Method for print detection of transparent and translucent consumables and device therefor

Abstract

The application relates to a printing detection method and device for transparent and translucent consumables, which comprises the following steps: calibrating a paper with a known light transmittance with a sensor, recording the variable voltage threshold range of the sensor corresponding to the light transmittance of the paper, passing the paper between the sensor and a light source, acquiring the light transmittance of the paper by the sensor, and adjusting the feedback voltage threshold according to the acquired light transmittance, and judging the material of the paper according to the feedback voltage threshold of the sensor. In this way, the material of the paper to be printed can be automatically identified, and after the material of the paper is acquired, the temperature of the print head of the sublimation printer and other parameters can be adjusted according to the material of the paper, the waste of consumables caused by identification errors is reduced, the printing efficiency and material utilization rate are improved, the adaptability to environmental factors (such as light changes and background interference) is improved, and the stability and reliability of the equipment in different working environments are enhanced.

Description

Technical Field

[0001] This application relates to the field of thermal sublimation printing technology, and more particularly to a printing inspection method and apparatus for transparent and semi-transparent consumables. Background Technology

[0002] Dye-sublimation printers typically use CMYO ribbons for printing, and the consumables are usually opaque paper. Traditional printers use a pair of photoelectric sensors to detect whether the consumable has passed through a specific part of the printer. In the traditional configuration, the transmitter sends a signal to the receiver; if the consumable is opaque, it blocks the signal, causing the receiver to not receive the signal and thus generate a signal to identify the presence of the consumable. However, when the paper is transparent or semi-transparent, different paper materials have different printing temperatures and other parameters during dye-sublimation printing. Therefore, printing different types of paper using the same printing parameters will affect the print quality. Summary of the Invention

[0003] In view of this, this application proposes a printing inspection method and apparatus for transparent and semi-transparent consumables, which can automatically detect the material of the paper and adjust parameters according to the paper material.

[0004] According to one aspect of this application, a printing detection method for transparent and semi-transparent consumables is provided, comprising: calibrating a sensor with paper of known transmittance, and recording the paper transmittance corresponding to the variable voltage threshold range of the sensor;

[0005] The paper passes between the sensor and the light source, the sensor acquires the light transmittance of the paper, and the sensor adjusts the feedback voltage threshold based on the acquired light transmittance.

[0006] The sensor determines the material of the paper based on the voltage threshold fed back by the sensor.

[0007] In one possible implementation, the sensor is calibrated based on paper with known light transmittance, and the range of variable voltage thresholds of the sensor corresponding to different paper light transmittances is recorded, including:

[0008] The voltage threshold fed back by the sensor is adjusted according to the light transmittance of the paper.

[0009] Record the light transmittance of different types of paper, corresponding to the voltage threshold fed back by the sensor;

[0010] The voltage threshold fed back by the sensor corresponds one-to-one with the light transmittance of the paper.

[0011] In one possible implementation, the paper passes between the sensor and the light source, the sensor acquires the light transmittance of the paper, and the sensor adjusts the feedback voltage threshold based on the acquired light transmittance, including:

[0012] The sensor receives the incident light source passing through the paper and obtains the light transmittance of the paper according to the light transmittance calculation formula.

[0013] The sensor adjusts the voltage threshold by adjusting the variable resistance of the sensor based on the light transmittance of the paper.

[0014] In one possible implementation, adjusting the voltage threshold by adjusting the variable resistance of the sensor includes:

[0015] The sensor includes a light source receiver and a microprocessor. The light source receiver and the microprocessor are connected in parallel, and multiple variable resistors are connected in parallel between the light source receiver and the microprocessor. The resistance values ​​of the multiple variable resistors are different.

[0016] The light source receiver adjusts the variable resistor within a corresponding range according to the received incident light source;

[0017] The voltage threshold fed back by the sensor is adjusted according to the resistance value of the variable resistor within the corresponding range.

[0018] In one possible implementation, the sensor determines the material of the paper based on a voltage threshold fed back by the sensor, including:

[0019] The terminal compares the paper transmittance signal received by the sensor with a preset voltage threshold to determine the paper material with different transmittance.

[0020] The terminal delivers the paper material to the printer.

[0021] In one possible implementation, the variable voltage threshold range includes:

[0022] When the light transmittance is between 1% and 10%, the voltage threshold is in the range of 5-5.5V.

[0023] When the light transmittance is 10%-20%, the voltage threshold is in the range of 4.5-5V;

[0024] When the light transmittance is between 20% and 40%, the voltage threshold is in the range of 4-4.5V.

[0025] When the light transmittance is between 40% and 60%, the voltage threshold is within the range of 3-4V.

[0026] When the light transmittance is 60%-80%, the voltage threshold is in the range of 2-3V;

[0027] When the light transmittance is 80%-100%, the voltage threshold is in the range of 1-2V.

[0028] In one possible implementation, the formula for calculating the transmittance is:

[0029]

[0030] Where I is the light intensity after passing through the paper, and I0 is the original light intensity.

[0031] One possible implementation also includes:

[0032] The terminal obtains the paper's material information and sends it to the printer;

[0033] Based on the paper material information, the printer's printing parameters are preset;

[0034] The printer prints paper according to its printing parameters.

[0035] A printing apparatus using the aforementioned printing detection method for transparent and translucent consumables, comprising: a printer, a mounting bracket, a sensor, and a light source;

[0036] Both the mounting bracket and the light source are located at the printing inlet of the printer, and the mounting bracket is spaced at a preset distance from the printing inlet of the printer.

[0037] The sensor is mounted on the mounting bracket and corresponds to the light source.

[0038] One possible implementation also includes: a paper light source receiver;

[0039] The paper feed light source receiver is located below the printer's print inlet and detects the paper status.

[0040] The beneficial effects of the printing detection method and apparatus for transparent and semi-transparent consumables in this application are as follows: The printer in this application is a dye-sublimation printer, which can automatically identify the material of the paper to be printed. After obtaining the paper material, the printer can adjust parameters such as the printhead temperature according to the paper material, thereby enabling the dye-sublimation printer to effectively identify all types of consumables with a light transmittance range of 10%-100%, including high-transparency consumables that were previously difficult to detect. Wide material adaptability can be achieved through relevant resistance adjustments without replacing hardware components, enhancing the flexibility and applicability of the dye-sublimation printer, especially when handling diverse printing tasks. The improvement reduces consumable waste caused by identification errors, improves printing efficiency and material utilization, and enhances adaptability to environmental factors (such as lighting changes and background interference), thereby increasing the stability and reliability of the equipment in different working environments.

[0041] Other features and aspects of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0042] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of this application together with the specification and serve to explain the principles of this application.

[0043] Figure 1 A flowchart illustrating the printing inspection method for transparent and semi-transparent consumables according to an embodiment of this application is shown.

[0044] Figure 2 An apparatus for printing inspection methods of transparent and semi-transparent consumables according to embodiments of this application is shown. Detailed Implementation

[0045] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0046] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0049] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0050] See Figure 1 The printing inspection method for transparent and semi-transparent consumables according to embodiments of this application includes the following steps:

[0051] S100. Calibrate the paper and sensor based on the known light transmittance, and record the range of variable voltage threshold of the sensor corresponding to the light transmittance of the paper.

[0052] In this step, the sensor first needs to record information based on the different types of paper. During the printing process, as the paper passes through the printer's inlet, the sensor can directly acquire information about the paper. Different paper materials have different light transmittance, so by determining the paper material based on its transmittance, the printer can then print on different types of paper using pre-set parameters.

[0053] In this process, different types of paper are passed between a light source and a sensor, and the light transmittance of each type of paper is recorded. Specifically, different types of paper or different types of paper with different light transmittance are passed between the light source and the sensor. As the sensor receives light of varying intensities, the voltage threshold it feeds back adjusts with the changes in light intensity. The computer terminal then records the light transmittance of the paper or the type of paper with that voltage threshold.

[0054] In this way, the computer terminal will record the feedback voltage of the corresponding sensor after the same light source is emitted, and use this as a recording template. When the paper material is detected in the future, it is only necessary to compare the voltage threshold fed back by the sensor based on the intensity of the light source transmitted through the paper with the pre-recorded template to automatically complete the paper material detection.

[0055] S200, the paper passes between the sensor and the light source, the sensor acquires the light transmittance of the paper, and the sensor adjusts the feedback voltage threshold according to the acquired light transmittance.

[0056] In this step, the paper to be printed is placed in the printer's paper tray. The printer will move the paper through the light source and sensor located at the printing inlet. The light emitted by the light source passes through the paper and is received by the sensor. The variable resistor connected to the microprocessor board inside the dye-sublimation printer will adjust the voltage threshold fed back by the sensor according to the change in the intensity of the light source.

[0057] S300: The sensor determines the material of the paper based on the voltage threshold fed back by the sensor.

[0058] In this step, using paper with known light transmittance, the computer terminal has a one-to-one correspondence between the paper's light transmittance and the voltage threshold fed back by the sensor. When the paper is placed between the light source and the sensor, the light emitted by the light source passes through the paper, and after the sensor receives it, the power threshold fed back by the sensor will change according to the intensity of the received light.

[0059] Specifically, when the voltage threshold feedback from the sensor changes, it is compared with the voltage threshold range recorded by the computer terminal, thereby automatically obtaining the material of the paper to be printed.

[0060] Because the printer described in this application is a dye-sublimation printer, it can automatically identify the material of the paper to be printed. After acquiring the paper material, it can adjust parameters such as the printhead temperature based on the paper material. This allows the dye-sublimation printer to effectively identify all types of consumables with a light transmittance range of 10%-100%, including high-transparency consumables that were previously difficult to detect. Wide material adaptability can be achieved through relevant resistance adjustments without replacing hardware components, enhancing the flexibility and applicability of the dye-sublimation printer, especially when handling diverse printing tasks. The improvements reduce consumable waste caused by identification errors, improve printing efficiency and material utilization, and enhance adaptability to environmental factors (such as changes in lighting and background interference), thereby increasing the stability and reliability of the equipment in different working environments.

[0061] In one specific embodiment, the sensor is calibrated based on paper with known light transmittance, and the variable voltage threshold range of the sensor corresponding to different paper light transmittances is recorded, including the following steps:

[0062] The voltage threshold fed back by the sensor is adjusted according to the light transmittance of the paper.

[0063] In this step, papers with different known light transmittances are placed between the light source and the sensor. At this time, the voltage threshold fed back by the sensor will change due to the different light transmittances of the paper.

[0064] Record the light transmittance of different types of paper, corresponding to the voltage threshold fed back by the sensor.

[0065] In this step, paper with different light transmittance will cause the sensor's light source receiver to receive different information, and will also change the resistance value between the light source receiver and the microprocessor, thereby changing the voltage threshold fed back by the sensor. Paper with different light transmittance is recorded as having different voltage thresholds fed back by the sensor.

[0066] The voltage threshold fed back by the sensor corresponds one-to-one with the light transmittance of the paper.

[0067] In this step, a table corresponding to the paper transmittance and the sensor voltage threshold is obtained through multiple tests and records.

[0068] In one specific embodiment, paper passes between a sensor and a light source. The sensor acquires the light transmittance of the paper, and adjusts the feedback voltage threshold based on the acquired light transmittance, including the following steps:

[0069] The sensor receives the incident light source passing through the paper and obtains the light transmittance of the paper according to the light transmittance calculation formula.

[0070] In this step, when detecting the paper material, the paper is fed by the printer between the light source and the sensor. The light emitted by the light source passes through the paper and is received by the light source receiver of the sensor. Based on the intensity of the light source and the intensity of the light source after passing through the paper, the light transmittance of the paper itself can be obtained through the light transmittance calculation formula.

[0071] The sensor adjusts its feedback voltage threshold by adjusting the variable resistor on the microprocessor board connected to the sensor, based on the light transmittance of the paper.

[0072] In this step, when the sensor's light source receiver receives light, due to the different light intensities, the light source receiver is connected to the microprocessor board by multiple variable resistors in parallel, which will adjust the voltage threshold fed back by the sensor.

[0073] The sensor includes a light source receiver and a connected microprocessor board. The light source receiver and the microprocessor board are connected in parallel, and multiple variable resistors are connected in parallel between the light source receiver and the microprocessor board. The resistance values ​​of the multiple variable resistors are different. The light source receiver adjusts the variable resistors within the corresponding range according to the intensity of the incident light source. Based on the resistance values ​​of the variable resistors within the corresponding range, the sensor adjusts the voltage threshold feedback.

[0074] The sensor determines the paper material based on the voltage threshold fed back by the sensor, including: the terminal compares the light transmittance signal received by the sensor with a preset voltage threshold to determine the paper material with different light transmittance, and the terminal sends the paper material to the printer.

[0075] In one specific embodiment, the variable voltage threshold range is:

[0076] When the light transmittance is between 1% and 10%, the voltage threshold is in the range of 5 to 5.5V.

[0077] When the light transmittance is between 10% and 20%, the voltage threshold is in the range of 4.5-5V.

[0078] When the light transmittance is between 20% and 40%, the voltage threshold is in the range of 4-4.5V.

[0079] When the light transmittance is between 40% and 60%, the voltage threshold is in the range of 3-4V.

[0080] When the light transmittance is 60%-80%, the voltage threshold is in the range of 2-3V.

[0081] When the light transmittance is 80%-100%, the voltage threshold is in the range of 1-2V.

[0082] In one specific embodiment, the formula for calculating light transmittance is:

[0083]

[0084] Where I is the light intensity after passing through the paper, and I0 is the original light intensity. The result is multiplied by 100% to convert it into a percentage, representing how many percent of visible light is transmitted through the material.

[0085] It should be noted that this method is applicable to various transparent or translucent materials, such as glass, plastic films, and coatings. By measuring light transmittance, we can understand the degree to which a material blocks light, which is crucial in industries such as construction, automotive, eyewear manufacturing, and others that require light control.

[0086] In one specific embodiment, a variable resistor element is introduced into the light source receiver and the connected microprocessor board, enabling the printer to dynamically adjust the receiving power based on the current transparency of the consumables, and also adjust the receiving sensitivity in real time. This mechanism automatically optimizes the detection settings, ensuring high accuracy and response speed in consumable detection.

[0087] In this embodiment, increasing the resistance value (typically a current-limiting resistor) in the circuit can alter the sensitivity of the light source receiver. A larger resistance value reduces the current flowing through the receiver, thereby decreasing its response speed and sensitivity to the light signal. Conversely, a smaller resistance value increases the current, improving sensitivity. The receiver's power is related to the current; increasing the resistance limit restricts the current, leading to a decrease in received power. This means the received light intensity will weaken, potentially affecting the system's detection distance and accuracy. Conversely, a smaller resistance value increases the current, enhancing received power.

[0088] In this embodiment, increasing the resistance value decreases both sensitivity and receiving power, leading to a reduction in the detection range and accuracy of the light source receiver, but extending its lifespan and reducing power consumption. Conversely, decreasing the resistance value improves the system's sensitivity and receiving power, enabling the light source receiver to detect weaker light signals and operate effectively at greater distances. However, this may also increase the receiver's power consumption and heat generation, shortening its lifespan. Therefore, a variable resistor is used in the circuit, which adjusts according to changes in light intensity received by the light source receiver, optimizing both the receiver's sensitivity and the light source's receiving power.

[0089] In one specific embodiment, the method further includes: the terminal acquiring the material information of the paper and sending it to the printer. The terminal, through a sensor receiving light, causes a change in the voltage threshold fed back by the sensor. The changed voltage threshold is sent to a computer terminal, which can obtain the material of the paper to be printed by pre-recording the one-to-one correspondence between light transmittance and voltage threshold.

[0090] Based on the paper's material information, the printer's printing parameters are preset. After the printer obtains the paper's material information, parameters such as the printhead temperature can be adjusted using the preset printer parameters.

[0091] The printer prints paper according to its printing parameters. In this way, the printer can automatically adjust and print according to the paper's material.

[0092] In this embodiment, temperature control of the printhead is a crucial factor when printing on different types of paper using a dye-sublimation printer. This depends on the type of paper used and the desired print quality. Generally, the temperature range of the dye-sublimation printhead can be adjusted in the following ways:

[0093] 1. Printing on Plain Paper: Printing is typically done at a lower temperature, generally between 200℃ and 240℃. This prevents the paper from overheating and deforming or being damaged. Temperature Setting: Set the printhead temperature to around 220℃. Printhead temperature control is achieved through a thermistor and a microprocessor. The thermistor monitors the printhead temperature, while the microprocessor adjusts the current to the heating element in real time based on the preset temperature value to maintain a constant printhead temperature.

[0094] 2. Printing on Transparent Paper: Special attention needs to be paid to temperature control when printing on translucent paper with a dye-sublimation printer. Translucent paper is usually slightly thicker than transparent paper and may have slightly higher heat resistance, but temperature still needs to be carefully controlled to avoid damaging the paper or affecting the print quality.

[0095] A relatively high temperature is required to ensure complete transfer of the sublimation dye. The recommended temperature range is generally between 240°C and 270°C.

[0096] Detailed operation steps:

[0097] Prepare the translucent paper: Ensure the surface of the translucent paper is clean, dust-free, and oil-free.

[0098] Temperature setting: Set the printhead temperature to around 255℃.

[0099] 3. Printing on metallic paper: Temperature control of dye-sublimation printers requires special care. Metallic paper usually refers to paper with a metallic coating or metallization treatment on its surface. Its heat resistance and heat transfer performance are quite different from ordinary paper.

[0100] Recommendations and temperature control range for printing metallic paper:

[0101] Temperature range: Metallic paper requires a moderate temperature to ensure sufficient transfer of the sublimation dye without damaging the metallic coating. The recommended temperature range is generally between 250°C and 300°C.

[0102] Detailed operation steps:

[0103] Prepare the metal paper: Ensure the surface of the metal paper is clean, dust-free, and oil-free to ensure printing quality.

[0104] Temperature setting: Set the printhead temperature to around 275℃.

[0105] Fine-tuning settings: Adjust the temperature and print speed. The print speed for metallic paper may need to be slowed down slightly to ensure the dye has enough time to transfer.

[0106] 4. Print on high-definition paper: High-definition paper usually has a higher coating quality, which can present finer image details and more vibrant colors.

[0107] Recommendations regarding printing on high-definition paper and temperature control range:

[0108] Temperature range: High-definition paper requires a moderate temperature to ensure sufficient transfer of sublimation dyes without damaging the paper's coating. The recommended temperature range is generally between 220°C and 260°C.

[0109] Detailed operation steps:

[0110] Prepare high-definition paper: Ensure the surface of the high-definition paper is clean, dust-free, and oil-free to ensure print quality.

[0111] Temperature setting: Set the printhead temperature to around 240℃.

[0112] 5. Printed Adhesive Paper: Adhesive glossy paper has a smooth surface and adhesive layer, suitable for a variety of labels, stickers and other applications.

[0113] Recommendations and temperature control range for printing on adhesive-backed glossy paper:

[0114] Temperature range: Adhesive-backed glossy paper requires a moderate temperature to ensure sufficient transfer of sublimation dyes without damaging the paper's coating or adhesives. The recommended temperature range is generally between 230°C and 270°C.

[0115] Detailed operation steps:

[0116] Prepare adhesive-backed glossy paper: Ensure the surface of the adhesive-backed glossy paper is clean, dust-free, and oil-free to ensure printing quality.

[0117] Temperature setting: Set the printhead temperature to around 250℃.

[0118] A printing apparatus and a printing detection method using transparent and translucent consumables include: a printer 100, a mounting bracket, a sensor 200, and a light source. (See attached image) Figure 2 The mounting bracket and light source are both positioned at the print inlet of the printer 100, with a preset distance between the mounting bracket and the print inlet. The sensor 200 is mounted on the mounting bracket, corresponding to the light source. Thus, before printing, the paper passes between the light source and the sensor 200 to detect its material information. This information is then transmitted to the printer 100 before printing begins.

[0119] In one specific implementation, it also includes: a paper head light source receiver 300, which is located below the print inlet of the printer 100 and can detect the status of the photo paper to ensure that the paper enters the print area of ​​the printer 100 from the print inlet.

[0120] In one specific embodiment, the ultrasonic through-beam light source receiver operates based on the emission and reception of ultrasonic waves. This type of receiver emits ultrasonic waves and then receives them at the receiving end. If an object (whether transparent or opaque) obstructs the path between the two through-beam receivers (one emitting and one receiving), the receiving end's receiver will receive only a portion or no ultrasonic signal, resulting in a 0 / 1 signal. For transparent media, the advantage of the ultrasonic light source receiver is that its capability is unaffected by the color or transparency of the object. Operating principle: The emitting part of the ultrasonic light source receiver emits ultrasonic signals. Ultrasonic wave propagation: These sound waves travel through the air until they encounter an obstacle. If there is no obstacle, they reach the receiving end's receiver and are received. Sound wave reflection: When the sound waves encounter any object (including transparent media such as glass or plastic), the sound waves are reflected back, and the receiving end's receiver receives no or only a portion of the ultrasonic waves. Receiving reflected waves: The receiving end of the light source receiver generates a 0 / 1 level signal by distinguishing between receiving all or part of the ultrasonic waves, corresponding to the presence / absence of the consumable. In order to sensitively and reliably identify the presence or absence of changes in transparent media, it is necessary to adjust the transmission power of the ultrasonic wave at the transmitting end and the receiving sensitivity at the receiving end.

[0121] Thus, by employing ultrasonic technology, the limitations of traditional reliance on optical principles are overcome, enabling stable detection unaffected by lighting conditions, consumable color, or surface characteristics. This technology is particularly suitable for environments with complex or highly variable lighting conditions.

[0122] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A printing inspection method for transparent and semi-transparent consumables, characterized in that, include: The sensor is calibrated using paper with known light transmittance, and the range of variable voltage thresholds of the sensor corresponding to the light transmittance of the paper is recorded. The paper passes between the sensor and the light source, the sensor acquires the light transmittance of the paper, and the sensor adjusts the feedback voltage threshold based on the acquired light transmittance. The sensor determines the material of the paper based on the voltage threshold fed back by the sensor.

2. The printing inspection method for transparent and semi-transparent consumables according to claim 1, characterized in that, The sensor is calibrated using paper with known light transmittance, and the variable voltage threshold range of the sensor corresponding to different paper light transmittances is recorded, including: The voltage threshold fed back by the sensor is adjusted according to the light transmittance of the paper. Record the light transmittance of different types of paper, corresponding to the voltage threshold fed back by the sensor; The voltage threshold fed back by the sensor corresponds one-to-one with the light transmittance of the paper.

3. The printing inspection method for transparent and semi-transparent consumables according to claim 1, characterized in that, The paper passes between the sensor and the light source. The sensor acquires the light transmittance of the paper, and the sensor adjusts the feedback voltage threshold based on the acquired light transmittance, including: The sensor receives the incident light source passing through the paper and obtains the light transmittance of the paper according to the light transmittance calculation formula. The sensor adjusts the voltage threshold by adjusting the variable resistance of the sensor based on the light transmittance of the paper.

4. The printing inspection method for transparent and semi-transparent consumables according to claim 3, characterized in that, Adjusting the voltage threshold by adjusting the variable resistance of the sensor includes: The sensor includes a light source receiver and a microprocessor. The light source receiver and the microprocessor are connected in parallel, and multiple variable resistors are connected in parallel between the light source receiver and the microprocessor. The resistance values ​​of the multiple variable resistors are different. The light source receiver adjusts the variable resistor within a corresponding range according to the received incident light source; The voltage threshold fed back by the sensor is adjusted according to the resistance value of the variable resistor within the corresponding range.

5. The printing inspection method for transparent and semi-transparent consumables according to claim 1, characterized in that, The sensor determines the material of the paper based on the voltage threshold fed back by the sensor, including: The terminal compares the transmittance signal received by the sensor with a preset voltage threshold to determine the paper material with different transmittance. The terminal delivers the paper material to the printer.

6. The printing inspection method for transparent and semi-transparent consumables according to claim 3, characterized in that, The variable voltage threshold range includes: When the light transmittance is between 1% and 10%, the voltage threshold is in the range of 5-5.5V. When the light transmittance is 10%-20%, the voltage threshold is in the range of 4.5-5V; When the light transmittance is between 20% and 40%, the voltage threshold is in the range of 4-4.5V. When the light transmittance is between 40% and 60%, the voltage threshold is within the range of 3-4V. When the light transmittance is 60%-80%, the voltage threshold is in the range of 2-3V; When the light transmittance is 80%-100%, the voltage threshold is in the range of 1-2V.

7. The printing inspection method for transparent and translucent consumables according to claim 1, characterized in that, The formula for calculating light transmittance is: Where I is the light intensity after passing through the paper, and I0 is the original light intensity.

8. The printing inspection method for transparent and translucent consumables according to any one of claims 1-7, characterized in that, Also includes: The terminal obtains the paper's material information and sends it to the printer; Based on the paper material information, the printer's printing parameters are preset; The printer prints paper according to its printing parameters.

9. A printing apparatus, using the printing inspection method for transparent and translucent consumables according to any one of claims 1-8, characterized in that, include: Printer, mounting bracket, sensor, and light source; Both the mounting bracket and the light source are located at the printing inlet of the printer, and the mounting bracket is spaced at a preset distance from the printing inlet of the printer. The sensor is mounted on the mounting bracket and corresponds to the light source.

10. The printing apparatus according to claim 9, characterized in that, Also includes: Paper light source receiver; The paper feed light source receiver is located below the printer's print inlet and detects the paper status.

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