JPS58212964A - Deflection control type ink jet recorder - Google Patents

Abstract

PURPOSE:To set up the breaking position of ink particles within a proper value region as well as prevent charge on satellite by a method in which plural charge electrodes are arranged in the flying direction of ink between the nozzle of an ink jet head and a deflection electrode, and voltage is selectively applied to these charge electrodes. CONSTITUTION:Plural charge electrodes 15a1-15a5 are set along the flying direction of ink between an ink jet nozzle 9 and a deflection electrode, and voltage is applied selectively to any of the electrodes. In case where satellite particles are generated, since the breaking points of ink column become plural, charge voltage is orderly applied to all of the charge electrodes 15a1-15a5, and it is checked whether or not the electrodes are plural enough to charge electrically. For example, when voltage is applied to charge electrodes 15a2 and 15a4 and what is charged is detected, one of these is due to the charge on the satellite particles. Thus, to avoid the formation of satellite particles, the amplitude of voltage to be applied to electrostrictive oscillator is varied, for example.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention jets vibrated ink from a nozzle, selectively charges the jetted ink at a position where it separates into ink particles with a charging electrode, and deflects the charged ink particles with a deflection electrode. The present invention relates to an inkjet recording apparatus that deflects the ink to collide with a predetermined position on a recording paper, and particularly relates to atomization control that separates ink ejected from a nozzle into particles.

In this type of inkjet printer, ink that is continuously ejected from a jet is separated into ink particles of a predetermined size while in flight, which is called atomization. This particle formation is carried out by applying a constant periodic high frequency vibration I to the pressurized ink within the ink ejecting head. The principle of charging in inkjet recording is based on the fact that the ink is broken with a charge generated at the tip of the ink due to electrostatic induction in an electric field generated by a charging electrode, and a charge remains in the separated ink. Therefore, if the break point of the ink and the position of the charging electrode or the timing of charging do not match,
Separated ink particles are not charged in a predetermined manner. If the amount of charge on the In multi-particles differs from the predetermined amount, the deflection range changes, making it impossible to record at a predetermined position. Therefore, in inkjet recording, it has been conventionally difficult to deal with ink pressure vibrations.

The charge on the ink droplets is detected by sequentially shifting the phase of the charge voltage pulse (phase search charge pulse) applied to the charge electrode, and the charge during printing and recording is determined based on the phase when the ink droplets become charged. Set the voltage.

However, the breaking point of the ink column, that is, the position where particle formation occurs, changes when the viscosity of the ink changes due to changes in the ink temperature, moisture content due to evaporation, etc., and it is also controlled by controlling the ink pressure, the magnitude of the applied vibration, etc. It also changes depending on the amount, and there are cases where the amount of charge on an ink droplet deviates from an appropriate value, or where satellite ink particles are generated and the charge phase of the satellite ink particles is detected by phase search.

The first object of the present invention is to detect the breakage position of ink particles from the ink and set this to an appropriate value range, and the second object is to detect the generation of satellite particles and prevent them from occurring. or at least prevent satellite charging.

In order to achieve the object 1, in the present invention, a plurality of charging electrodes are arranged in the ink flight direction between the nozzle of the ink jet head and the deflection electrode, and a voltage is selectively applied to the charging electrodes. An electric current is applied to charge the ink particles.

In one aspect of the present invention, since an electric field for charging can be created at any position, the electrode to which voltage is applied is switched to detect where the break point is, and then the break point is located at the appropriate position. Perform feedback control so that According to this, by increasing the number of charging electrodes and shortening the interval between the charging electrodes, it is possible to dramatically improve the accuracy of detecting the position of the ink breakage point.

The charge on the ink particles can be detected by applying the flying ink particles to an electrode and detecting the discharge current, or by using an electrostatic M conductive electrode, or by detecting the electric charge of the ink on the ink jetting navel F side. The current during particle separation and charging may be detected. Further, the feed balance control may be performed by controlling the amplitude of a signal that drives a vibrator that vibrates the ink in the ink jet head, or may be performed by controlling the ink pressure, ink temperature, etc.

However, in view of response speed, ease of control, etc., it is most preferable to control the amplitude of the vibration applied to the ink.

In another preferred embodiment of the present invention, when the charge of an ink particle is detected and there are two or more electrodes sandwiching other electrodes, it is determined that a satellite is generated, and one or a plurality of consecutive electrodes are detected. At least one of pressure amplitude, ink pressure, and ink temperature is controlled until only the electrodes detect a charge (no satellite charges). Also, 1 of the present invention
In one preferred embodiment, the plurality of electrodes are constructed by stacking conductor plates with insulators sandwiched between them. According to this, by reducing the thickness of the insulator, the distance between each charging electrode can be shortened, and manufacturing can be facilitated. 1, the present invention will be described in detail below with reference to the drawings. FIG. 1 shows the structure of the carriage portion σ) according to an embodiment of the present invention, and FIG. 2 shows an exploded view of the head assembly with the carriage. Explaining with reference to these drawings, a first adjustment table 5 is rotatably attached to the head base 1 by a shaft pin 4, and a straight line connecting the second adjustment table 5 and the pin 4 is attached to the head base 1. A long elongated hole 5a is formed along the elongated hole 5a, and an eccentric bottle 6 having a straight head slightly shorter than the short axis of the elongated hole 5a is inserted into the elongated hole 5a.
The eccentric leg of is pivotally connected to the helad base l. By rotating the eccentric pin 6, the first adjustment table 5 is rotated clockwise or counterclockwise about the shaft pin 4.

The first adjustment table 5 has a dogleg-shaped shape, and a second adjustment table 8 is pivotally attached to its vertical wall with a shaft pin 7.
An ink ejecting head 9 is fixed to an adjustment table 8. A leaf spring 10 is inserted between the first adjustment table 5 and the second adjustment table 8, and this leaf spring 10 applies a clockwise rotational force to the second adjustment table 8. The tip of the adjustment screw 11 screwed into the second adjustment table 8 hits the top surface of the first adjustment table 5, thereby preventing the second adjustment table 8 from rotating clockwise. By tightening the adjustment screw 11, the second adjustment table 8 is rotated counterclockwise, and by loosening the screw 11, the adjustment table 8 is rotated clockwise.

A first deflection electrode 13a is fixed to the head base 1 via an electrode stand 12a, and a gutter 21 is directly fixed to the head base 1.

A second deflection electrode 13b is fixed to the head cover 2 at a position opposite to the first deflection electrode 13a via an electrode stand +2b, and the tip of the ink jet head 9 and the deflection electrode 13a are fixed to each other via an electrode stand +2b.
An electrode stand I4 is fixed at an upper position between the electrode stand 1
A charging electrode 15 formed by laminating a conductive plate and an insulating plate in a cylindrical shape is attached to the cylindrical electrode 4 . In this embodiment, as shown in FIGS. 3a and 3b, the charging electrode 15 includes five electrodes 15al-15a5 and four insulating plates 15bl-1.
It is composed of 5b4. 17a and 17b are spacers for positioning charging electrodes, and 18 is a limit I for opening/closing the power supply.
Switches, 19a and 19b are windshields that also serve as shield plates,
24 is a shield plate that also serves as a charge detection electrode.

With the above configuration, when the head cover 2 is pivoted to the base 1 using the shaft e3 and the cover 2 is closed as shown in FIG. The deflection electrode 13b is parallel to the deflection electrode 13a, and the charging electrode 15 and the charge detection electrode 16 are positioned to surround the ink flow 20 laterally with the ink flow 20 at the center. The head base 1 is fixed to a carriage 22, and the carriage 22 is guided by kite bars 22a and 22b so as to be able to reciprocate in a direction perpendicular to the plane of the paper (Fig. 1), and is guided by a drive system (not shown) perpendicular to the plane of the paper. is scan-driven in the direction of

FIG. 3a shows the configuration of the ink supply system and charge recording system. In a second embodiment, the microprocessor MPLJ,R
OM, RAM, input/output port I10° clock pulse oscillator, outer 4 = J counter, A/D.

The printing control unit 35 starts ink jetting through an interface including necessary components such as a D/Δ converter.

Performs stop +l, ink pressure setting, ink particle formation control two-phase search, deflection setting, and recording control.

A changeover switch (relay) Swr is connected to the shield plate 24, and one changeover contact is connected to ground.
A charge detection circuit 27 is connected to the other switching contact. The printing control unit instructs the unit 35 to prepare for recording with the carriage at the home position. When the unit 35 is instructed to prepare for recording, it first drives the pump 38, then energizes the solenoid of the electromagnetic valve 40 to open it and sets a timer. is detected, and if it is not a predetermined pressure, the energization level of the pump 38 is changed to bring the ink pressure to the set pressure. When the ink pressure reaches the set pressure, turn SWL once.
1! With the #127 side closed, perform ink particle position calibration 1 phase search and deflection setting, and when these are completed, connect s w t and t ground to notify the printing control unit that it is ready, and the printer control unit When a recording command arrives, recording control is performed.

The configuration of the charging voltage switching circuit 50 is shown in FIG. 311.

The output of the charging voltage switching circuit gso includes voltages of each of the charging electrodes 15, II, I, 5a1. 15a2. I5a:3
．． I 5a4 and 15a5 are connected. The charging voltage switching circuit 50 includes a PNI transistor and N1)N+
- Consists of five switching circuits made up of transistors, a decoder DEO, etc. A changeover switch SWO is connected to one end of these PNP transistors.
A predetermined voltage vh and the output voltage of the charging voltage generation circuit 29 are applied to the other end of the switch SWO.

The connection of the switch SWO can be changed by a signal from the printing control unit 35. Therefore, the charging voltage from the charging voltage generating circuit 29 selected by the switch SWO or the predetermined voltage vh is selected by the transistor according to the switching signal from the printing control unit 35, and
al, 15a2. ]5a3. I 5a4.
l 5a5.

In this embodiment, the switch SWO is normally connected to the 29 side, and is switched to the vh side when adjusting the ink droplet formation position.

FIG. 3c shows the configuration of the excitation voltage generator 30.

D/A converter I) A printing control unit 3
A binary signal of a predetermined number of bits for setting an excitation voltage is applied from 5 to 5, and the output voltage of the DAC generated in response to the signal is amplified by an amplifier including an arithmetic amplifier OP and a transistor Q1. The energizing pulse from frequency divider 31 is applied to transistor Q2 via inverter INV. While the energizing pulse is at a high level, Q2 is turned off, so a predetermined voltage appears at the emitter of Ql, but when the energizing pulse is at a low level, Q2 is turned on and the Hass potential of Ql becomes Ov, so the output is The potential at the end becomes oV. In other words,
At the output terminal (emitter of Ql), D is applied at the period of the energizing pulse.
A signal with the same amplitude as the output potential of the /A converter is generated.

Therefore, if the voltage setting signal input to the D/A converter is changed, the amplitude of the voltage applied to the electrostrictive vibrator of the ink jet head changes accordingly.

The configuration of the charging voltage detection circuit 27 is shown in FIG.

Between the core wire of the shielded wire 25 that connects the charge detection electrode 24 and the charge detector @27 and the ground, there is a voltage converting wire having a resistance Rc = 100Ω which is smaller than the insulation between the electrode 24 and the ground. A resistor R is connected. A charge detection circuit 27 is connected to the core wire of the shield wire 14 .

The second circuit 27 is a merchant impedance field effect transistor FET, an operational amplifier OPI, and a bypass filter HPF.

It consists of a smoothing integral circuit fillGR and a comparator COM.

Upon receiving the recording preparation command, the printing control unit 35 turns on the SW.
L is closed to the circuit 27 side to start outputting the clock pulse CKI to the frequency divider 3I and the phase setting port M32. The frequency divider 31 divides the frequency of the clock pulse (1 into 1/8) and applies it to the excitation voltage generator 3o. A voltage is generated and the pressurized ink in the head 9 is regularly separated into ink particles at a rate of one ink particle per eight periods of CKI.

FIG. 5 shows the configuration buttons of the phase setting circuit 32. A clock pulse CKI is applied to the counter CO1 of the phase setting port a32. The counter COI is an octal counter that outputs a count code of 0 after counting up to 8.
While CKI is arriving, 0, 1 . N, 3...
8. The counting operation continues as O, l, 2.... The output code of counter COI is applied to decoder DEI. Therefore, the decoder DE+ is
Each time a clock pulse cK1 arrives, the output of high level rlJ is transferred sequentially at output terminals 0 to 7. As a result, each of the output terminals 0 to 7 of the decoder DEI outputs a phase search pulse whose phase is shifted from each other by the cycle of CKI by 1 l, and whose pulse width is 1/8 of the ink droplet generation cycle T2, or T1. Output. These eight sets of phase search pulses are connected to the AND gate A of the first group, respectively.
It is applied to each of 0 to 8 of GI, and the output of each OR gate of OR gate group OG1 is applied to each of 0 to 8 of AND gate AG2 of the second group.

As will be described later, during phase search, all the ant gates AG2 of the second group are turned off (gates closed), and the AND gates 0 to 1 of the ant gates 1-AGI of the first group are turned off (gates closed).
7 is selectively turned on (gate 1, open), a specific phase search pulse P p (output O of the decoder DEI
7) is connected to the frequency divider FD via the output OR gate ORI.
I and ant gates ΔNl and AN2, and is applied to the charging voltage generation circuit 3f through the OR gate OR2. Which AND gate AGI of the first group is turned on is determined by the output of the decoder DE2. The count code of the counter CO2 is given to the decoder DE2, and the printing control unit 35 controls clearing and counting up of the counter CO2.

In the phase search, the unit 35 first uses the search signal P
Set d to "0" and clear the counter CO2. As a result, the output terminal O of the decoder DE2 becomes a high level "l",
The first group AGI's Antogame 1 and 0 are turned on,
ORGOO 1 - Output terminal 0 of decoder DIΣl from OR1
A phase search pulse is output.

Since the search signal Pd is "0", the ant gate AN2 is off (gate open), and the output of the frequency divider FDl from which ORI outputs 24 phase search pulses is r.
The AND gate AN outputs 24 phase search pulses at lJ, and while the next 24 phase search pulses are output from ORI, the output of the frequency divider FD'l is "0" and the AND gate AN outputs 24 phase search pulses. l blocks the phase search pulse. This results in
During 24T, the pulse at output terminal 0 of decoder DE-1 is output to OR gate ORI, AND gate ANI and OR gate O.
It is applied to the charging voltage generation circuit 29 through R2, and the next two
It is cut off for 4T, and the phase search pulse is turned on and off every 48T period.

Note that in the charging voltage generation circuit 29, since the standard charging voltage is set, the charging voltage synchronized with the phase search pulse Pp is applied to the charging electrode 15 via the charging voltage switching circuit #50.
is applied to a predetermined electrode.

When the ink particles are properly charged with this charging voltage, a potential oscillation with a period of 48T occurs at the charge detection port N27, the integration circuit charges up, and after a predetermined time (]0rrtsec), the output Pok of the comparator COM becomes ", 0". When there is no charge, there is no potential oscillation, so Pok is
1" remains. After clearing the counter CO2, the printing control unit i.35 checks the output Pok of the circuit 27 after romscC, and if it is not "0" representing charging, it gives one pulse to the counter CO2. This time, the output terminal of the decoder DE2 becomes "1", O of the first group of Antogame 1-AGI is turned off, ■ is turned on, and the second set of phase search pulses (output pulse of output terminal 1 of DEI) is turned off. It is applied to AND gate AN1 and frequency divider FDI through OR gate ORI. In other words, it is assumed that the search pulse pp is delayed by Tl from the previously output one. Similarly, when the output Pok of the charge detection circuit 27 reaches Pok=rOJ indicating "charge", the printing control unit 35 does not apply a pulse to the counter C02, that is, assumes that the optimum charge phase has been determined, This time, the ON command signal "1" is given to all AND gates O to 7 of the second group of ant gates AG2. As a result, if the count value of the counter CO2 is 3, the output terminal 2 of the decoder DE2 is rlJ, and the first group AG
Ant gate 2 of I and AND gate 2 of second group AG2 are both turned on, and the third
A set of phase search pulses is output, and two outputs of the OR gate G1, that is, a second set and a fourth set of phase search pulses are applied to the OR gate OR1 from the AND gate 2 of AC3. In other words, when the third set of phase search pulses is determined, the applied charge pulse is a pulse obtained by subtracting (logical ORing) the phase search pulses of the second and fourth sets on both sides of the third set, i.e. , a pulse centered on the search setting pulse and having a pulse width three times the pulse width is outputted from the ORI as a printing charge pulse. The reason for narrowing the pulse width of the phase search pulse and widening the pulse width of the imprinting charge pulse as shown in 2 is to accurately detect the charge phase by phase search and to ensure the imprinting of the charge. .

FIG. 6 shows the configuration of the charging voltage generating circuit 29. In this embodiment, the charged voltage generating circuit 29 sets the deflection adjustment signal 1') (Hc to "l", sets the image signal to rlJ, and turns on (gate open) the anti-game 1-A N4 when searching for position +11. ,
Turn off AN3 (gate open) and use Antogame 1・ΔN4
AND GROUP ANG ON AND GROUP ANG THROUGH OR3
5cc to G=highest charge code, 1)/A converter D
Apply the Qcc" lowest gain code to A2, apply the standard charge voltage signal of the search pulse pp width to the operational amplifier OP2 from the A converter DAI, and check the conduction of the transistor board at the output of the D/A converter DA2. The gain of the amplifier OP2 is set to the standard value with the ratio as the standard value.

When searching for a phase, l】p has 24 consecutive periods with the same period, the next 24T period is interrupted, and the next 24T period is 11 times again.
Ant game with a pulse pattern of 24 consecutive p's.
Since it joins 1-A N 4, circuit 2 is added at the second turn.
9 applies a standard charging voltage pulse to the hair charging electrode 15. After the phase search is completed, the search signal Pd to the phase setting circuit 32 is set to "1", so the circuit 32 continuously prints a charge pulse Cp with a period T and a pulse width three times that of Pp. Output. When adjusting the deflection amount (r"d='l"), the knitting direction adjustment signal rage to the charging voltage generation circuit 29 is set to "0", and AN3 is set to the AND gate AN/1-4-':/. When OFF, AN3 is turned off for 24T at the output of the frequency divider FD2, and 24 application charge pulses Cp are continuously applied to the AND gate group ANG through the OR gate OR3, the next 24T (24 pulses) is cut off to form a normal pattern similar to the pulse pattern of the phase search pulse Pp. In this deflection amount adjustment setting, 5cc = the charge voltage code of the highest step of recording charge, and the gain code Gcc applied to the D'/A converter DA2 is changed to change the conductivity of the transistor Tr to change the gain of the operational amplifier OP2. The charging voltage can be changed by changing the .

FIG. 7 shows an outline of the control operation of the printing control unit 35. Among the second controls, phase search is as described above. Chapter 8a
The details of the ink atomization position adjustment control are shown in the figure.
The figure shows details of the deflection amount adjustment control.

Particulate position adjustment control will be explained with reference to FIG. 3b and FIG. 8a. Because it measures the electrification of flying ink particles,
First, switch SWL to the 27 side and charge electrode 15.
Switch SWO is set to v so that the voltage applied to
Switch to h side. Next, in order to select the charging electrode 15a1 located at the end, "0" is output to the decoder DEO. This causes the output terminal 0 of the DEO to go to a high level l-(,
The other output terminals 1.2.3 and 4 become low level L, transistors Qa and Qf are turned on, and voltage vh is applied to charging electrode 15al. When the ink column breaks at the position of the electrode where the charging voltage was applied in step 72, a negative charge is generated at the tip of the ink column due to electrostatic induction, as shown in Fig. 3b (in Fig. 3b, voltage 4 is applied to 15a3). Since ink particles are generated in the state in which they are generated, the ink particles receive a predetermined negative charge of 4 iF. In this case, when the ink droplet hits the shield plate 24, the charge on the ink droplet is detected by the charge detection circuit IllI27. After applying a voltage to the charged electrode at a predetermined position, it takes a certain amount of time for the ink particles that have passed through that position to reach the shield electrode 24, so wait until that time has elapsed before starting the charge detection circuit. Read the output of MII27.

If no charge is detected here, the decoder [)
The data manually input to the EO is updated, the charging electrode to which the voltage is applied is changed, and the electric field is shifted by one position in the ink flying direction. In other words, if the charged electrode 15a1 was selected before, now input "1" to the decoder DEO to set the output terminal 1 to a high level H, turn on the transistors Qb and Qg, and apply the voltage to the [15a2]. Apply V h. Also,
Even if a charge is detected, if the charge is not an appropriate amount, it is assumed that the ink breakage position and the selected electrode position do not exactly match, and the data set in the decoder DEO is updated again. When the charge amount reaches the appropriate amount, it is determined from the data set in the decoder DEO whether the charging electrode selected at that time is at the position of the charging electrode during normal printing. If the position is not appropriate, determine whether the length from the ink jet nozzle to the selected charging electrode position is longer or shorter than a predetermined value.
The amplitude of the vibration applied to the pressurized ink is increased so that the rupture position approaches the nozzle, and when the vibration is short, the amplitude of the vibration is decreased so that the rupture position moves away from the nozzle. That is, by changing the data set in the D/A converter DAC of the excitation heavy pressure generator 30, the voltage applied to the electrostrictive vibrator is changed. After changing the amplitude of the vibration applied to the ink, the charge of the ink hitting the shield electrode 24 is detected again, and the above process is repeated until both the amount of charge and the position of the selected charging electrode are appropriate. After the second process is completed, the phase search described above is performed. In the particulate position control of this embodiment, the electrode +5al closest to the nozzle is selected first, and then the electrode 15a5 further away is selected.
Although the electrode to which voltage is applied to the side is shifted, conversely, the electrode 15a5 may be selected first.

Deflection violet adjustment based on the charging voltage generation amount 129 will be explained with reference to FIG. 8b. Note that in the configuration of the charging voltage generation circuit 29, when the value indicated by the gain code Gcc is large, the conductivity of the transistor Tr is high, and when the value indicated by the gain code GCC is small, the opposite is true.

The printing control unit 35 finishes the above-mentioned phase search.
Then, the control signal DGc to the charging voltage generation circuit 29 is set to a low level rOJ, which instructs the deflection adjustment.

As a result, in the circuit 35, the ant gate AN4 is closed (gate off) and AN3 is opened (gate on).
The AND gate AN3 outputs 24 impression charge pulses Cp to the OR gate OR3 for 24T, and becomes low level "0" for the next 24T. A pulse Cp is generated with a Cp distribution pattern of 48T per period. and gate group ANC
conducts in the second cp distribution pattern and applies charging voltage code Scc to D/A converter DA+. unit 3
Subsequently, 5cc=applied charge maximum level code (charge voltage code for deflecting ink droplets to the maximum deflection position in printing) is set in the output port to the AND gate group ANG. Furthermore, GCC, - the lowest gain code (lowest value of the adjustment range) is sent to the D/A converter, D
Output to A2]. Then unit 1-
35 sets a timer with a 10m5ec time limit and waits for it to time out. With the above settings, 24 consecutive ink particles are charged, and the next 24 consecutive ink particles are uncharged. The charge pattern has one period of 48T.

Printing control unit L 354t l When the Ornsec timer times out, the output P of the charge detection circuit 27
Refer to ok and increase the output gain code by one unit if it is a low level "0" (ink droplet replicated to electrode 24). Then, in the same way, set the 10m5ec timer to 7 and wait for ]00m5e to elapse.

When the time is over again, the output Po of the charge detection circuit 27
If Pok=rOJ with reference to k, the output gain code is increased by about ti-IQL. The same applies below.

In this way, by increasing the gain code Gcctl unit by unit, the conductivity of the transistor TI becomes lower one by one, and the flying trajectory of the charged ink particles moves little by little, until they finally come off the edge of the electrode 24. When it comes off, Pok becomes rlJ, so control unit 3
5 stops the gain shift at that point. After carrying out step 2, the charged ink particles with the maximum deflection are set on a predetermined trajectory.
, r- is closed to the ground side, the image signal is set to "0", and D
Output and set a ready signal to the printer control unit as Gc-“1”.

Thereafter, printing is performed by reciprocating the carriage 22 while changing Scc in synchronization with the ink droplet generation synchronization pulse Ps.

In the above embodiment, the case where the generation of satellite particles is not taken into consideration has been explained. However, if satellite particles are generated, there will be multiple breaking points of the ink column, so in that case, for example, the charged electrode 15al, 1
5a2. l 5a3. l 5a4 and 15a
It is sufficient to sequentially apply a charging voltage to all of the electrodes 5 to check whether there are a plurality of electrodes that can be charged. That is, for example, if it is detected that the charged electrodes 15a2 and 15a4 are charged when a voltage is applied to them, one of them is due to the charge of the satellite particle, so it is assumed that the satellite particle is generated. For example, the amplitude of the voltage applied to the electrostrictive vibrator is changed so that satellite particles are not generated. However, if the number of charged electrodes is very large and the distance between each charged electrode is short, charging will occur at multiple electrodes even if no satellite particles are generated. Satellite generation is determined only when charging occurs at the electrodes at both ends of the molecule.

As described above, according to the present invention, it is possible to accurately adjust the breaking point of the ink column to a predetermined position to perform preferable inkjet recording.

[Brief explanation of drawings]

FIG. 1 is a side view showing the main parts of the mechanism of an embodiment of the present invention, FIG. 2 is an exploded perspective view of the carriage shown in FIG. 1, and FIG.
The figure is a block diagram showing the configuration of the ink supply system and charging control system of the above embodiment, Figure 3b is a block diagram showing the charging electrode and charging voltage switching circuit, and Figure 3c is the excitation voltage generator 30.
4 is a circuit diagram showing the configuration of the charge detection circuit 27, FIG. 5 is a circuit diagram showing the configuration of the phase setting circuit 32, and FIG. 6 is a circuit diagram showing the configuration of the base voltage generation circuit 29. 7 is a flowchart showing an outline of the control operation of the printing control unit 35, and FIGS. 8a and 8b are flowcharts showing details of the atomization position adjustment control operation and the deflection adjustment control operation, respectively. It is. l: Helad base 2: Helad cover 3: Axis pin 4: Bin 5: Adjustment stand 5a: Elongated hole 6: Eccentric bottle 7: Shaft bin 8: Adjustment stand 9: Ink jet head 10: Leaf spring ll: Adjustment screw 12a, 12b: Electrode stand 13a, 13b: Deflection electrode 14: Electrode stand 15: Charge electrode 15al, 15a2.15a3.15a4. +5a
5: Charged electrode +5bl, 15b2.15b3.15
b4: Insulator 17a, 17b Varnish spacer 18:
Limit 1~Switch 19a, ]Ob: Shield plate
21 Nigator 21a: Collision plate 22: Carriage 2
4: Shield plate (charged detection electrode) SWL, SWO: Changeover switch

Claims (5)

[Claims] (1) Pressurized ink is supplied to the ink ejection head, and in the ink ejection head, the pressurized ink is subjected to regular vibrations and ejected from the nozzle of the head, and at the point when the ink ejected from the nozzle separates into particles, the charged electrode In a deflection control inkjet recording device that applies a charging voltage to charge ink particles and deflects the charged ink particles with a deflection electric field; A plurality of charging electrodes arranged in the direction; A charging detection electrode arranged at a predetermined position to detect the charging state of the ink; A charging voltage applying means for applying a charging voltage to each of the plurality of charging electrodes at different timing; and a charging voltage applying means. the magnitude of the drop applied to the pressurized ink according to the signal detected by the charge detection electrode.
A deflection control inkjet recording device comprising: control means for changing at least one of ink pressure and ink temperature. (2) The deflection control inkjet recording apparatus according to claim (1), wherein the plurality of charging electrodes have a structure in which conductor plates are laminated with an insulator sandwiched therebetween. (3) The charging voltage applying means applies voltage only to one charging electrode during one ink droplet formation period;
Deflection control inkjet recording device. (4) The charge detection electrode is arranged at a position outside the recording range in the ink flying direction.
) Recording device. (5) The deflection control ink jet recording device according to claim (1), wherein the charge detection electrode is a conductor that is always electrically connected to the ink in the ink jet head.