JP7009566B2 - Inkjet recording device - Google Patents

Description

The present invention relates to an inkjet recording apparatus including a recording head that ejects ink and records an image.

In Patent Document 1, a recording medium horizontally loaded on a feed tray at the bottom of the apparatus is transported to a position facing the recording head for recording, and then further transported vertically upward to be above the feed tray. Disclosed is an inkjet recording device that ejects to an ejection tray in. The recording medium is recorded by the recording head in a horizontally supported state, and then transported vertically upward.

U.S. Patent Application Publication No. 2014/0203499

However, in the configuration of Patent Document 1, the recording medium fed from the feed tray is inked by the recording head in a state of being horizontally conveyed, and then is conveyed in the conveying direction by a roller pair arranged downstream of the recording head. Is changed vertically upward. Therefore, a strong contact pressure is generated between the recording surface immediately after the ink is applied and the roller pair in contact with the recording surface, which may deteriorate the image of the recording surface. In addition, ink may adhere to the rollers, and the ink may be re-transferred to a non-recording area of the same recording medium or a subsequent recording medium to deteriorate the image quality.

In view of the above problems, the present invention has an inkjet recording capable of improving the image quality of a recording medium in a configuration in which a horizontally held recording medium is fed, recorded by a recording head, and then conveyed vertically upward. It is to provide the device.

Therefore, the present invention has a first loading unit for loading the first recording medium and a second loading unit that is arranged below the first loading unit and can load a second recording medium larger than the first recording medium. And a recording medium having a discharge port surface provided above the first loading section and provided with a plurality of ejection ports for ejecting ink, and supplied from the first loading section or the second loading section. On the other hand , the back surface of the recording medium is supported at a predetermined angle with respect to the horizontal direction at a position facing the ejection port surface in the recording state where ink is ejected for recording and the recording head is used for recording. A platen to be printed, and a first transport path for transporting the recording medium on which recording has been performed to the upper side of the recording head at an angle larger than the predetermined angle in the horizontal direction downstream of the platen in the transport direction of the recording medium. The angle of the ejection port surface in the recording state is different from that in the standby state in which recording is not performed, and the ejection port surface is in the recording state and the standby state. In any of the above cases, the position is included above the area occupied by the second loading unit and is not included above the area occupied by the first loading unit.

According to the present invention, it is possible to improve the image quality of a recording medium in a configuration in which a horizontally held recording medium is fed, recorded by a recording head, and then conveyed vertically upward.

It is a figure when the recording apparatus is in a standby state. It is a control block diagram of a recording device. It is a figure when the recording apparatus is in a recording state. (A) to (c) are transport route diagrams of the recording medium supplied from the first cassette. (A) to (c) are transport route diagrams of the recording medium supplied from the second cassette. (A) to (d) are transport route diagrams when a recording operation is performed on the back surface of the recording medium. It is a figure when the recording apparatus is in a maintenance state. (A) and (b) are perspective views which show the structure of the maintenance unit.

FIG. 1 is an internal configuration diagram of an inkjet recording device 1 (hereinafter referred to as a recording device 1) used in the present embodiment. In the figure, the x direction indicates the horizontal direction, the y direction (the direction perpendicular to the paper surface) indicates the direction in which the discharge ports are arranged in the recording head 8 described later, and the z direction indicates the vertical direction.

The recording device 1 is a multifunction device including a printing unit 2 and a scanner unit 3, and various processes related to a recording operation and a reading operation can be executed individually or in conjunction with the printing unit 2 and the scanner unit 3. The scanner unit 3 includes an ADF (auto document feeder) and an FBS (flatbed scanner), and reads the document automatically fed by the ADF and the document placed on the FBS document table by the user (scan). )It can be performed. Although the present embodiment is a multifunction device having both a print unit 2 and a scanner unit 3, it may be a form in which the scanner unit 3 is not provided. FIG. 1 shows a state in which the recording device 1 is in a standby state in which neither recording operation nor reading operation is performed.

In the print section 2, a first cassette 5A and a second cassette 5B for accommodating the recording medium (cut sheet) S are detachably installed at the bottom of the housing 4 below in the vertical direction. The first cassette 5A contains a relatively small recording medium up to A4 size, and the second cassette 5B contains a relatively large recording medium up to A3 size in a flat stack. In the vicinity of the first cassette 5A, a first feeding unit 6A for separating and feeding the contained recording media one by one is provided. Similarly, a second feeding unit 6B is provided in the vicinity of the second cassette 5B. When the recording operation is performed, the recording medium S is selectively fed from one of the cassettes.

The transport roller 7, the discharge roller 12, the pinch roller 7a, the spur 7b, the guide 18, the inner guide 19, and the flapper 11 are transport mechanisms for guiding the recording medium S in a predetermined direction. The transfer roller 7 is a drive roller arranged on the upstream side and the downstream side of the recording head 8 and driven by a transfer motor (not shown). The pinch roller 7a is a driven roller that rotates by niping the recording medium S together with the transport roller 7. The discharge roller 12 is a drive roller arranged on the downstream side of the transport roller 7 and driven by a transport motor (not shown). The spur 7b sandwiches and conveys the recording medium S together with the transfer roller 7 and the discharge roller 12 arranged on the downstream side of the recording head 8.

The guide 18 is provided in the transport path of the recording medium S and guides the recording medium S in a predetermined direction. The inner guide 19 has a curved side surface with a member extending in the y direction, and guides the recording medium S along the side surface. The flapper 11 is a member for switching the direction in which the recording medium S is conveyed during the double-sided recording operation. The discharge tray 13 is a tray for loading and holding the recording medium S discharged by the discharge roller 12 after the recording operation is completed.

The recording head 8 of the present embodiment is a full-line type color inkjet recording head, and has a plurality of ejection ports for ejecting ink according to the recording data as much as the width of the recording medium S along the y direction in FIG. It is arranged. When the recording head 8 is in the standby position, the discharge port surface 8a of the recording head 8 faces vertically downward and is capped by the cap unit 10 as shown in FIG. When performing the recording operation, the print controller 202, which will be described later, changes the orientation of the recording head 8 so that the discharge port surface 8a faces the platen 9. The platen 9 is composed of a flat plate extending in the y direction, and supports the recording medium S on which the recording operation is performed by the recording head 8 from the back surface. The movement of the recording head 8 from the standby position to the recording position will be described in detail later.

The ink tank unit 14 stores inks of four colors supplied to the recording head 8. The ink supply unit 15 is provided in the middle of the flow path connecting the ink tank unit 14 and the recording head 8, and adjusts the pressure and the flow rate of the ink in the recording head 8 within an appropriate range. In this embodiment, a circulation type ink supply system is adopted, and the ink supply unit 15 adjusts the pressure of the ink supplied to the recording head 8 and the flow rate of the ink collected from the recording head 8 within an appropriate range.

The maintenance unit 16 includes a cap unit 10 and a wiping unit 17, and operates them at a predetermined timing to perform a maintenance operation on the recording head 8. The maintenance operation will be described in detail later.

FIG. 2 is a block diagram showing a control configuration in the recording device 1. The control configuration is mainly composed of a print engine unit 200 that controls the print unit 2, a scanner engine unit 300 that controls the scanner unit 3, and a controller unit 100 that controls the entire recording device 1. The print controller 202 controls various mechanisms of the print engine unit 200 according to the instructions of the main controller 101 of the controller unit 100. Various mechanisms of the scanner engine unit 300 are controlled by the main controller 101 of the controller unit 100. The details of the control configuration will be described below.

In the controller unit 100, the main controller 101 configured by the CPU controls the entire recording device 1 while using the RAM 106 as a work area according to the programs and various parameters stored in the ROM 107. For example, when a print job is input from the host device 400 via the host I / F 102 or the wireless I / F 103, predetermined image processing is performed on the image data received by the image processing unit 108 according to the instruction of the main controller 101. Apply. Then, the main controller 101 transmits the image data subjected to the image processing to the print engine unit 200 via the print engine I / F 105.

The recording device 1 may acquire image data from the host device 400 via wireless communication or wired communication, or may acquire image data from an external storage device (USB memory or the like) connected to the recording device 1. Is also good. The communication method used for wireless communication and wired communication is not limited. For example, as a communication method used for wireless communication, Wi-Fi (Wireless Fidelity) (registered trademark) and Bluetooth (registered trademark) can be applied. Further, as a communication method used for wired communication, USB (Universal Serial Bus) or the like can be applied. Further, for example, when a read command is input from the host device 400, the main controller 101 transmits this command to the scanner unit 3 via the scanner engine I / F 109.

The operation panel 104 is a mechanism for the user to input / output to / from the recording device 1. The user can instruct operations such as copying and scanning via the operation panel 104, set a print mode, and recognize information of the recording device 1.

In the print engine unit 200, the print controller 202 configured by the CPU controls various mechanisms included in the print unit 2 while using the RAM 204 as a work area according to a program and various parameters stored in the ROM 203. When various commands and image data are received via the controller I / F 201, the print controller 202 temporarily stores them in the RAM 204. The print controller 202 causes the image processing controller 205 to convert the stored image data into the recording data so that the recording head 8 can be used for the recording operation. When the recorded data is generated, the print controller 202 causes the recording head 8 to execute a recording operation based on the recorded data via the head I / F 206. At this time, the print controller 202 drives the feeding units 6A and 6B, the transport roller 7, the discharge roller 12, and the flapper 11 shown in FIG. 1 via the transport control unit 207 to transport the recording medium S. According to the instruction of the print controller 202, the recording operation by the recording head 8 is executed in conjunction with the conveying operation of the recording medium S, and the printing process is performed.

The head carriage control unit 208 changes the direction and position of the recording head 8 according to an operating state such as a maintenance state or a recording state of the recording device 1. The ink supply control unit 209 controls the ink supply unit 15 so that the pressure of the ink supplied to the recording head 8 falls within an appropriate range. The maintenance control unit 210 controls the operation of the cap unit 10 and the wiping unit 17 in the maintenance unit 16 when performing the maintenance operation on the recording head 8.

In the scanner engine unit 300, the main controller 101 controls the hardware resources of the scanner controller 302 while using the RAM 106 as a work area according to the programs and various parameters stored in the ROM 107. As a result, various mechanisms included in the scanner unit 3 are controlled. For example, the main controller 101 controls the hardware resources in the scanner controller 302 via the controller I / F 301, so that the document mounted on the ADF by the user is conveyed via the transfer control unit 304 and is conveyed by the sensor 305. read. Then, the scanner controller 302 stores the read image data in the RAM 303. The print controller 202 can cause the recording head 8 to execute a recording operation based on the image data read by the scanner controller 302 by converting the image data acquired as described above into recording data. ..

FIG. 3 shows when the recording device 1 is in the recording state. Compared to the standby state shown in FIG. 1, the cap unit 10 is separated from the discharge port surface 8a of the recording head 8, and the discharge port surface 8a faces the platen 9. In the present embodiment, the plane of the platen 9 is tilted by about 45 degrees with respect to the horizontal direction, and the discharge port surface 8a of the recording head 8 at the recording position is also in the horizontal direction so that the distance from the platen 9 is kept constant. It is tilted about 45 degrees with respect to.

When the recording head 8 is moved from the standby position shown in FIG. 1 to the recording position shown in FIG. 3, the print controller 202 uses the maintenance control unit 210 to lower the cap unit 10 to the retracted position shown in FIG. As a result, the discharge port surface 8a of the recording head 8 is separated from the cap member 10a. After that, the print controller 202 is rotated by 45 degrees while adjusting the height of the recording head 8 in the vertical direction by using the head carriage control unit 208, so that the discharge port surface 8a faces the platen 9. When the recording operation is completed and the recording head 8 moves from the recording position to the standby position, the print controller 202 performs the reverse process of the above.

Next, the transport path of the recording medium S in the printing unit 2 will be described. When the recording command is input, the print controller 202 first moves the recording head 8 to the recording position shown in FIG. 3 by using the maintenance control unit 210 and the head carriage control unit 208. After that, the print controller 202 uses the transport control unit 207 to drive either the first feeding unit 6A or the second feeding unit 6B according to the recording command, and feeds the recording medium S.

4 (a) to 4 (c) are diagrams showing a transport route when the A4 size recording medium S housed in the first cassette 5A is fed. The recording medium S loaded on the top of the first cassette 5A is separated from the second and subsequent recording media by the first feeding unit 6A, and is nipped into the transfer roller 7 and the pinch roller 7a while the platen 9 is inserted. It is conveyed toward the recording area P between the recording head 8 and the recording head 8. FIG. 4A shows a transport state immediately before the tip of the recording medium S reaches the recording area P. The traveling direction of the recording medium S is changed from the horizontal direction (x direction) to a direction inclined by about 45 degrees with respect to the horizontal direction while being fed to the first feeding unit 6A and reaching the recording area P. To.

In the recording area P, ink is ejected toward the recording medium S from a plurality of ejection ports provided in the recording head 8. The back surface of the recording medium S in the area to which the ink is applied is supported by the platen 9, and the distance between the ejection port surface 8a and the recording medium S is kept constant. The recording medium S after the ink is applied passes through the left side of the flapper 11 whose tip is tilted to the right while being guided by the transport roller 7 and the spur 7b, and moves upward in the vertical direction of the recording device 1 along the guide 18. Be transported. FIG. 4B shows a state in which the tip of the recording medium S passes through the recording region P and is conveyed upward in the vertical direction. The traveling direction of the recording medium S is changed vertically upward by the transport roller 7 and the spur 7b from the position of the recording region P tilted by about 45 degrees with respect to the horizontal direction.

The recording medium S is conveyed upward in the vertical direction and then discharged to the discharge tray 13 by the discharge roller 12 and the spur 7b. FIG. 4C shows a state in which the tip of the recording medium S passes through the discharge roller 12 and is discharged to the discharge tray 13. The ejected recording medium S is held on the eject tray 13 with the side on which the image is recorded by the recording head 8 facing down.

5 (a) to 5 (c) are diagrams showing a transport path when the A3 size recording medium S housed in the second cassette 5B is fed. The recording medium S loaded on the top of the second cassette 5B is separated from the second and subsequent recording media by the second feeding unit 6B, and is nipped into the transfer roller 7 and the pinch roller 7a while the platen 9 is inserted. It is conveyed toward the recording area P between the recording head 8 and the recording head 8.

FIG. 5A shows a transport state immediately before the tip of the recording medium S reaches the recording area P. A plurality of transport rollers 7, a pinch roller 7a, and an inner guide 19 are arranged in a transport path from feeding to the second feeding unit 6B to reaching the recording area P, so that the recording medium S has an S-shape. It is curved upward and transported to Platen 9.

Subsequent transfer routes are the same as in the case of the A4 size recording medium S shown in FIGS. 4 (b) and 4 (c). FIG. 5B shows a state in which the tip of the recording medium S passes through the recording region P and is conveyed upward in the vertical direction. FIG. 5C shows a state in which the tip of the recording medium S passes through the discharge roller 12 and is discharged to the discharge tray 13.

6 (a) to 6 (d) show a transport path when a recording operation (double-sided recording) is performed on the back surface (second surface) of the A4 size recording medium S. When double-sided recording is performed, the recording operation is performed on the second surface (back surface) after recording the first surface (front surface). Since the transfer process for recording the first surface is the same as in FIGS. 4A to 4C, the description thereof is omitted here. Hereinafter, the transfer process after FIG. 4C will be described.

When the recording operation on the first surface by the recording head 8 is completed and the rear end of the recording medium S passes through the flapper 11, the print controller 202 reversely rotates the transport roller 7 to record the recording medium S inside the recording device 1. Transport to. At this time, since the tip of the flapper 11 is controlled to be tilted to the left by an actuator (not shown), the tip of the recording medium S (the rear end in the recording operation of the first surface) passes through the right side of the flapper 11. It is transported downward in the vertical direction. FIG. 6A shows a state in which the front end of the recording medium S (the rear end in the recording operation of the first surface) passes through the right side of the flapper 11.

After that, the recording medium S is conveyed along the curved outer peripheral surface of the inner guide 19, and is again conveyed to the recording area P between the recording head 8 and the platen 9. At this time, the second surface of the recording medium S faces the discharge port surface 8a of the recording head 8. FIG. 6B shows a transport state immediately before the tip of the recording medium S reaches the recording area P for the recording operation on the second surface.

Subsequent transfer routes are the same as in the case of the first surface recording shown in FIGS. 4 (b) and 4 (c). FIG. 6C shows a state in which the tip of the recording medium S passes through the recording region P and is conveyed upward in the vertical direction. At this time, the flapper 11 is controlled to move to a position where the tip is tilted to the right by an actuator (not shown). FIG. 6D shows a state in which the tip of the recording medium S passes through the discharge roller 12 and is discharged to the discharge tray 13.

Next, the maintenance operation for the recording head 8 will be described. As also described with reference to FIG. 1, the maintenance unit 16 of the present embodiment includes a cap unit 10 and a wiping unit 17, and these are operated at predetermined timings to perform a maintenance operation.

FIG. 7 is a diagram when the recording device 1 is in the maintenance state. When moving the recording head 8 from the standby position shown in FIG. 1 to the maintenance position shown in FIG. 7, the print controller 202 moves the recording head 8 upward in the vertical direction and the cap unit 10 downward in the vertical direction. Then, the print controller 202 moves the wiping unit 17 from the retracted position to the right in FIG. 7. After that, the print controller 202 moves the recording head 8 downward in the vertical direction to a maintenance position where maintenance operation is possible.

On the other hand, when the recording head 8 is moved from the recording position shown in FIG. 3 to the maintenance position shown in FIG. 7, the print controller 202 moves the recording head 8 vertically upward while rotating the recording head 8 by 45 degrees. Then, the print controller 202 moves the wiping unit 17 to the right from the retracted position. After that, the print controller 202 moves the recording head 8 downward in the vertical direction to a maintenance position where the maintenance operation by the maintenance unit 16 is possible.

FIG. 8A is a perspective view showing a state in which the maintenance unit 16 is in the standby position, and FIG. 8B is a perspective view showing a state in which the maintenance unit 16 is in the maintenance position. 8 (a) corresponds to FIG. 1 and FIG. 8 (b) corresponds to FIG. 7. When the recording head 8 is in the standby position, the maintenance unit 16 is in the standby position shown in FIG. 8A, the cap unit 10 is moving upward in the vertical direction, and the wiping unit 17 is housed inside the maintenance unit 16. Has been done. The cap unit 10 has a box-shaped cap member 10a extending in the y direction, and by bringing this into close contact with the ejection port surface 8a of the recording head 8, evaporation of ink from the ejection port can be suppressed. Further, the cap unit 10 also has a function of collecting ink ejected to the cap member 10a by preliminary ejection or the like and sucking the collected ink into a suction pump (not shown).

On the other hand, in the maintenance position shown in FIG. 8B, the cap unit 10 is moving downward in the vertical direction, and the wiping unit 17 is pulled out from the maintenance unit 16. The wiper unit 17 includes two wiper units, a blade wiper unit 171 and a vacuum wiper unit 172.

In the blade wiper unit 171, a blade wiper 171a for wiping the discharge port surface 8a along the x direction is arranged in the y direction by a length corresponding to the arrangement region of the discharge port. When performing a wiping operation using the blade wiper unit 171, the wiping unit 17 moves the blade wiper unit 171 in the x direction in a state where the recording head 8 is positioned at a height that allows contact with the blade wiper 171a. By this movement, the ink and the like adhering to the ejection port surface 8a are wiped off by the blade wiper 171a.

At the entrance of the maintenance unit 16 when the blade wiper 171a is housed, a wet wiper cleaner 16a for removing ink adhering to the blade wiper 171a and applying a wet liquid to the blade wiper 171a is arranged. Each time the blade wiper 171a is housed in the maintenance unit 16, the wet wiper cleaner 16a removes the deposits and the wet liquid is applied. Then, when the discharge port surface 8a is wiped next, the wet liquid is transferred to the discharge port surface 8a to improve the slipperiness between the discharge port surface 8a and the blade wiper 171a.

On the other hand, the vacuum wiper unit 172 has a flat plate 172a having an opening extending in the y direction, a carriage 172b movable in the opening in the y direction, and a vacuum wiper 172c mounted on the carriage 172b. The vacuum wiper 172c is arranged so that the discharge port surface 8a can be wiped in the y direction as the carriage 172b moves. A suction port connected to a suction pump (not shown) is formed at the tip of the vacuum wiper 172c. Therefore, when the carriage 172b is moved in the y direction while operating the suction pump, the ink or the like adhering to the discharge port surface 8a of the recording head 8 is sucked into the suction port while being wiped by the vacuum wiper 172c. At this time, the flat plate 172a and the positioning pins 172d provided at both ends of the opening are used for aligning the discharge port surface 8a with respect to the vacuum wiper 172c.

In the present embodiment, it is possible to carry out a first wiping process in which the wiping operation by the blade wiper unit 171 is performed and the wiping operation by the vacuum wiper unit 172 is not performed, and a second wiping process in which both wiping processes are sequentially performed. .. When performing the first wiping operation, the print controller 202 first pulls out the wiping unit 17 from the maintenance unit 16 in a state where the recording head 8 is retracted vertically upward from the maintenance position in FIG. 7. Then, the print controller 202 moves the recording head 8 vertically downward to a position where it can abut on the blade wiper 171a, and then moves the wiping unit 17 into the maintenance unit 16. By this movement, the ink and the like adhering to the ejection port surface 8a are wiped off by the blade wiper 171a. That is, the blade wiper 171a wipes the discharge port surface 8a when moving from the position pulled out from the maintenance unit 16 into the maintenance unit 16.

When the blade wiper unit 171 is housed, the print controller 202 then moves the cap unit 10 vertically upward to bring the cap member 10a into close contact with the discharge port surface 8a of the recording head 8. Then, the print controller 202 drives the recording head 8 in that state to perform preliminary ejection, and sucks the ink collected in the cap member 10a by the suction pump.

On the other hand, when performing the second wiping process, the print controller 202 first slides the wiping unit 17 from the maintenance unit 16 in a state where the recording head 8 is retracted vertically upward from the maintenance position in FIG. 7. Pull out. Then, the print controller 202 moves the recording head 8 vertically downward to a position where it can abut on the blade wiper 171a, and then moves the wiping unit 17 into the maintenance unit 16. As a result, the wiping operation by the blade wiper 171a is performed on the discharge port surface 8a. Next, the print controller 202 slides the wiping unit 17 from the maintenance unit 16 and pulls it out to a predetermined position with the recording head 8 retracted vertically upward from the maintenance position shown in FIG. 7. Subsequently, the print controller 202 positions the discharge port surface 8a and the vacuum wiper unit 172 using the flat plate 172a and the positioning pin 172d while lowering the recording head 8 to the wiping position shown in FIG. 7. After that, the print controller 202 executes the wiping operation by the vacuum wiper unit 172 described above. The print controller 202 retracts the recording head 8 upward in the vertical direction, stores the wiping unit 17, and then, similarly to the first wiping process, pre-discharges the recording head 8 into the cap member and sucks the collected ink. Do the action.

According to the present embodiment described above, the recording unit (discharge port surface 8a) of the recording head 8 is occupied by the second cassette 5B in the X direction in both the standby state shown in FIG. 1 and the recording state shown in FIG. It is in a position that fits within the area. Further, the space is effectively utilized by moving the recording head 8 in the difference region between the first cassette 5A and the second cassette 5B in the X direction by moving the first cassette 5A and the second cassette 5B toward one end side in the X direction. can do. Therefore, the installation area of the recording device 1 can be suppressed to an area substantially equal to that of the loading unit (second cassette 5B) for accommodating the unrecorded recording medium. In addition to the recording head, all the mechanisms such as the platen, the transport unit, the transport path, the discharge unit, the ink tank unit, the maintenance unit, etc. are contained in the region of the loading unit (second cassette 5B) in the X direction. May be good.

Then, according to the present embodiment, the recording medium S is conveyed in a configuration in which the horizontally loaded recording medium S is fed to the recording area P and the recording medium S after recording is conveyed vertically upward. The direction is brought closer from the horizontal direction to the vertical direction before applying ink to the recording medium S. That is, the roller pair composed of the transport roller 7 and the spur 7b arranged downstream of the recording head 8 abuts on the recording surface immediately after the ink is applied, but the posture is already closer to the vertical direction than the horizontal direction. The recording medium S will be oriented in the vertical direction. Therefore, as compared with the configuration in which the transport direction of the recording medium immediately after recording is changed from the horizontal direction to the vertical direction as in Patent Document 1, the contact pressure generated between the recording surface and the roller pair can be suppressed to be small. As a result, while keeping the installation area of the recording device small, it suppresses the deterioration of the image quality of the recording surface and the retransfer of the ink adhering to the roller pair to the subsequent recording medium, thereby improving the image quality of the recording medium. Can be improved.

In the above embodiment, the transport angle of the recording medium S during recording is set to 45 degrees, but the transport angle is not limited to 45 degrees. If the angle is at least closer to the vertical direction (90 degrees) than the horizontal direction (0 degrees) in the loaded state, the contact pressure generated between the recording surface and the roller pair immediately after recording is suppressed to be smaller than before. The effect of the invention can be obtained.

However, if the transport angle during recording is made too close to the vertical direction, the drag force that the recording medium receives from the platen due to its own weight also decreases, and the flatness of the recording surface and the distance between papers become unstable, resulting in poor image quality. There is a risk of damage. Therefore, the transport angle of the recording medium in the recording unit, that is, the installation angle of the platen, is adjusted to such an extent that both the problem caused by the contact force of the roller pair acting on the recording surface and the problem caused by the flatness are inconspicuous. Is preferable. According to the study by the present inventors, if the platen is installed in a range of 30 degrees or more and 60 degrees or less, preferably 40 degrees or more and 50 degrees or less from the horizontal direction, the above problem is not conspicuous and a suitable image can be recorded as a recording medium. It was confirmed that it can be recorded in.

1 Inkjet recording device 5A 1st cassette (A4)
5B 2nd cassette (A3)
7 Conveying roller 7a Pinch roller 7b Spur 8 Recording head 8a Discharge port surface (recording unit)
9 Platen 12 Discharge roller 13 Discharge tray S Recording medium

Claims (12)

The first loading unit for loading the first recording medium and
A second loading unit that is arranged below the first loading unit and can load a second recording medium that is larger than the first recording medium.
The recording medium is arranged above the first loading section and has a plurality of ejection ports provided with a plurality of ejection ports, and is supplied from the first loading section or the second loading section. A recording head that ejects ink for recording,
A platen that supports the back surface of the recording medium at a predetermined angle in the horizontal direction at a position facing the ejection port surface in the recording state where recording is performed by the recording head.
Downstream of the platen in the transport direction of the recording medium, a first transport path for transporting the recording medium on which recording has been performed above the recording head at an angle larger than the predetermined angle with respect to the horizontal direction.
It is an inkjet recording device equipped with
The angle of the discharge port surface in the recording state is different from that in the standby state in which recording is not performed.
The discharge port surface is a position included above the area occupied by the second loading section and is included above the area occupied by the first loading section in both the recording state and the standby state. An inkjet recording device characterized by being in a non-position. A discharge unit is provided above the recording head and ejects a recording medium on which recording is performed by the recording head.
The inkjet recording apparatus according to claim 1, wherein the discharge unit is arranged above an area occupied by the second loading unit. A second transport path for feeding the recording medium from the first loading unit to the platen, and
A third transport path for feeding the recording medium from the second loading section to the second transport path is provided.
The inkjet recording apparatus according to claim 1 or 2, wherein when an image is recorded on the back surface of the recording medium by the recording head, the recording medium is conveyed from the first transport path to the third transport path. .. The inkjet recording apparatus according to claim 3, wherein the ejection port surface is inclined at an angle of 30 degrees or more and 60 degrees or less with respect to the horizontal direction in the recording state. The inkjet recording apparatus according to claim 4, wherein the ejection port surface is inclined at an angle of 40 degrees or more and 50 degrees or less with respect to the horizontal direction in the recording state. The inkjet recording apparatus according to claim 5, wherein the ejection port surface is inclined at an angle of 45 degrees with respect to the horizontal direction in the recording state. The inkjet recording apparatus according to any one of claims 1 to 6, wherein a plurality of ejection ports are arranged on the ejection port surface in a region corresponding to the width of the recording medium. The inkjet recording apparatus according to any one of claims 1 to 7, further comprising a supply unit for supplying ink from an ink tank for accommodating ink to the recording head. It is equipped with an ink tank for accommodating ink and a maintenance unit for performing maintenance operations on the recording head.
The inkjet recording apparatus according to any one of claims 1 to 8, wherein the ink tank and the maintenance unit are arranged above an area occupied by the second loading unit. The maintenance unit moves to a first position where the maintenance operation can be executed and a second position where the maintenance operation cannot be executed.
The inkjet recording apparatus according to claim 9, wherein the ink tank is located above the maintenance unit when the maintenance unit is located at the second position. The inkjet recording apparatus according to any one of claims 1 to 10, wherein the angle of the ejection port surface is changed by rotating the recording head. The inkjet recording apparatus according to any one of claims 1 to 11 , wherein the ejection port surface does not face the platen in the standby state.

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