阅读说明：本技术 防盗装置以及发电机防盗系统 (Antitheft device and generator antitheft system ) 是由 土桥学 桥爪崇 松久哲也 久田亮太 于 2019-02-22 设计创作，主要内容包括：本发明的一个方面涉及一种防盗装置,其是和能够与作业机电连接的发电机有关的防盗装置,其特征在于,所述防盗装置具备：获取单元,其从多个发电机获取它们各自的位置信息；设定单元,其基于由所述获取单元获取到的所述位置信息将包含所述多个发电机的位置的单一的区域设定为可移动区域；以及报告单元,其在所述多个发电机中的至少一个移动至由所述设定单元设定的所述可移动区域外的情况下进行规定的报告,由此,能够比较简便地实现发电机的防盗。(One aspect of the present invention relates to an antitheft device relating to a generator electrically connectable to a working machine, the antitheft device including: an acquisition unit that acquires their respective position information from the plurality of generators; a setting unit that sets a single region including positions of the plurality of power generators as a movable region based on the position information acquired by the acquisition unit; and a reporting unit configured to perform a predetermined report when at least one of the plurality of power generators moves outside the movable area set by the setting unit, thereby enabling theft prevention of the power generator to be relatively easily achieved.)

1. An antitheft device relating to a generator electrically connectable to a working machine, characterized in that,

the antitheft device is provided with:

an acquisition unit that acquires their respective position information from the plurality of generators;

a setting unit that sets a single region including positions of the plurality of power generators as a movable region based on the position information acquired by the acquisition unit; and

and a reporting unit configured to perform a predetermined report when at least one of the plurality of power generators moves outside the movable area set by the setting unit.

2. The anti-theft device according to claim 1,

the antitheft device further includes a registration unit that registers, when a certain generator is in an operating state, the generator and other generators located within a first distance from the generator as the plurality of generators.

3. The anti-theft device according to claim 1,

the antitheft device further includes a registration unit that registers, when a certain generator is connected to the work machine, the generator and another generator located within a first distance from the generator and/or the work machine as the plurality of generators.

4. The anti-theft device according to claim 3,

the registration unit registers the plurality of generators in response to a situation in which the work machine connected to the certain generator becomes an operating state.

5. The anti-theft device according to any one of claims 2 to 4,

user information is preset in the plurality of generators,

the registering means registers the certain generator and the other generators set with the same user information as the generator as the plurality of generators.

6. The anti-theft device according to any one of claims 2 to 5,

the setting unit sets the movable region so as to envelop a plurality of regions within a second distance that is smaller than the first distance from positions of the plurality of power generators, respectively.

7. The anti-theft device according to any one of claims 1 to 6,

the report unit outputs a control signal for causing the generator to generate a warning sound to the generator in a case where the generator moves outside the movable area.

8. The anti-theft device according to any one of claims 1 to 7,

the report unit outputs a control signal for limiting operation of the generator to the generator when the generator moves outside the movable area.

9. A generator antitheft system comprising a plurality of generators electrically connectable to a working machine and an antitheft device configured to be able to communicate with each generator,

the antitheft device is provided with:

an acquisition unit that acquires their respective position information from the plurality of generators;

a setting unit that sets a single region including positions of the plurality of power generators as a movable region based on the position information acquired by the acquisition unit; and

and a reporting unit configured to perform a predetermined report when at least one of the plurality of power generators moves outside the movable area set by the setting unit.

Technical Field

The present invention relates generally to an anti-theft device associated with a generator.

Background

For example, a mobile generator is brought into a work site such as a construction site or a construction site, and the work machine is driven by using the generator (see patent document 1). In some cases, a plurality of such generators are brought in by the scale of the work, and these generators are left standing for a long time. Therefore, it is also considered that the generator is removed from the work site without authorization, that is, a theft occurs.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2003-254080

Disclosure of Invention

Problems to be solved by the invention

As a countermeasure against theft of the generator, a method may be considered in which an area in which the generator can be moved and transported is limited, and it is determined that theft has occurred when the generator is taken out of the area. However, since the generator is transported to another work site after completion of a predetermined work, it is complicated to set the above-described region for each work site, which may cause a reduction in work efficiency.

The invention aims to realize the anti-theft of a generator relatively simply.

Means for solving the problems

A first aspect of the present invention relates to an antitheft device relating to a generator electrically connectable to a working machine, the antitheft device including: an acquisition unit that acquires their respective position information from the plurality of generators; a setting unit that sets a single region including positions of the plurality of power generators as a movable region based on the position information acquired by the acquisition unit; and a reporting unit configured to perform a predetermined report when at least one of the plurality of power generators moves outside the movable area set by the setting unit.

Effects of the invention

According to the invention, the anti-theft of the generator can be realized relatively simply.

Drawings

Fig. 1 is a schematic diagram for explaining an example of a work site.

Fig. 2 is a block diagram for explaining a configuration example of the antitheft system.

Fig. 3 is a flowchart for explaining an example of the operation content of the antitheft device.

Fig. 4 is a schematic diagram for explaining a mode of a certain step for setting the movable region.

Fig. 5 is a schematic diagram for explaining a mode of a certain step for setting the movable region.

Fig. 6 is a schematic diagram for explaining a mode of a certain step for setting the movable region.

Fig. 7 is a block diagram for explaining an example of the structure of the generator.

Fig. 8 is a flowchart for explaining an example of the operation content of the generator.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that each drawing is a schematic diagram showing the structure or configuration of the embodiment, and the illustrated dimensions do not necessarily reflect actual dimensions. In the drawings, the same elements are denoted by the same reference numerals, and redundant description thereof is omitted in the present specification.

Fig. 1 is a schematic diagram for explaining an example of a work site such as a construction site and a construction site. In ground research, foundation works, and the like at work sites, a work machine that can be operated by receiving electric power from an external power supply is used in addition to heavy machinery (construction machinery such as a hydraulic excavator) that can be operated by only the work machine. Examples of such a working machine include relatively small or medium-sized electric tools such as an electric drill and an electric saw. Other examples of the auxiliary work include a vibrator for preventing the generation of air bubbles in concrete, a concrete mixer, a lighting fixture for performing night work, a heater for heating, and the like. In many cases, work is performed in an environment where power sources are not available at a work site, and therefore, when a work machine as described above is used, a separate generator is further provided and the work is performed using the power.

As shown in fig. 1, a plurality of generators 11 and working machines 12 are brought into a working area RW of a work site. The generator 11 is brought into a plurality for preparation/replacement (to be able to sufficiently supply electric power). Each generator 11 is configured to be electrically connectable to work implement 12 via a predetermined cable (or wire) 13, and to be able to supply electric power to work implement 12 by the realization of the electrical connection. In the drawings, a single work implement 12 is shown for convenience of explanation, but two or more work implements 12 may be provided. The operator 14 operates the working machine 12 connected to the generator 11, and performs a predetermined operation using the working machine 12.

However, the operation takes a relatively long time (for example, half a day to several days or more), depending on the scale of the operation. In such a work site, the generator 11 may be left standing for a long time, and therefore, a loss due to theft may be considered. An antitheft device and a system thereof for realizing such antitheft with respect to the generator 11 will be described below.

(first embodiment)

Fig. 2 is a block diagram for explaining an example of the configuration of the generator 11 and the antitheft system SY according to the first embodiment. Although a configuration example related to one of the plurality of generators 11 is shown here, the other generators 11 are also the same.

The generator 11 includes an internal combustion engine 111, a power generation section 112, an output section 113, a sensor section 114, a control section 115, and an external communication interface 116. The internal combustion engine 111 is put into operation by receiving a start assist by a starter (not shown) and generates power. The power generation unit 112 generates electric power based on the power of the internal combustion engine 111. Output unit 113 can output the electric power of power generation unit 112 to the outside, and in the present embodiment, supplies electric power to work implement 12 connected via cable 13 (see fig. 1). The sensor unit 114 includes a position sensor for acquiring information indicating the position of the vehicle, such as a GPS (global positioning system) sensor, for example, and details thereof will be described later.

The control unit 115 can realize the function of the generator 11 by controlling the driving of each element in the generator 11. The control unit 115 can also communicate signals with the outside via the external communication interface 116, and details thereof will be described later. The control unit 115 may be a semiconductor device such as an ASIC (application specific integrated circuit), or may be a CPU (central processing unit) and a memory, that is, the function of the control unit 115 may be realized by either hardware or software.

The antitheft device 2 is a device for preventing theft of the plurality of power generators 11, and in the present embodiment, is a server including a Central Processing Unit (CPU)21, a memory 22, and an external communication interface 23. The antitheft device 2 is provided separately from at least the generator 11, and may be provided, for example, in a temporary office near a work site or in an office of a company under contract. With such a configuration, the generator 11 and the antitheft device 2 can communicate with each other via a predetermined network, thereby forming a generator antitheft system (or simply, an antitheft system) SY.

Fig. 3 is a flow chart for explaining the operation contents or the processing contents of the theft preventing device 2 in the above system SY. The steps described herein are executed mainly by the CPU21 and the memory 22 in the antitheft device 2. The flowchart is typically started by an operation input by an operator at the work site, and can be started, for example, by completing initial settings related to the antitheft device 2 and the plurality of generators 11 (for example, settings related to communication between the generators 11 and the antitheft device 2).

First, in step S1010 (hereinafter, simply referred to as "S1010". the same applies to other steps), it is determined whether or not information indicating that a job has already been started (hereinafter, referred to as job start information) is received. For example, when any one of the plurality of generators 11 is in an operating state, the operation start information is transmitted from the generator 11 in the operating state to the antitheft device 2. As another example, when any one of the plurality of generators 11 is connected to work implement 12, the work start information may be transmitted from the connected generator 11 to antitheft device 2. As another example, when any one of the plurality of generators 11 is connected to work implement 12 and work implement 12 is in an operating state, the work start information may be transmitted from the connected generator 11 to antitheft device 2. If the antitheft device 2 receives the job start information, the process proceeds to S1020, and if not, the process returns to S1010.

In S1020, position information of each of the plurality of power generators 11 is acquired. This step is realized, for example, by the antitheft device 2 requesting the position information from each generator 11 and each generator 11 receiving the request transmitting the position information obtained by the sensor unit 114 to the antitheft device 2. As another example, this step may be implemented by each generator 11 periodically transmitting position information to the antitheft device 2.

In S1030, a single area including the positions of the plurality of generators 11 is set as a movable area based on the position information of the generators 11 obtained in S1020, which will be described later in detail. In S1040, position information is acquired from each of the plurality of power generators 11 in the same procedure as in S1020. In S1050, the position information obtained in S1040 is compared with the movable region set in S1030.

In S1060, whether or not theft has occurred with respect to the plurality of generators 11 is determined based on the comparison result in S1050. Specifically, the antitheft device 2 determines whether any one of the plurality of generators 11 has moved outside the movable area. If any of the generators 11 moves outside the movable area, the generator 11 is assumed to be taken out without authorization (theft has occurred) and the process proceeds to S1070, otherwise, the process proceeds to S1080.

In S1070, a predetermined report is made based on the determination result (occurrence of theft) in S1060. Typical examples of the reporting method include sending a notice (e.g., mail) indicating that a theft has occurred to a portable terminal of a predetermined user (a manager, an operator, etc. at a work site), generating a warning sound, and the like. This enables the user to quickly confirm the situation of the work site.

In S1080, it is determined whether or not the job is in a continued state, and if the job is continued, the flow returns to S1040, otherwise (if the job is completed), the flowchart is ended. As mentioned above, the duration of the operation may be generally long. Therefore, in the present embodiment, the determination of S1080 is made based on the fact that the user has made an operation input to the antitheft device 2 indicating that the job is completed, and when the operation input is not made, the job is considered to be in a continuous state although a temporary rest time or the like may be set.

If the theft does not occur and the operation continues, the process returns from S1060 to S1040 through S1080, but the one-cycle of S1040, S1050, S1060, and S1080 may be performed at a predetermined cycle, for example, every few seconds, every few minutes, or the like. In other words, S1040 (acquisition of position information) may be performed at a predetermined cycle.

The above steps are mainly realized by the CPU21 executing a predetermined program in the antitheft device 2, but may be realized by a semiconductor device such as an ASIC as another embodiment. That is, the functions of the antitheft device 2 described in the present specification can be realized by either hardware or software. The antitheft device 2 is a device mainly aiming at an antitheft function relating to the generator 11, but may be a device having the function as an auxiliary device.

As a result, the antitheft device 2 responds to the reception of the work start information (S1020), and sets the movable regions of the plurality of generators 11 based on the position information thereof (S1030). After that, the antitheft device 2 acquires the position information of the plurality of generators 11 at predetermined intervals (S1040). When any one (at least one) of the generators 11 moves out of the movable area, the antitheft device 2 determines that the theft of the generator 11 has occurred (S1050 to S1060), and performs a predetermined report (S1070).

In performing the above steps, the existing map information may be referred to, and for example, the position information of the plurality of power generators 11 and the movable area may be associated with the map information. This is advantageous in facilitating the setting of the movable area and, in the event of a theft, the identification of the generator 11 to be stolen.

The movable region may be updated in response to the establishment of some condition after one setting, and for example, the process may return to S1020 when it is determined in S1080 that the job is continued. Examples of the update condition include a case where a predetermined time has elapsed, a case where a part of the items of the job have been completed, and the like.

Further, as described above, the movable region is set based on the position information of the plurality of power generators 11. However, the manner in which each of the plurality of generators 11 is arranged in the work area RW is arbitrarily determined by the user. Therefore, in S1030, it is required that the movable region can be appropriately set regardless of the arrangement of the generators 11. S1030, which can achieve this, is roughly divided into three steps. These three steps will be described below with reference to fig. 4 to 6, respectively.

In the step of fig. 4, any one of the plurality of generators 11 is identified (for distinction, "generator 11 a"), and thereafter, another generator 11 having a high correlation with the generator is further identified. These identified generators 11a and the generator 11 are registered in the antitheft device 2 (for example, the memory 22) as objects to be protected from theft.

The generator 11a is, for example, one of the plurality of generators 11 that is the trigger for starting the operation, and in the present embodiment, it is preferable to select the generator 11a as the source of the operation start information in S1010. For example, when one of the plurality of generators 11 is in an operating state, when one of the plurality of generators 11 is connected to the working machine 12, or when the working machine 12 is in an operating state, the generator 11 can be set as the generator 11 a.

With the thus determined generator 11a as a starting point or reference, another generator 11 having a high correlation with the generator is further determined. Whether the relevance is high can be determined based on the distance from the generator 11 a. Therefore, for example, the other generators 11 in the region R1 distant from the generator 11a by L1 may be determined as highly-related generators. The distance L1 may be set to a value larger than at least the width of the work area RW in plan view (the width that is the maximum value). Alternatively/additionally, as another embodiment, another generator 11 within a distance L1 from work machine 12 connected to generator 11a may be determined as a highly-related generator.

The generator 11 and the generator 11a identified as described above are registered in the antitheft device 2 as devices used in the work area RW, respectively, and are protected from theft.

In the step of fig. 5, a region R2 is set at a distance L2 from each of the generator 11 and the generator 11 a. The distance L2 may be set to any value as long as it is set in advance, and may be set to a value smaller than the distance L1. For example, the distance L2 may be set to a value equal to or less than the distance L1 (e.g., about 0.4 to 0.6 times) although it depends on the shape of the work area RW. The value of the distance L2 may be set by the user based on the map information, or may be set based on the result of classification of the work area RW by the antitheft device 2 (for example, based on the type of pattern matching). As another embodiment, a region R2 may be set for work implement 12 connected to generator 11a instead of or in addition to region R2 related to generator 11 a.

In the step of fig. 6, a single region enveloping the plurality of regions R2 set as described above is set as the movable region (referred to as "region RP"). That is, the movable region RP is set to be in contact with all of the plurality of regions R2. In order to facilitate setting of the movable region RP, both the region R2 and the region RP may be substantially circular in plan view.

The step S1030 for setting the movable region RP is roughly divided into three steps as described with reference to fig. 4 to 6. First, in the step of fig. 4, the generator 11 within the distance L1 (within the region R1) from the generator 11a that becomes the trigger for the start of the work is specified. Next, in the step of fig. 5, a region R2 distant from the determined generator 11 and generator 11a by a distance L2 is determined. Thereafter, in the step of fig. 6, a single region enveloping all of the region R2 is set as the movable region RP.

According to the procedure described above, the movable areas RP relating to the plurality of power generators 11 can be set appropriately and used in S1050 (comparison of position information) and S1060 (determination of presence or absence of theft) later. In many cases, a company under contract may have more generators 11. However, according to the present embodiment, since the generator 11 having high relevance is specified in the step of fig. 4, it is also possible to prevent a situation in which the movable region RP is set based on the position information of the generator 11 that is not relevant.

According to the present embodiment, the antitheft device 2 sets a single region including the positions of the plurality of generators 11 as the movable region RP in S1030, based on the position information of the plurality of generators 11 acquired in S1020. Thereafter, while the operation is continued, the antitheft device 2 acquires the position information of each generator 11 at a predetermined cycle, for example (S1040), and performs a predetermined report when any one (at least one) of the plurality of generators 11 moves out of the movable region RP (S1050 to S1070). According to the present embodiment, for example, the movable region RP can be appropriately set without substantially increasing the burden on the operator, and theft of the generator can be relatively easily prevented. Moreover, the generator theft prevention system SY can be realized with a relatively simple configuration, and the above theft prevention can be realized at a relatively low cost.

(second embodiment)

Fig. 7 shows a structure of a generator 11 according to a second embodiment. The generator 11 may further have a plurality of functions, and in the present embodiment, the generator 11 further includes an information holding unit 117, a function restricting unit 1181, and a sound generating unit 1182.

The information holding unit 117 holds information for the user to specify the power generator 11 as the device of the user as user information, and examples thereof include belonging information and identification information indicating an owner and a company. The user information is used in S1020 and S1040 (acquisition of location information). This can prevent, for example, an event in which an unrelated power generator (for example, another power generator belonging thereto) is to be protected from theft. In S1030, the movable region RP is not set based on the position information of the generator that is not related to the position information, and therefore the movable region RP can be set more appropriately.

The function restriction unit is configured to restrict the operation of the generator 11, and for example, maintain the internal combustion engine 111, the power generation unit 112, and/or the output unit 113 in a rest state using a predetermined disable signal or the like. For example, when the occurrence of a theft is detected in S1060, the antitheft device 2 outputs a control signal for limiting the operation of the generator 11 to be stolen. The function limiting unit 1181 limits the operation of the generator 11 based on the control signal. As a result, the generator 11 brought out of the movable region RP becomes inoperable, and theft of the generator 11 can be indirectly prevented.

The sound generator 1182 may be configured to generate a predetermined warning sound when the theft occurs, for example. For example, when the occurrence of a theft is detected in S1060, the antitheft device 2 outputs a control signal for causing the sound generator 1182 of the generator 11 to generate a warning sound to the generator 11 to be stolen. Thus, since the warning sound is generated from the generator 11 brought out to the outside of the movable region RP, the theft-related person can be directly warned to prevent the theft.

In the present embodiment, the configuration in which both the function restricting unit 1181 and the sound generating unit 1182 are provided is illustrated, but one of them may be omitted. The function limiter 1181 and/or the sound generator 1182 may be provided as a part of the controller 115.

Fig. 8 is a flowchart for explaining the operation contents of the generator 11 according to the present embodiment. The steps of the flowchart are mainly executed by the control unit 115. The generator 11 includes a normal mode and an alert mode as the operation mode. The normal mode is a state in which power can be supplied to work implement 12 when work implement 12 is connected, and power generator 11 can be disposed at an arbitrary position in work area RW while it is not being used for the supply of power. On the other hand, in the armed mode, the function limiter 1181 and the sound generator 1182 are both activated regardless of the position of the generator 11.

In S2010, the normal mode is set. Generator 11 set to the normal mode can be used for supplying electric power to work implement 12 thereafter, or can be arranged as a backup at an arbitrary position in work area RW.

In S2020, it is determined whether or not a warning signal indicating that the theft is determined to have occurred by the antitheft device 2 is received from the antitheft device 2. If it is determined in S1060 that a theft has occurred, the antitheft device 2 outputs the warning signal to the generator 11 to be stolen. The process proceeds to S2030 if the generator 11 receives the alert signal, and otherwise to S2040.

In S2030, the generator 11 is set to the alert mode and the function limiter 1181 and the sound generator 1182 are set to the active state in response to the receipt of the alert signal. This disables the generator 11, and a predetermined warning sound is generated from the generator 11.

In S2040, the generator 11 is kept in the normal mode because the warning signal is not received. At S2040, it is determined whether or not a request for transmitting position information to the antitheft device 2 has been received from the antitheft device 2. In the viewpoint of the antitheft device 2, the request corresponds to each of S1020 and S1040 (see fig. 3). S2050 is entered if there is reception of the request, otherwise S2060 is entered.

In S2050, the position information obtained by the sensor unit 114 is transmitted to the antitheft device 2 in response to the transmission request in S2040.

In S2060, it is determined whether or not the job is in a continued state, and if the job is continued, the flow returns to S2020, and if not (if the job is completed), the flowchart is ended. This step corresponds to S1080 (see fig. 3) in the viewpoint of the antitheft device 2.

According to the present embodiment, the same effects as those of the first embodiment described above can be obtained, and the theft prevention effect can be further improved.

(modification example)

In each of the above embodiments, the antitheft device 2 is provided as a server provided separately from at least the power generators 11, but the antitheft device 2 may be internally provided in part or all of the plurality of power generators 11. For example, when the antitheft device 2 is provided for each of the plurality of generators 11 (all of the plurality of generators 11), the plurality of generators 11 are configured to monitor each other for the presence or absence of theft.

(summary of the embodiment)

A first aspect relates to an antitheft device (e.g., 2) relating to a generator (e.g., 11) electrically connectable to a work machine (e.g., 12), the antitheft device comprising: an acquisition unit (e.g., 21, 22, S1020) that acquires their respective position information from a plurality of generators (e.g., 11); a setting unit (e.g., 21, 22, S1030) that sets a single region including positions of the plurality of generators as a movable region (e.g., RP) based on the position information acquired by the acquisition unit; and a reporting unit (e.g., 21, 22, S1070) that performs a predetermined report when at least one of the plurality of power generators moves outside the movable area set by the setting unit.

According to the first aspect, theft of the power generators can be prevented relatively easily by setting the movable areas of the plurality of power generators based on the position information of the power generators.

In a second aspect, the antitheft device further includes registration means (e.g., 21, 22) for registering, as the plurality of generators, a certain generator (e.g., 11a) and another generator (e.g., 11) located within a first distance (e.g., L1) from the generator when the generator is in an operating state.

According to the second aspect, the movable area can be set when a substantial start of a work is initiated.

In a third aspect, the antitheft device further includes registration means (e.g., 21, 22) for registering, as the plurality of generators, a generator (e.g., 11a) and another generator (e.g., 11) located within a first distance (e.g., L1) from the generator and/or the work machine when the generator is connected to the work machine (e.g., 12).

This can provide the same effects as those of the second embodiment.

In a fourth aspect, the registration unit registers the plurality of generators in response to the work machine connected to the certain generator becoming in an operating state.

This can provide the same effects as those of the second to third embodiments.

In a fifth aspect, the plurality of power generators are preset with subscriber information, and the registration means registers the certain power generator and another power generator set with the same subscriber information as the power generator as the plurality of power generators.

This prevents an irrelevant generator from being mistakenly protected from theft.

In a sixth aspect, the setting unit sets the movable region so as to envelop a plurality of regions (e.g., R2) within a second distance (e.g., L2) that is smaller than the first distance from the positions of the plurality of generators, respectively.

Thus, the movable area can be set appropriately for any generator in the work site.

In a seventh aspect, the reporting unit outputs a control signal to the generator to cause the generator to generate a warning sound when the generator moves outside the movable area.

According to the seventh aspect, the theft of the generator is prevented by the warning sound.

In an eighth aspect, the reporting unit outputs a control signal for limiting the operation of the generator to the generator when the generator moves out of the movable area.

According to the eighth aspect, theft of the generator is prevented by restricting operation of the generator in a place remote from the work site.

A ninth aspect relates to a generator theft prevention system (for example, SY) including a plurality of generators (for example, 11) electrically connectable to a working machine (for example, 12), and a theft prevention device (for example, 2) configured to be communicable with each of the generators, the generator theft prevention system including: an acquisition unit (e.g., 21, 22, S1020) that acquires their respective position information from the plurality of generators; a setting unit (e.g., 21, 22, S1030) that sets a single region including positions of the plurality of generators as a movable region (e.g., RP) based on the position information acquired by the acquisition unit; and a reporting unit (e.g., 21, 22, S1070) that performs a predetermined report when at least one of the plurality of power generators moves outside the movable area set by the setting unit.

This can provide the same effect as in the first embodiment.

The present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the spirit and scope of the present invention. Accordingly, for the purpose of disclosing the scope of the invention, the following claims are appended.