JP2018016491A - Intermediate unit, post-processing device, and printing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress adverse effect of skew of a medium.SOLUTION: A printing device feeds a medium of which skew is properly corrected to a post-processing unit from an intermediate unit so as to suppress adverse effect of skew of the medium in the post-processing unit.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an intermediate unit, a post-processing apparatus equipped with the intermediate unit, and a printing apparatus equipped with the post-processing apparatus.

2. Description of the Related Art Conventionally, a printing system including a multifunction peripheral (image forming apparatus) that prints an image on a sheet that is an example of a medium, and a post-processing apparatus that performs post-processing such as punching processing and stapling on a sheet on which an image is printed. (Printing apparatus) is known (Patent Document 1).
A printing system (printing apparatus) described in Patent Literature 1 includes a multifunction peripheral (image forming apparatus) that prints an image on a sheet, a post-processing apparatus that performs post-processing on a sheet on which an image is printed, and a multifunction peripheral. And a relay unit (intermediate unit) that constitutes a conveyance path to the post-processing apparatus. The post-processing apparatus has an alignment member, and post-processing is performed in a state where the sheets are aligned by the alignment member.

Japanese Patent Laying-Open No. 2015-107840

  However, in the image forming apparatus and the intermediate unit, for example, the skew in which the sheet is conveyed obliquely with respect to the conveyance direction is likely to occur due to various causes such as the eccentricity of the rotation shaft of the roller that conveys the sheet and the curl of the sheet. In the printing apparatus described in Patent Document 1, when the skew of the paper carried from the intermediate unit to the post-processing apparatus is extremely large, it is difficult to properly align by the alignment member, and punching processing, stapling processing, etc. There was a risk that it would be difficult to properly perform the post-treatment.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  [Application Example 1] The intermediate unit according to this application example is configured such that the medium is supplied to a carry-in port through which the medium is carried from a printing unit that discharges liquid and prints an image on the medium, and a post-processing unit that performs post-processing on the medium An intermediate unit having a carry-out port for unloading the medium and a conveyance path disposed between the carry-in port and the carry-out port, and a drive for applying a force in the conveyance direction to the medium on the conveyance path A first transport roller pair group provided with a plurality of transport roller pairs having a roller and a driven roller that nips and rotates the medium between the drive roller and the first transport roller pair group A correction roller pair that is located downstream in the transport direction and corrects the skew of the medium with respect to the transport direction.

  For example, when the liquid is water-based ink and an image is printed on the medium by the water-based ink, the medium absorbs water of the water-based ink and swells. Further, the swelling state of the medium is different between the portion where a large amount of water-based ink is ejected and a dark image is formed, and the portion where a little water-based ink is ejected and a light image is formed. Easy to curl. Furthermore, the curled state varies depending on the difference in the swollen state, and the medium curled into various shapes is carried from the printing unit to the intermediate unit and conveyed along the conveyance path of the intermediate unit.

  When the curled medium is transported to the transport path of the intermediate unit, it becomes difficult for the transport roller pair to uniformly nip the medium and uniformly apply a force in the transport direction to the medium. However, even if the skew of the medium occurs in the transport path by the correction roller pair, the medium is unloaded from the carry-out port while the skew of the medium in the transport direction is corrected (corrected). can do.

  Application Example 2 In the intermediate unit according to the application example described above, when the correction roller pair conveys the smallest size medium that can be conveyed, the correction roller pair nips and conveys the minimum size medium. It is desirable that the tip of the medium of the minimum size is arranged to reach the carry-out port.

  The correction roller pair is arranged so that the front end of the medium reaches the carry-out port while the medium is nipped by the correction roller pair and conveyed. In other words, the correction roller pair is arranged near the carry-out port. Since the correction roller pair for correcting the skew of the medium is arranged near the carry-out port, the skew of the medium with respect to the transport direction is corrected (corrected) even when the skew of the medium occurs in the transport path. In this state, the medium can be carried out from the carry-out port.

  Application Example 3 In the intermediate unit according to the application example, the correction roller pair includes the first roller that rotates and drives the medium in the direction of transporting the medium toward the carry-out port, and the first roller. It is preferable that the first roller has a surface provided with a convex portion capable of making point contact with the medium.

  Since the first roller makes point contact with the medium, the contact area with the medium becomes narrower than when the first roller makes surface contact with the medium, and the dirt on the medium is hardly transferred to the first roller. Furthermore, when the medium is nipped and conveyed by the first roller and the second roller, the convex portion is arranged so as to bite into the medium, and the first roller becomes difficult to slide against the medium, so that the medium is stably conveyed. Can be made.

  Application Example 4 In the intermediate unit according to the application example described above, the first transport roller pair group includes a plurality of first transport roller pairs driven by the same motor, and is in the transport direction with respect to the correction roller pair. An upstream first transport roller pair disposed on the upstream side, disposed upstream of the correction roller pair in the transport direction, and disposed downstream of the upstream first transport roller pair in the transport direction. A downstream first transport roller pair, and when correcting the skew, the downstream first transport after releasing the transport force applied to the medium by the upstream first transport roller pair It is preferable to release the conveying force applied to the medium by the roller pair.

  When correcting the skew of the medium, the force in the conveyance direction applied to the medium from the first downstream conveyance roller pair is canceled first, and the conveyance direction applied to the medium from the first upstream conveyance roller pair is temporarily canceled. When the force is released later, the medium is bent between the pair of downstream first conveyance rollers and the pair of upstream first conveyance rollers, and conveyance defects such as a jam of the medium easily occur.

  Therefore, when correcting the skew of the medium, the force in the transport direction applied to the medium from the upstream first transport roller pair is first released, and the transport direction applied to the medium from the downstream first transport roller pair Is released later, the medium is unlikely to bend between the downstream first transport roller pair and the upstream first transport roller pair, and transport defects such as a jam of the medium are less likely to occur.

  Application Example 5 In the intermediate unit according to the application example described above, the second transport roller pair is disposed on the upstream side in the transport direction with respect to the first transport roller pair group, and a plurality of transport roller pairs driven by the same motor are disposed. A pair of transport rollers, and a first transport roller pair disposed in the uppermost stream in the first transport roller pair group and a second transport roller pair disposed in the most downstream in the second transport roller pair group. It is preferable that the distance between them is longer than the distance between the first transport roller pair disposed on the most downstream side in the first transport roller pair group and the correction roller pair.

With the drive of the correction roller pair stopped, the first transport roller pair group is driven, and the end of the medium is pushed into the nip position of the correction roller pair, so that the medium (hereinafter referred to as the first medium) Skew is corrected. That is, the skew of the first medium is corrected in a state where the conveyance of the first medium is stopped.
The second transport roller pair group transports the next medium (hereinafter referred to as the second medium), and when the skew of the first medium is corrected, the second medium is turned into the first transport roller pair group. The feeding and correction of the skew of the second medium by the correction roller pair is executed.

When the distance between the first transport roller pair group and the second transport roller pair group is set to be short, the second transport roller pair group is driven when correcting the skew of the first medium. Since there is a possibility that this medium interferes with the first medium, it is also necessary to stop the conveyance of the second medium by the second conveyance roller pair group.
When the distance between the first transport roller pair group and the second transport roller pair group is set to be long, the second transport roller pair group is driven even when the second transport roller pair group is driven when correcting skew of the first medium. This makes it difficult for the medium to interfere with the first medium, and it is no longer necessary to continue transporting the second medium by the second transport roller pair group and stop transporting the second medium by the second transport roller pair group. Therefore, when correcting the skew of the first medium, it is not necessary to stop the conveyance of the second medium by the second conveyance roller pair group, so the conveyance of the second medium by the second conveyance roller pair group is stopped. Compared with the case where it does, the conveyance capability in a conveyance path | route can be improved.
Therefore, the distance between the first transport roller pair group and the second transport roller pair group is preferably longer than the distance between the first transport roller pair group and the correction roller pair.

  Application Example 6 A post-treatment device according to this application example is arranged on the downstream side in the transport direction with respect to the intermediate unit described in the application example and the intermediate unit, and is carried out from the carry-out port. And a post-processing unit having a mounting unit for mounting a medium and a post-processing unit for performing post-processing on the medium mounted on the mounting unit.

  Even when the skew of the medium occurs in the transport path of the intermediate unit, there is a correction roller pair that corrects the skew of the medium near the carry-out port, so that the skew is corrected. The medium is placed on the placement unit, and the post-processing unit can appropriately post-process the medium.

  Application Example 7 A post-processing apparatus according to this application example transports the medium carried in from a printing unit that discharges liquid and prints an image on the medium in the transport direction, and applies a force in the transport direction to the medium. A conveying roller pair group provided with a plurality of conveying roller pairs each having a driving roller that nips the medium between the driving roller and a driven roller that is driven to rotate, and a placement unit that places the medium. A post-processing unit that performs post-processing on the medium placed on the mounting unit, and the medium is skewed with respect to the transport direction between the pair of transport rollers and the mounting unit. A correction roller pair to be corrected is provided.

  In the case where the skew of the medium occurs, the post-processing apparatus is provided with a correction roller pair for correcting the skew of the medium between the transport roller pair group and the mounting portion. The medium is placed on the placement unit, and the post-processing unit can appropriately post-process the medium.

  Application Example 8 The post-processing apparatus according to the application example further includes a placement unit side transport roller pair between the transport roller pair group and the mounting unit, and the correction roller pair is transportable. When conveying a medium having a minimum size, the tip of the medium having the minimum size is arranged so as to reach the pair of conveying rollers on the placement unit, while the medium having the minimum size is nipped and conveyed by the correction roller pair. It is preferred that

The correction roller pair is arranged so that the front end of the medium reaches the loading unit side conveyance roller pair while the medium is nipped and conveyed by the correction roller pair. In other words, the correction roller pair is disposed in the vicinity of the placement unit side conveyance roller pair. Even when the skew of the medium occurs, the correction roller pair is arranged near the loading unit side conveyance roller pair, so the correction roller pair is arranged far from the loading unit side conveyance roller pair. The medium whose skew has been corrected more appropriately is transported to the placement part side transport roller pair and placed on the placement part.
Since the medium is placed on the placement unit in a state where skewing is corrected more appropriately, the post-processing unit can perform post-processing on the medium more appropriately.

  Application Example 9 A printing apparatus according to this application example is disposed on the upstream side in the transport direction with respect to the post-processing apparatus described in the application example and the post-processing apparatus, and discharges the liquid to the medium. And a printing unit for printing an image.

A correction roller that corrects the skew of the medium in the vicinity of the carry-out port even when an image is formed on the medium under conditions where the swelling is likely to occur in the printing unit, and the skew of the medium is likely to occur due to the swelling in the intermediate unit. Since the pair is provided, the medium is placed on the placement unit in a state where the skew is corrected, and the post-processing unit can appropriately perform the post-processing.
Therefore, in the printing apparatus (post-processing apparatus), the adverse effect of the skew of the medium is suppressed, and the post-processing can be appropriately performed on the medium.

  Application Example 10 A printing apparatus according to this application example includes a printing unit that discharges liquid and prints an image on a medium, a driving roller that applies a force in a conveyance direction to the medium sent from the printing unit, and A transport roller pair group including a plurality of transport roller pairs each having a driven roller that nips the medium with a driving roller and is driven to rotate, a mounting unit that mounts the medium, and a mounting unit that is mounted on the mounting unit. A post-processing unit that performs post-processing on the placed medium, and a correction roller pair that corrects skew of the medium in the transport direction is disposed between the transport roller pair group and the mounting unit. It is provided.

  In the case where the skew of the medium occurs, the printing apparatus is provided with a correction roller pair for correcting the skew of the medium between the transport roller pair group and the mounting portion. The medium is placed on the placement unit, and the post-processing unit can appropriately post-process the medium.

1 is a schematic diagram illustrating an overview of a printing apparatus according to an embodiment. Schematic which shows the outline | summary of a printing unit. Schematic which shows the state of the conveyance system of an intermediate unit. Schematic which shows the outline | summary of a drive roller. The elements on larger scale of a drive roller. The partial schematic which shows the outline | summary of a driven roller. The elements on larger scale of the area | region R of FIG. Schematic which shows the outline | summary of a correction roller pair. FIG. 3 is a schematic diagram illustrating a sheet conveyance path. FIG. 6 is a schematic diagram illustrating another sheet conveyance path. Schematic which shows the state before performing correction of skew of a paper. Process flow showing how to correct skew of paper. Schematic which shows the state of the process shown in FIG. Schematic which shows the state of the process shown in FIG. Schematic which shows the state of the process shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. Such an embodiment shows one aspect of the present invention and does not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. In each of the following drawings, the scale of each layer or each part is made different from the actual scale so that each layer or each part can be recognized on the drawing.

(Embodiment)
"Printer Overview"
FIG. 1 is a schematic diagram illustrating an overview of a printing apparatus according to an embodiment. First, an overview of the printing apparatus 1000 according to the present embodiment will be described with reference to FIG.

As illustrated in FIG. 1, the printing apparatus 1000 ejects ink that is an example of “liquid” and prints an image on a sheet M that is an example of “medium”. And a post-processing apparatus 500 disposed on the downstream side in the transport direction. The post-processing apparatus 500 is disposed upstream in the conveyance direction of the paper M, dries the ink ejected on the paper M, and corrects (corrects) the skew that is conveyed obliquely with respect to the conveyance direction. The intermediate unit 200 that sends out the paper M and the downstream of the paper M in the transport direction of the paper M are stacked. The paper M carried out from the intermediate unit 200 is stacked, and various post-processing such as stapling processing and punching processing are performed on the paper M. It is comprised with the post-processing unit 300 which performs a process.
That is, the printing apparatus 1000 is disposed on the upstream side in the transport direction of the paper M with respect to the post-processing apparatus 500 including the intermediate unit 200 and the post-processing unit 300, and ejects ink. And a printing unit 100 for printing an image.

  The printing unit 100 includes a rectangular parallelepiped casing 101, an operation unit 102 disposed in the upper part of the casing 101 in the vertical direction Z, and a paper cassette 103 provided from the center to the lower part of the printing unit 100. have. Four paper cassettes 103 are arranged side by side in the vertical direction Z, and the paper M is stored in a stacked state in each of them. A grip portion 103 a that can be gripped by the user is provided at the center in the left-right direction X of the paper cassette 103. A rectangular front plate cover 104 is provided at a position adjacent to the uppermost sheet cassette 103.

  The intermediate unit 200 is attached to the left side surface of the printing unit 100 in the horizontal direction X that is the arrangement direction. The intermediate unit 200 has a casing 291 that is short in the vertical direction Z on the printing unit 100 side and long on the post-processing unit 300 side. The housing 291 is provided with a carry-in port 292 through which the paper M printed by the printing unit 100 is carried in, and a carry-out port 293 through which the paper M is carried out to the post-processing unit 300.

  The intermediate unit 200 has a conveyance path 201 for conveying the paper M, which is indicated by a one-dot chain line in the drawing. The conveyance path 201 is disposed between the carry-in entrance 292 and the carry-out exit 293. In the conveyance path 201, a fifth conveyance roller pair group 250, a fourth conveyance roller pair group 240 and a third conveyance roller pair group 230, a second conveyance roller pair group 220, a first conveyance roller pair group 210, The correction roller pair 260 and the discharge roller pair 270 are arranged in order along the conveyance direction of the paper M. The paper M carried in from the carry-in entrance 292 includes a fifth transport roller pair group 250, a fourth transport roller pair group 240 or a third transport roller pair group 230, a second transport roller pair group 220, and a first transport roller. The pair group 210, the correction roller pair 260, and the discharge roller pair 270 are transported in the transport direction, and are transported from the transport outlet 293 to the post-processing unit 300.

  The first transport roller pair group 210 is disposed on the upstream side of the correction roller pair 260 in the transport direction of the paper M, and includes a plurality of first transport roller pairs 10 that are driven by the same motor (not shown). . The second transport roller pair group 220 is arranged upstream of the first transport roller pair group 210 in the transport direction of the paper M, and includes a plurality of second transport roller pairs 20 driven by the same motor (not shown). Have. The third transport roller pair group 230 is arranged upstream of the second transport roller pair group 220 in the transport direction of the paper M, and includes a plurality of third transport roller pairs 30 driven by the same motor (not shown). Have. The fourth transport roller pair group 240 is arranged upstream of the second transport roller pair group 220 in the transport direction of the paper M, and includes a plurality of fourth transport roller pairs 40 driven by the same motor (not shown). Have. The fifth transport roller pair group 250 is disposed upstream of the third transport roller pair group 230 and the fourth transport roller pair group 240 in the transport direction of the paper M, and is driven by the same motor (not shown). The fifth conveying roller pair 50 is provided.

The correction roller pair 260 is disposed near the carry-out port 293 and downstream of the first conveyance roller pair group 210 in the conveyance direction of the sheet M, and the sheet M is conveyed obliquely with respect to the conveyance direction. Correct the skew.
Furthermore, the distance L2 between the first transport roller pair group 210 and the second transport roller pair group 220 is longer than the distance L1 between the first transport roller pair group 210 and the correction roller pair 260.

The post-processing unit 300 is attached to the left side surface of the intermediate unit 200 in the left-right direction X that is the arrangement direction, and has a rectangular parallelepiped casing 301. Furthermore, the post-processing unit 300 includes a post-processing transport roller pair group 327, a guide unit 330, a stacker 328, a discharge unit, which are sequentially arranged along the transport direction of the paper M indicated by a one-dot chain line in the drawing. A paper roller pair 329 and a paper discharge tray 331 are provided.
The post-processing transport roller pair group 327 includes a first post-processing transport roller pair 327A disposed near the carry-out port 293 and a second post-processing transport roller pair 327B disposed near the paper discharge roller pair 329. It consists of. That is, the first post-processing transport roller pair 327A and the second post-processing transport roller pair 327B are sequentially arranged in the direction from the carry-out port 293 toward the paper discharge roller pair 329.
The post-processing first transport roller pair 327A is an example of a “mounting unit side transport roller pair”.

The paper M carried out from the intermediate unit 200 is conveyed to the stacker 328 via the paper discharge roller pair 329 and the guide unit 330.
The stacker 328 is for temporarily placing the paper M to be processed by the post-processing unit 325, and is an example of a “mounting unit”. The stacker 328 is disposed obliquely so as to incline downward toward the post-processing unit 325. Thus, one end side of the paper M placed on the stacker 328 comes into contact with the wall surface 328b of the stacker 328, and the one end side of the paper M is aligned. When the number of sheets M placed on the stacker 328 reaches a predetermined number, the post-processing unit 325 performs various types of post-processing such as stapling and punching on the sheets M. Subsequently, the paper discharge roller pair 329 is driven, and the post-processed paper M is discharged to the paper discharge tray 331.
As described above, in the post-processing unit 300, the paper M carried out from the intermediate unit 200 is sequentially transported to the stacker 328 by the paper discharge roller pair 329 and the guide unit 330, and a predetermined number of papers M are placed on the stacker 328. Then, post-processing is performed by the post-processing unit 325, and the paper is discharged onto the paper discharge tray 331 by driving the paper discharge roller pair 329.

"Print Unit Overview"
FIG. 2 is a schematic diagram showing an outline of the printing unit.
Next, the outline of the printing unit 100 will be described with reference to FIG.
As shown in FIG. 2, in the casing 101 of the printing unit 100, a printing unit 110 that performs printing from the upper side in the vertical direction Z on the paper M, and a transport unit that transports the paper M along the transport path 120. 130 is provided. The transport path 120 is formed so that the paper M is transported with the direction intersecting the width direction as the transport direction when the direction along the front-rear direction Y is the width direction of the paper M.

  The printing unit 110 includes a line head type print head 111 that can simultaneously eject ink over substantially the entire width direction of the paper M at the bottom. In the printing unit 110, the ink ejected from the print head 111 is attached (landed) on the printing surface (the surface on which the image is printed) of the paper M facing the print head 111, thereby forming an image on the paper M. The

  The conveyance unit 130 includes a plurality of conveyance roller pairs 131 arranged along the conveyance path 120 and a belt conveyance unit 132 provided immediately below the printing unit 110. That is, ink is ejected from the print head 111 to the paper M being conveyed by the belt conveyance unit 132, and printing is performed.

The ink is a water-based ink in which a coloring material is dispersed (or dissolved) in an aqueous medium.
The coloring material is, for example, a dye, and a direct dye, an acid dye, a food dye, a basic dye, a reactive dye, a disperse dye, a vat dye, a soluble vat dye, a reactive disperse dye, or the like can be used.

  Examples of the coloring material include pigments, azo pigments such as insoluble azo pigments, condensed azo pigments, azo lakes, chelate azo pigments, phthalocyanine pigments, perylene and perinone pigments, anthraquinone pigments, quinacridone pigments, dioxane pigments, thioindigo pigments, and isoindolinone pigments. Polycyclic pigments such as quinophthalone pigments, dye chelates, dye lakes, nitro pigments, nitroso pigments, aniline black, daylight fluorescent pigments, carbon black, base metal pigments and the like can be used.

The solvent is, for example, an aqueous medium, and pure water or ultrapure water such as ion exchange water, ultrafiltration water, reverse osmosis water, and distilled water can be used. In addition, when water sterilized by ultraviolet irradiation or addition of hydrogen peroxide is used, generation of mold and bacteria can be prevented when the ink is stored for a long time.
The solvent may contain a volatile water-soluble organic solvent such as ethylene glycol or propylene glycol.

  Furthermore, in addition to the above-mentioned color materials and solvents, the inks are basic catalysts, surfactants, tertiary amines, resins, pH adjusters, buffers, fixing agents, preservatives, antioxidants and UV absorbers. An agent, a chelating agent, an oxygen absorber, etc. may be included.

  The belt transport unit 132 includes a drive roller 133 disposed on the upstream side in the transport direction from the print head 111, a driven roller 134 disposed on the downstream side in the transport direction from the print head 111, and each of these rollers 133, And an endless belt 135 hung on 134. When the driving roller 133 is driven and rotated, the belt 135 circulates, and the paper M is conveyed to the downstream side by the circulating belt 135. That is, the outer surface of the belt 135 functions as a support surface that supports the paper M on which printing is performed.

  The transport path 120 includes a supply path 140 through which the paper M is transported toward the printing unit 110, a discharge path 150 through which printing is performed by the printing unit 110 and the printed paper M is transported, and a discharge path 150. And a branching path 160 branching from.

  The supply path 140 includes a first supply path 141, a second supply path 142, and a third supply path 143. In the first supply path 141, the paper M inserted from the insertion port 141 b exposed by opening the cover 141 a provided on the right side surface of the housing 101 is conveyed to the printing unit 110. That is, the paper M inserted from the insertion port 141b is conveyed linearly toward the printing unit 110 by the rotational drive of the first drive roller pair 144.

  In the second supply path 142, in the vertical direction Z, the sheets M respectively stored in the sheet cassette 103 provided at the lower portion of the casing 101 are conveyed to the printing unit 110. That is, the sheets M stored in the sheet cassette 103 in a stacked state are reversed in posture in the vertical direction Z after the uppermost sheet M is fed out by the pickup roller 142a and separated one by one by the separation roller pair 145. However, it is conveyed toward the printing unit 110 by the rotational drive of the second drive roller pair 146.

  In the third supply path 143, when performing double-sided printing that prints images on both sides of the paper M, the paper M on which one side has been printed by the printing unit 110 is conveyed again to the printing unit 110. That is, a branch path 160 that branches from the discharge path 150 is provided downstream of the printing unit 110 in the transport direction. That is, when performing duplex printing, the sheet M is conveyed to the branch path 160 by the operation of the branch mechanism 147 provided in the middle of the discharge path 150. Further, the branch path 160 is provided with a branch path roller pair 161 capable of both normal rotation and reverse rotation on the downstream side of the branch mechanism 147.

  At the time of duplex printing, the paper M on which one side is printed is once guided to the branch path 160 by the branch mechanism 147 and conveyed downstream in the branch path 160 by the branch path roller pair 161 rotating in the forward direction. Thereafter, the sheet M conveyed to the branch path 160 is reversely conveyed from the downstream side to the upstream side in the branch path 160 by the branch path roller pair 161 that rotates in the reverse direction. That is, the conveyance direction of the sheet M conveyed on the branch path 160 is reversed.

  The sheet M reversely conveyed from the branch path 160 is conveyed to the third supply path 143 and is conveyed toward the printing unit 110 by the plurality of conveyance roller pairs 131. By being transported through the third supply path 143, the sheet M is reversed so that the other side not printed faces the printing unit 110, and is transported toward the printing unit 110 by the rotational drive of the third drive roller pair 148. Is done. That is, the third supply path 143 functions as a reverse conveyance path for conveying the paper M while reversing the posture of the paper M in the vertical direction Z.

  Among the supply paths 141, 142, and 143, the second supply path 142 and the third supply path 143 convey the paper M toward the printing unit 110 while the posture of the paper M is curved in the vertical direction Z. On the other hand, compared to the second supply path 142 and the third supply path 143, the first supply path 141 transports the sheet M toward the printing unit 110 without significantly curving the posture of the sheet M. .

  The printing unit 110 performs printing on one side or both sides, and the printed paper M is transported along a discharge path 150 that forms a downstream part of the transport path 120 by the transport roller pair 131. The discharge path 150 is branched into a first discharge path 151, a second discharge path 152, and a third discharge path 153 at a position downstream of the position branched from the branch path 160. That is, the sheet M on which printing has been completed is transported through a common discharge path (upstream discharge path) 154 that constitutes an upstream portion of the discharge path 150, and then a guide mechanism (switching) provided at the downstream end of the common discharge path 154. The guide part) 180 guides to any one of the first to third discharge paths (downstream discharge paths) 151, 152, and 153 constituting the downstream part of the discharge path 150.

  The first discharge path (upper discharge path) 151 is provided so as to extend upward of the housing 101 and bend and extend along the branch path 160. The sheet M conveyed through the first discharge path 151 is discharged from a discharge port 155 that opens at a part of the housing 101 so as to be the end of the first discharge path 151. The paper M discharged from the discharge port 155 falls downward in the vertical direction Z, and is discharged onto the mounting table 156 in a stacked state as indicated by a two-dot chain line in FIG. Note that the paper M is discharged from the discharge port 155 to the mounting table 156 in a posture in which the printing surface at the time of single-sided printing faces downward in the vertical direction Z by the conveyance roller pairs 131 arranged at a plurality of locations in the discharge path 150. The

  The mounting table 156 has an upwardly inclined shape that rises upward in the vertical direction Z as it goes to the right in the left-right direction X, and the sheets M are mounted on the mounting table 156 in a stacked state. At this time, each sheet M placed on the placement table 156 moves to the left along the inclination of the placement table 156 and approaches the vertical side wall 157 provided below the discharge port 155 of the housing 101. Placed.

  The first discharge path 151 has a discharge reversal path 151 a that reverses the front and back of the paper M while the paper M printed by the printing unit 110 is conveyed to the discharge port 155. That is, the discharge reversing path 151a is curved with the printing surface of the paper M printed by the printing unit 110 facing inward, and the printing surface of the paper M is in the vertical direction Z from the state where the printing surface of the paper M faces upward in the vertical direction Z. The paper M is reversed so that it faces downward. Accordingly, in the discharge path 150, the paper M passes through the discharge reversal path 151a and is discharged from the discharge port 155 in a state where the printing surface at the time of single-sided printing faces the mounting table 156.

  The second discharge path 152 branches below the first discharge path 151 in the vertical direction Z, and linearly extends from the printing unit 110 toward the drawing surface part 106 that forms a part of the housing 101. Therefore, the sheet M transported through the second discharge path 152 is not transported in a curved posture as in the first discharge path 151, and the posture remains constant as when passing through the printing unit 110. The sheet is conveyed linearly and discharged from a discharge port 108 formed in the drawing surface portion 106 to a discharge tray 109 attached to the drawing surface portion 106. That is, the second discharge path 152 functions as a non-reverse discharge path for transporting the paper M toward the paper discharge tray 109 without reversing the posture of the paper M in the vertical direction.

  The third discharge path (downward discharge path) 153 branches downward in the vertical direction Z from the second discharge path 152 and extends obliquely downward in the vertical direction Z so as to go downward of the housing 101. Yes. The downstream end is connected to the carry-in port 292 of the intermediate unit 200. That is, the sheet M conveyed through the third discharge path 153 is carried into the intermediate unit 200 from the carry-in entrance 292.

"Outline of intermediate unit"
FIG. 3 is a diagram corresponding to the schematic diagram of the intermediate unit shown in FIG. 1, and is a schematic diagram showing the state of the transport system of the intermediate unit. FIG. 4 is a schematic view showing an outline of the drive roller. FIG. 5 is a partially enlarged view of the drive roller. FIG. 6 is a partial schematic view showing an outline of the driven roller. FIG. 7 is a partially enlarged view of a region R surrounded by a one-dot chain line in FIG. FIG. 8 is a schematic view showing an outline of the correction roller pair.
In FIGS. 3 to 8, illustration of components unnecessary for description is omitted. In FIG. 3, the driving rollers 10a, 20a, 30a, 40a, 50a, 260a, and 270a driven by the motor are illustrated in large circles, and the driven rollers 10b, 20b, 30b, 40b, 50b, and 260b that are driven to rotate are illustrated. 270b is illustrated by a small circle.
Next, an outline of the intermediate unit 200 will be described with reference to FIGS.

  As shown in FIG. 3, the conveyance path 201 includes a branch point A, a branch point B, and a branch point C where the conveyance path of the paper M branches, a merging point D where the conveyance path of the paper M merges, and a conveyance of the paper M. It has an end E and an end F that form the ends of the path. Further, at the branch point A, the branch point B, and the branch point C, guide flaps (not shown) for distributing the transport path of the paper M are provided.

  Further, the transport path 201 includes an introduction path 202, a first branch path 203, a first switchback path 204, a first merge path 205, a second branch path 206, a second switchback path 207, 2 merging path 208 and derivation path 209.

  A conveyance path 201 between the carry-in entrance 292 and the branch point A is an introduction path 202. A conveyance path 201 between the branch point A and the branch point B is a first branch path 203. A conveyance path 201 between the branch point B and the end E is a first switchback path 204. A conveyance path 201 between the branch point B and the junction point D is a first junction path 205. A conveyance path 201 between the branch point A and the branch point C is a second branch path 206. A conveyance path 201 between the branch point C and the end F is a second switchback path 207. A conveyance path 201 between the branch point C and the junction point D is a second junction path 208. A conveyance path 201 between the junction D and the carry-out port 293 is a derivation path 209.

  The introduction path 202, the first branch path 203, and the second branch path 206 are provided with a fifth transport roller pair group 250, and the transport of the paper M is controlled by the fifth transport roller pair group 250. The first switchback path 204 is provided with a third transport roller pair group 230, and the transport of the paper M is controlled by the third transport roller pair group 230. The second switchback path 207 is provided with a fourth transport roller pair group 240, and the transport of the paper M is controlled by the fourth transport roller pair group 240. A second conveyance roller pair group 220 is provided on the upstream side in the conveyance direction of the sheet M in the first merge path 205, the second merge path 208, and the lead-out path 209, and the second conveyance roller pair group 220 forms a sheet. The conveyance of M is controlled. A first transport roller pair group 210, a correction roller pair 260, and a discharge roller pair 270 are provided on the downstream side in the transport direction of the paper M in the lead-out path 209, and the first transport roller pair group 210, the correction roller pair 260, and the like. The conveyance of the sheet M is controlled by the discharge roller pair 270.

Although details will be described later, when the skew of the sheet M occurs in the transport direction in the transport path 201, the correction roller pair 260 corrects (corrects) the skew of the sheet M. Further, the sheet M whose skew has been corrected is nipped by the correction roller pair 260 and sent out (conveyed) to the carry-out port 293.
The correction roller pair 260 is located on the downstream side in the transport direction with respect to the first transport roller pair group 210, and the front end T of the paper M (see FIG. 11) while the paper M is nipped and transported by the correction roller pair 260. Is arranged so as to reach the carry-out port 293. Since the length of the paper M in the transport direction is extremely shorter than the length of the transport path 201, the leading edge T of the paper M reaches the carry-out port 293 while the paper M is nipped and transported by the correction roller pair 260. In addition, the state where the correction roller pair 260 is disposed corresponds to the state where the correction roller pair 260 is disposed near the carry-out port 293.
That is, the correction roller pair 260 is located on the downstream side in the transport direction with respect to the first transport roller pair group 210 and is disposed near the carry-out port 293.
In the present embodiment, when there are a plurality of types of sheets M having different lengths in the transport direction, the leading end T of the sheet M is unloaded by the correction roller pair 260 and the leading end T of the sheet M is unloaded at the exit 293. The correction roller pair 260 is arranged so as to reach That is, there are a plurality of types of paper M having different lengths in the transport direction, and even when the paper M has the shortest length in the transport direction, the leading edge T of the paper M is nipped by the correction roller pair 260 and being transported. The correction roller pair 260 is disposed so as to reach the carry-out port 293.

  The third transport roller pair group 230 and the fourth transport roller pair group 240 can rotate in the forward rotation direction or the reverse rotation direction, and reverse the transport direction of the paper M in the first switchback path 204 and the second switchback path 207. be able to.

The 1st conveyance roller pair 10 arrange | positioned at the 1st conveyance roller pair group 210 is comprised by the 1st drive roller 10a and the 1st driven roller 10b. The 2nd conveyance roller pair 20 arrange | positioned at the 2nd conveyance roller pair group 220 is comprised by the 2nd drive roller 20a and the 2nd driven roller 20b. The 3rd conveyance roller pair 30 arrange | positioned at the 3rd conveyance roller pair group 230 is comprised by the 3rd drive roller 30a and the 3rd driven roller 30b. The 4th conveyance roller pair 40 arrange | positioned at the 4th conveyance roller pair group 240 is comprised by the 4th drive roller 40a and the 4th driven roller 40b. The fifth transport roller pair 50 arranged in the fifth transport roller pair group 250 includes a fifth drive roller 50a and a fifth driven roller 50b.
The discharge roller pair 270 includes a drive roller 270a and a driven roller 270b.

The first driving roller 10a, the second driving roller 20a, the third driving roller 30a, the fourth driving roller 40a, the fifth driving roller 50a, and the driving roller 270a have the same configuration. For this reason, the first drive roller 10a will be described as a representative, and description of the drive rollers 20a, 30a, 40a, 50a, and 270a will be omitted.
The first driven roller 10b, the second driven roller 20b, the third driven roller 30b, the fourth driven roller 40b, the fifth driven roller 50b, and the driven roller 270b have the same configuration. For this reason, it demonstrates on behalf of the 1st driven roller 10b, and the description of driven roller 20b, 30b, 40b, 50b, 270b is abbreviate | omitted.
Furthermore, in the following description, the driving rollers 20a, 30a, 40a, and 50a may be collectively referred to as the driving roller 1, and the driven rollers 20b, 30b, 40b, and 50b may be collectively referred to as the driven roller 2.

  In the first transport roller pair 10, the first driving roller 10 a and the first driven roller 10 b nip (clamp) the paper M, and a motor that is a power source of the first driving roller 10 a is driven to drive the first driving. The roller 10a is rotationally driven, and a force for transporting the paper M in the transport direction is applied to the paper M. The first driven roller 10b nips the paper M with the first driving roller 10a and rotates in a driven manner.

  When an image is printed on one side of the paper M in the printing unit 100, the first driven roller 10b is in contact with the one side on which the image is formed, and the first driving roller 10a is on the side on which no image is formed. Touch. When images are printed on both sides of the sheet M in the printing unit 100, the first driven roller 10b comes into contact with the side on which the image is formed later, and the first drive roller 10a has the side on which the image has been previously formed. To touch.

In the following description, an image is formed after an image is printed on one side where the image is formed on one side of the paper M and an image is printed on both sides of the paper M. This surface is referred to as the surface of the paper M. When the image is printed on one side of the paper M, the side where the image is not formed and the side where the image is formed first when the image is printed on both sides of the paper M This is called the back side of M.
That is, the first driven roller 10 b is in contact with the front surface of the paper M, and the first drive roller 10 a is in contact with the back surface of the paper M.

  The first drive roller 10 a is longer than the assumed maximum width of the paper M and contacts the back surface of the paper M in the entire width direction of the paper M. As shown in FIGS. 4 and 5, the first drive roller 10 a has a cylindrical shape extending in one direction, and includes a drive shaft 11, a rubber roller portion 12 inserted through the drive shaft 11, and a rubber roller portion 12. The rough surface portion 13 is in contact with the back surface of the paper M. The rubber roller portion 12 is fixed to the drive shaft 11 and is provided so as to be rotatable integrally with the drive shaft 11. The rough surface portion 13 includes a binder layer 14 that covers the rubber roller portion 12 and ceramic particles 15 embedded so as to protrude from the surface of the binder layer 14.

  By providing the rough surface portion 13 on the outer peripheral surface in contact with the paper M of the first drive roller 10a, the ceramic particles 15 are arranged so as to bite into the back surface of the paper M. A force is applied, and the sheet M is stably conveyed. That is, when the ceramic particles 15 bite into the back surface of the paper M, the first driving roller 10a is less likely to slip with respect to the paper M, so that the force in the transport direction is stably applied to the paper M from the first driving roller 10a. The sheet M is stably conveyed.

  Furthermore, since the ceramic particles 15 are in point contact with the back surface of the paper M, the contact area of the first drive roller 10a with the paper M is narrowed. For example, double-sided printing is performed on the paper M, and undried ink is applied to the back surface of the paper M. When remaining, the undried ink is difficult to transfer to the first drive roller 10a, and the first drive roller 10a is less likely to become dirty.

The 1st driven roller 10b is divided | segmented into the some roll body (roll part 17). For this reason, the area of the portion of the first driven roller 10b that contacts the paper M is smaller than the area of the portion of the first drive roller 10a that contacts the paper M.
In FIG. 6, one of the plurality of roll bodies (roll unit 17) of the first driven roller 10b is illustrated. As shown in FIG. 6, the first driven roller 10 b includes a driven shaft 16 and a roll portion 17 inserted through the driven shaft 16. Specifically, the first driven roller 10 b includes a driven shaft 16 and a plurality of roll portions 17 inserted through the driven shaft 16. The roll portion 17 is fixed to the driven shaft 16 and is provided so as to be rotatable integrally with the driven shaft 16. The roll unit 17 has six toothed plates 82.

FIG. 7 is a partially enlarged view of the region R as seen from the direction along the driven shaft 16 (Y direction). The state of the teeth 77 provided on the peripheral surface of the roll portion 17 (six toothed plates 82) is shown in FIG. It is shown in the figure.
As shown in FIG. 7, when viewed from the Y direction, the positions of the teeth 77 are shifted so that the teeth 77 do not completely overlap each other on the peripheral surface of the roll portion 17 (six toothed plates 82). ing. That is, when viewed from the Y direction, the teeth 77 are arranged on the peripheral surface of the roll portion 17 so that all the teeth 77 are visible.
Specifically, when viewed from the Y direction, the intervals between the teeth 77 and the teeth 77 in the circumferential direction of the roll portion 17 are arranged at equal intervals. That is, the teeth 77 of the other five toothed plates 82 are arranged so that the teeth 77 of one toothed plate 82 and the pitch P of the teeth 77 are equally divided into six. In the present embodiment, the length of the pitch P between the teeth 77 and the teeth 77 is approximately 0.6 mm.
Then, the tips of the teeth 77 provided on the peripheral surface of the six-tooth plate 82 make point contact with the paper M. That is, the first driven roller 10 b (roll unit 17) includes teeth 77 that are pointed toward the outside of the surface, and the teeth 77 make point contact with the surface of the paper M.
The teeth 77 provided on the first driven roller 10b are an example of “a convex portion that can be point-contacted”. That is, the first driven roller 10 b has a surface on which convex portions (teeth 77) capable of point contact with the paper M are provided, and is in contact with the surface of the paper M.

  Further, in the toothed plate 82, when the tip of the tooth 77 is a peak portion 90, a groove-shaped valley portion 91 is provided between the peak portion 90 and the peak portion 90. In the present embodiment, the distance L3 from the valley portion 91 of the tooth 77 to the peak portion 90 in the radial direction of the roll portion 17 is approximately 0.41 mm. Further, the shape of the tooth 77 that makes point contact with the paper M is preferably a triangular shape having a tip angle of 45 degrees or more, and in this embodiment, the angle of the crest portion 90 is 60 degrees. ing.

  Thus, the teeth 77 have a sharp shape toward the outside of the surface, and the contact area with the paper M can be further narrowed compared to the ceramic particles 15. When double-sided printing is performed on the paper M, undried ink tends to remain on the front surface of the paper M as compared with the back surface of the paper M. Even when there is a lot of undried ink on the surface of the paper M, the first driven roller 10b has a smaller contact area with the paper M than the first drive roller 10a. The ink is less likely to be transferred to the first driven roller 10b, and the first driven roller 10b is less likely to become dirty.

  Furthermore, when the teeth 77 sharpened toward the outside of the surface bite into the surface of the sheet M, the first driven roller 10b becomes less slippery with respect to the sheet M, and the sheet M is moved between the first driving roller 10a. Nip and stable driven rotation.

As shown in FIG. 8, the correction roller pair 260 includes a driving roller 260a and a driven roller 260b. The drive roller 260a is driven to rotate by being driven by a motor that is a power source. The driven roller 260b nips the paper M with the driving roller 260a and rotates in a driven manner. In other words, the correction roller pair 260 includes a driving roller 260a that rotates in a direction in which the sheet M is conveyed toward the carry-out port 293, and a driven roller 260b that nips the sheet M between the driving roller 260a and rotates in a driven manner. doing.
The driving roller 260a is an example of a “first roller”, and the driven roller 260b is an example of a “second roller”.

  The driving roller 260 a is in contact with the front surface of the paper M, and the driven roller 260 b is in contact with the back surface of the paper M. That is, the driven rollers 20b, 30b, 40b, 50b, 270b and the driving roller 260a are in contact with the surface of the paper M, and the driving rollers 20a, 30a, 40a, 50a, 270a and the driven roller 260b are in contact with the back surface of the paper M.

  The driven roller 260b may be in contact with the front surface of the paper M, and the driving roller 260a may be in contact with the back surface of the paper M. That is, the driven rollers 20b, 30b, 40b, 50b, 270b and the driven roller 260b are in contact with the surface of the paper M, and the driving rollers 20a, 30a, 40a, 50a, 270a and the driving roller 260a are in contact with the back surface of the paper M. It may be.

The drive roller 260a includes a drive shaft 264 and a plurality of rollers 265 inserted through the drive shaft 264. The roller 265 is fixed to the drive shaft 264 and is provided so as to be rotatable integrally with the drive shaft 264. The roller 265 has the same configuration as the roll portion 17 (see FIG. 6) of the first driven roller 10 b in the first transport roller pair 10. That is, the surface of the roller 265 includes teeth 77 (see FIG. 7) pointed toward the outside of the surface, and the teeth 77 make point contact with the surface of the paper M.
Thus, the drive roller 260a has a surface on which the teeth 77 that can make point contact with the paper M are provided. Further, when viewed from the Y direction, the positions of the teeth 77 are shifted so that the teeth 77 do not completely overlap on the peripheral surface of the drive roller 260a (roll unit 17) (see FIG. 7).
The teeth 77 provided on the driving roller 260a are an example of “a convex portion that can be point-contacted”. In other words, the drive roller 260 a has a surface on which convex portions (teeth 77) that can make point contact with the paper M are provided.

  As a result, the teeth 77 provided on the surface of the drive roller 260a bite into the surface of the paper M, so that the drive roller 260a is less slippery with respect to the paper M, and stably applies a force in the transport direction to the paper M. And the sheet M can be stably conveyed. The drive roller 260a is less likely to become dirty by providing the teeth 77 on the surface thereof.

The driven roller 260 b includes a driven shaft 266 and a plurality of rollers 267 inserted through the driven shaft 266. The roller 267 is rotatably supported by the driven shaft 266 and is disposed so as to face the roller 265 of the driving roller 260a. Each of the plurality of rollers 267 has a smooth surface with no unevenness. Therefore, the paper M is more slippery with respect to the driven roller 260b than the driving roller 260a having the teeth 77 on the surface.
That is, the driven roller 260b has a smooth surface on which the paper M is slippery.

  Further, the driven roller 260b is made of a material that is excellent in wear resistance and slippery. For example, the driven roller 260b is made of polyacetal (acetal resin) and has self-lubricity and excellent slipperiness in addition to wear resistance. As a constituent material of the driven roller 260b, polyamide, polytetrafluoroethylene (fluororesin), polyphenylene sulfide, and the like can be used in addition to polyacetal.

The driven roller 260 b is in surface contact with the back surface of the paper M.
The paper M carried into the intermediate unit 200 includes a fifth transport roller pair group 250, a fourth transport roller pair group 240 and a third transport roller pair group 230, a second transport roller pair group 220, and a first transport roller. The correction roller pair 260 is reached via the pair group 210. Paper M via the fifth transport roller pair group 250, the fourth transport roller pair group 240 and the third transport roller pair group 230, the second transport roller pair group 220, and the first transport roller pair group 210 Since the ink adhering to the back surface of the paper M is gradually dried while the ink is conveyed, undried ink is unlikely to remain on the back surface of the paper M in contact with the driven roller 260b. Therefore, even if the driven roller 260b is in surface contact with the back surface of the paper M, the driven roller 260b is not easily contaminated with undried ink.

"Transfer route of intermediate unit"
FIG. 9 is a schematic diagram illustrating a sheet conveyance path. FIG. 10 is a schematic diagram illustrating another paper conveyance path.
9 and 10 are diagrams corresponding to FIG. 3, and the conveyance paths of the driving rollers 20 a, 30 a, 40 a, 50 a, 260 a, 270 a and the driven rollers 20 b, 30 b, 40 b, 50 b, 260 b, 270 b are illustrated. Illustration of components unnecessary for the description is omitted. Further, in FIGS. 9 and 10, a portion of the transport path 201 that is used for transporting the paper M is indicated by a solid line, and a portion of the transport path 201 that is not used for transport of the paper M is indicated by a broken line. In addition, the arrows in the figure indicate the transport direction of the paper M, and are denoted by symbols H1 to H6, respectively.

As shown by the solid line in FIG. 9, the first transport path 201a through which the paper M is transported includes an introduction path 202, a first branch path 203, a first switchback path 204, a first merge path 205, And a derivation path 209.
In the first transport path 201 a, the paper M carried in from the carry-in entrance 292 passes through the introduction path 202, travels in the transport direction H <b> 1 through the first branch path 203, and is carried into the first switchback path 204. The paper M carried into the first switchback path 204 travels in the transport direction H2, then the travel direction of the paper M is reversed (switched back) and travels in the transport direction H3 opposite to the transport direction H2. Then, it is carried into the first merge path 205. Further, the sheet M travels in the transport direction H4 in the first joining path 205, is carried into the lead-out path 209, travels in the transport direction H5 and the transport direction H6 in the lead-out path 209, and passes from the transport outlet 293 to the post-processing unit 300. It is carried out towards.

As shown by the solid line in FIG. 10, another transport path 201b (second transport path 201b) through which the sheet M is transported includes an introduction path 202, a second branch path 206, a second switchback path 207, The second joining path 208 and the derivation path 209 are configured.
In the second transport path 201b, the paper M carried in from the carry-in entrance 292 passes through the introduction path 202, travels along the second branch path 206 in the transport direction H1, and is carried into the second switchback path 207. The paper M carried into the second switchback path 207 travels in the transport direction H2, then the travel direction of the paper M is reversed (switched back), and travels in the transport direction H3 opposite to the transport direction H2. It is carried into the second merge path 208. Further, the sheet M travels in the transport direction H4 in the second merging path 208, is carried into the lead-out path 209, travels in the transport direction H5 and the transport direction H6 in the lead-out path 209, and passes from the transport outlet 293 to the post-processing unit 300. It is carried out towards.

The paper M carried in from the carry-in entrance 292 is guided to the first transport path 201a by the guide flap provided at the branch point A. Subsequently, the next sheet M carried in from the carry-in entrance 292 is guided to the second transport path 201b by the guide flap provided at the branch point A. Then, the conveyance of the paper M by the first conveyance path 201a and the conveyance of the paper M by the second conveyance path 201b are alternately repeated.
Since the intermediate unit 200 has two transport paths (a first transport path 201a and a second transport path 201b), the transport capability of the paper M is compared to the case where the intermediate unit 200 has one transport path. Can be increased.

  Since the transport paths 201a and 201b have the switchback paths 204 and 207, the transport paths 201a and 201b can be made longer than when the switchback paths 204 and 207 are not provided. That is, the intermediate unit 200 according to the present embodiment has a configuration that can increase the transport capability of the paper M and lengthen the transport paths 201a and 201b while saving space.

In the printing unit 100, ink (water-based ink) is ejected from the print head 111 onto the paper M, and when ink adheres to the paper M, moisture in the ink permeates the paper M, and the paper M absorbs moisture. In the intermediate unit 200, the paper M is transported along the transport paths 201a and 201b, thereby evaporating the moisture absorbed by the paper M and drying the ink adhering to the paper M. Since the transport paths 201a and 201b are long, the ink attached to the paper M can be dried more appropriately than when the transport paths 201a and 201b are short.
As described above, in the intermediate unit 200, the paper M is transported through the transport paths 201a and 201b that are elongated by the switchback paths 204 and 207, so that the ink attached to the paper M can be appropriately dried. In other words, the transport paths 201a and 201b form a drying path for evaporating the moisture absorbed by the paper M and drying the ink adhering to the paper M appropriately.

  When the transport direction (traveling direction) of the sheet M is switched back by the switchback paths 204 and 207 and the traveling direction of the sheet M is reversed, the position of the surface of the sheet M with respect to the transport direction is also reversed. That is, the position of the front surface of the sheet M with respect to the transport direction is reversed before and after the traveling direction of the sheet M is switched back by the switchback paths 204 and 207.

For this reason, the position of the surface of the sheet M carried in from the carry-in entrance 292 is reversed by the switchback paths 204 and 207 with respect to the carrying direction. Then, the sheet M is carried out from the carry-out port 293 toward the post-processing unit 300 in a state where the surface position with respect to the carrying direction is reversed.
As a result, the sheet M is carried in from the carry-in port 292 with the surface disposed on the upper side in the vertical direction Z, and is carried out from the carry-out port 293 with the surface disposed on the lower side in the vertical direction Z. That is, in the printing apparatus 1000, the sheet M is carried into the intermediate unit 200 from the printing unit 100 in a state where the surface is disposed on the upper side in the vertical direction Z, and the surface is disposed on the lower side in the vertical direction Z. The paper M is carried into the post-processing unit 300 from the intermediate unit 200.

  However, in the printing unit 100, when the water-based ink is discharged from the print head 111 onto the paper M and the paper M absorbs moisture, the paper M swells. Further, the printing duty on the paper M is not uniform, and the paper M has a portion where a dark image is formed and the printing duty is high (a portion where the ink discharge amount is large) and a portion where a light image is formed and the printing duty is low (the ink duty). A portion with a small discharge amount). In the portion where the printing duty is high, the sheet M absorbs a large amount of moisture, and thus the swelling of the sheet M increases. In the portion where the printing duty is low, the sheet M absorbs a small amount of moisture, and therefore the swelling of the sheet M is reduced.

For this reason, the paper M on which the image is printed includes a portion where the swelling is large and a portion where the swelling is small, and the paper M is curled (curved) due to the difference in the swelling state.
Therefore, in the intermediate unit 200, the paper M that has absorbed and curled moisture is transported through the transport paths 201a and 201b. Further, the curled state of the paper M changes depending on the image pattern to be printed, the composition of the ink (water content), and the like, so that the paper M curled in various states is transported through the transport paths 201a and 201b. become.

When the paper M is not curled, the end (hereinafter referred to as the front end T (refer to FIG. 11)) of the paper M arranged on the downstream side in the transport direction is uniform with respect to the driving roller 1 and the driven roller 2. The sheet M is less likely to be skewed with respect to the transport direction.
However, when the paper M is curled, it becomes difficult for the leading edge T of the paper M to be in uniform contact with the driving roller 1 and the driven roller 2, and skewing of the paper M with respect to the transport direction is likely to occur. Further, the skew state of the paper M varies depending on the curl state of the paper M, and the skew of the paper M may be slight or the skew of the paper M may be enormous.
Therefore, the sheet M slightly skewed with respect to the transport direction and the sheet M skewed with respect to the transport direction are carried into the post-processing unit 300 from the intermediate unit 200.

  When the skew of the paper M is enormous, the paper M is placed on the stacker 328 in a skewed state. Therefore, the post-processing unit 325 appropriately performs post-processing on the paper M placed on the stacker 328. There is a problem that it is difficult to apply.

For this reason, the intermediate unit 200 according to the present embodiment has a configuration for correcting the skew of the sheet M with respect to the transport direction near the carry-out port 293 for unloading the sheet M toward the post-processing unit 300. Since the intermediate unit 200 appropriately corrects the skew of the sheet M in the conveyance direction generated by conveying the conveyance paths 201a and 201b near the carry-out port 293, the sheet M is placed in the stacker 328 in the aligned state. The post-processing unit 325 placed thereon can appropriately post-process the paper M placed on the stacker 328.
The details will be described below.

“Correction of paper skew”
FIG. 11 is an enlarged view of a portion where the correction roller pair in FIG. 3 is arranged, and is a schematic diagram showing a state before correction of skew of the sheet. That is, FIG. 11 illustrates a state in which the sheet M1 is transported immediately before the correction roller pair 260 by the first transport roller pair group 210.
FIG. 12 is a process flow showing a method for correcting skew of paper. FIG. 13 is a partially enlarged view of FIG. 11 and is a schematic diagram showing a state of the process shown in FIG. 14 and 15 are diagrams corresponding to FIG. 13 and are schematic diagrams illustrating the state of the process illustrated in FIG. 12.
In FIG. 11, FIG. 13, FIG. 14, and FIG. 15, the driving rollers 10a, 20a, and 260a and the driven rollers 10b, 20b, and 260b are illustrated by circles of the same size for easy understanding of the state. ing.

  As shown in FIG. 11, with respect to the correction roller pair 260, on the upstream side in the transport direction H6 of the paper M, the first transport roller pair 10A, the first transport roller pair 10B, the first transport roller pair 10C, The first transport roller pair 10D, the second transport roller pair 20A, and the second transport roller pair 20B are sequentially arranged. The first transport roller pair 10A, the first transport roller pair 10B, the first transport roller pair 10C, and the first transport roller pair 10D constitute the first transport roller pair group 210, and the second transport roller pair 20A and the second transport. A part of the second transport roller pair group 220 is constituted by the roller pair 20B.

The sheet M1 is transported in the transport direction H6 by the first transport roller pair group 210, and the leading edge T of the sheet M1 is disposed immediately before the correction roller pair 260. Since the sheet M1 is conveyed obliquely with respect to the conveyance direction H6, the leading edge T of the sheet M1 intersects the direction orthogonal to the conveyance direction H6.
That is, when the sheet M1 is not skewed and the sheet M1 is conveyed along the conveyance direction H6, the leading edge T of the sheet M1 is orthogonal to the conveyance direction H6. When skew of the sheet M1 occurs and the sheet M1 is transported obliquely with respect to the transport direction H6, the leading edge T of the sheet M1 intersects in a direction orthogonal to the transport direction H6.

  The next sheet M2 is transported in the transport direction H6 by the second transport roller pair group 220. The leading edge T of the next sheet M2 is disposed so as to protrude from the second conveying roller pair 20A toward the first conveying roller pair group 210 side.

  As shown in FIG. 12, the method of correcting the skew of the sheet M includes the step of guiding the leading edge T of the sheet M to the nip position P1 of the correction roller pair 260 (step S1), and the skew of the sheet M at the nip position P1. And a step (step S3) of carrying out the sheet M, whose skew has been corrected, toward the carry-out port 293.

In step S1, the correction roller pair 260 (drive roller 260a) is stopped, the first transport roller pair group 210 (first drive roller 10a) is driven, and the transport direction from the first transport roller pair group 210 to the paper M1. The H6 force is being applied.
As shown in FIG. 13, the paper M is transported in the transport direction H <b> 6 by the first transport roller pair group 210, and first, the leading end T of the paper M <b> 1 contacts the position P <b> 2 of the driven roller 260 b of the correction roller pair 260. Since the driven roller 260b is made of a slippery material, the leading edge T of the paper M1 slides on the smooth surface of the driven roller 260b by the force in the transport direction H6 and is guided to the nip position P1 of the correction roller pair 260. The
That is, the driven roller 260b has a smooth surface, and when correcting the skew of the sheet M, the leading end T (end of the sheet M) of the sheet M is slid to nip the sheet M with the driving roller 260a. To the nip position P1.

  In step S2, when the leading edge T of the paper M is guided to the nip position P1 of the correction roller pair 260, the first transport roller pair 10D, the first transport roller pair 10C, the first transport roller pair 10B, and the first transport roller pair. In order of 10A, the connection of the motor to the first drive roller 10a is released, and the first drive roller 10a is changed to the idle state, and is applied to the paper M from the first transport roller pair 10A, 10B, 10C, 10D. The force in the transport direction H6 is released in order.

In the first transport roller pair 10A and the first transport roller pair 10B, the first transport roller pair 10A is an example of a “downstream first transport roller pair”, and the first transport roller pair 10B is “upstream first It is an example of a "conveying roller pair". In the first transport roller pair 10B and the first transport roller pair 10C, the first transport roller pair 10B is an example of the “downstream first transport roller pair”, and the first transport roller pair 10C is the “upstream first transport roller”. It is an example of a “pair”. In the first transport roller pair 10C and the first transport roller pair 10D, the first transport roller pair 10C is an example of the “downstream first transport roller pair”, and the first transport roller pair 10D is the “upstream first transport roller”. It is an example of a “pair”.
That is, when correcting the skew of the sheet M, the force in the transport direction H6 applied to the sheet M from the “upstream first transport roller pair” is first released, and the sheet is transported from the “downstream first transport roller pair”. The force in the transport direction H6 applied to M is later released.

  Since a force in the transport direction H6 is applied to the paper M1 from the first transport roller pair group 210, the paper M1 is transported to the correction roller pair 260 and the first transport as shown by the broken line in FIG. 13 and the solid line in FIG. Between the roller pair 10 </ b> A, the right side in the left-right direction X is bent, and the leading edge T of the sheet M <b> 1 is pushed into the nip position P <b> 1 of the correction roller pair 260.

Since the nip position P1 of the correction roller pair 260 is orthogonal to the transport direction H6, when the leading edge T of the sheet M1 is pushed into the nip position P1 of the correction roller pair 260, the leading edge T of the sheet M1 is aligned with the correction roller pair 260. It is arranged in a direction along the nip position P1, that is, a direction orthogonal to the transport direction H6.
As described above, in step S2, the leading end T of the sheet M1 intersects in a direction orthogonal to the transport direction H6 (the state in which the sheet M is skewed) to a state orthogonal to the transport direction H6 (the sheet). The state in which the skew of M is corrected).

As described above, when viewed from the Y direction, the positions of the teeth 77 are shifted so that the teeth 77 do not completely overlap on the circumferential surface of the drive roller 260a (see FIG. 7).
If viewed from the Y direction, if the teeth 77 are provided so as to overlap each other on the circumferential surface of the drive roller 260a, the leading edge T of the paper M that abuts the correction roller pair 260 causes the teeth 77 and the teeth 77 of the drive roller 260a to overlap. May not be guided to the nip position P1 of the correction roller pair 260, and the skew of the sheet M may not be corrected properly.
In the present embodiment, since the teeth 77 are provided so as not to overlap completely, the leading edge T of the paper M is unlikely to enter between the teeth 77 and the teeth 77 of the driving roller 260a, and the correction roller pair stably. It is guided to the nip position P1 of 260, and the skew of the sheet M can be corrected appropriately.

Temporarily, the first transport roller pair 10B, which is an example of the “downstream first transport roller pair”, is first disconnected from the motor, and the first transport roller pair, which is an example of the “upstream first transport roller pair”. When the connection between the motor 10C and the motor is later released, as shown in FIG. 15, the sheet M1 is placed between the first transport roller pair 10B and the first transport roller pair 10A in addition to the correction roller pair 260 and the first transport roller pair 10A. The first conveyance roller pair 10C is also bent, and a conveyance failure such as a jam of the paper M1 is likely to occur between the first conveyance roller pair 10B and the first conveyance roller pair 10C.
Therefore, when correcting the skew of the sheet M1, the first conveyance roller pair 10 disposed in the distance from the correction roller pair 260 is sequentially ordered in the conveyance direction H6 applied from the first conveyance roller pair 10 to the sheet M1. It is preferable to release the force in order. That is, when correcting the skew of the sheet M, the force in the transport direction H6 applied to the sheet M from the “upstream first transport roller pair” is first released, and the sheet is transported from the “downstream first transport roller pair”. A configuration in which the force in the transport direction H6 applied to M is released later is preferable.

In step S <b> 3, the driving roller 260 a is driven, the correction roller pair 260 is driven to rotate, and the sheet M whose skew has been corrected is carried out toward the carry-out port 293.
Subsequently, step S1 and step S2 are executed for the next sheet M2, and the skew of the next sheet M2 is corrected.

  Returning to FIG. 14, in step S <b> 2, the second transport roller pair group 220 maintains the driven state. In other words, while the correction roller pair 260 prevents the conveyance of the sheet M1 in the conveyance direction H6, the next sheet M2 is conveyed in the conveyance direction H6 by the second conveyance roller pair group 220.

The distance L2 between the first transport roller pair group 210 and the second transport roller pair group 220 is longer than the distance L1 between the first transport roller pair group 210 and the correction roller pair 260, and the transport direction of the paper M1 When the next sheet M2 is conveyed in the conveyance direction H6 while the conveyance to H6 is inhibited, it is set so that the next sheet M2 does not interfere with the sheet M1.
Accordingly, when the correction roller pair 260 inhibits the conveyance of the sheet M1 in the conveyance direction H6 in step S2, and the second conveyance roller pair group 220 conveys the next sheet M2 in the conveyance direction H6, the next sheet M2 is conveyed. Approaches the paper M1 and does not interfere with the paper M1.

Therefore, in step S2, since it is not necessary to stop the conveyance of the sheet M by the second conveyance roller pair group 220, compared with the case where the conveyance of the sheet M by the second conveyance roller pair group 220 is stopped, in the conveyance path 201. The conveyance ability of the paper M can be increased.
Therefore, it is preferable that the distance L2 between the first transport roller pair group 210 and the second transport roller pair group 220 is longer than the distance L1 between the correction roller pair 260 and the first transport roller pair group 210.

  As described above, the correction roller pair 260 is disposed near the carry-out port 293 so that the leading edge T of the paper M reaches the carry-out port 293 while the paper M is nipped by the correction roller pair 260 and conveyed. . As a result, the skew of the sheet M generated by transporting the transport paths 201 a and 201 b is corrected near the transport outlet 293 by the correction roller pair 260. Accordingly, the sheet M whose skew has been corrected is carried into the post-processing unit 300 from the carry-out port 293, and is placed on the stacker 328 in a state in which the sheets M are aligned in the post-processing unit 300. The post-processing can be appropriately performed on the paper M placed on the paper.

Further, the correction roller pair 260 is arranged such that the leading edge T of the paper M reaches the post-processing first transport roller pair 327A while the paper M is nipped and transported by the correction roller pair 260. In other words, when the sheet M whose skew has been corrected by the correction roller pair 260 is conveyed toward the stacker 328 (post-processing unit 325), both the correction roller pair 260 and the first post-processing conveyance roller pair 327A are used. The correction roller pair 260 is disposed at a distance that allows the sheet M to be nipped.
Specifically, there are a plurality of types of paper M having different lengths in the transport direction, and even for the paper M having the shortest length in the transport direction, both the correction roller pair 260 and the post-processing first transport roller pair 327A are used. The correction roller pair 260 is arranged at such a distance that M can be nipped. For example, the size of the paper M is A4 size, and the long side of the paper M is arranged in a direction intersecting the transport direction from the correction roller pair 260 toward the first post-processing transport roller pair 327A, and the short side of the paper M is When the paper M is transported in the state of being arranged along the transport direction from the correction roller pair 260 toward the post-processing first transport roller pair 327A (when the A4 size paper M is transported horizontally). Also, the correction roller pair 260 is disposed at such a distance that the paper M can be nipped by both the correction roller pair 260 and the post-processing first transport roller pair 327A. That is, the distance between the correction roller pair 260 and the post-processing first transport roller pair 327A is shorter than the length of the short side of the A4 size paper M.

  As a result, the sheet M whose skew has been corrected by the correction roller pair 260 is nipped by both the correction roller pair 260 on the intermediate unit 200 side and the first transport roller pair for post-processing 327A on the post-processing unit 300 side, and the sheet M M is transported toward the stacker 328 on the post-processing unit 300 side in a state where the skew is surely corrected. As a result, the skew-corrected sheet M is reliably carried into the stacker 328 on the post-processing unit 300 side, and the post-processing unit 325 on the post-processing unit 300 side is placed on the stacker 328. Thus, it is possible to reliably perform proper post-processing on the sheet M.

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit or idea of the invention that can be read from the claims and the entire specification. Various modifications other than the above-described embodiments are possible. Conceivable. Hereinafter, a modification will be described.

(Modification 1)
In the above embodiment, the intermediate unit 200 has the switchback paths 204 and 207, but is not limited thereto.
The intermediate unit 200 may not have the switchback paths 204 and 207. For example, the switchback paths 204 and 207 may not be provided in the intermediate unit 200, but the switchback paths 204 and 207 may be provided in the printing unit 100.
For example, the intermediate unit 200 carries out the paper M to the carry-in port 292 through which the paper M is carried from the printing unit 100 that discharges ink and prints an image on the paper M, and the post-processing unit 300 that performs post-processing on the paper M. It may be configured to include a carry-out port 293 and a carry route provided between the carry-in port 292 and the carry-out port 293 and provided with a drying route for drying the ink.

(Modification 2)
In the above embodiment, the post-processing device 500 includes the intermediate unit 200 and the post-processing unit 300. The intermediate unit 200 has the carry-out port 293 for carrying out the paper M to the post-processing unit 300. It is not limited to this.
For example, the post-processing apparatus 500 does not have the carry-out port 293, and a configuration in which the intermediate unit 200 and the post-processing unit 300 are integrated, for example, a pair of transport rollers that form the transport path 201 in the same housing. The group 210, 220, 230, 240, 250, the correction roller pair 260, the stacker 328, and the post-processing unit 325 may be arranged.

(Modification 3)
In the above embodiment, the printing apparatus 1000 includes the printing unit 100, the intermediate unit 200, and the post-processing unit 300, and the intermediate unit 200 includes a carry-in port 292 through which the paper M is carried from the printing unit 100, Although the processing unit 300 has the carry-out port 293 for carrying out the paper M, the present invention is not limited to this.
For example, the printing apparatus 1000 does not have the carry-in port 292 and the carry-out port 293, and the configuration in which the printing unit 100, the intermediate unit 200, and the post-processing unit 300 are integrated, for example, ink in the same casing. The printing unit 110 that prints an image on the discharged paper M, the conveyance roller pair group 210, 220, 230, 240, 250, the correction roller pair 260, the stacker 328, and the post-processing unit 325 are arranged. There may be.

(Modification 4)
In the above embodiment, the roller 265 of the driving roller 260a has the same configuration as the roll portion 17 (see FIG. 6) of the first driven roller 10b, but has the same configuration as the rubber roller portion 12 of the first driving roller 10a. May be. That is, the driving roller 260a may have a configuration in which the surface is roughened by the ceramic particles 15.
Even in the case where the driving roller 260a has a configuration in which the surface is roughened by the ceramic particles 15, the same effect as in the above embodiment in which the paper M is stably conveyed and undried ink is difficult to transfer. Can be obtained.

(Modification 5)
The ink that has been printed on both sides of the paper M and has adhered to the back surface of the paper M is dried downstream in the transport direction in the transport path 201, and undried ink is unlikely to remain on the back surface side of the paper M. For this reason, even if the driving roller 1 is in surface contact with the back surface of the paper M on the downstream side in the transport direction in the transport path 201, it is difficult to be contaminated by undried ink.

  Therefore, the drive roller 1 may have a configuration that allows surface contact with the back surface of the paper M on the downstream side in the transport direction in the transport path 201. That is, the drive roller 1 may be configured by the drive shaft 11 and the rubber roller portion 12 inserted through the drive shaft 11, and the rough surface portion 13 covering the rubber roller portion 12 may be deleted.

For example, the first drive roller 10a and the second drive roller 20a are configured by the drive shaft 11 and the rubber roller portion 12 inserted through the drive shaft 11, and the rough surface portion 13 covering the rubber roller portion 12 is deleted. There may be.
For example, the first drive roller 10a of the first transport roller pair 10A, 10B in the first transport roller pair group 210 is configured by a drive shaft 11 and a rubber roller portion 12 inserted through the drive shaft 11, and the first transport roller The first drive roller 10 a of the first transport roller pair 10 </ b> C, 10 </ b> D in the pair group 210 may be configured by the drive shaft 11, the rubber roller portion 12 inserted through the drive shaft 11, and the rough surface portion 13.
By deleting the rough surface portion 13, the cost of the driving roller 1 can be reduced.

(Modification 6)
In the above-described embodiment, the print head 111 included in the printing unit 110 is not limited to the line head type, and may be a serial head type that can move along the width direction that intersects the conveyance direction of the paper M.

(Modification 7)
In the above embodiment, the printing apparatus ejects or discharges fluid other than ink (liquid, liquid material in which particles of functional material are dispersed or mixed, or fluid such as gel). Then, a fluid ejecting apparatus that performs printing may be used. For example, printing is performed by ejecting a liquid material containing a material such as an electrode material or a color material (pixel material) used for manufacturing a liquid crystal display, an EL (electroluminescence) display, and a surface emitting display in a dispersed or dissolved state. A liquid ejecting apparatus may be used. Moreover, the fluid body injection apparatus which injects fluid bodies, such as a gel (for example, physical gel), may be sufficient. The present invention can be applied to any one of these fluid ejecting apparatuses. In the present specification, the term “fluid” is a concept that does not include a fluid consisting only of gas. Examples of the fluid include liquid (inorganic solvent, organic solvent, solution, liquid resin, liquid metal (metal melt), etc. ), Liquids, fluids, and the like.

  10, 20, 30, 40, 50 ... conveying roller pair, 10a, 20a, 30a, 40a, 50a ... driving roller, 10b, 20b, 30b, 40b, 50b ... driven roller, 100 ... printing unit, 101 ... housing, DESCRIPTION OF SYMBOLS 102 ... Operation part, 103 ... Paper cassette, 103a ... Grip part, 104 ... Front plate cover, 109 ... Discharge tray, 200 ... Intermediate unit, 201 ... Conveyance path, 210 ... First conveyance roller pair group, 220 ... Second Transport roller pair group, 230 ... third transport roller pair group, 240 ... fourth transport roller pair group, 250 ... first transport roller pair group, 260 ... correction roller pair, 270 ... discharge roller pair, 291 ... housing, 292 ... Carry-in port, 293 ... Carry-out port, 300 ... Post-processing unit, 500 ... Post-processing device, 1000 ... Printing device.

Claims (10)

A carry-in port through which the medium is carried in from a printing unit for discharging liquid and printing an image on the medium;
A carry-out port for carrying out the medium to a post-processing unit that performs post-processing on the medium;
A transport path disposed between the carry-in port and the carry-out port;
An intermediate unit having
The transport path includes
A first transport roller pair group provided with a plurality of transport roller pairs each having a drive roller that applies a force in the transport direction to the medium, and a driven roller that nips the medium between the drive rollers and is driven to rotate.
A correction roller pair that is positioned downstream of the first transport roller pair group in the transport direction and corrects skew of the medium in the transport direction;
An intermediate unit comprising:   When the correction roller pair conveys the smallest size medium that can be carried, the tip of the smallest size medium reaches the carry-out port while the smallest size medium is nipped and carried by the correction roller pair. The intermediate unit according to claim 1, wherein the intermediate unit is arranged as follows. The correction roller pair includes a first roller that rotationally drives the medium in a direction of transporting the medium toward the carry-out port, and a second roller that nips the medium between the first roller and rotates following the medium. ,
The intermediate unit according to claim 2, wherein the first roller has a surface provided with a convex portion capable of making point contact with the medium. The first transport roller pair group includes:
Consisting of a plurality of first transport roller pairs driven by the same motor,
An upstream first transport roller pair disposed on the upstream side in the transport direction with respect to the correction roller pair;
A downstream first transport roller pair disposed upstream of the correction roller pair in the transport direction, and disposed downstream of the upstream first transport roller pair in the transport direction;
When correcting the skew, the conveyance force applied to the medium by the upstream first conveyance roller pair is released, and then the conveyance force applied to the medium by the downstream first conveyance roller pair is released. The intermediate unit according to claim 3. A second transport roller pair group that is disposed upstream of the first transport roller pair group in the transport direction and in which a plurality of transport roller pairs that are driven by the same motor are disposed;
The distance between the first transport roller pair disposed on the most upstream side in the first transport roller pair group and the second transport roller pair disposed on the most downstream side in the second transport roller pair group is the first transport. 5. The intermediate unit according to claim 4, wherein the intermediate unit is longer than a distance between a first transport roller pair disposed on the most downstream side in the roller pair group and the correction roller pair. The intermediate unit according to any one of claims 1 to 5,
A placement unit that is disposed downstream of the intermediate unit in the transport direction and places the medium carried out from the carry-out port, and performs post-processing on the medium placed on the placement unit A post-processing unit having a post-processing unit;
A post-processing device comprising: The medium carried between a driving roller that discharges liquid and prints an image on a medium in a conveying unit that conveys the medium in a conveying direction and applies a force in the conveying direction to the medium. A transport roller pair group provided with a plurality of transport roller pairs having a driven roller that is nipped and driven to rotate;
A placement unit for placing the medium;
A post-processing unit that performs post-processing on the medium mounted on the mounting unit;
Including
A post-processing apparatus, wherein a correction roller pair for correcting skew of the medium in the transport direction is provided between the transport roller pair group and the placement unit. Between the transport roller pair group and the placement unit, further includes a placement unit side transport roller pair,
When the medium of the minimum size that can be conveyed is conveyed, the correction roller pair nips the medium of the minimum size by the correction roller pair and conveys the leading end of the medium of the minimum size as described above. The post-processing apparatus according to claim 7, wherein the post-processing apparatus is arranged to reach the roller pair. A post-processing device according to any one of claims 6 to 8,
A printing unit that is disposed upstream of the post-processing apparatus in the transport direction and that discharges the liquid and prints an image on the medium;
A printing apparatus comprising: A printing unit for discharging liquid and printing an image on a medium;
Transport provided with a plurality of transport roller pairs each having a drive roller that applies a force in the transport direction to the medium fed from the printing unit, and a driven roller that nips the medium between the drive rollers and is driven to rotate. A pair of rollers,
A placement unit for placing the medium;
A post-processing unit that performs post-processing on the medium mounted on the mounting unit;
Including
A printing apparatus, wherein a correction roller pair for correcting skew of the medium in the transport direction is provided between the transport roller pair group and the placement unit.

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