Roller blinds driving device

Abstract

A roller blinds driving device, comprising: a main shaft (3) arranged coaxially with a rolling cylinder (2), wherein the main shaft (3) comprises a fixed end (30) and a free end (32), and the free end (32) is further fixedly provided with a main gear (34); a spring driver (4), wherein the spring driver (4) comprises a spring frame (40) fixed relative to the rolling cylinder (2) in the circumferential direction, a transmission shaft (42) pivoted on the spring frame (40), and planar scroll springs (44) assembled on the spring frame (40) and having outer ends fixed onto the transmission shaft (42), and output end of the transmission shaft (42) is coaxially and fixedly provided with a planetary gear (46) engaged with the main gear (34); and a support bushing (5). The support bushing (5) is further fixed onto the spring frame (40), the fixed end (30) of the main shaft (3) is further provided with an adjusting part (36) used for driving the main shaft (3) to rotate, an outer pin hole (50) that makes the inside and the outside of the support bushing (5) communicated is formed on the sidewall of the support bushing (5), an inner pin hole (38) is correspondingly formed on the outer sidewall of the main shaft (3), and when the main shaft (3) is driven by the adjusting part (36) to rotate until the inner pin hole (38) is aligned with the outer pin hole (50), a safety pin is inserted into the inner pin hole (38) and the outer pin hole (50) so that the main shaft (3) is fixed relative to the support bushing (5). The device can achieve automatic rolling of a blinds fabric to an initial state.

Description

Roller shutter drive Technical Field

[0001] The embodiments of the present application relate to the technical field of curtain accessories, and in particular to a roller blind drive device. Background Art

[0002] During the specific installation process of the roller blind, it is usually necessary to rotate the transmission shaft of the roller blind drive device in advance to drive the flat scroll spring to be pre-wound onto the transmission shaft to accumulate elastic potential energy and lock the transmission shaft with a safety pin so that the drive device has a predetermined driving force that can drive the curtain to rise and wind. This pre-operation is usually called pre-tightening. The pre-tightening can be performed by the manufacturer before the roller blind drive device leaves the factory, or by the end user before using the roller blind drive device to assemble the curtain. After the curtain assembly is completed, only the safety pin needs to be pulled out, and the roller blind drive device can automatically drive the winding drum to rotate to drive the curtain to rise and wind it onto the winding drum as a whole, so that the curtain is in a non-shielding state. Pulling down the curtain can make the flat scroll spring wind onto the transmission shaft again, so that the flat scroll spring of the roller blind drive device can realize the cycle of accumulating elastic potential energy and releasing elastic potential energy.

[0003] An existing roller blind drive device includes: a spring frame assembled in the winding drum relatively fixedly in the circumferential direction of the winding drum of the roller blind, a spring shaft and a transmission shaft arranged on the spring frame in parallel with the axial direction of the spring frame, a flat spiral spring wound on the spring shaft and fixed to the transmission shaft at its outer end, and a main shaft with an inner end connected to the transmission shaft and an outer end fixed relatively to the support frame; in addition, in order to effectively support the winding drum and facilitate the relative rotation of the main shaft and the winding drum, a support bushing is usually sleeved on the outer side of the main shaft and fixed relatively to one end of the winding drum in the circumferential direction. The support bushing is relatively independent of the spring frame and is not relatively fixed to each other.

[0004] However, during the specific implementation, the applicant found that when using the above-mentioned roller blind drive device to assemble curtains, since the drive shaft is not exposed, if a pre-tightening operation is to be performed, the main shaft can only be driven to drive the drive shaft to rotate and the main shaft can be locked when the operation is completed. However, there is no relatively fixed connection relationship between the support bushing, main shaft and spring frame of the above-mentioned existing roller blind drive device, and the main shaft cannot be effectively locked, resulting in the inability to effectively perform the pre-tightening operation. The user can only rotate the winding drum to reel in the curtain fabric before assembly, which is time-consuming and labor-intensive, and the user experience is poor. Technical issues

[0005] The technical problem to be solved by the embodiments of the present application is to provide a roller blind drive device that can effectively realize pre-tightening operation. Technical Solutions

[0006] In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions: a rolling curtain driving device for driving a winding drum having two ends pivotally connected to corresponding support frames and for winding curtain fabrics, comprising:

[0007] a main shaft coaxially arranged with the winding drum, the main shaft comprising a fixed end for fixing to the support frame and a free end for inserting into the winding drum, the free end further being fixed with a main gear;

[0008] a spring driver comprising a spring frame fixed relative to the winding drum in the circumferential direction, a transmission shaft pivotally mounted on the spring frame, and a planar scroll spring assembled on the spring frame and having its outer end fixed to the transmission shaft, wherein a planetary gear meshing with the main gear is coaxially fixed to the output end of the transmission shaft; and

[0009] a supporting bushing sleeved on the outer side of the main shaft and fixed relative to the winding drum in the circumferential direction;

[0010] The support bushing is also fixed on the spring frame, and the fixed end of the main shaft is also provided with an adjustment part for driving the main shaft to rotate. The side wall of the support bushing is provided with an outer pin hole connecting the inside and outside of the support bushing, and the outer side wall of the main shaft is correspondingly provided with an inner pin hole. When the main shaft is rotated by the adjustment part until the inner pin hole is aligned with the outer pin hole, a safety pin is inserted and fixed relative to the support bushing.

[0011] Furthermore, a plug-in column is protruded from the middle of the end surface of the spring frame close to the main shaft, and the plug-in column is correspondingly inserted into the end of the support bushing close to the spring frame and fixedly connected to the support bushing.

[0012] Furthermore, a fixing hole is recessed on the outer end surface of the plug-in column, and the central axis coincides with the central axis of the main shaft. A pivot hole is also provided on the plug-in column at a position deviating from the axis center, and the pivot hole passes through the plug-in column axially. One end of the shaft of the main gear is coaxially fixed to the main shaft, and the other end is inserted and fixed in the fixing hole. The output end of the transmission shaft is passed through the pivot hole, and one end of the shaft of the planetary gear is coaxially fixed to the output end.

[0013] Furthermore, the inner hole of the support bushing is in the shape of a stepped hole, including a small diameter section corresponding to accommodating the main shaft and a large diameter section corresponding to accommodating the main gear and the planetary gear. The docking portion of the small diameter section and the large diameter section is connected by an annular plate of the support bushing perpendicular to the axial direction. An axial hole is provided on the inner wall of the annular plate at the position corresponding to the shaft rod of the planetary gear, and the other end of the shaft rod of the planetary gear is pivotally connected to the axial hole.

[0014] Furthermore, one end of the small diameter section away from the large diameter section is radially protruding outward to form a flange, and the external pin hole is provided on the flange.

[0015] Furthermore, the outer side wall of the plug-in column is symmetrically protruded radially to form a plurality of positioning pins, and the inner wall of the large-diameter section is correspondingly formed with slots for inserting the positioning pins.

[0016] Furthermore, the outer diameter of the annular plate is larger than the outer diameter of the large-diameter section, and a first clamping groove for correspondingly engaging with the winding drum and being relatively fixed in the circumferential direction is formed at the edge of the annular plate.

[0017] Furthermore, the spring driver also includes a core shaft arranged parallel to the transmission shaft and pivotally mounted on the spring frame, and the inner end of the planar spiral spring is fixed on the core shaft.

[0018] Furthermore, the spring frame is provided with a plurality of partitions whose plate surfaces are perpendicular to the axial direction of the transmission shaft, thereby dividing the spring frame into a plurality of assembly grooves distributed side by side along the axial direction of the transmission shaft. The planar spiral spring is assembled in at least one assembly groove, and the transmission shaft and the core shaft pass through each of the partitions accordingly.

[0019] Furthermore, a second clamping groove is formed at the edge of the partition for correspondingly engaging with the winding drum and being relatively fixed in the circumferential direction. Beneficial effects

[0020] After adopting the above technical solution, the embodiment of the present application has at least the following beneficial effects: the embodiment of the present application fixes the support bushing to the spring frame and provides an adjustment portion at the fixed end of the main shaft. The main shaft can be rotated by the adjustment portion, thereby driving the transmission shaft to rotate and causing the planar scroll spring to be wound on the transmission shaft to a predetermined length. The safety pin is then inserted into the inner pin hole and the outer pin hole respectively, thereby achieving relative fixation of the main shaft, the support bushing, and the spring frame. This can prevent the planar scroll spring from driving the support bushing and the main shaft to rotate relative to the spring frame, thereby effectively completing the pre-tightening operation. As a result, it is convenient for users to assemble the curtain. When the curtain is assembled, they only need to pull out the safety pin, and the planar scroll spring will release its elastic potential energy to drive the transmission shaft to rotate, causing the winding drum to rotate and rewind the curtain fabric, ultimately placing the curtain fabric in a non-shielding state that is completely retracted onto the winding drum. The user no longer needs to manually rotate the winding drum to rewind the curtain fabric before assembly, thereby improving installation convenience and providing a better user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic diagram of the disassembled structure of an optional embodiment of the roller shutter driving device of the present application.

[0022] FIG2 is a schematic diagram of the assembly structure of an optional embodiment of the roller shutter driving device of the present application.

[0023] FIG3 is a schematic diagram of the assembly structure of another optional embodiment of the roller shutter driving device of the present application.

[0024] FIG4 is a schematic cross-sectional view of an optional embodiment of the roller shutter driving device of the present application.

[0025] FIG5 is a schematic structural diagram of the installation of the main shaft and the support frame of another optional embodiment of the roller shutter drive device of the present application.

[0026] FIG6 is a schematic structural diagram of the separated core shaft and transmission shaft of an optional embodiment of the roller blind drive device of the present application.

[0027] FIG7 is a schematic structural diagram of a main shaft of another optional embodiment of the roller shutter driving device of the present application.

[0028] Implementation Methods of the Application

[0029] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the following exemplary embodiments and descriptions are only used to explain the present application and are not intended to limit the present application. Moreover, the embodiments and features in the embodiments of the present application may be combined with each other unless there is a conflict.

[0030] As shown in FIG1 to FIG4 , an optional embodiment of the present application provides a roller blind driving device for driving a winding drum 2 having two ends pivotally connected to corresponding support frames 1 and for winding a curtain fabric 20, comprising:

[0031] a main shaft 3 coaxially arranged with the winding drum 2, the main shaft 3 comprising a fixed end 30 for fixing to the support frame 1 and a free end 32 for inserting into the winding drum 2, the free end 32 further being fixed with a main gear 34;

[0032] a spring driver 4 comprising a spring frame 40 fixed relative to the winding drum 2 in the circumferential direction, a transmission shaft 42 pivotally mounted on the spring frame 40, and a planar scroll spring 44 assembled on the spring frame 40 and having its outer end fixed to the transmission shaft 42; a planetary gear 46 meshing with the main gear 34 being coaxially fixed to the output end of the transmission shaft 42; and

[0033] a supporting bushing 5 sleeved on the outer side of the main shaft 3 and fixed relative to the winding drum 2 in the circumferential direction;

[0034] The support bushing 5 is also fixed on the spring frame 40. The fixed end 30 of the main shaft 3 is also provided with an adjustment part 36 for driving the main shaft 3 to rotate. The side wall of the support bushing 5 is provided with an outer pin hole 50 connecting the inside and outside of the support bushing 5. The outer side wall of the main shaft 3 is correspondingly provided with an inner pin hole 38. When the main shaft 3 is rotated by the adjustment part 36 until the inner pin hole 38 is aligned with the outer pin hole 50, a safety pin 39 is inserted and fixed relative to the support bushing 5.

[0035] The embodiment of the present application fixes the support bushing 5 on the spring frame 40 and provides an adjustment portion 36 on the fixed end 30 of the main shaft 3. The main shaft 3 can be rotated by the adjustment portion 36, thereby driving the transmission shaft 42 to rotate and causing the flat scroll spring 44 to be wound around the transmission shaft 42 to a predetermined length. The safety pin 39 is then inserted into the inner pin hole 38 and the outer pin hole 50 respectively, thereby achieving relative fixation of the main shaft 3, the support bushing 5 and the spring frame 40, and preventing the flat scroll spring 44 from driving the support bushing 5 and the main shaft 3 to rotate relative to the spring frame 40, thereby effectively completing the pre-tightening operation. In this way, it is convenient for users to assemble the curtains. When the curtains are assembled, they only need to pull out the safety pin 39, and the flat spiral spring 44 will release the elastic potential energy to drive the transmission shaft 42 to rotate, prompting the winding drum 2 to rotate and rewind the curtain 20, and finally the curtain 20 is in a non-shielding state when it is rolled up as a whole on the winding drum 2. There is no need for the user to manually rotate the winding drum 2 to rewind the curtain 20 before assembly, which improves the convenience of installation and provides a better user experience.

[0036] During specific implementation, for the convenience of user reference, a correspondence table between the number of winding turns of the planar spiral spring 44 on the transmission shaft 42 and the length of the curtain 20 can be made when the rolling shutter drive device is produced. The user can refer to the correspondence table and pre-tighten the rolling shutter drive device according to the length of the curtain 20 purchased by the user.

[0037] In an optional embodiment of the present application, as shown in Figures 1-4, a plug-in post 401 is formed protruding from the middle portion of the end surface of the spring frame 40 near the main shaft 3. The plug-in post 401 is correspondingly inserted into the end of the support bushing 5 near the spring frame 40 and fixedly connected to the support bushing 5. In this embodiment, by providing the plug-in post 401 on the end surface of the spring frame 40 near the main shaft 3, the spring frame 40 and the support bushing 5 are conveniently connected, and assembly is convenient. To achieve the connection between the plug-in post 401 and the support bushing 5, screw locking as shown in Figure 1 can be used, or a snap-on method or other method can be used to achieve connection and fixation.

[0038] In an optional embodiment of the present application, as shown in Figures 1 to 4, a fixing hole 403 is recessed on the outer end surface of the plug-in column 401, the central axis of which coincides with the central axis of the main shaft 3. The plug-in column 401 is also provided with a pivot hole 405 axially extending through the plug-in column 401 at a position offset from the axis. One end of the shaft 341 of the main gear 34 is coaxially fixed to the main shaft 3 and the other end is inserted and fixed in the fixing hole 403. The output end 421 of the transmission shaft 42 is passed through the pivot hole 405, and one end of the shaft of the planetary gear 46 is coaxially fixed to the output end 421. In this embodiment, by providing the fixing hole 403 and the pivot hole 405 on the plug-in column 401, the installation and positioning of the main gear 34 and the transmission shaft 42 are correspondingly achieved, which facilitates assembly and simplifies the assembly structure.

[0039] In an optional embodiment of the present application, as shown in Figures 1 to 4, the inner hole 52 of the support bushing 5 is in the shape of a stepped hole, including a small diameter section 521 corresponding to accommodating the main shaft 3 and a large diameter section 523 corresponding to accommodating the main gear 34 and the planetary gears 46. The small diameter section 521 and the large diameter section 523 are connected at the joint by an annular plate 54 perpendicular to the axial direction of the support bushing 5. An axial hole 541 is provided on the inner wall of the annular plate 54 at the position corresponding to the shaft of the planetary gear 46. The other end of the shaft of the planetary gear 46 is correspondingly pivoted into the axial hole 541. In this embodiment, the inner hole 52 of the support bushing 5 uses a small diameter section 521 and a large diameter section 523 to accommodate the main shaft 3, the main gear 34, and the planetary gears 46. The large diameter section 523 facilitates the assembly of the main gear 34 and the planetary gears 46 and also protects the transmission structure. In addition, the axial hole 541 is provided on the inner wall of the annular plate 54 to facilitate the assembly of the planetary gears 46.

[0040] In an optional embodiment of the present application, as shown in FIG1 , a flange 56 is formed radially outwardly at one end of the small-diameter section 521 away from the large-diameter section 523, and the outer pin hole 50 is provided on the flange 56. In this embodiment, the flange 56 can be used to shield the opening at one end of the winding drum 2, thereby preventing foreign matter from entering the interior of the winding drum 2.

[0041] In an optional embodiment of the present application, as shown in FIG1 , the outer wall of the plug post 401 further symmetrically protrudes radially to form a plurality of positioning pins 407, and the inner wall of the large-diameter section 523 is correspondingly formed with slots 525 for inserting the positioning pins 407. In this embodiment, the positioning pins 407 on the outer wall of the plug post 401 and the slots 525 in the large-diameter section 523 are plugged into each other, effectively ensuring a fixed connection between the two, plugging and positioning, and assembling is relatively simple.

[0042] In an optional embodiment of the present application, as shown in FIG1 , the outer diameter of the annular plate 54 is larger than the outer diameter of the large-diameter section 523, and a first retaining groove 541 is formed at the edge of the annular plate 54 for correspondingly engaging with the winding drum 2 to thereby secure the support bushing 5 relative to the winding drum 2 in the circumferential direction. In this embodiment, as shown in FIG1 , during implementation, the first retaining groove 541 of the annular plate 54 can be engaged with the raised rail 22 on the inner wall of the winding drum 2 to achieve circumferential relative positioning of the support bushing 5 and the winding drum 2.

[0043] In an optional embodiment of the present application, as shown in Figures 1 to 6, the spring driver 4 further includes a core shaft 48 arranged parallel to the transmission shaft 42 and pivotally mounted on the spring frame 40, and the inner end of the planar scroll spring 44 is fixed to the core shaft 48. In this embodiment, the spring driver 4 is further provided with a core shaft 48, and the inner end of the planar scroll spring 44 is fixed to the core shaft 48, thereby achieving positioning of the planar scroll spring 44 and facilitating installation.

[0044] In an optional embodiment of the present application, as shown in Figures 1 to 6, the spring frame 40 is provided with a plurality of partitions 408 whose plate surfaces are perpendicular to the axial direction of the transmission shaft 42, thereby dividing the spring frame 40 into a plurality of assembly slots 409 distributed side by side along the axial direction of the transmission shaft 42. The planar spiral spring 44 is assembled in at least one assembly slot 409, and the transmission shaft 42 and the core shaft 48 pass through each of the partitions 408. In this embodiment, by using a plurality of partitions 408 to divide the spring frame 40 into a plurality of assembly slots 409, during specific assembly, the planar spiral spring 44 can be flexibly selected to be assembled in the plurality of assembly slots 409, thereby enabling the drive device to output driving forces of different magnitudes. In addition, it is understood that during design, the number of assembly slots 409 can be reasonably selected to reduce costs and shorten the length of the spring frame 40.

[0045] In a specific implementation, as shown in Figure 6, the pivot hole 405 is set on each partition 408, and the spring frame 40 is also provided with a socket 40a passing through each partition 408. The core shaft 48 and the transmission shaft 42 are respectively inserted into the socket 40a and the pivot hole 405 from the holes at one end of the socket 40a and the pivot hole 405 away from the support frame 1. The end surface of the spring frame 4 away from the support frame 1 is also fixedly assembled with a limit cover 40b for limiting the core shaft 48 and the transmission shaft 42 to the socket 40a and the pivot hole 405 respectively.

[0046] In an optional embodiment of the present application, as shown in Figures 1-6, a second engaging groove 408a is formed on the edge of the partition 408 for correspondingly engaging with the winding drum 2 to fix it relative to the spring frame 4 in the circumferential direction. In this embodiment, as shown in Figure 1, during implementation, the second engaging groove 408a of the partition 408 can be engaged with the raised rail 22 on the inner wall of the winding drum 2 to achieve circumferential relative positioning of the spring frame 4 and the winding drum 2.

[0047] In an optional embodiment, as shown in Figure 5, the fixed end 30 of the main shaft 3 is radially protruded to form a limit plate 301 for abutting against the flange 56 to limit the length of the main shaft 3 inserted into the support bushing 5. The outer surface of the limit plate 301 is also provided with a hook 303 for hooking with the hook hole 10 on the support frame 1. The middle part of the limit plate 72 is also provided with an adjustment hole. It can be understood that the adjustment part 36 is composed of the adjustment hole or the limit plate 301. The user can insert the operating tool into the adjustment hole to rotate the main shaft 3 or manually rotate the limit plate 301, which is convenient to operate.

[0048] In another optional embodiment, as shown in Figures 1-4 and 7, the fixed end 30 of the spindle 3 is provided with a positioning hole 305 for engaging with the positioning post 12 on the support frame 1. The cross-sections of the positioning hole 305 and the positioning post 12 are mutually compatible non-circular. It is understood that the positioning hole 305 also constitutes the adjustment portion, and the user can also insert an operating tool into the adjustment hole to rotate the spindle 3, which is convenient for operation. In specific implementations, the non-circular shape can be a polygon such as a triangle or a quadrilateral. Of course, the positioning hole 305 and the positioning post 12 can also be a spline hole and spline shaft as shown in Figures 1 or 5.

[0049] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application 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 this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, which all fall within the scope of protection of this application.

Claims

1. A roller blind drive device for driving a winding drum having two ends pivotally connected to corresponding support frames and for winding a curtain fabric, the driving device comprising: a main shaft coaxially arranged with the winding drum, the main shaft comprising a fixed end for fixing to the support frame and a free end for inserting into the winding drum, the free end further being fixed with a main gear; a spring driver comprising a spring frame fixed relative to the winding drum in the circumferential direction, a transmission shaft pivotally mounted on the spring frame, and a planar scroll spring assembled on the spring frame and having its outer end fixed to the transmission shaft, wherein a planetary gear meshing with the main gear is coaxially fixed to the output end of the transmission shaft; and a supporting bushing sleeved on the outer side of the main shaft and fixed relative to the winding drum in the circumferential direction; It is characterized in that the support bushing is also fixed on the spring frame, and the fixed end of the main shaft is also provided with an adjustment part for driving the main shaft to rotate, and the side wall of the support bushing is provided with an outer pin hole connecting the inside and outside of the support bushing, and the outer side wall of the main shaft is correspondingly provided with an inner pin hole. When the main shaft is rotated by the adjustment part until the inner pin hole is aligned with the outer pin hole, a safety pin is inserted and fixed relative to the support bushing.

2. The roller blind drive device according to claim 1, wherein: A plug-in column is protruded from the middle of the end surface of the spring frame close to the main shaft, and the plug-in column is correspondingly inserted into the end of the support bushing close to the spring frame and fixedly connected to the support bushing.

3. The roller blind drive device according to claim 2, wherein: A fixing hole is recessed on the outer end surface of the plug-in column, and the central axis of the fixing hole coincides with the central axis of the main shaft. A pivot hole is also provided on the plug-in column at a position deviating from the axis center, and the pivot hole passes through the plug-in column axially. One end of the shaft of the main gear is coaxially fixed to the main shaft, and the other end is inserted and fixed in the fixing hole. The output end of the transmission shaft is passed through the pivot hole, and one end of the shaft of the planetary gear is coaxially fixed to the output end.

4. The roller blind drive device according to claim 3, wherein: The inner hole of the support bushing is in the shape of a stepped hole, including a small diameter section corresponding to accommodating the main shaft and a large diameter section corresponding to accommodating the main gear and the planetary gear. The docking parts of the small diameter section and the large diameter section are connected by an annular plate perpendicular to the axial direction of the support bushing. An axial hole is provided on the inner wall of the annular plate at the position corresponding to the shaft rod of the planetary gear, and the other end of the shaft rod of the planetary gear is pivotally connected to the axial hole.

5. The roller blind drive device according to claim 4, characterized in that: One end of the small diameter section away from the large diameter section is radially protruded outward to form a flange, and the outer pin hole is provided on the flange.

6. The roller blind drive device according to claim 4, characterized in that The outer side wall of the plug-in column further protrudes radially symmetrically to form a plurality of positioning pins, and the inner wall of the large-diameter section is correspondingly formed with slots for inserting the positioning pins.

7. The roller blind drive device according to claim 4, characterized in that: The outer diameter of the annular plate is greater than the outer diameter of the large-diameter section. A first clamping groove for correspondingly clamping with the winding drum and relatively fixing the winding drum in the circumferential direction is formed at the edge of the annular plate.

8. The roller blind drive device according to claim 1, wherein: The spring driver further comprises a core shaft which is arranged parallel to the transmission shaft and pivotally mounted on the spring frame, and the inner end of the planar spiral spring is fixed on the core shaft.

9. The roller blind drive device according to claim 8, characterized in that: The spring frame is provided with a plurality of partitions whose plate surfaces are perpendicular to the axial direction of the transmission shaft, dividing the spring frame into a plurality of assembly grooves distributed side by side along the axial direction of the transmission shaft. The planar spiral spring is assembled in at least one assembly groove, and the transmission shaft and the core shaft pass through each of the partitions accordingly.

10. The roller blind drive device according to claim 9, characterized in that A second clamping groove is formed at the edge of the partition for correspondingly clamping with the winding drum and relatively fixing it in the circumferential direction.