JPH0853238A - Paper feeder of image recording apparatus - Google Patents
Paper feeder of image recording apparatusInfo
- Publication number
- JPH0853238A JPH0853238A JP18735294A JP18735294A JPH0853238A JP H0853238 A JPH0853238 A JP H0853238A JP 18735294 A JP18735294 A JP 18735294A JP 18735294 A JP18735294 A JP 18735294A JP H0853238 A JPH0853238 A JP H0853238A
- Authority
- JP
- Japan
- Prior art keywords
- roller
- paper feed
- paper
- recording paper
- recording
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Handling Of Cut Paper (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、給紙機構を有する複
写機や、プリンター等の画像記録装置の給紙装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device of an image recording apparatus such as a copying machine or a printer having a sheet feeding mechanism.
【０００２】[0002]
【従来の技術】上記画像記録装置においては、給紙カセ
ット等の多数枚シート状記録紙を収納した給紙収容部か
ら記録材としての記録紙を１枚ずつ給送して、画像形成
手段により露光・現像・転写工程を経て記録紙上に記録
画像が形成される。2. Description of the Related Art In the above-mentioned image recording apparatus, recording papers as recording materials are fed one by one from a paper feed accommodating portion for accommodating a large number of sheet-like recording papers such as a paper feed cassette, and the image forming means is used. A recording image is formed on the recording paper through the steps of exposure, development and transfer.
【０００３】上記露光・現像工程により感光体ドラム上
にトナー像が形成されるが、転写工程でこのトナー像を
感光体ドラムから記録紙上の所定位置に転写させるた
め、給紙カセットから給送された記録紙は感光体ドラム
近傍の転写部に至る給紙経路の途中に設けられたレジス
ト部で一時待機させられる。その後、画像形成制御部よ
り出力される制御信号によりトナー像が記録紙の所定位
置に転写されるようにタイミングを合わせて記録紙はレ
ジスト部から転写部に給送される。A toner image is formed on the photosensitive drum by the above-mentioned exposure / developing process. In order to transfer this toner image from the photosensitive drum to a predetermined position on the recording paper in the transfer process, it is fed from a paper feed cassette. The recording sheet is temporarily held by a registration section provided in the middle of a sheet feeding path to the transfer section near the photosensitive drum. After that, the recording paper is fed from the registration unit to the transfer unit at the same timing so that the toner image is transferred to a predetermined position of the recording paper by a control signal output from the image formation control unit.
【０００４】このため、従来はレジスト部のレジストロ
ーラ、および給紙カセットからレジスト部に至る給紙経
路に設けられる中間給紙ローラのそれぞれに電磁クラッ
チを取付け、この電磁クラッチを「断」「続」制御して
レジストローラおよび中間給紙ローラを「停止」「回
転」させて記録紙の給紙タイミングを制御していた。し
たがって、この装置では複数の電磁クラッチを使用する
ため複雑な装置構成と制御が必要であった。Therefore, conventionally, an electromagnetic clutch is attached to each of the registration roller of the registration unit and the intermediate paper feeding roller provided in the paper feeding path from the paper feeding cassette to the registration unit, and the electromagnetic clutch is "disengaged" and "continued". The recording paper feed timing was controlled by "stopping" and "rotating" the registration roller and the intermediate paper feed roller by controlling. Therefore, this device requires a complicated device configuration and control because a plurality of electromagnetic clutches are used.
【０００５】これに対し、本出願人によりレジスト部を
レジストローラおよびレジストシャッター部材で構成す
る給紙装置が開発されている。この給紙装置では、レジ
ストシャッター部材は画像形成制御部よりの制御信号に
応じてレジスト部を開閉するゲート部材として作動す
る。レジスト部「閉」時はレジストシャッター部材は記
録紙の先端に当接して記録紙を停止させて待機状態とす
る。レジスト部「開」時はレジストシャッター部材は記
録紙の先端から退避するので記録紙は待機状態を解除さ
れ記録紙はレジスト部から転写部に給送される。On the other hand, the present applicant has developed a sheet feeding device in which the resist portion is composed of a resist roller and a resist shutter member. In this paper feeding device, the resist shutter member operates as a gate member that opens and closes the resist unit in response to a control signal from the image formation control unit. When the registration portion is "closed", the registration shutter member comes into contact with the leading edge of the recording paper to stop the recording paper and put it in a standby state. When the registration section is "open", the registration shutter member retracts from the leading edge of the recording sheet, so that the recording sheet is released from the standby state and the recording sheet is fed from the registration section to the transfer section.
【０００６】[0006]
【発明が解決しようとする課題】上記給紙装置では、レ
ジスト部の開閉にかかわらずレジストローラおよび中間
給紙ローラは常時回転するよう構成されている。このた
め先端がレジストシャッター部材に当接して停止し待機
状態にある記録紙にレジストローラおよび中間給紙ロー
ラの回転力が作用し、この回転力により記録紙が振動し
ていわゆる紙鳴きとよばれる異常振動音を発生する問題
があった。In the above-mentioned paper feeding device, the registration roller and the intermediate paper feeding roller are always rotated regardless of whether the registration portion is opened or closed. For this reason, the front end contacts the registration shutter member and stops, and the rotational force of the registration roller and the intermediate sheet feeding roller acts on the recording sheet in the standby state, and the rotational force vibrates the recording sheet, which is called so-called squeal. There was a problem of generating abnormal vibration noise.
【０００７】この発明は、レジストローラおよび中間給
紙ローラを簡易な構成とし、かつ紙鳴きとよばれる異常
振動音を防止することを目的とする。An object of the present invention is to make the registration roller and the intermediate paper feed roller simple in structure and to prevent abnormal vibration noise called paper squeal.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するこの
発明の画像記録装置の給紙装置は記録材収容体から記録
材を送り出す送り出しローラ、記録材を画像形成体近傍
の転写部に送り出すタイミングを制御するレジストシャ
ッター部材を有すレジスト給紙部、および送り出しロー
ラとレジスト給紙部の間に位置する中間搬送部を有し、
前記中間搬送部が常時回転する駆動ローラ、従動ロー
ラ、および該従動ローラを前記駆動ローラに押圧する押
圧部材を有し、前記従動ローラが該従動ローラと一体に
回転する軸、および該軸に取付けられた振動防止用の重
りを有す。A paper feeding device of an image recording apparatus of the present invention which achieves the above object, is a feed roller for feeding a recording material from a recording material container, and a timing for feeding the recording material to a transfer section near the image forming body. A resist sheet feeding unit having a resist shutter member for controlling the sheet, and an intermediate conveyance unit located between the delivery roller and the resist sheet feeding unit,
The intermediate conveyance unit has a drive roller that constantly rotates, a driven roller, and a pressing member that presses the driven roller against the drive roller, and the driven roller rotates integrally with the driven roller, and the shaft is attached to the shaft. It has a built-in anti-vibration weight.
【０００９】[0009]
【作用】紙鳴きとよばれる記録紙の異常振動音発生の原
因を調べた結果、駆動ローラと記録材の間のスリップを
振動源として従動ローラおよび従動ローラを支持する軸
受け部が共振する現象であることが判った。As a result of investigating the cause of the abnormal vibration sound of the recording paper, which is called paper squeal, it is found that the slip between the driving roller and the recording material is a vibration source and the driven roller and the bearing portion supporting the driven roller resonate. I knew it was.
【００１０】この現象を防止するため特殊な材質のロー
ラを使用したり、搬送力を低下させることが考えられた
が、前者においては価格が高くなりまた部品管理が煩雑
となった。他方、後者においては厚紙記録紙やOHPシー
トを使用する場合、搬送不良が発生した。In order to prevent this phenomenon, it has been considered that a roller made of a special material is used or the carrying force is lowered, but in the former case, the price becomes high and the parts management becomes complicated. On the other hand, in the latter case, conveyance failure occurred when using thick recording paper or OHP sheet.
【００１１】これに対し本発明においては上述の振動防
止用の重りを有す中間搬送部の構成により記録紙の異常
振動音を防止するとともに厚紙記録紙やOHPシートを搬
送するに充分な搬送力を確保することにより給送信頼性
も向上することができた。On the other hand, in the present invention, the construction of the intermediate conveying section having the above-mentioned vibration-preventing weight prevents abnormal vibration noise of the recording paper and also has a sufficient conveying force for conveying the thick recording paper or the OHP sheet. As a result, the reliability of feeding could be improved.
【００１２】[0012]
【実施例】以下、本発明を図面に基づいて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.
【００１３】図１はこの発明に係る給紙装置を備えた画
像記録装置（カラープリンター）の側断面図である。図
において画像記録装置の下部枠体１Ａ内には記録紙Ｐを
複数枚内蔵した給紙カセット３が着脱自在に設けられて
いる。給紙カセット３上には記録紙Ｐを給紙する半月状
の給紙ローラ２が設けられ、給紙カセット３内には記録
紙Ｐを後述する分離爪５に押しつける押上板４が設けら
れている。前記記録紙Ｐは給紙カセット３内より給紙ロ
ーラ２と分離爪５により１枚づつ分離されて給紙され
る。下部枠体１Ａには更に記録紙Ｐの中間給紙ローラ６
が設けられ、給紙ローラ２で給紙された記録紙Ｐを上方
に給送する。該中間給紙ローラ６は給紙カセット３と湾
曲した反転案内板7Bとの間に設けられている。FIG. 1 is a side sectional view of an image recording apparatus (color printer) equipped with a sheet feeding device according to the present invention. In the figure, a paper feed cassette 3 containing a plurality of recording sheets P is detachably provided in the lower frame 1A of the image recording apparatus. A half-moon-shaped sheet feeding roller 2 for feeding the recording sheet P is provided on the sheet feeding cassette 3, and a push-up plate 4 for pushing the recording sheet P against a separating claw 5 described later is provided in the sheet feeding cassette 3. There is. The recording paper P is separated and fed from the paper feed cassette 3 one by one by the paper feed roller 2 and the separation claw 5. The lower frame 1A further includes an intermediate paper feed roller 6 for the recording paper P.
Is provided, and the recording paper P fed by the paper feed roller 2 is fed upward. The intermediate paper feed roller 6 is provided between the paper feed cassette 3 and the curved reverse guide plate 7B.
【００１４】反転案内板7Bに続く案内板7Cにより、反転
された記録紙Ｐはレジストローラ９に案内される。該レ
ジストローラ９の給紙上流側には用紙先端検出センサ８
が、給紙下流側には画像形成制御部よりの制御信号に応
じてレジスト部を開閉するゲート部材として作動するレ
ジストシャッター部材9Aがそれぞれ設けてある。案内板
10はレジストローラ９を通過した記録紙Ｐを転写ベルト
11方向に案内する。前記転写ベルト11は圧接ローラ12と
駆動ローラ13Aおよびローラ群13B，13Ｃに懸架されてい
る。定着装置15は記録紙Ｐ上に転写された像を定着する
装置で、定着用加熱ローラと圧着ローラ等よりなる。排
紙ローラ16は定着装置15より記録紙Ｐを排出し、排出さ
れた記録紙Ｐは記録紙案内部材17と、案内搬送ローラ18
とにより上方に搬送される。上記搬送ローラ18により上
方に搬送された記録紙Ｐは、上部枠体１Ｂに形成された
案内通路20及び排紙ローラ21により上部枠体１Ｂ上部の
ほぼ全面に設けられた排紙トレー22上に記録紙Ｐが記録
面下向きに排紙される。The reversed recording sheet P is guided to the registration rollers 9 by the guide plate 7C following the reverse guide plate 7B. A paper edge detection sensor 8 is provided upstream of the registration roller 9 in the paper feed direction.
However, a resist shutter member 9A that operates as a gate member that opens and closes the resist unit in response to a control signal from the image formation control unit is provided on the downstream side of the paper feed. information
10 is a transfer belt for transferring the recording paper P passing through the registration roller 9.
Guide in 11 directions. The transfer belt 11 is suspended around a pressure contact roller 12, a drive roller 13A, and roller groups 13B and 13C. The fixing device 15 is a device for fixing the image transferred on the recording paper P, and includes a fixing heating roller and a pressure roller. The paper discharge roller 16 discharges the recording paper P from the fixing device 15, and the discharged recording paper P is a recording paper guide member 17 and a guide conveyance roller 18.
And are transported upward by. The recording paper P conveyed upward by the conveying rollers 18 is placed on a guide passage 20 formed in the upper frame 1B and a paper discharge tray 22 provided almost entirely over the upper frame 1B by the paper discharge rollers 21. The recording paper P is discharged downward on the recording surface.
【００１５】次に、上部枠体１Ｂのほぼ中央部には、画
像形成用の感光体ドラム30が駆動回転可能に設けられ、
該感光体ドラム30の周面に沿って、回転上流側より、帯
電電極31、レーザ露光走査装置32、各色カラー現像剤を
収容する４組の現像装置33Ｙ，33Ｍ，33Ｃ，33Ｋ、前記
転写ベルト11および転写電極14等より成る転写手段、記
録紙Ｐに画像を転写したのち感光体ドラム30面に付着し
ている残留トナーを除去するクリーニング装置34が順次
配置されている。Next, a photoconductor drum 30 for image formation is rotatably provided at a substantially central portion of the upper frame 1B.
Along the peripheral surface of the photosensitive drum 30, from the upstream side of rotation, a charging electrode 31, a laser exposure scanning device 32, four sets of developing devices 33Y, 33M, 33C, 33K for accommodating color developers of each color, and the transfer belt. A transfer device including a transfer electrode 11 and a transfer electrode 14, and a cleaning device 34 for removing the residual toner adhering to the surface of the photosensitive drum 30 after transferring the image onto the recording paper P are sequentially arranged.
【００１６】上部枠体１Ｂの一部に固定されたトナー補
給装置35から前記現像装置33Ｙ，33Ｍ，33Ｃ，33Ｋにそ
れぞれカラートナー及び黒色トナーが供給される。図示
されたトナー補給装置35は一組のみであるが４組並置し
て設け、前記現像装置33Ｙ，33Ｍ，33Ｃ，33Ｋに例えば
シアン、マゼンタ、イエロー、黒色のトナーを供給し、
カラー現像及び黒色現像を行なうように構成している。
上部枠体１Ｂの一部を開放し得るようにした開閉蓋36か
ら前記トナー補給装置35に、外部よりそれぞれの新規カ
ラートナーが補給される。Color toner and black toner are supplied to the developing devices 33Y, 33M, 33C and 33K from the toner replenishing device 35 fixed to a part of the upper frame 1B. The illustrated toner replenishing device 35 is provided only in one set, but four sets are provided side by side, and for example, cyan, magenta, yellow and black toners are supplied to the developing devices 33Y, 33M, 33C and 33K.
It is configured to perform color development and black development.
Each new color toner is replenished from the outside to the toner replenishing device 35 from the opening / closing lid 36 which can open a part of the upper frame 1B.
【００１７】前記上部枠体１Ｂは、支軸１Ｃを中心に記
録紙Ｐの搬送経路を開放できるように構成されており、
記録紙Ｐが給紙搬送中、不良搬送状態となり、記録紙Ｐ
が少なくとも定着装置15まで達しない場合には上部枠体
１Ｂを支軸１Ｃを中心に開放し、記録紙Ｐを取り出すこ
とができる。The upper frame 1B is constructed so that the conveyance path of the recording paper P can be opened around the support shaft 1C.
While the recording paper P is being fed and conveyed, the recording paper P is in a defective conveyance state.
When at least the fixing device 15 is not reached, the upper frame 1B can be opened around the support shaft 1C and the recording paper P can be taken out.
【００１８】図２は給送部駆動系統図である。図中、動
力源である主モーター50より、半月状の給紙ローラ２、
駆動レジストローラ91および駆動中間給紙ローラ61に歯
付きプーリーおよび中間歯車郡を介して駆動力がそれぞ
れ伝達される。電磁クラッチ51により給紙ローラ２は間
欠的に駆動される。一方、駆動レジストローラ91および
駆動中間給紙ローラ61は常時駆動されて回転するよう構
成されている。FIG. 2 is a diagram of the feeding section drive system. In the figure, from the main motor 50, which is the power source, the half-moon shaped feeding roller 2,
The driving force is transmitted to the driving registration roller 91 and the driving intermediate paper feeding roller 61 via the toothed pulley and the intermediate gear group, respectively. The paper feed roller 2 is intermittently driven by the electromagnetic clutch 51. On the other hand, the drive registration roller 91 and the drive intermediate paper feed roller 61 are always driven and rotated.
【００１９】図３は図１における中間ローラ６および反
転案内板7Bよりなる中間搬送部の拡大断面図であり、図
４は駆動中間給紙ローラ61と従動中間給紙ローラ62の配
置を示す平面図である。FIG. 3 is an enlarged cross-sectional view of the intermediate conveying section comprising the intermediate roller 6 and the reversing guide plate 7B in FIG. 1, and FIG. 4 is a plan view showing the arrangement of the driving intermediate sheet feeding roller 61 and the driven intermediate sheet feeding roller 62. It is a figure.
【００２０】図３に示すごとく、一対の案内板71、72に
より反転案内板7Bは構成される。案内板72は案内板保持
部材64に固定されていて、案内板保持部材64を装置内の
所定位置に取付けることにより案内板72は案内板71に隣
接され、案内板71と案内板72との間に反転給紙経路が形
成される。As shown in FIG. 3, the inverted guide plate 7B is constituted by the pair of guide plates 71 and 72. The guide plate 72 is fixed to the guide plate holding member 64, and the guide plate 72 is adjacent to the guide plate 71 by mounting the guide plate holding member 64 at a predetermined position in the device. A reverse paper feed path is formed between them.
【００２１】駆動中間給紙ローラ61は反転給紙経路の案
内板71側に位置し、装置内に固定された軸受けにより回
転可能に支持されていて、前述したごとく中間歯車群を
介して主モーター50の駆動力が伝達される。The driving intermediate paper feed roller 61 is located on the guide plate 71 side of the reverse paper feed path and is rotatably supported by a bearing fixed in the apparatus. As described above, the main motor is driven via the intermediate gear group. A driving force of 50 is transmitted.
【００２２】従動中間給紙ローラ62は反転給紙経路の案
内板72側に位置し、弾性支持部材63を介して案内板保持
部材64に取付けられている。すなわち、図４に示すごと
く２個の従動中間給紙ローラ62は従動軸62Sに固定され
ていて、従動軸62Sは２個の軸受け65により回転可能に
支持されている。図３に示すごとく、軸受け65は弾性支
持部材63の自由端63Fに取付けられ、弾性支持部材63の
固定端63Gは案内板保持部材64に固定されている。この
構成により、従動中間給紙ローラ62、従動軸62Sおよび
軸受け65で構成される回転系は弾性支持部材63の固定端
63Gの回りに弾性的に変位可能に支持されている。図３
において、点線で示された弾性支持部材63の自由端63F
は弾性的に変位する前の位置を示す。上述した案内板72
が固定された案内板保持部材64を装置内の所定位置に取
付けることにより、従動中間給紙ローラ62は駆動中間給
紙ローラ61に当接し、弾性支持部材63の自由端63Fは実
線で示す位置まで弾性的に変位する。この弾性支持部材
63の変位により従動中間給紙ローラ62は駆動中間給紙ロ
ーラ61に圧接される。The driven intermediate paper feed roller 62 is located on the guide plate 72 side of the reverse paper feed path, and is attached to the guide plate holding member 64 via the elastic support member 63. That is, as shown in FIG. 4, the two driven intermediate sheet feeding rollers 62 are fixed to the driven shaft 62S, and the driven shaft 62S is rotatably supported by the two bearings 65. As shown in FIG. 3, the bearing 65 is attached to the free end 63F of the elastic support member 63, and the fixed end 63G of the elastic support member 63 is fixed to the guide plate holding member 64. With this configuration, the rotation system including the driven intermediate paper feed roller 62, the driven shaft 62S, and the bearing 65 is a fixed end of the elastic support member 63.
It is supported so as to be elastically displaceable around 63G. FIG.
, The free end 63F of the elastic support member 63 indicated by the dotted line
Indicates the position before elastically displacing. Guide plate 72 described above
By attaching the guide plate holding member 64 fixed to the driven intermediate paper feeding roller 62 to the driving intermediate paper feeding roller 61, the free end 63F of the elastic supporting member 63 is shown by the solid line. Displaces elastically up to. This elastic support member
Due to the displacement of 63, the driven intermediate sheet feeding roller 62 is pressed against the driving intermediate sheet feeding roller 61.
【００２３】このように、案内板保持部材64を装置内の
所定位置に取付けることにより、案内板71と案内板72の
間に反転給紙経路が形成されると共に従動中間給紙ロー
ラ62は駆動中間給紙ローラ61に圧接され中間給紙部が形
成される。従動中間給紙ローラ62は駆動中間給紙ローラ
61に圧接されることにより回転し、圧接力に応じて従動
中間給紙ローラ62と駆動中間給紙ローラ61との間に搬送
力が生じ、この搬送力により記録紙Ｐは反転給紙経路か
らレジスト部に搬送される。As described above, by mounting the guide plate holding member 64 at a predetermined position in the apparatus, a reverse paper feed path is formed between the guide plates 71 and 72, and the driven intermediate paper feed roller 62 is driven. The intermediate paper feed roller 61 is pressed against the intermediate paper feed roller 61 to form an intermediate paper feed unit. The driven intermediate sheet feeding roller 62 is a driving intermediate sheet feeding roller.
When the recording paper P is rotated by being pressed against the 61, a conveying force is generated between the driven intermediate paper feeding roller 62 and the driving intermediate paper feeding roller 61 in accordance with the pressing force, and the conveying force causes the recording paper P to flow from the reverse paper feeding path. It is transported to the resist section.
【００２４】図４の実施例では、重り66は弾性支持部材
63を中心として左右対称に３分割されて従動軸62S上に
回転自在に取付けられている。この重り66により従動中
間給紙ローラ62と従動軸62Sよりなる回転系の慣性力を
増加するよう構成されている。重り66は従動軸62S上に
固定して取付けることもできるが、振動応答性を考慮す
ると回転自在に取付ける方がより効果的である。また、
組立性の面からも回転自在に取付ける方が好ましい。In the embodiment of FIG. 4, the weight 66 is an elastic support member.
It is symmetrically divided into three parts centered on 63 and mounted rotatably on the driven shaft 62S. The weight 66 is configured to increase the inertial force of the rotary system including the driven intermediate paper feed roller 62 and the driven shaft 62S. The weight 66 can be fixedly mounted on the driven shaft 62S, but it is more effective to mount the weight rotatably in consideration of vibration response. Also,
From the standpoint of assemblability, it is preferable to attach it rotatably.
【００２５】上述した本発明の給紙機構において使用さ
れる記録紙Ｐは標準的なコピー用紙に限定されず厚紙記
録紙やOHPシート等を使用することもできる。The recording paper P used in the above-described paper feeding mechanism of the present invention is not limited to standard copy paper, and thick paper recording paper or OHP sheet can be used.
【００２６】図５は圧接力に応じて従動中間給紙ローラ
62と駆動中間給紙ローラ61との間に生じる搬送力が種々
の紙質におよぼす影響を実験して調査した結果を示す図
である。図中、横軸は紙質を表し、Ａは16ポンド紙、Ｂ
は20ポンド紙、Ｃは28ポンド紙、Ｄは36ポンド紙、Ｅは
５ミルOHTを示す。縦軸は搬送力（gf）を表す。斜線部
はトラブルが認められた領域で、搬送力の弱い領域での
斜線部は搬送力不足のためレジストシャッター部材9A
「開」後の搬送に遅れが認められトナー像が記録紙の所
定の位置に転写されなかった。搬送力の強い領域での斜
線部は搬送力過大のためレジストシャッター部材9A
「閉」により待機中の記録紙に座屈によるシワが発生し
た。例えば、Ａの16ポンド紙の場合、搬送力約180（g
f）以下では搬送遅れが発生し、搬送力約600（gf）以上
ではシワが発生した。従って、搬送力約180（gf）から6
00（gf)の範囲がＡの16ポンド紙に対す適正搬送力の領
域である。FIG. 5 shows a driven intermediate sheet feeding roller according to the pressure contact force.
FIG. 11 is a diagram showing the results of an experimental investigation of the influence of the transport force generated between the drive roller 62 and the driving intermediate paper feed roller 61 on various paper qualities. In the figure, the horizontal axis represents paper quality, A is 16 pound paper, B
For 20 pound paper, C for 28 pound paper, D for 36 pound paper, E for 5 mil OHT. The vertical axis represents the carrying force (gf). The shaded area is the area where trouble was recognized, and the shaded area in the area where the conveying force is weak is the resist shutter member 9A due to insufficient conveying force.
The toner image was not transferred to a predetermined position on the recording paper due to a delay in the conveyance after "opening". The shaded area in the strong transport area is the resist shutter member 9A because the transport capacity is too large.
"Closed" caused buckling on the recording paper in standby. For example, in the case of 16 pound paper of A, the carrying force is about 180 (g
The conveyance delay occurred below f), and wrinkles occurred above the conveyance force of about 600 (gf). Therefore, the carrying force is about 180 (gf) to 6
The range of 00 (gf) is the area of proper carrying force for the 16-pound paper of A.
【００２７】図５に示すごとく、全ての紙質に対す適正
搬送力を考慮すると300（gf）から600（gf）の範囲に搬
送力を選定するのが好ましい。As shown in FIG. 5, it is preferable to select the carrying force in the range of 300 (gf) to 600 (gf) in consideration of the proper carrying force for all paper quality.
【００２８】図６は最も異常振動音を発生しやすい５ミ
ルOHTの記録紙を使用して行った給紙試験で得られた重
りの重量と異常振動音発生領域の関係を示す図である。
縦軸は中間給紙部の搬送力（gf）を示し、横軸は重りの
重量（gf）を示す。この図から、搬送力CF（gf）が強く
なるほど、異常振動音を防止するには重りの重量W（g
f）を増加する必要があり、具体的には重りの重量は Ｗ＞112−0.6CF＋CF2−−−−−（１）を満足すればよ
いことが判る。一方、搬送力が弱い場合は異常振動音を
防止するための重りの重量は軽くできるが、上述したよ
うに搬送力の弱い領域では搬送に遅れが発生するので、
この搬送遅れを防止するため適正な搬送力を確保しなけ
ればならず、この適正搬送力に応じて上記式（１）を満
足するように重りの重量を決定する必要がある。FIG. 6 is a diagram showing the relationship between the weight of the weight and the abnormal vibration sound generation area obtained in the paper feed test performed using the recording paper of 5 mil OHT which is most likely to generate the abnormal vibration sound.
The vertical axis represents the carrying force (gf) of the intermediate sheet feeding unit, and the horizontal axis represents the weight of the weight (gf). From this figure, as the carrying force CF (gf) becomes stronger, the weight of the weight W (g
It is necessary to increase f), and specifically, it is understood that the weight of the weight should satisfy W> 112-0.6CF + CF 2 ----- (1). On the other hand, when the conveying force is weak, the weight of the weight for preventing abnormal vibration noise can be reduced, but as described above, the conveyance is delayed in the region where the conveying force is weak.
In order to prevent this conveyance delay, it is necessary to secure a proper conveyance force, and it is necessary to determine the weight of the weight according to the proper conveyance force so as to satisfy the above formula (1).
【００２９】上述した本発明の給紙機構において、一例
として中間給紙部の搬送力を500（gf）とし、前記関係
式を満足するように重量25（gf）の防振重り66を従動軸
62Sに回転自在に取付けて給紙試験をおこなった。In the above-described sheet feeding mechanism of the present invention, as an example, the conveying force of the intermediate sheet feeding section is set to 500 (gf), and the anti-vibration weight 66 having a weight of 25 (gf) is attached to the driven shaft so as to satisfy the above relational expression.
The 62S was rotatably attached and a paper feed test was conducted.
【００３０】上述したように記録紙は給紙カセット３内
より給紙ローラ２と分離爪５により１枚づつ分離されて
中間給紙部に給紙され、さらに中間給紙部の中間給紙ロ
ーラ61、62により反転案内板7Bを経由してレジスト部に
搬送された。レジスト部で記録紙は、その先端がレジス
トシャッター部材9Aに当接して停止し待機状態とおかれ
た。この待機状態でもレジストローラ９及び中間給紙ロ
ーラ61、62の回転は継続され、その回転の影響を記録紙
はその前半部および後半部に受けてわずかに振動するの
が認められたが、弾性支持部材63により支持された従動
中間給紙ローラ62の回転系は重り66により慣性が付加さ
れているので共振現象は起こさず異常音は発生しなかっ
た。As described above, the recording papers are separated one by one from the paper feed cassette 3 by the paper feed roller 2 and the separation claw 5 and fed to the intermediate paper feed section, and further the intermediate paper feed roller of the intermediate paper feed section. The sheets 61, 62 were conveyed to the resist section via the reverse guide plate 7B. The recording sheet at the resist portion was stopped by contacting the leading edge of the recording paper with the resist shutter member 9A, and was left in a standby state. Even in this standby state, the registration roller 9 and the intermediate paper feed rollers 61 and 62 continue to rotate, and it is observed that the recording paper receives the influence of the rotation in the first half and the second half thereof and slightly vibrates. Since the rotation system of the driven intermediate sheet feeding roller 62 supported by the supporting member 63 has inertia added by the weight 66, no resonance phenomenon occurs and no abnormal sound is generated.
【００３１】その後、トナー画像形成とタイミングを合
わせてレジストシャッター部材9Aが記録紙先端より退避
しレジスト部「開」となると記録紙は搬送遅れを起こす
ことなく転写部に搬送され、その所定位置にトナー画像
が転写された。記録紙として上述したＡ、Ｂ、Ｃ、Ｄ、
およびＥをそれぞれ使用したが搬送遅れ、座屈および異
常音は発生することなく画像形成がおこなわれた。After that, when the registration shutter member 9A is retracted from the leading edge of the recording sheet and the registration section "opens" in synchronism with the toner image formation, the recording sheet is conveyed to the transfer section without causing a conveyance delay, and is moved to the predetermined position. The toner image is transferred. A, B, C, D described above as recording paper
Although E and E were used, images were formed without delaying conveyance, buckling and abnormal noise.
【００３２】重り66はレジストローラーに取付けること
もできるが、本実施例のように中間給紙ローラ６とレジ
ストローラー９の間に湾曲した反転給紙経路を形成する
場合は従動中間給紙ローラ62に取付けるのが好ましい。Although the weight 66 can be attached to the registration roller, when the curved reverse paper feed path is formed between the intermediate paper feed roller 6 and the registration roller 9 as in this embodiment, the driven intermediate paper feed roller 62 is used. It is preferable to attach it to.
【００３３】図７（ａ）および図７（ｂ）は中間給紙部
の他の実施例である。すなわち、図４の実施例では弾性
支持部材として板ばねを使用したが、本発明の弾性支持
部材は板ばねに限定されることなく、従動中間給紙ロー
ラ62の回転系を駆動中間給紙ローラ61に押圧する部材で
あれば適用できる。例えば、その一例としてに図７
（ａ）および図７（ｂ）に示すごとくコイルばね69を使
用することができる。板ばねとコイルばねを比較する
と、板ばねの方が適正な弾性力を保持しやすく、また変
位方向を制御しやすいので好ましい。FIGS. 7A and 7B show another embodiment of the intermediate sheet feeding section. That is, although the leaf spring is used as the elastic support member in the embodiment of FIG. 4, the elastic support member of the present invention is not limited to the leaf spring, and the rotation system of the driven intermediate paper feed roller 62 is driven by the intermediate paper feed roller. Any member that presses against 61 can be applied. For example, as an example thereof, FIG.
A coil spring 69 can be used as shown in FIGS. 7A and 7B. Comparing the leaf spring and the coil spring, the leaf spring is preferable because it is easy to maintain an appropriate elastic force and the displacement direction is easily controlled.
【００３４】[0034]
【発明の効果】上記のごとく構成したので次のような効
果を奏する。Since the above construction is employed, the following effects are obtained.
【００３５】上述したごとく、請求項１の効果は、中間
搬送部の従動中間給紙ローラが振動防止用の重りを有す
よう構成したから、記録紙の異常振動音を防止すること
ができた。また、請求項２の効果は、弾性支持部材によ
り軸受けを介して従動ローラを駆動ローラに押圧するよ
うにしたので、請求項１の効果に加え、中間給紙部が簡
易に構成できた。As described above, according to the first aspect of the invention, since the driven intermediate sheet feeding roller of the intermediate conveying section has the weight for preventing vibration, the abnormal vibration sound of the recording sheet can be prevented. . Further, the effect of claim 2 is that the driven roller is pressed against the drive roller via the bearing by the elastic support member. Therefore, in addition to the effect of claim 1, the intermediate paper feeding portion can be configured simply.
【００３６】さらに、請求項３の効果は、給紙搬走力の
範囲を規定したので、請求項１の効果に加え、厚紙記録
紙やOHPシートを搬送するに充分な搬送力を確保し給送
信頼性を向上することができた。Further, since the effect of claim 3 defines the range of the paper feeding and carrying force, in addition to the effect of claim 1, a feeding force sufficient to feed cardboard recording paper and OHP sheets is ensured. It was possible to improve the sending reliability.
【００３７】さらに、請求項４の効果は、給紙搬走力に
対する防振用重りの重量を規定したので記録紙の異常振
動音の防止がより確実となった。Further, according to the effect of claim 4, since the weight of the antivibration weight with respect to the feeding force of the paper feed is regulated, the abnormal vibration sound of the recording paper can be prevented more reliably.
【図１】この発明に係る給紙装置を備えた画像記録装置
の側断面図。FIG. 1 is a side sectional view of an image recording apparatus including a paper feeding device according to the present invention.
【図２】給送部駆動系統図。FIG. 2 is a diagram of a feeder drive system.
【図３】中間搬送部の拡大断面図。FIG. 3 is an enlarged sectional view of an intermediate conveyance section.
【図４】駆動中間給紙ローラ６１と従動中間給紙ローラ
６２の配置を示す平面図。FIG. 4 is a plan view showing an arrangement of a driving intermediate sheet feeding roller 61 and a driven intermediate sheet feeding roller 62.
【図５】搬送力が種々の紙質におよぼす影響を実験して
調査した結果を示す図。FIG. 5 is a diagram showing the results of an experimental investigation conducted on the influence of the carrying force on various paper qualities.
【図６】重りの重量と異常振動音発生領域の関係を示す
図。FIG. 6 is a diagram showing a relationship between a weight of a weight and an abnormal vibration sound generation region.
【図７】中間給紙部の他の実施例を示す図。FIG. 7 is a diagram showing another embodiment of the intermediate paper feeding unit.
１Ａ 下部枠体 １Ｂ 上部枠体 ９ レジストローラ 61 駆動中間給紙ローラ 62 従動中間給紙ローラ 63 弾性支持部材 64 案内板保持部材 65 軸受け 66 重り 1A Lower frame 1B Upper frame 9 Registration roller 61 Drive intermediate sheet feeding roller 62 Driven intermediate sheet feeding roller 63 Elastic support member 64 Guide plate holding member 65 Bearing 66 Weight
Claims (4)
出しローラ、記録材を画像形成体近傍の転写部に送り出
すレジスト給紙部、および送り出しローラとレジスト給
紙部の間に位置する中間搬送部を有し、前記中間搬送部
が常時回転する駆動ローラ、従動ローラ、および該従動
ローラを前記駆動ローラに押圧する押圧部材を有し、前
記従動ローラが該従動ローラと一体に回転する軸、およ
び該軸に取付けられた振動防止用の重りを有すように構
成された画像記録装置の給紙装置。1. A feeding roller for feeding a recording material from a recording material container, a resist paper feeding portion for feeding the recording material to a transfer portion near the image forming body, and an intermediate feeding portion located between the feeding roller and the resist paper feeding portion. And a shaft that has a drive roller that the intermediate conveyance section always rotates, a driven roller, and a pressing member that presses the driven roller against the drive roller, the driven roller rotating integrally with the driven roller, and A sheet feeding device of an image recording apparatus configured to have a vibration preventing weight attached to the shaft.
記従動ローラの軸受けが前記弾性支持部材により弾性的
に変位可能に支持され、前記弾性支持部材により前記軸
受けを介して前記従動ローラは前記駆動ローラに押圧さ
れている請求項１記載の画像記録装置の給紙装置。2. The pressing member is an elastic supporting member, a bearing of the driven roller is supported by the elastic supporting member so as to be elastically displaceable, and the driven roller is supported by the elastic supporting member via the bearing. The sheet feeding device of the image recording apparatus according to claim 1, wherein the sheet feeding device is pressed against the driving roller.
0（gf）以上、600（gf）以下である請求項１又は請求項
２記載の画像記録装置の給紙装置。3. The range of the paper feeding and conveying force of the intermediate conveying section is 18
The paper feeding device of the image recording apparatus according to claim 1, wherein the paper feeding device is 0 (gf) or more and 600 (gf) or less.
f）、中間搬送部の給紙搬送力をCF（gf）としたとき、
前記振動防止用の重りが下記式を満足する重量を有する
請求項１乃至請求項３のいずれか１項記載の画像記録装
置の給紙装置。 Ｗ＞112−0.6CF＋CF2 4. The weight of the vibration preventing weight is W (g
f), when the paper feeding and conveying force of the intermediate conveying section is CF (gf),
The sheet feeding device of the image recording apparatus according to claim 1, wherein the vibration preventing weight has a weight that satisfies the following formula. W> 112-0.6CF + CF 2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18735294A JP3215907B2 (en) | 1994-08-09 | 1994-08-09 | Paper feeder for image recording device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18735294A JP3215907B2 (en) | 1994-08-09 | 1994-08-09 | Paper feeder for image recording device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0853238A true JPH0853238A (en) | 1996-02-27 |
| JP3215907B2 JP3215907B2 (en) | 2001-10-09 |
Family
ID=16204495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18735294A Expired - Fee Related JP3215907B2 (en) | 1994-08-09 | 1994-08-09 | Paper feeder for image recording device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3215907B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006062873A (en) * | 2004-07-27 | 2006-03-09 | Canon Inc | Sheet feeder and image forming device |
| KR100739766B1 (en) * | 2005-12-02 | 2007-07-13 | 삼성전자주식회사 | Registration unit and Image forming apparatus adopting the same |
| JP2012135886A (en) * | 2010-12-24 | 2012-07-19 | Ricoh Co Ltd | Sheet ejection device, and stencil printing apparatus |
-
1994
- 1994-08-09 JP JP18735294A patent/JP3215907B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006062873A (en) * | 2004-07-27 | 2006-03-09 | Canon Inc | Sheet feeder and image forming device |
| KR100739766B1 (en) * | 2005-12-02 | 2007-07-13 | 삼성전자주식회사 | Registration unit and Image forming apparatus adopting the same |
| JP2012135886A (en) * | 2010-12-24 | 2012-07-19 | Ricoh Co Ltd | Sheet ejection device, and stencil printing apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3215907B2 (en) | 2001-10-09 |
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