JP2006021865A - Paper feeding device, image forming device, and image reading device - Google Patents

Paper feeding device, image forming device, and image reading device Download PDF

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Publication number
JP2006021865A
JP2006021865A JP2004200181A JP2004200181A JP2006021865A JP 2006021865 A JP2006021865 A JP 2006021865A JP 2004200181 A JP2004200181 A JP 2004200181A JP 2004200181 A JP2004200181 A JP 2004200181A JP 2006021865 A JP2006021865 A JP 2006021865A
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Prior art keywords
recording
paper
feeding
paper feed
friction
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JP2004200181A
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Japanese (ja)
Inventor
Shigeo Minamino
茂夫 南野
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Kyocera Mita Corp
京セラミタ株式会社
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Priority to JP2004200181A priority Critical patent/JP2006021865A/en
Publication of JP2006021865A publication Critical patent/JP2006021865A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To feed recording material curled upward at a tip as curling is corrected. <P>SOLUTION: Between a friction member 41 of a presser plate 32 and a paper feed roller 31, a postcard (recording material) P is held, and the postcard P is fed by rotation of the paper feed roller 31. Height from a paper feed reference surface 44 to tops 42a and 42a of paper feed backing guides 42 and 42 is set to be almost similar to height of the friction member S (at the surface) from the paper feed reference surface 44 when recording material is fed. As the postcard P is held between the friction member 41 and the paper feed roller 31 when it is fed, curling in the postcard P, if any, is corrected. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sheet feeding device that feeds a sheet-shaped recording material, and an image forming apparatus and an image reading apparatus such as a copying machine, a FAX, and a printer using the sheet feeding device.
  Japanese Patent Application Laid-Open No. 2004-151858 discloses a paper feeding device that feeds a sheet-like recording material, and feeds a recording material sandwiched between a paper feeding roller and a friction member by rotation of the paper feeding roller. Yes.
  In this paper feeding device, an elastic sliding plate is disposed around the friction pad, and the recording material fed by the paper feeding roller is guided by the sliding plate and is fed between the paper feeding roller and the friction pad. It is conveyed toward the nip part. Further, the friction pad, the sliding plate, and the paper feed roller can be moved in the axial direction of the paper feed roller 10 in accordance with the size of the recording material in the paper passing width direction.
Japanese Utility Model Publication No. 7-13852
  However, according to the paper feeding device disclosed in Patent Document 1 described above, the recording material can be smoothly guided to the nip portion using the sliding plate, and the paper is fed in accordance with the size of the recording material in the paper passing width direction. Although the roller or the like can be moved as appropriate, the recording material with the curled tip is fed as it is, and there is a possibility that a jam (paper jam) may occur immediately after feeding. That is, for example, a postcard is used as a recording material, and the center along the paper passing width direction (the direction orthogonal to the paper feeding direction) at the front end of the postcard is curved upwardly to project both ends in the paper passing width direction. When the postcards are curled so as to hang downward, the postcard curled in this way is unlikely to be bent in a convex manner in the center along the paper feeding direction. For this reason, when this sheet feeding device is used in an image forming apparatus having a conveyance path that curves sharply immediately after feeding, the recording material curled as described above has a sharp curve in the conveyance path. Since it is difficult to follow the curve, the conveyance resistance increases, causing a paper jam.
  In the above description, the problem when the recording material is a postcard has been described. However, such a problem is not limited to a postcard but is a general problem when a thick recording material is conveyed. Also, providing a steep curve in the transport path to change the transport direction of the recording material is an effective means for reducing the size and space of the image forming apparatus.
  SUMMARY An advantage of some aspects of the invention is that it provides a sheet feeding device that can feed a recording material with a curled tip while correcting the curl. It is another object of the present invention to provide an image forming apparatus and an image reading apparatus in which jamming does not occur immediately after feeding by using this recording material.
  According to the first aspect of the present invention, the sheet-like recording material is sandwiched between the front side and the back side by a paper feeding roller and a pressing plate, and the paper feeding roller is rotated to feed the recording material by a frictional force. The pressing plate includes a base plate having a paper feed reference surface, a friction member attached to the paper feed reference surface and pressed against the back surface of the recording material, and a sheet passing width direction of the recording material. A sheet-feeding back surface guide that protrudes from the sheet-feeding reference surface on both outer sides of the friction member and lifts both ends of the recording material in the sheet-feeding width direction from the back side to a height corresponding to the surface of the friction member. It is a feature.
  According to a second aspect of the present invention, in the paper feeding device according to the first aspect, the height of the paper feed back surface guide from the paper feed reference surface is the reference when the friction member feeds the recording material. It is characterized by being set to approximately the same height from the surface.
  According to a third aspect of the present invention, in the paper feeding device according to the second aspect, the height of the paper feed back guide from the paper feed reference surface is the reference when the friction member feeds the recording material. It is characterized by being set equal to or higher than the height from the surface.
  According to a fourth aspect of the present invention, in the paper feeding device according to any one of the first to third aspects, the paper feeding back surface guide is formed in a streak shape along the paper feeding direction of the recording material. It is characterized by being.
  According to a fifth aspect of the present invention, in the paper feeding device according to the fourth aspect, the paper feed back surface guide is located on the upstream side in the paper feed direction, and the height from the paper feed reference surface is on the downstream side. It is characterized by having an inclined surface that gradually becomes higher.
  According to a sixth aspect of the present invention, in the paper feeding device according to any one of the first to fifth aspects, the paper feed back surface guide corresponds to each of a plurality of types of recording materials having different paper passing widths. It is characterized by being arranged in.
  The invention according to claim 7 is the sheet feeding device according to any one of claims 1 to 6, wherein the sheet feeding back surface guide is disposed at a position corresponding to at least a government postcard. It is said.
  According to an eighth aspect of the present invention, in the paper feeding device according to any one of the first to sixth aspects, the paper feeding back surface guide is movable and positioned in the paper passing width direction. .
  The invention according to claim 9 is the sheet feeding device according to any one of claims 1 to 8, wherein the pressing plate is moved in a direction in which the friction member approaches and moves away from the sheet feeding roller. A rocking mechanism for rocking is provided, and the rocking mechanism rocks the pressing plate in conjunction with the rotation of the paper feed roller.
  A tenth aspect of the present invention is an image forming apparatus, wherein the paper feeding apparatus according to any one of the first to ninth aspects and an image for forming an image on a recording material fed from the paper feeding apparatus. And a forming portion.
  Next, an invention according to an eleventh aspect is an image reading apparatus, and is recorded on the paper feeding device according to any one of the first to ninth aspects and a recording material fed from the paper feeding device. An image reading unit that reads an image is provided.
  According to the paper feeding device of the present invention, the recording material whose leading end is curled upward is the center of the paper passing direction (the portion sandwiched between both ends in the paper passing width direction) is in friction with the paper feeding roller. The both ends of the sheet passing width direction are lifted by the sheet feeding back surface guide from the back surface side. At this time, since both ends of the recording material in the sheet passing width direction are lifted to a height corresponding to the surface of the friction member, the height of the center portion in the sheet passing width direction and the both ends in the sheet passing direction are substantially the same. That is, the recording material is fed in a flat state with the convex curl corrected upward by the paper feed back surface guide.
  Next, according to the image forming apparatus according to the present invention, since the recording material with the curl corrected is supplied from the paper feeding device, it is possible to provide a sharply curved conveyance path immediately after paper feeding, for example. Compared with the case where a gently curved conveyance path is provided, the entire image forming apparatus can be reduced in size and space.
  Next, according to the image reading apparatus of the present invention, since the recording material with the curl corrected is supplied from the paper feeding device, it is possible to provide a sharply curved conveyance path immediately after paper feeding, for example. Compared with the case where a gently curved conveyance path is provided, the entire image reading apparatus can be reduced in size and space.
  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
(Outline of configuration and operation of image forming apparatus)
FIG. 1 is a schematic configuration diagram of an example of an image forming apparatus 1 using a sheet feeding device to which the present invention can be applied, as viewed from the front side (user side).
  As shown in FIG. 1, an image forming apparatus 1 according to the present embodiment includes an image forming apparatus main body 2 configured in a box shape, and a sheet feeding / conveying unit in the image forming apparatus main body 2 from the lower side in almost the order. 3, an image forming unit 4, a fixing unit 5, and a paper discharge unit 6 are provided.
  In the paper feeding / conveying unit 3, a manual paper feeding device 7, a paper feeding cassette 8 for automatic paper feeding, a paper feeding roller 10, a conveying roller 11, and a registration roller 12 are disposed. In the paper feeding / conveying unit 3, the recording material (sheet-like copy paper, plastic film, etc.) fed from the paper feeding device 7 or the recording material S fed from the paper feeding cassette 8 by the paper feeding roller 10. Is conveyed upward by the conveying roller 11, the skew is corrected by the registration roller 12, and image formation described below is performed at a predetermined timing (timing synchronized with a toner image formed on a photosensitive drum described later). Part 4 is supplied.
  The image forming unit 4 includes a photosensitive drum 13 that is rotationally driven in the direction of an arrow (clockwise in FIG. 1), a charging roller 14, an exposure device 15, and a developing device 16 that are arranged almost in sequence along the rotational direction. A transfer roller 17 and a cleaning device 18 are disposed. The image forming unit 4 forms a toner image on the recording material S supplied from the paper feeding / conveying unit 3 described above. That is, the photosensitive drum 13 uniformly charged by the charging roller 14 is exposed according to the image information by the exposure device 15 to form an electrostatic latent image. The electrostatic latent image is developed as a toner image with toner attached thereto by the developing device 16. The toner image formed on the photosensitive drum 13 is transferred by the transfer roller 17 to the recording material S supplied from the paper feeding / conveying unit 3 described above. The toner remaining on the photosensitive drum after the toner image transfer (transfer residual toner) is removed by the cleaning device 18. The recording material S having the toner image fixed on the surface thereof is conveyed to a fixing unit 5 described below.
  The fixing unit 5 includes a fixing roller 21 including a heater 20 and a pressure roller 22 pressed against the fixing roller 21. In the fixing unit 5, the recording material S conveyed from the image forming unit 4, that is, the recording material S carrying an unfixed toner image on the surface is nipped and conveyed by the nip portion between both rollers. At this time, the recording material S is heated and pressurized at the nip portion, and the toner image is fixed on the surface.
  The paper discharge unit 6 is provided with a paper discharge roller 23 and a paper discharge tray 24. The recording material S after the toner image is fixed is discharged onto a paper discharge tray 24 by a paper discharge roller 23.
  This completes the one-sided image formation for one recording material S by the image forming apparatus 1.
  In the present embodiment, the paper feeding device according to the present invention is applied to the manual paper feeding device 7 among the components of the image forming apparatus 1 shown in FIG. The image forming apparatus using the paper feeding device 7 has a conveyance path Ra that curves abruptly immediately after paper feeding (curves up so that the recording material protrudes downward) compared to a case where the paper feeding device 7 is not used. Since it can be formed, the length W in the left-right direction shown in FIG. 1 can be shortened, thereby shortening the length in the left-right direction of the image forming apparatus main body 2 and making the whole compact. The effect | action and effect that it is possible can be show | played. This action and effect will be described in detail after the next sheet feeding device 7 is described.
(Paper feeder)
FIG. 2 is a perspective view showing the overall configuration of the paper feeding device 7 to which the present invention can be applied. In the figure, the arrow F direction corresponds to the front side of the image forming apparatus 1 in FIG. 1, and the arrow R direction corresponds to the rear side. Further, a state in which a paper feed tray 33 (described later) is opened is shown.
  The paper feeding device 7 shown in FIG. 2 includes a paper feeding roller 31 and a pressing plate 32 that sandwich the recording material S (not shown in FIG. 2) from the front surface side and the back surface side as main components. In addition, a paper feed tray 33 that supports the recording material S during manual feeding from below is provided.
  The paper feed roller 31 is fixed substantially at the center of the paper feed roller shaft 34 disposed along the paper passing width direction. Here, the paper passing width direction refers to a direction orthogonal to the paper feeding direction (arrow K direction) of the recording material S fed by the paper feed roller 31, that is, the direction along the front end of the recording material S. The sheet passing width direction is the left-right direction toward the sheet feeding direction when the recording material S is fed, and the front-rear direction is based on the image forming apparatus 1 (see FIG. 1). It becomes. The feed roller shaft 34 with the feed roller 31 fixed at the center is rotatably supported at its rear end 34a by a bearing (not shown) disposed in the image forming apparatus main body 2. The front end portion 34b is connected to a drive gear (not shown) via a one-way clutch 35 and a torque limiter 36. A cam 37 is fixed slightly behind the one-way clutch 35 at the front end 34b. The cam 37 is for swinging a pressing plate 32 (described later) substantially vertically in synchronization with the rotation of the paper feed roller 31. When the recording material S is fed, the paper feed roller 31 rotates in the direction of the arrow R31 via a drive gear, a torque limiter 36, a one-way clutch 35, a paper feed roller shaft 34, and the like by rotation of a drive motor (not shown). It is designed to be rotated. The cam 37 described above is also rotated in the same direction as the paper feed roller 31 in synchronization with the rotation of the paper feed roller 31 in the direction of the arrow R31.
  The pressing plate 32 includes a base plate 40, a friction member 41, and paper feed back surface guides 42 and 42, and the whole is supported by a support member 43 so as to be able to swing substantially vertically. FIG. 3 shows a perspective view of the pressing plate 32 alone.
  The base plate 40 is formed in a plate shape that is long in the sheet passing width direction, and the upper surface side that contacts the back surface of the recording material S is a substantially flat sheet feeding reference surface 44. Of the four sides of the base plate 40, irregularities are formed on the downstream side (hereinafter simply referred to as “downstream side”) along the feeding direction of the recording material S. Further, a groove 45 is formed along the sheet passing width direction slightly downstream of the upstream side. Bent portions 46 and 47 bent upward are formed at the front end and the rear end of the base plate 40 (the front end portion 34b and the rear end portion 34a of the paper feed roller shaft 34). Among these, the upper surface of the bent portion 47 at the front end is a cam follower 48 that follows the cam 37 described above. In addition, through holes 50 and 51 are formed at upstream ends of the bent portions 46 and 47. Oscillating shafts 52 and 53 projecting inward from the support member 43 are inserted into the through holes 50 and 51. The base plate 40 is supported at its downstream portion so that it can swing substantially vertically by the swing shafts 52 and 53. Further, the base plate 40 is biased upward by a spring member (not shown) interposed between the back surface thereof and the support member 43 so that the above-described cam follower 48 always abuts against the cam 37. Yes. The cam 37, the cam follower 48, the through holes 50 and 51, the swinging shafts 52 and 53, and a spring member that biases the pressing plate 32 upward constitute a swinging mechanism that swings the pressing plate 32 substantially in the vertical direction. is doing. A friction member (friction pad) 41 is attached to substantially the center of the base plate 40 in the sheet passing width direction, that is, at a position corresponding to the above-described feed roller 31. The pressing plate 32 can be formed of sheet metal or synthetic resin.
  The friction member 41 is formed in a substantially rectangular shape, and is attached to the paper feed reference surface 44 of the base plate 40. Here, with respect to the friction coefficient between the members, the friction coefficient between the paper feed roller 31 and the recording material S is μa, the friction coefficient between the friction member 41 and the recording material S is μb, and the two recording materials are between. Assuming that the coefficient of friction is μc, μa> μb> μc is established between them. Between the groove 45 and the friction member 41 on the paper feed reference surface of the base plate 40, a conveyance guide 54 that is an inclined surface whose height increases as the distance from the friction member 41 increases is provided. When the recording material S is set on the paper feeding device 7 by the conveyance guide 54, the recording material S can be set between the friction member 41 and the paper feed roller 31 without the tip of the recording material S being caught by the friction member 41. it can. The friction member 41 is lightly brought into contact with and separated from the paper feed roller 31 by the spring member interposed between the back surface of the base plate 40 and the support member 43, the cam 37, and the like. Can be done.
  As shown in detail in FIGS. 3 and 4, the paper feed back surface guides 42, 42 protrude from the paper feed reference surface 44 on both outer sides of the friction member 41 along the paper passing width direction. The paper feed back surface guides 42 and 42 are formed in a streak shape along the paper feed direction, and the height from the paper feed reference surface 44 to the top portions 42a and 42a is the friction member S (surface of the recording material feed). ) Is set to be substantially the same as the height from the paper feed reference surface 44. Here, “the height of the friction member 41 when feeding the recording material from the paper feed reference surface 44” means that when the recording material S is fed, the friction member 41 passes the recording material S by the paper feed roller 31. In the pressed state, it refers to the height of the surface of the friction member 41 from the paper feed reference surface 44. More preferably, the height to the top portions 42a, 42a is set to be equal to or higher than the height of the friction member 41 from the reference surface 44 when the recording material is fed. By setting in this way, it becomes possible to exhibit the above-mentioned operation and effect of the present invention more remarkably. In the present embodiment, the positions of the paper feed rear surface guides 42, 42 in the sheet passing width direction are set so as to correspond to the positions slightly inside the both ends in the sheet passing width direction of postcards (government postcards). . As shown in FIG. 5 (enlarged longitudinal sectional view along the sheet feeding direction), the sheet feeding rear surface guides 42 and 42 are located on the upstream side in the sheet feeding direction and the height from the sheet feeding reference surface 44 on the downstream side. It has the inclined surfaces 42b and 42b which become gradually high toward it. The position of the inclined surface 42b in the sheet feeding direction is set to a position that overlaps the above-described conveyance guide 54. In the present embodiment, the paper feed rear surface guides 42 and 42 are formed integrally with the base plate 40.
  A paper feed tray 33 is disposed on the upstream side of the pressing plate 32 described above.
  As shown in FIGS. 1 and 2, the sheet feed tray 33 also serves as an opening / closing door, and is supported on the right side surface of the image forming apparatus main body 2 (see FIG. 1) so as to be freely opened and closed. The paper feed tray 33 has stacking portions 55 and 56 on which the recording material S is stacked. Among these, the downstream side loading section 56 is supported so that the downstream side thereof swings substantially in the vertical direction. The paper feed tray 33 is provided with restricting members 57 and 58 for restricting both side ends of the recording materials S stacked on the stacking portions 55 and 56. The restricting member 57 is disposed so as to be movable in the paper passing width direction, and is moved in conjunction with each other in the opposite direction by an interlocking mechanism (not shown, for example, a rack and a pinion). The upstream stacking unit 56 is provided with display units 60 and 61 that indicate the positions of both ends of the recording material S having different sizes in the sheet passing width direction.
  In the present embodiment, a separation member 62 is further disposed immediately downstream of the friction member 41. The separation member 62 includes a separation pad 63 disposed obliquely and a support member 64 that supports the separation pad 63.
  Next, the operation, action, and effect of the sheet feeder 7 having the above-described configuration will be described with reference to FIGS. In the following, an example is described in which one postcard (public postcard) is manually set in the paper feeding device 7 and fed by the paper feeding device 7.
  On the right side of the image forming apparatus main body 2, the user pulls out the paper feed tray 33 in the almost upright closed position (two-dot chain line in FIG. 1) to the manual feed position (solid line in FIGS. 1 and 2). The regulating members 57 and 58 on the stacking units 55 and 56 are set to the postcard positions of the display units 60 and 61, and the postcards are set on the stacking units 55 and 56. At this time, the pressing plate 32 is pushed down against the spring force of the spring member by the cam 37, and a gap is formed between the friction member 41 and the paper feed roller 31. The user sets the postcard so that the tip of the postcard passes through this gap and comes into contact with the friction pad 63. This completes preparation for manual sheet feeding.
  Subsequently, when the user presses a copy start button (not shown) on an operation panel (not shown) of the image forming apparatus main body 2, a manual sheet feeding operation is started.
  When the manual sheet feeding operation is started, the driving motor rotates, and the rotation of the driving motor causes the sheet feeding roller 31 to move in the direction of the arrow R31 via the driving gear, the torque limiter 36, the one-way clutch 35, the sheet feeding roller shaft 34, and the like. It is rotated. At this time, the cam 37 also rotates in the same direction, the pressing plate 32 rises, and the tip of the postcard is sandwiched between the friction member 41 and the paper feed roller 31.
  Here, as shown in FIG. 6A, consider a case where the front end of a postcard P as the recording material S is curled upwardly. As shown in FIG. 6A, in a state where the postcard P is set on the stacking portions 55 and 56, the paper feed roller 31 is separated from the friction member 41, so the curl of the postcard P remains as it is. That is, in this state, both end portions of the front end portion of the postcard P are placed on the paper feed back surface guides 42 and 42, and the central portion is in a state where the friction member 41 is lifted.
  However, when the copy button is pressed and the paper feeding operation is started, the pressing plate 32 is raised as described above, and the postcard P has a central portion at the tip as shown in FIG. It is sandwiched between the friction member 41 and the paper feed roller 31. In this state, the position of the front end portion of the postcard P, particularly the position of the back surface of the front end portion, is regulated by the center of the front surface of the friction member 41 and both ends thereof by the top portions 42a and 42a of the back surface paper feed guides 42 and 42. Be regulated. Incidentally, as described above, the height from the paper feed reference surface 44 to the top portions 42a and 42a is set to be substantially the same as the height of the friction member S (front surface) from the paper feed reference surface 44 when the recording material is fed. ing. Therefore, the postcard P in the sandwiched state is almost flat when the curl at the tip is corrected. In this state, the sheet feeding roller 31 is rotated to feed the sheet toward the downstream side by the frictional force with the sheet feeding roller 31, and further conveyed toward the downstream side while being rubbed against the separation pad 63.
  As described above, according to the paper feeding device 7 according to the present invention, the postcard P whose front end portion is curled in a convex shape is transported downstream by correcting the curl to be flat.
  In the above description, the case where the recording material S is a postcard P has been described as an example, but the present invention is not limited to this. That is, when a recording material S having a size different from that of the postcard P in the sheet passing width direction is used, if the paper feed back surface guides are arranged at positions corresponding to both ends of the recording material S to be used, It is possible to obtain almost the same effect as in the case of postcard P. In addition, when a plurality of types of recording materials S having different sizes in the sheet passing width direction are used, the feeding back surface guides may be arranged at positions corresponding to both ends of the recording materials S of the respective sizes. . In this case, the same effects as described above can be obtained for various recording materials S having different sizes.
  In the above-described embodiment, the case where the paper feed back surface guides 42 and 42 are integrally formed with the base plate 40 has been described as an example, but may be configured separately. In this case, for example, the base plate 40 is provided with mounting holes (not shown) for positioning and attaching the paper feed back surface guides 42, 42, and bosses (not shown) formed on the back surface of the paper feed back surface guide 42. It suffices to fit the mounting holes into the mounting holes. Further, when configured separately, the paper feed back surface guide 42 may be configured to be movable in the sheet passing width direction so as to correspond to recording materials S of various sizes. For example, a groove (not shown) in the sheet passing width direction may be provided in the base plate 40, and the sheet feeding back surface guides 42 and 42 may be slid along the groove. In the embodiment described above, the paper feed back surface guide 42 may be slid in conjunction with the regulating members 57 and 58.
  The image forming apparatus using the sheet feeding device 7 as described above can reduce the length W as shown in FIG. That is, when the above-described paper feeding device 7 is used, the recording material S can be fed downstream with the curling at the front end portion of the recording material S, particularly the upward convex curl that easily causes jamming, being corrected. it can. Therefore, the recording material S tends to bend following the curve of the transport path. For this reason, the radius of curvature of the transport path Ra immediately after paper feeding can be reduced, and the transport direction can be changed abruptly. Thereby, the length W can be shortened, and the length of the image forming apparatus main body 2 in the left-right direction can be shortened, and the entire image forming apparatus 1 can be made compact. In the above description, the electrophotographic image forming apparatus has been described as an example of the image forming apparatus using the paper feeding device 7. However, the image forming apparatus is not limited to this, and an electrostatic recording image forming apparatus or an inkjet is used. The present invention can also be applied to a type image forming apparatus. In this case, the configuration of the image forming unit is appropriate.
  The paper feeding device 7 having the above-described configuration can also be applied to an image reading device (not shown). That is, the present invention can also be applied to an image reading apparatus including a paper feeding device 7 and an image reading unit (not shown) that reads an image recorded on the recording material S sent out from the paper feeding device 7. In this case as well, substantially the same effect as in the case of the above-described image forming apparatus can be obtained.
  In addition, as long as the curl of the recording material S can be corrected, the top portion 42a of the back surface paper feed guide 42 has a height from the paper feed reference surface 44 and the friction member 41 is pressed by the paper feed roller 31 during paper feed. The height dimension can be determined in consideration of the dimension to be deformed.
1 is a schematic configuration diagram of an image forming apparatus using a sheet feeding device according to the present invention as viewed from the front side. It is a perspective view which shows the principal part of the paper feeder which concerns on this invention. It is a perspective view which shows the structure of a press plate single-piece | unit. It is the figure which looked at the press board from the downstream. It is a figure which shows the shape of the paper feed direction of a paper feed back surface guide. (A) is the schematic diagram which looked at the curled postcard before paper feeding from the downstream side. (B) is the schematic diagram which looked at the postcard in which the curl was corrected at the time of paper feeding from the downstream side.
Explanation of symbols
DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus, 2 ... Image forming apparatus main body, 3 ... Paper feed conveyance part, 4 ... Image forming part, 7 ... Paper feed apparatus, 31 ... Paper feed roller, 32 ... Pressure plate, 33... Feed tray, 40... Base plate, 40 b. Inclined surface, 41... Friction member, 42.

Claims (11)

  1. In a paper feeding device that sandwiches the front side and the back side of a sheet-like recording material by a paper feeding roller and a pressing plate, and rotates the paper feeding roller to feed the recording material by frictional force.
    The pressing plate includes a base plate having a paper feed reference surface, a friction member attached to the paper feed reference surface and pressed against the back surface of the recording material, and the friction member along the sheet passing width direction of the recording material. A paper feed back surface guide that protrudes from the paper feed reference surface on both sides and lifts both ends of the recording material in the paper passing width direction from the back side to a height corresponding to the surface of the friction member. apparatus.
  2. The height of the paper feed back surface guide from the paper feed reference surface is set to be substantially the same as the height of the friction member from the reference surface when the recording material is fed. The paper feeder described in 1.
  3. The height of the paper feed back surface guide from the paper feed reference surface is set to be equal to or higher than the height of the friction member from the reference surface when recording material is fed. The sheet feeding device according to claim 2.
  4. The sheet feeding device according to claim 1, wherein the sheet feeding back surface guide is formed in a streak shape along a sheet feeding direction of the recording material.
  5. 5. The sheet feeding back surface guide has an inclined surface whose height from the sheet feeding reference surface gradually increases toward a downstream side at a portion upstream of a sheet feeding direction. Paper feeder.
  6. 6. The sheet feeding device according to claim 1, wherein the sheet feeding back surface guide is disposed at a position corresponding to each of a plurality of types of recording materials having different sheet passing widths.
  7. The sheet feeding device according to claim 1, wherein the sheet feeding back surface guide is disposed at a position corresponding to at least a government-made postcard.
  8. The sheet feeding device according to any one of claims 1 to 6, wherein the sheet feeding back surface guide is movable and positioned in a sheet passing width direction.
  9. A swing mechanism that swings the pressing plate in a direction in which the friction member approaches and moves away from the paper feed roller;
    The paper feeding device according to claim 1, wherein the rocking mechanism rocks the pressing plate in conjunction with rotation of the paper feeding roller.
  10. An image forming apparatus comprising: the paper feeding device according to claim 1; and an image forming unit that forms an image on a recording material fed from the paper feeding device.
  11. An image reading device comprising: the sheet feeding device according to claim 1; and an image reading unit that reads an image recorded on a recording material fed from the sheet feeding device. apparatus.
JP2004200181A 2004-07-07 2004-07-07 Paper feeding device, image forming device, and image reading device Pending JP2006021865A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8616546B2 (en) 2009-11-09 2013-12-31 Ricoh Company, Ltd. Sheet feeder and image forming apparatus having stacker with elevation unit

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US8616546B2 (en) 2009-11-09 2013-12-31 Ricoh Company, Ltd. Sheet feeder and image forming apparatus having stacker with elevation unit

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