JP2008086617A - Vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum cleaner which stably compresses dust and dirt, and has a high durability and a high usability. <P>SOLUTION: This electric vacuum cleaner has a dust collecting container 4 which captures dust and dirt, a compression plate 30 which is arranged in the dust collecting container 4, and a compression driving motor 56 which drives the compression plate 30. The electric vacuum cleaner can capture more dust and dirt in the dust collecting container 4 by compressing dust and dirt in the dust collecting container 4 with the compression plate 30. In the electric vacuum cleaner, the compression plate 30 is constituted in a manner to be slidable in the direction for compressing dust and dirt in the dust collecting container 4 and in the reverse direction. The operating speed in the compression direction is set at a speed having a sufficient margin to the strength/durability of the compression plate 30 and the compression driving motor 56, and also, the operating speed in the reverse direction is set to be as fast as possible. Thus, the electric vacuum cleaner is provided which has a high durability/usability by a simple constitution without greatly extending the compressing operation time. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vacuum cleaner, and more particularly to a vacuum cleaner having a mechanism for compressing collected dust.

  As a conventional electric vacuum cleaner of this type, a dust bag is compressed by the force of a spring (for example, refer to Patent Document 1), and when the vacuum cleaner main body is stored in a storage case, There is one that compresses dust by causing the portion to interfere with dust compression means of the cleaner body (see, for example, Patent Document 2).

  The conventional vacuum cleaner described in Patent Document 1 compresses a dust collection bag. However, when compressing dust in a dust collection container, the compression means obstructs the intake air path and reduces the suction force. In order not to drop, it is necessary to reverse the compression means after compressing the dust, that is, to reciprocate the compression means. On the other hand, in the configuration of the conventional vacuum cleaner described in Patent Document 2, when the vacuum cleaner body is placed on the storage case, the dust is compressed depending on whether the vacuum cleaner is placed slowly or when it is placed vigorously. There were problems such as changes in condition and the dust collecting case was damaged or deformed due to excessive force applied to the compression plate.

Therefore, in order to solve the above problem, there is a mechanism provided with a release mechanism for releasing the connection between the compression unit and the drive source of the compression unit when the load on the compression unit becomes heavy (for example, a patent) Reference 3).
Japanese Patent Publication No. 64-4776 Japanese Patent Laid-Open No. 02-7927 Japanese Examined Patent Publication No. 58-22683

  In the configuration of the vacuum cleaner described in Patent Document 2, when the compression is desired, the vacuum cleaner must be set in the storage case and the compression speed changes depending on the setting method. There were problems with the strength and durability against damage and deformation of the dust case.

  Moreover, in the structure of the vacuum cleaner described in the above-mentioned Patent Document 3, the release mechanism for releasing the connection between the drive unit and the compression means has a mechanical structure, so that there is a lot of dust in the dust collection case. When this happens, slipping occurs between the pair of clutches that form the release mechanism each time the dust is compressed, so that the durability is poor and the sliding noise is large, resulting in poor usability. Furthermore, the higher the moving speed of the compression means, the greater the load on the compression means. Therefore, the reciprocation speed of the compression means must be set slower, and the time required for compression becomes longer. For example, in a vacuum cleaner that automatically compresses before and after the operation of the vacuum cleaner, it is not difficult to imagine that the longer the time it takes to compress, the lower the usability.

  An object of the present invention is to solve the above-described conventional problems, and to provide a vacuum cleaner that can maintain a high suction force and is excellent in durability and usability by compressing collected dust. To do.

  In order to solve the above-described conventional problems, an electric vacuum cleaner of the present invention includes an electric blower, a dust collecting container that collects dust, and an electric blower that is detachably mounted while communicating with the electric blower. A dust collection container storage unit; compression means disposed in the dust collection container; and compression drive means for driving the compression means. The compression means compresses the dust in the dust collection container. Thus, in the electric vacuum cleaner capable of collecting more dust in the dust collecting container, the compression means can slide in the direction of compressing the dust in the dust collecting container and in the opposite direction. Further, the operation speed in the compression direction by the compression driving means is different from the operation speed in the opposite direction. For example, by setting the operation speed in the compression direction to a speed with sufficient margin for the strength and durability of the compression means and compression drive means, and setting the operation speed in the reverse direction as fast as possible. The durability can be improved with a simple configuration without greatly extending the compression operation time. Depending on the driving force required for compressing dust and the control method of the compression means, there may be a case where the operation speed in the compression direction is better than the operation speed in the reverse direction. In addition, even when the amount of dust is detected by detecting the position of the compression means, detecting the amount of movement, or detecting the amount of load, the detection accuracy is improved as much as the movement speed of either the forward path or the return path of the compression means can be slowed down. It also has the merit of

  The electric vacuum cleaner of the present invention can improve durability with a simple configuration without greatly extending the compression operation time, and is excellent in durability and usability.

  According to a first aspect of the present invention, there is provided an electric blower, a dust collection container that collects dust, a dust collection container storage unit that is in communication with the electric blower and is detachably attached to the dust collection container, and the inside of the dust collection container Compression means disposed in the container, and compression drive means for driving the compression means. By compressing the dust in the dust collection container by the compression means, more dust is contained in the dust collection container. The vacuum cleaner is configured to be slidable in the direction of compressing the dust in the dust collecting container and in the opposite direction, and in the compression direction by the compression driving means. For example, the operation speed in the compression direction has a sufficient margin for the strength and durability of the compression means and compression drive means. Set to speed and possible to move in the reverse direction By setting fast Ri, without extending significantly the compression operation time, it is possible to improve the durability with a simple structure. Depending on the driving force required for compressing dust and the control method of the compression means, there may be a case where the operation speed in the compression direction is better than the operation speed in the reverse direction. In addition, even when the amount of dust is detected by detecting the position of the compression means, detecting the amount of movement, or detecting the amount of load, the detection accuracy is improved as much as the movement speed of either the forward path or the return path of the compression means can be slowed down. It also has the merit of

  In the second aspect of the invention, the compression means of the first aspect of the invention is driven in the compression direction to compress dust, and then is driven in the reverse direction to return to a predetermined origin position, and the operation speed in the compression direction is increased. The operation speed in the reverse direction is slower, and the durability can be improved with a simple configuration without greatly increasing the compression operation time. In addition, when detecting the amount of dust by detecting the position of the compression means, detecting the movement amount, and detecting the load amount, or when providing a clutch mechanism as disclosed in Patent Document 3, the movement speed of the compression means can be reduced. Improves.

  According to a third aspect, in the first aspect, when the electric blower is driven by a user operation or the like during the compression operation, the compression operation is interrupted and the operation of returning the compression means to the predetermined origin position is performed. At the same time, the operation speed when returning to the origin position is faster than the normal compression operation speed. The compression can be interrupted at the user's discretion, and when the interruption is selected, the compression is promptly performed. Since the operation ends, usability is improved.

  A fourth invention includes, in addition to the first invention, load amount detection means for detecting a load amount applied to the compression drive means, and compression speed variable means for changing an operation speed of the compression means, and the load amount Controlling the compression speed variable means according to the load amount detected by the detection means and the control state of the compression speed variable means, and changing the operating speed of the compression means, for example, While ensuring durability by increasing the operating speed at light loads, the time required for the compression operation can be further shortened than the first and second inventions, and by reducing the operating speed at heavy loads, The load detection accuracy is improved, and as a result, the reliability is improved.

  The fifth invention is characterized in that the operation speed of the compression means is reduced as the load applied to the compression means of the fourth invention increases, and the operation speed is increased at a light load. While securing durability, the time required for the compression operation can be further shortened compared to the first and second inventions, and if the operation speed is slowed down under heavy load, the load detection accuracy is improved and the reliability is also improved. It will improve.

  A sixth invention includes, in addition to the first invention, load amount detection means for detecting a load amount applied to the compression drive means, and drive force variable means for changing the drive force of the compression drive means, A vacuum cleaner characterized by changing the driving force by controlling the driving force variable means according to the load amount detected by the load amount detecting means and the control state of the driving force variable means, for example, By suppressing the driving force when the load is light, wasteful power consumption is suppressed, and by increasing the driving force when the load is heavy, the compression performance is ensured. When the load further increases, the driving force can be reduced to ensure durability.

  According to the seventh aspect of the invention, when the load applied to the compression means of the sixth invention is increased, the driving force of the compression drive means is increased, and when the load applied to the compression means exceeds a predetermined value, conversely, It is characterized by reducing the driving force of the compression means. Since the driving force is increased according to the load, the compression performance can be ensured while reducing unnecessary power consumption, and the load is further increased. In such a case, the durability can be ensured by reducing the driving force.

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

(Embodiment 1)
The vacuum cleaner in the 1st Embodiment of this invention is demonstrated using FIGS. FIG. 1 is an overall perspective view of the vacuum cleaner according to the present embodiment, and FIG. 2 is a side sectional view of the vacuum cleaner.

  1 and 2, the vacuum cleaner main body 1 is provided with an electric blower chamber 3 having an electric blower 2 built in at the rear, and a dust collecting container for storing a dust collecting container 4 that is detachable and separates and collects dust at the front. A container storage unit 5 is arranged. An air inlet 7 to which one end of the hose 6 is detachably connected is provided at the front of the cleaner body 1.

  The other end of the hose 6 is provided with a tip pipe 9 provided with a driving operation unit 8 for gripping during cleaning and operating the operation of the cleaner body 1. Reference numeral 10 denotes a telescopic or jointable extension pipe. The downstream end is detachably connected to the tip pipe 9 and the other end is detachably connected to the floor suction tool 11.

  A container handle 12 for carrying the dust collection container 4 is gripped when the dust collection container 4 is carried or removed from the dust collection container storage 5 of the cleaner body 1.

  Next, the configuration of the dust collecting container 4 will be described with reference to FIGS. FIG. 3 is a perspective view of a part of the dust collecting container of the vacuum cleaner, FIG. 4 is a sectional view of the dust collecting container, and FIG. 5 is a perspective view of the dust collecting container storage unit.

  3-5, the dust collecting container 4 is comprised from the dust collecting container main body 15 and the filter unit 16 with which the rear opening part of the dust collecting container main body 15 is detachably mounted | worn.

  A suction unit that is in airtight pressure contact with and communicates with the rear of the air inlet 7 of the cleaner body 1 when the dust container 4 is attached to the dust container container 5 of the cleaner body 1 at the front of the dust collector body 15. A mouth 17 is provided. The dust collection container body 15 further includes a coarse dust chamber 18 that directly communicates with the suction port 17 and stores coarse dust, and a filter unit 16 that collects fine dust contained in the suction air that has passed through the coarse dust chamber 18. A fine dust chamber 19 for storing the separated fine dust, and a lid 20 covering the lower portion of the coarse dust chamber 18 and the fine dust chamber 19 and having a rear end pivotally supported by the dust container main body 15 so as to be rotatable. I have.

  The lid 20 is urged in the opening direction by a coil spring 21 and is normally held by a buckle 22 provided on the dust collecting container body 15 in a closed state. When the container operating portion 23 provided on the button is pushed, the buckle 22 is moved outward through the connecting rod C46 connected thereto, and the lid 20 is opened by the biasing force of the coil spring 21. Reference numeral 25 denotes a spring material for constantly urging the container operation unit 23 upward.

  In the coarse dust chamber 18, the entire inner peripheral wall (four side walls) excluding a portion communicating with the suction port 17 is formed by a primary filter A 28 having an inclined surface 27 that gradually widens toward the lower opening 26.

  In addition, a compression plate 30 having a primary filter B29 is disposed at the upper part of the coarse dust chamber 18 and is fixed to the lower end of a connecting rod A24 that can move up and down. The compression plate 30 serves as a compression means for pressing and compressing the dust collected in the coarse dust chamber 18. One end of a substantially L-shaped slider 31 is fixed to the upper end of the connecting rod A24. A rack gear 34 is formed on the side of the slider 31 in the vertical direction. Reference numeral 32 denotes a slider spring made of an elastic member that constantly biases the connecting rod A24 upward, that is, the compression plate 30 constantly upward.

  A drive shaft 33 is rotatably supported on the side portion of the dust collecting container 4. The drive shaft 33 has a gear B 35 at the rear end, and further transmits power to the rack gear 34 via the gear group 39.

  On the other hand, the partition wall 40 that partitions the electric blower chamber 3 and the dust collecting container housing 5 in the vacuum cleaner main body 1 includes a compression drive motor 56 that is a compression drive means and can rotate forward and reverse, and the gear ratio is stepless. A transmission gear unit 64 (not shown) that can be switched to a gear, and a gear E38 for transmitting the driving force of the compression drive motor 56 to the gear B35 via the transmission gear unit 64 (not shown). , A compression drive unit 66 comprising a Hall IC and a magnet and having a rotational speed detecting means 65 (not shown) for detecting the rotational speed of the gear E38 is provided, and the dust collecting container 4 is stored in the dust collecting container. A micro switch (not shown) built in the dust collection container detection means 62 provided in the partition wall 40 is configured so that the gears B35 and E38 mesh with each other when mounted on the part 5. And down, and it is configured to notify the mounting of the dust container 4 to the control unit 52 to be described later.

  Next, the control system of the vacuum cleaner in this Embodiment is demonstrated using FIG. In FIG. 6, 51 is an energization detection means for detecting whether the cleaner body 1 is connected to a commercial power source (not shown) and energized.

  Reference numeral 52 denotes a control unit configured by a microcomputer or the like, and is a control unit that performs each load control based on information from the operation unit and each detection unit. Reference numeral 53 denotes current detection means for detecting a current flowing through the compression drive motor 56, and detects a current flowing through the compression drive motor 56, thereby detecting a load applied to the compression drive motor 56 indirectly.

  Reference numeral 57 denotes compression movement amount determination means for determining the movement amount of the compression plate 30 from the rotation amount of the gear B 35 detected by the rotation speed detection means 65. 58 is a dust collection amount judgment means for judging the amount of dust in the dust collection container, and the distance that the compression plate 30 can move according to the amount of dust in the dust collection container, that is, the rotation speed detected by the rotation speed detection means 65. The amount of dust is judged by utilizing the change of the.

  59 is a dust collection amount notifying means for notifying the user of the dust collection amount based on the dust collection amount judged by the dust collection amount judging means 58, and is a display circuit composed of LEDs or the like in this embodiment. Reference numeral 63 denotes a full notification means constituted by, for example, a buzzer for prompting the user to throw away the dust when the amount of collected dust is more than a predetermined value.

  The operation and action of the vacuum cleaner in the present embodiment configured as described above are as follows.

  When the user starts using the vacuum cleaner, when the user plugs the power plug (not shown) of the vacuum cleaner main body 1 into an outlet provided on the wall of the room, the energization detecting means 51 is energized in the vacuum cleaner main body 1. This is detected and a signal is sent to the control means 52. The control means 52 sends a signal to the transmission gear unit 64 to set the lowest gear ratio (the rotation speed of the gear B35 is minimum and the torque is maximum), and then drives the compression drive motor 56. At this time, in order to suppress the inrush current when the compression drive motor 56 is activated, the energization amount to the compression drive motor 56 is activated at DUTY 30% and gradually increased to 100% by PWM control.

  After the energization amount to the compression drive motor 56 reaches the maximum (DUTY 100%), the load amount applied to the compression drive motor 56 is indirectly detected by the current detection means 53. The gear ratio of the transmission gear unit 64 is switched according to the detected current value (load amount). At this time, the gear ratios shown in the table below are determined based on the relationship between the current gear ratio setting and the current value (load amount). The gear ratio to be switched is calculated with reference to the setting matrix. The gear ratio setting matrix in the table below is a value set in advance by evaluation, and the “load applied to the compression plate 30” estimated from the relationship between the gear ratio and the load applied to the compression drive motor 56 is If it is large, the gear ratio is set low (torque is increased, speed is slow), and if the load is small, the gear ratio is set high (torque is decreased and speed is increased).

  Furthermore, in the case of the condition of “*” in the above “Table 1” (when the gear ratio is set to the minimum and the current value is 1.2 A or more), “the compression plate 30 is lowered to the lowest point, ”Is sufficiently compressed”, the energization amount (DUTY) to the compression drive motor 56 is reduced to 30%, and after 1 second has elapsed, after a 0.1 second stop, the compression drive motor 56 is Start reversing. Note that DUTY 30% is an energization amount for applying a driving force that prevents the compression plate from being pushed back by the restoring force of the dust being compressed.

  The compression movement amount determination means 57 calculates the movement distance of the compression plate 30 from the compression start point to the bottom dead center from the output of the rotation speed detection means 65 from the start of compression to the start of reversal. On the other hand, the control means 52 sends a signal to the transmission gear unit 64 at the start of inversion to set the highest gear ratio (the rotation speed of the gear B35 is maximum and the torque is minimum), and then drives the compression drive motor 56. To do. At this time, in order to suppress the inrush current of the compression drive motor 56, the energization amount to the compression drive motor 56 is started at DUTY 30% and gradually increased to 100% by PWM control. Even during the reversing operation of the compression drive motor 56, the output from the rotation speed detecting means 65 is always monitored, and “the distance that the compression plate 30 has moved by the reversing operation = the distance that the compression plate 30 has moved from the start of compression to the start of reversal”. At this time, the energization amount (DUTY) to the compression drive motor 56 is gradually lowered to 50%. Note that, during the reverse operation, the gear ratio is switched from the current value and the gear ratio setting in the same way as during the compression operation, but the gear ratio setting matrix is different from that used during the compression operation. Yes. (During the reversing operation, the load applied to the compression plate 30 is considerably lighter than that during the compression operation due to the restoring force of the compressed dust, and it is necessary to quickly return to the top dead center. Also, when the gear ratio is the lowest setting and the current value reaches 1.2 A or more, it is determined that “the compression plate 30 has been raised to the top dead center”, and the compression drive motor 56 is energized. To stop the series of compression operations.

  Since the moving distance of the compression plate 30 from when the compression plate 30 starts reversing until it stops at the top dead center decreases as the amount of dust accumulated in the coarse dust chamber 18 increases, the amount of collected dust Can be considered to be in a linear relationship. The dust collection amount determination unit 58 notifies the user of the dust collection amount determined from the movement distance detected by the compression movement amount determination unit 57 by the dust collection amount notification unit 59. In particular, when the dust collection amount exceeds a predetermined amount, the full notification means 63 alerts the user and prevents driving in a full state, thereby avoiding cleaning in a low suction force state. The load of the electric blower 2 is made.

  Next, when the operation unit 8 is operated to start the operation of the vacuum cleaner, the control unit 52 sends a signal to the drive unit 54 to operate the electric blower 2. The suction force by the electric blower 2 reaches the floor suction tool 11 through the coarse dust chamber 18, the hose 6, and the extension pipe 10. Then, the air containing dust sucked from the floor suction tool 11 passes through the suction port 7 of the cleaner body 1 and enters the coarse dust chamber 18 straight from the suction port 17 of the dust collecting container body 15, and the primary filter A 28. Then, it hits the primary filter B29, where dust is collected and accumulated. Fine dust contained in the air that has passed through the primary filter A 28 and the primary filter B 29 is captured by the filter unit 16.

  In the present embodiment, when the operation of the vacuum cleaner is further stopped by operating the operation operation unit 8, the control means 52 detects that and performs the same operation as the dust compression operation at the start of operation. I have to. In the middle of driving the compression drive motor 56 in the compression direction, when the operation operation unit 8 is operated to start the operation of the electric vacuum cleaner, the drive in the compression direction is immediately stopped, The reversing process of the compression drive motor 56 is performed after 2 seconds, and after the compression plate 30 reaches the top dead center, the series of compression operations are completed, and then the electric blower 2 is operated.

  Next, disposal of dust that has been compressed and accumulated in the dust container 4 will be described.

  When removing the dust collection container 4 from the dust collection container storage part 5, it is only necessary to hold the container handle 12 and lift the dust collection container 4 upward. When the dust collecting container 4 is held on a trash box or the like and the container operation unit 23 is pushed, the connecting rod C46 is lowered, the buckle 22 is moved outward, and the lid 20 and the buckle 22 are moved. The locking is released, the lid 20 is opened by the urging force of the coil spring 21, and the compressed dust in the dust collecting container 4 falls into the trash box.

  At this time, the dust collection container detection means 62 detects that the dust collection container 4 has been taken out from the dust collection container storage 5, and sends a signal to the dust collection amount judgment means 58. In response to this, the dust collection amount judgment means 58 once erases the contents notified by the dust collection amount notification means 59 and / or the full notification means 63. Then, when the dust collection container detection means 62 detects that the dust collection container 4 is attached to the dust collection container storage 5 again, the compression operation is performed again, and the dust collection amount is re-determined, so that Notify the amount of dust collection.

  As described above, according to the present embodiment, the operation speed of the compression plate 30 in the compression direction is set to a speed having a sufficient margin for the strength and durability of the compression plate 30 and the compression drive motor 56. In addition, since the operation speed in the reverse direction is set as fast as possible, the durability can be improved with a simple configuration without significantly increasing the compression operation time. Also, when detecting the amount of dust by detecting the amount of load and the amount of movement of the compression plate 30, especially when detecting its bottom dead center / top dead center, the movement speed is slowed down, so the detection accuracy is also high. It has improved.

  When the electric blower 2 is driven by a user operation or the like during the compression operation, the compression operation is interrupted and the operation of returning the compression plate 30 to the predetermined origin position and the operation speed when returning to the origin position are performed. Is made as fast as possible, so that when the interruption is selected, the compression operation is quickly completed, so that the usability is improved.

  Since the operating speed and driving force of the compression plate 30 are switched according to the load applied to the compression plate 30, the power consumption, compression performance, and time required for the compression operation can be optimized, and it is easy to use and reliable. Can provide a high vacuum cleaner.

  As described above, the vacuum cleaner according to the present invention can always compress dust with a stable compressive force, has excellent durability, and is easy to use. Applicable to vacuum cleaners.

Whole perspective view of the electric vacuum cleaner in Embodiment 1 of this invention Side sectional view of the vacuum cleaner Partially missing perspective view of dust collector of the vacuum cleaner Cross section of the dust container Perspective view of the main part of the dust container storage part Control system block diagram of the vacuum cleaner

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body 2 Electric blower 4 Dust collection container 5 Dust collection container storage part 8 Operation operation part 15 Dust collection container main body 18 Coarse dust chamber 30 Compression plate (compression means)
31 Slider 32 Slider spring 33 Drive shaft 34 Rack gear 35 Gear B
38 Gear E
40 Bulkhead 51 Current detection means 52 Control means 53 Current detection means (load amount detection means)
54 drive means 56 compression drive motor 57 compression movement amount judgment means 58 dust collection amount judgment means 59 dust collection amount notification means 62 dust collection container detection means 63 full notification means 64 transmission gear unit (transmission means)
65 Rotational speed detection means 66 Compression drive unit

Claims (7)

An electric blower, a dust collecting container for collecting dust, a dust collecting container storage unit that is in communication with the electric blower and is detachably attached to the dust collecting container, and a compressing means disposed in the dust collecting container And compression drive means for driving the compression means, and compressing the dust in the dust collection container by the compression means so that more dust can be collected in the dust collection container. In the electric vacuum cleaner, the compression means is configured to be slidable in the direction of compressing the dust in the dust collecting container and in the opposite direction, and the operation speed in the compression direction by the compression drive means, A vacuum cleaner with a different operating speed in the reverse direction. After compressing the dust by driving the compression means in the compression direction, the operation is performed in the reverse direction to return to a predetermined position, and the operation speed in the compression direction is slower than the operation speed in the reverse direction. Item 1. A vacuum cleaner according to item 1. When the electric blower is driven by a user operation or the like during the compression operation, the compression operation is interrupted and the compression means is returned to a predetermined position. The electric vacuum cleaner according to claim 1, wherein the electric vacuum cleaner is faster than the compression operation speed. A load amount detection means for detecting a load amount applied to the compression drive means; and a compression speed variable means for varying the operation speed of the compression means, the load amount detected by the load amount detection means, and a compression speed variable means 2. The vacuum cleaner according to claim 1, wherein the operation speed of the compression means is changed by controlling the compression speed variable means according to a control state. The electric vacuum cleaner according to claim 4, wherein the operation speed of the compression means is decreased as the load applied to the compression means increases. A load amount detecting means for detecting a load amount applied to the compression driving means; and a driving force variable means for changing the driving force of the compression driving means; the load amount detected by the load amount detecting means; and the driving force. The electric vacuum cleaner according to claim 1, wherein the driving force is changed by controlling the driving force changing means in accordance with a control state of the variable means. The driving force of the compression means is increased as the amount of load applied to the compression means increases, and the driving force of the compression means is decreased when the load amount applied to the compression means exceeds a predetermined value. The vacuum cleaner described.

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