CN1481992A - Method and apparatus for controlling the ink jet precision of piezoelectric type int jet printing head - Google Patents
Method and apparatus for controlling the ink jet precision of piezoelectric type int jet printing head Download PDFInfo
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- CN1481992A CN1481992A CNA021369852A CN02136985A CN1481992A CN 1481992 A CN1481992 A CN 1481992A CN A021369852 A CNA021369852 A CN A021369852A CN 02136985 A CN02136985 A CN 02136985A CN 1481992 A CN1481992 A CN 1481992A
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Abstract
The present invention relates to the method and regulator for controlling the driving voltage of piezoelectric jet printing head. The method includes real-time detecting the temperature change of the printing head with the temperature sensor set inside the printing head; A/D conversion of the temperature signal in CPU and table lookup calculation to obtain voltage reference value with the table being a preset in the ROM of CPU; and regulating the voltage of the printing head via software controlled closed-loop pulse modulation mode to maintain the ink jetting state unchanged. The present invention has the features of fast reaction, high control precision, powerful antijamming capability, improved print quality and precision, etc.
Description
Technical field
The present invention relates to piezoelectric ink jet printer field, specifically relate to a kind of method and adjusting device thereof of controlling driving voltage of piezoelectric type ink jet printing header, it can automatically adjust its driving voltage according to the temperature of measured ink jet-print head, make its interference that is not subjected to the variations in temperature of printhead substantially, improve the ink jet precision and the quality of printhead.
Background technology
In the printhead of piezoelectric ink jet printer ink is housed, a piezo-electric crystal respectively is equipped with in the both sides of each the road cavity in printhead, when controller sends pulse voltage signal, and when putting on the piezo-electric crystal, it is deformed, consequent pressure extrusion cavity makes ink penetrate from the nozzle high speed.Therefore, how accurately, automatically, stable, moderately adjust printhead control voltage and quite be subjected to the widely concern of producer and technical staff in the industry always.The existing mode of adjusting voltage mainly contains:
A kind of is directly control device to be placed printer, for example, and the printhead that Britain Xaar (Sai Er) company etc. produce.But shortcomings such as this series products adjusts the mode of voltage because the electrical part caloric value is bigger, and easy generation heat radiation is bad make whole printhead temperature rise too fast, temperature is too high, thereby have a strong impact on print performance, reduce the service life of printhead, and this mode causes the production cost of printhead higher.
Another kind is to place the printhead outside, utilizes the version of adjusting pipe.For example, the driving voltage adjusting device of the printhead of Japanese EPSON (Epson) company manufacturing.Each adjustment component volume is bigger in the voltage adjustment system of this device, power is also correspondingly bigger, and all need be installed on the bigger control panel separately, need be connected to the feedback information line on high voltage source input line and the temperature sensor in actual use, thereby in number of print more for a long time, can cause the more complex situations of line, bring many inconvenience (referring to accompanying drawing 1) for the installation, maintenance etc. of printhead.
Find that by retrieval list of references FR-2636884 discloses another kind of method.By supposing constant jet velocity, this method is based on the variation as the operating pressure of black temperature funtion.This method can not only be guaranteed the FEEDBACK CONTROL of black quality, and because constant jet velocity can also keep black quality temperature independent.This method also will be carried out the measurement of jet velocity.The indicatrix of the black mass value of expectation is considered black viscosity and density simultaneously.Yet it is known that the realization of this method needs the distance between printhead and the machine.Any error of the aspect of process hardware check can not cause the deterioration of the deviation and the print quality of black quality.In addition, this method needs the operator to set reference pressure before the operating temperature of reference machine changes.
Summary of the invention
The present invention mainly is that to solve existing in prior technology printhead caloric value bigger, and volume is bigger, is subject to the comparatively technical problem of complexity etc. of Temperature Influence or temperature control method and apparatus.
The present invention has also solved existing in prior technology printhead driving voltage simultaneously and has been subject to the influence of working condition and is offset, and makes it to be difficult to the constant substantially technical problem of state of guaranteeing that ink sprays from nozzle.
In addition, because the present invention can handle temperature feedback signal nearby, thereby also solved prior art carry out series and parallel when connecting line comparatively complicated, install, use not problem very easily, and nearby the signal that collects is handled, reduce transmission link and can improve reliability, save device space.
Above-mentioned technical problem of the present invention is mainly solved by following method: it comprises by being arranged on the variations in temperature that printhead temperature inside sensor in time detects printhead; Temperature signal after analog-to-digital conversion, obtains a voltage reference value by the computing of tabling look-up by CPU again; Wherein, this value table system is calculated in advance according to sensitivity coefficient, the ink characteristics of printhead itself, and leaves in the interior ROM of CPU; Automatically realize that with the pulse width modulation mode of the closed loop that is subjected to software control the printhead driving voltage adjusts, the state that ink is sprayed from nozzle is constant substantially.
As preferably, described TEMP detects, the generation of pulse width modulation mode and modulus, digital-to-analogue conversion be by the chip microcontroller of mixed signal type.The voltage adjustment that helps realizing high voltage, little electric current, wide region is to adapt to printhead requirement to control voltage when the different temperatures.
Described control voltage is read in by another road analog-to-digital conversion of CPU after sampling, as value of feedback, compare with a reference value, press the dutycycle that fiducial value is adjusted pwm generator, thereby find the pulse width modulated wave of a suitable duty ratio, output meets sets the voltage that requires.
Described pulse width modulated wave is through the filtering of the amplification of switching tube Q and inductance, electric capacity, and by sample circuit information of voltage fed back to CPU, and CPU constantly adjusts the dutycycle of pulse width modulated wave, and output voltage can not changed because of load variations.
A kind of driving voltage of piezoelectric type ink jet printing header device that adopts said method, comprise the interface board that printhead, temperature sensor and data wire join, it is characterized in that described temperature sensor is arranged in the printhead, is provided with voltage adjusting device near described printhead; Transport to voltage adjusting device by the signal that temperature sensor obtains, the CPU in it constantly adjusts the dutycycle of pulse width modulated wave, imports suitable driving voltage with closed-loop structure to printhead.
Changed through A/D by the detection signal that temperature sensor is obtained, the computation of table lookup magnitude of voltage compares with a reference value, and meets the voltage output of setting requirement by the modulation generator output of adjusting pulsewidth; By sample circuit information of voltage is fed back to CPU, in CPU, carry out A/D and change and compare with a reference value.
Described voltage adjusting device is the single-chip microcomputer of a mixed signal type, and adopts the structure of paster encapsulation that it is installed on the interface board of each printhead independently.Because the present invention has adopted the comparatively single-chip microcomputer of ripe mixed signal type of technology, it with TEMP detect, functions such as the generation of pulse width modulation mode and modulus, digital-to-analogue conversion all independently finish in the CPU of small size, all devices all place by the printhead, the signal that is collected is handled with hardware filtering hardly, it is strong to have function, and speed is fast, and volume is little, can save hardware space, and the translation function of DC/DC and higher withstand voltage discrete component are realized.
Described pulse width modulated wave amplifies through switching tube Q, and the filtering of inductance and inductance L, capacitor C, diode D afterflow, and the sample circuit feedback actual output voltage of forming by resistance R 1 and resistance R 2, the required driving voltage of control printhead work, its magnitude of voltage is 15V-35V.
Therefore, method of the present invention and device thereof have following characteristics:
1. directly from inner its temperature that detects of printhead, and according to predefined ink temperature characteristic, the sensitivity coefficient of printhead own etc., adopt closed-loop fashion by one chip microcomputer control, processing, thereby have and be swift in response, the control accuracy height, skew, the antijamming capability of working condition such as resisting temperature, voltage are stronger, improve the stability of equipment, improve quality and the precision printed.
2. because the present invention selects for use volume little, the electric elements that caloric value is little are installed on the interface board on each printhead top or near the printhead neatly, temperature feedback signal is processed nearby like this, each printhead does not need to be returned to controller (only needing the high pressure input), significantly reduced the number of outgoing of printhead, when reducing connecting line, also the complexity of the line of Jiang Diing helps installing and daily maintenance.
3. Overall Power Consumption is lower, and caloric value is less, and is easy to operate, and use cost is lower, is beneficial to the service life of improving printhead, can be adapted to installation, the connection of single or multiple printheads widely.
Description of drawings
Accompanying drawing 1 is the sketch of a kind of wiring of prior art;
Accompanying drawing 2 is sketches of a kind of wiring of the present invention;
Accompanying drawing 3 is circuit diagrams of a kind of peripheral discrete devices of the present invention;
Accompanying drawing 4 is a kind of flow charts that carry out the operation principle of voltage adjustment of the present invention;
Accompanying drawing 5 is structural representations of a kind of printhead of the present invention.
The specific embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment: be provided with several cavitys in printhead 1, a piezo-electric crystal respectively is equipped with in the both sides of each road cavity, and is provided with temperature sensor in inking chamber, is provided with print head interface 2 on the top of printhead 1; Be connected to interface board 3 in the end of Data Control line 5, it is provided with voltage adjusting device 4, it is to adopt the single-chip microcomputer of mixed signal type and the electronic component that joins with it, and adopts the structure of paster encapsulation that it is installed on (referring to accompanying drawing 5) on each printhead interface board 3 independently.Wherein, the single-chip microcomputer of described mixed signal type with TEMP detect, functions such as the generation of pulse width modulated wave and modulus, digital-to-analogue conversion are by its integrated solution.Because the present invention's electric elements that volume is small and exquisite are installed on the interface board of each printhead or near the printhead nearby, temperature feedback signal is processed nearby like this, each printhead does not need to be returned to controller (only needing the high pressure input), has significantly reduced the number of outgoing (referring to accompanying drawing 2) of printhead.This is when reducing connecting line, and also the complexity of the line of Jiang Diing helps installing and daily maintenance.
The ink real-time temperature detection signal that obtains by temperature sensor 6, change through A/D, the computation of table lookup magnitude of voltage, compare with a reference value, and constantly adjust the dutycycle of pulse width modulated wave by the modulation generator of adjusting pulsewidth, to the suitable driving voltage of printhead 1 input, information of voltage is fed back to CPU8 with closed-loop structure by sample circuit, realize that in CPU8 signal carries out A/D and changes and compare with a reference value, adjust the output (referring to accompanying drawing 4) of driving voltage automatically.
Wherein, described pulse width modulated wave amplifies through switching tube Q, by inductance L and capacitor C filtering, after the diode D afterflow, be outputting drive voltage, simultaneously, the sample circuit of forming by resistance R 1 and resistance R 2, the signal feedback of output voltage is entered CPU8, by its control and the required driving voltage (referring to accompanying drawing 3) of adjustment printhead work.When pulse voltage signal puts on the piezo-electric crystal, it is deformed, consequent pressure extrusion cavity makes ink penetrate from the nozzle high speed.Because the present invention adopts the pulse width modulation mode of the closed loop be subjected to software control to realize that automatically the printhead driving voltage adjusts, and ink is stably sprayed from nozzle.
Claims (10)
1. method of controlling ink jet precision of piezoelectric type int jet printing head is characterized in that described method comprises:
By being arranged on the variations in temperature that printhead temperature inside sensor in time detects printhead;
Temperature signal after analog-to-digital conversion, obtains a voltage reference value by the computing of tabling look-up by CPU (8) again; Wherein, this value table system is calculated in advance according to sensitivity coefficient, the ink characteristics of printhead itself, and leaves in the interior ROM of CPU (8);
Automatically realize that with the pulse width modulation mode of the closed loop that is subjected to software control the printhead driving voltage adjusts, the state that ink is sprayed from nozzle is constant substantially.
2. the method for control ink jet precision of piezoelectric type int jet printing head according to claim 1 is characterized in that described TEMP detects, the generation of pulse width modulation mode and modulus, digital-to-analogue conversion be by the chip microcontroller of mixed signal type.
3. the method for control ink jet precision of piezoelectric type int jet printing head according to claim 1 and 2, it is characterized in that described control voltage is read in by another road analog-to-digital conversion of CPU (8) after sampling, as value of feedback, compare with a reference value, press fiducial value and adjust the dutycycle of pwm generator, thereby find the pulse width modulated wave of a suitable duty ratio, output meets sets the voltage that requires.
4. the method for control ink jet precision of piezoelectric type int jet printing head according to claim 1 and 2, it is characterized in that of the filtering of described pulse width modulated wave through the amplification of switching tube Q and inductance, electric capacity, and information of voltage is fed back to CPU by sample circuit, CPU constantly adjusts the dutycycle of pulse width modulated wave, and output voltage can not changed because of load variations.
5. the method for control ink jet precision of piezoelectric type int jet printing head according to claim 3, it is characterized in that of the filtering of described pulse width modulated wave through the amplification of switching tube Q and inductance, electric capacity, and information of voltage is fed back to CPU (8) by sample circuit, CPU constantly adjusts the dutycycle of pulse width modulated wave, and output voltage can not changed because of load variations.
6. device of controlling ink jet precision of piezoelectric type int jet printing head, comprise the interface board (3) that printhead, temperature sensor and data wire join, it is characterized in that described temperature sensor is arranged in the printhead (1), is provided with voltage adjusting device (4) near described printhead (1); Transport to voltage adjusting device (4) by the signal that temperature sensor obtains, the CPU in it constantly adjusts the dutycycle of pulse width modulated wave, imports suitable driving voltage with closed-loop structure to printhead (1).
7. the device of control ink jet precision of piezoelectric type int jet printing head according to claim 6, it is characterized in that changing through A/D by the detection signal that temperature sensor is obtained, the computation of table lookup magnitude of voltage, compare with a reference value, and meet the power output of setting requirement by the modulation generator output of adjusting pulsewidth; By sample circuit information of voltage is fed back to CPU, realize that in CPU (8) signal carries out A/D and changes and compare with a reference value.
8. according to the device of claim 6 or 7 described control ink jet precision of piezoelectric type int jet printing head, it is characterized in that described voltage adjusting device (4) is the single-chip microcomputer of a mixed signal type, and adopt the structure of paster encapsulation that it is installed on the interface board (3) of each printhead (1) independently.
9. according to the device of claim 6 or 7 described control ink jet precision of piezoelectric type int jet printing head, it is characterized in that described pulse width modulated wave amplifies through switching tube Q, and the filtering of inductance and inductance L, capacitor C, diode D afterflow, and the sample circuit of forming by resistance R 1 and resistance R 2 feedback actual output voltage, the required driving voltage of control printhead work, its magnitude of voltage is 15V-35V.
10. the device of control ink jet precision of piezoelectric type int jet printing head according to claim 8, it is characterized in that described pulse width modulated wave amplifies through switching tube Q, and the filtering of inductance and inductance L, capacitor C, diode D afterflow, and the sample circuit of forming by resistance R 1 and resistance R 2 feedback actual output voltage, the required driving voltage of control printhead work, its magnitude of voltage is 15V-35V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021369852A CN1481992A (en) | 2002-09-12 | 2002-09-12 | Method and apparatus for controlling the ink jet precision of piezoelectric type int jet printing head |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021369852A CN1481992A (en) | 2002-09-12 | 2002-09-12 | Method and apparatus for controlling the ink jet precision of piezoelectric type int jet printing head |
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| CN1481992A true CN1481992A (en) | 2004-03-17 |
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| CNA021369852A Pending CN1481992A (en) | 2002-09-12 | 2002-09-12 | Method and apparatus for controlling the ink jet precision of piezoelectric type int jet printing head |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102262411A (en) * | 2010-05-26 | 2011-11-30 | 北大方正集团有限公司 | Method and device of accurately controlling voltage |
| CN104842668A (en) * | 2015-06-11 | 2015-08-19 | 上海威侃电子材料有限公司 | Control method for printing system |
| CN113276554A (en) * | 2020-01-31 | 2021-08-20 | 株式会社御牧工程 | Ink jet printer and control method of ink jet printer |
-
2002
- 2002-09-12 CN CNA021369852A patent/CN1481992A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102262411A (en) * | 2010-05-26 | 2011-11-30 | 北大方正集团有限公司 | Method and device of accurately controlling voltage |
| CN102262411B (en) * | 2010-05-26 | 2013-09-18 | 北大方正集团有限公司 | Method and device of accurately controlling voltage |
| CN104842668A (en) * | 2015-06-11 | 2015-08-19 | 上海威侃电子材料有限公司 | Control method for printing system |
| CN104842668B (en) * | 2015-06-11 | 2017-03-01 | 上海威侃电子材料有限公司 | A kind of print system control method |
| CN113276554A (en) * | 2020-01-31 | 2021-08-20 | 株式会社御牧工程 | Ink jet printer and control method of ink jet printer |
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