JP2006168839A - Sheet housing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet housing device capable of separating each sheet to be fed, and a feeder using that, comprising a pickup roller to press the uppermost sheet to be fed, in which stable feeding is realized even when a cassette housing curled lamination sheets is charged. <P>SOLUTION: This sheet housing device, housing unused sheets in stack, or a sheet feeder using that, is provided with a means protruded to a floor surface of the housing device in a perpendicular direction to the sheet curling direction roughly along the sheet center line, and a means to press a sheet layer at both end parts at a rear end from above the stack of sheets. By so providing flexure in the counter-curling direction, the sheet attitude is corrected. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sheet storage device and a sheet feeding device that sequentially separate and feed sheet materials stacked and accommodated in a sheet storage unit one by one using a sheet material feeding unit. More specifically, the present invention relates to a sheet storage device having a sheet feeding device used for an image recording apparatus such as a printer.

  Conventionally, as an image recording apparatus using this type of sheet feeding apparatus, there is an ink jet recording apparatus that performs recording by discharging a recording liquid (ink) onto a recording medium (Patent Document 1).

  FIG. 12 is a schematic cross-sectional view of an inkjet image recording apparatus provided with the paper feeding device. Here, as an example of the image recording apparatus, an ink jet image recording apparatus that forms characters or images on a recording sheet by ejecting ink according to print data will be described.

  The inkjet image recording apparatus 100 includes a paper feeding device 101 and an image recording unit 120. The sheet feeding device 101 is separated by a sheet storing unit 112 that stores unused sheets 111 that are stacked and stored, a sheet feeding device 101 that feeds out the sheets 111 from the sheet storing unit 112, and the sheet feeding device 101. And a pair of conveying rollers (sheet conveying means) 113 for conveying the sheet 111 fed out. The sheet feeding apparatus 101 will be described later.

  One sheet 111 fed out by the sheet feeding apparatus 101 is fed rightward in the drawing while being guided by a guide plate 114 that forms a sheet conveyance path. The guide plate 114a is a substantially semicircular curved path portion that changes the traveling direction of the sheet 111 conveyed in the right direction to the upper left direction, and guides the sheet 111 between the conveyance rollers 113 provided in the conveyance path. Further, a straight path portion 114b that is provided continuously to the curved path portion 114a and guides the sheet 111 that has been changed in course by about 180 degrees is disposed at the outlet of the conveying roller 113. After the sheet is inserted between the conveyance rollers 113, the conveyance rollers 113 are driven to rotate and are guided by the straight path portion 114 b of the guide plate 114. At the outlet of the guide plate 114, two sets of sub-scanning rollers 123 and 124 that convey the sheet 111 intermittently by a predetermined amount in the left direction at the time of image formation are provided apart from each other. An ink jet recording head (image recording unit) 121 and a platen plate 125 are disposed between the sub scanning rollers 123 and 124.

  The ink jet recording head 121 is mounted on a carriage (not shown), and this carriage is arranged in the conveyance direction of the sheet 111 by a carriage guide (not shown) arranged substantially parallel to the rotation axes of the sub-scanning rollers 123 and 124. It is held so as to be movable in a substantially orthogonal direction. The carriage is moved when the intermittent conveyance of the sub-scanning rollers 123 and 124 is stopped. At this time, ink is ejected from the ink jet recording head 121 onto the sheet 111 guided onto the platen plate 125 to form an image. Done. During printing, the conveyance roller pair 113 is separated to release the sheet, thereby reducing the conveyance resistance and obtaining a higher-definition output image.

  A discharge tray 126 is provided at the exit of the sub-scanning roller 124, and after the image forming operation is completed, the sheet 111 discharged from the sub-scanning roller 124 is placed thereon.

  The ink jet recording head 121 is connected to an on-carriage tank 122 that stores ink supplied thereto, and the on-carriage tank 122 is placed on the carriage together with the ink jet recording head 121.

  When printing on a sheet of the same size after printing is completed, conveyance and printing are performed in the same procedure.

  Incidentally, as a sheet storing / feeding device used in the above apparatus, there is a sheet feeding apparatus 101 as shown in FIGS. The sheet feeding apparatus 101 sequentially supplies the sheet material 111 one by one toward the image recording unit in the next process. As shown in FIG. 13, the sheet feeding apparatus 101 includes a pickup roller 102 that feeds the uppermost sheet material 111 one by one from a sheet storage unit 112 in which a plurality of sheets are stacked and stored in a flat state. ing.

  The pickup roller 102 is controlled so as to be able to enter the sheet storage means 112 so as to be swingable about a fulcrum shaft (not shown), and is rotationally driven so as to be brought into contact with the uppermost sheet and fed forward (rightward in the figure). To do. In front of the fed sheet, there is provided a tilting member 112a which is the leading edge of the sheet storing means 112 and changes the leading end of the sheet obliquely upward with an appropriate tilt angle. By finishing the sheet contact surface of the inclined member 112a with a predetermined resistance roughness, even if a plurality of sheets are fed out, the sheet leading to the sheet leading edge due to a synergistic effect with the inclination angle while giving conveyance resistance to the second and subsequent sheets. Separation performance is improved by a so-called bank separation method in which the rolling operation is performed.

The sheet material 111 separated and fed by the pickup roller 102 is transported downstream for transport to the recording unit. Further, a conveyance roller pair 113 is also provided on the downstream side. A guide 114a is arranged to guide a sheet material conveyance path formed by the pickup roller 102. A guide group 114b is arranged between the conveyance roller pair 113 and the image recording unit, and the sheet 111 is guided respectively. It is configured as follows. An apparatus has been used in which sheets are separated from a laminated sheet using the sheet storage unit and the sheet feeding unit configured as described above, and the sheets are sequentially taken out one by one and sent to a recording unit or an image reading unit.
Japanese Patent Laid-Open No. 2004-075242

  In recent years, with the development of image forming technology, it has become possible to record print information on various recording media. For example, in heat-sensitive printers and transfer-type sublimation printers that directly develop colors when heat is applied to a print medium, special paper specialized for image forming apparatuses has been used. For example, LBP ( Electrophotographic printers and inkjet printers typified by laser beam printers) can record on a wide variety of media from plain paper to sheet films such as OHP (overhead projector) sheets. Accordingly, the operator can output recording information such as character information and images to a desired reflection medium or transmission medium using the same image forming apparatus.

  Examples of such a recording medium include glossy paper, OHP transparent sheet, and sealing paper. Recently, a dedicated glossy film or a PET (polyethylene terephthalate) -based film sheet is used to record high-quality images. Are also used. These recording media have various sheet thicknesses and surface finishes depending on the media. In addition, in order to feed and print a sheet size conforming to the print image size, a sheet container loaded in the image forming apparatus is configured to be detachable from the apparatus main body, and the container is arranged according to a desired image. Or, a plurality of container loading openings are provided in the apparatus main body, and printing is executed by feeding a desired sheet by an operator's selection operation.

  In addition, many image forming apparatuses capable of handling large sheet-like recording media have appeared. For example, image forming apparatuses capable of printing on recording sheets of A3 size, A3 size, etc. have become common. At the same time, the recorded image quality is improved as the recording pixel density is increased, so that glossy paper and transparent sheets for recording photographic images are also frequently used.

  These sheets are obtained by forming an image receiving layer for absorbing the applied ink on a base material such as paper material or PET material, and the sheet thickness is also thin such as an OHP sheet, thereby expressing photographic image quality. For this purpose, the image receiving layer is made thick and the base material is made thick in order to realize the tactile sensation of the photographic paper, and the PET base thick sheet similar to the medical X-ray film is used. In addition, there is a sheet in which a coating layer is applied on the upper surface of the image receiving layer in order to improve the long-term storage property of the image receiving layer once recorded or to prevent ink smearing. This coat layer has countless holes formed to allow recording ink to transmit from itself to the image receiving layer, and there are various types of sheets such as a relatively uneven surface. In addition, there is a sheet or the like in which a coating layer is provided on the back surface for the purpose of increasing the water resistance of the back surface. That is, in accordance with a desired drawing image quality, a sheet on which a coating layer having various materials and thicknesses suitable for each is applied on the printing surface or both sides has been developed and recorded.

  Next, a sheet used or stored in an image recording apparatus as shown in the conventional example may be affected by temperature and humidity in the environment, and the fiber and coating material of the sheet may expand and contract. In particular, in the sheet having the characteristics as described above, since the materials of the front surface and the back surface are different, a difference occurs in the amount of expansion / contraction. In other words, a difference occurs in the amount of expansion or contraction between the front surface and the back surface due to the difference in expansion coefficient, resulting in curling. In particular, by increasing the ink absorption amount, in order to express a deeper drawn image with better color developability, if the coating material is thickly coated, the difference in the amount of expansion and contraction on the front and back surfaces will increase and the curl amount will increase. It becomes. Further, in the roll bundle state before the cut sheet is cut and manufactured, the curl ridge formed in the posture along the roll curved surface may potentially remain after the cutting. When such a sheet bundle is loaded on the sheet storage table, the sheet bundle is not set following the surface of the sheet storage table, and the both ends or the center of the sheet are curled up and loaded. The curl direction is also parallel to the conveyance direction of the recording apparatus, or a direction orthogonal thereto, and varies depending on the sheet.

  By the way, as described in the conventional sheet feeding device, a pickup roller type that feeds a sheet by rotating and pressing the uppermost sheet as a sheet feeding means has been used in many apparatuses. The pickup roller oscillates in accordance with a paper feed command and enters the sheet storage unit 112 and presses against the uppermost sheet. Usually, in order to feed out the sheet stably, two or more positions where the roller is pressed against the sheet are provided in the vicinity of both sheet ends. If the sheet layer is curled at this time, the pickup roller is not pressed over the entire width of the roller, but is in a so-called one-contact state where only the corners of the roller are in contact as shown in FIG. If the sheet resistance is not sufficiently transmitted to the sheet and the sheet resistance is won, a sheet feeding slip or non-feed occurs. This phenomenon becomes conspicuous when forming a boat shape in which both end portions in the width direction are lifted with respect to the conveying direction in the sheet curl bundle.

In addition, each sheet in the curl bundle layer is in an attitude of holding a sheet adjacent to the curl direction on the inner side of the curl bundle layer, and the adhesion with the inner sheet is increased. For this reason, there are cases in which the contact force cannot be released and separated into one sheet only by the rolling operation by the inclined member 112a finished with a predetermined resistance roughness, and double feeding occurs.
An object of the present invention is to provide a sheet storage and feeding apparatus that solves the above-described problems of the prior art and has improved sheet separation performance and sheet feeding performance.

  Means according to the present invention for achieving the above object is a sheet storage device in which unused sheets are stacked and stored, and a sheet feeding device using the same, in a direction orthogonal to the sheet curl direction, A sheet storage device having means for imparting deflection in a curl direction and correcting a sheet posture.

  By providing the convex member 14 and the pressing member 16 that bend the curl sheet provided on the floor surface of the sheet storage device in a direction orthogonal to the curl, the roller driving force can act stably and is not fed. In addition, it is possible to prevent double feeding and to perform a smooth paper feeding operation with a small transport load.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to examples.

(First Example)
Hereinafter, an embodiment of a sheet feeding apparatus according to the present invention will be described with reference to the drawings. In this embodiment, the ink jet recording apparatus shown in the above-described conventional example will be described as an example of an image recording apparatus equipped with the sheet feeding apparatus.

  Similar to the above, FIG. 1 is a schematic cross-sectional view of an ink jet image recording apparatus provided with the paper feeding device. Note that members represented by the same reference numerals as described above have the same functions.

  The inkjet image recording apparatus 50 includes a sheet feeding device 40 and an image recording unit 120. The sheet feeding device 40 separates and feeds out the sheet 1 from the sheet storage device 2 that stores the unused sheets 1 that are stacked and stored, and is conveyed by the conveyance roller 113 while being guided by the guide plate 114, and then the image recording unit 120. It is configured to send to.

  A sheet 1 fed out by the sheet feeding device 40 is guided by a substantially semicircular curved path portion of a guide plate 114a that forms a sheet transport path, and is transported by a transport roller 113 provided along the transport path. In response to the driving, the course is changed by approximately 180 degrees. Subsequently, the guide plate 114 is inserted into the two sets of sub-scanning rollers 123 and 124 that are intermittently conveyed by a predetermined amount while being guided by the straight path portion 114b of the guide plate 114, and the sub-scanning process is performed. During printing, the conveyance roller pair 113 is configured to be separated to release the sheet in order to reduce conveyance resistance. The ink jet recording head 121 is mounted on a carriage (not shown), and the carriage is substantially arranged in the conveyance direction of the sheet 1 by a carriage guide (not shown) arranged substantially parallel to the rotation axes of the sub-scanning rollers 123 and 124. Ink is ejected from the inkjet recording head 121 onto the sheet 1 that is mounted so as to be movable in the orthogonal direction and guided onto the platen plate 125, and image formation is performed. After printing is completed, the recorded sheets 1 are sequentially stacked and discharged onto the discharge tray 126.

  Next, the sheet storage device 2 and the paper feeding device 40 used in the above apparatus are shown in FIGS. The sheet storage device 2 and the sheet feeding device 40 cooperate to perform a separation and feeding process, and sequentially supply the sheet material 1 one by one toward the image recording unit in the next process.

  As shown in FIG. 3, the sheet storage device 2 encloses an unused laminated sheet layer 1 using a partition plate (not shown) or a side wall of the storage device itself so that the sheet side ends are aligned.

  The leading edge of the sheet storage device 2 is provided with an inclined surface 2a that is in front of the fed sheet and has an appropriate inclination angle and turns the leading edge of the sheet obliquely upward. Further, the inclined surface 2a is provided with a resistance member 11 having a surface having a desired resistance at a position corresponding to the corner of the sheet from the lower end to the upper end edge. Further, the resistance member 11 protrudes slightly toward the sheet side from the other inclined surface 2a, so that the resistance member 11 is configured to preferentially contact when the sheet leading edge contacts the inclined surface. On the floor surface of the sheet storage device 2, a friction pad 12 is attached to a portion corresponding to the pressure contact position of the pickup roller. The friction pad 12 is in contact with the lowermost sheet, and the transition of the lower sheet layer other than the sheet to be fed is restricted by the frictional force generated by the pressure contact. Thereby, for example, the accompanying sheet feeding accompanying the first sheet feeding of the second sheet separated by the bank separation surface as shown in FIG. 4 is prevented.

  The floor surface of the sheet storage device 2 is substantially in the center with respect to the conveying direction of the stacked sheets, and is rearward from the vicinity of the sheet pressing position of the pickup roller, and substantially on the center line with respect to the sheet width. A convex member 14 is provided at the position where it is located. The convex member 14 is tiltable with respect to the floor surface, has a horizontally long shape in an upright state, and its upper surface has a gentle slope or R surface in both longitudinal directions from the center of the member, The ridge line portion has a smooth R finish so that the surface of the sheet is not damaged even when the sheet slides. This is shown in FIG. Further, the convex member 14 is disposed at a position that does not exert an excessive load on the driving of the sheet and the pickup roller when the pickup roller is driven and does not affect the sheet feeding operation.

  Further, the convex member 14 is rotatable around a member midpoint. A groove is engraved in a cross in a direction parallel to and orthogonal to the sheet conveying direction on the sheet storage floor surface, and when the convex member 14 stands up, its bottom surface portion is fitted to determine the position. . An urging spring 15 is mounted on the lower surface of the middle point of the convex member 14, and the convex member 14 is positioned in the vertical position (FIG. 7) or in the cross groove in the standing position (FIGS. 8 and 9). The posture is held with an urging force.

  Reference numeral 16 denotes a pressing member 16 that presses the vicinity of the rear end portions on both sides of the uppermost sheet downward, and is provided on a lid that covers the upper surface of the sheet housing case. The pressing member 16 is, for example, a multistage stretchable structure formed by combining a plurality of cylindrical shafts having different thicknesses, and has a stretchable amount enough to reach the bottom surface of the sheet housing case. An urging spring is arranged around the cylindrical shaft, and the sheet is pressed downward with a desired urging force. Further, the surface of the pressing member 16 that contacts the sheet has an appropriate frictional force.

  FIG. 6 shows a state in which the laminated sheets 1 and 1 s are loaded in the sheet storage device 2 having the convex member 14. Here, for example, assuming that the sheets to be stacked are parallel to the conveying direction and curled on the upper surface side, if the convex member 14 is disposed horizontally along the sheet width direction orthogonal to the curl direction, the sheet layer as shown in the figure 1 s is raised at the center by the convex member 14. Further, when both sides of the rear end of the sheet are pressed by the pressing member 16, a substantially boat shape is initially formed, and the pressure contact position surface of the pickup roller is also bent as described above. Due to the effect, the sheet bundle is bent in the direction perpendicular to the boat shape and is bent to the opposite side like a spring back. .

  As shown in FIGS. 2 and 3, the sheet feeding device 40 includes a pickup roller 3 that feeds the uppermost sheet 1 one by one from a sheet storage device 2 in which a plurality of sheets are stacked and stored. It is controlled so as to be able to enter the sheet storage / accommodating apparatus 2 so as to be swingable in the center, and is rotationally driven so as to be brought into pressure contact with the vicinity of the central portion of the uppermost sheet and fed forward. A plurality of the pick-up rollers 3 are preferably arranged at the distributed positions with the center line in the sheet conveyance direction being symmetrical. However, in order to be able to convey a plurality of size sheets, the sheet is often disposed inside the minimum size sheet width, and is substantially provided near the center of the sheet. By driving the pickup roller 3 to rotate, the feeding operation is performed while the front end of the sheet is changed obliquely upward along the guide of the inclined surface 2 a provided at the front end edge of the sheet storage device 2.

  Further, a conveying roller 113 that conveys the fed sheet material 1 toward the image recording unit is provided as a pair with a driven roller that is installed in pressure contact with a predetermined pressure. A guide plate 114a is arranged at the upstream inlet of the pair of conveyance rollers 113, and a guide plate 114b is arranged at the downstream outlet to guide the sheet material conveyance path.

  The sheet separating operation by the curl correction using the sheet storage device and the sheet feeding device having the above-described configuration will be described. As the print command is transmitted to the image recording device 50 together with the image information, the recording device control is performed to perform image recording. The system commands to start the sheet feeding operation, and the pickup roller 3 that was initially waiting above the sheet storage device 2 enters the sheet storage device 2 as shown in FIGS. Abut. Here, even if the sheet layer is curled as described above, due to the synergistic effect of the convex member 14 and the pressing member 16 described above, the roller pressure contact is caused by the action of bending in the direction perpendicular to the curl and the opposite surface. The surface is substantially horizontal, and the roller pair can sufficiently contact the sheet. The sheet 1 is transferred in the direction of the front inclined surface 2a under an appropriate driving force, and the leading end of the sheet is moved to the resistance member 11. Make contact. When the sheet is further conveyed by the pick-up roller 3, the leading edge of the sheet is changed to the upper oblique direction while being guided by the inclination of the inclined surface 2a (substantially the resistance member 11).

  At this time, the corner end of the sheet advances while receiving the conveyance resistance of the surface of the resistance member 11, and this corner is the position farthest from the driving force transmission position of the pickup roller 3 of the sheet. In addition, since the seat is weak and easy to bend, it does not cause buckling of the seat and does not cause roller slip due to resistance as shown in FIG. It will be followed. For this reason, since the front end of the sheet forms a substantially downward convex shape when viewed from the front side in the conveying direction, the sheet is separated into one sheet by creating a gap between the second sheet and the second sheet.

  Moreover, since it progresses while taking in air from the transfer direction front side by taking a substantially downward convex shape, the separation effect is further enhanced. Further, the unevenness of the embossed surface also has an effect of improving the sheeting effect of the sheet tip. On the rear end side, the sheet slides while being moderately braked by the pressing member 16, but at this time, the uppermost sheet receives the driving force of the roller and overcomes the friction braking of the pressing member 16. It is possible to proceed. Here, in the sheet having high smoothness, the adhesion between the sheets is also increased, and the second sheet is conveyed while being slightly shifted in the conveying direction along with the sliding movement of the first sheet. Sending may occur. However, in this apparatus, the pressing member 16 applies braking to the movement, and the roller propulsion force for the second sheet is also small, so that only one sheet can be conveyed, and the frequency of occurrence of double feed is reduced. . Further, since the posture of the sheet is also corrected, the lower layer sheet does not hold the upper layer sheet, and a stable separation operation is performed.

  The sheets separated as described above are subsequently conveyed to the image recording unit by the guide plate 114 and the conveyance roller 113.

  As described above, by providing the convex member 14 and the pressing member 16 that bend the curl sheet provided on the floor surface of the sheet storage device in a direction orthogonal to the curl, the roller driving force can act stably. Thus, it is possible to prevent double feeding and prevent non-feeding, and a smooth paper feeding operation with a small transport load can be performed.

  In the above embodiment, the case where the stacked sheets are curled on the upper surface side in parallel with the conveyance direction has been described. However, when the curl direction is the sheet width direction, the convex member 14 is the above-described one. By rotating and arranging in the orthogonal direction, there is an effect of correcting the roller pressure contact position substantially horizontally. Further, in the case of a sheet layer that is not curled or has a small amount of curl, the convex member 14 can be laid on the floor surface of the housing to accommodate a normal floor plane.

  The separation method is not limited to bank separation, and can be applied to an apparatus using a pressure-contact type pickup roller.

(Other examples)
10 and 11 show modifications of other embodiments according to the present invention. In the first embodiment, a means for performing curl correction on a sheet having a specific size is shown. Here, a configuration corresponding to a plurality of sizes is shown. Normally, when storing sheets, the sheet storage housing is positioned by a partition plate or the like that can move both sides of the sheet. There is a side-by-side placement for positioning a sheet with one side wall as a reference position. In the center placement placement, the center of the sheet is always constant, so the correction member can be arranged on the center line to cope with the configuration of the first embodiment. .

  In FIG. 10, reference numeral 18 denotes a partition plate for adjusting the end face of the sheet, and is integrally connected to the slide movable rack 19 on the back surface of the sheet housing case. FIG. 11 is a view of the rear surface of the sheet housing case seen through from the upper surface side. The slide movable rack 19 is movable in the sheet width direction and meshes with the pinion 20. The pinion 20 is also meshed with a fixed rack 21 arranged in parallel with the slide movable rack, and the center point thereof corresponds to an intermediate point between the casing side wall and the movable partition plate that is a sheet shift reference. Further, the pinion 20 is fitted so that the central axis of the convex member 14 of the above-described embodiment can be rotated at the midpoint, and can be slid by a guide means (not shown) together with a small frame body 22 having a cross groove. It has become.

  In the configuration described above, when sheets of various sizes are loaded in the housing case, the partition plate 18 slides to position the sheet and abuts against the end surface of the sheet, and the opposing end surface also abuts against the reference position. Positioning is performed. At this time, the rack 19 connected to the partition plate 18 on the rear surface of the casing moves by the same amount L, but the pinion 20 always moves by an amount L / 2 that is half of the partition plate by the meshing action with the fixed rack 21. become. Since the pinion 20 is attached to an intermediate point between the partition plate 18 and the side wall reference as described above, even if the partition plate 18 moves, the pinion 20 always maintains the intermediate point. As a result, the convex member 14 interlocked with the pinion 20 is always arranged at the intermediate point between the partition plate 18 and the reference position, that is, the sheet center position. Accordingly, it is possible to apply a correction action to the central abdomen of the curled sheet, and a stable sheet correction is possible. In this embodiment, the sheet width direction has been described. Needless to say, the same structure can be used for the sheet conveyance direction. Further, not only the convex member 14 but also the pressing member 16 attached to the lid body can always keep the center distribution relation with respect to the sheet by the same mechanism.

  In addition, when the sheet size is limited in advance, instead of configuring the convex member 14 to be rotatable as described above, means such as a mounting hole for mounting the convex member 14 on the floor surface of the housing is provided. It is also possible to mount mounting pins or the like on the mounting surface side of the convex member 14 and mount them according to each sheet size or curl direction. Thereby, it becomes realizable with a simple structure.

  Further, the convex member 14 and the pressing member 16 may be arranged not on the sheet housing but on the main body sheet feeding apparatus side. In this case, it is possible to cope by providing means for detecting the sheet size and arranging various members at positions corresponding to the size. In that case, the sheet housing case becomes simple, and the sheet loading property and the case handling property are improved.

  The pressing member 16 is not limited to a stretchable multistage structure, and may be a structure in which a sponge-like flexible member is packed inside and the surface is covered with an appropriate friction member such as a rubber belt. The flexible member can apply an appropriate pressing pressure to the sheet surface and can cope with the number of laminated sheet layers. With this configuration, the same effect as in the above-described embodiment can be obtained with a relatively inexpensive configuration.

Sectional drawing which shows schematic structure of the image recording apparatus which concerns on 1st Example. Sectional drawing which shows schematic structure of the sheet feeding apparatus which concerns on 1st Example. The perspective view which shows schematic structure of the sheet | seat accommodation apparatus which concerns on 1st Example. The perspective view which shows the sheet feeding operation | movement of the sheet storage apparatus and sheet feeding apparatus which concern on 1st Example. The perspective view which shows the structure of the sheet | seat accommodation and feeding apparatus which concerns on 1st Example. Sectional drawing which shows the structure of the sheet | seat accommodation and feeding apparatus which concerns on 1st Example. The top view which shows schematic structure of the sheet | seat accommodation apparatus which concerns on another Example. The top view which shows schematic structure of the sheet | seat accommodation apparatus which concerns on another Example. The top view which shows schematic structure of the sheet | seat accommodation apparatus which concerns on another Example. The top view which shows schematic structure of the sheet | seat accommodation apparatus which concerns on another Example. The perspective view which shows schematic structure of the sheet | seat accommodation apparatus which concerns on another Example. Sectional drawing which shows schematic structure of the conventional image recording apparatus Sectional drawing which shows schematic structure of the conventional sheet | seat accommodation / paper feeding apparatus Sectional drawing which shows schematic structure of the conventional sheet | seat accommodation / paper feeding apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet 1s Lower layer sheet layer 2 Sheet accommodating apparatus 2a Inclined surface 3 Pickup roller 11, 13 Resistance member 12 Separation pad 14 Convex member 16 Pressing member 19 Movable rack 20 Pinion 21 Fixed rack 40 Sheet feeding apparatus 50, 100 Image recording apparatus 111 Sheet material 112 Sheet storage means 120 Image recording unit

Claims (7)

  In a sheet storage device in which unused sheets are stacked and stored and a sheet feeding device using the same, a means that protrudes with respect to the storage device floor surface in a direction orthogonal to the sheet curl direction and along a substantially center line of the sheet, A sheet storage device comprising means for pressing both end portions of the rear end of the sheet layer from above the laminated sheet, and imparting deflection in the anti-curl direction to correct the sheet posture.   2. The sheet storage apparatus according to claim 1, wherein the means for projecting with respect to the floor surface of the storage apparatus is disposed so as to be rotatable in a direction orthogonal to the sheet curl direction.   The sheet storage device according to claim 1, wherein the means that protrudes with respect to the floor surface of the storage device is configured to be retractable with respect to the floor surface.   The sheet storage device according to claim 1, wherein the means that protrudes with respect to the floor surface of the storage device is always located at a sheet center in accordance with a sheet size.   The sheet storage device according to claim 2, wherein the means that protrudes with respect to the floor surface of the storage device is always located at the sheet center in accordance with a sheet size in conjunction with a partition plate for positioning the laminated sheet layer.   2. The sheet storage device according to claim 1, wherein the means for pressing both ends of the rear end of the sheet layer is covered with a member having a flexible member and having a desired friction.   The sheet storage device according to claim 1, wherein the separation unit is a bank separation system.