JPH02251451A - Ink jet printer equipped with ink fixing processor - Google Patents

Abstract

PURPOSE:To prevent an ink liquid from bleeding by training neither growing larger of a printer nor decrease of printing quality by a method wherein an ink absorbing extruder and a heat roller around which an ink absorbing coated recording medium is wound are provided. CONSTITUTION:A recording medium 11 from a sending out part is wound around a heat roll 5, a feed roll 6, and a platen roll 2, and is carried to a heat part. An ink absorbent 8 to be extruded from a slit nozzle 72 of an ink absorbent extruder 7 is uniformly applied on a recording surface. An ink absorbent 8 is dried by heat of a heat roll 5, and an ink absorbing layer 9 is formed on the recording surface of the recording medium 11. An ink liquid to be discharged from an ink nozzle 31 of a printing head 3 is stuck to the ink absorbing layer 9 to perform printing. Since the ink absorbing layer 9 is formed on the recording medium 11, this procedure can apply to all recording media. Further, since it does not require hot blast, drying of the ink nozzle 31 is not striking, and printing quality is not decreased. Since there is no horizontal feed mechanism, this processor does not larger in size.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an inkjet printer that performs recording by ejecting and depositing ink on a recording medium such as paper or film.

(Prior art) In an inkjet printer, as shown in FIG. 4, surface leveling is performed and the recording medium 1
The distance between the recording surface and the head surface of the ink nozzle 31 of the print head 3 is kept constant. And ink nozzle 3
1, ink liquid is ejected onto the recording surface of the recording medium 1, and the ink liquid adheres to the recording medium 1, whereby characters or images are recorded.

The above-mentioned ink liquid is one in which dyes and pigments are dissolved or dispersed in water or an organic solvent.On the other hand, plain paper used as a recording medium is usually subjected to size processing. It has water-repellent properties, and the film is usually
Has water repellent properties. For this reason, the fixability of the ink liquid to the recording medium (the absorption of the ink liquid by the recording medium) is poor, and the ink liquid bleeds or flows onto the recording medium. This is noticeable when recording is performed by superimposing three or four types of ink liquids on a recording medium.

Therefore, conventional methods for improving the above-mentioned bleeding and flowing phenomena (ink liquid absorption and fixing properties) include (1) recording media such as treated paper and treated film, which are coated with an ink absorbing layer on paper or film in advance; (2) The printer is equipped with a mechanism that holds the recording medium horizontally after recording until the ink liquid is fixed; (3) The fixing speed is accelerated by blowing hot air onto the recording surface of the recording medium after recording. Ta.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional technology, in the case of (1), only expensive treated paper and treated film can be used as recording media, resulting in high running costs and postcards, etc. In the case of (2), a horizontal feeding mechanism is required, which makes the entire printer larger, and in the case of (3), hot air blows into the ink nozzles of the print head. This may occur, and as a result, there is a problem that the ink nozzle becomes noticeably dry and the printing quality deteriorates.

The present invention has been made in view of the above-mentioned problems, and prevents the phenomenon of ink bleeding and flow without increasing the size of the printer as a whole or degrading print quality, and without requiring high running costs. An object of the present invention is to provide an inkjet printer equipped with an ink fixing processing device that can perform the following steps.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an inkjet printer, which includes an elongated slit nozzle containing an ink absorbent, and a nozzle opening of the slit nozzle.
The apparatus includes: an ink absorbent extruder disposed so as to face the recording surface of the recording medium being conveyed; and a heat roll around which the recording medium coated with the ink absorbent by the ink absorbent extruder is wound.

[Effect]

In the present invention configured as described above, when the recording medium is conveyed, the ink absorbent extruded from the slit nozzle of the ink absorbent extruder is uniformly applied to the recording surface, and The ink absorbent dries, an ink absorbing layer is formed on the recording medium, and recording is performed on the ink absorbing layer of the recording medium.

(Example) Next, an example of the present invention will be described with reference to the drawings.

The inkjet printer equipped with the ink fixing device of this embodiment is an improved version of the conventional inkjet printer, and the differences between them will be explained.

As shown in FIGS. 1 and 2, a beat roll 5 is disposed parallel to the platen roll 2 on the opposite side of the platen roll 2 from the side where the print head 3 is located. The feed roll 6 is arranged parallel to the heat roll 5 so that its roll surface contacts the roll surface of the beat roll 5.

On the other hand, the ink absorbent pusher 7 consists of a hollow cylindrical tank 7I that accommodates the ink absorbent 8, and a long slit nozzle 7□ that communicates with the tank 71, and a nozzle opening of the slit nozzle 7□. is disposed parallel to and above the beat roll 5 so as to face the roll surface of the heat roll 5. The above-mentioned tank 7 has a torque roll 73 inside.
is accommodated, and as the feed roll 6 rotates, the torque roll 73 also rotates, pressure is applied in the tank 71, and a constant flow of ink absorbent 8 is pushed out from the slit nozzle 7□. There is. These beat rolls 5 and feed rolls 6 are connected to the drive means of the printer (not shown) via a drive mechanism (not shown) and rotate synchronously, and their rotation directions are as shown by the arrows in FIG. , right and left, respectively.

Next, the operation of this embodiment will be explained.

The recording medium II from a delivery section (not shown) is wound around a heat roll 5, a feed roll 6, and a platen roll 2, and is conveyed to a head section where a print head 3 is located as shown in FIG. The ink absorbent 8 extruded from the slit nozzle 72 of the ink absorbent extruder 7 is uniformly applied to the recording surface. Then, the ink absorbent 8 is dried by the heat of the heat roll 5, and the recording medium 1
An ink absorbing layer 9 is formed on the recording surface of . The recording medium II on which the ink absorption layer 9 is formed is sent to the head section,
Ink liquid ejected from the ink nozzles 3□ of the print head 3 adheres to the ink absorption layer 9, and recording is performed.

As described above, according to this embodiment, the recording medium I before recording
Since it has an ink fixation processing device that forms the ink absorbing layer 9 on I, it can be used with all types of recording media such as postcards, the running cost is not high, and hot air is not required, so the drying process of the ink nozzle 3 is easily controlled. is not noticeable and print quality does not deteriorate. Furthermore, since it does not have a horizontal feeding mechanism, the printer as a whole does not become large.

The above-mentioned ink absorbent 8 is preferably made of starch or polyvinyl alcohol with a low degree of carbon bias, and it is even more preferable to add an inorganic pigment such as silica or titanium oxide.

FIG. 3 is a perspective view of essential parts of a second embodiment of the present invention.

In this embodiment, the slit nozzle 72 is provided with a sliding edge controller 10 that is movable in the direction of arrow A, and the ejection width of the ink absorbent 8 from the slit nozzle 72 is variable according to the width of the recording medium 12. It is now possible to do so. Furthermore, above the beat roll 5, four feed rolls 11 are placed in contact with the roll end surface of the beat roll 5.
1 to 114 are arranged so that small recording media such as postcards can be easily sent.

(Effects of the Invention) Since the present invention is configured as described above, there is no need for a horizontal feeding mechanism, and the progress of drying of the ink nozzle is not noticeable, resulting in an increase in the size of the entire printer and a decrease in print quality. Furthermore, the running cost is not high, and the phenomenon of ink liquid bleeding or flowing can be prevented.

[Brief explanation of drawings]

FIG. 1 is a side view of a main part of a first embodiment of an inkjet printer equipped with an ink fixing device of the present invention, FIG. 2 is an enlarged perspective view of the main part of FIG. 1, and FIG. FIG. 4 is a perspective view of the main parts of the second embodiment, and FIG. 4 is a side view of the main parts of a conventional inkjet printer. 1. 12... Recording medium, 2... Platen roll,
3...Print head, 3I-ink nozzle, 4
... Presser plate, 5 ... Heat roll, 6
...Feed roll, 7...Ink absorbent extruder,
7,... ink tank, 72... slit nozzle, 73... torque roll, 8... ink absorbent, 9... ink absorbing layer, IO... sliding edge controller, 11+,
lit, 113.114...Feed roll.

Claims (1)

[Claims] 1. An inkjet printer, comprising an elongated slit nozzle (7_2) containing an ink absorbent (8), and a nozzle of the slit nozzle (7_2). The aperture is connected to the recording medium being transported (
an ink absorbent pusher (7) arranged to face the recording surface of the recording medium (1_1, 1_2), and an ink absorbent pusher (7) applied to the recording medium (1_1); , 1_2) is wound around a heat roll (5).