JP4066133B2 - Inkjet recording device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an ink jet recording apparatus, and more particularly to a high speed ink jet printer capable of recording a high-quality image with high reliability.
[0002]
[Prior art]
A line scanning ink jet printer has been proposed as a high speed ink jet printer that performs high speed printing on continuous recording paper. In this apparatus, a long page width line type recording head in which nozzle holes for ejecting ink particles are arranged in a row is arranged in the width direction of the continuous recording paper, facing the recording paper surface to the full width, The ink particles ejected from the nozzle holes are selectively controlled on the recording paper surface according to the recording signal. At the same time, the recording paper is moved in the longitudinal direction of the continuous recording paper at high speed to perform main scanning. With this main scanning and landing control of ink particles on the recording paper, control of recording dot formation on the scanning line is performed to obtain a recorded image on the recording paper.
[0003]
As this line scanning type ink jet printer, many devices that use a continuous ink jet type recording head as a recording head and devices that use an on-demand ink jet type recording head have been proposed. Among these, the on-demand ink jet line scanning ink jet printer does not reach the recording speed as compared with the continuous ink jet type apparatus, but the ink system is very simple. Suitable for
[0004]
This recording head for on-demand ink jet line scanning ink jet printers ejects ink particles by applying pressure to the ink in the ink chamber with the nozzle hole as an opening by applying a driving voltage to the piezoelectric element and heating element. This is a line type recording head in which a large number of nozzles are arranged in a line.
[0005]
A plurality of inks are ejected from adjacent nozzles at each pixel position on the recording paper, along with the nozzle rows of this line type recording head, by installing charge deflection electrodes facing the nozzle holes and deflecting the ejected ink particles. Ink particle deflection line scanning on-demand ink jet that enables multiple particles to be arranged, prevents recording defects due to nozzle failure, dramatically improves recording reliability, and improves recording unevenness A printer has been proposed.
[0006]
By the way, in the on-demand ink jet line type recording head, unlike the continuous ink jet system in which the ink particles are ejected from each nozzle at any time, the ink particles are ejected when the recording dots need to be formed in accordance with the recording data. For this reason, there is a problem that the ink near the nozzle hole is dried and the ejection of the recording dots becomes unstable, and an ink jet recording apparatus having a preliminary ejection device that solves this problem has been proposed.
[0007]
A conventional preliminary ejection apparatus interrupts recording and moves the recording head to a place where ink is received, and performs preliminary ejection there. Also, since it takes time to move the recording head to the place where the ink receiver is located, in order to reduce this time loss, Japanese Patent Laid-Open No. 2000-2111159 discloses that the ink receiver is attached to the head and the recording paper without moving the head. An apparatus for moving between them is disclosed. In Japanese Patent Laid-Open No. 11-334106, an ink receiver is installed between the recording paper and the recording head at a position deviated from the ink ejection direction, and an air flow or electrostatic force acts on the preliminary ejection particles when performing preliminary ejection. Thus, an apparatus that shields the adhesion of preliminary ink particles to a recording sheet with an ink receiver is disclosed.
[0008]
On the other hand, an ink jet recording apparatus that performs preliminary ejection without interrupting the recording operation has been proposed. In this ink jet recording apparatus, preliminary ejection ink particles ejected from nozzle holes formed on the recording head at a timing different from the recording ink particles adhering to the recording paper are caused to make a U-turn flight by a gradient electric field. The electrode is collected in an electrode near the nozzle hole.
[0009]
[Problems to be solved by the invention]
As described above, the conventional inkjet recording apparatus that performs the preliminary ejection operation without interrupting the recording operation prevents the preliminary ejection ink particles from adhering to the recording paper at a position facing the nozzle holes formed on the recording head. A gradient electric field is generated, the preliminary discharge ink particles are caused to make a U-turn flight by the gradient electric field, and the preliminary discharge ink particles are landed on an ink receiver installed in the U-turn flight path and collected.
[0010]
Therefore, the atmosphere between the recording head and the recording paper is in a high humidity state due to the pre-discharge ink particles flying in the U-turn and the pre-discharge ink particles landing on the ink receiver. When the paper is stopped, there is a problem that the recording paper absorbs moisture and deforms.
[0011]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an inkjet recording apparatus that performs a preliminary ejection operation without interrupting the recording operation, and in which the recording paper does not deform due to moisture absorption.
[0012]
In order to solve the above-described problems, in the present invention, an ink jet which forms an image on a recording medium and performs preliminary ejection on the recording medium using a line type recording head fixed in the paper width direction. In the recording apparatus, the recording medium is moved or retracted when preliminary ejection is performed.
[0013]
Further, the recording medium is moved to a position facing and close to the nozzle hole formed in the line type recording head fixed in the paper width direction, and the ink ejected from the nozzle hole starts from the vicinity where it is separated into ink particles. Over the flight path, recording ink particles that land on the recording medium by an inclined electric field inclined from the ink discharge direction, or preliminary discharge ink that makes a U-turn flight in the direction toward the nozzle hole by being charged and deflected by the inclined electric field. the particle deflection ink jet recording apparatus for generating particles, provided a recording medium movement control means for controlling the moving direction and the moving speed of the recording medium, the U-turn the refresh ink particles while moving the recording medium It is made to fly.
[0014]
Further, when the recording medium is continuous paper during the U-turn flight of the preliminary ejection ink particles, the recording medium movement control means reciprocates the recording medium.
[0015]
Further, when the recording medium is a cut sheet during the U-turn flight of the preliminary ejection ink particles, the recording medium movement control means retracts the recording medium in a region other than the area under the recording head. To do.
[0016]
As a result, the recording paper is not exposed to a high humidity atmosphere for a long time, so that the recording paper is not deformed by moisture absorption.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Examples of the present invention will be described below with reference to the drawings.
[0018]
FIG. 1 shows an ink particle deflection type on-demand line type ink jet printer according to the present invention. FIG. 2 is an enlarged perspective view of the recording head module 10 from the nozzle hole side.
[0019]
The ink particle deflection type on-demand line type ink jet printer according to this example is provided with a gradient electric field generating orifice electrode and an ink receiver which are attached to each of the recording head modules 10 and serve both as a gradient electric field generation and a preliminary discharge ink particle ink receiver. 11 and a recording head module mounter 20 having a plurality of recording head modules 10 mounted thereon, a sheet back electrode 30 installed on the back surface of the recording sheet 60, and a charge deflection control for supplying a charging deflection signal to the sheet back electrode 30. A signal generation circuit 40, a preliminary ejection signal generation circuit 56 for generating preliminary ejection ink particles, a paper movement control circuit 65 for controlling the moving speed and moving direction of the recording paper 60, and a paper movement motor 66 for moving the recording paper 60. Prepare.
[0020]
The ink particles are ejected from the nozzle holes 12 of the recording head module 10 according to the recording signal input data, charged and deflected by the gradient electric field, and landed (attached) on the recording paper 60 moving in the direction of the arrow A, thereby recording dots. The desired recording composed of 70 can be performed. The ink particles ejected from the nozzle hole 12 according to the output of the preliminary ejection signal generation circuit 56 are deflected by a gradient electric field, fly U-turns, land on the orifice electrode / ink receiver 11 and collected.
[0021]
The recording head module 10 is an on-demand ink jet line type recording head module, and is composed of n nozzle elements. Each nozzle element is arranged at a predetermined pitch on the orifice plate 13 of a conductive member such as a metal shown in FIG. The n nozzle holes 12 arranged in a shape are openings. Although each nozzle element is not shown in the drawing, an ink pressurizing chamber having the nozzle hole 12 as an open end, an ink inflow hole for introducing ink into the ink pressurizing chamber, and a manifold for supplying ink to the ink inflow hole are provided. Prepare.
[0022]
Further, as shown in FIG. 3, an actuator such as a PZT piezoelectric element that changes the volume of the ink pressurizing chamber in accordance with a recording signal is attached at a position facing the nozzle. Each nozzle has the same structure. A drive signal from the ink particle ejection control signal generating device 50 is supplied to the PZT piezoelectric element of each nozzle element, and ink particles are ejected from each nozzle hole 12 in accordance with the recording signal. For example, about 10 ng of ink particles are ejected from the nozzle hole of about 30 μm toward the recording paper 60 at 5 m / s.
[0023]
The ink particle ejection control signal generation device 50 receives the control signal and the recording signal generation circuit 51 that generates the recording control signal based on the timing from the timing signal generation circuit 52 according to the recording signal input data. A PZT drive pulse generation circuit 53 that generates a drive pulse signal for driving each nozzle element PZT of the recording head module 10, and a PZT driver circuit 54 that amplifies the drive pulse signal to power suitable for PZT drive. Prepare. Based on the recording signal input data and the information signal from the recording signal generation circuit 51, the ejection state of the recording dot forming ink particles from each nozzle hole 12 of each recording head module 10 is monitored, and no recording dot is formed. When this state continues, a preliminary ejection signal generation circuit 56 for generating a PZT drive signal for ejecting ink particles for preliminary ejection is provided.
[0024]
The gradient electric field generating orifice electrode / ink receiver 11 is, for example, a metal plate having a thickness of about 0.5 mm, and this plate extends along the nozzle hole array on the upper surface of the orifice plate as shown in FIG. And about 300 μm apart. The gradient electric field generating orifice electrode / ink receiver 11 is grounded together with the orifice plate 13 and the ink in the nozzle. In addition, an ink receiving ink absorber 111 having a thickness of about 0.2 mm is embedded in the surface of the metal plate. For the ink absorber 111, a plate material made of hardened stainless fiber or a plate material of a porous stainless steel sintered body can be used. An ink suction pipe 112 is attached to the end of the recording head module of the ink receiving ink absorber 111, and the ink of the ink absorber 111 is sucked out by the ink suction pipe 112 through the capillary.
[0025]
The paper back electrode 30 is a flat plate formed of a conductive member such as metal, and is opposed to the orifice plate 13 of each recording head module 10 and at a position approximately 1.5 mm away from the orifice surface and parallel to the orifice surface. Installed. A charge deflection signal from the charge deflection control signal generation circuit 40 is applied to the electrode 30.
[0026]
The charge deflection control signal generation circuit 40 is configured to generate a predetermined charge deflection signal 41 based on the timing from the timing signal generation circuit 52 and the control signal from the recording signal creation circuit 51, and the charge deflection signal. The back electrode driver circuit 42 amplifies the signal from the generation circuit 41 to a predetermined voltage.
[0027]
Next, an ink particle deflection type on-demand line type ink jet printer used in the present invention will be described.
[0028]
FIG. 3 is an enlarged cross-sectional view of the vicinity of a nozzle of an ink particle deflection type on-demand line type ink jet printer according to the present invention. The gradient electric field generating orifice electrode 11 and the orifice plate 13 are conductors and are grounded. Since the charge signal voltage from the charge deflection control signal generation circuit 40 is applied to the paper back electrode 30, there is no gap between these electrodes. An electric field is formed.
[0029]
FIG. 4 shows an equipotential surface 80 between the orifice plate 13 with the gradient electric field generating orifice electrode 11 and the paper back electrode 30 in the case of the operating condition as shown in FIG. As can be seen from this example, the direction of the electric field is inclined from the ink discharge direction in the vicinity of the flight trajectory of the ink particles ejected from the nozzle holes when the electric field is not applied, that is, the non-deflected ink particle flight trajectory 90. Is forming.
[0030]
Therefore, in FIG. 3, if the ink particle 14 discharged from the nozzle hole is charged by the charge deflection control signal generation circuit 40 by applying a PZT drive pulse from the ink particle discharge control signal generating device 50 to the PZT 55, the charged ink particle Is a gradient electric field and is deflected in a direction perpendicular to the non-deflected ink particle flight trajectory 90, that is, a direction perpendicular to the ink ejection direction. As can be seen from FIG. 4, in such an electrode arrangement, the direction of the gradient electric field is more orthogonal to the non-deflected ink particle flight trajectory 80 in the early stage of ink particle flight. Accordingly, a large deflection force can be applied from the initial flight stage of the ink particles 14.
[0031]
FIG. 5 shows deflection control of ink particles 14 ejected from a single nozzle hole 12 to obtain a recording pattern as shown in (a), and generation of preliminary ejection particles as shown in (a ′) to control U-turn flight. It is a figure explaining recording operation in the case of doing. (B) is a PZT drive pulse signal from the ink particle ejection control signal generating device 50 for controlling ejection of ink particles, and (c) is a charge deflection control signal from the charge deflection control signal generation circuit 40.
[0032]
When the pulse b1 is applied in the waveform (b), ink particles are ejected from the nozzle holes with a slight delay from this timing. At this time, c1 is applied in the waveform (c). That is, the back electrode is +1 kV. Therefore, the ink particles ejected at b1 are negatively charged. Accordingly, in (c), this particle becomes −1 kv during the flight toward the recording paper and flies in the deflection electric field by the gradient electric field, so that it receives the deflection force by the gradient electric field and moves at a constant speed in the direction of arrow A. The recording dot a1 in (a) is formed on the recording paper. That is, the flight trajectory of the ink particles follows the flight trajectory 92 in FIG. In this case, the flying speed of the ink particles is somewhat reduced during the deflection flight.
[0033]
Next, at time T2 after the elapse of time T, when the pulse b2 in (b) is applied, the ink particles are ejected from the nozzle holes with a slight delay from this timing. The potential is −1 kV, and this voltage is applied to the back electrode. Therefore, the ink particles ejected at b1 are charged to a predetermined positive charge amount. The charged particles are subjected to a deflection force while flying toward the recording paper by a gradient electric field formed by (c) waveform of −1 kV, and follow the flight trajectory 91 in FIG. The recording dot a2 in (a) is formed on the recording paper that moves at a constant speed in the direction. In this case, the flying speed of the ink particles is somewhat accelerated during the deflection flight.
[0034]
At time T3 after the next time T elapses, no pulse is applied as in (b), so that no ink particles are ejected, and no recording dot is formed at the position a3 in (a). Ink particles are not ejected at times T4 and T5 after the elapse of the next time T, and no recording dots are formed at positions a4 and a5 in FIG.
[0035]
At time T6, the ink particles generated at b6 are positively charged at −1 kV and deflected by the gradient electric field to form the recording dots at the position a6, as in the case where the recording dots are formed at the position a2.
[0036]
By repeating these recording operations, desired recording can be obtained on the recording paper as shown in FIG.
[0037]
The operation in the section in which ink particles are ejected to form recording dots has been described above, but ink is not ejected from the nozzle holes in the recording dot non-formation section 1 in which blanks are recorded. If the ink in the vicinity of the nozzle hole dries during this period, the ink viscosity increases, and the recording ink particles generated at the beginning of the recording dot re-forming section become unstable and cannot be recorded accurately.
[0038]
Therefore, in this example, in FIG. 5, the ink particles for preliminary ejection are generated at the timing when the recording dots are not formed as shown at times T7 and T8. That is, the ejection drive signals b7 and b8 are applied. These drive signals are set to have smaller signal amplitudes than b1 and b2. Therefore, for example, the recording particles have a weight of 10 ng and a discharge speed of about 5 m / s, whereas the preliminary discharge ink particles have a weight of 7 ng and a discharge speed of about 2.5 m / s, and are discharged at a light weight and a low speed. These particles are set to be charged at +1 kV as in c7 and c8, and to be negatively charged. Therefore, these ink particles for preliminary discharge take the preliminary discharge ink particle U-turn flight path 93 like the preliminary discharge ink particles 15 in FIG. Land on the absorber 111. This is because the negatively charged preliminary discharge ink particles initially fly toward the recording paper 60, but are decelerated by the gradient electric field, and then returned to the orifice plate 13 in the reverse direction. This is because the magnetic field is simultaneously deflected in the direction perpendicular to the ink particle ejection direction by the gradient electric field.
[0039]
In addition, the value of the pulse wave heights c7 and c8 of the charge deflection signal for the preliminary ejection ink particles is set higher than the pulse wave height c1 of the charge deflection signal for the recording dot forming ink particles, and the charge amount of the preliminary ejection ink particles is set. Is increased, the preliminary ejection ink particles are more likely to make a U-turn.
[0040]
As described above, the preliminary ejection particles are collected without adhering to the recording paper. This preliminary discharge suppresses an increase in ink viscosity at the nozzle hole, so that the initial recording ink particles generated at T9 and T10 when entering the recording dot re-forming section are also generated normally and stably. Recording dots can be formed at positions a9 and a10.
[0041]
As can be seen from the operation principle described above, the preliminary ejection device according to the present invention can accurately control one preliminary ejection ink particle and one preliminary ejection ink particle at a necessary time. It is possible to generate as many as possible. Further, it can be generated even when the recording dots are not formed as in T11 even in the recording dot re-formation section, and a necessary amount of preliminary discharge operation can be performed at a necessary time, and the degree of freedom is extremely large.
[0042]
Therefore, it is not necessary to perform the preliminary ejection operation for all the nozzles of the long page width line type recording head at the same time, and the preliminary ejection ink particles are applied at an appropriate time and frequency according to the recording ink particle ejection state of each nozzle. generate. Thereby, it is not necessary to interrupt recording at the time of preliminary ejection, and continuous recording can be performed on continuous paper without reducing the throughput.
[0043]
In addition, since the ink receiver for preliminary ejection is prepared in the orifice electrode for generating the inclined electric field, the ink receiver can be installed without widening the gap between the nozzle of the recording head and the recording paper. It is possible to provide an ink jet recording apparatus provided with a preliminary ejection device suitable for a high-speed line scanning ink jet printer compatible with continuous paper, in which jamming does not easily occur.
[0044]
This highly reliable deflection-on-demand recording operation is performed by setting the interval between nozzle holes, ink particle ejection control from the nozzles, and the deflection direction and deflection amount to predetermined values, thereby ejecting ink from a plurality of different nozzle holes. The ink droplets can be deflected and ink particles can be applied multiple times at the same pixel position or a position in the vicinity thereof. Thereby, even if one nozzle breaks down and printing dots cannot be formed, a highly reliable ink jet recording apparatus that can be backed up by other nozzles can be configured. In addition, since one pixel is formed by a plurality of nozzles, it is possible to reduce recording unevenness and solve an essential problem in a line type ink jet printer.
[0045]
Next, an example of the present invention will be described.
[0046]
In the line type ink jet printer described above, the atmosphere between the nozzle holes 12 formed in the recording head module 10 and the recording paper 60 as shown in FIG. The pre-discharge ink particles that land on the ink absorber 111 become highly humid. For this reason, if the recording paper 60 continues to be stopped between print jobs or the like, the recording paper 60 absorbs moisture and expands and deforms. When recording is performed on the recording paper 60 in a deformed state, the quality of the recorded image is significantly reduced.
[0047]
Therefore, as shown in FIG. 1, a paper movement control circuit 65 for controlling the moving speed and moving direction of the recording paper 60 according to the paper movement data is provided, and the recording paper 60 is in a stopped state between recording. In this case, the preliminary ejection ink particles 15 are caused to make a U-turn flight while moving the recording paper 60 at a moving speed lower than that at the time of recording.
[0048]
FIG. 7 shows the relationship between recording dot formation and paper movement.
[0049]
Recording dot non-forming section 2 is a section between jobs, contained in the job interval recording dots formed section and the recording dot non-formation section 1 in FIG. (a) is the moving speed of the recording paper 60 in the paper movement example 1, and (b) is the moving speed in the paper movement example 2. In the job section, the recording paper 60 moves at the moving speed V1 in the moving direction (forward direction) during normal recording. The job section includes the recording dot formation section and the recording dot non-formation section 1 shown in FIG. 5. In the recording dot non-formation section 1, the U-turn flight is performed by the ink particles for preliminary ejection. Is moving at the moving speed V1, the recording paper 60 does not absorb moisture.
[0050]
In a recording dot non-formation section 2 between jobs, the movement is first performed in the forward direction at a movement speed V2 smaller than the movement speed V1 during recording, and then moved in the reverse direction at the movement speed V2. Thus, the reason why the recording paper 60 is returned by the amount moved in the forward direction in the recording dot non-formation section 2 is to avoid generating a useless blank area between jobs. The moving speed V2 in the recording dot non-forming section 2 may be any moving speed that does not absorb the recording paper. Further, the reciprocating movement to the extent that the recording paper does not absorb moisture as in (b) may be repeated several times. Further, the moving speed at the time of reciprocating movement of the recording paper may be different from the moving speed at the time of returning.
[0051]
According to this example, since the recording paper 60 is moved when the preliminary ejection ink particles fly U-turn to the recording dot non-formation section 2 between jobs, the recording paper 60 is deformed by moisture absorption. There is nothing.
[0052]
In the above description, the recording paper 60 has been described as continuous paper. However, in the case of cut paper, the same effect can be obtained by controlling the recording paper so that it does not exist in the high-humidity area below the recording head.
[0054]
【The invention's effect】
As described above, the present invention provides a line type recording head fixed in the paper width direction, and an ink jet recording apparatus using a recording head that performs preliminary ejection without causing the ejected ink particles to adhere to the paper. since moving or retract the paper, the recording paper is lower line-type recording head, without being 曝 prolonged to the atmosphere of high humidity, the recording sheet is not deformed by moisture absorption, to improve the printing quality it can.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an ink particle deflection type on-demand line type inkjet printer according to an example of the present invention.
FIG. 2 is a partially enlarged view of a recording head module according to an example of the present invention.
FIG. 3 is an enlarged cross-sectional view for explaining the operation of an ink particle deflection type on-demand line type ink jet printer according to the present invention.
FIG. 4 is a schematic cross-sectional view showing an equipotential surface between an orifice plate with a gradient electric field generating orifice electrode and a paper back electrode.
FIG. 5 is a timing chart for explaining a recording operation when preliminary discharge particles are generated and U-turn flight control is performed.
FIG. 6 is a partially enlarged view for explaining a problem that a recording sheet is deformed.
FIG. 7 is a timing diagram for explaining a recording sheet moving method during a preliminary ejection operation according to the present invention.
[Explanation of symbols]
10 is a recording head module, 11 is an orifice electrode and ink receiver for generating a gradient electric field, 111 is an ink absorber for receiving ink, 112 is an ink suction pipe, 12 is a nozzle hole, 13 is an orifice plate, 14 is ink particles, and 15 is Preliminary ejection ink particles, 20 is a recording head module mounter, 30 is a paper back electrode, 40 is a charge deflection control signal generation circuit, 41 is a charge deflection signal generation circuit, 42 is a back electrode driver circuit, and 50 is an ink particle ejection control signal generation. Device, 51 is a recording signal generation circuit, 52 is a timing signal generation circuit, 53 is a PZT drive pulse generation circuit, 54 is a PZT driver circuit, 55 is PZT, 56 is a preliminary ejection signal generation circuit, 57 is a preliminary ejection signal stop circuit, 60 is a recording sheet, 65 is a sheet movement control circuit, 66 is a sheet movement motor, 70 is a recording dot, 80 Equipotential surface, 85 is a gradient electric field, 90 is a non-deflected ink particle flight trajectory, 91 is a positively charged deflected ink particle flight trajectory, 92 is a negatively charged deflected ink particle flight trajectory, 93 is a preliminary discharge ink particle U-turn flight trajectory, A Is the recording paper feed direction.

Claims (6)

In an ink jet recording apparatus that uses a line-type recording head fixed in the paper width direction to form an image on a recording medium and perform preliminary ejection on the recording medium , a recording dot that performs only the preliminary ejection An ink jet recording apparatus, wherein a paper conveyance speed V2 of the recording medium in a non-formation section is smaller than a paper conveyance speed V1 of the recording medium in a recording dot formation section in which image formation is performed based on a print job . A recording medium is moved to a position facing and close to a nozzle hole formed in a line type recording head fixed in the paper width direction, and the ink ejected from the nozzle hole is a flight path from the vicinity where it is separated into ink particles. Recording ink particles landing on the recording medium by an inclined electric field inclined from the ink discharging direction, or preliminary discharging ink particles which are charged and deflected by the inclined electric field and fly U-turn toward the nozzle hole side. In the particle deflection type inkjet recording apparatus to be derived,
Ink jet recording, characterized in that the recording member movement control means for controlling the moving direction and the moving speed of the recording medium is provided, the refresh ink particles wherein while moving the recording medium was set to be U-turn flight apparatus.   The recording medium movement control means determines a movement speed V2 when the recording medium is moved when the preliminary ejection ink particles are ejected from a moving speed V1 of the recording medium when the recording ink particles are ejected. 2. The ink jet recording apparatus according to claim 1, wherein the ink jet recording apparatus is controlled to be smaller.   The recording medium movement control means moves the recording medium in the forward direction when moving the recording medium when ejecting the preliminary ejection ink particles, and then in the reverse direction by the amount moved in the forward direction. 3. The ink jet recording apparatus according to claim 1, wherein the ink jet recording apparatus is controlled to move. 4. The recording medium movement control means, when the recording medium is continuous paper, controls to repeat the forward movement and the backward movement a plurality of times . Inkjet recording device. A recording medium is moved to a position facing and close to a nozzle hole formed in a line type recording head fixed in the paper width direction, and the ink ejected from the nozzle hole is a flight path from the vicinity where it is separated into ink particles. Recording ink particles landing on the recording medium by an inclined electric field inclined from the ink discharging direction, or preliminary discharging ink particles which are charged and deflected by the inclined electric field and fly U-turn toward the nozzle hole side. In the particle deflection type inkjet recording apparatus to be derived,
A recording medium movement control means for controlling the movement of the recording medium is provided, and when the recording medium is a cut sheet, the recording medium movement control means is used when the preliminary ejection ink particles are made to make a U-turn flight. an ink jet recording apparatus characterized by controlling so as to retract said recording body other than the region under the line-type recording head.

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