JP2006095977A - Medium transferring device and recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medium transferring device which can precisely transfer a medium, and to provide a recorder equipped with the medium transferring device. <P>SOLUTION: A bending part 52 for bending the medium is set at a medium transfer face 51. A plurality of ribs 53 and 54 are set at transfer upstream and downstream sides via the bending part, respectively. An arrangement pitch of the ribs at the transfer upstream side and an arrangement pitch of the ribs at the transfer downstream side are made to be mutually opposite phases. The medium can be folded at the bending part. Therefore, the propagation of cockling from the transfer lower stream side than the bending part to the transfer upper stream side than the bending part can be blocked. At the same time, cockling generated at the medium of the transfer upper stream side than the bending part, and cockling of a phase opposite to a phase of the cockling which grows at the transfer lower stream side than the bending part can be absorbed between the ribs, so that floating of the medium can be prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a medium conveying apparatus that conveys a medium, a recording apparatus including the medium conveying apparatus, and a liquid ejecting apparatus.

  In an ink jet printer provided with a paper transport device, for example, when an image in which a large number of ink particles are ejected, such as a solid image on a paper, is recorded, the paper absorbs a large amount of ink and swells in a wave shape. So-called cockling may occur. When this cockling occurs, the paper floats up and the interval between the paper and the recording head becomes narrow, and the flying distance of the ink particles varies, resulting in uneven recording, or the paper comes into contact with the recording head and becomes dirty. there were.

  In view of this, an ink jet printer has been proposed in which a plurality of ribs are formed in a direction perpendicular to the sheet conveyance direction on the sheet conveyance surface. According to the ink jet printer having such a configuration, since cockling can be absorbed between the ribs, the paper can be prevented from being lifted and the paper can be bent along the rib row. Propagation of the cock ring growing on the downstream side to the conveyance upstream side can be blocked (see Patent Document 1).

Japanese Patent Laid-Open No. 7-256955

  The conventional ink jet printer described above can prevent the cockling growing on the downstream side of the conveyance from propagating to the upstream side of the conveyance. However, since the sheet on the downstream side of the conveyance floats on the flat sheet conveyance surface due to the cockling that grows on the downstream side of the conveyance, the sheet on the upstream side of the conveyance may also rise following the lift. In such a case, the interval between the paper and the recording head is narrowed, and the flying distance of the ink particles varies, resulting in recording unevenness, or the paper is in contact with the recording head and becomes dirty.

  The present invention has been made in view of the various problems as described above, and an object of the present invention is to provide a medium conveying apparatus capable of conveying a medium with high accuracy, a recording apparatus including the medium conveying apparatus, and a liquid ejecting apparatus. It is to provide.

  In order to achieve the above object, the medium conveying apparatus of the present invention is a medium conveying apparatus that conveys a medium while sucking the medium, and is provided with a bent portion that bends the medium on a medium conveying surface and sandwiches the bent portion. A plurality of ribs are provided on the downstream side, and a plurality of ribs in which the arrangement pitch of the ribs on the upstream side of conveyance and the arrangement pitch of the ribs on the downstream side of conveyance are opposite to each other are provided. As a result, the medium can be bent at the bent portion, so that the propagation of the cock ring from the downstream side of the conveyance from the bent portion to the upstream side of the conveyance from the bent portion can be blocked, and the medium upstream of the bent portion can be conveyed. The generated cockling and the cockling in the opposite phase to the phase of the cockling growing on the downstream side of the conveyance from the bent portion can be absorbed between the ribs, so that the medium can be prevented from rising.

  Further, the upper surface of the rib is provided such that a difference in height from the medium conveying surface is approximately the amplitude of a wave-like bulge generated in the medium. Thereby, cockling generated in the medium can be completely absorbed by the rib and the medium transport surface. Further, a suction hole for sucking the medium is provided on either one or both of the upper surface of the rib and the medium transport surface. Thereby, cockling generated in the medium can be reliably absorbed by the rib and the medium transport surface.

  In order to achieve the above object, the recording apparatus of the present invention is a recording apparatus for recording on a medium, and is characterized by including each of the medium conveying apparatuses. The liquid ejecting apparatus of the present invention is a liquid ejecting apparatus that ejects a liquid onto a medium to be ejected, and is characterized by including each of the medium conveying apparatuses. Thereby, it is possible to provide a recording apparatus and a liquid ejecting apparatus that exhibit the above-described effects.

  FIG. 1 and FIG. 2 are perspective views of an external configuration example of an ink jet printer that is one of recording apparatuses provided with a sheet conveying device according to an embodiment of the present invention, and FIG. The perspective view seen from the back side, FIG. 4 is a perspective view which shows the internal structure. The ink jet printer 100 is a large printer capable of recording up to a relatively large size cut paper such as JIS standard A0 size or JIS standard B0 size and roll paper R having the paper width. As shown in FIGS. 1 to 4, the ink jet printer 100 includes a rectangular parallelepiped printer body 110 and printer legs 120 that support the printer body 110.

  The printer main body 110 is divided into upper and lower layers as shown in FIGS. 1 to 4, and a roll paper storage portion 130 is disposed at the boundary between the upper and lower layers on the back side as shown in FIG. ing. As shown in FIGS. 1 to 4, a paper supply / discharge unit 140 and a recording unit 150 including a characteristic part of the present invention are disposed in the upper layer. Further, as shown in FIGS. 1 to 4, a sheet suction unit 160 is disposed at the center of the lower layer, and an ink supply unit 170 is disposed on the left side of the lower layer when viewed from the front side. A head characteristic recovery unit 180 and a drive control unit 190 are arranged vertically on the right side of the lower layer. As shown in FIGS. 1 to 4, a waste ink collection unit 200 is disposed below the drive control unit 190 and beside the printer leg 120.

  As shown in FIGS. 1 to 3, the printer main body 110 includes an upper housing 111 made of plastic or sheet metal that covers the paper supply / discharge unit 140 and the recording unit 150, a paper suction unit 160, an ink supply unit 170, and head characteristics recovery. A lower housing 112 made of plastic or sheet metal that covers the part 180 and the drive control part 190 is provided. As shown in FIG. 2, the upper housing 111 is provided with a body cover 113 made of plastic or sheet metal so as to be openable from the center front surface to the center upper surface. In addition, as shown in FIG. 2, the lower housing 112 is provided with an ink cover 114 made of plastic or sheet metal so that the front surface of the ink supply unit 170 can be opened.

  As shown in FIGS. 1 and 2, the main body cover 113 is supported so that the rear portion is rotatable with respect to the upper housing 111, and the user puts his / her finger into a recessed finger-hanging portion 113 a formed on the front surface. It opens and closes by being pushed up or pushed down. The user can open the main body cover 113 to largely open the upper part of the paper supply / discharge unit 140 and the recording unit 150, so that the maintenance operation of the recording head 152, the carriage 153, etc., the paper jam during recording or transporting, etc. It is possible to easily perform the operation of canceling the paper conveyance error. Further, as shown in FIGS. 1 and 3, the main body cover 113 is provided with a window 113b made of transparent or translucent plastic on a part of its upper surface. The user can visually recognize the recording state and the conveyance state by looking inside the window 113b without opening the main body cover 113.

  As shown in FIGS. 1 and 2, the ink cover 114 is supported so that both sides thereof are slidable with respect to the lower housing 112, and the user puts his / her finger into a recessed finger-hanging portion 114 a formed on the front surface. It opens and closes by being pushed up or pushed down. Since the user can open the front surface of the ink supply unit 170 by opening the ink cover 114, the user can easily replace the ink cartridge 10 or the like. Further, as shown in FIGS. 1 and 2, the ink cover 114 is provided with a window 114b made of a transparent or translucent plastic at a part of the front surface. The user can view the state of the ink cartridge 10 by looking through the window 114b without opening the ink cover 114.

  Further, as shown in FIGS. 1 to 3, the printer main body 110 is provided with an operation panel 115 for the user to operate recording control and the like on the upper surface of the upper right layer when viewed from the front side. . The operation panel 115 is provided with a liquid crystal screen and various buttons so that the user can operate the buttons while checking the liquid crystal screen. Since the user can perform a reliable operation by visual recognition, an operation error, an operation error, and the like can be eliminated.

  As shown in FIGS. 1 to 4, the printer leg portion 120 includes two inverted T-shaped support columns 121 and a reinforcing column 122 spanned between the support columns 121. The printer main body 110 is placed on the support column 121 and fixed with screws. Since the printer main body 110 is lifted by the printer legs 120, the user can easily perform the paper supply / discharge process and various maintenance processes. Furthermore, it becomes possible to install a paper discharge receiving portion in the space of the printer leg portion 120, so that recorded paper can be efficiently collected and contamination of the recorded paper can be prevented.

  As shown in FIG. 3, the roll paper storage unit 130 is inserted in the inner periphery of the roll paper R to support the roll paper R, and the both ends of the spindle 131 are pivotally supported. Has no bearing. The back surface of the sheet suction unit 160 is formed so as to be recessed from the back surfaces of the ink supply unit 170 and the back surfaces of the head characteristic recovery unit 180 and the drive control unit 190 on both sides of the sheet suction unit 160. 130 is disposed.

  That is, bearings (not shown) are provided on opposite sides of the ink supply unit 170, the head characteristic recovery unit 180, and the drive control unit 190 to support the spindle 131 in the main scanning direction so as to pivotally support both ends thereof. . Then, the roll paper R can be set without protruding from the back side of the printer main body 110 by bridging the spindle 131 penetrating the inner periphery of the roll paper R between these bearings.

  As shown in FIG. 4, the paper supply / discharge unit 140 includes a paper feed roller 141 and a paper feed driven roller 142. The paper feed roller 141 and the paper feed follower roller 142 are arranged so that the shaft faces the main scanning direction and the circumferential surface is up and down on the downstream side of the paper feed from the roll paper storage unit 130, that is, the rear side in the printer main body 110. It arrange | positions so that it may oppose. The paper feed roller 141 is formed as a single long roller, and the peripheral surface portion slightly larger than the maximum recordable paper width is coated with ceramic powder or the like. As a result, slippage during paper feeding can be prevented, and the paper can be fed out with high accuracy. Both ends of the paper feed roller 141 are axially supported by side frames 116 via bearings (not shown), and are driven to rotate forward and backward by a driving force transmitted from the paper feed motor 143 through the pulley 144 and the belt 145. It has become.

  The paper feed driven roller 142 is formed as a plurality of short rollers, and is pivotally supported by a plurality of driven roller support members 146 arranged in parallel in the axial direction above the paper feed roller 141. The paper feed driven roller 142 is pressed against the paper feed roller 141 by a biasing member such as a spring (not shown) attached to the driven roller support member 146, and follows the forward / reverse rotation drive of the paper feed roller 141. It is designed to rotate forward and reverse. Thus, the sheet can be firmly pressed from both sides and sent out, so that highly accurate recording can be performed. The paper feed roller 141 and the paper feed driven roller 142 sandwich the roll paper R and the cut paper fed from the paper feed port 147 formed between the upper and lower layers of the printer main body 110 shown in FIG. 2 and 4 are sent out onto the platen 151 of the recording unit 150 and discharged from a paper discharge port 148 formed between upper and lower layers of the printer main body 110 shown in FIG.

  As shown in FIGS. 2 and 4, the recording unit 150 includes a platen 151, which is a characteristic part of the present invention, arranged on the downstream side of the conveyance immediately from the paper feed roller 141, and a carriage on which the recording head 152 is mounted. 153 and a cutter 154 mounted on the carriage 153. Further, the recording unit 150 includes a flexible flat cable (hereinafter referred to as FFC) (not shown) that electrically connects the recording head 152 and a drive control unit 190 for executing recording, an ink cartridge containing the recording head 151 and ink. And an ink tube (not shown) that connects to the printer 10.

  The platen 151 is formed in a rectangular flat plate shape having a length slightly larger than the maximum recordable paper width, and is disposed along the paper feed roller 141. The platen 151 is bent in the conveyance direction in the middle of the paper conveyance surface 51 (see FIG. 5 and the like), and the cockling of the paper caused by moisture absorption on both sides of the bent portion 52 (see FIG. 5 and the like). A plurality of ribs 53 and 54 (see FIG. 5 and the like) that absorbs water are formed in a staggered pattern. A plurality of suction holes 55 (see FIG. 5 and the like) connected to the paper suction unit 160 are formed from the front side to the back side of the paper transport surface 51 and the ribs 53 and 54. As a result, the paper being recorded can be held in a substantially flat shape, so that highly accurate recording can be performed. Details of the platen 151 will be described later.

  The recording head 152 is disposed at a lower portion of the carriage 153 so as to face the cut paper or the roll paper R supplied to the upper surface of the platen 151 with a predetermined interval, and ejects two types of black ink. And a plurality of color ink recording heads for ejecting ink of each color such as cyan, magenta, yellow, red, blue, and gloss optimizer. The recording head 152 is provided with a pressure generating chamber and a nozzle opening connected to the pressure generating chamber, and a cut supplied to the upper surface of the platen 151 from the nozzle opening by storing ink in the pressure generating chamber and pressurizing it with a predetermined pressure. Controlled ink droplets are ejected toward the paper or roll paper R.

  The carriage 153 is placed on a carriage guide shaft 155 provided in the main scanning direction via a bearing (not shown), and is coupled to the belt 156. When the pulley 157 is rotated by a carriage motor (not shown) and the belt 156 is rotated, the carriage 153 is entrained by the movement of the belt 156 and guided by the carriage guide shaft 155 to reciprocate in the main scanning direction. ing. As a result, the carriage 153 can be moved with high accuracy, so that highly accurate recording can be performed.

  The cutter 154 is disposed so as to be movable up and down in the vertical direction and movable in the main scanning direction so that the blade edge faces downward. The cutter 154 is moved up and down by, for example, a solenoid and moved in the main scanning direction together with the carriage 153. Therefore, it is not necessary to separately provide a means for moving the cutter 154, so that space can be saved and cost can be reduced. The cutter 154 may be separated from the carriage 153 and moved in the main scanning direction by a unique belt mechanism or a motor.

  The FFC has one end connected to the connector of the drive control unit 190 and the other end connected to the connector of the recording head 152, and sends a recording signal from the drive control unit 190 to the recording head 152. The ink tubes are provided for the inks of the respective colors, and one end of each ink tube is connected to the corresponding ink cartridge 10 via an ink pressurizing and supplying means (not shown), and the other end of each color recording head. 152 is connected. The ink tube is configured to send ink of each color pressurized by the ink pressure supply means from the ink cartridge 10 to the recording head 152.

  As shown in FIG. 4, the sheet suction unit 160 includes a pressure chamber 161 disposed in the lower part of the platen 151 and a fan (not shown) disposed in the lower part of the pressure chamber 161. The pressure chamber 161 is formed in a box shape in which a part of the upper surface and the bottom surface is opened, a platen 151 is attached to the open portion of the upper surface, and a fan is attached to the open portion of the bottom surface. By rotating the fan, the air is sucked into the pressure chamber 161 from the suction hole 55 formed in the platen 151, and exhausted to the outside through the fan. Therefore, when cut paper or roll paper R is supplied to the upper surface of the platen 151, negative pressure is generated on the lower surface side of the cut paper or roll paper R, so that the cut paper or roll paper R is attracted to the upper surface of the platen 151. As a result, the cut paper or the roll paper R can be prevented from being lifted, and the recording accuracy can be maintained with high accuracy.

  As shown in FIG. 4, the ink supply unit 170 includes a box-shaped cartridge storage unit 171 and a cartridge pressing unit 172 attached to the front side of the cartridge storage unit 171. The cartridge storage portion 171 is partitioned so that two types of ink cartridges 10 of a total of eight colors, black, cyan, magenta, yellow, red, blue, and gloss optimizer, can be pulled out from the front side and pushed in sequentially from the left side of the figure. ing. The cartridge pressing portion 172 is attached to each partition portion of the cartridge storage portion 171 so as to be freely opened and closed. The cartridge pressing portion 172 presses the ink cartridge 10 in the partition portion in conjunction with the closing operation, and ink cartridges in the partition portion in conjunction with the opening operation. 10 is popping out.

  Here, the ink cartridge 10 is hermetically sealed, for example, in an outer case formed in a rectangular parallelepiped shape with a hard plastic material, for example, in a bag shape made of a flexible material and filled with ink inside. . An ink supply port connected to the ink tank and a positioning hole in the cartridge housing portion 171 are formed on the surface on the insertion side to the cartridge housing portion 171. On the other hand, an ink supply needle inserted into the ink supply port of the ink cartridge 10 and a positioning needle inserted into the positioning hole of the ink cartridge 10 are pulled out and pushed in the ink cartridge 10 on the inner rear surface of the cartridge housing portion 171. It is arrange | positioned so that it may protrude.

  Therefore, the ink cartridge 10 accommodated in the cartridge accommodating portion 171 is automatically positioned when the positioning needle is inserted into the positioning hole when the cartridge pressing portion 172 is closed. The ink can be supplied to the recording head 152 by entering the ink supply port. When the cartridge pressing portion 172 is opened, the positioning needle is automatically extracted from the positioning hole, and at the same time, the ink supply needle is automatically extracted from the ink supply port.

  The head characteristic recovery unit 180 is disposed below the carriage 153 located at the home position shown in FIG. 4, and includes wiping means, capping means, suction means, and drive means for these. The wiping means includes a wiper formed in a substantially rectangular flat plate shape using rubber, felt, plastic, or the like, and rubs against the nozzle forming surface of the recording head 152 so as to wipe off ink adhering to the nozzle forming surface. It has become.

  The capping means is provided with a cap formed in a substantially rectangular parallelepiped shape by rubber, and a recess provided in the upper part is pressed against the nozzle forming surface of the recording head 152 to seal the nozzle opening. The suction means forcibly sucks and discharges the ink in order to remove clogged nozzle openings and mixed bubbles. Therefore, it is possible to perform processing for maintaining the ink ejection characteristics of the recording head 152 in a constant state when the carriage 153 is in the home position.

  The waste ink collection unit 200 includes a detachable waste liquid cartridge 201. The waste liquid cartridge 201 stores waste liquid such as ink used when initially filling the ink supply system reaching the recording head 152 or cleaning liquid used when cleaning the ink supply system reaching the recording head 152. It has become. Thus, since the waste liquid processing can be completed only by replacing the waste liquid cartridge 201, the number of work steps can be reduced, and contamination of the peripheral portion of the printer can be prevented.

  FIG. 5 is a perspective view showing a platen 151 showing the characteristic part of the present invention and its peripheral part, and FIG. 6 is a side view thereof. The platen 151 is formed in a rectangular flat plate shape and is disposed in the immediate vicinity of the conveyance downstream side of the paper feed roller 141. A part of the sheet conveying surface 51 of the platen 151 is bent in the conveying direction, and a plurality of rail-like ribs 53 (hereinafter referred to as upstream ribs 53) and ribs 54 (hereinafter referred to as downstream) are sandwiched between the bent portions 52. Side ribs 54). The upstream ribs 53 and the downstream ribs 54 are arranged in a row at predetermined intervals in the main scanning direction, and the upstream ribs 53 and the downstream ribs 54 are arranged in a staggered pattern in the sub scanning direction. A plurality of suction holes 55 are formed in the sheet conveying surface 51 between the upstream rib 53 and the downstream rib 54 and the upper surfaces 53 a and 54 a of the upstream rib 53 and the downstream rib 54.

  Here, the sheet conveyance surface 51 including the downstream rib 54 on the downstream side from the bent portion 52 is formed to be inclined downward at an angle of several degrees. Further, the upper surfaces 53a and 54a of the upstream rib 53 and the downstream rib 54 are provided such that the height difference from the sheet conveying surface 51 is about the amplitude of cockling. Further, the upstream rib 53 and the downstream rib 54 are arranged so that the arrangement pitch is substantially the same as the pitch of the cock ring generated on the paper. The upstream rib 53 and the downstream rib 54 are disposed so as to have opposite phases with respect to the bent portion 52.

  By providing the bent portion 52 having the above-described configuration, the paper on which cockling has occurred can be bent at the bent portion 52. For this reason, since the stress generated in the paper can be divided by the bent portion 52, the reverse flow of the cock ring can be dammed by the bent portion 52, and the cock ring is greatly attracted to other portions. The situation can be surely prevented.

  Further, when the paper in which cockling has occurred is bent with high accuracy at the bent portion 52, the peaks and valleys of the cockling, that is, the phase is reversed before and after the bent portion 52. However, the height difference between the upstream rib 53 and the downstream rib 54, that is, the sheet conveyance surface 51 is set to be about the amplitude of the cockling, and the arrangement pitch is substantially the same as the cockling pitch. Further, the upstream rib 53 and the downstream rib 54 are arranged in a staggered manner with respect to the bent portion 52, that is, in an opposite phase to each other, and further between the upstream rib 53 and the downstream rib 54. A plurality of suction holes 55 formed in the upper surfaces 53a, 54a of the sheet conveying surface 51 and the upstream ribs 53 and the downstream ribs 54 can completely absorb cocklings of opposite phases generated in the sheets. .

  As a result, the distance between the paper and the recording head 152 can be kept constant, and recording unevenness due to variations in the flying distance of ink particles and contamination due to contact of the paper with the recording head 152 can be prevented and recording can be performed with high accuracy. The state can be maintained. In the above-described embodiment, the plurality of suction holes 55 are formed in the sheet conveying surface 51 between the upstream rib 53 and the downstream rib 54 and the upper surfaces 53a and 54a of the upstream rib 53 and the downstream rib 54. However, the suction hole 55 may be formed in either one of them.

  As described above, according to the ink jet printer 100 of the present embodiment, the bent portion 52 that bends the sheet is provided on the sheet conveying surface 51, and a plurality of phases that are opposite in phase to each other on the upstream and downstream sides of the bent portion 52. Since the upstream rib 53 and the downstream rib 54 are provided, the sheet can be bent at the bent portion 52 and the propagation of the cock ring from the bent portion 52 to the upstream side of the conveyance from the bent portion 52 can be blocked. Can do. Furthermore, the cockling generated on the sheet upstream of the bent portion 52 and the cockling that is in the opposite phase to the phase of the cockling grown on the downstream side of the bent portion 52 are connected to the upstream rib 53 and the downstream rib 54. The sheet can be prevented from being lifted up.

  Any recording apparatus provided with a medium conveying apparatus can be applied to, for example, a facsimile apparatus and a copying apparatus. In addition to a recording apparatus, the meaning of a liquid ejecting apparatus that ejects a liquid corresponding to its use from a liquid ejecting head onto an ejected medium instead of ink and attaches the liquid to the ejected medium is, for example, a liquid crystal display or the like Color material jet head used for manufacturing color filters, electrode material (conductive paste) jet head used for electrode formation for organic EL display and surface emitting display (FED), bio-organic jet head used for biochip manufacturing, precision pipette The present invention can also be applied to an apparatus equipped with a sample ejection head or the like.

1 is a first perspective view of an external configuration example of an ink jet printer that is one of recording apparatuses including a paper transport device according to an embodiment of the present invention as viewed from the front side. FIG. 3 is a second perspective view of an external configuration example of the printer of FIG. 1 viewed from the front side. It is the perspective view which looked at the printer of FIG. 1 from the back side. FIG. 2 is a perspective view showing an internal structure of the printer of FIG. 1. It is a perspective view which shows the platen which shows the characteristic part of this invention, and its peripheral part. FIG. 6 is a side view of FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ink cartridge, 51 Paper conveyance surface, 52 Bending part, 53 Upstream rib, 54 Downstream rib, 55 Suction hole, 100 Inkjet printer, 110 Printer main-body part, 111 Upper housing, 112 Lower housing, 113 Main body cover, 114 Ink cover, 115 Operation panel, 120 Printer leg part, 130 Roll paper storage part, 140 Feed / discharge part, 141 Paper feed roller, 142 Paper feed driven roller, 143 Paper feed motor, 150 Recording part, 151 Platen, 152 Recording head , 153 carriage, 154 cutter, 155 carriage guide shaft, 156 belt, 157 pulley, 158 paper guide, 160 paper suction unit, 170 ink supply unit, 171 cartridge storage unit, 172 cartridge holding unit, 180 head characteristic recovery unit, 90 drive control unit, 200 the waste ink recovery unit

Claims (5)

A medium conveying device that conveys a medium while sucking the medium,
A bent portion for bending the medium is provided on the medium conveying surface, and a plurality of ribs are provided on the upstream and downstream sides of the conveyance with the bent portion interposed therebetween. The arrangement pitch of the ribs on the upstream side of the conveyance and the arrangement of the ribs on the downstream side of the conveyance are provided. A medium transporting apparatus comprising a plurality of ribs whose installation pitches are opposite in phase to each other. 2. The medium conveying apparatus according to claim 1, wherein an upper surface of the rib is provided so that a difference in height from the medium conveying surface is about an amplitude of a wave-like bulge generated in the medium. The medium conveying apparatus according to claim 1, wherein a suction hole for sucking the medium is provided on one or both of the upper surface of the rib and the medium conveying surface. A recording device for recording on a medium,
A recording apparatus comprising the medium conveyance device according to claim 1. A liquid ejecting apparatus that ejects liquid onto an ejection target medium,
A liquid ejecting apparatus comprising the medium conveying device according to claim 1.

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