JP4676554B2 - RFID label issuing device - Google Patents

Description

  The present invention includes an RFID reader / writer that writes and reads tag data to and from an RFID tag provided on an RFID (Radio Frequency Identification) label, and a printing unit that prints label data on the printing surface of the RFID label. The present invention relates to an RFID label issuing device provided.

  In recent years, attention has been paid to an RFID label in which an RFID tag including an IC chip and an antenna is enclosed in a label seal. This RFID label is advantageous in that it is less susceptible to dirt, dust, and the like because data is written to and read from the RFID tag in a non-contact manner using wireless communication. Therefore, for example, in the physical distribution field, it is considered that the RFID label is applied as a label for article management attached to each article.

  2. Description of the Related Art Conventionally, an RFID label issuing device capable of handling an RFID label sheet in which a large number of RFID labels are arranged in a line on a belt-like mount and attached in a peelable manner has already been known. In this apparatus, a print head is provided on the leading end side along a conveyance path for conveying the RFID label paper, and an RFID reader / writer antenna is provided on the upstream side in the conveyance direction. Then, the RFID tag of the RFID label and the RFID reader / writer that are sequentially conveyed through the conveyance path communicate with each other via the antenna to write the tag data in a non-contact manner. Further, visible information is printed on the surface (printing surface) of the RFID label by a print head. By using such an RFID label issuing device, it is possible to generate an article management label as described above.

  By the way, not all RFID tags provided on an RFID label function normally. Among the many RFID labels provided on the RFID label paper, the RFID tag may be broken. The RFID label issued from the RFID label issuing device as described above can be visually judged for print data. However, since writing to the RFID tag is electrical, it cannot be visually determined whether the tag data has been written normally.

  Therefore, conventionally, when the writing of data to the RFID tag fails, an RFID label issuing device that can visually determine an abnormal label by printing a special pattern instead of normal print data on the surface of the RFID label. It has been proposed (see, for example, Patent Document 1).

  However, this type of RFID label issuance apparatus usually has an RFID reader / writer antenna attached at a short distance from the conveyance surface of the conveyance path. The reason is that if an attempt is made to increase the distance from the conveyance surface to the antenna, the apparatus must be made large and not practically used. On the other hand, the antenna has strong directivity toward the transport surface immediately above it. The reason is that it is necessary to write the tag data in a non-contact manner sequentially on the RFID labels sequentially conveyed on the antenna.

  For this reason, in the conventional RFID label issuing apparatus, the tag output data is low because the radio output level is lower than the normal value and the defective RFID tag that causes trouble in actual operation is close to the antenna. I could write it. In this case, since the defective RFID label is issued as a normal label, there is a problem in that it cannot be distinguished from an RFID label having an RFID tag having a radio output level sufficient for practical operation.

  The present invention has been made based on such circumstances, and an object of the present invention is to provide an RFID label issuing device that can easily obtain an RFID label having an RFID tag having a radio output level sufficient for practical operation. Is to provide.

The present invention relates to an RFID reader / writer for writing and reading tag data to and from an RFID tag by performing non-contact communication with an RFID tag provided on the RFID label using wireless communication, and printing of the RFID label In an RFID label issuing apparatus having a printing unit for printing label data on a surface, a predetermined value of an automatic gain control parameter is stored in advance as a threshold value, and a radio output of a signal received from an RFID tag provided on the RFID label Level determination means for comparing the parameter value of the automatic gain control for adjusting the level to an appropriate level and a threshold value, and automatic gain control for adjusting the radio output level of the received signal to the appropriate level by this level determination means RF having a RFID tag value of the parameter is greater than or equal to the threshold It is obtained by a printing control unit to print the label data by the printing unit on the printing surface of the D label.

  According to the present invention in which such measures are taken, it is possible to provide an RFID label issuing device that can easily obtain an RFID label including an RFID tag having a radio output level sufficient for practical operation.

The schematic diagram which shows the principal part of the RFID label paper used in one embodiment of this invention. The schematic diagram which expands and shows the AA arrow cross section of FIG. 1 is a block diagram showing an overall configuration of an RFID label issuing apparatus according to an embodiment of the present invention. The block diagram which shows the principal part structure of the RFID reader / writer which the RFID label issuing apparatus has. 6 is a flowchart showing a main procedure of RFID label issuing processing executed by a printer control unit included in the RFID label issuing apparatus. The schematic diagram which shows one printing example of the normal label issued from the RFID label issuing apparatus. The schematic diagram which shows one printing example of the warning label issued from the RFID label issuing apparatus. The schematic diagram which shows one printing example of the abnormal label issued from the RFID label issuing apparatus. The schematic diagram which shows the other example of a warning label issued from the RFID label issuing apparatus.

The best mode for carrying out the present invention will be described below with reference to the drawings.
First, an RFID label sheet 1 used in the present embodiment will be described with reference to FIGS.

  As shown in FIG. 1, an RFID label sheet 1 is composed of a strip-shaped mount 2 and a large number of RFID labels 3 that are attached to the surface of the mount 2 in a line in the longitudinal direction of the mount 2 so as to be peeled off. It consists of and. As shown in FIG. 2 in which the AA arrow cross section of FIG. 1 is enlarged, each RFID label 3 is provided with an IC chip 5 and an antenna 6 on the back surface side of the label sheet 4 (the adhesive surface side with the mount 2). Is a structure in which an RFID tag (or RFID inlet) 7 that is embedded in a thin film is enclosed. The surface of the label sheet 4 is used as an information printing surface. In FIG. 2, reference numeral 8 denotes an adhesive.

  The IC chip 5 of the RFID tag 7 is provided with a power generation unit, a demodulation unit, a modulation unit, a memory unit, a control unit for controlling these, and the like. The power generation unit supplies power to each part of the IC chip 5 by rectifying and stabilizing a signal corresponding to the radio wave received by the antenna 6. The demodulator demodulates a signal corresponding to the radio wave received by the antenna 6 and sends it to the controller. The modulation unit modulates the data transmitted from the control unit and transmits the data from the antenna 6. The control unit writes the data demodulated by the demodulation unit to the memory unit, reads data from the memory unit, and sends the data to the modulation unit.

  The memory unit includes a setting area that stores and holds data in an unrewritable manner and a user area in which arbitrary data can be written. An ID code is written in advance in the setting area. The ID code is a code unique to the RFID tag set for individually identifying each RFID tag 7.

  Next, the RFID label paper 1 is used to write the tag data in a non-contact manner by using wireless communication to the RFID tag 7 of the RFID label 3 that is sequentially conveyed, and the surface of the label sheet 4 in the RFID label 3 ( An RFID label issuing apparatus configured to print label print data on a printing surface will be described with reference to FIGS.

  FIG. 3 is a block diagram showing the overall configuration of the RFID label issuing apparatus. The RFID label sheet 1 is set on a label holder (not shown) while being wound in a roll shape with respect to the RFID label issuing apparatus. And the front-end | tip is drawn | fed out from a label holder, and is guide | induced to the peeling part which is not shown in figure along a predetermined conveyance path. In the peeling portion, the RFID label 3 is peeled from the mount 2. The RFID label 3 peeled off at the peeling portion is discharged from a label issuing port (not shown). The mount 2 from which the RFID label 3 has been peeled is taken up by a take-up roller (not shown).

  Now, on the conveyance path from the label holder to the peeling portion, the label sensor is sequentially arranged from the label holder side upstream in the conveyance direction of RFID label paper 1 (in the direction of arrow B in the figure) toward the peeling portion side downstream. 11. An antenna 13 and a print head 14 of the RFID reader / writer 12 are provided. The label sensor 11 and the print head 14 are provided in the upper part of the conveyance path. On the other hand, the antenna 13 is provided in the lower part of the conveyance path. Further, a platen roller 15 is provided at a position facing the print head 14 across the conveyance path. An antenna 13 may be provided in the upper part of the conveyance path.

  The label sensor 11 detects the RFID label 3 provided on the RFID label sheet 1 fed out from the label holder. For example, the label sensor 11 optically detects the leading edge of the RFID label 3 to thereby detect the RFID label 3. Is detected. The detection signal is supplied to a printer control unit 22 to be described later via the I / O port 16.

  The antenna 13 transmits radio waves (or electromagnetic waves) under the control of the RFID reader / writer 12 and receives response waves transmitted from the RFID tag 7 that has received the radio waves (or electromagnetic waves). It is provided at a close distance. And it has a strong directivity toward the conveyance surface immediately above (directly below when the antenna 13 is provided above the conveyance path). The RFID reader / writer 12 writes and reads tag data with respect to the RFID tag 7 existing in the communication area of the radio wave (or electromagnetic wave) transmitted from the antenna 13, and details thereof will be described later.

  The print head 14 is driven by a head driving unit 17 and prints various visible information on the surface of the RFID label 3 (printed surface of the label sheet 4) located on the platen roller 15, and a thermal head is used, for example. The Here, the print head 14 and the head drive unit 17 constitute a printing unit. An ink ribbon may be interposed between the print head 14 and the RFID label 3.

  In addition, the RFID label issuing apparatus includes an operation panel 18, a conveyance system drive unit 19, a communication interface 20, a memory 21, a printer control unit 22, and the like.

  The operation panel 18 is provided with various keys, a display unit, and the like. The transport system drive unit 19 functions as a drive source for the RFID label paper transport system such as the platen roller 15 and the take-up roller. The RFID label sheet 1 is transported along the transport path by the operation of the transport system driving unit 19. For example, a host device such as a personal computer is connected to the communication interface 20 via a communication line. Then, an RFID label issuance job including tag data to be written on the RFID tag 7 of the RFID label 3 and label print data such as characters to be printed on the printing surface of the RFID label 3 is sent from the host device. The RFID label issuing job received from the host device is stored and held in the memory 21 until the job is completed. The memory 21 also has an area for temporarily storing tag data edited based on an RFID label issuing job received from the host device, an area for developing an image of label print data, and the like.

  FIG. 4 is a block diagram showing a main configuration of the RFID reader / writer 12. The RFID reader / writer 12 includes an interface 31 with the printer controller 22, a reader / writer controller 32, a transmission processor 33, a reception processor 34, a circulator 35, a memory 36, and the like.

  The transmission processing unit 33 includes a modulator 41 that modulates a predetermined carrier wave with an analog transmission data signal output from the reader / writer control unit 32, an amplifier 42 that amplifies the signal modulated by the modulator 41, and the like. ing. The signal amplified by the amplifier 42 is supplied to the antenna 13 via the circulator 35 and is radiated from the antenna 1 as a radio wave (or electromagnetic wave).

  The circulator 35 has a function of outputting a signal input from the transmission processing unit 33 side to the antenna 13 and outputting a signal input from the antenna 13 side to the reception processing unit 34 side. From the antenna 13, a signal corresponding to the radio wave (or electromagnetic wave) received from the RFID tag 7 existing in the communication area is given to the circulator 35.

  The reception processing unit 34 amplifies the signal input via the circulator 35, and a demodulator 44 that demodulates the analog reception data signal by removing a predetermined carrier component from the signal amplified by the amplifier 43, Of the received data signal demodulated by the demodulator 44, an LPF (Low Pass Filter) 45 that passes a signal in a predetermined low frequency band and the intensity level of the received data signal that has passed through the LPF 45 become a constant appropriate level. AGC (Automatic Gain Control) circuit 46 for adjusting the gain (amplification factor). The reception data signal adjusted to an appropriate level by the AGC circuit 46 is supplied to the reader / writer control unit 32.

  The reader / writer control unit 32 generates a transmission data signal in response to a command from the printer control unit 22 connected via the interface 31, and provides the function to the transmission processing unit 33 and the reception processing unit 34. The received data signal is converted into data recognizable by the printer control unit 22 and provided to the printer control unit 22 via the interface 31. Further, the AGC circuit 46 has a function of generating an AGC parameter p for changing the gain of the AGC circuit 46 and giving it to the AGC circuit 46 so that the intensity level of the received data signal input from the AGC circuit 46 becomes an appropriate level. .

  The memory 36 has a read-only ROM area and a RAM area that can be freely read and written. The ROM area stores a program for controlling the operation of the reader / writer control unit 32. In addition, a register 51 having a first-in / first-out function and a reference value storage unit 52 are formed in the RAM area. In the register 51, the AGC parameter p given from the reader / writer control unit 32 to the AGC circuit 46 is written in the given order.

  FIG. 5 is a flowchart showing a processing procedure of the printer control unit 22 until one RFID label 3 is issued by the RFID label issuing apparatus of this embodiment. That is, the printer control unit 22 starts the RFID label issuing process every time the RFID label issuing job stored in the memory 21 is activated.

  First, the printer control unit 22 determines whether the label sensor 11 has detected the RFID label 3 as ST (step) 1. When the RFID label 3 is not detected, the printer control unit 22 controls the conveyance system drive unit 19 to convey the RFID label paper 1 at a constant pitch.

  If the RFID label 3 is detected by the label sensor 11, the printer control unit 22 recognizes the RFID label 3 as the issue target RFID label 3. Then, as ST2, the time required for the RFID tag 7 of the RFID label 3 to be issued to be transported until it enters the communication area of the antenna 13 is waited. This time is determined by the distance from the label sensor 11 to the antenna 13 and the conveyance speed of the RFID label paper 1. When this time has elapsed, the printer control unit 22 generates a tag write command for instructing writing of tag data edited based on the RFID issuing job being executed as ST3, and gives the RFID reader / writer 12 with the tag write command.

  The RFID reader / writer 12 that has received this tag write command operates as follows. First, the reader / writer control unit 32 generates a transmission data signal of a tag write command and gives it to the transmission processing unit 33. In the transmission processing unit 33, the transmission data signal is modulated and further amplified, and a radio wave (or electromagnetic wave) corresponding to the transmission data signal is transmitted from the antenna 13. At this time, the RFID label 3 to be issued is transported within the communication area of the antenna 13. Therefore, when the RFID tag 7 enclosed in the RFID tag 3 to be issued is activated by receiving radio waves (or electromagnetic waves), tag data is written in the memory portion of the RFID tag 7. Then, a radio wave (or electromagnetic wave) indicating a write success response is transmitted from the RFID tag 7.

  When the radio wave (or electromagnetic wave) of this writing success response is received by the antenna 13, a signal corresponding to the received radio wave (or electromagnetic wave) is given from the antenna 13 to the reception processing unit 34. In the reception processing unit 34, this signal is amplified and demodulated into a data signal of a successful write response. Further, after a signal component of a predetermined low frequency band is extracted from the data signal, it is given to the reader / writer control unit 32 via the AGC circuit 46.

  At this time, the reader / writer control unit 32 generates an AGC parameter p for changing the gain of the AGC circuit 46 so that the intensity level of the data signal supplied from the AGC circuit 46 becomes an appropriate level. The AGC parameter p is supplied to the AGC circuit 46 and written to the register 51. Thus, the data signal of the write success response adjusted to an appropriate level by the AGC circuit 46 is input to the reader / writer control unit 32. Then, the data signal is converted into data that can be recognized by the printer control unit 22 and is provided to the printer control unit 22 via the interface 31.

  In step ST3, the printer control unit 22 transmits a tag write command to the RFID reader / writer 12, and then waits for return of write success response data from the RFID reader / writer 12 in ST4. If the successful write response data is received within a predetermined time, the printer control unit 22 reads the head AGC parameter p from the register 51 of the RFID reader / writer 12 in ST5. Then, in ST5, it is determined whether or not the AGC parameter p is equal to or greater than a preset threshold value.

  Here, the AGC parameter p acquired from the RFID reader / writer 12 indicates the strength level of the data signal of the write success response from the RFID tag 7 in which the tag data is written in response to the tag write command transmitted in the process of ST3. This is a parameter given to the AGC circuit 46 for adjusting to an appropriate level.

  On the other hand, in the RFID label issuing apparatus, the antenna 13 of the RFID reader / writer 12 is attached at a close distance from the conveyance surface of the conveyance path on which the RFID label paper 1 is conveyed. Further, the antenna 13 has a strong directivity toward the transport surface immediately above. For this reason, the intensity level of the signal received from the RFID tag 7 having a normal wireless output level is increased, and distortion is likely to occur. Therefore, the strength level of the received signal is lowered to an appropriate level through the AGC circuit 46. As a result, the value of the AGC parameter p given to the AGC circuit 46 becomes large for a received signal from the RFID tag 7 having a normal wireless output level. On the other hand, since the strength level of the received signal from the RFID tag 7 whose wireless output level is lower than the normal value is originally low, the value of the AGC parameter p becomes smaller in proportion to the decrease of the wireless output level. .

  Therefore, in the present embodiment, for example, a memory is preliminarily set as a threshold value with the value of the AGC parameter p for reducing the intensity level of the received signal from the RFID tag 7 having a radio output level having no possibility of causing trouble in actual operation to an appropriate level. 21 is set. Here, the process of ST5 functions as a level determination unit that determines whether or not the wireless output level of the RFID tag 7 that has successfully communicated with the RFID reader / writer 12 is equal to or higher than the reference level.

  If the AGC parameter p is equal to or greater than the threshold value as a result of comparing the AGC parameter p with the threshold value in ST6, the printer control unit 22 determines that the wireless output level of the corresponding RFID tag 7 is equal to or higher than a reference level that can withstand practical use. Therefore, normal label print data is created as ST7. That is, the label print data image is developed in the memory 21 based on the RFID label issuing job being executed. In ST8, the time required for the printing surface of the label sheet 4 in the RFID label 3 to be issued to be conveyed to the printing start position by the print head 14 is waited. This time is determined by the distance from the label sensor 11 to the print head 14 and the conveyance speed of the RFID label paper 1. When this time has elapsed, the printer control unit 22 controls the head drive unit 17 to print out an image of normal label print data on the print surface of the RFID label 3 to be issued (print control unit).

  On the other hand, if the AGC parameter p is less than the threshold value in ST6, the wireless output level of the corresponding RFID tag 7 is a defective product that does not satisfy the reference level, so warning label print data is created in ST10. That is, a warning message image set in advance together with an image of the label print data based on the RFID label issuing job being executed is developed in the memory 21. In ST11, a warning display for notifying the user that a defective warning label is issued on the operation panel 18 is performed (alarm means).

  Thereafter, the processes of ST8 and ST9 are executed. That is, it waits for the time required for the printing surface of the RFID label 3 to be issued to be transported to the printing start position, and when this time has elapsed, the head driving unit 17 is controlled to display the warning label print data image. Print output on the printing surface of the RFID label 3 to be issued (warning print control means).

  On the other hand, if the write success response data cannot be received within the predetermined time in ST4, the tag control data writing to the RFID tag 7 has failed, so the printer control unit 22 creates abnormal label print data in ST12. To do. That is, a special pattern image set in advance is developed in the memory 21. In ST13, a warning is displayed on the operation panel 18 to notify the user that an abnormal label having an error is issued.

  Thereafter, the processes of ST8 and ST9 are executed. That is, it waits for the time required for the printing surface of the RFID label 3 to be issued to be transported to the printing start position. When this time has elapsed, the head drive unit 17 is controlled to display an image of abnormal label print data. Printing is output on the printing surface of the RFID label 3 to be issued.

  In this way, if the RFID label 3 to be issued on which normal, warning, or abnormal label printing data is printed is guided to the peeling unit, peeled off from the mount 2 and discharged from the label issuing port, the printer control unit 22 Ends the current RFID label issuing process.

  At this time, if the next RFID label issuance job is not activated, the conveyance system drive unit 19 is controlled to stop conveyance of the RFID label sheet 1. If the activated RFID label issuance job instructs to issue a plurality of labels, the RFID label issuance process is repeatedly executed as many times as the number of issued labels.

  As described above, in the RFID label issuing apparatus according to the present embodiment, it is determined whether or not the wireless output level of the RFID tag 7 that has successfully communicated with the RFID reader / writer 12 is equal to or higher than the reference level. Then, normal label data is printed on the printing surface of the RFID label 3 having the RFID tag 7 determined to have a wireless output level equal to or higher than the reference level, as shown in FIG. Is done.

  On the other hand, on the printing surface of the RFID label 3 having the RFID tag 7 determined that the wireless output level is less than the reference level, the warning message 71 “in addition to the normal label data as in the printing example shown in FIG. “TAG WARNING” is printed and issued as a warning label 70.

  Further, a special pattern is printed on the printing surface of the RFID label 3 having the RFID tag 7 in which the writing of the tag data has failed as shown in the printing example shown in FIG.

  Therefore, all the RFID labels 3 issued as the normal labels 60 have the RFID tag 7 whose wireless output level is determined to be equal to or higher than the reference level. Therefore, the RFID tag 7 having a wireless output level sufficient for practical operation is used. The provided RFID label 3 can be easily obtained.

  In addition, all RFID labels 3 having RFID tags 7 in which the tag data is normally written but the wireless output level is less than the reference level are issued as warning labels 70. Since the warning message 71 is printed on the warning label 70, it can be visually distinguished from the normal RFID label 3. Here, since the warning label 70 has the RFID tag 7 whose wireless output level is less than the reference level, there is no practical problem when used in an environment close to the antenna of the RFID reader / writer. . Therefore, if it is known that the warning label 70 is used in such an environment, even the warning label 70 can be used without being discarded, so that waste can be reduced.

  The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage.

  For example, in the above embodiment, the data with the predetermined warning message 71 added to the RFID label 3 having the RFID tag 7 whose wireless output level is less than the reference level is printed out as warning data. A special pattern image such as an image printed on the abnormal label 80 may be printed out so that it can be visually distinguished from the normal label 60.

  In the above-described embodiment, the threshold value to be compared with the AGC parameter is fixed in the level determination unit. However, for example, a command from a host device connected via the communication interface 20 or a key operation input on the operation panel 18 is used. For example, the threshold value may be arbitrarily set by the user. By doing this, each time the actual use environment of the RFID label 3 changes, the RFID label 3 enclosing the RFID tag 7 having an appropriate wireless output level is surely set by setting a threshold value suitable for the use environment. Will be obtained.

  The warning data printed on the warning label 70 is not limited to the warning message 71 as shown in FIG. For example, as shown in FIG. 9, visible information 72 indicating the value of the AGC parameter as a reference numerical value indicating the wireless output level of the RFID tag 7 may be printed on the warning label 70.

  Further, the label for printing the visible information 72 indicating the value of the AGC parameter is not limited to the warning label 70, and the visible information is printed out on the normal label 60 whose wireless output level is determined to be equal to or higher than the reference level. Thus, the performance of the RFID tag 7 enclosed in the RFID label 3 may be notified to the user.

  Further, the warning when the warning label 70 and the abnormal label 80 are issued is not limited to the display, and an alarm sound such as a buzzer sound may be sounded. In addition, the user may be able to distinguish visually or audibly by changing the contents of the alarm when the warning label 70 is issued and when the abnormal label 80 is issued.

  In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, the constituent elements over different embodiments may be combined.

  DESCRIPTION OF SYMBOLS 1 ... RFID label paper, 2 ... Mount, 3 ... RFID label, 7 ... RFID tag, 11 ... Label sensor, 12 ... RFID reader / writer, 13 ... Antenna, 14 ... Print head, 15 ... Platen, 17 ... Head drive part , 18 ... operation panel, 19 ... transport system drive unit, 20 ... communication interface, 21 ... memory, 22 ... printer controller, 32 ... reader / writer controller, 33 ... transmission processor, 34 ... reception processor, 46 ... AGC circuit 51 ... register 60 ... normal label 70 ... warning label 80 ... abnormal label

JP 2001-96814 A

Claims (7)

An RFID reader / writer for writing and reading tag data to and from the RFID tag by performing wireless communication with an RFID tag provided on an RFID (Radio Frequency Identification) label, and the RFID In an RFID label issuing device including a printing unit that prints label data on a printing surface of a label,
A predetermined value of the automatic gain control parameter is stored in advance as a threshold value, and the automatic gain control parameter value for adjusting the radio output level of the signal received from the RFID tag provided on the RFID label to an appropriate level, Level determination means for comparing the threshold value ;
By this level determination means, the printing unit applies the RFID label printing surface having the RFID tag whose automatic gain control parameter value for adjusting the wireless output level of the received signal to an appropriate level is equal to or greater than the threshold value. Print control means for printing the label data;
An RFID label issuing device comprising: An RFID reader / writer for writing and reading tag data to and from the RFID tag by performing wireless communication with an RFID tag provided on an RFID (Radio Frequency Identification) label, and the RFID In an RFID label issuing device including a printing unit that prints label data on a printing surface of a label,
A predetermined value of the automatic gain control parameter is stored in advance as a threshold value, and the automatic gain control parameter value for adjusting the radio output level of the signal received from the RFID tag provided on the RFID label to an appropriate level, Level determination means for comparing the threshold value ;
The printing unit warns the printed surface of the RFID label having the RFID tag whose automatic gain control parameter value for adjusting the wireless output level of the received signal to an appropriate level by the level judging means is less than the threshold value. Warning print control means for printing data;
An RFID label issuing device comprising: It further comprises alarm means for issuing an alarm when it is determined that the parameter value of automatic gain control for adjusting the radio output level of the received signal to an appropriate level by the level determination means is less than the threshold value. The RFID label issuing device according to claim 1 or 2.   3. The RFID label issuing apparatus according to claim 2, wherein the warning printing control unit prints data obtained by adding a predetermined warning message to the label data as warning data on a printing surface of the RFID label.   3. The RFID label issuing apparatus according to claim 2, wherein the warning print control unit causes a special pattern different from the label data to be printed on a printed surface of the RFID label. The warning print control means prints data obtained by adding a parameter value of automatic gain control for adjusting the wireless output level of the received signal to an appropriate level to the label data as warning data on the printing surface of the RFID label. The RFID label issuing device according to claim 2, wherein: The predetermined value of the parameter of the automatic gain control is a parameter value of the automatic gain control for reducing the intensity level of the received signal from the RFID label having a radio output level that does not cause any trouble in actual operation to an appropriate level. RFID label issuing apparatus according to claim 1 or 2, wherein the a value.

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