JP2007001721A - Recording medium carrying device and image recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry a recording sheet of paper by obtaining a stable attraction force on the surface of a transport belt with a low-cost constitution. <P>SOLUTION: A recording medium carrying device has a charging roll 32 to rotate, and in the contacting part of the surface of the carrying belt 24, the surface of the carrying belt 24 is charged by the high potential portion of a high potential electrode member 50A alternately while the surface potential of the carrying belt 24 is put in zero by the zero potential portion of a zero potential electrode member 50B. By these electrode members 50A and 50B of the charging roll 32, a discrete electric charge distribution in striation is formed on the surface of the carrying belt 24. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a recording medium conveying apparatus and an image recording apparatus, and more particularly to a recording medium conveying apparatus that charges a belt that conveys a recording medium and an image recording apparatus including the recording medium conveying apparatus.

  Conventionally, in an ink jet recording apparatus, when ink liquid is ejected to one line in the main scanning direction by the ink jet head, the recording medium is transported by a predetermined amount in the sub scanning direction, and ink droplets are ejected to the next line again by the ink jet head. Thus, an image is formed on the recording medium.

  Since the recording medium needs to be accurately conveyed by a predetermined amount, the conveying belt is charged and the recording medium is attracted to the surface of the conveying belt by static electricity and conveyed. As a method for charging the conveyance belt, a method for uniformly charging the surface of the conveyance belt with a DC voltage is known. However, if the surface of the conveyance belt is uniformly charged, the influence of the charge on the inkjet head becomes large. There is a problem that.

2. Description of the Related Art As an apparatus for reducing the influence of charge on an ink jet, an adsorption device such as a sheet member that forms an alternating charge density pattern on the surface of a conveyor belt using an AC power source is known (Patent Document 1).
Japanese Patent No. 2897960

  However, in the suction device such as a sheet member described in Patent Document 1, an expensive AC power source that can apply an AC voltage that changes at a high frequency is required during high-speed conveyance of paper, and an AC voltage that changes at a high frequency is required. Since noise is generated in the waveform, there is a problem that a stable suction force cannot be obtained.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a recording medium conveying apparatus and an image recording apparatus that can obtain a stable suction force with an inexpensive configuration.

  In order to achieve the above object, a recording medium transporting apparatus according to the present invention comprises a transporting means for transporting a recording medium, a power supply means for supplying DC power, and a high potential connected to the power supply means. The transporting device includes a potential electrode and a low potential electrode that has a low potential lower than the high potential, and the transporting means forms a discrete charge distribution on the surface of the transporting means by the high potential electrode and the low potential electrode. And charging means for charging the means.

  According to the present invention, the DC power is supplied to the high potential electrode by the power supply means, and the high potential electrode is set to the high potential. Further, the transporting means is charged by the charging means so that a discrete charge distribution is formed on the surface of the transporting means by the high potential electrode and the low potential electrode.

  Then, the recording medium is adsorbed on the surface of the conveying means by discrete charge distribution, and the recording medium adsorbed on the surface is conveyed by the conveying means.

  Therefore, the high potential electrode and the low potential electrode supplied with the DC power supply charge the transport means so that a discrete charge distribution is formed on the surface of the transport means. Obtainable.

  Further, the charging means according to the present invention is formed on the high potential electrode at least one high potential portion that is one of a contact portion that contacts the surface of the transport means and a facing portion that faces the surface of the transport means, The low potential electrode can be formed by forming at least one low potential portion that is one of the contact portion and the facing portion.

  Further, the charging means according to the present invention can be configured by discretely arranging the high potential portion of the high potential electrode and the low potential portion of the low potential electrode.

  Further, the charging means according to the present invention may be configured by discretely arranging the high potential portion of the high potential electrode and the low potential portion of the low potential electrode so as to be either a stripe shape or a lattice shape. it can.

  In addition, the charging unit according to the present invention is configured such that a high-potential electrode that charges the transport unit so that a uniform charge distribution is formed on the surface of the transport unit, and a transport in which a uniform charge distribution is formed by the high-potential electrode. The conveying means can be composed of a low-potential electrode that removes electricity so that a discrete charge distribution is formed on the surface of the means. Accordingly, since the high potential electrode may be configured to form a uniform charge distribution, the configuration of the charging unit can be simplified.

  Further, the charging means according to the present invention can be arranged such that the low potential portions of the low potential electrode are discretely arranged.

  In addition, the charging means according to the present invention can be arranged discretely so that the low potential portion of the low potential electrode is either in the form of stripes or lattices.

  An image recording apparatus according to the present invention includes the above-described recording medium transport apparatus and image recording means for recording an image on the recording medium.

  According to the image recording apparatus of the present invention, the image is recorded on the recording medium by the image recording unit while the recording medium adsorbed on the surface is conveyed by the conveying unit of the recording medium conveying apparatus as described above.

  Therefore, it is possible to obtain a stable suction force on the surface of the conveying means with an inexpensive configuration, and to record an image while adhering the recording medium to the surface of the conveying means and transporting it. can do.

  As described above, according to the recording medium transport apparatus and the image recording apparatus of the present invention, a discrete charge distribution is formed on the surface of the transport means by the high potential electrode and the low potential electrode supplied with DC power. As described above, since the conveying means is charged, an effect that a stable adsorption force can be obtained with an inexpensive configuration is obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiment of the present invention, a case where the present invention is applied to an ink jet recording apparatus will be described as an example.

  As shown in FIG. 1, the inkjet recording apparatus 10 according to the first embodiment includes an inkjet head unit 12 that ejects ink droplets onto a recording paper P. The inkjet head unit 12 includes cyan (C), An ink jet head (not shown) that ejects ink droplets of four colors of magenta (M), yellow (Y), and black (K) from the nozzles is provided. The ink jet head is a long head having an effective print area that is equal to or larger than the width of the recording paper P, and ejects ink droplets all at once in the print area in the width direction of the recording paper P. In addition, as a method of ejecting ink droplets from the nozzles of the inkjet head, a known method such as a method of pressurizing the ink chamber with a piezoelectric element or a thermal method can be applied. A main scanning mechanism that moves the ink jet head in the main scanning direction may be provided in the ink jet head unit 12, and an ink jet head having an effective print area smaller than the width of the recording paper P may be applied.

  Ink is supplied from an ink tank (not shown) disposed above the ink jet head unit 12 to the ink jet head through a pipe. The ink type is a known ink such as water-based ink, oil-based ink, or solvent-based ink. Applicable.

  A paper feed tray 16 is detachably provided at the bottom of the ink jet recording apparatus 10. A recording paper P is loaded on the paper feed tray 16, and a pick-up roll 18 is placed on the uppermost recording paper P. Are in contact. The recording paper P is fed one by one from the paper feed tray 16 to the downstream side in the transport direction by the pick-up roll 18 and is fed below the inkjet head unit 12 by the transport rolls 20 and 22 arranged in order along the transport path. Paper.

  Further, an endless transport belt 24 is disposed below the inkjet head unit 12, and the transport belt 24 is stretched around a drive roll 26 and a driven roll 30. Further, the driven roll 30 is grounded.

  In addition, the conveyance belt 24 is shape | molded by resin, such as rubber | gum, such as urethane, and PET, ETFE, PI as an example.

  Further, on the upstream side of the position where the recording paper P contacts the conveyance belt 24, a charging roll 32 to which a DC power supply 34 for supplying DC power is connected is disposed. The charging roll 32 is driven while sandwiching the conveyance belt 24 with the driven roll 30, and is movable between a contact position in contact with the conveyance belt 24 and a separation position separated from the conveyance belt 24. At the contact position, a predetermined potential difference is generated between the grounded driven roll 30 and, therefore, the transport belt 24 is discharged and given an electric charge. The DC power supplied by the DC power supply 34 is, for example, 1000 to 3000V.

  As shown in FIGS. 2A and 2B, the charging roll 32 is provided at the central portion of the high-voltage electrode 60 connected to the DC power supply 34 and the charging roll 32 and is grounded. The shaft 54 is connected to the DC power supply 34 through the high voltage electrode 60 to become a high potential, and the high potential electrode member 50A for charging the surface of the transport belt 24 and the shaft 54 is connected to zero. And a zero-potential electrode member 50 </ b> B that becomes a potential.

  On the outer peripheral surface of the charging roll 32 that contacts the surface of the transport belt 24, a high potential portion that is a portion that contacts the transport belt 24 of the high potential electrode member 50A and a portion that contacts the transport belt 24 of the zero potential electrode member 50B. The high potential portion and the zero potential portion have a rectangular shape in which the axial direction of the charging roll 32 is the length direction, and the charging roll 32 has a striped shape in the axial direction. Thus, the high potential portions and the zero potential portions are alternately and discretely arranged.

  An insulating member 58 is provided between the shaft 54 and the high voltage electrode 60.

  Further, as shown in FIG. 2C, an insulating member 52 is disposed between the high potential electrode member 50A and the zero potential electrode member 50B. The electrode pitch between the high potential portion of the adjacent high potential electrode member 50A and the zero potential portion of the zero potential electrode member 50B is, for example, 8 mm.

  The high-potential electrode member 50A and the zero-potential electrode member 50B are elastic members, preferably having the same degree of elasticity, and may have the same material composition. For example, the high potential electrode member 50A and the zero potential electrode member 50B include urethane resin, thermoplastic elastomer, epichlorohydrin rubber, ethylene-propylene-diene copolymer rubber, silicon rubber, acrylonitrile-butadiene copolymer rubber, Linol. A resin material such as Bonnen rubber is used alone or as a mixture of two or more, and a desirable material is a urethane foam resin. As the urethane foam resin, a urethane resin in which hollow bodies such as hollow glass beads and thermal expansion microcapsules are mixed and dispersed to give a closed cell structure is desirable. Such a urethane foam resin is desirable as the charging roll 32. It has low hardness elasticity, high contact stability with respect to the conveyor belt 24, and good nip formation. Furthermore, the high potential portion of the high potential electrode member 50A and the zero potential portion of the zero potential electrode member 50B may be covered with a water-repellent skin layer having a thickness of 5 to 100 μm. This is effective in suppressing characteristic changes (resistance value changes) due to ink mist adhering to the surface of the charging layer.

  The shaft 54 is made of, for example, aluminum or stainless steel, and has a rod shape or a pipe shape.

  Further, on the upstream side of the charging roll 32, a static elimination roll 36 for neutralizing the charge charged on the transport belt 24 is provided.

  Further, a plurality of discharge roll pairs 40 constituting a discharge path for the recording paper P are provided on the downstream side of the inkjet head unit 12, and a discharge tray 42 is provided at the end of the discharge path formed by the discharge roll pairs 40. Is provided.

  The inkjet recording apparatus 10 controls the entire inkjet recording apparatus 10 including an inkjet head unit 12, a charging roll 32, and a plurality of motors (not shown) for driving various rolls, and includes a CPU, a ROM, and a RAM. A control unit 56 is provided.

  Next, the printing operation of the inkjet recording apparatus 10 will be described. First, when receiving a print job command, the control unit 56 drives the pickup roll 18, all the transport rolls, and the transport belt 24 to send out the recording paper P from the paper feed tray 16. Furthermore, a head control unit (not shown) that performs dummy jets, initializes the performance of the nozzles of the inkjet head unit 12, and controls the ejection of ink droplets by the inkjet head unit 12 is applied to the piezoelectric elements of the nozzles corresponding to image signals. A drive voltage is applied at a timing according to the image signal.

  As a result, the recording paper P conveyed by the conveying belt 24 is printed. This printing process will be described in detail later. Then, the printed recording paper P is transported to the paper discharge tray 42 by the transport belt 24 and the discharge roll pair 40.

  Here, the printing process will be described. First, when receiving a print job, the control unit 56 turns on the charging roll 32, applies a DC voltage from the DC power supply 34 to the charging roll 32, and sets the high potential electrode member 50A to a high potential.

  Then, while rotating the charging roll 32, as shown in FIG. 3, the surface of the conveyor belt 24 is alternately charged by the high potential portion of the high potential electrode member 50A at the contact portion of the surface of the conveyor belt 24, The potential of the surface of the conveyor belt 24 is set to zero potential (GND level) by the zero potential portion of the zero potential electrode member 50B. Further, since the back surface of the conveyor belt 24 is in contact with the grounded driven roll 30, the potential of the back surface of the conveyor belt 24 becomes zero potential.

  By the high potential electrode member 50 </ b> A and the zero potential electrode member 50 </ b> B of the charging roll 32, a discrete charge distribution in the form of stripes as shown in FIG. 4 is formed on the surface of the transport belt 24. This charge distribution is a striped charge distribution in a direction perpendicular to the rotation direction, in which charge-charged portions and no-charge portions are alternately formed with respect to the rotation direction of the conveyor belt 24. A uniform charge distribution is formed in the direction orthogonal to the rotation direction of the belt 24.

  The recording paper P is stably electrostatically adsorbed on the surface of the conveying belt 24 by the stress (Maxwell stress) due to the non-uniform electric field of the charge distribution. Further, since the charged portion and the non-charge portion are alternately formed, the electric field in the space on the transport belt 24 is weak, and the influence on the ink droplet ejection by the ink jet head unit 12 is reduced, and recording is performed. The influence of variations in the attractive force due to the charging characteristics of each material of the paper P is reduced.

  As a result, the recording paper P fed to the transport belt 24 is electrostatically attracted to the transport belt 24 and transported line by line in the print area of the inkjet head unit 12. At that time, the control unit 56 operates the inkjet head unit 12 to print on the recording paper P, and the recording paper P is discharged onto the paper discharge tray 42 by the discharge roll pair 40. Further, the portion of the conveyance belt 24 on which the recording paper P is adsorbed is moved to the contact portion of the static elimination roll 36 by the drive roll 26 and the driven roll 30, and the surface of the conveyance belt 24 is neutralized to remove the remaining charge. It is. Then, it moves to the contact portion of the charging roll 32, and the high-potential electrode member 50A and the zero-potential electrode member 50B alternately form charge-charged portions and no-charge portions, and the charge distribution is formed on the surface of the transport belt 24. Formed again.

  In the above, the high potential portions and the zero potential portions are discretely arranged in stripes in the rotation direction so that the high potential electrode members 50A and the zero potential electrode members 50B appear alternately on the outer peripheral surface of the charging roll 32. Although the case has been described as an example, as shown in FIG. 5A, on the outer peripheral surface of the charging roll 32, the high potential electrode member 50A and the zero potential electrode member 50B are alternately arranged with respect to the direction orthogonal to the rotation direction. As it appears, the high potential portion and the zero potential portion may be discretely arranged in a stripe shape in the rotating direction. In this case, a discrete charge distribution is formed on the surface of the transport belt 24 in a striped pattern in the rotational direction as shown in FIG. 6A, and is uniform in the rotational direction of the transport belt 24. A charge distribution portion is formed, and charge-charged portions and no-charge portions are alternately formed in a direction perpendicular to the rotation direction. The high potential electrode member 50A and the zero potential electrode member 50B are provided spirally with respect to the axis of the charging roll 32, and the high potential portion of the high potential electrode member 50A and the zero potential electrode are provided on the outer peripheral surface of the charging roll 32. You may arrange | position the zero electric potential part of the member 50B discretely.

  In this case, since the charge distribution formed on the surface of the conveyance belt 24 is uniform with respect to the conveyance direction of the recording paper P, as shown in FIG. Even when there is a curl or the like at the leading edge (Feed edge) of the recording paper P, the occurrence of recording paper jam can be avoided without causing separation due to the uniform adsorption force.

  Further, on the outer peripheral surface of the charging roll 32, as shown in FIG. 5B, the high potential portion and the zero potential portion so that the high potential electrode member 50A and the zero potential electrode member 50B appear in a lattice shape (island shape). May be arranged in a grid pattern and discretely. In this case, a grid-like discrete charge distribution as shown in FIG. 6B is formed on the surface of the transport belt 24, and the charged portion and the non-charge portion are uniform on the entire surface of the transport belt 24. It has come to be distributed.

  In this case, since the charge distribution is uniform with respect to the entire surface of the transport belt 24, the sheet adsorbing force is uniform over the entire surface of the recording sheet P, and recording is performed as in the case of FIG. Even when the leading edge of the paper P is curled or the like, the occurrence of recording paper jam can be avoided without causing separation due to the uniform distribution of the attractive force.

  As described above, according to the ink jet recording apparatus according to the embodiment of the present invention, the high potential portion of the high potential electrode member supplied with DC power and the zero potential portion of the zero potential electrode member are discretely arranged. By forming the charging roll, the conveying belt 24 is charged so that a discrete charge distribution is formed on the surface of the conveying belt, so that a stable adsorption force can be obtained with an inexpensive configuration.

  Further, since the recording paper is printed while adsorbing the recording paper onto the surface of the transport belt and transported, it is possible to print on the recording paper with high accuracy.

  Further, since the surface of the conveyor belt is charged using a DC power source, the amount of ozone generated during discharge can be reduced as compared with the case where the surface of the conveyor belt is charged using an AC power source.

  Further, even when the conveying speed of the conveying belt is increased, it is not necessary to change the frequency of the power source, so that it is not necessary to prepare an expensive power supply device.

  In the above embodiment, the case where the charging roll is used has been described as an example, but a blade-shaped charger may be used. In this case, the surface in contact with the conveyor belt may be formed by discretely arranging the high potential portion and the zero potential portion in a stripe pattern in the rotation direction.

  Further, although the case where the charging roll is brought into contact with the conveyance belt to charge the surface of the conveyance belt has been described as an example, a charger that charges the surface of the conveyance belt without being brought into contact with the conveyance belt may be used. In this case, the high-potential portion of the high-potential electrode member and the zero-potential portion of the zero-potential electrode member may be discretely arranged in stripes on the charger portion that faces the surface of the transport belt.

  Moreover, although the case where the high potential electrode member and the grounded zero potential electrode member are used has been described as an example, discrete charges can be obtained by using the high potential electrode member and a low potential electrode member having a negative potential or a low potential. The distribution may be formed on the surface of the conveyor belt.

  Next, a second embodiment will be described. In addition, the same code | symbol is attached | subjected about the same part as 1st Embodiment, and description is abbreviate | omitted.

  As shown in FIG. 8, the inkjet recording apparatus 110 according to the second embodiment includes a charging roll 132A that charges the surface of the conveyor belt 24 and a partial static elimination roll 132B that partially neutralizes the surface of the conveyor belt 24. The point that a discrete charge distribution is formed on the surface of the conveyor belt 24 is different from that of the first embodiment.

  As shown in FIG. 9, a charging roll 132A is disposed upstream of the position where the recording paper P contacts the conveying belt 24. The charging roll 132A is a high potential electrode member 150A connected to the DC power supply 34. Is formed on the entire outer peripheral surface in contact with the surface of the conveyor belt 24, and the conveyor belt 24 is charged so that a uniform charge distribution is formed on the surface of the conveyor belt 24. Yes.

  Further, a partial static elimination roll 132B is disposed between the position where the recording paper P contacts the conveyance belt 24 and the charging roll 132A. The partial static elimination roll 132B is a zero potential portion of the grounded zero potential electrode member 150B. However, on the outer peripheral surface as a portion in contact with the conveyor belt 24, the stripes are discretely arranged in a direction orthogonal to the rotation direction, and the surface of the conveyor belt 24 is discretely discharged.

  Next, the operation of the ink jet recording apparatus 10 according to the second embodiment will be described.

  When receiving the print job, the control unit 56 turns on the charging roll 32, applies a DC voltage from the DC power supply 34 to the charging roll 132A, and sets the high potential electrode member 150A to a high potential. As the charging roll 132A rotates, the high potential portion of the high potential electrode member 150A comes into contact with the surface of the transport belt 24 as shown in FIG. 9, and the surface of the transport belt 24 is moved by the high potential electrode member 150A. To form a uniform charge distribution.

  Then, while the partial static elimination roll 132B rotates, the low potential portion of the zero potential electrode member 150B comes into contact with the surface of the conveyor belt 24, and the surface of the conveyor belt 24 in which a uniform charge distribution is formed is partially covered. Eliminate static electricity and make it zero potential discretely. Further, since the back side of the transport belt 24 is in contact with the grounded driven roll 30, the potential on the back surface of the transport belt 24 becomes zero potential.

  The high-potential electrode member 150A of the charging roll 132A and the zero-potential electrode member 150B of the partial static elimination roll 132B cause a discrete charge distribution in the form of stripes in the direction orthogonal to the rotation direction as shown in FIG. 24 is formed on the surface.

  The recording paper P is stably electrostatically attracted to the surface of the transport belt 24 by the stress due to the non-uniform electric field of the charge distribution, and the recording paper P is transported line by line in the print region of the inkjet head unit 12.

  In the above description, the case where the zero potential portions of the zero potential electrode member 150B are discretely arranged in stripes in the direction orthogonal to the rotation direction on the outer peripheral surface with which the partial static elimination roll 132B contacts is described as an example. As shown in FIG. 10A, the zero potential portions of the zero potential electrode member 150B may be discretely arranged in a striped pattern in the rotation direction on the outer peripheral surface of the partial static elimination roll 132B. In this case, a discrete charge distribution is formed on the surface of the conveyor belt 24 in a stripe pattern in the rotational direction as shown in FIG. A distribution is formed, and charged portions and non-charge portions are alternately formed with respect to the direction orthogonal to the rotation direction. In addition, by providing the zero potential electrode member 150B spirally with respect to the axis of the partial static elimination roll 132B, the zero potential portions of the zero potential electrode member 150B are discretely arranged on the outer peripheral surface of the partial static elimination roll 132B. Also good.

  Further, as shown in FIG. 10B, the zero potential portions of the zero potential electrode member 150B may be discretely arranged in a lattice pattern on the outer peripheral surface of the partial static elimination roll 132B that contacts the surface of the conveyance belt 24. . In this case, a discrete charge distribution is formed on the surface of the conveyance belt 24 on a lattice as shown in FIG. 6B, and the rotation direction of the conveyance belt 24 and the direction orthogonal to the rotation direction are formed. On the other hand, the portion where the uniform charge distribution is formed and the portion where the charge charged portion and the non-charge portion are alternately formed appear alternately.

As described above, according to the ink jet recording apparatus according to the second embodiment, since the high potential electrode member may be configured to form a uniform charge distribution, the configuration of the charging roll can be simplified. In the above-described embodiment, the case where the charging roll and the partial static elimination roll are used has been described as an example. However, a blade-shaped charger and static elimination apparatus may be used. In this case, the surface of the static eliminator that is in contact with the conveyor belt may be formed by discretely arranging the zero potential portion in a striped pattern in the rotational direction.

  In addition, the case where the charging roll and the partial static elimination roll are brought into contact with the conveyance belt to charge and neutralize the surface of the conveyance belt has been described as an example, but the charger and the conveyance that charges the surface of the conveyance belt without contacting the conveyance belt. A static eliminator that neutralizes the surface of the conveyor belt without contacting the belt may be used. In this case, the zero potential portion of the zero potential electrode member may be discretely arranged in a portion facing the surface of the transport belt of the static eliminator.

1 is a schematic diagram illustrating a configuration of an ink jet recording apparatus according to a first embodiment of the present invention. It is (A) front view, (B) side view, and (C) AA 'sectional view showing the configuration of the charging roll according to the first embodiment of the present invention. It is an image figure which showed a mode when the charging roll which concerns on the 1st Embodiment of this invention charges the surface of a conveyance belt. It is an image figure which shows the striped charge distribution formed on the conveyance belt which concerns on the 1st Embodiment and 2nd Embodiment of this invention. In the outer peripheral surface of the charging roll according to the first embodiment of the present invention, the high potential portion and the zero potential portion are (A) an image diagram showing a case where they are arranged in stripes, and (B) a case where they are arranged in a lattice shape. FIG. FIG. 4A is an image diagram illustrating a stripe-shaped charge distribution formed on the conveyance belt according to the first embodiment and the second embodiment of the present invention, and FIG. 5B is an image diagram illustrating a grid-shaped charge distribution. . It is an image figure which shows distribution of the electrostatic attraction force which generate | occur | produces on the surface of the conveyance belt which concerns on the 1st Embodiment of this invention. It is the schematic which shows the structure of the inkjet recording device which concerns on the 2nd Embodiment of this invention. FIG. 6 is an image diagram illustrating a state where a charging roll according to a second embodiment of the present invention charges a surface of a conveyance belt and a partial static elimination roll neutralizes a surface of the conveyance belt. In the outer peripheral surface of the partial static elimination roll according to the second embodiment of the present invention, (A) an image diagram showing a case where zero potential portions are arranged in a striped pattern, and (B) a case where zero potential portions are arranged in a grid. It is an image figure shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 110 Inkjet recording device 12 Inkjet head unit 24 Conveying belt 32, 132A Charging roll 34 DC power supply device 36 Static elimination roll 50A, 150A High potential electrode member 50B, 150B Zero potential electrode member 54 Shaft 60 High voltage electrode 132B Partial neutralization roll

Claims (8)

Conveying means for conveying the recording medium;
Power supply means for supplying DC power;
A high-potential electrode that is connected to the power supply means and has a high potential; and a low-potential electrode that has a low potential lower than the high potential; and the high-potential electrode and the low-potential electrode provide Charging means for charging the transport means so that a discrete charge distribution is formed;
A recording medium conveying apparatus including: Forming at least one high-potential portion on the high-potential electrode, which is one of a contact portion that contacts the surface of the transport unit and an opposing portion that faces the surface of the transport unit;
The recording medium conveying apparatus according to claim 1, wherein at least one low potential portion that is one of the contact portion and the facing portion is formed on the low potential electrode.   The recording medium conveying apparatus according to claim 2, wherein the charging unit is configured by discretely arranging the high potential portion of the high potential electrode and the low potential portion of the low potential electrode.   4. The charging unit is configured by discretely arranging the high potential portion of the high potential electrode and the low potential portion of the low potential electrode so as to be in either a stripe shape or a lattice shape. The recording medium conveying apparatus according to the description.   The high-potential electrode that charges the transporting means so that a uniform charge distribution is formed on the surface of the transporting means, and the transport that has a uniform charge distribution formed by the high-potential electrode. 3. The recording medium conveying apparatus according to claim 2, wherein the recording medium conveying device is constituted by the low-potential electrode for neutralizing the conveying means so that a discrete charge distribution is formed on the surface of the means.   6. The recording medium conveying apparatus according to claim 5, wherein the charging means includes discretely arranging the low potential portions of the low potential electrodes.   The recording medium transporting apparatus according to claim 6, wherein the charging unit is discretely arranged so that the low potential portion of the low potential electrode is in a stripe shape or a lattice shape. A recording medium carrying device according to any one of claims 1 to 7,
Image recording means for recording an image on the recording medium;
An image recording apparatus.

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