CN115230324B - Piezoelectric type ink jet nozzle and ink jet printer - Google Patents
Piezoelectric type ink jet nozzle and ink jet printer Download PDFInfo
- Publication number
- CN115230324B CN115230324B CN202210724783.2A CN202210724783A CN115230324B CN 115230324 B CN115230324 B CN 115230324B CN 202210724783 A CN202210724783 A CN 202210724783A CN 115230324 B CN115230324 B CN 115230324B
- Authority
- CN
- China
- Prior art keywords
- piezoelectric element
- ink
- resistance strain
- piezoelectric
- strain gauge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 claims abstract description 95
- 239000007921 spray Substances 0.000 claims abstract description 41
- 230000008859 change Effects 0.000 claims description 11
- 239000011247 coating layer Substances 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 14
- 238000007689 inspection Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 description 8
- 239000000919 ceramic Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- CLOMYZFHNHFSIQ-UHFFFAOYSA-N clonixin Chemical compound CC1=C(Cl)C=CC=C1NC1=NC=CC=C1C(O)=O CLOMYZFHNHFSIQ-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2/14201—Structure of print heads with piezoelectric elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
Landscapes
- Ink Jet (AREA)
Abstract
The application discloses a piezoelectric type ink jet nozzle and an ink jet printer, and belongs to the technical field of ink jet printers. The spray head comprises a plurality of ink jet cavities; each ink-jet cavity at least comprises a piezoelectric element, at least one of the inner wall of the ink-jet cavity and the outer wall of the ink-jet cavity facing away from the piezoelectric element is provided with a resistance strain gauge, and the resistance strain gauge is electrically insulated from the piezoelectric element. The shower nozzle that this application provided has solved unable quick accurate shower nozzle trouble of confirming, and then can't be quick and effectual problem of handling the trouble, and this piezoelectric type inkjet shower nozzle is from the detection structure of taking piezoelectric element deformation, can confirm the trouble reason that the shower nozzle does not spout ink through detecting piezoelectric element's deformation to can realize the quick automated inspection of shower nozzle trouble, can carry out quick maintenance according to this trouble detection result, thereby can improve printing equipment's work and maintenance efficiency.
Description
Technical Field
The application belongs to the technical field of ink-jet printers, and particularly relates to a piezoelectric type ink-jet nozzle and an ink-jet printer.
Background
The nozzle of the existing piezoelectric ink-jet printer generally applies voltage to the piezoelectric ceramic through a driving circuit to deform the piezoelectric ceramic, so that the ink in the ceramic cavity is compressed and sprayed out through the nozzle. In the actual printing process, the inkjet nozzles are easy to break down, wherein the most common break down is that the nozzles do not eject ink, and the following three reasons are mainly: 1) The ink channel is blocked, and the reason for this is that the ink is adsorbed on the inner filter screen or the wall of the ink channel, so that the cross-sectional area of the ink flow is reduced to prevent the nozzle from discharging ink; 2) Air bubbles are arranged in the ink channel, and air is mixed in the ink channel to cause the ink channel; 3) Circuit faults, typically caused by unstable drive voltages, or by wire breaks.
At present, the fault treatment of the nozzle without ink jet generally adopts the treatment step of dredging the ink channel so as to remove whether the ink channel is blocked or has bubble faults, and then whether a circuit is in fault is determined, so that the specific cause of the fault cannot be accurately and rapidly determined, and the fault cannot be rapidly and effectively treated.
Disclosure of Invention
This application is through providing a piezoelectricity type inkjet shower nozzle and inkjet printer to solve and to confirm shower nozzle trouble fast accurately, and then can't be fast and effectual problem of handling the trouble, this piezoelectricity type inkjet shower nozzle is from the detection structure who takes piezoelectric element deformation, can confirm the trouble reason that the shower nozzle does not jet ink through detecting piezoelectric element's deformation, thereby can realize the quick automated inspection of shower nozzle trouble, can carry out quick maintenance according to this trouble detection result, thereby can improve printing equipment's work and maintenance efficiency.
In order to achieve the above purpose, the present application mainly provides the following technical solutions:
the application provides a piezoelectric type ink jet nozzle, which comprises a plurality of ink jet cavities; each ink-jet cavity at least comprises a piezoelectric element, at least one of the inner wall of the ink-jet cavity and the outer wall of the ink-jet cavity facing away from the piezoelectric element is provided with a resistance strain gauge, and the resistance strain gauge is electrically insulated from the piezoelectric element.
Preferably, the spray head further comprises an electrode, a first flexible printed circuit board, a driving chip and a detection circuit;
a first printed circuit is arranged on the first flexible printed circuit board; the electrode is arranged on at least one position of the inner wall of the piezoelectric element in the ink-jet cavity and the outer wall of the piezoelectric element back to the ink-jet cavity, and is electrically connected with the driving chip through the first printed circuit; the driving chip is provided with a driving circuit which is used for applying driving voltage to the piezoelectric element so as to deform the piezoelectric element;
the wall surface of the piezoelectric element provided with the resistance strain gauge is provided with two groups of electric connectors, and the two groups of electric connectors are used for electrically connecting the two ends of the resistance strain gauge with the detection circuit and are electrically insulated from the electrode; the detection circuit is used for detecting resistance change of the resistance strain gauge when the resistance strain gauge deforms.
Preferably, the detection circuit is disposed on the driving chip.
Preferably, the spray head further comprises a detection chip, and the detection circuit is arranged on the detection chip.
Preferably, the first flexible printed circuit board is further provided with a second printed circuit, and the two groups of electric connectors are electrically connected with the detection circuit through the second printed circuit.
Preferably, the spray head further comprises a second flexible printed circuit board, the second flexible printed circuit board is provided with a third printed circuit, and the two groups of electric connectors are electrically connected with the detection circuit through the third printed circuit.
Preferably, the detection circuit comprises a Wheatstone bridge circuit electrically connected with two ends of the resistance strain gauge, and a filter circuit, an amplifying circuit and an ADC acquisition circuit which are sequentially and electrically connected with the output end of the Wheatstone bridge circuit.
Preferably, a plurality of resistance strain gauges in the plurality of ink jet cavities are connected with the same detection circuit, and the detection circuit adopts a Wheatstone bridge circuit for detecting by polling an analog switch.
Preferably, the inner wall of the piezoelectric element in the ink-jet cavity and the outer wall of the piezoelectric element back to the ink-jet cavity are both provided with resistance strain gauges.
Preferably, at least one of the inner wall of the ink-jet cavity and the outer wall of the ink-jet cavity facing away from the piezoelectric element is provided with a plurality of groups of parallel resistance strain gauges.
Preferably, the resistive strain gauge is a resistive strain film.
Preferably, the spray head further comprises a controller; the controller is used for receiving the detection data output by the detection circuit and judging the reason of the fault of the spray head according to the detection data.
The application also provides an ink-jet printer which is provided with the piezoelectric ink-jet nozzle.
One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
according to the detection structure for deformation of the built-in piezoelectric element on the ink jet nozzle, the failure reason that the nozzle does not jet ink can be determined by detecting the deformation of the piezoelectric element, the rapid automatic detection of the nozzle failure can be realized, the rapid maintenance can be performed according to the failure detection result, and therefore the working and maintenance efficiency of the printing equipment can be improved. The resistor strain gauge is arranged on the piezoelectric element of the spray head, is suitable for most of spray head structures, can realize the self-fault detection function of the spray head on the basis of not changing the structural design of the existing spray head, greatly reduces the maintenance difficulty of the spray head in the use process, and improves the working efficiency of the spray head.
Drawings
FIG. 1 is a front view of a piezoelectric ink jet head according to an embodiment of the present disclosure;
FIG. 2 is a top view of a piezoelectric inkjet printhead according to an embodiment of the present disclosure;
FIG. 3 is a front view of a piezoelectric ink jet head according to another embodiment of the present disclosure;
FIG. 4 is a top view of a piezoelectric inkjet printhead according to another embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a Wheatstone bridge circuit provided in an embodiment of the present application;
FIG. 6 is a schematic diagram of a filter amplifier circuit connected by a Wheatstone bridge circuit according to an embodiment of the present application;
fig. 7 is a schematic diagram of a wheatstone bridge circuit for analog switch polling detection according to an embodiment of the present application.
Detailed Description
In order to further describe the technical means and effects adopted by the present application for achieving the purpose of the predetermined application, the following detailed description refers to the specific implementation, structure, characteristics and effects according to the present application with reference to the accompanying drawings and preferred embodiments.
It should be noted that, different "an embodiment" or "an embodiment" in this application does not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner. It should be understood that the examples are illustrative of the embodiments of the present application and are not intended to limit the scope of the present application.
The most common failure of piezoelectric inkjet nozzles is that the nozzles are not ejecting ink, which is generally caused by blockage of ink channels, bubbles in the ink channels, or circuit failure. When the fault that the nozzle does not jet ink is generated, the processing step of dredging the ink channel is generally adopted firstly, the fault that the ink channel is blocked or has bubbles is removed by cleaning the ink channel, and when the fault still exists after the ink channel is dredged, whether the circuit fault or other faults exist is determined, so that the fault processing efficiency is low and the fault can not be processed effectively.
To above-mentioned problem, this application is through providing a piezoelectricity inkjet nozzle and inkjet printer to solve and to confirm nozzle fault cause fast and accurately, and then can't be fast and effectual carry out the problem of handling the trouble. According to the detection structure for deformation of the built-in piezoelectric element on the ink jet nozzle, the failure reason that the nozzle does not jet ink can be determined by detecting the deformation of the piezoelectric element, the rapid automatic detection of the nozzle failure can be realized, the rapid maintenance can be performed according to the failure detection result, and therefore the working and maintenance efficiency of the printing equipment can be improved.
The technical scheme in the embodiment of the application aims to solve the problems, and the overall thought is as follows:
the embodiment of the application provides a piezoelectric type ink jet nozzle, the nozzle comprises a plurality of ink jet cavities, each ink jet cavity at least comprises a piezoelectric element, the piezoelectric element is located on at least one of the inner wall of the ink jet cavity and the outer wall of the back ink jet cavity, and a resistance strain gauge is arranged on at least one of the inner wall of the ink jet cavity and the outer wall of the back ink jet cavity and is electrically insulated from the piezoelectric element.
According to the application, the resistance strain gauge is arranged on the piezoelectric element of the spray head, so that the deformation of the piezoelectric element during ink spraying of the spray head can be detected. When the driving circuit applies specific voltage to the piezoelectric element to deform, the same deformation is correspondingly generated on the resistance strain gauge, the resistance of the resistance strain gauge can change according to different deformation sizes, the deformation size of the resistance strain gauge can be obtained by detecting the resistance change of the resistance strain gauge, and then the deformation size of the piezoelectric element is obtained.
When the nozzle jet is abnormal, such as the nozzle does not jet ink or the nozzle jet ink does not meet the specified requirement, the specific reason of the nozzle fault can be judged by detecting whether the deformation of the piezoelectric element is normal. If the circuit is not open or damaged, the piezoelectric element is not deformed, and the nozzle is not ejected; the excessive deformation of the piezoelectric element is caused by the damage of the piezoelectric element; the piezoelectric element deforms normally but the nozzle does not eject ink, and in the normal case of an ink supply system, the ink is caused by ink channel blockage or air bubbles in the ink channel. Therefore, when the sprayer fails, the deformation of the piezoelectric element is detected through the self-contained strain detection structure, so that the fault reason of the sprayer can be rapidly and accurately positioned, rapid online maintenance can be realized on the basis, and the fault processing efficiency is improved. The resistor strain gauge is arranged on the piezoelectric element of the spray head, is suitable for most of spray head structures, can realize the self-fault detection function of the spray head on the basis of not changing the structural design of the existing spray head, greatly reduces the maintenance difficulty of the spray head in the use process, and improves the working efficiency of the spray head.
Specifically, the piezoelectric element in the nozzle is a piezoelectric ceramic. And a resistance strain gauge is arranged on the piezoelectric element in each ink-jet cavity, and whether the deformation of the piezoelectric element in each ink-jet cavity is normal or not is detected. When the nozzle has abnormal ink jet, the position and the reason of the fault can be accurately positioned by detecting the deformation of the piezoelectric element of each ink jet cavity, so that the fault is processed in a targeted manner, and the fault processing efficiency is improved.
As the preferred mode of the embodiment of the application, the resistance strain gauge is arranged in the area where the piezoelectric element generates maximum deformation displacement, and the maximum deformation of the piezoelectric element can be detected through the resistance strain gauge, so that the accuracy of deformation detection is ensured. The resistance strain gauge can be arranged on the inner wall of the piezoelectric element, which is positioned in the ink-jet cavity, on the outer wall of the piezoelectric element, which is back to the ink-jet cavity, or on the inner wall and the outer wall of the piezoelectric element.
When the strain of the piezoelectric element is detected by the resistance strain gauge, the resistance change of the resistance strain gauge needs to be detected by the detection circuit, and therefore, electrical insulation needs to be maintained between the resistance strain gauge and the piezoelectric element and between the resistance strain gauge and the ink. Specifically, an insulating medium may be disposed between the resistance strain gauge and the piezoelectric element, and an insulating medium may be disposed on a surface of the resistance strain gauge that contacts the ink. In addition, an insulating coating layer can be arranged outside the resistance strain gauge so as to isolate the resistance strain gauge from the piezoelectric element, ink in the ink jet cavity or other structures of the nozzle, and the resistance measurement of the resistance strain gauge is prevented from being influenced.
Specifically, the spray head further comprises an electrode, a first flexible printed circuit board, a driving chip and a detection circuit; a first printed circuit is arranged on the first flexible printed circuit board; the electrode is arranged on at least one part of the inner wall of the piezoelectric element in the ink-jet cavity and the outer wall of the piezoelectric element back to the ink-jet cavity and is electrically connected with the driving chip through the first printed circuit; the driving chip is provided with a driving circuit which is used for applying driving voltage to the piezoelectric element so as to deform the piezoelectric element; the wall surface of the piezoelectric element provided with the resistance strain gauge is provided with two groups of electric connectors, and the two groups of electric connectors are used for electrically connecting the two ends of the resistance strain gauge with the detection circuit and are electrically insulated from the electrode; the detection circuit is used for detecting resistance change of the resistance strain gauge when the resistance strain gauge deforms.
The present embodiment provides a piezoelectric type inkjet head, as shown in fig. 1 and 2, which includes a plurality of inkjet chambers 1, each inkjet chamber 1 being formed by a piezoelectric element 2 at the top, a nozzle plate 4 at the bottom, and a substrate or cover plate 5 at the side; the nozzle plate is provided with a nozzle 41 and the base plate or cover plate may be provided with an ink inlet. The first flexible printed circuit board may be adhered to the substrate or the cover plate, and the first flexible printed circuit board is provided with a first printed circuit thereon. An electrode is arranged on the inner wall of the piezoelectric element in the ink-jet cavity or the outer wall of the piezoelectric element back to the ink-jet cavity, and is electrically connected with the driving chip through a first printed circuit. The resistance strain gauge can be arranged on the inner wall of the piezoelectric element in the ink jet cavity or the outer wall facing away from the ink jet cavity, or the resistance strain gauge can be arranged on the inner wall of the piezoelectric element in the ink jet cavity and the outer wall facing away from the ink jet cavity at the same time. Two groups of electric connectors which are respectively connected with two ends of the resistance strain gauge are arranged on the wall surface of the piezoelectric element provided with the resistance strain gauge and are used for electrically connecting the corresponding resistance strain gauge with the detection circuit.
The embodiment of the application also provides another piezoelectric type ink jet nozzle, as shown in fig. 3 and 4, the nozzle is a shared wall type nozzle, and comprises a plurality of ink jet cavities 1, wherein each ink jet cavity 1 is formed by two adjacent piezoelectric elements 2, a nozzle plate 4, a substrate or a cover plate 5; wherein the nozzle plate 4 is positioned at the bottom of the ink-jet cavity, adjacent piezoelectric elements form two sides of the ink-jet cavity, the base plate or the cover plate form the other two sides of the ink-jet cavity, and the top of the ink-jet cavity can be the base plate or the cover plate; the nozzle plate is provided with a nozzle 41 and the base plate or cover plate may be provided with an ink inlet. The first flexible printed circuit board may be adhered to a substrate or cover plate on a side or top surface, and the first flexible printed circuit board is provided with a first printed circuit thereon. In the nozzle, the inner side wall of the piezoelectric element in the ink-jet cavity and the outer side wall of the piezoelectric element back to the ink-jet cavity are respectively provided with an electrode 6, and the electrodes are electrically connected with the driving chip through a first printed circuit. In the nozzle, the piezoelectric elements at two ends include an inner side wall located in the ink-jet cavity and an outer side wall facing away from the ink-jet cavity, and two side wall surfaces of the other piezoelectric elements are both inner side walls located in the ink-jet cavity. The resistance strain gauge 3 is provided on either or both of the inner and outer side walls of the piezoelectric element, and electrical connectors 7 connected to both ends of the resistance strain gauge are provided for electrically connecting the corresponding resistance strain gauge to the detection circuit.
In particular, the electrodes and electrical contacts on the same side wall of the piezoelectric element need to remain electrically isolated. In particular, the electrodes and electrical contacts may be provided on the side walls of the piezoelectric element in the form of metal plating.
As a preferred mode of the embodiment of the present application, the detection circuit is located on the driving chip. Through this setting, set up detection circuitry and drive circuit simultaneously on the drive chip, can improve the integrated density of shower nozzle subassembly, reduce the size of shower nozzle subassembly integrated package.
As a preferred mode of the embodiment of the application, the spray head further comprises a detection chip, and the detection circuit is located on the detection chip. By arranging the independent carrier chip on the detection circuit, when the driving circuit or the detection circuit fails, the failure detection and maintenance of the driving circuit or the detection circuit are not interfered with each other, and the failure cause can be conveniently and timely determined.
As a preferred mode of the embodiment of the present application, the first flexible printed circuit board is further provided with a second printed circuit, and the two sets of electrical connectors are electrically connected with the detection circuit through the second printed circuit. Through the arrangement, the electrical connection channels of the piezoelectric element and the resistance strain gauge can be all integrated on the same flexible printed circuit board, so that the integration density of the spray head assembly can be improved, and the size of the integrated package of the spray head assembly can be reduced.
As a preferred mode of the embodiment of the present application, the above-mentioned spray head further includes a second flexible printed circuit board, the second flexible printed circuit board is provided with a third printed circuit, and the two sets of electrical connectors are electrically connected with the detection circuit through the third printed circuit. Through the arrangement, when the detection circuit or the driving circuit breaks down, the fault detection and the maintenance of the detection circuit or the driving circuit are not interfered with each other, and the detection circuit or the driving circuit can be maintained or replaced independently.
Specifically, the detection circuit comprises a Wheatstone bridge circuit electrically connected with two ends of the resistance strain gauge, and a filter circuit, an amplifying circuit and an ADC acquisition circuit which are sequentially and electrically connected with the output end of the Wheatstone bridge circuit. The Wheatstone bridge circuit is used for converting a resistance change value generated by deformation of the resistance strain gauge into a voltage value and outputting the voltage value. The electric signal output by the Wheatstone bridge circuit is subjected to pre-stage filtering by the filtering circuit and then amplified by the amplifying circuit, so that the accuracy and stability of the output voltage value can be improved. The ADC acquisition circuit is used for acquiring the detected voltage value and transmitting the voltage value to the controller.
Specifically, as shown in fig. 5, the wheatstone bridge circuit is shown, wherein R1 in the first bridge arm is a resistance strain gauge, and R2, R3 and R4 in the other three bridge arms are all fixed resistors, and the resistance values of the three fixed resistors are equal to the initial resistance value when the resistance strain gauge is not deformed. When the resistance strain gauge R1 is not deformed, there is no resistance change, and the bridge maintains r1.r4=r2.r3 in the initial balance condition, so the output voltage is zero, i.e. uout=a (rl.r4-r2.r3) =0; when the resistance strain gauge R1 deforms, the resistance change DeltaR 1 is generated, the bridge is in an unbalanced state, and the output voltage is proportional to the resistance change DeltaR 1 generated when the resistance strain gauge deforms.
In particular, the amplifying circuit may employ an instrumentation amplifier with very low dc offset, low drift, low noise, very high open loop gain, very large common mode rejection ratio, high input impedance. The filter amplifying circuit connected with the Wheatstone bridge circuit is shown in fig. 6, wherein R1 in the first bridge arm is a resistance strain gauge, and the amplification factor of the output voltage can be adjusted by adjusting R7.
Specifically, each resistance strain gauge may be provided with a separate detection circuit, or resistance strain gauges in a plurality of ink ejection chambers may be connected to the same detection circuit. As shown in fig. 7, when the resistance strain gauges 3 in the multiple ink-jet chambers are connected to the same detection circuit 8, the detection circuit uses the wheatstone bridge circuit for polling detection by the analog switch, and since the number of the ink-jet chambers of the nozzle is generally large, such as 128, 256, 512 or 1024, when the wheatstone bridge circuit is provided for each resistance strain gauge in each ink-jet chamber, the circuit is complicated, and the manufacturing cost can be reduced by using the wheatstone bridge circuit for polling detection by the analog switch.
As a preferred mode of the embodiment of the application, the inner wall of the piezoelectric element in the ink-jet cavity and the outer wall facing away from the ink-jet cavity are both provided with resistance strain gauges. Through this setting, can adopt two sets of resistance strain gages on piezoelectric element inner wall and the outer wall to detect piezoelectric element's deformation simultaneously, synthesize these two sets of detection data and can improve deformation detection's accuracy for fault judgement is more effective reliable.
Multiple groups of resistance strain gauges can be arranged in different areas of the same wall surface of the piezoelectric element, and then multiple groups of detection data are comprehensively processed, so that more accurate detection data can be obtained, and the reliability of deformation detection is improved. Preferably, at least one of the inner wall of the piezoelectric element in the ink-jet cavity and the outer wall of the piezoelectric element facing away from the ink-jet cavity is provided with a plurality of groups of parallel resistance strain gauges, specifically, a plurality of groups of resistance strain gauges can be arranged in a symmetrical deformation area of the piezoelectric element, so that the accuracy and the reliability of deformation detection data can be further improved.
As a preferred mode of the embodiment of the present application, the resistive strain gauge is a resistive strain film. The resistance strain film can be tightly attached to the piezoelectric element, so that the deformation of the resistance strain film is consistent with the deformation of the piezoelectric ceramic, and the deformation of the piezoelectric element can be accurately obtained by detecting the deformation of the resistance strain film. Specifically, the resistance strain film may be a metal plating deposited by dip plating, electroplating, or the like, or a metal film layer formed by printing. The size of the resistance strain gage can be adjusted according to the specifications of the load cell.
Specifically, the spray head further comprises a controller; the controller is used for receiving the detection data output by the detection circuit and judging the reason of the fault of the spray head according to the detection data. Specifically, the controller may determine the cause of the failure of the spray head according to the following determination rule: when the deformation of the piezoelectric element is within a preset threshold value range, judging that ink channel blockage or bubble faults exist; when the deformation of the piezoelectric element is larger than the upper limit of the preset threshold value, judging that a fault of damage of the piezoelectric element exists; when the deformation size of the piezoelectric element is smaller than the lower limit of the preset threshold, after the driving voltage of the piezoelectric element is increased, if the deformation size of the piezoelectric element falls into the preset threshold range, the fault that the driving voltage of the printing operation is smaller is judged, and if the deformation size of the piezoelectric element is still smaller than the lower limit of the preset threshold, the fault that the circuit is damaged is judged.
Specifically, the detection circuit converts the resistance change of the resistance strain gauge into a voltage value and transmits the voltage value to the controller, and the voltage value and the piezoelectric element obtained by the detection circuit collecting the deformation of the piezoelectric elementThe deformation of the piece is in direct proportion, and the voltage value acquired by the detection circuit can be directly compared by setting a reasonable comparison threshold value in the controller. The cause of the failure of the nozzle can be determined according to the judgment conditions of the following Table 1, in which V f1 To detect the processed and amplified variable of the electric signal, N c1 For comparison of the threshold values, U is an error constant, and the value of U can be calculated according to the detection amplifying circuit.
TABLE 1 judging conditions for nozzle failure
| Judgment condition | Judgment result |
| V f1 ＜N c1 -U | The deformation of the piezoelectric element is smaller, and the circuit damage fault is determined |
| N c1 -U≤V f1 ≤N c1 +U | The deformation of the piezoelectric element is normal, and the ink channel is judged to be blocked or has bubble faults |
| V f1 ＞N c1 +U | The deformation of the piezoelectric element is larger, and the failure of the piezoelectric element is determined |
After the reason of the fault of the spray head is determined by detecting the deformation of the piezoelectric element, the targeted fault treatment can be performed. After the deformation of the piezoelectric elements of the ink jet cavities is detected, the situation that a part of channels corresponding to the ink jet cavities are blocked or have bubbles, a part of ink jet cavities have faults of damaging the piezoelectric elements and a part of ink jet cavities have faults of damaging circuits may occur. When the fault reasons of the spray head comprise that the piezoelectric element is damaged or the circuit is damaged, the spray head can be directly replaced to eliminate the fault, and the ink-jet cavity with the blocked ink channel or the air bubble is not required to be dredged. When the failure cause of the spray head is only ink channel blockage or air bubble, the failure can be eliminated after the ink channel dredging treatment. When deformation of the piezoelectric element is detected, channels with ink channel blockage or bubbles can be recorded, and only the channels are dredged when the ink channel dredging treatment is carried out, so that fault treatment efficiency is improved. The ink channel dredging treatment can be performed by applying an increased driving voltage to the piezoelectric element to squeeze the blocked ink channel, or by flushing the ink channel with a cleaning liquid.
When the deformation of the piezoelectric element is smaller than the lower limit of the preset threshold, the driving voltage of the piezoelectric element can be increased for a plurality of times, so that the situation that the deformation of the piezoelectric element cannot reach the preset threshold due to insufficient driving voltage is eliminated, and the number of times for increasing the driving voltage of the piezoelectric element can be set according to practical situations. Specifically, the driving voltage of deformation detection is increased for the first time, if the deformation size of the piezoelectric element falls within the preset threshold range at this time, the fault that the driving voltage of the printing operation is smaller is judged, if the deformation size of the piezoelectric element is still smaller than the lower limit of the preset threshold, whether the number of times of increasing the driving voltage of deformation detection is zero clearing is judged, and when the number of times of increasing the driving voltage of deformation detection is not zero clearing, the driving voltage of deformation detection is further increased, and repeated judgment is carried out on the deformation size of the piezoelectric element; when the deformation of the piezoelectric element is still smaller than the lower limit of the preset threshold value and the increase frequency of the driving voltage is zero, the fault of circuit damage is judged. When the nozzle does not need to be replaced, aiming at a channel with a small driving voltage of the printing operation, the driving voltage of the printing operation is increased to enable the deformation of the piezoelectric element to fall into a preset threshold range.
Specifically, the controller is further used for determining a fault treatment scheme according to the reason that the spray head breaks down: when the deformation of the piezoelectric elements of the ink jet cavities is detected, a prompt for replacing a spray head is sent out when the piezoelectric elements or circuits are damaged in the fault reasons, and a prompt for dredging the ink channel is sent out when the piezoelectric elements or circuits are not damaged in the fault reasons but the ink channel is blocked or has bubbles; when the driving voltage including the print job is smaller than the driving voltage including no piezoelectric element damage or circuit damage among the failure causes, an instruction to increase the driving voltage of the print job is sent to the driving chip so that the deformation size of the piezoelectric element falls within a preset threshold range.
Specifically, the controller is further configured to transmit the deformation size of the piezoelectric element, the fault cause determined according to the deformation size, the positioning information of the fault channel, the fault processing scheme, the fault processing state, and the like to the memory of the inkjet printer for storage, and display the deformation size on the display screen of the inkjet printer for the user to view. The controller can exchange data and transmit control commands through the IO interface, the driving circuit and the detection circuit, the touch screen is communicated with the controller through the RS232 interface, and the memory and the controller transmit data through the data bus. The controller is communicated with the PC computer through the USB interface, a user can send a fault detection instruction to the controller through the PC computer, and the controller can also transmit fault detection data, fault processing states, fault processing results and other data to the PC computer for storage and display.
The application also provides an inkjet printer, this inkjet printer has above-mentioned piezoelectricity type inkjet shower nozzle, after adopting this shower nozzle, the inkjet printer can be when the shower nozzle breaks down by oneself to fault detection and show the testing result on the display screen of printer or on the PC computer that is connected with the printer to for the user looks over, thereby can improve the work and the maintenance efficiency of printer.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application, and all such modifications are intended to be encompassed within the scope of the claims of the present application.
Claims (13)
1. A piezoelectric type ink jet nozzle is characterized in that,
the spray head comprises a plurality of ink jet cavities; each ink-jet cavity at least comprises a piezoelectric element, wherein at least one part of the inner wall of the piezoelectric element positioned in the ink-jet cavity and the outer wall of the piezoelectric element facing away from the ink-jet cavity is provided with a resistance strain gauge, and the resistance strain gauge is electrically insulated from the piezoelectric element;
the resistance strain gauge is arranged in the area where the piezoelectric element generates maximum deformation displacement;
an insulating coating layer is arranged outside the resistance strain gauge so as to isolate the resistance strain gauge from the piezoelectric element, the ink in the ink-jet cavity or other structures of the spray head;
when the nozzle failure is determined:
when the deformation of the piezoelectric element is smaller, judging that the circuit is damaged;
when the deformation of the piezoelectric element is normal, judging that the ink channel is blocked or has a bubble fault;
when the deformation of the piezoelectric element is large, judging that the piezoelectric element is damaged;
when the deformation of the piezoelectric element is within a preset threshold value range, judging that the ink channel is blocked or the bubble exists; when the deformation of the piezoelectric element is larger than the upper limit of the preset threshold value, judging that a fault of damage of the piezoelectric element exists; when the deformation size of the piezoelectric element is smaller than the lower limit of the preset threshold, after the driving voltage of the piezoelectric element is increased, if the deformation size of the piezoelectric element falls into the preset threshold range, the fault that the driving voltage of the printing operation is smaller is judged, and if the deformation size of the piezoelectric element is still smaller than the lower limit of the preset threshold, the fault that the circuit is damaged is judged.
2. The piezoelectric inkjet head of claim 1, wherein,
the spray head also comprises an electrode, a first flexible printed circuit board, a driving chip and a detection circuit;
a first printed circuit is arranged on the first flexible printed circuit board; the electrode is arranged on at least one position of the inner wall of the piezoelectric element in the ink-jet cavity and the outer wall of the piezoelectric element back to the ink-jet cavity, and is electrically connected with the driving chip through the first printed circuit; the driving chip is provided with a driving circuit which is used for applying driving voltage to the piezoelectric element so as to deform the piezoelectric element;
the wall surface of the piezoelectric element provided with the resistance strain gauge is provided with two groups of electric connectors, and the two groups of electric connectors are used for electrically connecting the two ends of the resistance strain gauge with the detection circuit and are electrically insulated from the electrode; the detection circuit is used for detecting resistance change of the resistance strain gauge when the resistance strain gauge deforms.
3. The piezoelectric inkjet head of claim 2, wherein,
the detection circuit is arranged on the driving chip.
4. The piezoelectric inkjet head of claim 2, wherein,
the spray head further comprises a detection chip, and the detection circuit is arranged on the detection chip.
5. The piezoelectric inkjet head of claim 2, wherein,
the first flexible printed circuit board is also provided with a second printed circuit, and the two groups of electric joints are electrically connected with the detection circuit through the second printed circuit.
6. The piezoelectric inkjet head of claim 2, wherein,
the spray head further comprises a second flexible printed circuit board, a third printed circuit is arranged on the second flexible printed circuit board, and the two groups of electric connectors are electrically connected with the detection circuit through the third printed circuit.
7. The piezoelectric inkjet head of claim 2, wherein,
the detection circuit comprises a Wheatstone bridge circuit electrically connected with two ends of the resistance strain gauge, and a filter circuit, an amplifying circuit and an ADC acquisition circuit which are sequentially and electrically connected with the output end of the Wheatstone bridge circuit.
8. The piezoelectric inkjet head of claim 7, wherein,
and a plurality of resistance strain gauges in the ink jet cavities are connected with the same detection circuit, and the detection circuit adopts a Wheatstone bridge circuit for polling detection by an analog switch.
9. The piezoelectric inkjet head of claim 1, wherein,
and the inner wall of the piezoelectric element in the ink-jet cavity and the outer wall of the piezoelectric element back to the ink-jet cavity are both provided with resistance strain gauges.
10. The piezoelectric inkjet head of claim 1, wherein,
at least one of the inner wall of the piezoelectric element in the ink-jet cavity and the outer wall of the piezoelectric element back to the ink-jet cavity is provided with a plurality of groups of parallel resistance strain gauges.
11. The piezoelectric inkjet head of claim 1, wherein,
the resistance strain gauge is a resistance strain film.
12. The piezoelectric inkjet head of claim 2, wherein,
the spray head also comprises a controller; the controller is used for receiving the detection data output by the detection circuit and judging the reason of the fault of the spray head according to the detection data.
13. An ink jet printer, characterized in that,
the ink jet printer having the piezoelectric ink jet head as claimed in any one of claims 1 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210724783.2A CN115230324B (en) | 2022-06-23 | 2022-06-23 | Piezoelectric type ink jet nozzle and ink jet printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210724783.2A CN115230324B (en) | 2022-06-23 | 2022-06-23 | Piezoelectric type ink jet nozzle and ink jet printer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115230324A CN115230324A (en) | 2022-10-25 |
| CN115230324B true CN115230324B (en) | 2024-04-09 |
Family
ID=83669911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210724783.2A Active CN115230324B (en) | 2022-06-23 | 2022-06-23 | Piezoelectric type ink jet nozzle and ink jet printer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115230324B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6375299B1 (en) * | 1998-11-02 | 2002-04-23 | Encad, Inc. | Faulty ink ejector detection in an ink jet printer |
| CN101466464A (en) * | 2006-06-13 | 2009-06-24 | 皇家飞利浦电子股份有限公司 | Ink jet device for producing a biological assay substrate by releasing a plurality of substances onto the substrate, and method for monitoring the ink jet device |
| CN103595292A (en) * | 2013-11-19 | 2014-02-19 | 苏州大学 | Closed-loop-controlled encapsulating piezoelectric ceramic actuator and resistance strain gauge fixing method |
| CN104842663A (en) * | 2014-02-14 | 2015-08-19 | 精工爱普生株式会社 | Liquid discharge device, and discharge abnormality testing method |
| CN105445606A (en) * | 2015-11-12 | 2016-03-30 | 国网重庆市电力公司电力科学研究院 | High-voltage power cable joint fault monitoring method based on deformation measurement |
| CN205523068U (en) * | 2015-11-12 | 2016-08-31 | 北京奥托米特电子有限公司 | Ink jet printer shower nozzle fault detection device and ink jet printer |
| CN207683143U (en) * | 2017-12-13 | 2018-08-03 | 珠海纳思达企业管理有限公司 | Ink-feeding device and ink-jet printer |
-
2022
- 2022-06-23 CN CN202210724783.2A patent/CN115230324B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6375299B1 (en) * | 1998-11-02 | 2002-04-23 | Encad, Inc. | Faulty ink ejector detection in an ink jet printer |
| CN101466464A (en) * | 2006-06-13 | 2009-06-24 | 皇家飞利浦电子股份有限公司 | Ink jet device for producing a biological assay substrate by releasing a plurality of substances onto the substrate, and method for monitoring the ink jet device |
| CN103595292A (en) * | 2013-11-19 | 2014-02-19 | 苏州大学 | Closed-loop-controlled encapsulating piezoelectric ceramic actuator and resistance strain gauge fixing method |
| CN104842663A (en) * | 2014-02-14 | 2015-08-19 | 精工爱普生株式会社 | Liquid discharge device, and discharge abnormality testing method |
| CN105445606A (en) * | 2015-11-12 | 2016-03-30 | 国网重庆市电力公司电力科学研究院 | High-voltage power cable joint fault monitoring method based on deformation measurement |
| CN205523068U (en) * | 2015-11-12 | 2016-08-31 | 北京奥托米特电子有限公司 | Ink jet printer shower nozzle fault detection device and ink jet printer |
| CN207683143U (en) * | 2017-12-13 | 2018-08-03 | 珠海纳思达企业管理有限公司 | Ink-feeding device and ink-jet printer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115230324A (en) | 2022-10-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2588321B1 (en) | Determining whether a flow path is ready for ejecting a drop | |
| JP5978744B2 (en) | Liquid ejection device, inspection method, and program | |
| US8960848B2 (en) | Liquid ejection head, liquid ejection apparatus and abnormality detection method for liquid ejection head | |
| US8029088B2 (en) | Liquid ejecting apparatus and ejection inspecting method | |
| CN205523068U (en) | Ink jet printer shower nozzle fault detection device and ink jet printer | |
| US8991970B2 (en) | Printing device, discharge test device and discharge test method | |
| JP2020508235A (en) | Fluid ejection die including strain gauge sensor | |
| US20110050775A1 (en) | Liquid Ejecting Apparatus And Ejection Inspecting Method | |
| CN115230324B (en) | Piezoelectric type ink jet nozzle and ink jet printer | |
| CN115230350B (en) | Inkjet printer nozzle, fault detection method and fault detection system thereof | |
| US10661560B2 (en) | Liquid discharging apparatus | |
| US8393717B2 (en) | Liquid ejecting head and method of inspecting liquid ejecting head | |
| KR101279813B1 (en) | Method for detecting abnormal nozzle using self-sensing of piezo and recording medium thereof | |
| JP4240125B2 (en) | Inkjet head manufacturing method, inkjet head inspection method, and inkjet recording apparatus | |
| JP2011084043A (en) | Ejection examination apparatus and printing apparatus | |
| US11577505B2 (en) | Print head drive circuit and liquid ejecting apparatus | |
| JP2012143934A (en) | Liquid ejection device | |
| KR20140037303A (en) | Inkjet print head and method for detecting abnormal condition of inkjet print head | |
| US8408670B2 (en) | Discharge inspection apparatus and discharge inspection method | |
| JP2010058406A (en) | Ejection inspecting method and liquid ejecting apparatus | |
| JP2007331192A (en) | Temperature detector and method for controlling the same | |
| EP0771655A2 (en) | Short detection circuit for ink jet printer | |
| JP5083251B2 (en) | Inspection method of power supply system | |
| JP3156770U (en) | Printing device | |
| JP2011079267A (en) | Discharge inspection device and discharge inspection method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |