JP2007070042A - Medium conveying device, liquid spraying device, and recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To convey a medium to be conveyed with excellent accuracy by suppressing the deformation in the direction orthogonal to the conveying direction of the medium. <P>SOLUTION: Pressing means 30a, 30b are provided, which press a medium from both sides thereof by applying the force opposing in the direction orthogonal to the medium conveying direction when conveying the medium. The conveying accuracy of the medium can be maintained with high accuracy since the deformation in the direction orthogonal to medium conveying direction is suppressed by the pressure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

  A serial type ink jet printer, which is one of recording apparatuses, includes a paper feed roller that transports a recording sheet, which is a recording medium, and a driven roller thereof, and a main scanning direction orthogonal to the conveyance direction of the recording sheet on the platen. A carriage having a reciprocating recording head mounted thereon, a paper discharge roller for discharging the recording paper to a stacker, and a driven roller thereof. In such an ink jet printer, recording paper is recorded on a recording paper by ejecting ink droplets from the recording head by reciprocating the carriage while holding the recording paper between the paper feeding roller and its driven roller and transporting it on the platen. The recording paper is sandwiched by the paper discharge roller and its driven roller and discharged onto the stacker (see Patent Document 1).

JP 2004-352416 A

  Among the rollers of the ink jet printer described above, the driven roller of the paper feed roller and the driven roller of the paper discharge roller are not single long rollers, but are short ones arranged in parallel with a predetermined interval on the rotation shaft. It consists of a roller or a disk. Accordingly, since the recording paper is partially sandwiched in the thickness direction by the roller in the main scanning direction, the recording paper may be uneven due to a wavy phenomenon, that is, cockling. In such a case, since the recording paper floats on the platen, the recording paper may come into contact with the recording head and become contaminated. In addition, since the gap between the ink ejection surface of the recording head and the sheet conveying surface of the platen becomes non-uniform, the recording accuracy may be reduced.

  The present invention has been made in view of the various problems as described above, and an object of the present invention is to accurately convey a medium to be conveyed while suppressing deformation of the medium to be conveyed in a direction orthogonal to the medium conveyance direction. An object of the present invention is to provide a medium conveying apparatus that conveys a medium to be conveyed, a liquid ejecting apparatus including the medium conveying apparatus, and a recording apparatus.

  In order to achieve the above object, the medium conveying apparatus of the present invention includes a pressing unit that applies a force opposing to the direction perpendicular to the medium conveying direction and presses the medium to be conveyed from both sides when conveying the medium to be conveyed. It is characterized by that. As a result, deformation of the transported medium in the direction orthogonal to the medium transport direction is suppressed by the pressing force, so that the transport accuracy of the transported medium can be maintained in a highly accurate state.

  The pressing means bends the transported medium in an arch shape. Thereby, since the medium to be transported can always have a uniform shape, the transport accuracy of the medium to be transported can be maintained in a highly accurate state. Further, the pressing means includes a pair of opposed grooves that can pass through both sides of the transported medium at the same time and are separated by a distance smaller than the distance between both sides of the transported medium. Yes. Thereby, a press means can be comprised simply.

  Further, the pressing means includes a pair of opposed drum-shaped rollers that are capable of simultaneously passing through both sides of the transported medium and are spaced apart by a distance smaller than the distance between both sides of the transported medium. It is characterized by. Accordingly, the pressing unit can be configured easily, and the pressing unit can also function as a transport unit for the transported medium. The transported medium bent in an arch shape is transported in a state of being separated from the transport surface. Thereby, contamination of the back surface of the transported medium can be prevented.

  In order to achieve the above object, the liquid ejecting apparatus of the present invention includes a medium conveying device, and ejects the liquid from the ejecting head onto the ejected medium pressed by the pressing means. Thereby, the liquid ejecting apparatus having the above-described effects can be provided. The ejection head is movable along a guide shaft disposed in a direction orthogonal to the medium conveyance direction, and the guide shaft is bent based on a deflection amount of the ejection target medium. It is a feature. Further, the gap between the ejection head and the ejection medium is adjusted based on the amount of deflection of the ejection medium. As a result, the gap between the ejection head and the ejection target medium can always be the same, so that the liquid ejection accuracy can be maintained in a highly accurate state.

  In order to achieve the above object, the recording apparatus of the present invention is characterized by including a recording head for ejecting ink as an ejection head for ejecting liquid. Thereby, a recording apparatus that exhibits the above-described effects can be provided.

  Embodiments of the present invention will be described with reference to the drawings. The embodiments described below do not limit the invention according to the claims, and all the combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. Absent.

  FIG. 1 is a perspective view of an overall appearance configuration of an ink jet printer that is one of recording apparatuses according to an embodiment of the present invention as viewed obliquely from the front, and FIG. 2 is an internal configuration of the ink jet printer of FIG. FIG. 3 is a cross-sectional side view showing an outline of the internal configuration of the ink jet printer shown in FIG. 1. The ink jet printer 1 is configured in a small size suitable for recording on a recording sheet such as a relatively small postcard or L size.

  As shown in FIG. 1, the appearance of the ink jet printer 1 is configured by a housing 3, and a plurality of recording sheets can be set in an inclined posture at the rear of the apparatus, like an ink jet printer suitable for A4 size recording. A feeding device 2 is provided, and a stacker 6 for stacking recorded recording sheets is provided at the front of the device. A sheet conveying device 7 (see FIG. 3), which is a medium conveying device according to an embodiment of the present invention, is disposed between the feeding device 2 and the stacker 6 inside the apparatus.

  Further, an operation unit 5 constituted by a power button, a print setting button, and the like, and a display unit 4 for displaying recording setting contents, current operation status, and the like are disposed at the center of the upper surface of the apparatus of the ink jet printer 1. An openable / closable cover 3a that covers a card slot (not shown) in which a semiconductor memory medium storing image data and the like can be mounted is provided on the upper right. That is, the ink jet printer 1 not only connects to an external host computer and receives recording data, but also reads image data directly from a semiconductor memory storing image data, generates recording data, and records it by itself. Configured to be executable.

  As shown in FIGS. 2 and 3, the feeding device 2 includes a hopper 10, a movable guide 9, a fixed guide 8, a feeding roller 11, an idle roller 14, a friction separating material 13, and a return lever 12, which are further illustrated. Various components other than are provided. The feeding device 2 is provided with a unit having a frame 40 including the hopper 10 as a base so as to be rotatable, and in a use state shown by a solid line in FIG. On the other hand, in the storage state indicated by the phantom line in FIG. 3, the opening for inserting the recording paper is blocked to prevent entry of dust and the like. In the housed state, the feeding device 2 does not protrude rearward and can be made compact.

  The hopper 10 supports the recording paper in an inclined posture, and is driven to swing by a cam mechanism (not shown) around the swing fulcrum 10a to switch between a posture for pressing the recording paper against the feeding roller 11 and a posture for separating the recording paper. It is possible. A fixed guide 8 and a movable guide 9 provided in the hopper 10 guide the side edge of the recording paper, and the movable guide 9 can slide in the width direction of the recording paper so as to correspond to each size of the recording paper. Is provided.

  The feeding roller 11 has a substantially D shape when viewed from the side, and a roller main body 11b (having a drum shape with a flange) formed integrally with the feeding roller shaft 11a has a rubber. It is configured by winding the material 11c. The relationship between the roller body 11b and the rubber material 11c is such that the rubber material 11c is in contact with the recording paper at the arc portion, and the roller body 11b is in contact with the recording paper at the flat portion.

  The feed roller 11 is selectively rotated only when the paper is fed by the paper feed motor 39 and a clutch mechanism (not shown). When the paper is fed, the feeding roller 11 feeds the uppermost recording paper pressed against the feeding roller 11 by the circular arc portion to the downstream side, and when the paper feeding is finished, the downstream side conveyance drive roller Drive control is performed so that a flat portion in a substantially D shape in a side view faces the frictional separation member 13 so as not to generate a transport load during the paper transport operation by 21.

  Here, while the paper is being transported by the transport drive roller 21 on the downstream side, contact with the feeding roller 11 may cause a transport load, and contact marks that extend in the transport direction may be formed on the recording surface. Therefore, a free-rotating idle roller 14 is provided to prevent contact with the feeding roller 11 during sheet conveyance, thereby preventing the occurrence of conveyance load and contact traces. Further, since the idle rollers 14 are arranged substantially evenly in the paper width direction, it is possible to make the posture in the paper width direction uniform, thereby preventing the occurrence of skew or the like during paper conveyance (recording). It becomes possible to do.

  A friction separating material 13 as a separating means is provided at a position facing the feeding roller 11. The friction separating material 13 is pressed against the arc portion of the feeding roller 11 when the paper is fed to form a pressure contact, whereby the uppermost recording paper to be fed and the next and subsequent ones to be fed. Separate the recording paper. Further, a return lever 12 is provided at a position facing the feeding roller 11. The return lever 12 is provided so as to be rotatable about a rotation shaft 12a so that the rotation range of the return lever 12 overlaps with the pressure contact between the feeding roller 11 and the friction separating member 13, and by a cam mechanism described later. Drive controlled. The return lever 12 is tilted once so as to be retracted from the paper feed path during one rotation of the feed roller 11 and then rises again, so that the next and subsequent recording papers that are about to be double-fed are upstream. Return to.

  A paper detector 17 including a lever 15 and a detection unit 16 is provided on the downstream side of the feeding device 2. The lever 15 is provided so as to be able to oscillate about the oscillating shaft 15a, and the upper part from the oscillating shaft 15a is configured to come into contact with the recording paper to be fed. The detection unit 16 is an optical sensor. When the lower portion of the lever 15 enters the detection unit 16 as shown in the figure, light from the light emitting unit to the light receiving unit is blocked, and the recording paper does not pass. A state is detected. When the lever 15 swings with the passage of the recording paper, the lower portion of the lever 15 from the swinging shaft 15a is disengaged from the detection unit 16, so that the passage of the leading edge of the recording paper can be detected. It has become. Further, when the trailing edge of the recording sheet passes, the lower end portion of the lever 15 enters the detection unit 16 again, and thereby the passage of the trailing edge of the recording sheet can be detected.

  A paper transport device 7 is provided on the downstream side of the paper detector 17. The paper transport device 7 includes a transport driving roller 21, a transport driven roller 22, a platen 28, a fixed paper discharge roller 29a, a movable paper discharge roller 29b, and a fixed pressing guide (pressing means) 30a which is a characteristic part of the present invention. A movable pressing guide (pressing means) 30b and step 31 are provided, and various other components than those exemplified above.

  The transport driving roller 21 is rotationally driven by a paper feed motor 39 that is driven and controlled by the control unit 50, and the transport driven roller 22 is in pressure contact with the transport driving roller 21 and is driven to rotate. Then, the recording sheet fed by the feeding roller 11 is nipped between the conveyance driving roller 21 and the conveyance driven roller 22 and conveyed to the platen 28. The paper discharge rollers 29a and 29b are also rotationally driven by a paper feed motor 39 that is driven and controlled by the controller 50. Then, the recording sheet conveyed by the conveyance driving roller 21 and the conveyance driven roller 22 is nipped by the fixed sheet discharge roller 29a and the movable sheet discharge roller 29b and discharged to the stacker 6.

  The platen 28 supports the recording sheet from below to define a gap between the recording head 26 and the recording sheet opposed to the upper side, and a pressure guide 30 is provided on the upper surface before reaching the recording head 26. And step 31 is attached. Further, a recess 28 a is formed on the upper surface facing the recording head 26. When ink droplets are ejected to the end of the recording paper, so-called borderless recording is performed by ejecting the ink droplets to a portion off the end of the recording paper and throwing it away to the recess 28a. The ink droplets discarded in the recess 28 a are discharged to a lower portion through a discharge hole (not shown) and discharged to a waste liquid absorbing material 35 inside a waste liquid tray 34 provided at the lower portion of the platen 28.

  The recording head 26 is provided at the bottom of the carriage 25 and performs recording by discharging ink droplets toward the recording paper. While being guided by a carriage guide shaft 27 extending in the main scanning direction, the carriage 25 is reciprocated in the main scanning direction by receiving the power of a motor (not shown). The carriage 25 is not mounted with an ink cartridge, and ink is supplied from an ink cartridge (not shown) fixed to the bottom of the apparatus main body of the ink jet printer 1 to the recording head 26 via the ink tube 43 (see FIG. 2). It is comprised so that.

  FIG. 4 is a perspective view showing an outline of the sheet conveying device 7, and FIG. 5 is a front view thereof. The fixed pressing guide 30a and the movable pressing guide 30b are arranged to face each other so that the recording paper P conveyed on the upper surface of the platen 28 can be sandwiched from both sides. The fixed pressing guide 30a is fixed to the upper surface of the platen 28, and the movable pressing guide 30b is slidable in the width direction of the recording paper P on the upper surface of the platen 28 so as to correspond to each size of the recording paper P. Is provided. Further, in step 31, the recording paper is formed on the upper surface of the platen 28 so that the sharp side faces the upstream side of the conveyance on the upper surface of the platen 28 and is always positioned between the fixed pressing guide 30a and the movable pressing guide 30b. It is slidable in the width direction of P.

  A boundary portion between the opposing surface of the fixed pressing guide 30a and the movable pressing guide 30b and the upper surface of the platen 28 is formed in a groove that is parallel on the upstream side of the conveyance, but gradually increases toward the downstream side of the conveyance. It is formed in a groove that narrows. According to the fixed pressing guide 30a and the movable pressing guide 30b having such a shape, both sides of the recording paper P being conveyed are initially opposed to the fixed pressing guide 30a and the movable pressing guide 30b, and the upper surface of the platen 28. However, as the sheet is conveyed, a force opposed to the direction perpendicular to the conveyance direction is gradually applied and pressed, and the substantially central portion of the recording sheet P is lifted and stepped on step 31.

  Further, as the paper is further conveyed, the pressing force applied to both sides of the recording paper P increases and the substantially central portion of the recording paper P is lifted up and bends in an arch shape when reaching the recording head 26. In this way, the recording paper P is pressed by applying a force facing in the direction perpendicular to the conveyance from both sides, so that deformation such as cockling can be suppressed, and a uniform arch shape can be obtained at all times. Highly accurate conveyance can be performed.

  As shown in FIG. 5, the carriage guide shaft 27 is also bent in an arch shape based on the deflection amount of the recording paper P. As a result, the gap between the recording paper P bent in an arch shape and the recording head 26 can be kept substantially constant, so that recording can be performed with high accuracy on the recording paper P bent in an arch shape. it can. Further, the fixed paper discharge roller 29a and the movable paper discharge roller 29b are opposed to each other so that the recording paper P bent in a arch shape being conveyed can be sandwiched from both sides, and the upper part of the shaft is It is inclined to the outside. The fixed paper discharge roller 29a is fixed, and the movable paper discharge roller 29b is slidable in the width direction of the recording paper P so as to correspond to each size of the recording paper. As a result, the recording paper P bent in an arch shape can be discharged as it is. Further, since the conventional jagged roller is not necessary, the surface of the recording paper P can be eliminated.

  6 is a perspective view showing an outline of another example of the sheet conveying device 7 corresponding to FIG. 5, and FIG. 7 is a front view showing it corresponding to FIG. 6, which is the same as FIG. 5 and FIG. Constituent parts are denoted by the same reference numerals and description thereof is omitted. The sheet conveying device 7 includes a fixed pressing roller 32a and a movable pressing roller 32b instead of the fixed pressing guide 30a and the movable pressing guide 30b. The fixed pressing roller 32a and the movable pressing roller 32b are each formed in a drum shape, and are rollers that can sandwich the recording paper P conveyed on the upper surface of the platen 28 from both sides and bend in an arch shape. The surfaces are opposed to each other, and the shaft upper part is disposed to be inclined outward. The fixed pressing roller 32a is fixed to the upper surface of the platen 28, and the movable pressing roller 32b is slidable in the width direction of the recording paper P on the upper surface of the platen 28 so as to correspond to each size of the recording paper P. Is provided.

  According to the fixed pressing roller 32a and the movable pressing roller 32b having such a shape, both sides of the recording paper P being conveyed are gradually pressed with a force opposed in the direction perpendicular to the conveyance as the recording paper P is conveyed. The approximate center of P rises and rides on step 31. Further, as the paper is further conveyed, the pressing force applied to both sides of the recording paper P increases and the substantially central portion of the recording paper P is lifted up and bends in an arch shape when reaching the recording head 26. In this way, the recording paper P is pressed by applying a force facing in the direction perpendicular to the conveyance from both sides, so that deformation such as cockling can be suppressed, and a uniform arch shape can be obtained at all times. Highly accurate conveyance can be performed.

  Further, since the fixed pressing roller 32a and the movable pressing roller 32b themselves can apply a conveying force to the recording paper P, the conveying driven roller 22 shown in FIG. 6 is smaller than the conveying driven roller 22 shown in FIG. Thus, power saving and cost saving can be achieved. Further, it is possible to omit the transport driving roller 21, the transport driven roller 22, the fixed paper discharge roller 29a, and the movable paper discharge roller 29b so that only the fixed pressure roller 32a and the movable pressure roller 32b are used. Cost saving can be achieved.

  In each of the embodiments described above, the carriage guide shaft 27 is bent in an arch shape based on the deflection amount of the recording paper P, and the gap between the recording paper P and the recording head 26 in the arched state is substantially constant. However, the carriage guide shaft remains linear as in the prior art, and the recording head 26 is deflected in an arch shape by the gap automatic adjustment unit based on the amount of deflection of the recording paper P. The gap between the recording paper P and the recording head 26 in a state of being in a normal state may be kept substantially constant.

  8 and 9 are perspective views showing only related members around the installation site of the gap automatic adjustment unit. The automatic gap adjustment unit 180 includes a gap adjustment motor 181, a start end side drive transmission unit 182, and a synchronous drive transmission unit 183. Here, the left side frame 106 and the right side frame 107 are opposed to each other on both sides in the housing 101 in an upright state, and two carriage guide shafts (main guide shafts 167) are disposed between the side frames 106 and 107. The auxiliary guide shaft 168) is stretched in parallel. The main guide shaft 167 and the sub guide shaft 168 are provided on the rear surface side and the front surface side of the carriage 161 so as to sandwich the carriage 161, respectively.

  The gap adjusting motor 181 and the starting end side drive transmission means 182 are provided on the left side frame 106, and the synchronous drive transmission means 183 is provided on the right side frame 107. The starting end side drive transmission means 182 transmits the rotation of the gap adjustment motor 181 to the main guide shaft 167. The synchronous drive transmission means 183 transmits the rotation of the main guide shaft 167 to the sub guide shaft 168 in a synchronized state.

  FIG. 10 is a perspective view showing the start end side drive transmission means 182, FIG. 11 is a perspective view showing a state in which the synchronous drive transmission means 183 is attached to the right side frame 107, and FIG. 12 is the synchronous drive transmission means 183. It is a perspective view which shows the state which removed from the right side frame 107. FIG. As shown in FIG. 8, the rotation of the output shaft of the gap adjusting motor 181 is transmitted to the main guide shaft 167 by the starting end side drive transmission means 182 constituted by a toothed wheel train. A compound gear having a detection blade called a flag 182a is provided in the middle of the tooth wheel train, and the rotation of the main guide shaft 167 is detected by detecting the flag 182a by a rotation angle detection means such as a rotary encoder (not shown). The angle is controlled. Although not shown, the rotation angle of the sub guide shaft 168 is also detected and controlled by a rotary encoder or the like (not shown).

  The main guide shaft 167 is in sliding contact with the bearing portion 161a on the rear surface side of the carriage 161 shown in FIG. 8, and the guide shaft portion 167a that directly guides the reciprocation of the carriage 161 and the rotary shaft portions 167b provided at both ends thereof are the same. It has a concentric shaft structure arranged so as to pass through the center of the shaft. Further, the auxiliary guide shaft 168 is also in sliding contact with the bearing portion 161b on the front surface side of the carriage 161 shown in FIG. 8, and a guide shaft portion 168a that directly guides the reciprocation of the carriage 161, and rotating shaft portions 168b provided at both ends thereof. Have concentric shaft structures arranged so as to pass through the same axial center.

  A transmission gear 182b on the input side and a transmission gear 182c on the output side are integrally provided at both ends of the guide shaft portion 167a of the main guide shaft 167, respectively. The transmission gear 182 b is a gear positioned at the end of the start end side drive transmission means 182, and the transmission gear 182 c is a gear positioned at the start end of the synchronous drive transmission means 183. Further, a transmission gear 182d is also provided on the input side of the guide shaft portion 168a in the sub guide shaft 168, and this transmission gear 182d is a gear positioned at the end of the synchronous drive transmission means 183.

  Further, shift cams 169a are integrally provided at both ends of the guide shaft portions 167a and 168a of the main guide shaft 167 and the sub guide shaft 168. A cam follower 169b is provided below the shift cam 169a. The cam follower 169b is fixed to the side frames 106 and 107 via an adjuster 169c. The adjuster 169c rotates integrally with the ring-shaped cam follower 169b, and finely adjusts the height of the cam follower 169b by changing the mounting angle with respect to both side frames 106 and 107.

  FIG. 13 is an explanatory diagram showing the cam action of the shift cam 169a and the cam follower 169b, and FIG. 14 is a cam diagram showing the relationship between the gap and the rotation angle of the carriage guide shafts 167 and 168. As shown in FIGS. 13 and 14, the shift cam 169a has three transition regions having different cam height change characteristics. These transition areas are referred to as a first transition area 91, a second transition area 92, and a third transition area 93 in descending order of the cam height.

  In FIG. 14, the relationship between the gap PG and the rotation angle of each axis is shown separately for the main guide shaft 167 and the sub guide shaft 168. As is apparent from the figure, the main guide shaft 167 and the sub guide shaft 168 have very similar characteristics, and it can be seen that the two shafts rotate in synchronization. Of these, the main guide shaft 167 will be described as an example. In the first transition region, the gap PG is shifted from about 1.0 mm to about 2.3 mm at a rotation angle of 130 degrees. In the second transition region, the gap PG changes from about 2.3 mm to about 4.3 mm at a rotation angle of 53 degrees. In the third transition region, the gap PG changes from about 4.3 to 4.6 at a rotation angle of 40 degrees.

  Therefore, when the gap adjustment motor 181 is driven according to the unevenness amount and control is performed so that the gap is always constant, the gap PG and the rotation angle of the carriage guide shafts 167 and 168 correspond linearly, so the gap adjustment The number of steps of the motor 181 can be corrected as the rotation angle of the carriage guide shafts 167 and 168.

  In addition, the inkjet printer 100 described here has four desired gaps PG, which are 1.2 mm, 1.7 mm, 2.1 mm, and 4.5 mm in order of increasing gap PG. Among these, the gap PG adjustment of 1.2 mm, 1.7 mm, and 2.1 mm is performed in the first transition region, and the gap PG adjustment of 4.5 mm is performed in the third transition region, and the second transition region starts from 2.1 mm. It is used for setting change to 4.5 mm.

  As shown in FIGS. 11 and 12, an elevating frame 184 that can move up and down together with the carriage guide shafts 167 and 168 is provided on the right side frame 107. As shown in FIG. 12, the elevating frame 184 has fitting holes 184a that can receive the rotation shaft portions 167b and 168b of the carriage guide shafts 167 and 168, and a plurality of holes for attaching the gears. The mounting shaft 184b is projected outward. And as shown in FIG. 11, the toothed wheel row | line | column as the synchronous drive transmission means 183 is provided using the rotating shaft part 167b, 168b and the attachment shaft 184b which protrude from the fitting hole 184a.

  The toothed wheel train as the synchronous drive transmission means 183 is configured by arranging three intermediate gears 183a between the transmission gear 182c and the transmission gear 182d, and the rotation of the main guide shaft 167 in the same direction, The auxiliary guide shaft 168 can be transmitted at the same speed and the same timing. Further, the side frames 106 and 107 are provided with lifting guide means 185. The elevating guide means 185 is configured by forming four U-shaped guide grooves that engage with the rotation shaft portions 167 b and 168 b of the carriage guide shafts 167 and 168 with respect to the side frames 106 and 107.

  Further, a retaining piece 107 a bent in a hook shape on the lifting frame 184 side is provided on the right side frame 107. On the other hand, a concave or hook-shaped engagement groove 184c that engages with the retaining piece 107a is provided in the elevating frame 184. When the elevating frame 184 moves upward, the lower end side of the engaging groove 184c is By coming into contact with the retaining piece 107a, the lifting frame 184 is prevented from falling off the right side frame 107. The gap between the recording paper P bent in the arch shape and the recording head 26 can be kept substantially constant by the gap automatic adjusting unit 180 as well, so that the recording paper P bent in the arch shape can be maintained. Can be recorded with high accuracy.

  For example, a color material used for manufacturing a color filter such as a liquid crystal display as a meaning of a liquid ejecting apparatus that ejects a liquid corresponding to its use from a liquid ejecting head to an ejected medium instead of ink and attaches the liquid to the ejected medium. Ejection head, electrode material (conductive paste) ejection head used for electrode formation such as organic EL display and surface emitting display (FED), bio-organic matter ejection head used for biochip manufacturing, sample ejection head as precision pipette, etc. It can also be applied to other devices. Further, any recording apparatus provided with a liquid ejecting apparatus can be applied to, for example, a facsimile apparatus, a copying apparatus, and the like.

1 is a perspective view of an overall appearance configuration of an ink jet printer that is one of recording apparatuses according to an embodiment of the present invention, viewed obliquely from the front. FIG. It is the perspective view which looked at the whole internal structure of the printer of FIG. 1 from diagonally forward. FIG. 2 is a cross-sectional side view illustrating an outline of an internal configuration of the printer of FIG. 1. It is a perspective view which shows the outline of the paper conveying apparatus of the printer of FIG. FIG. 6 is a front view of the sheet conveying device in FIG. 5. It is a perspective view which shows the outline of another example of the paper conveying apparatus of the printer of FIG. FIG. 7 is a front view of the sheet conveying device in FIG. 6. FIG. 6 is a first perspective view showing only related members around the installation site of the gap automatic adjustment unit of the printer. It is a 2nd perspective view which shows only the relevant member around the installation site | part of the gap automatic adjustment part of a printer. It is a perspective view which shows the start end side drive transmission means of the gap automatic adjustment part of FIG. It is a perspective view which shows the state which attached the synchronous drive transmission means of the gap automatic adjustment part of FIG. 9 to the right side frame. FIG. 10 is a perspective view illustrating a state in which the synchronous drive transmission unit of the gap automatic adjustment unit of FIG. 9 is removed from the right side frame. It is explanatory drawing which shows the cam action of the shift cam of a gap automatic adjustment part of FIG. 9, and a cam follower. FIG. 10 is a cam diagram showing the relationship between the gap of the automatic gap adjustment unit of FIG. 9 and the rotation angle of the carriage guide shaft.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,100 Inkjet printer, 7 Paper conveyance apparatus, 21 Conveyance drive roller, 22 Conveyance driven roller, 25 Carriage, 26 Recording head, 27 Carriage guide shaft, 28 Platen, 29a Fixed discharge roller, 29b Movable discharge roller, 30a Fixed pressure guide, 30b Movable pressure guide, 31 steps, 32a Fixed pressure roller, 32b Movable pressure roller, 180 Gap automatic adjustment unit

Claims (9)

A medium conveying apparatus comprising: a pressing unit that applies a force that opposes a direction orthogonal to the medium conveying direction when pressing the medium to be conveyed, and presses the medium to be conveyed from both sides. The medium conveying apparatus according to claim 1, wherein the pressing unit bends the medium to be conveyed in an arch shape. The pressing means includes a pair of opposed grooves that are capable of simultaneously passing through both sides of the transported medium and spaced apart by a distance smaller than the distance between both sides of the transported medium. Item 3. The medium conveying device according to Item 1 or 2. The pressing means includes a pair of opposed drum-shaped rollers that can pass through both sides of the transported medium at the same time and are spaced apart by a distance smaller than the distance between both sides of the transported medium. The medium carrying device according to claim 1 or 2. The medium transport apparatus according to any one of claims 2 to 4, wherein the transported medium bent in an arch shape is transported in a state of being separated from a transport surface. A liquid ejecting apparatus comprising the medium conveying device according to claim 1, wherein a liquid is ejected from an ejecting head onto an ejected medium pressed by the pressing unit. The ejecting head is movable along a guide shaft disposed in a direction orthogonal to the medium transport direction, and the guide shaft is bent based on a deflection amount of the ejected medium. The liquid ejecting apparatus according to claim 6. The liquid ejecting apparatus according to claim 6, wherein a gap between the ejection head and the ejection target medium is adjusted based on a deflection amount of the ejection target medium. A recording apparatus comprising: a recording head that ejects ink as an ejection head that ejects the liquid according to claim 6.

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