JPS62248664A - Electrothermal printing head - Google Patents

Abstract

PURPOSE:To enable electrodes to make satisfactory close contact with recessed and projected parts of a recording surface in individual compatibility with the recessed and projected parts, by a construction wherein a plastic film, an adhesive and a rubber layer which support the electrodes are split between the adjacent electrodes. CONSTITUTION:Electrodes 6 are supported by a plastic film 1, an adhesive 2 and a rubber layer 4, for connection to wiring parts. A groove 7 is provided at a central part of the support members between each adjacent pair of the electrodes 6, thereby splitting the support members while maintaining connection thereof with other parts so that basic performance thereof is maintained. With this construction, even where a smooth recording paper 8 having recessed and projected parts 15, 16 in a considerable degree is used, close contact between the electrodes 6 and a ribbon 9 and between the ribbon 9 and the recording paper 8 can be constantly secured by the functions of the separate and independent parts of the film 1, the adhesive 2 and the rubber layer 3. Namely, the electrodes 6a, 6b corresponding to the recessed parts 15 adjacent to the projected part 16 can easily make contact with the recessed parts 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a structure that improves the adhesion between a head of an electric printer and a ribbon, and between the ribbon and recording paper. In other words, it is a head compatible with smooth paper.

In an energized printer, the printing ribbon itself is made into an appropriate resistor, and a current is passed through the resistor in a very small area corresponding to the position to be printed, causing it to generate heat, melting the ink applied to that area and printing on the paper. It is a type of transfer.

[Conventional technology]

Currently commercialized energized printer heads are
As shown in the figure, a head 10 is arranged opposite to a recording paper 8 mounted on the outer periphery of a platen 11 at an angle of θ degrees (for example, 45 degrees). A ribbon 9 is placed between the head 10 and the recording paper 8.
is attached and is transported by the transport means 12 in the direction of arrow 13 at a predetermined speed corresponding to the printing speed.

At the tip of the head 10, as shown in an enlarged view of FIG. 4 when viewed from the direction of the arrow 14, a plurality of electrodes 6.about.6... are arranged in parallel in the vertical direction. Each electrode 6 is coated with the adhesive 2 or the rubber layer 4 to some extent to provide the unevenness 15 of the recording paper 8, in order to maintain adhesion with the ribbon and between the ribbon and the paper.
It is supported softly to accommodate the size of 16. For example, when there is a convex portion 16 on the recording paper 8 as shown in FIG. 5, the electrode 6 is pressed and the adhesive 2 and rubber layer 4 absorb it as a cushion. Conversely, the concave part 1 on the recording paper 8
In the case of No. 5, the adhesive 2 and the rubber layer 4 were extended and the adhesion of the electrode was maintained.

[Problem that the invention seeks to solve]

With this conventional structure, it was possible to handle very small curvatures, but as shown in Figure 5, if you try to print on something more than smooth paper, which was possible until now, it will cause missing dots. In addition, the dot pitch was small, meaning that the higher the letter quality, the lower the ability to handle smooth paper. That is, the convex portion 16 in FIG.
The electrodes 6a and 6b corresponding to the recesses 15 on both sides of the recording paper 8 do not contact the recording paper 8.

[Means to solve the problem]

In order to solve the above problem, the plastic film 1, adhesive 2, and rubber layer 4 supporting the electrode 6 were separated between adjacent electrode parts.

[Effect]

According to the present invention, the above-mentioned means allows for complete vertical movement to correspond to the unevenness of the recording paper, without being influenced by adjacent electrodes.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show one embodiment of the present invention, and are equivalent views to FIGS. 4 and 5.

The electrode 6 is supported by a plastic film 1 and an adhesive 2 for connection to wiring parts and the like.

It is also supported by the rubber layer 4. A groove 17 is cut in the center between these electrodes, and the connections with other parts are maintained so that the basic performance is not lost.

〔Effect of the invention〕

According to the present invention, as described above, even when the smooth recording paper 8 has considerable irregularities, the adhesion between the electrode 6 and the ribbon 7, and between the ribbon 7 and the recording paper 8 can be always separated using the independent plastic film 1 and the adhesive. 2. The rubber layer 3 is able to hold it. That is, the electrodes 6a and 6b corresponding to the concave portions 15 adjacent to the convex portions 16 come into contact with each other more easily than in the conventional case.

[Brief explanation of drawings]

Fig. 1 is a partially enlarged perspective view of a head according to an embodiment of the present invention, and Fig. 2 shows how the electrodes touch the recording paper through the ribbon of the conventional head. Fig. 2 A-A The partial sectional view, FIG. 3, shows an electrically powered printer. FIG. 5 is a view corresponding to FIG. 2, and shows how the head according to the embodiment of the present invention contacts the recording paper through the ribbon. 1 is a plastic film, 2 is an adhesive, 3 is also a plastic film, 4 is a rubber layer, 5 is a plastic body, 6 is an electrode, 7 is a slit, 8 is a recording paper, and 10 is a head.

Claims (1)

[Claims] In electrical printers, in order to improve the adhesion between the head and the ribbon, and between the ribbon and the recording paper, plastic films, adhesives, An energized printer head characterized by a structure in which the rubber layer is separated between adjacent electrode parts.