JP2006205606A - Medium holding means and recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medium holding means which facilitates setting and exchange of a rolled recording medium, and ensures highly accurate recording operation on the rolled recording medium, and to provide a recording device and a liquid ejection device equipped with the medium holding means. <P>SOLUTION: In the medium holding means 132, abutting portions 134c thereof are each formed so as to generate frictional force larger than force in a direction around an axis, occurring when the rolled recording medium is rotated, even if the frictional force occurring at the time of drawing/fitting the rolled recording medium from/to the medium holding means. Thus the rolled recording medium fitted to the medium holding means can be easily drawn from the same, and the rolled recording medium is prevented from slipping out of the medium holding means or from idle running during rotation of the rolled recording medium. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a medium holding unit that integrally and rotatably holds a roll-shaped recording medium, a recording apparatus including the medium holding unit, and a liquid ejecting apparatus.

  In general, an ink jet printer that is one of the conventional recording apparatuses includes a paper supply unit that supplies a recording roll paper, for example, a recording medium, a recording unit that records information on the supplied roll paper, A paper discharge unit for discharging the roll paper is provided. When using such an ink jet printer, the user stores the roll paper in the paper feeding unit and pulls out the leading end of the roll paper. Then, the leading end portion of the roll paper is passed over the paper feed guide and is sandwiched between the paper feed roller and the driven roller to start the ink jet printer. Then, the ink jet printer records information on the roll paper by ejecting ink droplets from the nozzles of the recording head while rotating the paper feed roller to feed the roll paper onto the platen. Then, the paper discharge roller is rotated to discharge the roll paper to the paper receiver through the paper discharge guide.

  Here, when the user stores the roll paper in the paper feeding unit, usually, the spindle is inserted through the hollow shaft portion of the roll paper shaft, and a pair of flanges are fitted to both ends of the spindle and the shaft core is inserted. Fit into both ends, and suspend both ends of the spindle from the bearings of the paper feed unit. At this time, if the fitting force acting between the flange and the roll paper shaft core is too large, a large force is required to remove the roll paper shaft core from the flange. Efficiency deteriorates. On the other hand, if the fitting force acting between the flange and the roll paper shaft core is too small, the roll paper shaft core will come off the flange during recording, or the roll paper will lose the back tension on the roll paper during recording. There is a possibility that recording may be impossible due to the paper slipping. Therefore, as a means for solving such a problem, a flange provided with a screw or a spring for adjusting a fitting force acting between the flange and the roll core is proposed (see Patent Document 1).

Japanese Utility Model Publication No. 60-122738

  The conventional flanges with screws and springs described above require time and effort to adjust the fitting force acting between the roll paper shaft core, are heavy and difficult to handle, and are expensive in terms of cost. There is a problem of becoming.

  The present invention has been made in view of the various problems as described above, and an object of the present invention is to enable easy setting and replacement of a roll-shaped recording medium and to maintain high-precision recording of the roll-shaped recording medium. It is an object of the present invention to provide a medium holding unit that can perform recording, a recording apparatus including the medium holding unit, and a liquid ejection apparatus.

  In order to achieve the above object, the medium holding means of the present invention has contact portions that are respectively fitted to both end portions of the hollow shaft portion of the roll-shaped recording medium and contact with the inner peripheral surface. A pair of medium holding means for rotatably holding the roll recording medium, wherein the contact portion rotates the roll recording medium even if the frictional force when inserting and removing the roll recording medium is reduced. It is characterized in that it is formed into a shape that generates a frictional force that is greater than the force in the direction around the axis. Thus, the roll-shaped recording medium fitted in the medium holding means can be easily pulled out, and the roll-shaped recording medium fitted in the medium holding means can be removed from the medium holding means during rotation. It is possible to prevent a situation where the recording medium comes off or idles.

  Further, the contact portion is easily bent by a rotational moment about the circumferential direction generated when the roll-shaped recording medium is fitted, and is bent by a moment around the axis generated when the roll-shaped recording medium is rotated. It is characterized by being formed in a difficult shape. As a result, the frictional force acting between the abutting portion of the medium holding means and the inner peripheral surface of the hollow shaft portion of the roll-shaped recording medium is larger than the force around the axis generated when the roll-shaped recording medium is rotated. In this way, the force for inserting and removing the roll-shaped recording medium can be adjusted to a small value.

  Further, a plurality of the contact portions are formed at equal intervals around the axis. Thus, the contact force of the contact portion of the medium holding means can be applied evenly to the inner peripheral surface of the hollow shaft portion of the roll-shaped recording medium. Eccentricity can be prevented. Further, the abutting portion has a plate shape extending in the axial direction and the direction around the axis, and is formed in a cantilever shape in which a part of the end portion is fixed. As a result, the contact portion of the medium holding means is easily bent by a rotational moment about the circumferential direction generated when the roll-shaped recording medium is fitted, and the moment around the axis generated when the roll-shaped recording medium is rotated. It can be made difficult to bend.

  In order to achieve the above object, the recording apparatus of the present invention is a recording apparatus capable of recording on a roll-shaped recording medium, and includes the above-described medium holding means. In order to achieve the above object, the liquid ejecting apparatus of the present invention is a liquid ejecting apparatus that ejects a liquid onto a medium to be ejected, and includes the above-described medium holding means. Thereby, a recording apparatus or a liquid ejecting apparatus that exhibits the above-described effects can be provided.

  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 type large-sized printer that can record on a relatively large size so-called cut paper or roll-shaped paper such as JIS standard A2 size or US / C standard 17 inch. The whole is covered with a substantially rectangular parallelepiped housing 101 extending in the width direction.

  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. 11) 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 feeding unit 130 that feeds a roll-shaped paper including the characteristic part of the present invention is disposed so as to protrude rearward from the upper part. Inside the paper supply unit 130, a roll paper holder (medium holding means) 132 (see FIG. 2 and the like), which is a characteristic part of the present invention capable of setting one roll-shaped paper, is disposed. On the front surface of the paper section 130, a flip-up roll paper cover 131 that can be opened and closed is attached so as to cover the roll paper holder 132. The upper surface of the roll paper cover 131 is formed as a paper feed guide surface capable of manually feeding and feeding the cut paper. 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. The detailed structure of the roll paper holder 132 will be described below with reference to FIGS.

  FIG. 2 is a perspective view showing a state in which roll-shaped paper is set in the roll paper holder 132, and FIG. 3 is a perspective view showing the setting process. The roll paper holder 132 includes a roll paper spindle 133 and a pair of roll paper flanges 134 fitted to both ends of the roll paper spindle 133. The roll paper spindle 133 is inserted into the hollow shaft portion of the roll-shaped paper R. The roll paper flange 134 is fitted into both ends of the hollow shaft portion of the roll-shaped paper R into which the roll paper spindle 133 is inserted.

  First, as shown in FIG. 3A, the user pulls out one roll paper flange 134 fitted in the roll paper spindle 133 from one end of the roll paper spindle 133. Then, as shown in FIG. 3B, the other end of the roll paper spindle 133 is inserted through the hollow shaft portion of the roll paper spindle 133 through the hollow shaft portion of the roll paper spindle 133. The roll paper flange 134 is fitted into the boss part 134a and brought into contact with the flange part 134b. Next, as shown in FIG. 3C, the one rolled paper flange 134 is inserted from one end of the roll paper spindle 133, and the boss part 134a is fitted into the hollow shaft part of the roll paper R. The flange part 134b is brought into contact.

  Then, the rolled paper R is held together with the roll paper holder 132, and both ends of the roll paper spindle 133 are suspended on two spindle receivers (not shown) disposed at both ends of the paper feeding unit 130. Thereby, the roll-shaped paper R can be rotatably held integrally with the roll paper holder 132. A torque limiter 133 a is attached to one end of the roll paper spindle 133. As a result, the roll-shaped paper R does not rotate unless a certain amount of torque is applied to the roll-shaped paper R, so that a situation where the roll paper is unwound can be prevented.

  FIG. 4 is a perspective view showing details of the roll paper flange 134. Since the pair of roll paper flanges 134 have the same shape, only one of them is shown here. The roll paper flange 134 has a structure in which a boss part 134a is integrally formed on one surface side of the flange part 134b. The boss 134a is formed in a hollow cylindrical shape, and the end of the hollow shaft portion of the roll-shaped paper R is fitted on the outer peripheral side, and the end of the roll paper spindle 133 is fitted on the inner peripheral side. ing.

  A plurality of (four in this example) ribs extending in the axial direction for guiding the insertion of the roll-shaped paper R into the end of the hollow shaft portion and holding the end from the inside are provided on the outer peripheral surface of the boss portion 134a. (Abutting portions) 134c are integrally formed at equal intervals in the direction around the axis. By using the roll paper flange 134 having such a configuration, the fitting force acting between the rib 134c of the boss portion 134a and the hollow shaft portion of the roll-shaped paper R can be set to an appropriate value. The description will be given with reference.

  5 to 7 are a perspective view of the details of the rib 134c as seen from the right direction, a plan view, and a perspective view as seen from the left direction. The rib 134c has a substantially rectangular plate-like base portion 134d that extends in the axial direction and the direction around the axis on the outer peripheral surface of the boss portion 134a, and the base portion 134d with the base portion 134d floating at a predetermined interval from the outer peripheral surface of the boss portion 134a. It is formed in a cantilever shape having a fixing portion 134e for fixing one end portion.

  That is, a corner portion of the lower left front end of the base portion 134d is integrated and fixed by a fixing portion 134e that stands substantially perpendicular to the outer peripheral surface on the distal end side of the boss portion 134a. At the upper right edge of the base portion 134d, the guide inner portion 134f that guides the inner peripheral surface of the hollow shaft portion of the roll-shaped paper R and holds the inner peripheral surface of the end portion protrudes outward. Has been. An inclined guide surface 134fa and a holding surface 134fb having a gentler inclination than the guide surface 134fa are formed on the upper surface of the guide holding portion 134f.

  Such a rib 134c bends to a rotational moment (arrow Ma shown in the figure) about the circumferential direction generated when the end of the hollow shaft portion of the roll-shaped paper R is fitted along the upper surface of the guide holding portion 134f. It is formed in a shape that is easy to bend and is not easily bent by a moment around the axis (arrow Mb in the drawing) generated when the roll-shaped paper R is rotated for use. According to such a structure, the rib 134c has a small frictional force when inserting / removing the end of the hollow shaft portion of the roll-shaped paper R, and a force around the axis generated when the roll-shaped paper R is rotated. A larger frictional force can be generated.

  That is, the guide surface 134fa of the guide holding portion 134f guides the inner peripheral surface of the end of the hollow shaft portion of the roll-shaped paper R, and at that time, the base portion 134d is greatly elastically deformed in the rotation direction about the circumferential direction. Therefore, not only fitting of the roll-shaped paper R into the end portion of the hollow shaft portion but also drawing is facilitated. When the holding surface 134fb of the guide holding portion 134f holds the inner peripheral surface of the end of the hollow shaft portion of the roll-shaped paper R, the base portion 134d is not easily displaced in the direction around the axis. The end of the hollow shaft is firmly held to prevent feeding errors.

  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 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 shape, and cut sheets to be fed before recording are stacked and housed therein, and cut sheets to be discharged after recording or roll-shaped in the upper part. Sheets are stacked and placed. The detailed structure of the sheet supply / discharge tray 200 will be described below with reference to FIGS.

  FIG. 8 is a perspective view of the entire external configuration of the paper supply / 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.

  FIG. 9 and FIG. 10 are perspective views showing the paper supply / discharge unit 140 to which the paper supply / discharge tray 200 is mounted. When the cut sheets are stacked and loaded, as shown in FIG. 9, 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. 11) has a side surface and a bottom surface of the guide portion 145 having an L-shaped cross section and the 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 sheets, as shown in FIG. 10, on the other long side of the first guide plate 241 of the roll paper guide 240 stored on the upper surface of the paper 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. 11 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 transport unit 150, a recording unit 160, and the like are arranged. The paper feed / discharge unit 140 is provided with a hopper 141 for feeding cut paper, a paper feed roller 142, a separation member 143, a paper return lever (not shown), and the like.

  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. The sheet feeding tray 210 is disposed so as to be close to the bottom surface. 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. The paper return lever returns the separated lower layer paper onto the hopper 141.

  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, a jagged roller 156, and a detection sensor 157a for detecting the paper. 157b 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 unit 130 to the paper ejection tray 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 sandwiches the paper passing through the platen 163 together with the jagged roller 156 and discharges the paper 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, and the like are disposed. The carriage 161 is connected to a carriage belt (not shown). When the carriage belt is actuated by a carriage driving device (not shown), the carriage 161 is entrained by the movement of the carriage belt and is guided by a guide shaft (not shown) to reciprocate. .

  The recording head 162 is, 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 colors of yellow, dark yellow, cyan, light cyan, magenta, and light magenta. And a recording head. The recording head 162 is provided with a pressure generating chamber and a nozzle opening connected to the pressure generating chamber. The size of the recording head 162 is controlled from the nozzle opening toward the sheet by storing ink in the pressure generating chamber and pressurizing the ink with a predetermined pressure. Ink droplets are discharged.

  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 which is the upper surface thereof. The recording guide surface of the platen 163 is provided with an ink absorber (not shown) that absorbs ink that has been removed from the side edge of the paper during borderless printing. As a result, useless ink can be collected, so that contamination of the paper by useless ink can be prevented. Further, a suction hole (not shown) for sucking the sheet to the recording guide surface of the platen 163 is formed. As a result, the distance between the nozzle forming surface of the recording head 162 and the recording surface of the paper can be kept constant, so that high recording accuracy can be maintained.

  An operation in the case where recording is performed on a roll-like paper in the ink jet printer 100 in such a configuration will be described. First, the user loads a roll-shaped sheet on the roll sheet holder 132 and loads it into the sheet feeding unit 130. Then, the leading end of the roll-shaped paper is pulled out and abutted against the contact portion between the paper feed roller 153 and the driven roller 154. Then, skewing and cueing of the roll-shaped paper are performed.

  The roll-shaped paper for which skew removal and cueing are 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. The conveyed roll-shaped paper is sucked and flattened on the platen 163 by a suction pump, and is recorded by a recording head 162 mounted on a carriage 161 scanned by a carriage motor and a carriage belt.

  At this time, the control unit 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 and the carriage 161 and The driving of the paper feed roller 153 is controlled to execute highly accurate ink dot control, halftone processing, and the like. Then, the roll-shaped paper on which recording has been completed is cut and discharged to the paper supply / discharge unit 140 by a paper discharge roller 155 driven by a paper feed motor (not shown), on the paper discharge tray 230 of the paper supply / discharge tray 200. Is stacked.

  As described above, according to the roll paper holder 132 of the present embodiment, the rib 134c formed integrally with the boss portion 134a of the roll paper flange 134 reduces the frictional force when inserting and removing the roll-shaped paper. In addition, since it is formed in a shape that generates a frictional force that is greater than the axial force generated when the roll-shaped paper is rotated, the roll-shaped paper that is fitted in the boss portion 134a of the roll paper flange 134 is formed. The roll paper can be easily pulled out, and the roll paper can be prevented from slipping out or idling from the boss part 134a of the roll paper flange 134 during the rotation of the roll paper.

  Further, the rib 134c is formed in a shape that is easy to bend due to a rotational moment about the circumferential direction generated when the roll-shaped paper is fitted, and is difficult to be bent due to a moment around the axis generated when the roll-shaped paper is rotated. Therefore, the frictional force acting between the upper surface of the rib 134c and the inner peripheral surface of the hollow shaft portion of the roll-shaped paper is larger than the force around the axis generated when the roll-shaped paper is rotated. In this way, the force for inserting and removing the roll-shaped paper can be adjusted to be small.

  Further, since a plurality of ribs 134c are formed at equal intervals around the axis, the contact force of the ribs 134c can be applied evenly to the inner peripheral surface of the hollow shaft portion of the roll-shaped paper, and the roll paper flange 134 The eccentricity of the shaft center of the roll-shaped paper with respect to the shaft center can be prevented. And since the inclined guide surface 134fa is formed in the rib 134c, the dispersion | variation in the internal diameter of the hollow shaft part of a roll-shaped paper can be absorbed. Further, since the rib 134c is structured to be easily displaced toward the holding surface 134fb formed at the back, the rib 134c is easily adapted to the inner peripheral surface of the hollow shaft portion of the roll-shaped paper.

  Further, the rib 134c has a plate shape extending in the axial direction and the direction around the axis, and is formed in a cantilever shape in which a part of the end portion is fixed. It is easy to bend by the rotational moment about the circumferential direction, and it is difficult to bend by the moment in the direction around the axis generated when the roll-shaped paper is rotated.

  Any recording apparatus provided with a medium holding means can be applied to, for example, a facsimile apparatus, a copying apparatus, and the like. 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 illustrating a state in which roll-shaped paper is set in a roll paper holder of the printer in FIG. 1. It is a perspective view which shows the setting process of FIG. It is a perspective view which shows the detail of the roll paper flange of the roll paper holder of FIG. It is the perspective view which looked at the detail of the rib of the roll paper flange of FIG. 4 from the right direction. It is the perspective view seen from the top view and the left direction. It is a top view of the detail of the rib of the roll paper flange of FIG. It is the perspective view which looked at the detail of the rib of the roll paper flange of FIG. 4 from the left direction. 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.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Inkjet printer, 101 Housing, 104 Cartridge storage part, 105 Cartridge cover, 110 Operation part, 111 Button, 112 Liquid crystal panel, 130 Paper feed part, 132 Roll paper holder, 133 Roll paper spindle, 134 Roll paper flange, 134a Boss Part, 134b flange part, 134c rib, 134d base part, 134e fixing part, 134f guide holding part, 134fa guide surface, 134fb holding surface, 140 paper supply / discharge part, 141 hopper, 142 paper feed roller, 143 separation member, 150 transport part , 151 Sub-roller, 152a, 152b, 152c Driven roller, 153 Paper feed roller, 154 Driven roller, 155 Discharge roller, 156 Gagged roller, 160 Recording unit, 161 Carriage, 162 Recording head, 163 Platen , 200 Feed / discharge tray, 210 Feed tray, 230 Discharge tray

Claims (6)

A pair of medium holding means that have contact portions that are respectively fitted to both ends of the hollow shaft portion of the roll-shaped recording medium and that contact the inner peripheral surface, and hold the roll-shaped recording medium integrally and rotatably. There,
The contact portion has a shape that generates a frictional force that is greater than the axial force generated when the roll-shaped recording medium is rotated even if the frictional force when the roll-shaped recording medium is inserted / removed is reduced. A medium holding means formed. The abutment portion is easy to bend due to a rotational moment about the circumferential direction generated when the roll-shaped recording medium is fitted, and is difficult to bend due to a moment around the axis generated when the roll-shaped recording medium is rotated. The medium holding means according to claim 1, wherein the medium holding means is formed as follows. The medium holding unit according to claim 1, wherein a plurality of the contact portions are formed at equal intervals around the axis. The said contact part is a plate shape extended in an axial direction and an axial periphery direction, Comprising: It forms in the cantilever shape to which a part of edge part was fixed, The any one of Claims 1-3 characterized by the above-mentioned. The medium holding means according to claim 1. A recording apparatus capable of recording on a roll-shaped recording medium,
A recording apparatus comprising the medium holding unit according to claim 1. A liquid ejecting apparatus that ejects liquid onto an ejection target medium,
A liquid ejecting apparatus comprising the medium holding unit according to claim 1.

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