JP4178950B2 - Inkjet recording device - Google Patents

Description

【０１１０】
（２）図２に示すように、定着機の出口ローラに出口ローラねじり量調整手段を設け、記録媒体幅ｗ（ｍｍ）、記録媒体幅端部におけるねじり量ｙ１（ｍｍ）、ねじり量変更所要時間ｔ（ｓｅｃ）を、それぞれ表２に示した通りとして定着ベルトの斜行を調整した場合の記録媒体の定着ベルト表面からの剥がれ具合について評価した。
【０１１１】
評価の基準は以下の通りである。
○：記録媒体１００枚で全く剥がれはない。
△：記録媒体１００枚で１枚しか剥がれない。
×：記録媒体１００枚で２枚以上の剥がれがある。
【０１１２】
【表２】

【０１１３】
（３）図４に示すように、定着機の加圧ローラに加圧ローラねじり量調整手段を設け、加圧ローラねじり量調整手段は、前記加熱ローラと加圧ローラとの間のニップ幅ｄ（ｍｍ）、記録媒体幅端部におけるねじり量ｙ２（ｍｍ）を、それぞれ表３に示した通りとして定着ベルトの斜行を調整した場合の記録媒体の定着ベルト表面からの剥がれ具合について評価した。
【０１１４】
評価の基準は以下の通りである。
○：記録媒体１００枚で全く剥がれはない。
△：記録媒体１００枚で１枚しか剥がれない。
×：記録媒体１００枚で２枚以上の剥がれが発生する。
【０１１５】
【表３】

【０１１６】
（４）図４に示すように、定着機の加圧ローラに加圧ローラねじり量調整手段を設け、定着ベルトの線速ｖ（ｍｍ／ｓ）、記録媒体幅端部におけるねじり量ｙ２（ｍｍ）、ねじり量変更所要時間ｔ（ｓｅｃ）を、それぞれ表４に示した通りとして定着ベルトの斜行を調整した場合の記録媒体の定着ベルト表面からの剥がれ具合について評価した。
【０１１７】
評価の基準は以下の通りである。
○：記録媒体１００枚で全く剥がれはない。
△：記録媒体１００枚で１枚しか剥がれない。
×：記録媒体１００枚で２枚以上の剥がれが発生する。
【０１１８】
【表４】

【０１１９】
【発明の効果】
本発明によれば、定着手段として定着ベルトを有するインクジェット記録装置において、定着ベルトの斜行に起因する定着ベルト表面からの記録媒体の剥離を防止し、記録媒体の定着ムラをなくして均一な定着を行うことにより光沢ムラのない高品質の画像プリントを得ることができる。
【図面の簡単な説明】
【図１】インクジェット記録装置の概略構成を示す側面図
【図２】定着機の一態様の概略構成を示す斜視図
【図３】出口ローラのねじり量を示す説明図
【図４】定着機の別の態様の概略構成を示す斜視図
【図５】（ａ）はニップ幅を示す説明図、（ｂ）は加圧ローラのねじり量を示す説明図
【図６】定着機の更に別の態様の概略構成を示す斜視図
【図７】定着機の更に別の態様の概略構成を示す側面図
【図８】記録媒体の積層構成を示す断面図
【符号の説明】
１：記録媒体
１ａ：記録面
２：記録部
２ａ：記録ヘッド
３：カッターユニット
４：スイッチバック部
４ａ：切替ゲート
５：定着機
５１：加熱ローラ
５２：発熱体
５３：出口ローラ
５４：定着ベルト
５５：加圧ローラ
６：出口ローラねじり量調整手段
７：寄り検知手段
８：加圧ローラねじり量調整手段
９：寄り調整ローラねじり量調整手段
１０：第１搬送ローラ対
２０：第２搬送ローラ対
３０：第３搬送ローラ対
４０：第４搬送ローラ対
５０：第５搬送ローラ対
６０：第６搬送ローラ対
７０：排出ローラ対
Ａ、Ｂ：搬送路
Ｃ：排出口[0001]
BACKGROUND OF THE INVENTION
According to the present invention, recording is performed by ejecting ink onto a recording medium having thermoplastic resin particles, and the recording medium after recording is heated and pressurized by a fixing unit to fix the thermoplastic resin particles of the recording medium. Inkjet recording device In place Related.
[0002]
[Prior art]
Inkjet recording, in which an image is recorded on a recording medium having thermoplastic resin particles, is made by transparentizing (fixing) the thermoplastic resin particles in the recording medium by heating and pressurizing the recording medium after recording. It is known for preventing bleeding due to contact with water of an image, improving scratch resistance, and creating a high-quality and high-quality print approaching that of a silver salt photograph.
[0003]
Conventionally, as a fixing means for fixing thermoplastic resin particles in a recording medium, an endless fixing belt is stretched between a heating roller and an exit roller, and the fixing belt is sandwiched and pressed against the heating roller. A fixing unit configured by arranging a pressure roller has been proposed. According to such a fixing unit, a nip between the heating roller and the pressure roller, specifically, formed between the pressure roller and the fixing belt when the pressure roller is pressed against the heating roller. After heating and pressurizing the recording medium by passing it through the nip, the recording medium is conveyed in a state of being in close contact with the fixing belt and coming to the vicinity of the exit roller disposed on the recording medium unloading side. Is slightly cooled and then peeled off from the surface of the fixing belt and discharged from the exit roller, so that a high gloss is obtained compared to a fixing means that simply fixes with a heating roller and a pressure roller. Fixing can be performed.
[0004]
In order to perform good fixing with no fixing failure in such a fixing unit, the recording medium that has passed between the heating roller and the pressure roller is in close contact with the exit roller without being peeled off from the surface of the fixing belt. On the other hand, when the recording medium reaches the exit roller, it is necessary that the recording medium is quickly peeled off from the surface of the fixing belt and smoothly discharged from the fixing unit. For this reason, the recording medium after passing between the heating roller and the pressure roller is conveyed to the exit roller while being in close contact with the surface of the fixing belt in a state of being easily peeled off. Accordingly, in an ink jet recording apparatus having such a recording medium fixing means, it is important to avoid inadvertent peeling of the recording medium from the surface of the fixing belt in order to obtain a high-quality and high-quality print. come.
[0005]
One of the causes of peeling of the recording medium from the surface of the fixing belt is a problem of belt skew. That is, there are some causes for the fixing belt, for example, (1) twisting of the heating roller and the outlet roller, (2) twisting of the pressure roller and the heating roller, (3) circumferential length difference of the fixing belt, (4) heating Cylindricity of roller, (5) cylindricity of exit roller, (6) nip pressure, (7) tension of fixing belt, (8) tension imbalance, (9) nip force imbalance, (10) fixing belt Due to the thickness of the roller, (11) the rubber hardness of the pressure roller, and (12) the rubber thickness of the pressure roller. Driving causes belt bias (belt skew). As a result, the fixing belt approaches one side in the width direction, and the adhesion of the recording medium to the surface is released, and the fixing belt is peeled off from the surface of the fixing belt at an early stage.
[0006]
Conventionally, as a means for preventing the skew of the belt, it has been considered to provide a roller with a flange that regulates the deviation of the belt (Patent Document 1), but when the skew of the belt becomes large, the belt rides on the flange and breaks the belt. This is not preferable because there is a problem.
[0007]
[Patent Document 1]
JP-A-8-133517
[0008]
[Problems to be solved by the invention]
Therefore, an object of the present invention is to have a fixing belt as fixing means. Inkjet In a recording apparatus, by preventing the recording medium from peeling from the surface of the fixing belt due to the skew of the fixing belt, and eliminating the uneven fixing of the recording medium, and performing uniform fixing Luster The object is to be able to obtain a high-quality image print without unevenness.
[0009]
[Means for Solving the Problems]
The above problems are solved by the following invention.
[0010]
In the first aspect of the invention, recording is performed by ejecting ink onto a recording medium having thermoplastic resin particles. Sheet-like sheet cut to a predetermined size In the ink jet recording apparatus for fixing the thermoplastic resin particles of the recording medium by heating and pressurizing the recording medium by the fixing unit, the fixing unit includes a heating roller disposed on the recording medium carry-in side, and the recording medium. An exit roller disposed on the carry-out side, a fixing belt stretched across the heating roller and the exit roller, a pressure roller pressed against the heating roller across the fixing belt, and the fixing A deviation detecting means for detecting a deviation of the belt, and an outlet roller twist amount adjusting means for adjusting a twist amount of the outlet roller based on the deviation detection of the fixing belt by the deviation detecting means, and the outlet roller twist amount The adjusting means includes an axial distance between the heating roller and the outlet roller as L (mm), a recording medium width as w (mm), and a twist at the recording medium width end. When the the y1 (mm), 1 × 10 to y1 / w / L ^-5 ~ 1x10 ^-3 The inkjet recording apparatus is characterized by the following.
[0011]
According to the second aspect of the present invention, recording is performed by ejecting ink onto a recording medium having thermoplastic resin particles. Sheet-like sheet cut to a predetermined size In the ink jet recording apparatus for fixing the thermoplastic resin particles of the recording medium by heating and pressurizing the recording medium by the fixing unit, the fixing unit includes a heating roller disposed on the recording medium carry-in side, and the recording medium. An exit roller disposed on the carry-out side, a fixing belt stretched across the heating roller and the exit roller, a pressure roller pressed against the heating roller across the fixing belt, and the fixing A deviation detecting means for detecting a deviation of the belt, and an outlet roller twist amount adjusting means for adjusting a twist amount of the outlet roller based on the deviation detection of the fixing belt by the deviation detecting means, and the outlet roller twist amount The adjusting means sets the recording medium width to w (mm), the torsion amount at the end of the recording medium width to y1 (mm), and the torsion amount change required time to t (sec). When, 0.003 to the y1 / w / t 0.1 The inkjet recording apparatus is characterized by the following.
[0012]
According to the third aspect of the present invention, recording is performed by ejecting ink onto a recording medium having thermoplastic resin particles. Sheet-like sheet cut to a predetermined size In the ink jet recording apparatus for fixing the thermoplastic resin particles of the recording medium by heating and pressurizing the recording medium by the fixing unit, the fixing unit includes a heating roller disposed on the recording medium carry-in side, and the recording medium. An exit roller disposed on the carry-out side, a fixing belt stretched across the heating roller and the exit roller, a pressure roller pressed against the heating roller across the fixing belt, and the fixing A deviation detecting means for detecting a deviation of the belt, and an outlet roller twist amount adjusting means for adjusting a twist amount of the outlet roller based on the deviation detection of the fixing belt by the deviation detecting means, and the outlet roller twist amount The adjusting means includes an axial distance between the heating roller and the outlet roller as L (mm), a recording medium width as w (mm), and a twist at the recording medium width end. When the the y1 (mm), 1 × 10 to y1 / w / L ^-5 ~ 1x10 ^-3 And when the time required to change the torsion is t (sec), y1 / w / t is 0.003 to 0.003. 0.1 The inkjet recording apparatus is characterized by the following.
[0013]
The invention according to claim 4 4. The ink jet according to claim 1, wherein a nip pressure between the heating roller and the pressure roller is 0.1 MPa to 2 MPa. It is a recording device.
[0014]
The invention according to claim 5 5. The inkjet according to claim 1, wherein the fixing belt is formed by applying any one of a fluorine-based resin, perfluoroalkoxyalkane, and curable silicon to nickel electroforming. It is a recording device.
[0015]
The invention described in claim 6 6. The ink jet according to claim 1, wherein the ink is a pigment ink. It is a recording device.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
FIG. 1 is a side view showing an outline of the overall configuration of an ink jet recording apparatus according to the present invention.
[0022]
The recording medium 1, which will be described in detail later, is a recording medium having thermoplastic resin particles in its layer structure, and is a drive motor (not shown) in the form of a long roll paper wound in a roll shape. Is sandwiched between a first conveying roller pair 10 including a driving roller 11 and a driven roller 12 that are rotationally driven by the rotation, and conveyed to the recording unit 2.
[0023]
The recording unit 2 is provided with a recording head 2a movably along a main scanning direction substantially orthogonal to the conveyance direction of the recording medium 1, and a predetermined direction from the recording head 2a toward the recording surface 1a of the recording medium 1 is provided. By ejecting ink at the timing, a desired image is recorded in cooperation with the conveyance of the recording medium 1 by the first conveying means 10.
[0024]
The recording medium 1 on which an image is recorded and formed on the recording surface 1 a by the recording head 2 a in the recording unit 2 is cut into a predetermined size by the cutter unit 3. The cut recording medium 1 is conveyed to the switchback unit 4 by the second conveying roller pair 20 including the driving roller 21 and the driven roller 22 and the third conveying roller pair 30 including the driving roller 31 and the driven roller 32. The The recording medium 1 is not limited to the one supplied from the illustrated roll paper, but may be a sheet-like material cut in advance to a prescribed size. In this case, the cutter unit 3 is not necessarily provided. Good.
[0025]
The switchback unit 4 is provided with a fourth conveying roller pair 40, and the cut recording medium 1 that has been conveyed in the conveying path A by the second conveying roller pair 20 and the third conveying roller pair 30, After being once received from the leading side, the direction is then changed from the trailing end side to be conveyed to a conveying path B toward the fixing device 5 described later. Reference numeral 4a denotes a transfer path switching gate which can be switched by a driving means (not shown).
[0026]
A fifth conveyance roller pair 50 and a sixth conveyance roller pair 60 are further disposed in the conveyance path B between the fourth conveyance roller pair 40 and the fixing device 5, and each conveyance roller pair 40, 50, The recording medium 1 in the transport path B switched back by 60 is transported to the fixing device 5.
[0027]
The fixing device 5 includes a heating element 52 such as a halogen lamp heater as a heat source therein, and is rotationally driven by driving of a heating roller 51 disposed on the carry-in side of the recording medium 1 and a driving motor (not shown), and recording. The endless fixing belt 54 that is stretched between the exit roller 53 disposed on the carry-out side of the medium 1 and the heating roller 51 are pressed with a predetermined pressure so as to sandwich the fixing belt 54. The fixing unit includes a pressure roller 55 made of rubber. The fixing belt 54 is disposed so as to face the recording surface 1a of the recording medium 1 in this embodiment. The recording medium 1 conveyed to the heating roller 51 is sandwiched between a fixing belt 54 and a pressure roller 55, and the thermoplastic resin particles contained in the layer structure of the recording medium 1 are melted and smoothed. Let it through It is of, imparting a gloss to the recording surface 1a of the recording medium 1.
[0028]
At this time, it is preferable that the fixing temperature by heating of the heating roller 51 is equal to or higher than the Tg of the thermoplastic resin particles in order to appropriately transparentize the thermoplastic resin particles and obtain a high-quality image print. The fixing temperature is preferably equal to or lower than the thermal deformation temperature of a support (details will be described later) constituting the recording medium 1. A temperature higher than the heat deformation temperature is not preferable because the recording medium 1 is warped or undulated during fixing. The temperature in the fixing device 5 is controlled based on the temperature detected by a temperature sensor (not shown) arranged near the heating roller 51 or the fixing belt 54.
[0029]
The recording medium 1 on which the image is fixed in the fixing device 5 is discharged from the discharge port C to the outside of the apparatus by the discharge roller pair 70.
[0030]
Here, the configuration of the fixing device 5 will be further described with reference to FIG. FIG. 2 is a perspective view showing a schematic configuration of the fixing device 5.
[0031]
At one end of the shaft core 53a of the outlet roller 53 of the fixing machine 5, an eccentric gear 63 to which the rotational driving force of the drive motor 64 is transmitted via the motor gear 61 and the transmission gear 62 is shifted from the rotational shaft. It is rotatably attached via a bearing 53b. Therefore, when the eccentric gear 63 rotates, the position of one end of the shaft core 53a of the outlet roller 53 attached at a position shifted from the rotational axis of the eccentric gear 63 is shifted, and the other end of the shaft core 53a is moved. The exit roller 53 tilts about the center. In this aspect, the eccentric gear 63 is rotated to tilt the shaft 53a of the exit roller 53 along the direction (arrow BB ′) intersecting the driving direction of the fixing belt 54 (arrow A direction). Thus, the arrangement configuration of the eccentric gear 63 and the shaft core 53a of the outlet roller 53 is appropriately adopted, and thereby the twist amount of the outlet roller 53 for twisting the fixing belt 54 can be adjusted. ing.
[0032]
Here, the drive motor 64 is driven and controlled by the control means 65. In this embodiment, the motor gear 61, the transmission gear 62, the eccentric gear 63, the drive motor 64 and the control means 65 are used to twist the exit roller. The adjusting means 6 is configured.
[0033]
In the vicinity of both end portions of the fixing belt 54, a deviation detecting means 7 including optical sensors 7a and 7b is disposed, and by detecting the positions of both end portions of the fixing belt 54, fixing during driving is performed. A deviation in the width direction of the belt 54 is detected. The use of the optical sensors 7a and 7b is a preferable mode because the deviation due to the skew of the fixing belt 54 can be detected without contact. As the optical sensors 7a and 7b, in addition to the reflection type sensor shown in the figure, a transmission type sensor in which a light projecting part and a light receiving part are arranged to face each other with the fixing belt 54 interposed therebetween may be used.
[0034]
Each optical sensor 7a, 7b is electrically connected to the control means 65 so that a detection signal is input, and any one of the optical sensors 7a or 7b detects the side end portion of the fixing belt 54. When the deviation is detected, the detection signal is input to the control means 65. Based on the detection signal, the control means 65 drives the drive motor 64 in either the forward or reverse direction, and rotationally drives the eccentric gear 63 in either the forward or reverse direction via the motor gear 61 and the transmission gear 62. As a result, the axis 53a of the outlet roller 53 is tilted to adjust the amount of twist of the outlet roller 53. For example, in FIG. 2, when the optical sensor 7 a detects the skew to the left of the fixing belt 54, the control unit 65 controls the drive motor 64 to appropriately rotate the eccentric gear 63, and the shaft of the exit roller 53 Tilt so that the right end of the core 53a is in the downward direction. As a result, the fixing belt 54 is driven so that the exit roller 53 side is twisted and moved to the right side, and returned to a normal state. Further, when the optical sensor 7b detects the skew to the right of the fixing belt 54, the control is performed in reverse to the above.
[0035]
The adjustment of the twist amount of the exit roller 53 by the exit roller twist amount adjusting means 6 is performed such that the distance between the axes of the heating roller 51 and the exit roller 53 is L (mm), the width of the recording medium 1 is w (mm), and the recording medium. When the torsion amount at the width end portion 1 ′ of 1 is y1 (mm) (see FIG. 3), y1 / w / L is 1 × 10 ^-Five ~ 1x10 ^-3 It is preferable that the recording medium 1 is controlled so that the separation of the recording medium 1 from the surface of the fixing belt 54 can be prevented as much as possible and good fixing without occurrence of gloss unevenness is performed. The above value is 1 × 10 ^-Five Smaller than 1x10 ^-3 Even larger values are not preferable because peeling of the recording medium 1 from the surface of the fixing belt 54 is likely to occur. In order to fix the recording medium 1 more stably, the above value is set to 1 × 10. ^-Five ~ 1x10 ^-Four More preferably.
[0036]
Further, the adjustment of the twist amount of the exit roller 53 by the exit roller twist amount adjusting means 6 is that the width of the recording medium 1 is w (mm), the twist amount at the width end 1 ′ of the recording medium 1 is y1 (mm), and the twist. When the time required for changing the amount is t (sec), it is also preferable that y1 / w / t is controlled to be 0.003 to 0.3 for the same reason as described above. Even if the above value is smaller than 0.003 or larger than 0.3, it is not preferable because the recording medium 1 easily peels off from the surface of the fixing belt 54. In order to fix the recording medium 1 more stably, the above value is more preferably 0.003 to 0.1.
[0037]
Furthermore, in the present invention, if the above values for y1 / w / L and y1 / w / t are satisfied at the same time, the recording medium 1 can be fixed more stably and satisfactorily without peeling. This is a preferred embodiment because it can.
[0038]
FIG. 4 shows another embodiment of the fixing device 5. The same reference numerals as those in FIG.
[0039]
In this embodiment, instead of the configuration in which the exit roller twist amount adjusting means 6 is provided in the exit roller 53, the pressure roller twist amount adjusting means 8 is provided in the pressure roller 55.
[0040]
That is, the eccentric gear 83 to which the rotational driving force of the driving motor 84 is transmitted via the motor gear 81 and the transmission gear 82 is shifted from the rotational shaft at one end of the shaft core 55a of the pressure roller 55 of the fixing device 5. It is rotatably attached to the position via a bearing 55b. Therefore, when the eccentric gear 83 rotates, the position of one end of the shaft core 55a of the pressure roller 55 attached at a position shifted from the rotational axis of the eccentric gear 83 is shifted, and the other end of the shaft core 55a is shifted. The pressure roller 55 tilts around the center. In this embodiment, the rotation of the eccentric gear 83 causes the shaft core 55a of the pressure roller 55 to be centered on the other end of the shaft core 55a in a direction parallel to the driving direction (arrow A direction) of the fixing belt 54 ( The eccentric gear 83 and the shaft core 55a of the pressure roller 55 are appropriately arranged so as to be tilted along the direction of the arrow BB ', thereby giving a twist to the fixing belt 54. Therefore, the torsion amount of the pressure roller 55 can be adjusted.
[0041]
Here, the drive motor 84 is driven and controlled by the control means 85. In this embodiment, the motor gear 81, the transmission gear 82, the eccentric gear 83, the drive motor 84 and the control means 85 are used to twist the pressure roller. The amount adjusting means 8 is configured.
[0042]
Each of the optical sensors 7a and 7b is electrically connected to the control means 85 so that a detection signal is input, and any one of the optical sensors 7a or 7b detects the side end portion of the fixing belt 54. When the deviation is detected, the detection signal is input to the control means 85. Based on the detection signal, the control means 85 drives the drive motor 84 in either the forward or reverse direction, and rotationally drives the eccentric gear 83 in either the forward or reverse direction via the motor gear 81 and the transmission gear 82. As a result, the shaft core 55a of the pressure roller 55 is tilted to adjust the amount of twist of the pressure roller 55. For example, in FIG. 4, when the optical sensor 7 a detects the skew to the left of the fixing belt 54, the control unit 85 controls the drive motor 84 to appropriately rotate the eccentric gear 83, so that the pressure roller 55 The right end of the shaft core 55a is tilted slightly away from the exit roller 53. As a result, the nip between the heating roller 51 and the pressure roller 55 drives the fixing belt 54 toward the right side, and the fixing belt 54 is returned to a normal state. Further, when the optical sensor 7b detects the skew to the right of the fixing belt 54, the control is performed in reverse to the above.
[0043]
The adjustment of the torsion amount of the pressure roller 55 by the pressure roller torsion amount adjusting means 8 is such that the nip width between the heating roller 51 and the pressure roller 55 is d (mm), and the torsion at the width end 1 ′ of the recording medium 1 is performed. When the amount is y2 (mm) (see FIGS. 5A and 5B), it is controlled from the surface of the fixing belt 54 of the recording medium 1 that y2 / d is controlled to be 0.1-5. Peeling can be prevented as much as possible, and it is preferable for good fixing without occurrence of uneven gloss. Even if the above value is smaller than 0.1 or larger than 5, it is not preferable because peeling of the recording medium 1 from the surface of the fixing belt 54 easily occurs. In order to fix the recording medium 1 more stably, the above value is more preferably 0.1-2.
[0044]
Further, the adjustment of the torsion amount of the pressure roller 55 by the pressure roller torsion amount adjusting means 8 is performed by setting the linear velocity of the fixing belt 54 to v (mm / s) and the torsion amount at the width end 1 ′ of the recording medium 1 to y2. It is preferable that y2 / v / t is controlled to be 0.2 to 7 when (mm) and the time required for changing the twist amount is t (sec). Even if the above value is smaller than 0.2 or larger than 7, it is not preferable because the recording medium 1 easily peels off from the surface of the fixing belt 54. In order to fix the recording medium 1 more stably, the above value is more preferably 0.2-2.
[0045]
Furthermore, in the present invention, it is preferable that the above values for y2 / d and y2 / v / t are satisfied at the same time, because the recording medium 1 can be fixed more stably and satisfactorily. It is an aspect.
[0046]
FIG. 6 shows still another aspect of the fixing device 5. The same reference numerals as those in FIG.
[0047]
In this embodiment, in addition to the heating roller 51 and the outlet roller 53, a deviation adjusting roller 56 for adjusting the deviation of the fixing belt 54 is provided. The fixing belt 54 includes the heating roller 51, the outlet roller 53, and this deviation. An adjustment roller 56 is included on the inner side and is stretched over each.
[0048]
Here, the deviation adjusting roller 56 is in contact with the inner surface of the fixing belt 54 between the heating roller 51 and the outlet roller 53 and on the side opposite to the contact side with the recording medium 1 with a predetermined pressure. It also functions as a tension roller for applying a predetermined tension to 54.
[0049]
An eccentric gear 93 to which the rotational driving force of the drive motor 94 is transmitted via the motor gear 91 and the transmission gear 92 is disposed at one end of the shaft core 56a of the shift adjusting roller 56. It is attached to be rotatable. Therefore, when the eccentric gear 93 rotates, the position of one end of the shaft core 56a of the shift adjusting roller 56 attached to a position shifted from the rotational axis of the eccentric gear 93 is shifted, and the other end of the shaft core 56a. The center adjustment roller 56 tilts around the center. In this aspect, the rotation of the eccentric gear 93 causes the shaft core 56 a of the shift adjustment roller 56 to cross the driving direction (arrow A direction) of the fixing belt 54 (arrow BB ′ direction). The eccentric gear 93 and the shaft core 56a of the offset adjusting roller 56 are appropriately arranged so as to be tilted, whereby the torsion amount of the offset adjusting roller 56 for twisting the fixing belt 54 is adjusted. It is possible.
[0050]
Here, the drive motor 94 is driven and controlled by the control means 95. In this aspect, the motor gear 91, the transmission gear 92, the eccentric gear 93, the drive motor 94 and the control means 95 are used to adjust the twist of the roller. A quantity adjusting means 9 is configured.
[0051]
Each of the optical sensors 7a and 7b is electrically connected to the control means 95 so that a detection signal is input, and one of the optical sensors 7a or 7b detects the side end portion of the fixing belt 54. When the deviation is detected, the detection signal is input to the control means 95. Based on the detection signal, the control means 95 drives the drive motor 94 in either the forward or reverse direction, and rotationally drives the eccentric gear 93 in either the forward or reverse direction via the motor gear 91 and the transmission gear 92. As a result, the shaft core 56a of the deviation adjusting roller 56 is tilted to adjust the amount of twist of the deviation adjusting roller 56. For example, in FIG. 6, when the optical sensor 7 a detects the left skew of the fixing belt 54, the control means 95 controls the drive motor 94 to appropriately rotate the eccentric gear 93, thereby The right end of the shaft core 56a is tilted slightly downward. As a result, the fixing belt 54 is twisted by the deviation adjusting roller 56 and driven in the direction toward the right side, and returned to a normal state. Further, when the optical sensor 7b detects the skew to the right of the fixing belt 54, the control is performed in reverse to the above.
[0052]
As described above, the shift adjusting roller 56 is provided in addition to the heating roller 51 and the exit roller 53, and the skew of the fixing belt 54 is adjusted by adjusting the twist amount of the shift adjusting roller 56. Since it is not necessary to adjust the torsion amounts of the heating roller 51 and the exit roller 53 as in the embodiment, the fixing belt 54 is not twisted in the sheet passing portion of the recording medium 1 from the heating roller 51 to the exit roller 53. The recording medium 1 can be conveyed and fixed more stably.
[0053]
As shown in FIG. 7, the shift adjustment roller 56 is preferably disposed at a position farther from the exit roller 53 as viewed from the heating roller 51. In this case, in addition to the same effect as described above, the amount of winding of the fixing belt 54 around the deviation adjusting roller 56 can be increased, so that the effect of adjusting the skew of the fixing belt 54 with respect to the amount of twist of the deviation adjusting roller 56 is further increased. Can be bigger. In FIG. 7, the deviation adjusting roller twist amount adjusting means 9 is not shown.
[0054]
In the fixing device 5 described above, the nip pressure between the heating roller 51 and the pressure roller 55 is set to 0.1 MPa to 2 MPa so that an appropriate pressure is applied to the recording medium 1. This is preferable because sufficient gloss can be imparted to the recording surface 1a, good fixing can be performed, and the skew of the fixing belt 54 can be controlled within a controllable range. When the nip pressure is smaller than 0.1 MPa, it is difficult to appropriately make the thermoplastic resin particles transparent in the fixing device 5. On the other hand, if it exceeds 2 MPa, wrinkles are likely to occur in the recording medium 1 and skewing of the fixing belt 54 becomes difficult to control, which is not preferable.
[0055]
Here, an example of the configuration of the fixing belt 54 of the fixing device 5 will be described.
[0056]
As the base material for the belt member used for the fixing belt 54, aluminum, iron, polyethylene or the like can be used, but seamless nickel electroforming is preferably used. The thickness of the substrate is preferably 10 μm to 100 μm.
[0057]
The surface roughness of the substrate is preferably 0.1 μm or less, and more preferably 0.08 μm or less. Furthermore, Young's modulus is 50 kN / mm. ² Or more, and more preferably 50 kN / mm. ² ~ 300kN / mm ² It is.
[0058]
A surface treatment layer is formed on the surface of the substrate (the surface on the side in contact with the recording medium 1). This surface treatment layer has a JIS K 5401 for the surface treatment layer in order to reduce fluctuations in glossiness at the time of image fixing and to effectively prevent peeling of a release layer (described later) at the time of fixing. It is an essential requirement that the pencil hardness specified in 1 is HB or more, but the pencil hardness is preferably in the range of H to 5H, particularly preferably in the range of 2H to 5H.
[0059]
Further, in order to prevent gloss unevenness more effectively, the swelling rate defined in JIS K 6911 of the surface treatment layer is preferably less than 5%, more preferably 3% or less, particularly preferably. Is in the range of 1% or less.
[0060]
The surface treatment layer exhibiting pencil hardness and swelling rate as described above improves the adhesion between the base material of the fixing belt 54 and the release layer described later, and prevents uneven gloss during fixing. From the viewpoint of performing appropriately, it is preferable to contain a surface modifier. As the surface modifier, an aluminum coupling agent and a zirconium coupling agent are preferable, and an aluminum coupling agent is particularly preferably used.
[0061]
The aluminum coupling agent and zirconium coupling agent described above do not have adhesiveness, but when the surface of the material to be bonded (base material of the fixing belt 54) is treated with a coupling agent solution, the coupling agent is hydrolyzed. -It has the effect | action which raise | generates a condensation reaction and improves the adhesiveness of the base-material surface.
[0062]
Specific examples of the aluminum coupling agent and the zirconium coupling agent are shown below, but the fixing belt 54 according to the present invention is not limited thereto.
[0063]
<< Specific examples of aluminum coupling agents >>
Acetmethoxyaluminum diisopropylate
Acetoethoxyaluminum diisopropylate
Acetoalkoxyaluminum diisopropylate
Aluminum di-n-butoxide monomethyl acetate
Aluminum di-n-butoxide monoethyl acetate
Aluminum isopropylate
Mono sec-butoxyaluminum diisopropylate
Aluminum sec-butylate
Aluminum ethylate
Ethyl acetoacetate aluminum diisopropylate
Aluminum tris (ethyl acetoacetate)
Alkyl acetoacetate aluminum diisopropylate
Aluminum monoacetyl acetoacetate bis (ethyl acetoacetate)
Aluminum tris (acetylacetonate)
Aluminum = monoisopropoxy monooroxyethyl acetoacetate
Cyclic aluminum oxide isopropylate
[0064]
<< Specific examples of zirconium coupling agents >>
Zirconium tetraacetyl acetate
Zirconium dibutoxybisacetylacetonate
Zirconium trifoxy acetyl acetonate
Zirconium tetrakis ethyl acetoacetate
Zirconium butoxy tris acetylacetoacetate
Diliconium butoxybisethyl acetoacetate
Ziliconium trifoxy-monoethyl acetoacetate
Gilliconium tetrakis ethyl lactate
Ziriconium dibutoxybisethyl lactate
Bisacetylacetonate bisethylacetoacetate zirconium
Monoacetylacetonate trisethylacetoacetate zirconium
Zirconium chelate compounds such as bisacetylacetonate bisethyl lactate zirconium
Zirconium n-butylate
Zirconium alkoxides such as zirconium n-propylate
[0065]
<< Film thickness of surface treatment layer >>
The thickness of the surface treatment layer is preferably in the range of 0.2 μm to 10 μm, more preferably in the range of 0.2 μm to 3 μm.
[0066]
<Contents of aluminum coupling agent and zirconium coupling agent>
The range of the preferable content of the aluminum coupling agent and the zirconium coupling agent in the surface treatment layer is 1% by mass to 100% by mass, and more preferably 50% by mass to 100% by mass.
[0067]
Moreover, the following titanium coupling agent can be used together for a surface treatment layer. That is, as specific examples of the titanium coupling agent, isopropyl triisostearoyl titanate, isopropyl tri (N-aminoethyl / aminoethyl) titanate, diisopropyl bis (dioctyl pyrophosphate) titanate, tetraisopropyl bis (dioctyl phosphite) titanate, Tetraoctylbis (ditridecylphosphite) titanate, tetra (2,2-diallyloxymethyl-1-butyl) bis (ditridecyl) phosphite titanate, bis (dioctylpyrophosphate) oxyacetate titanate, bis (dioctylpyrophosphate) ethylene Titanate, dibutoxytitanium-bis (octylene glycolate), dipropoxytitanium-bis (ethylacetylacetate), dipropoxytita N-bis (triethanolaminate), tetrapropoxy titanium, tetrabutoxy titanium and the like.
[0068]
<Release layer>
As the releasable layer, it is preferable to apply any one of fluorine resin, perfluoroalkoxyalkane (PFA), and curable silicone. More preferably, a release layer having a peeling force of 30 g / 5 cm or more is used.
[0069]
As the curable silicone resin, for example, a silicone resin prepared using a curable silicone such as a solvent-added silicone or a condensation-type silicone as shown below is preferable. Preferred are silicone resins.
[0070]
The solvent addition type silicone can be obtained by reacting linear methyl vinyl polysiloxane having vinyl groups at both ends or both ends and chains in the presence of a platinum-based catalyst.
[0071]
Specific examples of the solvent addition type silicone include, for example, KS-887, KS-779H, KS-778, KS-835, X-62-2456, X-62-2494, X-62-2461 manufactured by Shin-Etsu Silicone. , KS-3650, KS-3655, KS-3600, KS-847, KS-770, KS-770L, KS-776A, KS-856, KS-775, KS-830, KS-830E, KS-839, X -62-2404, X-62-2405, KS-3702, X-62-2232, KS-3503, KS-3502, KS-3703, KS-5508 and the like.
[0072]
As specific examples of the condensation curable silicone, silicones such as KS-881, KS-882, KS-883, X-62-9490, and X-62-9028 manufactured by Shin-Etsu Silicone are preferably used.
[0073]
The surface contact angle of the releasable layer is preferably 100 degrees to 120 degrees, and more preferably 105 degrees to 115 degrees. Here, the surface contact angle is a measurement of the contact angle with pure water. For example, using an automatic contact angle meter DAC-VZ (manufactured by Kyowa Interface Science Co., Ltd.) Measure the contact angle 0.5 seconds after hanging and contacting).
[0074]
The surface roughness of the release layer is preferably 0.2 μm or less, and more preferably 0.1 μm or less.
[0075]
The thickness of the releasable layer is preferably 1 μm to 50 μm, more preferably 10 μm to 30 μm.
[0076]
Further, the peeling force of the release layer is preferably adjusted to be 30 g / 5 cm or more, more preferably adjusted to a range of 30 g / 5 cm to 1000 g / 5 cm, particularly preferably 50 g. / 5 cm to 600 g / 5 cm.
[0077]
Here, the peeling force of the releasable layer is measured by the following method.
[0078]
(Method for measuring peel force of releasable layer)
Adhesive tape (knit polyester tape No. 31B (manufactured by Nitto Denko Corporation)) is bonded to the release layer of the fixing belt, and the pressure roller 1 is set with the pressure value of the pressure roller set to 2 kg. After rotating and crimping, the fixing belt was allowed to stand at room temperature for 20 hours, and then the adhesive tape was peeled off using a commercially available tensile tester at an angle of 180 degrees and a speed of 0.3 m / min. Was measured.
[0079]
As described above, the fixing belt has the surface treatment layer and the release layer on the base material. However, an adhesion improving layer may be provided from the viewpoint of further effectively preventing the release layer from peeling off. Good.
[0080]
Next, an example of the recording medium 1 used in the ink jet recording apparatus according to the present invention will be described.
[0081]
As shown in FIG. 8, the recording medium 1 has an ink receiving layer 1B containing thermoplastic resin particles on the surface of the support 1A, and a color material and an ink solvent component are adjacent to the ink receiving layer 1B. At least a pigment ink solvent absorbing layer 1C having a void layer in which the ink solvent component is absorbed after separation on the surface of the receiving layer 1B is configured.
[0082]
As the support 1A, a support conventionally used as an ink jet recording medium can be used. For example, in addition to a paper support such as plain paper, art paper, coated paper and cast coated paper, plastic support And a paper support coated with polyolefin on both sides, and a composite support obtained by bonding them together can be used.
[0083]
Examples of the thermoplastic resin particles contained in the ink receiving layer 1B include polycarbonate, polyacrylonitrile, polystyrene, polyacrylic acid, polymethacrylic acid, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyester, polyamide, poly Examples include ethers, copolymers thereof, and salts thereof. The thermoplastic resin particles are appropriately selected in consideration of ink acceptability, glossiness of an image after fixing by heating and pressing, image fastness, and releasability.
[0084]
Regarding the ink receptivity, when the particle diameter of the thermoplastic resin particles is less than 0.05 μm, the separation of the pigment particles and the ink solvent in the pigment ink is delayed, resulting in a decrease in the ink absorption rate. On the other hand, when the thickness exceeds 10 μm, it is not preferable from the viewpoint of adhesion to the pigment ink solvent absorbing layer 1C adjacent to the ink receiving layer 1B when coating on the support and the film strength of the recording medium after coating and drying. For this reason, the preferable thermoplastic resin particle diameter is preferably 0.05 to 10 μm, more preferably 0.1 to 5 μm.
[0085]
The thermoplastic resin particles forming the outermost layer exist in a dispersed state in a solvent such as water before coating and drying. In the case of a single thermoplastic resin particle having no dispersion in the dispersed particle size, the particles are packed in a close-packed hexagonal form by drying after coating to form a single particle layer, and the porosity at that time is about 26%. It is. However, the thermoplastic resin particles are usually polydispersed, and the porosity thereof varies depending on the aggregation state of the thermoplastic resin particles. In addition, the formed void diameter depends on the particle diameter of the thermoplastic resin particles.
[0086]
Moreover, as a coating film thickness on 1 A of support bodies, 0.1-10 micrometers is preferable, More preferably, it is 0.5-7 micrometers.
[0087]
As a criterion for selection of the thermoplastic resin particles, there is a glass transition point (Tg). When Tg is lower than the coating / drying temperature, for example, the coating / drying temperature at the time of production of the recording medium is already higher than Tg, and voids due to the thermoplastic fine particles for allowing the ink solvent to pass through disappear. If Tg is equal to or higher than the temperature at which the support 1A is denatured by heat, a fixing operation at a high temperature is required to perform melt film formation after ink jet recording with pigment ink, and the load on the apparatus and the heat of the support 1A Stability, etc. becomes a problem. The preferable Tg of the thermoplastic resin particles is 50 to 150 ° C., and the temperature control in the fixing device 5 described above uses this Tg as a target temperature.
[0088]
After the image formation, the recorded image needs to suppress image quality deterioration due to its storage over time as much as possible. When pigment ink is used, there is no need to worry about density reduction and discoloration in a relatively short period of time, as with dye ink, but it is possible to suppress yellowing (decomposition) of unprinted parts by UV light. Therefore, it is necessary to select thermoplastic resin particles.
[0089]
The pigment ink solvent absorption layer 1C adjacent to the outermost ink receiving layer 1B needs to have the ability to absorb pigment ink solvent. This is because inorganic solid fine particles (hereinafter also simply referred to as inorganic fine particles) It is exhibited by containing it in the solvent absorption layer.
[0090]
Examples of the inorganic fine particles used for the above purpose include light calcium carbonate, heavy calcium carbonate, magnesium carbonate, kaolin, clay, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc hydroxide, zinc sulfide. , Zinc carbonate, hydrotalcite, aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, synthetic amorphous silica, colloidal silica, alumina, colloidal alumina, pseudoboehmite, aluminum hydroxide, lithopone, zeolite, magnesium hydroxide, etc. Examples thereof include white inorganic pigments.
[0091]
The average particle diameter of the inorganic fine particles is the simple average value obtained by observing the fine particles themselves or the fine particles appearing on the cross section or surface of the void-type pigment ink solvent absorption layer with an electron microscope and determining the average particle diameter of 100 arbitrary particles. It is calculated as (number average). Here, the particle size of each fine particle is represented by a diameter assuming a circle equal to the projected area.
[0092]
From the viewpoint of forming a high density image, recording a clear image, and producing at low cost, the inorganic solid fine particles include fine particle silica, colloidal silica and alumina or alumina water synthesized by a vapor phase method. It is preferable to use inorganic solid fine particles selected from Japanese. Alumina or alumina hydrate may be crystalline or non-crystalline, and those having any shape such as amorphous particles, spherical particles, and acicular particles can be used. At present, fine particle silica synthesized by such a gas phase method is commercially available, and commercially available fine particle silica includes various types of Aerosil manufactured by Nippon Aerosil Co., Ltd.
[0093]
Although there is no restriction | limiting in particular in the average particle diameter of an inorganic fine particle, 100 nm or less is preferable and the most preferable average particle diameter for forming a space | gap layer changes with compounds. For example, in the case of the above-mentioned vapor phase method silica, the one having the average particle size of primary particles of inorganic fine particles dispersed in the state of primary particles (particle size in the dispersion state before coating) is 4 to 20 nm is the most. It can be preferably used.
[0094]
As the pigment ink solvent absorbing layer 1C, in addition to using the above-mentioned inorganic fine particles, various hydrophilic resins and silicas described in, for example, JP-A Nos. 59-148583, 55-51583, 58-72495, etc. And a urethane resin emulsion containing an alkylene oxide or polycarbonate described in JP-A-9-150574 and JP-A-10-181189 can also be used.
[0095]
In addition to forming a pigment ink solvent absorption layer using the inorganic fine particles, a coating comprising a polyurethane resin emulsion, a water-soluble epoxy compound and / or acetoacetylated polyvinyl alcohol, and an epichlorohydrin polyamide resin. The pigment ink solvent absorption layer 1 </ b> C may be formed using a working liquid.
[0096]
The polyurethane resin emulsion in this case is preferably a polyurethane resin emulsion having a polycarbonate chain, a polycarbonate chain and a polyester chain and a particle diameter of 3.0 μm, and the polyurethane resin of the polyurethane resin emulsion is a polyol having a polycarbonate polyol, a polycarbonate polyol and a polyester polyol. And the polyurethane resin obtained by reacting the aliphatic isocyanate compound with a sulfonic acid group in the molecule, and further having an epichlorohydrin polyamide resin and a water-soluble epoxy compound and / or an acetoacetylated vinyl alcohol. preferable.
[0097]
In the pigment ink solvent absorption layer 1C using the polyurethane resin, it is estimated that weak aggregation of cations and anions is formed, and accordingly, voids having the ability to absorb the pigment ink solvent are formed, so that an image can be formed.
[0098]
In the ink receiving layer 1B and the pigment ink solvent absorption layer 1C of the recording medium 1, the total amount of voids (void volume) is 1 m of recording paper. ² It is preferably 20 ml or more per unit. The void volume is 20ml / m ² Less than 1 ml / m at the time of printing ² In the case of the following, the ink absorption is good, but the ink amount is 40 ml / m ² If it exceeds, the ink is not completely absorbed, and problems such as deterioration in image quality and slow drying are likely to occur.
[0099]
The upper limit of the void volume is not particularly limited, but it is necessary to make the film thickness of the void-type ink absorbing layer usually 50 μm or less so as not to deteriorate the physical properties of the coating such as cracks. 40 ml / m ² It is difficult to do this. The void volume is determined according to J.H. TAPPI paper pulp test method no. Liquid transfer amount (ml / m) at an absorption time of 2 seconds when measured by the liquid absorbency test method (Bristow method) of 51-87 paper or paperboard ² ). In the above measurement method, pure water (ion-exchanged water) is used for the measurement. However, in order to easily determine the measurement area, a water-soluble dye of less than 2% may be contained.
[0100]
When applying the recording medium, a thickener may be used to improve the coating property. As a coating method, in addition to a bar coater, a roll coater, an applicator, a spinner and the like, in the case where two or more layers are simultaneously coated from the viewpoint of improving production efficiency, extrusion coating and curtain coating are particularly effective.
[0101]
Examples of the silicon emulsion or water-soluble silicon compound preferably contained in the ink receiving layer 1B include, for example, a dimethylsiloxane compound having a functional group of siloxane as methyl and a general release agent, and a vinyl group, hydrogen as a substituent on the compound. Examples thereof include compounds into which atoms, mercapto groups, methacryl groups, acrylic groups, amino groups, phenyl groups and the like are introduced. Further, the content is preferably less than 1% by mass with respect to the thermoplastic resin particles 100. When the addition amount is 1% or more, the releasability is improved, but color unevenness estimated to be caused by nonuniformity of fixing due to heating and pressurization is not preferable.
[0102]
The ink used for the recording surface 1a of the recording medium 1 is roughly classified into a dye ink and a pigment ink. In the present invention, a high-quality image can be obtained by using the pigment ink. Moreover, it is preferable in terms of good image storage stability. Conventionally known organic and inorganic pigments can be used as the pigment ink. For example, azo pigments such as azo lakes, insoluble azo pigments, condensed azo pigments, chelate azo pigments, phthalocyanine pigments, perylene pigments, anthraquinone pigments, quinacridone pigments, dioxazine pigments, thioindigo pigments, isoindolinone pigments, quinophthalone pigments, etc. And dye lakes such as basic dye type lakes and acid dye type lakes, organic pigments such as nitro pigments, nitroso pigments, aniline black and daylight fluorescent pigments, and inorganic pigments such as carbon black.
[0103]
Specific organic pigments are exemplified below.
[0104]
Examples of pigments for magenta or red include C.I. I. Pigment red 2, C.I. I. Pigment red 3, C.I. I. Pigment red 5, C.I. I. Pigment red 6, C.I. I. Pigment red 7, C.I. I. Pigment red 15, C.I. I. Pigment red 16, C.I. I. Pigment red 48: 1, C.I. I. Pigment red 53: 1, C.I. I. Pigment red 57: 1, C.I. I. Pigment red 122, C.I. I. Pigment red 123, C.I. I. Pigment red 139, C.I. I. Pigment red 144, C.I. I. Pigment red 149, C.I. I. Pigment red 166, C.I. I. Pigment red 177, C.I. I. Pigment red 178, C.I. I. And CI Pigment Red 222.
[0105]
Examples of the orange or yellow pigment include C.I. I. Pigment orange 31, C.I. I. Pigment orange 43, C.I. I. Pigment yellow 12, C.I. I. Pigment yellow 13, C.I. I. Pigment yellow 14, C.I. I. Pigment yellow 15, C.I. I. Pigment yellow 17, C.I. I. Pigment yellow 93, C.I. I. Pigment yellow 94, C.I. I. And CI Pigment Yellow 138.
[0106]
Examples of pigments for green or cyan include C.I. I. Pigment blue 15, C.I. I. Pigment blue 15: 2, C.I. I. Pigment blue 15: 3, C.I. I. Pigment blue 16, C.I. I. Pigment blue 60, C.I. I. And CI Pigment Green 7.
[0107]
【Example】
(1) As shown in FIG. 2, the exit roller twist amount adjusting means is provided on the exit roller of the fixing device, the distance L (mm) between the heating roller and the exit roller, the recording medium width w (mm), the recording medium The twisting amount y1 (mm) at the width end portion was evaluated as shown in Table 1, and the degree of peeling of the recording medium from the surface of the fixing belt when the skew of the fixing belt was adjusted was evaluated.
[0108]
The criteria for evaluation are as follows.
A: No peeling at all on 100 recording media.
(Triangle | delta): Only 1 sheet peels with 100 recording media.
X: Two or more peeling occurs in 100 recording media.
[0109]
[Table 1]

[0110]
(2) As shown in FIG. 2, the exit roller torsion amount adjusting means is provided on the exit roller of the fixing machine, and the recording medium width w (mm), the twist amount y1 (mm) at the end of the recording medium width, and the twist amount need to be changed. With respect to the time t (sec) as shown in Table 2, the degree of peeling of the recording medium from the surface of the fixing belt when the skew of the fixing belt was adjusted was evaluated.
[0111]
The criteria for evaluation are as follows.
A: No peeling at all on 100 recording media.
(Triangle | delta): Only 1 sheet peels with 100 recording media.
X: There are two or more peelings in 100 recording media.
[0112]
[Table 2]

[0113]
(3) As shown in FIG. 4, the pressure roller torsion amount adjusting means is provided on the pressure roller of the fixing machine, and the pressure roller torsion amount adjusting means has a nip width d between the heating roller and the pressure roller. (Mm) and the twist amount y2 (mm) at the end of the recording medium width were as shown in Table 3, and the degree of peeling of the recording medium from the fixing belt surface was evaluated when the skew of the fixing belt was adjusted.
[0114]
The criteria for evaluation are as follows.
A: No peeling at all on 100 recording media.
(Triangle | delta): Only 1 sheet peels with 100 recording media.
X: Two or more peeling occurs in 100 recording media.
[0115]
[Table 3]

[0116]
(4) As shown in FIG. 4, the pressure roller torsion amount adjusting means is provided on the pressure roller of the fixing machine, the linear velocity v (mm / s) of the fixing belt, and the torsion amount y2 (mm at the end of the recording medium width). ) And torsion amount change required time t (sec) as shown in Table 4, and the degree of peeling of the recording medium from the surface of the fixing belt when the skew of the fixing belt was adjusted was evaluated.
[0117]
The criteria for evaluation are as follows.
◯: No peeling at all on 100 recording media.
(Triangle | delta): Only 1 sheet peels with 100 recording media.
X: Two or more peeling occurs in 100 recording media.
[0118]
[Table 4]

[0119]
【The invention's effect】
According to the present invention, the fixing unit has the fixing belt. Inkjet In a recording apparatus, by preventing the recording medium from peeling from the surface of the fixing belt due to the skew of the fixing belt, and eliminating the uneven fixing of the recording medium, and performing uniform fixing Luster A high-quality image print without unevenness can be obtained.
[Brief description of the drawings]
FIG. 1 is a side view showing a schematic configuration of an ink jet recording apparatus.
FIG. 2 is a perspective view illustrating a schematic configuration of an aspect of a fixing device.
FIG. 3 is an explanatory view showing the twist amount of the exit roller.
FIG. 4 is a perspective view illustrating a schematic configuration of another aspect of the fixing device.
5A is an explanatory diagram showing a nip width, and FIG. 5B is an explanatory diagram showing a torsion amount of a pressure roller.
FIG. 6 is a perspective view illustrating a schematic configuration of still another aspect of the fixing device.
FIG. 7 is a side view showing a schematic configuration of still another aspect of the fixing device.
FIG. 8 is a cross-sectional view showing a laminated structure of a recording medium
[Explanation of symbols]
1: Recording medium
1a: Recording surface
2: Recording section
2a: Recording head
3: Cutter unit
4: Switchback section
4a: Switching gate
5: Fixing machine
51: Heating roller
52: Heating element
53: Exit roller
54: fixing belt
55: Pressure roller
6: Means for adjusting the twist amount of the exit roller
7: Shift detection means
8: Pressure roller twist amount adjusting means
9: Means for adjusting the twisting amount of the shift adjustment roller
10: First conveying roller pair
20: Second conveying roller pair
30: Third conveying roller pair
40: Fourth conveying roller pair
50: Fifth transport roller pair
60: Sixth transport roller pair
70: Discharge roller pair
A, B: Transport path
C: Discharge port

Claims (6)

Recording is performed by ejecting ink onto a recording medium having thermoplastic resin particles, and heating and pressurizing a sheet-like recording medium cut into a predetermined size after recording by a fixing unit. In an inkjet recording apparatus for fixing
The fixing means is
A heating roller disposed on the carry-in side of the recording medium;
An exit roller disposed on the carry-out side of the recording medium;
A fixing belt stretched across the heating roller and the exit roller;
A pressure roller that presses against the heating roller across the fixing belt;
A deviation detecting means for detecting a deviation of the fixing belt;
Outlet roller twist amount adjusting means for adjusting the twist amount of the outlet roller based on detection of a deviation of the fixing belt by the shift detection unit;
The exit roller twist amount adjusting means is configured such that an axial distance between the heating roller and the exit roller is L (mm), a recording medium width is w (mm), and a twist amount at the end of the recording medium width is y1 (mm). In this case, the y1 / w / L is set to 1 × 10 ⁻⁵ to 1 × 10 ⁻³ . Recording is performed by ejecting ink onto a recording medium having thermoplastic resin particles, and heating and pressurizing a sheet-like recording medium cut into a predetermined size after recording by a fixing unit. In an inkjet recording apparatus for fixing
The fixing means is
A heating roller disposed on the carry-in side of the recording medium;
An exit roller disposed on the carry-out side of the recording medium;
A fixing belt stretched across the heating roller and the exit roller;
A pressure roller that presses against the heating roller across the fixing belt;
A deviation detecting means for detecting a deviation of the fixing belt;
Outlet roller twist amount adjusting means for adjusting the twist amount of the outlet roller based on detection of a deviation of the fixing belt by the shift detection unit;
The exit roller torsion amount adjusting means has a recording medium width of w (mm), a torsion amount at the end of the recording medium width of y1 (mm), and a torsion amount change required time of t (sec). An ink jet recording apparatus, wherein t is 0.003 to 0.1 . Recording is performed by ejecting ink onto a recording medium having thermoplastic resin particles, and heating and pressurizing a sheet-like recording medium cut into a predetermined size after recording by a fixing unit. In an inkjet recording apparatus for fixing
The fixing means is
A heating roller disposed on the carry-in side of the recording medium;
An exit roller disposed on the carry-out side of the recording medium;
A fixing belt stretched across the heating roller and the exit roller;
A pressure roller that presses against the heating roller across the fixing belt;
A deviation detecting means for detecting a deviation of the fixing belt;
Outlet roller twist amount adjusting means for adjusting the twist amount of the outlet roller based on detection of a deviation of the fixing belt by the shift detection unit;
The exit roller twist amount adjusting means is configured such that an axial distance between the heating roller and the exit roller is L (mm), a recording medium width is w (mm), and a twist amount at the end of the recording medium width is y1 (mm). When y1 / w / L is 1 × 10 ⁻⁵ to 1 × 10 ⁻³ and the time required for changing the twist amount is t (sec), y1 / w / t is 0.003 to 0.1 . An ink jet recording apparatus.   4. The ink jet recording apparatus according to claim 1, wherein a nip pressure between the heating roller and the pressure roller is 0.1 MPa to 2 MPa.   The ink jet recording apparatus according to claim 1, wherein the fixing belt is formed by applying any one of a fluorine-based resin, perfluoroalkoxyalkane, and curable silicon to nickel electroforming.   The inkjet recording apparatus according to claim 1, wherein the ink is a pigment ink.

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