JPH01133747A - Liquid jet recording head - Google Patents

Abstract

PURPOSE:To facilitate the positioning and mounting/detachment of a filter, by engaging a filter member with the supply port of a common liquid chamber in such a state that the recessed part for a liquid sump of said filter member is projected toward the common liquid chamber from the supply port and holding the same from above in a liquidtight state by an elastic member. CONSTITUTION:A filter 12 is directly engaged with the supply port 6 of a common liquid chamber 5. The filter 12 is formed into a stepped dish-shape and the bottom surface thereof is directly exposed to the common liquid chamber 5. An elastic seal member 13 for holding the filter 12 to a liquidtight state covers the flange part 12B of the engaged filter 12 from above and an L-shaped supply pipe 7 is engaged with the socket part 13A of said member 13. At the time of the replacement of the filter 12, since ink containing much dust is received by the recessed part 12A of the filter 12, even when the filter 12 is detached, there is no anxiety such that the ink flows in the common liquid chamber 5. The setting of the filter 12 is extremely easy and the labor at the time of manufacturing can be omitted and a degree of freedom from the aspect of the planning of the shape of the filter is obtained and the compactness of a mount part can be achieved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid jet recording head, and more specifically, the present invention relates to a liquid jet recording head, and more specifically, a recording head that jets recording liquid to form flying droplets and makes the droplets impact a recording material. The present invention relates to a liquid jet recording head that performs recording.

[Prior Art] FIG. 3 shows an example of a conventional recording head of this type. Here, 1 is a recording head, 2 is an ejection port provided at the tip of the liquid path 3, and 4 is provided in the liquid path 3, and generates energy to eject the recording liquid in the wave path from the ejection port 2. It is a means of generating energy for 5 is a common liquid chamber communicating with each liquid path 3, and the common liquid chamber 5 has a recording liquid supply port 6.
is provided, and an L-shaped supply pipe 7 is connected to the supply port 6, or 8 is a filter housing interposed at the connection part. Also, 9 is the filter housing 8
This is a filter held in

That is, in this example, the grooves 91 to 8 of the filter housing 8 are connected to the recording liquid supply port 6 provided at the upper part of the common liquid chamber 5.
In addition to fitting A into the filter housing 8, the end of the supply pipe 7 was also fitted into the filter housing 8, and the fitted periphery was bonded with an adhesive 10.

[Problems to be solved by the invention] However, in the conventional liquid jet recording head, the filter is disposed between the liquid chamber supply port and the supply pipe via the filter housing. In order to
When you try to replace the filter, it tends to drip into the socket of the filter housing together with dirt or recording liquid, which is undesirable as the dirt gets mixed into the common liquid chamber. Cleaning and managing the housing was not easy, and it was also an obstacle to making this part more compact.

SUMMARY OF THE INVENTION An object of the present invention is to focus on the above-mentioned conventional problems, and to solve the problems, it is an object of the present invention to provide a liquid jet recording head in which the filter can be easily attached and removed, and dirt can be removed easily, and dirt does not get mixed into the common liquid chamber. be.

Means for Solving Problem E] In order to achieve the above object, the present invention includes a common liquid chamber communicating with a plurality of liquid channels, and records a liquid from a supply pipe to a supply port of the common liquid chamber via a filter. A liquid jet recording head capable of supplying liquid is characterized in that a recess is formed in the center of the filter, and the outer periphery of the recess is held in a state fitted to a supply port.

[Function] According to the present invention, the filter member is fitted with the recess for the liquid reservoir protruding from the supply port toward the common liquid chamber side, and is held liquid-tight by an elastic member from above. Therefore, it is easy to position and remove the filter, and even when the filter is removed, the recording liquid containing dirt remains in the liquid reservoir, so there is no possibility of it dripping into the common liquid chamber. It's fleeting.

[Examples] Examples of the present invention will be described below in detail and specifically based on the drawings.

FIG. 1 shows an embodiment of the invention. The liquid jet recording head 11 of this example is configured such that the filter 12 is directly fitted into the supply port 6 of the common liquid chamber 5. That is, since the ink supply port 6 in this type of common liquid chamber 5 has a diameter of, for example, about 4 m/m, the diameter of the part into which the filter 12 is fitted must be large enough to fit into it. It is preferable to use a somewhat smaller diameter, for example, about 3.8 m/m. However, it goes without saying that the selection between these dimensions will be on a case-by-case basis.

Therefore, the filter 12 is formed into a stepped dish shape suitable for the above-mentioned fitting configuration, such as a round dish shape as shown in FIG. 2A, or an angular dish shape as shown in FIG. 2B. It is shaped like a dish, and its recess 128 is made to protrude downward so that its bottom surface is directly exposed to the common liquid chamber 5 side. In addition, as shown in FIG. 2B, the square plate shape and the groove can be firmly positioned in a state in which the filter itself is fitted and prevented from rotating.

Reference numeral 13 denotes an elastic sealing member for keeping the filter 12 liquid-tight by covering the fitted filter 120 flange 12B from above, and an L-shaped supply pipe is connected to the socket 138 of the elastic sealing member 13. 7 is fitted. In this case, a spring force is applied from the upper part of the supply pipe 7 by a spring member (not shown) so that the supply pipe 7 is not pulled out from the socket portion 138.

In the liquid jet recording head 11 configured in this manner, ink supplied to the common liquid chamber 5 via the supply pipe 7 is filtered by the filter 12, thereby preventing clogging when ink is ejected from the ejection ports 2. Moreover, since the filter 12 itself is kept in a sufficiently liquid-tight state by the firmly positioned elastic member, there is no risk of ink leakage, and when the filter 12 is replaced, the concave portion 12A of the filter 12 will receive the ink with a lot of dirt. Since the liquid can be stopped, there is no fear that it will flow into the common liquid chamber 5 even if it is removed. In addition, the filter 12 is extremely easy to set, which saves time and effort during production. It also provides flexibility in designing the shape of the filter, and allows for a more compact design. [Effects of the Invention] As explained above, according to the present invention, a recess is formed in the center of the filter, and the recess is held in a state where the recess is fitted into the recording liquid supply port of the common liquid chamber. Since the concave part is made to protrude from the supply port toward the common liquid chamber, positioning the filter is easy, and when replacing the filter, there is no possibility of dirt entering the common liquid chamber along with the recording liquid.
In addition, since the filter is kept liquid-tight with the supply pipe through the elastic liquid-tight part, there is no need to glue it together each time it is replaced, which contributes to labor savings. can.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of the configuration of a liquid jet recording head according to the present invention, and FIGS. 2A and 2B are two views of a filter according to the present invention.
FIG. 3 is a sectional view showing an example of the structure of a conventional liquid jet recording spatula 1. 1.11...recording spatula 1~. 2...Discharge port, 3...7 night passage, 4...Energy generating means, 5...Common liquid chamber, 6...AJ support 110. 7... Supply pipe, 12... Filter, 12A... Recessed part, 12B... Collar part, 13... Elastic stopper cavity, 138... Socket part.

Claims (1)

[Scope of Claims] A liquid jet recording head comprising a common liquid chamber communicating with a plurality of liquid paths, and recording liquid can be supplied from a supply pipe to a supply port of the common liquid chamber via a filter, comprising: 1. A liquid jet recording head, characterized in that a recess is formed in the center of the filter, and the outer periphery of the recess is held in a state fitted to the supply port.