JP7163738B2 - Recording device and recording device control method - Google Patents

Description

The present invention relates to a recording apparatus having a conveying mechanism for conveying a medium and a carriage mounted with a recording head for recording on the medium and scanned, and a control method for the recording apparatus.

Japanese Patent Application Laid-Open No. 2002-200003 discloses a serial type apparatus including a carriage on which a recording head is mounted, and a moving means (an example of a transporting mechanism) for moving a sheet (an example of a transporting mechanism) including a transporting roller for transporting a sheet (an example of a medium) and an ejection roller. A recording device is disclosed. The printing apparatus sequentially prints an image on a sheet by repeating a printing scan in which ink is ejected while moving a printing head together with a carriage and an intermittent conveying operation by a moving means.

This recording apparatus includes first detecting means for detecting the leading edge of the sheet at a position upstream from the recording position, second detecting means for detecting the leading edge of the sheet at a position downstream from the recording position, and a second detector. and calculating means for calculating the position of the leading edge of the sheet based on the movement amount of the moving means after the leading edge of the sheet is detected by the detecting means. If the leading edge of the sheet is not detected by the second detecting means even though the position of the leading edge calculated by the calculating means reaches the second detecting means, the sheet may be jammed or the like. It is determined that an abnormality has occurred, and the operation of the moving means and the recording operation of the recording head are stopped.

In addition, the printing apparatus described in Japanese Patent Application Laid-Open No. 2002-200011 performs simultaneous control (an example of superposition control) in which the sheet conveying operation and the carriage scanning are overlapped in timing except when ink is ejected from the print head. During execution of such simultaneous control, if an abnormality such as a jam is detected because the leading edge of a medium such as a sheet does not reach the detection area of the second detection means, the transport operation and the start before the transport operation is stopped. The scanning of the detected carriage is forcibly stopped.

JP 2012-45860 A

However, even if no jam occurs, the medium may momentarily bend and float when the leading edge of the medium enters the pair of discharge rollers located downstream of the recording head. In this case, if the scanning of the carriage is started before the conveying operation is stopped due to superposition control, the printing head comes into contact with the floated medium, and rubbing occurs between the medium and the printing head. This rubbing causes ink stains on the medium, etc., resulting in deterioration of print quality.

A printing apparatus for solving the above problems comprises a printing head that prints on a medium, a carriage mounted with the printing head and scanned, and a carriage that is arranged downstream of the printing head and moves the medium from a position facing the printing head. A transport mechanism including a pair of discharge rollers for discharging, the recording head, the carriage, and the transport mechanism are controlled, and the transport operation of the medium by the transport mechanism and the scanning operation of the recording head by the carriage are performed by the transport operation. and a control unit that executes a superimposition control that partially overlaps and simultaneously performs the transport period of the scanning operation and the scanning period of the scanning operation. In the transport in which the leading edge of the medium reaches the nip position of the discharge roller pair, the superimposition control is not executed.

A method of controlling a printing apparatus for solving the above problems includes a printing head for printing on a medium, a carriage mounted with the printing head and scanned, and a medium arranged downstream of the printing head so as to face the printing head. a transport mechanism including a pair of discharge rollers for discharging from a position where the recording head, the carriage, and the transport mechanism are controlled; and a control unit for executing superimposition control for simultaneously performing the above-mentioned superimposition control, and during execution of the superimposition control, the next transport by the transport mechanism is the transport in which the leading edge of the medium reaches the nip position of the discharge roller pair. If it is the previous transport, a first control step in which the next transport is performed by the superimposition control, and during execution of the superimposition control, the next transport by the transport mechanism is performed so that the leading edge of the medium is the discharge roller pair. a second control step of stopping the superimposition control and performing the next transport under control in which the transport period and the scanning period do not overlap, if the transport reaches the nip position of .

1 is a perspective view of a recording device according to one embodiment; FIG. FIG. 2 is a side sectional view showing a recording device; FIG. 3 is a schematic side view showing a conveying section and a recording section; FIG. 2 is a schematic cross-sectional view showing the essential parts of the recording apparatus; FIG. 2 is a schematic plan cross-sectional view showing a main part of the recording apparatus; FIG. 2 is a block diagram showing the electrical configuration of the recording device; 4 is a timing chart showing recording control in a mode other than the predetermined mode; 4 is a timing chart showing recording control upon jam detection in a mode other than a predetermined mode; 4 is a timing chart showing recording control in a predetermined mode; 4 is a timing chart showing recording control when a jam is detected in a predetermined mode; 4 is a flowchart showing recording control in a mode other than the predetermined mode; 4 is a flowchart showing recording control in a predetermined mode; FIG. 11 is a side view for explaining conveyance in which the leading edge of the medium does not reach the first pair of discharge rollers; FIG. 11 is a side view for explaining conveyance in which the leading edge of the medium reaches the first pair of discharge rollers; FIG. 10 is a side view for explaining conveyance in which the leading edge of the medium reaches the detection area of the discharge sensor; FIG. 11 is a side view showing how the medium floats when the leading edge of the medium enters the first discharge roller pair; FIG. 4 is a side view showing a state in which the medium has reached the detection area of the discharge sensor; FIG. 5 is a side view for explaining switchback conveyance of a medium during double-sided printing; FIG. 11 is a side view showing how the preceding medium is pulled back when the medium is reversely transported; FIG. 11 is a side view for explaining control for ejecting the preceding medium that has been pulled back; FIG. 11 is a side view for explaining control for ejecting a preceding medium that has been pulled back when the maintenance mechanism is driven;

An embodiment of the recording apparatus will be described below with reference to the drawings.
As shown in FIG. 1, the recording apparatus 11 is, for example, a multifunction machine, and has a housing 12 having predetermined lengths in terms of height, depth, and width when installed in a horizontal place of use. The recording device 11 performs recording on a medium M such as paper. The recording apparatus 11 of this embodiment has a reading device 13 on the top of the housing 12 for reading the document D and acquiring the image. The recording device 11 makes a copy by recording the image of the document D read by the reading device 13 on the medium M. FIG. Therefore, the recording device 11, which is a multifunction device, can print, scan, and copy.

The reading device 13 includes a platen 14 , a cover 15 that can be opened and closed with respect to the platen 14 , and an automatic document feeder 16 (ADF (Auto Document Feeder)) mounted on the cover 15 . A plurality of documents D set on the document tray 17 are fed one by one by the automatic document feeder 16 . A document D set on a platen glass (not shown) on the platen 14 with the cover 15 opened is read by a reading section (not shown) in the platen 14 .

The recording apparatus 11 includes a cassette 19 that is detachably inserted into an insertion slot 12A that opens on one side surface of the housing 12 . A discharge port 20 through which the recorded medium M is discharged is provided above the cassette 19 . Below the discharge port 20, a discharge tray 21 for supporting the recorded medium M discharged from the discharge port 20 is attached in a telescopic state. An operation panel 22 for performing various operations is provided on the front upper portion of the housing 12 . An operation panel 22 for performing various operations is provided on the front upper portion of the housing 12 .

The operation panel 22 has an operation section 23 including a plurality of buttons operated when the user gives instructions to the recording apparatus 11 and a display section 24 . The operation unit 23 includes, for example, a power button and a selection button. Various types of information such as menus and messages are displayed on the display unit 24 . The display unit 24 may be configured as a touch panel, which also serves as a part of the operation unit 23 . The surface of the recording device 11 on which the operation panel 22 is arranged is the front surface, and the opposite surface is the back surface (rear surface).

As shown in FIG. 1, a medium feeding mechanism 25 for supporting and feeding a medium M for so-called manual feeding printing is provided at the upper rear portion of the housing 12 . The medium feeding mechanism 25 has a supply tray 29 (see FIG. 2) that can be slid by the user and displaced to an extended state at a predetermined angle. can be fed into the housing 12 one by one. In this embodiment, the direction parallel to the direction from the front surface to the rear surface of the housing 12 is defined as the depth direction X, and the direction orthogonal to both the depth direction X and the vertical direction Z is defined as the width direction Y. The width direction Y and the depth direction X are substantially along the horizontal plane. The depth direction X is also referred to as the transport direction X because it is parallel to the transport direction when the medium M supplied from the cassette 19 is transported through the position facing the recording unit 26 . Further, the width direction Y is a direction that coincides with the width direction of the medium M when it is conveyed inside the housing 12 and intersects with the conveyance direction X. As shown in FIG.

As shown in FIG. 1, the housing 12 contains an ink supply source (not shown) consisting of a tank containing ink or an ink cartridge, and a cassette 19 for supplying ink from the ink supply source. A recording unit 26 for recording on the medium M is provided. The recording unit 26 includes a recording head 27 for recording on the medium M and a carriage 28 on which the recording head 27 is mounted. The recording head 27 has a plurality of nozzles (not shown) that eject ink supplied from an ink supply source through a tube (not shown). Images, documents, and the like are printed on the medium M by ejecting ink droplets from the recording head 27 toward the medium M while the carriage 28 reciprocates in the width direction Y. FIG. At this time, the image of the document D read by the reading device 13 is recorded on the medium M by the recording unit 26 to perform copy printing. The width direction Y is also referred to as the scanning direction Y because it is also the direction in which the carriage 28 is scanned.

FIG. 2 shows the internal structure of the recording device 11 with the reading device 13 removed. As shown in FIG. 2, the recording apparatus 11 includes a transport section 30 that transports the medium M. As shown in FIG. The conveying unit 30 includes a first feeding unit 31 that feeds the medium M from the cassette 19 and a second feeding unit 32 that feeds the medium M placed on the supply tray 29 that constitutes the medium feeding mechanism 25 . , and a transport mechanism 40 that receives the fed medium M and transports it toward the recording unit 26 . The first feeding unit 31 includes a feeding roller 33 capable of feeding the media M set in the cassette 19 one by one. The second feeding unit 32 also includes a paper feed roller 34 that feeds the plurality of media M supported by the supply tray 29 toward the recording unit 26 one by one. The cassette 19 has a hopper (not shown) at the bottom, and when the cassette 19 is inserted into the insertion slot 12A, the hopper rises, and the medium M on the hopper is pressed against the feed roller 33.

The medium feeding mechanism 25 includes a housing 35 with an open top, and a lid 36 that opens and closes the top opening of the housing 35 . A slidable feed tray 29 is accommodated in the housing 35 in a contracted state. The supply tray 29 includes a plate-like mounting portion 37 on which the medium M can be mounted, and a plurality of stages of support portions 38 that slide obliquely upward with respect to the mounting portion 37 to be in the extended state shown in FIG. Prepare. A plurality of media M supported by the supply tray 29 are fed one by one toward the recording unit 26 by the paper feed roller 34 .

Above the recording position located in the middle of the transport path of the medium M transported by the transport mechanism 40, the above-described recording unit 26 is provided, and the medium M is supported at a lower position facing the recording unit 26 across the transport path. A support base 41 is arranged for the purpose. The recording unit 26 includes the recording head 27 and the carriage 28 described above. The carriage 28 is movably supported along a guide shaft 42 that extends in the width direction Y and is installed inside the housing 12 . An image, a document, or the like is recorded on the medium M by ejecting ink from the recording head 27 onto the medium M on the support table 41 while moving the carriage 28 in the scanning direction Y along the guide shaft 42 . Specifically, in the process of moving the carriage 28 in the scanning direction Y, the recording head 27 ejects ink to perform one scan of recording on the medium M, and the conveying mechanism 40 conveys the medium M to the next recording position. Recording is performed on the medium M by alternately repeating the conveying operation. The medium M on which recording has been completed is discharged from the discharge port 20 onto the discharge tray 21 by the transport mechanism 40 .

Next, with reference to FIG. 3, the configuration of the transport section 30 will be described in detail. The direction along the route along which the medium M is transported from upstream to downstream is defined as a first transport direction X1. Also, the direction along the route along which the medium M is transported from downstream to upstream is defined as a second transport direction X2.

The transport unit 30 includes a transport path F0 for transporting the medium M. As shown in FIG. The transporting route F0 includes a first transporting route F1 through which the first feeding unit 31 feeds the medium M, a second transporting route F2 through which the second feeding unit 32 feeds the medium M, and a transporting mechanism 40 that feeds the medium M. It has a third transport path F3 for transporting and discharging M. In addition, the transport path F0 is the second transport direction opposite to the first transport direction X1, which is the direction opposite to the first transport direction X1 after recording the medium M that has been discharged halfway along the third transport path F3 in the first transport direction X1 during double-sided printing. After being reversely transported to X2, it has a fourth transporting path F4 that subsequently transports the medium M backwards in the second transporting direction X2 and returns it to the first transporting path F1 again.

The first feeding unit 31 includes a feeding roller 33 (pickup roller) that contacts the uppermost one of the plurality of media M in the cassette 19 (see FIG. 2), a separation roller 43, and a separation roller 43. It includes a pair of retard rollers 44 and a roller 45 that guides upward one sheet of medium M separated from the separation roller 43 and sent out. Behind the first feeding unit 31 (on the right side in FIG. 3), a guide 50 forming a feeding path along which the medium M is fed from an additional cassette (not shown) extends upward from below. extended.

The first feeding section 31 also includes two intermediate rollers 51 and 52 at a height position between the feeding roller 33 and the second feeding section 32 . The two intermediate rollers 51 and 52 are arranged side by side along the transport direction X. As shown in FIG. That is, the first feeding section 31 includes a first intermediate roller 51 and a second intermediate roller 52 arranged downstream of the first intermediate roller 51 in the first transport direction X1. The first intermediate roller 51 and the second intermediate roller 52 are rotationally driven in conjunction with each other.

Two driven rollers 53 are in contact with the outer peripheral surface of the first intermediate roller 51 , and a driven roller 54 is in contact with the outer peripheral surface of the second intermediate roller 52 . The medium M supplied from the cassette 19 is sandwiched between the first intermediate roller 51 and two driven rollers 53, and is moved in the first transport direction X1 by the counterclockwise rotation of the first intermediate roller 51. transported downstream. The medium M conveyed from the first intermediate roller 51 is sandwiched between the driven roller 54 that contacts the outer peripheral surface of the second intermediate roller 52, and is rotated counterclockwise by the second intermediate roller 52. The sheet is conveyed downstream in the first conveying direction X1. The first transport path F<b>1 and the second transport path F<b>2 join at a meeting point on the outer peripheral surface of the second intermediate roller 52 . Then, downstream of the confluence point, the medium M is transported along the first transport path F1, which is a common transport path.

The second feeding unit 32 includes a sheet feeding roller 34, a retard roller 46 arranged at a position facing the sheet feeding roller 34 across the second conveying path F2, and a retard roller 46 arranged in a position facing the sheet feeding roller 34 across the second conveying path F2. and a roller pair 47 arranged at a position downstream of the . The paper feed roller 34 has, for example, a D-shaped cross section, and feeds the medium M nipped between the arc surface and the retard roller 46 in the course of one rotation of the paper feed roller 34 . In this feeding process, the uppermost medium M among the plurality of mediums M placed on the supply tray 29 (see FIG. 2) is separated by the action of the retard roller 46 . The medium M fed along the second transport path F2 by the second feeding unit 32 is transported from the junction to the first transport path F1.

The first feeding section 31 includes a driven roller 55 that contacts the lower portion of the outer peripheral surface of the second intermediate roller 52 and a driven roller 56 that contacts the lower portion of the outer peripheral surface of the first intermediate roller 51 . As the two intermediate rollers 51 and 52 rotate counterclockwise in FIG. 3, the medium M after recording sandwiched between the driven rollers 55 and 56 is conveyed along the fourth conveying path F4 to the second conveying direction. It is conveyed backward in the direction X2.

The transport mechanism 40 includes a transport roller pair 60 arranged upstream in the transport direction X from the recording unit 26 . The transport roller pair 60 has a rotationally driven transport roller 60A and a driven roller 60B that rotates with the rotation of the transport roller 60A. The transport roller pair 60 receives the fed medium M and transports it toward the recording unit 26 .

The conveying mechanism 40 also includes a first discharge roller pair 61 as an example of a discharge roller pair disposed downstream of the recording head 27 and discharging the medium M from a position facing the recording head 27 . The first discharge roller pair 61 has a rotationally driven discharge roller 61A and a driven roller 61B that rotates with the rotation of the discharge roller 61A. Further, the transport mechanism 40 includes a second discharge roller pair 62 arranged downstream of the first discharge roller pair 61 in the transport direction X. As shown in FIG. The second discharge roller pair 62 has a rotationally driven discharge roller 62A and a driven roller 62B that rotates with the rotation of the discharge roller 62A. The two discharge roller pairs 61 and 62 are driven in conjunction with the transport roller pair 60 to intermittently transport the medium M to a recording position facing the recording unit 26, and move the medium M after recording in the transport direction X. discharge to

Further, in the recording apparatus 11, a plurality of sensors 71 to 74 capable of detecting the medium M being transported are arranged along the transport path F0. Specifically, a feeding sensor 71 that detects the medium M during feeding at a position between the separation roller 43 and the first intermediate roller 51 and a medium M sensor near the nip position between the second intermediate roller 52 and the driven roller 54 . and a transport sensor 73 that detects the medium M at a position upstream of the transport roller pair 60 . Furthermore, the recording apparatus 11 includes an ejection sensor 74 as an example of a detection section on the downstream side of the first ejection roller pair 61 . The ejection sensor 74 detects the medium M after printing at a position downstream of the printing head 27 in the third transport path F3.

The feed sensor 71 detects that the succeeding medium M to be fed next from the cassette 19 (see FIG. 2) has been fed to the standby position. The intermediate sensor 72 detects a jam of the medium M when the intermediate sensor 72 does not detect the medium M even though the intermediate rollers 51, 52, etc. have rotated by the amount of rotation that the leading edge of the medium M reaches the intermediate sensor 72. do. Further, the conveying sensor 73 determines that the medium M is jammed when the medium M is not detected by the conveying sensor 73 even though the intermediate rollers 51 , 52 and the like have rotated by the rotation amount that the leading edge of the medium M reaches the conveying sensor 73 . to detect Further, the transport sensor 73 detects that the medium M has reached the counting start position when the second counter 92 described later counts the transport position of the medium M transported by the transport roller pair 60 . Furthermore, the ejection sensor 74 detects a jam of the medium M when the medium M is not detected even though the transport roller pair 60 and the first ejection roller pair 61 have rotated by the rotation amount that the leading edge of the medium M reaches the ejection sensor 74 . to detect In the example shown in FIG. 3, the ejection sensor 74 is arranged at a position between the first ejection roller pair 61 and the second ejection roller pair 62 in the transport direction X. As shown in FIG.

The discharge sensor 74 is composed of, for example, an optical sensor. In this example, it is configured by a light reflection type optical sensor or a light transmission type optical sensor. Note that the discharge sensor 74 is not limited to a non-contact sensor such as an optical sensor, and may be a contact sensor. As the contact sensor, a sensor that detects a lever that is pushed by the transported medium M and tilts, and a lever that is pushed by the medium M and tilts to a predetermined position from a standby position when the lever is not pushed by the medium M. and a lever type sensor.

The feeding roller 33, the feeding roller 34, the separation roller 43, and the two intermediate rollers 51 and 52 of the feeding system are driven by a feeding motor 69 (see FIG. 6), which is the same drive source. Further, the transport roller 60A and the discharge rollers 61A and 62A, which constitute the transport mechanism 40, are driven by a transport motor 66 (see FIG. 6) which is the same drive source.

As shown in FIG. 4, a carriage 28, which is guided by a guide shaft 42 and reciprocally movable in the width direction Y within the recording apparatus 11, is stretched in a state extending along the width direction Y at a rear rear position of the rear surface thereof. It is fixed to a part of the endless timing belt 48 . The carriage 28 reciprocates in the scanning direction Y along the guide shaft 42 by rotating the timing belt 48 forward or backward by the power of the carriage motor 49 .

As shown in FIGS. 4 and 5, a support base 41 for supporting the medium M is arranged at a lower position facing the movement area of the recording head 27 . An appropriate gap is ensured between the portion of the medium M supported by the support base 41 and the recording head 27 . An image or the like is printed on the medium M by ejecting ink from the recording head 27 toward the medium M while the carriage 28 is reciprocated in the scanning direction Y along the guide shaft 42 .

4 and 5, one end of the movement path of the carriage 28 is a home position HP (home position) where the carriage 28 stands by when not printing. A maintenance mechanism 75, which is an example of another mechanism for cleaning the recording head 27, is arranged at a position corresponding to directly below the carriage 28 arranged at the home position HP. The maintenance mechanism 75 includes a cap 76 capable of coming into contact with and covering a nozzle opening surface 27A on which a plurality of nozzles (not shown) of the recording head 27 are open, a wiper 77 wiping the nozzle opening surface 27A, and a cap. A lifting mechanism 78 for lifting and lowering the wiper 76 and the wiper 77, and a suction pump 79 communicating with the inside of the cap 76 through a tube are provided.

When the carriage 28 is at the home position HP indicated by the solid line in FIG. 4, the cap 76 is lifted by the elevating mechanism 78 from the standby position shown in FIG. As a result, thickening or the like of ink in the nozzles of the recording head 27 is prevented. When the maintenance period comes, the cap 76 is placed at the capping position, and the suction pump 79 sucks the air in the closed space formed between the cap 76 and the nozzle opening surface 27A so as to communicate with the nozzle. is set to a negative pressure, cleaning is performed by sucking and discharging thickened ink, air bubbles, etc. in the recording head 27 together with the ink through the nozzles.

During printing, the carriage 28 periodically or irregularly moves to the home position HP to perform flushing by ejecting ink droplets unrelated to printing from the nozzles of the recording head 27 toward the cap 76 . Flushing refreshes ink in unused nozzles during printing to prevent nozzle clogging. Waste ink accumulated in the cap 76 due to cleaning or flushing is sucked by the suction pump 79 and discharged to the waste liquid tank 64 , where it is absorbed and held by the ink absorbent 65 . Some of the components including the suction pump 79 of the maintenance mechanism 75 are driven by the transport motor 66 shared with the transport mechanism 40 . The recording apparatus 11 also includes a gap adjustment mechanism (not shown) that adjusts the gap between the recording head 27 and the medium M by changing the height position of the recording head 27 with respect to the support base 41 .

The conveying mechanism 40 includes a pair of conveying rollers 60 arranged at a position upstream of the scanning path of the recording head 27 in the conveying direction X, and a first discharge roller 60 arranged at a position downstream of the scanning path of the recording head 27 . A roller pair 61 and a second discharge roller pair 62 are provided. The transport roller pair 60, the first discharge roller pair 61, and the second discharge roller pair 62 are arranged in this order from the upstream side in the transport direction X. The transport roller 60A and the two discharge rollers 61A and 62A are driven by the power of a transport motor 66. As shown in FIG. The driven rollers 61B and 62B constituting the two discharge roller pairs 61 and 62 are toothed rollers. When the transport motor 66 is driven to rotate forward, the roller pairs 60 to 62 rotate in the direction of transporting the medium M in the first transport direction X1, and when driven to rotate in the reverse direction, the roller pairs 60 to 62 rotate the medium. Rotate in the direction of transporting M in the second transport direction X2. The maintenance mechanism 75 is driven when the transport motor 66 is reversely driven.

Further, as shown in FIG. 5 , a first encoder 67 made of a linear encoder is provided in the housing 12 so as to extend along the guide shaft 42 . The first encoder 67 includes a tape-shaped code plate 67A having a large number of slits formed at regular pitches, and an optical sensor 67B provided on the carriage 28 . The first encoder 67 outputs a pulse signal whose number of pulses is proportional to the moving distance of the carriage 28 and whose period is inversely proportional to the moving speed of the carriage 28 . In the recording device 11 , speed control and position control of the carriage 28 are performed based on the movement position, movement speed and movement direction of the carriage 28 which are detected by detecting pulses of the pulse signal from the first encoder 67 .

A second encoder 68 , which is, for example, a rotary encoder, is attached to the end of the drive shaft of the transport roller pair 60 . A second encoder 68 outputs a pulse signal having a number of pulses proportional to the amount of rotation of the transport motor 66 . In the recording device 11, the pulses of the pulse signal from the second encoder 68 are detected, and speed control and stop position control during transport of the medium M are performed.

As shown in FIG. 5, an intermediate sensor 72, a transport sensor 73, and a discharge sensor 74, which can detect the medium M being transported at a predetermined position, are arranged in this order from the upstream side in the transport direction X in the recording apparatus 11. ing. Each of the sensors 72 to 74 is arranged in the width direction Y at the center of the medium transport width. In this example, a center feeding method is employed in which the medium M is fed in a state in which the width center of the medium M coincides with the width center within the medium transport width. Therefore, the sensors 71 to 74 detect the width of the medium M regardless of its size.

Next, the electrical configuration of the recording device 11 will be described with reference to FIG. Note that FIG. 6 shows an electrical configuration related to recording control of the recording device 11 and omits an electrical configuration of the reading device 13 .

As shown in FIG. 6, the recording device 11 has a control section 80 . The control unit 80 incorporates a computer 81 and a memory 82, and the computer 81 executes a program PR stored in the memory 82 to perform various controls including recording control. The recording device 11 is communicably connected to the host device 200 . The control unit 80 performs recording control based on the print data PD received from the host device 200 . Note that the host device 200 is configured by, for example, any one of a personal computer, a personal digital assistant (PDA), a tablet PC, a smart phone, a mobile phone, and the like.

Input terminals of the controller 80 are electrically connected to the feed sensor 71 , the intermediate sensor 72 , the transport sensor 73 , the discharge sensor 74 , the first encoder 67 and the second encoder 68 . Output terminals of the control unit 80 are electrically connected to the recording head 27 , the carriage motor 49 , the feed motor 69 and the transport motor 66 . The control unit 80 is electrically connected to the reading device 13 , and controls the feeding of the document D by the automatic document feeder 16 and the reading control of the document D by the reading device 13 .

The control unit 80 detects the presence or absence of the medium M and the presence or absence of a jam based on the detection results of the sensors 71-74. The ejection sensor 74 detects the presence or absence of the medium M at a position downstream of the recording head 27 . In this example, the ejection sensor 74 detects the presence or absence of the medium M at a position between the first ejection roller pair 61 and the second ejection roller pair 62 in the transport direction X. The discharge sensor 74 is also used to detect a jam of the medium M in the area downstream of the transport sensor 73 .

A control unit 80 controls the recording head 27 , the carriage 28 and the transport mechanism 40 . The control unit 80 performs the transport operation of the medium M by the transport mechanism 40 and the scanning operation of the recording head 27 by the carriage 28 at the same time by partially overlapping the transport period FP of the transport operation and the scanning period SP of the scanning operation. Execute matching control. During the execution of the superimposition control, the control unit 80 executes the superimposition control in the next transport by the transport mechanism 40 in which the leading edge of the medium M reaches the nip position of the first discharge roller pair 61. do not do.

Here, the relationship between the rotation direction of the feed motor 69 and the rotation directions of the rollers 33, 43, 51, 52, etc., and the relationship between the rotation direction of the transport motor 66 and the rotation directions of the roller pairs 60 to 62 will be described. . As shown in FIG. 6, the feed motor 69 is connected to the feed roller 33, the separation roller 43 and the intermediate rollers 51 and 52 via the gear mechanism 101 so as to be capable of power transmission. Both the rollers 33 and 43 rotate forward when the feed motor 69 is driven in the forward direction, and the intermediate rollers 51 and 52 rotate forward when the feed motor 69 is driven in the reverse direction. stops. As a result, the following medium M is sent to the waiting position before the nip position upstream of the first intermediate roller 51 by the rotation of the feeding roller 33, and the following medium M is kept waiting at the waiting position. M can be conveyed by the rotation of intermediate rollers 51 and 52 .

The transport motor 66 is connected to the transport roller pair 60, the first discharge roller pair 61, and the second discharge roller pair 62 via the gear mechanism 102 so as to be able to transmit power. Each of the roller pairs 60 to 62 rotates forward when the transport motor 66 is driven forward to transport the medium M in the first transport direction X1, and reverses when the transport motor 66 is driven reversely to transport the medium M in the first transport direction X1. is conveyed in the second conveying direction X2, which is the opposite direction.

Also, the transport motor 66 is connected to the maintenance mechanism 75 via the gear mechanism 103 so as to be able to transmit power. Power is not transmitted to the maintenance mechanism 75 when the transport motor 66 is driven in the forward direction, and power is transmitted to the maintenance mechanism 75 when the transport motor 66 is driven in the reverse direction. When it is time for maintenance while printing is stopped, the control unit 80 reversely drives the conveying motor 66 to drive the suction pump 79 of the maintenance mechanism 75 and clean the recording head 27 .

In this embodiment, the drive mechanism 100 that drives the first discharge roller pair 61 is configured by the transport motor 66 that drives the first discharge roller pair 61 , the gear mechanism 102 , and the gear mechanism 103 . A second discharge roller pair 62 provided downstream of the discharge sensor 74 is driven by a drive mechanism 100 . The drive mechanism 100 can transmit the driving force for conveying the medium M in the ejection direction to the first ejection roller pair 61 and the second ejection roller pair 62 by forward rotation, and can transmit the driving force to other mechanisms by reverse rotation. be. In this example, the other mechanism is the maintenance mechanism 75, and the maintenance mechanism 75 is driven when the driving mechanism 100 is reversely driven.

The driving mechanism 100 performs forward rotation driving to transport the medium M in the first transport direction X1, which is the medium M ejection direction, and reverse rotation driving to reverse transport in the second transport direction X2, which is the opposite direction to the medium M ejection direction. It is possible. For example, during double-sided printing, after printing is applied to the first side of the medium M, the medium M being recorded is conveyed in the first conveying direction X1 by forward rotation driving of the conveying motor 66 that constitutes the driving mechanism 100. When the recording on the first side of M is completed, the medium M is reversely transported in the second transport direction X2 by driving the transport motor 66 in reverse. By this reverse transport, the medium M is sent from the third transport path F3 to the fourth transport path F4. to the first transport path F1. Then, the medium M is reversed along the outer peripheral surface of the first intermediate roller 51 and conveyed toward the recording section 26 with the second surface opposite to the recorded first surface facing upward. . The medium M printed on the second side by the recording unit 26 is ejected onto the ejection tray 21 after double-sided printing.

Further, as shown in FIG. 6 , the control section 80 includes a computer 81 including a first counter 91 , a second counter 92 , a calculation section 93 and a determination section 94 . The print data PD that the control unit 80 receives from the host device 200 includes print image data and print condition information. The print condition information includes information such as presence/absence of head rubbing avoidance mode, print mode, media type, media size, media type, print color (color/grayscale), presence/absence of double-sided printing (single-sided printing/double-sided printing), etc. be

Here, the “head rubbing avoidance mode” is a mode that actively avoids rubbing of the nozzle opening surface 27</b>A of the recording head 27 with the medium M. The user operates the host device 200 or the operation unit 23 to select the "head rubbing avoidance mode". When the "head rubbing avoidance mode" is selected, the gap between the recording head 27 and the medium M is adjusted by the gap adjusting mechanism to make the second gap larger than the first gap when this mode is not selected. is recorded. Also, the print mode includes a plurality of types of print modes including a normal print mode and a high-definition print mode. The high-definition print mode is a print mode in which an image is printed at a second resolution, which is higher than the normal print mode in which an image is printed on the medium M at a first resolution.

A control unit 80 controls the recording head 27 , the carriage 28 and the transport mechanism 40 . The control unit 80 performs the transport operation of the medium M by the transport mechanism 40 and the scanning operation of the recording head 27 by the carriage 28 at the same time by partially overlapping the transport period FP of the transport operation and the scanning period SP of the scanning operation. Execute matching control. The control unit 80 does not execute the overlay control in the next transport by the transport mechanism 40 in which the leading edge of the medium M reaches the nip position of the discharge roller pair 61 while the overlay control is being performed. When the control unit 80 does not perform the overlay control, the control unit 80 waits until the leading edge of the medium M reaches the nip position of the discharge roller pair 61 to stop the conveying operation, and then starts the next scanning operation.

In the present embodiment, the control unit 80 controls, during the execution of the overlay control in the predetermined mode, the next transport by the transport mechanism 40 in which the leading edge of the medium M reaches the nip position of the discharge roller pair 61 . Do not perform alignment control. Here, the predetermined mode includes a head rubbing avoidance mode for avoiding rubbing between the recording head 27 and the medium M, or a high-definition mode for recording a high-resolution image on the medium M. FIG. In the next transport by the transport mechanism 40, the transport in which the leading edge of the medium M reaches the nip position of the discharge roller pair 61 means that the transport amount of the next transport is It refers to a transport amount that is greater than or equal to the transport amount required to reach the nip position.

The first counter 91 counts, for example, the number of pulse edges based on the pulse signal from the first encoder 67, and corresponds to the position of the carriage 28 (carriage position) in the scanning direction Y with the home position HP as the origin, for example. count the number of

The second counter 92 counts, for example, the number of pulse edges based on the pulse signal from the second encoder 68, thereby counting the count value corresponding to the transport position, which is the position of the leading edge of the medium M in the transport direction X. . The second counter 92 is reset, for example, when the transport sensor 73 detects the leading edge of the medium M, and counts the count value from the time when the transport sensor 73 detects the leading edge of the medium M as a starting point.

Based on the current transport position of the medium M determined from the count value of the second counter 92 and the transport amount instructed by the transport command instructing the next transport operation in the print data PD, the calculation unit 93 calculates the following: A transport position that the leading edge of the medium M reaches in the transport operation is calculated.

The determining unit 94 determines whether or not the leading edge of the medium M will enter the first discharge roller pair 61 in the next transporting operation based on the transport position that the leading edge of the medium M will reach in the next transporting operation calculated by the calculating unit 93 . determine whether Further, the determination unit 94 determines whether or not the downstream leading edge Ma of the medium M reaches the nip position of the first discharge roller pair 61 after being conveyed to reach the nip position of the first discharge roller pair 61 .

The control unit 80 determines that the leading edge of the medium M has reached the nip position of the first ejection roller pair 61 when the ejection sensor 74 detects the leading edge of the medium M. If the ejection sensor 74 does not detect the medium M after the next transportation is completed, even though the control unit 80 determines that the leading edge of the medium M reaches the position where the ejection sensor 74 detects it in the next transportation, It is determined that a jam of the medium M has occurred.

Here, superposition control executed by the control unit 80 in recording control will be described. FIG. 7 shows superposition control performed by the controller 80 in a mode other than the predetermined mode. The control unit 80 drives and controls the transport motor 66 and the carriage motor 49, and controls the transport operation of the medium M by the transport mechanism 40 and the scanning operation of the recording head 27 by the carriage 28 with the transport period FP of the transport operation and the scanning operation. are partially overlapped with the scanning period SP of . Specifically, the control unit 80 drives and controls the transport motor 66 and the carriage motor 49 at the timing shown in FIG. Execute superimposition control. Therefore, the driving of the carriage motor 49 is started in the middle of the deceleration process in which the transport motor 66 is decelerated, and the scanning operation of the recording head 27 is started in the middle of the deceleration process of the transport operation of the medium M. Further, the transport motor 66 starts to be driven in the middle of the deceleration process of the carriage motor 49, and the transport operation of transporting the medium M to the next recording position starts in the middle of the deceleration process of the scanning operation of the carriage 28. Due to the partial overlap between the transport period FP and the scanning period SP, the printing speed is increased by the overlapped period.

When the mode is other than the predetermined mode, the determination unit 94 makes the first determination at the first determination timing before the transport operation. In this first determination, it is determined whether or not the leading edge of the medium M reaches the detection area of the discharge sensor 74 in the next transport operation. Whether or not to perform overlay control in the next transport operation is determined according to the determination result of the first determination to be performed. Also, when it is determined in the first determination that the leading edge of the medium M reaches the detection area of the discharge sensor 74 in the next transport operation, the second determination is performed at the second determination timing after the next transport operation is completed. As shown in FIG. 7, if the detection state of the ejection sensor 74 is "medium present" in the second determination, the execution of the overlay control is continued. On the other hand, as shown in FIG. 8, if the detection state of the ejection sensor 74 is "no medium" in the second determination, the printing control is forced after the scanning operation of the printing head 27 by the carriage 28, which has already started, is completed. be stopped.

FIG. 9 shows superposition control performed by the controller 80 in the predetermined mode. The superposition control itself is the same as in FIG. 7 except for the predetermined mode. In the predetermined mode, in addition to the determination similar to the determination content of the first determination when the mode is other than the predetermined mode, the next transport operation is the transport operation in which the leading edge of the medium M enters the first discharge roller pair 61, that is, the second transport operation. It includes a determination as to whether or not a predetermined condition that the conveying operation reaches the nip position of one discharge roller pair 61 is satisfied. The determination unit 94 determines whether or not to perform superimposition control in the next transport operation according to the determination result of the first determination performed at the first determination timing before the transport operation.

As shown in FIGS. 9 and 10, if it is determined in the first determination that the leading edge of the medium M will enter the first discharge roller pair 61 in the next transport operation, the next transport operation is executed as shown in the same figures. Overlay control is not performed with . In addition, when it is determined in the first determination that the leading edge of the medium M reaches the detection area of the discharge sensor 74 in the next transport operation by the same determination as in the case other than the predetermined mode, the next transport operation is finished. A second determination similar to that in FIG. 7 is performed at the second determination time. Therefore, as shown in FIG. 9, if the detection state of the ejection sensor 74 is "medium present" in the second determination, the scanning operation of the recording head 27 by the carriage 28 is started after the next transport operation is completed. be. On the other hand, as shown in FIG. 10, if the detection state of the discharge sensor 74 is "no medium" in the second determination, the recording control is forcibly stopped without starting the next scanning operation of the recording head 27 by the carriage 28. be.

When the recording of the medium M is completed, the control unit 80 drives the driving mechanism 100 forward to transmit the driving force for conveying the medium M in the discharge direction to the first discharge roller pair 61 and the second discharge roller pair 62, thereby recording. The subsequent medium M is ejected. When the predetermined time to drive another mechanism comes, the control unit 80 reversely drives the drive mechanism 100 to transmit the driving force to the other mechanism, thereby driving the other mechanism. When maintenance time comes, the control unit 80 of the present embodiment reversely drives the driving mechanism 100 to drive the maintenance mechanism 75 which is one of the other mechanisms, thereby cleaning the recording head 27 . More specifically, the control unit 80 reversely drives the drive mechanism 100 in a capped state in which the carriage 28 is positioned at the home position HP and the nozzle opening surface 27A of the recording head 27 is covered with the cap 76, thereby rotating the suction pump. 79 is driven. As a result, the negative pressure is applied to the cap 76 by the suction pump 79 to forcibly suck the ink from the nozzles of the recording head 27 for cleaning. At this time, when the maintenance mechanism 75 is driven, the control unit 80 reversely drives the drive mechanism 100 in a state where the medium M is not detected by the discharge sensor 74 . When the discharge sensor 74 detects the medium M while the maintenance mechanism 75, which is one of the other mechanisms, is being driven by driving the drive mechanism 100 in reverse, the control unit 80 reversely drives the drive mechanism 100. stop. This is because the preceding medium M1 (see FIG. 21) that should have been ejected was in contact with the second ejection roller pair 62, and thus the second ejection roller pair 62 reverses when the maintenance mechanism 75 is driven. It is determined that the medium M has been detected abnormally, and the reverse driving of the drive mechanism 100 is stopped for emergency.

Next, operation of the recording device 11 will be described.
When receiving the print data PD and accepting the print job, the control unit 80 determines whether or not the predetermined mode is set based on the print condition information in the print data PD. The control unit 80 executes the recording control shown in FIG. 11 if the predetermined mode is not set. On the other hand, the control unit 80 executes the recording control shown in FIG. 12 in the predetermined mode. Here, the predetermined mode includes a "head rubbing avoidance mode" and a "high-definition print mode".

In the following, first, recording control in a mode other than the predetermined mode will be described. For example, this corresponds to the "normal print mode" when the "head rubbing avoidance mode" is not set.
The control unit 80 first drives the feeding motor 69 to feed the medium M from the cassette 19 or the supply tray 29, which is the designated medium supply source. For example, when the medium M is fed from the cassette 19, the feed motor 69 is driven forward to move the topmost medium M in the cassette 19 through the first transport path F1 by the rotation of the feed roller 33 and the separation roller 43. Further, the rotation of the two intermediate rollers 51 and 52 sends the medium M to the transport roller pair 60 via these outer peripheral surfaces. When the leading edge of the medium M is detected by the transport sensor 73, the second counter 92 counts the transport position, which is the position of the leading edge of the medium M, starting from this detection. Also, the medium M is conveyed to the print start position determined based on the recorded image data in the print data PD. After the leading edge of the medium M is detected by the conveying sensor 73, the recording head 27 prints for one scan (one pass) by one scan of the carriage 28, including the conveying operation in which the medium M is conveyed to the print start position. and the transport operation of transporting the medium M to the next recording position are alternately repeated, and recording control is performed to record an image on the medium M based on the print data PD.

Recording control executed by the control unit 80 in a mode other than the predetermined mode will be described below with reference to FIG. 11 .
First, in step S11, the control unit 80 determines whether or not the detection area of the ejection sensor 74 is reached in the next transport. If it is determined that the detection area of the ejection sensor 74 will not be reached in the next transportation, the process proceeds to step S12, and if it is determined that the detection area of the ejection sensor 74 will be reached in the next transportation, the process proceeds to step S13.

In step S12, the control unit 80 resets the flag F.
In step S13, the control unit 80 sets a flag F.
In step S14, the control unit 80 executes the transport operation by overlapping control. At this time, in the first transport operation for transporting the medium M to the print start position, the first scanning operation of the recording head 27 has not yet started, so the transport operation is performed without overlapping. Then, after the recording head 27 starts the first scanning operation, subsequent transport operations are performed by superposition control.

In step S15, the control unit 80 executes the scanning operation of the recording head 27 by the carriage 28 by overlay control. That is, the control unit 80 drives the carriage motor 49 to move the carriage 28 together with the recording head 27 in the scanning direction Y, and causes the recording head 27 during scanning to eject ink droplets from the nozzles, thereby performing one scan (one pass). minutes.

At step S16, the control unit 80 determines whether the flag F is reset. If the flag F is not reset, the process proceeds to step S17, and if the flag F is reset, the process proceeds to step S19.

In step S17, the control unit 80 determines whether or not the ejection sensor 74 is in the medium presence detection state. If the medium is not detected by the discharge sensor 74, that is, if the medium is not present, the process proceeds to step S18. On the other hand, if the detection state of the ejection sensor 74 indicates that the medium is present, the process proceeds to step S19.

At step S18, the controller 80 determines that a jam error has occurred. In other words, the control unit 80 determines that the medium M, which should have arrived after the medium M has been fed by the predetermined feed amount by the transport operation, has not reached the detection area of the discharge sensor 74, and the discharge sensor 74 detects that there is no medium. If so, it is determined that a jam error has occurred, assuming that a jam of the medium M has occurred during transportation.

For example, when the medium M is at the position indicated by the solid line as shown in FIG. 15 during execution of the overlay control, it is determined that the leading edge of the medium M will reach the detection area of the discharge sensor 74 in the next transport. do. In this case, in the next transport, the medium M is transported to the position shown in FIG. 17, and the ejection sensor 74 detects the medium M. However, if the ejection sensor 74 does not detect the medium M even after the next transport is completed, the control unit 80 determines that the medium M is jammed during the next transport (step S18). In this case, the recording device 11 is forcibly stopped.

At step S19 in FIG. 11, the control unit 80 determines whether printing is completed. If printing is not completed, the process returns to step S11, and the processes of steps S11 to S19 are repeated. When the printing instructed by the print job is completed, the recording control routine ends. Then, the control unit 80 drives the transport motor 66 to rotate forward and ejects the medium M on which printing is completed to the ejection tray 21 .

As shown in FIG. 7, in the recording control other than the predetermined mode, the control unit 80 controls the transporting operation of the medium M by the transporting mechanism 40 and the scanning operation of the recording head 27 by the carriage 28 in a transporting period FP and a scanning period. Superposition control is executed by partially superimposing SP and simultaneously. Specifically, the control unit 80 drives and controls the transport motor 66 and the carriage motor 49 at the timing shown in FIG. Execute superimposition control. Therefore, the driving of the carriage motor 49 is started in the middle of the deceleration process of the transport motor 66, and the scanning operation of the recording head 27 is started in the middle of the deceleration process of the transport operation. Further, the driving of the transport motor 66 is started in the middle of the deceleration process of the carriage motor 49, and the transport operation of the medium M is started in the middle of the deceleration process of the scanning operation of the recording head 27. FIG. Due to the partial overlap between the transport period FP and the scanning period SP, the printing speed is increased by the overlapped period.

In a mode other than the predetermined mode, a first determination is made at a first determination timing before the next transport operation is started to determine whether or not the next transport reaches the detection area of the discharge sensor 74 (step S11). Then, at the second determination time when the next transport is finished, the discharge sensor 74 makes a second determination whether or not the medium is present (step S17). If the second determination result is that the ejection sensor 74 has detected the medium M and "medium is present", the overlay control is continued as shown in FIG.

On the other hand, as shown in FIG. 8, if the ejection sensor 74 does not detect the medium M and the second determination result is "no medium" at the second determination timing after the next transport is completed, the jam error is recorded. Control is forcibly stopped. At this time, the next conveying operation is not performed, but since the carriage 28 has already started scanning under superposition control, the carriage 28 is stopped after completing one scanning. However, the control unit 80 monitors the load of the carriage motor 49, and if the load exceeds the threshold value due to a jam, the carriage 28 is forcibly stopped at that point even if the carriage 28 is in the middle of movement. Incidentally, the carriage 28 may be forcibly stopped at the time of judging the jam error.

Next, referring to FIG. 12, recording control in the predetermined mode will be described. Here, the predetermined mode includes a "head rubbing avoidance mode" and a "high-definition print mode". Recording control in the predetermined mode will be described below.

If the control unit 80 determines the predetermined mode based on the printing condition information in the print data PD, the control unit 80 executes the recording control shown in FIG. The control unit 80 first drives the feeding motor 69 to feed the medium M from the cassette 19, for example, and convey it to the pair of conveying rollers 60 via the first conveying path F1. When the leading edge of the medium M is detected by the transport sensor 73, the second counter 92 counts the transport position, which is the position of the leading edge of the medium M, starting from this detection. The medium M is transported to the print start position by the transport roller pair 60 . In this way, recording control including the transport operation to the recording start position is started.

First, in step S21, the control unit 80 determines whether or not the sheet will enter the discharge roller pair 61 in the next transport. That is, the control unit 80 determines whether or not the leading edge of the medium M reaches the nip position of the discharge roller pair 61 in the next transport. Specifically, the controller 80 compares the transport position calculated by the calculator 93 with the nip position of the first discharge roller pair 61, and if the transport position is the same as or past the nip position, the next It is determined that the leading edge of the medium M reaches the nip position of the discharge roller pair 61 during transport. If it is determined not to enter the discharge roller pair 61 in the next transport, the process proceeds to step S22, and if it is determined to enter the discharge roller pair 61 in the next transport, the process proceeds to step S23.

In step S22, the control unit 80 determines whether or not the detection area of the ejection sensor 74 is reached in the next transport. If it is determined that the detection area of the ejection sensor 74 will not be reached in the next transportation, the process proceeds to step S24, and if it is determined that the detection area of the ejection sensor 74 will be reached in the next transportation, the process proceeds to step S27.

In step S24, the control unit 80 resets the flag F.
In the next step S25, the control unit 80 executes the transport operation by overlapping control. At this time, in the first transport operation for transporting the medium M to the print start position, the recording head 27 has not yet started the first scanning operation, so the transport operation is performed without overlapping. Then, after the recording head 27 starts the first scanning operation, subsequent transport operations are performed by superposition control.

In the next step S26, the control section 80 executes the scanning operation of the recording head 27 by the carriage 28 by overlay control. That is, the control unit 80 drives the carriage motor 49 to move the carriage 28 together with the recording head 27 in the scanning direction Y, and causes the recording head 27 during scanning to eject ink droplets from the nozzles, thereby performing one scan (one pass). minutes. After finishing the process of step S26, it progresses to step S36. In this way, until the next transport does not enter the discharge roller pair 61 (negative determination in S21) and the next transport does not reach the detection area of the discharge sensor 74 (negative determination in S22), the superposition control is performed. will be For example, when the leading edge of the medium M is conveyed multiple times from the print start position until the leading edge of the medium M reaches the nip position of the first ejection roller pair 61, the leading edge of the medium M is positioned at the nip position of the first ejection roller pair 61. One or more transports and scans are performed with overlay control before reaching . It should be noted that in the present embodiment, the processing of steps S21, S25, and S26 corresponds to an example of the first control step.

On the other hand, if the controller 80 determines in step S22 that the detection area of the discharge sensor 74 will be reached in the next transport, flag F is set in step S27.
Further, in step S23, which is advanced when the control unit 80 determines in step S21 that the sheet will enter the discharge roller pair 61 in the next transport, the control unit 80 performs determination processing similar to that in step S22.

That is, in step S23, the control unit 80 determines whether or not the detection area of the ejection sensor 74 is reached in the next transport. If it is determined that the detection area of the ejection sensor 74 will not be reached in the next transportation, the process proceeds to step S28, and if it is determined that the detection area of the ejection sensor 74 will be reached in the next transportation, the process proceeds to step S29.

In step S28, the control unit 80 resets the flag F.
In step S29, the control unit 80 sets a flag F.
After finishing the processing of the flag F in steps S27, S28 and S29, the process proceeds to step S30 in any case.

At step S30, the control unit 80 executes a transport operation. At this time, the control unit 80 performs a transport operation without overlapping the medium M. FIG. After the scanning operation of the recording head 27 is started, the transport operation without overlapping is performed even in the next and subsequent transport operations. That is, the control unit 80 starts driving the transport motor 66 at the timing when the driving of the carriage motor 49 stops.

In the next step S31, the control unit 80 waits for the transportation to stop. That is, the control unit 80 waits until the transport operation is completed and the medium M stops. Specifically, the control unit 80 waits until the driving of the transport motor 66 stops for the transport operation.

At the next step S32, the control unit 80 determines whether or not the flag F is reset. If the flag F is not reset, the process proceeds to step S33, and if the flag F is reset, the process proceeds to step S35.

At step S33, the control unit 80 determines whether or not the ejection sensor 74 is in a medium presence detection state. If the medium is not detected by the discharge sensor 74, that is, if the medium is absent, the process proceeds to step S34. On the other hand, if the detection state of the discharge sensor 74 indicates that the medium is present, the process proceeds to step S35.

At step S34, the controller 80 determines that a jam error has occurred. In other words, the control unit 80 determines that the medium M that should have arrived after being fed by the predetermined feed amount by the transport operation has not reached the detection area of the ejection sensor 74, and the detection state of the ejection sensor 74 is not the medium. If not, it is determined that a jam error has occurred, assuming that a jam of the medium M occurred during transportation. In this case, recording control is forcibly stopped. At this time, the carriage 28 has not yet started scanning, so the controller 80 does not start driving the carriage motor 49 .

On the other hand, in step S<b>35 , the controller 80 causes the carriage 28 to scan the recording head 27 . This scanning operation is performed without superposition. That is, the control unit 80 starts driving the carriage motor 49 at the timing when the driving of the transport motor 66 is stopped. Printing for one scan (one pass) is performed by ejecting ink droplets from the nozzles during scanning by scanning the printing head 27 . Note that in the present embodiment, the processes of steps S21, S30, and S35 correspond to an example of the second control step.

In the next step S36, the control unit 80 determines whether printing is completed. If printing is not completed, the process returns to step S21, and the processes of steps S21 to S36 are repeated. When the printing instructed by the print job is completed, the recording control routine ends. Then, the control unit 80 drives the transport motor 66 to rotate forward and ejects the medium M on which printing is completed to the ejection tray 21 .

As shown in FIG. 9, in the recording control in the predetermined mode, the control unit 80 controls the transporting operation of the medium M by the transporting mechanism 40 and the scanning operation of the recording head 27 by the carriage 28 for the transporting period FP and the scanning period FP. Superposition control is executed by partially superimposing SP and simultaneously. Specifically, the control unit 80 drives and controls the transport motor 66 and the carriage motor 49 at the timing shown in FIG. 9, and performs superimposition control in which the transport period FP and the scanning period SP are partially overlapped and simultaneously performed. do. Therefore, the driving of the carriage motor 49 is started in the middle of the deceleration process of the transport motor 66, and the scanning operation of the recording head 27 is started in the middle of the deceleration process of the transport operation. Further, the driving of the transport motor 66 is started in the middle of the deceleration process of the carriage motor 49, and the transport operation of the medium M is started in the middle of the deceleration process of the scanning operation. Due to the partial overlap between the transport period FP and the scanning period SP, the printing speed is increased by the overlapped period.

In this predetermined mode, at the first determination timing before the start of the next transport operation, it is determined whether or not the discharge roller pair 61 is entered in the next transport (step S21), and the discharge sensor 74 is determined in the next transport. A first determination (steps S22 and S23) is performed, including determining whether or not the detection area is reached. Then, if the first determination result includes the determination result that the sheet will enter the discharge roller pair 61 in the next transport, the superposition control is not performed. That is, the next transport operation is performed without overlapping. Therefore, as shown in FIG. 9, the transport operation following the first determination time at which this determination result is obtained is performed so that the scanning period SP and the transport period FP do not overlap (steps S30, S31, S35). ).

For example, when the medium M is at the position indicated by solid lines in FIGS. When the leading edge Ma of the medium M reaches the nip position of the first ejection roller pair 61, the leading edge Ma of the medium M may reach the detection area of the ejection sensor 74 as shown in FIG.

In the case shown in FIG. 13, since the leading edge Ma of the medium M has not yet entered the first discharge roller pair 61 in the next transport, superposition control is performed. In this case, after the start of printing, until the leading edge Ma of the medium M reaches the nip position of the first discharge roller pair 61, superposition control of transport and scanning is performed one or more times.

As shown in FIGS. 14 and 15, when the leading edge of the medium M enters the first ejection roller pair 61 in the next transport, as shown in FIG. , the medium M momentarily bends and floats up. If the recording head 27 has already started scanning by overlay control when the medium M floats, the lifted portion of the medium M is likely to contact the nozzle opening surface 27A of the moving recording head 27 and rub against the nozzle opening surface 27A. In particular, if the medium M is made of a flexible material or has a small thickness, the floating amount of the medium M tends to increase, and the medium M tends to rub against the nozzle opening surface 27A of the recording head 27 during movement. The rubbing between the medium M and the recording head 27 causes ink stains on the medium M and may also damage the recording head 27 .

However, in the present embodiment, as shown in FIG. 16, even if the leading edge of the medium M floats momentarily when it enters the first discharge roller pair 61, the stacking control is not performed at that time, so the medium M is moved to the floated medium M. Rubbing caused by contact with the nozzle opening surface 27A of the recording head 27 inside does not occur.

That is, in the case shown in FIGS. 14 and 15, the leading edge Ma of the medium M enters the first discharge roller pair 61 in the next transport, so the next transport operation is performed without superposition control. That is, the carriage 28 is started to be driven after the medium M that has been conveyed to the position indicated by the two-dot chain line in FIGS. 14 and 15 stops. When the medium M is lifted, the recording head 27 is stopped at the position before scanning is started. inside. Therefore, as shown in FIG. 16, when the leading edge Ma of the medium M enters the first discharge roller pair 61, even if the medium M bends for a moment and floats up, the recording head 27 does not stop at the position before the start of scanning. Therefore, head rubbing of the medium M is avoided. It should be noted that even if the next transport is carried by a transport amount in which the leading edge of the medium M just reaches the nip position, the leading edge of the medium M when entering the first discharge roller pair 61 is shifted vertically from the nip position. , the medium M bends and floats. Even when this type of medium M floats, friction between the medium M and the nozzle opening surface 27A is avoided.

Further, when it is determined in the first determination that the leading edge of the medium M reaches the detection area of the discharge sensor 74 (affirmative determination in steps S22 and S23), as shown in FIG. At the determination timing, a second determination is made to determine whether or not the ejection sensor 74 is in the medium presence detection state (step S33). If the second determination result is "medium present", as shown in FIG. 9, overlay control is resumed in subsequent scanning operations and transport operations. As shown in FIG. 15, when it is determined that the leading edge Ma of the medium M reaches the detection area of the discharge sensor 74 in the next transport, as shown in FIG. When the medium M that has been transported is detected by the ejection sensor 74, the overlay control that was temporarily stopped during the previous transport operation is resumed (see FIG. 9).

On the other hand, as shown in FIG. 10, if the ejection sensor 74 does not detect the medium M at the second determination timing after the next transport operation is completed and the second determination result is "no medium", it is determined that there is a jam error. (step S34), and the recording control is forcibly stopped at that time. At this time, since the next scanning operation has not yet started, print control is immediately forcibly stopped without starting the next scanning operation (see FIG. 10). In the case of a negative determination in step S21 and an affirmative determination in step S22, the leading edge of the medium M has already passed the nip position of the first discharge roller pair 61, and the next transport is performed. corresponds to the case where the leading edge of the medium M does not reach the detection area of the discharge sensor 74 . In this case, the leading edge of the medium M has not yet reached the detection area of the discharge sensor 74, and there is no confirmation that the medium M has not jammed, so the superposition control is not performed (steps S30, S31, S35). . However, although the leading edge of the medium M has not yet reached the detection area of the ejection sensor 74, the medium M that has already entered the first ejection roller pair 61 is in a state of being nipped by the first ejection roller pair 61. , superposition control (steps S25 and S26). In this case, it is preferable to perform the second determination process (steps S32 to S34) at the second determination time after steps S25 and S26.

Further, as shown in FIG. 18, during double-sided printing, the medium M whose first side has been recorded by the recording unit 26 is transported in the second transport direction X2 opposite to the first transport direction X1, which is the transport direction up to that point. transported back to For example, when the trailing edge Mb of the medium M has not yet passed through the detection area of the transport sensor 73 in the first transport direction X1 and the transport sensor 73 is in the detection state when the recording of the first surface is completed, the medium M is positioned at the trailing edge. After Mb is once discharged in the first transport direction X1 to a position where it is detected by the transport sensor 73, it is reversely transported. The reversely conveyed medium M is sent from the third conveying path F3 to the fourth conveying path F4. In this way, the medium M is switchback-conveyed with conveyance and reverse conveyance during double-sided printing.

After the switchback, the medium M is reversely transported in the second transport direction X2 along the fourth transport path F4 along a path passing under the two intermediate rollers 51 and 52, and then transported along the first transport path F1 by the first intermediate roller 51. is inverted along the outer peripheral surface of the After being reversed, the medium M is transported toward the recording section 26 with the second surface opposite to the first surface on which the recording has been completed facing upward. After printing on the second surface of the medium M by the recording unit 26 , the medium M on which both sides have been printed is discharged onto the discharge tray 21 . Also during printing on the second surface, the control unit 80 controls the recording shown in FIG. control.

By the way, as indicated by the chain double-dashed line in FIG. 19, if the preceding medium M1 ejected earlier is in contact with the outside of the nip position of the second ejection roller pair 62, etc., the first surface of the medium M1 has been completely printed. The preceding medium M1 may be pulled back into the housing 12 as indicated by the solid line in FIG. After the ejection sensor 74 detects the trailing edge (leading edge Ma) of the medium M in the reverse transport direction during the reverse driving of the drive mechanism 100, when the ejection sensor 74 again detects the leading medium M1 indicated by the solid line in FIG. Stop the reverse drive of 100. Therefore, the preceding medium M1 that should have been ejected comes into contact with the second ejection roller pair 62, and in the process of reversely transporting the medium M, the preceding medium M1 is reversely transported by the reverse rotation of the second ejection roller pair 62 and upstream. , the drive mechanism 100 is stopped when the ejection sensor 74 detects the preceding medium M1. As a result, the pull-back amount of the preceding medium M1 is reduced. Therefore, the user can relatively easily remove the medium M1 that has been pulled back.

As shown in FIG. 20, after the discharge sensor 74 detects the preceding medium M1 that has been pulled back and the reverse driving of the driving mechanism 100 is stopped, the detection result of the conveyance sensor 73 indicates that the medium M is conveyed in the reverse direction. The rear end (front end Ma) in the second transport direction X2 may pass the nip position of the transport roller pair 60 upstream. In this case, since the drive source for the transport mechanism 40 and the drive source for the first feeding section 31 are separate motors 66 and 69, the roller pairs 60 to 62 are moved forward in the direction indicated by the two-dot chain line arrows shown in FIG. Even if the intermediate rollers 51 and 52 (see FIG. 3) are rotated in the normal direction, the reverse transport of the medium M can be continued. Therefore, if the trailing end of the medium M in the second transport direction X2 has passed upstream of the nip position of the pair of transport rollers 60 from the detection result of the transport sensor 73, the drive mechanism 100 is driven forward to rotate as shown in FIG. , the three roller pairs 60 to 62 are rotated forward, and the preceding medium M1 that has been pulled back is ejected again. In this case, an emergency stop of the recording device 11 can be avoided. Therefore, it is possible to avoid a situation in which the recording apparatus 11 is stopped in an emergency and the recording is interrupted, and the user is forced to solve the trouble of pulling back the preceding medium M1.

Further, when maintenance time comes, the control unit 80 drives the maintenance mechanism 75 by reverse driving the drive mechanism 100 . When driving the maintenance mechanism 75, the control unit 80 reversely drives the driving mechanism 100 in a state in which the discharge sensor 74 does not detect the preceding medium M1. For example, the preceding medium M1 remains around the inner side of the discharge port 20, or the preceding medium M1 remains in the third conveying path F3 at the time of forced stop such as jam detection. The maintenance mechanism 75 is not driven while the medium M1 is being detected. Therefore, the preceding medium M1 is prevented from being pulled back into the housing 12 by the second discharge roller pair 62 that is reversely driven together with the drive mechanism 100 that is reversely driven to drive the maintenance mechanism 75. .

As shown in FIG. 21, when the ejection sensor 74 detects the preceding medium M1 during the driving after starting the reverse driving of the driving mechanism 100 at the maintenance timing and the driving of the maintenance mechanism 75 is started, the driving mechanism 100 is rotated in the reverse direction. Stop driving. Therefore, when the preceding medium M1 is pulled back into the housing 12 by the reverse rotation of the second discharge roller pair 62 after the maintenance mechanism 75 starts to be driven, the reverse driving of the driving mechanism 100 is stopped, and the driving of the maintenance mechanism 75 is stopped. be done. As a result, the pullback amount of the preceding medium M1 that has been pulled back is suppressed. Therefore, the user can relatively easily remove the preceding medium M1 that has been pulled back.

It should be noted that the drive mechanism 100 does not detect the preceding medium M1 because the discharge sensor 74 is in a state of detecting the preceding medium M1 during the maintenance period or the discharge sensor 74 detects the preceding medium M1 while the maintenance mechanism 75 is being driven during the maintenance period. is stopped, the drive mechanism 100 may be driven forward in order to eject the preceding medium M1 that has been detected. In this case, as shown in FIG. 21, the three roller pairs 60 to 62 rotate forward in the directions indicated by two-dot chain arrows in FIG. The preceding medium M1 that has been picked up is ejected. After the discharge sensor 74 stops detecting the preceding medium M1 and the forward rotation of the roller pairs 60 to 62 is sufficient to discharge the preceding medium M1 to the discharge tray 21, the driving mechanism 100 start reverse drive. In this case, the preceding medium M1, which is the cause of not being able to start the maintenance operation, can be removed from the conveying path, so the maintenance operation can be performed without emergency stop of the recording apparatus 11. FIG. Therefore, the preceding medium M1 remains in the housing 12 and the maintenance operation is not performed, or the once started maintenance operation is interrupted by an emergency stop caused by the pulled-back preceding medium M1. , and the situation in which the user is forced to remove the previous medium M1 left in the housing 12 or the previous medium M1 that has been pulled back can be avoided.

According to the above embodiment, the following effects can be obtained.
(1) The recording apparatus 11 includes a recording head 27 that performs recording on the medium M, a carriage 28 that carries the recording head 27 and is scanned, and a carriage 28 that is arranged downstream of the recording head 27 so that the medium M faces the recording head 27. and a control unit 80 for controlling the recording head 27 , the carriage 28 and the transport mechanism 40 . The control unit 80 controls the recording head 27, the carriage 28, and the transport mechanism 40, and the transport operation of the medium M by the transport mechanism 40 and the scanning operation of the recording head 27 by the carriage 28 are performed during the transport period FP of the transport operation and the scanning operation. Overlay control is performed by partially overlapping with the scanning period SP of the operation. Further, the control unit 80 does not execute the superposition control in the next transport by the transport mechanism 40 in which the leading edge of the medium M reaches the nip position of the discharge roller pair 61 . Therefore, even if the medium M bends and floats when the leading edge of the medium M enters the discharge roller pair 61, the recording head 27 is often stopped at the position before the start of scanning. Therefore, it is possible to reduce the friction between the floating portion of the medium M and the recording head 27 . In addition, since the transportation and scanning before the leading edge of the medium M reaches the nip position of the discharge roller pair 61 are performed by superposition control, the recording speed can be increased. Therefore, it is possible to reduce the friction between the medium M and the recording head 27 while maintaining a high recording throughput.

(2) The control unit 80 waits until the leading edge of the medium M reaches the nip position of the discharge roller pair 61 to stop the transport operation and then starts the next scanning operation in the transport operation that does not perform the overlay control. Therefore, it is possible to more reliably prevent the medium M from rubbing against the recording head 27 .

(3) Overlay control is performed once or more before the leading edge of the medium M reaches the nip position of the discharge roller pair 61 . Therefore, the overlay control that is performed one or more times before the leading edge of the medium M reaches the nip position of the discharge roller pair 61 can contribute to an improvement in printing throughput.

(4) The control unit 80 performs the overlay control in the next transport by the transport mechanism 40 when the leading edge of the medium M reaches the nip position of the discharge roller pair 61 during the execution of the overlay control in the predetermined mode. don't run Therefore, in a predetermined mode in which it is particularly desirable to avoid rubbing between the medium M and the recording head 27, rubbing between the recording head 27 and the medium M caused by floating of the medium M when the leading edge of the medium M enters the ejection roller pair 61 is avoided. , a recorded matter with high recording quality can be obtained.

(5) The control unit 80 determines whether or not the downstream end of the medium M has reached the nip position of the discharge roller pair 61 after being transported to reach the nip position of the discharge roller pair 61 . Therefore, it is determined whether or not the downstream end of the medium M has reached the nip position of the discharge roller pair 61 after being transported to reach the nip position of the discharge roller pair 61. Therefore, a transport abnormality such as a jam during transport can be detected. can.

(6) A discharge sensor 74 provided downstream of the discharge roller pair 61 is provided. The controller 80 determines that the leading edge of the medium M has reached the nip position of the ejection roller pair 61 when the ejection sensor 74 detects the leading edge of the medium M. FIG. Therefore, the ejection sensor 74 located downstream of the ejection roller pair 61 can reliably detect that the leading edge of the medium M has reached the nip position of the ejection roller pair 61 . Therefore, it is possible to more reliably detect transport abnormalities such as jams during transport.

(7) A drive mechanism 100 that drives the first discharge roller pair 61 and a second discharge roller pair 62 that is driven by the drive mechanism 100 and provided downstream of the discharge sensor 74 . Therefore, even when the medium M reaches the nip position of the discharge roller pair 61 but does not reach the downstream second discharge roller pair 62, the discharge sensor 74 can reliably detect that the conveyance has ended correctly. .

(8) The drive mechanism 100 transmits the driving force for conveying the medium M in the ejection direction to the ejection roller pair 61 and the second ejection roller pair 62 by forward rotation, and the maintenance mechanism 75 as an example of another mechanism by reverse rotation. It is possible to transmit the driving force to When driving the maintenance mechanism 75 , the control unit 80 reversely drives the drive mechanism 100 in a state where the medium M is not detected by the discharge sensor 74 .

Therefore, the maintenance mechanism 75 is driven by driving the driving mechanism 100 in reverse while the discharge sensor 74 does not detect the medium M. That is, when the ejection sensor 74 detects the medium M, the maintenance mechanism 75 is not driven. Therefore, it is possible to prevent the medium M from being pulled back into the housing 12 by the second discharge roller pair 62 that is reversely driven together with the drive mechanism 100 that is reversely driven to drive the maintenance mechanism 75 .

(9) When the ejection sensor 74 detects the medium M, the reverse drive of the drive mechanism 100 is stopped. Therefore, when the preceding medium M1 is pulled back into the housing 12 by the reverse rotation of the second discharge roller pair 62 after the maintenance mechanism 75 starts to be driven, the reverse driving of the driving mechanism 100 is stopped, and the driving of the maintenance mechanism 75 is stopped. Therefore, the retracted amount of the retracted medium M can be reduced.

(10) When the discharge sensor 74 detects the medium M, the driving mechanism 100 stops rotating in the reverse direction, and then drives the driving mechanism 100 in the forward direction. Therefore, the preceding medium M1 that has been pulled back can be ejected again. For example, it is possible to avoid a situation in which the user is forced to work to solve the trouble of pulling back the preceding medium M1.

(11) The drive mechanism 100 is capable of transporting the medium M in the direction of ejection by forward rotation, and transporting the medium M in the direction opposite to the ejection direction by driving in the reverse direction. After the ejection sensor 74 detects the rear end (leading edge Ma) of the medium M in the reverse direction during the reverse rotation, when the ejection sensor 74 detects the medium M again, the reverse rotation of the drive mechanism 100 is stopped. Therefore, if the preceding medium M1 that should have been discharged is in contact with the second discharge roller pair 62, the preceding medium M1 is reversely conveyed by the reverse rotation of the second discharge roller pair 62 during the reverse conveyance process of the medium M. may be pulled back. Even in such a case, the reverse driving of the drive mechanism 100 is stopped when the ejection sensor 74 detects the trailing end (leading edge Ma) of the medium M in the reverse direction and then detects the medium M1 again. Therefore, even if the preceding medium M1 is pulled back upstream by the reverse rotation of the second discharging roller pair 62 when the first discharging roller pair 61 is reversely driven for reverse conveyance of the medium M, the amount of pullback of the preceding medium M1 is can be kept to a minimum.

(12) After the reverse driving of the drive mechanism 100 is stopped, if the trailing end (leading end Ma) of the second transport direction X2, which is the reverse transport direction of the medium M, has passed the nip position of the transport roller pair 60 upstream, the drive mechanism 100 is driven forward. Therefore, the preceding medium M1 that has been pulled back can be ejected again. For example, it is possible to avoid a situation in which the recording is interrupted by emergency stop of the recording apparatus 11, and the user is forced to solve the trouble of pulling back the preceding medium M1.

(13) The predetermined mode includes a head rubbing avoidance mode for avoiding rubbing between the recording head 27 and the medium M, or a normal print mode for recording an image on the medium M at a first resolution, and printing an image at a second resolution higher than that of the normal print mode. Includes high-definition print mode to record. Therefore, in the head rubbing avoidance mode or the high-definition printing mode, it is possible to avoid rubbing between the medium M and the recording head 27 and obtain a high-quality printed image with little dirt.

(14) The recording apparatus 11 includes a recording head 27 that performs recording on the medium M, a carriage 28 that carries the recording head 27 and is scanned, and a carriage 28 that is arranged downstream of the recording head 27 so that the medium M faces the recording head 27. and a control unit 80 for controlling the recording head 27 , the carriage 28 , and the transport mechanism 40 . The control unit 80 executes superimposition control in which a part of the transport period FP of the medium M by the transport mechanism 40 and the scanning period SP of the recording head 27 by the carriage 28 are performed simultaneously. In this control method of the recording apparatus 11, if the next transport by the transport mechanism 40 during execution of the overlay control is before the transport in which the leading edge of the medium M reaches the nip position of the discharge roller pair 61, It includes a first control step (S25, S26) in which the next transport operation is carried out under superposition control. Furthermore, if the next transport by the transport mechanism 40 is transport in which the leading edge of the medium M reaches the nip position of the discharge roller pair 61 during execution of the superimposition control, the superimposition control is stopped for the next transport operation. A second control step (S30, S35) is included in which the transport period FP and the scanning period SP are controlled so as not to overlap each other. Therefore, according to the control method of the recording apparatus 11, the same effect as the above (1) in the recording apparatus 11 can be obtained.

It should be noted that the above-described embodiment can be modified into a form such as the modified example shown below. Furthermore, a further modified example can be obtained by appropriately combining the above-described embodiment and the modified examples described below, or a further modified example can be obtained by appropriately combining the modified examples described below.

In the transport operation that does not reach the detection area of the ejection sensor 74, the medium M is transported by the position of the leading edge of the medium M grasped by the count value of the second counter 92 and the transport amount instructed in the current transport operation. If it is determined that the position of the calculated leading edge that is reached at the time of recording does not match within the allowable range, it may be determined that a jam error has occurred, and the recording operation may be forcibly stopped. Alternatively, the load of the transport motor 66 may be detected, and when the load exceeds a predetermined threshold, it may be determined as a jam error and the recording operation may be forcibly stopped. According to these configurations, it is possible to forcibly stop the recording operation by detecting a jam at an early stage of transportation before the leading edge of the medium M reaches the discharge sensor 74 . For example, even though a jam has occurred, the scanning of the carriage 28 and the transport of the medium M are performed, and the jam becomes severe, which makes the work for clearing the jam troublesome, and damage to the recording head 27 can be avoided.

A configuration may be adopted in which the overlap control is not performed in the transport operation when the trailing edge Mb of the medium M passes the nip position of the transport roller pair 60 . When the trailing edge Mb of the medium M passes the nip position of the pair of transport rollers 60, the trailing edge of the medium M may be kicked off by the pair of transport rollers 60 or may be lifted temporarily by reaction when the nip is disengaged. , the scanning of the carriage 28 is started after the conveying operation is finished without performing the overlay control and the medium M is stopped. In this way, in the transport operation in which the leading edge of the medium M reaches the nip position of the first discharge roller and the transport operation in which the trailing edge Mb of the medium M passes the nip position of the transport roller pair 60, the overlap control is temporarily performed. By interrupting the recording, it is possible to further prevent the medium M from rubbing against the recording head 27 .

The configuration is not limited to the one in which the superimposition control is not performed for all transport operations in which the leading edge of the medium M enters the ejection roller pair 61 . For example, when the leading edge of the medium M reaches the detection area of the ejection roller pair 61 and the ejection sensor 74, which is an example of the detection unit, after the ejection sensor 74 detects the leading edge of the medium M, the overlapping Scanning of the recording head 27 by the carriage 28 under control may be started. This is because if the leading edge of the medium M reaches the detection area of the discharge sensor 74 located downstream of the discharge roller pair 61, the temporary lifting of the medium M when entering the discharge roller pair 61 is eliminated. because it is assumed that Further, if the transport position of the medium M obtained from the count value of the second counter 92 is transported to the transport position at the timing at which the leading edge Ma of the medium M enters the first discharge roller pair 61 and the floating is eliminated. , the scanning of the recording head 27 by the carriage 28 in superposition control may be started. According to these configurations, even when the medium M rushes into the first discharge roller pair 61, after a predetermined time has elapsed since the medium M entered, or after the medium M has been conveyed by a predetermined amount after entering. After the temporary floating of the medium M is resolved, the printing speed can be increased by executing the overlay control. If the distance between the nip position of the first discharge roller pair 61 and the position of the detection area of the discharge sensor 74 on the transport path is extremely short, after the detection of the medium M and after counting the transport of the medium M by a predetermined amount, It is preferable to allow the start of overlay control.

The control that does not perform superimposition control consists of a control that waits for the previous scanning operation of the carriage 28 to stop before starting the target transport operation, and a control that waits for the target transport operation to stop before starting the next scanning operation of the carriage 28 . Including, but not limited to, both starting and controlling. Only one of control to start the target transport operation after the previous scanning operation of the carriage 28 has stopped and control to wait for the target transport operation to stop and then start the next scanning operation of the carriage 28. may be configured so as not to perform

The number of discharge roller pairs located downstream of the recording position may be one. Also, three or more discharge roller pairs may be provided.
The discharge sensor 74 , which is an example of a detection unit, may be arranged upstream of the first discharge roller pair 61 as long as it is downstream of the recording position facing the recording head 27 . Also, the discharge sensor 74 may be arranged at a position downstream of the second discharge roller pair 62 . When the ejection sensor 74 is provided downstream of the second ejection roller pair 62, the distance along the path downstream from the recording position is within the range where the recording head 27 can detect the medium M being recorded. Preferably, an exhaust sensor 74 is provided at the . These configurations can also detect a jam of the medium M during recording.

- The medium M is not limited to paper, and may be a flexible plastic film, cloth, non-woven fabric, or the like.
The recording apparatus 11 is not limited to a liquid ejection method such as an inkjet method, and may be a dot impact method or an electrophotographic method. Also, the recording device 11 may be a textile printing device.

Technical ideas understood from the above-described embodiment and modified examples are described below together with their effects.
A printing apparatus includes a print head that prints on a medium, a carriage that carries and scans the print head, and a pair of ejection rollers that are arranged downstream of the print head and eject the medium from a position facing the print head. , the recording head, the carriage, and the transport mechanism, and a transport operation of the medium by the transport mechanism and a scanning operation of the recording head by the carriage are performed by a transport period of the transport operation and the and a control unit that executes superimposition control that is performed simultaneously with a scanning period of a scanning operation, and the control unit controls, during execution of the superimposition control, the medium during the next transport by the transport mechanism. When the leading edge of the sheet reaches the nip position of the pair of discharge rollers, the superposition control is not executed.

According to this configuration, the overlap control is not executed when the leading edge of the medium reaches the nip position of the ejection roller pair. At that time, the recording head frequently stops at the position before the start of the next scan. Therefore, it is possible to reduce the friction between the floating portion of the medium and the print head. In addition, before the leading edge of the medium M reaches the nip position of the pair of discharge rollers, the recording speed can be increased because the transportation and scanning are performed by superposition control. Therefore, it is possible to reduce friction between the medium and the print head while maintaining a high print throughput.

In the recording apparatus, the control unit waits until the leading edge of the medium reaches the nip position between the pair of discharge rollers and then starts the next scanning operation in the transport operation in which the overlap control is not executed. do it.

According to this configuration, the next scanning operation is started after waiting for the leading end of the medium to reach the nip position of the discharge roller pair, and then the next scanning operation is started. .

In the recording apparatus described above, the superposition control is preferably performed once or more before the leading edge of the medium reaches the nip position of the discharge roller pair.
According to this configuration, it is possible to contribute to the improvement of the throughput of recording by the overlay control that is performed one or more times before the leading edge of the medium reaches the nip position.

In the above-described recording apparatus, when superposition control is performed in a predetermined mode, the control unit controls the superimposition control when the leading edge of the medium reaches the nip position of the discharge roller pair in the next transfer by the transfer mechanism. You don't have to run the control.

According to this configuration, in a predetermined mode in which it is desirable to avoid rubbing between the medium and the recording head, it is possible to avoid rubbing against the recording head due to the floating of the medium when the leading edge of the medium reaches the nip position of the discharge roller pair. , a recorded matter with high recording quality can be obtained.

In the above recording apparatus, the control unit may determine whether or not the downstream leading edge of the medium has reached the nip position between the pair of discharge rollers after the medium has been conveyed to reach the nip position between the pair of discharge rollers.

According to this configuration, it is determined whether or not the downstream edge of the medium has reached the nip position of the pair of discharge rollers after the medium is conveyed to reach the nip position of the pair of discharge rollers. detectable.

In the above-described recording apparatus, a detection unit is provided downstream of the discharge roller pair, and the control unit causes the detection unit to detect the leading edge of the medium so that the leading edge of the medium is positioned at the nip position of the ejection roller pair. You can judge that you have arrived.

According to this configuration, it is possible to reliably detect that the leading edge of the medium has reached the nip position between the pair of ejection rollers by the detecting section located downstream of the pair of ejection rollers. Therefore, it is possible to more reliably detect conveyance abnormalities such as jams during conveyance.

The recording apparatus may further include a drive mechanism for driving the pair of discharge rollers, and a second pair of discharge rollers driven by the drive mechanism and provided downstream of the detector.
According to this configuration, even when the medium reaches the nip position of the discharge roller pair but does not reach the downstream second discharge roller pair, it is possible for the detection unit to reliably detect that the conveyance has ended correctly. can.

In the above recording apparatus, the drive mechanism transmits a driving force for conveying the medium in the ejection direction to the pair of discharge rollers and the second pair of discharge rollers by driving forward, and transmits the driving force to another mechanism by driving in reverse. It is possible, and when driving the other mechanism, the control unit may reversely drive the drive mechanism in a state in which the detection unit does not detect the medium.

According to this configuration, the other mechanism is driven by driving the driving mechanism in reverse while the detecting section does not detect the medium. In other words, other mechanisms are not driven while the detection unit detects the medium. Therefore, it is possible to avoid a situation in which the medium is pulled back by the second discharge roller pair that is reversely driven together with the drive mechanism that is reversely driven to drive another mechanism.

In the recording apparatus described above, the reverse driving of the driving mechanism may be stopped when the detecting section detects the medium.
According to this configuration, when the preceding medium is pulled in by the reverse rotation of the second discharge roller pair after the drive of the other mechanism is started, the reverse drive of the drive mechanism is stopped, so the amount of retraction of the medium can be reduced.

In the recording apparatus described above, the drive mechanism is capable of transporting the medium in the direction of ejection by forward rotation and transporting the medium in the direction opposite to the ejection direction of the medium by driving in the reverse direction. After detecting the trailing edge of the medium in the reverse direction, the reverse driving of the driving mechanism may be stopped when the detecting section detects the medium again.

According to this configuration, if the preceding medium that should have been ejected is in contact with the second ejection roller pair, the preceding medium is reversely transported by the reverse rotation of the second ejection roller pair during the reverse transport process of the medium. You may be pulled back. Even in such a case, the reverse driving of the driving mechanism is stopped when the detection unit detects the medium again after detecting the trailing edge in the reverse direction of the medium being reversely transported. Therefore, even if the preceding medium is pulled back upstream due to the reverse rotation of the second discharge roller pair when the first discharge roller pair is reversely driven for reverse conveyance of the medium, the pullback amount of the preceding medium can be kept small. .

In the above-described recording apparatus, the predetermined mode is a head rubbing avoidance mode in which recording is performed with a second gap larger than the first gap when the mode is not selected, or a head rubbing avoidance mode in which recording is performed with a gap between the recording head and the medium that is not selected. It is preferable to include a high-definition print mode that prints images at a second resolution higher than the normal print mode that prints images at one resolution.

According to this configuration, in the head rubbing avoidance mode or the high-definition printing mode, it is possible to avoid rubbing between the medium and the recording head and obtain a high-quality printed image with little dirt.
A control method of a printing apparatus includes a print head for printing on a medium, a carriage mounted with the print head and scanned, and a medium disposed downstream of the print head and ejecting the medium from a position facing the print head. A transport mechanism including a pair of discharge rollers, the recording head, the carriage, and the transport mechanism are controlled, and part of a period during which the transport mechanism transports the medium and a period during which the carriage scans the recording head are performed simultaneously. a control unit that executes superimposition control, and during execution of the superimposition control, the next transport by the transport mechanism is the transport before the transport in which the leading edge of the medium reaches the nip position of the discharge roller pair. If there is, a first control step of performing the next transport by the superimposition control, and during execution of the superimposition control, the next transport by the transport mechanism is performed so that the leading edge of the medium is at the nip position of the discharge roller pair. a second control step of stopping the superimposition control and performing the next transport under control in which the transport period and the scanning period do not overlap, if the transport reaches. According to this method, the same effect as that of the above recording apparatus can be obtained.

DESCRIPTION OF SYMBOLS 11... Recording device 12... Housing 13... Reading device 26... Recording part 27... Recording head 27A... Nozzle opening surface 28... Carriage 30... Conveying part 31... First feeding part 32... Second feeding unit 33 Feed roller 40 Conveying mechanism 41 Support base 42 Guide shaft 43 Separation roller 49 Carriage motor 51 First intermediate roller 52 Second intermediate roller , 60... conveying roller pair, 61... first discharging roller pair as an example of the discharging roller pair, 62... second discharging roller pair, 66... conveying motor, 67... first encoder, 68... second encoder, 69... feeding Feeding motor 71 Feeding sensor 72 Intermediate sensor 73 Conveying sensor 74 Discharge sensor as an example of detection unit 75 Maintenance mechanism as an example of another mechanism 80 Control unit 81 Computer , 82... memory, 100... drive mechanism, 101... gear mechanism, 102... gear mechanism, 103... gear mechanism, D... manuscript, M... medium, M1... preceding medium, Ma... front end (rear end in opposite direction), Mb... trailing edge, F0... conveying path, F1... first conveying path, F2... second conveying path, F3... third conveying path, FP... conveying period, SP... scanning period, X... conveying direction, X1... first Conveying direction, X2... second conveying direction (an example of the opposite direction), Y... width direction (scanning direction), Z... vertical direction.

Claims (12)

a recording head for recording on a medium;
a carriage mounted with the recording head and scanned;
a conveying mechanism including a pair of discharge rollers arranged downstream of the recording head and discharging the medium from a position facing the recording head;
The recording head, the carriage, and the transport mechanism are controlled, and a medium transport operation by the transport mechanism and a scanning operation of the recording head by the carriage are separated into a transport period of the transport operation and a scanning period of the scanning operation. and a control unit that executes superimposition control that partially overlaps and simultaneously performs
When the controller determines that the leading edge of the medium reaches the nip position of the discharge roller pair in the next transport before the next transport by the transport mechanism during execution of the superimposition control , A printing apparatus characterized in that the superposition control is not executed in the next transport. The controller waits until the leading edge of the medium reaches the nip position between the pair of discharge rollers to stop the transport operation, and then starts the next scanning operation. 2. The recording apparatus according to claim 1, wherein: 3. The recording apparatus according to claim 1, wherein the superposition control is performed once or more before the leading edge of the medium reaches the nip position of the discharge roller pair. When the superimposition control is performed in the predetermined mode, the control unit does not perform the superimposition control in the next transport by the transport mechanism in which the leading edge of the medium reaches the nip position of the discharge roller pair. 4. The recording apparatus according to any one of claims 1 to 3, characterized by: 5. The method according to claim 4, wherein the control unit determines whether or not the downstream edge of the medium has reached the nip position of the pair of discharge rollers after the medium is conveyed to reach the nip position of the pair of discharge rollers. Recording device as described. A detection unit provided downstream of the pair of discharge rollers,
6. The recording apparatus according to claim 5, wherein the control section determines that the leading edge of the medium has reached the nip position of the discharge roller pair when the detecting section has detected the leading edge of the medium. 7. A recording apparatus according to claim 6, further comprising a drive mechanism for driving said discharge roller pair, and a second discharge roller pair driven by said drive mechanism and provided downstream of said detector. The drive mechanism is capable of transmitting driving force for conveying the medium in the discharge direction to the pair of discharge rollers and the second pair of discharge rollers by forward rotation driving, and transmitting driving force to another mechanism by reverse driving,
8. The recording apparatus according to claim 7, wherein, when driving the other mechanism, the control section reversely drives the drive mechanism in a state in which the detection section does not detect the medium. 9. The recording apparatus according to claim 8, wherein the reverse driving of the drive mechanism is stopped when the detection unit detects the medium. The drive mechanism is capable of transporting the medium in the direction of ejection by forward rotation and transporting the medium in the direction opposite to the direction of ejection by reverse rotation. 10. The recording apparatus according to any one of claims 7 to 9, wherein the reverse driving of the driving mechanism is stopped when the detecting section detects the medium again after detecting the trailing edge of the recording medium. The predetermined mode is a head rubbing avoidance mode in which recording is performed with a second gap larger than the first gap when the recording head and the medium are not selected, or an image is recorded on the medium at a first resolution. 11. The recording apparatus according to any one of claims 4 to 10, further comprising a high-definition print mode for recording an image at a second resolution higher than that in the normal print mode. a recording head for recording on a medium;
a carriage mounted with the recording head and scanned;
a conveying mechanism including a pair of discharge rollers arranged downstream of the recording head and discharging the medium from a position facing the recording head;
a control unit that controls the recording head, the carriage, and the transport mechanism, and performs superimposition control that partially simultaneously performs a period during which the transport mechanism transports the medium and a period during which the carriage scans the recording head; prepared,
During execution of the superimposition control , before the next transport by the transport mechanism , it is determined whether the next transport is transport in which the leading edge of the medium reaches the nip position of the discharge roller pair; a first control step of performing the superimposition control for the next transport if the next transport is transport before the leading edge of the medium reaches the nip position of the pair of discharge rollers ;
During execution of the superposition control , before the next transport by the transport mechanism, it is determined whether or not the next transport is the transport in which the leading edge of the medium reaches the nip position of the discharge roller pair. , if the next transport is a transport in which the leading edge of the medium reaches the nip position of the pair of discharge rollers , the superimposition control is stopped so that the transport period and the scanning period do not overlap. and a second control step for performing control.

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