JPS62144954A - Ink jet recorder - Google Patents

Abstract

PURPOSE:To realize sharp, high-quality recording on a general-purpose recording paper like high-grade commercial recording paper by providing a heating element for heating the recording surface of a recording medium before printing on the recording medium and a heating element for heating the recording medium and a heating element for heating the recording surface or non-recording surface of the recording medium after printing. CONSTITUTION:A heating element 4 for heating the recording surface of a recording medium 5 used is for instance, an aluminum hollow cylinder with a sheet-like sheathed heater formed around it. In the meantime, a heating element 7a which heats the recording surface of a recording medium 5 after printing on the recording medium is composed of a halogen lamp 9 providing on the recording medium is composed of a halogen lamp 9 provided near the recording medium and a reflector 10 for transmitting a radiant heat from the halogen lamp to the recording medium 5 effectively. The heating condition of the recording medium 5 is detected by temperature sensors 8a, 8b located in the neighborhood of the recording medium, and in turn, the operation of heating elements 4, 7a is controlled by a temperature control circuit so that the temperature of the recording medium 5 may be almost equivalent to a set value. In addition, the set temperature can be freely controlled by a user in accordance with paper quality.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an inkjet recording device, and more particularly to providing a heating means to promote drying and fixing of ink to improve print quality.

[Prior Art] As a conventional example of a heating method for promoting drying and fixing of printed ink and improving print quality, Japanese Patent Application Laid-Open No. 58-18
No. 8685 is mentioned. In the above example, the recording paper is preheated by a heating roller immediately before printing on the recording paper, and the paper can also be heated by contact heat transfer even after printing, and the paper is heated by the subsequent feed roller and presser roller. It is designed to be ejected. .

[Problems to be Solved by the Present Invention] However, in the prior art described above, for general-purpose recording paper such as commercially available high-quality paper, heating is performed from the non-recording side of the recording paper immediately before printing. There is a difference in the heating effect on the recording surface depending on the paper thickness, and the heating effect becomes smaller for thicker paper. Also, after printing, the recording paper is guided between the paper feed roller and the presser roller, so if unfixed ink is present, it will cause a decline in print quality, so use recording paper that is slow to dry and fix. The problem is that there are some drawbacks.

The present invention is intended to solve these problems, and its purpose is to provide an inkjet recording device that can realize clear recording of the same quality on general-purpose recording paper such as commercially available high-quality paper. There is a particular thing.

[Means for Solving the Problems] The inkjet recording apparatus of the present invention includes a heating element for heating the recording surface of the recording medium before printing on the recording medium, and a heating element for heating the recording surface of the recording medium after printing. Alternatively, it is characterized by providing a heating element that heats the non-recording surface.

[Function] According to the above configuration of the present invention, the heating element is operated during inkjet recording to preheat the recording surface of the recording medium before printing, and also to heat the recording medium after printing, thereby achieving the above purpose. Achieved.

[Embodiment] FIG. 1 is a perspective view of a main part showing an embodiment of the present invention, in which a head 1 is disposed so as to be movable on a guide shaft 2 in the direction of the guide shaft, and in the direction of arrow A. Inkjet recording is performed on the recording medium 5 that is inserted from the recording medium 5 and guided between the platen 3 and the heating element 4, and then is sent as the platen 3 rotates and is discharged in the direction of arrow B.

In the figure, reference numeral 4 denotes a heating element that heats the recording surface of the recording medium 5, which may include a halogen lamp built into the inside of a roller, or a nichrome wire heater formed on the inner surface of a hollow cylinder. However, in this embodiment, a sheet-like sheath heater (rated power: 150 W) is used around a hollow aluminum cylinder.

On the other hand, 7a is a heating element that heats the recording surface of the recording medium 5 after printing on the recording medium, and is provided near the recording medium, and in this embodiment, a halogen lamp 9 (
The halogen lamp has a rated power of 200 W) and a reflector plate 10 for effectively transmitting radiant heat from the halogen lamp to the recording medium 5.

As shown in FIG. 2, the heating state of the recording medium 5 is detected by temperature sensors 8a and 8b provided close to the recording medium, and the temperature of the recording medium 5 is approximately set by a temperature control circuit (not shown). Heating element 4.7a to the value
operation is controlled. Further, the set temperature can be freely controlled by the user according to the paper quality.

Figure 3 shows the relationship between recording medium heating temperature and ink fixing time when recording is performed on recording media a, b, and c (all commercially available high-quality paper) having different paper thicknesses using the inkjet recording apparatus of the present invention, and Figure 4 shows the relationship between recording medium heating temperature and ink fixing time. 2 shows the relationship between the recording medium heating temperature and the dot diameter after fixing. Note that the dot diameter after fixing includes uneven bleeding in the direction of paper fibers. As can be seen from the figure, the higher the recording medium temperature, the shorter the ink fixation time, and the dot diameter converges to a nearly constant value, so that clear recording of the same quality can be achieved regardless of the quality of the recording paper. It is possible.

FIG. 5(a) is a schematic configuration diagram showing another embodiment of the present invention, in which a heating element 7b is provided at a position in contact with the recording medium to heat the non-recording surface of the recording medium. This is what I did. Here, as the heating element 7b, for example, a cylindrical one like the above-mentioned heating element 4 can be used, but it is not limited to this. It may be configured with a flat heating element 7C having a length substantially equal to the width.

In the above embodiment, a heating element 4 that uses contact heat transfer is used to preheat the recording medium, but the heating element 4 is not limited to this. It may also be one that uses heat.

Furthermore, it is obvious that the recording apparatus of the present invention is capable of both monochromatic recording and color recording.

[Effects of the Invention] As described above, according to the present invention, a heating element that heats the recording surface of the recording medium before printing on the recording medium, and a heating element that heats the recording surface of the recording medium after printing on the recording medium, Alternatively, by providing a heating element that heats the non-recording surface and operating the heating element during inkjet recording to promote drying and fixation of the ink, clear recording of the same quality can be achieved on general-purpose recording media such as commercially available high-quality paper. This has the effect of making it possible.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the main parts showing one embodiment of the present invention, and FIG.
The figure is a schematic sectional view of FIG. 1 showing the position of the temperature sensor. FIG. 3 is a graph showing the relationship between recording medium heating temperature and ink fixing time. FIG. 4 is a graph showing the relationship between recording medium heating temperature and dot diameter after fixing. FIGS. 5(a) and 5(b) are schematic configuration diagrams showing other embodiments of the present invention. 1...Head 2...Guide shaft 3...Platen 4...Heating element 5...Recording medium 6...Paper press guide 7a, b, c...Heating element 8a, b...・Temperature sensor Figure 1 Figure 4

Claims (1)

[Claims] In an inkjet recording device that ejects ink from a nozzle to form characters or images on a recording medium, a heating element heats the recording surface of the recording medium before printing on the recording medium, and a heating element heats the recording surface of the recording medium after printing on the recording medium. An inkjet recording apparatus characterized in that an inkjet recording apparatus is provided with a heating element that heats a recording surface or a non-recording surface of the recording medium.