JPS62144955A - Ink jet recorder - Google Patents

Abstract

PURPOSE:To realize high-quality, sharp recording on a recording medium having at least a dual structure such as general-purpose recording paper like commercial high-grade paper or envelope by providing a heating element for heating both sides of a recording medium before printing on 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 3 heats the non-recording surface of a recording medium 5 and a heating element 4 heats the recording surface. The heating elements used 3, 4 are hollow aluminium cylinders with a sheet-like sheathed heaters formed around the former, for instance, and heats the recording medium by contact heat transfer. In the meantime, a heating element 7a which heats the recording surface of the recording medium 5 after printing on the recording medium is provided near the recording medium, so that a radiant heat from a halogen lamp 9 is effectively transmitted to the recording medium 5. The heating condition of the recording medium 5 is detected by a temperature sensor 8a, 8b, and the operation of the heating elements 3, 4, 7 is controlled by a temperature control circuit so that the temperature of the recording medium 5 may reach almost a set value.

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 of the recording surface depending on the paper thickness, and the heating effect will be less for thick paper, and the heating effect will be insufficient even when using a recording medium with at least a double structure, such as an envelope. I can't get it.

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. has its drawbacks.

Furthermore, when performing high-speed inkjet recording, there is a problem in that preheating and heating are insufficient, which tends to lead to deterioration in print quality.

The present invention is intended to solve these problems, and its purpose is to provide recording media of the same quality, such as general-purpose recording paper such as commercially available high-quality paper, and recording media with at least a double layer structure, such as envelopes. Infusiera allows you to record clear records!・Providing recording devices.

[Means for Solving the Problems] The inkjet recording apparatus of the present invention includes a heating element for heating both sides of the recording medium before printing on the recording medium, a recording surface of the recording medium after printing, 'or a heating element is provided to heat the non-recording surface.

[Function] According to the above configuration of the present invention, by operating the heating element during inkjet recording and preheating both sides of the recording medium before recording, the recorded ink is quickly dried and fixed, and the printed ink is The above object is achieved by heating the recording medium afterwards to further promote ink fixation.

[Embodiment] FIG. 1 is a perspective view of the main part showing an embodiment of the present invention, in which a head 1 is arranged so as to be movable on a guide shaft 2 in the direction of the guide shaft, and in the direction of the arrow. Inkjet recording is performed on a recording medium 5 which is inserted between a heating element 3 and a heating element 4 which also serve as paper conveying rollers, and is then fed by a paper feeding roller 11 and discharged in the direction of arrow B.

In the figure, numeral 3 is a heating element that heats the non-recording surface of the recording medium 5, and numeral 4 is a heating element that heats the recording surface of the recording medium 5, and is a roller with a halogen lamp built into it, and an inner surface of a hollow cylinder. In this example, a sheet-shaped sheath heater (rated power: 150 W) is formed around a hollow aluminum cylinder, and the recording medium is heated by contact heat transfer. 5 is being heated. In addition, the heating element 3 and the heating element 4
can be rotated by a motor drive system (not shown), and also serves as a roller for conveying the recording medium 5.

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 elements 3, 4.
The operation of 7a is controlled. Further, the set temperature can be freely controlled by the user according to the paper quality.

Figure 3 shows the recording medium heating temperature and ink fixing time when recording is performed using the inkjet recording apparatus of the present invention on recording media a, b, and c (a s b is commercially available high-quality paper, and C is a commercially available envelope) with different paper thicknesses. FIG. 4 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. 5a 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,
The non-recording surface of the recording medium is heated. Here, as the heating element 7b, for example, the heating element 4
Although it is possible to use a cylindrical heating element as shown in FIG. 5, it is not limited to this. As shown in Fig. may be configured.

In the above embodiment, heat generating elements 3 and 4 that utilize contact heat transfer are used to preheat the recording medium, but the present invention is not limited to this.1. It may also be a method that utilizes non-contact heat transfer, such as one that uses radiant heat by light radiation or hot air.

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, the heating element heats both sides of the recording medium before printing on the recording medium, and 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 the drying and fixing of the ink, it is possible to print on general-purpose recording media such as commercially available high-quality paper, envelopes, etc. with at least a double structure. This has the effect that it is possible to realize clear recording of the same quality for recording media with .

[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. 5a and 5b are schematic configuration diagrams showing other embodiments of the present invention. 3.4, 7a, b, c --- Heating element 5...Recording medium 8 a, b...Temperature sensor 9...Halogen lamp 10...Reflector plate 11...Paper feed roller and above Figure 1 (5e0 1! to Shukishu tIa place Ryūyu Figure 3 Figure 4 (mountain) <b> 51!I

Claims (1)

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