Window shade and actuation system thereof

Abstract

The invention provides an actuating system of a curtain, comprising: a transmission shaft having a longitudinal axis and pivotable about the longitudinal axis; and the speed stabilizer comprises a shell with an inner wall and a rotary disc arranged in the shell and configured to be pivotally coupled with the transmission shaft, the rotary disc carries a plurality of friction pieces, the friction pieces are angularly spaced from one another around the longitudinal axis of the transmission shaft, and the rotary disc can synchronously pivot with the transmission shaft in the state that the friction pieces rub the inner wall of the shell.

Description

Technical Field

[0001] The present invention relates to a window blind and an actuation system thereof. Background Art

[0002] Some curtains on the market use an operating cord to pull up the bottom of the curtain and a rod to lower the bottom. More specifically, the operating cord can be pulled to drive a rotating member to pivot, and the rotational movement of the rotating member is transmitted to a transmission shaft, which pivots the transmission shaft to reel in the hanging cord connected to the bottom. When the user rotates the rod, the brake member coupled to the rod releases the transmission shaft, causing the transmission shaft to pivot, and the bottom can move downward due to gravity. The free fall of the bottom may accidentally hit the user and cause damage to the components of the curtain. Summary of the invention

[0003] An object of the present invention is to provide an actuating system for a curtain, which can at least solve some of the above problems.

[0004] According to one embodiment, the actuation system includes: a transmission shaft having a longitudinal axis and being pivotable about the longitudinal axis; and a speed stabilizer including: a housing having an inner wall; and a turntable disposed in the housing and configured to be pivotally coupled to the transmission shaft, the turntable carrying a plurality of friction members, the plurality of friction members being angularly spaced from each other about the longitudinal axis of the transmission shaft, and the turntable being pivotable synchronously with the transmission shaft in a state where the plurality of friction members rub against the inner wall of the housing.

[0005] According to an embodiment, the plurality of friction members are in lubricating contact with the inner wall of the housing.

[0006] According to one embodiment, the turntable is coupled to a plurality of support arms, and the plurality of friction members are fixedly connected to the plurality of support arms, and when the transmission shaft and the turntable pivot synchronously around the longitudinal axis, the plurality of support arms are biased to cause the plurality of friction members to move toward the inner wall of the shell.

[0007] According to an embodiment, when the transmission shaft and the rotating disk synchronously pivot about the longitudinal axis, the plurality of support arms are biased by centrifugal force, so that the plurality of friction members press the inner wall of the housing.

[0008] According to an embodiment, each of the plurality of support arms is pivotally connected to the turntable.

[0009] According to an embodiment, the turntable has a pivot pin, and a plurality of the plurality of support arms are pivoted about the pivot pin.

[0010] According to an embodiment, the plurality of support arms include two support arms, and the two support arms are pivotally connected to the turntable at two locations away from the longitudinal axis, respectively.

[0011] According to one embodiment, the two support arms are pivotally connected to the turntable at two diametrically opposite locations.

[0012] According to one embodiment, each of the two support arms has a coupling end and a terminal end, the coupling end of each of the two support arms is pivotally connected to the turntable, and the coupling end of one of the two support arms is adjacent to the terminal end of the other of the two support arms.

[0013] According to one embodiment, each of the two support arms carries at least one of the plurality of friction members closer to its coupling end than to its distal end.

[0014] According to an embodiment, each of the plurality of friction members is at least partially cylindrical in shape.

[0015] According to an embodiment, the material of the plurality of friction members includes oil-resistant rubber, fluorocarbon rubber and silicone rubber.

[0016] According to one embodiment, the housing includes a shell portion and a cover portion, the shell portion and the cover portion are fixed to each other and at least partially define an inner cavity for accommodating the rotating disk and the plurality of friction members, and the transmission shaft extends through the shell portion and the cover portion.

[0017] According to one embodiment, the actuation system further comprises a control module connected to the transmission shaft, the control module being operable to cause the transmission shaft to pivot to unfold or fold the shielding structure, and the speed stabilizer and the control module are spaced apart from each other along the transmission shaft.

[0018] In addition, the present invention also provides a curtain, comprising: a top rail; a shielding structure suspended by the top rail; and the actuating system, which is installed on the top rail, and the actuating system can be operated to unfold and fold the shielding structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 and Figure 2 The three-dimensional diagrams show the curtains provided by one embodiment of the present invention in different states.

[0020] Figure 3 Draw Figure 1 Exploded view of the curtains.

[0021] Figure 4 An exploded view of a speed stabilizer provided in the actuation system of a window curtain is shown.

[0022] Figure 5 Drawing from another perspective Figure 4 Exploded view of the speed stabilizer.

[0023] Figure 6 and Figure 7 Draw Figure 4 A cross-sectional view of an example operation of a speed stabilizer.

[0024] Figure 8 An exploded view of a modified embodiment of a speed stabilizer is shown.

[0025] Reference numerals list

[0026] 100: Curtains

[0027] 102: Top rail

[0028] 104: Movable rail

[0029] 104A: Channel

[0030] 106: Shielding structure

[0031] 108: Actuation system

[0032] 110: Suspension parts

[0033] 112: Side cover

[0034] 114: Fasteners

[0035] 116: Weighting element

[0036] 118A, 118B: Hard sheet

[0037] 120: Transmission shaft

[0038] 122: Winding unit

[0039] 124: Control Module

[0040] 126: Vertical axis

[0041] 128: Stick

[0042] 128A, 128B: End

[0043] 130: Operating parts

[0044] 132:Handle

[0045] 134: Side cover

[0046] 136: Joints

[0047] 138: Set

[0048] 140:Speed ​​stabilizer

[0049] 142: Shell

[0050] 144: Turntable

[0051] 144A: Outer edge

[0052] 146: Friction parts

[0053] 148: Inner wall

[0054] 150: Inner cavity

[0055] 152A: Shell

[0056] 152B: Cover

[0057] 154A, 154B: shaft

[0058] 156A, 156B: Open

[0059] 158:Through hole

[0060] 160: Support arm

[0061] 160A: coupling end

[0062] 160B: end

[0063] 162:Through hole

[0064] 164: Pivot pin

[0065] 166: Gap

[0066] L: Long axis

[0067] F: Centrifugal force. DETAILED DESCRIPTION

[0068] Figure 1 and Figure 2 The three-dimensional diagrams of the curtain 100 provided by one embodiment of the present invention in different states are shown. Figure 3 An exploded view of the window curtain 100 is shown. Figure 1-3 , the window covering 100 may include a top rail 102 , a movable rail 104 , a shielding structure 106 , and an actuation system 108 . Figure 1 The curtain 100 is shown in a folded or raised state. Figure 2 It shows that the curtain 100 is in an unfolded or lowered state.

[0069] The top rail 102 can be fixed to the top of the window and can be of any shape. According to one embodiment, the top rail 102 can have an elongated shape with a cavity therein that can accommodate at least part of the actuation system 108 .

[0070] The movable rail 104 can be connected by a plurality of suspension members 110 ( Figure 2The movable rail 104 is suspended from the top rail 102 (shown in dotted lines in FIG. 1 ). According to one embodiment, the movable rail 104 is a long rail in which a channel 104A is provided for fixing the shielding structure 106. The opposite ends of the channel 104A can be closed by side covers 112. The suspension members 110 include, for example, but are not limited to, ropes, strips, belts, etc. The suspension members 110 can be connected to the movable rail 104 via fasteners 114, respectively. In one embodiment, the movable rail 104 is the bottom rail of the curtain 100. The movable rail 104 can be provided with a weighting element 116 in the channel 104A to make the movable rail 104 more stable when in use.

[0071] The shielding structure 106 is any suitable structure that can be extended or overlapped between the top rail 102 and the movable rail 104. According to one example, the shielding structure 106 is a cellular structure, which may include, but is not limited to, a honeycomb structure. When the shielding structure 106 is a cellular structure, the upper and lower ends of the cellular structure may be provided with hard sheets 118A and 118B, respectively, so as to facilitate the assembly of the cellular structure with the top rail 102 and the movable rail 104. When in use, the shielding structure 106 and the movable rail 104 may be suspended by the top rail 102, and the shielding structure 106 may be extended or overlapped by the displacement of the movable rail 104 away from or toward the top rail 102.

[0072] See also Figure 1-3 The movable rail 104 can be moved vertically relative to the top rail 102 to adjust the curtain 100 to a desired state. For example, the movable rail 104 can be moved upward toward the top rail 102 to overlap the shielding structure 106 (such as Figure 1 ), or move downward away from the top rail 102 to deploy the shielding structure 106 (as shown Figure 2 The vertical position of the movable rail 104 relative to the top rail 102 may be controlled via operation of the actuation system 108 .

[0073] See also Figure 1-3 The actuation system 108 is mounted on the top rail 102 and is operable to drive the movable rail 104 to move relative to the top rail 102 to unfold and fold the shielding structure 106. The actuation system 108 may include a transmission shaft 120, at least one winding unit 122 pivotally coupled to the transmission shaft 120, and a control module 124 connected to the transmission shaft 120.

[0074] The transmission shaft 120 and the winding unit 122 may be installed in the top rail 102. The transmission shaft 120 is coupled to the winding unit 122 and can pivot about the longitudinal axis 126 of the transmission shaft 120. The winding unit 122 is connected to the movable rail 104 through one or more of the suspension members 110, and can be operated to retract the suspension members 110 to pull up the movable rail 104, or to extend the suspension members 110 to lower the movable rail 104. For example, the winding unit 122 may include a drum (not shown) that is pivotally coupled to the transmission shaft 120 and connected to one end of two suspension members 110, and the other ends of the two suspension members 110 are connected to the movable rail 104, whereby the drum can pivot synchronously with the transmission shaft 120 to retract the suspension members 110 or extend the suspension members 110.

[0075] The control module 124 is connected to one end of the transmission shaft 120 and is operable to cause the transmission shaft 120 to pivot about the longitudinal axis 126 in any direction to unfold or fold the shielding structure 106 .

[0076] According to one embodiment, the control module 124 may include a rod 128, and an operating member 130 and a handle 132 coupled to each other, wherein the rod 128 and the handle 132 may be independently operated to adjust the shielding structure 106. For example, one of the rod 128 and the handle 132 may be operated to drive the movable rail 104 downward to unfold the shielding structure 106, and the other of the rod 128 and the handle 132 may be operated to drive the movable rail 104 upward to fold the shielding structure 106. The control module 124 may be disposed at one end of the top rail 102, and the other end of the top rail 102 may be closed by a side cover 134.

[0077] The rod 128 has an elongated shape and a hollow interior, and both the elongated shape and the hollow interior of the rod 128 can extend along the long axis L of the rod 128 between its two opposite ends 128A and 128B. The material of the rod 128 includes, but is not limited to, plastic. The end 128A of the rod 128 can be pivotally connected to the top rail 102 via a joint 136. The configuration of the joint 136 enables the rod 128 to pivot around the long axis L and tilt to different angles relative to the top rail 102. The rod 128 can pivot around the long axis L to actuate the control module 124.

[0078] The operating member 130 may include any elastic element of a linear shape. For example, the operating member 130 may include, but is not limited to, a rope, a belt, a cable, etc. The operating member 130 extends from the end 128A of the rod 128, and one end of the operating member 130 may be connected to a rotating drum (not shown) in the control module 124, wherein the rotating drum may pivot to retract the operating member 130 and extend the operating member 130. In addition, the operating member 130 may pass through the joint 136 and the end 128A of the rod 128, and extend along the long axis L in the hollow interior of the rod 128.

[0079] The handle 132 is disposed at the end 128B of the rod 128 and is coupled to the operating member 130. The handle 132 may have any suitable shape that is convenient for the user to hold and operate. The handle 132 may actuate the control module 124 by pulling the operating member 130, thereby causing the rotating cylinder (not shown) in the control module 124 to pivot in the extending direction. Specifically, the handle 132 may move between a first position and a second position relative to the rod 128, wherein the handle 132 is adjacent to the end 128B of the rod 128 when in the first position, and moves away from the end 128B of the rod 128 when in the second position. The handle 132 may be pulled away from the end 128B of the rod 128 to actuate the control module 124, thereby adjusting the shielding structure 106.

[0080] See also Figure 1-3 The rod 128 may be fixedly connected to the sleeve 138 at its end 128B, and the cross-section of the sleeve 138 is larger than the cross-section of the rod 128. When the handle 132 is in the first position, it may be adjacent to the sleeve 138 and at least partially accommodated in the sleeve 138. The configuration of the sleeve 138 enables the handle 132 to be easily positioned in the first position.

[0081] According to one embodiment, the control module 124 may be configured to fold the shielding structure 106 by pulling the operating member 130 through the operation of the handle 132, and to unfold the shielding structure 106 by pivoting the rod 128 around its long axis L. For example, the rod 128 may be pivoted in a first direction around the long axis L to move the movable rail 104 downward, thereby unfolding the shielding structure 106. The angular displacement of the rod 128 may be performed while the handle 132 is maintained at a first position adjacent to the end 128B of the rod 128. When the movable rail 104 is moved downward to a desired position, the rod 128 may be pivoted in a second direction opposite to the first direction around the long axis L to its initial position, thereby stopping the movable rail 104 at the desired position.

[0082] The movable rail 104 can be moved upward by the operation of moving the handle 132 away from the end 128B of the rod 128. During the process of the movable rail 104 moving upward, the user can release the handle 132 at any time, for example, when the movable rail 104 has reached the desired height or the operating member 130 has been fully extended in the rotating drum in the control module 124. When the handle 132 is released, the rotating drum in the control module 124 can pivot in the opposite direction and at least partially retract the operating member 130, thereby causing the handle 132 to move to the first position adjacent to the end 128B of the rod 128. When the handle 132 moves toward the end 128B of the rod 128, the movable rail 104 retains its position relative to the top rail 102. The above operation of pulling and releasing the handle 132 can be repeated multiple times until the shielding structure 106 is completely folded.

[0083] The control module 124 may have any structure suitable for performing the above operations. For example, the control module 124 may include one or more clutches (not shown) coupled to the rotating drum in the control module 124, and one or more brake springs (not shown) coupled to the rod 128. When the rotating drum in the control module 124 pivots toward the extension operating member 130, the one or more clutches couple the rotating drum to the drive shaft 120, so that the drive shaft 120 can pivot synchronously with the rotating drum to pull up the movable rail 104. When the rotating drum pivots toward the retracting operating member 130, the one or more clutches decouple the rotating drum from the drive shaft 120, so that the drive shaft 120 is locked by the one or more brake springs to maintain the movable rail 104 in its position. The angular displacement of the rod 128 about the long axis L can cause the one or more brake springs to unlock the drive shaft 120, and then the drive shaft 120 pivots by gravity to lower the movable rail 104. Since the control module including the clutch and the brake spring is already in the prior art, the accompanying drawings are not shown for the sake of clarity.

[0084] See also Figure 1-3 The actuation system 108 further includes a speed stabilizer 140 connected to the transmission shaft 120. The speed stabilizer 140 is adapted to reduce and stabilize the rotation speed of the transmission shaft 120. According to one embodiment, the speed stabilizer 140 may be a separate module and spaced apart from the control module 124 along the transmission shaft 120, so that the speed stabilizer 140 is easy to install and remove.

[0085] Cooperate Figure 3 , Figure 4 and Figure 5 An exploded view of the speed stabilizer 140 is shown. Figure 3-5 The speed stabilizer 140 includes a housing 142 and a rotating disk 144 carrying a plurality of friction members 146 .

[0086] The housing 142 has an inner wall 148, which at least partially defines an inner cavity 150 for accommodating the rotating disk 144 and the friction member 146. According to one embodiment, the housing 142 may include a shell portion 152A and a cover portion 152B, the shell portion 152A and the cover portion 152B are fixed to each other and at least partially define the inner cavity 150 for accommodating the rotating disk 144 and the friction member 146, and the inner wall 148 may be disposed in the shell portion 152A. The transmission shaft 120 may be configured to extend through the shell portion 152A and the cover portion 152B.

[0087] See also Figure 3-5The turntable 144 is disposed in the housing 142 and is configured to be pivotally coupled to the transmission shaft 120, so that the transmission shaft 120 and the turntable 144 can be pivotally rotated relative to the housing 142. According to one embodiment, the turntable 144 can be pivotally connected to the housing 142. For example, the turntable 144 can be in the shape of a disk having two shaft portions 154A and 154B, the shaft portions 154A and 154B protruding along the longitudinal axis 126 at opposite sides of the turntable 144, respectively, the shell portion 152A and the cover portion 152B can have two openings 156A and 156B, respectively, and the shaft portions 154A and 154B can be pivotally connected to the housing 142 through the openings 156A and 156B, respectively. In addition, the turntable 144 can also be provided with a through hole 158 extending through the shaft portions 154A and 154B, and the transmission shaft 120 can be arranged through the through hole 158. The transmission shaft 120 and the through hole 158 may have shapes corresponding to each other to pivotally couple the rotary plate 144 with the transmission shaft 120 .

[0088] The friction members 146 carried by the rotating disk 144 can be angularly spaced apart from each other around the longitudinal axis 126 of the transmission shaft 120, and the friction members 146 move together with the rotating disk 144 when the transmission shaft 120 and the rotating disk 144 are synchronously pivoted around the longitudinal axis 126. By configuring the friction members 146 on the rotating disk 144, the rotating disk 144 and the transmission shaft 120 can be synchronously pivoted relative to the housing 142 in a state where the friction members 146 rub against the inner wall 148 of the housing 142.

[0089] Each of the friction members 146 is formed as a single body and can have any suitable shape. According to one embodiment, each of the friction members 146 can be at least partially cylindrical in shape. According to another embodiment, each of the friction members 146 can be at least partially spherical in shape. Materials suitable for making the friction members 146 can include, but are not limited to, oil-resistant rubber, fluorocarbon rubber, silicone, etc.

[0090] The friction between the friction member 146 and the inner wall 148 of the housing 142 can generate friction force, which tends to reduce and stabilize the rotation speed of the transmission shaft 120. According to one embodiment, the friction member 146 and the inner wall 148 of the housing 142 can be in lubricated contact, wherein any suitable lubricant can be used. Lubricated contact helps reduce noise and wear.

[0091] See also Figure 4 , 5, the friction member 146 may be fixedly connected to a plurality of support arms 160 coupled to the rotating disk 144. Each support arm 160 and the friction member 146 fixed thereto may be configured to freely move relative to the rotating disk 144. According to one embodiment, the support arm 160 is movably connected to the rotating disk 144, and when the transmission shaft 120 and the rotating disk 144 are synchronously pivoted about the longitudinal axis 126, the support arm 160 may be biased to cause the friction member 146 to move toward the inner wall 148 of the housing 142. The movable connection between the rotating disk 144 and the support arm 160 includes, for example, but is not limited to, a pivot connection and / or a sliding connection. The connection between the rotating disk 144 and the support arm 160 allows the support arm 160 to freely move relative to the rotating disk 144.

[0092] Each of the support arms 160 may be configured as a single body to freely move relative to the turntable 144. According to one embodiment, each of the support arms 160 has a coupling end 160A and a terminal end 160B, and may be pivotally connected to the turntable 144 at the coupling end 160A. For example, the coupling end 160A of the support arm 160 may have a through hole 162, and the turntable 144 may have a pivot pin 164, and the pivot pin 164 is configured through the through hole 162, so that the support arm 160 can be pivoted relative to the turntable 144 around the pivot pin 164. Each support arm 160 may be pivotally connected to the turntable 144 in a similar manner.

[0093] Each of the support arms 160 may support at least one friction member 146. For example, a notch 166 may be provided on the outer edge of the support arm 160, and the friction member 146 may be at least partially received and fixed in the notch 166. The friction member 146 may be disposed at any suitable position on the support arm 160. According to one embodiment, the fixed position of one or more friction members 146 on the support arm 160 is closer to the coupling end 160A than the end 160B. When the support arm 160 moves relative to the rotating disk 144, the friction member 146 coupled to the support arm 160 may be urged to move and protrude from the outer edge 144A of the rotating disk 144.

[0094] In the embodiment shown in the drawings, two support arms 160 are provided, which respectively support two friction members 146. Each support arm 160 may have an arch shape, and the two support arms 160 may be configured to substantially surround the shaft portion 154B of the rotating disk 144. The two support arms 160 may be pivotally connected to the rotating disk 144 at two locations away from the longitudinal axis 126, for example, two pivot pins 164 at two diametrically opposite locations are pivotally connected to the rotating disk 144. Each of the two support arms 160 may be pivotally connected to the rotating disk 144 at its coupling end 160A, and the coupling end 160A of one of the two support arms 160 is adjacent to the end 160B of the other of the two support arms 160.

[0095] Although the illustrated embodiment is provided with two friction members 146 that are paired with two support arms 160, it should be understood that the friction members 146 and support arms 160 provided on the rotating disk 144 may be any suitable number. For example, the number of friction members 146 / support arms 160 provided on the rotating disk 144 may be one, two, three, or four, etc. In addition, the number of friction members 146 coupled to each support arm 160 may also vary. For example, the number of friction members 146 coupled to the support arm 160 may be one, two, or three, etc.

[0096] Cooperate Figure 3-5 , Figure 6 , 7 A cross-sectional view is shown of an exemplary operation of the speed stabilizer 140. When the transmission shaft 120 and the rotating disk 144 are synchronously pivoted about the longitudinal axis 126 relative to the housing 142, the support arm 160 can be biased by the centrifugal force F so that the friction member 146 presses against the inner wall 148 of the housing 142. Therefore, when the movable rail 104 moves downward due to gravity, the speed stabilizer 140 can generate friction and tend to reduce the rotation speed of the transmission shaft 120, thereby making the movable rail 104 move smoothly.

[0097] Although Figure 4 , 5 The embodiment is provided with two support arms 160 , and the number of support arms 160 can be varied according to requirements. Figure 8 FIG. 1 is an exploded view showing a modified embodiment of the present invention in which four support arms 160 are arranged in the speed stabilizer 140. Figure 8 , the turntable 144 may be provided with two pivot pins 164 to assemble the four support arms 160. As in the previous embodiment, the two pivot pins 164 may be provided on the turntable 144 at two opposite locations on the diameter relative to the longitudinal axis 126. Figure 8 Each of the two pivot pins 164 in the embodiment may have an axial length greater than that of the pivot pin 164 in the previous embodiment, and may be pivotally connected to two of the four support arms 160. Therefore, two of the four support arms 160 are adjacent to each other and may pivot relative to the rotating disk 144 around the same pivot pin 164, while the other two of the four support arms 160 are adjacent to each other and may pivot relative to the rotating disk 144 around another pivot pin 164. It is worth mentioning that when the number of support arms 160 increases, more than two support arms 160 may be pivotally connected around the same pivot pin 164. As in the previous embodiment, each support arm 160 may support at least one friction member 146. When the rotating disk 144 pivots relative to the housing 142 around the longitudinal axis 126, the support arm 160 may be biased by centrifugal force as described above, so that the friction member 146 presses against the inner wall 148 of the housing 142.

[0098] The speed stabilizer provided in the present invention has a simple structure and can be easily installed in the actuation system, so as to facilitate the smooth adjustment operation of the curtain.

[0099] The above description is based on a number of different embodiments of the present invention, wherein each feature may be implemented singly or in different combinations. Therefore, the disclosure of the embodiments of the present invention is a specific example to illustrate the principles of the present invention, and the present invention should not be limited to the disclosed embodiments. Furthermore, the above description and the accompanying drawings are merely exemplary of the present invention and are not intended to be limiting. Other variations or combinations of elements are possible without departing from the spirit and scope of the present invention.

Claims

1. A curtain actuation system, characterized in that: include: a transmission shaft having a longitudinal axis and being pivotable about said longitudinal axis; as well as Speed ​​stabilizer, including: a housing having an inner wall; as well as A turntable is disposed in the shell and configured to be pivotally coupled to the transmission shaft. The turntable carries a plurality of friction members, which are angularly spaced from each other around the longitudinal axis of the transmission shaft. The turntable can pivot synchronously with the transmission shaft when the plurality of friction members rub against the inner wall of the shell.

2. The actuation system according to claim 1, characterized in that: The plurality of friction members are in lubricating contact with the inner wall of the housing.

3. The actuation system according to claim 1, characterized in that: The turntable is coupled to a plurality of support arms, and the plurality of friction members are fixedly connected to the plurality of support arms. When the transmission shaft and the turntable pivot synchronously around the longitudinal axis, the plurality of support arms are biased to cause the plurality of friction members to move toward the inner wall of the shell.

4. The actuation system according to claim 3, characterized in that: When the transmission shaft and the rotating disk synchronously pivot about the longitudinal axis, the plurality of support arms are biased by centrifugal force, so that the plurality of friction members press the inner wall of the housing.

5. The actuation system according to claim 3, characterized in that: Each of the plurality of support arms is pivotally connected to the turntable.

6. The actuation system according to claim 5, characterized in that: The turntable has a pivot pin, and a plurality of the plurality of support arms are pivotally connected about the pivot pin.

7. The actuation system according to claim 5, characterized in that: The plurality of support arms include two support arms, and the two support arms are pivotally connected to the turntable at two locations away from the longitudinal axis respectively.

8. The actuation system according to claim 7, characterized in that: The two support arms are pivotally connected to the rotating disk at two diametrically opposite locations.

9. The actuation system according to claim 7, characterized in that: Each of the two support arms has a coupling end and a terminal end, the coupling end of each of the two support arms is pivotally connected to the turntable, and the coupling end of one of the two support arms is adjacent to the terminal end of the other of the two support arms.

10. The actuation system according to claim 9, characterized in that Each of the two support arms carries at least one of the plurality of friction members closer to its coupling end than to its distal end.

11. The actuation system according to claim 1, characterized in that: Each of the plurality of friction members is at least partially cylindrical in shape.

12. The actuation system according to claim 1, characterized in that: The materials of the plurality of friction parts include oil-resistant rubber, fluorocarbon rubber and silicone rubber.

13. The actuation system according to claim 1, characterized in that The housing comprises a shell portion and a cover portion, wherein the shell portion and the cover portion are fixedly connected to each other and at least partially define an inner cavity for accommodating the rotating disk and the plurality of friction members, and the transmission shaft extends through the shell portion and the cover portion.

14. The actuation system according to claim 1, characterized in that It also includes a control module connected to the transmission shaft, the control module being operable to cause the transmission shaft to pivot to unfold or fold the shielding structure, and the speed stabilizer and the control module are spaced apart from each other along the transmission shaft.

15. A curtain, characterized in that: include: Top rail; a shelter structure suspended from the head rail; as well as An actuation system according to any one of claims 1 to 14, mounted to the head rail, the actuation system being operable to unfold and fold the shelter structure.

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