Motorized window shade system

• US 5,848,634 A
• Filed: 12/27/1996
• Issued: 12/15/1998
• Est. Priority Date: 12/27/1996
• Status: Expired due to Term

• Current Assignee: Lutron Technology Company LLC
• Original Assignee: Lutron Electronics Company Incorporated (Lutron Electronics)
• Inventors: Newman, Robert C. Jr., Mayo, Noel, Martin, Gregory R., Moseley, Robin C., Hausman, Donald F. Jr., Azar, Tony W., Lynn, Stephen W., Digney, Charles J. Jr., Cieri, Mark A., Reinhard, Timothy R., Kates, David L., Will, Gary E.
• Primary Examiner(s): Purol, David M.
• Application Number:
  US08/773,184
• Time in Patent Office: 718 Days
• Field of Search: 160/310, 160/311, 160/312, 160/120, 160/241, 160/323.1, 160/405, 160/903, 160/1, 160/7
• US Class Current: 160/310
• CPC Class Codes: E06B 2009/6836 sensing obstacle
• CPC Class Codes: E06B 2009/6845 sensing position
• CPC Class Codes: E06B 2009/6872 using counters to determine shutter position
• CPC Class Codes: E06B 2009/689 using end switches
• CPC Class Codes: E06B 9/174 Bearings specially adapted therefor
• CPC Class Codes: E06B 9/68 Operating devices or mechanisms, e.g. with electric drive
• CPC Class Codes: E06B 9/70 comprising an electric motor positioned outside the roller
• CPC Class Codes: E06B 9/88 for limiting unrolling
• CPC Class Codes: G05B 19/0426 Programming the control sequence

Abstract

An elongated reelable shade, first and second spaced support brackets removably connected to first and second and opposite ends of the elongated reelable shade for supporting the reelable shade from a fixed support, an electrical drive motor having an output shaft for rotating the elongated reelable shade around its axis to selectively reel and unreel the shade, an electrical circuit for energizing and operating the motor, the electrical circuit including a controller coupled to and controlling the operation of the drive motor, a single shade limit switch for stopping the motor when the shade reaches a fully reeled or fully extended position, and a coupler for removably coupling the output shaft of the motor to the first end of the elongated reelable shade, a single housing having the first bracket fixed thereto, the single housing containing and supporting the motor, the electrical circuit and the coupler, the coupler comprising an output driver which removably receives the first end of the shade with rotatable driving relationship.

Claims

1. In combination:

an elongated reelable shade comprising first and second opposite ends, first and second spaced support brackets, said second support bracket being removably connected to said second end of said elongated reelable shade for supporting said reelable shade from a fixed support, an electrical drive motor having an output shaft for rotating said elongated reelable shade around its axis to selectively reel and unreel said shade, an electrical circuit for energizing and operating said motor, the electrical circuit including a controller coupled to and controlling the operation of said motor, and a coupler for removably coupling said output shaft of said motor to said first end of said elongated reelable shade, a single housing having said first bracket fixed thereto, said single housing containing and supporting said motor, said electrical circuit and said coupler, said coupler comprising an output driver which removably receives said first end of said shade with rotatable driving relationship, and further including a single shade limit switch with a single shade limit switch actuator positioned adjacent the path of said shade as said shade reels and unreels;

said switch being coupled to said controller and being operated in response to the movement of said shade to a first extreme position and a second extreme position whereby, when either of said first or second extreme positions is reached, said switch is operated and said motor is stopped.

2. The combination of claim 1 wherein, to mount said reelable shade, said first and second brackets are fixed to said fixed support and said first and second ends of said shade are connected to and supported by said output driver of said coupler and said second bracket respectively.

3. The combination of claim 1 wherein said fixed support has a vertical surface area which is covered and uncovered by the unreeling and reeling respectively of said shade.

4. The combination of claim 1 wherein said elongated reelable shade is a window shade and wherein said fixed support includes a window frame.

5. The combination of claim 4 wherein said first bracket has first and second sets of mounting openings disposed to mount said first bracket on at least one of inside and outside surfaces of said window frame.

6. The combination of claim 1 wherein said electrical motor is a reversible DC motor.

7. The combination of claim 6 wherein said electrical circuit includes a power supply, an H bridge motor drive circuit coupled between said power supply and said motor, a pulse width modulator circuit for controlling output power of said H bridge circuit, a motor rotation sensor for sensing a rotational speed and direction of rotation of said drive motor shaft, and a microprocessor coupled to said sensor for adjusting the operation of said pulse width modulator and said H bridge circuit according to a predetermined control sequence.

8. The combination of claim 7 which further includes a permanent magnet rotating with said drive motor output shaft, and at least first and second spaced Hall effect sensors disposed adjacent said permanent magnet for producing outputs related to the rotational speed and direction of rotation of said drive motor output shaft.

9. The combination of claim 7 which further includes a flat, gear reduction assembly having an input gear on said motor output shaft coupled to an output gear on a gear output shaft which is parallel to and laterally removed from said motor output shaft and connected to said coupler.

10. The combination of claim 7 which further includes an infrared radiation sensor fixed to said housing and coupled to said control whereby said motor can be operated in response to the reception of infrared radiation from an external source.

11. The combination of claim 6 which further includes a permanent magnet rotating with said drive motor output shaft, and at least first and second spaced Hall effect sensors disposed adjacent said permanent magnet for producing outputs related to the rotational speed and direction of rotation of said drive motor output shaft.

12. The combination of claim 11 which further includes a flat, gear reduction assembly having an input gear on said motor output shaft coupled to an output gear on a gear output shaft which is parallel to and laterally removed from said motor output shaft and connected to said coupler.

13. The combination of claim 11, wherein said electrical circuit is disposed on a printed circuit board, said Hall effect sensors being mounted on said printed circuit board.

14. The combination of claim 13, wherein the permanent magnet rotating with said drive motor output shaft extends through an aperture in said printed circuit board, the Hall effect sensors being disposed adjacent said aperture.

15. The combination of claim 6 which further includes a radiation sensor fixed to said housing and coupled to said control whereby said motor can be operated in response to the reception of radiation from an external source.

16. The combination of claim 1 wherein said elongated reelable shade is a conventional roller shade having a support pin fixed to its said second end, which support pin is rotatably receivable by said second bracket;

said reelable shade having a coupling socket fixed to said first end thereof which is removably connectable to said coupler.

17. The combination of claim 1 which further includes a flat, gear reduction assembly having an input gear on said motor output shaft coupled to an output gear on a gear output shaft which is parallel to and laterally removed from said motor output shaft and connected to said coupler.

18. The combination of claim 17 wherein said coupler comprises a hexagonal ball formed on said gear reduction assembly output shaft to be coupled to said first end of said elongated reelable shade and a hexagonal socket fixed to said first end of said elongated reelable shade for releasably receiving said hexagonal ball despite angular misalignment between the axis of rotation of said hexagonal ball and the axis of rotation of said reelable shade.

19. The combination of claim 1, wherein said shade limit switch actuator includes a pivotally mounted shade limit lever arm;

said shade limit lever arm having an end disposed adjacent the path of movement of said shade;

the free end of said shade having an enlarged hem liner along its edge, said hem liner at the free end of said shade engaging and rotating said shade limit lever arm when said free end of said shade reaches said shade limit lever arm while said shade is being reeled.

20. The combination of claim 19 wherein said shade limit switch actuator includes a pivotally mounted shade full extension limit lever arm;

said shade full extension limit lever arm having an end disposed adjacent to but spaced from the outer periphery of said reelable shade and being removed from the path of said shade when said shade is being unreeled from over one side of the shade reel, but being disposed in the path of said shade after said shade has been fully unreeled and when continuous unreeling causes said shade to reel in an opposite direction over the shade reel, thereby to activate said shade limit switch to stop said motor.

21. The combination of claim 20, wherein said pivotally mounted shade limit and shade full extension limit arms comprise first and second arms of a single pivotally mounted lever.

22. The combination of claim 21 wherein said first and second arms are disposed at an approximate right angle to one another.

23. The combination of claim 20, wherein said controller includes "raise" and "lower" switches for manually actuating the drive motor.

24. The combination of claim 1, wherein said shade limit switch actuator includes a pivotally mounted shade full extension limit lever arm;

said shade full extension limit lever arm having an end disposed adjacent to but spaced from the outer periphery of said reelable shade and being removed from the path of said shade when said shade is being unreeled from over one side of the shade reel, but being disposed in the path of said shade after said shade has been fully unreeled and when continuous unreeling causes said shade to reel in an opposite direction over the shade reel, thereby to activate said shade limit switch to stop said motor.

25. The combination of claim 1 wherein said electrical circuit includes a power supply, an H bridge motor drive circuit coupled between said power supply and said motor, a pulse width modulator circuit for controlling output power of said H bridge circuit, a motor rotation sensor for sensing the rotational speed and direction of rotation of said drive motor shaft, and a microprocessor coupled to said sensor for adjusting the operation of said pulse width modulator and said H bridge according to a predetermined control sequence.

26. The combination of claim 25 wherein said shade limit switch actuator includes a pivotally mounted shade limit lever arm;

said shade limit lever arm having an end disposed adjacent the path of movement of said shade;

the free end of said shade having an enlarged hem liner along its edge, said hem liner at the free end of said shade engaging and rotating said shade limit lever arm when said free end of said shade reaches said shade limit lever arm while said shade is being reeled.

27. The combination of claim 26 wherein said shade limit switch actuator includes a pivotally mounted shade full extension limit lever arm;

said shade full extension limit lever arm having an end disposed adjacent to but spaced from the outer periphery of said reelable shade and being removed from the path of said shade when said shade is being unreeled from over one side of the shade reel, but being disposed in the path of said shade after said shade has been fully unreeled and when continuous unreeling causes said shade to reel in an opposite direction over the shade reel, thereby to activate said shade limit switch to stop said motor.

28. The combination of claim 27, wherein said pivotally mounted shade limit and shade full extension limit arms being first and second arms of a single pivotally mounted lever.

29. The combination of claim 25 wherein said shade limit switch actuator includes a pivotally mounted shade full extension limit lever arm;

said shade full extension limit lever arm having an end disposed adjacent to but spaced from the outer periphery of said reelable shade and being removed from the path of said shade when said shade is being unreeled from over one side of the shade reel, but being disposed in the path of said shade after said shade has been fully unreeled and when continuous unreeling causes said shade to reel in an opposite direction over the shade reel, thereby to activate said shade limit switch to stop said motor.

30. The combination of claim 1 which further includes a radiation sensor fixed to said housing and coupled to said control whereby said motor can be operated in response to the reception of radiation from an external source.

31. The combination of claim 30 wherein the radiation sensor comprises an infrared sensor.

32. The combination of claim 1, further comprising a brake for preventing said reelable shade from unreeling downwardly due to the weight of an unwound portion of said reelable shade.

33. The combination of claim 32, wherein said brake comprises a permanent magnet on said motor shaft and a permanent magnet fixed to said housing and in general alignment with the permanent magnet on the motor shaft.

34. The combination of claim 1, wherein said controller includes "raise" and "lower" switches for manually actuating the drive motor.

35. The combination of claim 34, wherein said raise and lower switches comprise a switch coupled to said controller and disposed in said housing, an extending member being provided for manual grasping by a user to control said switch to drive the motor to at least one of raise and lower the shade.

36. The combination of claim 35, wherein the extending member is rotated in a first direction to raise the shade and in a second direction to lower the shade.

37. The combination of claim 34, wherein said raise and lower switches are provided at an end of a member extending downwardly from said housing.

38. The combination of claims 37, where said member extending downwardly comprises a conduit with wires coupling said raise and lower switches to said controller being provided in a hollow interior of said conduit.

39. The combination of claim 38, wherein said housing has a modular telephone jack having connectors coupled to said controller for controlling said drive motor and said wires from said raise and lower switches are coupled to said controller by a modular telephone plug that plugs into said modular telephone jack, thereby to control said drive motor.

40. The combination of claim 1, wherein the controller further includes an address selector for setting a unique address for the combination.

41. In combination:

an elongated reelable shade comprising first and second opposite ends, first and second spaced support brackets, said second support bracket being removably connected to said second end of said elongated reelable shade for supporting said reelable shade from a fixed support, an electrical drive motor having an output shaft for rotating said elongated reelable shade around its axis to selectively reel and unreel said shade, an electrical circuit for energizing and operating said motor, the electrical circuit including a controller coupled to and controlling the operation of said motor, and a coupler for removable coupling said output shaft of said motor to said first end of said elongated reelable shade, a single housing having said first bracket fixed thereto, said single housing containing and supporting said motor, said electrical circuit and said coupler, said coupler comprising an output driver which removable receives said first end of said shade with rotatable driving relationship,

the fixed support having a vertical surface area which is covered and uncovered by the unreeling and reeling respectively of said shade,

and further wherein said electric motor is a multi-pole permanent magnet reversible DC motor, and wherein said motor has a cogging force at multiple angular positions of said output shaft when said motor is deenergized, which cogging force is sufficient to overcome a rotational force produced on said reelable shade due to the weight of a downwardly hanging portion of an unreeled shade.

42. The combination of claim 41 which further includes a flat, gear reduction assembly having an input gear on said motor output shaft coupled to an output gear on a gear output shaft which is parallel to and laterally removed from said motor output shaft and connected to said coupler.

43. In combination:

an elongated reelable shade comprising first and second opposite ends, first and second spaced support brackets, said second support bracket being removably connected to said second end of said elongated reelable shade for supporting said reelable shade from a fixed support, an electrical drive motor having an output shaft for rotating said elongated reelable shade around its axis to selectively reel and unreel said shade, an electrical circuit for energizing and operating said motor, the electrical circuit including a controller coupled to and controlling the operation of said motor, and a coupler for removably coupling said output shaft of said motor to said first end of said elongated reelable shade, a single housing having said first bracket fixed thereto, said single housing containing and supporting said motor, said electrical circuit and said coupler, said coupler comprising an output driver which removably receives said first end of said shade with rotatable driving relationship,

said elongated reelable shade comprising a conventional roller shade having a support pin fixed to its said second end, which support pin is rotatable receivable by said second bracket;

said reelable shade having a coupling socket fixed to said first end thereof which is removably connectable to said coupler;

and further wherein said elongated reelable shade comprises a hollow tube which receives an elongated coil spring which is coaxial with said tube;

one end of said spring being fixed to a rectangular cross-section barb which is adapted to be fixed to a slot in a conventional shade bracket whereby said spring may be wound in response to the unreeling of said shade in said conventional bracket;

said support pin being fixed to said barb and being rotatable within said second bracket, thereby to deactivate the action and effect of said spring during the reeling and unreeling of said shade.

44. In combination:

an elongated reelable shade comprising first and second opposite ends, first and second spaced support brackets, said second support bracket being removably connected to said second end of said elongated reelable shade for supporting said reelable shade from a fixed support, an electrical drive motor having an output shaft for rotating said elongated reelable shade around its axis to selectively reel and unreel said shade, an electrical circuit for energizing and operating said motor, the electrical circuit including a controller coupled to and controlling the operation of said motor, and a coupler for removably coupling said output shaft of said motor to said first end of said elongated reelable shade, a single housing having said first bracket fixed thereto, said single housing containing and supporting said motor, said electrical circuit and said coupler, said coupler comprising an output driver which removably receives said first end of said shade with rotatable driving relationship;

and further wherein said coupler comprises a hexagonal ball formed on an end of a shaft driven by said drive motor to be coupled to said first end of said elongated reelable shade and a hexagonal socket fixed to said first end of said elongated reelable shade for releasably receiving said hexagonal ball despite angular misalignment between the axis of rotation of said hexagonal ball and the axis of rotation of said reelable shade.

45. In combination:

an elongated reelable shade comprising first and second opposite ends, first and second spaced support brackets, said second support bracket being removably connected to said second end of said elongated reelable shade for supporting said reelable shade from a fixed support, an electrical drive motor having an output shaft for rotating said elongated reelable shade around its axis to selectively reel and unreel said shade, an electrical circuit for energizing and operating said motor, the electrical circuit including a controller coupled to and controlling the operation of said motor, and a coupler for removably coupling said output shaft of said motor to said first end of said elongated reelable shade, a single housing having said first bracket fixed thereto, said single housing containing and supporting said motor, said electrical circuit and said coupler, said coupler comprising an output driver which removably receives said first end of said shade with rotatable driving relationship;

said controller including "raise" and "lower" switches for manually actuating the drive motor; and

further wherein the controller includes a program switch and a microprocessor, the program switch being coupled to the microprocessor, the program switch enabling a shade upper and lower level limit to be programmed.

46. The combination of claim 45, wherein the program switch is utilizable in combination with the "raise" and "lower" switches to set the upper and lower level limits, the "raise" switch setting the upper limit after the program switch is actuated and the "lower" switch setting the lower level limit after the program switch is actuated.

47. In combination:

an elongated reelable shade comprising first and second opposite ends, first and second spaced support brackets, said second support bracket being removably connected to said second end of said elongated reelable shade for supporting said reelable shade from a fixed support, an electrical drive motor having an output shaft for rotating said elongated reelable shade around its axis to selectively reel and unreel said shade, an electrical circuit for energizing and operating said motor, the electrical circuit including a controller coupled to and controlling the operation of said motor, and a coupler for removably coupling said output shaft of said motor to said first end of said elongated reelable shade, a single housing having said first bracket fixed thereto, said single housing containing and supporting said motor, said electrical circuit and said coupler, said coupler comprising an output driver which removably receives said first end of said shade with rotatable driving relationship;

a shade limit switch with a shade limit switch actuator positioned adjacent the path of said shade as said shade reels and unreels;

said switch being coupled to said controller and being operated in response to the movement of said shade to first and second limit positions whereby, when either of said first or second limit switch positions is reached, said switch is operated and said motor is stopped,

said shade limit switch actuator including a pivotally mounted shade limit lever arm;

said shade limit lever arm having an end disposed adjacent the path of movement of said shade;

the free end of said shade having an enlarged hem liner along its edge, said hem liner at the free end of said shade engaging and rotating said shade limit lever arm when said free end of said shade reaches said shade limit lever arm while said shade is being reeled;

said limit switch actuator including a pivotally mounted shade full extension limit lever arm;

said shade full extension limit lever arm having an end disposed adjacent to but spaced from the outer periphery of said reelable shade and being removed from the path of said shade when said shade is being unreeled from one side of the shade reel, but being disposed in the path of said shade after said shade has been fully unreeled and when continuous unreeling causes said shade to reel in an opposite direction over the shade reel, thereby to activate said shade limit switch to stop said motor,

the controller including "raise" and "lower" switches for manually activating the drive motor,

further wherein the controller includes a program switch and a microprocessor, the program switch being coupled to the microprocessor the program switch enabling a shade upper and lower limit to be programmed.

48. The combination of claim 47, wherein the upper level limit is below a shade limit determined by said shade limit lever arm and said lower level limit is above the full extension of the reelable shade determined by said shade full extension limit lever arm.

49. The combination of claim 48, wherein after the drive motor is stopped when said shade limit lever arm is actuated, said drive motor is reversed to return the shade to the shade upper level limit.

50. The combination of claim 49, wherein when the full extension of said shade is reached, said drive motor is reversed to return said shade to a preset level.

51. The combination of claim 50, wherein said preset level comprises the lower level limit.

52. The combination of claim 50, wherein said preset level comprises the upper level limit.

53. The combination of claim 52, wherein said upper level limit is reached by the controller executing the following steps:

stopping the motor when the full extension limit lever arm changes the state of said switch;

reversing the motor direction until said shade is fully reeled on the shade reel and said switch again changes state;

stopping the motor, reversing the motor direction again;

setting a counter of said microprocessor to a preset number when the switch again changes state; and

stopping the motor when the shade reaches the upper limit.

54. The combination of claim 53, wherein the preset number in the counter is zero.

55. The combination of claim 48, further comprising a home level position of said shade corresponding to a change of state of said switch by said limit lever arm after said limit lever arm has first changed the state of said switch while said shade is being reeled upwardly, the motor is then reversed and said switch changes state again.

56. The combination of claim 55, wherein the home level position corresponds to a level of said shade above the upper level limit.

57. The combination of claim 56, wherein said home level position corresponds to a preset number in a position register of a microprocessor, said upper level limit and lower level limits corresponding to preset integral numbers of revolutions of said reelable shade from said preset number corresponding to the home level position.

58. The combination of claim 57 wherein the preset number corresponding to the home level position is zero.

59. The combination of claim 57, wherein said microprocessor determines the rotational speed of said motor by determining the number of revolutions of said motor shaft in a time period.

60. The combination of claim 59 wherein said microprocessor controls said electrical circuit so as to maintain the rotational speed of said drive motor substantially constant.

61. An elongated reelable window shade adapted for motor operation by an external motor drive;

said shade comprising an elongated rigid tubular barrel having an elongated shade reeled thereon;

one end of said barrel having a drive coupler connected thereto for removable connection to a motor drive;

the opposite end of said barrel containing an interior elongated torsion spring having an exterior rectangular barb connector for connection to the slot of a conventional shade mounting bracket; and

a circular pin with a low friction outer surface and having a slot in one end surface thereof which is force-fitted onto the end of said barb;

said circular pin being coaxial with said barrel and said spring.

62. The shade of claim 61, wherein said drive coupler is a socket pressed into said one end of said barrel and having a hexagonal opening therein for receiving a hexagonal ball driver.

63. A process of installing a motor-operated window shade comprising the steps of fixing a pin in a first end of said shade, fixing a connector socket in a second end of said shade, fixing a first bracket to a shade support surface for rotatably receiving said first end of said shade, fixing a second bracket carrying a motor driven shaft stub in a location spaced from said first bracket, inserting said motor driven shaft stub into said connector socket and inserting said pin for rotation in said first bracket, said step of inserting said motor driven shaft stub into the connector socket comprising coupling said motor driven shaft stub having a hexagonal ball end and said socket having an interior hexagonal opening for receiving the hexagonal ball to accommodate angular misalignment of the motor shaft stub and the connector socket.

64. The process of claim 63, wherein said motor driven shaft stub is at least approximately coaxial with the axis of said window shade.

65. A process of retrofitting with a motor operated mechanism, a reelable window shade of the type having a pin end and a spring mounted barb end, the process comprising the steps of fixing a second pin to the barb end of said shade, replacing said pin of said shade with a connector socket, fixing a first bracket to a shade support surface for rotatably receiving said second pin attached to said barb end of said shade, fixing a second bracket carrying a motor driven shaft stub in a location spaced from said first bracket, inserting said motor driven shaft stub into said connector socket and inserting said second pin for rotation in said first bracket.

66. The process of claim 65, wherein said motor driven shaft stub is at least approximately coaxial with the axis of said window shade.

67. The process of claim 66, wherein said motor driven shaft stub has a hexagonal ball end and wherein said socket has an interior hexagonal opening for receiving said hexagonal ball.

68. In combination, a plurality of spaced reelable shades, a plurality of reversible drive motors separate from and connected to one end of respective ones of each of said shades, a control circuit for operating each of said drive motors from a common power source;

and a communication circuit for interconnecting each of said control circuits to operate each of said plurality of reversible motors so that their respective shades are reeled and unreeled in a predetermined synchronism with one another;

a respective unitary housing for each of said reversible drive motors and their respective control circuits;

each of said housings containing at least first and second four-wire jacks coupled to their respective communication circuit;

each said four-wire jacks having first, second, third and fourth lateral connectors disposed side by side and extending therefrom wherein the application of a signal connecting the first and second or third and fourth connectors causes the drive of said motor in a first direction and the application of a signal connecting said first and third or said second and fourth connectors causes the drive of said motor in an opposite direction;

a four-wire cable connected from a four-wire jack of a first of said jacks in a first of said housings to a four-wire jack of a first of said jacks in a second of said housings;

the connection of said four wire cable being polarity insensitive.

69. The combination of claim 68, wherein a separate microprocessor is provided to control the operation of each of said control circuits and whereby said plurality of control circuits can be connected in daisy chain relationship without an interface circuit.

70. In combination:

an elongated reelable shade comprising first and second opposite ends, first and second spaced support brackets, said second support bracket being removably connected to said second end of said elongated reelable shade for supporting said reelable shade from a fixed support, an electrical drive motor having an output shaft for rotating said elongated reelable shade around its axis to selectively reel and unreel said shade, an electrical circuit for energizing and operating said motor, the electrical circuit including a position sensing means for sensing the position of said reelable shade, a controller coupled to and controlling the operation of said motor, and a coupler for removably coupling said output shaft of said motor to said first end of said elongated reelable shade, a single housing having said first bracket fixed thereto, said single housing containing and supporting said motor, said electrical circuit and said coupler, said coupler comprising an output driver which removably receives said first end of said shade with rotatable driving relationship, and further including a shade limit switch positioned adjacent the path of said shade as said shade reels and unreels;

said switch being coupled to said controller and being operated in response to the movement of said shade to a first extreme position, whereby when said first extreme position is reached, said switch is operated, said motor is stopped, and said position sensing means is reset.

71. The combination of claim 70, wherein said first extreme position is a home position and further wherein said shade can unreel to a second extreme position, said second extreme position being a fully extended position where said shade is completely unreeled.

72. The combination of claim 70, wherein said first extreme position is a reference point from which an upper limit position of said reelable shade is referenced.

73. The combination of claim 70, wherein said first extreme position is a reference point from which a multitude of preset positions of said reelable shade are referenced.