JP3199087B2 - Ink jet printer and ink jet recording method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet printer and an ink jet recording method for forming an ink image on a transfer medium, transferring the ink image to a recording medium, and obtaining an ink image on the recording medium.

[0002]

2. Description of the Related Art A transfer type ink jet printer that forms an ink image on a transfer medium and then transfers the ink image to a recording medium is free from clogging of nozzles due to unintended contact between recording paper or paper dust and an ink jet recording head. And high reliability can be obtained. Such a transfer type ink jet printer is disclosed in U.S. Pat. No. 4,538,156.
The configuration described in U.S. Pat. No. 5,099,256 is known. FIG. 9 shows U.S. Pat.
It is a figure showing an apparatus of 38,156 specification.

In these ink jet printers, an ink jet recording head having a plurality of nozzles is provided on a cylindrical transfer medium with a gap therebetween. In the apparatus described in U.S. Pat. No. 4,538,156, an ink image is recorded on a recording sheet by a step of writing an ink image on a transfer medium and a transfer step of transferring the ink image onto a recording sheet. In the ink image writing process, the recording head forms an ink image on the cylinder while moving by a fixed amount per rotation in the axial direction of the transfer medium in synchronization with the rotation of the cylindrical transfer medium. The pre-recording area is scanned by a plurality of rotations of the transfer medium.
In both devices, in a transfer step, a recording paper as a recording medium is brought into contact with the transfer medium and pressed from behind to transfer an ink image onto the recording paper.

In addition to these ink jet printers, as disclosed in Japanese Patent Application Laid-Open No. 4-146469, a transfer device for pressing a toner image carried on a recording paper by a heating belt in electrophotography is disclosed. is there. FIG. 10 is a diagram showing an apparatus disclosed in Japanese Patent Application Laid-Open No. 4-146469.

[0005]

In a conventional transfer type ink jet printer, when an ink image formed on a transfer medium is transferred to a recording medium, the ink image is pressed by a pressure roller via a recording paper. Had become. However, with the above configuration, it was difficult to transfer the ink image on the transfer medium onto the recording medium without remaining the transfer.

That is, the time during which the transfer medium holding the ink image can come into contact with the recording medium is determined by the minute time during which the recording medium passes through the contact width (nip width) between the pressing roller and the transfer medium. Was limited. For this reason, it has been difficult to transfer the ink image adhering to the transfer medium onto the recording medium within the minute time, against the adhesion force. That is, greater than the adhesive force between the ink image and the transfer medium, it is difficult to allowed to generate the adhesive force and the cohesive force and the ink image and the recording sheet of the ink image, Ri ink remaining untransferred on the transfer medium, Ink image formed on recording medium
There is a problem that the quality of the product is low .

One method of solving these problems is to increase the applied pressure. In this case, however, the transfer medium is susceptible to mechanical fatigue and the life of the transfer medium is shortened. Had a point.

On the other hand, the fixing device shown in FIG. 10 does not transfer an ink image, but fixes a toner image on a recording paper, but uses a flexible belt as a pressing member. The pressing area with the coloring material, that is, the nip width is increased.

Here, also in the transfer step of the transfer type ink jet printer, the nip width can be enlarged by using a flexible member such as the belt as the pressing member. However, when the mechanism of the fixing device is applied to a transfer unit of a transfer type ink jet printer, the following problems occur. That is, in the fixing device of the electrophotography, originally, the toner image is while being担時on the recording sheet, the transcription-type inkjet recording apparatus, ink adhering a adhesive force on a transfer medium transcription on a recording sheet peeled off the image
If the pressing force per unit area is reduced by simply increasing the nip width, good transferability cannot be obtained. In the electrophotographic fixing mechanism, since the flexible member is constantly pressed, even if the flexible member is diverted to a transfer type ink jet printer, a process of rotating the transfer medium many times to form an ink image is realized. There is a problem that it is not possible.

Further, in the conventional transfer type ink jet printer, the residual ink image as a transfer leakage onto the transfer medium, it is difficult to remove recovered, even if the removal of these mechanically, the transfer medium and thus conducive to fatigue
There is a problem .

[0011] The present invention has as its purpose was made in view of such problems, without increasing the load at the time of transfer, cheap ink image formed on the transfer medium
Constant, thereby reliably rolling photographed in a recording medium, the print quality is good sign
An object of the present invention is to provide an ink jet recording apparatus capable of obtaining a printing medium . Another object of the present invention is to provide a transfer load.
As small as possible, and the ink formed on the transfer medium
Print quality by transferring the image to the recording medium stably and reliably
Ink jet recording that can obtain a good print medium
It is to propose a recording method.

[0012]

Means for Solving the Problems To achieve such a problem
In the present invention in order, a cylindrical transfer medium which rotates at a predetermined speed, and an ink jet recording head for forming an i ink image by pairs toward the transfer medium, the ink image formed on the transfer medium in the ink jet printer having a transfer means for transferring the recording medium, the transfer means,
The cylindrical transfer medium extends in parallel to the axial direction, and the circle
And the rear roller than the formation region of the ink image of the tubular transfer medium is <br/> placed downstream, between the rear-stage rollers in the rotational direction
A front roller arranged upstream with a gap,
An endless transfer film suspended between a roller and a post-stage roller; and contacting the post-stage roller with the cylindrical transfer medium.
And the front roller is separated from the transfer medium.
In the state, transfer the transfer film to the cylindrical
And a transfer pressure application mechanism that presses against the transfer media
Have been .

[0013] The ink jet recording method of the present invention comprises:
The ink recorded on the cylindrical transfer medium rotating at a predetermined speed
At a predetermined contact angle so that the downstream pressure is high.
The transfer is performed by pressing the recording medium against the cylindrical transfer medium.
Swelling .

[0014]

[Action] while extending the contact time of the Symbol recording medium and the ink image,
Recording medium to increase the pressing force just before leaving from the transfer medium
Te, then transcription to ensure the recording medium an ink image on the transfer medium
You .

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The ink jet recording apparatus of the present invention will be described in detail below with reference to embodiments.

FIG. 1 is a sectional view showing an ink jet printer according to a first embodiment of the present invention. FIGS. 2 and 3
Are perspective views viewed from opposite directions. An ink jet recording head 2, a transfer device 3 as a transfer unit, a peeling claw 4, and a cleaning device 5 are sequentially arranged around a transfer drum 1 as a transfer medium.

After an ink image for one screen is formed on the transfer medium drum 1 by the ink jet recording head 2, the recording paper 10 is conveyed to the contact area between the transfer drum 1 and the transfer device 3, The image is transferred, the recording paper 10 is separated from the transfer drum 1 by the peeling claw 4, and the recording paper 10 is discharged by a recording paper discharge unit (not shown).

The recording head 2 is an ink jet recording head of a type using a piezoelectric element, and has a plurality of (Nn) nozzles spaced at a constant interval Pn in the axial direction of the transfer drum 1. In the case of the present embodiment, the recording head 2
= 16/600 inches and Nn = 512. Head 2
Is calculated by the head moving device 21 in the direction of arrow A (the axial direction of the transfer drum 1) per rotation of the transfer drum 1.
By moving the head by (q = 1/600 inch), an ink image for one screen is formed on the transfer drum by rotating the transfer drum 16 times.

The transfer drum 1 is formed by laminating an elastic layer made of silicone rubber around a metal tube. In the case of the present embodiment, the transfer drum 1 has an outer diameter of 2 mm in thickness. Are laminated to form a diameter of 85 mm (perimeter of 267 m).
m). A4 short side 2 in the circumferential direction due to the circumferential length
A non-printing area is secured in addition to a 10-mm printing area. The elastic layer is made of silicone rubber having a rubber hardness of 40 to 60, from which the ink image is easily peeled. As the material of the elastic layer, fluorosilicone rubber, fluoro rubber, hydrogenated nitrile rubber may be used as other materials having good releasability.

As shown in the sectional view of FIG. 1, the transfer device 3 includes a front roller 31 and a rear roller 32 arranged on the upstream side and the downstream side along the outer circumference of the transfer drum 1, and these two rollers An endless transfer film 33 which is a flexible member suspended on the main side plate 30 which rotatably supports the front roller 31 and the rear roller 32, and a partial area of the transfer film 33 is pressed against the transfer drum 1 and It comprises a transfer pressure application mechanism 150 for releasing the pressure. And
The transfer pressure applying mechanism 150 presses and releases the part of the inscribed area between the transfer film 33 and the rear roller 32 to the transfer drum 1. A transfer film pressure applying mechanism 130 for pressing and releasing the part of the range not including the contact area with the transfer drum 1. Here, the pressing of the transfer film 33 against the transfer drum 1 includes the transfer film 33 pressing the transfer drum 1 indirectly via the recording paper 10.

The former roller 31 and the latter roller 32 are
A metal material such as aluminum is selected.

The transfer film 33 is a PET film.

The above-mentioned post-roller pressure applying mechanism 140
Is configured as follows. An auxiliary side plate 36 having an arm shape is rotatably supported on a support shaft 100 provided in an ink jet printer housing (not shown). Further, the rear roller 32 is rotatably supported by the sub side plate 36. A spring 141 is suspended from the sub-side plate 36, and the other end is connected to an ink-jet printer housing (not shown). Thereby, the secondary side plate 3
2 and the subsequent roller supported by the support shaft 100
Is rotated in the direction of arrow C. Here, the plunger 142 is held in the printer housing.
The movable portion of the plunger 142 is engaged with the main side plate 30 through the link mechanism 143. The plunger 14
Due to the expansion and contraction of the movable portion 2, a part of the inscribed area of the transfer film 33 with the subsequent roller 32 is pressed against and released from the transfer drum 1.

The above-described transfer film pressure applying mechanism 130
Is configured as follows. A coil spring 131 is disposed coaxially with the rotation axis of the rear roller 32, and one end of the spring presses a pin 135 set on the main side plate 30,
The other end presses a pin 136 set on the sub side plate 36. Thereby, the main side plate 30 is rotated in the direction of arrow D about the rotation axis of the rear roller 32. A plunger 132 is supported by the sub side plate 36, and a movable portion thereof is engaged with the main side plate 30 via a link mechanism 133. Here, after the latter roller 32 is rotated as described above, the main side plate 30 is rotated by extending the movable portion of the plunger 132, and the transfer film 33 is rotated.
Is pressed against the transfer drum 1 in a part of the range. Then, the movable portion of the plunger 132 is contracted, and the pressing of the rear roller 32 on the transfer drum is released, whereby the pressing of the transfer film 33 on the transfer drum 1 in a partial area is released.

FIG. 4 is a view showing a state where a partial area of the transfer film is pressing the transfer drum 1, and FIG. 5 is a view showing a state where the pressing is released. The outer peripheral length of the transfer film 33 is a length that allows the transfer film 33 to be suspended between the former roller 31 and the latter roller 32 so as to be slack. For this reason, when the transfer film 33 presses the transfer drum 1, a part of the transfer film 33, that is, from the leading end to the trailing end of the pressing range, forms an angle θ between the transfer drum 1 and the outer periphery of the transfer drum 1. Section is pressed. However, the section of the angle θ includes a section θ1 from the leading end of the pressing range to the inscribed start point of the transfer film 33 and the subsequent roller 32, and a section θ2 from the inscribed starting point to the trailing end of the pressed range.
When the radius of the transfer drum 1 is R and each section is represented by a circumference, the section Rθ1 is 30 mm, the section Rθ2 is 3 mm,
There is about a 10-fold difference between the two sections. The pressing force (load) on the section θ1 and the section θ2 can be set arbitrarily to each other, but in the present embodiment, they are approximately equal and about 0.5 kg / cm per unit length in the axial direction. In terms of the pressure application mechanism, the configuration is not particularly difficult in terms of load. Since the circumferences of the sections θ1 and θ2 are greatly different from each other, the applied pressure (load per unit area) is significantly different. That is, with the rotation of the transfer drum, in the section θ1, a low pressure is applied for a long time, and in the section θ2, a high pressure is applied for a short time as compared with the section θ1.

The transfer film transport means is formed by gears described below. A gear 32 having an outer diameter of the latter roller 32 as a pitch circle diameter is provided on the outer periphery of the end of the latter roller 32.
1 is fitted. A gear 11 having an outer diameter of the transfer drum 1 as a pitch circle diameter is also fitted to the outer periphery of the end of the transfer drum 1. When the rear roller 32 is pressed against the transfer drum 1, the two gears are engaged. At this time, of the two rollers of the rear roller 32 and the front roller 31, the driving side is:
The rear roller 32 is provided. Therefore, in the range where the transfer film 33 is pressed against the transfer drum 1, the transfer film 33
Can be transported without slack and without a speed difference between the transfer drum and the transfer drum. That is, when the recording paper 10 is conveyed to a section of θ which is a pressing range of the transfer drum 1 against the transfer film 33, the transfer film 33 and the transfer drum 1
The recording paper 10 interposed between the transfer drum 33 and the transfer drum 1 is conveyed without speed difference while being constantly pressed by the transfer film 33.

In this embodiment, as long as the normal printing operation is performed, the ink image can be transferred to the recording paper without any remaining transfer, so that the cleaning operation of the transfer drum by the cleaning means is not required.

However, if the ink jet printer is stopped due to a power failure or the like while the ink image is being written on the transfer drum 1, the transfer drum 1 needs to be initialized by cleaning when the ink jet printer returns. The cleaning device 5 shown in FIG. 1 cleans the transfer drum 1 in such an emergency. It comprises a blade 50 for scraping the remaining ink image, and a mechanism (not shown) for bringing the blade 50 into contact with and releasing the transfer drum 1.

The ink used in the present invention is obtained by dispersing a pigment together with a colloidal dispersion type resin in pure water as an ink solvent together with additives such as a surfactant. Specifically, as a pigment, carbon black dispersion liquid (carbon black solid content: 20 wt%) 15 wt%, colloidal dispersion resin (resin solid content: 40 wt%)
%) 30 wt%, triethanolamine 5 wt%, polyethylene glycol 5 wt%, surfactant 2 wt%, and an ink prepared by adding a preservative and the like several wt% as appropriate.

Next, the operation of the ink jet recording apparatus of the present invention will be described in more detail. As described above, the operation of the ink jet printer of the present invention mainly includes an image writing step of forming an ink image on the transfer drum 1 and a transfer of the ink image formed on the transfer drum 1 to a recording paper 10 as a recording medium. And two transfer steps. Hereinafter, the ink image writing step and the ink image transfer step will be described.

First, in the ink image writing step,
The pressing of the transfer film 33 and the rear roller 32 of the transfer device on the transfer drum 1 is released as shown in FIG.

As described above, the ink jet recording head 2 is moved in the axial direction of the transfer drum 1 (direction of arrow A) while rotating the transfer drum 1 in the direction of arrow B. At this time, from each nozzle of the inkjet recording head 2,
The ink droplet flies toward the transfer drum 1 on demand, and an ink image is formed over the effective image forming width of the transfer drum 1 while the transfer drum 1 rotates 16 times.

Next, the transfer step will be described. When the ink image writing process is completed, the trailing roller 32 and the transfer film 33 are synchronized with the circumferential end of the print area on the transfer drum 1 passing through the area facing the transfer film 33.
Is pressed against the transfer drum 1.

The recording paper 10 is moved so that its leading end is synchronized with the leading end (printing start position) of the printing area on the transfer drum 1.
It is guided by the contact portion between the transfer film 33 and the transfer drum 1,
It is conveyed while being pressed by the transfer drum 1 by the transfer film 33.

Here, as described above, the recording paper 10 and the ink image on the transfer drum 1 can be kept in contact with each other for a section of θ. For this reason, compared with the case where transfer is performed using one pressure roller of the related art, first, the section θ1 is used.
In this case, although the pressing force is reduced, it is possible to have a significantly longer contact time between the ink image and the recording paper 10.

One of the factors governing the force adhering between the ink image and the recording paper 10 is the phenomenon of sticking. This adhesive force is greatly affected by the degree of progress of “wetting” of the adhesive substance ink at the interface. That is, in the section θ1, the ink image in contact with the recording paper 10 is softened or melted, and by making the contact time itself long, the time margin for sufficiently promoting “wetting” between the recording paper and the ink image is provided. Obtainable.

After sufficient wetting has progressed between the recording paper 10 and the ink image in the section θ1, the recording paper 10
The latter roller 32 receives a large pressing force. In this section, the ink image is pushed between the fibers of the recording paper 10 by mechanical force, so that the connection between the ink image and the recording paper 10 is further strengthened. Further, if the recording medium is a smooth sheet material rather than paper is also the adhesion between the ink image and the recording medium is enhanced, adhesion is Ru high between the recording medium and the ink image.

Usually, the size of the circumference of the section of θ2 is a size that can be set within a range of 2 mm to 3.5 mm at most. According to the present inventor, by making the ratio of the circumference of the section between θ1 and θ2, that is, Rθ1 / Rθ2, 5 or more,
Effective wetting promotion was achieved.

The phenomenon at the moment when the ink image is transferred to the recording paper 10 is the phenomenon of peeling. That is, good transfer means that the ink image is separated from the interface of the transfer drum 10 without causing cohesive failure. In general, in peeling, whether or not cohesive failure occurs is greatly affected by the peeling speed, and the higher the peeling speed, the less the cohesive failure occurs. In the case of the present invention, in order to promote "wetting" between the ink image and the recording paper, the contact time between the ink image and the recording paper is increased. It does not reduce the peripheral speed of the drum 10. In other words, there is no contradiction to improve the adhesion between the recording paper 10 and the ink image and to secure the peeling speed to prevent the cohesive damage of the ink image.

Further, the ink image has already been formed on the transfer drum 1 before the recording paper 10 is conveyed to the transfer area. The time during which the ink image adheres to the transfer drum is sufficiently longer than the pressing time by the transfer film 33. Therefore, the force at which the ink image adheres to the transfer drum 1 is reduced by the above-described ink image and recording paper 10 Is less dependent on the amount of contact time and the magnitude of the pressing force.

Therefore, in the above configuration of the present embodiment, it is possible to increase the adhesive force between the recording paper 10 and the ink image and the cohesive force of the ink image to be higher than the adhesive force of the ink image on the transfer drum 1. Thus, the ink image can be stably transferred to the recording paper 10 without remaining the transfer on the transfer drum 1. Therefore, in the transfer step, a high-quality ink image on the transfer drum is reproduced on the recording paper 10 without deterioration. Further, the cleaning of the transfer drum 1 is not required except at the time of an emergency stop such as a power failure, so that the cleaning frequency can be reduced. In the transfer step, no excessive pressure is applied to the transfer drum 1, and the deterioration of the transfer drum 1 with time can be reduced, and the life of the transfer drum 1 can be extended.

In this embodiment, the rotation speed of the transfer drum 1 is not changed in the image forming step and the transfer step.
In each step, a different rotation speed may be used.

FIG. 6 is a sectional view showing an ink jet printer according to a second embodiment of the present invention. 7 and 8
FIG. 3 is a diagram showing a pressed state of the transfer film against the transfer drum and a released state of the transfer film in the embodiment.

The main side plate 30 contained in the transfer film 33
A different point from the first embodiment is that a rod-shaped halogen lamp 34 which is a heating means supported by a mirror and a reflecting mirror 35 which is contained in a transfer film 33 and focuses the light beam of the halogen lamp in the direction of the transfer drum. It is. The other points are the same as those of the first embodiment, and the description is omitted.

Also in this embodiment, as shown in FIG. 7, in the ink image writing step, the transfer film 3
Although the pressing of the transfer drum 1 on the transfer drum 1 is released, each of the transfer drums 3 is disposed close to each other. Here, the halogen lamp 34 contained in the transfer film 33 is turned on. Since the transfer film is a transparent PET film, when the ink image on the transfer drum 1 passes through the position facing the transfer film 33, the halogen lamp 34 and the reflecting mirror 3 are used.
5, the temperature of the ink image rises due to the radiant heat, and the evaporation of the solvent component in the ink is accelerated. As a result, an appropriate dry state of the ink image can be obtained at the start of the transfer step.

Here, the moderately dry state is a state in which water, which is a main component of the solvent in the ink, is almost evaporated, and the cohesive force of the ink image is increased compared to immediately after landing. . At the same time, the resin part, which is a binder component in the ink, is softened or melted, and the adhesive force for the ink image to adhere to the recording paper is also increasing.

In order to reduce the image output time on the recording paper, it is necessary to shift to the transfer step immediately after the step of writing the ink image on the transfer drum. However, if the drying of the ink image in the transfer step is insufficient, the ink image transferred onto the recording paper will be of low quality with bleeding. In other words, in order to output at high speed while maintaining high image quality, it is necessary to promote drying of the ink image on the transfer drum 1 and realize an appropriate drying state of the ink image within a short time before the start of the transfer process. There is. That is, in the configuration of the present invention, in the transfer step after the ink image writing step, the above-described bleeding at the time of transfer does not occur, and the output can be performed at high speed.

Also in the transfer step, the halogen lamp 34 contained in the transfer film 33 is turned on following the ink image writing step. Thereby, the recording paper 10
Is heated from the back of the recording surface. That is, recording paper 1
While 0 passes through the section θ1, the recording paper 10 is heated, so that the ink image in contact with the recording paper 10 is also heated, and the binder component in the ink is kept in a softened or melted state. I have. For this reason, the force for the ink image to adhere to the recording paper 10 is increased more than in the first embodiment.

The rear roller 32 is made of a metal material having excellent heat conductivity. Rear roller 3
The surface temperature of No. 2 is lower than the temperature of the back surface of the recording paper in the section θ1 because the surface temperature of the recording sheet is not irradiated by the halogen lamp. Therefore, when passing through the section θ2, the recording paper 10 is also cooled at the same time. That is, in the section θ2, the ink image is also cooled, and the cohesive force of the ink image is increased more than in the first embodiment.

As described above, the time during which the ink image adheres to the transfer drum 1 is sufficiently longer than the time during which the transfer film 33 is pressed. In this case, the force at which the ink image tends to adhere to the transfer drum 1 decreases as the temperature increases.

The above in this embodiment, the transfer process pressure under even high-temperature low, the step of promoting the wetting maintaining prolonged contact state, the contact time is short but high pressure while cooling the ink image Two of the applied steps are performed in succession
The configuration is such that the ink image is reliably transferred .

That is, in the present embodiment, as in the first embodiment, the adhesive force between the recording paper 10 and the ink image and the cohesive force of the ink image are determined by the force with which the ink image adheres to the transfer drum 1. The ink image can be transferred to the recording paper 10 stably without transfer residue on the transfer drum 1. Therefore, in the transfer step, a high-quality ink image on the transfer drum is reproduced on the recording paper 10 without deterioration. Further, the cleaning of the transfer drum 1 is not required except at the time of an emergency stop such as a power failure, so that the cleaning frequency can be reduced. Then, in the transfer step, the transfer drum 1
Even if an excessive pressure is not applied to the transfer drum 1, deterioration of the transfer drum 1 over time can be reduced, and the life of the transfer drum 1 can be extended.

[0053]

As described above, according to the present invention,
While extending the contact time between the recording medium and the ink image,
Immediately before the paper leaves the transfer medium,
Transfer the ink image on the medium to the recording medium without fail.
Stable transfer to recording paper without leaving ink image on drum
And a high quality printed matter can be obtained . Also, the ink image can be reliably transferred to the recording medium.
The number of cleanings of the transfer drum
Can, by eliminating the excessive application of pressure to simultaneously transfer drum, it is possible to prevent aging of the transfer drum, extending the life of the transfer drum
Can be done .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an ink jet printer according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the ink jet printer according to the first embodiment of the present invention.

FIG. 3 is a perspective view of the ink jet printer according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a state in which a transfer film is pressed against a transfer drum in the first embodiment of the present invention.

FIG. 5 is a view showing a state in which the transfer film is pressed against the transfer drum in the first embodiment of the present invention.

FIG. 6 is a cross-sectional view of an ink jet printer according to a second embodiment of the present invention.

FIG. 7 is a diagram illustrating a state in which a transfer film is pressed against a transfer drum in a second embodiment of the present invention.

FIG. 8 is a view showing a state in which the transfer film is pressed against the transfer drum in the second embodiment of the present invention.

FIG. 9 is a perspective view of a conventional inkjet printer.

FIG. 10 is a cross-sectional view of a conventional electrophotographic transfer device.

[Description of Signs] 1: transfer drum (transfer medium) 2: recording head 3: transfer device 10: recording paper (recording medium) 31: front roller 32: rear roller 33: transfer film 34: halogen lamp 150: transfer pressure application mechanism

Claims (7)

(57) [Claims] An ink jet recording head that forms an ink image facing the transfer medium; and transfers the ink image formed on the transfer medium to the recording medium. In an ink jet printer having a transfer unit, the transfer unit extends in parallel to the axial direction of the cylindrical transfer medium, and a subsequent roller disposed downstream of the ink image forming area of the cylindrical transfer medium, A front roller disposed upstream of the rear roller with a gap in the rotation direction, an endless transfer film suspended between the front roller and the rear roller, and the rear roller contacting the cylindrical transfer medium. Transfer pressure in which the transfer film is pressed against the cylindrical transfer medium via a recording medium in a state where the transfer roller is in contact with the transfer roller and the pre-stage roller is separated from the transfer medium. Inkjet printer is composed of a pressurizing mechanism. 2. The ink jet printer according to claim 1, further comprising heating means for heating a contact area of the transfer film with the cylindrical transfer medium. Wherein said transfer said cylindrical transfer the angle of contact zone with the medium θ1 of the film, the contact section of the subsequent stage roller
Angle θ2 of the radius of said cylindrical transfer medium is R
2. The ink jet printer according to claim 1 , wherein the ratio Rθ1 / Rθ2 is 5 or more. 4. An ink image recorded on a cylindrical transfer medium rotating at a predetermined speed, a contact section of a predetermined angle is maintained,
And an ink-jet recording method in which the recording medium is pressed against the cylindrical transfer medium so as to increase the pressure on the downstream side and transferred. 5. A rear roller extending parallel to the axial direction of the cylindrical transfer medium and disposed downstream of the ink image forming area of the cylindrical transfer medium; A front roller disposed upstream with a gap, an endless transfer film suspended between the front roller and the rear roller, and abutting the rear roller on the cylindrical transfer medium; and 5. The ink jet recording method according to claim 4, wherein the recording medium is pressed against the cylindrical transfer medium via a unit that presses the transfer film against the cylindrical transfer medium while being separated from the transfer medium. 6. The ink jet recording method according to claim 4, wherein a contact area of the transfer film with the cylindrical transfer medium is heated. 7. An angle of a contact section of the transfer film with the cylindrical transfer medium is θ1 , and a contact section of the rear roller is a contact section.
Angle θ2 of the radius of said cylindrical transfer medium is R
The inkjet recording method according to claim 5 , wherein the ratio Rθ1 / Rθ2 is 5 or more.