JP2017154831A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer which can suppress contamination in a conveyance path for conveying a medium subjected to two-sided printing.SOLUTION: A printer capable of performing two-sided printing on a sheet P includes: a bending path 151a which bends and conveys a medium so that the second recording surface subjected to printing just before out of two sides of the sheet P becomes the inner side when conveying the sheet P subjected to two-sided printing; and a plurality of spur rollers 203 which are arranged so as to be in contact with the sheet P and rotate in the bending path 151a. The bending path 151a includes: a first wall part 211 which faces the first recording surface subjected to printing prior to the second recording surface out of the two sides of the sheet P and is bent on the relatively outer side; and a second wall part 221 which faces the second recording surface subjected to printing just before out of the two sides of the sheet P and is bent on the relatively inner side. At least a portion of the plurality of spur rollers 203 is provided in the first wall part 211.SELECTED DRAWING: Figure 13

Description

  The present invention relates to a printing apparatus capable of, for example, duplex printing on a medium.

  2. Description of the Related Art Conventionally, inkjet printers that print on a medium by ejecting ink (printing material) supplied to a recording head (liquid ejecting head) from nozzles formed on the recording head are widely known as a type of printing apparatus. It has been. Also, in such printers, paper (medium) printed on one side by ink jetting and conveyed downstream is switched back during conveyance after the printing, and is also applied to the other side. There is a printing apparatus that can perform double-sided printing that performs printing by ejecting ink (for example, Patent Document 1).

Japanese Patent Laying-Open No. 2015-189006

  By the way, in a printing apparatus capable of double-sided printing, when the paper that has been printed on both sides is transported along the transport path toward the discharge unit, the ink on the surface printed first on both sides of the paper remains undried. If so, there is a risk that the undried ink will adhere and stain the inside of the transport path. In particular, in an ink jet printer that performs printing on a sheet at high speed, there is a high possibility that the ink on the surface that has been printed first after double-sided printing is undried, so this problem may become more prominent.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a printing apparatus that can prevent the inside of a conveyance path for conveying a medium on which double-sided printing has been performed from becoming dirty.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
A printing apparatus that solves the above problem is a printing apparatus that can perform double-sided printing on a medium such that when the medium printed on both sides is transported, the surface printed immediately before the both sides of the medium is on the inside. A curved path that is curved and conveyed; and a plurality of spur rollers that are arranged to rotate in contact with the medium in the curved path, and the curved path is printed first on both sides of the medium. A first wall portion that is opposed to the opposite surface and is curved relatively outward, and a second wall portion that is opposed to the immediately printed surface of both sides of the medium and is relatively curved on the inner side. And at least a part of the plurality of spur rollers is provided on the first wall portion.

  When a medium printed on both sides is transported in a curved path having a first wall that is curved relatively outward and a second wall that is curved relatively inward, the surface printed immediately before The surface printed on the opposite side to the side faces the first wall portion that curves relatively outward. Then, when the medium is conveyed while being curved in the curved path, a force is applied to the medium to return to the flat surface, and the first printed surface of both surfaces of the medium is displaced outward to the first wall portion. There is a risk of contact. For this reason, if the printing material used for printing on the previously printed surface is not dried, the printing material may adhere to the first wall portion and stain the curved path.

  In this regard, according to the above configuration, at least a part of the plurality of spur rollers is provided on the first wall portion that curves relatively outward in the curved path. Therefore, when the double-sided printed medium is conveyed in the curved path, it is possible to reduce the possibility that the previously printed surface on which the printing material used for printing is undried contacts the first wall portion. Therefore, it is possible to prevent the inside of the transport path for transporting the medium on which double-sided printing has been performed from becoming dirty.

Moreover, in the said printing apparatus, it is preferable that the said spur roller is provided in each of the said 1st wall part and the said 2nd wall part.
According to the said structure, a spur roller is provided not only in the 1st wall part which curves relatively outside but in the 2nd wall part which curves relatively inside. Therefore, compared to the case where the spur roller is not provided on the second wall portion, the medium is printed just before facing the second wall portion of the medium while properly transporting the medium sandwiched from both front and back surfaces. It can suppress that the printing material etc. which were used for surface printing adhere to the 2nd wall part.

  Further, in the printing apparatus, the first wall portion includes a curved first surface on the first inner surface facing a previously printed surface of both surfaces of the medium, while the second wall portion is It is preferable that the 2nd inner surface which opposes the surface printed immediately before among the both surfaces of the said medium is comprised by the plane which continues in several bent shape.

  In the case where the first wall portion that is curved on the outer side and the second wall portion that is curved on the inner side in the curved path are the same curved surfaces or planes that are continuous in the same plurality of bent shapes, If the first inner surface of the first wall portion and the second inner surface of the second wall portion are too close at the time of assembling the printing apparatus due to dimensional tolerance or the like, the entire curved path is excessively narrowed. There is a fear.

  In this regard, according to the above-described configuration, the first inner surface of the first wall portion that curves relatively outward is a curved surface, while the second wall portion that curves relatively inward facing the second inner surface is curved. The inner surface of 2 is comprised by the plane which continues in a some bending shape. Therefore, even when the first inner surface of the first wall portion and the second inner surface of the second wall portion are too close due to the influence of dimensional tolerance, the first inner surface which is a curved surface and a plurality of bent shapes are formed. A gap that can widen the curved path is formed between the first inner surface and the second inner surface, for example, when the first inner surface and the second inner surface are curved surfaces. Therefore, by expanding the curved path by such a gap, it is possible to reduce the possibility that the medium printed on both sides contacts the inner surface of the curved path when being conveyed through the curved path.

  A printing apparatus that solves the above problem is a printing apparatus capable of duplex printing on a medium, and is arranged so as to rotate in contact with the medium in a conveyance path for conveying the medium printed on both sides. A plurality of spur rollers, wherein the transport path includes a first wall portion facing a previously printed surface of both surfaces of the medium, and a surface printed immediately before of both surfaces of the medium; A plurality of spur rollers provided on each of the first wall portion and the second wall portion.

  According to the said structure, a spur roller is provided not only in the 1st wall part facing the surface printed on the front of a medium but in the 2nd wall part facing the surface printed immediately before. Therefore, compared to the case where the spur roller is not provided on the second wall portion, the medium is printed just before facing the second wall portion of the medium while properly transporting the medium sandwiched from both front and back surfaces. It can suppress that the printing material used for surface printing adheres to a 2nd wall part.

  In the printing apparatus, the transport path is a curved path that is curved and transported so that a surface printed immediately before of both sides of the medium is inside when transporting the double-side printed medium. The first wall portion has a first inner surface that curves relatively outward in the curved path, and the second wall portion is second curved relatively inward in the curved path. It is preferable to have the inner surface.

  When the medium printed on both sides is conveyed while being curved in the curved path, the first inner surface of the first wall portion that curves relatively outward and the second wall portion that curves relatively inside. There is a risk of contact with the second inner surface. Therefore, if the printing material used for double-sided printing is undried, the printing material adheres to the first inner surface of the first wall portion and the second inner surface of the second wall portion, and the inside of the curved path. There is a possibility of getting dirty.

  In this regard, according to the above-described configuration, the plurality of spur rollers are provided on each of the first wall portion that curves relatively outward and the second wall portion that curves relatively inside in the curved path. . Therefore, when the medium printed on both sides is conveyed in the curved path, it is possible to reduce the possibility that the surface of the medium on which the printing material used for double-sided printing is undried contacts the inner surface of the curved path.

  Further, in the printing apparatus, the second wall portion is curved by a plurality of planes continuing in a bent shape, and the spur roller provided on the second wall portion is a joint portion of the plurality of planes. Are preferably arranged side by side in a direction perpendicular to the conveyance direction of the medium.

  According to the said structure, since a spur roller is arrange | positioned in the junction part of the several plane used as the part where the 1st wall part and the 2nd wall part are the closest in the 2nd wall part, it is a junction part. The occurrence of poor conveyance of the medium in the vicinity is reduced.

In the printing apparatus, it is preferable that the spur roller provided on the first wall portion and the spur roller disposed on the second wall portion do not face each other.
According to the above configuration, since the spur rollers do not face each other, there is no possibility that the spur roller is pressed from both one side and the other side of the medium and the medium is bent.

  In the printing apparatus, the spur roller provided on the first wall is arranged in a plurality of rows in a direction perpendicular to the medium transport direction, and is adjacent to the medium transport direction. It is preferable that the spur roller includes a portion where the arrangement in a direction orthogonal to the transport direction is staggered.

  The medium conveyed through the curved path tends to bulge outward due to the tension of the medium. Therefore, the part where the end of the medium comes into contact with the first inner surface of the first wall that curves relatively outward in the curved path differs depending on the type and state of the medium. In this regard, according to the above configuration, the first wall portion that is curved relatively outward in the curved path includes a portion in which the spur rollers are arranged to be different from each other. Spur rollers can be densely provided in the conveyance direction of the medium. For this reason, the end of the medium swollen to the outside and the spur roller easily come into contact with each other, and the medium can be suitably conveyed.

In the printing apparatus, it is preferable that the first wall portion includes a metal material and the second wall portion includes a resin material.
According to the said structure, since the 2nd wall part is comprised with a resin material, the bearing for attaching a spur roller can be formed integrally. For this reason, compared with the structure which forms a bearing separately and attaches to a 2nd wall part, a spur roller can be provided densely in the direction orthogonal to the conveyance direction of a medium.

The printing apparatus preferably includes a driving roller provided on the first wall.
According to the above configuration, since the driving roller is provided on the first wall portion that does not face the surface printed immediately before the double-side printed medium, the printing material used for printing may adhere to the driving roller. It is suppressed.

1 is a schematic structural diagram of a printer including a printing apparatus. FIG. 3 is a schematic structural diagram showing a part of a medium transport device in a state where a movable unit is pulled out. FIG. 5 is a schematic structural diagram showing a part of a recording system when a second unit and a third unit are rotated in a state where a movable unit is pulled out. The perspective view which shows the 1st unit in a movable unit. The top view which shows the 1st unit in a movable unit. The front view which shows the 1st unit in a movable unit. The perspective view of a spur roller and a bearing provided in a 1st wall part. The top view of a spur roller and a bearing provided in a 1st wall part. The perspective view which shows the 2nd unit in a movable unit. The perspective view of the spur roller and bearing which are provided in a 2nd wall part. The top view of a spur roller and a bearing provided in a 2nd wall part. The projection which developed the 1st wall part on the plane and projected the position of the spur roller provided in the 2nd wall part. The schematic diagram which shows a part of discharge route. The schematic diagram which expands and shows the curved path | route of FIG.

Hereinafter, a printer as a printing apparatus will be described with reference to the drawings.
As shown in FIG. 1, a printer 100 is an ink jet printer that records an image such as a character or a photograph by attaching ink as an example of a liquid to paper P as a medium. Contained. The printer 100 includes a path for reversing the paper P, and can perform double-sided printing on the paper P. The printer 100 can print on the paper P at high speed. For example, it is possible to convey A4 size paper P in the horizontal direction and print 100 pages per minute. In the vertical direction Z, an operation unit (not shown) for performing various operations of the printer 100 is attached to the upper portion of the housing 101.

  In the printer 100, a sheet cassette 103 is provided in the vertical direction Z from the center to the bottom of the printer 100. A plurality of paper cassettes 103 are arranged side by side in the vertical direction Z, and each of the paper cassettes 103 stores paper P to be recorded by the printer 100 in a stacked state. The paper cassette 103 is configured to be able to be inserted into and removed from the housing 101 in the front-rear direction Y that intersects both the transport direction X and the vertical direction Z of the paper P. The paper P stored in each paper cassette 103 may be of a different type or the same type.

  In the printer 100, a drawing surface portion 108 that can be pulled out from the housing 101 is provided on the left side, which is the left side in FIG. 1. At the upper part in the vertical direction Z of the pull-out surface part 108, a handle part 108a that can be handled by the user is formed. When the pull-out surface portion 108 is pulled out from the housing 101 along the pull-out direction that is leftward in the transport direction X, the movable unit 200 described later is pulled out from the housing 101 in conjunction with this (see FIGS. 2 and 3). . Further, a discharge port 109 through which the recorded paper P is discharged is formed in the drawer surface portion 108 at a position below the vertical direction Z in the handle portion 108a. A discharge tray (not shown) is provided at the discharge port 109.

Next, the structure of the printer 100 will be described.
The printer 100 includes a recording unit 110 that performs recording on the paper P from above in the vertical direction Z, and a transport unit 130 that transports the paper P along the transport path 120. The transport path 120 is formed so that the paper P is transported with the direction crossing the width direction as the transport direction X when the direction along the front-rear direction Y is the width direction of the paper P. The paper P is transported in the transport path 120 such that the center of the paper P in the width direction (the front-rear direction Y of the printer 100) coincides with the center of the transport path 120.

  The recording unit 110 includes a line head type recording head 111 that can simultaneously eject ink over substantially the entire width direction of the paper P. The recording unit 110 forms an image on the paper P by the ink ejected from the recording head 111 being attached to the recording surface (the surface on which the image is printed) facing the recording head 111 on the paper P.

  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 recording unit 110. In other words, ink is ejected from the recording head 111 onto the paper P being conveyed by the belt conveyance unit 132, and recording is performed.

  The belt conveyance unit 132 includes a driving roller 133 disposed upstream of the recording head 111 in the conveyance direction X, a driven roller 134 disposed downstream of the recording head 111 in the conveyance direction X, and these And an endless belt 135 hung on each of the rollers 133 and 134. When the driving roller 133 is driven and rotated, the belt 135 circulates, and the paper P is conveyed to the downstream side by the circulated belt 135. That is, the outer peripheral surface of the belt 135 functions as a support surface that supports the paper P on which recording is performed.

  The transport path 120 includes a supply path 140 through which the paper P is transported toward the recording unit 110, a discharge path 150 through which the paper P that has been recorded and recorded by the recording unit 110 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 P inserted from the insertion port 141 b exposed by opening the paper supply cover 141 a provided on the right side surface of the housing 101 is conveyed to the recording unit 110. A first drive roller pair 144 is provided in the first supply path 141, and the sheet P inserted from the insertion port 141 b is linearly directed toward the recording unit 110 by the rotational drive of the first drive roller pair 144. Be transported.

  In the second supply path 142, in the vertical direction Z, the paper P stored in the paper cassette 103 provided at the lower part of the housing 101 is conveyed to the recording unit 110. A pickup roller 142 a and a separation roller pair 145 are provided near each paper cassette 103 in the second supply path 142. The paper P stored in the paper cassette 103 in a stacked state is fed by the pickup roller 142a and separated one by one by the separation roller pair 145, and then the posture in the vertical direction Z is reversed. The second drive roller pair 146 provided in the second supply path 142 is conveyed toward the recording unit 110 by the rotational drive.

  In the third supply path 143, when performing double-sided printing in which images are recorded on both sides of the paper P, the paper P on which one side has been recorded by the recording unit 110 is conveyed again to the recording unit 110. That is, a branch path 160 that branches from the discharge path 150 is provided downstream of the recording unit 110 in the transport direction X. When performing duplex printing, the paper P 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 P 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 P conveyed to the branch path 160 is reversely transported from the downstream side to the upstream side in the branch path 160 by the branch path roller pair 161 that is reversed.

  The sheet P that is reversely conveyed from the branch path 160 is conveyed to the third supply path 143 and is conveyed toward the recording unit 110 by a plurality of conveyance roller pairs 131. The third supply path 143 bypasses the recording unit 110 and merges with the first supply path 141 and the second supply path 142 on the upstream side of the recording unit 110. For this reason, as the sheet P is conveyed through the third supply path 143, the other side on which the paper P is not printed is reversed so as to face the recording unit 110, and the recording unit 110 is rotated by the third driving roller pair 148. It is conveyed toward. That is, the third supply path 143 functions as a reverse transport path for transporting the paper P while reversing the posture of the paper P 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 P toward the recording unit 110 while the posture of the paper P is curved in the vertical direction Z. . On the other hand, compared with the second supply path 142 and the third supply path 143, the first supply path 141 causes the sheet P to be directed toward the recording unit 110 without being greatly curved. Be transported.

  The sheet P conveyed through the supply paths 141, 142, and 143 is conveyed to the alignment roller pair 149 disposed upstream of the recording unit 110 in the conveyance direction X, and then the alignment roller pair 149 whose rotation has stopped. The tip hits. And the inclination with respect to the conveyance direction X is correct | amended (skew removal) by the state which the paper P contact | abutted to such an alignment roller pair 149. FIG. Then, the sheet P whose inclination is corrected is aligned and conveyed to the recording unit 110 by the subsequent rotational driving of the alignment roller pair 149.

  The recording unit 110 performs recording on one side or both sides, and the sheet P on which recording is completed is transported along a discharge path 150 that forms a downstream part of the transport path 120 by a transport roller pair 131. The discharge path 150 is branched to 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 paper P for which recording has been completed is transported through the common discharge path 154 that constitutes the upstream portion of the discharge path 150, and then is guided by the guide mechanism 180 provided at the downstream end of the common discharge path 154. It is guided to any one of the first to third discharge paths 151, 152, 153 constituting the downstream portion. In this respect, the discharge path 150 corresponds to “a transport path for transporting the double-side printed paper P”.

  The first discharge path 151 is provided so as to extend upward of the housing 101 and bend along the branch path 160. The sheet P 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. Then, the paper P 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. The paper P is discharged from the discharge port 155 to the mounting table 156 in a posture in which the recording surface in 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 transport direction X in FIG. 1, which is also the discharge direction of the paper P from the discharge port 155. The paper P is placed on the mounting table 156 in a stacked state. At this time, each sheet P 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.

  Further, the first discharge path 151 includes a curved path 151 a that reverses the front and back of the paper P while the paper P recorded by the recording unit 110 is conveyed to the discharge port 155. The curved path 151a is curved so that the recording surface of the paper P recorded by the recording unit 110 is inward, and the recording surface is directed from the upper side in the vertical direction Z to the lower side in the vertical direction Z in the vertical direction Z. The paper P is reversed. Therefore, in the discharge path 150, the paper P passes through the curved path 151 a and is discharged from the discharge port 155 so that the recording surface at the time of single-sided printing faces the mounting table 156. In double-sided printing, the previously recorded recording surface (hereinafter referred to as “first recording surface”) faces upward, and the immediately preceding recording surface (hereinafter referred to as “second recording surface”) is the mounting table 156. It is discharged from the discharge port 155 in a confronting state. In other words, the curved path 151a conveys the double-side printed paper P in a curved manner so that the second recording surface of the both sides of the paper P is inside.

  The second discharge path 152 branches below the first discharge path 151 in the vertical direction Z, and extends linearly from the recording unit 110 toward the lead-out surface part 108 that forms a part of the housing 101. . Therefore, the sheet P conveyed through the second discharge path 152 is not conveyed in a curved posture as in the first discharge path 151, and the posture is kept constant as when passing through the recording unit 110. As it is, it is conveyed linearly and discharged from a discharge port 109 formed in the drawing surface portion 108. In other words, the second discharge path 152 functions as a non-reverse discharge path for discharging the paper P without reversing the posture of the paper P in the vertical direction. The third discharge path 153 is branched 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. The third discharge path 153 can be connected to, for example, a post-processing apparatus that performs drying or sorting of the paper P.

  A part of the discharge path 150 and a part of the branch path 160 are provided in the movable unit 200 provided in the housing 101. That is, the movable unit 200 includes a part of the transport path 120. The movable unit 200 is connected to the drawer surface portion 108 so as to be integrally handled. Therefore, the movable unit 200 is pulled out of the casing 101 when the pull-out surface portion 108 is pulled out and exposed from the casing 101.

  The guide mechanism 180 has a first guide part 181 and a second guide part 182. Each guide unit 181, 182 is provided at a branching position 190 that branches from the downstream end of the common discharge path 154 to each of the first to third discharge paths 151, 152, 153, and the conveyance direction of the paper P from the recording unit 110 In X, the first guide portion 181 is shifted and the second guide portion 182 is located on the left side which is the downstream side, and is shifted. Also in the vertical direction Z, the first guide portion 181 and the second guide portion 182 are arranged so as to be shifted so as to be located on the lower side and the second guide portion 182 on the upper side.

  Further, each of the guide portions 181 and 182 can be rotated around a shaft (not shown) provided at a base end portion that is a left portion on the downstream side in the transport direction X. The guide portions 181 and 182 are pivoted about their respective axes, so that the position of the tip portion on the right side on the upstream side in the transport direction X and opposite to the base end portion is vertical. It is displaced up and down in the direction Z. That is, the guide portions 181 and 182 are rotatably provided between two positions, that is, an upper position where the leading end portion located upstream in the conveyance direction of the paper P is located above and a lower position located below. It has been. Incidentally, the leading end portion of the first guide portion 181 is located upstream of the leading end portion of the second guide portion 182 in the transport direction of the paper P.

  Each of the guide portions 181 and 182 is selectively switched to the upper position or the lower position, and comes into contact with the conveyed paper P through the common discharge path 154, thereby discharging the paper P to the first to third discharges. Guide to one of the routes 151, 152, 153. Incidentally, the guide portions 181 and 182 are configured so as not to interfere with each other by, for example, being formed in a comb-like shape from the base end portion to the tip end portion so as not to inhibit the mutual rotation operation. In addition, this rotation operation in each guide part 181 and 182 is controlled by the control part (illustration omitted) with which the printer 100 is provided.

  When both the front end portion of the first guide portion 181 and the front end portion of the second guide portion 182 are located at the lower position, the front end portion of the first guide portion 181 closes the upstream end of the third discharge path 153. The tip of the second guide portion 182 is positioned so as to close the upstream end of the second discharge path 152. Therefore, the guide mechanism 180 guides the paper P conveyed through the common discharge path 154 to the first discharge path 151.

  When the tip of the first guide 181 is in the lower position and the tip of the second guide 182 is in the upper position, the tip of the first guide 181 closes the upstream end of the third discharge path 153. The tip of the second guide portion 182 is positioned so as to close the upstream end of the first discharge path 151. For this reason, the guide mechanism 180 guides the paper P conveyed through the common discharge path 154 to the second discharge path 152.

  When both the front end portion of the first guide portion 181 and the front end portion of the second guide portion 182 are located at the upper position, the front end portion of the first guide portion 181 is connected to the upstream end of the first discharge path 151 and the second end portion. It is positioned so as to block the upstream end of the discharge path 152, and the tip of the second guide portion 182 is positioned so as to close the upstream end of the first discharge path 151. For this reason, the guide mechanism 180 guides the sheet P conveyed through the common discharge path 154 to the third discharge path 153.

  As shown in FIGS. 2 and 3, the movable unit 200 includes a first unit 210 supported so as to be able to be pulled out with respect to the housing 101, a second unit 220 and a third unit attached to the first unit 210. Unit 230.

  In the movable unit 200, a first unit 210, a second unit 220, and a third unit 230 are stacked in this order from the lower side to the upper side in the vertical direction Z. A part of the common discharge path 154 and a part of the first discharge path 151 are formed between the first wall part 211 of the first unit 210 and the second wall part 221 of the second unit 220. The A branch path 160 is formed between the second wall portion 221 of the second unit 220 and the third wall portion 231 of the third unit 230. The curved path 151 a of the first discharge path 151 has a part of the first wall part 211 and a part of the second wall part 221.

  A plurality of spur rollers 203 are arranged in the discharge path 150. At least a part of the plurality of spur rollers 203 is provided on the first wall portion 211. The plurality of spur rollers 203 are provided on each of the first wall portion 211 and the second wall portion 221. The spur roller 203 is disposed in the discharge path 150 so as to rotate in contact with the paper P. As shown in FIG. 7, the spur roller 203 includes a pair of thin rollers 203a and a rotating shaft 203b. The thin roller 203a includes a convex portion and a concave portion on the outer periphery. The pair of thin rollers 203a is preferably overlapped in the axial direction so that the convex portions are staggered. Further, as shown in FIG. 1, in the discharge path 151, the transport roller pair 131 is configured by a driving roller 202 and a spur roller 203.

  As shown in FIG. 4, the first unit 210 includes a flat portion 211a that forms an upstream straight path (common discharge path 154 in FIG. 1) in the transport direction X, and a curve that is downstream of the flat portion 211a. The first wall portion 211 including the portion 211b is provided. The first wall portion 211 faces the first recording surface of both sides of the paper P.

  The flat portion 211a includes a metal material and is obtained by processing a plate-like material. The curved portion 211b includes a metal material and is obtained by bending a plate-like material. The first inner surface 212b on the discharge path 150 (see FIG. 1) side of the curved portion 211b is configured by a curved surface. That is, the first wall portion 211 has a first inner surface 212b that is curved relatively outward in the curved path 151a. The flat surface 212 a of the flat surface portion 211 a and the first inner surface 212 b of the curved portion 211 b constitute the first surface 212 of the first wall portion 211.

  As shown in FIGS. 5 and 6, the first wall portion 211 is provided with an opening 213 for disposing the drive roller 202 and an attachment portion 214 to which the bearing 215 of the spur roller 203 is attached. The opening 213 includes a first opening 213a provided on the upstream side of the first wall portion 211, a second opening 213b formed at the boundary between the flat surface portion 211a and the curved portion 211b, and the first wall. 3rd opening 213c provided in the downstream of the part 211 is included. As shown in FIG. 13, the drive roller 202 is provided so as to protrude from the first surface 212 toward the second wall portion 221. The driving roller 202 is provided on the first wall portion 211.

  As shown in FIG. 5, the attachment portion 214 is a hole obtained by punching a metal material. The attachment portion 214 is provided on each of the flat portion 211a and the bending portion 211b. The plurality of attachment portions 214 are formed side by side in the front-rear Y direction orthogonal to the transport direction X. As shown in FIG. 5, two rows of attachment portions 214 are formed on the flat surface portion 211a. As shown in FIG. 6, six rows of attachment portions 214 are formed in the bending portion 211b.

  As shown in FIGS. 7 and 8, the bearing 215 is formed separately from the first wall portion 211 and is fitted into the attachment portion 214. The spur roller 203 provided on the first wall portion 211 of the first unit 210 is provided so as to protrude from the first surface 212 toward the second wall portion 221 (see FIG. 13).

  As shown in FIG. 9, the second unit 220 includes a second wall portion including a planar portion 221a that forms an upstream linear path in the transport direction X, and a curved portion 221b that is downstream of the planar portion 221a. 221 is provided. The second wall portion 221 faces the second recording surface of both sides of the paper P, and is curved relatively inward in the curved path 151a.

  The flat surface part 221a contains a metal material and is obtained by processing a plate-like material. The curved portion 221b includes a resin material and is obtained by integral molding. The second inner surface 222b of the curved portion 221b on the discharge path 150 (see FIG. 1) side is configured by a plurality of flat surfaces 222a that are continuous in a bent shape. That is, the second wall portion 221 has a second inner surface 222b that curves relatively inward in the curved path 151a. The flat surface 222a of the flat surface portion 221a and the second inner surface 222b of the curved portion 221b constitute the second surface 222 of the second wall portion 221.

  A mounting portion 223 to which the bearing 225 of the spur roller 203 is mounted is provided on the flat surface portion 221a. The bearing 225 has the same structure as the bearing 215 shown in FIGS. The attachment portion 223 is a hole obtained by punching a metal material. The plurality of attachment portions 223 are formed side by side in the front-rear direction Y orthogonal to the transport direction X. Four rows of attachment portions 223 are formed on the flat portion 211a.

  The curved portion 221b is provided with a bearing 224 that supports the spur roller 203. As shown in FIGS. 10 and 11, the bearing 224 is formed integrally with the curved portion 221b. The spur roller 203 provided on the first wall portion 211 of the first unit 210 is provided so as to protrude from the first surface 212 toward the second wall portion 221 (see FIG. 13).

  As shown in FIG. 3, the third unit 230 includes a third wall portion 231. The third unit 230 is rotatably attached to the first unit 210 and the second unit 220 via the shaft 201. The third wall portion 231 includes a resin material. The third wall portion 231 is an integrally molded product.

Next, an operation method for solving the conveyance failure of the paper P in the printer 100 will be described.
In a recording apparatus that records on a sheet-like medium such as paper P and conveys the same as in the printer 100 shown in FIG. 1, conveyance of a paper jam or the like while the paper P is being conveyed along a path. Defects may occur. In particular, in a recording apparatus that performs recording by discharging a liquid such as ink onto a medium, the recording surface of the paper P expands, and a curl that makes the recording surface convex is more likely to occur than in the recording unit 110. A conveyance failure is likely to occur on the downstream side. In view of this, the printer 100 according to the present embodiment allows the housing 101 to move a part of the discharge path 150 and a part of the branch path 160 by moving the movable unit 200 in order to make it easy to take out the paper P that is jammed during the conveyance. It can be pulled out from.

  When the paper P is jammed in the discharge path 150 and the branch path 160, the user holds the hand 108 a formed on the drawing surface portion 108 and pulls out the paper P along the conveyance direction X. The surface part 108 is pulled out. When the drawing surface portion 108 is pulled out, the movable unit 200 is pulled out from the housing 101 together with the drawing surface portion 108. That is, a part of the curved path 151a, the second discharge path 152, the third discharge path 153, and the branch path 160 constituting the discharge path 150 is drawn out. Further, the guide mechanism 180 provided at the branch position 190 that is the downstream end of the common discharge path 154 is also pulled out of the housing 101.

  As shown in FIG. 2, after the movable unit 200 is pulled out from the housing 101, the second unit 220 and the third unit 230 attached to the movable unit 200 are rotated clockwise about the shaft 201. Let Then, as shown in FIG. 3, the second inner surface 222b of the curved path 151a constituting the first discharge path 151 is separated from the first surface 212, and the outer inner surface and the inner inner surface of the branch path 160 are separated from each other. Separate. For this reason, the curved path 151a and the branch path 160 are opened, and the paper P that has jammed in the path can be taken out.

Next, the positional relationship between the driving roller 202 and the spur roller 203 of the first unit 210 and the second unit 220 will be described with reference to FIG.
The drive roller 202 is arranged by forming a plurality of drive roller rows L in the front-rear direction Y orthogonal to the transport direction X. The first wall portion 211 of the present embodiment is provided with first to third drive roller rows L1 to L3. The first drive roller row L1 is provided on the upstream side in the transport direction X of the flat portion 211a. The second drive roller row L2 is provided between the flat surface portion 211a and the bending portion 211b. The third drive roller row L3 is provided on the downstream side in the conveyance direction X of the bending portion 211b.

  The spur roller 203 provided on the first wall portion 211 of the first unit 210 is arranged by forming a plurality of spur roller rows M in the front-rear direction Y orthogonal to the transport direction X. The first wall portion 211 of the present embodiment is provided with first to eighth spur roller rows M1 to M8. The spur rollers 203 of the spur roller row M adjacent in the transport direction X include portions where the arrangement in the front-rear direction Y is staggered.

  The 1st spur roller row | line | column M1 and the 2nd spur roller row | line | column M2 are provided between the 1st drive roller row | line | column L1 and the 2nd drive roller row | line | column L2 in the plane part 211a. The spur roller 203 constituting the first spur roller row M1 and the spur roller 203 constituting the second spur roller row M2 are arranged at different positions in the front-rear direction Y.

  The third spur roller row M3, the fourth spur roller row M4, the fifth spur roller row M5, and the sixth spur roller row M6 are arranged in the curved portion 211b with the second drive roller row L2 and the third spur roller row M6. Provided between the drive roller row L3. The spur roller 203 constituting the third and fifth spur roller rows M3 and M5 and the spur roller 203 constituting the fourth and sixth spur roller rows M4 and M6 are arranged at different positions in the front-rear direction Y. Is done. About the 3rd-6th spur roller row | line | column M3-6 arrange | positioned in the part where curvature becomes large, the bearing 215 which supports the 3rd spur roller row | line | column M3, and the bearing 215 which supports the 4th spur roller row | line | column M4 are , Partly overlaps in the transport direction X. Further, the bearing 215 that supports the fifth spur roller row M5 and the bearing 215 that supports the sixth spur roller row M6 partially overlap in the transport direction X. That is, the spur rollers 203 are densely arranged in the transport direction X in the portion where the third to sixth spur roller rows M3 to M6 are arranged.

  The seventh spur roller row M7 and the eighth spur roller row M8 are provided on the downstream side in the transport direction X from the third drive roller row L3 in the bending portion 211b. The spur roller 203 constituting the seventh spur roller row M7 and the spur roller 203 constituting the eighth spur roller row M8 are arranged at different positions in the front-rear direction Y.

  The spur roller 203 provided on the second wall portion 221 of the second unit 220 is arranged so as to form a plurality of spur roller rows N in the front-rear direction Y orthogonal to the transport direction X. First to eleventh spur roller rows N1 to N11 are provided on the second wall portion 221 of the present embodiment. The 1st-5th spur roller row | line | columns N1-N5 are provided in the plane part 221a. The sixth to eleventh spur roller rows N6 to N11 are provided in the bending portion 221b. The spur rollers 203 constituting the sixth to eleventh spur roller rows N6 to N11 are supported by the bearing 224 (see FIG. 9) because the supported bearing 224 (see FIG. 9) is formed integrally with the second wall portion 221. 9)) can be reduced. For this reason, the sixth to eleventh spur roller rows N6 to N11 can more closely provide the spur rollers 203 in the front-rear direction Y as compared to the spur roller row M. The number of spur rollers 203 constituting each of the sixth to eleventh spur roller rows N6 to N11 is greater than the number of spur rollers 203 constituting each of the spur roller rows M. The number of spur rollers 203 constituting each of the sixth to eleventh spur roller rows N6 to N11 of the present embodiment is 10 or 12, and the number of spur rollers 203 constituting each of the spur roller rows M is four. ~ 6.

  A part of the spur roller row N is disposed at a position facing the drive roller 202 of the drive roller row L. The other spur roller rows N are arranged in positions that are not opposed to the driving roller 202 of the driving roller row L and the spur rollers 203 of the spur roller row M in the transport direction X. That is, the spur roller 203 provided on the first wall portion 211 and the spur roller 203 disposed on the second wall portion 221 are disposed so as not to face each other.

  The first spur roller row N1 is disposed at a position facing the first drive roller row L1. The second spur roller row N2 is disposed at a position facing an intermediate portion between the first drive roller row L1 and the first spur roller row M1. The third spur roller row N3 is disposed at a position facing the first spur roller row M1, the second spur roller row M2, and the intermediate portion. The fourth spur roller row N4 is disposed at a position facing the first spur roller row M1, the second spur roller row M2, and the intermediate portion. The fifth spur roller row N5 is disposed at a position facing the second drive roller row L2. The sixth spur roller row N6 is disposed at a position facing an intermediate portion between the second drive roller row L2 and the third spur roller row M3. The seventh spur roller row N7 is disposed at a position facing an intermediate portion between the fourth spur roller row M4 and the fifth spur roller row M5. The eighth spur roller row N8 is disposed at a position facing an intermediate portion between the fifth spur roller row M5 and the sixth spur roller row M6. The ninth spur roller row N9 is disposed at a position facing the third drive roller row L3. The tenth spur roller row N10 is disposed at a position facing an intermediate portion between the third drive roller row L3 and the seventh spur roller row M7. The eleventh spur roller row N11 is disposed at a position facing an intermediate portion between the seventh drive roller row L7 and the eighth spur roller row M8.

  In the transport path 120 (see FIG. 1), the paper P is transported so that the center in the width direction coincides with the center in the front-rear direction Y of the transport path 120. For this reason, in the front-rear direction Y, a portion where an end portion of a general type of paper P does not pass is generated. In such a portion, for example, the second wall portion 221, it is less necessary to provide the spur roller 203 in a part between the central portion and the end portion in the front-rear direction Y. For this reason, among the spur roller rows N, the spur roller rows N6, N7, N8, N10, and N11 that are not opposed to the drive roller row L are spur rollers 203 in a part between the central portion and the end portion in the front-rear direction Y. Is not provided.

  As shown in FIGS. 13 and 14, the spur roller 203 provided on the second wall portion 221 is arranged side by side in the front-rear direction Y orthogonal to the transport direction X of the paper P at the joint portions 222 d of the plurality of flat surfaces 222 c. The Specifically, the seventh to eleventh spur roller rows N7 to N11 located in the curved path 151a are arranged along the joint portion 222d.

The operation of the printer 100 will be described.
When the double-side printed paper P is conveyed through a curved path 151a having a first wall portion 211 that curves relatively outward and a second wall portion 221 that curves relatively inward, The second recording surface opposite to the recording surface is opposed to the first wall portion 211 that curves relatively outward. Then, when the sheet is conveyed while being curved in the curved path 151a, a force to return the sheet P to the plane acts, and the first recording surface of the both sides of the sheet P is displaced to the outside and the first wall is displaced. There is a risk of contact with the part. For this reason, if the ink used for printing on the first recording surface is not dried, the ink may adhere to the first wall portion 211 and stain the curved path 151a.

  At least a part of the plurality of spur rollers 203 is provided on the first wall portion 211 that curves relatively outward in the curved path 151 a of the printer 100. Therefore, when the double-side printed paper P is conveyed in the curved path 151a, the possibility that the first recording surface where the ink used for printing is undried contacts the first wall portion 211 can be reduced. .

  Further, since the spur roller 203 has irregularities on the outer periphery, the ink of the paper P is less likely to adhere to this roller as compared to a roller having no irregularities on the outer periphery. Since such a spur roller 203 is used in the printer 100, the discharge path 150 is further suppressed from being contaminated.

  Further, in the case where the first wall portion that is curved relatively outward in the curved path and the second wall portion that is curved relatively relatively inside are the same curved surfaces or planes that are continuous in the same plurality of bent shapes. In some cases, the first inner surface of the first wall portion and the second inner surface of the second wall portion are too close to each other when the printer 100 is assembled due to the influence of dimensional tolerance or the like. For this reason, there exists a possibility of making the whole curved path | route too narrow.

  In the printer 100, the first inner surface 212b of the first wall portion 211 that curves relatively outward is a curved surface, while the second wall portion 221 that curves relatively inward facing the second inner surface 212b. The inner surface 222b is configured by a flat surface 222c that is continuous in a plurality of bent shapes. Therefore, even when the first inner surface 212b of the first wall portion 211 and the second inner surface 222b of the second wall portion 221 are too close due to the influence of dimensional tolerance or the like, the first inner surface 212b and the second inner surface 212b For example, a gap is formed between the inner surface 222b and the first inner surface and the second inner surface can expand the curved path 151a as compared with the curved surface. Specifically, the distance between the first inner surface 212b and the second inner surface 222b increases as the distance from the joining portion 222d of the flat surface 212a increases. Therefore, by widening the curved path by such a gap, it is possible to reduce the possibility that the paper P printed on both sides will come into contact with the inner surfaces 212b and 222b of the curved path 151a when being conveyed through the curved path 151a.

According to the above embodiment, the following effects can be obtained.
(1) At least a part of the plurality of spur rollers 203 is provided on the first wall portion 211 that curves relatively outward in the curved path 151 a of the printer 100. Therefore, when the double-side printed paper P is conveyed in the curved path 151a, the possibility that the first recording surface where the ink used for printing is undried contacts the first wall portion 211 can be reduced. . Accordingly, it is possible to prevent the inside of the discharge path 150 that conveys the paper P on which double-sided printing has been performed from being dirty.

  (2) In the printer 100, the spur roller 203 is provided not only on the first wall portion 211 that curves relatively on the outside but also on the second wall portion 221 that curves relatively on the inside. Therefore, compared with the case where the spur roller 203 is not provided on the second wall portion 221, the paper P is opposed to the second wall portion 221 of the paper P while properly holding the paper P from both sides. The ink used for printing the second recording surface can be prevented from adhering to the second wall portion 221.

  (3) In the printer 100, the first inner surface 212b of the first wall portion 211 that curves relatively on the outside is a curved surface, while the second wall portion 221 that curves relatively on the inside facing the first inner surface 212b. The second inner surface 222b is constituted by a plane 222c that is continuous in a plurality of bent shapes. For this reason, it is possible to reduce the possibility that the double-side printed paper P is brought into contact with the inner surface of the curved path 151a when being conveyed through the curved path 151a.

  (4) In the printer 100, the spur roller 203 is attached to the joint portion 222d of the plurality of flat surfaces 222c where the first wall portion 211 and the second wall portion 221 are closest to each other in the second wall portion 221. Therefore, the occurrence of poor conveyance of the paper P near the joint portion 222d is reduced.

  (5) In the printer 100, since the spur rollers 203 are not opposed to each other, there is no possibility that the spur roller 203 is pressed from both one side and the other side of the paper P and the paper P is bent.

  (6) The paper P conveyed through the curved path 151a is likely to bulge outward due to the tension of the paper P. For this reason, the portion of the first inner surface 212b of the first wall 211 that curves relatively outwardly in the curved path 151a is in contact with the end portion of the paper P depending on the type and state of the paper P. The printer 100 includes a portion in which the spur rollers 203 are arranged so as to be different from each other in the first wall portion 211 that is curved relatively outward in the curved path 151a. The spur rollers 203 can be densely provided in the transport direction X. For this reason, the end portion of the sheet P bulging outward and the spur roller 203 are easily brought into contact with each other, and the sheet P can be suitably conveyed.

  (7) In the printer 100, since the second wall portion 221 is made of a resin material, the bearing 224 for attaching the spur roller 203 can be integrally formed. For this reason, the spur roller 203 can be densely provided in the direction orthogonal to the conveyance direction X of the paper P, as compared with a configuration in which the bearing 224 is formed separately and attached to the second wall portion 221. That is, the number of spur rollers 203 constituting one spur roller row N can be increased. For this reason, the contact pressure generated between one spur roller 203 and the paper P can be reduced. For this reason, it is possible to suppress the sheet P from being bent or damaged by the spur roller 203.

  In addition, since the second wall portion 221 includes a resin material, it is possible to contribute to weight reduction of the second unit 220. For this reason, the burden on the user when the second unit 220 is rotated around the axis 201 can be reduced.

  (8) The first unit 210 is pulled out from the housing 101 while supporting the second unit 220 and the third unit 230. For this reason, the one where the rigidity of the 1st unit 210 is higher is preferable. In the printer 100, since the first wall portion 211 includes a metal material, the rigidity of the first wall portion 211 can be increased.

  (9) Since the printer 100 is provided with the driving roller 202 on the first wall portion 211 that does not face the second recording surface of the paper P, ink or the like is suppressed from adhering to the driving roller 202.

In addition, you may change the said embodiment into another embodiment as follows.
In the above embodiment, the spur roller 203 of the curved portion 211b of the first wall portion 211 can be omitted. Also in this case, since the spur roller 203 is provided on the first wall portion 211 of the common discharge path 154 formed between the flat surface 212a and the flat surface 222a of the discharge path 150, the path is soiled in this portion. It can suppress adhering. In addition, as long as it is a conveyance path that conveys the double-side printed paper P, the spur roller 203 is provided on the first wall portion facing the first recording surface of the double-side printed paper P in any conveyance path. It is possible to prevent the dirt from adhering to the path by providing.

  In the above embodiment, the spur roller 203 on the flat surface portion 211 a of the first wall portion 211 in the discharge path 150 can be omitted. Also in this case, in the curved path 151a of the discharge path 150, it is possible to suppress the dirt from adhering to the path.

  In the above embodiment, the spur roller 203 provided on the first wall portion 211 can be omitted. Also in this case, since the first inner surface 212b of the curved path 151a includes a curved surface and the second inner surface 222b includes the flat surface 222c, it is possible to prevent the entire curved path 151a from being excessively narrow, and the curved path 151a is contaminated. Can be suppressed.

In the above-described embodiment, the spur roller 203 provided on the second wall portion 221 may be provided at a position shifted from the plurality of planar joining portions 222d.
In the above embodiment, the spur rollers 203 provided on the first wall portion 211 may be arranged along the transport direction X. In this case, the spur roller 203 provided on the first wall portion 211 does not include an alternate portion in the adjacent spur roller row M.

  -In the said embodiment, the 1st wall part 211 can also be made to contain a resin material. In this case, the bearing of the spur roller 203 provided on the first wall portion 211 can be formed integrally with the first wall portion 211.

  In the above embodiment, the second wall portion 221 can include a metal material. Specifically, the curved portion 221b is formed of a plate-shaped metal material. In this case, the bearing of the spur roller 203 provided in the bending portion 221b is formed separately from the bending portion 221b and attached to the bending portion 221b.

  In the above embodiment, the driving roller 202 can be provided on the second wall portion 221. In addition, the driving roller 202 can be provided on each of the first wall portion 211 and the second wall portion 221.

  In the above-described embodiment, when the recording unit 110 performs recording on the paper P, the recording unit 110 is not limited to the configuration that supports the paper P with the outer peripheral surface of the belt 135 included in the belt conveyance unit 132 as a support surface. A configuration in which the sheet P is supported by using a surface on the upper side in the vertical direction Z of the support table as a support surface may be employed.

In the above-described embodiment, the transport unit 130 that transports the paper P along the transport path 120 is not limited to the transport roller pair 131 and may be configured by, for example, a conveyor.
In the above embodiment, the recording head 111 included in the recording unit 110 is not limited to the line head type, but may be a serial head type that can move along the width direction intersecting the conveyance direction X of the paper P.

  In the above-described embodiment, the printing apparatus ejects or discharges fluid other than ink (liquid, liquid material in which particles of functional material are dispersed or mixed in the liquid, or fluid such as gel). Alternatively, a fluid ejecting apparatus that performs recording may be used. For example, recording is performed by ejecting a liquid material in which 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 is dispersed or dissolved. 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 of only gas, and examples of the fluid include liquid (inorganic solvent, organic solvent, solution, liquid resin, liquid metal (metal melt), etc. ), Liquids, fluids, and the like.

  DESCRIPTION OF SYMBOLS 100 ... Printer (printing apparatus), 150 ... Discharge path | route, 151a ... Curve path, 156 ... Mounting stand (paper discharge part), 202 ... Drive roller, 203 ... Spur roller, 211 ... 1st wall part, 211a ... Plane part 211b ... curved portion, 212a ... flat surface, 212b ... first inner surface, 221 ... second wall portion, 221a ... flat surface portion, 221b ... curved portion, 222a ... flat surface, 222b ... second inner surface, 222c ... flat surface, 222d: bonding portion, P: paper (medium), X: transport direction, Y: front-rear direction (direction orthogonal to the transport direction).

Claims (10)

A printing device capable of duplex printing on a medium,
A curved path for conveying the medium printed on both sides in a curved manner so that the surface printed immediately before of both sides of the medium is inside;
A plurality of spur rollers arranged to rotate in contact with the medium in the curved path;
The curved path is opposed to the first printed surface of both sides of the medium, and is opposed to a first wall portion that is curved relatively outward, and a surface printed immediately before of both surfaces of the medium. A second wall that curves relatively inwardly,
At least a part of the plurality of spur rollers is provided on the first wall portion. The printing apparatus according to claim 1, wherein the spur roller is provided on each of the first wall portion and the second wall portion. The first wall portion is configured by a curved first surface of the first surface facing the previously printed surface of both sides of the medium, while the second wall portion is positioned immediately before the both surfaces of the medium. The printing apparatus according to claim 1, wherein the second inner surface that faces the surface printed on is formed by a plurality of bent flat surfaces. A printing device capable of duplex printing on a medium,
A transport path for transporting the medium printed on both sides;
A plurality of spur rollers arranged to rotate in contact with the medium in the transport path;
The transport path includes a first wall portion that faces a previously printed surface of both surfaces of the medium, and a second wall portion that faces a previously printed surface of both surfaces of the medium. And
The plurality of spur rollers are provided on each of the first wall portion and the second wall portion. The transport path includes a curved path for curving and transporting the medium printed on both sides of the medium in such a manner that the surface printed immediately before of the both surfaces of the medium is inside,
The first wall portion has a first inner surface that curves relatively outward in the curved path,
The printing apparatus according to claim 4, wherein the second wall portion has a second inner surface that curves relatively inward in the curved path. The second wall portion is curved by a plurality of planes being bent continuously,
The printing apparatus according to claim 2, wherein the spur roller provided on the second wall portion is arranged side by side in a direction orthogonal to a conveyance direction of the medium at a joint portion of the plurality of planes. The printing apparatus according to claim 2, 4, 5, or 6, wherein the spur roller provided on the first wall portion and the spur roller disposed on the second wall portion do not face each other. The spur roller provided on the first wall is arranged in a plurality of rows in a direction orthogonal to the conveyance direction of the medium,
The printing apparatus according to claim 1, wherein the spur rollers in rows adjacent to each other in the medium transport direction include portions in which the arrangement in a direction orthogonal to the transport direction is staggered. The first wall includes a metal material;
The printing apparatus according to claim 1, wherein the second wall portion includes a resin material. The printing apparatus as described in any one of Claims 1-9 provided with the drive roller provided in a said 1st wall part.

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