JPH10100029A - Connection/disconnection indicating device for trucks to be multiply connected in work line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stop an AGV for carrying a truck to a work line at a predetermined work station and to indicate the truck to be disconnected to an operator of the work station. SOLUTION: A carrying AGV 5 has a work ID57 for recording information of parts like kinds of parts loaded on each truck 4. A CPU process panel 2 is provided this side of a work line 1 of an introduction path 3 and a work control CPU 2a selects work stations 1a, 1b, 1c for disconnecting each of the trucks on the basis of part information of the work ID57. Address data of each selected work station and distinguishing information of the truck to be disconnected at each work station are transmitted to a controller for controlling the action of the carrying AGV 5 by a radio communication device 22 to light a large display lamp 46a of the truck corresponding to the distinguishing information at each work station.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic guided vehicle (Au) which is disposed on a work line of an assembly factory or the like and has components mounted thereon.
to-Guide Vehicle (hereinafter simply referred to as AGV) selects a loaded truck carrying necessary parts from a plurality of loaded trucks transported by AGV, and disconnects the truck from workers on the work line. The present invention relates to a device for instructing the detachment of a multi-connection truck in a work line for instructing.

[0002]

2. Description of the Related Art Conventionally, in order to transport parts to a work line in an assembly factory, generally, a plurality of mounted trolleys loaded with parts at a parts supply station are connected in a row to an electrically conductive tractor, and a transport operator generally performs this operation. It is carried out by driving a conductive towing vehicle and transporting the mounted truck to a work line. In this case, in the component supply station, the types of components required in each of the plurality of work stations provided on the work line corresponding to the plurality of work processes are pre-sorted and mounted on each carriage, Further, in the above-mentioned work line, the transport worker stops the electrically conductive tower at each work station where the mounted trolley should be separated, and then the worker of the work station follows the instruction of the above-mentioned transport worker. A predetermined mounted trolley corresponding to the work station is separated.

[0003]

By the way, in order to automate the transfer of parts to such a work line and to reduce the manufacturing cost, the vehicle runs along a taxiway laid on the floor of a factory. It is conceivable to use an AGV (for example, see JP-A-6-208415). However,
In the case of transporting a plurality of loaded trolleys using the AGV as described above, the worker of the work station is required to
After stopping the GV, the operator must select a vehicle equipped with the required types of parts at the work station from among the plurality of mounted trucks that the AGV has been pulling, which places a burden on the operator. Is too large,
There is also a risk that an erroneously mounted truck will be cut off due to this worker's inadvertent mistake. If an incorrectly mounted trolley is cut off at one work station, it will not only hinder the assembly work at this work station,
Other work stations that require parts mounted on the erroneously detached mounted carriage will also interfere with the assembling work, resulting in a significant delay in the assembling work.

The present invention has been made in view of such circumstances, and an object of the present invention is to stop an AGV that transports a mounted carriage to a work line at a predetermined work station, and perform the work. An object of the present invention is to make it possible to instruct a worker at a station of a mounted trolley to be cut off, thereby reliably preventing a wrong trolley from being cut off while reducing the burden on the worker.

[0005]

In order to achieve the above object, according to the present invention, there is provided a work line in which a plurality of work stations for performing work in each work process are sequentially arranged. A detachment / attachment device for a multi-connection truck in a work line for instructing a worker of a station on a loaded truck to be separated from a plurality of loaded trucks loaded with parts and transported by an automatic guided vehicle. It is assumed. In this apparatus, recording means provided on the automatic guided vehicle or a plurality of mounted vehicles and recording part information on the type or number of components mounted on each of the mounted vehicles, Station selection means disposed on the front side of the work line on the route, reading part information recorded in the recording means, and selecting a work station from which each of the mounted carts should be separated based on the part information; The position information of each work station selected by the station selection means and the identification information of the mounted trolley to be separated at each work station are transferred to the operation control means for controlling the operation of the automatic guided vehicle. Information transfer means, and at each work station where the automatic guided vehicle is stopped, a command from the operation control means is transmitted. Only to it is an arrangement and display means for displaying to the operator of the work station mounted already trolley corresponding to the identification information.

[0006] In the case of the above configuration, first, each work station from which each mounted trolley should be cut off is selected by the station selection means based on the component information recorded in the recording means. Subsequently, the position information of each work station selected by the station selection means and the identification information of the mounted trolley to be disconnected at each work station are transferred to the operation control means of the automatic guided vehicle by the information transfer means. Then, the automatic guided vehicle having received the transfer of the information stops at each work station in order based on the position information. For this reason, it becomes possible to automatically stop the automatic guided vehicle at a work station corresponding to the type or the number of parts mounted on each of the mounted trolleys. It is possible to reduce the burden on the worker by omitting it. At each work station where the automatic guided vehicle stops, the display unit receiving the instruction from the operation control unit displays the mounted cart corresponding to the identification information to each worker. The operator can easily and reliably detach the mounted cart required at the work station. Thus, it is possible to prevent a worker from erroneously cutting off the bogie and prevent a delay in assembling work while reducing the burden on the operator.

According to a second aspect of the present invention, in the station selecting means of the first aspect, the correspondence between the component information and the work station is input and set in advance, and the work station is selected according to the correspondence. It is assumed that.

In the case of the above configuration, the configuration of the station selecting means in the first aspect of the present invention is specified, and each mounted truck should be separated according to a preset correspondence between the component information and the work station. Each work station is selected based on the type or number of components mounted on each of the mounted trolleys. For this reason, it is possible to reliably select each work station corresponding to the parts or the number mounted on each mounted truck by the station selecting means.
The operation according to the described invention can be reliably obtained.

According to a third aspect of the present invention, the information transfer means according to the first aspect comprises a non-contact type communication means for transferring position information and identification information from the station selection means to the operation control means. Is what you do.

In the case of the above configuration, the configuration of the information transfer means according to the first aspect of the present invention is specified, and the unmanned transport is performed by the non-contact type communication means from the station selection means disposed on the front side of the work line. It is possible to reliably transfer the position information and the identification information to the operation control means of the vehicle. Thus, the operation according to the first aspect of the present invention can be reliably obtained.

According to a fourth aspect of the present invention, as the display means in the first aspect of the present invention, a display lamp is provided on each of the plurality of mounted trolleys and is turned on by a command from the operation control means of the automatic guided vehicle. Is provided.

In the case of the above construction, the construction of the display means according to the first aspect of the present invention is specifically specified, and in each work station where the automatic guided vehicle is stopped, each mounted station to be cut off at each work station. The indicator light of the trolley,
It is turned on in response to a command from the operation control means of the automatic guided vehicle. For this reason, it is possible to reliably display the mounted carts to be separated at the work station to the worker at each work station, whereby the operation according to the first aspect of the present invention is reliably obtained. It becomes possible.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example in which an apparatus for instructing the attachment and detachment of a multi-connection truck in a work line according to an embodiment of the present invention is applied to an assembly line 10 of an automobile assembly plant. Reference numeral 2 denotes a CPU process board for work management of the work line 1; 3 a guide path as a transport route laid between the picking zone where parts are supplied and the work line 1; .. Are carts for mounting components, and 5 is a transport AGV for towing these carts 4, 4,.

The work line 1 is provided with three work stations 1a, 1b, 1c provided corresponding to three different work processes, respectively. These work stations 1a, 1b, 1c are different from each other. Assembly work is performed using parts of types "a", "b", and "c".

The CPU process board 2 is disposed on the guide path 3 in front of the work line 1 and is provided with a transport AGV.
5, an interface device 21 for reading component information from a work ID 57 as a recording means, and work stations 1a, 1b, 1 for stopping the transport AGV 5.
work management C as station selecting means for selecting c
The PU2a, the position information of the work stations 1a, 1b, 1c selected by the work management CPU 2a and the identification information of the carts 4, 4,. And a wireless communication device 22 as a non-contact communication means for transferring the data to the wireless communication device. The interface device 21 has the work ID
57, the part information relating to the type of parts mounted on each of the mounted carriages 4, 4,... Carried by the carrying AGV 5 is read, and the part information is stored in the work management CPU 2a. And work station 1
Correspondences with a, 1b, and 1c are input and set in advance. Then, based on the component information read by the interface device 21, the work management CPU 2a operates the work stations 1a, 1b, 1c in accordance with the correspondence.
Is to be selected.

The guide path 3 is laid so as to circulate from a picking zone (not shown) constituted by a component supply station or the like for supplying components to the assembly line 10, and the components are mounted at the component supply station. Mounted carts 4, 4, ... and transport A connected to them
The GV 5 is guided to the assembly line 10. In the assembly line 10, the guide path 3 is disposed in parallel with the work line 1 at a predetermined interval, and the transport AGV 5 is moved along the work line 1 to each of the work stations 1a, 1b. , 1c in order. Also, along the route of the taxiway 3, C
At the positions corresponding to the PU process board 2 and the positions corresponding to the work stations 1a, 1b, 1c, the address plates 30 to 33 (30 shown in FIG.
The address plate 30 represents address data “80” described later, and the address plates 31 to 33 also represent address data “120” to “155”.

As shown in FIG. 2, the carts 4, 4,... Are formed in a rectangular plate shape and arranged horizontally.
1, mounting shelves 42, 42 disposed on the upper surface of the base 41 so as to open on both the left and right sides, and disposed at the four corners on the lower surface of the base 41, and , And a coupling ring 44 disposed on the front surface (the left side surface in FIG. 3) of the base portion 41.
And a connecting hook 45 disposed on the rear surface (the right side surface in the figure), and connects the front bogie 4 between the plurality of bogies 4, 4,. By engaging the hook 45 with the connection ring 44 of the rear bogie 4, the bogies 4, 4,... Are connected to each other. Each of the mounting shelves 42, 42 has a large number of storage frames 42a, 42 partitioned into a birdhouse.
are provided on the upper portion of the front surface of each of these storage frames 42a, storage frame indicators 42b, 42b, 42b, 42b, for indicating the storage positions of the components when the loading operation of the components is performed in the picking station. … Is arranged. Further, on the upper right side of the upper surface of each of the mounting shelves 42, there are provided display units 46, 46 each having a large display lamp 46a as a display means. An indicator light lighting circuit, comprising a communication circuit 46b receiving a command from the controller 56 by wireless communication, a CPU and an indicator light driving circuit, and receiving input from the communication circuit 46b and controlling lighting of the large indicator light 46a and the like. 46c
(See FIG. 3). Further, a pair of combining grooves 41a, 41a (see FIG. 5) for combining with the transport AGV 5 are formed on the bottom surface of the base portion 41.

As shown in FIG. 4, the transport AGV 5 includes a vehicle body 51 formed in a rectangular relatively thick plate shape,
The vehicle body 51 includes a pair of uniting pins 52, 52 disposed on an upper surface 51a of the vehicle body 51, and a driving unit 53 disposed on a lower surface 51b of the vehicle body 51 (see FIG. 6).
Sensors 54, 54 for tracking the vehicle, and address plates 30, 3 disposed on the floor along the path of the taxiway 3.
Address sensors 5 such as magnetic sensors for detecting 1,.
5, 55. Further, the AGV5 for transportation
Are the guide sensors 54, 54 and the address sensor 55,
A controller 56 (see FIG. 7) as an operation control means for controlling the operation of the transport AGV 5 in response to an input from the input unit 55 and the like, and types of components mounted on each of the mounted vehicles connected to the transport AV 5 And a work ID 57 in which component information such as The work ID 5
For example, a recording medium readable by magnetic or optical reading may be used as 7.

The pair of uniting pins 52, 52 are rotated around a horizontal axis by an electric motor (not shown), and are united at positions where they protrude vertically upward from the upper surface 51a of the vehicle body 51 (positions indicated by solid lines in FIG. 4). ) And a storage position (a position indicated by a phantom line in FIG. 4) stored inside the vehicle body 51, and as shown in FIG. In a state where the truck 4 is sunk under the floor, the combining pins 52, 52 at the combining position are fitted into the combining grooves 41a, 41a of the truck 4, respectively, so that the cart 4 and the AGV 5 for transport are combined. It has become so. As shown in FIG. 6, the drive unit 53 is rotatable around a vertical axis at a front end (upper side in the figure) and a rear end (lower side in the figure) of the lower surface 51b of the vehicle body 51, respectively. Drive wheels 53a, 53a arranged;
Driving wheels 53b, 53b are provided on both left and right sides so as to be pivotable about a vertical axis. The driving wheels 53a are driven to rotate by a driving motor 53c, so that the vehicle body 51 travels. Drive wheel 5
The vehicle body 51 runs in an arbitrary direction by turning the steering wheel 3a around a vertical axis by the steering motor 53d.

As shown in FIG. 6, the guide sensors 54 are disposed at the front end and the rear end of the lower surface 51b of the vehicle body 51, respectively, and detect the amount of deviation of the vehicle body 51 from the guideway 3 in the left-right direction. The detected deviation amount is input to the controller 56, and the address sensor 55 converts the address data “80” to “155” read from the address plates 30 to 33 provided on the floor surface into the above-described address data. The data is input to the controller 56.

As shown in FIG. 7, the controller 56 includes a control CPU 56a, a memory 56b for transferring data to and from the control CPU 56a,
Driving circuits 56c and 56d for controlling the driving force and driving direction of 3a and 53a are provided, and are configured to operate by receiving supply of electric power from a battery 56e. The control CPU 56a activates the steering motors 53d, 53d by the driving circuit 56d based on the deviation amount detection value input from the guide sensor 54, and drives the driving wheels 5d.
The directions of 3a and 53a are corrected. Further, the controller 56 receives the address data “80” to “120” input from the address sensor 55, and receives an operation command table stored in the memory 56b (see Table 1).
From the address data "80" to "120", and read the transport AGV according to the operation command.
5 is controlled, and a command is sent to the indicator light lighting circuit 46c of each mounted trolley 4 by the communication circuit 56f as communication means in accordance with the above operation command, and the large indicator light 46a of each mounted trolley is turned on. It has become. Here, as shown in Table 1, the address data “00” to “255” of each address plate disposed along the taxiway 3 are shown on the vertical axis, and the transport AGV 5
Are set on the horizontal axis.

[0023]

[Table 1]

Specifically, the controller 56 controls the operation of the CPU process panel 2 via the communication circuit 56f.
From the PU 2a, address data “120”, “13” as position information for stopping each of the mounted carts 4, 4,.
"1", "155" and the identification information "a", "b", "c" corresponding to these address data, and these address data "120", "131", "155" and the identification information. The operation instruction table is changed and stored according to "a", "b", and "c". Then, the controller 56
Is the address data “12” of the address plate 31 from the address sensor 55.
When "0" is input, a stop command, an indicator light turning-on command, and identification information "a" of the mounted trolley 4 are read from the operation command table, and the drive motors 56c, 53
c is stopped to stop the AGV 5 for conveyance, and at the same time, a command is sent by the communication circuit 56f to the indicator light lighting circuit 46c of the mounted trolley 4 corresponding to the identification information “a”, and The large display lamp 46a is turned on. In the figure, reference numeral 56g denotes an operation panel which receives an operation input by an operator.

Next, the operation of the detachment / instruction device for the multi-connection truck in the work line according to the above-described embodiment and the operation and effect thereof will be described.

First, the transport AGV 5 is composed of three mounted trolleys 4, 4, and 4 on which parts of different types "a", "b", and "c" corresponding to the work stations 1a, 1b, and 1c, respectively, are mounted. And arrives at the assembly line 10 (see FIG. 1), and the address sensor 55 reads the address data “80” from the address plate 30 (see FIG. 8) and stops. That is, address data "80" is input from the address sensor 55 to the controller 56, the control CPU 56a reads a stop command corresponding to the address data "80" from the operation command table, and the driving circuit 56c
By stopping 3c and 53c, AGV5
Is stopped. Subsequently, the work management CP of the CPU process board 2
U2a is the work ID of the transport AGV 5 in the stopped state.
The component information is read from the interface 57 by the interface device 21, and based on the component information, the work stations 1a, 1
b, 1c, the address data “12” of each of the selected work stations 1a, 1b, 1c is selected.
0, 131, and 155, and the identification information "a", "b", and "c" of each mounted truck 4 to be separated at each of these work stations 1a, 1b, and 1c. 22, the controller 5 of the transport AGV 5
Transfer to 6. The transport AGV that has received the address data and the identification information “a”, “b”, “c”
In the controller 56 of No. 5, the control CPU 56a makes these address data “120”, “131”, “155”
The operation instruction table is rewritten according to the identification information "a", "b", and "c", and the rewritten operation instruction table (see Table 1) is newly stored in the memory 56b.

Next, the transport AGV 5 is provided with a work management CV.
The vehicle restarts according to the command from the PU 2a, travels along the taxiway 3, reads the address data "120" from the address plate 31 at the work station 1a, and stops from the operation command table corresponding to the address data "120". After reading and stopping, the large indicator light of the last mounted trolley 4 (the upper trolley in FIG. 8) on which the component of the type "a" is loaded in accordance with the indicator light lighting instruction corresponding to the address data "120" as well. 46a is turned on. Then, the worker of the work station 1a operates the large indicator light 46a.
Is cut off and replaced with an empty trolley 4, and the operation panel 56g is used to transfer the trolley A.
A start command is input to the GV5 to restart the transport AGV5. At the time of detaching the mounted truck 4 described above, the large indicator light 46a of the last mounted truck 4 on which the component of the type "a" is mounted is turned on. The mounted trolley 4 to be separated can be definitely recognized, and the type “b” or the type “c”
It is possible to reliably prevent the mounted carts 4 and 4 on which the above components are mounted from being erroneously separated.

Subsequently, the transport AGV 5 travels along the guide path 3, reads out the address data "131" from the address plate 32 provided in the work station 1b, stops, and similarly operates in each work station 1b. , 1c, the loaded trucks 4, 4,... Are disconnected and then the empty trucks 4, 4,... Are connected, and these empty trucks 4, 4,.

According to the above-described embodiment, the work management CPU 2a selects the work stations 1a, 1b, 1c for separating the mounted carts 4 based on the component information recorded in the work ID 57, and Since the transport AGV 5 is automatically stopped at each of the selected stations 1a, 1b, 1c, the worker of each of the work stations 1a, 1b, 1c is required to transfer the transport AGV 5 to each of the work stations 1a, 1b, 1c. It is only necessary to separate the mounted carriage 4 after stopping at 1c, and there is no need to stop the transport AGV 5 at each of the work stations 1a, 1b, 1c. In addition, the above-mentioned worker stops the transport A
When the mounted truck 4 is separated from the GV5, the large indicator light 46
By lighting of a, the work stations 1a, 1b, 1
In step c, the mounted cart 4 on which the required type of component is mounted can be easily and definitely identified. For this reason,
In each of the work stations 1a, 1b, and 1c, it is possible to reliably prevent the erroneous mounted trolley 4 from being cut off, thereby preventing a delay in the assembly work in the work line 1.

<Other Embodiments> The present invention is not limited to the above embodiments, but includes various other embodiments. That is, in the above embodiment,
Although the work ID 57 is provided on the transport AGV 5, the invention is not limited to this. The work ID 57 may be provided on each truck 4 transported to the transport AGV 5, and parts are mounted on each of the trucks 4. Later on each of those mounted trolleys 4
May be placed on the device.

In the above embodiment, the work ID 57 that can be read by optical reading or the like is used as a recording medium. However, the present invention is not limited to this. The recording medium is made up of a semiconductor memory, and is controlled by the control CPU 56a of the AGV 5 for conveyance. The work management CPU 2a may read information recorded in the semiconductor memory via wireless communication between the controller 56 and the work management CPU 2a by reading and writing data to and from the semiconductor memory.

In the above-described embodiment, the type of the component mounted on each mounted trolley 4 is used as the component information. However, the present invention is not limited to this. For example, the number of the above-mentioned components may be used. Is also possible.

In the above embodiment, information is transferred from the work management CPU 2 to the transport AGV 5 by the wireless communication device 22. However, the present invention is not limited to this. When reading is performed, information may be transferred to the stopped transport AGV 5 by optical communication or the like.

In the above-described embodiment, the mounted trolley 4 to be disconnected is displayed by the large indicator light 46a provided on each trolley 4. However, the present invention is not limited to this. You may.

In the above-described embodiment, a low-floor type AGV that sunk under each carriage 4 and united with the carriage 4 is used as the transport AGV 5, but the invention is not limited to this. An AGV that pulls the bogie from behind may be used, or an AGV that drives the bogie from behind may be used.

[0036]

As described above, according to the apparatus for instructing the attachment / detachment of a multi-connection truck on a work line according to the first aspect of the present invention, an automatic guided vehicle is selected by a station selection unit based on component information of a recording unit. By automatically stopping at each of the work stations, the automatic guided vehicle can be automatically stopped at the work station corresponding to the type or the number of parts mounted on each of the mounted trolleys, thereby burdening the operator. Can be reduced. Further, at each of the above-mentioned work stations, the mounted carriage to be separated at each of these work stations is displayed to each worker by the display means, so that the mounted carriage can be easily and reliably separated from the worker. Thereby, while reducing the burden on the worker, it is possible to prevent the erroneous separation of the bogie and prevent the assembly work from being delayed.

According to the second aspect of the present invention, the correspondence between the type or the number of parts and the work stations is set in advance, so that each work station corresponding to the parts or the number mounted on each mounted truck is set. It can be selected reliably.

According to the third aspect of the invention, by using the non-contact type communication means, it is possible to reliably transfer the position information and the identification information from the station selection means to the operation control means of the automatic guided vehicle. .

According to the fourth aspect of the present invention, the indicator light of each mounted trolley to be cut off at each work station is turned on, so that the worker at each work station should be cut off at that work station. The mounted trolley can be reliably displayed.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a cart.

FIG. 3 is a block diagram showing a configuration of an indicator lamp lighting circuit of the bogie.

FIG. 4 is a perspective view illustrating a configuration of a transport AGV.

FIG. 5 is a side view showing a state in which the AGV for transportation and the cart are combined.

FIG. 6 is a bottom view of the transport AGV.

FIG. 7 is a block diagram illustrating a configuration of a controller of the transport AGV.

FIG. 8 is a diagram showing a state in which a mounted cart to be cut off is displayed to an operator by turning on a large indicator light.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Work line 1a, 1b, 1c Work station 2a Work management CPU (station selection means) 3 Guide route (transport route) of AGV for transport 4 Truck (mounted truck) 5 AGV for transport (automated guided vehicle) 22 Radio communication device (Communication means) 46a Large indicator light (display means) 56 Controller (operation control means) of transport AGV 46c Indicator light lighting circuit (lighting control means) 56f Communication circuit (communication means) of transport AGV 57 Work ID (recording means) )

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Oya 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (72) Tetsuya Nakamura 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. Inside

Claims (4)

[Claims] In a work line in which a plurality of work stations that perform work for each work process are sequentially arranged, parts are mounted on an operator of each work station and transported by an automatic guided vehicle. In a detachment / instruction device for a multi-connection truck in a work line for indicating a loaded truck to be separated from a plurality of loaded trucks, the device is provided on the unmanned carrier or the plurality of loaded trucks,
Recording means for recording component information relating to the type or number of components mounted on each of the mounted carts; and a recording means disposed on a front side of a work line in a transport route of the automatic guided vehicle and recorded on the recording means. Station selection means for selecting a work station from which each of the mounted trolleys should be separated based on this part information, and operation control means for controlling the operation of the automatic guided vehicle.
Information transfer means for transferring the position information of each work station selected by the station selection means and the identification information of the mounted trolley to be cut off at each work station; and each work station at which the automatic guided vehicle stops. Display means for receiving a command from the operation control means and displaying a mounted trolley corresponding to the identification information to a worker at each work station. Desorption instruction device. 2. The station selecting means according to claim 1, wherein the correspondence between the component information and the work station is input and set in advance, and the station selection means is configured to select the work station according to the correspondence. Instruction device for detaching / attaching a multi-connection cart in a work line. 3. The work line according to claim 1, wherein the information transfer means includes a non-contact communication means for transferring the position information and the identification information from the station selection means to the operation control means. Detachment / detachment instruction device for connecting cart 4. The display device according to claim 1, wherein the display means includes an indicator light arranged on each of the plurality of mounted vehicles and turned on by a command from the operation control means of the automatic guided vehicle. Instruction device for detaching / attaching a multi-connection trolley in a working line.