JPH04365733A - Paper feeder - Google Patents
Paper feederInfo
- Publication number
- JPH04365733A JPH04365733A JP3166124A JP16612491A JPH04365733A JP H04365733 A JPH04365733 A JP H04365733A JP 3166124 A JP3166124 A JP 3166124A JP 16612491 A JP16612491 A JP 16612491A JP H04365733 A JPH04365733 A JP H04365733A
- Authority
- JP
- Japan
- Prior art keywords
- paper
- roller
- paper feed
- paper feeding
- reversing roller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010586 diagram Methods 0.000 description 4
- 230000035553 feeding performance Effects 0.000 description 4
- 108091008695 photoreceptors Proteins 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Landscapes
- Handling Of Cut Paper (AREA)
- Paper Feeding For Electrophotography (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、複写機、プリンタなど
の画像形成装置に適用される給紙装置に係り、特に、給
紙コロと逆転コロを圧接させ、呼び出しコロによつて給
紙部より送り出された用紙の重送時は、逆転コロ内部の
トルクリミツタの働きにより逆転コロを逆転させて、２
枚目以降の用紙を給紙部に戻す形式の給紙装置に関する
。[Field of Industrial Application] The present invention relates to a paper feeding device applied to image forming apparatuses such as copying machines and printers, and in particular, the present invention relates to a paper feeding device applied to image forming apparatuses such as copying machines and printers. When multiple sheets of paper are fed from each other, the torque limiter inside the reversing roller reverses the reversing roller and
The present invention relates to a paper feeding device that returns sheets after the first sheet to a paper feeding unit.
【０００２】0002
【従来の技術】給紙コロと逆転コロを圧接させ、呼び出
しコロによつて給紙部より送り出された用紙の重送時は
、逆転コロ内部のトルクリミツタの働きにより逆転コロ
を逆転させて、２枚目以降の用紙を給紙部に戻す形式の
給紙装置においては、不送り、多枚数送り等の不具合の
発生しない良好な給紙性能を発揮させるために、前記給
紙コロと逆転コロとを適宜な圧接力で当接させる必要が
ある。従来装置では、スプリング力等を利用して逆転コ
ロを加圧し、上記の当接圧を与えている。[Prior Art] A paper feed roller and a reversing roller are brought into pressure contact with each other, and when multiple sheets of paper are sent out from the paper feed section by a calling roller, the reversing roller is reversed by the action of a torque limiter inside the reversing roller, and the reversing roller is reversed. In a paper feeding device that returns subsequent sheets of paper to the paper feeding section, the paper feeding roller and the reversing roller are It is necessary to contact them with appropriate pressure. In conventional devices, the above-mentioned contact pressure is applied by pressurizing the reversing rollers using spring force or the like.
【０００３】図８は、従来例に係る給紙装置の側面図で
あり、１は給紙コロ、２は内部にトルクリミツタを設け
た逆転コロ、３は支点３ａを中心に回動自在で、先端部
に逆転コロ２を取り付けた支持部材、４は逆転コロ２の
下方の支持部材３の底面と基板５間に弾接されたコイル
ばねである。このコイルばね４の上方への付勢力を利用
して、逆転コロ２を給紙コロ１に圧接している。FIG. 8 is a side view of a conventional paper feeding device, in which 1 is a paper feeding roller, 2 is a reversing roller provided with an internal torque limiter, and 3 is rotatable around a fulcrum 3a, with a tip end. A support member 4 has a reversing roller 2 attached thereto, and 4 is a coil spring that is brought into elastic contact between the bottom surface of the support member 3 below the reversing roller 2 and the base plate 5. The upward biasing force of the coil spring 4 is used to press the reversing roller 2 against the paper feed roller 1.
【０００４】0004
【課題を解決するための手段】上記従来装置によれば、
狙いの当接圧を精度良く得るためには、ばね応力やその
取り付け部分の位置精度等を厳密に管理する必要がある
。しかしながら、給紙コロと逆転コロとの間は、用紙の
搬送経路であるため、双方の支持部分を一体的に構成す
ることは不可能であり、また、経時によるコロの摩擦が
必然的に発生するため、構成部品の寸法精度のばらつき
による当接圧のばらつきを厳密に管理することは困難で
ある。[Means for solving the problem] According to the above conventional device,
In order to obtain the desired contact pressure with high accuracy, it is necessary to strictly control the spring stress and the positional accuracy of the attachment part. However, since the space between the paper feed roller and the reversing roller is the paper conveyance path, it is impossible to configure the supporting parts of both in one piece, and friction between the rollers inevitably occurs over time. Therefore, it is difficult to strictly control variations in contact pressure due to variations in the dimensional accuracy of the component parts.
【０００５】一方、搬送される用紙の種類が異なる場合
、その紙間密着力も個々の紙種により異なるため、前記
給紙コロと逆転コロの当接圧の最適値も変化する場合が
あるため、その設定値を容易に変化させ得ることが望ま
しい。On the other hand, when the types of paper to be conveyed are different, the adhesion force between the sheets also differs depending on the individual paper types, so the optimal value of the contact pressure between the paper feed roller and the reversing roller may also change. It is desirable that the set value can be easily changed.
【０００６】本発明はこのような背景に基づいてなされ
たものであり、構成部品の精度や紙種の違いによる条件
の変化に関わりなく、常に最良の給紙性能を得ることが
できる給紙装置を提供することを目的とする。The present invention has been made based on this background, and provides a paper feeding device that can always obtain the best paper feeding performance regardless of the accuracy of component parts or changes in conditions due to differences in paper types. The purpose is to provide
【０００７】[0007]
【課題を解決するための手段】上記目的は、複写用紙を
機内へ搬送する給紙コロと、該給紙コロに当接し、複数
枚の用紙が搬送された場合に逆転して、２枚目以降の給
送を阻止するように構成された逆転コロと、該逆転コロ
を支点を中心に前記給紙コロに対して接離する方向に回
動自在に支持する支持部材とを有する給紙装置において
、前記支持部材の支点を挟んで、前記逆転コロの取付部
と反対側の前記支持部材に取り付けられ、その重量によ
り前記逆転コロを前記給紙コロに所定の給紙圧を以て圧
接させる加重部材を設けた第１の手段により達成される
。また上記目的は、第１の手段において、前記加重部材
の前記支持部材への取り付け位置を可変とした第２の手
段により達成される。さらに上記目的は、複写用紙を機
内へ搬送する給紙コロと、該給紙コロに当接し、複数枚
の用紙が搬送された場合に逆転して、２枚目以降の給送
を阻止するように構成された逆転コロと、該逆転コロを
支点を中心に前記給紙コロに対して接離する方向に回動
自在に支持する支持部材とを有する給紙装置において、
前記逆転コロを前記給紙コロに所定の給紙圧を以て圧接
させるように、前記支持部材を、その支点を中心として
前記逆転コロの取り付け部と反対側に重量配分を大きく
した構成とした第３の手段により達成される。[Means for Solving the Problems] The above object is to provide a paper feed roller that conveys copy paper into the machine, and a paper feed roller that contacts the paper feed roller and reverses when a plurality of sheets of paper are conveyed, so that the second copy A paper feeding device including a reversing roller configured to prevent subsequent feeding, and a support member that supports the reversing roller so as to be rotatable about a fulcrum in a direction toward and away from the paper feeding roller. a weighting member that is attached to the supporting member on the opposite side of the mounting portion of the reversing roller across the fulcrum of the supporting member, and presses the reversing roller against the paper feeding roller with a predetermined paper feeding pressure by its weight; This is achieved by the first means provided with. Further, the above object is achieved by a second means in which the attachment position of the weight member to the support member is variable in the first means. Furthermore, the above purpose is to provide a paper feed roller that conveys copy paper into the machine, and a mechanism that contacts the paper feed roller and reverses when multiple sheets of paper are conveyed, thereby preventing the feeding of the second and subsequent sheets. In a paper feeding device, the paper feeding device includes a reversing roller configured as shown in FIG.
A third structure in which the support member has a structure in which weight distribution is increased on the side opposite to the mounting portion of the reversing roller with respect to its fulcrum, so that the reversing roller is pressed into contact with the paper feeding roller with a predetermined paper feeding pressure. This is accomplished by the following means.
【０００８】[0008]
【作用】第１の手段においては、加重部材を支点を挟ん
で、逆転コロと反対側の支持部材に取り付け、この加重
部材の重量により、支持部材を回動変位させて、支持部
材の一端に取り付けられている逆転コロを所定の給紙圧
を以て給紙コロに当接させる。第２の手段においては、
この加重部材の取り付け位置を可変として、機械特性あ
るいは使用する用紙の特性に応じて常に最良の給紙性能
を得ている。第３の手段においては、逆転コロが給紙コ
ロに当接する方向に支持部材が回動するように、支点を
挟んで、逆転コロ側とその反対側との組成重量配分を変
えている。即ち、逆転コロの取り付け部と反対側の重量
配分を大きくしている。[Operation] In the first means, the weighted member is attached to the support member on the opposite side of the reversing roller across the fulcrum, and the weight of the weighted member causes the support member to be rotationally displaced so that one end of the support member is attached. The attached reversing roller is brought into contact with the paper feeding roller with a predetermined paper feeding pressure. In the second means,
By making the mounting position of this weighting member variable, the best paper feeding performance can always be obtained depending on the mechanical properties or the properties of the paper used. In the third means, the composition weight distribution is changed between the reverse roller side and the opposite side with the fulcrum in between, so that the support member rotates in the direction in which the reverse roller comes into contact with the paper feed roller. That is, the weight distribution on the side opposite to the mounting portion of the reversing roller is increased.
【０００９】[0009]
【実施例】以下、本発明の実施例を図面に基づき説明す
る。図３は複写機の全体構成図であり、１０は自動原稿
搬送部、１１は光学系、１２は画像形成部、１３は給紙
部、１４は排紙部である。画像形成部１２は、感光体ド
ラム１５と、この感光体ドラム１５の周囲に作像プロセ
ス順に配置された、帯電器１６、現像器１７、転写・分
離器１８、クリーニング器１９等から構成されている。
また、排紙部１４は、定着器２０を経て排紙される用紙
を仕分けるソータ２１で構成されている。Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. FIG. 3 is an overall configuration diagram of the copying machine, in which 10 is an automatic document transport section, 11 is an optical system, 12 is an image forming section, 13 is a paper feed section, and 14 is a paper discharge section. The image forming section 12 includes a photoreceptor drum 15, and a charger 16, a developer 17, a transfer/separator 18, a cleaning device 19, etc., which are arranged around the photoreceptor drum 15 in the order of the image forming process. There is. Further, the paper ejection unit 14 includes a sorter 21 that sorts the paper ejected through the fixing device 20.
【００１０】図４は、給紙部１３の駆動系を示す斜視図
であり、給紙信号が送られると給紙モータ６が回転し、
チエーン７により呼び出しコロ８、給紙コロ１へ駆動が
伝達される。呼び出しコロ８により呼び出された用紙は
給紙コロ１により画像形成部１２へと搬送される。また
、同時に逆転コロ２も連れ回りするが、複数枚の用紙が
搬送されようとすると、逆転して重送を防止する働きを
している。FIG. 4 is a perspective view showing the drive system of the paper feed section 13. When a paper feed signal is sent, the paper feed motor 6 rotates.
Drive is transmitted to the calling roller 8 and paper feeding roller 1 through the chain 7. The paper called out by the calling roller 8 is conveyed to the image forming section 12 by the paper feeding roller 1. At the same time, the reversing roller 2 also rotates, but when a plurality of sheets of paper are to be conveyed, it is reversed to prevent double feeding.
【００１１】図５は逆転コロ２の縦断面図であり、逆転
コロ２はトルクリミツタ３０を介して駆動軸３１と連結
されている。逆転コロ２に伝わるトルクが大きい時は、
コイルスプリング３２が開き、駆動軸３１との連結が解
かれる。また、トルクが小さい時は、駆動軸３１の回転
が逆転コロ２へ伝達される。この構成により用紙が１枚
送られた時は、図６に示すように、逆転コロ２と用の摩
擦力が大きいため、給紙コロ１の回転が用紙を介して逆
転コロ２に伝達され、コイルスプリング３２が開いて、
駆動軸３１との連結が解かれ、従つて逆転コロ２は用紙
を送る方向に回転する。これに対し、用紙が２枚以上送
られた時には、用紙と用紙の摩擦力が逆転コロ２の表面
のゴムと用紙の摩擦力に比べ小さいため、給紙コロ１の
回転は最上部の用紙には伝達されるが、下側の用紙には
ほとんど伝達されない。このため、コイルスプリング３
２は閉じたままとなり、駆動軸３１の回転が逆転コロ２
に伝達され、下側の用紙を戻す方向に逆転コロ２は回転
する。FIG. 5 is a longitudinal sectional view of the reversing roller 2, which is connected to a drive shaft 31 via a torque limiter 30. When the torque transmitted to reversing roller 2 is large,
The coil spring 32 opens and is disconnected from the drive shaft 31. Further, when the torque is small, the rotation of the drive shaft 31 is transmitted to the reversing roller 2. With this configuration, when one sheet of paper is fed, as shown in FIG. 6, since the frictional force between the reversing roller 2 and the paper feed roller 1 is large, the rotation of the paper feeding roller 1 is transmitted to the reversing roller 2 via the paper. The coil spring 32 opens,
The connection with the drive shaft 31 is released, and therefore the reversing roller 2 rotates in the paper feeding direction. On the other hand, when two or more sheets of paper are fed, the frictional force between the paper sheets is smaller than the frictional force between the rubber on the surface of the reversing roller 2 and the paper, so the rotation of the paper feed roller 1 is limited to the topmost sheet. is transmitted, but almost nothing is transmitted to the paper below. For this reason, coil spring 3
2 remains closed, and the rotation of the drive shaft 31 is reversed.
The reversing roller 2 rotates in the direction of returning the lower paper.
【００１２】以上のような動作が確実に行われるために
は、給紙コロ１と逆転コロ２とが適宜な圧力で当接して
いることが必要である。圧力が低すぎる時には、図６の
場合でも逆転コロ２に伝達されるトルクが小さくなり、
コイルスプリング３２が解除されずに用紙を送り切れな
い場合が発生する。反対に圧力が高すぎる時には、図７
の場合でもコイルスプリング３２が解除されたままとな
り、用紙を戻せないことがある。また、用紙間の摩擦力
あるいは密着力は紙種により異なるため、上記当接圧の
最適値も一定ではない。そのために、本発明では以下の
実施例に示す機構により、給紙ローラ１と逆転ローラ２
とを常に最適な給紙圧を以て当接させている。In order for the above-described operation to be carried out reliably, it is necessary that the paper feeding roller 1 and the reversing roller 2 are in contact with each other with appropriate pressure. When the pressure is too low, the torque transmitted to the reversing roller 2 becomes small even in the case of Fig. 6.
There may be cases where the coil spring 32 is not released and the paper cannot be completely fed. On the other hand, when the pressure is too high, Figure 7
Even in this case, the coil spring 32 remains released and the paper may not be able to be returned. Furthermore, since the frictional force or adhesion force between sheets varies depending on the type of paper, the optimum value of the above-mentioned contact pressure is also not constant. For this purpose, in the present invention, the paper feed roller 1 and the reversing roller 2 are
and are always brought into contact with each other with optimal paper feeding pressure.
【００１３】図１は第１の実施例に係る給紙装置の側面
図であり、支持部材３の支点３ａを挟んで、逆転ローラ
２の取り付け部と反対側の支持部材３の上面に、加重部
材３３を取り付けている。この加重部材３３の重量と、
支点３ａからの距離を調整して、給紙コロ１に対して逆
転コロ２が適宜の給紙圧（当接圧）を以て圧接するよう
に、支持部材３を反時計回り方向に回動付勢させる。FIG. 1 is a side view of the paper feeder according to the first embodiment. Member 33 is attached. The weight of this weighting member 33,
By adjusting the distance from the fulcrum 3a, the support member 3 is rotated and biased counterclockwise so that the reverse roller 2 comes into pressure contact with the paper feed roller 1 with an appropriate paper feed pressure (contact pressure). let
【００１４】また、加重部材３３の取り付け部３４を複
数個所設け、加重部材３３の取り付け位置を変えること
により、機械特性あるいは使用する用紙の特性に応じて
、給紙コロ１と逆転コロ２の給紙圧を複数選択可能にす
る。Furthermore, by providing a plurality of mounting portions 34 for the weighting member 33 and changing the mounting position of the weighting member 33, the feeding of the paper feed roller 1 and the reversing roller 2 can be adjusted according to the mechanical characteristics or the characteristics of the paper used. Make it possible to select multiple paper pressures.
【００１５】図２は第２の実施例に係る給紙装置の側面
図であり、この実施例においては、給紙コロ１と逆転コ
ロ２が適宜の給紙圧を以て圧接するように、支持部材３
を回動付勢するために、支点３ａを挟んで逆転コロ２の
取り付け部の反対側に、重量配分の大きい加重片３ｂを
形成している。FIG. 2 is a side view of a paper feeding device according to a second embodiment. In this embodiment, a support member is provided so that the paper feeding roller 1 and the reversing roller 2 come into pressure contact with each other with an appropriate paper feeding pressure. 3
In order to bias the rotationally, a weighting piece 3b with a large weight distribution is formed on the opposite side of the attachment part of the reversing roller 2 across the fulcrum 3a.
【００１６】[0016]
【発明の効果】以上説明したように、請求項１記載の発
明によれば、加重部材により、給紙コロと逆転コロの当
接圧を構成部品の精度等に影響されることなく一定に設
定、維持することができ、また請求項２記載の発明によ
れば、その設定を容易に変更することが可能なため、機
械特性あるいは私用する用紙の特性に応じて、常に最良
の給紙性能を得ることができる。また、請求項３記載の
発明によれば、給紙コロと逆転コロの当接圧を逆転コロ
の支持部材の重量配分により設定できるため、構成部品
の寸法精度、あるいはスプリング力等のばらつきといつ
た要因に影響を受けることなく、必要な圧力を精度よく
与えることが可能であり、また、経時でコロが摩耗する
ことにより圧力が変化することも防止できる。このため
、簡単な構成により、常に最良の給紙性能を得ることが
可能である。As explained above, according to the invention as set forth in claim 1, the contact pressure between the paper feeding roller and the reversing roller can be set constant without being affected by the precision of the component parts, etc., using the weight member. According to the invention set forth in claim 2, the settings can be easily changed, so that the best paper feeding performance can always be maintained depending on the mechanical characteristics or the characteristics of the paper used for personal use. can be obtained. Furthermore, according to the third aspect of the invention, the contact pressure between the paper feed roller and the reversing roller can be set by the weight distribution of the supporting member of the reversing roller. It is possible to apply the necessary pressure with high accuracy without being affected by other factors, and it is also possible to prevent changes in pressure due to wear of the rollers over time. Therefore, it is possible to always obtain the best paper feeding performance with a simple configuration.
【図１】本発明の第１の実施例に係る給紙装置の側面図
である。FIG. 1 is a side view of a paper feeding device according to a first embodiment of the present invention.
【図２】本発明の第２の実施例に係る給紙装置の側面図
である。FIG. 2 is a side view of a paper feeding device according to a second embodiment of the invention.
【図３】複写機の構成図である。FIG. 3 is a configuration diagram of a copying machine.
【図４】給紙部の駆動系の斜視図である。FIG. 4 is a perspective view of the drive system of the paper feed section.
【図５】逆転コロ部の縦断面図である。FIG. 5 is a longitudinal cross-sectional view of a reversing roller section.
【図６】用紙を１枚送るときの給紙装置の動作を示す模
式図である。FIG. 6 is a schematic diagram showing the operation of the paper feeding device when feeding one sheet of paper.
【図７】用紙を重送したときの給紙装置の動作を示す模
式図である。FIG. 7 is a schematic diagram showing the operation of the paper feeding device when paper is fed in duplicate.
【図８】従来例に係る給紙装置の側面図である。FIG. 8 is a side view of a paper feeding device according to a conventional example.
１ 給紙コロ ２ 逆転コロ ３ 支持部材 ３ａ 支点 ３ｂ 加重片 ３３ 加重部材 ３４ 取り付け部 1 Paper feed roller 2 Reverse roll 3 Support member 3a Fulcrum 3b Weighted piece 33 Weighted member 34 Mounting part
Claims (3)
、該給紙コロに当接し、複数枚の用紙が搬送された場合
に逆転して、２枚目以降の給送を阻止するように構成さ
れた逆転コロと、該逆転コロを支点を中心に前記給紙コ
ロに対して接離する方向に回動自在に支持する支持部材
とを有する給紙装置において、前記支持部材の支点を挟
んで、前記逆転コロの取付部と反対側の前記支持部材に
取り付けられ、その重量により前記逆転コロを前記給紙
コロに所定の給紙圧を以て圧接させる加重部材を設けた
ことを特徴とする給紙装置。Claim 1: A paper feed roller that conveys copy paper into the machine, and a roller that comes into contact with the paper feed roller and reverses when multiple sheets of paper are conveyed to prevent the feeding of the second and subsequent sheets. In a paper feed device having a reversing roller configured as shown in FIG. A weighting member is provided which is attached to the support member on the opposite side to the mounting portion of the reversing roller and presses the reversing roller against the paper feeding roller with a predetermined paper feeding pressure by its weight. Paper feed device.
の前記支持部材への取り付け位置を可変としたことを特
徴とする給紙装置。2. The paper feeding device according to claim 1, wherein the attachment position of the weight member to the support member is variable.
、該給紙コロに当接し、複数枚の用紙が搬送された場合
に逆転して、２枚目以降の給送を阻止するように構成さ
れた逆転コロと、該逆転コロを支点を中心に前記給紙コ
ロに対して接離する方向に回動自在に支持する支持部材
とを有する給紙装置において、前記逆転コロを前記給紙
コロに所定の給紙圧を以て圧接させるように、前記支持
部材を、その支点を中心として前記逆転コロの取り付け
部と反対側に重量配分を大きくした構成としたことを特
徴とする給紙装置。3. A paper feed roller that conveys copy paper into the machine, and a roller that comes into contact with the paper feed roller and reverses when multiple sheets of paper are conveyed to prevent the feeding of the second and subsequent sheets. A paper feeding device including a reversing roller configured to rotate, and a support member that supports the reversing roller so as to be rotatable about a fulcrum in a direction toward and away from the paper feeding roller. The paper feeding device is characterized in that the weight distribution of the support member is increased on the side opposite to the mounting portion of the reversing roller with respect to its fulcrum, so that the support member is brought into pressure contact with the paper roller with a predetermined paper feeding pressure. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3166124A JPH04365733A (en) | 1991-06-12 | 1991-06-12 | Paper feeder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3166124A JPH04365733A (en) | 1991-06-12 | 1991-06-12 | Paper feeder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04365733A true JPH04365733A (en) | 1992-12-17 |
Family
ID=15825479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3166124A Pending JPH04365733A (en) | 1991-06-12 | 1991-06-12 | Paper feeder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04365733A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0859005A (en) * | 1993-10-28 | 1996-03-05 | Ricoh Co Ltd | Paper separating device |
| US6042112A (en) * | 1996-11-20 | 2000-03-28 | Nec Corporaiton | Paper conveyer for image recording apparatus |
-
1991
- 1991-06-12 JP JP3166124A patent/JPH04365733A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0859005A (en) * | 1993-10-28 | 1996-03-05 | Ricoh Co Ltd | Paper separating device |
| US6042112A (en) * | 1996-11-20 | 2000-03-28 | Nec Corporaiton | Paper conveyer for image recording apparatus |
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