CN115771341A - Printer paper detection method and printer - Google Patents

Abstract

The invention relates to a paper detection method for a printer. The actual threshold value B of no paper is preset in the printer; when the printer performs paper detection work, the paper detection value C detected by a photoelectric detector is obtained, and the difference between C and B is calculated to obtain Detect the difference D=BC, if D≤Δ, it is judged that there is no paper in the printer, and if D>Δ, it is judged that there is paper in the printer, where Δ is the preset difference threshold. The printer paper detection method improves the paper detection accuracy. The present invention also relates to a printer, comprising a casing, a paper box, a photoelectric detector, a controller, and a memory arranged in the casing, the photoelectric detector is arranged facing the paper box, and the photoelectric detector and the memory are respectively connected to the controller with electrical signals A program for realizing the aforementioned printer paper detection method is stored in the memory, and the controller can call and execute the program in the memory. The printer has high detection accuracy for no paper, and has a better user experience.

Description

Printer paper detection method and printer

technical field

The invention relates to the technical field of printers, in particular to a printer paper detection method, and also relates to a printer using the printer paper detection method.

Background technique

A paper detection device is usually installed in the printer to ensure normal paper feeding and printing. In the prior art, the cooperation of an infrared emitter and a reflector is usually used to realize paper detection. For example, in the Chinese utility model patent "A Sensor for Paper Detection" with the authorized announcement number CN207622705U (application number 201721666465.6), the disclosed paper detection sensor mainly uses infrared light-emitting diodes to realize paper detection. However, when performing detection, a fixed threshold is usually set, and then the detected value is compared with the fixed threshold to determine whether there is paper. When the detected value is higher than the fixed threshold, it means that there is no paper. When the detected value is lower than the fixed threshold, it means that there is paper. The fixed threshold can be set very low, but in this way, when the printer detects the grayscale paper on one side of the printer, it may be judged as no paper, and new paper must be used to print, which is not conducive to the full utilization of resources.

Contents of the invention

The first technical problem to be solved by the present invention is to provide a paper detection method for printers that can satisfy the detection of papers of various colors and improve the accuracy of paper detection in view of the above-mentioned prior art.

The second technical problem to be solved by the present invention is to provide a printer applying the above-mentioned printer paper detection method in view of the above-mentioned prior art.

The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a printer paper detection method, which is characterized in that: the actual threshold value B of paper presence or absence is pre-stored in the printer;

When the printer performs paper detection, it obtains the paper detection value C detected by the photoelectric detector, calculates the difference between C and B, and then obtains the detection difference D=B-C. If D≤Δ, it is judged that there is no paper in the printer. If D>Δ, it is determined that there is paper in the printer, where Δ is a preset difference threshold.

Preferably, when the printer is turned on for the first time, when no paper is loaded, the photoelectric sensor is used to detect and obtain the paper detection value B in the case of no paper, and B is used as the initial actual threshold value B of no paper.

As an improvement, the minimum theoretical threshold A of no paper is preset in the printer;

When the printer is turned on for the first time, when no paper is put in, use the photoelectric sensor to detect and obtain the paper detection value B in the case of no paper. If B>A, then use B as the initial actual paper-free threshold B; if B ≤A, it prompts to detect whether the photoelectric detector is abnormal.

In order to prevent the equipment from being affected by environmental factors such as self-attenuation and dust accumulation after working for a long time, the minimum theoretical threshold A of no paper is preset in the printer;

Every time the printer is turned on, it obtains the paper detection value X detected by the photoelectric detector, and compares the paper detection value X with the minimum paper-free theoretical threshold A. If X<A, B remains unchanged, otherwise, B=X .

Preferably, the difference threshold Δ is a threshold obtained based on big data collation.

The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a printer, including a casing, a paper box, a photoelectric detector, a controller, and a memory arranged in the casing, and the photoelectric detector faces the paper box It is set that the photoelectric detector and the memory are respectively connected to the controller with electrical signals, and it is characterized in that: the memory stores a program for realizing the aforementioned printer paper detection method, and the controller can call and execute the memory in the program.

Compared with the prior art, the present invention has the advantage that: the printer paper detection method in the present invention, when judging the wrong paper based on the paper detection value C, does not simply compare with a fixed threshold, but uses paper detection The detection difference between the detection value and the actual threshold value B of no paper is used to judge whether there is paper or not. The actual threshold value B, through the difference judgment, can filter out all the differences between the printer mechanism and the photoelectric detector itself, so that it can cover and detect paper with a very high grayscale, and all kinds of colored paper can be detected, and in The paper can also be effectively detected when double-sided printing is performed, which improves the accuracy of paper detection.

However, a printer using the printer paper detection method has high detection accuracy for the presence or absence of paper in the printer, and has a better user experience.

Description of drawings

FIG. 1 is a flowchart of a printer paper detection method in an embodiment of the present invention.

Fig. 2 is a method for determining the initial actual paper-free threshold B in the embodiment of the present invention.

Fig. 3 is a method for updating the actual threshold B of no paper in the embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

The printer paper detection method in this embodiment can be applied to various laser printers and inkjet printers, and can also be applied to office equipment with printing and copying functions. Specifically, the printer includes a casing, a paper box, a photodetector, a controller, and a memory arranged in the casing. The photodetector can use various devices capable of detecting paper through light signals, such as a photodetector composed of an infrared emitting tube and an infrared receiving tube, but is not limited to this component. The photodetector is set facing the carton, so that the light emitted by the photodetector is fed back to the photodetector after being emitted by the paper in the carton. The photoelectric detector and the memory are respectively connected with the controller by electrical signals, and the controller judges whether there is paper in the paper box based on the size of the detection signal of the photoelectric detector during operation. The paper used in the printer is usually not pure black, so part of the infrared light is reflected by the paper and received by the infrared receiving tube. The infrared receiving tube is a photosensitive triode. When the infrared receiving tube receives infrared light, the leakage current will change. The greater the light intensity, the greater the leakage current and the smaller the corresponding feedback voltage value. The whiter the paper, the more infrared it reflects, and the lower the voltage. When there is no paper in the carton, almost no infrared light is reflected back, so the leakage current of the receiving tube is very large, and the feedback voltage is very large.

The memory stores a program for realizing the paper detection method of the printer as described below, and the controller can call and execute the program in the memory, that is, the controller judges whether there is paper in the paper tray according to the detection data obtained by the photoelectric detector.

In this embodiment, the printer paper detection method is specifically as follows.

As shown in FIG. 1 , the actual threshold value B of whether paper is pre-stored in the printer. When the printer is assembled on the production line and turned on for the first time, when no paper is placed in the paper box, the photoelectric sensor can be used to detect and obtain the paper detection value B in the case of no paper. The controller obtains the paper detection value and B is used as the initial actual paper-free threshold B. That is, it can be effectively judged whether there is paper in the paper box by using the actual paper-free threshold B through a certain calculation.

Specifically, when the printer performs paper detection, the controller acquires the paper detection value C detected by the photoelectric detector, and calculates the difference between C and B. Δ is a preset difference threshold, and the difference threshold Δ is a threshold obtained based on big data sorting. Based on different circuit parameters, the corresponding difference threshold Δ is also different. In this embodiment, Δ=0.15V.

Obtain the detection difference D=B-C. When there is no paper in the paper box, the difference between the C value and the B value is very small, and the difference between the two is usually less than or equal to the Δ value. When paper is placed in the paper tray, the difference between the C value and the B value is relatively large, and the difference between the two usually exceeds the Δ value. Based on this, if D≤Δ, it means that the paper detection value C is very close to the paper-free actual threshold B in the case of no paper, and at this time, it is judged that there is no paper in the printer. Correspondingly, if D>Δ, it is judged that there is paper in the printer.

In this printer paper detection method, when judging the wrong paper based on the paper detection value C, it does not simply compare with a fixed threshold, but uses the detection difference between the paper detection value and the actual paper-free threshold B to determine the presence or absence of paper. Judgment of paper, these two data itself are based on the detection value obtained by the printer’s use environment, that is, each printer has its corresponding actual threshold value B of no paper, through the difference judgment, the printer’s mechanical components and photoelectric detection The differences of the detector itself are all filtered out, so that it can cover and detect paper with a very high grayscale, and various colored paper can be detected, and it can also be effectively detected when the paper is printed on both sides, which improves the detection of paper accuracy.

In addition, in order to avoid the abnormality of the photodetector, the set actual threshold value B of no paper is too large to deviate, so that the detection of the paper condition cannot be effectively realized. In this embodiment, the minimum paper-free theoretical threshold A is preset in the printer. The paper-free theoretical threshold A is a minimum value in a paper-free state obtained through a large amount of production line data and theoretical calculations. Take the A value as an original threshold for each machine to determine the presence or absence of paper. The A value must be solidified in the firmware and cannot be tampered with at will. This value can only be modified in batches when the firmware is upgraded.

As shown in Figure 2, based on this, when the printer is turned on for the first time, when no paper is placed in the paper tray, the photoelectric sensor is used to detect and obtain the paper detection value B in the case of no paper. If B>A, the B is used as the initial actual paper-free threshold B, and the actual paper-free threshold B can be used to more accurately determine whether there is paper in the paper tray. If B≤A, it means that even relative to the minimum theoretical threshold A of no paper, the detection data of the photoelectric detector still judges that there is paper in the paper box. This way the technician can even spot photodetector problems.

As shown in Figure 3, when the user gets the printer, because the user’s environment is varied, in order to prevent the normal detection of the paper due to environmental factors such as self-attenuation and dust accumulation after the device works for a long time, it needs to be checked frequently. The actual paper-free threshold B is updated to ensure the followability between the paper-free actual threshold B and the actual usage. Based on this, every time the printer is restarted, it obtains the paper detection value X detected by the photoelectric detector, and compares the paper detection value X with the minimum paper-free theoretical threshold A. If X<A, then B remains unchanged, otherwise Let B=X.

The printer paper detection method in the present invention can filter out all the differences between the printer mechanism components and the photoelectric detector itself through the difference judgment, so that it can cover and detect paper with a very high grayscale, and various colored papers can be detected. It is detected, and it can also be effectively detected when the paper is printed on both sides, which improves the accuracy of paper detection. However, a printer using the printer paper detection method has high detection accuracy for the presence or absence of paper in the printer, and has a better user experience.

Claims (6)

1. A printer paper detection method is characterized in that: the actual threshold B without paper is prestored in the printer;

when the printer detects paper, a paper detection value C detected by the photoelectric detector is obtained, a difference value between C and B is calculated, a detection difference value D = B-C is further obtained, if D is smaller than or equal to delta, it is judged that no paper exists in the printer, if D is larger than delta, it is judged that paper exists in the printer, and delta is a preset difference value threshold.

2. The printer paper detection method according to claim 1, characterized in that: when the printer is started for the first time, under the condition that no paper is put in, a paper detection value B under the condition of no paper is obtained by utilizing the detection of a photoelectric sensor, and the value B is used as an initial actual paper-free threshold value B.

3. The printer paper detection method of claim 2, characterized in that: presetting a minimum theoretical threshold value A without paper in a printer;

when the printer is started for the first time, under the condition that no paper is put in, detecting and acquiring a paper detection value B under the condition of no paper by using a photoelectric sensor, and if B is larger than A, taking B as an initial actual paper-free threshold value B; if B is less than or equal to A, prompting to detect whether the photoelectric detector is abnormal.

4. The printer paper detection method according to any one of claims 1 to 3, characterized in that: presetting a minimum theoretical threshold value A without paper in a printer;

and when the printer is started up every time, acquiring a paper detection value X detected by the photoelectric detector, comparing the paper detection value X with a minimum theoretical paper-free threshold value A, if X is less than A, keeping B unchanged, and otherwise, letting B = X.

5. The printer paper detection method according to any one of claims 1 to 4, characterized in that: and the difference threshold delta is a threshold value obtained based on big data sorting.

6. The utility model provides a printer, includes the casing, sets up carton, photoelectric detector, controller, the memory in the casing, photoelectric detector sets up towards the carton, photoelectric detector, memory respectively with controller signal of telecommunication connection, its characterized in that: the memory stores therein a program for implementing the printer paper detection method according to any one of claims 1 to 5, and the controller is capable of calling and executing the program in the memory.

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