JP2016185838A - Recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording device capable of preventing or suppressing ink dripping from a paper edge during handling of a paper jam.SOLUTION: The recording device includes recording means for performing recording on a medium, conveyance means for conveying the medium, plural medium detection means provided along a medium conveyance path to detect the medium, and control means for obtaining detection information from the medium detection means. The control means executes a first step for determining a medium jam on the basis of the detection information from the medium detection means, a second step for determining whether a last liquid discharge position on the medium is located nearer to upstream or nearer to downstream in the medium on the basis of size information of the medium, the detection information from the medium detection means, and liquid discharge information for the medium, and a third step for guiding medium removal from an upstream side with respect to the recording medium if the last liquid discharge position is located nearer to the upstream, or guiding the medium removal from a downstream side with respect to the recording medium if the last liquid discharge position is located nearer to the downstream.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a recording apparatus including a recording head for recording on a medium.

  In a printer as an example of a recording apparatus, a sheet detection unit that detects the passage of a recording sheet is provided at an appropriate position on a conveyance path for conveying a recording sheet as an example of a medium. The control unit of the printer is configured to perform desired conveyance control based on the detection information of the paper detection unit.

Here, for example, when the recording paper does not pass through the paper detection means even after a predetermined time has elapsed, it is determined that the paper jam has occurred, the paper transporting operation or the recording operation is stopped, and an alert is issued to the user. There is a case. When the paper jam is determined, the user opens the cover of the apparatus and removes the recording paper jammed in the conveyance path.
At this time, there is one that improves the operability of the user by specifying the position where the paper jam occurs in the paper transport path and displaying the position to the user (Patent Document 1).

JP 2014-061955 A

  By the way, in an ink jet printer that discharges ink onto a recording sheet, among the printers, problems related to drying of the discharged ink are likely to occur. Specifically, when paper jam processing is performed, if the ink that has landed on the recording paper is undried, when the recording paper is pulled out, the ink flows to the edge of the recording paper and eventually falls and soils the floor and the like. There is.

  In particular, in the so-called line head type in which the inkjet recording head has a length that covers the entire paper width and performs recording without moving in the paper width direction, the paper transport speed is extremely high and the unit Since the amount of ink ejected in time is large, the amount of ink ejected from the determination of paper jam to the stop of the recording operation is also large. Therefore, in such an ink jet printer, the above-mentioned problem becomes more remarkable.

  Accordingly, the present invention has been made in view of such a situation, and an object of the present invention is to provide a recording apparatus capable of preventing or suppressing dripping of ink from a paper edge during paper jam processing. is there.

  In order to solve the above problems, a recording apparatus according to the first aspect of the present invention includes a recording unit that performs recording by discharging a liquid onto a medium, a conveyance unit that conveys the medium, and a medium conveyance that conveys the medium. A plurality of medium detection means for detecting the passage of the medium, and a control means for obtaining detection information of the medium detection means, the control means having the detection information of the medium detection means; The final step of determining the jam of the medium, and the final liquid ejection position of the jammed medium based on the information of the medium size information, the detection information of the medium detection means, and the liquid ejection information to the medium. A second step for determining whether the liquid is positioned upstream or downstream in the medium, and when the final liquid discharge position is positioned upstream based on the determination result of the second step Upstream from recording means Or a third step of guiding the medium removal from the downstream side to the recording means when the final liquid discharge position is located downstream. .

  According to this aspect, when the clogging of the medium occurs, the user removes the medium from the upstream side with respect to the recording unit when the final liquid ejection position is located upstream in the medium. Alternatively, when the final liquid discharge position is located on the downstream side of the medium, the user removes the medium from the downstream side with respect to the recording unit. That is, when removing the medium, the medium is removed so that the liquid drips to the side where the distance from the final liquid discharge position to the end (front end or rear end) of the medium is long. It is possible to prevent or suppress the dripping of the liquid.

  According to a second aspect of the present invention, there is provided a recording unit that performs recording by discharging a liquid onto a medium, a conveying unit that conveys the medium, and a plurality of media passing along a medium conveying path that conveys the medium. A medium detection means for detecting the medium detection means, and a control means for obtaining detection information of the medium detection means, wherein the control means determines a jam of the medium based on the detection information of the medium detection means; A second step of determining whether the jammed medium is located upstream or downstream of the recording means based on the medium size information and the detection information of the medium detection means; and Based on the determination result of the step, if the jammed medium is located upstream from the recording means, the recording means is guided to remove the medium from the downstream side, or the jammed medium is directed to the recording means. Located downstream If and executes a third step for guiding the medium is removed from the upstream side relative to the recording means.

  According to this aspect, when a jam occurs in the medium, the user removes the medium from the downstream side with respect to the recording unit when the jammed medium is positioned upstream of the recording unit. Alternatively, when the jammed medium is located downstream of the recording unit, the medium is removed from the upstream side of the recording unit. That is, when removing the medium, the medium is removed so that the liquid drips on the side where the distance from the recording means to the end (front end or rear end) of the medium is long. It is possible to prevent or suppress dripping.

According to a third aspect of the present invention, in the first or second aspect, the control means sets a waiting time between the second step and the third step.
According to this aspect, since the control means sets a waiting time between the second step and the third step, the drying of the liquid is promoted, and the dripping of the liquid from the end portion of the medium is further increased. It is possible to reliably prevent or suppress.

According to a fourth aspect of the present invention, in the third aspect, the control unit adjusts the waiting time according to the final liquid ejection position on the medium.
According to this aspect, since the waiting time is adjusted according to the distance from the final liquid discharge position in the medium, in other words, from the final liquid discharge position to the medium end (the longer side), the medium It becomes possible to more reliably prevent or suppress the dripping of the liquid from the end portion.

According to a fifth aspect of the present invention, in the second aspect, the control means sets a waiting time between the second step and the third step.
According to this aspect, since the control means sets a waiting time between the second step and the third step, the drying of the liquid is promoted, and the dripping of the liquid from the end portion of the medium is further increased. It is possible to reliably prevent or suppress.

According to a sixth aspect of the present invention, in the fifth aspect, the control unit adjusts the waiting time according to a position of the medium with respect to the recording unit.
According to this aspect, the waiting time is adjusted in accordance with the position of the medium with respect to the recording means, in other words, the distance from the recording means to the end of the medium (the longer side), so the liquid from the end of the medium It is possible to more reliably prevent or suppress the sagging.

  According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the transport unit includes a first roller and a second roller that can contact and separate from the first roller. The control means separates the second roller from the first roller when determining that the medium is jammed at least in the first step.

  According to this aspect, when the control unit determines that the medium is jammed at least in the first step, the second roller is separated from the first roller, so that the medium removability can be improved.

  According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the recording means is provided so as to be able to advance and retreat with respect to the medium conveyance path, and the control means is at least in the first step. When it is determined that the medium is jammed, the recording unit is separated from the medium conveyance path.

  According to this aspect, the control means moves the recording means away from the medium conveyance path when determining that the medium is jammed at least in the first step. It is possible to avoid rubbing the liquid discharge port of the recording means and to protect the liquid discharge port.

1 is an external perspective view of a printer according to the present invention. FIG. 3 is a side sectional view showing a paper conveyance path of the printer according to the invention. 1 is a block diagram of a printer according to the present invention. FIG. 3 is a perspective view illustrating a state in which the opening / closing body constituting the part of the sheet conveyance path is opened with respect to the apparatus main body in the printer according to the invention. 1 is an external perspective view of a printer according to the present invention. FIG. 3 is a perspective view illustrating a state in which a unit body that constitutes a part of a sheet conveyance path is pulled out from the apparatus main body. FIG. 3 is a schematic diagram showing a state of ink dripping on paper P. 6 is a graph showing the relationship between the amount of ink dripping and the ink ejection time. The graph which shows the relationship between ink dripping amount and waiting time. Explanatory drawing which shows the 1st relationship between the paper and line head in the paper detection which concerns on this invention. Explanatory drawing which shows the 2nd relationship between the paper and line head in the paper detection which concerns on this invention. Explanatory drawing which shows the 3rd relationship between the paper and line head in the paper detection which concerns on this invention. FIG. 5 is a schematic diagram of guidance display for performing jam processing from the upstream side in the transport direction in the apparatus main body. FIG. 5 is a schematic diagram of guidance display for performing jam processing from the downstream side in the transport direction in the apparatus main body. FIG. 3 is a schematic diagram of a sheet conveyance path showing an arrangement state of a plurality of sheet detection sensors according to the first embodiment. FIG. 3 is a schematic diagram showing a paper jam detection pattern in the arrangement state of paper detection sensors in the first embodiment. FIG. 5 is a flowchart of paper jam detection in the first embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, about the same structure in each Example, the same code | symbol is attached | subjected and it demonstrates only in the first Example, The description of the structure is abbreviate | omitted in a subsequent Example.

  1 is an external perspective view of a printer according to the present invention, FIG. 2 is a side sectional view showing a paper conveyance path of the printer according to the present invention, and FIG. 3 is a block diagram of the printer according to the present invention. 4 is a perspective view of the printer according to the present invention in a state in which it is opened with respect to the main body of the opening / closing body that constitutes a part of the paper transport path, and FIG. 5 is an external perspective view of the printer according to the present invention. 6 is a perspective view showing a state in which a unit body constituting a part of the sheet conveyance path is pulled out from the apparatus main body.

  7 is a schematic diagram showing the state of ink dripping on the paper P, FIG. 8 is a graph showing the relationship between the ink dripping amount and the ink ejection time, and FIG. 9 is the relationship between the ink dripping amount and the waiting time. It is a graph which shows. FIG. 10 is an explanatory view showing a first relationship between the paper and the line head in the paper detection according to the present invention, and FIG. 11 shows a second relationship between the paper and the line head in the paper detection according to the present invention. FIG. 12 is an explanatory diagram showing a third relationship between the paper and the line head in the paper detection according to the present invention, and FIG. 13 is a diagram for performing jam processing from the upstream side in the transport direction in the apparatus main body. FIG. 14 is a schematic diagram of guidance display for performing jam processing from the downstream side in the transport direction in the apparatus main body.

  FIG. 15 is a schematic diagram of a paper transport path showing the arrangement state of a plurality of paper detection sensors according to the first embodiment, and FIG. 16 is a paper jam detection in the arrangement state of the paper detection sensors in the first embodiment. FIG. 17 is a schematic diagram showing a pattern, and FIG. 17 is a flowchart of paper jam detection in the first embodiment.

  In the XYZ coordinate system shown in each figure, the X direction (device width direction) is the full paper width direction, the Y direction is the paper transport direction, and the Z direction is the distance (gap) between the recording head and the paper. The direction of the change, that is, the height direction of the apparatus is shown. In each figure, the −X direction is the front side of the apparatus, and the + X direction side is the back side of the apparatus.

<<< Printer overview >>>
An ink jet printer 10 (hereinafter referred to as a printer 10) as an example of a liquid ejection apparatus will be described with reference to FIG. The printer 10 is configured as a multifunction machine including an apparatus main body 12 and a scanner unit 14. The apparatus main body 12 includes a plurality of paper storage cassettes 16 for storing paper P (see FIG. 2) as “medium”. Each sheet storage cassette 16 is detachably attached from the front side (the −X axis direction side in FIG. 1) of the apparatus main body 12. In this specification, the paper P refers to paper such as plain paper, cardboard, and photographic paper as an example.

  Further, in the apparatus height direction (Z-axis direction) in the apparatus main body 12, a sheet receiving tray 20 that receives the sheet P on which recording is performed by a line head 18 described later is provided between the scanner unit 14 and the sheet storage cassette 16. Is provided. An operation unit 21 is provided on the front side of the apparatus main body 12. The operation unit 21 includes a display panel 23. In this embodiment, the display panel 23 is a display means such as a liquid crystal panel or a touch panel. Further, by operating the operation unit 21, it is possible to input a recording operation and an image reading operation instruction to the printer 10.

<<< About the paper transport path >>>
Next, a sheet conveyance path as a “medium conveyance path” of the sheet P as the “medium” in the printer 10 will be described with reference to FIG. In FIG. 2, reference numerals are given only to the main components of the conveyance path of the paper P, and the reference numerals are omitted for other components, particularly a plurality of spurs.

  The printer 10 in this embodiment includes a paper transport path 22. The sheet conveyance path 22 includes a straight path 24, a switchback path 26, a reverse path 28, a face-down discharge path 30, and a feeding path 32 connected to the straight path 24 from the sheet storage cassette 16.

  In the feeding path 32, a feeding roller 34, a separation roller pair 36, and a conveyance roller pair 38 are provided in order along the conveyance direction of the paper P. The feed roller 34 is driven to rotate by a drive motor (not shown). The separation roller pair 36 separates the paper P by nipping the paper P. The transport roller pair 38 is configured as a drive roller in which one roller is rotated by a drive motor (not shown), and the other roller is configured as a driven roller.

  In the following description, it is assumed that one roller in each pair of transport rollers appearing in this specification is configured as a drive roller that is driven to rotate by a drive motor (not shown), and the other roller is configured as a driven roller. explain.

  The paper P stored in the paper storage cassette 16 is fed to the downstream side of the feeding path 32 by the feeding roller 34. The sheet P fed by the feeding roller 34 is sequentially nipped by the separation roller pair 36 and the conveying roller pair 38 and fed toward the downstream side of the feeding path 32. Further, a conveyance roller pair 40 as a “conveyance unit” is provided on the downstream side in the conveyance direction of the conveyance roller pair 38. In this embodiment, the transport roller pair 40 includes a driving roller 40a as a “first roller” and a driven roller 40b as a “second roller”. Although the driven roller 40b will be described later, the driven roller 40b is configured to be able to contact and separate from the driving roller 40a (see FIG. 15).

  In the present embodiment, the feeding path 32 and the straight path 24 are connected at the position of the transport roller pair 40. That is, the feeding path 32 is set as a path from the sheet storage cassette 16 to the pair of transport rollers 40.

  The straight path 24 is configured as a path extending linearly. In the straight path 24, a pair of transport rollers 40 in order along the transport direction, a first paper detection sensor 42 that detects the passage of the paper P, a paper pressing roller 43, a belt transport means 44 as a “support member”, and a “recording head” The line head 18, the second paper detection sensor 46, and the first flap 48 are provided. In this embodiment, the straight path 24 is set as a path from the transport roller pair 40 to the first flap 48. That is, the straight path 24 is set as a path that passes through the line head 18 and extends upstream and downstream of the line head 18.

  In this embodiment, the line head 18 has a plurality of “liquid discharge nozzles” provided on the recording surface of the paper P when the paper P is conveyed to an area facing the head surface of the line head 18. Recording is performed by ejecting ink as “liquid” from the nozzles. The line head 18 in this embodiment is a recording head provided so that nozzles that eject ink cover the entire area in the sheet width direction as an example, and recording is performed on the entire sheet width without moving in the sheet width direction. It is configured as a possible recording head.

  A belt conveying unit 44 is disposed in a region facing the head surface of the line head 18. The belt conveying means 44 includes a drive shaft 44a and a driven shaft 44b, and a belt is wound around the drive shaft 44a and the driven shaft 44b. The belt conveying means 44 is driven by the rotation of the drive shaft 44a, and conveys the paper P downstream in the conveying direction. The drive shaft 44a is in contact with the paper pressing roller 43 via a belt. In this embodiment, the paper pressing roller 43 is configured to be able to contact and separate from the belt (see FIG. 15). Further, the paper pressing roller 43 suppresses the conveyed paper P from floating from the belt conveying means 44. The belt conveying unit 44 supports the side opposite to the recording surface of the paper P.

  As a result, the recording surface of the paper P supported by the belt conveying means 44 faces the head surface, and recording is performed on the recording surface of the paper P by ejecting ink from the nozzles on the head surface of the line head 18. . In addition, the belt conveying unit 44 supports the paper P from below, thereby defining a distance (gap) between the recording surface of the paper P and the head surface of the line head 18.

  A first paper detection sensor 42 is disposed on the upstream side of the line head 18 in the transport direction, and a second paper detection sensor 46 is disposed on the downstream side of the line head 18 in the transport direction.

  A first flap 48 is positioned downstream of the second paper detection sensor 46 in the transport direction. The first flap 48 is configured to be swingable by a drive mechanism controlled by a control unit 62 (see FIG. 3) described later. The first flap 48 has a posture (state shown in FIG. 2) connecting the straight path 24 and the switchback path 26 and a posture (state 48 'in FIG. 15) connecting the straight path 24 and the face-down discharge path 30. ) And can be switched. In the present embodiment, the drive mechanism for driving the first flap 48 is constituted by a solenoid. Further, the posture switching operation of the first flap 48 is controlled by a control unit 62 (see FIG. 3) as “control means”.

  When the first flap 48 is in a posture for connecting the straight path 24 and the face-down discharge path 30 (state of reference numeral 48 ′ in FIG. 15), the sheet P is conveyed from the straight path 24 to the face-down discharge path 30 by the belt conveying means 44. Sent to.

  The face-down discharge path 30 is curved and inverted while extending upward from the straight path 24 in the apparatus height direction. A plurality of transport roller pairs 50 are provided in the face-down discharge path 30 at appropriate intervals in the transport direction. In the present embodiment, the first transport roller pair 50 provided downstream from the first flap 48 in the transport direction of the paper P is in a direction in which the driven roller 50b contacts and separates from the drive roller 50a. It is configured to be movable (see FIG. 15).

  The face-down discharge path 30 is routed from the first flap 48 to the discharge port 52 positioned on the downstream side in the transport direction of the transport roller pair 50 positioned on the most downstream side in the transport direction. That is, the face-down discharge path 30 is a conveyance path that is connected to the straight path 24, and is a path that discharges the paper P that has passed through the line head 18 after being bent and inverted.

  The sheet P on which recording is performed on the recording surface by the line head 18 is sequentially nipped and conveyed by the pair of conveyance rollers 50 provided in order along the conveyance direction from the first flap 48 in the face-down discharge path 30. Then, the paper P is discharged from the discharge port 52 toward the paper receiving tray 20.

  Here, when the sheet P is conveyed along the face-down discharge path 30, the sheet P is finally conveyed with the recording surface recorded by the line head 18 facing upward, and then the recording surface is transferred to the curved portion of the face-down discharge path 30. The sheet is bent inward and conveyed, and discharged from the discharge port 52 toward the sheet receiving tray 20 with the recording surface facing downward.

<<< Conveying path of paper in double-sided recording >>>
When the first flap 48 is in a posture for connecting the straight path 24 and the switchback path 26 (see FIG. 2), the paper P is sent from the straight path 24 to the switchback path 26 by the belt conveying means 44.

  The switchback path 26 and the reverse path 28 are paths through which the sheet P passes when recording on the second side after recording on the first side of the sheet P, that is, when executing double-sided recording. Similarly, when recording is performed on the second side although recording is not performed on the first side, the paper P passes through the switchback path 26 and the reverse path 28. That is, in this specification, double-sided recording means that paper P is reversed and recording is performed on the second side regardless of whether recording is performed on the first side.

  The switchback path 26 is located inside the face-down discharge path 30 that is curved and inverted upward in the apparatus height direction, and extends along the face-down discharge path 30. The switchback path 26 includes a transport roller pair 54.

  In this embodiment, the switchback path 26 is set as a path from the second flap 56 provided above the first flap 48 to the opening 58 provided at the tip of the switchback path 26. When the switchback path 26 is connected to the straight path 24 by the first flap 48 (see FIG. 2), the sheet P is switched back from the area facing the line head 18 by the belt conveying means 44 via the first flap 48. It is sent to the path 26. The paper P is sent to a position where the rear end in the transport direction is nipped by the transport roller pair 54 in the switchback path 26.

  Here, the second flap 56 will be described. The second flap 56 is provided above the first flap 48 in the apparatus height direction (Z-axis direction). The second flap 56 is swung by an interlocking mechanism (not shown) in conjunction with the operation of the first flap 48. That is, the second flap 56 is controlled by the control unit 62 via the first flap 48 and the interlocking mechanism.

  The second flap 56 is configured to block the connection between the switchback path 26 and the reversing path 28 in a state where the first flap 48 connects the straight path 24 and the switchback path 26 (see FIG. 2). On the other hand, in a state where the first flap 48 connects the straight path 24 and the face-down discharge path 30, the second flap 56 takes a posture of connecting the switchback path 26 and the reverse path 28.

  When the second flap 56 takes the posture of connecting the switchback path 26 and the reversing path 28, the control unit 62 rotates the conveyance roller pair 54 in the direction opposite to the direction in which the paper P is sent to the switchback path 26. The paper P is sent out to the reversing path 28 with the rear end side of the paper P as the front end side. That is, the paper P is switched back.

  The inversion path 28 is set as a path from the second flap 56 to the upper part of the line head 18 and to the conveying roller pair 40 of the straight path 24. In the reversing path 28, a plurality of transport roller pairs 60 are provided at appropriate intervals in the transport direction.

  The exit side of the reversing path 28 is configured to join the straight path 24 at a position upstream of the conveying roller pair 40 in the straight path 24. Then, the paper P is fed again into the straight path 24. In other words, the reverse path 28 is a transport path connected to the switchback path 26, and reverses the sheet P transported in the reverse direction, that is, the switched back sheet P by bypassing the upper side of the line head 18, and the straight path 24. Is set as a path to be joined by the transport roller pair 40 located at the upstream side position of the line head 18.

Then, when the paper P is transported through the reversing path 28, the first surface and the second surface are reversed, transported to an area facing the line head 18 in the straight path 24, and recording is performed on the second surface. Is done. Thereafter, the paper P is discharged to the paper receiving tray 20 through the face-down discharge path 30.
<<< About the control unit >>>
The apparatus main body 12 includes a control unit 62 (see FIG. 3) as an electric circuit composed of a plurality of electronic components. The control unit 62 includes paper in the scanner unit 14, the line head 18, the first paper detection sensor 42, the belt conveyance unit 44, the second paper detection sensor 46, the first flap 48, the second flap 56, and a motor driver 64 described later. Operations necessary for execution of recording and image reading of the printer 10 such as feeding, conveying, discharging, recording operation, and document reading operation of P are controlled.

  The control unit 62 is electrically connected to the operation unit 21 and controls the printer 10 based on an operation input from the user operation unit 21. The control unit 62 is configured to be able to display a guidance display or the like in the printer 10 on the display panel 23 provided in the operation unit 21. Further, the control unit 62 may control operations necessary for executing recording and image reading of the printer 10 such as a document reading operation in accordance with an instruction from the outside (PC or the like). Further, the control unit 62 controls ink ejection from the nozzles on the head surface of the line head 18.

  A plurality of motor drivers 64 controlled by the control unit 62 are arranged in the apparatus main body 12 and respectively control a plurality of drive motors (not shown). That is, the control unit 62 controls the driving of the feeding roller 34, the separation roller pair 36, and the transport roller pairs 38, 40, 50, 54, and 60 via the motor driver 64 and the plurality of driving motors in this embodiment. doing.

<<< Configuration for Jam Processing in Paper Transport Path >>>
2 and 15, an alternate long and short dash line portion denoted by reference numeral 66 represents an opening / closing unit that can be opened and closed with respect to the apparatus main body. The open / close unit 66 can be in a closed state with respect to the apparatus main body 12 shown in FIG. 1 and in an open state with respect to the apparatus main body 12 shown in FIG. The opening / closing unit 66 has a rotation fulcrum (not shown) at the end on the + X axis direction side. The opening / closing unit 66 is configured to be rotatable with respect to the apparatus main body 12 around the rotation fulcrum (see FIGS. 1 and 4).

  In FIG. 15, the area surrounded by the alternate long and short dash line denoted by reference numeral 66 indicates the area of the open / close unit 66 in the straight path 24, and the area surrounded by the alternate long and two short dashes line denoted by reference numeral 68 represents the straight path 24. The region of the unit body 68 in FIG.

  As shown in FIG. 4, when the opening / closing unit 66 is opened with respect to the apparatus main body 12, a part of the feeding path 32 and a part of the reversing path 28 are exposed. Further, in this embodiment, when the opening / closing unit 66 is opened with respect to the apparatus main body 12, the driven roller 40b is separated from the state in which the driven roller 40b is in contact with the driving roller 40a (see FIG. 2) ( (See reference numeral 40b 'in FIG. 15). That is, the nip state in the conveyance roller pair 40 is eliminated. Further, when the opening / closing unit 66 is changed from the open state to the apparatus main body 12, the driven roller 40b is switched from a state separated from the drive roller 40a to a state in contact with the drive roller 40a.

  Further, the paper pressing roller 43 is also separated from the belt conveying means 44 when the opening / closing unit 66 is opened with respect to the apparatus main body 12, and the nip state between the paper pressing roller 43 and the belt conveying means 44 is eliminated ( (See reference numeral 43 'in FIG. 15).

  Furthermore, in this embodiment, when the opening / closing unit 66 is opened with respect to the apparatus main body 12 (see FIG. 4), the line head 18 starts from the state in which the distance from the belt of the belt conveying means 44 is defined. Retreat upward in the vertical direction (see reference numeral 18 'in FIG. 15).

  Therefore, when removing the paper P from the upstream side of the line head 18, by opening the opening / closing unit 66 with respect to the apparatus main body 12, a part of the feeding path 32 and a part of the reversing path 28 are exposed and the driven roller 40b. Since the paper pressing roller 43 and the line head 18 are retracted to the retracted positions (see reference numerals 40b ', 43' and 18 'in FIG. 15), access to the paper jammed paper P becomes easy and the paper P is removed. Can be improved.

  2 and 15 again, the two-dot chain line portion denoted by reference numeral 68 in FIGS. 2 and 15 is in a first state (see FIG. 5) and a second state (see FIG. 6) in which the sheet conveyance path 22 is opened.

In the straight path 24, the unit body 68 reverses the curve from the downstream side of the belt conveying means 44 to the first flap 48 and the second flap 56, and in the switchback path 26 from the second flap 56 via the conveying roller pair 54. Includes the route to the middle of the part. Furthermore, the unit body 68 passes through the pair of transport rollers 50, 50, 50, 50 from the first flap 48 in the face-down discharge path 30 and is fifth from the pair of transport rollers 50 provided from the first flap 48. A route up to the middle of the route toward the provided transport roller pair 50 is included.

  As shown in FIGS. 5 and 6, the unit body 68 is configured to be movable along the paper transport direction (Y-axis direction in FIGS. 5 and 6) with respect to the apparatus main body 12. In this embodiment, a pair of rail members 70 provided in the apparatus main body 12 are configured to be able to be taken in and out of the apparatus main body 12.

  In this embodiment, when the unit body 68 is in the second state, the driven roller 50b in the first transport roller pair 50 provided downstream from the first flap 48 in the transport direction of the paper P is the driving roller 50a. Is retracted from the position in contact with the drive roller 50a, and the nip state between the drive roller 50a and the driven roller 50b is eliminated (see reference numeral 50b 'in FIG. 15). When the unit body 68 is in the second state, the line head 18 retreats upward in the apparatus height direction from the state where the distance of the belt conveying means 44 from the belt is defined (see reference numeral 18 'in FIG. 15). ).

  As shown in FIG. 6, when the unit body 68 is pulled out from the apparatus main body 12 (second state), a part of the straight path 24, a part of the switchback path 26, and the face-down discharge path 30. Is exposed toward the outside of the apparatus main body 12. In particular, in the present embodiment, the division positions of the unit body 68 and the apparatus main body 12 are set in the middle of the curved portion of the switchback path 26 and the curved portion of the face-down discharge path 30. Thus, when the paper P is jammed in the curved portion of the switchback path 26 and the curved portion of the face-down discharge path 30, the unit body 68 is brought into the second state (see FIG. 6), thereby switching back. It is possible to easily perform a paper jam handling operation in the curved portion of the path 26 and the curved portion of the face-down discharge path 30.

<<< Basic concept of paper detection and jam handling >>>
Subsequently, the basic concept of the jam processing of the paper P in the present invention will be described below. First, a problem during jam processing will be described.
When a paper jam occurs when the line head 18 and the paper P face each other, if print data remains, ink is continuously ejected from the line head 18 while the paper P is stopped. That is, a large amount of ink may be ejected at the same position on the paper P. When such a paper P is pulled out, the ink flows on the recording surface and eventually reaches the front end of the paper and drips down. There is a risk of fouling.

FIG. 7 shows an example of such a situation of ink dripping, and the symbol Ps indicates the leading end of the paper (the downstream end in the transport direction). In FIG. 7, black portions represent ink that has been ejected onto the paper P and has flowed. In FIG. 7, the vertical direction is the vertical direction, and the ink flows downward in the vertical direction.
When a paper jam occurs, as an example, the open / close unit 66 is opened with respect to the apparatus main body 12, and the paper P that has caused a paper jam from the paper transport path 22 is viewed from the right side of the apparatus (from the -Y axis direction in FIG. 2). When the ink is removed, the ink that is discharged onto the surface of the paper P and cannot be absorbed by the paper P flows toward the front end side of the paper P. Here, the ink dripping amount Y (mm) indicates the distance that the ink has flowed from the portion ejected concentrated at one place to the front end Ps side of the paper P, that is, the dripping amount.

  In particular, in this embodiment, the line head 18 is of a type that extends in the paper width direction, has ink discharge nozzles arranged in the paper width direction, and discharges ink without moving in the paper width direction. For this reason, the amount of ink discharged per unit time is larger, and the above-mentioned ink dripping can occur more remarkably.

  FIG. 8 shows the relationship between the ink ejection time T (ms) and the ink dripping amount Y (mm) at a predetermined duty value. The relationship between the ink ejection time T (ms) and the ink dripping amount Y (mm) is represented by the equation Y = R × T. That is, the ink dripping amount Y (mm) and the ink ejection time T (ms) are in a proportional relationship.

  In the above equation, R represents an ink dripping coefficient. The ink dripping coefficient R changes according to the paper type of the paper P and the type of ink. The ink dripping amount Y (mm) becomes the longest when ink is ejected at the maximum printing duty value on the paper having the smallest ink absorption amount per unit time.

  FIG. 9 shows the relationship between the amount of ink dripping (mm) on the paper P and the waiting time WT. When time elapses while a large amount of ink is ejected on the paper P, a part of the ejected ink is shown. As the ink dries, the ink dripping amount Y (mm) decreases. The ink dripping amount Y (mm) tends to decrease as the waiting time WT (ms) becomes longer. The use of this waiting time WT (ms) will be described separately.

  As described above, the distance from the discharge position (concentrated discharge position) to the leading edge or the trailing edge of the paper when a paper jam occurs and ink is intensively discharged at one place is the ink dripping amount (mm). If it is shorter, the ink drips from the leading edge or the trailing edge of the paper.

  Here, whether the ink intensively ejected at one place flows to the leading edge or the trailing edge of the paper is whether to remove the jammed paper from the right side (upstream side) of the apparatus or from the left side (downstream side) of the apparatus. Dependent. That is, if the jammed paper is pulled out from the right side (upstream side) of the apparatus, the ink flows toward the front end (downstream side) of the paper, and conversely, if the paper is pulled out from the left side of the apparatus (downstream side), the ink is It flows toward the upstream side.

Therefore, for example, when the distance from the concentrated discharge position to the rear end (upstream end) of the sheet is longer than the distance from the concentrated discharge position to the front end (downstream end) of the sheet, the longer distance (in this case) If the ink is allowed to flow on the rear edge side of the paper, the possibility of avoiding dripping of the ink increases.
Specifically, in this case, the control unit 62 guides the user to the jam processing so that the user pulls out the sheet from the left side (downstream side) of the apparatus.

  More specific description will be given below. In FIG. 10, reference numeral 18A denotes the position of the line head when the paper leading edge Ps passes through the first paper detecting sensor, and reference numeral 18B denotes the second paper detecting sensor downstream from the first paper detecting sensor. This is the position of the line head when passing. In FIG. 10, for convenience of explanation, the line head 18 is shown as moving relative to the paper.

  If the second paper detection sensor does not detect the passage of the paper front end Ps even after a predetermined time has elapsed after the first paper detection sensor detects the passage of the paper front end Ps, it can be determined that a paper jam has occurred, and the jam has occurred. It can be determined that the position of the line head 18 with respect to the paper P in the state is one of the areas A. In other words, it can be determined that the final ink ejection position when a paper jam occurs is any location within the area A.

In the case of FIG. 10, if the paper P is pulled out to the downstream side (upper side in FIG. 10), the ink ejected in a concentrated manner flows toward the paper rear end Pe side. You can earn and suppress dripping of ink.
FIG. 11 shows the reverse case. In FIG. 11, reference numeral 18A denotes the position of the line head when the paper leading edge Ps passes through the third paper detection sensor on the downstream side of the second paper detection sensor. , 18B is the position of the line head when the paper leading edge Ps passes through the fourth paper detection sensor downstream from the third paper detection sensor.

  If the fourth paper detection sensor does not detect the passage of the paper leading end Ps even after a predetermined time has elapsed after the third paper detection sensor detects the passage of the paper leading edge Ps, it can be determined that a paper jam has occurred, and the jam has occurred. It can be determined that the position of the line head 18 with respect to the paper P in the state is one of the areas A. In other words, it can be determined that the final ink ejection position when a paper jam occurs is in any one of the areas A.

  In the case of FIG. 11, if the paper P is pulled upstream (downward in FIG. 10), the ink ejected in a concentrated manner flows toward the paper front end Ps side. You can earn and suppress dripping of ink.

That is, when the control unit 62 can determine that the jammed paper P is positioned upstream of the line head 18 (FIG. 10), the control unit 62 guides the user to remove the paper from the downstream side of the line head 18 or is jammed. When the paper P is positioned downstream of the line head 18 (FIG. 11), the user is guided to remove the paper from the upstream side with respect to the line head 18.
In other words, the control unit 62 guides the user to remove the sheet from the upstream side with respect to the line head 18 when the final ink discharge position when the paper jam occurs is located upstream (FIG. 11). Alternatively, if the final ink discharge position when the paper jam occurs is located downstream (FIG. 10), the user is guided to the line head 18 to remove the paper from the downstream side.

In order to determine whether the jammed paper is upstream or downstream with respect to the line head 18, as is apparent from the above description, at least the detection information of each paper detection sensor and The paper size information obtained from the driver information is required.
In order for the control unit 62 to determine whether the final ink ejection position when a paper jam occurs is upstream or downstream, as is apparent from the above description, at least each paper detection sensor Detection information, paper size information obtained from the driver information, and ink ejection information to the paper are required.
The above is the basic idea of the present invention.

Although it is a rare case, depending on the paper size and the position of the paper detection sensor, as shown in FIG. 12, the area A (the expected head position range when a paper jam occurs) may cross the paper center position. In such a case, the probability of the head position is determined. For example, in the example of FIG. 12, the region A is biased to the upstream side with respect to the center position, and there is a high probability that the head position when the paper jam occurs is upstream. Therefore, the user may be guided to remove the sheet from the upstream side with respect to the line head 18.
Alternatively, in the region A, when the paper conveyance proceeds, the amount of ink intensively ejected at one location also decreases. In other words, when the paper conveyance does not proceed, the amount of ink intensively ejected at one location is Therefore, in the example of FIG. 12, the user may be guided to the user to remove the sheet from the downstream side with respect to the line head 18.

  However, in view of the ink discharge information, in the example of FIG. 12, in the area A, there is a case where ink discharge is not performed on the upstream side of the center position of the paper and ink discharge is performed on the downstream side. In such a case, it is preferable to guide the user to remove the sheet from the downstream side with respect to the line head 18.

The control unit 62 outputs a guide message for pulling out the jammed paper P from either the opening / closing unit 66 side (upstream side in the transport direction) or the unit body 68 side (downstream side in the transport direction) of the apparatus main body 12. When the printer 10 is connected to an external device such as a display panel 23 or a PC, the image is displayed on the display unit of the external device via a driver of the external device.
FIG. 13 and FIG. 14 are examples of such display.

<<< Example >>>
Next, based on the above basic idea, a more specific example will be described with reference to FIGS. The sheet detection sensors 72 as a plurality of “medium detection units” arranged in the sheet conveyance path 22 include, as an example, a first sheet detection sensor 42, a second sheet detection sensor 46, and a third sheet detection sensor 47. In FIG. 15, the paper conveyance path 22 is not shown except for a part for the sake of explanation, and a part of the paper conveyance path 22 is drawn linearly for the sake of simplicity. Further, a sensor (not shown) is further provided at an appropriate position upstream from the first paper detection sensor 42, and a sensor (not shown) is further provided at an appropriate position downstream from the third paper detection sensor 47. However, description will be made based on the sensor shown in FIG.

  Referring to FIG. 15, the paper P is transported at the transport speed V to the downstream side in the transport direction. The straight path 24 is provided with a transport roller pair 40. The transport roller pair 40 nips the paper P in a state where the driving roller 40a and the driven roller 40b are in contact with each other, and transports the paper P downstream in the transport direction. When the opening / closing unit 66 is opened with respect to the apparatus main body 12, the driven roller 40b is separated from the driving roller 40a, and the nip state between the driving roller 40a and the driven roller 40b is eliminated.

  In addition, a first paper detection sensor 42 is disposed on the downstream side of the transport roller pair 40 in the transport direction. The line head 18 is provided on the downstream side of the first paper detection sensor 42. A belt conveying unit 44 is provided in a region facing the nozzle surface of the line head 18. In this embodiment, the belt conveying means 44 is in contact with the paper pressing roller 43. The belt conveying unit 44 conveys the paper P from the upstream side in the conveying direction to the downstream side by rotationally driving a belt wound around a rotation shaft provided on the upstream side and the downstream side in the conveying direction. In this embodiment, the belt conveying unit 44 functions as a support member that supports a surface of the paper P opposite to the surface facing the line head 18 in the region facing the nozzle surface of the line head 18.

  In this embodiment, the paper pressing roller 43 is switched between the state in which it is in contact with the belt conveying means 44 (see reference numeral 43 in FIG. 15) and the state in which it is retracted from the belt conveying means 44 (see reference numeral 43 'in FIG. 15). It is configured to be possible. When the opening / closing unit 66 is opened with respect to the apparatus main body 12, the paper pressing roller 43 is separated from the belt conveying unit 44, and the nip state between the paper pressing roller 43 and the belt conveying unit 44 is eliminated.

  Further, the line head 18 is configured to be able to adjust a gap, that is, a gap, with the belt conveying unit 44 in the apparatus height direction. Specifically, the line head 18 is configured to be displaceable in a direction (up and down direction in FIG. 15) that is in contact with and away from the belt conveying unit 44. Incidentally, a two-dot chain line portion denoted by reference numeral 18 ′ in FIG. 15 indicates the line head 18 in a state where the gap with respect to the belt conveying means 44 is increased. In this embodiment, when the opening / closing unit 66 is opened with respect to the apparatus main body 12 and when the unit body 68 is in the second state with respect to the apparatus main body 12, the line head 18 is retracted upward in the apparatus height direction. To do.

  A second paper detection sensor 46 that detects the paper P is disposed downstream of the line head 18 in the transport direction. Further, when the unit body 68 is in the second state with respect to the apparatus main body 12, the pair of transport rollers 50 located on the downstream side of the third paper detection sensor 47 is driven by the driven roller 50b being separated from the drive roller 50a. The nip state between the roller 50a and the driven roller 50b is eliminated.

Processing when paper jam occurs in the above configuration will be described with reference to FIGS. In the following, the processing content using the first paper detection sensor 42 and the second paper detection sensor 46 will be described, but the processing content using the third paper detection sensor 47 is the same.
Further, in FIG. 16, the positions of the paper P4 to P8 on the paper transport path 22 are schematically shown, and the paper P4 to P8 are simultaneously transported to the paper transport path 22. It does not indicate.
In FIG. 16, the upper and lower black triangle marks on each sheet indicate the center position of the sheet in the sheet conveyance direction. Further, the sheet P is conveyed at the conveyance speed V to the downstream side in the conveyance direction.

  First, in step S1, the paper P is transported downstream in the transport direction from the paper storage cassette 16 in which the paper P is stored via the feeding path 32. The control unit 62 starts feeding the paper P from the paper storage cassette 16 and simultaneously counts the elapsed time with a timer. In step S2, it is determined whether or not the first paper detection sensor 42 has detected the leading edge Ps of the paper P before the time t1 elapses after the feeding of the paper P from the paper storage cassette 16 is started. Here, the time t1 is a time when the leading edge Ps of the paper P conveyed at the conveyance speed V originally reaches the first paper detection sensor 42 from the paper storage cassette 16.

  When the first paper detection sensor 42 cannot detect the leading edge Ps of the paper P by time t1, that is, when the paper P4 in FIG. 16 is in the state, the control unit 62 determines that the paper P4 is the first paper detection sensor 42 in step S3. It is determined that a paper jam (paper jam) has occurred on the upstream side in the paper transport direction. In this case, the paper P4 has a paper jam upstream of the region facing the line head 18 in the transport direction.

  In step S4, the control unit 62 displays a guidance display (see FIG. 13) that the sheet P4 is pulled out from the sheet conveyance path 22 from the upstream side of the first sheet detection sensor 42 in the sheet conveyance path 22. To display. When the user receives the guidance display and opens the opening / closing unit 66 with respect to the apparatus main body 12, the driven roller 40b, the paper pressing roller 43, and the line head 18 are in a retracted state, and the paper P4 is easily removed from the paper transport path 22. Can be pulled out.

  Next, when the first paper detection sensor 42 detects the leading edge Ps of the paper P by time t1 in step S2, the time t2 has elapsed since the first paper detection sensor 42 detected the leading edge Ps of the paper P in step S5. It is determined whether or not the second paper detection sensor 46 has detected the leading edge Ps of the paper P by the time. Here, the time t2 is a time when the leading edge Ps of the paper P conveyed at the conveyance speed V originally reaches the second paper detection sensor 46 from the first paper detection sensor 42.

  When the second paper detection sensor 46 cannot detect the leading edge Ps of the paper P by time t2, that is, when the paper P5 is in the state shown in FIG. It is determined that Ps has caused a paper jam (paper jam) between the first paper detection sensor 42 and the second paper detection sensor 46.

  Based on the size information of the paper P5 and the detection information of the paper detection sensor 72, the control unit 62 positions the paper P5 facing the line head 18 (final ink ejection position) on the paper P5 upstream or downstream. Determine if it is located. In this embodiment, the control unit 62 determines that the final ink ejection position on the paper P2 is closer to the downstream side in the transport direction on the paper P2.

  In step S7, the control unit 62 displays a guidance display (see FIG. 14) indicating that the sheet P5 is pulled out from the sheet conveyance path 22 from the downstream side of the second sheet detection sensor 46 in the sheet conveyance path 22. To display. In response to this guidance display, the user pulls out the unit body 68 from the apparatus main body 12 to the second state. As a result, the line head 18 and the driven roller 50b (see FIG. 15) are in the retracted state, so that the paper P5 can be pulled out downstream in the paper transport direction.

  Therefore, since the paper P5 is pulled out from the end of the paper P that is close to the position facing the line head 18 (final ink ejection position) on the paper P5, that is, from the front end Ps side, the paper is ejected from the final ink ejection position on the paper P5. The distance to the rear end of P5 becomes longer than the ink dripping amount, and it is possible to prevent or suppress the ink from dripping from the rear end of the paper P5.

  Next, when the second paper detection sensor 46 detects the leading edge Ps of the paper P by time t2 in step S5, that is, when it is in the state of the paper P6 in FIG. 16, the first paper detection sensor 42 in step S8. It is determined whether or not the trailing edge of the paper P6 has been detected by the time t3 after the leading edge Ps of the paper P6 is detected. Here, the time t3 is a time during which the paper P conveyed at the conveyance speed V originally passes through the first paper detection sensor 42.

  If the trailing edge of the paper P6 cannot be detected by the time t3 after the first paper detection sensor 42 detects the leading edge Ps of the paper P6, the control unit 62 determines that the paper P6 is the first paper detection sensor 42 and the paper P6 in step S9. It is determined that a paper jam (paper jam) has occurred over the second paper detection sensor 46.

  In this case, the control unit 62 determines the area downstream of the upstream area relative to the center position of the paper P6 in the area facing the line head 18 in the paper P6 based on the size information of the paper P6 and the detection information of the paper detection sensor 72. Is determined to be large. Then, it is determined that the final ink ejection position on the paper P6 is closer to the downstream side in the transport direction on the paper P6.

  In step S 7, the control unit 62 displays a guidance display (FIG. 14) on the display panel 23 of the operation unit 21 that the sheet P 6 is pulled out from the sheet conveyance path 22 from the downstream side of the second sheet detection sensor 46 in the sheet conveyance path 22. Display. In response to this guidance display (FIG. 14), the user pulls out the unit body 68 from the apparatus main body 12 to the second state. As a result, the line head 18 and the driven roller 50b (see FIG. 15) are in a retracted state, so that the paper P6 can be pulled out downstream in the paper transport direction.

  Since the sheet P6 is also pulled out from the leading end side of the sheet P6, the distance from the final ink ejection position to the rear end of the sheet P6 can be made longer than the amount of ink dripping, and ink dripping from the rear end of the sheet P6 can be suppressed. .

Next, in step S8, when the trailing edge of the paper P is detected after the first paper detection sensor 42 detects the leading edge Ps of the paper P until the time t3 has elapsed, that is, when the paper P7 in FIG. In step S10, it is determined whether or not the trailing edge of the sheet P7 has been detected before the time t4 elapses after the second sheet detection sensor 46 detects the leading edge Ps of the sheet P7.
Here, the time t4 is a time during which the paper P conveyed at the conveyance speed V originally passes through the second paper detection sensor 46.

  If the trailing edge of the paper P7 cannot be detected by the time t4 after the second paper detection sensor 46 detects the leading edge Ps of the paper P7, the control unit 62 detects that the leading edge Ps of the paper P7 is the second paper in step S11. It is determined that a paper jam (paper jam) has occurred in a state where the sensor 46 is located downstream in the transport direction and the rear end is located between the first paper detection sensor 42 and the second paper detection sensor 46.

  In this case, the control unit 62 determines that the final ejection position of the ink on the paper P7 is closer to the upstream in the transport direction on the paper P7 based on the size information of the paper P7 and the detection information of the paper detection sensor 72. In step S 4, the control unit 62 displays a guidance display (FIG. 13) on the display panel 23 of the operation unit 21 that the sheet P 7 is pulled out from the sheet conveyance path 22 from the upstream side of the first sheet detection sensor 42 in the sheet conveyance path 22. Display. In response to this guidance display (FIG. 13), the user opens the opening / closing unit 66 with respect to the apparatus main body 12, and with the driven roller 40b, the paper pressing roller 43, and the line head 18 retracted, the paper P7 is removed from the paper transport path 22. Can be pulled out.

  Since the paper P7 is pulled out from the rear end side of the paper P7, the distance from the final ejection position of ink near the rear end of the paper P7 to the front end Ps of the paper P7 is larger than the ink dripping amount. The length can be increased, and ink can be prevented or suppressed from dripping from the front end Ps of the paper P7.

  Next, in step S12, when the second paper detection sensor 46 detects the trailing edge of the paper P8 from the detection of the leading edge Ps of the paper P8 until the time t4 has elapsed, the control unit 62 performs the recording operation in the line head 18. The paper P8 is determined to be completed, and is transported to the paper receiving tray 20 via the face-down discharge path 30 on the downstream side in the transport direction. In the case of double-sided recording, the control unit 62 reverses the front and back surfaces of the paper P8 to the area facing the line head 18 again via the switchback path 26 and the reverse path 28 and transports the paper P8.

  In this embodiment, step S2, step S5, step S8, and step S10 are first steps for determining a paper jam (paper jam) of the paper P based on detection information of the paper detection sensor 72 in the jam processing. Steps S3, S6, S9, and S11 are the final ejection positions of ink on the paper P that has caused paper jam based on the size information of the paper P, the detection information of the paper detection sensor 72, and the ink ejection information to the paper P. Is the second step for determining whether the paper P is located on the upstream side or the downstream side in the transport direction. Steps S4 and S7 are based on the determination result of the second step and the final ink ejection position is If it is located upstream, it guides the removal of the paper P from the upstream side to the line head 18 or ink. If the final discharge position is located downstream toward is the third step to the line head 18 to guide the removal of the paper P from the downstream side.

<<< Modification of the first embodiment >>>
(1) In the present embodiment, step S4, step S9 and step S11 are executed after step S3, step S6, step S9 and step S11. However, instead of this configuration, step S3, step S6, step S9 and A configuration is possible in which the waiting time WT (ms) is set after execution of step S11, and steps S4 and S7 are executed after the waiting time WT (ms) has elapsed. With this configuration, the ink drying is promoted because the waiting time WT (ms) is set between Step S3, Step S6, Step S9 and Step S11 and Step S4 and Step S7 (FIG. 9). ), It is possible to more reliably prevent or suppress ink dripping from the end of the paper P.

(2) Note that the waiting time WT (ms) may be set according to the distance from the final ink ejection position to the end of the paper (the end on the ink flow side) as an example. More specifically, when the distance is short, the waiting time WT (ms) is set long, and when the distance is long, the waiting time WT (ms) is set short. As a result, it is possible to more reliably prevent or suppress ink dripping from the end of the paper P.

(3) In other words, the control unit 62 may adjust the waiting time according to the position of the paper P with respect to the line head 18 when a paper jam occurs. That is, when a paper jam occurs, the waiting time may be adjusted according to the distance from the position facing the line head 18 on the paper to the end on the ink flow side. More specifically, when the distance is short, the waiting time WT (ms) is set long, and when the distance is long, the waiting time WT (ms) is set short. As a result, it is possible to more reliably prevent or suppress ink dripping from the end of the paper P.

(4) Further, in this embodiment, when the control unit 62 determines that the paper P is jammed, the line head 18 is separated from the paper transport path 22, that is, is displaced so as to increase the gap with the belt transport means 44. May be. With this configuration, it is possible to avoid rubbing the ink nozzles of the line head 18 with the paper P when removing the jammed paper P, and to protect the ink nozzles.

(5) The relationship [Y = R × T] between the ink ejection time T (ms) and the ink dripping amount Y (mm) shown in FIG. 8 and the ink dripping coefficient R obtained from the relationship are under various conditions. Can be obtained.
For example, in the present embodiment, the paper with the smallest ink absorption amount per unit time is used, and the ink dripping coefficient R when ink is ejected at the maximum duty value is obtained from the test result, that is, the most safety is considered. The ink dripping coefficient R is obtained under the above-mentioned conditions. For example, an average value may be used for the duty value, and the most frequently used paper (for example, plain paper) is used for the test. Also good.
In addition, when measuring the ink dripping amount Y (mm), it is the most safe condition that the posture of the paper is a right angle (ink droops vertically downward), but based on the actual condition at the time of paper jam processing, The ink dripping amount Y (mm) may be measured with a predetermined inclination posture.
Furthermore, when measuring the ink dripping amount Y (mm), it is the most safe condition to wait until the ink is completely dried. However, based on the actual condition at the time of paper jam processing, The ink dripping amount Y (mm) after a predetermined time may be measured without waiting for drying.
(6) In this embodiment, when the line head 18 is in a state in which the opening / closing unit 66 is open with respect to the apparatus main body 12 or when the unit body 68 is in the second state with respect to the apparatus main body 12, The line head 18 is in a state in which the opening / closing unit 66 is open with respect to the apparatus main body 12 or the unit body 68 is in the second state with respect to the apparatus main body 12 instead of this configuration. In this case, the belt conveying unit 44 and the predetermined distance (gap) may be maintained.

  In summary, the printer 10 according to the present exemplary embodiment includes a line head 18 that performs recording by ejecting ink onto the paper P, a pair of transport rollers 40 that transports the paper P, and a paper transport path that transports the paper P. 22, a plurality of sheet detection sensors 72 that detect passage of the sheet P and a control unit 62 that obtains detection information of the sheet detection sensor 72 are provided. The control unit 62 determines the jam of the paper P based on the detection information of the paper detection sensor 72, the size information of the paper P, the detection information of the paper detection sensor 72, the ink discharge information to the paper P, Based on these information, the second step for determining whether the final ink ejection position of the jammed paper P is located upstream or downstream in the paper P is also obtained. In addition, when the final ink discharge position X2 is located upstream, the line head 18 is guided to remove the paper P from the upstream side, or when the final ink discharge position X2 is located downstream, the line is detected. The third step of guiding the removal of the paper P from the downstream side to the head 18 is executed.

  In the present embodiment, the control unit 62 sets a waiting time between the second step and the third step. The control unit 62 adjusts the waiting time according to the final ejection position of the ink on the paper P.

  In addition, the printer 10 according to the present embodiment includes a line head 18 that performs recording by discharging ink onto the paper P, a pair of transport rollers 40 that transport the paper P, and a paper transport path 22 that transports the paper P. A plurality of paper detection sensors 72 that detect passage of the paper P and a control unit 62 that obtains detection information of the paper detection sensor 72 are provided. The control unit 62 determines the jam of the paper P based on the detection information of the paper detection sensor 72, and the jammed paper P based on the size information of the paper P and the detection information of the paper detection sensor 72. The second step for determining whether the paper P is located upstream or downstream with respect to the line head 18 and the judgment result of the second step, the jammed paper P is located upstream with respect to the line head 18. When the sheet P is positioned, the removal of the sheet P from the downstream side is guided to the line head 18, or when the jammed sheet P is positioned downstream of the line head 18, the sheet from the upstream side with respect to the line head 18. And a third step for guiding the removal of P.

  In the present embodiment, the control unit 62 sets a waiting time between the second step and the third step. The control unit 62 adjusts the waiting time according to the position of the paper P with respect to the line head 18.

  In the printer 10, the transport roller pair 40 includes a driving roller 40 a and a driven roller 40 b that can contact and separate from the driving roller 40 a. The control unit 62 separates the driven roller 40b from the driving roller 40a when determining whether the paper P is jammed at least in the first step.

  In the printer 10, the line head 18 is provided so as to be able to advance and retreat with respect to the paper transport path 22. The control unit 62 moves the line head 18 away from the paper transport path 22 when determining that the paper P is jammed at least in the first step.

  In the above-described embodiment, the line head 18 as a recording head is a type that discharges liquid in a fixed state without moving. However, the present invention is not limited to this, and the nozzle of the recording head moves while the recording head moves in a predetermined direction. The present invention can also be applied to a type in which liquid is discharged from.

In this embodiment, the paper detection sensor 72 according to the present invention is applied to an ink jet printer as an example of a recording apparatus. However, the present invention can also be applied to other liquid ejecting apparatuses in general.
Here, the liquid ejecting apparatus uses an ink jet recording head, and is not limited to a recording apparatus such as a printer, a copier, and a facsimile machine that discharges ink from the recording head to perform recording on a recording medium. And a device for ejecting a liquid corresponding to the application from a liquid ejecting head corresponding to the ink jet recording head to an ejected medium corresponding to the recording medium, and attaching the liquid to the ejected medium.

  In addition to the recording head, as a liquid ejecting head, a color material ejecting head used for manufacturing a color filter such as a liquid crystal display, and an electrode material (conductive paste) used for forming an electrode such as an organic EL display or a surface emitting display (FED) Examples thereof include an ejection head, a bioorganic matter ejection head used for biochip production, and a sample ejection head as a precision pipette.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

10 Printer, 12 Main body, 14 Scanner unit,
16 paper cassette, 18, 18A, 18B line head, 20 paper tray,
21 Operation unit, 22 Paper transport path, 23 Display panel, 24 Straight path,
26 switchback path, 28 reverse path, 30 face-down discharge path,
32 Feeding path, 34 Feeding roller, 36 Separating roller pair,
38, 40, 50, 54, 60 Transport roller pair, 40a Drive roller,
40b driven roller, 42 first paper detection sensor, 43 paper pressing roller,
44 belt conveying means, 44a drive shaft, 44b driven shaft, 46 second paper detection sensor, 47 third paper detection sensor, 48 first flap, 50a drive roller,
50b driven roller, 52 discharge port, 56 second flap, 58 opening, 62 control unit,
64 motor drivers, 66 opening and closing units, 68 unit bodies, 70 rail members,
72 paper detection sensor, area A, P, P2, P4, P5, P6, P7, P8 paper,
Pe paper trailing edge, Ps paper leading edge, R ink dripping coefficient,
S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12 steps, T ink ejection time, WT waiting time, V transport speed, X2 final ejection position,
Y Ink dripping amount

Claims (8)

A recording means for performing recording by discharging a liquid to a medium;
Conveying means for conveying the medium;
A plurality of medium detection means for detecting the passage of the medium provided along a medium conveyance path for conveying the medium;
Control means for obtaining detection information of the medium detection means,
The control means includes a first step of determining a medium jam based on detection information of the medium detection means;
Based on the medium size information, the detection information of the medium detection means, and the liquid discharge information to the medium, the final liquid discharge position of the jammed medium is located upstream or downstream in the medium. A second step of determining whether to
Based on the determination result of the second step, when the final liquid ejection position is located upstream, the recording means is guided to remove the medium from the upstream side, or the final liquid ejection position is downstream. A third step of guiding the recording means to remove the medium from the downstream side when it is located closer to the recording means;
A recording apparatus. A recording means for performing recording by discharging a liquid to a medium;
Conveying means for conveying the medium;
A plurality of medium detection means for detecting the passage of the medium provided along a medium conveyance path for conveying the medium;
Control means for obtaining detection information of the medium detection means,
The control means includes a first step of determining a medium jam based on detection information of the medium detection means;
A second step of determining whether the jammed medium is located upstream or downstream relative to the recording means based on the medium size information and the detection information of the medium detection means;
Based on the determination result of the second step, when the jammed medium is located upstream from the recording means, the recording means is guided to remove the medium from the downstream side, or the jammed medium is recorded in the recording means. A third step of guiding medium removal from the upstream side to the recording means when located downstream from the means;
A recording apparatus. The recording apparatus according to claim 1 or 2, wherein the control unit sets a waiting time between the second step and the third step.
A recording apparatus. The recording apparatus according to claim 3, wherein the control unit adjusts the waiting time according to the final liquid ejection position on the medium.
A recording apparatus. The recording apparatus according to claim 2, wherein the control unit sets a waiting time between the second step and the third step.
A recording apparatus. 6. The recording apparatus according to claim 5, wherein the control unit adjusts the waiting time according to a position of a medium with respect to the recording unit.
A recording apparatus. The recording apparatus according to any one of claims 1 to 6, wherein the transport unit includes a first roller and a second roller that can contact and separate from the first roller.
The control means separates the second roller from the first roller when determining that the medium is jammed at least in the first step.
A recording apparatus. The recording apparatus according to any one of claims 1 to 7, wherein the recording unit is provided so as to be capable of advancing and retreating with respect to the medium conveyance path.
The control means separates the recording means from the medium conveying path when determining that the medium is jammed at least in the first step.
A recording apparatus.

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