JPH0736978B2 - Item specification management device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention provides mobile communication devices attached to a plurality of articles and specification information of the articles transmitted from these mobile communication apparatuses via electromagnetic waves. The present invention relates to an article specification management device including a fixed communication device for reading.

[Conventional technology]

As a conventional article specification management apparatus, for example, there is an apparatus as shown in FIG.

Reference numeral 10 is a mobile communication device attached to each predetermined position on the vehicle body of the automobile manufacturing line. Reference numeral 2 denotes an antenna unit that receives a read command RC that arrives from a fixed communication device 1 to be described later via an electromagnetic wave of a predetermined frequency, and 3 amplifies a weak read command RC that is received by the antenna unit 2, and outputs the amplified signal. An AD conversion circuit 4 for detecting and AD-converting is a decoder for decoding whether or not the read command RC is present in the digital signal from the AD conversion circuit 3. When the decoder 4 decodes the read command RC in the digital signal, the decoder 4 outputs the read signal R to the memory operation circuit 5 described later.
Reference numeral 6 is a RAM in which specification information SD (model, standard, serial number, production history, etc.) peculiar to the vehicle body is stored in advance. When the memory operation circuit 5 receives the read signal R from the decoder 4, the RAM 6
Read the above-mentioned specification information SD peculiar to the vehicle from
SD is output to the DA conversion circuit 7 described later. Reference numeral 7 denotes the DA conversion circuit, which DA-converts the specification information SD peculiar to the vehicle body which is a digital signal from the memory operation circuit 5 and uses a high frequency signal of a predetermined frequency f to
Modulation is performed by the M method, and the modulated signal SD1 is transmitted via the antenna unit 2.

On the other hand, 1 is a fixed communication device, which is installed in each work station of the manufacturing line, and is modulated in response to the read command RC, which includes specification information SD peculiar to the vehicle body coming from the mobile communication device 1 via electromagnetic waves. The signal SD1 is received, and a work command at each work station is output to a robot or the like (not shown) based on the specification information SD included in the modulated signal SD1.

[Problems to be Solved by the Invention]

However, in such a conventional article specification management device, since the specification information of the article is transmitted from the mobile communication device via the electromagnetic wave of a single frequency, the article to which the mobile communication device is attached is attached. If the fixed communication devices cannot help but come close to each other, there is a problem that the fixed communication devices cannot separately receive the specification information coming from the respective mobile communication devices at the same time. Therefore, as proposed by the inventor of the present application, an invention in which the frequencies of electromagnetic waves transmitted by a mobile communication device are set to different frequencies (Japanese Patent Application No. 61-18782).
It is possible to adopt 9).

However, even if the present invention is used, the frequency band that can be used is finite. Therefore, as the number of articles to be managed increases, there may be a case where the same frequency must be used redundantly. Can not be completely resolved.

The present invention has been made in view of such a problem, and when the articles come close to each other, even if the same frequency is used in duplicate, the specification information of each article can be received separately. It is an object to provide a specification management device.

[Means for Solving the Problems]

Then, the configuration of the article specification management device according to the present invention to achieve this object is such that the specification information (SD) peculiar to the article is stored together with the article that moves along the manufacturing line, and the specification is specified at a single frequency. A mobile communication device (30) that wirelessly communicates information (SD) and a higher-level device that manages the article is connected to the mobile communication device (30) and placed at a predetermined position on the manufacturing line. A plurality of mobile communication devices (30, 30, ..., 30) that are equipped with a fixed communication device (20) that automatically reads the item-specific specification information (SD) and that communicate with the same frequency are attached. In an article specification management device in a production line for loading articles, in each of the mobile communication devices (30), storage means (31) in which the item-specific specification information (SD) is stored in advance, and the fixed communication device. (20) Read command (RC), and other mobile communication devices (30, ..., 30) including specification information (SD) from,
Reception means (32) for receiving a communication signal from another communication device and AD-converting the received communication signal into a digital signal
And whether the read command (RC) is present in the digital signal input from the receiving means (32), and if the read command (RC) is present in the digital signal, the read command (RC) is read. Confirmation means (33) for outputting RC) to the following delay means (35) and a stop signal (SP) for stopping the operation of the following detection means (34) for a predetermined time, and the confirmation means (33) When the stop signal (SP) is input from the means (33), the operation is stopped for the predetermined time, and after the predetermined time has elapsed or when the stop signal (SP) is not input, the receiving means (32) It is identified whether the digital signal from is the specification information (SD), and if it is the specification information (SD), the detection means (34) that continuously outputs the operation stop signal (SP1) while receiving the specification information. And an operation stop signal (SP1 ) Is input, the operation is stopped, and the above operation stop signal (SP1)
When the input of is completed or there is no input, the read instruction signal (Rl) generated based on the read command (RC) from the confirmation means (33) is randomly determined after the input of the read command (RC). After delaying for a predetermined time, if the delay means (35) outputting to the reading means (36) below and the operation stop signal (SP1) from the detecting means (34) are input, the operation is stopped. , Also, the above operation stop signal (SP
When the input of 1) is completed or there is no input, the specification information (SD) specific to the own article is stored from the storage means (31) based on the instruction of the read instruction signal (Rl) from the delay means (35). A reading means (36) for reading and a transmitting means (37) for DA-converting the specification information (SD) unique to the own article read by the reading means (36) into an analog signal of a predetermined frequency and wirelessly transmitting the analog signal. It is characterized by that.

In this case, the delay means (35) does not receive the operation stop signal (SP1), and the confirmation means (33).
When a read command (RC) is input from the device, the built-in random number generation circuit is activated to delay for a predetermined time specified based on the generated random number, and then the read instruction signal is sent to the read means (36). It is desirable to output (Rl) so that the reading means (36) reads the specification information (SD) specific to the own article from the storage means (31).

[Action]

Next, the operation of the present invention will be described based on the claim correspondence diagram shown in FIG.

When the mobile communication device (30) communicates with the fixed communication device (20), the storage means (31) first stores the article-specific specification information (SD).
Is stored in advance.

When the receiving means (32) of the mobile communication device (30) receives the read command (RC) from the fixed communication device (20), the receiving means (32) converts the received signal into a digital signal and transmits it.
The confirmation means (33) that has input this digital signal uses, for example, a method of checking whether the received signal is a communication signal including the read command (RC) from the signal identification code provided at the beginning of the digital signal. Whether or not the read command (RC) is present in the digital signal is identified, and if the read command (RC) is present in the digital signal as a result, the read command (RC) is output to the delay means (35). At the same time, a stop signal (SP) is output to the detection means (34).

In the detection means (34), when the stop signal (SP) from the confirmation means (33) is input, the operation is stopped for a predetermined time,
Also, after a lapse of a predetermined time or when the stop signal (SP) is not input, it is identified whether the digital signal input from the receiving means (32) is the specification information (SD), and the result is the specification information (SD). If so, the operation stop signal (SP1) is output while receiving the specification information (SD).

The delay means (35) outputs the operation stop signal (SP) from the detection means (34).
When 1) is input, the operation is stopped, the operation stop signal (SP1) is not input from the detection means (34), and the read command (RC) is input from the confirmation means (33). In some cases, the read instruction signal (Rl) generated based on the read instruction (RC) from the confirmation means (33) is delayed by a predetermined time randomly specified after the input of the read instruction, and then the read means (36). ) Is output.

The reading means (36) stops the operation when the operation stop signal (SP1) from the detection means (34) is input, and the operation stop signal (SP1) is not input from the detection means (34). When the read instruction signal (Rl) is input from the delay means (35), the storage means (3) is based on the read instruction signal (Rl).
Read the specification information (SD) unique to your product from 3).

The transmitting means (37) converts the specification information (SD) unique to the own article read by the reading means (36) into an analog signal of a predetermined frequency.
The data is converted and wirelessly communicated with the fixed communication device (20).

In this case, the delay means (35) activates the built-in random number generation circuit when the operation stop signal (SP1) is not input and the read command (RC) is input from the confirmation means (33), A delay operation is performed for a predetermined time specified based on a randomly selected value (random number), and then a read instruction signal (Rl) is output, and a read means (36) stores the storage means (3).
Read the specification information (SD) unique to your product from 1).

〔Example〕

Hereinafter, an embodiment of the present invention will be described by taking an automobile production line as an example.

The basic structure of an automobile manufacturing line is as shown in FIG. Reference numeral 11 is a conveyor which is driven in the direction of the arrow by a motor (not shown). 12, 12a, 12b are vehicle bodies corresponding to articles, and the vehicle bodies 12, 12a, 12b are placed on the conveyor 11 at substantially equal intervals in consideration of production efficiency, and are placed and conveyed in a close state. There is. Further, mobile communication devices 30, 30a, 30b having the same configuration are hooked at predetermined positions on the front of the vehicle bodies 12, 12a, 12b in the initial process of the manufacturing line. These mobile communication devices 30, 30a, 30b store specification information SD (model, standard, car body number, production history, etc.) of each of the vehicle bodies 12, 12a, 12b in advance, and a fixed communication device 20 to be described later is used. Read command
When receiving the RC, the respective specification information SD is transmitted at a predetermined cycle via the electromagnetic wave of the frequency f.

On the other hand, a work station 39 is installed at a predetermined position on the side of the conveyor 11. In this work station 39, 20 receives the specification information SD which is periodically transmitted from the mobile communication device 30 hooked to the vehicle body 12 which is the work target of the work station 39 via electromagnetic waves of frequency f. The fixed communication device 20 is the fixed communication device, and the fixed communication device 20 constantly transmits the read command RC from the antenna 40 to a predetermined space near the conveyor 11 in front of the work station 39. Reference numeral 41 is a robot that performs a predetermined work on the vehicle body 12 corresponding to the specification information SD, and 42 is a robot controller that controls the drive of the robot 41.

Note that the vehicle body 12a has not been subjected to the predetermined work by the robot 41 in the work station 39, and the vehicle body 12b
Indicates that the robot 41 in the work station 39 has already performed a predetermined work and has been transported to the next work station. The mobile communication device 30b hooked on the vehicle body 12b is a read command R from the fixed communication device 20.
In response to C, the specification information SD is being periodically transmitted. The mobile communication device 30a hooked on the vehicle body 12a is also in a state of receiving the read command RC from the fixed communication device 20 and periodically transmitting the specification information SD.

Reference numeral 43 is a sequence controller that inputs the specification information SD specific to the vehicle body 12 from the fixed communication device 20, determines a work command corresponding to this specification information SD, and outputs this work command to the robot controller 42. This sequence controller
Reference numeral 43 stores in advance a series of vehicle body numbers such as vehicle bodies 12, 12a, 12b which are put into the production line from a host device (not shown),
The vehicle body 12b is next to the vehicle body 12 and the vehicle body 12 is next to the vehicle body 12a.
And so on.

[Configuration of mobile communication device]

The specific configuration of the mobile communication device 30 is as shown in FIG.

Reference numeral 22 is an antenna section, and 23 is an AD conversion circuit, which amplifies and detects a weak high-frequency analog signal from the antenna section 22 with a predetermined gain and performs AD conversion. Reference numeral 24 is a decoder that checks whether or not the read command RC is present in the digital signal from the AD conversion circuit, for example, by reading the signal identification code provided at the beginning of the signal in the digital signal to determine whether it is the first data communication. It is also possible to detect whether or not the read command RC exists in the digital signal by identifying the signal type such as whether the read command RC is the communication of the specification information SD or not, and the read command RC is detected in the digital signal. When the presence is detected, a read command RC is output to the delay generation circuit 25 described later, and a stop signal that causes the detection circuit 29 described later to stop its operation for a predetermined time corresponding to the approximate input time of the read command RC. Output SP.

Reference numeral 25 denotes a delay generation circuit, which operates an internal random number generation circuit when receiving a read command RC from the decoder 24, and each time the generated random number is multiplied by the specification information communication time to calculate the time, etc. After performing a delay operation for a randomly determined time, a read signal Rl is output to the memory operation circuit 26 described later, and when the read end signal E from the memory operation circuit 26 is input, the read signal Rl is output. To stop. The delay generation circuit 25 temporarily stops its operation when an operation stop signal SP1 is input from a detection circuit 29, which will be described later, and starts the operation again when the operation stop signal SP1 is not input.

Reference numeral 26 is a memory operation circuit, which reads the specification information SD specific to the vehicle body 12 from the RAM 27 described later when receiving the read signal Rl from the delay generation circuit 25, and the specification information SD will be described later.
Output to the DA conversion circuit 28. This memory operation circuit 26 is
When all the specification information SD is read from M27, a read end signal E is output to the delay generation circuit 25. Like the delay operation circuit 25, the memory operation circuit 26 temporarily stops its operation when an operation stop signal SP1 from a detection circuit 29 described later is input, and restarts its operation when the operation stop signal SP1 is released. It is supposed to start.

Reference numeral 27 denotes a RAM in which specification information SD unique to the vehicle body 12 is stored in advance, and is stored in advance in the initial process of the manufacturing line. 28
Is a DA conversion circuit, and the specification information from the memory operation circuit 26
The SD signal is converted into an analog signal by DA conversion, and the carrier signal of a predetermined frequency f is used to perform, for example, PCM modulation, and the modulated signal SD1 is transmitted via the antenna unit 22.

Reference numeral 29 is a detection circuit, which stops the operation for a predetermined time corresponding to the approximate input time of the read command RC when the stop signal SP is input from the decoder 24, and there is no stop signal SP input from the decoder 24. When the digital signal is input from the AD conversion circuit 23, it is determined whether or not the other mobile communication devices 30a and 30b are transmitting the respective specification information SD to the fixed communication device 20 as a digital signal. By identifying the received signal as noise (disturbance noise) by matching with the clock signal, if it is not noise, read the identification code in the digital signal and identify the signal type such as read command RC or specification information SD. And detect. This detection circuit 29 is configured such that the other mobile communication devices 30a and 30b are provided with the respective specification information S for the fixed communication device 20.
When it is detected that D is being transmitted, the operation stop signal SP1 is output to the delay generation circuit 25 and the memory operation circuit 26.

Therefore, in the detection circuit 29, another mobile communication device 30a or 30b
Is transmitting the specification information SD, and when the other mobile communication device 30a or 30b is transmitting the specification information, the detection circuit 29 generates the operation stop signal SP1 so that the memory operation circuit 26 operates. No, the specification information SD is not transmitted from the mobile communication device 30, and another mobile communication device 30
When the specification information SD is not transmitted from a or 30b, the mobile communication device 30 delays the reading by the delay generation circuit 25 for a certain time after receiving the read command RC, and then transmits the specification information SD.

The configuration of the mobile communication devices 30a and 30b is also the mobile communication device 30 described above.
The configuration is the same.

The antenna section 22, the AD conversion circuit 23, and the decoder 24 realize the receiving means 31, the delay generating circuit 25 realizes the delay means 36, and the memory operating circuit 26 corresponds to the reading means 32.
Corresponds to the storage means 33, and the DA conversion circuit 28 and the antenna section
22 corresponds to the transmission means 34, and the detection circuit 29 includes the detection means 35.
Is equivalent to.

[Configuration of fixed communication device]

On the other hand, regarding the configuration of the fixed communication device 20, 40 is the above-mentioned antenna, and 44 is a high frequency amplifier circuit for amplifying the electromagnetic wave of the frequency f coming from the mobile communication device 30. Reference numeral 46 denotes an AD conversion circuit, which converts the high frequency analog signal from the amplification circuit 44 into a digital signal. 47 is a digital control circuit, which processes the digital signal from the AD conversion circuit 46,
The specification information SD of each of the vehicle bodies 12, 12a, 12b is demodulated. In addition, the digital control circuit 47 uses the demodulated specification information SD
The data is sequentially stored in a predetermined address of the RAM 48. Reference numeral 48 is a RAM that stores specification information SD. Reference numeral 50 is a RAM that stores a calculation processing program.

Reference numeral 51 denotes a microprocessor, which performs arithmetic processing based on the program stored in the RAM 50 and the specification information SD stored in the RAM 48. The microprocessor 51 has a function of rewriting the specification information SD stored in each mobile communication device 30, 30a, 30b into new specification information SD based on input information from an external keyboard device (not shown). I also have.

Reference numeral 52 denotes a digital control circuit, which receives new specification information SD from the microprocessor 51, adds a write command WC to the specification information SD, and outputs it to the oscillator 53. 53 is an oscillator, which oscillates a carrier signal of a predetermined frequency f. Reference numeral 54 is a DA conversion circuit, which modulates the carrier signal of the frequency f oscillated by the oscillator 53, time-divides this modulated signal SD1 and converts it into an analog signal for output. 55 is a high frequency amplifier circuit, which amplifies the modulated signal SD1 from the DA conversion circuit 54 and sends it out through the antenna 40.

56 is an interface circuit, a microprocessor
After the 51 performs a predetermined arithmetic processing based on the respective specification information SD stored in the RAM 48, the specification information SD of the vehicle body 12 is transmitted to the sequence controller 43 via the interface circuit 56.

A common bus 49 serves as a path for exchanging information among the RAMs 48, 50, the microprocessor 51, the interface circuit 56, and the digital control circuit 52.

Further, when the new specification information SD is input from the keyboard device or the like, the microprocessor 51 causes the mobile communication device 30, 30a via the digital control circuit 52, the oscillator 53, the DA conversion circuit 54, the high frequency amplification circuit 55, and the antenna 40. New specification information to 30b
It is designed to send SD. And mobile communication device
30 etc. write command WC from the fixed communication device 20 to the antenna section
When it is received via 22, the decoder 24 decodes the write command WC, and the memory operation circuit 26 inputs the following specification information SD via the delay generation circuit 25 and stores it in the RAM 26.

[Operation of Example]

A mobile communication device 30 attached to the vehicle body 12 about to undergo a predetermined work at the work station 39, a mobile communication device 30b attached to a vehicle body 12b after a predetermined work at the work station 39, Each of the mobile communication devices 30a attached to the vehicle 12a coming next to the vehicle body 12 at the work station 39 receives the read command RC from the fixed communication device 20 and periodically receives the respective specification information SD from the fixed communication device.
The operation of the specification management device for this article will be described assuming that the transmission is continued to 20.

First, the mobile communication device 30 attached to the vehicle body 12 transported to the work station 39 receives the read command RC from the fixed communication device 20 via the antenna unit 22 and the AD conversion circuit 23 and converts it into a digital signal. The decoder 24, which converts and sequentially inputs the digital signal, reads the read command RC in the received signal by, for example, a method of interpreting the content of the signal head part at the time of inputting the signal head part and identifying the signal type.
Is detected, the input read command RC is output to the delay generation circuit 25, and the stop signal SP is output to the detection circuit 29 until the output of the read command RC is completed.

The detection circuit 29, to which the stop signal SP is input, stops the detection process for the input signal from the AD conversion circuit 23 for a predetermined time corresponding to the approximate input time of the read command RC.

On the other hand, the delay generation circuit 25, which receives the read command RC from the decoder 24, outputs the read signal Rl to the memory operation circuit 26 to instruct to read the specification information SD unique to the own article, and the memory operation circuit 26 Based on the read signal Rl, the specification information SD is read from the RAM 27.

However, after the decoder 24 has input all the read commands RC and stopped the output of the stop signal SP, before sending the specification information SD from the mobile communication device 30 itself, the specification information SD is sent from the mobile communication device 30b. When the signal is input via the antenna unit 22 and the AD conversion unit 23, the detection circuit 29 inputs the specification information SD converted into a digital signal from the AD conversion unit 23, and checks the clock signal to identify that it is not noise. However, if it is identified as the specification information SD from the identification code of the digital signal, since the mobile communication device 30 itself does not transmit the specification information SD, the transmission signal of the specification information SD from the other mobile communication device 30a or 30b. Is detected, and it is detected that another device is transmitting. In this way, when the detection circuit 29 detects that the preceding mobile communication device 30b is transmitting the specification information SD unique to the article, the detection circuit 29 outputs the operation stop signal SP1 to the delay generation circuit 2
5 and the memory operation circuit 26.

When the operation stop signal SP1 is input from the detection circuit 29, the delay generation circuit 25 does not output the read signal Rl to the memory operation circuit 26, and the memory operation circuit 26 also does not read from the RAM 27.

After that, immediately after the mobile communication device 30b finishes transmitting the specification information SD, the mobile communication device 30b waits for the transmission for a predetermined time.
The transmission signal from is no longer detected, and the operation stop signal SP1
Output is stopped.

Since the operation stop due to the operation stop signal SP1 has been released, the delay generation circuit 25 receiving the read command RC from the decoder 24 outputs the read signal Rl to the memory operation circuit 26,
The memory operation circuit 26, to which the read signal Rl is input, sequentially reads the specification information SD stored in the RAM 27,
SD is transmitted to the fixed communication device 20 via the DA conversion circuit 28 and the antenna unit 22. Then, the memory operation circuit 26 outputs the end signal E to the delay generation circuit 25 when all the specification information SD is read from the RAM 27.

When the decoder again receives the read command RC from the fixed communication device 20 and the other mobile communication device 30a or 30b finishes transmitting the specification information SD, the above-described operation is repeated again.

When the fixed communication device 20 receives the specification information SD transmitted by the mobile communication device 30 in response to the read command RC at the antenna 40, the high frequency amplification circuit 44 amplifies the signal of the frequency f and outputs it to the AD conversion circuit 46. . The AD converter circuit 46 is a high frequency amplifier circuit 44.
Convert the high frequency analog signal from to a digital signal. The digital control circuit 47 processes the digital signal from the AD conversion circuit 46 and demodulates the specification information SD of the vehicle body 12.
Also, this digital control circuit 47 demodulates this specification information.
The SD is stored in the RAM 48 at a predetermined address. The microprocessor 51 performs arithmetic processing based on the program stored in the RAM 50 and the specification information SD stored in the RAM 48.
Then, the microprocessor 51 determines the specification information SD of the vehicle body 12
Is transmitted to the sequence controller 43 via the interface circuit 56.

When the sequence controller 43 receives the specification information SD, it determines the vehicle body number included in the specification information SD and recognizes the arrival of the vehicle body 12. Next, a predetermined work instruction corresponding to this specification information SD is output to the robot controller 42. Then, the robot controller 42 performs a predetermined operation on the vehicle body 12 by controlling the driving of the robot 41.
If the predetermined work is performed on the vehicle body 12 in this way,
The conveyor 11 conveys the vehicle body 12a. Then, the same operation as described above is repeated.

Although the present embodiment has been described with reference to a vehicle body manufacturing line of an automobile manufacturing factory, the present invention is not limited to this, and can also be applied to, for example, a specification management device for articles stacked in multiple stages on a pallet. .

〔The invention's effect〕

As described above, according to the present invention, when the mobile communication device (30) communicates with the fixed communication device (20), the storage unit (31) stores the article-specific specification information (SD) in advance. When the receiving means (32) of the mobile communication device (30) receives the read command (RC) from the fixed communication device (20), the receiving means (32) converts the received signal into a digital signal and transmits it. The confirmation means (33) having received this digital signal discriminates whether or not the read command (RC) is present in the digital signal, and if the read command (RC) is present, the delay means (35).
When the stop signal (SP) from the confirmation means (33) is input to the detection means (34), the read command (RC) is output to the detection means (34), and the stop signal (SP) is output to the detection means (34). Stops its operation for a predetermined time, and after the predetermined time has elapsed or when the stop signal (SP) is not input, identifies whether the digital signal input from the receiving means (32) is specification information (SD), If the result is the specification information (SD), the operation stop signal (SP1) is continuously output while the specification information (SD) is being received, and the delay means (35) is the detection means (34). If the operation stop signal (SP1) is input from, the operation is stopped, the operation stop signal (SP1) is not input from the detection means (34), and the confirmation means (33)
If there is a read command (RC) input from the confirmation means (33), the read command signal (Rl) generated based on the read command (RC) from the confirmation means (33) is randomly input after the read command (RC) is input. After delaying for a predetermined time, the data is output to the following reading means (36), and the reading means (36) detects the detection means (34).
When the operation stop signal (SP1) from the device is input, the operation is stopped, and the operation stop signal (SP) from the detection means (34)
When the read instruction signal (Rl) is input from the delay means (35) without inputting 1), the read instruction signal (Rl) is input.
Based on the specification information (S
D) is read, the transmission means (37) converts the specification information (SD) unique to the own article read by the reading means (36) into an analog signal of a predetermined frequency, and wirelessly communicates with the fixed communication device (20). Fixed communication device (2
Mobile communication devices (30,3)
0, ..., 30) sends the specification information (SD) to the fixed communication device (20) at different times, and receives the specification information (SD) to the fixed communication device (20) without interference. Can be made. As a result, it is possible to prevent the mobile communication devices (30, ..., Or 30) from interfering with each other's communication with the fixed communication device (20), and to have a plurality of mobile communication devices (30, 30, It is possible to enable communication of specification information (SD) from positions close to each other by 30, ..., 30).

In this case, the delay means (35) activates the built-in random number generation circuit when the operation stop signal (SP1) is not input and the read command (RC) is input from the confirmation means (33), A delay operation is performed for a predetermined time specified based on a randomly selected value (random number), and then a read instruction signal (Rl) is output, and a read means (36) stores the storage means (3).
Since it is possible to read the specification information (SD) peculiar to its own product from 1), the delay time of each mobile communication device (30) is set to be different, and the start time of each information call for the products that arrive almost at the same time can be set. It is possible to make communication at different times after calling the specification information (SD) that is continuously called without causing interference.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to the claims of the present invention, FIG. 2 is a configuration diagram of an article specification management device in one embodiment of the present invention, FIG. 3 is a configuration diagram of a mobile communication device in FIG. 2 is a block diagram of a fixed communication device in FIG. 2, and FIG. 5 is a block diagram of a specification management device for articles in the prior art. 20 …… Fixed receiver 30,30a, 30b …… Mobile communication device 31 …… Memory means 32 …… Reception means 33 …… Confirmation means 34 …… Detecting means 35 …… Delaying means 36 …… Reading means 37 …… Sending Means RC ... Read command SD ... Specification information

Claims (2)

[Claims] 1. A mobile communication device (30) which accompanies a moving product on a manufacturing line, stores specification information (SD) unique to the product, and wirelessly communicates the specification information (SD) at a single frequency, A fixed communication device that is connected to a higher-level device that manages the above-mentioned article, is placed at a predetermined position in the manufacturing line, and automatically reads the specification information (SD) specific to the article from the mobile communication device (30) by wireless communication. (20) and a plurality of mobile communication devices (3
0,30, ..., 30) is attached to each of the mobile communication devices (30), the specification information (SD) peculiar to the product is attached to each mobile communication device (30). Storage means (31) stored in advance, read command (RC) from the fixed communication device (20), and specification information (SD) from other mobile communication devices (30, ..., 30)
Receiving means (32) for receiving a communication signal from another communication device and including converting the received communication signal into a digital signal, and a read command (in the digital signal input from the receiving means (32). RC) is present, and if a read command (RC) is present in the digital signal, the read command (RC) is output to the delay means (35) and the detection means (34) described below. Confirmation means (33) for outputting a stop signal (SP) for stopping the operation of the above for a predetermined time to the following detection means (34)
And when the stop signal (SP) from the confirmation means (33) is input, the operation is stopped for the predetermined time, and after the predetermined time has elapsed or when the stop signal (SP) is not input, the reception is performed. Detects whether the digital signal from the means (32) is the specification information (SD), and if it is the specification information (SD), the operation stop signal (SP1) is continuously output while receiving the specification information. When the operation stop signal (SP1) from the means (34) and the detection means (34) is input, the operation is stopped, and the input of the operation stop signal (SP1) is completed or the input is stopped. If not, after delaying the read instruction signal (Rl) generated based on the read command (RC) from the confirmation means (33) by a predetermined time randomly determined after the input of the read command (RC), Delay means (output to the following reading means (36) ( 3
5) and when the operation stop signal (SP1) from the detection means (34) is input, the operation is stopped, and when the operation stop signal (SP1) is input or is not input. A read means (36) for reading the specification information (SD) peculiar to the own article from the storage means (31) based on the instruction of the read instruction signal (Rl) from the delay means (35), and the read means (36). The specification management device for an article, further comprising: a transmission unit (37) for DA-converting the specification information (SD) unique to the article read by the above) into an analog signal having a predetermined frequency and wirelessly transmitting the analog signal. 2. A random number generating circuit incorporated in the delay means (35) when the operation stop signal (SP1) is not input and a read command (RC) is input from the confirmation means (33). Is activated, and a delay operation is performed for a predetermined time specified based on the generated random number, and then the reading means (36).
A read instruction signal (Rl) is output to the read means (36) to cause the read means (36) to read the specification information (SD) unique to the own article from the storage means (31). Item specification management device according to item.