WO2014156886A1

WO2014156886A1 - Inkjet printing device

Info

Publication number: WO2014156886A1
Application number: PCT/JP2014/057543
Authority: WO
Inventors: 宏幸岡
Original assignee: セーレン株式会社
Priority date: 2013-03-29
Filing date: 2014-03-19
Publication date: 2014-10-02
Also published as: JP6347777B2; JPWO2014156886A1

Abstract

The inkjet printing device is provided with a conveyance unit, a printing unit, a separating unit, and a detecting unit. The conveyance unit continuously conveys a long printing medium in the conveyance direction along the longitudinal direction of the printing medium. The printing unit is provided with a line-type inkjet heat. At an upstream region on the upstream side of the inkjet head in the conveyance direction and at a downstream region on the downstream side, the separating unit moves the printing medium, which is being conveyed by the conveyance unit, in a separating direction that increases the gap from the discharge surface of the inkjet head where multiple nozzles are formed. The separating unit moves the printing medium, which is being conveyed by the conveyance unit, when the detecting unit detects a printing medium joint or a portion of the printing medium in which the gap becomes narrower than the standard gap.

Description

Inkjet recording device

The present invention relates to an ink jet recording apparatus.

Technology related to inkjet recording devices has been proposed. Patent Document 1 discloses an ink jet recording apparatus. In this ink jet recording apparatus, restriction rollers are disposed immediately above and below the nozzle portion. The peripheral surface of the regulating roller protrudes from the tip surface of the nozzle portion by a predetermined distance. A plurality of conveyor belts are stretched around the regulation roller. According to this ink jet recording apparatus, the distance between the plurality of conveyor belts and the nozzle portion is kept constant. Thereby, the distance between the recording paper to be conveyed and the nozzle is constant, and the print quality can be improved. Patent Document 1 discloses the following. That is, during printing, feeding of the recording paper to the printing unit is temporarily stopped at a required interval. Then, the plurality of conveyor belts are temporarily retracted from between the head portions. Further, idle discharge is performed. In the idle ejection, ink is ejected from all the nozzles toward the ejection recovery unit. This prevents clogging of nozzles that are not used or are not used frequently during printing.

Japanese Patent Laid-Open No. 7-314822

There is an ink jet recording apparatus in which the recording unit includes a line type ink jet head. With such an ink jet recording apparatus, an image may be recorded on a long recording medium, and the recording medium may be patterned. The long recording medium may be formed by joining the longitudinal ends of the first member and the second member forming the recording medium by a predetermined method. In the ink jet recording apparatus, a long recording medium including a joint is continuously conveyed. The portion of the joint in the recording medium may be thicker than the portion of the long recording medium excluding the joint. This is due to the overlapping of the end portions of the first member and the second member or the fastening material used for joining. For this reason, when a long recording medium including a seam that may be thick is conveyed, it is necessary to prevent the seam from coming into contact with the ejection surface. The ejection surface is a surface on which nozzles for ejecting ink are formed in the inkjet head. In order to prevent contact between the joint and the ejection surface, a measure is taken such that the gap between the ejection surface and the recording medium is a distance based on the thickness of the joint. However, with such a measure, the gap described above becomes wide in the portion of the long recording medium excluding the joint. As a result, it may not be possible to perform image recording with suitable quality. In the case of a long recording medium, the following may be assumed in addition to the joints as a part of the thickness is increased. For example, it is assumed that the recording medium is twisted, foreign matter is attached, or the recording surface is fluffed.

The present invention provides a discharge medium in which a part of a thick portion such as a joint is formed with a nozzle by a line-type inkjet head, even if the recording medium includes a thick portion such as a joint. An object of the present invention is to provide an ink jet recording apparatus capable of suppressing contact with a surface.

One aspect of the present invention is a conveyance unit that continuously conveys a long recording medium in a conveyance direction along a longitudinal direction of the recording medium, and a recording surface of the recording medium that is conveyed by the conveyance unit A recording unit including a line-type inkjet head formed with a plurality of nozzles that eject ink, and an upstream region upstream of the inkjet head and a downstream region downstream of the inkjet head in the transport direction. A separation unit that moves the recording medium conveyed by the conveyance unit in a separation direction in which a gap with the discharge surface on which the plurality of nozzles are formed is increased by the inkjet head; and the upstream region. Forming the recording medium positioned downstream in the transport direction in a transport state in which the recording medium is transported by the transport unit A joint of the recording medium in which the upstream end of the material and the downstream end of the second member forming the recording medium located upstream in the transport direction in the transport state are joined together An ink jet recording apparatus that moves the recording medium conveyed by the conveying unit in the separating direction when the joint is detected by the detecting unit. is there.

According to this ink jet recording apparatus, the recording medium can be separated from the ejection surface according to the detection of the joint. The recording medium is moved in the separation direction in the upstream area and the downstream area. Therefore, the portion of the recording medium that faces the ejection surface can be moved in the separation direction. “Detection unit for detecting joints” is widely interpreted. For example, the “detection unit for detecting a joint” connects a part of the recording medium in which the first member and the second member are connected based on a change in the thickness of the recording medium in addition to the case of detecting the joint directly. It includes the case where it is detected as an eye.

This ink jet recording apparatus may be as follows. The separation unit includes an upstream roller that rotates following a direction corresponding to the conveyance direction in contact with the recording medium being conveyed in the upstream region by the conveyance unit, and the upstream in the separation direction. An upstream moving unit that moves the side roller, and a downstream roller that rotates following the direction corresponding to the transport direction in contact with the recording medium transported in the downstream region by the transport unit, A downstream moving unit that moves the downstream roller in the separation direction. According to this, the recording medium can be smoothly conveyed in the conveying direction by the conveying unit while separating the recording medium from the ejection surface.

The ink jet recording apparatus includes a support unit that supports the recording medium transported by the transport unit from a side opposite to the recording surface of the recording medium, and the support unit is configured to support the recording medium. A support roller that rotates following a direction corresponding to the transport direction in contact with the recording medium transported by the transport unit on a surface opposite to the recording surface, and the upstream by the upstream moving unit. A support moving unit that moves the support roller in the separating direction in response to the movement of the side roller in the separating direction and the movement of the downstream roller in the separating direction by the downstream moving unit; May be provided. According to this, in a state where the recording medium is supported from the surface opposite to the recording surface, the portion of the recording medium that faces the ejection surface can be moved in the separation direction. With the recording medium supported from the surface opposite to the recording surface, the recording medium can be smoothly conveyed in the conveying direction by the conveying unit.

The transport unit includes a first transport unit that transports the first recording medium as the recording medium in the transport direction, and a second recording medium that serves as the recording medium in the short direction of the first recording medium. A second transport unit that transports in the transport direction in a state of being aligned with the first recording medium, and the recording unit is configured to provide ink on a recording surface of the first recording medium transported by the first transport unit. A line-type first inkjet head in which a first nozzle of the plurality of nozzles is formed, and the recording surface of the second recording medium transported by the second transport unit. A line-type second inkjet head in which a second nozzle of a plurality of nozzles is formed, and the separation portion is conveyed by the first conveyance unit between the upstream region and the downstream region. Said first The recording medium is moved in the separation direction by the first separation section that moves in the separation direction, the upstream area, and the downstream area, and the second recording medium that is being conveyed by the second conveyance section. A second separating portion, wherein the detection portion is provided in the upstream region corresponding to the first recording medium being transported by the first transporting portion, and is connected to the first recording medium. A first detector for detecting a first seam as an eye, and provided in the upstream region corresponding to the second recording medium being conveyed by the second conveying unit; A second detection unit that detects a second seam as a joint, and the first separation unit is configured by the first transport unit when the first joint is detected by the first detection unit. The first recording medium being conveyed is The second separation unit moves the second recording medium conveyed by the second conveyance unit in the separation direction when the second joint is detected by the second detection unit. You may make it move.

According to this, the first recording medium can be separated from the ejection surface of the first inkjet head in response to detection of the first joint. In response to the detection of the second joint, the second recording medium can be separated from the ejection surface of the second inkjet head. The separation operation by the first separation portion and the separation operation by the second separation portion can be performed independently. An image can be recorded on the first recording medium while the first recording medium is conveyed, and an image can be recorded on the second recording medium while the second recording medium is conveyed. Images can be recorded efficiently. Control relating to image recording on the first recording medium and control relating to image recording on the second recording medium can be performed independently. Control relating to recording of an image on the first recording medium can be associated with the separation operation by the first separation unit. Control relating to recording of an image on the second recording medium can be associated with the separation operation by the second separation unit. The first recording medium and the second recording medium may be different recording media or may be a single recording medium. In the case of a single recording medium, the first recording medium is, for example, a portion of the recording medium that is transported with the front surface being the recording surface, and the second recording medium is transported with the back surface being the recording surface. Part of the recording medium to be recorded.

The first separation portion is a first roller that rotates following a direction corresponding to the transport direction in contact with the first recording medium transported in the upstream area by the first transport portion; In a direction corresponding to the transport direction in contact with the first moving unit that moves the first roller in the separation direction and the first recording medium that is transported in the downstream area by the first transport unit. A second roller that rotates following the rotation, and a second moving unit that moves the second roller in the separation direction, and the second separation unit is conveyed in the upstream region by the second conveyance unit. A third roller that rotates following the direction corresponding to the transport direction in contact with the second recording medium, a third moving unit that moves the third roller in the separation direction, and the second The downstream area is transported by the transport unit. A fourth roller that rotates following a direction corresponding to the transport direction in contact with the second recording medium, and a fourth moving unit that moves the fourth roller in the separation direction. You may do it. According to this, the first recording medium can be smoothly conveyed in the conveying direction by the first conveying unit while the first recording medium is separated from the ejection surface of the first inkjet head. The second recording medium can be smoothly transported in the transport direction by the second transport unit while separating the second recording medium from the ejection surface of the second inkjet head.

The inkjet recording apparatus includes a first support unit that supports the first recording medium conveyed by the first conveying unit from a side opposite to a recording surface of the first recording medium; A second support part that supports the second recording medium being transported by a second transport part from a side opposite to the recording surface of the second recording medium, and the first support part comprises: A first rotating member that is driven by a direction corresponding to the conveying direction in contact with the first recording medium conveyed by the first conveying unit on a surface opposite to the recording surface of the first recording medium. The first roller corresponding to the movement of the first roller in the separation direction by the support roller and the first movement unit, and the movement of the second roller in the separation direction by the second movement unit, A first support moving unit that moves the support roller in the separating direction; The second support portion corresponds to the transport direction in a state where the second support portion is in contact with the second recording medium transported by the second transport portion on a surface opposite to the recording surface of the second recording medium. A second support roller that rotates following the direction, a movement of the third roller in the separation direction by the third movement unit, and a movement of the fourth roller in the separation direction by the fourth movement unit; And a second support moving unit that moves the second support roller in the separation direction.

According to this, in the state where the first recording medium is supported from the surface opposite to the recording surface, the portion of the first recording medium facing the ejection surface can be moved in the separation direction. With the first recording medium supported from the surface opposite to the recording surface, the first recording medium can be smoothly transported in the transport direction by the first transport unit. With the second recording medium supported from the surface opposite to the recording surface, the portion of the second recording medium that faces the ejection surface can be moved in the separation direction. With the second recording medium supported from the surface opposite to the recording surface, the second recording medium can be smoothly conveyed in the conveying direction by the second conveying unit.

Another aspect of the present invention provides a transport unit that continuously transports a long recording medium in a transport direction along a longitudinal direction of the recording medium, and recording of the recording medium transported by the transport unit. A recording unit including a line-type inkjet head formed with a plurality of nozzles that eject ink on the surface; an upstream region upstream of the inkjet head in the transport direction; and a downstream region downstream of the inkjet head The recording medium being transported by the transport unit is provided in the upstream region, and a separation unit that moves in a separation direction in which a gap with the ejection surface on which the plurality of nozzles are formed is increased by the inkjet head. And the gap is narrower than a reference gap which is a predetermined reference in the recording medium being transported by the transport unit. A detecting unit that detects a portion of the recording medium, and the separation unit is conveyed by the conveying unit when the detecting unit detects a portion of the recording medium in which the gap is narrower than the reference gap. An inkjet recording apparatus that moves the recording medium in the separation direction.

According to this ink jet recording apparatus, the recording medium can be separated from the ejection surface in response to detection of a portion of the recording medium that becomes narrower than the reference gap. The recording medium is moved in the separation direction in the upstream area and the downstream area. Therefore, the portion of the recording medium that faces the ejection surface can be moved in the separation direction.

According to the present invention, even in a recording medium that includes a thick portion such as a joint in part, the nozzle is formed in a part of the thick portion such as a joint by a line-type inkjet head. An ink jet recording apparatus that can suppress contact with the discharged ejection surface can be obtained.

It is a top view which shows an example of an inkjet recording device. FIG. 2 is a front view showing an example of the ink jet recording apparatus as viewed in the Y direction shown in FIG. 1. It is a perspective view which shows an example of the joint in a elongate recording medium. It is the figure which looked at the 1st ink jet head and the 2nd ink jet head from the side of the discharge surface in which the nozzle was formed, the positional relationship of the 1st ink jet head and the 1st recording medium, and the 2nd ink jet head and the 2nd recording medium It is a figure which shows an example of positional relationship. FIG. 3 is a front view showing the ink jet recording apparatus in a state where the recording medium is separated from the ejection surface from the state shown in FIG. 2. It is a front view which shows the other example of an inkjet recording device corresponding to the Y direction arrow line view shown in FIG. FIG. 7 is a front view showing the ink jet recording apparatus in a state where the recording medium is separated from the ejection surface from the state shown in FIG.

Embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to the configurations described below, and various configurations can be employed in the same technical idea. For example, some of the configurations shown below may be omitted or replaced with other configurations. Other configurations may be included.

<Inkjet recording apparatus>
The ink jet recording apparatus 10 will be described with reference to FIGS. In FIGS. 2 and 5 and FIGS. 6 and 7 to be described later, arc-shaped arrows shown inside the rollers included in the inkjet recording apparatus 10 indicate the rotation directions of the rollers. In the inkjet recording apparatus 10, a long recording medium 12 is conveyed, and an image is recorded on the recording surface 14 of the recording medium 12. In this embodiment, the ink colors used for image recording are four colors of yellow, magenta, cyan, and black. The ink color may be other colors and the number of colors. As shown in FIGS. 1 and 2, the ink jet recording apparatus 10 includes a conveyance unit 20, a recording unit 60, a separation unit 80, and a control device 110.

The transport unit 20 continuously transports the recording medium 12 in the transport direction. The transport direction is a direction along the longitudinal direction of the recording medium 12. The transport unit 20 includes a first transport unit 21 and a second transport unit 22. The first transport unit 21 transports the first recording medium 12A as the recording medium 12 in the transport direction. The first recording medium 12 A is transported by the first transport unit 21 and passes through the recording unit 60. The second transport unit 22 transports the second recording medium 12B as the recording medium 12 in the transport direction. The second recording medium 12 B is transported by the second transport unit 22 and passes through the recording unit 60. In the ink jet recording apparatus 10, the first transport unit 21 and the second transport unit 22 are provided side by side in the short direction of the recording medium 12 (see FIG. 1). The short side direction of the recording medium 12 is the width direction of the recording medium 12. Therefore, the first recording medium 12A and the second recording medium 12B are transported in the transport direction in a state of being aligned in the short direction.

Examples of the recording medium 12 include a fabric. When the recording medium 12 is formed of a cloth, the long recording medium 12 is formed by connecting a plurality of cloths having a predetermined length. Specifically, the long recording medium 12 is formed by joining a first end portion in the longitudinal direction of the first fabric and a second end portion in the longitudinal direction of the second fabric by a predetermined method. . Each of the first fabric and the second fabric is a fabric having a predetermined length. Examples of the method for joining the fabrics include a method using sewing, an adhesive tape, or a stapler. The recording medium 12 shown in FIG. 3 is obtained by laminating two fabrics and sewing them at two locations. In the present embodiment, a portion where members forming the recording medium 12 such as a fabric are joined is referred to as a “joint 16”. When distinguishing the “joint 16” in each of the first recording medium 12A and the second recording medium 12B, it is referred to as “first joint 16A” or “second joint 16B”. The first joint 16A is the joint 16 of the first recording medium 12A. The second joint 16B is the joint 16 of the second recording medium 12B.

Regarding the first recording medium 12A and the second recording medium 12B, it is assumed that the recording medium 12 is a single recording medium. The first recording medium 12A is a part of the recording medium 12 that is conveyed with the front surface 14A facing the ejection surface 70 as the recording surface 14 of the front surface 14A and the back surface 14B of the recording medium 12 (FIGS. 1 and 2). 5 and FIG. 6 and FIG. 7 described later). In the first recording medium 12A, the ink lands on the surface 14A, and an image is recorded on the surface 14A. The second recording medium 12B is a portion of the recording medium 12 that is conveyed with the back surface 14B facing the ejection surface 70 as the recording surface 14 of the front surface 14A and the back surface 14B of the recording medium 12 (see FIG. 1). In the second recording medium 12B, the ink lands on the back surface 14B, and an image is recorded on the back surface 14B. The first recording medium 12A and the second recording medium 12B may be separate recording media 12, respectively. In this case, the first recording medium 12A is conveyed, for example, with the surface 14A facing the ejection surface 70 as the recording surface 14 (see FIGS. 1, 2, and 5 and FIGS. 6 and 7 described later). The ink lands on the surface 14A, and an image is recorded on the surface 14A. For example, the second recording medium 12B is conveyed in a state where the surface 14A faces the ejection surface 70 as the recording surface 14 (not shown). The ink lands on the surface 14A, and an image is recorded on the surface 14A. The ejection surface 70 is a surface on which nozzles 68 for ejecting ink are formed in the first inkjet head 64 and the second inkjet head 66 included in the recording unit 60 (see FIG. 4). In the present embodiment, the first recording medium 12 A and the second recording medium 12 B are not distinguished or are collectively referred to as “recording medium 12”.

The first transport unit 21 and the second transport unit 22 are similar transport units. Therefore, the 1st conveyance part 21 and the 2nd conveyance part 22 are equipped with the same structure. The first transport unit 21 and the second transport unit 22 are both a fifth roller 30, a sixth roller 32, a seventh roller 34, an eighth roller 36, a ninth roller 38, and a first rotating shaft 40. A second rotating shaft 42, a third rotating shaft 44, a first motor 50, a second motor 52, and a third motor 54. In the 1st conveyance part 21 and the 2nd conveyance part 22, the 5th roller 30 is fixed to the 1st rotating shaft 40, as shown in FIG. The fifth roller 30 is in contact with the surface opposite to the recording surface 14. When the recording surface 14 is the front surface 14A, the “surface opposite to the recording surface 14” is the back surface 14B. When the recording surface 14 is the back surface 14B, the “surface opposite to the recording surface 14” is the front surface 14A. The first rotating shaft 40 is connected to the first motor 50. The first motor 50 rotates the first rotating shaft 40 in a direction corresponding to the transport direction. Thereby, in the 1st conveyance part 21 and the 2nd conveyance part 22, the 5th roller 30 rotates in the direction corresponding to a conveyance direction.

In the first transport unit 21 and the second transport unit 22, the sixth roller 32 is provided on the upper side of the fifth roller 30 so as to face the peripheral side surface of the fifth roller 30 as shown in FIGS. 1 and 2. The sixth roller 32 is in contact with the recording surface 14. The sixth roller 32 is urged toward the fifth roller 30 by an urging unit (not shown). The biased direction is the lower side in the vertical direction based on FIG. The biased sixth roller 32 presses the recording medium 12 against the peripheral side surface of the fifth roller 30. The sixth roller 32 is fixed to a predetermined rotating shaft. The sixth roller 32 rotates following the direction corresponding to the transport direction while in contact with the recording surface 14.

In the first transport unit 21 and the second transport unit 22, the seventh roller 34 is fixed to the second rotating shaft 42 as shown in FIG. The seventh roller 34 is in contact with the surface opposite to the recording surface 14. The surface opposite to the recording surface 14 is as described above. The second rotating shaft 42 is connected to the second motor 52. The second motor 52 rotates the second rotating shaft 42 in a direction corresponding to the transport direction. The second motor 52 is a motor serving as a drive source for transporting the recording medium 12 in the transport direction. As the second motor 52, for example, a motor that can accurately control rotation, such as a servo motor, is employed. In the first transport unit 21 and the second transport unit 22, the seventh roller 34 rotates in a direction corresponding to the transport direction in a state where the rotation is controlled by the second motor 52.

In the first transport unit 21 and the second transport unit 22, the eighth roller 36 is fixed to the third rotating shaft 44 as shown in FIG. The eighth roller 36 is in contact with the surface opposite to the recording surface 14. The surface opposite to the recording surface 14 is as described above. The third rotating shaft 44 is connected to the third motor 54. The third motor 54 rotates the third rotating shaft 44 in a direction corresponding to the transport direction. Thereby, in the first transport unit 21 and the second transport unit 22, the eighth roller 36 rotates in a direction corresponding to the transport direction. The ninth roller 38 is a roller called a dancer roller. In the 1st conveyance part 21 and the 2nd conveyance part 22, the 9th roller 38 is each urged | biased by the urging | biasing part not shown. For example, the ninth rollers 38 are urged downward in the vertical direction (see FIG. 2). Examples of the urging unit that urges the ninth roller 38 include a spring, a weight, or an actuator. An example of the actuator is an air cylinder. The ninth roller 38 is fixed to a predetermined rotating shaft. The ninth roller 38 rotates following the direction corresponding to the transport direction while in contact with the recording surface 14.

Thus, the first transport unit 21 and the second transport unit 22 include the fifth roller 30, the first rotation shaft 40 and the first motor 50, the seventh roller 34, the second rotation shaft 42 and the second motor 52, The eighth roller 36, the third rotating shaft 44, the third motor 54, the sixth roller 32, and the ninth roller 38 are provided independently. Therefore, the conveyance speed in the 1st conveyance part 21 and the conveyance speed in the 2nd conveyance part 22 can be set separately. For example, the respective transport speeds in the first transport unit 21 and the second transport unit 22 are the first recording medium 12A transported by the first transport unit 21 and the second recording medium 12B transported by the second transport unit 22. These are set in consideration of the contraction state of each recording medium 12. In the 1st conveyance part 21 and the 2nd conveyance part 22, an appropriate conveyance speed can be set in each considering the point etc. which were mentioned above.

In the first transport unit 21 and the second transport unit 22, the first rotary shaft 40, the second rotary shaft 42, the third rotary shaft 44, the first motor 50, the second motor 52, and the third motor 54. May be shared. In this case, the fifth roller 30 of the first transport unit 21 and the fifth roller 30 of the second transport unit 22 are respectively fixed to one first rotation shaft at each position shown in FIG. One first motor is connected to the first rotating shaft. The first motor rotates the first rotation shaft in a direction corresponding to the transport direction. As a result, the two fifth rollers 30 rotate in a direction corresponding to the transport direction. The seventh roller 34 of the first transport unit 21 and the seventh roller 34 of the second transport unit 22 are fixed to one second rotation shaft, for example, at each position shown in FIG. One second motor is connected to the second rotating shaft. The second motor rotates the second rotation shaft in a direction corresponding to the transport direction. As a result, the two seventh rollers 34 rotate in a direction corresponding to the transport direction. For example, the eighth roller 36 of the first transport unit 21 and the eighth roller 36 of the second transport unit 22 are fixed to one third rotation shaft at each position shown in FIG. One third motor is connected to the third rotating shaft. The third motor rotates the third rotation shaft in a direction corresponding to the transport direction. As a result, the two eighth rollers 36 rotate in a direction corresponding to the transport direction.

Suppose that the first transport unit 21 and the second transport unit 22 are configured as described above. That is, the two fifth rollers 30 are both fixed to one first rotating shaft, and the first rotating shaft is rotated by one first motor. The two seventh rollers 34 are both fixed to one second rotating shaft, and the second rotating shaft is rotated by one second motor. The two eighth rollers 36 are both fixed to one third rotating shaft, and this third rotating shaft is rotated by one third motor. According to such a configuration, the transport speed of the first recording medium 12A in the first transport unit 21 and the transport speed of the second recording medium 12B in the second transport unit 22 can be made equal. An increase in the number of parts can be suppressed, and the structure of the transport unit 20 can be simplified. The sixth roller 32 of the first transport unit 21 and the sixth roller 32 of the second transport unit 22 may also be configured to be fixed to one rotating shaft, like the fifth roller 30 and the like. The ninth roller 38 of the first transport unit 21 and the ninth roller 38 of the second transport unit 22 may also be configured to be fixed to one rotating shaft, like the fifth roller 30 and the like.

In the first motor 50 and the second motor 52, the rotation speed of the second motor 52 is higher than the rotation speed of the first motor 50. That is, the seventh roller 34 provided on the downstream side in the transport direction from the recording unit 60 rotates at a higher speed than the fifth roller 30 provided on the upstream side in the transport direction from the recording unit 60. By making the seventh roller 34 rotate at a higher speed than the fifth roller 30, tension can be applied to the portion of the recording medium 12 being conveyed in the conveyance direction between the fifth roller 30 and the seventh roller 34. . Therefore, the portion of the first recording medium 12 A between the fifth roller 30 and the seventh roller 34 in the first transport unit 21 is tightly stretched. Similarly, the portion of the second recording medium 12 B between the fifth roller 30 and the seventh roller 34 in the second transport unit 22 is in a tight state. The portion of the recording medium 12 between the fifth roller 30 and the seventh roller 34 includes the portion of the recording medium 12 that faces the ejection surface 70.

In the first transport unit 21, the rotation of the third motor 54 is controlled, and accordingly, the vertical position of the ninth roller 38 is controlled, so that the first recording medium 12 A is moved with a constant force by the seventh roller 34. Pressed. As a result, the slip between the first recording medium 12A and the peripheral side surface of the seventh roller 34 is suppressed. In the second transport unit 22, the rotation of the third motor 54 is controlled, and in accordance with this, the vertical position of the ninth roller 38 is controlled, so that the second recording medium 12 B moves with the constant force to the seventh roller 34. Pressed. As a result, slippage between the second recording medium 12B and the peripheral side surface of the seventh roller 34 is suppressed. In this manner, the first transport unit 21 can accurately transport the first recording medium 12A in the transport direction in a state where tension is applied to the first recording medium 12A. The second transport unit 22 can accurately transport the second recording medium 12B in the transport direction in a state where tension is applied to the second recording medium 12B.

The recording unit 60 includes a first inkjet head 64Y and a second inkjet head 66Y, a first inkjet head 64M and a second inkjet head 66M, a first inkjet head 64C and a second inkjet head 66C, a first inkjet head 64K, and A second inkjet head 66K and a carriage 72 are provided. The first inkjet head 64Y and the second inkjet head 66Y are inkjet heads that discharge yellow ink. The first inkjet head 64M and the second inkjet head 66M are inkjet heads that eject magenta ink. The first inkjet head 64C and the second inkjet head 66C are inkjet heads that discharge cyan ink. The first inkjet head 64K and the second inkjet head 66K are inkjet heads that discharge black ink.

The first inkjet heads 64Y, 64M, 64C, and 64K have the same configuration. The second inkjet heads 66Y, 66M, 66C, 66K have the same configuration. The first inkjet heads 64Y, 64M, 64C, and 64K and the second inkjet heads 66Y, 66M, 66C, and 66K have the same configuration. In the present embodiment, the first inkjet heads 64Y, 64M, 64C, and 64K are referred to as “first inkjet heads 64” when they are not distinguished or are collectively referred to. When the second inkjet heads 66Y, 66M, 66C, and 66K are not distinguished from each other or are collectively referred to as “second inkjet head 66”. Each color ink is stored in an ink tank (not shown) for each color. The ink of each color stored in the ink tank of each color flows through the ink flow path (not shown) of each color and is supplied to the first ink jet head 64 and the second ink jet head 66 of the corresponding color.

The first inkjet head 64 is a line-type inkjet head provided corresponding to the first recording medium 12 A conveyed by the first conveyance unit 21. The second inkjet head 66 is a line-type inkjet head provided corresponding to the second recording medium 12 B conveyed by the second conveyance unit 22. In the first inkjet head 64 that is a line-type inkjet head, nozzles 68 that eject ink of each color are arranged in a direction orthogonal to the transport direction. For example, in the first inkjet head 64, the nozzles 68 are formed in a range H that is equal to or greater than the width WA of the first recording medium 12A in a direction orthogonal to the transport direction (see FIG. 4). In the second inkjet head 66 that is a line-type inkjet head, nozzles 68 that eject ink of each color are arranged in a direction orthogonal to the transport direction. For example, in the second inkjet head 66, the nozzle 68 is formed in a range H that is equal to or larger than the width WB of the second recording medium 12B in the direction orthogonal to the transport direction (see FIG. 4). In FIG. 4, the first recording medium 12A and the second recording medium 12B are illustrated by a two-dot chain line. The direction orthogonal to the transport direction coincides with the short direction of the recording medium 12.

The carriage 72 is mounted with a first inkjet head 64 and a second inkjet head 66 for each color. As shown in FIGS. 1 and 4, the first inkjet heads 64 Y, 64 M, 64 C, and 64 K are arranged adjacent to each other in the transport direction and mounted on the carriage 72. As shown in FIGS. 1 and 4, the second inkjet heads 66 Y, 66 M, 66 C, 66 K are arranged adjacent to each other in the transport direction and mounted on the carriage 72. At that time, the first inkjet head 64 and the second inkjet head 66 of the same color are provided, for example, in a state adjacent to each other in a direction orthogonal to the transport direction. However, the first inkjet head 64Y and the second inkjet head 66Y, the first inkjet head 64M and the second inkjet head 66M, the first inkjet head 64C and the second inkjet head 66C, the first inkjet head 64K and the second inkjet head. The arrangement of the heads 66K may be an order different from that shown in FIG. These arrangement orders are appropriately determined in consideration of various conditions. The first inkjet head 64 and the second inkjet head 66 of the same color may be shifted in the transport direction, and a total of eight first inkjet heads 64 and second inkjet heads 66 may be arranged in a staggered manner.

When an image is recorded on the first recording medium 12A by the ink jet recording apparatus 10, ink of each color is applied to the first recording medium 12A from the nozzles 68 respectively formed on the first ink jet heads 64Y, 64M, 64C, and 64K. It is discharged toward. The inks of the respective colors ejected from the nozzles 68 of the first inkjet heads 64Y, 64M, 64C, and 64K land on the recording surface 14 of the first recording medium 12A. When an image is recorded on the second recording medium 12B, ink of each color is ejected toward the second recording medium 12B from the nozzles 68 formed on the second inkjet heads 66Y, 66M, 66C, and 66K. The inks of the respective colors ejected from the nozzles 68 of the second inkjet heads 66Y, 66M, 66C, 66K land on the recording surface 14 of the second recording medium 12B.

The gap between the ejection surface 70 and the first recording medium 12A when an image is recorded on the first recording medium 12A is appropriately set in consideration of various conditions. The gap between the ejection surface 70 and the second recording medium 12B when an image is recorded on the second recording medium 12B is appropriately set in consideration of various conditions. Each gap described above is specifically the interval between the ejection surface 70 and the recording surface 14 of the first recording medium 12A, or the interval between the ejection surface 70 and the recording surface 14 of the second recording medium 12B. For example, the above-described gaps are set to the same predetermined gap G5 (see FIG. 2). The gap G 5 is a reference gap when an image is recorded on the first recording medium 12 A by the first inkjet head 64 and an image is recorded on the second recording medium 12 B by the second inkjet head 66. In FIGS. 2 and 5 and FIGS. 6 and 7 to be described later, the first joint 16A is not shown. In FIG. 2 and FIG. 6 described later, the gap between the ejection surface 70 and the first recording medium 12A is broadly illustrated with respect to the thickness of the first recording medium 12A and the like so that the gap G5 is clear.

The separation unit 80 includes a first separation unit 81 and a second separation unit 90. The first separation unit 81 is provided corresponding to the first recording medium 12 A conveyed by the first conveyance unit 21. The second separation unit 90 is provided corresponding to the second recording medium 12 B conveyed by the second conveyance unit 22. The first separation portion 81 includes a first upstream separation portion 82 and a first downstream separation portion 85. The second separation portion 90 includes a second upstream separation portion 91 and a second downstream separation portion 94.

The first upstream separation portion 82 is provided above the recording surface 14 of the first recording medium 12A and at a predetermined position in the region R1 in the transport direction. The region R1 is a region on the upstream side in the transport direction from the first inkjet head 64Y and the second inkjet head 66Y provided on the most upstream side in the transport direction in the recording unit 60 and on the downstream side in the transport direction from the fifth roller 30. Yes (see FIG. 1). The first upstream separation portion 82 includes a first roller 83 and a first moving portion 84. The first roller 83 is in contact with the first recording medium 12A being conveyed in a state where tension is applied between the fifth roller 30 and the seventh roller 34 at a predetermined position in the region R1. Specifically, the first roller 83 contacts the recording surface 14 of the first recording medium 12A at the position described above. The first moving unit 84 moves the first roller 83 in the separating direction and the approaching direction. The 1st moving part 84 is comprised by actuators, such as an air cylinder, for example. The first roller 83 is rotatably attached to the first moving unit 84. For example, when the 1st moving part 84 is an air cylinder, the 1st roller 83 is rotatably attached to the front-end | tip part of the rod of the air cylinder which expands / contracts. The first roller 83 is attached to the first moving unit 84 and rotates following the direction corresponding to the transport direction in contact with the first recording medium 12A transported in the transport direction by the first transport unit 21. To do. When the gap between the ejection surface 70 and the first recording medium 12A is the gap G5, the first upstream separating portion 82 is in a state where the first roller 83 is separated from the first recording medium 12A (see FIG. 2). It becomes possible to keep the recording surface 14 in a suitable state.

The separation direction is a direction in which the gap G5 between the ejection surface 70 and the recording medium 12 (the first recording medium 12A and the second recording medium 12B) increases. In other words, the separation direction is a direction in which the portion of the recording medium 12 that reaches the recording unit 60 and faces the ejection surface 70 is separated from the ejection surface 70. The “region R4” shown in FIGS. 2 and 5 corresponds to the portion of the recording medium 12 that faces the ejection surface 70 described above. The approach direction is a direction opposite to the separation direction. In the present embodiment, the separation direction is a direction in which the vertical direction is directed downward, and the approaching direction is a direction in which the vertical direction is directed upward (see FIGS. 2 and 5).

The first downstream separation portion 85 is provided above the recording surface 14 of the first recording medium 12A and at a predetermined position in the region R2 in the transport direction. The region R2 is a region on the downstream side in the transport direction from the first inkjet head 64K and the second inkjet head 66K provided on the most downstream side in the transport direction in the recording unit 60, and on the upstream side in the transport direction from the seventh roller 34. Yes (see FIG. 1). The first downstream side separating portion 85 includes a second roller 86 and a second moving portion 87. The second roller 86 is in contact with the first recording medium 12A being conveyed in a state where tension is applied between the fifth roller 30 and the seventh roller 34 at a predetermined position in the region R2. Specifically, the second roller 86 contacts the recording surface 14 of the first recording medium 12A at the position described above. The second moving unit 87 moves the second roller 86 in the separating direction and the approaching direction. The second moving unit 87 is configured by an actuator such as an air cylinder, for example. The second roller 86 is rotatably attached to the second moving part 87. For example, when the second moving portion 87 is an air cylinder, the second roller 86 is rotatably attached to the tip portion of the rod of the air cylinder that expands and contracts. The second roller 86 is attached to the second moving unit 87 and rotates by following the direction corresponding to the transport direction in contact with the first recording medium 12A transported in the transport direction by the first transport unit 21. To do. When the gap between the ejection surface 70 and the first recording medium 12A is the gap G5, the first downstream separating portion 85 is in a state where the second roller 86 is separated from the first recording medium 12A (see FIG. 2). It becomes possible to keep the recording surface 14 in a suitable state.

The second upstream separating portion 91 is provided above the recording surface 14 of the second recording medium 12B and at a predetermined position in the region R1 in the transport direction. In the present embodiment, the second upstream separation portion 91 is provided in a state of being aligned with the first upstream separation portion 82 in the lateral direction (see FIG. 1). The second upstream separating portion 91 includes a third roller 92 and a third moving portion 93. The third roller 92 is in contact with the second recording medium 12B being conveyed in a state where tension is applied between the fifth roller 30 and the seventh roller 34 at a predetermined position in the region R1. Specifically, the third roller 92 contacts the recording surface 14 of the second recording medium 12B at the position described above. The third moving unit 93 moves the third roller 92 in the separating direction and the approaching direction. The third moving unit 93 is configured by an actuator such as an air cylinder, for example. The third roller 92 is rotatably attached to the third moving unit 93. For example, when the third moving portion 93 is an air cylinder, the third roller 92 is rotatably attached to the tip portion of the rod of the air cylinder that expands and contracts. The third roller 92 is attached to the third moving unit 93 and rotates by following the direction corresponding to the transport direction in contact with the second recording medium 12B transported in the transport direction by the second transport unit 22. To do. When the gap between the ejection surface 70 and the second recording medium 12B is the gap G5, the second upstream separating portion 91 is in a state in which the third roller 92 is separated from the second recording medium 12B. It becomes possible to keep the recording surface 14 in a suitable state.

The second downstream separation portion 94 is provided above the recording surface 14 of the second recording medium 12B and at a predetermined position in the region R2 in the transport direction. In the present embodiment, the second downstream separation portion 94 is provided in a state of being aligned with the first downstream separation portion 85 in the short direction (see FIG. 1). The second downstream separation portion 94 includes a fourth roller 95 and a fourth moving portion 96. The fourth roller 95 is in contact with the second recording medium 12B being conveyed in a state where tension is applied between the fifth roller 30 and the seventh roller 34 at a predetermined position in the region R2. Specifically, the fourth roller 95 is in contact with the recording surface 14 of the second recording medium 12B at the position described above. The fourth moving unit 96 moves the fourth roller 95 in the separating direction and the approaching direction. The fourth moving unit 96 is configured by an actuator such as an air cylinder, for example. The fourth roller 95 is rotatably attached to the fourth moving unit 96. For example, when the fourth moving unit 96 is an air cylinder, the fourth roller 95 is rotatably attached to the tip portion of the rod of the air cylinder that expands and contracts. The fourth roller 95 is rotated by following the direction corresponding to the transport direction in contact with the second recording medium 12B attached to the fourth moving unit 96 and transported by the second transport unit 22 in the transport direction. To do. When the gap between the ejection surface 70 and the second recording medium 12B is the gap G5, the second downstream separating portion 94 is in a state in which the fourth roller 95 is separated from the second recording medium 12B. It becomes possible to keep the recording surface 14 in a suitable state. In this embodiment, the 1st moving part 84, the 2nd moving part 87, the 3rd moving part 93, and the 4th moving part 96 are comprised by the air cylinder. When the gap between the ejection surface 70 and the recording medium 12 is the gap G5, the gap between the first roller 83 and the second roller 86 and the first recording medium 12A, the third roller 92 and the fourth roller 95, and the second recording medium 12B. These gaps are both G7 (see FIG. 2 and the same in FIG. 6 described later).

The first detection unit 100 is a sensor that detects the first joint 16A formed on the first recording medium 12A. A known contact-type or non-contact-type sensor is employed as the sensor constituting the first detection unit 100. The first detection unit 100 is provided corresponding to the first recording medium 12 A conveyed by the first conveyance unit 21. The first detection unit 100 is provided on the upstream side in the transport direction from the first inkjet head 64Y. In the present embodiment, the first detection unit 100 is provided at a predetermined position in the region R3. The region R3 is a region upstream of the first upstream separating portion 82 in the transport direction and further upstream of the fifth roller 30 in the transport direction (see FIG. 1). The position in the transport direction in which the first detection unit 100 is provided is based on the transport speed in the first transport unit 21 and the time required for the gap G5 to be the gap G6 (see FIG. 5) by the first separation operation described later. Set as appropriate.

The second detection unit 102 is a sensor that detects the second joint 16B formed on the second recording medium 12B. The second detection unit 102 is the same sensor as the first detection unit 100. The second detection unit 102 is provided corresponding to the second recording medium 12 B conveyed by the second conveyance unit 22. The second detection unit 102 is provided on the upstream side in the transport direction from the second inkjet head 66Y. In the present embodiment, the second detection unit 102 is provided at a predetermined position in the region R3, like the first detection unit 100. The position in the transport direction in which the second detection unit 102 is provided is appropriately set based on the transport speed in the second transport unit 22 and the time required to set the gap G5 to the gap G6 by the second separation operation described later.

The control device 110 includes a control unit 112 and an input / output unit 114. The control unit 112 executes computer programs for various processes executed by the inkjet recording apparatus 10. The control unit 112 controls the inkjet recording apparatus 10 by executing the computer program described above. The control unit 112 controls the ejection of ink of each color from the nozzles 68 formed on the first inkjet head 64 for each color. The control unit 112 controls ejection of ink of each color from the nozzles 68 formed in the second inkjet head 66 for each color. The ejection of each color ink by the first inkjet head 64 is controlled according to the first image data corresponding to the image recorded by the first inkjet head 64. The ejection of each color ink by the second inkjet head 66 is controlled according to the second image data corresponding to the image recorded by the second inkjet head 66.

The control unit 112 controls the detection of the first joint 16A by the first detection unit 100 and the detection of the second joint 16B by the second detection unit 102. The detection of the first joint 16A by the first detection unit 100 is determined by the following method, for example. The first detection unit 100 measures conduction between two points. Specifically, the first detection unit 100 measures the current that flows when the fastening material contacts two contact points. The fastening material is a member that joins the members forming the first recording medium 12A. Examples of the fastening material include a thread for sewing having conductivity (see FIG. 3). When the above-described current is measured by the first detection unit 100, the control unit 112 determines that the first joint 16A has been detected. The first detection unit 100 captures the recording surface 14. The control unit 112 analyzes the captured image. The control unit 112 determines the detection of the first joint 16A according to the analysis result. In addition, the first detection unit 100 measures the thickness of the first recording medium 12A or a change in thickness. The control unit 112 determines that the first joint 16A has been detected when the thickness or the change in thickness measured by the first detection unit 100 is equal to or greater than the reference value. That is, the portion of the first recording medium 12A where the thickness or the change in thickness is equal to or greater than the reference value is detected as the first joint 16A. The detection of the second joint 16B is performed in the same manner as in the case of the first joint 16A described above. The description regarding the detection of the second joint 16B is omitted.

The control unit 112 controls the separation operation. The separation operation includes a first separation operation by the first separation unit 81 and a second separation operation by the second separation unit 90. The first separation operation is a separation operation that is executed via the first separation unit 81 when the first joint 16A is detected. The second separation operation is a separation operation that is executed via the second separation unit 90 when the second joint 16B is detected. The separation operation will be described later.

The input / output unit 114 is a connection interface that connects a predetermined configuration to the control device 110. The detection result (signal) detected by the first detection unit 100 and the detection result (signal) detected by the second detection unit 102 are input to the control device 110 via the input / output unit 114. Control signals to the first moving unit 84 and the second moving unit 87, the third moving unit 93, the fourth moving unit 96, and the like are output via the input / output unit 114. Although illustration of wiring is omitted in FIGS. 1 and 2, control signals for ejecting ink to the first inkjet head 64 and the second inkjet head 66 are also output via the input / output unit 114. . When an information processing apparatus such as a personal computer is connected to the inkjet recording apparatus 10, the input / output unit 114 includes a connection interface for connection with the information processing apparatus. The first image data and the second image data described above may be input from the information processing apparatus to the inkjet recording apparatus 10.

As described above, when the first recording medium 12 A and the second recording medium 12 B are a single recording medium 12, the inkjet recording apparatus 10 includes a supply unit and a collection unit (not shown) in addition to the configuration described above. Prepare. The recording medium 12 is set in the supply unit. The recording medium 12 set in the supply unit is sent out from the supply unit. The supply unit has the same configuration as the supply unit provided in a known inkjet recording apparatus. The other description regarding a supply part is abbreviate | omitted. The recording medium 12 sent from the supply unit is transported in the transport direction by the first transport unit 21 as the first recording medium 12A. An image is recorded on the surface 14A of the first recording medium 12A conveyed by the first conveying unit 21 by the first inkjet heads 64Y, 64M, 64C, and 64K of the recording unit 60.

Thereafter, the first recording medium 12 A that has passed through the eighth roller 36 of the first transport unit 21 is transported to the upstream side of the second transport unit 22. In this case, the transport unit 20 includes a third transport unit (not shown) that connects the downstream side of the first transport unit 21 and the upstream side of the second transport unit 22. The third transport unit includes a reversing mechanism for reversing the front and back of the recording medium 12. The reversal by the reversing mechanism can be performed by employing a known reversing technique. Other description regarding the reversing mechanism is omitted. The second recording medium 12B in which the front and back surfaces of the recording medium 12 are reversed by the third transport unit and the back surface 14B is the recording surface 14 is transported again in the transport direction by the second transport unit 22. An image is recorded on the back surface 14B by the second inkjet heads 66Y, 66M, 66C, 66K of the recording unit 60 on the second recording medium 12B conveyed by the second conveying unit 22. Thereafter, the second recording medium 12B that has passed through the eighth roller 36 of the second transport unit 22 is recovered by the recovery unit. The collection unit has the same configuration as the collection unit provided in a known inkjet recording apparatus. The other description regarding a collection | recovery part is abbreviate | omitted.

In the case where the first recording medium 12A and the second recording medium 12B are separate recording media 12, the inkjet recording apparatus 10 includes, in addition to the configuration described above, a first supply unit, a first recovery unit, not shown, A second supply unit and a second recovery unit are provided. The first supply unit and the second recovery unit are a supply unit and a recovery unit corresponding to the first transport unit 21. The second supply unit and the second recovery unit are a supply unit and a recovery unit corresponding to the second transport unit 22. The first recording medium 12A is set in the first supply unit. The first recording medium 12A set in the first supply unit is sent out from the first supply unit. The first recording medium 12 A sent from the first supply unit is transported in the transport direction by the first transport unit 21. Images are recorded on the first recording medium 12 A conveyed by the first conveying unit 21 by the first inkjet heads 64 Y, 64 M, 64 C, and 64 K of the recording unit 60. Thereafter, the first recording medium 12A that has passed through the eighth roller 36 of the first transport unit 21 is collected by the first collection unit. The second recording medium 12B is set in the second supply unit. The second recording medium 12B set in the second supply unit is sent out from the second supply unit. The second recording medium 12B sent from the second supply unit is transported in the transport direction by the second transport unit 22. Images are recorded on the second recording medium 12 B transported by the second transport unit 22 by the second inkjet heads 66 Y, 66 M, 66 C, 66 K of the recording unit 60. Thereafter, the second recording medium 12B that has passed through the eighth roller 36 of the second transport unit 22 is collected by the second collection unit.

In the present embodiment, the second recording medium 12B is transported based on the second transport unit 22 and the second ink jet head 66 for each color, and passes through the ejection surface 70 by the second ink jet heads 66Y, 66M, 66C, 66K. The figure corresponding to FIG. 2 regarding the form is omitted. However, the form for the omitted second recording medium 12B is the same as the form for the first recording medium 12A shown in FIG. The same applies to FIGS. 5 to 7.

<Separation operation>
A separation operation performed through the separation unit 80 will be described. The first separation operation (see FIGS. 2 and 5) by the first separation unit 81 for the first recording medium 12A and the second separation operation by the second separation unit 90 for the second recording medium 12B are: Performed independently. That is, in the ink jet recording apparatus 10, the first separation operation is executed when the first joint 16 A is detected by the first detection unit 100 regardless of whether or not the second joint 16 B is detected. In the inkjet recording apparatus 10, the second separation operation is executed when the second joint 16 B is detected by the second detection unit 102 regardless of whether or not the first joint 16 A is detected.

In the inkjet recording apparatus 10, the detection of the first joint 16A and the second joint 16B is started as follows. That is, when the first transport unit 21 operates and the transport of the first recording medium 12A is started, the detection of the first joint 16A via the first detection unit 100 is started. When the second transport unit 22 operates and transport of the second recording medium 12B is started, detection of the second joint 16B via the second detection unit 102 is started. The control unit 112 acquires the detection result of the first detection unit 100 via the input / output unit 114. The control unit 112 determines whether or not the first joint 16A is detected according to the acquired detection result. The control unit 112 repeatedly executes the acquisition of the detection result by the first detection unit 100 and the determination described above. The control unit 112 acquires a detection result from the second detection unit 102 via the input / output unit 114. The control unit 112 determines whether or not the second joint 16B is detected according to the acquired detection result. The control unit 112 repeatedly executes the acquisition of the detection result by the second detection unit 102 and the above-described determination.

When it is determined that the first joint 16A has been detected, the control unit 112 controls the output of a control signal (down signal) to the first moving unit 84 and the second moving unit 87. In the first moving unit 84 and the second moving unit 87, the rod extends by a certain amount in the separating direction (downward in the vertical direction) in response to the descending signal. Accordingly, the first recording medium 12A that has been transported by the first transport unit 21 in the state shown in FIG. 2 is in a state in which each rod extends by a distance corresponding to the gap G7. It contacts the first roller 83 and the second roller 86 attached to the tip. Further, the first recording medium 12 A is pressed in the separation direction by the first roller 83 and the second roller 86 with the subsequent expansion of each rod. Compared with the state shown in FIG. 2, the first recording medium 12 A has the rods of the first moving part 84 and the second moving part 87 after the first roller 83 and the second roller 86 are in contact with the first recording medium 12 A. The portion of the longitudinal region R4 facing the discharge surface 70 is separated from the discharge surface 70 by a dimension corresponding to the amount of extension of the discharge surface 70. That is, the ejection surface 70 and the first recording medium 12A are in the state from the gap G5 to the gap G6 (see FIG. 5). The relationship between the gaps G5 and G6 is “gap G5 <gap G6”. Therefore, the gap enlargement amount is “gap G6−gap G5”.

When it is determined that the second joint 16B has been detected, the control unit 112 controls the output of a control signal (down signal) to the third moving unit 93 and the fourth moving unit 96. In the third moving unit 93 and the fourth moving unit 96, the rod extends by a certain amount in the separating direction (downward in the vertical direction) in response to the descending signal. Accordingly, the second recording medium 12B transported by the second transport unit 22 has a third roller attached to the tip of each of the extending rods with each rod extending by a distance corresponding to the gap G7. 92 and the fourth roller 95. Further, the second recording medium 12 B is pressed in the separation direction by the third roller 92 and the fourth roller 95 with the subsequent expansion of each rod. As in the case of the first recording medium 12A described above, the second recording medium 12B has the third moving part 93 and the fourth moving part 96 after the third roller 92 and the fourth roller 95 are in contact with the second recording medium 12B. The portion of the longitudinal region R4 facing the discharge surface 70 is separated from the discharge surface 70 by a size corresponding to the extension amount of each rod. That is, the ejection surface 70 and the second recording medium 12B are in the state from the gap G5 to the gap G6.

The first roller 83 and the second roller 86 are in contact with the first recording medium 12A being conveyed in the conveying direction and are rotated following the direction corresponding to the conveying direction (see FIG. 5). Therefore, even if the first recording medium 12A is pressed in the separation direction by the first roller 83 and the second roller 86, the first recording medium 12A can be smoothly conveyed in the conveyance direction. The third roller 92 and the fourth roller 95 are driven and rotated in a direction corresponding to the transport direction in contact with the second recording medium 12B transported in the transport direction. Therefore, even if the second recording medium 12B is pressed in the separation direction by the third roller 92 and the fourth roller 95, the second recording medium 12B can be smoothly conveyed in the conveyance direction.

After the descending signals for the first moving unit 84 and the second moving unit 87 are output, the first recording medium 12A is further conveyed in the conveying direction, and the first joint 16A is the first inkjet heads 64Y, 64M, 64C, 64K. It is assumed that the discharge surface 70 is passed. In this case, the control unit 112 controls the output of control signals (rising signals) to the first moving unit 84 and the second moving unit 87. In the first moving unit 84 and the second moving unit 87, the rod contracts by a certain amount in the approaching direction (upward in the vertical direction) in response to the rising signal. The contraction amount is “gap enlargement amount + gap G7”. Accordingly, the first recording medium 12A conveyed in the state as shown in FIG. 5 is in the state of the gap G5 before the first seam 16A is detected when the region R4 rises (see FIG. 2). ) The first recording medium 12A is transported in the transport direction in this state.

Regarding the passage of the first joint 16A, the control unit 112 determines that the first joint 16A has passed through the ejection surface 70, for example, when a predetermined reference time has elapsed after detecting the first joint 16A. To do. The first recording medium 12A is conveyed by the first conveying unit 21 at a constant speed. Therefore, the time required for passage can be obtained in advance from the transport speed in the first transport unit 21 and the distance from the position (detection position) where the first detection unit 100 is provided to the position that has passed through the ejection surface 70. . The control unit 112 determines the passage of the first joint 16A using a time longer than the time obtained in this way as a reference time.

In addition, the passage of the first joint 16A may be determined as follows. That is, a new detection unit is provided in the region R2. The passage of the first joint 16A is determined according to whether or not the first joint 16A is detected by the detection unit. The newly provided detection unit is provided corresponding to the first recording medium 12 A conveyed by the first conveyance unit 21. In this case, for example, a new detection unit is appropriately provided between the recording unit 60 and the first downstream side separation unit 85 or between the first downstream side separation unit 85 and the seventh roller 34 in the transport direction. The new detection unit is, for example, a sensor similar to the first detection unit 100.

After the descending signal is output to the third moving unit 93 and the fourth moving unit 96, the second recording medium 12B is further conveyed in the conveying direction, and the second joint 16B is the second inkjet heads 66Y, 66M, 66C, 66K. It is assumed that the discharge surface 70 is passed. In this case, the control unit 112 controls the output of control signals (rising signals) to the third moving unit 93 and the fourth moving unit 96. In the third moving unit 93 and the fourth moving unit 96, the rod contracts by a certain amount in the approaching direction (upper side in the vertical direction) in response to the rising signal. Accordingly, as in the case of the first recording medium 12A described above, the second recording medium 12B is in the state of the gap G5 before the portion of the region R4 is raised and the second joint 16B is detected. The second recording medium 12B is transported in the transport direction in this state.

The passage of the second joint 16B is determined according to whether or not a predetermined reference time has elapsed after detecting the second joint 16B, for example, as in the case of the first joint 16A. The reference time is set to a time equal to or longer than the time obtained from the transport speed in the second transport unit 22 and the distance from the position (detection position) where the second detection unit 102 is provided to the position passing through the ejection surface 70. The In addition, the passage of the second joint 16B may be determined as follows. That is, a new detection unit is provided in the region R2. The passage of the second joint 16B is determined according to whether or not the second joint 16B has been detected by the detection unit. The newly provided detection unit is provided corresponding to the second recording medium 12 B conveyed by the second conveyance unit 22. In this case, for example, the new detection unit is appropriately provided between the recording unit 60 and the second downstream separation unit 94 or between the second downstream separation unit 94 and the seventh roller 34 in the transport direction. The new detection unit is, for example, a sensor similar to the second detection unit 102.

The control unit 112 does not control the ejection of the ink according to the first image data after the descending signal is output for the first moving unit 84 and the second moving unit 87 until the ascending signal is output. . During this time, the ink of each color is forcibly discharged from all the nozzles 68 formed in the first inkjet heads 64Y, 64M, 64C, and 64K to the first recording medium 12A that has become the gap G6. May be. The control unit 112 does not control the ejection of ink according to the second image data after the descending signal is output for the third moving unit 93 and the fourth moving unit 96 until the ascending signal is output. . During this time, the ink of each color is forcibly discharged from all the nozzles 68 formed in the second inkjet heads 66Y, 66M, 66C, and 66K to the second recording medium 12B that has become the gap G6. May be.

Suppose that the first joint 16A passes through the ejection surface 70, and the gap between the ejection surface 70 and the first recording medium 12A becomes the gap G5. In this case, the control unit 112 controls again the ink ejection according to the first image data. It is assumed that the second joint 16B passes through the ejection surface 70 and the gap between the ejection surface 70 and the second recording medium 12B becomes the gap G5. In this case, the control unit 112 controls again the ink ejection according to the second image data. Thereby, the recording of the image corresponding to the first image data on the first recording medium 12A and the recording of the image corresponding to the second image data on the second recording medium 12B are resumed.

After the image recording is finished, the collected long recording medium 12 is separated at the joint 16. The long recording medium 12 is finally an individual member that forms the recording medium 12. The reason why the long recording medium 12 is provided with the joint 16 is to continuously perform image recording. Even if an image is recorded at the joint 16, the image at the joint 16 is recorded with a gap G6 wider than the gap G5 serving as a reference at the time of image recording. For this reason, the image of the joint 16 is an image with a reduced recording quality. In the member after separation, both end portions which were the joint 16 are not used. The image of the joint 16 is an unnecessary image that is not used. For example, as described above, the ink ejection according to the first image data and the second image data is stopped. According to such a configuration, unnecessary images are prevented from being recorded on the portion of the first recording medium 12A including the first joint 16A and the portion of the second recording medium 12B including the second joint 16B. can do. Then, a configuration is employed in which the ink is forcibly discharged using a portion of the recording medium 12 that is not used. Thereby, clogging of the nozzle 68 can be prevented.

<Effect of this embodiment>
According to this embodiment, the following effects can be obtained.

(1) In the ink jet recording apparatus 10, as shown in FIG. The recording medium 12 is transported in the transport direction by the transport unit 20 in a state of being bridged between the fifth roller 30 and the seventh roller 34. In the ink jet recording apparatus 10, the joint 16 is detected at a predetermined position in the region R3. When the joint 16 is detected, the separating unit 80 operates appropriately. Along with this, the recording medium 12 is moved in the separation direction at two locations, the region R1 and the region R2, so that the gap between the ejection surface 70 and the recording medium 12 changes from the gap G5 to the gap G6 (see FIG. 5). Therefore, the portion of the recording medium 12 that faces the ejection surface 70 can be moved in the separation direction. In the ink jet recording apparatus 10, it is possible to suppress the occurrence of a situation where the thick seam 16 contacts the ejection surface 70.

(2) In the inkjet recording apparatus 10, as shown in FIG. 1, a first transport unit 21 and a second transport unit 22 are provided. The recording unit 60 includes a line type first inkjet head 64 corresponding to the first recording medium 12 A conveyed by the first conveying unit 21 and a line corresponding to the second recording medium 12 B conveyed by the second conveying unit 22. A second ink jet head 66 of the type is provided (see FIG. 1). In addition, in the inkjet recording apparatus 10, a first separation portion 81 is provided corresponding to the first recording medium 12A, and a second separation portion 90 is provided corresponding to the second recording medium 12B (see FIG. 1). . Therefore, an image can be efficiently recorded for the first recording medium 12A and the second recording medium 12B. Control related to image recording on the first recording medium 12 A can be associated with the first separation operation by the first separation unit 81. Control related to image recording on the second recording medium 12B can be associated with the second separation operation by the second separation unit 90.

(3) In the first separating portion 81, the first upstream separating portion 82 includes a first roller 83 and a first moving portion 84, and the first downstream separating portion 85 includes a second roller 86 and a second moving portion 87. Provide (see FIG. 1 etc.). In the second separating portion 90, the second upstream separating portion 91 includes a third roller 92 and a third moving portion 93, and the second downstream separating portion 94 includes a fourth roller 95 and a fourth moving portion 96 (see FIG. 1). The first roller 83, the second roller 86, the third roller 92, and the fourth roller 95 are rotatably attached to the first moving part 84, the second moving part 87, the third moving part 93, and the fourth moving part 96, respectively. It is done. Therefore, the first recording medium 12A can be smoothly conveyed in the conveying direction by the first conveying unit 21 while the first recording medium 12A is separated from the ejection surface 70 by the first inkjet heads 64Y, 64M, 64C, and 64K. . The second recording medium 12B can be smoothly transported in the transport direction by the second transport unit 22 while the second recording medium 12B is separated from the ejection surface 70 by the second inkjet heads 66Y, 66M, 66C, 66K.

<Modification>
This embodiment can also be performed as follows.

(1) In the above description, the conveyance unit 20 includes the first conveyance unit 21 and the second conveyance unit 22, and the recording unit 60 includes the first inkjet head 64 and the second inkjet head 66 as an example. (See FIGS. 1 and 4). The ink jet recording apparatus may have a configuration in which the second transport unit 22 and the second ink jet head 66 are omitted. In this case, the second separation portion 90 is also omitted. The transport unit is configured by the first transport unit 21. The recording unit is configured by the first inkjet head 64. The spacing portion is configured by the first spacing portion 81.

(2) In the above, an example in which the control unit 112 controls the first separation unit 81 according to the detection result of the first detection unit 100 and the first separation operation for the first recording medium 12A is executed as an example. (See FIGS. 2 and 5). The configuration in which the control unit 112 controls the second separation unit 90 in accordance with the detection result of the second detection unit 102 and the second separation operation for the second recording medium 12B is executed has been described as an example. Such a separation operation may be executed as follows. That is, the control device 110 includes a dedicated hardware circuit for each separation operation. Each of the above-described separation operations may be executed by, for example, inputting the detection results of the first detection unit 100 and the second detection unit 102 to this hardware circuit.

(3) In the above description, the configuration in which the first recording medium 12A is transported by the first transport unit 21 while being spanned between the fifth roller 30 and the seventh roller 34 has been described as an example (FIG. 2). And FIG. 5). In this configuration, the first recording medium 12 A is not supported from the surface opposite to the recording surface 14 between the fifth roller 30 and the seventh roller 34. The configuration in which the second recording medium 12 B is conveyed by the second conveyance unit 22 while being spanned between the fifth roller 30 and the seventh roller 34 has been described as an example. In this configuration, the second recording medium 12B is not supported between the fifth roller 30 and the seventh roller 34 from the side opposite to the recording surface 14.

The first recording medium 12A conveyed by the first conveying unit 21 in a state of being bridged between the fifth roller 30 and the seventh roller 34 is moved to a predetermined position between the fifth roller 30 and the seventh roller 34. Thus, the recording surface 14 may be supported from the side opposite to the recording surface 14. Such a configuration will be described with reference to FIGS. In this description, it is assumed that the opposite surface described above is the back surface 14B. In other words, the first recording medium 12A conveyed between the fifth roller 30 and the seventh roller 34 is supported from the back surface 14B side at a predetermined position therebetween. In this case, the inkjet recording apparatus 10 includes a support unit 120 in addition to the above-described units. The support unit 120 supports the first recording medium 12A from the back surface 14B side. In the example illustrated in FIG. 6, the inkjet recording apparatus 10 includes three support portions 120 with respect to the first recording medium 12 A. The number and arrangement of the support portions 120 are appropriately determined in consideration of various conditions.

The support portion 120 has the same configuration as the first upstream separation portion 82 and the first downstream separation portion 85 described above. That is, the support unit 120 includes a tenth roller 122 and a fifth moving unit 124. The tenth roller 122 is in a predetermined position between the fifth roller 30 and the seventh roller 34, and contacts the first recording medium 12 A being conveyed with tension applied therebetween. Specifically, the tenth roller 122 contacts the back surface 14B of the first recording medium 12A at the position described above. The fifth moving unit 124 moves the tenth roller 122 in the separating direction and the approaching direction. The separation direction and the approach direction are the same as described above. That is, the separation direction is a direction in which the vertical direction is directed downward, and the approaching direction is a direction in which the vertical direction is directed upward. The fifth moving unit 124 is configured by an actuator such as an air cylinder, for example. The tenth roller 122 is rotatably attached to the fifth moving unit 124. For example, when the fifth moving unit 124 is an air cylinder, the tenth roller 122 is rotatably attached to the tip portion of the rod of the air cylinder that expands and contracts. The tenth roller 122 is attached to the fifth moving unit 124 and rotates following the direction corresponding to the transport direction in contact with the first recording medium 12A transported in the transport direction by the first transport unit 21. To do.

Suppose that the first separation operation is executed in the inkjet recording apparatus 10 with the detection of the first joint 16A. In this case, the fifth moving unit 124 moves the tenth roller 122 in the separation direction in response to the movement of the first roller 83 and the second roller 86 in the separation direction (see FIG. 7). That is, in the fifth moving unit 124, the rod contracts by an amount corresponding to the extension of each rod of the first moving unit 84 and the second moving unit 87. The extension of each rod of the first moving unit 84 and the second moving unit 87 described above is an extension after the first roller 83 and the second roller 86 are in contact with the first recording medium 12A. The contraction amount of the rod in the fifth moving unit 124 is “gap G6−gap G5”.

Suppose that the first joint 16A has passed through the ejection surface 70 by the first inkjet heads 64Y, 64M, 64C, and 64K. In this case, the fifth moving unit 124 moves the tenth roller 122 in the approaching direction in response to the movement of the first roller 83 and the second roller 86 in the approaching direction. That is, in the fifth moving unit 124, the rod extends by an amount corresponding to the contraction of each rod of the first moving unit 84 and the second moving unit 87. Thus, the first recording medium 12A is conveyed in the conveyance direction in the same state (see FIG. 6) as before the first joint 16A is detected. The contraction of the rods of the first roller 83 and the second roller 86 described above is contraction until the first roller 83 and the second roller 86 are separated from the first recording medium 12A.

In the first separation operation, the control unit 112 performs the following control. That is, the control unit 112 controls the output of the lowering signal to the fifth moving unit 124 at the timing of outputting the lowering signal to the first moving unit 84 and the second moving unit 87. The control unit 112 controls the output of the rising signal to the fifth moving unit 124 at the timing of outputting the rising signal to the first moving unit 84 and the second moving unit 87. The support unit 120 as shown in FIG. 6 is provided for the second recording medium 12B transported by the second transport unit 22 in a state of being spanned between the fifth roller 30 and the seventh roller 34. May be. Also in this case, the support part 120 is provided as shown in FIG. 6 between the fifth roller 30 and the seventh roller 34 of the second transport part 22, for example. When the second separation operation is performed in the inkjet recording apparatus 10, the support unit 120 is configured to expand and contract each rod of the third moving unit 93 and the fourth moving unit 96 as in the case of the first separating operation described above. Works correspondingly. The other description regarding the support part 120 with respect to the second recording medium 12B is omitted.

(4) In the above description, the configuration in which the first separation operation is executed based on the first joint 16A has been described as an example (see FIGS. 2 and 5). In this configuration, the first joint 16A has a gap G5 that is a reference for which the gap between the ejection surface 70 and the first recording medium 12A of the first recording medium 12A transported by the first transport unit 21 is predetermined. This is the portion of the first recording medium 12A that becomes narrower. The configuration in which the second separation operation is executed based on the second joint 16B has been described as an example. In this configuration, the second joint 16B is a second recording medium in which the gap between the ejection surface 70 and the second recording medium 12B is narrower than the gap G5 in the second recording medium 12B transported by the second transport unit 22. 12B portion. The separation operation may be executed even when the gap between the ejection surface 70 and the recording medium 12 becomes narrower than the gap G5 due to a portion of the recording medium 12 different from the joint 16. Examples of the portion of the recording medium 12 that is narrower than the gap G5 include a portion of the recording medium 12 that has been twisted or the like, or foreign matter (dust or the like) that has adhered to the recording surface 14. In addition, when the member forming the recording medium 12 is a cloth, the fluff can be the aforementioned portion.

The first detection unit 100 measures the first recording medium 12A conveyed by the first conveyance unit 21 at the same position and method as described above. The second detection unit 102 measures the second recording medium 12B transported by the second transport unit 22 at the same position and method as described above. The control unit 112 determines whether or not the portion of the first recording medium 12A where the gap G5 is narrowed is detected based on the measurement by the first detection unit 100 or the like. When it is determined that the above-described portion of the first recording medium 12A has been detected, the control unit 112 controls the first separation unit 81 and executes the first separation operation. The control unit 112 determines whether or not the part of the second recording medium 12B where the gap G5 is narrowed is detected based on the measurement by the second detection unit 102 or the like. When it is determined that the above-described portion of the second recording medium 12B has been detected, the control unit 112 controls the second separation unit 90 to execute the second separation operation. Thereby, the same effect as described above can be obtained.

(5) In the above description, the configuration in which the first recording unit 12A is pressed against the seventh roller 34 with a constant force through the ninth roller 38 in the first transport unit 21 has been described as an example (see FIG. 2). In this configuration, the rotation of the third motor 54 is controlled, and accordingly, the vertical position of the ninth roller 38 is controlled. In the second transport unit 22, the configuration in which the second recording medium 12 B is pressed against the seventh roller 34 with a constant force via the ninth roller 38 has been described as an example. In this configuration, the rotation of the third motor 54 is controlled, and accordingly, the vertical position of the ninth roller 38 is controlled. In the first transport unit 21 and the second transport unit 22, the pressing of the recording medium 12 against the seventh roller 34 may be performed in the same manner as in the case of the recording medium 12 against the fifth roller 30, for example. That is, a roller corresponding to the sixth roller 32 may be provided on the upper side of the seventh roller 34 so as to oppose the peripheral side surface of the seventh roller 34, and may be performed via this new roller. This new roller is biased toward the seventh roller 34 (the lower side in the vertical direction). The urged new roller presses the recording medium 12 against the peripheral side surface of the seventh roller 34. Similar to the sixth roller 32, the new roller rotates following the direction corresponding to the transport direction while in contact with the recording surface 14.

In the first transport unit 21, slipping between the first recording medium 12A and the peripheral side surface of the seventh roller 34 is suppressed. Therefore, the first transport unit 21 can accurately transport the first recording medium 12A in the transport direction in a state where tension is applied to the first recording medium 12A. In the second transport unit 22, slip between the second recording medium 12 B and the peripheral side surface of the seventh roller 34 is suppressed. Therefore, the second transport unit 22 can accurately transport the second recording medium 12B in the transport direction in a state where tension is applied to the second recording medium 12B. In the case where the above-described new roller is provided for the seventh roller 34, in the first transport unit 21 and the second transport unit 22, the eighth roller 36, the ninth roller 38, the third rotating shaft 44, the third motor 54, etc. May be omitted.

(6) In the above, when the gap between the ejection surface 70 and the first recording medium 12A is the gap G5, the first roller 83 and the second roller 86 in the first upstream separation portion 82 and the first downstream separation portion 85. In the example described above, the first recording medium 12A is separated from the first recording medium 12A by the gap G7 (see FIG. 2). When the gap between the ejection surface 70 and the first recording medium 12A is the gap G5, the first upstream separating portion 82 and the first downstream separating portion 85 are configured such that the first roller 83 and the second roller 86 are the first recording medium 12A. You may make it be in the state which touched each. It is possible to reduce the amount of expansion / contraction of each rod of the first moving part 84 and the second moving part 87 in the first separation operation by an amount corresponding to the gap G7. Accordingly, the time required for the first separation operation can be shortened. In addition, in the first upstream separation portion 82 and the first downstream separation portion 85, either the first roller 83 or the second roller 86 (for example, the first roller 83) is attached to the first recording medium 12A. The other (for example, the second roller 86) may be in contact with the first recording medium 12A.

When the gap between the ejection surface 70 and the second recording medium 12B is the gap G5, the third roller 92 and the fourth roller 95 are the second recording medium 12B in the second upstream separating part 91 and the second downstream separating part 94. In the above description, the configuration separated by the gap G7 is taken as an example. When the gap between the ejection surface 70 and the second recording medium 12B is the gap G5, the second upstream separation portion 91 and the second downstream separation portion 94 have the third roller 92 and the fourth roller 95 the second recording medium 12B. You may make it be in the state which touched each. The expansion / contraction amount of each rod of the third moving part 93 and the fourth moving part 96 in the second separating operation can be reduced by an amount corresponding to the gap G7. Accordingly, the time required for the second separation operation can be shortened. In addition, in the second upstream side separation portion 91 and the second downstream side separation portion 94, one of the third roller 92 and the fourth roller 95 (for example, the third roller 92) is attached to the second recording medium 12B. The other (for example, the fourth roller 95) may be in contact with the second recording medium 12B.

DESCRIPTION OF SYMBOLS 10 Inkjet recording device 12 Recording medium, 12A 1st recording medium, 12B 2nd recording medium 14 Recording surface, 14A surface, 14B back surface 16 Joint, 16A 1st joint, 16B 2nd joint 20 Conveyance part, 21 1st Conveying unit, 22 Second conveying unit 30 Fifth roller, 32 Sixth roller 34 Seventh roller, 36 Eighth roller, 38 Ninth roller 40 First rotating shaft, 42 Second rotating shaft, 44 Third rotating shaft 50 First One motor, 52 Second motor, 54 Third motor 60

Recording unit

64, 64Y, 64M, 64C, 64K First

ink jet head

66, 66Y, 66M, 66C, 66K Second ink jet head 68 Nozzle, 70 Discharge surface, 72 Carriage 80 separation part 81 first separation part 82 first upstream separation part 83 first roller 84 first movement part 85 first Downstream separation part, 86 Second roller, 87 Second movement part 90 Second separation part 91 Second upstream separation part, 92 Third roller, 93 Third movement part 94 Second downstream separation part, 95 Fourth roller 96 fourth moving unit 100 first detecting unit 102 second detecting unit 110 control device 112 control unit 114 input / output unit 120 support unit 122 tenth roller 124 fifth moving unit G5 G6 G7 Gap H Range, R1, R2, R3, R4 area, WA, WB width

Claims

A transport unit that continuously transports the long recording medium in the transport direction along the longitudinal direction of the recording medium;
A recording unit comprising a line-type inkjet head in which a plurality of nozzles for discharging ink is formed on the recording surface of the recording medium being conveyed by the conveying unit;
In the transport direction, the recording medium transported by the transport unit in the upstream region upstream of the ink jet head and the downstream region downstream of the ink jet head is the plurality of nozzles in the ink jet head. A separation portion that moves in a separation direction in which a gap with the formed ejection surface increases,
An upstream end of a first member that is provided in the upstream region and forms the recording medium located downstream in the transport direction in a transport state in which the recording medium is transported by the transport unit; A detection unit that detects a joint of the recording medium that is connected to the downstream end of the second member that forms the recording medium positioned on the upstream side in the conveyance direction in a conveyance state;
The separation unit is an ink jet recording apparatus that moves the recording medium conveyed by the conveyance unit in the separation direction when the joint is detected by the detection unit.
The spacing portion is
An upstream roller that rotates following the direction corresponding to the transport direction in contact with the recording medium being transported through the upstream region by the transport unit;
An upstream side moving part that moves the upstream side roller in the separating direction;
A downstream roller that rotates following the direction corresponding to the transport direction in contact with the recording medium transported in the downstream area by the transport unit;
The inkjet recording apparatus according to claim 1, further comprising a downstream moving unit that moves the downstream roller in the separation direction.
A support unit that supports the recording medium being transported by the transport unit from a side opposite to the recording surface of the recording medium;
The support part is
A support roller that rotates following a direction corresponding to the transport direction in contact with the recording medium transported by the transport unit on a surface opposite to the recording surface of the recording medium;
Corresponding to the movement of the upstream roller in the separation direction by the upstream movement unit and the movement of the downstream roller in the separation direction by the downstream movement unit, the support roller is moved in the separation direction. The inkjet recording apparatus according to claim 2, further comprising:
The transport unit is
A first transport unit that transports the first recording medium as the recording medium in the transport direction;
A second recording medium as the recording medium, and a second conveying unit that conveys the second recording medium in the conveying direction in a state of being aligned with the first recording medium in the short direction of the first recording medium,
The recording unit is
A line-type first inkjet head in which a first nozzle of the plurality of nozzles for discharging ink is formed on a recording surface of the first recording medium being conveyed by the first conveyance unit;
A line-type second inkjet head in which a second nozzle among the plurality of nozzles for discharging ink is formed on the recording surface of the second recording medium being conveyed by the second conveying unit;
The spacing portion is
A first separation unit that moves the first recording medium conveyed by the first conveyance unit in the upstream region and the downstream region, in the separation direction;
A second separation unit that moves the second recording medium conveyed by the second conveyance unit in the upstream region and the downstream region in the separation direction;
The detector is
A first detection unit that is provided in the upstream region corresponding to the first recording medium conveyed by the first conveyance unit and detects a first joint as the joint in the first recording medium; ,
A second detection unit that is provided in the upstream region corresponding to the second recording medium being conveyed by the second conveyance unit and detects a second joint as the joint in the second recording medium; With
The first separation unit moves the first recording medium conveyed by the first conveyance unit in the separation direction when the first joint is detected by the first detection unit,
The said 2nd separation part moves the said 2nd recording medium conveyed by the said 2nd conveyance part to the said separation direction, when the said 2nd joint is detected by the said 2nd detection part. 2. An ink jet recording apparatus according to 1.
The first spacing portion is
A first roller that rotates following the direction corresponding to the transport direction in contact with the first recording medium transported in the upstream region by the first transport unit;
A first moving part for moving the first roller in the separating direction;
A second roller that rotates following the direction corresponding to the transport direction in contact with the first recording medium transported in the downstream area by the first transport unit;
A second moving part that moves the second roller in the separation direction,
The second spacing portion is
A third roller that rotates following the direction corresponding to the transport direction in contact with the second recording medium transported through the upstream region by the second transport unit;
A third moving part for moving the third roller in the separating direction;
A fourth roller that rotates following the direction corresponding to the transport direction in contact with the second recording medium transported through the downstream region by the second transport unit;
The inkjet recording apparatus according to claim 4, further comprising a fourth moving unit that moves the fourth roller in the separation direction.
A first support part for supporting the first recording medium being transported by the first transport part from a side opposite to the recording surface of the first recording medium;
A second support part for supporting the second recording medium being transported by the second transport part from a side opposite to the recording surface of the second recording medium,
The first support part is
A first rotating member that is driven by a direction corresponding to the conveying direction in contact with the first recording medium conveyed by the first conveying unit on a surface opposite to the recording surface of the first recording medium. A support roller;
Corresponding to the movement of the first roller in the separation direction by the first movement unit and the movement of the second roller in the separation direction by the second movement unit, the first support roller is A first support moving unit that moves in the separating direction,
The second support part is
A second rotating medium driven by a direction corresponding to the conveying direction in contact with the second recording medium conveyed by the second conveying unit on a surface opposite to the recording surface of the second recording medium; A support roller;
In response to the movement of the third roller in the separation direction by the third movement unit and the movement of the fourth roller in the separation direction by the fourth movement unit, the second support roller is The inkjet recording apparatus according to claim 5, further comprising: a second support moving unit that moves in the separation direction.
A transport unit that continuously transports the long recording medium in the transport direction along the longitudinal direction of the recording medium;
A recording unit comprising a line-type inkjet head in which a plurality of nozzles for discharging ink is formed on the recording surface of the recording medium being conveyed by the conveying unit;
In the transport direction, the recording medium transported by the transport unit in the upstream region upstream of the ink jet head and the downstream region downstream of the ink jet head is the plurality of nozzles in the ink jet head. A separation portion that moves in a separation direction in which a gap with the formed ejection surface increases,
A detection unit that is provided in the upstream region and detects a portion of the recording medium in which the gap is narrower than a reference gap that is a predetermined reference in the recording medium that is being conveyed by the conveyance unit;
The separation unit moves the recording medium conveyed by the conveyance unit in the separation direction when the detection unit detects a portion of the recording medium in which the gap is narrower than the reference gap. apparatus.