Printer ink supply control method

Abstract

The present invention relates to a method for controlling ink supply of a printer, wherein the printer comprises an ink sac; a pressure sensor is arranged in the ink sac; the negative pressure value in the ink sac is calculated, and the calculated value is compared with the set pressure value in the ink sac; if the two are inconsistent, the pressure value in the ink sac is increased or decreased.

Description

Technical Field

[0001] The invention relates to a method for controlling ink supply of a printer. Background Art

[0002] The printer is provided with an ink sac, and the inside of the ink sac is usually set to a negative pressure to supply ink to the nozzle. The pressure value in the ink sac needs to be precisely controlled to ensure the printing quality. If the actual negative pressure value in the ink sac is too large, the nozzle cannot print ink; if the actual negative pressure value in the ink sac is too small, the nozzle will drip ink. Therefore, the actual negative pressure value in the ink sac is an important factor related to the printing quality. However, in actual use, the negative pressure value in the ink sac changes with the temperature of the use environment and cannot be stably maintained at the set value. Therefore, how to keep the negative pressure value in the ink sac in accordance with the set requirements is one of the technical problems faced in this field. Summary of the invention

[0003] One of the purposes of the present invention is to overcome at least one deficiency in the prior art and to provide a method for controlling ink supply of a printer.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] A method for controlling ink supply of a printer, characterized in that the printer comprises an ink bag; a pressure sensor is arranged in the ink bag; the control method comprises the steps of:

[0006] (1) Perform linear calibration on the pressure sensor to obtain the calibration coefficient C of the pressure sensor at a certain temperature. oeifficientbase ;

[0007] (2) Measure the current ambient temperature and calculate C oeifficient ;

[0008] C oeifficient =C oeifficientbase ×(1+Tdiff / 100);

[0009] Where: Tdiff = temperature during calibration - current temperature;

[0010] (3) obtaining the voltage of the reference voltage source of the pressure sensor and the output voltage of the pressure sensor;

[0011] Calculate the pressure value in the ink sac; formula

[0012] In the formula:

[0013] P is the pressure value inside the ink sac;

[0014] V ref is the sampling value of the reference voltage source;

[0015] Vin It is the output voltage sampling value of the pressure sensor;

[0016] C oeifficient is the proportionality coefficient;

[0017] If the calculation result is a positive number, it will be treated as the opposite number;

[0018] (4) Compare the calculated value of step (3) with the set pressure value in the ink sac. If the two are inconsistent, increase or decrease the pressure value in the ink sac.

[0019] The printer ink supply control method of the present invention determines whether the negative pressure value in the ink sac meets the requirements by detecting and calculating the actual pressure value in the ink sac, and comparing it with the negative pressure setting value in the ink sac, and adjusts the negative pressure value in the ink sac when it does not meet the requirements, so as to ensure that the negative pressure value in the ink sac meets the requirements and improve the printing quality. By considering the influence of different temperatures on the negative pressure value, the influence of temperature changes on pressure detection is considered in the calculation formula, thereby increasing the accuracy of detection. Due to cost reasons, low-cost pressure sensors often have detection errors, so the calibration coefficient is first determined during detection to make the pressure sensor detection more accurate.

[0020] The printer ink supply control method of the present invention monitors the negative pressure value in the ink bag in real time, changes the working state of the air pump, changes the negative pressure value to supply ink in real time and stably. The present invention can avoid the influence of the temperature and viscosity changes of the ink on the negative pressure value in the ink bag.

[0021] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application.

[0022] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention. DETAILED DESCRIPTION

[0023] A method for controlling ink supply of a printer, characterized in that the printer comprises an ink bag; a pressure sensor is arranged in the ink bag; the control method comprises the steps of:

[0024] (1) Perform linear calibration on the pressure sensor to obtain the calibration coefficient C of the pressure sensor at a certain temperature. oeifficientbase ;

[0025] (2) Measure the current ambient temperature and calculate C oeifficient ;

[0026] C oeifficient =C oeifficientbase ×(1+Tdiff / 100);

[0027] Where: Tdiff = current temperature – temperature during calibration;

[0028] (3) obtaining the voltage of the reference voltage source of the pressure sensor and the output voltage of the pressure sensor;

[0029] Calculate the pressure value in the ink sac; formula

[0030] In the formula:

[0031] P is the pressure value inside the ink sac;

[0032] V ref is the sampling value of the reference voltage source;

[0033] V in It is the output voltage sampling value of the pressure sensor;

[0034] C oeifficient is the proportionality coefficient;

[0035] (4) Compare the calculated value of step (3) with the set pressure value in the ink sac. If the two are inconsistent, increase or decrease the pressure value in the ink sac.

[0036] 1: Perform pressure calibration on the pressure sensor at -3.0Kpa and -4.0Kpa, and obtain the reference temperature coefficients respectively

[0037] C oeifficientbase1＝ 28000(-3.0Kpa)

[0038] C oeifficientbase2＝ 25000(-4.0Kpa)

[0039] The system automatically records the ambient temperature during calibration at 30°C

[0040] 2: If the negative pressure value is set to -3.2Kpa, the -3Kpa and -4Kpa intervals are divided into 10 equal parts and linearized to obtain a new calibration coefficient

[0041] C oeifficientbase3 =28000–(28000-25000)*2 / 10=27400;

[0042] 3: The current ambient temperature is 35°C, and the reference temperature coefficient is adjusted to:

[0043] T diff =30-35=-5

[0044] C oeifficient =C oeifficientbase3 ×(1+T diff / 100)=27400*0.95=26030

[0045] After sampling and testing, we can get: Vref = 2500mv; Vin = 2150mV;

[0046] Substitute into the formula P = (2500 – Vin) * C oeifficient / 2500, calculated P = 3644.2Pa. Since the ink sac is set with a negative pressure value, the calculated result is inversely processed to obtain a pressure value of -3644.2Pa in the ink sac, which is inconsistent with the set negative pressure value of -3.2Kpa. The air pump speed is adjusted until the negative pressure value detected in the ink sac is consistent with the set value or within the allowable error range.

[0047] The printer ink supply control method of the present invention determines whether the negative pressure value in the ink sac meets the requirements by detecting and calculating the actual pressure value in the ink sac, and comparing it with the negative pressure setting value in the ink sac, and adjusts the negative pressure value in the ink sac when it does not meet the requirements, so as to ensure that the negative pressure value in the ink sac meets the requirements and improve the printing quality. By considering the influence of different temperatures on the negative pressure value, the influence of temperature changes on pressure detection is considered in the calculation formula, thereby increasing the accuracy of detection. Due to cost reasons, low-cost pressure sensors often have detection errors, so the calibration coefficient is first determined during detection to make the pressure sensor detection more accurate.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent substitution or improvement within the spirit of the present invention is included in the scope of the claims of the present invention.

Claims

1. A printer ink supply control method, characterized in that: The printer includes an ink bag; a pressure sensor is arranged in the ink bag; the control method includes the steps of: (1) Perform linear calibration on the pressure sensor to obtain the calibration coefficient C of the pressure sensor at a certain temperature. oeifficient base ; (2) Measure the current ambient temperature and calculate C oeifficient ; C oeifficient =C oeifficient base ×(1+Tdiff / 100); Where: Tdiff = current temperature – temperature during calibration; (3) obtaining the voltage of the reference voltage source of the pressure sensor and the output voltage of the pressure sensor; Calculate the pressure value in the ink sac; formula In the formula: P is the pressure value inside the ink sac; V ref is the sampling value of the reference voltage source; V in It is the output voltage sampling value of the pressure sensor; C oeifficient is the proportionality coefficient; If the calculation result is a positive number, it will be treated as the opposite number; (4) Compare the calculated value of step (3) with the set pressure value in the ink sac. If the two are inconsistent, increase or decrease the pressure value in the ink sac.

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