JP2006176270A - Printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve processing ability of a printer by shortening the time to be required to correct curl in the case of correcting curl after cutting a printing paper P at the predetermined length, in regard to a printer using a printing paper P curled by forming into a roll. <P>SOLUTION: The printer is provided with a cutter 26 for cutting the printing paper P, which is drawn from a paper set part, at the predetermined length, and a curl correcting device provided upstream of a printing unit 4 and downstream of the cutter 26 to correct curl of the printing paper P after cutting. The curl correcting device changes quantity of correction of the curl in relation to one end or both ends of the printing paper P after cutting and quantity of correction of the curl in relation to at least an intermediate part of the printing paper P in the longitudinal direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention pulls out a long print paper set in a roll form around a paper set unit from the paper set unit and conveys it to the print unit, and the print unit prints on the print surface of the print paper. Belongs to the technical field related to printers.

  In general, a printer used in a photographic printing system or the like includes a paper set unit on which print paper is set, and a conveyance path 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. In this print unit, printing is performed by discharging ink from the print head to the print paper, and the print paper printed by the print unit is discharged to the outside.

  In the printer as described above, long paper wound in a roll shape is used, and the print paper is set in the paper set portion in a state wound in a roll shape. For this reason, the printed paper conveyed to the printing unit is curled by the curl of the roll.

  However, when the print paper is curled as described above, the flatness of the print paper in the print section is deteriorated, which is a factor that adversely affects the print quality particularly in an ink jet printer. For this reason, conventionally, the flatness of the print paper is ensured by sucking the print paper to the print table by the suction device in the printing unit (see, for example, Patent Document 1).

On the other hand, it is also known to correct the curl by bending the print paper to the opposite side of the curl in the middle of the conveyance path to the print unit (for example, see Patent Document 2). If the curl is corrected on the upstream side of the print unit, the flatness can be secured with a simple and small suction device, or the possibility that the planarity can be secured even if the suction device is eliminated is increased.
Japanese Patent Laid-Open No. 2003-260827 Japanese Patent Laid-Open No. 10-86411

  However, since the conventional curl correction method simply bends the print paper to the opposite side of the curl by one roller, the curl correction amount for the print paper is always constant in the length direction.

  On the other hand, for example, when the curling correction is performed after cutting the print paper into a predetermined length from the viewpoint of the arrangement of the cutting means for cutting the print paper or the curl correcting device, the length of the print paper If the curl correction is performed with a certain amount of curl correction in the direction, the time required for the curl correction becomes longer, resulting in a disadvantage that the processing capacity of the printer is reduced accordingly.

  The present invention has been made in view of such a point, and an object of the present invention is to use a curl after cutting the print paper to a predetermined length in the printer using the print paper curled by the curl as described above. The purpose of the correction is to improve the processing capability of the printer by reducing the time required for the curl correction process.

  In order to achieve the above object, according to the present invention, the correction amount of curl correction for one or both ends of the printed paper after being cut to a predetermined length, and the curl for at least the intermediate portion in the longitudinal direction of the printed paper. The amount of correction was corrected, which shortened the time required for curl correction.

  The printer of the present invention includes a paper set unit that is set in a state in which a long print paper is wound in a roll shape, a print unit that performs printing on the print paper, and a print that is set in the paper set unit. And a conveyance path for conveying the paper to the printing unit.

  This printer is provided in the middle of the conveyance path, and is provided with a cutting means for cutting the print paper drawn from the paper set section into a predetermined length, and upstream of the printing section and downstream of the cutting means. And a curl correcting device that corrects curl due to curling of the roll in the printed paper after being cut by the cutting means.

  The curl correction apparatus changes the correction amount of curl correction for one or both ends of the cut print paper and the correction amount of curl correction for at least the middle portion in the longitudinal direction of the print paper. Configure.

  With the above configuration, the curl correction amount at one end or both ends of the printed paper after cutting and the curl correction amount at the intermediate portion in the length direction are made different from each other, so that the curl correction suitable for each of the end portion and the intermediate portion is achieved. The amount corrects curl over the entire length of the printed paper. In other words, the curl correction amount is increased for parts that require sufficient curl correction on the printed paper, and the curl correction amount is reduced for parts that do not require sufficient curl correction. To save time. As a result, the time required to correct the curl over the entire print paper is shortened, and the processing capacity of the printer is improved.

  The curl correcting device includes a holding member that holds one end of the cut print paper, and extends along the width direction of the print paper held by the holding member, and is opposed to each other between the print paper. A pair of rollers gripping the vicinity of the one end of the paper and a pair of rollers gripping the print paper while being held by the holding member. The print paper is bent to one roller of the pair of rollers in a direction opposite to the curl. And a moving mechanism that moves the roller pair to the other roller side in the opposing direction of the roller pair so that tension is applied to the print paper. Along with this, the part of the print paper gripped by the pair of rollers is moved from the vicinity of the one end to the other end side so that the print paper is moved. The very fact, configured to correct the curl of the print paper, further the curl correction device, by changing the squeezing operation of the print paper, may be configured to change the curl correction amount.

  When the roller pair of the curl correction device moves to the side opposite to the side where the print paper protrudes due to curling, the print paper moves to the roller on the opposite side of the roller pair from the side on which it moves and to the side opposite to the curl side. While being wound in a bent state, tension is applied to the print paper between the holding member and the roller pair, and as the roller pair moves, the portion of the print paper gripped by the roller pair starts from the vicinity of one end. Move to the other end side. As a result, the print paper is squeezed in a state bent to the side opposite to the curl by the roller pair, thereby correcting the curl. In this way, not only the print paper is bent, but also tension is applied while gripping by the roller pair.

  The curl correction device is configured to change the curl correction amount by changing the ironing operation of the print paper, and the portion gripped by the roller pair in the print paper is at one end and / or the other end. The ironing operation is changed depending on whether or not it is an intermediate part. Accordingly, it is possible to change the correction amount of curl correction for one or both ends of the print paper and the correction amount of curl correction for at least the middle portion in the longitudinal direction of the print paper.

  The change of the ironing operation is specifically a change of the moving speed of the roller pair. That is, as the moving speed of the roller pair is slower, the print paper is slowly squeezed and the curl correction amount is increased. As the moving speed of the roller pair is faster, the print paper is quickly squeezed and the curl correction amount is reduced.

  Further, at least one roller of the roller pair may be rotated around the central axis during curl correction, and the rotation speed may be changed as a change in the ironing operation. In other words, when the roller is rotated in the direction in which the print paper is sent out (the direction in which the roller is driven to rotate by the movement of the roller pair), the rotation speed and the moving speed of the roller pair are applied to the print paper in tension. However, the slower the roller rotation speed, the stronger the tension applied to the print paper and the greater the amount of curl correction. The faster the roller rotation speed, the higher the tension applied to the print paper. Becomes weaker and the amount of curl correction becomes smaller. On the other hand, when rotating the roller in the opposite direction, the higher the rotational speed of the roller, the stronger the tension applied to the print paper, the greater the amount of curl correction, and the slower the rotational speed of the roller, The tension applied to the print paper is weakened and the curl correction amount is reduced.

  The printing unit conveys the print paper in an oblique direction from the upstream side of the print table supporting the print paper during printing toward the print table, and in an oblique direction from the print table to the downstream side of the print table. By discharging the print paper, the print paper on the print table is configured to be pressed against the print table, and the curl correction device increases the amount of curl correction with respect to one or both ends of the print paper. You may comprise so that the curl correction amount at least with respect to a center part may be made small.

  When the print unit is configured to convey and eject the print paper in an oblique direction with respect to the print table and press the print paper on the print table against the print table, the middle part of the print paper is positioned on the print table. In this case, the print paper is lifted and supported by the print table on each of the upstream side and the downstream side of the print table. As a result, the flatness of the intermediate portion of the printed paper can be sufficiently ensured even if it is curled.

  On the other hand, when the end portion of the print paper is positioned on the print table, the print paper is not supported on either the upstream side or the downstream side of the print table. For this reason, the end of the print paper may not be able to ensure sufficient flatness when curled.

  Therefore, by increasing the amount of curl correction to one or both ends of the print paper, the end of the print paper is positioned on the print table, and printing is performed on either the upstream side or the downstream side of the print table. Even when the paper is not supported, the flatness during printing is sufficiently ensured. On the other hand, by reducing the amount of curl correction at least for the central portion, the time required for curl correction is shortened. That is, the curl correction processing time is shortened while sufficiently ensuring flatness during printing over the entire length of the print paper.

  As described above, according to the printer of the present invention, the curling correction amount at one end or both ends of the printed paper after cutting and the curling correction amount at the intermediate portion in the length direction are made different from each other. With the curl correction amount suitable for each intermediate portion, the curl is corrected in the entire length direction of the print paper, and the time required for the curl correction is shortened, so that the processing capability of the printer can be improved.

  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 in a photographic printing system, and is connected via a communication cable to a receiving block 100 (see FIG. 8) 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. Thus, the magazine housing unit 2 constitutes a paper set unit in which a long print paper is set in a state of being wound in a roll shape with the print surface outside. 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. 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 magazine housing 2, it is also possible to set two print papers P having a small width in parallel in the left-right direction of the housing, and when two are set in parallel in this way, The set two print papers P are simultaneously pulled out from the magazine housing unit 2 and conveyed in two rows. The print unit 4 prints the two print papers P and discharges them simultaneously to the discharge tray.

  In the casing 1, a first supply unit U1, a cutter unit U2, a second supply unit U3, a switchback unit U4, and a print unit U5 are provided to constitute the first to third transport paths. The first transport path is composed of a first supply unit U1, a cutter unit U2, 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 in a state of being fixed to the vertical frame 6 extending in the vertical direction, and is a crimp-type delivery unit that sends out the print paper P to the switchback unit U4. A cutting roller 25, a cutter 26 that is disposed downstream of the feeding roller 25 and that cuts the print paper P and includes a fixed blade 26 a and a movable blade 26 b, a drive mechanism that drives the movable blade 26 b, and the like And a guide member 28 that extends in the horizontal direction and feeds the print paper P from the roller 25 to a cutting position by the cutter 26. 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, and is received by the roller pair 41 of the switchback unit U4 as will be described later. After being gripped, it is cut by the cutter 26. The roller pair 41 may receive the print paper P after cutting instead of receiving the print paper P before cutting. However, in this case, since the conveyance path in the cutter unit U2 becomes long, it is preferable to receive it before cutting.

  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 paper transport device and switchback device provided in the middle of the first transport path and the second transport path. The switchback unit U4 receives the print paper P conveyed from the upstream conveyance path (that is, the first supply unit U1 and the cutter unit U2 or the second supply unit U3) located on the upstream side of the switchback unit U4. Upon receipt, the print paper P is sent out 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 moving direction at the time of receipt. 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 roller pair 41 that receives and grips the print paper P that has been transported from the upstream transport path. In this embodiment, the roller pair 41 is configured to be rotatable forward and backward around the central axis, and is opposed to each other in the vertical direction so as to sandwich the print paper P therebetween. One of them (the roller that contacts the back surface of the print paper P) is the drive roller 41a, and the other (the roller that contacts 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 following may be reversed.

  The roller pair 41 is linearly moved in the vertical direction by the moving mechanism at the housing rear side position of the cutter unit U2, 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 side conveyance path, and at a position spaced apart by a predetermined distance from the reception position, and the print paper P is conveyed on the downstream side. It moves linearly between the delivery position and the delivery position. That is, a position substantially the same as the downstream end of the cutter unit U2 (a position near the lower end of the traveling rail 46) is a receiving position for receiving the print paper P from the cutter unit U2 (hereinafter referred to as a first receiving position). A receiving position (hereinafter referred to as a second receiving position) for receiving the print paper P from the second supplying unit U3 is a height position that is substantially the same as the downstream end of the second supplying unit U3 (a substantially central position in the vertical direction of the traveling rail 46). Has been. 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 U5 and set to the smallest possible value). In response to this, the roller pair 41 moves. The roller pair 41 can be moved further downward from the first receiving position by a moving mechanism.

  The switchback unit U4 receives the print paper P from the upstream conveyance path (cutter unit U2) by the roller pair 41 at the first receiving position, and after the print paper P is cut by the cutter 26, Alternatively, after receiving and gripping the print paper P from the upstream conveyance path (second supply unit U3) by the roller pair 41 at the second receiving position, the roller pair 41 that grips the print paper P by the moving mechanism is The print paper P is moved to the sending position while being separated from the upstream conveyance path, and the print paper P is moved to the downstream conveyance path in the direction opposite to the moving direction of the print paper P when receiving the print paper P at the sending position. It is configured to send out. 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 casing 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 positions in the width direction of the print paper P having various sizes. In each groove 66a, the ink ejected from the print head 67 is arranged in the width direction of the print paper P. An ink absorbing material 68 for absorbing the ink is fitted when it comes off from both ends (especially, it easily comes off when performing borderless printing). 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. 5) 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 a result, the print paper P is discharged in an oblique direction from the print table 66 to the downstream side.

  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. In particular, the print paper P conveyed from the magazine housing unit 2 is curled so that the central portion in the length direction protrudes toward the print surface side with respect to both ends by the rolls of the roll. Even if the print paper P is curled, the flatness can be secured without being attracted to the print table 66. In the present embodiment, as will be described later, the print paper P conveyed from the magazine accommodating portion 2 is corrected for the curl before being supplied to the print table 66, so that the flatness is further improved. Can do.

  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.

  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.

  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. 7, 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.

  According to the configuration of the curl correction apparatus, the curl correction amount of the print paper P can be adjusted by changing the moving speed of the roller pair 41 downward by the moving mechanism. That is, the slower the moving speed of the roller pair 41, the slower the print paper P is, and the greater the amount of curl correction.

  Alternatively, by changing the winding length of the print paper P around the roller (here, the driven roller 41b) around which the print paper P is wound when the roller pair 41 is moved by the moving mechanism, The curl correction amount of the print paper P may be adjusted. In other words, the curl correction amount increases as the winding length around the driven roller 41b increases. In order to change the wrapping length around the driven roller 41b in this way, for example, a roller is provided that presses the portion of the back side of the printed paper P closer to the driven roller 41b than the drive roller 41a, The winding length can be changed by changing the pressing amount.

  Alternatively, the curl correction amount of the print paper P may be adjusted by changing the diameter of the roller (driven roller 41b) around which the print paper P is wound in the roller pair 41. That is, the smaller the diameter of the driven roller 41b, the larger the curl correction amount. In order to change the diameter of the roller in this way, for example, a plurality of portions having different diameters in the length direction of the roller are provided in a plurality of stages, and the roller is moved in the length direction corresponding to the portion contacting the print paper P. The roller diameter can be changed by moving it.

  Alternatively, during the downward movement of the roller pair 41 (that is, during curl correction of the print paper P), the driving roller 41a of the roller pair 41 is driven, and the rotation speed of the driving roller 41a at this time is changed, thereby printing. The curl correction amount of the paper P may be adjusted. That is, when the drive roller 41a is rotated in the reverse direction (rotated in the same direction as when the print paper P is sent out at the sending position), the rotation speed and the moving speed of the roller pair 41 are applied to the print paper P with tension. However, the lower the rotational speed of the drive roller 41a, the stronger the tension applied to the print paper P and the greater the amount of curl correction. On the other hand, when the drive roller 41a is rotated forward (rotates in the same direction as when the print paper P is received and pulled into the space 12 at the first receiving position), the faster the drive roller 41a rotates, the higher the print paper P The tension applied to the sheet increases and the amount of curl correction increases. If the roller around which the print paper P is wound is driven in the roller pair 41, the curl correction amount of the print paper P can be more reliably adjusted by changing the rotation speed of the roller.

  The curl correction device will be described in detail later, but the change in the moving speed of the roller pair 41, the change in the rotation speed of the driving roller 41a, the change in the winding length of the print paper P, and the diameter of the driven roller 41b are described later. One of the changes is adopted, and the amount of curl correction is changed with respect to the length direction of the print paper P. Note that the curl correction amount may be changed with respect to the length direction of the print paper P by combining any two or any three of these four methods or by combining all four. .

  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. When 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 move the print paper P. The curl is corrected to the rear end, and then returned to the first receiving position. Thus, even when the print paper P is long, the curl correction can be performed up to the rear end portion of the print paper P without using the space for hanging the print paper P downward as described above without enlarging the casing 1 up and down. Can be done.

  As shown in FIG. 8, 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, and first paper detection sensor 20 and second paper detection sensor 58 described above.

  The conveyance control unit 102 controls the operation of each of the units U1 to U5. 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.

  Under the control of the conveyance control unit 102, the units U1 to U5 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 After this cutting, the driving roller 41a continues to drive, 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. 5). As a result, the print paper P is conveyed from the receiving position to the sending position in a state where it is separated from the upstream conveying path (cutter unit U2).

  Thereafter, the drive roller 41a of the roller pair 41 rotates (reverses) in the clockwise direction in FIG. 5, 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 casing.

  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. 7). At this time, as the roller pair 41 moves downward, the moving speed of the roller pair 41 is changed, the rotational speed of the driving roller 41a is changed, the winding length of the print paper P is changed, or the diameter of the driven roller 41b. By changing the above, the curl correction amount for the print paper P is changed in its length direction. Specifically, the curl correction amount is increased for the front and rear end portions of the print paper P, and the curl correction amount is decreased for the intermediate portion of 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.

  In this way, the printed paper P drawn out from the magazine accommodating unit 2 is sequentially cut by the cutter 26, and the cut printed paper P is sequentially conveyed to the printing unit 4 and printed by the printing unit 4 in order. It is discharged to the outside of the body 1 and stacked on 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. 6). 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 2 and conveyed to the roller pair 41 located at the second receiving position.

  Subsequently, when the roller pair 41 receives the print paper P and grips the rear end portion of the print paper P, the forward rotation of the drive roller 41a is stopped, and then the roller pair 41 moves upward to the sending position. Stop. 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 transport roller 75, the leading end of the print paper P is detected by the second paper detection sensor 58, and the transport roller 75 of the print unit U5 starts operating 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 curl correction device is disposed in the middle of the first transport path for transporting the print paper P from the magazine housing unit 2 to the print unit 4, and this curl correction device is used for the cut print paper. The amount of curl correction for the front and rear end portions of P is increased, and the amount of curl correction for the intermediate portion in the length direction is decreased.

  For example, when the curl correction amount is changed by changing the moving speed of the roller pair 41, the moving speed of the roller pair 41 is increased when correcting the curl of the intermediate portion of the print paper P. As a result, the processing time is reduced as compared with the case where the curl correction is performed with a constant curl correction amount (that is, with a constant moving speed) over the entire length of the print paper P.

  When the curl correction amount is changed by changing the rotation speed of the driving roller 41a, changing the winding length of the print paper P, or changing the diameter of the driven roller 41b, the moving speed of the roller pair 41 is relatively high. When the curling of the front end portion and the rear end portion of the print paper P is corrected, the rotational speed of the driving roller 41a, the winding length of the print paper P, or the diameter of the driven roller 41b is corrected. Increase the amount of curl correction by changing. That is, in order to change the curl correction amount other than by adjusting the moving speed of the roller pair 41, it is possible to set the moving speed of the roller pair 41 to a high speed in advance, thereby reducing the processing time. Shortening is achieved.

  Thus, the processing time required for curl correction is shortened, so that the processing capability of the printer can be improved. This is particularly effective when the paper length of the printed paper P after cutting is relatively long.

  Even if the curl correction amount at the intermediate portion of the print paper P is reduced, the print unit U5 conveys and discharges the print paper P in an oblique direction with respect to the print table 66. The upper part is pressed against the upper surface of the print table 66. Therefore, the flatness of the print paper P on the print table 66 can be sufficiently ensured.

  On the other hand, in the configuration of the print unit U5, when the front end portion or the rear end portion of the print paper P is positioned on the print table 66, the print paper P is discharged from the discharge roller 81 or the downstream side of the print table 66. Although the print paper P is not supported by the transport roller 75 and is difficult to be pressed against the upper surface of the print table 66, the curl at the front end and the rear end of the print paper P is sufficiently increased by increasing the curl correction amount. Therefore, even when the front end portion and the rear end portion of the print paper P are located on the print table 66, the flatness of the print paper P can be sufficiently secured.

  In the above embodiment, the curl correction amount is changed in the length direction of the print paper P by changing the ironing operation of the print paper P by the curl correction apparatus. It is not limited to.

  For example, the curl correction apparatus includes a first curl correction unit that performs curl correction on the front end portion of the print paper, and a second curl correction that is performed on the middle portion and the other end portion in the length direction of the print paper P. The curl correction amount with respect to the front end portion of the print paper P and the curl correction amount with respect to the intermediate portion in the longitudinal direction and the other end portion of the print paper P may be changed. As shown in FIG. 9, the first curl correction unit includes a guide roller 32 and a switchback unit U4 provided near the upstream conveyance path side (front side of the housing) of the roller pair 41 located at the first receiving position. Can be configured. In addition, the second curl correction unit can be configured by the switchback unit U4 and the transport roller 75 as described above.

  The guide roller 32 is supported by the vertical frame 6 and is disposed below the print paper P received by the roller pair 41. The configuration of the first curl correction unit will be described in detail. The roller pair 41 of the switchback unit U4 receives the print paper P at the first receiving position and holds it, and the print paper P is cut by the cutter 26. After that, the printed paper P is drawn into the space 12 so that the cut end (rear end) of the printed paper P is positioned on the guide roller 32. The moving mechanism of the switchback unit U4 moves the roller pair 41 downward as shown in FIG. 9 after the rear end portion of the print paper P is positioned on the guide roller 32. The rear end portion is pressed against the guide roller 32 and bent to the opposite side of the curl to correct the curl of the rear end portion, and after the curl correction, the roller pair 41 that holds the print paper P. Is moved to the delivery position. The curl correction amount of the print paper P by the first curl correction unit can be adjusted by changing the downward movement amount of the roller pair 41. The configuration of the second curl correction unit is as described above.

  When the curl correction apparatus has the first and second curl correction units, when the curl correction is performed on the intermediate portion and the rear end portion of the print paper P by the second curl correction unit, It is possible to make the downward movement speed relatively high. As a result, the time required for curl correction is shortened.

  In addition, the configuration of the curl correction apparatus in the above embodiment is an exemplification, and the curl correction amount for the front end portion and / or the rear end portion of the print paper P and at least the curl correction amount for the middle portion in the length direction can be changed. If so, the present invention can be applied to any type of curl correction apparatus.

  For example, as shown in FIG. 10, a so-called short loop is formed so that the print paper P is bent between the first and second roller pairs 33 and 41 in the direction opposite to the curl direction. The curl may be corrected accordingly. The configuration of the curl correcting device will be specifically described. A first roller pair 33 supported by the vertical frame 6 is provided on the downstream side of the cutter unit U2. Each of the roller pairs 33 is configured to be rotatable about a central axis, and is opposed to each other in the vertical direction so as to sandwich the print paper P therebetween. One of the roller pairs 33 is a drive roller 33a. The other is a driven roller 33b. The first roller pair 33 has a role of sending the print paper P conveyed from the cutter unit U2 to the switchback unit U4. The second roller pair 41 is the roller pair 41 in the switchback unit U4.

  When the roller pair 41 of the switchback unit U4 receives the print paper P at the first receiving position, the drive roller 41a of the roller pair 41 rotates counterclockwise and is sent out by the first roller pair 33. P is received and gripped, but the print speed is reduced between the first and second roller pairs 33 and 41 by making the rotation speed of the second roller pair 41 lower than the rotation speed of the first roller pair 33. A short loop of P is formed (see the dashed line in FIG. 10). In this curl correction apparatus, the size of the short loop is changed, that is, the speed difference between the rotation speed of the first roller pair 33 and the rotation speed of the second roller pair 41 is changed, thereby allowing the print paper to be printed. It is possible to change the curl correction amount of P. Therefore, when curl correction is performed on the leading edge and / or trailing edge of the print paper P, the rotational speed difference between the first and second roller pairs 33 and 41 is increased so that the print paper P is sufficiently bent. On the other hand, when curl correction is performed on the intermediate portion of the print paper P, the rotational speed difference is reduced. This makes it possible to change the curl correction amount for the front end portion and / or the rear end portion of the print paper P and at least the curl correction amount for the middle portion in the length direction, and shorten the time required for curl correction. Figured. In order to ensure that the direction of the short loop is opposite to the curl direction of the print paper P, the second roller pair 41 is configured to be tiltable as shown by a two-dot chain line in FIG. Also good.

  In the above-described embodiment, the amount of curl correction for both the front end portion and the rear end portion of the print paper P is increased. However, only the amount of curl correction for either the front end portion or the rear end portion of the print paper P is increased. It may be. In addition, the curl correction amount for the front end portion and / or the rear end portion of the print paper P is large, and the curl correction amount for the intermediate portion is small. This is because the print paper P is moved from the print stand 66 in the print unit U5. The curl correction amount for the front end portion and / or the rear end portion of the print paper P and the curl correction amount for the intermediate portion are set on the premise of the configuration of conveying and discharging in an oblique direction. The print unit U5 and other units What is necessary is just to set suitably according to this structure. That is, the curl correction amount for the front end portion and / or the rear end portion of the print paper P may be set small, and the curl correction amount for the intermediate portion may be set large.

  Furthermore, in the above embodiment, both the magazine housing portion 2 and the cassette housing portion 3 are provided, but only the magazine housing portion 2 may be provided.

  In addition, in the above embodiment, the printer of the present invention is applied to an ink jet printer used in a photographic print system. However, from a paper set unit in which a long print paper P is set in a roll shape. The present invention can be applied to any printer as long as the print paper P is pulled out and conveyed to the printing unit 4.

  INDUSTRIAL APPLICABILITY The present invention is useful for a printer in which a print paper set in a state of being rolled around a paper set unit is pulled out from the paper set unit and conveyed to the print unit, and is particularly used in a photographic printing system. Useful for inkjet printers.

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. 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. 3 is a view corresponding to FIG. 1 showing another configuration of the curl correction apparatus. FIG. 3 is a view corresponding to FIG. 2 illustrating another configuration of the curl correction apparatus.

Explanation of symbols

P Print paper 2 Magazine housing (paper set)
4 Print unit U4 Switchback unit (curl correction device)
26 Cutter (cutting means)
41 Roller pair 66 Print stand 75 Conveying roller (holding member of curl correction device)

Claims (3)

A paper set unit that is set in a state where a long print paper is wound in a roll shape, a print unit that performs printing on the print paper, and the print paper that is set in the paper set unit to the print unit A printer having a conveyance path for conveying,
A cutting means provided in the middle of the transport path, for cutting the printed paper drawn from the paper set section into a predetermined length; and provided upstream of the print section and downstream of the cutting means. A curl correcting device for correcting curling due to curling of the roll in the printed paper after being cut by the means,
The curl correction device is configured to change a correction amount of curl correction with respect to one or both ends of the cut print paper and a correction amount of curl correction with respect to at least a middle portion in the length direction of the print paper. Printer characterized by being. The printer according to claim 1.
The curl correcting device includes a holding member that holds one end of the cut print paper, and extends along the width direction of the print paper held by the holding member, and is opposed to each other between the print paper. A pair of rollers gripping the vicinity of the one end of the paper and a pair of rollers gripping the print paper while being held by the holding member. The print paper is bent to one roller of the pair of rollers in a direction opposite to the curl. And a moving mechanism that moves the roller pair to the other roller side in the opposing direction of the roller pair so that tension is applied to the print paper. Along with this, the part of the print paper gripped by the pair of rollers is moved from the vicinity of the one end to the other end side so that the print paper is moved. The very fact, is configured to correct the curl of the printing paper,
The curl correction apparatus is further configured to change a curl correction amount by changing a squeezing operation of the print paper. The printer according to claim 1 or 2,
The printing unit conveys the print paper in an oblique direction from the upstream side of the print table supporting the print paper during printing toward the print table, and in an oblique direction from the print table to the downstream side of the print table. Configured to press the print paper on the print table against the print table by discharging the print paper;
The curl correction apparatus is configured to increase a curl correction amount at one end or both ends of the printed paper and to reduce a curl correction amount at least at a central portion.

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