JP2006095976A - Medium transferring device and recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medium transferring device which can suppress effects onto the transfer at the time of cutting of a medium, and to provide a recorder equipped with the medium transferring device. <P>SOLUTION: A plurality of ribs 44 and 45 are set at transfer upstream and downstream sides via a travel face so that the travel face of a cutting means 154 becomes lower than a transfer route of the medium. The medium can be cut while cockling generated at the medium is maintained by the ribs. Such situation that the cockling greatly falls on the other part can be prevented accordingly. <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.

  2. Related Art Some ink jet printers that are one of recording apparatuses include a paper transport device that transports roll paper that is one of media. The paper transport device includes a cutter held by a cutter holder that cuts roll paper. In such a configuration, when cutting the roll paper, the roll paper is sandwiched between the front end surface of the cutter holder and the cutter guide, and the cutter holder is moved in the conveyance orthogonal direction.

  However, when the roll paper is cut, the cut portion is curled because the restraining force is lost, but the uncut portion is still in the restrained state, so the curling force of the cut portion with respect to the cutter position is the starting point. The cutter holder may be pushed up by acting on the tip surface of the cutter holder. In such a case, the cutter may not cut into the roll paper properly, resulting in a cutting failure. Therefore, an ink jet printer has been proposed in which a chamfer is formed on the front end surface of the cutter holder so as to release the curling force (see Patent Document 1).

JP 2000-158738 A

  In the above-described ink jet printer, when an image in which a large number of ink particles are ejected, such as a solid image on a roll paper, is recorded, the roll paper absorbs a large amount of ink and swells in a wavy shape. A ring may occur. The roll paper in a state where the cockling has occurred is also sandwiched and cut between the front end surface of the cutter holder and the cutter guide. At that time, the roll paper is spread flat, so that the cock ring has other parts. It will be greatly crowded. For example, when the gathered portion is a recording portion, the roll paper is lifted and the interval between the roll paper and the recording head is narrowed. When the roll paper is conveyed, the roll paper comes into contact with the recording head and becomes dirty. There was a bug.

  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 suppressing the influence on the conveyance when the medium is cut, a recording apparatus including the medium conveying apparatus, and a liquid. It is in providing an injection device.

  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 includes cutting means that travels in a direction perpendicular to the medium to cut the medium. A plurality of ribs are provided on the transport upstream and downstream sides of the travel surface so that the travel surface of the cutting means is lower than the transport path of the medium. As a result, the medium can be cut while the cockling generated in the medium is maintained by the ribs, so that it is possible to prevent a situation in which the cockling is largely pulled toward other parts.

  Further, the upper surface of the rib is provided so that the height difference from the running surface is about the amplitude of a wavy bulge generated in the medium. Thus, even when the medium is cut between the cutting means and the running surface, the cockling generated in the medium can be received and maintained by the rib. In addition, a bent portion is provided in the rib on the upstream side of conveyance. Thereby, since the medium in which cockling has occurred can be bent at the bent portion, it is possible to effectively prevent the reverse flow of the cockling. A step portion is provided in the rib on the upstream side of conveyance. As a result, even if the curl is generated at the leading end of the medium, the curled portion can be escaped by the stepped portion, so that it is possible to prevent a cutting failure or a conveyance failure of the medium. The medium is sucked by the rib forming surface on the upstream and downstream sides of the conveyance. As a result, cockling generated in the medium can be reliably absorbed by the rib and its formation 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 attached to 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 provided with a plurality of suction holes 42 (see FIG. 5 and the like) connected to the paper suction unit 160 from the front surface to the back surface of the paper transport surface 41 (see FIG. 5 and the like). A plurality of ribs 44 and 45 (see FIG. 5 and the like) are formed on both sides of the cutter groove 43 (see FIG. 5 and the like) to absorb paper cockling and the like caused by moisture absorption. 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 below the platen 151 and the paper guide 158, and a fan (not shown) disposed below 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 52 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 plurality of rail-like ribs 44 (hereinafter referred to as upstream ribs 44) and ribs 45 (hereinafter referred to as downstream ribs 45) are disposed on both sides of the cutter groove 43 on the sheet conveying surface 41 of the platen 151. ing. The upstream ribs 44 and the downstream ribs 45 are arranged in a row at predetermined intervals in the main scanning direction, and the upstream ribs 44 and the downstream ribs 45 are arranged so as to be linear in the sub scanning direction. Has been. A plurality of suction holes 42 penetrating the paper conveyance surface 41 between the upstream ribs 44 and the downstream ribs 45 are formed.

  Here, the edge 43 a of the cutter groove 43 on the sheet conveying surface 41 of the platen 151 is provided to be lower than the upper surfaces 44 a and 45 a of the upstream rib 44 and the downstream rib 45. That is, the traveling surface of the cutter 154 is provided so as to be lower than the sheet conveyance path. Further, the upstream rib 44 and the downstream rib 45 are arranged so that the arrangement pitch is substantially the same as the pitch of the cock ring generated on the paper. The upper surfaces 44a and 45a of the upstream rib 44 and the downstream rib 45 are provided such that the height difference from the traveling surface of the cutter 154 is about the amplitude of the cockling.

  The upstream ribs 44 and the downstream ribs 45 having the above-described configuration, that is, the arrangement pitch is arranged so as to be substantially the same as the pitch of the cock ring, and the height difference from the running surface of the cutter 154 is the amplitude of the cock ring. The cockling generated in the sheet can be maintained by the upstream ribs 44 and the downstream ribs 45 provided so as to be approximately equal to each other. Therefore, even when the paper is cut between the cutter 154 and the traveling surface of the cutter 154, the clamping portion is supported by the downstream end of the upstream rib 44 and the upstream end of the downstream rib 45. Since the gap is generated and the sheet can be cut while maintaining the cockling generated in the sheet, it is possible to prevent a situation in which the cockling is largely gathered to other parts. 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.

  7A and 7B are side views showing modifications of the platen 151, respectively. The platen 151 shown in FIG. 7A is bent in the middle of the sheet conveyance surface 41 including the upstream ribs 44, and the upstream ribs 44, the cutter grooves 43, and the downstream ribs 45 on the downstream side from the bent portion 46. Is formed with an inclination. By providing such a bent portion 46, the paper on which cockling has occurred can be bent at the bent portion 46, so that the reverse flow of the cock ring can be blocked by the bent portion 46, and the cock ring can be moved to other portions. It is possible to more reliably prevent a situation where a large amount of wrinkles occur.

  A platen 151 shown in FIG. 7B is provided with a stepped portion 47 higher in the upstream side than in the downstream side in the middle of the upstream side rib 44. By providing such a stepped portion 47, the curl generated at the leading edge of the paper can be released by the stepped portion 47, so that the leading edge of the paper can be prevented from being bent, and the recorded paper can be continuously fed. It can be cut and transported with high accuracy.

  FIG. 8 is a perspective view showing another embodiment of the platen 151 and its peripheral portion, FIG. 9A is a plan view thereof, and FIG. 8B is a cross-sectional view taken along line AA thereof. This platen 151 is also formed in the shape of a rectangular flat plate and is disposed in the immediate vicinity of the conveyance downstream side of the paper feed roller 141. Further, a paper guide 158 is formed in the shape of a rectangular flat plate and is downstream of the conveyance of the platen 151. Are integrally disposed. The paper guide 158 is disposed so as to be lower than the platen 151 by a predetermined height.

  In the platen 151, a plurality of rectangular suction grooves 53 are arranged in a row at predetermined intervals in the main scanning direction of the paper transport surface 51. The suction groove 53 is formed in an inverted quadrangular truncated pyramid surrounded by side walls 53b, 53c, 53d, and 53e inclined on four sides of a flat bottom surface 53a. A plurality of suction holes 52 are formed in the bottom surface 53 a of each suction groove 53 and the top surface 54 a (paper transport surface 51) of the partition wall 54 of each suction groove 53. The suction grooves 53 of the platen 151 are arranged so that the arrangement pitch is substantially the same as the pitch of the cock ring generated on the paper. The bottom surface 53a of the suction groove 53 is provided such that the height difference from the paper transport surface 51 is about the cockling amplitude.

  In addition, a rectangular opening 55 communicating with the paper suction unit 160 is formed at the position of the paper transport surface 51 corresponding to the side edge of the paper in the platen 151. An absorbing member (not shown) is fitted in the opening 55 so as to collect ink particles removed from the edge of the paper when recording the paper without a border. The absorbent member only needs to have an appropriate air permeability. For example, a sponge, a water-absorbing polymer, a felt-like fibrous material, a nonwoven fabric, or the like is used.

  A cutter step 83 extending in the main scanning direction is formed on the paper guide surface 81 of the paper guide 158. The cutter step 83 is formed in such a size that the cutting edge of the cutter 154 protruding from the lower surface of the paper can enter so that the paper guide surface 81 is not damaged when the cutter 154 cuts the paper in the width direction. . As a result, the recorded portion and the unrecorded portion of the sheet can be reliably separated.

  Further, a plurality of rail-shaped ribs 84 (hereinafter referred to as upstream ribs 84) and ribs 85 (hereinafter referred to as downstream ribs 85) are disposed on both sides of the paper guide surface 81 with the cutter step 83 interposed therebetween. Yes. The upstream rib 84 and the downstream rib 85 are arranged in a row at predetermined intervals in the main scanning direction, and the upstream rib 84 and the downstream rib 85 are arranged in a straight line in the sub scanning direction. Has been. A plurality of suction holes 82 penetrating the paper guide surface 81 between the upstream rib 84 and the downstream rib 85 are formed.

  Here, the edge 83 a of the cutter step 83 in the paper guide surface 81 on the upstream rib 84 side of the paper guide 158 is provided to be lower than the upper surface 84 a of the upstream rib 84. That is, the traveling surface of the cutter 154 is provided so as to be lower than the sheet conveyance path. Further, the upstream ribs 84 and the downstream ribs 85 are arranged so that the arrangement pitch is substantially the same as the pitch of cockling generated on the paper. The upper surface 84a of the upstream rib 84 is provided such that the height difference from the traveling surface of the cutter 154 is about the amplitude of the cock ring, and the upper surface 85a of the downstream rib 85 is a sheet guide on the downstream rib 85 side. It is provided so that the height difference from the surface 81 is about the amplitude of cockling. In addition, a large difference in height is provided between the platen 151 and the paper guide 158.

  The upstream rib 84 and the downstream rib 85 having the above-described configuration, that is, the arrangement pitch is arranged so as to be substantially the same as the pitch of the cock ring, the height difference from the running surface of the cutter 154, and the downstream rib 85. The cockling generated in the paper can be maintained by the upstream rib 84 and the downstream rib 85 provided so that the height difference from the side paper guide surface 81 is about the amplitude of the cockling. Accordingly, even when the sheet is cut between the cutter 154 and the traveling surface of the cutter 154, the sandwiched portion is formed between the downstream end 84b of the upstream rib 84 and the downstream rib 85 as shown in FIG. Since it is supported by the upstream end portion 85b, a gap d is generated, and the paper R can be cut while maintaining the cockling generated in the paper R. Can be prevented. As a result, the distance between the paper R and the recording head 152 can be kept constant, and recording irregularities due to variations in the flying distance of ink particles and contamination due to the paper R coming into contact with the recording head 152 can be prevented with high accuracy. A good recording state can be maintained.

  Further, as shown in FIG. 10, due to the difference in height between the platen 151 and the paper guide 158, the paper R in which cockling has occurred can be bent at the downstream end 151a of the platen 151, so that the reverse flow of the cockling can be prevented. The clogging can be prevented by the downstream end portion 151a of the platen 151, and the situation where the cock ring is largely squeezed to other portions can be prevented more reliably. Further, the curl generated at the leading edge of the paper R can be released at the boundary between the platen 151 and the paper guide 158 due to the difference in height between the platen 151 and the paper guide 158, so that the leading edge of the paper R can be prevented from being bent. The recorded paper R can be continuously cut and conveyed with high accuracy.

  As described above, according to the ink jet printer 100 of the present embodiment, the upstream ribs on the upstream and downstream sides of the conveyance with the traveling surface of the cutter 154 sandwiched so that the traveling surface of the cutter 154 is lower than the conveyance path of the paper. 44, 84 and downstream ribs 45, 85 are provided, and the upper ribs 44, 84 and the upper surfaces 44a, 45a, 84a, 85a of the downstream ribs 45, 85 have a difference in height from the running surface of the cutter 154 in the paper. It is provided so as to be about the amplitude of cockling. Therefore, even when the sheet is cut between the cutter 154 and the traveling surface of the cutter 154, the cock ring generated in the sheet is received and maintained by the upstream ribs 44 and 84 and the downstream ribs 45 and 85. Since the sheet can be cut as it is, it is possible to prevent a situation in which the cock ring is largely gathered to other parts.

  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. It is a side view which shows the modification of the platen which shows the characteristic part of this invention. It is a perspective view which shows another embodiment of the platen which shows the characteristic part of this invention, and its peripheral part. It is the top view of FIG. 8, and the AA sectional view. FIG. 9 is an enlarged side view of FIG. 8.

Explanation of symbols

10 Ink cartridge, 41, 51 Paper transport surface, 42, 52, 82 Suction hole, 43 Cutter groove, 44, 84 Upstream rib, 45, 85 Downstream rib, 46 Bent part, 47 Step part, 53 Suction groove, 54 Partition wall, 55 opening, 56 upstream rib surface, 57 downstream rib surface, 81 paper guide surface, 83 cutter step, 100 ink jet printer, 110 printer main body, 111 upper housing, 112 lower housing, 113 main body cover, 114 Ink cover, 115 Operation panel, 120 Printer leg, 130 Roll paper storage, 140 Feed / discharge unit, 141 Paper feed roller, 142 Paper feed driven roller, 143 Paper feed motor, 150 Recording unit, 151 Platen, 152 Recording Head, 153 carriage, 154 cutter, 155 carriage guide shaft, 156 Belt, 157 Pulley, 158 Paper guide, 160 Paper suction part, 170 Ink supply part, 171 Cartridge storage part, 172 Cartridge pressing part, 180 Head characteristic recovery part, 190 Drive control part, 200 Waste ink collection part

Claims (7)

A medium conveying device that conveys a medium while sucking the medium,
A cutting unit that travels in a direction orthogonal to the conveyance with respect to the medium and cuts the medium is provided, and conveyance upstream and downstream with the traveling surface sandwiched so that a traveling surface of the cutting unit is lower than a conveyance path of the medium A medium conveying apparatus comprising a plurality of ribs on the side. The medium conveying apparatus according to claim 1, wherein an upper surface of the rib is provided such that a difference in height from the traveling surface is approximately an amplitude of a wave-like bulge generated in the medium. The medium conveying apparatus according to claim 1, wherein a bent portion is provided in the rib on the upstream side of conveyance. The medium conveying apparatus according to claim 1, wherein a step portion is provided on the rib on the upstream side of conveyance. The medium conveying apparatus according to claim 1, wherein the medium is sucked by a rib forming surface on the upstream and downstream sides of the conveying. A recording device for recording on a medium,
A recording apparatus comprising the medium conveying apparatus 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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