WO2006006380A1 - インクジェットプリンタ - Google Patents
インクジェットプリンタ Download PDFInfo
- Publication number
- WO2006006380A1 WO2006006380A1 PCT/JP2005/011745 JP2005011745W WO2006006380A1 WO 2006006380 A1 WO2006006380 A1 WO 2006006380A1 JP 2005011745 W JP2005011745 W JP 2005011745W WO 2006006380 A1 WO2006006380 A1 WO 2006006380A1
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- WO
- WIPO (PCT)
- Prior art keywords
- ink
- tank
- intermediate tank
- recording head
- jet printer
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
Definitions
- the present invention relates to an ink jet printer, and more particularly to an ink jet printer that performs image recording using high-viscosity ink.
- Ink jet printers are generally known as means capable of printing on various recording media.
- Inkjet printers use, for example, piezo elements and heaters, etc., and the nozzle force of the recording head ejects ink as fine droplets toward a recording medium such as paper, and performs recording while penetrating or fixing the ink to the recording medium. Since the image is recorded on the recording medium by moving the head on the recording medium, there is an advantage that printing according to demand is possible because a plate making process is not required.
- inkjet printers using a photocurable ink that is cured by light such as ultraviolet rays are known. According to this, ink is cured by irradiating the ink landed on the recording medium with light. Since it can be fixed on a recording medium, it does not absorb ink, such as a transparent or translucent resin film, and can be easily printed on a recording medium.
- a means to reduce the effect of pressure loss by providing a sub tank that supplies ink to the printer, shortening the distance from the sub tank to the recording head, and providing a back pressure management pump that manages the back pressure of ink Is known (see, for example, Patent Document 1).
- the ink used is a high-viscosity ink
- pressure loss is recorded in the image recording.
- the diameter of the ink supply tube is 7 mm or more.
- the length of the ink supply tube is preferably lm or less.
- a weight sensor is provided in the ink tank so as to detect a change in the weight of the ink tank, thereby detecting the remaining amount of ink, and counting the amount of ink discharged during image recording.
- Means for calculating the remaining amount of ink in the ink tank by subtracting the total amount of ink in the ink tank from the counted ink amount for example, see Patent Document 2
- Patent Document 1 Japanese Patent No. 2934016
- Patent Document 2 Japanese Patent Laid-Open No. 9-248917
- the means for counting the amount of ink ejected at the time of image recording does not count such outflow of ink, and the amount of ink that flows out during abnormal ejection or cleaning is managed with high accuracy. This makes it difficult to accurately grasp the remaining amount of ink.
- the present invention has been made to solve the above-described problems, and provides an ink jet printer that can reduce ink pressure loss and perform stable image recording with a simple configuration.
- the purpose is to provide an ink jet printer that can detect the ink replenishment timing accurately and easily by detecting this when there is no remaining ink in the ⁇ ilH tank. is there.
- the present invention includes an ink tank that stores ink, a recording head that discharges ink, and an ink supply pipe that supplies ink to the recording tank force and the recording head.
- An intermediate tank having a damping function is provided in the middle of the ink supply pipe and has a damping function against pressure fluctuations that temporarily store ink, and ink is supplied to the intermediate tank between the ink tank and the intermediate tank.
- a liquid feed pump is installed,
- a remaining amount detecting means for detecting the remaining amount of ink in the intermediate tank, an informing means for informing when there is no ink remaining in the ink tank, and the remaining amount detecting means are provided in the intermediate tank.
- the control unit determines that there is no remaining ink in the ink tank.
- the notification means notifies the fact.
- the present invention having such a configuration is an intermediate tank installed in the middle of an ink supply pipe.
- the control unit controls the liquid feed pump to send the ink in the ink tank to the intermediate tank. . If the remaining amount detecting means does not detect that the remaining amount of ink in the intermediate tank has increased even when the liquid feed pump is operated, the notification means indicates that the remaining amount of ink in the ink tank is insufficient. I'm getting informed.
- the present invention provides the ink jet printer, wherein the intermediate tank includes an ink chamber for storing ink, and a flexible damper film is provided on at least one surface of the ink chamber, and the damper film is disposed on the intermediate tank. It is characterized by providing an elastic member that is held at a predetermined initial position.
- the damper film provided on one surface of the ink chamber in the intermediate tank stagnates so as to absorb ink pressure fluctuation caused by inflow and outflow of ink.
- the damper film is held at a predetermined initial position by an elastic member to keep the ink chamber in a negative pressure state.
- the present invention is characterized in that, in the ink jet printer, the remaining amount detecting means is a photo sensor for detecting a position of the damper film or a pressure sensor for detecting the pressure of the ink flowing out of the intermediate tank force.
- the remaining amount detecting means is a photo sensor for detecting a position of the damper film or a pressure sensor for detecting the pressure of the ink flowing out of the intermediate tank force.
- the present invention having such a configuration detects whether or not a predetermined amount of ink remains in the intermediate tank by a photo sensor or a pressure sensor.
- the present invention provides the ink jet printer, wherein the recording head heats ink, which is a liquid having a viscosity of 10 to 500 mPa ⁇ s at 30 ° C, to 30 to 150 ° C by a heating unit, so that one dot is obtained. It is characterized by being discharged so as to be 2 to 20 pl small droplets.
- image recording is performed using a high-viscosity ink having a viscosity of 10 to 500 mPa's at 30 ° C! / Speak.
- the ink is a photo-curing ink that is cured by irradiating light
- the recording medium is disposed downstream of the recording head in the transport direction of the recording medium.
- a light irradiation device for irradiating light on ink landed on a medium is provided.
- the present invention irradiates the ink ejected from the recording head with light.
- the ink is cured and fixed on the recording medium.
- the ink is an ultraviolet curable ink that is cured by being irradiated with ultraviolet rays, and at least a part of the light irradiated by the light irradiation device is ultraviolet rays. It is characterized by being.
- the ink is cured and fixed on the recording medium.
- the present invention is characterized in that, in the ink jet printer, the ink is a high-viscosity ink and is a cationic polymerization type ultraviolet curable ink.
- image recording is performed using an ink having a high viscosity and, in particular, a cationic polymerization type ultraviolet curable ink mainly composed of a monomer.
- the invention provides the ink jet printer, wherein the recording medium absorbs ink.
- the present invention has no ink absorptivity such as grease and performs image recording on a recording medium.
- the present invention a fixed amount of ink is always stored in the intermediate tank provided immediately before the recording head, and the ink necessary for image recording is appropriately supplied to the intermediate tank force recording head. Therefore, the influence of pressure loss can be minimized. For this reason, even when image recording is performed using high-viscosity ink, the ink can be guided and ejected to the nozzles of the recording head only by the ejection force of the recording head. In addition, the ink can be stably ejected.
- the present invention it is possible to determine whether or not there is a remaining amount of ink in the ink tank by detecting whether or not the intermediate tank is filled with ink. Unlike the case of directly detecting the weight of ink, it is not affected by other elements such as ink tank parts. In addition, unlike the case of counting the printing amount or the like, it is also possible to detect a decrease in the ink amount due to the outflow of ink other than image recording. For this reason, it is possible to accurately grasp the replenishment timing of the ink in the ink tank, and the ink is suitable even when continuous image recording is performed. By replenishing properly, there is an effect that a stable image recording operation can be performed. In addition, when there is no ink remaining in the ink tank, the notification means notifies the user, so that the user can be sure that there is no ink remaining and can replenish ink appropriately. Play.
- the intermediate tank can absorb the ink pressure fluctuation caused by the inflow and outflow of the ink. it can.
- the damper film is held at a predetermined initial position by the elastic member, when the ink in the intermediate tank decreases, the elastic member pushes back the damper film to be put inside the intermediate tank. This makes it possible to maintain a constant negative pressure in the intermediate tank. For this reason, the ink can be stably ejected from the recording head regardless of the inflow and outflow of ink, and the ink can be prevented from leaking from the recording head other than during image recording.
- the present invention it is possible to detect whether or not a predetermined amount of ink remains in the intermediate tank with a simple configuration of a photosensor or a pressure sensor. For this reason, the remaining amount of ink in the intermediate tank can be grasped without complicating and increasing the size of the intermediate tank, which contributes to downsizing of the apparatus and light weight.
- the recording medium P since a high-viscosity ink having a viscosity at 30 ° C of 10 to 500 mPa's is used, the recording medium P has no ink absorbability. It is possible to perform high-quality image recording without causing ink flow or the like above, and even when such high-viscosity ink is used, ink pressure loss is reduced and ink is discharged smoothly. If there is no ink remaining in the ink tank, it can be easily detected!
- the ink is heated to 30 to 150 ° C and discharged from the recording head, image recording can be performed while ink discharge from the nozzle is maintained in a good state, and further, the ink is discharged by one dose. Since the ink is ejected as small droplets of 2 to 20 pl, high quality images can be obtained even with high viscosity ink. Even in such a case, ink pressure loss can be reduced and ink can be ejected smoothly, and when there is no ink remaining in the ink tank, it can be easily detected. And has the effect.
- the ink is cured by irradiating the ink with ultraviolet rays, the ink absorbability of a resin film or the like is poor, and an image can be formed on a recording medium.
- the ink pressure loss can be reduced and ink can be ejected smoothly, and when there is no ink remaining in the ink tank, it can be easily detected. And has the effect.
- the ink is cured by irradiating the ink with ultraviolet rays, the ink absorbability of a resin film or the like is poor, and an image can be formed on a recording medium.
- the ink pressure loss can be reduced and ink can be ejected smoothly, and when there is no ink remaining in the ink tank, it can be easily detected. And has the effect.
- the pressure loss of the ink is reduced and smooth. Ink can be ejected, and when there is no ink remaining in the ink tank, it can be easily detected to that effect.
- the present invention there is no ink absorptivity such as resin, and even when an image is recorded on a recording medium, a high viscosity ink is used to prevent the ink from flowing on the recording medium. Even in such a case, ink pressure loss can be reduced and ink can be ejected smoothly, and when there is no ink remaining in the ink tank, this can be done easily. If this can be detected, the effect is achieved.
- FIG. 1 is a side view schematically showing a main part of a first embodiment of an ink jet printer according to the present invention.
- FIG. 2 is a side sectional view of the intermediate tank portion of the ink jet printer according to the present invention.
- FIG. 2 (b) is a front view of the intermediate tank portion of the ink jet printer according to the present invention.
- FIG. 3 is a principal block diagram showing an outline of a control configuration of the first embodiment of the ink jet printer according to the present invention.
- FIG. 4 shows a modification of the first embodiment of the ink jet printer according to the present invention. It is a side view.
- FIG. 5 is a side view schematically showing the main part of a second embodiment of the ink jet printer according to the present invention.
- the ink jet printer 1 is a serial print type ink jet printer 1, and the ink jet printer 1 has a recording medium P formed on a non-recording surface.
- a supporting platen 2 is provided.
- Conveying rollers 3 and 4 for conveying the recording medium P while maintaining the recording medium P at substantially the same height as the platen 2 are rotatably provided on the upstream side and the downstream side of the platen 2, respectively.
- the recording medium transport mechanism 30 (see FIG. 3) rotates the transport rollers 3 and 4 to transport the recording medium along the upper surface of the platen 2 in a predetermined transport direction X.
- a rod-shaped guide rail 5 extending in the main scanning direction perpendicular to the conveyance direction X of the recording medium P is provided above the platen 2.
- a carriage 6 is supported on the guide rail 5, and the carriage 6 is reciprocated in the main scanning direction along the guide rail 5 by a carriage driving mechanism 29 (see FIG. 3). .
- each color for example, yellow ( ⁇ ), magenta (M), cyan (C), black (K) used in the ink jet printer 1 in the present embodiment. 7 is installed.
- a plurality of nozzles (not shown) for ejecting ink are provided on the surface of the recording head 7 facing the recording medium P.
- the nozzles of each recording head 7 are provided with, for example, a piezoelectric element (not shown) as a piezoelectric element that is deformed by applying a voltage. By applying a driving voltage to the piezoelectric element, the piezoelectric element is provided. Thus, the ink flow path is compressed and ink is ejected from the nozzles.
- a heater (not shown) is disposed in the ink flow path so as to heat the ink before ink is ejected.
- the ink be ejected as fine droplets with 2 to 20 pl per dot.
- the ink used in the ink jet printer 1 is not limited to those illustrated, for example, light yellow (LY ), Light magenta (LM), light cyan (LC), etc. can also be used.
- the recording head 7 corresponding to each color is mounted on the carriage 6.
- the ink used in the present embodiment is a photocurable ink having a property of being cured when irradiated with ultraviolet rays as light, and has at least a polymerizable compound (a known polymerizable property) as a main component.
- a compound a photoinitiator, and a coloring material.
- the above-mentioned photocurable inks are generally classified into radical polymerization inks containing a radical polymerizable compound as a polymerizable compound and cationic polymerization inks containing a cationic polymerizable compound. Each type of ink is applicable as the ink used in the present embodiment.
- a hybrid ink of a radical polymerization type ink and a cationic polymerization type ink may be applied as the ink used in this embodiment.
- a cationic polymerization ink because the cationic polymerization ink is superior in functionality and versatility with little or no inhibition of the polymerization reaction by oxygen.
- the cationic polymerization ink is a mixture containing at least a cationically polymerizable compound such as an oxetane compound, an epoxy compound, a vinyl ether compound, a light-power thione initiator, and a coloring material.
- the ink used in the present embodiment is a high-viscosity ink having a viscosity of 10 to 500 mPa's at 30 ° C. Since the viscosity of the ink decreases when the ink is heated, high-viscosity ink is smoothly ejected and even when ejected as fine droplets, it can be landed accurately on the recording medium, enabling high-definition image recording. In order to do this, it is desirable to heat the ink temperature from 30 ° C to 150 ° C with a heater before discharging the ink! /.
- an ultraviolet irradiation device 8 having a length dimension approximately equal to the length of the recording head 7 with respect to the recording medium conveyance direction X is provided inside the carriage 6 and between the side wall of the carriage 6 and the recording head 7. Are arranged extending in the longitudinal direction of the recording head 7.
- the ultraviolet irradiation device 8 is provided with an ultraviolet light source (not shown).
- the ultraviolet light source for example, a high-pressure mercury lamp, a low-pressure mercury lamp, a metal lamp, a ride lamp, a semiconductor laser, a cold cathode tube, an excimer lamp, or an LED (Light Emitting Diode) can be applied.
- the position where the ultraviolet irradiation device 8 is provided is not limited to this.
- the ultraviolet irradiation device 8 may be provided between the recording heads 7.
- Each of these recording heads 7 includes yellow (Y), magenta (M), cyan (C), and black (K).
- the sub-tanks 10 for temporarily storing the inks of the respective colors are connected through ink supply pipes 9a formed of flexible materials.
- Each sub tank 10 is connected to the main tank 11 via an ink supply pipe 9b, and the ink in each main tank 11 is supplied to the sub tank 10 through the ink supply pipe 9b. After being stored in the recording head 7, it is supplied to each recording head 7.
- the sub tank 10 is provided at a position below the recording head 7 in FIG. By making the position of the sub-tank 10 lower than the recording head 7, the ink in the recording head 7 is kept in a negative pressure state, so that the ink is not leaked except during image recording.
- the sub tank 10 is provided with a sub tank sensor 27 that detects the amount of ink stored inside.
- the sub tank sensor 27 detects, for example, the ink level stored in the sub tank 10, and the ink in the sub tank 10 is determined depending on whether the ink level is equal to or higher than a predetermined height. It is possible to grasp whether or not the amount is greater than or equal to a predetermined amount.
- the sub tank sensor 27 is not limited to the one illustrated here as long as it can detect the amount of ink in the sub tank 10, and for example, a weight sensor or the like may be used.
- an intermediate tank 12 provided with an ink chamber 13 for storing ink therein is provided in the middle of the ink supply pipe 9a and between the sub tank 10 and the recording head 7. It is located close to head 7.
- the intermediate tank 12 close to the recording head 7, it is sufficient to supply the ink stored in the intermediate tank 12 to the recording head 7 when ejecting ink. It is possible to minimize the influence of the pressure loss generated when the ink flows in the tubes 9a and 9b on the ink ejection. As a result, even when high viscosity ink is used for image recording, it is possible to prevent the occurrence of ink ejection failure due to pressure loss.
- An ink inlet 14 through which ink flows into the ink chamber 13 is provided at one upper end of the intermediate tank 12 in FIGS. 1 and 2, and the ink from the ink chamber 13 is provided at the lower end of the intermediate tank 12.
- An ink outlet 15 is provided for discharging the ink.
- An ink supply pipe 9a is connected to each of the ink inlet 14 and the ink outlet 15, and the ink supplied by the sub tank flows into the ink chamber 13 from the ink inlet 14 via the ink supply pipe 9a. , Ink chamber 13 The ink flowing into the ink is sent from the ink outlet 15 to the recording head 7 through the ink supply pipe 9a.
- An opening 16 is formed on one side surface of the ink chamber 13, and a damper film 17 is stretched over the opening 16.
- the damper film 17 also has a flexible film force such as, for example, a polyethylene film.
- the damper film 17 is thermally welded to the opening 16 to seal the opening.
- the material of the flexible film constituting the damper film 17 is not limited to those exemplified here, but some inks used for image recording have corrosive properties. For the contact portion, it is desirable to use a material having corrosion resistance so that the damper film 17 is not deteriorated by the ink stored in the ink chamber 13.
- a coil spring 18 as an elastic member is provided on a wall surface inside the ink chamber 13 and facing the opening 16 so that one end thereof is in contact with the damper film 17.
- the coil panel 18 supports the damper film 17 at a predetermined initial position when ink flows into the ink chamber 13 of the intermediate tank 12.
- the initial position means the force that the ink flowing into the intermediate tank 12 tends to flow toward the recording head 7 due to its own weight, and the force that the coil panel 18 tries to maintain the position of the film surface of the damper film 17.
- the damper film 17 is pushed back to the initial position by the repulsive force of the coil panel 18, and the damper film 17 balances with the force that tries to squeeze inward, so that the inside of the ink chamber 13 becomes a negative pressure state! /
- the coil panel 18 is used as the elastic member that supports the damper film 17.
- the elastic member is not limited to the coil panel 18 as long as it is a stretchable member that can support the damper film 17. . Therefore, example For example, you can use various panels such as panel panels and stretchable resin.
- a remaining amount detecting means for detecting the remaining amount of ink stored in the ink chamber 13 of the intermediate tank 12 near the outside of the intermediate tank 12 where the damper film 17 is provided.
- a film surface detection sensor 19 for detecting the position of the film surface of the damper film 17 is provided.
- the film surface detection sensor 19 includes a rod 20 having a length longer than the length corresponding to the difference between the position when the damper film 17 is pinched outward and the position when it is pinched inward.
- the tip portion is provided in contact with the damper film 17.
- the rod 20 can be moved forward and backward with respect to the damper film 17 by an actuator such as a cylinder.
- the film surface detection sensor 19 includes, for example, a light emitter 21 that includes a light emitting element that emits light such as infrared light, and a light receiver 22 that includes a light receiving element that senses light emitted from the light emitter 21.
- the light emitter 21 and the light receiver 22 are arranged so that the light emitting surface (not shown) of the light emitter 21 and the light receiving surface (not shown) of the light receiver 22 face each other across the rod 20.
- the damper film 17 is pressed outward, and the rod 20 in contact with the damper film 17 is also pressed.
- the rod 20 is pressed and is pushed in from the position where the light emitter 21 and the light receiver 22 in the film surface detection sensor 19 are provided to the back, the light emitted from the light emitter 21 is transmitted to the rod 20. Is not received by the receiver 22.
- the damper film 17 stagnate inside the intermediate tank 12, and the rod 20 protrudes accordingly.
- the light receiver 21 receives the light emitted from the light emitter 22.
- the tip of the rod 20 comes into contact with the predetermined position of the film surface of the damper film 17. You will be able to figure out whether or not the force is standing inward from the position!
- the damper film 17 is directed toward the inner side of the ink chamber 13 along with this to cause stagnation.
- the lub spring 18 tries to push the damper film 17 back to the initial position by the repulsive force, which causes a negative pressure in the ink chamber 13 of the intermediate tank 12 and in the ink supply pipe 9a from the intermediate tank 12 to the recording head 7. Will occur.
- the recording head 7 is used depending on the weight of the ink stored in the intermediate tank 12 and in the ink supply pipe 9a between the intermediate tank 12 and the recording head 7. It is necessary that a predetermined pressure is applied to the nozzles. When a certain amount or more of ink is stored in the intermediate tank 12, an appropriate pressure on the nozzle can be ensured, and the ink can be smoothly ejected by the ejection force of the recording head 7. If the negative pressure generated in the ink supply pipe 9a up to the intermediate tank 12 and the recording head 7 exceeds a certain limit, the ink cannot be properly discharged by the ink discharge force of the recording head 7 alone. Become.
- the discharge force that the recording head 7 can discharge ink is about -300 Pa, and if a negative pressure higher than this is applied, it will not be possible to properly discharge ink from the nozzles, causing a discharge failure. It becomes. Therefore, in order to maintain an appropriate pressure on the nozzle, the film surface detection sensor 19 detects the film surface position of the damper film 17 to determine whether the remaining amount of ink in the intermediate tank 12 is kept constant. It can be detected as appropriate.
- a liquid feed pump 23 for supplying ink to the intermediate tank 12 is provided, and the ink in the intermediate tank 12 is provided.
- the ink stored in the sub tank 10 is forcibly sent.
- Various pumps such as a diaphragm pump and a gear pump can be applied as the liquid feed pump 23.
- the liquid feed pump 23 is preferably a metering pump having a constant liquid feed amount per drive unit (stroke) of the pump.
- a metering pump for example, various pumps such as a diaphragm pump, a gear pump, a plunger pump, a snake pump, and a rotary pump are applicable.
- a plunger-type pump can be preferably used for feeding an ink having a viscosity of 10 to 500 mPa's at 30 ° C. Plunger-type pumps are capable of delivering minute amounts of liquid, can measure the amount of liquid delivered with high accuracy, can deliver liquid at high pressure, and have a high degree of freedom in selecting the materials that make up the pump. It is advantageous.
- the material that comes into contact with ink is made of a material that does not easily deteriorate even when reactive ink such as stainless steel, ceramic, or fluorocarbon resin is fed. It is preferable because the amount of liquid fed per stroke can be maintained.
- the amount of liquid fed per stroke of the metering pump is preferably relatively small. If the amount of liquid delivered per stroke is small, the increase / decrease that occurs in the amount of liquid delivered per stroke can be leveled, and this is preferable because it can approach the desired amount of liquid delivered. In the present embodiment, 1% or more and 30% or less of the dumpable capacity of the intermediate tank 12 is preferable, and 1% or more and 5% or less is more preferable.
- the error in the amount of liquid delivered per stroke of the metering pump is preferably within 5%.
- the liquid feed pump 23 is a metering pump with a constant liquid feed amount per stroke, the amount of ink used can be detected easily and accurately by counting the total number of operating strokes. be able to. Further, by counting the total number of operation strokes of the liquid feed pump 23 after the main tank 11 is loaded, the amount of ink remaining in the main tank 11 can be detected with high accuracy. This allows you to
- the amount of ink fed per unit time of the liquid feed pump 23 may be set as appropriate according to the capacity of the intermediate tank 12 that can be damped and the amount of ink discharged per unit time of the recording head 7. Considering the delay time (for example, 0.1 to 2 seconds) until the film surface detection sensor 19 detects that ink replenishment is required and the force is supplied by the liquid supply pump 23, the following I like to meet a relationship.
- a supply valve 24 for restricting the inflow of ink from the main tank 11 to the sub tank 10 is provided in the middle of the ink supply pipe 9b.
- the supply valve 24 is, for example, an electromagnetic valve including a solenoid and a diaphragm (both not shown), and the valve is opened and closed by liquid flowing into and out of the diaphragm by opening and closing the solenoid. It is.
- the mechanism for restricting the inflow and outflow of ink is not limited to this, and various valves having other structures or other various mechanisms can be used.
- the inkjet printer 1 includes a display unit 28 as notification means for notifying the user when it is determined that there is no ink remaining in the main tank 11.
- the display unit 28 is configured by, for example, a liquid crystal display provided with a TFT (Thin Film Transister) or the like, and out of the main tanks 11 storing the ink of each color, is the remaining ink amount in the main tanks 11 out of deviation? Etc. are displayed.
- the display unit 28 may display conditions related to image recording and other various information.
- the recording medium P used in the present embodiment includes various papers such as plain paper, recycled paper, and glossy paper, various fabrics, various non-woven fabrics, etc., and ink absorptive properties such as resin, metal, and glass. Recording media P with various material strengths, such as those without, can be applied. Further, as the form of the recording medium P, various forms such as a roll form, a cut sheet form, and a plate form are applicable.
- the inkjet printer 1 includes a control unit 25 that controls each unit of the inkjet printer 1, and a power supply 26 that supplies power to the inkjet printer 1 is connected to the control unit 25.
- control unit 25 detects, as an electric signal, a detection result obtained by detecting how much the film surface of the damper film 17 is swollen inside the ink chamber 13 of the intermediate tank 12 from the film surface detection sensor 19. It will be sent. Based on this detection result, the control unit 25 determines whether or not the ink remains in the ink chamber 13 of the intermediate tank 12 and determines whether there is no ink remaining in the ink chamber 13. At this time, the liquid pump 23 is operated to supply the ink in the sub tank 10 to the intermediate tank 12. Damper film by film surface detection sensor 19 The film surface 17 is detected during image recording when the carriage 6 is moving at a constant speed. The carriage 6 moves at a constant moving speed in order to perform stable image recording when performing image recording while reciprocating on the platen 2.
- the movement speed of the carriage 6 is accelerated, or the carriage 6 is decelerated in order to change the movement direction of the carriage 6.
- the moving speed is not constant.
- the ink amount in the ink chamber 12 is suddenly changed due to forced suction of ink and empty ejection. Therefore, an accurate value cannot be expected even if the film surface of the damper film 17 is detected other than during image recording when the carriage 6 is moving at a constant speed.
- the detection of the film surface itself may be performed only at the time of image recording, or the detection of the film surface itself may be performed constantly or at predetermined intervals, and the control unit 25 detects the detection result at the time of image recording. It may be determined whether or not ink remains in the ink chamber 13 based only on the ink.
- control unit 25 determines that there is no ink in the ink chamber 13 of the intermediate tank 12 based on the signal sent from the film surface detection sensor 19, the control unit 25 operates the liquid feeding pump 23 as appropriate. Then, an appropriate amount of ink that can be stored in the ink chamber 13 is sent from the sub tank 10 to the ink chamber 13 of the intermediate tank 12, and the amount of ink stored in the ink chamber 13 of the intermediate tank 12 is kept constant. It has become.
- the detection result of the ink amount in each sub tank 10 is sent from the sub tank sensor 27 to the control unit 25 as an electric signal.
- the control unit 25 determines that the remaining ink level in the sub-tank 10 is less than or equal to the predetermined amount, the control unit 25 operates the supply valve 24 to open the supply valve 24 for a predetermined period of time.
- the time for opening the supply valve 24 is set in advance, for example, 10 seconds or 20 seconds, and the supply valve 24 is opened for the set time.
- the time for opening the supply valve 24 may be set according to the type of ink.
- the control unit 25 determines that there is no ink remaining in the main tank 11. The amount of ink remaining in the main tank 11 is determined as long as there is no change in the film surface position of the damper film 17 after the control unit 25 operates the liquid feed pump 23. It may be changed depending on various conditions such as ink type and ambient temperature.
- the ink in the intermediate tank 12 can be operated even if the liquid feed pump 23 is operated with a slower ink flow speed than when the viscosity of the ink is low.
- the time it takes for ink to reach the ink chamber 13 of the intermediate tank 12 after the liquid feed pump 23 operates, such as the time until ink reaches the chamber 13, depends on the viscosity of the ink. This is because there may be cases.
- control unit 25 controls the display unit 28 to determine which color of ink the ink remaining in the main tank 11 runs out. ! / Is displayed.
- control unit 25 controls the carriage drive mechanism 29 to reciprocate the carriage 6 in the main scanning direction, and repeats the conveyance and stop of the recording medium P in accordance with the operation of the carriage 6.
- the recording medium transport mechanism 30 is controlled to operate the transport rollers 3 and 4 so that P is transported intermittently in the transport direction X.
- control unit 25 operates the recording head 7 to heat the ink in the ink flow path of the recording head 7 to about 30 ° C. to 150 ° C., and the ink is 2 to 20 pl per dot.
- the droplets are ejected onto the recording medium P as fine droplets to form a predetermined image.
- control unit 25 controls the ultraviolet irradiation device 8 so that the ultraviolet light source power is also irradiated to the ink landed on the recording medium P.
- the carriage 6 When the carriage 6 reaches a predetermined position, the recording medium P is transported in the transport direction X by the transport rollers 3 and 4, and at the same time, the carriage 6 reciprocates in the main scanning direction. At this time, the ink flow path is compressed by applying a predetermined voltage to the piezo element of the recording head 7. As a result, the ink in the ink chamber 13 of the intermediate tank 12 is drawn into the ink flow path of the recording head 7 by this discharge force, and the ink of the required color is discharged based on the nozzle force predetermined image information. Further, the ejected ink is irradiated with ultraviolet rays from the ultraviolet irradiation device 8, whereby a predetermined image is recorded on the recording medium P.
- the ink stored in the ink chamber 13 of the intermediate tank 12 is sequentially supplied to the recording head 7, and the ink in the ink chamber 13 decreases.
- the damper film 17 stagnates toward the inside of the ink chamber 13 along with this.
- the coil panel 18 tries to push the damper film 17 back to the initial position by the repulsive force, thereby supplying the ink in the ink chamber 13 of the intermediate tank 12 and from the intermediate tank 12 to the recording head 7.
- the inside of the tube 9a is in a negative pressure state.
- the film surface position of the damper film 17 is detected at any time by the film surface detection sensor 19, and the detection result is sent to the control unit 25.
- the remaining amount of ink in the sub tank 10 is detected by the remaining amount detection sensor 19, and when the amount of ink in the sub tank 10 is smaller than a predetermined amount, the supply valve 24 is opened as needed. Thus, a required amount of ink is supplied from the main tank 11 to the sub tank 10 via the ink supply pipe 9b. Thus, the sub tank 10 is always in a state where a certain amount of ink is stored.
- the display unit 28 displays that there is no remaining ink in the main tank 11.
- ink remains in the main tank 11 by detecting the film surface position of the damper film 17 and grasping whether or not the intermediate tank 12 is replenished with ink. It is possible to detect whether the force is on. For this reason, the remaining amount of ink in the main tank 11 can be accurately detected with a simple configuration, and the replenishment timing of the ink in the main tank 11 can be properly grasped.
- the display unit 28 displays that there is no ink remaining in the main tank 11, the user can easily grasp the ink replenishment timing.
- the recording head 7 can be sequentially supplied with ink from the intermediate tank 12, and the ink supplied to the recording head 7.
- the effect of pressure loss in the ink supply pipe 9a can be minimized. Therefore, even when image recording is performed using high-viscosity ink, the ink can be guided to the nozzles of the recording head 7 by the discharging force of the recording head 7 and discharged.
- the damper film 17 formed of a flexible material is provided in the intermediate tank 12, and the damper film 17 is maintained at the initial position by the coil panel 18.
- the damper film 17 is maintained at the initial position by the coil panel 18.
- the sub tank 10 is provided in addition to the intermediate tank 12, and the ink in the main tank 11 is supplied to the intermediate tank 12 after being supplied to the sub tank 10.
- the sub tank 10 may not be provided, and the ink in the main tank 11 may be directly supplied to the intermediate tank 12.
- the supply valve 24 between the main tank 11 and the sub tank 10 is not necessary, and the apparatus configuration is simplified.
- the sub-tank 10 generally manages the recording head 7 and the ink supply pipe 9a so as to maintain a constant negative pressure state, and prevents the ink from leaking from the recording head 7 except during image recording.
- the negative pressure in the recording head 7 and the ink supply pipe 9a is maintained by the damper film 17 and the coil panel 18 of the intermediate tank 12 in this embodiment. For this reason, even if the sub-tank 10 is not provided, the ink does not leak from the nozzle of the recording head 7.
- the notification means is not limited to this.
- the main tank 11 can be provided to the user by providing a sound output unit to generate a warning sound, or providing a warning lamp to turn on the lamp. Let's let you know that there is no ink remaining.
- the inkjet printer 1 to which the inkjet printer 1 according to the present invention can be applied may be an on-demand type or a continuous-type! /, Misaligned recording head 7.
- a discharge method for example, an electromechanical conversion method (for example, a single cavity type, a double cavity type, a vendor type, a piston type, a shear mode type, a shared wall type, etc.), an electrothermal conversion method (for example, Thermal ink jet type, bubble jet (registered trademark) type), electrostatic suction type (for example, electric field control type, slit jet type, etc.) and discharge type (for example, spark jet type, etc.) It is possible to use a recording head 7 of the type.
- the force ink that performs image recording using ink that is cured by irradiating with ultraviolet rays is not necessarily limited to this.
- ultraviolet rays, electron rays, X-rays are used.
- the ink may be cured by irradiation with light other than ultraviolet rays such as electromagnetic waves such as visible rays and infrared rays.
- a polymerizable compound that is polymerized and cured with light other than ultraviolet light and a photoinitiator that initiates a polymerization reaction between the polymerizable compounds with light other than ultraviolet light are applied to the ink.
- a light source that irradiates the light is used instead of the ultraviolet light source.
- an ink that is cured and fixed without irradiating light may be used. In this case, it is not necessary to provide an ultraviolet irradiation device.
- the ink jet printer 1 causes the recording head 7 mounted on the carriage 6 to reciprocate in the main scanning direction, and from the recording head 7 while transporting the recording medium P in the transport direction X.
- the power of the ink jet printer 1 of the serial head type that forms an image by ejecting ink As the ink jet printer 1 according to the present invention, the ink is ejected from the recording head fixed to the printer body and the recording medium is conveyed. It may be a line head type ink jet printer that forms an image.
- the second embodiment is different from the first embodiment only in the configuration of the remaining amount detecting means for detecting the ink amount in the intermediate tank. Therefore, in the following, the configuration of the remaining amount detecting means will be described in particular. To do.
- the inkjet printer 31 includes a recording head 32 that ejects ink, a main tank 35 that supplies ink to the recording head 32, and a sub-tank that temporarily stores ink sent from the main tank 35. And 34.
- the recording head 32 and the sub tank 34 and the sub tank 34 and the main tank 35 are connected by ink supply pipes 33a and 33b so that ink is sequentially supplied to the recording head 32.
- an ink chamber which stores ink therein
- An intermediate tank 36 (not shown) is provided.
- An opening (not shown) is formed on one side surface of the ink chamber of the intermediate tank 36, and a damper film (not shown) having a flexible film force such as a polyethylene film is stretched in the opening.
- a damper film (not shown) having a flexible film force such as a polyethylene film is stretched in the opening.
- the damper film is pressed by the ink and squeezes outward, and conversely, when the amount of ink in the intermediate tank 36 decreases due to the ink flowing out toward the recording head. Along with it, it has become soothing inside.
- a coil spring (not shown) as an elastic member is provided on the wall surface inside the ink chamber and facing the opening so that one end thereof is in contact with the damper film.
- the coil panel supports the damper film 11 at a predetermined initial position when the ink flows into the ink chamber of the intermediate tank 36.
- the ink flowing out from the intermediate tank 36 is detected as a remaining amount detecting means for detecting the remaining amount of ink in the intermediate tank.
- a pressure sensor 37 for detecting pressure fluctuation is provided.
- the pressure sensor 37 is formed by, for example, forming a bridge circuit on a silicon substrate, and using a change in electrical resistance when tension or compression is applied to a semiconductor crystal, to determine a resistance value that varies with pressure.
- ceramic piezoelectric elements polymer piezoelectric materials such as polyvinylidene fluoride, single crystal piezoelectric materials such as lithium niobate, magnetostrictive flight, etc.
- Magnetostrictive element that generates pressure magnetism that can be electrically converted
- the change in pressure can be grasped by detecting the change in electrical resistance using a piezoelectric material or the like that electrically converts strain, such as a child or a strain gauge.
- the pressing force for the ink to flow toward the recording head 32 is increased, and the force is applied to the ink supply pipe 33a between the intermediate tank 36 and the recording head 32.
- the pressure applied increases.
- the remaining amount of ink in the intermediate tank 36 decreases, the pressing force for the ink to flow toward the recording head 32 is weakened, and the ink supply pipe between the intermediate tank 36 and the recording head 32 is weakened.
- the pressure applied to 33a is reduced.
- the value detected by the pressure sensor 37 is It is possible to determine whether the ink remaining in the inter-tank 36 has run out.
- a liquid feed pump 38 for feeding ink is provided between the intermediate tank 36 and the sub tank 34, and it is determined that the amount of ink in the intermediate tank 36 has become a certain amount or less. In this case, the ink stored in the sub tank 34 is forcibly sent!
- a supply valve 39 for restricting the inflow of ink from the main tank 35 to the sub tank 34 is provided.
- the inkjet printer 31 includes a display unit (not shown) as in the first embodiment, and appropriately displays that the remaining amount of ink in the main tank 35 has run out.
- the ink jet printer 31 in the present embodiment includes a control unit (not shown) that is substantially the same as in the first embodiment, and the control unit includes a pressure sensor 37, a liquid feed pump 38, a supply valve 39, And the display unit is operated.
- the carriage 6 is driven and ink is ejected from the recording head 32 based on a predetermined image signal to form a desired image.
- An image recording operation is performed based on a predetermined image signal, and ink is ejected from the recording head 32.
- ink is ejected from the recording head 32.
- the ink stored in the ink chamber of the intermediate tank 36 is supplied to the recording head 32 in sequence.
- stagnation occurs inside the damper film force ink chamber.
- the coil panel attempts to push the damper film back to the initial position by the repulsive force, which causes the ink chamber in the intermediate tank 36 and the ink supply pipe 33a from the intermediate tank 36 to the recording head 32 to be negative. It becomes pressure.
- a change in pressure applied to the ink supply pipe 33a between the intermediate tank 36 and the recording head 32 is detected by the pressure sensor 37, and when the pressure applied to the ink supply pipe 33a falls below a certain pressure, It is determined that the amount of ink in the intermediate tank 36 is equal to or less than a predetermined amount, and an amount of ink that can be stored in the ink chamber is sent from the sub tank 34 by the liquid feed pump 38.
- the pressure applied to the ink supply pipe 33a between the intermediate tank 36 and the recording head 32 increases, and the change in the pressure is detected by the pressure sensor 37.
- the control unit may stop the liquid feeding by the liquid feeding pump 38 when a predetermined amount of ink is fed, or the pressure applied to the ink supply pipe 33a becomes a certain level or more. When the pressure sensor 37 detects this, liquid feeding by the liquid feeding pump 38 may be stopped.
- the ink remaining amount of the main tank 35 is reduced by a simple configuration in which the pressure sensor 37 is provided in the ink supply pipe 33a between the intermediate tank 36 and the recording head 32. It can be detected accurately, and it is possible to properly grasp the ink replenishment timing of the main tank 35.
- the display unit displays that there is no ink remaining in the main tank 35, the user can easily grasp the ink replenishment timing.
- the intermediate tank 36 is provided in the vicinity of the recording head 32,
- the recording head 32 can be sequentially supplied with ink from the intermediate tank 36, and the influence of the pressure loss of the ink supplied to the recording head 32 in the ink supply pipe 33a can be minimized. For this reason, even when image recording is performed using high-viscosity ink, the ink can be guided to the nozzles of the recording head 32 by the ejection force of the recording head 32 and ejected.
- the intermediate tank 36 is provided with a damper film formed of a flexible material, and the damper film is maintained at the initial position by the coil panel.
- a negative pressure state is generated in the ink, whereby the nozzle force of the recording head 32 can be prevented from leaking ink.
Landscapes
- Ink Jet (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05765079A EP1769921B1 (en) | 2004-07-07 | 2005-06-27 | Inkjet printer |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004200363A JP2006021383A (ja) | 2004-07-07 | 2004-07-07 | インクジェットプリンタ |
JP2004-200363 | 2004-07-07 | ||
JP2004-200338 | 2004-07-07 | ||
JP2004200338A JP2006021380A (ja) | 2004-07-07 | 2004-07-07 | インクジェットプリンタ |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006006380A1 true WO2006006380A1 (ja) | 2006-01-19 |
Family
ID=35540869
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/011745 WO2006006380A1 (ja) | 2004-07-07 | 2005-06-27 | インクジェットプリンタ |
Country Status (3)
Country | Link |
---|---|
US (1) | US7370923B2 (ja) |
EP (1) | EP1769921B1 (ja) |
WO (1) | WO2006006380A1 (ja) |
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JP2010509109A (ja) * | 2006-11-14 | 2010-03-25 | ネーデルランデ オルガニサティー ヴール トゥーヘパストナツールウェテンスハペライク オンデルズーク テーエヌオー | 定流量高圧印刷システム |
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Also Published As
Publication number | Publication date |
---|---|
US7370923B2 (en) | 2008-05-13 |
EP1769921A4 (en) | 2007-11-14 |
EP1769921B1 (en) | 2012-02-29 |
EP1769921A1 (en) | 2007-04-04 |
US20060007254A1 (en) | 2006-01-12 |
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