JP7633856B2 - Drum unit for blinds - Google Patents

Description

The present invention relates to a blind drum device.

A conventional blind drum device is shown in JP 2000-179260 A (Patent Document 1). In the blind drum device disclosed in this document, the lifting cord is suspended from a take-up pulley rotatably supported on a cord support, and the upper end of the ladder cord is attached to a cord drum rotatably supported on the cord support. The cord drum is provided with an absorbing means for absorbing any misalignment between the cord drum and the ladder cord suspension position when the cord drum is supported on the cord support.

With this configuration, the cord drum is rotatably supported on the cord support by being journaled at one of the multiple support parts that serve as absorbing means for rotatably supporting the cord support. This allows the ladder cord to be suspended and supported in close proximity to the lifting cord.

JP 2000-179260 A

In the conventional blind drum device described above, the cord drum is arranged above the winding pulley to bring the ladder cord and the lifting cord close to each other. For example, when assembling, it is necessary to attach the cord drum after assembling the winding pulley to the cord support. Also, the ladder cord hanging down from the cord drum needs to be passed through the cord support while detouring a narrow space while preventing interference with the winding pulley. Furthermore, when maintenance of the winding pulley is required, it is difficult to access the winding pulley from above the head box, so it is necessary to remove the cord drum, which poses problems in terms of maintenance, including assembly.

The present invention was made in consideration of these problems, and its purpose is to provide a blind drum device with improved maintainability.

In order to solve the above problem, according to the present invention, there is provided a drum device for blinds, which is fixed inside a head box of a blind, and which comprises a drum receiver and at least two drums, the drum receiver having a first drum receiving portion on which a first drum is rotatably supported and a second drum receiving portion on which a second drum is rotatably supported, the first drum receiving portion and the second drum receiving portion are arranged such that the axial centers of the first drum and the second drum are at different heights in the vertical direction and are offset in the axial direction so that the first drum and the second drum do not overlap in the axial direction, and the cord connected to the first drum and the cord connected to the second drum can hang down from positions close to or aligned in the axial direction.

With this configuration, the cord connected to the first drum and the cord connected to the second drum can hang down from positions close to or aligned in the axial direction, resulting in a good design. In addition, the first drum and the second drum are offset in the axial direction, making it easier to route the cord and providing easy access to each drum, resulting in excellent maintainability.

Also, by shifting the axis of the second drum vertically from that of the first drum, it is possible to arrange two drive shafts. This can be applied not only to horizontal blinds in which the slats are raised and lowered and rotated by separate rotating shafts, but also to two-stage blinds in which two groups of slats arranged above and below can be switched between separate open and closed states if the first drum is a lift-and-lower rotating drum and the second drum is a rotating drum.

The present invention can be applied in various ways. For example, the first drum receiving portion and the second drum receiving portion may have a communication portion that communicates with each other, and the cord connected to the second drum may be able to hang down from the first drum receiving portion side via the communication portion. With this configuration, the cord connected to the second drum can be guided to the first drum side via the communication portion, so that the cord connected to the second drum and the cord connected to the first drum can be hung down close to each other or in alignment. In addition, the cord connected to the second drum can be routed within the first drum receiving portion, and the cord can be operated without interference from other parts in the head box.

The first drum receiving portion may also include a cord outlet that connects the inside of the first drum receiving portion to the outside of the head box, and the cord connected to the second drum may be guided diagonally downward from the connection portion toward the cord outlet. With this configuration, the connection portion and the cord outlet guide the cord connected to the second drum diagonally downward toward the outside of the head box, so that the cord is guided without resisting the direction of movement of the cord moving up and down. This reduces the load associated with the movement of the cord.

The cord connected to the second drum is a ladder cord with a middle cord on which the slats are placed, and the portion of the ladder cord that is placed inside the head box may not have a middle cord of the ladder cord. With this configuration, the ladder cord can be assembled and moved without the middle cord getting in the way.

The first drum receiving portion and the second drum receiving portion may be integrated by engaging them together. With this configuration, the first drum receiving portion and the second drum receiving portion are integrated by engaging them together, which improves assembly and also provides excellent maintainability, since the two can be separated by releasing the engagement.

The second drum receiving portion may also be formed with a locking portion that locks onto the wall of the first drum receiving portion. With this configuration, the first drum receiving portion and the second drum receiving portion can be easily integrated together simply by locking the locking portion of the second drum receiving portion onto the wall of the first drum receiving portion. Since it is no longer necessary to place the second drum receiving portion directly on the bottom surface of the head box, it is possible to position the second drum receiving portion at an upper position within the head box. This allows the space within the head box to be effectively utilized, for example by placing other parts below the second drum receiving portion.

The second drum receiving portion may be formed with a lift-up prevention portion that prevents the second drum receiving portion from lifting up from the first drum receiving portion. With this configuration, the second drum receiving portion is prevented from lifting up, so the second drum can be stably supported.

The blind drum device of the present invention makes it possible to improve maintainability. Other advantages of the present invention will be described in the detailed description of the invention below.

1 is a front view of a blind 10 equipped with a drum device 100 of a first embodiment. FIG. 2 is an enlarged partial cross-sectional view of part A in FIG. 1A and 1B are oblique views showing the drum receiving portion 110, in which (a) shows the first drum receiving portion 120 and the second drum receiving portion 130 separated, and (b) shows the first drum receiving portion 120 and the second drum receiving portion 130 integrated together. 5A and 5B are perspective views showing an engaged state of the first drum receiving portion and the second drum receiving portion, in which FIG. 5A shows the separated state and FIG. 5B shows the integrated state. FIG. 2 is a perspective view of the drum device 100. 3A is a cross-sectional view taken along line BB of FIG. 2, and FIG. 3B is a cross-sectional view taken along line CC of FIG. 2. FIG. 11 is a front view of a blind 50 equipped with a drum device 200 according to a second embodiment. 1A is a schematic side view of a blind 50, in which (a) shows the slats in a horizontal state, (b) shows the state in which only the upper slats are tilted, and (c) shows the state in which both the upper and lower slats are tilted. FIG. 8 is an enlarged partial cross-sectional view of part D in FIG. 7 . 10A is a cross-sectional view taken along line EE of FIG. 9, and FIG. 10B is a cross-sectional view taken along line FF of FIG. 10 is a diagram showing a portion of the drum device 200, and is a cross-sectional view taken along line GG in FIG. 9.

A preferred embodiment of the present invention will be described in detail below with reference to the attached drawings. Note that in this specification and drawings, components having substantially the same functional configuration are designated by the same reference numerals to avoid redundant description.

(First embodiment)
The configuration of a blind 10 equipped with a drum device 100 according to a first embodiment will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is a front view of the blind 10 equipped with the drum device 100 of this embodiment. Fig. 2 is an enlarged partial cross-sectional view of part A in Fig. 1.

The drum device 100 is fixed in the head box 12 of the blind 10. The drum device 100 includes a drum receiver 110 and at least two drums 140, 150. The drum receiver 110 has a first drum receiver 120 on which the first drum 140 is rotatably supported, and a second drum receiver 130 on which the second drum 150 is rotatably supported. The first drum receiver 120 and the second drum receiver 130 are disposed at positions offset in the axial direction so that the first drum 140 and the second drum 150 do not overlap in the axial direction. The lifting cord 18 connected to the first drum 140 and the ladder cord 14 connected to the second drum 150 can be hung from positions close to or aligned in the axial direction.

First, the overall structure of the blind 10 will be described with reference to Figure 1. As shown in Figure 1, the blind 10 mainly comprises a head box 12 that is fixed via brackets to a window frame or the like (not shown), ladder cords 14 that hang down from the head box 12, slats 16 that are supported in an aligned state by the ladder cords 14, and a lifting cord 18 that raises and lowers the slats 16.

A first rotating shaft 20 and a second rotating shaft 22 are rotatably supported within the head box 12. A first drum 140 is provided on the first rotating shaft 20 so as to rotate in conjunction with the first rotating shaft 20. A second drum 150 is provided on the second rotating shaft 22 so as to rotate in conjunction with the first rotating shaft 20. The ladder cord 14 tilts with the rotation of the second drum 150, rotating the slats 16. The portion of the ladder cord 14 that is disposed within the head box 12 does not have a middle cord for placing the slats 16 on. The lifting cord 18 is wound and unwound by the rotation of the first drum 140, lifting and lowering the slats 16.

In addition, the head box 12 includes a first motor 24 for driving the first rotating shaft 20, a second motor 26 for driving the second rotating shaft 22, an encoder 28 for detecting the amount of rotation of the first rotating shaft 20, a first drive unit 30 for driving the first motor 24, a second drive unit 32 for driving the second motor 26, a control unit 34 for controlling the driving of the first drive unit 30 and the second drive unit 32, a switching power supply 38 for generating DC voltages for the motor and control from a commercial power supply 36, a limit switch 40 for detecting when the slats 16 have been folded up to the upper limit, and a switching power supply 38 for generating DC voltages for the motor and control from the commercial power supply 36.

The overall configuration of the blind 10 has been described above. Below, the configuration of each part of the drum device 100, which is a characteristic configuration of this embodiment, will be described with reference to FIG. 2. The drum device 100 includes a drum receiver 110 and at least two drums 140, 150. The drum receiver 110 has a first drum receiver 120 on which the first drum 140 is rotatably supported, and a second drum receiver 130 on which the second drum 150 is rotatably supported. The aforementioned limit switch 40 is disposed in the space below the second drum receiver 130 in the head box 12.

The first drum receiving portion 120 and the second drum receiving portion 130 are disposed at positions offset in the axial direction so that the first drum 140 and the second drum 150 do not overlap in the axial direction. The lifting cord 18 connected to the first drum 140 and the ladder cord 14 connected to the second drum 150 hang down from positions close to or aligned in the axial direction.

(Drum receiver 110)
The drum receiver 110 rotatably supports the first drum 140 and the second drum 150. The configuration of the drum receiver 110 will be described with reference to Figs. 3 and 4. Fig. 3 is a perspective view showing the drum receiver 110. Fig. 4 is a perspective view showing an engagement state of the first drum receiving portion 120 and the second drum receiving portion 130. The drum receiver 110 has the first drum receiving portion 120 on which the first drum 140 is rotatably supported, and the second drum receiving portion 130 on which the second drum 150 is rotatably supported.

(First drum receiving portion 120)
3(a), the first drum receiving portion 120 includes a rectangular bottom portion 121, and a first wall portion 122 and a second wall portion 123 extending vertically from both ends of the short side of the bottom portion 121. The bottom portion 121 of the first drum receiving portion 120 is placed and fixed on the bottom surface of the head box 12. A lift/lower cord outlet 124 is formed in the bottom portion 121 to allow the lift/lower cord 18 to hang down from the head box 12.

In addition, ladder cord outlets 125 for hanging the ladder cord 14 from the head box 12 are formed on both sides of the lift cord outlet 124 on the bottom 121. As such, the lift cord outlet 124 and the ladder cord outlet 125 are in the same axial position, so that when the blind 10 is viewed from the front, the lift cord 18 and the ladder cord 14 overlap at the front and rear. This improves the design of the blind 10.

As shown in FIG. 3(b), the first drum receiving portion 120 rotatably supports the first drum 140 between the first wall portion 122 and the second wall portion 123. As shown in FIG. 3(a), two first communication portions 126 through which the ladder cord 14 passes are formed near both ends of the lower portion of the first wall portion 122. In addition, approximately L-shaped receiving portions 127 are formed on the sides close to each other of the two first communication portions 126, respectively, and are bent in a direction approaching each other.

As shown in FIG. 3(a), two latching portions 128 are formed on the top of the first drum receiving portion 120 to latch onto latching portions 133 of the second drum receiving portion 130 (described later). The latching portions 128 each include a generally U-shaped groove portion 128a extending vertically, and an L-shaped groove portion 128b (see FIG. 2) formed in a stepped shape at the top end of the first drum receiving portion 120.

As shown in FIG. 3(a), a support portion 129 that supports the first drum 140 is formed in the center in the front-rear direction between the engaging portions 128 of the first wall portion 122 and protrudes in the axial direction.

(Second drum receiving portion 130)
As shown in Fig. 3(a), the second drum 150 is rotatably supported on the upper part of the second drum receiving part 130. Two second communication parts 131 through which the ladder cords 14 are inserted are formed on the lower part of the second drum receiving part 130. The second communication parts 131 are disposed at positions corresponding to the first communication parts 126 of the first drum receiving part 120, and have a generally U-shaped shape with an open lower part. When the second drum receiving part 130 is attached to the first drum receiving part 120, the second communication parts 131 communicate with the first communication parts 126 as shown in Fig. 3(b).

As shown in FIG. 4(a), a lift-up prevention portion 132 that protrudes toward the first drum receiving portion 120 is formed on the upper edge of the second communication portion 131. When the second drum receiving portion 130 is attached to the first drum receiving portion 120, the lift-up prevention portion 132 is engaged with the upper edge of the first communication portion 126 from below, as shown in FIG. 2. This prevents the second drum receiving portion 130 from lifting up.

As shown in FIG. 4(a), a locking portion 133 is formed above the second communication portion 131 of the second drum receiving portion 130. The locking portion 133 has a generally T-shaped protrusion toward the first drum receiving portion 120. As shown in FIG. 4(b), the generally T-shaped vertical portion 133a of the locking portion 133 is inserted into the U-shaped groove portion 128a of the locked portion 128 of the first drum receiving portion 120 and locked.

The horizontal portion 133b of the approximately T-shape of the locking portion 133 is formed in an approximately L-shape, as shown in FIG. 2. When the vertical portion 133a of the locking portion 133 is inserted into the U-shaped groove portion 128a of the locked portion 128, the L-shaped groove portion 128b of the first drum receiving portion 120 is locked so as to be inserted into the inside of the approximately L-shape of the horizontal portion 133b.

As shown in FIG. 3(a), an opening 134 is formed from the lower end toward the upper end in the center of the second drum receiving portion 130 in the front-rear direction between the second communicating portions 131. As shown in FIG. 3(b), the support portion 129 of the first drum receiving portion 120 is inserted into the opening 134. In addition, the leg portion 135 formed between the opening 134 and the second communicating portion 131 is inserted between the first wall portion 122 and the receiving portion 127 of the first drum receiving portion 120 as shown in FIG. 3(b), restricting the movement of the second drum receiving portion 130 in the axial direction and the front-rear direction.

The above describes the configuration of the first drum receiving portion 120 and the second drum receiving portion 130. Next, the procedure for assembling the first drum receiving portion 120 and the second drum receiving portion 130 will be described with reference to Figures 2 to 4. As shown in Figure 3(a), the locking portion 133 (see Figure 4(a)) of the second drum receiving portion 130 is positioned so as to face the first wall portion 122 of the first drum receiving portion 120.

Then, the second drum receiving portion 130 is slid downward while in contact with the first wall portion 122. Then, as shown in FIG. 4(b), the locking portion 133 is locked so that the vertical portion 133a is inserted into the locked portion 128 of the first drum receiving portion 120 and the L-shaped groove portion 128b is inserted into the inside of the approximately L-shape of the horizontal portion 133b. In this way, the locking portion 133 is locked to the locked portion 128, restricting the movement of the second drum receiving portion 130 in the downward, front-rear, and axial directions.

When the locking portion 133 is locked to the locked portion 128, the lift-up prevention portion 132 is locked to the upper edge of the first communicating portion 126 from below, as shown in FIG. 2. This prevents the second drum receiving portion 130 from lifting up.

Furthermore, the leg portion 135 formed between the second communication portion 131 and the opening 134 of the second drum receiving portion 130 is inserted between the receiving portion 127 and the first wall portion 122 of the first drum receiving portion 120, as shown in FIG. 3(b). This restricts the movement of the second drum receiving portion 130 in the axial direction and the front-rear direction.

In this way, the second drum receiving portion 130 is attached to the first drum receiving portion 120 by the locking portion 133 of the second drum receiving portion 130 locking the first wall portion 122 of the first drum receiving portion 120. As shown in FIG. 2, since the second drum receiving portion 130 does not need to be placed directly on the bottom surface of the head box 12, it is possible to position the second drum receiving portion 130 at an upper position within the head box 12. This allows the limit switch 40 to be positioned below the second drum receiving portion 130.

The configuration of the drum device 100 has been described above. Below, the state in which the ladder cord 14 and the lift cord 18 are attached to the drum device 100 will be described with reference to Figures 5 and 6. Figure 5 is a perspective view of the drum device 100. Figure 6 is a diagram showing a portion of the drum device 100, where (a) is a cross-sectional view taken along line B-B in Figure 2, and (b) is a cross-sectional view taken along line C-C in Figure 2.

As shown in Figures 5 and 6(a), the ladder cord 14 hangs down along the second drum receiving part 130 from both the front and rear sides of the second drum 150, passes through the second communication part 131 and the first communication part 126, and is inserted into the first drum receiving part 120. At the first drum receiving part 120 side, it is guided in the axial direction along the bottom part 121, passes through the ladder cord outlet 125, and hangs down below the head box 12.

As shown in Figures 5 and 6(b), the lifting cord 18 hangs down from the bottom of the first drum 140 and hangs down below the head box 12 through the lifting cord outlet 124. In this way, the lifting cord 18 hangs down at a position almost close to the ladder cord 14 in the axial direction.

The head box 12 is further provided with a second drum device 300 (see FIG. 1). The second drum device 300 allows only the ladder cord 14 to hang down from the head box 12, and does not allow the lifting cord 18 to hang down. Therefore, the second drum device 300 can be configured with the second drum receiving portion 130 and a configuration that simplifies the portion of the first drum receiving portion 120 up to the ladder cord outlet 125.

(Effects of the First Embodiment)
As described above, according to this embodiment, the first drum 140 and the second drum 150 are arranged offset in the axial direction, which makes it easier to route the cords and provides easy access to each drum, resulting in excellent maintainability.

In addition, the ladder cord 14 connected to the second drum 150 can be guided to the first drum 140 side via the communication portion, so the ladder cord 14 connected to the second drum 150 and the lift cord 18 connected to the first drum 140 can be brought close to each other. This results in good design.

In addition, the ladder cord 14 connected to the second drum 150 can be routed within the first drum receiving portion 120, allowing the ladder cord 14 to operate without interference from other parts within the head box 12.

In addition, the first and second communication parts 126, 131 and the ladder cord outlet 125 guide the ladder cord 14 diagonally downward, so that the ladder cord 14 is guided in the vertical movement direction without resisting the movement direction. This reduces the load caused by the movement of the ladder cord 14.

In addition, the ladder cord 14 can be installed or moved without the middle cord getting in the way.

Furthermore, the first drum receiving portion 120 and the second drum receiving portion 130 can be easily integrated by simply engaging the engaging portion of the second drum receiving portion 130 with the wall portion of the first drum receiving portion 120. Since there is no need to place the second drum receiving portion 130 directly on the bottom surface of the head box 12, it is possible to place the second drum receiving portion 130 at an upper position within the head box 12. This allows the space within the head box 12 to be effectively utilized, for example, by arranging other parts below the second drum receiving portion 130.

In addition, the second drum receiving portion 130 is prevented from floating up, so the second drum 150 can be stably supported.

In addition, by vertically shifting the axis of the second drum 150 from the axis of the first drum 140, it is possible to position two rotating shafts 20 and 22.

Second Embodiment
The configuration of a blind 50 equipped with a drum device 200 according to a second embodiment will be described with reference to Figs. 7 and 8. Fig. 7 is a front view of the blind 50 equipped with the drum device 200 according to the second embodiment. Fig. 8 is a schematic side view of the blind 50. This embodiment differs from the blind 10 and drum device 100 of the first embodiment in that the blind 50 is an upper and lower two-stage blind in which the slats can be operated in two stages, upper and lower, with an intermediate rail in between, and in the configuration of the drum device 200. Other points can be configured in the same way as in the first embodiment. In this embodiment, the points different from the first embodiment will mainly be described.

First, the overall structure of the blind 50 will be described with reference to FIG. 7. As shown in FIG. 7, the blind 10 comprises an intermediate rail 60, an upper slat 56-1 arranged above the intermediate rail 60, and a lower slat 56-2 arranged below the intermediate rail 60. As shown in FIG. 8, the upper slat 56-1 is supported by an upper ladder cord 54, and the lower slat 56-2 is supported by a lower ladder cord 55. The lifting cord 18 is inserted through the upper slat 56-1, intermediate rail 60, and lower slat 56-2 and connected to the bottom rail 62.

As shown in FIG. 8(a), the upper end of the upper ladder cord 54 is connected to the second drum 150 in the same manner as the ladder cord 14 of the first embodiment, and the lower end is connected to the intermediate rail 60. As shown in FIG. 8(a), the upper end of the lower ladder cord 55 is connected to the third drum 260, and passes through the upper slat 56-1 and the intermediate rail 60 together with the lifting cord 18, and the lower end is connected to the bottom rail 62. Details of the third drum 260 will be described later.

When the second drum 150 rotates, as shown in FIG. 8(b), the upper ladder cord 54 tilts, causing the upper slat 56-1 and the middle rail 60 to tilt. The lower slat 56-2 does not move. When the third drum 260 rotates, as shown in FIG. 8(c), the lower ladder cord 55 tilts, causing the lower slat 56-2 and the bottom rail 62 to tilt. The upper slat 56-1 does not move.

(Drum device 200)
The configuration of the drum device 200 will be described with reference to Figures 9 and 10. Figure 9 is an enlarged partial cross-sectional view of part D in Figure 7. Figure 10 is a diagram showing a portion of the drum device 200, where (a) is a cross-sectional view taken along line E-E in Figure 9, and (b) is a cross-sectional view taken along line F-F in Figure 9. The drum device 200 can be configured in the same way as the drum device 100 of the first embodiment, except that it is provided with a third drum 260, so differences will be described below.

As shown in FIG. 9, the third drum 260 is rotatably supported by the first drum receiving section 120. The lower ladder cord 55, whose upper end is connected to the third drum 260, descends inside the first drum receiving section 120 and hangs down below the head box 12 from the same ladder cord outlet 125 as the upper ladder cord 54.

As shown in FIG. 10(b), the third drum 260 passes through its axis so that the first rotating shaft 20, which drives the first drum 140 to rotate, rotates together with it. The third drum 260 rotates together with the first drum 140 for a predetermined angle when the first rotating shaft 20 rotates, but is configured so that it spins freely when the first rotating shaft 20 rotates any further.

The layout of the upper ladder cord 54, the lower ladder cord 55, and the lift cord 18 will be described with reference to FIG. 10 and FIG. 11. FIG. 11 is a view showing a part of the drum device 200, and is a cross-sectional view taken along line G-G in FIG. 9. As shown in FIG. 10(a), the upper ladder cord 54 is guided downward along the second drum receiving portion 130 from both sides of the first drum 140 in the front-rear direction, similar to the ladder cord 14 of the first embodiment. Then, as shown in FIG. 9, it is guided into the first drum receiving portion 120 by passing through the second communication portion 131 and the first communication portion 126, respectively. Thereafter, as shown in FIG. 11, it passes through the ladder cord outlet 125 and hangs down below the head box 12.

The lower ladder cord 55 is guided downward from both front and rear sides of the third drum 260, as shown in FIG. 10(b). Then, as shown in FIG. 9, the lower ladder cord 55 is guided axially along the bottom surface of the first drum receiving portion 120. Thereafter, the lower ladder cord 55 passes through the ladder cord outlet 125 and hangs down below the head box 12, as shown in FIG. 11. At this time, the lower ladder cord 55 is arranged inside the upper ladder cord 54.

As shown in FIG. 11, the lifting cord 18 hangs down from below the first drum 140, similar to the first embodiment, and hangs down below the head box 12 through the lifting cord outlet 124 below. In this way, the upper ladder cord 54, the lower ladder cord 55, and the lifting cord 18 hang down from positions close to or aligned in the axial direction.

(Effects of the Second Embodiment)
As described above, according to this embodiment, the raising and lowering and rotation of the slats 16 are performed by separate drive shafts, so if the first drum 140 is a raising and lowering rotating drum and the second drum 150 is a rotating drum, the present invention can also be applied to two-stage blinds in which the two slat groups 56-1, 56-2 arranged above and below can be switched between separate open and closed states.

Although the preferred embodiment of the present invention has been described above with reference to the attached drawings, it goes without saying that the present invention is not limited to such an example. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

For example, in the above embodiment, the first drum receiving portion 120 and the second drum receiving portion 130 have communicating portions 126, 131 that communicate with each other, and the ladder cord 14 connected to the second drum 150 is configured to be able to hang down from the first drum receiving portion 120 side via the communicating portions 126, 131, but the present invention is not limited to this example. Any configuration can be used as long as the cord connected to the first drum and the cord connected to the second drum can hang down from positions close to or aligned with each other in the axial direction of the head box. For example, the cord may be configured to pass outside one or both of the first drum receiving portion and the second drum receiving portion.

In the above embodiment, the first drum receiving portion 120 is provided with a cord outlet 125 that connects the inside of the first drum receiving portion 120 to the outside of the head box 12, and the ladder cord 14 connected to the second drum 150 is guided diagonally downward from the communication portions 126, 131 toward the ladder cord outlet 125, but the present invention is not limited to this example. Any configuration can be used as long as the cord connected to the first drum and the cord connected to the second drum can hang down from positions close to or aligned with each other in the axial direction of the head box. For example, the cord may be guided diagonally upward or change course in the forward and backward directions.

In the above embodiment, the ladder cord 14 that supports the slats is connected to the second drum 150, and the middle cord of the ladder cord 14 is not provided in the portion of the ladder cord 14 that is placed inside the head box 12, but the present invention is not limited to this example. A middle cord may be provided as long as it does not interfere with the assembly, operation, or installation of the ladder cord.

In addition, in the above embodiment, the first drum receiving portion 120 and the second drum receiving portion 130 are configured to be integrated by engaging with each other, but the present invention is not limited to this example. The first drum receiving portion and the second drum receiving portion may be molded as an integral drum receiving portion.

In addition, in the above embodiment, the second drum receiving portion 130 is formed with a locking portion 133, and the locking portion 133 is configured to lock the first wall portion 122 of the first drum receiving portion 120, but the present invention is not limited to this example. The locking between the second drum receiving portion and the first drum receiving portion can be configured in any way.

In addition, in the above embodiment, the second drum receiving portion 130 is configured to have a lift prevention portion 132 that prevents the second drum receiving portion 130 from lifting up from the first drum receiving portion 120, but the present invention is not limited to this example. The first drum receiving portion and the second drum receiving portion can have any configuration as long as they are integrated by engaging with each other.

In addition, in the above embodiment, the second drum 150 is supported by the second drum receiving portion 130 so that its axis is at a different height in the vertical direction relative to the axis of the first drum 140, but the present invention is not limited to this example. As long as the cord connected to the first drum and the cord connected to the second drum can hang down from positions close to or aligned with each other in the axial direction of the head box, the first drum and the second drum can be arranged in any manner.

The above embodiments, application examples, and variations can be implemented in any combination.

REFERENCE SIGNS LIST 10, 50 Blind 12 Head box 14 Ladder cord 18 Lifting cord 100, 200 Drum device 110 Drum receiver 120 First drum receiver portion 122 First wall portion 124 Lifting cord outlet 125 Ladder cord outlet 126 First communication portion 128 Locked portion 130 Second drum receiver portion 131 Second communication portion 132 Lifting prevention portion 133 Locking portion 140 First drum 150 Second drum 260 Third drum 300 Second drum device

Claims (8)

A drum device that is fixed in a head box of a blind that can operate the slats in two stages, upper and lower, consisting of upper and lower slats ,
A drum receiver and at least three drums,
The drum receiver has a first drum receiving portion on which the first drum and the third drum are rotatably supported, and a second drum receiving portion on which the second drum is rotatably supported,
The first drum is connected to a lifting cord for lifting and lowering the upper and lower two tiers of slats,
The second drum is connected to an upper ladder cord for rotatably supporting the upper slat,
A lower ladder cord for rotatably supporting the lower slat is connected to the third drum,
the first drum receiving portion and the second drum receiving portion are disposed such that the axial centers of the first drum and the third drum , and the second drum are at different heights in the vertical direction, and the first drum and the third drum are disposed such that the first drum and the third drum do not overlap with the second drum in the axial direction,
A blind drum device, characterized in that the lifting cord, the upper ladder cord , and the lower ladder cord can hang down from positions close to or aligned with the head box in the axial direction. 2. The blind drum device of claim 1, wherein the first drum receiving portion and the second drum receiving portion have a communicating portion that communicates with each other, and the upper ladder cord connected to the second drum is introduced into the first drum receiving portion through the communicating portion and can hang down from a position close to or aligned with the lifting cord connected to the first drum and the lower ladder cord connected to the third drum . The first drum receiving portion has a cord outlet port that communicates between the inside of the first drum receiving portion and the outside of the head box,
3. The blind drum device according to claim 2, wherein the upper ladder cord connected to the second drum is guided obliquely downward from the communication portion toward the cord guide outlet. 4. A blind drum device as described in claim 1, wherein the upper ladder cord connected to the second drum includes a middle cord on which the upper slats are placed, and the portion of the upper ladder cord that is positioned within the head box does not include a middle cord of the upper ladder cord. The blind drum device according to any one of claims 1 to 4, characterized in that the first drum receiving portion and the second drum receiving portion are integrated by engaging with each other. The second drum receiving portion is formed with a locking portion,
6. The blind drum device according to claim 1, wherein the locking portion locks a wall portion of the first drum receiving portion. A drum device fixed within a headbox of a blind, comprising:
A drum receiver and at least two drums,
The drum receiver has a first drum receiving portion on which the first drum is rotatably supported, and a second drum receiving portion on which the second drum is rotatably supported,
The first drum receiving portion and the second drum receiving portion are disposed so that the axial centers of the first drum and the second drum are at different heights in the vertical direction and are offset in the axial direction so that the first drum and the second drum do not overlap in the axial direction,
The cord connected to the first drum and the cord connected to the second drum can hang down from adjacent or coincident positions in the axial direction of the head box ,
The first drum receiving portion and the second drum receiving portion are integrated by being locked together,
A blind drum device, characterized in that the second drum receiving portion is formed with a lift-up prevention portion that prevents the second drum receiving portion from lifting up from the first drum receiving portion . A drum device fixed within a headbox of a blind, comprising:
A drum receiver and at least two drums,
The drum receiver has a first drum receiving portion on which the first drum is rotatably supported, and a second drum receiving portion on which the second drum is rotatably supported,
The first drum receiving portion and the second drum receiving portion are disposed so that the axial centers of the first drum and the second drum are at different heights in the vertical direction and are offset in the axial direction so that the first drum and the second drum do not overlap in the axial direction,
The cord connected to the first drum and the cord connected to the second drum can hang down from adjacent or coincident positions in the axial direction of the head box ,
The second drum receiving portion is formed with a locking portion,
The locking portion locks a wall portion of the first drum receiving portion,
A blind drum device, characterized in that the second drum receiving portion is formed with a lift-up prevention portion that prevents the second drum receiving portion from lifting up from the first drum receiving portion .