JP3076998B2 - Paper feeder - Google Patents
Paper feederInfo
- Publication number
- JP3076998B2 JP3076998B2 JP03237920A JP23792091A JP3076998B2 JP 3076998 B2 JP3076998 B2 JP 3076998B2 JP 03237920 A JP03237920 A JP 03237920A JP 23792091 A JP23792091 A JP 23792091A JP 3076998 B2 JP3076998 B2 JP 3076998B2
- Authority
- JP
- Japan
- Prior art keywords
- paper
- recording
- recording paper
- lifting spring
- sheet
- 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
Links
Landscapes
- Sheets, Magazines, And Separation Thereof (AREA)
- Facsimiles In General (AREA)
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, and the like, and has a structure for pressing a recording paper fed to a pickup roller by a pushing force of a paper lifting spring.
【０００２】[0002]
【従来の技術】図５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. 5 is an explanatory view showing an example of a conventional paper feeder, wherein 1 is a pickup roller, 2 is a paper feed cassette,
Reference numeral 3 denotes a cassette bottom plate rotatable about a support shaft 3a, and reference numeral 4 denotes a paper lifting spring that pushes up the cassette bottom plate 3 and abuts the upper surface of the stacked recording papers P on 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 lifting spring 4, and the rotation angle θ of the cassette bottom plate 3 changes according to the number of recording papers P stacked. The change in the position L of the center of gravity of the own weight W corresponding to the number of recording papers P is a trigonometric function of the angle θ, whereas the elasticity T of the paper lifting spring 4 is
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-mentioned conventional apparatus,
Depending on the number of stacked sheets of recording paper P, a difference occurs in the paper feed pressure applied to the pickup roller 1. Also, the elasticity T
Cannot be dealt with because of a constant, and a difference occurs 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。SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet feeder capable of stably feeding a sheet while maintaining a constant conveying force of a pickup roller without being affected by the number or size of recording sheets.
【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、本発明は、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
当接して給紙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、給紙カセットに収納された記
録紙のサイズに応じて前記操作部によって前記紙上げス
プリングの押上げ力を変化可能にし、さらに記録紙を上
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、他端部が前記紙上
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
化に対応して変化して、前記ピックアップコロに対して
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。In order to achieve the above-mentioned object, the present invention provides a paper-lifting spring for pushing up a recording paper stacked in a paper feed cassette, and a paper-lifting spring which comes into contact with an upper surface of the recording paper. In a paper feeder provided with a pickup roller for feeding paper, an operation unit for pulling a paper lifting spring is provided in the paper feed cassette, and the operation unit is operated by the operation unit according to the size of recording paper stored in the paper feed cassette. An arm for changing the push-up force of the paper-lifting spring and further raising the recording paper; a lever provided coaxially with the arm and raised by the force of the paper-lifting spring; A wire having the other end connected to the paper-lifting spring, and a pulley for supporting the wire, wherein the angle between the wire and the lever when the number of recording sheets is arbitrary. There vary in response to changes in the self-weight and the center of gravity of the recording paper, always in the position given a constant sheet feeding pressure to the pick-up roller, characterized in that installed fulcrum of said pulley.
【０００７】[0007]
【作用】本発明によれば、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させるこ
とができるので、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り、また給紙カセットを
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可能になり、さら
に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 present invention, the pushing force of the paper lifting spring against the recording paper can be changed according to the size of the recording paper, so that a constant pressing force is applied to the pickup roller without being affected by the change in the size. In addition, if the paper feed cassette is mounted on the main body of the apparatus, the operating unit pulls the paper lifting spring, so that the lifting force of the paper lifting spring against the recording paper can be appropriately changed, and the recording paper can be further changed. Even when the number of sheets changes, the force applied to each section is balanced in accordance with the change in the position of the center of gravity of the recording paper and its own weight, so that a constant paper feeding pressure is applied.
【０００８】[0008]
【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５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 the members described with reference to FIG. 5 are denoted by the same reference numerals.
【０００９】図１は本発明の一実施例の概略構成図、図
２は本実施例の給紙カセットの一部を断面した斜視図、
図３は本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、
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. 1 is a schematic structural view of one embodiment of the present invention, FIG. 2 is a perspective view of a part of a sheet cassette of the present embodiment,
FIG. 3 is a perspective view of a main part of the present embodiment.
A hanging piece 21 at the lower right of the side fence 20 provided inside
An arm 23 having one end fixed to the rotating shaft 22 and pushing up the cassette bottom plate 3 at the other end;
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 one end rotatably supported by a shaft 26, and a pin 27 provided at the other end is a paper lifting spring 28. An operating rod 30 which is an operating part connected to the other end of the wire 24 via
And is installed.
【００１０】ワイヤ24はプーリ29によって支持され、ま
た作動杆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30c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 operating pins 30a to 30c arranged on the right side of the operating rod 30 as the recording paper becomes smaller in size. In this embodiment, the operating pin 30a is for B4 size,
The operating pin 30b is for A4 size, and the operating pin 30c is for B5 size. A total of three pins are provided.
【００１１】本実施例において、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 this embodiment, the paper feed cassette 2 is inserted into the apparatus main body by being inserted horizontally, and at this time, the hanging piece 21 of the side fence 20 is connected to the operating pin of the operating rod 30 as described later. The operating rod 30 is rotated about the shaft 26 via the operating pins 30a to 30c by contacting any one of the operating pins 30a to 30c. When the paper cassette 2 is mounted at a predetermined position, the operating lever
Since the pin 27 of the puller 30 pulls the paper raising spring 28 and the wire 24 at the same time, the lever 25 rotates upward and the arm 23 rotates upward via the rotation shaft 22.
【００１２】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-up force of the paper-lifting spring 28, and with a predetermined force, 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.
【００１３】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30
a〜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。Since the mounting position of the side fence 20 of the paper feed cassette 2 differs depending on the size of the recording paper to be stored, the operating pin 30 of the operating rod 30 corresponds to the mounting position.
By installing a to 30c as described above, the paper cassette 2
Since the amount of rotation of the operating rod 30 can be changed at the time of mounting, the tension can be changed by changing the amount of displacement of the paper lifting spring.
【００１４】したがって、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。Accordingly, the tension of the paper lifting spring 28, that is, the pushing force on the recording paper P can be changed in accordance with the weight of the recording paper, which varies depending on the size.
【００１５】紙上げスプリング28が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Ｔ
２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４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。したがって、記録紙Ｐ
の枚数の変化に対して給紙圧Ｆ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の三角関数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 lifting spring 28 is in a tension state, the weight W of the recording paper P and the rising pressure T
The moment about the support shaft 3a of the cassette bottom plate 3 with the pressure 2 (feed pressure) F applied to the pickup roller 1 is 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 is a trigonometric function of the rotation angle θ of the cassette bottom plate 3, and the rising pressure T2 is the tension T1 of the paper lifting spring 28 in FIG. Vertical component T1 × -cos α (90 °
≤ α ≤ 180 °) is balanced by the moment around the rotation axis 22,
Further, since the angle α is a function of the rotation angle θ, the rising pressure T2 is a trigonometric function of θ. Therefore, the recording paper P
In order to make the paper feed pressure F constant with respect to the change in the number of sheets, the change in the center of gravity of the recording paper P and the change in the rising pressure T2 are each a trigonometric function of the rotation angle θ, and Is set to a position where the above change is canceled.
【００１６】[0016]
【発明の効果】以上説明したように、本発明によれば、
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、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可能
になり、また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 present invention,
The lifting force of the paper-lifting spring against the recording paper can be changed according to the size of the recording paper, so that a constant pressure is applied to the pickup roller without being affected by the change in the size, and good paper feeding can be performed. Further, when the paper feed cassette is mounted on the apparatus main body, the operating unit pulls the paper raising spring, so that the lifting force of the paper raising spring against the recording paper can be easily and appropriately changed. Even when the number of sheets of recording paper changes, the force applied to each part is balanced in response to the change in the center of gravity of the recording paper and its own weight. Therefore, it is possible to provide a paper feeder that can stably feed paper while keeping the conveyance force of the pickup roller constant without being affected by the number or size of recording paper.
【図１】本発明の一実施例の概略構成図である。FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.
【図２】本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. 2 is a perspective view in which a part of the sheet cassette of the present embodiment is sectioned.
【図３】本実施例の要部の斜視図である。FIG. 3 is a perspective view of a main part of the embodiment.
【図４】本実施例における力の関係の説明図である。FIG. 4 is an explanatory diagram of a force relationship in the present embodiment.
【図５】従来の給紙装置の一例を示す説明図である。FIG. 5 is an explanatory diagram illustrating an example of a conventional sheet 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、 20…サイドフェンス、 21…垂下片、
23…アーム、 24…ワイヤ、 25…レバー、 28…紙上
げスプリング、 29…プーリ、 30…作動杆(操作部)、
30a〜30c…作動ピン。1: Pickup roller, 2: Paper cassette, 3: Cassette bottom plate, 20: Side fence, 21: Hanging piece,
23 ... arm, 24 ... wire, 25 ... lever, 28 ... paper lifting spring, 29 ... pulley, 30 ... operating rod (operation part),
30a ~ 30c… Operation pin.
Claims (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
当接して給紙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、給紙カセットに収納された記
録紙のサイズに応じて前記操作部によって前記紙上げス
プリングの押上げ力を変化可能にし、さらに記録紙を上
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、他端部が前記紙上
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
化に対応して変化して、前記ピックアップコロに対して
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給紙装置。1. A sheet feeding device comprising: a sheet lifting spring for pushing up recording sheets stacked in a sheet feeding cassette; and a pick-up roller for feeding a sheet by contacting an upper surface of the recording sheet. Pull the paper lifting spring into the paper cassette.
An operation unit for tensioning the paper
The paper raising slot is operated by the operation unit according to the size of the recording paper.
The pull-up force can be changed and the recording paper
An arm for raising, and provided coaxially with this arm
Lever raised by the force of the paper lifting spring
And this lever is provided with one end and the other end on the paper.
Wire connected to the spring and supports this wire
And a pulley for changing the number of sheets of recording paper.
The angle between the ear and the lever varies between the center of gravity of the recording paper and its own weight.
Change in response to the
Set the pulley support to a position where a constant feeding pressure is always applied.
A paper feeding device characterized by setting dots .
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 JPH0577946A (en) | 1993-03-30 |
| JP3076998B2 true 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) |
Families Citing this family (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
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0577946A (en) | 1993-03-30 |
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