JP7248472B2 - sound insulation system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a technology of a sound insulation system using a roll screen.

2. Description of the Related Art Conventionally, a technique of a roll screen having a rotatable spindle and a screen wound around the spindle is known. For example, it is as described in Patent Document 1.

The technique described in Patent Document 1 has a configuration in which a pair of screens curled in different directions are integrally pulled out for use. With such a configuration, when the pair of screens are pulled out (unfolded state), the curling of the pair of screens cancels each other. This makes it possible to obtain a flat screen.

Such a roll screen may be used for the purpose of sound insulation as well as light blocking and shielding. However, since the sound insulation performance of the roll screen depends on the material, weight, etc. of the screen, there are cases where a sufficient sound insulation effect cannot be obtained, such as resonance occurring in a specific sound range. In addition, it is assumed that the ambient sound (especially noise) that is the target of sound insulation covers various sound ranges depending on the source. Therefore, there is a demand for a sound insulation system that can arbitrarily change the sound insulation performance according to the noise.

Japanese Utility Model Laid-Open No. 61-194090

SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances as described above, and a problem to be solved is to provide a sound insulation system capable of changing the sound insulation performance.

The problems to be solved by the present invention are as described above, and the means for solving the problems will now be described.

That is, in claim 1, a first roll screen comprising a first screen and a first winding shaft around which the first screen is wound, a second screen, and the first The second screen is arranged on the side of the winding shaft of the second screen so that the position of the second screen with respect to the first screen can be changed by changing the winding method of the second screen. a second roll screen comprising a second winding shaft around which the screen is wound, wherein the second roll screen comprises a weight bar provided at the lower end of the second screen; The weight bar has a suppression mechanism that suppresses the occurrence of slack in the second screen when grounded, and the second roll screen rotates the second winding shaft with the weight bar grounded. By rotating it, it is possible to incline the second screen with respect to the vertical direction .

In claim 2, a first screen, a first roll screen comprising a first winding shaft around which the first screen is wound, a second screen, and the first roll The second screen is arranged on the side of the shaft, and the second screen is arranged so that the position of the second screen with respect to the first screen can be changed by changing the way the second screen is wound. A second roll screen having a second winding shaft wound around it, an actuator for rotationally driving the second winding shaft, a control unit capable of controlling the operation of the actuator, and detecting ambient sound. a detection unit, wherein the control unit controls the operation of the actuator based on the ambient sound detected by the detection unit .

In claim 3, the second roll screen comprises a weight bar provided at the lower end of the second screen, and the weight bar suppresses the occurrence of slack in the second screen when it touches the ground. It is equipped with a suppressing mechanism for

In claim 4, the suppressing mechanism includes a fixing portion fixed to the lower end portion of the second screen, and an accommodating portion accommodating the fixing portion so that the fixing portion can move up and down. It is equipped .

A fifth aspect of the present invention further comprises an actuator for rotationally driving the second winding shaft, and a control section capable of controlling the operation of the actuator.

In a sixth aspect, the apparatus further comprises a detection section for detecting ambient sound, and the control section controls the operation of the actuator based on the ambient sound detected by the detection section.

As effects of the present invention, the following effects are obtained.

In claim 1, the sound insulation performance can be changed. Also, it is possible to suppress the occurrence of slack in the second screen. Moreover, the width between the screens can be changed according to the height, and the occurrence of resonance can be effectively suppressed.

In claim 2, the sound insulation performance can be changed. In addition, the sound insulation performance can be automatically changed. Also, the sound insulation performance can be changed according to the ambient sound.

In claim 3, it is possible to suppress the occurrence of slack in the second screen.

In claim 4, the suppressing mechanism can have a simple configuration.

In claim 5, the sound insulation performance can be automatically changed.

In claim 6, the sound insulation performance can be changed according to the ambient sound.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which showed the structure of the sound insulation system which concerns on 1st embodiment of this invention. Schematic side view and partially enlarged sectional view of the same. Schematic side view showing how the position of the screen is changed. Schematic side view and partially enlarged cross-sectional view showing the operation of the suppressing mechanism. The schematic side view which showed the example which changed the width of the air layer. The side schematic diagram which showed the state which made the screen incline and used it. The perspective view which showed the structure of the sound insulation system which concerns on 2nd embodiment.

In the following description, for the sake of convenience, the up-down direction, the left-right direction, and the front-rear direction are defined according to the arrows shown in the drawings.

First, the configuration of a sound insulation system 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. The sound insulation system 1 is for blocking (insulating) ambient sounds (in particular, noise that affects people's health and living environment). The sound insulation system 1 mainly comprises a first roll screen 10 and a second roll screen 20 .

In addition, in this embodiment, the first roll screen 10 and the second roll screen 20 have substantially the same configuration. Therefore, the configuration of the first roll screen 10 will be specifically described below, and the description of the configuration of the second roll screen 20 will be omitted.

The first roll screen 10 mainly comprises a winding shaft 11 , a support portion 12 , a screen 13 , a weight bar 14 and a chain 15 .

The winding shaft 11 is a shaft around which a screen 13, which will be described later, is wound. The winding shaft 11 is formed in a substantially cylindrical shape. The winding shaft 11 is arranged with its longitudinal direction directed substantially horizontally (left and right in this embodiment).

The support portion 12 rotatably supports the winding shaft 11 . The support portions 12 are arranged at both ends of the winding shaft 11 . The support portion 12 is fixed to an appropriate location (in this embodiment, the ceiling 4 to be described later).

The screen 13 is a sheet-like member for properly partitioning the space. The screen 13 is formed using an appropriate fabric. The screen 13 is formed in a substantially rectangular shape. One end (upper end) of the screen 13 is fixed at a predetermined position (fixed position P) on the outer peripheral surface of the winding shaft 11 (see FIG. 3).

The weight bar 14 stretches the screen 13 by its own weight. A weight bar 14 is provided at the lower end of the screen 13 . The weight bar 14 mainly includes a fixing portion 14a and a housing portion 14b.

The fixed portion 14 a is fixed to the lower end portion of the screen 13 . The fixed portion 14 a is formed in a longitudinal shape extending substantially horizontally along the lower end portion of the screen 13 . The fixing portion 14a is formed in a rectangular shape when viewed from the side. The fixing portion 14a is fixed to the lower end portion of the screen 13 inside a housing portion 14b, which will be described later.

The accommodation portion 14b accommodates the fixing portion 14a. The accommodating portion 14 b is formed in a longitudinal shape extending substantially horizontally along the lower end portion of the screen 13 . The housing portion 14b is formed in a hollow shape (box shape). The vertical width of the inside (hollow portion) of the accommodating portion 14b is formed to be larger than the vertical width of the fixed portion 14a.

A slit 14c is formed in the upper surface of the housing portion 14b. The lower end of the screen 13 is inserted into the housing portion 14b through the slit 14c. A fixing portion 14a is fixed to the lower end portion of the screen 13 in the accommodation portion 14b. The width of the slit 14c is formed smaller than that of the fixed portion 14a. Therefore, the accommodating portion 14b does not come off from the lower end portion of the screen 13. As shown in FIG.

The chain 15 is an operating tool for rotating the winding shaft 11 . The chain 15 is connected to the winding shaft 11 at one end of the winding shaft 11 . The chain 15 is provided so as to hang down from the winding shaft 11 to a predetermined height. The user can rotate the winding shaft 11 in any direction by rotating the chain 15 .

As described above, the configuration of the second roll screen 20 is substantially the same as the configuration of the first roll screen 10 . Each constituent member of the second roll screen 20 is illustrated with the same reference numeral as the corresponding constituent member of the first roll screen 10 .

The first roll screen 10 and the second roll screen 20 are arranged adjacent to the window 2 . Specifically, as shown in FIG. 2, the second roll screen 20 is arranged so as to be adjacent to the indoor side of the window 2 (rear in FIG. 2). Further, the first roll screen 10 is arranged on the side of the second roll screen 20 (and adjacent to the indoor side). At this time, the winding shaft 11 of the first roll screen 10 and the winding shaft 11 of the second roll screen 20 are arranged at the same height and in parallel.

For convenience, the window 2 exemplified in the present embodiment is formed from the floor 3 to the vicinity of the ceiling 4 (so-called sweep window), but the present invention is not limited to this, and various other windows can be used. (Large window, bay window, etc.) may be used.

The first roll screen 10 and the second roll screen 20 configured in this manner change the position of the screen 13 (specifically, the position in the front-rear direction) by changing the winding direction of the screen 13. be able to. Hereinafter, the first roll screen 10 is mentioned as an example, and it demonstrates concretely.

For example, as shown in FIG. 3A, the lower end (weight bar 14) of the screen 13 hangs down from the front side of the winding shaft 11 in the left side view (the screen 13 is positioned clockwise with respect to the winding shaft 11). When the winding shaft 11 is rotated counterclockwise in the left side view from the state in which the weight bar 14 is wound around the floor 3, the screen 13 is gradually pulled downward (FIG. 3(b)). (Fig. 3(c)). When the winding shaft 11 is further rotated counterclockwise to move the fixed position P backward, the screen 13 is also moved backward (FIGS. 3(d) to (f)).

In this way, the first roll screen 10 can change the position of the screen 13 (the position in the front-rear direction) by changing the way the screen 13 is wound (the direction of winding and the amount of winding). Specifically, by rotating the winding shaft 11 clockwise or counterclockwise on the left side, the position of the screen 13 can be arbitrarily changed within the width (front-rear width) of the winding shaft 11 . (See Figure 3).

Here, as shown in FIG. 3C, when the winding shaft 11 is further rotated counterclockwise from the state in which the weight bar 14 is in contact with the floor 3, the screen 13 is lowered (the screen 13 is lowered). Since the upper end (fixed position P) moves downward), the screen 13 may become slack between the winding shaft 11 and the floor 3 . However, in the present embodiment, the weight bar 14 is provided with a suppressing mechanism (the fixing portion 14a and the accommodating portion 14b) that suppresses the slack, thereby suppressing the occurrence of the slack. The suppression mechanism will be specifically described below.

As shown in FIG. 4A, until the weight bar 14 is grounded on the floor 3, the accommodation portion 14b is hooked to the fixed portion 14a fixed to the lower end portion of the screen 13 so that the accommodation portion 14b is attached to the screen 13. is hung on

As shown in FIG. 4B, when the screen 13 is further lowered while the weight bar 14 (accommodating portion 14b) is in contact with the floor 3, the fixed portion 14a moves inside the accommodating portion 14b by the amount of the screen 13 that has been lowered. Move down. In this manner, since the fixed portion 14a is allowed to move inside the accommodating portion 14b, the occurrence of slack in the screen 13 between the winding shaft 11 and the floor 3 can be suppressed.

In order to suppress such slack as much as possible, the fixed portion 14a is lowered by the distance L of the screen 13 (fixed position P) from the state where the weight bar 14 touches the ground until the screen 13 reaches the lowest state. It is desirable to appropriately set the shapes of the fixing portion 14a and the accommodating portion 14b (in particular, the vertical width of the fixing portion 14a and the vertical width of the inside of the accommodating portion 14b) so as to allow movement. That is, it is desirable to set the dimensions of the housing portion 14b and the like so that the fixing portion 14a can move in the housing portion 14b by the downward distance L or more.

As described above, the position of the screen 13 is changed using the first roll screen 10, but the position of the screen 13 can be changed in the same manner for the second roll screen 20 as well.

A method of using the sound insulation system 1 configured as described above will be described below.

As shown in FIG. 2, the sound insulation system 1 can form an air layer (air layer A) between the screens 13 by lowering the screens 13 of the first roll screen 10 and the second roll screen 20. can. By forming the air layer A between the screens 13 in this manner, an effect of blocking (insulating) noise from the outside of the window 2 can be expected.

Here, in general, in a structure having an air layer A (hollow layer) as in the present embodiment, resonance occurs with the air of the air layer A as a spring at a specific frequency, and sound insulation deteriorates. is known. It is also known that the frequency at which such resonance (resonant transmission phenomenon) occurs varies according to the width d of the air layer A (hollow layer).

Specifically, the larger the width d, the lower the frequency at which the resonance transmission phenomenon occurs, so that bass sounds are more likely to cause resonance. In other words, if the width d is increased, high-pitched noise can be effectively blocked.

Further, the smaller the width d, the higher the frequency at which the resonance transmission phenomenon occurs, so that high-pitched sounds are more likely to cause resonance. In other words, if the width d is made small, low-pitched noise can be effectively blocked.

Therefore, in this embodiment, the position of the screen 13 can be changed as described above, so that the width d of the air layer A can be changed, and the sound insulation performance of the sound insulation system 1 can be changed. . By changing the width d of the air layer A according to the type of noise, the noise can be effectively blocked.

FIG. 5 shows an example in which the width d of the air layer A is changed by changing the position of the screen 13 .

For example, in the example shown in FIG. 5A, the screen 13 of the first roll screen 10 is moved to the rearmost, and the screen 13 of the second roll screen 20 is moved to the front. In this state, the width d of the air layer A becomes maximum (dmax).

The example shown in FIG. 5B shows an example in which the screen 13 of the first roll screen 10 is moved to the frontmost position, and the screen 13 of the second roll screen 20 is moved to the rearmost position. In this state, the width d of the air layer A is the minimum (dmin).

In the examples shown in FIGS. 2 and 5(c), the screen 13 of the first roll screen 10 and the second roll screen 20 is moved most forward (FIG. 2) or most backward (FIG. 5(c)). shows an example. The width d of the air layer A in the states shown in FIGS. 2 and 5(c) is the same and is medium (dmax<d<dmin).

By changing the position of the screen 13 in this manner, the width d of the air layer A can be arbitrarily changed. By appropriately changing the width d according to the type of noise being generated, it is possible to change the sound insulation performance of the sound insulation system 1 and effectively block the noise. For example, during the daytime when relatively high-pitched sounds such as children's voices tend to become noise, the width d can be increased to effectively block high-pitched noise. In addition, in the night time period when relatively low-pitched sounds, such as the sound of running cars, tend to become noise, the width d can be reduced to effectively block low-pitched noise.

In addition, by providing the sound insulation system 1 near the window 2 as in this embodiment, it can be used not only for the purpose of sound insulation but also for the purpose of light blocking like a general roll screen. . Moreover, as in the present embodiment, the air layer A between the screens 13 can be expected to provide not only a sound insulation effect but also a heat insulation (insulation) effect.

In addition, as in the present embodiment, by providing the sound insulation system 1 so as to face the window 2, between the window 2 and the sound insulation system 1 (specifically, the screen 13 of the second roll screen 20) An air layer B (see FIG. 5) can be formed. As a result, not only the air layer A but also the air layer B can provide a sound insulation effect. Further, by changing the position of the screen 13 of the second roll screen 20, the width D of the air layer B can be changed. Thus, by changing not only the width d of the air layer A but also the width D of the air layer B, the sound insulation effect can be arbitrarily changed.

Moreover, as shown in FIG. 6, the screen 13 of the sound insulation system 1 can be used by being inclined with respect to the vertical direction. A specific description will be given below.

As shown in FIG. 6(a), from the state where the weight bar 14 of the second roll screen 20 is grounded, the winding shaft 11 is rotated counterclockwise in left side view. As a result, the upper end (fixed position P) of the screen 13 moves backward (FIG. 6(b)). In contrast, the weight bar 14 is held in place by the frictional force with the floor 3 . Therefore, the fixed position P moves rearward relative to the weight bar 14, and the upper end of the screen 13 tilts rearward.

By inclining the screen 13 of the second roll screen 20 in this way, the width d of the air layer A is not constant. That is, the width d of the air layer A differs depending on the height.

Here, the frequency at which resonance occurs is determined according to the width d of the air layer A, as described above. On the other hand, as shown in FIG. 6C, by inclining the screen 13, the width d varies depending on the height, so that the frequency at which the resonant transmission phenomenon occurs can be eliminated. That is, in such a state, resonance is unlikely to occur for noise of any sound range, and stable sound insulation can be obtained.

When the screen 13 is used with the screen 13 inclined in this way, the shape of the weight bar 14 and the It is desirable to appropriately select the material and the like. In addition, in FIG. 3 used in the above description, the friction (inclination of the screen 13) is not taken into consideration for simplification of description.

As described above, the sound insulation system 1 according to the present embodiment is
A first roll screen 10 comprising a first screen 13 and a first winding shaft 11 around which the first screen 13 is wound;
The second screen 13 is arranged on the side of the first winding shaft 11 and the second screen 13 is wound around the first screen 13 by changing the way the second screen 13 is wound. A second roll screen 20 comprising a second winding shaft 11 around which the second screen 13 is wound so that the position of the screen 13 can be changed;
is provided.
By configuring in this way, the sound insulation performance can be changed. That is, by changing the position of the screen 13 of the second roll screen 20 with respect to the screen 13 of the first roll screen 10, the width d of the air layer A formed between the two screens 13 can be changed. Accordingly, the sound insulation performance of the sound insulation system 1 can be arbitrarily changed.

In addition, the second roll screen 20 is
comprising a weight bar 14 provided at the lower end of the second screen 13,
The weight bar 14 is
It comprises a suppressing mechanism (fixing portion 14a and accommodating portion 14b) that suppresses the occurrence of slack in the second screen 13 when grounded.
By configuring in this way, it is possible to suppress the occurrence of slack in the second screen 13 . That is, even if the weight bar 14 touches the ground when changing the position of the screen 13 of the second roll screen 20, the screen 13 can be prevented from sagging. Thereby, the aesthetic appearance of the sound insulation system 1 can be maintained.

Further, the suppressing mechanism is
a fixing portion 14a fixed to the lower end portion of the second screen 13;
a housing portion 14b housing the fixing portion 14a so that the fixing portion 14a can move up and down;
is provided.
By configuring in this way, the suppressing mechanism can have a simple configuration.

In addition, the second roll screen 20 is
By rotating the second winding shaft 11 with the weight bar 14 grounded, the second screen 13 can be tilted with respect to the vertical direction.
By configuring in this way, the width between the screens 13 can be changed according to the height, and the occurrence of resonance can be effectively suppressed.

The winding shaft 11 and the screen 13 of the first roll screen 10 according to the present embodiment (and/or the winding shaft 11 and the screen 13 of the second roll screen 20) are the first winding shaft according to the present invention. Fig. 10 is an embodiment of the shaft and first screen;
Further, the winding shaft 11 and the screen 13 of the second roll screen 20 according to the present embodiment (and/or the winding shaft 11 and the screen 13 of the first roll screen 10) are the second winding shaft according to the present invention. Fig. 10 is an embodiment of the shaft and secondary screen;
Further, the fixing portion 14a and the accommodating portion 14b according to this embodiment are an embodiment of the suppressing mechanism according to the present invention.

Below, the configuration of a sound insulation system 1A according to another embodiment (second embodiment) of the present invention will be described with reference to FIG.

The difference between the sound insulation system 1A according to the second embodiment and the sound insulation system 1 according to the first embodiment is that the position of the screen 13 can be automatically changed. Specifically, the sound insulation system 1A according to the second embodiment differs from the sound insulation system 1 according to the first embodiment in that it includes an actuator 30, a microphone 40, and a controller 50. FIG. The difference will be specifically described below.

The actuator 30 generates driving force for rotating the winding shaft 11 . The actuator 30 is configured by, for example, a motor. One actuator 30 is connected to each of the winding shafts 11 of the first roll screen 10 and the second roll screen 20 . A driving force generated by the actuator 30 is transmitted to the winding shaft 11 via an appropriate power transmission member (gear, shaft, etc.). By controlling the operation of the actuator 30, the winding shaft 11 can be rotated in any direction.

The microphone 40 detects ambient sounds (especially noise). A microphone 40 is placed at an arbitrary location. For example, the microphone 40 is arranged near the window 2 (on the outdoor side or the indoor side of the window 2).

The controller 50 can control the operation of the actuator 30 . The control unit 50 includes storage units such as RAM, ROM, and HDD, arithmetic processing units such as CPU, and the like. Various information and programs for controlling the operation of the actuator 30 are stored in the control unit 50 .

The control unit 50 is connected to the microphone 40 and can acquire information about noise detected by the microphone 40 . Also, the controller 50 is connected to the actuator 30 and can control the operation of the actuator 30 .

In the sound insulation system 1</b>A configured in this manner, the position of the screen 13 can be automatically changed by controlling the operation of the actuator 30 with the control section 50 . For example, the control unit 50 can change the position of the screen 13 according to the current time. Specifically, the position of the screen 13 is changed so that the width d becomes large during the daytime hours when relatively high-pitched sounds such as children's voices tend to generate noise. Thereby, the sound insulation system 1A can effectively block noise in the high frequency range. In addition, the position of the screen 13 is changed so that the width d becomes smaller in the night time period when comparatively low-pitched sounds such as the sound of running cars tend to become noise. Thereby, the sound insulation system 1A can effectively block noise in the low frequency range.

The controller 50 can also automatically change the position of the screen 13 based on noise detected by the microphone 40 . For example, when relatively high-pitched noise is detected by the microphone 40, the control unit 50 changes the position of the screen 13 so that the width d increases. Thereby, the sound insulation system 1A can effectively block noise in the high frequency range. Further, when relatively low-pitched noise is detected by the microphone 40, the control unit 50 changes the position of the screen 13 so that the width d becomes smaller. Thereby, the sound insulation system 1A can effectively block noise in the low frequency range.

As described above, the sound insulation system 1A according to the second embodiment is
an actuator 30 that rotationally drives the second winding shaft 11;
a control unit 50 capable of controlling the operation of the actuator 30;
is further provided.
By configuring in this way, the sound insulation performance can be automatically changed. This can improve convenience.

In addition, the sound insulation system 1A is
further comprising a microphone 40 (detection unit) that detects ambient sound,
The control unit 50 is
The operation of the actuator 30 is controlled based on ambient sounds detected by the microphone 40 .
By configuring in this way, the sound insulation performance can be changed according to the noise. This can effectively block noise.

Although the embodiments according to the present invention have been described above, the present invention is not limited to the above configurations, and various modifications are possible within the scope of the invention described in the claims.

For example, in the above embodiment, both the screens 13 of the first roll screen 10 and the second roll screen 20 are configured to be movable back and forth. However, the present invention is not limited to this, and a configuration in which only one of the first roll screen 10 and the second roll screen 20, the screen 13, is movable back and forth is also possible. In this way, if at least one screen 13 of the first roll screen 10 and the second roll screen 20 is movable back and forth, the width d of the air layer A can be changed, and the sound insulation performance can be changed. can do.

Further, in the above-described embodiment, the first roll screen 10 and the second roll screen 20 are provided with the suppression mechanism (the fixed portion 14a and the storage portion 14b) that suppresses the slack of the screen 13, but the suppression mechanism is not necessarily provided. It does not have to be equipped.

Moreover, the control mode by the control unit 50 is not limited to the above embodiment, and the position of the screen 13 can be changed at any timing based on various information. Further, the control unit 50 can not only change the position of the screen 13 but also open and close it.

Further, in the above-described embodiment, an example in which the sound insulation system 1 (1A) is arranged so as to face the window 2 is shown, but the present invention is not limited to this, and may be arranged in any place as necessary. Is possible.

Further, in the above-described embodiment, as a method of using the sound insulation system 1 (1A), a method of use for the purpose of blocking noise (sound that affects human health and living environment) has been described. The present invention is not limited to this. That is, the sound insulation system 1 (1A) can be used to block not only noise (sounds that affect human health and living environment) but also various sounds (surrounding sounds) that need to be blocked. is. Also in the sound insulation system 1A according to the second embodiment, not only noise but also other sounds (surrounding sounds) can be detected by the microphone 40, and the position of the screen 13 can be changed based on the detection result.

Reference Signs List 1 sound insulation system 10 first roll screen 11 winding shaft 13 screen 14 weight bar 14a fixing part 14b housing part 20 second roll screen 30 actuator 40 microphone 50 control part

Claims (6)

a first roll screen comprising a first screen and a first winding shaft around which the first screen is wound;
a second screen, and a position of the second screen with respect to the first screen, which is arranged on the side of the first winding shaft and is changed by changing the winding method of the second screen. a second roll screen comprising a second winding shaft around which the second screen is variably wound;
and
The second roll screen is
comprising a weight bar provided at the lower end of the second screen,
The weight bar is
Equipped with a suppression mechanism that suppresses the occurrence of slack in the second screen when grounded,
The second roll screen is
By rotating the second winding shaft while the weight bar is grounded, the second screen can be tilted with respect to the vertical direction.
sound insulation system. a first roll screen comprising a first screen and a first winding shaft around which the first screen is wound;
a second screen, and a position of the second screen with respect to the first screen, which is arranged on the side of the first winding shaft and is changed by changing the winding method of the second screen. a second roll screen comprising a second winding shaft around which the second screen is variably wound;
an actuator that rotationally drives the second winding shaft;
a control unit capable of controlling the operation of the actuator;
a detection unit that detects ambient sound;
and
The control unit
controlling the operation of the actuator based on the ambient sound detected by the detection unit;
sound insulation system. The second roll screen is
comprising a weight bar provided at the lower end of the second screen,
The weight bar is
Equipped with a suppression mechanism that suppresses the occurrence of slack in the second screen when grounded,
Sound insulation system according to claim 2. The suppression mechanism is
a fixing part fixed to the lower end of the second screen;
an accommodating portion that accommodates the fixing portion so that the fixing portion can move up and down;
comprising a
4. A sound insulation system according to claim 1 or claim 3. an actuator that rotationally drives the second winding shaft;
a control unit capable of controlling the operation of the actuator;
further comprising
The sound insulation system of claim 1 . further comprising a detection unit that detects ambient sound,
The control unit
controlling the operation of the actuator based on the ambient sound detected by the detection unit;
Sound insulation system according to claim 5.

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