JP2018188242A - Recording system and relay unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve both of efficient drying of a medium after recording in a relay unit and suppression of a reduction in throughput, and to achieve both of suppression or avoidance of skew of a sheet introduced to a post-processing device from the relay unit and the suppression of the reduction in throughput.SOLUTION: A control part 27 controlling conveyance operation of a sheet defines a conveyance speed by upstream side conveyance means 84 as a first conveyance speed V1 and defines a conveyance speed by downstream side conveyance means 85 as a second conveyance speed V2 faster than the first conveyance speed V1 in a relay unit 3.SELECTED DRAWING: Figure 1

Description

  The present invention provides a recording unit comprising a recording unit for recording on a paper such as a medium to be transported, a post-processing unit for performing post-processing, and a relay unit for relaying transport of the medium sent from the recording unit to the post-processing unit. The present invention relates to a system and the relay unit.

Conventionally, a recording apparatus (image forming apparatus) that records an image by ejecting ink (liquid) onto paper, which is an example of a medium, and post-processing such as punching processing and stapling processing on the paper on which an image is recorded Recording systems having post-processing devices are known.
As such a recording system, Patent Document 1 discloses a recording device such as a printer that records an image on a sheet (the printer 100 in Patent Document 1), and a post-processing apparatus that performs post-processing on a sheet on which an image is recorded. A configuration having (a post-processing device 300 in Patent Document 1) and a relay unit (a transport device 200 in Patent Document 1) that configures a transport path between the recording apparatus and the post-processing device is disclosed.

JP-A-2006-185867

Here, recording is continuously performed on a plurality of sheets in the recording apparatus, the recorded sheets are sent to the post-processing apparatus via the relay unit, and post-processing such as punching processing and stapling processing is performed. For this reason, for example, in recording with a large amount of ink ejected onto a sheet, the recording surface does not dry, and the recording surface rubs and the recorded image blurs.
If the sheet conveyance speed in the apparatus is decreased, the drying time is secured, but the processing speed per unit time, that is, the throughput is lowered. That is, there is a trade-off relationship between securing the sheet conveyance time required for drying and throughput.

On the other hand, in the conveyance path of the recording apparatus or the relay unit, for example, skew (skew) in which the sheet is conveyed obliquely with respect to the conveyance direction due to various causes such as eccentricity of the rotation shaft of the roller that conveys the sheet and curl of the sheet. ) Is likely to occur. In order to suppress or avoid the occurrence of the skew, a correction unit that corrects the skew of the sheet may be provided in the conveyance path. For example, Patent Document 1 includes an alignment roller pair 149 as the correction unit on the upstream side of the recording unit 110.

  If paper skew occurs in the paper introduced from the relay unit to the post-processing device, it is difficult to properly align or align the paper, and it may be difficult to perform the post-processing properly. For this reason, assuming the case where correction means such as the alignment roller pair 149 is provided on the transport path upstream of the post-processing apparatus, that is, downstream of the relay unit, the following problems occur.

That is, the skew of the sheet is corrected (skewed) with respect to the conveyance direction by the abutting state of the leading end of the sheet that hits the correction unit (the pair of alignment rollers 149). At this time, the conveyance of the paper is temporarily stopped or the conveyance speed is decelerated. Therefore, while the skew removal for the medium conveyed first (hereinafter referred to as the preceding medium) is being performed, the subsequent medium (hereinafter referred to as the subsequent medium). Medium) may collide with the preceding medium.
If the interval between the preceding medium and the succeeding medium is increased, the possibility of the collision can be avoided, but the processing speed (throughput) per unit time decreases.

  Therefore, the present invention has been made in view of such a situation, and an object of the present invention is to provide a recording system including a recording apparatus, a post-processing apparatus, and a relay unit provided between them, after recording in the relay unit. The purpose is to achieve both efficient drying of the medium and suppression of a decrease in throughput. Another object of the present invention is to achieve both the suppression or avoidance of skew of the paper introduced from the relay unit to the post-processing apparatus and the decrease in throughput.

In order to solve the above problems, a recording system according to a first aspect of the present invention includes a recording unit including a recording unit that performs recording by discharging a liquid onto a medium, and the medium on which recording is performed in the recording unit. A post-processing unit that executes post-processing, a relay unit that is disposed between the recording unit and the post-processing unit, and that transports the medium from the recording unit to the post-processing unit; A control unit that controls, the relay unit transports the medium introduced from the recording unit, an upstream transport path, upstream transport means provided in the upstream transport path, and the upstream transport A downstream conveyance path that is connected to the downstream side of the path and conveys the medium toward the post-processing unit; a downstream conveyance means provided in the downstream conveyance path; A downstream conveyance path, provided on the downstream side of the downstream conveyance unit, and a correction conveyance unit that conveys the medium after executing the skew correction operation on the medium, the skew correction operation, The control unit includes an operation in which the leading end of the medium is abutted against the correction transport unit, and the control unit sets the transport speed by the upstream transport unit as a first transport speed, and the transport speed by the downstream transport unit as the first transport speed. The second transport speed is faster than the transport speed.
It is characterized by that.

  According to this aspect, the control unit makes the transport speed (second transport speed) by the downstream transport means faster than the transport speed (first transport speed) by the upstream transport means. The drying time of the recording surface can be ensured in the upstream conveyance path that is conveyed at a conveyance speed (average conveyance speed) that is relatively slower than the conveyance speed (average conveyance speed) in the conveyance path.

The skew feeding correction operation executed in the correction transporting unit includes an operation in which the leading edge of the medium is abutted against the correction transporting unit. May be clogged.
In addition, the preceding medium accompanying skew correction (hereinafter also referred to as skew removal) by the correction transport unit due to the relatively fast transport speed (second transport speed) by the downstream transport unit. And the gap between the following media can be widened. Therefore, the possibility of the collision of the subsequent medium with the preceding medium can be reduced without unnecessarily widening the interval between the preceding medium and the subsequent medium. Accordingly, it is possible to appropriately correct the skew and suppress a reduction in throughput.

  According to a second aspect of the present invention, in the first aspect, the control unit is configured so that the upstream side transport unit transports the liquid when the recording unit ejects the liquid onto the medium at a predetermined threshold value or more. Is the first transport speed, the transport speed by the downstream transport means is the second transport speed that is faster than the first transport speed, and the discharge amount of the liquid onto the medium by the recording unit is less than a predetermined threshold In addition, the transport speed by the upstream transport means is a third transport speed that is faster than the first transport speed, and the transport speed by the downstream transport means is a fourth transport speed that is faster than the third transport speed. It is characterized by.

According to this aspect, the control unit sets the transport speed (second transport speed or fourth transport speed) by the downstream transport means to the transport speed (first transport speed or third transport speed) by the upstream transport means. Therefore, the drying time of the recording surface can be secured in the upstream transport path that is transported at a transport speed that is relatively slower than the downstream transport path.
In addition, when the discharge amount of the liquid onto the medium by the recording unit is less than a predetermined threshold, the transport speed by the upstream transport unit is set to a third transport speed that is faster than the first transport speed. When the discharge amount of the liquid onto the medium by the recording unit is small, the upstream transfer path is transported at a relatively faster speed than when the discharge amount of the liquid onto the medium by the recording unit is large. Therefore, the throughput can be increased.
That is, when the amount of the liquid ejected onto the medium by the recording unit is large, the recording surface is surely dried by slowly transporting the upstream transport path and taking a long transport time, and by the recording unit. When the discharge amount of the liquid onto the medium is small, throughput can be improved by quickly transporting the upstream transport path.
Further, similarly to the first aspect, it is possible to reduce the possibility of collision of the subsequent medium with the preceding medium without unnecessarily widening the interval between the preceding medium and the subsequent medium. Accordingly, it is possible to appropriately correct the skew and suppress a reduction in throughput.

  According to a third aspect of the present invention, in the first aspect or the second aspect, the control unit skews the transport speed of the medium when the leading edge of the medium reaches the correction transport unit. Correction control is executed.

  According to this aspect, the control unit executes the skew correction control for reducing the transport speed of the medium when the leading edge of the medium reaches the correction transport unit, and skews the skew of the medium. Can be corrected.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, an introduction speed of the medium from the recording unit to the upstream transport path is determined by the upstream transport unit. The speed at which the medium is derived from the downstream transport path to the post-processing unit is equal to the transport speed by the downstream transport unit.

In this specification, “constant speed” means that it is only necessary to be substantially constant speed, and means that it is not necessary to be completely constant speed in a strict sense. For example, “constant speed” means that the speed is constant when considering the transport error and the like due to the diameter of a roller such as a transport roller as a transport means and the eccentricity of a rotating shaft, in addition to the completely same case. Including cases that can be considered.
According to this aspect, the introduction speed of the medium from the recording unit to the upstream transport path is the same as the transport speed by the upstream transport means, and the medium from the downstream transport path is Since the delivery speed to the post-processing unit is equal to the transport speed by the downstream transport means, the medium is transferred from the recording unit to the relay unit, or the medium is transferred from the relay unit to the post-processing unit. Delivery can be performed smoothly.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the control unit is transported by the downstream transport unit, and a tip of the control unit reaches the correction transport unit. Controlling the upstream conveying means and the downstream conveying means so as to maintain a predetermined interval between the trailing edge of the preceding medium and the leading edge of the succeeding medium conveyed by the upstream conveying means. It is characterized by.

  According to this aspect, it is possible to avoid a collision between the trailing edge of the preceding medium and the leading edge of the succeeding medium, and suppress the occurrence of conveyance failure.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the liquid is referred to when the control unit controls the upstream side transport unit and the downstream side transport unit. The discharge amount is an average discharge amount in a print job accompanied by one post-processing, or a discharge amount for a medium having the largest discharge amount in the print job.

  According to this aspect, based on the average discharge amount in a print job with one post-processing or the feed / discharge amount with respect to the medium having the largest discharge amount in the print job, the control unit and the upstream transport unit and It can be set as the structure which controls a downstream conveyance means.

  According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the upstream-side transport path is a path that executes a switchback operation that reverses the transport direction of the medium. A first switchback path and a second switchback path; a branch path for sending the medium introduced from the recording unit to either the first switchback path or the second switchback path; A first inversion path for inverting the medium after switchback in one switchback path; a second inversion path for inverting the medium after switchback in the second switchback path; the first inversion path and the second inversion; A merging path that joins the path, and the merging path is connected to the downstream conveyance path.

According to this aspect, the upstream transport path can be configured to include two transport paths: a transport path that passes through the first switchback path and a transport path that passes through the second switchback path. . Thereby, for example, when transporting a plurality of media, the two transport paths can be alternately used to efficiently transport the media.
Further, since the switchback operation is performed in the first switchback path and the second switchback path, the transport distance (transport time) in the upstream transport path is increased, and the drying time of the medium is further increased. It can be configured.

  According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the post-processing unit includes a post-processing unit path that transports the medium derived from the downstream-side transport path. A post-processing path transporting means provided in the post-processing unit path; an intermediate stacker provided downstream of the post-processing path transporting means for temporarily stacking the medium before post-processing; A discharge unit that discharges the medium, and the control unit controls the transfer speed of the post-processing path transfer unit to be equal to that of the downstream transfer unit.

  According to this aspect, the control unit controls the conveyance speed of the post-processing path conveyance unit to be equal to that of the downstream-side conveyance unit, so that an interval between the preceding medium and the subsequent medium is ensured and the intermediate medium is Each medium can be stacked on the stacker and appropriately post-processed.

  A relay unit according to a ninth aspect of the present invention is provided in the upstream transport path for transporting the medium introduced from the recording unit that performs recording by discharging liquid from the recording unit to the medium, and in the upstream transport path. An upstream conveying means connected downstream of the upstream conveying path and conveying the medium toward a post-processing unit that performs post-processing on the medium on which recording has been performed in the recording unit A path, downstream transport means provided in the downstream transport path, and downstream of the downstream transport means in the downstream transport path, and after performing the skew correction operation on the medium, The skew feeding correcting operation includes an operation in which a leading end of the medium is abutted against the correcting transporting means, and controls the medium transporting operation. Parts are the transportation speed by said upstream conveying means to the first transfer speed, and faster second conveying speed than the conveying speed of the downstream conveying means and the first transport speed, characterized in that.

  According to this aspect, in the recording unit configured by providing the relay unit between the recording unit and the post-processing unit, the same effects as those of the first aspect can be obtained.

  According to a tenth aspect of the present invention, in the ninth aspect, the control unit is configured such that when the amount of the liquid discharged from the recording unit onto the medium is equal to or greater than a predetermined threshold, the transport speed by the upstream transport unit is Is the first transport speed, the transport speed by the downstream transport means is the second transport speed that is faster than the first transport speed, and the discharge amount of the liquid onto the medium by the recording unit is less than a predetermined threshold In addition, the transport speed by the upstream transport means is a third transport speed that is faster than the first transport speed, and the transport speed by the downstream transport means is a fourth transport speed that is faster than the third transport speed. It is characterized by.

  According to this aspect, in the recording unit configured by providing the relay unit between the recording unit and the post-processing unit, the same effect as the second aspect can be obtained.

1 is a schematic diagram of a recording system according to the present invention. FIG. 4 is a side sectional view of a part of a recording unit and a relay unit. FIG. 3 is a schematic diagram illustrating a conveyance path of a recording unit. Schematic which shows the conveyance path | route of a relay unit. The figure explaining the conveyance path | route at the time of double-sided recording. Schematic which shows the 1st path | route in a relay unit path | route. Schematic which shows the 2nd path | route in a relay unit path | route. The figure explaining conveyance of the some paper in a relay unit path | route. The figure explaining conveyance of the some paper in a relay unit path | route. The expansion perspective view around the 2nd switchback path. The figure which looked at FIG. 10 from another angle. JJ arrow sectional drawing of the 2nd switchback path | route shown in FIG. KK arrow sectional drawing of the 2nd switchback path | route shown in FIG.

[Example 1]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram of a recording system according to the present invention. FIG. 2 is a side sectional view of a part of the recording unit and the relay unit. FIG. 3 is a schematic diagram illustrating a conveyance path of the recording unit. FIG. 4 is a schematic diagram showing a transport path of the relay unit. FIG. 5 is a diagram for explaining a conveyance path during double-sided recording. FIG. 6 is a schematic diagram showing a first route in the relay unit route. FIG. 7 is a schematic diagram showing a second route in the relay unit route. 8 and 9 are diagrams for explaining the conveyance of a plurality of sheets in the relay unit path. FIG. 10 is an enlarged perspective view around the second switchback path. FIG. 11 is a view of FIG. 10 viewed from another angle. 12 is a cross-sectional view of the second switchback path shown in FIG. 13 is a cross-sectional view taken along the line KK of the second switchback path shown in FIG.

  In the XYZ coordinate system shown in each figure, the X-axis direction is the recording medium width direction, the apparatus depth direction is shown, and the Y-axis direction is the recording medium conveyance direction in the conveyance path in the recording apparatus. The device width direction is shown, and the Z-axis direction is the device height direction.

■■■ Overview of recording system ■■■
A recording system 1 shown in FIG. 1 includes a recording unit 2 that performs recording on a sheet as a “medium”, a relay unit 3, and a post-processing unit 4. As an example, the recording system 1 is provided with a recording unit 2, a relay unit 3, and a post-processing unit 4 in order from the right side to the left side in FIG. 1. The recording unit 2, the relay unit 3, and the post-processing unit 4 are connected to each other so that a medium can be conveyed from the recording unit 2 to the post-processing unit 4.
Further, the recording system 1 is configured such that a recording operation to the medium in the recording unit 2, the relay unit 3, and the post-processing unit 4 can be input from an operation panel (not shown) provided in the recording unit 2. ing.
Hereinafter, schematic configurations of the recording unit 2, the relay unit 3, and the post-processing unit 4 will be described in order.

<<< Recording unit >>>
The recording unit 2 (FIG. 1) includes a printer unit 5 including a line head 10 (FIG. 3) as a “recording unit” that performs recording by discharging ink as an example of “liquid” onto a sheet, and a scanner unit 6. It is configured as a multifunction machine. In the present embodiment, the ink is a water-based ink such as a water-based ink, and the printer unit 5 is a so-called inkjet printer.
The recording unit 2 is configured to be capable of duplex recording in which recording is performed on the second side (also referred to as the back side) by inverting the paper after recording on the first side (also referred to as the front side) of the paper. .

A plurality of paper storage cassettes 7 are provided in the lower part of the recording unit 2 (FIG. 1). The paper stored in the paper storage cassette 7 is sent toward the line head 10 and the recording operation is performed. The sheet after recording by the line head 10 is discharged to either the first discharge unit 8 provided in the recording unit 2 or the second discharge unit 40 as “discharge unit” provided in the post-processing unit 4. It is configured. The medium after the post-processing unit 4 performs post-processing such as cutting and stapling is discharged to the second discharge unit 40.
When the sheet after recording is discharged from the second discharge unit 40, the sheet is sent from the delivery unit 28 to the relay unit 3 and further sent to the post-processing unit 4 through the relay unit 3.
The paper transport path in the printer unit 5 will be described in detail later.

<<< Relay Unit >>>
The relay unit 3 (FIG. 1) is disposed between the recording unit 2 and the post-processing unit 4, receives the paper delivered from the delivery unit 28 by the upstream relay unit 34, and receives the paper after recording to the recording unit 2. To the post-processing unit 4.
Further, the relay unit 3 dries the paper by carrying the paper for a predetermined period or longer. Thereby, it is possible to earn time for transporting the paper.
The sheet conveyed inside the relay unit 3 is sent into the post-processing unit 4 from the downstream relay unit 35 provided in the relay unit 3 via the receiving unit 41 of the post-processing unit 4.
The paper transport path (relay unit path 32) in the relay unit 3 will be described in detail later together with the paper transport path in the printer unit 5.

<<< Post-processing unit >>>
The post-processing unit 4 (FIG. 1) is configured to perform post-processing on the paper recorded in the recording unit 2. Examples of the post-processing include cutting, paper folding, punching, stapling, and sorting.
The paper transport path (post-processing unit path 33) in the post-processing unit 4 will be described later together with the paper transport path in the printer unit 5 and the relay unit path 32.
Hereinafter, the sheet conveyance path in the recording unit 2, the relay unit 3, and the sheet conveyance path in the post-processing unit path 33 will be sequentially described.

■■■ Media transport path of the recording unit ■■■
Next, the sheet conveyance path in the recording unit 2 will be described with reference to FIG.
In FIG. 3, a dotted line indicated by a symbol T indicates a part of the sheet conveyance path from the sheet storage cassette 7. The sheet transport path T includes a feeding path 14 for feeding a sheet picked up from the sheet storage cassette 7 and a straight path 12 connected to the feeding path 14 and including a recording area by the line head 10. Yes.

  Further, on the downstream side of the straight path 12, a first transport path 13 (indicated by a two-dot chain line in FIG. 3) for feeding the paper to the first discharge unit 8 and a delivery for delivering the paper to the relay unit 3 (FIG. 1). A recording unit path 31 (indicated by a one-dot chain line in FIG. 3) that is a path to the transfer unit 28 is provided.

A switching unit 26 such as a guide flap for switching the conveyance destination of the paper after recording between the delivery unit 28 and the first discharge unit 8 at the connection portion of the straight path 12, the first conveyance path 13, and the recording unit path 31. Is provided. The operation of the switching unit 26 is controlled by the control unit 27. The control unit 27 controls operations related to recording such as the operation of the switching unit 26 in addition to the sheet conveying operation in the recording system 1.
In the following, the conveyance of the sheet from the sheet storage cassette 7 to the first discharge unit 8 will be described first, and then the transfer when the recorded sheet is sent to the second discharge unit 40 via the relay unit 3 will be described. To do.

<<< Regarding the paper transport path from the paper storage cassette to the first discharge section >>>
The feeding path 14 is provided with a feeding roller 17 and a separation roller pair 18 that separates a plurality of sheets into one sheet in order along the medium conveyance direction.
The feed roller 17 is configured to be rotationally driven by a drive source (not shown). The separation roller pair 18 is also referred to as a retard roller, and includes a driving roller 18a that feeds paper toward the straight path 12 described later, and a driven roller 18b that nips and separates the paper between the driving roller 18a. Configured.

  A plurality of sheets can be stored in the sheet storage cassette 7, and the uppermost sheet is picked up by the feeding roller 17 and conveyed downstream in the conveying direction. At this time, the next and subsequent sheets may be conveyed together with the uppermost sheet, but the uppermost sheet and the next and subsequent sheets are separated by the separation roller pair 18 and only the uppermost sheet is fed. Sent to path 14.

On the downstream side of the separation roller pair 18 in the conveyance direction, a registration roller pair 19 provided on the upstream side of the belt conveyance means 20 described later is provided.
In this embodiment, the feeding path 14 and the straight path 12 are connected at the position of the registration roller pair 19.
The straight path 12 is configured as a path extending substantially linearly, and a belt conveyance unit 20, a charge removal unit 25, and a line head 10 are provided on the downstream side of the registration roller pair 19.
In the present embodiment, the belt conveying means 20 is disposed in a region facing the head surface of the line head 10 and supports the side opposite to the recording surface of the paper.

The line head 10 is configured to perform recording by ejecting ink as “liquid” onto the recording surface of the sheet when the sheet is conveyed to a position facing the line head 10 on the belt conveying unit 20. Yes. The line head 10 is a recording head provided such that nozzles that eject ink cover the entire width of the paper, and is configured as a recording head capable of recording over the entire medium width without moving in the medium width direction. ing.
Although the recording unit 2 of this embodiment includes the line head 10, a serial type recording head that is mounted on a carriage and performs recording by ejecting liquid onto the medium while reciprocating in a direction crossing the medium conveying direction. May be provided.

The sheet transported along the straight path 12 is subsequently sent to the first transport path 13. The first conveyance path 13 is a curved conveyance path connected to the straight path 12 on the downstream side of the line head 10, and the first discharge unit 8 has the recording surface of the sheet recorded by the line head 10 facing down. It is a route that sends it so that it is discharged from.
The sheet that has entered the first conveyance path 13 is conveyed by the conveyance roller pairs 21 and 22 and the conveyance roller pair group 23 and is discharged from the first discharge unit 8, and the medium placement unit 9 with the recording surface facing down. Placed on.

<<< Relay unit route >>>
Below, the relay unit path | route 32 (FIG. 2, FIG. 4) which is a conveyance path | route in the relay unit 3 is demonstrated.
In the relay unit 3 (FIG. 4), the relay unit path 32 includes an upstream transport path 81 and a downstream transport path 82.
The upstream transport path 81 is a path for transporting the paper introduced from the recording unit 2, and in the present embodiment, refers to a path upstream from a fifth transport roller pair group 61 described later. The downstream side conveyance path 82 is a path that is connected to the downstream side of the upstream side conveyance path 81 and conveys the sheet toward the post-processing unit 4.

  The paper on which recording is performed in the recording unit 2 is sent to the relay unit 3 from the delivery unit 28 (FIGS. 2 and 3) of the recording unit 2. Specifically, the recorded paper is sent to the recording unit path 31 (FIGS. 2 and 3), passes through the delivery unit 28, and from the upstream relay section 34 (FIG. 4) of the relay unit 3 to the upstream conveyance path 81. Enter (relay unit path 32).

Hereinafter, the relay unit path 32 will be described in more detail with reference to FIG. In addition, in each conveyance roller pair shown in FIG. 4, a driving roller driven by a driving source such as a motor is illustrated by a large circle, and a driven roller that is driven to rotate is illustrated by a small circle. Driving of the moving rollers of each pair of transport rollers is controlled by the control unit 27 (FIGS. 1 and 3), and the sheet is transported through the relay unit path 32 (upstream transport path 81 and downstream transport path 82).
The present invention is characterized in that the control unit 27 controls the sheet conveyance speed in the upstream conveyance path 81 and the downstream conveyance path 82. This will be described in detail after the configuration of the relay unit path 32 is described.

  The relay unit path 32 (FIG. 4) includes a branch point A, a branch point B, and a branch point C at which the transport path branches, a junction point D at which the transport path joins, and an end E that forms the end of the paper transport path. And an end F. Further, at the branch point A, the branch point B, and the branch point C, guide flaps (not shown) for distributing the sheet conveyance path are provided.

The first switchback path 52 and the second switchback path 55 are paths that perform a switchback operation that reverses the paper transport direction.
The first branch path 51 and the second branch path 54 are “branch paths” for sending the paper introduced from the recording unit 2 to either the first switchback path 52 or the second switchback path 55. . The first inversion path 53 is a path for inverting the sheet after the switchback in the first switchback path 52. The second reversing path 56 is a path for reversing the paper after the switchback in the second switchback path 55. The merge path 64 is a path where the first inversion path 53 and the second inversion path 56 merge. The merge path 64 is connected to the downstream transport path 82.

  In the present embodiment, the introduction path 50, the first branch path 51, the first switchback path 52, the first inversion path 53, the second branch path 54, the second switchback path 55, the second inversion path 56, and the merge path A path including 64 is an upstream conveyance path 81, and a path downstream of the merging path 64 is a downstream conveyance path 82.

  A first transport roller pair group 57 is provided on the introduction path 50, the first branch path 51, and the second branch path 54. In the first switchback path 52, a second transport roller pair group 58 is provided. In the second switchback path 55, a third transport roller pair group 59 is provided. A fourth transport roller pair group 60 is provided in the first reversing path 53, the second reversing path 56, and the merging path 64. The first transport roller pair group 57, the second transport roller pair group 58, the third transport roller pair group 59, and the fourth transport roller pair group 60 are upstream transport means provided in the upstream transport path 81. 84 (FIG. 4).

  The downstream conveyance path 82 is provided with a fifth conveyance roller pair group 61, a correction roller pair 62, and a discharge roller pair 63. The fifth transport roller pair group 61 is a downstream transport unit 85 (FIG. 4) provided in the downstream transport path 82.

The correction roller pair 62 is an example of a “correction transport unit” that transports the paper after performing the “skew correction operation” for the paper.
The correction roller pair 62 performs a “skew correction operation” that corrects the skew (skew) of the sheet in the transport direction in the relay unit path 32. In the “skew correction operation”, the control unit 27 decelerates the paper conveyance speed when the leading edge of the paper reaches the correction roller pair 62. In the present embodiment, by applying the paper to the correction roller pair 62 in the stopped state, the front end position of the paper in the transport direction is aligned, and the skew is corrected.

The paper whose skew has been corrected by the “skew correction operation” is nipped by the correction roller pair 62 and sent to the downstream relay unit 35.
The correction roller pair 62 is positioned on the downstream side in the conveyance direction with respect to the fifth conveyance roller pair group 61 and is arranged so that the leading edge of the sheet reaches the downstream relay unit 35 during conveyance by the correction roller pair 62. Has been. That is, the correction roller pair 62 is disposed near the downstream relay unit 35.

  The second conveyance roller pair group 58 and the third conveyance roller pair group 59 can rotate in the forward rotation direction or the reverse rotation direction, and the sheet conveyance direction in the first switchback path 52 and the second switchback path 55. Can be reversed.

The fifth transport roller pair group 61, the correction roller pair 62, and the discharge roller pair 63 provided in the downstream transport path 82 are rotationally driven by a common drive source 83. The fifth transport roller pair 61 is configured to be able to turn on / off the transmission of power from the drive source 83, and to turn off the transmission of power from the drive source 83 when the “skew correction operation” is performed. It is configured. As a result, during the “skew correction operation”, the fifth transport roller pair group 61 is decelerated. The power transmission of the drive source 83 can be switched on / off using, for example, an electromagnetic clutch (not shown).
Similarly to the fifth transport roller pair group 61, the correction roller pair 62 is also configured to be able to switch on / off the transmission of power from the drive source 83 by an electromagnetic clutch (not shown). In addition, the correction roller pair 62 includes an electromagnetic clutch (not shown) for applying a brake when the rotation is stopped in accordance with the execution of the “skew correction operation”.

  Next, the flow of paper conveyance in the relay unit path 32 will be described with reference to FIGS. 6 and 7 are diagrams corresponding to FIG. 4, and the transport system such as the first transport roller pair group 57 to the fifth transport roller pair group 61, the correction roller pair 62, the discharge roller pair 63, and the like. Illustration of components unnecessary for the description is omitted. Further, in FIGS. 6 and 7, a portion of the relay unit path 32 that is used for paper conveyance is indicated by a solid line, and a portion of the relay unit path 32 that is not used for paper conveyance is indicated by a broken line. In FIGS. 6 and 7, the arrows in the drawings indicate the conveyance direction of the paper, and are denoted by symbols H1 to H6, respectively.

The relay unit path 32 conveys the paper through two paths, a first path 32a (path indicated by a solid line in FIG. 6) shown in FIG. 6 and a second path 32b (path indicated by a solid line in FIG. 7) shown in FIG. be able to.
As shown by the solid line in FIG. 6, the first path 32 a through which the sheet is conveyed is the introduction path 50, the first branch path 51, the first switchback path 52, the first inversion path 53, and the merging path 64. And a downstream conveyance path 82.

  In the first path 32 a (FIG. 6), the sheet sent from the upstream relay unit 34 passes through the introduction path 50, travels along the first branch path 51 in the transport direction H <b> 1, and enters the first switchback path 52. . After the paper carried into the first switchback path 52 travels in the transport direction H2, the travel direction of the paper is reversed (switched back) and travels in the transport direction H3 opposite to the transport direction H2. Enter the first inversion path 53. Subsequently, the sheet travels in the conveyance direction H4 in the first reversing path 53 and enters the merging path 64, and further enters the downstream conveying path 82 from the merging path 64, and receives the receiving unit of the post-processing unit 4 from the downstream relay unit 35. It is carried out toward 41 (FIG. 1) (refer to the conveyance direction H5 and the conveyance direction H6).

On the other hand, the second path 32b indicated by a solid line in FIG. 7 includes an introduction path 50, a second branch path 54, a second switchback path 55, a second inversion path 56, a merging path 64, and a downstream transport path. 82.
In the second path 32 b, the paper carried from the upstream relay unit 34 passes through the introduction path 50, travels along the second branch path 54 in the transport direction H <b> 1, and is carried into the second switchback path 55. The sheet carried into the second switchback path 55 travels in the transport direction H2, then the travel direction of the sheet is reversed (switched back) and travels in the transport direction H3 opposite to the transport direction H2. It is carried into the reversing path 56. Subsequently, the paper advances in the conveyance direction H4 in the second reversing path 56, is carried into the merging path 64, further enters the downstream conveyance path 82 from the merging path 64, and receives the post-processing unit 4 from the downstream relay unit 35. It is carried out toward the portion 41 (FIG. 1) (see the transport direction H5 and the transport direction H6).

In the case where recording is continuously performed on a plurality of sheets, the sheet carried in from the upstream relay unit 34 is, for example, a preceding medium on which recording is performed first by a guide flap (not shown) provided at the branch point A. Guided to the first path 32a. Subsequently, the subsequent medium carried in from the upstream relay unit 34 is guided to the second path 32b by a guide flap (not shown) provided at the branch point A.
Then, the conveyance of the sheet along the first path 32a and the conveyance of the sheet along the second path 32b are alternately repeated.

In the above-described first transport path 13 (path for discharging the recorded paper from the first discharge unit 8), the control unit 27 does not perform a switchback operation for reversing the paper transport direction in the first transport path 13, The paper is discharged in the same transport direction.
On the other hand, when the sheet is discharged from the second discharge unit 40 through the relay unit 3, the switchback operation is performed in the first switchback path 52 or the second switchback path 55, so that the transport time is longer. Thus, the paper drying time can be made longer, and as a result, the post-processing by the post-processing unit 4 can be appropriately performed.

Further, since the relay unit path 32 includes two switchback paths (first switchback path 52 and second switchback path 55), two transport paths (first path 32a and second path 32b) are provided. Compared with the case of having one transport path, the sheet transport capability can be increased.
Further, as described above, when recording is continuously performed on a plurality of sheets, different transport paths can be used for the preceding medium and the succeeding medium. Accordingly, the interval between the preceding medium and the succeeding medium can be shortened, and the drying time can be ensured while suppressing a decrease in throughput.

  In the recording unit 2, when ink (water-based ink in the present embodiment) is ejected from the line head 10 onto the paper, moisture in the ink permeates the paper and is absorbed. In the relay unit 3, the moisture absorbed in the paper is evaporated and dried while the paper is transported through the relay unit path 32. The relay unit path 32 (the first path 32a and the second path 32b) has a long transport distance due to the first switchback path 52 and the second switchback path 55. Therefore, when the transport distance is short, for example, the recording unit 2 Compared with the case where the first transport path 13 is transported, the ink adhering to the paper can be dried more appropriately.

In the first switchback path 52 or the second switchback path 55, the position of the sheet surface (for example, the first surface) with respect to the transport direction is reversed before and after the sheet traveling direction is switched back.
For this reason, the sheet carried in from the upstream relay unit 34 is reversed on the front and back sides (the positions of the first surface and the second surface) in the transport direction while being transported through the first path 32a or the second path 32b. . Then, the paper is carried out from the downstream relay unit 35 toward the post-processing unit 4 (FIG. 1) in a state where the front and back sides with respect to the carrying direction are reversed.

<<< About the post-processing unit path >>>
The sheet carried out from the downstream relay unit 35 is carried into the post-processing unit path 33 from the receiving unit 41 of the post-processing unit 4 shown in FIG. The post-processing unit path 33 is a path for transporting paper derived from the downstream side transport path 82.
The post-processing unit 4 is provided on the downstream side of the sixth transport roller pair group 42 as the “post-processing path transport means” provided in the post-processing unit path 33, and downstream of the sixth transport roller pair group 42. An intermediate stacker 44 that temporarily stacks the previous sheets and a second discharge unit 40 as a “discharge unit” that discharges the post-processed sheets are provided.

The sheet that has entered the post-processing unit path 33 is sent by the sixth transport roller pair group 42, and the leading end side of the sheet temporarily reaches the second discharge unit 40. A guide flap 45 is provided in the vicinity of the upstream side of the second discharge unit 40, and the sheet is guided by the guide flap 45 and the sheet trailing edge side is set to the −Z-axis direction side to temporarily serve as the intermediate stacker 44. Stacked.
When the number of sheets (or one sheet) set for post-processing is stacked on the intermediate stacker 44, post-processing (cutting, stapling, etc.) is executed. The sheet or the sheet bundle after the post-processing is performed is discharged in the + Y-axis direction by the discharge roller 46 and placed on the discharge stacker 47.
The above is a series of flow of paper conveyance in the recording system 1.

■■■ Paper transport speed in the upstream transport path and downstream transport path ■■■
As described above, the present invention is characterized by the control of the sheet conveyance speed in the upstream conveyance path 81 and the downstream conveyance path 82 that constitute the relay unit path 32.
Specifically, the control unit 27, when the ink discharge amount M onto the paper by the line head 10 is equal to or greater than a predetermined threshold M1, is the upstream side conveyance unit 84 (first conveyance roller pair group 57 to fourth group. The transport speed by the transport roller pair group 60) is a first transport speed V1, and the transport speed by the downstream transport means 85 (fifth transport roller pair group 61) is a second transport speed V2 that is faster than the first transport speed V1. To do. When the amount of ink discharged onto the paper by the line head 10 is less than the predetermined threshold M1, the transport speed by the upstream transport means 84 is set to a third transport speed V3 that is faster than the first transport speed V1, and the downstream side The transport speed by the transport means 85 is set to a fourth transport speed V4 that is faster than the third transport speed V3. That is, control as shown in Table 1 below is performed.

Thereby, the following effects can be obtained.
That is, in the upstream conveyance path 81, the sheet is conveyed relatively later than the downstream conveyance path 82, so that the recording surface drying time can be secured in the upstream conveyance path 81.
The transport speed in the upstream transport path 81 means an “average transport speed” in the upstream transport path 81. The transport speed in the downstream transport path 82 means “average transport speed” in the downstream transport path 82. More specifically, in the present embodiment, the range of the upstream-side transport path 81 when defining the average transport speed is a path from an end E or end F, which will be described later, to a position S in FIG. Similarly, the range of the downstream conveyance path 82 when defining the average conveyance speed is defined as a path from the position S in FIG. 4 to the correction roller pair 62.
In order to perform the switchback operation in the upstream conveyance path 81 and to perform the skew feeding correction operation in the downstream conveyance path 82, the average conveyance speed in the upstream conveyance path 81 or the downstream conveyance path 82 is not necessarily upstream. In some cases, the transport speed at the certain timing of the side transport means 84 or the downstream transport means 85 does not match. The “average transport speed” means an average transport speed in the specific transport path range by eliminating such temporary fluctuations in the transport speed.

Further, when the ink ejection amount M onto the paper by the line head 10 is less than the predetermined threshold value M1, the transport speed by the upstream transport means 84 is set to the third transport speed V3 that is faster than the first transport speed V1. When the ink discharge amount is small and the recording surface is easy to dry, the upstream transfer path 81 can be transported at a relatively faster speed than when the ink discharge amount is large, thereby increasing the throughput.
That is, when the amount of ink discharged from the line head 10 is large, the recording surface is reliably dried by slowly transporting the upstream transport path 81 and the recording surface is dried, and the amount of ink discharged from the line head 10 is When the number is small, the throughput can be improved by quickly transporting the upstream transport path 81.

  Further, as described above, in the downstream-side transport unit 85, the “skew correction operation” by the correction roller pair 62 is executed. In the “skew correction operation”, the sheet is decelerated (stopped in the present embodiment) when the leading edge of the paper reaches the correction roller pair 62, and thus the paper (preceding medium) on which the “skew correction operation” is performed. And the following paper (following medium) are clogged (interval). Hereinafter, with reference to FIG. 8 and FIG. 9, an operation in which a plurality of sheets are continuously conveyed will be described.

  In each of FIGS. 8 and 9, the A3 sheet is shown being conveyed, and the sheet passing through the first path 32a (FIG. 6) using the first switchback path 52 is indicated by a solid line. A sheet passing through the second path 32b (FIG. 7) using the second switchback path 55 is indicated by a dotted line. The paper is conveyed in the order of paper P1, paper P2, paper P3, paper P4, paper P5, and paper P6.

  The right diagram of FIG. 8 shows a state immediately before the “skew correction operation” by the correction roller pair 62 is performed on the leading sheet P1. At this time, a predetermined interval L1 is secured between the respective sheets. Note that the right diagram in FIG. 8 shows a distance L1 between the rear end of the paper P1 and the front end of the paper P2.

When the leading edge of the sheet P1 reaches the correction roller pair 62, a “skew correction operation” is performed. At this time, since the paper P1 hits the correction roller pair 62 in the stopped state, its conveyance is stopped or decelerated for a moment.
Even during the “skew correction operation”, the succeeding paper P2 to paper P4 are transported by the upstream-side transport means 84. Therefore, as shown in the middle diagram of FIG. move on. As a result, the distance between the trailing edge of the leading sheet P1 and the leading edge of the succeeding sheet P2 is clogged by the distance L2, and there is a possibility of collision when the sheet is sent to the post-processing unit 4, for example.
In order to avoid the collision, it is conceivable to sufficiently increase the interval L1 between the respective sheets. However, if the interval L1 is increased, the throughput of the apparatus decreases.

  However, in the present embodiment, the transport speed (second transport speed or fourth transport speed) of the downstream transport means 85 is the transport speed (first transport speed or third transport speed) of the upstream transport means 84. Therefore, the sheet P1 (preceding medium) and the sheet P2 associated with the “skew correction operation” are resumed by restarting the transport by the downstream transport unit 85 after the “skew correction operation”. The clogging of the (following medium) interval can be widened. That is, in the left diagram of FIG. 8, the interval L3 between the paper P1 and the paper P2 is larger than the interval L1. Thereby, the possibility of collision of the subsequent medium with the preceding medium can be reduced. Accordingly, it is possible to appropriately correct skew feeding and suppress a reduction in throughput.

  FIG. 9 shows the state after execution of the “skew correction operation” for the paper P2 from the state immediately before the “skew correction operation” for the paper P2 (right diagram in FIG. 9) following the paper P1 (in FIG. 9). FIG. 9 shows a state (left diagram in FIG. 9) in which the transport by the downstream transport means 85 is resumed after the “skew correction operation”.

The control unit 27 is transported by the fifth transport roller pair group 61 (downstream transport unit 85) and has a leading medium (for example, the sheet P1 in the left diagram of FIG. 8) with the leading end reaching the correction roller pair 62. The fifth transport roller pair group 61 so as to maintain a predetermined distance between the rear end and the leading end of the subsequent medium transported by the fourth transport roller pair group 60 (upstream transport means 84). And the 4th conveyance roller pair group 60 is controlled.
Thereby, it is possible to avoid a collision between the preceding medium and the succeeding medium when the “skew correction operation” is performed, and to suppress the occurrence of a conveyance failure.

The combination of the transport speed of the upstream transport means 84 and the transport speed of the downstream transport means 85 controlled by the control unit 27 can be configured to be changed in a plurality of combinations.
For example, as shown in Table 2, three or more combinations can be set as a combination pattern of the transport speed of the upstream transport unit 84 and the transport speed of the downstream transport unit 85.

If the relationship among the first conveyance speed V1, the second conveyance speed V2, the third conveyance speed V3, and the fourth conveyance speed V4 in Table 1 is established between the combination 1 and the combination 2, or the combination 2 and the combination 3, Good. In Table 2, as shown in the relationship between the combination 1 and the combination 2, the transport speed W2 (corresponding to the second transport speed V2) and the transport speed W4 (corresponding to the fourth transport speed V4) are constant (W2 = W4). It can also be.
The transport speed by the upstream transport means 84 may be set to another transport speed (W3 or W1) based on the transport speed W5, for example. For example, when the transport speed W5 is used as a reference, the transport speed W3 is a half of the transport speed W5, and the transport speed W1 is a quarter of the transport speed W5 (a speed of 1/2 of the transport speed W3). Can be set to be

  By having a plurality of combination patterns of the conveyance speed of the upstream conveyance means 84 and the conveyance speed of the downstream conveyance means 85, for example, a plurality of threshold values for the ink discharge amount M can be set (for example, in addition to the threshold value M1) , A threshold M2 is set).

  In the present embodiment, the sheet introduction speed from the recording unit 2 to the upstream conveyance path 81 is determined by the conveyance by the upstream conveyance unit 84 (the first conveyance roller pair group 57 to the fourth conveyance roller pair group 60). Speed and constant speed. That is, if the average transport speed in the upstream transport path 81 is the first transport speed V1, the introduction speed from the recording unit 2 to the upstream transport path 81 is also set to the first transport speed V1, and the average transport in the upstream transport path 81 is performed. If the speed is the third transport speed V3, the introduction speed from the recording unit 2 to the upstream transport path 81 is also set to the third transport speed V3.

  In addition, the sheet delivery speed from the downstream transport path 82 to the post-processing unit 4 is equal to the transport speed by the downstream transport unit 85 (fifth transport roller pair group 61). That is, when the average transport speed in the downstream transport path 82 is the second transport speed V2, the introduction speed from the downstream transport path 82 to the post-processing unit 4 is also set to the second transport speed V2, and the downstream transport path 82 is set. When the average transport speed at is the fourth transport speed V4, the introduction speed from the downstream transport path 82 to the post-processing unit 4 is also set to the fourth transport speed V4.

  Accordingly, it is possible to smoothly transfer the paper from the recording unit 2 to the relay unit 3 or to transfer the paper from the relay unit 3 to the post-processing unit 4.

Furthermore, it is preferable that the transport speed of the sixth transport roller pair group 42 provided in the post-processing unit path 33 is equal to that of the fifth transport roller pair group 61 provided in the downstream transport path 82.
When the paper before post-processing conveyed through the post-processing unit path 33 is conveyed to the intermediate stacker 44 at the same speed as the conveyance speed in the downstream-side conveyance path 82 (second conveyance speed or fourth conveyance speed). The paper can be stacked on the intermediate stacker 44 with a more reliable interval between the preceding medium and the succeeding medium, and post-processing can be appropriately performed.

The ink discharge amount M, which is referred to when the control unit 27 controls the upstream-side transport unit 84 and the downstream-side transport unit 85, is the average discharge amount in a print job with one post-processing or the print job. Is the discharge amount for the medium having the largest discharge amount.
“Recording job with one post-processing” means, for example, recording on a plurality of sheets, stacking a predetermined number of sheets on the intermediate stacker 44, and binding the stacked sheets by stapling. Let's say a series of jobs.
Based on the average discharge amount in the recording job or the discharge amount for the sheet having the largest discharge amount in the recording job, the control unit 27 performs the first transport roller pair group 57 to the fourth transport roller pair group 60 ( By determining the transport speeds of the upstream transport unit) and the fifth transport roller pair group 61 (downstream transport unit), it is possible to dry the paper appropriately and to effectively suppress a decrease in throughput in the recording system 1.

  In addition, the control unit 27 determines whether the upstream side conveying unit 84 performs post-processing in the recording job, that is, whether to perform stapling processing, cutting processing, or just to sort each predetermined number of sheets. It is also possible to change the transport speed of the downstream transport means 85.

  In this embodiment, the recording system 1 is configured by combining the individual recording unit 2, the relay unit 3, and the post-processing unit 4. However, the recording unit 2, the relay unit 3, and the post-processing are used. A recording system in which the unit 4 is integrally formed may be used.

■■■ Other configurations of the relay unit ■■■
Below, with reference to FIGS. 10-13, the other structure in the relay unit 3 is demonstrated.
The relay unit 3 (FIG. 2) is provided with drying means 90a and 90b in order to efficiently dry the paper conveyed through the relay unit path 32. Examples of the drying means 90a and 90b include a blower fan and a heater.
In the present embodiment, the drying means 90a and 90b are blower fans and are provided to send wind toward the second switchback path 55 (FIGS. 10 and 11).

  The second switchback path 55 includes an inner path surface 91 positioned inside the curve of the second switchback path 55 and an outer path surface 92 positioned outside the curve of the second switchback path 55, and is dried. The means 90 a is arranged so as to send wind toward the inner path surface 91, and the drying means 90 b is arranged so as to send wind toward the outer path surface 92.

  Each of the outer path surface 92 and the inner path surface 91 is provided with a plurality of slit portions 93. The slit portion 93 has an elongated shape in the transport direction (Y-axis direction). By providing the slit portion 93 on the outer path surface 92 and the inner path surface 91, the effect of drying the paper by the wind sent from the drying means 90a and the drying means 90b is enhanced.

  As shown in FIG. 4, the second switchback path 55 includes a curved portion 94 (FIGS. 10 and 11) that temporarily curves in the direction from the branch point C to the second switchback path 55, and an end F. And a straight portion 95 extending linearly toward the head. The inner path surface 91 is provided only in the central portion of the linear portion 95 in the width direction (X-axis direction) that intersects the paper transport direction.

As shown in FIG. 12, in the vicinity of the center in the width direction of the second switchback path 55, the paper P is sandwiched by both the outer path surface 92 and the inner path surface 91 from the curved portion 94 to the straight portion 95. It is configured. With this configuration, it is possible to realize the stable conveyance of the sheet in the second switchback path 55 by pressing the sheet from the curved portion 94 to the linear portion 95.
On the other hand, as shown in FIG. 13, at the end in the width direction, the sheet P is sandwiched by both the outer path surface 92 and the inner path surface 91 in the curved portion 94, but in the straight portion 95, the outer path surface The sheet is supported only by 92. With this configuration, it is possible to easily perform processing such as a paper jam in the second switchback path 55.
In FIG. 12 and FIG. 13, reference numeral 96 denotes a knurled roller having a plurality of protrusions around it and configured to make point contact with the paper.

■■■ Other configurations of the recording unit ■■■
<<< Conveyance path for duplex recording >>>
As described above, the recording unit 2 is configured to be able to perform double-sided recording, and is downstream of the line head 10 and upstream of the first transport path 13 (in this embodiment, the pair of transport rollers in FIG. 3). 21) (upstream side of 21) is connected to a double-sided recording switchback path 15 and a double-sided recording switchback path 15 branched from the straight path 12, and reverses the front and back sides (first side and second side) of the sheet. And an inversion path 16 for returning to 12. Guide flaps 36 and 37 (FIG. 3) are provided at the connecting portion between the straight path 12 and the double-sided recording switchback path 15 and at the connecting part between the double-sided recording switchback path 15 and the reverse path 16, respectively. The path through which the sheet is sent is switched by these switching operations. The operation of the guide flaps 36 and 37 is also controlled by the control unit 27. Further, the control unit 27 also controls the conveyance timing performed by driving the belt conveyance means 20 and various conveyance roller pairs.

When performing double-sided recording with the line head 10, the control unit 27 performs recording on the second side by inverting the paper on which recording has been performed on the first side after waiting for a predetermined waiting time.
Specifically, recording is performed on the first surface (the top diagram in FIG. 5), and the recorded paper (indicated by reference symbol P in FIG. 5) is sent from the straight path 12 to the double-sided recording switchback path 15. (Second diagram from the top in FIG. 5).
In the double-sided recording switchback path 15, the paper P waits for a predetermined waiting time in order to dry the recording on the first side.

The sheet P (second figure from the top in FIG. 5) waiting for a predetermined waiting time in the double-sided recording switchback path 15 is sent to the double-sided recording switchback path 15 by the transport roller pair 24 (FIG. 3). Is sent in the direction opposite to the direction (+ Y-axis direction) (-Y-axis direction) and enters the reversing path 16, the recording surface is reversed, enters the straight path 12 again, and is recorded on the second surface by the line head 10. Is performed (second diagram from the bottom in FIG. 5). In FIG. 3, reference numeral 29 denotes a transport roller pair provided in the reversing path 16.
The sheet P on which recording has been performed on both sides enters the first transport path 13 as an example of the transport destination from the straight path 12, is discharged from the first discharge section 8, and is mounted on the medium stacking section 9 (FIG. 3). (The bottom diagram in FIG. 5). When post-processing is performed in the post-processing unit 4, the paper P on which both sides have been recorded is sent from the straight path 12 to the recording unit path 31.

<<< Manual Feeding >>>
The recording unit 2 (FIG. 3) is configured to be able to feed paper from the manual feed tray 70 in addition to recording by feeding paper stored in the paper storage cassette 7. In FIG. 3, a dotted line R indicates a conveyance path when paper is fed from the manual feed tray 70.
The paper fed from the manual feed tray 70 is fed by the pair of transport rollers 71, joins the straight path 12, and is recorded by the line head 10. In the case of performing double-sided recording, after recording on the first side, the recording is reversed through the double-sided recording switchback path 15 and the reverse path 16 to perform recording on the second side.
The recorded sheet is conveyed through a third conveyance path 74 that is continuous with the straight path 12 and extends linearly, and is placed on a sheet discharge tray 73 through a third discharge unit 72.

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

DESCRIPTION OF SYMBOLS 1 ... Recording system, 2 ... Recording unit, 3 ... Relay unit, 4 ... Post-processing unit,
5 ... Printer section, 6 ... Scanner section, 7 ... Paper storage cassette, 8 ... First discharge section,
9: Medium placement unit, 10 ... Line head, 12 ... Straight path,
13 ... 1st conveyance path | route, 14 ... Feeding path | route, 15 ... Switchback path | route for double-sided recording,
16 ... reversing path, 17 ... feeding roller, 18 ... pair of separation rollers,
19 ... Registration roller pair, 20 ... Belt conveying means, 21 ... Conveying roller pair,
22 ... Conveying roller pair, 23 ... Conveying roller pair group, 24 ... Conveying roller pair,
25 ... Static elimination part, 26 ... Switching part, 27 ... Control part, 28 ... Delivery part, 29 ... Conveyance roller pair,
31 ... Recording unit path, 32 ... Relay unit path, 33 ... Post-processing unit path,
34 ... Upstream relay section, 35 ... Downstream relay section, 36, 37 ... Guide flaps,
40 ... 2nd discharge part, 41 ... acceptance part, 42 ... 6th conveyance roller pair group,
44 ... intermediate stacker, 45 ... guide flap, 46 ... discharge roller,
47 ... discharge stacker, 50 ... introduction route, 51 ... first branch route,
52 ... first switchback path, 53 ... first inversion path, 54 ... second branch path,
55 ... second switchback path, 56 ... second inversion path,
57 ... 1st conveyance roller pair group, 58 ... 2nd conveyance roller pair group,
59 ... third transport roller pair group, 60 ... fourth transport roller pair group,
61: Fifth transport roller pair group, 62: Correction roller pair, 63: Discharge roller pair,
64 ... Merging path, 70 ... Bypass tray, 71 ... Conveying roller pair,
72, a third discharge unit, 73, a discharge tray, 74, a third transport path,
81: upstream transport path, 82: downstream transport path, 83: drive source,
84: upstream conveying means, 85 ... downstream conveying means,
90a, 90b ... drying means, 91 ... inner path surface, 92 ... outer path surface,
93 ... Slit part, 94 ... Bent part, 95 ... Straight part, 96 ... Giza roller

Claims (10)

A recording unit including a recording unit that performs recording by discharging a liquid onto a medium;
A post-processing unit that performs post-processing on the medium on which recording has been performed in the recording unit;
A relay unit that is disposed between the recording unit and the post-processing unit and conveys the medium from the recording unit to the post-processing unit;
A control unit for controlling the transport operation of the medium,
The relay unit is
An upstream transport path for transporting the medium introduced from the recording unit;
Upstream transport means provided in the upstream transport path;
A downstream conveyance path that is connected to the downstream side of the upstream conveyance path and conveys the medium toward the post-processing unit;
Downstream transport means provided in the downstream transport path;
A correction conveyance unit that is provided on the downstream side of the downstream conveyance unit in the downstream conveyance path, and conveys the medium after performing a skew correction operation on the medium;
The skew correction operation includes an operation in which a tip of the medium is abutted against the correction transport unit,
The control unit sets the transport speed by the upstream transport means as a first transport speed, and sets the transport speed by the downstream transport means as a second transport speed that is faster than the first transport speed.
A recording system characterized by that. The recording system according to claim 1,
The controller is
When the discharge amount of the liquid onto the medium by the recording unit is equal to or greater than a predetermined threshold, the transport speed by the upstream transport unit is set as the first transport speed, and the transport speed by the downstream transport unit is the first transport speed. The second transport speed is faster than the speed,
When the discharge amount of the liquid onto the medium by the recording unit is less than a predetermined threshold, the transport speed by the upstream transport means is set to a third transport speed that is faster than the first transport speed, and the downstream transport means The transport speed according to is a fourth transport speed that is faster than the third transport speed,
A recording system characterized by that. The recording system according to claim 1 or 2,
The control unit executes skew correction control for reducing the conveyance speed of the medium when the leading edge of the medium reaches the correction conveyance unit.
A recording system characterized by that. In the recording system according to any one of claims 1 to 3,
The introduction speed of the medium from the recording unit to the upstream conveyance path is equal to the conveyance speed by the upstream conveyance means,
The speed at which the medium is led out from the downstream transport path to the post-processing unit is equal to the transport speed by the downstream transport unit.
A recording system characterized by that. In the recording system according to any one of claims 1 to 4,
The control unit is provided between the rear end of the preceding medium that is transported by the downstream transport unit and the leading end reaches the correction transport unit, and the front end of the subsequent medium transported by the upstream transport unit. Controlling the upstream conveying means and the downstream conveying means so as to maintain a predetermined interval;
A recording system characterized by that. In the recording system according to any one of claims 1 to 5,
The liquid discharge amount, which is referred to when the control unit controls the upstream transport unit and the downstream transport unit, is the average discharge amount in a print job with one post-processing or the most in the print job. A discharge amount for a medium having a large discharge amount.
A recording system characterized by that. In the recording system according to any one of claims 1 to 6,
The upstream transport path is
A first switchback path and a second switchback path, which are paths for performing a switchback operation for reversing the conveyance direction of the medium;
A branch path for sending the medium introduced from the recording unit to either the first switchback path or the second switchback path;
A first inversion path for inverting the medium after switchback in the first switchback path;
A second inversion path for inverting the medium after switchback in the second switchback path;
A merge path where the first inversion path and the second inversion path merge,
The merging path is connected to the downstream conveying path;
A recording system characterized by that. In the recording system according to any one of claims 1 to 7,
The post-processing unit is
A post-processing unit path for transporting the medium derived from the downstream-side transport path;
Post-processing path conveying means provided in the post-processing unit path;
An intermediate stacker that is provided on the downstream side of the post-processing path conveying means and temporarily stacks the medium before post-processing;
A discharge unit for discharging the medium after post-processing,
The control unit controls the transport speed of the post-processing path transport unit to be equal to the downstream transport unit;
A recording system characterized by that. An upstream transport path for transporting the medium introduced from the recording unit that performs recording by discharging liquid from the recording unit to the medium;
Upstream transport means provided in the upstream transport path;
A downstream conveyance path that is connected to the downstream side of the upstream conveyance path and conveys the medium toward a post-processing unit that performs post-processing on the medium on which recording has been performed in the recording unit;
Downstream transport means provided in the downstream transport path;
A correction conveyance unit that is provided on the downstream side of the downstream conveyance unit in the downstream conveyance path, and conveys the medium after performing a skew correction operation on the medium;
The skew correction operation includes an operation in which a tip of the medium is abutted against the correction transport unit,
The control unit that controls the transport operation of the medium sets the transport speed by the upstream transport unit as a first transport speed, and sets the transport speed by the downstream transport unit as a second transport speed that is faster than the first transport speed. ,
A relay unit characterized by that. The relay unit according to claim 9,
The controller is
When the discharge amount of the liquid onto the medium by the recording unit is equal to or greater than a predetermined threshold, the transport speed by the upstream transport unit is set as the first transport speed, and the transport speed by the downstream transport unit is the first transport speed. The second transport speed is faster than the speed,
When the discharge amount of the liquid onto the medium by the recording unit is less than a predetermined threshold, the transport speed by the upstream transport means is set to a third transport speed that is faster than the first transport speed, and the downstream transport means The transport speed according to is a fourth transport speed that is faster than the third transport speed,
A relay unit characterized by that.

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