JP2006182478A - Inkjet printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink jet printer capable of printing on a print paper and shortening time required for printing to increase efficiency in print processing. <P>SOLUTION: A paper rotation unit U6 for rotating the print paper P around a rotary axis X vertical for its print face by 90 degrees is provided in the halfway part of a conveyance passage from a paper set part 3 to a print part 4. The paper rotation unit U6 rotates the print paper P to convey the print paper P to the print part 4 in a condition in which its longitudinal direction crosses the direction of conveyance orthogonally. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention belongs to a technical field related to an ink jet printer in which a print paper set in a paper set unit is pulled out from the paper set unit and conveyed to the print unit, and printing is performed on the print surface of the print paper. .

  In general, an ink jet printer used in a photographic print system or the like includes a paper set unit in which print paper is set, and conveyance for pulling out the print paper set in the paper set unit from the paper set unit and conveying it to the print unit. And road. In this print unit, ink is ejected from the print head to the print paper, printing is performed, and the print paper printed in the print unit is discharged to the outside (see, for example, Patent Document 1).

In addition, when the print paper is cut to a predetermined length on the upstream side of the print unit without being cut continuously, the print paper cut in advance to the predetermined length ( Inkjet printers that carry out printing by conveying so-called cut sheets) to a printing unit are also known.
JP 2003-237156 A

  By the way, in the printing section of such an ink jet printer, the print head for printing on the print paper is fixed with respect to the transport direction of the print paper, and the print head is moved relative to the longitudinal direction of the print paper by transporting the print paper. As a result, printing is performed on the entire print surface of the print paper. For this reason, the longer the amount of print paper conveyed in the printing unit, that is, the longer the length in the print paper conveyance direction, the longer the time required for printing.

  In the printing section of an ink jet printer, print paper is intermittently conveyed in a constant unit conveyance amount (stepwise), and the print head moves in the conveyance direction (sub-scanning direction) at each stop of the print paper during this intermittent conveyance. ) In the main scanning direction orthogonal to (), the ink is ejected at each position in the main scanning direction during this scanning. That is, after one scan of the print head, the print paper is transported by the unit transport amount, and then the print head is scanned once again, and this operation is repeated to print a desired image. For this reason, as the paper length of the print paper (length in the sub-scanning direction) is longer, the number of scans of the print head is increased, and the time required for printing is significantly increased.

  The present invention has been made in view of such a point, and an object thereof is to improve the efficiency of print processing by reducing the time required for printing in an inkjet printer that performs printing on printed paper. It is in.

  In order to achieve the above object, according to the present invention, in the middle of the conveyance path between the paper set unit and the print unit, the print paper is rotated in the longitudinal direction of the print paper by rotating around the rotation axis orthogonal to the print surface. The direction is orthogonal to the conveyance direction, and the printed paper is conveyed to the printing unit in that state.

  An inkjet printer according to the present invention includes a paper set unit on which print paper is set, a print unit that performs printing on the print paper, and conveyance for conveying the print paper set on the paper set unit to the print unit. And an ink jet printer.

  The ink jet printer further includes a paper rotating device that is provided in the middle of the conveyance path and rotates the print paper drawn out from the paper set section by 90 ° about a rotation axis perpendicular to the print surface.

  The transport path is configured to transport the print paper to the printing unit in a state where the longitudinal direction thereof is orthogonal to the transport direction when the paper rotating device rotates the print paper.

  According to this configuration, the paper rotation device is provided in the middle of the conveyance path, and the paper rotation device rotates the print paper by 90 ° around the rotation axis orthogonal to the print surface. As a result, the print paper that has been transported in the state in which the longitudinal direction coincides with the transport direction on the upstream side of the paper rotation device is in a state in which the longitudinal direction is orthogonal to the transport direction on the downstream side of the paper rotation device. In this state, it is conveyed to the printing unit. In other words, since the print paper is transported in a state where the longitudinal direction of the print paper is orthogonal to the transport direction, the paper in the print unit is compared with a case where the print paper is transported in a state where the longitudinal direction of the print paper matches the transport direction. The transport amount (feed amount) is reduced. Thereby, the number of times the print head reciprocates is reduced. As a result, the time required for printing is shortened and the efficiency of the printing process is improved.

  The inkjet printer further includes size specifying means for specifying the size of the print paper, and the paper rotating device rotates the print paper drawn from the paper set unit according to the specification result of the size specifying means. And may be configured to switch between the case of not rotating.

  The paper rotation device switches between rotation and non-rotation of the print paper according to the size of the print paper, so that the paper length (length in the transport direction) is greater than the paper width (length in the direction perpendicular to the transport direction). In the case where the paper length is short or the difference between the paper length and the paper width is small, the print paper can be made non-rotated.

  In other words, only when the paper transport amount (feed amount) in the printing section is significantly reduced by rotating the print paper, the print paper is rotated to shorten the time required for printing, while in other cases, the print time is reduced. By not rotating the paper, the time required to transport the print paper is saved. Accordingly, the print processing efficiency can be further improved by switching between rotation and non-rotation of the print paper according to the size of the print paper.

  The paper set unit is set in a state in which long print paper is wound in a roll shape, and the inkjet printer is provided on the upstream side of the paper rotating device and on the downstream side of the paper set unit, The paper rotation device further includes cutting means for cutting the print paper drawn from the paper set section into a predetermined length, and the paper rotating device is configured to print the paper length (L) of the print paper after being cut by the cutting means and the print. When the ratio (L / W) to the paper width (W) of the paper is larger than a predetermined value, the print paper is rotated, while when the ratio (L / W) is equal to or smaller than the predetermined value, You may comprise so that the said print paper may not be rotated.

  When the paper transport amount (feed amount) is reduced by rotating the print paper as described above by switching between rotation and non-rotation according to the paper length after being cut by the cutting means (L / W) The print paper is rotated only when the print paper is larger than a predetermined value to reduce the time required for printing, while in other cases (when L / W is equal to or smaller than the predetermined value), the print paper is printed. By not rotating the printer, the time required for transporting the print paper is saved.

  As described above, according to the ink jet printer of the present invention, the paper rotating device is provided in the middle of the conveyance path between the paper setting unit and the printing unit, and the paper rotating device rotates the print paper orthogonal to the print surface. By rotating 90 ° around the axis, the print paper can be transported to the print section with the longitudinal direction of the print paper orthogonal to the transport direction, and the paper transport amount (feed amount) in the print section is reduced. This shortens the time required for printing. As a result, it is possible to improve the efficiency of print processing.

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

  FIG. 1 shows an inkjet printer according to an embodiment of the present invention. This ink jet printer is used for a photographic print system, and is connected via a communication cable to a receiving block 100 (see FIG. 9) that acquires image data and order information and performs necessary correction processing and the like. The image data transmitted from the receiving block 100 via the communication cable is printed on the print paper P based on the order information.

  The ink jet printer includes a housing 1, a magazine housing portion 2 disposed in the lower portion of the housing 1, a cassette housing portion 3 disposed in a substantially central portion in the vertical direction in the housing 1, and a housing. A print unit 4 that is disposed in an upper part of the body 1 and prints image data on the print paper P; a first transport path for transporting the print paper P from the magazine housing unit 2 to the print unit 4; A second transport path for transporting the print paper P from the cassette housing unit 3 to the print unit 4 and a second transport path for discharging the print paper P printed by the print unit 4 from the print unit 4 to the outside of the housing 1. 3 and a discharge tray 5 provided outside the housing 1 and receiving the print paper P discharged to the outside of the housing 1 through the third conveyance path. The front-rear direction of the case is the left-right direction in FIG. 1, the front side of the case is the right side of FIG. 1, and the rear side of the case is the left side of FIG. The left-right direction of the housing is a direction perpendicular to the paper surface of FIG.

  A print paper P, which is a long paper wound in a roll shape, is set in the magazine storage portion 2 while being stored and held in the paper magazine 8. The print paper P is wound so that the print surface to be printed is on the outside.

  It is also possible to set two print papers P having a small width dimension in parallel in the left-right direction of the housing in the magazine housing portion 2. The two printed papers P are simultaneously pulled out from the magazine accommodating unit 2 and conveyed in two rows. The printing unit 4 prints the two printed papers P and simultaneously discharges them to the discharge tray.

  The paper magazine 8 is provided with an identification code portion 13a for identifying the type of the printed paper P being set, and the magazine storage portion 2 is provided with the type of the print paper P via the identification code portion 13a. A type detection sensor 13b for detection is provided. In the present embodiment, an identification code portion for identifying the paper width and surface quality (gloss, matte, etc.) is provided as the type of the print paper P, and the type detection sensor 13b uses the paper as the type of the print paper P. The width and the surface quality are detected through the identification code part. Therefore, the identification code part 13a and the type detection sensor 13b function as a size specifying unit that specifies the size of the print paper P.

  The identification code portion 13a includes, for example, a plurality of long holes and a slide member that can slidably cover one side or the other side of each long hole. The position (one side or the other side) of the slide member of the hole is set in advance. On the other hand, the type detection sensor 13b is composed of, for example, a transmission type optical sensor provided for each long hole, and detects the type of the print paper P by detecting the position of the slide member in the full length hole. It has become. Note that the form of the identification code portion 13a and the configuration of the type detection sensor 13b may be any.

  On the other hand, a plurality of print papers P, which are cut sheets, are set in the cassette storage unit 3 while being stored and held in a rectangular box-shaped paper feed cassette 9. The print paper P in the paper feed cassette 9 is stacked in the thickness direction (vertical direction) with the print surface facing upward, and is pressed against a later-described feed roller 35 positioned above by the pressing plate 10. Yes.

  The magazine housing unit 2 and the cassette housing unit 3 constitute a paper set unit in which the print paper P is set. Then, the print paper P set in the magazine housing unit 2 or the cassette housing unit 3 is conveyed to the printing unit 4 as described later, printed by the printing unit 4, and discharged to the discharge tray 5. ing.

  In the housing 1, a first supply unit U1, a cutter unit U2, a second supply unit U3, a switchback unit U4, a print unit U5, and a paper rotation unit U6 are provided to form the first to third transport paths. Is provided. The first transport path is composed of a first supply unit U1, a cutter unit U2, a paper rotation unit U6, a switchback unit U4, and a print unit U5 in order from the magazine accommodating portion 2. Further, the second transport path is configured by a second supply unit U3, a switchback unit U4, and a print unit U5 in order from the cassette housing portion 3. Further, the third transport path is constituted by a print unit U5.

  The first supply unit U1 is provided in the magazine housing portion 2 (paper magazine 8). The first supply unit U1 includes three support rollers 15 that support the roll-shaped print paper P, a guide member 16 that guides the print paper P to the cutter unit U2, and a print member that is provided in the middle of the guide member 16. A pressure supply roller 17 composed of driving and driven rollers 17a and 17b for transporting the paper P to the cutter unit U2, and a guide roller 18 provided on the upstream side of the guide member 16 and around which the print paper P is wound. It has. Of the three support rollers 15, a roller disposed on the front side of the casing is rotationally driven by an electric motor (not shown) to apply a rotational force to the print paper P around the center of the roll. Further, the drive roller 17a of the supply roller 17 is fed by an electric motor 30 disposed in the cutter unit U2 via a transmission belt 31 and a gear train 19 and a later-described feed roller 25 disposed in the cutter unit U2. The drive roller 25a is rotationally driven. A first paper detection sensor 20 is provided at the downstream end of the first supply unit U1. When the print paper P is all pulled out from the magazine accommodating portion 2 by the first paper detection sensor 20, the first paper detection sensor 20 is provided. The rear end of the print paper P is detected. When the rear end of the print paper P is detected, the fact is notified to the operator via a display or the like.

  The cutter unit U2 is disposed on the rear side of the housing of the first supply unit U1, and includes a pressure-feed type feeding roller 25 that feeds the print paper P to the switchback unit U4 via the paper rotation unit U6. A cutter 26, which is disposed downstream of the feed roller 25 and includes a fixed blade 26a and a movable blade 26b for cutting the print paper P, and a driving mechanism for driving the movable blade 26b. A drive unit 27 and a guide member 28 that extends in the horizontal direction and guides the print paper P from the roller 25 to a cutting position by the cutter 26 are provided. The cutter 26 cuts the print paper P drawn from the magazine housing unit 2 to a predetermined length based on the order information from the receiving block 100. The feed roller 25 includes one drive roller 25 a and two driven rollers 25 b that sandwich the print paper P, and these driven rollers 25 b are pressed against the drive roller 25 a by one compression coil spring 29. As described above, the drive roller 25a is rotationally driven by the electric motor 30 through the transmission belt 31 together with the drive roller 17a of the supply roller 17 in the first supply unit U1. The print paper P is moved rearward in the horizontal direction by the feed roller 25 and the guide member 28 and sent to the switchback unit U4 via the paper rotation unit U6. As will be described later, the switchback unit U4. After being received and gripped by the roller pair 41, the cutter 26 cuts it.

  The second supply unit U3 includes a feed roller 35 that comes into contact with the print surface of the print paper P positioned at the top of a plurality of print papers P (cut sheet paper) set in the cassette housing unit 3, and the feed roller 35. And an electric motor 36 that drives the cutting roller 35 through a gear train 37. By driving the feeding roller 35, only one print paper P located at the top moves horizontally in the rearward direction of the housing. Then, it is sent out to the switchback unit U4.

  The switchback unit U4 constitutes a switchback device provided in the middle of the first transport path and the second transport path. The switchback unit U4 is transported from an upstream transport path (that is, the first supply unit U1, the cutter unit U2, the paper rotation unit U6, or the second supply unit U3) located upstream of the switchback unit U4. The print paper P is received and sent to the downstream conveyance path (that is, the print unit U5) located downstream of the switchback unit U4 in the direction opposite to the print paper movement direction at the time of receiving the print paper P. ing. That is, in the upstream conveyance path, the print paper P is conveyed toward the rear side of the housing with the print surface facing upward, and in the downstream conveyance path provided at a position above the upstream conveyance path, The paper P is transported toward the front side of the casing opposite to the upstream transport path with the print surface facing upward. However, in the switchback unit U4, the traveling direction of the print paper P faces the print surface upward. In this state, the print paper P is reversed without being bent so that the print paper P can be smoothly transferred from the upstream transport path to the downstream transport path without bending the print paper P.

  Specifically, the switchback unit U4 includes a gripping member that receives and grips the print paper P transported from the upstream transport path. In the present embodiment, the gripping member is configured as a roller pair 41 that is configured to be rotatable forward and backward about the central axis, and is opposed to each other in the vertical direction, and sandwiches the print paper P therebetween. One (the roller in contact with the back surface of the print paper P in this embodiment) is the driving roller 41a, and the other (the roller in contact with the print surface of the print paper P) is the driven roller 41b. The drive roller 41a is rotationally driven around the central axis by an electric motor 42 and a transmission belt 43 (see FIGS. 2 and 3) as a drive mechanism. By forward rotation and reverse rotation, the printing paper P is received and retracted from the upstream conveying path, and the printing paper P is sent to the downstream conveying path. Note that both rollers of the roller pair 41 may be driven, and the functions of driving and driven may be reversed up and down. 2, 3 and 5, the driven roller 41b is provided so as to be detachable from the driving roller 41a. When the printed paper P is rotated in the paper rotating unit U6, as will be described later. The driven roller 41b is separated from the drive roller 41a.

  The roller pair 41 is linearly moved in the vertical direction by the moving mechanism at the housing rear side position of the paper rotation unit U6, the second supply unit U3, and the print unit U5. As shown in FIGS. 2 and 3, the moving mechanism includes a rail mount 45 that is fixed to the vertical frame 6 and extends in the vertical and horizontal directions, and a vertical position at one end of the rail horizontal direction in the horizontal direction of the casing. A traveling rail 46 attached to extend, and a drive belt 48 that is wound around two pulleys 47 provided near the upper and lower ends of the traveling rail 46 and extends along the traveling rail 46, and a rail mount 45. And an electric motor 49 directly attached to the lower pulley 47. The drive belt 48 is driven forward and reverse by the electric motor 49. A bracket 50 is attached and fixed to the drive belt 48, and a slide member 51 that fits and slides on the travel rail 46 is fixed to the bracket 50, and the drive belt 48 is driven forward and backward by the electric motor 49. As a result, the bracket 50 reciprocates in the vertical direction. The vertical position of the bracket 50 can be determined by measuring the amount of movement (for example, the amount of rotation of the motor) from a reference position (for example, the lowermost end) where a sensor or the like for detecting the bracket 50 is provided. .

  A support plate 52 is fixed to the bracket 50, and one end portions of the driving roller 41 a and the driven roller 41 b in the roller pair 41 are rotatably supported by the support plate 52. Along with the movement, the roller pair 41 moves linearly in the vertical direction. Although not shown, the other end portions of the driving roller 41a and the driven roller 41b are supported by a support portion formed at the other end portion in the left-right direction of the housing of the rail mount 45 so as to be slidable in the vertical direction. .

  The above-described electric motor 42 for driving the drive roller 41a is fixed to the support plate 52. Pulleys 54 are fixed to the rotating shaft of the electric motor 42 and one end of the driving roller 41a. The transmission belt 43 is wound around both pulleys 54, and the driving roller is passed through the transmission belt 43. 41a is driven.

  By the moving mechanism, the roller pair 41 is provided at a receiving position for receiving the print paper P from the upstream transport path, and at a position spaced apart from the receiving position by a predetermined distance and transports the print paper P on the downstream side. It moves linearly between the delivery position and the delivery position. That is, the height position (position near the lower end of the traveling rail 46) substantially the same as the downstream end of the paper rotation unit U6 is a receiving position (hereinafter referred to as a first receiving position) for receiving the print paper P from the cutter unit U2 and the paper rotating unit U6. And a receiving position (hereinafter referred to as a first receiving position) for receiving the print paper P from the second supplying unit U3 is located at substantially the same height as the downstream end of the second supplying unit U3 (substantially the central position in the vertical direction of the traveling rail 46). 2). On the other hand, a height position (position near the upper end of the traveling rail 46) that is substantially the same as the upstream end of the print unit U5 is a sending position for sending the print paper P to the print unit U5. Thus, the downstream end of the upstream conveyance path and the upstream end of the downstream conveyance path are separated by a predetermined distance (a value determined by the arrangement of the units U1 to U6 and set to the smallest possible value). In response to this, the roller pair 41 moves.

  The switchback unit U4 receives the print paper P from the upstream conveyance path (cutter unit U2 and paper rotation unit U6) by the roller pair 41 at the first receiving position and holds the print paper P by the cutter 26. After being cut (as will be described later, when the print paper P is rotated, after the print paper P is cut and the rotation is completed), or at the second receiving position, by the roller pair 41, the upstream conveyance path After receiving and gripping the print paper P from the (second supply unit U3), the roller pair 41 that grips the print paper P is separated from the upstream transport path by the moving mechanism. Move to the delivery position and receive the print paper P at the delivery position. The moving direction of Rintopepa P is configured to deliver the downstream transport path in the opposite direction. The moving direction of the print paper P sent out to the downstream side conveyance path is in the horizontal direction opposite to the moving direction at the time of reception (frontward of the casing).

  As shown in FIG. 2, the support plate 52 has first and second support portions for supporting the print paper P positioned below the print paper P held by the roller pair 41 at the front and rear portions of the case of the roller pair 41. The second support members 56 and 57 are fixed (not shown in FIG. 3). The first support member 56 has a role of guiding the print paper P from the cutter unit U2 to the roller pair 41 in a horizontal state. The first support member 56 is provided with a second paper detection sensor 58 for detecting the print paper P.

  On the other hand, a bent portion bent downward is formed at the rear portion of the housing of the second support member 57, and a pressing roller 59 is in contact with the bent portion. The presser roller 59 is rotatably attached to the tip of the arm 60 that is rotatably supported by the support plate 52, and abuts against the bent portion of the second support member 57 by the weight of the presser roller 59. ing. The bent portion of the second support member 57 and the pressing roller 59 prevent the printed paper P gripped by the roller pair 41 from dropping down and coming into contact with the rear inner wall surface of the housing 1. That is, on the rear side of the switchback unit U4 in the casing 1 (the portion corresponding to the moving range of the roller pair 41 on the opposite side of the upstream conveyance path and the downstream conveyance path with respect to the roller pair 41). Is provided with a space 12 for the print paper P that is gripped by the roller pair 41. By hanging the print paper P downward as described above, the front and rear direction of the space space 12 in the front and rear of the housing is provided. The length along the (upstream direction of the upstream conveyance path) can be made as small as possible. On the other hand, by hanging the print paper P downward, the space 12 for the print paper P gripped by the roller pair 41 is below the portion corresponding to the moving range (below the first receiving position). Although it is necessary to extend, in the present embodiment, with respect to the first transport path, the upstream transport path located on the upstream side of the switchback unit U4 and the first receiving position are set to the print paper P set in the magazine housing portion 2. Therefore, the space 12 can be easily extended downward without increasing the height of the housing 1.

  Although not shown, restriction members for restricting the movement of the print paper P in the width direction are provided at both ends of the first and second support members 56 and 57 in the paper width direction. Both regulating members are configured to be able to change the interval in accordance with the paper width (the width of the paper can be determined by detecting the identification code portion provided in the paper magazine 8). When the print paper P is conveyed in two rows as described above, another regulating member enters the conveyance path at the center between the two regulating members, and is conveyed in two rows by these three regulating members. The movement of each printed paper P in the width direction is restricted.

  The print unit U5 is provided at a fixed base 65 fixed to a horizontal frame 7 extending in the horizontal direction at the upper end position of the vertical frame 6, and is provided at an intermediate portion in the vertical direction of the fixed base 65, and supports the print paper P during printing. A print table 66 and a print head 67 facing the print paper P located on the print table 66 and ejecting ink to the print paper P for printing are provided. The print table 66 and the print head 67 constitute the print unit 4.

  The print table 66 is not configured to suck and hold the print paper P from the lower side of the print table 66 with a fan or the like, and does not have a suction hole or the like as shown in FIG. . At both ends of the print table 66 in the paper width direction (X direction shown in FIG. 4), a plurality of grooves 66a (6 in each embodiment) extending in the paper transport direction (Y direction) are provided in the paper width direction. It is formed to line up at a predetermined interval. Each of the grooves 66a is provided corresponding to both ends in the width direction of the print paper P of various sizes conveyed to the printing unit 4, and the ink ejected from the print head 67 is placed in each groove 66a. Is removed from both ends of the print paper P in the width direction (especially, it is likely to be removed outside when performing borderless printing), an ink absorbing material 68 for absorbing the ink is fitted. A concave portion 66b is formed in the central portion of the print table 66 in the paper width direction, corresponding to each position of three head units 67a described later, and 2 pieces of print paper P are placed in each concave portion 66b. An ink absorbing material 69 that absorbs ink preliminarily ejected (trial strike before printing) from each head unit 67a of the print head 67 when being printed in a row is fitted.

  In the present embodiment, as shown in FIG. 4, the print head 67 has a plurality of ink discharge nozzles 67b on the bottom surface (the surface facing the print table 66) in the sub-scanning direction (paper transport direction (Y direction)). Three head units 67a are provided so as to form a row, and these three head units 67a are arranged at intervals in the sub-scanning direction. Note that only one nozzle row of each head unit 67a is shown in FIG. 4, but actually, a plurality of nozzle rows are arranged in the paper width direction corresponding to each of a plurality of colors of ink. Further, the number of head units 67a is not necessarily three, but may be one or two, or may be four or more.

  The upper surface of the print head 67 is fixedly attached to a drive belt 70 for reciprocating the print head 67 in the main scanning direction (direction perpendicular to the paper surface of FIG. 1 (X direction shown in FIG. 4)). The drive belt 70 extends in the main scanning direction, and is wound around two pulleys 71 (only one is shown in FIG. 1) disposed at both ends thereof and rotatably supported on the upper portion of the fixed base 65. It is hung. The one pulley 71 is rotationally driven by an electric motor (not shown). A guide rail 72 extending in the main scanning direction along the drive belt 70 is attached and fixed to the upper portion of the fixed base 65, and the print head 67 is guided by the guide rail 72 while being driven by the drive belt 70. It reciprocates in the scanning direction. The print paper P on the print table 66 is intermittently (stepwise) conveyed in the sub-scanning direction by a constant unit conveyance amount by a conveyance roller 75 provided on the upstream side of the print table 66, and this intermittent conveyance is performed. At each stop of the print paper P at the time, the print head 67 is scanned one time in the main scanning direction (one-way operation or one-time operation), and the ink of each head unit 67a at each position in the main scanning direction during this scanning. Ink is ejected from the ejection nozzle 67b. That is, after one scan of the print head 67, the print paper P is transported by the unit transport amount, and then the print head 67 is scanned once again, and this operation is repeated to print a desired image. .

  The transport roller 75 is provided at the upstream end of the print unit U5 (that is, the upstream end of the downstream transport path and in the vicinity of the roller pair 41 (see FIG. 6) positioned at the delivery position). The print paper P delivered by the roller pair 41 positioned at the delivery position is received and conveyed to the printing unit 4. Like the feed roller 25 in the cutter unit U2, the transport roller 75 includes one drive roller 75a and two driven rollers 75b that sandwich the print paper P, and the two driven rollers 75b are one compression coil spring. 76 is pressed against the driving roller 75a. The drive roller 75a is rotated by an electric motor 77 via a transmission belt 78.

  The height position of the sandwiched portion of the print paper P sandwiched by the transport roller 75 is higher than the upper surface of the print table 66, and the print paper P is wound around the drive roller 75a while being printed. The portion of the print base 66 that is wound around the drive roller 75a by the guide roller 79 that is supported from the upper end of the print table 66 so as to have a gap above the upstream end. In other words, the print paper P is conveyed in a state where the back surface of the print paper P is substantially in contact with the upper surface of the print table 66.

  On the other hand, on the downstream side of the printing table 66, two pairs of pressure bonding composed of driving and driven rollers 81a and 81b are provided to form a third transport path for discharging the printed paper P to the outside of the housing 1. The mold discharge rollers 81 are provided at intervals in the paper transport direction. The drive roller 81 a of each discharge roller 81 is driven simultaneously by the electric motor 82 via the transmission belt 83. The height of the downstream discharge roller 81 is higher than that of the upstream discharge roller 81, and the print paper P is lifted between the downstream discharge roller 81 and the upstream discharge roller 81 and the downstream side. A guide member 84 that leads to the discharge roller 81 is provided.

  As described above, since the print paper P is lifted to a position higher than the upper surface of the print table 66 on the upstream side and the downstream side of the print table 66, the portion of the print paper P on the print table 66 is the print table 66. It comes to be pressed against the top surface. Thereby, the flatness of the print paper P on the print table 66 is ensured.

  The discharge tray 5 is provided on the front side of the discharge roller 81 outside the casing 1 and protrudes forward of the casing 1, and an auxiliary tray 5a is stored at the front end thereof. . When the length of the printed paper P to be discharged is longer than the length of the discharge tray 5, the auxiliary tray 5a can receive the long printed paper P by pulling it forward of the housing 1. ing.

  As shown in FIGS. 1 and 5, the paper rotation unit U6 includes a holding portion 91 disposed on the back side of the print paper P conveyed from the cutter unit U2 to the switchback unit U4, and a holding portion 91. On the other hand, a fan 92 connected via a connection hose 92a and a driven pulley provided integrally with the holding portion 91 and rotatably provided around the rotation axis X extending in the vertical direction together with the holding portion 91. 94a, a drive pulley 94b attached to the drive shaft of the electric motor 96, a transmission belt 95 wound around the drive pulley 94b and the driven pulley 94a, and a guide member for guiding the print paper P sent out from the cutter unit U2. 98 (not shown in FIG. 5).

  The holding portion 91 is a hollow member, and a plurality of suction holes 91a are formed through the surface (upper surface) that contacts the back surface of the print paper P. Therefore, by driving the fan 92, negative pressure is applied to the print paper P that is in contact with the upper surface of the holding portion 91 via the suction hole 91a, and the print paper P is sucked and held by the holding portion 91. It becomes like this.

  Further, by driving the electric motor 96, the driven pulley 94a rotates through the transmission belt 95, and the holding portion 91 rotates around the rotation axis X along with the rotation.

  Accordingly, in the paper rotation unit U6, the print paper P is rotated about the rotation axis X together with the holding portion 91 by driving the electric motor 96 in a state where the holding portion 91 holds the print paper P by suction. By setting the rotation angle of the print paper P to 90 °, the length direction of the print paper P is changed to the transport direction from the state in which the length direction of the print paper P matches the transport direction (see the solid line in FIG. 5). The state is switched to an orthogonal state (see the alternate long and short dash line in the figure).

  In the present embodiment, the transport rollers 75 of the switchback unit U4 and the print unit U5 are configured to wind the roll on the print paper P after the print paper P transported from the magazine housing unit 2 is cut by the cutter 26. It constitutes a curl correction device that corrects curl caused by wrinkles. In the case of the print paper P conveyed from the cassette housing unit 3, since the curl is not normally curled, the curl correction device does not operate. Further, as will be described in detail later, even when the print paper P is conveyed from the magazine housing unit 2, the curl correction device does not operate when the print paper P is rotated by the paper rotation unit U6.

  Specifically, the transport roller 75 of the print unit U5 has a role as a holding member that holds one end portion of the print paper P sent out by the roller pair 41 of the switchback unit U4 at the sending position. Reference numerals 41 respectively extend along the width direction of the print paper P held by the transport roller 75 and face each other while holding the vicinity of the one end of the print paper P therebetween. That is, when the transport roller 75 receives the print paper P sent out from the switchback unit U4 and clamps the front end portion (rear end portion at the time of receiving), the transport roller 75 temporarily stops its operation and holds the front end portion. It is supposed to be. At this time, the roller pair 41 of the switchback unit U4 holds the vicinity of the front end portion of the print paper P held by the transport roller 75. Then, as shown in FIG. 8, in a state where the print paper P is held by the transport roller 75, the roller pair 41 holding the print paper P is moved in the opposite direction of the roller pair 41 by the moving mechanism of the switchback unit U4. Move to the drive roller 41a side. As a result, the print paper P is wound around the driven roller 41b on the upper side of the roller pair 41 in a state bent to the side opposite to the curl, and a portion between the transport roller 75 and the roller pair 41 of the print paper P A tension is applied to. In other words, the print paper P is curled by the curl caused by the roll so that the central portion in the length direction protrudes toward the print surface with respect to both ends. By wrapping, bend to the opposite side of the curl. For this purpose, the roller pair 41 is moved to the drive roller 41a side (that is, the lower side), which is the roller opposite to the print surface, so that the print paper P is wound around the driven roller 41b. As the roller pair 41 moves, the portion of the print paper P gripped by the roller pair 41 moves from the vicinity of the front end portion to the rear end portion side. As a result, the print paper P is squeezed by the roller pair 41 such that the side protruding from the curl (print surface side) is inside, and the curl is corrected. The conveyance roller 75 is configured to hold the print paper P in a state where the conveyance is stopped during the curl correction of the print paper P.

  Even if the rear end portion of the print paper P is detached from the roller pair 41, the roller pair 41 continues to move downward and returns to the first receiving position in order to receive the next print paper P. That is, the curl of the print paper P is corrected when the roller pair 41 moves from the sending position to the first receiving position. If the length of the print paper P is longer than the distance between the first receiving position and the sending position, the roller pair 41 is moved further downward than the first receiving position to omit the print paper P. The curl is corrected throughout and then returned to the first receiving position. Even when the print paper P is long as described above, the use of the space for hanging the print paper P downward as described above makes it possible to correct the curl over the entire print paper P without enlarging the casing 1 up and down. Can be done.

  As shown in FIG. 9, the inkjet printer has a microprocessor 101 (hereinafter referred to as a CPU), a conveyance control unit 102 connected to the CPU 101 via a data bus, a head control unit 103, and a print control. Unit 104, semiconductor memory RAM / ROM 105, communication interface 106, first paper detection sensor 20, second paper detection sensor 58, and type detection sensor 13 b described above.

  The transport control unit 102 controls the operation of each of the units U1 to U6. The head control unit 103 controls the operation of the print head 67. The communication interface 106 is for transmitting and receiving information to and from the reception block 100. The print control unit 104 controls the print paper P to print image data based on the image data received from the receiving block 100 via the communication interface 106. Here, the order information includes print channel information for specifying the size or the like of the print paper P to be printed and print form information for specifying the number of prints. The paper length of the print paper P is specified based on the order information. Accordingly, the print control unit 104 functions as a size specifying unit.

  Under the control of the conveyance control unit 102, the units U1 to U6 operate as follows.

  When printing is performed on the print paper P set in the magazine housing unit 2, the roller pair 41 of the switchback unit U4 is positioned at the first receiving position (see FIG. 1). Then, by operating the support roller 15 and supply roller 17 of the first supply unit U1 and the feed roller 25 of the cutter unit U2, the print paper P is pulled out of the magazine housing portion 2 and is positioned at the first receiving position. Transport to pair 41.

  The driving roller 41a of the roller pair 41 starts to drive when the tip of the print paper P is detected by the second paper detection sensor 58, and rotates (forward) in the counterclockwise direction in FIGS. The print paper P conveyed from the unit U2 in the horizontal direction to the rear of the housing is received and gripped. That is, the print paper P is sandwiched between the driving roller 41a and the driven roller 41b. The drive roller 41a continues to drive and draws the print paper P into the space space 12 on the rear side of the casing. Then, after the leading edge of the print paper P is detected by the second paper detection sensor 58, after the amount determined based on the order information is conveyed, the movable blade 26b of the cutter 26 is operated to cut the print paper P. The

  At this time, whether the ratio (L / W) is the same as the predetermined value based on the paper width W of the print paper P based on the detection result of the type detection sensor 13b and the paper length L of the print paper P based on the order information. When smaller than that, the print paper P is not rotated by the paper rotation unit U6. Therefore, the drive roller 41 a continues to be driven after the print paper P is cut, and stops when the rear end portion of the cut print paper P is gripped by the roller pair 41. At this stage, the print paper P gripped by the roller pair 41 is not on the upstream conveyance path, but is separated from the upstream conveyance path. The operations of the support roller 15 and the supply roller 17 of the first supply unit U1 and the feed roller 25 of the cutter unit U2 are stopped after the print paper P is cut.

  Subsequently, the drive belt 48 of the switchback unit U4 operates, and the roller pair 41 moves upward and stops at the delivery position (see FIG. 6). As a result, the print paper P is transported from the receiving position to the sending position in a state where the print paper P is cut off from the upstream transport path (the cutter unit U2 and the paper rotating unit U6).

  Thereafter, the drive roller 41a of the roller pair 41 rotates (reverses) in the clockwise direction in FIG. 6, and the cut print paper P is sent to the transport roller 75 of the print unit U5 in the horizontal direction toward the front of the housing.

  When the print paper P is sent out, the front end of the print paper P (rear end at the time of receipt) is detected by the second paper detection sensor 58, and by this detection, the conveyance roller 75 of the print unit U5 starts to operate. When the print paper P is sent by a predetermined amount (the amount until the leading end of the print paper P is nipped by the transport roller 75), the operation of the transport roller 75 is temporarily stopped. As a result, the leading end portion of the print paper P is held and held between the transport rollers 75. Thereafter, in this holding state, as described above, the roller pair 41 holding the print paper P is moved downward to correct the curl of the print paper P (see FIG. 8). At this time, the driving roller 41a of the roller pair 41 may continue to reverse or may be stopped. However, when the drive roller 41a is continuously rotated in the reverse direction, it is necessary to set the rotational speed and the moving speed of the roller pair 41 so that tension is applied to the print paper P. Eventually, the rear end portion of the print paper P is detached from the roller pair 41, but the roller pair 41 continues to move downward and returns to the first receiving position.

  After the roller pair 41 returns to the first receiving position or before returning to the first receiving position and after the rear end portion of the print paper P has passed the position where it deviates from the roller pair 41, the conveying roller 75 is actuated again. Then, the print paper P held at the time of curl correction is conveyed to the print table 66. The print head 67 is moved in the main scanning direction while being intermittently conveyed by the conveyance amount by the conveyance roller 75, and printing on the print table 66 is performed from the ink discharge nozzle 67 b of each head unit 67 a of the print head 67. Printing is performed by ejecting ink to the paper P.

  The printed print paper P is discharged to the outside of the housing 1 with the print surface facing upward by the discharge roller 81 and received by the discharge tray 5.

  On the other hand, when the ratio (L / W) between the paper length and the L paper width W is larger than a predetermined value in the printed paper P after being cut by the cutter unit U2, the printed paper P is removed by the paper rotating unit U6. Rotate. That is, the driving roller 41 a of the roller pair 41 is stopped, the driving of the fan 92 is started, and the cut print paper P gripped by the roller pair 41 is sucked and held by the holding portion 91. Next, the driven roller 41b of the roller pair 41 is moved away from the drive roller, and then the electric motor 96 is driven to rotate the holding portion 91 about the rotation axis X by 90 °. Then, after rotating the print paper P by 90 ° around the rotation axis X, the driven roller 41b is lowered to grip the leading end of the rotated print paper P. After the front end of the print paper P is gripped, the fan 92 is stopped and the drive of the drive roller 41a is resumed. Then, when the rear end portion of the rotated print paper P is gripped by the roller pair 41, the driving roller 41a stops.

  After the roller pair 41 grips the rear end portion of the print paper P, it moves upward and stops at the sending position. As a result, the print paper P is transported from the receiving position to the sending position in a state where the print paper P is cut off from the upstream transport path (the cutter unit U2 and the paper rotating unit U6). Thereafter, the driving roller 41a of the roller pair 41 reverses and sends the print paper P to the transport roller 75 of the print unit U5 in the direction opposite to the moving direction when receiving the print paper P.

  When the print paper P is delivered to the conveyance roller 75, the leading edge of the print paper P is detected by the second paper detection sensor 58, and the conveyance roller 75 of the print unit U5 starts to operate by this detection. Since the print paper P rotated by the paper rotation unit U6 does not need to be curled for the reasons described later, the transport roller 75 continues to operate without stopping and the print fed from the switchback unit U4. The paper P is received and conveyed to the printing stand 66 as it is. The roller pair 41 of the switchback unit U4 moves downward and returns to the first receiving position after the rear end of the print paper P is detected by the second paper detection sensor 58.

  Next, in the same manner as the print paper P drawn out from the magazine housing unit 2, printing is performed by moving the print head 67 in the main scanning direction while intermittently transporting the print paper P by the transport amount by the transport roller 75. . The printed print paper P is discharged by the discharge roller 81 to the outside of the housing 1 with the print surface facing upward, and is received by the discharge tray 5.

  On the other hand, when printing is performed on the print paper P set in the cassette housing portion 3, the roller pair 41 of the switchback unit U4 is positioned at the second receiving position (see FIG. 7). Then, by the operation of the feed roller 35 of the second supply unit U3, the print paper P is pulled out from the cassette housing portion 3 and conveyed to the roller pair 41 located at the second receiving position.

  Subsequently, like the print paper P pulled out from the magazine accommodating portion 2, the roller pair 41 grips the rear end portion of the print paper P, and then moves upward and stops at the sending position. As a result, the print paper P is conveyed from the receiving position to the sending position in a state where the print paper P is cut off from the upstream conveying path (second supply unit U3). Thereafter, the driving roller 41a of the roller pair 41 reverses and sends the print paper P to the transport roller 75 of the print unit U5 in the direction opposite to the moving direction when receiving the print paper P.

  When the print paper P is delivered to the conveyance roller 75, the leading edge of the print paper P is detected by the second paper detection sensor 58, and the conveyance roller 75 of the print unit U5 starts to operate by this detection. In the case of the print paper P set in the cassette housing unit 3, it is not necessary to correct the curl. Therefore, the transport roller 75 continues to operate without stopping, and the print paper P sent out from the switchback unit U4 is removed. Receiving and transporting to the printing stand 66 as it is. The roller pair 41 of the switchback unit U4 moves downward and returns to the second receiving position after the rear end of the print paper P is detected by the second paper detection sensor 58.

  Next, in the same manner as the print paper P drawn out from the magazine housing unit 2, printing is performed by moving the print head 67 in the main scanning direction while intermittently transporting the print paper P by the transport amount by the transport roller 75. . The printed print paper P is discharged by the discharge roller 81 to the outside of the housing 1 with the print surface facing upward, and is received by the discharge tray 5.

  Therefore, in the above-described embodiment, the print paper P is transported to the print unit 4 by rotating the print paper P around the rotation axis X orthogonal to the print surface by the paper rotation unit U6. It is possible to obtain a state that is orthogonal to, that is, the main scanning direction. As a result, the paper conveyance amount (feed amount) in the printing unit 4 is reduced, and the number of times the print head 67 is reciprocated is reduced. As a result, the time required for printing can be shortened and the efficiency of the printing process can be improved.

  Further, the paper rotation unit U6 has a ratio (L / W) between the paper length L and the paper width W of the cut print paper P that is larger than a predetermined value, in other words, the paper length L of the print paper P is smaller. When the paper width W is significantly larger than the paper width W, the print paper P is rotated, while the ratio (L / W) is equal to or smaller than the predetermined value, in other words, the paper length of the print paper P. When the difference between L and the paper width W is small, or the paper length L is shorter than the paper width W, the print paper P is not rotated.

  That is, when the difference between the paper length L and the paper width W of the print paper P is small, even if the print paper P is rotated, the transport amount of the print paper P in the print unit 4 does not change much, and the paper length L Is shorter than the paper width W, by rotating the print paper P, the transport amount of the print paper P in the print unit 4 is conversely increased. Therefore, in such a case, by not rotating the print paper P, the time for transporting the print paper P can be saved accordingly.

  On the other hand, when the paper length L of the print paper P is significantly larger than the paper width W, rotating the print paper P significantly reduces the transport amount of the print paper P in the print unit 4 and enables printing. The time required is greatly saved. Therefore, by switching between rotation and non-rotation according to the size of the print paper P, the efficiency of the print processing can be further improved.

  Furthermore, by rotating the print paper P by the paper rotation unit U6, high flatness can be ensured in the print unit 4 without performing curl correction of the print paper P. That is, the printing unit 4 is configured to lift and support the print paper P at a position higher than the upper surface of the print table 66 on the upstream side and the downstream side of the print table 66. In this configuration, the position on the print table 66 is Since the force in the direction of pressing the print paper P against the print table 66 is applied to the position deviated from the print paper P, the applied force is transmitted along the print paper P in the transport direction, and It acts on the portion of the print paper P located at. At that time, when the print paper P is curled in the transport direction, the force applied to the print paper P is not reliably transmitted to the upper portion of the print table 66, and as a result, The flatness of the print paper P may be deteriorated.

  In contrast, when the print paper P is curled in a direction perpendicular to the transport direction, the curl direction is perpendicular to the direction of the force applied to the print paper P. The force is surely transmitted to the print paper P, and the portion of the print paper P on the print table 66 is surely pressed against the print table 66, and high flatness is obtained.

  Accordingly, the paper rotation unit U6 rotates the print paper P so that the longitudinal direction of the print paper P not only coincides with the main scanning direction but also the print paper P curled by the curl of the roll. The direction has a function of matching with the main scanning direction, and as a result, high flatness of the print paper P is ensured.

  In the above-described embodiment, the curl is corrected by the switchback unit U4 for the print paper P from the magazine accommodating portion 2 that is not rotated by the paper rotation unit U6. The flatness of the print paper P in the print unit 4 can be ensured and the print quality can be maintained at a high level.

  In the above embodiment, the paper rotation unit U6 is configured to rotate in a state where the print paper P is sucked and held, but the configuration of the paper rotation unit U6 is not limited to this. For example, as shown in FIG. 10, the print paper P may be rotated while being sandwiched in the thickness direction. That is, the paper rotation unit U6 includes a first clamping member 93 disposed on the back side of the print paper P, and a first clamping member 93 disposed on the front side of the print paper P so as to face the first clamping member 93. Two driven members 94a, a driven pulley 94a which is provided integrally with the first holding member 93 and is rotatable around a rotation axis X extending in the vertical direction together with the first holding member 93, and an electric motor A driving pulley 94b attached to 96 driving shafts, and a transmission belt 95 wound around the driving pulley 94b and the driven pulley 94a are provided.

  The second clamping member 97 is provided so as to be detachable from the first clamping member 93 by, for example, a solenoid. When the second clamping member 97 is in contact with the first clamping member 93, The print paper P is held in the thickness direction by the first and second holding members, and when the second holding member 97 is separated from the first holding member 93, the print paper P is not held. Further, in a state in which the print paper P is clamped together with the first clamp member 93, the second clamp member 97 is rotated about the rotation axis X as the print paper P is rotated by the rotation of the first clamp member 93. It has become.

  Then, by driving the electric motor 96 in a state where the print paper P is held by the first and second holding members 93 and 97, the print paper P is rotated along with the first and second holding members 93 and 97. As a result, the print paper P is rotated 90 ° around the X direction, so that the length direction of the print paper P coincides with the transport direction (see the solid line in FIG. 10) and the length direction thereof is orthogonal to the transport direction (same as above). It can be switched to the one-dot chain line in the figure).

  In the above embodiment, the paper rotation unit U6 is arranged between the cutter unit U2 and the switchback unit U4. However, the arrangement of the paper rotation unit U6 is not limited to this, and the upstream side of the print unit U5 and the cutter. What is necessary is just to be the downstream of unit U2. In that case, a member for gripping the print paper P (in the above embodiment, the roller pair 41 of the switchback unit U4) may be provided as appropriate.

  Furthermore, in the above-described embodiment, the paper rotation unit U6 is provided only in the upstream conveyance path on the magazine housing unit 2 side. However, the paper rotation unit U6 may be provided in the upstream conveyance path on the cassette housing unit 3 side. .

  Furthermore, in the above embodiment, both the magazine housing portion 2 and the cassette housing portion 3 are provided. However, only one of the magazine housing portion 2 and the cassette housing portion 3 may be provided. A plurality of sections 2 or cassette housing sections 3 may be provided.

  In the above embodiment, the print paper P is rotated by 90 ° upstream from the print unit 4 in order to reduce the transport amount of the print paper P in the print unit 4. Reducing the carry amount can also be realized with the following configuration.

  That is, a first transport path and a second transport path are provided as transport paths for transporting the print paper P drawn from the magazine housing section 2 (paper set section) to the print section 4. Among these, the first transport path is configured such that the direction in which the print paper P is pulled out and transported from the magazine accommodating unit 2 and the transport direction in which the print paper P is transported (supplied) to the print unit 4 are orthogonal to each other. In the second transport path, the direction in which the print paper P is pulled out and transported from the magazine housing unit 2 and the transport direction in which the print paper P is transported to the print unit 4 coincide (by the switchback unit U4 as in the above embodiment). (Including the case where the directions in which the print paper P is conveyed are opposite to each other).

  As a result, the print paper P conveyed to the printing unit 4 by the first conveyance path is conveyed to the printing unit 4 with its longitudinal direction orthogonal to the conveyance direction, and is printed by the second conveyance path. The print paper P transported to the section 4 is transported to the print section 4 with its longitudinal direction coinciding with the transport direction.

  Then, according to the ratio (L / W) between the length (L) and the width (W) of the print paper P, when the ratio is larger than a predetermined value, the print paper P is moved by the first transport path. When the ratio is equal to or smaller than the predetermined value, the print paper P is conveyed to the print unit 4 through the second conveyance path. That is, the conveyance path is switched. By doing so, as in the above embodiment, the amount of paper transport in the print unit 4 is reduced, the number of times the print head 67 reciprocates is reduced, the time required for printing is shortened, and the efficiency of the printing process is increased. Can be achieved.

  In addition, in the above embodiment, the ink jet printer of the present invention is applied to an ink jet printer used in a photographic print system. However, if the ink jet printer is configured to transport the print paper P from the paper set portion to the print portion 4. The present invention can be applied to anything.

  INDUSTRIAL APPLICABILITY The present invention is useful for an ink jet printer in which print paper set in a paper set portion is pulled out from the paper set portion and conveyed to the print portion, and is particularly useful for an ink jet printer used in a photographic print system.

It is the schematic seen from the housing | casing side which shows the structure of the inkjet printer which concerns on embodiment of this invention. It is the figure seen from the housing | casing side which shows the structure of a switchback unit. It is the figure seen from the housing | casing which shows the principal part of a switchback unit. It is a top view which shows a printing stand. It is a perspective view which shows the principal part of a paper rotation unit. FIG. 2 is a view corresponding to FIG. 1 illustrating a state when a roller pair of the switchback unit is located at a delivery position. FIG. 3 is a view corresponding to FIG. 1 showing a state when a roller pair of the switchback unit is located at a second receiving position. FIG. 2 is a view corresponding to FIG. 1 showing a state in which curling of the printed paper is corrected. It is a block diagram which shows the structure of a control system. FIG. 6 is a view corresponding to FIG. 5 showing a modification of the paper rotation unit.

Explanation of symbols

P Print paper U6 Paper rotation unit (paper rotation device)
2 Magazine storage (paper set)
26 Cutter (cutting means)
4 Print section 13a Identification code section (size specifying means)
13b Type detection sensor (size identification means)
104 Print control unit (size specifying means)

Claims (3)

An ink jet comprising: a paper set unit on which print paper is set; a print unit that performs printing on the print paper; and a conveyance path for conveying the print paper set on the paper set unit to the print unit A printer,
A paper rotation device that is provided in the middle of the conveyance path and rotates the print paper drawn from the paper set unit by 90 ° around a rotation axis perpendicular to the print surface;
The conveyance path is configured to convey the print paper to the printing unit in a state where the longitudinal direction thereof is orthogonal to the conveyance direction when the paper rotation device rotates the print paper. Inkjet printer. The inkjet printer according to claim 1.
A size specifying means for specifying the size of the print paper;
The paper rotation device is configured to switch between a case where the print paper drawn from the paper set unit is rotated and a case where the paper paper is not rotated according to the specification result of the size specifying means. . The inkjet printer according to claim 1 or 2,
In the paper set section, a long print paper is set in a state wound in a roll shape,
A cutting means provided on the upstream side of the paper rotation device and on the downstream side of the paper set unit, and cutting the print paper drawn from the paper set unit into a predetermined length;
When the ratio (L / W) between the paper length (L) of the printed paper after being cut by the cutting means and the paper width (W) of the printed paper is larger than a predetermined value, An inkjet printer configured to rotate the print paper while the print paper is not rotated when the ratio (L / W) is equal to or smaller than the predetermined value.

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