JPH0615837A - Ink jet head cartridge - Google Patents

Abstract

PURPOSE:To provide an ink jet head cartridge capable of proventing the leakage of ink to the outside of an ink case from a atmosphere communication hole through the boundary of the inner wall surface of the ink case and a porous material. CONSTITUTION:An ink jet head cartridge contains an ink receiving member 1 having a porous material 3 impregnated with ink received therein, the atomsphere communication hole 10 provided so as to pierce the wall surface of the ink receiving member 1 and the projection parts 11 pressing the porous material 3 so as not to bring the porous material 3 into contact with the atmosphere communication hole 10 and provided to the inner wall surface of the ink receiving member 1 in the vicinity of the atmosphere communication hole 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet head cartridge, and more particularly to an ink jet head cartridge for an ink jet printer.

[0002]

2. Description of the Related Art FIGS. 4 (a) and 4 (b) are sectional views of an ink case for a general ink jet head cartridge.

In FIGS. 4 (a) and 4 (b), 1 is an ink case.
Reference numerals 2, 6 are air communication holes, 3 is a porous material, and 4 is an ink discharge hole connected to the head.

In the case of FIG. 4 (a), the porous material 3 is filled inside the ink case 1 for holding the ink, and air is introduced from the outside of the ink case 1 as the ink is consumed. For this purpose, the atmosphere communication hole 2 is formed in the wall surface of the ink case 1.

[0005]

Problems to be Solved by the Invention In FIG. 4 (a),
In general, it is preferable that the porous material 3 inside the ink case 1 is brought into close contact with the inner wall surface of the ink case from the viewpoint of ink leakage, but in the vicinity of the air communication hole 2, the porous material 3 contacts the air communication hole 2. Since the ink is transmitted through the boundary between the inner wall surface and the porous material 3 due to the capillary phenomenon, the vicinity of the atmosphere communication hole 2 is in a wet state, and the ink is caused by a slight shock or vibration of the ink case 1. There is a possibility of leakage to the outside of the space 1.

In FIG. 4 (b), although the exposure due to the capillary phenomenon can be avoided, the atmosphere communication hole 6 is provided at a position projecting from the ink case 1, and not only the appearance is impaired but also the print head is integrally scanned. In this case, the space cannot be effectively used.

The object of the present invention is to prevent the ink in the ink case from leaking to the outside of the ink case from the atmosphere communicating hole along the boundary between the inner wall surface of the ink case and the porous material. An object of the present invention is to provide an inkjet head cartridge which can effectively utilize the space in the cartridge.

[0008]

According to the present invention, there is provided an ink receiving member containing a porous material impregnated with ink therein, and an atmosphere communicating hole provided through a wall surface of the ink receiving member.
The porous material presses the porous material so that the porous material does not come into contact with the atmosphere communicating hole, and includes a protrusion provided on the inner wall surface of the ink receiving member near the atmosphere communicating hole.

[0009]

The protrusion is provided on the inner wall surface of the ink receiving member near the atmosphere communication hole and presses the porous material so that the porous material does not come into contact with the atmosphere communication hole. Since it can be formed integrally with the case, it is possible to simplify the structure of the ink case and prevent leakage of ink from the atmosphere communication hole. Further, since the ink case can be provided in the inkjet head cartridge, the space in the cartridge can be effectively used.

[0010]

1 is a view showing the shape of an ink case of an embodiment of an ink jet head cartridge according to the present invention, FIG. 2 is a sectional view showing an atmosphere communication hole provided in the ink case, and FIG. 3 is an ink jet. It is a figure which shows the outline of a printer.

1 and 2, 1 is an ink receiving member,
That is, the ink case 3, 3 is a porous material, 10 is an atmosphere communication hole, 11 is the inside of the ink case 1 and is the atmosphere communication hole 1
A protrusion provided in the vicinity of 0 so that its tip is in contact with the porous material 3, 12 is provided in the protrusion 11, and a cavity 13 is provided.
It is a notch that serves as an escape path for the air when the air inside expands due to temperature rise.

The porous material 3 impregnated with ink is not in contact with the atmosphere communicating hole 10 and travels along the boundary between the inner wall surface of the ink case and the porous material 3 to leak the ink from the atmosphere communicating hole 10 to the outside. You can avoid that. Further, in the portion 14 of the porous material 3 which is compressed by the tip of the projection 11 provided around the atmosphere communication hole 10, the fibers are denser (finer) than the other portions, and the ink is retained. The higher strength helps prevent ink leakage.

Incidentally, FIG. 3 is a schematic view of an ink jet printer including the ink case 1 and the print head 15.

[0014]

The projection is provided on the inner wall surface of the ink receiving member near the atmosphere communicating hole and presses the porous material so that the porous material does not come into contact with the atmosphere communicating hole. Since it can be formed integrally with the ink case, the structure of the ink case can be simplified and the leakage of ink from the atmosphere communication hole can be prevented. Further, since the ink case can be provided in the inkjet head cartridge, the space in the cartridge can be effectively used.

[Brief description of drawings]

FIG. 1 is a diagram showing the shape of an ink case of an embodiment of an inkjet head cartridge of the present invention.

FIG. 2 is a cross-sectional view showing an ink case atmosphere communication hole.

FIG. 3 is a schematic diagram of an inkjet printer.

FIG. 4 is a diagram showing a shape of an ink case of a general inkjet head cartridge.

[Explanation of reference symbols] 1 ink case 3 porous material 10 atmosphere communication hole 11 protrusion 12 notch

Claims (1)

[Claims] 1. An ink receiving member containing a porous material impregnated with ink inside, an air communication hole formed through a wall surface of the ink receiving member, and the porous material having the air communication hole. An ink jet head cartridge comprising: a protrusion provided on the inner wall surface of the ink receiving member in the vicinity of the atmosphere communicating hole, the protrusion pressing the porous material so as not to come into contact with the ink.