WO2011018841A1 - インクジェット記録装置、及び印字ヘッド - Google Patents
インクジェット記録装置、及び印字ヘッド Download PDFInfo
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- WO2011018841A1 WO2011018841A1 PCT/JP2009/064170 JP2009064170W WO2011018841A1 WO 2011018841 A1 WO2011018841 A1 WO 2011018841A1 JP 2009064170 W JP2009064170 W JP 2009064170W WO 2011018841 A1 WO2011018841 A1 WO 2011018841A1
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- printing
- nozzles
- charging
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- 238000007639 printing Methods 0.000 title claims abstract description 160
- 239000002245 particle Substances 0.000 claims abstract description 118
- 239000000758 substrate Substances 0.000 claims description 9
- 230000005684 electric field Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000007641 inkjet printing Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 15
- 230000005284 excitation Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 12
- 238000001514 detection method Methods 0.000 description 9
- 230000002950 deficient Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 3
- 239000011295 pitch Substances 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 206010034719 Personality change Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
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Classifications
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- 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
- B41J2/07—Ink jet characterised by jet control
- B41J2/075—Ink jet characterised by jet control for many-valued deflection
- B41J2/08—Ink jet characterised by jet control for many-valued deflection charge-control type
- B41J2/085—Charge means, e.g. electrodes
-
- 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
- B41J2/07—Ink jet characterised by jet control
- B41J2/075—Ink jet characterised by jet control for many-valued deflection
-
- 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
- B41J2/07—Ink jet characterised by jet control
- B41J2/075—Ink jet characterised by jet control for many-valued deflection
- B41J2/08—Ink jet characterised by jet control for many-valued deflection charge-control type
- B41J2/09—Deflection means
-
- 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
- B41J2/07—Ink jet characterised by jet control
- B41J2/075—Ink jet characterised by jet control for many-valued deflection
- B41J2/095—Ink jet characterised by jet control for many-valued deflection electric field-control type
Definitions
- the present invention relates to an ink jet recording apparatus (ink jet printer) and a print head used therefor, for example, an industrial ink jet recording apparatus used for product marking and a print head used therefor.
- ink particles ejected from one nozzle are used when printing on a printing object (also referred to as “work”).
- the charging voltage is applied by regarding the ink particles ejected from one nozzle as a charging target at a ratio of one to a plurality of ink particles.
- the upper part of FIG. 1 shows an example in which one of the two created ink particles is to be charged, and this is defined as a particle usage rate of 1/2.
- the particle usage rate is changed to 1/1.
- the print character width can be controlled by leaving each scan interval.
- the creation cycle of the ink particles ejected from the nozzles is set constant so as to obtain an optimal ink particle shape based on the ink pressure and ink viscosity, etc., and the ink particles are charged and deflected to a predetermined position. It is supposed to be.
- the character width of the printing result tends to increase as the conveyance speed of the printing object increases.
- FIG. 1 shows an example of performing one-step printing.
- Patent Document 1 in the case where two or more stages of printing are performed, two or more nozzles are arranged in a print head, and an ink jet recording apparatus that performs printing corresponding to each nozzle and stage Has been devised.
- the system has a system of charging voltage and deflection voltage according to the number of each nozzle, and in order to reduce the character width of the printing result in high-speed printing when performing multi-stage printing. It is an effective method.
- the particle usage rate used for printing the ink ejected from the nozzle described in the previous stage It is effective to increase the value or to shorten the production cycle of the ink ejected from the nozzles.
- the particle usage rate 1/1 is the limit, and the range that can cope with high speed is limited.
- the latter is a specification that is set in advance so as to obtain an optimal ink particle shape based on ink pressure, ink viscosity, etc., and if only the ink creation cycle is changed, printing defects will occur due to defective ink particle formation. Have a factor that occurs.
- Patent Document 1 realizes printing of two or more stages at a printing speed of one stage. As described above, when the conveyance speed of the substrate is increased, the printing result is The character width cannot be prevented from widening.
- a plurality of nozzles are housed in the print head, and the charging voltage is binarized to charge the ink particles, thereby separating the presence and absence of deflection in the deflection electrode, and the ink particles collected by the gutter
- the charging voltage is binarized to charge the ink particles, thereby separating the presence and absence of deflection in the deflection electrode, and the ink particles collected by the gutter
- the present invention has been made in view of such a situation, and in an ink jet recording apparatus, even when the conveyance speed of an object to be printed is increased, the character width of the printing result is not increased, and the printing quality is improved.
- the technology for improving is provided.
- the present invention is configured so that the arrangement direction of a plurality of nozzles is orthogonal to the deflection direction of ink particles in an ink jet recording apparatus.
- the ink ejected from a plurality of nozzles is charged by the same number of charging electrodes as the nozzles, and each charged particle is deflected in one deflection electric field formed by a pair of positive and negative deflection electrodes, and applied to each charging electrode.
- the voltage value of the charging voltage to be applied and the application timing of the charging voltage are configured to have a function that can be adjusted independently.
- an ink jet recording apparatus is an ink jet recording apparatus that prints on a substrate to be conveyed, and includes a plurality of nozzles, a plurality of charging electrodes, a deflection electrode, an input unit, and a control unit. It is equipped with.
- the plurality of charging electrodes are arranged corresponding to the plurality of nozzles, and charge the ink particles ejected from each of the plurality of nozzles.
- the deflection electrode is a means for deflecting charged ink particles.
- the arrangement direction of the plurality of nozzles is orthogonal to the deflection direction of the charged ink particles.
- the control unit expands the print characters input from the input unit into a dot matrix, assigns each dot data to a plurality of nozzles, ejects ink from the plurality of nozzles, and the value of the charging voltage applied to the plurality of charging electrodes. And the application timing are controlled. With such a configuration, it is possible to print a character string of one stage on a printing object using a plurality of nozzles.
- the deflection electrode is composed of a pair of flat plate electrodes regardless of the number of nozzles and charging electrodes.
- the control unit prints one row of character strings on the printing object by sequentially printing dot rows from a plurality of nozzles.
- the input unit has a printing condition setting unit that can set printing conditions independently for each of the plurality of nozzles.
- the control unit controls the ink ejection operation, the charging voltage value, and the application timing in accordance with the printing conditions set by the printing condition input unit.
- the control unit adjusts the value of the charging voltage applied to the charging electrode corresponding to the nozzle whose print character height should be adjusted. To do.
- the control unit adjusts the application timing of the charging voltage applied to the charging electrode corresponding to the nozzle whose print start timing is to be adjusted.
- the control unit creates ink particles that do not print in the print row interval according to the adjustment value of the print row interval for each nozzle. By applying a charging voltage that is inserted in units of dots to the charging electrode, the print row interval is adjusted.
- the control unit controls the inclination of the dot row generated by each nozzle based on the usage rate. By doing so, a special print pattern is realized.
- the present invention it is possible to improve the printing quality by preventing the character width of the printing result from being widened even when the conveyance speed of the substrate is increased.
- FIG. 1 is a block diagram showing an overall circuit configuration of an ink jet recording apparatus according to an embodiment of the present invention.
- FIG. 2 is a diagram illustrating a schematic configuration of a print head.
- FIG. 9 shows the example of printing (high-speed printing) in the 2 nozzle print head structure of this embodiment, and the example of a charging voltage waveform (1). It is a figure which shows the example of printing (high-speed printing) in the 2 nozzle print head structure of this embodiment, and the example of a charging voltage waveform (2). It is a figure which shows the example of defective printing in the 2 nozzle print head structure of this embodiment, the example of improvement printing (high-speed printing), and the example of a charging voltage waveform. It is a figure which shows the example of application printing (special pattern) which becomes possible when the 2 nozzle print head structure of this embodiment is implemented.
- the upper part of FIG. 9 shows the case where the print start timing is controlled for each nozzle, and the lower part of FIG.
- FIG. 9 shows the case where the particle usage rate is controlled for each nozzle. It is a figure which shows the example of a setting on the setting screen (GUI) by this embodiment. It is a print control example using the setting screen (GUI) by this embodiment, Comprising: It is a figure which shows a print start timing chart. It is a print control example using the setting screen (GUI) by this embodiment, Comprising: It is a figure which shows a print result and the example of a charging voltage. It is a figure which shows the example of distribution control of the printing dot data by this embodiment.
- the character width of the printed result is not increased even when the conveyance speed of the substrate is increased.
- the first problem is that the vertical dot pitch printed from each of the plurality of nozzles is not uniform, that is, the print character height is different due to the difference in the print character height of the ink ejected from each nozzle. It is.
- the print character height is determined by the speed of the ink particles ejected from the nozzle, the amount of charge charged by the charging electrode, the strength of the deflection electric field formed in the deflection electrode, etc. fluctuate. Therefore, for this problem, it is necessary to have a mechanism for adjusting the print character height for each nozzle.
- the means for adjusting the charging voltage value independently for each nozzle is most effective.
- the second problem can be considered that the print quality is deteriorated due to the fact that the horizontal dot pitches printed from a plurality of nozzles are not uniform.
- FIG. 4 is a block diagram showing an overall circuit configuration of the ink jet recording apparatus according to the embodiment of the present invention.
- FIG. 4 shows a circuit configuration of an ink jet recording apparatus having two nozzles, but the number of nozzles may be three or more.
- the ink jet recording apparatus includes an MPU (microprocessing unit) 1 that controls the entire ink jet recording apparatus, a ROM (read only memory) 2 that stores programs and the like, and a temporary storage in the ink jet recording apparatus.
- Random access memory (RAM) 3 for storing data
- an input panel 4 for inputting contents to be printed, which also has a display device, a pump for pressurizing ink, a pressure reducing valve and a solenoid valve for adjusting pressure, etc.
- a circulation control circuit 5 for controlling the circulation system component 6, a deflection D / A converter 20 for digital-analog conversion of data instructed by the MPU 1, an AMP 21 for amplifying a signal after D / A conversion, and a charging system circuit A_51
- the charging system circuit B_52, the print head 47, and the object to be printed (work) 49 are detected.
- a work sensor 48 is provided with a printing object detecting circuit 34 to determine the print start timing based on the detection result of the work sensor 48 is a desired timing, the.
- Each block other than the print head 47 and the work sensor 48 is connected to the MPU 1 via the bus line 7 and controlled by the MPU 1.
- the charging system circuit A_51 includes a print start signal command circuit A_8 that outputs a print start signal in accordance with a command from the MPU 1, a charge voltage generation circuit A_9 that generates a charge voltage in response to the timing of the print start signal, and a digital charge voltage value.
- the charging system circuit B_52 has the same configuration as that of the charging system circuit A_51, the description thereof is omitted.
- the print head 47 has two print head components.
- the print head constituting unit A operates a nozzle A_35 that discharges ink, an electrostrictive element A_36 that operates according to an excitation voltage to atomize ink, a charging electrode A_37 that charges ink particles, and a timing for creating ink particles.
- a phase search sensor A_38 for searching, deflection electrodes 45 and 46 for deflecting ink particles, and a gutter A_39 for collecting ink particles that have not been used for printing are provided.
- the other print head component B has the same configuration as the print head component A.
- the charging signal generation circuit A_9 creates and stores various data such as voltage data and timing data for charging the ink particles based on the printing content data input from the input panel 4, and the printing start signal command circuit A_8.
- the data is transferred to the charging D / A converter A_14 in accordance with the print start timing in accordance with the instruction from.
- the voltage value converted into analog by the charging D / A converter A_14 is amplified by the AMP 15 and applied to the charging electrode A_37 in accordance with the print start timing.
- the operator uses the particle usage rate switch A_10 to set the usage rate of the charged particles used for printing. The higher the usage rate, the higher the printing speed becomes possible, but the printing quality deteriorates due to the influence of printing distortion, and vice versa when the usage rate is low.
- the operator uses the excitation setting switch A_11 to determine the creation cycle of the ink particles ejected from the nozzles.
- the oscillation clock output from the oscillator A_12 is divided by the frequency division counter A_16 based on the information of the particle usage rate switch A10 and the excitation setting switch A11, a timing signal is generated, and the charging signal generation circuit A_9 and the excitation voltage generation are generated. It is input to the circuit A_17.
- the signal output from the excitation voltage generation circuit A_17 is amplified by the AMP 18 and applied to the electrostrictive element A_41.
- the electrostrictive element A_36 converts the electric signal from the AMP 18 into vibration, pressurizes the ink, and ejects ink particles.
- the phase search sensor A_38 searches the creation timing of the ejected ink particles. In order to perform optimal printing, it is necessary to apply a charging voltage in synchronization with the ink particle creation timing. Therefore, the detected timing is fed back to cause a phase shift (the timing of ink particle ejection and charging voltage application timing). Shift) is adjusted. More specifically, the signal detected by the phase search sensor A_38 is amplified by the AMP 19 and digitally converted by the phase detection circuit A_13, and then the ink particle creation timing is determined by the MPU1. Then, the charging timing (phase) information at which the MPU 1 is optimal is output to the charging signal generation circuit A_9.
- Ink particles charged by the charging electrode A_37 are deflected by flying through an electric field formed by applying a DC voltage to the plus deflection electrode 46 and grounding the minus deflection electrode 45, and are used for printing. Jumps over the gutter A44 and is ejected from the print head 47, adheres to the work 49, which is the object to be printed, and is used for printing. At this time, deflection is performed according to the charge amount of the ink particles, the deflection amount of the ink particles having a large charge amount is large, and the deflection amount of the particles having a small charge amount is small.
- the magnitude of the DC voltage applied to the plus deflection electrode 46 is obtained by converting the data instructed from the MPU 1 into digital / analog by the deflection D / A converter 20 according to the character height information set from the input panel 4, and by the AMP 21.
- the configuration is variable depending on the configuration to be amplified.
- Ink that was not used for printing that is, ink particles that were not charged and ink particles that were charged for phase search, are collected from the gutter A44 and supplied again to the nozzle A_35 by the circulation system component 6 such as a pump.
- the printed material 49 is conveyed on the conveyor 50, and is printed in a direction substantially perpendicular to the ink ejection direction and the ink deflection direction (when the print head 47 is inclined (see FIG. 5)). (Only the ink outflow direction is orthogonal to the transport direction).
- the print start timing is controlled by the MPU 1 through the workpiece detection circuit 34 that detects the position of the workpiece by the workpiece sensor 48 and determines whether the print start timing is correct.
- the components in the print head component B including the nozzle B_40 are the same as the components for performing printing with the ink ejected from the nozzle A_35 except for the plus deflection electrode and the minus deflection electrode.
- a control circuit for performing printing with ink ejected from the nozzle A_35 is defined as a charging system circuit A_51
- a control circuit for performing printing with ink ejected from the nozzle B_40 is defined as a charging system circuit B_52.
- the constituent elements of the charging system circuit B_52 are configured by elements and parts equivalent to the charging system circuit A_51.
- a configuration in which a plurality of nozzles are arranged in the print head 47 is employed, but the arrangement direction of the plurality of nozzles is substantially orthogonal to the deflection direction by the deflection electrodes.
- the charged ink particles produced from each nozzle are deflected by a pair of deflection electrodes regardless of the number of nozzles and charging electrode pairs.
- the direction of the electric field at the charging electrode and the direction of the electric field at the deflection electrode are almost orthogonal to each other.
- FIG. 5 is a diagram showing an arrangement relationship between the print head 47 and the work and an arrangement configuration of each component inside the print head 47.
- the print head 47 is preferably disposed obliquely with respect to the conveyance direction of the work (printed object) 49. Thereby, it is possible to prevent the printed characters from being inclined (see, for example, FIG. 2).
- FIGS. 1 to 3 show the operation principle when printing is performed using a known technique for one nozzle. It explains using.
- FIG. 1 is a diagram showing an example of a printing result and a charging voltage waveform when printing is performed when a work is conveyed at a certain speed in one nozzle as described above.
- the upper part of FIG. 1 shows the case where the particle usage rate is 1/2.
- a particle usage rate of 1/2 means that the voltage waveform makes one ink particle to be charged with respect to two ink particles ejected from the nozzle.
- the particle usage rate 1/1 means that all ink particles ejected from the nozzles are to be charged
- the particle usage rate 1/3 means that the 3 ink particles ejected from the nozzles are to be charged. This means that the number of ink particles is one.
- FIG. 1 is a diagram showing an example of a printing result when the charging voltage waveform is changed in the case where the work conveyance speed is the same as that in the upper stage of FIG.
- the middle row in FIG. 1 shows the printing result with a particle usage rate of 1/1.
- the horizontal direction that is, the column spacing in the workpiece conveyance direction is halved and the printing inclination angle is also in the vertical direction in principle.
- the lower part of FIG. 1 shows the printing result when the particle usage rate is 1/1, but uncharged particles that are not charged are inserted between the columns.
- the column spacing can be controlled by changing the number of uncharged particles.
- FIG. 2 is a diagram for explaining the principle in the case of printing an actual print character (here, “A” is taken as an example).
- the upper part of FIG. 2 shows the printing result at the same speed and the same charging voltage waveform as the upper part of FIG.
- the positional relationship between the print head 47 and the work 49 is not twisted.
- the charging voltage waveform and the printing result on the work when the control is performed to print “A” at a particle usage rate of 1/1 are shown in the middle of FIG.
- FIG. 3 is a diagram showing an example of a printing result when the work conveyance speed is increased in the same charging voltage waveform as that in FIG. Although the timing period when the charged ink particles land on the work is the same, the transport speed is increased, so the print interval is increased as shown in the lower part of FIG. Although the quality is deteriorated because it is extended, there is a problem that printing cannot be performed in a narrow work area due to widening of the print character width.
- the means for increasing the particle usage rate is the most effective method for reducing the print character width even when the work conveyance speed is increased.
- the particle usage rate of 1/1 is the maximum printing speed. Therefore, it is necessary to perform one-stage printing using two or more nozzles in order to cope with further increase in the conveyance speed. is there.
- FIG. 6 is a diagram showing an example of a printing result when printing is performed with two nozzles and an example of a waveform of a charging voltage applied to ink particles ejected from the two nozzles.
- Printing is performed so that the printing row of nozzle B is inserted between the printing row intervals of nozzle A (printing from nozzle A and printing from nozzle B are performed alternately).
- it is possible to narrow the interval between the print columns, that is, to narrow the print character width, and it is possible to cope with high-speed printing.
- the printing row interval by printing of the nozzle A and the printing row interval by printing of the nozzle B can be printed at a certain uniform interval on the principle of operation of the ink jet recording apparatus.
- problems such as variations in the structural arrangement of the nozzles A and B, variations in the flying speed of each ink particle, that is, variations in timing from when the charging voltage is applied to the ink landing on the workpiece, the nozzle A Even if the interval between the print row and the print row of the nozzle B is not controlled, uniform row print cannot be realized. Therefore, with regard to this problem, it has a function that can independently adjust the timing of applying the charging voltage applied to the ink particles ejected from each nozzle, so that it is possible to evenly control the print row interval and print quality.
- test printing is performed, and based on the printing result, the operator uses a GUI described later (see the example of the input panel 4 (FIG. 10)) and the charging voltage generation circuit A_9 in FIG.
- the timing of generating the charging voltage by the charging voltage generation circuit B_23 may be adjusted.
- FIG. 7 is a diagram showing an example of the result of printing on the workpiece and the example of charging voltage waveforms of nozzle A and nozzle B when the printing content “A” is actually printed.
- FIG. 7 by rotating the print head, the inclination of characters in the print result on the work is improved, and high-quality printing as shown in FIG. 7 can be performed. It becomes.
- FIG. 8 shows an example of defective printing on a workpiece when the same charging voltage value is applied to each nozzle.
- a charging voltage is applied to the charging electrode to give charges to the ink particles, and the workpiece is deflected in the deflection electrode according to the amount of the charges.
- the principle of forming printed characters by traveling in a direction substantially perpendicular to the particle flight direction and the charged ink particle deflection direction is used.
- the amount of deflection of the charged ink particles varies due to the variation in the charge amount of the charged ink particles of the ink ejected from each nozzle and the ink flight speed.
- the variation is mainly caused by variations in the positional relationship between the flying ink particles and the charging electrode, the ink ejection pressure, the ink viscosity, and the like. That is, even if the repetition accuracy of a single nozzle is good, the variation between the nozzles is large, and even if the same charging voltage waveform is actually applied to the charging electrode A and the charging electrode B, the deflection amount of the charged ink particles is different. Defective printing as shown in the upper part of FIG. 8 may occur.
- the inkjet recording apparatus has a function of independently adjusting the charging voltage value using the input panel 4 (GUI example (see FIG. 10)).
- GUI example the charging voltage value changes when the character height setting value input from the input panel is varied. That is, in the case of the upper part of FIG. 8, since the voltage value applied to the charging electrode B of the nozzle B is too large (the charge amount of the ink particles is too large), the deflection amount of the ink particles from the nozzle B is the nozzle A.
- the amount of deflection of the ink particles is significantly different from the amount of deflection of the ink particles, but the amount of deflection of the ink particles is adjusted by adjusting the voltage value applied to the charging electrode B of the nozzle B to a small value as shown in the lower part of FIG. And is controlled to a good character height.
- the print quality can be improved by making adjustments while comparing with the print result on the actual workpiece.
- FIG. 9 is a diagram illustrating a printing example (special pattern) that can be performed by the printing method according to the present embodiment.
- the upper part of FIG. 9 shows a method for realizing printing of bold characters, and the lower part of FIG. 9 shows a method for realizing printing of characters for special purposes.
- the particle usage rate is changed.
- the usage rate of particles from nozzle A is set to 1/1
- the usage rate of particles from nozzle B is set to 1/2.
- the method can be used for special printing applications such as symbols and logos.
- FIG. 10 shows an example of the setting screen
- FIG. 11 shows a timing chart showing the charging voltage output timing for the ink particles ejected from the nozzle A and the nozzle B from the detection to the work sensor
- FIG. 12 shows the printing result at the time of this setting And an example of a charging voltage waveform.
- the charging voltage output timing applied to each nozzle from the work sensor detection is arbitrarily changed according to each nozzle in accordance with the print start position setting information of each nozzle input by the operator. It has a possible configuration. As shown in FIGS. 4 and 5, the circuit configuration and outline of the appearance of the ink jet recording apparatus are provided with a plurality of nozzles arranged in the traveling direction of the work that is the printing object. In this case, considering the response when the moving speed of the workpiece changes and the speed of the ink particles ejected from each nozzle are not exactly the same speed, fine adjustment of the print row interval of the ink particles ejected from a plurality of nozzles You must be able to do it. Therefore, with respect to this problem, a setting screen 54 is prepared, and the charging voltage output timing is set by allowing specific numerical values to be input for the print start position, the character height, the particle usage rate, and the print row interval adjustment. Each can be fine tuned.
- the print start position will be described. Since the print dot and print row (scan) clocks as fine adjustment units are generated by the frequency dividing counter 16, the charging voltage output timing is delayed based on the timing signal in order to realize fine adjustment. As shown in FIG. 11, the timing for outputting the charging voltage is determined based on the print start position of each nozzle input from the setting screen 54. For example, when the print start positions from the nozzles are slightly shifted and overlapped, bold characters can be printed as described in the upper part of FIG. In the case of normal printing (when printing one stage of character string with two nozzles), the timing is set so that the print row from nozzle B is arranged in the middle between the print rows from nozzle A. (See FIG. 6).
- each nozzle shares a deflection electrode. Can be adjusted.
- each nozzle has a character height setting function, and the setting voltage can be input independently to adjust the charging voltage width.
- the charging voltage width here means the difference between the charging voltage printed at the lowest level and the charging voltage printed at the highest level. The height of the printed character changes according to the charging voltage width.
- the inclination of the print row (dot row) from each nozzle is adjusted by enabling the setting of the particle usage rate to be adjusted for each nozzle. (See the lower part of FIG. 9).
- the print row interval adjustment value as shown in FIG. 12, non-print dots that do not print in the print row interval are inserted for each nozzle in accordance with the print row interval adjustment value for each nozzle.
- FIG. 13 is a diagram for explaining the concept of print dot data control. Specifically, the printing dot control is based on the setting information of the input panel 4 shown in FIG. 4 as hardware components, and the MPU 1 expands the dot data in the RAM 3, and the charging voltage generation circuit A_9 and the charging voltage generation circuit B_23. Is executed by instructing the charging voltage value to be applied and the timing.
- FIG. 13 shows an example of print dot data on the input panel and data assigned to the nozzles A and B with respect to the input print dot data.
- the dot data is printed by the MPU 1 using two nozzles such as the print dot data (b) of the nozzle A and the print dot data (c) of the nozzle B using the temporary storage area of the RAM 3.
- the dot data of the odd-numbered rows are alternately developed for the nozzle A
- the dot data of the even-numbered rows are alternately developed for the nozzle B for each row.
- the odd and even columns may be reversed, but they are alternately developed for each column.
- the first, fourth and seventh rows are developed on nozzle A, the second, fifth and eighth rows on nozzle B, and the third, sixth and ninth rows on nozzle C.
- the control in the present invention can be realized.
- a plurality of nozzles, and charging electrodes and deflection electrodes are arranged corresponding to the plurality of nozzles.
- the arrangement direction of the plurality of nozzles is orthogonal to the deflection direction of the charged ink particles.
- the control unit (MPU) of the ink jet recording apparatus expands the print characters input from the input unit into a dot matrix, assigns each dot data to a plurality of nozzles, performs an ink ejection operation from a plurality of nozzles, a plurality of The value of the charging voltage applied to the charging electrode and the application timing are controlled, and a single character string is printed on the printing object by a plurality of nozzles.
- a single-stage character string is printed on the printing object.
- the deflection electrode is composed of a pair of flat plate electrodes regardless of the number of nozzles and charging electrodes.
- the deflection electrode and the DC voltage for forming the deflection electric field can be implemented in one system, an inexpensive apparatus can be provided. That is, only one power source for applying a voltage to the deflection electrode is required, and the cost of the apparatus can be reduced.
- there are a plurality of pairs of deflecting electrodes there is a possibility that discharge occurs in the slit (gap) between the electrode pairs. According to this embodiment, such a situation can be prevented and ink particles can be deflected stably. Will be able to.
- a printing condition setting unit capable of setting printing conditions independently for each of the plurality of nozzles.
- the control unit controls the ink ejection operation, the charging voltage value, and the application timing in accordance with the printing conditions set by the printing condition input unit. Since printing can be executed while changing the printing conditions in units of nozzles in this way, fine adjustment of the printing operation can be performed in units of nozzles.
- the control unit adjusts the value of the charging voltage applied to the charging electrode corresponding to the nozzle whose print character height should be adjusted. To do.
- the same voltage value is set for each nozzle, even if the printing height varies among nozzles, the height of the one-stage character string realized by a plurality of nozzles is made constant by fine adjustment. Will be able to.
- the control unit adjusts the application timing of the charging voltage applied to the charging electrode corresponding to the nozzle whose print start timing is to be adjusted. In this way, by adjusting the print start timing between the nozzles, it is possible to adjust a subtle print timing shift between the nozzles. Further, if the print start timing is adjusted so that the print dots between the nozzles overlap, it is possible to cope with printing of special characters such as bold characters (printing of decorative characters).
- the control unit creates ink particles that do not print in the print row interval according to the adjustment value of the print row interval for each nozzle.
- the print row interval is adjusted. By doing so, it is possible to realize printing of a one-stage character string with a plurality of nozzles while adjusting the print string interval in accordance with the input character string mark.
- the control unit controls the inclination of the dot row generated by each nozzle based on the usage rate. By doing so, a special print pattern is realized. By doing so, it is possible to cope with printing of a character string having a special shape.
- various one-stage character strings can be printed by adjusting the combination of the character height, the print start timing, the print string interval, and the particle usage rate.
- print start signal command circuit B 23 ... charge voltage generation circuit B, 24 ... particle usage rate switch B , 25 ... Excitation setting switch B, 26 ... Transmitter B, 27 ... Phase detection circuit B, 28 ... Charging D / A converter B, 29 ... AMP, 30 ... Frequency division counter B, 31 ... Excitation voltage generation circuit B, 32 ... AMP, 33 ... AM 34 ... Printed object detection circuit, 35 ... Nozzle A, 36 ... Electrostrictive element A, 37 ... Charging electrode A, 38 ... Phase search sensor A, 39 ... Gutter A, 40 ... Nozzle B, 41 ... Electrostrictive element B 42 ... Charging electrode B, 43 ... Phase search sensor B, 44 ... Gutter B, 45 ...
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Description
図4は、本発明の実施形態によるインクジェット記録装置の全体回路構成を示すブロック図である。図4は2つのノズルを有するインクジェット記録装置の回路構成を示しているが、ノズルの数は3つ以上でも良い。
図5は、印字ヘッド47とワークとの配置関係及び印字ヘッド47内部の各部品の配置構成を示す図である。インクジェット記録装置を用いてワークへ印字する場合、印字ヘッドカバー53を取り付けて使用する。印字ヘッドカバー53を取り外した時の印字ヘッド内部は図5に示す部品で構成される。
(1)次に、本発明における印字動作を具体的に説明するが、理解をより深くするために、まず1ノズルにおける公知技術を使用して印字を行う場合の動作原理について図1乃至3を用いて説明する。
続いて、図10乃至12を用いて、設定画面(入力パネル4)における入力情報から帯電電圧の出力に至る処理について説明する。図10は設定画面例を示し、図11はワークセンサに検出からノズルAおよびノズルBより噴出されるインク粒子に対する帯電電圧出力タイミングを示すタイミングチャートを示し、図12は、本設定時の印字結果と帯電電圧波形例を示している。
図13は、印字ドットデータ制御の概念を説明するための図である。具体的な印字ドット制御は、ハード的な構成要素として図4に示す入力パネル4の設定情報に基づいて、MPU1がRAM3内にドットデータを展開し、帯電電圧発生回路A_9及び帯電電圧発生回路B_23に対して印加する帯電電圧値及びタイミングを指示することによって実行される。
本実施形態のインクジェット記録装置の印字ヘッドでは、複数のノズルと、複数のノズルに対応して帯電電極と、偏向電極が配置されている。ここで、複数のノズルの配列方向は、帯電したインク粒子の偏向方向と直交している。そして、インクジェット記録装置の制御部(MPU)は、入力部より入力された印字文字をドットマトリックス状に展開し、各ドットデータを複数のノズルに割り当て、複数のノズルからのインク噴出動作、複数の帯電電極に印加する帯電電圧の値、及び印加タイミングを制御し、複数のノズルによって1段の文字列を被印字物に印字する。複数のノズルからのドット列の印字を順番に実行する(2ノズルの場合には、交互に印字を実行する)ことにより、1段の文字列を被印字物に印字する。このようにすることにより、被印字物の搬送速度が高速時にも印字結果の文字幅を広がらない良好な印字品質の印字を行うことが可能となる。
Claims (11)
- 搬送される被印字物に対して印字するインクジェット記録装置であって、
複数のノズルと、
前記複数のノズルに対応して配置され、前記複数のノズルのそれぞれから噴出されたインク粒子を帯電させるための複数の帯電電極と、
前記帯電したインク粒子を偏向する偏向電極と、
印字文字を入力するための入力部と、
前記入力部より入力された印字文字をドットマトリックス状に展開し、各ドットデータを前記複数のノズルに割り当て、前記複数のノズルからのインク噴出動作、前記複数の帯電電極に印加する前記帯電電圧の値、及び印加タイミングを制御する制御部と、を備え、
前記複数のノズルの配列方向は、前記帯電したインク粒子の偏向方向と直交しており、前記複数のノズルによって1段の文字列を前記被印字物に印字することを特徴とするインクジェット記録装置。 - 請求項1において、
前記偏向電極は、前記ノズル及び前記帯電電極の設置個数に関係なく、1対の平板電極で構成されていることを特徴とするインクジェット記録装置。 - 請求項1において、
前記入力部は、前記複数のノズルのそれぞれについて独立に印字条件の設定可能な印字条件設定部を有し、
前記制御部が、前記印字条件入力部によって設定された前記印字条件に従って、前記インク噴出動作、前記帯電電圧の値、及び前記印加タイミングを制御することを特徴とするインクジェット記録装置。 - 請求項3において、
前記印字条件設定部で印字文字高さの調整が指示された場合、前記制御部は、前記印字文字高さを調整すべきノズルに対応する前記帯電電極に印加する帯電電圧の値を調整することを特徴とするインクジェット記録装置。 - 請求項3において、
前記印字条件設定部で印字開始タイミングの調整が指示された場合、前記制御部は、前記印字開始タイミングを調整すべきノズルに対応する前記帯電電極に印加する帯電電圧の印加タイミングを調整することを特徴とするインクジェット記録装置。 - 請求項3において、
前記印字条件設定部で印字列間隔の調整が指示された場合、前記制御部は、ノズル毎の前記印字列間隔の調整値に応じて、印字列間隔に印字を行わない無印字ドットをインク粒子作成ドット単位で挿入するような帯電電圧を前記帯電電極に印加することにより、前記印字列間隔を調整することを特徴とするインクジェット記録装置。 - 請求項3において、
前記印字条件設定部で各ノズルから噴出されるインク粒子の粒子使用率が異なるように設定された場合、前記制御部は、前記使用率に基づいて、各ノズルによって生成されるドット列の傾きを制御することにより、特殊印字パターンを実現することを特徴とするインクジェット記録装置。 - 請求項3において、
前記制御部は、前記複数のノズルからのドット列の印字を順番に実行することにより、前記1段の文字列を前記被印字物に印字することを特徴とするインクジェット記録装置。 - インクジェット記録装置で用いられる印字ヘッドであって、
複数のノズルと、
前記複数のノズルに対応して配置され、前記複数のノズルのそれぞれから噴出されたインク粒子を帯電させるための複数の帯電電極と、
前記帯電したインク粒子を偏向する偏向電極と、
前記複数のノズルの配列方向が、前記帯電したインク粒子の偏向方向と直交することを特徴とする印字ヘッド。 - 請求項9において、
前記帯電電極における電界の方向が、前記偏向電極における電界の方向と直交することを特徴とする印字ヘッド。 - 請求項9において、
前記偏向電極は、前記ノズル及び前記帯電電極の設置個数に関係なく、1対の平板電極で構成されていることを特徴とする印字ヘッド。
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US13/389,609 US8764169B2 (en) | 2009-08-11 | 2009-08-11 | Inkjet recording device and printing head |
IN864DEN2012 IN2012DN00864A (ja) | 2009-08-11 | 2009-08-11 | |
PCT/JP2009/064170 WO2011018841A1 (ja) | 2009-08-11 | 2009-08-11 | インクジェット記録装置、及び印字ヘッド |
CN200980160867.0A CN102470669B (zh) | 2009-08-11 | 2009-08-11 | 喷墨记录装置和打印头 |
EP09848260.7A EP2465681B1 (en) | 2009-08-11 | 2009-08-11 | Inkjet recording device and printing head |
JP2011526657A JP5190146B2 (ja) | 2009-08-11 | 2009-08-11 | インクジェット記録装置、及び印字ヘッド |
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JP2014073644A (ja) * | 2012-10-05 | 2014-04-24 | Hitachi Industrial Equipment Systems Co Ltd | インクジェット記録装置 |
JP2020518490A (ja) * | 2017-05-03 | 2020-06-25 | ドミノ・ユーケイ・リミテッドDomino UK Limited | プリンタにおける改善またはプリンタに関する改善 |
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JP6058938B2 (ja) * | 2012-07-30 | 2017-01-11 | 株式会社日立産機システム | インクジェット記録装置及び印字制御方法 |
JP2016083805A (ja) * | 2014-10-24 | 2016-05-19 | セイコーエプソン株式会社 | 画像形成装置、及び画像形成方法 |
CN104924761B (zh) * | 2015-06-09 | 2016-06-29 | 厦门英杰华机电科技有限公司 | Cij喷码机打印速度控制方法 |
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EP3501831B1 (en) * | 2016-08-22 | 2022-08-17 | Hitachi Industrial Equipment Systems Co., Ltd. | Inkjet recording device and inkjet recording device control method |
JP6626801B2 (ja) * | 2016-08-22 | 2019-12-25 | 株式会社日立産機システム | インクジェット記録装置 |
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JP7223780B2 (ja) * | 2019-01-29 | 2023-02-16 | 株式会社日立産機システム | インクジェット記録装置およびインクジェット記録装置の制御方法 |
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JP5190146B2 (ja) | 2013-04-24 |
CN102470669A (zh) | 2012-05-23 |
CN102470669B (zh) | 2015-02-18 |
US8764169B2 (en) | 2014-07-01 |
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EP2465681A1 (en) | 2012-06-20 |
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