JP2019166123A - Vacuum cleaner - Google Patents

Abstract

To provide a vacuum cleaner that can stop rotation of a side brush without the need of removing the side brush when there is no need of rotating the side brush during cleaning.SOLUTION: A vacuum cleaner 1 includes a suction tool 2, a blower 9, an operation button 30 and a brush button 32, for example. The suction tool 2 includes a side brush 24. The operation button 30 is a button for driving or stopping the blower 9 when being manually operated by a user. The brush button 32 is a button for rotating or stopping the side brush 24 when being manually operated by a user.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vacuum cleaner.

  Patent Document 1 describes a vacuum cleaner. The vacuum cleaner described in Patent Document 1 includes a vacuum cleaner body and a suction tool. An electric blower is provided in the cleaner body. The suction tool includes a case, a side brush, and a motor. The side brush is detachable from the case. The motor drives the side brush. When the electric blower is driven, power supply to the motor is started.

JP 2002-28113 A

  In the vacuum cleaner described in Patent Document 1, when the side brush is attached to the case, the side brush always rotates when the electric blower is driven. If it is not necessary to rotate the side brush, the side brush must be removed from the case.

  The present invention has been made to solve the above-described problems. The objective of this invention is providing the vacuum cleaner which can stop the rotation, without removing a side brush, when it is not necessary to rotate a side brush during cleaning.

  A vacuum cleaner according to the present invention includes a case having a suction port formed on a lower surface thereof, a suction tool including a side brush partially protruding sideways from the case, and a blower that generates an air flow for sucking dust from the suction port. And a first operation means for driving and stopping the blower by a user's manual operation, and a second operation means for rotating and stopping the side brush by a user's manual operation.

  The vacuum cleaner according to the present invention includes a suction tool in which a suction port is formed, a handle for a user to move the suction tool, a blower that generates an air flow for sucking dust from the suction port, and a detection And a control device. The handle includes an operation means for driving and stopping the blower. The suction tool includes a case in which a suction port is formed on the lower surface, a side brush that partially protrudes laterally from the case, and a motor that generates a driving force for rotating the side brush. The detector detects the type of floor on which the lower surface of the case faces. The control device controls the motor based on the type of floor detected by the detector.

  The vacuum cleaner according to the present invention includes, for example, a first operation means for driving and stopping the blower by a user's manual operation, and a second operation means for rotating and stopping the side brush by a user's manual operation. With. If it is the vacuum cleaner which concerns on this invention, when it is not necessary to rotate a side brush during cleaning, the rotation can be stopped, without removing a side brush.

It is a figure which shows the example of the vacuum cleaner in Embodiment 1. FIG. The electrical connection example of the apparatus with which the vacuum cleaner was equipped is shown. It is a front view of a suction tool. It is a top view of a suction tool. It is a bottom view of a suction tool. It is a side view of a suction tool. It is a figure which shows the AA cross section of FIG. It is a top view which shows the other example of a suction tool. It is a side view which shows the other example of a suction tool. It is a figure which shows the other example of a vacuum cleaner. The electrical connection example of the apparatus with which the vacuum cleaner shown in FIG. 10 was equipped is shown. The example of the electrical connection of the apparatus with which the vacuum cleaner in Embodiment 2 was equipped is shown. It is a figure which shows the example of the hardware resource of a control apparatus. It is a figure which shows the other example of the hardware resource of a control apparatus.

  The present invention will be described with reference to the accompanying drawings. The overlapping description will be simplified or omitted as appropriate. In each figure, the same reference numerals indicate the same or corresponding parts.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating an example of the electric vacuum cleaner 1 according to the first embodiment. FIG. 1 shows a canister-type vacuum cleaner 1 as an example. The vacuum cleaner 1 includes a suction tool 2, an extension pipe 3, an operation body 4, a hose 5, and a main body 6, for example. FIG. 2 shows an example of electrical connection of devices provided in the vacuum cleaner 1.

  The suction tool 2 is connected to one end of the extension pipe 3. The suction tool 2 can be attached to and detached from the extension pipe 3. The extension pipe 3 can be expanded and contracted. The operating body 4 is connected to the other end of the extension pipe 3. The extension pipe 3 can be attached to and detached from the operation body 4. The operating body 4 includes a handle 7. An operating portion 8 is provided on the handle 7. The user of the vacuum cleaner 1 holds the handle 7 and moves the suction tool 2 when cleaning. The user operates the operation unit 8 with a hand holding the handle 7, for example.

  One end of the hose 5 is connected to the operating body 4. The other end of the hose 5 is connected to the main body 6. The hose 5 can be attached to and detached from the main body 6. The main body 6 includes a blower 9, a control device 10, and a dust collecting device 11, for example.

  A suction port 12 (not shown in FIG. 1) is formed in the suction tool 2. The blower 9 generates an air flow for sucking dust from the suction port 12. The dust sucked from the suction port 12 is collected in the dust collector 11. The control device 10 controls electric devices provided in the vacuum cleaner 1. For example, the control device 10 controls the electrical device based on information input from the operation unit 8. The blower 9 is controlled by the control device 10.

  FIG. 3 is a front view of the suction tool 2. FIG. 4 is a plan view of the suction tool 2. FIG. 5 is a bottom view of the suction tool 2. FIG. 6 is a side view of the suction tool 2. With respect to the suction tool 2, the upper and lower sides are specified as shown in FIG. 3 on the basis of the direction of the person who cleans with the handle 7. Similarly, front and rear and left and right are specified as shown in FIG. The suction tool 2 includes, for example, a case 20, a connection pipe 21, a rotating brush 22, a motor 23, a side brush 24, and a motor 25.

  As shown in FIG. 4, the case 20 has a rectangular shape as viewed from above. A suction port 12 for sucking dust is formed on the lower surface of the case 20. When the suction tool 2 is placed on the floor, the lower surface of the case 20 faces the floor. The connection pipe 21 extends obliquely upward from the rear center portion of the case 20. The space formed inside the connection pipe 21 leads to the space formed inside the case 20. One end of the extension pipe 3 is connected to the connection pipe 21.

  FIG. 7 is a view showing a cross section taken along the line AA of FIG. The rotating brush 22 is rotatably supported by the case 20. The rotating shaft 26 of the rotating brush 22 is disposed in the left-right direction in a space formed inside the case 20. A portion of the rotating brush 22 that extends downward from the rotating shaft 26 passes through the suction port 12. That is, at least a part of the rotating brush 22 protrudes downward from the case 20.

  The motor 23 generates a driving force for rotating the rotating brush 22. That is, the rotary brush 22 is driven to rotate by the motor 23. The motor 23 is supported by the case 20. The motor 23 is disposed in a space formed inside the case 20. The driving force of the motor 23 is transmitted to the rotating brush 22 by, for example, the belt 27. The motor 23 is electrically connected to the control device 10. The motor 23 is controlled by the control device 10.

  The side brush 24 is rotatably supported by the case 20. The rotating shaft 28 of the side brush 24 is disposed in the vertical direction, for example. The side brush 24 protrudes laterally from the case 20 when viewed from above. In the present embodiment, an example in which a part of the side brush 24 protrudes also in front of the case 20 when viewed from above is shown.

  The motor 25 generates a driving force for rotating the side brush 24. That is, the side brush 24 is rotationally driven by the motor 25. The motor 25 is supported by the case 20. The motor 25 is disposed in a space formed inside the case 20. The driving force of the motor 25 is transmitted to the side brush 24 by a transmission mechanism 29, for example. The motor 25 is electrically connected to the control device 10. The motor 25 is controlled by the control device 10.

  In the present embodiment, an example in which the side brushes 24 are arranged on the right side and the left side of the suction port 12 is shown. In this case, the right side brush 24 protrudes from the case 20 as viewed from above at a portion extending to the right side from the rotation shaft 28. The left side brush 24 protrudes from the case 20 when viewed from above at a portion extending leftward from the rotation shaft 28. The suction tool 2 preferably includes a first motor 25 for driving the right side brush 24 and a second motor 25 for driving the left side brush 24.

  FIG. 2 shows an example in which the operation unit 8 includes an operation button 30, a brush button 31, and a brush button 32.

  The operation button 30 is a button for driving and stopping the blower 9 by a user's manual operation, and corresponds to a first operation means. The control device 10 controls the blower 9 according to an operation performed on the operation button 30. For example, when the operation button 30 is pressed while the blower 9 is stopped, the control device 10 drives the blower 9. When the operation button 30 is pressed while the blower 9 is driven, the control device 10 stops the blower 9.

  The brush button 31 is a button for rotating and stopping the rotating brush 22 by a user's manual operation, and corresponds to a third operation means. The control device 10 controls the motor 23 in accordance with an operation performed on the brush button 31. For example, when the brush button 31 is pressed while the motor 23 is stopped, the control device 10 drives the motor 23. Thereby, the rotating brush 22 rotates. When the brush button 31 is pressed while the motor 23 is being driven, the control device 10 stops the motor 23. Thereby, the rotating brush 22 stops.

  The brush button 32 is a button for rotating and stopping the side brush 24 by a user's manual operation, and corresponds to a second operation means. The control device 10 controls the motor 25 according to the operation performed on the brush button 32. For example, when the brush button 32 is pressed while the motor 25 is stopped, the control device 10 drives the motor 25. Thereby, the side brush 24 rotates. If the brush button 32 is pressed while the motor 25 is being driven, the control device 10 stops the motor 25. Thereby, the side brush 24 stops.

  The operation button 30, the brush button 31, and the brush button 32 are examples of means that the user of the vacuum cleaner 1 operates by hand. For example, the operation button 30, the brush button 31, and the brush button 32 may be configured so that the operation button 30 and the brush button 31 are combined and shared as a single button. As another example, the operation unit 8 may include a button for switching the operation mode. For example, the control apparatus 10 controls the air blower 9 according to operation performed with respect to this button, and adjusts a suction power.

  As another example, the operation unit 8 may include a button for switching the rotation speed of the rotary brush 22. The control device 10 controls the motor 23 in accordance with the operation performed on this button and adjusts the rotational speed of the rotary brush 22. The rotation speed of the rotary brush 22 may be adjustable in multiple stages or may be adjusted in a stepless manner.

  As another example, the operation unit 8 may include a button for switching the rotation speed of the side brush 24. The control device 10 controls the motor 25 according to the operation performed on this button, and adjusts the rotational speed of the side brush 24. The rotational speed of the side brush 24 may be adjustable in multiple stages, or may be adjustable infinitely.

  In the example shown in the present embodiment, the user can drive or stop the blower 9 by operating the operation button 30. Further, the user can rotate or stop the side brush 24 by operating the brush button 32. For this reason, in the example shown in the present embodiment, the user can stop the rotation without removing the side brush 24 during cleaning. Moreover, the user can rotate the side brush 24 as needed during cleaning. The side brush 24 may be rotatable only when the blower 9 is driven.

  In the example shown in the present embodiment, the user can rotate or stop the rotating brush 22 by operating the brush button 31. The side brush 24 can be stopped when the rotary brush 22 is rotating. The side brush 24 is rotatable when the rotary brush 22 is stopped. For this reason, in the example shown in the present embodiment, the user can stop the side brush 24 without stopping the rotation of the rotating brush 22 during cleaning. The rotating brush 22 may be rotatable only when the blower 9 is driven. The rotating brush 22 may always rotate when the blower 9 is driven. In such a case, the operation unit 8 may not include the brush button 31.

  In the present embodiment, the example in which the brush button 31 and the brush button 32 are provided in the handle 7 has been described. The brush button 31 may be provided in the suction tool 2. The brush button 32 may be provided in the suction tool 2.

  In the present embodiment, the example in which the means that the user of the vacuum cleaner 1 operates by hand is a button has been described. This is an example. The above means are not limited to buttons.

  In the present embodiment, the example in which the side brush 24 is driven by the motor 25 has been described. This is an example. FIG. 8 is a plan view showing another example of the suction tool 2. FIG. 9 is a side view showing another example of the suction tool 2. In the example shown in FIGS. 8 and 9, the suction tool 2 includes, for example, a case 20, a connection pipe 21, a rotating brush 22, a motor 23 (not shown in FIGS. 8 and 9), a side brush 24, a lid 33, and a turbine. 34 is provided. In the example shown in FIGS. 8 and 9, the suction tool 2 does not include the motor 25.

  An intake port 35 is formed on the upper surface of the case 20. The space formed inside the connection pipe 21 communicates with the air inlet 35 via the space formed inside the case 20.

  The lid 33 opens and closes the intake port 35. The lid 33 is provided on the case 20. In the example shown in FIG. 8, the lid 33 slides in the left-right direction with respect to the case 20. The user can slide the lid 33 by hand.

  The turbine 34 generates a driving force for rotating the side brush 24 by an air flow from the air inlet 35 generated when the blower 9 is driven. That is, in the example shown in FIGS. 8 and 9, the side brush 24 is rotationally driven by the turbine 34. The turbine 34 is supported by the case 20. The turbine 34 is disposed in a space formed inside the case 20. The driving force of the turbine 34 is transmitted to the side brush 24 by a transmission mechanism 36, for example.

  FIG. 8 shows an example in which the side brushes 24 are arranged on the right side and the left side of the suction port 12 respectively. In such a case, as shown in FIG. 8, the suction tool 2 includes a first turbine 34 for driving the right side brush 24 and a second turbine 34 for driving the left side brush 24. Is preferred. In the example shown in FIG. 8, the case 20 is formed with a first intake port 35 corresponding to the right turbine 34 and a second intake port 35 corresponding to the left turbine 34. Further, the suction tool 2 is provided with a first lid 33 for opening and closing the right intake port 35 and a second lid 33 for opening and closing the left intake port 35.

  In the example shown in FIGS. 8 and 9, the user can drive or stop the blower 9 by operating the operation button 30. Further, the user can rotate or stop the side brush 24 by opening and closing the lid 33. For this reason, even if it is an example shown in FIG.8 and FIG.9, the user can stop the rotation, without removing the side brush 24 during cleaning. Moreover, the user can rotate the side brush 24 as needed during cleaning. In the example shown in FIGS. 8 and 9, the side brush 24 can rotate only when the blower 9 is driven.

  The lid 33 is an example of a second operating means that is manually operated by the user of the vacuum cleaner 1. The lid 33 is an example of a member that opens and closes the intake port 35. The air inlet 35 may be opened and closed by a member other than the lid 33. For example, the suction tool 2 may include a shielding plate disposed inside the case 20 as a member for opening and closing the air inlet 35.

  In the present embodiment, the example in which the vacuum cleaner 1 is a canister type has been described. This is an example. FIG. 10 is a diagram illustrating another example of the electric vacuum cleaner 1. FIG. 10 shows an example in which the vacuum cleaner 1 is a stick type. The vacuum cleaner 1 shown in FIG. 10 includes a suction tool 2, an extension pipe 3, and a main body 13, for example. FIG. 11 shows an example of electrical connection of devices provided in the vacuum cleaner 1 shown in FIG.

  The suction tool 2 and the extension pipe 3 are the same as any of the examples described above. Hereinafter, an example in which the side brush 24 is driven by the motor 25 will be described.

  The other end of the extension pipe 3 is connected to the main body 13. The extension pipe 3 can be attached to and detached from the main body 13. The main body 13 includes, for example, a secondary battery 14, a blower 9, a control device 10, a dust collector 11, and a handle 15. The secondary battery 14 supplies power to the blower 9, the control device 10, the motor 23, and the motor 25, for example.

  The handle 15 has the same function as that of the handle 7 described above. For example, the handle 15 includes the operation unit 8. The user of the vacuum cleaner 1 holds the handle 15 and moves the suction tool 2 when cleaning. The user operates the operation unit 8 with a hand having the handle 15, for example. FIG. 11 shows an example in which the operation unit 8 includes an operation button 30, a brush button 31, and a brush button 32 as in the example shown in FIG. 2.

  When the vacuum cleaner 1 includes the secondary battery 14, the control device 10 may change the control of the motor 23 or the motor 25 according to the remaining amount of the secondary battery 14. For example, cleaning itself is possible even if the rotating brush 22 and the side brush 24 are not rotating. For this reason, the control apparatus 10 does not need to drive the motor 23 or the motor 25, when the remaining amount of the secondary battery 14 is less than a reference value. For example, when the remaining amount of the secondary battery 14 is less than the reference value, the control device 10 does not drive the motor 23 even if the brush button 31 is pressed. Further, even if the brush button 32 is pressed, the motor 25 is not driven. Further, the rotational speed of the motor 23 or the motor 25 may be decreased. Thereby, the time which can be cleaned with the vacuum cleaner 1 can be extended.

Embodiment 2. FIG.
In the first embodiment, the example in which the side brush 24 is rotated or stopped by a manual operation by the user has been described. In the present embodiment, an example in which the side brush 24 is automatically rotated and stopped will be described.

  FIG. 12 shows an example of electrical connection of devices provided in the vacuum cleaner 1 according to the second embodiment. FIG. 12 shows an example in which the vacuum cleaner 1 is a stick type. The vacuum cleaner 1 may be a canister type. That is, the vacuum cleaner 1 may not include the secondary battery 14. In this embodiment, differences from the example disclosed in Embodiment 1 will be described in detail. For the matters not described in the present embodiment, any example described in the first embodiment may be adopted.

  The vacuum cleaner 1 in the present embodiment further includes a detector 16. The operation unit 8 includes a driving button 30 and a brush button 31. In the example illustrated in FIG. 12, the operation unit 8 does not include the brush button 32.

  The detector 16 detects the type of floor on which the lower surface of the case 20 faces. The detection by the detector 16 may be performed on condition that the suction tool 2 is placed on the floor. For example, the suction tool 2 is provided with a switch that is turned on when the suction tool 2 is placed on the floor. The detector 16 detects the floor type when this switch is on. The detector 16 does not perform detection processing if this switch is off.

  The detector 16 is provided in the suction tool 2, for example. The detector 16 may detect the type of floor by irradiating infrared rays or the like.

  As another example, the detector 16 may detect the floor type based on the value of the current flowing through the motor 25. For example, if the current value of the motor 25 is greater than a threshold value, the detector 16 detects that the floor is a carpet. If the current value of the motor 25 is equal to or less than the threshold value, the detector 16 detects that the floor is flooring. Similarly, the floor type may be detected based on the value of the current flowing through the motor 23 that drives the rotary brush 22.

  As another example, the detector 16 may detect the type of the floor based on the degree of vacuum in the space formed inside the suction tool 2. The space is a space immediately above the suction port 12. For example, the rotating brush 22 is disposed in the space. For example, if the degree of vacuum in the space is higher than a threshold value, the detector 16 detects that the floor is flooring. The detector 16 detects that the floor is a carpet if the degree of vacuum in the space is equal to or less than a threshold value.

  The control device 10 controls the motor 25 based on the floor type detected by the detector 16. For example, when the detector 16 detects that the floor is flooring, the control device 10 stops the motor 25. Thereby, the side brush 24 does not rotate. On the other hand, when the detector 16 detects that the floor is a carpet, the control device 10 drives the motor 25. Thereby, the side brush 24 rotates. When the detector 16 detects that the floor is flooring, the control device 10 may drive the motor 25. Thereby, the side brush 24 rotates. On the other hand, when the detector 16 detects that the floor is a carpet, the control device 10 may stop the motor 25. Thereby, the side brush 24 does not rotate.

  In the present embodiment, an example in which the operation unit 8 does not include the brush button 32 has been described. The operation unit 8 may include an operation button 30, a brush button 31, and a brush button 32. In such a case, the operation unit 8 may further include a switch or the like for switching the setting of the side brush 24 to “manual” or “automatic”. For example, if the setting of the side brush 24 is “manual”, the control device 10 controls the motor 25 according to the operation performed on the brush button 32. If the setting of the side brush 24 is “automatic”, the control device 10 controls the motor 25 according to the kind of floor detected by the detector 16.

  FIG. 13 is a diagram illustrating an example of hardware resources of the control device 10. The control device 10 includes a processing circuit 37 including, for example, a processor 38 and a memory 39 as hardware resources. The control device 10 implements each function described above by executing a program stored in the memory 39 by the processor 38.

  The processor 38 is also called a CPU (Central Processing Unit), a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, or a DSP. As the memory 39, a semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, or a DVD may be employed. Semiconductor memories that can be used include RAM, ROM, flash memory, EPROM, EEPROM, and the like.

  FIG. 14 is a diagram illustrating another example of hardware resources of the control device 10. In the example illustrated in FIG. 14, the control device 10 includes a processing circuit 37 including, for example, a processor 38, a memory 39, and dedicated hardware 40. FIG. 14 shows an example in which some of the functions of the control device 10 are realized by the dedicated hardware 40. All the functions of the control device 10 may be realized by the dedicated hardware 40. As the dedicated hardware 40, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof can be adopted.

  DESCRIPTION OF SYMBOLS 1 Vacuum cleaner, 2 Suction tool, 3 Extension pipe, 4 Operation body, 5 Hose, 6 Main body, 7 Handle, 8 Operation part, 9 Blower, 10 Control apparatus, 11 Dust collector, 12 Suction port, 13 Main body, 14 Secondary battery, 15 Handle, 16 Detector, 20 Case, 21 Connection pipe, 22 Rotating brush, 23 Motor, 24 Side brush, 25 Motor, 26 Rotating shaft, 27 Belt, 28 Rotating shaft, 29 Transmission mechanism, 30 Operation button (First operation means), 31 brush button (third operation means), 32 brush button (second operation means), 33 lid (second operation means), 34 turbine, 35 air inlet, 36 transmission mechanism, 37 processing circuit , 38 processor, 39 memory, 40 dedicated hardware

Claims (15)

A suction tool including a case having a suction port formed on the lower surface and a side brush partially protruding sideways from the case;
A blower for generating an airflow for sucking in dust from the suction port;
First operating means for driving and stopping the blower by a user's manual operation;
A second operating means for rotating and stopping the side brush by a user's manual operation;
Vacuum cleaner with A handle for the user to hold when moving the suction tool;
The electric vacuum cleaner according to claim 1, wherein the first operation means and the second operation means are provided on the handle. A handle for the user to hold when moving the suction tool;
The first operating means is provided on the handle;
The vacuum cleaner according to claim 1, wherein the second operation means is provided in the suction tool. An air inlet is formed in the case,
The suction tool further comprises a turbine;
The turbine generates a driving force for rotating the side brush by an airflow from the intake port generated when the blower is driven,
The electric vacuum cleaner according to claim 3, wherein the second operation means is a member for opening and closing the intake port. A control device;
The suction tool further includes a motor that generates a driving force for rotating the side brush,
The said control apparatus is a vacuum cleaner as described in any one of Claims 1-3 which controls the said motor according to operation performed with respect to the said 2nd operation means.   The vacuum cleaner according to claim 5, further comprising a secondary battery that supplies electric power to the blower and the motor.   The vacuum cleaner according to claim 6, wherein the control device does not drive the motor or reduces the rotation speed of the motor when the remaining amount of the secondary battery is less than a reference value.   The electric vacuum cleaner according to any one of claims 1 to 7, wherein the rotation speed of the side brush can be adjusted in multiple steps or steplessly. The suction tool further includes a rotating brush partially protruding downward from the case,
The vacuum cleaner according to any one of claims 1 to 8, wherein the side brush can be stopped when the rotating brush is rotating, and can be rotated when the rotating brush is stopped. . A handle for the user to hold when moving the suction tool;
The suction tool further includes a rotating brush partially protruding downward from the case,
The vacuum cleaner according to claim 1, wherein the handle or the suction tool further includes third operating means for rotating and stopping the rotating brush by a user's manual operation. A suction tool formed with a suction port;
A handle for the user to hold when moving the suction tool;
A blower for generating an airflow for sucking in dust from the suction port;
A detector;
A control device;
With
The handle includes operation means for driving and stopping the blower,
The suction tool is
A case in which the suction port is formed on the lower surface;
A side brush partly protruding sideways from the case;
A motor for generating a driving force for rotating the side brush;
With
The detector detects the type of floor that the lower surface of the case is facing,
The said control apparatus is a vacuum cleaner which controls the said motor based on the kind of floor which the said detector detected.   The vacuum cleaner according to claim 11, wherein the detector detects a floor type based on a current value of the motor.   The electric cleaning according to claim 11, wherein the detector detects a floor type based on a current value of a second motor that generates a driving force for rotating a rotating brush partially protruding downward from the case. Machine.   The vacuum cleaner as described in any one of Claims 11-13 further provided with the secondary battery which supplies electric power to the said air blower and the said motor.   The vacuum cleaner according to claim 14, wherein the control device does not drive the motor or reduces the rotational speed of the motor when the remaining amount of the secondary battery is less than a reference value.

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