KR20090105048A - Vacuum cleaner - Google Patents

Abstract

PURPOSE: A vacuum cleaner is provided to empty a dust collecting container easily, and to increase the storing amount of the dust by compressing the dust stored in the dust collecting container with improved structure of the vacuum cleaner. CONSTITUTION: A vacuum cleaner includes a main body, a driving motor, and a dust collecting device. The main body is formed on a mounting part. The driving motor(200) is equipped on the main body. The dust collecting device(100) is equipped on a mounting part attachably. The dust collecting device includes a dust collecting main body, a lower cover, and a pressurization member. The dust collecting main body(110) has a dust storage. The lower cover(120) is formed on the bottom of the dust collecting main body, and is selectively opened. The pressurization member decreases volume of the dust stored.

Description

Vacuum cleaner {Vacuum cleaner}

An embodiment of the present invention relates to a vacuum cleaner.

Embodiments of the present invention relate to a vacuum cleaner, and more particularly, to improve the structure of the vacuum cleaner to compress the dust stored in the dust collecting container and at the same time the amount of dust stored in the dust collecting container by using an encoder is detected. It is about.

In general, a cleaner is a device that sucks air containing a foreign material by using a suction force generated by a suction motor mounted inside the main body, and then filters the foreign material in the main body.

On the other hand, the air sucked into the cleaner body by the driving of the suction motor is moved to the dust separator to separate the foreign matter in the air. In addition, foreign matters such as dust separated in the dust separator are discharged and introduced into the dust collector, and the air from which the dust is separated is generally discharged to the outside through a predetermined flow path.

In addition, a predetermined flow path or a branch flow path may be provided inside the cleaner body to allow the sucked air to move to the dust separation unit. In addition, the air containing the foreign matter is moved into the dust separation unit through the flow path and the dust in the air is subjected to the process of filtering.

However, in the related art, the capacity of the dust collecting device is limited, so that the dust collecting device needs to be cleaned every time the cleaner is used several times.

In addition, there was a problem that it is difficult to determine how much dust is accumulated in the dust collecting container, and accordingly there was a problem that the dust is continuously sucked into the dust collecting container in excess of the capacity of the dust collecting container and the cleaning performance is lowered.

In addition, when applying a structure to compress the dust to the dust collector there is a structurally difficult problem that the cover that can be opened and closed at the lower end of the dust collector. In this case, when the cover is to be applied to the upper end of the dust collector, and the dust stored in the dust collector is to be emptied, there is a problem that the dust collector has to be turned upside down.

The dust collecting apparatus of the vacuum cleaner according to the embodiment of the present invention has been proposed to solve the above problems, and improves the structure of the vacuum cleaner so as to compress the dust stored in the dust collecting container and simultaneously open the lower part of the dust collecting container. It is therefore an object of the present invention to provide a vacuum cleaner which allows the dust storage amount of the dust collecting container to be increased and the dust can be easily emptied.

In addition, the dust collecting device is intended to be provided with an encoder for allowing the rotatable angle of the pressing member to be recognized, so that the amount of dust collected in the dust collecting container is sensed.

According to an embodiment of the present invention, a vacuum cleaner includes: a cleaner body having a mounting portion; and a driving motor provided to the cleaner body; And a dust collecting apparatus detachably provided to the mounting portion, wherein the dust collecting apparatus includes: a dust collecting body in which a dust storage unit is formed; A lower cover provided below the dust collecting body and selectively opened; And a pressurizing member rotatably provided in the dust storage unit to reduce the volume of the stored dust, and the cleaner body further includes an encoder to sense the amount of rotation of the pressurizing member.

According to another aspect of the present invention, a vacuum cleaner includes: a cleaner body having a mounting portion formed thereon, a driving motor provided to the cleaner body; and a dust collecting device detachably provided at the mounting portion; And a pressurizing member rotatably provided in the dust collecting device to reduce the volume of the stored dust, wherein the cleaner body includes a gear for driving a driving force of the driving motor to the pressurizing member, and is connected to the gear, The encoder further includes an encoder for sensing the rotation amount of the pressing member.

According to an embodiment of the present invention by the above means, even if the foreign matter accumulated in the dust storage unit formed in the dust collecting apparatus can compress the foreign material by the dust compression structure to reduce the volume of the foreign matter, foreign matter to be stored in the dust collecting apparatus There is an advantage that the amount of.

In addition, by connecting the gear member and the encoder to rotate the pressing member, the rotation angle of the pressing member can be recognized by the encoder, and thus can detect the amount of dust inside the dust collecting container, so that the user when cleaning the dust collecting container There is an advantage that can be easily known.

In addition, the cover is provided at the lower end of the dust collector has an advantage that the user can easily open and close the cover to clean the foreign material.

Hereinafter, with reference to the drawings will be described a specific embodiment of the present invention. However, the spirit of the present invention is not limited to the embodiments presented, and those skilled in the art who understand the spirit of the present invention can easily suggest other embodiments within the scope of the same idea.

1 is a perspective view of a vacuum cleaner equipped with a dust collecting device according to an embodiment of the present invention, Figure 2 is a perspective view of the vacuum cleaner in a state where the dust collecting device according to an embodiment of the present invention is separated.

1 and 2, a vacuum cleaner 1 according to an embodiment of the present invention includes a main body 10 forming a cleaner appearance, and foreign substances such as dust in the air sucked into the vacuum cleaner 1. A dust separator is included to separate.

The dust separating apparatus includes a dust separating unit 70 provided in the main body 10 to detach dust from the air, and a detachable portion of the dust collecting unit 70, detachable from the dust separating unit 70. A dust collecting device 100 in which foreign materials are stored is included.

The main body 1 further includes an air inlet 30 through which air sucked from the surface to be cleaned flows into the main body 10, and a moving wheel 40 for smoothly moving the vacuum cleaner 1. The main body handle 20 may be configured to allow a user to easily grip the vacuum cleaner 1.

Although not shown in the drawing, the vacuum cleaner 1 includes a suction nozzle for suctioning foreign substances on the surface to be cleaned, an extension pipe for guiding air sucked from the suction nozzle toward the cleaner body, and a handle coupled with the extension pipe. And a connecting pipe connecting the air passing through the extension pipe to the cleaner body.

In detail, the main body 10 is provided on the mounting unit 50 on which the dust collecting apparatus 100 is mounted, and on at least one surface of the mounting unit 50, and the dust collecting apparatus 100 is mounted on the mounting unit 50. The lower seating surface 52 on which the lower end of the dust collecting device 100 is mounted is provided.

In addition, the dust separation unit 70, the cyclone portion 71 in which a cyclone flow is generated in order to separate the dust in the air sucked into the dust separation unit 70, and separated by the cyclone flow A dust discharge unit 72 is provided for allowing the collected dust to be discharged to the dust collecting device 100.

Here, the dust discharge unit 72 is in communication with the dust collector 100 in a state in which the dust collector 100 is mounted to the main body 10.

Although not shown in the drawing, the cyclone unit 71 may include a plurality of air intake units for allowing air containing dust to be sucked into the cyclone unit 70.

Here, the air suction unit may be formed at both sides of the cyclone unit 71, and the dust discharge unit 72 may be located between the plurality of air suction units. By the configuration as described above, the air is introduced from both sides of the cyclone portion 71 and moved in the central direction to separate the dust in the air. In addition, the separated dust may be discharged to the dust collecting apparatus 100.

3 is a perspective view illustrating a closed state of a lower cover of a dust collecting apparatus according to a first embodiment of the present invention, and FIG. 4 is a perspective view illustrating an open state of a lower cover of a dust collecting apparatus according to a first embodiment of the present invention. .

3 and 4, in the dust collecting apparatus 100 according to the embodiment of the present invention, a dust storage unit 111 in which dust is stored is formed, and a dust collecting body 110 having a lower surface thereof opened, and the dust collecting body It is provided on the lower side of the 110, the lower cover 120 for selectively shielding the lower surface of the dust collecting body 110, and provided on one side of the dust collecting body 110, the user to the dust collecting device 100 A dust collecting handle 150 is included to facilitate gripping.

And, at least a portion of the upper surface of the dust collecting body 110, the dust inlet 102 to discharge the dust separated from the dust separation unit 70 to be introduced into the dust collector 100.

Here, the dust inlet 102 is in communication with the dust discharge unit 72 in a state in which the dust collector 100 is mounted to the main body 10.

In detail, the inside of the dust collecting body 110, the fixing member 130 is fixed to the inner surface of the dust collecting body 110 as a unit for the foreign material discharged into the dust storage unit 111 is compressed, and A pressing member 140 rotated in the direction of the fixing member 130 to pressurize dust, and a rotating shaft 142 installed at an approximately central portion of the dust storage unit 111 to provide a rotation center of the pressing member 140. 5).

At least one surface of the fixing member 130 is fixed to one side of the dust storage unit 111, and the pressing member 140 is clockwise or counterclockwise around the fixed rotating shaft 142. It is provided to rotate.

In addition, the rotation shaft 142 is formed with a lower protrusion 146 extending downward and protruding downward of the lower cover 120. In addition, the lower cover 120 has a connection hole 160 formed at the position corresponding to the lower protrusion 146 so that the lower protrusion 146 protrudes to the lower side of the lower cover 120.

On the other hand, on the outer circumferential surface of the dust collecting body 110, a pressing portion 180 operable to open the lower cover 120 is provided. In this case, the pressing unit 180 may be moved downward by an operation of pressing by the user, and accordingly the locking of the lower cover 120 may be released to open.

In addition, the lower cover 120 may be coupled to the dust collecting main body 110 so as to be pivotable downwardly around the hinge portion 125. Description of the configuration and operation thereof will be described later together with the drawings.

5 is a cross-sectional view taken along the line II ′ of FIG. 1.

Referring to FIG. 5, in the dust collecting apparatus 100 according to the exemplary embodiment of the present invention, a dust collecting body 110 having an external appearance and having the dust storage portion 111 formed thereon, and a lower side of the dust collecting body 110. A lower cover 120 that is provided and rotatably coupled around the hinge portion 125, and a fixing member 130 provided to the dust storage unit 111 and fixed to an inner side surface of the dust collecting body 110. And a pressing member 140 provided to be rotatable in the direction of the fixing member 130.

In detail, a fixed shaft 132 provided on one side of the fixing member 130 is provided at a substantially center portion of the dust storage unit 111. Here, the fixing shaft 132 is formed integrally with the fixing member 130, it may be fixed to the upper inner surface of the dust collecting body (110). The other side of the fixing member 130 may be connected to one side surface of the dust collecting body 110, and the fixing member 130 may be integrally formed with the dust collecting body 110.

In addition, the inside of the fixed shaft 132, the rotational axis 142 of the hollow shape is provided to provide a center of rotation of the pressing member 140, the hollow inside. In addition, the pressing member 140 may be formed to extend outward from the outer circumferential surface of the rotation shaft 142. Accordingly, the pressing member 140 may be rotated at the same time as the rotation shaft 142.

In addition, one side of the rotating shaft 142, the rotating member 104 and the rotating central portion 106 to be rotatable in a state supported by the upper end of the dust collecting body 110 is provided do.

Here, the rotation center 106 is fixed to the upper end of the dust collecting body 110, the rotation member 104 may be rotated around the rotation center (106).

And, at least a portion of the inner circumferential surface of the rotating shaft 142, the friction generating portion 142a in contact with the inner surface of the rotating member 104 is formed. In addition, the rotation shaft 142 and the rotation member 104 may be rotated at the same time by the friction force generated in the friction generating unit 142a.

The friction generating unit 142a may be formed in a polygon in order to prevent the rotating member 104 from turning while the rotating shaft 142 is rotated. The outer surface of the rotating member 104 may be formed in a polygon corresponding to the shape of the friction generating unit 142a.

In addition, a fastening member 144 is provided at one side of the rotating member 104 to support the pressing member 140. In addition, at least a portion of the rotation shaft 142 is formed with a stepped portion 142b supported upward by the fastening member 144.

As described above, the rotation shaft 142 and the pressing member 140 may be rotated in a state supported by the upper end of the dust collecting body 110. The lower end of the rotating shaft 142 and the pressing member 140 forms a free end that is not connected to the lower cover 120.

As a result, the rotating member 104 is supported inside the fixed shaft 132, and the rotating shaft 142 is supported by the rotating member 104 by the fastening member 144. That is, the rotation shaft 142 and the pressing member 140 can be seen that the upper portion is supported by a fixed shaft 132 is fixed to the upper surface of the dust collecting body (110).

Therefore, in the process of opening the lower cover 120, the rotating shaft 142 and the pressing member 140 is not opened downward, so that no interference with the lower cover 120 is opened. As a result, the lower cover 120 can be easily opened by itself.

If the rotating shaft 142 and the pressing member 140 are connected to the lower cover 120, the rotating shaft 142 and the pressing member 140 is a process in which the lower cover 120 is opened At the same time will be rotated with the lower cover 120. Then, a problem occurs that interference occurs with the dust collecting body 110 due to the rotation radius of the pressing member 140.

And, in order to solve this problem, a problem arises in that the lower cross-sectional area of the dust collecting body 110 is wider than the upper part.

As a result, by the configuration as in the present embodiment, there is no fear that the above problems are generated, and there is an advantage that the lower cover 120 can be easily opened downward.

In addition, a lower protrusion 146 protruding downward of the lower cover 120 and having a “T” shape is formed below the rotation shaft 142.

In addition, the lower cover 120 has a connection hole 160 formed therein to allow the lower protrusion 146 to protrude to the lower side of the lower cover 120 while the lower cover 120 is closed.

That is, the connection hole 160 may be formed at a position corresponding to the lower protrusion 146. Therefore, the lower protrusion 146 and the connection hole 160 do not interfere with each other while the lower cover 120 is opened and closed.

In addition, a lower side of the lower protrusion 146, a drive motor 200 for providing a driving force for the rotation of the pressing member 140 and the rotating shaft 142, the drive motor 200 and the motor shaft 202 The first gear 210 is connected by a), and the second gear 220 is interlocked with the first gear 210 is included.

Here, the first gear 210 and the second gear 220 is rotated by the drive motor 200, the driving force of the drive motor 200 to the pressing member 140 and the rotating shaft 142. It can be said to be a power transmission member to be transmitted.

In addition, the driving motor 200, the first gear 210, and the second gear 220 may be provided inside the main body 10. In addition, the first gear 210 and the second gear 220 may be a general gear having a plurality of teeth, for example, a spur gear.

In addition, an upper groove 221 may be formed at an upper portion of the second gear 220 to insert one end of the lower protrusion 146. That is, the lower protrusion 146 is inserted into the upper groove 221 and rotated by the rotation of the second gear 220. Accordingly, the rotation shaft 142 may be rotated.

That is, the second gear 220, the rotation shaft 142, and the pressing member 140 may be integrally rotated.

In addition, an encoder 230 for recognizing a rotation angle of the pressing member 140 and an encoder for connecting the encoder 230 and the second gear 220 to the lower side of the second gear 220. An axis 231 is provided.

A lower groove 222 is formed below the second gear 220 to allow the encoder shaft 231 to be inserted into the second gear 220.

Here, the encoder 230 refers to a sensor for converting the amount of mechanical displacement in the rotation direction to a digital amount. Although not shown in the drawing, the encoder 230 may be provided with a slit disc forming a scale. Here, a plurality of slits may be formed along the circumferential direction of the disc.

Meanwhile, in the process of rotating the original slit, light may be projected onto the slit, and the signal (number of pulses) of the optical pulses passing through the slit may be converted into position information of rotation.

Therefore, when the encoder 230 is coupled to the second gear 220, the rotation information of the second gear 220 and the pressing member 140 may be read.

In detail, the encoder 230 may allow information about the number of rotations of the second gear 220, the rotation direction, the rotation angle, and the like. Similarly, information about the number of rotations of the pressing member 140, the direction of rotation, the angle of rotation, and the like may be grasped.

That is, when the second gear 220 is rotated, the encoder shaft 231 is rotated, and the encoder 230 can grasp the rotation information of the encoder shaft 231.

On the other hand, in the process of the second gear 220 is rotated, the outer surface of the lower protrusion 146 may be formed in a polygonal shape so that the lower protrusion 146 is prevented from falling. Similarly, the shape of the upper groove 221 and the lower groove 222 may be formed in a polygon corresponding to the lower protrusion 146.

Power may be directly transmitted from the driving motor 200 to the second gear path 220. That is, the first gear 210 may be omitted, and the second gear 220 may be directly connected to the driving motor 200.

In this case, the motor shaft 202 may be connected between the second gear 220 and the driving motor 200, and the motor shaft 202 may be inserted into the encoder 230.

On the other hand, the second gear 220 may receive power from the drive motor 200 to transfer power to the lower protrusion 146. In addition, the encoder 230 may detect the amount of rotation of the second gear 220 and the lower protrusion 146 according to the rotation of the motor shaft 202.

6 is a view showing the dust compression action in the dust collector according to an embodiment of the present invention.

Referring to FIG. 6, the pressing member 140 according to the exemplary embodiment of the present invention may rotate in a clockwise or counterclockwise direction with respect to the fixing member 130.

As described above, when power is applied to the driving motor 200, a plurality of gears 210 and 220 are rotated. In addition, the downward protrusion 146 is rotated while being connected to the second gear 220, and thus the rotation shaft 142 is rotated.

In addition, as the rotation shaft 142 is rotated, the pressing member 140 may be rotated.

On the other hand, the dust collected in the dust storage unit 111 is guided by the rotating pressing member 140, can be moved to both sides of the fixing member 130 and compressed.

Then, when the amount of dust stored in the dust storage unit 111 is increased, the volume of the compressed dust is increased.

In addition, the pressing member 140 may vary in the range rotated by the amount of dust in the dust storage unit 111. That is, the rotation of the pressing member 140 may be rotated in the opposite direction when the rotation of the pressing member 140 is restricted.

In this case, a synchronous motor may be applied to the motor 200. When the reaction force of a predetermined magnitude or more is applied to the rotation direction of the motor, the synchronized motor may be controlled to stop the power supply for a moment and then rotate in the opposite direction.

As shown in FIG. 6, the pressing member 140 may be rotated in both directions about the dust 300 formed on both sides of the fixing member 130.

That is, the pressing member 140 may be rotated within an angle range of "α" in the dust storage unit 111.

In addition, the encoder 230 recognizes the amount of rotation of the pressing member 140, that is, the rotation range α. If it is recognized that the rotation range α of the pressing member 140 is formed at a predetermined angle or less, for example, at an angle of 90 degrees or less, the encoder 230 controls the information on the rotation range to be controlled. To deliver).

Then, the controller recognizes that the dust 300 is filled in the dust storage 111.

In this case, the controller may allow a user to display a warning to the user that the dust storage amount of the dust collecting apparatus is full.

That is, the controller itself may be a warning sound, or a speaker is mounted on the outside of the cleaner to hear a warning message. Alternatively, the display unit may be provided in the vacuum cleaner so that the amount of dust stored in the dust collecting apparatus may be checked.

By the configuration as described above, the encoder 230 has an advantage that can easily detect the amount of dust stored in the dust storage unit by grasping the rotation range of the pressing member 140.

7 is a perspective view showing a structure in which the lower cover of the dust collecting apparatus according to the embodiment of the present invention is opened, and FIGS. 8 and 9 are perspective views showing a state in which the lower cover of the dust collecting apparatus is opened.

7 to 9, in the dust collecting apparatus 100 according to the embodiment of the present invention, the catching unit 181 is formed on the lower side of the dust collecting apparatus 100 and is formed on the lower cover 120. A locking end 182 for performing the operation, a pressing part 180 for opening and closing the lower cover 120 shielding the dust collecting device 100, and a guide for guiding the movement of the pressing part 180. Part 183 is formed.

On the other hand, one side of the lower cover 120 includes a locking portion 181 to the locking end 182 and the locking operation is performed.

In detail, the pressing unit 180 is formed to be detachable from the dust collecting device 100, the movement is guided up and down by the guide unit 183.

In addition, the guide part 183 is formed on a side surface of the dust collecting device 100, and is formed in line with the locking part 181 when the lower cover 120 is coupled to the dust collecting device 300. do. In addition, the cross section of the guide portion 183 is formed in a "┻" shape, the pressing portion 180 is formed in a shape corresponding to the guide portion 183 to be guided to the guide portion 183.

In addition, the locking end 182 is formed to protrude by a predetermined length at the lower end of the dust collecting device 100, and is formed on both sides at a predetermined interval to catch both ends of the locking portion 181. The interval between the locking end 182 is to stop the movement of the pressing unit 180 when the locking unit 181 is separated from the locking end 182 by the pressing unit 180. It is formed smaller than the width of the pressing unit 180. Therefore, the pressing unit 180 is stopped by the locking end 182 so that it is not separated from the dust collecting device 100.

On the other hand, the locking portion 181 is formed with projections 184 on both sides in order to be caught and fixed to the locking end 182 when the lower cover 120 and the dust collecting device 100 is coupled. In addition, a predetermined groove 185 is formed to enable elastic movement so that the locking portion 181 is coupled to or separated from the locking end 182. Accordingly, the locking part 181 is elastically moved left / right when a force is transmitted by the pressing part 180, so that the locking part 181 is engaged or separated from the locking end 182.

Hereinafter, the opening and closing process of the dust collecting apparatus 100 will be described.

First, when the user grips the dust collecting handle 150, pressing the upper side of the pressing unit 180 with a predetermined hand with another hand, a predetermined force is transmitted to the locking unit 181, and the locking unit ( When a force is transmitted to the 181, the locking portion 181 is elastically moved due to the formation of the groove 185. That is, since the shape of the locking portion 181 is flatly deformed and the shape of the locking portion 181 is deformed flat, a space in which the protrusion 184 can be separated from the locking end 182 is formed. The locking portion 181 is separated from the locking end 182. At this time, the pressing unit 180 is stopped by the locking end 182 is no longer moved to the lower side.

On the other hand, after the cleaning operation of the dust collecting device 100 is finished, the lower cover 120 should be coupled to the dust collecting device 100. In detail, the locking portion 181 is pushed upward. When the locking unit 181 is pushed upward, the locking unit 182 meets the locking end 182, and when the locking unit 182 meets the locking end 182, the locking unit 181 performs a predetermined elastic movement and is flatly deformed. . Then, the locking portion 181 is able to move between the locking end 182, the coupling process is completed when the projection 184 passes through the locking end 182.

There is an advantage that the convenience of use of the dust collector is improved by the operation structure and the operation method as described above.

1 is a perspective view of a vacuum cleaner equipped with a dust collecting device according to an embodiment of the present invention.

2 is a perspective view of a vacuum cleaner in a state in which the dust collecting apparatus according to the embodiment of the present invention is separated.

Figure 3 is a perspective view showing a closed state of the lower cover of the dust collector according to an embodiment of the present invention.

Figure 4 is a perspective view showing an open state of the lower cover of the dust collector according to an embodiment of the present invention.

5 is a cross-sectional view taken along the line II ′ of FIG. 1.

6 is a view showing a dust compacting action in the dust collector according to the embodiment of the present invention.

7 is a perspective view showing a structure in which the lower cover of the dust collecting apparatus according to the first embodiment of the present invention is opened.

8 and 9 are perspective views showing the lower cover of the dust collector is opened.

Claims (10)

A cleaner body in which a mounting portion is formed; A drive motor provided to the cleaner body; And Includes a dust collector detachably provided to the mounting portion, In the dust collector, Dust collecting body is formed dust storage unit; A lower cover provided below the dust collecting body and selectively opened; And A pressurizing member rotatably provided in the dust storage unit is included to reduce the volume of stored dust. In the cleaner body, The vacuum cleaner further comprises an encoder for sensing the amount of rotation of the pressing member. The method of claim 1, In the cleaner body, At least one gear for transmitting the driving force of the drive motor to the pressing member is included, wherein the gear is connected to the motor shaft of the vacuum cleaner. The method of claim 2, The encoder is provided between the gear and the drive motor, the motor shaft is inserted into the encoder. The method of claim 2, The encoder is provided with an encoder shaft which is the center of rotation of the encoder, the encoder shaft is connected to one side of the vacuum cleaner. The method of claim 1, The dust storage unit, A rotating shaft for guiding the rotation of the pressing member and a fixed shaft fixed to the upper portion of the dust collecting body further includes, The rotating shaft is a vacuum cleaner that is supported on one side of the fixed shaft. The method of claim 5, wherein The rotary shaft is formed integrally with the pressing member. A cleaner body in which a mounting portion is formed; A drive motor provided to the cleaner body; A dust collecting device detachably provided to the mounting portion; And A pressing member rotatably provided in the dust collector to reduce the volume of stored dust, In the cleaner body, A gear for transmitting a driving force of the driving motor to the pressing member; And an encoder connected to the gear and configured to sense a rotation amount of the pressing member. The method of claim 7, wherein In the dust collector, Rotation axis which is the rotation center of the pressing member is included, And the rotary shaft is connected to one groove of the gear while the dust collector is mounted on the mounting portion. The method of claim 8, And an encoder shaft for allowing the encoder to be connected to the other groove of the gear. The method of claim 7, wherein In the dust collector, A dust collecting body in which a dust storage unit is formed, And a lower cover provided below the dust collecting body and selectively opened.

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