JP2020131123A - Large-sized screen washing device - Google Patents

Abstract

To provide a large-sized screen washing device capable of safely and efficiently washing an existing large-sized screen.SOLUTION: A large-sized screen washing device 100 comprises: a pair of rails 2 that are arranged respectively above and below a large-sized screen 1 including an image plane 1a, and that extend in a width direction W of the large-sized screen 1; a ladder 10 which is bridged between the pair of rails 2 and is movable in the width direction W of the large-sized screen 1 along the pair of rails 2; and a washing unit 20 which is movable in a vertical direction H along the ladder 10. The washing unit 20 includes one washing brush 21 for washing the image plane 1a of the large-sized screen 1. The washing brush 21 is rotatable forward and backward, and a rotation direction of the washing brush 21 is reversed in accordance with a moving direction of the ladder 10.SELECTED DRAWING: Figure 1

Description

The present invention relates to a large screen cleaning device for cleaning a large screen installed outdoors.

Large screens installed in racetracks and outdoor stadiums are prone to dirt such as dirt, and require regular cleaning to prevent the screen brightness from decreasing. In the past, a worker got on an aerial work platform and manually wiped the screen of a large screen with a mop or the like to remove dirt. In places where there was no space for aerial work platforms, workers were riding on gondola and rope swings hung from the top of a large screen to perform cleaning work.

Further, when the cleaning work is not performed manually, a cleaning unit as shown in Patent Document 1 may be provided in a display device having a screen (display unit), and the display unit of the screen may be cleaned while moving the cleaning unit. It was done.

Japanese Unexamined Patent Publication No. 2012-157792

However, there is a problem that a large amount of work time is required when cleaning is performed manually as in the conventional case. In addition, there is a problem in safety because the worker needs to work at a high place.

Further, when a cleaning unit as described in Patent Document 1 is to be directly provided on a large screen, the structure of the large screen itself must be changed from an existing one to a new one, which is too costly. There is a problem that it will end up.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a large screen cleaning device capable of safely and efficiently cleaning an existing large screen.

The large screen cleaning device according to the present invention is provided above and below the large screen having a screen, respectively, and is bridged between a pair of rails extending in the width direction of the large screen and a pair of rails to form a pair of rails. The cleaning unit includes a rudder that can be moved in the width direction of the large screen along the rudder and a cleaning unit that can be moved up and down along the rudder and can be moved in the width direction of the large screen together with the rudder. It has a brush part for cleaning the screen of the above, and the brush part is configured by using one cleaning brush that can rotate forward and reverse, and the rudder and the cleaning unit move in the direction of rotation of the cleaning brush in the width direction of the large screen. It is inverted according to the moving direction of the time.

In the large screen cleaning device according to the present invention, the cleaning unit has a distance detecting unit that detects the distance between the cleaning unit and the screen of the large screen, and a position adjusting unit that adjusts the position of the cleaning unit with respect to the large screen. The distance detection unit has a pair of distance detection units arranged on one end side and the other end side in the width direction of the cleaning unit, and the position adjustment unit is performing cleaning work based on the detection results of the pair of distance detection units. The position of the cleaning unit may be adjusted so as to keep the distance between the cleaning unit and the screen of the large screen constant.

In the large screen cleaning device according to the present invention, the rudder has an upper moving portion that moves along the upper rail of the pair of rails and a lower moving portion that moves along the lower rail of the pair of rails. The cleaning unit includes an end detection unit that detects the widthwise end of the large screen, and the end detection unit is a pair of cleaning units arranged on one end side and the other end side in the width direction of the cleaning unit. It may have an end detection sensor.

In the large screen cleaning device according to the present invention, the cleaning unit includes a control unit that controls the operation of each part of the cleaning unit and a sprinkler nozzle that injects water onto the screen of the large screen, and the control unit has the width of the large screen. When the cleaning unit is moved in the direction, the injection of water by the sprinkler nozzle may be controlled based on the detection results of the pair of end detection sensors.

In the large screen cleaning device according to the present invention, the rudder may reciprocate in the width direction of the large screen, and the rotation direction of the cleaning brush may be reversed according to the moving direction of the rudder in the reciprocating movement.

In the large screen cleaning device according to the present invention, the cleaning unit includes a control unit that controls the operation of each part of the cleaning unit and one blow nozzle that blows air onto the screen of the large screen, and the control unit reciprocates the ladder. Of the outward path and the return path in the movement, the rudder may be controlled to blow air from the blow nozzle only when the rudder moves on the return path.

According to the large screen cleaning device according to the present invention, the existing large screen can be cleaned safely and efficiently.

It is a front view which shows the whole structure of the large screen cleaning apparatus which concerns on embodiment of this invention. It is a side view which shows the whole structure of the large screen cleaning apparatus shown in FIG. FIG. 3 is a top view showing a cleaning unit of the large screen cleaning device shown in FIG. It is a front view of the cleaning unit shown in FIG. It is a side view of the cleaning unit shown in FIG. It is sectional drawing which shows typically the shape of the screen surface of the large screen which the large screen cleaning apparatus shown in FIG. 1 cleans.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, the large screen cleaning device 100 has a pair of rails 2 provided above and below the large screen 1 and a ladder 10 bridged between the pair of rails 2. The pair of rails 2 has an upper rail 2a provided above the large screen 1 and a lower rail 2b provided below the large screen 1. The upper rail 2a and the lower rail 2b each extend along the width direction W of the large screen 1.
In this embodiment, the large screen 1 has a screen 1a having a height of about 12 m and a width of about 50 m.

The rudder 10 has an upper moving portion 11 that engages with the upper rail 2a and a lower moving portion 12 that engages with the lower rail 2b. The upper moving portion 11 and the lower moving portion 12 each have a roller (not shown) that engages with the upper rail 2a or the lower rail 2b. Further, as shown in FIG. 2, the upper moving portion 11 and the lower moving portion 12 each have motors 11a and 12a for driving the rollers. That is, by rotating the rollers by the motors 11a and 12a, the upper moving portion 11 and the lower moving portion 12 can move along the upper rail 2a or the lower rail 2b, respectively. Basically, the rudder 10 can move in the width direction W of the large screen 1 by moving the upper moving portion 11 and the lower moving portion 12 in the same direction at substantially the same speed.

Further, the rudder 10 has a pair of rudder rails 14 extending in the vertical direction H. A cleaning unit 20 is attached between the pair of rudder rails 14. The cleaning unit 20 is removable from the rudder 10. Further, the cleaning unit 20 can move in the vertical direction H along the rudder rail 14. A hoisting machine 31 is provided below the rudder 10. A part of the wire 32 is wound around the hoisting machine 31, and the wire 32 is hung on a pulley 33 provided on the upper part of the ladder 10 and one end thereof is connected to the cleaning unit 20. The hoisting machine 31 moves the cleaning unit 20 in the vertical direction H along the rudder 10 by unwinding the wire 32 or winding the wire 32. A tilt sensor 15 is attached to the rudder 10. The tilt sensor 15 detects the tilt of the ladder 10 with respect to the vertical axis. A control panel 5 is attached to the cleaning unit 20. The control panel 5 constitutes a control unit that comprehensively controls the operation of the large screen cleaning device 100. The control panel 5 captures the detection results of various detection units (described later) included in the cleaning unit 20. The control panel 5 controls the movement of the rudder 10, the movement of the cleaning unit 20, and the operation of each part of the cleaning unit 20. The control panel 5 includes a control system that performs various control processes based on a control program. The control system of the control panel 5 is electrically connected to the motors 11a and 12a and the tilt sensor 15. The movement of the upper moving unit 11 and the lower moving unit 12 is controlled by the control system of the control panel 5.

Further, as shown in FIGS. 3 to 5, the cleaning unit 20 is covered on the outside with a case 28. The case 28 is provided with a cleaning brush 21, a watering nozzle 22, and a blow nozzle 23. The cleaning brush 21, the watering nozzle 22, and the blow nozzle 23 are arranged on the screen 1a side of the large screen 1, that is, on the cleaning surface 20a of the cleaning unit 20. The cleaning brush 21 extends long in the vertical direction H. The cleaning brush 21 is removable from the cleaning unit 20. The cleaning brush 21 has brush bristles (not shown) that are not shown. The brush bristles of the cleaning brush 21 are preferably formed in a spiral shape like the brush bristles (21a) of the cleaning brush 21 described in Japanese Patent Application No. 2017-149705, which the applicant has previously applied for. The cleaning brush 21 is rotatably provided. The rotation axis of the cleaning brush 21 is an axis parallel to the vertical direction H. Further, the cleaning brush 21 is provided so as to be rotatable in both clockwise and counterclockwise directions around the rotation axis. That is, the cleaning brush 21 can rotate in the forward and reverse directions. Only one cleaning brush 21 is provided in the cleaning unit 20, and the brush portion for wiping the screen 1a of the large screen 1 is configured by using the cleaning brush 21. The rotation of the cleaning brush 21 is controlled by the control system of the control panel 5.

As shown in FIG. 3, one watering nozzle 22 is provided on each side of the cleaning brush 21 in the width direction of the cleaning unit 20. The width direction of the cleaning unit 20 is the same as the width direction W of the large screen 1. A plurality of injection ports (not shown) of the watering nozzle 22 are provided in the vertical direction H at predetermined intervals according to the length dimension of the cleaning brush 21 in the vertical direction H. The watering nozzle 22 sprays water onto the screen 1a of the large screen 1. The water injection by the watering nozzle 22 is controlled by the control system of the control panel 5. The blow nozzle 23 is arranged on the opposite side of the cleaning brush 21 with the center line in the width direction of the cleaning unit 20 sandwiched between the blow nozzles 23. The blow nozzle 23 extends long in the vertical direction H according to the length dimension of the cleaning brush 21 in the vertical direction H. The blow nozzle 23 blows air onto the screen 1a of the large screen 1. The blowing of air by the blow nozzle 23 is controlled by the control system of the control panel 5. A water supply hose 26 and a cable 27 are connected to the cleaning unit 20. As shown in FIG. 1, the water supply hose 26 is connected to the tank 9 mounted on the carriage 8. During the cleaning operation, the tank 9 is connected to the cleaning faucet 6. Further, during the cleaning operation, the cable 27 is connected to the cleaning power source 7.

Further, as shown in FIG. 4, the cleaning unit 20 is provided with a brush motor 51, a sprinkler pump 52, and a blower 53. The brush motor 51 is a drive source for rotating the cleaning brush 21. The watering pump 52 sends water toward the watering nozzle 22 at a predetermined water pressure. The water supply hose 26 is connected to the sprinkler pump 52. The blower 53 blows air toward the blow nozzle 23 at a predetermined wind pressure. The control system of the control panel 5 controls the rotation of the cleaning brush 21 via the brush motor 51. Further, the control system of the control panel 5 controls the injection of water by the watering nozzle 22 via the watering pump 52 and controls the blowing of air by the blow nozzle 23 via the blower 53.

Further, as shown in FIGS. 3 and 5, a pair of distance detection rollers 24 are attached to the lower side of the cleaning surface 20a of the cleaning unit 20. One distance detection roller 24 is arranged on one end side and one on the other end side in the width direction of the cleaning unit 20, thereby forming a pair of distance detection rollers 24. Each distance detection roller 24 is composed of, for example, a rubber roller, and is provided so as to be movable in the front-rear direction F as shown in FIG. Further, each distance detection roller 24 is urged by a spring (not shown) so as to be pressed against the screen 1a of the large screen 1. Here, the cleaning unit 20 is provided with a pair of position detection sensors (not shown) corresponding to the pair of distance detection rollers 24. The position detection sensor detects the position of the distance detection roller 24 that can move in the front-rear direction F. The pair of distance detection rollers 24 and the pair of position detection sensors constitute a pair of distance detection units. Further, the pair of distance detection units constitute a distance detection unit that detects the distance between the cleaning unit 20 and the screen 1a of the large screen 1. Specifically, when the cleaning surface 20a of the cleaning unit 20 approaches the screen 1a of the large screen 1, the distance detection roller 24 moves so as to be pushed inside the cleaning unit 20 as shown by the broken line 24a. Further, when the cleaning surface 20a of the cleaning unit 20 separates from the screen 1a of the large screen 1, the distance detection roller 24 separates from the screen 1a of the large screen 1 in a state of protruding from the cleaning surface 20a as shown by the broken line 24b. .. Therefore, by detecting the position of each distance detection roller 24 with the corresponding position detection sensor, the distance between the cleaning surface 20a of the cleaning unit 20 and the screen 1a of the large screen 1 can be detected. Further, by forming the pair of distance detection units by the pair of distance detection rollers 24 and the pair of position detection sensors, not only the distance between the cleaning surface 20a of the cleaning unit 20 and the screen 1a of the large screen 1 but also the cleaning surface 20a And the screen 1a can be detected.

Further, as shown in FIG. 3, the cleaning unit 20 is provided with a pair of end detection sensors 61 corresponding to the pair of distance detection rollers 24. One end detection sensor 61 is arranged on one end side and one end side in the width direction of the cleaning unit 20, thereby forming a pair of end detection sensors 61. The end detection sensor 61 detects the end of the large screen 1 by utilizing, for example, the movement of the distance detection roller 24 in the front-rear direction F. Specifically, in the end detection sensor 61, the distance detection roller 24 moves away from the end of the large screen 1 and moves to the position of the broken line 24b while the cleaning unit 20 moves in the width direction W of the large screen 1. Detects the edge of the large screen 1. In the present embodiment, a configuration is adopted in which the end portion of the large screen 1 is detected by utilizing the movement of the distance detection roller 24 in the front-rear direction F, but the present invention is not limited to this. For example, the end detection sensor 61 may be provided with a movable contactor (not shown), and the movement of the contactor may be used to detect the end portion of the large screen 1.

Further, as shown in FIGS. 3 to 5, two position adjusting rollers 25 are provided on both sides of the cleaning unit 20. As shown in FIG. 5, the position adjusting roller 25 is provided so as to be swingable around the swing shaft J. Further, as shown in FIGS. 3 and 4, the position adjusting roller 25 is engaged with the rudder rail 14 of the rudder 10. Therefore, when the position adjusting roller 25 swings around the swing shaft J, the position of the cleaning unit 20 changes in the front-rear direction F according to the swing direction and the swing amount of the position adjustment roller 25. The position adjusting roller 25 swings according to the drive of the position adjusting motor (not shown) mounted on the cleaning unit 20. Therefore, the position of the cleaning unit 20 with respect to the large screen 1 can be adjusted by controlling the drive of the position adjusting motor by the control system of the control panel 5 and swinging each position adjusting roller 25. At that time, the control system of the control panel 5 adjusts the position of the cleaning unit 20 as follows by controlling the drive of the position adjusting motor based on the detection results of the pair of distance detection units. That is, as shown in FIG. 5, during the cleaning operation, the cleaning brush 21 contacts the screen 1a with an appropriate pressure, and the cleaning unit 20 keeps a constant distance between the cleaning unit 20 and the screen 1a in this state. Adjust the position of. On the other hand, when the cleaning unit 20 is moving up or down along the rudder 10, the cleaning unit is separated from the cleaning unit 20 at the position indicated by the alternate long and short dash line 1a'. Adjust the position of 20. Further, in FIG. 5, the cleaning unit 20 is provided with a contact prevention switch 55. When the cleaning unit 20 is tilted with respect to the screen 1a of the large screen 1 when viewed from the direction shown in FIG. 5, the contact prevention switch 55 is a screen so that the cleaning surface 20a does not come into contact with the screen 1a due to this tilt. It is a sensor that detects an abnormal approach of the cleaning surface 20a with respect to 1a. When the contact prevention switch 55 detects an abnormal approach of the cleaning surface 20a with respect to the screen 1a, the cleaning surface 20a is separated from the screen 1a by the swing of the position adjusting roller 25.
The position adjusting roller 25 and the position adjusting motor constitute a position adjusting portion.

Next, a method of cleaning the large screen 1 by the large screen cleaning device 100 will be described. When cleaning the screen 1a of the large screen 1, the operation of the large screen cleaning device 100 is controlled by the control system of the control panel 5, including the operation of each part of the cleaning unit 20.
First, as a preparation for the cleaning work, the rudder 10 is hung between the upper rail 2a and the lower rail 2b and attached, and the rudder 10 is attached to either the left or right end of the large screen 1 in the width direction W of the large screen 1. Place it on the right end of. Further, with the cleaning unit 20 attached to the rudder 10, the wire 32 is wound up by the hoisting machine 31 to raise the cleaning unit 20 to the vicinity of the upper end of the large screen 1.

Next, the cleaning work of the large screen 1 by the cleaning unit 20 is started. This cleaning operation is an operation performed to remove dirt adhering to the screen 1a of the large screen 1. In this cleaning operation, the rudder 10 and the cleaning unit 20 reciprocate in the width direction W of the large screen 1 by the moving operation of the upper moving portion 11 or the lower moving portion 12. When the rudder 10 is arranged at the right end of the large screen 1 at the start of the cleaning work as in the present embodiment, the outward movement in the reciprocating movement corresponds to the case where the rudder 10 and the cleaning unit 20 move to the left L. However, the movement of the return route in the reciprocating movement corresponds to the case where the rudder 10 and the cleaning unit 20 move in the right direction R. Since the cleaning unit 20 moves in the width direction W of the large screen 1 together with the rudder 10, the cleaning unit 20 moves in the width direction W of the large screen 1 and the rudder 10 moves in the width direction W of the large screen 1. Is synonymous with. In the cleaning operation, the cleaning unit 20 reciprocates once in the width direction W of the large screen 1 while being held at the same position in the vertical direction H. Further, the cleaning unit 20 is lowered by a predetermined amount each time it finishes one reciprocating movement, and then reciprocates once again in the width direction W of the large screen 1. By repeating such an operation, the screen 1a of the large screen 1 is evenly washed. Hereinafter, the operation of each part during the cleaning operation will be described in more detail.

First, the water supplied from the cleaning faucet 6 to the tank 9 is supplied to the watering pump 52 through the water supply hose 26, and is injected from each watering nozzle 22 onto the screen 1a of the large screen 1 by driving the watering pump 52. To. Further, in the cleaning operation, the brush bristles of the cleaning brush 21 come into contact with the screen 1a of the large screen 1, and in this state, the cleaning brush 21 rotates according to the drive of the brush motor 51. As a result, the screen 1a of the large screen 1 is cleaned by the cleaning brush 21, and the dirt on the screen 1a is removed. The cleaning unit 20 moves to the left L in FIG. 1 together with the rudder 10 while performing such cleaning work. Then, when the cleaning unit 20 reaches the end of movement on the left end side of the large screen 1, the movement of the ladder 10 and the cleaning unit 20 is temporarily stopped. When the cleaning unit 20 moves to the left L, air is not blown from the blow nozzle 23 to the screen 1a of the large screen 1.

During the cleaning operation by the cleaning unit 20, each of the pair of distance detection rollers 24 is in contact with the screen 1a of the large screen 1. If it is determined that the cleaning unit 20 is too far away from or too close to the screen 1a of the large screen 1 depending on the positions of the pair of distance detection rollers 24, the position adjustment roller 25 swings. Adjusts the position of the cleaning unit 20. As a result, the distance between the cleaning unit 20 and the screen 1a of the large screen 1 is kept constant.

Further, when the tilt sensor 15 detects that the ladder 10 is tilted with respect to the vertical axis while the ladder 10 and the cleaning unit 20 are moving in the width direction W of the large screen 1, the control system of the control panel 5 The moving speed of the upper moving portion 11 or the lower moving portion 12 is appropriately changed so as to eliminate the inclination of the rudder 10. As a result, the rudder 10 is maintained vertically even during movement. Further, in accordance with the movement of the rudder 10, the worker P appropriately moves the carriage 8 on which the tank 9 is mounted. The tank 9 may be directly attached to the lower part of the rudder 10 without being mounted on the carriage 8.

Further, when the cleaning unit 20 moves in the left direction L together with the rudder 10, when the cleaning unit 20 moves near the moving end in the moving direction L, the pair of end detection sensors 61 sequentially detect the left end of the large screen 1. At this time, the control system of the control panel 5 stops the movement of the upper moving portion 11 and the lower moving portion 12 based on the detection results of the pair of end detection sensors 61. When stopping the movement of the upper moving portion 11 and the lower moving portion 12, any of the detection results of the pair of end detection sensors 61 may be referred to. For example, in the control system of the control panel 5, when the end detection sensor 61 on the downstream side (left side in FIG. 3) of the moving direction L detects the left end of the large screen 1, the time when the first time elapses from this detection timing. Stops the movement of the upper moving portion 11 and the lower moving portion 12. Further, in the control system of the control panel 5, when the end detection sensor 61 on the upstream side (right side in FIG. 3) of the moving direction L detects the left end of the large screen 1, the detection timing is shorter than the first time. When the time of 2 has elapsed, the movement of the upper moving portion 11 and the lower moving portion 12 is stopped. As a result, the cleaning unit 20 stops at the end of movement in the movement direction L. In this stopped state, a part or almost all of the cleaning unit 20 is separated from the left end of the large screen 1 in the width direction W of the large screen 1. Further, in the control system of the control panel 5, when the end detection sensor 61 located on the downstream side of the moving direction L of the cleaning unit 20 detects the left end of the large screen 1, the watering nozzle 22 emits the watering nozzle 22 almost at the same time as the detection timing. Stop the water jet. As a result, the water injection from the watering nozzle 22 can be stopped before the water injection position by the watering nozzle 22 deviates from the large screen 1. Therefore, it is possible to prevent the water jetted from the watering nozzle 22 from coming off the large screen 1 and scattering to the surroundings.

After that, the position of the cleaning unit 20 is adjusted so as to be separated from the screen 1a of the large screen 1 by swinging the position adjusting roller 25. As a result, the cleaning brush 21 is separated from the screen 1a of the large screen 1. Next, the control system of the control panel 50 switches the moving direction of the ladder 10 and the cleaning unit 20 from the left direction L to the right direction R, and reverses the rotation direction of the cleaning brush 21 with the switching of the moving direction. As a result, the cleaning unit 20 starts moving in the right direction R together with the rudder 10. Further, when the rudder 10 is reciprocated in the width direction W of the large screen 1, the rotation direction of the cleaning brush 21 is reversed according to the moving direction of the rudder 10 in this reciprocating movement, so that the cleaning brush 21 moves on the outward path. When you do, it rotates in the opposite direction.

When the cleaning unit 20 starts moving in the right direction R and the end detection sensor 61 located on the upstream side (left side in FIG. 3) of the moving direction R detects the left end of the large screen 1, the control panel 5 The control system restarts the injection of water from the watering nozzle 22. Further, when the cleaning unit 20 moves to the right R, air is blown from the air outlet 23a of the blow nozzle 23 to the screen 1a of the large screen 1. As a result, excess water is blown off from the screen 1a of the large screen 1. After that, when the cleaning unit 20 moves near the moving end in the moving direction R, the pair of end detection sensors 61 sequentially detect the right end of the large screen 1. As a result, the control system of the control panel 5 stops the cleaning unit 20 at the moving end in the moving direction R and stops the water injection from the watering nozzle 22 by the same principle as described above.

In this way, when the cleaning unit 20 reciprocates once in the width direction W of the large screen 1, the position of the cleaning unit 20 is adjusted so as to be separated from the screen 1a of the large screen 1 by the swing of the position adjusting roller 25. Next, the cleaning unit 20 is lowered by a predetermined amount by feeding out the wire 32 from the hoisting machine 31 by a predetermined length. As a result, the cleaning target area of the large screen 1 is set below the washed area. Next, the position of the cleaning unit 20 is adjusted so as to approach the screen 1a of the large screen 1 by swinging the position adjusting roller 25. As a result, the brush bristles of the cleaning brush 21 are arranged so as to be in contact with the screen 1a of the large screen 1. Further, the pair of distance detection rollers 24 are also arranged so as to be in contact with the screen 1a of the large screen 1. After that, the screen 1a of the large screen 1 is evenly washed by repeating the same operation.

The movement of the rudder 10 in the width direction W of the large screen 1 and the movement of the cleaning unit 20 in the vertical direction H are basically performed automatically, but if there is a particularly conspicuous part, the operator manually operates the screen 1. It is also possible to move the rudder 10 and the cleaning unit 20 to a desired location to perform intensive cleaning.
Further, when the large screen 1 is not cleaned, the rudder 10 is placed in a space beside or behind the large screen 1.

From the above, in the large screen cleaning device 100 according to the first embodiment, the rudder 10 is movably bridged between the upper rail 2a and the lower rail 2b provided above and below the large screen 1, respectively. A cleaning unit 20 that can move up and down is provided in 10. As a result, the existing large screen 1 can be mechanically cleaned by the cleaning unit 20. In addition, since the manual cleaning work is not required, the work time required for cleaning is shortened. In addition, safety is improved because workers do not have to perform cleaning at high places. Further, since the aerial work platform is not required for the cleaning work, the cost related to the work cost and the vehicle cost can be reduced. Further, in the large screen cleaning device 100 according to the first embodiment, one cleaning brush 21 that can rotate forward and reverse is provided in the cleaning unit 20, and the moving direction when the rudder 10 moves in the width direction W of the large screen 1. A configuration is adopted in which the rotation direction of the cleaning brush 21 is reversed according to the above. Therefore, when the rudder 10 and the cleaning unit 20 are reciprocated in the width direction W of the large screen 1 to perform the cleaning work, even if the moving directions of the rudder 10 are different between the outward route and the return route, the moving direction of the cleaning unit 20 is the same. The relationship with the rotation direction of the cleaning brush 21 can be kept constant. Therefore, it is possible to suppress the occurrence of cleaning unevenness due to the difference in the moving direction of the ladder 10. Further, since the number of cleaning brushes 21 is the minimum required, the mass of the entire cleaning unit 20 can be reduced. Further, since only one blow nozzle 23 is required according to the number of cleaning brushes 21, the weight of the cleaning unit 20 can be further reduced. Further, when the brush bristles of the rotating cleaning brush 21 are brought into contact with the screen 1a of the large screen 1, the brush bristles of the cleaning brush 21 fall in one direction. Therefore, when the cleaning brush 21 is always rotated in one direction, the brush bristles are released. It is habituated in a state of being tilted in one direction, and the life of the cleaning brush 21 is shortened due to a decrease in the cleaning effect accompanying this. On the other hand, if the cleaning brush 21 is provided so as to be rotatable in the forward and reverse directions as in the first embodiment and the rotation direction of the cleaning brush 21 is reversed according to the moving direction of the rudder 10, the rudder 10 is moved to the left L. The direction in which the brush bristles of the cleaning brush 21 fall is opposite between the case of moving and the case of moving to the right R. Therefore, the brush bristles of the cleaning brush 21 are less likely to be habituated. Therefore, the life of the cleaning brush 21 can be extended.

Further, since the screen 1a of the large screen 1 has a large number of LEDs 1b and eaves 1c provided for each LED as shown in FIG. 6, there are many irregularities. Therefore, dirt tends to accumulate between the irregularities of the screen 1a. Here, since the cleaning brush 21 provided in the cleaning unit 20 of the large screen cleaning device 100 can rotate in the forward and reverse directions, the screen 1a can be rubbed from multiple directions. Therefore, even a large screen 1 having a screen 1a composed of a plurality of LEDs 1b can more reliably remove dirt.

Further, the cleaning unit 20 has a pair of distance detection rollers 24 for detecting the distance between the cleaning unit 20 and the screen 1a of the large screen 1, and a position adjusting roller 25 for adjusting the position of the cleaning unit 20 with respect to the large screen 1. .. Therefore, the distance between the cleaning unit 20 and the screen 1a of the large screen 1 is always kept constant. Therefore, it is possible to prevent unevenness in the degree of dirt removal from the screen 1a. Further, since one distance detection roller 24 is arranged on each one end side and the other end side in the width direction of the cleaning unit 20, not only the distance between the cleaning unit 20 and the screen 1a of the large screen 1 but also cleaning is performed. The inclination of the cleaning surface 20a of the unit 20 and the screen 1a of the large screen 1 can be detected. Therefore, if there is a risk that the cleaning surface 20a may come into contact with the screen 1a due to the inclination of the cleaning surface 20a of the cleaning unit 20 and the screen 1a of the large screen 1, the cleaning surface 20a should be separated from the screen 1a. By swinging the position adjusting roller 25 based on the detection results of the pair of distance detection rollers 24, contact between the cleaning surface 20a and the screen 1a can be avoided.

Further, the cleaning unit 20 includes a pair of end detection sensors 61 that detect the end of the large screen 1 in the width direction W. Therefore, in the control system of the control panel 5, the moving operation of the upper moving portion 11 and the lower moving portion 12 and the rotating operation of the cleaning brush 21 are controlled based on the detection results of the pair of end detection sensors 61. Can be done. As a result, when the cleaning unit 20 is moved together with the rudder 10 in the width direction W of the large screen 1, the cleaning unit 20 can be accurately stopped at a desired position at the end of the large screen 1. Further, in the present embodiment, a configuration in which a pair of end detection sensors 61 are arranged on one end side and the other end side in the width direction of the cleaning unit 20 is adopted. Therefore, regardless of whether the cleaning unit 20 is moved in the left direction L or the right direction R in the width direction W of the large screen 1, one of the cleaning units 20 is moved before the cleaning unit 20 is largely removed from the end portion of the large screen 1. The edge detection sensor 61 can detect the edge of the large screen 1. Therefore, by controlling the water injection by the watering nozzle 22 based on the detection result of the pair of end detection sensors 61, the watering nozzle is used regardless of whether the cleaning unit 20 is moved in the left direction L or the right direction R. The timing of water injection by 22 can be appropriately controlled. As a result, it is possible to avoid a situation in which the water ejected from the watering nozzle 22 deviates from the large screen 1 and scatters around.

Further, when the tilt sensor 15 detects the tilt of the ladder 10 while the ladder 10 is moving, the control panel 5 changes the moving speed of the upper moving portion 11 or the lower moving portion 12 to correct the tilt of the ladder 10. Keep the rudder 10 vertical. As a result, even when the tall rudder 10 is moved, the cleaning work can be performed more reliably without tilting the rudder 10.

1 Large screen, 1a screen, 2 rails, 2a upper rail, 2b lower rail, 5 control panel (control unit), 10 ladder, 11 upper moving part, 12 lower moving part, 20 cleaning unit, 21 cleaning brush (brush) Part), 24 distance detection roller (distance detection part), 25 position adjustment roller (position adjustment part), 61 end detection sensor, 100 large screen cleaning device, H vertical direction, W width direction.

Claims (6)

A pair of rails provided above and below a large screen having a screen and extending in the width direction of the large screen,
A rudder that is bridged between the pair of rails and can move along the pair of rails in the width direction of the large screen.
A cleaning unit that is movable in the vertical direction along the rudder and is movable in the width direction of the large screen together with the rudder is provided.
The cleaning unit has a brush portion for cleaning the screen of the large screen.
The brush portion is configured by using one cleaning brush that can rotate forward and reverse.
A large screen cleaning device in which the rotation direction of the cleaning brush is reversed according to the moving direction when the rudder and the cleaning unit move in the width direction of the large screen. The cleaning unit is
A distance detection unit that detects the distance between the cleaning unit and the screen of the large screen, and
It has a position adjusting unit for adjusting the position of the cleaning unit with respect to the large screen.
The distance detection unit has a pair of distance detection units arranged on one end side and the other end side in the width direction of the cleaning unit.
Based on the detection results of the pair of distance detection units, the position adjusting unit positions the cleaning units so as to keep the distance between the cleaning unit during the cleaning operation and the screen of the large screen constant. The large screen cleaning device according to claim 1, which is adjusted. The rudder
Of the pair of rails, an upper moving portion that moves along the upper rail and
Of the pair of rails, a lower moving portion that moves along the lower rail is provided.
The cleaning unit is
An end detection unit that detects the end portion of the large screen in the width direction,
The large screen cleaning device according to claim 1 or 2, wherein the end detection unit has a pair of end detection sensors arranged on one end side and the other end side in the width direction of the cleaning unit. The cleaning unit is
A control unit that controls the operation of each part of the cleaning unit,
A watering nozzle for injecting water onto the screen of the large screen is provided.
3. The control unit controls the injection of water by the watering nozzles based on the detection results of the pair of end detection sensors when the cleaning unit is moved in the width direction of the large screen. Large screen cleaning device described in. The rudder reciprocates in the width direction of the large screen, and the rotation direction of the cleaning brush is reversed according to the moving direction of the rudder in the reciprocating movement, according to any one of claims 1 to 4. The large screen cleaning device described. The cleaning unit
A control unit that controls the operation of each part of the cleaning unit,
The large screen is provided with one blow nozzle that blows air onto the screen.
The large-scale screen cleaning device according to claim 5, wherein the control unit controls to blow air from the blow nozzle only when the rudder moves on the return path among the outward path and the return path in the reciprocating movement of the rudder.

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