JP6708988B2 - Recording device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device for recording on a medium, and more particularly to a recording device capable of recording on both sides of the medium.

There is an inkjet printer as an example of a recording device. In the inkjet printer, recording is performed on a first surface of a recording sheet as an example of a medium, and then the recording paper is reversed, and recording is performed on a second surface which is a back surface of the first surface. Some are configured to be executable, i.e., double-sided recordable.

When performing printing on both sides of a sheet, the inkjet recording apparatus described in Patent Document 1 ejects the sheet after one-side (first side) printing onto a sheet ejection tray outside the apparatus main body by a sheet ejection roller, With the printing surface facing upward, the printer waits on the paper discharge tray until the waiting time corresponding to the ink amount for single-sided printing elapses. Then, after the lapse of the waiting time, the paper is conveyed to the printing position by the inkjet head, printed on the other surface (second surface), and ejected. According to this, the image quality of double-sided printing is stable, and downsizing can be achieved.

JP, 2009-083225, A

By the way, since the paper swells by absorbing the ink, the paper on which recording is performed on the first surface tends to warp with the first surface side being convex. Then, when such a sheet is turned upside down, the sheet is warped with the second surface side concave, so that the leading edge and the trailing edge of the sheet are raised when printing on the second side, and May rub against the recording head, or the gap between the head and the paper may become inadequate, resulting in deterioration of recording quality.
Therefore, the present invention has been made in view of such a situation, and an object thereof is to prevent or suppress deterioration of recording quality during double-sided recording, especially during second-side recording.

A recording apparatus according to a first aspect of the present invention for solving the above-mentioned problems is a transport path for transporting a medium, and passes through a recording unit that performs recording on the medium, and is provided on the upstream side and the downstream side of the recording unit. A first transport path that extends and a transport path that is connected to the first transport path and that transports the medium that has passed through the recording unit and then switches it back to transport in a direction opposite to the transport direction. And a third transport path which is a transport path connected to the second transport path, in which the medium transported in the opposite direction is reversed and merges at a position upstream of the recording unit in the first transport path, A transport path connected to the first transport path, which bends, reverses, and ejects the medium that has passed through the recording unit, wherein the second transport path is the first transport path. It is characterized in that the medium which has passed through the path is curved with the first surface facing the recording head constituting the recording section facing inward.

According to this aspect, after the medium that has passed through the recording unit is fed, the second transport path that switches back and transports the medium in the direction opposite to the feed direction is the recording unit in the medium that has passed the first transport path. Since the first surface, which faces the recording head constituting the above, is curved with the first surface facing inward, the medium is in a state in which the second surface side opposite to the first surface is convex. As a result, the rising of the front end or the rear end during the second surface recording is suppressed, and the deterioration of the recording quality during the second surface recording can be prevented or suppressed.

Note that, hereinafter, for convenience, the second transport route may be referred to or referred to as a "switchback route", and the third transport route may be referred to or referred to as a "reverse route". Further, hereinafter, the fourth transport path may be referred to as or be additionally described as a “face-down discharge path”.

A second aspect of the present invention is characterized in that, in the first aspect, the second transport path is formed along the fourth transport path.

According to this aspect, the second transport path (switchback path) is formed along the fourth transport path that bends the medium that has passed through the recording unit, reverses the medium, and ejects the medium. The transport route (switchback route) and the fourth transport route do not occupy regions independently in the recording apparatus, and the size of the apparatus can be further reduced.

According to a third aspect of the present invention, in the first or second aspect, the roller in contact with the first surface of the medium in the second transport path is a serrated roller having a plurality of teeth on its outer circumference. To do.

According to this aspect, since the roller that is in contact with the first surface of the medium in the second transport path (switchback path) is a serrated roller having a plurality of teeth on the outer circumference, the transfer on the first surface, that is, the recorded surface is performed. And white spots can be suppressed.

According to a fourth aspect of the present invention, in any one of the first to third aspects, a first transport unit that transports the medium in the first transport path, and a second transport that transports the medium in the second transport path. It is characterized in that it can be driven independently of the means.

According to this aspect, the first transport unit that transports the medium in the first transport route and the second transport unit that transports the medium in the second transport route (switchback route) can be independently driven. Therefore, the degree of freedom of control in the second transport route (switchback route) is improved, and the degree of habit in the second transport route (switchback route) can be adjusted to obtain a good recording result. ..

In a fifth aspect of the present invention, in any one of the first to fourth aspects, the medium heading from the second transport path to the third transport path is a roller pair provided at the end of the second transport path. And is curved with the first surface facing inward.

According to this aspect, the medium traveling from the second transport path (switchback path) to the third transport path (reversal path) is the roller pair provided at the end of the second transport path (switchback path). In the downstream, since the first surface is curved with the first surface inward, in addition to the second transport path (switchback path), in the downstream of the roller pair provided at the end of the second transport path (switchback path). It is possible to give the medium a habit (a habit with the second surface side being convex). As a result, it is possible to more reliably suppress the floating of the front end or the rear end of the medium, particularly during recording on the second surface.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the first surface of the medium on the upstream side of the roller pair immediately before joining the first transport path in the third transport path. The roller in contact with is a serrated roller having a plurality of teeth on its outer circumference.

According to this aspect, the roller that is in contact with the first surface of the medium on the upstream side of the roller pair immediately before joining the first transportation path in the third transportation path (reversal path) has a plurality of teeth on the outer circumference. Since it has a serrated roller, it is possible to suppress transfer and white spots on the recording surface.

A seventh aspect of the present invention is characterized in that, in any of the first to sixth aspects, the medium is fed to the third transport path after the transport of the medium is stopped for a predetermined time in the second transport path. And

According to this aspect, since the medium is fed to the third transport route (reversal route) after the transport is stopped for a predetermined time in the second transport route (switchback route), the tendency toward the medium (second surface side) Is more prominent), it is possible to more reliably suppress the rising of the front end or the rear end during recording on the second surface.

According to an eighth aspect of the present invention, in the second aspect, the second transport path is formed such that the medium can project from a downstream end portion in the medium transport direction when the medium that has passed through the recording unit is fed. The state in which the medium is projected from the second transport path and the state in which the medium is ejected from the fourth transport path are controlled not to be formed at the same time.

According to this aspect, since the second transport path (switchback path) is formed so that the medium can project from the downstream side end portion in the medium transport direction when the medium that has passed through the recording unit is fed, it is long. It can also be applied to other media. The state in which the medium is projected from the second transport path (switchback route) and the state in which the medium is discharged from the fourth transport path (face-down discharge route) are controlled so as not to be formed at the same time. The medium protruding from the second transport path (switchback path) and the medium discharged from the fourth transport path (face-down discharge path) do not overlap with each other, and the recording surface is prevented from being contaminated due to the overlapping of the media. be able to.

1 is an external perspective view of an inkjet printer according to the present invention. FIG. 3 is a side cross-sectional view showing a sheet conveyance path of the inkjet printer according to the present invention. FIG. 3 is a side cross-sectional view showing a sheet conveyance path of the inkjet printer according to the present invention. FIG. 3 is a side cross-sectional view showing a sheet conveyance path of the inkjet printer according to the present invention. FIG. 3 is a side cross-sectional view showing a sheet conveyance path of the inkjet printer according to the present invention. FIG. 3 is a side cross-sectional view showing a sheet conveyance path of the inkjet printer according to the present invention. FIG. 3 is a side cross-sectional view showing a sheet conveyance path of the inkjet printer according to the present invention. FIG. 3 is a side cross-sectional view showing a sheet conveyance path of the inkjet printer according to the present invention. FIG. 3 is a side cross-sectional view showing a sheet conveyance path of the inkjet printer according to the present invention. (A) And (B) is an enlarged view of the principal part of the paper conveyance path of the inkjet printer which concerns on this invention. (A) And (B) is an enlarged view of the principal part of the paper conveyance path of the inkjet printer which concerns on this invention. FIG. 3 is an enlarged view of a main part of a paper transport path of the inkjet printer according to the present invention. 6 is a flowchart showing control during double-sided recording.

Hereinafter, one embodiment of the present invention will be described based on the drawings, but the present invention is not limited to the embodiment described below, and various modifications can be made within the scope of the invention described in the claims. However, assuming that they are also included in the scope of the present invention, one embodiment of the present invention will be described below.

FIG. 1 is an external perspective view of an inkjet printer (hereinafter referred to as “printer”) 1 which is an embodiment of a “recording device” according to the present invention, and FIGS. 2 to 9 are side cross-sectional views showing a paper transport path of the printer 1. 10(A), (B), FIG. 11(A), (B), and FIG. 12 are enlarged views of the main part of the paper transport path of the printer 1. FIG. 13 is a flow chart showing the control during double-sided recording.

Hereinafter, the overall configuration of the printer 1 that performs inkjet recording on a recording sheet as an example of a medium will be outlined with reference to FIGS. 1 and 2.
In FIG. 1, the inkjet printer 1 includes a scanner device 3 on an upper part of a device main body 2A that performs recording on recording paper, and includes additional units 2B and 2C below the device main body 2A. The apparatus main body 2A includes a paper cassette 10A, the expansion unit 2B includes a paper cassette 10B, and the expansion unit 2C includes a paper cassette 10C. These expansion units 2B and 2C are optional units for increasing the number of sheets to be accommodated, and are optionally attached to the apparatus main body 2A.

Reference numeral 5 is an operation unit for performing various operations of the printer 1, reference numeral 4 is a tray for receiving the recording paper that is recorded and ejected, and more specifically, the recording surface on which the most recent recording is performed. It is a face-down paper ejection tray that receives recording paper ejected downward. Further, reference numeral 35 is a feeding unit, which can be opened and closed with respect to the apparatus main body 2A by rotating about a rotation fulcrum not shown. Reference numeral 6 denotes a manual paper feeding tray provided in the feeding unit 35, which can be opened and closed by rotating about a rotating shaft 6a shown in FIG. The manual paper feed tray 6 shown in FIG. 2 is in the storage posture, and opens in the clockwise direction from the state of FIG.

In the printer 1, the side on which the operation unit 5 is arranged is the front side of the apparatus, and the side on which the manual feed tray 6 is provided is the right side surface of the apparatus. That is, the feeding, conveying, and discharging of the paper in the printer 1 are performed along the lateral direction of the device. A face-up discharge tray 7 (FIG. 2) described later is provided on the left side surface of the device (not shown in FIG. 1).

Next, the paper transport path in the printer 1 will be outlined with reference to FIG. The printer 1 includes a feeding path from the paper cassette 10A (see cassette feeding locus S1), a feeding path from the additional cassettes 10B and 10C (not shown in FIG. 2) (see additional cassette feeding locus S2), and a manual feed tray. These three sheet feeding routes are the feeding route from 6 (see the manual feeding route S3).

In addition, the printer 1 ejects face-up ejection with the recording surface on which the most recent recording is performed facing up (see face-up ejection trajectory T1) and face-down ejection with the recording surface on which the most recent recording is performed facing down. (See face-down discharge trajectory T2).

In FIG. 2, reference numeral 7 indicates a face-up paper discharge tray that receives the paper to be discharged face-up. The face-up paper discharge tray 7 can be placed in the stored state shown in FIG. 2 and the open state (not shown) by rotating about the rotating shaft 7a.

Then, the printer 1 serves as a recording conveyance route R1 as a “first conveyance route”, a switchback route R2 as a “second conveyance route”, an inversion route R3 as a “third conveyance route”, and a “fourth conveyance route”. The face-down discharge path R4 and the face-up discharge path R5 are provided.

Of the above five sheet conveyance paths, the paths other than the face-up discharge path R5 will be described in detail later with reference to FIG. 3 and subsequent figures, and here, only the face-up discharge path R5 will be outlined.

In FIG. 2, reference numeral 33 indicates a flap (path switching member) driven by a drive source (not shown), and switches between the state shown by the solid line and the reference numeral 33 and the state shown by the virtual line and the reference numeral 33′ in FIG. ..

When the flap 33 is in the state shown by the solid line in FIG. 2, the recording sheet is guided to the face-down discharge path R4 and is discharged face-down as shown by the face-down discharge trajectory T2. When the flap 33 is in the state of the phantom line in FIG. 2 and reference numeral 33', the recording sheet is guided to the face-up discharge path R5 and is discharged face-up as shown by the face-up discharge trajectory T1.

In FIG. 2, reference numeral 9 indicates a control unit that performs various controls. The control unit 9 controls the inkjet recording head 8 described later, various rollers driven by a motor (not shown), and each path switching member (flap), and also detects various sensors (not shown) (eg, passage of recording paper). Perform necessary control based on the detection status of the sensor. Note that the control unit 9 is conceptually shown in FIG. 2, and is actually constituted by a circuit board provided at a predetermined position in the apparatus main body 2A.
Hereinafter, the sheet feeding path to the pair of transport rollers 17 will be described with reference to FIG.

The paper cassette 10A detachably provided in the apparatus main body 2A includes a hopper 11, and the recording paper P stored in the paper cassette 10A is moved by a motor (not shown) by swinging the hopper 11 around a shaft 11a. The feeding roller 12 is driven to rotate by the contacting and separating.

The recording sheet sent from the sheet cassette 10A by the feeding roller 12 is separated (prevents double feeding) by passing through the nip position of the separation roller pair 13, and receives the feeding force from the conveyance roller pair 14 to receive the conveyance roller pair. Reach 17. The additional units 2B and 2C (FIG. 1) located below the apparatus main body 2A are also provided with the feeding roller 12 and the separating roller 13, and the recording paper P fed from each paper cassette is the transportation roller shown in FIG. Receiving the feeding force from the pair 14, it reaches the conveying roller pair 17.
The recording paper P supplied through the manual paper feed tray 6 receives the feeding force from the feeding roller pair 15 and reaches the conveyance roller pair 17.

Hereinafter, with reference to FIG. 3, the paper transport path downstream of the transport roller pair 17 will be described. Note that FIG. 3 and the subsequent figures are shown on the premise that the recording sheet is discharged face down through the face down discharge route R4, and the following description will be made on the premise.

First, the rollers provided in each sheet transport path will be described. In FIG. 2, reference numerals 17 to 29 denote all conveying roller pairs that convey the recording sheet. In particular, the rollers on one side of the conveying roller pairs 19 to 28 are indicated by reference numeral F, and the rollers on the other side are indicated by reference numeral G. Be done. The roller F is a drive roller driven by a motor (not shown), and is, for example, a plurality of rubber rollers provided at appropriate intervals in the paper width direction.

The roller G is a driven roller that is driven to rotate in contact with the recording sheet, and is provided in a pair with the roller F at appropriate intervals in the sheet width direction. The roller G is a serrated roller having a plurality of teeth on its outer periphery, and makes point contact with the recording surface to suppress white spots and transfer of ink on the already recorded surface.
The driven roller G is provided at an appropriate position on the paper transport path, in addition to configuring each transport roller pair, and is particularly provided on the side in contact with the already-recorded surface.

On the other hand, the transport roller pairs 17, 18, and 29 are different in configuration from the transport roller pairs 19 to 28. Specifically, the transport roller pair 17 includes a driving roller 17a that is rotationally driven and a driven roller 17b that can be driven and rotated, and the driven roller 17b is a resin roller having a smooth outer peripheral surface. Similarly, the transport roller pair 18 includes a driving roller 18a that is rotationally driven and a driven roller 18b that can be driven and rotated, and the driven roller 18b is a resin roller having a smooth outer peripheral surface. Similarly, the pair of transport rollers 29 includes a driving roller 29a that is rotationally driven and a driven roller 29b that can be driven and rotated, and the driven roller 29b is a resin roller having a smooth outer peripheral surface.

The recording paper is guided between the rollers by the upper and lower guide members. In FIG. 3 and other drawings, reference numerals are not attached to the guide members in order to avoid complication of the drawing, but a thick line connecting each roller shows the guide member.

Next, each sheet transport path (R1 to R4) will be described.
The recording conveyance path R1 as the first conveyance path passes under the inkjet recording head 8 as a recording unit that records on a recording sheet and extends upstream and downstream thereof. In the present embodiment, for convenience, the recording conveyance path R1 is generally set to the positions M1 to M2 in FIG. In the recording conveyance path R1, the recording paper receives the feeding force from the conveyance roller pairs 17, 18, and 19.

In the present embodiment, the inkjet recording head 8 is a recording head provided with nozzles for ejecting ink so as to cover the entire area in the paper width direction, and prints on the entire paper width without moving in the paper width direction. It is configured as a recording head capable of

The switchback route R2 as the second transport route is a transport route that is connected to the recording transport route R1 and is switched back after the recording paper that has passed under the inkjet recording head 8 is fed (left direction in FIG. 3). Is a path for conveying in a direction opposite to the feeding direction (rightward in FIG. 3), and is located inside the curve with respect to a face-down discharge path R4 described later. In the present embodiment, for convenience, the switchback route R2 is generally on the left side of the position M3 in FIG. In the switchback route R2, the recording paper receives the feeding force from the pair of transport rollers 26.

The reversing route R3 as the third transporting route is a transporting route connected to the switchback route R2, and bypasses the recording paper transported in the reverse direction (rightward in FIG. 3) above the inkjet recording head 8. Then, the recording sheet is reversed and merged at a position on the upstream side of the inkjet recording head 8 in the recording conveyance path R1 (upstream position of the conveyance roller pair 17 in this embodiment). In this embodiment, for the sake of convenience, the reversal route R3 is a route from the position M3 to the position M4 in FIG. In the reversing path R3, the recording sheet receives the feeding force from the pair of conveying rollers 27, 28, 29.

The face-down discharge route R4 as the fourth transport route is a transport route connected to the recording transport route R1, and the recording paper passing under the inkjet recording head 8 is placed with the surface facing the inkjet recording head 8 inside. It is a path for bending, inverting and discharging. In this embodiment, for the sake of convenience, the face-down discharge route R4 is generally on the left side of the position M2 in FIG. In the face-down discharge route R4, the recording paper receives the feeding force from the transport roller pairs 20, 21, 22, 23, 24, 25.

Next, a first flap 31 and a second flap 32 as a path switching member that switches the transportation paths are provided at the connection portion of each transportation path. Hereinafter, these flaps will be described with reference to FIG.
The first flap 31 can swing about a swing fulcrum 31a by receiving a driving force from a driving unit (not shown). The second flap 32 is provided so as to be engageable with the first flap 31 via an engaging portion (not shown), and swings around the swing fulcrum 32a in accordance with the swing of the first flap 31.

In the state of FIG. 10A, the first flap 31 guides the recording sheet from the recording conveyance route R1 to the switchback route R2, and the second flap 32 forms a connection route from the recording conveyance route R1 to the switchback route R2. Open. The broken line in FIG. 10A indicates the locus of passage of the paper from the recording conveyance route R1 toward the switchback route R2.

In the state of FIG. 10B, the first flap 31 guides the recording paper from the recording conveyance path R1 to the face-down discharge path R4 (or the face-up discharge path R5), and the second flap 32 switches the recording paper back. The route R2 is guided to the reverse route R3. Further, the second flap 32 blocks the connection path between the recording conveyance path R1 and the switchback path R2 so that the recording paper does not enter the recording conveyance path R1 from the switchback path R2. In FIG. 10(B), the broken line shows the passage of the recording paper from the recording conveyance route R1 toward the face-down discharge route R4 (or face-up discharge route R5), and also from the switchback route R2 to the reverse route R3. The locus of passing recording paper is shown.

Next, an example of sheet conveyance in the sheet conveyance path of the printer 1 configured as above will be described with reference to FIG.
In FIG. 4, reference numeral P1 indicates the first recording sheet to be recorded. When recording is performed on the first surface of the recording paper P1, the recording paper P1 is sent to the switchback route R2 as shown in FIG. At that time, the sheet is also fed from the sheet cassette 10A in parallel, and the second recording sheet P2 is fed to the upstream position of the pair of transport rollers 17.

Next, the first recording sheet P1 is switched back and sent to the reversing path R3 as shown in FIGS. The second recording sheet P2 is sent to the switchback route R2.

Next, the recording paper P1 fed into the reversing path R3 is reversed and fed again below the inkjet recording head 8 as shown in FIG. 8, and the second surface which is the surface opposite to the first surface. Is recorded against. The second recording sheet P2 is switched back and moves toward the reversing path R3. Further, in parallel, the paper is also fed from the paper cassette 10A, and the third recording paper P3 is fed to the upstream position of the transport roller pair 17.

Next, the first recording sheet P1 on which the recording is performed on the second side passes through the face-down discharge route R4 as shown in FIG. 9 and is discharged face-down thereafter. The second recording sheet P2 is inverted by the inversion path R3, and thereafter recording is performed on the second surface. The third recording sheet P1 is printed on the first side and is guided to the switchback route R2.
Thereafter, a series of processes such as feeding the recording sheets sequentially, recording on the first side, reversing, recording on the second side, and discharging are sequentially performed in the same manner as the fourth sheet, the fifth sheet,....

The control unit 9 of the printer 1 corrects the skew of the recording sheet by using the transport roller pair 29 in the reversing path R3 and abutting the leading edge of the sheet against the transport roller pair 17 in the state where the rotation is stopped. So-called skew removal is performed.

Since the printer 1 according to the present embodiment has the dedicated switchback route R2 as described above, it is almost unnecessary to wait for the processing of the preceding recording sheet, and the recording sheet can be sequentially and promptly sent to the next conveying route. it can. As a result, the printer 1 can further improve the throughput.

Subsequently, the characteristic configuration of the printer 1 according to the present invention configured as described above will be further described.
First, in the printer 1, the switchback path R2 is configured such that the recording paper that has passed through the recording conveyance path R1 is curved with the first surface facing the inkjet recording head 8 facing inward.

The effects of this configuration are as follows. That is, since the recording paper swells by absorbing the ink, the recording paper on which the first surface is recorded tends to warp with the first surface side being convex. Then, when such a recording sheet is reversed, the recording sheet is warped with the second surface side concave, so that the leading edge and the trailing edge of the sheet are lifted when recording on the second surface, and the leading edge of the sheet is lifted. Alternatively, the trailing edge may rub against the ink jet recording head 8, or the gap between the ink jet recording head 8 and the recording paper may become improper, leading to deterioration in recording quality.

However, in the printer 1 according to the present invention, as described above, the switchback route R2 is configured such that the recording paper that has passed through the recording transport route R1 is curved with the first surface facing the inkjet recording head 8 facing inward. Therefore, the recording sheet is in a state of being bent with the second surface side opposite to the first surface being convex. As a result, the rising of the front end or the rear end during the second surface recording is suppressed, and the deterioration of the recording quality during the second surface recording can be prevented or suppressed.

Further, since the switchback route R2 is formed along the face-down discharge route for curving, reversing and discharging the recording paper that has passed under the inkjet recording head 8, the switchback route R2 and the face-down discharge route are formed. Since and do not occupy regions independently in the device, the device can be further downsized.

Further, the driven roller G, which is a roller that is in contact with the first surface (the surface on which recording is first performed) of the recording paper in the switchback route R2, is a serrated roller having a plurality of teeth on the outer periphery, and therefore the first surface, that is, the existing surface. It is possible to suppress transfer and white spots on the recording surface.

Further, if the transport roller pair 17, 18, 19 for transporting the recording paper in the recording transport route R1 is the first transport means, and the transport roller pair 26 for transporting the recording paper in the switchback route R2 is the second transport means, In the embodiment, the first transport means and the second transport means are configured to be independently drivable. Therefore, the degree of freedom of control in the switchback route R2 is improved, and the degree of habit in the switchback route R2 can be adjusted to obtain a good recording result.

Here, the degree of habit in the switchback route R2 can be adjusted by adjusting the stop time of the transport roller pair 26. This adjustment will be described with reference to FIG.
FIG. 13 shows a flow of the recording operation for one recording sheet. For example, when the recording sheet P1 shown in FIGS. 4 to 9 is described as an example, first, the sheet is fed (step S101) and the first sheet is fed. Recording is performed on the surface (step S102: FIG. 4) and the recording is sent to the switchback route R2 (step S103: FIG. 5).

The recording paper P1 sent to the switchback path R2 is switched in the conveyance direction (switchback) in a state where the trailing edge at the time of recording on the first surface is nipped by the conveyance roller pair 26 as shown in FIG. At this time, by stopping the driving of the transport roller pair 26 for a predetermined time, that is, by providing a weight for the time t1 (step S104), the recording paper in the state where the second surface side opposite to the first surface is convex , The second surface side is made to be convex, and the habit is surely performed.

Next, the recording paper P1 is fed to the reversing path R3 (step S105: FIG. 7), reversed (step S106: FIG. 8), and recording is performed on the second surface (step S107: FIG. 8). The recording paper P1 on which the second surface is recorded is sent to the face-down discharge path R4 (step S108: FIG. 9) and discharged (step S109).

The wait time t1 can be adjusted according to the contents of the first side recording. For example, when recording on the first side is only text printing with a small ink ejection amount, the wait time t1 may be shortened or set to zero. Of course, when recording is not performed on the first side but only on the second side, the wait time t1 may be set to zero. In addition, the wait time t1 may be adjusted according to the print duty value during the first surface recording.

Here, the print duty value is a ratio of ink covering a unit area of the print surface. For example, with a print duty value of 50%, 50% of the unit area of the print surface is covered with ink.

Then, for example, if the recording duty value is high, the degree of swelling due to ink absorption, that is, the floating of the sheet during the second surface recording becomes remarkable, so the wait time t1 is lengthened. Conversely, if the print duty value is low, the wait time t1 is shortened (including zero).

By doing so, it is possible to effectively suppress the lifting of the leading edge or the trailing edge area at the time of the second surface recording while suppressing the decrease of the recording throughput, and prevent the deterioration of the recording quality at the time of the second surface recording. Can be suppressed or suppressed.

Further, focusing on the suppression of lifting of the leading edge or trailing edge area during the second surface recording, the recording duty value may be the recording duty value of the leading edge or the trailing edge area of the paper during the first surface recording. Thus, for example, even if the recording duty value is high in the central area of the paper, if the recording duty value of the leading or trailing edge area of the paper is low, the wait time t1 can be short, and the prevention of deterioration in recording quality and the prevention of deterioration in throughput are both achieved. be able to.

Further, the wait time t1 may be adjusted according to the paper type. For example, when the recording paper is thick like glossy paper, the degree of swelling due to the absorption of ink, that is, the floating of the paper at the time of recording on the second surface is small, so the wait time t1 is shortened or set to zero. To do. On the other hand, when the recording paper is such that the degree of swelling due to the absorption of ink is remarkable like the thin plain paper, the wait time t1 is lengthened.

By adjusting the wait time t1 in accordance with the type of paper in this way, it is possible to more appropriately and reliably suppress the lifting of the leading edge or the trailing edge area during the second surface recording, and reduce the recording quality during the second surface recording. It can be prevented or suppressed.

Further, by utilizing the characteristics of the sheet transport path according to the present embodiment, the following can be performed. In FIG. 6, the leading edge of the recording sheet extending from the switchback route R2 to the reversal route R3 is a curved section A2 downstream (on the right side in the figure) of the transport roller pair 26 provided at the end of the switchback route R2. It is curved with the upper side in the drawing as the inside.
The curvature of the curved section A2 is larger than the curvature of the curved section A1 in the switchback route R2 in the present embodiment.

Therefore, in addition to the switchback path R2, a stronger habit (a habit of making the second surface side convex) is provided to the leading edge or the trailing edge of the recording paper downstream of the transport roller pair 26 provided at the end of the switchback path R2. )It can be performed. In particular, if the wait time t2 is provided in the state as shown in FIG. 6, it is possible to more reliably suppress the floating of the leading edge or the trailing edge of the recording sheet, particularly during the second surface recording. Both the wait time t1 and the wait time t2 may be set, or only one of them may be set.

Next, the features of the printer 1 according to the present invention will be further described. Since the driven roller G that is in contact with the first surface of the recording paper on the upstream side of the pair of transport rollers 29 immediately before joining the recording transport path R1 in the reverse path R3 is a serrated roller having a plurality of teeth on the outer circumference, It is possible to suppress the transfer and white spots in.

Further, in the present embodiment, the switchback route R2 is formed so that the recording sheet can project from the downstream side end portion in the transport direction when the recording sheet passing under the inkjet recording head 8 (passing the recording transport route R1) is fed. Has been done. FIG. 11B shows this state, and the recording paper P5 is in a state of protruding outward from the switchback path R2. Since the recording paper can be projected from the switchback route R2 in this way, it is not necessary to extend the switchback route R2 even when reversing a large-sized (long length) recording paper, and the enlargement of the apparatus is suppressed. it can.

In this embodiment, control is performed so that the state in which the recording sheet projects from the switchback route R2 and the state in which the recording sheet is ejected from the face-down discharge route R4 do not occur at the same time. FIG. 11A shows a state where the recording paper P4 is discharged from the face-down discharge path R4, that is, the control unit 9 of the printer 1 shows the state shown in FIG. 11A and the state shown in FIG. 11B. Control so that the state and the state do not occur at the same time.

As a result, the recording paper (projection P5 in FIG. 11) protruding from the switchback path R2 and the recording paper (projection P4 in FIG. 11) ejected from the face-down ejection path R4 do not overlap, but the recording papers overlap. It is possible to prevent the recording surface from becoming dirty.

When a paper jam occurs in the switchback route R2 or the face-down discharge route R4, the jam clearance work can be easily performed by the route opening mechanism shown in FIG. In FIGS. 12 and 2, reference numeral 34 indicates a transport unit, and the transport unit 34 is provided slidably with respect to the apparatus main body 2A (FIG. 1). The transport unit 34 integrally includes a part of rollers and a path forming member that configure the switchback path R2 and the face-down discharge path R4, and when pulled out from the mounted state (FIG. 2) as shown in FIG. The switchback route R2 is largely opened, and the face-down discharge route R4 is also separated in the middle. As a result, even when a paper jam occurs in the switchback route R2 or the face-down discharge route R4, it is possible to easily perform the jam handling work.

In the present embodiment, the inkjet recording head 8 is a recording head provided with nozzles for ejecting ink so as to cover the entire area in the paper width direction, and prints on the entire paper width without moving in the paper width direction. Although it is configured as a recording head capable of performing the above, it may be configured as a recording head capable of performing recording in the entire sheet width while moving in the sheet width direction.
Further, the face-down discharge route R4 (fourth transport route) does not necessarily have to be formed along the switchback route (second transport route).

1 inkjet printer, 2A main unit, 2B, 2C expansion unit, 3 scanner section, 4 face-down discharge tray, 5 operation panel, 6 manual feed tray, 7
Face-up discharge tray, 8 recording head, 9 control unit, 10A to 10C paper cassette, 11 hopper, 12 feeding roller, 13 separation roller pair, 14 conveyance roller pair, 15 feeding roller pair, 17 to 29 conveyance roller pair , 31 First flap, 32
2nd flap, 33 flap, 34 transport unit, 35 feeding unit, F drive roller, G driven roller, R1 recording transport path (first transport path), R2 switchback path (second transport path), R3 reverse path ( 3rd transport route), R4 face-down discharge route (4th transport route), R5 face-up discharge route, P, P1, P2, P3, P4, P5 recording paper, S1 cassette feeding trace, S2 expansion cassette feeding trace , S3 Manual feeding locus, T1 face-up ejection locus, T2 face-down ejection locus

Claims (16)

A medium storage unit for storing a medium;
A transport path for transporting a medium that is fed from the medium accommodating portion and is curved and inverted upward, and passes through a recording portion that performs recording on the medium and extends to the upstream side and the downstream side of the recording portion. The route,
A second transport path that is connected to the first transport path and that transports the medium that has passed through the recording unit and then switches it back to transport in a direction opposite to the transport direction;
A third transport path which is a transport path connected to the second transport path and which reverses the medium transported in the opposite direction and merges at a position on the upstream side of the recording unit in the first transport path;
A transport path connected to the first transport path, wherein the medium that has passed through the recording unit is curved upward, inverted, and discharged from a discharge port,
Before Stories second conveying path includes a curved path to curve to the first surface opposed to the recording head constituting the recording unit in the medium passing through said first conveying path on the inside,
The entire second transport path is located between the height position of the first transport path and the height position of the discharge port of the fourth transport path in the device height direction ,
A recording device characterized by the above. The recording apparatus according to claim 1,
The forward direction for feeding the medium through the recording unit in the center of the second transport path, the direction of rotation the medium fed to the second conveying path in a reverse direction to convey the opposite direction the comprise a switchable conveying roller pair in said second transport path,
The pair of transport rollers is arranged on the side where the discharge port is provided with respect to the recording unit in the direction in which the first transport path extends.
A recording device characterized by the above. The recording apparatus according to claim 1 or claim 2, pre-Symbol second transport path, the first surface of the medium recorded by the recording head constituting the recording section, the inner side of the curvature of the curved path is configured to be sent transportable in facing condition, it said curved path is formed along the inside of the curvature of the fourth transport path, that the recording apparatus according to claim. A medium storage unit for storing a medium;
A transport path for transporting a medium that is fed from the medium accommodating portion and is curved and inverted upward, and passes through a recording portion that performs recording on the medium and extends to the upstream side and the downstream side of the recording portion. The route,
A second transport path that is connected to the first transport path and that transports the medium that has passed through the recording unit and then switches it back to transport in a direction opposite to the transport direction;
A third transport path which is a transport path connected to the second transport path and which reverses the medium transported in the opposite direction and merges at a position on the upstream side of the recording unit in the first transport path;
A transport path connected to the first transport path, wherein the medium that has passed through the recording unit is curved upward, inverted, and discharged from a discharge port,
Before Stories second conveying path includes a curved path to curve to the first surface opposed to the recording head constituting the recording unit in the medium which has passed through the first transport path inside the recording constituting the recording portion The first surface of the medium recorded by the head is conveyed in a state of facing the inner side of the curve of the curved path,
The curved path is arranged at a position between the height position of the first transport path and the height position of the discharge port of the fourth transport path, and is inside the curve of the fourth transport path. A recording device characterized by being formed along the line . The recording apparatus according to any one of claims 1 to 4 , further comprising: a discharge tray that receives a medium that has been conveyed and discharged in the fourth conveyance path.
These constituent elements of the medium containing section, the first transport path, the recording section, the third transport path, and the discharge tray are superposed in this order from below the apparatus.
A recording device characterized by the above. The recording apparatus according to any one of claims 1 to 5, wherein the third transport path is formed so as to bypass the upper side of the recording unit,
The entire second transport path and the entire third transport path are located between the height position of the first transport path and the height position of the discharge port of the fourth transport path in the device height direction. Fits in,
A recording device characterized by the above. The recording apparatus according to any one of claims 1 to 6 ,
A first transport means for transporting the medium in the first transport path and a second transport means for transporting the medium in the second transport path, wherein the first transport means and the second transport means are independent of each other. Can be driven by
A recording device characterized by the above. The recording apparatus according to any one of claims 1 to 7 ,
A first flap that switches a downstream side of the first transport path and an upstream side of the second transport path between a connected state and a disconnected state;
A second flap connecting the second transport path and the third transport path in a state where the first flap is switched from the connected state to the non-connected state,
A recording device characterized by the above. The recording apparatus according to claim 8 , wherein the first medium and a second medium subsequent to the first medium are conveyed,
When the first flap is in the connected state, the rear end side in the transport direction of the second medium transported from the first transport path to the second transport path passes through the first flap,
After that, the first flap is switched to the disconnected state,
Then, the first medium is conveyed from the recording unit to the fourth conveyance path, and the second flap is connected to the second conveyance path before the first medium is ejected from the fourth conveyance path. The second medium is transported to the third transport route by connecting to the third transport route.
A recording device characterized by the above. The recording apparatus according to claim 9 ,
Causing the second medium transported to the second transport path to wait in the second transport path for a predetermined time,
A recording device characterized by the above. In the recording device according to claim 9 or 10 ,
In the connected state of the first flap, after the rear end side in the transport direction of the second medium transported from the first transport path to the second transport path has passed the first flap, the first flap is removed. Switch to the disconnected state,
A third medium subsequent to the second medium is fed from the medium accommodating section, and the first flap passes because the third medium passes through the recording section and heads toward the second transport path. Before the connection state is established, the second flap connects the second transport path and the third transport path to transport the second medium to the third transport path.
A recording device characterized by the above. The recording apparatus according to claim 11 ,
The second medium is conveyed toward the third conveyance path before the first medium is ejected from the fourth conveyance path.
A recording device characterized by the above. The recording apparatus according to any one of claims 1 to 12 ,
The recording device is
A transport unit that forms at least a part of the second transport path and at least a part of the fourth transport path,
The transport unit can be pulled out from the main body of the recording apparatus, and by pulling out, the second transport path is opened and the fourth transport path is divided.
A recording device characterized by the above. The recording apparatus according to any one of claims 1 to 13 , wherein the roller that is in contact with the first surface of the medium in the second transport path is a serrated roller having a plurality of teeth on its outer circumference.
A recording device characterized by the above. The recording apparatus according to any one of claims 1 to 14 , wherein the medium heading from the second transport path to the third transport path is downstream of a roller pair provided at the end of the second transport path. Then, it is curved with the first surface inside.
A recording device characterized by the above. The recording apparatus according to any one of claims 1 to 15 , wherein the recording medium is in contact with the first surface of the medium on the upstream side of the roller pair immediately before joining the first transportation path in the third transportation path. The roller is a serrated roller having a plurality of teeth on the outer circumference,
A recording device characterized by the above.

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