Rotating brush for suction tools, suction tools, and electric vacuum cleaners

Abstract

The present invention provides a rotating brush for a suction device, a suction device, and a vacuum cleaner that can achieve good cleaning performance on both floors and carpets. [Solution] The present invention provides a rotating brush 23 for a suction device, comprising a rotating shaft portion 33 and a brush portion 34 provided around the rotating shaft portion 33. The brush portion 34 has a base fabric 41 and a plurality of fiber bundles 42 provided on its surface by raising the nap. The fiber bundles 42 have a first cut pile yarn 42a made of monofilament and a second cut pile yarn 42b made of multifilament. The first cut pile yarn 42a is exposed from the napped surface of the second cut pile yarn 42b, or has the same pile height as the napped surface. The ratio of the pile height of the second cut pile yarn 42b to the pile height of the first cut pile yarn 42a is 0.6 to 1, the fiber diameter of the monofilament is 60 to 300 μm, and the single filament fineness of the multifilament is 0.01 to 30 dtex.

Description

[Technical Field]

[0001] This invention relates to a rotating brush for a suction device, a suction device, and an electric vacuum cleaner. [Background technology]

[0002] Conventional electric vacuum cleaners, for example, consist of a main unit and a suction attachment connected to the main unit via a connecting pipe. The suction attachment houses a rotating brush that can be rotated, and removes dust and other particles by sucking in air from a suction port located on the bottom of the suction attachment.

[0003] As an example of such a vacuum cleaner, Patent Document 1 discloses one equipped with a rotating brush in which a pile fabric is wrapped around the circumferential surface of a rotating body. The pile fabric is woven on a base fabric in such a way that at least one of a plurality of first pile threads and a plurality of second pile threads that are softer than the first pile threads is erected. Patent Document 1 states that this makes the structure simpler than that of conventional rotating brushes.

[0004] Furthermore, Patent Document 2 discloses a vacuum cleaner having a rotating brush comprising a shaft rotatably mounted inside the suction port body and a cleaning material provided around the shaft. The cleaning material comprises a plurality of soft brushes provided at a predetermined central angle in the circumferential direction around the axis of the shaft and extending in the axial direction, and one or more hard brushes provided between the plurality of soft brushes and extending in the axial direction. The soft brushes contain crimped fibers, and the hard brushes contain straight fibers that are more rigid than the soft brushes, and the height of the hard brushes in the radial direction of rotation is configured to be lower than the height of the plurality of soft brushes in the radial direction of rotation. According to Patent Document 2, by providing a rotating brush with such a structure, the dust removal performance on the surface to be cleaned can be improved.

[0005] Furthermore, Patent Document 3 discloses a vacuum cleaner equipped with a brush bar having a central core in the form of a high-rigidity tube, a plurality of bristles extending outward in the form of at least one bristle strip, and a sealing material extending over substantially the entire circumferential and axial length of the brush bar. The bristle strip is inserted between the sealing material and the central core, or attached to the top of the sealing material, and has a base portion. According to Patent Document 3, it is possible to reduce manufacturing costs by adopting a brush bar with such a structure. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2016-158779 [Patent Document 2] Japanese Patent Publication No. 2022-177601 [Patent Document 3] Special Publication No. 2022-501131 [Overview of the project] [Problems that the invention aims to solve]

[0007] However, in all of the rotating brushes described in Patent Documents 1 to 3, the stiffness of the soft bristles is too low, resulting in insufficient pressure against the surface being cleaned. As a result, when the surface being cleaned is a floor, wiping becomes difficult. Furthermore, continued use causes the bristles to flatten, leading to a decrease in cleaning performance. Hard bristles generally function to scrape and remove dust and other debris when the surface being cleaned is a carpet, but the stiffness of the rotating brushes described in Patent Documents 1 to 3 is not sufficient. Therefore, it is necessary to increase the stiffness of the hard bristles to improve cleaning performance on carpets, but increasing the stiffness too much can damage the floor surface.

[0008] The present invention has been made in view of the above-mentioned problems, and its objective is to provide a rotating brush for a suction device, a suction device, and an electric vacuum cleaner that can achieve good cleaning performance on both floors and carpets. [Means for solving the problem]

[0009] The rotating brush for a suction device according to the present invention solves the above problem by being rotatably attached to the suction device of an electric vacuum cleaner and comprising a rotating shaft portion and a brush portion provided on the outer circumference of the rotating shaft portion, wherein the brush portion has a base fabric and a plurality of fiber bundles provided on the surface of the base fabric by raising the nap, the fiber bundles have a first cut pile yarn made of monofilament and a second cut pile yarn made of multifilament, and the first cut pile yarn is such that the second cut pile yarn stands upright The material is characterized in that it is exposed from the napped surface formed by the material, or has the same pile height as the napped surface, the ratio of the pile height of the second cut pile yarn to the pile height of the first cut pile yarn is in the range of 0.6 or more and 1 or less, the fiber diameter of the monofilament is in the range of 60 μm or more and 300 μm or less, the fiber diameter of the monofilament is in the range of 60 μm or more and 300 μm or less, and the single filament fineness of the multifilament is in the range of 0.01 dtex or more and 30 dtex or less.

[0010] In the above configuration, a fiber bundle containing a first cut pile yarn made of monofilament and a second cut pile yarn made of multifilament is napped from the surface of the base fabric. The monofilament is composed of thick single fibers with a fiber diameter of 60 μm or more and 300 μm or less. The multifilament is composed of multiple fibers with a single filament fineness of 0.01 dtex or more and 30 dtex or less, and is finer than the monofilament. Therefore, in the above configuration, the rigidity of the first cut pile yarn is greater than that of the second cut pile yarn. In addition, in the above configuration, the pile height of the second cut pile yarn is set to a range of 0.6 or more and 1 or less relative to the pile height of the first cut pile yarn, so that the first cut pile yarn is exposed from the napped surface of the second cut pile yarn, or the pile height of the first cut pile yarn is made the same as the height of the napped surface. As a result, the first cut pile yarn is supported by the second cut pile yarn, and can be brought into stronger contact with the surface to be cleaned than the second cut pile yarn. For example, if the surface to be cleaned is a carpet, dust and other debris can be knocked out and scraped away during cleaning. Furthermore, the pressure on the second cut pile yarn from the surface to be cleaned is reduced, which can suppress or reduce the occurrence of flattening of the second cut pile yarn. Moreover, if the surface to be cleaned is a floor, it becomes possible to clean by wiping with the second cut pile yarn while preventing damage to the floor surface by the first cut pile yarn. In addition, in the above configuration, since the second cut pile yarn is thinner than the first cut pile yarn, even if there are fine irregularities on the floor surface, the second cut pile yarn can penetrate into the recesses, and dirt can be removed effectively. In other words, with the rotating brush configured as described above, it can clean floors by wiping them, while cleaning carpets by beating out and scraping away dust and other debris, thus providing excellent cleaning performance on both floors and carpets.

[0011] In the above configuration, it is preferable that each fiber bundle contains a mixture of the first cut pile yarn and the second cut pile yarn.

[0012] In the aforementioned configuration, it is preferable that at least one or more of the strip-shaped brush portions are adhered to the outer peripheral surface of the rotary shaft portion.

[0013] In the aforementioned configuration, it is preferable that the plurality of strip-shaped brush portions are provided extending in the axial direction of the rotary shaft portion in a state of being spaced apart from each other.

[0014] In the aforementioned configuration, the multifilament is composed of a crimped yarn, and the crimp rate of the crimped yarn is preferably in the range of 1% to 60%. By using a multifilament made of a crimped yarn with a crimp rate of 1% or more, the contact area of the second cut pile yarn with the surface to be cleaned can be increased. Thereby, the cleaning performance can be improved. On the other hand, by using a multifilament made of a crimped yarn with a crimp rate of 60% or less, it is possible to suppress an excessive decrease in the slipperiness relative to the surface to be cleaned such as a floor surface.

[0015] Further, in the aforementioned configuration, the total fineness of the first cut pile yarn in the fiber bundle is in the range of 40 dtex to 1000 dtex, the total fineness of the second cut pile yarn in the fiber bundle is in the range of 100 dtex to 2200 dtex, and the ratio of the total fineness of the second cut pile yarn to the total fineness of the first cut pile yarn is preferably in the range of 0.3 times to 20 times. Thereby, it is possible to provide a rotary brush capable of exhibiting good cleaning performance for both floor surfaces and carpets.

[0016] Further, in the aforementioned configuration, the bundle density of the fiber bundles is 500 bundles / inch 2 or more and 3500 bundles / inch 2 or less. By setting the bundle density of the fiber bundles to 500 bundles / inch 2 or more, good cleaning performance can be maintained. On the other hand, by setting the bundle density of the fiber bundles to 3500 bundles / inch 2By the following arrangement, it is possible to suppress an excessive increase in the contact area between the first cut pile yarn and the second cut pile yarn and the surface to be cleaned, and maintain good slipperiness.

[0017] In the above configuration, it is preferable that the second cut pile yarn is opened. Thereby, the wiping effect of the second cut pile yarn on the surface to be cleaned can be further improved. In addition, the performance of collecting dust and the like can also be improved.

[0018] To solve the above problem, a suction tool according to the present invention is characterized by being provided with the aforementioned rotary brush for a suction tool. Thereby, it is possible to provide a suction tool having excellent cleaning performance for both floor surfaces and carpets.

[0019] Further, to solve the above problem, an electric vacuum cleaner according to the present invention is characterized by being provided with the aforementioned suction tool. Thereby, it is possible to provide an electric vacuum cleaner having excellent cleaning performance for both floor surfaces and carpets. Effects of the Invention

[0020] According to the present invention, it is possible to provide a rotary brush for a suction tool, a suction tool, and an electric vacuum cleaner that can exhibit excellent cleaning performance even when the surface to be cleaned is a smooth surface such as a floor surface or a woven fabric surface such as a carpet. Brief Description of the Drawings

[0021] [Figure 1] This is a schematic cross-sectional view showing the electric vacuum cleaner according to the first embodiment of the present invention. [Figure 2] This is a cross-sectional view showing the suction tool in the electric vacuum cleaner according to the first embodiment of the present invention. [Figure 3] This is a schematic side view of the rotary brush of the suction tool in the electric vacuum cleaner according to the first embodiment of the present invention. [Figure 4] This is a schematic cross-sectional view showing the rotary brush of the suction tool in the electric vacuum cleaner according to the first embodiment of the present invention. [Figure 5]This is an enlarged schematic cross-sectional view showing the brush portion of the rotating brush in a vacuum cleaner according to the first embodiment of the present invention. [Figure 6] This is a schematic side view showing the rotating brush of the suction attachment in a vacuum cleaner according to a second embodiment of the present invention. [Figure 7] This is a schematic cross-sectional view of the rotating brush of the suction attachment in a vacuum cleaner according to a second embodiment of the present invention. [Modes for carrying out the invention]

[0022] (First Embodiment) A vacuum cleaner according to the first embodiment of the present invention will be described below with reference to the drawings. As shown in Figure 1, the vacuum cleaner 1 of this embodiment comprises a vacuum cleaner body 11, a connecting part 12, and a suction attachment 13. Figure 1 is a perspective view showing the vacuum cleaner 1 according to the first embodiment.

[0023] The vacuum cleaner body 11 contains a dust collection unit for collecting dust and other debris, an electric blower for applying negative pressure to the dust collection unit, and a control unit for controlling the electric blower, etc. (none of which are shown in the figures).

[0024] The connecting section 12 is made up of a pipe-shaped extension tube. One end of the connecting section 12 is detachably connected to the suction port of the vacuum cleaner body 11. The other end of the connecting section 12 is detachably connected to the suction attachment 13.

[0025] As shown in Figure 2, the suction device 13 includes a suction device body 21 made of a case. Figure 2 is a cross-sectional view of the suction device 13 of this embodiment. The suction device body 21 includes a suction port 22, a rotating brush for the suction device (hereinafter referred to as "rotating brush") 23, a rotating brush storage chamber 24, and a motor for the rotating brush 25. In addition, a first receiving portion 28 and a second receiving portion 29 are provided on the inner surface of the suction device body 21.

[0026] The suction port 22 is located at the bottom of the suction tool body 21 and has a horizontally elongated shape extending in the left-right direction as indicated by arrow X in Figure 2. This suction port 22 enables the suction of dust and other particles from surfaces to be cleaned, such as floors, tatami mats, and carpets. The rotating brush storage chamber 24 is located inside the suction tool body 21. The rotating brush storage chamber 24 rotatably houses the rotating brush 23. The rotating brush storage chamber 24 is also provided with an air intake port 26. The rotating brush motor 25 rotates the rotating brush 23. Rotational drive by the rotating brush motor 25 is possible, for example, by transmitting the driving force to the rotating brush 23 via an endless belt 27. Between the inside of the suction tool body 21 and the connection part 12, a suction air passage is formed in the front-rear direction (indicated by arrow Y in Figure 3) via the air intake port 26. One end of this suction air passage is the suction port 22. Furthermore, the other end of the suction air passage is the connection port on the other end of the connection part 12. By connecting the suction device body 21 to the connection part 12, dust and other particles can be sucked up through the suction air passage to the suction port 22.

[0027] As shown in Figure 3, the rotating brush 23 comprises a brush body 31 and a first rotation support portion 32a and a second rotation support portion 32b attached to both axial ends of the brush body 31. Figure 3 is a schematic side view of the rotating brush 23 of this embodiment.

[0028] As shown in Figures 3 and 4, the brush body 31 of the rotating brush 23 comprises a rotating shaft portion 33, a strip-shaped brush portion 34 that is spirally wound around the outer surface of the rotating shaft portion 33 so as to cover it without any gaps, and an adhesive layer 35 that adheres the brush portion 34 to the outer surface of the rotating shaft portion 33. Figure 4 is a schematic cross-sectional view of the rotating brush 23 of this embodiment.

[0029] The rotating shaft portion 33 is cylindrical and is formed of, for example, metal or synthetic resin. The adhesive layer 35 is formed of a known adhesive or double-sided adhesive tape.

[0030] As shown in Figure 5, the brush portion 34 comprises at least a base fabric 41, a plurality of fiber bundles 42 provided on the surface of the base fabric 41 in a napped state, and a back coat layer 43 provided on the back surface of the base fabric 41. The surface of the base fabric 41 refers to the surface on which the fiber bundles 42 are napped and standing upright, and the back surface of the base fabric 41 refers to the surface opposite to the surface on which the fiber bundles 42 are napped and standing upright. Figure 5 is an enlarged schematic cross-sectional view of the brush portion 34 in the rotating brush 23 according to this embodiment.

[0031] The base fabric 41 is formed from a woven fabric obtained by weaving warp threads 44 and weft threads 45. The weaving structure of the warp threads 44 and weft threads 45 is not particularly limited and can be plain weave, twill weave, satin weave, leno weave, or variations thereof. "Weaving structure" means the pattern of how the warp threads 44 and weft threads 45 are woven. "Plain weave" means a woven fabric structure in which each weft thread 45 alternately passes above and below the warp threads 44, as shown in Figure 5. "Twill weave" means a woven fabric structure (or weaving method) in which the warp threads are woven so that two (or three) warp threads pass above the weft threads and one warp thread passes below the weft threads. "Satin weave" means a woven fabric structure (or weaving method) in which five or more warp threads and five or more weft threads form a complete structure, and the points of intersection are at regular intervals and are not adjacent. "Gleam weave" refers to a coarse fabric structure (or weaving method) in which two warp threads are twisted together and woven with the weft threads. Furthermore, "variations of these structures" refers to plain weave, twill weave, satin weave, and / or leno weave in which some of the weaving methods have been modified.

[0032] The warp threads 44 and weft threads 45 may be spun yarn (i.e., yarn manufactured by bundling and twisting short fibers with short fiber lengths), monofilament yarn, multifilament yarn composed of bundles of multiple monofilament yarns, plywood, or plied yarn, respectively.

[0033] The constituent materials of the warp threads 44 and weft threads 45 are not particularly limited. Examples include synthetic fibers such as nylon® fibers, aramid fibers, and other polyamide fibers; polyester fibers such as polyethylene terephthalate fibers and polyarylate fibers; acrylic fibers such as polyacrylonitrile fibers; polyolefin fibers such as polyethylene fibers and polypropylene fibers; and fluorine fibers such as polytetrafluoroethylene fibers. It also includes regenerated fibers such as rayon fibers and cupro fibers, and semi-synthetic fibers such as acetate fibers and triacetate fibers. Furthermore, natural fibers such as hemp, cotton, and wool are also included. The warp threads 44 and weft threads 45 may be made from only one type of synthetic fiber, regenerated fiber, semi-synthetic fiber, or natural fiber as exemplified, or from a blend of at least two types.

[0034] The total fineness of the warp threads 44 and weft threads 45 is preferably in the range of 100 dtex or more and 2000 dtex or less, and more preferably in the range of 140 dtex or more and 1200 dtex or less. By setting the total fineness to 100 dtex or more, the rigidity of the warp threads 44 and weft threads 45 can be well maintained, and a decrease in the mechanical strength of the base fabric 41 can be prevented. As a result, the good shape retention of the base fabric 41 can be maintained, and the base portion of the fiber bundle 42 can be tightened. On the other hand, by setting the total fineness to 2000 dtex or less, the thickness of the base fabric 41 can be prevented from becoming excessively large, and flexibility can be maintained. As a result, even when it comes into contact with the outer surface of the rotating shaft portion 33, it can follow its shape well.

[0035] In this specification, the "total fineness" of the warp threads 44 and weft threads 45 refers to the total fineness of the threads constituting the weave structure units in the warp or weft direction of the fabric. When the smallest unit of the weave structure consists of a single thread such as a monofilament, it refers to the fineness of that single thread. When it consists of twisted yarns (multifilament yarns), plywoods, or combined yarns, it refers to the sum of the fineness of the constituent threads. Furthermore, when the smallest unit of the weave structure consists of spun yarn, the numerical range of the total fineness of the warp threads 44 and weft threads 45 is expressed as a value obtained by converting the "count," a unit representing the thickness of the spun yarn, to the SI unit "dtex" using a known conversion method. In addition, the total fineness (dtex) is expressed as the weight (g) of individual single yarns per 10,000 m and is obtained by a method compliant with JIS L1013 (2010).

[0036] Furthermore, when the warp threads 44 and weft threads 45 are made of multifilament yarn, the single-fiber fineness is preferably in the range of 0.5 dtex or more and 100 dtex or less, more preferably in the range of 2 dtex or more and 30 dtex or less, and even more preferably in the range of 6 dtex or more and 10 dtex or less. By setting the single-fiber fineness to 0.5 dtex or more, the rigidity of the warp threads 44 and weft threads 45 can be well maintained, and a decrease in the mechanical strength of the base fabric 41 can be prevented. As a result, the good shape retention of the base fabric 41 can be maintained, and the base portion of the fiber bundle 42 can be tightened. On the other hand, by setting the single-fiber fineness to 100 dtex or less, the thickness of the base fabric 41 can be prevented from becoming excessively thick, and flexibility can be maintained. As a result, for example, even when the brush portion 34 of this embodiment is brought into contact with the outer circumferential surface of the rotating shaft portion 33, it can follow its shape well. In this specification, "single yarn fineness" is the value obtained by dividing the total fineness obtained in accordance with JIS L1013 (2010) by the number of single yarns.

[0037] In this embodiment, the base fabric 41 is described using a woven fabric obtained by weaving warp threads 44 and weft threads 45 as an example, but the present invention is not limited to this embodiment. For example, the base fabric 41 may be a knitted fabric consisting only of weft threads. The knitting structure when the base fabric 41 is a knitted fabric is not particularly limited, and examples include circular knitting and weft knitting. The weft thread used when the base fabric 41 is a knitted fabric is not particularly limited, and for example, the same as the warp threads 44 and weft threads 45 described above can be used.

[0038] The fiber bundles 42 are portions that protrude upward from each weave of the base fabric 41, and the spacing between the fibers constituting the fiber bundles 42 is widened, resulting in a napped surface. The fiber bundles 42 include first cut pile yarns 42a and second cut pile yarns 42b, and are composed of a mixture of these. The first cut pile yarns 42a are monofilaments composed of a single filament yarn (long fiber yarn) and have the function of scraping off dust and other debris from the surface to be cleaned. By using monofilaments as the first cut pile yarns 42a, the rigidity of the first cut pile yarns 42a can be maintained well, and the occurrence of nap flattening of the first cut pile yarns 42a and second cut pile yarns 42b can be suppressed or reduced. The second cut pile yarns 42b are multifilament yarns composed of bundles of multiple filament yarns (long fiber yarns) and have the function of capturing and wiping off dust and other debris from the surface to be cleaned. It is preferable that the multiple filament yarns constituting the second cut pile yarn 42b are split. This further improves the wiping effect of the second cut pile yarn 42b on the surface to be cleaned. It also improves the dust and other debris collection performance. The degree of splitting is not particularly limited and can be set as appropriate. In this embodiment, the first cut pile yarn 42a and the second cut pile yarn 42b do not include loop pile yarn configurations. By making the first cut pile yarn 42a and the second cut pile yarn 42b cut pile yarn configurations, it is possible to easily remove collected debris during cleaning. In addition, even if there are protrusions on the floor surface, it is possible to prevent the first cut pile yarn 42a and the second cut pile yarn 42b from getting caught on such protrusions, thereby suppressing a decrease in slipperiness.

[0039] In this embodiment, the fiber bundle 42 is woven into the base fabric 41 using a so-called W weave. That is, as shown in Figure 5, the fiber bundle 42, which consists of a combined yarn including a first cut pile yarn 42a and a second cut pile yarn 42b, is woven into the base fabric 41 by first passing under one weft yarn 45, then over the adjacent weft yarn 45, and then passing under the next adjacent weft yarn 45. In other words, the fiber bundle 42 is woven into the base fabric 41 in a W weave, forming a W shape across the three weft yarns 45. In addition to the W weave, the weaving method for the fiber bundle 42 may also be a V weave, in which the fiber bundle 42 is raised against the base fabric 41 in an inclined state, or a U weave, in which the fiber bundle 42 is raised in a direction approximately perpendicular to the base fabric 41.

[0040] Examples of the first cut pile yarn 42a include straight yarn, slanted yarn, or crimped yarn (false-twisted yarn). Of these, in this embodiment, straight yarn is preferred from the viewpoint of pressure when in contact with a floor surface, etc. Examples of the second cut pile yarn 42b include straight yarn, slanted yarn, or crimped yarn (false-twisted yarn). Of these, in this embodiment, crimped yarn is preferred. By using crimped yarn, for example, compared to using straight yarn, the dust collection performance can be improved without increasing the number of second cut pile yarns 42b per unit area. In the case of crimped yarn, it is obtained by twisting the yarn while heating it, and then twisting it in the opposite direction.

[0041] When the second cut pile yarn 42b (multifilament) is a crimped yarn, its crimping rate is preferably in the range of 1% or more and 60% or less, more preferably in the range of 1% or more and 50% or less, even more preferably in the range of 5% or more and 40% or less, and particularly preferably in the range of 10% or more and 20% or less. By setting the crimping rate of the multifilament to 1% or more, the contact area of ​​the second cut pile yarn 42b with the surface to be cleaned, such as a floor, can be maintained well. This allows for good cleanability to be maintained. On the other hand, by setting the crimping rate of the multifilament to 60% or less, it is possible to suppress an excessive decrease in slipperiness with respect to the surface to be cleaned, such as a floor.

[0042] In this specification, "crimp ratio" can be obtained, for example, by the following method. That is, the crimp ratio is calculated based on the length L1 (mm) when an initial load of 0.18 mN × the number of tex values ​​is applied to the sample, and the length L2 (mm) when a load of 4.41 mN × the number of tex values ​​is applied. The length is measured immediately after applying the load, or 30 seconds after applying the load if synthetic resin is used. After measuring the length, the crimp ratio is calculated based on the following formula. Crimp rate (%)=(L2-L1) / L2×100

[0043] The fiber diameter of the first cut pile yarn 42a (monofilament) is in the range of 60 μm or more and 300 μm or less, preferably in the range of 80 μm or more and 250 μm or less, and more preferably in the range of 100 μm or more and 200 μm or less. By making the fiber diameter of the monofilament 60 μm or more, the mechanical strength of the first cut pile yarn 42a can be maintained well, and the occurrence of pile collapse of the first cut pile yarn 42a can be suppressed or reduced. On the other hand, by making the fiber diameter of the monofilament 300 μm or less, the pressure of the first cut pile yarn 42a on the floor surface etc. becomes large, which suppresses excessive slipperiness. As a result, good contact of the second cut pile yarn 42b on the floor surface etc. can be maintained, and excellent cleanability can be maintained. In addition, damage to the floor surface can be reduced.

[0044] The single-fiber fineness of the first cut pile yarn 42a (monofilament) is in the range of 40 dtex or more and 1000 dtex or less, preferably in the range of 70 dtex or more and 430 dtex or less, and more preferably in the range of 100 dtex or more and 360 dtex or less. By setting the single-fiber fineness of the monofilament to 40 dtex or more, the mechanical strength of the first cut pile yarn 42a can be maintained well, and the occurrence of pile flattening of the first cut pile yarn 42a can be reduced or suppressed. In addition, the contact area of ​​the first cut pile yarn 42a with the surface to be cleaned can be maintained well, and a decrease in cleanability can be prevented. On the other hand, by setting the single-fiber fineness of the monofilament to 1000 dtex or less, it is possible to suppress the contact area of ​​the first cut pile yarn 42a with the floor surface etc. from becoming excessively large, and damage to the floor surface can be reduced.

[0045] The single-fiber fineness (filament fineness) of the second cut pile yarn 42b (multifilament) is in the range of 0.01 dtex or more and 30 dtex or less, preferably in the range of 0.3 dtex or more and 13 dtex or less, more preferably in the range of 0.3 dtex or more and 7 dtex or less, and even more preferably in the range of 2 dtex or more and 5 dtex or less. By setting the single-fiber fineness of the multifilament to 0.01 dtex or more, the mechanical strength of the second cut pile yarn 42b can be well maintained, and the occurrence of pile collapse of the second cut pile yarn 42b can be reduced or suppressed. In addition, the contact area of ​​the second cut pile yarn 42b with the surface to be cleaned can be well maintained, and a decrease in cleanability can be prevented. On the other hand, by setting the single-fiber fineness of the multifilament to 30 dtex or less, it is possible to suppress the contact area of ​​the second cut pile yarn 42b with the floor surface etc. from becoming excessively large, and damage to the floor surface can be reduced.

[0046] The first cut pile yarn 42a is exposed from the napped surface formed by the erection of the second cut pile yarn 42b against the base fabric 41. Alternatively, the pile height of the first cut pile yarn 42a may be the same as the height of the napped surface of the second cut pile yarn 42b. The ratio of the pile height of the second cut pile yarn 42b to the pile height of the first cut pile yarn 42a (pile height ratio) is in the range of 0.6 or more and 1 or less, preferably in the range of 0.7 or more and 0.9 or less, and more preferably in the range of 0.75 or more and 0.8 or less. Note that pile height refers to the distance from the base fabric 41 to the tip of the first cut pile yarn 42a or the second cut pile yarn 42b. By setting the pile height ratio to 1 or less, the first cut pile yarn 42a is exposed from the napped surface of the second cut pile yarn 42b, or the pile height of the first cut pile yarn 42a is made the same as the height of the napped surface. This allows the first cut pile yarn 42a to receive stronger pressure from the cleaning surface than the second cut pile yarn 42b during cleaning. In other words, by reducing the pressure on the second cut pile yarn 42b from the cleaning surface, the occurrence of flattening of the second cut pile yarn can be suppressed or reduced. Furthermore, since the first cut pile yarn 42a is supported by the second cut pile yarn 42b when it comes into contact with the cleaning surface, the beating effect and scraping force of dust and other debris can be improved even when the cleaning surface is a carpet. On the other hand, by setting the pile height ratio to 0.6 or more, it is possible to suppress an excessive decrease in the friction of the second cut pile yarn 42b against the cleaning surface during cleaning. As a result, for example, when the surface to be cleaned is a floor, the cleaning performance by wiping with the second cut pile yarn 42b can be maintained well. In addition, excessive contact of the first cut pile yarn 42a with the surface to be cleaned is suppressed, so when the surface to be cleaned is a floor, the occurrence of scratches can also be reduced.

[0047] The pile height of the first cut pile yarn 42a (or, if the first cut pile yarn 42a is a crimped yarn, the pile height in the crimped state) is preferably within the range of 3 mm to 20 mm, more preferably within the range of 4 mm to 15 mm, and even more preferably within the range of 5 mm to 10 mm, within the numerical range of the pile height ratio mentioned above. By setting the pile height of the first cut pile yarn 42a to 3 mm or more, the cleanability of the first cut pile yarn 42a can be maintained well. On the other hand, by setting the pile height of the first cut pile yarn 42a to 20 mm or less, it is possible to prevent the rigidity of the first cut pile yarn 42a from decreasing excessively, which would reduce the cleanability. Furthermore, if there are multiple first cut pile yarns 42a in the fiber bundle 42, it is preferable that the height of each first cut pile yarn 42a is uniform.

[0048] The pile height of the second cut pile yarn 42b (or, if the second cut pile yarn 42b is a crimped yarn, the pile height in the crimped state) is preferably within the range of 3 mm to 20 mm, more preferably within the range of 4 mm to 15 mm, and even more preferably within the range of 5 mm to 10 mm, within the numerical range of the pile height ratio mentioned above. By setting the pile height of the second cut pile yarn 42b to 3 mm or more, the cleanability of the second cut pile yarn 42b can be maintained well. On the other hand, by setting the pile height of the second cut pile yarn 42b to 20 mm or less, it is possible to prevent the rigidity of the second cut pile yarn 42b from decreasing excessively, which would reduce the cleanability. Furthermore, it is preferable that the height of the filament yarns constituting the second cut pile yarn 42b is uniform. Furthermore, if the second cut pile yarn 42b is made of crimped yarn, the pile length of the second cut pile yarn 42b (i.e., the length from the base fabric 41 to the tip when the second cut pile yarn 42b is stretched) can be appropriately set according to the set pile height and crimping ratio of the second cut pile yarn 42b.

[0049] The ratio of the total fineness of the second cut pile yarn 42b in the fiber bundle 42 to the total fineness of the first cut pile yarn 42a in the fiber bundle 42 (total fineness ratio) is preferably in the range of 0.3 times or more and 20 times or less, more preferably in the range of 0.3 times or more and 9 times or less, and even more preferably in the range of 0.7 times or more and 5 times or less. By setting the total fineness ratio to 0.3 times or more, good cleaning performance can be maintained. On the other hand, by setting the total fineness ratio to 20 times or less, the number of second cut pile yarns 42b that come into contact with the surface to be cleaned can be suppressed, thereby preventing a decrease in the cleaning performance of the rotating brush 23.

[0050] Here, the total fineness within the fiber bundle 42 of the first cut pile yarn 42a refers to the sum of the fineness of the first cut pile yarn 42a (monofilaments) present in one fiber bundle 42. For example, if the fineness of the first cut pile yarn 42a is 40 dtex and the number of filaments is 2, the total fineness within the fiber bundle 42 of the first cut pile yarn 42a will be 40 dtex × 2 = 80 dtex. The total fineness within one fiber bundle 42 of the first cut pile yarn 42a is preferably in the range of 40 dtex or more and 1000 dtex or less, more preferably in the range of 70 dtex or more and 700 dtex or less, and even more preferably in the range of 90 dtex or more and 450 dtex or less, within the numerical range of the total fineness ratio mentioned above. By setting the total fineness of the first cut pile yarn 42a within the fiber bundle 42 to 40 dtex or more, the first cut pile yarn 42a maintains a gap with the floor surface, preventing excessive friction between the second cut pile yarn 42b and the surface to be cleaned, thus enabling cleaning with less friction load. On the other hand, by setting the total fineness of the first cut pile yarn 42a within the fiber bundle 42 to 1000 dtex or less, the second cut pile yarn 42b contacts the surface to be cleaned with appropriate pressure, enabling high cleaning power.

[0051] The number of filaments (or the number of monofilaments) of the first cut pile yarn 42a (monofilament) in one fiber bundle 42 is preferably in the range of 1 to 20, more preferably in the range of 1 to 10, and even more preferably in the range of 1 to 5. By setting the number of monofilament filaments to 1 or more, good cleaning performance can be maintained. On the other hand, by setting the number of monofilament filaments to 20 or less, cleaning with low frictional load can be achieved. In this specification, "the number of monofilament filaments" means the number of monofilaments contained in one fiber bundle 42.

[0052] The filament count density of the first cut pile yarn 42a is 0.5kF / inch 2 or more, 70kF / inch 2 or less, which is preferred, and 0.75kF / inch 2 or more, 25kF / inch 2 or less, which is more preferred, and 1kF / inch 2 or more, 10kF / inch 2 or less, which is even more preferred. By setting the filament count density to 0.5kF / inch 2 or more, high cleaning performance can be exhibited. On the other hand, by setting the filament count density to 70kF / inch 2 or less, the frictional load can be reduced.

[0053] Furthermore, the total fineness of the second cut pile yarn 42b within the fiber bundle 42 refers to the sum of the fineness of the second cut pile yarn 42b (multifilament) present within one fiber bundle 42. For example, if the single-ply fineness of the second cut pile yarn 42b is 3.5 dtex and the number of filaments in the filament yarn constituting the second cut pile yarn 42b is 96, then the total fineness will be 3.5 dtex × 96 = 336 dtex. The total fineness of the second cut pile yarn 42b within the fiber bundle 42 is preferably in the range of 100 dtex or more and 2200 dtex or less, more preferably in the range of 200 dtex or more and 900 dtex or less, and even more preferably in the range of 300 dtex or more and 500 dtex or less, within the numerical range of the total fineness ratio mentioned above. By making the total fineness of the second cut pile yarn 42b within the fiber bundle 42 100 dtex or more, sufficient cleaning ability can be achieved. On the other hand, by making the total fineness within the fiber bundle 42 of the second cut pile yarn 42b 2200 dtex or less, the friction load with the surface to be cleaned can be reduced.

[0054] The number of filaments in the filament yarn constituting the second cut pile yarn 42b is preferably in the range of 30 or more and 52,000 or less, more preferably in the range of 50 or more and 1,200 or less, and even more preferably in the range of 80 or more and 500 or less within one fiber bundle 42. By increasing the number of filaments to 30 or more, high cleaning power can be achieved. On the other hand, by decreasing the number of filaments to 52,000 or less, cleaning with less friction load can be achieved.

[0055] The filament density of the second cut pile yarn 42b is 15kF / inch 2 More than 182000kF / inch 2 The following range is preferable: 37.5 kF / inch 2 More than 3000kF / inch 2 The following range is more preferable: 80kF / inch 2 More than 1000kF / inch 2 The following range is even more preferable: Filament number density of 15 kF / inch 2By doing so, it is possible to achieve high cleaning performance. On the other hand, the filament density is 182,000 kF / inch 2 By doing the following, cleaning can be performed with less frictional load.

[0056] The fiber diameter of the filament yarn constituting the second cut pile yarn 42b (multifilament) is not particularly limited, and is usually in the range of 1 μm or more and 55 μm or less, preferably in the range of 1 μm or more and 35 μm or less, more preferably in the range of 5 μm or more and 30 μm or less, and even more preferably in the range of 10 μm or more and 25 μm or less.

[0057] The bundle density of fiber bundles 42 (the number of fiber bundles 42 present per unit area) is 500 bundles / inch 2 More than 3500 bundles / inch 2 The following range is preferable: 750 bundles / inch 2 More than 2500 bundles / inch 2 The following range is more preferable, 1000 bundles / inch 2 More than 2000 bundles / inch 2 The following range is even more preferable: a bundle density of 500 bundles / inch 2 By doing so, good cleanability can be maintained. On the other hand, the bundle density of the fiber bundles 42 is 3500 bundles / inch 2 By doing the following, it is possible to suppress an excessive increase in the contact area between the first cut pile yarn 42a and the second cut pile yarn 42b and the surface to be cleaned, thereby maintaining good slipperiness.

[0058] The fibers constituting the monofilament of the first cut pile yarn 42a and the multifilament of the second cut pile yarn 42b are not particularly limited and include, for example, polyamide fibers such as nylon® fibers and aramid fibers; polyester fibers such as polyethylene terephthalate (PET) fibers, polylactic acid (PLA) fibers, polytrimethylene terephthalate (PTT) fibers, polybutylene terephthalate (PBT) fibers, polypropylene terephthalate (PPT) fibers, polyethylene naphthalate (PEN) fibers, and polyarylate fibers; acrylic fibers such as polyacrylonitrile fibers; polyolefin fibers such as polyethylene fibers and polypropylene fibers; and fluorine fibers such as polytetrafluoroethylene fibers. In addition, regenerated fibers such as rayon fibers and cupro fibers; and semi-synthetic fibers such as acetate fibers and triacetate fibers (cellulose acetate fibers) are also included. Furthermore, natural fibers such as hemp, cotton, and wool are also included. Furthermore, in the case of multifilaments, only one type of synthetic fiber, regenerated fiber, semi-synthetic fiber, or natural fiber as exemplified above may be used alone, or at least two types may be blended together. Among the exemplified fibers, polyester fibers, which easily generate static electricity due to friction, are preferred because they have excellent ability to collect dirt, dust, and airborne particles. The monofilament constituting the first cut pile yarn 42a and the filament yarn constituting the second cut pile yarn 42b may be of the same type or different types.

[0059] The back coat layer 43 is provided on the back side of the base fabric 41 (the side opposite to the side where the fiber bundles 42 are napped). By providing the back coat layer 43, the back side of the base fabric 41 can be made flat. Furthermore, it is preferable that the back coat layer 43 has water resistance. This prevents water or other liquids from seeping out onto the back side of the base fabric 41 even if the fiber bundles 42 absorb water or other liquids. The constituent material of the back coat layer 43 is not particularly limited, and examples include styrene-butadiene rubber, butadiene rubber, and acrylic resin.

[0060] The thickness of the back coat layer 43 is not particularly limited, but is usually preferably in the range of 0 mm to 1 mm, more preferably in the range of 0.05 mm to 0.8 mm, even more preferably in the range of 0.05 mm to 0.5 mm, and particularly preferably in the range of 0.1 mm to 0.3 mm. By providing the back coat layer 43, the mechanical strength and protective properties of the brush portion 34 itself can be maintained well. On the other hand, by making the thickness of the back coat layer 43 1 mm or less, it is possible to prevent an excessive decrease in the flexibility and pliability of the brush portion 34.

[0061] The first rotation support portion 32a and the second rotation support portion 32b of the rotating brush 23 rotatably support the rotating brush 23. The first rotation support portion 32a has a first insertion portion 36a into which one end of the rotating shaft portion 33 is fitted and fixed, a block-shaped first bearing portion 36b fixed to the first insertion portion 36a, and an annular first flange portion 36c provided on the outer circumferential surface of the first insertion portion 36a. Furthermore, a timing pulley 36d is provided on the first insertion portion 36a. The second rotation support portion 32b has a second insertion portion 37a into which the other end of the rotating shaft portion 33 is fitted and fixed, a block-shaped second bearing portion 37b fixed to the second insertion portion 37a, and an annular second flange portion 37c provided on the outer circumferential surface of the second insertion portion 37a. The first bearing portion 36b and the second bearing portion 37b are fitted into the first receiving portion 28 or the second receiving portion 29, respectively, when attaching the rotating brush 23 to the suction device body 21. In addition, an endless belt 27 is stretched over the outer circumference of the timing pulley 36d, thereby enabling the driving force of the rotating brush motor 25 to be transmitted to the rotating brush 23.

[0062] The vacuum cleaner 1 of this embodiment uses a brush section 34 equipped with a fiber bundle 42 made up of a mixture of first cut pile yarns 42a and second cut pile yarns 42b, as the rotating brush 23. When in use, the first cut pile yarns 42a are supported by the second cut pile yarns 42b and make stronger contact with the surface to be cleaned than the second cut pile yarns 42b. Therefore, with the rotating brush 23 of this embodiment, when the surface to be cleaned is a floor, it is possible to clean by wiping with the second cut pile yarns 42b while preventing damage to the floor surface by the first cut pile yarns 42a. In particular, since the brush section 34 is spirally wound to cover the outer circumferential surface of the rotating shaft section 33, the wiping effect of the brush section 34 is high. Furthermore, since the second cut pile yarn 42b is thinner than the first cut pile yarn 42a, even if there are fine irregularities on the floor surface, the second cut pile yarn 42b can penetrate into the depressions, effectively removing dust and other debris. On the other hand, when the surface to be cleaned is a carpet, the first cut pile yarn 42a has an excellent dust-raising effect, allowing for cleaning by scraping out dust and other debris. In addition, since the first cut pile yarn 42a reduces the pressure from the floor surface on the second cut pile yarn 42b, the occurrence of flattening of the second cut pile yarn 42b can be suppressed or reduced.

[0063] In this embodiment, the present invention has been described using the example of a case in which the strip-shaped brush portion 34 is wound spirally around the outer surface of the rotating shaft portion 33 without any gaps. However, the present invention is not limited to this embodiment, and for example, multiple strip-shaped brush portions 34 may be wound spirally while being spaced apart from each other at any distance. Furthermore, the method of winding the brush portion 34 is not limited to the spiral case, and for example, multiple strip-shaped brush portions 34 may be attached to the outer surface of the rotating shaft portion 33 without any gaps so as to be parallel to the axial direction of the rotating shaft portion 33. In addition, even in the case of such a winding method, each brush portion 34 may be attached while being spaced apart from each other at any distance.

[0064] (Second Embodiment) A vacuum cleaner according to a second embodiment of the present invention will be described below with reference to the drawings. The vacuum cleaner 2 of this embodiment is similar in basic configuration to the vacuum cleaner 1 of the first embodiment (see Figure 1). However, the vacuum cleaner 2 of this embodiment differs from the vacuum cleaner 1 of the first embodiment in that it uses a rotating brush consisting of multiple strip-shaped brush sections spaced apart from each other and extending spirally in the axial direction of the rotating shaft. In the following description, components similar to those of the vacuum cleaner 1 of the first embodiment are denoted by the same reference numerals and their descriptions are omitted.

[0065] As shown in Figure 6, the rotating brush 51 of this embodiment comprises a brush body 52 and a first rotation support portion 32a and a second rotation support portion 32b attached to both axial ends of the brush body 52. ​​Figure 6 is a schematic side view of the rotating brush 51 of this embodiment. Furthermore, the rotating brush 51 of this embodiment is rotatably attached to the suction device 13', as in the first embodiment (see Figure 2).

[0066] As shown in Figures 6 and 7, the brush body 52 of the rotating brush 51 comprises a rotating shaft portion 53 and a band-shaped brush portion 54 that extends spirally in the axial direction on the outer circumferential surface of the rotating shaft portion 53. Figure 7 is a schematic cross-sectional view of the rotating brush 51 of this embodiment. The number of brush portions 54 is not particularly limited and can be multiple. In this embodiment, as shown in Figure 7, the brush body 52 has a structure in which six brush portions 54 are arranged at central angles of 60° apart.

[0067] The rotating shaft portion 53 is cylindrical and is made of, for example, metal or synthetic resin. The surface of the rotating shaft portion 53 is provided with six grooves 55 that extend spirally in the axial direction. The six grooves 55 are arranged to be equally spaced from one another. Furthermore, the six grooves 55 are formed from one end to the other end of the rotating shaft portion 53. As shown in Figure 7, the grooves 55 are dovetail grooves, with an opening that opens radially outward being narrower than the bottom (inner part). However, the grooves of the present invention are not limited to dovetail grooves, and are not particularly limited as long as they have a structure that can be fitted with the base of the brush portion 54, which will be described later.

[0068] The brush portion 54 is strip-shaped and comprises at least a base fabric 41, a plurality of fiber bundles 42 provided on the surface of the base fabric 41 by raising the nap, a back coat layer 43 provided on the back surface of the base fabric 41, a base portion 56, and an adhesive layer (not shown) that adheres the back coat layer 43 and the base portion 56. The brush portion 54 has the same length as the groove portion 55. The base portion 56 has a shape that fits into the groove portion 55. In this embodiment, the base portion 56 is a strip-shaped flat plate. The brush portion 54 is attached to the outer circumferential surface of the rotating shaft portion 53 by fitting the base portion 56 into the groove portion 55. The width of the brush portion 54 (the width in the direction perpendicular to the longitudinal direction of the brush portion 54) is not particularly limited and can be set arbitrarily.

[0069] In this embodiment, the vacuum cleaner 2 uses a rotating brush 51 in which a spiral-shaped brush portion 54 extends from the outer circumferential surface of the rotating shaft portion 53 in the axial direction. The brush portion 54, as in the first embodiment, includes a fiber bundle 42 composed of a mixture of first cut pile yarns 42a and second cut pile yarns 42b. Therefore, in this embodiment, when the surface to be cleaned is a floor, it is possible to clean by wiping with the second cut pile yarns 42b while preventing damage to the floor surface by the first cut pile yarns 42a. Furthermore, since the second cut pile yarns 42b are thinner than the first cut pile yarns 42a, even if there are fine irregularities on the floor surface, the second cut pile yarns 42b can penetrate into the recesses, effectively removing dirt. On the other hand, when the surface to be cleaned is a carpet or the like, the first cut pile yarn 42a has an excellent beating effect on dust and other debris, allowing for cleaning by scraping out the dust and other debris. In particular, the brush portion 54 is configured to extend spirally in the axial direction on the outer circumferential surface of the rotating shaft portion 53, spaced apart from each other, resulting in a high dust and debris beating effect by the brush portion 54. Furthermore, since the first cut pile yarn 42a reduces the pressure from the floor surface on the second cut pile yarn 42b, the occurrence of flattening of the second cut pile yarn 42b can be suppressed or reduced.

[0070] In this embodiment, the present invention has been described using the case in which the strip-shaped brush portion 54 extends spirally around the outer circumference of the rotating shaft portion 53 as an example. However, the present invention is not limited to this embodiment, and for example, the brush portion 54 may be provided on the outer circumference of the rotating shaft portion 53 such that the direction in which the multiple strip-shaped brush portions 54 extend is parallel to the axial direction of the rotating shaft portion 53. In this case, the groove portion 55 provided on the rotating shaft portion 53 is also provided so as to be parallel to the axial direction of the rotating shaft portion 53. [Examples]

[0071] (Brush sections A-I) In brush sections A to I, a strip-shaped brush section was created comprising a base fabric made of woven fabric with warp and weft threads, pile threads woven in a pile weave so as to intertwine with the weft threads of the base fabric in a W-shape, and a back coat layer provided on the back side of the base fabric.

[0072] Polyester fibers were used for the warp and weft threads of the base fabric. For the pile threads, monofilament yarn made of polyester resin was used as the first cut pile thread, and multifilament yarn made of polyester resin was used as the second cut pile thread, so that monofilament and multifilament yarns were mixed within a single fiber bundle. The physical properties of the first and second cut pile threads in brush sections A to I are shown in Tables 1 and 2. The back coat layer had a thickness of 0.2 mm and was made of styrene-butadiene rubber (SBR).

[0073] [Table 1]

[0074] [Table 2]

[0075] (Brush section J~T) In the brush sections J to T, a strip-shaped brush section was created comprising a base fabric made of woven fabric with warp and weft threads, pile threads woven in a pile weave so as to intertwine with the weft threads of the base fabric in a W-shape, a back coat layer provided on the back side of the base fabric, and a base.

[0076] Polyester fibers were used for the warp and weft threads of the base fabric. For the pile yarns, sections J, K, and O used fiber bundles consisting solely of monofilament yarns, while sections L, M, and P used fiber bundles consisting solely of multifilament yarns. Section N used a configuration where a first cut pile yarn made of monofilament yarn and a second cut pile yarn made of multifilament yarn were alternately arranged in a straight line along the longitudinal direction. Furthermore, sections Q to T used a configuration where monofilament and multifilament yarns were mixed within a single fiber bundle. The physical properties of each pile yarn in sections J to T are shown in Tables 3 and 4. The backcoat layer had a thickness of 0.2 mm and was made of styrene-butadiene rubber (SBR).

[0077] [Table 3]

[0078] [Table 4]

[0079] (Examples 1-9) In Examples 1 to 9, a rotating brush having a structure similar to that of the first embodiment was manufactured. That is, a rotating brush was manufactured in which one of the brush parts A to I was spirally wound around the outer circumferential surface of the rotating shaft so as to completely cover it without any gaps.

[0080] (Comparative Examples 1-9) In Comparative Examples 1 to 9, a rotating brush with a structure similar to that of the first embodiment was manufactured. Specifically, a rotating brush was manufactured in which one of the brush sections J to N and Q to T was spirally wound around the outer circumferential surface of the rotating shaft so as to completely cover it without any gaps.

[0081] (Examples 10-18) In Examples 10 to 18, a rotating brush having a structure similar to that of the second embodiment was manufactured. That is, a rotating brush was manufactured in which one of the brush sections A to I extends spirally in the axial direction on the outer circumferential surface of the rotating shaft.

[0082] (Comparative Examples 10-18) In Comparative Examples 10-13 and 15-18, a rotating brush with a structure similar to that of the second embodiment was manufactured. Specifically, a rotating brush was manufactured in which either brush sections J-M or Q-T extended spirally from the outer circumferential surface of the rotating shaft. In Comparative Example 14, a rotating brush with a structure similar to that of the second embodiment was also manufactured. However, in Comparative Example 14, three brush sections O and three brush sections P were arranged alternately on the outer circumferential surface of the rotating shaft, and the rotating brush extended spirally.

[0083] (Evaluation of ease of cleaning) The cleaning performance of carpet and floor surfaces was evaluated using a vacuum cleaner (product name: Dyson® V8 Origin, manufactured by Dyson Corporation) equipped with any of the rotating brushes of Examples 1-9 and Comparative Examples 1-9. Cleaning performance was evaluated by measuring the amount of sand sucked up.

[0084] First, 60g of sand was scattered on the carpet surface. The vacuum cleaner was set to high power, and the suction attachment equipped with a rotating brush was moved at a speed of approximately 50cm / sec to clean the carpet surface. An acrylic punch carpet was used as the carpet. The suction attachment was moved approximately 150cm, and the same area was cleaned three times. After cleaning was completed, the mass of sand sucked up by the vacuum cleaner was measured. The results are shown in Table 5.

[0085] Next, 200g of sand was scattered on the floor surface, and the vacuum cleaner was set to low power mode. The suction attachment, equipped with a rotating brush, was moved at a speed of approximately 50cm / sec to clean the floor surface. A smooth floor surface made of a vinyl chloride sheet was used. The suction attachment was moved approximately 150cm, and the same area was cleaned three times. After cleaning was completed, the mass of sand sucked up by the vacuum cleaner was measured. The results are shown in Table 5.

[0086] Next, using vacuum cleaners equipped with rotating brushes from Examples 10-18 and Comparative Examples 10-18, the amount of sand suctioned was measured in the same manner as in Example 1, and the cleaning performance on carpet and floor surfaces was evaluated. The results are shown in Table 6.

[0087] [Table 5]

[0088] [Table 6] [Explanation of Symbols]

[0089] 1, 2...Vacuum cleaner, 11...Vacuum cleaner body, 12...Connection part, 13...Suction attachment, 14...Suction port, 15...Partition plate, 16...Air suction port, 17...Motor bearing, 18...Motor, 19...Motor shaft, 19a...Pulley, 20...Rotating support, 21...Suction attachment body, 22...Suction port, 23...Rotating brush for suction attachment, 24...Rotating brush storage chamber, 25...Motor for rotating brush, 26...Air suction port, 27...Endless belt, 28...Receiving part, 29...Receiving part, 31...Brush body, 32a...First rotation support part, 32b...First 2...Rotation support section, 33...Rotation shaft section, 34...Brush section, 35...Adhesive layer, 36a...First insertion section, 36b...First bearing section, 36c...Flange section, 36d...Timing pulley, 37a...Second insertion section, 37b...Second bearing section, 37c...Flange section, 41...Base fabric, 42...Fiber bundle, 42a...First cut pile yarn, 42b...Second cut pile yarn, 43...Back coat layer, 44...Warp yarn, 45...Weft yarn, 51...Rotation brush, 52...Brush body, 53...Rotation shaft section, 54...Brush section, 55...Groove section, 56...Base

Claims

1. A rotating brush for a vacuum cleaner, which is rotatably attached to the vacuum cleaner's suction attachment and comprises a rotating shaft portion and a brush portion provided on the outer circumference of the rotating shaft portion, The brush portion comprises a base fabric and a plurality of fiber bundles provided on the surface of the base fabric by raising the nap. The fiber bundle comprises a first cut pile yarn made of monofilament and a second cut pile yarn made of multifilament. The first cut pile yarn is exposed from the napped surface formed by the erection of the second cut pile yarn, or has the same pile height as the napped surface. The ratio of the pile height of the second cut pile yarn to the pile height of the first cut pile yarn is within the range of 0.6 or more and 1 or less. The fiber diameter of the monofilament is within the range of 60 μm or more and 300 μm or less. A rotating brush for a suction device, wherein the single filament fineness of the multifilament is in the range of 0.01 dtex or more and 30 dtex or less.

2. The rotating brush for a suction device according to claim 1, wherein each fiber bundle is a mixture of the first cut pile yarn and the second cut pile yarn.

3. The rotating brush for a suction device according to claim 1, wherein at least one strip-shaped brush portion is attached to the outer circumferential surface of the rotating shaft portion.

4. The rotary brush for a suction device according to claim 1, wherein a plurality of strip-shaped brush portions are provided spaced apart from each other and extending in the axial direction of the rotating shaft portion.

5. The aforementioned multifilament is made of crimped yarn, The rotating brush for a suction device according to claim 1, wherein the crimping rate of the crimped yarn is within the range of 1% or more and 60% or less.

6. The total fineness within the fiber bundle of the first cut pile yarn is in the range of 40 dtex or more and 1000 dtex or less. The total fineness within the fiber bundle of the second cut pile yarn is in the range of 100 dtex or more and 2200 dtex or less. The rotating brush for a suction device according to claim 1, wherein the ratio of the total fineness of the second cut pile yarn to the total fineness of the first cut pile yarn is within the range of 0.3 times or more and 20 times or less.

7. The bundle density of the aforementioned fiber bundles is 500 bundles / inch ２ More than 3500 bundles / inch ２ A rotating brush for a suction device according to claim 1, which is within the following range.

8. The rotating brush for a suction device according to claim 1, wherein the second cut pile yarn is opened.

9. A suction device comprising a rotating brush for a suction device as described in any one of claims 1 to 8.

10. A vacuum cleaner equipped with the suction device described in claim 9.

Images