JP2006143430A - Printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printer using a curled print paper P with a core set capable of sufficiently ensuring the flatness of the paper P at a print unit 4 without any suction device or with a compact suction device. <P>SOLUTION: The paper P is bent in the direction opposite to the curl, and applies tension to the paper P to correct the curl by moving roller pairs 41 to hold a part in a vicinity of a tip of the paper P from the feed position to the receiving position by a moving mechanism after holding the tip of the paper P by a conveying roller 75 as a holding member, and the conveying roller 75 is held while holding the tip of the paper P with the force by which the tip of the paper P is not detached from the conveying roller 75 by the tension. <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, in the above conventional curl correction method, the print paper is simply bent to the opposite side of the curl by one roller, so that it can be sufficiently corrected especially when the curl is largely curled like the center of the roll. Have difficulty. For this reason, depending on the curl amount, there is a possibility that sufficient flatness cannot be ensured at the time of printing. As a result, a large suction device having a large suction force is required, resulting in an increase in cost.

  The present invention has been made in view of such a point, and the object of the present invention is to use a printer that uses a print paper curled by a curl as described above, even if the print paper is largely curled. An object of the present invention is to sufficiently ensure the flatness of the print paper in the printing unit without using a device or with a small suction device.

  In order to achieve the above object, according to the present invention, the curl correction apparatus includes a holding member that holds one end portion of the print paper, and extends in the width direction of the print paper held by the holding member. It is composed of a pair of rollers facing each other and gripping the vicinity of the one end portion of the printed paper, and a moving mechanism for moving the pair of rollers in the facing direction. The curling is corrected by bending and applying tension to the opposite side, and the one end of the print paper is moved by a force that does not cause the one end of the print paper to be detached from the holding member by the tension. Part was held.

  Specifically, according to the first aspect of the present invention, a paper set unit that is set in a state in which a long print paper is wound in a roll, a print unit that performs printing on the print paper, and the paper set The present invention is directed to a printer having a transport path for transporting print paper set in the print section to the print section.

  And provided in the middle of the transport path, a cutting means for cutting the print paper drawn out from the paper set unit to a predetermined length, provided upstream of the print unit and downstream of the cutting unit, A curl correction device that corrects curling due to curling of the roll in the printed paper after being cut by the cutting means, and the curl correction device includes a holding member that holds one end of the printed paper after cutting. A pair of rollers extending in the width direction of the print paper held by the holding member and facing each other in the vicinity of the one end portion of the print paper, and a pair of rollers holding the print paper. The print paper is wound around one roller of the roller pair in a state bent to the opposite side of the curl and the print paper is wound. And a moving mechanism for moving the roller pair to the other roller side in the opposite direction of the roller pair so that tension is applied to the roller, and the roller in the print paper as the roller pair moves by the moving mechanism By moving a portion gripped by the pair from the vicinity of the one end to the other end, the curling of the print paper is corrected, and the holding member is one end of the print paper by the tension. It is assumed that the one end portion of the print paper is held by a force that does not come off the holding member.

  With the above configuration, when the roller pair of the curl correcting device moves to the side opposite to the side on which the print paper protrudes due to curling, the print paper is curled to the roller on the opposite side of the roller pair to the side on which the paper moves. A portion of the print paper that is gripped by the roller pair as the print paper is tensioned between the holding member and the roller pair, and tension is applied between the holding member and the roller pair. Moves from the vicinity of one end to the other end. At this time, since the holding member holds one end of the print paper with a force that does not cause the tip of the print paper to be detached from the holding member due to the tension, one end of the print paper is moved during the movement of the roller pair. Is maintained by the holding member. 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, the print paper is not only bent but also tensioned while being gripped by a pair of rollers, so that even curled print paper can be sufficiently corrected. Therefore, the flatness of the printed paper in the printing unit can be sufficiently ensured without the suction device or with a small suction device.

  According to a second aspect of the invention, in the first aspect of the invention, the roller pair of the curl straightening device may be disposed before or after the print paper is cut by the cutting means from an upstream conveyance path located upstream of the curl straightening device. The curl correction apparatus is configured to receive and hold the printed paper that has been conveyed, and the movement mechanism of the curl correction device receives the print paper from the upstream conveyance path and receives the printed paper, and the receiving position. The print paper is provided at a position away from the curl correction apparatus by a predetermined distance, and is configured to move between a delivery position for sending the print paper to a downstream conveyance path located on the downstream side of the curl correction device, and The pair of rollers of the curl correction apparatus is configured to receive the print paper, which is gripped at the receiving position and cut by the cutting means, by the moving mechanism. After conveying the delivery position above, it assumed to be configured to deliver to the downstream transport path in said transmission out position.

  Thus, the roller pair and the moving mechanism have a role as a paper transport device that grips the print paper at the receiving position and transports it to the sending position. In a printer equipped with such a paper transport device, the curl correction The main part of the apparatus can also be used as the paper conveying apparatus, and the cost increase can be suppressed.

  According to the invention of claim 3, in the invention of claim 2, the holding member of the curl correction device is provided in the vicinity of the roller pair located at the sending position in the downstream side conveyance path, and at the sending position, the holding member is provided. The curl correction device is configured to hold the leading end portion of the print paper fed by the roller pair, and the leading end portion of the print paper fed by the roller pair at the feeding position is held by the holding member. After that, the roller pair is moved from the sending position to the receiving position by a moving mechanism, and the curl of the printed paper is corrected when the roller pair is moved to the receiving position.

  As a result, the curl of the printed paper is corrected when the roller pair returns from the sending position to the receiving position. Therefore, the roller pair returning process that does not substantially convey in the paper conveying apparatus is effectively used as the curl correcting process. can do.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the holding member of the curl correction apparatus is composed of a plurality of rollers that sandwich the print paper in the thickness direction, and receives the print paper fed by the roller pair at the feed position. It is assumed that the conveyance roller that conveys to the printing unit is configured to hold and hold the leading end portion of the print paper while the conveyance is stopped during the curl correction of the print paper.

  As a result, the holding member can be easily configured, the front end of the printed paper can be easily held without scratching the front and back surfaces, and the conveyance roller can be moved after the curl correction is completed. By driving, the printed paper can be easily conveyed to the printing unit.

  In the invention of claim 5, in the invention of claim 4, the transport roller is a roller for controlling the transport amount of the print paper when printing on the print paper in the printing section.

  That is, the transport roller that controls the transport amount of the print paper during printing has a relatively large transport force in order to transport the print paper with high accuracy. Therefore, the force for sandwiching the print paper is also set to be large. Yes. Therefore, it is possible to prevent the leading end portion of the print paper from being detached from the conveyance roller without significantly changing the existing conveyance roller.

  According to a sixth aspect of the present invention, in the second to fifth aspects of the invention, the direction of movement of the print paper when the roller pair of the curl correcting device is received and delivered is a horizontal direction, and the roller pair is It is assumed that they are opposed to each other and are moved up and down by a moving mechanism.

  As a result, the downstream conveyance path (printing unit) and the upstream conveyance path (paper set unit) are arranged vertically, and the length of the printer in the vertical direction can be shortened by making the printer vertically long. it can. In addition, the print paper can be reliably wound around one roller of the roller pair. Therefore, the printer can be easily installed in a narrow space and the curl correction can be reliably performed.

  As described above, according to the printer of the present invention, the print paper is corrected by curling the print paper by bending and applying tension to the opposite side of the curl by moving the roller pair. The holding member that holds the one end is configured to hold the one end of the print paper by a force that prevents the one end of the print paper from being detached from the holding member by the tension. However, by curling the print paper P, it becomes possible to sufficiently perform the curl correction, and the flatness of the print paper in the print unit can be sufficiently secured without a suction device or with a small suction device. The print quality can be maintained at a high level while reducing the cost.

  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 long print paper is set in a state of being rolled. 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 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. . Thus, the conveyance roller 75 is a roller for controlling the conveyance amount of the print paper P when printing on the print paper P in the printing unit 4.

  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 sent out by the roller pair 41 positioned at the sending position is also received and conveyed to the printing unit 4. The transport roller 75 is composed of a plurality of rollers arranged above and below. That is, similar to the feeding roller 25 in the cutter unit U2, the driving roller 75a (lower roller) and the two driven rollers 75b (upper roller) sandwich the print paper P up and down. The driven roller 75b is pressed against the drive roller 75a by one compression coil spring 76. 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. 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 of holding the leading end portion of the print paper P sent out by the roller pair 41 of the switchback unit U4 at the sending position, and the roller pair 41 is transported. The print paper P held by the rollers 75 extends along the width direction of the print paper P and faces each other, and the vicinity of the tip end portion of the print paper P is held therebetween. That is, the transport roller 75 operates when it receives the print paper P sent out from the switchback unit U4 and sandwiches the leading end portion (rear end portion at the time of receiving) up and down by the driving roller 75a and the driven roller 75b. It stops once and hold | maintains this front-end | tip part. 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, after the leading end of the print paper P is held by the transport roller 75, the roller pair 41 holding the print paper P is moved by the moving mechanism of the switchback unit U4. It moves to the drive roller 41a side in the facing direction. 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. At this time, the transport roller 75 holds and holds the front end portion of the print paper P with a force that does not cause the front end portion of the print paper P to be detached from the transport roller 75 by the tension in a state where transport is stopped. Yes. That is, the pressing force of the driven roller 75b against the driving roller 75a by the compression coil spring 76 is F, the friction coefficient between the driving roller 75a and the print paper P is μ, and the maximum value of the tension applied to the print paper P is set. Where T is
F × μ> T
The pressing force F is set so as to satisfy the above. As a result, during the movement of the roller pair 41, the state where the leading end portion of the print paper P is held by the transport roller 75 is maintained. 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 amount of curl correction of the print paper P by the curl correcting device 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 amount may be adjusted after the completion of the ink jet printer in a factory or the like before shipment, or may be freely adjusted by the user. Further, the ink jet printer itself may detect the curl amount of the print paper P and automatically adjust it.

  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. 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, the drive roller 41a of the roller pair 41 may be rotated forward or reverse, or may be stopped. 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, 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 embodiment, the curl correcting 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 printing unit 4, and this curl correcting device is used for printing by the transport roller 75. After holding the front end of the paper P, the roller pair 41 that grips the vicinity of the front end of the print paper P is moved from the sending position to the receiving position by the moving mechanism, so that the print paper P is moved away from the curl. In addition to bending, the tension is applied while being gripped by the roller pair 41 to correct the curl, and the print roller P is moved by a force that prevents the leading end of the print paper P from being removed from the transfer roller 75 by the tension. Because it is configured to hold and hold the leading edge of the print paper P, even if the print paper P is greatly curled, It is possible to sufficiently perform the curl correction by squeezing the Ntopepa P. As a result, the flatness of the print paper can be ensured even if the print paper P from the magazine housing unit 2 is not held by suction on the upper surface of the print table 66. Alternatively, the flatness of the print paper P in the print unit 4 can be sufficiently secured with a simple and small suction device. In addition, since the print unit 4 (downstream transport path) and the magazine housing unit 2 (upstream transport path) are arranged vertically, the ink jet printer does not become horizontally long, and the first transport path is switched. Since the upstream transport path and the first receiving position located on the upstream side of the back unit U4 are provided above the roll center of the print paper P set in the magazine housing unit 2, the upstream transport path is Combined with the fact that the print paper P does not need to be bent and folded over the downstream side conveyance path, the upstream side conveyance path and the downstream side conveyance path can be arranged close to each other, and the ink jet printer can be moved up and down as well as horizontally. The direction can also be made compact (if the cassette housing part 3 is eliminated as described later, it can be made even more compact). Therefore, it is possible to secure the flatness of the print paper P in the print unit 4 at a low cost while reducing the size of the entire inkjet printer, and it is possible to maintain the print quality at a high level while reducing the cost.

  Further, in the above embodiment, the magazine accommodating portion 2, the cassette accommodating portion 3, and the printing portion 4 are arranged in the vertical direction, and the roller pair 41 of the switchback unit U4 corresponds to the vertical position in the vertical direction. Since it is configured to move, it is possible to shorten the length of the case 1 in the left-right direction and the front-rear direction by making the case 1 vertically long. Moreover, since the print paper P is moved in the front-rear direction of the casing, the length of the casing 1 in the left-right direction can be particularly shortened. Therefore, the printer can be easily installed in a narrow space.

  Furthermore, if the cassette housing part 3 is eliminated, the height of the housing 1 can be reduced, and a compact printer can be obtained as a whole. That is, in the configuration in which the switchback unit U4 is provided, the distance between the downstream end of the upstream conveyance path and the upstream end of the downstream conveyance path can be made as small as possible in terms of space. On the other hand, when the magazine storage unit 2 and the print unit 4 are arranged side by side in the vertical direction and the print paper P is continuously transported from the magazine storage unit 2 to the print unit 4 without being cut, the print paper P is abruptly moved. Since it cannot be bent, a certain amount of space in the up and down direction is required at the folded portion, and it is difficult to reduce the height of the housing 1 even if the cassette housing portion 3 is omitted. Therefore, the configuration provided with the switchback unit U4 is advantageous in that the height of the housing 1 can be reduced.

  In the above embodiment, the curl is corrected by moving the roller pair 41 downward from the delivery position, but the print paper P is curled on the opposite side to the above embodiment (length). In the case where the central portion in the direction protrudes toward the back side with respect to both end portions), the curl correction may be performed by moving the roller pair 41 upward from the first receiving position. That is, in this case, a holding member that holds one end portion of the print paper P is provided at the downstream end portion (downstream side of the cutter 26) of the cutter unit U2, and the roller pair 41 is at the first receiving position. When receiving and retracting P, the rear end portion of the cut print paper P is held by the holding member, and in this holding state, the roller pair 41 holding the print paper P is moved upward. By this movement, the print paper P is wound around one roller (here, the lower drive roller 41a) of the roller pair 41, and tension is applied to the portion of the print paper P between the holding member and the roller pair 41. With this movement, the portion of the print paper P gripped by the roller pair 41 is moved from the vicinity of the rear end portion to the front end portion side.

  Further, when the print paper P is curled as in the above-described embodiment (curled so that the central portion in the length direction protrudes toward the print surface with respect to both end portions), the roller pair 41 is moved to the first position. The curl may be corrected by moving downward from one receiving position. Also in this case, a holding member that holds one end (rear end) of the print paper P may be provided at the downstream end of the cutter unit U2 (downstream from the cutter 26).

  Furthermore, in the above embodiment, the movement mechanism of the curl correction device moves the roller pair 41 in the vertical direction. However, the present invention is not limited to this, and the movement direction (that is, the facing direction) of the roller pair 41 is switchback. What is necessary is just to set suitably by positional relationship with unit U4, a holding member, an upstream conveyance path, a downstream conveyance path, etc. However, the arrangement as in the above embodiment is preferable because the entire inkjet printer can be made compact.

  In the above-described embodiment, the holding member of the curl correction device is configured by the conveyance roller 75 that receives the print paper P sent out by the roller pair 41 located at the sending position and conveys it to the printing unit 4. Not limited to this, the print paper P may be configured by a gripping member or the like that can grip the print paper P in the thickness direction.

  Further, in the above embodiment, the curl correction device is configured by using the switchback unit U4. However, the paper conveyance that sends the print paper P to the downstream conveyance path in the same direction as the print paper movement direction at the time of reception at the sending position. It is also possible to configure the curl correction device using the device (the other configuration is the same as that of the switchback unit U4). However, in this case, since the downstream conveyance path is disposed on the opposite side of the upstream conveyance path with respect to the paper conveyance device, from the viewpoint of shortening the front-rear direction of the housing 1, the above embodiment is used. Thus, it is preferable to use the switchback unit U4 having the switchback function and the paper transport function.

  Moreover, in the said embodiment, although both the magazine accommodating part 2 and the cassette accommodating part 3 were provided, you may make it provide only the magazine accommodating part 2. FIG.

  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 rear 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.

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 45 Rail mount (movement mechanism)
46 Traveling rail (movement mechanism)
47 Pulley (movement mechanism)
48 Drive belt (moving mechanism)
49 Electric motor (movement mechanism)
75 Conveyor roller (curl correction device)

Claims (6)

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 correction device for correcting curling due to curling of the roll in the printed paper after being cut by the means,
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 roller and a pair of rollers gripping the print paper, and the print paper is wound around one roller of the pair of rollers while being bent on the opposite side of the curl; A moving mechanism for moving the print paper toward the other roller in the opposing direction of the roller pair so that tension is applied to the print paper. By moving the portion gripped by the roller pair from the vicinity of the one end to the other end, the curl of the print paper is corrected. It has been,
The printer, wherein the holding member is configured to hold one end portion of the print paper with a force that does not cause the one end portion of the print paper to be detached from the holding member by the tension. The printer according to claim 1.
The roller pair of the curl correction apparatus is configured to receive and grip the print paper conveyed from the upstream conveyance path located upstream of the curl correction apparatus before or after the print paper is cut by the cutting means. And
The movement mechanism of the curl correction device is provided at a receiving position for receiving and gripping the print paper from the upstream conveyance path, and at a position separated from the receiving position by a predetermined distance. , Configured to move between a sending position and a sending position that is sent to a downstream conveyance path located on the downstream side of the curl correction device,
Further, the roller pair of the curl correction device conveys the print paper gripped at the receiving position and cut by the cutting means from the receiving position to the sending position by the moving mechanism, and the sending position. The printer according to claim 1, wherein the printer is configured to send out to the downstream conveyance path. The printer according to claim 2.
The holding member of the curl correction apparatus is provided in the vicinity of the roller pair located at the sending position in the downstream conveyance path, and holds the leading end portion of the print paper sent by the roller pair at the sending position. Is configured as
The curl correcting device moves the roller pair from the sending position to the receiving position by a moving mechanism after the front end portion of the print paper sent by the roller pair at the sending position is held by the holding member. A printer configured to correct curl of the print paper when moved to the receiving position. The printer according to claim 3.
The holding member of the curl correction apparatus is a transport roller that includes a plurality of rollers that sandwich the print paper in the thickness direction, and that receives the print paper fed by the roller pair at the feed position and transports the print paper to the printing unit. A printer configured to hold and hold the leading end portion of the print paper while the conveyance is stopped during paper curl correction. The printer according to claim 4.
A printer, wherein the conveyance roller is a roller for controlling a conveyance amount of the print paper when printing on the print paper in the printing unit. In the printer as described in any one of Claims 2-5,
The direction of movement of the print paper at the time of receiving and sending out the print paper of the roller pair of the curl correction device is a horizontal direction,
The printer according to claim 1, wherein the pair of rollers are opposed to each other in the vertical direction and are moved in the vertical direction by a moving mechanism.

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