TWM649553U - Venetian blinds - Google Patents

Abstract

A window blind including an upper rail, a bottom rail, plural slats, at least two lifting bands and a lifting control mechanism. Each of the lifting bands is a thin ribbon having one end threading through the slats and connected to the bottom rail. The lifting control mechanism is disposed on the upper rail and includes a driving wheel, a spiral spring and at least one band-reeling wheel, wherein one end of the spiral spring is connected to the driving wheel to accumulate or release an elastic force, and the driving wheel and the band-reeling wheel are connected to each other. The at least one band-reeling wheel has at least one annular groove rail, while the lifting control mechanism is configured to include two or more than two annular groove rails in total, such that each of the lifting bands can be wound on or released from the corresponding one of the annular groove rails. The turns of the respective lifting bands are neatly placed on top of the other, so that the length of the two lifting bands between the upper rail and the bottom rail remain the same.

Description

Venetian blinds

This creation relates to a kind of blind, especially a cordless blind that can be unfolded or folded by rolling up a thin strip.

A typical cordless blind includes an upper beam, a lower beam, a plurality of blades, at least one pair of ladder ropes and at least one pair of lifting ropes. Wherein, each ladder rope is composed of a pair of warp threads arranged front and back and a plurality of weft threads arranged between the two warp threads and is in the shape of a ladder. The blades are respectively supported on the weft threads and are arranged on each side. In the ladder grid. When one of the pair of warp lines of each ladder rope moves upward and the other moves downward, the weft lines drive the blades to tilt, so that the blades can switch between a horizontal state and a closed state. The two lifting ropes are respectively arranged adjacent to the position of the pair of ladder ropes. The upper end of each lifting rope is fixed to a spool of a lifting control mechanism in the upper beam, and the lower end is connected to the lower beam after passing through the perforations of the blades, thereby suspending the lower beam below the upper beam. At the same time, each lifting rope is retracted or released by the reel as the blind is folded or unfolded.

However, when the blades are in the closed state, each blade cannot be flipped to a completely vertical state because the two lifting ropes will be sandwiched between each pair of adjacent blades, forming a distance of a wire diameter, resulting in A certain amount of light leakage prevents the venetian blinds from completely blocking the light. In addition, when each lifting rope is taken up and wound on the spool, there is no guarantee that each turn will They are arranged neatly next to the previous circle in sequence, causing the parts of the two lifting ropes to be rolled up by the reels to be unequal lengths. This further causes the lengths of the two lifting ropes to be inconsistent between the upper beam and the lower beam, causing the lower beam to be lowered. The beam cannot maintain a horizontal state and is skewed from side to side, resulting in a visually unsightly appearance.

What's more, the two lifting ropes will gradually expand and deform due to the influence of gravity or hand pulling during long-term suspension and operation of the lower beam. If the deformation values of the two lifting ropes are different, the lower beam will be skewed. When the cordless blinds have a total of three lift cords, the lift cord in the middle will stretch to a greater extent due to the greatest force than the lift cords on the sides, resulting in When the lower beam is suspended by the three lifting cords, it will be arched and cannot be folded in a horizontal state and will lie flat under the blades, affecting the overall appearance of the cordless blind.

In view of the above-mentioned conventional problems, one of the purposes of this invention is to provide a venetian blind that can be unfolded or folded by rolling a thin strip. After closing, the gap between the blades is smaller, the light-shielding effect is better, and During the folding process, it can be ensured that the lower beam remains level and does not tilt.

According to the purpose of this invention, a blind is provided, which includes an upper beam, a lower beam, at least two ladder ropes, a plurality of blades, at least two lifting straps and a lifting control mechanism. Each blade has a first through hole and a second through hole. The lifting control mechanism includes a driving wheel, a scroll spring and at least one winding pulley. One end of the scroll spring is connected to the driving wheel to be wound around or released from the driving wheel according to the rotation direction of the driving wheel. At least one pulley is connected to the driving wheel and is arranged parallel to the driving wheel. Wherein, when one of the driving wheel and the take-up wheel rotates, the other will be driven to rotate synchronously. Each pulley has at least one annular channel, and in the lifting control machine The number of the annular channels configured in the structure is at least two or more, which is enough for the lifting straps to be arranged correspondingly. The width of each annular channel corresponds to the wide side of each lift strap. Each lift strap is wound around or released from each annular channel, and each turn of each lift strap is generally aligned and stacked on top of another turn.

When the blinds are unfolded, the two lifting straps are released from the take-up wheel, thereby driving the take-up wheel to rotate in a first direction, and then driving the driving wheel to rotate forward, so that the scroll spring is wound to the on the driving wheel and accumulates an elastic force. When the blind is folded, the scroll spring releases the elastic force and is released from the driving wheel. The scroll spring drives the driving wheel to rotate in the opposite direction, and then drives the take-up wheel to rotate in a second direction to retract the two lifting straps. Wherein, the second direction and the first direction are opposite directions.

In one embodiment of the invention, the blind further includes at least two steering devices located on the upper beam. Each steering device includes a first arc-shaped element, a base and a second arc-shaped element, wherein the first The arc-shaped element has at least one arc surface, and the second arc-shaped element includes at least one arc-shaped piece disposed on the base. After the two lifting straps extend from the lifting control mechanism, they respectively bypass the arc surfaces of the first arc-shaped elements of the two steering devices, and each extend along a transmission direction to and bypass the corresponding third steering device. The two arc-shaped components pass through the upper beam. Thereafter, the two lifting straps respectively extend toward the first through holes and the second through holes of the blades.

Preferably, the first arc-shaped element is a pair of rollers, each roller having an arc surface. After each lifting rope extends from the lifting control mechanism, it goes around the two arc surfaces of the two rollers in sequence.

Preferably, each arc-shaped member is a positioning roller, with a convex wall at both axial ends, and a recessed portion in the axial center between the two convex walls, so that each lifting strap can bypass the two convex walls. When positioning the roller, it will be restricted by the two convex walls in the recessed portion.

Preferably, the arc-shaped part of the second arc-shaped element is selectively installed at a first position or a second position on the base. Wherein, the distance from the first arc-shaped element along the transmission direction to the first position is smaller than the distance from the first arc-shaped element along the transmission direction to the second position. When the arc-shaped component is installed in the second position, the second arc-shaped component further includes an auxiliary component. After each lifting strap goes around the arc surface of the first arc-shaped element, it goes around the arc-shaped component and the auxiliary component in sequence, and then passes out of the upper beam.

In one embodiment of the invention, the upper beam further includes a light transmission adjustment mechanism to control the up and down misalignment of the two warp lines of each ladder rope, thereby driving the blades to flip between a horizontal position and a closed position. One side of the upper beam defines a lateral datum. The position where the two warp threads of one of the two ladder ropes passes through the bottom surface of the upper beam is separated from the lateral reference plane by a first distance; the two warp threads of the other of the two ladder ropes pass from the upper beam. The position where the bottom surface of the beam penetrates is separated from the lateral datum plane by a second distance; the position where one of the two lifting straps penetrates from the bottom surface of the upper beam is separated by a third distance from the lateral datum plane; The position where the other of the two lifting straps passes through the bottom surface of the upper beam is spaced a fourth distance from the lateral reference plane. Wherein, the above-mentioned first distance, the second distance, the third distance and the fourth distance are substantially different.

In one embodiment of this invention, the venetian blinds of this invention have at least the following advantages in use:

(1) When the venetian blinds of this invention are in the closed state, the space formed by the thin lifting straps sandwiched between each two adjacent blades is smaller than the width of the space formed by ordinary ropes with larger wire diameters. . Therefore, the blinds of this invention have a better light-blocking effect after being closed.

(2) Since the lifting straps of the blinds of the present invention are neatly wound on each annular channel of the winding wheel, the blinds of the present invention can ensure that the two lifting straps are rolled up during the process of rolling up the two lifting straps. The length of the belt between the upper beam and the lower beam is the same, thereby keeping the lower beam in a horizontal state without being skewed.

(3) The arc-shaped part of the second arc-shaped element in the turning device of the blinds of the present invention can be selectively installed at different positions on the base during the assembly stage and used with auxiliary parts when installed in a second position. This provides adjustable resistance, so that the steering device can be applied to venetian blind products of different specifications at the same time.

(4) The position of the lifting straps and the warp threads passing through the upper beam of the blinds of this invention are staggered from each other, which can prevent the lifting straps from contacting and cutting the warp threads.

(5) The lifting straps of the blinds of this invention are not easy to stretch and deform under long-term stress, which can avoid the problem of the lower beam being skewed due to deformation of the straps after long-term use.

100, 200: Venetian blinds

1, 10: Upper beam

11, 110: Light transmission adjustment mechanism

111:Rotating axis

112, 1120: Translucent adjustment wheel body

1121: Fixed seat

113: Transmission device

114:Operation lever

2.20: Lower beam

3. 30: Ladder rope

31, 310, 32, 320: longitude

33:Support

4. 40: Blades

41, 410: first perforation

42, 420: Second perforation

430:Third piercing

440:Fourth piercing

5. 50: Lifting strap

6, 60, 68: lifting control mechanism

6a: Cover plate

61, 601, 681: Base

611, 612, 613: Shaft column

62, 602, 682: driving wheel

63, 603, 683: Spring storage wheel

64, 604, 684: scroll spring

65, 605, 606, 685, 686: take-up pulley

651, 652, 6051, 6052, 6061, 6062, 6851, 6861: Annular channel

66, 607, 687: Guide roller

661, 6071: First channel

662, 6072: Second channel

67: Resistance mechanism

671: Friction parts

672: First limiting piece

6721:Cantilever

673: Second limiter

7, 70, 8, 8’, 9, 90: steering device

71, 81, 91, 901: first arc component

711: Thin shell parts

712:ribs

72, 710, 82, 92, 902: Base

721, 716, 821, 921, 9021: Tape exit hole

722, 723, 822, 823, 922, 923: Cable outlet

73, 83, 83’, 93, 903: Second arc element

731, 831, 831’, 931, 932: Positioning roller

7311:Protruding wall

7312: depression

832: Auxiliary roller

933: Arc structure

9011, 9012: Metal shaft

9031:The first metal shaft

9032:Second metal shaft

E, E’: direction

A: Circle

A1: first axis

A2: Second axis

BS: broadside

LP: lateral reference plane

LS: long side

NS: narrow edge

D1: first distance

D2: second distance

D3: The third distance

D4: The fourth distance

SS: short side

TD: transmission direction

T1: first predetermined bending path

T2: second predetermined bending path

T3: The third predetermined bending path

[Figure 1] is a perspective view of the venetian blind according to the first embodiment of the present invention, and the venetian blind is in a completely light-transmitting state.

[Figure 1A] is an enlarged view of circle A in Figure 1.

[Figure 2] is a perspective view of the venetian blind in Figure 1, and the venetian blind is in a closed state.

[Fig. 3] is a side view of the venetian blind in the state shown in Fig. 2.

[Figure 4] is a perspective view of the venetian blind in Figure 1. The venetian blind is in a completely light-transmitting state, and the upper beam and the cover plate of the lifting control mechanism are omitted.

[Figure 5] is a perspective view of the venetian blind in Figure 1. The venetian blind is in a fully folded state, and the upper beam and the cover plate of the lifting control mechanism are omitted.

[Fig. 6] is a perspective view of the lifting control mechanism in Fig. 4, and its cover is omitted.

[Fig. 7] is a side view of the take-up pulley in Fig. 6.

[Figure 8] is a perspective view of the guide roller in Figure 6.

[Figure 9] is an exploded schematic diagram of the lifting control mechanism in Figure 6.

[Fig. 10] is a bottom view of the lifting control mechanism in Fig. 6.

[Figure 11] is a perspective view of another implementation aspect of the lifting control mechanism in the first embodiment of the present invention.

[Figure 12] is a perspective view of the venetian blind according to the second embodiment of the present invention.

[Figure 13] is a perspective view of the venetian blind in Figure 12, with part of the lower beam omitted.

[Fig. 14] is an enlarged schematic diagram of the lifting control mechanism in Fig. 13, and the ladder rope is omitted.

[Figure 15] is a perspective view of the steering device, light-transmitting adjustment wheel body and part of the ladder rope of the blind in Figure 4.

[Fig. 16] is a perspective view of the steering device of the blind in Fig. 4, and the base shown is omitted.

[Fig. 17] is a partially exploded schematic view of the steering device of the venetian blind in Fig. 4 from another perspective.

[Fig. 18] is a front view of the positioning roller in Fig. 16.

[Figure 19] is a bottom view of the upper beam of the venetian blind in Figure 1.

[Fig. 20] is a perspective view of another steering device in the first embodiment of the present invention.

[Fig. 21] is a perspective view of the steering device in Fig. 20, with the base shown being omitted.

[Fig. 22] is a cross-sectional view along line A-A in Fig. 20.

[Fig. 23] is a cross-sectional view taken along line B-B in Fig. 20.

[Fig. 24] is a schematic diagram of another arrangement of the steering device in Fig. 20.

[Fig. 25] is a schematic structural diagram of another steering device in the first embodiment of the present invention.

[Fig. 26] is a perspective view of the steering device in another embodiment of the first embodiment of the present invention, with the base shown being omitted.

Please refer to Figures 1 to 4. In the first embodiment of the invention, the venetian blind 100 includes an upper beam 1, a lower beam 2, two ladder ropes 3, a plurality of blades 4, two lifting straps 5, a Lift control mechanism 6 and two steering devices 7. The upper beam 1 and the lower beam 2 located below it are parallel to a direction E, and define a first axis A1 that is substantially perpendicular to the direction E. The upper end of each ladder rope 3 is respectively connected to each steering device 7 provided on the upper beam 1, and the lower end of each ladder rope 3 is connected to the lower beam 2 respectively, and each ladder rope 3 includes two warp threads 31 spaced in front and back. , 32 and a plurality of supporting members 33. The supporting members 33 are at least one thin rope connected between the two warp lines 31 and 32 and are spaced apart from each other and arranged between the two warp lines 31 and 32 for supporting. The blades 4.

The blades 4 respectively bear on the supports 33 of the ladder ropes 3 and are arranged between the upper beam 1 and the lower beam 2 . Each blade 4 is provided with a first through hole 41 and a second through hole 42, which are distributed near the two ends of the blade 4 along the extension direction of one longitudinal side of the blade 4. As shown in Figure 1A, the two lifting straps 5 are respectively thin strips with a wide side BS and a narrow side. Side NS can be made of metal (for example: aluminum), plastic (for example: PET) or plastic steel. The lower ends of the two lifting straps 5 respectively pass through the first through holes 41 and the second through holes 42 of the blades 4 and are fixedly connected to the lower beam 2 . It is worth noting that compared with braided ropes, the shape and material of the two lifting straps 5 can better withstand the force exerted by the components of the venetian blind 100 and not be easily stretched and deformed. In other words, even if the venetian blind 100 is maintained in the unfolded state for a long time and used with the two lifting straps 5 suspended from the lower beam 2, or is subjected to manual force to pull the lower beam 2 downward for a long time, the longitudinal length of the two lifting straps 5 is not easy to change. This ensures that the lower beam 2 can maintain a horizontal state without being skewed.

In this embodiment, the first through hole 41 and the second through hole 42 are respectively elongated holes opened along the extending direction of a transverse short side of each blade 4 . As shown in Figure 1A, the elongated hole has a short side SS and a long side LS. The length of the short side SS is slightly larger than the length of the wide side BS of each lifting strap 5 to accommodate the passage of each lifting strap 5. in. Among them, when each lifting strap 5 passes through each elongated hole, the wide side BS of each lifting strap 5 is substantially parallel to the extending direction of a longitudinal long side of each blade 4, and the wide side BS of each lifting strap 5 is The distance between both sides of the elongated hole is about 0.5 mm from the inner edge of the elongated hole.

The lifting control mechanism 6 is used to control the retraction and release of the lifting straps 5 and can be installed on the upper beam 1 or the lower beam 2 . The two steering devices 7 are used to change the extension direction of the two lifting straps 5 and are arranged on the upper beam 1 or the lower beam 2 together with the lifting control mechanism 6 .

Please refer to Figures 4 to 6. In this embodiment, the lifting control mechanism 6 is provided in the upper beam 1 and includes a base 61, a driving wheel 62, a spring storage wheel 63, a scroll spring 64, A pulley 65 and a plurality of guide rollers 66. Preferably, the lifting control mechanism 6 further includes a cover 6a (shown in FIG. 1 ) located above the base 61 . The base 61 has three shaft columns 611, 612 and 613, which respectively extend in a direction parallel to the first axis A1 (as shown in Figure 9), and the spring storage wheel 63, The wheel body of the driving wheel 62 and the wheel body of the take-up pulley 65 are respectively sleeved thereon. The two ends of the scroll spring 64 are connected to the spring storage wheel 63 and the wheel body of the driving wheel 62 respectively, and will be retracted or released from the wheel body of the driving wheel 62 according to the rotation direction of the driving wheel 62 . In addition, the toothed disc under the wheel body of the driving wheel 62 engages the toothed disc under the wheel body of the take-up pulley 65, so that the driving wheel 62 and the take-up pulley 65 are connected to each other and arranged in a parallel direction, and when The rotation of one of the driving wheel 62 and the take-up wheel 65 will drive the other to rotate synchronously. The take-up pulley 65 has two annular grooves 651 and 652 for the upper ends of the two lifting straps 5 to be respectively fixed and wound on. The guide rollers 66 are disposed on the base 61 adjacent to the take-up wheel 65 and are used to change the extending direction of the two lifting straps 5 .

Referring to FIG. 7 , the width W1 of each of the two annular grooves 651 and 652 of the take-up pulley 65 along the first axis A1 is only slightly larger than the length W2 of the wide side BS of each lifting strap 5 . More specifically, the width W1 of each annular channel 651 or 652 is greater than the length W2 of the wide side BS of each lifting strap 5, and at the same time is less than 2 times the length W2 of the wide side BS of each lifting strap 5, so as to avoid Each turn of each lifting strap 5 slides and displaces along the first axis A1 when being stacked on top of another turn. Preferably, the width W1 is about 1.5 times the length W2 of the wide side BS of each lifting strap 5 . Therefore, when each lift strap 5 is wound around the corresponding annular channel 651 or 652, each turn thereof is substantially aligned and stacked above the other turn. Different from the conventional lifting ropes that can only be wound on the reel in an irregular manner, this neat overlapping method can ensure that the lengths of the two lifting ropes 5 rolled up by the winding pulley 65 are consistent, thereby ensuring The lower beam 2 maintains a horizontal state during the rising process.

Please refer to FIG. 8 . The guide roller 66 has three disks spaced apart along the first axis A1 . A first channel 661 and a second groove are formed between two adjacent disks. Road 662.

Please refer back to FIG. 6 . After the two lifting straps 5 extend from the take-up pulley 65 , one of the lifting straps 5 correspondingly bypasses the first grooves 661 of the guide rollers 66 to change its extension direction. A lifting belt 5 accordingly bypasses the second grooves 662 of the guide rollers 66 and changes its extension direction. Thereafter, the two lifting straps 5 pass through the two steering devices 7 respectively, and are changed in their extension direction again to extend to the lower beam 2 along the first axial direction A1.

Referring to Figures 4 to 6, when the user wants to unfold the folded venetian blind 100 (shown in Figure 5) and pulls down the lower beam 2, the blades 4 are gradually unfolded, and the two lifting straps 5 follow. The movement of the lower beam 2 is released from the two annular grooves 651 and 652 of the pulley 65 respectively. At this time, the take-up pulley 65 is driven by the lifting straps 5 to rotate in a first direction (for example, the clockwise direction as shown in FIG. 6 ), and then drives the driving wheel 62 in the forward direction (for example, as shown in FIG. 6 (as shown in the counterclockwise direction), the scroll spring 64 is wound around the driving wheel 62 and accumulates an elastic force.

Correspondingly, when the user wants to close the venetian blind 100 and lifts the lower beam 2, the blades 4 are gradually closed, and the scroll spring 64 is released because the movement of the lower beam 2 destroys the overall balance of the venetian blind 100. The previously accumulated elastic force is released from the driving wheel 62 and wound back to the spring storage wheel 63 . The driving wheel 62 is driven by the scroll spring 64 to rotate in the opposite direction, thereby driving the winding wheel 65 to rotate in a second direction opposite to the first direction, and the two lifting straps 5 are wound around the two lifting straps 5 respectively. On the annular channels 651 and 652.

Please refer to Figure 9 and Figure 10. The lifting control mechanism 6 further includes a resistance mechanism 67 that is operatively connected to the take-up pulley 65 to provide resistance to the take-up pulley 65 when the take-up pulley 65 rotates in the first direction. In this embodiment, the resistance mechanism 67 includes a friction member 671, a first limiting member 672 and a second limiting member 673. The friction member 671 is a closed ring made of elastic material. And sleeved on the shaft column 612, the first limiting member 672 is provided on the periphery of the friction member 671 and has a plurality of cantilevers 6721 protruding radially outward, and the second limiting member 673 is the lower tooth of the driving wheel 62. The inner ring gear of the disk is arranged corresponding to the periphery of the first limiting member 672 and has a plurality of ratchet teeth arranged corresponding to the cantilevers 6721 .

When the user unfolds the blind 100, the take-up wheel 65 rotates in the first direction (for example, the counterclockwise direction as shown in Figure 10) and drives the driving wheel 62 in the forward direction (for example, the clockwise direction as shown in Figure 10) When rotating, the second limiting member 673 will rotate relative to the first limiting member 672 until the cantilever 6721 of the first limiting member 672 engages the ratchet of the second limiting member 673 . Thereafter, the second limiter 673 will drive the first limiter 672 to rotate synchronously, so that the first limiter 672 generates friction force relative to the friction member 671, or the first limiter 672 drives the friction member 671 to rotate relative to the shaft column 612. And produce friction. Thereby, the resistance mechanism 67 provides friction force for the rotation of the driving wheel 62 , and because the take-up pulley 65 is connected to the driving wheel 62 , the resistance mechanism 67 also indirectly provides friction force for the rotation of the take-up pulley 65 . In other embodiments of the present invention, the resistance mechanism can also be disposed on the take-up pulley 65 and the shaft column 613 and directly provide friction for the rotation of the take-up pulley 65 .

What's more, the resistance mechanism 67 provides one-way resistance. In other words, the resistance mechanism 67 only provides resistance to the rotation of the take-up pulley 65 when the take-up pulley 65 rotates in the first direction. When the take-up pulley 65 rotates in the second direction, the resistance mechanism 67 does not provide resistance to the rotation of the take-up pulley 65 . Specifically, when the user closes the venetian blind 100 and causes the take-up pulley 65 to rotate in the second direction opposite to the first direction and drive the driving wheel 62 to rotate in the opposite direction, the second limiting member 673 will move relative to the first direction. A limiting member 672 rotates. At this time, the cantilever 6721 of the first limiting member 672 detaches from between the ratchet teeth and sequentially slides through the tooth tops of the ratchet teeth, so that the first limiting member 672 does not follow the ratchet teeth. The second limiting member 673 rotates synchronously, and there is no relative movement between the first limiting member 672 and the friction member 671, or between the friction member 671 and the shaft column 612. In other words, at this time, neither the first limiting member 672 nor the friction member 671 will generate frictional force on the rotation of the second limiting member 673 .

The number of ladder ropes and lifting straps of the blinds of this invention is not limited to the above examples. More than two ladder ropes and/or lifting straps can be configured to match the larger width of the blinds. However, at least two ladder straps and two lifting straps must be configured to ensure that the blades are evenly stressed. In order to correspond to the number of lifting straps, the lifting control mechanism of the blinds of this invention is configured to include two or Two or more annular channels are provided so that sufficient annular channels are provided correspondingly for the lifting straps.

For example, in the aforementioned embodiment, the lifting control mechanism 6 includes a take-up pulley 65, and the take-up pulley 65 has two annular grooves 651 and 652 for the two lifting straps 5 to be respectively disposed correspondingly. However, on the premise that the number of lifting straps is two, the lifting control mechanism can also be configured to include two take-up pulleys each having an annular channel. This can also provide a total of two annular channels for the two lifting straps. The bands correspond to the settings respectively. In addition, if the number of lifting straps is greater than two, the total number of annular channels of the lifting control mechanism can be expanded by increasing the number of take-up pulleys or opening more annular grooves on a single take-up pulley. Make it sufficient for the corresponding setting of the lifting ropes. The following will be described in detail with reference to multiple embodiments.

Please refer to FIG. 11 , which shows another implementation aspect of the lifting control mechanism in this embodiment. As shown in the figure, the lifting control mechanism 68 includes two take-up pulleys 685 and 686 in addition to the base 681, the driving wheel 682, the spring storage wheel 683, and the scroll spring 684. The two pulleys 685 and 686 are connected to each other in an interlocking manner by the gear plates below the wheel bodies meshing with each other. The take-up pulley 685 is connected to the driving wheel 682 and can drive the driving wheel 682 or be driven by the driving wheel 682 . The reel pulley The wheel body of the pulley 685 is provided with an annular channel 6851, and the pulley 686 is also provided with an annular channel 6861. The two lifting straps 5 are respectively wound on the two annular grooves 6851 and 6861 of the two winding pulleys 685 and 686 in opposite directions. When the two pulleys 685 and 686 rotate synchronously in opposite directions, the two lifting straps 5 are retracted by the two pulleys 685 and 686 at the same time, or are released by the two pulleys 685 and 686 at the same time.

See Figure 12 to Figure 14. In the second embodiment of the invention, the Venetian blind 200 includes an upper beam 10, a lower beam 20, four ladder ropes 30, a plurality of blades 40, four lifting straps 50, a lifting control mechanism 60 and four steering wheels. Device 70. In this embodiment, the lifting control mechanism 60 and the steering devices 70 are disposed in the lower beam 20 , and each blade 40 has a first through hole 410 , a second through hole 420 , a third through hole 430 and a fourth through hole 430 . The through holes 440 are arranged and distributed on each blade 40 along the extending direction of the longitudinal long side of each blade 40 . The lifting control mechanism 60 includes the base 601, the driving wheel 602, the spring storage wheel 603, the scroll spring 604, two take-up pulleys 605 and 606, and a plurality of guide rollers 607. The take-up pulley 605 has two annular grooves 6051 and 6052, and the take-up pulley 606 also has two annular grooves 6061 and 6062. Therefore, the lifting control mechanism 60 includes a total of four annular grooves 6051, 6052, 6061 and 6062, which are sufficient for the upper ends of the four lifting straps 50 to be respectively fixed and wound around them.

In addition, the guide rollers 607 are respectively arranged adjacent to the two winding pulleys 605 and 606. Each guide roller 607 has three discs arranged at intervals along the first axis A1, so that adjacent ones of the discs A first channel 6071 and a second channel 6072 are formed between them. One of the four lifting straps 50 is fixed and wound on the annular channel 6051 of the take-up wheel 605. After extending from the annular channel 6051 of the take-up wheel 605, it bypasses the adjacent take-up wheel 605. The two guide rollers 607 of the The first channel 6071 changes its extension direction, and after extending to the corresponding steering device 70 , it changes its extension direction again and extends to and through the third through holes 430 of the blades 40 . One of the four lifting straps 50 is fixed and wound on the annular channel 6052 of the take-up wheel 605. After extending from the annular channel 6052 of the take-up wheel 605, it bypasses the adjacent take-up wheel 605. The two second grooves 6072 of the two guide rollers 607 change the extension direction, and after extending to the corresponding steering device 70 , change the extension direction again and extend to and through the fourth through holes of the blades 40 440.

Similarly, one of the four lifting straps 50 that is fixed and wound on the annular channel 6061 of the take-up wheel 606 extends from the annular channel 6061 of the take-up wheel 606 and then goes around the adjacent reel. The two first grooves 6071 of the two guide rollers 607 of the pulley 606 change the extension direction, and after extending to the corresponding steering device 70 , change the extension direction again and extend to and through the blades 40 Second perforation 420. One of the four lifting straps 50 is fixed and wound on the annular channel 6062 of the take-up wheel 606. After extending from the annular channel 6062 of the take-up wheel 606, it bypasses the adjacent take-up wheel 606. The two second grooves 6072 of the two guide rollers 607 change the extension direction, and after extending to the corresponding steering device 70 , change the extension direction again and extend to and through the first through holes of the blades 40 410.

Please refer back to Figure 4. The upper beam 1 of the Venetian blind 100 further includes a light transmission adjustment mechanism 11. The light transmission adjustment mechanism 11 includes a rotating shaft 111, two light transmission adjustment wheel bodies 112 corresponding to the number of ladder ropes 3. A transmission device 113 and an operating lever 114. The two light-transmitting adjusting wheel bodies 112 are fixedly sleeved on the rotating shaft 111 , and the upper ends of the two ladder ropes 3 are respectively disposed corresponding to the two light-transmitting adjusting wheel bodies 112 . More specifically, the upper ends of the warps 31 and 32 of each ladder rope 3 are fixed on the corresponding light-transmitting adjusting wheel body 112 . When the user rotates the operating lever 114, the transmission device 113 drives the rotating shaft 111 to rotate. Then, the two light-transmitting adjustment wheels 112 are driven to rotate, causing one of the two warps 31 and 32 of each ladder rope 3 to move upward and the other to move downward. As the two warps 31 and 32 are displaced up and down, the supports 33 of each ladder rope 3 drive the blades 4 between a horizontal position (shown in Figure 1) and a closed position (shown in Figure 2) Flip.

It is worth noting that in this embodiment, each lifting strap 5 is a thin strip and its narrow side NS is narrower than the diameter of the warp 31 or 32, which is preferably smaller than that used for hanging in the conventional technology. The wire diameter of the rope of the lower beam 2, so when the blades 4 are flipped to the closed position, is matched with the elongated opening range of the first through hole 41 and the second through hole 42 of each blade 4, so that the placement of each blade 4 The angle is less susceptible to interference by the lifting strap 5 and can be closer to the first axial direction A1, and a smaller gap can be formed between each adjacent pair of blades 4 to achieve better closeness. And improve the shading effect. In addition, when each lifting strap 5 is inserted into the first through hole 41 and the second through hole 42, its wide side BS is substantially parallel to the longitudinal long side of each blade 4, and both sides of the wide side BS are respectively distanced from the first through hole 41. And the inner edge of the perforation 42 is about 0.5 mm. Because the width of the short side SS of the first through hole 41 and the second through hole 42 of each blade 4 is only slightly wider than the width of the wide side BS of the lifting strap 5, it also presents a regular rectangle, which is different from the conventional oblong shape. When the opening angle of each blade 4 is closest to the first axial direction A1, the gap between the elongated hole and the lifting strap 5 is very small, which also helps to improve the shading effect.

As can be seen from the above embodiments, the lifting control mechanism of the blinds of the present invention can be arranged on the upper beam or the lower beam, and the steering device will be arranged on the upper beam or the lower beam where the lifting control mechanism is located. The function of the steering device of the blinds of this invention is to change the extension direction of the lift strap extending from the lift control mechanism, so that it extends from the horizontal direction to extends along the first axis A1 and passes through the blades. . At the same time, the steering device can provide appropriate resistance to the lifting strap when it moves. Each steering device includes a first arc-shaped element, a base and a second arc-shaped element, the first arc-shaped element has at least one arc surface, the second arc-shaped element includes at least one arc-shaped member, and the arc-shaped member is configured on this base. The following will illustrate the implementation of multiple steering devices with diagrams.

Please refer to FIG. 4 and FIGS. 15 to 17 . Taking the steering device 7 on the right side in FIG. 4 as an example, the steering device 7 includes a first arc-shaped component 71 , a base 72 and a second arc-shaped component 73 . In this embodiment, the first arc-shaped component 71 is a thin shell 711 that is 1/4 circular and extends along the first axis A1. It has an arc surface on the outside and a rib 712 protruding from the inside. are fixed on the base 72. The bottom surface of the base 72 is provided with a belt outlet hole 721 and two cable outlet holes 722 and 723 penetrating through the bottom plate of the base 72 . The second arc member 73 includes an arc member. In this embodiment, the arc member is a positioning roller 731 that can rotate around a second axis A2 parallel to the extension direction E of the upper beam 1 .

Please refer to FIG. 16 and FIG. 18 at the same time. The positioning roller 731 has two protrusions 7311 located at both axial ends and a recessed portion 7312 located between the two protrusions 7311 . When each lifting strap 5 bypasses the positioning roller 731, it will be restricted by the two convex walls 7311 in the recessed portion 7312.

Please also refer to Figure 4, Figure 15 and Figure 16. The lifting strap 5 extends from the lifting control mechanism 6 to the steering device 7 on the right in Figure 4 , then bypasses the arc surface on the outside of the thin shell 711 of the first arc-shaped element 71 , and extends along a transmission direction TD to and bypass the positioning roller 731 of the second arc-shaped element 73 . Thereafter, the lifting strap 5 passes through the strap exit hole 721 of the base 72 and extends toward the second through holes 42 of the blades 4 . In this embodiment, the two light-transmitting adjustment wheel bodies 112 of the light-transmitting adjustment mechanism 11 are respectively disposed in the bases 72 of the two steering devices 7, and the upper ends of the warps 31 and 32 of each ladder rope 3 are formed by After the light-transmitting adjusting wheel body 112 is extended, it passes through the two outlet holes 722 and 723 on the bottom surface of the base 72 respectively.

In this embodiment, in order to prevent the lifting straps 5 from contacting and cutting the warps 31 and 32 of the ladder ropes 3, the positions where the lifting straps 5 and the ladder ropes 3 pass through the upper beam 1 are designed. are staggered from each other in this direction E. More specifically, the belt outlet hole 721 opened on the bottom surface of the base 72 of each steering device 7 is staggered from the cable outlet holes 722 and 723, and the belt outlet hole 721 and the cable outlet holes 722 and 723 respectively limit the lifting and pulling. The warp threads 31 and 32 of the belt 5 and the ladder rope 3 pass through the position of the upper beam 1.

Please refer to Figure 1 and Figure 19. One side of the upper beam 1 defines a lateral reference plane LP. The position where the longitudes 31 and 32 of the ladder rope 3 on the right side in Figure 1 pass out from the bottom surface of the upper beam 1 (marked by dots) are separated from the lateral reference plane LP by a first distance D1; the left side in Figure 1 The position where the longitudes 31 and 32 of the square ladder rope 3 pass through the bottom surface of the upper beam 1 (marked by dots) are separated from the lateral reference plane LP by a second distance D2; the lifting on the right side in Figure 1 The position where the strap 5 passes through the bottom surface of the upper beam 1 (marked by a dot) is separated from the lateral reference plane LP by a third distance D3; the lifting strap 5 on the left side in Figure 1 extends from the bottom surface of the upper beam 1 The penetration position (marked by a dot) is separated from the lateral reference plane LP by a fourth distance D4. Wherein, the first distance D1, the second distance D2, the third distance D3 and the fourth distance D4 are all different, thereby realizing that each lifting strap 5 and each ladder rope 3 can be passed through the upper beam 1 The positions are configured to be staggered from each other in the direction E.

Please refer back to Figures 12 and 13. In the second embodiment of the present invention, the light transmission adjustment mechanism 110 further includes four fixing seats 1121, and the number of the four light transmission adjustment wheel bodies 1120 corresponds to the ladder rope 30 respectively. Correspondingly arranged in the four fixed seats 1121. After the upper ends of the warps 310 and 320 of each ladder rope 30 extend from the light-transmitting adjusting wheel body 1120, they pass through two outlet holes (not shown) opened on the bottom surface of the fixed base 1121, and the The two cable outlet holes are staggered in the direction E′ in which the upper beam 10 extends from the cable outlet hole 716 opened in the base 710 of the four-steering device 70 . With this configuration, it is also This can prevent the lifting strap 50 from contacting and cutting the warps 310 and 320 of the ladder rope 30 .

In addition, when the user unfolds the blinds of this invention to half and stops applying force, the elastic force provided by the scroll spring in the lifting control mechanism, as well as the downward pulling force generated by the weight of the lower beam and the blades stacked on it, The difference between the two creates a net upward or downward force. At this time, the blind mechanism needs to provide a certain static friction resistance to the lifting strap to resist this net force, so that the lower beam can stop at any required position. However, due to factors such as width, material or shape, venetian blind products of different specifications have different weights of the lower beams and blades, and the required static friction resistance values are also different. In this case, there is a need for a steering device that can provide adjustable resistance to the lifting strap, and can be used as a modular part for venetian blind products of different specifications.

Please refer to Figures 20 to 23, which show another embodiment of the turning device of the venetian blind of the present invention. As shown in the figure, the turning device 8 includes a first arc-shaped element 81, a base 82 and a second Arc element 83. In this embodiment, the first arc-shaped element 81 is a pair of rollers 811 and 812. Each of the two rollers 811 and 812 can rotate around the first axis A1 and has an arc surface. The bottom surface of the base 82 is provided with a belt outlet hole 821 and two cable outlet holes 822 and 823 penetrating the bottom plate of the base 82 . At the same time, a first mounting part 824 , a second mounting part 825 and a third mounting part 826 are provided on one side of the base 82 between the first mounting part 824 and the second mounting part 825 . The second arc-shaped component 83 includes an arc-shaped member, and the arc-shaped member is a positioning roller 831, the structure of which is the same as the positioning roller 731 shown in FIG. 18 .

It is worth noting that the positioning roller 831 can be selectively installed at a first position P1 (shown in FIG. 24 ) or a second position P2 on the base 82 , thereby providing different resistances to the lifting strap 5 . Among them, the first position P1 is closer to the first arc-shaped element 81 than the second position P2. when When the positioning roller 831 is disposed on the first mounting part 824, it is located at the first position P1. When the positioning roller 831 is disposed on the second mounting part 825, it is located at the second position P2. In addition, when the positioning roller 831 is installed at the second position P2, the second arc-shaped component 83 further includes an auxiliary component for use with the positioning roller 831 installed at the second position P2. The auxiliary component may be an auxiliary roller, a metal shaft, or an arc-shaped structure integrally formed with the base 82 .

The steering device 8 shown in FIGS. 20 to 23 is configured such that the positioning roller 831 is installed at the second position P2, and the second arc-shaped component 83 further includes an auxiliary component. In this embodiment, the auxiliary component is an auxiliary roller 832 provided on the third mounting portion 826 of the base 82 . After the lifting belt 5 extends to the steering device 8 configured in this way and sequentially bypasses the two rollers 811 and 812 of the first arc-shaped element 81 , it then sequentially bypasses the positioning roller along a second predetermined bending path T2 831 and the auxiliary roller 832, and then pass through the belt outlet hole 821.

Please refer to Figure 24, which shows another configuration of the steering device in Figure 21. As shown in the figure, the positioning roller 831' of the steering device 8' is installed at the first position P1. After the lifting belt 5 extends to the steering device 8' configured in this way and sequentially bypasses the two rollers 811 and 812 of the first arc-shaped element 81, it then bypasses the positioning roller 831 along a first predetermined bending path T1. 'And directly pass through the belt outlet hole 821. In this configuration, the lifting strap 5 passes around fewer elements and bends less in the steering device 8', so it encounters less resistance. In other words, the steering device 8' in this configuration will provide less resistance to the lifting strap 5 than the steering device 8 in the configuration shown in Figure 21.

In addition, the steering device in Figure 21 can also optionally provide a positioning roller on each of the first mounting part 824 and the second mounting part 825, and an auxiliary roller on the third mounting part 826, so that the lifting straps can be lifted in sequence. Bypass the two positioning rollers and the auxiliary roller, and then pass through the tape outlet hole 821. In this configuration, the lifting strap 5 bypasses many components and bends more, so it experiences greater resistance. In other words, the steering device in this configuration will provide greater resistance to the lifting strap 5 than the steering device 8 in the configuration shown in FIG. 21 .

Please refer to Figure 25, which shows another embodiment of the steering device of the blinds of the present invention. As shown in the figure, the first arc-shaped element 91 of the steering device 9 is a pair of rollers 911, 912, and there are openings on the base 92. There is a belt outlet hole 921 and two cable outlet holes 922 and 923 that penetrate through the bottom plate of the base 92. The second arc-shaped component 93 includes two arc-shaped parts and an auxiliary part, wherein the two arc-shaped parts are two positioning rollers. 931, 932, its structure is the same as the positioning roller 731 shown in Figure 18. The auxiliary component of the steering device 9 in this embodiment is an arc structure 933 , which is integrally formed with the base 92 and is located on the side of the tape exit hole 921 away from the first arc-shaped component 91 . After extending to the steering device 9 and sequentially bypassing the two rollers 911 and 912 of the first arc-shaped element 91 , the lifting belt 5 then sequentially bypasses the two positioning rollers 931 and 931 along a third predetermined bending path T3 . 932 and the arc structure 933, and then pass through the belt exit hole 921.

It can be seen from the above that the steering device 8, 8' of the embodiment can selectively install the arc-shaped parts of the second arc-shaped components 83, 83', that is, the positioning rollers 831, 831', on the base 82 in different ways. position, and optional auxiliary parts are used to change the resistance value provided to the lifting strap 5 without changing the hardware as much as possible to meet the design needs of blind products of different specifications.

In addition, compared with the drum structure, the non-rotatable metal shaft can provide greater resistance to the lifting strap when the lifting strap wraps around its outer circumference. Any one of the first arc-shaped element, the arc-shaped component and the auxiliary component of the second arc-shaped component of the blind turning device of the present invention can be a metal shaft. By selectively using rollers or metal shafts as the above elements, the steering device can be adjusted to The amount of resistance provided by the lift strap.

Please refer to Figure 26, which shows another embodiment of the steering device of the blinds of the present invention. As shown in the figure, the first arc-shaped element 901 of the steering device 90 is a pair of metal shafts 9011, 9012, and the base 902 There is a hole 9021 on the bottom surface that penetrates through the bottom plate of the base 902 . The second arc member 903 includes an arc member and an auxiliary member, wherein the arc member is a first metal shaft 9031, and the auxiliary member of the steering device 90 in this embodiment is a second metal shaft 9032. After the lifting strap extends to the steering device 90 and sequentially bypasses the two metal shafts 9011 and 9012 of the first arc-shaped component 901, it sequentially bypasses the first metal shaft 9031 and the second metal shaft 9032, and then Pass through the belt outlet hole 9021. The steering device 90 in this embodiment provides resistance to lifting the pull belt 5, which is far greater than the resistance provided by the steering devices 8, 8', and 9 in the aforementioned embodiments to lift the pull belt 5.

To sum up, the blinds 100 and 200 of the present invention use a plurality of thin strips as lifting straps 5 and 50 to suspend the lower beams 2 and 20, and enable each lifting strap 5 and 50 to be lifted during the winding process. Neatly stacked in the lifting control mechanisms 6, 60, 68, it can ensure that the lower beams 2, 20 are maintained in a horizontal state without being skewed during the closing process of the venetian blinds 100, 200. At the same time, when the blinds 100 and 200 are in a closed state, the lifting straps 5 and 50 can form a smaller gap between the blades 4 and 40 to achieve a better shading effect. In addition, by adjusting the first arc member, the arc member and the auxiliary member in the second arc member of the steering device 7, 70, 8, 8', 9 or 90, the lifting straps 5, 50 can be adjusted. Provides adjustable resistance value to match different specifications of Venetian blind products.

The above are only examples of this invention, and any equivalent changes made by applying the description and patent scope of this invention should be included in the patent scope of this invention.

100: Venetian blinds

1: Top beam

2:Xia Liang

4: Blades

41: First piercing

42: Second piercing

5: Lifting strap

6:Lifting control mechanism

6a: Cover plate

Claims (20)

A kind of blind, including: an upper beam; a lower beam, located below the upper beam, extending in the same direction as the upper beam, and defining a first axis that is generally perpendicular to the extension direction; at least two ladder ropes, each The two ends of the ladder rope are respectively connected to the upper beam and the lower beam, and each ladder rope includes two warps and a plurality of supports located between the two warps; a plurality of blades are respectively supported on the The support members of the ladder rope are arranged between the upper beam and the lower beam. Each blade has a first through hole and a second through hole; at least two lifting straps, each of which is a lifting strap. A thin strip has a wide side and a narrow side, one of the two lifting straps passes through the first through holes of the blades and the other passes through the second through holes of the blades, and One end of the lifting straps is connected to one of the upper beam and the lower beam; and a lifting control mechanism is provided in the upper beam and the lower beam to connect the other end of the lifting straps, It includes: a driving wheel; a scroll spring, one end of which is connected to the driving wheel, and the scroll spring is wound around or released from the driving wheel according to the rotation direction of the driving wheel; and at least one pulley, connected to the driving wheel. The driving wheel is arranged parallel to the driving wheel, wherein when one of the driving wheel and the take-up pulley rotates, the other will be driven to rotate synchronously; the take-up pulley has at least one annular channel, and is connected to the lifting control mechanism The number of the annular channels is configured to be at least two or more, which is enough for the lifting straps to be arranged correspondingly, and the width of each annular channel along the first axis corresponds to the wide side of each lifting strap, Each lifting strap is wound around or released from each annular channel, and each turn of each lifting strap is generally aligned and stacked on top of another turn; Wherein, when the lower beam is moved away from the upper beam so that the plurality of blades are gradually unfolded, the two lifting straps are released from the take-up pulley as the lower beam moves and drive the take-up pulley toward a first direction rotation, thereby driving the driving wheel to rotate forward, causing the scroll spring to be wound on the driving wheel and accumulate an elastic force. When the lower beam is moved toward the direction of the upper beam, the plurality of blades are gradually folded , the scroll spring releases the elastic force due to the movement of the lower beam and is released from the driving wheel, driving the driving wheel to rotate in the opposite direction, and then driving the take-up wheel to rotate in a second direction opposite to the first direction and Roll up the two lifting straps. The blind as claimed in claim 1, wherein the lifting control mechanism is provided on the upper beam. The venetian blind as claimed in claim 1, wherein the width of each annular channel along the first axial direction is greater than the length of the wide side of the lifting strap and less than 2 times the length of the wide side of the lifting strap. . The blind as claimed in claim 1, wherein the narrow side of each lift strap is narrower than the diameter of each warp. The venetian blind as claimed in claim 1, wherein the first perforation and the second perforation are respectively an elongated hole opened on each blade along the extending direction of a transverse short side of each blade, and the elongated hole is The length of a short side of the hole corresponds to the wide side of each lifting strap to accommodate each lifting strap passing through the elongated hole, and the wide sides of each lifting strap passing through the elongated hole are approximately parallel. in the extending direction of one longitudinal side of each blade. The blind as claimed in claim 5, wherein the length of the short side of the elongated hole is slightly longer than the length of the wide side of the lifting strap. The blind as claimed in claim 1, wherein the number of the winding pulleys of the lifting control mechanism is at least two, the at least two winding pulleys can be interconnectedly connected to each other, and each of the winding pulleys is respectively Has an annular channel. The blind as claimed in claim 1, wherein the lifting control mechanism has one take-up pulley, and the take-up pulley has at least two annular grooves. The blind as described in claim 1, wherein the number of lift straps of the blind is four, the number of pulleys of the lift control mechanism is two, each pulley has two annular channels, and each of the pulleys has two annular channels. The blade further includes a third through hole and a fourth through hole; wherein, the two pulleys can be interconnected with each other, and the four lifting straps are respectively wound around or released from the four annular channels of the two pulleys. , and the four lifting straps pass through the first through holes, the second through holes, the third through holes and the fourth through holes of the blades respectively. The blind as claimed in claim 1, wherein the lifting control mechanism further includes a guide roller disposed adjacent to the take-up pulley, and the guide roller has three disks disposed at intervals along the first axial direction to adjust the position of the guide roller at intervals along the first axial direction. A first channel and a second channel are formed between adjacent two disc-shaped objects. After the two lifting straps extend from the at least one pulley, one of them correspondingly bypasses the guide. The first channel of the roller changes the extension direction, and the other one correspondingly bypasses the second channel of the guide roller to change the extension direction. The blind as claimed in claim 1, further comprising at least two steering devices provided with one of the lifting control mechanisms in the upper beam and the lower beam, and each of the steering devices includes: a first arc-shaped element having At least one arc surface; a base; and a second arc-shaped component, including at least one arc-shaped member provided on the base; wherein, after the two lifting straps extend from the lifting control mechanism, they respectively bypass the two steering devices The two arc surfaces of the two first arc-shaped elements each extend along a transmission direction to and bypass the corresponding second arc-shaped element of the steering device, and then the upper beam and the lower beam are provided with the One of the lifting control mechanisms passes through, and then the two lifting straps extend toward the first through holes and the second through holes of the blades respectively. The blind as claimed in claim 11, wherein the arc-shaped member of the second arc-shaped element of each steering device is selectively installed at one of a first position and a second position on the base, The distance from the first arc-shaped element to the first position along the transmission direction is less than the distance from the first arc-shaped element to the second position along the transmission direction; when the arc-shaped component is installed at the first position, each of the After the lifting belt bypasses the arc surface of the first arc-shaped element of the corresponding steering device, it bypasses the arc-shaped component and is passed through one of the upper beam and the lower beam that is provided with the lifting control mechanism. out; when the arc-shaped member is installed in the second position, the second arc-shaped element further includes an auxiliary member to match the arc-shaped member installed in the second position, and each lifting strap is bypassing the corresponding After the arc surface of the first arc-shaped element of the steering device, it sequentially bypasses the arc-shaped component and the auxiliary component, and then passes through one of the upper beam and the lower beam equipped with the lifting control mechanism; The auxiliary component is an auxiliary roller, a metal shaft or an arc-shaped structure integrally formed with the base. The blind as claimed in claim 11, wherein the second arc-shaped element of each steering device further includes an auxiliary member located on the base, and each lift strap bypasses the first first portion of the corresponding steering device. After the arc surface of the arc-shaped component, it goes around the arc-shaped component and the auxiliary component in sequence, and then passes through one of the upper beam and the lower beam that is equipped with the lifting control mechanism; the auxiliary component is an auxiliary roller. , a metal shaft or an arc-shaped structure integrally formed with the base. The blind as claimed in claim 11, wherein the second arc-shaped element of each steering device includes two arc-shaped members and an auxiliary member located on the base, and the two arc-shaped members are respectively installed on the base. a first arc-shaped member and a second arc-shaped member at a first position and a second position, the distance from the first arc-shaped element to the first position along the transmission direction is smaller than the first arc-shaped element The distance from the transmission direction to the second position; when each lifting strap bypasses the opposite After the arc surface of the first arc-shaped element of the corresponding steering device, it selectively extends along one of a plurality of predetermined bending paths, and then one of the lifting control mechanisms is provided in the upper beam and the lower beam. Passing out; wherein one of the predetermined bending paths is to bypass the first arc-shaped component, and the other of the predetermined bending paths is to bypass the second arc-shaped component and the auxiliary component in sequence, Another one of the predetermined bending paths is to sequentially bypass the first arc-shaped member, the second arc-shaped member and the auxiliary member, whereby each second arc-shaped element changes the lifting strap. While extending in the direction, it provides adjustable resistance to each lifting strap; the auxiliary component is an auxiliary roller, a metal shaft or an arc-shaped structure integrally formed with the base. The blind as described in any one of claims 11 to 14, wherein each arc-shaped member is a positioning roller, and the positioning roller can rotate around a second axis parallel to the extension direction of the upper beam, and the Each axial end of the positioning roller has a convex wall, and the positioning roller has a recessed portion between the two convex walls, so that each lifting strap can bypass the second arc-shaped element of the corresponding steering device. When the positioning roller is moved, it is restricted in the recessed portion by the two convex walls. The blind as claimed in claim 11, wherein the first arc-shaped element of each steering device is a thin shell that is 1/4 circular and extends along the first axial direction, and the outer side of the thin shell is With the arc surface, a rib protrudes from the inner side of the thin shell, and the rib is engaged with the base. The blind as claimed in claim 11, wherein the first arc-shaped element of each steering device is a pair of rollers, each of the rollers can rotate around the first axis and has an arc surface, and each of the lift straps After extending from the lifting control mechanism, it sequentially bypasses the two arc surfaces of the two rollers of the corresponding steering device. The blind as claimed in claim 1, wherein the lifting control mechanism further includes a resistance mechanism, the resistance mechanism is operatively connected to the take-up pulley, so as to control the take-up pulley when the take-up pulley rotates in the first direction. The rotation of the pulley provides resistance. The blind as claimed in claim 18, wherein the resistance mechanism is a one-way resistance mechanism that only provides resistance to the rotation of the take-up wheel when the take-up wheel rotates in the first direction, and when the take-up wheel rotates in the first direction, the resistance mechanism is a one-way resistance mechanism. The pulley does not provide resistance to the rotation of the take-up pulley when the pulley rotates in the second direction. The blind as claimed in claim 1, wherein the upper beam further includes a light transmission adjustment mechanism, which can control the up and down misalignment of the two warps of each ladder rope to drive the blades to a horizontal position. flip between The datum plane is separated by a first distance; the position where the two longitudes of the other of the two ladder ropes pass through the bottom surface of the upper beam is separated by a second distance from the lateral datum plane; one of the two lifting straps The position where one of the two lifting straps penetrates from the bottom surface of the upper beam is spaced a third distance from the lateral datum plane; the position where the other of the two lifting straps penetrates from the bottom surface of the upper beam is spaced a third distance from the lateral datum plane. A fourth distance; wherein the first distance, the second distance, the third distance and the fourth distance are all substantially different.

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