JP7540356B2 - sliding door - Google Patents

Description

The present invention relates to a sliding door that collects foreign objects on a running surface.

Conventionally, a door body running device as described in Reference 1 has been known to ensure smooth opening and closing of a sliding door. This door body running device has a door roller attached to the lower end of the door body, a rotating brush that rotates in conjunction with the rotation of the door roller, and a dust collection case that can freely come into contact with the rotating brush.

As the wheel runs along the wheel running surface, the tip of the rotating brush comes into contact with the wheel running surface, thereby picking up any debris on the wheel running surface. The debris that has been picked up is shaken off the tip of the rotating brush and collected in the debris case.

Publication No. 53-41844

However, with the door body running device described in Patent Document 1, it is assumed that the dirt picked up by the rotating brush will remain on the rotating brush and will not enter the dirt collection case. Also, if dirt gets into the gaps in the rotating brush, it is necessary to manually clean or replace the rotating brush, which is very time-consuming.

The present invention was made to solve the above problems, and aims to provide a sliding door that can collect foreign objects on the roller running surface and prevent the foreign objects from remaining on the sliding door side.

In order to solve the above problems, the sliding door of the present invention is a sliding door that can run on a running surface to open and close an opening in a building, and has a sliding door body, a wheel provided at the lower end of the sliding door body, a collection section provided on the sliding door body for collecting foreign objects on the running surface, and an adsorption mechanism that applies an adsorption force to the wheel in an adsorption area that is preset as a rotation area of the wheel for adsorbing the foreign object to the wheel, and releases the adsorption force in a release area that is preset as a rotation area of the wheel for guiding the foreign object to the collection section.

This sliding door has an adsorption mechanism that applies an adsorption force to the wheel in the adsorption area and releases the adsorption force in the release area, so that the adsorption of foreign objects adsorbed in the adsorption area can be released in the release area. Therefore, the centrifugal force caused by the rotation of the wheel in the release area can separate the foreign objects from the wheel and guide them to the collection section. Therefore, the foreign objects can be collected while preventing the foreign objects from accumulating on the sliding door side on the wheel running surface.

In the sliding door, the suction mechanism preferably has a suction hole formed on the outer circumferential surface of the wheel, a suction device that draws air through the suction hole so as to impart an adhesive force to the wheel for adsorbing the foreign object, and a guide mechanism that guides the air from the suction hole to the suction device.

With this configuration, the air near the suction hole is guided by the guide mechanism and sucked into the suction device. Therefore, when the suction hole formed on the outer circumferential surface of the wheel approaches a foreign object, the foreign object can be sucked in by the suction device and adsorbed to the wheel.

In the sliding door, it is preferable that the guide mechanism has a central passage formed along the axis of the wheel, a disengaged passage extending from the central passage to the suction hole, and a blocking member that is provided so as to be displaceable relative to the disengaged passage in response to the rotation of the wheel so as to block the disengaged passage from the central passage in the release area and open the disengaged passage to the central passage in the suction area.

According to this configuration, the guide mechanism has a blocking member that is provided so as to be displaceable relative to the center-displacement passage in response to the rotation of the wheel. Therefore, when the suction hole rotates within the suction area, the central passage and the center-displacement passage are connected, so that the foreign object can be attracted to the wheel, and when the suction hole rotates within the release area, the central passage and the center-displacement passage are blocked, so that the foreign object attracted to the suction area can be released and the foreign object can be released from the wheel using centrifugal force.

The sliding door has a first surface that covers the outer peripheral surface of the wheel in the release area, and further includes a separation section that separates the foreign object from the outer peripheral surface of the wheel, and the release area preferably has an area that extends on both sides in the direction of rotation from the portion covered by the first surface.

According to this configuration, since the separating section has a first surface that covers the outer peripheral surface of the wheel, foreign objects that are too large to pass between the wheel and the first surface can be separated from the wheel by the separating section. In addition, the suction holes 26 that contribute to the adsorption of the foreign object enter the release area just before the foreign object is separated by the separating section. Therefore, the adsorption force that the wheel uses to adsorb the foreign object can be released before the foreign object is separated by the separating section. Therefore, the foreign object whose adsorption force has been released can be collided with the separating section, so that the foreign object can be smoothly separated from the wheel and reliably collected in the collection section.

In the sliding door, it is preferable that the separating portion has a guide surface that extends radially outward from the end of the first surface at an acute angle from the radially outward side of the first surface and that guides the foreign matter separated from the outer circumferential surface of the wheel to the collection portion.

With this configuration, the guide surface extends radially outward from the end of the first surface at an acute angle, so that when the wheel rotates, foreign matter attracted to the wheel can be scraped off by the angle formed by the first surface and the guide surface.

In addition, since the guide surface extends from the end of the first surface radially outward from the first surface, foreign matter scraped off by the corner can be guided radially outward from the first surface along the guide surface.

As described above, the sliding door of the present invention can provide a sliding door that can collect foreign objects on the running surface of the sliding door and prevent the foreign objects from remaining on the sliding door side.

FIG. 2 is a perspective view showing a state in which the sliding door according to the embodiment of the present invention is used. FIG. 2 is an enlarged view showing the periphery of the wheels in the sliding door shown in FIG. 1 . FIG. 3 is a cross-sectional view taken along line III-III of FIG. FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 5 is a VV cross-sectional view of the axle portion of the wheel. FIG. FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 5 .

The sliding door 1 according to an embodiment of the present invention will be described in detail below with reference to the drawings.

As shown in Figures 1 and 2, the sliding door 1 is a sliding door that moves on a running surface 5 that extends in the width direction of the opening to open and close an opening formed in a wall surface 8 of a building, and is stored in a door pocket 9 arranged along the opening of the wall surface 8 when the opening of the wall surface 8 is in its most open state.

Figure 3 is a vertical cross-sectional view of the sliding door 1. In the following, the back side of the page in Figure 3 is called one side, the front side of the page is called the other side, the right side of the page is called the front side, and the left side of the page is called the back side.

As shown in FIG. 3, the running surface 5 is formed as a V-groove rail. Specifically, the running surface 5 has an inclined portion 5a that slopes upward toward the back side, and an inclined portion 5b that slopes upward toward the front side. These inclined portions 5a and 5b are connected at their lower ends to form an acute angle.

As shown in Figures 3 and 4, the sliding door 1 comprises a sliding door main body 3, a wheel 10 provided at the lower end of the sliding door main body 3, a pair of axles 14a, 14b extending on both sides from the wheel 10 along the axis of the wheel 10, a first bearing 50 provided on the sliding door main body 3 and rotatably supporting one end of one of the axles 14a, a second bearing 55 provided on the sliding door main body 3 and rotatably supporting the other end of the other axle 14b, an adsorption mechanism 25 that provides the wheel 10 with an adsorption force for adsorbing the foreign object 7, a collection section 20 that collects the foreign object 7, and a removal section 40 that removes the foreign object 7 from the outer circumferential surface of the wheel 10. The wheels 10, shafts 14a and 14b, first bearing 50, second bearing 55, suction mechanism 25, collection unit 20, and separation unit 40 are provided on one side and the other side of the sliding door body 3, respectively, but since the sliding door body 3 has a symmetrical configuration, only the configuration on one side will be described and the configuration on the other side will be omitted.

The sliding door body 3 is a plate-like member that is rectangular in plan view and extends in the vertical direction. At the lower end of the sliding door body 3, a storage section 3a is formed for storing the wheel 10, the shaft sections 14a and 14b, the first bearing 50, the second bearing 55, the suction mechanism 25, the collection section 20, and the separation section 40.

As shown in FIGS. 3 and 4, the storage section 3a includes a front wall 3A forming the front side of the sliding door main body 3, a rear wall 3B forming the rear side of the sliding door main body 3, and a bottom wall 3D forming the bottom surface of the sliding door main body 3.
It is formed by an upper wall 3C that is provided between the front wall 3A and the rear wall 3B and faces the lower wall 3D, an other end wall 3E that forms the other end face of the sliding door main body 3, and one end wall 3F that is provided on one side of the other end wall 3E and faces the other end wall 3E.

The front wall 3A is provided with a removal section 3b (see FIG. 2) for removing the collection section 20 from the storage section 3a to the outside of the sliding door body 3, and an exhaust section 3c (see FIG. 3) for exhausting the air sucked in by the suction device 30 (described later) of the suction mechanism 25.

The removal section 3b has an opening formed in a part of the front wall 3A and a lid attached to the front wall 3A so that the opening can be opened and closed. By opening the lid of the removal section 3b, the collection section 20 can be removed to the outside of the sliding door body 3, and the foreign objects 7 collected in the collection section 20 can be disposed of.

The exhaust section 3c has an opening formed in a part of the front wall 3A and a louver formed in this opening.

As shown in FIG. 4, the lower wall 3D has a hole 3G formed therein for passing the lower part of the wheel 10 therethrough.

As shown in FIG. 3, the wheel 10 is supported rotatably with respect to the sliding door body 3 by the axle portions 14a and 14b being journalled by the first bearing 50 and the second bearing 55, respectively. As shown in FIG. 4, the wheel 10 is stored in the storage section 3a of the sliding door body 3 with a portion of the wheel 10 protruding from the lower wall 3D through the hole 3G in the lower wall 3D.

The wheel 10 engages with the V-groove of the running surface 5 so that the wheel 10 can run on the running surface 5 with the outer circumferential surface of the wheel 10 separated from the bottom of the V-groove of the running surface 5. Specifically, the wheel 10 has a second portion 10b in contact with the inclined portion 5b of the running surface 5, a third portion 10c in contact with the inclined portion 5a of the running surface 5, and a first portion 10a that axially connects the second portion 10b and the third portion 10c and is disposed on the bottom of the V-groove with the second portion 10b and the third portion 10c in contact with the inclined portion 5b and the inclined portion 5a, respectively.

As shown in FIG. 3, the first bearing 50 is fixed to the rear wall 3B of the sliding door main body 3 and rotatably supports the shaft portion 14a. Specifically, as shown in FIG. 5, the first bearing 50 has a cylindrical support portion 50a that rotatably supports the shaft portion 14a, and a main body portion 50b that holds the support portion 50a.

A ball bearing 52 is provided on the inner circumference of the support portion 50a, and the shaft portion 14a is supported via this ball bearing 52.

The main body 50b has a communication chamber 50c that communicates with the central passage 15 (described later) of the guide mechanism 28. This communication chamber 50c is sealed by the support 50a and the shaft 14a being in close contact with each other.

As shown in Fig. 3, the second bearing 55 is fixed to the front wall 3A of the sliding door main body 3 and rotatably supports the shaft portion 14b. Specifically, as shown in Fig. 5, the second bearing 55 has a cylindrical support portion 55a that rotatably supports the shaft portion 14b, a main body portion 55b that holds the support portion 55a, and a connection portion 55c that extends from the main body portion 55b to the housing 37 (described below) of the suction device 30 and is connected to this housing 37. The support portion 55a has the ball bearing 52 described above.

The second bearing 55 has a fan passage 34 that extends from the main body 57 to the connection portion 55c to connect the central passage 15 to the suction hole 37a of the housing 37. The fan passage 34 is sealed by the support portion 55a and the shaft portion 14b being in close contact with each other.

The collection section 20 is a container for collecting the foreign object 7 that has been attracted to the wheel 10 by the suction mechanism 25, and is provided on one side in the running direction of the wheel 10 (the side of one end wall 3F of the storage section 3a of the sliding door main body 3). The collection section 20 is provided on the bottom wall 3D of the sliding door main body 3 and adjacent to the removal section 3b (see FIG. 2) provided on the sliding door main body 3 so that the foreign object 7 can be removed from the removal section 3b.

As shown in FIG. 4, the collection section 20 has an opening that opens upward to receive the foreign object 7 released from the wheel 10. In addition, the opening of the collection section 20 is located below the upper end position of the wheel 10.

The suction mechanism 25 exerts an adsorption force on the wheel 10 in an adsorption region that is preset as a rotation region of the wheel 10 for adsorbing the foreign object 7 to the wheel 10, and releases the adsorption force on the wheel 10 in a release region that is preset as a rotation region of the wheel for guiding the foreign object 7 to the collection unit 20. Specifically, as shown in Figures 3 and 4, the suction mechanism 25 has suction holes 26 formed on the outer peripheral surface of the wheel 10, a suction device 30 that sucks air from the suction holes 26 so as to adsorb the foreign object 7 to the suction holes 26, and a guide mechanism 28 (see Figure 4) that guides the air from the suction holes 26 to the suction device 30.

Twelve suction holes 26 are provided at equal intervals along the outer circumferential surface of the wheel 10. Each suction hole 26 sucks in air from outside the wheel 10 in response to the operation of the suction device 30 so as to provide the wheel 10 with an adhesive force for adsorbing foreign matter 7 to the outer circumferential surface of the wheel 10. In addition, a filter is provided on the outer circumferential surface of the wheel 10 to cover the suction holes 26 in order to prevent foreign matter 7 from entering the inside of the suction holes 26.

As shown in Figures 3 and 4, the suction device 30 has a fan 36 provided adjacent to the exhaust section 3c of the sliding door main body 3, a housing 37 that houses the fan 36, and a power source 38 for driving the fan 36. The housing 37 is attached to the front wall 3A of the sliding door main body 3 so as to define a fan storage section between itself and the front wall 3A, and supports the fan 36 rotatably between itself and the front wall 3A. The fan 36 rotates around an axis extending in the front-rear direction of the sliding door main body 3. The housing 37 also has a suction hole 37a formed therein for sucking in air from within the storage section in response to the operation of the fan 36.

The power source 38 rotates the fan 36 by energizing the motor attached to the fan 36. A battery, a dynamo, or the like is used as the power source 38. When a battery is used as the power source 38, the motor may be energized at all times, but it is preferable to energize the fan 36 only when the wheel 10 is rotating. As a configuration for this purpose, for example, a motion activation switch may be installed on the power source 38.

As shown in FIG. 5, the guide mechanism 28 has a central passage 15 that is connected to the fan passage 34 and is formed inside the axle portions 14a, 14b of the wheel 10 along the axle portions 14a, 14b, a plurality of (12 in this embodiment) off-center passages 12 that extend from the axle portions 14a, 14b to the suction holes 26, and a blocking member 60 that blocks the central passage 15 and the off-center passage 12 in the release region and connects the central passage 15 and the off-center passage 12 in the suction region.

As shown in FIG. 5, the central passage 15 is formed from the rear end of the shaft portion 14a to the front end of the shaft portion 14b, and is connected to the fan passage 34 in the front direction of the sliding door body 3.

The blocking member 60 is provided so as to be displaceable relative to the off-center passage 12 in response to the rotation of the wheel 10 so as to block the off-center passage 12 from the central passage 15 in the release region and open the off-center passage 12 to the central passage 15 in the suction region.

Specifically, as shown in FIG. 5, the blocking member 60 has a base end 62 fixed to the first bearing 50 within the communication chamber 15c, and a blocking portion 64 extending from the base end 62 toward the front side of the sliding door body 3 to block the off-center passage 12 within the central passage 15. The blocking portion 64 has a shape that allows it to come into close contact with the inner surface of the central passage 15. In addition, the blocking portion 64 is positioned at a position that overlaps with the opening of the off-center passage 12 in response to the rotation of the wheel 10, thereby closing the opening. This blocks the off-center passage 12 from the central passage 15, and the adhesive force of the wheel 10 is released.

In FIG. 6, α and β are angles that are appropriately set to define the release area, and for example, the angle α is set in the range of 10 to 20 degrees, and the angle β is set in the range of 45 to 60 degrees. The blocking section 64 has a width that allows it to contact the inner surface of the central passage 15 over a range of a predetermined angle α to α+β (release area) clockwise in FIG. 6 (the rotation direction of the wheel 10 when the sliding door main body 3 moves to one side) from the apex on an imaginary circle centered on the axis of the wheel 10 in order to release the foreign object 7 from the outer surface of the wheel 10 to the side where the collection section 20 is installed. Note that the suction area is the area of the rotation area of the wheel 10 other than the release area.

As shown in FIG. 4, the separating section 40 has a first surface 42 provided on one side of the wheel 10 and facing the outer peripheral surface of the wheel 10, a second surface 44 extending from the other end of the first surface 42 toward the radially outer side of the first surface 42 on the radially outer side of the first surface 42, and a third surface 46 extending from the one end of the first surface 42 toward the radially outer side of the first surface 42 on the radially outer side of the first surface 42. The second surface 44 and the third surface 46 correspond to guide surfaces that extend radially outward from the end of the first surface 42 at an acute angle on the radially outer side of the first surface 42 and guide the foreign matter 7 separated from the outer peripheral surface of the wheel 10 to the collection section 20.

The first surface 42 is intended to form a gap between the outer peripheral surface of the wheel 10 and the first surface 42, which prevents the intrusion of foreign matter 7. Specifically, the first surface 42 is provided in a position that covers the outer peripheral surface of the wheel 10 from the radial outside while being slightly spaced from the outer peripheral surface of the wheel 10.

The second surface 44 is for scraping off foreign matter 7 attracted to the outer peripheral surface of the wheel 10 when the wheel 10 is rotating clockwise. Specifically, the second surface 44 extends radially outward from the other end of the first surface 42 so that the angle between the second surface 44 and the first surface 42 is an acute angle. The second surface 44 also faces upward and is provided so as to overlap the collection section 20 when viewed from above. Furthermore, the second surface 44 has a shape that curves toward the opening of the collection section 20 as shown in FIG. 4. Therefore, the scraped off foreign matter 7 is guided to the collection section 20 along this curved surface.

The third surface 46 is for scraping off the foreign matter 7 when the wheel 10 is rotating counterclockwise. Specifically, the third surface 46 extends radially outward from one end of the first surface 42 so that the angle it forms with the first surface 42 is an acute angle. The third surface 46 also faces the opposite side (lower side) to the second surface 44, and is provided so as to overlap the collection section 20. Furthermore, the third surface 46 has a curved shape that draws an upward convex curve. Therefore, the scraped off foreign matter 7 collides with the curved surface and is guided along this curved surface to the collection section 20.

In this embodiment, as shown in FIG. 6, the separating section 40 is positioned relative to the release area in order to separate the foreign object 7 from the suction hole 26 in both directions immediately before the foreign object 7 is guided to the separating section 40. Specifically, as shown in FIG. 6, the release area has an area extending from the area covered by the first surface 42 to both sides in the rotational direction of the wheel 10. When the foreign object 7, while being adsorbed to the outer peripheral surface of the wheel 10, approaches the areas extending to both sides, it separates from the outer peripheral surface of the wheel 10 and is scraped off by the separating section 40.

(Action and Effect)
The sliding door 1 according to this embodiment has an adsorption mechanism 25 that applies an adsorption force to the wheel 10 in the adsorption region and releases the adsorption force in the release region, so that the adsorption of the foreign object 7 adsorbed in the adsorption region can be released in the release region. Therefore, the foreign object 7 can be separated from the wheel 10 by centrifugal force accompanying the rotation of the wheel 10 in the release region and guided to the collection section 20. Therefore, the foreign object 7 can be collected while preventing the foreign object 7 on the running surface 5 from accumulating on the sliding door 1 side.

The suction mechanism 25 also has suction holes 26 formed on the outer peripheral surface of the wheel 10, a suction device 30 that sucks air from the suction holes 26 to impart an adhesive force for adsorbing the foreign object 7 to the wheel 10, and a guide mechanism 28 that guides the air from the suction holes 26 to the suction device 30. Thus, the air near the suction holes 26 is guided by the guide mechanism 28 and sucked into the suction device 30. Therefore, when the suction holes 26 formed on the outer peripheral surface of the wheel 10 approach the foreign object 7, the foreign object 7 can be sucked in by the suction device 30 and adsorbed to the wheel 10.

The guide mechanism 28 also has a blocking member 60 that is provided so as to be displaceable relative to the center-displacement passage in response to the rotation of the wheel 10. Therefore, when the suction hole 26 is rotating in the suction region, the central passage 15 and the center-displacement passage 12 are connected, so that the foreign object 7 can be attracted to the wheel 10. When the suction hole 26 is rotating in the release region, the central passage 15 and the center-displacement passage 12 are blocked, so that the suction of the foreign object 7 attracted in the suction region is released, and the foreign object 7 can be separated from the wheel 10 by centrifugal force.

In addition, the second surface 44 extends radially outward from the other end of the first surface 42 at an acute angle, so that when the wheel 10 rotates so that the sliding door 1 moves to one side, the foreign object 7 attracted to the wheel 10 can be scraped off by the angle formed by the first surface 42 and the second surface 44.

In addition, since the second surface 44 extends from the other end of the first surface 42 radially outward from the first surface 42, the foreign matter 7 scraped off by the corner can be placed on the second surface 44 and guided radially outward from the first surface 42.

In addition, since the second surface 44 overlaps with the collection section 20 when viewed from above, the foreign matter 7 placed on the second surface 44 can be smoothly guided along this second surface 44 to the collection section 20.

The separating section 40 further has a third surface 46 that extends radially outward from one end of the first surface 42 at an acute angle from the first surface 42 and overlaps with the collection section 20 when viewed from above. Since the third surface 46 extends radially outward from the first surface 42 at an acute angle from the one end of the first surface 42, when the wheel 10 rotates so that the sliding door 1 moves to the other side, the foreign matter 7 attracted to the wheel 10 can be scraped off by the angle formed by the first surface 42 and the third surface 46.

In addition, since the third surface 46 extends radially outward from the first surface 42, the foreign matter 7 scraped off by the corner can be guided radially outward from the first surface 42 along the third surface 46 by colliding with the third surface 46 using centrifugal force.

In addition, since the third surface 46 overlaps with the collection section 20 when viewed from above, the foreign matter 7 guided along the third surface 46 as described above can be smoothly guided to the collection section 20.

The first surface 42 covers the outer peripheral surface of the wheel 10 in the release area, and the release area has an area extending from the portion covered by the first surface 42 to both sides in the direction of rotation. With this configuration, the suction holes 26 that contribute to the adsorption of the foreign object 7 reach the release area just before the foreign object 7 reaches the separation section 40. Therefore, the adsorption force of the wheel 10 to adsorb the foreign object 7 can be released before the foreign object 7 reaches the separation section 40. Therefore, the foreign object 7 can be smoothly scraped off into the separation section 40 by centrifugal force, and can be reliably collected in the collection section 20.

(Modification)
The above-described embodiments are merely examples of preferred embodiments of the present invention, and the present invention is not limited to the above-described embodiments.

In the above embodiment, a V-groove rail was used as the running surface 5, but the running surface 5 is not limited to a V-groove rail and may be, for example, flat.

In the above embodiment, the collection section 20 is provided on one side of the wheel 10 (the side of one end wall 3F of the storage section 3a of the sliding door main body 3), but the location of the collection section 20 is not limited to this and may be on the other side of the wheel 10 (the other end wall 3E of the storage section 3a of the sliding door main body 3). In this case, a release area may be provided on the other side of the wheel 10 to release the foreign object 7 in the other direction of the wheel 10. In other words, the blocking section 64 may have a width that can contact the inner surface of the central passage 15 over a range of a predetermined angle α to α + β in the counterclockwise direction in Figure 6 (the rotation direction of the wheel 10 when the sliding door main body 3 moves to the other side) from the apex on a virtual circle centered on the axis of the wheel 10.

Moreover, multiple recovery sections 20 (for example, one on each side of the wheel 10) may be provided. In this case, the release area may be provided on both sides of the wheel 10. In other words, two blocking sections 64 may be provided, and these blocking sections 64, 64 may have a width that allows them to contact the inner circumferential surface of the central passage 15 over a range of a predetermined angle α to α + β clockwise and counterclockwise in FIG. 6 from the apex on an imaginary circle centered on the axis of the wheel 10.

In the above embodiment, the suction holes 26 are provided at 12 locations at equal intervals along the outer circumferential surface of the wheel 10, but the number of suction holes 26 is not limited to 12 and may be increased or decreased as appropriate. The same applies to the centering passage 12.

In the above embodiment, the suction device 30 includes a fan 36, but the components of the suction device 30 that can be used are not limited to the fan 36. For example, an aspirator that reduces the pressure inside the fan passage 34 by the Venturi effect may be used instead of the fan 36.

Needless to say, various design modifications are possible within the scope of the present invention.

Reference Signs List 1: Sliding door 5: Running surface 7: Foreign object 10: Wheel 12: Off-center passage 14: Shaft portion 15: Central passage 20: Collection portion 25: Suction mechanism 26: Suction hole 30: Suction device 40: Separation portion 42: First surface 44: Second surface (guiding surface)
46 Third surface (guiding surface)
60 Blocking member

Claims (5)

A sliding door that can run on a running surface to open and close an opening in a building,
A sliding door body,
A wheel provided at a lower end of the sliding door body;
A collection section provided on the sliding door body for collecting foreign objects on the running surface;
a suction mechanism that applies an adhesive force to the wheel in an adhesive region that is preset as a rotation region of the wheel for adsorbing the foreign object to the wheel, and releases the adhesive force in a release region that is preset as a rotation region of the wheel for directing the foreign object to the collection section. The sliding door according to claim 1,
The suction mechanism is a sliding door having a suction hole formed on the outer peripheral surface of the wheel, a suction device that sucks air through the suction hole so as to impart an adhesive force to the wheel for adsorbing the foreign object, and a guide mechanism that guides the air from the suction hole to the suction device. The sliding door according to claim 2,
The guide mechanism is a sliding door having a central passage formed along the axis of the wheel, a decentered passage extending from the central passage to the suction hole, and a blocking member provided to be displaceable relatively to the decentered passage in response to rotation of the wheel so as to block the decentered passage from the central passage in the release region and to open the decentered passage to the central passage in the suction region. The sliding door according to any one of claims 1 to 3,
The wheel release device further includes a separating portion that has a first surface that covers the outer peripheral surface of the wheel in the release region and separates the foreign object from the outer peripheral surface of the wheel,
A sliding door, wherein the release region has a region extending on both sides in a rotation direction from a portion covered by the first surface. The sliding door according to claim 4,
The separation portion extends radially outward from the first surface at an acute angle from the end of the first surface, and has a guide surface that guides the foreign matter separated from the outer peripheral surface of the wheel to the collection portion.