JP3740241B2 - Sheet feeding apparatus and image forming apparatus - Google Patents

Sheet feeding apparatus and image forming apparatus Download PDF

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Publication number
JP3740241B2
JP3740241B2 JP04376797A JP4376797A JP3740241B2 JP 3740241 B2 JP3740241 B2 JP 3740241B2 JP 04376797 A JP04376797 A JP 04376797A JP 4376797 A JP4376797 A JP 4376797A JP 3740241 B2 JP3740241 B2 JP 3740241B2
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JP
Japan
Prior art keywords
sheet feeding
shaft member
friction roller
shaft
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.)
Expired - Fee Related
Application number
JP04376797A
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Japanese (ja)
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JPH10236673A (en
Inventor
豊 久保地
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
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Filing date
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Application filed by Canon Inc filed Critical Canon Inc
Priority to JP04376797A priority Critical patent/JP3740241B2/en
Publication of JPH10236673A publication Critical patent/JPH10236673A/en
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  • Sheets, Magazines, And Separation Thereof (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、プリンタ、ファクシミリ、複写機等の画像形成装置、及び画像形成装置においてシートを給送するためのシート給送装置に関するものである。
【0002】
【従来の技術】
図7は、画像形成装置の1例であるレーザプリンタの装置本体の断面図である。このレーザプリンタは給紙トレイ23と中板24、一部切欠された半月状の給紙ローラ25からなるシート給送装置を備えている。給紙トレイ23に積載されたシートは、給紙ローラ25、搬送ローラ、レジストローラ26等にによって画像形成装部へ給送される。画像形成部は、レーザ露光により潜像を電子写真方式で形成する感光ドラム30を有し、該潜像は現像手段により現像剤即ちトナーにより現像され、該現像された現像像を転写手段31により転写されたシートは定着手段32に搬送され、そこで現像剤像を加熱定着される。その後シートは排出ローラ33等により排出トレイ34に排出される。
【0003】
図8は従来のプリンタのシート給送装置の1例を示す。
【0004】
24は中板であって、この上に印字前のシート材41が積載される。給紙軸42が回転するに従い、加圧バネ43により下から加圧された中板24は上昇し、シート材41は給紙ローラ25に押し付けられる。給紙ローラ25はゴム、樹脂等の弾性の摩擦部材で出来ており、摩擦の力を利用して一番上に積載されたシート材を給送する。複数枚のシート材が一度に給送された場合は分離パッド45によってシート材は分離され、一番上のシート材1枚だけが画像形成部に送り込まれる。
【0005】
【発明が解決しようとする課題】
ところが、上記従来例においては次のような問題点を有していた。
【0006】
印字速度が遅く、製品寿命も短い装置においては、給紙ローラ25の寿命が装置の寿命よりも長いために給紙ローラを交換する必要はない。しかしながら、印字速度が速く、製品寿命も長い装置においては、給紙ローラのゴム等は摩耗等によって劣化し、給紙性能の低下を引き起こすため、給紙ローラの定期的な交換が避けられない。
【0007】
その際、従来のシート給送装置においては図9に示すように給紙軸42が給紙ローラ25を貫通しており、しかもその両端部は画像形成装置本体に固定されているため、給紙ローラを交換する場合には一旦給紙角軸を画像形成装置本体から外し、その後に給紙ローラ20を給紙軸42の端から抜きとらなければならず、非常に大きな手間と労力を必要としていた。シートの種類に最適の給紙ローラを選択使用したい場合も同様の困難性があった。
【0008】
本出願に係る発明の目的は、給紙性能の低下した給紙ローラを容易に交換できる機構をもつシート給送装置及び画像形成装置を提供することにある。
【0012】
上記目的を達成するため、第1の発明のシート給送装置は、円形部と切欠部を有し断面形状が半月状の摩擦ローラ部と、該摩擦ローラ部の挿通穴に挿通されて該摩擦ローラ部を支持する異形断面の軸部材を有し、シートを給送するための給紙ローラを有するシート給送装置において、前記摩擦ローラ部は、その挿通穴を異形断面とされるとともに該挿通穴から切欠部外へ連通し軸部材を通過させ得る溝が形成され、該摩擦ローラ部の両側に、前記異形断面と同形の断面形状のボスを相対向する面に形成され、かつ軸部材の断面形状と同形状の穴に軸部材が挿通され分離手段を作動する給紙ローラカムが配設され、該給紙ローラカムにより摩擦ローラ部を軸部材に対し相対回転不能に固定したことを特徴とする。
【0013】
の発明は、前記給紙ローラカムは固定手段により軸部材に固定され、固定手段の固定を解除した場合、給紙ローラカムの軸方向の移動を可能にすることを特徴とする。
【0014】
の発明は、前記固定手段は、軸部材に設けられた凹所と、一方の給紙ローラカムの外側に設けられ前記凹所に係脱自在に係合される爪とからなることを特徴とする。
【0015】
の発明は、前記軸部材は、角軸であることを特徴とする。
【0016】
の発明は、前記軸部材は、Dカット面を有する丸軸であることを特徴とする。
【0017】
の発明の画像形成装置は、上記いずれかのシート給送装置と、該シート給送装置により給送されるシートに画像を形成する画像形成部を有することを特徴とする。
【0018】
【発明の実施の形態】
(第1の実施例)
図1は本発明に係るシート給送装置の1実施例の構成図である。シート積載用の中板1の両側部はバネ7の力により給紙カム2a、2bに押し付けられている。該給紙カム2a、2bは給紙角軸3の両端部に取り付けられている。給紙角軸3の中央部にはゴム等の摩擦ローラ部4が設けられ、さらにその両側に給紙ローラカム5、6が設けられており、該給紙ローラカムは、シートを分離する分離手段としての分離パッド(図示せず)を非給紙時に押し下げ、給紙時にその押し下げを解除して分離パッドを摩擦ローラ部に押圧するように作動させる。また給紙角軸3、摩擦ローラ部4により給紙ローラを構成する。
【0019】
シート給送時には給紙角軸3が回転を始め、給紙カム2が回転するに従い加圧バネ7により下から加圧された中板1が上昇する。中板上に積載されたシートは、前記従来例と同様に弾性及び摩擦性を有する摩擦ローラ部4に押し当てられ、回転する該摩擦ローラ部4との摩擦により、例えば図7に示すような画像形成部に給送される。このようなシート給送動作を繰り返すうちに、摩擦ローラ部4は摩耗劣化し、摩擦ローラ部とシートとの間の摩擦抵抗が低下し、シート給送性能に支障をきたすようになる。そのために、摩擦ローラ部はある一定以上の期間を経たら新品と交換をする必要が生じる。
【0020】
本実施例では、摩擦ローラ部の交換は以下のようにして行うことができる。
【0021】
図2に示すように、一方の給紙ローラカム(左)5は給紙角軸3の係止部9に突き当てられ軸方向移動を固定されている。他方の給紙ローラカム(右)6は給紙角軸3上に、軸方向の移動に対し固定したり解除自在の固定手段により固定されている。本実施例では、該固定手段は給紙ローラカム6の外側に設けられた弾性の係止爪11、給紙角軸3に穿設され係止爪11に係合する凹所12により構成される。また、各給紙ローラカム5、6の互いに向き合う内側には、円形以外の異形の断面形状、本実施例では正方形の断面形状を有するボス13、14が設けられている。
【0022】
摩擦ローラ部4の断面形状は、図4に示すように円形部16と該円形から一部切り欠かれた切り欠き部17からなる略半月形をしており、円形部16はシートに係合するシート給送部となり、切り欠き部17はシート給送に寄与しない非給送部となる。該摩擦ローラ部は芯金と外周の弾性摩擦部材で構成することが好ましい。また、給紙角軸3が挿通される中心部に前記ボス部13、14が嵌合する異形の嵌合穴18が形成され、該嵌合穴からローラ表面に連通し給紙角軸3が通過し得る幅の溝19が形成され、略C字形の断面形状を有する。
【0023】
図3に示すように爪11と係合凹所12の係合を解除することにより、給紙ローラカム(右)6を給紙角軸3の上をカム5から離間する方向にずらすことが可能となり、給紙ローラカム(左)5、(右)6と摩擦ローラ部4の嵌合を解除する。
【0024】
摩擦ローラ部4は図4に示すように断面形状が略C字形になっているため、給紙ローラカムのボス13、14と摩擦ローラ部の異形穴18との嵌合が外れると、摩擦ローラ部4はその溝19に給紙角軸3を通過させることにより、給紙角軸3から取り外すことができる。従って、給紙角軸3をプリンタ本体に取り付けたままで、給紙角軸3から使用済の摩擦ローラ部4を取り外し、新品と交換することができる。
【0025】
上記と全く逆の手順により新品の摩擦ローラ部4を給紙角軸3に取り付けることができる。取付けが終わると、給紙角軸3の回転は、異形のボス13、14と穴18との係合により給紙角軸3の回転が摩擦ローラ部4に伝達される。
【0026】
なお、本発明の固定解除自在の固定手段は、上記のような爪と係合凹所の外、ピンとこれを通す挿通孔、給紙角軸3に設けられたねじと該ねじに螺合するナット等種々の手段を適用することができる。
【0027】
(第2の実施例)
本発明は上記第1の実施例に限定されず、さまざまな他の実施例が考えられる。
【0028】
本実施例では、図5に示すように、給紙角軸3を摩擦ローラ部4の開口部25に嵌合し、さらにビス26締めをすることによって、摩擦ローラ部4を給紙角軸3に固定することができる。そして、ビス26を緩めることにより摩擦ローラ部4を給紙角軸3から取り外し、その交換を容易に行うことが可能である。本実施例では、摩擦ローラ4は、ビスが螺合し得る剛性の芯金とその外周を被覆するゴム等の弾性摩擦片とで構成される。
【0029】
(第3の実施例)
さらに第3の実施例について説明する。
【0030】
本発明は上記第1、第2の実施例のように、給紙角軸に取り付ける摩擦ローラ部にとどまらず、丸軸の場合にも適用が可能である。
【0031】
本実施例では、図6に示すように、丸軸30にDカット面31を設け、給紙ローラカム32の回り止めとする。そして第1の実施例同様、給紙ローラカム内側のボス33と摩擦ローラ部34の穴35との係合により両者の回り止めがなされる。
【0032】
以上の各実施例において、摩耗等で機能が低下したり、シート種類に応じた摩擦ローラ部を必要とする場合、摩擦ローラ部の溝を給紙角軸を通過させることにより、容易に摩擦ローラ部を交換することができる。また、摩擦ローラ部の交換を行うことにより画像形成装置の寿命を長くすることが可能になる。
【0033】
なお、本発明は、摩擦ローラ部を支持する軸として、上記実施例のような給紙角軸やDカットを有する丸軸の外に、断面多角形や楕円形等、異形断面の軸を使用することができる。
【0034】
【発明の効果】
以上説明したように、本発明によれば、軸部材を摩擦ローラ部に形成した溝を通過させてることにより、摩擦ローラ部を軸部材から取り外すことができるので、軸部材を画像形成装置本体等の支持部から外さずに、機能の低下した摩擦ローラ部の交換を容易に行うことができる。
【0035】
また、画像形成装置に使用するシート材の種類(海外紙、OHT等)に応じて、給紙ローラを適切な物に即座に交換することができる。
【図面の簡単な説明】
【図1】本発明の第1の実施例に係る給紙ローラの正面図
【図2】本発明の第1の実施例に係る給紙ローラの斜視図
【図3】本発明の第1の実施例に係る給紙ローラの分解説明図
【図4】本発明の第1の実施例に係る摩擦ローラと給紙角軸の断面図
【図5】本発明の第2の実施例に係る摩擦ローラと給紙角軸の断面図
【図6】本発明の第3の実施例に係る給紙ローラの斜視図
【図7】従来例を示す画像形成装置全体の断面図
【図8】従来例を示す給紙ローラの断面図
【図9】従来例を示す給紙角軸と摩擦ローラ部の斜視図
【符号の説明】
1…中板 2…給紙カム
3…給紙角軸 4…半月形摩擦ローラ
5、6…給紙ローラカム 7…加圧バネ
9…突起 11…爪
12…係合凹所 13、14…ボス
18…嵌合穴 19…溝
25…開口 26…ビス
30…丸軸 31…カット面
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image forming apparatus such as a printer, a facsimile machine, and a copying machine, and a sheet feeding apparatus for feeding sheets in the image forming apparatus.
[0002]
[Prior art]
FIG. 7 is a cross-sectional view of an apparatus main body of a laser printer which is an example of an image forming apparatus. This laser printer includes a sheet feeding device including a sheet feeding tray 23, an intermediate plate 24, and a half-moon-shaped sheet feeding roller 25 partially cut away. The sheets stacked on the paper feed tray 23 are fed to the image forming unit by a paper feed roller 25, a transport roller, a registration roller 26, and the like. The image forming unit has a photosensitive drum 30 for forming a latent image by electrophotography with laser exposure. The latent image is developed by a developer, ie, toner, by a developing unit, and the developed image is developed by a transfer unit 31. The transferred sheet is conveyed to the fixing unit 32 where the developer image is heated and fixed. Thereafter, the sheet is discharged to a discharge tray 34 by a discharge roller 33 or the like.
[0003]
FIG. 8 shows an example of a sheet feeding device of a conventional printer.
[0004]
Reference numeral 24 denotes an intermediate plate on which the sheet material 41 before printing is stacked. As the sheet feed shaft 42 rotates, the intermediate plate 24 pressed from below by the pressure spring 43 rises, and the sheet material 41 is pressed against the sheet feed roller 25. The paper feed roller 25 is made of an elastic friction member such as rubber or resin, and feeds the sheet material stacked on the top by using the frictional force. When a plurality of sheet materials are fed at a time, the sheet material is separated by the separation pad 45, and only the uppermost sheet material is fed into the image forming unit.
[0005]
[Problems to be solved by the invention]
However, the conventional example has the following problems.
[0006]
In an apparatus with a slow printing speed and a short product life, it is not necessary to replace the paper feed roller because the life of the paper feed roller 25 is longer than the life of the apparatus. However, in an apparatus having a high printing speed and a long product life, rubber or the like of the paper feed roller is deteriorated due to wear or the like and causes a reduction in paper feed performance, so that periodic replacement of the paper feed roller is inevitable.
[0007]
At that time, in the conventional sheet feeding apparatus, as shown in FIG. 9, the sheet feeding shaft 42 passes through the sheet feeding roller 25 and both ends thereof are fixed to the image forming apparatus main body. When exchanging the rollers, it is necessary to remove the paper feed angular shaft from the main body of the image forming apparatus and then remove the paper feed roller 20 from the end of the paper feed shaft 42, which requires a great deal of labor and labor. It was. There is a similar difficulty when it is desired to select and use an optimum sheet feeding roller for a sheet type.
[0008]
An object of the invention according to the present application is to provide a sheet feeding apparatus and an image forming apparatus having a mechanism capable of easily exchanging a sheet feeding roller having a lowered sheet feeding performance.
[0012]
In order to achieve the above object, a sheet feeding device according to a first aspect of the present invention includes a friction roller portion having a circular portion and a cutout portion and a half-moon-shaped cross section, and the friction roller portion inserted through the insertion hole of the friction roller portion. In the sheet feeding apparatus having a shaft member having a modified cross section for supporting the roller section and having a sheet feeding roller for feeding the sheet, the friction roller section has a modified cross section in the insertion hole and the insertion section. Grooves that allow the shaft member to pass from the hole to the outside of the notch portion are formed, bosses having a cross-sectional shape that is the same shape as the deformed cross section are formed on opposite sides of the friction roller portion, and the shaft member The shaft member is inserted into a hole having the same shape as the cross-sectional shape, and a feed roller cam for operating the separating means is disposed, and the friction roller portion is fixed to the shaft member so as not to rotate relative to the shaft member by the feed roller cam. .
[0013]
According to a second aspect of the present invention, the sheet feeding roller cam is fixed to the shaft member by a fixing means, and when the fixing means is released, the sheet feeding roller cam can be moved in the axial direction.
[0014]
In a third aspect of the invention, the fixing means includes a recess provided in the shaft member and a claw provided outside the one paper feed roller cam and detachably engaged with the recess. And
[0015]
According to a fourth aspect of the invention, the shaft member is an angular axis.
[0016]
In a fifth aspect of the present invention, the shaft member is a round shaft having a D-cut surface.
[0017]
An image forming apparatus according to a sixth aspect of the present invention includes any one of the above sheet feeding apparatuses and an image forming unit that forms an image on a sheet fed by the sheet feeding apparatus.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
FIG. 1 is a configuration diagram of an embodiment of a sheet feeding apparatus according to the present invention. Both side portions of the sheet stacking middle plate 1 are pressed against the sheet feeding cams 2 a and 2 b by the force of the spring 7. The sheet feeding cams 2 a and 2 b are attached to both ends of the sheet feeding angular shaft 3. A friction roller section 4 made of rubber or the like is provided at the center of the sheet feeding angular shaft 3, and sheet feeding roller cams 5 and 6 are provided on both sides thereof. The sheet feeding roller cam serves as a separating means for separating sheets. The separation pad (not shown) is pushed down when not feeding, and the depression is released when feeding and the separation pad is operated to press against the friction roller portion. The sheet feeding roller is constituted by the sheet feeding angular shaft 3 and the friction roller section 4.
[0019]
When the sheet is fed, the sheet feeding angular shaft 3 starts rotating, and as the sheet feeding cam 2 rotates, the intermediate plate 1 pressurized from below by the pressure spring 7 rises. As shown in FIG. 7, the sheets stacked on the intermediate plate are pressed against the friction roller portion 4 having elasticity and friction as in the conventional example, and friction with the rotating friction roller portion 4 It is fed to the image forming unit. As the sheet feeding operation is repeated, the friction roller portion 4 is worn and deteriorated, and the frictional resistance between the friction roller portion and the sheet is lowered, thereby hindering the sheet feeding performance. Therefore, the friction roller portion needs to be replaced with a new one after a certain period of time.
[0020]
In the present embodiment, the friction roller portion can be replaced as follows.
[0021]
As shown in FIG. 2, one sheet feeding roller cam (left) 5 is abutted against the engaging portion 9 of the sheet feeding angular shaft 3 and is fixed in the axial movement. The other sheet feeding roller cam (right) 6 is fixed on the sheet feeding angular shaft 3 by fixing means that can be fixed or released with respect to axial movement. In this embodiment, the fixing means is constituted by an elastic locking claw 11 provided outside the paper feed roller cam 6 and a recess 12 formed in the paper feed angular shaft 3 to engage with the locking claw 11. . In addition, bosses 13 and 14 having irregular cross-sectional shapes other than circular shapes, in this embodiment, square cross-sectional shapes, are provided on the inner sides of the respective feed roller cams 5 and 6 facing each other.
[0022]
As shown in FIG. 4, the friction roller portion 4 has a substantially half-moon shape including a circular portion 16 and a notched portion 17 partially cut out from the circular shape, and the circular portion 16 is engaged with the sheet. The cutout portion 17 becomes a non-feeding portion that does not contribute to sheet feeding. The friction roller portion is preferably composed of a metal core and an outer peripheral elastic friction member. Further, an odd-shaped fitting hole 18 into which the boss portions 13 and 14 are fitted is formed at the center portion through which the feeding angle shaft 3 is inserted, and the feeding angle shaft 3 communicates with the roller surface from the fitting hole. A groove 19 having a width that can pass therethrough is formed, and has a substantially C-shaped cross-sectional shape.
[0023]
As shown in FIG. 3, by releasing the engagement between the claw 11 and the engagement recess 12, the paper feed roller cam (right) 6 can be shifted in the direction away from the cam 5 on the paper feed angular shaft 3. Thus, the engagement between the paper feed roller cams (left) 5 and (right) 6 and the friction roller unit 4 is released.
[0024]
Since the friction roller portion 4 has a substantially C-shaped cross section as shown in FIG. 4, when the bosses 13 and 14 of the paper feed roller cam and the deformed hole 18 of the friction roller portion are disengaged, the friction roller portion 4 can be removed from the sheet feeding angle shaft 3 by passing the sheet feeding angle shaft 3 through the groove 19. Therefore, it is possible to remove the used friction roller portion 4 from the sheet feeding angle shaft 3 and replace it with a new one while the sheet feeding angle shaft 3 is attached to the printer body.
[0025]
A new friction roller portion 4 can be attached to the sheet feeding angular shaft 3 by a procedure reverse to the above. When the attachment is completed, the rotation of the sheet feeding angular shaft 3 is transmitted to the friction roller unit 4 by the engagement of the irregularly shaped bosses 13 and 14 and the hole 18.
[0026]
In addition, the fixing means of the present invention that can be freely released is engaged with the screw and the screw provided on the paper feeding angle shaft 3 outside the above-mentioned claw and engaging recess, the pin and the insertion hole through which the pin passes. Various means such as a nut can be applied.
[0027]
(Second embodiment)
The present invention is not limited to the first embodiment, and various other embodiments are possible.
[0028]
In this embodiment, as shown in FIG. 5, the feeding roller shaft 4 is fitted into the opening 25 of the friction roller portion 4 and further tightened with screws 26, whereby the friction roller portion 4 is moved to the feeding angle shaft 3. Can be fixed to. Then, by loosening the screw 26, it is possible to remove the friction roller portion 4 from the sheet feeding angular shaft 3 and easily replace it. In this embodiment, the friction roller 4 is composed of a rigid core bar to which a screw can be screwed and an elastic friction piece such as rubber covering the outer periphery thereof.
[0029]
(Third embodiment)
Further, a third embodiment will be described.
[0030]
The present invention is not limited to the friction roller portion attached to the sheet feeding angular shaft as in the first and second embodiments, but can be applied to a round shaft.
[0031]
In this embodiment, as shown in FIG. 6, a D-cut surface 31 is provided on the round shaft 30 to prevent rotation of the paper feed roller cam 32. As in the first embodiment, the boss 33 on the inner side of the paper feed roller cam and the hole 35 of the friction roller portion 34 are engaged to prevent the rotation of both.
[0032]
In each of the above-described embodiments, when the function is deteriorated due to wear or the like, or the friction roller portion corresponding to the sheet type is required, the friction roller can be easily obtained by passing the groove of the friction roller portion through the sheet feeding angular axis. Parts can be exchanged. Further, the life of the image forming apparatus can be extended by exchanging the friction roller portion.
[0033]
In addition, the present invention uses a shaft with a deformed cross section such as a polygonal cross section or an elliptical shape in addition to the feed shaft and the D-cut round shaft as in the above embodiment as the shaft for supporting the friction roller portion. can do.
[0034]
【The invention's effect】
As described above, according to the present invention, the friction roller portion can be removed from the shaft member by passing the shaft member through the groove formed in the friction roller portion. It is possible to easily replace the friction roller portion having a reduced function without removing it from the support portion.
[0035]
In addition, the paper feed roller can be immediately replaced with an appropriate one according to the type of sheet material (overseas paper, OHT, etc.) used in the image forming apparatus.
[Brief description of the drawings]
FIG. 1 is a front view of a paper feed roller according to a first embodiment of the present invention. FIG. 2 is a perspective view of a paper feed roller according to the first embodiment of the present invention. FIG. 4 is an exploded explanatory view of a paper feed roller according to an embodiment. FIG. 4 is a sectional view of a friction roller and a paper feed angular shaft according to a first embodiment of the present invention. FIG. 6 is a perspective view of a sheet feeding roller according to a third embodiment of the present invention. FIG. 7 is a sectional view of the entire image forming apparatus showing a conventional example. FIG. FIG. 9 is a perspective view of a paper feed angular shaft and a friction roller portion showing a conventional example.
DESCRIPTION OF SYMBOLS 1 ... Middle plate 2 ... Paper feed cam 3 ... Paper feed angular shaft 4 ... Half-moon friction roller 5, 6 ... Paper feed roller cam 7 ... Pressure spring 9 ... Protrusion 11 ... Claw 12 ... Engagement recess 13, 14 ... Boss 18 ... fitting hole 19 ... groove 25 ... opening 26 ... screw 30 ... round shaft 31 ... cut surface

Claims (6)

円形部と切欠部を有し断面形状が半月状の摩擦ローラ部と、該摩擦ローラ部の挿通穴に挿通されて該摩擦ローラ部を支持する異形断面の軸部材を有し、シートを給送するための給紙ローラを有するシート給送装置において、前記摩擦ローラ部は、その挿通穴を異形断面とされるとともに該挿通穴から切欠部外へ連通し軸部材を通過させ得る溝が形成され、該摩擦ローラ部の両側に、前記異形断面と同形の断面形状のボスを相対向する面に形成され、かつ軸部材の断面形状と同形状の穴に軸部材が挿通され分離手段を作動する給紙ローラカムが配設され、該給紙ローラカムにより摩擦ローラ部を軸部材に対し相対回転不能に固定したことを特徴とするシート給送装置。  It has a circular roller part and a cutout part, and has a semicircular friction roller part, and a shaft member with an irregular cross section that is inserted into the insertion hole of the friction roller part to support the friction roller part, and feeds the sheet. In the sheet feeding apparatus having a sheet feeding roller, the friction roller portion has an insertion hole with a deformed cross section, and a groove that allows the shaft member to pass from the insertion hole to the outside of the notch is formed. The bosses having the same cross-sectional shape as that of the deformed cross-section are formed on opposite sides of the friction roller portion, and the shaft member is inserted into the hole having the same shape as the cross-sectional shape of the shaft member to operate the separating means. A sheet feeding apparatus comprising: a sheet feeding roller cam, and a friction roller portion fixed to the shaft member so as not to rotate relative to the shaft member. 前記給紙ローラカムは固定手段により軸部材に固定され、固定手段の固定を解除した場合、給紙ローラカムの軸方向の移動を可能にすることを特徴とする請求項記載のシート給送装置。2. The sheet feeding apparatus according to claim 1 , wherein the sheet feeding roller cam is fixed to the shaft member by a fixing means, and when the fixing means is released, the sheet feeding roller cam can be moved in the axial direction. 前記固定手段は、軸部材に設けられた凹所と、一方の給紙ローラカムの外側に設けられ前記凹所に係脱自在に係合される爪とからなることを特徴とする請求項記載のシート給送装置。It said fixing means includes a recess provided on the shaft member, according to claim 2, characterized in that consisting of one paper feed pawl disengaged is engaged freely engaged in the recess provided on the outside of the roller cam Sheet feeding device. 前記軸部材は、角軸であることを特徴とする請求項1乃至のいずれかに記載のシート給送装置。The shaft member, a sheet feeding apparatus according to any one of claims 1 to 3, characterized in that the square shaft. 前記軸部材は、Dカット面を有する丸軸であることを特徴とする請求項1乃至のいずれかに記載のシート給送装置。The shaft member, a sheet feeding apparatus according to any one of claims 1 to 4, characterized in that a round shaft having a D-cut surface. 請求項1乃至のいずれかに記載のシート給送装置と、該シート給送装置により給送されるシートに画像を形成する画像形成部を有することを特徴とする画像形成装置。A sheet feeding apparatus according to any one of claims 1 to 5, the image forming apparatus characterized by having an image forming unit for forming an image on a sheet fed by said sheet feeding apparatus.
JP04376797A 1997-02-27 1997-02-27 Sheet feeding apparatus and image forming apparatus Expired - Fee Related JP3740241B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
JP04376797A JP3740241B2 (en) 1997-02-27 1997-02-27 Sheet feeding apparatus and image forming apparatus

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JP3740241B2 true JP3740241B2 (en) 2006-02-01

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Publication number Priority date Publication date Assignee Title
KR100724877B1 (en) 2003-06-27 2007-06-04 세이코 엡슨 가부시키가이샤 Paper supply device
JP4622661B2 (en) * 2004-05-14 2011-02-02 セイコーエプソン株式会社 Paper feeding device and paper feeding method
JP5659656B2 (en) * 2010-09-22 2015-01-28 富士ゼロックス株式会社 Recording medium conveying apparatus and image forming apparatus
JP7275704B2 (en) 2019-03-19 2023-05-18 株式会社リコー Conveyance control device and image reading device

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