JP2007230034A - Droplet ejection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To collect ink and a processing liquid without blending them and to prevent nozzles from being dogged by reaction of ink and a processing liquid. <P>SOLUTION: A head 34L for a processing liquid which ejects a processing liquid and heads for ink 34Y, 34M, 34C and 34K which eject each color ink are arranged along with a conveyance direction of a conveyance belt 32. In a side section of the head 34L for a processing liquid, a recovery device 60L for a processing liquid which carries out electrostatic attraction of processing liquid mist is prepared at an opposite side of the head 34Y for ink. In a side section of each head for ink 34Y, 34M, 34C and 34K, recovery devices for ink 60Y, 60M, 60C and 60K which carry out electrostatic attraction of ink mist are prepared respectively at an opposite side of the head 34L for a processing liquid. To the recovery device 60L for a processing liquid, and the recovery devices for ink 60Y, 60M, 60C and 60K, predetermined power voltage is impressed from a power source 66. Thereby, a processing liquid and ink are collected in a different direction, and it is inhibited that they are blended and reacted with each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to, for example, a droplet discharge apparatus that discharges droplets as typified by an ink jet recording method and performs image recording, and more particularly, a first liquid and a second liquid discharged from a first liquid head. The present invention relates to a droplet discharge device that reacts with a second liquid discharged from a head for use.

  2. Description of the Related Art Conventionally, there is an ink jet recording apparatus as a liquid droplet ejecting apparatus that ejects liquid droplets from a plurality of nozzles and prints on a recording medium such as paper. The ink jet recording apparatus is small, inexpensive, and quiet. It has advantages and is widely available commercially. In particular, piezo inkjet systems that eject ink droplets by changing the pressure in the pressure chamber using piezoelectric elements and thermal inkjet recording devices that eject ink droplets by expanding the ink by the action of thermal energy are high-speed printing. It has many advantages such as high resolution.

  In such an ink jet recording apparatus, there is a case in which a processing liquid is used for the purpose of promoting drying of ink and improving image quality as the image forming speed increases. The processing liquid and ink are ejected from each recording head to the paper as necessary, and the purpose is achieved by causing a reaction on the paper. In addition, in order to achieve high image quality, the density of the nozzles of the recording head is increased to reduce the number of ejected ink droplets (see, for example, Patent Document 1).

  However, a small amount of ink droplets and processing liquid that have been reduced in volume are not deposited on the paper as mist due to the air resistance from the recording head to the paper or the airflow generated when the paper is transported. May drift in the plane. The ink mist drifting inside the machine adheres to the recording head that discharges the processing liquid, or the mist of processing liquid adheres to the recording head that discharges the ink, so that a reaction occurs on the nozzle surface of each recording head, and the nozzle opening May block the part.

  On the other hand, a dummy jet (preliminary discharge) is indispensable in order to realize stable discharge in an aqueous inkjet recording apparatus. The reason is that the ink that is not used for printing thickens or solidifies due to evaporation of ink moisture from the nozzle surface. The frequency of the dummy jet varies depending on the characteristics of the recording head and the ink, but one jet is required every several seconds to several tens of seconds.

In an inkjet recording apparatus using a recording head having the same length as the paper width, the following method is disclosed as a dummy jet method.
(1) The maintenance station enters the lower part of the recording head for each dummy jet and performs a dummy jet.
(2) Dummy jet onto a paper transport belt that transports the paper, and remove the ink by the cleaning means of the paper transport belt.

  However, the method (1) inevitably lowers productivity, and there is a problem that high-speed printing performance, which is the greatest feature of a long recording head, is impaired. Further, the method (2) is difficult to completely remove ink. For example, when an electrostatic adsorption method is adopted as a paper transport mechanism, a slight amount of residual ink may cause electrical characteristics (surface resistance) of the paper transport belt. As a result, there is a possibility that the electrostatic adsorption performance is lowered. Even if complete cleaning can be realized, a dedicated cleaning means is required, which increases the cost of the apparatus.

  Further, in an ink jet recording apparatus using ink and processing liquid, ink mist generated during dummy jet adheres to the processing liquid recording head, or processing liquid mist adheres to the ink recording head. There is a problem that a reaction occurs on the nozzle surface and the nozzle opening is blocked.

  On the other hand, as a mechanism for collecting flying ink droplets, for example, an air outlet is provided on one side of the recording head, an air inlet is provided on the other side, and the outlet and the inlet are connected by a duct. A configuration in which a fan is provided to circulate air is disclosed (for example, see Patent Document 2). In this configuration, when performing a dummy jet of ink, the fan is driven to create an air flow on the surface of the recording head, and the ink deflected in the flight direction is collected by the absorber in the duct.

However, the configuration described in Patent Document 2 cannot be used in a two-component printing system that uses ink and processing liquid because the ink and processing liquid are mixed and solidified to close the nozzle opening. Further, in this configuration, since it operates only at the time of dummy jet, it cannot serve as a mechanism for collecting mist generated by normal discharge. If the recovery mechanism is operated even in the normal printing mode because it also serves as a mist recovery mechanism, ink droplets that are originally desired to fly straight are deflected, and the landing accuracy deteriorates.
Japanese Patent Laid-Open No. 11-10858 JP 11-334106 A

  The present invention has been made in view of the above problems, and provides a droplet discharge device capable of suppressing the clogging of a nozzle opening due to a reaction between ink and a mist of a processing liquid at a low cost. With the goal.

  In order to achieve the above object, the invention described in claim 1 includes a first liquid recording head that discharges a first liquid and a second liquid recording head that discharges a second liquid. A droplet discharge device that mixes and reacts one liquid and the second liquid on a recording medium, wherein the first liquid drops from the first liquid recording head and the second liquid from the second liquid recording head. A first liquid recovery mechanism for recovering all or part of the first liquid droplets after discharging the droplets and before adhering to the transporting means for transporting the recording medium or the recording medium; and the second liquid And a second liquid recovery mechanism that recovers all or part of the droplets in a direction different from that of the first droplet.

  In the first aspect of the invention, the first liquid droplet is ejected from the first liquid recording head, and the second liquid droplet is ejected from the second liquid recording head. Before the ejected first droplet and second droplet adhere to the conveying means or the recording medium, all or a part of the first droplet is recovered by the first liquid recovery mechanism, and the second droplet All or a part is collected in a direction different from the first droplet by the second liquid collecting mechanism. This suppresses the mist of the first droplet from adhering to the second liquid recording head and the mist of the second liquid droplet from adhering to the first liquid recording head. For this reason, the malfunction by which a nozzle opening part is obstruct | occluded by reaction with a 1st liquid and a 2nd liquid is suppressed.

  According to a second aspect of the present invention, in the liquid droplet ejection device according to the first aspect, all the recovery of the first liquid droplet and the second liquid droplet is in a dummy jet mode different from normal ejection. It is characterized by that.

  In the second aspect of the invention, even in the dummy jet mode, all of the first liquid droplets are recovered by the first liquid recovery mechanism, and all of the second liquid droplets are recovered by the second liquid recovery mechanism. And collected in a different direction. As a result, the problem that the nozzle openings are blocked by the reaction between the first liquid and the second liquid on the nozzle surfaces of the first liquid recording head and the second liquid recording head is suppressed.

  According to a third aspect of the present invention, in the liquid droplet ejection apparatus according to the first or second aspect, the ejection speed of the first liquid droplet or the second liquid droplet is set to the first liquid recording head or the It has a control means that can be varied by changing the voltage waveform applied when the recording head for the second liquid is driven.

  According to the third aspect of the present invention, the discharge speed of the first liquid droplet or the second liquid droplet is changed by changing the voltage waveform applied when the first liquid recording head or the second liquid recording head is driven by the control means. Is variable. As a result, the discharge speed of the first liquid droplet and the second liquid droplet can be reduced, and the mist of the first liquid and the second liquid can be easily and reliably produced by the first liquid recovery mechanism and the second liquid recovery mechanism. Can be recovered.

  According to a fourth aspect of the present invention, in the liquid droplet ejection apparatus according to the third aspect, the dummy jet mode is configured such that the ejection speed of the first liquid droplet or the second liquid droplet is slower than a normal ejection speed. It is characterized by doing.

  In the invention according to claim 4, the dummy jet mode makes the discharge speed of the first droplet or the second droplet slower than the normal discharge speed, so that the mist generated during the dummy jet can be easily and reliably recovered. It becomes possible to do.

  According to a fifth aspect of the present invention, in the liquid droplet ejection apparatus according to any one of the first to fourth aspects, the first liquid recording head or the second liquid recording head faces the vicinity. In the dummy jet mode, the first droplet or the second droplet ejected by applying an electric field is decomposed.

  According to the fifth aspect of the present invention, an opposing electrode is disposed in the vicinity of the first liquid recording head or the second liquid recording head, and an electric field is applied in the dummy jet mode. As a result, the first droplet or the second droplet ejected in the dummy jet mode is decomposed and atomized. The atomized first liquid or second liquid is recovered by the first liquid recovery mechanism or the second liquid recovery mechanism. By atomizing the first droplet or the second droplet, it is possible to collect more reliably than when collecting a large droplet as it is.

  According to a sixth aspect of the present invention, in the liquid droplet ejection apparatus according to any one of the first to fifth aspects, the transport unit includes a transport belt, and the transport is performed in the dummy jet mode. Blowing means for generating an air flow from the opening formed in the belt toward the first liquid recording head or the second liquid recording head is provided.

  In the sixth aspect of the present invention, the first liquid droplet or the second liquid is generated by generating an air flow from the opening of the conveyance belt toward the first liquid recording head or the second liquid recording head by the blowing unit. The discharge speed of the drops is slow. This makes it possible to collect the first droplet or the second droplet easily and reliably.

  According to a seventh aspect of the present invention, in the liquid droplet ejection apparatus according to any one of the first to sixth aspects, the first liquid recovery mechanism and the second liquid recovery mechanism include the first liquid recovery mechanism and the second liquid recovery mechanism. Adsorption that electrostatically adsorbs the first droplet or the second droplet when a voltage is applied between the one-liquid recording head and the second-liquid recording head. It is a member.

  According to the seventh aspect of the present invention, the adsorbing member is provided on the outer side between the first liquid recording head and the second liquid recording head, and the first droplet is applied by applying a voltage. And the second droplet are electrostatically attracted to the attracting member. As a result, the first droplet and the second droplet can be prevented from mixing and reacting, and the first droplet and the second droplet can be recovered at low cost without complicating the recovery mechanism.

  According to an eighth aspect of the present invention, in the liquid droplet ejection device according to any one of the first to sixth aspects, the first liquid recovery mechanism and the second liquid recovery mechanism include the first liquid recovery mechanism. The first liquid recording head and the second liquid recording head are provided on the outer lateral sides, respectively, and have a duct that generates negative pressure and sucks the first liquid droplet or the second liquid droplet. It is said.

  According to the eighth aspect of the present invention, ducts for generating a negative pressure and sucking droplets are provided on the outer sides of the first liquid recording head and the second liquid recording head, respectively. One and second droplets are collected in each duct. As a result, the first droplet and the second droplet can be prevented from mixing and reacting, and the first droplet and the second droplet can be recovered at low cost without complicating the recovery mechanism.

  According to a ninth aspect of the present invention, in the droplet discharge device according to any one of the first to fifth aspects, the first liquid recovery mechanism or the second liquid recovery mechanism includes the first liquid recovery mechanism. A duct portion provided between the recording head for one liquid and the recording head for the second liquid, and disposed on the upstream side of the duct portion for blowing air toward the conveying means or the recording medium; A fan, a first duct into which the airflow generated toward the first liquid recording head by the air is introduced, and an airflow generated toward the second liquid recording head from the air are introduced. And a second duct.

  According to the ninth aspect of the present invention, the fan is provided on the upstream side of the duct portion between the first liquid recording head and the second liquid recording head, and the duct portion is directed toward the conveying means or the recording medium. Air is blown. The blown air collides with the conveying means or the recording medium and branches in different directions, and air flows in different directions are generated at the opposing portions of the first liquid recording head and the second liquid recording head. The airflow generated toward the first liquid recording head is introduced into the first duct, and the airflow generated toward the second liquid recording head is introduced into the second duct. For this reason, the mists of the first droplet and the second droplet are respectively collected in the first duct and the second duct by the flow of air in different directions. Thereby, it can suppress that the mist of a 1st droplet and a 2nd droplet mixes and reacts.

  According to a tenth aspect of the present invention, in the droplet discharge device according to the ninth aspect, a filter is provided between the first duct, the second duct, and the fan.

  In a tenth aspect of the present invention, a filter is provided between the first duct and the second duct and the fan, and the mist of the first droplet and the second droplet is collected by the filter. Thereby, the air from which the mist has been removed can be circulated by the fan.

  According to an eleventh aspect of the present invention, in the droplet discharge device according to any one of the second to tenth aspects, the conveyance belt for conveying a sheet and the first liquid recording in the dummy jet mode. It is characterized in that it has moving means for widening the distance between the head and the recording head for the second liquid than during normal ejection.

  In the invention according to the eleventh aspect, in the dummy jet mode, the distance between the conveying belt, the first liquid recording head, and the second liquid recording head is widened by the moving means as compared with that during normal ejection. Thereby, it becomes easy to collect the mist of the droplet, and it is possible to more reliably prevent the droplet mist from adhering to the conveying belt.

  According to a twelfth aspect of the present invention, in the liquid droplet ejection apparatus according to any one of the first to eleventh aspects, the first liquid is ink and the second liquid is a processing liquid. It is characterized by.

  In the invention according to the twelfth aspect, the ink and the treatment liquid can be collected without being mixed, and blockage of the nozzle openings of the ink head and the treatment liquid head can be suppressed.

  According to the present invention, since the first droplet and the second droplet can be collected without mixing, it is possible to prevent the nozzle opening from being blocked due to the reaction between the first liquid and the second liquid. Further, it is not necessary to use a dedicated cleaning mechanism, and low cost can be realized.

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

  First, an overall configuration of an ink jet printer which is a droplet discharge device of the present invention will be outlined. FIG. 1 shows a schematic configuration of an inkjet printer 10 according to the first embodiment of the present invention.

  As shown in FIG. 1, the inkjet printer 10 includes a paper feed cassette 12 in which paper (recording medium) P is accommodated. A feed roll 14 that takes out the paper P from the inside of the paper feed cassette 12 is disposed at the top of the paper feed cassette 12 on the front end side (left end side in FIG. 1).

  Further, a first transport path 18 is provided that extends from the leading end of the paper feed cassette 12 and reaches the recording unit 16 that records an image on the paper P. The first transport path 18 is provided with a plurality of first transport roll pairs 20 that sandwich and transport the paper P to the recording unit 16.

  Furthermore, a second transport path 24 is provided that extends upward from the recording unit 16 and reaches the discharge tray 22 that stores the paper P on which an image is recorded. A plurality of second transport roll pairs 26 that transport the paper P to the discharge tray 22 are provided in the second transport path 24. A reverse conveyance path 36 for duplex printing is connected from the second conveyance path 24 to the first conveyance path 18.

  With the above configuration, the paper P taken out from the paper feed cassette 12 by the feed roll 14 is transported through the first transport path 18 by the plurality of transport roll pairs 20 and sent to the recording unit 16 for image recording. The paper on which the image has been recorded is transported through the second transport path 24 by a plurality of transport roll pairs 26 and is discharged to the discharge tray 22. When performing double-sided printing, the paper on which single-sided printing has been performed is transported from the second transport path 24 to the first transport path 18 via the reverse transport path 36 and sent again to the recording unit 16 to perform image recording. Is called. As described above, a series of image recording is performed.

  Next, the configuration of the recording unit 16 will be described.

  The recording unit 16 includes a drive roll 28 disposed on the upstream side in the sheet conveyance direction and an endless conveyance belt 32 wound around a driven roll 30 disposed on the downstream side. 1 is configured to circulate (rotate) in the direction of arrow A (clockwise). In addition, a charging roll 38 that is in sliding contact with the transport belt 32 from the front side is disposed on the drive roll 28. The charging roll 38 presses the paper P against the transport belt 32, and charges the paper P to attract the paper P onto the transport belt 32 by electrostatic attraction.

  An ink jet recording head 34 is disposed above the transport belt 32. The inkjet recording head 34 has a long shape in which the effective recording area is equal to or larger than the width of the paper P (the length in the direction orthogonal to the transport direction), promotes ink fixing, and improves image density and water resistance. Processing liquid head 34L that discharges the processing liquid for the purpose of, and each of the four inks that respectively discharge yellow (Y), magenta (M), cyan (C), and black (K) inks The heads 34Y, 34M, 34C, and 34K are arranged along the transport direction so that a full-color image can be recorded.

  The ink jet recording head 34 faces the flat portion 32F of the transport belt 32, and the facing region is an ejection region where ink droplets and processing liquid are ejected from the ink jet recording head 34. The paper P transported through the first transport path 18 is held by the transport belt 32, reaches the discharge region, and faces the ink jet recording head 34. Treatment liquid is attached.

  In this recording method using the ink jet recording head 34, an image is formed by ejecting ink and a treatment liquid having an action of aggregating and / or insolubilizing the components of the ink onto the paper P so as to contact each other. . When the ink and the treatment liquid come into contact with each other, the ink components are aggregated and / or insolubilized, resulting in a recording method that is excellent in color development, solid portion unevenness, optical density, bleeding, intercolor bleeding, and drying time. As long as the ink and the treatment liquid are in contact with each other, they may be applied so as to be adjacent to each other or may be applied so as to cover them.

  Further, above the ink jet recording head 34, the ink tanks 40Y, 40M, 40C, and 40K that supply ink to the ink heads 34Y, 34M, 34C, and 34K, and the processing liquid that supplies the processing liquid to the processing liquid head 34L. A tank 40L is provided.

  The ink heads 34Y, 34M, 34C, 34K and the treatment liquid head 34L are connected to the recording head controller 50. The recording head control unit 50 determines, for example, the ejection timing of ink droplets and processing liquid and the ink ejection port (nozzle) to be used according to the image information, and sends the drive signals to the ink heads 34Y, 34M, 34C, 34K and The ink jet recording head 34 is controlled by inputting to the treatment liquid head 34L.

  The recording head control unit 50 also sets the ejection timing of the inkjet recording head 34 and the ink ejection port (nozzle) to be used even when a dummy jet (preliminary ejection performed to suppress nozzle clogging due to ink coagulation or the like) is performed. Control. The inkjet printer 10 is provided with system control means (not shown) for controlling the operation of the entire apparatus.

  As shown in FIGS. 1 and 2, the ink jet printer 10 having the above-described configuration has a processing liquid for the side of the processing liquid head 34L opposite to the ink heads 34Y, 34M, 34C, 34K. A processing liquid recovery device 60L that recovers part or all of the processing droplets discharged from the head 34L is provided. Further, the ink heads 34Y, 34M, 34C are disposed on the side portions of the ink heads 34Y, 34M, 34C, 34K (between the ink heads 34Y, 34M, 34C, 34K) opposite to the treatment liquid head 34L. , 34K, ink collection devices 60Y, 60M, 60C, and 60K for collecting all or part of yellow, magenta, cyan, and black ink droplets are provided.

  As shown in FIG. 2, the treatment liquid collection device 60 </ b> L and the ink collection devices 60 </ b> Y, 60 </ b> M, 60 </ b> C, 60 </ b> K have the same configuration, and are replaceable conductive filters disposed at positions facing the conveyance belt 32. A unit 62 and an electrode 64 on the back side thereof are provided. A power source 66 for applying a DC voltage is connected to the electrode 64. In the present embodiment, the end face of the conductive filter unit 62 recedes from the transport belt 32 with respect to the ejection surfaces of the ink heads 34Y, 34M, 34C, 34K and the treatment liquid head 34L. You may arrange | position so that it may become (the same space | interval with respect to the conveyance belt 32).

  In the normal print mode, fine droplets (processing droplets and ink droplets) are ejected from the nozzles of the processing liquid head 34L and the ink heads 34Y, 34M, 34C, and 34K, and an image is recorded on the paper P. At that time, a portion corresponding to the tail of the droplet becomes a fine mist. In the treatment liquid recovery device 60L and the ink recovery devices 60Y, 60M, 60C, and 60K, a potential difference is generated between the conductive filter unit 62 and the mist by applying a DC voltage to the electrode 64, which is caused by electrostatic force. Mist is adsorbed. As a result, the problem that the mist of the droplets contaminates the paper P, the conveyance belt 32, and further the entire interior of the inkjet printer 10 is reduced.

  Further, when the treatment liquid and the ink are mixed, solidification occurs, and there is a possibility that a desired mist collecting ability cannot be obtained. Therefore, as shown in FIG. 2, the treatment liquid recovery device 60 for the treatment liquid is disposed so as not to be adjacent to the other ink heads 34Y, 34M, 34C, 34K and the ink recovery devices 60Y, 60M, 60C, 60K. To do. As a result, the mist of the processing liquid droplets from the processing liquid head 34L and the mists of the ink droplets from the ink heads 34Y, 34M, 34C, 34K and the processing liquid recovery device 60L disposed on the opposite side and the ink With the collection devices 60Y, 60M, 60C, and 60K, they are collected in different directions. For this reason, it is suppressed that a process liquid and an ink mix and solidify, and malfunctions, such as obstruct | occluded a nozzle and the electroconductive filter unit 62, are reduced.

  3 to 5 show examples in which droplets (processing droplets and ink droplets) ejected in the dummy jet mode are collected by the treatment liquid collection device 60L and the ink collection devices 60Y, 60M, 60C, and 60K. ing.

  The recording head control unit 50 switches the voltage waveform to be applied to the drive elements of the processing liquid head 34L and the ink heads 34Y, 34M, 34C, and 34K between the dummy jet mode and the normal print mode. And ink drop). In the normal print mode, a sufficient droplet speed (about 10 m / s to several tens of m / s) is applied to the ejected droplets to land the droplets on the paper P, thereby forming an image. On the other hand, in the dummy jet mode, the voltage waveform is changed so that the droplet speed of the ejected droplets is slow (several tens of cm / s to several m / s). Then, the droplets with a small momentum are sucked and collected by the suction force of the treatment liquid collection device 60L and the ink collection devices 60Y, 60M, 60C, 60K.

  The dummy jet may be performed while printing is paused (inter-paper interval) or may be performed at an arbitrary timing during printing.

  The switching of the drive voltage waveform and the drop speed is changed, for example, as shown in FIG. 4 in the normal print mode and in FIG. 5 in the dummy jet mode. Here, FIGS. 4A and 5A show driving voltage waveforms applied to the driving elements, FIGS. 4B and 5B show the droplet velocity at the nozzle portion, and FIG. C) and FIG. 5C show the manner in which the droplet L is ejected.

  As shown in FIG. 4A, in the normal print mode, a voltage waveform is input in synchronization with the natural period of the ejector. Thereby, as shown in FIGS. 4B and 4C, the volume and the speed of the droplet L are adjusted to desired values. As shown in FIG. 5A, in the dummy jet mode, the amplitude of the voltage waveform is made smaller than that in the normal print mode, and the switching timing is also changed. As a result, as shown in FIGS. 5B and 5C, the droplet speed of the droplet L is decreased. By such control, the droplets can be collected by the treatment liquid collection device 60L and the ink collection devices 60Y, 60M, 60C, and 60K in the dummy jet mode. Although the graphs of FIGS. 4 and 5 are calculated by an equivalent circuit simulation, it is confirmed that the discharge mode shown in FIGS. 4C and 5C is obtained by actually performing a discharge experiment.

  According to the above configuration, since it is not necessary to eject droplets onto the maintenance station, productivity is not impaired. Further, since the conveyor belt 32 is not soiled, a dedicated cleaning mechanism is not required, and the apparatus cost can be reduced.

  The graphs in FIGS. 4 and 5 are examples of an ink jet head that employs a piezo actuator as a drive element. However, even in a thermal ink jet printer that uses a heating element, the voltage or length of the applied pulse waveform can be changed. A similar effect can be realized.

  Next, a processing liquid recovery device and an ink recovery device used in an ink jet printer according to a second embodiment of the present invention will be described.

  In addition, the same code | symbol is attached | subjected to the member same as embodiment shown in FIG.1 and FIG.2, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 6, the ink jet printer is provided with a processing liquid recovery device 80 and an ink recovery device 82 so as to surround the processing liquid head 34L and the ink heads 34Y, 34M, 34C, and 34K, respectively. Yes. The processing liquid recovery device 80 includes a casing 83 that accommodates the processing liquid head 34L. The processing liquid recovery device 80 is located on the side of the processing liquid head 34L in the casing 83, on the opposite side of the ink recovery device 82. A duct 84 through which air passes is provided. A suction fan 88 is provided on the upper portion of the housing 83, and a guide portion 86 for guiding air from the duct 84 is provided between the suction fan 88 and the housing 83. A suction unit 90 that sucks the sucked mist is provided above the suction fan 88.

  The ink recovery device 82 includes a casing 91 that accommodates the ink heads 34Y, 34M, 34C, and 34K. The ink recovery device 82 includes ink between the ink heads 34Y, 34M, 34C, and 34K in the casing 91 and the ink. Four ducts 92 are provided on the side of the head 34K (downstream side in the transport direction). A suction fan 96 is provided on the upper portion of the housing 91, and a guide portion 94 is provided between the suction fan 96 and the housing 91 so as to cover all the ducts 92. A suction unit 98 that sucks the sucked mist is provided on the suction fan 96.

  In such a treatment liquid recovery apparatus 80, the treatment liquid mist discharged from the treatment liquid head 34 </ b> L enters the duct 84 on the side opposite to the ink heads 34 </ b> Y, 34 </ b> M, 34 </ b> C, 34 </ b> K by the air suction force of the suction fan 88. Sucked. The air containing the processing liquid mist that has passed through the duct 84 is guided to the guide portion 86, and the processing liquid mist in the air is collected by the adsorption unit 90. In the ink recovery device 82, the ink mist discharged from the ink heads 34Y, 34M, 34C, and 34K is sucked into the duct 92 on the opposite side of the processing liquid head 34L by the air suction force of the suction fan 96. . The air containing the ink mist that has passed through the duct 92 is guided to the guide portion 94, and the ink mist in the air is collected by the suction unit 98.

  As a result, the problem that the mist of liquid droplets contaminates the paper P, the conveyance belt 32, and the entire interior of the ink jet printer is reduced. In addition, since the treatment liquid mist and the ink mist are collected in different directions, the treatment liquid and the ink are prevented from being mixed and solidified, and problems such as blocking the nozzle are reduced.

  FIG. 7 shows a treatment liquid recovery apparatus 110 used in the ink jet printer according to the third embodiment of the present invention.

  The processing liquid recovery device 110 is disposed in the vicinity of the processing liquid head 34L, and an elongated electrode 112 is provided substantially parallel to the longitudinal direction of the processing liquid head 34L. The electrode 112 is connected to a power source 114, and a DC voltage is applied. A gutter 116 is provided so as to surround the electrode 112, and the opening of the gutter 116 faces the nozzle 35 of the treatment liquid head 34L. One end of a recovery pipe 118 is connected to the gutter 116, and the other end of the recovery pipe 118 is drawn into the waste tank 120. A fan 122 that blows airflow toward the electrode 112 is provided above the electrode 112.

  In such a treatment liquid recovery apparatus 110, a potential difference is generated between the electrode 112 to which a voltage is applied and the mist of the treatment droplet, and the mist is adsorbed by electrostatic force. The treatment droplets collected on the electrode 112 are collected from the gutter 116 through the collection pipe 118 to the waste tank 120 by the air flow from the fan 122. In the above example, the treatment liquid recovery device 110 has been described. However, an ink recovery device having the same configuration can be provided in the vicinity of each ink head 34Y. Thereby, it can collect | recover, respectively, without mixing a process liquid and an ink.

  Next, a processing liquid and ink recovery apparatus 130 used in the ink jet printer according to the fourth embodiment of the present invention will be described.

  In addition, the same code | symbol is attached | subjected to the member same as embodiment shown in FIG.1 and FIG.2, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 8, the recovery device 130 includes a fan 132 that generates an air flow from between the processing liquid head 34 </ b> L and the ink head 34 </ b> Y toward the transport belt 32. A duct 134 that guides the airflow from the fan 132 toward the transport belt 32 is provided between the processing liquid head 34L and the ink head 34Y on the downstream side in the blowing direction of the fan 132.

  A guide portion 136 is disposed at the upstream end of the treatment liquid head 34L with respect to the conveyance direction of the conveyance belt 32 so as to cover the rear surface from the side surface of the treatment liquid head 34L. A duct 137 that branches off from the duct 134 and returns the airflow that passes between the treatment liquid head 34 </ b> L and the conveyor belt 32 to the back side of the fan 132 is formed inside the guide portion 136. A guide portion 138 is disposed at the downstream end of the ink heads 34Y, 34M, 34C, and 34K so as to cover the back surface from the side surface of the ink heads 34Y, 34M, 34C, and 34K. Inside 138, a duct 139 is formed to return the airflow passing between the ink heads 34Y, 34M, 34C, 34K and the conveying belt 32 to the back side of the fan 132. Each of the ducts 137 and 139 is provided with a filter 140 for removing the processing liquid and a filter 142 for removing the respective color inks on the upstream side of the fan 132.

  By driving the fan 132, the ducts 137 and 139 have negative pressure, and the air in the ducts 137 and 139 is sucked and blown out to the duct 134. The airflow passing through the duct 134 is blown perpendicularly to the transport belt 32 and branches to the treatment liquid head 34L side and the ink head 34Y side as indicated by arrows. During printing, there is an air flow in the direction of the arrow between the paper P (not shown) on the conveyor belt 32 and the treatment liquid head 34L, and between the paper P and the ink heads 34Y, 34M, 34C, and 34K. appear. During standby or during a dummy jet, an air flow is generated in the direction of the arrow between the transport belt 32 and the treatment liquid head 34L and between the transport belt 32 and each of the ink heads 34Y, 34M, 34C, and 34K.

  The air stream branched to the processing liquid head 34L side takes in the processing liquid mist discharged from the processing liquid head 34L and introduces it into the duct 137. The processing liquid mist in the air is adsorbed by the filter 140, and the processing liquid mist is absorbed. The removed air is returned to the fan 132. Further, the airflow branched to the ink heads 34Y, 34M, 34C, and 34K takes the ink mist and introduces it into the duct 139, and the ink mist in the air is adsorbed by the filter 142 and the air from which the ink mist has been removed. Is returned to the fan 132. The air in the ducts 137 and 139 is merged and blown out to the duct 134 by the fan 132, whereby the air is circulated.

  More specifically, as shown in FIG. 9, the airflow passing through the duct 134 branches to the treatment liquid head 34 </ b> L side and the ink head 34 </ b> Y side as indicated by an arrow 144. At that time, an air flow along the transport direction is generated in the entire region from the ink heads 34Y, 34M, 34C, 34K to the transport belt 32. For this reason, the ink mist is not conveyed to the treatment liquid head 34L side. Further, an airflow in the direction opposite to the transport direction is generated in the entire region from the treatment liquid head 34L to the transport belt 32. For this reason, the treatment liquid mist is not carried to the ink heads 34Y, 34M, 34C, 34K side. Further, by providing the guide portions 136 and 138 and the filters 140 and 142 on the exhaust side, the air from which the mist has been removed can be circulated.

  Further, in the normal print mode, the air volume of the fan 132 is set to a value that is affected only by the mist of the liquid droplets due to the wind speed generated between the paper P and the ejection surface (nozzle surface) 34A of the inkjet recording head 34. Yes. In the standby (non-printing) or dummy jet mode, the air volume of the fan 132 is set to a value larger than the air volume of the fan 132 during printing.

  In such a recovery device 130, the processing liquid and ink mist and dummy jet ejection droplets are not mixed with each other, and the processing liquid and ink mist and dummy jet ejection droplets are discharged to the ejection surface 34A of each recording head. There is no adhesion.

  Further, like the ink jet recording head 154 shown in FIG. 10, the treatment liquid head 34L may be disposed downstream of the ink heads 34Y, 34M, 34C, and 34K in the transport direction. The processing liquid and ink recovery device 150 is arranged opposite to the recovery device 130 shown in FIG. As a result, the processing liquid, the ink mist, and the dummy jet droplets can be collected without being mixed with each other.

  Next, a processing liquid and ink recovery device 160 used in an ink jet printer according to a fifth embodiment of the present invention will be described.

  In addition, the same code | symbol is attached | subjected to the member same as embodiment shown in FIG. 8, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 11, in the collection device 160, absorbent bodies 162Y, 162M, 162C, and 162K made of nonwoven fabric are provided on the downstream side of the ink heads 34Y, 34M, 34C, and 34K, respectively. The absorber 162 has a rectangular parallelepiped block shape, and is attached to the side walls of the ink heads 34Y, 34M, 34C, 34K along the longitudinal direction.

  The lower surface of the absorber 162 is provided so as to be positioned above the ink droplet ejection surface 34A of the ink heads 34Y, 34M, 34C, 34K. That is, the recesses 164 are formed between the ejection surfaces 34A of the ink heads 34Y, 34M, 34C, and 34K. The absorbers 162Y, 162M, and 162C provided on the downstream side of the ink heads 34Y, 34M, 34C, and 34K are an ink head 34Y and an ink head 34M, an ink head 34M and an ink head 34C, and an ink head, respectively. It is provided so as to be sandwiched between the head 34C and the ink head 34K so that the mist does not pass through.

  In addition, a protrusion 166 is provided along the longitudinal direction (from the front to the back of the drawing) at the downstream end of each ink head 34Y, 34M, 34C, 34K. The protrusion 166 is provided from the ejection surface 34A to the side walls of the ink heads 34Y, 34M, 34C, and 34K. The projection 166 projects from the ejection surface 34A toward the conveyance belt 32 and is adjacent to the downstream side. It protrudes to an area of about one half between 34M, 34C, and 34K (width of the recess 164).

  On the other hand, the recovery device 160 is provided with an absorbent body 162L made of a nonwoven fabric on the downstream side of the treatment liquid head 34L. The absorber 162L has a rectangular parallelepiped block shape, and is attached to the side wall of the treatment liquid head 34L along the longitudinal direction. Further, a protrusion 166 is provided along the longitudinal direction (from the front to the back in the figure) at the upstream end of the treatment liquid head 34L.

  In such a collecting device 160, since the distance between the lower surface 116A of the protrusion 166 and the transport belt 32 is smaller than the distance between the discharge surface 34A and the transport belt 32, the recovery device 160 is generated as the transport belt 32 moves. The speed of the airflow is higher when passing under the protrusion 166 than when passing under the discharge surface 34A. Further, the protruding portion 166 projecting toward the concave portion 164 generates an updraft from the conveyor belt 32 toward the absorber 162L and from the conveyor belt 32 toward the absorbers 162Y, 162M, 162C, and 162K. Thereby, since the mist contained in the airflow is adsorbed by the absorbers 162L, 162Y, 162M, 162C, and 162K, the mist is more reliably removed from the airflow.

  Further, the protrusion 166 is provided with an inclined portion 166B from the lower surface 166A to the discharge surface 34A. As a result, the airflow is guided below the protrusion 166 along the inclined portion 166B, so that it does not hit the protrusion 166 perpendicularly. That is, the airflow is not hindered by the protrusions 166 and smoothly passes under the protrusions 166 and flows into the recesses 164.

  In such a configuration, by providing the protrusions 166 and partially changing the distance between the ejection surface 34A and the transport belt 32 with respect to the transport direction, the airflow generated along with the transport of the paper P The upstream side of the printing heads 34Y, 34M, 34C, and 34K is faster on the downstream side, resulting in a turbulent flow and an upward air flow from the paper P toward the absorber 162. Thereby, the mist contained in the airflow is adsorbed by the absorber 162, and the mist is removed from the airflow. Further, it is possible to reduce the ink mist generated when ink droplets are ejected from the ink heads 34Y, 34M, 34C, 34K from adhering to the ejection surface 34A of the ink head 34 on the downstream side. In addition, since the treatment liquid mist and the ink mist are collected in different directions, the treatment liquid and the ink are prevented from being mixed and solidified, and problems such as blocking the nozzle can be reduced.

  Next, a treatment liquid recovery apparatus 180 used in an ink jet printer according to a sixth embodiment of the present invention will be described.

  In addition, the same code | symbol is attached | subjected to the member same as embodiment shown in FIG.1 and FIG.2, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 12, in this processing liquid recovery apparatus 180, electrodes 182 and 184 are arranged in parallel in a direction orthogonal to the processing liquid ejection surface 34A of the processing liquid head 34L. Each of the electrodes 182 and 184 is provided almost all over the longitudinal direction of the treatment liquid head 34. Power sources 186 and 188 to which a positive DC voltage is applied are connected to the electrodes 182 and 184, respectively, and energization is controlled by switches 190 and 192.

In general, a droplet ejected in the dummy jet mode has a slow droplet speed, but has a larger droplet volume than a mist (satellite) in the normal print mode, and it may be difficult to collect the mist. In the processing liquid recovery apparatus 180, a high electric field acts between the electrodes 182 and 184 by applying a predetermined voltage from the power sources 186 and 188 to the electrodes 182 and 184 disposed opposite to each other. Thus, FIG. 12 (A), (B) as shown in, for droplets L ₁ is miniaturized (electrostatic atomization) has been mist L _2, and the momentum of mist L ₂ smaller Recovery by the absorber 162L becomes easy.

  The electrodes 182 and 184 that generate the electric field may be formed integrally with the processing liquid head 34L, or may be a mechanism independent of the processing liquid head 34L. In any case, the switches 190 and 192 are controlled in synchronization with the dummy jet injection to energize.

  On the other hand, by providing an ink recovery device having the same configuration as the treatment liquid recovery device 180 on the ejection surfaces of the ink heads 34Y, 34M, 34C, and 34K, the ink droplets are miniaturized in the dummy jet mode ( Electrostatic atomization). As a result, the ink droplets are miniaturized, the momentum is reduced, and collection is facilitated.

  Next, a processing liquid recovery apparatus 200 used in an ink jet printer according to a seventh embodiment of the present invention will be described.

  In addition, the same code | symbol is attached | subjected to the member same as embodiment shown in FIG.1 and FIG.2, and the overlapping description is abbreviate | omitted.

  As shown in FIGS. 13 and 14A, the conveying belt 202 has a plurality of holes 202A through which air passes. The opening 202A is formed on almost the entire surface of the conveyor belt 202. A platen 204 for guiding the conveyance belt 202 is disposed on the back side of the conveyance belt 202 facing the treatment liquid head 34L (on the opposite side to the treatment liquid head 34L). The platen 204 has a plurality of openings 204A through which air passes. The opening 204A has a larger diameter than the opening 202A of the conveyor belt 202. A fan 206 that blows air in the direction of the treatment liquid head 34 </ b> L is provided on the back side of the platen 204 (the side opposite to the conveying belt 202).

  In such a treatment liquid recovery apparatus 200, by driving the fan 206 in the dummy jet mode, air is blown from the opening 204A of the platen 204 to the treatment liquid head 34L through the opening 202A of the conveying belt 202. . Thereby, the droplet speed of the droplet L can be decelerated more reliably, and the recovery of the droplet L becomes easy. Further, by providing an opening 204A larger than the opening 202A of the conveying belt 202 in the platen 204 below the conveying belt 202, air can be reliably blown.

  FIG. 13 shows an example in which the treatment liquid droplets are collected from the treatment liquid head 34L in the dummy jet mode, but an ink collection device having the same configuration as the treatment liquid collection device 200 is provided for each ink head 34Y, 34M. , 34C, 34K may be provided so as to decelerate the ink droplet speed during the dummy jet.

  In FIG. 14A, an air blowing hole 202A is provided on the entire surface of the conveying belt 202. However, as shown in FIG. A plurality of openings 212A may be provided only in the region 214 of the conveyor belt 212.

  In FIG. 13, the fan 206 that compresses and blows air is used. However, the blower 206 is not limited to the fan 206 and may be other blowing means such as compressed air by a pump.

  In such a configuration, the effect cannot be exhibited if there is a sheet P on the conveyor belt 202. Therefore, the dummy jet is performed when the sheet P is not present in the corresponding portion (that is, the sheet P and the sheet P). (Interval) only.

  Next, a processing liquid and ink recovery apparatus 220 used in the ink jet printer according to the eighth embodiment of the present invention will be described.

  In addition, the same code | symbol is attached | subjected to the member same as embodiment shown in FIG.1 and FIG.2, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 15, both ends of the support shaft 28 </ b> A of the drive roll 28 and both ends of the support shaft 30 </ b> A of the driven roll 30 are rotatably supported by a support member 221 that is bent in a U shape. The support member 221 is supported by a frame (not shown) so as to be movable in a direction (vertical direction) approaching and retracting from the inkjet recording head 34. A solenoid 222 is provided below the support member 221, and the support member 221 can be moved by moving the rod 222A forward and backward.

  Generally, when aiming at high image quality, there is a case where a gap (TD: Throw Distance, hereinafter referred to as TD) between the inkjet recording head 34 and the conveyance belt 32 is narrowed, but if the TD is narrowed, the dummy jet cannot be recovered. There is a possibility that the conveyor belt 32 is contaminated. For this reason, in the dummy jet mode, as shown in FIG. 16, the rod 222A of the solenoid 222 is retracted and the support member 221 is moved in the direction of the arrow 224, thereby widening the TD. Thereby, the ejected droplet can be reliably collected.

  15 and 16 show a configuration in which the entire unit of the support member 221 that supports the conveyance belt 32 is retracted, the ink jet recording head 34 may be moved upward, or both may be combined.

  However, when this configuration is applied, it takes time to physically move up and down, and printing cannot be performed during that time. At this time, the driving of the conveying belt 32 may be stopped. However, if the rotation is continued, the speed fluctuation of the sheet conveying system does not occur, so that it is possible to promptly shift to the next printing.

  In the above embodiment, the ink jet recording head 34 is used, but a thermal method, a piezoelectric method, or the like is also applicable. As the ink, various inks such as water-based ink, oil-based ink, and solvent-based ink can be used. In the example shown in FIG. 1 and the like, the endless transport belt 32 is suspended from the drive roll 28 and the driven roll 30, but the number of rolls that support the transport belt 32 can be set as appropriate.

  In the example shown in FIG. 1 and the like, an example of FWA corresponding to the paper width has been described. However, the inkjet recording head of the present invention is not limited to this, and a partial width array (PWA) having a main scanning mechanism and a sub-scanning mechanism. It can also be applied to the apparatus of

  In the example shown in FIG. 1 and the like, an image (including characters) is recorded on the paper P as a recording medium. However, the liquid droplet ejection head and the liquid droplet ejection apparatus of the present invention are not limited to this. Is not to be done. That is, the recording medium is not limited to paper, and the liquid to be ejected is not limited to ink. For example, it is industrially useful to create color filters for displays by discharging ink onto polymer films or glass, or to form bumps for component mounting by discharging solder in a welded state onto a substrate. The present invention can be applied to all droplet discharge heads and droplet discharge apparatuses used.

1 is a schematic configuration diagram illustrating an ink jet printer (droplet discharge device) according to a first embodiment of the present invention. FIG. 2 is a schematic configuration diagram illustrating an ink head, a processing liquid head, an ink recovery device, and a processing liquid recovery device in the ink jet printer illustrated in FIG. 1. FIG. 2 is a schematic configuration diagram illustrating an example of recovering ink and processing liquid using an ink head, a processing liquid head, an ink recovery apparatus, and a processing liquid recovery apparatus in the ink jet printer illustrated in FIG. 1. (A) is a voltage waveform applied to the ink head, (B) is a speed of the ejected ink droplet, and (B) is a diagram showing a state of the ejected ink droplet. (A) is a voltage waveform applied to the processing liquid head, (B) is a velocity of the discharged processing droplet, and (B) is a diagram showing a state of the discharged processing droplet. It is a schematic block diagram which shows the ink head used for the inkjet printer which is 2nd Embodiment of this invention, the head for process liquid, the collection | recovery apparatus for ink, and the collection apparatus for process liquid. It is a schematic block diagram which shows the process liquid head used for the inkjet printer which is 3rd Embodiment of this invention, and the process liquid collection | recovery apparatus. It is a schematic block diagram which shows the ink head used for the inkjet printer which is 4th Embodiment of this invention, the head for process liquid, the collection apparatus for ink, and a process liquid. It is the figure which showed the direction where the airflow which passed the duct between the head for process liquid shown in FIG. 8 and the head for an ink is branched by the arrow. FIG. 9 is a schematic configuration diagram illustrating an ink head, a processing liquid head, and an ink and processing liquid recovery device that are modifications of the ink jet printer illustrated in FIG. 8. It is a schematic block diagram which shows the ink head used for the inkjet printer which is 5th Embodiment of this invention, the head for process liquid, the collection apparatus for ink, and a process liquid. (A) is a schematic block diagram which shows the process liquid head used for the inkjet printer which is 6th Embodiment of this invention, and the process liquid collection | recovery apparatus, (B) is the state which atomizes process droplets FIG. It is a schematic block diagram which shows the process liquid head used for the inkjet printer which is 7th Embodiment of this invention, and the process liquid collection | recovery apparatus. (A) is a figure which shows the conveyance belt used for the inkjet printer shown in FIG. 13, (B) is a figure which shows the modification of a conveyance belt. It is a schematic block diagram which shows the ink head used for the inkjet printer which is 8th Embodiment of this invention, the head for process liquid, the collection apparatus for ink, and a process liquid. FIG. 16 is a diagram illustrating a recovery operation of a recovery device for ink and processing liquid in the inkjet printer shown in FIG. 15.

Explanation of symbols

10 Inkjet printer (droplet discharge device)
32 Conveying belt 34 Inkjet recording head (droplet ejection head)
34Y, 34M, 34C, 34K Ink head (first liquid recording head)
34L processing liquid head (second liquid recording head)
34A Ejection surface 35 Nozzle 50 Recording head controller (control means)
60Y, 60M, 60C, 60K Ink recovery device (ink recovery mechanism)
60L processing liquid recovery device (processing liquid recovery mechanism)
62 Conductive filter unit 80 Treatment liquid collection device (treatment liquid collection mechanism)
82 Ink recovery device (ink recovery mechanism)
84 Duct (second duct)
88 Suction fan 90 Suction unit 92 Duct (first duct)
96 Suction fan 98 Adsorption unit 110 Processing liquid recovery device (processing liquid recovery mechanism)
112 Electrode 116 Gutter 120 Waste tank 122 Fan 123 Duct 130 Recovery device (processing liquid recovery mechanism, ink recovery mechanism)
132 Fan 134 Duct 137 Duct (second duct)
139 Duct (first duct)
140 Filter 142 Filter 150 Recovery device (processing liquid recovery mechanism, ink recovery mechanism)
154 Inkjet recording head (droplet ejection head)
160 Recovery device (processing liquid recovery mechanism, ink recovery mechanism)
162 Absorber 166 Protrusion 180 Treatment liquid collection device (treatment liquid collection mechanism)
182 Electrode 200 Treatment liquid recovery device (treatment liquid recovery mechanism)
202 Conveyor belt 202A Opening hole 204 Platen 204A Opening hole 206 Fan (air blowing means)
212 Conveying belt 212A Open hole 220 Recovery device (processing liquid recovery mechanism, ink recovery mechanism)
221 Support member 222 Solenoid (moving means)

Claims (12)

A liquid comprising a first liquid recording head for discharging the first liquid and a second liquid recording head for discharging the second liquid, wherein the first liquid and the second liquid are mixed and reacted on a recording medium. A droplet discharge device,
After discharging the first liquid droplet from the first liquid recording head and the second liquid droplet from the second liquid recording head, and before adhering to the conveying means for conveying the recording medium or the recording medium, A first liquid recovery mechanism that recovers all or part of the first droplet, and a second liquid recovery mechanism that recovers all or part of the second droplet in a direction different from that of the first droplet. And a droplet discharge device.   2. The droplet discharge device according to claim 1, wherein all of the first droplet and the second droplet are collected in a dummy jet mode different from normal discharge.   Control means for varying the discharge speed of the first droplet or the second droplet by changing the voltage waveform applied when the first liquid recording head or the second liquid recording head is driven. The liquid droplet ejection apparatus according to claim 1, wherein:   4. The liquid droplet ejection apparatus according to claim 3, wherein the dummy jet mode makes the ejection speed of the first liquid droplet or the second liquid droplet slower than a normal ejection speed. 5.   The first liquid droplet or the second liquid droplet discharged by arranging an electrode facing the first liquid recording head or the second liquid recording head in the vicinity of the first liquid recording head and applying an electric field in the dummy jet mode. 5. The droplet discharge device according to claim 1, wherein the droplet discharge device is decomposed. The transport means comprises a transport belt;
In the dummy jet mode, there is provided air blowing means for generating an air flow from an opening formed in the conveying belt toward the first liquid recording head or the second liquid recording head. The droplet discharge device according to any one of claims 1 to 5.   The first liquid recovery mechanism and the second liquid recovery mechanism are provided on the outer sides of the first liquid recording head and the second liquid recording head, respectively, and a voltage is applied thereto. The liquid droplet ejection apparatus according to claim 1, wherein the liquid droplet ejection apparatus is an adsorption member that electrostatically adsorbs the first liquid droplet or the second liquid droplet.   The first liquid recovery mechanism and the second liquid recovery mechanism are provided on the outer sides of the first liquid recording head and the second liquid recording head, respectively, and generate negative pressure. The liquid droplet ejection apparatus according to claim 1, further comprising a duct that sucks the first liquid droplet or the second liquid droplet. The first liquid recovery mechanism or the second liquid recovery mechanism is:
A duct portion provided between the first liquid recording head and the second liquid recording head, for blowing air toward the conveying means or the recording medium;
A fan disposed upstream of the duct portion;
A first duct into which an air flow generated by the air toward the first liquid recording head is introduced;
A second duct into which an air flow generated by the air toward the second liquid recording head is introduced;
6. The droplet discharge device according to claim 1, wherein the droplet discharge device is provided.   The droplet discharge device according to claim 9, wherein a filter is provided between the first duct, the second duct, and the fan.   2. The apparatus according to claim 1, further comprising a moving unit that widens the interval between the conveyance belt that conveys the sheet, the first liquid recording head, and the second liquid recording head in the dummy jet mode as compared with normal ejection. The droplet discharge device according to any one of claims 2 to 10.   The liquid droplet ejection apparatus according to claim 1, wherein the first liquid is ink, and the second liquid is a processing liquid.

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