JP4350187B2 - Inkjet recording device - Google Patents

Inkjet recording device Download PDF

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Publication number
JP4350187B2
JP4350187B2 JP852099A JP852099A JP4350187B2 JP 4350187 B2 JP4350187 B2 JP 4350187B2 JP 852099 A JP852099 A JP 852099A JP 852099 A JP852099 A JP 852099A JP 4350187 B2 JP4350187 B2 JP 4350187B2
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Japan
Prior art keywords
ink
solvent
air
nozzle
inside
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Expired - Fee Related
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JP852099A
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Japanese (ja)
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JP2000203050A (en
Inventor
誠 伊田
眞 坂井
秀明 神内
洋泰 長谷部
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株式会社キーエンス
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ink jet recording apparatus that forms a pattern on an object by ejecting ink from an ejection nozzle provided in a recording head, and in particular, deflects granular ink continuously ejected from the ejection nozzle only when necessary, The present invention relates to a continuous-type ink jet recording apparatus in which a desired pattern is formed according to the deflection amount.
[0002]
[Prior art]
Conventionally, continuous ink jet recording apparatuses have been widely used as convenient recording apparatuses for forming various patterns such as characters and figures on various industrial products.
[0003]
FIG. 2 is a schematic diagram illustrating a schematic configuration of a continuous ink jet recording apparatus. As shown in the figure, the ink jet recording apparatus is configured by connecting a main body case 1 and a recording head 2 by a connecting tube 3. In the main body case 1, an ink tank T in which printing ink is stored is stored.1And refill ink tank T2And a solvent tank T in which the ink solvent is stored.ThreeAnd are provided.
[0004]
Ink tank T11 includes a feeding pipe 10 for feeding ink or a solvent, and feeding ink or a solvent recovered from the recording head 2 as described later, and a feeding pipe 11 for supplying the recording head 2 with ink. The exhaust pipe 12 communicated with the outside air is connected. In the middle of the supply pipe 10, the pump P1Is installed, and ink tank T1Ink or solvent delivery to the pump P1This is done by the operation. Further, in the middle of the supply pipe 11, an ink supply pump P is provided.2, Filter F1And a regulator R, and an ink tank T1The ink stored inside the pump P2Filter F1The foreign matter is removed by the above-mentioned method, and the pressure is adjusted by the regulator R so as to be supplied to the recording head 2 through the connection tube 3 as will be described later.
[0005]
Refill ink tank T2Ink tank T1A replenishment pipe 13 for feeding replenishment ink is connected to the. This replenishment pipe 13 has an electromagnetic on-off valve V1Is connected to the feeding pipe 10 via the refilling ink tank T.2The replenishment ink stored in the inside is the electromagnetic on-off valve V.1When is opened, the pump P1The ink tank T passes through the refilling pipe 13 and the feeding pipe 10 by the operation of1It is supposed to be supplied inside. This supply is performed by an operation described later by the ink tank T.1When the ink inside decreases, the decrease is compensated and the ink tank T1This is done in order to keep the ink remaining amount in the inside appropriately.
[0006]
Solvent tank TThreeIs connected to a feeding pipe 14 for feeding the solvent stored therein. This feed pipe 14 is provided with an electromagnetic on-off valve V1Solenoid valve V installed in parallel2Is connected to the feed pipe 10 via the solvent tank TThreeThe solvent stored in the electromagnetic valve V2When is opened, the pump P1The ink tank T passes through the feed pipe 14 and the feed pipe 10 by the operation of1It is supposed to be supplied inside. This supply is the ink tank T1When the solvent component contained in the ink is lost due to evaporation, this loss is compensated and the concentration of the ink is maintained appropriately.
[0007]
In the middle of the supply pipe 14, a solvent supply pump PThreeAnd filter F2The feed pipe 14 is connected to the electromagnetic on-off valve V.2Is connected to the branch pipe 14a on the upstream side of the solenoid valve Va.2With the pump closed, the pump P2Drive the solvent tank TThreeThe solvent in the filter F2Thus, the dust is removed and introduced into the branch pipe 14a, and is supplied directly to the recording head 2 through the inside of the connecting tube 3 as will be described later. This supply is performed to clean the ejection nozzle 20 incorporated in the recording head 2 as will be described later, including the ink supply system and the recovery system. This cleaning is performed particularly when the ink jet recording apparatus is stopped.
[0008]
Further, the feed pipe 10 has an electromagnetic on-off valve V.1, V2Solenoid valve V in parallel withThreeThe solvent recovery pipe 16 is connected via the1, V2, VThreeAn ink recovery pipe 15 is connected to the downstream side. The solvent recovery pipe 16 is provided to recover the solvent used for cleaning the spray nozzle 20, and the solvent recovered in the solvent recovery pipe 16 is an electromagnetic on-off valve V.ThreeOpen the pump P1By operating the ink tank T through the feed pipe 101Returned inside and collected. The ink collection tube 15 is provided to collect excess ink ejected from the ejection nozzle 20 as described later and not used for printing. The excess ink collected in the ink collection tube 15 is supplied to the pump P.1Ink tank T through feed pipe 101Returned inside and collected.
[0009]
The recording head 2 includes an ejection nozzle 20 that ejects ink to be fed in one direction as will be described later, a collection gutter 21 that is arranged so as to face the ejection flow by the ejection nozzle 20, and an ejection nozzle 20. A charging electrode 22 and a deflection electrode 23 arranged side by side along the injection path leading to the gutter 21 are provided inside a housing 24 having a box shape.
[0010]
FIG. 3 is a schematic diagram showing a schematic configuration of the injection nozzle 20. The ejection nozzle 20 includes a hollow main body block 2a into which ink or a solvent is supplied, and a piezo vibrator 2b attached to one side of the main body block 2a with the vibrating piece protruding inward. It becomes. The main body block 2a has a small-diameter injection hole 2c that penetrates the end wall on the opposite side to the attachment side of the piezoelectric vibrator 2b inward and outward, and a supply port that penetrates the peripheral wall on the same side as the attachment side of the piezoelectric vibrator 2b inward and outward Similarly, 2d and a discharge port 2e penetrating the opposite peripheral wall inward and outward are formed. Inside the main body block 2a, there is provided a nozzle portion that is reduced in diameter toward the formation position of the injection hole 2c, and the piezoelectric vibrator 2b has the tip of the vibrating piece facing the vicinity of the injection hole 2c. It is arranged.
[0011]
In the ejection nozzle 20 configured as described above, when ink maintained at a predetermined pressure is introduced into the main body block 2a through the supply port 2d, the ink passes through the small-diameter ejection hole 2c and reaches a predetermined speed. It is injected at. At this time, when a predetermined voltage is applied to the piezo vibrator 2b to vibrate, the jet of ink ejected through the ejection holes 2c is constricted in a waveform according to the vibration, as shown in the figure. As the constriction gradually deepens as it moves in the ejection direction, it separates from each other due to surface tension, resulting in spherical ink particles I1, I2, IThree... and fly. At this time, the discharge port 2e is closed.
[0012]
As described above, the charging electrode 22 has the ink particles I.1, I2, IThreeThe deflection electrode 23 is arranged immediately after the position where the separation occurs, and the ink particles I fly separately from each other.1, I2, IThreeWhen passing through the position where the charging electrode 22 is disposed, each is charged to a different potential according to the voltage applied thereto, and passes through the position where the deflection electrode 23 is disposed. A high-voltage DC voltage is applied to the deflection electrode 23, and an electric field having a predetermined intensity is formed at the position where the deflection electrode 23 is disposed, and the ink particles I passing through the position are arranged.1, I2, IThreeAre deflected in accordance with the respective charge amounts by the action of the electric field.
[0013]
The ink particles deflected in this way jump out to the outside through a delivery port 25 formed in the housing 24 of the recording head 2, collide with and adhere to a target object (not shown), and a character, A desired pattern such as a figure is formed. Further, some of the ink particles that are not charged when passing through the charging electrode 22 go straight without being deflected at the position where the deflection electrode 23 is disposed, and are captured by the collection gutter 21 inside the housing 24. .
[0014]
The connecting tube 3 that connects the recording head 2 and the main body case 1 as described above is a hollow tube made of a flexible material, and includes an ink supply tube 30, a solvent supply tube 31, an ink recovery tube 32, and a solvent recovery tube. Contains 33. Each of the tubes 30, 31, 32 and 33 is extended inside the main body case 1, the extended end of the ink supply tube 30 is connected to the ink supply tube 11, and the extended end of the solvent supply tube 31 is supplied to the solvent. The extended end of the ink recovery tube 32 is connected to the ink recovery tube 15 and the extended end of the solvent recovery tube 33 is connected to the solvent recovery tube 16 to the branch tube 14a branched from the tube 14, respectively.
[0015]
Each of the tubes 30, 31, 32, and 33 is also extended to the inside of the recording head 2, and the extended ends of the ink supply tube 30 and the solvent supply tube 31 are connected to separate electromagnetic on-off valves K, respectively.1, K2The extended end of the ink recovery tube 32 is connected to a recovery gutter 21 arranged in front of the injection nozzle 20 to further recover the solvent. An extended end of the tube 33 is connected to the discharge port 2e provided in the injection nozzle 20.
[0016]
Thus, the ink is supplied to the recording head 2 by the electromagnetic on-off valve K.1And the supply port 2d is connected to the ink supply tube 30. The supplied ink is ejected from the ejection nozzle 20, and sent out from the recording head 2 by the above-described action of the charging electrode 22 and the deflection electrode 23. Used for pattern formation. When such ink is ejected, the discharge port 2e provided in the ejection nozzle 20 is closed. This closing is performed by the electromagnetic on-off valve V in the main body case 1.ThreeThis is realized by closing the.
[0017]
In addition, a part of the ink that goes straight without being deflected by the action of the charging electrode 22 and the deflecting electrode 23 and is captured by the gutter 211The ink tank T is sucked by the operation of the ink tank T and passes through the ink collection tube 32 and the feed tube 10.1To be recovered. At this time, the pump P1In this case, air is sucked together with the ink captured by the gutter 21, and this air is absorbed by the ink tank T.1After being introduced into the ink tank T1It is exhausted to the outside air through the exhaust pipe 12 connected to the outside.
[0018]
On the other hand, the electromagnetic on-off valve K2Is opened, the supply port 2d is connected to the solvent supply tube 31, and the solvent supply pump P inside the main body case 1 is connected.Three, The solvent tank TThreeThe solvent stored in the recording head 2 is supplied to the ejection nozzle 20 in the recording head 2 through the supply pipe 14, the branch pipe 14 a and the solvent supply tube 31. This supply is made, for example, in order to clean the ejection nozzle 20 in a state where the ejection of the ink is suspended during the suspension of the operation of the ink jet recording apparatus, with the solvent including the ink supply system and the recovery system. Such cleaning is indispensable in order to prevent clogging occurring in each part of the ink supply system and the recovery system including the inside of the ejection nozzle 20 due to coagulation of the remaining ink.
[0019]
At this time, the electromagnetic on-off valve V inside the body case 1ThreeIs opened, most of the solvent supplied to the recording head 2 flows back into the main body case 1 through the solvent recovery tube 33, and passes through the solvent recovery tube 16 and the feed tube 10 to the ink tank T.1Returned to A part of the solvent supplied to the recording head 2 is ejected from the ejection nozzle 20 and captured by the gutter 21, returns to the main body case 1 through the ink recovery pipe 32, and passes through the feed pipe 10 to the ink tank T.1Returned to
[0020]
[Problems to be solved by the invention]
In the conventional ink jet recording apparatus configured as described above, the ejection nozzle 20 is cleaned as described above when the ejection is stopped. As a result, after the operation is suspended, the ejection nozzle 20 is in a standby period until the next activation. The inside of the main body block 2a is filled with the solvent.
[0021]
However, as the solvent, a solvent having excellent vaporization properties such as methyl ethyl ketone (MEK) is used in order to speed up drying and fixing of the ink at the time of pattern formation. For example, when the operation suspension period is long, The solvent filled in the main body block 2a evaporates and is lost, and there is a possibility that the ink component slightly remaining in this solvent solidifies and adheres to each part in the main body block 2a. When it occurs in the vicinity of the ejection hole 2c, there is a problem that the ejection of ink from the ejection nozzle 20 is hindered upon restart after the operation stop.
[0022]
This problem can be solved by lengthening the cleaning time of the jet nozzle 20 with the solvent and reducing the ink component in the solvent filled in the main body block 2a as much as possible after the cleaning. However, in this case, the ink tank T is washed after washing.1The ink tank T by a large amount of solvent returned to1After the ink density (viscosity) in the ink drops and restarts operation, the above-mentioned granulation of the ink ejected from the ejection nozzle 20 is hindered by insufficient viscosity, resulting in a new problem that prevents good printing. However, when the decrease in the viscosity is excessively advanced, there is a possibility that printing may become impossible.
[0023]
In order to solve such a problem, after the inside of the main body block 2a of the injection nozzle 20 is washed with a solvent, air is sucked through the injection holes 2c, and this air fills the inside of the main body block 2a and waits. An inkjet recording apparatus has been proposed.
[0024]
In the ink jet recording apparatus configured as shown in FIG. 2, for example, the air on-off valve K in the print head 2 is sucked in.1, K2And the electromagnetic on-off valve V inside the main body case 1 is closed.ThreeIn this state, the pump P1This can be realized by driving. An air pump dedicated to sucking air may be provided separately.
[0025]
According to this configuration, the solvent used for cleaning is discharged from the inside of the main body block 2a due to the suction of the air, so that the ink component in the solvent is solidified in the main body block 2a and is less likely to adhere. And the above-mentioned problems can be effectively solved. On the other hand, the continuous type ink jet recording apparatus is used in the production line of various industrial products in order to print the production date, production number, etc., and the recording head 2 is inferior with much dust. If the air is sucked in as described above in such an environment, dust contained in the air may be introduced into the main body block 2a and clog the small-diameter injection hole 2c. As in the case where the ink is adhered, there is a problem that the ejection of the ink from the ejection nozzle 20 after the restart of the operation is hindered.
[0026]
The present invention has been made in view of such circumstances, and reduces the possibility of clogging of the injection nozzle during standby after the suspension of injection, and after resuming operation, a normal injection state is obtained immediately, An object of the present invention is to provide an inkjet recording apparatus that does not hinder pattern formation.
[0027]
[Means for Solving the Problems]
An ink jet recording apparatus according to the first aspect of the present invention provides:An ejection nozzle provided inside the housing of the recording head for ejecting ink, an ink tank for storing ink supplied to the ejection nozzle, and for supplying ink from the ink tank to the ejection nozzle An ink supply path; a gutter disposed opposite to the ejection nozzle; an ink recovery path for recovering ink captured by the gutter; and a solvent for cleaning the interior of the ejection nozzle. A solvent tank; a solvent supply path for supplying a solvent from the solvent tank to the spray nozzle; and a solvent recovery path connected to the spray nozzle for recovering the solvent used for cleaning the spray nozzle. An ink jet recording apparatus comprising: a first electromagnetic on-off valve interposed in the ink supply path;
A second electromagnetic on-off valve interposed in the solvent supply path, a pump for sucking the solvent used for cleaning the injection nozzle through the solvent recovery path, and after cleaning the injection nozzle And an air supply means for supplying clean air to the inside of the housing, and the ink jet recording apparatus drives the pump with both the first and second electromagnetic on-off valves closed by the air supply means. The supplied clean air inside the housing is sucked into the injection nozzle.
[0028]
In the present invention, the inside of the ejection nozzle that stops the ejection of ink when the operation is stopped, more specifically, the inside of the main body block is first cleaned with a solvent, and then the air is introduced into the housing of the recording head by the intake means. In this state, air is sucked into the inside of the injection nozzle through the injection hole, and the inside of the injection nozzle is filled with clean air supplied into the housing by the air supply means prior to the intake, Wait until the operation resumes.
[0029]
According to a second aspect of the present invention, an ink jet nozzle provided in a housing of a print head is cleaned by the ink solvent and then sucked from the jet hole when the jet is stopped. The ink jet recording apparatus configured to be filled with air is characterized by comprising control means for performing intake air from the ejection holes at predetermined intervals during the pause of the ejection.
[0030]
In the present invention, air is sucked into the ejection nozzles, which are not ejecting ink during the operation stop, every predetermined time, and the ink remaining in the ejection nozzles is periodically removed by this intake air. Wait until the operation is resumed to prevent clogging during this period, and after the operation is resumed, ink is ejected from the ejection nozzles satisfactorily.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof. FIG. 1 is a schematic diagram showing a schematic configuration of an ink jet recording apparatus according to the present invention. As shown in the drawing, the ink jet recording apparatus according to the present invention is configured by connecting a main body case 1 and a recording head 2 by a connecting tube 3 as in the conventional apparatus shown in FIG.
[0032]
Inside the main body case 1 is an ink tank T.1, Refill ink tank T2And solvent tank TThreeAnd these tanks T1, T2, TThreeBetween each other and the ink tank T1And solvent tank TThreePiping for transferring ink or solvent between the recording head 2 and the recording head 2 (feed pipe 10, supply pipe 11, replenishment pipe 13, feed pipe 14, branch pipe 14a, ink recovery pipe 15, solvent recovery pipe 16 ), And an electromagnetic on-off valve V interposed in these pipes1, V2, VThreeIs provided. These configurations are the same as those of the conventional apparatus shown in FIG. 2, and the same reference numerals are given to common components, and detailed description thereof is omitted.
[0033]
The recording head 2 includes an ejection nozzle 20, a gutter 21, a charging electrode 22 and a deflection electrode 23 in a rectangular box-shaped housing 24 in which an ink delivery port 25 is opened on one side thereof. Solenoid valve K that switches the supply route to1, K2It is configured with. These structures are the same as those of the conventional apparatus shown in FIG. 2, and the structure of the injection nozzle 20 is the same as that of the conventional injection nozzle 20 shown in FIG. 3, and the same reference numerals are given to common components. Therefore, detailed description is omitted.
[0034]
The connection tube 3 that connects the recording head 2 and the main body case 1 is a hollow tube made of a flexible material, and includes the ink supply tube 30, the solvent supply tube 31, the ink recovery tube 32, and the solvent recovery tube 33. is doing. These structures, as well as the connection relationship with the piping in the main body case 1 and the connection relationship with the structural members in the recording head 2, are also the same as those in the conventional apparatus shown in FIG. Detailed description will be omitted. In FIG. 1, the connecting tube 3 is shown as a short cylinder, but the length of the connecting tube 3 is appropriately set according to the separation distance between the main body case 1 and the recording head 2. It goes without saying that it is possible.
[0035]
The configuration different from the conventional one of the ink jet recording apparatus according to the present invention will be described below. An air pump AP is provided inside the main body case 1, and a suction side of the air pump AP is communicated with the outside of the main body case 1 by a suction pipe 17. On the discharge side of the air pump AP, the inside of the main body case 1 is extended toward the connecting portion with the connecting tube 3, and an air supply pipe 18 having an air filter AF is connected in the middle thereof.
[0036]
Further, the connection tube 3 includes an air supply tube 34 in parallel with the ink supply tube 30, the solvent supply tube 31, the ink recovery tube 32, and the solvent recovery tube 33. The air supply tube 34 is extended inside the main body case 1, and the extended end is connected to the air supply tube 18. The air supply tube 34 is also extended into the housing 24 of the recording head 2, and the extended end is open to the inside of the housing 24.
[0037]
When the air pump AP is driven by the above configuration, the outside air is sucked through the suction pipe 17 communicating with the outside of the main body case 1 and introduced into the air supply pipe 18 and passes through the air filter AF in the middle thereof. As a result, clean air from which dust has been removed is sent to the air supply tube 34 and supplied from the other opening end of the air supply tube 34 into the housing 24 of the recording head 2.
[0038]
Inside the recording head 2 are two electromagnetic on-off valves K.1, K2The jet nozzle 20 in the recording head 2 is connected to one electromagnetic on-off valve K.1When the ink is opened, the other electromagnetic on-off valve K is connected to the ink supply tube 30.2Are connected to the solvent supply tube 31 respectively, and the electromagnetic on-off valve K1, K2When both are closed, the ink supply tube 30 and the solvent supply tube 31 are not connected.
[0039]
In the ink jet recording apparatus according to the present invention configured as described above, the electromagnetic on-off valve K1Open the pump P inside the body case 11And P2Is driven, as in the conventional apparatus shown in FIG.1The ink inside the pump P2Is supplied to the injection nozzle 20 by the above operation and is injected, deflected by the above-described action of the charging electrode 22 and the deflection electrode 23, sent to the outside through the delivery port 25 formed in the housing 24, and collides with the object. It adheres and a desired pattern formation is made.
[0040]
Further, a part of the ink ejected from the ejection nozzle 20 goes straight without being deflected by the action of the charging electrode 22 and the deflection electrode 23 and is captured by the gutter 21, and the pump P1The ink tank T passes through the ink collection tube 32 and the feed tube 10 by the operation of1To be recovered. At this time, the pump P1The air sucked together with the ink is the ink tank T1It is discharged to the outside air through the exhaust pipe 12 connected to.
[0041]
In the ink jet recording apparatus shown in FIG. 1, a pressure sensor 4 for detecting the internal pressure is attached in the middle of the solvent recovery pipe 16 inside the main body case 1. The solvent recovery pipe 16 is connected to the electromagnetic on-off valve V during the above-described ink ejection.ThreeThe internal pressure of the tube is equal to the internal pressure of the ejection nozzle 20 in the recording head 2 communicated through the solvent recovery tube 33. The detected pressure of the pressure sensor 7 is the pressure of the ink that is about to be ejected from the ejection nozzle 20, and this detected pressure is given to a control unit (not shown) to supply the pump P for ink supply.2It is used for drive control. Accordingly, the internal pressure of the ejection nozzle 20, that is, the speed of the ink ejected from the ejection nozzle 20, can be accurately managed, and the above-described pattern formation with the ink can be performed with high accuracy.
[0042]
The above operation is performed by the ink feeding pump P.2However, in the ink jet apparatus according to the present invention, the ejection of ink from the ejection nozzle 20 is the same as that of the conventional apparatus except that the driving control is performed according to the pressure detected by the pressure sensor 7. In order to clean the spray nozzle 20, the following characteristic operation is performed when the operation is stopped.
[0043]
When the ink ejection from the ejection nozzle 20 is stopped, first, the electromagnetic on-off valve K2Is opened, the injection nozzle 20 is connected to the solvent supply tube 31, and the pump P inside the main body case 1 is connected.1And pump PThree, And the electromagnetic on-off valve V inside the body case 1ThreeIs released. As a result, the solvent tank TThreeThe solvent stored in the pump PThreeIs supplied to the jet nozzle 20 in the recording head 2 through the supply pipe 14, the branch pipe 14a and the solvent supply tube 31, and the inside of the jet nozzle 20 by this solvent, more specifically, the main body block 2a (see FIG. 3) is cleaned.
[0044]
Most of the solvent mixed with ink by this washing is refluxed into the main body case 1 through the solvent recovery tube 33 connected to the discharge port 2e (see FIG. 3), introduced into the solvent recovery tube 16, and Pump P1The electromagnetic on-off valve V opened by the operation ofThreeAnd the ink tank T through the feed pipe 101Returned to Further, a part of the solvent supplied to the recording head 2 is ejected from the ejection hole 2c (see FIG. 3) of the ejection nozzle 20 and goes straight, and is captured by the gutter 21, and then the ink connected to the gutter 21 is recovered. It returns to the inside of the main body case 1 through the tube 32 and is introduced into the ink recovery pipe 15 so that the pump P1Ink tank T through feed pipe 101Returned to
[0045]
After such cleaning is continued for a predetermined time, the air pump AP in the main body case 1 is driven for a predetermined time, the outside air is sucked through the suction pipe 17, and the air purified by the passage of the air filter AF is supplied to the air supply pipe 18. Then, the air is supplied into the housing 24 of the recording head 2 through the air supply tube 34. With this supply, the air in the housing 24 is mainly sent to the outside air through the delivery port 25, and the inside of the housing 24 is filled with clean air supplied by the operation of the air pump AP.
[0046]
Next, an electromagnetic on-off valve K inside the recording head 21, K2Are closed, the communication between the ejection nozzle 20 in the recording head 2 and the ink supply tube 30 and the solvent supply tube 31 is cut off. At the same time, the pump P in the main body case 1 is disconnected.1, And the solenoid valve VThreeIs released. As a result, the ink-mixed solvent staying inside the ejection nozzle 20, more specifically inside the main body block 2 a, is removed from the pump P.1And is returned to the main body case 1 through the solvent recovery tube 33, introduced into the solvent recovery tube 16, and opened.ThreeAnd the ink tank T through the feed pipe 101Returned to
[0047]
At this time, the electromagnetic on-off valve K1, K2Are both in a closed state, and the inside of the main body block 2a of the ejection nozzle 20 only communicates with the inside of the housing 24 of the recording head 2 through the ejection hole 2c. Accordingly, the inside of the main body block 2a is filled with air sucked through the injection holes 2c as the solvent is sucked. At this time, since the inside of the housing 24 communicating with the outside of the injection hole 2c is filled with the previously supplied clean air, the inside of the main body block 2a is filled with clean air that does not contain dust. It will be satisfied.
[0048]
As described above, in the ink jet apparatus according to the present invention, the cleaning of the ejection nozzle 20 that has stopped ejecting ink supplies clean air into the housing 24 of the recording head 2 after cleaning with a solvent. Since it is performed by the procedure of sucking air into the injection nozzle 20, the inside of the injection nozzle 20 is filled with clean air during the standby period until the next restart of operation, and around the injection hole 2c. There is almost no possibility of ink coagulation and dust adhesion, and a normal ejection state can be obtained immediately after resumption of operation, and pattern formation is not hindered.
[0049]
In the cleaning operation performed as described above when the injection nozzle 20 is stopped, the pump P1, P2And air pump AP drive, stop, electromagnetic on-off valve K1, K2Open / close and solenoid valve VThreeHowever, these operations are performed according to control signals generated by setting respective timings and durations by counting the timers by the operation of a control unit (not shown) including a timer. It is supposed to be done automatically.
[0050]
Also, during the cleaning operation described above, the pump P1As a result of this operation, the ink collection tube 32 connected to the gutter 21 inside the recording head 2 and the ink remaining in the ink collection tube 15 connected to the ink collection tube 32 in the main body case 1 are also sucked into the ink tank T.1Returning to FIG. 2, the insides of the ink collection tube 32 and the ink collection tube 15 are filled with clean air inside the housing 24 that is sucked through the gutter 21. Therefore, there is no possibility that the ink collection tube 32 and the ink collection tube 15 are clogged during the operation stop, and the ink collection is not hindered after the operation is resumed.
[0051]
As described above, in the present invention, the ink supply system and recovery system including the ejection nozzle 20 and the gutter 21 are cleaned by a procedure of sucking air after washing with a solvent by simple control using the timer. From this, it is possible to reliably remove the ink remaining in a film shape on the peripheral walls of the ejection nozzle 20 and the gutter 21, and to reliably eliminate the occurrence of clogging of each part due to the solidification of the ink, Since the air to be sucked is clean air previously introduced into the housing 24 of the recording head 2, as described above, the occurrence of clogging of each part due to the adhesion of dust is also effective during the standby period during the operation stop. Can be prevented.
[0052]
Further, the control unit continues the time counting by the timer even during the suspension of operation, and every time this time reaches a predetermined time set in advance, the above-described intake operation, that is, the electromagnetic on-off valve K1, K2Are closed together and the pump P1, And the solenoid valve VThreeIs configured to perform the operation of releasing the.
[0053]
As a result, the air is periodically sucked into the inside of the ejection nozzle 20 during a long-term suspension of operation such as at night or on holidays, and the ink that remains slightly in the ejection nozzle 20 and adheres to the inner wall surface in a film form. It can be recovered and removed. In particular, since the intake air is made from the injection hole 2c, occurrence of clogging of the injection hole 2c can be reliably prevented. In addition, since this is realized only by air intake without using a solvent, the consumption of the solvent does not increase.
[0054]
At this time, the intake operation into the housing 24, that is, the operation of the air pump AP in the main body case 1 is performed prior to the above-described intake at every predetermined time, so that clean air is supplied into the housing 24. This is more preferable.
[0055]
【The invention's effect】
As described above in detail, in the ink jet recording apparatus according to the first aspect of the present invention, the inside of the ejection nozzle of the recording head that suspends the ejection of ink as the operation is suspended is washed with a solvent, and then the air sucked from the ejection holes is used. Prior to filling, clean air is introduced into the housing of the recording head by the operation of the air supply means. In addition, it is possible to prevent the occurrence of clogging of the ejection nozzle due to ink coagulation and dust adhesion, and when the operation is resumed thereafter, a normal ejection state can be obtained immediately, which may hinder pattern formation. Can be relaxed.
[0056]
In the ink jet recording apparatus according to the second aspect of the invention, since the intake air is taken into the ejection nozzles during ejection pauses at predetermined intervals, the ink that remains slightly in the ejection nozzles until the operation is resumed And can effectively prevent clogging of the injection nozzle during this period, and after resuming operation, a normal injection state can be obtained immediately and the possibility of hindering pattern formation can be alleviated. For this reason, the present invention has excellent effects such as an increase in various solvent costs and no increase in running cost.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a schematic configuration of an ink jet recording apparatus according to the present invention.
FIG. 2 is a schematic diagram illustrating a schematic configuration of a conventional inkjet recording apparatus.
FIG. 3 is a schematic diagram showing a schematic configuration of an injection nozzle.
[Explanation of symbols]
1 Body case
2 Recording head
2a Body block
2c injection hole
3 Connecting tube
17 Suction pipe
18 Air supply pipe
34 Air supply tube
AP air pump
AF air filter
T1  Ink tank

Claims (2)

  1. An ejection nozzle provided inside the housing of the recording head for ejecting ink;
    An ink tank for storing ink supplied to the ejection nozzle;
    An ink supply path for supplying ink from the ink tank to the ejection nozzle;
    A gutter arranged to face the spray nozzle;
    An ink collection path for collecting the ink captured by the gutter;
    A solvent tank for storing a solvent for cleaning the inside of the injection nozzle;
    A solvent supply path for supplying a solvent from the solvent tank to the spray nozzle;
    In an ink jet recording apparatus that is connected to the jet nozzle and includes a solvent recovery path for recovering the solvent used for cleaning the jet nozzle.
    A first electromagnetic on-off valve interposed in the ink supply path;
    A second electromagnetic on-off valve interposed in the solvent supply path;
    A pump for sucking the solvent used for cleaning the spray nozzle through the solvent recovery path;
    An air supply means for supplying clean air into the housing after cleaning the spray nozzle;
    The ink jet recording apparatus sucks clean air inside the housing supplied by the air supply means into the jet nozzle by driving the pump with both the first and second electromagnetic on-off valves closed. An ink jet recording apparatus.
  2. The air supply means includes an air pump for sucking outside air;
    An air supply path for supplying outside air sucked by the air pump to the injection nozzle;
    The ink jet recording apparatus according to claim 1, further comprising an air filter provided in the air supply path.
JP852099A 1999-01-14 1999-01-14 Inkjet recording device Expired - Fee Related JP4350187B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP852099A JP4350187B2 (en) 1999-01-14 1999-01-14 Inkjet recording device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP852099A JP4350187B2 (en) 1999-01-14 1999-01-14 Inkjet recording device

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JP2000203050A JP2000203050A (en) 2000-07-25
JP4350187B2 true JP4350187B2 (en) 2009-10-21

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Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3238992B2 (en) * 1993-08-13 2001-12-17 三井化学株式会社 Aromatic polycarbonate
US7475974B2 (en) 2005-03-11 2009-01-13 Hitachi Industrial Equipment Co., Ltd. Inkjet recording apparatus
US7645033B2 (en) 2006-03-03 2010-01-12 Silverbrook Research Pty Ltd Ink reservoir with automatic air vent
US7645034B2 (en) * 2006-03-03 2010-01-12 Silverbrook Research Pty Ltd Pulse damped fluidic architecture
CN101287606B (en) 2006-03-03 2010-11-03 西尔弗布鲁克研究有限公司 Pulse damped fluidic architecture
JP4764178B2 (en) * 2006-01-17 2011-08-31 株式会社キーエンス Inkjet recording device
US7661803B2 (en) 2006-07-31 2010-02-16 Silverbrook Research Pty Ltd Inkjet printhead with controlled de-prime
JP4832356B2 (en) * 2007-05-08 2011-12-07 株式会社日立産機システム Inkjet recording device
JP5427387B2 (en) * 2008-10-03 2014-02-26 株式会社日立産機システム A path cleaning method for an inkjet recording apparatus.
JP6266359B2 (en) * 2014-01-24 2018-01-24 株式会社キーエンス Ink jet recording apparatus and head cleaning method thereof
JP5786063B2 (en) * 2014-05-23 2015-09-30 株式会社日立産機システム Inkjet recording device
JP6360755B2 (en) * 2014-09-04 2018-07-18 東芝テック株式会社 Ink circulating device cleaning device and ink circulating device cleaning method

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