JP4872772B2 - Paper feeder - Google Patents

Paper feeder Download PDF

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Publication number
JP4872772B2
JP4872772B2 JP2007104930A JP2007104930A JP4872772B2 JP 4872772 B2 JP4872772 B2 JP 4872772B2 JP 2007104930 A JP2007104930 A JP 2007104930A JP 2007104930 A JP2007104930 A JP 2007104930A JP 4872772 B2 JP4872772 B2 JP 4872772B2
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Japan
Prior art keywords
sheet
contact
sheet feeding
support
arc
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Expired - Fee Related
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JP2007104930A
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Japanese (ja)
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JP2008260616A (en
Inventor
康夫 中村
耕平 梶
美智也 武田
淳彦 霜山
Original Assignee
コニカミノルタビジネステクノロジーズ株式会社
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Description

  The present invention relates to an image forming apparatus such as a copying machine, a printer, a facsimile, or the like, in which a rotating sheet feeding roller is brought into pressure contact with a sheet material stacked on a loading table, and the sheet material is fed from the loading table by the sheet feeding roller. The present invention relates to a paper device, and is particularly characterized in that a sheet material is reliably fed by a paper feed roller while suppressing a paper feed error.
  Conventionally, in an image forming apparatus such as a copying machine, a printer, and a facsimile, sheet materials are sequentially sent out from a stacking table by a sheet feeding device.
  Conventionally, as such a sheet feeding device, generally, a loading table on which sheet materials are stacked is pushed up at an appropriate timing by a biasing member such as a spring, and the sheet material loaded on the loading table is made of resin or the like. In this state, the sheet feeding roller is pressed against the configured sheet feeding roller, and the sheet feeding roller is rotated in this state to feed the pressed sheet material.
  However, when the sheet material loaded in this way is pushed up at an appropriate timing by an urging member such as a spring and the sheet material loaded on the load table is pressed against the paper feed roller, the number of parts is reduced. There is a problem that the space is required as the number increases, the cost is high, the apparatus cannot be downsized, and the sound during operation increases.
  Further, in the above case, the pressure contact force between the sheet feeding roller and the sheet material is substantially constant. When this pressure contact force is high, two or more sheet materials are easily fed together, If the pressure contact force is weak, there is also a problem that the sheet material is not properly fed.
  Conventionally, as shown in Patent Document 1, a paper feed roller in which a fluid is sealed in an elastic hollow roller is used, and at the end of the sheet material on the stacking table on which the sheet material is stacked. A paper feeding device provided with a separating member has been proposed.
However, in the case of the paper feed roller in which the fluid is sealed in the elastic hollow roller as described above, the manufacture thereof is difficult, and there is a possibility that the fluid leaks and an appropriate pressure contact force cannot be obtained. Even when such a paper feed roller is used, the pressure contact force between the paper feed roller and the sheet material becomes substantially constant, and when the pressure contact force is high as described above, two or more sheet materials are used. However, if the pressure contact force is weak, the sheet material cannot be fed properly.
JP 2000-44070 A
  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems in a sheet feeding apparatus in which a rotating sheet feeding roller is brought into pressure contact with a sheet material stacked on a loading table and the sheet material is fed from the loading table by the sheet feeding roller. By appropriately controlling the pressure contact force between the paper feed roller and the sheet material, two or more sheet materials can be fed together as described above, or the sheet material can be fed properly. It is an object of the present invention to suppress sheet feeding errors such as not being fed and to appropriately feed a sheet material by a sheet feeding roller.
  In the present invention, in order to solve the above-described problems, in a sheet feeding apparatus in which a rotating sheet feeding roller is brought into pressure contact with a sheet material stacked on a loading table, and the sheet material is fed from the loading table by the sheet feeding roller. The paper feed roller is constituted by a hollow elastic body having an arc-shaped contact portion that contacts the sheet material and a pair of support members that support both ends of the arc-shaped contact portion. The elastic strength of the paper roller with respect to the sheet material is set to be lower than the central portion of the arc-shaped contact portion in the support member on the contact start side where the paper roller starts to contact the sheet material.
  In the paper feeding device of the present invention, it is desirable that a support member for supporting the arc-shaped contact portion is further provided between the pair of support members in the paper feed roller.
  In the sheet feeding device, the elastic strength of the support member on the contact start side that starts to contact the sheet material is lower than the elastic strength of the sheet material at the center of the arcuate contact portion. In this case, the thickness of the support member on the contact start side where the paper feed roller begins to contact the sheet material is made thinner than the thickness of the center portion of the arc-shaped contact portion, or the sheet material in the arc-shaped contact portion described above The thickness of the end portion on the contact start side where the contact starts is made thinner than the thickness of the center portion, or the arc-shaped contact portion and the support member of the paper feeding roller are made of different elastic materials, and the sheet The elastic strength of the support member on the contact start side that starts to contact the material can be reduced.
  Further, in the sheet feeding device of the present invention, in order to improve sheet feeding performance of the sheet material in the sheet feeding roller, the outer peripheral portion of the arc-shaped contact portion is made of a material having a high friction coefficient. Is preferred.
  Further, in the sheet feeding device of the present invention, a guide portion inclined upward is provided at an end portion on the sheet material sending side in the stacking table on which the sheet material is stacked. It is preferable that the arc-shaped contact portion of the paper feed roller is pressed.
  In the sheet feeding device according to the present invention, when a sheet feeding roller rotating is brought into pressure contact with the sheet material stacked on the loading table and the sheet material is fed from the loading table by the sheet feeding roller, the sheet material is used as a sheet feeding roller. A hollow elastic body having an arc-shaped contact portion that contacts and a pair of support members that support both ends of the arc-shaped contact portion is used. In the support member on the contact start side that starts to come into contact with the sheet material, the contact pressure is lower than the central portion of the arc-shaped contact portion. The contact pressure increases.
  For this reason, the initial contact pressure at which the sheet feed roller contacts the sheet material increases, and two or more sheet materials are fed together, or the contact pressure of the sheet feed roller to the sheet material becomes weak overall. Thus, the sheet material is prevented from being properly fed, and the sheet material is properly fed by the sheet feeding roller.
  In the sheet feeding device of the present invention, when a support member that supports the arc-shaped contact portion is further provided between the pair of support members in the sheet feed roller, the sheet feed roller is separated from the pair of support members. A decrease in contact pressure with respect to the sheet material at the center of the arc-shaped contact portion is suppressed, and a sufficient contact pressure with respect to the sheet material can be obtained in the entire arc-shaped contact portion. The material can be fed more appropriately.
  Further, in the sheet feeding device according to the present invention, it is not necessary to push up the stacking table on which the sheet material is stacked by a biasing member such as a spring and press the sheet material against the sheet feeding roller as in the conventional case. And the size of the apparatus can be reduced, and the sound during operation is not increased.
  Further, in the sheet feeding device according to the present invention, when a guide portion inclined upward is provided at an end portion on the sheet material sending side in the stacking table on which the sheet material is stacked, two or more sheet materials are joined together by the guide portion. In this guide portion, if the sheet material is pressed against the arc-shaped contact portion of the paper feed roller, the sheet material is brought into the guide portion. This sheet feeding roller ensures that only one sheet material is reliably guided to the guide portion and fed without being restrained and not being properly fed.
  Next, a paper feeding device according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. The sheet feeding device according to the present invention is not particularly limited to the one shown in the following embodiment, and can be implemented with appropriate modifications within a range not changing the gist thereof.
  In the sheet feeding device in this embodiment, as shown in FIG. 1, a rotating sheet feeding roller 20 is brought into pressure contact with the sheet material S stacked on the stacking table 10, and the sheet material S is loaded by the sheet feeding roller 20. The sheet material S is guided between the pair of feed rollers 12 from the guide portion 11 to the guide portion 11 inclined upward at the end portion on the feeding side. In addition, the guide portion 11 is provided with a winding member 13 for spreading the sheet material S guided as described above one by one to prevent the sheet material S from being repeatedly fed.
  In the sheet feeding device of this embodiment, the above-described sheet feeding roller 20 uses a rotating shaft 21 to which a hollow elastic body made of an elastic material such as EPDM is attached. In the elastic body, a pair of support members 24 a and 24 b extending from attachment portions 23 attached to the rotary shaft 21 at both ends of the arc-shaped contact portion 22 that contacts the sheet material S loaded on the loading table 10. Further, two support members 24c and 24d are provided between the pair of support members 24a and 24b so that the arc-shaped contact portion 22 is supported by the four support members 24a to 24d. I have to.
  Further, in this embodiment, the thickness of each of the support members 24a to 24d is made thinner than the thickness of the central portion of the contact portion 22, and the contact portion 22 joined to the support members 24a and 24b on both sides. The thickness of both end portions of the sheet is smaller than the thickness of the central portion, and the elastic strength of the support member 24a on the contact start side where the sheet feeding roller 20 starts rotating and comes into contact with the sheet material S is circular. It is made to become lower than the elastic strength with respect to the sheet | seat material S in the center part of the arc-shaped contact part 22. FIG.
  Here, in the sheet feeding device in this embodiment, the state in which the sheet material S stacked on the stacking table 10 is fed by rotating the sheet feeding roller 20 is based on FIGS. 2 (A) to 2 (D). Will be described in detail.
  First, when the paper feed roller 20 rotates, the support member 24a on the contact start side of the paper feed roller 20 comes into contact with the sheet material S as shown in FIG.
  When the paper feed roller 20 further rotates, as shown in FIG. 2B, the arcuate shape between the support member 24a on the contact start side of the paper feed roller 20 and the next support member 24c. The contact portion 22 comes into contact with the sheet material S. At this time, since the elastic strength of the support member 24a on the contact start side is low as described above, the support member 24a is greatly deformed and the contact pressure applied to the sheet material S is weakened. In this state, the sheet material S is fed. After that, the contact pressure applied to the sheet material S gradually increases, and only the uppermost sheet material S stacked on the stacking table 10 is conveyed along with the rotation of the paper feed roller 20, and this sheet material The leading end portion of S is guided to the guide portion 11 at the end portion on the delivery side of the loading table 10.
  Further, when the paper feeding roller 20 is rotated, as shown in FIG. 2C, the leading end side of the sheet material S is in the state of being pressed against the contact portion 22 on the support member 24a side on the contact start side. The three support members 24c, 24d. The contact portion 22 between 24b is also brought into pressure contact with the sheet material S described above. In this case, these support members 24c, 24d. 24b, the supporting members 24c, 24d. 24b, the contact pressure of the contact portion 22 between the support members 24c, 24d. By appropriately deforming the 24b, it is possible to prevent an excessive contact pressure from being applied to the sheet material S and to suppress the repeated feeding of the sheet material S.
  When the paper feed roller 20 further rotates, as shown in FIG. 2D, the two support members 24d. The sheet material S is conveyed along the guide portion 11 while being pressed against the contact portion 22 between 24b, and the leading end portion of the sheet material S is guided between the feed rollers 12. .
  Next, when the sheet material S is fed by rotating the sheet feeding roller 20 as described above, the state in which the contact pressure acting on the sheet material S changes is shown in FIGS. 3 (A) to 3 (F) and FIG. Based on
  Here, in FIG. 3A, the state before the rotation when the paper feed roller 20 is not in contact with the sheet material S is shown, and in FIG. 3B, the paper feed roller 20 is rotated by 45 °, In the state where the support member 24a is in contact with the sheet material S, the contact portion 22 between the support member 24a on the contact start side and the next support member 24c is rotated in FIG. 3D, the sheet feeding roller 20 rotates 135 ° in FIG. 3D, and the contact portion 22 between the two support members 24c and 24d located in the middle is brought into contact with the sheet material S. In FIG. 3E, the contact portion 22 between the rear-side support member 24d and the contact-end-side support member 24b located in the middle is turned into a sheet. In FIG. 3F, the state where the sheet S is pressed against the material S is 2 A state before the support member 24b on the contact end side is separated from the sheet material S by rotating 25 ° is shown.
  FIG. 4 shows a state in which the contact pressure acting on the sheet material S changes when the sheet feeding roller 20 is rotated in this way.
  Here, in the paper feed roller 20, the pressure contact force by the support member 24a on the contact start side has a mountain shape in the range of 45 ° to 135 °, and the pressure contact force by the two support members 24c and 24d located in the middle. Becomes a mountain shape in the range of 90 ° to 180 °, and the pressure contact force by the support member 24b on the contact end side becomes a mountain shape in the range of 135 ° to 225 °.
  In the range in which the paper feed roller 20 rotates by 45 ° to 90 °, only the pressure contact force by the contact start side support member 24a acts, and the contact pressure of the contact portion 22 acting on the sheet material S. Will gradually increase.
  Next, in the range in which the paper feed roller 20 rotates by 90 ° to 135 °, the pressure contact force by the support member 24a on the contact start side and the pressure contact force by the two support members 24c and 24d located in the middle are combined. Thus, the contact pressure of the contact portion 22 acting on the sheet material S is indicated by a broken line in FIG.
  Next, in the range in which the paper feed roller 20 rotates from 135 ° to 180 °, the pressure contact force by the two support members 24c and 24d located in the middle and the pressure contact force by the support member 24b on the contact end side are combined. Thus, the contact pressure of the contact portion 22 acting on the sheet material S is indicated by a broken line in FIG.
  Next, in the range in which the paper feed roller 20 rotates by 180 ° to 225 °, only the pressure contact force by the support member 24b on the contact end side acts, and the contact pressure of the contact portion 22 acting on the sheet material S gradually decreases. To come.
  As a result, when the sheet material S is fed by rotating the sheet feeding roller 20, the initial contact pressure at which the sheet feeding roller 20 contacts the sheet material S is weak, and then the contact pressure increases. As a result, the initial contact pressure at which the sheet feeding roller 20 contacts the sheet material S is increased, and two or more sheet materials S are not fed together. The contact pressure of the sheet feeding roller with respect to the sheet material S is weakened as a whole, and the sheet material S is also prevented from being fed properly. The sheet feeding roller 20 feeds the sheet material S appropriately one by one. Will come to be.
  In this embodiment, the position of the paper feed roller 20 can be changed, and the contact pressure can be changed by adjusting the distance between the paper feed roller 20 and the sheet material S. The thickness of the support member 24a on the contact start side of the paper feed roller 20 is changed to change the contact pressure at the start of paper feed of the sheet material S, or the two support members 24c located in the middle of the above. , 24d can be changed, or the number of supporting members provided in the middle can be changed to change the contact pressure applied to the sheet material S during feeding.
  In this embodiment, the hollow elastic body of the paper feed roller 20 is made of one type of elastic material. However, the arc-shaped contact portion 22 and the support members 24a to 24d The contact pressure applied to the sheet material S can be changed by using different elastic materials, and in particular, the elastic material having a small elastic strength is used for the support member 24a on the contact start side to contact the sheet material S. The initial contact pressure can be reduced.
  Further, in order to improve the sheet feeding performance of the sheet material S in the sheet feeding roller 20, the outer peripheral portion 22a of the arc-shaped contact portion 22 may be made of a material having a high coefficient of friction as shown in FIG. Is possible.
1 is a schematic side view illustrating a sheet feeding device according to an embodiment of the present invention. FIG. 5 is a partial explanatory view showing a process of feeding a sheet material by rotating a paper feed roller in the paper feeding device according to the embodiment. FIG. 6 is a partial explanatory view showing a deformed state of the paper feed roller when the paper feed roller rotates to feed a sheet material in the paper feed device according to the embodiment. FIG. 6 is a diagram illustrating a state in which contact pressure acting on a sheet material changes in the above-described process of feeding a sheet material by rotating a sheet feed roller in the sheet feeding device according to the embodiment. It is the schematic side view which showed the example of a change of the paper feeding roller used for the paper feeding apparatus which concerns on said embodiment.
Explanation of symbols
DESCRIPTION OF SYMBOLS 10 Loading stand 11 Guide part 12 Feeding roller 13 Rolling member 20 Paper feed roller 21 Rotating shaft 22 Contact part 22a Outer peripheral part 23 Mounting part 24a-24d Support member S Sheet material

Claims (7)

  1.   In a sheet feeding device in which a rotating sheet feeding roller is brought into pressure contact with a sheet material stacked on a loading table, and the sheet material is fed from the loading table by the sheet feeding roller, the sheet feeding roller is in an arc shape in contact with the sheet material And a pair of support members that support both ends of the arc-shaped contact portion, and the elastic strength of the sheet feeding roller with respect to the sheet material is in contact with the sheet material. A sheet feeding device characterized in that a support member on a starting contact start side is lower than a center portion of an arc-shaped contact portion.
  2.   2. The sheet feeding device according to claim 1, wherein a support member for supporting the arc-shaped contact portion is further provided between the pair of support members of the sheet feeding roller. apparatus.
  3.   3. The sheet feeding device according to claim 1, wherein a thickness of the support member on a contact start side at which the sheet feeding roller starts to contact the sheet material is smaller than a thickness at a central portion of the arc-shaped contact portion. A paper feeding device characterized by that.
  4.   4. The sheet feeding device according to claim 1, wherein a thickness of an end portion on a contact start side starting to contact with the sheet material in the arc-shaped contact portion is larger than a thickness of a central portion thereof. A paper feeding device characterized in that it is also thinner.
  5.   5. The sheet feeding device according to claim 1, wherein the arc-shaped contact portion and the support member of the sheet feeding roller are made of different elastic materials. Paper device.
  6.   6. The sheet feeding device according to claim 1, wherein an outer peripheral portion of the arc-shaped contact portion of the sheet feeding roller is made of a material having a high coefficient of friction. A paper feeder.
  7.   The sheet feeding device according to any one of claims 1 to 6, wherein an upwardly inclined guide portion is provided at an end portion on a sheet material feeding side in a stacking table on which the sheet material is stacked, An arcuate contact portion of the sheet feed roller is pressed against the sheet material also in the guide portion.
JP2007104930A 2007-04-12 2007-04-12 Paper feeder Expired - Fee Related JP4872772B2 (en)

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Application Number Priority Date Filing Date Title
JP2007104930A JP4872772B2 (en) 2007-04-12 2007-04-12 Paper feeder

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Application Number Priority Date Filing Date Title
JP2007104930A JP4872772B2 (en) 2007-04-12 2007-04-12 Paper feeder

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JP2008260616A JP2008260616A (en) 2008-10-30
JP4872772B2 true JP4872772B2 (en) 2012-02-08

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Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01209265A (en) * 1988-02-12 1989-08-23 Canon Inc Feed roller
JPH0573557B2 (en) * 1989-12-25 1993-10-14 Sumitomo Rubber Ind
JPH04169425A (en) * 1990-10-30 1992-06-17 Brother Ind Ltd Paper feeding roller
US5326184A (en) * 1992-10-26 1994-07-05 Hewlett-Packard Company Apparatus and method for picking paper from a stack
JP2001088947A (en) * 1999-09-27 2001-04-03 Nec Shizuoka Ltd Recording paper cassette
JP2005015091A (en) * 2003-06-24 2005-01-20 Canon Finetech Inc Sheet material feeder and recording device
JP4218509B2 (en) * 2003-11-26 2009-02-04 富士ゼロックス株式会社 Sheet material feeding device

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