KR20150059655A - Automatic opening and shutting system of door - Google Patents

Abstract

The present invention relates to an automatic opening and shutting system of doors, which is capable of opening and shutting a plurality of doors at the same time and includes a door frame; and the doors having a preset opening location and a preset shutting location, and installed to be movable in the door frame. The present invention comprises: a driving portion having a plurality of driving gears with different diameters, having a driving motor axially coupled to the driving gears and providing a driving force, and installed in the door frame; a driven portion having a plurality of driven gears, and having a rotary shaft supporting the driven gears to make the driven gears respectively and freely rotated, and installed in the door frame with a preset interval from the driving portion; a plurality of connecting chains for respectively connecting either one of the driving gears with either one of the driven gears, and respectively running with different speeds in proportion to a diameter difference between the driving gears when the driving motor operates; and a plurality of coupling brackets for respectively coupling either one of the connecting chains to either one of the doors, and enabling to move the doors with different speeds in proportion to a running speed difference between the connecting chains in a space between the opening location and the shutting location when the driving motor operates. Accordingly, by directly delivering the driving force of the driving motor to each door, the present invention enables to reduce manufacturing costs, installation time, and a breakdown occurrence rate by simplifying a structure of the automatic opening and shutting system of doors.

Description

[0001] Automatic opening and shutting system of door [0002]

The present invention relates to a door automatic opening and closing system capable of automatically opening and closing a plurality of doors.

A conventional door automatic opening and closing system generally includes a door frame, a first door, a second door, a driving portion, a follower portion, a connecting chain, a fastening member, a first pulley, a second pulley, Wires, and the like.

The first door and the second door each have a predetermined open position and a closed position, and are movably installed in the door frame. The driving unit has a driving motor capable of providing a driving force and a driving gear axially coupled to the driving motor, and is installed in the door frame. The follower has a rotating shaft and a driven gear rotatably mounted on the rotating shaft, and is installed in the door frame at a predetermined interval from the driving unit. The connecting chain connects the drive gear and the driven gear to each other, and is fastened to the first door by the fastening member.

The first pulley is rotatably installed on one side of the second door, and the second pulley is rotatably installed on the other side of the second door at a predetermined interval from the first pulley. The wire fixing plate is fixed to the front surface of the door frame so as not to interfere with movement of the first door and the second door. The first wire is caught by the first pulley, one end is fixed to the fastening member, and the other end is fixed to the wire fixing plate. The second wire is caught by the second pulley, one end is fixed to the fastening member, and the other end is fixed to the wire fixing plate. That is, the first wire and the second wire are engaged with the first pulley and the second pulley, respectively, to form a closed loop.

When the driving motor is driven, the connecting chain connected to the driving gear travels, and the first door drive-connected to the connecting chain by the fastening member also moves along the door frame. Also, the second door connected to the first fastening member by the first wire and the second wire moves along the door frame. More specifically, the second door can move according to the direction of movement of the first door by the tension applied by the first wire to the first pulley or by the tension applied by the second wire to the second pulley, 2 pulley also moves with the second door. That is, the first pulley and the second pulley function as a kind of mobile pulley, whereby the second door can move only half the distance traveled by the first door. By using this, the door can be automatically opened and closed by moving the second door by half compared with the first door.

Such a conventional automatic door opening / closing system has a problem in that the driving force of the driving motor can not be directly transmitted to the second door, but indirectly transmitted through the first door. In addition, in the conventional door automatic opening and closing system, a separate space for installing the wire fixing plate on the front surface of the door frame must be provided, so that the volume occupied by the system is inevitably increased.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a door automatic opening / closing system having a simplified structure.

Further, it is an object of the present invention to provide a door automatic opening / closing system with an improved structure to reduce the volume occupied by the system.

According to another aspect of the present invention, there is provided a door automatic opening / closing system including a door frame, a plurality of doors having a predetermined opening position and a closing position and movably installed in the door frame, A door automatic opening / closing system capable of simultaneously opening and closing a plurality of doors, comprising: a plurality of driving gears having diameters different from each other; and a driving motor that is axially coupled to the plurality of driving gears to provide a driving force, , A plurality of driven gears, and a driven portion provided on the door frame at a predetermined distance from the drive portion, and a plurality of drive gears, each of which has a rotation axis for supporting the driven gears so as to freely rotate freely, And a driven gear of the drive gear, and when driven by the drive motor, A plurality of connecting chains each capable of traveling at different speeds and one of a plurality of doors and a plurality of doors, respectively, and when the driving motor is driven, a plurality of doors are opened and closed And a plurality of fastening brackets that can move at a speed different from each other in proportion to a difference in traveling speed between a plurality of connecting chains.

Preferably, the plurality of connecting chains each have a rack gear formed along the inner peripheral surface so as to be engageable with the driving gear and the driven gear.

Preferably, the follower portion further includes a plurality of bearings provided between the plurality of driven gears and the rotary shaft, respectively.

Preferably, the door frame further includes a plurality of guide rails formed parallel to the moving direction of the plurality of doors, and each of the plurality of fastening brackets has a guide roller capable of moving along any one of the plurality of rails .

Preferably, the plurality of drive gears are stacked in multiple stages to form an integral body.

Preferably, the door further includes a receiving portion provided in the door frame and capable of receiving a plurality of doors when the plurality of doors are disposed in the open position.

The automatic door opening / closing system according to the present invention has the following effects.

First, the driving force of the driving motor is directly transmitted to each door, thereby simplifying the structure of the door automatic opening and closing system, thereby reducing manufacturing cost, installation time, and occurrence of failure.

Second, since the volume of the automatic door opening / closing system can be reduced, the interior space of the building to which the automatic door opening / closing system is applied can be secured widely.

1 is a schematic view for explaining a door automatic opening and closing system according to a preferred embodiment of the present invention.
Fig. 2 is a view showing a state in which the first door and the second door of Fig. 1 are disposed at the open position; Fig.
3 is a perspective view of a driving unit for explaining the driving unit of FIG.
FIG. 4 is a perspective view of a first drive gear and a second drive gear of the drive unit of FIG. 3;
Fig. 5 is a perspective view of a follower for explaining the follower of Fig. 1; Fig.
6 is a partial enlarged view of the system for explaining the first fastening bracket of FIG. 1;
FIG. 7 is a partially enlarged view of the system for explaining the second fastening bracket of FIG. 1; FIG.
8A to 8C are flowcharts for explaining an automatic door using the automatic door opening / closing system of FIG.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

In the drawings, the size of each element or a specific part constituting the element is exaggerated, omitted or schematically shown for convenience and clarity of description. Therefore, the size of each component does not entirely reflect the actual size. In the following description, it is to be understood that the detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

A door automatic opening / closing system according to a preferred embodiment of the present invention is characterized in that a plurality of doors can be simultaneously opened and closed. For convenience of explanation, the automatic door opening / closing system according to the present invention will be described by taking as an example the case where two doors are simultaneously opened and closed. It should be noted, however, that the automatic door opening / closing system according to the present invention can be applied even when three doors are provided.

FIG. 1 is a schematic view for explaining a door automatic opening and closing system according to a preferred embodiment of the present invention. FIG. 2 is a view showing a state in which the first door and the second door of FIG. 1 are disposed in an open position.

3 is a perspective view of a driving unit for explaining the driving unit of FIG. 1, FIG. 4 is a perspective view of a first driving gear and a second driving gear of the driving unit of FIG. 3, FIG. 6 is a partial enlarged view of a system for explaining the first fastening bracket and the first guide bracket of FIG. 1, and FIG. 7 is a partially enlarged view of the second fastening bracket and the second guide bracket of FIG. Fig. 2 is a partial enlarged view of the system for explaining the present invention.

1 to 7, a door automatic opening and closing system 1 according to a preferred embodiment of the present invention includes a door frame 10, first and second doors 20 and 30, a receiving portion 40, The first and second connecting chains 70 and 80, the first and second fastening brackets 90 and 100, the first and second guide brackets 110 and 120, the driving unit 50, the follower unit 60, First and second guide rails 130 and 140, a controller 150, and the like.

1, the door frame 10 forms the skeleton of the door automatic opening and closing system 1 according to the present invention and includes a first movable rail (not shown) and a second movable rail (not shown) Lt; / RTI > The installation position of the door frame 10 is not particularly limited, and may be installed, for example, in an open area of the building wall.

The first moving rail and the second moving rail are formed in two rows along the bottom surface of the door frame 10 and the first door 20 and the second door 30 to be described later can be movably installed . The first moving rail and the second moving rail have the same shape as the moving rail of the door provided in the general door frame 10, so a detailed description thereof will be omitted.

The first door 20 and the second door 30 are movably installed in the door frame 10 and have predetermined open positions and closed positions.

The first door 20 and the second door 30 may be movably mounted on the first moving rail and the second moving rail of the door frame 10, respectively. As shown in FIGS. 1 and 2, the first door 20 and the second door 30 have a predetermined closed position for closing the door and a predetermined opening position for opening the door, 1 movable rail and the second movable rail, and can be disposed at any position between the closed position and the open position.

The receiving portion 40 is installed in the door frame 10 and houses the first door 20 and the second door 30 when the first door 20 and the second door 30 are disposed at the open positions. An entrance port 42, and an accommodation space 44, and the like.

2, the accommodating portion 40 is provided at one side of the door frame 10 in correspondence with the open position of the first door 20 and the second door 30. As shown in Fig. The door 42 is formed at one side of the receiving portion 40 so that the first door 20 and the second door 30 can be inserted or withdrawn and the receiving space 44 is accommodated in the receiving portion 40 So that the first door 20 and the second door 30, which are inserted through the doorway 42, can be received.

The driving unit 50 is installed in the door frame 10 and may include a first driving gear 52, a second driving gear 54, a driving motor 56, and the like. As shown in FIG. 1, the driving unit 50 is preferably installed at a right side of the upper portion of the door frame 10, but is not limited thereto, so that the driving unit 50 is located outside the closed position of the first door 20.

As shown in Fig. 3, the first drive gear 52 and the second drive gear 54 have diameters different from each other. The first driving gear 52 preferably has a diameter twice that of the second driving gear 54, but is not limited thereto. For convenience of explanation, the present invention will be described by taking as an example a case where the first drive gear 52 has a diameter twice as large as that of the second drive gear 54. The first connecting chain 70 may be fastened to the first driving gear 52 and the second connecting chain 80 may be fastened to the second driving gear 54. [ Therefore, when the drive motor 56 is driven, the first drive gear 52 travels the first link chain 70, and the second drive gear 54 travels the second link chain 80 .

As shown in FIG. 4, the first drive gear 52 and the second drive gear 54 may be stacked in multiple stages to form an integral body. That is, the first driving gear 52 and the second driving gear 54 are stacked vertically so as to form a single multi-gear. However, the present invention is not limited thereto, and the first driving gear 52 and the second driving gear 54 may be separated from each other. For convenience of explanation, the present invention will be described by taking the case where the first drive gear 52 and the second drive gear 54 are integrally formed as an example.

The drive motor 56 may be axially coupled to the first drive gear 52 and the second drive gear 54 to provide a driving force. The first drive gear 52 and the second drive gear 54 are connected to the drive motor 56 when the drive motor 56 is driven, ) At the same angular velocity.

The follower portion 60 is installed in the door frame 10 at a predetermined interval from the drive portion 50 and includes a first driven gear 62, a second driven gear 64, a rotating shaft 66, a first bearing, And a second bearing or the like. 1, the follower 60 may be installed in the left area of the upper portion of the door frame 10 so as to be located outside the first door 20 and the open position of the second door 30 , But is not limited thereto.

5, the first driven gear 62 and the second driven gear 64 have the same diameter and the rotating shaft 66 is connected to the first driven gear 62 and the second driven gear 64, Each of which can be freely rotatably supported. That is, the first driven gear 62 and the second driven gear 64 can freely rotate about the rotational shaft 66 independently of each other. The first driven gear 62 may be fastened to the first connecting chain 70 and the second driven gear 64 may be fastened to the second connecting chain 80. Accordingly, when the driving motor 56 is driven, the first connecting chain 70 freely rotates the first driven gear 62 and the second connecting chain 80 freely rotates the second driven gear 64 .

The first bearing is provided between the first driven gear 62 and the rotating shaft 66 and supports the first driven gear 62 so that the first driven gear 62 can freely rotate. Correspondingly, the second bearing is provided between the second driven gear 64 and the rotary shaft 66, and supports the second driven gear 64 so that the second driven gear 64 can freely rotate.

The first connecting chain 70 connects the first driving gear 52 and the first driven gear 62 and the second connecting chain 80 connects the second driving gear 54 and the second driven gear 64. [ Lt; / RTI >

1, the first linking chain 70 is coupled to the first drive gear 52 and the first driven gear 62 so as to be coupled to the first drive gear 52 and the first driven gear 62, . 3 and 4, the first link chain 70 may be formed with a rack gear 72 along the inner circumferential surface so as to engage with the first drive gear 52 and the first driven gear 62 have.

1, the second link chain 80 is fastened to the second drive gear 54 and the second driven gear 64, respectively, so that the second drive gear 54 and the second driven gear 64 Can be connected. 3 and 4, the second link chain 80 may be formed with a rack gear 82 along the inner circumferential surface so as to engage with the second drive gear 54 and the second driven gear 64 have.

The first drive gear 52 and the second drive gear 54 are configured so that the first drive gear 52 and the second drive gear 54 rotate at the same angular speed when the drive motor 56 is driven, And the first drive gear 52 has a diameter twice as large as that of the second drive gear 54. Therefore, when the driving motor 56 is driven, the first connecting chain 70 fastened to the first driving gear 52 is twice as much as the second connecting chain 80 fastened to the second driving gear 54 You can drive at speed.

The first fastening bracket 90 may include a bracket body 92, a fastening member 94, a guide roller 96, and the like, which fasten the first connection chain 70 and the first door 20. The second fastening bracket 100 may include a bracket body 102, a fastening member 104, a guide roller 106, and the like, which fasten the second connection chain 80 and the second door 30.

6, the bracket body 92 is fixed to one side of the upper surface of the first door 20, and the fastening member 94 is fixed to one side of the bracket body 92, (70). When the drive force of the drive motor 56 is transmitted to the first door 20 by the first fastening bracket 90 and the drive motor 56 is driven, the first door 20 is connected to the first connection chain 70 ) Between the open position and the closed position. The mounting position of the bracket main body 92 and the fastening member 94 is not particularly limited and should be set so as not to cause collision with the first driving gear 52 and the first driven gear 62.

The guide roller 96 is rotatably mounted on the bracket body 92 and is mounted on the first guide rail 130 provided on the door frame 10 and can move along the first guide rail 130. The guide roller 96 guides the movement of the first door 20 and prevents the first door 20 from being detached from the door frame 10. [

7, the bracket body 102 is fixed to one side of the upper surface of the second door 30, and the fastening member 104 is fixed to one side of the bracket body 102, (80). The driving force of the driving motor 56 is transmitted to the second door 30 by the second fastening bracket 100 and the second door 30 is rotated by the second connecting chain 80 ) Between the open position and the closed position. The second connecting chain 80 can move at the same speed as the first connecting chain 70 and at the same speed as the first connecting chain 70 when the driving motor 56 is driven, When the driving motor 56 is driven, the first door 20 can be moved at the same speed as the first door 20 while being moved at the same speed as the first door 20. The mounting position of the bracket main body 102 and the fastening member 104 is not particularly limited and should be set so as not to impose a shock with the second drive gear 54 and the second driven gear 64.

The guide roller 106 is rotatably installed on the bracket body 102 and is mounted on the second guide rail 140 installed on the door frame 10 and can move along the second guide rail 140. Therefore, the guide roller 106 guides the movement of the second door 30, and can prevent the second door 30 from being detached from the door frame 10.

The first guide bracket 110 guides the movement of the first door 20 and may have a bracket body 112, a guide roller 114, and the like. The second guide bracket 120 guides the movement of the second door 30 and may have a bracket body 122, a guide roller 124, and the like.

As shown in FIG. 6, the bracket body 112 is fixed to the other side of the upper surface of the first door 20. The guide roller 114 is rotatably installed on the bracket body 112 and is mounted on the first guide rail 130 and can move along the first guide rail 130. Therefore, the guide roller 114 guides the movement of the first door 20, and can prevent the first door 20 from being detached from the door frame 10.

The first guide bracket 110 has the same configuration as the first fastening bracket 90 except that the first guide bracket 110 is not provided with the fastening member 94. [ Accordingly, the first guide bracket 110 may not be provided or the first guide bracket 90 may be provided instead of the first guide bracket 110.

As shown in FIG. 7, the bracket body 122 is fixed to the other side of the upper surface of the second door 30. The guide roller 124 is rotatably installed on the bracket body 122 and is mounted on the second guide rail 140 and can move along the second guide rail 140. The guide roller 124 guides the movement of the second door 30 and prevents the second door 30 from being detached from the door frame 10. [

The second guide bracket 120 has the same configuration as the second fastening bracket 100 except that the second guide bracket 120 is not provided with the fastening member 104. [ Accordingly, the second guide bracket 120 may not be provided, or the second guide bracket 120 may be provided instead of the second guide bracket 120.

The first guide rail 130 is formed on the door frame 10 so as to be parallel to the moving direction of the first door 20 and the guide roller 96 of the first fastening bracket 90 and the first guide bracket 110, The guide roller 114 of the first embodiment can be seated.

The first guide rail 130 is not limited in its installation position. For example, as shown in FIG. 1, the first guide rail 130 may be provided on the upper portion of the door frame 10, . The guide roller 96 of the first fastening bracket 90 and the guide roller 114 of the first guide bracket 110 can be movably mounted on the first guide rail 130. The guide rollers 96 of the first fastening bracket 90 and the guide rollers 114 of the first guide bracket 110 move along the first guide rails 130 to move the first door 20 .

The second guide rail 140 is formed on the door frame 10 so as to be parallel to the moving direction of the second door 30. The guide rail 106 and the second guide bracket 120 of the second fastening bracket 100, The guide rollers 124 of the guide rails 124 can be seated.

1, the second guide rail 140 is installed at a position higher than the first guide rail 130, for example, in a moving direction of the second door 30 As shown in FIG. The guide roller 106 of the second fastening bracket 100 and the guide roller 124 of the second guide bracket 120 can be movably mounted on the second guide rail 140. Therefore, the guide roller 106 of the second fastening bracket 100 and the guide roller 124 of the second guide bracket 120 move along the second guide rail 140 while moving the second door 30 .

The control unit 150 is installed on one side of the door frame 10 and can control the overall operation of the door automatic opening and closing system 1 according to the present invention. More specifically, the control unit 150 controls the ON / OFF of the drive motor 56, the driving direction, the driving speed, and the like so that the first door 20 and the second door 30 are rotated As shown in Fig.

In the conventional automatic door opening / closing system, the first door is connected to the driving motor to directly receive the driving force of the driving motor, while the second door is connected to the first door through a wire to connect the driving force of the driving motor to the first door And indirectly through. Therefore, in the conventional door automatic opening and closing system, the structure of the system is complicated due to the wire connection structure between the first door and the second door, and the volume of the system is inevitably increased.

The door automatic opening and closing system 1 according to the preferred embodiment of the present invention includes a first driving gear 52 and a second driving gear 54 having different diameters from each other and integrally formed with the driving motor 56 The first drive gear 52 is driven and connected to the first door 20 and the second drive gear 54 is driven and connected to the second door 30 to drive the drive motor 56 The driving force can be directly transmitted to the first door 20 and the second door 30, respectively. Therefore, it is not necessary to separately provide a structure for transmitting the driving force between the first door 20 and the second door 30. [ As a result, the structure of the automatic door opening / closing system 1 according to the present invention can be simplified, so that the manufacturing cost, the installation time, and the failure occurrence rate can be reduced. In addition, since the volume occupied by the automatic door opening / closing system 1 according to the present invention can be reduced, the interior space of the building to which the automatic door opening / closing system 1 according to the present invention is applied can be secured widely.

8A to 8C are flowcharts for explaining automatic doors implemented using the automatic door opening / closing system of FIG.

The walls of the building are generally formed with openings for human access. Therefore, as shown in FIGS. 8A to 8C, the automatic door can be implemented in the opening 2a of the building wall body 2 by using the door automatic opening and closing system 1 according to the present invention.

Hereinafter, a process of opening the automatic door using the automatic door opening / closing system 1 according to the present invention will be described.

8A, when a person is detected by a detection sensor (not shown) in a state where the first door 20 and the second door 30 are respectively disposed at the closed positions, And drives the drive motor 56 in the forward direction.

Then, as shown in Fig. 8B, the first door 20 and the second door 30 start moving simultaneously toward the open position. Particularly, since the feeding speed of the first door 20 is proportional to the diameter of the first driving gear 52 and the feeding speed of the second door 30 are respectively proportional to the diameter of the second driving gear 54, The first door 20 moves toward the open position at a speed twice as fast as the second door 30.

8C, the first door 20 and the second door 30 reach the open positions at the same time, and are received in the receiving space 44 of the receiving portion 40, respectively. As a result, the first door 20 and the second door 30 are opened and a person can pass through the opening portion 2a of the building wall body 2.

Hereinafter, a process of automatically closing an automatic door implemented using the present invention will be described.

First, as shown in FIG. 8C, when the first door 20 and the second door 30 are disposed at the open positions, a person passes completely through the opening 2a, If no person is detected, the control unit 150 drives the drive motor 56 in the reverse direction.

Then, as shown in Fig. 8B, the first door 20 and the second door 30 start moving simultaneously toward the closed position. In particular, as in the case of opening the automatic door, the first door 20 moves toward the closed position at twice the speed of the second door 30.

Therefore, as shown in Fig. 8A, the first door 20 and the second door 30 reach the closed positions at the same time, respectively. As a result, the first door 20 and the second door 30 are closed and the opening 2a of the building wall body 2 is blocked.

A general double door type automatic door installed in an opening of a building wall has a structure in which each door is opened and closed while sliding in opposite directions to each other. Therefore, the accommodating portions for accommodating the respective doors must be individually provided on both sides of the opening portion, and therefore, when the size of the opening portion is small, space is limited. On the other hand, the automatic door realized by using the automatic door opening / closing system 1 according to the present invention requires only one receiving portion 40 at one side of the opening 2a, Constraints can be minimized.

The automatic door opening and closing system 1 according to the present invention has been described, but the present invention is not limited thereto. The door opening and closing system according to the present invention can be applied to various structures such as windows.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not to be limited to the details thereof and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

1: Automatic door opening / closing system 10: Door frame
20: first door 30: second door
40: accommodating portion 42:
44: accommodation space 50:
52: first drive gear 54: second drive gear
56: drive motor 60:
62: first driven gear 64: second driven gear
66: rotating shaft 70: first connecting chain
72: Rack gear 80: Second connection chain
82: rack gear 90: first fastening bracket
92: Bracket body 94: Fastening member
96: guide roller 100: second fastening bracket
102: bracket body 104: fastening member
106: guide roller 110: first guide bracket
112: Bracket body 114: Guide roller
120: second guide bracket 122: bracket body
124: guide roller 130: first guide rail
140: second guide rail 150:

Claims (6)

A door automatic opening / closing system capable of simultaneously opening and closing the plurality of doors, the door including a plurality of doors having a predetermined opening position and a closing position and movably installed in the door frame,
A plurality of driving gears having diameters different from each other, and a driving unit provided on the door frame, the driving unit having a driving motor axially coupled to the plurality of driving gears to provide a driving force;
A driven portion having a plurality of driven gears and a rotary shaft for supporting each of the plurality of driven gears so as to freely rotate freely, the driven portion being provided on the door frame at a predetermined interval with the driving portion;
A plurality of drive gears, each of which is capable of traveling at a different speed in proportion to a diameter difference between the plurality of drive gears when the drive motor is driven, A chain of links; And
And a control unit for controlling the operation of the drive motor so that the plurality of doors are moved between the open position and the closed position when the drive motor is driven, And a plurality of fastening brackets capable of moving at a speed different from each other in proportion to the difference. The method according to claim 1,
Wherein the plurality of connection chains each comprise:
And a rack gear formed along the inner circumferential surface so as to be engaged with the driving gear and the driven gear. The method according to claim 1,
The follower includes:
Further comprising a plurality of bearings provided between the plurality of driven gears and the rotary shaft, respectively. The method according to claim 1,
Further comprising: a plurality of guide rails formed on the door frame so as to be parallel to a moving direction of the plurality of doors,
Wherein the plurality of fastening brackets each have a guide roller capable of moving along any one of the plurality of rails. The method according to claim 1,
Wherein the plurality of drive gears are stacked in multiple stages to form an integral body. The method according to claim 1,
Further comprising an accommodating portion provided in the door frame and capable of accommodating the plurality of doors when the plurality of doors are disposed in the open position.

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