JPH06198862A - Type sheet structure in small-size printer - Google Patents

Abstract

PURPOSE:To obtain a type sheet capable of continuing a sharp printing for a long time while ensuring an elastic restoring force of a sheet part and suppressing a wear of a surface of a type part. CONSTITUTION:A type sheet is molded by a two-rubber molding machine-by using an ethylene propylene rubber for a type part 2 and a silicone rubber for a sheet part 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a type sheet structure of a small printer which is mounted on a computer terminal, a cash register, a printer used for a measuring instrument and the like and has a printing mechanism by a type sheet.

[0002]

2. Description of the Related Art In the conventional type sheet structure, the type portion and the sheet portion are made of the same material, and as shown in FIG. 5, the type sheet is pressed by the type portion 1a, the sheet portion 1b and a printing hammer (not shown). It is composed of a dowel part 1c.

When printing, the printing portion 1a supplied with ink from an ink supply source (not shown) pushes the dowel portion 1c by the pressing force of the printing hammer, so that the printing portion 1a is shown correspondingly. When the printing hammer was returned, the print portion was returned to its original position by the elastic expansion and contraction force of the sheet portion 1b.

Regarding the material of the type sheet, the type portion is required to have abrasion resistance in order to prevent abrasion due to collision or friction with the printing paper, whereas the sheet portion has a suitable elasticity. However, the materials have been selected within a range in which the required characteristics of both of them are secured to some extent.

[0005]

However, in the above-mentioned prior art, when trying to maintain the print quality for a long period of time, the wear of the print portion becomes a problem, but the main cause of promoting wear deterioration of the print portion is as follows. There is friction with the printing paper, acceleration of wear due to the adhesion of paper dust generated during printing, and deterioration of physical properties due to swelling of ink. However, there is a problem that the printing becomes unclear due to the accelerated wear.

The present invention has been made in order to solve such a drawback, and an object of the present invention is to secure the elasticity of the sheet portion while suppressing the abrasion of the surface of the character portion, and for a long time. The purpose is to provide a type sheet that can continue clear printing.

[0007]

According to the type sheet structure of a small printer of the present invention, in a type sheet having a type attached to an elastic rubber surface, the type portion and the sheet portion are made of different materials and are integrally formed. It is characterized by being.

[0008]

According to the above construction of the present invention, by using a rubber-based material having excellent abrasion resistance for the type portion and using a rubber-based material having excellent elasticity for the sheet portion, the type portion The wear-resistant material ensures the durability against the wear of the sheet, and the stretch durability against the seat portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a first explanatory view of an embodiment of the present invention and is a sectional view of a printing mechanism portion of a small type sheet printer. That is, this mechanism section includes a type sheet receiver 3 having a type sheet, a print coil 6 as a drive section for driving the print hammer 10, a print iron core 5, a first print yoke 4, a second print yoke 9, The print yoke is composed of a print suction plate 8 and a print return magnet 7.

Next, the printing operation will be described. When the printing coil 6 is energized, the printing suction plate 8 is sucked in the direction of arrow a, and the printing hammer 10 integrated with the printing suction plate works in the direction of arrow b and is not shown. The type portion 2 with ink supplied from the ink roll is pushed out toward the platen 11. The printed character portion 2 pushed out collides with the printing paper 12 and collides with the platen 11 to be printed. When the energization of the print coil 6 is completed, the print hammer 10 and the print suction plate 8 are returned in the directions of arrows c and d by the expansion and contraction force of the sheet portion 1. The print suction plate 8 returned to the standby position shown by the solid line is held at this position by the magnetic force of the print return magnet 5. In the small-sized printer having such a structure, the type portion 2 is made of ethylene propylene rubber, and the sheet portion 1 is made.
When silicone rubber is used for vulcanization molding with a two-material rubber molding machine (a device that sequentially molds two types of rubber materials in the same mold), when the type sheet structure shown in Fig. 4 is adopted, actual operation It has been confirmed that the wear resistance of the type sheet at that time is 1.5 to 2 times as much as the conventional wear amount.

FIG. 2 is a perspective view of a type sheet according to an embodiment of the present invention. That is, the character portion 2 is joined to the sheet portion 1, and the entire character portion is formed on the sheet portion as shown in the figure.

FIG. 3 is a second explanatory view of the embodiment of the present invention, in which the character portion 2 is joined to the sheet portion 1 by means such as adhesion or crosslinking / polymerization. The type portion 2 is made of a material having rubber elasticity and excellent wear resistance, and the sheet portion 1 is made of a material having rubber elasticity and repeated stretchability. ing. When a printing operation is performed on a type sheet having such a configuration, the type portion 2 that is in direct contact with the printing paper (not shown) has good abrasion resistance, and the amount of abrasion of the type portion is improved by about 1.5 times compared to the conventional type. It is confirmed to do.

FIG. 4 is a third explanatory view of the embodiment of the present invention, in which the character portion 2 is formed in a convex shape with respect to the seat portion 1. With such a shape, the adhesiveness between the character portion 2 and the sheet portion 1 is more secured as compared with FIG.
It has been confirmed that the uneven wear due to the change in the load applied to the type part 2 is reduced by 30 to 50% in comparison with the conventional amount of wear while ensuring the wear resistance of No.

FIG. 5 is an explanatory view of a conventional example, in which the character portion 1
It is composed of a, a sheet portion 1b, and a dowel portion 1c that receives a pressing force of a printing hammer, and is formed of the same rubber material.

[0015]

As described above, according to the present invention, the type sheet and the sheet portion are integrally formed by using the materials having the optimum characteristics required, respectively. There is an effect that it is improved and clear printing can be obtained for a long period of time.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a first embodiment of the present invention.

FIG. 2 is a perspective view of a type sheet according to the first embodiment of the present invention.

FIG. 3 is a partially enlarged sectional view of a type sheet according to a second embodiment of the present invention.

FIG. 4 is a partially enlarged sectional view of a type sheet according to a third embodiment of the present invention.

FIG. 5 is an enlarged sectional view showing an example of a conventional technique.

[Explanation of symbols]

 1 sheet part 2 type part 3 type sheet receiver 4 first printing yoke 5 printing iron core 6 printing coil 7 printing return magnet 8 printing suction plate 9 second printing yoke 10 printing hammer 11 platen 12 printing paper

Claims (1)

[Claims] 1. A small printer having a printing type sheet having a type on the surface of elastic rubber, wherein the type portion and the sheet portion are made of different materials and are integrally formed. Printer type sheet structure.