JPH0577946A - Paper feeder - Google Patents
Paper feederInfo
- Publication number
- JPH0577946A JPH0577946A JP3237920A JP23792091A JPH0577946A JP H0577946 A JPH0577946 A JP H0577946A JP 3237920 A JP3237920 A JP 3237920A JP 23792091 A JP23792091 A JP 23792091A JP H0577946 A JPH0577946 A JP H0577946A
- Authority
- JP
- Japan
- Prior art keywords
- paper
- recording paper
- recording
- force
- pickup 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.)
- Granted
Links
Landscapes
- Sheets, Magazines, And Separation Thereof (AREA)
- Facsimiles In General (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、複写機，ファクシミリ
等に適用される、紙上げスプリングの押上げ力によって
ピックアップコロに給紙される記録紙を押圧させる構成
の給紙装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding apparatus which is applied to a copying machine, a facsimile or the like, and which presses a recording paper fed to a pickup roller by a pushing force of a paper raising spring.
【０００２】[0002]
【従来の技術】図８は従来の給紙装置の一例を示す説明
図であり、１はピックアップコロ、２は給紙カセット、
３は支軸３aを中心に回転可能なカセット底板、４はカ
セット底板３を押上げて積載された記録紙Ｐの上面をピ
ックアップコロ１に当接させる紙上げスプリングであ
る。2. Description of the Related Art FIG. 8 is an explanatory view showing an example of a conventional sheet feeding device, 1 is a pickup roller, 2 is a sheet feeding cassette,
Reference numeral 3 is a cassette bottom plate rotatable about a support shaft 3a, and 4 is a paper lifting spring that pushes up the cassette bottom plate 3 to bring the upper surface of the stacked recording paper P into contact with the pickup roller 1.
【０００３】前記記録紙Ｐは、紙上げスプリング４の力
を受けるカセット底板３の支軸３aを中心に回動し、カ
セット底板３の回動角度θは記録紙Ｐの積載枚数によっ
て変化する。そして記録紙Ｐの枚数に対応する自重Ｗの
重心の位置Ｌの変化は、前記角度θの三角関数であるの
に対して、紙上げスプリング４の弾発力Ｔは、記録紙Ｐ
の枚数に略正比例する。The recording paper P rotates about a support shaft 3a of the cassette bottom plate 3 which receives the force of the paper raising spring 4, and the rotation angle θ of the cassette bottom plate 3 changes depending on the number of stacked recording papers P. The change in the position L of the center of gravity of the own weight W corresponding to the number of recording sheets P is a trigonometric function of the angle θ, whereas the elastic force T of the paper raising spring 4 is equal to the recording sheet P.
Is approximately directly proportional to the number of sheets.
【０００４】[0004]
【発明が解決しようとする課題】上記の従来装置では、
記録紙Ｐの積載枚数の多少によって、ピックアップコロ
１に加わる給紙圧に差がでてくることになる。また記録
紙Ｐのサイズによる自重Ｗの変化に対しても、弾発力Ｔ
が一定であるため対応できず、給紙圧に差が生じる。前
記給紙圧の変化は、記録紙Ｐに対する分離、搬送を不安
定にすることになる。In the above conventional device,
The feeding pressure applied to the pickup roller 1 varies depending on the number of stacked recording sheets P. Further, even if the weight W of the recording paper P changes, the elastic force T
Cannot be dealt with because the value is constant, resulting in a difference in the sheet feeding pressure. The change in the paper feed pressure makes the separation and conveyance of the recording paper P unstable.
【０００５】本発明の目的は、記録紙の枚数やサイズに
影響されずにピックアップコロの搬送力を一定に保持し
て、安定した給紙が行われる給紙装置を提供することに
ある。It is an object of the present invention to provide a paper feeding device which can stably feed paper by keeping the conveying force of the pickup roller constant regardless of the number and size of recording papers.
【０００６】[0006]
【課題を解決するための手段】上記の目的を達成するた
め、給紙カセット内に積載された記録紙を押上げるため
の紙上げスプリングと、前記記録紙の上面に当接して搬
送を行うピックアップコロとを備えた給紙装置におい
て、本発明の第１の手段は、前記ピックアップコロをト
ルクリミッタを介して前記記録紙の上面に対して下降か
つ加圧可能にし、さらにピックアップコロの搬送方向の
上流側に、記録紙の上面と当接して、記録紙の上面を一
定高さに保持するストッパコロを設け、前記ピックアッ
プコロが記録紙の上面を加圧する力を、前記紙上げスプ
リングがストッパコロに対して記録紙を押上げる力より
も大きく設定したことを特徴とする。In order to achieve the above object, a paper raising spring for pushing up a recording paper loaded in a paper feed cassette, and a pickup for carrying the recording paper by contacting the upper surface of the recording paper. In a paper feeding device provided with a roller, the first means of the present invention makes it possible to lower and press the pickup roller against the upper surface of the recording paper via a torque limiter, and further, in the conveying direction of the pickup roller. On the upstream side, a stopper roller that contacts the upper surface of the recording paper and holds the upper surface of the recording paper at a constant height is provided, and the force to press the upper surface of the recording paper by the pickup roller is applied to the stopper roller with respect to the stopper roller. It is characterized in that it is set to be larger than the force of pushing up the recording paper.
【０００７】また第２の手段は、上記の第１の手段にお
いて、ピックアップコロが記録紙の上面を加圧する力
を、前記ストッパコロの給紙時の連れ回り負荷より、ピ
ックアップコロの搬送力の方が大きくなるように設定し
たことを特徴とする。The second means is the above-mentioned first means, in which the force of the pickup roller pressing the upper surface of the recording paper is more equal to the conveying force of the pickup roller than the accompanying load of the stopper roller during feeding. Is set to be large.
【０００８】さらに第３の手段は、上記の給紙装置にお
いて、給紙カセットに記録紙のサイズに応じて紙上げス
プリングの押上げ力を変化させる手段を設けたことを特
徴とする。A third means is characterized in that, in the above-mentioned paper feeding apparatus, the paper feeding cassette is provided with means for changing the pushing force of the paper raising spring according to the size of the recording paper.
【０００９】また第４の手段は、上記の第３の手段にお
いて、給紙カセットに前記紙上げスプリングを引張るた
めの操作部を設け、給紙カセットの装置本体への挿入量
に応じて前記操作部によって前記紙上げスプリングを引
張るように構成したことを特徴とする。A fourth means is the same as the above-mentioned third means, wherein the paper feed cassette is provided with an operation portion for pulling the paper raising spring, and the operation is performed in accordance with the insertion amount of the paper feed cassette into the apparatus main body. It is characterized in that the paper raising spring is pulled by a portion.
【００１０】また第５の手段は、上記の第４の手段にお
いて、記録紙を上昇させるためのアームと、このアーム
と同軸に設けられて前記紙上げスプリングの力を受けて
上昇するレバーと、このレバーに一端部が設けられ、他
端部が紙上げスプリングに連結されたワイヤと、このワ
イヤを支持するプーリとを備え、記録紙が任意の枚数の
時の前記ワイヤとレバーとの角度が、記録紙の重心位置
と自重との変化に対応して常に一定の給紙圧が与えられ
る位置に、前記プーリの支点を設置したことを特徴とす
る。The fifth means is, in the above-mentioned fourth means, an arm for raising the recording paper, and a lever provided coaxially with the arm and being raised by receiving the force of the paper raising spring. The lever is provided with one end, and the other end is provided with a wire connected to a paper-pulling spring and a pulley for supporting the wire, and the angle between the wire and the lever when the number of recording sheets is arbitrary. The fulcrum of the pulley is installed at a position where a constant feeding pressure is always applied in correspondence with the change of the center of gravity of the recording paper and its own weight.
【００１１】[0011]
【作用】上記の第１，第２の手段によれば、記録紙の上
面はピックアップコロでなくストッパコロに当接して位
置規制され、ピックアップコロがトルクリミッタの動作
を受けて記録紙に対する一定の加圧力(給紙圧)を加える
ことになる。またストッパコロにおいて記録紙上面に対
して加わる力よりもピックアップコロの加圧力の方が大
きくなるので、記録紙の搬送に影響を与えない。According to the above-mentioned first and second means, the upper surface of the recording paper is brought into contact with not the pickup roller but the stopper roller to regulate the position of the recording paper. Pressure (paper feed pressure) will be applied. In addition, since the pressing force of the pickup roller is larger than the force applied to the upper surface of the recording paper at the stopper roller, it does not affect the conveyance of the recording paper.
【００１２】また第３の手段によれば、記録紙のサイズ
に応じて紙上げスプリングの記録紙に対する押上げ力を
変化できるので、サイズの変化に影響されずに一定の加
圧力がピックアップコロに加わることになる。According to the third means, since the pushing force of the paper raising spring with respect to the recording paper can be changed according to the size of the recording paper, a constant pressing force is applied to the pickup roller without being affected by the change in size. Will join.
【００１３】また第４の手段によれば、給紙カセットを
装置本体に装着すれば、操作部が前記紙上げスプリング
を引張ることにより、紙上げスプリングの記録紙に対す
る押上げ力を適切に変化させることができる。According to the fourth means, when the paper feed cassette is mounted on the main body of the apparatus, the operating portion pulls the paper raising spring, thereby appropriately changing the pushing force of the paper raising spring with respect to the recording paper. be able to.
【００１４】また第５の手段によれば、記録紙の枚数が
変化しても、記録紙の重心位置と自重との変化に対応し
て各部に加わる力のつり合が図られるため、一定の給紙
圧が与えられることになる。According to the fifth means, even if the number of recording sheets changes, the forces applied to the respective parts are balanced in accordance with the change in the center of gravity of the recording sheets and the self-weight, so that the force is constant. Feeding pressure will be applied.
【００１５】[0015]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。尚、図８に基づいて説明した部材と対応する部材
には同一符号を付した。Embodiments of the present invention will be described below with reference to the drawings. The members corresponding to those described with reference to FIG. 8 are designated by the same reference numerals.
【００１６】図１は本発明の第１実施例の正面における
構成の説明図、図２は第１実施例の要部の平面図であ
り、ピックアップコロ１はブラケット10に設けられてお
り、このブラケット10は、フィードコロ11と分離コロ12
とからなる分離搬送コロ対におけるフィードコロ11のフ
ィード軸13に支持されて上下動可能であり、さらにフィ
ード軸13に設けられたトルクリミッタ14の動作を受ける
ようになっている。またピックアップコロ１の搬送方向
の上流側には、ストッパコロ15が固定されている。FIG. 1 is an explanatory view of the front structure of the first embodiment of the present invention, and FIG. 2 is a plan view of the essential parts of the first embodiment. A pickup roller 1 is provided on a bracket 10. The bracket 10 includes a feed roller 11 and a separation roller 12.
The pair of separating and conveying rollers composed of and are supported by a feed shaft 13 of a feed roller 11 and can move up and down, and are further subjected to an operation of a torque limiter 14 provided on the feed shaft 13. A stopper roller 15 is fixed on the upstream side of the pickup roller 1 in the transport direction.
【００１７】上記の第１実施例において、記録紙Ｐは、
紙上げスプリング４の押上げ力を受けたカセット底板３
により、まず上面がピックアップコロ１でなくストッパ
コロ15に当接することになり、一方、ピックアップコロ
１は、フィード軸13を中心として上下動し、フィード軸
13の回転時には回転方向にトルクリミッタ14の作用を受
けて下降して記録紙Ｐの上面に当接する。この当接時、
ピックアップコロ１は、トルクリミッタ14がフィード軸
13に対して空転状態となるので、一定のトルクが加わ
り、記録紙Ｐに対する加圧力Ｆ１を発生する。In the first embodiment described above, the recording paper P is
Cassette bottom plate 3 that receives the lifting force of paper lifting spring 4
As a result, the upper surface first comes into contact with the stopper roller 15 instead of the pickup roller 1, while the pickup roller 1 moves up and down about the feed shaft 13,
When 13 rotates, it is lowered by the action of the torque limiter 14 in the rotation direction and comes into contact with the upper surface of the recording paper P. At the time of this contact,
In the pickup roller 1, the torque limiter 14 is the feed shaft.
Since 13 is in the idling state, a constant torque is applied and a pressing force F1 is applied to the recording paper P.
【００１８】そしてピックアップコロ１の加圧力Ｆ１
を、ストッパコロ15に加わる記録紙Ｐの押圧力(紙上げ
スプリング４がストッパコロ15に対して記録紙Ｐを押上
げる力)Ｆ２より大きく設定してある。このことによ
り、ピックアップコロ１による記録紙搬送時には、スト
ッパコロ15が記録紙Ｐの上面に対して外れることにな
り、ピックアップコロ１は、一定の加圧力が得られ、ス
トッパコロ15の影響を受けない。またピックアップコロ
１による記録紙搬送時に、ストッパコロ15が記録紙Ｐの
上面から完全に離れないで、記録紙Ｐに対する押圧を残
している場合には、ピックアップコロ１の搬送力(＝μ1
×Ｆ１，μ1は記録紙Ｐとピックアップローラ１間の摩
擦係数)が、記録紙Ｐの押圧によるストッパコロ15の連
れ回り負荷(＝γ／Ｒ×μ2×Ｆ２，γはストッパコロ15
の内径，Ｒはストッパコロ15の外径、μ2はストッパコ
ロ15とストッパコロ軸15a間の摩擦係数)より大きくする
ことで、記録紙Ｐの不送りは発生しない。The pressing force F1 of the pickup roller 1
Is set to be larger than the pressing force of the recording paper P applied to the stopper roller 15 (the force by which the paper lifting spring 4 pushes up the recording paper P against the stopper roller 15) F2. As a result, when the recording paper is conveyed by the pickup roller 1, the stopper roller 15 is disengaged from the upper surface of the recording paper P, so that the pickup roller 1 is given a constant pressing force and is not affected by the stopper roller 15. Further, when the recording roller P is conveyed by the pickup roller 1, the stopper roller 15 is not completely separated from the upper surface of the recording sheet P and the pressing force against the recording sheet P is left, the conveying force of the pickup roller 1 (= μ 1
× F1, μ 1 is the friction coefficient between the recording paper P and the pickup roller 1, and the accompanying load of the stopper roller 15 due to the pressing of the recording paper P (= γ / R × μ 2 × F2, γ is the stopper roller 15).
The inner diameter, R is the outer diameter of the stopper roller 15, and μ 2 is larger than the friction coefficient between the stopper roller 15 and the stopper roller shaft 15a), so that the recording paper P is not fed.
【００１９】尚、上記の第１実施例では、ストッパコロ
15をピックアップコロ１に対して上流側に設置してお
り、このことにより、記録紙Ｐの上面とストッパコロ15
とが接触してピックアップコロ１に対する負荷になって
も、負荷が一直線に働く(記録紙に対するモーメントが
発生しない)ためスキューの発生を抑制できる。In the first embodiment, the stopper roller is used.
15 is installed on the upstream side with respect to the pickup roller 1, so that the upper surface of the recording paper P and the stopper roller 15 are provided.
Even if the and contacts come into contact with each other and become a load on the pickup roller 1, the load acts in a straight line (a moment with respect to the recording paper does not occur), so that the occurrence of skew can be suppressed.
【００２０】しかし前記ストッパコロ15を、図３の第１
実施例の変形例を示す平面図のように、ピックアップコ
ロ１の軸線方向の両側に設置してもよい。この場合でも
搬送位置が搬送方向に対して対称になるため、搬送のバ
ランスがとれてスキューの発生を抑制できる。However, the stopper roller 15 is replaced with the first one in FIG.
As in a plan view showing a modified example of the embodiment, it may be installed on both sides of the pickup roller 1 in the axial direction. Even in this case, since the transport position is symmetrical with respect to the transport direction, the transport can be balanced and the occurrence of skew can be suppressed.
【００２１】図４は本発明の第２実施例の概略構成図、
図５は第２実施例の給紙カセットの一部を断面した斜視
図、図６は第２実施例の要部の斜視図であり、給紙カセ
ット２内に設けられたサイドフェンス20の右側下部に垂
下片21を設け、また装置本体側には、回動軸22に一端が
固定され、かつ他端でカセット底板３を押上げるアーム
23と、前記回動軸22に一端が固定され、かつ他端にワイ
ヤ24の一端が連結されたレバー25と、一端が回動可能に
軸26で支承され、他端に設けたピン27が紙上げスプリン
グ28を介して前記ワイヤ24の他端と連結している操作部
である作動杆30とが設置されている。FIG. 4 is a schematic configuration diagram of a second embodiment of the present invention,
FIG. 5 is a perspective view in which a part of the paper feed cassette of the second embodiment is shown in section, and FIG. 6 is a perspective view of the essential parts of the second embodiment. The right side of the side fence 20 provided in the paper feed cassette 2. An arm provided with a hanging piece 21 at the lower part, and having one end fixed to a rotary shaft 22 and pushing up the cassette bottom plate 3 at the other end on the apparatus body side.
23, a lever 25 having one end fixed to the rotating shaft 22 and one end of a wire 24 connected to the other end, and a pin 27 rotatably supported at one end by a shaft 26 and provided at the other end. An operating rod 30 which is an operating portion connected to the other end of the wire 24 via a paper-lifting spring 28 is installed.
【００２２】前記ワイヤ24はプーリ29によって支持さ
れ、また前記作動杆30上には、記録紙が小サイズになる
に従い、右方側に配された複数の作動ピン30a〜30cが立
設されている。本実施例では、作動ピン30aがＢ４サイ
ズ対応用、作動ピン30bがＡ４サイズ対応用、作動ピン3
0cがＢ５サイズ対応用であって、計３個が設けられてい
る。The wire 24 is supported by a pulley 29, and a plurality of actuating pins 30a to 30c arranged on the right side are erected on the actuating rod 30 as the recording paper becomes smaller. There is. In this embodiment, the operation pin 30a is for B4 size, the operation pin 30b is for A4 size, and the operation pin 3
0c is for B5 size, and a total of three are provided.
【００２３】上記の第２実施例において、給紙カセット
２を装置本体に対して水平に挿入させて装着させるが、
この挿入時、サイドフェンス20の垂下片21が、後述する
ように作動杆30の作動ピン30a〜30cのいずれかと当接し
て、作動ピン30a〜30cを介して作動杆30を軸26を中心に
回動させる。給紙カセット２が所定位置に装着される
と、作動杆30のピン27は、紙上げスプリング28を引張
り、同時にワイヤ24を引張ることから、レバー25が上方
へ回動し、回動軸22を介してアーム23を上方へ回動させ
ることになる。In the second embodiment described above, the paper feed cassette 2 is inserted horizontally into the main body of the apparatus and mounted.
At the time of this insertion, the hanging piece 21 of the side fence 20 comes into contact with one of the operating pins 30a to 30c of the operating rod 30 as described later, and the operating rod 30 is centered around the shaft 26 via the operating pins 30a to 30c. Rotate. When the paper feed cassette 2 is mounted at a predetermined position, the pin 27 of the operating rod 30 pulls the paper lifting spring 28 and at the same time pulls the wire 24, so that the lever 25 rotates upward and the rotary shaft 22 moves. The arm 23 will be rotated upwards via this.
【００２４】上記の状態で、アーム23は、紙上げスプリ
ング28の押上げ力を受けて、所定の力でカセット底板３
を支軸３aを中心に回動させ、積載された記録紙Ｐの上
面をピックアップコロ１に当接させる。In the above state, the arm 23 receives the pushing force of the paper raising spring 28 and a predetermined force is applied to the cassette bottom plate 3
Is rotated about the support shaft 3a, and the upper surface of the loaded recording paper P is brought into contact with the pickup roller 1.
【００２５】前記給紙カセット２のサイドフェンス20
は、収納される記録紙のサイズにより取付け位置が異な
るため、この取付け位置に対応させて作動杆30の作動ピ
ン30a〜30cを上記のように設置することで、給紙カセッ
ト２の装着時に作動杆30の回動量が変えられるので、紙
上げスプリング28の変位量を変化させて張力を変化させ
ることができる。The side fence 20 of the paper feed cassette 2
Since the mounting position differs depending on the size of the recording paper to be stored, the operating pins 30a to 30c of the operating rod 30 are installed as described above in accordance with the mounting position, so that the sheet feeding cassette 2 operates when mounted. Since the amount of rotation of the rod 30 can be changed, the amount of displacement of the paper raising spring 28 can be changed to change the tension.
【００２６】従って、サイズによって変わる記録紙の自
重に合せて紙上げスプリング28の張力、すなわち記録紙
Ｐに対する押上げ力を変化させることができる。Therefore, it is possible to change the tension of the paper-pulling spring 28, that is, the pushing-up force with respect to the recording paper P, in accordance with the weight of the recording paper that changes depending on the size.
【００２７】前記紙上げスプリング28の引張り状態とな
った時には、記録紙Ｐの自重Ｗと、アーム23による上昇
圧Ｔ2と、ピックアップコロ１への加圧力(給紙圧)Ｆと
のカセット底板３の支軸３a回りのモーメントがつり合
う。ここで、記録紙Ｐの自重Ｗの変化は枚数と比例し、
重心の位置はカセット底板３の回動角度θの三角関数と
なり、前記上昇圧Ｔ2は紙上げスプリング28の張力Ｔ1の
図７におけるレバー25との垂直成分Ｔ1×−cosα(90°
≦α≦180°)が回動軸22回りのモーメントでつり合い、
かつ前記角度αは前記回動角度θの関数であるため、上
昇圧Ｔ2はθの三角関数となる。従って、記録紙Ｐの枚
数の変化に対して給紙圧下を一定にするため、記録紙Ｐ
の重心の変化と上昇圧Ｔ2の変化が、それぞれ前記回動
角度θの三角関係であることを利用し、プーリ29の設置
位置を、上記の変化を打ち消し合う位置に設定する。When the paper raising spring 28 is in a tensioned state, the cassette bottom plate includes the weight W of the recording paper P, the rising pressure T 2 by the arm 23, and the pressing force (feeding pressure) F to the pickup roller 1. The moments around the spindle 3a of 3 are balanced. Here, the change in the weight W of the recording paper P is proportional to the number of sheets,
The position of the center of gravity becomes a trigonometric function of the rotation angle θ of the cassette bottom plate 3, and the rising pressure T 2 is the vertical component T 1 × −cos α (90 °) of the tension T 1 of the paper raising spring 28 with the lever 25 in FIG.
≦ α ≦ 180 °) is balanced by the moment around the rotating shaft 22,
Moreover, since the angle α is a function of the rotation angle θ, the rising pressure T 2 is a trigonometric function of θ. Therefore, in order to keep the paper feed pressure constant with respect to the change in the number of recording papers P, the recording papers P
By utilizing the fact that the change of the center of gravity of the above and the change of the rising pressure T 2 are in the triangular relation of the rotation angle θ, the installation position of the pulley 29 is set to a position where the above changes are canceled out.
【００２８】[0028]
【発明の効果】以上説明したように、本発明の第１，第
２の手段によれば、記録紙の上面はピックアップコロで
なくストッパコロに当接して位置規制され、ピックアッ
プコロがトルクリミッタの動作を受けて一定の加圧力
(給紙圧)となり、またストッパコロにおいて記録紙上面
に対して加わる力よりもピックアップコロの加圧力の方
が大きくなるので、記録紙の搬送に影響を与えず、記録
紙の積載枚数に影響されずに良好な給紙が行え、また第
３の手段によれば、記録紙のサイズに応じて紙上げスプ
リングの記録紙に対する押上げ力を変化できるので、サ
イズの変化に影響されずに一定の加圧力がピックアップ
コロに加わることになって、良好な給紙が行え、また第
４の手段によれば、給紙カセットを装置本体に装着すれ
ば、操作部が前記紙上げスプリングを引張ることによ
り、紙上げスプリングの記録紙に対する押上げ力を自動
的に容易かつ適切に変化させることができ、また第５の
手段によれば、記録紙の枚数が変化しても、記録紙の重
心位置と自重との変化に対応して各部に加わる力のつり
合が図られるため、常に一定の給紙圧が与えられること
ができるため、記録紙の枚数やサイズに影響されずにピ
ックアップコロの搬送力を一定に保持して、安定した給
紙が行われる給紙装置を提供できる。As described above, according to the first and second means of the present invention, the upper surface of the recording paper is brought into contact with the stopper roller instead of the pickup roller to regulate the position, and the pickup roller operates as the torque limiter. Receive constant pressure
(Paper feed pressure), and since the pressure applied by the pickup roller is larger than the force applied to the upper surface of the recording paper by the stopper roller, it does not affect the conveyance of the recording paper and is affected by the number of stacked recording paper. Good paper feeding can be performed without changing the size of the recording paper. Further, according to the third means, the pushing force of the paper raising spring with respect to the recording paper can be changed according to the size of the recording paper. Good pressure is applied to the pickup roller, and good paper feeding can be performed. According to the fourth means, when the paper feeding cassette is attached to the main body of the apparatus, the operation unit pulls the paper lifting spring. The pushing force of the paper lifting spring against the recording paper can be automatically and easily changed, and according to the fifth means, even if the number of recording papers changes, the position of the center of gravity of the recording papers can be changed. Change with own weight Since the force applied to each part is balanced in accordance with the above, a constant paper feed pressure can be applied at all times, so the conveyance force of the pickup roller is kept constant without being affected by the number and size of recording paper. As a result, it is possible to provide a paper feeding device that performs stable paper feeding.
【図１】本発明の第１実施例の正面図における構成の説
明図である。FIG. 1 is an explanatory diagram of a configuration of a front view of a first embodiment of the present invention.
【図２】第１実施例の要部の平面図である。FIG. 2 is a plan view of a main part of the first embodiment.
【図３】第１実施例の変形例における要部の平面図であ
る。FIG. 3 is a plan view of a main part in a modification of the first embodiment.
【図４】本発明の第２実施例の概略構成図である。FIG. 4 is a schematic configuration diagram of a second embodiment of the present invention.
【図５】第２実施例の給紙カセットの一部を断面した斜
視図である。FIG. 5 is a perspective view in which a part of the paper feed cassette of the second embodiment is sectioned.
【図６】第２実施例の要部の斜視図である。FIG. 6 is a perspective view of a main part of the second embodiment.
【図７】第２実施例における力の関係の説明図である。FIG. 7 is an explanatory diagram of a force relationship in the second embodiment.
【図８】従来の給紙装置の一例を示す説明図である。FIG. 8 is an explanatory diagram showing an example of a conventional paper feeding device.
１…ピックアップコロ、 ２…給紙カセット、 ３…カ
セット底板、 ４，28…紙上げスプリング、 14…トル
クリミッタ、 15…ストッパコロ、 21…サイドフェン
ス、 21…垂下片、 23…アーム、 24…ワイヤ、 25
…レバー、 29…プーリ、 30…作動杆(操作部)、 30
a〜30c…作動ピン。1 ... Pickup roller, 2 ... Paper feed cassette, 3 ... Cassette bottom plate, 4, 28 ... Paper lifting spring, 14 ... Torque limiter, 15 ... Stopper roller, 21 ... Side fence, 21 ... Hanging piece, 23 ... Arm, 24 ... Wire , twenty five
… Lever, 29… Pulley, 30… Operating rod (operation part), 30
a to 30c ... Actuating pin.
Claims (5)
上げるための紙上げスプリングと、前記記録紙の上面に
当接して搬送を行うピックアップコロとを備えた給紙装
置において、前記ピックアップコロをトルクリミッタを
介して前記記録紙の上面に対して下降かつ加圧可能に
し、さらにピックアップコロの搬送方向の上流側に、記
録紙の上面と当接して、記録紙の上面を一定高さに保持
するストッパコロを設け、前記ピックアップコロが記録
紙の上面を加圧する力を、前記紙上げスプリングがスト
ッパコロに対して記録紙を押上げる力よりも大きく設定
したことを特徴とする給紙装置。1. A paper feeding device comprising a paper raising spring for pushing up a recording paper loaded in a paper feeding cassette, and a pickup roller for bringing the recording paper into contact with an upper surface of the recording paper to convey the recording paper. The roller can be lowered and pressed against the upper surface of the recording paper via a torque limiter. Further, the upper surface of the recording paper is brought into contact with the upper surface of the recording paper at a constant height by contacting with the upper surface of the pickup roller in the conveying direction. A paper feed device, wherein a stopper roller for holding the recording paper is provided, and the force for the pickup roller to press the upper surface of the recording paper is set to be larger than the force for the paper lifting spring to push the recording paper against the stopper roller.
加圧する力を、前記ストッパコロの給紙時の連れ回り負
荷より、ピックアップコロの搬送力の方が大きくなるよ
うに設定したことを特徴とする請求項１の給紙装置。2. The force for pressing the upper surface of the recording paper by the pickup roller is set so that the conveying force of the pickup roller is larger than the accompanying rotation load of the stopper roller during feeding. The sheet feeding device according to claim 1.
上げるための紙上げスプリングと、前記記録紙の上面に
当接して搬送を行うピックアップコロとを備えた給紙装
置において、前記給紙カセットに記録紙のサイズに応じ
て前記紙上げスプリングの押上げ力を変化させる手段を
設けたことを特徴とする給紙装置。3. A paper feeding device provided with a paper raising spring for pushing up recording paper loaded in a paper feeding cassette, and a pickup roller for abutting on an upper surface of the recording paper for carrying. A paper feeding device, characterized in that the paper cassette is provided with means for changing the pushing force of the paper raising spring according to the size of the recording paper.
グを引張るための操作部を設け、給紙カセットの装置本
体への挿入量に応じて前記操作部によって前記紙上げス
プリングを引張るように構成したことを特徴とする請求
項３の給紙装置。4. An operation unit for pulling the paper raising spring is provided in the paper feeding cassette, and the paper raising spring is pulled by the operation unit according to an insertion amount of the paper feeding cassette into the apparatus main body. The sheet feeding device according to claim 3, wherein the sheet feeding device is a sheet feeding device.
のアームと同軸に設けられて前記紙上げスプリングの力
を受けて上昇するレバーと、このレバーに一端部が設け
られ、他端部が紙上げスプリングに連結されたワイヤ
と、このワイヤを支持するプーリとを備え、記録紙が任
意の枚数の時の前記ワイヤとレバーとの角度が、記録紙
の重心位置と自重との変化に対応して常に一定の給紙圧
が与えられる位置に、前記プーリの支点を設置したこと
を特徴とする請求項４の給紙装置。5. An arm for raising a recording sheet, a lever which is provided coaxially with the arm and which is raised by receiving a force of the sheet raising spring, and one end portion of which is provided at the other end portion of the lever. Equipped with a wire that is connected to the paper lift spring and a pulley that supports this wire, the angle between the wire and the lever when the number of recording paper sheets is arbitrary corresponds to changes in the center of gravity of the recording paper and its own weight. 5. The sheet feeding device according to claim 4, wherein the fulcrum of the pulley is installed at a position where a constant sheet feeding pressure is always applied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03237920A JP3076998B2 (en) | 1991-09-18 | 1991-09-18 | Paper feeder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03237920A JP3076998B2 (en) | 1991-09-18 | 1991-09-18 | Paper feeder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0577946A true JPH0577946A (en) | 1993-03-30 |
| JP3076998B2 JP3076998B2 (en) | 2000-08-14 |
Family
ID=17022411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03237920A Expired - Fee Related JP3076998B2 (en) | 1991-09-18 | 1991-09-18 | Paper feeder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3076998B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06247567A (en) * | 1993-02-25 | 1994-09-06 | Nec Corp | Paper sheet feed device |
| JP2008044679A (en) * | 2006-08-10 | 2008-02-28 | Seiko Epson Corp | Automatic feeder, recording device, and liquid ejection device |
| JP2008114947A (en) * | 2006-11-01 | 2008-05-22 | Seiko Epson Corp | Hopper device, recording device, and liquid jetting device |
-
1991
- 1991-09-18 JP JP03237920A patent/JP3076998B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06247567A (en) * | 1993-02-25 | 1994-09-06 | Nec Corp | Paper sheet feed device |
| JP2008044679A (en) * | 2006-08-10 | 2008-02-28 | Seiko Epson Corp | Automatic feeder, recording device, and liquid ejection device |
| JP2008114947A (en) * | 2006-11-01 | 2008-05-22 | Seiko Epson Corp | Hopper device, recording device, and liquid jetting device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3076998B2 (en) | 2000-08-14 |
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