JPH0220356A - Current recording device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a current-carrying recording device used in, for example, facsimiles, printers, copying machines, and the like.

Conventional technology When printing images, characters, etc. by applying current-carrying phenomena, we generally use sheets with a three-layer structure in which a coloring material is applied to the surface of the base material and a resistive layer is applied to the back surface, or dot reproduction. In order to improve the performance, a four-layer structure sheet is used in which a conductive layer of metal is provided between the three-layer structure sheet and the resistive layer by vacuum deposition or the like.

Further, there are conventional energization recording apparatuses such as those shown in FIGS. 3 to 4, for example. This has a resistive ribbon 3 and a transfer ribbon 6, which is a support ribbon 4 coated with a dye 5, interposed between a recording paper 1 and an energized recording head 2.

Problems to be Solved by the Invention However, since the three-layer structure sheet described above does not have a conductive layer, it suffers from poor dot reproducibility, cannot achieve high resolution, and cannot obtain high-quality images or characters. Ta. Furthermore, although the four-layer structure sheet has excellent dot reproducibility, the manufacturing process of the sheet is complicated and expensive, and the running cost increases. In the configuration shown in FIGS. 3 and 4, a current flows between the two electrodes of the current-carrying recording head 2, and a dot is formed between the electrodes, directly under one electrode, or directly under both electrodes. Since the current flows through the resistive layer in the horizontal direction with respect to the resistive ribbon 3, heat generation occurs even in areas that are not directly involved in dot formation, resulting in a problem of poor dot reproducibility and the unclearness of the heat generating area. If the design takes into account the spread of the dots due to the size of the dots, there is a problem that the resolution actually decreases.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide an energization recording device that achieves faithful dot reproducibility and low running costs while inheriting high speed and high energy efficiency.

Means for Solving the Problems In order to solve the above problems, the present invention provides a heat generating sheet with a multilayer structure in which a conductive layer is formed on a resistance layer, and a heat generating sheet in a two-layer structure formed by coating a coloring material on a base material. A color material sheet is placed between the recording paper and the current-carrying recording head, and a resistive layer is placed from the side of the current-carrying recording head.
A circulation device is provided in which a conductive layer, a base material, and a coloring material layer are sandwiched in the order E, and the heating sheet is circulated while being in contact with the coloring material sheet only between an energized recording head and a recording paper. The coloring material sheet is provided with a conveying device that sends out the coloring material sheet together with the recording paper.

Effect With the above configuration, when printing images or characters, the coloring material sheet is brought into close contact with the current-carrying recording head via the heat-generating sheet by applying pressure against the recording paper to the current-carrying recording head. Then, by passing a current from the electrode of the current-carrying recording head into the resistance layer provided on the side of the heating sheet that contacts the current-carrying recording head, the heat-generating sheet itself generates heat, and this heat is transmitted to the color material sheet that is in close contact with it. Then, the coloring material on the coloring material sheet is transferred to the recording paper. At this time, Joule heat is concentrated only in the resistance layer existing in a very narrow space between the conductive layer directly below the current-carrying recording head and the current-carrying printhead, and heat generation occurs efficiently. In addition, since the heat-generating sheet immediately separates from the coloring material sheet after generating heat directly under the energized recording head, transfer does not occur on the coloring material sheet other than directly under the energized recording head.
Dot reproducibility is improved.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. 1 and 2, a recording paper 11, a color material sheet 12, and a heat generating sheet 13 are interposed between a platen 14 and an energized recording head 15, and the rotation of the platen 14 causes the recording paper 11 to contain color material. It is designed to be sent out together with the sheet 12. Then, the color material sheet 12 is made of a base material 16.
The recording paper 11 is coated with a color material layer 17 to form a two-layer structure, and the color material layer 17 is placed in contact with the recording paper 11 . Further, the heat generating sheet 13 has a multilayer structure with a conductive layer 19 formed on the resistance layer 18, and is arranged so that the conductive layer 19 can be brought into contact with the base material 16. The color material sheet 12 is guided by a peeling roller 20 and arranged to be separated from the recording paper 11, and the heat generating sheet 13 is formed in an endless shape, and is connected to a pair of pinch rollers 21, a guide roller 22, and an energized recording sheet. It is expanded into an annular shape by the head 15. Further, the guide roller 22 is provided so as to be biased and movable in the A direction.
An appropriate tension is always applied to the heat generating sheet 13 by the movement of the heat generating sheet 13. The energized recording head 15 is provided so as to approach and separate from the platen 14i.
When approaching, the color material sheet 12 is pressed against the recording paper 11 via the heat generating sheet 13. In addition, the heat generating sheet 13 is connected between the capsta 23 and the pinch roller 21.
The capstan 230
The heat generating sheet 13 is circulated by rotational driving. The energized recording head 15 and the capstan 23 are connected to a head drive timing generation circuit 24, and according to instructions from the head drive timing generation circuit 24, the energized recording head 15 moves in and out and the capstan 23
3° drive is controlled.

The effects of the above configuration will be explained below.

First, when paper is fed to the recording start position and when no recording is performed, the energized recording head 15 moves in the input direction, and the heat generating sheet 13 and the color material sheet 12 are separated. At this time, the heat generating sheet 1 is given an appropriate tension by the guide roller 22.
3 is in contact with the energized recording head 15 without slack.

During recording, both the energized recording head 15 and the guide roller 22 move in the +rB direction, and the coloring material sheet 12
and the recording paper 11 are sandwiched between the energized recording head 15 and the platen 14 via the heat generating sheet 13, and the heat generating sheet 13, the color material sheet 12 and the recording paper 11 are inserted into the energized recording head 15 by the pressure of the energized recording head 15. and the platen 14. Then, by passing a current through the resistance layer 18 of the heat generating sheet 13 from the electrode of the current-carrying recording head 15, the heat generating sheet 13 itself generates heat, and this heat is transmitted to the coloring material sheet 12 in close contact with the coloring material sheet 12. The color material layer 17 is transferred onto the recording paper 111. At this time, a current E flows directly under the electrode of the current-carrying recording head 15 as shown in FIG.
E-cojoule heat is concentrated only in the resistance layer 18, which exists in a very narrow space between the electrodes, and heat generation occurs efficiently. Thereafter, the recording paper 11 and the color material sheet 12 are fed at a constant speed in the C direction, and the heat generating sheet 13 is rotated in the D direction at the same speed. Therefore, after the heat generating sheet 13 generates heat directly under the energized recording head 15, the coloring material sheet 13 immediately
Since the dot is separated from the energized recording head 15, transfer does not occur on the color material sheet 12 other than directly under the current-carrying recording head 15, and dot reproducibility is improved. Furthermore, since the heat generating sheet 13 is circulated and used repeatedly many times, running costs can be reduced.

Effects of the Invention As described above, according to the present invention, by bringing the heat-generating sheet and the coloring material sheet into close contact only between the energized recording head and the recording paper, transfer is possible on the coloring material sheet other than directly under the energized recording head. This prevents the occurrence of dot reproducibility.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention, FIG. 2 is a current path diagram during recording in the configuration of FIG. 1, FIG. 3 is an overall configuration diagram of a conventional current-carrying recording device, The figure is a current path diagram during recording in the configuration of FIG. 3. 11...Recording paper, 12...Color material sheet, 13...
Heat generating sheet, 15... Current recording head, 16... Base material, 17-... Coloring material layer, 18... Resistance layer, 19...
conductive layer.

Claims (1)

[Claims] 1. A multilayer heating sheet with a conductive layer formed on a resistive layer and a two-layer coloring material sheet formed by applying a coloring material to a base material are energized between a recording paper and an energized recording head. A resistive layer, a conductive layer, a base material, and a coloring material layer are sandwiched in this order from the recording head side, and the heating sheet is brought into contact with the coloring material sheet only between the energized recording head and the recording paper. An energized recording device that is equipped with a circulation device that circulates the coloring material sheet, and a conveyance device that sends out the coloring material sheet together with the recording paper.