Independent shutter turning mechanism for bead pulling wooden shutter head

Abstract

The invention discloses an independent blade turning mechanism of a bead pulling wooden shutter head, which comprises a shell, a main shaft output shaft is mounted at one end of the shell, a chain wheel is mounted at the other end of the shell, and a clutch mechanism is arranged at one end of the main shaft output shaft; the invention relates to a time delay switch, which comprises a shell, a first-stage time delay mechanism and a second-stage time delay mechanism, the first-stage time delay mechanism and the second-stage time delay mechanism are axially arranged in the shell, a central connecting shaft is arranged between the first-stage time delay mechanism and the second-stage time delay mechanism in a penetrating manner, the first-stage time delay mechanism and the second-stage time delay mechanism are linked in the axial direction, and the first-stage time delay mechanism and the second-stage time delay mechanism are linked in the axial direction. And a page turning bull gear is arranged outside the first-stage delay mechanism. Through the synergistic effect of the first-stage time delay mechanism and the second-stage time delay mechanism, independent control over shutter page turning operation and blade lifting operation is achieved, it is guaranteed that the blades do not ascend or descend in the page turning process, and therefore the problem that the positions of the blades are adjusted by mistake due to the linkage effect when the angles of the blades of a traditional shutter are adjusted is solved; and the operation experience of the user is obviously improved.

Description

Technical Field

[0001] The present invention relates to the field of wooden blinds, and particularly to an independent leaf-flipping mechanism for a pull-bead wooden blind head. Background Art

[0002] As a common sunshade and privacy protection device, the blind is widely used in places such as homes and offices. Traditional blinds usually include a plurality of blades, and the lifting and flipping of the blades are controlled by a pull bead or a pull cord. However, there is a significant problem in the operation of existing blinds: when flipping the pages (i.e., adjusting the blade angle), the lifting of the blades is often triggered simultaneously, resulting in unnecessary up and down movement of the blade position when the user adjusts the blade angle. This linkage effect not only affects the user experience but also may lead to incorrect adjustment of the blade position, increasing the complexity of the operation.

[0003] In addition, after the blade angle of existing blinds is adjusted, there is often a lack of an effective locking mechanism, resulting in the blade being prone to angle deviation when subjected to external forces or vibrations, affecting the sunshade effect and privacy protection. At the same time, after the blade is stretched, existing blinds also lack an effective locking function, resulting in the blade being prone to retraction after stretching, affecting the use effect.

[0004] Therefore, there is an urgent need for a new type of blind control mechanism that can avoid the lifting of the blades during the page-flipping operation, achieve independent control of page-flipping and lifting, and effectively lock the blade angle and position after page-flipping and stretching, improving the user experience and use effect. Summary of the Invention

[0005] To solve the above problems, the present invention provides an independent leaf-flipping mechanism for a pull-bead wooden blind head, which realizes the separation of the page-flipping operation and the blade lifting operation through the cooperation of a primary delay mechanism and a secondary delay mechanism, ensuring that the blades do not lift during the page-flipping process. At the same time, the present invention also provides functions of locking the blade angle and locking after the blade is stretched, further improving the use stability and operation convenience of the blind.

[0006] The present invention is realized through the following technical solutions: An independent leaf-flipping mechanism for a pull-bead wooden blind head, comprising: A housing, one end of the housing is installed with a main shaft output shaft, the other end is installed with a sprocket, and a clutch mechanism is provided at one end of the main shaft output shaft; A primary delay mechanism and a secondary delay mechanism, the primary delay mechanism and the secondary delay mechanism are axially arranged in the housing, a central connecting shaft is arranged through the middle of the primary delay mechanism and the secondary delay mechanism, the primary delay mechanism and the secondary delay mechanism are axially linked, and a large page-flipping gear is installed outside the primary delay mechanism; It further includes a page-turning mechanism which is located outside the large page-turning gear and meshes with the large page-turning gear for driving. When the sprocket rotates through the pull bead, time delay is carried out through the first-stage time-delay mechanism and the second-stage time-delay mechanism. During the time-delay process, the page-turning mechanism performs a page-turning action, and the output shaft of the main shaft is in a static state in the circumferential direction.

[0007] As a preferred technical solution, a first-stage planetary gear carrier is arranged at the inner side end of the first-stage time-delay mechanism. One or more first-stage planetary gears are arranged on one side of the first-stage planetary gear carrier facing the sprocket. A first-stage sun gear is arranged between the first-stage planetary gears. One end of the first-stage sun gear is axially positioned and assembled with the sprocket, and the other end meshes with each first-stage planetary gear. The large page-turning gear is installed outside the first-stage planetary gear carrier. A first fixing sleeve is positioned and installed outside the first-stage planetary gear carrier. A page-turning limit torsion spring is tightly installed outside the first fixing sleeve. A tooth convex is protrudingly arranged at the hollow position inside the large page-turning gear. The page-turning limit torsion spring has two first torsion spring legs, and the tooth convex is located between the two first torsion spring legs. The large page-turning gear is driven to rotate by the page-turning limit torsion spring.

[0008] As a preferred technical solution, a page-turning limit seat is arranged on one side of the large page-turning gear facing away from the first-stage planetary gear carrier. A first limit dial block is arranged on one side of the page-turning limit seat where the page-turning limit torsion spring is located. The first limit dial block is located outside the two first torsion spring legs. When the first limit dial block contacts one of the first torsion spring legs, a gap is generated between the page-turning limit torsion spring and the outer cylindrical surface of the first fixing sleeve and they become loose. At this time, the large page-turning gear stops rotating.

[0009] As a preferred technical solution, the first-stage time-delay mechanism includes a first-stage time-delay wheel. One end of the first-stage time-delay wheel meshes with the first-stage planetary gear carrier by gears. A protruding first-stage time-delay limit part is arranged on one side of the first-stage time-delay wheel facing away from the page-turning limit seat. A second-stage sun gear is arranged on one side of the first-stage time-delay limit part. A protruding second-stage time-delay limit part is arranged on one side of the second-stage sun gear where the first-stage time-delay limit part is located. When the first-stage time-delay wheel rotates a set angle value in the circumferential direction, the first-stage time-delay limit part contacts the second-stage time-delay limit part to realize first-stage time-delay drive.

[0010] As a preferred technical solution, a secondary planet gear carrier is provided on one side of the secondary sun gear facing away from the primary delay wheel. More than one secondary planet gear is arranged in a circle on the secondary planet gear carrier. A shift clutch sleeve is installed outside the secondary planet gear carrier. The inner ring of the shift clutch sleeve meshes with the gears of the secondary planet gears. When the shift clutch sleeve is fixed to the housing in the circumferential direction, the secondary planet gear carrier rotates circumferentially. The secondary delay mechanism is arranged on one side of the secondary planet gear carrier.

[0011] As a preferred technical solution, the secondary delay mechanism includes a secondary delay wheel. A third delay limiting portion is provided on one side of the secondary planet gear carrier facing the secondary delay wheel. A protruding fourth delay limiting portion is provided on one side of the secondary delay wheel located at the third delay limiting portion. When the secondary planet gear carrier rotates circumferentially by a set angle value, the third delay limiting portion contacts the fourth delay limiting portion to achieve secondary delay drive.

[0012] As a preferred technical solution, a second fixing sleeve is installed outside the secondary delay wheel. An arc-shaped movable cavity is provided on the outer circumferential surface of the secondary delay wheel. An extending driving portion is provided on one side of the clutch mechanism facing the second fixing sleeve. The extending driving portion extends into the arc-shaped movable cavity and a clearance cavity is formed on both sides of the extending driving portion. The inner ring of the second fixing sleeve is provided with a main shaft brake torsion spring. The main shaft brake torsion spring is provided with two second torsion spring legs. The two second torsion spring legs respectively extend into the clearance cavities formed on both sides. When the secondary delay wheel rotates, it contacts one of the second torsion spring legs of the main shaft brake torsion spring. At this time, a gap is generated between the main shaft brake torsion spring and the second fixing sleeve and they are separated. At this time, the clutch mechanism is driven to rotate circumferentially; When the clutch mechanism rotates actively, the extending driving portion of the clutch mechanism contacts one of the second torsion spring legs in the reverse direction. At this time, the main shaft brake torsion spring is loosened, and its outer diameter increases and presses against the inner wall surface of the second fixing sleeve to achieve braking. The output end of the clutch mechanism is used to connect to the up-and-down driving end of the shutter blades.

[0013] As a preferred technical solution, a tail cover is installed outside the primary planet gear. An internal meshing gear ring is provided on the inner ring of the tail cover. The internal meshing gear ring meshes with the gear of the primary planet gear.

[0014] As a preferred technical solution, the page turning mechanism includes a page turning output shaft, a page turning gear, a page turning fixed shaft, and a page turning brake torsion spring. The page turning gear meshes with the page turning large gear. One end of the page turning fixed shaft is inserted into the page turning output shaft and sleeved inside the page turning brake torsion spring. The page turning gear is located outside the page turning fixed shaft. The page turning gear meshes with the page turning large gear ring. The extending end of the page turning fixed shaft is connected to the tail cover for positioning.

[0015] As a preferred technical solution, the page-turning gear has a page-turning tooth shaft. An opening groove is provided on one side of the page-turning output shaft where the page-turning tooth shaft is located. A second limiting dial is protrudingly provided at the position of the page-turning output shaft corresponding to the opening groove. The page-turning brake torsion spring has two third torsion spring legs, and the two third torsion spring legs are located in the opening groove, and the second limiting dial is located between the two third torsion spring legs.

[0016] The beneficial effects of the present invention are as follows: The beneficial effects of the present invention are achieved through the synergistic effect of the first-stage delay mechanism and the second-stage delay mechanism, realizing the independent control of the page-turning operation and the blade lifting operation of the shutter, ensuring that the blades will not lift during the page-turning process, thus avoiding the problem of incorrect adjustment of the blade position caused by the linkage effect when adjusting the blade angle of the traditional shutter, and significantly improving the user's operation experience; at the same time, through the cooperation of mechanisms such as the page-turning limit torsion spring and the main shaft brake torsion spring, the locking function of the blade angle is realized, preventing the blade from deviating in angle due to external force or vibration after page-turning, and further enhancing the stability and sunshade effect of the shutter; in addition, the combination of the clutch mechanism and the main shaft brake torsion spring also provides the locking function after the blade is stretched, effectively preventing the blade from retracting after stretching, ensuring the stability and reliability during use; the overall structure design is compact and reasonable, the components cooperate closely, the operation is simple, it is applicable to various types of shutters, and has broad application prospects and practical value. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 It is an exploded schematic Figure 1 ; Figure 4 It is an exploded schematic Figure 2 ; Figure 5 It is a cross-sectional schematic diagram of the present invention; Figure 6 It is an internal cross-sectional schematic diagram of the page-turning mechanism of the present invention; Figure 7 It is a partial assembly schematic diagram of the page-turning large gear part of the present invention; Figure 8Schematic structural diagram of the page-turning limit seat of the present invention; Figure 9 Schematic assembly diagram of the second-stage delay wheel part of the present invention; Figure 10 Schematic assembly diagram of the first-stage delay wheel part of the present invention; Figure 11 Exploded schematic diagram of the page-turning mechanism of the present invention; Explanation of reference numerals: 1. Housing; 2. Main shaft output shaft; 22. Sprocket; 8. Clutch mechanism; 3. Page-turning large gear; 24. First-stage planetary gear carrier; 23. First-stage planetary gear; 21. First-stage sun gear; 28. First fixing sleeve; 27. Page-turning limit torsion spring; 331. Tooth convex; 11. Page-turning limit seat; 111. First limit dial; 17. First-stage delay wheel; 18. First delay limit part; 20. Second-stage sun gear; 19. Second delay limit part; 15. Second-stage planetary gear carrier; 16. Second-stage planetary gear; 10. Shift clutch sleeve; 13. Second-stage delay wheel; 161. Third delay limit part; 14. Fourth delay limit part; 9. Second fixing sleeve; 26. Main shaft brake torsion spring; 261. Second torsion spring leg; 7. Page-turning output shaft; 4. Page-turning gear; 25. Page-turning fixed shaft; 29. Page-turning brake torsion spring; 6. Page-turning tooth shaft; 99. Open slot; 71. Second limit dial; 5. Tail cover; 12. Arc-shaped movable cavity; 81. Extended drive part; 271. First torsion spring leg; 291. Third torsion spring leg. Detailed implementation manners

[0019] All features disclosed in this specification, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any manner.

[0020] Any feature disclosed in this specification (including any additional claims, abstract, and drawings), unless specifically stated, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically stated, each feature is only an example in a series of equivalent or similar features.

[0021] As Figure 1 and Figure 2 shown, an independent leaf-turning mechanism of a pull-bead wooden louver head of the present invention includes a housing 1. One end of the housing 1 is installed with a main shaft output shaft 2, and the other end is installed with a sprocket 22. One end of the main shaft output shaft 2 is provided with a clutch mechanism 8. The structure of the clutch mechanism 8 is not specifically described in the present invention. Its input end rotates circumferentially with the rotation of the sprocket 22, and the output end is connected to the lifting end of the louver; It also includes a first-stage delay mechanism and a second-stage delay mechanism. The first-stage delay mechanism and the second-stage delay mechanism are arranged axially in the housing 1. A central connecting shaft passes through the middle of the first-stage delay mechanism and the second-stage delay mechanism. The first-stage delay mechanism and the second-stage delay mechanism are linked in the axial direction. A large page-turning gear 3 is installed outside the first-stage delay mechanism. Through the first-stage delay mechanism and the second-stage delay mechanism, when the large page-turning gear 3 rotates, page-turning will be carried out first. After a certain angle of delay, the circumferential rotation of the clutch mechanism 8 will be driven. Therefore, the purpose of page-turning first and then lifting can be achieved in the whole action process; It also includes a page-turning mechanism. The page-turning mechanism is located outside the large page-turning gear 3 and is in meshing transmission with the large page-turning gear 3. When the large page-turning gear 3 rotates, it will drive the page-turning gear 4 on the page-turning mechanism to rotate, thereby achieving the purpose of turning the blades; Specifically, when the sprocket 22 rotates through the pull beads, delay is carried out through the first-stage delay mechanism and the second-stage delay mechanism. During the delay process, the page-turning mechanism performs the page-turning action. The main shaft output shaft 2 is stationary in the circumferential direction. At this time, the clutch mechanism 8 is also stationary in the circumference.

[0022] Such as Figure 3 、 Figure 4 、 Figure 5 As shown in the figure, a first-stage planet gear carrier 24 is provided at the inner side end of the first-stage delay mechanism. One or more first-stage planet gears 23 are provided on the side of the first-stage planet gear carrier 24 facing the sprocket 22. A first-stage sun gear 21 is provided in the middle of each first-stage planet gear 23. One end of the first-stage sun gear 21 is axially positioned and assembled with the sprocket 22, and the other end is meshed with each first-stage planet gear 23; The large page-turning gear 3 is installed outside the first-stage planet gear carrier 24. A first fixing sleeve 28 is positioned and installed outside the first-stage planet gear carrier 24. A page-turning limit torsion spring 27 is tightly installed outside the first fixing sleeve 28. A tooth protrusion 331 protrudes from the hollow position inside the large page-turning gear 3. The page-turning limit torsion spring 27 has two first torsion spring legs 271. The tooth protrusion 331 is located between the two first torsion spring legs 271. The large page-turning gear 3 is driven to rotate by the page-turning limit torsion spring 27. The function of the page-turning limit torsion spring 27 is to transmit power to the page-turning gear 4 during page-turning, and after page-turning is completed, it can also be disengaged from the first fixing sleeve 28, so that the circumferential rotational force of the first-stage planet gear carrier 24 no longer acts on the large page-turning gear 3, thereby stopping page-turning; Such as Figures 3 - 5 As shown in the figure, a page-turning limit seat 11 is provided on the side of the large page-turning gear 3 facing away from the first-stage planet gear carrier 24. A first limit dial 111 is provided on the side of the page-turning limit seat 11 facing the page-turning limit torsion spring 27; The first limit dial block 111 is located outside the two first torsion spring legs 271. When the first limit dial block 111 contacts one of the first torsion spring legs 271, a gap is generated between the page-turning limit torsion spring 27 and the outer cylindrical surface of the first fixed sleeve 28 and they become loose. At this time, the page-turning large gear 3 stops rotating.

[0023] The specific working principle is as follows: As Figure 5 and Figure 7 、 Figure 8 shown, the tooth convex 331 is located between the two first torsion spring legs 271. When the first-stage planet gear 23 carrier 24 rotates circumferentially, the page-turning limit torsion spring 27 rotates circumferentially following the first fixed sleeve 28 and the first-stage planet gear 23 carrier 24. At this time, one of the first torsion spring legs 271 contacts the tooth convex 331. At this time, the entire page-turning limit torsion spring 27 is locked at the position of the first torsion spring leg 271. The entire page-turning limit torsion spring 27 is locked outside the first fixed sleeve 28. At this time, the tooth convex 331 is limited by the first torsion spring leg 271 to drive the page-turning large gear 3 to rotate. The page-turning large gear 3 meshes with the page-turning gear 4 of the page-turning mechanism. At this time, the page-turning mechanism can be driven to turn pages. During this page-turning process, since the first limit dial block 111 of the page-turning limit seat 11 has not contacted one of the two first torsion spring legs 271 yet, the page-turning state is maintained at this time, that is, the circumferential force of the first-stage planet gear 23 carrier 24 can be transmitted to the page-turning large gear 3 through the page-turning limit torsion spring 27 for circumferential page-turning; Once the page-turning limit torsion spring 27 rotates circumferentially and the first torsion spring leg 271 contacts the first limit dial block 111, at this time the page-turning limit torsion spring 27 pushes the first torsion spring leg 271 in the loosening direction. The inner diameter of the page-turning limit torsion spring 27 becomes larger. At this time, the locking connection with the first fixed sleeve 28 is loosened. At this time, the circumferential rotation of the first fixed sleeve 28 will no longer be associated with the page-turning limit torsion spring 27, and the page-turning limit torsion spring 27 will no longer drive the page-turning large gear 3 to rotate. At this time, the page-turning ends.

[0024] Among them, as Figure 3 and Figure 10As shown in the figure, the first delay mechanism includes a first-stage delay wheel 17. One end of the first-stage delay wheel 17 is in gear engagement with the gear of the first-stage planetary gear 23 bracket 24. On one side of the first-stage delay wheel 17 facing away from the page-turning limit seat 11, there is a protruding first-delay limit portion 18. On one side of the first-delay limit portion 18, there is a second-stage sun gear 20. On one side of the second-stage sun gear 20 located at the first-delay limit portion 18, there is a protruding second-delay limit portion 19. When the first-stage delay wheel 17 rotates a set angular value in the circumferential direction, the first-delay limit portion 18 contacts the second-delay limit portion 19 to achieve first-stage delay drive. When turning the page, the first-delay limit portion 18 rotates within the idling range and does not contact the second-delay limit portion 19. At this time, the first-stage delay wheel 17 is driven to rotate circumferentially by the first-stage planetary gear 23 bracket 24 and does not drive the rotation of the second-stage sun gear 20. Once the first-delay limit portion 18 contacts the second-delay limit portion 19, it can drive the circumferential rotation of the second-stage sun gear 20 in the circumferential direction. The above is the first-stage delay transmission process.

[0025] In order to continue the downward transmission, on one side of the second-stage sun gear 20 facing away from the first-stage delay wheel 17, there is a second-stage planetary gear 16 bracket 15. One or more second-stage planetary gears 16 are arranged in a circle around the second-stage planetary gear 16 bracket 15. An upshift clutch sleeve 10 is installed outside the second-stage planetary gear 16 bracket 15. The inner circle of the upshift clutch sleeve 10 is in gear engagement with each second-stage planetary gear 16. When the upshift clutch sleeve 10 is fixed in the circumferential direction with the housing 1, the second-stage planetary gear 16 bracket 15 rotates circumferentially. The second-delay mechanism is arranged on one side of the second-stage planetary gear 16 bracket 15. Using the planetary gear structure, each second-stage planetary gear 16 drives the second-stage planetary gear 16 bracket 15 to rotate circumferentially. The transmission process is that the second-stage sun gear 20 drives each first-stage planetary gear 23 to rotate. Since when the upshift clutch sleeve 10 is limited in the circumferential direction and cannot rotate circumferentially, the entire planetary gear bracket rotates circumferentially along the inner wall surface of the upshift clutch sleeve 10 through the second-stage planetary gear 16.

[0026] As Figure 3 、 Figure 5 and Figure 10 shown in the figure, the second-delay mechanism includes a second-stage delay wheel 13. On one side of the second-stage planetary gear 16 bracket 15 facing the second-stage delay wheel 13, there is a third-delay limit portion 161. On one side of the second-stage delay wheel 13 located at the third-delay limit portion 161, there is a protruding fourth-delay limit portion 14. When the second-stage planetary gear 16 bracket 15 rotates a set angular value in the circumferential direction, the third-delay limit portion 161 contacts the fourth-delay limit portion 14 to achieve second-stage delay drive. When the second-stage planetary gear 16 rotates, when the third-delay limit portion 161 does not contact the fourth-delay limit portion 14, this process is an idling rotation and does not drive the second-stage delay wheel 13 to rotate circumferentially. This is the second-stage delay. Through the first-stage delay and the second-stage delay, the purpose of turning the page is finally achieved.

[0027] As Figure 3 , figures and Figure 9 shown, a second fixed sleeve 9 is installed outside the secondary delay wheel 13. An arc-shaped movable cavity 12 is provided on the outer circumferential surface of the secondary delay wheel 13. An extension driving part 81 is provided on one side of the second fixed sleeve 9 where the clutch mechanism 8 is located. The extension driving part 81 extends into the arc-shaped movable cavity 12 and a clearance cavity is formed on both sides of the extension driving part 81. A main shaft brake torsion spring 26 is provided on the inner circle of the second fixed sleeve 9. The main shaft brake torsion spring 26 is provided with two second torsion spring legs 261. The two second torsion spring legs 261 respectively extend into the clearance cavities formed on both sides. When the secondary delay wheel 13 rotates, it contacts one of the second torsion spring legs 261 of the main shaft brake torsion spring 26. At this time, a gap is generated and separated between the main shaft brake torsion spring 26 and the second fixed sleeve 9. At this time, the clutch mechanism 8 is driven to rotate circumferentially; When the clutch mechanism 8 rotates actively, the extension driving part 81 of the clutch mechanism 8 contacts one of the second torsion spring legs 261 in the reverse direction. At this time, the main shaft brake torsion spring 26 is loosened. After its outer diameter increases, it presses against the inner wall surface of the second fixed sleeve 9 to achieve braking. The output end of the clutch mechanism 8 is used to connect the up-and-down lifting driving end of the shutter blades. The active movement of the clutch mechanism 8 is the gravity of each shutter blade, which is the active movement. Therefore, through the main shaft brake torsion spring 26, the shutter blades will not automatically descend after rising, achieving the purpose of locking.

[0028] Among them, a tail cover 5 is installed outside the first-stage planetary gear 23. An internal meshing gear ring is provided on the inner circle of the tail cover 5. The internal meshing gear ring meshes with the first-stage planetary gear 23. The purpose of the internal meshing gear ring is also to utilize the planetary gear structure to make the first-stage planetary gear 23 carrier 24 rotate circumferentially.

[0029] As Figure 6 and Figure 11 shown, the page-turning mechanism includes a page-turning output shaft 7, a page-turning gear 4, a page-turning fixed shaft 25, and a page-turning brake torsion spring 29. The page-turning gear 4 meshes with the page-turning large gear 3. One end of the page-turning fixed shaft 25 is inserted into the page-turning output shaft 7 and sleeved into the page-turning brake torsion spring 29. The page-turning gear 4 is located outside the page-turning fixed shaft 25. The page-turning gear 4 meshes with the page-turning large gear ring. The extended end of the page-turning fixed shaft 25 is fixedly connected to the tail cover 5.

[0030] Among them, the page-turning gear 4 has a page-turning tooth shaft 6. An opening groove 99 is provided on one side of the page-turning tooth shaft 6 facing the page-turning output shaft 7. A second limit dial 71 protrudes from the page-turning output shaft 7 at a position corresponding to the opening groove 99. The page-turning brake torsion spring 29 has two third torsion spring legs 291. The two third torsion spring legs 291 are located in the opening groove 99. The second limit dial 71 is located between the two third torsion spring legs 291. The working principle of the page-turning brake torsion spring 29 in the page-turning mechanism is similar to that of the other two torsion springs. It also makes the inner diameter of the page-turning brake torsion spring 29 smaller or larger by triggering the torsion spring legs, and finally achieves the purpose of blade braking, so that the blade is braked and locked after page turning is completed, preventing the page from being rotated randomly.

[0031] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any change or replacement that can be thought of without creative work should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.

Claims

1. An independent leaf-turning mechanism for a wooden blind head, characterized in that: include: A housing (1), wherein a main shaft output shaft (2) is mounted on one end of the housing (1), and a sprocket (22) is mounted on the other end; a clutch mechanism (8) is disposed on one end of the main shaft output shaft (2); A first-stage delay mechanism and a second-stage delay mechanism, wherein the first-stage delay mechanism and the second-stage delay mechanism are arranged in an axial manner in the housing (1), a central connecting shaft is arranged between the first-stage delay mechanism and the second-stage delay mechanism, the first-stage delay mechanism and the second-stage delay mechanism are linked in an axial direction, and a page turning gear (3) is installed outside the first-stage delay mechanism; It also includes a page turning mechanism, which is located outside the page turning gear (3) and meshes with the page turning gear (3) for transmission; When the sprocket (22) rotates through the ball pull, the first-stage delay mechanism and the second-stage delay mechanism are used for delay, and during the delay process, the page turning mechanism performs a page turning action, and the main shaft output shaft (2) is in a stationary state in the circumferential direction.

2. The independent leaf-turning mechanism of the pull-bead wood blinds head according to claim 1 is characterized in that: A first-stage planetary wheel (23) frame (24) is provided at the inner side end of the first-stage delay mechanism, and one or more first-stage planetary wheels (23) are provided on the first-stage planetary wheel (23) frame (24) facing the sprocket wheel (22), and a first-stage sun tooth (21) is provided in the middle of each first-stage planetary wheel (23), and one end of the first-stage sun tooth (21) is axially positioned and assembled with the sprocket wheel (22), and the other end is meshed with each first-stage planetary wheel (23); The page turning gear (3) is mounted on the outside of the primary planetary gear (23) frame (24); a first fixing sleeve (28) is positioned and mounted on the outside of the primary planetary gear (23) frame (24); a page turning limit torsion spring (27) is locked and mounted on the outside of the first fixing sleeve (28); a tooth protrusion (331) is protruding from a hollow position inside the page turning gear (3); the page turning limit torsion spring (27) has two first torsion spring legs (271); the tooth protrusion (331) is located between the two first torsion spring legs (271); and the page turning limit torsion spring (27) drives the page turning gear (3) to rotate.

3. The independent leaf-turning mechanism of the pull-bead wood blinds head according to claim 2 is characterized in that: A page turning limit seat (11) is arranged on the side of the page turning gear (3) facing away from the primary planetary gear (23) frame (24); a first limit shifting block (111) is arranged on the side of the page turning limit torsion spring (27) located on the page turning limit seat (11); The first limit shift block (111) is located outside the two first torsion spring legs (271). When the first limit shift block (111) contacts one of the first torsion spring legs (271), a gap is generated between the page turning limit torsion spring (27) and the outer circumferential surface of the first fixing sleeve (28) and the page turning gear (3) is loosened. At this time, the page turning gear (3) stops rotating.

4. The independent leaf-turning mechanism of the pull-bead wood blinds head according to claim 3 is characterized in that: The first delay mechanism comprises a first-stage delay wheel (17), one end of which is meshed with the first-stage planetary wheel (23) frame (24) gear, the first-stage delay wheel (17) is provided with a protruding first delay limit portion (18) on the side facing away from the page turning limit seat (11), a second-stage sun gear (20) is provided on the side located at the first delay limit portion (18), and the second-stage sun gear (20) is provided with a protruding second delay limit portion (19) on the side located at the first delay limit portion (18), and when the first-stage delay wheel (17) rotates circumferentially by a set angle value, the first delay limit portion (18) contacts the second delay limit portion (19) to realize the first-stage delay drive.

5. The independent leaf-turning mechanism of the pull-bead wood blinds head according to claim 4 is characterized in that: A secondary planetary gear (16) frame (15) is arranged on the side of the secondary sun gear (20) facing away from the primary time delay wheel (17), and more than one secondary planetary gear (16) is arranged around the secondary planetary gear (16) frame (15). A shift clutch sleeve (10) is installed outside the secondary planetary gear (16) frame (15), and the inner ring of the shift clutch sleeve (10) is meshed with the gears of each secondary planetary gear (16). When the shift clutch sleeve (10) and the housing (1) are fixed in the circumferential direction, the secondary planetary gear (16) frame (15) rotates in a circle, and the secondary time delay mechanism is arranged on one side of the secondary planetary gear (16) frame (15).

6. The independent leaf-turning mechanism of the pull-bead wood blinds head according to claim 5 is characterized in that: The secondary delay mechanism comprises a secondary delay wheel (13); a third delay limit portion (161) is arranged on the side of the secondary planetary wheel (16) frame (15) facing the secondary delay wheel (13); a protruding fourth delay limit portion (14) is arranged on the side of the secondary delay wheel (13) located on the third delay limit portion (161); when the secondary planetary wheel (16) frame (15) rotates circumferentially by a set angle value, the third delay limit portion (161) contacts the fourth delay limit portion (14), thereby realizing secondary delay drive.

7. The independent leaf-turning mechanism of the pull-bead wood blinds head according to claim 6 is characterized in that: A second fixed sleeve (9) is installed on the outside of the secondary delay wheel (13), and an arc-shaped movable cavity (12) is arranged on the outer circumferential surface of the secondary delay wheel (13). The clutch mechanism (8) is located on one side of the second fixed sleeve (9) and is provided with an extension drive part (81). The extension drive part (81) extends into the arc-shaped movable cavity (12) and forms a gap cavity on both sides of the extension drive part (81). A main shaft brake torsion spring (26) is arranged on the inner ring of the second fixed sleeve (9). The main shaft brake torsion spring (26) is provided with two second torsion spring legs (261). The two second torsion spring legs (261) respectively extend into the gap cavities formed on both sides. When the secondary delay wheel (13) rotates, it contacts one of the second torsion spring legs (261) of the main shaft brake torsion spring (26). At this time, a gap is generated between the main shaft brake torsion spring (26) and the second fixed sleeve (9) and they are separated, and at this time, the clutch mechanism (8) is driven to rotate in a circle. When the clutch mechanism (8) actively rotates, the extended drive portion (81) of the clutch mechanism (8) contacts one of the second torsion spring legs (261) in reverse. At this time, the main shaft brake torsion spring (26) is loosened, and its outer diameter increases and is pressed against the inner wall of the second fixed sleeve (9) to achieve braking. The output end of the clutch mechanism (8) is used to connect the up and down lifting drive end of the louver.

8. The independent leaf-turning mechanism of the pull-bead wood blinds head according to claim 2 is characterized in that: A tail cover (5) is installed outside the first-stage planetary gear (23), and an inner ring of the tail cover (5) is provided with an inner meshing gear ring, which meshes with the gear of the first-stage planetary gear (23).

9. The independent leaf-turning mechanism of the pull-bead wood blinds head according to claim 1, characterized in that: The page turning mechanism comprises a page turning output shaft (7), a page turning gear (4), a page turning fixed shaft (25) and a page turning brake torsion spring (29); the page turning gear (4) is meshed with the page turning large gear (3); one end of the page turning fixed shaft (25) is inserted into the page turning output shaft (7) and is inserted into the page turning brake torsion spring (29); the page turning gear (4) is located outside the page turning fixed shaft (25); the page turning gear (4) is meshed with the page turning large gear ring; one end of the page turning fixed shaft (25) extends out to be positioned and connected with the tail cover (5).

10. The independent leaf-turning mechanism of the pull-bead wood blinds head according to claim 9, characterized in that: The page turning gear (4) has a page turning gear shaft (6), an opening groove (99) is arranged on one side of the page turning output shaft (7), a second limit shifting block (71) is protrudingly arranged on the page turning output shaft (7) at a position corresponding to the opening groove (99), the page turning brake torsion spring (29) has two third torsion spring legs (291), the two third torsion spring legs (291) are located in the opening groove (99), and the second limit shifting block (71) is located between the two third torsion spring legs (291).

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