JP5346637B2 - Image recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that when there is lifting or curling on a recording medium on which an image is recorded, a poor image is recorded, and also, there is fear for damaging the nozzle surface of a recording head. <P>SOLUTION: In the recording medium correcting mechanism of this image recording apparatus, the position between the recording head and the nozzle surface is specified by sucking the recording medium to a belt platen by a negative pressure. Therefore, the recording medium on which an upward projecting lifting has been generated at the middle of the medium, or the recording medium of which the end section has curled downward is easy to be sucked by the belt platen, and the correction of the lifting or the curling is performed. On the contrary, for the recording medium on which a downward projecting lifting has been generated at the middle of the medium, or the recording medium of which the end section has curled upward, a recording medium curling detecting mechanism 51 judges the situation based on a pre-determined judgement level, and the front and rear sides are inverted by a front/rear inverting mechanism 9, and the correction is performed by sucking the recording medium to the belt platen. Thus, the image of a high quality is recorded. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an image recording apparatus for determining a deformation level of a recording medium and performing image recording suitable for the recording medium.

  2. Description of the Related Art Conventionally, an image recording apparatus such as an ink jet printer that records an image by ejecting ink, when the recording medium such as a cut sheet for recording an image is warped (curled or lifted), the recording medium Is stopped, or the image recording is stopped and the unrecorded image is conveyed and discharged. For example, Patent Document 1 proposes a technique for detecting the lifting or curling of a recording medium, and when a defective recording medium is detected from the detection result, stopping image recording and ejecting the recording medium as it is. Has been. For example, when the recording medium is lifted so as not to contact the recording head but to reduce the image recording image quality, the recording medium floating is corrected and discharged without performing image recording.

  Further, in Patent Document 2, in order to prevent generation of a defective image due to curling or floating, when a paper gap (recording medium conveyance interval) exceeds a predetermined time, a medium is supplied prior to image formation. The recording medium is discharged without recording an image. It is also disclosed to increase the amount of electrostatic adsorption so as to be more adsorbed.

  Further, for example, Patent Document 3 proposes a technique for protecting a recording head by detecting the floating and curling of a recording medium in which floating or curling occurs due to warping. One of them is provided with a shutter that covers the head surface of the recording head to prevent a recording medium with floating or curling from coming into contact with the head nozzle surface and causing damage. The other is a technique in which the recording head is separated from the recording medium and retracted so that the recording medium in which floating or curling has occurred does not come into contact with the recording head.

JP 2002-113910 A (P2002-113910A) JP 2008-12890 A JP 2002-36525 A (P2002-36525A)

  As described above, in a conventional image recording apparatus, a recording medium that has been lifted or curled due to warping, and that has been lifted or curled to such an extent that it collides with the recording head, is immediately applied. The transport mechanism is stopped to notify an error, or a shutter cover is provided to prevent damage to the nozzle surface of the recording head.

  On the other hand, if the float or curl is such that it does not collide with the recording head, the image recording is stopped and discharged, or the image is recorded as it is. When image recording is stopped and discharged, the recording medium is discarded or consumed wastefully. Even if an image is recorded as it is, if the image recording mode is set to a high image recording quality, the result is an image with a low image recording quality, and the recording operation is performed again. Is wasted, and the recording medium and ink are wasted.

  Therefore, the present invention provides an image in which the recording medium is reversed and the recording is performed on the back side when the degree of floating or curling due to warping occurring in the recording medium does not cause a conveyance error but causes a decrease in image quality. It is an object to provide a recording medium correction mechanism for a recording apparatus.

  In order to achieve the above object, the present invention relates to a conveying unit that conveys a recording medium, and a recording medium that is disposed in an image forming area provided on a conveying path by the conveying unit and is conveyed by the conveying unit. An image recording means for ejecting ink droplets to record an image; a float detecting means disposed upstream of the image recording means in the recording medium transport direction for detecting the float of the transported recording medium; and the image recording area A discharging unit that discharges the recording medium conveyed from the recording medium toward a paper discharge unit, and a conveying unit that is different from the conveying unit, and reverses the front and back of the recording medium conveyed from the image recording area. Image recording comprising: reversing means for transporting the recording medium again toward the image recording area; and control means for controlling the operation of each means according to the detection result of the recording medium floating detection means The float detection means is set to a first height from a paper support surface and detects a float of the recording medium that causes a collision of the recording medium with an inkjet head; and A second detection criterion set to a second height lower than the first height, and the control unit does not detect the first detection criterion but detects the recording medium according to the second detection criterion. Provided is an image recording apparatus that stops image recording on a recording medium and conveys the recording medium to a reversing unit when floating is detected.

  According to the present invention, when the degree of floating or curling due to warping occurring in a recording medium does not cause a conveyance error but causes a decrease in image quality, the recording medium is reversed and the recording is performed on the back side. A recording medium correction mechanism of an image recording apparatus can be provided.

FIG. 1 is a schematic diagram schematically showing a configuration of an image recording apparatus equipped with a recording medium correction mechanism in the first embodiment. FIG. 2 is a schematic perspective view of the platen unit provided in the transport mechanism and the vicinity of the lifting mechanism. FIG. 3 is a block diagram showing the configuration of the control system of the image recording apparatus. FIG. 4 is a diagram illustrating a configuration example of a recording medium curl detection mechanism (sensor) that detects the floating of the recording medium. With reference to the flowchart shown in FIG. 5, the recording medium correction operation of the image recording apparatus in the first embodiment will be described. FIG. 6 is a flowchart for explaining the recording medium correction operation of the image recording apparatus according to the second embodiment. FIG. 7 is a flowchart for explaining the recording medium correction operation of the image recording apparatus according to the third embodiment. FIG. 8 is a flowchart for explaining the recording medium correction operation of the image recording apparatus according to the fourth embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, the concept of the recording medium correction mechanism mounted on the image recording apparatus according to the present invention will be described.
The recording medium correction mechanism can be broadly classified as follows: a detection unit that detects the presence / absence and degree (warping amount) of floating or curling due to warping of the recording medium, level determination from the detected warping amount, execution of image recording, The determination unit is configured to determine whether the medium is reversed, and the medium reversing mechanism is configured to reverse the recording medium. Among these components, some components are already mounted with another mechanism, so that they are also used in common with the recording medium correction mechanism.

  In the following description, the front surface of the recording medium will be described as the first surface and the back surface will be described as the second surface. Further, a warp in which the end of the recording medium is turned up is called curl, and a warp in which the center of the recording medium is raised in a convex shape is called floating. The amount of curling is called the curl level.

  This recording medium correction mechanism performs level determination based on the amount of floating or curling of the recording medium surface (first surface) and the nozzle surface of the recording head. In this level determination, the recording medium determined by the first detection criterion that does not collide with the recording head (head crash) and has no influence on the image quality is image-recorded and ejected by a normal image recording process. However, in the level determination, when it is determined that there is a possibility of colliding with the recording head, the recording medium is stopped and notified to the operator. In addition, the recording medium which is determined not to collide with the recording head and has an influence on the image quality according to the second detection criterion is conveyed to the medium reversing mechanism without performing image recording on the first surface. Then, the image is reversed and the image is again recorded on the back surface of the recording medium by the recording medium conveyance mechanism (belt platen) and discharged.

Next, the image recording apparatus according to the first embodiment will be described in detail with reference to FIGS.
FIG. 1 is a schematic diagram schematically showing the configuration of an image recording apparatus equipped with a recording medium correction mechanism in the first embodiment, and FIG. 2 is a schematic perspective view of a platen unit provided in a transport mechanism and the vicinity of a lifting mechanism. FIG. FIG. 3 is a block diagram showing the configuration of the control system of the image recording apparatus. In the following description, in the drawing, the conveyance direction of the recording medium is the X-axis direction or the sub-scanning direction, and the direction orthogonal to the conveyance direction is the Y-axis direction, the main scanning direction, or the width direction of the recording medium. A direction orthogonal to the X-axis and Y-axis directions is taken as a Z-axis direction or a vertical direction. A path along which the recording medium is transported is referred to as a transport path.

  In FIG. 1, an image recording apparatus 1 according to this embodiment includes, as main parts, a medium supply unit 2, a conveyance mechanism 3 (conveyance unit), an image recording unit 4 (image recording unit), an elevating mechanism 5, a maintenance mechanism 6, First discharge unit 7 (discharge unit), maintenance moving mechanism 8, double-side reversing mechanism 9 (reversing unit), second discharge unit 10 (discharge unit), ink supply unit (not shown), and control unit 11 (control) Means). These components are mounted on a device frame (not shown).

  In such a configuration, the medium supply unit 2 includes a recording medium tray 12 and a pickup roller 13.

  The recording medium tray 12 is a recording medium storage unit that can store a plurality of types and sizes of recording media 60. In the present embodiment, the recording medium tray 12 includes a plurality of one-size cut sheet-shaped recording media 60. Contained. The pickup roller 13 is a recording medium take-out unit that takes out a plurality of recording media 60 accommodated in the recording medium tray 12 one by one (medium supply). A device frame (not shown) is rotatably supported.

  The transport mechanism 3 is disposed in the downstream direction of the medium supply unit 2. The transport mechanism 3 includes a registration roller pair 14, a medium supply guide 15, a recording medium curl detection mechanism 51, a platen unit 16, a transport force selectable unit 17, a first transport path switching gate 18, and a discharge guide 19. ing.

  The registration roller pair 14 disposed downstream of the pickup roller 13 is in contact with the leading end portion of the recording medium 60 taken out by the pickup roller 13 and corrects skew by aligning with the conveyance direction. It is a conveyance direction adjustment part to perform.

  The registration roller pair 14 is also a recording medium conveyance unit that conveys the recording medium 60 after alignment. In the registration roller pair 14, one roller is a driven roller 14 a that is rotatably supported by a user-operable lever, and the other roller is a drive roller that is rotatably supported by the image recording unit 4. 14b. The driving roller 14b is disposed below the driven roller 14a. The registration roller pair 14 is disposed at a position within the dimension of the recording medium 60 (dimension in the conveying direction) from the pickup roller 13 in the X-axis direction in order to reliably convey the recording medium 60 taken out by the pickup roller 13. ing.

  Further, the front / back reversing mechanism 9 is disposed above the image recording apparatus 1. The front / back reversing mechanism 9 includes a first transport path switching gate 18, a second transport path switching gate 35, a reverse transport path 39, a switchback unit 40, and a re-medium supply unit 41. A first transport path switching gate 18 and a discharge guide 19 are provided on the downstream side of the pair of medium transport rollers 24 and 25.

  With this configuration, when the leading end of the recording medium 60 being conveyed contacts the registration roller pair 14, the trailing end is nipped by the pickup roller 13. Accordingly, the conveyance operation of the recording medium 60 is continued by the pickup roller 13 until the registration roller pair 14 nips at least the front end of the recording medium 60.

  The pickup roller 13 and the registration roller pair 14 are connected to a driving force transmission system (not shown), and a driving force is supplied from the driving force transmission system. The driving force transmission system is connected to a motor (not shown) and is driven according to the driving of the motor.

  In addition, an encoder for detecting the rotational speed of the motor is provided. The encoder and the motor are connected to the control unit 11. The control unit 11 controls the driving of the motor and the driving force transmission system based on the output of the encoder (such as the number of revolutions).

  Further, the pickup roller 13 and the registration roller pair 14 described above can be freely disconnected from the driving force transmission system by a clutch. Further, each clutch is connected to the control unit 11, and on / off is controlled by the control unit 11. The medium supply guide 15 is a guide member for guiding the recording medium 60 conveyed by the registration roller pair 14 to the platen unit 16 disposed downstream.

  The recording medium curl detection mechanism 51 is installed between the medium supply guide 15 and the inkjet head 42c installed on the most upstream side in the recording medium conveyance direction. The float or curl of the recording medium 60 is detected by a recording medium sensor 70 disposed at or before the recording start position upstream of the inkjet head. The determination unit of the recording medium curl detection mechanism 51 determines the presence or absence of image recording and the recording described below based on a detection signal corresponding to the degree of floating or curling detected by the recording medium sensor 70, for example, the lifting distance. The presence / absence of reverse of the medium is determined.

  The determination level in the determination unit of the recording medium curl detection mechanism 51 has at least three types of determination levels A, B, and C classified according to two detection criteria. The determination levels A, B, and C are for detecting floating and curling due to warping of the recording medium being conveyed, and are set as follows.

Determination level A. Normal image recording level: There is no possibility of a head crash, and there is no influence on the image quality.
Determination level B. Recording medium reversal level: There is no possibility of a head crash, but it affects the degradation of image quality.
Determination level C.I. Image recording stop level: There is a high possibility of a head crash.

  The recording medium curl detection mechanism 51 includes a first detection reference and a second detection reference. The first detection criterion is that the sheet of the platen unit 16 is set to a first height from the support surface, for example, 1 mm, and there is a float on the recording medium that may cause the recording medium to collide with the inkjet head. Detect whether or not. Further, the second detection criterion is set to a second height lower than the first height of the first detection criterion, for example, 0.5 mm, and whether or not high-quality recorded images can be recorded is determined. Detect.

As the recording medium curl detection mechanism 51, a mechanical type and an optical type can be realized.
Examples of the mechanical type include the following.
1. There is a light weight lever of a shape that has a leading end extending in the conveyance path of the recording medium.
This lever detects the amount of warping due to floating or curling by the amount of pushing up of the lever that is pushed up at the leading end of the recording medium.

  2. Above 1. The lever structure is the same as that of the recording medium, and is pushed down at the front end of the recording medium. The amount by which the lever is pushed down detects the amount of floating or curling of the curl. If the lever cannot be pushed down after a predetermined time, it is determined that the degree of floating or curling is large.

  The other end of the lever detects the amount of movement of the lever by blocking the photo sensor, and detects the amount of floating or curling by increasing or decreasing the amount of light of the photo sensor. A plurality of photosensors are arranged, and the above-described determination levels A, B, and C are obtained from the detection result.

  FIG. 4 shows an example of such a mechanical recording medium curl detection mechanism. Two curl detection mechanisms 52 and 53 having substantially the same specifications are arranged along the sheet conveyance direction. On the upstream side in the paper conveyance direction (left side in the figure), a curl detection mechanism 52 having a lever tip disposed at a first height position from the paper support surface to determine whether or not the determination level is C is provided. On the downstream side in the paper transport direction (right side in the figure), a lever tip is disposed at a second height (lower than the first height) from the paper support surface in order to determine whether the determination level is A or B. A curl detection mechanism 53 is provided.

  In this example, the operation of the curl detection mechanisms 52 and 53 is detected by the photosensor 54. The photo sensor 54 is arranged so that the light transmitting / receiving element 54a is opposed to each other, and the light shielding plates 52a, 53a of the curl detection mechanisms 52, 53 move between them so as to detect floating and curling of the curl. Further, instead of the photosensor 54, a piezoelectric element that receives pressure by the operation of the curl detection mechanisms 52 and 53 may be used as the sensor. The first height is appropriately adjusted at the time of product shipment or at the user based on the distance between the paper support surface and the inkjet head, that is, the platen gap. Similarly, the second height is appropriately adjusted to be lower than the first height, for example, about half of the platen gap.

  As an optical type, a reflective sensor is arranged on the front surface (first surface) or the back surface (second surface) of the recording medium, and the amount of floating or curling is detected by the amount of displacement with respect to the reference position.

  Next, the platen unit 16 includes a platen belt 20, a plurality of platen belt rollers 21, a platen frame 22, a platen suction unit 23, and a platen support frame 50, as shown in FIG.

  The platen unit 16 is a transport mechanism that transports the recording medium 60 sent from the medium supply unit 2 downstream. The platen belt 20 that is an endless belt is supported by a platen belt roller 21 so that it can rotate, forms a belt conveyor shape, and cooperates to transport the recording medium 60 downstream.

  The platen belt 20 and the platen belt roller 21 set the conveyance direction of the recording medium 60 during recording. That is, the platen belt 20 and the platen belt roller 21 are configured to convey the recording medium 60 in the X-axis direction. The platen belt roller 21 supports the platen belt 20 so that at least the opposing surface of the platen belt 20 is flat with respect to the nozzle surfaces of the plurality of inkjet heads 42 in the image recording unit 4.

  A drive motor for rotating the platen belt roller 21 is connected to at least one of the platen belt rollers 21. As the platen belt roller 21 rotates, the platen belt 20 rotates and the recording medium 60 is conveyed.

  Further, the width of the platen belt 20 is equal to or larger than the maximum width of the recording medium 60 used for image recording. Further, the platen belt 20 is provided with suction holes 20a formed of a plurality of small diameter holes uniformly throughout.

  The platen frame 22 is supported by a platen support frame 50, and the platen support frame 50 supports the platen belt roller 21 in a rotatable manner. The platen frame 22 holds a platen suction part 23. Further, the platen frame 22 has a platen frame head facing surface 22 a facing the image recording unit 4 and on the opposite side to the platen suction unit 23. The platen frame head facing surface 22 a is set to be a flat surface in a region facing the image recording unit 4. A plurality of grooves 22d extending in the X-axis direction are formed in the platen frame head facing surface 22a. A hole 22e that penetrates through the platen suction portion 23 is provided at a substantially central portion of each groove 22d.

  The platen suction part 23 is a negative pressure generating part for generating a negative pressure on the platen frame head facing surface 22a. The platen suction portion 23 is disposed below the platen frame head facing surface 22 a and is fixed by the platen frame 22. The conveyed recording medium 60 is sucked to the platen belt 20 by the platen suction portion 23 through the suction holes 20a and the holes 22e.

On the downstream side of the platen unit 16, a pair of medium transport rollers 24 and 25 and a transport guide 26 are provided. The pair of medium transport rollers 24 and 25 transports the recording medium 60 on which the image is recorded by the image recording unit 4 downstream. Next, the image recording unit 4 disposed to face the platen unit 16 will be described.
The image recording unit 4 is an ink ejection unit that ejects ink onto the recording medium 60 conveyed by the platen unit 16, and includes a plurality of inkjet heads 42, a head holding frame (not shown), and a head cooling unit. ing.

  The ink jet head 42 is a main part of an image recording unit for recording an image. The image recording unit 4 includes linear heads (42C, 42K, 42M, and 42Y) that discharge a plurality of colors of ink, for example, cyan (C), black (K), magenta (M), yellow (Y), and the like. Have. Each inkjet head 42 (42C, 42K, 42M, and 42Y) has a length equal to or greater than the maximum width of the recording medium 60 used for image recording as well as the width of the platen belt 20 by connecting one or a plurality of recording heads. It consists of

  Each inkjet head 42 is formed with a plurality of nozzles (not shown) arranged in a line along the Y-axis direction on the surface facing the recording medium 60 being conveyed. These nozzles eject ink supplied from an ink supply unit (not shown) in the direction of gravity (vertically downward). A head holding frame (not shown) suspends and holds the inkjet head 42. Thereby, the inkjet head 42 is fixed and does not move up and down.

  An area facing the platen portion 16 of the plurality of inkjet heads 42C, 42K, 42M, and 42Y is defined as an image recording area, and a desired image is recorded on a recording medium in the image recording area.

Next, the 1st discharge part 7 arrange | positioned downstream from the discharge guide 19 is demonstrated.
The first discharge unit 7 is a discharge unit that discharges the recording medium 60 on which an image is recorded by the image recording unit 4. The first discharge unit 7 includes a pair of conveyance rollers 33 that discharge (convey) the recording medium 60 on which an image has been recorded, and a first discharge tray 34 that can store the recording medium 60 on which an image has been recorded.

Next, the front / back reversing mechanism 9 disposed above the image recording apparatus 1 will be described.
The front / back reversing mechanism 9 includes a first transport path switching gate 18, a second transport path switching gate 35, a reverse transport path 39, a switchback unit 40, and a re-medium supply unit 41. A first transport path switching gate 18 and a discharge guide 19 are provided on the downstream side of the pair of medium transport rollers 24 and 25.

  The first transport path switching gate 18 selects and switches either the discharge guide 19 or the front / back reversing mechanism 9 and the first discharge unit 7 provided above the image recording apparatus 1 described later. The second transport path switching gate 35 discharges the transport destination of the recording medium 60 transported above the image recording apparatus 1 by the first transport path switching gate 18 to the reverse transport path 39 and the second discharge unit 10. The transport route is selected and switched to either of the routes 38. The reverse conveyance path 39 conveys the recording medium 60 to the switchback unit 40. The switchback unit 40 inverts the recording medium 60 so that the non-recorded surface faces the image recording unit 4.

  The re-medium supply unit 41 transports the reversed recording medium 60 to the registration roller pair 14 again. Then, the platen unit 16 conveys the recording medium 60 while facing the image recording unit 4 again, and the image recording unit 4 ejects ink to record an image. As a result, both sides of the recording medium 60 are image-recorded.

Next, the second discharge unit 10 will be described.
The second discharge unit 10 is provided above the image recording apparatus 1 and includes a path 38, a conveyance roller pair 36, and a second discharge tray 37. The recording medium 60 conveyed to the path 38 by the second conveyance path switching gate 35 is discharged to the second discharge tray 37 by the conveyance roller pair 36.
The control unit 11 is configured by a computer including a CPU, a timer, a ROM, a RAM, an input unit, and the like (not shown). The control unit 11 is connected to the medium supply unit 2, the transport mechanism 3, the discharge unit, the image recording unit 4, the front / back reversing mechanism 9, an ink supply unit (not shown), and the like, and controls driving thereof.

Next, the recording medium correction operation of the image recording apparatus 1 in the first embodiment will be described with reference to the flowchart shown in FIG.
First, in recording medium conveyance (supply), the control unit 11 issues a driving command to a driving force transmission system (not shown), turns on the clutch, rotationally drives the pickup roller 13, and starts supplying the recording medium ( Step S1).

  When supplying the recording medium, the pickup roller 13 takes out the recording medium 60 one by one from the recording medium tray 12 and supplies the medium toward the registration roller pair 14 provided downstream in the X-axis direction. When the recording medium 60 is supplied, the control unit 11 acquires type information such as the surface friction coefficient of the recording medium 60 stored in the built-in ROM.

  At this time, a difference occurs in the take-out time of the recording medium 60 of the pickup roller 13 in accordance with the friction coefficient of the surface of the recording medium 60, so that the control unit 11 drives the pickup roller 13 in accordance with the friction coefficient of the recording medium 60. Set. The recording medium 60 taken out from the recording medium tray 12 is conveyed by the pickup roller 13 and comes into contact with the registration roller pair 14. Here, when the recording medium 60 comes into contact with the registration roller pair 14, the conveyance tip of the recording medium 60 may come into contact with the registration roller pair 14 in an inclined (skewed) state.

  Therefore, after the recording medium 60 contacts the registration roller pair 14, the control unit 11 drives the pickup roller 13 for a predetermined time. As a result, the recording medium 60 forms a fixed loop and contacts the registration roller pair 14 that is not driven.

  Further, the entire tip portion of the recording medium 60 pressed by the pickup roller 13 abuts over the entire longitudinal direction of the registration roller pair 14. Thereby, the skew is corrected and the longitudinal direction of the recording medium 60 is parallel to the X-axis direction.

  Next, the control unit 11 drives the registration roller pair 14 and the recording medium 60 is conveyed in the downstream direction. The control unit 11 refers to the type information of the recording medium 60 when the registration roller pair 14 starts to be driven. When the recording medium 60 has a lower friction coefficient than that of plain paper, for example, the pickup roller 13 is also driven at the same time. As a result, the recording medium 60 is securely nipped by the registration roller pair 14 and even the recording medium 60 having a low friction coefficient is reliably conveyed. That is, the pickup roller 13 assists the conveyance of the recording medium 60 of the registration roller pair 14.

Next, the detection unit of the recording medium curl detection mechanism 51 detects the amount of floating or curling of the recording medium 60 that has passed through the registration roller pair 14 and the medium supply guide 15.
First, the determination unit of the recording medium curl detection mechanism 51 determines whether it is the determination level C, that is, the image recording stop level [curl level determination (1)], according to the detected warp amount (step S2). ). This determination is based on the above-described determination level, and determines whether or not the image recording stop level (the amount of float or curl warpage that is expected to cause a head crash).

  In this determination, if it is determined that a head crash occurs (YES), it is determined as the determination level C, that is, the image recording stop level, the transport mechanism is immediately stopped (step S8), and an error display is displayed together with a warning sound. To notify the operator (step S9).

  On the other hand, if it is determined in step S2 that the image recording stop level is not reached (NO), it is determined whether or not the recording medium inversion level is set (curl level determination (2)) (step S3).

  If it is determined in this determination that the determination level is A, that is, the normal recording level (NO), the process proceeds to step S6 of image recording to be described later. The control unit 11 conveys the recording medium 60 to the platen unit 16 as it is at the normal image recording level according to the determination result from the determination unit of the recording medium curl detection mechanism 51.

  Before the recording medium 60 is transported to the transport mechanism 3, the control unit 11 notifies a drive command to the platen suction unit 23 of the platen unit 16 and a belt roller drive motor (not shown) (not shown). The belt 20 is driven. When the recording medium 60 is conveyed from the medium supply unit 2 to the platen unit 16 of the conveying mechanism 3, the recording medium 60 is held in close contact with the platen belt 20 and conveyed at a predetermined speed along the X-axis direction. When the leading end of the recording medium 60 is conveyed to a position facing the inkjet head 42, the control unit 11 issues an image recording command to the image recording unit 4.

  Then, the ink jet heads 42C, 42K, 42M, and 42Y cause the recording medium 60 to eject ink from the nozzles 42a. Ink ejection is performed for each inkjet head 42. Since the inkjet head 42 extends over the entire width direction of the recording medium 60, an image is recorded on the recording medium 60 over the entire width of the recording medium 60 by one ink discharge (step S6).

  Thereafter, with image recording, the platen unit 16 transports the recording medium 60 in the X-axis direction. Therefore, images are sequentially recorded on the recording medium 60 in the longitudinal direction of the recording medium 60. At that time, the entire surface of the recording medium 60 is sucked by the platen suction portion 23 through the numerous suction holes 20 a provided on the platen belt 20 and the numerous holes 22 e provided on the platen frame 22. It is conveyed closely. The image-recorded recording medium 60 is transported by the pair of medium transport rollers 24 and 25 and the transport roller 33 of the first discharge unit 7 and is discharged to the first discharge tray (step S7).

  On the other hand, in the curl level determination (2), if it is not the normal recording level but the float or curl level is sufficient to reduce the recorded image quality (YES), it is determined as the determination level B, that is, the recording medium inversion level. If the recording medium reversal level is determined, the recording medium 60 is delivered to the double-side reversing mechanism 9 (step S5) without performing image recording on the surface (first surface) of the recording medium (step S4). That is, the control unit 11 drives the platen belt 20 in a state where the recording medium 60 is sucked by the platen suction unit 23 without issuing an image recording command to the image recording unit 4, and the medium transport roller pairs 24 and 25. Lead to. At this time, the control unit 11 drives the first transport path switching gate 18 and the second transport path switching gate 35 to switch the transport destination of the recording medium 60 to the reverse transport path 39.

  When the recording medium 60 is conveyed from the reverse conveying path 39 to the switchback unit 40 and pulled out again, the front and back of the recording medium 60 are reversed, and the back surface (second surface) side of the recording medium 60 faces the recording head. It becomes the surface to do.

  Further, it is transferred from the switchback unit 40 to the platen belt 20 via the re-medium supply unit 41. At this time, the control unit issues an image recording command based on the previous unrecorded image data. Thereafter, in steps S6 and S7 described above, an image is recorded on the back side of the image recording unit 4 in the image recording area and is discharged.

  As described above, according to the present embodiment, when it is determined that the amount of warping of the recording medium may cause a head crash, the transport mechanism is stopped and a transport error is caused to the operator. Notify that it has become. On the other hand, if there is no possibility of a head crash, but it is determined that the amount of warpage may cause a reduction in image quality, image recording is not performed immediately on the recording medium, but for double-sided recording. Using the front / back reversal mechanism, the front and back sides of the recording medium are reversed and image recording is performed on the back side. By controlling the recording operation and the medium conveyance in this way, if the amount of lifting or curling is not enough to be discarded, the lifting and curling due to warping can be sufficiently suppressed by reversing the front and back, and image recording It is possible to record an image without degrading the image quality.

  When the recording medium is turned upside down as described above, the conveyance mechanism of the image recording apparatus in the present embodiment creates a negative pressure by a fan provided inside the platen, and the recording medium is sucked and adsorbed to the platen. The feature which is conveying in the state is required. In other words, when the recording medium is sucked and attracted to the platen, if the end of the recording medium is curled up (curl is generated), even if the recording medium is tried to be sucked, the leading end is insufficiently sucked. , Cannot be properly adsorbed on the platen. On the other hand, in the case of floating that protrudes toward the center of the recording medium, the floating on the inner side (near the center) of the recording medium can be crushed and the recording medium can be attracted to the platen. Therefore, even if curling has occurred at the end of the recording medium due to curling, the floating shape of the recording medium is reversed by reversing the front and back of the recording medium. In this way, the recording medium can be attracted to the platen by converting so that the center of the recording medium is raised in a convex shape. As a result, the floating of the recording medium can be reduced and image recording can be performed. Further, it is possible to prevent the quality of the recorded image from being deteriorated.

Next, a second embodiment will be described.
With reference to the flowchart shown in FIG. 6, the recording medium correction operation of the image recording apparatus according to the second embodiment will be described.
In the first embodiment described above, when the curl level determination (2) determines that the recording medium inversion level is detected, the recording medium is conveyed to the inversion path, reversed by the switchback unit 40, and again the image recording unit. The image was recorded immediately. On the other hand, in the present embodiment, image level recording is not performed immediately after the determination, but the level determination of the warp amount is performed again. The configuration of the present embodiment is equivalent to the configuration of the first embodiment described above, and will be described using the same reference numerals.

  In the present embodiment, the recording medium sensor 71 is provided in the path of the switchback unit 40. First, the recording medium 60 is taken out one by one by the pickup roller 13 (step S11). At that time, the value of the flag N indicating the number of times of determination of the level of warpage is reset (N = 0) (step S12).

  Next, as in the first embodiment described above, the detection unit of the recording medium curl detection mechanism 51 detects the amount of floating or curling of the recording medium 60 that has passed through the registration roller pair 14 and the medium supply guide 15. To do. The determination unit of the recording medium curl detection mechanism 51 determines whether or not the image recording stop level is [curl level determination (1)] according to the detected amount of warpage (step S13).

  In this determination, if it is determined that the determination level is C, that is, the image recording stop level (YES), the transport mechanism is immediately stopped (step S17), an error is displayed with a warning sound, and the operator is notified (step S17). S18).

  On the other hand, if it is not the determination level C (NO) in the determination of step S13, it is determined whether or not it is the determination level B, that is, the recording medium inversion level [decision of curl level (2)] (step S16).

  In this determination, if it is determined that it is not the determination level B (NO), since it is the normal recording level, an image is recorded on the recording medium 60 (step S14), and is conveyed by the transport roller 33 of the first discharge unit 7. It is discharged to the first discharge tray (step S15).

  In step S16, no head crash occurs, but if the float or curl level is low enough to reduce the image quality (YES), it is determined as determination level B, that is, the recording medium inversion level. If it is determined that the recording medium reversal level is reached, image recording on the surface (first surface) of the recording medium is not performed (step S19), and conveyance by the platen belt 20 is continued, and the medium conveying roller pairs 24 and 25 are detected. Lead to. At this time, the control unit 11 determines whether or not the flag N = 0 (step S20). If it is determined in this determination that the flag N = 0 (YES), the control unit 11 transports the recording medium 60 to the front / back reversing path (step S21), and passes the switchback unit 40. On the other hand, if it is determined that the flag N is not 0, that is, if it has already been determined (NO), the recording medium 60 is discharged to the second discharge unit 10 (step S22).

  Next, it is detected by the recording medium sensor 71 whether or not the recording medium 60 has passed through the switchback unit 40 (step S24). Receiving this detection result, the controller 11 rewrites the flag N = 1 (step S25) and returns to step S13 again. That is, the reversed recording medium 60 is conveyed again to the upstream side of the image recording unit 4, but before that, the curl level determination in steps S13 and S16 is performed again.

  In this re-determination, if the image recording stop level has been reached by reversing the front and back (step S13: YES), the conveyance is stopped (same here as in the process after the first curl level determination). If the image recording stop level is not lifted or curled, the second curl level determination (step S16) is performed to determine whether the recording medium 60 has a lift (normal recording level). It is determined whether the recording image quality is affected (recording medium inversion level).

  As described above, when the degree of floating or curl due to warping of the recording medium is determined and it is determined that the recording medium is inversion level, that is, when the recording medium is turned over, it is determined that image recording is possible. Accordingly, the image is not recorded and passed in front of the recording head, the switching gates 18 and 35 are switched, and are conveyed to the switchback unit 40. After the recording medium is turned over, it is conveyed upstream of the recording head. . At this time, a flag indicating the number of curl level determinations is set to 1. This is because if the normal recording level is not obtained after the second face-to-face determination, the recording medium has already been turned over once, so that the switching gates 18 and 35 are controlled without performing the second turnover. Then, it is discharged to the second discharge unit 10. This is because the normal recording level cannot be obtained by the curl level determination even if the front and back are reversed twice.

  According to the present embodiment, since the curl level determination is always performed on the recording medium 60 conveyed to the image recording unit 4, it is not possible to record an image whose image quality deteriorates more reliably. In addition, when it is determined that the recording medium has a float or curl that affects the deterioration of the quality of the recorded image on both the front and back sides, the recording medium performs the first discharge after the image recording has been properly completed. By discharging the recording medium to another second discharge unit 10 instead of the unit 7, it is possible to distinguish the image recording completion recording medium and the incomplete recording medium (recording inappropriate paper) without mixing them. Therefore, subsequent handling of the recording medium becomes easy.

Next, a third embodiment will be described.
With reference to the flowchart shown in FIG. 7, the recording medium correction operation of the image recording apparatus according to the third embodiment will be described. The present embodiment is a recording medium correction that involves setting an image quality mode (high image quality or low image quality) of an image recorded before image recording. In the following description, the setting of the image quality mode is described as an example, but the same applies to other modes such as the light / dark mode and the photo mode. In the operation of the present embodiment, operations or processes equivalent to those of the first and second embodiments described above will be briefly described.
First, when performing image recording, an image quality mode (high image quality or low image quality) is set by the user (step S31). Here, one of the high image quality mode and the low image quality mode is selected from the two image quality. This image quality mode is selected by operating the image quality mode selection SW 52 on the operation panel of the image recording apparatus. Based on the selected image quality, the control unit 11 sets M = O for the high image quality mode and M = 1 for the low image quality mode.

  Thereafter, a start button (not shown) is pressed to start an image recording operation. The recording medium 60 is taken out and delivered to the transport system (step S32). At this time, the value of the flag N indicating the number of times of level determination is reset (N = 0) (step S33). Next, as in the first embodiment described above, the determination unit of the recording medium curl detection mechanism 51 performs initial curl level determination for the recording medium 60. First, according to the detected amount of warpage, it is determined whether or not the determination level C is [curl level determination (1)] (step S34).

  If it is determined at this determination level C, that is, the image recording stop level (YES), it is determined that the determination level C is the image recording stop level at which a head crash is assumed to occur, and the transport mechanism is stopped (step S38). Then, an error is displayed together with a warning sound to notify the operator (step S39).

  On the other hand, if it is not the image recording stop level (NO), it is determined whether the determination level is B or not (curl level determination (2)) (step S35). In this determination, if the determination level is not B (NO), an image is recorded on the recording medium 60 (step S36), and is discharged to the first discharge tray 34 by the transport roller 33 of the first discharge unit 7 (step S36). S37).

  If it is determined at step S35 that the determination level is B (YES), it is determined that the recording medium inversion level has a float or curl to the extent that the image quality is lowered. If it is this recording medium inversion level, it is determined whether the image quality mode is the high image quality mode, that is, whether M = 0 (step S40). In this mode determination, if M = 0 (high image quality mode), the image is not recorded on the recording medium (step S41) and the conveyance by the platen belt 20 is continued as in the second embodiment described above. Then, it is guided to the medium conveying roller pair 24 and 25.

  At this time, the control unit 11 determines whether or not the flag N = 0 (step S42). If it is determined in this determination that the flag N = 0 (YES), the control unit 11 transports the recording medium 60 to the front / back reversing path (step S44) and passes the switchback unit 40. On the other hand, if the flag N is not 0 in the determination in step S42 (NO), that is, if the determination has already been made, the sheet is discharged to the second discharge tray 37 (step S43).

  Next, if the recording medium sensor 71 detects whether or not the recording medium 60 has passed through the switchback unit 40 (step S45), the control unit 11 rewrites the flag N = 1 (step S46) and again Return to step S34. That is, the reversed recording medium 60 is conveyed again to the upstream side of the image recording unit 4, and the curl level determination is performed again in steps S34 and S35 in the same manner as in the second embodiment described above, and the normal recording level is determined. If so, the image is recorded. On the other hand, if the recording medium reversal level is determined, the sheet is discharged to the second discharge tray 37, or if it is the image recording stop level, the conveyance is stopped and a warning is notified.

  If it is determined in step S40 that the image quality mode is not the high image quality mode (NO), that is, if the image quality mode is the low image quality mode (M = 1), the process proceeds to step S36 and image recording is recorded on the recording medium 60. Then, it is discharged to the first discharge tray 34.

  In this embodiment, when the curl level of the recording medium 60 is determined to be the recording medium reversal level, if the front and back of the recording medium 60 are not reversed, the head crash does not occur, but the image quality of the recorded image is affected. Therefore, it is assumed that the recording is not necessarily high quality. Therefore, when the image quality mode is determined and the low image quality mode is selected, the user recognizes that the image quality of the recorded image may be low. Perform image recording.

  According to this embodiment, according to the selected image mode (high-quality image or low-quality image), for example, when the high-quality image mode is set, if the recording medium inversion level that requires front-back inversion, After reversing the front and back and performing curl level determination again, image recording is performed. However, when the low-quality image mode is set, the image is recorded as it is (without reversing the front and back) even if the recording medium reversal level requires reversing the front and back.

  Therefore, whether or not image recording can be executed is determined according to the setting of the image quality of the recorded image, and if low image quality is selected, an improvement in throughput can be expected compared to the second embodiment.

Next, a fourth embodiment will be described.
With reference to the flowchart shown in FIG. 8, the recording medium correction operation of the image recording apparatus according to the fourth embodiment will be described. In this embodiment, a recording medium to be used is selected as a recording medium capable of recording a double-sided image or a recording medium only for single-sided image recording. Note that a recording medium only for single-sided image recording is described as being incapable of recording because desired image quality cannot be obtained even if image recording is performed on the back side (non-recording side).

  In the following description, the same operations or processing steps as those in the flowchart shown in FIG. 7 are simply described using the same reference numerals.

  First, before recording, either a recording medium capable of double-sided image recording or a recording medium only for single-sided image recording is selected as a recording medium used by the user (step S51). Although this selection is not shown in FIG. 1, two or more recording medium supply trays 12 are provided, and recording media for single-sided image recording of the recording medium and double-sided image recording are possible on each tray. A recording medium is loaded. The selection of the recording medium is determined by operating the recording medium selection SW 53 on the operation panel of the apparatus. Based on the selected recording medium, the control unit 11 sets a flag L = 0 for double-sided image recording and a flag L = 1 for single-sided image recording.

  Thereafter, a start button (not shown) is pressed to start an image recording operation. The recording medium 60 is taken out one by one from the selected tray by the pickup roller 13, and is delivered to the transport system as in the first embodiment described above (step S32). At this time, the value of the flag N indicating the number of warpage level determinations is reset (N = 0) (step S33).

  Next, the recording medium curl detection mechanism 51 detects the amount of floating or curling of the selected recording medium 60, and first [curl level determination (1)] as to whether or not the determination level is C is performed ( Step S34). In this determination, if the determination level is C, that is, the image recording stop level (YES), and if it is determined that the image recording stop level is assumed to cause a head crash, the transport mechanism is stopped (step S38). An error is displayed together with a warning sound, and the operator is notified (step S39).

  On the other hand, if it is not the determination level C in the determination in step S34, it is determined whether the determination level is B or not (curl level determination (2)) (step S35). In this determination, if it is determined that the determination level is not B (NO), an image is recorded on the recording medium 60 (step S36), and the first discharge tray 34 is moved to the first discharge tray 34 by the transport roller 33 of the first discharge unit 7. It is discharged (step S37).

  If it is determined at step S35 that the determination level is B (YES), it is the recording medium reversal level, and the recording medium 60 is conveyed by the platen belt 20 without recording an image. At that time, the type of the recording medium 60 is determined (step S52). That is, it is determined whether or not L = 0, and if L = 0 (for double-sided image recording), as in the second embodiment, the controller 11 has already transferred the recording medium 60 to the switchback unit. It is determined whether or not it passes (whether N = 0) (step S42). If it is not passed (N = 0) in this determination (YES), the switching gates 18 and 35 are switched to transport the recording medium 60 to the front / back reversing path (step S44) and pass through the switchback unit 40. On the other hand, if it has already passed (N = 1) in the determination of step S42 (NO), curling is not eliminated even if the front and back are reversed again, so the recording medium 60 is loaded onto the second discharge portion tray 37. Discharge (step S43). In step S52, if the selected recording medium 60 is a recording medium for single-sided image recording (L = 1) (NO), the image cannot be recorded even if the front and back are reversed. The recording medium 60 is discharged to the discharge unit tray 37 (step S43).

  Next, it is detected by the recording medium sensor 71 whether or not the recording medium 60 has passed through the switchback unit 40 (step S45). Receiving this detection result, the control unit 11 rewrites the flag N = 1 (step S46) and returns to step S34 again. That is, the reversed recording medium 60 is conveyed again to the upstream side of the image recording unit 4, and the curl level determination is performed again in steps S34 and S35.

  As described above, in the present embodiment, even when the recording medium inversion level is determined depending on the type of recording medium to be used (double-sided image recording is not possible), image recording is performed on the back side (non-recording layer surface). For a recording medium that cannot be recorded or does not obtain the desired image quality even after recording, the recording medium is discharged to a discharge tray.

  Accordingly, image recording is not performed on the back surface (non-recording layer surface) of the recording medium for single-sided image recording. This has the effect that useless operation is eliminated and it is not necessary to record an image with low image quality.

  As described above, the recording medium correction mechanism of the image recording apparatus according to the present invention causes the recording medium to be adsorbed to the belt platen by negative pressure. The recording medium curled downward is easy to be adsorbed by the belt platen and has a large correction force for floating and curling. On the other hand, a recording medium in which a downward convex float is generated at the center of the medium or a recording medium with an end curled upward is not easily adsorbed by the belt platen.

  Accordingly, by reversing the front and back of a recording medium in which a downward convex float is generated at the center of the medium or a recording medium having an end curled upward, the float or curl is easily attracted to the belt platen. Further, the floating and curl amounts of the recording medium are detected. (1) Determination level A: normal image recording level [no risk of head crash and no influence on image quality] (2) Determination level B: recording medium inversion level [ [3] Determination level C: Image recording stop level [determination criterion for the possibility of head crash].

  Judgment level B is when the recording medium float or curl that deteriorates the image recording image quality is generated, by reversing the recording medium and making the recording medium float or curl easy to correct, and recording the image again. High-quality images can be recorded without causing waste of the recording medium.

In addition, in each embodiment mentioned above, the following invention is also included.
(1) A recording medium supply unit that supplies a recording medium, a conveyance mechanism that sucks and conveys the supplied recording medium, an image recording unit that records an image on the conveyed recording medium, and an image recorded An image recording apparatus comprising: a discharge unit that discharges and stores a recording medium; and a front and back reversing mechanism that reverses the front and back of the conveyed recording medium,
A curl detection unit for detecting a curl level of the recording medium at an image recording start position;
A recording medium curl configured by whether or not image recording is performed and a level determination unit that determines whether the recording medium is reversed based on a predetermined determination level with respect to the curl level detected by the curl detection unit. Equipped with a detection mechanism,
The level determination unit is configured to detect the curl level.
A first determination that does not affect the image quality without occurrence of a head crash that is a normal image recording level;
A second determination that the image quality is affected without the occurrence of a head crash at a recording medium reversal level;
Performing either one of the third determination to stop the conveyance with the occurrence of a head crash that is an image recording stop level,
In the second determination, the recording medium correction mechanism of the image recording apparatus is characterized in that the front and back reversing mechanism reverses the front and back of the recording medium and causes the image recording unit to record again. [Evidence: Judgment of reversal of front and back, Fig. 1]
(2) The level determination unit of the recording medium curl detection mechanism includes:
When the first determination is the second determination, the front and back reversing mechanism is used to reverse the front and back of the recording medium, and the curl level on the back side of the recording medium is detected again. 2. The recording medium correction mechanism of an image recording apparatus according to claim 1, wherein when the detected curl level determination result is the second determination, the curled level is discharged to the discharge unit without recording an image. . [Rationale: Judgment based on the set image quality]
(3) The level determination unit of the recording medium curl detection mechanism includes:
Based on the image quality selected from a plurality of image quality modes before image recording, and when the first determination is the second determination, according to the image quality,
The recording medium correction mechanism of the image recording apparatus according to claim 1, wherein the image recording is performed by reversing the front and back of the recording medium by the front / back reversing mechanism, or the image is recorded on the recording medium non-reversing. [Rationale: Curl determination on the back side, FIG. 6]
(4) The level determination unit of the recording medium curl detection mechanism includes:
The supplied recording medium is a first recording medium capable of double-sided recording and a second recording medium capable of only single-sided recording.
When the second recording medium is set as the recording medium supplied before image recording and is determined as the second determination, the recording medium is discharged to the discharge unit without image recording. A recording medium correction mechanism for an image recording apparatus according to item (1). [Evidence: Determination by double-sided / single-sided recording media]
(5) In the discharge unit of the image recording apparatus,
By the level determination unit of the recording medium correction mechanism,
A first tray from which the recording medium on which an image is recorded by the first determination is discharged;
A second tray from which the unrecorded recording medium is discharged by the second determination;
A recording medium correction mechanism for an image recording apparatus according to item (1), comprising: [Evidence: Separate storage of recording media, FIG. 6, FIG. 7 and FIG. 8]

  DESCRIPTION OF SYMBOLS 1 ... Image recording apparatus, 2 ... Medium supply part, 3 ... Conveyance mechanism, 4 ... Image recording part, 5 ... Elevating mechanism, 6 ... Maintenance mechanism, 7 ... 1st discharge | emission part, 8 ... Maintenance moving mechanism, 9 ... Front and back Inversion mechanism, 10 ... second discharge unit, 11 ... control unit, 12 ... recording medium tray, 13 ... pickup roller, 14 ... registration roller pair, 14a ... driven roller, 14a ... driven roller, 15 ... medium supply guide, DESCRIPTION OF SYMBOLS 16 ... Platen part, 17 ... Conveyance force selection part, 18 ... 1st conveyance path switching gate, 19 ... Discharge guide, 20 ... Platen belt, 21 ... Platen belt roller, 22 ... Platen frame, 22a ... Platen frame head facing Surface, 22d ... groove, 23 ... platen suction part, 40 ... switchback part, 41 ..., 42 ... inkjet head, 50 ... platen support frame, 1 ... recording medium curl detection mechanism, 60 ... recording medium.

Claims (10)

Conveying means for conveying the recording medium;
An image recording unit that is disposed in an image forming area provided on a conveyance path by the conveyance unit, and that records an image by discharging ink droplets onto a recording medium conveyed by the conveyance unit;
A float detecting means disposed upstream of the image recording means in the recording medium transport direction and detecting the float of the transported recording medium;
A discharge means for discharging the recording medium conveyed from the image recording area toward a discharge section;
A reversing unit that is different from the conveying unit, reverses the front and back of the recording medium conveyed from the image recording area, and conveys the recording medium toward the image recording area again;
Control means for controlling the operation of each means according to the detection result of the recording medium floating detection means;
An image recording apparatus comprising:
The floating detection means is set to a first height from the paper support surface, and includes a first detection reference for detecting the floating of the recording medium that causes the recording medium to collide with the inkjet head, and the first height. And a second detection criterion set at a lower second height,
The controller is
An image that is not detected by the first detection standard, but when the floating of the recording medium is detected by the second detection standard, image recording on the recording medium is stopped and the recording medium is conveyed to a reversing unit. Recording device. Front and back inversion detection means for detecting whether or not the recording medium has been inverted by the inversion means,
The control unit discharges the recording medium by the discharging unit when the number of times the recording medium is reversed by the reversing unit reaches a predetermined number based on the detection result of the front / back reversing detecting unit. The image recording apparatus according to claim 1, wherein the image recording apparatus discharges toward the portion. The paper discharge unit includes a first paper discharge unit and a second paper discharge unit,
The control unit discharges a recording medium on which an image is recorded toward a first paper discharge unit, and discharges a recording medium on which no image is recorded toward a second paper discharge unit. 2. The image recording apparatus according to 2. Conveying means for conveying the recording medium;
An inkjet head that is disposed in an image forming area provided on a conveyance path by a conveyance unit and that records an image by discharging ink droplets onto a recording medium conveyed by the conveyance unit;
A float detecting means disposed upstream of the inkjet head in the recording medium transport direction and detecting the lift of the transported recording medium;
A discharge means for discharging the recording medium conveyed from the image recording area toward a discharge section;
A reversing unit that is different from the conveying unit, reverses the front and back of the recording medium conveyed from the image recording area, and conveys the recording medium toward the image recording area again;
An image recording mode setting unit that allows the user to appropriately set the recording mode of an image to be recorded on the recording medium;
Control means for controlling the operation of each means according to the detection result of the recording medium floating detection means and the setting content of the image recording mode setting section;
An image recording apparatus comprising:
The floating detection means is set to a first height from the paper support surface, and includes a first detection reference for detecting a floating of the recording medium that may cause a collision of the recording medium with an inkjet head, and the first detection reference. A second detection reference set at a second height lower than the height of
The controller is
The floating detection means does not detect with the first detection standard, detects the floating of the recording medium with the second detection standard, and the image recording mode setting unit sets the image quality of the image to be higher. An image recording apparatus characterized by stopping image recording on the recording medium and transporting the recording medium to a reversing unit. The control unit detects the floating of the recording medium based on the second detection criterion, and the image quality of the image recorded by the image recording mode setting unit is not detected by the floating detection unit based on the first detection criterion. If set to a low quality, the image recording apparatus according to claim 1, characterized in that the image recording on the recording medium. The paper discharge unit includes a first paper discharge unit and a second paper discharge unit,
The control unit discharges the recording medium on which the image is recorded toward the first paper discharge unit by the paper discharge unit, and directs the recording medium on which the image is not recorded to the second paper discharge unit by the paper discharge unit. 6. The image recording apparatus according to claim 5 , wherein the image recording apparatus discharges the image. Conveying means for conveying the recording medium;
An inkjet head that is disposed in an image forming area provided on a conveyance path by a conveyance unit and that records an image by discharging ink droplets onto a recording medium conveyed by the conveyance unit;
A float detecting means disposed upstream of the inkjet head in the recording medium transport direction and detecting the lift of the transported recording medium;
A discharge means for discharging the recording medium conveyed from the image recording area toward a discharge section;
Reversing means that is different from the conveying means, reverses the front and back of the recording medium conveyed from the image recording area, and conveys the recording medium again toward the image recording area;
A recording medium setting unit that allows the user to appropriately set the type of recording medium;
Control means for controlling the operation of each means according to the detection result of the recording medium floating detection means and the setting content of the recording medium setting unit;
An image recording apparatus comprising:
The floating detection means is set to a first height from the paper support surface, and includes a first detection reference for detecting a floating of the recording medium that may cause a collision of the recording medium with an inkjet head, and the first detection reference. A second detection reference set at a second height lower than the height of
The controller is
It is set that the floating detection means does not detect the first detection criterion, detects the floating of the recording medium based on the second detection criterion, and the recording medium setting unit can record both sides of the recording medium. An image recording apparatus characterized by stopping image recording on the recording medium and transporting the recording medium to a reversing unit. The controller is
The floating detection means does not detect the first detection criterion, detects the floating of the recording medium based on the second detection criterion, and the recording medium setting unit sets that the recording medium is not capable of duplex recording. 6. The image recording apparatus according to claim 5, wherein the image recording on the recording medium is stopped when the recording medium is stopped, and the recording medium is discharged toward the paper discharge unit by the paper discharge unit. The paper discharge unit includes a first paper discharge unit and a second paper discharge unit,
The control unit discharges the recording medium on which the image is recorded toward the first paper discharge unit, and discharges the recording medium on which the image is not recorded toward the second paper discharge unit by the paper discharge unit. The image recording apparatus according to claim 6, wherein: Conveying means for conveying the recording medium;
An inkjet head that is disposed in an image forming area provided on a conveyance path by a conveyance unit and that records an image by discharging ink droplets onto a recording medium conveyed by the conveyance unit;
A float detecting means disposed upstream of the inkjet head in the recording medium transport direction and detecting the lift of the transported recording medium;
A discharge means for discharging the recording medium conveyed from the image recording area toward a discharge section;
A reversing unit that is different from the conveying unit, reverses the front and back of the recording medium conveyed from the image recording area, and conveys the recording medium toward the image recording area again;
Control means for controlling the operation of each means according to the detection result of the recording medium floating detection means;
An image recording apparatus comprising:
The float detection means includes
A first detection standard for detecting the floating of the recording medium that may cause a collision of the recording medium with the ink jet head;
A second detection criterion for detecting the floating of the recording medium that may cause the landing position of the ink droplets ejected from the inkjet head to deviate from a predetermined position, although there is no risk of causing the recording medium to collide with the inkjet head. Have
The controller is
An image that is not detected by the first detection standard, but when the floating of the recording medium is detected by the second detection standard, image recording on the recording medium is stopped and the recording medium is conveyed to a reversing unit. Recording device.

Images