JP7609759B2 - Passenger conveyor inspection device - Google Patents

Description

The present invention relates to a passenger conveyor inspection device .

Conventionally, inspections for dust and fallen objects (hereinafter referred to as "dust, etc.") inside the frame of passenger conveyors, such as escalators, have been carried out visually by workers. For this visual inspection for dust, etc., several steps on the outgoing side (forward way side) and/or the returning side (return way side) inside the frame have been removed each time an inspection is carried out.

Patent Document 1 describes a technology in which a support pillar with an index for determining the amount of accumulated foreign matter such as dirt is erected vertically on an oil pan below the return side of the steps, and the state of foreign matter accumulating below the return side of the steps is photographed with a surveillance camera. The technology described in Patent Document 1 sends the image captured by the surveillance camera to a worker's mobile device, and the worker views the image displayed on the mobile device to check the amount of accumulated dirt using the index on the support pillar as a reference.

JP 2004-224558 A

However, the technology described in Patent Document 1 involves removing the steps of an existing escalator, installing a camera behind the steps, and erecting the support pillars. In order to erect the support pillars, it is necessary to remove the steps on the return path (return side) immediately above the support pillars, and two steps on the outward path (going side), for a total of four steps. This removal work is likely to occur not only the first time, but also when replacing support pillars due to dirt, etc., and there is a problem in that this removal work is very time-consuming.

An object of the present invention is to provide a passenger conveyor inspection device that can determine the amount of dust and other particles accumulated inside the frame of a passenger conveyor without removing the steps.

In order to solve the above problems, for example, the configurations described in the claims are adopted.
The present application includes multiple means for solving the above problems, and as one example, the passenger conveyor inspection device of the present invention comprises a housing whose length in the direction of travel is shorter than its length in the direction perpendicular to the direction of travel, a caterpillar track with three pairs of wheels attached to the housing to enable the housing to move, a camera attached to the housing, an indicator for measuring the amount of dust accumulation present within the frame based on an image captured by the camera, and a control unit for controlling the movement of the housing.

According to the present invention, it is possible to determine the amount of accumulated dust and other particles inside the frame without removing the steps.
Problems, configurations and effects other than those described above will become apparent from the following description of the embodiments.

1A to 1C are diagrams showing the structure (plan view, front view, and side view) of a passenger conveyor inspection device according to a first embodiment of the present invention and the overall configuration of the system. 1 is a diagram showing the configuration of an internal structure of a passenger conveyor inspection device according to a first embodiment of the present invention; 1 is a diagram for explaining the function of a passenger conveyor inspection device according to a first embodiment of the present invention; FIG. 1 is a diagram for explaining how a passenger conveyor inspection device according to a first embodiment of the present invention moves sequentially over a horizontal section, a bend section, and an inclined section of an escalator. FIG. 1 is a diagram showing a passenger conveyor inspection device according to a first embodiment of the present invention moving inside an escalator frame and checking the amount of dust accumulation inside the frame with a marker. FIG. FIG. 1 is a diagram showing locations to be cleaned by mapping the amount of dust accumulation in a passenger conveyor inspection device according to a first embodiment of the present invention. 1 is a block diagram showing the functions of a passenger conveyor inspection device according to a first embodiment of the present invention; 4 is a flowchart showing a workflow for photographing inside a frame in the passenger conveyor inspection device according to the first embodiment of the present invention. 5 is a flowchart showing a process for automatically determining the amount of dust accumulation in the passenger conveyor inspection device according to the first embodiment of the present invention. 5 is a flowchart for explaining a mapping process of dust accumulation locations in the passenger conveyor inspection device according to the first embodiment of the present invention. 11A to 11C are diagrams showing the structure (plan view, front view, and side view) of a passenger conveyor inspection device according to a second embodiment of the present invention.

<Structure and system configuration of passenger conveyor inspection device>
A passenger conveyor inspection device according to a first embodiment of the present invention (hereinafter referred to as "this example") will be described below with reference to Figs. 1 to 10, taking a representative escalator inspection device as an example.
Fig. 1 is a diagram showing the structure and system configuration of a passenger conveyor inspection device of this embodiment, and Fig. 2 is a diagram showing the detailed internal configuration of the passenger conveyor inspection device of this embodiment.

As shown in FIG. 1, the passenger conveyor inspection device of this example is composed of a self-propelled camera 1 with a communication function (hereinafter abbreviated as "self-propelled camera 1"), and a control terminal 2 is connected to this self-propelled camera 1 by a lifeline/communication cable 3 (hereinafter abbreviated as "communication cable 3").
With the passenger conveyor stopped, the self-propelled camera 1 travels within the frame of the passenger conveyor by operating the control terminal 2. The self-propelled camera 1 is usually caused to travel from top to bottom, but in special circumstances it may be caused to travel from bottom to top. Note that the self-propelled camera includes not only cameras that can move autonomously, but also cameras that move under human instructions by remote control.

The communication cable 3 is provided with a connector 2a for connecting to the control terminal 2. The communication cable 3 is a cable for communicating control signals or image signals by wire between the self-propelled camera 1 and the control terminal 2, but this communication cable 3 also functions as a lifeline in case the self-propelled camera 1 stops working for some reason. Note that communication between the self-propelled camera 1 and the control terminal 2 can also be performed wirelessly.

As shown in FIG. 1, the self-propelled camera 1 is equipped with a caterpillar track 4 and a dust cover 5 (see plan view 1a). The dust cover 5 is intended to prevent foreign objects from entering the self-propelled camera 1. The self-propelled camera 1 also has a camera 6, a light source 7, and a marker 8 mounted within a housing 9. The camera 6 functions as an imaging unit that captures foreign objects such as dust and fallen objects within the frame of the escalator.

The housing 9 is a thin rectangular housing that is long in the direction perpendicular to the traveling direction of the self-propelled camera 1. This housing 9 is divided into front and back in the traveling direction, and is configured so that the front and rear parts bend when moving from the horizontal part to the inclined part inside the frame, and when moving from the inclined part to the horizontal part.

The marker 8 is a reference index for determining the amount of accumulated dust. In other words, the marker 8 indicates a judgment value (threshold value) for the amount of accumulated dust. As will be described later in FIG. 3, the upper end of the black part of the marker 8 indicates the threshold value, and if the amount of accumulated dust does not exceed the upper end of the black part of the marker 8, it is judged as good. Furthermore, the caterpillar 4 is provided with a drive wheel 4a and driven wheels 4b, 4c. When the self-propelled camera 1 moves inside the frame of the escalator, the drive wheel 4a is rotated by a motor (not shown), and the caterpillar 4 rotates in conjunction with the rotation of the drive wheel 4a and driven wheels 4b, 4c, moving the self-propelled camera 1 forward.

<Internal structure of self-propelled camera 1>
As described in Fig. 1, the self-propelled camera 1 includes a caterpillar 4, a dust cover 5, a camera 6, a light source 7, and a marker 8. Fig. 2 shows the internal structure of the self-propelled camera 1. That is, as shown in Fig. 2, the self-propelled camera 1 includes a drive unit 10, a control panel 11, a power source 12, hinges 13, a communication device 14, an oil seal 15, and a marker arm 16.

The drive unit 10 rotates the drive wheels 4a of the caterpillar tracks 4 at a predetermined speed in response to commands from the control terminal 2. Similarly, the control panel 11 sends control commands to each part of the self-propelled camera 1 based on commands from the control terminal 2, and processes and stores images captured by the camera 6. The power source 12 supplies power to each part of the self-propelled camera 1, including the camera 6 and the light source 7.

The hinge 13 also provides a predetermined angle at the front and rear of the caterpillar track 4 at the bend points through which the self-propelled camera 1 passes when moving from the horizontal to the inclined part of the escalator frame, or from the inclined part to the horizontal part. This allows the caterpillar track 4 and the housing 9 to move without interfering with the steps, even at the bend points.

The inclination angle of this bend will vary depending on the installation location and conditions of the escalator, but in any case, hinge 13 is necessary to allow self-propelled camera 1 to pass through the bend smoothly. In other words, hinge 13 has the function of preventing interference between self-propelled camera 1 and the escalator body when self-propelled camera 1 moves from the horizontal section to the inclined section.

The communication device 14 has the necessary functions for communicating image information and control information between the self-propelled camera 1 and the control terminal 2. The oil seal 15 is made of a resin material that fills the gaps in the housing 9, and has the function of preventing oil from entering the self-propelled camera 1. The marker arm 16 is an arm that expands and contracts in the direction of travel of the self-propelled camera 1, and has the function of moving the marker 8 at its tip closer to the position of dust in order to measure the amount of dust accumulation.

<Embodiments and Functions of the Passenger Conveyor Inspection Device>
Next, with reference to Figs. 3 to 5, a specific embodiment of the self-propelled camera 1 used in the passenger conveyor inspection device of this embodiment and its function will be described using an escalator as an example.
3 shows a plan view 1a and a side view 1c of the self-propelled camera 1, and a display screen 22 of the control terminal 2. As shown in Fig. 3, the self-propelled camera 1 captures an image of the amount of accumulated dust 20 present in its direction of travel (the direction of the arrow).

An image including dust 20 and marker (index) 8 captured by camera 6 of self-propelled camera 1 is sent to control terminal 2. Then, as shown in FIG. 3, the image of dust 20 and marker 8 is displayed on display screen 22 of control terminal 2. As already mentioned, the upper limit of the black color of marker 8 is judgment value 21, and as can be seen from display screen 22 of FIG. 3, the amount of accumulated dust 20 does not exceed judgment value 21, so in this case it is determined that cleaning does not need to be started.

Figure 4 shows how the self-propelled camera 1 passes through the horizontal section 30, the bending point section 32, and the inclined section 31 in sequence. At the bending point section 32, an angle sensor (not shown) attached to the hinge 13 detects the inclination angle, so that the caterpillar track 4 is bent according to the inclination of the bending point section 32. An acceleration sensor can also be used to detect the inclination of the bending point section 32.

As the number of times an escalator is operated increases, dust 20 accumulates in all of the escalator's horizontal sections 30, bends 32, and inclined sections 31; however, on-site investigations have shown that dust 20 tends to accumulate particularly within a range of 2 m before and after bends 32. The location where dust 20 accumulates has almost no relation to the direction in which the escalator is operating. In other words, the amount of dust that accumulates increases around 2 m before and after bends 32, with no correlation to the operating direction. The location of an oil pan, where oil tends to accumulate, is also around 2 m before and after this bend 32. Dust 20 tends to accumulate at the top when the escalator is ascending, and at the bottom when it is descending.

Figure 5 shows the self-propelled camera 1 passing through the horizontal section 30 within the frame of the escalator. In the example of Figure 5, the self-propelled camera 1 moves from the top to the bottom within the frame of the escalator along the arrows a and b. The worker 40 carries the control terminal 2 and can determine where the dust has accumulated within the frame from the amount of dust 20 displayed on the display screen 22 of the control terminal 2 and the position of the self-propelled camera 1. The display screen 22 of the control terminal 2 in Figure 5 shows an amount of dust 20 accumulated that exceeds the upper limit judgment value 21 of the black portion of the marker 8. Therefore, the worker 40, looking at this display screen 22, determines that the area of the displayed dust 20 needs cleaning.

Figure 6 is a diagram showing the locations that are particularly in need of cleaning by mapping the amount of dust accumulation inside the escalator frame. As shown in Figure 6, the self-propelled camera 1 travels inside the escalator frame 41 from the top to the bottom. (a) to (d) shown in the diagram at the bottom of Figure 6 show images captured by the camera 6 as the self-propelled camera 1 moves inside the frame 41. Each image (a) to (d) corresponds to a position inside the escalator frame.

Figure 6(a) shows the position of the upper horizontal part, where there is almost no dust accumulation inside the frame 41. Figure 6(b) corresponds to the position of the inclined part, where an amount of accumulated dust 20 can be seen, but since the dust 20 at this position of the inclined part is within the judgment value (threshold value) of the marker 8, it is determined that cleaning should not be started. Figure 6(c) shows the amount of accumulated dust 20 at a position close to the bending point at the bottom of the inclined part. The amount of dust accumulated at a position close to the bending point at the bottom of this frame 41 exceeds the judgment value (threshold value) of the marker 8. Therefore, the worker 40 will start the task of removing the dust 20 at this position.

The steps of the escalator that are downward facing and are shown with thick diagonal lines at the top of Figures 6(a) to (d). By counting the number of steps, it is possible to know the position of the self-propelled camera 1 within the frame. From the result, it is possible to accurately display the locations with the largest amount of dust 20 accumulation on the display screen of the control terminal 2, as will be described later in Figure 10.

The diagram at the top of Figure 6 is a mapping diagram of the location of dust 20 where the amount of dust 20 accumulated exceeds the judgment value (threshold value) of the icon of the self-propelled camera 1 and the marker 8 displayed on the display screen 22 of the control terminal 2 carried by the worker 40. By looking at this diagram at the top, the worker can see the location 20a within the frame 41 where the work of removing the dust 20 needs to be performed, and can therefore quickly perform the work of removing the dust 20 within the frame 41.

<Functions of passenger conveyor inspection device>
FIG. 7 is a block diagram showing the functions of the passenger conveyor inspection device of this embodiment, and in particular shows the functions of the self-propelled camera 1 and the control terminal 2 as blocks.
The self-propelled camera 1 includes an imaging unit 50, an image processing unit 51, a judgment processing unit 52, a storage unit 53, a control unit 54, a driving unit 55, a power supply unit 56, a field of view driving unit 57, a tilt detection unit 58, and a communication unit 59.

The imaging unit 50 corresponds to the camera 6 shown in Figs. 1 and 2, and captures images including dust particles 20 that fall within the viewing angle of the camera 6 on the path of the self-propelled camera 1. The image processing unit 51 processes the images captured by the imaging unit 50. For example, if the image captured by the imaging unit 50 is a color image, it converts it into a black and white image to emphasize the dust particles 20, or it emphasizes the contours of the image.

The judgment processing unit 52 judges whether the amount of dust 20 accumulated in the image processed by the image processing unit 51 exceeds the judgment value (threshold value) 21. If the amount of dust 20 accumulated does not exceed the judgment value, the work of removing the dust 20 does not start. On the other hand, if the amount of dust 20 accumulated exceeds the judgment value 21, the worker 40 starts the work of removing the dust. The judgment result of the judgment processing unit 52 is stored in the storage unit 53.

The drive unit 55 corresponds to the drive device 10 shown in FIG. 2 and has the function of driving the drive wheels 4a of the caterpillar tracks 4. The power supply unit 56 is the power supply 12 shown in FIG. 2 and supplies power to each component of the self-propelled camera 1. The viewing angle drive unit 57 has the function of changing the viewing angle of the camera 6 and is part of the function of the control panel 11 in FIG. 2.

The tilt detection unit 58 is an angle sensor or acceleration sensor (not shown) attached to the hinge 13 shown in FIG. 2, and has the function of detecting the tilt angle when the self-propelled camera 1 reaches the bending point 32 (see FIG. 4) of the frame body 41, and bending the front and rear of the caterpillar 4 to match the tilt of the bending point 32. The communication unit 59 is the same as the communication device 14 in FIG. 2, and communicates control information and image information with the control terminal 2 via the network N, either wired or wirelessly.

The control unit 54 is equivalent to the CPU (Central Processing Unit) of the computer that constitutes the core of the self-propelled camera 1, and is responsible for the overall control of the self-propelled camera 1. Specifically, the control unit 54 is a computer that controls each part provided in the control panel 11 shown in FIG. 2. In addition to the control unit 54, the control panel 11 includes an image processing unit 51, a judgment processing unit 52, and a storage unit 53.

The control terminal 2 is a mobile terminal, such as a smartphone, held by the worker 40. The control terminal 2 includes an operation display unit 60, a control unit 61, a communication unit 62, a power supply unit 63, and a storage unit 64. The operation display unit 60 constitutes the display screen 22 of the control terminal 2, and the display unit 60a displays the processed image sent from the self-propelled camera 1. The input unit 60b of the operation display unit 60 functions as an operation unit that inputs various control signals when the worker 40 controls the self-propelled camera 1.

The control unit 61 corresponds to the CPU of the control terminal 2, and controls each part of the control terminal 2. For example, it has a function of displaying an image transmitted from the self-propelled camera 1 on the display unit 60a, and transmitting a control signal and an operation signal input from the input unit 60b to the self-propelled camera 1.
The communication unit 62 communicates image signals and control signals with the communication unit 59 of the self-propelled camera 1 via the network N. The power supply unit 63 supplies power to each unit of the control terminal 2. The storage unit 64 is connected to the control unit 61 and has a function of temporarily or long-term storage of information processed by the control unit 61.

<Information processing flow in the self-propelled camera 1>
Next, a process flow relating to an inspection method using the passenger conveyor inspection device of this embodiment will be described with reference to the flowcharts of FIGS.
FIG. 8 is a flow chart showing a workflow for photographing the inside of the frame 41 of an escalator by the self-propelled camera 1 in the passenger conveyor inspection device of this embodiment.

First, the worker 40 sets up the self-propelled camera 1 in the upper machine room (S10). Then, the worker 40 connects the set up self-propelled camera 1 to the control terminal 2 (S11). Next, the worker 40 operates the control terminal 2 at hand to move the self-propelled camera 1 and start capturing images with the imaging unit 50 (corresponding to camera 6) of the self-propelled camera 1 (S12).

When self-propelled camera 1 starts capturing images in step S12, imaging section 50 of self-propelled camera 1 captures images of the upper horizontal section, the inclined section, and the lower horizontal section of the frame in sequence (S13).
The image captured by the imaging unit 50 of the self-propelled camera 1 is displayed on the display screen 22 of the control terminal 2 of the worker 40, so the worker 40 can check whether the amount of dust accumulation exceeds the judgment value 21 of the marker 8 by looking at the captured image displayed on the display screen 22 (S14). The self-propelled camera 1 then moves to the machine room below and is collected by the worker 40 (S15). When the above process is completed, the photographing work inside the escalator frame 41 is finished.

FIG. 9 is a flow chart showing a process flow for automatically determining the amount of dust accumulation in the passenger conveyor inspection device of this embodiment.
First, the imaging unit 50 of the self-propelled camera 1 acquires the captured image captured by the camera 6 (S20). Then, the image processing unit 51 of the self-propelled camera 1 extracts still images for each frame of the acquired captured image (S21), and converts the extracted color still images into black and white images (S22).
Furthermore, the image processing unit 51 extracts the area of the marker 8 from the converted black and white image (S23).

The dust 20 accumulated inside the frame 41 has a relatively low brightness compared to the demarcation of the steps, etc., so the judgment processing unit 52 of the self-propelled camera 1 compares the low brightness area indicating the amount of dust accumulated in the marker area with the judgment value of the marker 8 (S24). The judgment processing unit 52 then determines whether the low brightness area is equal to or lower than the judgment value of the marker 8 (S25).

In step S25, if the low brightness area is equal to or less than the judgment value 21 of the marker 8 (Yes in S25), the worker 40 determines that the judgment result is good (OK) and that cleaning inside the frame body is not necessary at the present stage (S26). In addition, if the low brightness area exceeds the judgment value 21 of the marker 8 in step S25 (No in S25), the worker 40 determines that the judgment result is not good (NG) and that cleaning inside the frame body is necessary (S27).
Then, the self-propelled camera 1 repeats the above process from the upper horizontal section to the inclined section, from the inclined section to the lower horizontal section, and up to the work management section, and ends the process (S28).

Next, the procedure of the mapping process of dust accumulation locations in the passenger conveyor inspection device of this embodiment described with reference to FIG. 6 will be described with reference to the flow chart of FIG.
Steps S30 to S32 are the same processes as steps S20 to S22 in FIG. 9, so a duplicated description will be omitted here.
When the processing of steps S30 to S32 is completed, the determination processing unit 52 of the self-propelled camera 1
Areas with high luminance from the upper part of the converted black-and-white image are extracted as step demarcations (S33), and the determination processing unit 52 counts the number of step demarcations (S34).

Since the dimensions of the steps are known, the determination processing unit 52 calculates the running position of the self-propelled camera 1 based on the number of steps counted in step S34 (S35). The determination processing unit 52 then links the calculated running position of the self-propelled camera 1 to the amount of dust accumulation and stores it in the storage unit 53 (S36). The worker 40 repeats the above work across the upper horizontal section, inclined section, and lower horizontal section of the frame until the work is completed (S37). Then, as shown in the upper diagram of Figure 6, the dust accumulation areas are mapped on the illustration of the escalator and displayed on the display unit 60a of the control terminal 2 (S38). This concludes the mapping process of dust accumulation areas in the passenger conveyor inspection device.

Second embodiment of the present invention
Figure 11 shows the structure of a self-propelled camera 1, which is a passenger conveyor inspection device according to a second embodiment of the present invention, in a plan view 1a, a front view 1b, and a side view 1c. The difference from the first embodiment shown in Figure 1 is that a marker/russel 70 is used instead of the marker 8 in Figure 1. Other than that, the structure of the self-propelled camera 1 is the same as that of the first embodiment shown in Figures 1 and 2, so a description thereof will be omitted.

That is, as shown in the plan view 1a of FIG. 11, the marker/russel 70 is made of a transparent material and has a russel shape that can push aside the dust 20 and move it to both the left and right sides from the direction of travel. Also, as shown in the front view 1b, the marker/russel 70 has a line 21a formed thereon that indicates a judgment value for measuring the amount of accumulated dust 20. The marker indicating the judgment value may be built into the camera 6.

On the display screen 22a of the control terminal 2, a line 21a indicating the judgment value for judging the dust 20 and the dust accumulation amount is displayed as an image from the camera 6, and in the example of Figure 11, the dust 20 accumulation amount is shown as being currently below the judgment value 21a.

In the second embodiment described above, there is no need to provide a marker arm 16 for extending the marker 8, as in the self-propelled camera 1 of the first embodiment, and therefore no need for a control function for extending and contracting the marker arm 16.

Although the embodiment of the passenger conveyor inspection device of the present invention has been described above using an escalator as an example, the present invention is not limited to escalators. The passenger conveyor inspection device of the present invention can also be used as an inspection device for a higher passenger conveyor such as a moving walkway.
Furthermore, the above-described embodiment examples are intended to explain the present invention in an easily understandable manner, and the present invention is not necessarily limited to having all of the configurations described. The present invention can be applied to other configurations as appropriate, as long as it does not deviate from the scope of the claims.

1...self-propelled camera with communication function, 2...control terminal (mobile terminal), 3...lifeline/communication cable, 4...endless tracks, 4a...driving wheels, 4b, 4c...driven wheels, 5...dust cover, 6...camera. 7...light source, 8...marker (index), 9...housing, 10...driving device, 11...control panel, 12...power source, 13...hinge, 14...communication device, 15...oil seal, 16...marker arm, 20...dust, 21...judgment value (threshold), 22...display screen, 30...horizontal section, 31...break point section, 32...inclined section, 40...operator, 41...frame, 50...imaging section, 51...image processing section, 52...judgment processing section, 53, 64...storage section, 54, 61...control section, 55...driving section, 56, 63...power supply section, 57...viewing angle driving section, 58...incline detection section, 59, 62...communication section, 60...operation display section, 60a...display section, 60b...input section, 70...marker/Russell

Claims (6)

A housing whose length in a traveling direction is shorter than its length in a direction perpendicular to the traveling direction;
A caterpillar track having three pairs of wheels provided on the housing to enable the housing to move;
A camera provided in the housing;
An index for determining the amount of dust present within the frame based on the image captured by the camera; and
A control unit that controls the movement of the housing;
A passenger conveyor inspection device comprising: 2. The passenger conveyor inspection device according to claim 1, wherein the indicator is attached to a telescopic arm, and the amount of accumulated dust is determined by bringing the arm close to the dust inside the frame. 2. The passenger conveyor inspection device according to claim 1, wherein the indicator is marked on a transparent Russell-shaped plate disposed in front of the camera, and the camera captures an image of the indicator and the dust to determine the amount of dust accumulation. The housing is divided into a front part and a rear part in the forward and rear directions of the traveling direction,
The passenger conveyor inspection device according to any one of claims 1 to 3, wherein the front portion and the rear portion are connected by a hinge. The control unit is connected to a control terminal wirelessly or via a wire,
5. The passenger conveyor inspection device according to claim 4, wherein the control unit receives instructions from the control terminal to control movement of the housing within the frame body, and transmits an image of the inside of the frame body including the dust and the indicator captured by the camera to the control terminal. and a tilt detection unit that detects when the control unit receives an instruction from the control terminal, moves the housing forward, and a front portion of the housing enters a tilted portion within the frame body, and the front portion of the housing forms an angle equal to or greater than a predetermined angle with a rear portion of the housing,
The tilt detection unit notifies the control unit of an intrusion of the housing onto the tilt portion,
The passenger conveyor inspection device according to claim 5 , wherein the control unit receives a notification of an intrusion onto the inclined portion from the inclination detection unit and controls the housing to temporarily stop.

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