Roller blind and roller blind drive

Abstract

The utility model discloses an embodiment provides a kind of roller shutter and roller shutter driving device, the device includes: main shaft;Output shaft sleeve is equipped on the power mechanism of main shaft, the end surface of output shaft is equipped with several stop and the first helical surface for linking adjacent two stop, each first helical surface and the stop of two sides adjacent enclose and form recess;Sleeve is equipped on the main shaft and is inserted into winding drum and with the fixed fixedly of winding drum in circumferential direction, the end of bushing away from power mechanism is equipped with end plate, and the center of end plate is equipped with shaft hole, and the inner surface of end plate is equipped with ratchet gear;Transmission mechanism, including the clutch cylinder between output shaft and end plate and the elastic reset member of pushing clutch cylinder away from end plate, clutch cylinder one end is equipped with insertion recess and the convex tooth of abutting first helical surface and another end is equipped with the meshing portion for with ratchet gear engages, the circumferential dimension of convex tooth is less than the circumferential dimension of recess.The roller shutter driving device of the utility model embodiment is simple structure, and it is convenient to manufacture and assemble.

Description

Technical Field

[0001] This utility model relates to the field of curtain technology, and in particular to a roller blind and a roller blind drive device. Background Technology

[0002] Roller blinds typically use a drive device mounted at one end of a winding drum to rotate the drum, thus controlling the raising and lowering of the blind fabric. A typical roller blind drive device includes: a main shaft fixed to a bracket supporting one end of the winding drum; a power mechanism with its output end correspondingly sleeved on the main shaft; a bushing sleeved on the main shaft and inserted into the winding drum, circumferentially fixed to the drum; and a transmission mechanism that drives the bushing to rotate under the drive of the output shaft of the power mechanism. The transmission mechanism includes an inner drive sleeve, an outer drive sleeve rotatably sleeved outside the inner drive sleeve, a reset assembly and a clutch assembly located between the inner and outer drive sleeves. The outer drive sleeve is also connected to the output shaft of the power mechanism and can rotate under the drive of the output shaft. The top of the side wall of the outer drive sleeve is provided with a first groove, and the top of the side wall of the inner drive sleeve is provided with a second groove. The overlapping and opposite portions of the first groove and the second groove form a displacement groove. The clutch assembly includes a clutch sleeve and a spring. One end of the clutch sleeve abuts against the displacement groove, and the other end is provided with a meshing part that can engage with the inner top of the bushing. The two ends of the spring abut against the inner end walls of the clutch sleeve and the bushing, respectively.

[0003] In use, the user manually operates the power mechanism to rotate the output shaft. The output shaft then drives the outer drive sleeve to rotate relative to the inner drive sleeve, reducing the depth of the displacement groove. This causes the clutch sleeve to compress the spring and slide axially away from the drive shaft. When the clutch sleeve slides to the engagement part and engages with the bushing, it drives the bushing to rotate synchronously, ultimately causing the winding drum to rotate accordingly, allowing the curtain fabric to be wound onto the winding drum. When the user stops operating the power mechanism, the outer drive sleeve will reset under the action of the reset component, the displacement groove depth will return to its original state, and the clutch sleeve will slide back to its original state under the push of the spring and disengage from the bushing. At this time, the curtain fabric can be pulled down directly.

[0004] However, the inventors found during implementation that the existing roller shutter drive device relies on the outer drive sleeve and the inner drive sleeve to form a displacement groove. The outer drive sleeve rotates relative to the inner drive sleeve to change the depth of the displacement groove and cooperates with the reset component to realize the back-and-forth sliding of the clutch sleeve in the axial direction. Its overall structure is too complicated and not conducive to manufacturing and assembly. Utility Model Content

[0005] The technical problem to be solved by this utility model embodiment is to provide a roller blind drive device with a simple structure that is easy to manufacture and assemble.

[0006] The further technical problem to be solved by this utility model embodiment is to provide a roller blind whose driving device has a simple structure and is easy to manufacture and assemble.

[0007] To solve the above-mentioned technical problems, the present invention first provides the following technical solution: a roller shutter driving device, comprising: One end is fixed to a bracket at one end of a roller drum used to support the roller blind, while the other end extends into the roller drum. The power mechanism is assembled on the bracket at the top. The output shaft of the power mechanism is correspondingly sleeved on the main shaft. The end face of the output shaft is provided with a number of axially protruding and evenly distributed stop portions along the circumference, as well as a first helical surface for connecting two adjacent stop portions. Each first helical surface and the stop portions adjacent to its opposite sides form a groove. A bushing, fitted onto the main shaft and inserted into the winding drum, and fixed circumferentially relative to the winding drum, has an end plate at the end of the bushing away from the power mechanism. The end plate has a shaft hole at its center for the main shaft to pass through, and a ratchet gear coaxial with the shaft hole is provided on the inner surface of the end plate; and A transmission mechanism that drives the bushing to rotate under the drive of the power mechanism, the transmission mechanism comprising: A clutch cylinder, axially movably sleeved on the main shaft and positioned between the output shaft and the end plate, has a length less than the distance between the output shaft and the end plate. One end of the clutch cylinder has several protruding teeth that correspondingly insert into the grooves at the end of the output shaft and abut against the first helical surface. The other end has a meshing portion for engaging with the ratchet gear. The circumferential dimension of the protruding teeth is smaller than the circumferential dimension of the grooves. The elastic reset member has two ends that abut against the clutch cylinder and the end plate respectively to push the clutch cylinder away from the meshing part and the ratchet.

[0008] Furthermore, the end faces of each of the stops are flush with each other, and the opposite side walls of each stop have different lengths in the axial direction of the output shaft, respectively adapting and connecting with the adjacent side edges of the first helical surface located on both sides of the stop.

[0009] Furthermore, the end face of each of the protruding teeth that abuts against the first helical surface is a second helical surface adapted to the first helical surface.

[0010] Furthermore, the ratchet includes a plurality of ratchet teeth evenly distributed along the circumference and connected in sequence. Each ratchet tooth includes a first platform surface located relatively far from the clutch cylinder, a third helical surface extending from opposite sides of the first platform surface toward the clutch cylinder, and a first stop plane. The first stop plane of each ratchet tooth is connected to the third helical surface of the adjacent ratchet tooth on the corresponding side.

[0011] Furthermore, the meshing part includes a plurality of meshing teeth that are evenly distributed along the circumference and connected in sequence. Each meshing tooth includes a second platform surface located relatively close to the end plate, a fourth helical surface extending from the opposite sides of the second platform surface in a direction away from the end plate, and a second stop plane. The second stop plane of each meshing tooth is connected to the fourth helical surface of the adjacent meshing tooth on the corresponding side.

[0012] Furthermore, the clutch cylinder is a two-stage stepped shaft shape with one end being thicker and the other end being thinner. The engagement part is formed at the relatively thicker end, while the protruding tooth is formed at the relatively thinner end. The inner hole of the clutch cylinder is a stepped hole with a larger diameter at one end near the end plate and a smaller diameter at the other end. One end of the elastic reset member abuts against the connecting step surface between the large-diameter end and the small-diameter end of the stepped hole.

[0013] Furthermore, the power mechanism is a lever mechanism.

[0014] Furthermore, the roller shutter drive device also includes a bottom shell with an internal receiving cavity and an opening on one side, and a cover plate assembled to the opening of the bottom shell to cover the opening. The cover plate also has a through hole in the middle. The main shaft is formed by protruding from the middle of the shell wall on the side of the bottom shell opposite to the opening and extends through the through hole on the cover plate. The top of the power mechanism is assembled in the receiving cavity of the bottom shell, and the output shaft also extends through the through hole.

[0015] Furthermore, the outer wall of the spindle near the free end is provided with an annular groove, and the outer surface of the end plate is provided with at least two elastic hooks symmetrically around the shaft hole. The elastic hooks are correspondingly engaged in the annular groove so that the bushing and the spindle are relatively fixed in the axial direction and rotate relative to each other in the circumferential direction.

[0016] On the other hand, this utility model embodiment also provides a roller blind, including a winding cylinder, brackets for supporting opposite ends of the winding cylinder, and a drive device for driving the winding cylinder to rotate, wherein the drive device is a roller blind drive device as described in any of the above claims.

[0017] After adopting the above technical solution, the present utility model embodiment has at least the following beneficial effects: The present utility model embodiment provides a plurality of axially protruding stop portions and a first helical surface correspondingly connecting two adjacent stop portions on the end face of the output shaft of the power mechanism. Each first helical surface and the stop portions adjacent to its opposite sides form a groove, and a clutch cylinder with protruding teeth and meshing parts at both ends is provided. The protruding teeth are inserted into the groove and can move axially under the push of the first helical surface when the output shaft rotates, so that the other end of the clutch cylinder can move axially. The meshing part engages with the ratchet on the end plate of the bushing, and when the output shaft rotates to the stop part abutting against the convex tooth, it also drives the clutch cylinder to rotate synchronously, thereby driving the bushing and the winding cylinder fixed to the bushing to rotate, so as to realize the winding of the curtain. The reset elastic element can apply force to cause the clutch cylinder to slide away from the end plate and disengage from the ratchet when the power mechanism has no power output, so as not to hinder the operation of pulling down the curtain. Compared with the prior art, the roller blind drive device of this utility model embodiment has a simpler structure and is easier to manufacture and assemble. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an optional embodiment of the roller shutter of this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of the roller shutter drive device of this utility model, which is separated from the winding drum.

[0020] Figure 3 This is a schematic diagram of the internal structure of the roller shutter drive device of the present invention, showing the separation of the bushing.

[0021] Figure 4 This is a schematic diagram of the disassembled structure of an optional embodiment of the roller shutter drive device of this utility model.

[0022] Figure 5 This is a schematic diagram of the clutch cylinder of an optional embodiment of the roller shutter drive device of this utility model.

[0023] Figure 6 This is a schematic diagram of the internal structure of the bushing in an optional embodiment of the roller shutter drive device of this utility model.

[0024] Figure 7 This is a cross-sectional view of the clutch cylinder in the initial position, which is engaged only with the output shaft, according to an optional embodiment of the roller shutter drive device of this utility model.

[0025] Figure 8 This is a cross-sectional view of the clutch cylinder in a transmission position where it is engaged with the output shaft and bushing at both ends, which is another optional embodiment of the roller shutter drive device of this utility model. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the following illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention. Moreover, the embodiments and features in the embodiments of the present invention can be combined with each other unless otherwise specified.

[0027] like Figures 1-8 As shown, an optional embodiment of this utility model provides a roller shutter driving device 1, comprising: One end of the main shaft 10 is fixed to a bracket 3 at one end of the winding drum 2 used to support the roller blind, while the other end extends into the winding drum 2. The power mechanism 12 is mounted on the bracket 3 at the top. The output shaft 120 of the power mechanism 12 is correspondingly sleeved on the main shaft 10. The end face of the output shaft 120 is provided with a plurality of axially protruding and evenly distributed stop portions 122 along the circumference and a first helical surface 124 for connecting two adjacent stop portions 122. Each first helical surface 124 and the stop portions 122 adjacent to its opposite sides form a groove 126. A bushing 14 is sleeved on the main shaft 10 and inserted into the winding drum 2, and is fixed circumferentially relative to the winding drum 2. An end plate 140 is provided at the end of the bushing 14 away from the power mechanism 12. A shaft hole 142 for the main shaft 10 to pass through is provided at the center of the end plate 140. A ratchet gear 15 coaxial with the shaft hole 142 is provided on the inner surface of the end plate 140. A transmission mechanism 16 that drives the bushing 14 to rotate under the drive of the power mechanism 12, the transmission mechanism 16 comprising: A clutch cylinder 160 is axially movably sleeved on the main shaft 10 and positioned between the output shaft 120 and the end plate 140. The length of the clutch cylinder 160 is less than the distance between the output shaft 120 and the end plate 140. One end of the clutch cylinder 160 is provided with a plurality of protruding teeth 161 corresponding to the grooves 126 at the end of the output shaft 120 and abutting against the first helical surface 124. The other end is provided with a meshing part 163 for meshing with the ratchet gear 15. The circumferential dimension of the protruding teeth is smaller than the circumferential dimension of the grooves. The elastic reset member 164 abuts against the clutch cylinder 160 and the end plate 140 at both ends to push the clutch cylinder 160 and move the meshing part 163 away from the ratchet 15.

[0028] This utility model embodiment provides a plurality of axially protruding stop portions 122 and a first helical surface 124 correspondingly connecting two adjacent stop portions 122 on the end face of the output shaft 120 of the power mechanism 12. Each first helical surface 124 and the stop portions 122 adjacent to its opposite sides form a groove 126. A clutch cylinder 160 is provided with a toothed protrusion 161 and an engaging portion 163 at both ends, respectively. The toothed protrusion 161 is inserted into the groove 126 (e.g., ...). Figure 7 As shown), when the output shaft 120 rotates, the convex tooth 161 moves axially under the push of the first helical surface 124, causing the meshing part 163 at the other end of the clutch cylinder 160 to mesh with the ratchet 15 on the end plate 140 of the bushing 14 (as shown). Figure 8 As shown in the figure, when the output shaft 120 rotates to the point where the stop part 122 abuts against the convex tooth 161, it will also drive the clutch cylinder 160 to rotate synchronously, thereby driving the bushing 14 and the winding cylinder 2 which is circumferentially fixed to the bushing 14 to rotate, so as to realize the winding of the curtain. The reset elastic member 164 can apply force to cause the clutch cylinder 160 to slide away from the end plate 140 and disengage from the ratchet 15 when the power mechanism 12 has no power output, so as not to hinder the operation of pulling down the curtain. Compared with the prior art, the roller blind drive device of this utility model embodiment has a simpler structure and is easier to manufacture and assemble.

[0029] In one optional embodiment of this utility model, such as Figure 4 As shown, the end faces of each of the stop portions 122 are flush with each other, and the opposite side walls of each stop portion 122 have different lengths in the axial direction of the output shaft 120, respectively adapting and connecting with the adjacent side edges of the first helical surface 124 located on both sides of the stop portion 122. By designing the end faces of each stop portion 122 to be flush with each other and having different lengths on opposite side walls, this embodiment of the present invention can well adapt and connect with the first helical surface 124, which can drive the clutch cylinder 160 to slide axially more smoothly. Moreover, the appropriate length of the side walls of the stop portion 122 can also prevent the protrusion 161 at one end of the clutch cylinder 160 from completely disengaging from the groove 126.

[0030] In one optional embodiment of this utility model, such as Figure 5 As shown, the end face of each of the protruding teeth 161 that abuts against the first helical surface 124 is a second helical surface 1610 adapted to the first helical surface 124. In this embodiment, by designing the end face of the protruding teeth 161 as a second helical surface 1610 adapted to the first helical surface 124, the protruding teeth 161 and the first helical surface 124 can fit and abut against each other better, and the wear between the two can also be reduced.

[0031] In one optional embodiment of this utility model, such as Figure 6 As shown, the ratchet 15 includes a plurality of ratchet teeth 150 evenly distributed along the circumference and connected in sequence. Each ratchet tooth 150 includes a first platform surface 151 located relatively away from the clutch cylinder 160, a third helical surface 153 extending from opposite sides of the first platform surface 151 toward the clutch cylinder 160, and a first stop plane 155. The first stop plane 155 of each ratchet tooth 150 is connected to the third helical surface 153 of the adjacent ratchet tooth 150 on the corresponding side. In this embodiment, by designing a third helical surface 153 in each ratchet 150, the engagement portion 163 at the end of the clutch cylinder 160 can be well guided into the effective engagement position corresponding to the first stop plane 155, thereby transmitting power to the bushing 14. By setting the first platform surface 151, the ratchet 15 can be easily formed, and the axial movement stroke of the clutch cylinder 160 can be controlled, so that the engagement portion 163 and the ratchet 15 can engage and transmit power more quickly.

[0032] In one optional embodiment of this utility model, such as Figure 5 As shown, the meshing part 163 includes a plurality of meshing teeth 1630 that are evenly distributed along the circumference and connected in sequence. Each meshing tooth 1630 includes a second platform surface 1631 located relatively close to the end plate 140, a fourth helical surface 1633 extending from the opposite two sides of the second platform surface 1631 in a direction away from the end plate 140, and a second stop plane 1635. The second stop plane 1635 of each meshing tooth 1630 is connected to the fourth helical surface 1633 of the corresponding adjacent meshing tooth 1630. In this embodiment, a fourth helical surface 1633 is designed in each meshing tooth 1630, which can slide well against the third helical surface 153 of the ratchet 15, so that the clutch cylinder 160 can smoothly reach the effective meshing position where the second stop plane 1635 abuts against the first stop plane 153 of the ratchet 150, thereby transmitting power to the bushing 14. By setting the second platform surface 1631, sharp corners can be avoided, and it can cooperate with the first platform surface 151 of the ratchet 15 to control the axial movement stroke of the clutch cylinder 160, so that the meshing part 163 and the ratchet 15 can engage and transmit power more quickly.

[0033] In one optional embodiment of this utility model, such as Figure 4 and Figure 5As shown, the clutch cylinder 160 is a two-stage stepped shaft shape, thicker at one end and thinner at the other. The engagement part 163 is formed at the relatively thicker end, while the protruding tooth 161 is formed at the relatively thinner end. The inner hole of the clutch cylinder 160 is a stepped hole 1600 with a larger diameter at the end near the end plate 140 and a smaller diameter at the other end. One end of the elastic reset member 164 abuts against the connecting step surface 1603 of the large-diameter end 1601 and the small-diameter end 1602 of the stepped hole 1600. In this embodiment, the clutch cylinder 160 is set as a stepped shaft shape, and its inner hole is correspondingly a stepped hole 1600. This allows it to be well adapted to the output shaft 120 of the relatively small power mechanism 12 and the relatively large bushing 14, respectively. This facilitates the use of traditional power mechanisms 12 and bushings 14, and helps to reduce costs.

[0034] In one optional embodiment of this utility model, such as Figures 1 to 4 , Figure 7 and Figure 8 As shown, the power mechanism 12 is a lever mechanism. In this embodiment, a lever mechanism is used as the power mechanism 12. In use, simply pulling down the lever 121 of the lever mechanism will cause the output shaft 120 to rotate accordingly, thereby driving the winding drum 2 to rotate and thus driving the curtain fabric to roll up. It is understood that other mechanisms commonly found on roller blinds, such as beaded cord mechanisms, can also be used as the power mechanism 12.

[0035] In one optional embodiment of this utility model, such as Figures 1 to 4 As shown, the roller shutter drive device 1 further includes a bottom shell 18 with an internal receiving cavity 180 and an opening 181 on one side, and a cover plate 19 assembled at the opening 182 of the bottom shell 18 to cover the opening 182. A through hole 190 is also provided in the center of the cover plate 19. The main shaft 10 protrudes from the center of the shell wall of the bottom shell 18 on the side opposite to the opening 182 and extends through the through hole 190 on the cover plate 19. The top of the power mechanism 12 is assembled in the receiving cavity 180 of the bottom shell 18, and the output shaft 120 also extends through the through hole 190. This embodiment effectively prevents foreign objects from falling between the moving parts of the power mechanism 12, thus avoiding jamming and failure of the power mechanism 12. In a specific implementation, a slot 184 is provided in the middle of the outer surface of the shell wall of the bottom shell 18, which is formed with the main shaft 10. A corresponding insert 30 is provided on the bracket 3. The bracket 3 inserts the insert 30 into the slot 184 of the bottom shell 18, thereby assembling the bottom shell 18 together with the main shaft 10 onto the bracket 3.

[0036] In one optional embodiment of this utility model, such as Figures 2 to 4As shown, the outer wall of the spindle 10 near its free end is provided with an annular groove 100. At least two elastic hooks 144 are symmetrically arranged on the outer surface of the end plate 140 around the shaft hole 142. The elastic hooks 144 are correspondingly engaged within the annular groove 100, thereby fixing the bushing 14 and the spindle 10 axially and allowing them to rotate relative to each other circumferentially. This embodiment uses the elastic hooks 144 and the annular groove 100 to assemble and connect the bushing 14 and the spindle 10, resulting in a simple structure and convenient assembly operation.

[0037] On the other hand, such as Figures 1 to 8 As shown, this utility model embodiment also provides a roller blind, including a winding cylinder 2, brackets 3 for supporting the opposite ends of the winding cylinder 2 respectively, and a driving device for driving the winding cylinder 2 to rotate, wherein the driving device is the roller blind driving device 1 as described in any of the above embodiments.

[0038] The roller blind provided in this embodiment has a simpler structure for the roller blind drive device 1, which is easier to manufacture and assemble.

[0039] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many variations under the guidance of the present invention without departing from the inventive spirit and scope of protection of the claims. These variations are all within the protection scope of the present invention.

Claims

1. A roller shutter drive device, comprising: One end is fixed to a bracket at one end of a roller drum used to support the roller blind, while the other end extends into the roller drum. A power mechanism is mounted on the bracket at the top, and the output shaft of the power mechanism is sleeved on the main shaft and can rotate around the main shaft; A bushing rotatably fitted onto the main shaft and fixed circumferentially relative to the winding drum, wherein the end of the bushing away from the power mechanism is provided with an end plate, and the center of the end plate is provided with a shaft hole for the main shaft to pass through; and A transmission mechanism that drives the bushing to rotate under the drive of the power mechanism. The characteristic feature is that the end face of the output shaft is provided with a plurality of axially protruding and uniformly distributed stop portions along the circumference and a first helical surface for connecting two adjacent stop portions, and each first helical surface and the stop portions adjacent to its opposite sides form a groove. The inner surface of the end plate is provided with a ratchet gear that is coaxial with the shaft hole; The transmission mechanism includes: A clutch cylinder, axially movably sleeved on the main shaft and positioned between the output shaft and the end plate, has a length less than the distance between the output shaft and the end plate. One end of the clutch cylinder has several protruding teeth that correspondingly insert into the grooves at the end of the output shaft and abut against the first helical surface. The other end has a meshing portion for engaging with the ratchet gear. The circumferential dimension of the protruding teeth is smaller than the circumferential dimension of the grooves. The elastic reset member has two ends that abut against the clutch cylinder and the end plate respectively to push the clutch cylinder away from the meshing part and the ratchet.

2. The roller shutter driving device as described in claim 1, characterized in that, The end faces of each of the stops are flush with each other, and the opposite side walls of each stop have different lengths in the axial direction of the output shaft and are adapted to connect with the adjacent side edges of the first helical surface located on both sides of the stop.

3. The roller shutter driving device as described in claim 1, characterized in that, The end face of each of the protruding teeth that abuts against the first helical surface is a second helical surface adapted to the first helical surface.

4. The roller shutter driving device as described in claim 1, characterized in that, The ratchet includes a plurality of ratchet teeth evenly distributed along the circumference and connected in sequence. Each ratchet tooth includes a first platform surface located relatively far from the clutch cylinder, a third helical surface extending from opposite sides of the first platform surface toward the clutch cylinder, and a first stop plane. The first stop plane of each ratchet tooth is connected to the third helical surface of the adjacent ratchet tooth on the corresponding side.

5. The roller shutter drive device as described in claim 4, characterized in that, The meshing part includes a plurality of meshing teeth that are evenly distributed along the circumference and connected in sequence. Each meshing tooth includes a second platform surface located relatively close to the end plate, a fourth helical surface extending from the opposite sides of the second platform surface in a direction away from the end plate, and a second stop plane. The second stop plane of each meshing tooth is connected to the fourth helical surface of the adjacent meshing tooth on the corresponding side.

6. The roller shutter drive device as described in claim 1, characterized in that, The clutch cylinder is a two-stage stepped shaft that is thicker at one end and thinner at the other. The meshing part is formed at the relatively thicker end and the protruding tooth is formed at the relatively thinner end. The inner hole of the clutch cylinder is a stepped hole with a larger diameter at one end near the end plate and a smaller diameter at the other end. One end of the elastic reset member abuts against the connecting step surface between the large-diameter end and the small-diameter end of the stepped hole.

7. The roller shutter drive device as described in claim 1, characterized in that, The power mechanism is a lever mechanism.

8. The roller shutter drive device as described in claim 1, characterized in that, The roller shutter drive device also includes a bottom shell with an internal receiving cavity and an opening on one side, and a cover plate assembled to the opening of the bottom shell to cover the opening. The cover plate also has a through hole in the middle. The main shaft is formed by protruding from the middle of the shell wall on the side of the bottom shell opposite to the opening and extends through the through hole on the cover plate. The top of the power mechanism is assembled in the receiving cavity of the bottom shell and the output shaft also extends through the through hole.

9. The roller shutter drive device as described in claim 1, characterized in that, The outer wall of the spindle near the free end is provided with an annular groove. The outer surface of the end plate is provided with at least two elastic hooks symmetrically around the shaft hole. The elastic hooks are correspondingly engaged in the annular groove so that the bushing and the spindle are relatively fixed in the axial direction and rotate relative to each other in the circumferential direction.

10. A roller blind, comprising a winding drum, brackets for supporting opposite ends of the winding drum, and a drive device for driving the winding drum to rotate, characterized in that, The driving device is a roller blind driving device as described in any one of claims 1 to 9.

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