JPS62144977A - Ink jet recorder - Google Patents

Abstract

PURPOSE:To enable a recording paper to be taken out in a flat state, by a method wherein a curl of the recording paper generated when preheating or heating the recording paper is smoothed out by a roller or a recording paper guide provided at a recording paper feeding part. CONSTITUTION:A fixed platen 1 is provided with a heat generating element 12 on the back side thereof not facing a recording head 5. A recording paper 3 is brought into sliding contact with the platen 1 heated by the element 12, whereby it is preheated or heated before, during and after ink jet recording, through contact heat transfer. When the recording paper is heated and dried, the paper 3 is curled in conformity with the shape of the platen 1 due to the heat. To smooth out this curl, a curl-smoothing roller 14 for curving the paper 3 in a direction opposite to the direction of the curl after the ink jet recording is provided at a recording paper feeding part. With this construction, the curl of the recording paper can be smoothed out by the curl-smoothing means, and the paper can be taken out in a flat state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inkjet recording apparatus having a means for heating and drying recording ink.

[Prior Art] A representative example of an inkjet recording apparatus having a means for heating and drying recording ink is disclosed in Japanese Patent Application Laid-open No. 55-69464 and 55.
-84670, which heats the entire platen with a heating element installed inside the platen to heat the recording paper from the back side, drying the recording ink and eliminating unnecessary bleeding and paper wrinkles.
This is an extremely effective means for preventing stains caused by unfixed ink.

[Problems to be Solved by the Invention] However, in the conventional example described above, since the recording paper is heated in the platen section, the recording paper curls along the platen shape, and even when the recording paper is ejected after inkjet recording, There is a drawback that the recording paper remains curled and cannot be removed in a flat state.

[Means for Solving the Problems] The present invention solves these problems by preheating and heating the recording paper before and after inkjet recording, thereby accelerating the drying of the recording ink, and It is characterized by having a function of removing it using a roller or a recording paper guide provided in the recording paper transport section.

[Function] According to the present invention, good inkjet recording can be performed on general-purpose recording paper such as commercially available high-quality paper by the recording ink heating drying means, and the recording paper curl removal means can remove curls caused by preheating and heating the recording paper. This removes the curls and allows the recording paper to be taken out in a flat state.

[Embodiment] FIG. 1 is a schematic overall configuration diagram showing an embodiment of an inkjet recording apparatus of the present invention.

The recording head 5 is guided by a carriage guide 6 and moves in the direction of the arrow 2, and performs inkjet recording on the recording paper 3 which is fed by intermittent line feeds in synchronization with the recording head 5 by the paper feed roller 2 and the guide roller 4. The recording head 5 is provided with a plurality of ink ejection ports 13 as shown in FIG. 2, which is a partial side view of FIG. It is formed on top. The recording head 5 of this example has nine ink ejection ports in a vertical row with a pitch of 0.635 mm, and ejects ink droplets with a diameter of about 120 IJm. The ink material used is an aqueous ink whose main components are 10 to 20% glycerin and 1 to 2% dye dissolved in water.

The fixed platen 1 is suitably made of a material with good heat wave resistance such as aluminum alloy or thermally conductive plastic material, and in this example, an aluminum alloy plate with an average plate thickness of 1 mm and a size of approximately 250 mm x 30+ nm is used. . A heating element 12 is provided on the back surface of the fixed platen 1 that does not face the recording head 5, as shown in FIG. For the heating element 12, five POSISTORs with a rated voltage of 30V and an average resistance value of 22Ω are arranged evenly, or 100V
A sheath heater of about 250W is suitable.

In FIG. 2, the recording paper 3 is in sliding contact with the fixed platen 1 heated by the heating element 12, and is preheated and heated by contact heat transfer before and after inkjet recording, rapidly drying the recording ink recorded by the inkjet recording. To obtain good printing quality by preventing unnecessary bleeding, paper wrinkles, and stains caused by unfixed ink. The paper presser 7 prevents the recording paper 3 from floating and also brings the recording paper 3 into close contact with the fixed platen 1 to enhance the heat conduction effect.

When the recording paper is heated and dried, the recording paper 3 curls along the shape of the fixed platen 1 due to the heat. In order to remove this curl, the recording paper 3 is wound around a curl removal roller 14 after inkjet recording, and the curl is removed by curling it in the opposite direction to the curl direction, and the recording paper 3 is taken out in a flat state. be able to. Another method is to provide a recording paper guide 15 bent into an arc shape or a similar shape as shown in FIG. The same effect can also be obtained by arranging the curl in the opposite direction to the curl direction and removing the curl. Furthermore, as shown in FIG.
An auxiliary roller 16 is provided on the outer periphery of the recording paper 3, and by moving the auxiliary roller 16 in the direction of the arrow (■), the amount of wrapping of the recording paper 3 around the curl removal roller 14 can be arbitrarily changed, and the paper quality and heating settings of the recording paper 3 can be adjusted. The amount of curl removal can be changed depending on the difference in curl caused by differences in temperature and the like. It is more effective to perform the above curl removal operation while the recording paper still has residual heat from drying the recording ink, or to heat the curl removal roller or the recording paper guide.

In this example, when inkjet recording was performed using various commercially available high-quality papers of different sizes as the recording paper at a heating temperature of 100 to 130°C, good image recording was achieved regardless of the paper quality, and the recording ink dried sufficiently. There were no paper wrinkles or stains due to unfixed ink.

In addition, the curling of the recording paper, which conventionally occurs, can be removed by the curl removing means, and the recording paper can be taken out in a flat state.

Although this example is a monochrome inkjet recording device, it is obvious that the present invention can also be applied to a color inkjet recording device.

[Effects of the Invention] As described above, according to the inkjet recording device of the present invention, good inkjet recording can be achieved on general-purpose recording paper such as commercially available high-quality paper regardless of the paper quality, and the recording paper can be taken out without curling. I can do it.

[Brief Description of Drawings] FIG. 1 is a schematic overall configuration diagram showing an embodiment of an inkjet recording apparatus of the present invention. FIG. 2 is a partial side view of FIG. 1. FIGS. 3 and 4 are partial side views showing other embodiments of the present invention.

4...Guide roller 6... Carriage guide 8...Paper feed gear that's all

Claims (1)

[Claims] It has a function of accelerating the drying of the recording ink by preheating and heating the recording paper before and after inkjet recording, and is provided in the recording paper transport section to prevent curling of the recording paper caused by the preheating and heating of the recording paper. An inkjet recording device characterized in that it has a function of removing ink with a roller or a recording paper guide.