JPS6259671B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink jet recording device equipped with an ink supply pipe suitable for supplying ink to a flat ink jet head having a plurality of ink discharge ports.

FIG. 1 shows such a flat inkjet multihead. In the figure, 1 is the head main body, 2 is a common ink chamber, and 3 is an orifice. This inkjet multihead is extremely small.
For example, the outer dimensions are about 0.8 mm thick and 5 mm wide, and the diameter of the orifice installed in it is 40 μm.
That's about it. When feeding ink to such an ink jet head, the resistance is large and it is difficult to evenly feed ink to a large number of orifices. Conventionally, the shape of the tube 4 used to supply liquid to such a horizontally long chamber, especially a small chamber such as an inkjet head, is a perfect circle or an ellipse. Naturally, the joints of the two must also be circular. but,
As described above, when it is desired to send liquid to a horizontally elongated chamber, the conventionally shaped circular tube is inconvenient because it takes time for the liquid to spread within the common liquid chamber 3. Furthermore, when moving liquid using capillary force, the diameter of the tube must be small, so if the tube is circular as in the past, the cross-sectional area of the tube is limited, and the amount of liquid movement is minute.

The present invention is convenient for sending liquid into a horizontally long chamber in this way, and when moving liquid using capillary force, only the thickness of the tube is made small so that capillary force acts. An inkjet recording device is provided with an ink supply pipe that can have any width, increase the amount of liquid movement, and is especially suitable for supplying ink to a flat inkjet head equipped with a plurality of ink ejection ports. The ink supply pipe is characterized in that the ink supply pipe has an ink passage having a horizontally elongated cross-sectional shape substantially the same as that of the common ink chamber at the connection part with the common ink chamber.

The present invention will be explained below with reference to the drawings. FIG. 2 shows a plan view of the supply pipe according to the invention, and FIG. 3 shows a cross-sectional view. The supply pipe 5 according to the present invention shown in the illustrated embodiment is made by stacking two sheets 6, 6 having a width corresponding to the ink chamber in the ink jet head part at an appropriate interval. Both ends 7, 7
It is formed into a flat shape by sealing it with. The supply tube is made of a suitable material, such as plastic, metal, ceramic, etc., and is hollow and defines a liquid flow path 8 therein.

FIG. 4 shows a state in which the supply pipe 5 in the inkjet recording apparatus of the present invention is connected to the inkjet head 9. As shown in FIG. In the figure, 10 is a common ink chamber, 1
1 indicates the orifice. As described above, since the supply pipe 5 according to the present invention has a planar expansion, the common liquid chamber 1
0 is uniformly and instantaneously covered with ink liquid.
However, if you want to supply liquid by capillary force, you can reduce the gap in the flow path 8, but unlike conventional supply pipes, the width can be adjusted arbitrarily, so a considerable amount of liquid can be supplied by capillary force. becomes possible.

FIG. 5 shows a supply pipe according to the present invention filled with a filter 12 made of a porous material.
It is made by sandwiching a filter 12 between two sheets and sealing both ends of the filter. This filter 1
2 removes dust, foreign matter, air bubbles, etc. from the liquid and prevents it from entering the head 9.

As explained above, the present invention is suitable for sending liquid into a horizontally long ink chamber and can move a large amount of liquid using capillary force, and is particularly suitable for supplying ink to a flat ink jet head. An inkjet recording device equipped with a suitable supply pipe is provided. In the illustrated embodiment, the supply pipe of the present invention is shown as having a rectangular cross-section, but the present invention is not limited to such a rectangular cross-section, and may also have a flat elliptical shape.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an inkjet multihead using a conventional supply pipe, Fig. 2 is a plan view of the supply pipe according to the present invention, Fig. 3 is a sectional view thereof, and Fig. 4 is a main FIG. 5 is a perspective view showing the use of the supply pipe according to the invention in an inkjet multihead, and FIG. 5 is a sectional view showing the supply pipe according to the invention filled with a filter. 1: Head body, 2: Common liquid chamber, 3: Orifice, 4: Supply pipe, 5: Supply pipe, 6: Sheet, 7:
End, 8: Liquid flow path, 9: Ink jet head, 10: Common liquid chamber, 11: Orifice, 12:
filter.

Claims (1)

[Claims] 1. An ink jet recording device having an ink jet head having a plurality of ink ejection ports and a common ink chamber for distributing ink to the plurality of ink ejection ports, and an ink supply pipe for supplying ink to the head, An inkjet recording device characterized in that the supply pipe has an ink passage having a horizontally long cross-sectional shape substantially the same as that of the common ink chamber at a connecting portion with the common ink chamber.