Roller shutter

Abstract

The utility model discloses a roller shutter which comprises a rolling shaft and a shutter material wound on the rolling shaft, the fixed end of the shutter material is arranged on the rolling shaft, the free end of the shutter material is provided with a bottom rail, one end of the rolling shaft is connected with a synchronous assembly, the synchronous assembly rotates along with the rolling shaft, the synchronous assembly is sleeved with a one-way belt wheel assembly, and a transmission belt is wound on the surface of the one-way belt wheel assembly. And the bottom rail is connected with the transmission belt, so that in the rolling or unrolling movement process of the curtain material, the reel is driven by the power source to rotate and drives the synchronous assembly and the one-way belt wheel assembly to rotate, the one-way belt wheel assembly drives the transmission belt to translate, and the transmission belt drives the free end of the curtain material and the bottom rail to translate synchronously. In the winding and unwinding process, the curtain material can be kept tensioned, flat and free of drooping, the problem that the synchronous assembly with the tensioning function is arranged in the winding shaft and is inconvenient to maintain is solved, maintenance is convenient, materials are saved, and the tensioning degree is convenient to adjust.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of roller shutter, relates to a roller shutter. BACKGROUND

[0002] With the change of people's life concept, the demand for sunshade products is also increasing, and the electric ceiling curtain is one of the widely used products. The ceiling curtain in the market is mostly installed horizontally. Since it cannot be closed by gravity, most of them are realized by the extension belt structure on both sides to realize the unwinding of the roller shutter. The extension belt is in a stressed state for a long time when the curtain is unwound, which is easy to fatigue and seriously affects the service life of the ceiling curtain. In addition, there are two kinds of ceiling curtain products with tension spring and gas spring scheme on the market. The characteristics are that the tension spring and the gas spring are installed in the traction rod, and the length of the tension spring and the gas spring is limited by the length of the traction rod. Therefore, the compensation distance cannot exceed the length of the traction rod, and the spring fatigue problem still exists.

[0003] Patent document CN202310649301.6 discloses a roller shutter with a tensioning device, which is provided with a synchronous device assembly in the tensioning mechanism in the winding pipe of the roller shutter. The synchronous device assembly is used to realize the tensioning effect. However, the structure design of the built-in tensioning mechanism of the roller shutter makes the diameter of the winding pipe must be greater than the maximum outer diameter of the tensioning mechanism, otherwise the tensioning mechanism cannot be installed in the winding pipe, thereby causing the diameter of the winding pipe to be relatively thick. This structure not only causes waste of materials and is not economical, but also is not aesthetically pleasing, especially for sunshade curtains with short curtain cloth. Due to the limitation of installation scene and position, the sunshade curtain with thick winding pipe cannot be installed, which limits the application scene of the sunshade curtain. Moreover, the tensioning mechanism is arranged in the winding pipe. Once a failure or serious wear occurs, the tensioning mechanism cannot be quickly lubricated or repaired. UTILITY MODEL CONTENTS

[0004] In order to solve the problems of curtain material sagging, unevenness, not tensioning and inconvenient maintenance after the roller shutter is unwound and during the unwinding process, the utility model discloses a roller shutter, which comprises a winding shaft, curtain material wound on the winding shaft, a fixed end of the curtain material arranged on the winding shaft, a free end of the curtain material provided with a bottom rail, one end of the winding shaft connected with a synchronous assembly, the synchronous assembly rotating with the winding shaft, the synchronous assembly sleeved with a one-way pulley assembly, the surface of the one-way pulley assembly surrounded by a transmission belt, the bottom rail connected with the transmission belt, so that during the winding or unwinding movement of the curtain material, the winding shaft is driven to rotate by a power source, and the synchronous assembly and the one-way pulley assembly are rotated, the one-way pulley assembly drives the transmission belt to translate, and the transmission belt drives the free end of the curtain material and the bottom rail to translate synchronously.

[0005] Preferably, the synchronous assembly comprises a stepped shaft and a friction assembly, the stepped shaft comprises a shaft body, a shaft shoulder and a shaft head;

[0006] The surface of the shaft body is matched with the surface of the reel, so that the shaft body is connected with the inside of the reel, the surface of the shaft shoulder is provided with threads, so that the friction assembly is sleeved on the shaft shoulder, and the shaft head is inserted into the one-way pulley assembly.

[0007] Preferably, the outer shape of the shaft head is D-shaped.

[0008] Preferably, the friction assembly comprises a first compression screw, a friction ring and a spring, the first compression screw, the friction ring and the spring are sleeved on the threads of the shaft shoulder in sequence.

[0009] Preferably, the friction assembly further comprises a friction washer, one side of the friction washer is connected with the spring, and the friction washer rotates in the same direction with the shaft head, so that the other side of the friction washer is matched with the one-way pulley assembly after the shaft head is inserted into the one-way pulley assembly.

[0010] Preferably, the end of the surface of the shaft head is provided with threads, so that the end of the shaft head is fastened with a second compression screw after the shaft head is inserted into the one-way pulley assembly.

[0011] Preferably, the one-way pulley assembly comprises a ratchet pulley, a pawl and a pawl support shaft, the inner ring of the ratchet pulley is a ratchet gear, the ratchet teeth of the ratchet gear are arranged on the inner side circumferential surface of the ratchet gear and inclined to the same rotation direction, the front end of the pawl is arranged in the ratchet teeth of the ratchet gear, the root of the pawl is arranged on the outer side circumferential surface of the pawl support shaft, the ratchet pulley surrounds the transmission belt, and the pawl support shaft is in transmission connection with the synchronous assembly.

[0012] When the rotation direction of the pawl support shaft is the same as the inclination direction of the ratchet teeth of the ratchet gear, the pawl is engaged in the ratchet teeth of the ratchet gear, so as to push the ratchet gear and the pawl support shaft to rotate synchronously and in the same direction; when the rotation direction of the pawl support shaft is opposite to the inclination direction of the ratchet teeth of the ratchet gear, the pawl slips in the ratchet teeth of the ratchet gear, so that the ratchet gear does not rotate synchronously with the pawl support shaft.

[0013] Preferably, the one-way pulley assembly comprises a pulley, a clamping hoop, a ratchet pulley, a pawl and a pawl support shaft, the pulley surrounds the transmission belt, the pulley is sleeved on the clamping hoop, the clamping hoop is sleeved on the ratchet pulley, the inner ring of the ratchet pulley is a ratchet gear, the ratchet teeth of the ratchet gear are arranged on the inner side circumferential surface of the ratchet gear and are inclined to the same direction, the front end of the pawl is arranged in the ratchet tooth of the ratchet gear, and the root of the pawl is arranged on the outer side circumferential surface of the pawl support shaft, and the pawl support shaft is in driving connection with the synchronous assembly.

[0014] When the rotating direction of the pawl support shaft is the same as the inclination direction of the ratchet teeth of the ratchet gear, the pawl is engaged in the ratchet teeth of the ratchet gear, and the ratchet gear is driven to rotate synchronously with the pawl support shaft and 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 gear, the pawl slips in the ratchet teeth of the ratchet gear, and the ratchet gear is not driven to rotate synchronously with the pawl support shaft.

[0015] Preferably, the inner ring of the pulley is provided with a plurality of grooves or protrusions, the outer ring of the clamping hoop is provided with a plurality of protrusions or grooves, and the grooves and the protrusions are matched one by one after corresponding, so that the pulley is sleeved on the clamping hoop.

[0016] Preferably, the clamping hoop comprises an annular hoop body and at least one wing plate connected with the annular hoop body, each wing plate is provided with a bolt connection hole, the bolt connection hole is connected by a bolt to form a clamping force, so that the pulley, the clamping hoop and the ratchet pulley are synchronously clamped and moved.

[0017] The utility model discloses a beneficial effect:

[0018] 1. The roller shutter disclosed by the utility model connects the synchronous assembly rotating with the roller shaft at one end of the roller shaft, solves the problem that the synchronous assembly with the tensioning function in the prior art is arranged in the roller shaft and is inconvenient to maintain, is convenient to maintain, saves materials and is convenient to adjust the tensioning degree.

[0019] 2. The roller shutter disclosed by the utility model rotates synchronously through the synchronous assembly and the one-way pulley assembly, so that the curtain material of the roller shutter is kept in a tensioning state when being wound and unwound, the curtain material is prevented from sagging and being uneven, has good user experience and can be widely applied to various scenes where the roller shutter is installed on a top surface, an inclined surface, a vertical surface and needs to be inverted.

[0020] The concept, specific structure and generated technical effects of the utility model will be further described below with reference to the drawings, so that the purpose, characteristics and effects of the utility model can be fully understood. DRAWINGS

[0021] Figure 1 is the overall structure schematic diagram of the embodiment 1 of the utility model.

[0022] Figure 2 is the explosion schematic diagram of the embodiment 1 of the utility model.

[0023] Figure 3 is the explosion schematic diagram of the synchronous assembly and the one-way pulley assembly of the embodiment 1 of the utility model.

[0024] Figure 4 is the combination structure schematic diagram of the synchronous assembly and the one-way pulley assembly of the embodiment 1 of the utility model.

[0025] Figure 5 is the sectional view of the friction gasket in the embodiment 1 of the utility model.

[0026] Figure 6 is the partial sectional view of the one-way pulley assembly and the transmission belt after installation in the embodiment 1 of the utility model.

[0027] Figure 7 is the partial explosion drawing of the roller shutter in the embodiment 1 of the utility model.

[0028] Figure 8 is the overall structure schematic diagram of the embodiment 2 of the utility model.

[0029] Figure 9 is the explosion schematic diagram of the embodiment 2 of the utility model.

[0030] Figure 10 is the explosion schematic diagram of the synchronous assembly and the one-way pulley assembly of the embodiment 2 of the utility model.

[0031] Figure 11 is the combination structure schematic diagram of the synchronous assembly and the one-way pulley assembly of the embodiment 2 of the utility model.

[0032] Figure 12 is the sectional view of the embracing hoop in the embodiment 2 of the utility model.

[0033] Figure 13 is the partial sectional view of the one-way pulley assembly and the transmission belt after installation in the embodiment 2 of the utility model.

[0034] Figure 14 is the partial explosion drawing of the roller shutter in the embodiment 2 of the utility model. DETAILED DESCRIPTION

[0035] It is to be understood that the terminology used herein, the specific structure and function details disclosed are only for describing specific embodiments, and are representative, but the application can be embodied in many alternative forms, and should not be interpreted as being limited to the embodiments set forth herein.

[0036] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating relative importance, or implying the number of the indicated technical features. Therefore, unless otherwise specified, the features defined with "first", "second" can explicitly or implicitly include one or more of the features; the meaning of "several" is two or more. The term "includes" and any variation thereof means non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components and / or combinations thereof can exist or be added.

[0037] In addition, the terms indicating the orientation or positional relationship of "center", "transverse", "upper", "lower", "left", "right", "vertical", "horizontal", "top", etc. are described based on the orientation or relative position relationship shown in the drawings, only for the purpose of facilitating the simplified description of the utility model, and are not intended to indicate that the indicated device or element must have a specific orientation, and must have a specific orientation structure and operation, and therefore cannot be understood as a limitation on the utility model.

[0038] Furthermore, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0039] The roller shutter provided by the utility model is a sunshade curtain with external clutch and tensioning function, which can solve the problems of serious sagging, unevenness of curtain material after unrolling of the sunshade curtain, and limitation of the sunshade curtain beyond the compensation distance, and also transfers the clutch to the outside of the rolling pipe, has the advantages of saving materials and being convenient for maintenance and adjustment. The clutch of a general roller shutter is connected with the motor and is arranged in the rolling pipe together with the motor, and when the motor drives the roller shaft to rotate, the clutch plays a role of compensation distance in the roller shaft. The following two embodiments are introduced.

[0040] Embodiment 1

[0041] As shown in Figures 1 to 7 The roller shutter disclosed by the embodiment comprises a motor 1, a roller shaft 2, curtain material 3 wound on the roller shaft 2, and the motor 1 is arranged in the shaft of the roller shaft 2 as a power source and drives the roller shaft 2 to rotate. The fixed end of the curtain material 3 is arranged on the roller shaft 2, and the free end of the curtain material 3 is provided with a bottom rail 4. One end of the roller shaft 2 is connected with a synchronous assembly, and the synchronous assembly rotates with the roller shaft 2. As shown in Figure 2As shown, the other end of the reel 2 is connected with a synchronous assembly of the same structure, and the following description is made by taking the one end of the reel 2 as an example.

[0042] The synchronous assembly is sleeved with a one-way pulley assembly 8 in the axial direction, the outer surface of the one-way pulley assembly 8 is surrounded by a transmission belt 5, and the bottom rail 4 is connected with the transmission belt 5, so that during the winding or unwinding movement of the curtain material 3, the reel 2 is driven to rotate by a power source, and drives the synchronous assembly and the one-way pulley assembly 8 to rotate, the one-way pulley assembly 8 drives the transmission belt 5 to translate, and the transmission belt 5 drives the free end of the curtain material 3 and the bottom rail 4 to synchronously translate. The synchronous assembly functions as a roller shutter clutch, and during the winding and unwinding of the roller shutter, the movement distance compensation between the curtain material 3 and the transmission belt 5 is achieved, so that the curtain material 3 always maintains a tensioned state.

[0043] As shown in Figure 3 and Figure 4 The synchronous assembly includes a stepped shaft 6 and a friction assembly 7, the stepped shaft 6 includes a shaft body part 60, a shaft shoulder part 61 and a shaft head part 62, and the outer shape of the shaft head part 62 is in the shape of a D letter. In one example, the axial inner diameters of the shaft body part 60, the shaft shoulder part 61 and the shaft head part 62 are sequentially in a stepped decreasing manner. The outer surface of the shaft body part 60 is matched with the inner surface of the reel 2, so that the shaft body part 60 is connected with the inside of the reel 2. In one example, the shaft body part 60 is inserted into the inside of the reel 2. In another example, the shaft body part can be welded in the inside of the reel 2. The outer surface of the shaft shoulder part 61 is provided with threads, so that the friction assembly is sleeved on the shaft shoulder part 61, and the shaft head part 62 is inserted into the one-way pulley assembly 8.

[0044] The friction assembly 7 includes a first compression screw 71, a friction ring 72 and a wave spring 73, and the first compression screw 71, the friction ring 72 and the wave spring 73 are sequentially sleeved on the threads of the shaft shoulder part. The friction assembly 7 further includes a friction gasket 74, one side of the friction gasket 74 is connected with the wave spring 73 in a matched manner, the friction gasket 74 rotates in the same direction as the shaft head part 62, and in the present embodiment, the inner surface of the friction gasket 74 is matched with the outer shape of the shaft head part 62. As shown in Figure 5 The inner surface of the friction gasket 74 is approximately in the shape of a rounded rectangle, and such a shape enables the friction gasket 74 to be sleeved on the D-shaped shaft head part 62. After the shaft head part 62 is inserted into the one-way pulley assembly, the other side of the friction gasket 74 is matched with the one-way pulley assembly 8. The end of the outer surface of the shaft head part 62 is provided with threads, so that after the shaft head part is inserted into the one-way pulley assembly 8, the end of the shaft head part 62 is fastened and connected with a second compression screw 75.

[0045] It should be noted that the D-shaped shaft head 62 and the friction pad 74 in the embodiment can prevent rotation or slipping in the stepped shaft one-way pulley assembly 8, and the friction between the stepped shaft 6 and the one-way pulley assembly 8 is increased, so that the two rotate synchronously. The wave spring 73 in the embodiment can be replaced by a general spring. The connection in the embodiment can be replaced by welding, for example, the connection between the end of the shaft head and the second compression screw 75.

[0046] The one-way pulley assembly 8 comprises a ratchet pulley 80, a pawl 81, and a pawl support shaft 82. The inner ring of the ratchet pulley 80 is a ratchet gear, the ratchet teeth of the ratchet gear are arranged on the inner circumferential surface of the ratchet gear in the same direction, the front end of the pawl 81 is arranged in the ratchet teeth of the ratchet gear, the root of the pawl 81 is arranged on the outer circumferential surface of the pawl support shaft 82, the outer ring of the ratchet pulley 80 surrounds the drive belt 5, and the pawl support shaft 82 is in driving connection with the synchronous assembly.

[0047] When the rotation direction of the pawl support shaft 82 is the same as the inclination direction of the ratchet teeth of the ratchet gear, the pawl 81 is engaged in the ratchet teeth of the ratchet gear, and the ratchet gear is driven to rotate synchronously with the pawl support shaft 82 in the same direction. When the rotation direction of the pawl support shaft 82 is opposite to the inclination direction of the ratchet teeth of the ratchet gear, the pawl 81 slips in the ratchet teeth of the ratchet gear, and the ratchet gear is not driven to rotate synchronously with the pawl support shaft 82.

[0048] The unwinding process and the winding process of the roller blind are specifically introduced below.

[0049] If the roller blind is not provided with the synchronous assembly in the embodiment, when the roller blind is unwound, the pawl is in the engaged state, the ratchet pulley is combined with the pawl support shaft as a whole and rotates together, and has the characteristic of one-way transmission of the rotation torque. If it is required that the blind material is always in the tension state, the diameter of the ratchet pulley belt should generally be greater than or equal to the diameter of the blind material wound on the transmission pipe. However, if the diameter of the blind material wound on the transmission pipe is greater than the diameter of the ratchet pulley belt, the blind material is in the relaxed state after the roller blind is opened in this state. When the roller blind moves to the position where the two diameters are equal, that is, the diameter of the blind material wound on the transmission pipe is equal to the diameter of the ratchet pulley belt, the blind material begins to be tensioned. With the increase of the moving distance, the blind material is gradually tensioned. The synchronous assembly in the embodiment plays the role of the motor clutch to compensate the distance, so that the diameter of the ratchet pulley belt can be less than the diameter of the blind material wound on the transmission pipe, and the tension state of the blind material can be maintained.

[0050] When the roller shutter needs to be unrolled for shading, the motor rotates forward as a power source, thereby driving the roller shaft to rotate, driving the pawl support shaft through the synchronous assembly, and driving the ratchet gear to rotate, thereby driving the transmission belt to move the bottom end of the curtain material through the bottom rail. At this time, the diameter of the ratchet gear belt is greater than the diameter of the curtain material wound on the roller shaft, and the linear speed of the bottom rail on the transmission belt is greater than the linear speed of the curtain material on the transmission pipe, that is, the bottom rail is fixed on the transmission belt, and the bottom end of the curtain material is fixed on the bottom rail. Due to the difference in linear speed between the bottom end of the curtain material and the top end of the curtain material, two forces in opposite directions are formed, so that the curtain material has tension and is always in a tension state.

[0051] Since the curtain material wound on the roller shaft and the one-way pulley assembly are coaxially installed and rotate in the same direction, the difference in diameter causes the same distance difference to gradually increase with the increase in the number of rotations, and the tension on the curtain material also gradually increases. At this time, the transmission path of the rotational torque is the power source, the roller shaft, the stepped shaft, the first compression screw, the wave spring, the friction pad, and the pawl support shaft. Since the inner circle of the pawl support shaft is circular and the shaft head of the stepped shaft is D-shaped, and the outer diameter of the shaft head of the stepped shaft is smaller than the inner diameter of the inner circle of the pawl support shaft, the stress on the friction pad will become larger and larger. When the stress on the friction pad accumulates to a certain extent, that is, when the stress is greater than the friction force provided by the wave spring, the friction pad starts to slip along the axis, causing the pawl support shaft and the stepped shaft to no longer rotate at the same speed. The slippage distance is exactly the distance the transmission belt moves minus the distance the curtain material moves, so that the curtain material remains tensioned during unrolling. When the curtain material stops moving, since the ratchet gear in the one-way pulley assembly has one-way property, it can prevent the transmission belt from moving in the opposite direction, thereby preventing the curtain material from relaxing and sagging due to gravity.

[0052] When the curtain material needs to be rolled up to open, the motor rotates in the opposite direction. At this time, the transmission path of the rotational torque is the rotation of the roller shaft, the rotation of the curtain material, the translation of the bottom rail, the translation of the transmission belt, and the rotation and slippage of the one-way pulley assembly, thereby preventing the force on the transmission from being transmitted in the opposite direction to the roller shaft. The rotation of the roller shaft drives the curtain material to translate, and at the same time, the curtain material also drives the bottom rail to translate. The translation of the bottom rail drives the one-way pulley assembly to rotate through the transmission belt. At this time, the rotation of the one-way pulley assembly can be divided into the following two cases.

[0053] The first case is that the diameter of the ratchet gear belt is greater than the diameter of the curtain material wound on the roller shaft. Since the curtain material and the transmission belt are combined with the bottom rail, the movement distance of the transmission belt is the same as that of the curtain material. Moreover, the transmission belt is connected with the one-way pulley assembly, the top end of the curtain material is connected with the roller shaft, the diameter of the ratchet gear belt is greater than the diameter of the curtain material wound on the roller shaft, and the one-way pulley assembly can rotate around the stepped shaft, so that the rotation angle of the roller shaft is large and the rotation angle of the one-way pulley assembly is small. At this time, the pawl starts to slip, and the distance of the pawl slipping per revolution is the product of the radius of the pawl and the angle difference, that is:

[0054] R 棘爪处半径 ×(2π(unidirectional belt reel radius - curtain radius) / R) 单向带盘半径 ))

[0055] The angle difference is the difference in rotation angle caused by the different radii when the ratchet pulley and the cord material move parallel to each other for the same distance. As the diameter of the cord material increases, the position difference per revolution becomes smaller and smaller, and the slippage frequency also decreases. Therefore, the one-way pulley assembly is always in a meshed state during the winding process to prevent the cord material from losing tension control.

[0056] The second scenario involves a section of the fabric wound on the spool with a diameter larger than the diameter at the ratchet pulley belt. Due to the smaller rotation angle of the spool and the larger rotation angle of the ratchet pulley, the pawl cannot disengage and remains engaged, preventing slippage. The force transmitted by the drive belt passes through the friction pads at the front of the stepped shaft, creating a speed difference between the inner ring of the ratchet and the stepped shaft, thus subjecting the friction pads to stress. When the accumulated stress on the friction pads reaches a certain level—that is, when the stress exceeds the frictional force provided by the wave spring—the friction pads begin to slip along the shaft. This causes the pawl support shaft and the stepped shaft to no longer rotate synchronously in a 1:1 ratio. The slippage angle of the friction pads suppresses the speed difference caused by the difference in diameter on both sides, thereby suppressing the speed difference between the drive belt and the fabric.

[0057] Example 2

[0058] like Figures 8 to 14 As shown, the difference between the roller blind disclosed in this embodiment and Embodiment 1 is that it uses a friction component 7 and a one-way pulley assembly 8 with different structures. A single friction ring 72 is used on the surface of the trapezoidal shaft 6, and a clamping force is applied to the one-way pulley assembly 8 to achieve the friction effect.

[0059] like Figure 10 As shown, the one-way pulley assembly 8 in this embodiment includes a pulley 83, a clamping hoop 84, a ratchet pulley 85, a pawl 81, and a pawl support shaft 82. The outer ring of the pulley 83 is surrounded by the transmission belt 5. The pulley 83 is looped around the clamping hoop 84, and the clamping hoop 84 is looped around the outer ring of the ratchet pulley 85.

[0060] The inner ring of the ratchet wheel 85 is a ratchet wheel, the ratchet teeth of which are arranged on the inner circumferential surface of the ratchet wheel in the same direction of inclination, the front end of the pawl 81 is placed in the ratchet teeth of the ratchet wheel, the root of the pawl 81 is arranged on the outer circumferential surface of the pawl supporting shaft 82, and the pawl supporting shaft 82 is in driving connection with the synchronous assembly. When the rotation direction of the pawl supporting 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 supporting shaft in the same direction. When the rotation direction of the pawl supporting 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 supporting shaft.

[0061] The inner ring of the belt pulley 83 is provided with a plurality of grooves 831, the outer ring of the clamping hoop 84 is provided with a plurality of protrusions 841 corresponding to the grooves 831, and the grooves 831 and the protrusions 841 are one-to-one corresponding and fitted, so that the belt pulley 83 is sleeved on the clamping hoop 84. The clamping hoop 84 comprises a ring hoop body and at least two wing plates connected with the ring hoop body, each wing plate is provided with a bolt connection hole, the belt pulley 83, the clamping hoop 84 and the ratchet wheel 85 are synchronously clamped and moved by the clamping force formed by the bolt connection.

[0062] The shaft body part 60 of the stepped shaft 6 is inserted into the inside of the reel 2, as shown in the figure, Figure 11 The shaft head part 62 of the stepped shaft 6 is inserted into the pawl supporting shaft 82, and the clamping force is formed between the belt pulley 83 and the ratchet wheel 85 through the clamping hoop 84. As shown in the figure, Figure 12 The ring hoop body of the clamping hoop 84 is provided with a plurality of arc-shaped protrusions 841 at intervals, the bolt passes through the bolt connection hole to connect the two wing plates, the shape of the ring hoop body is adjusted by adjusting the locking degree of the bolt, and the position of each protrusion 841 is adjusted, so that each protrusion 841 is fitted in each groove 831 on the inner ring of the belt pulley 83. It should be noted that the positions of the grooves 831 and the protrusions 841 can be interchanged, for example, a plurality of protrusions 841 are arranged on the inner ring of the belt pulley 83, and the outer ring of the clamping hoop 84 is provided with a plurality of grooves 831 corresponding to the protrusions 841, and the protrusions 841 are one-to-one corresponding and fitted, so that the belt pulley 83 is sleeved on the clamping hoop 84.

[0063] When the roller shutter needs to be unwound for shading, the motor rotates forward as a power source, thereby driving the roller shaft to rotate, and driving the pawl support shaft, the pawl, the ratchet pulley, the clamping hoop and the belt pulley to rotate via the synchronous assembly, thereby driving the transmission belt to drive the curtain material at the bottom end of the bottom rail to translate. The curtain material wound on the roller shaft and the one-way pulley assembly are coaxially installed and rotate in the same direction. The different diameters of the two cause the difference in the same direction distance to gradually increase with the increase of the number of rotation circles, and the tension on the curtain material gradually increases. The force of the clamping hoop between the ratchet pulley and the belt pulley also gradually increases. When the force of the clamping hoop accumulates to a certain extent, the clamping hoop starts to slip along the axis, and the protrusions on the clamping hoop slip out of the original corresponding grooves on the belt pulley and fall into other grooves on the belt pulley with the slippage. This slippage causes the pawl support shaft and the belt pulley to no longer rotate synchronously at 1:1, and the slippage distance is exactly the transmission belt movement distance minus the curtain material movement distance, so that the curtain material is kept tensioned during unwinding. When the curtain material stops moving, the ratchet gear in the one-way pulley assembly has unidirectionality, which can prevent the transmission belt from moving in the opposite direction, thereby preventing the curtain material from relaxing and sagging due to gravity.

[0064] The above describes the preferred embodiments of the present application in detail, but does not exhaust all the embodiments. It should be understood that those skilled in the art can make many modifications and changes to the embodiments according to the concept of the present application without creative labor. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment based on the existing technology according to the concept of the present application should be within the protection scope defined by the claims.

Claims

1. A roller shade, comprising: The application relates to a roller, curtain material wound on the roller, a fixed end of the curtain material arranged on the roller, a free end of the curtain material provided with a bottom rail, one end of the roller connected with a synchronous assembly, the synchronous assembly rotating along with the roller, the synchronous assembly sleeved with a one-way pulley assembly, the surface of the one-way pulley assembly surrounded by a transmission belt, the bottom rail connected with the transmission belt, so that during the winding or unwinding of the curtain material, the roller is driven to rotate by a power source, the synchronous assembly and the one-way pulley assembly are driven to rotate, the one-way pulley assembly drives the transmission belt to translate, and the transmission belt drives the free end of the curtain material and the bottom rail to synchronously translate.

2. The roller shade of claim 1, wherein, The synchronous assembly comprises a stepped shaft and a friction assembly, the stepped shaft comprising a shaft body, a shaft shoulder and a shaft head; The surface of the shaft body is matched with the surface of the roller, so that the shaft body is connected with the inside of the roller, the surface of the shaft shoulder is provided with threads, so that the friction assembly is sleeved on the shaft shoulder, and the shaft head is inserted into the one-way pulley assembly.

3. The roller shade of claim 2, wherein, The outer shape of the shaft head is D-shaped.

4. The roller shade of claim 2, wherein, The friction assembly comprises a first compression screw, a friction ring and a spring, the first compression screw, the friction ring and the spring being sleeved on the threads of the shaft shoulder in sequence.

5. The roller shade of claim 4, wherein, The friction assembly further comprises a friction gasket, one side of the friction gasket being connected with the spring, and the friction gasket rotating in the same direction with the shaft head, so that after the shaft head is inserted into the one-way pulley assembly, the other side of the friction gasket is matched with the one-way pulley assembly.

6. The roller shade of claim 2, wherein, The end of the surface of the shaft head is provided with threads, so that after the shaft head is inserted into the one-way pulley assembly, the end of the shaft head is fastened with a second compression screw.

7. The roller shade of any of claims 1-3, wherein, The one-way pulley assembly comprises a ratchet gear, a pawl and a pawl support shaft, the inner ring of the ratchet gear being a ratchet gear, the ratchet teeth of the ratchet gear being arranged on the inner side circumferential surface of the ratchet gear and inclined in the same rotating direction, the front end of the pawl being arranged in the ratchet teeth of the ratchet gear, the root of the pawl being arranged on the outer side circumferential surface of the pawl support shaft, the ratchet gear surrounding the transmission belt, and the pawl support shaft being in transmission connection with the synchronous assembly. When the rotating direction of the pawl support shaft is the same as the inclination direction of the ratchet teeth of the ratchet gear, the pawl is engaged in the ratchet teeth of the ratchet gear, the ratchet gear is driven to rotate in the same direction with the pawl support shaft; when the rotating direction of the pawl support shaft is opposite to the inclination direction of the ratchet teeth of the ratchet gear, the pawl slips in the ratchet teeth of the ratchet gear, and the ratchet gear is not driven to rotate in synchronization with the pawl support shaft.

8. The roller shade of any of claims 1-3, wherein, The one-way pulley assembly comprises a pulley, a clamping hoop, a ratchet pulley, a pawl and a pawl support shaft, the pulley surrounds the transmission belt, the pulley is sleeved on the clamping hoop, the clamping hoop is sleeved on the ratchet pulley, the inner ring of the ratchet pulley is a ratchet gear, the ratchet teeth of the ratchet gear are arranged on the inner side circumferential surface of the ratchet gear and inclined to the same rotation direction, the front end of the pawl is arranged in the ratchet tooth of the ratchet gear, the root of the pawl is arranged on the outer side circumferential surface of the pawl support shaft, and the pawl support shaft is in driving connection with the synchronous assembly. When the rotation direction of the pawl support shaft is the same as the inclination direction of the ratchet tooth of the ratchet gear, the pawl is engaged in the ratchet tooth of the ratchet gear, the ratchet gear is driven to rotate synchronously with the pawl support shaft and in the same direction; when the rotation direction of the pawl support shaft is opposite to the inclination direction of the ratchet tooth of the ratchet gear, the pawl slips in the ratchet tooth of the ratchet gear, and the ratchet gear is not driven to rotate synchronously with the pawl support shaft.

9. The roller shade of claim 8, wherein, The inner ring of the pulley is provided with a plurality of grooves or protrusions, the outer ring of the clamping hoop is provided with a plurality of protrusions or grooves, and the grooves and the protrusions are matched one by one to make the pulley sleeved on the clamping hoop.

10. The roller shade of claim 8, wherein, The clamping hoop comprises an annular hoop body and at least one wing plate connected with the annular hoop body, each wing plate is provided with a bolt connection hole, the bolt connection hole is connected by a bolt to form a clamping force, so that the pulley, the clamping hoop and the ratchet pulley are synchronously clamped and moved. The inner ring of the pulley is provided with a plurality of grooves or protrusions, the outer ring of the clamping hoop is provided with a plurality of protrusions or grooves, and the grooves and the protrusions are matched one by one to make the pulley sleeved on the clamping hoop. The clamping hoop comprises an annular hoop body and at least one wing plate connected with the annular hoop body, each wing plate is provided with a bolt connection hole, the bolt connection hole is connected by a bolt to form a clamping force, so that the pulley, the clamping hoop and the ratchet pulley are synchronously clamped and moved.

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