JP2004262606A - Sheet feeder and image forming apparatus using the same - Google Patents

Sheet feeder and image forming apparatus using the same Download PDF

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Publication number
JP2004262606A
JP2004262606A JP2003055331A JP2003055331A JP2004262606A JP 2004262606 A JP2004262606 A JP 2004262606A JP 2003055331 A JP2003055331 A JP 2003055331A JP 2003055331 A JP2003055331 A JP 2003055331A JP 2004262606 A JP2004262606 A JP 2004262606A
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Japan
Prior art keywords
sheet
paper
bottom plate
storage unit
transfer
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JP2003055331A
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Japanese (ja)
Inventor
Chikashi Tanabe
史 田鍋
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Ricoh Co Ltd
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Ricoh Co Ltd
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Priority to JP2003055331A priority Critical patent/JP2004262606A/en
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  • Paper Feeding For Electrophotography (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To precisely detect a jam when paper is transferred and prevent damage of an apparatus in a sheet feeder capable of feeding the paper by arranging first and second paper housing portions nearly horizontally and in parallel and transferring a paper bundle. <P>SOLUTION: When it is detected that the paper P1 of the first paper housing portion 11 is consumed, a bottom plate 16 is lowered, end fences 23, 24 are retreated, a back fence 32 is moved in a direction of the first paper housing portion 11 and a bundle of paper P2 is moved from the second paper housing portion 12 to the first paper housing portion 11. When the paper bundle is transferred without a jam, a paper bundle detection sensor 28 detects the end bottom arrival of the bundle of the paper P2 almost as soon as a forcing sensor 40 detects completion of transfer action of the back fence 32. When a buckling jam is generated, the paper bundle detection sensor 28 cannot detect an end bottom portion of the paper bundle even if the forcing sensor 40 detects the completion of transfer action of the back fence 32. In that case, the jam is indicated. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、給紙装置と、これを用いた複写機、ファクシミリ、プリンタなどの画像形成装置に関する。
【0002】
【従来の技術】
従来、可動の底板上に複数枚の用紙を積載可能な第1用紙収容部、第1用紙収容部から用紙を1枚ずつ給紙するための給紙手段、第1用紙収容部と略水平かつ並列に配置し、複数枚の用紙を積載可能な第2用紙収容部、及び第2用紙収容部に積載した用紙を一括して第1用紙収容部へ移送する手段を有する給紙装置が知られている(例えば、特許文献1参照。)。
【0003】
この装置は、第2用紙収容部に積載した用紙を第1用紙収容部へ一括して移送する時のジャム検出を、用紙を移送する押圧板の位置を検出するホームポジションセンサと押圧板検知センサとの検知信号で行っており、多数枚の用紙束が移送中に引っ掛かった負荷力が、モータの定格トルクよりも大きい場合にモータの回転が停止しもしくは低速となり、押圧板検知センサの信号が無くなるか、あるいは遅延することでジャムを検知する。
【0004】
【特許文献1】
特許第2831458号(特開平04−179634公報)
【0005】
【発明が解決しようとする課題】
しかしながら、上記特許文献1の装置では、第2用紙収容部に積載した用紙の枚数が少ないときにジャムが発生する場合、移送中の用紙引っ掛かりの負荷力は移送モータの定格トルクよりも低く、小数枚の用紙束は座屈ジャムしていても押圧板の移動は完了となり押圧板検知センサの出力はジャムを検出できず、次の動作、すなわち用紙を給紙する動作に切り替わってしまう。そして用紙束が座屈した状態で第1用紙収容部の底板を上昇させると、底板もしくは上昇機構の破損事故となる。
【0006】
本発明は、上記従来の技術にかんがみ、用紙移送時のジャムを的確に検知し、装置の破損を防止することができる給紙装置及びこれを用いた画像形成装置を提供することを目的とする。
【0007】
【課題を解決するための手段】
本発明の請求項1に係る給紙装置は、上記目的を達成するために、可動の底板を有し、該底板上に複数枚の用紙を積載可能な第1用紙収容部と、該第1用紙収容部から用紙を1枚ずつ給紙するための給紙手段と、該第1用紙収容部と略水平かつ並列に配置し、複数枚の用紙を積載可能な第2用紙収容部と、該第2用紙収容部に積載した用紙を一括して上記第1用紙収容部へ移送する移送手段とを有する給紙装置において、上記第1用紙収容部の用紙を積載する可動の底板に少なくとも1個所の開口を形成し、上記第1用紙収容部へ移送する用紙束底部先端を検知する用紙束検知手段を上記少なくとも1箇所の開口にそれぞれ対応させて上記第1用紙収容部の底部に設け、かつ上記第1用紙収容部に収容した用紙を、上記底板を介して上記移送手段側へ付勢する底板加圧手段を設け、該底板加圧手段の付勢を上記第2用紙収容部内の用紙を上記第1用紙収容部へ移送する際に解除可能としてなることを特徴とする。
【0008】
同請求項2に係るものは、上記目的を達成するために、請求項1の給紙装置において、上記第1用紙収容部の可動の底板に設けた開口が、給紙動作中の用紙の有無を検知するペーパーエンド検知用の開口を兼ねることを特徴とする。
【0009】
同請求項3に係る画像形成装置は、上記目的を達成するために、請求項1また2の給紙装置を用い、上記移送手段による上記用紙の移送開始時間から該用紙束検知手段が用紙束底部先端を検知するまでの移送時間をカウントする手段と、該カウント手段がカウントした上記移送時間が所定時間を外れた場合に用紙移送中のジャムと判断する手段と、該判断手段の判断出力に応じて上記移送手段の移送動作を停止させると共に表示部ジャムメッセージを表示することを特徴とする。
【0010】
【発明の実施の形態】
以下、図面を参照して本発明の実施の形態を説明する。 図1は、本発明の第1実施例を適用した複写機の概略図を示す構成図である。図中1は原稿を載置するコンタクトガラス、2は原稿を照射して感光体3を露光する光学系、4は帯電器、5は現像器、6は転写・分離器、7はクリーニング部、8は定着部、9はレジストローラ対、10は大型サイズの用紙を収容する従来型のトレイである。また図中11は第1用紙収容部、12は第1用紙収容部11に対して水平且つ並列に配設した第2用紙収容部である。
【0011】
さらに、図中L1、L2は上段のトレイ17を引き出すときのガイドレール、13は従来型のトレイ10、あるいは第1用紙収容部11から選択されて給紙される用紙P1をレジストローラ対9まで搬送するための搬送手段、14は用紙の手差し給紙部、L3、L4は従来型のトレイ10を引き出すときに案内するガイドレール、15はピックアップローラ、フィードローラ及び分離ローラよりなる給紙手段、16は一端をトレイ17に係合している回転可能(上昇可能)な底板である。
【0012】
また図中18は加圧板で、複写機本体に固設した図示しない駆動部により回動可能でありかつトレイの穴17aを通って底板16と一端が当接する。また19は底板16上にある用紙P1のうち最上用紙の上限位置を制限するリミットスイッチ、20は加圧板18がトレイの穴17aと接しない位置まで下降したことを検知する下降検知センサである。
【0013】
上述のように従来型のトレイ10、第1用紙収容部11、第2用紙収容部12からなる給紙部は、上段aと下段bの2段給紙型となっており、上段a側に本発明に係る給紙装置の実施形態、すなわちA4等のハーフサイズの用紙を2束収容可能なトレイ17を配設し、下段b側に例えばA3などの大サイズの用紙を収容する従来型のトレイ10を配設し、両者とも紙面手前方向に引き出し可能となっている。
【0014】
図1において、感光体3周りの複写動作及び給紙部の下段bからの給紙動作は公知であるので説明を省略し、給紙部の上段aからの給紙構成、動作を説明する。図2は給紙部の上段aを示す平面図、図3は側面図である。トレイ17に取手17bが設けてあり、トレイ17を複写機本体から引き出す際に用いるようになっている。
【0015】
トレイ17の搬送側前縁に設けた給紙手段15は、図中右側の第1用紙収容部11に積載した用紙P1と圧接して用紙を送り出す。第1用紙収容部11には用紙P1を位置決めする一対のサイドフェンス21、22と、用紙移送帯域、すなわち用紙P1が移動する範囲から待避可能な一対のバックフェンス23、24及び用紙P1を積載する底板16が配してある。バックフェンス23、24は、図示しない駆動部により適時作動可能に構成してある。
【0016】
底板16の下方には、底板16を押圧して給紙手段15方向へ付勢する上昇装置を設けてある。上昇装置は、加圧板18が固定してある加圧軸25を回転駆動する正逆転モータを含んだ駆動部26で構成してあり、加圧軸25が図3中で時計方向に回転するときに、加圧板18はトレイ17に開けた穴17aを超えて底板16を下方から持ち上げ、トレイ17に積載した用紙P1を上方に押し上げ付勢し、最上紙を給紙手段15の給紙ローラに当接させる。最上紙の高さは上限位置を制限するリミットスイッチ19の信号から底板16の上昇を制御し、一定の高さに保つように制御を行う。
【0017】
図中27は第1用紙収容部11内の用紙P1の有無を検知するペーパーエンドセンサであり、第1用紙収容部11に用紙P1が無いときには、ペーパーエンドセンサ27のフィラー部27aが底板16の開口部16aに落ち込むことによって第1用紙収容部11内に用紙P1が無いことを検知する。そして用紙P1が無いことを検知すると、加圧軸25を図3中で反時計方向に回転駆動させる。加圧板18がトレイの穴17aと接しない位置まで下降したことを下降検知センサ20によって検知するまで加圧軸25を反時計方向に回転させる。
【0018】
また、底板の開口部16aに対応してトレイ17の底部に用紙束検知センサ28が配してある。第1用紙収容部11に用紙が無いときに底板16がトレイ17の底部に位置するが、その時に用紙束検知センサ28のフィラー部は底板の開口部16aより上方へ突き出ている。トレイ17の図中左半分には用紙P2を位置決めする一対のサイドフェンス29、30、底板31、及び用紙P2の略中央部を押圧してこれを第1用紙収容部11へ一括して移送させる移動式バックフェンス32が設けてある。
【0019】
バックフェンス32は、底板31の下方に張設したタイミングベルト33と、底板31に開けた穴31aを介して駆動結合してある。タイミングベルト33は、プーリ34、35、36、37間に張設してあり、プーリ37を正逆転モータ38によって正逆転自在に回転駆動させることにより、バックフェンス32が往復動する。この往復動の位置決めは、バックフェンス32に設けた突出片32aをホームセンサ39と押し込みセンサ40で検知することにより行う。
【0020】
図中41は第2用紙収容部12の用紙P2の有無を検知する検知センサのフィラーであり、底板31に開けた小穴31bからこのフィラー41が突き出すことで用紙P2の有無検知を行っている。
【0021】
以下、この給紙装置の制御動作を説明する。 複写機本体の制御装置からスタート信号が入力されると、駆動部26が底板16を上昇させる。リミットスイッチ19での検出により底板16の上昇完了を検知すると、駆動部26が停止する。そこで、ペーパーエンドセンサ27の信号により第1用紙収容部11に用紙P1が残っていれば給紙動作を開始する。第1用紙収容部11の用紙P1が消費され、第1用紙収容部11が空になったことをペーパーエンドセンサ27によって検知し、さらに第2用紙収容部12内に用紙P2が存在していることをフィラー41により検知したら、駆動部26を駆動して底板16を下降させる。底板16が十分に下がったことを下降検知センサ20より検知したら駆動部26が停止し、エンドフェンス23、24を用紙移送帯域から退避させ、正逆転モータ38を駆動してバックフェンス32を第1用紙収容部11方向へ移動させ、第2用紙収容部12から第1用紙収容部11へ用紙P2の束を移動させる。
【0022】
第2用紙収容部12から第1用紙収容部11への用紙束の移送がジャム無く正常に行われる場合は、押し込みセンサ40がバックフェンス32の移送動作完了を検知するのと略同一のタイミングで、用紙束検知センサ28が用紙P2の束の先端底部到達を検知する。その時は、エンドフェンス23、24を用紙規制位置に移動させ、駆動部26を駆動して底板16を上昇させ、上述した給紙動作を再開させる。
【0023】
用紙P2の束の移送時に座屈ジャムが発生すると、押し込みセンサ40がバックフェンス32の移送動作完了を検知しても、用紙束検知センサ28が用紙束の先端底部の到達を検出できない。その場合は、すぐに駆動を停止すると同時に、複写機本体側の図示しない操作部にジャムを表示してジャム処理を促す。
【0024】
他の場合として、第2用紙収容部12に入れる用紙P2のサイズをユーザーが誤って所定寸法よりも小さいサイズの用紙をセットしたときも、上記と同様に押し込みセンサ40がバックフェンス32の移送動作完了を検知しても、用紙が小さいために用紙束検知センサ28が用紙束の先端底部の到達を検出できない。この場合も、ジャム処理フローに入るようにするとよい。
【0025】
逆に、第2用紙収容部12に入れる用紙P2のサイズを、ユーザーが誤って所定寸法よりも大きいサイズの用紙をセットしたときには、押し込みセンサ40がバックフェンス32の移送完了を検知する前に、用紙束検知センサ28が用紙束の先端底部の到達を検出してしまうので、この場合も、ジャム処理フローに入るようにするとよいが、複写機本体の操作部にジャム表示をするのと同時に、「セットする用紙サイズをご確認ください」等のメッセージをも表示すると、よりいっそういわゆる「ユーザーフレンドリーなマシン」となる。
【0026】
なお上記実施形態では、第1用紙収容部11の用紙束検知センサ28を図の一番右端一個所に設置しているが、用紙の移送方向途中部位にも数箇所設置すると、より高精度なジャム検知が可能となる。また用紙束検知センサ28で、用紙移送時の用紙先端底部の到達タイミングのみを検出しているが、トレイ17をマシンにセットした直後に第一用紙収容部11の用紙の有無を検知するようにしてもよい。通常は、第1用紙収容部11の用紙P1の有無は、底板16を上昇させた後においてペーパーエンド検知27によって行うが、この方式であると底板上昇時間が必要となり無駄である。用紙束検知センサ28をトレイ17セット後のみ用紙有無を検知するように使用すれば、用紙があるときのみ底板16を上昇させて給紙動作に移り、用紙が無い場合は第2用紙収容部12からの用紙移送動作へすぐに移ることが可能である。
【0027】
【発明の効果】
本発明に係る給紙装置及びこれを用いた画像形成装置は、以上説明してきたように、用紙移送時のジャムを的確に検知し、装置の破損を防止することができるという効果がある。
【図面の簡単な説明】
【図1】本発明の第1実施例を適用した複写機の概略図を示す構成図である。
【図2】図1の複写機が備える給紙部の上段を示す平面図である。
【図3】同じく側面図である。
【符号の説明】
1 コンタクトガラス
2 光学系
3 感光体
4 帯電器
5 現像器
6 転写・分離器
7 クリーニング部
8 定着部
9 レジストローラ対
10 従来型のトレイ
11 第1用紙収容部
12 第2用紙収容部
13 搬送手段
14 手差し給紙部
15 給紙手段
16 底板
16a 底板の開口部
17 トレイ
17a トレイの穴
18 加圧板
19 リミットスイッチ
20 下降検知センサ
21、22、29、30 サイドフェンス
23、24、32 バックフェンス
25 加圧軸
26 駆動部
27 ペーパーエンドセンサ
28 用紙束検知センサ
31 底板
31a 底板の穴
33 タイミングベルト
38 正逆転モータ
39 ホームセンサ
40 押し込みセンサ
41 フィラー
L1、L2、L3、L4 ガイドレール
P1、P2 用紙
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sheet feeder and an image forming apparatus using the same, such as a copying machine, a facsimile, and a printer.
[0002]
[Prior art]
Conventionally, a first sheet storage unit capable of stacking a plurality of sheets on a movable bottom plate, sheet feeding means for feeding sheets one by one from the first sheet storage unit, and substantially horizontally with the first sheet storage unit 2. Description of the Related Art There is known a paper feeder that includes a second paper storage unit that is arranged in parallel and is capable of stacking a plurality of paper sheets, and a unit that collectively transports the paper stacked in the second paper storage unit to the first paper storage unit. (For example, see Patent Document 1).
[0003]
This apparatus detects a jam when the sheets stacked in the second sheet storage unit are transferred to the first sheet storage unit at a time by detecting a position of a pressing plate for transferring the sheet and a home position sensor and a pressing plate detection sensor. When the load force that is caught during the transfer of a large number of paper bundles is larger than the rated torque of the motor, the rotation of the motor stops or becomes slow, and the signal of the pressure plate detection sensor becomes The jam is detected by disappearing or delaying.
[0004]
[Patent Document 1]
Patent No. 2831458 (Japanese Patent Laid-Open No. 04-179634)
[0005]
[Problems to be solved by the invention]
However, in the apparatus disclosed in Patent Document 1, when a jam occurs when the number of sheets stacked in the second sheet storage unit is small, the load force of the sheet jam during transfer is lower than the rated torque of the transfer motor, and Even if the sheet bundle has buckled and jammed, the movement of the pressing plate is completed, and the output of the pressing plate detection sensor cannot detect the jam, and the operation is switched to the next operation, that is, the operation of feeding paper. If the bottom plate of the first sheet storage unit is raised in a state where the sheet bundle is buckled, the bottom plate or the lifting mechanism may be damaged.
[0006]
An object of the present invention is to provide a paper feeder capable of accurately detecting a jam during paper transfer and preventing damage to the apparatus, and an image forming apparatus using the same, in view of the above conventional technology. .
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a sheet feeder according to claim 1 of the present invention has a movable bottom plate, and a first sheet storage portion capable of stacking a plurality of sheets on the bottom plate; A sheet feeding unit for feeding sheets one by one from the sheet storage unit, a second sheet storage unit arranged substantially horizontally and in parallel with the first sheet storage unit, and capable of stacking a plurality of sheets, A transfer unit for transferring the sheets stacked in the second sheet storage unit to the first sheet storage unit at a time, wherein at least one portion is provided on a movable bottom plate for stacking the sheets in the first sheet storage unit. Paper bundle detecting means for detecting the leading edge of the bottom portion of the sheet bundle to be transferred to the first sheet storage portion is provided at the bottom of the first sheet storage portion in correspondence with each of the at least one opening; Transporting the paper stored in the first paper storage section through the bottom plate; A bottom plate pressing means for biasing to the step side is provided, and the bias of the bottom plate pressing means can be released when the paper in the second paper storage section is transferred to the first paper storage section. I do.
[0008]
According to a second aspect of the present invention, in order to achieve the above object, in the paper feeder according to the first aspect, an opening provided in a movable bottom plate of the first paper storage portion is provided with the presence or absence of paper during a paper supply operation. And also serves as an opening for detecting the paper end for detecting the paper end.
[0009]
In order to achieve the above object, the image forming apparatus according to the third aspect uses the sheet feeding device according to the first or second aspect, and the sheet bundle detecting unit detects the sheet bundle based on the transfer start time of the sheet by the transfer unit. Means for counting the transfer time until the bottom end is detected, means for determining that the paper is being transported when the transfer time counted by the counting means exceeds a predetermined time, and determination output of the determination means. Accordingly, the transfer operation of the transfer means is stopped, and a display section jam message is displayed.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing a schematic diagram of a copying machine to which the first embodiment of the present invention is applied. In the drawing, reference numeral 1 denotes a contact glass on which a document is placed, 2 denotes an optical system for irradiating the document and exposing the photoconductor 3, 4 denotes a charger, 5 denotes a developing device, 6 denotes a transfer / separator, 7 denotes a cleaning unit, Reference numeral 8 denotes a fixing unit, 9 denotes a pair of registration rollers, and 10 denotes a conventional tray for storing large-sized paper. In the figure, reference numeral 11 denotes a first paper storage unit, and reference numeral 12 denotes a second paper storage unit disposed horizontally and in parallel with the first paper storage unit 11.
[0011]
Further, in the drawing, L1 and L2 are guide rails for pulling out the upper tray 17, and 13 is a conventional tray 10 or a sheet P1 selected and fed from the first sheet storage unit 11 and fed to the registration roller pair 9. Transport means for transporting; 14, a manual paper feed section for paper; L3, L4, guide rails for guiding when pulling out the conventional tray 10; 15, paper feed means comprising a pickup roller, a feed roller, and a separation roller; Reference numeral 16 denotes a rotatable (liftable) bottom plate having one end engaged with the tray 17.
[0012]
Reference numeral 18 in the drawing denotes a pressure plate which is rotatable by a drive unit (not shown) fixed to the copying machine main body, and one end of which contacts the bottom plate 16 through a hole 17a of the tray. Reference numeral 19 denotes a limit switch for limiting the uppermost position of the uppermost sheet of the sheets P1 on the bottom plate 16, and reference numeral 20 denotes a descent detecting sensor for detecting that the pressure plate 18 has been lowered to a position where it does not contact the hole 17a of the tray.
[0013]
As described above, the conventional paper feed unit including the tray 10, the first paper storage unit 11, and the second paper storage unit 12 is of a two-stage paper feed type including an upper stage a and a lower stage b. An embodiment of the paper feeding device according to the present invention, that is, a conventional type in which a tray 17 capable of storing two bundles of half-size paper such as A4 is provided, and a large-size paper such as A3 is stored on the lower side b side. A tray 10 is provided, and both can be pulled out toward the front of the paper.
[0014]
In FIG. 1, the copying operation around the photoconductor 3 and the paper feeding operation from the lower stage b of the paper feeding unit are well-known, and thus the description is omitted, and the configuration and operation of the paper feeding from the upper stage a of the paper feeding unit will be described. FIG. 2 is a plan view showing the upper stage a of the sheet feeding unit, and FIG. 3 is a side view. A handle 17b is provided on the tray 17, and is used when the tray 17 is pulled out from the copying machine main body.
[0015]
The paper feeding means 15 provided at the front edge on the transport side of the tray 17 presses out the paper P1 loaded in the first paper storage unit 11 on the right side in the drawing and sends out the paper. A pair of side fences 21 and 22 for positioning the sheet P1 and a pair of back fences 23 and 24 and the sheet P1 that can be retracted from the sheet transfer zone, that is, the range in which the sheet P1 moves, are stacked in the first sheet storage unit 11. A bottom plate 16 is provided. The back fences 23 and 24 are configured to be operable as needed by a drive unit (not shown).
[0016]
Below the bottom plate 16, there is provided a lifting device which presses the bottom plate 16 and urges it toward the paper feeding means 15. The lifting device is constituted by a driving unit 26 including a forward / reverse rotation motor for driving the pressing shaft 25 to which the pressing plate 18 is fixed. When the pressing shaft 25 rotates clockwise in FIG. Then, the pressure plate 18 lifts the bottom plate 16 from below beyond the hole 17a opened in the tray 17, pushes and urges the paper P1 stacked on the tray 17 upward, and pushes the uppermost paper to the paper feed roller of the paper feeding means 15. Abut. The height of the uppermost sheet is controlled by controlling the ascent of the bottom plate 16 from a signal from a limit switch 19 for limiting the upper limit position so as to maintain the height at a constant height.
[0017]
In the drawing, reference numeral 27 denotes a paper end sensor for detecting the presence or absence of a sheet P1 in the first sheet storage unit 11. When there is no sheet P1 in the first sheet storage unit 11, the filler unit 27a of the paper end sensor 27 It is detected that there is no sheet P1 in the first sheet storage unit 11 by dropping into the opening 16a. When detecting that there is no sheet P1, the pressure shaft 25 is driven to rotate counterclockwise in FIG. The pressure shaft 25 is rotated counterclockwise until the pressure detection plate 20 detects that the pressure plate 18 has been lowered to a position where the pressure plate 18 does not contact the hole 17a of the tray.
[0018]
Further, a sheet bundle detection sensor 28 is disposed at the bottom of the tray 17 corresponding to the opening 16a of the bottom plate. The bottom plate 16 is located at the bottom of the tray 17 when there is no sheet in the first sheet storage unit 11, and at this time, the filler portion of the sheet bundle detection sensor 28 protrudes above the opening 16a of the bottom plate. In the left half of the tray 17 in the figure, a pair of side fences 29, 30, the bottom plate 31, and the substantially central portion of the sheet P2 for positioning the sheet P2 are pressed and transferred to the first sheet accommodating section 11 in a lump. A movable back fence 32 is provided.
[0019]
The back fence 32 is drivingly connected to a timing belt 33 stretched below the bottom plate 31 via a hole 31 a formed in the bottom plate 31. The timing belt 33 is stretched between the pulleys 34, 35, 36, and 37. The back fence 32 reciprocates by rotating the pulley 37 by a forward / reverse rotation motor 38 so as to freely rotate forward and backward. The positioning of the reciprocation is performed by detecting the projecting piece 32 a provided on the back fence 32 with the home sensor 39 and the push sensor 40.
[0020]
In the drawing, reference numeral 41 denotes a filler of a detection sensor for detecting the presence or absence of the paper P2 in the second paper storage unit 12, and the presence or absence of the paper P2 is detected by the filler 41 protruding from a small hole 31b formed in the bottom plate 31.
[0021]
Hereinafter, the control operation of the sheet feeding device will be described. When a start signal is input from the control device of the copying machine main body, the drive unit 26 raises the bottom plate 16. When the completion of the raising of the bottom plate 16 is detected by the detection of the limit switch 19, the driving unit 26 stops. Therefore, if the sheet P1 remains in the first sheet storage unit 11 according to the signal of the paper end sensor 27, the sheet feeding operation is started. The paper end sensor 27 detects that the paper P1 in the first paper storage unit 11 has been consumed and the first paper storage unit 11 has been emptied, and the paper P2 is present in the second paper storage unit 12. When this is detected by the filler 41, the drive unit 26 is driven to lower the bottom plate 16. When the lowering sensor 20 detects that the bottom plate 16 has been sufficiently lowered, the drive unit 26 stops, the end fences 23 and 24 are retracted from the paper transfer zone, and the forward / reverse rotation motor 38 is driven to move the back fence 32 to the first position. The sheet P2 is moved in the direction of the sheet storage unit 11 to move the bundle of sheets P2 from the second sheet storage unit 12 to the first sheet storage unit 11.
[0022]
When the transfer of the sheet bundle from the second sheet storage unit 12 to the first sheet storage unit 11 is normally performed without a jam, at substantially the same timing as when the push sensor 40 detects the completion of the transfer operation of the back fence 32. Then, the sheet bundle detection sensor 28 detects that the bundle of sheets P2 reaches the leading end bottom. At that time, the end fences 23 and 24 are moved to the sheet regulating position, the driving unit 26 is driven to raise the bottom plate 16, and the above-described sheet feeding operation is restarted.
[0023]
If the buckling jam occurs during the transfer of the bundle of sheets P2, the sheet bundle detection sensor 28 cannot detect the arrival of the bottom of the leading end of the sheet bundle even if the push sensor 40 detects the completion of the transfer operation of the back fence 32. In this case, the driving is immediately stopped, and at the same time, a jam is displayed on an operation unit (not shown) of the copying machine main body to prompt the user to perform the jam processing.
[0024]
As another case, even when the user mistakenly sets the size of the paper P2 to be put in the second paper storage unit 12 to a size smaller than the predetermined size, the push sensor 40 operates to move the back fence 32 in the same manner as described above. Even when the completion is detected, the sheet bundle detection sensor 28 cannot detect the arrival of the leading end bottom of the sheet bundle because the sheet is small. Also in this case, it is preferable to enter the jam processing flow.
[0025]
Conversely, when the user mistakenly sets the size of the paper P2 to be put in the second paper storage unit 12 to a size larger than the predetermined size, the push sensor 40 detects that the transfer of the back fence 32 has been completed. Since the sheet bundle detection sensor 28 detects the arrival at the bottom of the leading end of the sheet bundle, it is also preferable to enter the jam processing flow in this case. However, at the same time as displaying the jam on the operation unit of the copying machine main body, If a message such as "Please check the paper size to be set" is also displayed, the so-called "user-friendly machine" is further improved.
[0026]
In the above embodiment, the sheet bundle detection sensor 28 of the first sheet storage unit 11 is installed at one position on the rightmost side in the figure. Jam detection becomes possible. Although the sheet bundle detection sensor 28 detects only the arrival timing of the bottom of the leading end of the sheet when transferring the sheet, the presence or absence of the sheet in the first sheet storing unit 11 is detected immediately after the tray 17 is set in the machine. You may. Normally, the presence or absence of the sheet P1 in the first sheet storage unit 11 is performed by the paper end detection 27 after the bottom plate 16 is raised. However, this method is wasteful because the bottom plate rising time is required. If the sheet bundle detection sensor 28 is used so as to detect the presence or absence of a sheet only after the tray 17 is set, the bottom plate 16 is raised only when there is a sheet and the operation proceeds to the sheet feeding operation. It is possible to immediately move to the sheet transfer operation from the printer.
[0027]
【The invention's effect】
As described above, the sheet feeding device and the image forming apparatus using the same according to the present invention have an effect that the jam at the time of sheet transfer can be accurately detected and the device can be prevented from being damaged.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a schematic diagram of a copying machine to which a first embodiment of the present invention is applied.
FIG. 2 is a plan view showing an upper stage of a paper feeding unit provided in the copying machine of FIG. 1;
FIG. 3 is a side view of the same.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 contact glass 2 optical system 3 photoreceptor 4 charger 5 developing device 6 transfer / separator 7 cleaning unit 8 fixing unit 9 registration roller pair 10 conventional tray 11 first paper storage unit 12 second paper storage unit 13 14 Manual paper feeder 15 Paper feeder 16 Bottom plate 16a Bottom plate opening 17 Tray 17a Tray hole 18 Pressurizing plate 19 Limit switch 20 Lowering detection sensor 21, 22, 29, 30 Side fence 23, 24, 32 Back fence 25 Pressure shaft 26 Drive unit 27 Paper end sensor 28 Sheet bundle detection sensor 31 Bottom plate 31a Hole in bottom plate 33 Timing belt 38 Forward / reverse rotation motor 39 Home sensor 40 Push sensor 41 Filler L1, L2, L3, L4 Guide rails P1, P2 Paper

Claims (3)

可動の底板を有し、該底板上に複数枚の用紙を積載可能な第1用紙収容部と、該第1用紙収容部から用紙を1枚ずつ給紙するための給紙手段と、該第1用紙収容部と略水平かつ並列に配置し、複数枚の用紙を積載可能な第2用紙収容部と、該第2用紙収容部に積載した用紙を一括して上記第1用紙収容部へ移送する移送手段とを有する給紙装置において、上記第1用紙収容部の用紙を積載する可動の底板に少なくとも1個所の開口を形成し、上記第1用紙収容部へ移送する用紙束底部先端を検知する用紙束検知手段を上記少なくとも1箇所の開口にそれぞれ対応させて上記第1用紙収容部の底部に設け、かつ上記第1用紙収容部に収容した用紙を、上記底板を介して上記移送手段側へ付勢する底板加圧手段を設け、該底板加圧手段の付勢を上記第2用紙収容部内の用紙を上記第1用紙収容部へ移送する際に解除可能としてなることを特徴とする給紙装置。A first sheet storage unit having a movable bottom plate and capable of stacking a plurality of sheets on the bottom plate; sheet feeding means for feeding sheets one by one from the first sheet storage unit; A second paper storage unit that is arranged substantially horizontally and in parallel with the one paper storage unit and is capable of stacking a plurality of sheets, and the paper loaded in the second paper storage unit is collectively transferred to the first paper storage unit And a transfer means for transferring a sheet bundle, wherein at least one opening is formed in a movable bottom plate on which sheets of the first sheet storage section are stacked, and a bottom end of a sheet bundle to be transferred to the first sheet storage section is detected. Sheet bundle detecting means are provided at the bottom of the first sheet accommodating portion so as to correspond to the at least one opening, respectively, and the sheet accommodated in the first sheet accommodating portion is transferred to the transfer means side via the bottom plate. A bottom plate pressurizing means for urging the bottom plate pressurizing means. Sheet feeding apparatus the paper in the second sheet storage portion, characterized by comprising a releasable when transferred to the first sheet accommodating portion. 請求項1の給紙装置において、上記第1用紙収容部の可動の底板に設けた開口が、給紙動作中の用紙の有無を検知するペーパーエンド検知用の開口を兼ねることを特徴とする給紙装置。2. The sheet feeding device according to claim 1, wherein the opening provided in the movable bottom plate of the first sheet storage portion also serves as a paper end detection opening for detecting the presence or absence of a sheet during the sheet feeding operation. Paper equipment. 請求項1また2の給紙装置を用い、上記移送手段による上記用紙の移送開始時間から該用紙束検知手段が用紙束底部先端を検知するまでの移送時間をカウントする手段と、該カウント手段がカウントした上記移送時間が所定時間を外れた場合に用紙移送中のジャムと判断する手段と、該判断手段の判断出力に応じて上記移送手段の移送動作を停止させると共に表示部ジャムメッセージを表示することを特徴とする画像形成装置。And a means for counting a transfer time from a transfer start time of the sheet by the transfer means to a time at which the sheet bundle detecting means detects the bottom end of the sheet bundle, wherein the counting means comprises: Means for judging a jam during sheet transfer when the counted transfer time exceeds a predetermined time, and stopping the transfer operation of the transfer means and displaying a jam message on the display unit according to the judgment output of the judgment means. An image forming apparatus comprising:
JP2003055331A 2003-03-03 2003-03-03 Sheet feeder and image forming apparatus using the same Pending JP2004262606A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009132514A (en) * 2007-11-30 2009-06-18 Kyocera Mita Corp Paper feeder and image forming device
JP2013063845A (en) * 2011-09-20 2013-04-11 Konica Minolta Business Technologies Inc Paper feeder and image forming device including the same
US10745223B2 (en) 2014-11-13 2020-08-18 Konica Minolta, Inc. Paper feeder and image forming apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009132514A (en) * 2007-11-30 2009-06-18 Kyocera Mita Corp Paper feeder and image forming device
JP2013063845A (en) * 2011-09-20 2013-04-11 Konica Minolta Business Technologies Inc Paper feeder and image forming device including the same
US10745223B2 (en) 2014-11-13 2020-08-18 Konica Minolta, Inc. Paper feeder and image forming apparatus

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