchronization bits followed by a combination of data bits and further synchronization bits.

24. A temperature control apparatus as in claim 23 wherein said second optical signals are frequency modulated to be indicative of said temperature of said cylindrical drum.

25. A temperature control apparatus adapted to control the temperature of a cylindrical drum rotatable on an axis, said drum having an outer surface divided into a plurality of zones arranged longitudinally along said axis, said cylindrical drum having a plurality of electrical heaters, one for each of said plurality of zones, thermally coupled to each of said plurality of zones, said cylindrical drum having a plurality of temperature sensors, one for each of said plurality of zones, thermally coupled to each of said plurality of zones, respectively, said temperature control apparatus comprising:

temperature control means, rotatably mounted in conjunction with said cylindrical drum and electrically coupled to said plurality of electrical heaters, for controlling the temperature by controlling the flow of electricity to said electrical heaters in response to drum control signals;

temperature sensor means, rotatably mounted in conjunction with said cylindrical drum and electrically coupled to said plurality of temperature sensors, for sensing the temperature of each of said plurality of zones of said surface of said cylindrical drum and producing drum temperature signals indicative thereof;

microprocessor means, non-rotatably mounted with respect to said cylindrical drum, for controlling said temperature of said electrically heated drum by generating said microprocessor control signals in response to microprocessor temperature signals; and

first optical generating means, non-rotatably mounted on said axis of said cylindrical drum, for receiving said microprocessor control signals and generating first optical signals in response thereto;

first optical receiving means, rotatably mounted near said axis of said cylindrical drum, for continuously receiving said first digitally modulated optical signals and converting said first optical signals to said drum control signals;

second optical generating means, rotatably mounted on said axis of said cylindrical drum, for receiving said drum temperature signals and generating second optical signals in response thereto;

second optical receiving means, non-rotatably mounted near said axis of said cylindrical drum, for continuously receiving said second digitally modulated optical signals and converting said second optical signals to said microprocessor temperature signals.

26. A temperature control apparatus as in claim 25 wherein said electrical heaters are adapted to be electro-mechanically coupled to a non-rotatable external power supply.

27. A temperature control apparatus as in claim 26 wherein said first and second optical generating means and said first and second optical receiving means are synchronized through the use of a common synchronization signal.

28. A temperature control apparatus as in claim 27 wherein said common synchronization signal is derived from said external power supply.

29. A temperature control apparatus as in claim 28 wherein said first optical signals comprise and series of synchronization bits followed by a combination of data bits and further synchronization bits.

30. A temperature control apparatus as in claim 29 wherein said second optical signals are frequency modulated to be indicative of said temperature of said cylindrical drum.

31. A temperature controlled, electrically heated drum, comprising:

a cylindrical drum having a surface and being rotatable on an axis;

an electrical heater thermally coupled to said surface of said cylindrical drum;

temperature control means, rotatably mounted in conjunction with said cylindrical drum and electrically coupled to said electrical heater, for controlling the temperature by controlling the flow of electricity to said electrical heater in response to control signals;

a temperature sensor thermally coupled to said surface of said cylindrical drum;

temperature sensor means, rotatably mounted in conjunction with said cylindrical drum and electrically coupled to said temperature sensor, for sensing the temperature of said surface of said cylindrical drum and producing temperature signals indicative thereof;

interface means, non-rotatably mounted with respect to said cylindrical drum, for providing interface to said temperature control means by generating said control signals; and

optical means, coupled to said temperature control means, said temperature sensor means and said microprocessor means, for continuously aligning and optically coupling said temperature signals from said rotating temperature sensor means to said non-rotating microprocessor means and for continuously optically coupling said control signals from said non-rotating microprocessor means to said rotating temperature control means;

said optical means being mounted on said axis providing on-axis optical communication.

32. A temperature control apparatus as in claim 31 wherein said electrical heaters are adapted to be electro-mechanically coupled to a non-rotatable external power supply.

33. A temperature control apparatus as in claim 32 wherein said first and second optical generating means and said first and second optical receiving means are synchronized through the use of a common synchronization signal.

34. A temperature control apparatus as in claim 33 wherein said common synchronization signal is derived from said external power supply.

35. A temperature control apparatus as in claim 34 wherein said first optical signals comprise and series of synchronization bits followed by a combination of data bits and further synchronization bits.

36. A temperature control apparatus as in claim 35 wherein said second optical signals are frequency modulated to be indicative of said temperature of said cylindrical drum.

37. A temperature controlled, electrically heated drum, comprising:

a cylindrical drum rotatable on an axis, said drum having an outer surface divided into a plurality of zones arranged longitudinally along said axis of said drum;

a plurality of electrical heaters, one for each of said plurality of zones, thermally coupled to each of said plurality of zones, respectively;

temperature control means, rotatably mounted in conjunction with said cylindrical drum and electrically coupled to said plurality of electrical heaters, for controlling the temperature by controlling the flow of electricity to said electrical heaters in response to control signals;

a plurality of temperature sensors, one for each of said plurality of zones, thermally coupled to each of said plurality of zones, respectively;

temperature sensor means, rotatably mounted in conjunction with said cylindrical drum and electrically coupled to said plurality of temperature sensors, for sensing the temperature of each of said plurality of zones of said surface of said cylindrical drum and producing temperature signals indicative thereof;

interface means, non-rotatably mounted with respect to said cylindrical drum, for providing interface to said temperature control means by providing said control signals; and

optical means, coupled to said temperature control means, said temperature sensor means and said microprocessor means, for continuously aligning and optically coupling said temperature signals from said rotating temperature sensor means to said non-rotating microprocessor means and for continuously optically coupling said control signals from said non-rotating microprocessor means to said rotating temperature control means;

said optical means being mounted on said axis providing on-axis optical communication.

38. A temperature control apparatus as in claim 37 wherein said electrical heaters are adapted to be electro-mechanically coupled to a non-rotatable external power supply.

39. A temperature control apparatus as in claim 38 wherein said first and second optical generating means and said first and second optical receiving means are synchronized through the use of a common synchronization signal.

40. A temperature control apparatus as in claim 39 wherein said common synchronization signal is derived from said external power supply.

41. A temperature control apparatus as in claim 40 wherein said first optical signals comprise and series of synchronization bits followed by a combination of data bits and further synchronization bits.

42. A temperature control apparatus as in claim 41 wherein said second optical signals are frequency modulated to be indicative of said temperature of said cylindrical drum.

43. A temperature control apparatus adapted to control the temperature of a cylindrical drum rotatable on an axis, said drum having an outer surface divided into a plurality of zones arranged longitudinally along said axis, said cylindrical drum having a plurality of electrical heaters, one for each of said plurality of zones, thermally coupled to each of said plurality of zones, said cylindrical drum having a plurality of temperature sensors, one for each of said plurality of zones, thermally coupled to each of said plurality of zones, respectively, said temperature control apparatus comprising:

temperature control means, rotatably mounted in conjunction with said cylindrical drum and electrically coupled to said plurality of electrical heaters, for controlling the temperature by controlling the flow of electricity to said electrical heaters in response to control signals;

temperature sensor means, rotatably mounted in conjunction with said cylindrical drum and electrically coupled to said plurality of temperature sensors, for sensing the temperature of each of said plurality of zones of said surface of said cylindrical drum and producing temperature signals indicative thereof;

interface means, non-rotatably mounted with respect to said cylindrical drum, for providing interface to said temperature control means by generating said control signals; and

optical means, coupled to said temperature control means, said temperature sensor means and said microprocessor means, for continuously aligning and optically coupling said temperature signals from said rotating temperature sensor means to said non-rotating microprocessor means and for continuously optically coupling said control signals from said non-rotating microprocessor means to said rotating temperature control means;

said optical means being mounted on said axis providing on-axis optical communication.

44. A temperature control apparatus as in claim 43 wherein said electrical heaters are adapted to be electro-mechanically coupled to a non-rotatable external power supply.

45. A temperature control apparatus as in claim 44 wherein said first and second optical generating means and said first and second optical receiving means are synchronized through the use of a common synchronization signal.

46. A temperature control apparatus as in claim 45 wherein said common synchronization signal is derived from said external power supply.

47. A temperature control apparatus as in claim 46 wherein said first optical signals comprise and series of synchronization bits followed by a combination of data bits and further synchronization bits.

48. A temperature control apparatus as in claim 47 wherein said second optical signals are frequency modulated to be indicative of said temperature of said cylindrical drum.

49. A temperature control apparatus adapted to control the temperature of a movable object, said object having an electrical heater thermally coupled to said object and having a plurality of sensors operatively coupled to said object, said temperature control apparatus comprising:

temperature control means, movably mounted in conjunction with said object and electrically coupled to said electrical heater, for controlling the temperature of said object by controlling the flow of electricity to said electrical heater in response to a control signal;

sensor means, movably mounted in conjunction with said object and electrically coupled to said sensor, for sensing the status of said object and producing a status signal indicative thereof;

interface means, stationary with respect to said object, for providing interface to said temperature control means by generating said control signal; and

optical means, coupled to said temperature control means, said temperature sensor means and said microprocessor means, for continuously aligning and optically coupling said temperature signals from said movable temperature sensor means to said stationary microprocessor means and for continuously optically coupling said control signal from said stationary microprocessor means to said movable temperature control means;

said optical means being mounted on said axis providing on-axis optical communication.

50. A temperature control apparatus as in claim 49 wherein said electrical heaters are adapted to be electro-mechanically coupled to a non-rotatable external power supply.

51. A temperature control apparatus as in claim 50 wherein said first and second optical generating means and said first and second optical receiving means are synchronized through the use of a common synchronization signal.

52. A temperature control apparatus as in claim 51 wherein said common synchronization signal is derived from said external power supply.

53. A temperature control apparatus as in claim 52 wherein said first optical signals comprise and series of synchronization bits followed by a combination of data bits and further synchronization bits.

54. A temperature control apparatus as in claim 53 wherein said second optical signals are frequency modulated to be indicative of said temperature of said cylindrical drum.

55. A temperature control apparatus adapted to control the temperature of a cylindrical drum rotatable on an axis, said drum having an outer surface divided into a plurality of zones arranged longitudinally along said axis, said cylindrical drum having a plurality of electrical heaters, one for each of said plurality of zones, thermally coupled to each of said plurality of zones, said cylindrical drum having a plurality of temperature sensors, one for each of said plurality of zones, thermally coupled to each of said plurality of zones, respectively, said temperature control apparatus comprising:

temperature control means, rotatably mounted in conjunction with said cylindrical drum and electrically coupled to said plurality of electrical heaters, for controlling the temperature by controlling the flow of electricity to said electrical heaters in response to drum control signals;

temperature sensor means, rotatably mounted in conjunction with said cylindrical drum and electrically coupled to said plurality of temperature sensors, for sensing the temperature of each of said plurality of zones of said surface of said cylindrical drum and producing drum temperature signals indicative thereof;

interface means, non-rotatably mounted witch respect to said cylindrical drum, for providing interface to said temperature control means by generating said interface control signals; and

first optical generating means, non-rotatably mounted on said axis of said cylindrical drum, for receiving said interface control signals and generating first optical signals in response thereto;

first optical receiving means, rotatably mounted near said axis of said cylindrical drum, for continuously receiving said first digitally modulated optical signals and converting said first optical signals to said drum control signals;

second optical generating means, rotatably mounted on said axis of said cylindrical drum, for receiving said drum temperature signals and generating second optical signals in response thereto;

second optical receiving means, non-rotatably mounted near said axis of said cylindrical drum, for continuously receiving said second digitally modulated optical signals and converting said second optical signals to said interface temperature signals.

56. A temperature control apparatus as in claim 55 wherein said electrical heaters are adapted to be electro-mechanically coupled to a non-rotatable external power supply.

57. A temperature control apparatus as in claim 56 wherein said first and second optical generating means and said first and second optical receiving means are synchronized through the use of a common synchronization signal.

58. A temperature control apparatus as in claim 57 wherein said common synchronization signal is derived from said external power supply.

59. A temperature control apparatus as in claim 58 wherein said first optical signals comprise and series of synchronization bits followed by a combination of data bits and further synchronization bits.

60. A temperature control apparatus as in claim 59 wherein said second optical signals are frequency modulated to be indicative of said temperature of said cylindrical drum.