JP4381185B2 - Paper feeder - Google Patents

Description

  The present invention relates to a paper feeding device.

Conventionally, in an image forming apparatus such as a printer or a copying machine that forms an image on a recording medium by an image forming system such as an electrophotographic system, an electrostatic recording system, or a magnetic system, the recording medium is fed into the image forming apparatus. A paper feeding device is provided. The sheet feeding device includes a sheet feeding tray having a lifting plate, and the recording medium set in the sheet feeding tray is moved up and down by the lifting plate, and the recording medium is brought into contact with the sheet feeding roller, and the sheet feeding roller The recording medium is separated and fed one by one by the conveying force of the sheet and the friction of the medium separating rubber on the surface of the sheet feeding roller. Further, the image forming apparatus is provided with a manual insertion tray as a paper feed tray for feeding various recording media, for example, thick paper. The manual insertion tray is provided with a side guide that regulates the recording medium so that the recording medium does not shift in the width direction corresponding to each size of the recording medium (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 9-30658

  However, since the conventional manual insertion tray is not provided with a guide for restricting the recording medium in the paper feeding direction, a thin recording medium, a recording medium having a small size, or the like is fed. In this case, there is a problem that the recording medium set on the manual insertion tray is returned in the direction opposite to the paper feeding direction due to an impact caused by the raising / lowering operation of the lifting plate, and the paper is not normally fed.

  The present invention solves the problems of the conventional sheet feeding device and places the medium pressing means for pressing the uppermost surface of the medium placed on the placing means so as to be placed on the placing means. The placed medium can be pressed so as not to vary in the paper feeding direction, and the medium placed on the placing means does not vary in the paper feeding direction, thereby preventing poor paper feeding. An object is to provide a paper feeding device.

For this purpose, in the paper feeding device of the present invention, a placing means for placing the medium, a detecting means for detecting an end of the medium placed on the placing means, and the medium by the detecting means. After the end portion of the medium is detected, an elevating unit that elevates at least a part of the medium placed on the placing unit, and the medium raised by the elevating unit is supplied into the image forming apparatus. Supply means and medium pressing means for pressing the uppermost surface of the medium placed on the placing means, the medium pressing means at one end when viewed from a direction perpendicular to the medium supply direction. The pressing unit includes a pressing unit that presses the medium placed on the mounting unit and a weight unit, and a support unit that rotatably supports the medium pressing unit at the other end. The pressing unit includes the mounting unit described above. A curved portion bent in a direction away from Disposed in right and left two locations, the placed the medium on said placing means pressing the left and right two positions, wherein the weight section is disposed at the uppermost end of said medium pressing means is separated from the bent portion Ru is.

According to the present invention, the paper feeding device includes a placement unit that places a medium, a detection unit that detects an end of the medium placed on the placement unit, and a detection unit that detects the end of the medium. After the end portion is detected, the raising / lowering means for raising at least a part of the medium placed on the placing means, and the supply for feeding the medium raised by the raising / lowering means into the image forming apparatus Means and a medium pressing means for pressing the uppermost surface of the medium placed on the mounting means. The medium pressing means is at the front end when viewed from a direction perpendicular to the medium supply direction. and a pressing portion and the weight portion to press the medium placed on the said placing means includes a support portion for rotatably supporting the medium pressing means at the other end, said pressing portion from said placing means a bent portion bent in a direction away, right and left two places Is arranged, pressed the medium placed on said placing means in the left and right two positions, wherein the weight section is Ru is disposed on the top end of the medium pressing means is separated from the bent portion.

  In this case, the medium placed on the placing means can be pressed so as not to vary in the paper feeding direction, and the medium placed on the placing means does not vary in the paper feeding direction. Defects can be prevented.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a side sectional view showing a configuration of main components of a paper feeding device according to a first embodiment of the present invention, FIG. 2 is a perspective view of the paper feeding device according to the first embodiment of the present invention, and FIG. It is an enlarged view of the periphery of the medium detection sensor in the 1st Embodiment of this invention.

  As shown in the figure, the sheet feeding device 10 in the present embodiment has a manual insertion tray 11 as a mounting means attached to the main body of the image forming apparatus 20. Then, a recording medium 12 as a medium is placed on the manual insertion tray 11 and supplied into the image forming apparatus 20. A multipurpose feeder 21 attached to the main body of the image forming apparatus 20 is disposed above the manual insertion tray 11 as shown in FIG. The multi-purpose feeder 21 is used as an option to supply various recording media 12 into the image forming apparatus 20, and is detachably attached to the main body of the image forming apparatus 20 as an upper mounting means. . In this case, the manual insertion tray 11 serves as a lower placing means.

  Here, the image forming apparatus 20 is, for example, an electrophotographic printer, a facsimile machine, a copying machine, a printer, a facsimile machine, and a multifunction machine having the functions of a copying machine. May be. If the image forming apparatus 20 forms an image by electrophotography, an ID cartridge is arranged in the image forming apparatus 20 along the conveyance path of the recording medium 12 as an image forming unit (not shown). It is installed. The ID cartridge includes a photosensitive drum as an image carrier, a charging roller that is disposed around the photosensitive drum, supplies electricity to the surface of the photosensitive drum, and charges the photosensitive drum. An exposure device is provided that selectively irradiates the surface of the drum with light to form an electrostatic latent image. Further, a developing roller for conveying toner as a developer to the surface of the photosensitive drum on which the electrostatic latent image is formed, and a cleaning blade for removing the toner remaining on the surface of the photosensitive drum are provided. In addition, a transfer belt as a conveying unit that conveys the recording medium 12 and a transfer roller that is disposed to face the photosensitive drum and that transfers a toner image to the recording medium 12 conveyed by the transfer belt are also disposed. In the ID cartridge, a charging process for storing the charge of the photosensitive drum is performed by the charging roller, and an exposure process for irradiating light to a position where image data on the photosensitive drum is formed is performed by the exposure device. A developing process for attaching toner to the exposed portion is performed, and a transferring process for transferring the toner developed by the transfer roller to the recording medium 12 is performed. The fixing process for fixing the toner image on the recording medium 12 with heat and pressure is performed by a fixing device as a fixing unit. The image forming apparatus 20 may be an apparatus that forms a color image or an apparatus that forms a black and white image.

  The manual insertion tray 11 includes a mounting frame 13 for mounting the recording medium 12. The mounting frame 13 is formed by molding a resin and serves as an outer wall cover of the main body of the image forming apparatus 20. The mounting frame 13 is opened when the manual insertion tray 11 is used or when the optional multi-purpose feeder 21 is attached to the main body of the image forming apparatus 20. The mounting frame 13 includes a folding mechanism or an expansion / contraction mechanism so that a large-size recording medium 12 can be used in the manual insertion tray 11. Further, as shown in FIG. 2, the mounting frame 13 includes a side guide 33 that can move according to the size of the recording medium 12 to be mounted. Here, as shown in FIG. 1, the mounting frame 13 is disposed in an inclined state so that the recording medium 12 is easily fed to the image forming apparatus 20, but is disposed in a horizontal state. Also good.

  Further, above the mounting frame 13, a medium detection sensor 27 as a detecting means for detecting the end of the recording medium 12 mounted on the mounting frame 13 rotates about the rotation fulcrum 25. It is possible to arrange. The medium detection sensor 27 determines whether or not the recording medium 12 is placed on the placement frame 13 by blocking the infrared rays of the photosensor 34 as shown in FIG. Further, when the recording medium 12 is not placed, the sensor lever 26 is positioned in a vertical state by its own weight.

  Further, on the back side (right side in FIG. 1) of the mounting frame 13, an urging plate 14 is disposed, and a sheet separating mechanism as a feeding unit including a sheet feeding roller 15 and a separating frame 16 is disposed. ing. On the urging plate 14, an end on the back side of the recording medium 12 placed on the placement frame 13, that is, a tip end is placed. The urging plate 14 is pivotally attached to the urging plate fulcrum 17 and is urged upward by an urging member 32 made of a coil spring. The urging plate 14 is moved downward by the cam mechanism 31 against the urging force of the urging member 32. The urging plate 14, the urging member 32, and the cam mechanism 31 function as lifting means. The urging plate 14 is raised to a position indicated by a broken line in FIG. 1 every time one recording medium 12 is fed by the operation of the cam mechanism 31. As a result, the leading end of the recording medium 12 placed on the urging plate 14 is pressed by the paper feed roller 15, and the uppermost recording medium 12 moves between the paper feed roller 15 and the separation frame 16. Then, the ink is supplied to the conveyance path 18 in the image forming apparatus 20.

  Even if a plurality of recording media 12 are placed on the manual insertion tray 11 by the paper separation mechanism, the recording media 12 can be supplied into the image forming apparatus 20. However, the manual insertion tray 11 is a tray whose main purpose is to place recording media 12 such as envelopes and cardboard, so that a large amount of recording media 12 cannot be placed like a cassette tray. . The number of recording media 12 that can be placed on the manual insertion tray 11 is normally 10 to 50.

  A medium pressing member 24 as a medium pressing means is attached to the lower portion of the multi-purpose feeder 21. The medium pressing member 24 is formed by bending a stainless steel round bar, and includes a weight 23 made of tubular brass. The medium pressing member 24 is attached to the lower portion of the multi-purpose feeder 21 so as to be rotatable about the weight fulcrum 22. Thereby, the medium pressing member 24 can move in the moving direction of the weight indicated by the arrow in FIG. 1 together with the weight 23, and is placed on the placement frame 13 by the weight of the weight 23. The recording medium 12 is pressed from above. That is, the uppermost surface of the recording medium 12 is pressed by its own weight. As shown in FIG. 2, the medium pressing member 24 is configured to press the recording medium 12 at two left and right curved portions. Therefore, the medium pressing member 24 functions as a guide that prevents the recording medium 12 from being scattered in the transport direction.

  Next, the operation of the sheet feeding device 10 having the above configuration will be described.

  First, when the recording medium 12 is manually inserted and set on the tray 11, the side guide 33 is moved in accordance with the desired size of the recording medium 12. Then, one or a plurality of recording media 12 are placed on the placement frame 13. At this time, since the medium pressing member 24 is in contact with the upper surface of the mounting frame 13 at the point of the curved portion, when the recording medium 12 is manually inserted, the medium pressing member 24 is centered on the weight fulcrum 22. Rotate to move upward. Therefore, the recording medium 12 can be placed smoothly.

  When the recording medium 12 is placed on the placement frame 13, the leading end of the recording medium 12 hits the sensor lever 26 of the medium detection sensor 27, and the sensor lever 26 is centered on the rotation fulcrum 25. To rotate. Along with this, the upper portion of the rotation fulcrum 25 of the medium detection sensor 27 also rotates, so that the infrared blocking of the photo sensor 34 is released, and the recording medium 12 is mounted on the mounting frame 13. Detected. Further, the recording media 12 are aligned (aligned) by the front end of the recording medium 12 being abutted against the abutting surface of the separation frame 16. At this time, a load is applied so that the recording medium 12 is pressed against the mounting frame 13 by the medium pressing member 24 provided at the lower portion of the multipurpose feeder 21. When the placement of the recording medium 12 is detected by the medium detection sensor 27, the cam mechanism 31 is actuated to rotate the urging plate 14 about the urging plate fulcrum 17, and the leading end of the recording medium 12 is detected. Push up.

  At this time, the recording medium 12 receives a force in the direction opposite to the paper feeding direction because the medium detection sensor 27 attempts to return to the original position by gravity. As the urging plate 14 is raised, the recording medium 12 receives a force in the direction opposite to the paper feeding direction. These two forces are collectively referred to as force F1. At this time, a force F2 that opposes the force F1 is exerted on the recording medium 12 by the medium pressing member 24 in the paper feeding direction. When the leading end of the recording medium 12 comes into contact with the paper feed roller 15 by the upward movement of the urging plate 14, the paper feed roller 15 rotates in the direction of the arrow in FIG. . At this time, when there are a plurality of recording media 12, the uppermost recording medium 12 and the next recording medium 12 are separated by the frictional force between the separation frame 16 and the recording medium 12, and only the uppermost recording medium 12 is obtained. Are fed one by one. At this time, if the force in the direction opposite to the paper feeding direction acting on the recording medium 12 by the medium pressing member 24 is F3, the relations F2 ≧ F1 and F3 ≧ F4 are established.

  Further, in the present embodiment, even when the A6 size recording medium 12 which is the smallest recording medium 12 usable in the image forming apparatus 20 is placed on the placement frame 13, F2 ≧ F1, And the weight of the weight 23 is set to 3 [g] so that the relationship of F3 ≧ F4 is established. However, since the size of the usable recording medium 12 varies depending on the model of the image forming apparatus 20, the weight 23 is set so that the above-described force relationship is established with respect to the usable size of the recording medium 12. The weight of can be changed as appropriate.

  In the present embodiment, the medium pressing member 24 is attached to the lower portion of the multi-purpose feeder 21, but may be attached to the mounting frame 13 or the main body of the image forming apparatus 20. It may be attached.

  As described above, in the present embodiment, the medium pressing member 24 is provided so that the recording medium 12 placed on the placement frame 13 of the manual insertion tray 11 does not vary in the sheet feeding direction. I can hold it down. That is, the medium pressing member 24 raises the urging plate 14 and the medium detection sensor 27 causes the recording medium 12 to act against the force in the direction opposite to the paper feeding direction in the paper feeding direction. The recording medium 12 placed on the placement frame 13 does not vary in the paper feeding direction until the leading end of the paper comes into contact with the paper feed roller 15, and poor paper feeding can be prevented.

  Further, by attaching the medium pressing member 24 to the detachable multi-purpose feeder 21, even when a jam occurs in the manual insertion tray 11, the medium pressing member 21 can be removed by removing the multi-purpose feeder 21 from the main body of the image forming apparatus 20. 24 also comes off and the upper part of the manual insertion tray 11 is opened, so that maintenance is easy.

  Further, since the medium pressing member 24 presses the recording medium 12 with a point, the friction range acting between the medium 12 and the recording medium 12 can be extremely reduced, and the recording medium 12 can be easily placed. Can do. Further, since the medium pressing member 24 is rotatable about the weight fulcrum 22 by the weight of the weight 23, the medium pressing member 24 is mounted on the mounting frame 13 regardless of the number of recording media 12 to be mounted. A certain force is applied to the uppermost recording medium 12 and the recording medium 12 can be supplied stably.

  Next, a second embodiment of the present invention will be described. In addition, what has the same structure as 1st Embodiment attaches the same code | symbol, and abbreviate | omits the description. The description of the same operation and the same effect as those of the first embodiment is also omitted.

  FIG. 4 is a side sectional view showing the configuration of the main components of the paper feeding device in the second embodiment of the present invention, FIG. 5 is a perspective view of the paper feeding device in the second embodiment of the present invention, and FIG. It is an enlarged view of the medium detection sensor periphery in the 2nd Embodiment of this invention.

  In the present embodiment, as shown in FIG. 4, the position of the weight fulcrum 22 is arranged upstream of the weight 23 in the conveyance direction of the recording medium 12 (left side in FIG. 4).

  The manual insertion tray 11 includes a mounting frame 13 for mounting the recording medium 12. The mounting frame 13 is formed by molding a resin and serves as an outer wall cover of the main body of the image forming apparatus 20. The mounting frame 13 is opened when the manual insertion tray 11 is used or when the optional multi-purpose feeder 21 is attached to the main body of the image forming apparatus 20. The mounting frame 13 includes a folding mechanism or an expansion / contraction mechanism so that a large-size recording medium 12 can be used in the manual insertion tray 11. Further, as shown in FIG. 5, the mounting frame 13 includes a side guide 33 that can move according to the size of the recording medium 12 to be mounted. Here, as shown in FIG. 4, the mounting frame 13 is disposed in an inclined state so that the recording medium 12 is easily fed to the image forming apparatus 20, but is disposed in a horizontal state. Also good.

  Further, a medium detection sensor 27 that detects the recording medium 12 placed on the placement frame 13 is disposed above the placement frame 13 so as to be rotatable about a rotation fulcrum 25. The medium detection sensor 27 determines whether or not the recording medium 12 is placed on the placement frame 13 by blocking the infrared rays of the photosensor 34 as shown in FIG. Further, when the recording medium 12 is not placed, the sensor lever 26 is positioned in a vertical state by its own weight.

  Further, an urging plate 14 is disposed on the back side (right side in FIG. 4) of the mounting frame 13, and a sheet separating mechanism including a sheet feeding roller 15 and a separating frame 16 is disposed. On the urging plate 14, an end on the back side of the recording medium 12 placed on the placement frame 13, that is, a tip end is placed. The urging plate 14 is pivotally attached to the urging plate fulcrum 17 and is urged upward by an urging member 32 made of a coil spring. The urging plate 14 is moved downward by the cam mechanism 31 against the urging force of the urging member 32. The urging plate 14 moves up to a position indicated by a broken line in FIG. 4 every time one sheet of the recording medium 12 is fed by operating the cam mechanism 31. As a result, the leading end of the recording medium 12 placed on the urging plate 14 is pressed by the paper feed roller 15, and the uppermost recording medium 12 moves between the paper feed roller 15 and the separation frame 16. Then, the ink is supplied to the conveyance path 18 in the image forming apparatus 20.

  Even if a plurality of recording media 12 are placed on the manual insertion tray 11 by the paper separation mechanism, the recording media 12 can be supplied into the image forming apparatus 20. However, the manual insertion tray 11 is a tray whose main purpose is to place recording media 12 such as envelopes and cardboard, so that a large amount of recording media 12 cannot be placed like a cassette tray. . The number of recording media 12 that can be placed on the manual insertion tray 11 is normally 10 to 50.

  A medium pressing member 24 is attached to the lower portion of the multipurpose feeder 21. The medium pressing member 24 is formed by bending a stainless steel round bar, and includes a weight 23 made of tubular brass. The medium pressing member 24 is attached to the lower portion of the multi-purpose feeder 21 so as to be rotatable about the weight fulcrum 22. Thereby, the medium pressing member 24 can move in the moving direction of the weight indicated by the arrow in FIG. 4 together with the weight 23, and is placed on the placement frame 13 by the weight of the weight 23. The recording medium 12 is pressed from above. As shown in FIG. 5, the medium pressing member 24 presses the recording medium 12 at two curved portions on the left and right. Therefore, the medium pressing member 24 functions as a guide that prevents the recording medium 12 from being scattered in the transport direction.

  Next, the operation of the sheet feeding device 10 in the present embodiment will be described.

  First, when the recording medium 12 is manually inserted and set on the tray 11, the side guide 33 is moved in accordance with the desired size of the recording medium 12. Then, one or a plurality of recording media 12 are placed on the placement frame 13. At this time, since the medium pressing member 24 is in contact with the upper surface of the mounting frame 13 at the point of the curved portion, when the recording medium 12 is manually inserted, the medium pressing member 24 is centered on the weight fulcrum 22. Rotate to move upward. Therefore, the recording medium 12 can be placed smoothly. In the present embodiment, the medium pressing member 24 is arranged such that the positions of the weight 23 and the weight fulcrum 22 of the medium pressing member 24 are opposite to the positions in the first embodiment. This frame is sufficiently long upstream in the paper feeding direction, and can be set very smoothly without being caught by the medium pressing member 24 when the recording medium 12 is placed.

  When the recording medium 12 is placed on the placement frame 13, the leading end of the recording medium 12 abuts on the sensor lever 26 of the medium detection sensor 27, and the sensor lever 26 is centered on the rotation fulcrum 25. Rotate. Along with this, the upper portion of the rotation fulcrum 25 of the medium detection sensor 27 also rotates, so that the infrared blocking of the photo sensor 34 is released, and the recording medium 12 is mounted on the mounting frame 13. Detected. Further, the recording media 12 are aligned by abutting the front end portion against the abutting surface of the separation frame 16. At this time, a load is applied so that the recording medium 12 is pressed against the mounting frame 13 by the medium pressing member 24 provided at the lower portion of the multipurpose feeder 21. When the placement of the recording medium 12 is detected by the medium detection sensor 27, the cam mechanism 31 is actuated to rotate the urging plate 14 about the urging plate fulcrum 17, and the leading end of the recording medium 12 is detected. Push up.

  At this time, the recording medium 12 receives a force in the direction opposite to the paper feeding direction because the medium detection sensor 27 attempts to return to the original position by gravity. As the urging plate 14 is raised, the recording medium 12 receives a force in the direction opposite to the paper feeding direction. These two forces are collectively referred to as force F1. At this time, a force F2 that opposes the force F1 is exerted on the recording medium 12 by the medium pressing member 24 in the paper feeding direction. When the leading end of the recording medium 12 comes into contact with the paper feed roller 15 by the upward movement of the urging plate 14, the paper feed roller 15 rotates in the direction of the arrow in FIG. 4 to start feeding the recording medium 12. . At this time, when there are a plurality of recording media 12, the uppermost recording medium 12 and the next recording medium 12 are separated by the frictional force between the separation frame 16 and the recording medium 12, and only the uppermost recording medium 12 is obtained. Are fed one by one. At this time, if the force in the direction opposite to the paper feeding direction acting on the recording medium 12 by the medium pressing member 24 is F3, the relations F2 ≧ F1 and F3 ≧ F4 are established.

  Further, in the present embodiment, even when the A6 size recording medium 12 which is the smallest recording medium 12 usable in the image forming apparatus 20 is placed on the placement frame 13, F2 ≧ F1, And the weight of the weight 23 is set to 3 [g] so that the relationship of F3 ≧ F4 is established. However, since the size of the usable recording medium 12 varies depending on the model of the image forming apparatus 20, the weight 23 is set so that the above-described force relationship is established with respect to the usable size of the recording medium 12. The weight of can be changed as appropriate.

  In the present embodiment, the medium pressing member 24 is attached to the lower portion of the multi-purpose feeder 21, but may be attached to the mounting frame 13 or the main body of the image forming apparatus 20. It may be attached.

  Thus, in the present embodiment, the effects of the first embodiment are exhibited by disposing the medium pressing member 24. Further, since the positions of the weight 23 and the weight fulcrum 22 of the medium pressing member 24 are arranged at positions opposite to the positions in the first embodiment, the frame of the medium pressing member 24 feeds the paper. It is sufficiently long upstream in the direction, and can be set very smoothly without being caught by the medium pressing member 24 when the recording medium 12 is placed.

  In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.

FIG. 3 is a side cross-sectional view illustrating a configuration of main components of the sheet feeding device according to the first embodiment of the present invention. 1 is a perspective view of a sheet feeding device according to a first embodiment of the present invention. It is an enlarged view of the periphery of the medium detection sensor in the 1st Embodiment of this invention. It is a sectional side view which shows the structure of the main components of the paper feeder in the 2nd Embodiment of this invention. It is a perspective view of the paper feeder in the 2nd Embodiment of this invention. It is an enlarged view of the medium detection sensor periphery in the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Paper feeder 11 Manual insertion tray 12 Recording medium 14 Energizing plate 20 Image forming apparatus 21 Multipurpose feeder 24 Medium pressing member 27 Medium detection sensor 31 Cam mechanism 32 Energizing member

Claims (12)

(A) mounting means for mounting the medium;
(B) detection means for detecting an end of the medium placed on the placement means;
(C) after the end of the medium is detected by the detecting means, lifting means for raising at least a part of the medium placed on the placing means;
(D) supply means for supplying the medium raised by the elevating means into the image forming apparatus;
(E) medium pressing means for pressing the uppermost surface of the medium placed on the placing means,
(F) The medium pressing means includes a pressing part and a weight part for pressing the medium placed on the mounting means at one end when viewed from a direction perpendicular to the supply direction of the medium, and the other end. A support portion for rotatably supporting the medium pressing means,
(G) the pressing unit, before a bent portion bent in a direction away from said placing means is disposed in the right and left two locations, said placing means placed on the said medium left two positions on Press down with
(H) the weight section includes a sheet feeding apparatus according to claim Rukoto disposed on the top end of the medium pressing means is separated from the bent portion. The sheet feeding device according to claim 1, wherein the medium pressing unit presses an uppermost surface of the medium by its own weight. The sheet feeding device according to claim 1, wherein a plurality of the placing units are provided on the top and bottom. The sheet feeding device according to claim 1, wherein two placing units are provided on the top and bottom, and an upper placing unit is detachable from the image forming apparatus. The sheet feeding device according to claim 4, wherein the medium pressing unit of the lower mounting unit is provided in the upper mounting unit. The sheet feeding device according to claim 1, wherein the medium pressing unit is formed by bending a round bar. The sheet feeding device according to claim 1 , wherein the pressing unit is disposed upstream of the support unit with respect to a supply direction of the medium. The sheet feeding device according to claim 1 , wherein the pressing unit is disposed downstream of the support unit with respect to a supply direction of the medium. The sheet feeding device according to claim 7 or 8 , wherein the pressing portion is a curved portion of a bar member. Sheet feeding apparatus according to any one of claims 1 to 9, wherein the medium pressing means comprising a weight portion disposed in the vicinity of the pressing portion. The sheet feeding device according to claim 10 , wherein the weight portion is disposed between pressing portions disposed at two right and left positions. The paper feeding device according to claim 10 or 11 , wherein the weight portion is changed according to a size of the medium.

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