AU2006202813B2 - Method and device to motorize bladeset rotation angle of shutter - Google Patents

Description

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT Applicant: Nien Made Enterprise Co., Ltd Invention Title: METHOD AND DEVICE TO MOTORIZE BLADESET ROTATION ANGLE OF SHUTTER The following statement is a full description of this invention, including the best method of performing it known to me/us: METHOD AND DEVICE TO MOTORIZE BLADESET ROTATION ANGLE OF SHUTTER Cc BACKGROUND OF THE INVENTION Cc Field of Invention 00 S 5 The present invention relates to a method and device to motorize bladeset rotation (Ni angle of a shutter, and more particularly, to a method and device to motorize bladeset Srotation angle of a shutter which, at least in preferred embodiments, can rotate the bladeset of the shutter to a required angle rapidly when using, and provide a better convenience of operation.

Related Art With an increasing progress on science and technology, the hope of people to continuously pursuit an enhanced life quality has been achieved, and many necessities of daily life also come into being automatized. As shown in FIGs. la and Ib, a conventional shutter generally includes a frame 20 pivotally disposed on the edge of the window (not shown) and a plurality of blades 21a pivotally disposed on two sides of the frame 20 in horizontal parallel. Two ends of each of the blades 21a are inserted into the pivot holes (not shown) on the inner side of the frame 20 through a pivot piece 210 which can be rotated and has an appropriate damping (used for preventing the bladeset from rotating automatically due to its own weight). The intermediate section of each of the blades 21a facing the room is linked up with each other through a pull rod 22 via looped links, such that the angle of the whole bladeset 21 of the shutter is adjusted by pushing and pulling the pull rod 22 manually.

However, the manual operation of adjusting the angle of the blade needs to be performed near the shutter. When a large number of shutters are required to be adjusted, they must be operated one by one, and also it is quite difficult to rotate each of the shutters 00 3 O to the required given angle correctly and nicely, thereby Sresulting in an inconvenience in operation and use.

O Substantially, the operation may be motorized by using a motor device. Such a motorized mechanism must be capable of being operated forward and backward, and generally a small DC motor can be used and a cell is used as a power. For the angle control, it is substantially C00 possible that multiple shutters are operated Ssimultaneously by using a remote control signal, however, D1io if starting forward and backward rotations and stopping are controlled only depending on visualization by an operator, one similar case that multiple shutters are incapable of being simultaneously adjusted to a common given angle during an manual operation still occurs.

Further, for the motorized device, a user can still operate manually, thus a motorization design must meet such a requirement and should not result in a conflict or damage to the device. Therefore, if would be desirable to achieve the convenience in use and operation and to achieve a motorization of the bladeset angle of the shutter by using simple and reliable device and method.

It would be desirable to provide a method and device to motorize blade set rotation angle of a shutter for, at least in preferred embodiments, overcoming the defect that the blade is incapable of being rapidly rotated to the required angle when the conventional shutter is used, and meanwhile meeting the requirement that the motorized device of the shutter also allows the user to adjust the blade set manually.

SUMMARY OF THE INVENTION According to a first aspect of the present invention there is provided a method to motorize the bladeset rotation angle of a shutter while allowing manual rotation of the bladeset, performing the following steps: providing a sensor to detect at least an origin point of the bladeset rotation; providing a moment restrictor in a transmission means N:\Brsbane\Cases\Patont61000-61999\P61368 AU\Specis\P61368 AU Specification 2008-9-23doc 7110108 4 00 O between a motor and an output shaft linked with the Sbladeset for allowing the motor to drive the output shaft 0 and to prevent an overload from the bladeset and the output shaft to the motor; and providing a controller to receive user commands of a target angle and to control said motor to rotate selectively in a first and second direction based on 00 detection of an origin point so as to rotate said bladeset Sto said target angle.

ND 10 According to a further aspect, the present invention Sprovides a method to motorize bladeset rotation angle of a shutter, which allows the user to operate by taking a given target angle as an instruction. The method comprises resetting the bladeset of the shutter to an origin point position at first when an instruction of starting the target angle is received; and then rotating the bladeset of the shutter to a given target angle with respect to the origin point, and calculating a residual angle deviation to continuously rotate the bladeset to the given target when an instruction of the given rotation angle is received again during the operation.

A preferred embodiment of the present invention provides five kinds of instruction selections such as an upper original point, 45 degrees, 90 degrees, 135 degrees and a lower origin point, such that the bladeset of the shutter automatically rotates to the required rotation angle only according to one instruction from the user.

According to a further aspect of the invention there is provided a device to motorize bladeset rotation angle of a shutter, wherein each blade of the bladeset of the shutter is connected to a pull rod for a linked-up control, and each blade of the bladeset of the shutter is socketed with an output shaft through an end cover for a transmission and is pivotally connected to the corresponding shaft hole of a frame, the device comprising: a sensor for sensing at least one origin point N \Brisbane\Cases\Patent\61000-61999\P61368 AU\Specis\P61368 AU Specrfication 2008-9-23 doc 7/10108 5 position of the bladeset, and comprising an actuating Spiece and a switch, the actuating piece being connected to O the output shaft; a driver comprising a motor, a reduction gear set and a moment restrictor, the gear set and the moment restrictor being connected to the output shaft, to drive the output shaft to rotate the bladeset of the shutter and

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0 to prevent an overload from the bladeset and the output O shaft to the motor; and ID 10 a controller for receiving a signal of instruction of Sa target angle and for controlling the driver and determining the origin point position of the bladeset through the sensor, and driving the bladeset to rotate to the target angle.

According to a further aspect of the present invention there is provided a device to motorize bladeset rotation angle of a shutter, which comprises an input interface for inputting instructions; a sensor for sensing at least one origin point position of the bladeset, a driver for driving the bladeset to rotate, and a controller for calculating and controlling the operation of the driver according to the origin point position and the target angle, such that the bladeset is rotated to the required angle rapidly and accurately, thereby improving the convenience in use and operation. A moment restrictor is also provided in an embodiment of the present invention, such that only appropriate connecting moment is delivered between the driver and the bladeset, thus when the moment exceeds a preset range, the moment restrictor is departed from each other, thereby protecting the drive construction from being damaged and allowing the user to adjust the bladeset manually.

The method and device to motorize the bladeset rotation angle of the shutter according to the present invention, at least in preferred embodiment, enables the bladeset of the shutter to be rotated to the given angle under instruction, and allows a remote control operation, N:\Brisbane\Cases\Palent\61000-61999\P61368 AU\Specis\P61368AU Specification 2008-9-23.doc 7/10/08 00 5a 00 0 and meanwhile controls the bladeset of multiple shutters Sto be rotated to the target angle. Furthermore, the 0 present invention, at least in preferred embodiments, Senables the bladeset of the shutter to seek the origin point wisely, controls the rotation to the target angle 00

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N \Brisbane\Cases\Patent\61000-61999\P61368 AU\Specis\P61368 AU Specfication 2008-9-23 doc 7/10/08 accordingly, and allows updating of the requirement for the target angle during the process, thereby saving the time and power consumption and considering both the motorized and manual operations.

To have a further understanding of the objects, structures, characteristics, and functions 5 of the present invention, the present invention is illustrated in detail accompanied by related 00oO embodiments and drawings as follows.

I Further scope of applicability of the present invention will become apparent from the

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detailed description given hereinafter. However, it should be understood that the detailed C description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will become more fully understood from the detailed description given herein below for illustration only, and which thus is not limitative of the present invention, and wherein: FIG. la is a schematic view of a bladeset of a shutter according to the prior art; FIG. lb is a schematic view of a bladeset of a shutter in an operating condition according to the prior art; FIG. 2 is a schematic view of assembly of the device to motorize bladeset rotation angle of the shutter according to an embodiment of the present invention; FIG. 3 is a schematic view of function of the device to motorize bladeset rotation angle of the shutter according to an embodiment of the present invention; FIG. 4 is an exploded schematic view of the body of the device to motorize bladeset rotation angle of the shutter according to an embodiment of the present invention; FIG. 5 is a schematic view of local structures of a driver, a sensor, and a bladeset for rotation angle of the blades of the device to motorize bladeset rotation angle of the shutter according to an embodiment of the present invention; FIG. 6 is a schematic view of input interface for rotation angle of the blade of the 00 i device to motorize bladeset rotation angle of the shutter according to an embodiment of the NI present invention;

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SFIG. 7 is a schematic view of rotation angle of the blade of the method to motorize (-i bladeset rotation angle of the shutter of an embodiment of the present invention; FIG. 8 is a schematic view of the flow of the method to motorize bladeset rotation angle of the shutter according to an embodiment of the present invention; FIG. 9a is a perspective view of the gear set and elastic damping means of the device to motorize bladeset rotation angle of the shutter according to an embodiment of the present invention; and FIG. 9b is an exploded view of the gear set and elastic damping means of the device to motorize bladeset rotation angle of the shutter according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION Please refer to FIGs. 2 and 3 of schematic views of assembly and function of an embodiment of the present invention. As shown in FIGs. 2 and 3, the device 1 to motorize bladeset rotation angle of shutter of an embodiment of the present invention comprises a body 10 buried on one side of a frame 20 of the shutter, an output shaft 109 fitted with one end of one of the blades of the bladeset 21 through an end cover 212 for transmission. The body 10 can be controlled remotely with an input interface 61 by transmitting signals in a wired or wireless manner, and the wireless communication manner may be a radio Q)frequency or an infrared signal manner. Here, each of the blades of bladeset is pivotally Sconnected to a corresponding spindle hole of the frame 20 in a smoothly-rotatable manner, such that the output of the device I is controlled to be sufficient to drive the bladeset 21 to Cc rotate. The shutter includes a pull rod 22 joining each of the blades of bladeset 21 together for a linked-up control, and allows a manual operation by the user. During a motorizing operation, a plurality of keys of the given target angle on the input interface 61, for example 00 an upper origin point key 610, a first target angle (45 degrees) key 611, a second target

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angle (90 degrees) key 612, a third target angle (135 degrees) key 613, etc., is used for Noutputting an angle instruction to the body 10, such that the bladeset 21 of the shutter N 10 automatically rotates to the required upper origin point U, the first target angle A, the second target angle B, the third target angle C, etc..

Please refer to FIG. 4 of an appearance and local exploded view of the body 10 of one embodiment of the present invention. The body 10 generally is a box buried and fixed in the frame of shutter (not shown), and an output shaft 109 is connected to an end cover 212 fitted with one end of one of the blades of bladeset 21 for transferring a rotary force. The power coming from a battery (not shown) in the body 10 is controlled to drive a motor 51 driven. A battery cover 101 may be taken off for replacing the battery. Generally, the body of the device to motorize bladeset rotation angle of a shutter comprises a receiver (not shown), for example an infrared signal receiving circuit, for receiving a control instruction; a sensor 40 for sensing at least one origin point position of the bladeset 21, a driver 50 for driving the bladeset 21 to rotate, and a controller (which contains a microprocessor and a circuit) for calculating and controlling the operation of the driver 50 according to the origin point position. Here, the sensor 40 includes an actuating piece 41 connected to the output shaft 109 and a switch 42, and the driver 50 includes a motor 51 and a reduction gear set (such as the gears 52, 53, 54, 55 described below), for driving the output shaft 109. When the controller receives the instruction signal from the input interface, the driver 50 is controlled to determine the origin point position of the bladeset 21 by utilizing the sensor and then the bladeset 21 is further driven to the target angle.

SFIG. 5 shows a local structure of one embodiment of the driver 50, the sensor 40, and the bladeset 21 (represented by the end cover 212). The output shaft of the motor 51 is connected to a motor gear 52, a big gear 53 is engaged with the motor gear 52, a small gear (cf 54 and the big gear 53 are set coaxially, which are connected with each other or have a moment restrictor, an output gear 55 is fixed to the output shaft 109, and the above motor 51, motor gear 52, and coaxial gear set (including the big gear 53 and the small gear 54) and 00oO output shaft 109 together form the driver 50 disposed in the body 10, such that the coaxial gear set (including the big gear 53 and the small gear 54) and the output shaft 109 may be positioned and rotated pivotally, and thereby the rotary force of the motor 51 is decreased in I 10 speed and increased in force and then transmitted to the output shaft 109. The output shaft 109 forms a cross shaped (or another suitable shape) spindle hole 109a to transfer the rotary force in combination with a protrusion 212a corresponding to the end cover 212 of the blade. The motor 51 preferably is a stepping motor, by the driving pulse of which the rotation angle is controlled exactly. At least one actuating point is set on the output shaft 109, and here two actuating protrusions 411, 412 respectively correspond to the upper origin point U and lower origin point D of the bladeset 21. The actuating protrusions 411, 412 press a switch 42 for an actuation through a spring 413, such that the switch 42 produces an ON signal when the output shaft 109 and the bladeset 21 are rotated to near the positions of upper, lower limits of a rotatable range of the blade (that is the upper origin point and the lower origin point), while produces an OFF signal when they are at other intermediate angles. The controller (not shown) controls the bladeset 21 to be rotated and positioned according to the signals, and once the controller determines that the bladeset 21 has reached the upper or lower origin point U or D, the blades are accordingly controlled to be rotated to other positioning angles A, B, C etc. The above spring 413 and switch 42 (fixed on a circuit board 62) are both fixed within the body 10, and form the sensor together with the actuating protrusions 411, 412.

FIG. 6 shows an embodiment of the input interface 61 of the present invention. The input interface preferably is a remote control, such that multiple shutters may be remotely controlled simultaneously with a radio frequency or an infrared signal. The input interface S61 is provided with a plurality of given target angle keys, for example the upper origin point Skey 610, the first target angle key 611, the second target angle key 612, the third target angle key 613, the lower origin key 614 and a stop key 615. Accordingly, the user only Cc needs to choose to press any one of the target angle keys 610, 611, 612, 613, and 614 to send out the instruction signal, the device automatically performs the angle control. During the performance, the user may change the target angle at any time or may press the stop key 00 C"1 615 to stop the rotation of the bladeset 21.

INC The control method of the present invention is illustrated by taking FIG. 7 as an Sexample; FIG. 7 is a schematic view of the rotation angle of the bladeset 21. For example, when starting from an initial point SI, the blade first rotates upwards until reaching the upper origin point U (the sensor is ON), and then the controller counts the angle (with time or in pulse number) inversely to rotate the blade to the target angle TI. During this period, for example being at the intermediate point M1 before reaching the upper origin point U, even though the setting of the target angle is changed, the controller continues to perform an upward rotation to turn to the control of a new target angle after finding the upper origin point U (if the target angle is the upper origin point U or the lower origin point D, the rotation proceeds upwards, downwards to the end at any time). If the instruction of a new target angle is received when the upper origin point U is exceeded and an intermediate point M2 is reached, the controller reckons a subsequent travel with the current position and continues to rotate the blade to the new target angle T2. For example, if again receiving the instruction of a new target angle at an intermediate point M3 before T2 is reached, the controller inversely rotates the blade to the new target angle T3 since the position has been exceeded. Another example on control is that, the blade 21 originally stops at the lower origin point D, the sensor being ON, and when being restarted, the controller is incapable of determining whether the blade 21 is at the upper origin point U or at the lower origin point D (since the blade may be moved manually by the user when it is stopped), so the controller still controls the blade to rotate upwards. The sensor 40 is checked at real time, and if it is found that the signal has changed from ON to OFF, it is known that the blade 21 is at the lower origin point D originally, and the blade can be controlled to rotate towards the target angle (that is the second target angle B) accordingly.

The method to motorize the bladeset rotation angle of the shutter of the present invention is still illustrated by referring to FIG. 8 which is a flow diagram. When receiving a start instruction which causes the blade to start from a stop state, the state of sensor in a current position is checked and recorded (step S 10). The blade rotates upwards by a certain 00 rotation angle (step S20). The case on a change in the sensor is determined (step S30). If the

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sensor 40 changes from ON to OFF, it represents that the blade originally is at the lower INC origin point, so a present angle equals to the lower origin point minus the rotation angle (step S40), the rotation continues to be controlled accordingly. If the sensor remains OFF or has changed from OFF to ON just now, it represents that the upper origin point U has still not been reached (or been entered just now), the controller may continues to rotate the blade by a certain rotation angle for a re-determination, and when it is determined that the sensor remains ON, it represents that the blade now is at the upper origin point, and a present angle equals to the upper origin point (step S50), and the blade may be rotated downwards to the target angle accordingly. During the operation, a difference between an up-to-date target angle and a present angel is viewed circularly (step S60). If the present angle is larger than the target angle, the blade is rotated upwards, that is the blade is rotated upwards by a rotation angle and the rotation angle is subtracted from the present angle (step S70). If the present angle is less than the target angle, the blade continues to be rotated downwards, that is the blade is rotated downwards by a rotation angle and the rotation angle is subtracted from the present angle (step S80). If the difference equals to 0, the rotation is stopped. In this embodiment, the rotation angle modified each time is represented by 5 degrees, and practically other angle values may also be used for operation.

In the present invention, at least in preferred embodiments, the motor functions as a power which is slowed down by the reduction gear set, such that the output shaft generates a sufficient moment, correspondingly, when the pull rod or blade is rotated by manual operation, or a barrier is encountered or a dead point is reached during the blade rotation, an external force is input from the blade, which relatively drives an internal driver means to (rotate instantly and rapidly, such that the driver means is easy to be damaged. Therefore, at Fleast in preferred embodiments, a moment restrictor is designed on the transmitting path

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between the transmitting shaft and the motor output shaft, such that the transmitting force Cc detaches when the external force or load exceeds a preset value, and thereby avoiding the driver means from being damaged by the external force. In the embodiment as shown in FIG. 5 of the present invention, an elastic damping structure is designed on the coaxial 00 reduction gear, and as shown the perspective and exploded view of FIGs. 9a and 9b, the big, N, small gears 53, 54 are slidably arranged on the shaft rod 56, and an elastic piece, for Sexample colloidal silica or a rubber ring 59, is clamped therebetween, which is firmly S 10 locked to an appropriate pressure by utilizing the shoulder region of one end of the shaft rod 56 or a snap ring 561 as well as a screw thread 562, a washer 580 and dual lug nuts 581, 582 at the other end, and thereby generating an appropriate friction rotation moment. Thus a moment is set sufficient to be output from the inside to drive the blade to rotate, and is capable of protecting the internal driver means from being damaged by the undue moment input from the outside via an overload slip. The moment restrictor naturally may be designed between the output gear and the output shaft, or on the motor gear.

The method and device to motorize bladeset rotation angle of the shutter of the present invention, at least in preferred embodiments, can achieve the following functions.

1. The present invention, at least in preferred embodiments, enables the bladeset of the shutter to be rotated to the given angle under an instruction, and allows a remote control operation, and meanwhile controls the bladeset of multiple shutters to be rotated to the target angle; 2. The present invention, at least in preferred embodiments, enables the bladeset of the shutter to seek the origin point wisely, controls the rotation to the target angle accordingly, and allows updating of the requirement for the target angle during the process, thereby saving the time and power consumption and considering both the motorized and manual operations.

q The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are Cc intended to be included within the scope of the following claims.

In the claims which follow and in the preceding description of the invention, except 00 where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as "comprises" or "comprising" is used in an inclusive IDsense, ie. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.

Claims (19)

1. A method to motorize the bladeset rotation angle O of a shutter while allowing manual rotation of the bladeset, performing the following steps: providing a sensor to detect at least an origin point of the bladeset rotation; providing a moment restrictor in a transmission means 00 between a motor and an output shaft linked with the Sbladeset for allowing the motor to drive the output shaft IO 10 and to prevent an overload from the bladeset and the Soutput shaft to the motor; and providing a controller to receive user commands of a target angle and to control said motor to rotate selectively in a first and second direction based on detection of an origin point so as to rotate said bladeset to said target angle.

2. The method to motorize bladeset rotation angle of a shutter as claimed in claim 1, wherein the step of controlling the bladeset comprises the steps of: rotating the motor and the bladeset in the first direction till said origin point is detected; and rotating the motor and the bladeset in the second direction with a suitable angle correlative to said target angle.

3. A device to motorize bladeset rotation angle of a shutter, wherein each blade of the bladeset of the shutter is connected to a pull rod for a linked-up control, and each blade of the bladeset of the shutter is socketed with an output shaft through an end cover for a transmission and is pivotally connected to the corresponding shaft hole of a frame, the device comprising: a sensor for sensing at least one origin point position of the bladeset, and comprising an actuating piece and a switch, the actuating piece being connected to the output shaft; a driver comprising a motor, a reduction gear set and a moment restrictor, the gear set and the moment N:\Brisbane\Cases\Patent\61000-61999\P61368 AU\Specis\P61368 AU Specification 2008-9-23 doc 7/10/08 00 15 0 O restrictor being connected to the output shaft, to drive Sthe output shaft to rotate the bladeset of the shutter and O to prevent an overload from the bladeset and the output shaft to the motor; and a controller for receiving a signal of instruction of a target angle and for controlling the driver and determining the origin point position of the bladeset C0 through the sensor, and driving the bladeset to rotate to 0 the target angle. Silo

4. The device to motorize bladeset rotation angle of 0 a shutter as claimed in claim 3, further comprising: a body for accommodating the sensor, the driver and the controller; and an input interface for transmitting the instruction signal to the controller.

The device to motorize bladeset rotation angle of a shutter as claimed in either claim 3 or 4, further comprising a battery disposed in the body for providing the required power.

6. The device to motorize blade rotation of a shutter as claimed in any one of claims 3 to 5, wherein the motor is a stepping motor.

7. The device to motorize bladeset rotation angle of a shutter as claimed in any one of claims 3-6, wherein the reduction gear set comprises a motor gear, a coaxial gear set and an output gear, the motor gear is fixedly connected to the output shaft of the motor, and the coaxial gear set comprises a small gear and a big gear engaged with the motor gear, and the output gear is fixedly set on the output shaft.

8. The device to motorize bladeset rotation angle of a shutter as claimed in claim 7, wherein the big gear and small gear are slidably arranged on a shaft rod, and an elastic piece is clamped therebetween for remaining an appropriate transmitting moment.

9. The device to motorize bladeset rotation angle of a shutter as claimed in any one of claims 3-8, wherein the N:\Brisbane\Cases\Patent\61000-61999\P61368 AU\Specis\P61368 AU Specification 2008-9-23 doc 7/10/08 16 00 O output shaft is provided with at least one actuating Spoint, and has an actuating protrusion corresponding to at O least one origin point angle of the bladeset for pushing and pressing the switch of the sensor to actuate.

10. The device to motorize bladeset rotation angle of a shutter as claimed in any one of claims 3-9, wherein the output shaft forms a shaft hole for transferring a rotary 00 force in combination with the protrusion correspondingly Sformed by the end cover of the blade. 0D 1o

11. The device to motorize bladeset rotation angle of Sa shutter as claimed in claim 10, wherein the shaft hole of the output shaft is of a cross shape.

12. The device to motorize bladeset rotation angle of a shutter as claimed in claim 4, wherein the input interface outputs an angle instruction to the body in a wired or wireless communication manner.

13. The device to motorize bladeset rotation angle of a shutter as claimed in claim 12, wherein the input interface is a remote control which communicates in a radio frequency or an infrared manner.

14. The device to motorize bladeset rotation angle of a shutter as claimed in claim 4, wherein the input interface is provided with a plurality of given target angle keys.

15. The device to motorize bladeset rotation angle of a shutter as claimed in claim 14, wherein the plurality of given target angle keys comprises at least a part of an upper origin point key, a first target angle key, a second target angle key, a third target angle key, a lower origin point key, and a stop key.

16. The device to motorize bladeset rotation angle of a shutter as claimed in claim 15, wherein the first target angle is 45 degrees.

17. The device to motorize bladeset rotation angle as claimed in either claim 15 or 16, wherein the second target angle is 90 degrees.

18. The device to motorize bladeset rotation angle of N:\Brisbane\Cases\Patent\61000-61999\P61368 AU\Specis\P61368 AU Specification 2008-9.23 doc 7/10/08 00 17 0 O a shutter as claimed in any one of claims 15-17, wherein Sthe third target angle is 135 degrees. O

19. A method of motorizing bladeset rotation of a shutter substantially as hereinbefore described with reference to and as illustrated by Figs. 2 to 9B. A device to motorize bladeset rotation angle of a shutter, substantially as hereinbefore described with oo reference to Figs. 2 to 9B, and/or as shown in Figs. 4 and 0 (N ID 10 21. The device to motorize bladeset rotation angle of 0 a shutter as claimed in any one of claims 3-18, wherein the moment restrictor is an elastic clamping. N kBrsbane\Cases\Patent\61 GO-61999\P61 368.AUkSpecis\P61 368.AU Specification 2008-9-23doc 7/10108