Roller blind with tensioning device

Abstract

The application discloses a roller shutter with a tensioning device, which comprises a power source, a roller shaft, a curtain material, a length-limiting positioning member and a tensioning device; the length-limiting positioning member is used for limiting the unwinding length of the curtain material and comprises a positioning roller; the tensioning device comprises a transmission member and a transmission wheel assembly; the transmission wheel assembly comprises a transmission wheel; the transmission member is annular and surrounds the transmission wheel and the positioning roller; the power source is in transmission connection with the roller shaft; the roller shaft is connected with the transmission member through the transmission wheel assembly, so that the transmission member can rotate with the roller shaft; and the roller shaft is further connected with the transmission member through the curtain material. In the unwinding process, the curtain material can be kept in tension, flatness and non-sagging, and the application can be widely applied to various scenes, such as the installation of the roller shutter on a top surface, an inclined surface, a vertical surface and a scene requiring reverse installation.

Description

Technical Field

[0001] This invention belongs to the field of roller blinds and relates to a roller blind with a tensioning device. Background Technology

[0002] With the rapid development of science and technology, people's lifestyles are gradually changing, and the demand for sunshade products is increasing. Motorized skylight blinds are one such widely used product. Most commercially available skylight blinds are installed horizontally. Since they cannot close by gravity, most rely on retractable straps on both sides to unroll the blind. These retractable straps are under constant stress during unrolling, easily fatigued, and severely impact the lifespan of the skylight blind. Additionally, there are skylight blind products with tension springs and gas springs. These are characterized by having the tension springs and gas springs housed within the pull rod. The length of the tension springs and gas springs is limited by the length of the pull rod, so the compensation distance cannot exceed the length of the pull rod. They also suffer from spring fatigue issues. Summary of the Invention

[0003] To address the issues of sag, unevenness, and lack of tension in the curtain material after unrolling and during the unrolling process, this invention discloses a roller blind with a tensioning device, comprising a power source, a roller shaft, curtain material, a length limiting positioning component, and a tensioning device; the length limiting positioning component is used to limit the unrolling length of the curtain material and includes positioning rollers; the tensioning device includes a transmission component and a transmission wheel assembly; the transmission wheel assembly includes a transmission wheel; the transmission component is annular and surrounds the transmission wheel and the positioning rollers;

[0004] The power source is connected to the spool drive, and the spool is connected to the drive component through the drive wheel assembly, so that the drive component can rotate with the spool; the spool is also connected to the drive component through the curtain material.

[0005] In some specific implementations, the power source is located inside the reel. Further, the power source is coaxially arranged with the reel.

[0006] In some specific embodiments, the tensioning device further includes a synchronization device assembly; the synchronization device assembly includes a housing, a friction assembly, and a rotating shaft; the synchronization device assembly is connected to the reel drive.

[0007] The friction assembly includes a first friction ring and a second friction ring; a rotating shaft passes through the first and second friction rings; a second linkage component matching the outer contour of the rotating shaft is provided on the inner ring contour of the second friction ring, so that the second friction ring rotates synchronously with the rotating shaft; the first friction ring is close to the second friction ring, and the friction between the two drives the first friction ring and the second friction ring to rotate in the same direction; a first linkage component matching the inner wall of the outer ring is provided on the outer ring contour of the first friction ring, so that the outer shell rotates synchronously with the first friction ring; the synchronization device assembly is connected to the transmission component through the transmission wheel assembly.

[0008] In some specific embodiments, the housing of the synchronizing device assembly is driven to the reel; the rotating shaft of the synchronizing device assembly is driven to the transmission element via a transmission wheel assembly. Furthermore, the rotating shaft and the reel are arranged on the same axis.

[0009] In some specific implementations, the outer casing and the reel are integrally molded.

[0010] In some specific implementations, the rotating shaft of the synchronizing device assembly is driven to the reel; the housing of the synchronizing device assembly is driven to the transmission component via the transmission wheel assembly.

[0011] In some specific implementations, the shaft is a hollow shaft. Further, the hollow shaft is an octagonal tube.

[0012] In some specific embodiments, the first linkage component is integrally formed with the first friction ring, forming a part of the first friction ring. The second linkage component is integrally formed with the second friction ring, forming a part of the second friction ring.

[0013] In some specific implementations, the synchronization device assembly also includes an adjustment component; the adjustment component adjusts the frictional force between the first friction ring and the second friction ring by applying pressure to the friction assembly.

[0014] In some specific implementations, the adjusting component includes an elastic element; the elastic element controls the pressure applied to the friction assembly by the degree of elastic deformation, thereby adjusting the frictional force between the first friction ring and the second friction ring.

[0015] In some specific implementations, the elastic element is a spring.

[0016] In some specific implementations, the elastic element is fixed between the first friction ring and the second friction ring by a positioning screw; the positioning screw is connected to the first friction ring and the second friction ring, and one or both ends of the positioning screw pass through the first friction ring and / or the second friction ring. Bolts are provided at one or both ends of the positioning screw to adjust the length of the positioning screw placed between the first friction ring and the second friction ring, thereby adjusting the degree of elastic deformation of the elastic element.

[0017] In some specific implementations, the adjusting assembly further includes a first pressure-applying element; the elastic element transmits the pressure generated by elastic deformation to the friction assembly via the first pressure-applying element.

[0018] In some specific implementations, the outer contour of the first pressure-applying member is the same as the outer contour of the first friction ring, so that the first pressure-applying member can rotate with the housing.

[0019] In some specific implementations, the first pressure-applying member is annular; the inner ring profile of the first pressure-applying member is the same as the inner ring profile of the second friction ring, so that the rotating shaft can rotate with the first pressure-applying member.

[0020] In some specific implementations, the adjusting assembly further includes a second pressure-applying element; the first pressure-applying element, the elastic element, and the second pressure-applying element are arranged in sequence.

[0021] In some specific implementations, the first and second pressure-applying components are annular;

[0022] The outer contours of both the first and second pressure-applying components are the same as the outer contour of the first friction ring, allowing both the first and second pressure-applying components to rotate with the outer casing; or

[0023] The inner contours of the first and second pressure-applying components are the same as the inner contour of the second friction ring, so that the rotating shaft can rotate with the first and second pressure-applying components.

[0024] The degree of elastic deformation of the elastic element is adjusted by fasteners; the fasteners include push rods; the extension and retraction of the push rods can change the elastic deformation force on the elastic element, thereby adjusting the degree of elastic deformation of the elastic element.

[0025] In some specific embodiments, the adjusting assembly further includes a first pressure member and a second pressure member; the first pressure member, the elastic member, and the second pressure member are arranged in sequence; and fasteners are disposed on the first pressure member and / or the second pressure member.

[0026] In some specific embodiments, the adjusting assembly and the friction assembly are disposed within the space enclosed by the side wall and end plate of the housing; the push rod passes through the end plate of the housing; the first end of the push rod abuts against the adjusting assembly, and the second end of the push rod protrudes outside the end plate and is provided with a fixing member thereon to control the length of the push rod extending into the inside of the end plate. Further, the fixing member and the push rod are respectively a nut and a screw.

[0027] In some specific implementations, the first linkage component is an outwardly extending protrusion, and the inner wall of the outer casing is provided with a corresponding recess that matches the first linkage component; or the first linkage component is an inwardly recessed recess, and the inner wall of the outer casing is provided with a corresponding protrusion that matches the first linkage component; or the first linkage component includes both an outwardly extending protrusion and an inwardly recessed recess, and the inner wall of the outer casing is provided with a recess that matches the outwardly extending protrusion at the corresponding position of the outwardly extending protrusion, and a protrusion that matches the inwardly recessed recess at the corresponding position of the inwardly recessed recess.

[0028] In some specific embodiments, the inner wall profile of the outer casing is not circular, and the outer profile of the first friction ring matches the inner wall profile of the outer casing, so that the first friction ring can rotate with the outer casing; the first linkage component is a part of the outer profile of the first friction ring that matches the inner wall profile of the outer casing.

[0029] In some specific implementations, the second linkage component is an inwardly extending protrusion, and a corresponding recess is provided on the outer contour of the rotating shaft to match the second linkage component; or the second linkage component is a recess that retracts inward, and a corresponding protrusion is provided on the outer contour of the rotating shaft to match the second linkage component; or the second linkage component includes both an inwardly extending protrusion and a recess that retracts inward, with a recess matching the inwardly extending protrusion at the corresponding position on the outer contour of the rotating shaft, and a protrusion matching the recess that retracts inward at the corresponding position on the outer contour of the rotating shaft.

[0030] In some specific implementations, the outer contour of the cross-section of the shaft is not circular, and the inner contour of the second friction ring matches the outer contour of the cross-section of the shaft, so that the shaft can rotate with the second friction ring; the second linkage component is a part of the inner contour of the second friction ring that makes the inner ring contour of the second friction ring match the outer contour of the cross-section of the shaft.

[0031] In some specific implementations, the degree of elastic deformation of the elastic element is controlled by fasteners provided on the first and / or second pressure-applying elements.

[0032] In some specific implementations, the number of first or second friction rings is greater than one. The transmission effect of the housing to the rotating shaft is adjusted by changing the arrangement of the first and second friction rings to change the friction area. When it is necessary to increase the friction area between the first and second friction rings, all the first and second friction rings are arranged alternately; when it is necessary to appropriately reduce the friction area between the first and second friction rings, some of the first and second friction rings are arranged alternately; when it is necessary to minimize the friction area between the first and second friction rings to the maximum extent and the friction area is not zero, the first and second friction rings are arranged in two pairs, so that the friction area is only the area of ​​one first friction ring in contact with one second friction ring.

[0033] In some specific implementations, the number of the first friction ring and / or the second friction ring is greater than or equal to one.

[0034] In some specific implementations, the power source is located inside the reel; the power source's wires pass through the reel for connection to a power outlet.

[0035] In some specific embodiments, the drive wheel assembly further includes a pawl and a pawl support shaft; the drive wheel is a ratchet; the ratchet teeth are arranged obliquely in the same direction of rotation around the inner circumference of the ratchet, the front end of the pawl is placed inside the ratchet teeth, and the root of the pawl is located on the outer circumference of the pawl support shaft; the drive wheel assembly is configured such that: when the rotation direction of the pawl support shaft is the same as the oblique direction of the ratchet teeth, the pawl engages with the ratchet teeth, driving the ratchet and the pawl support shaft to rotate synchronously in the same direction; when the rotation direction of the pawl support shaft is opposite to the oblique direction of the ratchet teeth, the pawl slips inside the ratchet teeth, and the ratchet does not rotate synchronously with the pawl support shaft; the pawl support shaft is drivenly connected to the reel. Further, the pawl support shaft is drivenly connected to the rotating shaft.

[0036] In some specific implementations, in the right view of the ratchet, the ratchet teeth are arranged clockwise around the inner circumference of the ratchet.

[0037] In some specific implementations, in the right view of the ratchet, the ratchet teeth are arranged counterclockwise around the inner circumference of the ratchet.

[0038] In some specific implementations, each ratchet has the same tilt angle.

[0039] In some specific implementations, the tilt angles of some or all of the ratchet teeth are different.

[0040] In some specific implementations, a limiting groove is provided on the outer circumferential surface of the pawl support shaft; the limiting groove is connected to the pawl through a support member; the limiting groove is used to limit the rotation range of the pawl around the support member, so that the pawl can rotate to facilitate slippage when it slips in the ratchet teeth, and the pawl does not rotate around the support member to facilitate pushing the ratchet when it is engaged in the ratchet teeth and pushes the ratchet and the pawl support shaft to rotate synchronously.

[0041] In some specific implementations, the transmission component is a transmission belt, and the ratchet is a ratchet pulley that can cooperate with the transmission belt for transmission.

[0042] In some specific implementations, the transmission component is a transmission steel wire, and the ratchet gear is a ratchet steel wire wheel that can cooperate with the transmission steel wire for transmission.

[0043] In some specific implementations, the transmission component is a transmission chain, and the ratchet is a ratchet sprocket that can cooperate with the transmission chain for transmission. The outer contour of the ratchet sprocket is provided with protruding teeth that can engage with the gaps between the transmission chains, thereby ensuring that the transmission chain and the ratchet sprocket are synchronously transmitted without slippage.

[0044] In some specific implementations, the roller blind with tensioning device is configured such that, during unwinding, the displacement length of the transmission component is balanced to be consistent with the displacement length of the curtain material by the frictional force between the transmission component and the transmission wheel, and / or the frictional force between the roller shaft and the transmission wheel, and / or the frictional force between the roller shaft and the pawl support shaft.

[0045] In some specific implementations, the transmission wheel assembly further includes a gear shifting assembly; the gear shifting assembly includes n gear sets, sequentially numbered 1st gear set...nth gear set, where n>1; the transmission wheel assembly is configured such that the spool is driven by the gear set, the gear set is driven by the transmission wheel, and the rotational speed of the spool changes after passing through different gear sets. Further, the shaft is driven by the gear set, the gear set is driven by the transmission wheel, and the rotational speed of the shaft changes after passing through different gear sets. The ellipsis here indicates increments from 1 to n. For example, when n=4, "sequentially numbered 1st gear set...nth gear set" means sequentially 1st gear set, 2nd gear set, 3rd gear set, 4th gear set. Thus, when n takes different values ​​greater than 1, this can be deduced accordingly.

[0046] In some specific implementations, n equals 2, 3, 4, 5, 6, 7, 8, or 9.

[0047] In some specific implementations, the drive wheel is ring-shaped, with an inner ring equipped with n rows of gear tracks that match an n-speed gear set. The gear set includes at least two gears connected by transmission: a driving gear and a driven gear. The driving gear is connected to a spool, and the driven gear is mounted on the gear tracks. The diameters of the n rows of gear tracks are different, and / or the diameters of the driving gears in the n-speed gear set are different. Gear shifting on the gear tracks is performed using a mountain bike shifting method, an electromagnet method, or a servo motor method. Furthermore, the driving gear is connected to a rotating shaft.

[0048] In some specific implementations, the transmission component is a transmission belt, and the transmission wheel is a transmission pulley that can cooperate with the transmission belt for transmission.

[0049] In some specific implementations, the transmission component is a transmission steel wire, and the transmission wheel is a transmission steel wire wheel that can cooperate with the transmission steel wire for transmission.

[0050] In some specific implementations, the transmission component is a transmission chain, and the transmission wheel is a transmission sprocket that can cooperate with the transmission chain for transmission. The outer contour of the transmission sprocket is provided with protruding teeth that can engage with the gaps between the transmission chains, thereby ensuring that the transmission chain and the transmission sprocket are synchronously transmitted without slippage.

[0051] In some specific implementations, the power source is located inside the reel; the power source's wires pass through the hollow reel for connection to a power outlet.

[0052] In some specific implementations, auxiliary wheels are provided at both ends of the power source; the transmission component is also wrapped around the auxiliary wheels; the power source drives the transmission component through the auxiliary wheels, the transmission component drives the transmission wheel assembly, and the transmission wheel assembly drives the roller to rotate through the synchronization device assembly to realize the unwinding and / or winding of the curtain material.

[0053] In some specific implementation schemes, the power source is set on the axis of the positioning roller. By driving the positioning roller to rotate, the transmission component is driven to drive the transmission wheel assembly. The transmission wheel assembly then rotates through the synchronization device assembly, thereby driving the roller to rotate to realize the unwinding and / or winding of the curtain material.

[0054] In some specific implementations, the length limiting positioning component also includes a side rail; the positioning rollers and transmission components are both located inside the side rail.

[0055] In some specific implementations, the curtain material is connected to the transmission component via a bottom rail located at the bottom of the curtain material.

[0056] In some specific implementations, the roller blind with a tensioning device is configured such that, during unwinding, the displacement length of the transmission component is balanced to match the displacement length of the curtain material by the frictional force between the transmission component and the transmission wheel.

[0057] In some specific implementations, the roller blind with tensioning device is configured such that, during unwinding, the displacement length of the transmission component is balanced to match the displacement length of the curtain material by the frictional force between the roller shaft and the transmission wheel.

[0058] In some specific implementations, the roller blind with tensioning device is configured such that, during unwinding, the displacement length of the transmission element is balanced to match the displacement length of the curtain material by the frictional force between the transmission element and the transmission wheel and / or the frictional force between the roller and the transmission wheel.

[0059] In some specific embodiments, the tensioning device further includes a synchronization device assembly; the synchronization device assembly includes a housing, a friction assembly, and a rotating shaft; the friction assembly includes a first friction ring and a second friction ring; the rotating shaft passes through the first friction ring and the second friction ring; a second linkage component matching the outer contour of the rotating shaft is provided on the inner ring contour of the second friction ring, so that the second friction ring rotates synchronously with the rotating shaft; the first friction ring is close to the second friction ring, and the friction between the two drives the first friction ring and the second friction ring to rotate in the same direction; a first linkage component matching the inner wall of the housing is provided on the outer ring contour of the first friction ring, so that the housing rotates synchronously with the first friction ring;

[0060] The connection and transmission relationships of the roller blinds with tensioning devices are set to any one of the following: a1)-a4)

[0061] Method a1) The outer casing is connected to the power source via a transmission connection; the rotating shaft and the power source are mounted on the same axis; auxiliary wheels are provided at both ends of the roller; a transmission component also surrounds the auxiliary wheels; the power source transmits power to the friction assembly through the outer casing, and then to the rotating shaft, which drives the transmission wheel assembly, thereby driving the auxiliary wheels to rotate through the transmission component, and driving the roller to rotate to achieve unwinding and / or winding of the curtain material; Method a2) The rotating shaft is connected to the power source via a transmission connection; the rotating shaft and the power source are mounted on the same axis; auxiliary wheels are provided at both ends of the roller; a transmission component also surrounds the auxiliary wheels; the power source transmits power to the friction assembly through the rotating shaft, and then to the outer casing, which drives the transmission wheel assembly, thereby driving the auxiliary wheels to rotate through the transmission component, and driving the roller to rotate to achieve unwinding and / or winding of the curtain material;

[0062] Method a3) The outer shell and the transmission wheel assembly are connected by transmission; the spool and the power source are set on the same axis; auxiliary wheels are set at both ends of the spool; the transmission component is also wrapped around the auxiliary wheel; the power source is transmitted to the auxiliary wheel through the spool, and then to the transmission component, which drives the transmission wheel assembly, thereby driving the synchronization device assembly to rotate, and then the friction between the first friction ring and the second friction ring reduces the speed of the transmission component.

[0063] Method a4) The rotating shaft is connected to the transmission wheel assembly; the spool and the power source are set on the same axis; auxiliary wheels are set at both ends of the spool; the transmission component is also wrapped around the auxiliary wheel; the power source is transmitted to the auxiliary wheel through the spool, and then to the transmission component, which drives the transmission wheel assembly, thereby driving the synchronization device assembly to rotate, and then the friction between the first friction ring and the second friction ring reduces the speed of the transmission component.

[0064] In some specific implementations, the tensioning device further includes a synchronization device assembly; the synchronization device assembly includes a housing, a friction assembly, and a rotating shaft; the housing is connected to the roller in a driving connection; the rotating shaft and the roller are arranged on the same axis; the power source is arranged on the axis where the positioning roller is located, and drives the positioning roller to rotate, thereby driving the transmission component to drive the transmission wheel assembly, which in turn drives the friction assembly to rotate the housing through the rotating shaft, thereby driving the roller to rotate to realize the unwinding and / or winding of the curtain material;

[0065] The friction assembly includes a first friction ring and a second friction ring; a rotating shaft passes through the first and second friction rings; a second linkage component matching the outer contour of the rotating shaft is provided on the inner ring contour of the second friction ring, so that the second friction ring can rotate with the rotating shaft; the first friction ring is close to the second friction ring, and the friction between the two drives the first friction ring to rotate with the second friction ring; a first linkage component matching the inner wall of the outer shell is provided on the outer ring contour of the first friction ring, so that the outer shell can rotate with the first friction ring.

[0066] In some specific implementations, the radius of the cord fabric rolled on the reel is not greater than the radius of the transmission component on the drive wheel.

[0067] In some specific implementations, the curtain material is connected to the transmission component via a bottom rail located at the bottom of the curtain material.

[0068] In some specific implementations, the outer contour of the hollow shaft's cross-section is octagonal, triangular, square, rectangular, hexagonal, heptagonal, elliptical, trapezoidal, pentagonal, rhomboid, semicircular, or irregular in shape. Further, the outer contour of the hollow shaft's cross-section is a regular octagon.

[0069] In some specific implementations, there are two length-limiting positioning components, symmetrically arranged; there are two tensioning devices, symmetrically arranged. Further, there are two positioning rollers, symmetrically arranged; two transmission wheel assemblies, symmetrically arranged; two transmission components, symmetrically arranged; two synchronization device assemblies, symmetrically arranged; and two side rails, symmetrically arranged.

[0070] In some specific implementations, the drive wheels include drive wheels with successively decreasing radii, from the 1st drive wheel to the mth drive wheel, where m > 1. The drive wheels are shifted using a mountain bike shifting mechanism, an electromagnet mechanism, or a servo mechanism, allowing the transmission component to connect with drive wheels of different radii. The ellipsis here indicates increments from 1 to m. For example, when m = 4, "successively the 1st drive wheel...the mth drive wheel" means successively the 1st drive wheel, the 2nd drive wheel, the 3rd drive wheel, and the 4th drive wheel. Therefore, when m takes different values ​​greater than 1, the same principle applies.

[0071] In some specific implementation schemes, m is selected from 2-9.

[0072] In some specific embodiments, the tensioning device further includes a synchronization device assembly; the synchronization device assembly includes a housing, a friction assembly, and a rotating shaft; the housing is drive-connected to the reel; the rotating shaft and the reel are arranged on the same axis;

[0073] Auxiliary wheels are provided at both ends of the power source; the transmission component is also wrapped around the auxiliary wheels; the power source drives the transmission component through the auxiliary wheels, the transmission component drives the transmission wheel assembly, the transmission wheel assembly drives the friction component through the rotating shaft to drive the outer shell to rotate, thereby driving the roller to rotate to realize the unwinding and / or winding of the curtain material;

[0074] The friction assembly includes a first friction ring and a second friction ring; a rotating shaft passes through the first and second friction rings; a second linkage component matching the outer contour of the rotating shaft is provided on the inner ring contour of the second friction ring, so that the second friction ring can rotate with the rotating shaft; the first friction ring is close to the second friction ring, and the friction between the two drives the first friction ring to rotate with the second friction ring; a first linkage component matching the inner wall of the outer shell is provided on the outer ring contour of the first friction ring, so that the outer shell can rotate with the first friction ring.

[0075] In some specific embodiments, the tensioning device further includes a synchronization device assembly; the synchronization device assembly includes a housing, a friction assembly, and a rotating shaft; the housing is drive-connected to the power source; the rotating shaft and the power source are arranged on the same axis;

[0076] Auxiliary wheels are provided at both ends of the roller; the transmission component is also wrapped around the auxiliary wheels; the power source is transmitted to the friction component through the housing, and then to the rotating shaft, which drives the transmission wheel assembly, thereby driving the auxiliary wheels to rotate through the transmission component, and driving the roller to rotate to realize the unwinding and / or winding of the curtain material;

[0077] The friction assembly includes a first friction ring and a second friction ring; a rotating shaft passes through the first friction ring and the second friction ring; a first linkage component matching the inner wall of the outer shell is provided on the outer ring contour of the first friction ring, so that the first friction ring can rotate with the outer shell; the first friction ring is close to the second friction ring, and the friction between the two drives the second friction ring to rotate with the first friction ring; a second linkage component matching the outer contour of the rotating shaft is provided on the inner ring contour of the second friction ring, so that the rotating shaft can rotate with the second friction ring.

[0078] In some specific embodiments, the tensioning device further includes a synchronization device assembly; the synchronization device assembly includes a housing, a friction assembly, and a rotating shaft; the rotating shaft or housing is drive-connected to the transmission wheel assembly;

[0079] The friction assembly includes a first friction ring and a second friction ring; a rotating shaft passes through the first and second friction rings; a first linkage component matching the inner wall of the outer shell is provided on the outer ring contour of the first friction ring, so that the first friction ring can rotate with the outer shell or the outer shell can rotate with the first friction ring; the first friction ring is close to the second friction ring, and the friction between the two drives the second friction ring to rotate with the first friction ring or the first friction ring to rotate with the second friction ring; a second linkage component matching the outer contour of the rotating shaft is provided on the inner ring contour of the second friction ring, so that the rotating shaft can rotate with the second friction ring or the second friction ring can rotate with the rotating shaft;

[0080] The spool and the power source are set on the same axis; auxiliary wheels are set at both ends of the spool; the transmission component is also wrapped around the auxiliary wheels; the power source transmits power to the auxiliary wheels through the spool, and then to the transmission component, which drives the transmission wheel assembly, thereby driving the synchronization device assembly to rotate, and then the friction between the first friction ring and the second friction ring reduces the speed of the transmission component.

[0081] The beneficial effects of this invention are:

[0082] 1. The tensioning device ensures that the curtain material remains taut during and after unwinding. Whether the tensioning device uses friction between the transmission components and the transmission wheel, between the reel and the transmission wheel, or between the reel and the pawl support shaft, it ensures that the displacement length of the transmission components matches the displacement length of the curtain material, thus maintaining tension during unwinding. The tensioning effect is even better when a synchronization device is included, and it prevents wear on the transmission components and other parts.

[0083] 2. The synchronous device component ensures that the length of the curtain material being wound up and unwound by the rotating roller is always synchronized with the running length of the side rail, keeping the curtain material taut, flat, and without sagging. It also ensures that the curtain material roll formed during the winding process is neat and each turn is evenly tensioned.

[0084] 3. The ratchet, pawl, and pawl support shaft are configured such that: when the rotation direction is the same as the inclination direction of the ratchet teeth, the pawl engages within the ratchet teeth, driving the ratchet and pawl support shaft to rotate synchronously in the same direction; when the rotation direction is opposite to the inclination direction of the ratchet teeth, the pawl slips within the ratchet teeth, and the ratchet and pawl support shaft do not rotate synchronously. This achieves unidirectional transmission of the drive wheel assembly.

[0085] The roller blind of the present invention can keep the curtain material taut, flat and not drooping during the rolling and unrolling process (especially the unrolling process), which provides a good user experience. It can be widely used in various scenarios where roller blinds are installed on the top surface, slope, vertical surface and need to be installed in reverse (closing downward is normal installation, and closing upward is inverted installation).

[0086] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0087] Figure 1 This is a partial perspective structural diagram of an embodiment of a roller blind with a tensioning device involved in the present invention.

[0088] Figure 2 This is a schematic diagram of a structural embodiment of a roller blind with a tensioning device according to the present invention.

[0089] Figure 3 This is an exploded view of a synchronization device component in one embodiment of the present invention.

[0090] Figure 4 This is a schematic diagram of the structure of a synchronization device component in one embodiment of the present invention.

[0091] Figure 5 This is a schematic diagram of the external structure of a synchronization device component in one embodiment of the present invention.

[0092] Figure 6 This is a partial structural schematic diagram of an embodiment of a roller blind with a tensioning device involved in the present invention.

[0093] Figure 7 This is a cross-sectional view of the hollow shaft in Embodiment 1 of the present invention.

[0094] Figure 8 This is a partial structural schematic diagram of a roller blind with a tensioning device according to an embodiment of the present invention, including a drive wheel assembly.

[0095] Figure 9 This is a partial structural diagram of a roller blind with a tensioning device according to an embodiment of the present invention, including a drive wheel assembly and a synchronization device assembly.

[0096] Figure 10 This is a right view of a ratchet gear in one embodiment of a roller blind with a tensioning device according to the present invention.

[0097] Figure 11 This is a partial structural schematic diagram of the gear shifting assembly in Embodiment 10 of the roller blind with a tensioning device according to the present invention.

[0098] Figure 12 This is a partial structural schematic diagram of a roller blind with a tensioning device according to an embodiment of the present invention, including a transmission component and a ratchet.

[0099] Figure 13 This is a schematic diagram of the structure of the concealed curtain material and roller shaft of Embodiment 11 of the roller blind with tensioning device involved in the present invention.

[0100] Figure 14 This is a schematic diagram of Embodiment 15 showing the power source positioned on the axis of the positioning roller by concealing the curtain and roller.

[0101] Figure 15 This is a structural schematic diagram of embodiment 15, which shows that the power source is located on the axis of the positioning roller.

[0102] Figure 16 This is a partial structural schematic diagram of Example 16.

[0103] Figure 17 This is a structural schematic diagram of Example 18.

[0104] Figure 18 This is a partial structural schematic diagram of Example 18.

[0105] Figure 19 This is a schematic diagram of the structure of Example 19.

[0106] Figure 20 This is a partial structural schematic diagram of Example 19. Detailed Implementation

[0107] It should be understood that the terminology, specific structural and functional details used herein are merely for describing particular embodiments and are representative. However, this application may be implemented in many alternative forms and should not be construed as being limited to the embodiments set forth herein.

[0108] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implying the number of technical features indicated. Therefore, unless otherwise stated, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "several" means two or more. The term "comprising" and any variations thereof mean non-exclusive inclusion, allowing for the presence or addition of one or more other features, integers, steps, operations, units, components, and / or combinations thereof.

[0109] Furthermore, terms such as "center," "horizontal," "upper," "lower," "left," "right," "vertical," "horizontal," and "top," indicating orientation or positional relationships, are based on the orientation or relative positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention and do not indicate that the device or element referred to must have a specific orientation, or that it must have a specific orientation structure and operation. Therefore, they should not be construed as limitations on the present invention.

[0110] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0111] Example 1

[0112] like Figure 1 and 2As shown, the roller blind with a tensioning device disclosed in this embodiment includes a power source 1, a roller 2, a curtain material 3, a length limiting positioning component, and a tensioning device.

[0113] The length limiting positioning component is used to limit the unwinding length of the curtain material 3, and includes a positioning roller 7 and a side rail 6. The tensioning device includes a transmission wheel assembly 5, a transmission component 9, and a synchronization device assembly 4. Both the positioning roller 7 and the transmission component 9 are located within the side rail 6.

[0114] like Figure 8 As shown, the transmission wheel assembly 5 includes a transmission wheel 51, a pawl 52, and a pawl support shaft 53. In this embodiment, the transmission wheel 51 is a ratchet. The ratchet teeth 511 of the ratchet are arranged obliquely around the same side (i.e., obliquely around the same direction of rotation) on the inner circumferential surface of the transmission wheel 51. The front end 522 of the pawl is placed inside the ratchet teeth 511 of the ratchet, and the root 521 of the pawl is located on the outer circumferential surface of the pawl support shaft 53. The transmission wheel assembly 5 is configured such that when the rotation direction of the pawl support shaft 53 is the same as the oblique direction of the ratchet teeth 511 of the ratchet, the pawl 52 engages inside the ratchet teeth 511 of the ratchet, pushing the transmission wheel 51 and the pawl support shaft 53 to rotate synchronously in the same direction; when the rotation direction of the pawl support shaft 53 is opposite to the oblique direction of the ratchet teeth 511 of the ratchet, the pawl 52 slips inside the ratchet teeth 511 of the ratchet, and the transmission wheel 51 does not rotate synchronously with the pawl support shaft 53. On the right view of the ratchet ( Figure 10 The ratchet teeth 511 of the ratchet are arranged in a counterclockwise inclined manner around the inner circumference of the ratchet, and the inclination angle of each ratchet tooth is the same.

[0115] The transmission component 9 is ring-shaped and surrounds the transmission wheel 51 and the positioning roller 7; the power source 1 is connected to the roller 2, and the roller 2 is connected to the transmission component 9 via the curtain 3. The curtain 3 is connected to the transmission component 9 via a bottom rail 8 located at the bottom of the curtain 3. In this embodiment, the transmission component 9 is a conveyor belt; the transmission wheel 51 is a ratchet pulley. The power source 1 is a motor, including a rotor and a stator. The wire 11 of the power source 1 passes through the hollow shaft 47 for connection to a power socket. The wire 11 on the stator ( Figure 9 By connecting to the AC power outlet and turning on the switch, an electromagnetic field is generated, causing the rotor to rotate and driving the roller 2 connected to the rotor to rotate.

[0116] A limiting groove is provided on the outer circumferential surface of the pawl support shaft 53; the limiting groove is connected to the pawl 52 via the support member 523. Figure 8The limiting groove is used to limit the rotation range of the pawl 52 around the support member 523, so that the pawl 52 can rotate around the support member 523 to facilitate slippage when it slips in the ratchet teeth 511 of the ratchet gear, and also to ensure that the pawl 52 does not rotate around the support member 523 to drive the transmission wheel 51 when it is engaged in the ratchet teeth 511 of the ratchet gear and drives the transmission wheel 51 to rotate synchronously with the pawl support shaft 53.

[0117] like Figure 1 , Figures 3-6 As shown, the synchronization device assembly 4 includes a housing, a friction assembly, an adjustment assembly, and a hollow shaft 47. Both the adjustment assembly and the friction assembly are housed within the housing; the housing is drive-connected to the roller 2; the housing is also drive-connected to the hollow shaft 47 via the friction assembly. The friction assembly includes a first friction ring 42 and a second friction ring 43; the hollow shaft 47 passes through the first friction ring 42 and the second friction ring 43. A first linkage component, which is an outwardly extending protrusion, is provided on the outer ring contour of the first friction ring 42; the first linkage component matches a corresponding recess 411 on the inner wall of the housing, causing the housing and the first friction ring 42 to rotate synchronously (e.g., enabling the first friction ring 42 to rotate with the housing). The first friction ring 42 is close to the second friction ring 43, and the friction between them drives the first friction ring 42 to rotate with the second friction ring 43.

[0118] The outer contour of the cross-section of the hollow shaft 47 is a regular octagon (therefore, the hollow shaft 47 in this embodiment is also called an octagonal tube). Figure 7 The inner contour of the second friction ring 43 matches the outer contour of the cross-section of the hollow shaft 47, allowing the hollow shaft 47 to rotate with the second friction ring 43. Alternatively, it can be understood that the inner ring contour of the second friction ring 43 is provided with a second linkage component that matches the outer contour of the hollow shaft 47, causing the second friction ring 43 to rotate synchronously with the shaft (e.g., allowing the hollow shaft 47 to rotate with the second friction ring 43). The second linkage component is simply a part of the inner ring contour of the second friction ring 43 that matches the outer contour of the cross-section of the hollow shaft 47. For example, if the cross-section of the inner ring contour of the second friction ring 43 is circular, the presence of the second linkage component makes the cross-section of the inner contour of the second friction ring 43 a regular octagon that matches the outer contour of the cross-section of the hollow shaft 47.

[0119] The first friction ring 42 is close to the second friction ring 43, and the friction between them causes the first friction ring 42 and the second friction ring 43 to rotate in the same direction. The adjusting component adjusts the friction between the first friction ring 42 and the second friction ring 43 by applying pressure to the friction component. The hollow shaft 47 is connected to the pawl support shaft 53, so that the pawl support shaft 53 can rotate with the hollow shaft 47.

[0120] The adjusting assembly includes a first pressure-applying member 44, an elastic member 45, and a second pressure-applying member 46 arranged sequentially. The adjusting assembly changes the pressure applied to the friction assembly by extending and retracting the elastic member 45, thereby adjusting the frictional force between the first friction ring 42 and the second friction ring 43. The outer contours of the first pressure-applying member 44 and the second pressure-applying member 46 are the same as the outer contour of the first friction ring 42, allowing both the first pressure-applying member 44 and the second pressure-applying member 46 to rotate with the outer casing. The first pressure-applying member 44 and the second pressure-applying member 46 are annular. The fasteners are bolts. The first friction ring 42, the second friction ring 43, the first pressure-applying member 44, and / or the second pressure-applying member 46 are made of brake pads.

[0121] The elastic element 45 is a spring. The degree of elastic deformation of the elastic element 45 is adjusted by a fastener. The fastener includes a push rod 413 and a fixing member 414. The extension and retraction of the push rod 413 can change the elastic deformation force on the elastic element 45, thereby adjusting the degree of elastic deformation of the elastic element 45. The adjusting assembly and the friction assembly are disposed in the space enclosed by the side wall 415 of the housing and the end plate 412 of the housing. The push rod 413 passes through the end plate 412 of the housing. The first end of the push rod 413 abuts against the adjusting assembly, and the second end of the push rod 413 protrudes outside the end plate 412 and is provided with a fixing member 414 thereon to control the length of the push rod 413 extending into the inside of the end plate 412. In this embodiment, the fixing member 414 and the push rod 413 are respectively a nut and a screw ( Figure 3 and Figure 4 ), and the quantity is 3 for each.

[0122] The number of both the first friction ring 42 and the second friction ring 43 is greater than one. By adjusting the arrangement of the first friction ring 42 and the second friction ring 43, the friction area is changed, thus adjusting the transmission effect of the housing to the hollow shaft 47. In this embodiment, the number of first friction rings 42 is four and the number of second friction rings 43 is three, but the number of these two is not limited to these in this invention.

[0123] When it is necessary to increase the frictional area between the first friction ring 42 and the second friction ring 43, the first friction ring 42 and the second friction ring 43 are arranged alternately. When it is necessary to appropriately reduce the frictional area between the first friction ring 42 and the second friction ring 43, the first friction ring 42 and the second friction ring 43 are arranged partially alternately. When it is necessary to minimize the frictional area between the first friction ring 42 and the second friction ring 43 to the maximum extent and the frictional area is not zero, the first friction ring 42 and the second friction ring 43 are arranged in two pairs, so that the frictional area is only the area of ​​one first friction ring 42 in contact with one second friction ring 43. In most cases of this embodiment, the first friction ring 42 and the second friction ring 43 are arranged alternately, such as... Figure 4 As shown.

[0124] There are two length-limiting positioning components, symmetrically arranged; there are two tensioning devices, symmetrically arranged. Further, there are two positioning rollers 7, symmetrically arranged; two transmission wheel assemblies 5, symmetrically arranged; two transmission components 9, symmetrically arranged; two synchronization device assemblies 4, symmetrically arranged; and two side rails 6, symmetrically arranged. In this embodiment, the radius (r) of the curtain material 3 on the roller 2... 帘料 The radius (r) of the transmission component 9 on the transmission wheel 51 is less than or equal to that of the transmission component 9. 传动件 This should be understood as r being the amount of material 3 rolled up onto the roller 2. 帘料 The maximum value does not exceed r 传动件 The transmission wheel assembly 5 slips only when rotating in the winding direction. When rotating in the unwinding direction, the pawl 52 engages with the ratchet teeth 511, driving the ratchet gear to rotate. In this embodiment, since the ratchet teeth 511 are arranged counterclockwise around the inner circumference of the transmission wheel 51 in the right view of the ratchet gear, and each ratchet tooth has the same inclination angle, the unwinding direction in this embodiment is counterclockwise in the right view of the ratchet gear, and the winding direction is clockwise in the right view of the ratchet gear. In other embodiments, the unwinding and winding directions are not limited to those described in Embodiment 1.

[0125] The unrolling process of a roller blind with a tensioning device:

[0126] The power source drives the roller to rotate, causing the curtain material wound on the roller to unwind. The length of the unwound curtain material (L) 放 ) equals the spool rotation speed (v) 卷轴 Multiply by time (t) and by the radius (r) of the cord on the 2π reel. 帘料 (i.e., Formula 1). Note: The rotational speed in this invention refers to the number of revolutions per unit time, so it needs to be multiplied by the circumference of each revolution.

[0127] L 放 = v 卷轴 ×t×2πr 帘料 Formula 1

[0128] Simultaneously, the roller drives the outer casing, which in turn drives the first friction ring. The first friction ring, due to friction, drives the second friction ring, which in turn drives the hollow shaft. The hollow shaft drives the pawl support shaft, which in turn drives the pawl. The pawl drives the transmission wheel (in this embodiment, the transmission wheel is a ratchet gear), which in turn drives the transmission component. The transmission component then drives the bottom rail to pull out the curtain material, the length of which is (L') of the pulled-out curtain material. 放 ) equals the rotational speed of the transmission wheel (v) 传动轮 Multiply by time (t) by 2π the radius (r) of the transmission component on the transmission wheel. 传动件 ), which is Formula 2.

[0129] L' 放 = v 传动轮×t×2πr 传动件 Formula 2

[0130] In formulas 1 and 2, t is always synchronized and the same. When there is no slippage in the friction assembly, v 传动轮 equals v 卷轴 If r 传动件 equals r 帘料 Then L 放 equal to L' 放 As the unwinding time progresses, the radius of the cord material on the reel will decrease, i.e., r 帘料 It is a variable that makes L' 放 tending to not equal L 放 This creates tension on the curtain material, keeping it taut, preventing sagging, and maintaining its flatness. Assuming that at the start of unwinding, r... 帘料 equals r 传动件 Then L 放 equal to L' 放 As the unwinding time progresses... 帘料 Gradually decreasing, making L 放 Less than L' 放 This results in the curtain material being continuously taut, meaning the curtain material is being continuously stretched. When r 帘料 Less than r 传动件 When the tension of the bottom rail on the curtain material is greater than the friction between the first and second friction rings, slippage occurs between the first and second friction rings, causing v to... 传动轮 Less than v 卷轴 So that L can continue to be maintained 放 equal to L' 放 .

[0131] The winding process of a roller blind with a tensioning device:

[0132] The power source drives the roller to rotate, causing the curtain material wound on the roller to be rolled up, and the length of the rolled-up curtain material (L) 收 ) equals the spool rotation speed (v' 卷轴 Multiply by time (t') and by the radius of the cord on the 2π reel (r) 帘料 ), which is Formula 3.

[0133] L 收 = v' 卷轴 ×t'×2πr 帘料 Formula 3

[0134] Simultaneously, the spool drives the outer casing, which in turn drives the first friction ring. The first friction ring, due to friction, drives the second friction ring, which in turn drives the hollow shaft. The hollow shaft drives the pawl support shaft, which in turn drives the pawl. When the pawl is not slipping, the pawl drives the transmission wheel, which in turn drives the transmission component. The transmission component then drives the bottom rail to wind up the curtain material, and the length of the wound curtain material (L') is...收 ) equals the rotational speed of the transmission wheel (v') 传动轮 Multiply by time (t') and by the radius (r) of the transmission component on the transmission wheel (2π). 传动件 ), which is Formula 4.

[0135] L' 收 = v' 传动轮 ×t'×2πr 传动件 Formula 4

[0136] In formulas 3 and 4, t' is always synchronized and the same. This is because the radius (r) of the curtain material on the roller in this embodiment... 帘料 The radius (r) of the transmission component on the transmission wheel is less than or equal to that of the transmission wheel. 传动件 When the curtain material is wound onto the roller, r 帘料 The maximum value does not exceed r 传动件 Therefore, at the beginning of the winding process, r 帘料 It must be less than r 传动件 Therefore, according to formulas 3 and 4, L' 收 tending to be greater than L 收 This will inevitably cause the fabric to wrinkle. However, due to the design of the drive wheel assembly, winding will cause the pawl to slip, thus causing v' 传动轮 Less than v' 卷轴 To continue to maintain L' 收 equal to L 收 Or, the pawl may slip, rendering it completely unable to drive the drive wheel. In this case, only the bottom rail pulls the transmission component, which in turn drives the drive wheel to maintain L'. 收 equal to L 收 .

[0137] Example 2

[0138] In this embodiment, in the right view of the ratchet, the ratchet teeth are arranged clockwise around the inner circumference of the ratchet. The rest of the structure is the same as in Embodiment 1. The unwinding and rewinding processes are similar to those in Embodiment 1, only the unwinding and rewinding directions are different.

[0139] Example 3

[0140] In this embodiment, the tilt angle of some ratchet teeth is different. The rest is the same as in Embodiment 1.

[0141] Example 4

[0142] In this embodiment, the roller blind with a tensioning device does not include a synchronization device assembly. The synchronization device assembly functions by utilizing the coaxial rotation of the transmission component and the ratchet gear to achieve frictional slippage. Specifically, the power source transmits power to the roller, which unwinds or winds the curtain material. Simultaneously, the rotation of the roller drives the pawl support shaft to rotate, which in turn drives the pawl and ratchet gear to rotate. The ratchet gear drives the transmission component on it to unwind or wind up the curtain material connected to the bottom rail. In this comparative example, to synchronize the speed of the roller's unwinding and winding of the curtain material with the speed of the side rail's unwinding and winding of the curtain material, frictional slippage occurs between the transmission component and the ratchet gear, achieving the synchronization function of the synchronization device assembly in Embodiment 1. However, this embodiment is inferior to Embodiment 1 in that the friction between the transmission component and the ratchet gear generates high temperatures. The large amount of heat causes the transmission component to soften, thus accelerating its wear. Therefore, while slippage of the transmission component does not prevent tensioning, it does make the transmission component more prone to wear and shorten its service life. The purpose of using a single synchronization device assembly in Example 1 is to extend the service life of the roller blind with a tensioning device by utilizing the wear resistance of the friction components (such as the first friction ring, the second friction ring, the first pressure element, and / or the second pressure element, all of which are made of brake pads), which is from the perspective of product lifespan. The rest of the structure is the same as in Example 1.

[0143] The unrolling process of a roller blind with a tensioning device:

[0144] The reel drives the pawl support shaft. When r 帘料 Less than r 传动件 When the tension on the curtain material by the bottom rail is greater than the friction between the transmission component and the ratchet, slippage occurs between the transmission component and the ratchet, causing v 棘齿轮 Less than v 卷轴 So that L can continue to be maintained 放 equal to L' 放 The remaining unwinding process is the same as in Example 1.

[0145] The winding process of a roller blind with a tensioning device:

[0146] The spool drives the pawl support shaft. The bottom rail pulls the transmission component. Although slippage may occur between the transmission component and the ratchet, the movement of the transmission component can still be maintained at L'. 收 equal to L 收 The remaining winding process is the same as in Example 1.

[0147] Example 5

[0148] In this embodiment, the adjusting assembly includes a first pressure-applying element, an electromagnetic relay, and a second pressure-applying element. The adjusting assembly adjusts the distance between the first and second pressure-applying elements via the electromagnetic relay to change the pressure applied to the friction assembly, thereby adjusting the frictional force between the first and second friction rings. The distance between the first and second pressure-applying elements changes with the electromagnetic field generated by the electromagnetic relay. The rest is the same as in Embodiment 1.

[0149] Example 6

[0150] In this embodiment, the fastener is a perforated pin structure. The distance between the first and second pressure-applying components is adjusted according to the distance between the holes in the rod inserted between the first and second pressure-applying components, thereby changing the pressure applied to the friction component by the adjusting component, and thus adjusting the frictional force between the first and second friction rings. The rest is the same as in Embodiment 1.

[0151] Example 7

[0152] In this embodiment, the first linkage component is an inwardly recessed recess, and a corresponding protrusion matching the first linkage component is provided on the inner wall of the outer shell; the second linkage component is an inwardly extending protrusion, and a corresponding recess matching the second linkage component is provided on the outer contour of the hollow shaft. The rest is the same as in Embodiment 1.

[0153] Example 8

[0154] In this embodiment, the first linkage component includes both an outwardly extending protrusion and an inwardly recessed recess. The inner wall of the outer casing has a recess at the corresponding position of the outwardly extending protrusion that matches the outwardly extending protrusion, and the inner wall of the outer casing has a protrusion at the corresponding position of the inwardly recessed recess that matches the inwardly recessed recess. The rest is the same as in Embodiment 1.

[0155] Example 9

[0156] In this embodiment, the inner wall profile of the outer casing is not circular, and the outer profile of the first friction ring matches the inner wall profile of the outer casing, allowing the first friction ring to rotate with the outer casing. The first linkage component is a portion of the outer profile of the first friction ring that matches the inner wall profile of the outer casing. The second linkage component includes both an inwardly extending protrusion and a recessed recess. The outer profile of the hollow shaft has a recess matching the inwardly extending protrusion at the corresponding position of the inwardly extending protrusion, and a protrusion matching the inwardly recessed recess at the corresponding position of the inwardly recessed recess. The rest is the same as in Embodiment 1.

[0157] Example 10

[0158] In this embodiment ( Figure 11The transmission wheel assembly does not include a pawl and a pawl support shaft, but includes a gear shifting assembly. The gear shifting assembly includes an n-gear set, sequentially numbered from the 1st gear set to the nth gear set, where n > 1. The transmission wheel assembly is configured such that the hollow shaft 47 is connected to the gear set, and the gear set is connected to the transmission wheel 5. The rotational speed of the hollow shaft 47 changes after passing through different gear sets. The transmission wheel 5 is annular, with an n-row gear track 61 on its inner ring that matches the n-gear set. The gear set includes at least two gears connected by transmission: a driving gear 62 and a driven gear 63. The driving gear 62 is connected to the hollow shaft 47, and the driven gear 63 is mounted on the gear track 61. The diameters of the n-row gear tracks are different, and / or the diameters of the driving gears in the n-gear set are different. In this embodiment, n = 2. The remaining structure is the same as in Embodiment 1.

[0159] The unrolling process of a roller blind with a tensioning device:

[0160] The power source drives the roller to rotate, causing the curtain material wound on the roller to unwind. The length of the unwound curtain material (L) 放 ) equals the spool rotation speed (v) 卷轴 Multiply by time (t) and by the radius (r) of the cord on the 2π reel. 帘料 ), that is, Formula 1.

[0161] L 放 = v 卷轴 ×t×2πr 帘料 Formula 1

[0162] Simultaneously, the roller drives the outer casing, which in turn drives the first friction ring. The first friction ring, due to friction, drives the second friction ring, which in turn drives the hollow shaft. The hollow shaft drives the gear set, which in turn drives the transmission wheel. The transmission wheel drives the transmission component, which in turn drives the bottom rail to pull out the curtain material. The length of the pulled-out curtain material (L') 放 ) equals the rotational speed of the transmission wheel (v) 传动轮 Multiply by time (t) by 2π the radius (r) of the transmission component on the transmission wheel. 传动件 ), which is Formula 2.

[0163] L' 放 = v 传动轮 ×t×2πr 传动件 Formula 2

[0164] In formulas 1 and 2, t is always synchronized and the same. When there is no slippage in the friction assembly, v 传动轮 equals v 卷轴 If r 传动件 equals r 帘料 Then L 放 equal to L' 放As the unwinding time progresses, the radius of the cord material on the reel will decrease, i.e., r 帘料 It is a variable that makes L' 放 tending to not equal L 放 This creates tension on the curtain material, keeping it taut, preventing sagging, and maintaining its flatness. Assuming that at the start of unwinding, r... 帘料 equals r 传动件 Then L 放 equal to L' 放 As the unwinding time progresses... 帘料 Gradually decreasing, making L 放 Less than L' 放 This results in the curtain material being continuously taut, meaning the curtain material is being continuously stretched. When r 帘料 Less than r 传动件 When the tension of the bottom rail on the curtain material is greater than the friction between the first and second friction rings, slippage occurs between the first and second friction rings, causing v to... 传动轮 Less than v 卷轴 So that L can continue to be maintained 放 equal to L' 放 .

[0165] The winding process of a roller blind with a tensioning device:

[0166] The power source drives the roller to rotate, causing the curtain material wound on the roller to be rolled up, and the length of the rolled-up curtain material (L) 收 ) equals the spool rotation speed (v' 卷轴 Multiply by time (t') and by the radius of the cord on the 2π reel (r) 帘料 ), which is Formula 3.

[0167] L 收 = v' 卷轴 ×t'×2πr 帘料 Formula 3

[0168] Simultaneously, the roller drives the outer casing, which in turn drives the first friction ring. The first friction ring, due to friction, drives the second friction ring, which in turn drives the hollow shaft. The hollow shaft drives the gear set, which in turn drives the transmission wheel. The transmission wheel drives the transmission component, which in turn drives the bottom rail to wind up the curtain material. The length of the curtain material wound up (L') 收 ) equals the rotational speed of the transmission wheel (v') 传动轮 Multiply by time (t') and by the radius (r) of the transmission component on the transmission wheel (2π). 传动件 ), which is Formula 4.

[0169] L' 收 = v' 传动轮 ×t'×2πr 传动件 Formula 4

[0170] In formulas 3 and 4, t' is always synchronized and the same. This is because the radius (r) of the curtain material on the roller in this embodiment... 帘料 The radius (r) of the transmission component on the transmission wheel is less than or equal to that of the transmission wheel. 传动件 When the curtain material is wound onto the roller, r 帘料 The maximum value does not exceed r 传动件 Therefore, at the beginning of the winding process, r 帘料 It must be less than r 传动件 Therefore, according to formulas 3 and 4, L' 收 tending to be greater than L 收 This will inevitably cause the curtain material to wrinkle. However, due to the setting of the n-gear set and the n-row gear tracks on the inner ring of the transmission wheel, the operator can adjust different gears according to different speeds to obtain a suitable v'. 传动轮 , so that v' 棘齿轮 Less than v' 卷轴 To continue to maintain L' 收 equal to L 收 .

[0171] Example 11

[0172] like Figure 12 and Figure 13 As shown, in this embodiment, the transmission component 9 is a transmission chain; the outer periphery of the transmission wheel and the positioning roller 7 has teeth that match the transmission chain, ensuring that there is no slippage between the transmission chain and the transmission wheel, and between the transmission chain and the positioning roller 7. The transmission wheel assembly does not include the pawl and the pawl support shaft, but the number of transmission wheels is m, namely the first gear transmission wheel... the mth gear transmission wheel, where m > 1. The radius of the first gear transmission wheel is the largest, the radius of the second gear transmission wheel is the second largest, and so on, with the radius decreasing sequentially, and the radius of the mth gear transmission wheel being the smallest. In this embodiment, m equals 2, that is, the transmission wheel includes the first gear transmission wheel 511 and the second gear transmission wheel 512. The hollow shaft 47 is connected to the transmission wheel, and the transmission component 9 is connected between transmission wheels of different radii through the mountain bike shifting method.

[0173] During winding, the shifting mechanism (i.e., the mountain bike shifting mechanism) switches to the (small radius) drive wheel (second drive wheel 512), thus achieving a curtain material radius larger than the drive wheel radius, ensuring the curtain material is tensioned during winding of the roller blind equipped with a tensioning device. During unwinding, the shifting mechanism switches to the (large radius) drive wheel (first drive wheel 511), thus achieving a curtain material radius smaller than the drive component radius, ensuring the curtain material is tensioned during unwinding of the roller blind equipped with a tensioning device. The rest is the same as in Embodiment 1. For example, both ends of the bottom rail 8 are connected to the drive component 9, allowing the bottom rail 8 to move with the drive component 9. The installation positions of the power source 1 and the synchronization device assembly 4 are the same as in Embodiment 1.

[0174] Example 12

[0175] In this embodiment, the transmission component is a transmission chain, and the ratchet is a ratchet sprocket that can cooperate with the transmission chain for transmission. The outer contour of the ratchet sprocket is provided with protruding teeth that can engage with the gaps between the transmission chains, thereby ensuring that the transmission chain and the ratchet sprocket are synchronously transmitted without slippage. The rest is the same as in Embodiment 1.

[0176] Example 13

[0177] In this embodiment, the transmission component is a transmission belt, and the transmission pulley is a transmission belt pulley that can cooperate with the transmission belt for transmission. The rest is the same as in Embodiment 1 or 10.

[0178] Example 14

[0179] In this embodiment, the transmission component is a transmission steel wire, and the transmission wheel is a transmission steel wire wheel that can cooperate with the transmission steel wire for transmission. The rest is the same as in Embodiment 1 or 10.

[0180] Example 15

[0181] In this embodiment ( Figure 14 and Figure 15 The power source 1 is located on the axis of the positioning roller 7, which drives the positioning roller 7 to rotate, thereby driving the transmission component 9. The transmission component 9 then drives the transmission wheel assembly to rotate. The transmission wheel assembly then drives the friction component to rotate via the hollow shaft 47. The friction component drives the outer shell to rotate. The outer shell drives the roller 2 to rotate, thereby realizing the unwinding and / or winding of the curtain material 3. The inner ring contour of the second friction ring is provided with a second linkage component that matches the outer contour of the hollow shaft 47, so that the second friction ring can rotate with the shaft. The outer ring contour of the first friction ring is provided with a first linkage component that matches the inner wall of the outer shell, so that the outer shell can rotate with the first friction ring. The rest is the same as in Embodiment 1.

[0182] Example 16

[0183] In this embodiment ( Figure 16 This version does not contain a synchronization device assembly; the synchronization effect is achieved through sliding friction between the transmission wheel 51 and the transmission component 9. It also does not contain the pawl and pawl support shaft found in the transmission wheel assembly. Otherwise, it is the same as in Embodiment 1.

[0184] Example 17

[0185] In this embodiment, the outer casing is connected to the power source via a transmission connection; the rotating shaft and the power source are arranged on the same axis. Auxiliary wheels are provided at both ends of the roller; a transmission component also surrounds the auxiliary wheels. The power source transmits power to the friction assembly through the outer casing, then to the rotating shaft, which drives the transmission wheel assembly, thereby driving the auxiliary wheels to rotate through the transmission component, and ultimately rotating the roller to achieve the unwinding and / or winding of the curtain material. The remaining structure is the same as in Embodiment 1 or Embodiment 10.

[0186] Example 18

[0187] In this embodiment ( Figure 17 and Figure 18 The hollow shaft 47 is connected to the power source 1 via a transmission; the hollow shaft 47 and the power source 1 are arranged on the same axis. Auxiliary wheels 71 are provided at both ends of the roller 2; the transmission component 9 also surrounds the auxiliary wheels 71. The power source 1 transmits power to the friction assembly via the hollow shaft 47, and then to the housing 41. The housing 41 drives the transmission wheel assembly 5, which in turn drives the auxiliary wheels 71 to rotate via the transmission component 9, thereby driving the roller 2 to rotate and realize the unwinding and / or winding of the curtain material 3. The remaining structure is the same as in Embodiment 1.

[0188] Example 19

[0189] In this embodiment ( Figure 19 and Figure 20 The rotating shaft (not limited to a hollow shaft 47, but can also be a solid shaft) is connected to the roller 2 for transmission; the rotating shaft and the roller 2 are arranged on the same axis. Auxiliary wheels 71 are provided at both ends of the power source 1; the transmission component 9 also surrounds the auxiliary wheels 71; the power source 1 drives the transmission component 9 through the auxiliary wheels 71, which in turn drives the transmission wheel assembly 5, which in turn drives the friction component through the housing 41 to rotate the rotating shaft, thereby driving the roller 2 to rotate and realize the unwinding and / or winding of the curtain material 3. The remaining structure is the same as in Embodiment 1 or Embodiment 10. In this invention, unless the technical effect requires a hollow shaft, there is no limitation on whether the rotating shaft is hollow. For example, in an embodiment where the power source's wire passes through the rotating shaft, the rotating shaft must be a hollow shaft. If no such technical effect needs to be achieved, then it is not necessary to limit the rotating shaft to a hollow shaft.

[0190] Example 20

[0191] In this embodiment, the outer casing is connected to the roller via a drive mechanism; the rotating shaft and the roller are arranged on the same axis. Auxiliary wheels are provided at both ends of the power source; a transmission component also surrounds the auxiliary wheels; the power source drives the transmission component via the auxiliary wheels, which in turn drives the transmission wheel assembly. The transmission wheel assembly then drives the friction component via the rotating shaft, causing the outer casing to rotate, thereby rotating the roller to achieve the unwinding and / or winding of the curtain material. The remaining structure is the same as in Embodiment 1 or Embodiment 10.

[0192] The preferred embodiments of the present invention have been described in detail above, but not all embodiments are exhaustive. It should be understood that those skilled in the art can make many modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of the prior art should be within the scope of protection defined by the claims.

Claims

1. A roller shade having a tensioning device, characterized in that The power source, the reel, the curtain material, the length limiting positioning member and the tensioning device; the length limiting positioning member is used for limiting the unwinding length of the curtain material, and includes a positioning roller; the tensioning device includes a transmission member and a transmission wheel assembly; the transmission wheel assembly includes a transmission wheel, a pawl and a pawl support shaft; the transmission member is annular, and surrounds the transmission wheel and the positioning roller; The power source is in transmission connection with the reel, the reel is connected with the transmission member through the transmission wheel assembly, so that the transmission member can rotate with the reel; the reel is also connected with the transmission member through the curtain material; The tensioning device further includes a synchronous device assembly; the synchronous device assembly includes a housing, a friction assembly and a rotating shaft; the housing of the synchronous device assembly is in transmission connection with the reel; the rotating shaft of the synchronous device assembly is in transmission connection with the transmission member through the transmission wheel assembly; The friction assembly includes a first friction ring and a second friction ring; the rotating shaft passes through the first friction ring and the second friction ring; the inner ring profile of the second friction ring is provided with a second linkage component matched with the outer profile of the rotating shaft, so that the second friction ring rotates synchronously with the rotating shaft; the first friction ring is close to the second friction ring, and the first friction ring is driven to rotate in the same direction with the second friction ring through the friction force between the first friction ring and the second friction ring; the outer ring profile of the first friction ring is provided with a first linkage component matched with the inner wall of the housing, so that the housing rotates synchronously with the first friction ring; The transmission wheel is a ratchet wheel; the ratchet teeth of the ratchet wheel are arranged on the inner circumferential surface of the ratchet wheel in the same direction; the front end of the pawl is arranged in the ratchet teeth of the ratchet wheel, and the root of the pawl is arranged on the outer circumferential surface of the pawl support shaft; the transmission wheel assembly is arranged as follows: when the rotating direction of the pawl support shaft is the same as the inclination direction of the ratchet teeth of the ratchet wheel, the pawl is engaged in the ratchet teeth of the ratchet wheel, and the ratchet wheel is driven to rotate synchronously with the pawl support shaft in the same direction; when the rotating direction of the pawl support shaft is opposite to the inclination direction of the ratchet teeth of the ratchet wheel, the pawl slips in the ratchet teeth of the ratchet wheel, and the ratchet wheel is not driven to rotate synchronously with the pawl support shaft; the transmission wheel assembly only slips when rotating in the winding direction, and the pawl and the ratchet teeth of the ratchet wheel are in meshing state to drive the ratchet wheel to rotate when rotating in the unwinding direction; the pawl support shaft is in transmission connection with the rotating shaft.

2. The roller shade with a tensioning device according to claim 1, characterized in that The housing is integrally formed with the reel.

3. The roller shade with a tensioning device according to claim 1, wherein, The synchronous device assembly further includes an adjusting assembly; the adjusting assembly adjusts the friction force between the first friction ring and the second friction ring by applying pressure to the friction assembly.

4. The roller shade with a tensioning device according to claim 3, characterized in that The adjusting assembly includes an elastic member; the elastic member controls the pressure applied to the friction assembly by the degree of elastic deformation, so as to adjust the friction force between the first friction ring and the second friction ring.

5. The roller shade with a tensioning device according to claim 4, characterized in that The adjusting assembly further includes a first pressure applying member; the elastic member transmits the pressure generated by the elastic deformation to the friction assembly through the first pressure applying member.

6. The roller shade with a tensioning device according to claim 5, characterized in that The first pressure applying member has the same outer profile as the first friction ring, so that the first pressure applying member can rotate with the shell.

7. The roller shade with a tensioning device according to claim 5, wherein, The first pressure applying member is annular; the inner annular profile of the first pressure applying member is the same as the inner annular profile of the second friction ring, so that the rotating shaft can rotate with the first pressure applying member.

8. The roller shade with a tensioning device according to claim 5, wherein, The adjusting assembly further comprises a second pressure applying member; the first pressure applying member, the elastic member and the second pressure applying member are arranged in sequence.

9. The roller shade with a tensioning device according to claim 8, characterized in that The first pressure applying member and the second pressure applying member are annular. The outer profile of the first pressure applying member and the outer profile of the second pressure applying member are both the same as the outer profile of the first friction ring, so that the first pressure applying member and the second pressure applying member can both rotate with the shell; or The inner profile of the first pressure applying member and the inner profile of the second pressure applying member are both the same as the inner profile of the second friction ring, so that the rotating shaft can rotate with the first pressure applying member and the second pressure applying member.

10. The roller shade with a tensioning device according to claim 4, wherein, The elastic deformation degree of the elastic member is adjusted by the fastener; the fastener comprises a jack; the extension and retraction degree of the jack can change the elastic deformation force on the elastic member, so as to adjust the elastic deformation degree of the elastic member.

11. The roller shade with a tensioning device according to claim 10, wherein, The adjusting assembly further comprises a first pressure applying member and a second pressure applying member; the first pressure applying member, the elastic member and the second pressure applying member are arranged in sequence; the fastener is arranged on the first pressure applying member and / or the second pressure applying member.

12. The roller shade with a tensioning device according to claim 10, wherein, The adjusting assembly and the friction assembly are arranged in the space enclosed by the side wall of the shell and the end plate of the shell; the first end of the jack abuts against the adjusting assembly, and the second end of the jack is exposed outside the end plate and is provided with a fixing member to control the length of the jack extending into the inside of the end plate.

13. The roller shade with a tensioning device according to claim 1, wherein, The first linkage component is a protrusion extending outward, and the inner wall of the shell is provided with a recess matching the first linkage component at the corresponding position; or the first linkage component is a recess recessed inward, and the inner wall of the shell is provided with a protrusion matching the first linkage component at the corresponding position; or the first linkage component comprises both a protrusion extending outward and a recess recessed inward, and the inner wall of the shell is provided with a recess matching the protrusion extending outward at the corresponding position of the protrusion extending outward, and is provided with a protrusion matching the recess recessed inward at the corresponding position of the recess recessed inward.

14. The roller shade with a tensioning device according to claim 1, wherein, The cross-sectional inner wall profile of the shell is not circular, and the outer profile of the first friction ring matches the cross-sectional inner wall profile of the shell, so that the first friction ring can rotate with the shell; the first linkage component is part of the outer profile of the first friction ring, which makes the outer annular profile of the first friction ring match the cross-sectional inner wall profile of the shell.

15. The roller shade with a tensioning device according to claim 1, wherein, The second linkage component is a protrusion extending inwardly, and the outer profile of the rotating shaft is provided with a recess matching the second linkage component at the corresponding position; or the second linkage component is a recess recessed inwardly, and the outer profile of the rotating shaft is provided with a protrusion matching the second linkage component at the corresponding position; or the second linkage component includes both the protrusion extending inwardly and the recess recessed inwardly, and the outer profile of the rotating shaft is provided with a recess matching the protrusion extending inwardly at the corresponding position of the protrusion extending inwardly, and the outer profile of the rotating shaft is provided with a protrusion matching the recess recessed inwardly at the corresponding position of the recess recessed inwardly.

16. The roller shade with a tensioning device according to claim 1, wherein, The cross-sectional outer profile of the rotating shaft is not circular, and the inner profile of the second friction ring matches the cross-sectional outer profile of the rotating shaft, so that the rotating shaft can rotate with the second friction ring; the second linkage component is part of the inner profile of the second friction ring, so that the inner ring profile of the second friction ring matches the cross-sectional outer profile of the rotating shaft.

17. The roller shade with a tensioning device according to claim 1, wherein, The number of the first friction ring or the second friction ring is greater than 1, and the transmission effect of the shell to the rotating shaft is adjusted by adjusting the arrangement of the first friction ring and the second friction ring to change the friction area.

18. The roller shade with a tensioning device according to any of claims 1-17, wherein, The power source is arranged in the reel; and the power cord of the power source passes through the rotating shaft for connecting with the power socket.

19. The roller shade with a tensioning device according to any of claims 1-17, wherein, Both ends of the power source are provided with auxiliary wheels; the transmission member also surrounds the auxiliary wheels; the power source drives the transmission member through the auxiliary wheels, the transmission member drives the transmission wheel assembly, and the transmission wheel assembly drives the reel through the synchronization device assembly to realize the unwinding and / or winding of the curtain material.

20. The roller shade with a tensioning device according to any of claims 1-17, wherein, The power source is arranged on the axis where the positioning roller is located, drives the transmission member by driving the positioning roller to rotate, drives the transmission wheel assembly by the transmission member, and drives the reel to rotate through the synchronization device assembly to realize the unwinding and / or winding of the curtain material.

21. The roller shade with a tensioning device according to any of claims 1-17, wherein, The radius of the curtain material roll on the reel is not greater than the radius of the transmission member on the transmission wheel.

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