JP2009018425A - Liquid jet apparatus and liquid jet method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain speed-up of printing in a line printer which is equipped with heads where nozzle arrays are formed in a direction that intersects a conveyance direction of a medium, and which prints while conveying the medium. <P>SOLUTION: The liquid jet apparatus includes a first head which has nozzles to jet the liquid, a second head which has nozzles opposed to the nozzles of the first head and jets the liquid from the nozzles, a superposing part which acquires the medium one sheet by one sheet and turns two sheets of the media in a state to be superposed, and a conveying part which conveys the two sheets of the media in a superposition state at a position where the nozzles of the first head and the nozzles of the second head are opposed to each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid ejecting apparatus and a liquid ejecting method.

  As one of liquid ejecting apparatuses, an ink jet printer that performs printing by ejecting ink from nozzles onto various media such as paper, cloth, and film is known. In an ink jet printer, there is a demand for shortening the printing time for printing on a medium. For example, in a serial inkjet printer that prints while a head having a nozzle row whose row direction is the conveyance direction is moved at right angles to the conveyance direction, printing speed is increased by increasing the number of nozzles formed on the head. Yes. Or, for example, as disclosed in Patent Document 1, two transfer media are provided, images are formed on the two transfer media by inkjet, and the images are simultaneously transferred to both sides of the media, thereby reducing the printing time and printing. Technologies for speeding up have been proposed.

JP-A-5-261911

  A line printer that includes a head in which nozzle rows are formed in a direction that intersects the medium conveyance direction and that conveys and prints the medium does not perform printing while moving the head at a right angle to the conveyance direction, like a serial printer. In addition, since printing is performed with the head fixed, there is a strong demand for higher printing speed.

  SUMMARY An advantage of some aspects of the invention is to solve some of the problems described above, and the invention can be implemented as the following forms or application examples.

  [Application Example 1] A first head having a nozzle for ejecting liquid, a second head having a nozzle facing the nozzle of the first head, and ejecting liquid from the nozzle, and a medium are obtained one by one. Then, the two media are superposed at a position where the superimposing unit that superimposes the two media, the nozzle of the first head, and the nozzle of the second head face each other. A liquid ejecting apparatus comprising: a conveying unit that conveys the liquid in a state where the liquid is ejected.

  According to this configuration, of the two superimposed media, the nozzle of the first head is opposed to one side of one medium and the nozzle of the second head is opposed to one side of the other medium. Two media can be conveyed simultaneously. Therefore, if liquid is ejected from the nozzles of the first head and the nozzles of the second head, it is possible to form an image by ejecting the liquid onto one side of each of the two media. Therefore, the printing speed can be increased.

  Application Example 2 The superposition unit includes a first acquisition unit and a second acquisition unit that respectively acquire one medium, and the first acquisition unit and the second acquisition unit are simultaneously The liquid ejecting apparatus according to claim 1, wherein the two mediums are overlapped with each other by acquisition.

  According to this configuration, since the first acquisition unit and the second acquisition unit acquire one medium at the same time, the time required for acquisition is reduced. Therefore, the printing speed can be increased.

  Application Example 3 The superimposing unit includes an acquisition unit that acquires one medium and a detection unit that detects the acquired number of sheets, and stops the acquisition every time the number becomes the second number. The liquid ejecting apparatus according to claim 1, wherein the two mediums are superposed on each other.

  According to this configuration, by providing one acquisition unit, it is possible to put two media on top of each other. Therefore, it is possible to suppress an increase in manufacturing cost. Moreover, it can suppress that an apparatus enlarges.

  Application Example 4 The liquid ejecting apparatus according to the application example, wherein the transport unit transports the two media in a direction of gravity.

  If it does in this way, it can control that the edge of a medium bends in the direction of gravity. Therefore, it is possible to prevent the medium from being transported by hitting the members constituting the transport unit and the quality of the image formed on the medium from being deteriorated when the liquid is ejected from the nozzle.

  Application Example 5 The liquid ejecting apparatus according to the application example, wherein the superimposing unit includes a charging unit that causes the medium to be charged with static electricity, and the two media are adsorbed and overlapped by the static electricity.

  In this way, the two media are not peeled off. Accordingly, an image can be formed by simultaneously ejecting liquid onto the surface of the medium facing the nozzle of the first head and the surface of the medium facing the nozzle of the second head.

  Application Example 6 The present invention can also be understood as a liquid ejection method. That is, the step of ejecting liquid from the nozzles provided in the first head, the step of ejecting liquid from the nozzles provided in the second head, and the medium are obtained one by one, and the two media are superimposed. A superposition step for bringing the two media into a superposed state at a position where the nozzles of the first head and the nozzles of the second head face each other. A liquid ejecting method comprising:

  Embodiments will be described with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of the printer 1 according to this embodiment.

  Hereinafter, a basic configuration of the printer 1 will be described. As shown in FIG. 1, the printer 1 includes a controller 6, a transport unit 8, a liquid ejecting head unit 9, and a detector group 7. The printer 1 that has received the print data from the computer 100, which is an external device, controls the transport unit 8 and the liquid ejecting head unit 9 by the controller 6. The controller 6 controls each unit based on the print data received from the computer 100 and forms an image by ejecting ink as a liquid onto the paper. The situation in the printer 1 is monitored by a detector group 7, and the detector group 7 outputs a detection result to the controller 6. The controller 6 that receives the detection result from the detector group 7 controls each unit based on the detection result.

  The controller 6 is a control unit for controlling the printer 1. The controller 6 includes an interface (I / F) 2, a CPU 3, a memory 5, and a unit control circuit 4. The interface 2 is for transmitting and receiving data between the computer 100 and the printer 1. The CPU 3 is an arithmetic processing unit for controlling the entire printer 1. The memory 5 is for securing an area for storing a program of the CPU 3, a work area, and the like, and includes storage elements such as a RAM and an EEPROM. The CPU 3 controls each unit via the unit control circuit 4 according to a program stored in the memory 5.

(First embodiment)
A first embodiment will be described. In the first embodiment, a case where two media are overlapped by the first acquisition unit and the second acquisition unit will be described. FIG. 2 is a schematic external perspective view of an essential part in the first embodiment.

  As shown in FIG. 2, the printer 1 includes paper cassettes 50 and 51 that hold a plurality of papers including papers S1 and S2 as one medium. Paper is fed from the paper cassettes 50 and 51 by paper feed rollers 31 and 41 rotated by a motor (not shown).

  The printer 1 also includes transport rollers 32, 33, and 34 that are rotated by a motor (not shown), and transports the paper S1 along the transport surface 30 in the direction D1. Further, transport rollers 42, 43, and 44 that are rotated by a motor (not shown) are provided to transport the paper S2 along the transport surface 40 in the direction D2.

  Drive rollers 21 and 22 that are rotated by a motor (not shown) are provided on the left side of the conveyance surfaces 30 and 40 in the drawing, and rotate the conveyance belt 20 in the direction D3. The paper S1 discharged from the transport surface 30 and the paper S2 discharged from the transport surface 40 are superimposed on the transport belt 20.

  Here, a state in which the paper S1 and the paper S2 are overlaid will be described with reference to FIGS. FIG. 3A is a diagram for explaining how the papers S1 and S2 are transported along the transport surfaces 30 and 40, respectively.

  A sheet S1 from the sheet cassette 50 is brought into contact with the rotating conveying roller 32 by the sheet feeding roller 31 shown in FIG. Then, the paper S <b> 1 is taken into the transport surface 30 by the rotating transport roller 32. Then, as shown in FIG. 3A, the paper S <b> 1 is transported along the transport surface 30 by the transport rollers 32, 33, and 34.

  A sheet S2 from the sheet cassette 51 is brought into contact with the rotating conveying roller 42 by the sheet feeding roller 41 in FIG. Then, the paper S <b> 2 is taken into the transport surface 40 by the rotating transport roller 42. Then, as shown in FIG. 3A, the paper S <b> 2 is transported along the transport surface 40 by the transport rollers 42, 43, 44.

  The controller 6 in FIG. 1 makes the timing for starting the rotation of the paper feed roller 31 and the timing for starting the rotation of the paper feed roller 41 the same. Then, the sheets S1 and S2 are taken into the transport surfaces 30 and 40 at the same time.

  FIG. 3B is a diagram illustrating a state in which the papers S1 and S2 overlap on the conveyance belt 20. As shown in FIG. 3B, the paper S1 and the paper S2 are transported by a transport belt 20 that is rotated by driving of the drive rollers 21 and 22 while overlapping.

  FIG. 3C is a diagram for explaining the state of the overlapping paper on the conveyor belt 20. In this way, the paper S1 and the paper S2 can be overlapped on the upper portion of the transport belt 20 as shown in FIG.

  Next, a method for forming an image by ejecting ink onto the overlapping paper S1 and paper S2 will be described.

  A head 10 as a first head and a head 13 as a second head are provided on the left side of the conveyance belt 20 in FIG. The heads 10 and 13 are arranged in a direction perpendicular to the transport direction D3 (hereinafter referred to as the transport direction) of the papers S1 and S2 in the longitudinal direction. The heads 10 and 13 are formed with nozzle rows in a direction intersecting the transport direction. The nozzle forming surface on which the nozzles of the head 10 are formed and the nozzle forming surface on which the nozzles of the head 13 are formed are arranged at positions facing each other. That is, the head 10 and the head 13 are arranged so that the nozzles of the head 10 and the nozzles of the head 13 face each other.

  On both sides of the heads 10 and 13 in the drawing, transport rollers 11 and 12 and transport rollers 15 and 16 arranged in the direction of gravity are arranged with the axial direction perpendicular to the transport direction.

  L1 in FIG. 2 indicates the distance between the end portions of the transport rollers 11 and 12 and the end portions of the transport rollers 15 and 16 in the transport direction. L2 indicates the width of the heads 10 and 13 in the paper transport direction. The distance L1 is longer than the width L2. Therefore, even if the heads 10 and 13 are brought close to each other in the direction of gravity, the heads 10 and 13 do not hit the transport rollers 11, 12, 15, and 16.

  In this embodiment, the distance L1 is determined by the rigidity of the paper S1, S2 when the stacked paper S1, S2 is sandwiched between the transport rollers 11, 12 or the transport rollers 15, 16. This is the distance at which the end of S2 can be kept almost horizontal without bending in the direction of gravity.

  FIG. 4A is a diagram illustrating a state in which the overlapped sheets S1 and S2 are transported by the transport rollers 11 and 12, respectively. As shown in FIG. 4A, the stacked sheets S1 and S2 are conveyed from the right side of the drawing to the left side while being sandwiched between the conveying rollers 11 and 12. At this time, the end portions of the papers S1 and S2 can be kept substantially horizontal without bending in the direction of gravity due to the rigidity of the paper.

  FIG. 4B is a diagram illustrating a state in which the overlapping sheets S1 and S2 are conveyed by the conveyance rollers 11, 12, 15, and 16. As shown in FIG. 4B, since the stacked sheets S1 and S2 are sandwiched between the transport rollers 11, 12, 15, and 16, the sheets S1 and S2 are transported from the right side of the drawing to the left side. The end of can be kept almost horizontal without bending in the direction of gravity.

  FIG. 4C is a diagram illustrating a state in which the overlapped sheets S1 and S2 are transported by the transport rollers 15 and 16. As shown in FIG. 4C, the stacked sheets S1 and S2 are conveyed from the right side to the left side while being sandwiched between the conveying rollers 15 and 16. At this time, the end portions of the papers S1 and S2 can be kept substantially horizontal without bending in the direction of gravity due to the rigidity of the paper.

  In this way, the two sheets S1 and S2 are conveyed in a state of being overlapped at a position where the nozzle of the head 10 and the nozzle of the head 13 face each other. Then, when the superposed paper S1, S2 is conveyed by the conveying rollers 11, 12, 15, 16, an ink is ejected onto the surface of the paper S1 to which the nozzles of the head 10 face, and simultaneously, an image is formed. An image can be formed by ejecting ink onto the surface of the paper S2 facing the nozzles of the head 13.

  In the present embodiment, the superimposing unit includes the conveyance belt 20, the driving rollers 21 and 22, the conveyance surface 30 as the first acquisition unit, the paper feed roller 31, the conveyance rollers 32, 33, and 34, and the second acquisition unit. The conveying surface 40, the sheet feeding roller 41, and the conveying rollers 42, 43, 44 are configured. Further, the transport unit is configured by transport rollers 11, 12, 15, and 16.

  Moreover, the superimposition unit including the first acquisition unit and the second acquisition unit, and the conveyance unit indicate the conveyance unit 8 described with reference to FIG. 1 and are controlled by the controller 6. The heads 10 and 13 are the liquid jet head unit 9 shown in FIG. 1 and are controlled by the controller 6.

  As described above, the printer 1 has the head 10 as a first head having nozzles that eject ink as liquid, and the second head that has nozzles facing the nozzles of the head 10 and ejects liquid from the nozzles. In the position where the head 13 as the medium, the paper as the medium one by one, the overlapping part that overlaps the two mediums, the nozzle of the head 10 and the nozzle of the head 13 face each other, And a transport unit that transports the two sheets S1 and S2 in an overlapped state.

  The superimposing unit includes a first acquisition unit and a second acquisition unit that respectively acquire one medium, and the first acquisition unit and the second acquisition unit can acquire 2 by acquiring simultaneously. Put the sheets of media on top of each other.

  According to this configuration, of the two superimposed media, the nozzle of the first head is opposed to one side of one medium and the nozzle of the second head is opposed to one side of the other medium. Two media can be conveyed simultaneously. Therefore, if liquid is ejected from the nozzles of the first head and the nozzles of the second head, it is possible to form an image by ejecting the liquid onto one side of each of the two media. Therefore, the printing speed can be increased.

  In addition, since the first acquisition unit and the second acquisition unit acquire one medium at the same time, the time required for acquisition is shortened. Therefore, the printing speed can be increased.

(Second embodiment)
In the second embodiment, a case will be described in which a detection unit that detects the acquired number of sheets is provided, and the medium is overlapped each time the number of sheets becomes the second.

  FIG. 5 is a schematic external perspective view of a main part in the second embodiment. FIG. 5 is obtained by removing the paper cassette 51 of FIG. 2 in the first embodiment and the paper feed roller 41, the transport surface 40, and the transport rollers 42, 43, and 44 as the second acquisition unit. About the code | symbol of FIG. 5, it is the same as the code | symbol of FIG. 2 used in 1st Example. At the position where the head 10 as the first head, the head 13 as the second head, the first acquisition unit constituting the overlapping unit, the nozzles of the head 10 and the nozzles of the head 13 face each other, two sheets of paper are The configuration of the transport unit transported in the superimposed state is the same as the configuration of the first embodiment, and a description thereof will be omitted.

  The photoelectric sensor 35 is a detector that detects, one by one, that a piece of paper taken out from the paper cassette 50 has been conveyed along the conveyance surface 30 and moved up to the conveyance belt 20.

  A method for superposing two sheets of paper will be described. First, the controller 6 stops the rotation of the conveyance belt 20 and the rotation of the conveyance rollers 11, 12, 15, and 16. Next, the controller 6 rotates the transport rollers 32, 33, and 34. Next, the controller 6 rotates the paper feed roller 31 to take the first sheet S1 into the transport surface 30. Then, the paper S1 is transported along the transport surface 30 by the rotating transport rollers 32, 33, and 34.

  The first sheet S1 is discharged from the conveying surface 30 by the rotation of the conveying roller 34, and the end of the paper S1 moves from the conveying surface 30 to the upper portion of the conveying belt 20 while sliding on the upper portion of the conveying belt 20. At this time, the controller 6 detects that the first sheet S <b> 1 has been moved from the conveyance surface 30 to the upper portion of the conveyance belt 20 by the photoelectric sensor 35.

  Next, the controller 6 rotates the paper feed roller 31 to take a second sheet (not shown) into the transport surface 30. Then, the second sheet is conveyed along the conveying surface 30 by the rotating conveying rollers 32, 33, and 34.

  Then, the second sheet moves to a position overlapping the first sheet S1 by sliding on the surface of the first sheet S1 by the rotation of the transport roller 34. At this time, the controller 6 uses the photoelectric sensor 35 to detect that the second sheet has been moved from the conveying surface 30 to the conveying belt 20 side.

  Here, the controller 6 stops the operation of acquiring the third sheet. That is, the paper feed roller 31 is not rotated for taking the paper in the paper cassette 50 into the transport surface 30.

  Then, the controller 6 starts rotation of the conveyance belt 20 and rotation of the conveyance rollers 11, 12, 15, and 16. Then, in a state where the first sheet S1 and the second sheet are overlapped, the sheet is conveyed from the right side to the left side by the conveying rollers 11, 12, 15, and 16.

  In this embodiment, the superimposing unit includes the conveyance belt 20, the driving rollers 21 and 22, the conveyance surface 30 as the acquisition unit, the paper feed roller 31, the conveyance rollers 32, 33, and 34, and the photoelectric sensor 35 as the detection unit. Composed. Further, the transport unit is configured by transport rollers 11, 12, 15, and 16.

  In this embodiment, the superimposing unit includes an acquisition unit that acquires paper as one medium and a detection unit that detects the acquired number of sheets. By stopping the acquisition, the two media are overlapped.

  In this way, by providing one acquisition unit, it is possible to make two sheets of paper overlapped. Therefore, it is possible to suppress an increase in manufacturing cost. Moreover, it can suppress that an apparatus enlarges.

(Third embodiment)
In the third embodiment, a description will be given of a case where the position where the nozzles of the first head and the nozzles of the second head face each other is transported with the surface direction of the medium being the direction of gravity. In this embodiment, the overlapping portion described in the first embodiment and the second embodiment can be used.

  FIG. 6 is an external perspective view of a transport belt that changes the surface of the transported paper from the horizontal direction to the gravity direction. On the right side of the drawing, the conveyor belt 20 described in the first and second embodiments is provided. The transport belt 20 transports the paper S <b> 1 whose paper surface is horizontal and is moved to the transport belt 60. The conveyor belt 60 is rotated in the direction D4 by drive rollers 66, 67, 68, 69, and 70 that are rotated by a motor (not shown).

  The conveyor belt 60 is further provided with drive rollers 61, 62, 63, 64, 65 that are rotated by a motor (not shown).

  The driving rollers 65 and 66 are provided in parallel with the shaft of the driving roller 21 that drives the transport belt 20 with the shaft in the horizontal direction. The drive rollers 61 and 70 are provided with their axes in the direction of gravity.

  As shown in FIG. 6, the driving rollers 65 and 66, the driving rollers 64 and 67, the driving rollers 63 and 68, the driving rollers 62 and 69, and the driving rollers 61 and 70 are provided in parallel with the conveyance belt 60 interposed therebetween. ing. The driving rollers 64 and 67, the driving rollers 63 and 68, and the driving rollers 62 and 69 are arranged so that the angle at which the axial direction and the horizontal direction intersect increases as the driving rollers 61 and 70 are approached.

  The paper S1 discharged from the transport belt 20 is sandwiched between the drive rollers 65, 64, 63, 62, 61 and the transport belt 60 and transported from the right side to the left side of the drawing. Discharged.

  By being transported by such drive rollers and the transport belt 60, the surface of the transported paper can be changed from the horizontal direction to the gravity direction. Further, the paper S1 can be transported without reducing the transport speed.

  FIG. 7 is a diagram illustrating a state in which ink is ejected with the paper surface in the direction of gravity. The heads 10a and 13a are arranged with the nozzle forming surfaces facing each other and the longitudinal direction being the direction of gravity. The transport rollers 11a, 12a, 15a, and 16a are arranged with their axes in the direction of gravity. The superposed papers S1 and S2 are conveyed from the right side to the left side with the paper surface in the direction of gravity.

  FIG. 8A is a diagram illustrating a state in which the sheets S1 and S2 are conveyed while being sandwiched between the conveying rollers 11a and 12a. FIG. 8B is a diagram illustrating a state in which the sheets S1 and S2 are conveyed while being sandwiched between the conveying rollers 15a and 16a. As shown in FIG. 8A and FIG. 8B, even when transported between a pair of transport rollers, the paper surface is transported in the direction of gravity. It can suppress that the edge part of paper S1, S2 bends in the direction of gravity.

  In this embodiment, the transport unit is configured by transport rollers 11a, 12a, 15a, and 16a.

  As described above, the head 10a as the first head having nozzles that eject ink as liquid, and the head 13a as the second head that has nozzles facing the nozzles of the head 10a and ejects ink from the nozzles. Then, the two sheets of paper are superposed at a position where the superimposing unit that obtains the paper one by one and superimposes the two sheets, the nozzle of the head 10a, and the nozzle of the head 13a face each other. And a transport unit for transporting in a state where And the conveyance rollers 11a, 12a, 15a, 16a as a conveyance part convey the surface direction of the paper S1, S2 as two media as a gravity direction.

  If it does in this way, it can control that the edge of a medium bends in the direction of gravity. Therefore, it is possible to prevent the medium from being transported by hitting the members constituting the transport unit and the quality of the image formed on the medium from being deteriorated when the liquid is ejected from the nozzle.

(Fourth embodiment)
In the fourth embodiment, a case will be described in which a charging unit for charging a medium with static electricity is provided, and two media are attracted and conveyed by static electricity.

  FIG. 9 is a schematic external perspective view of a main part in the fourth embodiment. FIG. 9 is a schematic perspective view of the main part of FIG. 5 described in the second embodiment, provided with a charging unit 80. The charging unit 80 is disposed above the transport belt 20 by a support member (not shown) that can change the position of the charging unit 80. When there is no paper on the upper part of the conveying belt 20, the supporting member can be retracted to a position where the charging unit 80 does not contact when the paper is conveyed. When the two sheets of paper superposed on the upper part of the conveyance belt 20 are conveyed, the charging unit 80 is brought into contact with the paper by the support member to charge the paper.

  Then, the two sheets of paper can be adsorbed to each other by static electricity. Since the transport belt uses a non-conductive member such as rubber that is not affected by static electricity, paper is not attracted to the transport belt 20.

  In the present embodiment, the overlapping unit includes the conveyance belt 20, the driving roller 21, the driving roller 22, and the charging unit 80.

  As described above, the overlapping unit includes the charging unit 80 that charges the paper as the medium with static electricity, and the two sheets of paper as the medium are adsorbed and transported by the static electricity.

  In this way, the two sheets are not peeled off. Accordingly, an ink as a liquid is simultaneously ejected onto the paper surface facing the nozzle of the head 10 as the first head and the paper surface facing the nozzle of the head 13 as the second head to form an image. be able to. As a result, the printing speed can be increased.

  In the first to fourth embodiments, a case where two sheets of paper are transported in an overlapped state and ink is ejected at a position where the nozzles of the first head and the nozzles of the second head face each other will be described. However, ink may be ejected at a position where a sheet of paper is conveyed and the nozzles of the first head and the nozzles of the second head face each other. By so doing, it is possible to form an image by ejecting ink onto both sides of a sheet of paper as one medium.

  The technique described above can also be applied to the case where bubbles are generated in the nozzle using a heating element and the liquid is ejected by the bubbles.

  The technology described above can be applied to various industrial apparatuses other than a printing apparatus that performs printing by ejecting ink onto paper or the like. Mainly, the materials such as printing materials for patterning fabrics, liquid crystal displays, organic light emitting diode (EL) displays, and other materials such as electrodes and coloring materials are dispersed or dissolved. Examples thereof include a liquid state device for injecting a liquid material.

1 is an overall configuration block diagram of a printer according to an embodiment. FIG. 3 is a schematic perspective view of an essential part of the first embodiment. (A) A diagram for explaining how the paper is conveyed along the conveyance surface, (b) a diagram for explaining how the paper overlaps on the conveyance belt, and (c) a paper that overlaps on the conveyance belt. The figure explaining a mode. FIGS. 4A to 4C are diagrams illustrating a state in which overlapping paper is conveyed by a conveyance roller. The general | schematic principal part external appearance perspective view in 2nd Example. FIG. 3 is an external perspective view of a transport belt that changes the surface of a transported paper from a horizontal direction to a gravity direction. The figure which shows a mode when an ink is ejected by making the surface of paper into a gravity direction. (A), (b) The figure which shows a mode that paper is pinched | interposed and conveyed by the conveyance roller. The general | schematic principal part external appearance perspective view in 4th Example.

Explanation of symbols

  10, 10a, 13, 13a ... head, 11, 12, 15, 16, 11a, 12a, 15a, 16a, 32, 33, 34, 42, 43, 44 ... transport roller, 20 ... transport belt, 21, 22 ... Drive roller, 30, 40 ... conveying surface, 31, 41 ... paper feed roller, S1, S2 ... paper.

Claims (6)

A first head having a nozzle for ejecting liquid;
A second head that has a nozzle facing the nozzle of the first head and ejects liquid from the nozzle;
An overlapping unit that obtains media one by one and puts the two media in an overlapping state;
A liquid ejecting apparatus, comprising: a transport unit configured to transport the two media in a state of being overlapped at a position where the nozzle of the first head and the nozzle of the second head face each other. apparatus. The liquid ejecting apparatus according to claim 1,
The superimposing unit includes a first acquisition unit and a second acquisition unit that respectively acquire one medium.
The liquid ejecting apparatus according to claim 1, wherein the first acquisition unit and the second acquisition unit acquire the two media in a superimposed state by acquiring simultaneously. The liquid ejecting apparatus according to claim 1,
The superimposing unit is configured to acquire one medium;
A detection unit for detecting the acquired number of sheets,
The liquid ejecting apparatus according to claim 1, wherein the acquisition is stopped and the two media are overlapped each time the number of sheets becomes the second sheet. The liquid ejecting apparatus according to any one of claims 1 to 3,
The liquid ejecting apparatus according to claim 1, wherein the transport unit transports the two media in a direction of gravity. The liquid ejecting apparatus according to any one of claims 1 to 4,
The overlapping unit includes a charging unit that causes the medium to be charged with static electricity,
A liquid ejecting apparatus, wherein the two media are adsorbed and overlapped by the static electricity. Injecting liquid from a nozzle provided in the first head;
Ejecting liquid from a nozzle provided in the second head;
A superimposing step of obtaining one medium at a time and superimposing the two mediums;
A liquid ejecting step comprising: conveying the two media in a state of being overlapped at a position where the nozzle of the first head and the nozzle of the second head face each other. Method.

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