Roller blind and roller blind driving device

Abstract

The embodiment of the invention provides a roller shutter and a roller shutter driving device. The roller shutter driving device comprises a main shaft; the output shaft is sleeved with a power mechanism on the main shaft, the tail end face of the output shaft is provided with a plurality of blocking parts and first spiral curved surfaces used for connecting every two adjacent blocking parts, and each first spiral curved surface and the adjacent blocking parts on the two sides define a groove; the bushing sleeves the main shaft, is inserted into the winding drum and is relatively fixed with the winding drum in the circumferential direction, an end plate is arranged at one end, far away from the power mechanism, of the bushing, a shaft hole is formed in the center of the end plate, and a ratchet gear is arranged on the inner surface of the end plate; the transmission mechanism comprises a clutch cylinder arranged between the output shaft and the end plate and an elastic reset piece pushing the clutch cylinder to be far away from the end plate, one end of the clutch cylinder is provided with convex teeth inserted into the groove and abutting against the first spiral curved surface, the other end of the clutch cylinder is provided with a meshing part used for being meshed with the ratchet gear, and the circumferential size of the convex teeth is smaller than that of the groove. The roller shutter driving device is simple in structure and convenient to manufacture and assemble.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of curtain, in particular to a roller blind and a roller blind driving device. BACKGROUND

[0002] The roller blind is usually controlled by a driving device installed at one end of a winding cylinder to drive the winding cylinder to rotate so as to realize the winding and unwinding of the curtain fabric. The existing roller blind driving device mainly comprises a main shaft fixed on a bracket for supporting one end of the winding cylinder, a power mechanism with an output end corresponding to the main shaft, a bushing sleeved on the main shaft and inserted into the winding cylinder and fixed in the circumferential direction of the winding cylinder, and a transmission mechanism for driving the bushing to rotate under the driving of the output shaft of the power mechanism. The transmission mechanism comprises an inner driving sleeve, an outer driving sleeve rotatably sleeved outside the inner driving sleeve, a reset assembly and a clutch assembly arranged between the inner driving sleeve and the outer driving sleeve. The outer driving sleeve is connected with the output shaft of the power mechanism and can rotate under the driving of the output shaft. The top end of the side wall of the outer driving sleeve is provided with a first groove, and the top end of the side wall of the inner driving sleeve is provided with a second groove. The inner and outer overlapping parts of the first groove and the second groove form a displacement groove. The clutch assembly comprises a clutch sleeve and a spring. One end of the clutch sleeve is in abutment with the displacement groove, and the other end of the clutch sleeve is provided with an engaging part capable of engaging with the inner top part of the bushing. The two ends of the spring are respectively in abutment with the inner end wall of the clutch sleeve and the bushing.

[0003] In use, the user manually operates the power mechanism to rotate the output shaft, which in turn drives the outer driving sleeve to rotate relative to the inner driving sleeve, thereby reducing the depth of the displacement groove. Thus, the clutch sleeve is pushed to compress the spring and slide in the axial direction away from the driving shaft. When the engaging part of the clutch sleeve engages with the bushing, the bushing is driven to rotate synchronously, thereby finally realizing the corresponding rotation of the winding cylinder, so that the curtain fabric is wound on the winding cylinder. When the user stops operating the power mechanism, the outer driving sleeve is reset under the action of the reset assembly, the depth of the displacement groove returns to the original state, the clutch sleeve slides and resets under the pushing of the spring and is disengaged from the bushing. At this time, the curtain fabric can be directly pulled down.

[0004] However, the inventor found in the specific implementation that in the above-mentioned existing roller blind driving device, the displacement groove is formed by the cooperation of the outer driving sleeve and the inner driving sleeve, the depth of the displacement groove is changed by the rotation of the outer driving sleeve relative to the inner driving sleeve, and the back and forth sliding of the clutch sleeve in the axial direction is realized by the cooperation of the reset assembly. The overall structure is too complex, which is not conducive to manufacturing and assembly. SUMMARY

[0005] The technical problem to be solved by the embodiments of the present invention is to provide a roller blind driving device with a simple structure and easy manufacturing and assembly.

[0006] A further technical problem to be solved by the embodiments of the present invention is to provide a rolling blind whose driving device has a simple structure and is easy to manufacture and assemble.

[0007] In order to solve the above technical problems, the embodiment of the present invention first provides the following technical solution: a roller shutter driving device, comprising: A main shaft having one end fixed to a bracket for supporting one end of a winding drum for a roller blind and the other end extending into the winding drum; A power mechanism is assembled on the bracket at the top, and the output shaft of the power mechanism is correspondingly sleeved on the main shaft. The end surface of the output shaft is provided with a plurality of axially protruding stop portions evenly distributed along the circumference, and a first helical surface for connecting two adjacent stop portions, each of the first helical surfaces and the stop portions adjacent to it on two opposite sides form a groove; a bushing sleeved on the main shaft and inserted into the winding drum and fixed relative to the winding drum in the circumferential direction, wherein an end plate is provided at one end of the bushing away from the power mechanism, an axial hole for the main shaft to pass through is provided at the center of the end plate, and a ratchet gear coaxial with the axial 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 disposed between the output shaft and the end plate, wherein the length of the clutch cylinder is smaller than the spacing between the output shaft and the end plate, one end of the clutch cylinder being provided with a plurality of convex teeth correspondingly inserted into the respective grooves at the end of the output shaft and abutting against the first spiral surface, and the other end being provided with an engaging portion for engaging with the ratchet gear, wherein the circumferential dimension of the convex teeth is smaller than the circumferential dimension of the grooves; and The elastic reset member has two ends respectively abutting against the clutch cylinder and the end plate to push the clutch cylinder so as to move the meshing portion away from the ratchet gear.

[0008] Furthermore, the end faces of the respective stop portions are flush with each other, and the opposite side walls of each stop portion have different lengths in the axial direction of the output shaft and respectively fit in conjunction with adjacent side edges of the first spiral surface located on both sides of the stop portion.

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

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

[0011] Furthermore, the meshing portion includes a plurality of meshing teeth that are evenly distributed along the circumference and connected in sequence, each of the meshing teeth includes a second platform surface that is relatively close to the end plate, a fourth spiral surface and a second stop plane that extend from the opposite side edges of the second platform surface toward away from the end plate, and the second stop plane of each meshing tooth is connected to the fourth spiral surface of an adjacent meshing tooth on the corresponding side.

[0012] Furthermore, the clutch cylinder is in the shape of a two-stage stepped shaft with one end being thicker and the other end being thinner, the meshing portion is formed at the relatively thicker end and the convex teeth are formed at the relatively thinner end; the inner hole of the clutch cylinder is a stepped hole with a larger aperture at one end close to the end plate and a smaller aperture at the other end, and 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 pull rod mechanism.

[0014] Furthermore, the roller shutter drive device also includes a bottom shell having an accommodating cavity inside and an opening on one side, and a cover plate assembled at the opening of the bottom shell to cover the opening accordingly. A through hole is also opened in the middle of the cover plate. The main shaft is formed by a corresponding protrusion from the middle of the shell wall on one 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 accommodating cavity of the bottom shell and the output shaft also extends through the through hole.

[0015] Furthermore, an annular groove is provided on the outer wall of the main shaft near the free end, and at least two elastic hooks are symmetrically provided on the outer surface of the end plate around the shaft hole. The elastic hooks are correspondingly clamped in the annular groove so that the bushing and the main shaft are relatively fixed in the axial direction and relatively rotated in the circumferential direction.

[0016] On the other hand, an embodiment of the present invention further provides a roller blind, comprising a winding drum, a bracket for respectively supporting the opposite ends of the winding drum, and a driving device for driving the winding drum to rotate, wherein the driving device is a roller blind driving device as described in any one of the above items.

[0017] After adopting the above technical scheme, the embodiment of the present invention has at least the following beneficial effects: the embodiment of the present invention provides a plurality of axially protruding stop parts and a first spiral surface corresponding to the two adjacent stop parts on the end face of the output shaft of the power mechanism, and each of the first spiral surfaces and the stop parts adjacent to it on both sides form a groove, and a clutch cylinder with convex teeth and meshing parts at both ends is provided, the convex teeth are inserted into the grooves and can move axially under the push of the first spiral surface when the output shaft rotates, so that the meshing part at the other end of the clutch cylinder is meshed with the ratchet gear on the end plate of the bushing, and when the output shaft rotates until the stop part abuts against the convex teeth, it will also drive the clutch cylinder to rotate synchronously, thereby driving the bushing and the winding drum circumferentially fixed to the bushing to rotate, so as to realize the winding of the curtain, and the reset elastic member can apply force to cause the clutch cylinder to slide away from the end plate and disengage from the ratchet gear when the power mechanism has no power output, thereby not hindering the operation of pulling down the curtain. Compared with the prior art, the roller shutter drive device of the embodiment of the present invention has a simpler structure and is easy to manufacture and assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of an optional embodiment of the roller blind of the present invention.

[0019] Figure 2 It is a schematic structural diagram of the roller blind driving device and the winding drum being separated according to the present invention.

[0020] Figure 3 This is a schematic diagram of the internal structure of a roller blind drive device with the bushing separated according to an optional embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the disassembled structure of an optional embodiment of the roller shutter driving device of the present invention.

[0022] Figure 5 This is a schematic structural diagram of a clutch cylinder of an optional embodiment of the roller shutter drive device of the present invention.

[0023] Figure 6 It is a schematic diagram of the internal structure of a bushing of an optional embodiment of the roller shutter driving device of the present invention.

[0024] Figure 7 This is a cross-sectional view of an alternative embodiment of the roller blind driving device of the present invention, in which the clutch cylinder is in an initial position where it is only engaged with the output shaft.

[0025] Figure 8 This is a cross-sectional view of another optional embodiment of the roller blind driving device of the present invention, showing a clutch cylinder in a transmission position where both ends thereof are engaged with the output shaft and the bushing respectively. DETAILED DESCRIPTION

[0026] The application will be described in further detail below with reference to the drawings and specific embodiments. It should be understood that the following illustrative embodiments and description are merely intended to explain the application and are not intended to limit the application, and the embodiments in the application and the features in the embodiments can be combined with each other without conflict.

[0027] As shown in Figures 1-8 An optional embodiment of the application provides a roller blind drive device 1, comprising: a main shaft 10 fixed at one end to a bracket 3 for supporting one end of a winding drum 2 of a roller blind and extending into the winding drum 2 at the other end; a power mechanism 12 assembled on the bracket 3, an output shaft 120 of the power mechanism 12 being correspondingly sleeved on the main shaft 10, the end surface of the output shaft 120 being provided with a plurality of axially protruding and circumferentially uniformly distributed stop portions 122 and a first spiral curved surface 124 for connecting adjacent two of the stop portions 122, each of the first spiral curved surfaces 124 and the stop portions 122 adjacent to both sides thereof jointly forming a groove 126; a bushing 14 sleeved on the main shaft 10 and inserted into the winding drum 2 and fixed in the circumferential direction with the winding drum 2, an end plate 140 being provided at the end of the bushing 140 away from the power mechanism 12, a shaft hole 142 being provided at the center of the end plate 140 for the main shaft 10 to pass through, and a ratchet gear 15 being provided on the inner surface of the end plate 140 coaxially with the shaft hole 142; and a transmission mechanism 16 for rotating the bushing 14 under the drive of the power mechanism 12, the transmission mechanism 16 comprising: a clutch cylinder 160 axially movably sleeved on the main shaft 10 and disposed between the output shaft 120 and the end plate 140, the length of the clutch cylinder 160 being less than the distance between the output shaft 120 and the end plate 140, one end of the clutch cylinder 160 being provided with a plurality of protruding teeth 161 correspondingly inserted into each of the grooves 126 at the end of the output shaft 120 and abutting against the first spiral curved surface 124 and the other end being provided with an engaging portion 163 for engaging with the ratchet gear 15, the circumferential dimension of the protruding teeth being less than the circumferential dimension of the groove; and a resilient return member 164, both ends of the resilient return member 164 abutting against the clutch cylinder 160 and the end plate 140 respectively to push the clutch cylinder 160 so that the engaging portion 163 is away from the ratchet gear 15.

[0028] The embodiment of the present application sets the several axially protruding stop portions 122 on the end surface of the output shaft 120 of the power mechanism 12, and sets the first helical curved surface 124 corresponding to the adjacent two stop portions 122, and forms a recess 126 by the stop portions 122 adjacent to the two sides of the first helical curved surface 124, and sets a clutch cylinder 160 with the protruding teeth 161 and the meshing portion 163 at two ends, the protruding teeth 161 are inserted into the recess 126 (as shown in Figure 7 When the output shaft 120 rotates, the protruding teeth 161 are axially moved under the push of the first helical curved surface 124, so that the meshing portion 163 at the other end of the clutch cylinder 160 is engaged with the ratchet gear 15 on the end plate 140 of the bushing 14 (as shown in Figure 8 When the output shaft 120 rotates to the stop portion 122 and the protruding teeth 161 abut, the clutch cylinder 160 is also driven to rotate synchronously, and then drives the bushing 14 and the winding cylinder 2 fixed in the circumferential direction of the bushing 14 to rotate, so as to realize the winding of the cord, and the reset elastic member 164 can slide the clutch cylinder 160 away from the end plate 140 under the force of the power mechanism 12 without power output, so as to be disengaged from the ratchet gear 15, so as not to hinder the implementation of the cord pulling-down operation. Compared with the prior art, the roller blind driving device of the embodiment of the present application has a simpler structure, and is convenient to manufacture and assemble.

[0029] In an optional embodiment of the present application, as shown in Figure 4 The end surfaces of the stop portions 122 are flush with each other, and the opposite two side walls of each stop portion 122 have different lengths in the axial direction of the output shaft 120, and are adapted to the adjacent side edges of the first helical curved surface 124 on the two sides of the stop portion 122. The end surfaces of the stop portions 122 are designed to be flush with each other and the lengths of the opposite two side walls are different, so that the first helical curved surface 124 is well adapted and connected, the clutch cylinder 160 can be axially slid more smoothly, and the lengths of the two side walls of the stop portion 122 can also avoid the protruding teeth 161 at one end of the clutch cylinder 160 from being completely separated from the recess 126.

[0030] In an optional embodiment of the present application, as shown in Figure 5 The end surface of each protruding tooth 161 abutting with the first helical curved surface 124 is a second helical curved surface 1610 adapted to the first helical curved surface 124. The end surface of the protruding tooth 161 is also designed as the second helical curved surface 1610 adapted to the first helical curved surface 124, so that the protruding tooth 161 and the first helical curved surface 124 are better abutted, and the abrasion between the two is reduced.

[0031] In an alternative embodiment of the present application, as shown in Figure 6 The ratchet wheel 15 comprises a plurality of ratchet teeth 150 distributed uniformly along the circumference and connected in sequence, each of the ratchet teeth 150 comprises a first flat surface 151 located relatively far from the clutch cylinder 160, a third spiral surface 153 and a first stop flat surface 155 formed respectively from the opposite sides of the first flat surface 151 extending towards the clutch cylinder 160, and the first stop flat surface 155 of each of the ratchet teeth 150 is connected with the third spiral surface 153 of the adjacent ratchet tooth 150 on the corresponding side. In this embodiment, the third spiral surface 153 is designed in each of the ratchet teeth 150, which can guide the engaging part 163 at the end of the clutch cylinder 160 to enter the effective engagement position corresponding to the abutment of the first stop flat surface 155, so as to transmit power to the bushing 14, and the first flat surface 151 can facilitate the molding of the ratchet wheel 15 and control the axial movement of the clutch cylinder 160, so that the engaging part 163 and the ratchet wheel 15 can be engaged and driven faster.

[0032] In an alternative embodiment of the present application, as shown in Figure 5 The engaging part 163 comprises a plurality of engaging teeth 1630 distributed uniformly along the circumference and connected in sequence, each of the engaging teeth 1630 comprises a second flat surface 1631 located relatively close to the end plate 140, a fourth spiral surface 1633 and a second stop flat surface 1635 formed respectively from the opposite sides of the second flat surface 1631 extending away from the end plate 140, and the second stop flat surface 1635 of each of the engaging teeth 1630 is connected with the fourth spiral surface 1633 of the adjacent engaging tooth 1630 on the corresponding side. In this embodiment, the fourth spiral surface 1633 is designed in each of the engaging teeth 1630, which can abut and slide with the third spiral surface 153 of the ratchet wheel 15 to make the clutch cylinder 160 reach the effective engagement position where the second stop flat surface 1635 abuts with the first stop flat surface 153 of the ratchet tooth 150 stably, so as to transmit power to the bushing 14, and the second flat surface 1631 can avoid forming sharp corners and cooperate with the first flat surface 151 of the ratchet wheel 15 to control the axial movement of the clutch cylinder 160, so that the engaging part 163 and the ratchet wheel 15 can be engaged and driven faster.

[0033] In an alternative embodiment of the present application, as shown in Figure 4 and Figure 5As shown, the clutch cylinder 160 is shaped like a two-stepped shaft, with one end being thicker and the other being thinner. The meshing portion 163 is formed at the thicker end, while the protruding teeth 161 are formed at the thinner end. The inner hole of the clutch cylinder 160 is a stepped hole 1600, with a larger diameter at one end near the end plate 140 and a smaller diameter at the other end. One end of the elastic return member 164 abuts against the connecting step 1603 between the large-diameter end 1601 and the small-diameter end 1602 of the stepped hole 1600. In this embodiment, the clutch cylinder 160 is configured as a stepped shaft, and its inner hole is correspondingly a stepped hole 1600. This allows for good compatibility with the correspondingly smaller output shaft 120 of the power mechanism 12 and the relatively larger bushing 14, respectively. This facilitates the use of conventional power mechanisms 12 and bushings 14, and helps reduce costs.

[0034] In an optional embodiment of the present invention, Figures 1 to 4 、 Figure 7 and Figure 8 As shown, the power mechanism 12 is a pull rod mechanism. This embodiment employs a pull rod mechanism as the power mechanism 12. During operation, simply pulling down the pull rod 121 of the pull rod mechanism causes the output shaft 120 to rotate accordingly, thereby driving the winding drum 2 to rotate and, in turn, driving the curtain fabric to be wound. It is understood that other common mechanisms used in roller blinds, such as a pull rod mechanism, may also be employed as the power mechanism 12.

[0035] In an optional embodiment of the present invention, Figures 1 to 4 As shown, the roller shutter drive device 1 further includes a bottom shell 18 having an internal accommodating 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. The cover plate 19 further has a through hole 190 in the middle. The main shaft 10 is formed by protruding from the middle of the shell wall of the bottom shell 18 on the side opposite to the opening 182 and extending through the through hole 190 in the cover plate 19. The top of the power mechanism 12 is assembled in the accommodating cavity 180 of the bottom shell 18, and the output shaft 120 also extends through the through hole 190. In this embodiment, by providing a bottom shell 16 to accommodate the power mechanism 12 and using the cover plate 19 to shield it, foreign matter can be effectively prevented from falling between the movable components of the power mechanism 12, causing the power mechanism 12 to become stuck and fail. 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 on which the main shaft 10 is formed, and a corresponding plug 30 is protruded from the bracket 3. The bracket 3 is inserted into the slot 184 of the bottom shell 18 with the plug 30, thereby assembling the bottom shell 18 together with the main shaft 10 to the bracket 3.

[0036] In an optional embodiment of the present invention, Figures 2 to 4As shown, an annular groove 100 is provided on the outer wall of the spindle 10 near the free end. At least two elastic hooks 144 are symmetrically provided on the outer surface of the end plate 140 around the axial hole 142. These elastic hooks 144 are correspondingly engaged in the annular grooves 100, thereby securing the bushing 14 and the spindle 10 relative to each other in the axial direction and allowing for relative rotation in the circumferential direction. This embodiment utilizes the elastic hooks 144 in conjunction with the annular grooves 100 to achieve assembly and connection between the bushing 14 and the spindle 10, resulting in a simple structure and convenient assembly.

[0037] On the other hand, Figures 1 to 8 As shown, an embodiment of the present invention further provides a roller blind, comprising a winding drum 2, a bracket 3 for respectively supporting the opposite ends of the winding drum 2, and a driving device for driving the winding drum 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 the embodiment of the present invention has a simpler structure in the roller blind driving device 1 and is easier to manufacture and assemble.

[0039] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can make many variations without departing from the creative purpose of the present invention and the scope of protection of the claims, which all fall within the scope of protection of the present invention.

Claims

1. A roller blind driving device, comprising: A main shaft having one end fixed to a bracket for supporting one end of a winding drum for a roller blind and the other end extending into the winding drum; A power mechanism is assembled 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 sleeved on the main shaft and fixed relative to the winding drum in the circumferential direction, wherein an end plate is provided at one end of the bushing away from the power mechanism, and an axial hole for the main shaft to pass through is provided at the center of the end plate; and A transmission mechanism that drives the bushing to rotate under the drive of the power mechanism, The output shaft is characterized in that the end surface is provided with a plurality of axially protruding stop portions evenly distributed along the circumference and a first spiral surface for connecting two adjacent stop portions, and each first spiral surface and the stop portions adjacent to it on two opposite sides form a groove; A ratchet gear coaxial with the shaft hole is provided on the inner surface of the end plate; The transmission mechanism comprises: a clutch cylinder axially movably sleeved on the main shaft and disposed between the output shaft and the end plate, wherein the length of the clutch cylinder is smaller than the spacing between the output shaft and the end plate, one end of the clutch cylinder being provided with a plurality of convex teeth correspondingly inserted into the respective grooves at the end of the output shaft and abutting against the first spiral surface, and the other end being provided with an engaging portion for engaging with the ratchet gear, wherein the circumferential dimension of the convex teeth is smaller than the circumferential dimension of the grooves; and The elastic reset member has two ends respectively abutting against the clutch cylinder and the end plate to push the clutch cylinder so as to move the meshing portion away from the ratchet gear.

2. The roller blind drive device according to claim 1, wherein: The end faces of the stop parts are flush with each other, and the opposite side walls of each stop part have different lengths in the axial direction of the output shaft and respectively fit in with the adjacent side edges of the first spiral surface on both sides of the stop part.

3. The roller blind drive device according to claim 1, wherein: The end surface of each of the protruding teeth that abuts against the first helical surface is a second helical surface that matches the first helical surface.

4. The roller blind drive device according to claim 1, wherein: The ratchet gear includes a plurality of ratchet teeth evenly distributed along the circumference and connected in sequence. Each of the ratchet teeth includes a first platform surface located relatively far away from the clutch cylinder, a third spiral surface and a first stop plane extending from the opposite side edges of the first platform surface toward the clutch cylinder. The first stop plane of each ratchet tooth is connected to the third spiral surface of the adjacent ratchet tooth on the corresponding side.

5. The roller blind drive device according to claim 4, characterized in that: The meshing portion includes a plurality of meshing teeth that are evenly distributed along the circumference and connected in sequence. Each of the meshing teeth includes a second platform surface that is relatively close to the end plate, a fourth spiral surface and a second stop plane that extend from the opposite side edges of the second platform surface toward away from the end plate. The second stop plane of each meshing tooth is connected to the fourth spiral surface of an adjacent meshing tooth on the corresponding side.

6. The roller blind drive device according to claim 1, wherein: The clutch cylinder is in the shape of a two-stage stepped shaft with one end being thicker and the other end being thinner, the meshing portion is formed at the relatively thicker end and the convex teeth are formed at the relatively thinner end; the inner hole of the clutch cylinder is a stepped hole with a larger aperture at one end close to the end plate and a smaller aperture at the other end, and 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 blind drive device according to claim 1, wherein: The power mechanism is a pull rod mechanism.

8. The roller blind drive device according to claim 1, wherein: The roller shutter drive device also includes a bottom shell having an accommodating cavity inside and an opening on one side, and a cover plate assembled at the opening of the bottom shell to cover the opening accordingly. A through hole is also opened in the middle of the cover plate. The main shaft is formed by a corresponding protrusion from the middle of the shell wall on one 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 accommodating cavity of the bottom shell and the output shaft also extends through the through hole.

9. The roller blind driving device according to claim 1, wherein: An annular groove is provided on the outer wall of the main shaft near the free end, and at least two elastic hooks are symmetrically provided on the outer surface of the end plate around the shaft hole. The elastic hooks are correspondingly clamped in the annular groove so that the bushing and the main shaft are relatively fixed in the axial direction and relatively rotated in the circumferential direction.

10. A rolling blind comprising a winding drum, brackets for supporting opposite ends of the winding drum, and a driving device for driving the winding drum to rotate, wherein: The driving device is the roller blind driving device according to any one of claims 1 to 9.

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