JP2004106359A - Ink jet recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that a fixing promotion liquid and ink cannot be prevented from reaction hardening by a simple configuration to obtain a line type ink jet recording apparatus having a stable printing quality and a superior reliability for a long period of time. <P>SOLUTION: The ink jet recording apparatus is equipped with a recording unit 1 which includes a full line type fixing promotion liquid head 12 and an ink recording head 13, a transfer roller pair 2 which constitutes a first transfer part for transferring papers to the fixing promotion liquid head of the recording unit 1, a transfer guide 3 for guiding the paper transfer by the transfer roller pair 2, and a transfer belt 4 which constitutes a second transfer part independent of the first transfer part for transferring papers to the ink recording head for jetting the ink of the recording unit 1. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
[Industrial applications]
The present invention relates to an ink jet recording apparatus, and more particularly to an ink jet recording apparatus that forms an image on a recording medium using an ink recording head capable of discharging ink and a fixing promoting liquid head capable of discharging a fixing promoting liquid.
[0002]
[Prior art]
2. Description of the Related Art An ink jet recording apparatus used as an image recording apparatus or an image forming apparatus such as a printer, a facsimile, a copying apparatus, etc., performs recording by discharging ink from an ink recording head onto a recording medium such as recording paper, and has a high definition image. Can be recorded at high speed, running costs are low, noise is low, and it is easy to record a color image using multicolor inks.
[0003]
In particular, in a full-line type ink jet recording apparatus using an ink recording head in which a large number of ejection ports are arranged along the entire width of the recording paper in the recording width direction, the recording speed is remarkably higher than that of a serial type ink jet recording apparatus. It is possible. In such a full-line type ink jet recording apparatus, from the point of high-speed recording, the recording paper is transported at a constant speed just below the ink recording heads arranged in the transport direction of the recording paper, and ink droplets are ejected to perform recording. A so-called one-pass printing is performed.
[0004]
By the way, when the ink jet head used in the ink jet recording apparatus is left in a non-recording state, the ink viscosity in the discharge port increases due to evaporation or the like. The phenomenon of the disabled state occurs. Therefore, in general, for example, when an ejection port that does not eject ink droplets continuously for a certain period of time occurs, these ejection ports are specified, or ink droplets are ejected from all ejection ports a predetermined number of times. Preliminary ejection for discharging the thickened ink in the mouth is performed.
[0005]
For example, in a serial type ink jet recording apparatus, a preliminary ejection area for performing preliminary ejection of ink droplets is set separately from an area for recording on recording paper, and a carriage is periodically moved to the preliminary ejection area. The method of performing the recovery operation in the above is known as a well-known method.
[0006]
However, in the case of a full-line type ink jet recording apparatus, providing a head in a pre-ejection area separate from a recording area as in a serial type ink jet recording apparatus and moving the head to this pre-ejection area is a full-line type head. However, since the size is larger than that of the serial type head, it is difficult to reduce the recording speed.
[0007]
Therefore, a full-line type ink jet recording apparatus that performs recording on recording paper placed on a carrier has been proposed. In this case, preliminary ejection is performed on the carrier, and the ink that has been preliminary ejected on the carrier is discharged. A method has been proposed in which a cleaning roller or the like provided downstream of a transport body is pressed against the transport body to wipe off ink that has been preliminary ejected by the movement of the transport body.
[0008]
However, in this ink jet recording apparatus, since the wiping / cleaning means is provided at the most downstream side, the ink on the carrier by the preliminary ejection performed by the upstream ink recording head requires time from the time of preliminary ejection to the time of cleaning. As a result, there is a problem that ink drying, sticking, and the like occur during that time.
[0009]
Further, as disclosed in Japanese Patent No. 2667401 and JP-A-8-20159, a fixing-promoting liquid head (which discharges a processing liquid for promoting ink fixing and improving image density and water resistance). When the head is used in combination, the preliminary ejection liquid of the fixing promoting liquid and the preliminary ejection liquid of the ink immediately react and solidify, so that there is a problem that the cleaning by the cleaning roller or the like as described above becomes impossible.
[0010]
Therefore, Japanese Patent Application Laid-Open No. 2000-127362 proposes a method of disposing the carrier cleaning means by the number of heads in the transport direction, adjacent to each ink recording head, and on the downstream side in the transport direction. I have. Japanese Patent Application Laid-Open No. 2000-21159 discloses a method in which a preliminary ejection cover having an opening formed between an ink recording head and recording paper is provided, and ink is ejected onto the recording paper through this opening, and preliminary ejection liquid is ejected onto the preliminary ejection cover. Has been proposed.
[0011]
[Problems to be solved by the invention]
However, the method disclosed in JP-A-2000-127362 has the following problems. That is, when the cleaning means is a wiping method, not only is it difficult to completely clean because of wiping once, but also the pre-discharged fixing promoting liquid and ink are diffused by wiping over a wide area on the carrier, During long-term use, dirt and the solidification of the reaction between the fixing promoting liquid and the ink are inevitable, requiring special cleaning of the transport body by a user or a service person.
[0012]
Further, since the fixing-promoting liquid and ink remain on the cleaning means itself such as the cleaning roller, the preliminary discharge liquid and ink are dried and solidified by standing, and the carrier is cleaned in a dried and solidified state. Remains on the conveyance body, and when the conveyance method of the recording paper is the conveyance body of the electrostatic attraction method, a phenomenon that the image position on the recording paper is shifted due to a decrease in the adsorption force occurs, and the image quality is deteriorated.
[0013]
Further, the cleaning means needs to wipe the fixing promoting liquid and the ink evenly in the entire width direction of the recording paper by wiping once.However, it is difficult to make the cleaning means contact the conveyance body with a uniform pressure distribution in the longitudinal direction. The greater the size of the recording paper, the more difficult it is, resulting in a reduced cleaning effect. Further, if the cleaning means is repeatedly brought into contact with and separated from the transporting body, the load of the transporting body is fluctuated, so that the driving means of the transporting body becomes complicated and expensive, and also causes noise.
[0014]
On the other hand, the method disclosed in JP-A-2000-215159 has the following problems. That is, the preliminary ejection cover needs to be disposed between the ink recording head and the conveyance body, but usually, the distance between the ejection port of the ink recording head and the recording paper is about 1 mm in consideration of the variation in the ejection direction of the ink droplets. It is very difficult to keep a thin preliminary ejection cover uniformly in such a small gap in the recording paper transport direction of the ink recording head.
[0015]
Further, it is necessary to move the opening of the preliminary discharge cover by reciprocating or rotating in synchronization with the presence or absence of recording, which causes an increase in size and cost of the ink jet recording apparatus.
[0016]
The present invention has been made in view of the above points, and an ink jet recording apparatus that records an image on recording paper using an ink recording head capable of ejecting ink and a head capable of ejecting a fixing promoting liquid is provided. It is an object of the present invention to provide an ink jet recording apparatus which prevents solidification of a reaction between an accelerating liquid and an ink, has stable printing quality, and has excellent long-term reliability.
[0017]
[Means for Solving the Problems]
In order to solve the above problems, an inkjet recording apparatus according to the present invention includes a first transport unit for transporting a recording medium to a fixing promoting liquid head, and ink recording independent of the first transport unit. And a second transport unit that transports the recording medium to the head.
[0018]
Here, it is preferable that the second transport unit includes a transport belt that transports the recording medium. In this case, the ink recording head performs preliminary ejection of ink that is not used for image recording toward the transport belt. Is preferred.
[0019]
Further, the first transport section preferably includes a transport belt that transports the recording medium. In this case, the preliminary discharge of the fixing promoting liquid that is not used for image recording from the fixing promoting liquid head toward the transport belt is performed. Preferably.
[0020]
When the preliminary discharge is performed on the transport belt, the transport belt is preferably provided with a preliminary discharge opening. In this case, the preliminary discharge ink corresponding to the preliminary discharge opening is used. It is preferable that a preliminary discharge liquid reservoir to be stored is provided, and it is preferable that the preliminary discharge liquid reservoir be provided with an absorber and a discharge means for discharging the preliminary discharge liquid to the waste liquid reservoir.
[0021]
Further, it is preferable that a partition member for partitioning between the first transport unit and the second transport unit is provided, and that the partition member be provided on a head frame on which the ink recording head and the preliminary ejection head are mounted.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. A first embodiment of an ink jet recording apparatus according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic configuration diagram of the vicinity of a head portion of the recording apparatus, and FIG. 2 is a perspective view of a main part of FIG.
[0023]
This inkjet recording apparatus is a full-line type inkjet recording apparatus, and includes a recording unit 1 that forms an image by discharging a fixing promoting liquid and ink droplets onto a recording medium (hereinafter, referred to as “paper”), and a recording unit. A conveyance roller pair 2 constituting a first conveyance unit for conveying a sheet to a fixing promotion liquid head which discharges the first fixing promotion liquid, a conveyance guide 3 for guiding sheet conveyance by the conveyance roller pair 2, and a recording unit And a transport belt 4 constituting a second transport section independent of the first transport section for transporting the paper to the ink recording head that ejects one ink.
[0024]
Although not shown, a paper feed unit for stacking and holding sheets on the conveying roller pair 2 and supplying the sheets one by one when necessary, and a sheet feeding unit for separating the recording-completed sheet from the conveying belt 4 and discharging the sheet to a stack. A paper discharge section, an ink supply section for supplying ink to the ink recording head, a waste liquid holding section for holding ink discharged by preliminary ejection or a waste liquid of a fixing promoting liquid, and an ink receiving section for receiving data from a host computer. A control unit for controlling the driving of the printing apparatus is provided, for example, for transferring data to the printing head, driving the head, and controlling the driving of the conveying roller pair 2 and the conveying belt 4.
[0025]
The recording unit 1 includes, on the head frame 11, a fixing processing liquid head that discharges a fixing promoting liquid, that is, a processing liquid for promoting ink fixing and improving image density and water resistance, on the upstream side in the sheet transport direction. And four ink recording heads 13a, 13b, 13c, and 13d that discharge ink toward the downstream side in the paper transport direction (the direction indicated by the arrow A in FIG. 2). (The four heads are also collectively referred to as “ink recording head 13”).
[0026]
Each of the fixing processing liquid head 12 and the ink recording head 13 is a full line head. In this embodiment, since recording is performed in a so-called one pass, the nozzle density has a nozzle density of 600 dpi or more. The head has a width substantially the same as that in the hand direction and has 4800 or more nozzles over a recording width of 8 inches.
[0027]
The fixing processing liquid head 12 and the ink recording head 13 include a head that deforms a vibration plate with an electromechanical conversion element such as a piezoelectric element to discharge droplets, and a liquid that generates bubbles using an electrothermal conversion element. Various heads can be used, such as a head that discharges droplets and a head that discharges droplets by deforming the diaphragm with electrostatic force.
[0028]
Also, here, using four ink recording heads 13a, 13b, 13c, and 13d, yellow (Y), magenta (M), cyan (C), and black (Bk) inks are ejected from each head. However, it is also possible to use a head that discharges six or seven colors of ink to which three colors of ink or a light color of ink are added.
[0029]
The head frame 11 has a rack gear 11a, which is arranged so as to be driven up and down by a motor 15, and is moved downward (in the direction of arrow B in FIG. 2) during a printing operation.
[0030]
The recording unit 1 is provided on the cap frame 21 via a plunger 23 and a return spring 24 so as to be independently drivable in a vertical direction. 25 and four support members 26a to 26d. Cap members 27 and 28a for capping the discharge ports of the fixing processing liquid head 12 and the ink recording head 13 are provided on the support members 25 and 26a to 26d, respectively. ~ 28d is attached.
[0031]
The cap frame 21 is provided so as to be movable in the paper transport direction by a motor 29, and is moved in the transport direction upstream direction (the direction of arrow C in FIG. 2) during capping.
[0032]
Further, the head frame 11 holds a partition member 17 between the ink recording head 13 d and the fixing promoting liquid head 12, and has the same distance from the sheet as the ink recording head 13 and the fixing promoting liquid head 12. Is kept.
[0033]
An opening 31 is formed in the transport guide 3 for allowing the fixing promoting liquid preliminarily discharged from the fixing promoting liquid head 12 to pass therethrough, and a preliminary discharging liquid for storing the preliminary discharging fixing promoting liquid corresponding to the opening 31 is formed. The reservoir 32 is arranged. In the preliminary discharge liquid reservoir 32, an absorber 33 for absorbing the preliminary discharge liquid is provided.
[0034]
The transport belt 4 is an electrostatic attraction belt that attracts and transports a sheet using electrostatic force, and is stretched between rollers 35 and 36 that are driven to rotate. As such an electrostatic adsorption belt, in a belt made of an insulating material, comb-shaped conductive electrodes are configured so as to face each other in the transport direction, and each convex portion enters each concave portion, By feeding power to each comb-tooth electrode with a brush, an electrostatic force is generated to electrostatically attract the paper.
[0035]
The present invention is not limited to this. For example, a charging roller is arranged so as to be in contact with a transport belt made of an insulating material, and a positive or negative voltage is applied to the charging roller to perform electrostatic attraction. An electro attraction belt or the like can be used.
[0036]
As described above, by using the electrostatic attraction type conveyance belt 4, the flatness between the ink recording heads 13a to 13d having a long conveyance distance is prevented by preventing cockling and curling due to the adhesion of ink droplets on paper. The paper can be reliably transported in a state where it has been cut, and the image quality can be improved.
[0037]
A cleaning roller 37 including an ink absorber for cleaning the ink preliminarily ejected onto the conveyor belt 4 is brought into contact with the conveyor belt 4.
[0038]
In the ink jet recording apparatus thus configured, during the printing operation, the motor 15 is driven to lower the head frame 11 of the recording unit 1 in the direction of arrow B, and the ink recording head 13, the fixing promoting liquid head 12, In addition, the image recording is performed in a state where the lower surface of the partition member 17 is close to the conveyed sheet.
[0039]
Also, for example, during printing standby, the head frame 11 is moved upward, the motor 29 is driven to move the support 21 in the direction of the arrow C, and the cap frame 25, 26a to 26d is moved to each head 12, After moving to the position corresponding to 13, the head frame 11 is moved downward, and the energization of the plunger 23 of the cap frames 25, 26a to 26d is stopped, whereby the cap frames 25, 26a to 26d rise. Then, the cap members 27 and 28a to 28d come into contact with the fixing promoting liquid head 12 and the ejection surfaces of the respective ink recording heads 13 to perform capping.
[0040]
The paper is fed from the paper feeding direction in FIG. 1 and is transported by the transport roller 2 below the fixing promoting liquid head 12. Subsequently, the sheet is conveyed below the ink recording head 13 by the conveying belt 4 and discharged after recording.
[0041]
Thus, the predischarge operation and the image recording operation will be described overall.
As described above, the sheet is transported to the area corresponding to the fixing promoting liquid head 12 by the transport roller 2, and the leading edge position of the sheet is detected by a sensor (not shown). Here, preliminary ejection of the fixing promoting liquid from the fixing promoting liquid head 12 is performed at a predetermined time before the leading end of the sheet is located immediately below the discharge port of the fixing promoting liquid head 12. Following the preliminary ejection, the fixing promoting liquid head 12 discharges the recording fixing promoting liquid onto the sheet from a predetermined image recording start position from the leading end of the sheet.
[0042]
Prior to image recording, the ink recording head 13 preliminarily discharges ink of each color to a predetermined position on the conveyor belt 4. When the image recording start position comes just below the discharge port of each ink recording head 13, the ink recording head 13 Image recording is performed. The ink preliminarily ejected onto the transport belt 4 is wiped off by a cleaning roller 37 having an ink absorber disposed in contact with the transport belt 4.
[0043]
Thus, in this ink jet recording apparatus, the first transport section for transporting the paper corresponding to the fixing promoting liquid head, and the paper corresponding to the ink recording head independently of the first transport section. Since the printer has the second transport unit for transporting, the preliminary discharge of the fixing promoting liquid and the ink is performed at another place, and particularly, the transport belt for transporting the paper which is required to reliably transport the paper with high accuracy is transported. When it is used as a means, it is possible to prevent the fixing promoting liquid and the ink from being mixed and solidified by reaction on the transport belt, so that an image can be formed with stable printing quality and long-term reliability can be improved.
[0044]
Further, a partition member 17 is disposed between the fixing promoting liquid head 12 and the ink recording head 13, and the partition member 17 is located at a position close to the paper during image recording, similarly to the ink recording head 13 and the fixing promoting liquid head 12. , The diffusion of the mist generated by the fixing promoting liquid or the ink during image recording is prevented, and the mist of the fixing promoting liquid is prevented from adhering to the conveyor belt 4 and solidifying by reaction with the ink. More stable image quality and improved long-term reliability.
[0045]
Next, an ink jet recording apparatus according to a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a schematic configuration diagram of the vicinity of the head section similar to FIG.
In this embodiment, the transport belt 4 constituting the second transport unit is stretched between four rollers 41 to 44, and the transport belt 4 has a preliminary discharge ink through which ink preliminary discharged from the ink recording head 13 passes. Opening 45 is formed.
[0046]
A pre-discharge liquid reservoir 46 for storing the pre-discharged ink that has passed through the opening 45 is disposed below a portion of the transport belt 4 facing the ink recording head 13. Inside, an ink absorber 47 for absorbing the preliminary ejection liquid is provided.
[0047]
Further, pumps 51 and 52 for discharging the preliminary discharge liquid absorbed by the absorbers 33 and 47 are connected to the preliminary discharge liquid reservoir 32 for the fixing promoting liquid and the preliminary discharge liquid reservoir 46 for the ink. A waste liquid reservoir 53 for storing a preliminary discharge liquid sucked and discharged from 51 and 52 is provided, and an absorber 54 is also provided in the waste liquid reservoir 53.
[0048]
A method of preliminary ejection from the ink recording head 13 in this recording apparatus will be described. The leading edge position of the sheet and the leading edge position of the opening 45 of the transport belt 4 are detected by two sensors (not shown) provided on both sides in the width direction of the sheet, and at the same time, the center position of the opening 45 determined from the opening width is determined. Desired.
[0049]
A predetermined number of preliminary ejections of ink are performed in a state where the center position of the opening 45 is almost immediately below the ejection opening of the ink recording head 13a, and the preliminary ejection liquid is stored in the preliminary ejection liquid reservoir 46 through the opening 45. Discharged.
[0050]
Subsequently, with the conveyance of the paper, the opening 45 moves as the conveyor belt 4 moves, and the timing at which the opening 45 is located immediately below the ejection opening of the ink recording head 13b is detected, and preliminary ejection of ink is performed. Similarly, the timing at which the opening 45 is located immediately below the ejection ports of the ink recording heads 13c and 13d is detected, and preliminary ejection of ink is performed.
[0051]
Further, the image recording start position from the leading edge of the sheet is obtained, and the preliminary ejection liquid for image recording and the ejection of each ink are performed according to the conveyance of the sheet, and the image recording ends. Note that the cleaning of the transport belt 4 is performed in preparation for an abnormality in which the ink is ejected from the opening 45 of the transport belt 4 and the preliminary ejection ink or the image recording ink is ejected and lands on the transport belt 4 when the ejection direction is bad. A roller 37 is also provided.
[0052]
With such a configuration, the same operation and effect as those of the first embodiment can be obtained, and an opening is provided in the transport belt, and the ink of the preliminary discharge is discharged to the preliminary discharge liquid reservoir through the opening. Reduces the risk of the preliminary ejection ink adhering to the conveyor belt and contaminating the ink, more reliably preventing the solidification of the reaction between the fixing promoting liquid and the ink, and reducing the risk of ink adhering to the back side of the paper. Can be obtained.
[0053]
In addition, since there is a discharging means for discharging the ink and the fixing promoting liquid of the preliminary discharge liquid reservoir to the waste liquid reservoir, the absorption performance of the absorber of the preliminary discharge liquid reservoir can be maintained for a long time, and the mist on the surface of the absorber can be reduced. Pollution can be prevented.
[0054]
Next, an ink jet recording apparatus according to a third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a schematic configuration diagram near the head unit similar to FIG.
In this embodiment, the configuration of the second transport unit is the same as that of the second embodiment, and the first transport unit further includes a transport roller pair 2 and a transport belt 65 stretched between four rollers 61 to 64. It consists of.
[0055]
An opening 66 for preliminary discharge through which the fixing promoting liquid preliminary discharged from the fixing promoting liquid head 12 passes is formed in the transport belt 65, and the preliminary discharging liquid for the fixing promoting liquid corresponds to the opening 66. The reservoir 32 is arranged. Further, a cleaning roller 67 including an absorber is brought into contact with the transport belt 65.
[0056]
Further, pumps 51 and 52 for discharging the preliminary discharge liquid absorbed by the absorbers 33 and 47 are connected to the preliminary discharge liquid reservoir 32 for the fixing promoting liquid and the preliminary discharge liquid reservoir 46 for the ink. A waste liquid reservoir 53 for storing a preliminary discharge liquid sucked and discharged from 51 and 52 is provided, and an absorber 54 is also provided in the waste liquid reservoir 53.
[0057]
A method of preliminary ejection from the fixing promoting liquid head 12 in this recording apparatus will be described. The leading edge position of the sheet and the leading edge position of the opening 66 of the transport belt 64 are detected by two sensors (not shown) provided on both sides in the width direction of the sheet, and the center position of the opening 66 determined from the opening width is determined. Desired.
[0058]
A predetermined number of preliminary ejections of the fixing promoting liquid are performed in a state where the center position of the opening 66 is almost immediately below the discharge port of the fixing promoting liquid head 12, and the preliminary discharging liquid is supplied through the opening 66. It is discharged to the reservoir 32.
[0059]
Note that the cleaning roller 67 of the transport belt 65 is also prepared in case the discharge direction is bad and the fixing promoting liquid of the preliminary discharge is discharged from the opening 66 of the transport belt 65 and lands on the transport belt 65. Are placed.
[0060]
With this configuration, the operation and effect of the second embodiment can be obtained, and a transport belt for transporting the paper corresponding to the fixing promoting liquid head is provided, and the transport belt is provided with an opening. The preliminary discharge liquid is discharged to the preliminary discharge liquid reservoir through the pre-discharge liquid, so that the fixing discharge liquid preliminarily discharged onto the conveyor belt is prevented from adhering and contaminating. The solidification can be prevented, the possibility that the fixing promoting liquid or the ink adheres to the back surface of the paper is reduced, and a high quality recording result can be obtained.
[0061]
【The invention's effect】
As described above, according to the ink jet recording apparatus of the present invention, the transport section is separated from the ink recording head section and the fixing promoting liquid head section, so that the solidification of the reaction between the fixing promoting liquid and the ink can be prevented. It is possible to perform printing with stable printing quality and excellent long-term reliability.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a vicinity of a head unit for explaining a first embodiment of an ink jet recording apparatus according to the present invention. FIG. 2 is a perspective view illustrating a main part of FIG. 1. FIG. FIG. 4 is a schematic diagram illustrating the vicinity of a head unit according to a second embodiment of the present invention. FIG. 4 is a schematic diagram illustrating the structure near a head unit according to a third embodiment of the ink jet recording apparatus according to the present invention.
DESCRIPTION OF SYMBOLS 1 ... Recording unit, 2 ... Conveying roller pair, 3 ... Conveying guide, 4 ... Conveying belt, 11 ... Head frame, 12 ... Fixing promoting liquid head, 13a-13d ... Ink recording head, 17 ... Partition member.

Claims (10)

In an ink jet recording apparatus for forming an image on a recording medium by using an ink recording head capable of discharging ink and a fixing promoting liquid head capable of discharging a fixing promoting liquid, the recording medium is formed with respect to the fixing promoting liquid head. And a second transport section for transporting the recording medium to the ink recording head independently of the first transport section. apparatus. 2. The ink jet recording apparatus according to claim 1, wherein the second conveyance unit includes a conveyance belt that conveys the recording medium. 3. 3. The ink jet recording apparatus according to claim 2, wherein a preliminary ejection of ink not used for image recording is performed from the ink recording head toward the transport belt. The inkjet recording apparatus according to claim 1, wherein the first transport unit includes a transport belt that transports the recording medium. 5. The ink jet recording apparatus according to claim 4, wherein a preliminary discharge of a fixing promoting liquid that is not used for recording an image is performed from the fixing promoting liquid head toward the transport belt. 6. The ink jet recording apparatus according to claim 3, wherein the transport belt is provided with the opening for the preliminary ejection. 7. The ink jet recording apparatus according to claim 6, wherein a pre-discharge liquid reservoir for storing pre-discharged ink is provided corresponding to the preliminary discharge opening. 8. The ink jet recording apparatus according to claim 7, wherein an absorber is provided in the preliminary discharge liquid reservoir, and discharge means for discharging the preliminary discharge liquid to the waste liquid reservoir is provided. The ink jet recording apparatus according to any one of claims 1 to 8, further comprising a partition member for separating between the first transport section and the second transport section. 10. The ink jet recording apparatus according to claim 9, wherein the partition member is provided on a head frame on which the ink recording head and the preliminary ejection head are mounted.

Images