JP2006225114A - Medium carrying device, and recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medium carrying device, capable of maintaining high-precision delivery of mediums, and a recording device and a liquid injection device provided with the medium carrying device. <P>SOLUTION: A long holding member 61 to hold a roller 156 for delivering a medium to be carried and a long mounting member 62 on which the holding member is mounted are formed of different materials. The holding member and the mounting member are fixed at two positions at a prescribed interval along the length, and a flexible part 67 is provided at one position of fixture parts 65 and 66. Even if the holding member and the mounting member have different thermal expansion coefficients, expansion difference can be absorbed by the flexible part. Generation of warping due to temperature change of work environments can thus be restricted to maintain the high-precision delivery of mediums. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

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

  Inkjet printers, which are one type of recording apparatus, include a type in which paper is fed from the back side and discharged to the front side, and a type in which paper is fed and discharged from the front side. In both types of ink jet printers, the paper stored in the paper feed tray is taken out and fed by the paper feed roller, and is recorded by the recording head while being nipped and conveyed by the paper feed roller and its driven roller, The paper is sandwiched between a paper discharge roller and a serrated roller as a driven roller thereof, and is discharged onto a paper discharge tray. The above-mentioned serrated roller is a disc-shaped roller with a saw blade formed around it. Usually, several serrated rollers are attached to a holder made of plastic, and a plurality of holders are arranged in a long frame made of metal. It is attached (see Patent Document 1).

JP 2004-58555 A

  Since the frame becomes longer when the above-described ink jet printer becomes large, the number of holders equipped with a serrated roller attached to the frame increases. For this reason, variations in the direction of the jagged rollers are likely to occur, and there is a risk that the paper discharge accuracy will be reduced. Further, there is a risk that the part cost due to the increase in the number of parts and the assembly cost due to the increase in the number of assembly steps may be increased. Then, the said problem can be eliminated by making it the elongate holder which integrated the some holder.

  However, while the frame is made of metal, the holder is made of plastic, and since the coefficient of thermal expansion is different, warping may occur due to temperature changes in the usage environment. To avoid this, the frame and holder may be made of the same material. However, when plastic is used, the disadvantage is that the size increases to increase strength, and when metal is used, the weight increases. Occurs.

  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 transport apparatus capable of maintaining high-precision medium discharge, a recording apparatus including the medium transport apparatus, and a liquid jet. To provide an apparatus.

  To achieve the above object, in the medium conveying apparatus of the present invention, a medium including a roller for discharging a conveying medium, a long holding member for holding the roller, and a long mounting member to which the holding member is attached. In the conveying device, the holding member and the mounting member are formed of different materials, and the holding member and the mounting member are fixed at two positions with a predetermined interval in the longitudinal direction. It is characterized in that a flexible portion is provided at a location. Thereby, even if the thermal expansion coefficients of the holding member and the mounting member are different, the flexible portion can absorb the difference in expansion and contraction. Therefore, the occurrence of warpage due to the temperature change in the use environment is suppressed, and a highly accurate medium Emission can be maintained.

  The flexible portion is flexible only in a direction connecting the two fixed portions. Moreover, when the said holding member is attached to the said attachment member, it is contacting only in the said 2 fixed part. Thereby, the expansion / contraction difference in the longitudinal direction having the greatest influence can be reliably absorbed by the flexible portion. Further, the flexible portion has a product flexibility of a distance between the two fixed portions, a difference in thermal expansion coefficient between the holding member and the mounting member, and a temperature difference in a use environment. It is a feature. Thereby, a flexible part can be designed correctly.

  The flexible portion extends from the main body of the holding member in a direction orthogonal to the flexible direction and is formed in a beam shape that holds both sides of the fixing portion. The flexible portion is bent with respect to the fixed portion to absorb a difference in expansion and contraction between the holding member and the mounting member. Thereby, since a flexible part bends in parallel with a longitudinal direction, it can absorb almost all expansion-contraction differences.

  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. In order to achieve the above object, the medium conveying apparatus of the present invention is a liquid ejecting apparatus that ejects liquid onto a medium to be ejected, and is characterized by including each of the medium conveying apparatuses. Thereby, a recording apparatus or a liquid ejecting apparatus that exhibits the above-described effects can be provided.

  A combined body comprising a long attachment member and a long attachment member formed of different materials, the attachment member and the attachment member being fixed at two positions with a predetermined interval in the longitudinal direction, It is characterized in that a flexible part is provided at one place among the fixed parts. Thereby, even if the thermal expansion coefficients of the attachment member and the attached member are different, the difference in expansion and contraction that occurs can be absorbed by the flexible portion, so that it is possible to suppress the occurrence of warpage due to a temperature change in the use environment.

  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. The ink jet printer 100 is a desktop large-sized printer that can record on a relatively large size so-called cut paper and roll-shaped paper such as JIS standard A4 size to JIS standard A2 size. The housing 101 is covered with a substantially rectangular parallelepiped housing 101 extending in the width direction. In addition, the conveyance part 150 (refer FIG. 5) including the characteristic part of this invention is mentioned later.

  A rectangular window portion 102 is formed on the upper surface of the housing 101. The window 102 is covered with a transparent or translucent window cover 103. The window cover 103 is attached so as to be rotatable in the direction of the arrow a in the figure around the upper rotation shaft. The user can perform maintenance work of the internal mechanism through the window portion 102 by lifting the window cover 103 and opening the window portion 102.

  On both sides of the front surface of the housing 101, cartridge storage portions 104 into which a plurality of ink cartridges are inserted and removed are formed. Each ink cartridge stores ink of each color for recording. Each cartridge housing portion 104 is covered with a transparent or translucent cartridge cover 105. The cartridge cover 105 is attached so as to be rotatable in the direction of the arrow b shown in the figure around a rotation shaft at the lower part thereof. The user can perform an ink cartridge replacement operation or the like by lightly pressing the cartridge cover 105 to release the locking portion and opening the cartridge storage portion 104.

  An operation unit 110 for instructing a printer operation is disposed on an upper portion of the cartridge housing unit 104 on the right side of the front surface of the housing 101. The operation unit 110 displays buttons 111 such as a power system for turning on / off the power, an operation system for operating a cueing of a paper sheet or operating ink flushing, a processing system for performing image processing, and the like. A liquid crystal panel 112 and the like are provided. The user can operate the button 111 while looking at the liquid crystal panel 112 for confirmation.

  A tank housing portion 106 into which the waste liquid tank 120 is inserted and removed is formed at the lower part of the cartridge housing portion 104 on the right side of the front surface of the housing 101. The waste liquid tank 120 stores waste ink that is discarded when the recording head 162 (see FIG. 5) is cleaned or when the ink cartridge is replaced. By pulling out the waste liquid tank 120, the user can perform a work of discarding the waste ink accumulated inside.

  On the back surface of the housing 101, a paper feed unit 130 that feeds roll-shaped paper is disposed so as to protrude rearward from the upper part. A roll paper holder (not shown) capable of setting one roll-shaped paper is disposed inside the paper supply unit 130, and a flip-up-type openable and rollable roll paper cover 131 is provided on the front surface of the paper supply unit 130. Is attached so as to cover a roll paper holder (not shown). The user can perform operations such as attaching / removing roll paper by lifting the roll paper cover 131 and opening the paper supply unit 130. Note that the upper surface of the roll paper cover 131 is formed as a paper feed guide surface capable of manually feeding the cut paper.

  Between the front center of the housing 101, that is, between the pair of cartridge storage portions 104, a paper supply / discharge tray 200 on which cut sheets before recording and cut sheets after recording or roll-shaped sheets are stacked is inserted and removed. A paper feed / discharge unit 140 is formed. The paper supply / discharge unit 140 is also formed so that thick paper that cannot be bent during conveyance can be manually fed.

  A front portion of the paper supply / discharge tray 200 is inserted into the paper supply / discharge portion 140 and fixed so that the rear portion of the paper supply / discharge tray 200 protrudes. The paper supply / discharge tray 200 is formed in a cassette type, and cut sheets to be fed before recording are stacked and stored therein, and cut sheets or roll-shaped sheets to be discharged after recording are stacked on the upper side. Sheets are stacked and placed. The detailed structure of such a paper supply / discharge tray 200 will be described below with reference to FIGS.

  FIG. 2 is a perspective view of the entire external configuration of the paper feed / discharge tray 200 as viewed obliquely from the front. The paper feed / discharge tray 200 includes a paper feed tray 210 formed in a box shape and a paper discharge tray 230 formed in a lid shape covering the upper surface of the paper feed tray 210. The paper supply / discharge tray 200 is formed to be extendable and retractable in the paper supply / discharge direction, and can be stored compactly when not in use, and corresponds to cut sheets of various sizes when used. It is possible.

  3 and 4 are perspective views showing the paper supply / discharge unit 140 with the paper supply / discharge tray 200 mounted thereon. When the cut sheets are stacked and placed, as shown in FIG. 3, the roll paper guide unit 240 is stored in the upper surface of the paper discharge member 239a, that is, the upper surface of the paper discharge member 239a is flat. As a result, the cut sheet discharged through the sheet discharge roller 155 (see FIG. 5) has a side surface and a bottom surface of the guide portion 145 having an L-shaped cross section and upper surfaces of the sheet discharge members 239a to 239d. Are smoothly stacked and placed on the sheet receiving surface formed by

  Note that a sponge mat 145 a is attached to the bottom surface of the guide portion 145. The sponge mat 145a is configured such that when the second cut sheet is ejected after the first cut sheet is placed, the leading end of the second cut sheet is the first sheet. It has a non-slip function for preventing the cut sheet from sticking out and falling off the sheet receiving surface.

  On the other hand, when stacking roll-shaped sheets, as shown in FIG. 4, on the other long side of the first guide plate 241 of the roll sheet guide 240 stored on the upper surface of the sheet discharge member 239a. The user puts his finger and turns it backward. Then, the second guide plate 242 is pulled by the first guide plate 241, and one end side in the longitudinal direction is lifted, and the other end side in the longitudinal direction is along the groove 239aa formed on the upper surface of the paper discharge member 239a. Slide backwards. Then, the first guide plate 241 is turned until the angle formed by the first guide plate 241 and the second guide plate 242 becomes an acute angle.

  Thus, the second guide plate 242 has a slide-like shape in which one end side in the longitudinal direction is close to the top of the side surface of the guide portion. For this reason, even if the roll-shaped paper discharged through the paper discharge roller is curled, the leading end thereof is not caught in the guide portion side, and the leading end is a slide-like second guide plate. It slides on 242 and is guided to the upper surface side of the paper discharge members 239a to 239d. Therefore, the roll-shaped paper is smoothly stacked and placed on the paper discharge receiving surface formed by the second guide plate 242 and the upper surfaces of the paper discharge members 239a to 239d.

  FIG. 5 is a cross-sectional side view showing an outline of the internal configuration of the ink jet printer 100 of FIG. In the housing 101, a paper supply / discharge unit 140, a recording unit 160, a transport unit 150 including a characteristic part of the present invention, and the like are disposed. The paper supply / discharge unit 140 is provided with a hopper 141, a paper supply roller 142, a separation member 143, and the like for feeding cut paper. The hopper 141 is formed in a flat plate shape on which a cut sheet can be placed. One end of the hopper 141 is located in the vicinity of the paper feed roller 142 and the separating member 143 and the other end of the paper feed / discharge tray 200 is mounted. It is disposed so as to be located in the vicinity of the bottom surface of the paper feeding unit 210. The hopper 141 has the other end of the compression spring 144 attached at one end to the bottom surface of the housing 101 on the back surface at one end side, and the one end side pivots around the other end side by the expansion and contraction of the compression spring 144. It is arranged like this.

  The paper feed roller 142 is formed in a D shape with a part of a cross section cut out, and rotates intermittently to frictionally convey the cut paper on the hopper 141. The separation member 143 is formed with a rough upper surface, and when the paper cut by the paper feed roller 142 is double fed, the lower cut paper is frictionally separated from the uppermost cut paper. It has become. Here, the relationship between the cut sheet placed on the hopper 141 and the paper feed roller 142 will be described with reference to FIG.

  FIG. 6 is a diagram illustrating a contact state between the cut sheet placed on the hopper 141 and the paper feed roller 142. FIG. 6A shows a case where the maximum number of cut sheets P is placed on the hopper 141. In this case, when the hopper 141 is raised, the uppermost cut sheet P1 is fed to the paper feed roller. It adjusts so that it may not contact the notch part of 142 but may contact at least the circumference after the circular arc start point 142a.

  FIG. 6B shows a case where the minimum number (one) of cut sheets P1 is placed on the hopper 141. In this case, when the hopper 141 is lifted, the cut sheets P1. Is adjusted so as to come into contact with a point 142b slightly rotated from the arc start point 142a of the paper feed roller 142. The contact point 142b has a circumferential length from the contact point 142b to the arc end point 142c equal to the distance a from the leading edge ps of the paper P1 to the contact point 151a between the sub roller 151 and its driven roller 152a. This is the point.

  By adjusting as described above, when the number of the cut sheets P placed on the hopper 141 is equal to or less than the maximum number, the leading edge ps of the uppermost cut sheet P1 is moved to the sub roller 151 and its driven roller 152a. The cut paper P1 is not released from the paper feed roller 142 until it reaches the contact point 151a, so that the cut paper P1 can be reliably delivered to the sub-roller 151, and a paper feed error can be eliminated.

  The transport unit 150 includes a sub-roller 151 for transporting paper and its driven rollers 152a, 152b, and 152c, a paper feed roller 153 and its driven roller 154, a paper discharge roller 155, and a driven roller including characteristic portions of the present invention. 156, detection sensors 157a and 157b for detecting the paper, and the like are provided. The sub roller 151 sandwiches the cut sheet together with the driven rollers 152a, 152b, and 152c and reverses it into a U-shape in order to discharge the cut sheet fed from the sheet feeding tray 210 to the sheet discharge tray 230. It is designed to be transported. Further, the sub-roller 151 sandwiches and conveys the roll-shaped paper together with the driven roller 152c in order to eject the roll-shaped paper fed from the paper feeding section 130 to the paper ejection section 230. .

  The paper feed roller 153 sandwiches the cut paper that has been reversely conveyed or the roll-shaped paper that is fed together with the driven roller 154 and feeds it to the platen 163. The paper discharge roller 155 supports the paper passing through the platen 163 alone or sandwiches it together with the driven roller 156 and discharges it onto the paper discharge tray 230. The detection sensor 157a detects the transport amount when the skew of the cut paper that is fed is taken. The detection sensor 157b is configured to detect a conveyance amount when cueing a cut sheet that is reversely conveyed or a roll-shaped sheet that is conveyed.

  In the recording unit 160, a carriage 161, a recording head 162, a platen 163, a support rib 164, and the like are disposed. The carriage 161 is connected to a carriage belt (not shown). When the carriage belt is operated by a carriage driving device (not shown), the carriage 161 is entrained by the movement of the carriage belt and guided by a guide shaft (not shown) to reciprocate on the paper in the conveyance orthogonal direction. It is supposed to move. Furthermore, the carriage 161 is mounted with a recording head 162 that can eject ink droplets toward a lower sheet.

  The recording head 162 includes, for example, a plurality of black ink recording heads that eject two types of black ink, and a plurality of color inks that respectively eject six ink droplets of yellow, dark yellow, cyan, light cyan, magenta, and light magenta. Recording head. The recording head 162 is provided with a pressure generation chamber and a nozzle opening connected to the pressure generation chamber. The ink is stored in the pressure generation chamber and pressurized at a predetermined pressure to control the recording head 162 from the nozzle opening toward the sheet on the platen 163. Ink droplets of a specified size are ejected. The platen 163 supports and guides the paper conveyed from the paper feed roller 153 and the driven roller 154 toward the paper discharge roller 155 and the driven roller 156 on the recording guide surface 163a which is the upper surface thereof, or the support rib 164. It is designed to support and guide you.

  The support rib 164 includes a rib 21 that protrudes or retracts from a slit 163b (see FIG. 10) formed in the recording guide surface 163a of the platen 163, and a switching shaft 22 that switches the protrusion / retraction of the rib 21. The rib 21 is formed in a substantially triangular plate shape, and a corner portion of the arc shape protrudes from the recording guide surface 163a to support the sheet. Both ends of the switching shaft 22 are supported by side surfaces 163c (see FIG. 10) of the platen 163. A plurality of ribs 21 are arranged on the circumferential surface of the switching shaft 22 at predetermined intervals in the axial direction.

  According to such a support rib 164, by rotating the switching shaft 22, in the slit 163 b formed in the recording guide surface 163 a of the platen 163, the arc-shaped corner portion and the flat portion of the rib 21 can be arbitrarily set. You can switch to That is, the rib 21 can be projected by positioning the arc-shaped corner of the rib 21 in the slit 163b formed in the recording guide surface 163a of the platen 163, and the flat portion of the rib 21 is positioned. The rib 21 can be retracted. Therefore, it is possible to deal with paper having many attributes that will be described in detail later by the above switching.

  7A, 7B, and 7C are a plan view, a front view, and a perspective view showing a detailed configuration of the unit of the driven roller 156, which is a characteristic part of the present invention. This driven roller unit (combined body) 60 is a long roller holder (holding member (attached member)) for holding a plurality of sets (four sets in this example) of driven rollers 156, each of which includes a pair of the serrated roller 11 and roller roller 12. 61 and a long holder frame (attachment member) 62 to which a plurality of (four in this example) roller holders 61 are attached.

  The serrated roller 11 has a saw blade-like protrusion formed on its peripheral surface, and is surely conveyed by biting into the recording surface of the paper and sandwiching the paper with the paper discharge roller 155. The roller roller 12 has a smooth peripheral surface, and is surely conveyed by pressing the recording surface of the paper and sandwiching the paper with the paper discharge roller 155. The roller holder 61 is made of a plastic material such as ABS, and is configured to hold four sets of driven rollers 156 at a predetermined interval. The holder frame 62 is made of, for example, a metal material such as steel, and is configured so that the four roller holders 61 can be mounted side by side.

  8 and 9 are a perspective view and a plan view showing the details of the roller holder 61, respectively. The roller holder 61 is formed in a substantially rectangular parallelepiped shape. The roller holder 61 has an attachment portion 63 to which the knurled roller 11 is attached, an attachment portion 64 to which the roller roller 12 is attached, a fixing portion 65 that is fixed to the holder frame 62, and a holder frame 62. The fixing part 66 provided with the flexible part 67 to fix is provided.

  Four attachment portions 63 are provided on one side of the roller holder 61 so as to rotatably support the four knurled rollers 11. Four attachment portions 64 are provided on the other side of the roller holder 61 so as to rotatably support the four roller rollers 12. That is, the attachment portions 63 and 64 are formed so as to protrude from the main body 61 a of the roller holder 61, and depressions 63 a and 64 a that support both ends of the rotating shafts of the knurled roller 11 and the roller roller 12 are formed.

  The fixing portion 65 is provided in the center of one end side of the main body 61a of the roller holder 61 in the shape of a cylindrical protrusion, and a screw hole 65a for screwing with the holder frame 62 is drilled. The fixing portion 66 is in the shape of a cylindrical body integrally formed with a rectangular plate-like flexible portion 67 and is provided at the center of the other end side of the main body 61a of the roller holder 61 with a gap from the main body 61a. The screw hole 66a for screw fastening is perforated.

  That is, the fixing portions 65 and 66 are provided at predetermined intervals in the longitudinal direction of the main body 61a of the roller holder 61, and screws (not shown) for screwing the holder frame 62 and screws are screwed into the screw holes 65a and 66a. Combined. The flexible portion 67 is formed in a beam shape that extends from the main body 61 a of the roller holder 61 in a direction (width direction) orthogonal to the longitudinal direction and holds both sides of the fixed portion 66.

  In other words, the flexible portion 67 is configured such that one end of a portion extending in an opposite direction is integrated on both sides of the fixing portion 66, and the other end is integrated with the main body 61 a of the roller holder 61. And the space | gap is formed in the both sides of the longitudinal direction of the flexible part 67. FIG. Accordingly, since the flexible portion 67 can be bent symmetrically about the fixed portion 66, the flexible portion 67 bends only in the direction connecting the two fixed portions 65 and 66, that is, parallel to the longitudinal direction of the roller holder 61. It becomes. Furthermore, when the roller holder 61 is screwed to the holder frame 62, the fixing portions 65, 66 are formed in a shape protruding from the main body 61a so as to come into contact only with the fixing portions 65, 66.

  Therefore, even if the thermal expansion coefficients of the roller holder 61 made of plastic and the holder frame 62 made of metal are different, the flexible part 67 can absorb almost all of the longitudinal expansion / contraction difference that has the greatest effect. Therefore, it is possible to suppress the occurrence of warpage due to the temperature change of the use environment and maintain the discharge of the paper with high accuracy. The flexible portion 67 has flexibility determined by the product of the distance between the two fixed portions 65 and 66, the difference in thermal expansion coefficient between the roller holder 61 and the holder frame 62, and the temperature difference in the usage environment. Have. Thereby, the flexible part 67 can be designed correctly.

  10 and 11 are perspective views showing a drive mechanism for the driven roller 156 and the support rib 164, and FIG. 12 is a schematic three-view diagram thereof. FIG. 11 shows a state where the lever 40 in FIG. 10 is removed. The driven roller 156 is a switching shaft that switches the contact / separation between the above-described jagged roller 11 and the roller 12 that are in contact with or separated from the recording surface of the sheet conveyed onto the paper discharge roller 155. 14 is provided.

  The switching shaft 14 is axially supported so as to be rotatable in an elliptical hole 15a formed in the frame 15 at both ends and movable in the hole 15a. Further, on the circumferential surface of the switching shaft 14, the release roller 13 shown in FIG. 5 in which the serrated roller 11, the roller 12, the serrated roller 11, and the roller 12 are not disposed is disposed at a predetermined interval in the circumferential direction, and A plurality of sets are arranged at predetermined intervals in the axial direction.

  According to such a driven roller 156, by rotating the switching shaft 14, it is possible to arbitrarily switch between the jagged roller 11 and the roller 12, the jagged roller 11 and the release unit 13, and the roller 12 and the release unit 13. The switching between the jagged roller 11 and the release unit 13 or the roller roller 12 and the release unit 13 is a pseudo contact / separation of the jagged roller 11 or the roller roller 12 with respect to the recording surface of the sheet. Therefore, it is possible to deal with paper having many attributes, which will be described in detail later, by the above switching. The follower roller 156 is provided with three kinds of the roller roller 156, the roller roller 12, and the release part 13 one by one. However, the invention is not limited to this. You may make it arrange | position by arbitrary combinations.

  The switching shaft 14 of the driven roller 156 and the switching shaft 22 of the support rib 164 described above are interlocked by the gear mechanism 30. The gear mechanism 30 includes a roller gear 31 fitted to one end of the switching shaft 14, a rib gear 32 fitted to one end of the switching shaft 22, a first intermediate gear 33 and a second intermediate gear meshing between the roller gear 31 and the rib gear 32. A gear 34 and a planetary gear 35 that intermittently meshes with the second intermediate gear 34 are provided. The planetary gear 35 has a function of switching between switching driving of the switching shafts 14 and 22 and release driving of the driven rollers 152a, 152b, and 152c by forward and reverse rotation of a motor (not shown).

  Furthermore, the gear mechanism 30 connects the shafts of the roller gear 31, the first intermediate gear 33, and the second intermediate gear 34, and is attached to one end of the switching shaft 14 and an arm 37 that is locked to the frame 15 via a spring 36. The inserted positioning cam 38 (refer to FIG. 11), the positioning lever 40 (refer to FIG. 12) locked to the arm 37 via the spring 39 and also locked to the positioning cam 38, and on / off depending on the position of the arm 37 A limit switch 41 is provided. Further, a phase detection cam 42 (see FIG. 12) fitted in the other end of the switching shaft 14 and a limit switch 43 (see FIG. 12) that is turned on / off depending on the position of the phase detection cam 42 are provided.

  The spring 36 biases the arm 37 downward, so that the switching shaft 14 is normally positioned at a fixed position in the hole 15a. Three positioning notches 38 a are provided on the circumferential surface of the positioning cam 38 in accordance with the switching position of the switching shaft 14, that is, the switching position of the serrated roller 11, the roller 12, and the release portion 13. The positioning lever 40 is provided at one end with a projection 40a that meshes with the positioning notch 38a of the positioning cam 38, and is provided on the side surface of the arm 37 so that the projection 40a can slide along the circumferential surface of the positioning cam 38. It is slidably attached.

  The spring 39 urges the positioning lever 40 in the sliding direction, so that the protrusion 40 a of the positioning lever 40 is constantly pressed against the peripheral surface of the positioning cam 38. On the peripheral surface of the phase detection cam 42, three phase detection cutouts 42 a are provided in accordance with the switching position of the switching shaft 14, that is, the switching position of the serrated roller 11, the roller 12, and the release unit 13.

  According to such a gear mechanism 30, the driving force of the motor is transmitted from the second intermediate gear 34 to the rib gear 32 via the planetary gear 35 and also transmitted to the roller gear 31 via the first intermediate gear 33. Therefore, the switching shaft 22 and the switching shaft 14 can be interlocked to switch the protrusion / retraction of the rib 21 and the switching of the giza roller 11, the roller 12, and the release unit 13 at the same time. The switching shaft 14 of the driven roller 156 and the switching shaft 22 of the support rib 164 can be interlocked by a pulley and a belt mechanism instead of the gear mechanism.

  When the switching between the knurled roller 11, the roller 12 and the release unit 13 is performed, the positioning cam 38 and the phase detection cam 42 rotate with the rotation of the switching shaft 14, and the protrusion 40 a of the positioning lever 40 is used for positioning the positioning cam 38. The lever of the limit switch 43 is disengaged from the phase detection notch 42a of the phase detection cam 42 and is slid along the peripheral surface while being disengaged from the notch 38a and sliding along the peripheral surface. From the signal from the limit switch 43, it can be reliably detected that the switching operation is being performed. When an abnormality occurs such that the switching shaft 14 is lifted from a fixed position below the hole 15a due to some external factor, the arm 37 is separated from the limit switch 41. The occurrence of abnormality can be reliably detected.

  When the protrusion 40a of the positioning lever 40 is reengaged with the positioning notch 38a of the positioning cam 38 and the lever of the limit switch 43 is reengaged with the phase detection notch 42a of the phase detection cam 42, the jagged roller 11 and the roller roller 12 and the release unit 13 are switched. Thus, since the protrusion 40a of the positioning lever 40 and the positioning notch 38a of the positioning cam 38 are engaged with each other, the phases of the serrated roller 11, the roller 12 and the release portion 13 can be reliably matched. Further, it is possible to reliably detect the completion of the switching operation by a signal from the limit switch 43.

  FIG. 13 is a diagram specifically illustrating a switching state between the driven roller 156 and the support rib 164. In FIG. 13A, the driven roller 156 is switched to the release unit 13, and the jagged roller 11 and the roller 12 are separated from the paper discharge roller 155, and the support rib 164 has the rib 21 on the recording guide surface 163 a of the platen 163. Retracted from. In FIG. 13B, the driven roller 156 is switched to the jagged roller 11 or the roller roller 12, and the jagged roller 11 or the roller roller 12 is in contact with the paper discharge roller 155. The support rib 164 has the rib 21 recorded on the platen 163. It is in a state of being retracted from the guide surface 163a.

  In FIG. 13C, the driven roller 156 is switched to the jagged roller 11 or the roller 12, and the jagged roller 11 or the roller 12 is in contact with the paper discharge roller 155, and the support rib 164 has the rib 21 recorded on the platen 163. The state protrudes from the guide surface 163a. By performing such switching, it is possible to obtain a paper discharge form that is optimal for the attributes of the paper.

  FIG. 14 is a diagram illustrating a switching state of the driven roller 156 and the support rib 164 corresponding to the sheet attribute. As shown in FIG. 14A, when the paper type is cut paper and the paper state is normal, the paper is switched to the jagged roller 11 and the rib 21 is protruded to switch the optimum paper discharge. It can be in the form. This is because normal cut paper is less likely to have jagged marks and is likely to lift.

  As shown in FIG. 14 (2), when the paper type is cut paper and the paper state is easily damaged, the optimal paper discharge mode is obtained by switching to the roller roller 12 and the rib 21 protruding. can do. This is because, in the case of cut paper that is easily damaged, a roller having a smooth peripheral surface is less likely to be damaged and more likely to be lifted.

  As shown in FIG. 14 (3), when the paper type is roll paper and the paper state is normal, switching to the release unit 13 and switching to the state in which the ribs 21 are retracted enables optimal discharge. It can be in paper form. In the case of normal roll paper, it is necessary to cut with a cutter, so there is a risk of interference if there is a jagged roller 11 or roller 12, and there is a risk of rubbing if there is a rib 21 because it is curled.

  As shown in FIG. 14 (4), when the paper type is roll paper and the paper state is thin, the state is changed only when discharging from the release unit 13 to the jagged roller 11 and the rib 21 is always retracted. By switching to, an optimal paper discharge form can be obtained. This is because in the case of a thin roll paper, static electricity is likely to be generated, so that it may stick to the platen 163 and the like, making it difficult to discharge the paper.

  As shown in FIG. 14 (5), when the paper type is roll paper and the paper state is highly hygroscopic, the release unit 13 switches from the recording unit 13 to the jagged roller 11 from recording to paper discharge and the rib 21. By switching to a state in which the paper is always retracted, an optimum paper discharge form can be obtained. This is because a highly hygroscopic roll paper is likely to be lifted by so-called cockling, and because it is curled, it may be rubbed if the rib 21 is present.

  As shown in FIG. 14 (6), when the paper type is roll paper and the paper state is cut short, the state is switched only when discharging from the release unit 13 to the serrated roller 11 and the rib 21 is always retracted. By switching to, an optimal paper discharge form can be obtained. This is because, in the case of roll paper to be cut short, there is a possibility that it will be difficult to discharge on the platen 163, and because it is curled, there is a risk of rubbing if there is a rib 21.

  As shown in FIG. 14 (7), when the paper type is manual paper and the paper state is heavy, the optimal discharge form is obtained by switching to the release unit 13 and switching to the state in which the rib 21 is retracted. It can be. This is because, in the case of thick manual feed paper, there is a possibility of interference if there are the jagged roller 11, the roller 12 and the rib 21. By storing such data as a table in the control unit of the ink jet printer 100, the driven roller 156 and the support rib 164 can be automatically switched.

  In the above-described embodiment, the switching shaft 14 of the driven roller 156 and the switching shaft 22 of the support rib 164 are configured to be interlocked by the gear mechanism 30, but the present invention is not limited to this, and the driven roller 156 The switching shaft 14 and the switching shaft 22 of the support rib 164 may be configured to operate independently by separate gear mechanisms or the like. Further, even if only the driven roller 156 is provided and the support rib 164 is not provided, it is possible to cope with paper having many attributes.

  With this configuration, the operation when recording on a normal cut sheet by the ink jet printer 100 will be described with reference to FIGS. First, the control unit automatically switches between the driven roller 156 and the support rib 164 corresponding to the normal cut sheet. That is, the driven roller 156 is switched to the jagged roller 11, and the rib 21 of the support rib 164 is retracted. The cut sheets P stacked and housed in the sheet feeding tray 210 of the sheet feeding / discharging tray 200 attached to the sheet feeding / discharging unit 140 are compressed with the sheet bundle mechanically synchronized with the rotation of the sheet feeding roller 142. When the hopper 141 is lifted by the restoration of the spring 144, it is pressed against the paper feed roller 142, and only the uppermost cut sheet P is separated by the separation member 143 and fed to the transport unit 150.

  Then, as shown in FIG. 15A, when the cut sheet P to be fed reaches the contact point 151a between the sub roller 151 and the driven roller 152a, the cut sheet P is skewed. This skew removing method is different depending on the sheet thickness. That is, in the case of a thin cut sheet of plain paper or less, the front end of the cut sheet is slightly bitten between the sub-roller 151 and its driven roller 152a, and then the rollers 151 and 152a are reversed and cut. By bending the cut paper, a method is adopted in which the front ends of the cut paper are aligned and the skew is removed.

  On the other hand, in the case of paper that has been cut thicker than plain paper, the leading edge of the cut paper is abutted against the contact point 151a between the sub-roller 151 and its driven roller 152a, and the paper feed roller 142 is slipped. A method of removing skew by aligning the leading ends of the paper is employed. The amount of biting and the amount of butting are detected by the detection sensor 157a, and the skew removal is controlled according to the detection amount.

  In this way, the skew removal method varies depending on the paper thickness because the thin cut paper is not stiff, and the paper feed roller 142 sends out the cut paper without slipping on the cut paper. This is because the thick cut paper has a structure in which the thin cut paper is bonded, and may peel off when the rollers 151 and 152a are reversed. is there.

  The cut sheet P after the skew removal is sandwiched between the sub-roller 151 and its driven rollers 152a, 152b, and 152c driven by a paper feed motor (not shown) and reversed in the U-shaped path, that is, opposite to the paper feeding direction. Conveyed in the direction. Then, as shown in FIG. 15B, when the leading edge of the cut paper P reaches the detection position DP of the detection sensor 157b, cueing that is a recording start positioning of the cut paper P is performed.

  That is, the leading edge of the cut sheet P is conveyed by the detection sensor 157b from the detection position DP until it reaches the cueing position HP shown in FIG. 16A through between the paper feed roller 153 and the driven roller 154. The amount is detected, and cueing is controlled according to the detected amount. The conventional cueing is performed by the detection sensor 157a disposed on the upstream side of the sub-roller 151, but this cueing is performed by the detection sensor 157b disposed on the downstream side of the sub-roller 151. The amount can be reduced, and particularly the cueing error due to the paper thickness can be eliminated and the cueing accuracy can be improved.

  After that, the cut sheet P for which the cueing has been completed is nipped by a paper feed roller 153 driven by a paper feed motor (not shown) and its driven roller 154 and conveyed to the recording unit 160. Therefore, the nipping of the cut paper P by the sub roller 151 and its driven rollers 152a, 152b, and 152c causes the conveyance accuracy to deteriorate. Therefore, as shown in FIG. 16B, each driven roller 152a, 152b, and 152c. Releases from the sub-roller 151.

  The cut sheet P to be conveyed is sucked and flattened on a platen 163 by a suction pump (not shown), and is recorded by a recording head 162 mounted on a carriage 161 that is scanned by a carriage motor and a timing belt (not shown). . The control unit of the ink jet printer 100 supplies each color ink from a total of seven ink cartridges, for example, yellow, light yellow, magenta, light magenta, cyan, light cyan, and black, to the recording head 162, and discharge timing of each color ink. In addition, the driving of the carriage 161 and the paper feed roller 153 is controlled to execute highly accurate ink dot control, halftone processing, and the like. Then, the cut sheet P for which recording has been completed is sandwiched between a sheet discharge roller 155 and a notch roller 11 driven by a sheet feed motor (not shown), and is discharged to the sheet supply / discharge unit 140, and the sheet supply / discharge tray 200. Are stacked on the paper discharge tray 230.

  In the above-described embodiment, the driven roller unit 60 including the roller holder 61 made of plastic and the holder frame 62 made of metal has been described. However, the driven roller unit 60 can be similarly applied if it is made of different materials. Further, the fixing portions 65 and 66 are not limited to screw fastening, and can be similarly applied to, for example, rivet coupling or pin coupling. Moreover, it is not limited to the driven roller unit 60, For example, it is applicable similarly if it is the coupling body provided with the elongate attachment member and elongate to-be-attached member which were formed with the different material.

  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 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. FIG. 2 is a perspective view of a paper supply / discharge tray of the printer of FIG. 1. It is a perspective view which shows the usage condition of the paper supply / discharge tray of FIG. It is a perspective view which shows another usage pattern of the paper supply / discharge tray of FIG. FIG. 2 is a cross-sectional side view illustrating an outline of an internal configuration of the printer of FIG. 1. FIG. 2 is a diagram illustrating a contact state between a sheet on a hopper of the printer in FIG. 1 and a sheet feeding roller. FIG. 2 is a plan view, a front view, and a perspective view showing a detailed configuration of a driven roller unit of the printer of FIG. 1. It is a perspective view which shows the detail of the roller holder of FIG. It is a top view which shows the detail of the roller holder of FIG. It is a 1st perspective view which shows the drive mechanism of the driven roller and support rib of the printer of FIG. FIG. 6 is a second perspective view showing a driven roller and a support rib driving mechanism of the printer of FIG. 1. FIG. 11 is a schematic three-view diagram of FIG. 10. It is a figure which shows concretely the switching state of the driven roller of FIG. 10, and a support rib. It is a figure which shows the switching state of the driven roller and support rib of FIG. 10 corresponding to the attribute of a paper. FIG. 2 is a first diagram illustrating a paper conveyance state of the printer of FIG. 1. FIG. 4 is a second diagram illustrating a paper conveyance state of the printer of FIG. 1.

Explanation of symbols

11 Grated roller, 12 Roller, 13 Release part, 14 Switching shaft, 15 Frame, 21 Rib, 22 Switching shaft, 30 Gear mechanism, 60 Driven roller unit, 61 Roller holder, 62 Holder frame, 63, 64 Mounting part, 65, 66 Fixed section, 67 Flexible section, 100 Inkjet printer, 101 Housing, 104 Cartridge storage section, 105 Cartridge cover, 110 Operation section, 111 button, 112 LCD panel, 130 Paper feed section, 140 Feed / discharge section, 141 Hopper, 142 Feed roller, 143 Separating member, 150 Conveying unit, 151 Sub roller, 152a, 152b, 152c Driven roller, 153 Paper feed roller, 154 Driven roller, 155 Discharged roller, 156 Driven roller, 160 Recording unit, 161 Carriage, 162 Recording head, 63 platen, 163a recording guide surface, 163b slit 164 supporting ribs 200 sheet discharge tray, 210 paper feed tray 230 paper discharge tray

Claims (8)

A medium transport apparatus comprising a roller for discharging a transport medium, a long holding member for holding the roller, and a long attachment member to which the holding member is attached,
The holding member and the attachment member are formed of different materials, and the holding member and the attachment member are fixed at two positions with a predetermined interval in the longitudinal direction, and a flexible portion is provided at one of the fixing portions. A medium conveying device provided. The medium conveying apparatus according to claim 1, wherein the flexible portion is flexible only in a direction connecting the two fixed portions. The medium conveying apparatus according to claim 1, wherein when the holding member is attached to the attachment member, the holding member is in contact only at the two fixed portions. The flexible part has a product flexibility of a distance between the two fixed parts, a difference in thermal expansion coefficient between the holding member and the mounting member, and a temperature difference in a use environment. The medium carrying device according to any one of claims 1 to 3. The flexible portion extends from the main body of the holding member in a direction orthogonal to the flexible direction and is formed in a beam shape that holds both sides of the fixing portion. 5. The medium conveyance according to claim 1, wherein the flexible portion is bent with respect to the fixed portion to absorb a difference in expansion and contraction between the holding member and the mounting member. apparatus. 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. A combined body comprising a long attachment member and a long attachment member formed of different materials,
A combined body, wherein the attachment member and the member to be attached are fixed at two positions with a predetermined interval in the longitudinal direction, and a flexible part is provided at one of the fixed parts.

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