BLIND

Abstract

To provide a technology capable of compactifying a longitudinal width of a head box.SOLUTION: A blind comprises: a raising / lowering drum 241 which is rotatably stored in a head box 2 and to which a raising / lowering cord 61 for raising / lowering slats 4 is coupled in a windable and rewindable manner; a rotating drum 242 which is rotatably stored in the head box 2 and rotates the slats 4; and a second drive shaft 232 which is integrally rotatably coupled to the rotating drum 242 and on which rotary operation can be performed by an operation unit. The second drive shaft 232 is disposed so that at least part thereof passes directly below the raising / lowering drum 241.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present embodiment relates to blinds having a shielding material. [Background technology]

[0002] Conventionally, a blind of this type is known as shown in the following Patent Document 1. The blind shown in Patent Document 1 includes a rotating shaft rotatably supported on a head box, a first winding drum that fits coaxially around the rotating shaft and rotates in conjunction with the rotating shaft, a first winding drum that engages an end of a lifting cord that passes through the slats and has one end engaged with a bottom rail and the other end of the lifting cord is wound around the first winding drum, a second winding drum that fits coaxially around the rotating shaft and rotates in conjunction with the rotating shaft, and a pull-out cord that has one end engaged with the second winding drum and wound around the second winding drum, a pull-out cord that passes through the head box and has the other end hanging down outside the head box. The pull-out cord passes through a hollow operating rod that is connected to a tilting shaft that tilts the slats in the head box via a gear and can rotate the tilting shaft, and is led out from the lower end.

[0003] With such blinds, when the pull-out cord extending from the lower end of the operating rod is pulled down, the second winding drum rotates and the rotating shaft moves in tandem, causing the first winding drum to wind up the lifting cord and lift the slats. Rotating the operating rod also rotates the tilting shaft via the gears, allowing the slats to tilt. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 08-232559 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the blind described in Patent Document 1 mentioned above, the tilting shaft arranged below the lifting drum is positioned toward the front of the head box, which allows the rotation of the gear to be transmitted by direct meshing with the tilting shaft, but there is a problem in that the tilting drum is positioned in front of the lifting drum, which causes the front-to-rear width of the head box to become large.

[0006] The present invention has been made to solve the above-mentioned problems, and has an object to provide a technique that can reduce the front-to-rear width of the head box. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, one aspect of the present invention comprises a lifting drum that is rotatably housed within a head box and to which a lifting cord for raising and lowering a shielding material is connected so that it can be wound and unwound, a rotating drum that is rotatably housed within the head box and rotates the shielding material, and a drive shaft that is connected to the rotating drum so that it can rotate integrally with the rotating drum and can be rotated by an operating unit, and is characterized in that at least a portion of the drive shaft is positioned so that it passes directly below the lifting drum. Effect of the Invention

[0008] According to the present invention, the front-rear width of the head box can be made compact. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a front view showing the blind according to the embodiment. [Diagram 2] FIG. 2 is a vertical cross-sectional view showing the internal structure of the head box. [Diagram 3] FIG. 2 is a perspective view showing the internal structure of a head box. [Figure 4] 3 is a cross-sectional view taken along line AA shown in FIG. 2. [Diagram 5] This is a cross-sectional view corresponding to line AA near the lifting drum located in the center. [Figure 6]FIG. 2 is a vertical cross-sectional view showing the internal structure of the operation unit. [Figure 7] FIG. 3 is a cross-sectional view taken along line BB shown in FIG. [Figure 8] 3 is a cross-sectional view taken along line CC shown in FIG. 2. [Figure 9] 13 is a cross-sectional view equivalent to line CC when the operating cord is pulled. FIG. [Figure 10] FIG. 3 is a cross-sectional view taken along line DD shown in FIG. [Figure 11] FIG. 5 is a cross-sectional view equivalent to line DD when the operating cord is pulled. [Figure 12] 3 is a cross-sectional view taken along line EE shown in FIG. 2. [Figure 13] 4 is a cross-sectional view taken along line EE in a state in which the operation cord is pulled. [Figure 14] 1 is a side view showing a state in which the slats are in a lowermost position in a blind according to an embodiment of the present invention. [Figure 15] 1 is a side view showing a state in which the operating cord is pulled and the slats are raised in the blind according to the embodiment. FIG. [Figure 16] 1 is a side view showing a state in which the operating cord of the blind according to the embodiment is released. FIG. [Figure 17] 1 is a side view showing a state in which the slats are tilted by rotating an operating member in the blind according to the embodiment. FIG. [Figure 18] FIG. 5 is a cross-sectional view taken along line BB of the blind according to the first modified example. [Figure 19] FIG. 11 is a vertical cross-sectional view of the vicinity of the lifting drum in a blind according to a second modified example. [Figure 20] 20 is a cross-sectional view taken along the line FF shown in FIG. 19. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this embodiment, the present invention will be described by taking as an example a case where the present invention is applied to a horizontal blind having slats as a shielding material. In this embodiment, the surface facing the room when the blind is installed will be referred to as the front, the surface facing the outside of the room as the back, the direction consisting of the front and back as the front-rear direction, and the longitudinal direction of the blind as the left-right direction. In this specification and drawings, components having substantially the same functions will be given the same reference numerals to avoid redundant description.

[0011] (Overall composition) First, the overall structure of the blind according to this embodiment will be described. Fig. 1 is a front view showing the blind according to this embodiment. In this figure, the bottom rail is lowered to the lowest position, and the slats are horizontal, that is, the blind is shown in a fully open state. Also, in Fig. 1, only the head box and its interior are shown.

[0012] As shown in FIG. 1, a blind 1 according to this embodiment includes a head box 2, an operation unit 3 provided in the head box 2, a plurality of slats 4, and a bottom rail 5.

[0013] The head box 2 is fixed to a window frame or the like via a plurality of brackets 21, and head box caps 22 are detachably provided on both side surfaces. Inside the head box 2, there are provided a first drive shaft 231 and a second drive shaft 232, three lifting drums 241, three rotating drums 242 (not shown here) (see FIG. 2), a brake device 250 that reduces the speed of rotation of the first drive shaft 231, and a stopper device 260 that restricts the rotation of the first drive shaft 231.

[0014] The operation unit 3 is provided on the right side in the figure inside the head box 2, and engages with one end of an operation member 36 hanging down from the head box 2. When this operation member 36 is operated by an operator, the operation unit 3 rotates the first drive shaft 231 and the second drive shaft 232.

[0015] The slats 4 are supported by ladder cords 62 so that multiple slats 4 are arranged in the vertical direction between the head box 2 and the bottom rail 5. One end of the ladder cords 62 is connected to the rotating drum 242 and hangs down from the head box 2, and the other end is connected to the bottom rail 5, and the ladder cords 62 are arranged in front of and behind the slats 4 so as to sandwich the slats 4 and individually support the slats 4. Therefore, in response to the rotation of the rotating drum 242, the front and rear ladder cords 62 move relative to each other in the vertical direction and tilt, and the slats 4 rotate to a fully closed state, horizontal (fully open), semi-fully closed state, etc.

[0016] The bottom rail 5 is suspended and supported at the lowest end of the blind 1 by connecting one end of a lifting / lowering cord 61, the other end of which is connected to the lifting / lowering drum 241 so as to be capable of being wound and unwound. Therefore, the lifting / lowering cord 61 moves up and down as it is wound and unwound by the lifting / lowering drum 241, and the multiple slats 4 move up and down due to this lifting / lowering movement.

[0017] Next, the configuration of each of the drive shafts and drums described above will be described with reference to Fig. 2 to Fig. 5. Fig. 2 is a vertical cross-sectional view showing the internal structure of the head box, and Fig. 3 is a perspective view thereof. Fig. 4 is a cross-sectional view taken along line AA shown in Fig. 2, and Fig. 5 is a cross-sectional view corresponding to line AA in the vicinity of the lifting drum located in the center.

[0018] 2 and 3, the lifting drum 241 is rotatably housed in a lifting drum receiver 243 provided in the head box 2, and is connected to the first drive shaft 231 so as to be rotatable together with the first drive shaft 231 by passing through the lifting drum receiver 243. A cord holder 244 is provided on the lifting drum receiver 243, and the lifting cord 61 hangs down from below the cord holder 244. The above configuration is the same for all three lifting drums 241, but as shown in FIG. 1, the lifting drum 241 on the left side of the figure is disposed in the opposite direction to the other two lifting drums 241 due to the storage space in the head box 2, and the winding direction of the lifting cord 61 is also reversed.

[0019] One end of the first drive shaft 231 reaches the operation unit 3, and is connected to an interlocking member 324 (described later) so as to be rotatable together with the operation unit 3. As a result, the three lifting drums 241 rotate in the same direction via the first drive shaft 231 in response to the rotation of the interlocking member 324. In this embodiment, the lifting drums 241 are connected to the first drive shaft 231 via an input drum 245, as shown in FIG.

[0020] The rotating drum 242 is rotatably housed in a rotating drum receiver 246 attached to the lifting drum receiver 243, and is connected to the second drive shaft 232 so as to be rotatable therewith by passing through the rotating drum 242. One end of the second drive shaft 232 reaches the operation unit 3, and is connected to an output gear 341 so as to be rotatable therewith. When the operator rotates the operation member 36, the output gear 341 transmits the driving force to the second drive shaft 232, and the second drive shaft 232 rotates in response to the driving force, causing the three rotating drums 242 to rotate in the same direction.

[0021] 3 and 4, in this embodiment, the second drive shaft 232 is disposed so as to pass directly below the lift drum 241, more specifically, the second drive shaft 232 is disposed vertically below the first drive shaft 231 so that the front-rear positions of the first drive shaft 231 and the second drive shaft 232 are the same, and as a result, the rotating drum 242 is located directly below the lift drum 241. In addition, since the rotating drum 242 is formed to have a smaller diameter than the lift drum 241, the diameter range L2 of the rotating drum 242 in the front-rear direction shown in Fig. 4 is located within the diameter range L1 of the lift drum 241 in the same direction.

[0022] By configuring it in this manner, the rotating drum 242 can be positioned within the range of the lifting drum 241 in the fore-and-aft direction of the head box 2, making it possible to reduce the fore-and-aft width of the head box 2 compared to a case in which part or all of the rotating drum 242 is positioned outside that range.

[0023] As shown in FIG. 4, the lifting cord 61 hanging down from the lifting drum 241 at the right end in FIG. 1 in the vicinity of the operation unit 3, that is, in the front-rear direction rearward, extends in the vertical direction without substantially bending as it abuts against the rear roller 247 rotatably provided in the rotating drum receiver 246 so as to pass behind the rotating drum 242. This is the same for the lifting drum 241 at the left end in FIG. 1. For the sake of explanation, these lifting drums will also be referred to as the first lifting drum 241. On the other hand, as shown in FIG. 5, the lifting cord 61 hanging down from the lifting drum 241 at the center in FIG. 1 is routed so as to straddle the rotating drum 242 from the rear side in the front-rear direction to the front side in the front-rear direction, and extends in the vertical direction after slightly bending as it abuts against the front roller 248 rotatably provided in the rotating drum receiver 246 so as to pass in front of the rotating drum 242. For the sake of explanation, this lifting drum will also be referred to as the second lifting drum 241.

[0024] With this configuration, the lifting cords 61 sandwich the slats 4 in the front-rear direction, so that stable lifting and lowering operation can be realized, and the lifting cords 61 hanging down from the first lifting drum 241 hang down from the rear of the head box 2 without bending, so that the generation of load can be suppressed. Furthermore, although the lifting cords 61 hanging down from the second lifting drum 241 bend more than the lifting cords 61 hanging down from the first lifting drum 241, they can be routed with less bending resistance. Therefore, the load on the lifting cords 61 can be reduced. Furthermore, the lifting cords 61 of the second lifting drum 241 are routed so as to straddle the rotating drum 242 below, so that the lifting cords 61 can be routed in front of the rotating drum 242 without interfering with the drum.

[0025] In this embodiment, the second lift drum 241 is disposed between the two first lift drums 241, but it goes without saying that the first lift drum 241 may be disposed between the two second lift drums 241.

[0026] (Configuration of operation unit 3) Next, the configuration of the above-mentioned operation unit 3 will be described with reference to Figures 1 to 3 and 6 to 9. Figure 6 is a vertical cross-sectional view showing the internal structure of the operation unit, and Figure 7 is a cross-sectional view taken along line BB shown in Figure 2. Figure 8 is a cross-sectional view taken along line CC shown in Figure 2, and Figure 9 is a view equivalent to the cross-section taken along line CC in a state in which the operation cord is pulled. For the sake of explanation, Figure 6 does not show the operation cord 361, and shows a cross-section seen from the left side.

[0027] The operation unit 3 raises and lowers the slats 4 together with the bottom rail 5 by pulling down the operation cord 361. For example, when lowering the bottom rail 5, the slats 4 can be lowered to the lowest position together with the bottom rail 5 at a constant speed by lightly pulling down the cord stopper 362 (see FIG. 1) to which the operation cord 361 is connected. When raising the bottom rail 5 that has been lowered to the lowest position, the slats 4 can be raised together with the bottom rail 5 by pulling down the cord stopper 362 by the amount that it is lowered. When the cord stopper 362 is released in this state, only the operation cord 361 is wound up while the bottom rail 5 remains stopped, and the bottom rail 5 can be raised again by pulling it down again after it is wound up.

[0028] As shown in Figures 2 and 3, the operation unit 3 has a clutch mechanism for rotating the first drive shaft 231 in only one direction, which is composed of a pulley 321, a power spring 322, an adapter 323, and an interlocking member 324, etc., built into main body cases 31a to 31c, and a tilting mechanism for rotating the second drive shaft 232, which is composed of an output gear 341, an intermediate gear 342, etc., and one end of the operation member 36 is engaged with the intermediate gear 342 so as to be able to rotate it.

[0029] First, various configurations related to the operation cord 361 and the configuration of the tilting mechanism will be described.

[0030] As shown in Figures 6 and 7, the pulley 321 is journalled by a fixed shaft 311 of the main body case 31a so as to be relatively rotatable, and an operation cord 361 of the operation member 36 is connected thereto so as to be capable of being wound and unwound. As shown in Figures 8 and 9, the power spring 322 has one end connected to the pulley 321 and the other end connected to the fixed shaft 311, and constantly applies a biasing force to the pulley 321 in the winding direction so that the operation cord 361 is wound up. As a result, when an operator pulls down the operation cord 361, as shown in Figure 9, the operation cord 361 is unwound from the pulley 321 and the pulley 321 rotates, and the power spring 322 contracts in diameter in response to the rotation.

[0031] As shown in FIG. 7, the operation cord 361 is formed in a string shape, and one end is connected to the pulley 321 as described above, and the other end hangs down from the pulley 321 and is inserted into the operation member 36 and connected to the cord stopper 362 (see FIG. 1 and FIG. 14). Although the operation cord 361 is biased in the winding direction, the cord stopper 362 abuts against the lower end of the hollow operation rod 363 of the operation member 36, so that the operation cord 361 is prevented from being wound any further. The lower part of the operation rod 363 is expanded in diameter to form a gripping part for the operator to grip when operating the operation member 36, and the cord stopper 362 abuts against the lower end of this gripping part. On the other hand, when the cord stopper 362 is pulled down so as to be separated from the operation rod 363 and then released, the operation cord 361 is wound by the main spring 322, and the cord stopper 362 and the operation rod 363 are again in abutting state.

[0032] As shown in Figs. 6 and 7, the operating rod 363 of the operating member 36 is connected to the tilt input shaft 365 at its upper end via a joint portion 364 so as to be rotatable together with the tilt input shaft 365. The tilt input shaft 365 is rotatably supported in the head box 2, and an input gear 366, which is a so-called worm wheel, is provided at its upper end. The input gear 366 meshes with an intermediate gear 342, which is a so-called worm gear rotatably supported in the main body cases 31a and 31b. The intermediate gear 342 is engaged with the output gear 341, with its axis located below and forward of the axis of the output gear 341 (second drive shaft 232), which is also a worm gear, and is capable of transmitting a rotational force to the output gear 341. Therefore, the rotation of the operating rod 363 is transmitted to the joint portion 364, the tilt input shaft 365, and the input gear 366, and the driving force is transmitted to the second drive shaft 232 via the intermediate gear 342 and the output gear 341.

[0033] An insertion hole 367 through which operation cord 361 is inserted is provided in tilt input shaft 365, and an introduction port 368 for introducing operation cord 361 into insertion hole 367 is formed at the upper end of the insertion hole 367. The introduction port 368 faces an opening formed by main body case 31a and main body case 31b and communicates with it, and operation cord 361 that has passed through the opening and introduction port 368 is introduced into insertion hole 367. In this embodiment, tilt input shaft 365 is disposed so that introduction port 368, specifically, its front-to-rear width W, is located in the vertical direction at the position where operation cord 361 hangs down from pulley 321.

[0034] According to the above configuration, operation cord 361 hangs down from pulley 321, and adjacent portion 361a adjacent to pulley 321 extends in a substantially vertical direction, and is introduced into introduction port 368. As a result, when cord stopper 362 is pulled down, the direction in which operation cord 361 is pulled out from pulley 321 and the direction in which operation cord 361 hangs down from pulley 321 are substantially the same, so that the load on operation cord 361 can be reduced compared to the conventional case. This is also true when operation cord 361 is wound around pulley 321. Also, introduction port 368 is located in the vertical direction at the hanging position of operation cord 361, so operation cord 361 can be guided in a substantially vertical direction simply by routing operation cord 361 toward introduction port 368. Furthermore, since the operating cord 361 extends in an approximately vertical direction and is introduced into the inlet 368, the tilt input shaft 365 is brought closer to the pulley 321 in the front-to-rear direction, so that the amount of protrusion of the tilt input shaft 365 in front of the head box 2 can be reduced, thereby improving the design.

[0035] In addition, in this embodiment, since the second drive shaft 232 is disposed directly below the lift drum 241, if the input gear 366 of the tilt input shaft 365 is directly meshed with the output gear 341, the introduction port 368 cannot be positioned in the vertical direction of the drooping position of the operation cord 361, making it difficult to extend the operation cord 361 in a substantially vertical direction and introduce it into the introduction port 368, which in turn increases the bending resistance of the operation cord 361 in the operation member 36. However, by interposing the intermediate gear 342 between the input gear 366 and the output gear 341 and positioning the axis of the intermediate gear 342 below the second drive shaft 232, the input gear 366 can be positioned in the vertical direction of the drooping position together with the introduction port 368. This makes it easy to extend the operation cord 361 in the vertical direction and introduce it into the introduction port 368, thereby reducing the bending resistance of the operation cord 361 in the operation member 36.

[0036] A curved guide surface 312 is formed on the inner wall surface of main body case 31a above introduction port 368 in order to adjust the introduction angle of operation cord 361 into introduction port 368. Guide surface 312 is curved to have continuity with the inner circumferential surface of insertion hole 367 as shown in Fig. 7, whereby operation cord 361 comes into contact with guide surface 312, allowing the cord to be inserted into insertion hole 367 without unnecessarily bending the cord.

[0037] In addition, the tilt input shaft 365 is preferably inclined at an inclination angle X of 35° or less with respect to the vertical direction so that the lower end is located further forward in the front-rear direction than the upper end. This makes it possible to reduce the bending angle of the operation cord 361 that passes through the joint portion 364 and is introduced into the operation rod 363. In consideration of the space occupied by the output gear 341 and the intermediate gear 342 and the interference between the tilt input shaft 365 and the slat 4, the inclination angle X is more preferably in the range of 15° to 25°, and particularly preferably at an angle of about 20°. Note that these angles are preferably set appropriately according to the width of the slat 4, and for example, the above angles may be applied to slats with a width of 25 mm to 35 mm.

[0038] Next, the configuration of the clutch mechanism will be described. Figure 10 is a cross-sectional view taken along line DD in Figure 2, and Figure 11 is a cross-sectional view equivalent to line DD in the state where the operating cord is pulled. Figure 12 is a cross-sectional view taken along line EE in Figure 2, and Figure 13 is a cross-sectional view equivalent to line EE in the state where the operating cord is pulled.

[0039] As shown in Figures 12 and 13, the operation unit 3 includes, in addition to the pulley 321, the spiral spring 322, the adapter 323, and the interlocking member 324 described above as a clutch mechanism, an intermediate shaft 325, a clutch drum 326, a clutch pin 327, a guide washer 328, and a cam drive 329.

[0040] As shown in Fig. 10, the adapter 323 is formed in a substantially disk shape, and a protrusion 321a of the pulley 321 is fitted into the central portion of the adapter 323, and the adapter 323 is connected to the pulley 321 so as to be rotatable together with the pulley 321. One end of the intermediate shaft 325 is fitted into the fixed shaft 311 as shown in Fig. 7, and the other end is fitted into the hollow portion of the clutch drum 326 as shown in Fig. 12 to support the intermediate shaft 325 so as not to rotate relative to the fixed shaft 311. The clutch drum 326 is hollow cylindrical, and a clutch spring 330 is fitted into the peripheral wall of the clutch drum 326. The clutch pin 327 is cylindrical, and transmits / receives the rotation of the pulley 321 to / from the interlocking member 324 by advancing and retreating in the radial direction.

[0041] Guide washer 328 is a hollow disk-like member through which clutch drum 326 passes and is supported so as to be capable of relative rotation. Guide washer 328 has three sets of projections 328a on one surface thereof for guiding the advancement and retreat of clutch pin 327, and two sets of projections 328b for rotating integrally with cam drive 329, as shown in FIG.

[0042] As shown in FIG. 12, the cam drive 329 is a hollow disk-shaped member through which the clutch drum 326 penetrates and is supported so as to be capable of relative rotation. The cam drive 329 is provided with a protrusion 329b having a cam surface on one side thereof for moving the clutch pin 327 back and forth, and a protrusion 329c capable of abutting against a protrusion 328b of a guide washer 328. The cam drive 329 is capable of relative rotation with the guide washer 328, but the relative rotation is restricted when the protrusion 328b abuts against the protrusion 329c. The interlocking member 324 is fitted with the first drive shaft 231 in the main body case 31c so as not to be capable of relative rotation, and is provided with an engagement portion 324a protruding inwardly in a radial direction so as to be capable of engaging with the clutch pin 327, as shown in FIG. 12.

[0043] (Slat lifting and lowering action by clutch mechanism) The operation of the operation unit 3 configured as above will be described. First, the raising and lowering operation of the slats 4 by the clutch mechanism when the operation cord 361 is pulled will be briefly described with reference to Figs. 14 to 16. Fig. 14 is a side view showing a state in which the slats are at their lowest position in the blind according to this embodiment. Fig. 15 is a side view showing a state in which the slats have been raised by pulling the operation cord. Fig. 16 is a side view showing a state in which the operation cord has been released.

[0044] As shown in FIG. 14, when the bottom rail 5 has already been lowered to the lowest position, the clutch pin 327 is not engaged with the engaging portion 324a of the interlocking member 324 as shown in FIG. 12. As shown in FIG. 15, when the operator pulls down the cord stopper 362 of the operating member 36, the operating cord 361 is unwound and the pulley 321 rotates. Then, the pulley 321 starts to rotate integrally with the cam drive 329 via the adapter 323, and the clutch pin 327 is pushed radially outward by the cam surface of the projection 329b and engages with the engaging portion 324a of the interlocking member 324. At the time of this engagement, the projection 328b and the projection 329c come into contact with each other, resulting in the state shown in FIG. 13. As a result, the rotation of the pulley 321 is transmitted to the first drive shaft 231 via the interlocking member 324, and they rotate integrally. As the first drive shaft 231 rotates, the lifting drum 241 winds up the lifting cord 61, thereby lifting the bottom rail 5 as shown in FIG.

[0045] When the operator stops pulling down the cord stopper 362, the first drive shaft 231 tries to rotate downward due to the weight of the bottom rail 5, but the stopper device 260 (see FIG. 1) is activated to stop the rotation. When the operator releases the cord stopper 362 while pulling it, the pulley 321 rotates in the reverse direction due to the biasing force of the spiral spring 322, and the operating cord 361 is wound up. At this time, the protrusion 329b of the cam drive 329 no longer pushes up the clutch pin 327, but the clutch pin 327 rotates in the reverse direction together with the cam drive 329 while being sandwiched between the protrusion 328a of the guide washer 328, and is pushed down by the engaging portion 324a of the interlocking member 324 stopped by the stopper device 260, and the engagement is released. This release of engagement allows the pulley 321 and the interlocking member 324 to rotate relative to each other, and only the pulley 321 rotates in the reverse direction. Therefore, the reverse rotation is not transmitted to the first drive shaft 231, and the position of the raised bottom rail 5 remains unchanged.

[0046] As a result, the first drive shaft 231 is stopped by the stopper device 260, the operating cord 361 is wound around the pulley 321, and the cord stopper 362 comes into contact with the lower end of the operating rod 363, resulting in the state shown in FIG. 16. The operator can raise the slat 4 together with the bottom rail 5 to the highest position by repeating the pulling down operation of the cord stopper 362 of the operating member 36 several times. On the other hand, to lower the raised slat 4 and bottom rail 5, the operator pulls the cord stopper 362 and releases it when the operating cord 361 is pulled out slightly, and the stop of the stopper device 260 is released via the first drive shaft 231, and the slat 4 and bottom rail 5 descend by their own weight. At this time, the slat 4 and bottom rail 5 descend by their own weight while being decelerated by the action of the brake device 250 that decelerates the rotation of the first drive shaft 231.

[0047] (Tilting movement of slats by tilting mechanism) Next, the tilting action of the slat 4 by the tilting mechanism when the operating cord 361 is pulled will be briefly described with reference to Figure 17. Figure 17 is a side view showing a state in which the slat has been tilted by rotating the operating member.

[0048] As shown in Fig. 17, when the operating rod 363 of the operating member 36 is rotated in one direction, the joint portion 364, the tilt input shaft 365, and the input gear 366 rotate by the same amount, and the driving force is transmitted to the intermediate gear 342 meshing with the input gear 366. The driving force is transmitted to the output gear 341 via the intermediate gear 342, and the second driving shaft 232 connected to the gear rotates. The rotating drum 242 rotates in response to the rotation of the second driving shaft 232, and the ladder cord 62 is wound up, thereby tilting (rotating) the slat 4. On the other hand, when the operating rod 363 is rotated in the opposite direction, the second driving shaft 232 rotates in the opposite direction to the above, and the slat 4 tilts in the opposite direction.

[0049] According to the present embodiment described above, the second drive shaft 232 is positioned directly below the lifting drum 241, so that the rotating drum 242 can be positioned below the lifting drum 241, thereby making the front-to-rear width of the head box 2 compact.

[0050] Furthermore, according to this embodiment, the proximal portion 361a of the operating cord 361 hanging down from the pulley 321, which is close to the pulley 321, can be extended in a substantially vertical direction and introduced into the operating member 36, thereby reducing the load applied to the operating cord 361 when winding and unwinding the operating cord 361.

[0051] <First Modification> Fig. 18 is a cross-sectional view taken along line BB of a blind according to a first modified example of this embodiment. As shown in Fig. 18, it is preferable to provide roller 312a that is rotatable relative to guide surface 312. By providing roller 312a on guide surface 312, the contact distance (sliding distance) of operating cord 361 with guide surface 312 can be reduced, and since roller 312a rotates when the cord slides along guide surface 312, the load on operating cord 361 can be further reduced.

[0052] <Second Modification> Fig. 19 is a vertical cross-sectional view of the vicinity of the lifting drum in a blind according to a second modified example of this embodiment, and Fig. 20 is a cross-sectional view taken along line FF shown in Fig. 19. As shown in Fig. 19, the rotating drum 242 is offset to the right in the figure in the axial direction (left-right direction) compared to the rotating drum 242 shown in Fig. 2, and one end is supported by a lifting drum receiver 243 so as to be relatively rotatable.

[0053] By moving the rotating drum 242 in the left-right direction relative to the lift-up drum 241 in this manner, it is possible to avoid interference between the lift-up cord 61 and the rotating drum 242. This increases the degree of freedom in routing the lift-up cord 61, and for example, as shown in Fig. 20, the lift-up cord 61 can be inserted into an insertion hole 41 provided in the center of the slat 4 in the front-rear direction. In this case, compared to a configuration in which multiple lift-up cords 61 hang down to the front and rear of the slat 4, there is no need to provide front and rear rollers 247, 248, and the lift-up cord 61 routed from one side to the other side in the front-rear direction can be bent more gently, thereby reducing the load on the cord.

[0054] Although one end of the rotating drum 242 has been described here as being supported by the lifting drum receiver 243 so as to be relatively rotatable, it may alternatively be supported by the rotating drum receiver 246. Also, the rotating drum 242 may be offset to the left in the drawing.

[0055] The present invention can be implemented in various other forms without departing from the spirit or main features thereof. Therefore, the above-described embodiments are merely illustrative in all respects and should not be interpreted as being limiting. The scope of the present invention is defined by the claims and is not limited to the text of the specification. Furthermore, all modifications, various improvements, substitutions and alterations within the scope of the claims are within the scope of the present invention. [Explanation of symbols]

[0056] 1. Blinds 2 Head Box 4 Slats (shielding material) 232 Second drive shaft (drive shaft) 241 Lifting drum 242 Rotating Drum 31a~31c Main body case (case) 312 Guideway (Guideway) 312a Laura 321 Pulley 342 Intermediate Gear 36 Operation member (operation part) 361 Operation Code 363 Operation rod (operation part) 364 Joint Materials 365 Tilting input shaft (operation part) 366 Input Gear 367 Insertion hole 368 Introduction 61 Lifting cord

Claims

1. a lifting drum that is rotatably accommodated in the head box and to which a lifting cord for lifting and moving the shielding material is connected so as to be capable of being wound and unwound; A rotating drum that is rotatably accommodated in the head box and rotates the shielding material; a drive shaft that is connected to the rotary drum so as to be rotatable together with the rotary drum and that can be rotated by an operating unit; Equipped with The drive shaft is disposed so that at least a portion of the drive shaft passes directly below the lift drum, The rotating drum is disposed below the lifting drum, The lifting drum and the rotating drum are provided in a plurality of parts along the extension direction of the head box, Among the plurality of lifting drums, a lifting cord hanging down from a first lifting drum hangs down from the rear side of the head box so as to pass behind a rotating drum located below the first lifting drum, and a lifting cord hanging down from a second lifting drum hangs down from the front side of the head box so as to pass in front of a rotating drum located below the second lifting drum, The lifting cord hanging down from the first lifting drum or the lifting cord hanging down from the second lifting drum is routed so as to straddle the rotating drum from one side in the front-rear direction to the other side in the front-rear direction, and hangs down from the other side in the front-rear direction of the head box. A blind characterized by:

2. a lifting drum that is rotatably accommodated in the head box and to which a lifting cord for lifting and moving the shielding material is connected so as to be capable of being wound and unwound; A rotating drum that is rotatably accommodated in the head box and rotates the shielding material; a drive shaft that is connected to the rotary drum so as to be rotatable together with the rotary drum and that can be rotated by an operating unit; An operating cord is connected so as to be capable of being wound and unwound, and the lifting drum is connected to a rotatable pulley by operating the operating cord. Equipped with The drive shaft is disposed so that at least a portion of the drive shaft passes directly below the lift drum, The operating cord hangs down from the pulley, and a portion adjacent to the pulley extends in a substantially vertical direction, and is introduced into the operating section. A blind characterized by:

3. a lifting drum that is rotatably accommodated in the head box and to which a lifting cord for lifting and moving the shielding material is connected so as to be capable of being wound and unwound; A rotating drum that is rotatably accommodated in the head box and rotates the shielding material; a drive shaft that is connected to the rotary drum so as to be rotatable together with the rotary drum and that can be rotated by an operating unit; an intermediate gear that is rotatably supported in the head box and engages with an input gear formed in the operation unit to transmit the rotation of the operation unit to the drive shaft; Equipped with The drive shaft is disposed so that at least a portion of the drive shaft passes directly below the lift drum, The axis of the intermediate gear is located below the axis of the drive shaft. A blind characterized by:

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