JPH058495A - Manufacture of ink application roller - Google Patents

Abstract

PURPOSE:To prevent an applied ink from becoming insufficient and ink from becoming contaminated as well as making it possible to process a small diametral part easily by making the outer peripheral surface of an ink roller shaft uneven and manufacturing the ink roller shaft and an ink roller body using an outsert molding technique. CONSTITUTION:An ink roller shaft 2 is made of metal and runs penetrating through an ink roller body. The outer peripheral surface 2a of the shaft 2 is fluted and uneven. The shaft 2 is set in die for outsert molding and then is molded using an injection molding and a compression molding technique. A part 1c which comes in contact with the ink roller body 1 is allowed to flow into each part of an uneven flute 2a and become solid in an uneven form under a heated and vulcanized state. Thus the coefficient of contact friction between the ink roller body 1 and the outer peripheral surface 2a of the ink roll shaft 2 is high, so that no slippage occurs between the ink roller body 1 and the ink roller shaft 2, if an abnormal external force works on the ink roller body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an ink application roller for applying ink to a character or the like of a character type printer.

[0002]

2. Description of the Related Art A conventional ink applying roller of this type and a printer using the same are disclosed in JP-A-60-14157.
9 and more specifically those shown in FIGS. 6 and 7 of the present specification were known. In this type of apparatus, in FIG. 7, the characters 6a and 6b and the large diameter portion 1 of the ink roller body 1 are used.
The positional accuracy in the axial direction with respect to a is secured, and the type 6a and the large diameter portion 1
It is a necessary condition to prevent the insufficient application of ink or the color mixture of inks so that the letter a surely comes into contact with the letter a and the character 6b never comes into contact with the large diameter portion 1a.

[0003]

However, in the above-mentioned prior art, the positional relationship between the shaft 7 of the printing drum 5 and the ink roller shaft 4 can be ensured with accuracy through the contact member 8.
Since the surface 4a of the ink roller shaft 4 is flat, slippage is likely to occur between the ink roller shaft 4 and the ink roller body 1, and when slippage occurs in the axial direction, the characters 6a and 6b and the ink roller body 1 eventually result. The positional relationship in the axial direction with the large diameter portion 1a of 1 will be out of order. Therefore, the contact between the character 6a and the large-diameter portion 1a becomes incomplete, or the character 6b and the large-diameter portion 1a come into contact with each other, resulting in a very serious defect that ink color mixing or insufficient ink application occurs. there were.

Further, in the manufacture of this type of ink application roller, it is general that the ink roller body 1 is processed straight to the size of the large diameter portion 1a and the small diameter portion 1b is formed by a processing method such as grinding or cutting. Is. During the process of processing the small diameter portion 1b, the ink roller shaft and the ink roller body 1 are likely to slip in the axial direction, and when the slip occurs, the ink roller body 1
However, there is a problem that the above-mentioned color mixing and insufficient ink application occur as a result. further,
If slippage occurs in the rotation direction, the ink roller body 1 runs idle, which makes it impossible to process the small diameter portion 1b itself.

The present invention has been made to solve such a drawback, and prevents the ink roller shaft and the ink roller body from slipping in the axial direction and the rotation direction, resulting in insufficient application of ink and ink. The object is to prevent color mixing of the above and facilitate processing of the small diameter portion.

[0006]

An ink applying roller of the present invention has an ink roller body having a plurality of fine pores and having a large diameter portion and a small diameter portion alternately arranged side by side. In the ink application roller having an ink roller shaft that penetrates and supports the ink roller shaft, the outer peripheral surface of the ink roller shaft is uneven, and the ink roller shaft and the ink roller body are manufactured by outsert molding.

[0007]

According to the above construction of the present invention, the unevenness of the surface of the ink roller shaft prevents the ink roller body from slipping, and the contact surface between the ink roller shaft and the ink roller is completely adhered.

[0008]

1 is a sectional view of an ink applying roller according to an embodiment of the present invention, and FIG. 2 is a side view of FIG. Figure 3
FIG. 4 is an enlarged detailed view of FIG. 1, and FIG. 4 is a cross-sectional view of a single ink roller shaft before outsert molding. An ink roller body 1 is made of a material such as rubber having a plurality of fine pores and is impregnated with ink. The outer peripheral portion of the ink roller body 1 has a shape in which large-diameter portions 1a and small-diameter portions 1b are alternately arranged side by side. As in the conventional example shown in FIG. However, the character 6b and the small diameter portion 1b are not in contact with each other. Therefore, the ink with which the ink roller body 1 is impregnated is applied only to the character type 6a and not to the character type 6b. JP-A-60-14
As shown in 1579, another ink roller body having a shape in which the positions of the large diameter portion and the small diameter portion are exchanged is provided, and each ink roller body is impregnated with ink of a different color, so that every other digit of the type is printed. Different colors of ink can be applied alternately to the two-color printer. An ink roller shaft 2 is made of metal and penetrates the ink roller body. Outer peripheral surface 2 that contacts the ink roller body 1
Groove processing is applied to a and has an uneven shape as shown in FIGS. By setting the ink roller shaft 2 of FIG. 2 in an outsert molding die and molding by using the injection molding and compression molding methods, the ink roller body 1 is formed in each of the concave and convex groove portions of 2a in FIG. Ink roller body 1 in which the contacting portion flows in like 1c, is heated and vulcanized, and solidifies in a concavo-convex shape
The coefficient of contact friction between the ink roller shaft and the outer peripheral surface 2a of the ink roller shaft becomes large, and even when an abnormal external force acts on the ink roller member 1, no slippage occurs between the ink roller member 1 and the ink roller shaft 2. Therefore, even when the large diameter portions 1a and 1b of the ink roller body 1 are cut, the positional accuracy in the axial direction can be stably ensured. The ink roll shaft may be made of a plastic material, and the molding method may be an extrusion molding method.

The uneven shape of the outer peripheral portion of the ink roller shaft has a similar effect even when the knurling and groove processing are used in combination as shown in 3a and 3b in FIG.

[0010]

As described above, according to the present invention, even when an abnormal external force is applied to the ink roller body, the holding force does not work between the ink roller body and the ink roller shaft, so that slipping does not occur. The positional accuracy in the axial direction between the large diameter portion of the ink roller body and the printed characters can be stably ensured.

Further, since the adhesive for adhering is unnecessary, the actual volume of the ink roller body increases, the ink impregnation amount increases, and the printing life also increases.

Therefore, in a printer using an ink application roller, clear printing quality and ink life can be increased, and the practical effect is extremely large.

[Brief description of drawings]

FIG. 1 is a sectional view of an ink application roller of the present invention.

FIG. 2 is a side view of the ink application roller of the present invention.

FIG. 3 is an enlarged detailed view of an ink application roller of the present invention.

FIG. 4 is a cross-sectional view of an example of an ink roller shaft used in the ink application roller of the present invention.

FIG. 5 is a sectional view of an ink application roller shaft according to another embodiment of the present invention.

FIG. 6 is a sectional view of an ink application roller showing an example of a conventional technique.

FIG. 7 is a cross-sectional view of a printer using an ink application roller showing an example of a conventional technique.

[Explanation of symbols]

 1 Ink roller body 1a Large diameter portion of ink roller body 1b Small diameter portion of ink roller body 1c Groove contact portion with ink roller shaft 2 Ink roller shaft 2a Ink roller shaft groove portion 3 Adhesive by conventional fixing method

Claims (1)

Claim: What is claimed is: 1. An ink roller body having a plurality of fine pores, wherein a large diameter portion and a small diameter portion are alternately arranged in parallel, and an ink penetrating and supporting the ink roller body. An ink application roller having a roller shaft, wherein the ink roller shaft has an uneven outer peripheral surface, and the ink roller shaft and the ink roller body are manufactured by outsert molding. .