JP6011195B2 - Inkjet recording device - Google Patents

Description

  The present invention relates to an inkjet recording apparatus that can easily remove a recording medium jammed in a conveyance path.

  Conventionally, a recording medium (hereinafter also referred to as “paper”) sandwiched by a clamping means by separating a conveyance roller and a pinch roller (hereinafter also referred to as “nipping means”) pressed by the conveyance roller. There is an image recording apparatus that can eliminate the above. For example, Patent Document 1 discloses a state in which a plurality of gears constituting a drive transmission switching mechanism are engaged, a state in which the driving force of a motor is transmitted to a paper feed roller, and a contact / separation mechanism in which the driving force of the motor separates the clamping unit. An image recording apparatus is disclosed that records an image while switching between the states transmitted and received.

  More specifically, in Patent Document 1, after the second gear included in the drive transmission switching mechanism is moved from the first position to the second position, at least one forward drive and reverse drive are alternately performed on the motor. By executing the motor once, the driving force of the motor can be transmitted to the contact / separation mechanism, and after the second gear is moved from the second position to the first position, the motor is alternately driven forward and reverse at least once. Thus, a configuration is disclosed in which the driving force of the motor can be transmitted to the sheet feeding roller.

JP 2012-148529 A

  However, the image recording apparatus described in Patent Document 1 executes the following series of operations for all sheets on which image recording is performed. That is, image recording is performed after the second gear is moved to the second position after the paper reaches the clamping means, and the second gear is moved to the first position before feeding the next paper. Each time the second gear moves, the motor alternately performs forward rotation and reverse rotation at least once. For this reason, for example, when it is desired to continuously record images on a plurality of sheets with an emphasis on speed, it is difficult to improve the throughput of image recording.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an ink jet recording apparatus capable of suppressing a decrease in image recording throughput and easily removing a recording medium jammed in a conveyance path. It is to provide.

(1) An inkjet recording apparatus according to an aspect of the present invention includes a feeding unit that feeds a recording medium to a conveyance path, and a plurality of the recording media that are fed to the conveyance path by the feeding unit. A transport unit sandwiched between the transport rollers and transported downstream in the transport direction, and disposed downstream of the transport unit and moved in a scanning direction orthogonal to the transport direction, and ink is directed toward the recording medium A recording unit that records an image by discharging, and a contact / separation mechanism that changes the posture of the transport unit between a first posture in which the plurality of rollers contact each other and a second posture in which the plurality of rollers are separated from each other. A first motor for moving the recording unit in the scanning direction, a second motor for driving the feeding unit and the contact / separation mechanism, and a plurality of units by moving the recording unit to a predetermined switching position. The meshing state of the gear A switching mechanism capable of switching between a first state in which the driving force of the motor is transmitted to the feeding unit and a second state in which the driving force of the second motor is transmitted to the contact / separation mechanism, the first motor, and the And a control unit that controls driving of the second motor. The control unit drives the first motor on the condition that the amount of ink ejected from the recording unit to the recording medium exceeds a threshold value and the recording medium is held by the transport unit. Then, after the recording unit is moved to the switching position, the switching mechanism is switched from the first state to the second state, and then the forward rotation driving and the reverse rotation driving are alternately performed at least once on the second motor. The separation preparation operation is executed.

  According to the above configuration, by switching the switching mechanism to the second state in advance, when a paper jam (hereinafter referred to as “JAM”) occurs, the plurality of rollers constituting the transport unit are separated. Can do. As a result, JAM processing can be easily performed. Further, since the state of the switching mechanism is switched only when the amount of ink ejected to the recording medium exceeds the threshold (that is, the probability of occurrence of JAM due to ink landed on the recording medium is high), the state of the switching mechanism is changed. A reduction in throughput due to switching can be reduced.

(2) Preferably, the ink jet recording apparatus further includes a discharge unit that is disposed on the downstream side of the recording unit, and that holds the recording medium and discharges the recording medium to the downstream side. Then, the control unit performs the separation preparation operation before the leading end of the recording medium reaches the discharge unit.

  Since there is a low probability that JAM will occur after the leading edge of the recording medium has passed through the discharge section, a decrease in throughput can be further suppressed by not performing the separation preparation operation after the leading edge of the recording medium has reached the discharge section.

(3) Preferably, the control unit drives the first motor and moves the recording unit to the switching position by driving the first motor on the condition that the leading end of the recording medium has passed the discharge unit. After the switching mechanism is switched from the second state to the first state, a feeding preparation operation for causing the second motor to alternately perform forward rotation and reverse rotation at least once is executed.

  Since there is a low probability that JAM will occur after the leading edge of the recording medium passes through the discharge section, the state of the switching mechanism can be switched by executing a paper feeding preparation operation before the image recording on the recording medium is completed. The throughput reduction due to the is minimized.

(4) Preferably, the control unit drives the first motor to move the recording unit to the switching position on the condition that the rear end of the recording medium has passed the transport unit. After the switching mechanism is switched from the second state to the first state, a feeding preparation operation for causing the second motor to alternately perform forward rotation and reverse rotation at least once is executed.

  Since it is not necessary to separate the rollers constituting the conveyance unit after the trailing end of the recording medium has passed through the conveyance unit, by performing the paper feeding preparation operation before the image recording on the recording medium is completed. A decrease in throughput due to the switching of the state of the switching mechanism is minimized.

(5) As an example, when the resolution of an image recorded on the recording medium exceeds a reference resolution, the control unit determines that the amount of ink ejected from the recording unit to the recording medium exceeds a threshold value. Judging and performing the above-mentioned separation preparation operation.

(6) As another example, the recording unit performs image recording on the recording medium for each predetermined width in the transport direction, and the control unit performs the image recording performed immediately before. When the amount of ink ejected on the image recording surface of a predetermined width exceeds a reference amount, the separation preparation operation is determined by determining that the amount of ink ejected from the recording unit to the recording medium exceeds a threshold value. Execute.

(7) As yet another example, the recording unit records an image on the recording medium for each predetermined width in the transport direction, and the control unit performs the image recording next. When the amount of ink ejected to the image recording surface of a predetermined width exceeds a reference amount, the separation preparation operation is performed by determining that the amount of ink ejected from the recording unit to the recording medium exceeds a threshold value. Execute.

  According to any of the above judgment criteria, it is possible to estimate the occurrence probability of JAM caused by ink landed on the recording medium. As a result, since the separation preparation operation can be executed only when the probability of occurrence of JAM is high, a decrease in throughput can be suppressed.

(8) Preferably, after the separation preparation operation is completed, the control unit causes the recording head to start image recording on an image recording surface of the next predetermined width.

  According to the above configuration, since the image recording is started after the preparation for separating the rollers constituting the conveyance unit is completely completed, the JAM processing that occurs during the image recording is facilitated.

(9) An inkjet recording apparatus according to another aspect of the present invention includes a feeding unit that feeds a recording medium to a conveyance path, and the recording medium that is fed to the conveyance path by the feeding unit. A transport unit sandwiched between a plurality of rollers and transported to the downstream side in the transport direction; and disposed downstream of the transport unit, moves in a scanning direction orthogonal to the transport direction, and moves toward the recording medium A contact / separation mechanism that changes the posture of the recording unit that records an image by discharging the ink and the transport unit into a first posture in which the plurality of rollers are in contact with each other and a second posture in which the plurality of rollers are separated from each other A first motor that moves the recording unit in the scanning direction, a second motor that drives the feeding unit and the contact / separation mechanism, and the recording unit is moved to a predetermined switching position. The meshing state of the second gear A switching mechanism capable of switching between a first state in which the driving force of the motor is transmitted to the feeding portion and a second state in which the driving force of the second motor is transmitted to the contact / separation mechanism, the first motor, And a control unit that controls driving of the second motor. The control unit determines that the direction of the fibers constituting the recording medium and the transport direction intersect, and the first motor is controlled on condition that the recording medium is sandwiched by the transport unit. After driving and moving the recording unit to the switching position, the meshing state of the switching mechanism is switched from the first state to the second state, and then the forward rotation drive and the reverse rotation drive are alternately performed on the second motor. A separation preparation operation to be executed at least once is executed.

  As in the above configuration, the occurrence probability of JAM can be estimated based on the relationship between the direction of the fibers of the recording medium and the conveyance direction instead of the ink ejection amount. However, the estimation of the occurrence probability of JAM based on the ink ejection amount and the estimation of the occurrence probability of JAM based on the direction of the fibers of the recording medium are not contradictory. Good.

(10) An inkjet recording apparatus according to still another embodiment of the present invention includes a feeding unit that feeds a recording medium to a conveyance path, and the recording medium that is fed to the conveyance path by the feeding unit. A transport unit that is sandwiched between a plurality of rollers and transported downstream in the transport direction, and is disposed on the downstream side of the transport unit and moves in a scanning direction orthogonal to the transport direction, toward the recording medium The contact portion that changes the posture of the recording portion that records an image by ejecting ink and the transport portion into a first posture in which the plurality of rollers are in contact with each other and a second posture in which the plurality of rollers are separated from each other. A mechanism, a first motor that moves the recording unit in the scanning direction, a second motor that drives the feeding unit and the contact / separation mechanism, and the recording unit moves to one end in the scanning direction. The meshing state of a plurality of gears A switching mechanism capable of switching from a first state in which the driving force of the second motor is transmitted to the feeding unit to a second state in which the driving force of the second motor is transmitted to the contact / separation mechanism, and the first motor And a controller for controlling the driving of the second motor. The controller controls the first motor on the condition that the recording medium is jammed in the conveyance path while the recording unit is moving from one end to the other end in the scanning direction. The recording unit is moved to one end in the scanning direction, and the second motor is caused to alternately perform forward rotation and reverse rotation at least once, and the second motor is driven to perform the contact / separation. The posture of the mechanism is changed from the first posture to the second posture.

  According to the above configuration, even if the separation preparation operation is not executed in advance, the rollers constituting the transport unit can be separated after the occurrence of JAM. As a result, a decrease in throughput caused by switching the state of the switching mechanism is minimized, and JAM processing is facilitated.

  According to the present invention, it is possible to obtain an ink jet recording apparatus that can suppress a decrease in throughput of image recording and can easily remove a recording medium jammed in a conveyance path.

FIG. 1 is a perspective view of the multifunction machine 10. FIG. 2 is a longitudinal sectional view schematically showing the internal structure of the printer unit 11. FIG. 3 is a front view schematically showing the drive transmission switching mechanism 50, the transport unit 59, and the contact / separation mechanism 90. 4A and 4B are diagrams for explaining the operation of the drive transmission switching mechanism 50 and the contact / separation mechanism 90. FIG. 4A is a plan view of the switching lever 55, and FIG. A left side view schematically showing the planet gear 157 of the second transmission unit 57 in the case of the first posture is shown, and (C) of the contact / separation mechanism 90 in the case where the transport unit 59 is in the first posture. A left side view schematically showing the eccentric cam 160 is shown, and (D) is a left side view schematically showing the planet gear 157 of the second transmission portion 57 when the transport portion 59 is in the second posture. FIG. 9E shows a left side view schematically showing the eccentric cam 160 of the contact / separation mechanism 90 when the transport section 59 is in the second posture. FIG. 5 is a right side view schematically showing the first transmission unit 27 and the third transmission unit 74. FIG. 6 is a block diagram illustrating a configuration of the control unit 130. FIG. 7 is a flowchart for explaining processing by the control unit 130.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. 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 changed as appropriate without departing from the gist of the present invention. In the following description, the vertical direction 7 is defined with reference to the state in which the multifunction machine 10 is installed (the state in FIG. 1), and the side on which the opening 13 is provided is the front side (front side). A front-rear direction 8 is defined, and a left-right direction 9 is defined when the multifunction machine 10 is viewed from the front side (front side).

[Multifunction machine 10]
As shown in FIG. 1, a multifunction machine 10 which is an example of an image recording apparatus of the present invention is formed in a substantially thin rectangular parallelepiped, and an ink jet recording type printer unit 11 (the ink jet recording apparatus of the present invention is formed below). An example) is provided. The multifunction machine 10 has various functions such as a facsimile function and a print function. The print function has a double-sided image recording function for recording images on both sides of the recording paper. In this embodiment, the multifunction device 10 has a double-sided image recording function, but the multifunction device 10 may have only a single-sided image recording function.

  The printer unit 11 has a housing 14 having an opening 13 formed in the front. In addition, a paper feed tray 20 and a paper discharge tray 21 (see FIG. 2) on which recording papers of various sizes can be placed can be inserted and removed in the front-rear direction 8 from the opening 13.

  An operation panel 17 is provided at the upper front of the multifunction machine 10. The operation panel 17 is a device for operating the multifunction machine 10. The multifunction machine 10 operates based on operation input from a device connected through the operation panel 17 or a communication line (whether wired or wireless).

  As shown in FIG. 2, the printer unit 11 includes a sheet feeding unit 15 that picks up and feeds recording paper from the sheet feeding tray 20 (an example of the feeding unit of the present invention), and a sheet feeding tray 20. A recording unit 24 (an example of the recording unit of the present invention) of an ink jet recording system that discharges ink droplets onto a recording sheet fed by the sheet feeding unit 15 and records an image on the recording sheet; Part 41 and the like.

[Paper Feeder 15]
As shown in FIG. 2, the paper feed unit 15 is provided above the paper feed tray 20 and below the recording unit 24. The sheet feeding unit 15 includes a feeding roller 25, a sheet feeding arm 26, and a first transmission unit 27 (see FIG. 3). The feed roller 25 is pivotally supported at the tip of the paper feed arm 26. The paper feed arm 26 rotates in the direction of an arrow 29 about a shaft 28 provided at the base end. As a result, the feed roller 25 can be brought into contact with and separated from the paper feed tray 20. That is, the feeding roller 25 can abut on the recording paper placed on the paper feed tray 20.

  The feeding roller 25 is rotated by a driving force of a sheet feeding motor 70 (an example of a second motor of the present invention, see FIGS. 3 and 6) transmitted by a first transmission unit 27 described later. That is, the paper feeding motor 70 applies a driving force to the feeding roller 25. The paper feeding motor 70 also applies a driving force to a contact / separation mechanism 90 described later (see FIG. 3 as an example of the contact / separation mechanism of the present invention). The feeding roller 25 feeds the recording sheet to a curved path 65A described below in a state where the recording sheet is in contact with the uppermost recording sheet among the recording sheets stacked on the sheet feeding tray 20.

[First transport path 65]
As shown in FIG. 2, a first conveyance path 65 is formed in the printer unit 11 from the front end (rear end) of the paper feed tray 20 to the paper discharge tray 21 through the recording unit 24. Yes. The first transport path 65 includes a curved path 65A formed between the leading end of the paper feed tray 20 and the first transport roller 60, and a paper discharge formed between the first transport roller 60 and the paper discharge tray 21. It is divided into a road 65B.

  The curved path 65 </ b> A is a curved path extending from the vicinity of the upper end of the separation inclined portion 22 provided in the paper feed tray 20 to the recording unit 24. The curved path 65 </ b> A is generally formed in an arc shape centering on the inside of the printer unit 11. The recording sheet fed from the sheet feeding tray 20 by the feeding roller 25 is first conveyed while being curved along the first conveyance direction (the direction of the arrow attached to the dashed line in FIG. 2) along the curved path 65A. The roller 60 and the pinch roller 61 guide the recording paper to the nipping position. The curved path 65A is formed by an outer guide member 18 and an inner guide member 19 that face each other at a predetermined interval.

  The paper discharge path 65 </ b> B is a linear path that extends from the position where the recording paper is held by the first transport roller 60 and the pinch roller 61 to the paper discharge tray 21. The recording paper is guided along the first conveyance direction along the paper discharge path 65B. In the place where the recording unit 24 is provided, a part of the paper discharge path 65B is formed by a platen 42 capable of supporting the recording paper. Further, the paper discharge path 65B is formed by an upper guide member 82 and a lower guide member 83 that face each other at a predetermined interval at a location where the recording unit 24 is not provided.

  A branching portion 36 exists downstream of the recording unit 24 in the first conveyance direction and downstream of the second conveyance roller 62 described later in the first conveyance direction. The recording paper transported through the paper discharge path 65B is switched back downstream of the branching section 36 during double-sided image recording, and transported toward a second transport path 67 described later.

[Recording unit 24]
As shown in FIG. 2, the recording unit 24 is provided on the downstream side of the first transport roller 60 in the first transport direction in the paper discharge path 65B. The recording unit 24 is mounted with a recording head 38 and intersects (specifically, orthogonally) the first transport direction and is in the left-right direction 9 along the image recording surface of the recording paper supported by the platen 42 (present invention). The carriage 40 is capable of reciprocating in the scanning direction of FIG.

  The carriage 40 is supported by, for example, two guide rails (not shown) extending in the left-right direction 9 inside the printer unit 11. The two guide rails are arranged at a predetermined interval in the front-rear direction 8. The carriage 40 is disposed so as to straddle the two guide rails. As a result, the carriage 40 can slide in the left-right direction 9 on the two guide rails. A belt drive mechanism (not shown) is disposed on the upper surface of the guide rail. The belt constituting the belt driving mechanism is connected to the carriage 40. When the driving force is transmitted from the carriage driving motor 103 (an example of the first motor of the present invention, see FIG. 6) to the belt driving mechanism, the carriage 40 is slid in the left-right direction 9. That is, the carriage drive motor 103 applies a driving force to the carriage 40.

  As shown in FIG. 2, the recording head 38 is provided in the carriage 40 so that the recording head 38 faces the platen 42. The recording head 38 is supplied with inks of cyan (C), magenta (M), yellow (Y), and black (Bk) from an ink cartridge (not shown) through an ink tube (not shown). A plurality of nozzles (not shown) are formed on the nozzle surface on the lower surface side of the recording head 38. Each nozzle is provided for each color ink of CMYBk. Each color ink is ejected from each nozzle as a fine ink droplet.

  The carriage 40 starts to reciprocate in the left-right direction 9 when the recording paper reaches the cueing position 33 below the recording head 38. As a result, the recording head 38 is scanned in the left-right direction 9 with respect to the recording paper conveyed on the platen 42 provided below the recording unit 24. The recording head 38 ejects ink droplets onto the recording paper. As a result, an image is recorded on the upper surface (that is, the image recording surface) of the recording paper. The cue position 33 is the position of the leading edge of the recording paper at the start of image recording. Further, the cueing position 33 is, for example, the position of the downstream end in the first transport direction in the area where the nozzles are arranged in the recording head 38.

[Conveying rollers 45, 60, 62]
As shown in FIG. 2, a transport unit 59 (an example of the transport unit of the present invention) composed of the first transport roller 60 and the pinch rollers 61 (an example of a plurality of rollers of the present invention) is a first transport path 65. 2, the outer guide member 18 and the inner guide member 19 are provided between the recording unit 24. The pinch roller 61 is disposed below the first transport roller 60 and is pressed against the roller surface of the first transport roller 60 by an elastic member such as a spring (not shown). The first conveying roller 60 and the pinch roller 61 sandwich the recording sheet conveyed through the curved path 65A by the feeding roller 25 and convey it in the first conveying direction along the paper discharge path 65B. As a result, the recording sheet is sent onto the platen 42.

  A discharge section 64 (an example of the discharge section of the present invention) configured by the second transport roller 62 and the spur 63 is disposed between the recording section 24 and the upper guide member 82 and the lower guide member 83 in the discharge path 65B. Is provided. The spur 63 is disposed above the second conveyance roller 62 and is pressed against the roller surface of the second conveyance roller 62 by an elastic member such as a spring (not shown). The second conveyance roller 62 and the spur 63 sandwich the recording sheet on which the image is recorded by the recording unit 24 and convey the recording sheet downstream in the first conveyance direction.

  Each of the transport rollers 60 and 62 is rotated by a rotational driving force transmitted from the transport motor 71 via a drive transmission mechanism (not shown). That is, the transport motor 71 applies a driving force to the transport rollers 60 and 62. The drive transmission mechanism is composed of a planetary gear or the like. Accordingly, the drive transmission mechanism rotates the transport rollers 60 and 62 in one rotation direction regardless of whether the transport motor 71 is rotated in the normal rotation direction or the reverse rotation direction. Thereby, the recording sheet is conveyed in the first conveying direction.

  The third transport roller 45 and the spur 46 are provided on the downstream side in the first transport direction from the discharge unit 64 in the paper discharge path 65B. The spur 46 is disposed above the third transport roller 45 and is pressed against the roller surface of the third transport roller 45 by an elastic member such as a spring (not shown).

  The third transport roller 45 is forwardly or reversely rotated by transmitting a driving force in the forward / reverse direction from the transport motor 71 via a drive transmission mechanism (not shown). For example, when single-sided recording is performed, the third transport roller 45 is rotated forward. As a result, the recording paper is sandwiched between the third transport roller 45 and the spur 46 and transported downstream in the first transport direction, and is discharged onto the paper discharge tray 21. On the other hand, when double-sided recording is performed, the rotation direction of the third conveyance roller 45 is switched from normal rotation to reverse rotation with the third conveyance roller 45 and the spur 46 sandwiching the trailing edge of the recording paper. Thereby, the recording sheet is conveyed in the direction opposite to the first conveyance direction, and is conveyed toward the second conveyance path 67 described later by the path switching unit 41 described below.

[Route switching unit 41]
As shown in FIG. 2, the path switching unit 41 is disposed on the downstream side in the first conveyance direction with respect to the second conveyance roller 62 and on the upstream side in the first conveyance direction with respect to the branching portion 36 in the paper discharge path 65B. Has been. The path switching unit 41 includes auxiliary rollers 47 and 48, a flap 49, and a shaft 87.

  The shaft 87 of the path switching unit 41 is provided on the frame of the printer unit 11. The flap 49 extends from the shaft 87 to the downstream side in the first conveying direction and is pivotally supported by the shaft 87 so as to be rotatable. The auxiliary roller 47 and the auxiliary roller 48 are pivotally supported by the flap 49. In addition, the roller surfaces of the auxiliary rollers 47 and 48 are formed in a spur shape like the spur 63 and the spur 46.

  The flap 49 is configured such that its posture can be changed, and a discharge posture (posture indicated by a broken line in FIG. 2) positioned above the lower guide member 83 and an extended end portion 49 </ b> A below the branch portion 36. It rotates between a reverse posture (posture indicated by a solid line in FIG. 2) entering the position. The flap 49 is in an inverted posture due to its own weight in a normal state, and is rotated to change its posture to the discharge posture by being lifted by the recording paper conveyed through the paper discharge path 65B. Further, when the trailing edge of the recording sheet passes through the auxiliary roller 47, the flap 49 rotates by its own weight and changes its posture from the discharge posture to the reverse posture. In this state, when the third conveyance roller 45 continues to rotate normally, the recording sheet is discharged to the discharge tray 21. On the other hand, when the rotation direction of the third conveyance roller 45 is switched from normal rotation to reverse rotation, the recording paper is conveyed toward the second conveyance path 67. The flap 49 may be configured to be rotated by a motor or the like.

[Second transport path 67]
As shown in FIG. 2, the second conveyance path 67 is branched from the branching section 36, passes below the recording section 24 and above the sheet feeding section 15, and more than the recording section 24 in the first conveyance path 65. This is a path extending so as to merge with the curved path 65A at the upstream merge section 37 in the first transport direction. The recording paper is guided in the second transport direction in the second transport path 67. Here, the second transport direction is the direction of the second transport path 67 from the branching section 36 to the joining section 37, and indicates the direction indicated by the two-dot chain line with an arrow in FIG. The second transport path 67 is formed by the second guide member 32 on the upper side and is formed by the first guide member 31 on the lower side.

[Fourth transport roller 68]
As shown in FIG. 2, the fourth conveyance roller 68 and the driven roller 69 are provided in the second conveyance path 67. The fourth transport roller 68 is disposed below the driven roller 69 and at a position facing the driven roller 69 in the second transport path 67. The fourth conveying roller 68 is rotated by the driving force of the paper feeding motor 70 (see FIG. 6) transmitted by a third transmission unit 74 described later. Thus, when the recording sheet conveyed to the second conveying path 67 by the third conveying roller 45 is sandwiched between the fourth conveying roller 68 and the driven roller 69, the fourth conveying roller 68 holds the recording sheet. It is conveyed along the second conveyance path 67 in the second conveyance direction. As a result, the recording sheet is sent to the curved path 65 </ b> A via the junction 37.

[Drive transmission switching mechanism 50]
As shown in FIG. 3, the printer unit 11 is provided with a drive transmission switching mechanism 50 (an example of the switching mechanism of the present invention). The drive transmission switching mechanism 50 is composed of a plurality of gears, and a gear feeding preparation state in which the driving force of the paper feeding motor 70 is transmitted to the feeding roller 25 (the first of the present invention). An example of a state) and a separation preparation state (an example of a second state of the present invention) in which the driving force of the paper feeding motor 70 is transmitted to the contact / separation mechanism 90. The drive transmission switching mechanism 50 switches between the paper feeding preparation state and the separation preparation state when the carriage 40 moves to the home position (an example of the switching position of the present invention). That is, the drive transmission switching mechanism 50 selectively transmits the driving force of the paper feed motor 70 to the feed roller 25 or a contact / separation mechanism 90 described later based on the movement of the carriage 40, as will be described in detail below. Switch to.

  Specifically, the drive transmission switching mechanism 50 includes a first gear 51, a second gear 52, a third gear 53, a fourth gear 54 (an example of the fourth gear of the present invention), a switching lever 55, a coil spring 56A, 56B, the 1st transmission part 27, the 2nd transmission part 57, and the 3rd transmission part 74 (refer FIG. 5).

  The first gear 51 is pivotally supported on the shaft 104 of the paper feed motor 70 protruding in the left-right direction 9 from the paper feed motor 70. As a result, the first gear 51 is driven and transmitted from the paper feed motor 70 and rotated about the left-right direction 9 as an axial direction.

  The second gear 52 is meshed with the first gear 51 with the left-right direction 9 as the axial direction. The second gear 52 is at least a first position (position of the second gear 52 shown in FIG. 3A) and a second position (FIG. 3) along the left-right direction 9 while maintaining meshing with the first gear 51. 3 (B) and the position of the second gear 52 shown in (C). A coil spring 56A is attached to one surface of the second gear 52 in the thrust direction (the left surface in the present embodiment). The coil spring 56 </ b> A is disposed along the axial direction of the second gear 52, one end is attached to the left surface of the second gear 52, and the other end is fixed to a fixed surface such as the frame 105 </ b> A of the printer unit 11. It is attached. Accordingly, the second gear 52 is urged to the right side by the coil spring 56A, that is, from the first position to the second position. A contact portion 108 of a switching lever 55 described later is in contact with the other surface (the right surface in the present embodiment) in the thrust direction of the second gear 52. When the second gear 52 is pushed by the contact portion 108 of the switching lever 55, it is urged to the left side, that is, from the second position to the first position by a coil spring 56B described later.

  The third gear 53 is a gear that is rotated about the left-right direction 9 as an axial direction, and meshes with the second gear 52 in the first position. The fourth gear 54 is a gear that is rotated about the left-right direction 9 as an axial direction, and meshes with the second gear 52 in the second position. In other words, the second gear 52 is configured to be able to switch the meshed gear to either the third gear 53 or the fourth gear 54 by moving between the first position and the second position.

[Switching lever 55]
As shown in FIGS. 3 and 4A, the switching lever 55 includes a protrusion 106, a holding portion 107, and a contact portion 108. The abutting portion 108 is a member that can move along the left-right direction 9 and can rotate about the left-right direction 9 as an axial direction. A coil spring 56B is attached to one surface in the thrust direction of the contact portion 108 (the right surface in the present embodiment). The coil spring 56 </ b> B is disposed along the axial direction of the second gear 52, one end is attached to the right side surface of the contact portion 108, and the other end is fixed to a fixed surface such as the frame 105 </ b> B of the printer unit 11. It is attached. Thereby, the contact part 108 is urged | biased by the coil spring 56B to the left side, ie, toward the 3rd position from the 4th position mentioned later. Further, the right surface of the contact portion 108 receives a restoring force that works in the winding direction of the coil spring 56B. That is, the contact portion 108 is always urged forward (that is, the front side in FIG. 3 and the rear side to the front side in FIG. 4) by the restoring force in the winding direction of the coil spring 56B. The protrusion 106 extends generally upward from the left end portion of the contact portion 108. The holding portion 107 is a plate-like member that is disposed on the upper side of the contact portion 108 and has an opening 110 having an inclined surface 109 and a concave portion 114 as shown in FIG. A protrusion 106 is inserted into the opening 110.

  A portion above the opening 110 of the protrusion 106 is located on the movement path of the carriage 40. The carriage 40 moves in the left-right direction 9 above the paper discharge path 65B when recording an image on recording paper. On the other hand, the carriage 40 is configured to be movable to the upper side outside the paper discharge path 65B in the left-right direction 9. The protrusion 106 is pushed by the carriage 40 that has been moved to the upper side outside the paper discharge path 65B in the left-right direction 9 (hereinafter, this position may be referred to as “home position” or “switching position”). Can be moved to the right. That is, the protrusion 106 and the contact portion 108 of the switching lever 55 can be moved rightward by being pushed by the carriage 40.

  As shown in FIG. 3A, when the carriage 40 is separated from the protrusion 106, the second gear 52 moves to the left by being biased by the coil spring 56B. The urging force of the coil spring 56B is larger than the urging force of the coil spring 56A. As a result, as shown in FIG. 4A, the contact portion 108 moves to the left until the protrusion 106 contacts the left end 113 of the opening 110. When the protrusion 106 comes into contact with the left end 113 of the opening 110, the contact portion 108 and the protrusion 106 are positioned as shown in FIG. Hereinafter, the positions of the contact portion 108 and the protrusion 106 of the switching lever 55 (that is, the position shown in FIG. 3A) are referred to as a third position. In the state of FIG. 3A, the second gear 52 is meshed with the third gear 53 and is in the first position. That is, the contact portion 108 of the switching lever 55 in the third position can hold the second gear 52 in the first position by contacting the second gear 52.

  As shown in FIG. 3B, when the carriage 40 is moved rightward and the protrusion 106 is pushed by the carriage 40, the contact portion 108 first moves rightward from the third position. As a result, the second gear 52 not receiving the urging force from the coil spring 56B is moved to the right by being pushed by the coil spring 56A. Further, the contact portion 108 rotates from the rear side to the front side by the restoring force of the coil spring 56 </ b> B, so that the protrusion 106 rotates in the same manner as the contact portion 108. Thereby, the protrusion 106 fits into the concave portion 114 of the opening 110 as shown by a broken line in FIG. At this time, the contact portion 108 and the protrusion 106 are at the positions shown in FIG. Hereinafter, the positions of the contact portion 108 and the protrusion 106 of the switching lever 55 (that is, the position shown in FIG. 3B) are referred to as a fourth position. In the state of FIG. 3B, the second gear 52 is engaged with the fourth gear 54 and is in the second position. That is, the contact portion 108 of the switching lever 55 in the fourth position can hold the second gear in the second position by contacting the second gear 52.

  When the carriage 40 is further moved rightward in the state where the contact portion 108 and the protrusion 106 are in the fourth position, the protrusion 106 moves rightward along the inclined surface 109 as shown in FIG. . Accordingly, the protrusion 106 is located at a position indicated by a one-dot chain line in FIG. In this state, when the carriage 40 is moved leftward, the carriage 40 is separated from the protrusion 106. Then, the contact portion 108 moves to the left together with the protrusion 106 by being pushed by the coil spring 56B. Further, the second gear 52 moves to the left by being pushed by the contact portion 108 that moves to the left. Since the biasing force of the coil spring 56A is smaller than the biasing force of the coil spring 56B, the second gear 52 moves to the left while resisting the biasing force of the coil spring 56A. As a result, the contact portion 108 reaches the third position as shown in FIG. Further, the protrusion 106 also reaches the third position as shown by a solid line in FIG.

  As described above, the contact portion 108 and the protrusion 106 of the switching lever 55 are selectively movable to the third position and the fourth position by contacting the second gear 52.

  In the drive transmission switching mechanism 50 configured as described above, when the second gear 52 is separated from the third gear 53 and meshed with the fourth gear 54, or away from the fourth gear 54, the third gear 53. Since the positions of the teeth of the gears do not coincide with each other, the second gear 52, the third gear 53, and the fourth gear 54 may not mesh well. That is, there is a possibility that the gear of the second gear 52 is not properly switched.

  Therefore, in the present embodiment, when the gear of the second gear 52 is switched (specifically, immediately after the second gear 52 has moved between the first position and the second position), the control unit 130 (the book 130 described later) According to an example of the control unit of the invention, the forward drive and the reverse drive of the paper feeding motor 70 are alternately executed at least once. That is, the paper feed motor 70 executes at least one operation of being driven to rotate in the reverse direction after being driven in the normal direction or being driven to rotate in the normal direction after being driven in the reverse direction. For example, the paper feed motor 70 repeats the operation of being driven in the reverse direction after being driven in the normal direction, and is executed five times. Further, the respective drive amounts of the forward rotation drive and the reverse rotation drive of the paper feeding motor 70 are at least a rotation amount equal to or greater than the gap between the teeth of each gear.

  As described above, the forward rotation driving and the reverse rotation driving of the sheet feeding motor 70 are alternately performed at least once, whereby the second gear 52 is alternately rotated in the normal rotation and reverse rotation directions. As a result, the teeth of each gear are matched so that they can mesh with each other, and the switching of each gear is performed smoothly and reliably. In the description of “control by the control unit 130”, which will be described later, the above driving of the paper feed motor 70 is described as “forward / reverse rotation of the paper feed motor 70”.

[First transmission unit 27 and third transmission unit 74]
As shown in FIGS. 3 and 5, the feeding roller 25 has a driving force from the paper feeding motor 70 via the first gear 51, the second gear 52, the third gear 53, and the first transmission unit 27. It is rotated by being transmitted. That is, the first transmission unit 27 transmits the driving force of the paper feeding motor 70 from the third gear 53 to the feeding roller 25. As shown in FIGS. 2 and 5, the first transmission unit 27 includes a plurality of gears 115 that are meshed with each other.

  As shown in FIGS. 3 and 5, the fourth transport roller 68 is driven by the sheet feeding motor 70 via the first gear 51, the second gear 52, the third gear 53, and the third transmission portion 74. It is rotated by being transmitted. That is, the third transmission unit 74 transmits the driving force of the paper feeding motor 70 from the third gear 53 to the fourth transport roller 68. As shown in FIG. 5, the third transmission unit 74 includes a plurality of gears 116 that are meshed with each other.

  The drive transmission switching mechanism 50 includes a sun gear 153 that meshes with the third gear 53, and a planet gear 154 that rotates while revolving around the sun gear 153. The planet gear 154 revolves around the sun gear 153 when the third gear 53 rotates in the direction of the arrow 117 by the reverse rotation of the paper feeding motor 70. Thereby, the planet gear 154 meshes with one of the gears 116 constituting the third transmission unit 74 (a planet gear 154 indicated by a broken line in FIG. 5). On the other hand, the planet gear 154 revolves around the sun gear 153 when the third gear 53 rotates in the direction of the arrow 118 due to the forward rotation of the paper feeding motor 70. As a result, the planet gear 154 meshes with one of the gears 115 constituting the first transmission unit 27 (a planet gear 154 indicated by a solid line in FIG. 5). With the above configuration, the drive transmission switching mechanism 50 transmits the driving force of the paper feeding motor 70 that rotates in the forward direction to the feeding roller 25 and transmits the driving force of the paper feeding motor 70 that rotates in the reverse direction to the fourth transport roller 68. . That is, the drive transmission switching mechanism 50 selectively switches the transmission of the driving force from the paper feeding motor 70 to the feed roller 25 or the fourth transport roller 68.

[Second transmission unit 57]
As shown in FIG. 3C, the contact / separation mechanism 90 to be described later is provided from the paper feeding motor 70 via the first gear 51, the second gear 52, the fourth gear 54, and the second transmission portion 57. Driven by the transmission of the driving force.

  As shown in FIGS. 3 and 4B and 4D, the second transmission portion 57 includes a sun gear 155 that meshes with the fourth gear 54, and a planet gear 156 that rotates while revolving around the sun gear 155. It is equipped with. The shaft 157 of the planet gear 156 is inserted through a long hole 159 formed in a fixed plate 158 disposed on the right side of the sun gear 155. Thereby, the shaft 157 of the planet gear 156 can slide along the long hole 159. The long hole 159 has a shape that allows the sun gear 153 and the planet gear 156 to maintain the meshing state even when the shaft 157 slides.

  The sun gear 155 is rotated by the rotation of the fourth gear 54 due to the rotation of the sheet feeding motor 70. The planet gear 156 rotates as the sun gear 155 rotates. The contact / separation mechanism 90 is driven by the rotation of the planet gear 156. As described above, the second transmission unit 57 transmits the driving force of the paper feeding motor 70 from the fourth gear 54 to the contact / separation mechanism 90.

[Contact / separation mechanism 90]
As shown in FIG. 3, the contact / separation mechanism 90 is configured so that the conveyance unit 59 has a first posture in which the pinch roller 61 and the first conveyance roller 60 abut (an example of the first posture of the present invention), and the pinch roller 61. The posture is changed to a second posture (an example of the second posture of the present invention) in which the first transport roller 60 is separated. Here, the conveyance unit 59 in the first posture is shown in FIGS. 3A and 3B, and the conveyance unit 59 in the second posture is shown in FIG. 3C. In the following description, a configuration in which the contact / separation mechanism 90 changes its posture by moving the pinch roller 61 is described. However, the contact / separation mechanism 90 changes its posture by moving the first transport roller 60. May be.

  As shown in FIGS. 3, 4 (C), and 4 (E), the contact / separation mechanism 90 is in contact with the eccentric cam 160 provided on the shaft 157 of the planet gear 156 and the eccentric cam 160 on the upper side of the eccentric cam 160. A fixed plate 161 in contact with the pinch roller 61 and a convex portion 162 projecting from the shaft 35 of the pinch roller 61 toward the shaft 157 of the planet gear 156 are provided. As shown in FIGS. 4C and 4E, the eccentric cam 160 is a disk whose diameter changes periodically from the shaft 157. As shown in FIG. 3, a plurality of pinch rollers 61 are provided along the shaft 35 at a predetermined interval. The convex portion 162 is formed at a position where the pinch roller 61 is not provided on the shaft 35. Further, a hole 163 along the left-right direction 9 is formed in the convex portion 162. The shaft 157 of the planet gear 156 is inserted through the hole 163.

  In the state shown in FIG. 3B (the conveyance portion 59 is in the first posture and the eccentric cam 160 is in the state shown in FIG. 4C), the planet gear is transmitted by drive transmission from the paper feed motor 70. When 156 rotates, the eccentric cam 160 rotates. Thereby, the peripheral surface of the eccentric cam 160 is slid with respect to the fixed plate 161. Since the diameter from the shaft 157 periodically changes on the peripheral surface of the eccentric cam 160, the eccentric cam 160 changes from the state shown in FIG. 4C to the state shown in FIG. That is, the shaft 157 moves downward. In the process of rotation of the eccentric cam 160, the shaft 157 moved downward contacts the lower end of the hole 163. When the shaft 157 moves further downward, as shown in FIG. 3C, the convex portion 162 moves downward by being pushed by the shaft 157. That is, the pinch roller 61 moves downward. Thereby, the conveyance unit 59 changes its posture from the first posture to the second posture. The planet gear 156 moves downward along the long hole 159 by the downward movement of the shaft 157. That is, the planet gear 156 changes from the state shown in FIG. 4B to the state shown in FIG.

  When the planet gear 156 rotates in the state shown in FIG. 3C (the conveyance unit 59 is in the second posture and the eccentric cam 160 is shown in FIG. 4E), the eccentric cam 160 is rotated. Rotates. As a result, contrary to the above, the transport unit 59 changes its posture from the second posture to the first posture.

[Sheet Detection Unit 120]
As shown in FIG. 2, the printer unit 11 includes a leading end of a recording sheet fed from the sheet feeding tray 20 and conveyed along the curved path 65A in the first conveyance direction (a downstream end in the first conveyance direction), and A sheet detection unit 120 that generates a different detection signal when the rear end (upstream end in the first conveyance direction) passes is provided. The sheet detection unit 120 is provided on the downstream side of the merging unit 37 and on the upstream side of the conveying unit 59 in the curved path 65A.

  The sheet detection unit 120 includes, for example, a photo interrupter including a rotating body 112 having detectors 112A and 112B, a light emitting element (for example, a light emitting diode), and a light receiving element (for example, a phototransistor) that receives light output from the light emitting element. And the like optical sensor 111. The rotating body 112 is provided to be rotatable about a shaft 123. The shaft 123 is attached to the inner guide member 19. The detector 112A protrudes from the shaft 123 toward the curved path 65A. In a state where no external force is applied to the rotator 112, the detector 112B enters the optical path from the light emitting element to the light receiving element of the optical sensor 111, and blocks light passing through the optical path. At this time, the light receiving element outputs a LOW level signal (that is, a signal whose signal level is less than the threshold) to the control unit 130. On the other hand, when the rotating body 112 is rotated by being pushed by the leading edge of the recording paper, the detector 112B is removed from the optical path, and light passes through the optical path. At this time, the light receiving element outputs a HIGH level signal (that is, a signal having a signal level equal to or higher than a threshold value) to the control unit 130.

  The optical sensor 111 outputs an analog electric signal (voltage signal or current signal, an example of the detection signal of the present invention) corresponding to the intensity of light received by the light receiving element to the control unit 130 (see FIG. 6) described later.

[First rotary encoder 73]
As shown in FIG. 6, the multifunction machine 10 includes a first rotary encoder 73. The first rotary encoder 73 is attached to a shaft (not shown) of the first transport roller 60, and a known encoder disk (not shown) that rotates integrally with the shaft, and a known optical sensor (not shown). It consists of The encoder disk is formed with a pattern (not shown) in which a plurality of transmitting portions that transmit light and non-transmitting portions that do not transmit light are alternately arranged at equal pitches in a circumferential direction concentric with the rotation center. Yes. The optical sensor is provided on the encoder disk at a position facing the position where the pattern is formed. When the encoder disk rotates with the shaft of the conveyance motor 71, a pulse signal is generated by the optical sensor by the pattern formed on the encoder disk. The generated pulse signal is output from the optical sensor to the control unit 130 described later. In the present embodiment, a second rotary encoder 75 similar to the first rotary encoder 73 described above is attached to the shaft of the paper feeding motor 70.

[Linear encoder 76]
As shown in FIG. 6, the multifunction machine 10 includes a linear encoder 76. The linear encoder 76 includes an encoder strip (not shown) and an optical sensor (not shown). The encoder strip is attached in a state where its longitudinal direction is along the left-right direction 9 on a guide rail on which the carriage 40 is supported. The encoder strip is formed in the longitudinal direction with a pattern (not shown) in which a plurality of transmitting portions that transmit light and non-transmitting portions that do not transmit light are alternately arranged at an equal pitch. The optical sensor is attached to the carriage 40 so as to face the pattern of the encoder strip. Further, the optical sensor is electrically connected to the control unit 130. When the carriage 40 moves, a pulse signal corresponding to the pattern formed on the encoder strip is generated by the optical sensor. Then, the generated pulse signal is output from the optical sensor to the control unit 130 described later.

[Control unit 130]
As shown in FIG. 6, the control unit 130 controls the overall operation of the multifunction machine 10. The present invention is realized when the control unit 130 performs control according to a flowchart (see FIG. 7) described later. The control unit 130 is configured as a microcomputer mainly including a CPU 131, a ROM 132, a RAM 133, an EEPROM 134, and an ASIC 135. These are connected by an internal bus 137.

  The ROM 132 stores a program for the CPU 131 to control various operations. The RAM 133 is used as a storage area for temporarily recording data and signals used when the CPU 131 executes the program, or as a work area for data processing. The EEPROM 134 stores settings, flags, and the like that should be retained even after the power is turned off.

  Connected to the ASIC 135 are a paper feed motor 70, a transport motor 71, and a carriage drive motor 103. When a drive signal for rotating each motor is input from the CPU 131 to a drive circuit corresponding to a predetermined motor, a drive current corresponding to the drive signal is output from the drive circuit to the corresponding motor. As a result, the corresponding motor rotates forward or reverse at a predetermined rotational speed. That is, the control unit 130 controls driving of the paper feed motor 70, the transport motor 71, and the carriage drive motor 103, respectively.

  The ASIC 135 receives pulse signals output from the optical sensors of the first rotary encoder 73 and the second rotary encoder 75. The controller 130 calculates the amount of rotation of the first transport roller 60 or the paper feed motor 70 by counting the number of edges of the pulse signal from the optical sensor. That is, the control unit 130 determines whether or not the number of edges of the pulse signal to be counted has reached the number of edges indicating the target rotation amount, and when the number of edges of the counted pulse signal has reached the target rotation amount, The rotation control of the motor such as stopping the rotation of the motor 71 for feeding or the paper feeding motor 70 is performed. As a result, the rotation of each roller driven by the motor is controlled, and consequently the conveyance of the recording paper is controlled.

  The ASIC 135 receives a pulse signal output from the optical sensor of the linear encoder 76. The control unit 130 acquires the position of the carriage 40 by counting the number of edges of the pulse signal from the optical sensor. That is, the control unit 130 determines whether or not the number of edges of the pulse signal to be counted has reached the number of edges indicating the target movement amount, and when the counted number of edges of the pulse signal has reached the target movement amount, the carriage drive The rotation control of the motor such as stopping the rotation of the motor 103 is performed. Thereby, the movement of the carriage 40 is controlled.

  Further, the optical sensor 111 of the sheet detection unit 120 is connected to the ASIC 135. The electrical signal output from the optical sensor 111 is input to the control unit 130. The controller 130 determines whether or not the electrical level (voltage value or current value) of the input signal is equal to or greater than a predetermined value. The controller 130 determines a HIGH level signal when the input signal is equal to or greater than a predetermined value, and determines a LOW level signal when the input signal is less than the predetermined value. When the input signal is at a HIGH level (that is, the sheet detection unit 120 is ON), the control unit 130 is after the leading edge of the recording paper has passed the rotating body 112 and the trailing edge of the recording paper is the rotating body 112. It is determined that it is before passing. On the other hand, when the input signal is at the LOW level (that is, the sheet detection unit 120 is OFF), the control unit 130 rotates the state before the leading edge of the recording paper reaches the rotating body 112 or the trailing edge of the recording paper. It is determined that the state is after passing through the body 112.

[Acquisition of position of contact part 108]
The RAM 133 stores “1” when the contact portion 108 is located at the third position (hereinafter referred to as “the first flag is ON”), the first flag memory area, and the contact portion 108. Is stored in the fourth position, “1” is stored (hereinafter referred to as “the second flag is ON”), and a second flag memory area is prepared. When the recording paper is fed, the contact portion 108 needs to be positioned at the third position, so the first flag is ON.

  Thereafter, when it is determined from the information of the linear encoder 76 that the carriage 40 has moved to the position where the contact portion 108 is moved to the fourth position, the control unit 130 turns off the first flag (that is, the first flag memory area). On the other hand, the second flag is turned ON. When the carriage 40 moves to a position where the abutting portion 108 is moved further to the right side than the fourth position, and then reverses and moves to the left side, the abutting portion 108 returns to the third position again. . That is, when it is determined from the information of the linear encoder 76 that the carriage 40 has moved as described above, the control unit 130 turns off the second flag (that is, clears the recorded contents of the first flag memory area), while Turn on the first flag. The control unit 130 refers to the contents (specifically, whether “1” is stored or not) stored in the first flag memory area and the second flag memory area prepared in the RAM 133, The current position of the contact portion 108 can be acquired.

[Control by control unit 130]
Thereafter, the movement of the abutting portion 108 of the switching lever 55, the alternate execution of the forward rotation and reverse rotation driving of the paper feed motor 70, and the posture change of the transport portion 59 are executed by the control portion 130 at a predetermined timing. The processing procedure will be described based on the flowchart of FIG. In the following description, it is assumed that the initial state of the contact portion 108 of the switching lever 55 is the third position. The initial posture of the contact / separation mechanism 90 is assumed to be the first posture. Further, it is assumed that the initial state of the drive transmission switching mechanism 50 is a paper feed preparation state.

  When the control unit 130 acquires an instruction to record an image on a recording sheet through the operation panel 17 or a communication line, the control unit 130 performs a series of operations shown in the flowchart of FIG. Here, the image recording instruction includes print information necessary for executing the image recording process. The print information includes, for example, the number of pages of an image to be recorded on a recording sheet (hereinafter referred to as “recording target image”), the image data of the recording target image, the resolution of the image data, the size of the recording sheet, the recording sheet Part or all of the information indicating the orientation and the presence / absence of back side printing is included.

  First, the control unit 130 starts feeding a recording sheet (S10). Specifically, the control unit 130 drives the paper feed motor 70 to rotate the feed roller 25 and sends the recording paper from the paper feed tray 20 to the curved path 65A.

  Next, the control unit 130 stands by until the leading edge of the recording paper reaches the conveyance unit 59 based on signals output from the sheet detection unit 120 and the first rotary encoder 73 (S20: No). Specifically, the control unit 130 determines that the leading edge of the recording paper has reached the position of the sheet detection unit 120 because the detection signal output from the sheet detection unit 120 has changed from a LOW level signal to a HIGH level signal. That is, it is recognized that the leading edge of the recording sheet has been transported a distance corresponding to the section A (see FIG. 2) of the transport path 65. Next, the control unit 130 reaches the number of edges of the pulse signal output from the first rotary encoder 73 that corresponds to the distance from the position of the sheet detection unit 120 to the position of the conveyance unit 59 at the leading edge of the recording paper. By doing this, it is determined that the leading edge of the recording paper has reached the transport section 59, that is, the leading edge of the recording paper has been transported a distance corresponding to the section B of the transport path 65 (see FIG. 2).

  When the leading edge of the recording paper reaches the transport unit 59 (S20: Yes), the control unit 130 ends the feeding of the recording paper (S30). Specifically, the control unit 130 stops the paper feeding motor 70. Next, the control unit 130 compares the value indicating the resolution of the recording target image included in the acquired print information with the value indicating the reference resolution stored in the ROM 132 (or the EEPROM 134) (S40). The resolution of the image to be recorded in step S40 is used as an index representing the amount of ink ejected from the recording unit 24 onto the recording paper. When the value indicating the resolution of the recording target image exceeds the value indicating the reference resolution (that is, the value indicating the amount of ejected ink exceeds the threshold) (S40: Yes), the control unit 130 performs the separation preparation operation. Is executed (S50).

  The case where the control unit 130 determines Yes in step S40 refers to JAM (hereinafter referred to as “JAM caused by landed ink”) that is caused by curling of the recording paper due to the impact of the landed ink. This is a case where the probability of occurrence is high. On the other hand, when the value indicating the resolution of the recording target image is equal to or less than the value indicating the reference resolution (that is, the amount of ejected ink is equal to or less than the threshold) (S40: No), the control unit 130 skips the separation preparation operation. The case where the control unit 130 determines No in step S40 is a case where the occurrence probability of JAM due to the landed ink is low.

  The separation preparation operation in step S50 refers to an operation of switching the drive transmission switching mechanism 50 from the paper feed preparation state to the separation preparation state. That is, the control unit 130 drives the carriage drive motor 103 to move the carriage 40 to the switching position, thereby moving the contact portion 108 from the third position to the fourth position. As a result, the second gear 52 moves from the first position toward the second position. Next, the control unit 130 rotates the paper feeding motor 70 forward and backward so that the second gear 52 and the fourth gear 54 are reliably engaged with each other. As a result, the second gear 52 reaches the second position. In addition, since the separation preparation operation performed in steps S120 and S260 described later is common to the above-described separation preparation operation, description thereof will be omitted.

  Note that the timing of executing the determination in step S40 is not limited to the example of FIG. For example, the control unit 130 may compare the resolution of the recording target image with the reference resolution at the timing when the print information is acquired in step S10, and store a flag indicating the comparison result in the RAM 133 or the like. In step S40, the control unit 130 may determine whether or not to perform the separation preparation operation according to the value of the flag. That is, the separation preparation operation in step S50 is executed when the leading edge of the recording paper reaches the transport unit 59 and the resolution of the recording target image exceeds the reference resolution.

  Next, the control unit 130 conveys the recording paper to the image recording position (S60). Specifically, the control unit 130 drives the conveyance motor 71 to cause the conveyance unit 59 to convey the recording paper, and temporarily stops the conveyance motor 71 when the leading edge of the recording paper reaches the cueing position 33. Let

  Next, the control unit 130 performs image recording on the recording sheet (S70). Specifically, the control unit 130 drives the carriage drive motor 103 to reciprocate the carriage 40 in the left-right direction 9. Further, the control unit 130 causes the recording head 38 to eject ink while moving the carriage 40. That is, the recording unit 24 records an image on a recording sheet for each predetermined line feed width in the first conveyance direction. Hereinafter, the operation described in step S70 is referred to as “image recording with a predetermined line feed width”.

  When the separation preparation operation is executed in step S50, the control unit 130 executes conveyance of the recording paper (S60) and image recording with a predetermined line feed width (S70) in parallel with the separation preparation operation. Also good. More specifically, the control unit 130 moves the contact portion 108 from the third position to the fourth position, and then simultaneously with forward / reverse rotation of the paper feed motor 70 (or forward / reverse rotation of the paper feed motor 70). The process of step S60 may be started during Thereby, it is possible to suppress a decrease in throughput due to the state switching of the drive transmission switching mechanism 50. On the other hand, the control unit 130 may start the process of step S60 after the completion of the separation preparation operation of step S50. As a result, JAM does not occur before the separation preparation operation is completed, so that complicated JAM processing is not requested to the user. The above description is similarly applied to the start timings of steps S130 and S70 when the separation preparation operation is performed in step S120 described later.

  Next, the control unit 130 determines whether or not JAM has occurred (S80). Specifically, the control unit 130 determines whether the drive current of the carriage drive motor 103 or the conveyance motor 71 has an abnormal value. When the drive current of each motor shows an abnormal value, JAM occurs, that is, the recording paper is jammed. As an example, when the recording paper and the carriage 40 collide, the control unit 130 increases the drive current of the carriage drive motor 103 in an attempt to reach the carriage 40 at the target position. However, since the movement of the carriage 40, that is, the rotation of the carriage drive motor 103 is hindered by the recording paper, when the control unit 130 increases the drive current, the drive current eventually exceeds the abnormal value. As another example, the recording paper being conveyed may be jammed. Also in this case, similarly to the above, since the jammed recording paper prevents the rotation of the conveyance motor 71, the control unit 130 increases the drive current of the conveyance motor 71 in an attempt to reach the target rotation amount. Go. Therefore, when the drive current is increased, the drive current eventually exceeds the abnormal value.

  When it is determined that no JAM has occurred (S80: No), the control unit 130 determines whether or not image data to be recorded remains in the next predetermined line feed width of the recording sheet (S90). When image data to be recorded remains on the recording paper (S90: Yes), the control unit 130 represents a value indicating the amount of ink actually ejected in the image recording with a predetermined line feed width that was executed immediately before, and A value indicating the reference amount stored in the ROM 132 (or the EEPROM 134) is compared (S100). Note that the ink ejection amount in step S100 is used as an index representing the amount of ink ejected from the recording unit 24 onto the recording paper, similarly to the resolution in step S40. Further, as a value indicating the ink discharge amount, a value obtained by counting the ink amount actually discharged from the nozzles may be used, or an ink amount calculated from the image data of the recording target image may be used.

  In step S100, when the value indicating the amount of actually ejected ink exceeds the value indicating the reference amount (that is, the amount of ejected ink exceeds the threshold), the occurrence of JAM caused by the landed ink This is a case where the probability is high. On the other hand, when the value indicating the amount of ink actually ejected is less than or equal to the value indicating the reference amount (that is, the amount of ejected ink is less than or equal to the threshold), the probability of occurrence of JAM due to the landed ink is low. This is the case.

  Therefore, the control unit 130 determines that the value indicating the amount of ink actually ejected in the image recording with the predetermined line feed width executed immediately before exceeds the value indicating the reference amount (S100: Yes), and the drive transmission switching mechanism. When 50 is in a paper feed preparation state (S110: Yes), a separation preparation operation is executed (S120). Here, the case where the drive transmission switching mechanism 50 is in the paper feed preparation state is when the first flag of the RAM 133 is ON. That is, the control unit 130 determines whether or not the first flag is ON. On the other hand, when one or both of the conditions of steps S100 and S110 are not satisfied (S100: No or S110: No), the control unit 130 skips the separation preparation operation. That is, the separation preparation operation in the present embodiment is not necessarily performed before the image recording is started (that is, at the timing of step S50), and is discharged after the leading edge of the recording paper reaches the conveyance unit 59. It is executed at an arbitrary timing until the unit 64 is reached.

  Next, the control unit 130 drives the conveyance motor 71 to cause the conveyance unit 59 to further convey the recording sheet by a predetermined line feed width (S130). Next, the control unit 130 determines whether or not the trailing edge of the recording sheet has passed the transport unit 59 (S140). If the trailing edge of the recording paper has not yet passed through the conveyance unit 59 (S140: No), the process returns to step S70 and image recording with the next predetermined line feed width is executed.

  On the other hand, when the trailing edge of the recording sheet has passed through the conveyance unit 59 (S140: Yes), the control unit 130 determines whether or not the drive transmission switching mechanism 50 is in a separation preparation state (S150). Here, the case where the drive transmission switching mechanism 50 is in the separation preparation state is when the second flag of the RAM 133 is ON. That is, the control unit 130 determines whether or not the second flag is ON. If the drive transmission switching mechanism 50 is in the separation preparation state (S150: Yes), the control unit 130 executes the paper feeding preparation operation (S160), and if not, the control unit 130 skips the paper feeding preparation operation ( S150: No), it returns to step S70.

  The paper feed preparation operation refers to an operation of switching the drive transmission switching mechanism 50 from the separation preparation state to the paper feed preparation state. That is, the control unit 130 drives the carriage drive motor 103 to move the carriage 40 to the switching position, thereby moving the contact unit 108 from the fourth position to the third position. As a result, the second gear 52 moves from the second position toward the first position. Next, the control unit 130 causes the second gear 52 and the third gear 53 to mesh with each other by rotating the paper feeding motor 70 forward and backward, so that the second gear reaches the first position. Note that the paper feed preparation operation executed in step S190, which will be described later, is common to the above-described paper feed preparation operation, and thus the description thereof is omitted.

  Here, returning to step S90, when all the recording target images have been recorded on the recording paper (that is, there is no image data to be recorded on the recording paper being conveyed), the control unit 130 discharges the recording paper. (S170). Specifically, the control unit 130 drives the conveyance motor 71 to rotate the first conveyance roller 60, the second conveyance roller 63, and the third conveyance roller 45, and outputs the recording paper to the paper discharge tray 21 or Transport to the second transport path 67.

  Further, if the drive transmission switching mechanism 50 is in the separation preparation state (S180: Yes), the control unit 130 executes the paper feeding preparation operation (S190), and if it is not in the separation preparation state, skips the paper feeding preparation operation (S190). S180: No). Note that the paper feed preparation operation in step S190 can be executed in parallel with the paper discharge process in step S170.

  Next, the control unit 130 determines whether there is a recording target image of the next page (S200). If there is an image to be recorded on the next page (S200: Yes), the recording paper has been discharged (that is, the trailing edge of the recording paper has passed through the third conveyance roller 45 and the spur 46). At this point, the paper discharge is finished (step S210), and the process returns to step S20 to execute image recording on the next recording sheet. Note that when the recording target image of the next page is printed on the back side of the recording paper discharged in step S170, the recording paper discharged in step S170 passes through the second conveyance path 67 instead of step S20. Except for the point that the sheet is conveyed again to the conveyance unit 59, the processes common to the above-described steps S70 to S190 are executed. On the other hand, when the recording target image of the next page does not exist (S200: No), the control unit 130 normally ends the image recording process (S220).

  Here, returning to step S80, when it is determined that JAM has occurred during the image recording process (S80: Yes), the control unit 130 determines whether or not the drive transmission switching mechanism 50 is in the separation preparation state ( S230). If the drive transmission switching mechanism 50 is in the separation preparation state (S230: Yes), the control unit 130 drives the paper feed motor 70 to separate the first conveyance roller 60 and the pinch roller 61 of the conveyance unit 59 from each other. (S240). Specifically, as a result of the driving force of the paper feeding motor 70 being transmitted to the contact / separation mechanism 90 via the first gear 51, the second gear 52, the fourth gear 54, and the second transmission unit 57, the conveyance unit 59 changes the posture from the first posture to the second posture. Then, the control unit 130 abnormally ends the image recording process by notifying the user of the occurrence of JAM through the operation panel 17 or a speaker (not shown) (S270).

  On the other hand, in step S230, if the drive transmission switching mechanism 50 is in the paper feed preparation state, that is, not in the separation preparation state (S230: No), the control unit 130 causes the carriage 40 ("CR" in FIG. 7) immediately before the occurrence of JAM. ) Is determined (S250). In step S <b> 250, the control unit 130 may determine the movement direction of the carriage 40 based on the rotation direction of the carriage drive motor 103.

  When the carriage 40 is moving in the direction away from the switching position (from right to left in FIG. 3, hereinafter referred to as “FWD direction”) (S250: Yes), the control unit 130 causes the carriage drive motor 103 to move. Is driven in reverse to move the carriage 40 to the switching position to perform the separation preparation operation (S260), and the feed motor 70 is driven in reverse to change the conveying portion 59 from the first posture to the second posture. (S240), the image recording process is abnormally terminated (S270). The control unit 130 counts the number of edges of the pulse signal output from the optical sensor of the second rotary encoder 75, and the transport unit 59 changes from the first posture to the second posture when the count number exceeds a predetermined number. At this time, it is determined that the posture has changed, and the reverse rotation driving of the paper feeding motor 70 for changing the posture is terminated. On the other hand, when the carriage 40 is moving in the direction approaching the switching position (from left to right in FIG. 3 and hereinafter referred to as “RVS direction”) (S250: No), the control unit 130 prepares for separation. The operation is skipped, and the image recording process is abnormally terminated (S270).

[Effect of the embodiment]
According to the above configuration, the first transfer roller 60 and the pinch roller 61 can be separated when JAM occurs by previously performing the separation preparation operation and setting the drive transmission switching mechanism 50 in the separation preparation state. it can. As a result, JAM processing can be easily performed.

  The separation preparation operation in the flow of FIG. 7 is executed only when the occurrence probability of JAM due to ink landed on the recording sheet is high (Yes in S40 or Yes in S100), and the occurrence probability of JAM is low. Will not be executed. As a result, the number of executions of the separation preparation operation and the paper feed preparation operation is reduced as compared with the case where the determinations in steps S40 and S100 are not performed, so that the drive is performed when image recording is continuously performed on a plurality of sheets. A reduction in throughput due to the state switching of the transmission switching mechanism 50 can be reduced.

  Here, the resolution of the image to be recorded in step S40 or the amount of ink actually ejected in step S100 is used as an index for estimating the occurrence probability of JAM caused by the ink landed on the recording paper. That is, if the reference resolution and the reference amount are set high, the separation preparation operation is difficult to be executed, so that JAM processing becomes easy, but a certain decrease in throughput is unavoidable. On the other hand, if the reference resolution and the reference amount are set low, the separation preparation operation is easily performed, so that a decrease in throughput can be minimized, but JAM processing may take time. Therefore, the reference resolution and the reference amount (threshold value) are predetermined values in consideration of the balance between the viewpoint of facilitating JAM processing and the viewpoint of suppressing the decrease in throughput, and can be arbitrarily changed by the user. May be.

  In addition, after the trailing edge of the recording sheet passes through the conveying unit 59, it is not necessary to separate the first conveying roller 60 and the pinch roller 61 in the JAM processing. By executing the paper preparation operation (S160), a decrease in throughput due to the state switching of the drive transmission switching mechanism 50 can be minimized. Similarly, by performing the paper feed preparation operation in parallel with the recording paper discharge process (S170) in step S190, a decrease in throughput due to the state switching of the drive transmission switching mechanism 50 is minimized.

  Furthermore, even if the separation preparation operation is not executed before the occurrence of JAM, if the carriage 40 has moved in the FWD direction immediately before the occurrence of JAM (S250: Yes), the first conveyance roller 60 and the pinch roller 61 Can be separated from each other (S260). In other words, the reason why the first conveying roller 60 and the pinch roller cannot be separated from each other is determined that the probability of occurrence of JAM due to ink landed on the recording paper is low (No in S40 and No in S100). And it is limited to the case where the carriage 40 is moving in the RVS direction immediately before the occurrence of JAM. That is, according to this embodiment, even if the number of times of state switching of the drive transmission switching mechanism 50 is reduced in order to suppress a decrease in throughput, the possibility that the JAM processing becomes complicated can be reduced.

[Modification]
The control unit 130 estimates the amount of ink that lands on the recording paper from the resolution of the recording target image in step S40 of FIG. 7, but the present invention is not limited to this. For example, the control unit 130 calculates the amount of ink ejected from the nozzles based on the image data of the recording target image, and executes the separation preparation operation when the calculated amount of ink exceeds a predetermined reference amount. The separation preparation operation may not be executed when the calculated ink amount is equal to or less than the reference amount. Further, the amount of ink calculated here may be the value of the entire recording target image (for one page), or the amount of ink ejected to a portion corresponding to a predetermined line feed width in the recording target image. It may be a value shown.

  Further, the control unit 130 estimates the occurrence probability of JAM from the value indicating the amount of ink landed on the recording paper in steps S40 and S100 of FIG. 7, but the present invention is not limited to this. For example, the control unit 130 may estimate the occurrence probability of JAM based on the direction of the fibers constituting the recording paper. That is, instead of step S40, the control unit 130 performs the separation preparation operation when it is determined that the direction of the fibers constituting the recording paper and the first transport direction intersect, and the direction of the fibers constituting the recording paper is determined. The separation preparation operation may not be executed when it is determined that the direction is the first conveyance direction (the direction of the fibers and the first conveyance direction are substantially parallel).

  For example, the control unit 130 can estimate the direction of the fibers constituting the recording paper by a combination of the size and orientation of the recording paper placed on the paper feed tray 20. For example, when the A4 size recording paper is placed on the paper feed tray 20 with the longitudinal direction facing the first transport direction, the control unit 130 determines that the direction of the fibers constituting the recording paper is along the first transport direction. When the A4 size recording paper is placed on the paper feed tray 20 with the short direction facing the first transport direction, the direction of the fibers constituting the recording paper and the first transport direction are It may be determined that they intersect. The relationship between the combination of the size and orientation of the recording paper as described above and the fiber direction may be stored in advance in the ROM 132 (or the EEPROM 134). Alternatively, the control unit 130 may acquire the direction of the fibers constituting the recording paper from the user through the operation panel 17.

  Further, in step S40 in FIG. 7, the control unit 130 uses both the comparison result between the resolution of the image to be recorded and the reference resolution, and the comparison result between the direction of the fibers constituting the recording paper and the first transport direction. Thus, it may be determined whether or not to perform the separation preparation operation. That is, the control unit 130 may perform the separation preparation operation when either one of the above two conditions is satisfied, and may not perform the separation preparation operation when both are not satisfied.

  Further, in the example of determining whether or not the separation preparation operation is to be executed using the actually ejected ink amount in step S100 in FIG. 7, the ink amount used here is “predetermined. It may be the amount of ink ejected at one time just before “image recording of line feed width”, or the amount of ink ejected at the previous two times or more. Further, whether or not the separation preparation operation is executed by comparing the ink amount ejected in the next image recording with a predetermined line feed width with the reference amount instead of the ink amount ejected in the past in step S100. It may be judged. That is, the control unit 130 calculates the amount of ink ejected from the image data of the recording target image in the next image recording with a predetermined line feed width, and performs the separation preparation operation when the calculated ink amount exceeds the reference amount. The separation preparation operation may not be executed when the calculated amount of ink is equal to or less than the reference amount.

  Further, although an example has been described in which the paper feed preparation operation is executed on the condition that the trailing edge of the recording paper has passed the transport unit 59 in step S140 of FIG. 7, the present invention is not limited to this. For example, instead of step S140, the control unit 130 may execute a paper feed preparation operation on condition that the leading edge of the recording paper has passed the discharge unit 64. The probability of occurrence of JAM after the recording sheet is sandwiched between the second transport roller 62 and the spur 63 is significantly lower than that before the recording sheet is sandwiched. Further, the leading edge of the recording paper reaches the discharge section 64 before the trailing edge passes through the transport section 59. That is, by controlling the timing of the paper feeding preparation operation under the above conditions, it is possible to further suppress a decrease in throughput.

DESCRIPTION OF SYMBOLS 11 ... Printer part 15 ... Paper feed part 24 ... Recording part 50 ... Drive transmission switching mechanism 59 ... Conveyance part 65 ... 1st conveyance path 70 ... Paper feed motor 90 ... Contact / separation mechanism 103 ... carriage drive motor 130 ... control unit

Claims (8)

A feeding unit that feeds the recording medium to the conveyance path;
A transport unit that transports the recording medium fed to the transport path by the feed unit to a downstream side in a transport direction by being sandwiched by a plurality of rollers;
A recording unit that is disposed on the downstream side of the transport unit, moves in a scanning direction orthogonal to the transport direction, and performs image recording by discharging ink toward the recording medium;
A discharge unit disposed on the downstream side from the recording unit and sandwiching the recording medium and discharging the recording medium to the downstream side;
A contact / separation mechanism for changing the posture of the transport unit between a first posture in which the plurality of rollers abut each other and a second posture in which the plurality of rollers are separated from each other;
A first motor for moving the recording unit in the scanning direction;
A second motor for driving the feeding unit and the contact / separation mechanism;
When the recording unit moves to a predetermined switching position, the meshing state of a plurality of gears, the first state in which the driving force of the second motor is transmitted to the feeding unit, and the driving of the second motor A switching mechanism capable of switching to a second state in which force is transmitted to the contact / separation mechanism;
A controller that controls driving of the first motor and the second motor,
The control unit
The recording unit is driven by driving the first motor on the condition that the amount of ink ejected from the recording unit to the recording medium exceeds a threshold value and the recording medium is sandwiched between the conveyance units. Is moved to the switching position to switch the switching mechanism from the first state to the second state, and then performs a separation preparation operation for causing the second motor to alternately perform forward rotation and reverse rotation at least once. Run ,
After the leading edge of the recording medium has passed through the discharge section and before the trailing edge has passed through the transport section, the switching is performed by driving the first motor and moving the recording section to the switching position. An ink jet recording apparatus that performs a feeding preparation operation for causing the second motor to alternately perform forward rotation and reverse rotation at least once after the mechanism is switched from the second state to the first state .   The inkjet recording apparatus according to claim 1, wherein the control unit executes the separation preparation operation before a leading end of the recording medium reaches the discharge unit. The control unit determines that the amount of ink ejected from the recording unit to the recording medium exceeds a threshold when the resolution of an image recorded on the recording medium exceeds a reference resolution, and the separation is performed. an ink jet recording apparatus according to claim 1 or 2 to perform the preparatory operation. The recording unit records an image on the recording medium for each predetermined width in the transport direction,
When the amount of ink ejected on the image recording surface having the predetermined width on which image recording was performed immediately before exceeds the reference amount, the control unit controls the amount of ink ejected from the recording unit to the recording medium. it is determined that the amount is above the threshold, an ink jet recording apparatus according to claim 1 or 2 for executing the spacing preparation operation. The recording unit records an image on the recording medium for each predetermined width in the transport direction,
The controller controls the amount of ink ejected from the recording unit onto the recording medium when the amount of ink ejected onto the image recording surface having the predetermined width where image recording is performed next exceeds a reference amount. There it is determined to exceed the threshold value, the ink jet recording apparatus according to claim 1 or 2 for executing the spacing preparation operation. The ink jet recording apparatus according to claim 4 , wherein the control unit causes the recording head to start image recording on an image recording surface of the next predetermined width after the separation preparation operation is completed. A feeding unit that feeds the recording medium to the conveyance path;
A transport unit that transports the recording medium fed to the transport path by the feed unit to a downstream side in a transport direction by being sandwiched by a plurality of rollers;
A recording unit that is disposed on the downstream side of the transport unit, moves in a scanning direction orthogonal to the transport direction, and performs image recording by discharging ink toward the recording medium;
A discharge unit disposed on the downstream side from the recording unit and sandwiching the recording medium and discharging the recording medium to the downstream side;
A contact / separation mechanism for changing the posture of the transport unit between a first posture in which the plurality of rollers abut each other and a second posture in which the plurality of rollers are separated from each other;
A first motor for moving the recording unit in the scanning direction;
A second motor for driving the feeding unit and the contact / separation mechanism;
When the recording unit moves to a predetermined switching position, the meshing state of a plurality of gears, the first state in which the driving force of the second motor is transmitted to the feeding unit, and the driving of the second motor A switching mechanism capable of switching to a second state in which force is transmitted to the contact / separation mechanism;
A controller that controls driving of the first motor and the second motor,
The control unit
It is determined that the direction of the fibers constituting the recording medium intersects with the conveyance direction, and the recording is performed by driving the first motor on the condition that the recording medium is sandwiched between the conveyance units. The meshing state of the switching mechanism is switched from the first state to the second state by moving the part to the switching position, and then the second motor is alternately executed at least once for forward rotation and reverse rotation. Execute separation preparation operation ,
After the leading edge of the recording medium has passed through the discharge section and before the trailing edge has passed through the transport section, the switching is performed by driving the first motor and moving the recording section to the switching position. An ink jet recording apparatus that performs a feeding preparation operation for causing the second motor to alternately perform forward rotation and reverse rotation at least once after the mechanism is switched from the second state to the first state . The switching position is one end in the main scanning direction,
The controller controls the first motor on the condition that the recording medium is jammed in the conveyance path while the recording unit is moving from one end to the other end in the scanning direction. The recording unit is moved to one end in the scanning direction, and the second motor is caused to alternately perform forward rotation and reverse rotation at least once, and the second motor is driven to perform the contact / separation. The inkjet recording apparatus according to claim 1, wherein the mechanism is changed in posture from the first posture to the second posture.

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