JPH0891598A - Paper sheet feed device - Google Patents

Paper sheet feed device

Info

Publication number
JPH0891598A
JPH0891598A JP25623894A JP25623894A JPH0891598A JP H0891598 A JPH0891598 A JP H0891598A JP 25623894 A JP25623894 A JP 25623894A JP 25623894 A JP25623894 A JP 25623894A JP H0891598 A JPH0891598 A JP H0891598A
Authority
JP
Japan
Prior art keywords
roller
hopper plate
paper
recording paper
recording
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
Application number
JP25623894A
Other languages
Japanese (ja)
Inventor
Takeshi Hirano
毅 平野
Original Assignee
Nec Corp
日本電気株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nec Corp, 日本電気株式会社 filed Critical Nec Corp
Priority to JP25623894A priority Critical patent/JPH0891598A/en
Publication of JPH0891598A publication Critical patent/JPH0891598A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To provide a paper sheet feed device of high reliability by preventing a pick miss. CONSTITUTION: This paper sheet feed device 1 is constituted of a hopper plate 13 loading recording paper P, a lift up spring 15 energizing the hopper plate 13 from the lower side to the upper side, and a pick roller 17 arranged on the upper side of the hopper plate 13 so as to contact with the recording paper. The pick roller 17 is formed into an elliptical cylindrical shape, rotated centering around a shaft 19, and the uppermost paper sheet of the recording paper P is sent out in the arrow mark direction by the rotation. The hopper plate 13 is moved up and down by rotation of the roller 17.

Description

【発明の詳細な説明】Detailed Description of the Invention
【0001】[0001]
【産業上の利用分野】本発明は画像形成装置などに用い
られる給紙装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device used in an image forming apparatus or the like.
【0002】[0002]
【従来の技術】プリンタや複写機などの画像形成装置に
は、画像が形成される記録紙を装置内へ供給するための
給紙装置が装備されている。
2. Description of the Related Art An image forming apparatus such as a printer or a copying machine is equipped with a sheet feeding device for feeding a recording sheet on which an image is formed into the apparatus.
【0003】従来の給紙装置としては、ホッパプレート
と呼ばれる截置板上に記録紙をセットし記録紙を最上頁
からピックローラとよばれる回転ローラで1枚ずつ送る
ものが知られている(例えば特開平3−192041号
公報参照)。この種の装置においてはホッパプレートの
下にスプリング等の付勢手段が設けられてホッパプレー
トを常時上方向に付勢して記録紙がピックローラと当接
するようにし、記録紙が1枚送られると、ホッパプレー
トは記録紙1枚の厚さ分だけ上昇し次の記録紙がピック
ローラと当接する。
As a conventional paper feeding device, there is known one in which recording paper is set on a stacking plate called a hopper plate and the recording papers are fed one by one from the top page by a rotary roller called a pick roller ( See, for example, JP-A-3-192041). In this type of apparatus, a biasing means such as a spring is provided under the hopper plate to constantly bias the hopper plate upward so that the recording paper abuts on the pick roller, and one recording paper is fed. Then, the hopper plate is raised by the thickness of one recording sheet, and the next recording sheet comes into contact with the pick roller.
【0004】[0004]
【発明が解決しようとする課題】従来の装置において
は、記録紙の減少に応じてホッパプレートが円滑に上昇
して記録紙とピックローラとの圧接を維持していくこと
が前提とされているが、実際にはホッパプレートの動き
は必ずしもスムーズではなく、摩擦やその他の理由によ
りある位置に引っ掛かってしまい、それによってピック
ローラと記録紙との圧接力が低下して、ピックミスを発
生し易いという問題があった。
In the conventional apparatus, it is premised that the hopper plate smoothly rises in accordance with the decrease of the recording paper to maintain the pressure contact between the recording paper and the pick roller. However, in reality, the movement of the hopper plate is not always smooth, and the hopper plate is caught at a certain position due to friction or other reasons, which reduces the pressure contact force between the pick roller and the recording paper, which easily causes a pick error. There was a problem.
【0005】[0005]
【課題を解決するための手段】上記課題を解決するた
め、本発明においては、記録紙を截置する截置板と、截
置板を記録紙の截置されない側から記録紙の截置される
側へ付勢する付勢手段と、截置板の記録紙の截置される
側に記録紙と当接するように配置された給紙ローラとに
よって給紙装置を構成し、給紙ローラは、その回転中心
から周縁までの距離が一定にならないように形成した。
In order to solve the above problems, according to the present invention, a placement plate for placing the recording paper, and a placement plate for placing the recording paper from the side where the recording paper is not placed. And a sheet feeding roller arranged so as to contact the recording sheet on the side of the recording sheet on which the recording sheet is placed. , So that the distance from the center of rotation to the peripheral edge is not constant.
【0006】[0006]
【作用】給紙ローラを回転させると、その回転中心から
周縁までの距離が一定でないので、截置板は給紙ローラ
に追従して揺動し、摩擦などによって引っ掛かることは
ない。
When the paper feed roller is rotated, the distance from the center of rotation to the peripheral edge is not constant, so that the placement plate swings following the paper feed roller and is not caught by friction or the like.
【0007】[0007]
【実施例】以下本発明について図面を参照して説明す
る。図1は、本発明による給紙装置の一実施例の外略
図、図2は図1の給紙装置を組み込んだ画像形成装置
(電子写真プリンタ)の全体図である。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of an embodiment of a paper feeding device according to the present invention, and FIG. 2 is an overall view of an image forming apparatus (electrophotographic printer) incorporating the paper feeding device of FIG.
【0008】図2の装置は、給紙装置1と、記録紙の搬
送路3と、搬送路3の途中に配置された感光部5および
転写部7と、定着部9と、排紙部11とから構成され
る。
The apparatus shown in FIG. 2 has a sheet feeding device 1, a recording sheet conveying path 3, a photosensitive section 5 and a transfer section 7 arranged in the middle of the conveying path 3, a fixing section 9, and a sheet discharging section 11. Composed of and.
【0009】給紙装置1は、図1に示すように、記録紙
Pを截置するホッパプレート(截置板)13と、ホッパ
プレート13を図の下側から上側へ付勢するリストアッ
プスプリング15と、ホッパプレート13の上側に記録
紙と当接するように配置されたピックローラ(給紙ロー
ラ)17とから構成される。ピックローラ17は、楕円
筒形状であって軸19を中心に回転して、その回転によ
って記録紙Pのうち最上の紙が図の矢印で示す方向に送
り出される。
As shown in FIG. 1, the sheet feeding device 1 includes a hopper plate (placement plate) 13 for placing the recording paper P and a wrist-up spring for urging the hopper plate 13 from the lower side to the upper side of the drawing. 15 and a pick roller (paper feed roller) 17 arranged above the hopper plate 13 so as to contact the recording paper. The pick roller 17 has an elliptic cylindrical shape and rotates about an axis 19, and the rotation causes the uppermost paper of the recording paper P to be fed in the direction shown by the arrow in the figure.
【0010】次に動作を説明すると、ピックローラ17
の回転により上述のとおり記録紙Pが送られるが、ロー
ラ17は断面楕円形状のため回転中心から周縁部までの
距離が一定でない。またホッパプレート13は常時下か
らスプリング15により上方に押されており、ローラ1
7の楕円の長軸が記録紙Pに対して垂直になったときに
ホッパプレート13は押し下げられ、楕円の長軸が記録
紙Pと平行になったときに元に戻るというように、ホッ
パプレート13は上下方向に揺動を繰り返す。
Next, the operation will be described. Pick roller 17
Although the recording paper P is fed by the rotation of the roller 17 as described above, the distance from the center of rotation to the peripheral portion is not constant because the roller 17 has an elliptical cross section. The hopper plate 13 is constantly pushed upward from below by a spring 15, and
The hopper plate 13 is pushed down when the major axis of the ellipse 7 is perpendicular to the recording paper P, and returns when the major axis of the ellipse 7 is parallel to the recording paper P. 13 repeatedly swings up and down.
【0011】以上のようにすれば、ローラ17の回転の
たびにプレート13が揺動するので、摩擦などによって
引っ掛かることなく記録紙Pとピックローラ17との圧
接力が減少することはない。また、ピックローラ17を
楕円筒形状にしてあるため、ローラの1回転につきホッ
パプレート13を2回上下動させるのでホッパプレート
13を効率良く揺動させることができる。
With the above arrangement, since the plate 13 swings each time the roller 17 rotates, the pressure contact force between the recording paper P and the pick roller 17 does not decrease without being caught by friction or the like. Further, since the pick roller 17 has an elliptic cylindrical shape, the hopper plate 13 is moved up and down twice for each rotation of the roller, so that the hopper plate 13 can be efficiently swung.
【0012】図3は本発明の別の実施例を示し、この例
では、給紙ローラとして円筒形状ローラ21を使用し、
回転軸23が偏心しているものを用いた。図3において
他の構成は図1と同じである。
FIG. 3 shows another embodiment of the present invention. In this example, a cylindrical roller 21 is used as a paper feeding roller,
The rotating shaft 23 used was eccentric. Other configurations in FIG. 3 are the same as those in FIG.
【0013】偏心ピックローラ21の回転に伴い軸23
とホッパプレート13との距離が変化し、ホッパプレー
ト13が上下動するので、プレート13が摩擦などで引
っ掛かることなく記録紙Pとピックローラ17との圧接
力が低下することはない。さらに偏心ピックローラ21
を使用すれば製造コストを安価にできるという利点があ
る。
As the eccentric pick roller 21 rotates, the shaft 23
Since the distance between the hopper plate 13 and the hopper plate 13 changes and the hopper plate 13 moves up and down, the plate 13 is not caught by friction and the pressure contact force between the recording paper P and the pick roller 17 does not decrease. Eccentric pick roller 21
Is advantageous in that the manufacturing cost can be reduced.
【0014】上記実施例においては、給紙ローラとし
て、楕円筒形状ローラや偏心ピックローラを利用した
が、本発明はそれに限定されず、要するにその回転中心
から周縁部までの距離が一定でなければ他のローラを使
用してもよい。
In the above embodiment, an elliptic cylindrical roller or an eccentric pick roller was used as the paper feeding roller, but the present invention is not limited to this, and in short, if the distance from the center of rotation to the peripheral portion is constant. Other rollers may be used.
【0015】[0015]
【発明の効果】以上説明したように、本発明によれば、
給紙ローラが回転するたびに截置板が揺動するので、截
置板の摩擦等による引っ掛かりをなくしてピックミスを
防止することができる。
As described above, according to the present invention,
Since the placement plate swings each time the paper feed roller rotates, it is possible to prevent catching due to friction or the like of the placement plate and prevent picking mistakes.
【図面の簡単な説明】[Brief description of drawings]
【図1】本発明による給紙装置の一実施例の概略図であ
る。
FIG. 1 is a schematic view of an embodiment of a sheet feeding device according to the present invention.
【図2】図1の給紙装置を組み込んだ画像形成装置の概
略図である。
FIG. 2 is a schematic diagram of an image forming apparatus incorporating the paper feeding device of FIG.
【図3】本発明の別の実施例を示す概略図である。FIG. 3 is a schematic view showing another embodiment of the present invention.
【符号の説明】[Explanation of symbols]
1 給紙装置 3 搬送路 5 感光部 7 転写部 9 定着部 11 排紙部 13 ホッパプレート 15 リフトアップスプリング 17 ピックローラ 19,23 軸 21 偏心ピックローラ 1 Paper Feeding Device 3 Conveying Path 5 Photosensitive Part 7 Transfer Part 9 Fixing Part 11 Paper Ejection Part 13 Hopper Plate 15 Lift-up Spring 17 Pick Roller 19, 23 Shaft 21 Eccentric Pick Roller

Claims (3)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 記録紙を截置する截置板と、前記截置板
    を記録紙の截置されない側から記録紙の截置される側へ
    押圧する押圧手段と、前記截置板の記録紙の截置される
    側に記録紙と当接するように配置された給紙ローラとを
    備え、前記給紙ローラは、その回転中心から周縁までの
    距離が一定でないことを特徴とする給紙装置。
    1. A placement plate for placing a recording sheet, a pressing means for pushing the placement plate from a side where the recording sheet is not placed to a side where the recording sheet is placed, and a recording of the placement plate. A sheet feeding roller arranged on the side where the sheet is placed so as to come into contact with the recording sheet, wherein the sheet feeding roller has a non-uniform distance from the center of rotation to the peripheral edge. .
  2. 【請求項2】 前記給紙ローラが楕円筒形状である請求
    項1の給紙装置。
    2. The paper feeding device according to claim 1, wherein the paper feeding roller has an elliptic cylindrical shape.
  3. 【請求項3】 前記給紙ローラが円筒形状であってその
    回転中心が偏心している請求項1の給紙装置。
    3. The paper feeding device according to claim 1, wherein the paper feeding roller is cylindrical and the center of rotation thereof is eccentric.
JP25623894A 1994-09-26 1994-09-26 Paper sheet feed device Pending JPH0891598A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25623894A JPH0891598A (en) 1994-09-26 1994-09-26 Paper sheet feed device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25623894A JPH0891598A (en) 1994-09-26 1994-09-26 Paper sheet feed device

Publications (1)

Publication Number Publication Date
JPH0891598A true JPH0891598A (en) 1996-04-09

Family

ID=17289860

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25623894A Pending JPH0891598A (en) 1994-09-26 1994-09-26 Paper sheet feed device

Country Status (1)

Country Link
JP (1) JPH0891598A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7410160B2 (en) 2004-09-06 2008-08-12 Samsung Electronics Co., Ltd. Pick-up unit and an image forming apparatus having the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60213640A (en) * 1984-04-04 1985-10-25 Mitsubishi Electric Corp Automatic paper feed conveyor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60213640A (en) * 1984-04-04 1985-10-25 Mitsubishi Electric Corp Automatic paper feed conveyor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7410160B2 (en) 2004-09-06 2008-08-12 Samsung Electronics Co., Ltd. Pick-up unit and an image forming apparatus having the same

Similar Documents

Publication Publication Date Title
JP3962605B2 (en) Sheet processing apparatus and image forming apparatus
US5253854A (en) Sheet feeding apparatus
US4437656A (en) Sheet feeding device
US20140239578A1 (en) Sheet discharging device and image forming apparatus incorporating same
US4928951A (en) Automatic paper feed device
US5104113A (en) Sheet material separating device having a pivotable separating member
JPH0632439U (en) Paper feeder
JP4265763B2 (en) Sheet aligner
JP2003292184A (en) Sheet material feeding device and image forming device
JPH0891598A (en) Paper sheet feed device
JP3810864B2 (en) Paper feeder
JP3940532B2 (en) Paper feeding device and image forming apparatus comprising the same
JPH0891612A (en) Paper sheet feeder
JP2000007161A (en) Sheet feed tray
JP2006044830A (en) Paper feeding device
KR200362498Y1 (en) Apparatus for arranging rear part of paper
JPH0524664A (en) Paper feeding device of image forming device
KR930002015B1 (en) Automatic paper supply apparatus
JP3428679B2 (en) Automatic document feeder
JPH1129228A (en) Sheet feeding device and image processing device
KR20060001689A (en) Apparatus for arranging rear part of paper
JPH062988Y2 (en) Paper guide device such as copier
JP3434948B2 (en) Paper feeder
JP2560589Y2 (en) Paper transport device
JP2000007177A (en) Sheet feeding device and image forming device provided with the same