JP2009208449A - Recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recorder which can make good an appearance of a recording medium discharged and can make good a stacking efficiency of the recording medium. <P>SOLUTION: In the recorder equipped with both a discharge driving roller 152 arranged on the conveyance direction downstream side from a recording region to give a conveyance force to a recorded paper P, and discharge following rollers 154 arranged opposite to the discharge driving roller 152 to rotate following the roller 152 holding the paper P between the roller 152 and the rollers 154, the discharge driving roller 152 is prepared by a pair arranged side by side in a direction orthogonal to a conveyance direction. Rotary shafts 158 of the pair of the discharge driving rollers 152 are inclined to the conveyance direction upstream side in a direction in which the shafts separate from each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a recording apparatus. The present invention particularly relates to a recording apparatus that records by discharging ink onto a conveyed recording medium.

In an ink jet recording type recording apparatus, an image or the like is recorded on a recording medium with ink ejected from a recording head, and the recording medium after recording is discharged (for example, see Patent Document 1). When ink lands on the recording medium, the recording medium absorbs the ink and extends.
Japanese Patent Laid-Open No. 9-48161

  When the recording medium is extended by ink, a wavy wrinkle is generated. In particular, when a large amount of ink lands on the recording medium with an increase in size of the recording head, there is a problem that the entire recording medium is lifted to the recording head side.

  In order to solve the above-described problem, a recording apparatus according to the present invention is disposed on the upstream side in the transport direction from the recording area of the recording head, the recording head for discharging and recording ink on the transported recording medium, A pair of conveying rollers that convey the recording medium to the recording area, a discharge driving roller that is arranged on the downstream side in the conveying direction from the recording area and applies a conveying force to the recorded recording medium, and faces the discharging drive roller And a discharge driven roller that rotates following the recording medium sandwiched between the discharge drive rollers, and the discharge drive rollers are arranged in pairs in a direction perpendicular to the transport direction. The rotation shafts of the pair of discharge drive rollers are inclined toward the upstream side in the transport direction in a direction away from each other. Accordingly, the recording medium can be sent to the downstream side in the transport direction while being pulled outward in the direction orthogonal to the transport direction by the discharge drive roller and the discharge driven roller. Therefore, the recording medium extended by the ink can be flattened.

  The recording apparatus may be characterized in that a pair of the discharge drive rollers are connected by a universal joint. Thereby, since a pair of discharge drive roller can be rotationally driven by one drive source, the cost of components, such as a motor and a gear, can be reduced.

  The recording apparatus may be characterized in that the rotation axis of the discharge driven roller can be tilted at least between a direction orthogonal to the transport direction and a direction parallel to the rotation axis of the discharge drive roller. Thus, when the recording medium is not interposed between the discharge driving roller and the discharge driven roller, the discharge driven roller is tilted to a position where the rotation shaft of the discharge driven roller and the rotation shaft of the discharge drive roller are parallel to each other. Accordingly, the contact pressure between the discharge driven roller and the discharge drive roller can be reduced as compared with the case where the rotation shaft of the discharge drive roller is inclined with respect to the rotation shaft of the discharge drive roller. It is possible to suppress the wear deterioration between the roller and the discharge drive roller and the scratching of these rollers.

  The recording apparatus is disposed upstream of the recording head in the transport direction, facing the recording medium transported by the pair of transport rollers, and spaced along a direction intersecting the transport direction. A plurality of presser members that give the recording medium a concave and convex shape that is continuous in the direction intersecting the transport direction by pressing and recessing the recording medium may be provided. As a result, it is possible to flatten the recording medium extended by ink while increasing the bending rigidity of the recording medium being transported to stabilize the behavior of the recording medium being transported.

  In the recording apparatus, the transport roller is rotationally driven, and a driving roller portion that transports the recording medium and a concave portion having a smaller diameter than the driving roller portion are alternately arranged in a direction intersecting the transport direction. A driven roller portion that is driven and rotated by sandwiching a recording medium between the conveying drive roller and the driving side roller portion, and is arranged with an interval in a direction intersecting the conveying direction; The pressing member may be a pressing roller that is alternately arranged on the conveyance driven roller with the driven side roller portion and has a larger diameter than the driven side roller portion. As a result, a sudden change in posture of the recording medium that has passed between the conveyance driving roller and the conveyance driven roller can be suppressed, so that the recording medium can be moved farther in a stable state in the recording area of the recording head. Can be transported.

  It should be noted that the above summary of the invention does not enumerate all the necessary features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  FIG. 1 is a perspective view showing the internal structure of an ink jet recording apparatus 100 according to an embodiment. FIG. 2 is a plan view showing the internal structure of the recording apparatus 100.

  Note that the rear side in the drawing on the upstream side in the conveyance direction of the sheet P as a recording medium in the recording apparatus 100 will be described as the rear side in the recording apparatus 100. Further, the front side in the drawing on the downstream side in the conveyance direction of the paper P in the recording apparatus 100 will be described as the front side in the recording apparatus 100. A direction orthogonal to the transport direction is referred to as a paper width direction. In the drawing, the transport direction is indicated by an arrow Y, and the paper width direction is indicated by an arrow X.

  As shown in these drawings, the recording apparatus 100 includes a rectangular frame 110 in plan view, and includes internal mechanisms such as a transport unit 170 and a carriage 160 on the frame 110. A paper feed tray 120 is disposed at the rear of the frame 110. The paper feed tray 120 includes a paper support 122 that rises obliquely upward, and side supports 124 and slide supports 126 that are disposed on both sides of the paper support 122 in the paper width direction.

  The paper support 122 supports the paper P from the rear side of the recording apparatus 100. The side support 124 is fixed to one end (the right end in the figure) of the paper support 122 in the paper width direction. Further, the slide support 126 is attached to the paper support 122 so as to be slidable in the paper width direction and to be able to contact and separate from the side support 124. Here, by sliding the slide support 126 toward the side support 124 and sandwiching the paper P between the slide support 126 and the side support 124 in the paper width direction, various paper P having different widths can be positioned in the width direction.

  Further, the frame 110 is provided with a rear frame 112 erected on the rear side of the apparatus, side frames 114 erected on both the left and right sides of the apparatus, and a front frame 116 erected on the front side of the apparatus. . The rear frame 112 supports the carriage 160 on the front surface thereof. The carriage 160 can move horizontally along a guide portion 118 formed at the lower portion of the rear frame 112. Further, a timing belt 146 stretched approximately horizontally on a pair of pulleys 148 is disposed between the carriage 160 and the rear frame 112, and a part of the timing belt 146 is coupled to the carriage 160. The carriage 160 is reciprocated in a substantially horizontal direction when the pulley 148 is driven to rotate and the timing belt 146 is rotated.

  Further, recording heads 164 and 165 are mounted on the bottom surface of the carriage 160, and an ink cartridge (not shown) containing ink is mounted on the recording heads 164 and 165. The recording heads 164 and 165 are arranged in the paper width direction. Further, the recording head 164 is arranged offset with respect to the recording head 165 toward the downstream side in the transport direction. As a result, the length in the transport direction of the recording area of the recording heads 164 and 165 is extended to twice that of the recording heads 164 and 165. For example, the length of the recording area of the recording heads 164 and 165 is 1 inch, whereas the length of the recording area of the recording heads 164 and 165 is 2 inches.

  In the recording area of the recording heads 164 and 165, the platen 140 is arranged to face the recording heads 164 and 165 in the vertical direction. The platen 140 extends substantially horizontally in the transport direction and the paper width direction, and supports the transported paper P from below.

  A maintenance unit 166 including a cap member and the like is disposed on the side (right side in the drawing) of the platen 140. The position where the maintenance unit 166 is arranged is set as the home position of the carriage 160. When the carriage 160 is in the position, the recording head 164 is covered with a cap member. This prevents clogging of the recording head 164 due to ink drying.

  Further, in the vicinity of the lower end of the paper support 122, a transport unit 170 that transports the paper P loaded on the paper support 122 one by one into the apparatus is provided. FIG. 3 shows a 3-3 cross-sectional view in FIG. As shown in this figure, the transport unit 170 includes a transport lower guide 172, a transport upper guide 174, a paper feed roller 176, and a transport roller 180. The conveyance roller 180 includes a conveyance driving roller 182 and a conveyance driven roller 184.

  The lower conveyance guide 172 extends from the vicinity of the lower end of the paper support 122 toward the front side of the apparatus while being inclined obliquely downward. Further, the transport upper guide 174 is disposed to face the upper surface of the transport lower guide 172. Further, the paper feed roller 176 is disposed near the lower end of the paper support 122 so as to face the upstream end in the transport direction of the lower transport guide 172, and the paper P loaded on the paper support 122 one by one in front of the apparatus. Feed to the side. The transport roller 180 is disposed at the downstream end of the transport lower guide 172 and the transport upper guide 174 in the transport direction, and transports the paper P fed by the paper feed roller 176 by holding it to the front side of the apparatus. To do.

  A discharge unit 150 is disposed downstream of the platen 140 in the transport direction. The discharge unit 150 includes a pair of discharge driving rollers 152 disposed on the lower side of the conveyance path of the paper P, a plurality of discharge driven rollers 154 and a plurality of discharge guide rollers 156 disposed on the upper side of the conveyance path of the paper P. It has.

  The pair of discharge drive rollers 152 are arranged side by side in the paper width direction, and the plurality of discharge driven rollers 154 are arranged side by side in the paper width direction so as to face the discharge drive roller 152 via the paper conveyance path. The plurality of discharge guide rollers 156 are arranged side by side in the paper width direction upstream of the plurality of discharge driven rollers 154 in the transport direction. A triangular tooth pattern is continuously formed on the outer peripheral surface of the discharge guide roller 156, and the contact area between the discharge guide roller 156 and the recording surface of the paper P is reduced.

  FIG. 4 is a perspective view of the transport unit 170, the platen 140, and the discharge unit 150. As shown in FIGS. 3 and 4, the transport driving roller 182 is disposed along the paper width direction at the downstream end of the transport lower guide 172 in the transport direction, and is rotationally driven by a motor 181 (see FIG. 6). . Further, the transport drive roller 182 is rotatably supported by the bearing portion 189 from the lower side. Further, the transport driven roller 184 is rotatably supported at the downstream end of the transport upper guide 174 in the transport direction.

  The lower conveyance guide 172 is fixed to the frame 110, whereas the upper conveyance guide 174 is supported by the rear frame 112 so as to be rotatable around an axis extending in the paper width direction. Here, on the upper surface of the transport upper guide 174, a plurality of tension coil springs 178 as biasing members are arranged along the paper width direction. One end of the tension coil spring 178 in the axial direction is attached to the upper surface of the transport upper guide 174, and the other end in the axial direction is attached to the rear frame 112. The tension coil spring 178 urges the transport upper guide 174 in a direction in which the upstream side in the transport direction is lifted and the downstream side in the transport direction is lowered. The pressure is in contact with the transport drive roller 182.

  Further, a plurality of guide ribs 142 extending in the transport direction are formed on the upper surface of the platen 140 at predetermined intervals in the paper width direction. Each guide rib 142 protrudes upward, and its upstream end portion in the transport direction is close to the axial center of the drive side roller portion 185 of the transport drive roller 182.

  FIG. 5 shows the transport roller 180 in a front view. As shown in this figure, the conveyance driving roller 182 and the conveyance driven roller 184 which are in pressure contact with each other and constitute the conveyance roller 180 convey the paper P while sandwiching it. The transport driving roller 182 includes a plurality of driving side roller portions 185 arranged at intervals along the axial direction, and a plurality of concave portions 186 each arranged between the driving side roller portions 185. That is, in the conveyance driving roller 182, the driving side roller portion 185 and the concave portion 186 are alternately arranged along the axial direction.

  On the other hand, the transport driven roller 184 includes a plurality of driven roller portions 187 arranged at intervals along the axial direction, and a plurality of presser rollers 188 each arranged between the driven roller portions 187. ing. In other words, in the transport driven roller 184, the driven roller portion 187 and the pressing roller 188 are alternately arranged along the axial direction.

  The driving side roller portion 185 and the driven side roller portion 187 are arranged to face each other in the vertical direction, and are in pressure contact with each other. Further, the recess 186 and the pressing roller 188 are arranged to face each other in the vertical direction and are separated from each other.

  The concave portion 186 has a smaller shaft diameter than the driven roller portion 187, and taper portions 1861 that gradually decrease in diameter toward the center in the axial direction are formed at both axial ends of the concave portion 186. A thin shaft portion 1862 having a uniform diameter is formed in the central portion in the axial direction. On the other hand, the presser roller 188 is formed in a barrel shape. The center portion in the axial direction of the presser roller 188 is formed in a cylindrical shape with a substantially flat peripheral surface, and both end portions in the axial direction of the presser roller 188 have a bowl shape curved in an R shape toward the inner diameter side with the peripheral surface extending to both ends. Is formed.

  The central portion in the axial direction of the presser roller 188 faces the thin shaft portion 1862 of the recess 186 with a gap. Further, both end portions in the axial direction of the pressing roller 188 are opposed to the tapered portion 1861 of the recess 186 with a gap. The central portion in the axial direction of the presser roller 188 has a larger shaft diameter than the driven roller portion 187 and bulges toward the concave portion 186 from the nip portion (contact surface) between the driving roller portion 185 and the driven roller portion 187. Yes. For this reason, the sheet P conveyed by the conveying roller 180 is depressed at a plurality of positions arranged at predetermined intervals in the sheet width direction by being pressed downward by the plurality of pressing rollers 188, so that the sheet P is uneven in the sheet width direction. It is corrected to a continuous corrugated plate shape.

  In addition, a bearing portion 189 is disposed below the recessed portion 186 disposed in the center among the plurality of recessed portions 186. A U-shaped bearing groove that opens upward is formed in the upper portion of the bearing portion 189, and the thin shaft portion 1862 of the concave portion 186 is rotatably fitted in the bearing groove. That is, the concave portion 186 is rotatably supported by the bearing portion 189.

  Here, the driving-side roller portion 185 of the transport driving roller 182 is subjected to a roughening process such as embossing, but a plurality of concave portions 186 including the concave portion 186 supported by the bearing portion 189. Is not subjected to roughening treatment such as embossing. For this reason, the concave portion 186 supported by the bearing portion 189 is formed more smoothly than the driving side roller portion 185, and sliding resistance between the thin shaft portion 1862 of the concave portion 186 and the bearing groove is suppressed. ing.

  Further, the driven roller portion 187 of the transport driven roller 184 is subjected to a roughening process such as embossing, whereas the presser roller 188 is subjected to a roughening process such as embossing. Not. For this reason, the surface of the pressing roller 188 is smoother than the surface of the driven roller portion 187, and the friction coefficient of the pressing roller 188 is lower than the friction coefficient of the driven roller portion 187. As a result, the conveyance added by the sheet P from the press roller 188 is reduced.

  A pair of pressing rollers 188 are arranged at both ends in the width direction of the sheet P, and both ends in the width direction of the sheet P are pressed and depressed by the pressing roller 188 toward the platen 140. In this embodiment, the outermost pressing roller 188 among the plurality of pressing rollers 188 is disposed in the width direction of the paper P, but this is not essential, and the inner side of the pressing roller 188 is not essential. The presser rollers 188 may be disposed at both ends in the width direction of the paper P.

  6 and 7 are perspective views of the transport unit 170 viewed from the upstream side in the transport direction. FIG. 8 is a bottom view of the transport unit 170 as viewed from below. In FIG. 6, the lower conveyance guide 172 is not shown.

  As shown in these drawings, a plurality of presser ribs 1741 extending in the transport direction are arranged on the lower surface of the transport upper guide 174 at intervals in the paper width direction. Each presser rib 1741 protrudes downward and is arranged side by side with the presser roller 188 of the transport driven roller 184 in the transport direction. Each presser rib 1741 extends toward the axial center of the presser roller 188.

  Each presser rib 1741 gradually increases in width in the paper width direction from the upstream side to the downstream side in the transport direction, and the side wall of each presser rib 1741 gradually increases from the upstream side in the transport direction to the downstream side. The separation distance is increased in the paper width direction. In addition, the width | variety of the pressing rib 1741 here points out the distance between the said side walls. Therefore, the rib having the structure in which the presser rib 1741 is bifurcated also gradually increases from the upstream side to the downstream side in the transport direction if the distance between the side walls gradually increases from the upstream side in the transport direction to the downstream side. This corresponds to a rib whose width in the paper direction widens.

  On the upper surface of the lower conveyance guide 172, guide ribs 1721 (illustrated by dotted lines in FIG. 8) as upstream guide ribs extending in the conveyance direction are formed at intervals in the paper width direction. Each guide rib 1721 protrudes upward, and is arranged side by side with the driving roller portion 185 of the transport driving roller 182 in the transport direction. Each guide rib 1721 extends toward the axial center of the driving roller 185.

  In FIG. 9, the discharge driving roller 152 and the discharge driven roller 154 are shown in a plan view. In FIG. 9, the upstream side in the transport direction is illustrated as the upper side, and the downstream side in the transport direction is illustrated as the lower side. FIG. 10 is a front view of the discharge driving roller 152 and the discharge driven roller 154 as viewed from the downstream side in the conveyance direction.

  As shown in these drawings, the pair of discharge drive rollers 152 are arranged side by side in the paper width direction. A plurality of roller portions 153 are arranged on the discharge drive roller 152 at predetermined intervals in the axial direction. A plurality of discharge driven rollers 154 are arranged at predetermined intervals in the axial direction, and the roller portion 155 and the roller portion 153 of the discharge driven roller 154 are in pressure contact with each other.

  The rotation shafts 158 of the pair of discharge drive rollers 152 are inclined toward the upstream side in the transport direction in a direction away from each other (outside in the paper width direction). That is, the rotation shafts 158 of the pair of discharge driving rollers 152 are arranged in a V shape when the downstream side in the transport direction is viewed downward.

  Further, the pair of discharge drive rollers 152 are connected by a universal joint, a universal joint, such as a knuckle joint 190, and the rotation of one discharge drive roller 152 around the rotation shaft 158 is transmitted to the other discharge drive roller 152. As a result, the other discharge drive roller 152 rotates about the rotation shaft 158. Accordingly, the pair of discharge drive rollers 152 rotate with the position of the rotation shaft 158 kept constant.

  The plurality of discharge driven rollers 154 are arranged in a V shape (when viewed from the upstream side in the transport direction) along the rotation shaft 158 in a V shape. On the outer peripheral surface of the roller portion 155 of the discharge driven roller 154, a triangular tooth shape is continuously formed. A through hole is formed at the center of the roller portion 155, and an elastic shaft 157 is inserted into the through hole, and the roller portion 155 is rotatably supported by the elastic shaft 157.

  The elastic shaft 157 is disposed along the paper width direction. Here, the elastic shaft 157 is configured by an elastic member that can be bent and deformed by elasticity, for example, a tension coil spring. In a linear state, the elastic shaft 157 supports the roller portion 155 so that the rotation shaft 159 is orthogonal to the transport direction. On the other hand, the elastic shaft 157 is curved so as to swell in the transport direction, thereby allowing displacement of the roller portion 155 in the transport direction and swinging (tilting) in the paper width direction with the shaft center as a fulcrum. .

  FIG. 11A shows the discharge driven roller 154 in a plan view. FIG. 11B is a cross-sectional view taken along the line BB in FIG. Further, FIG. 11C shows a cross-sectional view taken along the line CC of FIG.

  As shown in these drawings, the discharge driven roller 154 is supported by a rectangular parallelepiped support 192 via an elastic shaft 157. The support 192 is formed with a roller arrangement portion 194 and an elastic shaft arrangement portion 196. The roller arrangement part 194 is a rectangular space penetrating up and down and having the conveying direction as a longitudinal direction in plan view. On the other hand, the elastic shaft arrangement portion 196 is a rectangular space orthogonal to the roller arrangement portion 194 and having the paper width direction as the longitudinal direction in plan view.

  The roller placement portion 194 is provided with a roller portion 155. The tooth mold portions at both upper and lower ends of the roller portion 155 protrude vertically from the roller arrangement portion 194. An elastic shaft 157 is disposed on the elastic shaft arrangement portion 196. Locking portions 197 and 198 are formed at both ends in the longitudinal direction of the elastic shaft arrangement portion 196 so as to lock both ends in the axial direction of the elastic shaft 157. Both ends in the axial direction of the elastic shaft 157 are locked to the locking portions 197 and 198 in a curved state so as to swell upward.

  The roller arrangement portion 194 is provided with a pair of inner wall surfaces 1941 that face each other in the paper width direction with the roller portion 155 interposed therebetween. The pair of inner wall surfaces 1941 and the side surfaces 1551 of the roller portion 155 on both sides in the paper width direction are separated from each other, and swinging (tilting) to both sides in the paper width direction with the axis of the roller portion 155 as a fulcrum is permitted. Yes. Note that the longitudinal direction of the roller placement portion 194 may be inclined with respect to the transport direction, and the rotation shaft 159 of the roller portion 155 may be inclined with respect to the paper width direction.

  By the way, when the inclination angle of the rotation shaft 159 of the roller portion 155 with respect to the paper width direction increases, the distance between the side surface 1551 and the inner wall surface 1941 becomes narrow on both sides in the paper width direction, and finally they come into contact with each other. That is, the swing range of the roller portion 155 is restricted by the inner wall surfaces 1941 on both sides. Here, the swing range of the roller portion 155 is set so that the rotation shaft 159 can tilt between a position orthogonal to the transport direction and a position parallel to the rotation shaft 158 of the discharge drive roller 152.

  Next, the operation in this embodiment will be described. In the recording apparatus 100, when a print job is started, the paper P loaded in the paper feed tray 120 is sent out between the lower conveyance guide 172 and the upper conveyance guide 174 by the paper supply roller 176. The paper P sent out by the paper feed roller 176 is supported from below by the guide rib 1721 of the conveyance lower guide 172 and is pushed downward by the press rib 1741 to be recessed. As a result, the paper P changes to a corrugated shape in which unevenness continues in the width direction in the width direction. Here, as the width of the presser rib 1741 gradually increases from the upstream side to the downstream side in the transport direction, the paper P gradually changes from a shape without irregularities to a corrugated plate shape.

  The paper P that has been changed into a corrugated plate enters between the transport driving roller 182 and the transport driven roller 184 that constitute the transport roller 180. A portion swelled to the upper side of the sheet P (hereinafter referred to as a peak portion) enters a nip portion between the driving side roller portion 185 and the driven side roller portion 187. On the other hand, a portion (hereinafter referred to as a valley) that is recessed below the sheet P enters a gap between the recess 186 and the pressing roller 188.

  While the sheet P passes between the conveyance driving roller 182 and the conveyance driven roller 184, the peak portion is held between the driving side roller portion 185 and the driven side roller portion 187 and the valley portion is pressed against the pressing roller 188. Is pushed into the recess 186 side to be recessed. As a result, the paper P is corrected to a corrugated shape in which unevenness continues in the width direction. At this time, both ends in the width direction of the paper P pass between the press roller 188 and the recess 186, and are pressed and recessed by the press roller 188 toward the recess 186.

  The sheet P corrected to the corrugated plate shape receives the conveying force of the conveying roller 180 and passes between the platen 140 and the recording heads 164 and 165. At this time, the paper P is intermittently transported in small amounts in the transport direction, and the carriage 160 moves forward or backward each time the paper P is transported in small amounts in the transport direction. The recording heads 164 and 165 form an image on the paper P by ejecting ink while the carriage 160 moves horizontally. Here, in this embodiment, the recording heads 164 and 165 are arranged offset in the transport direction, so that the length of the recording area in the transport direction is expanded to twice that of the recording heads 164 and 165. Accordingly, the transport distance of each paper P can be extended, so that the transport speed of the paper P can be increased, thereby improving the throughput of the printing process.

  Then, the paper P on which the image is formed is sent to the discharge unit 150 by receiving the transport force of the transport roller 180. The paper P is guided between the discharge driving roller 152 and the discharge driven roller 154 by the discharge guide roller 156 and then passes between them. At this time, the roller portion 153 of the discharge driving roller 152 abuts on the back surface of the paper P and applies a conveyance force. On the other hand, the roller portion 155 of the discharge driven roller 154 is driven to rotate with the tooth tip of the outer peripheral portion being in contact with the recording surface of the paper P. Thus, the paper P is discharged out of the apparatus without disturbing the image on the recording surface.

  FIG. 12 shows the operation in the discharge unit 150. As shown in this figure, the rotation shafts 158 of the pair of discharge drive rollers 152 are inclined from the downstream side in the transport direction to the upstream side from the inner side to the outer side in the paper width direction. For this reason, a conveying force F that is inclined outward in the sheet width direction with respect to the conveying direction is applied from the roller portion 153 of the discharge driving roller 152 to the back surface of the sheet P. Here, since the pair of discharge drive rollers 152 are arranged symmetrically with respect to the central portion in the width direction of the paper P, a symmetrically conveying force F acts on the paper P.

  For this reason, a force to the downstream side in the transport direction acts on the paper P, and a force T to the outside in the width direction acts on the paper P. Therefore, the paper P is pulled downstream in the transport direction in a state of being pulled outward in the width direction. Sent. Thereby, the paper P extended by the ink can be flattened. In particular, it is possible to suppress the entire sheet P extended by the ink from being lifted toward the recording heads 164 and 165. Therefore, the behavior of the paper P can be stabilized and the recording quality can be improved.

  FIG. 13 is a plan view showing a state in which the roller portion 155 of the discharge driven roller 154 is in contact with the roller portion 153 of the discharge drive roller 152 without passing through the paper P. As shown in this figure, when the paper P is not interposed between the roller portion 155 and the roller portion 153, the conveying force F acts from the roller portion 153 to the roller portion 155, so that the roller portion 155 is elastic. The rotating shaft 159 tilts to a position parallel to the rotating shaft 158 of the roller portion 153 against the urging force of the shaft 157.

  Thereby, the contact pressure between the tooth-shaped portion of the roller portion 155 and the roller portion 153 can be reduced as compared with the case where the rotation shaft 159 of the roller portion 155 is inclined with respect to the rotation shaft 158 of the roller portion 153. . Therefore, it is possible to suppress wear deterioration between the tooth-shaped portion of the roller portion 155 and the roller portion 153, and it is possible to suppress scratching of the roller portion 153.

  Further, in this embodiment, the pair of discharge drive rollers 152 whose rotation shafts 158 are inclined with respect to each other are connected by the universal joint 190 so that the rotation can be transmitted, so the pair of discharge drive rollers 152 are rotationally driven by one drive source. it can. Therefore, the cost of parts such as a motor and a gear can be reduced.

  In the present embodiment, the paper P is corrected to a corrugated shape by the transport roller 180 and transported in the recording area, thereby increasing the cross-sectional second moment of the paper P transported in the recording area and increasing the rigidity of the paper P. Is increasing. As a result, the behavior of the paper P conveyed in the recording area can be stabilized, and the occurrence of contact and rubbing between the paper P and the recording heads 164 and 165 can be suppressed. In addition, since fluctuations in the clearance between the paper P and the recording heads 164 and 165 can be suppressed, the ink landing accuracy on the paper P can be improved, thereby improving the image quality.

  In addition, since the paper P is corrected to the corrugated shape by the transport roller 180 instead of the corrugated shape imparting member disposed downstream of the transport roller 180 in the transport direction, the posture of the paper P that has passed through the transport roller 180 is abrupt. Will not fluctuate. As a result, the paper P can be transported further in the recording area of the recording heads 164 and 165 with its behavior stabilized. Therefore, even when the recording areas of the recording heads 164 and 165 are expanded in the transport direction as in this embodiment, the behavior can be continuously stabilized while the paper P is transported in the recording area. Therefore, the contact and rubbing between the paper P and the recording heads 164 and 165 can be suppressed, and the ink landing accuracy on the paper P can be improved.

  Further, in the present embodiment, the paper P is corrected to a corrugated plate shape with the paper P sandwiched between the driving side roller portion 185 and the driven side roller portion 187. Thereby, the fluctuation of the paper P when the posture of the paper P is changed to the corrugated plate shape can be suppressed as compared with the case where the paper P is passed through the space in which the ribs are arranged in a zigzag manner.

  In addition, by changing the paper P entering the transport roller 180 into a corrugated plate shape in advance by the pressing rib 1741 and the guide rib 1721, the posture of the paper P transported to the recording area of the recording heads 164 and 165 is more gentle. Can be changed. Thereby, the behavior of the paper P conveyed in the recording area can be further stabilized. Further, it is possible to prevent the sheet P entering the transport roller 180 from being folded and wrinkled.

  The presser rib 1741 gradually increases in width from the upstream side to the downstream side in the transport direction, and gradually changes the paper P from a flat shape to a corrugated plate shape. Accordingly, the posture of the paper P conveyed to the recording area of the recording heads 164 and 165 can be changed more gradually, and the behavior of the paper P conveyed in the recording area can be further stabilized.

  In the present embodiment, on the platen 140, the guide rib 142 extends along the transport direction on the downstream side in the transport direction of the drive side roller unit 185 of the transport drive roller 182, and the peak portion of the paper P is It is supported by the guide rib 142. As a result, the height of the peak portion of the paper P from the platen 140 becomes the height of the guide rib 142, so that the variation in the clearance between the paper P and the recording heads 164 and 165 can be suppressed.

  In the present embodiment, the guide rib 1721, the driving roller unit 185 and the driven roller unit 187, the guide rib 142, and the roller unit of the discharge driving roller 152 and the discharge driven roller 154 are on a straight line along the transport direction. It is arranged. Thereby, the attitude | position of the paper P can be maintained favorable.

  Here, since the paper P that has passed through the transport roller 180 tends to extend toward the biased side, that is, the valley side, if both ends in the width direction of the paper P correspond to peaks, the paper P The force to extend at both ends in the width direction of P becomes large, and the posture of the paper P tends to collapse. On the other hand, in this embodiment, since the press roller 188 presses both ends in the width direction of the paper P to form valleys, it is possible to suppress the force to extend at both ends in the width direction of the paper P. It becomes possible to maintain the posture.

  Further, in this embodiment, a roughening process is performed on the driving side roller portion 185 of the transport driving roller 182 and the driven side roller portion 187 of the transport driven roller 184. As a result, a frictional force can be generated between the paper P and the driving roller unit 185, and between the paper P and the driven roller unit 187, and the conveyance force of the paper P by the driving roller unit 185 and the driven roller unit 187 can be increased. It can be secured.

  On the other hand, the concave portion 186 of the transport driving roller 182 is not roughened and is smoother than the driving side roller portion 185. Thereby, the frictional resistance between the bearing groove in the bearing portion 189 and the thin shaft portion 1862 in the concave portion 186 can be reduced, and wear deterioration between the bearing groove and the thin shaft portion 1862 in the bearing portion 189 can be suppressed. Further, the pressing roller 188 of the conveyance driven roller 184 is not subjected to the roughening process, and the surface friction coefficient is lower than that of the driven side roller portion 187. As a result, the frictional resistance between the press roller 188 and the paper P can be reduced, and the conveyance load applied to the paper P by the press roller 188 can be reduced.

  In this embodiment, the presser roller 188 is formed in a barrel shape, and both ends in the axial direction are formed in an R shape when viewed from the radial direction. As a result, the paper P can be curved in an R shape along the pressing roller 188, and the paper P can be prevented from being folded or rubbed. Further, the frictional resistance between the pressing roller 188 and the paper P can be further reduced, and the conveyance load applied to the paper P by the pressing roller 188 can be further reduced.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

1 shows a perspective view of an internal structure of an ink jet recording apparatus 100 according to an embodiment. The internal structure of the recording device 100 which concerns on one Embodiment is shown with a top view. 3-3 sectional drawing in FIG. 2 is shown. The conveyance part 170, the platen 140, and the discharge part 150 are shown with a perspective view. The transport roller 180 is shown in a front view. The conveyance part 170 is shown with the perspective view which looked at the conveyance direction upstream. The conveyance part 170 is shown with the perspective view which looked at the conveyance direction upstream. It shows in the bottom view which looked at the conveyance part 170 from the downward side. The discharge driving roller 152 and the discharge driven roller 154 are shown in a plan view. The discharge driving roller 152 and the discharge driven roller 154 are shown in a front view as viewed from the downstream side in the transport direction. (A) shows the discharge driven roller 154 in a plan view. (B) shows BB sectional drawing of (A). (C) shows CC sectional drawing of (A). The effect | action in a discharge part is shown. The discharge driven roller is shown in a plan view.

Explanation of symbols

100 recording device, 110 frame, 112 rear frame, 114 side frame, 116 front frame, 118 guide section, 120 paper feed tray, 122 paper support, 124 side support, 126 slide support, 140 platen, 142 guide rib, 146 timing belt, 148 Pulley, 150 discharge section, 152 discharge drive roller, 153 roller section, 154 discharge driven roller, 155 roller section, 156 discharge guide roller, 157 elastic shaft, 158 rotation shaft, 159 rotation shaft, 160 carriage, 164 recording head, 165 recording Head, 166 Maintenance unit, 170 Conveying section, 172 Conveying lower guide, 1721 Guide rib, 174 Conveying upper guide, 176 Paper feeding roller, 178 Tension coil spring, 18 Conveyance roller, 181 Motor, 182 Conveyance drive roller, 184 Conveyance driven roller, 185 Drive side roller section, 186 Concavity, 187 Drive side roller section, 188 Pressing roller, 189 Bearing section, 190 Universal joint, 192 Support body, 194 Roller arrangement Portion, 196 elastic shaft arrangement portion, 197 engagement portion, 198 engagement portion, 1551 side surface, 1741 presser rib, 1861 taper portion, 1862 thin shaft portion, 1941 inner wall surface

Claims (5)

A recording head for recording by ejecting ink onto the conveyed recording medium;
A pair of conveying rollers disposed upstream of the recording area of the recording head in the conveying direction and conveying a recording medium to the recording area;
A discharge driving roller that is disposed downstream of the recording area in the transport direction and applies a transport force to the recorded recording medium;
A discharge driven roller disposed opposite to the discharge drive roller and driven to rotate with a recording medium sandwiched between the discharge drive roller;
With
A pair of the discharge drive rollers are arranged side by side in a direction perpendicular to the transport direction, and the rotation shafts of the pair of discharge drive rollers are inclined toward the upstream side in the transport direction toward the direction away from each other. Recording device.   The recording apparatus according to claim 1, wherein the pair of discharge driving rollers are connected by a universal joint.   The recording apparatus according to claim 1, wherein the rotation shaft of the discharge driven roller can be tilted at least between a direction orthogonal to a conveyance direction and a direction parallel to the rotation shaft of the discharge drive roller.   Located upstream of the recording head in the transport direction, facing the recording medium transported by the pair of transport rollers and spaced along the direction intersecting the transport direction, the recording medium is pressed and recessed. The recording apparatus according to claim 1, further comprising a plurality of pressing members that give the recording medium a concavo-convex shape that is continuous in a direction intersecting the transport direction. The transport roller is
A driving driving roller portion that conveys the recording medium by being rotationally driven, and a conveying driving roller in which concave portions having a smaller diameter than the driving side roller portion are alternately arranged in a direction intersecting the conveying direction;
A driven roller that is driven and rotated with a recording medium sandwiched between the driven roller unit and a conveyance driven roller that is disposed at an interval in a direction intersecting the conveyance direction;
With
The recording apparatus according to claim 4, wherein the pressing member is a pressing roller that is alternately arranged on the conveyance driven roller with the driven-side roller portion and has a larger diameter than the driven-side roller portion. .

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