JPH05147752A - Method and device for sheet feed in image forming device - Google Patents
Method and device for sheet feed in image forming deviceInfo
- Publication number
- JPH05147752A JPH05147752A JP3310607A JP31060791A JPH05147752A JP H05147752 A JPH05147752 A JP H05147752A JP 3310607 A JP3310607 A JP 3310607A JP 31060791 A JP31060791 A JP 31060791A JP H05147752 A JPH05147752 A JP H05147752A
- Authority
- JP
- Japan
- Prior art keywords
- paper
- feeding
- paper feeding
- roller
- laminated
- 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
Landscapes
- 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、積層紙の最上側の紙を
送り出すための給紙ロ−ラを備える画像形成装置の給紙
方法、ならびにこの給紙方法を実施するための給紙装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding method for an image forming apparatus having a sheet feeding roller for feeding the uppermost sheet of laminated paper, and a sheet feeding apparatus for carrying out this sheet feeding method. Regarding
【０００２】[0002]
【従来の技術】カット紙を用いる複写機、ファクシミ
リ、プリンタ等の画像形成装置の従来の給紙装置は、積
層紙を収納する給紙カセットと、前記積層紙の最上側の
紙を送り出すための給紙ロ−ラと、給紙カセット内の積
層紙を給紙ロ−ラに接触させるための加圧レバーと、給
紙カセットの先端部に設けた重送防止用分離爪とを備
え、前記給紙ロ−ラにより紙を給紙方向に移動させるこ
とにより最上側の紙のみを送り出していた。2. Description of the Related Art A conventional sheet feeding device for an image forming apparatus such as a copying machine, a facsimile machine or a printer, which uses cut sheets, has a sheet feeding cassette for accommodating laminated sheets and a sheet for feeding the uppermost sheet of the laminated sheets. A sheet feeding roller, a pressure lever for bringing the laminated paper in the sheet feeding cassette into contact with the sheet feeding roller, and a double feed preventing separation claw provided at the front end of the sheet feeding cassette. Only the uppermost paper was sent out by moving the paper in the paper feeding direction by the paper feeding roller.
【０００３】[0003]
【発明が解決しようとする課題】しかし、分離爪のみを
用いる前述の重送防止方法では、紙の重送は減少する
が、なくすことはできない。このため紙の重送が起こる
ことにより、紙詰まりなどの障害の生ずることが避けら
れなかった。However, in the above-described method of preventing double feeding using only the separating claw, the double feeding of paper is reduced, but cannot be eliminated. For this reason, it is unavoidable that double feeding of paper occurs and trouble such as paper jam occurs.
【０００４】本発明は、従来の給紙装置における前述の
不都合をなくし、紙の重送のない給紙方法およびこの方
法を実施するための給紙装置を提供することを課題とす
る。SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned inconvenience in a conventional paper feeding device, and to provide a paper feeding method without double feeding of paper and a paper feeding device for implementing this method.
【０００５】[0005]
【課題を解決するための手段】前記の課題は、本発明に
より、給紙ロ−ラを給紙方向の反対に回転させて紙を給
紙方向の反対に引き、ついで前記給紙ロ−ラを給紙方向
に回転させて紙を送り出す給紙方法により解決される。SUMMARY OF THE INVENTION According to the present invention, the above-mentioned problem is solved by rotating the paper feed roller in the opposite direction to the paper feed direction and pulling the paper in the opposite direction to the paper feed direction. This is solved by a paper feeding method in which the paper is rotated in the paper feeding direction to feed the paper.
【０００６】また、本発明は、前記の給紙方法を実施す
るために、給紙ロ−ラが給紙方向およびその反対方向に
回転駆動可能であり、そして給紙カセットが、その後部
に紙がたわんで曲がることのできる空間を有する給紙装
置を提案する。According to the present invention, in order to carry out the above-mentioned paper feeding method, the paper feeding roller can be rotationally driven in the paper feeding direction and the opposite direction, and the paper feeding cassette has a paper feeding device at the rear thereof. We propose a paper feeding device having a space that can be bent and bent.
【０００７】また、本発明は、前記の給紙装置におい
て、給紙カセット内の積層紙を給紙ロ−ラに接触させる
ための加圧レバーが、紙搬送時積層紙を給紙ロ−ラに接
触させるため上方に移動し、搬送終了時下方へ移動して
積層紙を給紙ロ−ラより離隔させることを提案する。Further, according to the present invention, in the above-mentioned paper feeding device, the pressure lever for bringing the laminated paper in the paper feeding cassette into contact with the paper feeding roller is a paper feeding roller for feeding the laminated paper at the time of paper conveyance. It is proposed to move the laminated paper to the upper side to bring the laminated paper into contact with the paper feeding roller and to move the laminated paper downward at the end of the conveyance.
【０００８】さらに、本発明は、前記の給紙装置におい
て、積層紙から最上側の紙のみを分離するための分離爪
が、紙搬送時に降下して紙に接触し、搬送終了時に上昇
して紙より離れることを提案する。Further, according to the present invention, in the above-mentioned paper feeding device, the separating claw for separating only the uppermost paper from the laminated paper is lowered when the paper is conveyed and comes into contact with the paper, and is raised at the end of the conveyance. Suggest to stay away from paper.
【０００９】[0009]
【作用】給紙時、給紙ロ−ラがまず給紙方向の反対に回
転して、紙を給紙方向の反対に引く。このとき、紙は給
紙カセットの後側壁により後方への移動を阻止されるの
で、後部のふくらみ部内でたわむことになる。かくたわ
んだ紙は、復元力により元に戻ろうとする。最上側の紙
は、給紙ロ−ラの力が強いので、前記復元力の作用を受
けることは殆どなく後方へ引かれ、その先端は分離爪の
手前まで移動する。これに対し、２枚目以降の紙は、最
上側の紙の移動につれて後方へ移動するにしても、前記
復元力の作用を大きく受けるので、それらの先端が分離
爪の位置まで移動することはない。この段階で、最上側
の紙と２枚目以降の紙は分離される。ついで、給紙ロ−
ラが給紙方向に回転し、最上側の紙は給紙方向に送られ
て分離爪の上に載り、プリンタ本体内部へ搬送される。
最上側の紙を送り出した後、加圧レバーを降下させると
ともに分離爪を上方へ移動させるので、残った２枚目以
降の紙は給紙ロ−ラおよび分離爪との接触より解放さ
れ、これらの紙はそのたわみが戻り元の位置へ復帰す
る。When the paper is fed, the paper feed roller first rotates in the opposite direction to the paper feed direction and pulls the paper in the opposite direction to the paper feed direction. At this time, the paper is prevented from moving rearward by the rear side wall of the paper feed cassette, so that the paper is bent in the rear bulge portion. The bent paper tries to return to its original state due to the restoring force. Since the uppermost paper has a strong force of the paper feeding roller, it is hardly affected by the restoring force and is pulled backward, and its tip moves to the front of the separating claw. On the other hand, even if the second and subsequent sheets of paper move rearward as the uppermost sheet of paper moves, they are greatly affected by the restoring force, so their tips do not move to the position of the separating claw. Absent. At this stage, the uppermost paper and the second and subsequent papers are separated. Then, the paper feed roll
The paper rotates in the paper feeding direction, the uppermost paper is fed in the paper feeding direction, is placed on the separating claw, and is conveyed inside the printer body.
After feeding the uppermost paper, the pressure lever is lowered and the separation claw is moved upward, so that the remaining second and subsequent sheets of paper are released from contact with the paper feed roller and the separation claw. The deflection of the paper returns to its original position.
【００１０】[0010]
【実施例】本発明をプリンタに適用した実施例を、図面
により以下に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a printer will be described below with reference to the drawings.
【００１１】図１および図２に、本発明により構成した
給紙カセット１を示す。同給紙カセット１は、その蓋体
の後部に後述するふくらみ部２を形成している。３は、
同じく後述する加圧レバーである。1 and 2 show a paper feed cassette 1 constructed according to the present invention. The paper feeding cassette 1 has a bulge portion 2 which will be described later, at the rear portion of its lid. 3 is
The pressure lever is also described below.
【００１２】図３において、給紙カセット１内に積層紙
Ｐが収納されており、該積層紙３の上方に給紙ロ−ラ４
が設けられている。給紙ロ−ラ４は紙への吸着力の比較
的強い材質よりなり、そしてプリンタ本体に搭載のモー
タにより、紙の給紙方向におよびその反対の方向に回転
するように駆動可能となっている。In FIG. 3, a laminated paper P is stored in a paper feed cassette 1, and a paper feed roller 4 is placed above the laminated paper 3.
Is provided. The paper feed roller 4 is made of a material having a relatively strong adsorption force to the paper, and can be driven by a motor mounted in the printer main body so as to rotate in the paper feed direction and the opposite direction. There is.
【００１３】給紙カセット１の給紙方向の前部に、分離
爪５ならびに本体給紙ロ−ラ６が配置されている。ま
た、給紙カセット１の下部には、積層紙３の最上側の紙
を給紙ロ−ラ４に接触させるための既述の加圧レバー
３、およびこの加圧レバー３を収納積載紙Ｐの厚さに従
い上下に調節するための上昇レバー７が設けられてい
る。前記の本体給紙ロ−ラ６および上昇レバー７は、い
ずれも本体に搭載のモータにより駆動される。さらに、
上昇レバー７による紙の接触を制御するために、図示さ
れていないが、軸の取付け部に圧力センサが設置されて
いる。A separation claw 5 and a main body paper feed roller 6 are arranged at the front of the paper feed cassette 1 in the paper feed direction. In the lower part of the paper feed cassette 1, the above-mentioned pressure lever 3 for bringing the uppermost paper of the laminated paper 3 into contact with the paper feed roller 4, and the pressure lever 3 for accommodating the stacked paper P. A lifting lever 7 is provided for adjusting up and down according to the thickness of the. Both the main body feed roller 6 and the lifting lever 7 are driven by a motor mounted on the main body. further,
In order to control the contact of the paper by the raising lever 7, although not shown, a pressure sensor is installed at the mounting portion of the shaft.
【００１４】給紙カセット１には、その給紙方向の前部
に紙が上方向に出ないように蓋部分１ａ（図１および図
２）が、そしてその後部には既述のふくらみ部２が設け
られている。The paper feed cassette 1 is provided with a lid portion 1a (FIGS. 1 and 2) at the front of the paper feed direction so that the paper does not come out upward, and at the rear thereof is the above-mentioned bulge portion 2a. Is provided.
【００１５】本発明による給紙方法の紙搬送態様につい
て、以下に説明する。The paper conveying mode of the paper feeding method according to the present invention will be described below.
【００１６】（i）給紙命令を受けたプリンタは、上昇
レバー７が加圧レバー３を上方向に移動させ、給紙カセ
ット１内に収納された積層紙Ｐを給紙ロ−ラ４に接触さ
せる（図３）。この際の紙と給紙ロ−ラ４との接触圧を
小さく抑えるため、前記圧力センサの値により上昇レバ
ー７の上下位置を制御する。(I) In the printer which has received the paper feed command, the lifting lever 7 moves the pressure lever 3 upward, and the laminated paper P stored in the paper feed cassette 1 is fed to the paper feed roller 4. Contact (Fig. 3). In order to suppress the contact pressure between the paper and the paper feed roller 4 at this time, the vertical position of the raising lever 7 is controlled by the value of the pressure sensor.
【００１７】（ii）給紙する最上側の紙と２枚目以降の
紙とを分離させるため、まず給紙ロ−ラ４を給紙方向と
反対の方向に回転させる。このとき紙は、給紙カセット
１の後側壁により後方への移動を阻止されるので、後部
のふくらみ部２内でたわむことになる（図４）。(Ii) In order to separate the uppermost paper to be fed from the second and subsequent papers, the paper feed roller 4 is first rotated in the direction opposite to the paper feed direction. At this time, the paper is prevented from moving rearward by the rear side wall of the paper feed cassette 1, and thus is bent in the rear bulge portion 2 (FIG. 4).
【００１８】（iii)かくたわんだ紙は、復元力により元
に戻ろうとする。最上側の紙は、給紙ロ−ラ４の力が強
いので、前記復元力の作用を受けることは殆どなく、そ
の先端は分離爪５の手前まで移動する。これに対し、２
枚目以降の紙は、最上側の紙の移動につれて後方へ移動
するにしても、前記復元力の作用を大きく受けるので、
それらの先端が分離爪５の位置まで移動することはな
い。この場合、（i）で述べた接触圧が重要な要素であ
る。(Iii) The bent paper tries to return to its original state by the restoring force. Since the uppermost paper has a strong force of the paper feed roller 4, it is hardly affected by the restoring force, and its tip moves to the front of the separation claw 5. On the other hand, 2
The paper after the first sheet is greatly affected by the restoring force even if it moves backward as the uppermost paper moves,
Their tips do not move to the position of the separating claw 5. In this case, the contact pressure described in (i) is an important factor.
【００１９】（iv）分離爪５が最上側の紙に接合する高
さまで下がる（図４）。(Iv) The separating claw 5 is lowered to the height at which it joins the uppermost paper (FIG. 4).
【００２０】（v）給紙ロ−ラ４が給紙方向に回転す
る。最上側の紙は、分離爪５の上に載り給紙され、本体
給紙ロ−ラ６によりプリンタ本体内部へ搬送される（図
５）。(V) The paper feed roller 4 rotates in the paper feed direction. The uppermost paper is placed on the separating claw 5 and fed, and is conveyed into the printer main body by the main body feeding roller 6 (FIG. 5).
【００２１】（vi）紙を送り出した後、上昇レバー７を
下げて加圧レバー３を降下させ、それとともに分離爪５
が上方へ移動するので、紙のたわみが元へ戻ろうとす
る。これにより、残った２枚目以降の紙は元の位置へ戻
る（図６）。(Vi) After feeding the paper, the raising lever 7 is lowered to lower the pressure lever 3 and, at the same time, the separating claw 5
Moves upward, so that the bending of the paper tries to recover. As a result, the remaining second and subsequent sheets of paper return to their original positions (FIG. 6).
【００２２】前記の重送防止用の分離爪５は、従来給紙
カセットの本体に付いており、そのため紙の補充の際に
障害となることが避けられなかった。このような障害の
ない給紙カセットを、図７に示す。The separation feed claw 5 for preventing the double feed is attached to the main body of the paper feed cassette in the related art, so that it is unavoidable that it interferes with the replenishment of paper. FIG. 7 shows a paper feed cassette without such a trouble.
【００２３】図７において、給紙カセット本体１１内
に、収納積載紙の横幅を整えるための衝立１２ａ、１２
ｂが配置され、底部には加圧レバー１３が設けられてい
る。１４は該給紙カセット本体１１の取外し可能な蓋部
であり、その給紙方向先端部の両隅角部に紙の重送防止
用分離爪１５が取付けられている。In FIG. 7, partitions 12a, 12 for adjusting the width of the stored stacked papers are provided in the paper feed cassette body 11.
b is arranged, and a pressure lever 13 is provided on the bottom. Reference numeral 14 denotes a removable lid portion of the paper feed cassette main body 11, and separation claws 15 for preventing double feeding of paper are attached to both corners of the leading end portion in the paper feed direction.
【００２４】従って、紙の補充のために蓋部１１を給紙
カセット本体１１から外すときは、分離爪１５も外され
るので、紙の補充の際この分離爪１５が障害となること
はない。蓋部１１を給紙カセット本体１１に装着すると
きは、分離爪１５は充分にその機能を発揮し、蓋部１１
に取付けているために機能を損なうことはない。Therefore, when the lid portion 11 is removed from the paper feed cassette body 11 for replenishing paper, the separating claw 15 is also removed, so that the separating claw 15 does not become an obstacle when replenishing paper. .. When the lid portion 11 is attached to the paper feed cassette main body 11, the separation claw 15 fully exerts its function.
There is no loss of functionality because it is installed in.
【００２５】[0025]
【発明の効果】紙を給紙方向と反対の方向に移動させて
たわませることにより、最上側の紙と２枚目以降の紙と
は分離される。ついで、紙を給紙方向に送ることによ
り、最上側の紙を確実に１枚のみ送り出すことができ
る。By moving and bending the paper in the direction opposite to the paper feeding direction, the uppermost paper and the second and subsequent papers are separated. Then, by feeding the paper in the paper feed direction, it is possible to reliably feed only the topmost paper.
【００２６】加圧レバーは、紙搬送時上方に移動して紙
と給紙ロ−ラとを接触させるが、搬送終了時は下方へ移
動して紙と給紙ロ−ラとの前記接触をなくするので、搬
送後の２枚目以降の紙のたわみを解消し、それらの元の
位置への戻りを助長する。The pressure lever moves upward when the paper is conveyed to bring the paper into contact with the paper feed roller, but at the end of the conveyance, moves downward so that the paper comes into contact with the paper feed roller. Since it is eliminated, the deflection of the second and subsequent sheets of paper after conveyance is eliminated, and the return of these sheets to their original positions is promoted.
【００２７】分離爪が紙搬送時に降下して紙に接触し、
非搬送時に上昇して紙より離れることによっても、加圧
レバーの場合と同じく、搬送後の２枚目以降の紙のたわ
みを解消し、それらの元の位置への戻りを助長する。When the separation claw moves down during paper conveyance, it comes into contact with the paper,
Even when the paper is lifted and separated from the paper during non-conveyance, the deflection of the second and subsequent papers after the conveyance is eliminated and the return to their original position is promoted, as in the case of the pressure lever.
【図１】図１は給紙カセットの平面図である。FIG. 1 is a plan view of a paper feed cassette.
【図２】図２は給紙カセットの側面図である。FIG. 2 is a side view of a paper feed cassette.
【図３】図３は給紙開始前の給紙装置の説明図である。FIG. 3 is an explanatory diagram of a sheet feeding device before starting sheet feeding.
【図４】図４は給紙ローラ逆転時の給紙装置の説明図で
ある。FIG. 4 is an explanatory diagram of a sheet feeding device when the sheet feeding roller rotates in the reverse direction.
【図５】図５はついで給紙ローラが正回転するときの給
紙装置の説明図である。FIG. 5 is an explanatory diagram of the sheet feeding device when the sheet feeding roller is normally rotated.
【図６】図６は給紙終了後の給紙装置の説明図である。FIG. 6 is an explanatory diagram of a sheet feeding device after sheet feeding is completed.
【図７】図７は給紙カセットの分解斜視図である。FIG. 7 is an exploded perspective view of a paper feed cassette.
１ 給紙カセット ２ ふくらみ部 ３ 加圧レバー ４ 給紙ローラ ５ 分離爪 ７ 上昇レバー Ｐ 積層紙 1 Paper feed cassette 2 Bulging part 3 Pressurizing lever 4 Paper feed roller 5 Separation claw 7 Lift lever P Laminated paper
Claims (4)
紙ロ−ラを備える画像形成装置の給紙方法において、前
記給紙ロ−ラを給紙方向の反対に回転させて紙を給紙方
向の反対に引き、ついで前記給紙ロ−ラを給紙方向に回
転させて紙を送り出すことを特徴とする給紙方法。1. A paper feeding method of an image forming apparatus comprising a paper feeding roller for feeding the uppermost paper of laminated paper, wherein the paper feeding roller is rotated in the opposite direction to the paper feeding direction. A paper feeding method characterized in that the paper is fed by pulling in the opposite direction to the paper feeding direction and then rotating the paper feeding roller in the paper feeding direction.
積層紙の最上側の紙を送り出すための給紙ロ−ラとを備
える画像形成装置の給紙装置において、前記給紙ロ−ラ
が給紙方向およびその反対方向に回転駆動可能であり、
そして前記給紙カセットが、その後部に紙がたわんで曲
がることのできる空間を有することを特徴とする給紙装
置。2. A paper feeding device of an image forming apparatus, comprising: a paper feeding cassette for accommodating laminated paper; and a paper feeding roller for feeding the uppermost paper of the laminated paper. Can be driven to rotate in the paper feeding direction and the opposite direction,
Further, the paper feeding cassette has a space at a rear portion thereof where the paper can be bent and bent.
接触させるための加圧レバーを有する請求項２に記載の
給紙装置において、前記加圧レバーが紙搬送時積層紙を
給紙ロ−ラに接触させるため上方に移動し、搬送終了時
下方へ移動して積層紙を給紙ロ−ラより離隔させること
を特徴とする給紙装置。3. The paper feeding apparatus according to claim 2, further comprising a pressure lever for bringing the laminated paper in the paper feeding cassette into contact with the paper feeding roller, wherein the pressure lever causes the laminated paper to be conveyed during paper conveyance. A paper feeding device characterized in that the paper feed roller is moved upward to come into contact with the paper feed roller, and is moved downward at the end of conveyance to separate the laminated paper from the paper feed roller.
めの分離爪を備えた請求項２または請求項３に記載の給
紙装置において、前記分離爪が、紙搬送時に降下して紙
に接触し、搬送終了時に上昇して紙より離れることを特
徴とする給紙装置。4. The paper feeding device according to claim 2, further comprising a separating claw for separating only the uppermost paper from the laminated paper, wherein the separating claw is lowered during paper conveyance. A paper feeding device that comes into contact with a sheet of paper and rises at the end of conveyance to separate from paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3310607A JPH05147752A (en) | 1991-11-26 | 1991-11-26 | Method and device for sheet feed in image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3310607A JPH05147752A (en) | 1991-11-26 | 1991-11-26 | Method and device for sheet feed in image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05147752A true JPH05147752A (en) | 1993-06-15 |
Family
ID=18007296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3310607A Pending JPH05147752A (en) | 1991-11-26 | 1991-11-26 | Method and device for sheet feed in image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05147752A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013124175A (en) * | 2011-12-15 | 2013-06-24 | Konica Minolta Business Technologies Inc | Image forming apparatus |
| US8511669B2 (en) | 2010-11-02 | 2013-08-20 | Canon Kabushiki Kaisha | Sheet feeding apparatus and image forming apparatus |
| US8540230B2 (en) | 2011-12-26 | 2013-09-24 | Canon Kabushiki Kaisha | Sheet feeding apparatus and image forming apparatus with curvature formation portion and reversely rotatable feeding roller |
| US8613439B2 (en) | 2012-01-12 | 2013-12-24 | Canon Kabushiki Kaisha | Sheet feeding apparatus and image forming apparatus |
| US9016685B2 (en) | 2011-07-07 | 2015-04-28 | Canon Kabushiki Kaisha | Sheet feeding device and image forming apparatus |
-
1991
- 1991-11-26 JP JP3310607A patent/JPH05147752A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8511669B2 (en) | 2010-11-02 | 2013-08-20 | Canon Kabushiki Kaisha | Sheet feeding apparatus and image forming apparatus |
| US9016685B2 (en) | 2011-07-07 | 2015-04-28 | Canon Kabushiki Kaisha | Sheet feeding device and image forming apparatus |
| JP2013124175A (en) * | 2011-12-15 | 2013-06-24 | Konica Minolta Business Technologies Inc | Image forming apparatus |
| US8540230B2 (en) | 2011-12-26 | 2013-09-24 | Canon Kabushiki Kaisha | Sheet feeding apparatus and image forming apparatus with curvature formation portion and reversely rotatable feeding roller |
| US8613439B2 (en) | 2012-01-12 | 2013-12-24 | Canon Kabushiki Kaisha | Sheet feeding apparatus and image forming apparatus |
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