JPH05229674A - Device for feeding and pressing paper - Google Patents

Device for feeding and pressing paper

Info

Publication number
JPH05229674A
JPH05229674A JP4061067A JP6106792A JPH05229674A JP H05229674 A JPH05229674 A JP H05229674A JP 4061067 A JP4061067 A JP 4061067A JP 6106792 A JP6106792 A JP 6106792A JP H05229674 A JPH05229674 A JP H05229674A
Authority
JP
Japan
Prior art keywords
paper
recording paper
feeding
bottom plate
size
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
JP4061067A
Other languages
Japanese (ja)
Inventor
Toshiaki Kameyama
敏明 亀山
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP4061067A priority Critical patent/JPH05229674A/en
Publication of JPH05229674A publication Critical patent/JPH05229674A/en
Pending legal-status Critical Current

Links

Landscapes

  • Paper Feeding For Electrophotography (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Abstract

PURPOSE:To enable pressure exerted by a paper feeding roller in feeding paper to be constantly controlled to a predetermined value so as to prevent failure in feeding paper such as overlap and lack feeding by providing a paper feed pressure control mechanism which is controlled in accordance with data about the residual amount of recording paper and data about the size of the recording paper. CONSTITUTION:An opening 7 which a pushing lever 18 for pushing a freely rotatable bottom plate 3 faces is formed through the bottom portion of a tray 1 and a size detecting plate 9 is provided on the paper-feed side outer wall of the tray. A bottom- plate lifting mechanism including the pushing lever 18 is provided in the portion of an image forming device corresponding to the bottom portion of the tray 1, and a detection means for the residual amount of recording paper is provided which comprises a fan-shaped encoder 22 provided at one side of a shaft 16 to which the pushing lever 18 is fixed and a sensor 24. An energizing force is applied to the encoder 22 by a spring 20 the force of which is controlled by a paper feed pressure control mechanism 30 so that pressure at which paper is fed is freely adjustable via the pushing lever 18 and the pressure motor 33 of the paper feed pressure control mechanism 30 is controlled in accordance with data about the residual amount and the size of recording paper.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は複写機等の画像形成装置
の給紙機構の改良に関し、特に給紙トレイ内において底
板上に積載した記録紙上面を給紙ローラに圧接するため
の加圧機構の改良に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a sheet feeding mechanism of an image forming apparatus such as a copying machine, and more particularly, to pressurizing the upper surface of a recording sheet stacked on a bottom plate in a sheet feeding tray with a sheet feeding roller. Regarding the improvement of the mechanism.

【0002】[0002]

【従来の技術】複写機、プリンタ、ファクシミリ装置等
の画像形成装置は、複数のシート状記録紙を積層した給
紙部から記録紙を一枚づつ取り出して作像部、印字部等
に給送することにより、記録紙上に画像を形成する機構
を有している。前記給紙部は記録紙束を積載する給紙カ
セット(給紙トレイ)と、該給紙カセット内の記録紙束
の最上面に圧接して一枚づつ取り出し前記作像部等へ向
かう搬送路へ送り出す給紙ローラと、重送を防止する分
離ローラと、記録紙束を積載する底板を給紙ローラに向
けて押し上げるためのバネ等の押圧手段等を有する。
2. Description of the Related Art An image forming apparatus such as a copying machine, a printer, or a facsimile machine takes out recording papers one by one from a paper feed unit in which a plurality of sheet-like recording papers are stacked and feeds them to an image forming unit, a printing unit and the like. By doing so, a mechanism for forming an image on the recording paper is provided. The paper feed unit is a paper feed cassette (paper feed tray) on which a bundle of recording paper is stacked, and a conveyance path for pressing the uppermost surface of the bundle of recording paper in the paper feed cassette to take out the sheets one by one and to the image forming unit or the like. It has a paper feed roller for feeding to, a separation roller for preventing double feed, a pressing means such as a spring for pushing up a bottom plate on which a bundle of recording paper is loaded, toward the paper feed roller.

【0003】ところで、一つの給紙カセットによって異
なったサイズの記録紙を収容可能な構成を有したユニバ
ーサルトレイが従来から周知であるが(例えば、特開昭
62−205927号公報)、異なったサイズの記録紙
を収容した場合、サイズに応じて記録紙束の重量が変動
してくるため、記録紙束を積載する底板を押し上げる押
圧手段からの押圧力を記録紙サイズに応じて調整する必
要が生じる。即ち、バネ等による底板に対する押圧力が
積載する記録紙のサイズの変化に関係なく一定である
と、大サイズ記録紙の場合には重量が大きくなるために
バネによる押圧力が不足して給紙ローラによる給紙圧が
小さくなって不送りを起こし、小サイズ記録紙の場合に
はバネ力が強過ぎて給紙圧が過大となって重送が発生し
易い等の不具合を生じる。
By the way, a universal tray having a structure capable of accommodating recording papers of different sizes by one paper feeding cassette has been conventionally known (for example, JP-A-62-205927), but different sizes. Since the weight of the recording paper bundle fluctuates depending on the size of the recording paper, it is necessary to adjust the pressing force from the pressing means that pushes up the bottom plate on which the recording paper stack is stacked according to the recording paper size. Occurs. That is, if the pressing force applied to the bottom plate by the spring or the like is constant irrespective of the change in the size of the recording paper to be loaded, the pressing force by the spring is insufficient due to the large weight of the large size recording paper, and the paper is fed. The paper feed pressure by the rollers becomes small and feeding failure occurs, and in the case of small size recording paper, the spring force is too strong and the paper feed pressure becomes excessively large, so that double feeding easily occurs.

【0004】このようなところから、特開昭56−82
744号公報、特開平1−156236号公報、特開昭
62−205927号公報には、収容した記録紙のサイ
ズに応じて底板への加圧力を変化し得るように構成した
給紙装置が開示されている。
From such a point, Japanese Patent Laid-Open No. 56-82
Japanese Patent Laid-Open No. 744, Japanese Patent Laid-Open No. 1-156236, and Japanese Patent Laid-Open No. 62-205927 disclose a paper feeding device configured so that the pressure applied to the bottom plate can be changed according to the size of the recording paper stored. Has been done.

【0005】例えば特開昭56−82744号公報に
は、記録紙を積載する底板を一つの軸によって上下方向
へ回動自在に支持すると共に、該底板を一定のバネ力に
より押し上げる押圧部材と、記録紙サイズに応じて移動
する記録紙のエンドガイドと、該エンドガイドと一体的
に移動するように底板に係合せしめたカムと、該カムに
係合し該カムの位置に応じて該押圧部材先端部と底板と
の接触位置を移動させることにより押圧部材による押圧
力を有効に発揮させたり該押圧力を減少させる方向へ作
用せしめる補助押圧部材を備えた構成が開示されてい
る。この給紙装置によれば、収容するサイズに応じて底
板の押上げ力を切り替えることが可能となるため、給紙
ローラと記録紙との間の圧接力を常に一定の範囲に保持
することが可能となる。
For example, in Japanese Unexamined Patent Publication No. 56-82744, a bottom plate on which recording paper is stacked is supported by one shaft so as to be vertically rotatable, and a pressing member for pushing up the bottom plate by a constant spring force is provided. An end guide of the recording paper that moves according to the size of the recording paper, a cam that is engaged with the bottom plate so as to move integrally with the end guide, and the pressing that engages with the cam according to the position of the cam. Disclosed is a configuration including an auxiliary pressing member that moves the contact position between the tip of the member and the bottom plate to effectively exert the pressing force of the pressing member or to act in the direction of decreasing the pressing force. According to this paper feeding device, the pushing force of the bottom plate can be switched according to the size to be accommodated, so that the pressure contact force between the paper feeding roller and the recording paper can always be kept within a certain range. It will be possible.

【0006】しかしながら、この給紙装置にあっては、
収容しようとする記録紙サイズの変更に応じて移動する
のはエンドガイドだけであるため、異なったサイズの記
録紙を収容する場合であっても給紙方向によっては同一
サイズのものとして扱われることもあり得る。例えば、
A4横送りとA5縦送りではエンドガイドの位置は同一
であるため、同一の給紙圧にて給紙される虞れが強い
が、重量の違いが大きい以上、押圧部材による押上げ力
を変える必要があり、この給紙装置ではこの問題を解決
できない。換言すれば、この従来装置では記録紙の給紙
方向サイズに応じて押圧部材による底板押上げ位置を移
動させるようにしているだけなので、給紙方向と直交す
る方向のサイズの変化に応じた対応が不可能となる。
However, in this paper feeding device,
Since only the end guide moves according to the change in the recording paper size to be accommodated, even if recording papers of different sizes are to be accommodated, they should be treated as the same size depending on the paper feeding direction. There is also a possibility. For example,
Since the positions of the end guides are the same in A4 horizontal feed and A5 vertical feed, there is a strong possibility that the paper will be fed at the same paper feed pressure, but since the difference in weight is large, the pushing force by the pressing member is changed. It is necessary, and this paper feeder cannot solve this problem. In other words, in this conventional apparatus, only the bottom plate pushing-up position of the pressing member is moved according to the size of the recording paper in the paper feeding direction, so that it is possible to cope with the change in size in the direction orthogonal to the paper feeding direction. Becomes impossible.

【0007】また、同一サイズの記録紙を給紙する場合
においても積載枚数の多寡に応じて積載重量が変動する
ため、当該サイズに合わせて押圧部材による押圧力を一
定に設定しておくと記録紙枚数の減少に応じて給紙ロー
ラによる給紙圧が不適切な値となるが、上記公報記載の
装置によれば、給紙圧を一定に保持するための配慮がな
されておらず、重送、不送り等の給紙不良が生じやす
い。
Further, even when recording sheets of the same size are fed, the stacking weight varies depending on the number of stacked sheets. Therefore, if the pressing force of the pressing member is set to be constant in accordance with the size, the recording is performed. The paper feed pressure by the paper feed roller becomes an inappropriate value as the number of paper sheets decreases, but the apparatus described in the above publication does not take into consideration the need to keep the paper feed pressure constant. Feeding defects such as feeding and non-feeding are likely to occur.

【0008】また、回転しにくい構成のフリクションロ
ーラに対して回転する給紙ローラをニップさせた構成を
有した摩擦分離給紙機構においては、底板上の記録紙は
加圧バネを介して押圧レバーにより押し上げられている
ため、記録紙と給紙ローラとの接触圧力(給紙圧PA
値)は記録紙サイズや記録紙の残量に応じて変動する。
図8はB5縦サイズと、A3縦サイズを夫々積載した場
合における記録紙残量と給紙圧との関係を示す図であ
り、B5縦サイズを250枚積載時の給紙圧は約650
gfが最適であり、A3サイズを250枚積載時の給紙
圧は約300gfが最適であり、積載枚数が0枚の場合
の給紙圧は両サイズ共に400gfとなる。この図から
明らかなようにB5縦とA3とでは、最適な給紙圧に約
300gfの差が生じるため、多サイズの記録紙に共通
した給紙可能範囲(バネ圧の値)を広く確保することが
困難となる。この結果、重送、不送りといった不具合を
生じる。
Further, in the friction separating paper feeding mechanism having a structure in which a rotating paper feeding roller is nipped with respect to a friction roller which is hard to rotate, the recording paper on the bottom plate is pressed by a pressing lever via a pressing spring. Since it is pushed up by the contact pressure of the recording paper and the feed roller (feed pressure P A
The value) varies depending on the recording paper size and the remaining amount of recording paper.
FIG. 8 is a diagram showing the relationship between the remaining amount of recording paper and the feeding pressure when the B5 vertical size and the A3 vertical size are stacked, and the feeding pressure when the B5 vertical size is 250 sheets is loaded is about 650.
The optimum gf is about 300 gf when the A3 size is 250 sheets, and the feeding pressure when the number of stacked sheets is 0 is 400 gf for both sizes. As is clear from this figure, there is a difference of about 300 gf in the optimum paper feeding pressure between B5 vertical and A3, so a wide paper feedable range (value of spring pressure) common to multi-size recording paper is secured. Becomes difficult. As a result, problems such as double feeding and non-feeding occur.

【0009】従って、上記公報記載の給紙装置によって
押圧部材による押圧力を変化させる場合には、記録紙面
積が比較的近い2種類の記録紙については、紙サイズの
変化にはある程度対応が可能であり、最大の積載枚数か
ら1枚に至るまである程度の給紙状態を維持することが
できる。しかしながら、面積差が2種類を越える紙サイ
ズに対応して押圧力を変化させようとするならば、バネ
自体を交換する必要があり、そのためには何種類ものト
レイを予め用意しておく必要がある。
Therefore, when the pressing force of the pressing member is changed by the paper feeding apparatus described in the above publication, it is possible to cope with the change in the paper size to some extent for two types of recording papers having relatively small recording paper areas. Therefore, it is possible to maintain the paper feed state to some extent from the maximum number of stacked sheets to one sheet. However, if it is desired to change the pressing force corresponding to a paper size with an area difference of more than two types, it is necessary to replace the spring itself, and for that purpose, it is necessary to prepare many types of trays in advance. is there.

【0010】これを更に詳述する。図9(a) 及び(b) は
フリクションローラ101を給紙ローラ102に対して
連れ回りするように圧接させた構成を有した給紙機構を
示し、同図(a) において押上げアームにより押し上げら
れる底板上の記録紙上面が給紙コロ102に圧接する給
紙圧をPA とし、両ローラ101、102のニップ部に
おける分離圧をPB とし、フリクションローラ101に
よる給紙阻止力(分離力)をTA とした場合における記
録紙一枚の搬送条件(不送り限界)は、次式(1) により
表される(但し、紙の重量は無視)。
This will be described in more detail. 9 (a) and 9 (b) show a paper feed mechanism having a structure in which the friction roller 101 is pressed against the paper feed roller 102 so as to rotate together with the paper feed roller 102. In FIG. The paper feed pressure at which the upper surface of the recording paper on the bottom plate is pressed against the paper feed roller 102 is P A, and the separation pressure at the nip portion of both rollers 101 and 102 is P B. The transport condition (non-feed limit) for one sheet of recording paper when) is T A is expressed by the following equation (1) (however, the weight of the paper is ignored).

【0011】 μRB +μRA >TA +μPA μRB >TA −(μR −μP )PA 従って、PB >(1/μR )TA −{1−(μP /μR )}PA ・・・(1) (但し、μR :フィードローラ102と記録紙との摩擦
係数、μP :紙間摩擦係数) また、同図(b) は2枚目の記録紙の分離条件(重送限
界)を説明する図であり、重送限界は次式(2) より表さ
れる。
Μ R P B + μ R P A > T A + μ P P A μ R P B > T A − (μ R −μ P ) P A Therefore, P B > (1 / μ R ) T A − { 1- (μ P / μ R )} P A ... (1) (where μ R is the friction coefficient between the feed roller 102 and the recording paper, μ P is the paper-to-paper friction coefficient). FIG. 6 is a diagram for explaining the separation condition (double feed limit) of the second recording sheet, and the double feed limit is expressed by the following equation (2).

【0012】 μPB +μP1A <TA +μP2A μPB <TA −[{(μP1−μP2)/PA }/△μP ] 従って、PB <(1/μP )TA −(△μP /μP )PA ・・・(2) (但し、μP1:1枚目と2枚目の紙間摩擦係数、μP2
2枚目と3枚目の紙間摩擦係数、△μP :紙間の摩擦係
数差(バラツキ)) また、(1) 、(2) 式は阻止力をTA としている(図示し
ないトルクリミッタの滑りにより一定トルクを得てい
る)ので、両式が成立する前提条件としてトルクリミッ
タ部で滑る条件、すなわちフリクションローラ101が
つれ回る条件として次式(3) を得ることができる。 TA <μR ’PB ・・・・(3) (但し、μR ’:フリクションローラと紙の摩擦係数) 次に、図10は、上記給紙機構における重送発生条件と
不送り発生条件を示す図表であり、この図から明らかな
ように底板を押し上げるバネによって得られる給紙圧P
A が300〜600gfの範囲内にあるために重送及び
不送りを起こさない給紙可能領域が図中Aで示す斜線部
分となる。これに対して給紙圧PA を300gfで一定
にした場合には給紙可能領域がBで示す斜線の範囲内と
なり、給紙可能領域が大幅に広がる。本発明はこのよう
な知見に基づいてなされたものである。
[0012] μ P P B + μ P1 P A <T A + μ P2 P A μ P P B <T A - [{(μ P1 -μ P2) / P A} / △ μ P] Accordingly, P B <( 1 / μ P) T a - (△ μ P / μ P) P a ··· (2) ( however, μ P1: between 1 sheet and the second sheet of paper friction coefficient, μ P2:
Friction coefficient between the second and third sheets, Δμ P : Difference in friction coefficient between papers (variation) In addition, in formulas (1) and (2), the blocking force is T A (torque limiter not shown). Since a constant torque is obtained by the slip of (1), the following expression (3) can be obtained as a precondition for both expressions to be satisfied, that is, a condition for slipping at the torque limiter portion, that is, a condition for the friction roller 101 rolling around. T AR 'P B (3) (where μ R ': friction coefficient between friction roller and paper) Next, FIG. 10 shows the double feed occurrence condition and non-feed occurrence in the paper feed mechanism. It is a chart showing the conditions, and as is clear from this figure, the sheet feeding pressure P obtained by the spring pushing up the bottom plate.
Since A is in the range of 300 to 600 gf, the paper feedable area where double feeding and non-feeding do not occur is the shaded portion indicated by A in the figure. On the other hand, when the paper feed pressure P A is kept constant at 300 gf, the paper feedable area falls within the shaded area indicated by B, and the paper feedable area is greatly expanded. The present invention has been made based on such findings.

【0013】[0013]

【発明の目的】本発明は上記に鑑みてなされたものであ
り、給紙圧を一定に保持することにより、重送、不送り
等の給紙不良の発生を大幅に低減した給紙加圧装置を提
供することを目的としている。
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and by maintaining the paper feeding pressure at a constant level, paper feeding pressurization in which the occurrence of paper feeding defects such as double feeding and non-feeding is greatly reduced is achieved. The purpose is to provide a device.

【0014】[0014]

【発明の構成】上記目的を達成するため、本願第1の発
明は、装置本体側に回転自在に軸支された給紙ローラに
対してトレイの底板上の記録紙の上面を圧接させるため
に該底板を押し上げる押圧レバーを備えた底板昇降機構
と、該押圧レバーの移動量から記録紙の残量を検知する
記録紙残量検知手段と、該底板昇降機構による底板押し
上げ力を調整する給紙圧調整機構と、該底板上に積載さ
れた記録紙サイズを検知する記録紙サイズ検知手段と、
上記各構成要素の動作を制御する制御部とを備え、前記
制御部は、前記記録紙残量検知手段により検出された記
録紙残量に関するデータと、前記記録紙サイズ検知手段
によって検出された記録紙サイズに関するデータとに基
づいて、前記給紙圧調整機構を制御することにより給紙
ローラによる給紙圧を所定に調節するようにしたことを
特徴とする。本願第2の発明では、前記記録紙残量検知
手段は、前記押圧レバーの変位量を検知するフォトセン
サとエンコーダとから成り、前記制御部は、該記録紙残
量検知手段により検知された記録紙残量に関するデータ
を不揮発性RAMに記憶させることを特徴とする。本願
第3の発明は、前記給紙加圧装置を摩擦分離給紙方式の
給紙装置に適用したことを特徴とする。本願第4の発明
は、前記給紙加圧装置をユニバーサルトレイに適用した
ことを特徴とする。
In order to achieve the above object, the first invention of the present application is to bring the upper surface of the recording paper on the bottom plate of the tray into pressure contact with the paper feed roller rotatably supported on the apparatus main body side. A bottom plate raising / lowering mechanism having a pressing lever for pushing up the bottom plate, a recording sheet remaining amount detecting means for detecting the remaining amount of recording paper from the amount of movement of the pressing lever, and a sheet feeding for adjusting the bottom plate pushing up force by the bottom plate raising / lowering mechanism. A pressure adjusting mechanism, and a recording paper size detecting means for detecting the size of the recording paper stacked on the bottom plate,
A control unit that controls the operation of each of the above-mentioned components, wherein the control unit includes data relating to the remaining amount of recording paper detected by the remaining recording paper amount detecting unit, and recording detected by the recording paper size detecting unit. It is characterized in that the paper feed pressure by the paper feed roller is adjusted to a predetermined value by controlling the paper feed pressure adjusting mechanism on the basis of the data regarding the paper size. In the second invention of the present application, the recording paper remaining amount detecting means includes a photosensor and an encoder for detecting the displacement amount of the pressing lever, and the control section records the recording amount detected by the recording paper remaining amount detecting means. It is characterized in that the data relating to the remaining amount of paper is stored in the nonvolatile RAM. A third invention of the present application is characterized in that the paper feeding pressurizing device is applied to a paper feeding device of a friction separation paper feeding system. A fourth invention of the present application is characterized in that the paper feeding and pressing device is applied to a universal tray.

【0015】以下、本発明を添付図面により詳細に説明
する。図1(a) 及び(b) は本発明の一実施例の概略構成
を示す縦断面図であり、(a) は押圧レバー7が底板3を
加圧していない状態を示し、(b) は加圧している状態を
示している。また、図2は図1(b) の状態を示す斜視図
である。
The present invention will be described in detail below with reference to the accompanying drawings. 1 (a) and 1 (b) are vertical cross-sectional views showing a schematic configuration of one embodiment of the present invention, (a) shows a state in which the pressing lever 7 is not pressing the bottom plate 3, and (b) shows The state of being pressurized is shown. 2 is a perspective view showing the state of FIG. 1 (b).

【0016】この給紙加圧装置は画像形成装置本体(或
は給紙装置本体)に着脱されるトレイ1内において支点
2により上下方向に回動自在に軸支された底板3上に積
載した記録紙Pのサイズ、方向、積載量に応じて底板3
を適正な圧力で押し上げることにより、記録紙束Pの上
面と給紙コロ5との給紙圧力を常に一定値に調整するよ
うにした点が特徴的である。
This paper feed pressurizing device is loaded on a bottom plate 3 which is pivotally supported in a vertical direction by a fulcrum 2 in a tray 1 which is attached to and detached from an image forming apparatus main body (or a paper feeding apparatus main body). The bottom plate 3 depending on the size, direction, and loading amount of the recording paper P.
Is characterized in that the paper feed pressure between the upper surface of the recording paper stack P and the paper feed roller 5 is always adjusted to a constant value by pushing up the paper feed roller 5 with an appropriate pressure.

【0017】トレイ1の底部には後述する底板押圧用の
押圧レバーをトレイ内に入り込ませるための開口部7が
形成され、更にトレイの給紙側外壁には記録紙Pのサイ
ズ変更に伴って移動する図示しないサイドガイドと連動
して移動するサイズ検知板9が設けられる。このサイズ
検知板9は後述するように画像形成装置側に設けたセン
サ(フォトインタラプタ)10により検知されることに
より、積載した記録紙サイズが検知される。トレイ1は
例えば図面左方から右方へ向けて装着される。サイズ検
知板9とセンサ10は記録紙サイズ検知手段を構成して
いる。
An opening 7 is formed on the bottom of the tray 1 for allowing a pressing lever for pressing a bottom plate, which will be described later, to enter the tray, and the outer wall of the tray on the paper feed side is changed in accordance with the size change of the recording paper P. A size detection plate 9 that moves in conjunction with a moving side guide (not shown) is provided. The size detecting plate 9 is detected by a sensor (photointerrupter) 10 provided on the image forming apparatus side, as described later, so that the size of the stacked recording sheets is detected. The tray 1 is mounted, for example, from the left side to the right side in the drawing. The size detection plate 9 and the sensor 10 constitute recording paper size detection means.

【0018】図示のように装着を完了したトレイ1の底
部に相当する画像形成装置部分には底板昇降機構15が
設けられている。この底板昇降機構15は、画像形成装
置に設けた軸16に基端部を一体化されるとともに先端
部を上記開口7からトレイ内に突入させて底板3の底面
に接触可能な押圧レバー18と、該軸16に基端部を一
体化されると共に先端部にてスプリング20の下端部を
支持した押圧アーム21と、該軸16に回転中心を一体
化された扇板形の第1のエンコーダ22と、第1のエン
コーダ22の周方向に沿って放射状に配列されたスリッ
ト23の移動経路に配置されエンコーダ22の回動角度
を検知するフォトインタラプタから成るセンサ24とを
有する。第1のエンコーダ22とセンサ24は、記録紙
残量検知手段を構成している。
As shown in the figure, a bottom plate elevating mechanism 15 is provided in the portion of the image forming apparatus corresponding to the bottom of the tray 1 which has been mounted. The bottom plate elevating mechanism 15 has a base end integrated with a shaft 16 provided in the image forming apparatus, and a pressing lever 18 that can be brought into contact with the bottom surface of the bottom plate 3 by protruding the tip end into the tray through the opening 7. A pressing arm 21 having a base end integrated with the shaft 16 and supporting a lower end of a spring 20 at a tip, and a fan-plate-shaped first encoder having a rotation center integrated with the shaft 16. 22 and a sensor 24, which is a photo interrupter and is arranged in the movement path of the slits 23 radially arranged along the circumferential direction of the first encoder 22 and detects the rotation angle of the encoder 22. The first encoder 22 and the sensor 24 constitute a recording paper remaining amount detecting means.

【0019】また、符号30は底板昇降機構15による
底板押し上げ力(記録紙と給紙ローラとの圧接力)を調
整する給紙圧調整機構であり、この給紙圧調整機構30
は画像形成装置本体に設けられた軸31により回動自在
に支持され先端部で前記スプリング20の上端部を支持
する加圧アーム33と、該加圧アームと一体化され該軸
31を中心として回動する第2のエンコーダ34と、該
エンコーダ34の周方向に沿って放射状に配列されたス
リット35の移動経路に配置されエンコーダ34の回動
角度を検知するフォトインタラプタから成るセンサ36
と、該軸31により軸心を一体的に支持された従動ギヤ
37と、出力ギヤG1からの駆動トルクを伝達ギヤG
2、G3を介して該従動ギヤ37に伝達し加圧アーム3
3を正逆転方向へ回動させる加圧モータ(DCモータ)
38とを有する。
Reference numeral 30 is a paper feed pressure adjusting mechanism for adjusting the bottom plate pushing-up force (pressure contact force between the recording paper and the paper feed roller) by the bottom plate lifting mechanism 15.
Is a pressure arm 33 that is rotatably supported by a shaft 31 provided in the main body of the image forming apparatus and that supports the upper end portion of the spring 20 at its tip portion; A sensor 36 including a rotating second encoder 34 and a photo interrupter arranged in a movement path of slits 35 radially arranged along the circumferential direction of the encoder 34 and configured to detect a rotation angle of the encoder 34.
And a driven gear 37 whose shaft center is integrally supported by the shaft 31 and a transmission gear G for transmitting the driving torque from the output gear G1.
2 and G3 to transmit to the driven gear 37 and pressurize arm 3
Pressure motor (DC motor) that rotates 3 in forward and reverse directions
38 and.

【0020】給紙ローラ5の下方に配置したフリクショ
ンローラ6は、図示しないバネにより給紙ローラ5の外
周面に圧接され、所定のトルクをもって給紙ローラ5に
連れ回りするように構成されている。本実施例は、押圧
レバー18による底板押し上げ力をバネによって連結さ
れた給紙圧調整機構30により調整する構成が特徴的で
あり、そのために図3のブロック図に示すように紙サイ
ズセンサ10により検知された紙サイズ及び各エンコー
ダ22、34により検知される押圧レバー15の押し上
げ位置(記録紙積載量)等のデータを用いて制御部40
が必要な制御を行うよう構成している。ROMには各検
知信号に基づいて行うべき必要な制御データを格納す
る。
The friction roller 6 arranged below the paper feed roller 5 is pressed against the outer peripheral surface of the paper feed roller 5 by a spring (not shown) so as to rotate with the paper feed roller 5 with a predetermined torque. .. The present embodiment is characterized in that the bottom plate pushing-up force of the pressing lever 18 is adjusted by the paper feed pressure adjusting mechanism 30 connected by a spring. Therefore, as shown in the block diagram of FIG. The control unit 40 uses data such as the detected paper size and the push-up position (recording paper stacking amount) of the pressing lever 15 detected by the encoders 22 and 34.
Is configured to perform the necessary control. The ROM stores necessary control data to be performed based on each detection signal.

【0021】第1及び第2のエンコーダ22、34及び
センサ24、36は、図4(a) に示すような構成を有し
ている。各センサ24、36には発光素子及び受光素子
から成る第1及び第2のフォトインタラプタ45、46
が所定間隔をおいて2対配置されており、図4(b) に示
すように両フォトインタラプタ45、46がOFF(透
過)の時にはエンコーダが両インタラプタの位置に達し
ていない初期の状態であり、いずれか一方がON(遮
蔽)か、両者がONの時には加圧継続状態にあることと
なる。
The first and second encoders 22 and 34 and the sensors 24 and 36 have the structure shown in FIG. 4 (a). Each sensor 24, 36 has a first and a second photo interrupter 45, 46 composed of a light emitting element and a light receiving element.
2 are arranged at a predetermined interval, and as shown in FIG. 4 (b), when both photo interrupters 45 and 46 are OFF (transmission), the encoder is in the initial state where it has not reached the position of both interrupters. When either one is ON (shielding) or both are ON, the pressurization is continued.

【0022】次に、底板上の記録紙束Pが給紙ローラ5
に圧接する際の圧接力(給紙圧)を一定に保持するため
に、記録紙サイズ、方向、残量等の条件の変更に応じて
押圧レバー18による底板の押圧力を増減する制御手順
について説明する。
Next, the bundle of recording paper P on the bottom plate is fed by the paper feed roller 5.
Regarding the control procedure for increasing or decreasing the pressing force of the bottom plate by the pressing lever 18 in accordance with changes in conditions such as recording paper size, direction, remaining amount, etc., in order to keep the pressing force (feeding pressure) when pressing against explain.

【0023】図示しない画像形成装置本体の電源が投入
されてサイズ検知手段9、10からのサイズ検知信号に
より加圧モータ38がONして正転を開始すると、加圧
アーム33及び第2のエンコーダ34は図1の初期状態
から反時計廻り方向へ回動し、制御部40はセンサ2
4、36を構成するフォトインタラプタが最初に遮蔽さ
れた(非スリット部に対面した位置)をホームポジショ
ンとして認識する。従って本実施例ではこのホームポジ
ョションは各エンコーダ22、34の左側端縁となる。
該加圧アーム33が正転すると、バネを介して連結され
た押圧レバー18は底板3に向けて上昇を開始する。該
加圧アーム33が該ホームポジションを越えて反時計廻
り方向へ更に回動した結果、押圧レバー18によって押
し上げられた底板上の記録紙Pが給紙ローラ5に接して
それ以上上昇不能となった時に該給紙ローラの回転軸に
連設された図示しない記録紙上限検知センサが記録紙の
上限を検知した信号を制御部40に出力する。
When the power of the image forming apparatus main body (not shown) is turned on and the pressure motor 38 is turned on by the size detection signal from the size detection means 9 and 10 to start the normal rotation, the pressure arm 33 and the second encoder. 34 rotates counterclockwise from the initial state of FIG.
It is recognized that the photointerrupters forming Nos. 4 and 36 are first shielded (the position facing the non-slit portion) as the home position. Therefore, in this embodiment, this home position is the left edge of each encoder 22, 34.
When the pressure arm 33 rotates in the forward direction, the pressing lever 18 connected via the spring starts to move up toward the bottom plate 3. As a result of the pressure arm 33 further rotating counterclockwise beyond the home position, the recording paper P on the bottom plate pushed up by the pressing lever 18 comes into contact with the paper feed roller 5 and cannot be further raised. At this time, a recording paper upper limit detection sensor (not shown) connected to the rotary shaft of the paper feeding roller outputs a signal to the control unit 40 to detect the upper limit of the recording paper.

【0024】上限が検知された時における第1のエンコ
ーダ22の角度、換言すれば、前記ホームポジションか
ら上限検知に達するまでにカウントされたパルス数に基
づいて制御部40は記録紙の残量を判定する。制御部4
0では、記録紙サイズ検知手段9、10から得た記録紙
サイズ及び方向に関するデータと、残量に関するデータ
に基づいて加圧モータ38を必要量だけ正逆転させて、
常に給紙圧が一定となるように制御する。この制御情報
は図5のデータテーブルに示した如きものであり、RO
M等に格納される。
The control unit 40 determines the remaining amount of recording paper based on the angle of the first encoder 22 when the upper limit is detected, in other words, the number of pulses counted from the home position until the upper limit is detected. judge. Control unit 4
At 0, the pressure motor 38 is normally and reversely rotated by a required amount based on the data regarding the recording paper size and direction obtained from the recording paper size detecting means 9 and 10 and the data regarding the remaining amount.
Control is performed so that the paper feed pressure is always constant. This control information is as shown in the data table of FIG.
It is stored in M or the like.

【0025】図5によれば、残量が1枚から100枚ま
での間では、加圧モータ38による正転方向への回転量
の増大のペースは変わりないが、150枚辺りから徐々
に異なっている。このように回転量を変動させる理由
は、記録紙サイズの違いによる重量の変化、記録紙のセ
ット方向の違いにより押圧レバーに求められる押圧力の
変化の必要などに求められる。ここでは、+方向が正転
方向、−方向が逆転方向であり、記録紙の重量が重い場
合には給紙圧を一定に保持するためにより強い力で底板
3を押し上げる必要があるために第2のエンコーダ34
の正転方向の回転量が増大する。記録紙が費消されて残
量が少なくなるに応じて第1のエンコーダ22がバネ2
0により引き上げられて反時計廻り方向へ回動するの
で、制御部40は残量が減少したことを検知し、加圧モ
ータ38を再度ONさせて逆転方向へ所定パルス分だけ
加圧アーム33を回動させる。このことにより、減少し
た残量に適した弱い給紙圧を得ることができる。
According to FIG. 5, the pace of increase in the amount of rotation in the forward direction by the pressure motor 38 does not change when the remaining amount is from 1 to 100 sheets, but it gradually changes from around 150 sheets. ing. The reason for changing the rotation amount in this way is required to change the weight due to the difference in the size of the recording paper and the change in the pressing force required for the pressing lever due to the difference in the setting direction of the recording paper. Here, the + direction is the forward rotation direction and the − direction is the reverse rotation direction, and when the weight of the recording paper is heavy, it is necessary to push up the bottom plate 3 with a stronger force to keep the paper feeding pressure constant. 2 encoder 34
The amount of rotation in the normal direction of is increased. As the recording paper is consumed and the remaining amount decreases, the first encoder 22 causes the spring 2 to move.
Since it is pulled up by 0 and rotates in the counterclockwise direction, the control unit 40 detects that the remaining amount has decreased, turns on the pressurizing motor 38 again, and moves the pressurizing arm 33 by a predetermined pulse in the reverse direction. Rotate. This makes it possible to obtain a weak sheet feeding pressure suitable for the reduced remaining amount.

【0026】図6は上記トレイ1の概略構成を示す斜視
図であり、所謂ユニバーサルトレイと称されるタイプの
記録紙収納手段である。トレイ1の内部に設けた底板3
の両側方には給紙方向と直交する方向へ進退可能に構成
されたサイドガイド45a,45bがあり、前記サイズ
検知板9は一方にサイドガイドから給紙方向へ突出して
いる。サイズ検知板9はサイドガイドの移動に応じて矢
印方向へ進退する。前記センサ10はサイズ検知板9の
移動方向に沿って複数配列されており、サイドガイド間
に配置される記録紙の幅方向サイズを検知する。
FIG. 6 is a perspective view showing a schematic structure of the tray 1, which is a so-called universal tray type recording paper storage means. Bottom plate 3 provided inside the tray 1
There are side guides 45a and 45b arranged on both sides of the side guides 45a and 45b so as to be movable back and forth in a direction orthogonal to the sheet feeding direction. The size detection plate 9 moves back and forth in the direction of the arrow as the side guide moves. A plurality of the sensors 10 are arranged along the moving direction of the size detecting plate 9 and detect the widthwise size of the recording paper arranged between the side guides.

【0027】トレイ後方に設けたバックフェンス50は
給紙方向へ進退可能に支持されており、画像形成装置側
に設けた図示しないセンサがトレイ内底部に設けた複数
の開口51を介してバックフェンス50の一部の移動位
置を検知することにより、バックフェンスの位置即ち記
録紙の給紙方向サイズを検知することができる。制御部
40は、こうして得られた積載された記録紙束の幅方向
寸法に関するデータと給紙方向寸法に関するデータに基
づいて積載された記録紙のサイズを判定する。なお、本
発明のトレイは上記ユニバーサルトレイに限定されるわ
けではなく、種々のタイプのトレイに対して適用可能で
ある。ただ、ユニバーサルトレイを用いれば、トレイ数
を増やすことなく種々の記録紙サイズに対応できる点で
有利となる。
A back fence 50 provided at the rear of the tray is supported so as to be able to advance and retreat in the paper feeding direction, and a sensor (not shown) provided on the image forming apparatus side is provided through a plurality of openings 51 provided at the bottom of the tray to provide the back fence. By detecting the moving position of a part of 50, the position of the back fence, that is, the size of the recording paper in the paper feed direction can be detected. The control unit 40 determines the size of the stacked recording sheets on the basis of the data on the widthwise dimension of the stacked recording sheet bundle and the data on the sheet feeding direction dimension thus obtained. The tray of the present invention is not limited to the above universal tray, but can be applied to various types of trays. However, the use of the universal tray is advantageous in that various recording paper sizes can be accommodated without increasing the number of trays.

【0028】なお、記録紙残量、記録紙サイズ等の得ら
れた情報は、不揮発性RAMに記憶させておくことによ
り、電源をOFFした場合においても残量等のデータは
記憶されているので、電源再投入した時に加圧アーム3
3をホームポジションに戻さてなくても、電源OFF時
の残量に応じた加圧力を得るための加圧レバーの回動角
度を知ることができるので、すぐに給紙スタートが可能
となる。
The obtained information such as the remaining amount of recording paper and the recording paper size is stored in the non-volatile RAM so that the data such as the remaining amount is stored even when the power is turned off. , Pressure arm 3 when power is turned on again
Even if 3 is not returned to the home position, it is possible to know the turning angle of the pressure lever for obtaining the pressing force according to the remaining amount when the power is off, so that the paper feeding can be started immediately.

【0029】図7は本発明装置の各部の動作手順を示す
フローチャートであり、画像形成装置の電源がONされ
ると、図6に示した手法によりトレイ内に積載された記
録紙のサイズが検知され、続いて押圧レバー18が加圧
状態にない場合には加圧モータ38をONして底板上の
記録紙が給紙ローラ5に圧接し上限検知センサが検知信
号を出力するまで加圧モータを駆動する(ステップ10
0〜104)。ステップ101においてすでに加圧状態
にある時にはステップ105に進む。
FIG. 7 is a flow chart showing the operation procedure of each part of the apparatus of the present invention. When the power of the image forming apparatus is turned on, the size of the recording paper loaded in the tray is detected by the method shown in FIG. Then, when the pressing lever 18 is not in the pressed state, the pressing motor 38 is turned on until the recording sheet on the bottom plate is pressed against the sheet feeding roller 5 and the upper limit detection sensor outputs a detection signal. Drive (step 10
0-104). When the pressure is already applied in step 101, the process proceeds to step 105.

【0030】ステップ105では、図5に示したデータ
テーブルに基づいて記録紙サイズ及び残量に応じた最適
の給紙圧を得るための加圧モータ駆動量について判定
し、必要に応じて正転、或は逆転を行わせる(ステップ
106〜111)。
In step 105, the driving amount of the pressurizing motor for obtaining the optimum paper feeding pressure according to the recording paper size and the remaining amount is judged based on the data table shown in FIG. , Or reverse rotation is performed (steps 106 to 111).

【0031】以上のように本発明によれば、記録紙残量
と記録紙サイズに関するデータに基づいて給紙圧調整機
構30を作動させて給紙圧が一定に保持されるように底
板昇降機構15による底板押上げ力を調整しているの
で、図9に示したように給紙可能領域が最大限に広が
り、重送、不送り発生の防止と、フリクションローラ部
のトルクを低減させることによる給紙負荷の低減を実現
できる。
As described above, according to the present invention, the bottom plate elevating mechanism is operated so that the paper feed pressure adjusting mechanism 30 is operated based on the data relating to the recording paper remaining amount and the recording paper size to keep the paper feeding pressure constant. Since the bottom plate pushing-up force by 15 is adjusted, as shown in FIG. 9, the paper feedable area is maximized to prevent the occurrence of double feeding and non-feeding and reduce the torque of the friction roller portion. The paper feed load can be reduced.

【0032】また、エンコーダとフォトインタラプタ等
から成るセンサにより加圧アーム33(押圧レバー1
8)がホームポジションから記録紙上限位置まで変位す
る量を検知しているので、精度良く記録紙残量を検知す
ることができる。また、不揮発性RAMに電源OFF時
の記録紙残量(エンコーダの位置)を記憶させておくこ
とにより、電源がOFFしたとしても電源再投入時に加
圧アーム(押圧レバー18)を一旦ホームポジションに
戻すことなく速やかに給紙スタート位置に移動し、給紙
スタートを行うことができる。
Further, the pressure arm 33 (press lever 1 is controlled by a sensor including an encoder and a photo interrupter.
Since 8) detects the amount of displacement from the home position to the upper limit position of the recording paper, it is possible to accurately detect the remaining amount of the recording paper. In addition, by storing the remaining amount of recording paper (position of the encoder) when the power is turned off in the nonvolatile RAM, even if the power is turned off, the pressure arm (pressing lever 18) is temporarily set to the home position when the power is turned on again. It is possible to promptly move to the paper feed start position without returning and start the paper feed.

【0033】[0033]

【発明の効果】以上のように本発明によれば、記録紙と
給紙ローラとの間の圧接力、即ち給紙圧を一定に保持す
るよう制御することにより、重送、不送り等の給紙不良
の発生を大幅に低減できる。
As described above, according to the present invention, by controlling the pressure contact force between the recording paper and the paper feed roller, that is, the paper feed pressure to be kept constant, double feeding, non-feeding, etc. The occurrence of paper feed defects can be greatly reduced.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例の概略構成を示す縦断面図で
あり、(a) は押圧レバーが底板を加圧していない状態を
示し、(b) は加圧している状態を示している。
FIG. 1 is a vertical cross-sectional view showing a schematic configuration of an embodiment of the present invention, (a) shows a state where a pressure lever does not press a bottom plate, and (b) shows a state where it presses. There is.

【図2】図1(b) の状態を示す斜視図である。FIG. 2 is a perspective view showing the state of FIG. 1 (b).

【図3】制御系を示すブロック図である。FIG. 3 is a block diagram showing a control system.

【図4】(a) はエンコーダ及びセンサの構成説明図、
(b) はセンサのON、OFFとエンコーダの位置との関
係を示す図である。
FIG. 4 (a) is an explanatory diagram of a configuration of an encoder and a sensor,
(b) is a diagram showing the relationship between ON / OFF of the sensor and the position of the encoder.

【図5】記録紙サイズと記録紙残量に基づく加圧モータ
の制御データを示すテーブルである。
FIG. 5 is a table showing control data of a pressure motor based on a recording paper size and a recording paper remaining amount.

【図6】ユニバーサルトレイの一例を示す斜視図であ
る。
FIG. 6 is a perspective view showing an example of a universal tray.

【図7】本発明装置の各部の動作手順を示すフローチャ
ートである。
FIG. 7 is a flowchart showing an operation procedure of each unit of the device of the present invention.

【図8】給紙圧と記録紙残量との関係を示す図である。FIG. 8 is a diagram showing a relationship between a paper feeding pressure and a recording paper remaining amount.

【図9】(a) 及び(b) は給紙条件を説明する図である。9A and 9B are diagrams illustrating sheet feeding conditions.

【図10】給紙圧の違いによる給紙可能領域の変動状態
を示す図である。
FIG. 10 is a diagram showing a change state of a paper feedable area due to a difference in paper feed pressure.

【符号の説明】[Explanation of symbols]

1 トレイ、2 支点、3 底板、5 給紙コロ、7
開口部、9 サイズ検知板、10 センサ(フォトイン
タラプタ)、15 底板昇降機構、16 軸、18 押
圧レバー、20 スプリング、21 押圧アーム、22
第1のエンコーダ、23 スリット、24 センサ、
30 給紙圧調整機構、31 軸、33 加圧アーム、
34 第2のエンコーダ、35 スリット、36セン
サ、37 従動ギヤ、38 加圧モータ(DCモー
タ)、40 制御部、45a,45b サイドガイド、
50 バックフェンス、51 開口、
1 tray, 2 fulcrums, 3 bottom plate, 5 paper feed rollers, 7
Opening part, 9 size detection plate, 10 sensor (photo interrupter), 15 bottom plate lifting mechanism, 16 axis, 18 pressing lever, 20 spring, 21 pressing arm, 22
First encoder, 23 slits, 24 sensor,
30 paper feed pressure adjusting mechanism, 31 axis, 33 pressure arm,
34 second encoder, 35 slit, 36 sensor, 37 driven gear, 38 pressure motor (DC motor), 40 control unit, 45a, 45b side guide,
50 back fence, 51 opening,

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 装置本体側に回転自在に軸支された給紙
ローラに対してトレイの底板上の記録紙の上面を圧接さ
せるために該底板を押し上げる押圧レバーを備えた底板
昇降機構と、該押圧レバーの移動量から記録紙の残量を
検知する記録紙残量検知手段と、該底板昇降機構による
底板押し上げ力を調整する給紙圧調整機構と、該底板上
に積載された記録紙サイズを検知する記録紙サイズ検知
手段と、上記各構成要素の動作を制御する制御部とを備
え、 前記制御部は、前記記録紙残量検知手段により検出され
た記録紙残量に関するデータと、前記記録紙サイズ検知
手段によって検出された記録紙サイズに関するデータと
に基づいて、前記給紙圧調整機構を制御することにより
給紙ローラによる給紙圧を所定に調節するようにしたこ
とを特徴とする給紙加圧装置。
1. A bottom plate elevating mechanism including a pressing lever that pushes up the bottom plate of the tray so as to press the upper surface of the recording paper on the bottom plate of the tray against a paper feed roller rotatably supported on the apparatus main body side. A recording paper remaining amount detecting means for detecting the remaining amount of recording paper from the moving amount of the pressing lever, a paper feed pressure adjusting mechanism for adjusting the bottom plate lifting force by the bottom plate lifting mechanism, and a recording paper stacked on the bottom plate. A recording paper size detection unit that detects a size, and a control unit that controls the operation of each of the above components, the control unit, the data regarding the recording paper remaining amount detected by the recording paper remaining amount detection unit, The paper feed pressure by the paper feed roller is adjusted to a predetermined value by controlling the paper feed pressure adjusting mechanism based on the data regarding the recording paper size detected by the recording paper size detecting means. You Sheet feeding pressure device.
【請求項2】 前記記録紙残量検知手段は、前記押圧レ
バーの変位量を検知するフォトセンサとエンコーダとか
ら成り、前記制御部は、該記録紙残量検知手段により検
知された記録紙残量に関するデータを不揮発性RAMに
記憶させることを特徴とする給紙加圧装置。
2. The recording paper remaining amount detecting means includes a photosensor and an encoder for detecting the displacement amount of the pressing lever, and the control section is configured to detect the recording paper remaining amount detected by the recording paper remaining amount detecting means. A paper feeding and pressurizing device characterized in that data relating to an amount is stored in a non-volatile RAM.
【請求項3】 前記給紙加圧装置を摩擦分離給紙方式の
給紙装置に適用したことを特徴とする請求項1又は2記
載の給紙加圧装置。
3. The paper feeding pressure device according to claim 1 or 2, wherein the paper feeding pressure device is applied to a friction separation paper feeding type paper feeding device.
【請求項4】 前記給紙加圧装置をユニバーサルトレイ
に適用したことを特徴とする請求項1又は2記載の給紙
加圧装置。
4. The paper feeding / pressurizing device according to claim 1, wherein the paper feeding / pressurizing device is applied to a universal tray.
JP4061067A 1992-02-17 1992-02-17 Device for feeding and pressing paper Pending JPH05229674A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4061067A JPH05229674A (en) 1992-02-17 1992-02-17 Device for feeding and pressing paper

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4061067A JPH05229674A (en) 1992-02-17 1992-02-17 Device for feeding and pressing paper

Publications (1)

Publication Number Publication Date
JPH05229674A true JPH05229674A (en) 1993-09-07

Family

ID=13160437

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4061067A Pending JPH05229674A (en) 1992-02-17 1992-02-17 Device for feeding and pressing paper

Country Status (1)

Country Link
JP (1) JPH05229674A (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH115639A (en) * 1997-04-17 1999-01-12 Oki Electric Ind Co Ltd Paper sheet handling device
EP1024411A2 (en) * 1999-01-26 2000-08-02 Samsung Electronics Co., Ltd. Method of detecting amount of remaining sheets of paper
US6783126B2 (en) 2001-12-20 2004-08-31 Fuji Xerox Co., Ltd. Sheet feeder and image formation apparatus
US7240899B2 (en) 2003-05-09 2007-07-10 Fuji Xerox Co., Ltd. Sheet feeding device and sheet processing apparatus
KR100821473B1 (en) * 2002-01-11 2008-04-10 한국후지제록스 주식회사 Automatic Up/Down Device of Bottom Plate for Paper Cassette
JP2009078872A (en) * 2007-09-25 2009-04-16 Kyocera Mita Corp Paper feeding cassette and image forming device provided therewith
JP2009249124A (en) * 2008-04-08 2009-10-29 Ricoh Co Ltd Feeding device and image forming device
US7643762B2 (en) * 2005-12-20 2010-01-05 Kyocera Mita Corporation Sheet remainder detecting device and image forming apparatus
JP2010037035A (en) * 2008-08-04 2010-02-18 Kyocera Mita Corp Sheet feeding device and image forming device with the same
JP2011148604A (en) * 2010-01-22 2011-08-04 Canon Inc Sheet feeder and image forming apparatus
JP2012121685A (en) * 2010-12-08 2012-06-28 Canon Inc Sheet feeding device, and image forming apparatus
US20130243448A1 (en) * 2012-03-19 2013-09-19 Shinya Naoi Image forming apparatus
KR101456707B1 (en) * 2007-12-12 2014-10-31 주식회사 엘지씨엔에스 Media thickness detecting apparatus
KR20160007808A (en) * 2014-06-30 2016-01-21 주식회사 엘지씨엔에스 Detecting apparatus of thickness and financial apparatus
US10053313B2 (en) 2016-10-18 2018-08-21 Kyocera Document Solutions Inc. Image forming apparatus

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH115639A (en) * 1997-04-17 1999-01-12 Oki Electric Ind Co Ltd Paper sheet handling device
EP1024411A2 (en) * 1999-01-26 2000-08-02 Samsung Electronics Co., Ltd. Method of detecting amount of remaining sheets of paper
EP1024411A3 (en) * 1999-01-26 2001-11-21 Samsung Electronics Co., Ltd. Method of detecting amount of remaining sheets of paper
US6783126B2 (en) 2001-12-20 2004-08-31 Fuji Xerox Co., Ltd. Sheet feeder and image formation apparatus
KR100821473B1 (en) * 2002-01-11 2008-04-10 한국후지제록스 주식회사 Automatic Up/Down Device of Bottom Plate for Paper Cassette
US7240899B2 (en) 2003-05-09 2007-07-10 Fuji Xerox Co., Ltd. Sheet feeding device and sheet processing apparatus
US7643762B2 (en) * 2005-12-20 2010-01-05 Kyocera Mita Corporation Sheet remainder detecting device and image forming apparatus
JP2009078872A (en) * 2007-09-25 2009-04-16 Kyocera Mita Corp Paper feeding cassette and image forming device provided therewith
KR101456707B1 (en) * 2007-12-12 2014-10-31 주식회사 엘지씨엔에스 Media thickness detecting apparatus
JP2009249124A (en) * 2008-04-08 2009-10-29 Ricoh Co Ltd Feeding device and image forming device
JP2010037035A (en) * 2008-08-04 2010-02-18 Kyocera Mita Corp Sheet feeding device and image forming device with the same
JP2011148604A (en) * 2010-01-22 2011-08-04 Canon Inc Sheet feeder and image forming apparatus
JP2012121685A (en) * 2010-12-08 2012-06-28 Canon Inc Sheet feeding device, and image forming apparatus
US20130243448A1 (en) * 2012-03-19 2013-09-19 Shinya Naoi Image forming apparatus
US8929799B2 (en) * 2012-03-19 2015-01-06 Konica Minolta, Inc. Image forming apparatus
KR20160007808A (en) * 2014-06-30 2016-01-21 주식회사 엘지씨엔에스 Detecting apparatus of thickness and financial apparatus
US10053313B2 (en) 2016-10-18 2018-08-21 Kyocera Document Solutions Inc. Image forming apparatus

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