JPH05555A - Ink application roller - Google Patents

Abstract

PURPOSE:To obtain an ink application roller which is compact, long-lived and capable of applying a correct ink amount by providing an ink storage groove on the external peripheral surface of an ink roller shaft. CONSTITUTION:An ink roller body 1 is pressed against a type 4. Therefore, if a type drum rotates in an arrow B direction under an external drive force, the ink roller body 1 rotates in synchronization with the rotation of the type drum in an arrow C direction. In this case, ink is applied to the type 4 from the surface of the ink roller body 1. On the other hand, ink by which fine pores of ink roller body 1 are impregnated and ink charged in a cavity formed between the ink roller body 1 and the groove 2a of an ink roller shaft 2 ooze out on the surface of the ink roller body 1 by capillarity, as the fine pores of the ink roller body 1 are mutually connected together. Thus a fixed amount of ink is constantly present on the surface of 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 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-57-10008.
9 is known, and its outline is shown in FIG. 4 of the present specification. The performance required for the ink application roller is long ink life, small size, and proper amount of ink applied to the printing type. To increase the ink life of this type of ink application roller. In this method, the volume of the ink roller body 9 is increased or the diameter of the pores of the ink roller body 9 is increased to increase the amount of ink impregnated.

[0003]

However, in the case of increasing the ink life in the above-mentioned prior art, the method of increasing the volume of the ink roller body 9 makes the entire ink applying roller large, which is a market demand. It was difficult to downsize the printer.

On the other hand, in the method of increasing the diameter of the pores of the ink roller body 9, the amount of impregnated ink can be increased without enlarging the size of the entire ink application roller. Since it becomes easy to move, the amount of ink consumed also increases, and as a result, the life of the ink cannot be expected to increase significantly. In addition, there is also a drawback that the amount of ink applied to the printed characters becomes too large and the print quality deteriorates. The present invention has been made to solve such drawbacks, and an object of the present invention is to provide an ink application roller that is small in size, has a long ink life, and has an appropriate ink application amount.

[0005]

The ink applying roller of the present invention is characterized in that a groove for storing ink is provided on the outer peripheral surface of the ink roller shaft.

[0006]

According to the above-mentioned structure of the present invention, a hollow portion is formed between the ink roller shaft and the ink roller body, and ink is stored in this portion, so that the ink impregnation amount is increased accordingly.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan sectional view of a printer using an ink applying roller of the present invention. FIG. 2 is a side sectional view of a printer using the ink application roller of the present invention. In the figure, reference numeral 1 denotes an ink roller body, which is made of a material such as rubber having a plurality of continuous fine pores, and ink is impregnated in the pores. An ink roller shaft 2 penetrates the ink roller body 1. Further, the outer peripheral surface has a groove 2a. Groove 2 of ink roller body 1 and ink roller shaft 2
Ink is filled in the cavity formed between a and a.
Since the groove 2a does not penetrate to both ends of the ink roller shaft 2 and ends inside the end surface of the ink roller body 1, the filled ink does not flow out. 5
Is a type drum provided with a type 4 on the outer circumference, and is supported by a type shaft 6. The ink roller shaft 2 is biased in the direction of arrow A by a spring force or the like, whereby the ink roller body 1 is always pressed against the type 4 with a constant force. Reference numeral 7 is a printing paper, and characters are printed by pressing the typeface 4 to which ink is applied by some method. In this embodiment, a description of how the type 4 is pressed against the printing paper 7 will be omitted.

The ink application roller having the above-described structure is of type 4 type.
The operation of applying ink to the ink will be described. Ink roller body 1
Is pressed against the type 4, so that when the type drum 5 receives a driving force from the outside and rotates in the direction of arrow B, it rotates in the direction of arrow C in synchronization therewith. At this time, the ink roller body 1
The ink on the surface of is printed on the type 4. On the other hand, since the fine pores of the ink roller body 1 are connected to each other, the ink impregnated in the pores and the ink roller body 1
The ink filled in the cavity formed between the ink roller shaft 2 and the groove 2a of the ink roller shaft 2 oozes out to the surface of the ink roller body 1 due to the capillary phenomenon. Then, a constant amount of ink always exists on the surface of the ink roller body 1. Therefore, if the amount of ink impregnated in the entire ink application roller including the cavity is increased, the ink life can be extended. In the embodiment, the groove 2a is provided on the ink roller shaft 2,
By filling ink in the cavities created by this, it becomes possible to retain a much larger amount of ink than in the conventional case, and thus the ink life is significantly improved compared to the conventional case. Further, there is no need to upsize the ink roller body 1.

By the way, the amount of ink present on the surface of the ink roller body 1 is in direct proportion to the amount of ink applied to the type 4, and if this amount is too large, ink bleeding occurs on the printed characters. If it is too small, the printed characters will be light. As described above, the amount of ink present on the surface of the ink roller body 1 is closely related to print quality, and it is required for the ink application roller to keep this amount to an appropriate amount. This is nothing but keeping the effect of the capillarity in an appropriate amount, and specifically, it becomes possible by setting the size of the pores to an appropriate value. That is, the size of the pores is ideally determined from the viewpoint of print quality.

In this embodiment, since the amount of ink impregnation can be secured by the groove 2a provided in the ink roller shaft 2, the size of the pores can be set to an appropriate value from the viewpoint of printing quality being important. Therefore, in comparison with the conventional method in which the diameter of the pores is increased to increase the amount of ink impregnated, thereby improving the ink life, the printing quality and the ink life are greatly improved.

FIG. 3 is a plan sectional view showing another embodiment of the ink applying roller of the present invention. Groove 3a of ink roller shaft 3
Penetrates to the end surface of the ink roller shaft 3, and the outflow of the ink filled therein is prevented by the adhesive 8 applied across the ink roller shaft 3 and the ink roller body 1. Oil or the like may be applied instead of the adhesive agent 8, or members having the same effect may be fixed to both ends of the ink roller shaft 3. According to this embodiment, since the mold of the groove 3a can be slid in the axial direction when the ink roller shaft 3 is molded, the parts can be easily manufactured.

[0012]

As described above, according to the present invention, a groove is provided in the outer peripheral portion of the ink roller shaft, and ink is filled in the cavity formed between the ink roller shaft and the ink roller body. Therefore, without increasing the size of the ink roller,
Alternatively, the ink impregnation amount can be increased without increasing the diameter of the pores of the ink roller body. Therefore,
It is possible to provide an ink application roller that is small in size, has a long ink life, and has an appropriate ink application amount.

[Brief description of drawings]

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

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

FIG. 3 is a plan sectional view showing another embodiment of the ink applying roller of the present invention.

FIG. 4 is a plan sectional view of a printer using a conventional ink application roller.

[Explanation of symbols]

 1 ... Ink roller body 2, 3 ... Ink roller shaft

Claims (1)

Claim: What is claimed is: 1. An ink roller body having a plurality of fine pores, wherein the pores are impregnated with ink, and an ink roller shaft penetrating and supporting the ink roller body. An ink application roller for applying ink, wherein a groove for storing ink is provided on an outer peripheral surface of the ink roller shaft.