JP2008188320A - Vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum cleaner capable of improving a dust removing performance by using a suction tool for the cleaner provided with a plurality of rotary brushes, and improving the self-traveling property of the suction tool for the cleaner further. <P>SOLUTION: The vacuum cleaner comprises: a cleaner main body 1 provided with a motor-driven blower; a suction tool main body 16 provided with a suction opening 18 formed on the bottom surface and moved back and forth on a surface to be cleaned; a connector whose one end is connected to the cleaner main body 1 and other end is connected to the suction tool main body 16, for forming a suction air path between the cleaner main body 1 and the suction tool main body 16; and a dust detection means 40 for detecting a duct amount in the air passing through the suction air path. The suction tool main body 16 is provided with a plurality of rotary brushes 30 and 33 and a drive source 24 for rotationally driving the plurality of rotary brushes 30 and 33. On the basis of detection signals from the dust detection means 40, the rotation speed of the plurality of rotary brushes 30 and 33 is controlled. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vacuum cleaner.

  A conventional vacuum cleaner suction tool is provided with a single rotating brush that is rotationally driven by an electric motor or the like, and the cleaning brush provided in the longitudinal direction of the outer periphery of the rotating brush scoops up dust on the surface to be cleaned. . However, since the surface to be cleaned cannot be sufficiently cleaned with only one rotating brush, an apparatus having two rotating brushes in parallel has been invented. However, when two electric motors are used to rotate each of the two rotating brushes, there is a problem that the vacuum cleaner suction tool becomes heavy and the operability of the vacuum cleaner suction tool is deteriorated.

  Thus, for example, in the vacuum cleaner suction tool 60 disclosed in Patent Document 1, as shown in FIG. 13, the rotary tool 63 is driven to rotate by an electric motor 61 and has a first rotating brush 63 provided with a cleaning piece 62 on the outer periphery. Similarly, the second rotating brush 65 provided with the cleaning piece 64 on the outer periphery is arranged in parallel, and the cleaning piece 62 and the cleaning pieces 64 are overlapped with each other, so that the first rotating brush 63 is obtained with one electric motor 61. , And the rotational force is transmitted to the second rotating brush 65 so that the second rotating brush 65 is also rotated.

  However, in the configuration of the vacuum cleaner suction tool 60 described above, particularly when the surface to be cleaned is a carpet, the protrusion of the cleaning piece 64 of the second rotary brush 65 driven to rotate by the first rotary brush 63 is the first. Since the length of the cleaning piece 64 is shorter than that of the cleaning piece 62 of the first rotating brush 63, the waist of the cleaning piece 64 becomes strong, and as a result, the cleaning piece 64 tends to bite into the carpet and is difficult to rotate, and the cleaning performance cannot be sufficiently exhibited. was there.

Therefore, when the surface to be cleaned is a carpet, in order to reduce the contact resistance of the surface to be cleaned with the rotating brush, in the vacuum cleaner suction tool 70 disclosed in Patent Document 2, as shown in FIG. The rotation center of the rotary brush 72 is arranged so as to be higher than the rotation center of the first rotary brush 71, or the outer diameter of the second rotary brush 72 is made smaller than the outer diameter of the first rotary brush 71. Thus, even when the surface to be cleaned is a carpet, the second rotating brush 72 can be cleaned without sinking into the carpet.
JP 2003-125991 A JP 2001-120473 A

  However, in the vacuum cleaner suction tool 70 disclosed in Patent Document 2, when the surface to be cleaned is a wooden floor or a tatami mat, the second rotating brush 72 is slightly separated from the surface to be cleaned. Although the rotary brush 71 cleans the dust on the surface to be cleaned, air is sucked from the gap between the second rotary brush 72 and the surface to be cleaned, so the dust removal performance is poor. I had to do it. In addition, the rotation center of the second rotary brush 72 can be moved up and down, and the separation distance between the second rotary brush 72 and the surface to be cleaned can be switched according to the type of the surface to be cleaned. It will be troublesome.

  Further, in the vacuum cleaner suction tool 60 disclosed in Patent Document 1, since the cleaning piece 64 bites into the carpet, a large load is applied to the second rotating brush 65, so that the first rotation for rotating the second rotating brush 65 is performed. The rotational force of the brush 63 is reduced, and the forward running performance (self-propelled) of the vacuum cleaner suction tool 60 is hindered. For this reason, an excessive load is applied to the electric motor 61 that rotationally drives the first rotating brush 63, and there is a problem that the electric motor 61 generates heat abnormally or burns out.

  The present invention solves such a conventional problem, improves dust removal performance using a vacuum cleaner suction tool provided with a plurality of rotating brushes, and further, self-propelled of the vacuum cleaner suction tool An object of the present invention is to provide a vacuum cleaner capable of improving the energy efficiency and realizing excellent energy saving characteristics.

  In order to solve the above-described conventional problems, a vacuum cleaner according to claim 1 of the present invention includes a vacuum cleaner body including an electric blower, a suction opening formed on a bottom surface, and communicated with the suction opening. A suction tool main body having a connection port connected to the connection tool and being moved forward and backward on the surface to be cleaned; one end connected to the cleaner main body; the other end connected to the connection port of the suction tool main body; A connecting tool that forms an intake passage between the machine main body and the suction tool main body, and dust detection means for detecting the amount of dust in the air that passes through the intake passage, and the suction tool main body includes the opening A rotating brush that is pivotally supported in a vertical direction in the advancing / retreating direction of the suction tool main body and arranged in parallel with each other, and that rotates in a direction to advance the suction tool main body, and a direction opposite thereto A plurality of rotating brushes comprising rotating rotating brushes and It becomes a drive source for rotationally driving the plurality of rotary brushes, based on the detection signal from the dust detecting means, is characterized in controlling the rotational speed of the plurality of rotating brushes.

  According to the vacuum cleaner configured as described above, the surface to be cleaned in line with the surface to be cleaned by controlling the number of rotations of the plurality of rotating brushes based on the information related to the amount of dust detected by the dust detecting means. Effectively scrapes up the dust to improve dust removal performance, and the rotating brush rotates to contact the surface to be cleaned, and the force generated in the direction to move the suction tool forward or backward by the rotational force By controlling the balance, it is possible to help the suction tool body travel in the forward or backward direction, and to improve the traveling performance, and thus the operability of the vacuum cleaner. In addition, since a plurality of rotating brushes can be efficiently rotated by the driving source, excellent energy saving characteristics can also be realized.

  A vacuum cleaner according to claim 2 of the present invention is the vacuum cleaner according to claim 1, wherein the dust detection means discriminates the type of the surface to be cleaned from the change in the amount of dust in the intake passage. And when the dust detecting means determines that the surface to be cleaned is a carpet, among the plurality of rotating brushes, the number of rotations of the rotating brush that rotates in the direction in which the suction tool body is advanced is increased. Is to control.

  According to the vacuum cleaner configured as above, when the suction tool main body is moved forward on the carpet, the cleaning suction tool is increased by increasing the number of rotations of the rotating brush that rotates in the direction of moving the suction tool main body forward. Can improve the running performance in the forward direction (self-propelled), improve the operability of the vacuum cleaner, suppress the sinker body from sinking into the carpet, and keep the dust removal performance high be able to.

  The vacuum cleaner according to a third aspect of the present invention is the vacuum cleaner according to the first aspect, wherein the dust detecting means can easily remove dust on the surface to be cleaned from a change in the amount of dust in the intake passage. As the degree of dust removal difficulty on the surface to be cleaned is highly evaluated by the dust detection means, among the plurality of rotating brushes, the suction tool body is rotated in the direction of advancing. The rotational speed of the rotating brush to be controlled is controlled to be further increased.

  According to the vacuum cleaner configured as described above, the rotational speed of the electric motor is controlled according to the degree of dust removal, and the higher the dust removal difficulty is evaluated, the more the rotating brushes are advanced in the direction in which the suction tool body is advanced. By further increasing the rotational speed of the rotating brush that rotates in the forward direction, it is possible to improve the traveling performance (self-propelled) in the forward direction of the cleaning suction tool, and improve the operability of the vacuum cleaner, for example, When the suction tool main body is moved forward on the carpet having the highest degree of dust removal difficulty, the suction tool main body can be prevented from sinking into the carpet, and the dust removal performance can be maintained high.

  The vacuum cleaner which concerns on Claim 4 of this invention is a vacuum cleaner as described in any one of the said Claims 1-3. WHEREIN: Among these rotary brushes, it advances most in the advancing / retreating direction of the said suction tool main body. The rotating brush arranged on the side is driven to rotate by the drive source, and the other rotating brush is driven to rotate by the rotation of the rotating brush arranged on the most forward side.

  According to the vacuum cleaner configured as described above, the rotating brush arranged on the most forward side is driven to rotate by the driving source, and the rotating brush is further driven to rotate by the rotating brush. It can be efficiently rotated by one electric motor, and excellent energy saving characteristics can be realized.

  A vacuum cleaner according to a fifth aspect of the present invention is the vacuum cleaner according to any one of the first to third aspects, further comprising a traveling direction detection means for detecting a traveling direction of the suction tool body. When the traveling direction detection means determines that the traveling direction is backward, among the plurality of rotating brushes, the rotational speed of the rotating brush that rotates in the direction of retracting the suction tool body is increased. It is something to control.

  According to the vacuum cleaner configured as described above, when the suction tool main body is moved backward on the carpet, the cleaning suction tool is increased by increasing the number of rotations of the rotating brush that rotates in the direction in which the suction tool main body is moved backward. Can improve the running performance in the backward direction (self-running), improve the operability of the vacuum cleaner, suppress the sinker body from sinking into the carpet, and keep the dust removal performance high be able to.

  A vacuum cleaner according to claim 6 of the present invention is the vacuum cleaner according to claim 5, wherein the drive source includes a plurality of electric motors corresponding to the plurality of rotating brushes, respectively. The rotational speed of the rotating brush is controlled by an electric motor corresponding to each rotating brush.

  According to the vacuum cleaner configured as described above, the plurality of electric motors are provided corresponding to each of the plurality of brushes, so that the number of rotations of the plurality of rotating brushes can be accurately controlled, and each of the plurality of electric motors. Therefore, it is possible to maintain the high operability of the vacuum cleaner by suppressing an increase in weight due to the addition of an electric motor and a rotational force transmission mechanism that transmits this rotational force to the rotating brush. it can.

  According to the electric vacuum cleaner of the present invention, the dust removing performance of the vacuum cleaner suction tool is improved, the self-running property is further improved, and excellent energy saving characteristics can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
The vacuum cleaner 100 in Embodiment 1 of this invention is demonstrated using FIG. FIG. 1 is an overall perspective view of the electric vacuum cleaner according to the first embodiment.

  As shown in FIG. 1, an electric blower chamber 3 incorporating an electric blower 2 is arranged at the rear part of the cleaner body 1, and a dust collection bag for collecting sucked dust at the front part of the cleaner body 1. A dust collection chamber 4 is disposed that detachably accommodates (not shown) and communicates with the suction side opening of the electric blower 2. A pair of traveling wheels 5 are attached to the left and right sides of the rear lower part of the vacuum cleaner body 1 so as to be rotatable with respect to a traveling shaft horizontally disposed. The caster 6 is attached so as to be rotatable around a vertical axis and to be rotatable with respect to a traveling shaft arranged horizontally. A connection joint portion 11 provided at one end of the suction hose 10 is detachably connected to the front surface of the vacuum cleaner main body 1 and an air inlet 7 communicating with the dust collecting chamber 4 is provided.

  The other end of the suction hose 10 is provided with a tip joint portion 12 having a handle 14 having an operation portion 14a for an operator to hold during cleaning and to operate the cleaner body 1. . One end of the proximal side of the extension tube 13 which is configured to be extendable or connectable is detachably connected to the distal end joint portion 12 of the suction hose 10, and the other end on the distal end side of the extension tube 13 is connected to the end of the suction hose 10. The vacuum cleaner suction tool 15 of the first embodiment is detachably connected. The suction hose 10, the connection joint portion 11, the tip joint portion 12, the extension pipe 13, and the handle 14 constitute a connection tool of the vacuum cleaner 100.

  A bumper 8 made of an elastic material is extended on the surface from the front part of the vacuum cleaner body 1 to both sides. Even when the vacuum cleaner body 1 collides with furniture, pillars, etc. during the travel of the vacuum cleaner body 1 To avoid scratching. A main body handle 9 provided on the rear upper surface of the vacuum cleaner main body 1 so as to be undulated is gripped when the vacuum cleaner main body 1 is carried.

  Next, a detailed configuration of the vacuum cleaner suction tool 15 connected to the electric vacuum cleaner 100 (the vacuum cleaner main body 1) according to the first embodiment will be described with reference to FIGS. FIG. 2 is an external perspective view of the vacuum cleaner suction tool connected to the electric vacuum cleaner according to Embodiment 1 of the present invention, and FIG. 3 is a plan view when the upper case of the vacuum cleaner suction tool is removed. FIG. 4 is a plan view of the vacuum cleaner suction tool viewed from the bottom side, FIG. 5 is a cross-sectional view of the vacuum cleaner suction tool, and FIG. 6 shows the vacuum cleaner suction tool. It is sectional drawing of the rotary brush with which it is equipped. 2 and the subsequent drawings, the direction in which the operator holding the handle 14 pushes forward (advances) the vacuum cleaner suction tool 15 in the traveling direction of the vacuum cleaner suction tool 15 is forward (lower left in FIG. 2). The direction in which the operator pulls back (retracts) the vacuum cleaner suction tool 15 is referred to as the rear (upper right direction in FIG. 2). Further, the right side is referred to as the right side (upper left direction in FIG. 2) and the left side is referred to as the left side (lower right direction in FIG. 2) with respect to the direction in which the vacuum cleaner suction tool 15 is advanced.

  As shown in FIG. 2, the main body case 17 of the vacuum cleaner suction tool 15 includes an upper case 17a and a lower case 17b having an opening 18 (suction opening) on the bottom surface. The connecting tube 19 is attached so as to be tiltable, and the tip of the extension tube 13 is detachably fitted and fixed to the open end 19a (connecting port) of the connecting tube 19. In addition, a nozzle bumper 20 made of an elastic material such as urethane resin is provided on the outer peripheral surface of the lower case 17b, and functions to alleviate an impact when hitting furniture (not shown).

  Further, as shown in FIG. 4, on the bottom surface of the lower case 17b, a pair of front wheels 21 for traveling near the front left and right ends, and a pair of rear wheels 22 for traveling near the rear left and right ends, respectively, are freely rotatable. Has been attached to. In addition, an undulating safety switch 23 is attached to the rear center of the opening 18 so as to be able to undulate, and the undulating safety switch 23 is in contact with the surface to be cleaned and falls into the attached recess. When a person operates the operation portion 14a, first and second rotary brushes 30 and 33, which will be described later, of the cleaner body 1 rotate, and the undulating safety switch 23 is separated from the surface to be cleaned from the inside of the recess. In an upright state, the first and second rotating brushes 30 and 33 are configured not to rotate even when the operator operates the operation unit 14a.

  As shown in FIG. 5, a rotary brush chamber 18 a serving as a rotary brush housing space is formed in the front portion of the vacuum cleaner suction tool 15 from the opening 18 to above the vacuum cleaner suction tool 15. The rear side of the brush chamber 18 a communicates with the connection pipe 19. The first rotating brush 30 is housed on the front side in the rotating brush chamber 18a, and the second rotating brush 33 is housed on the rear side in parallel with the first rotating brush 30. On the other hand, it is pivotally supported perpendicular to the advancing / retreating direction of the vacuum cleaner suction tool 15 so as to be rotatable.

  The first rotating brush 30 is long in a direction perpendicular to the advancing / retreating direction of the vacuum cleaner suction tool 15 and has a substantially circular shape in cross-sectional view set to a length substantially the same as the left-right width dimension of the opening 18. A shaft core member 32 and a plurality of first cleaning pieces 31 (eight in the first embodiment) set to approximately the same length as the shaft core member 32 and inserted into the shaft core member 32; It has.

  On the outer peripheral surface of the shaft core member 32, a plurality of strips 32a (eight strips in the first embodiment) are formed along the longitudinal direction, as shown in FIG. In 32a, the portion close to the opening on the opposite side wall surface bulges toward the other opposite side wall surface, the opening width of the groove portion 32a is narrowed, and the first center portion on the axial center side from the opening A space for accommodating the base end portion 31 a of the cleaning piece 31 is formed.

  The first cleaning piece 31 includes a proximal end portion 31a and a fibrous portion 31b made of a plurality of fibers raised on the proximal end portion 31a. The proximal end portion of the first cleaning piece 31 31a is inserted into, guided and assembled in the proximal end portion accommodating space of the groove portion 32a formed in the shaft core member 32, and the fibrous portion 31b of the first cleaning piece 31 is the groove portion of the shaft core member 32. Projecting outward from 32a.

  Similarly to the first rotating brush 30, the second rotating brush 33 is also long in a direction perpendicular to the advancing / retreating direction of the vacuum cleaner suction tool 15, and has substantially the same length as the left-right width dimension of the opening 18. The set shaft core member 35 having a substantially circular shape in cross-sectional view, and a plurality of strips that are set to substantially the same length as the shaft core member 35 and are inserted into the shaft core member 35 (eight strips in the first embodiment). ) Second cleaning piece 34.

  A plurality of strips (eight strips in the first embodiment) are provided on the outer peripheral surface of the shaft core member 35 along the longitudinal direction thereof, and the side wall surfaces facing each other in the groove portions 35a. The portion adjacent to the opening of the second bulge bulges toward the other opposing side wall surface, the opening width of the groove 35a is narrowed, and the proximal end portion of the second cleaning piece 34 is located on the axial center side of the opening. A space for accommodating 34a is formed. The second cleaning piece 34 includes a base end portion 34a and a fibrous portion 34b made of a plurality of fibers raised from the base end portion 34a. The end portion 34 a is inserted into the proximal end accommodating space of the groove portion 35 a formed in the shaft core member 35, guided and assembled, and the fibrous portion 34 b of the second cleaning piece 34 is the groove of the shaft core member 35. It protrudes outward from the strip 35a.

  As described above, the first cleaning piece 31 is easily attached to the shaft core member 32 of the first rotary brush 30 by the base end portion 31 a being inserted into the groove portion 32 a of the shaft core member 32. When it is assembled and needs to be replaced, it can be easily removed from the shaft core member 32 by being extracted from the groove 32a. The same applies to the second cleaning piece 34 of the second rotating brush 33.

  In the first embodiment, the protrusion margin (L2) of the fibrous portion 34b of the second cleaning piece 34 from the groove portion 35a is from the groove portion 32a of the fibrous portion 31b of the first cleaning piece 31. It is set longer than the protrusion margin (L1).

  Furthermore, the fibrous part 34b which comprises the 2nd cleaning piece 34 is thinned out along the longitudinal direction of the 2nd rotary brush 33, and is intermittently formed as the some fiber bundle 34c. Then, the plurality of fiber bundles 36c are shifted in the width direction (longitudinal direction of the second rotating brush 33) from each other in the plurality of second cleaning pieces 34, and the raised positions are shifted as a whole. The entire width of the rotary brush 33 in the longitudinal direction is covered.

  Here, a rotation driving mechanism that rotates the first rotating brush 30 and the second rotating brush 33 by the rotation of the electric motor 24 will be described.

  On the rear side of the rotary brush chamber 18a of the vacuum cleaner suction tool 15, the first rotary brush 30 is rotationally driven in the normal rotation direction, that is, in the direction of moving the vacuum cleaner suction tool 15 forward. An electric motor 24 as a drive source is accommodated.

  A pulley 26 having irregularities formed on the outer peripheral surface is fixed to one end side (left end portion) of the first rotary brush 30, and an axial core is provided to one end side (left end portion) of the second rotary brush 33. The holding material 27a is fixed. And the connection support material 28 attached so that the rotating shaft (not shown) protruded to the left end side of the pulley 26 may be rotatably supported by the second rotating brush 33 by the bearing portion 28a on the second rotating brush 33 side. A state in which the fixed shaft core holding member 27a is rotatably supported, and the first rotary brush 30 and the second rotary brush 33 are rotatably held by the connection support member 28 at a predetermined interval. The suction tool main body 16 is fixed at an appropriate position on the left end side of the upper case 17a. In addition, shaft holding members 27b and 27c are fixed to the other end side (right end portion) of the first rotating brush 30 and the other end side (right end portion) of the second rotating brush 33, respectively. The shaft core holding members 27b and 27c are fixed at appropriate positions on the right end side of the upper case 17a of the suction tool main body 16 in a state where the shaft core holding members 27b and 27c are rotatably held with a predetermined interval therebetween.

  In this way, the electric motor 24 (the electric motor 24 (the belt 24) stretched between the pulley 24 b fixed to the shaft 24 a of the electric motor 24 and the pulley 26 fixed to the end portion of the first rotating brush 30. The rotation of the shaft 24 a) is transmitted to the first rotating brush 30.

  Then, the first cleaning piece 31 of the first rotating brush 30 is an area where the second cleaning piece 34 is not formed on the second rotating brush 33 (a plurality of second cleaning pieces 34 are adjacent to each other). The first cleaning piece 31 presses the second cleaning piece 34 from the back side in the rotational direction as the first rotary brush 30 is driven to rotate, thereby the second rotary brush 33. Is driven to rotate as the first rotating brush 30 rotates. That is, by the rotational drive from the electric motor 24, the first rotary brush 30 rotates in a direction for moving the vacuum cleaner suction tool 15 forward, and the second rotary brush 33 rotates in a direction for moving the vacuum cleaner suction tool 15 backward. To do.

  By configuring as described above, when the vacuum cleaner suction tool 15 is run on the surface to be cleaned and cleaned, the second rotating brush 33 comes into contact with the surface to be cleaned and flexes flexibly. As a result, the load applied to the first rotating brush 30 that rotationally drives the second rotating brush 33 can be reduced, and the first and second rotating brushes 30 and 33 can be efficiently rotated. Since the dust on the surface to be cleaned can be efficiently scraped by the rotation of the second rotating brushes 30 and 33, the dust removal performance can be greatly improved.

  Next, the control operation by the dust sensor provided in the dust passage (intake passage) of the electric vacuum cleaner 100 according to the first embodiment will be described with reference to FIG. FIG. 7 is a control block diagram of the dust sensor.

  The dust sensor 41 for detecting dust passing through the dust passage is provided with a light emitting portion 41a made of a light emitting diode on one side (downward in FIG. 5) of the peripheral wall of the dust passage 19b in the connecting pipe 19, and this light emitting portion 41a. A light receiving portion 41b is provided on the other side (upper side in FIG. 5) of the peripheral wall facing the, and detects a change in light quantity due to dust passing through the dust passage 19b. The signal from the light receiving unit 41 b is amplified by the amplification unit 42, shaped into a waveform by the pulse conversion unit 43, converted into a pulse signal, and then input to the microcomputer 44. The microcomputer 44 counts the number of pulses input from the pulse conversion unit 43 within a unit time (for example, 0.1 second), and counts the count in the counting unit 45 for a predetermined time (for example, 1 Floor surface discriminating unit 46 for discriminating the type of floor surface (surface to be cleaned) based on the degree of change in the cumulative count over time, and the floor surface information discriminated by the floor surface discriminating unit 46. And a control unit 47 that sets the rotation speed of the electric motor 24 (that is, the rotation speed of the first rotary brush 30).

  The accumulated count number accumulated every predetermined time by the floor surface determination unit 46 gradually decreases because dust on the surface to be cleaned is removed as time passes. However, the degree of attenuation (degree of change) varies depending on the type of surface to be cleaned. That is, when the surface to be cleaned is a carpet, the dust is entangled with the hair of the carpet, so it cannot be removed rapidly, and the degree of attenuation of the cumulative count is moderate. Further, when the surface to be cleaned is a wooden floor, a flooring floor, a tatami mat, etc., dust is removed relatively quickly, and the degree of attenuation of the cumulative count number is quick. As described above, since the degree of change in the total count varies depending on the type of the surface to be cleaned, the floor surface determination unit 46 can determine the type of the surface to be cleaned from the degree of change in the total count. Here, the floor surface determination unit 46 calculates, for example, the decay rate of the cumulative count number after a certain period of time as an evaluation value from the degree of change in the actually detected count number over time, and the microcomputer 44 Refer to the discrimination standard value stored in the memory and compare the actual evaluation value with this discrimination standard value to determine whether the floor type is carpet, or other than carpets such as wooden floors, flooring floors, and tatami mats. Determine if it is a thing.

  From the microcomputer 44, a signal of a level corresponding to the rotation speed of the electric motor 24 set by the control unit 47 is output to the phase control unit 48, and the phase of the voltage applied to the electric motor 24 is controlled by the phase control unit 48. 24. As a result, the rotation speed of the first rotating brush 30 is controlled. In the first embodiment, the dust sensor 41 (light emitting unit 41a, light receiving unit 41b), amplification unit 42, pulse conversion unit 43, microcomputer 44 (counting unit 45, floor surface determination unit 46, control unit 47) and The phase control unit 48 constitutes the dust detection means 40.

  In the first embodiment, when the floor surface determination unit 46 determines that the surface to be cleaned is other than the carpet, the control unit 47 arranges the suction tool body 16 on the forward side in the advancing / retreating direction, The number of rotations of the first rotating brush 30 that rotates in the direction in which the tool body 16 moves forward is controlled to the number of rotations applied to the surface to be cleaned such as a wooden floor. When the floor surface determination unit 46 determines that the surface to be cleaned is a carpet, the control unit 47 applies the number of rotations of the first rotating brush 30 to the surface to be cleaned such as a wooden floor. It is controlled so as to increase compared with the rotation speed to be generated.

  Next, operation | movement of the vacuum cleaner 100 in this Embodiment 1 comprised as mentioned above is demonstrated using FIG. FIG. 8 is a partial cross-sectional view when the vacuum cleaner suction tool according to Embodiment 1 of the present invention is operated on the surface to be cleaned. FIG. 8A is a case where the surface to be cleaned is a wooden floor, and FIG. The case where the surface to be cleaned is a carpet is shown.

  A power cord (not shown) is pulled out from the vacuum cleaner main body 1, a power plug (not shown) attached to the tip thereof is inserted into a wall outlet, and the operation unit 14 a provided on the handle 14 is operated to operate the electric blower 2 and the vacuum cleaner. When the electric motor 24 built in the vacuum suction tool 15 is energized, the suction force of the electric blower 2 acts on the opening 18 provided in the bottom surface of the lower case 17b of the vacuum cleaner suction tool 15 to cover the floor such as a wooden floor or a carpet. Dust on the cleaning surface is scraped up and sucked by the fibrous portions 31b and 34b of the first and second cleaning pieces 31 and 34, and is carried to the dust collecting chamber 4 through the extension pipe 13 and the suction hose 10. Then, it is collected.

  At this time, the dust sensor 41 provided in the dust passage 19b detects the dust passing through the dust passage 19b, is counted by the counting unit 45 in the microcomputer 44, and is accumulated by the floor surface discrimination unit 46 every predetermined time. The number is obtained, and the type of the surface to be cleaned is determined from the change over time. And the control part 47 sets the rotation speed of the electric motor 24 according to the kind of to-be-cleaned surface discriminate | determined by the floor surface discrimination | determination part 46, and the phase control part 48 controls the rotation speed.

  When the surface to be cleaned is something other than a carpet such as a wooden floor, flooring, or tatami mat, the rotational speed of the electric motor 24 is controlled to be the rotational speed applied to the surface to be cleaned such as a wooden floor. That is, when cleaning a surface to be cleaned other than such a carpet, the front wheel 21 and the rear wheel 22 provided in the lower case 17b of the suction tool main body 16 provide a predetermined space between the bottom surface of the lower case 17b and the surface to be cleaned. A gap is secured. When the surface to be cleaned is a wooden floor or the like, the load applied to the first rotating brush 30 (first cleaning piece 31) and the second rotating brush 33 (second cleaning piece 34) is light. Both the rotating brush 30 and the second rotating brush 33 rotate efficiently, and dust is effectively removed from the surface to be cleaned, and at the same time, the wiping effect is sufficiently exhibited.

  On the other hand, when the surface to be cleaned is a carpet, the number of rotations of the electric motor 24 is controlled to be higher than the number of rotations applied to the surface to be cleaned such as a wooden floor. The That is, when the carpet surface to be cleaned is cleaned without controlling the rotational speed of the electric motor 24 as described above, the front wheel 21, the rear wheel 22, the first rotating brush 30 (first cleaning piece 31) and the second wheel The rotary brush 33 (second cleaning piece 34) sinks into the carpet, the load applied to the first and second rotary brushes 30, 33 becomes heavy, the rotation is suppressed by the carpet, and further for the vacuum cleaner. Although the forward movement of the suction tool 15 is also inhibited, in the first embodiment, since the rotational speed of the first rotating brush 30 is controlled to increase, the rotational driving force by the electric motor 24 is strengthened, The rotations of the first and second rotating brushes 30 and 33 are maintained appropriately high, so that dust sinking into the back of the hand can be scraped up and removed effectively, and sinking of the suction tool body 16 is also suppressed. In front of the vacuum cleaner suction tool 15 Driving performance (self-propelled resistance) and operability is improved.

  As described above, in the first embodiment, the rotation driving force in the forward rotation direction of the first rotating brush 30 is strengthened, so that the rotation of the first rotating brush 30 is maintained high, and the suction tool Both of these actions of suppressing the sinking of the main body 16 into the carpet are exerted synergistically, and the second rotating brush 33 is easily rotated by the rotation of the first rotating brush 30, and this The first rotating brush 30 and the second rotating brush 33 scavenge and effectively remove dust on the surface to be cleaned, improve the dust removing performance, and further improve the running performance of the vacuum cleaner suction tool 15. And operability will also be improved.

  As a result, the user who operates the vacuum cleaner 100 according to the present invention can obtain excellent dust removal performance even on a carpet as in the case of a wooden floor and the like, and a vacuum cleaner suction tool. 15 can be easily moved forward by a light force, and the vacuum cleaner 100 can be easily operated. In addition, if there is a self-propelling effect in the forward direction and the vacuum cleaner suction tool 15 is operated so as to pull it forward, it will likely add a heavy burden on the user's hand. Because it is easy to apply force when pulling, I do not care much.

(Embodiment 2)
A vacuum cleaner suction tool 15A (suction tool body 16A) according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 9 is a control block diagram of a dust sensor provided in a dust passage of the vacuum cleaner suction tool according to Embodiment 2 of the present invention. In addition, about the same part as the vacuum cleaner suction tool 15 of the said Embodiment 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the first embodiment, the floor surface determination unit 46 of the dust detection unit 40 determines only the type of the floor surface (surface to be cleaned). However, in the dust detection unit 40A of the second embodiment, this is the case. In addition, the floor surface determination unit 46A is also configured to determine the degree of dust removal difficulty indicating the ease of removal of dust on the surface to be cleaned from the change in the amount of dust in the dust passage.

  Therefore, in the second embodiment, the floor surface determination unit 46A has a function of determining the degree of dust removal difficulty on the surface to be cleaned from the degree of change over time of the accumulated count number accumulated every predetermined time. . That is, the floor discriminating unit 46A is stored in the storage unit 49 of the microcomputer 44A, and the actually detected count is referred to with reference to the temporal change pattern of the cumulative count number associated with the plurality of levels of dust removal difficulty. Select the time course pattern that best fits the degree of time course of the number.

  For example, the storage unit 49 stores temporal change patterns A to E of the cumulative count number associated with five levels of dust removal difficulty (ranks 1 to 5), and the motor 24 ( The number of rotations of the first rotating brush 30) is stored. Here, the carpet having long hair that is most difficult to remove dust is positioned as rank 5 having the highest degree of dust removal difficulty, and the rotation speed of the electric motor 24 is set to the highest value. Further, the wooden floor and the flooring are positioned as rank 1 with the lowest degree of dust removal difficulty, and the rotation speed of the electric motor 24 is set to the lowest value. Further, floors such as tatami mats and short-haired carpets and carpets are positioned at a medium dust removal difficulty level, and the rotation speed of the electric motor 24 is set to a medium value.

  46 A of floor surface discrimination | determination parts select the temporal change pattern most suitable to the degree of an actual temporal change from temporal change patterns AE, and the control part 47A is based on the selected floor surface information. Based on the rotational speed of the electric motor 24 assigned to the degree of dust removal difficulty (ranks 1 to 5), the control rotational speed of the electric motor 24 is set in the phase controller 48.

  Then, when the floor surface determination unit 46A determines that the surface to be cleaned is a carpet, the dust detection means 40A is disposed on the forward side in the advancing / retreating direction of the suction tool main body 16A by the control unit 47A. The rotational speed of the electric motor 24 that rotationally drives one rotary brush 30 is set to be the highest, and the rotational speed of the first rotary brush 30 is set to increase as the degree of dust removal difficulty on the surface to be cleaned increases. The controller 48 controls the number of rotations.

  When the surface to be cleaned is a wooden floor or a flooring, the rotation speed of the electric motor 24 is controlled to be the lowest among the rotation speeds applied to other surfaces to be cleaned. That is, when cleaning a surface to be cleaned such as a wooden floor, the front wheel 21 and the rear wheel 22 provided on the lower case 17b of the suction tool main body 16A have a predetermined space between the bottom surface of the lower case 17b and the surface to be cleaned. The gap is secured. When the surface to be cleaned is a wooden floor or the like, the load applied to the first rotating brush 30 (first cleaning piece 31) and the second rotating brush 33 (second cleaning piece 34) is light. Even when the rotational speed of 24 is set to the lowest rotational speed, both the first rotating brush 30 and the second rotating brush 33 rotate efficiently, and dust can be effectively removed from the surface to be cleaned. At the same time, the wiping effect is fully demonstrated.

  On the other hand, when the surface to be cleaned is a carpet with long hair, control is performed so that the rotational speed of the electric motor 24 is the highest among the rotational speeds applied to other cleaned surfaces. Is done. That is, when the surface to be cleaned of a long-haired carpet is cleaned without controlling the rotation speed of the electric motor 24 as described above, the front wheel 21, the rear wheel 22, the first rotating brush 30 and the second rotating brush 33 are used as the carpet. The load applied to the first and second rotating brushes 30 and 33 becomes heavy, the rotation is suppressed by the carpet with long hair, and further, the forward movement of the vacuum cleaner suction tool 15A is also inhibited. However, in the second embodiment, since the rotation speed of the first rotating brush 30 is controlled to be the highest, the rotational driving force by the electric motor 24 is strengthened, and the first and second rotations are performed. The rotation of the brushes 30 and 33 is properly maintained, the dust sinking into the back of the hand can be scraped up and removed effectively, and the sinking of the suction tool body 16 is also suppressed, and the vacuum cleaner suction tool 15A. Forward movement performance ( Taxis) and operability can be improved.

  When the surface to be cleaned is a tatami mat, the rotation speed of the electric motor 24 is controlled to be slightly higher than that applied to the surface to be cleaned such as a wooden floor. That is, when cleaning a surface to be cleaned such as a tatami mat, a predetermined gap is secured between the bottom surface of the lower case 17b and the surface to be cleaned by the front wheel 21 and the rear wheel 22, Clogged dust is difficult to remove. Therefore, even if the rotation speed of the electric motor 24 is set to a low rotation speed, the load applied to the first and second rotating brushes 33 is light, so that both the first rotating brush 30 and the second rotating brush 33 rotate efficiently. In addition, dust clogged with tatami mats can be effectively removed from the surface to be cleaned.

  In addition, when the surface to be cleaned is a carpet or carpet with short hair, control is performed so that the rotational speed of the electric motor 24 is slightly lower than that applied to the surface to be cleaned such as a carpet with long hair. Is done. That is, when cleaning the surface to be cleaned such as a carpet or carpet having short hair, the front wheel 21, the rear wheel 22, the first rotating brush 30 (first cleaning piece 31) and the second rotating brush 33 ( The second cleaning piece 34) sinks a little in the carpet or carpet with short hairs, and the load applied to the first and second rotating brushes 30 and 33 becomes somewhat heavy. And although it is not as much as the case of a carpet with long hair, the rotation is suppressed, and also the forward movement of the vacuum cleaner suction tool 15A is inhibited. Therefore, the rotational speed of the electric motor 24 is set to a high rotational speed (a rotational speed lower than that in the case of a long-haired carpet), whereby the rotational driving force by the electric motor 24 is strengthened, and the first and second rotating brushes 30. The rotation of 33 is properly maintained, dust that sinks in the back of the hair can be scraped up and removed, and the forward movement performance (self-propelled) and operability of the vacuum cleaner suction tool 15A are improved. The

(Embodiment 3)
A vacuum cleaner suction tool 15B (suction tool body 16B) according to Embodiment 3 of the present invention will be described with reference to FIGS. FIG. 10 is a plan view when the upper case of the vacuum cleaner suction tool according to Embodiment 3 of the present invention is removed, FIG. 11 is a cross-sectional view of the vacuum cleaner suction tool, and FIG. It is a control block diagram of the dust sensor provided in the dust passage of this vacuum cleaner suction tool. In addition, about the same part as the vacuum cleaner suction tool 15 of the said Embodiment 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the present third embodiment, the first rotary brush 30 of the vacuum cleaner suction tool 15B is rotationally driven by the electric motor 24 and the vacuum cleaner suction, similarly to the vacuum cleaner suction tool 15 of the first embodiment. The acceleration sensor 51 is fixed at an appropriate position in the center of the upper case 17a of the tool 15B, and the second rotating brush 33 is driven to rotate by the electric motor 54. That is, as shown in FIG. 10, there are an electric motor 24 that rotationally drives the first rotary brush 30, and a rotational force transmission mechanism such as a belt 25 and a pulley 26 that transmit the rotational force of the electric motor 24 to the first rotary brush 30. An electric motor 54 that is disposed on the left side of the suction tool main body 16B and that rotationally drives the second rotary brush 33, a belt 55 that transmits the rotational force of the electric motor 54 to the second rotary brush 33, a pulley 56, and the like Is provided on the right side of the suction tool body 16B. It should be noted that the left end portions of the first rotating brush 30 and the second rotating brush 33 are appropriately positioned on the left end side of the upper case 17a in a state where the left end portions of the first rotating brush 30 and the second rotating brush 33 are rotatably held at a predetermined interval by the connecting bearing material 57. It is fixed to.

  The electric motor 54 that rotationally drives the second rotating brush 33 is applied with a force in the rotating direction as the first rotating brush 30 rotates. It may be smaller than the electric motor 24 that rotationally drives the motor 30, and the weight increase associated with the incorporation of the electric motor 54 and the rotational force transmission mechanism related thereto is not so great.

  An acceleration sensor 51 is fixedly installed in the upper case 17a in the rear of the rotary brush chamber 18a of the suction tool body 16 and in the vicinity of the attachment position of the connecting pipe 19. As the acceleration sensor 51, a piezoelectric acceleration sensor, a capacitive acceleration sensor, or the like is preferably used. Among them, the piezoelectric acceleration sensor is more suitably used because it is small and light and has excellent durability. The output signal from the acceleration sensor 51 is input to the travel direction determination unit 52 described below provided in the microcomputer 44. In the third embodiment, the acceleration sensor 51 and the traveling direction discriminating unit 52 constitute a traveling direction detection unit 50.

  The computer 44B includes a traveling direction determination unit 52 in addition to the configuration (computer 44A) described in FIG. 9 in the second embodiment, and a signal related to the acceleration of the suction tool main body 16 detected by the acceleration sensor 51. The travel direction determination unit 52 inputs the travel direction determination unit 52 to determine the travel (forward / reverse) direction of the vacuum cleaner suction tool 15B. In the control unit 47B, the rotational speed of the electric motor 54 is set in accordance with the traveling direction determined by the traveling direction determination unit 52, and a signal of a level corresponding to the rotational speed of the electric motor 54 set by the control unit 47B from the computer 44B. Is output to the phase control unit 48b, and the phase of the voltage applied to the electric motor 54 is controlled by the phase control unit 48b, so that the rotation speed of the electric motor 54 and thus the second rotary brush 33 is controlled.

  In the third embodiment, the floor surface determination unit 46 determines that the surface to be cleaned is a carpet, and the traveling direction detection means 50 (acceleration sensor 51, traveling direction determination unit 52) indicates that the traveling direction is forward. In the same manner as in the first embodiment, the control unit 47B controls the rotational speeds of both the motors 24 and 54, and is arranged on the forward side in the forward / backward direction of the suction tool body 16B. Control is performed such that the rotational speed of the first rotating brush 30 that rotates in the direction in which the tool body 16 </ b> B moves forward is relatively increased with respect to the rotational speed of the second rotating brush 33. In this case, only the rotational speed of the first rotary brush 30 may be increased, and after the rotational speed of the second rotary brush 33 is increased, the first rotary brush with respect to the second rotary brush 33 is further increased. You may raise the rotation speed of the 1st rotation brush 30 so that the rotation ratio of 30 may be raised.

  As described above, when the suction tool main body 16B is moved forward on the carpet, the number of rotations of the first rotating brush 30 that rotates in the direction of moving the suction tool main body 16B forward is increased, so that the cleaning suction tool 15B The traveling performance (self-propelled) in the forward direction can be improved, the operability of the vacuum cleaner 100 is improved, and the suction tool main body 16B is suppressed from sinking into the carpet, so that the dust removal performance is kept high. can do.

  Further, when the floor surface determination unit 46 determines that the surface to be cleaned is a carpet, and the traveling direction detection means (acceleration sensor 51, traveling direction determination unit 52) determines that the traveling direction is backward, control is performed. The number of rotations of both the electric motors 24 and 54 is controlled by the portion 47B, and the number of rotations of the second rotating brush 33 arranged on the backward side in the advancing / retreating direction of the suction tool main body 16B is set to the number of rotations of the first rotating brush 30. It is controlled to raise relative to In this case, only the number of rotations of the second rotating brush 33 may be increased, and after the number of rotations of the first rotating brush 30 is increased, the second rotating brush with respect to the first rotating brush 30 is further increased. You may raise the rotation speed of the 2nd rotation brush 33 so that the rotation ratio of 33 may be raised.

  As described above, when the suction tool main body 16B is retreated on the carpet, the number of rotations of the second rotary brush 33 rotating in the direction in which the suction tool main body 16B is retracted is increased, so that the cleaning suction tool 15B Travel performance in the backward direction (self-propelled) can be improved, the operability of the vacuum cleaner 100 is improved, and the suction tool main body 16B is suppressed from sinking into the carpet to maintain high dust removal performance. can do.

  Therefore, when the surface to be cleaned is a carpet, by applying such rotational speed control of the first and second rotating brushes 30 and 33, the suction tool 15B for the cleaner in the forward direction and the backward direction can be used. The vacuum cleaner 100 can be operated with a light force by improving self-propelledness, and not only can the dust removal performance be maintained high by simply using the first and second rotating brushes 30 and 33, The operability can also be improved.

(Modification in the above embodiment)
Hereinafter, modifications to the vacuum cleaner suction tools 15, 15 </ b> A, and 15 </ b> B exemplified in the first and second embodiments will be described.

  In the first and second embodiments, the dust sensor 41 (the light emitting unit 41a and the light receiving unit 41b) is provided in the dust passage 19b in the connection pipe 19 of the vacuum cleaner suction tool 15. However, the dust sensor 41 is not necessarily connected. It is not necessary to be provided in the dust passage 19b in the pipe 19 or in the vicinity thereof, and it may be provided at any appropriate place in the dust passage from the air inlet 7 above the rotating brush chamber 18a to the dust collecting chamber 4 of the cleaner body 1. .

  Furthermore, the electric motors 24 and 54 and the rotational force transmission mechanism (belts 25 and 55, pulleys 26 and 56, shaft core holding member 27 in the vacuum cleaner suction tools 15, 15A and 15B shown in the first to third embodiments described above. (27a-27c), connection support material 28, connection bearing materials 29, 57, etc.) are merely examples, and it goes without saying that various forms can be applied.

  In the second embodiment, the storage unit 49 of the microcomputer 44A stores the temporal change patterns A to E of the cumulative count number previously associated with the five levels of dust removal difficulty (ranks 1 to 5). In addition, the configuration in which the rotation speed of the electric motor 24 is stored corresponding to each of the rotation speeds of the electric motor 24 is described. It is also possible to configure so that it can be changed. Further, the number of rotations of the electric motor 24 corresponding to the degree of dust removal difficulty (ranks 1 to 5) is set to a plurality of stages of rotation strength (for example, “weak”, “normal”, “a little strong”, “strong”, “very strong”, etc. ) Can be selected. If comprised in this way, according to the floor surface of a user's house or room, and also according to a user's preference, the rotation speed of the 1st and 2nd rotary brushes 30 and 33 can be set arbitrarily. The convenience of the vacuum cleaner 100 can be further improved.

  It should be noted that the degree of dust removal difficulty and the number of time-dependent change patterns of 5 stages exemplified in the second embodiment are merely examples, and of course, may be 3 stages, 4 stages, or 6 stages or more. Moreover, the dust removal difficulty level and the temporal change pattern do not necessarily have the same number of steps. Furthermore, in said Embodiment 1-4, although what comprised two of the 1st and 2nd rotating brushes 30 and 33 was illustrated as the some rotating brush with which the suction tool 15 for vacuum cleaners was equipped, it is not necessarily 2 It is not limited to a book, You may be comprised with three or more rotating brushes.

  In the third embodiment, the method of using the acceleration sensor 51 as the traveling direction detection means has been described. As another method, the lower end protrudes downward from the bottom surface of the suction tool main body 16B, and the front side or the rear side. You may use the tilting member attached in the state which can be tilted to the side. This tilting member is made of a soft and flexible material, and is supported horizontally at a position where the tilting shaft is close to the upper end side, and the lower end slidingly contacting the surface to be cleaned is the tilting shaft as a fulcrum. The suction tool body 16 tilts forward or backward as the suction tool body 16 moves forward or backward. The traveling direction detecting means using the tilting member detects the movement on the upper end side associated with the tilting operation at the lower end with a limit switch or the like provided in the vicinity thereof, and determines the traveling direction of the suction tool main body 16B. It is something to detect.

  Further, as a traveling direction detection means that replaces the acceleration sensor 51, the outer peripheral surface of the rotating body (for example, a wheel) protrudes downward from the bottom surface of the suction tool main body 16B and is rotatable along the traveling direction of the suction tool main body 16B. You may use the attached small caster. The caster includes, for example, a rotation shaft provided perpendicular to the bottom surface of the suction tool main body 16B, a rotation frame body rotatably attached to the rotation shaft, and the rotation frame body. And a rotating body that is rotatably supported horizontally at a position displaced in the horizontal direction from the center of the rotation axis, and the rotation body is rearward in the traveling direction with respect to the rotation axis with the traveling operation of the suction tool body 16B. The rotating frame body rotates so as to be located on the side. And the running direction detection means using a small caster can detect the running direction of the suction tool main body 16B by detecting the turning direction of this turning frame.

  In the above first to third embodiments, the fibrous portion 34b constituting the second cleaning piece 34 of the second rotary brush 33 is thinned out along the longitudinal direction of the second rotary brush 33, and a plurality of The plurality of fiber bundles 34c are formed intermittently as fiber bundles 34c, and the raised positions of the second rotary brushes 33 are shifted as a whole by shifting their raised positions while overlapping each other in the plurality of second cleaning pieces 34. However, the full width region in the longitudinal direction of the second rotating brush 33 may be covered without thinning out the fibrous portion 34b.

  Further, instead of the second cleaning piece 34 as described above, the number of fibers is reduced to the whole without forming the fiber bundle 34 c in the fibrous portion 34 b of the second cleaning piece 34, and the first cleaning piece 31. It may be less than the number of fibers in the fibrous portion 31b. Further, the thickness of the fibers constituting the fibrous portion 34 b of the second cleaning piece 34 may be made thinner than the thickness of the fibers constituting the fibrous portion 31 b of the first cleaning piece 31.

  Furthermore, in said Embodiment 1-3, the protrusion margin (L2) of the fibrous part 34b of the 2nd cleaning piece 34 is set longer than the protrusion allowance (L1) of the fibrous part 31b of the 1st cleaning piece 31. However, both protrusion margins (L1, L2) may be substantially equal.

  Whichever form is adopted, if the contact resistance between the second cleaning piece 34 and the surface to be cleaned when driven to rotate is set smaller than the contact resistance between the first cleaning piece 31 and the surface to be cleaned. The load applied to the second rotating brush 33 is reduced, thereby reducing the load applied to the first rotating brush 30 that rotationally drives the second rotating brush 33, and the first and second rotating brushes 30, 33 are efficient. It rotates well and can greatly improve the dust removal performance.

  As described above, the vacuum cleaner suction tool according to the present invention is one in which the first and second rotary brushes rotate efficiently and has excellent dust removal performance. Can be used for vacuum cleaner.

It is a whole perspective view of the vacuum cleaner in Embodiment 1 of this invention. It is an external appearance perspective view of the vacuum cleaner suction tool connected to the electric vacuum cleaner in Embodiment 1 of this invention. It is a top view when the upper case of the suction tool for cleaners in Embodiment 1 of this invention is removed. It is the reverse view seen from the bottom face side of the vacuum cleaner suction tool in Embodiment 1 of this invention. It is sectional drawing of the suction tool for cleaners in Embodiment 1 of this invention. It is sectional drawing of the rotating brush with which the suction tool for cleaners in Embodiment 1 of this invention is equipped. It is a control block diagram of the dust sensor provided in the dust passage of the suction tool for vacuum cleaners in Embodiment 1 of this invention. It is a fragmentary sectional view when operating the suction tool for cleaners in Embodiment 1 of this invention on a to-be-cleaned surface, (a) is a to-be-cleaned surface, and (b) is to-be-cleaned surface. The case of a carpet is shown. It is a control block diagram of the dust sensor provided in the dust passage of the suction tool for vacuum cleaners in Embodiment 2 of this invention. It is a top view when the upper case of the suction tool for cleaners in Embodiment 3 of this invention is removed. It is sectional drawing of the suction tool for cleaners in Embodiment 3 of this invention. It is a control block diagram of the dust sensor provided in the dust passage of the suction tool for cleaners in Embodiment 3 of this invention. It is sectional drawing which shows embodiment with the suction tool for conventional vacuum cleaners. It is sectional drawing which shows other embodiment of the suction tool for conventional vacuum cleaners.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body 15 Suction tool for vacuum cleaners 16 Suction tool main body 24 Electric motor (drive source)
DESCRIPTION OF SYMBOLS 30 1st rotation brush 31 1st cleaning piece 33 2nd rotation brush 34 2nd cleaning piece 40 Dust detection means 50 Traveling direction detection means

Claims (6)

A vacuum cleaner body equipped with an electric blower;
A suction opening body is formed on the bottom surface, has a connection port connected to the connection tool in communication with the suction opening, and a suction tool body moved forward and backward on the surface to be cleaned;
One end is connected to the cleaner body, the other end is connected to a connection port of the suction tool body, and a connection tool that forms an intake passage between the cleaner body and the suction tool body,
A dust detection means for detecting the amount of dust in the air passing through the intake passage,
The suction tool body is rotatable in the opening, and the shaft core is pivotally supported perpendicularly to the advancing / retreating direction of the suction tool body and arranged in parallel with each other, and rotates in a direction to advance the suction tool body. A plurality of rotating brushes each including a rotating brush and a rotating brush that rotates in the opposite direction; and a drive source that rotationally drives the plurality of rotating brushes.
An electric vacuum cleaner that controls the number of rotations of the plurality of rotating brushes based on a detection signal from the dust detection means. The dust detection means determines the type of the surface to be cleaned from a change in the amount of dust in the intake passage;
When the dust detection means determines that the surface to be cleaned is a carpet, control is performed to increase the number of rotations of the rotating brush that rotates in the direction of advancing the suction tool body among the plurality of rotating brushes. The vacuum cleaner according to claim 1. The dust detection means evaluates the degree of dust removal difficulty indicating how easily dust is removed from the surface to be cleaned from the change in the amount of dust in the intake passage,
As the degree of dust removal difficulty on the surface to be cleaned is highly evaluated by the dust detection means, control is performed so as to increase the number of rotations of the rotating brush that rotates in the direction in which the suction tool main body is advanced among the plurality of rotating brushes. The vacuum cleaner according to claim 1.   Among the plurality of rotating brushes, the rotating brush arranged on the most forward side in the advancing / retreating direction of the suction tool main body is driven to rotate by the drive source, and the other rotating brush is arranged on the most advanced side. The electric vacuum cleaner according to any one of claims 1 to 3, which is rotationally driven by rotation of a rotating brush. Furthermore, it comprises travel direction detection means for detecting the travel direction of the suction tool body,
When the traveling direction detecting means determines that the traveling direction is backward, control is performed to increase the rotational speed of the rotating brush that rotates in the direction of retracting the suction tool body among the plurality of rotating brushes. The vacuum cleaner as described in any one of Claims 1-3 to do.   The said drive source is provided with the some electric motor corresponding to each of these rotary brushes, The rotation speed of these rotary brushes is controlled by the electric motor corresponding to each rotary brush. Electric vacuum cleaner.

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