JP2006043915A - Image forming method and apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive image forming method and an apparatus in which a high quality recording image is formed while exhibiting excellent conveyance of recording medium by preventing generation of ink mist due to charged electric field, or curved ejection or nozzle down of an ink ejection recording head incident thereto by simple method, manufacture is facilitated by a simple structure, and integration of nozzle is enhanced. <P>SOLUTION: After charging amount of a recording medium (P) being conveyed is reduced partially, ink (I) is ejected to the recording medium (P) thus forming a recording image. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image forming method and an image forming apparatus for forming a recorded image by the image forming method, and more particularly, to an image forming method for forming a recorded image on a recording medium by ejecting ink, and the image The present invention relates to an image forming apparatus such as a copying machine, a facsimile machine, a printer, or a complex machine for forming a recorded image by a forming method.

Conventionally, an image forming method for forming a recorded image on a recording medium by ejecting ink, and an image of a copying machine, a facsimile machine, a printer, or a composite machine for forming the recorded image by the image forming method In the on-demand inkjet (IJ) recording technology of the forming device, a diaphragm is provided on a part of the wall of the liquid chamber filled with ink, and the diaphragm is displaced by a piezoelectric actuator or the like to change the volume in the liquid chamber. There are widely known methods for increasing the pressure and discharging ink, and for providing a heating element that generates heat when energized in the liquid chamber, and for increasing the pressure in the liquid chamber by bubbles generated by the heat generated by the heating element and discharging ink. Yes.
In recent years, inkjet printers have been used in various applications due to the low price of inkjet printers, high image quality, and the spread of personal computers to general households.
Ink jet printers form a recorded image by ejecting ink droplets of several pl to several tens of pl from a small-diameter nozzle having a diameter of about several tens of μm, and depositing it on a recording sheet.
When the recording paper on which the recording image is formed is charged due to friction or the like somewhere in the paper feed path, the ink discharged from the nozzle is affected by the electric field between the recording paper and the nozzle at the time of recording image formation. In response to this, mist is generated and the characters become dirty, or the nozzles adhere to the nozzle surface and bend, causing problems such as nozzle down.
The ejection instability due to the electric field of the ink ejected from the nozzles has been a big problem particularly when the recording paper is transported while being held on a transport belt or the like by electrostatic force.
As a method for weakening the electric field that causes such a problem, for example, it is known to remove a charge on a recording sheet by bringing a conductive material into contact with the surface of the recording sheet (Patent Document). 1 and Patent Document 2).
However, this method has a problem that the effect of static elimination is reduced due to the contact type, which causes jamming of recording paper and further, paper dust accumulates on the contact portion.
In addition, as a solution for an ink jet recording apparatus in which recording paper is adsorbed to a conveying belt by an electrostatic force and conveyed, an electrode is provided around the ink discharge port and a voltage is applied to the electrode at the timing of discharging the ink. It is also known to control the electric field (see Patent Document 3).
However, according to this method, the head structure is complicated, it is difficult to manufacture, and it is difficult to increase the degree of integration of the nozzles.

Accordingly, an image forming method for forming a recorded image on a recording sheet of a recording medium by ejecting ink, and a copying machine, a facsimile machine, a printer, or a complex machine of these for forming an image by the image forming method. In an image forming apparatus, when a recording sheet of a recording medium for forming a recording image is charged, an ink discharge recording head is generated by an electric field between the recording sheet of the recording medium and a nozzle of the ink discharge recording head at the time of image formation. Ink discharged from the nozzles of the ink is affected, and mist is generated, resulting in character smudges, or attached to the nozzle surface of the ink discharge recording head, bent, and formed by nozzle down of the ink discharge recording head, etc. It is difficult to manufacture because the structure is complicated because it deteriorates the print quality of the recorded image, causes the jam of the recording paper of the recording medium, and deteriorates the static elimination effect. Defect called also difficult and costly to increase the degree of integration of nozzles of the ink jet recording head has occurred.
JP 2001-199585 A Japanese Patent Laid-Open No. 10-81008 JP 2000-25249 A

  The object of the present invention is to solve such problems. In other words, a simple method prevents the occurrence of ink mist due to a charging electric field, the accompanying jet bending, the nozzle down of the ink discharge recording head, and the like, and also provides excellent transportability of the recording medium and produces a high-quality recorded image. An object of the present invention is to provide an image forming method that is formed, has a simple structure, is easy to manufacture, has a high degree of integration of nozzles of an ink discharge recording head, and is low in cost, and an image forming apparatus that forms an image using the image forming method. To do.

In order to achieve the above object, the present invention described in claim 1 is an image forming method for forming a recorded image on a recording medium by ejecting ink. The main feature is that the image forming method is to form a recorded image by ejecting ink onto a recording medium after the reduction.
Alternatively, the present invention described in claim 2 is characterized in that, in the image forming method according to claim 1, the recording medium is formed by holding and transporting a recording medium with an electrostatic force to form a recorded image. And
Alternatively, according to a third aspect of the present invention, in the image forming method according to the first or second aspect, the charge amount in the vicinity of a recorded image formed by ejecting ink onto a recording medium to be conveyed is partially set. The main feature is that the image forming method forms a recorded image by ejecting ink onto a recording medium after the reduction.
Alternatively, according to a fourth aspect of the present invention, in the image forming method according to the first, second, or third aspect, the charge removal amount of the recording medium is partially reduced by attaching a charge eliminating liquid to the recording medium. The main feature is an image forming method for forming a recorded image.
Alternatively, the present invention described in claim 5 is characterized in that, in the image forming method described in claim 4, the charge eliminating liquid is an image forming method for forming a recorded image with a lower viscosity than ink. .
Alternatively, the present invention described in claim 6 is the image forming method according to claim 4 or 5, wherein the charge eliminating liquid is transparent and prevents ink bleeding and forms a recorded image. Is the main feature.
Alternatively, according to a seventh aspect of the present invention, in the image forming method according to the fourth, fifth, or sixth aspect, the charge eliminating liquid has a penetrating property to the recording medium by a penetrating agent to form a recorded image. The main feature is the image forming method.
Alternatively, the present invention according to claim 8 is the image forming method according to claim 4, 5, 6 or 7, wherein the charge removing liquid has a larger droplet than the ink that is ejected onto the recording medium to form a recorded image. The main feature is that it is an image forming method for forming a recorded image by ejecting and adhering to the recording medium.
Alternatively, the present invention according to claim 9 is the image forming method according to claim 4, 5, 6, 7 or 8, wherein the ink is ejected onto the recording medium from the recording medium rather than the ink for forming the recording image. The main feature is an image forming method for forming a recorded image by discharging a charge-removing solution away from the discharge medium and attaching it to a recording medium.

Alternatively, the present invention according to claim 10 is the image forming method according to claim 4, 5, 6, 7, 8 or 9, wherein the charge eliminating liquid is generated by image data formed by ejecting ink onto a recording medium. The main feature is that it is an image forming method for forming a recorded image by ejecting a liquid.
Alternatively, the present invention described in claim 11 is an image forming method according to claim 4, 5, 6, 7, 8, 9 or 10, wherein a discharge image is discharged according to temperature to form a recorded image. The main feature is the formation method.
Alternatively, according to the present invention described in claim 12, in the image forming method according to claim 4, 5, 6, 7, 8, 9, 10, or 11, a recording image is formed by discharging a charge-removing solution according to humidity. The main feature is the image forming method.
Alternatively, according to a thirteenth aspect of the present invention, in the image forming method according to the fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh or twelfth aspect, the neutralizing liquid is applied depending on the surface potential of the recording medium. The main feature is an image forming method for forming a recorded image by discharging.
Alternatively, the present invention described in claim 14 is the image forming method according to claim 4, 5, 6, 7, 8, 9, 10, 11, 12 or 13, wherein the recorded image is ejected onto a recording medium. The main feature is an image forming method for forming a recorded image by discharging a discharging liquid from at least two positions with the ink for forming the image on the inner side and adhering it to the recording medium (P).
Alternatively, the present invention described in claim 15 is the image forming method according to claim 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 or 14, wherein the discharge liquid is discharged to cover the object. The main feature is an image forming method for forming a recorded image by adhering to a recording medium in a stripe pattern.
Alternatively, the present invention described in claim 16 is the image forming method according to claim 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 or 14, wherein the discharge liquid is discharged to The main feature is an image forming method for forming a recorded image by adhering to a recording medium in a grid pattern.

Alternatively, the present invention according to claim 17 is the image forming method according to claim 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 or 14, wherein the discharge liquid is discharged to The main feature is an image forming method for forming a recorded image by adhering to a recording medium in a staggered manner.
Alternatively, the present invention according to claim 18 is the image forming method according to any one of claims 4 to 17, wherein the discharging liquid is ejected to adhere to the recording medium with a landing interval of 1 mm or less. An image forming method for forming an image.
Alternatively, in the image forming apparatus for forming a recorded image on a recording medium by ejecting ink, the present invention described in claim 19 includes: a conveying unit that conveys a recording medium that forms a recording image; and the conveying unit. Recording is performed by ejecting ink onto the recording medium after the charge amount is partially reduced by the charge amount partial reduction means for partially reducing the charge amount of the recording medium being conveyed and the charge amount partial reduction means. The main feature is that the image forming apparatus includes an ink discharge recording head for forming an image.
Alternatively, the invention according to claim 20 is characterized in that, in the image forming apparatus according to claim 19, the conveying means is an image forming apparatus that holds the recording medium with electrostatic force.
Alternatively, in the present invention described in item 21, in the image forming apparatus described in item 19 or 20, the charge amount partial reduction unit applies ink to the recording medium conveyed by the conveyance unit by the ink ejection recording head. The main feature is that the image forming apparatus partially reduces the amount of charge in the vicinity of a recorded image formed by ejecting.
Alternatively, according to the present invention described in claim 22, in the image forming apparatus according to claim 19, 20, or 21, the charge amount partial reduction unit attaches the charge eliminating liquid to the recording medium, The main feature is that the image forming apparatus partially reduces the charge amount.
Alternatively, according to a twenty-third aspect of the present invention, in the image forming apparatus according to the twenty-second aspect, the discharge liquid that the charge amount partial reduction unit adheres to the recording medium is ejected by the ink ejection recording head. The main feature is that the image forming apparatus has a lower viscosity than the ink that forms a recorded image by adhering to a medium.

Alternatively, according to the twenty-fourth aspect of the present invention, in the image forming apparatus according to the twenty-third aspect, the viscosity of the static elimination liquid that the charge amount partial reduction unit adheres to the recording medium is 1.0 (cp) to 20 The main feature is that the image forming apparatus is (cp).
Alternatively, according to the present invention described in claim 25, in the image forming apparatus according to claim 22, 23 or 24, the charge eliminating liquid that the charge amount partial reduction means adheres to the recording medium is transparent and oozes ink. The main feature is that the image forming apparatus prevents the above.
Alternatively, in the present invention described in claim 26, in the image forming apparatus described in claim 22, 23, 24 or 25, the charge eliminating liquid that the charge amount partial reduction means adheres to the recording medium comprises a penetrating agent. The main feature is that the image forming apparatus has permeability to a recording medium.
Alternatively, according to the present invention described in claim 27, in the image forming apparatus according to claim 22, 23, 24, 25 or 26, the surface tension of the neutralizing liquid which the charge amount partial reduction means adheres to the recording medium is , 20 (dyne / cm) to 60 (dyne / cm).
Alternatively, in the image forming apparatus according to claim 22, 23, 24, 25, 26, or 27, the charge amount partial reduction unit is configured to record the recording medium by discharging the charge removal liquid. The main feature is that the image forming apparatus is composed of a discharging liquid discharge recording head that partially reduces the charge amount.
Alternatively, according to a twenty-ninth aspect of the present invention, in the image forming apparatus according to the twenty-eighth aspect, the discharging liquid discharge recording head is a nozzle of an ink discharge recording head that forms a recording image by discharging ink onto a recording medium. The main feature is that the image forming apparatus has a nozzle that discharges a neutralizing liquid having a larger inner diameter.
Alternatively, according to a thirty-third aspect of the present invention, in the image forming apparatus according to the twenty-eighth or the twenty-ninth aspect, the discharge liquid ejection recording head ejects ink onto a recording medium to form a recording image. The main feature is that the image forming apparatus is arranged farther away from the recording medium.

Alternatively, the present invention described in claim 31 is the image forming apparatus according to claim 28, 29 or 30, wherein the discharging liquid discharge recording head discharges ink onto a recording medium by the ink discharge recording head. The main feature is that the image forming apparatus discharges the charge-removing liquid based on the image data for forming the.
Alternatively, according to a thirty-second aspect of the present invention, in the image forming apparatus according to the twenty-eighth, twenty-eighth, thirty-third or thirty-first aspect, the discharge liquid discharge recording head discharges the discharge liquid according to the temperature in the apparatus main body. It is a main feature.
Alternatively, according to a thirty-third aspect of the present invention, in the image forming apparatus according to the thirty-second aspect, the discharging liquid discharge recording head discharges the discharging liquid when the temperature in the apparatus main body is 20 (° C.) or less. It is a main feature.
Alternatively, according to a thirty-fourth aspect of the present invention, in the image forming apparatus according to the twenty-eighth, thirty-eight, thirty-third, thirty-two, or thirty-third aspect, the discharging liquid discharge recording head discharges the discharging liquid by the humidity in the apparatus main body. The main feature is that it is an image forming apparatus.
Alternatively, according to a thirty-fifth aspect of the present invention, in the image forming apparatus according to the thirty-fourth aspect, the discharge liquid discharge recording head discharges the discharge liquid when the humidity in the apparatus main body is 50% or less. It is a main feature.
Alternatively, according to a thirty-sixth aspect of the present invention, in the image forming apparatus according to the twenty-eighth, twenty-eighth, thirty-one, thirty-two, thirty-three, thirty-four, or thirty-fifth aspect, the discharge liquid discharge recording head is a recording medium in the main body of the apparatus. The main feature is that the image forming apparatus discharges the charge eliminating liquid by the surface potential of the image forming apparatus.

Alternatively, according to a thirty-seventh aspect of the present invention, in the image forming apparatus according to the thirty-sixth aspect, the discharging liquid discharge recording head has a surface potential of the recording medium in the apparatus main body of 150 (V) or more, and the discharging liquid. The main feature is that the image forming apparatus ejects the ink.
Alternatively, in the present invention described in Item 38, in the image forming apparatus described in Item 28, 29, 30, 31, 32, 33, 34, or 35, the discharging liquid discharge recording head applies ink to the recording medium. The main feature is an image forming apparatus in which at least two ink-jet recording heads that discharge and form a recorded image are arranged inside.
Alternatively, the present invention described in claim 39 is the image forming apparatus according to claim 28, 29, 30, 31, 32, 33, 34, 35, 36, 37 or 38, The main feature is that the image forming apparatus discharges the charge eliminating liquid and adheres it to the recording medium in stripes.
Alternatively, the present invention described in claim 40 is the image forming apparatus according to claim 28, 29, 30, 31, 32, 33, 34, 35, 36, 37 or 38, The main feature is that the image forming apparatus discharges the charge eliminating liquid and adheres the recording medium to the recording medium in a grid pattern.
Alternatively, the present invention described in claim 41 is the image forming apparatus according to claim 28, 29, 30, 31, 32, 33, 34, 35, 36, 37 or 38, The main feature is that the image forming apparatus discharges the charge eliminating liquid and adheres it to the recording medium in a staggered manner.
Alternatively, in the present invention described in claim 42, in the image forming apparatus according to any one of claims 28 to 41, the discharge liquid discharge recording head discharges the discharge liquid and has a landing interval on the recording medium. The main feature is that the image forming apparatus adheres at 1 mm or less.

Since the present invention is configured as described below, according to the first aspect of the present invention, it is possible to prevent the occurrence of ink mist due to a charged electric field, the accompanying jet bending, the nozzle down of the ink discharge recording head, and the like. Thus, it has become possible to provide an image forming method in which the recording medium is excellent in transportability and a high-quality recorded image is formed.
According to the second aspect of the present invention, it is possible to prevent the occurrence of ink mist due to the charged electric field, the accompanying jetting bending, the nozzle down of the ink discharge recording head, and the like, and the recording medium is reliably held by the electrostatic force and conveyed. It is possible to provide an image forming method that is excellent in properties and can form a high-quality recorded image at high speed.
According to the invention of claim 3, the reduction of the charge amount can be saved, the occurrence of ink mist due to the charging electric field, the accompanying jetting bending, the nozzle down of the ink discharge recording head, etc. can be prevented, and the conveying belt. Thus, it is possible to provide an image forming method in which a decrease in the adhesion force between the recording medium and the recording medium is excellent and the recording medium is excellent in transportability, and a high-quality recorded image is formed.
According to the invention of claim 4, by a simple method of adhering the charge eliminating liquid to the recording medium, it is possible to prevent the occurrence of ink mist due to the charging electric field, the accompanying jetting bending, the nozzle down of the ink discharge recording head, etc. In both cases, paper dust, dust accumulation and paper jam that can occur with contact methods such as pressure-eliminating brushes and earth plates are prevented, and the recording medium is excellent in transportability and high-quality recorded images are formed. An image forming method can be provided.
According to the fifth aspect of the present invention, the mist generation of the neutralizing liquid itself is avoided by a simple method of attaching the neutralizing liquid to the recording medium, and the permeability of the neutralizing liquid into the recording medium is improved and the amount is small and wide. It is possible to eliminate static electricity in the range and prevent the occurrence of ink mist due to the charged electric field and the accompanying jet bending and nozzle discharge of the ink ejection recording head, etc. It has also become possible to provide an image forming method in which the accumulation of paper dust, dust and paper jam is prevented, the transportability of the recording medium is excellent, and a high-quality recorded image is formed.

According to the invention of claim 6, with a simple method of attaching the charge eliminating liquid to the recording medium, it is possible to prevent the occurrence of ink mist due to the charging electric field, the accompanying jet bending, the nozzle down of the ink discharge recording head, etc. Both prevent the occurrence of paper dust, dust accumulation and paper jam that can occur with contact methods such as pressure-eliminating brushes and grounding plates. Excellent transportability of recording media and high-quality recorded images are formed. An image forming method can be provided.
According to the seventh aspect of the present invention, a simple method of attaching a neutralizing liquid that weakens a wide electric field in a small amount to a recording medium can generate ink mist due to a charged electric field, a jet bend accompanying it, and a nozzle down of an ink discharge recording head. In addition to preventing the occurrence of paper dust, dust accumulation and paper jam that can occur with contact methods such as pressure-eliminating brushes and grounding plates, it also has excellent transportability of recording media and high quality It is now possible to provide an image forming method for forming a recorded image.
According to the eighth aspect of the present invention, the neutralization range of one drop is stably widened by a simple method of adhering the neutralizing liquid to the recording medium, the generation of ink mist due to the charging electric field, the accompanying ejection bending, and the ink ejection. In addition to preventing the occurrence of nozzle down of the recording head, etc., it also prevents paper dust, dust accumulation and paper jam that can occur in contact methods such as pressure-eliminating brushes and pressure contacts of the earth plate, and transportability of the recording medium In addition, a low-cost image forming method capable of forming a high-quality recorded image can be provided.
According to the ninth aspect of the present invention, it is a simple method to stably apply the static elimination liquid to the recording medium with a weak influence of the electric field. In addition to preventing the occurrence of accumulation and paper jam, it also prevents the occurrence of ink mist due to the charging electric field and the accompanying jet bending and the nozzle down of the ink discharge recording head, etc. An image forming method capable of forming a quality recorded image can be provided.

According to the tenth aspect of the present invention, the ink mist is generated due to the charged electric field, the resulting jet bending, or the nozzle down of the ink discharge recording head by a simple method of preventing the wasteful use of the charge eliminating liquid and adhering it to the recording medium. Prevents the occurrence of paper dust, dust accumulation, and paper jam that can occur with contact types such as pressure-eliminating brushes and grounding plates, without reducing the holding power of the recording medium. It is possible to provide an image forming method that is excellent in transportability and forms a high-quality recorded image.
According to the eleventh aspect of the present invention, it is possible to prevent the occurrence of ink mist due to the charging electric field, the accompanying jet bending, the nozzle down of the ink discharge recording head, and the like by a simple method of attaching the charge eliminating liquid to the recording medium. Both prevent the occurrence of paper dust, dust accumulation and paper jam that can occur with contact methods such as the static elimination brush and earth plate pressure contact, and provide excellent transportability of recording media and are stable regardless of environmental conditions. An image forming method capable of forming a high-quality recorded image can be provided.
According to the twelfth aspect of the present invention, it is possible to prevent the occurrence of ink mist due to a charging electric field, the accompanying jet bending, the nozzle down of the ink discharge recording head, and the like by a simple method of attaching the charge eliminating liquid to the recording medium. Both prevent the occurrence of paper dust, dust accumulation and paper jam that can occur with the contact type such as the static elimination brush or earth plate pressure contact, excellent transportability of the recording medium, and stable regardless of the humidity of the environmental conditions. An image forming method capable of forming a high-quality recorded image can be provided.
According to the thirteenth aspect of the present invention, it is possible to prevent the occurrence of ink mist due to the charging electric field, the accompanying jet bending, the nozzle down of the ink discharge recording head, and the like by a simple method of attaching the charge eliminating liquid to the recording medium. In both cases, paper dust, dust accumulation and paper jam that can occur in contact methods such as pressure-eliminating brushes and earth plates are prevented, recording media are excellent in transportability, and recording media (P) with environmental conditions Thus, it is possible to provide an image forming method capable of forming a stable and high-quality recorded image without depending on the surface potential.

According to the fourteenth aspect of the present invention, in a simple method of attaching a charge eliminating liquid to a recording medium, it is possible to prevent the occurrence of ink mist due to a charging electric field, the accompanying jet bending, the nozzle down of the ink discharge recording head, and the like. In both cases, it prevents paper dust, dust accumulation and paper jam that can occur with contact methods such as pressure-eliminating brushes and grounding plates, etc., and is excellent in transportability of recording media, and forms high-quality recorded images at high speed. An image forming method can be provided.
According to the fifteenth aspect of the present invention, it is a simple method to remove the electric field that causes the trouble on the recording medium and to apply the neutralizing liquid in a stripe shape. In addition to preventing the occurrence of nozzle down of the recording head, etc., it also prevents paper dust, dust accumulation and paper jam that can occur in contact methods such as pressure-eliminating brushes and pressure contacts of the earth plate, and transportability of the recording medium And an image forming method capable of forming a high-quality recorded image can be provided.
According to the sixteenth aspect of the present invention, it is a simple method to remove the electric field that causes the trouble on the recording medium and to apply the neutralizing liquid in a grid pattern. In addition to preventing the occurrence of nozzle down of the recording head, etc., it also prevents paper dust, dust accumulation and paper jam that can occur in contact methods such as pressure-eliminating brushes and pressure contacts of the earth plate, and transportability of the recording medium And an image forming method capable of forming a high-quality recorded image can be provided.
According to the seventeenth aspect of the present invention, it is a simple method to remove the electric field that causes the trouble on the recording medium and to apply the neutralizing liquid in a zigzag manner. In addition to preventing the occurrence of nozzle down of the recording head, etc., it also prevents paper dust, dust accumulation and paper jam that can occur in contact methods such as pressure-eliminating brushes and pressure contacts of the earth plate, and transportability of the recording medium And an image forming method capable of forming a high-quality recorded image can be provided.

According to the eighteenth aspect of the present invention, an electric mist generated by a charging electric field is generated by weakening an electric field formed on a recording medium without affecting the image quality by a simple method of attaching a charge eliminating liquid to the recording medium. In addition to preventing the occurrence of jet bend and the nozzle down of the ink discharge recording head, it also prevents the occurrence of paper dust, dust accumulation and paper jam that can occur in contact type such as pressure-eliminating brush or ground plate pressure contact. Thus, it has become possible to provide an image forming method in which a high-quality recorded image is formed which is excellent in transportability of the recording medium and does not cause color unevenness.
According to the nineteenth aspect of the present invention, it is possible to prevent the occurrence of ink mist due to a charged electric field, the accompanying jet bending, the nozzle down of the ink discharge recording head, and the like, and the recording medium has excellent transportability and high quality recording. An image is formed, and it is possible to provide a low-cost image forming apparatus with a simple structure and a high integration degree of nozzles of an ink discharge recording head.
According to the twentieth aspect of the present invention, it is possible to prevent the occurrence of ink mist due to a charging electric field, the occurrence of jet bending and the nozzle down of the ink discharge recording head, and the like so that the recording medium is reliably held by electrostatic force and conveyed. It is possible to provide a low-cost image forming apparatus that is excellent in performance, forms a high-quality recorded image at high speed, has a simple structure, has a high degree of integration of the nozzles of the ink ejection recording head.
According to the invention of claim 21, the reduction of the charge amount can be saved, and the occurrence of ink mist due to the charging electric field, the accompanying ejection bending, the nozzle down of the ink discharge recording head, etc. can be prevented, and the conveying belt Provides a low-cost image forming apparatus that has excellent transportability of the recording medium, prevents high-quality recording, forms high-quality recorded images, and has a simple structure and high integration of the nozzles of the ink ejection recording head. I can do it now.
According to the invention of claim 22, it is possible to prevent the occurrence of ink mist due to a charging electric field and the accompanying occurrence of jet bending, nozzle down of the ink discharge recording head, etc. Ink with a simple structure that prevents the occurrence of paper dust, dust accumulation and paper jams, has excellent transportability of the recording medium, forms a high-quality recording image, and attaches the charge eliminating liquid to the recording medium. It has become possible to provide a low-cost image forming apparatus with a high degree of integration of the nozzles of the discharge recording head.

According to the twenty-third aspect of the present invention, generation of ink mist due to a charged electric field can be achieved by avoiding the generation of mist in the neutralizing liquid itself, improving the permeability of the neutralizing liquid into the recording medium and performing a wide range of neutralization. In addition to preventing the occurrence of jet bend and the nozzle down of the ink discharge recording head, it also prevents the occurrence of paper dust, dust accumulation and paper jam that can occur in contact type such as pressure-eliminating brush or ground plate pressure contact. In addition, the transportability of the recording medium is excellent, a high-quality recording image is formed, the ink discharge recording head has a high degree of integration of the nozzles of the ink discharge recording head, and the cost is low. Can now be provided.
According to the twenty-fourth aspect of the present invention, it is possible to reliably avoid the occurrence of mist in the static elimination liquid itself, to reliably improve the permeability of the static elimination liquid to the recording medium, and to perform static elimination in a wide range with a small amount. Preventing the occurrence of ink mist and the resulting jet bend and nozzle discharge of the ink discharge recording head, etc., as well as paper dust, dust accumulation, Prevents occurrence, excellent transportability of the recording medium, forms a high-quality recorded image, and has a simple structure in which the charge removal liquid adheres to the recording medium. An image forming apparatus can be provided.
According to the invention of claim 25, it is possible to prevent the occurrence of ink mist due to a charging electric field and the accompanying occurrence of jet bending, nozzle down of the ink discharge recording head, etc. Prevents the occurrence of possible paper dust, dust accumulation and paper jam, provides excellent transportability of the recording medium, forms a high-quality recorded image, and attaches the static elimination liquid to the recording medium Therefore, it is possible to provide a low-cost image forming apparatus with a high degree of integration of the nozzles of the ink discharge recording head.

According to the twenty-sixth aspect of the present invention, it is possible to prevent the occurrence of ink mist due to a charged electric field and the accompanying occurrence of jet bending, nozzle down of the ink discharge recording head, etc. Prevents the occurrence of paper dust, dust accumulation and paper jams, provides excellent transportability of the recording medium, forms a high-quality recorded image, and uses a small amount of neutralizing liquid to weaken the electric field over a small amount. It is possible to provide a low-cost image forming apparatus with a simple structure to be attached and a high integration degree of nozzles of the ink discharge recording head.
According to the twenty-seventh aspect of the present invention, it is possible to prevent the occurrence of ink mist due to a charging electric field and the accompanying occurrence of jet bending, nozzle down of the ink discharge recording head, etc. Prevents the occurrence of paper dust, dust accumulation and paper jam, prevents the recording medium from being transported, forms a high-quality recording image, and records a neutralizing liquid that reliably weakens a wide range of electric fields with a small amount. It has become possible to provide a low-cost image forming apparatus with a simple structure that adheres to a medium and a high degree of integration of nozzles of an ink discharge recording head.
According to the twenty-eighth aspect of the present invention, it is possible to prevent the occurrence of ink mist due to a charged electric field and the accompanying occurrence of jet bending, nozzle down of the ink discharge recording head, etc. Prevents the occurrence of paper dust, dust accumulation and paper jams, improves the transportability of the recording medium, forms a high-quality recorded image, and removes the discharging liquid on the recording medium by the discharging head. With this simple structure, it is possible to provide a low-cost image forming apparatus with a high degree of integration of the nozzles of the ink discharge recording head.
According to the invention of claim 29, the static elimination range of one drop is stably widened to prevent the occurrence of ink mist due to a charging electric field, the accompanying jet bending, the nozzle down of the ink discharge recording head, etc. Prevents the occurrence of paper dust, dust accumulation and paper jam that can occur in contact types such as pressure-eliminating brushes and pressure contacts of earth plates. With a simple structure in which the discharge liquid is attached to the recording medium with an easy discharge liquid discharge recording head, the nozzles of the ink discharge recording head are highly integrated, and a low-cost image forming apparatus can be provided. It was.

According to the invention of claim 30, it is possible to prevent the occurrence of ink mist due to a charging electric field and the accompanying occurrence of jet bending, nozzle down of the ink discharge recording head, etc. Prevents the occurrence of paper dust, dust accumulation and paper jams, and provides excellent transportability of the recording medium, forming a high-quality recorded image. The discharging liquid discharge recording head applies the discharging liquid to the recording medium. Thus, it is possible to provide a low-cost image forming apparatus with a simple structure that is weakly affected by the influence of the above and has a high integration degree of nozzles of the ink discharge recording head.
According to the invention of claim 31, it is possible to prevent the occurrence of ink mist due to a charging electric field and the accompanying occurrence of jet bending, nozzle down of the ink discharge recording head, etc. Prevents the occurrence of paper dust, dust accumulation and paper jams, and improves the transportability without reducing the holding power of the recording medium, and forms a high-quality recorded image. It has become possible to provide a low-cost image forming apparatus with a simple structure in which the liquid is prevented from being wasted and attached to the recording medium with a high degree of integration of the nozzles of the ink discharge recording head.
According to the invention of claim 32, it is possible to prevent the occurrence of ink mist due to a charging electric field and the accompanying occurrence of jet bending, nozzle down of the ink discharge recording head, etc. Prevents the occurrence of paper dust, dust accumulation and paper jams, provides excellent transportability of the recording medium, forms stable high-quality recording images regardless of the temperature of the environmental conditions, and discharges liquid discharge recording head As a result, it is possible to provide a low-cost image forming apparatus with a simple structure in which the charge-removing liquid is attached to the recording medium, with a high degree of integration of the nozzles of the ink discharge recording head.

According to the thirty-third aspect of the present invention, it is possible to prevent the occurrence of ink mist due to a charging electric field and the accompanying occurrence of jet bending, nozzle down of the ink discharge recording head, and the like. Prevents the occurrence of paper dust, dust accumulation and paper jams, provides excellent transportability of the recording medium, forms a stable and high-quality recorded image regardless of the temperature of the environmental conditions, and discharges the discharging liquid. It has become possible to provide an image forming apparatus with a simple structure in which the discharging liquid is attached to the recording medium by the recording head, the nozzles of the ink ejection recording head are highly integrated, and low in cost.
According to the invention of claim 34, it is possible to prevent the occurrence of ink mist due to the charging electric field and the accompanying occurrence of jet bending, nozzle down of the ink discharge recording head, etc. Prevents the occurrence of paper dust, dust accumulation and paper jams, has excellent transportability of recording media, forms stable high-quality recording images regardless of the humidity of environmental conditions, and discharges liquid discharge recording head As a result, it is possible to provide a low-cost image forming apparatus with a simple structure in which the charge-removing liquid is attached to the recording medium, with a high degree of integration of the nozzles of the ink discharge recording head.
According to the invention of claim 35, it is possible to prevent the occurrence of ink mist due to the charging electric field and the accompanying occurrence of jet bending, nozzle down of the ink discharge recording head, etc. Prevents the occurrence of paper dust, dust accumulation and paper jams, provides excellent transportability of recording media, ensures stable and high-quality recorded images regardless of the humidity of the environmental conditions, and discharges static electricity. It has become possible to provide an image forming apparatus with a simple structure in which the discharging liquid is attached to the recording medium by the recording head, the nozzles of the ink ejection recording head are highly integrated, and low in cost.
According to the thirty-sixth aspect of the present invention, it is possible to prevent the occurrence of ink mist due to a charging electric field and the accompanying occurrence of jet bending, nozzle down of the ink discharge recording head, etc. Prevents the occurrence of paper dust, dust accumulation and paper jams, and provides excellent transportability of the recording medium, forming a stable and high-quality recorded image regardless of the surface potential of the recording medium under environmental conditions, It has become possible to provide an image forming apparatus with a simple structure in which a discharging liquid is attached to a recording medium by a discharging liquid discharge recording head, with a high degree of integration of nozzles of the ink discharging recording head, and at a low cost.
According to the invention of claim 37, it is possible to prevent the occurrence of ink mist due to the charging electric field and the accompanying occurrence of jet bending, nozzle down of the ink discharge recording head, etc. Prevents the occurrence of paper dust, dust accumulation and paper jams, provides excellent transportability of the recording medium, and ensures stable and high-quality recorded images regardless of the surface potential of the recording medium under environmental conditions As a result, it has become possible to provide an image forming apparatus with a simple structure in which the discharging liquid is attached to the recording medium by the discharging liquid discharge recording head, the nozzles of the ink discharging recording head are highly integrated, and the cost is low.

According to the invention of claim 38, it is possible to prevent the occurrence of ink mist due to a charging electric field and the accompanying occurrence of jet bending, nozzle down of the ink discharge recording head, etc. Prevents the occurrence of possible paper dust, dust accumulation and paper jams, provides excellent transportability of the recording medium, forms high-quality recorded images at high speed, and discharges the discharging liquid with the discharging liquid discharge recording head. It is possible to provide a low-cost image forming apparatus with a simple structure that adheres to the nozzle and has a high degree of integration of the nozzles of the ink discharge recording head.
According to the invention of claim 39, it is possible to prevent the occurrence of ink mist due to the charging electric field and the accompanying occurrence of jet bending, nozzle down of the ink discharge recording head, etc. Prevents the occurrence of paper dust, dust accumulation and paper jams, and provides excellent transportability of the recording medium, forming a high-quality recorded image, and discharging the discharging liquid to the recording medium by the discharging liquid discharge recording head. It is possible to provide a low-cost image forming apparatus with a simple structure in which the electric field for generating the ink is removed and attached in a stripe pattern with a high degree of integration of the nozzles of the ink discharge recording head.
According to the invention of claim 40, it is possible to prevent the occurrence of ink mist due to the charging electric field and the accompanying occurrence of jet bending, nozzle down of the ink discharge recording head, etc. Prevents the occurrence of paper dust, dust accumulation and paper jams, and provides excellent transportability of the recording medium, forming a high-quality recorded image, and discharging the discharging liquid to the recording medium by the discharging liquid discharge recording head. It is possible to provide a low-cost image forming apparatus with a simple structure in which the electric field for generating the ink is removed and adhered in a grid pattern with a high degree of integration of the nozzles of the ink discharge recording head.
According to the invention of claim 41, it is possible to prevent the occurrence of ink mist due to the charging electric field and the accompanying occurrence of jet bending, nozzle down of the ink discharge recording head, etc. Prevents the occurrence of paper dust, dust accumulation and paper jams, and provides excellent transportability of the recording medium, forming a high-quality recorded image, and discharging the discharging liquid to the recording medium by the discharging liquid discharge recording head. It is possible to provide a low-cost image forming apparatus with a simple structure in which the electric field for generating the ink is removed and attached in a zigzag pattern with a high degree of integration of the nozzles of the ink discharge recording head.
According to the invention of claim 42, the electric field formed on the recording medium is weakened without affecting the image quality, the generation of ink mist due to the charging electric field, the accompanying ejection bending, the nozzle down of the ink discharge recording head, etc. In addition to preventing the occurrence of paper dust, dust accumulation and paper jam that can occur with contact types such as pressure-eliminating brushes and earth plate pressure contact, etc., it also provides excellent transportability of recording media and uneven color. Provided is a low-cost image forming apparatus in which a high-quality recording image that does not occur is formed, the discharge liquid discharge recording head has a simple structure in which the discharge liquid is attached to the recording medium, the nozzles of the ink discharge recording head are highly integrated, and I was able to do it.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a configuration diagram of a main part of an image forming apparatus, and FIG. 2 is an explanatory diagram of a configuration of a conveyance belt. An image forming apparatus 0 that forms a recorded image on a recording medium by ejecting ink is a target for forming a recorded image. Static elimination of the charge amount partial reduction means 2 for partially reducing the charge amount of the conveyance belt 1a of the conveyance means 1 for conveying the recording paper of the recording medium (P) and the recording medium (P) conveyed by the conveyance belt 1a. The liquid discharge recording head 2a and the ink discharge recording head 3 which forms a recording image by discharging the ink (I) onto the recording medium (P) after the charge amount is partially reduced by the discharging liquid discharge recording head 2a. After the charge amount of the recording medium (P) conveyed by the conveying belt 1a is partially reduced by the discharging liquid discharge recording head 2a, the ink (I) is applied to the recording medium (P) by the ink discharge recording head 3. Form a recorded image by discharging In addition, the simple method of attaching the charge eliminating liquid (J) to the recording medium (P) prevents the occurrence of ink mist due to the charging electric field, the accompanying jet bending, and the nozzle 3a of the ink discharge recording head 3 being down. In addition, it prevents paper dust, dust accumulation, and paper jam that can occur with contact types such as a static elimination brush or pressure contact with a grounding plate, has excellent transportability, and forms a high-quality recorded image with a simple structure. Therefore, the integration degree of the nozzle 3a is high and the cost is low.
The paper feeding device 4 in the image forming apparatus 0 has a paper feeding roller 4a for feeding the recording medium (P) and a separation pad 4b for separating the recording medium (P) one by one. The recording medium (P) is stacked and held on the sheet stacking unit 4c.
When the transport belt 1a transports the recording medium (P), a charge is formed by the charging roller 1d on the transport belt 1a stretched by the belt transport roller 1b and the tension roller 1c, and the recording medium (P) However, the sheet is securely held in a state where it is stuck to the conveying belt 1a by the adsorption force due to the electrostatic force, and is conveyed.

As shown in FIG. 2, the conveyor belt 1a is a two-layer structure of the surface layer 1a ₁ and the back layer 1a _2, the surface layer 1a ₁ is a high-resistance layer made of a resin material, the backing layer 1a ₂ is an intermediate resistance layer in which the resistance control by carbon is performed on the resin material.
Charging roller 1d is medium resistance layer 1d ₂ is formed on the outer layer of the metal roller 1d _1, is formed with a thin high-resistance layer 1d ₃ in the outermost layer, a high-resistance layer formed of a resin material of the conveyor belt 1a made are arranged in contact with the outer layer 1a _1.
Further, the belt conveying roller 1b is also functions as a ground roller, it is disposed in contact with the back layer 1a ₂ of the conveyor belt 1a.
By applying a high voltage to the charging roller 1d, a discharge is generated in the air gap near the nip portion between the conveying belt 1a and the charging roller 1d, and charges are deposited on the conveying belt 1a.
When the voltage applied to the charging roller 1d is a positive and negative AC voltage, positive and negative charges are alternately attached in a stripe pattern on the conveyor belt 1a as shown in FIG.
When the recording medium (P) is supplied to the transport belt 1a thus charged, an electric field of electric lines of force is formed as shown in FIG.
The recording medium (P) is attracted to the transport belt 1a by this electrostatic force.
Since printing can be performed while the recording medium (P) is firmly held on the conveyor belt 1a, a recorded image can be formed, and printing is performed while recording the recording medium (P) at high speed. Even when an image is formed, stable printing is performed and a high-quality recorded image is formed.
In FIG. 3, the ink discharge recording head 3 in the image forming apparatus 0 includes a nozzle 3a, a substrate 3b, a piezoelectric vibrator 3c that is an electromechanical transducer, a frame 3d that supports an ink liquid chamber, a vibration plate 3e, an ink liquid chamber, The ink common liquid chamber 3f, which is a flow path, a fluid resistance portion 3g, an ink pressurizing chamber 3h, and the like.
The above diaphragm 3e has an elastically deformable diaphragm diaphragm 3e ₁ to the ink pressurizing chamber 3h side, contraction of the ink pressurizing chamber 3h by the expansion and contraction of the piezoelectric vibrator 3c, and is adapted to expand.
When the drive signal is applied to the piezoelectric vibrator 3c and charged, the piezoelectric vibrator 3c expands in the direction of the arrow (A) shown in the figure. When the charge charged in the piezoelectric vibrator 3c is discharged, the direction of the arrow (A) shown in the figure shows. It contracts in the opposite direction.
By applying an appropriate voltage signal to the piezoelectric vibrator 3c, the ink (I) pressurized by the volume change of the ink pressurizing chamber 3h is ejected from the nozzle 3a to the recording medium (P), and the recorded image is displayed. It can be formed.

4 to FIG. 10, the carriage 5 is provided opposite to the conveyor belt 1a for holding the recording medium (P) adsorbed on the surface layer 1a _1, shown in an arrow in FIG. 1 and FIG. 2 (B) Is held so as to be scanned in the direction indicated by the arrow (C) in the direction perpendicular to the conveyance direction of the conveyance belt 1a, that is, the conveyance direction of the recording medium (P).
As described above, the recording medium (P) is adsorbed to the transport belt 1a by electrostatic force. However, depending on various conditions such as the environment and the surface resistance of the recording medium (P), the charge on the transport belt 1a may be reduced. The ink (I) ejected from the ink ejection recording head 3 is affected by the electric field to be formed, and jetting bending and satellites may occur.
For example, the worst problem is that the generated satellite makes a U-turn and adheres to and accumulates on the front surface of the nozzle 3a of the ink ejection recording head 3 to cause nozzle down.
Even when the recording medium (P) is transported while being sandwiched between the normal roller pair 1e shown in FIG. 5, this problem occurs particularly in the dry environment, especially between the paper feed mechanism parts and the recording medium (P). The surface may be charged at a high potential due to the friction, and this is not a problem specific to the conveyance by the conveyance belt 1a.
The problem of mist generation due to charges on the conveying belt 1a and the recording medium (P) is that the recording medium (P) itself has a large electric resistance due to drying or the like, and the electric field is strong, or the viscosity of the ink (I) is large. When the tails of the flying droplets are long when the ink (I) is ejected from the nozzles 3a of the ink ejection recording head 3, there is a tendency to become worse.
Accordingly, the image forming apparatus 0 that reduces this problem is a discharge liquid discharge recording head 2a that discharges the discharge liquid (J) to both sides of the carriage 5 with the nozzle 3a of the ink discharge recording head 3 that forms a recording image interposed therebetween. mounted, before performing printing by ejecting ink (I) from the nozzle 3a of the ink discharge recording head 3, the recording medium static liquid (J) from the nozzle 2a ₁ of the static liquid discharge recording head 2a ( P) is discharged, and the electric resistance of the recording medium (P) is lowered to effectively weaken the electric field.

Ejected from the nozzles 2a ₁ of the static liquid discharge recording heads 2a to the recording medium (P), anti-static liquid to weaken enable field to lower the electric resistance of the recording medium (P) (J) is a transparent In addition to preventing ink bleeding and having the property of forming a high-quality recorded image, both have low viscosity and high penetration by the penetrant to the recording medium (P).
The neutralizing liquid (J), which is discharged from the nozzle 2a ₁ onto the recording medium (P) and lowers the electric resistance of the recording medium (P) to effectively weaken the electric field, has a low viscosity. ) Is prevented from generating mist of the charge removal liquid (J).
Further, the neutralizing liquid (J) which is discharged from the nozzle 2a ₁ to the recording medium (P) and effectively lowers the electric field by lowering the electric resistance of the recording medium (P) can be obtained in a small amount by making it highly permeable. The electric field in a wide range is surely weakened.
As the penetrant of the neutralizing liquid (J) which is discharged from the nozzle 2a ₁ to the recording medium (P) and lowers the electric resistance of the recording medium (P) to effectively weaken the electric field, the following formulas (I) to (I) Those represented by (IV) are preferred.

但し、Ｒは分岐していても良い炭素数６〜１４の炭化水素鎖、ｋは５〜２０の整数である。
Ｒ―（ＯＣＨ₂ＣＨ₂）_nＨ・・・式（II）
但し、Ｒは分岐していても良い炭素数６〜１４の炭化水素鎖である。

但し、ｍ、及び、ｎは、０〜４０の整数である。

但し、Ｒは炭素数６〜１４の炭化水素鎖、ｍ、及び、ｎは整数であって、ｍ、ｎ≦２０、０＜ｍ＋ｎ≦４０である。 Specifically, a polyoxyethylene alkylphenyl ether surfactant of formula (I), a polyoxyethylene alkyl ether surfactant of formula (II), an acetylene glycol surfactant of formula (III), and a formula (IV ) Polyoxyethylene polyoxypropylene alkyl ether-based surfactants can reduce the surface tension of the liquid, so that the wettability can be improved and the penetration rate can be increased.

However, R is a C6-C14 hydrocarbon chain which may be branched, and k is an integer of 5-20.
R- (OCH ₂ CH ₂ ) _n H Formula (II)
However, R is a C6-C14 hydrocarbon chain which may be branched.

However, m and n are integers of 0-40.

However, R is a C6-C14 hydrocarbon chain, m, and n are integers, and m, n ≦ 20, and 0 <m + n ≦ 40.

Other than the compounds of the above formulas (I) to (IV), for example, diethylene glycol monophenyl ether, ethylene glycol monophenyl ether, ethylene glycol monoallyl ether, diethylene glycol monobutyl ether, propylene glycol monobutyl ether, tetraethylene glycol chlorophenyl ether, etc. Polyhydric alcohol alkyls and aryl ethers, nonionic surfactants such as polyoxyethylene polyoxypropylene block copolymers, fluorine-based surfactants, lower alcohols such as ethanol and 2-propanol can be used. In particular, diethylene glycol monobutyl ether is preferred.
The surface tension of the neutralizing liquid (J) discharged from the nozzle 2a ₁ to the recording medium (P) and effectively reducing the electric field by lowering the electric resistance of the recording medium (P) is 20 (dyne / cm) to 60 (Dyne / cm) (20 * 10 ⁻⁵ N / cm to 60 * 10 ⁻⁵ N / cm) is preferable, and is compatible with wettability with the recording medium (P) and droplet formation. Is more preferably 30 (dyne / cm) to 50 (dyne / cm) (30 * 10 ⁻⁵ N / cm to 50 * 10 ⁻⁵ N / cm).
Further, the viscosity of the neutralizing liquid (J) discharged from the nozzle 2a ₁ to the recording medium (P) to effectively reduce electrolysis by lowering the electric resistance of the recording medium (P) is 1.0 (cP) to 20 (cP) (1.0 * 10 ⁻³ Pa · s to 20 * 10 ⁻³ Pa · s) is preferable, and it is possible to reliably avoid the occurrence of mist in the static elimination liquid (J) itself, J) can be reliably penetrated into the recording medium (P), and can be discharged in a wide range with a small amount. From the viewpoint of ejection stability, 3.0 (cP) to 10 (cP) (3 0.0 * 10 ⁻³ Pa · s to 10 * 10 ⁻³ Pa · s) is more preferable.

The neutralizing liquid (J) that is discharged from the nozzle 2a ₁ to the recording medium (P) to lower the electrical resistance of the recording medium (P) and effectively weaken the electrolysis is recorded from the nozzle 3a of the ink ejection recording head 3. Prior to the discharge of the ink (I) for forming the recording image on the medium (P), the discharge is performed under a strong electric field, and the discharge liquid (J) is transparent and does not contribute to the image formation. As a prescription having a lower viscosity than I), the discharge stability can be enhanced.
The neutralizing liquid ejection recording head 2a that ejects the neutralizing liquid (J) to the recording medium (P) may be dedicated for ejecting the neutralizing liquid (J), but recording to the recording medium (P) is possible. The same ink discharge recording head 3 as that discharges ink (I) for forming an image can also be used.
The discharging liquid discharge recording head 2a that discharges the discharging liquid (J) to the recording medium (P) preferably has a characteristic that allows a large discharging liquid droplet (J) to be stably discharged.
Accordingly, forming a recorded image static liquid (J) to the anti-static liquid discharge recording head 2a for ejecting the recording medium (P), the inner diameter of the nozzle 2a ₁ is the recording medium (P) in the image forming apparatus 0 It is configured to be larger than the inner diameter of the nozzle 3a of the ink discharge recording head 3 that discharges the ink (I) to be discharged, and stably discharges large droplets of the neutralizing liquid (J).

In addition, the discharging liquid (J) discharged from the discharging liquid discharge recording head 2a onto the recording medium (P) is the ink discharging recording head before the ink discharging recording head 3 forms a recording image on the recording medium (P). 3 and the recording medium (P) are discharged in order to weaken the electrolysis, and it is not necessary to discharge the recording medium (P) over the entire surface of the recording medium (P). What is necessary is just to discharge to a recording medium (P).
Accordingly, the discharging liquid discharge recording head 2a that discharges the discharging liquid (J) to the recording medium (P) in the image forming apparatus 0 discharges the ink (I) that forms the recording image on the recording medium (P). The nozzle resolution is lower than that of the ink discharge recording head 3, and it is easy to manufacture with a relatively simple structure, and further, a low-cost structure can be achieved.
The discharge liquid discharge recording head 2a that discharges the discharge liquid (J) to the recording medium (P) includes the ink discharge recording head 3 that discharges the ink (I) that forms the recording image on the recording medium (P). Unlikely, since the landing position accuracy of the discharged static elimination liquid (J) is not required, the gap between the positions of the recording medium (P) surface and the static elimination liquid ejection recording head 2a is larger than that of the ink ejection recording head 3. Can be bigger.
Accordingly, the discharging liquid discharge recording head 2a that discharges the discharging liquid (J) to the recording medium (P) in the image forming apparatus 0 is the distance between the positions of the recording medium (P) and the discharging liquid discharge recording head 2a. Can be made less susceptible to the influence of the electric field on the recording medium (P), the conveyor belt 1a, and the like.

Further, as described above, the discharge of the discharge liquid (J) from the discharge liquid discharge recording head 2a to the recording medium (P) is an ink that forms a recording image from the ink discharge recording head 3 to the recording medium (P). Since the purpose is to weaken the electric field during the ejection of (I), the recording image formed by ejecting the ink (I) by the ink ejection recording head 3 onto the recording medium (P) transported by the transport belt 1a. The charge amount only in the vicinity of the recording image formed by discharging the neutralizing liquid (J) only in the vicinity and discharging the ink (I) by the ink discharge recording head 3 may be partially reduced.
For example, in the image forming apparatus 0, when the ink discharge recording head 3 discharges the ink (I) and prints the line (L) of the recording image as shown in FIG. The neutralization liquid (J) is ejected from the neutralization liquid ejection recording head 2a only in the vicinity (M) of the image line (L).
However, the neutralizing liquid (J) is not ejected from the neutralizing liquid ejection recording head 2a to a portion where there is no recorded image where the ink (I) is not ejected by the ink ejection recording head 3.
Further, in the image forming apparatus 0, even when the ink (I) is ejected by the ink ejection recording head 3 and a solid recording image is printed and formed, the discharging medium ejection recording head 2a is used to record the recording medium ( Without discharging the neutralizing liquid (J) over the entire surface of P), as shown by the shaded area shown in FIG. 7, FIG. 8, or FIG. 9, the stripe shape (X), the lattice shape (Y), or The electric field can be weakened by discharging the neutralizing liquid (J) partially such as in a zigzag pattern (Z).
Therefore, in the image forming apparatus 0, the image data of the recording image formed by discharging the ink (I) by the ink discharge recording head 3 onto the recording medium (P) transported by the transport belt 1a as described above. By controlling the discharge amount of the discharging liquid (J) from the discharging liquid discharge recording head 2a to the recording medium (P) based on the above, the discharging is limited only to the area that affects the occurrence of mist. The wasteful consumption of the liquid (J) can be eliminated, and the cost has been reduced.

The image forming apparatus 0 includes a humidity detection sensor 6 for detecting humidity in the apparatus main body 0a.
For example, the humidity detection by the humidity detection sensor 6 prevents the discharge liquid (J) from being discharged under a high humidity environment under a condition where the charge amount on the recording medium (P) or the transport belt 1a is small. It is possible and effective.
Further, the image forming apparatus 0 has a temperature detection sensor 7 for detecting temperature mounted on the apparatus main body 0a.
For example, when the temperature of the temperature detection sensor 7 is detected, the neutralization liquid (J) is removed only when the viscosity of the ink (I) ejected from the ink ejection recording head 3 increases and mist is likely to occur in a low temperature environment. It is effective to be able to discharge.
The image forming apparatus 0 has a surface potential detection sensor 8 for detecting the surface potential of the recording medium (P) and the conveyor belt 1a mounted on the apparatus body 0a.
For example, the surface potential detection of the surface potential detection sensor 8 is effective because the discharge liquid (J) can be discharged only when the electric field is large and mist is likely to be generated.
The discharging liquid discharge recording head 2a that discharges the discharging liquid (J) to the recording medium (P) conveyed by the conveying belt 1a has the ink (I) applied to the recording medium (P) as shown in FIG. The two ink ejection recording heads 3 that form a recording image by ejecting the ink are arranged on both sides of the inner side. However, as shown in FIG. It is possible to print.
However, two ink ejection recording heads 3 that eject ink (I) to the recording medium (P) to form a recording image are arranged on both sides of the recording medium (P) so that both directions can be obtained while discharging. Since printing can be performed, it is more effective in that image formation can be performed at high speed.

In FIG. 3, in the ink discharge recording head 3, the piezoelectric vibrator 3c is bonded and fixed to the upper surface of the substrate 3b made of ceramic having a thickness of 2 mm and an electrode pattern formed on the surface with an anaerobic adhesive. ing.
The piezoelectric vibrator 3c has a laminated structure in which internal electrodes on the GND side and the Hot side are alternately arranged, and each internal electrode is connected to external electrodes formed on two different insulated surfaces. .
By applying a voltage between the two external electrodes, displacement occurs in the piezoelectric vibrator 3c.
The ink discharge recording head 3 in the image forming apparatus 0 obtains the discharge pressure of the ink (I) using the displacement in the thickness direction of the piezoelectric vibrator 3c.
A conductive paste is applied and cured at the boundary between the hot-side external electrode and the substrate 3b, and the external electrode of the piezoelectric vibrator 3c and the electrode pattern of the substrate 3b are made conductive.
Next, after dividing the electrode patterns of the piezoelectric vibrator 3c and the substrate 3b by a dicing saw with a pitch of about 85 μm, the GND side electrode of the substrate 3b is short-circuited with a conductive paste. .
Thereafter, the frame 3d made of glass-reinforced epoxy resin is bonded to the substrate 3b with epoxy resin, and finally, the piezoelectric vibrator 3c and the upper surface of the frame 3d are made to be the same surface by surface grinding, and then bonded with epoxy. An agent is applied to the upper surface of the frame 3d and the piezoelectric vibrator 3c by screen printing, and the liquid chamber unit 3i is positioned and bonded with high accuracy.
The liquid chamber unit 3i includes a nozzle plate 3a ₁ manufactured by electroforming a flow path plate in which the ink common liquid chamber 3f, the fluid resistance portion 3g, the ink pressure chamber 3h, and the like are formed by etching a Si substrate. It is a structure in which the diaphragms 3e are sandwiched and the respective interfaces are joined with an epoxy adhesive.
An ink cartridge is connected to the liquid chamber unit 3i via an ink supply tube (not shown) to supply ink (I).
In the image forming apparatus 0, the ink discharge recording head 3 having such a configuration is mounted on the carriage 5 as shown in FIG. 10, and a printing unit having a five-head configuration is formed.

The image forming apparatus 00 shown in FIG. 5 is a configuration diagram when the carriage 5 is mounted and viewed from the lateral direction with respect to the conveyance direction of the recording medium (P) in the direction indicated by the arrow (B). is there.
The recording medium (P) is picked up one by one from the paper stacking portion 4c by the paper feeding roller 4a and the separation pad 4b of the paper feeding device 4.
Further, the recording medium (P) is fed under the ink discharge recording head 3 while being fed along the conveyance guide 1f and is sandwiched by the nip portion of the upper and lower two roller pairs 1g and sandwiched by the roller pair 1g. Is sent to form a recorded image.
A rubber material is used for the surface layer of various rollers used in the paper feeding device 4 in order to obtain a frictional force.
In the image forming apparatus 00, the ink (I) that forms a recorded image on the recording medium (P) by discharging from the noise 3a of the ink discharge recording head 3 is a pigment ink having a viscosity of 10 cP at room temperature. The recording medium (P) is made of high-quality paper having a relatively high surface resistance, and is used in a normal temperature environment (23 ° C., 50%), a low temperature low humidity environment (10 ° C., 5%), and a high temperature high humidity environment (32 ° C., 80%). ), The continuous printing evaluation of 500 sheets of the electronic cooperative standard pattern J6 chart was performed.

First, in FIG. 10, the ink (I) is discharged to the recording medium (P) without driving the discharging liquid discharge recording head 2a for discharging the discharging liquid (J) to the recording medium (P). When only four ink ejection recording heads 3 for forming a recording image are driven and evaluated, and the recording image is formed by ejecting ink (I) onto the recording medium (P) in a low temperature and low humidity environment. Nozzle down occurred.
Therefore, as a result of analyzing the cause of the nozzle down, it was observed that ink mist was accumulated on the nozzle portion of the nozzle surface of the nozzle 3a of the ink discharge recording head 3.
Next, the neutralization liquid discharge recording head 2a that discharges the neutralization liquid (J) to the recording medium (P) was filled with the neutralization liquid (J), and the same print evaluation was performed in a low temperature and low humidity environment.
The recording image is formed by ejecting ink (I) onto the recording medium (P) only when the carriage 5 shown in FIG. 10 scans in the direction of the arrow (D) shown in FIG. When scanning in the direction opposite to the arrow (D) direction, the ink (I) was ejected onto the recording medium (P), and the recording image was not formed.
The neutralizing liquid (J) ejected from the neutralizing liquid discharge recording head 2a onto the recording medium (P) was adjusted to have a viscosity of 7 cP at room temperature using the following formulation.
That is, the formulation of the static elimination liquid (J) is 10.0 parts for glycerin, 1.0 part for octanediol, 2.0 parts for cationic surfactant, 1.0 part for benzotriazole, PROXEL LV (S). Is 0.2 parts and water is the remaining amount.
The neutralizing liquid (J) ejected from the neutralizing liquid ejection recording head 2a to the recording medium (P) drives the ink ejection recording head 3 that ejects ink (I) to the recording medium (P) to form a recording image. Prior to the recording, the ink is discharged intermittently, and is discharged onto the recording medium (P) in the stripe shape (X) shown in FIG.
The width of the stripe (X) stripe was 0.6 mm for each of the ejection part and the non-ejection part.

According to the method for ejecting ink (I) to the recording medium (P) as described above to form a recorded image, the electronic cooperative standard pattern J6 chart is continuously printed on the recording medium (P) by 500 ink JI charts. Was ejected to form a recorded image. No nozzle down occurred even in a low temperature and low humidity environment.
Further, when the nozzle surface observation evaluation of the nozzle 3a of the ink discharge recording head 3 was performed, a small amount of ink mist adhered to the nozzle surface of the nozzle 3a of the ink discharge recording head 3, but the ink discharge recording head 3 This was a good result because it was not deposited near the nozzle 3a.
The neutralizing liquid (J) ejected from the recording head 2a to the recording medium (P) is the recording medium (P) in the lattice shape (Y) shown in FIG. 8 or the zigzag shape (Z) shown in FIG. As a result of the same evaluation, good results were obtained.
When the nozzle down evaluation was performed under the condition where the neutralization was not performed using the temperature / humidity environment as a parameter, the result was generally as shown in FIG. 11 although there was some variation.
Therefore, in the image forming apparatus 0, the humidity detection sensor 6 and the temperature detection sensor 7 detect the humidity and detect the temperature, and the recording medium (P) only under the condition indicated by (x) in FIG. When the discharging liquid (J) is discharged from the discharging liquid discharge recording head 2a, a stable recording image can be formed without nozzle down in all environments of 5 ° C. to 35 ° C. and 5% to 80%. Certainly done.

Next, another embodiment of the present invention shown in FIGS. 1 and 4 in the image forming apparatus 0 will be described.
As shown in FIG. 4, the image forming apparatus 0 has the same configuration as in the above-described embodiment, and forms four recorded images by ejecting ink (I) onto the recording medium (P). The ink discharge recording head 3 is mounted on the carriage 5, and the discharging liquid (J) is discharged to the recording medium (P) transported by the transport belt 1a at both ends of the four ink discharge recording heads 3. Two discharging liquid discharge recording heads 2a are mounted.
The neutralizing liquid ejection recording head 2a that ejects the neutralizing liquid (J) to the recording medium (P) conveyed by the conveying belt 1a has the configuration and construction method of ejecting the ink (I) to the recording medium (P). This is substantially the same as the ink discharge recording head 3 for forming a recording image, but has the nozzle 2a ₁ having an inner diameter of 27 μm which is slightly larger than the inner diameter of the nozzle 3a of the ink discharge recording head 3. Yes.
In addition, while the pitch between the nozzles 3a of the ink ejection recording head 3 for ejecting the ink (I) to the recording medium (P) to form a recording image is about 170 μm, the recording medium (conveyed by the conveying belt 1a) The pitch between the nozzles 2a ₁ for discharging the charge removal liquid (J) to P) is 340 μm.
By doing so, it becomes possible to easily manufacture the discharge liquid discharge recording head 2a that discharges the discharge liquid (J) to the recording medium (P) transported by the transport belt 1a, thereby reducing the cost. It also became.

As shown in FIG. 4, the nozzle 2a ₁ that discharges the discharging liquid (J) to the recording medium (P) conveyed by the conveying belt 1a discharges the ink (I) to the recording medium (P). Thus, the ink ejection recording head 3 for forming a recording image is fixed to the carriage 5 so as to be positioned 1 mm above the nozzle 3a.
As shown in FIG. 1, the transport means 1 for the recording medium (P) uses a transport belt 1a in which carbon is dispersed in EPDM rubber or silicon rubber to make it conductive, and the charging roller 1d. A pulse voltage of ± 2 kV is applied to the charging roller 1d to cause charges to adhere to the surface of the transport belt 1a, and the recording medium (P) is attracted and transported by electrostatic force.
The recording medium (P) is made of high-quality PPC paper, and the same ink (I) as in the above-described embodiment is used. Room temperature environment (23 ° C., 50%), low temperature and low humidity environment (10 ° C., 5%), high temperature In a high-humidity environment (32 ° C., 80%), the electronic cooperative standard pattern J6 chart was evaluated for continuous printing of 500 sheets in the bidirectional printing mode.
First, the recording medium (P) is driven without driving the discharging liquid discharge recording head 2a for discharging the discharging liquid (J) to the recording medium (P) conveyed by the conveying belt 1a shown in FIG. The ink (I) is ejected onto the recording medium to form a recorded image. As a result of driving and evaluating only the four ink ejection recording heads 3, the ink (I) is applied to the recording medium (P) in a low temperature and low humidity environment. When a recording image was formed by discharging, nozzle down occurred.
Therefore, as a result of analyzing the cause of the nozzle down, the reason for the down is that ink mist is accumulated on the nozzle portion of the nozzle surface of the nozzle 3a of the ink discharge recording head 3 as in the case of the above-described embodiment. Observed and confirmed.
Next, as in the case of the above-described embodiment, the discharging liquid discharge recording head 2a for discharging the discharging liquid (J) to the recording medium (P) transported by the transport belt 1a is filled in the same manner as in the above-described embodiment. Before discharging the ink (I), the print evaluation was performed such that the charge eliminating liquid (J) was discharged onto the recording medium (P) in a stripe shape (X) as shown in FIG.
The width of the stripe (X) was 0.6 mm for each of the ejection part and the non-ejection part.

According to the method for ejecting ink (I) to the recording medium (P) as described above to form a recorded image, the electronic cooperative standard pattern J6 chart is continuously printed on the recording medium (P) by 500 ink JI charts. When a recording image was formed by discharging the recording medium, it was possible to form a recording image on the recording medium (P) at high speed by bidirectional printing without causing nozzle down even in a low temperature and low humidity environment.
In addition, when the nozzle surface observation evaluation of the nozzle 3a was performed, a small amount of ink mist adhered to the nozzle surface of the nozzle 3a, but it did not accumulate in the vicinity of the nozzle 3a portion, and the result was good.
In addition, the nozzle surface of the nozzle 2a ₁ that discharges the discharging liquid (J) to the recording medium (P) transported by the transport belt 1a also has a gap between the recording media (P) as compared with the nozzle surface of the nozzle 3a. Due to the effect of increasing the viscosity and the viscosity of the static elimination liquid (J) being small, there was almost no mist adhesion and the result was good.
In this embodiment, the pitch between the nozzles 2a ₁ is twice that of the nozzle 3a, but since the inner diameter of the nozzle 2a ₁ is increased, the droplet size of the charge removal liquid (J) can be increased, and the charge removal. Since the liquid (J) was made highly penetrating and the characteristics of spreading greatly after landing on the recording medium (P) were obtained, a sufficient static elimination effect was obtained.

Next, the landing interval width of the discharge portion and non-discharge portion of the discharge pattern of the discharge liquid (J) discharged by the discharge liquid discharge recording head 2a to the recording medium (P) transferred by the transfer belt 1a is set to 0. When the same experiment was performed in a low temperature and low humidity environment, the nozzle down did not occur under the condition of 4 mm or less as shown in FIG. A good image could not be obtained due to color unevenness between the portion where the ink was discharged and the portion where the ink was not discharged, but the image quality was good if the width of the landing interval was 1 mm or less.
The image forming apparatus 0 has the surface main body sensor 0a mounted with the surface potential detection sensor 8 for detecting the surface potential of the recording medium (P) transported by the transport belt 1a.
The relationship between the surface potential of the recording medium (P) conveyed by the conveying belt 1a and the nozzle down was examined by changing the voltage applied to the charging roller 1d in a low temperature and low humidity environment.
As a result, as shown in FIG. 13, the nozzle down did not occur at 150 (V) or less, but the nozzle down occurred at a low frequency at 200 (V) and 300 (V), and 400 (V). In these cases, nozzle down occurred frequently.
Therefore, in the image forming apparatus 0, when the detection potential of the surface potential detection sensor 8 is 150 (V) or higher, the discharging liquid discharge recording head is applied to the recording medium (P) transported by the transport belt 1a. 2a discharges the neutralization liquid (J), and is an electronic cooperative standard in normal temperature environment (23 ° C, 50%), low temperature and low humidity environment (10 ° C, 5%), and high temperature and high humidity environment (32 ° C, 80%). As a result of continuous printing evaluation of the pattern J6 chart, it was possible to surely obtain a stable and high quality recorded image without nozzle down in all environments.

Next, as shown in FIG. 6, using a chart in which patterns of thick vertical strip lines (L) are written on the left and right sides of the recording medium (P), the static elimination liquid (J) in a low temperature and low humidity environment of 5 ° C. and 5%. A continuous printing test was conducted under the condition that no ink was discharged.
As a result, nozzle down occurred after printing about 2,000 sheets.
Therefore, the width of the attachment / detachment interval is 0.9 mm only in the region surrounding about 4 mm outside the line (L) where the ink (I) is ejected by the ink ejection recording head 3 as shown in FIG. Printing was evaluated in the same manner as described above while discharging the neutralizing liquid (J) in a pattern in which squares of the corners were arranged in a staggered pattern, and printing was possible without forming the nozzle down to form a recorded image.
Therefore, in the image forming apparatus 0, the charge removal is performed only in the vicinity of the recording image formed by discharging the ink (I) to the recording medium (P) transported by the transport belt 1a by the ink discharge recording head 3. Since the liquid discharge recording head 2a discharges the static elimination liquid (J), it is possible to save the reduction of the charge amount, and the static elimination liquid (J) can be saved.
In this way, the discharge area of the discharging liquid (J) discharged by the discharging liquid discharge recording head 2a is controlled according to the image data of the recording image formed by discharging the ink (I) by the ink discharging recording head 3. As a result, useless consumption of the static elimination liquid (J) can be prevented.
In particular, when the transport belt 1a is used, it is possible to prevent a decrease in the adhesion between the transport belt 1a and the recording medium (P) due to unnecessary charge removal.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram illustrating an image forming method according to an embodiment of the present invention and an image forming apparatus that forms an image using the image forming method. 1 is an enlarged view illustrating a state of a main part of an image forming method and an image forming apparatus that forms an image by the image forming method according to an embodiment of the present invention. FIG. 5 is an enlarged cross-sectional view illustrating an image forming method showing an embodiment of the present invention and other main parts of an image forming apparatus that forms an image by the image forming method. FIG. 3 is an explanatory diagram for explaining another main part of an image forming method and an image forming apparatus that forms an image by the image forming method according to an embodiment of the present invention. It is explanatory drawing explaining the image forming method which shows the other embodiment of this invention, and the image forming apparatus which forms an image with the image forming method. It is explanatory drawing explaining the state of the principal part of the image forming method which forms the image by the image forming method which shows the other embodiment of this invention, and the image forming method. It is explanatory drawing explaining the state of the principal part of the image forming method which forms the image by the image forming method which shows the other embodiment of this invention, and the image forming method. It is explanatory drawing explaining the state of the principal part of the image forming method which forms the image by the image forming method which shows the other embodiment of this invention, and the image forming method. It is explanatory drawing explaining the state of the principal part of the image forming method which forms the image by the image forming method which shows the other embodiment of this invention, and the image forming method. It is explanatory drawing explaining the principal part of the image forming method which forms the image by the image forming method which shows the other embodiment of this invention, and the image forming method. FIG. 2 is an explanatory diagram illustrating characteristics of temperature (° C.) and humidity (%) in another main part of an image forming method and an image forming apparatus that forms an image by the image forming method according to an embodiment of the present invention. is there. FIG. 2 is an explanatory diagram illustrating an image forming method according to an embodiment of the present invention, and width (mm), nozzle down, and image quality characteristics of other main parts of an image forming apparatus that forms an image by the image forming method. is there. FIG. 6 is an explanatory diagram for explaining the surface potential (V) and nozzle down characteristics in another main part of an image forming method and an image forming apparatus that forms an image by the image forming method according to an embodiment of the present invention. .

Explanation of symbols

0 image forming device,
00 image forming apparatus,
0a Device body 1 Conveying means,
1a Conveyor belt,
1a ₁ surface layer,
1a ₂ back layer,
1b belt conveying roller,
1c tension roller,
1d charging roller,
1d ₁ metal roller,
1d ₂ medium resistance layer,
1d ₃ high resistance layer,
1e Roller pair,
1f transport guide,
1 g Roller 2 Charge amount partial reduction means,
2a Discharge liquid discharge recording head,
2a ₁ nozzle 3 ink discharge recording head,
3a nozzle,
3a ₁ nozzle plate,
3b substrate,
3c piezoelectric vibrator,
3d frame,
3e diaphragm,
3e ₁ diaphragm diaphragm,
3f Ink common liquid chamber,
3g fluid resistance part,
3h ink pressurizing chamber,
3i Liquid chamber unit 4 Paper feeder,
4a Paper feed roller,
4b separation pad,
4c Paper loading part 5 Carriage 6 Humidity detection sensor 7 Temperature detection sensor 8 Surface potential detection sensor

Claims (42)

  In an image forming method for forming a recorded image on a recording medium by ejecting ink, a recording image is formed by ejecting ink onto the recording medium after partially reducing the charge amount of the recording medium being conveyed. An image forming method.   The image forming method according to claim 1, wherein the recording medium is formed by holding and transporting the recording medium with an electrostatic force.   3. The image forming method according to claim 1, wherein the charge amount in the vicinity of a recorded image formed by ejecting ink onto a recording medium to be conveyed is partially reduced, and then the ink is ejected onto the recording medium. And forming a recorded image.   4. The image forming method according to claim 1, wherein a discharge image is attached to the recording medium, and a recording image is formed by partially reducing a charge amount of the recording medium. Method.   5. The image forming method according to claim 4, wherein the neutralizing liquid has a lower viscosity than the ink.   6. The image forming method according to claim 4, wherein the neutralizing liquid is transparent and prevents ink bleeding.   7. The image forming method according to claim 4, wherein the neutralizing liquid has a penetrant having permeability to a recording medium.   8. The image forming method according to claim 4, wherein discharge liquid of a droplet larger than ink for forming a recorded image by discharging onto a recording medium is discharged and adhered to the recording medium. An image forming method.   9. The image forming method according to claim 4, wherein the discharge liquid is discharged away from the recording medium rather than the ink for forming the recording image by discharging the recording medium to the recording medium. An image forming method characterized by adhering.   10. The image forming method according to claim 4, wherein the charge eliminating liquid is ejected based on image data formed by ejecting ink onto a recording medium. Method.   11. The image forming method according to claim 4, wherein a recorded image is formed by discharging a charge eliminating liquid in accordance with a change in ambient temperature. .   12. The image forming method according to claim 4, 5, 6, 7, 8, 9, 10 or 11, wherein a recording image is formed by discharging a charge eliminating liquid in accordance with a change in ambient humidity. Forming method.   13. The image forming method according to claim 4, 5, 6, 7, 8, 9, 10, 11 or 12, wherein a recording image is formed by discharging a charge eliminating liquid in accordance with a change in the surface potential of the recording medium. An image forming method.   14. The image forming method according to claim 4, 5, 6, 7, 8, 9, 10, 11, 12, or 13, wherein at least two inks are formed on the inner side of an ink that is ejected onto a recording medium to form a recorded image. An image forming method, wherein a discharge image is discharged from a position and adhered to a recording medium (P) to form a recorded image.   15. The image forming method according to claim 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 or 14, wherein the charge eliminating liquid is discharged and adhered to the recording medium in a stripe shape. An image forming method.   15. The image forming method according to claim 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 or 14, wherein the charge eliminating liquid is discharged and adhered to the recording medium in a lattice pattern. An image forming method.   15. The image forming method according to claim 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 or 14, wherein the charge eliminating liquid is ejected and adhered to the recording medium in a zigzag manner. An image forming method.   The image forming method according to any one of claims 4 to 17, wherein the discharging liquid is ejected to adhere to the recording medium with a landing interval of 1 mm or less.   In an image forming apparatus that discharges ink to form a recording image on a recording medium, a conveying unit that conveys the recording medium that forms the recording image, and a charge amount of the recording medium conveyed by the conveying unit are partially And a discharge amount recording head for forming a recorded image by discharging ink onto a recording medium after the charge amount is partially reduced by the charge amount partial reduction means. An image forming apparatus.   20. The image forming apparatus according to claim 19, wherein the transport unit holds the recording medium with an electrostatic force.   21. The image forming apparatus according to claim 19 or 20, wherein the charge amount partial reduction unit charges the vicinity of a recorded image formed by ejecting ink onto a recording medium transported by the transport unit using an ink ejection recording head. An image forming apparatus characterized by partially reducing the amount.   The image forming apparatus according to claim 19, 20 or 21, wherein the charge amount partial reduction means partially reduces the charge amount of the recording medium by adhering a charge eliminating liquid to the recording medium. Image forming apparatus.   23. The image forming apparatus according to claim 22, wherein the charge eliminating liquid that the charge amount partial reduction unit adheres to the recording medium is more than the ink that is ejected by the ink ejection recording head and adheres to the recording medium to form a recording image. An image forming apparatus having a low viscosity.   24. The image forming apparatus according to claim 23, wherein the viscosity of the charge eliminating liquid adhered to the recording medium by the charge amount partial reduction means is 1.0 (cP) to 20 (cP). apparatus.   25. The image forming apparatus according to claim 22, wherein the charge eliminating solution that adheres to the recording medium by the charge amount partial reduction unit is transparent and prevents ink bleeding.   26. The image forming apparatus according to claim 22, wherein the charge elimination liquid that the charge amount partial reduction unit adheres to the recording medium is made of a penetrating agent and has permeability to the recording medium. An image forming apparatus.   27. The image forming apparatus according to claim 22, wherein the surface tension of the neutralizing liquid adhered to the recording medium by the charge amount partial reduction unit is 20 (dyne / cm) to 60 (dyne /). cm)).   28. The image forming apparatus according to claim 22, wherein the charge amount partial reduction means discharges the charge removal liquid to partially reduce the charge amount of the recording medium. An image forming apparatus comprising a head.   29. The image forming apparatus according to claim 28, wherein the discharging liquid discharge recording head includes a nozzle that discharges a discharging liquid having an inner diameter larger than that of an ink discharging recording head that discharges ink onto a recording medium to form a recording image. An image forming apparatus comprising:   30. The image forming apparatus according to claim 28 or 29, wherein the static elimination liquid discharge recording head is arranged farther from the recording medium than an ink discharge recording head that discharges ink to the recording medium to form a recording image. An image forming apparatus.   31. The image forming apparatus according to claim 28, 29 or 30, wherein the discharging liquid discharge recording head discharges the discharging liquid according to image data for forming a recorded image by discharging ink onto a recording medium by the ink discharging recording head. An image forming apparatus.   32. The image forming apparatus according to claim 28, 29, 30 or 31, wherein the discharging liquid discharge recording head discharges a discharging liquid in response to a change in temperature in the apparatus main body.   33. The image forming apparatus according to claim 32, wherein the discharging liquid discharge recording head discharges the discharging liquid at a temperature of 20 (° C.) or less in the apparatus main body.   34. The image forming apparatus according to claim 28, 29, 30, 31, 32, or 33, wherein the discharging liquid discharge recording head discharges the discharging liquid in response to a change in humidity in the apparatus main body. Forming equipment.   35. The image forming apparatus according to claim 34, wherein the discharging liquid discharge recording head discharges the discharging liquid when the humidity in the apparatus body is 50% or less.   36. The image forming apparatus according to claim 28, 29, 30, 31, 32, 33, 34, or 35, wherein the discharging liquid discharge recording head corresponds to a change in surface potential of a recording medium in the apparatus main body. An image forming apparatus that discharges water.   37. The image forming apparatus according to claim 36, wherein the discharging liquid discharge recording head discharges the discharging liquid when the surface potential of the recording medium in the apparatus main body is 150 (V) or more.   36. The image forming apparatus according to claim 28, 29, 30, 31, 32, 33, 34, or 35, wherein the discharging liquid discharge recording head discharges ink onto a recording medium to form a recording image. An image forming apparatus characterized in that at least two of them are arranged on the inside.   39. The image forming apparatus according to claim 28, 29, 30, 31, 32, 33, 34, 35, 36, 37 or 38, wherein the discharging liquid discharge recording head discharges the discharging liquid and stripes on the recording medium. An image forming apparatus that adheres in a shape.   39. The image forming apparatus according to claim 28, 29, 30, 31, 32, 33, 34, 35, 36, 37 or 38, wherein the discharging liquid discharge recording head discharges the discharging liquid to the recording medium, An image forming apparatus that adheres in a shape.   39. The image forming apparatus according to claim 28, 29, 30, 31, 32, 33, 34, 35, 36, 37 or 38, wherein the discharging liquid discharge recording head discharges the discharging liquid to the recording medium in a zigzag manner. An image forming apparatus that adheres in a shape.   The image forming apparatus according to any one of claims 28 to 41, wherein the discharging liquid discharge recording head discharges the discharging liquid and adheres the recording medium with a landing interval of 1 mm or less. apparatus.

Images