Winding and overturning method for shutter

Abstract

When blades need to be unfolded and turned over, the method comprises the following steps that S11, a driving piece drives a prism to rotate forwards, the prism drives a blade turning wheel and a winding reel to rotate forwards synchronously, a lifting line is unwound from the winding reel to achieve release of the lifting line, the blades fall down under the traction of the gravity of the blades in the release process of the lifting line, and the blades are driven by the prism to rotate forwards; at the moment, the overturning belt is just in a tensioning state under the gravity action of the blades; and S12, the driving part continues to drive the prism to rotate forwards, so that the impeller turning wheel rotates forwards, the turning belt is driven to rotate clockwise through friction force, and the turning belt drives the blades to turn over. The blade overturning device has the advantages that the blade overturning wheel and the winding reel rotate synchronously, movement of the lifting line and the overturning belt can be achieved only through one driving piece, and therefore overturning, winding and unwinding of the blades are achieved, and operation is convenient.

Description

Technical Field

[0001] This invention relates to the field of venetian blinds, specifically a method for rolling up and flipping venetian blinds. Background Technology

[0002] Venetian blinds are common furniture items. The structure of a Venetian blind includes slats, a cord winder, a lifting cord wound around the cord winder, a tilting impeller, and a rotating belt wound around the tilting impeller. The lifting cord connects to the slats below; the slats are retracted by winding the lifting cord around the cord winder, and unfolded by unwinding the lifting cord around the cord winder. The tilting belt is wound around the tilting impeller to tilt the slats. The cord winder and the tilting impeller are driven by different components, requiring two separate operations to retract and tilt the slats, which is extremely inconvenient.

[0003] Therefore, it is necessary to provide a method for retracting and flipping venetian blinds. Summary of the Invention

[0004] The present invention provides a method for retracting and flipping venetian blinds, which effectively solves the problem of inconvenient retracting of venetian blinds.

[0005] The technical solution adopted in this invention is: A method for retracting and flipping Venetian blinds. When the blades need to be unfolded and flipped, the following steps are included: S11. The driving component drives the prism to rotate forward, and the prism drives the flipping wheel and the winding drum to rotate forward synchronously, so that the lifting line is unwound from the winding drum to release the lifting line. During the release process, the blades fall under their own gravity until all the blades are unfolded. At this time, the flipping belt is just in a taut state under the action of the blades' gravity. S12. The driving component continues to drive the prism to rotate clockwise, causing the impeller to rotate clockwise and use friction to drive the rotating belt to rotate clockwise, causing the rotating belt to drive the blades to rotate. When it is necessary to retract the unfolded blades, the following steps are included: S21. The driving component drives the prism to reverse, which in turn drives the winding drum and the impeller to reverse. The reverse rotation of the impeller drives the counterclockwise transmission of the rotating belt, causing all blades to change from the flipped state to the flat state. At this time, the lifting line is just in the tensioned state, and the rotating belt is about to be in the slack state. S22. The prism continues to reverse, driving the lifting line to wind in the winding drum. During the winding process, the lifting line drives the bottommost blade to rise, causing several blades to gather under the profile support. When it is necessary to fold up the leaves that are laid flat, the following steps are involved: S31, the driving component drives the prism to reverse, the prism drives the winding drum and the impeller to reverse, the impeller reverses so that the turning belt is in a slack state, the winding drum reverses so that the lifting line is wound in the winding drum, during the winding process the lifting line drives the bottom blade to rise upward, so that several blades are gathered under the profile support.

[0006] Furthermore, the impeller and the winding drum are coaxially provided with prismatic holes that mate with the prism. The profile support is provided with an impeller winding and rope assembly, which includes a winding drum, an impeller, and a shaft frame for mounting the winding drum. The drive unit is installed in the profile support and is coaxially and fixedly connected to the prism. When the blades unfold, the two ends of the flipping belt extend from the two tangential directions of the impeller and connect with several blades. One end of the lifting line is fixed to the winding drum, and the other end of the lifting line is fixedly connected to the bottommost blade.

[0007] Furthermore, the impeller is provided with an annular groove with a V-shaped cross section, and the flipping belt includes a rope body that contacts the impeller roller through the annular groove and several connecting ropes. The rope body includes an arc segment that contacts the impeller and two drooping segments that are connected to the two ends of the arc segment. The arc segment contacts the impeller through the annular groove.

[0008] Furthermore, when the flipping belt is in a taut state, the forward rotation of the impeller drives the flipping belt to move through the friction between the arc segment and the annular groove, causing one of the drooping sections to rise and the other drooping section to fall, thereby tilting the connecting rope and using the connecting rope to support the lower end face of the blade to achieve the flipping of the blade.

[0009] Furthermore, the shaft frame includes a base, an arc-shaped wheel cover, and two sets of rollers. The base has two mounting slots (number one) for mounting the two winding drums and a mounting slot (number two) for mounting the impeller. The impeller is located below the arc-shaped wheel cover. The base has two wire-passing holes located on both sides of the impeller. The two sets of rollers are centrally symmetrically arranged in the wire-passing holes along the impeller. Each set of rollers includes a number one shaft and a number two shaft that are horizontally perpendicular to the prism. The number one shaft is located diagonally above the number two shaft. The lifting wire contacts the roller surfaces of the number one and number two shafts. The shaft frame also includes two ball bearings. The number one mounting slot has a support surface that abuts against the outer ring of the ball bearing, and the inner ring of the ball bearing abuts against the number one end cap.

[0010] Furthermore, when the blade is retracted from the unfolded state, the flipping belt changes from a tensioned state to a relaxed state. In the relaxed state, the flipping belt will move upward relative to the annular groove. At this time, the upper end of the arc segment is limited by the arc-shaped wheel cover.

[0011] Furthermore, the blades include a lower beam at the bottom and several wooden pieces above the lower beam. The lower beam has a horizontal through hole, and the rope body is a loop that passes through the horizontal through hole. Two lifting lines are fixedly connected to both sides of the lower beam. When the blades are unfolded, the lifting lines are released from the winding drum and are taut under the gravity of the lower beam.

[0012] Furthermore, the profile support includes a bottom wall, side walls symmetrically arranged on both sides of the bottom wall, and two baffles respectively connecting the two ends of the bottom wall and the side walls. A protrusion is provided on the opposite side of the side wall, and the shaft frame is provided with a step that cooperates with the protrusion.

[0013] Furthermore, the prism is also provided with a limiting component, which includes a screw with a prism-shaped hole, a limiting head fixedly disposed on the outside of one end of the screw, a bolt, and a brake pad threadedly connected to the screw. The limiting head is vertically provided with a threaded hole threadedly connected to the bolt, and the brake pad moves along the axial direction of the screw by rotating the screw.

[0014] Furthermore, after the bolt is threaded into the screw hole, it abuts against the prism to fix the limiting component. When it is necessary to move the limiting component, loosen the bolt, move the screw along the prism axis, and then tighten the bolt again.

[0015] Beneficial effects of the invention: 1. The impeller and the winding drum rotate synchronously, and the movement of the lifting line and the turning belt can be realized by a single drive component, thereby realizing the turning and winding of the blades, which is convenient for operation.

[0016] 2. Limit the rotation of the winding drum by using a limiting component to prevent the winding drum from continuing to rotate after unwinding the lifting line, which would cause the lifting line to rewind.

[0017] 3. The first and second shafts enable a rolling connection with the lifting line, reducing the friction of the lifting line during take-up and take-down.

[0018] 4. The rotating belt enables all blades to rotate synchronously, ensuring the rotation effect. At the same time, the impeller is equipped with an annular groove, and the shaft frame is equipped with an arc-shaped wheel cover to prevent the rotating belt from falling off the impeller. Attached Figure Description

[0019] Figure 1 This is an overall schematic diagram of the venetian blinds for the venetian blinds retraction and flipping method provided in the embodiments of this application.

[0020] Figure 2 This is a schematic diagram of the venetian blind rewinding and flipping method provided in the embodiments of this application, after omitting the flipping belt, lifting line, and blades.

[0021] Figure 3 Figure 2 An enlarged schematic diagram of region A in the middle.

[0022] Figure 4 This is a schematic diagram showing the cooperation between the leaf-turning rope assembly and the leaf blades in the venetian blind rewinding and flipping method provided in the embodiments of this application.

[0023] Figure 5 An exploded view of the flap rewinding and flipping method provided in the embodiments of this application when the flap rewinding and flipping rope assembly and the flaps are engaged.

[0024] Figure 6 This is a schematic diagram of the prism and limiting component in the venetian blind rewinding and flipping method provided in the embodiments of this application.

[0025] Figure 7 This is a schematic diagram of the flap wheel, flap belt, and blades in the louver rewinding and flipping method provided in the embodiments of this application.

[0026] Figure 8 This is a side view of the louvers in the louver roll-up and flipping method provided in the embodiments of this application, showing the louvers unfolded but not flipped.

[0027] Figure 9 A side view of the louvers unfolded and flipped in the louver roll-up and flipping method provided in the embodiments of this application.

[0028] The components in the diagram are labeled as follows: 1. Profile bracket; 2. Flip-turning rope winding assembly; 3. Prism; 4. Drive component; 5. Blade; 21. Shaft bracket; 22. Winding drum; 23. Lifting line; 24. Flip-turning wheel; 25. Tilting belt; 240. Annular groove; 251. Arc segment; 252. Drooping segment; 253. Connecting rope; 51. Wood chip; 52. Lower beam; 221. Cylinder body; 222. End cap No. 1; 223. End cap No. 2; 201. Cable harness hole; 202. Winding groove; 6. Limiting assembly; 61. Screw; 62. Limiting head; 63. Brake pad; 211. Base; 212. Arc-shaped wheel cover; 213. Shaft No. 1; 214. Shaft No. 2; 215. Ball bearing; 11. Bottom wall; 12. Side wall; 13. Baffle; 14. Protrusion; 601. Screw hole. Detailed Implementation

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] A method for retracting and flipping venetian blinds, when the slats 5 need to be unfolded and flipped, includes the following steps: S11, the driving component 4 drives the prism 3 to rotate forward, and the prism 3 drives the flipping wheel 24 to rotate forward synchronously with the winding drum 22, so that the lifting line 23 is unwound from the winding drum 22 to release the lifting line 23. During the release process, the blades 5 fall under their own gravity until all the blades 5 are unfolded. At this time, the flipping belt 25 is just in a taut state under the gravity of the blades 5. S12, the driving component 4 continues to drive the prism 3 to rotate forward, so that the impeller 24 rotates forward and uses friction to drive the rotating belt 25 to rotate clockwise, so that the rotating belt 25 drives the blade 5 to rotate. When it is necessary to retract the unfolded blades 5, the following steps are included: S21, the driving component 4 drives the prism 3 to reverse, the prism 3 drives the winding drum 22 and the flip wheel 24 to reverse, the flip wheel 24 reverse drives the counterclockwise transmission of the flipping belt 25, so that all the blades 5 change from the flipped state to the flat state. At this time, the lifting line 23 is just in the tensioned state, and the flipping belt 25 is about to be in the slack state. S22 and prism 3 continue to reverse, driving the lifting line 23 to wind in the winding drum 22. During the winding process, the lifting line 23 drives the bottommost blade 5 to rise, so that several blades 5 are gathered under the profile bracket 1. When it is necessary to fold up the horizontally unfolded blade 5, the following steps are included: S31, the driving component 4 drives the prism 3 to reverse, the prism 3 drives the winding drum 22 and the impeller 24 to reverse, the impeller 24 reverses so that the turning belt 25 is in a relaxed state, the winding drum 22 reverses so that the lifting line 23 is wound in the winding drum 22, during the winding process the lifting line 23 drives the bottom blade 5 to rise upward, so that several blades 5 are gathered under the profile bracket 1.

[0031] In the above design, when the blade 5 is flipped, it is not necessary to set two driving components 4 to drive the blade 5 to retract and flip, making the whole operation more convenient.

[0032] Specifically: such as Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the flipping wheel 24 and the winding drum 22 are coaxially provided with prismatic holes that cooperate with the prism 3. The profile bracket 1 is provided with a flipping and winding rope assembly 2. The flipping and winding rope assembly 2 includes a winding drum 22, a flipping wheel 24, and a shaft bracket 21 for mounting the winding drum 22. The driving component 4 is installed in the profile bracket 1 and is coaxially and fixedly connected to the prism 3. When the blades 5 are unfolded, the two ends of the flipping belt 25 extend from the two tangential directions of the flipping wheel 24 and are connected to several blades 5. One end of the lifting line 23 is fixed to the winding drum 22, and the other end of the lifting line 23 is fixedly connected to the lowermost blade 5.

[0033] In actual use, the drive unit 4 drives the prism 3 to rotate, which in turn drives the winding drum 22 and the impeller 24 to rotate. When the lifting line 23 is being wound up or unwound, it only raises and lowers the bottommost blade 5.

[0034] In the above design, the impeller 24 and the winding drum 22 are provided with prismatic holes, which can rotate coaxially with the prism 3. The lifting line 23 can realize the winding and unwinding of the blades 5, and the impeller 24 can realize the flipping of all the blades 5.

[0035] Specifically: such as Figure 7 As shown, the impeller 24 is provided with an annular groove 240 with a V-shaped cross section. As shown, the flipping belt 25 includes a rope body that contacts the impeller roller through the annular groove 240 and several connecting ropes 253. The rope body includes an arc segment 251 that contacts the impeller 24 and two drooping segments 252 that are connected to both ends of the arc segment 251. The arc segment 251 contacts the impeller 24 through the annular groove 240. There are two winding drums 22, which are symmetrically arranged on both sides of the impeller 24. Each winding drum 22 includes a drum body 221 and a first end cap 222 and a second end cap 223 connected to both ends of the drum body 221. Both the first end cap 222 and the second end cap 223 are provided with prismatic holes for cooperating with the prism 3. The first end cap 222, the drum body 221 and the second end cap 223 form a winding groove 202. The second end cap 223 is provided with a wire-binding hole 201 for fixing the lifting wire 23.

[0036] One end of the lifting wire 23 is fixed through the wire-binding hole 201, and the other end of the lifting wire 23 is connected to the lowermost blade 5. After the lifting wire 23 is wound around the winding groove 202, the wound lifting wire 23 is limited by the first end cap 222 and the second end cap 223. When the prism 3 rotates, it drives the first end cap 222 and the second end cap 223 to rotate synchronously, so that the cylinder 221 rotates synchronously with the first end cap 222 and the second end cap 223.

[0037] In the above design, the annular groove 240 allows the rotating belt 25 to be embedded in the impeller 24, ensuring that the rotating belt 25 will not detach from the impeller 24 when tensioned. The structural design and specific implementation of the winding drum 22 effectively achieve the winding of the lifting line 23. The two sets of winding drums 22 and the two lifting lines 23 enable a more balanced unfolding and retraction of the blade 5.

[0038] Specifically: such as Figure 5As shown, when the flipping belt 25 is in a tensioned state, the flipping impeller 24 rotates in the forward direction and drives the flipping belt 25 to move through the friction between the arc segment 251 and the annular groove 240, so that one of the drooping segments 252 rises and the other drooping segment 252 falls, thereby achieving the tilting of the connecting rope 253, and thus using the connecting rope 253 to support the lower end face of the blade 5 to achieve the flipping of the blade 5.

[0039] Specifically: such as Figure 4 and Figure 5 As shown, the shaft frame 21 includes a base 211, an arc-shaped wheel cover 212, and two sets of rollers. The base 211 is provided with two first mounting slots for mounting the two winding drums 22 and a second mounting slot for mounting the impeller 24. The impeller 24 is located below the arc-shaped wheel cover 212. The base 211 is provided with two wire-passing holes located on both sides of the impeller 24. The two sets of rollers are centrally symmetrically arranged in the wire-passing holes along the impeller 24. Each set of rollers includes a first shaft 213 and a second shaft 214 that are horizontally perpendicular to the prism 3. The first shaft is located diagonally above the second shaft 214. The lifting line 23 is in contact with the roller surfaces of the first shaft 213 and the second shaft 214. The shaft frame 21 also includes two ball bearings 215. The first mounting slot is provided with a support surface that abuts against the outer ring of the ball bearing 215. The inner ring of the ball bearing 215 abuts against the first end cap 222.

[0040] When the winding drum 22 rotates, it drives the lifting line 23 to rise and fall. The lifting line 23 is tumbling connected to shaft 213 (first shaft) and shaft 214 (second shaft). After the blade 5 retracts, the contact portion between the tilting belt 25 and the tilting impeller 24 will tilt upwards. The arc-shaped wheel cover 212 can cover the tilting belt 25, preventing it from detaching from the tilting impeller 24. The winding drum 22 rotates within the first mounting slot, and the tilting impeller 24 rotates within the second mounting slot.

[0041] In the above design, the structural design and specific implementation of the shaft frame 21 can effectively limit the winding drum 22 and the impeller 24, preventing the winding drum 22 and the impeller 24 from moving along the axial direction of the prism 3. At the same time, the roller shaft can reduce the friction during the lifting process of the lifting line 23.

[0042] Specifically: when the blade 5 is retracted from the unfolded state, the flipping belt 25 changes from the tensioned state to the relaxed state. In the relaxed state, the flipping belt 25 will move upward relative to the annular groove 240. At this time, the upper end of the arc segment 251 is limited by the arc-shaped wheel cover 212.

[0043] Specifically: such as Figure 1As shown, the blades 5 include a lower beam 52 at the bottom and a number of wooden pieces 51 located above the lower beam 52. The lower beam 52 is provided with a horizontal through hole. The rope body is a loop and passes through the horizontal through hole. The two lifting lines 23 are fixedly connected to the two sides of the lower beam 52 respectively.

[0044] In actual use, when the blade 5 is lowered, the lower beam 52 can use its own weight to drive the wooden piece 51 below to fall.

[0045] In the above design, the lower beam 52 is equipped with a horizontal through hole to facilitate the accommodating of the lower end of the rope body, ensuring aesthetics, and allowing the blade 5 to be lowered completely by its own weight.

[0046] Specifically: when the blade 5 is unfolded, the lifting line 23 is released from the winding drum 22 and is in a taut state under the gravity of the lower beam 52.

[0047] Specifically: such as Figure 2 and Figure 3 As shown, the profile support 1 includes a bottom wall 11, side walls 12 symmetrically arranged on both sides of the bottom wall 11, and two baffles 13 that connect the two ends of the bottom wall 11 and the side walls 12 respectively. A protrusion 14 is provided on the opposite side of the side wall 12, and the shaft frame 21 is provided with a step that cooperates with the protrusion 14.

[0048] In actual assembly, the prism 3 is first assembled with the leaf-turning rope assembly 2. Then, the leaf-turning rope assembly 2 is slid into the predetermined position in the profile bracket 1 through the cooperation of the step and the protrusion 14, so as to realize the assembly of the leaf-turning rope assembly 2 and the profile bracket 1. Then, the driving component 4 is fixed on the bottom wall 11 and fixed to one end of the prism 3. Then, the two baffles 13 are assembled on the bottom wall 11 and the side wall 12 at both ends.

[0049] In the above design, the structural design and specific implementation of the profile bracket 1 and the shaft bracket 21 facilitate assembly and facilitate the movement of the leaf-turning rope assembly 2.

[0050] Specifically: such as Figure 2 and Figure 6 As shown, the prism 3 is also provided with a limiting component 6. The limiting component 6 includes a screw 61 with a prism-shaped hole, a limiting head 62 fixedly disposed on the outer side of one end of the screw 61, a bolt, and a brake pad 63 threadedly connected to the screw 61. The limiting head 62 is vertically provided with a screw hole 601 threadedly connected to the bolt. The brake pad 63 moves axially along the screw 61 by rotating the screw 61. The gap between the brake pad 63 and the profile bracket 1 is sufficient to prevent the brake pad 63 from rotating relative to the profile bracket 1.

[0051] During actual assembly, the position of brake pad 63 on screw 61 is adjusted, and this position of brake pad 63 is recorded as the initial position. Then, screw 61 is fitted onto prism 3 through the prismatic hole, and after being threaded into screw hole 601 by bolt, it abuts against prism 3 to fix prism 3 and screw 61, so that screw 61 and prism 3 can rotate synchronously. In actual use, since the forward rotation of the drum 22 can drive the lifting wire 23 to unwind from the drum 22, and the reverse rotation of the drum 22 can drive the lifting wire 23 to wind around the drum 22, in order to prevent the lifting wire 23 from rewinding after the drum 22 has completely unwound and then continuing to rotate, causing the lifting wire 23 to rewind onto the drum 22, the position of the brake pad 63 on the screw 61 is set so that the distance between the brake pad 63 and the limit head 62 is such that: the prism 3 drives the drum 22 to rotate forward, causing the screw 61 to rotate forward synchronously; when the lifting wire 23 in the drum 22 has finished unwinding, the limit head 61 abuts against the brake pad 63, and the operator feels the resistance to the rotation of the prism 3, thus stopping the drive component 4, thereby stopping the rotation of the screw 61 and the prism 3, and thus stopping the rotation of the drum 22.

[0052] In the above design, the structural design and specific implementation of the limiting component 6 can stop the rotation of the winding drum 22 in time after the lifting line 23 has been unwound, thus preventing the winding drum 22 from continuing to rotate and causing the lifting line 23 to become entangled.

[0053] In further detail, it should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for retracting and flipping Venetian blinds, characterized in that: When it is necessary for the blades (5) to unfold and flip, the following steps are included: S11, the driving component (4) drives the prism (3) to rotate forward. The prism (3) drives the flip wheel (24) and the winding drum (22) to rotate forward synchronously, so that the lifting line (23) is unwound from the winding drum (22) to release the lifting line (23). During the release process, the blades (5) fall under their own gravity until all the blades (5) are unfolded. At this time, the flipping belt (25) is just in a tensioned state under the gravity of the blades (5). S12, the driving component (4) continues to drive the prism (3) to rotate forward, so that the impeller (24) rotates forward and uses friction to drive the rotating belt (25) to rotate clockwise, so that the rotating belt (25) drives the blade (5) to rotate. When it is necessary to retract the unfolded blades (5), the following steps are included: S21, the driving component (4) drives the prism (3) to reverse, the prism (3) drives the winding drum (22) and the impeller (24) to reverse, the impeller (24) reverses and drives the counterclockwise transmission of the turning belt (25), so that all blades (5) change from the flipped state to the flat state. At this time, the lifting line (23) is just in the tensioned state, and the turning belt (25) is about to be in the slack state. S22, the prism (3) continues to reverse, driving the lifting line (23) to wind in the winding drum (22). During the winding process, the lifting line (23) drives the bottommost blade (5) to rise, so that several blades (5) are gathered under the profile bracket (1). When it is necessary to fold up the flat, unfolded blades (5), the following steps are included: S31, the driving component (4) drives the prism (3) to reverse, the prism (3) drives the winding drum (22) and the impeller (24) to reverse, the impeller (24) reverses so that the turning belt (25) is in a relaxed state, the winding drum (22) reverses so that the lifting line (23) is wound in the winding drum (22), during the winding process, the lifting line (23) drives the bottom blade (5) to rise, so that several blades (5) are gathered under the profile bracket (1).

2. The method for retracting and flipping venetian blinds according to claim 1, characterized in that: The flipping wheel (24) and the winding drum (22) are coaxially provided with a prismatic hole that cooperates with the prism (3). The profile bracket (1) is provided with a flipping rope assembly (2). The flipping rope assembly (2) includes a winding drum (22), a flipping wheel (24), and a shaft bracket (21) for mounting the winding drum (22). The driving component (4) is installed in the profile bracket (1) and is coaxially fixedly connected to the prism (3). When the blade (5) unfolds, the two ends of the flipping belt (25) extend from the two tangential directions of the flipping wheel (24) and connect with several blades (5). One end of the lifting line (23) is fixed on the winding drum (22), and the other end of the lifting line (23) is fixedly connected to the lowest blade (5).

3. The method for retracting and flipping venetian blinds according to claim 1, characterized in that: The impeller (24) is provided with an annular groove (240) with a V-shaped cross section. The turning belt (25) includes a rope body that contacts the impeller roller through the annular groove (240) and several connecting ropes (253). The rope body includes an arc segment (251) that contacts the impeller (24) and two drooping segments (252) that are connected to both ends of the arc segment (251). The arc segment (251) contacts the impeller (24) through the annular groove (240). There are two winding drums (22), and the two winding drums (22) are symmetrically arranged. The winding drum (22) is located on both sides of the impeller (24). It includes a drum body (221), a first end cap (222) and a second end cap (223) connected to both ends of the drum body (221). Both the first end cap (222) and the second end cap (223) are provided with prismatic holes for cooperating with the prism (3). The first end cap (222), the drum body (221) and the second end cap (223) form a winding groove (202). The second end cap (223) is provided with a bundle hole (201) for fixing the lifting wire (23).

4. The method for retracting and flipping venetian blinds according to claim 3, characterized in that: When the flipping belt (25) is in a taut state, the flipping impeller (24) rotates in the forward direction and drives the flipping belt (25) to move through the friction between the arc segment (251) and the annular groove (240), so that one of the drooping segments (252) rises and the other drooping segment (252) falls, thereby achieving the tilting of the connecting rope (253), and thus using the connecting rope (253) to support the lower end face of the blade (5) to achieve the flipping of the blade (5).

5. The method for retracting and flipping venetian blinds according to claim 2, characterized in that: The shaft frame (21) includes a base (211), an arc-shaped wheel cover (212), and two sets of rollers. The base (211) is provided with two first mounting slots for mounting the two winding drums (22) and a second mounting slot for mounting the impeller (24). The impeller (24) is located below the arc-shaped wheel cover (212). The base (211) is provided with two wire-passing holes located on both sides of the impeller (24). The two sets of rollers are arranged symmetrically around the impeller (24). Inside the wire hole, each set of rollers includes a first shaft (213) and a second shaft (214) that are horizontally perpendicular to the prism (3). The first shaft is located obliquely above the second shaft (214). The lifting line (23) is in contact with the roller surfaces of the first shaft (213) and the second shaft (214). The shaft frame (21) also includes two ball bearings (215). The first mounting groove is provided with a support surface that abuts against the outer ring of the ball bearing (215). The inner ring of the ball bearing (215) abuts against the first end cap (222).

6. The method for retracting and flipping venetian blinds according to claim 1, characterized in that: When the blade (5) is retracted from the unfolded state, the flipping belt (25) changes from the tensioned state to the relaxed state. In the relaxed state, the flipping belt (25) will move upward relative to the annular groove (240). At this time, the upper end of the arc segment (251) is limited by the arc-shaped wheel cover (212).

7. The method for retracting and flipping venetian blinds according to claim 3, characterized in that: The blades (5) include a lower beam (52) at the bottom and a number of wooden pieces (51) above the lower beam (52). The lower beam (52) is provided with a horizontal through hole. The rope body is a loop and passes through the horizontal through hole. The two lifting lines (23) are fixedly connected to the two sides of the lower beam (52) respectively. When the blades (5) are unfolded, the lifting lines (23) are released from the winding drum (22) and are in a taut state under the gravity of the lower beam (52).

8. The method for retracting and flipping venetian blinds according to claim 2, characterized in that: The profile bracket (1) includes a bottom wall (11), side walls (12) symmetrically arranged on both sides of the bottom wall (11), and two baffles (13) that connect the two ends of the bottom wall (11) and the side wall (12) respectively. A protrusion (14) is provided on the opposite side of the side wall (12), and the shaft bracket (21) is provided with a step that cooperates with the protrusion (14).

9. The method for retracting and flipping venetian blinds according to claim 1, characterized in that: The prism (3) is also provided with a limiting component (6). The limiting component (6) includes a screw (61) with a prism hole, a limiting head (62) fixedly disposed on the outside of one end of the screw (61), a bolt, and a brake pad (63) threadedly connected to the screw (61). The limiting head (62) is provided with a screw hole (601) threadedly connected to the bolt in a vertical direction. The brake pad (63) moves along the axial direction of the screw (61) by rotating the screw (61).

10. The method for retracting and flipping venetian blinds according to claim 9, characterized in that: After the bolt is threaded into the screw hole (601), it abuts against the prism (3) to fix the limiting component (6). By setting the position of the brake pad (63) on the screw (61), the distance between the brake pad (63) and the limiting head (62) is satisfied: the prism (3) drives the winding drum (22) to rotate forward, causing the screw (61) to rotate forward synchronously. When the lifting wire (23) in the winding drum (22) is unwound, the limiting head (61) abuts against the brake pad (63). The operator feels the resistance of the rotation of the prism (3) and stops driving the driving component (4), thereby stopping the rotation of the screw (61) and the prism (3) and stopping the rotation of the winding drum (22).

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