JP2012139906A - Inkjet recording apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inkjet recording apparatus suppressing degradation in image recording accuracy.SOLUTION: The inkjet recording apparatus includes: a platen 36; a recording part 40 arranged above the platen 36; a pair of paper discharge rollers 54 arranged in front of the platen 36; a movable guide member 70 turnably provided between the platen 36 and the pair of paper discharge rollers 54; a drive part; and a control part. The control part determines the displacement amount of the movable guide member 70 on the basis of the kind of a medium to be recorded 14 and the amount of ink discharged by the recording part 40 and controls the drive part to change the posture of the movable guide member 70 to the posture corresponding to the displacement amount and let out the top end of the medium to be recorded 14 downward in a conveyance direction 38. After that, the control part 18 returns the movable guide member 70 to a support posture, and guides the top end of the medium to be recorded 14 to the nip position of the pair of paper discharge rollers 54 by the movable guide member 70.

Description

  The present invention relates to an ink jet recording apparatus that ejects ink onto a recording medium to be conveyed.

  A pair of transport rollers and a pair of paper discharge rollers arranged side by side in the horizontal direction, a platen disposed between the pair of transport rollers and the pair of paper discharge rollers, and a recording head disposed above the platen and ejecting ink droplets; There is an ink jet recording apparatus provided with (see, for example, Patent Document 1). The recording medium is conveyed toward the recording head by a pair of conveying rollers, and an image is recorded from the leading end side in the conveying direction by the recording head. When the leading end reaches the pair of discharging rollers, the pair of conveying rollers and the discharging roller pair Be transported.

JP 2006-15533 A

  In an ink jet recording apparatus, a recording medium may bend so as to swell upward due to ink adhesion. When the recording medium bends, the recording medium may come into contact with the recording head or the guide member, causing jamming. In order to solve this problem, a guide member capable of changing its posture is provided between the recording head and the pair of paper discharge rollers, and when the recording medium is bent, the guide member is lowered to lower the tip of the recording medium. It is possible to escape.

  However, since the amount of deflection of the recording medium varies depending on the ink ejection amount, if the guide member is lowered too much when the deflection amount is small, the distance between the recording medium and the recording head becomes too large. The image recorded on the camera will be disturbed. That is, if the guide member is lowered too much, the accuracy of image recording is reduced.

  In view of the above problems, an object of the present invention is to provide an ink jet recording apparatus capable of suppressing a decrease in accuracy of image recording.

  (1) An inkjet recording apparatus of the present invention supports a recording medium to be transported by being arranged on the downstream side in the transport direction with respect to the first transport mechanism and a first transport mechanism that transports the recording medium in the transport direction. A platen, a second transport mechanism that is disposed downstream of the platen in the transport direction, and that transports a recording medium in the transport direction by a driving roller and a driven roller facing the drive roller, and is disposed above the platen. And a recording head that discharges ink droplets toward a recording medium based on print data, a nip position between the drive roller and the driven roller of the second transport mechanism, and the transport direction of the platen. A recording medium disposed in between and in a first posture for guiding a recording medium conveyed by the first conveying mechanism to the nip position and in the conveying direction. A plurality of guide members whose posture can be changed to a second posture with the tip of the guide member positioned below the nip position, a drive unit that changes the posture of the guide member, and the drive of the drive unit to control the posture of the guide member And a control unit for changing. The control unit determines a displacement amount of the guide member from the first posture based on the print data, and controls the driving of the driving unit to bring the guide member into a posture corresponding to the displacement amount.

  The amount of deflection of the recording medium is determined by the amount of ink ejected to the recording medium. This ink amount is based on the print data. The displacement amount of the guide member is also based on the print data. That is, the posture of the guide member is changed by an appropriate amount of displacement corresponding to the amount of deflection of the recording medium. A change in posture of the guide member by an appropriate amount of displacement corresponding to the amount of deflection of the recording medium can suppress a decrease in image recording accuracy.

  (2) The control unit may determine the amount of displacement based on ink amount information that is information on the amount of ink ejected to a recording medium in the print data.

  (3) The control unit may increase the displacement amount as the ink amount increases. The amount of displacement of the guide member can be easily set to an appropriate amount.

  (4) The control unit determines whether or not to set the displacement amount to zero based on the type information of the recording medium, and determines that the displacement amount is not set to zero. The amount may be determined. The control unit sets the amount of displacement to zero when recording an image on a recording medium having a high rigidity that does not bend regardless of the amount of ejected ink. When recording an image on a recording medium with low rigidity, the control unit sets the amount of displacement according to the amount of ink ejected onto the recording medium. The accuracy of image recording onto a recording medium with low rigidity can be increased without reducing the accuracy of image recording onto a recording medium with high rigidity.

  (5) The ink jet recording apparatus of the present invention is provided upstream of the guide member in the transport direction, and includes a first detection unit that detects a leading end of the transported recording medium, and a transport amount of the recording medium. And a second detection unit for detecting. The control unit controls driving of the driving unit based on detection results of the first detection unit and the second detection unit, and the control unit performs the above-described operation until the leading end of the recording medium in the transport direction reaches the guide member. The guide member is set in a posture corresponding to the displacement amount, and the guide member is set in the first posture until the tip reaches the nip position. While the recording medium is transported in a state where the guide member is in the second posture, the amount of bending is reduced by drying of the ink, and the recording medium is guided to the nip position of the second transport mechanism by the guide member in the first posture. .

  (6) The ink jet recording apparatus of the present invention further includes a contact member disposed above the guide member. The control unit controls driving of the driving unit, and after the leading end of the recording medium in the transport direction exceeds the contact member, changes the posture of the guide member from the second posture to the first posture. Thus, the recording medium is brought into contact with the contact member. The recording medium is corrected to bend by being brought into contact with the contact member by the guide member in the first posture.

  (7) The control unit determines, based on the print data, an area in which ink droplets are ejected by the recording head before a line feed operation in which the leading end of the recording medium in the transport direction reaches the nip position. The displacement amount may be determined from information corresponding to an image recorded in the specific area in the print data. Compared to the case where the displacement amount is determined by the amount of ink ejected to the entire recording medium, the accuracy of image recording can be improved.

  (8) The control unit may determine the displacement amount based on information on a total amount of ink droplets ejected to the specific area in the print data.

  (9) The control unit controls the driving of the first transport mechanism and the ejection of ink droplets on the recording head, and ejects ink droplets onto the recording head after stopping the transportation of the recording medium on the platen. The image recording operation for one line to be performed and the line feed operation for transporting the recording medium by the predetermined transport amount determined from the print data are alternately performed. Based on the print data, It is also possible to estimate the maximum amount of the ink discharge amount for each row in the image recording operation of a plurality of rows and determine the displacement amount from the estimated maximum amount.

  (10) The guide member is provided so as to be rotatable about a rotation shaft disposed on the upstream side in the conveyance direction of the guide member, and the driving unit rotates a tip on the downstream side in the conveyance direction. It may be rotated as a moving tip. Since the guide member is pivoted with the leading end downstream in the transport direction as the pivot tip, the leading end of the recording medium in the transport direction is gradually released downward, and the entire guide member is moved downward. The accuracy of image recording can be improved.

  (11) At least one of the driving roller and the driven roller of the second conveying mechanism is a plurality of the rollers arranged in parallel along the rotation axis direction, and the guide member is configured to convey the conveying roller in the first posture. A first guide end facing the nip position in the direction and a second guide end extending between the adjacent rollers in the rotation axis direction and extending downstream from the first guide end in the transport direction. May be provided. The leading end of the recording medium in the transport direction can be guided to a position closer to the nip position of the second transport mechanism by the second guide end.

  (12) In the first posture, the guide member is disposed on the downstream side in the transport direction with respect to the first guide surface along the transport direction, and upwards toward the downstream side in the transport direction. And a second guide surface inclined toward the top. The leading end of the recording medium is smoothly guided to the nip position of the second transport mechanism by the second guide surface.

  In the ink jet recording apparatus of the present invention, the amount of displacement of the guide member is determined based on the print data, and the guide member is placed in a posture corresponding to the amount of displacement. The leading edge of the recording medium can be released downward, and a decrease in the accuracy of image recording can be suppressed.

It is a perspective view of an inkjet recording device. It is a typical sectional view of a printer part. It is a bottom view of the recording head. It is a perspective view of a movable guide member. It is a perspective view of a printer part. It is a perspective view of a part of a printer unit. It is operation | movement explanatory drawing explaining operation | movement of a movable guide member. It is a block diagram of an inkjet recording device. It is the flowchart in which operation | movement of the control part was shown.

  Embodiments of the present invention will be described below with reference to the drawings as appropriate. Note that the embodiment described below is merely an example of the present invention, and it is needless to say that the embodiment of the present invention can be appropriately changed without departing from the gist of the present invention. In the following description, the vertical direction 7 is defined with reference to the state where the inkjet recording apparatus 10 is installed (the state shown in FIG. 1), and the front-rear direction 8 is defined with the side where the input unit 17 is provided as the front side. Then, the left-right direction 9 is defined when the ink jet recording apparatus 10 is viewed from the front side.

[Outline of Inkjet Recording Apparatus 10]
As shown in FIG. 1, the ink jet recording apparatus 10 has a substantially rectangular parallelepiped shape. The ink jet recording apparatus 10 is a multifunction machine that includes a lower printer unit 11 and an upper scanner unit 12 and can perform printing, scanning, copying, and the like. The printer unit 11 and the scanner unit 12 operate according to a signal input from an input device 17 or an external device such as a personal computer.

  The printer unit 11 accommodates a paper feed cassette 60 that accommodates a recording medium 14 (FIG. 2) such as plain paper, glossy paper, or a postcard in a lower portion so that it can be pulled out forward. The paper feed cassette 60 has a flat rectangular parallelepiped shape with an opening on the rear side. As shown in FIG. 2, the recording medium 14 is placed on the bottom 63 of the paper feed cassette 60. The rear wall 64 of the paper feed cassette 60 extends rearward and obliquely upward from the rear end of the bottom 63. The recording medium 14 delivered by a later-described feeding mechanism 20 moves rearward and obliquely upward by making sliding contact with the rear wall 64.

  As shown in FIG. 2, the printer unit 11 includes a feeding mechanism 20, a transport unit 30, a recording unit 40, a detection mechanism 90 (FIG. 8), and a driving unit 80 (FIG. 8).

[Feeding mechanism 20]
As shown in FIG. 2, the feeding mechanism 20 includes a first rotating shaft 21 rotatably supported by the frame 19 (FIGS. 5 and 6), and an arm 22 having one end supported by the first rotating shaft 21. And a pair of left and right feeding rollers 23 rotatably supported at the other end of the arm 22. The first rotation shaft 21 has a round bar shape extending along the left-right direction 9 and is rotated by the drive unit 80.

  One end of the arm 22 is supported by the first rotation shaft 21 so as to be rotatable about the first rotation shaft 21. Accordingly, the feeding roller 23 provided at the other end of the arm 22 is displaced up and down by the rotation of the arm 22 around the first rotation shaft 21. The arm 22 is rotated by slidingly contacting a sliding contact surface (not shown) provided in the paper feeding cassette 60 when the paper feeding cassette 60 is slid in the front-rear direction 8. The feeding roller 23 is displaced up and down by the rotation of the arm 22. The feed roller 23 is pressed against the recording medium 14 accommodated in the paper feed cassette 60 when the arm 22 is biased by a spring or its own weight.

  The feeding roller 23 is rotated by transmitting the rotation of the first rotating shaft 21 by a first drive transmission mechanism 85 (FIG. 8) described later, and feeds the recording medium 14 backward. The recording medium 14 sent out backward is transported by the transport unit 30.

[Conveying unit 30]
As shown in FIG. 2, the transport unit 30 includes a transport path 31, a transport roller pair 51, and a paper discharge roller pair 54. The conveyance path 31 is a space defined by the first guide member 32, the second guide member 33, the movable guide member 70, the platen 36, and the like. The recording medium 14 passes through the conveyance path 31. The conveyance path 31 starts from the rear end of the paper feed cassette 60 and curves upward from the paper feed cassette 60 and then extends linearly forward. The platen 36 is disposed above the paper feed cassette 60. The second guide member 33 and the movable guide member 70 will be described in detail later.

  The conveyance roller pair 51 is disposed behind the platen 36. The transport roller pair 51 includes a first drive roller 52 provided on a third rotating shaft 59 extending along the left-right direction 9 and a first driven roller 53 that is driven by the first drive roller 52. The first driving roller 52 and the first driven roller 53 are opposed to each other with the conveyance path 31 therebetween. The conveyance roller pair 51 conveys the recording medium 14 with the third rotating shaft 59 being rotated by the driving unit 80. The conveyance roller pair 51 corresponds to a first conveyance mechanism.

  The paper discharge roller pair 54 is disposed in front of the platen 36. The paper discharge roller pair 54 includes a plurality of second drive rollers 55 provided on a second rotating shaft 57 extending along the left-right direction 9 and a plurality of second driven rollers 56. The plurality of second drive rollers 55 are separated from each other in the left-right direction 9. The plurality of second driven rollers 56 are separated from each other in the left-right direction 9. The second drive roller 55 and the second driven roller 56 are opposed to each other with the conveyance path 31 in between. The paper discharge roller pair 54 conveys the recording medium 14 with the second rotating shaft 57 rotated by the drive unit 80. The paper discharge roller pair 54 corresponds to a second transport mechanism. The second drive roller 55 corresponds to the drive roller. The second driven roller 56 corresponds to the driven roller. An image is recorded by the recording unit 40 on the recording medium 14 conveyed by the conveying roller pair 51 or the discharge roller pair 54.

[Recording unit 40]
As shown in FIGS. 2 and 5, the recording unit 40 is held by a carriage 41 disposed above the platen 36. The carriage 41 is supported by the guide rail 37 so as to be movable along the left-right direction 9 across the pair of front and rear guide rails 37 shown in FIG. That is, the recording unit 40 is slidably provided above the platen 36.

  As shown in FIG. 2, the recording unit 40 includes four sub tanks 43 that store ink supplied from an ink cartridge (not shown) and a recording head 42. The recording head 42 includes a plurality of nozzles 45 (see FIG. 3) facing the platen 36, an ink flow path (not shown) that connects the sub tank 43 and the nozzle 45, and a part of the ink flow path to deform the nozzles 45. And a piezoelectric element 44 (see FIG. 8) for discharging ink droplets from the ink droplets.

  Each sub tank 43 stores one of inks of cyan, magenta, yellow, and black. As shown in FIG. 3, a first nozzle row 46 including a plurality of nozzles 45 is provided for the cyan sub tank 43. The first nozzle row 46 extends along the front-rear direction 8. Similar to the first nozzle row 46, a second nozzle row 47, a third nozzle row 48, and a fourth nozzle row 49 are provided for the magenta, yellow, and black sub-tanks 43, respectively.

  The piezoelectric element 44 shown in FIG. 8 operates by being fed by the control unit 18 via a drive circuit (not shown). The control unit 18 controls power feeding to the piezoelectric element 44 and selectively ejects ink droplets from the plurality of nozzles 45 of the nozzle rows 46 to 49. Further, the control unit 18 adjusts the size of the ink droplet ejected from the nozzle 45 by adjusting the power supply to the piezoelectric element 44 according to the print data.

[Drive unit 80]
As shown in FIG. 8, the drive unit 80 includes a first drive motor 81, a second drive motor 82, a third drive motor 83, and a fourth drive motor 84. The driving force of each of the drive motors 81 to 84 is fed by the first drive transmission mechanism 85, the second drive transmission mechanism 86, the third drive transmission mechanism 87, and the fourth transmission mechanism 88, the discharge roller 23, the transport roller pair 51, This is transmitted to the paper roller pair 54 and the carriage 41.

  The first drive transmission mechanism 85 is a gear mechanism including a plurality of gears (not shown) attached to the arm 22 of the feeding mechanism 30, and the first drive shaft 81 rotated by the first drive motor 81 is rotated. Is transmitted to the feeding roller 23.

  As shown in FIG. 6, the second drive transmission mechanism 86 is a cam belt mechanism, and the second drive motor 82 rotates with the third rotation shaft 59 of the first drive roller 52 and the second rotation shaft of the second drive roller 55. 57. The conveyance roller pair 51 and the discharge roller pair 54 are simultaneously rotated in the direction in which the recording medium 14 is conveyed in the same direction by the second drive transmission mechanism 86. The rotation of the second drive motor 82 in the direction in which the recording medium 14 is transported in the transport direction 38 is assumed to be normal rotation, and will be described below.

  The third drive transmission mechanism 87 is a cam belt mechanism, and moves the carriage 41 (FIG. 2) along the left-right direction 9 by the rotation of the third drive motor 83.

  The fourth drive transmission mechanism 88 is, for example, a gear mechanism, and transmits the rotation of the fourth drive motor 84 to a movable guide member 70 described later that is rotatably provided.

[Detection mechanism 90]
The detection mechanism 90 is for detecting the position of the recording medium 14 being conveyed. As shown in FIG. 8, the detection mechanism 90 includes a sensor 91, a first encoder 92, and a second encoder 93. The sensor 91 corresponds to a first detection unit. The first encoder 92 and the second encoder 93 correspond to a second detection unit.

  As shown in FIG. 2, the sensor 91 is disposed on the upstream side in the conveyance direction 38 of the conveyance roller pair 51. The sensor 91 includes a photo interrupter having a light emitting diode and a photodiode, and a detector provided in the transport path 31 so as to be able to appear and disappear. When the orientation of the detector is changed by being pushed by the conveyed recording medium 14, the light from the light emitting diode is blocked from reaching the photodiode, or the light blocked by the detector is applied to the photodiode. The output of the sensor 91 changes. That is, the output of the sensor 91 differs depending on whether the recording medium 14 passes through the place where the detector is provided or not. The output of the sensor 91 is input to the control unit 18 (FIG. 8). The control unit 18 detects that the leading end or the trailing end of the recording medium 14 in the transport direction 38 has passed through the sensor 91 based on the output change of the sensor 91.

  As shown in FIG. 5, the first encoder 92 includes a photo interrupter 95 and a disk 96 attached to the third rotating shaft 59 of the first drive roller 52. A light transmitting portion that transmits light and a light blocking portion (not shown) that blocks light are provided on the disk 96. Due to the rotation of the disk 96, the light transmitting portion and the light shielding portion alternately pass on the optical path of the photo interrupter, and the output of the first encoder 92 changes. That is, the output of the first encoder 92 changes by the number of times corresponding to the rotation amount of the first drive roller 52. Therefore, the number of output changes of the first encoder 92 corresponds to the transport amount of the recording medium 14 transported by the transport roller pair 51 or the discharge roller pair 54.

  The second encoder 93 includes a photo interrupter and a disk (not shown) having the same configuration as the first encoder 92. The disk is attached to the first drive motor 81 or the first rotating shaft 21. The output of the second encoder 93 changes by the number of times corresponding to the amount of rotation of the first drive motor 81 or the first rotary shaft 21. Therefore, the number of output changes of the second encoder 93 corresponds to the transport amount of the recording medium 14 transported by the feeding roller 23.

  The number of output changes of the first encoder 92 and the second encoder 93 is counted by a counter and input to the control unit 18. The control unit 18 includes a storage unit that stores predetermined values corresponding to positions in the conveyance direction 38 of the conveyance roller pair 51, a spur roller 34, which will be described later, and a guide drive table which will be described later. The control unit 18 estimates the leading end position of the recording medium 14 in the transport direction 38 from the number of output changes of the first encoder 92 and the second encoder 93 since the output of the sensor 91 has changed.

[Movable guide member 70]
As shown in FIG. 2, the movable guide member 70 is disposed between the platen 36 and the nip position of the paper discharge roller pair 54. The movable guide member 70 is for guiding the leading end of the recording medium 14 on which the image is recorded on the platen 36 in the transport direction 38 to the nip position of the discharge roller pair 54.

  As shown in FIG. 4, the movable guide member 70 includes a plate-like base 71, a pair of left and right protruding pieces 72 protruding rearward from the rear end sides of the left and right ends of the base 71, and the protruding pieces 72. And a cylindrical shaft protrusion 73 that protrudes from the rear end portion toward the center in the left-right direction 9. The shaft protrusion 73 is supported by the frame 19 as shown in FIG. That is, the movable guide member 70 can rotate around the shaft protrusion 73. The movable guide member 70 corresponds to a guide member. The shaft protrusion 73 corresponds to a rotation shaft.

  When the movable guide member 70 is rotated, the position of the front end thereof is lowered, and the second guide in FIG. 7C is moved from the support posture in FIG. 7A to the first forward tilted posture in FIG. 7B. The posture changes to a forward leaning posture. Alternatively, the posture changes from the second forward leaning posture to the support posture through the first forward leaning posture. The support posture is a posture for guiding the leading end of the recording medium 14 in the transport direction 38 to the nip position of the discharge roller pair 54. The first forward leaning posture and the second forward leaning posture are postures in which the front end portion of the base 71 is positioned below the nip position of the paper discharge roller pair 54, and the front end of the recording medium 14 in the transport direction 38 is downward. It is a posture to escape. When the movable guide member 70 is rotated, the movable guide member 70 has two forward inclined postures having different displacement amounts from the support posture. The support posture corresponds to the first posture. The first forward leaning posture and the second forward leaning posture correspond to the second posture. In the present embodiment, the front end of the movable guide member 70 in the first forward tilt posture is positioned above the front end of the movable guide member 70 in the second forward tilt posture.

  As shown in FIG. 4, a guide surface 78 that is the upper surface of the base 71 of the movable guide member 70 is a rear first guide surface 76 that is substantially horizontal in the support posture, and a front side that rises toward the front in the support posture. The second guide surface 77 is provided. The recording medium 14 reaches the nip position of the discharge roller pair 54 by being guided by the first guide surface 76 and the second guide surface 77 of the movable guide member 70 in the support posture.

  In addition, the movable guide member 70 includes a plurality of first guide end portions 74 and second guide end portions 75 as rotation tips in the support posture. When the movable guide member 70 is in the support posture, the first guide end portion 74 faces the nip position of the paper discharge roller pair 54 in the front-rear direction 8. The second guide end portion 75 is provided between the adjacent first guide end portions 74 and protrudes further forward than the first guide end portion 74. In this state, the second guide end portion 75 is located between a plurality of second drive rollers 55 (second driven rollers 56) spaced apart in the left-right direction 9. By providing the second guide end portion 75, the movable guide member 70 can guide the recording medium 14 to a position closer to the nip position of the discharge roller pair 54.

  Control of the displacement amount of the movable guide member 70 represented by the rotation angle with respect to the support posture is performed by the control unit 18 controlling the rotation amount of the fourth drive motor 84. That is, the posture of the movable guide member 70 is controlled by the control unit 18. For example, a stepping motor whose rotation amount can be controlled by the control unit 18 is used for the fourth drive motor 84. Alternatively, an encoder having the same configuration as described above is provided on the rotation shaft of the fourth drive motor 84, and the control unit 18 controls the rotation amount of the fourth drive motor 84 by counting the number of output changes of the encoder. It may be a configuration.

  The movable guide member 70 is a resin molded product and is lighter than that formed of metal. The movable guide member 70 is maintained in the support posture, the first forward leaning posture, or the second forward leaning posture by the frictional force generated between the shaft protrusion 73 and the frame 19 or the like.

  The movable guide member 70 includes a stopper 79 that contacts the frame 19, the platen 36, and the like in the support posture and the second forward tilt posture. When the stopper 79 contacts the frame 19 and the platen 36, the movable guide member 70 is prevented from rotating beyond the support posture and the second forward tilt posture.

[Second guide member 33]
As shown in FIG. 2, the second guide member 33 is disposed above the movable guide member 70. A spur roller 34 is rotatably provided on the second guide member 33. The spur roller 34 is disposed above the first guide surface 76 of the movable guide member 70. The spur roller 34 corresponds to a contact member.

[Control unit 18]
The control unit 18 is realized by a microcomputer mounted on a substrate (not shown) and various electronic components. The control unit 18 includes a storage unit in which the above-described predetermined values are stored, and operates the printer unit 11 based on these predetermined values, a signal input from the detection mechanism 90, input print data, and the like. . The print data includes type information about the type of recording medium 14 to be used, image information about an image to be recorded, and the like.

[Operation of Printer Unit 11]
When receiving a print instruction based on the print data, the control unit 18 rotates the first drive motor 81 to perform feeding. The control unit 18 monitors the position of the front end of the recording medium 14 from the output change of the sensor 91 and the number of output changes of the second encoder 93 and a predetermined value corresponding to the position of each component stored in the storage unit. The second drive motor 82 is reversely rotated before the leading edge reaches the nip position of the conveying roller pair 51, and after a predetermined time has elapsed after the leading edge reaches the conveying roller pair 51, the second driving motor 82 is turned on. Rotate forward. The recording medium 14 is stopped by the reversely rotated transport roller pair 51 and subjected to registration correction, and then transported in the transport direction 38 by the forward rotation of the second drive motor 82.

  The control unit 18 monitors the position of the leading end of the recording medium 14 in the transport direction 38 from the output change of the sensor 91 and the number of output changes of the first encoder 92, and the leading end of the recording medium 14 is a predetermined position below the recording head 42. If it is determined that the position has been reached, the second drive motor 82 is stopped. Next, the control unit 18 supplies power to the piezoelectric element 44 to cause the recording head 42 to eject ink droplets and move the carriage 41 to print one line with a predetermined line feed width. The line feed width is determined by which nozzle 45 (FIG. 3) the control unit 18 selects. The maximum line feed width corresponds to the length of the nozzle rows 46 to 49. When the printing of one line is completed, the control unit 18 drives the second drive motor 82 to convey the recording medium 14, and stops the second driving motor 82 when the conveyance amount of the recording medium 14 reaches the line feed width. One line is printed again. As described above, the control unit 18 performs image recording on the recording medium 14 while intermittently transporting the recording medium 14 and performing a line feed.

  In addition, the control unit 18 determines the posture of the movable guide member 70 from the print data and performs the above-described printing operation. In the following description, the rotation of the fourth drive motor 84 in the direction in which the movable guide member 70 is changed in posture from the support posture to the second inclined posture is defined as normal rotation.

  Next, a series of operations related to printing will be described according to the flow of FIG. When the printing instruction is given, the control unit 18 reversely rotates the fourth drive motor 84 by a predetermined amount of rotation to bring the movable guide member 70 into the support posture (S1). The predetermined amount of rotation is set to be equal to or greater than the amount of rotation by which the movable guide member 70 in the second inclined posture changes its posture to the support posture, and is stored as a predetermined value in the storage unit. When the fourth drive motor 84 is reversely rotated by a predetermined amount, the initial posture of the movable guide member 70 is determined as the support posture. Thereafter, the control unit 18 acquires print data (S2). The control unit 18 that has acquired the print data reads the guide drive table stored in the storage unit (S3). The guide drive table will be described later. Next, the control unit 18 selects a nozzle 45 that ejects ink droplets from information such as image information and printing accuracy (speed) included in the print data, and determines a line feed width (S4). Note that steps S1 to S3 may be executed in parallel.

  Next, based on the type information of the recording medium 14 included in the print data, the control unit 18 determines whether the recording medium 14 to be used is a recording medium 14 with high rigidity such as cardboard or glossy paper, or plain paper or the like. It is determined whether the recording medium 14 has low rigidity (S5). Note that this information may be input by the user at the time of a print command. When determining that the recording medium 14 has high rigidity (S5, Y), the control unit 18 drives the first drive motor 81 to start feeding (S11). That is, image recording is started with the movable guide member 70 in the support posture.

  When the control unit 18 determines that the rigidity of the recording medium 14 is low (S5, N), the leading edge of the recording medium 14 reaches the discharge roller pair 54 from the line feed width determined in step S4 and the use nozzle 45. Estimate the number of line breaks required. The control unit 18 determines the amount of ink to be ejected to the recording medium 14 until line breaks are executed for the estimated number of line breaks (S6). Specifically, the control unit 18 determines the type of ink droplet and the number of ejection of each ink droplet within the estimated number of line breaks from the print data, and multiplies the determined type of ink droplet by the number of ejection of the ink droplet. This determines the ink amount. Note that the number of line breaks for determining the ink amount may be the number set in advance and stored in the storage unit. That is, the ink amount may be determined based on print data in a preset area. Hereinafter, the ink amount at the estimated number of line breaks will be referred to as a determined ejection amount. The determined ejection amount corresponds to ink amount information.

  The guide drive table read in step S3 is a table showing the rotation amount of the fourth drive motor 84 corresponding to the determined discharge amount, and has a first threshold value and a second threshold value that determine the range of the determined discharge amount. ing. In the present embodiment, the first threshold value is set to a value smaller than the second threshold value. The control unit 18 compares the determined ejection amount determined in step S6 with the first threshold value (S7). When the control unit 18 determines that the determined discharge amount is equal to or greater than the first threshold value (S7, Y), the control unit 18 rotates the fourth drive motor 84 in the forward direction by the rotation amount at which the movable guide member 70 is in the second forward tilt posture (S8). ). The guide drive table has a predetermined value corresponding to the rotation amount at which the movable guide member 70 is in the second forward tilt posture. When determining that the determined discharge amount is smaller than the first threshold value (S7, N), the control unit 18 compares the determined discharge amount with the second threshold value (S9). When the control unit 18 determines that the determined discharge amount is equal to or greater than the second threshold value (S9, Y), the control unit 18 rotates the fourth drive motor 84 in the forward direction with the rotation amount at which the movable guide member 70 is in the first forward tilt posture (S10). ). The guide drive table has a predetermined value corresponding to the rotation amount at which the movable guide member 70 is in the first forward tilt posture. If the controller 18 determines that the determined ejection amount is smaller than the second predetermined value (S9, N), the controller 18 does not drive the fourth drive motor 84. That is, the movable guide member 70 is maintained in the support posture. That is, if the determined discharge amount is greater than or equal to the first threshold, the fourth drive motor 84 is rotated by the amount of rotation that results in the second forward leaning posture, and if the determined discharge amount is greater than or equal to the second threshold and less than the first threshold, The fourth drive motor 84 is rotated by the amount of rotation that results in one forward tilt posture, and the posture of the movable guide member 70 is changed. In the second forward leaning posture, the guide surface 78 is disposed below the first forward leaning posture. That is, the second forward leaning posture has a larger amount of escaping the recording medium 14 than the first forward leaning posture.

  As described above, in Steps S6 to S10, the control unit 18 increases the displacement amount of the movable guide member 70 to change the posture of the movable guide member 70 as the determined discharge amount increases, and the determined discharge amount is less than the second threshold value. If it is smaller, the movable guide member 70 is maintained in the support posture with the displacement amount being zero. That is, the control unit 18 determines the displacement amount of the movable guide member 70 based on the amount of ink ejected to the leading end portion of the recording medium 14. The leading edge is a specific area that is printed before the leading edge of the recording medium 14 in the transport direction 38 reaches the nip position of the discharge roller pair 54. The specific area is determined from the distance in the transport direction 38 from the most upstream nozzle 45 of the used nozzles 45 determined by the print data to the nip position of the discharge roller pair 54 and the line feed width determined by the print data. Can be determined. That is, the number of line breaks is determined until the line feed is executed until the leading edge of the recording medium 14 reaches the nip position of the paper discharge roller pair 54, and the area where printing is completed when the line break is made for the number of line breaks is specified. This is an area. The amount of ink ejected to the specific area is determined based on the print data.

  The control unit 18 feeds the recording medium 14 to the printing start position after Steps S5 to S10 (S11). Whether the recording medium 14 has been transported to the printing start position is determined based on the transport amount of the recording medium 14 detected by the first encoder 92 and the second encoder 93 after the front end of the recording medium 14 is detected by the sensor 91. To be judged. Note that the position of the leading end of the recording medium 14 in the transport direction 38 is always monitored from the outputs of the first encoder 92 and the second encoder 93. After feeding in step S11, the control unit 18 determines whether or not the movable guide member 70 is in the support posture (S12). When the control unit 18 determines that the movable guide member 70 is in the support posture (S12, Y), the recording unit 40 discharges ink droplets for one line (S13). After printing one line, it is determined whether or not data to be printed remains (S14). If it is determined that data to be printed remains (S14, Y), the second drive motor 82 is driven to perform a line feed for a predetermined line feed width (S15). Thereafter, one line is printed by the recording unit 40 in step S13. If it is determined that there is no data to be printed (S14, N), the second drive motor 82 is driven and the recording medium 14 is discharged from the discharge roller pair 54 (S21).

  If the control unit 18 determines in step S12 that the movable guide member 70 is in the first forward tilt posture or the second forward tilt posture (S12, N), the recording unit 40 ejects ink droplets for one line (S16). ). When the ejection of ink droplets is completed, it is determined whether or not data to be printed remains (S17). If it is determined that there is no data to be printed (S17, N), the second drive motor 82 is driven to discharge the recording medium 14 from the paper discharge roller pair 54 (S21). If it is determined that the data to be printed remains (S17, Y), it is determined whether or not the leading end of the recording medium 14 exceeds the nip position of the paper discharge roller pair 54 by the next line feed (S18). The control unit 18 determines whether or not the number of output changes of the first encoder 92 and the second encoder 93 after the leading end of the recording medium 14 exceeds the sensor 91 exceeds a predetermined value stored in the storage unit, and step Based on the line feed width determined in S4, it is determined whether or not the leading end of the recording medium 14 reaches the nip position of the paper discharge roller pair 54 at the next line feed.

  When the control unit 18 determines that the leading edge of the recording medium 14 in the transport direction 38 does not exceed the nip position of the paper discharge roller pair 54 in the next line feed operation (S18, N), it drives the second drive motor 82. A line feed is performed (S20), and then the process returns to step S16 to print one line. When the control unit 18 determines that the leading end of the recording medium 14 in the transport direction 38 exceeds the nip position of the discharge roller pair 54 (S18, Y), the control unit 18 reversely rotates the fourth drive motor 84 to move the movable guide member 70. The support posture is changed from the first forward leaning posture or the second forward leaning posture (S19). Thereafter, the control unit 18 drives the second drive motor 82 to perform a line feed for a predetermined line feed (S20). Thereafter, the process returns to step S16 to print one line.

  In this embodiment, the low-rigidity recording medium 14 from which the amount of ink ejected so that the leading end of the recording medium 14 in the transport direction 38 is bent is the nip position of the discharge roller pair 54 in the transport direction 38. Until reaching the position, the movable guide member 70 in the first forward leaning posture or the second forward leaning posture releases the tip portion downward. When the recording medium 14 reaches the nip position of the paper discharge roller pair 54 at the next line feed, the movable guide member 70 is returned to the support posture before reaching the nip position, thereby moving the movable guide member 70. Between the guide surface 78 and the spur roller 34. The leading end of the recording medium 14 in the transport direction 38 is guided to the nip position of the discharge roller pair 54 by the first guide end portion 74 and the second guide end portion 75 which are the front end portions of the movable guide member 70.

[Effect of this embodiment]
In the present embodiment, when the amount of ink that causes the leading end portion to bend is ejected to the leading end portion in the transport direction 38 of the recording medium 14 with low rigidity such as plain paper, the movable guide member 70 is the first. The forward leaning posture or the second forward leaning posture is set, and the tip portion is released downward. Since the leading end is released downward, the recording medium 14 is prevented from being damaged or clogged due to contact with the spur roller 34 or the discharge roller pair 54. Further, since the movable guide member 70 is returned to the support posture before a line feed is made so that the leading edge of the recording medium 14 reaches the nip position of the discharge roller pair 54, the recording medium 14 is smoothly conveyed.

  Further, since the posture of the movable guide member 70 is changed by a displacement amount corresponding to the amount of ink ejected to the front end portion of the recording medium 14 in the transport direction 38, the ink amount is relatively small and the deflection amount of the recording medium 14 is small. In this case, the movable guide member 70 can be prevented from greatly decreasing. As a result, a change in the distance between the recording medium 14 and the recording head 42 is suppressed, and an image can be recorded at an appropriate distance, so that an image can be recorded with high accuracy.

  Further, since the displacement amount of the movable guide member 70 is determined by the amount of ink ejected to the front end portion of the recording medium 14 in the transport direction 38, the displacement of the movable guide member 70 is determined by the amount of ink ejected to the entire recording medium 14. Image recording can be performed with higher accuracy than when the amount is determined.

  Further, when the movable guide member 70 is returned from the first forward tilt position or the second forward tilt position to the support position, the recording medium 14 is vertically sandwiched between the spur roller 34 and the movable guide member 70, so that the recording medium 14 deflections are corrected. As a result, it is possible to guide the recording medium 14 to the nip position of the discharge roller pair 54 after correcting the deflection of the recording medium 14.

  Further, when an image is recorded on the recording medium 14 with high rigidity such as thick paper or glossy paper, the movable guide member 70 is maintained in the supporting posture with the displacement amount being zero, so that the recording medium 14 with high rigidity is maintained. The accuracy of image recording when recording an image on the recording medium 14 with low rigidity such as plain paper can be improved without reducing the accuracy of image recording when recording an image.

  In addition, since the timing for changing the posture of the movable guide member 70 is determined using the detection mechanism 90 provided for registration correction and line feed, the accuracy of image recording can be improved without providing a new sensor. .

  Further, since the movable guide member 70 is changed from the first forward inclined posture or the second forward inclined posture to the support posture while ink droplets are not ejected (S18 and S19 in FIG. 9), the posture change of the movable guide member 70 is caused. The image is not disturbed.

  Further, since the movable guide member 70 is provided so as to be rotatable, the posture of the movable guide member 70 can be changed with a simple configuration.

  Further, since the shaft protrusion 73 is provided behind the base 71 of the movable guide member 70, the front end portion of the movable guide member 70 can be raised and lowered with a simple configuration. Further, the leading end of the recording medium 14 in the transport direction 38 can be gradually lowered, and as a result, the accuracy of image recording is higher than when the leading end of the recording medium 14 is suddenly lowered.

  In addition to the first guide end portion 74, the second guide end portion 75 is provided on the movable guide member 70, so that the leading end of the recording medium 14 in the transport direction 38 can be more reliably attached to the discharge roller pair 54. It can be guided to the nip position.

  Further, since the second guide surface 77 is provided on the movable guide member 70 in addition to the first guide surface 76, the recording medium 14 can be smoothly guided to the nip position of the paper discharge roller pair 54.

Further, since the amount of displacement of the movable guide member 70 is changed depending on the amount of ink ejected to the recording medium 14, printing is performed by changing the posture of the movable guide portion 70, rather than the configuration in which the movable guide member 70 is always in the second forward inclined posture. Longer time can be suppressed.
[Modification]

  In this embodiment, the example in which the displacement amount of the movable guide member 70 is determined based on the total amount of ink ejected to the specific region has been described. However, the ink ejection amount for each row in the image recording operation of a plurality of rows in the specific region. The amount of displacement can also be determined from the maximum value of. Further, the amount of displacement may be determined by the amount of ink ejected to the entire recording medium 14 instead of the specific area as in the present embodiment, and the deflection of the recording medium 14 may easily affect the accuracy of image recording. The area may be specified experimentally in advance, and the area may be set as the specific area.

  In this embodiment, the example in which the ink droplet is ejected to the nozzle 45 by the piezoelectric element 44 has been described. However, the ink droplet may be ejected by causing a part of the ink in the ink flow path to bump by the heater. .

  In this embodiment, the example in which the leading end position of the recording medium 14 is detected using the detection mechanism 90 has been described. However, even if the position detection of the recording medium 14 is performed using another detection mechanism. Good. For example, the front end of the recording medium 14 in the transport direction 38 using a media sensor provided in the recording unit 40 and capable of detecting the front end of the recording medium 14 transported through the platen 36 and the first encoder 92. The position may be detected. In addition, a dedicated sensor that detects the position of the tip of the recording medium 14 in the transport direction 38 may be provided.

  In the present embodiment, an example in which the spur roller 34 is provided has been described. However, the recording medium is formed by the movable guide member 70 and the second guide member 33 that are not provided with the spur roller 34 and are returned to the support posture. The bending of the recording medium 14 may be corrected by sandwiching 14 between the upper and lower sides.

  Further, in this embodiment, an example has been described in which it is determined whether or not the displacement amount of the movable guide member 70 is zero depending on the type of the recording medium 14. However, the recording medium 14 has a low rigidity such as plain paper. When only the recording medium 14 is used, the displacement amount of the movable guide member 70 may be determined only by the amount of ejected ink.

  In the present embodiment, the configuration in which the posture of the movable guide member 70 is changed by turning is described. However, a configuration in which the posture of the movable guide member 70 is changed by sliding along the vertical direction 7 may be employed. . For example, a guide rail extending along the vertical direction 7 is provided on the frame 19, and a cam belt mechanism is used instead of the fourth drive transmission mechanism 88, so that the movable guide member 70 can slide along the vertical direction 7. The

  Further, in the present embodiment, the configuration (S18 and S19 in FIG. 9) is described in which the movable guide member 70 is returned to the support posture while the recording head 42 is not ejecting ink droplets. However, the image recording is not affected. For example, a configuration in which the movable guide member 70 changes its posture while the recording head 42 ejects ink droplets may be employed. When this configuration is adopted, the posture of the movable guide member 70 can be changed without stopping the printing operation including the line feed and the ejection of ink droplets. Therefore, the time required for image recording due to the posture change of the movable guide member 70 Will not be long.

  In the present embodiment, the configuration in which the posture of the movable guide member 70 is changed while the recording head 42 does not eject ink droplets and the line feed operation is not performed has been described. That is, the posture of the movable guide member 70 is changed in the first period after the ink line is ejected until the ink droplet is ejected and in the second period until the ink line is ejected and the line break starts. In order to prevent a decrease in the accuracy of image recording, it is desirable that the posture of the movable guide member 70 be changed during the first period or the second period. However, if there is no effect on the accuracy of image recording, the movable guide member 70 may be changed in posture during a line feed. When the movable guide member 70 is changed in posture during a line feed, the time required for image recording does not increase due to the posture change of the movable guide member 70.

  In the present embodiment, the example in which the movable guide member 70 is changed in posture by the fourth drive motor 84 has been described. However, even if the movable guide member 70 is changed in posture by the first drive motor 81 or the third drive motor 83. Good. For example, using a one-way clutch, the first rotation shaft 21 is rotated by rotation of the first drive motor 81 in one direction, and the movable guide member 70 is moved from the support posture to the first forward tilt posture by half rotation of the other direction. The posture is changed to the second forward leaning posture, and the movable guide member 70 is changed from the first forward leaning posture or the second forward leaning posture to the supporting posture by the remaining half rotation. The posture of the movable guide member 70 may be changed by the first drive motor 81 or the third drive motor 83 using a known gear switching mechanism or the like. Further, the movable guide member 70 may be changed in posture by pushing the member that changes the posture of the movable guide member 70 with the carriage 41 by using the slide movement of the carriage 41. By using the first drive motor 81, the third drive motor 83, the carriage 41, etc., the number of drive motors can be reduced.

  Further, in the present embodiment, the configuration in which the movable guide member 70 is changed in posture in two stages of the first forward tilt posture and the second forward tilt posture has been described. However, the movable guide member 70 has the second forward tilt posture. The maximum forward tilt posture with the largest amount of displacement may be set so that the posture can be changed in three or more stages between the support posture and the maximum forward tilt posture. When this configuration is adopted, the guide drive table is provided with a threshold value corresponding to the number of postures that the movable guide member 70 can change in posture.

  Further, the movable guide member 70 may be linearly changed in posture. For example, the control unit 18 sets the rotation amount of the fourth drive motor 84 with respect to the determined discharge amount as a function, and forwardly rotates the fourth drive motor 84 by the rotation amount calculated by the function, thereby the movable guide member 70. Change the posture linearly. Since the movable guide member 70 rotates with a more suitable amount of displacement, the accuracy of image recording can be improved.

  Further, in the present embodiment, the configuration in which the movable guide member 70 is set to the support posture before starting feeding has been described. However, the movable guide member 70 has the tip of the recording medium 14 at the base 71 of the movable guide member 70. The posture may be changed to the support posture before reaching the rear end.

  In this embodiment, the example in which the support posture is the initial posture of the movable guide member 70 has been described. However, the second forward tilt posture may be the initial posture.

  In the present embodiment, the example in which the control unit 18 controls the posture of the movable guide member 70 by controlling the rotation amount of the second drive motor 82 has been described. However, the control unit 18 detects the posture of the movable guide member 70. A sensor may be provided. When the control unit 18 detects that the movable guide member 70 is in a desired posture based on an input from the sensor, the control unit 18 stops driving the fourth drive motor 84.

  In the present embodiment, the example in which the movable guide member 70 is maintained in each posture by the frictional force generated between the frame 19 and the platen 36 has been described. However, the peripheral surface of the shaft protrusion 73 and the shaft protrusion 73 are described. The receiving frame 19 may be maintained in each posture by being provided with ribs. When one rib passes over the other rib by the torque of the fourth drive motor 84 and the fourth drive motor 84 is not driven, the movable guide member 70 is maintained in each posture by the ribs contacting each other.

  In the present embodiment, the example in which the power supply to the piezoelectric element 44 and the drive of the fourth drive rotor 84 are controlled by the single control unit 18 has been described. However, the power supply to the piezoelectric element 44 by the two control units is described. The driving of the fourth driving roller 84 may be individually controlled.

  In the present embodiment, the area to be printed before the line feed operation that reaches the nip position of the paper discharge roller pair 54 is set as the specific area, but the front end of the recording medium 14 is simply the nip of the paper discharge roller pair 54. The area from the most upstream end of the print area to the leading end when the position is reached may be determined as the specific area of the recording medium 14. In this case, unlike the present embodiment, the distance in the transport direction 38 from the most upstream nozzle 45 to the nip position of the paper discharge roller pair 54 among the used nozzles 45 determined from the print data is not considered without considering the line feed width. The area from the tip of the recording medium 14 to the position corresponding to the distance is calculated as the specific area.

DESCRIPTION OF SYMBOLS 10 ... Inkjet recording device 18 ... Control part 34 ... Spur roller (contact member)
36 ... Platen 42 ... Recording head 51 ... Pair of transport rollers (first transport mechanism)
54 ... Discharge roller pair (second transport mechanism)
70 ... movable guide member (guide member)
73 ... Shaft projection (rotating shaft)
74... First guide end 75... Second guide end 76... First guide surface 77.

Claims (12)

A first transport mechanism for transporting a recording medium in a transport direction;
A platen disposed downstream of the first transport mechanism in the transport direction and supporting a recording medium to be transported;
A second transport mechanism that is disposed downstream of the platen in the transport direction and transports the recording medium in the transport direction by a driving roller and a driven roller facing the driving roller;
A recording head which is disposed above the platen and which discharges ink droplets toward a recording medium based on print data;
The recording medium is disposed between the nip position between the drive roller and the driven roller of the second transport mechanism and the platen in the transport direction, and the recording medium transported by the first transport mechanism is moved to the nip position. A guide member capable of changing its posture to a plurality of second postures in which the first posture to be guided and the leading edge of the recording medium in the transport direction are positioned below the nip position;
A drive unit that changes the posture of the guide member;
A control unit that controls the driving of the driving unit to change the posture of the guide member,
The control unit determines an amount of displacement of the guide member from the first posture based on the print data, and controls the drive of the driving unit to bring the guide member into a posture according to the amount of displacement. Recording device.   The inkjet recording apparatus according to claim 1, wherein the control unit determines the amount of displacement based on ink amount information that is information on an amount of ink ejected to a recording medium in the print data.   The ink jet recording apparatus according to claim 2, wherein the control unit increases the displacement amount as the ink amount increases.   The control unit determines whether or not the displacement amount is zero based on the type information of the recording medium, and determines that the displacement amount is not zero, and determines the displacement amount based on the print data. The ink jet recording apparatus according to claim 1, wherein the ink jet recording apparatus is used. A first detector that is provided upstream of the guide member in the transport direction and detects a leading edge of the transported recording medium;
A second detection unit for detecting the conveyance amount of the recording medium,
The control unit controls driving of the driving unit based on detection results of the first detection unit and the second detection unit, and the control unit performs the above-described operation until the leading end of the recording medium in the transport direction reaches the guide member. 5. The ink jet recording apparatus according to claim 1, wherein the guide member is set in a posture corresponding to the amount of displacement, and the guide member is set in the first posture before the tip reaches the nip position. A contact member disposed above the guide member;
The control unit controls driving of the driving unit, and after the leading end of the recording medium in the transport direction exceeds the contact member, changes the posture of the guide member from the second posture to the first posture. The ink jet recording apparatus according to claim 5, wherein the recording medium is brought into contact with the contact member.   The control unit determines, based on the print data, a region in which ink droplets are ejected by the recording head before a line feed operation in which the leading end of the recording medium in the transport direction reaches the nip position. The inkjet recording apparatus according to claim 1, wherein the displacement amount is determined from information corresponding to an image recorded in the specific area in the print data.   The inkjet recording apparatus according to claim 7, wherein the control unit determines the displacement amount based on information on a total amount of ink droplets ejected to the specific area in the print data.   The control unit controls the driving of the first transport mechanism and the ejection of ink droplets on the recording head, and stops the transportation of the recording medium on the platen and then ejects ink droplets on the recording head. And a line feed operation for transporting the recording medium by a predetermined transport amount determined from the print data, and based on the print data, a plurality of lines in the specific area are 8. The ink jet recording apparatus according to claim 7, wherein a maximum amount of ink discharge amounts for each row in the image recording operation is estimated, and the displacement amount is determined from the estimated maximum amount. The guide member is provided so as to be rotatable around a rotation shaft disposed on the upstream side in the conveyance direction of the guide member,
10. The ink jet recording apparatus according to claim 1, wherein the driving unit rotates the guide member with a tip on the downstream side in the conveyance direction as a turning tip. 11. At least one of the driving roller and the driven roller of the second transport mechanism is a plurality of the rollers arranged in parallel along the rotation axis direction.
In the first posture, the guide member is
A first guide end facing the nip position in the transport direction;
11. A second guide end provided between adjacent rollers in the rotation axis direction and extending to the downstream side in the transport direction from the first guide end. An ink jet recording apparatus according to claim 1. In the first posture, the guide member is
A first guide surface along the conveying direction;
The second guide surface, which is disposed on the downstream side in the transport direction with respect to the first guide surface and is inclined upward toward the downstream side in the transport direction. 2. An ink jet recording apparatus according to 1.

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