RFID tag printing device and RFID tag coding and verification method
By integrating encoding and verification antenna modules into the RFID tag printing device, combined with the dynamic adjustment of the main control board and the electromagnetic shielding layer, the problems of poor encoding accuracy, low verification efficiency, and unstable printing quality in the existing technology are solved. This achieves efficient and continuous integrated printing and verification, ensuring the accuracy of tag information and printing quality.
Patent Information
- Application Number
- CN202510996015.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-18
- Publication Date
- 2025-11-04
AI Technical Summary
Existing RFID tag printing devices face problems such as poor encoding accuracy, low verification efficiency, and unstable printing quality in high-speed continuous printing scenarios. In particular, the encoding process is prone to cross-writing and miswriting, which can render the tags unusable and may cause business chaos and economic losses.
The RFID tag printing device integrates an encoding antenna module and a verification antenna module. The printing speed and read/write power are dynamically adjusted through the main control board to achieve integrated printing, encoding, and verification. The paper detector is used to locate the tag position, and an electromagnetic shielding layer is set during the encoding and verification process to reduce external interference.
This improved the accuracy of information on each label and the overall printing quality, avoided business disruptions caused by errors, increased production efficiency, reduced external interference, and ensured stable reading and writing of RFID chip data.
Smart Images
Figure CN120886573A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of label printing, and particularly relates to an RFID label printing device and an RFID label encoding and checking method. BACKGROUND
[0002] The RFID label printing device is an intelligent device integrating printing function and RFID encoding function, and is mainly used for surface graphic printing and data writing operation on a label with an embedded RFID chip. With the wide application of RFID technology in the fields of logistics tracking, retail management, intelligent manufacturing, etc., an integrated device capable of realizing high-efficiency and high-precision RFID label printing and encoding has become a key development direction in the industry.
[0003] At present, the RFID label printing devices on the market mostly adopt a continuous paper feeding mode (such as a roll) to improve production efficiency. However, in such devices, due to the small physical isolation between adjacent labels, in order to avoid RFID signal string writing, a near-field antenna is usually used as an encoding antenna to limit the reading and writing range. Although this method can prevent miswriting to a certain extent, it has a short reading and writing distance, a limited coverage area, and is easily affected by environmental interference, which may cause the encoding object to be not the current expected label, thereby causing data writing errors.
[0004] In addition, there is a certain manufacturing difference in RFID labels, and the antenna reading and writing signal is easily affected by environmental factors such as metal and water vapor, making it difficult to accurately control the actual reading and writing range. Once string writing or miswriting occurs, not only will the label not be able to be used normally, but it may also cause serious confusion in subsequent business processes, and even cause economic losses. In order to ensure the accuracy of RFID label data writing, existing technologies generally rely on a checking mechanism after encoding. Common checking methods include:
[0005] (1) After batch printing is completed, all encoded labels are sent to a special RFID checking device for one-by-one checking. This method can effectively detect errors, but increases additional process and equipment costs.
[0006] (2) Manually check label data one by one, which is inefficient and prone to errors, and is not suitable for large-scale application scenarios.
[0007] Meanwhile, in order to improve the overall work efficiency, the existing RFID label printing device usually completes the RFID encoding operation synchronously in the printing process. For example, a typical thermal transfer label printer with a resolution of 300 dpi, the printing speed is generally between 4 ips ~ 8 ips (101.6 mm / s ~ 203.2 mm / s). If the RFID encoding time is about 150 ms, at a printing speed of 6 ips (152.4 mm / s), the label moves a distance of about 22.86 mm during encoding. This is far beyond the safe reading and writing range of the encoding antenna in the non-sheet-fed system, and it is easy to cause the problem of string writing. Therefore, in the prior art, the non-sheet-fed RFID printing device usually suspends printing when performing RFID encoding, and restarts printing after encoding is completed. However, this approach has the following significant defects:
[0008] (1) Affect the printing quality: the mechanical impact during the suspension and restart process may cause the printing image to be misaligned, resulting in obvious blank lines. In order to compensate for this problem, the device often needs to back up the printing position (usually about 1 mm) and then continue printing. Even so, there may still be visual defects at the junction, affecting the appearance quality of the label. For example, Figure 1 The A area in the figure shows.
[0009] (2) Reduce printing efficiency: suspending printing for encoding and back-up actions will increase the processing time per label and reduce overall production efficiency.
[0010] In summary, the existing RFID label printing device faces problems such as poor encoding accuracy, low verification efficiency, and unstable printing quality in the high-speed continuous printing scenario, and there is an urgent need to propose a technical solution that can realize efficient and continuous printing and verification integration while ensuring encoding accuracy. SUMMARY
[0011] The technical problem to be solved by the present application is to provide a technical solution that realizes efficient and continuous printing and verification integration while ensuring encoding accuracy, in view of the above-mentioned defects of the prior art.
[0012] The present application provides an RFID label printing device, the device comprising a main control board, an RFID read-write module, a print head module, an encoding antenna module, a verification antenna module, a paper detector;
[0013] The encoding antenna module and the verification antenna module are sequentially arranged along the label paper path, and are connected to the RFID read-write module through feed lines and controlled by the RFID read-write module to perform read-write operations on the RFID label.
[0014] The encoding antenna module comprises an encoding antenna, and the checking antenna module comprises a checking antenna and an antenna cover; the RFID tag passes from a side close to the checking antenna; and an electromagnetic shielding layer is arranged in the antenna cover;
[0015] The paper detector is used for positioning the position of the RFID tag.
[0016] The main control board is electrically connected with the RFID read-write module, the paper detector and the print head module; the main control board is used for calibrating different types of RFID tags, and automatically adjusting the printing speed according to the printing task requirement, so as to realize continuous printing, encoding and checking operations.
[0017] In the RFID tag printing device, the encoding antenna module is arranged on the print head module, and the encoding antenna module is moved upward when the print head module is opened.
[0018] In the RFID tag printing device, the checking antenna module is arranged outside the paper outlet, and comprises a cover plate, an antenna cover, a checking antenna and a mounting seat arranged in sequence from top to bottom, and is fixed to the outside of the paper outlet through the mounting seat.
[0019] In the RFID tag printing device, the encoding antenna module and the checking antenna module share one RFID read-write module, or are independently connected with different RFID read-write modules.
[0020] The application further provides an RFID tag encoding and checking method applied to the RFID tag printing device, and the method comprises the following steps:
[0021] In step S1, the main control board performs encoding calibration and checking calibration operations according to the RFID tag type, obtains calibration parameters, and performs read-write time testing according to different RFID data amounts, and records the data read-write time testing results; the calibration parameters comprise an optimal encoding area, an optimal checking area and optimal read-write power;
[0022] In step S2, the main control board obtains the position of the RFID tag through the paper detector positioning result, adjusts the printing speed according to the calibration parameters, the data read-write time testing results and the encoding write data amount, so as to complete the encoding operation within the time when the optimal encoding area on the RFID tag passes through the encoding antenna;
[0023] In step S3, after the encoding operation is completed, the RFID tag continues to advance to the checking antenna signal coverage area, the main control board adjusts the printing speed according to the calibration parameters, the data read-write time testing results and the checking read data amount, so as to complete the checking operation within the time when the optimal checking area on the RFID tag passes through the checking antenna.
[0024] In the RFID tag encoding and checking method, the optimal encoding area includes an optimal encoding area start position and an optimal encoding area end position, both of which are distances relative to the RFID tag head; the optimal checking area includes an optimal checking area start position and an optimal checking area end position, both of which are distances relative to the RFID tag head.
[0025] In the RFID tag encoding and checking method, the RFID data read-write time test includes:
[0026] (1) testing the time required for reading the unique identification code of the RFID tag;
[0027] (2) testing the time required for writing different data amounts to the RFID tag.
[0028] In the RFID tag encoding and checking method, in step S2, the specific method for adjusting the printing speed according to the calibration parameters, the data read-write time test results and the encoding write data amount is:
[0029] Step S21: calculating a first actual time required for the optimal encoding area on the RFID tag to pass through the encoding antenna at the current printing speed;
[0030] Step S22: calculating an encoding total time according to the current encoding data amount and the data read-write time test results; the encoding total time is the sum of the time required for reading the unique identification code and the time required for writing the encoding data amount;
[0031] Step S23: if the first actual time is greater than or equal to the encoding total time, maintaining the current printing speed to perform the encoding operation; if the first actual time is less than the encoding total time, calculating a first maximum allowed printing speed, and reducing the printing speed so that the printing speed when the optimal encoding area of the RFID tag passes through the encoding antenna does not exceed the first maximum allowed printing speed;
[0032] Step S24: restoring the original printing speed after the encoding is completed.
[0033] In the RFID tag encoding and checking method, in step S3, the specific method for adjusting the printing speed according to the calibration parameters, the data read-write time test results and the checking read data amount is:
[0034] Step S31: calculating a second actual time required for the optimal checking area on the RFID tag to pass through the checking antenna at the current printing speed;
[0035] Step S32, calculating the total checking time according to the current reading data amount and the data reading and writing time test result; the total checking time is the time required for reading the unique identification code;
[0036] Step S33, if the second actual time is greater than or equal to the total checking time, maintaining the current printing speed to perform the checking operation; if the second actual time is less than the total checking time, calculating the second maximum allowed printing speed, and reducing the printing speed so that the printing speed when the RFID tag passes the checking antenna in the optimal checking area does not exceed the second maximum allowed printing speed;
[0037] Step S34, restoring the original printing speed after the checking is completed.
[0038] Compared with the prior art, the present application has the following beneficial effects:
[0039] 1. Integrating the encoding antenna module and the checking antenna module in the RFID tag printer, realizing the integration of printing, encoding and checking, ensuring the information of each output tag is accurate and correct, and avoiding the business confusion or economic loss caused by the miscode.
[0040] 2. The printing speed can be dynamically adjusted according to the tag type, the encoding area length, the reading and writing time and other parameters, so that the RFID tag completes the data writing in the optimal encoding area and completes the data reading and checking in the optimal checking area, without stopping the printing, avoiding the printing misalignment, blank line and other quality problems caused by the traditional "stop-restart", improving the overall appearance quality of the output tag, and improving the overall work efficiency.
[0041] 3. The optimal reading and writing power is determined through the calibration operation, and the antenna cover is set, effectively reducing the external interference, and ensuring the stable reading and writing of the RFID chip data. BRIEF DESCRIPTION OF DRAWINGS
[0042] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application. In the drawings:
[0043] Figure 1 Schematic diagram of the printing defect effect caused by stopping the printing for RFID encoding.
[0044] Figures 2-7 Schematic diagram of the stereoscopic structure of the RFID tag printing device provided by the embodiment of the present application.
[0045] Figure 8 Schematic diagram of the cross-sectional view of the RFID tag printing device provided by the embodiment of the present application.
[0046] Figure 9 Schematic diagram of the cross-sectional view of the RFID tag printing device provided by the embodiment of the present application. Figure 8The partial amplification schematic diagram of the encoding antenna module and the checking antenna module.
[0047] Figure 10 The partial amplification schematic diagram of the encoding antenna module.
[0048] Figure 11 The installation explosion schematic diagram of the checking antenna module.
[0049] Figure 12 The step schematic diagram of the RFID encoding and checking method provided by the embodiment of the present application.
[0050] Figure 13 The optimal encoding range and printing effect schematic diagram of the RFID tag provided by the embodiment of the present application.
[0051] In the drawings:
[0052] 10, main control board;
[0053] 20, RFID read-write module;
[0054] 30, printing head module;
[0055] 40, encoding antenna module;
[0056] 50, checking antenna module; 51, cover plate; 52, antenna cover; 53, checking antenna; 54, mounting seat;
[0057] 60, paper detector;
[0058] 70, paper outlet;
[0059] 80, RFID tag;
[0060] 90, tag paper path. DETAILED DESCRIPTION
[0061] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.
[0062] The embodiments of the present application will be described in further detail below in conjunction with the drawings of the present application. It should be understood that the embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.
[0063] The present application provides an RFID label printing device suitable for RFID label checking and meeting the requirements of high printing speed and high quality. The device is particularly suitable for application scenarios requiring efficient and accurate processing of RFID labels, such as logistics management, retail commodity tracking, etc.
[0064] As shown in Figures 2-11 , the RFID label printing device includes a main control board 10, an RFID read-write module 20, a print head module 30, a coding antenna module 40, a checking antenna module 50, and a paper detector 60.
[0065] The coding antenna module and the checking antenna module 50 are sequentially arranged along the label paper path 90, connected to the RFID read-write module 20 through feed lines, and controlled by the RFID read-write module 20 to perform read-write operations on the RFID label 80.
[0066] The coding antenna module 40 includes a coding antenna, and the checking antenna module 50 includes a checking antenna 53 and an antenna cover 52. The RFID label 80 passes from the side close to the checking antenna 53. The antenna cover 52 is provided with an electromagnetic shielding layer to block the electromagnetic signals between the checking antenna and the outside of the antenna cover, ensuring the accuracy of data reading in the RFID chip during the checking process.
[0067] The paper detector 60 is used to locate the position of the RFID label 80.
[0068] The main control board 10 is electrically connected to the RFID read-write module 20, the paper detector 60, and the print head module 30. The main control board 10 is used to calibrate different types of RFID labels 80 and automatically adjust the printing speed according to the printing task requirements to realize continuous printing, coding, and checking operations.
[0069] Figures 2-11 A schematic diagram of the RFID label printing device according to a preferred embodiment of the present application. Among them, Figure 2 、 Figure 4 、 Figure 5 A schematic diagram of the printing assembly area, Figure 3 A schematic diagram of the control area behind the display screen, Figure 6 、 Figure 7 A schematic diagram of the structure of the printing area after opening the cover, Figure 8 A lateral sectional view of the printing area, Figures 9-11 A detailed schematic diagram of the coding antenna module and the checking antenna module.
[0070] For the RFID tag, it is required to print bar code, text and / or picture content on its surface as a common tag, and it is also required to write data corresponding to the printed content on the chip inside the RFID tag. In the embodiment of the present application, the encoding antenna module 40 is used to write data into the RFID tag 80, and the print head module 30 is used to print content on the surface of the RFID tag 80. The print head module 30 and the encoding antenna module 40 are arranged on the label paper path 90. The present application does not have special limitation on the relative position of the print head module 30 and the encoding antenna module 40. As shown in Figures 6-7 the encoding antenna module 40 is arranged on the print head module 30, and when the print head module 30 is opened, the encoding antenna module 40 is lifted up and does not block the label passage, which is convenient for installation operation. The arrangement of the encoding antenna module 40 on the print head module 30 can be compatible with both common RFID tags and metal-resistant RFID tags. The metal-resistant RFID tag refers to the RFID tag which can be attached to the metal surface, and the bottom of the tag is attached with an electromagnetic shielding layer to ensure that the RFID information is not affected by the metal when reading. Therefore, when encoding the metal-resistant tag, the encoding antenna should not be arranged below the metal-resistant tag. The embodiment of the present application does not have special requirement on the position of the encoding antenna module 40, and the encoding antenna module 40 can also be arranged in a movable manner to adapt to different types and sizes of RFID tags and ensure the best data writing effect.
[0071] The verification antenna module 50 is arranged behind the encoding antenna module 40 in the label paper path 90, and specifically, it can be arranged in the shell of the label printer body or outside the label printer body. As shown in Figure 2 , Figure 4 the verification antenna module 50 is arranged outside the paper outlet 70. As shown in Figure 11 the verification antenna module 50 includes a cover plate 51, an antenna cover 52, a verification antenna 53 and a mounting seat 54 arranged in sequence from top to bottom, and is fixed outside the paper outlet 70 through the mounting seat 54. The embodiment of the present application does not have special limitation on the distance between the verification antenna and the encoding antenna, as long as the verification antenna 53 is located behind the encoding antenna in the label paper path 90 to realize the encoding first and then the verification. As shown in Figure 8 , Figure 9 in the preferred embodiment of the present application, the encoding antenna module is arranged inside the shell of the printer body and above the print head module, the verification antenna module is arranged outside the paper outlet, the length of the encoding antenna is 108.5 mm, the width is 5 mm, the length of the verification antenna is 119.6 mm, the width is 13.8 mm, and the distance between the center of the verification antenna and the center of the encoding antenna in the horizontal direction is 26.5 mm, and the distance in the vertical direction is 1.7 mm.
[0072] In some embodiments of the present application, the encoding antenna module 40 and the checking antenna module 50 share one RFID read-write module 20. As shown in FIG. 2, the printer body is divided into two independent areas by a partition, the RFID read-write module 20 and the main control board 10 are arranged in the area behind the screen, and the encoding antenna module 40 and the checking antenna module 50 are arranged in the other area. By partitioning, the mutual interference of components in the two areas is reduced. Figure 2 、 Figure 3 As shown in FIG. 2, the printer body is divided into two independent areas by a partition, the RFID read-write module 20 and the main control board 10 are arranged in the area behind the screen, and the encoding antenna module 40 and the checking antenna module 50 are arranged in the other area. By partitioning, the mutual interference of components in the two areas is reduced. In other embodiments of the present application, the encoding antenna module 40 and the checking antenna module 50 each use one RFID read-write module 20, and the two RFID read-write modules 20 are connected with the main control board 10. By using two RFID read-write modules 20, the encoding and checking are isolated, which can avoid the problem of the checking result caused by the fault of the shared RFID read-write module itself, and also can improve the encoding and checking efficiency and accuracy.
[0073] In other embodiments of the present application, the electromagnetic shielding layer is not arranged in the antenna cover 52 of the checking antenna module 50, but is arranged directly on the checking antenna 53, so as to reduce the interference of the external environment.
[0074] As shown in FIG. 2, the printer body is divided into two independent areas by a partition, the RFID read-write module 20 and the main control board 10 are arranged in the area behind the screen, and the encoding antenna module 40 and the checking antenna module 50 are arranged in the other area. By partitioning, the mutual interference of components in the two areas is reduced. Figure 12 As shown in FIG. 2, the printer body is divided into two independent areas by a partition, the RFID read-write module 20 and the main control board 10 are arranged in the area behind the screen, and the encoding antenna module 40 and the checking antenna module 50 are arranged in the other area. By partitioning, the mutual interference of components in the two areas is reduced.
[0075] Step S1, the main control board performs encoding calibration and checking calibration operations according to the RFID tag type, obtains calibration parameters, and performs read-write time test according to different RFID data volume, and records the data read-write time test result; the calibration parameters include the best encoding area, the best checking area, and the best read-write power;
[0076] Step S2, the main control board obtains the position of the RFID tag in real time through the paper detector positioning result, adjusts the printing speed according to the calibration parameters, the data read-write time test result, and the encoding write data volume, so as to complete the encoding operation within the time when the best encoding area on the RFID tag passes through the encoding antenna;
[0077] Step S3, after the encoding operation is completed, the RFID tag continues to advance to the checking antenna signal coverage area, the main control board adjusts the printing speed according to the calibration parameters, the data read-write time test result, and the checking read data volume, so as to complete the checking operation within the time when the best checking area on the RFID tag passes through the checking antenna.
[0078] The so-called RFID tag is a tag with an embedded antenna and RFID chip. The designs of RFID tags are different from each other, and the positions and sizes of RFID chips in RFID tags of the same size can also be different. Therefore, in the embodiment of the present application, for each type of RFID tag, a calibration operation needs to be performed on the tag to obtain the optimal reading and writing position and the optimal reading and writing power, so as to improve the accuracy and efficiency during actual encoding and checking. The calibration related to encoding is briefly described as follows: the sample tag is slowly passed through the encoding antenna, the encoding antenna records the tag position during scanning of the RFID tag, adjusts the reading and writing power of the antenna, obtains the signal of the RFID tag under different positions and reading and writing powers, and then the optimal reading and writing power and the optimal encoding area are obtained through comparison. In the embodiment of the present application, after the optimal encoding area is obtained through calibration, the starting position OEZ_start of the optimal encoding area and the ending position OEZ_end of the optimal encoding area are recorded. The range of the optimal encoding area is related to the size of the RFID tag and the internal structure of the RFID tag. The starting position OEZ_start of the optimal encoding area and the ending position OEZ_end of the optimal encoding area are both relative to the tag head of the RFID tag, that is, the distance from the tag head of the RFID tag, for example, the starting position OEZ_start of the optimal encoding area is 12 mm, and the ending position OEZ_end of the optimal encoding area is 20 mm, which indicates that the range of the optimal encoding area is the range of 12 mm-20 mm from the tag head of the RFID tag, and the length of the optimal encoding area OEZ_length = OEZ_end-OEZ_start. As shown in the RFID tag of Fig. Figure 13 The lower edge of the tag is taken as the tag head, B is the starting position of the optimal encoding area, and C is the ending position of the optimal encoding area.
[0079] During the printing process, when the RFID tag enters the encoding area, the encoding operation is performed. The encoding operation refers to that the encoding antenna reads the unique identification code of the RFID tag, and then performs the data writing operation with the unique identification code as the target tag. After the data writing is successful, the encoding is completed. The unique identification code is the globally unique identity number of the RFID tag. For UHF (Ultra-High Frequency) tags, the unique identification code refers to the TID fixed in the RFID tag by the manufacturer. For HF (High Frequency) tags, the unique identification code refers to the UID fixed in the RFID tag by the manufacturer.
[0080] In the embodiment of the present application, after the optimal encoding area and the optimal reading and writing power are obtained through calibration, the RFID data reading and writing time test is also performed, including:
[0081] (1) Test the time T_read required for reading the unique identification code (TID / UID) of the RFID tag, and the test result is usually in the order of ms, for example, 20 ms.
[0082] (2) Test the time T_write required for writing different data amounts to the RFID tag, for example, 40 ms for writing 64 Byte data and 100 ms for writing 128 Byte data. The data area of the RFID tag includes different areas such as EPC, USER, etc., and if the data structure to be written is different, the data writing time will be slightly different. In the test, the actual data structure and data amount in the printing task are tested.
[0083] After calibration, save the above calibration results for subsequent encoding.
[0084] Based on the same calibration principle in the encoding process, the entire label sample label is slowly passed through the verification antenna, the verification antenna can be calibrated to obtain the best verification position, and the reading of the unique identification code of the RFID tag and the data reading time of different data amounts in the RFID tag are recorded. The best verification area includes the start position of the best verification area and the end position of the best verification area, both of which are distances relative to the head of the RFID tag.
[0085] The RFID tag printing device is provided with a paper detector, and the main control board obtains the position of each label through the paper detector, and then judges the position of the RFID tag relative to the printing head module, the encoding antenna and the verification antenna by combining the positions of the preset printing head module, the encoding antenna and the verification antenna, controls the printing head module to print on the RFID tag, the encoding antenna to read and write data on the RFID tag, and the verification antenna to verify the data written in the RFID tag. The position relationship between the printing head module and the encoding antenna is not specially limited in the embodiment of the application, so the surface printing and encoding of a RFID tag can be performed simultaneously; it can also be that the printing is performed first and then the encoding is performed, the encoding of the last label is performed while the next label is being printed; or the encoding is performed first and then the printing is performed, the printing of the last label is performed while the next label is being encoded.
[0086] In the embodiment of the application, the specific method for adjusting the printing speed according to the calibration parameters, the data read-write time test results and the encoding write data amount in step S2 is:
[0087] Step S21, calculate the first actual time required for the best encoding area on the RFID tag to pass through the encoding antenna at the current printing speed;
[0088] Step S22, total encoding time is calculated according to the current encoding data amount and the data read-write time test result; the total encoding time is the sum of the time required for reading the unique identification code and the time required for writing the encoding data amount;
[0089] Step S23, if the first actual time is greater than or equal to the total encoding time, the current printing speed is maintained to perform the encoding operation; if the first actual time is less than the total encoding time, the first maximum allowable printing speed is calculated, and the printing speed is reduced so that the printing speed when the optimal encoding area of the RFID tag passes through the encoding antenna does not exceed the first maximum allowable printing speed;
[0090] Step S24, the original printing speed is restored after the encoding is completed.
[0091] In the printing process, before the RFID tag enters the identification range of the encoding antenna, the host control board calculates the first actual time T_actual=OEZ_length / feed_rate of the optimal encoding area on the RFID tag passing through the encoding antenna according to the printing speed and the range of the optimal encoding area, wherein feed_rate represents the current printing speed. At the same time, according to the result of the RFID data read-write time test, the total encoding time T_required=T_read+T_write required for the RFID tag encoding antenna to read and write data is calculated, wherein T_read represents the time required for reading the unique identification code, and T_write represents the time required for writing the encoding data amount. If T_actual>=T_required, the RFID tag can pass through the encoding antenna at the current printing speed. If T_actual<T_required, the first maximum allowable printing speed max_feed_rate=OEZ_length / T_required of the tag in the optimal encoding area is calculated. Then, according to the current printing speed, the first maximum allowable printing speed, and a preset acceleration, the position of starting deceleration is calculated so that the forward speed of the tag when entering the optimal encoding area is reduced to within max_feed_rate, the printing speed remains unchanged in the optimal encoding area, and the printing speed is restored to the printing speed before deceleration after leaving the optimal encoding area.
[0092] In some embodiments of the application, the host control board caches the encoding data in advance into the RFID read-write module, so that the RFID read-write module is ready for data writing in advance, avoids real-time delay, and improves the encoding efficiency.
[0093] In the embodiment of the application, in step S3, the specific method of adjusting the printing speed according to the calibration parameter, the data read-write time test result, and the verification read data amount is:
[0094] Step S31, calculating a second actual time required for the optimal verification area on the RFID tag to pass the verification antenna at the current printing speed;
[0095] Step S32, calculating a total verification time according to the current read data amount and the data read-write time test result; the total verification time is the time required for reading the unique identification code;
[0096] Step S33, if the second actual time is greater than or equal to the total verification time, maintaining the current printing speed to perform the verification operation; if the second actual time is less than the total verification time, calculating a second maximum allowed printing speed, and reducing the printing speed so that the printing speed when the optimal verification area of the RFID tag passes the verification antenna does not exceed the second maximum allowed printing speed;
[0097] Step S34, restoring the original printing speed after the verification is completed.
[0098] When the label printing device sends the label whose RFID encoding has been completed and whose surface content printing has been completed or partially completed into the signal coverage range of the verification antenna module, the verification antenna reads the data of the RFID chip as verification data; the verification data can include the unique identification code provided by the RFID tag when it is manufactured and the data written into the RFID chip of the label when encoding. The main control board compares the verification data with the unique identification code obtained when encoding and the data written when encoding to complete the verification. If the verification fails, the label printing verification failure flag can be rolled back and an alarm can be given, or the label that fails the verification can be output through a special channel. Because it has been verified whether the writing is successful when the label is encoded, in order to improve the verification efficiency, only the unique identification code of the label can be verified when the verification is performed, so that the verification antenna only needs to read the TID or UID data, which significantly reduces the data reading time.
[0099] According to the same principle, the printing speed is automatically adjusted before entering the verification area, so that the optimal verification area of the RFID tag passes the verification antenna, and the antenna has sufficient data reading time, and at the same time, the printing action does not pause.
[0100] The calibration of the RFID tag is crucial to improve the printing quality, the encoding quality and the verification quality. In some embodiments of the present application, an adaptive calibration strategy is adopted, and the system is automatically recalibrated after a preset number of labels are printed or the number of continuous errors reaches a preset threshold, so as to ensure the system stability and reliability under long-time operation.
[0101] In the embodiment of the present application, when calibrating, the time required for encoding and the optimal encoding area, the time required for checking and the optimal checking area are recorded, and by adjusting the printing speed, the time required for completing encoding and checking in the optimal position range is met, so that the printing does not need to be paused. In the printing process, the encoding is performed without stopping by adjusting the printing speed, and the encoding is performed after the printing is not paused, so that the printing is smooth and there is no feeling of stoppage, and the printing effect is not affected by the stoppage, and of course, the action of backing the label is no longer needed, so that the problem of printing defects caused by pausing the printing and backing is avoided. As shown in Figure 13 the optimal reading and writing area range, the printing effect is not flawed at all, and compared with the case of pausing the printing during encoding and checking, the printing efficiency of RFID labels of different sizes and types is improved by 30%-50%.
[0102] Compared with the prior art, the present application has the following beneficial effects:
[0103] 1. The encoding antenna module and the checking antenna module are integrated in the RFID label printer, the integration of printing, encoding and checking is realized, the information of each output label is ensured to be accurate and correct, and the business confusion or economic loss caused by the miscode is avoided.
[0104] 2. The main control board can dynamically adjust the printing speed according to the label type, the length of the encoding area, the reading and writing time and other parameters, so that the RFID label completes the data writing in the optimal encoding area and completes the data reading and checking in the optimal checking area, the printing does not need to be paused, the quality problems such as printing misalignment and blank line caused by the traditional "pause-restart" are avoided, the overall appearance quality of the output label is improved, and the overall work efficiency is improved.
[0105] 3. The optimal reading and writing power is determined through the calibration operation, and the antenna electromagnetic shielding layer is set, so that the external interference is effectively reduced, and the stable reading and writing of the RFID chip data are ensured.
[0106] 4. The use of ordinary RFID labels and anti-metal labels is supported, and the applicability of the equipment is improved.
[0107] 5. The encoding antenna module and the print head module are linked and set, so that the installation and replacement of the label are facilitated, and the smooth passage of the label is ensured.
[0108] 6. The periodic automatic calibration strategy is set, or the recalibration is automatically triggered when continuous errors occur, so that the long-term operation stability is ensured.
[0109] In summary, the present application provides an RFID label printing device and an RFID label encoding and checking method which are reasonable in structure, perfect in function and intelligent in control, and solve the key problems such as poor encoding accuracy, low checking efficiency and unstable printing quality in the prior art, have significant technical progress and good market promotion value.
[0110] The above merely provides the specific implementation of the present application, and cannot be used to limit the scope of the present application. The equivalent changes made by those skilled in the art according to the present application, and the changes well known to those skilled in the art, shall still fall within the scope of the present application.
Claims
1. An RFID tag printing device, characterized in that, The device includes a main control board (10), an RFID reading and writing module (20), a print head module (30), an encoding antenna module (40), a verification antenna module (50), and a paper detector (60); The coded antenna module (40) and the verification antenna module (50) are arranged sequentially along the label paper path (90), and are respectively connected to the RFID read / write module (20) through feed lines, and are controlled by the module to perform read / write operations on the RFID tag (80); The coded antenna module (40) includes a coded antenna, and the verification antenna module (50) includes a verification antenna (53) and an antenna cover (52); the RFID tag (80) passes through the side closest to the verification antenna (53); an electromagnetic shielding layer is provided inside the antenna cover (52); The paper detector (60) is used to locate the position of the RFID tag (80); The main control board (10) is electrically connected to the RFID read / write module (20), the paper detector (60), and the print head module (30). The main control board (10) is used to calibrate different types of RFID tags (80) and automatically adjust the printing speed according to the printing task requirements to achieve continuous printing, encoding and verification operations.
2. The RFID tag printing device according to claim 1, characterized in that, The coded antenna module (40) is mounted on the printhead module (30). When the printhead module (30) is opened, the coded antenna module (40) moves upward accordingly.
3. The RFID tag printing device according to claim 1, characterized in that, The verification antenna module (50) is located outside the paper outlet (70) and includes a cover plate (51), an antenna cover (52), a verification antenna (53), and a mounting base (54) arranged sequentially from top to bottom, and is fixed to the outside of the paper outlet (70) by the mounting base (54).
4. The RFID tag printing device according to claim 1, characterized in that, The coded antenna module (40) and the verification antenna module (50) share an RFID read / write module (20), or they can be independently connected to different RFID read / write modules (20).
5. An RFID tag encoding and verification method, applied to the RFID tag printing device as described in any one of claims 1-4, characterized in that, The method includes the following steps: Step S1: The main control board performs encoding calibration and verification calibration operations according to the RFID tag type, obtains calibration parameters, and performs read / write time tests according to different RFID data volumes, recording the data read / write time test results; the calibration parameters include the optimal encoding area, the optimal verification area, and the optimal read / write power; In step S2, the main control board obtains the position of the RFID tag in real time through the paper detector positioning result, and adjusts the printing speed according to the calibration parameters, the data read and write time test results and the amount of encoded data written, so as to complete the encoding operation within the time of the encoding antenna passing through the optimal encoding area on the RFID tag. Step S3: After the encoding operation is completed, the RFID tag continues to move to the area covered by the verification antenna signal. The main control board adjusts the printing speed according to the calibration parameters, the data read / write time test results, and the amount of verification data read, so as to complete the verification operation within the time it takes for the verification antenna to pass through the optimal verification area on the RFID tag.
6. The RFID tag encoding and verification method according to claim 5, characterized in that, The optimal coding area includes the optimal coding area start position and the optimal coding area end position, both of which are distances relative to the head of the RFID tag; the optimal verification area includes the optimal verification area start position and the optimal verification area end position, both of which are distances relative to the head of the RFID tag.
7. The RFID tag encoding and verification method according to claim 5, characterized in that, The RFID data read / write time test includes: (1) Test the time required to read the unique identification code of the RFID tag; (2) Test the time required to write different amounts of data to the RFID tag.
8. The RFID tag encoding and verification method according to claim 7, characterized in that, In step S2, the specific method for adjusting the printing speed based on the calibration parameters, the data read / write time test results, and the amount of encoded data written is as follows: Step S21: Calculate the first actual time required for the optimal coding area on the RFID tag to pass through the coding antenna at the current printing speed; Step S22: Calculate the total encoding time based on the current amount of encoded data and the test results of data read / write time; the total encoding time is the sum of the time required to read the unique identifier and the time required to write the amount of encoded data. Step S23: If the first actual time is greater than or equal to the total encoding time, then maintain the current printing speed and perform the encoding operation. If the first actual time is less than the total encoding time, then the first maximum allowable printing speed is calculated and the printing speed is reduced so that the printing speed when passing the encoding antenna in the optimal encoding area of the RFID tag does not exceed the first maximum allowable printing speed. Step S24: After encoding is completed, resume the original printing speed.
9. The RFID tag encoding and verification method according to claim 7, characterized in that, In step S3, the specific method for adjusting the printing speed based on the calibration parameters, the data read / write time test results, and the amount of data read is as follows: Step S31: Calculate the second actual time required for the optimal verification area on the RFID tag to pass through the verification antenna at the current printing speed; Step S32: Calculate the total verification time based on the current amount of data read and the test results of data read / write time; the total verification time is the time required to read the unique identification code. Step S33: If the second actual time is greater than or equal to the total verification time, then maintain the current printing speed and perform the verification operation. If the second actual time is less than the total verification time, then the second maximum allowable printing speed is calculated and the printing speed is reduced so that the printing speed when passing the verification antenna in the optimal verification area of the RFID tag does not exceed the second maximum allowable printing speed. Step S34: After verification, restore the original printing speed.