JP2005238926A - Platform door - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a platform door capable of safely and smoothly allowing passengers to get on/get off by matching boarding-alighting ports of a rolling stock of different door positions with an open part of the platform door. <P>SOLUTION: A platform door 1 is provided on a platform 1. The door 1 is supported by a supporting device having a driving device 27 and a supporting device 5. The supporting device 5 has a door body 13 to cover the supporting device 5. The door body 13 is advanced/retracted in the entering direction of a rolling stock by the drive of the driving device 27, and the door body 13 is opened corresponding to the boarding-alighting ports of the rolling stock entering a platform 80. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a movable fence that is installed on a platform of a track vehicle such as a railroad to prevent a passenger from falling onto a track or a passenger and a train from being contacted, and also to facilitate passenger supervision on the platform.

2. Description of the Related Art Conventionally, on platforms for track vehicles, platform doors as movable fences are often installed in order to prevent passengers from falling onto railway tracks and preventing passengers from coming into contact with trains. Usually, a plurality of platform doors are arranged along the edge of the platform on the track side, and the door body slides from one opening of a door pocket fixed to the upper surface of the platform to open and close.
For example, the platform door 83 described in Japanese Patent No. 33006055 shown in FIG. 14 is provided with a pair of door pockets 82a and 82b adjacent to each other, and the pair of door pockets 82a and 82b are spaced apart from each other. A plurality are provided in the extending direction. In each door pocket 82a, 82b, it is provided so that the door bodies 81a, 81b can move forward and backward in the direction (left and right toward the paper surface), and the door bodies 81a, 81b slide to open and close. And the opening / closing part of these door bodies 81a and 81b is arrange | positioned before the door entrance / exit of a train, and opens / closes in conjunction with the entrance / exit door of a train.

  In such a platform door 83, between the pair of adjacent door pockets, an interval from the left end of the door pocket 82a to the right end of the door pocket 82b becomes an opening (entrance / exit) "W" for passengers to get on and off. According to such a platform door 83 structure, one door body 81a, 81b is provided in each door pocket 82a, 82b, and one opening is provided in each door pocket 82a, 82b. The door bodies 81a and 81b are configured to slide from one opening of the door pockets 82a and 82b. When the door bodies 81a and 81b are opened, the door bodies 81a and 81b are stored in the door pockets 82a and 82b. It has become.

  In the platform door 83, a support device and a drive device for the door bodies 81a and 81b are disposed in the door pockets 82a and 82b. For this reason, the length of the door pockets 82a and 82b becomes longer than the length of the door bodies 81a and 81b in the sliding direction. Therefore, on the platform 80, door pockets 82a and 82b having a long dimension are arranged in the lateral direction (longitudinal direction of the track). A train with a different door position and number of doors may enter the platform 80 provided with such platform doors 83 due to, for example, mutual trains or trains of different types or other companies' routes. In such a case, the positions of the entrances and exits of the trains and the opening portions “l” of the door bodies 81a and 81b of the platform door 83 do not coincide with each other, and the platform door 83 prevents passengers from getting on and off.

As another prior art, FIGS. 15 and 16 show a platform door disclosed in Japanese Patent Application Laid-Open No. 2002-308089. In this platform door, the length of the door pocket 90 is shortened to make the door relatively long.
That is, the left side door body 97 and the linear rails 93 and 94 for the right side door body 98 are provided on the inner side surface of the door pocket 90 so as to overlap each other with a space therebetween. Two slide blocks 95 movably provided along the upper and lower linear rails 93 and 94 are fitted. The slide block 95 is provided behind the left and right door bodies 97 and 98, and is fixed to a support member 100 arranged to overlap with other door bodies at intervals in the horizontal direction. A pulley 99 is rotatably fixed to the side surface of the door pocket 90, a drive motor 101 is connected to one pulley 99, and the belt 103 and the support member 100 spanned between the pair of pulleys 99 are a belt grip 105. Are bound by. According to this technique, the length (R) of the door body can be increased only in the portion where the support members 100 of the left and right door bodies 97 and 98 overlap. Conversely, when the length of the door body is the same, the length of the door pocket can be shortened.
Japanese Patent No. 3306005 (see summary and FIG. 1) JP 2002-308089 A (refer to summary and FIGS. 1 and 3)

  However, since the platform door shown in FIGS. 15 and 16 has a structure in which each support member 100 is supported by being deformed in the horizontal direction, a considerable amount of gap (Z) is required between them. There are restrictions on the length (R) of the doors 97 and 98 to be accommodated with respect to the total length (Y). That is, the length (R) of the door bodies 97 and 98 cannot exceed “(the total length of the door pocket 90 (Y) −the gap (Z)) × 0.5”. For this reason, since it is not possible to sufficiently cope with recent trains at various door positions, there is a problem similar to that of the platform door shown in FIG.

  In view of the above circumstances, the present invention provides a door body of an arbitrary length supported by a support device having a short length, and controls the opening and closing of the door bodies independently and with variable stroke, for example, An object of the present invention is to provide a movable fence that allows passengers to get on and off safely and smoothly by matching the entrances and exits of trains with different door positions and the opening portions of platform doors.

In order to solve the above-mentioned problem, the movable fence of the present invention is supported by a support device having a drive source provided on a platform into which a vehicle enters, and supported by the support device, and the vehicle is connected by driving the support device. In the movable fence provided with the door body that moves forward and backward in the direction, a door body is provided around the support device, and the door body is opened in correspondence with the entrance / exit of the vehicle.
The movable fence can be controlled by a controller to open and close each door body according to the arrangement information of the entrance / exit of the vehicle.
Another movable fence of the present invention is a movable fence provided with a door body that is supported by a support device having a drive source and moves forward and backward in one direction by driving of the support device. A body was provided, and the door was opened corresponding to the entrance of the facility.
The movable fence is provided with an indicator that can be arbitrarily changed between display and non-display along the advancing / retreating direction of the door body, and the display of the indicator is displayed corresponding to the open position of the door body. I did it.

A movable fence according to the present invention includes a support device having a drive source provided on a platform into which a vehicle enters, and a door body that is supported by the support device and moves forward and backward in the vehicle entry direction by driving the support device. In the movable fence provided, a door body is provided around the support device, and the door body is opened in correspondence with the entrance / exit of the vehicle. The degree of freedom increases. Further, the support device can be slid to the left and right, and a sufficient response can be made to changes in the entrance / exit.
The movable fence can reduce the burden on the station staff by controlling the opening / closing of each door body by a controller based on the arrangement information of the entrance / exit of the vehicle.
Another movable fence of the present invention is a movable fence provided with a door body that is supported by a support device having a drive source and moves forward and backward in one direction by driving of the support device. Since the body is provided and the door is opened corresponding to the entrance of the facility, the opening degree of the door can be adjusted according to the number of visitors.
Each movable fence is provided with an indicator that can be arbitrarily changed between display and non-display along the advancing and retreating direction of the door body, and the display on the indicator corresponds to the open position of the door body. Since it is displayed, it is possible to inform the attendees of the opening position of the door in advance.

Hereinafter, embodiments of the movable fence of the present invention will be described with reference to the drawings. In this specification, left and right refer to the longitudinal direction of the platform (vehicle entry direction), and front and rear are directions that intersect the longitudinal direction of the platform, with the platform side as the front side and the track side as the rear side. explain.
1 to 3 show a platform door 1 according to the present invention, FIG. 1 is a front view of the platform door as a movable fence according to the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG. FIG. 3 is a cross-sectional view taken along line BB in FIG.
The platform door 1 is supported by a support device 5 erected along the edge 3 of the platform 80, and the platform door 1 is installed at a plurality of locations along the track of the platform 80. In the supporting device 5, pillars 7 erected at four corners are fixed to the upper surface of the platform 80, and the uppermost ends of the pillars 7 are coupled by a frame 9.

A support guide device 11 that supports the door body 13 is provided on the upper surface of the frame 9, and the door body 13 is attached to the end edge 3 of the platform 80 so as to be movable left and right. The door body 13 has outer plates 17a and 17b fixed to the front and rear of the upper plate 15, and side plates 19 fixed to the left and right, and has a box shape without a bottom. In FIG. 1, the outer plate 17a on the front side of the paper is not shown in order to facilitate understanding of the internal configuration.
A driving device 27 is disposed below the support guide device 11 at an appropriate interval, and a guide device 28 is provided at a substantially lower end of the door body 13. The door body 13 is supported by the support device 5 via the support guide device 11 provided at the upper end, and is guided by the guide device 28 provided at the lower end portion, and is attached between the support columns 7. It is configured to be slidable in the left-right direction by the drive device 27 controlled by the above.

4 and 5 show details of the support guide device 11.
In the support guide device 11, an appropriate rail mounting member 21 is fixed to the lower surface in the longitudinal direction of the upper plate 15 of the door body 13, and a linear rail 23 having a substantially I-shaped cross section is appropriate to the longitudinal direction and lower surface of the rail mounting member 21. It is fixed by means. The linear rail 23 is disposed between the left and right side plates 19. On the other hand, on the frame 9 fixed to the upper end of the support column 7, two sets of linear guides 24 are arranged in the left-right direction while maintaining an appropriate interval in the longitudinal direction of the door body 13. Then, the substantially concave (dovetail groove) linear guide 24 is formed in a shape corresponding to the outer peripheral portion of the linear rail 23, and the linear rail 23 is inserted through the linear guide 24. With such a configuration, the support guide device 11 slides in the left-right direction while supporting and guiding the door body 13 to be placed.
Note that the cross-sectional shape of the rail mounting member 21 is not limited to the illustrated one, and the long door body 13 is not distorted more than a predetermined amount, and the positional relationship between the linear rail 23 and the door body 13. As long as it complements. When the door body has sufficient rigidity, it is also effective to omit the rail mounting member 21 and directly fix the linear rail 23 to the upper plate 15. Furthermore, the rail attachment member 21 may be attached in the left-right direction of the outer plates 17a and 17b.

Details of the driving device 27 will be described with reference to FIGS. 6 and 7.
In the figure, a rack 31 is attached to the inner surface of the door body 13 horizontally in the longitudinal direction of the outer plate 17a from one end to the other end of the outer plate 17a. On the other hand, a rectangular frame 33 fixed between the columns 7 is attached with a drive motor 34 and a speed reducer 35 connected to each other on the outer plate 17a side, and a pinion 37 is attached to the output shaft of the speed reducer 35. Is fixed. The rack 31 and the pinion 37 are engaged with each other, and the door body 13 can be slid to the left and right by the rotational drive of the drive motor 34 in the forward / reverse direction.
In addition, although the drive motor which connected the reduction gear as a drive source is illustrated, the drive motor 34 and the pinion 37 may be directly connected, and the actuator using pressure reduction or air pressure may be sufficient. Moreover, although the rack 31 is arrange | positioned at the side part of the outer plate | plate 17a, you may provide in the intermediate part of the support | pillar 7. FIG. As a drive system, in addition to a rack and pinion combination, a chain and sprocket combination, or a toothed belt and a toothed pulley may be used.

As a modified example of the driving device, FIGS. 8 and 9 show a driving device 27 of the platform door 1 using a toothed belt and a toothed pulley. The drive device 27 includes a toothed belt 51, two guide rollers 52, and a toothed pulley 53 disposed between the guide rollers 52.
The toothed belt 51 has one end fixed to the left side plate 19 by a stopper 54, and the other end meshed with a toothed pulley 53 through a guide roller 52, again through the guide roller 52, and by the stopper 54. It is fixed to the right side plate 19. The guide roller 52 is rotatably attached to a vertical plate 56 attached to a frame 55 fixed between the columns 7 via a bearing. The toothed pulley 53 is connected to an output shaft of a speed reducer 57 attached to a vertical plate 56.

  Further, the speed reducer 57 is connected to the drive motor 58, and the toothed pulley 53 rotates in the forward / reverse direction by the rotational drive of the drive motor 58 in the forward / reverse direction so that the door body 13 slides left and right. It has become. The horizontal member 59 is a reinforcing member for the door body 13, but may be omitted. As the drive source, the drive motor 58 is connected to the speed reducer 57, but may be a directly connected motor or a hydraulic or pneumatic actuator.

10 and 11 show details of the guide device 28. FIG.
The guide device 28 is disposed below the support column 7, and the guide device 28 is attached to the outer plates 17 a and 17 b at both ends in the front-rear direction of the rectangular frame 41 fixed between the support columns 7 of the support device 5. Two sets of cam followers 43 are attached to each other at an appropriate interval. The front and rear cam followers 43 are fixed to the outer plates 17a, 17b of the door body 13 by mounting bolts 42 with an appropriate minute gap, and mounting holes 44 formed in the frame 41 are provided for adjusting the gap. It has a long hole in the front-rear direction. The guide device 28 stabilizes the lower end side of the door body 13.

As described above, according to the platform door 1 according to the present invention, the support device 5 has the minimum width and length necessary for housing the support guide device 11, the drive device 27, the control device 22, and the guide device 28. Therefore, the installation area is very small and the weight can be reduced.
On the other hand, the length of the door body 13 is not limited, and an arbitrary length can be manufactured. Further, the door body 13 can be slid to the left and right over the entire width or can be moved by an arbitrary stroke. Furthermore, the door body 13 is covered with the upper plate 15, the outer plates 17a and 17b, and the side plate 19, so that the aesthetic appearance, the reliability, and the sense of security can be improved.
Thus, since the platform door 1 according to the present invention has a small installation area and is lightweight, the installation work on the platform 80 is easy and can be performed in a short time, and even when installed on the existing platform 80, Does not interfere with train operation. Moreover, it is a flexible structure and can respond easily to the train of many kinds of door positions.

Next, a door opening and closing system for opening and closing the platform door 1 will be described.
FIG. 13 shows a door opening / closing system for a platform door according to the present invention. This system mainly includes an operation command center 70, a station monitoring panel 71, and a general control board 72. These devices can transmit and receive each other or indirectly. That is, the general control board 72 can transmit and receive bidirectionally with the station monitoring panel 71 and the ground side transmitter / receiver 74, and the operation command center 70 can bidirectionally transmit and receive with the station monitoring panel 71. This operation command center 70 is provided at all stations, and grasps the organization, form, position, etc. of trains on the route. Moreover, the train side transmitter / receiver 73 is provided in the train, and bidirectional transmission / reception is possible wirelessly to the ground side transmitter / receiver 74 disposed on the platform side.
The ground side transmitter / receiver 74 is bidirectionally connected to the station monitoring board 71 via the general control board 72. The operation command center 70 transmits the train information of the next train that arrives at the specified station to the station monitoring panel 71. The train information includes the train unique number described above, and the train information of the next arrival train is displayed on the station monitoring panel 71. The train information is displayed on the general control panel 72 at the same time.

For example, the train information 76a of the train that departs from the T station adjacent to the station monitoring panel 71 of the S station and travels to the S station from the operation command center 70 of the adjacent T station on the downstream side from the S station. Sent. The general control panel 72 of the S station that has received the train information 76a transmits the collective opening / closing signal 76b to all the individual operation panels 75a to 75d (generally denoted by reference numeral 75) based on the train information 76a.
Based on the train unique number included in the train information 76a, the general control panel 72 is included in the collective opening / closing signal 76b corresponding to the plurality of door bodies 7a, 7a among the all door bodies 7a, 7b. . The individual operation panel 75 selectively receives the opening operation signal 78 of the door bodies 7a and 7b by the collective opening / closing signal 76b. Then, the indicators 53a to 53d (generally indicated as 53) corresponding to the door bodies 7a and 7b to which the opening operation signal 78 is output are turned on before the train arrives. A passenger who plans to get on the train waits in front of the doors 7a and 7b corresponding to the position of the indicator 53 that is lit.

  When the train arriving at the station stops at a predetermined position, the driver or the conductor turns on the operation switch of the train side transceiver 73. The on-state value is output from the train-side transceiver 73 as a radio signal and input to the ground-side transceiver 74. The ground side transceiver 74 outputs a door operation start signal 76c to the general control panel 72 based on the ON state value. The integrated control panel 72 outputs the collective opening / closing signal 76b corresponding to the train unique number included in the train information 76a, with the reception of the door operation start signal 76c as an AND condition.

The opening operation signal 78 is a collective signal for selecting a plurality of door bodies 7 and opening them arbitrarily according to the collective opening / closing signal 76b. The opening operation signal 78 is selectively received by the individual operation panel 75 via the bus line, and the individual operation panel 75 sends the individual opening / closing signal 79a corresponding to the opening operation signal 78 to the control device 22 ( (See FIG. 1).
Based on the individual opening / closing signal 79a, the door bodies 7a and 7b responding to the individual opening / closing signal 79a are opened. Based on the opening operation, the indicator 53 displayed correspondingly between the door bodies 7 is turned off. The indicator 53 may be turned on after the door body 7 is closed.

The general control panel 72 that has received the door operation start signal 76 c transmits a confirmation signal 76 d for confirming that the door operation start signal 76 c has been received to the train transmitter / receiver 73 via the ground transmitter / receiver 74. However, if the train-side transceiver 73 does not receive the confirmation signal 76d, the driver or the conductor notifies the station clerk, and the conductor or the station clerk operates the door body opening / closing operator equipped on the platform 80. The opening signal of the door body 7 is transmitted to the individual operation panel 75 by manual operation.
After the passengers get on and off, when the train door is closed and the train departure signal is confirmed, this signal is sent from the train side transceiver 73 to the general control panel 72 via the ground side transceiver 74. It is done. The general control board 72 transmits a signal for closing all the door bodies 7 to the individual control board 75, and the door bodies 7 are closed. Subsequently, the departure signal is transmitted from the general control panel 72 to the operation command station 70 via the station monitoring panel 71, and the departure signal is transmitted from the operation instruction station 70 to the station monitoring panel 71 of the adjacent U station. A similar operation is repeated for each station where the train arrives.
Thus, the platform door 1 of the present invention can reduce the burden on the station staff by the control by the control device.

12 (a) to 12 (d) show an example in which the platform door 1 according to the present invention is applied when trains of various types of different door positions come and go on the same platform 80. FIG.
12A shows a case where there is no train on the platform 80, and FIGS. 12B to 12D show a state where a train with a different door position stops on the same platform 80. FIG. .
As shown in FIG. 12A, the platform doors 1 are installed in two rows before and after the platform, and a large number are arranged in the longitudinal direction of the platform 80. In the present embodiment, the support device 5 is disposed at the same position in the front and rear, and as shown in the platform doors 1c and 1f, the length of the door body 13 in the left-right direction may be changed. The lengths of the bodies 13 may be matched, only a few sets of door bodies 13 may be matched, or the lengths of all the door bodies 13 may be changed.

It is necessary to make the entrance / exit of the train 61 with a different door position coincide with the open part of the platform door and to guide the passenger there. Therefore, it is preferable to provide the platform 80 with an indicator 53 for providing information on where the next train door is to the passenger.
The display unit 53 is a divided tile in which a light emitter is embedded, and may be disposed at a place where a train entrance / exit is likely to be located on the platform 80, but the train stops along the longitudinal direction of the platform 80. You may provide in the whole position to do.
As shown in FIG. 12B, when a four-door train 61 arrives per vehicle, the display 53a portion (vertical hatch portion) corresponding to the entrance / exit 52 with the door 13 closed. Only the portion shown in the display 53b (outlined) that does not correspond to the entrance / exit 52 is not lit. Thereby, it can be judged in which position a passenger should line up. The indicator 53 is embedded in the floor surface of the platform 80, but it may be provided on the door body 13 or preferably on the upper part of the portion that becomes the entrance / exit 52.

As shown in FIG. 12B, when the door body 7 is opened corresponding to the entrance / exit 52 of the train 51 having four doors per vehicle, as described above, the door position of the train 51 input in advance is used. Etc., wireless instructions by the driver of the train 51, or manual operation, is performed by the control device 22 installed in the door body 13, and matches the position of the entrance / exit 52 of the train 51. That is, the door 13 of the platform door 1 facing the entrance / exit 52 can be opened or a required length can be advanced / retracted (stroke) to secure a passage for getting on / off.
FIG. 12C shows a case corresponding to a three-door train 51. For example, the door body 13 of the platform door 1d is slid to the right side from the state of FIG. 12B, and is also the door of the platform door 1e. The body 13 is slid rightward so that the position of the entrance 52 is opened.

  FIG. 12D shows an example in which the platform door 1 is operated corresponding to the two-door train 51. In a two-door train, for example, the door body 13 of the platform door 1d stays at the position shown in FIG. 12 (c), and the door body 13 of the platform door 1e is slid to the left side. Is forming. In any case, the door body 13 of the platform door 1 can be slid independently to open and close corresponding to the entrance / exit of each train 51, and the platform at a place where there is no entrance / exit is the door body. It is possible to smoothly get on and off the vehicle while securing the safety of passengers.

Although the embodiments of the present invention have been described above, the present invention is of course not limited thereto, and various modifications and changes can be made based on the technical idea of the present invention.
For example, in each of the above embodiments, one door 13 is supported by one support device 5, but one door 13 may be supported by two or more support devices 5. . However, the sliding amount of the door body 13 is more limited than that of one.
Further, the platform door 1 of each embodiment may be appropriately combined with another fixed fence, and the platform door 1 may be disposed between the fixed fences (or vice versa).
Although the positions of the support devices 5 are arranged in front and rear, they may be randomly arranged in the left-right direction.
Furthermore, the movable fence 13 can of course be used as a mere door for one normal entrance.

  As an example of use of the present invention, in addition to a train platform, when the entrances and exits of people are concentrated at the same time, such as bus stop stops and other stadium facility entrances and exits, opening and closing of the entrance is possible. The degree can be adjusted, and it can be widely used as a movable fence other than platform doors.

It is a front view of a platform door in an embodiment of the invention. It is sectional drawing of the AA line direction of FIG. It is sectional drawing of the BB line direction of FIG. It is the enlarged front view which looked at the support apparatus which supports the door body of the platform door shown in FIG. 1 from the front surface of the guidance apparatus. It is the expanded side view which looked at the support apparatus in the CC line direction of FIG. 4 from the side surface of the guide apparatus. It is the enlarged front view which looked at the drive device of the guide device shown in FIG. 1 from the front surface of the guide device. It is the expanded side view which looked at the drive device in the DD line direction of FIG. 6 from the side surface of the guide apparatus. It is a modification of the drive device of a guide apparatus shown in FIG. 1, and is the enlarged front view which looked at the drive apparatus from the front of the guide apparatus. It is the enlarged side view which looked at the drive device in the EE line direction of Drawing 8 from the side of a guide device. It is the enlarged front view which looked at the cam follower part of the guide device shown in FIG. 1 from the front surface of the guide device. It is the expanded sectional view which looked at the cam follower part in the FF line direction of FIG. 8 from the side surface of the guide apparatus. (A) is a top view which shows the door body position of the waiting state of the train in which the train does not enter into the platform in the embodiment of the present invention, and (b) is a state where the 4-door train is stopped at the platform. FIG. 4C is a plan view showing a door body position in a state where a three-door train is stopped at the platform, and FIG. 5D is a plan view showing a door body position of the two-door train. It is a top view which shows the door body position of the state which is carrying out. It is a management system figure which shows an example which controls opening and closing of the door body of embodiment of this invention. It is a front view of the door pocket and door which are used for the conventional platform. It is a front view which shows the structure of the door pocket and door body which are used for the conventional platform. It is sectional drawing seen from the plane direction of the door pocket and door body of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Platform door 3 Edge part 5 Support apparatus 7 Support | pillar 9 Frame 11 Support guide apparatus 13 Door body 15 Upper plate 17a, 17b Outer plate 19 Side plate 21 Rail attachment member 22 Control apparatus 23 Linear rail 24 Linear guide 27 Drive apparatus 28 Guide apparatus 31 rack 33 frame 34 drive motor 35 speed reducer 37 pinion 41 frame 42 mounting bolt 43 cam follower 44 mounting hole 61 train 62 boarding gate 63 indicator 80 platform

Claims (4)

A support device having a drive source provided on a platform into which a vehicle enters, and a movable fence provided with a door body that is supported by the support device and moves forward and backward in the entry direction of the vehicle by driving the support device.
A movable fence characterized in that a door is provided around the support device, and the door is opened in correspondence with the entrance of the vehicle. The movable fence according to claim 1, wherein opening and closing of each door body is controlled by a controller based on arrangement information of the entrance / exit of the vehicle. In a movable fence provided with a door body that is supported by a support device having a drive source and moves forward and backward in one direction by driving the support device,
A movable fence characterized in that a door body is provided around the support device, and the door body is opened corresponding to an entrance / exit of a facility. A display device capable of arbitrarily changing display or non-display along the advancing / retreating direction of the door body is provided, and the display of the display device is displayed in correspondence with the open position of the door body. The movable fence according to any one of claims 1 to 3.

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