JPS60147346A - Ink jet recording apparatus - Google Patents

Abstract

PURPOSE:To attain cost reduction by simplifying the structures of a printing head and a connector, by integrating a partition wall comprising an elastic substance, which pierces a needle like tube for supplying ink to the common ink chamber of the printing head, with a flexible plate provided to the opening part of the common ink chamber. CONSTITUTION:The same number of piezoelectric converters 104 as nozzles are provided to the side surface of a side plate 102 so as to correspond to pressure chambers and the opening part 105 of a common ink chamber for respectively distributing and supplying inks to the pressure chambers is provided to said side plate 102. In this case, a flexible plate 107 and a partition wall 108 are adhered by an adhesive or welded or integrated by integral molding. In order to easily absorb the back pressure wave of ink by the deformation of each pressure chamber at the time of the injection of ink from a jet orifice 103, a thin wall part 110 formed so as to be made thinner than the other region is provided to the flexible plate 107. Because the partition wall and the flexible plate are integrated, the number of parts are reduced to enable the achievement of cost reduction, and processing and assembling become easy and the leakage of ink is prevented still more.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application] The present invention relates to an inkjet recording device, and more particularly to an inkjet recording device with an improved head and an ink connector connected thereto.

[Prior Art J] Conventional inkjet recording devices have been used in conjunction with recording devices such as computer skewers, word processors, or facsimile machines, and have low noise and quick recording speeds of 'Oj'.
In he, there are some similarities, such as the fact that the mud layer in the first act is unnecessary.

In such an inkjet recording device, the improved sieve 1 is 11d54-3.
There is an on-demand type ink sheet recording device disclosed in Japanese Patent No. 5936 Nr2. Since this on-demand ink sheet recording device is a type that ejects ink by changing the volume of the power chamber in response to an electrical signal, it does not require a system to collect unnecessary ink. As a result, less ink is consumed, and the device itself can be inexpensive.

Or is it because multiple channels can be mounted on one print head? It has the characteristics of being able to obtain ib'psm power and high-speed printing performance, and furthermore, it is easy to print in color, and has recently come to be used as a prize.

However, even in an inkjet recording apparatus with such performance, there are still problems that need to be improved.

The above-mentioned problems will be explained below with reference to FIGS. 1, 2 and 3, taking a known on-demand inkjet recording apparatus as an example. In FIGS. 1 and 2, 1 indicates a plurality of nozzles, 2 indicates a plurality of pressure chambers communicating with the nozzles, and 3 indicates a common ink chamber that distributes and supplies ink to the pressure chambers 2. 4 is a head substrate which is closely bonded to the head side plate 5, and includes the nozzle 1, pressure chamber 2 and common ink plate 3.
A groove is formed on one surface of the side plate 5 to form a groove.

Reference numeral 6 denotes a pressure tlL conversion element, which is adhesively fixed to the outer garment surface of the substrate 4 corresponding to the pressure chamber 2, and is connected to the electronic pulse generator 1].
It is connected to the. This piezoelectric conversion system 6 is connected to the generator l.
] When an electric signal is received from the pressure chamber 2, the pressure chamber 2 is suddenly pressed, and the pressed pressure chamber 2 is
The ink is ejected in small droplets from the nozzle corresponding to the nozzle. Further, a portion of the side plate 5 corresponding to the common ink chamber 3 is opened, and a flexible film 7 made of polypropylene, polyethylene, or polyvinylidene chloride is adhered to the opening, and a flexible film 7 made of polypropylene, polyethylene, or polyvinylidene chloride is adhered to the wall surface of the ink chamber 3. It is intended to form part of the This hJa! When the ink is ejected by the first rigidity of the piezoelectric conversion system 6, the membrane 7 is @uX so as to be able to absorb the return pressure of the ink due to a pressure fluctuation of 2, that is, such a multi-nozzle. In this type of print head, the pressure waves generated in the pressure chamber 2 of one channel are transferred to another channel via the common ink chamber 3.
This causes a so-called channel eraser interaction that spreads to the pressure chamber of the common ink chamber 3 and deteriorates the jet flight of ink droplets of another channel.
At the same time, it absorbs the energy of the pressure waves and prevents the collapse of the tunnel.

However, this flexible film 7 is extremely thin with a thickness of 0.02 to 0.1°C and easily peels off, and in cases where the print head is made of ceramic, special treatment such as using a shishin coupling agent is required. However, there were still problems such as the adhesion was opaque, accompanied by ink leakage, and the formation of the flexible film 7 was troublesome.

Next, an ink connector 40 is attached to the side plate 5 of the print head.
, filter 9 and ink supply pipe 8 to supply ink L to the common ink chamber 2.

FIG. 3 is a diagram showing details of the ink connector 40.
5 is the side plate of the print head mentioned above, 20 is the female contact part of the ink connector 40 fixed to the side plate 5 so as to communicate with the pressure chamber 2 of the printing head, and the bridge has a layer removed on the side of the female contact part. Ink connector 4θ fitted and connected to NO.
The female contact part 1 is a cylindrical case 21 with both ends open on the female contact part side, and a filter is inserted in the case 21 so as to face one of the open ends, and is used to drain ink. n and a sleeve fitted inside the case 21 so as to press the filter η toward one open end, and a sleeve fitted into the stepped part of the sleeve to prevent ink leakage and air intrusion. The partition wall made of rubber or the like, the inner ring fitted in the case 21, the sleeve, and the partition wall are pressed against one opening 31M side and integrated with the other inside the case 21. Open end 11! IK placed spacer 25Q! It is composed of Note that an annular engagement th26 may be provided on the outer periphery of the case 21. On the other hand, on the male contact part side, the female contact part 5l11
7) Case 21 K is fitted with a one-bottom cylindrical case 31,
A needle tube 32 for supplying ink, which is arranged so as to penetrate through the paper section of the Kusu 310, and an at-state tube 32 are attached to the case 3.
The case 31 (c) includes a holder 33 and the like provided at the bottom of the case 31 (c) so as to be firmly attached to the case 31 (c). In addition, case 31
A protrusion is provided on the inner peripheral surface of the female contact portion 2o to fit into an engagement groove 2b provided on the outer periphery of the case 21 of the female contact portion 2o. The female contact part side is fixed to the print head 10 with one open end of the case 21 communicating with the ink flow path of the ink head to, and the male contact part side is removably fitted to the female contact part side. Connected. When the male contact part is connected to the female contact part side, the needle tube 3
2 penetrates the partition wall 24 as shown by the broken line to print the print head I.
When the male contact part side is removed from the female contact part 2I), the negative passage hole of the partition wall 240 by the needle tube 32K is blocked by its elasticity, preventing ink leakage and air. Intrusion can be prevented.

However, when the connector 40 is configured in this manner, the partition wall row, which is worn out and damaged each time the female contact section side and the male contact section side are attached and detached, is built into the female contact section 20 fixed to the 111j plate 5. Another problem is that it is extremely difficult to replace.

[Purpose of the invention]

Non-invention was made to solve the above problems,
The purpose is to simplify the structure of the print head and connector and reduce costs by integrating the bulkhead and flexible plate of the ink connector, and preferably by eliminating the need for attachment and detachment.
It also makes it easier to replace easily damaged parts and further prevents ink leakage.

[Structure of the invention]

The above-mentioned purpose occurs when a partition wall made of an elastic material is penetrated by a needle-like tube for supplying ink to a common ink chamber of a print head, and an opening of the common ink chamber is provided when ink is jetted from the head. This is achieved by an inkjet recording device that integrates a flexible plate that absorbs pressure waves.

Preferably, the integrated partition wall and flexible plate are removable from the head body.

In the present invention, the print head and ink connector of an inkjet recording device have the above configuration, and an epoch-making improvement has been made in that the flexible film of the print head and the partition of the ink connector, which were completely separate parts, are integrated. This makes it easier to process and assemble the print head and ink connector, reducing the number of parts and reducing costs.

Preferably, when the integrated flexible plate and the partition wall are made removable, it becomes easy to replace the flexible film at the common ink chamber opening, which has been considered a drawback in the past, and the partition wall in the ink connector can be easily replaced. This has advantages such as easy replacement of parts when damaged due to attachment and detachment of the needle tube.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

[Illustration 9 0 1 ] FIG. 4 is a perspective view schematically showing an M unit of a print head and an ink connector for explaining this embodiment. 100 is a print head, 101 is a substrate of the head 1()0, 1()
2 is a substrate 10 with grooves (not shown) for a number of nozzles communicating with the injection port 103 and a plurality of pressure chambers communicating with these nozzles.
The side plate formed on the surface in contact with 1 is shown. That side &1
02, piezoelectric change elements 104 of the same number as the number of nozzles are provided corresponding to the pressure chambers, and an opening 105 of a common ink chamber (not shown) that distributes and supplies ink to each pressure chamber. is provided.

The flexible plate 107 and the partition wall 1 (J8) according to the present invention may be made of the same or different materials, and in this embodiment, they are bonded with an adhesive or laminated, or are integrally formed. Since the sinterable plate 107 and the partition wall 108 can be made of the same material, if they are manufactured using this integral molding, they can be fitted to a female price.
The thickness of 7 is usually 0.3・-2.0 thin, preferably o, 5
~1. It is considered to be o7.

In addition, the ir = plate 107 has 1 test injection port 1 (J3) which is made wider than other areas if necessary to easily absorb the ink return pressure slope caused by the deformation of the pressure chamber during ink injection l and γ. TA Hakusento J]0 is provided.

The above-mentioned sacrificial plate 107 may be made of side resin such as polyethylene, boropylene, agglomerated vinylidene, etc., or a material such as butadiene rubber, isofrene rubber, butyl rubber, silicone rubber, or acrylic rubber. Bone is used, and a ql member arranged as a king is used for the partition wall.

It is desirable that the compression permanent position of JIS K-63 (11-1975) be less than or equal to JIS K-63 (11-1975.
There is an ink filter (not shown) and a partition wall 10 inside.
A sleeve 109 is provided that holds the 80 day surface. , I
II is a pressure y# plate for fixing the above-mentioned KAI! to the common ink chamber □ facing portion 105 of the side plate 102, and 112 is a pressure plate y# for fixing the above-mentioned KAI! An opening 113 provided opposite the thin wall 110 of the wire 107 is an opening for fitting the case 115 of the female contact portion 114 of the connector.

In this embodiment, the opening @1 of the pressure bonding plate 111 is
Case 115 of female contact @114, which will be described later, is shown in 13.
is treated with epoxy JMN agent.

However, in addition to bonding with adhesives, there are methods such as ultrasonic caulking and welding! They may be joined by il-, or the signboard 111 and the case 115 may be integrally processed. Four screw holes 117 located near the four corners of the common ink chamber opening 105 and extending from the shimane 101 and side &1o2, and four screw through holes 11 at the four corners of the burnable plate 107.
8 and four negative screw through holes 119 at the four corners of the crimp plate 111 are provided at positions corresponding to each other. Insert the four screws 120 through the screw holes 117, screw through holes 118 and 119 that correspond to each other, and tighten the four nuts 12.
1, or when a plate of the same shape as the crimp plate 111 having four nine-hole holes is attached and the screws 120 are turned to tighten the screws, the partition wall 108 is tightened by the crimp plate 111 to which the case 115 is adhesively bonded in advance. Flexible number 10 grouped together with
7 is fixed to the common ink chamber opening 105.

In addition, when the flexibility number is 1117, the area around the screw hole 11H may be made thicker than other screw areas if necessary (by doing so, the top of the succession plate 1 ( ) 7 due to the screw 1200 being missed will be reduced, and It is possible to increase the adhesion effect to the opening 105. Also, the opening of the punishable chest 107 @ 1
A crushing margin of width 1 to 5 spanning the 10704th circumference of the B=J baking plate is provided on the inward side corresponding to 0714Il to increase the adhesion effect to the opening and to prevent leakage of ink from the opening.
It is not possible to make it do ilT.

The case 115 of the female contact portion 1]4 has an opening 1.
16 is provided, and when the male contact portion 120 is sheathed to the female contact portion 114, the male contact portion 1
The 200 erythematous canal 121 is made to trace the septum 108 14 times through the front B pillow part 11b. In this way, the ink supplied from the ink tank (not shown) passes through the male contact 51200 and the fiber contact part 121.
4 and is supplied to the opening 105 of the print head.

As an application of the 1M column, the Loe individual plate and pressure bonding cloth for absorbing pressure waves during ink ejection are used to connect the ink connector that supplies ink to the substrate IL1111111 of the print head 100. 10
8 are integrally attached) to the side plate 1 of the print head 100.
021JIIK may be provided to share the roles. In this case, it is not necessary to provide the opening 112 in the pressure bonding plate 111. Further, the opening 105 is provided on the I & E 101 side, and the ink hole is provided on the 1111IJIL 102 side.

(Example N2) Fig. 5 is a cross-sectional view of the ink connector attached to the printing head for explaining this example, where 201 is the case of the female contact part of the ink connector, and 202 is the male contact (bottom in the figure). Case 20 for inserting a needle-like tube (without)
．． 1 opening ff1i, 203 is a partition wall made of silicone rubber housed in the case 201 so that the amount of compression is zero or positive in the vital direction and the axial direction, and 204 is a sinterable plate at the lower end a negative part of the partition wall 203. It can be used to make ice cubes. 20
5 is a protrusion provided near the lower end of the case 201; 206 is a sleeve that holds the inner surface of the front hc partition wall 2c); 2 (17);
is an opening provided on the sleeve, 208 is an ink storage chamber for ink supplied from the ink tank through the male contact part, 209 is an ink filter, and 2]o is a filter 209 for effective operation. Spacer,
Reference numeral 211 indicates the pressure 7H&, and 212 indicates the print head substrate. .

In order to supply ink to the print head, the ink contained in the male contact part (shown in the figure) of the ink connector is removed by opening the case 201 of the female contact part.
202, partition wall 203. Ink m 208 is supplied through a sleeve 206 and an opening 207 through a needle-like tube, etc., and passed through a filter 209 to the print head substrate 21.
2, the ink chamber opening tLK is supplied.

In the case of non-implementation, the bottom end 204 of the partition wall 203 also serves as the zero function of the burnable plate, and the bottom end 204 of the partition wall 203 is crimped and
4 of the print head by screwing method by 11! ! The pressure layer is fixed at the common ink chamber-mouth portion of the ink chamber 212. Note that the pressure $$211 is joined to the case 201 by caulking the lower end protrusion 205 of the case 2010.

(Effects of the invention) As explained above using the example of contamination, since the partition wall and the flexible wall are integrated into one unit, the number of parts can be reduced and costs can be reduced.
Furthermore, there are many effects such as further prevention of ink leakage. In addition, it is possible to produce young fruits by using a lifting platform which is preferably capable of being crushed and damaged parts can be easily replaced.

[Brief explanation of drawings]

FIGS. 1 and 2 are a cross-sectional view and a plan view schematically showing a print head of a known on-demand inkjet recording device, and FIG. 3 is a schematic cross-section of an ink connector attached to the J-shaped head. 4 is a perspective view showing the adhesion between the print head and the ink connector for explaining the first embodiment of the present invention, and FIG. 5 is a sectional view of the ink connector for explaining the second embodiment of the present invention. are shown respectively. 107・・・・・・・・・Kakuei018, 20
3. Lower end treatment portion 110 of partition wall 204 and old partition wall 203
・・・・・・・・・・・・ Thin wall city of bowl board 107
, 211... pressure shield temporary 113... eyes... EE:mlj! 1111
Opening] 17... Screw hole I
Nt, 119...Bis purchase hole 120...Bis agent Masu Rishino 1) thi Master picture 1 Figure 1 Figure 3

Claims (3)

[Claims] (1) A partition wall made of an elastic material through which a needle-like tube for supplying ink to a common ink chamber of the print head is inserted, and a partition wall formed of an elastic material that is formed when ink is ejected from the head at the opening of the common ink chamber. An I/Kujie-Shito hC recording device characterized by being integrated with a flexible plate that absorbs pressure waves. (2) The integrated partition wall and flexible plate are 1-1.
The inkjet recording device according to claim 1, wherein the inkjet recording device is removably attached to the print head. (3) The inkjet recording apparatus according to claim #81 or claim 2, wherein the partition wall that is separated from the elastic material is a part of the scraped contact portion of the ink connector.