JPH0769468A - One-sheet paper feeding mechanism, image former and document feeder - Google Patents

One-sheet paper feeding mechanism, image former and document feeder

Info

Publication number
JPH0769468A
JPH0769468A JP5243840A JP24384093A JPH0769468A JP H0769468 A JPH0769468 A JP H0769468A JP 5243840 A JP5243840 A JP 5243840A JP 24384093 A JP24384093 A JP 24384093A JP H0769468 A JPH0769468 A JP H0769468A
Authority
JP
Japan
Prior art keywords
sheet
feeding
paper
rotary
paper feed
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.)
Withdrawn
Application number
JP5243840A
Other languages
Japanese (ja)
Inventor
Hiroshi Miura
弘 三浦
Original Assignee
Canon Aptecs Kk
キヤノンアプテックス株式会社
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 Canon Aptecs Kk, キヤノンアプテックス株式会社 filed Critical Canon Aptecs Kk
Priority to JP5243840A priority Critical patent/JPH0769468A/en
Publication of JPH0769468A publication Critical patent/JPH0769468A/en
Withdrawn legal-status Critical Current

Links

Abstract

PURPOSE:To provide a highly reliable one-sheet separation paper feeding mechanism that can reduce any effect of factors, such as static electricity, adhesion, frictional resistance, slidability or the like among sheets, to a one-sheet separation paper feeding capacity and to feed loading sheets in a one-sheet separation manner without entailing any double feeding. CONSTITUTION:In a state that a sheet of loading pair P is held down by a presser means 32, a lower side paper feed roller 22 is made to contact with a loading paper part at the more paper feeding direction downstream side than the pressing part, and thereby a sheet of uppermost paper P1 is made to do its backward feed B as forming a loop P' in paper part lying between the lower side paper feed roller and a rubber plate, and then a tip part Pa of the uppermost paper P1 is made to ride over the upside from the downside of the lower side paper feed roller 11, whereby the uppermost paper P1 is separated piece by piece. Next, the lower side paper feed roller 11 is rockedly shifted to the side of an upper side paper feed roller 26 from the side of the loading paper P and the one-sheet separate paper is held between both these upper and lower paper feed rollers 26 and 11, and in a state that paper pressing is released, the loading paper is pinched and conveyed in the paper feeding direction by both these paper feed rollers.

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、例えば、複写機・プリ
ンタ等の画像形成装置において、給紙部にセットした転
写紙・記録紙・OHPシート・封筒・葉書等の積載用紙
を順次に1枚分離して作像部へ給送する1枚分離給紙機
構、ないしは給紙部にセットした積載用紙を1枚分離給
紙機構で作像部へ1枚分離給紙して画像形成を実行させ
る画像形成装置、原稿載置部にセットした積載原稿を順
次に1枚分離して原稿露光部(読取り部・投影部)へ給
送する原稿給送装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, for example, in an image forming apparatus such as a copying machine or a printer, sequentially transfers stacked sheets of transfer paper, recording paper, OHP sheets, envelopes, postcards, etc. Single-sheet separation / feed mechanism that separates the sheets and feeds them to the image forming section, or the stacked sheets set in the paper feed section separates and feeds one sheet to the image forming section using the single-sheet separation / feeding mechanism to execute image formation. The present invention relates to an image forming apparatus and a document feeding apparatus that sequentially separates one stacked document set on a document placing section and feeds it to a document exposure section (reading section / projection section).
【0002】[0002]
【従来の技術】積載用紙(原稿)から用紙を順次に1枚
分離して給送する1枚分離給紙機構としては、分離爪方
式、リタードローラ方式、摩擦パッド方式など種々の原
理・方式のものが知られている。
2. Description of the Related Art As a one-sheet separating / feeding mechanism for sequentially separating and feeding one sheet from a stacked sheet (original), there are various principles and methods such as a separating claw method, a retard roller method, and a friction pad method. Things are known.
【0003】そのような従来の1枚分離給紙機構は何れ
も、給紙ローラと用紙の関係(位相)は、給紙ローラが
上側であれば用紙は常に下側、給紙ローラが下側であれ
ば用紙は常に上側にあり、給紙ローラで積載用紙の最上
位または最下位の用紙に給紙方向への繰り出し力を与
え、用紙分離部材との共働により、該用紙を次位以降の
用紙から1枚分離させて給送させるものであった。
In all such conventional single-sheet separating / feeding mechanisms, the relationship (phase) between the sheet feeding roller and the sheet is that the sheet is always on the lower side and the sheet feeding roller is on the lower side if the sheet feeding roller is on the upper side. If so, the paper is always on the upper side, and the paper feed roller gives a feeding force to the uppermost or the lowermost paper of the stacked papers in the paper feeding direction. One sheet was separated from the paper sheet and then fed.
【0004】[0004]
【発明が解決しようとしている課題】上記従来機構の何
れも1枚分離給紙性能は、用紙相互の静電気・密着性・
摩擦抵抗・すべり性等のファクターで左右され易く、こ
れ等のファクターは使用用紙によって多種多様であり、
また同じ用紙でも環境変動等でそれ等のファクターは変
動し易く、そのため2枚以上の用紙が1度に給紙される
所謂「重送現象」を起こし易いという問題があった。
The above-mentioned conventional mechanisms have the single-sheet separating / feeding performances such as static electricity / adhesion / contact between sheets.
It is easily affected by factors such as friction resistance and slipperiness, and these factors vary widely depending on the paper used.
Further, even if the same paper is used, factors such as those are likely to change due to environmental changes, so that there is a problem that a so-called “double feed phenomenon” in which two or more papers are fed at once is likely to occur.
【0005】そこで本発明は、用紙相互の静電気・密着
性・摩擦抵抗・すべり性等のファクターの1枚分離給紙
性能への影響を少なくして、重送現象を生じさせずに用
紙を確実に1枚分離給紙させることが可能な信頼性の高
い1枚分離給紙手段を提供することを目的とする。
Therefore, the present invention reduces the influence of factors such as static electricity, adhesion, frictional resistance, and slippage between paper sheets on the performance of single-sheet separation and feeding, and ensures paper feeding without causing a double feed phenomenon. It is an object of the present invention to provide a highly reliable single-sheet separating / feeding means capable of separating and feeding one sheet separately.
【0006】[0006]
【課題を解決するための手段】本発明は下記の構成を特
徴とする、1枚分離給紙機構、画像形成装置、及び原稿
給送装置である。
The present invention is a single-sheet separating / feeding mechanism, an image forming apparatus, and a document feeding apparatus, which are characterized by the following configurations.
【0007】(1)第1の給紙用回転体と、第2の給紙
用回転体と、該第2の給紙用回転体を前記第1の給紙用
回転体と積載用紙との間に揺動させて、第1の給紙用回
転体に接触させた第1切換え状態と、積載用紙面に接触
させた第2切換え状態に転換させる移動手段と、前記第
1切換え状態において第1と第2の給紙用回転体との圧
接ニップ部で用紙を給紙方向に挟持搬送する方向に少な
くとも第2の給紙用回転体を回転させる駆動手段と、前
記第2切換え状態において積載用紙に接触した第2の給
紙用回転体の位置よりも給紙方向上流側において積載用
紙に作用して積載用紙の給紙方向とは反対方向への動き
を規制する用紙押え手段と、前記第2切換え状態におい
て積載用紙に接触した前記第2の給紙用回転体の回転に
より該第2の給紙用回転体が直接接している用紙が給紙
方向とは逆方向に搬送されることで該第2の給紙用回転
体と前記用紙押え手段との間に用紙のループが形成され
ながら該用紙の先端部が該第2の給紙用回転体の位置を
抜けて該第2の給紙用回転体の積載用紙側とは反対側へ
移行したことを検知する用紙検知手段と、給紙信号によ
り前記駆動手段をオンさせ、また前記移動手段により前
記第2の給紙用回転体を第2切換え状態に転換させ、前
記用紙検知手段の用紙検知信号により前記第2の給紙回
転体を第1切換え状態に転換させる制御手段を有するこ
とを特徴とする1枚分離給紙機構。
(1) A first paper feed rotary member, a second paper feed rotary member, and a second paper feed rotary member that connects the first paper feed rotary member and stacked sheets. A moving unit that swings between them to switch between a first switching state in which the first sheet-feeding rotary member is in contact with the first sheet-feeding rotary member and a second switching state in which the sheet-sheet surface is in contact with the first sheet-rotating member; Driving means for rotating at least the second sheet feeding rotary member in the direction of sandwiching and conveying the sheet in the sheet feeding direction at the pressure contact nip portion between the first and second sheet feeding rotary members, and loading in the second switching state. Paper pressing means that acts on the stacked sheets of paper upstream of the position of the second sheet feeding rotary member that is in contact with the sheets to restrict the movement of the stacked sheets in the direction opposite to the sheet feeding direction; In the second switching state, the rotation of the second sheet feeding rotary member that comes into contact with the stacked sheets causes the second sheet feeding. The sheet directly contacting the rotator is conveyed in a direction opposite to the sheet feeding direction, so that a loop of the sheet is formed between the second sheet rotator and the sheet pressing means. Paper detection means for detecting that the front end has passed through the position of the second paper feed rotary member and has moved to the side opposite to the stacked paper side of the second paper feed rotary member, and a paper feed signal The driving means is turned on, the moving means changes the second sheet feeding rotary body to the second switching state, and the second sheet feeding rotary body is set to the first state by the sheet detection signal of the sheet detecting means. A single-sheet separating / feeding mechanism having control means for switching to a switching state.
【0008】(2)前記用紙押え手段が、移動手段によ
り積載用紙から非接触に退避した第1切換え状態と、積
載用紙に接触して用紙を押えた第2切換え状態とに転換
される部材であり、前記第2の給紙用回転体が第2切換
え状態に転換される前に或いは同時的に第2状態に転換
され、前記第2の給紙用回転体が第1切換え状態に転換
されたとき同時的に第1切換え状態に転換されることを
特徴とする(1)に記載の1枚分離給紙機構。
(2) A member for switching the sheet pressing means between a first switching state in which the moving means retracts the stacked sheets in a non-contact manner and a second switching state in which the stacked sheets are brought into contact with each other to press the sheets. Yes, the second sheet feeding rotary body is switched to the second state before or at the same time as the second sheet feeding rotary body is switched to the second switching state, and the second sheet feeding rotary body is switched to the first switching state. The single-sheet separating / feeding mechanism described in (1) is characterized in that the two sheets are simultaneously switched to the first switching state at the time.
【0009】(3)前記第2給紙用回転体の第1切換え
状態において第1と第2の給紙用回転体が共に圧接ニッ
プ部で用紙を給紙方向に挟持搬送する方向に回転駆動さ
れることを特徴とする(1)に記載の1枚分離給紙機
構。
(3) In the first switching state of the second sheet feeding rotary member, both the first and second sheet feeding rotating members are rotationally driven in a direction in which the sheet is sandwiched and conveyed in the sheet feeding direction at the pressure contact nip portion. The one-sheet separating / feeding mechanism according to (1) is characterized in that
【0010】(4)給紙部にセットした積載用紙を1枚
分離給紙機構で作像部へ1枚分離給紙して画像形成を実
行させる画像形成装置であり、前記の1枚分離給紙機構
は、第1の給紙用回転体と、第2の給紙用回転体と、該
第2の給紙用回転体を前記第1の給紙用回転体と積載用
紙との間に揺動させて、第1の給紙用回転体に接触させ
た第1切換え状態と、積載用紙面に接触させた第2切換
え状態に転換させる移動手段と、前記第1切換え状態に
おいて第1と第2の給紙用回転体との圧接ニップ部で用
紙を給紙方向に挟持搬送する方向に少なくとも第2の給
紙用回転体を回転させる駆動手段と、前記第2切換え状
態において積載用紙に接触した第2の給紙用回転体の位
置よりも給紙方向上流側において積載用紙に作用して積
載用紙の給紙方向とは反対方向への動きを規制する用紙
押え手段と、前記第2切換え状態において積載用紙に接
触した前記第2の給紙用回転体の回転により該第2の給
紙用回転体が直接接している用紙が給紙方向とは逆方向
に搬送されることで該第2の給紙用回転体と前記用紙押
え手段との間に用紙のループが形成されながら該用紙の
先端部が該第2の給紙用回転体の位置を抜けて該第2の
給紙用回転体の積載用紙側とは反対側へ移行したことを
検知する用紙検知手段と、給紙信号により前記駆動手段
をオンさせ、また前記移動手段により前記第2の給紙用
回転体を第2切換え状態に転換させ、前記用紙検知手段
の用紙検知信号により前記第2の給紙回転体を第1切換
え状態に転換させる制御手段を有してなることを特徴と
する画像形成装置。
(4) An image forming apparatus that separates and feeds the stacked sheets set in the sheet feeding section to the image forming section by the single sheet separating and feeding mechanism to execute image formation. The paper mechanism includes a first paper feed rotator, a second paper feed rotator, and a second paper feed rotator between the first paper feed rotator and stacked sheets. A moving unit that swings to switch between a first switching state in which the first sheet feeding rotary member is brought into contact with the first sheet feeding rotary member and a second switching state in which the sheet is placed in contact with the stacked sheet surface, and a first switching state in the first switching state. Driving means for rotating at least the second sheet feeding rotary member in a direction of sandwiching and transporting the sheet in the sheet feeding direction at the pressure contact nip portion with the second sheet feeding rotary member, and stacking sheets in the second switching state. The stacked paper feed direction acting on the stacked paper upstream of the contact position of the second paper feed rotator in the paper feed direction. Is in direct contact with the sheet pressing means for restricting the movement in the opposite direction and the second sheet feeding rotary member which is brought into contact with the stacked sheets in the second switching state by the rotation of the second sheet feeding rotary member. By conveying the existing paper in the direction opposite to the paper feeding direction, a loop of the paper is formed between the second paper feeding rotary member and the paper pressing means, and the leading end of the paper is moved to the second paper feeding direction. Sheet detection means for detecting that the sheet has passed through the position of the sheet feeding rotator and has moved to the side opposite to the stacked sheet side of the second sheet rotator, and the driving means is turned on by the sheet feeding signal. A control for switching the second sheet feeding rotary member to the second switching state by the moving unit and for switching the second sheet feeding rotary member to the first switching state by the sheet detection signal of the sheet detection unit. An image forming apparatus comprising means.
【0011】(5)原稿載置部にセットした積載原稿を
1枚分離給紙機構で原稿露光部あるいは読取り部へ1枚
分離給紙する原稿給送装置であり、前記の1枚分離給紙
機構は、第1の給紙用回転体と、第2の給紙用回転体
と、該第2の給紙用回転体を前記第1の給紙用回転体と
積載原稿との間に揺動させて、第1の給紙用回転体に接
触させた第1切換え状態と、積載原稿面に接触させた第
2切換え状態に転換させる移動手段と、前記第1切換え
状態において第1と第2の給紙用回転体との圧接ニップ
部で用紙を給紙方向に挟持搬送する方向に少なくとも第
2の給紙用回転体を回転させる駆動手段と、前記第2切
換え状態において積載原稿に接触した第2の給紙用回転
体の位置よりも給紙方向上流側において積載原稿に作用
して積載原稿の給紙方向とは反対方向への動きを規制す
る原稿押え手段と、前記第2切換え状態において積載原
稿に接触した前記第2の給紙用回転体の回転により該第
2の給紙用回転体が直接接している原稿が給紙方向とは
逆方向に搬送されることで該第2の給紙用回転体と前記
原稿押え手段との間に用紙のループが形成されながら該
原稿の先端部が該第2の給紙用回転体の位置を抜けて該
第2の給紙用回転体の積載原稿側とは反対側へ移行した
ことを検知する原稿検知手段と、原稿給紙信号により前
記駆動手段をオンさせ、また前記移動手段により前記第
2の給紙用回転体を第2切換え状態に転換させ、前記原
稿検知手段の原稿検知信号により前記第2の給紙回転体
を第1切換え状態に転換させる制御手段を有してなるこ
とを特徴とする原稿給送装置。
(5) A document feeding device for feeding one sheet of a stacked document set on the document placing section to the document exposure section or the reading section by the one-sheet separating / feeding mechanism. The mechanism swings the first paper feed rotary member, the second paper feed rotary member, and the second paper feed rotary member between the first paper feed rotary member and the stacked document. Moving means for moving the first sheet-feeding rotator into a first switching state and a second switching state in which the sheet is in contact with the stacked document surface; and first and second switching states in the first switching state. Drive means for rotating at least the second sheet feeding rotary member in the direction of nipping and conveying the sheet in the sheet feeding direction at the pressure contact nip portion with the second sheet feeding rotary member, and contacting the stacked document in the second switching state. The stacked originals are fed by feeding the stacked originals on the upstream side in the sheet feeding direction with respect to the position of the second feeding roller. The document pressing means for restricting the movement in the direction opposite to the direction and the rotation of the second paper feeding rotary member that comes into contact with the stacked document in the second switching state cause the second paper feeding rotary member to directly move. The original in contact with the original is conveyed in a direction opposite to the paper feeding direction, so that a loop of the paper is formed between the second paper feeding rotary member and the original pressing means, and the leading end of the original is A document detecting unit that detects that the second sheet feeding rotary member has passed through the position and moved to the side opposite to the loaded document side of the second sheet feeding rotating member, and the driving unit based on the document feeding signal. Is turned on, the second feeding rotary member is switched to the second switching state by the moving unit, and the second feeding rotary member is set to the first switching state by the document detection signal of the document detecting unit. A document feeding device comprising control means for converting.
【0012】[0012]
【作用】即ち、積載用紙(原稿)を用紙押え手段により
給紙方向とは反対方向への動きを規制させた状態におい
て、第2の給紙回転体を駆動手段で駆動させ且つ積載用
紙に接触させた第2切換え状態に転換させることで、積
載用紙に接触した該第2の給紙用回転体の回転により該
第2の給紙用回転体が直接接している用紙が給紙方向と
は逆方向に搬送されて該第2の給紙用回転体と前記用紙
押え手段との間に用紙ループが形成されながら該用紙の
先端部が該第2の給紙用回転体の位置を抜けて該第2の
給紙用回転体の積載用紙側とは反対側へ移行して該用紙
が次位以下の用紙から1枚分離される。この場合、上記
の用紙ループの形成により、1枚分離される該用紙と次
位の用紙のすきまが大きくなって1枚分離される該用紙
と次位の用紙との密着性がなくなり、該用紙の確実な1
枚分離がなされる。
That is, in a state in which the stacked paper (original) is restricted from moving in the direction opposite to the paper feeding direction by the paper pressing means, the second paper feeding rotary member is driven by the driving means and comes into contact with the stacked paper. By switching to the second switching state, the sheet in direct contact with the second sheet-feeding rotor due to the rotation of the second sheet-feeding rotor in contact with the stacked sheets is not in the sheet-feeding direction. While being conveyed in the opposite direction, a paper loop is formed between the second paper feed rotator and the paper pressing means, and the leading end of the paper leaves the position of the second paper feed rotator. The second sheet feeding rotary member is moved to the side opposite to the stacked sheet side, and the sheet is separated from the second and lower sheets by one sheet. In this case, due to the formation of the above-mentioned paper loop, the gap between the separated paper and the next paper becomes large, and the adhesion between the separated paper and the next paper is lost, and the paper is separated. Sure one
The sheets are separated.
【0013】そして、第2の給紙用回転体の積載用紙接
触側とは反対側へ移行して1枚分離された用紙は、次い
で第2の給紙用回転体が第1の給紙用回転体に接触した
第1切換え状態に転換されることで該第1と第2の給紙
用回転体の間に挟持され、用紙押えが解除された状態に
おいて該両給紙用回転体により給紙方向に挟持搬送され
ていく。この場合、該搬送用紙は積載用紙から更に離間
して次位以下の積載用紙と接する面が少ないので、静電
気・すべり性・摩擦抵抗の影響が少ない。
Then, the second paper-feeding rotary member moves to the side opposite to the stacked paper-contacting side, and one sheet is separated. The sheet is clamped between the first and second sheet feeding rotating bodies by being switched to the first switching state in which the sheet feeding roller is in contact with the rotating body, and is fed by both sheet feeding rotating bodies in a state in which the sheet retainer is released. It is nipped and conveyed in the paper direction. In this case, since the conveying paper has a small distance from the stacked paper and is in contact with the next or lower stacked paper, the influence of static electricity, slipperiness, and friction resistance is small.
【0014】即ち、用紙相互の密着性・静電気・摩擦抵
抗・すべり性等のファクターの1枚分離給紙性能への影
響を少なくして、重送現象を生じさせずに用紙を確実に
1枚分離給紙させることが可能となる。
That is, factors such as adhesion between sheets of paper, static electricity, friction resistance, and slippage are reduced in influence on the performance of single-sheet separation and feeding, and one sheet of paper is surely fed without causing a double feeding phenomenon. It is possible to separate and feed the sheets.
【0015】[0015]
【実施例】図1・図2は一実施例としての、画像形成装
置等における積載用紙の1枚分離給紙機構を示したもの
で、図1は機構の要部の側面図、図2は一部切り欠き平
面図である。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show, as an embodiment, a single-sheet separating / feeding mechanism for stacked sheets in an image forming apparatus or the like. FIG. 1 is a side view of a main part of the mechanism, and FIG. It is a partially cutaway plan view.
【0016】(1)機構構成 1・2(図2)は1枚分離給紙機構の手前側と奥側のシ
ャーシー側板、3はこの側板1・2間に配設した用紙載
置台であり、この載置台上に転写紙・記録紙等の用紙P
が所定に積載セットされる。
(1) Mechanism configuration 1.2 (FIG. 2) is a chassis side plate on the front side and the back side of the one-sheet separating / feeding mechanism, and 3 is a sheet placing table disposed between the side plates 1 and 2. Paper P such as transfer paper and recording paper is placed on this mounting table.
Are loaded and set in a predetermined manner.
【0017】この用紙載置台3は本実施例の場合は不図
示の昇降動機構により、或は押し上げばね機構により持
ち上げ付勢されて、積載用紙Pの最上面が積載用紙Pの
消費減少にかかわらず、所定の給紙可能高さレベル範囲
に保たれる。
In the case of the present embodiment, the sheet mounting table 3 is urged by an elevating mechanism (not shown) or by a pushing-up spring mechanism so that the uppermost surface of the stacked sheets P may reduce the consumption of the stacked sheets P. Instead, it is maintained within a predetermined height level range in which paper can be fed.
【0018】23・7は用紙載置台3の先端部前方(台
3よりも給紙方向下流側)に、手前側と奥側のシャーシ
ー側板1・2間に互いに上下に間隔をおいて定置配設し
た並行一対の横軸、5・6は該一対の横軸の下側横軸7
の手前端側にスラスト移動止めして回転自由に配設し
た、同心一体のギヤ(第2ギア)とプーリ(第1プー
リ)、21・22は上側横軸23の手前端側にスラスト
移動止めして回転自由に配設した、同心一体のギヤ(第
3ギヤ)とプーリ(第3プーリ)である。そして前記の
第2ギヤ5とこの第3ギヤ21は互いに噛合している。
The numeral 23.7 is fixedly arranged in front of the front end of the paper placing table 3 (downstream from the table 3 in the sheet feeding direction) and vertically spaced from each other between the chassis side plates 1 and 2 on the front side and the back side. A pair of parallel horizontal shafts 5 and 6 are provided on the lower horizontal shaft 7 of the pair of horizontal shafts.
A thrust concentric gear (second gear) and a pulley (first pulley) 21 and 22 are arranged on the front end side of the upper horizontal shaft 23 to prevent the thrust movement on the front end side of the upper horizontal shaft 23. And a concentric gear (third gear) and a pulley (third pulley) that are rotatably arranged. The second gear 5 and the third gear 21 mesh with each other.
【0019】Mは給紙モータ、4はこのモータMの回転
軸に固着した駆動ギヤ(第1ギヤ)であり、この第1ギ
ヤ4は前記の第2ギヤ5に噛合している。
M is a paper feed motor, and 4 is a drive gear (first gear) fixed to the rotating shaft of the motor M. The first gear 4 is meshed with the second gear 5.
【0020】12・12は前記の下側横軸7の手前端側
と奥端側にそれぞれスラスト移動止めして該横軸7を中
心に上下回動自由に、かつ用紙載置台方向に向けて配設
した手前側と奥側の並行一対の下側給紙ローラアーム、
10はこの並行一対のアーム12・12の先端部間に、
下側横軸7と並行に、かつ回転自由に軸受保持させて配
設した下側給紙ローラ軸、11はこの軸10に固着した
第2の給紙用回転体としての下側給紙ローラである。
Reference numerals 12 and 12 denote thrust movement stoppers at the front end side and the rear end side of the lower horizontal shaft 7, respectively, so that the lower horizontal shaft 7 can be freely rotated up and down about the horizontal shaft 7 and toward the sheet stacking table. A pair of lower paper feed roller arms arranged in parallel on the front side and the back side,
10 is between the tips of the pair of parallel arms 12, 12.
A lower paper feed roller shaft arranged in parallel with the lower horizontal shaft 7 and rotatably bearing-supported, and a lower paper feed roller 11 fixed to the shaft 10 as a second paper feed rotary member. Is.
【0021】9は上記の下側給紙ローラ軸10の手前端
側に固着したプーリ(第2プーリ)であり、前記の第1
プーリ6とこの第2プーリ9との間にベルト8を懸回張
設してある。
Reference numeral 9 designates a pulley (second pulley) fixed to the front end side of the lower paper feed roller shaft 10 described above.
A belt 8 is suspended around the pulley 6 and the second pulley 9.
【0022】15は下側給紙ローラアーム12の引き上
げばねであり、手前側と奥側の各アーム12に植設した
ばね掛けピン13と、手前側と奥側の各シャーシー側板
1・2に植設したばね掛けピン14との間に張設してあ
り、常時は下側給紙ローラアーム12を下側横軸7を中
心に、図1の実線示のように、下側給紙ローラ11の上
面側が後述する第1の給紙用回転体としての上側給紙ロ
ーラ26の下面側に突き当って受止められた第1切換え
状態になるまで引き上げ回動している。
Numeral 15 is a pull-up spring for the lower paper feed roller arm 12, which is attached to the spring hooking pins 13 implanted in the front and rear arms 12, and the front and rear chassis side plates 1 and 2. The lower paper feed roller arm 12 is usually stretched between the planted spring hooking pin 14 and the lower paper feed roller arm 12 is centered on the lower horizontal shaft 7 as shown by the solid line in FIG. The upper surface of 11 is pulled up and rotated until it comes into a first switching state in which it is abutted against the lower surface of an upper paper feed roller 26 serving as a first paper feed rotary member to be described later.
【0023】16は手前側と奥側の1対の第1ソレノイ
ド(電磁ソレノイドープランジャ)であり、その各進退
プランジャ17をリンク18を介して手前側と奥側の各
下側給紙ローラアーム12に連結してある。
Reference numeral 16 denotes a pair of first solenoids (electromagnetic solenoid plungers) on the front side and the back side, and each advancing / retreating plunger 17 thereof is linked via links 18 to the lower side sheet feeding roller arms on the front side and the back side. It is connected to 12.
【0024】この第1ソレノイド16がON(通電)さ
れると、プランジャ17が後退動して下側給紙ローラア
ーム12がばね15に抗して下側横軸7を中心に図1の
2点鎖線示のように引き下げ回動され、下側給紙ローラ
11の下面側が用紙載置台3上の積載セット用紙Pの上
面に押し当てられた第2切換え状態となる。
When the first solenoid 16 is turned on (energized), the plunger 17 moves backward so that the lower paper feed roller arm 12 resists the spring 15 and moves around the lower horizontal shaft 7 as shown in FIG. It is pulled down and rotated as shown by the dotted line, and the lower side of the lower paper feed roller 11 is in the second switching state in which it is pressed against the upper surface of the stacked set sheets P on the sheet stand 3.
【0025】また該第1ソレノイド16がOFF(非通
電)されると、下側給紙ローラアーム12は引き上げば
ね15により再び持ち上げ回動されて、下側給紙ローラ
11が図1の実線示のように上側給紙ローラ26の下面
側に突き当って受止められた第1切換え状態に復帰す
る。
When the first solenoid 16 is turned off (not energized), the lower paper feeding roller arm 12 is lifted and rotated again by the lifting spring 15, and the lower paper feeding roller 11 is shown by the solid line in FIG. As described above, the first switching state in which the lower surface side of the upper sheet feeding roller 26 is abutted and received is restored.
【0026】27は用紙載置台3の先端部側の上方にお
いて、手前側と奥側のシャーシー側板1・2間に、前記
の上側横軸23と並行に、かつ回転自由に軸受保持させ
て定置配設した上側給紙ローラ軸であり、前記の第1給
紙用回転体としての上側給紙ローラ26はこの軸27に
固着してある。
Numeral 27 designates a fixed position above the front end side of the sheet loading table 3 between the chassis side plates 1 and 2 on the front side and the back side in parallel with the upper horizontal shaft 23 and by rotatably supporting the bearing. The upper paper feed roller shaft is provided, and the upper paper feed roller 26 as the first paper feed rotary member is fixed to the shaft 27.
【0027】25は上記の上側給紙ローラ軸27の手前
端側に固着したプーリ(第4プーリ)であり、前記の第
3プーリ22とこの第4プーリ25との間にベルト24
を懸回張設してある。
Reference numeral 25 denotes a pulley (fourth pulley) fixed to the front end side of the upper paper feed roller shaft 27, and a belt 24 is provided between the third pulley 22 and the fourth pulley 25.
Is suspended.
【0028】30は上側給紙ローラ軸27と略同じ高さ
位置で、かつ上側給紙ローラ26よりも給紙方向上流側
の位置に、手前側と奥側のシャーシー側板1・2間に配
設した横軸、31はこの横軸30を中心に上下回動自由
に配設した可動の用紙ガイド板である。この用紙ガイド
板31は横軸30の位置から給紙方向上流側に張り出さ
せ、かつ下方へ湾曲させてあり、その自由端部に用紙押
え手段としてのゴム板32を取り付け保持させてある。
Reference numeral 30 denotes a position approximately the same height as the upper paper feed roller shaft 27 and at a position upstream of the upper paper feed roller 26 in the paper feeding direction, between the chassis side plates 1 and 2 on the front and back sides. The horizontal axis 31 provided is a movable paper guide plate which is arranged so as to be vertically rotatable about the horizontal axis 30. The paper guide plate 31 projects from the position of the horizontal axis 30 to the upstream side in the paper feeding direction and is bent downward, and a rubber plate 32 as a paper pressing means is attached and held at its free end.
【0029】35は上記の可動の用紙ガイド板31の引
き上げばねであり、該ガイド板31の手前側と奥側の各
縁部に設けたばね掛け部33と、手前側と奥側の各シャ
ーシー側板1に植設したばね掛けピン34との間に張設
してあり、常時は該ガイド板31を横軸30を中心に、
後述する手前側と奥側の1対の第2ソレノイド36のプ
ランジャ37が引き上げ終点まで持ち上げられてそれ以
上の引き上げが阻止されるまで引き上げ回動している。
この状態において該ガイド板31の自由端部に設けたゴ
ム板32は積載用紙Pの上面から上方に非接触に持ち上
げられて逃げている第1切換え状態となっている。
Reference numeral 35 denotes a pull-up spring for the movable paper guide plate 31, which includes spring hooking portions 33 provided at respective front and rear edges of the guide plate 31, and front and rear chassis side plates. 1 is stretched between the spring hooking pin 34 and the spring hooking pin 34, and the guide plate 31 is normally placed around the horizontal axis 30.
The plunger 37 of the pair of second solenoids 36 on the front side and the back side, which will be described later, is lifted and rotated until the plunger 37 is lifted to the end point of pulling up and further pulling up is prevented.
In this state, the rubber plate 32 provided at the free end portion of the guide plate 31 is in the first switching state in which it is lifted up from the upper surface of the stacked sheets P in a non-contact manner and escapes.
【0030】前記の手前側と奥側の1対の第2ソレノイ
ド36は、その各進退プランジャ37の上方延長先端部
を可動の用紙ガイド板31の手前側と奥側の各縁部にピ
ン38で枢着して連結してある。この第2ソレノイド3
6がONされると、プランジャ37が後退してガイド板
31がばね35に抗して横軸30を中心に図1の2点鎖
線示のように引き下げ回動され、該ガイド板31の自由
端部に設けたゴム板32が用紙載置台3上の積載用紙P
の上面に押し当った第2切換え状態となる。
The pair of second solenoids 36 on the front side and the rear side are provided with pins 38 on the front and rear edges of the movable sheet guide plate 31 with the upward extension tips of the respective forward and backward plungers 37. It is pivotally connected at. This second solenoid 3
When 6 is turned on, the plunger 37 retreats and the guide plate 31 is pulled down and rotated around the horizontal shaft 30 against the spring 35 as shown by the chain double-dashed line in FIG. The rubber plate 32 provided at the end portion of the stacked sheets P on the sheet mounting table 3
The second switching state is brought into contact with the upper surface of the.
【0031】ゴム板32の積載用紙上面に対する押し当
り位置は、前記の下側給紙ローラ11が下降動してその
下面側が積載用紙Pの上面に対して押し当る位置よりも
給紙方向上流側の位置である。
The position where the rubber plate 32 is pressed against the upper surface of the stacked paper is upstream of the position in which the lower paper feed roller 11 is moved downward and the lower surface of the rubber plate 32 is pressed against the upper surface of the stacked paper P in the paper feeding direction. Is the position.
【0032】第2ソレノイド36がOFFされると、ガ
イド板31は引き上げばね35により再び持ち上げ回動
されて、ゴム板32が積載用紙Pの上面から離れる。
When the second solenoid 36 is turned off, the guide plate 31 is lifted and rotated again by the pull-up spring 35, and the rubber plate 32 is separated from the upper surface of the stacked sheets P.
【0033】39・40は1枚分離給紙された用紙を不
図示の作像機構部へ向けて案内するシートパス41を構
成する上側と下側の用紙ガイド板である。
Numerals 39 and 40 are upper and lower sheet guide plates which constitute a sheet path 41 for guiding a sheet which has been separated and fed one by one toward an image forming mechanism section (not shown).
【0034】上側の用紙ガイド板39は、上側給紙ロー
ラ26と該ローラ26の下面側に突き当った状態の下側
給紙ローラ11との圧接ニップ部Nよりもやや上の高さ
位置にあり、その給紙方向上流側の端部39aは前記の
可動の用紙ガイド板31の横軸側端部の近傍まで延長位
置させてある。また上側給紙ローラ26はこの上側の用
紙ガイド板39の面に形成した透孔39bから該ガイド
板39の内側に下面部を臨ませてある。
The upper paper guide plate 39 is located at a position slightly higher than the pressure contact nip portion N between the upper paper feed roller 26 and the lower paper feed roller 11 in contact with the lower surface of the roller 26. The end 39a on the upstream side in the sheet feeding direction is extended to the vicinity of the end on the horizontal axis side of the movable sheet guide plate 31. The upper paper feed roller 26 has a lower surface facing the inside of the guide plate 39 through a through hole 39b formed in the surface of the upper paper guide plate 39.
【0035】下側の用紙ガイド板40の給紙方向上流側
部分は下方へ屈曲させて上側の用紙ガイド板39との間
隔を大きくし該ガイド板40の給紙方向上流側の端部4
0aが、積載用紙Pの上面に下降動して押し当った状態
にある下側給紙ローラ11よりも給紙方向下流側で、か
つ該下側給紙ローラ11の近傍に位置するように配設し
てある。
The upstream side portion of the lower sheet guide plate 40 in the sheet feeding direction is bent downward to increase the gap between the lower sheet guide plate 40 and the upper sheet guide plate 39, and the end portion 4 of the guide plate 40 on the upstream side in the sheet feeding direction.
0a is arranged so as to be positioned downstream of the lower paper feed roller 11 in the state of being lowered and pressed against the upper surface of the stacked paper P and in the vicinity of the lower paper feed roller 11. It is set up.
【0036】42a・42bは上側と下側の用紙ガイド
板39・40の先端部39a・40aの位置に互いに対
向させて配設した用紙検知手段としての発光器と受光器
で、上側と下側の用紙ガイド板39・40の先端部39
a・40a間の用紙入口部に発光器42aから受光器4
2bへ至る光線光路42cを形成させている。
Reference numerals 42a and 42b denote light emitters and light receivers as sheet detection means, which are arranged at the positions of the leading ends 39a and 40a of the upper and lower sheet guide plates 39 and 40 so as to face each other. Paper guide plate 39/40 tip 39
a light receiving device 4 from the light emitting device 42a to the paper inlet portion between a and 40a.
A light beam optical path 42c reaching 2b is formed.
【0037】上記において、下側給紙ローラアーム12
・ばね15・第1ソレノイド16が、第2の給紙用回転
体としての下側給紙ローラ11を第1の給紙用回転体と
しての上側給紙ローラ26と積載用紙Pとの間に揺動さ
せて、上側給紙ローラ26に接触させた第1切換え状態
と、積載用紙P面に接触させた第2切換え状態に転換さ
せる移動手段である。
In the above, the lower paper feed roller arm 12
The spring 15 and the first solenoid 16 connect the lower paper feed roller 11 serving as the second paper feed rotary member between the upper paper feed roller 26 serving as the first paper feed rotary member and the stacked paper P. It is a moving unit that swings to switch between a first switching state in which the upper sheet feeding roller 26 is brought into contact with the upper sheet feeding roller 26 and a second switching state in which the sheet P is placed in contact with the upper sheet feeding roller 26.
【0038】また、給紙モータM・ギヤ4・同5・プー
リ6・ベルト8・プーリ9・軸10が、前記第1切換え
状態において第1と第2の給紙用回転体である上側と下
側の給紙ローラ26・11との圧接ニップ部Nで用紙を
給紙方向に挟持搬送する方向に少なくとも第2の給紙用
回転体としての下側給紙ローラ11を回転させる駆動手
段である。
Further, the paper feed motor M, the gears 4, the gear 5, the pulley 6, the belt 8, the pulley 9, and the shaft 10 are the upper and lower sides of the first and second paper feed rotary bodies in the first switching state. By a driving means for rotating at least the lower paper feed roller 11 as the second paper feed rotary member in the direction of nipping and conveying the paper in the paper feed direction at the pressure contact nip portion N with the lower paper feed rollers 26 and 11. is there.
【0039】第1の給紙用回転体としての上側給紙ロー
ラ26は第2の給紙用回転体としての下側給紙ローラ1
1に従動回転するニップローラとすることもできるが、
本実施例ではこの上側給紙ローラ26も給紙モータM・
ギヤ4・同5・同21・プーリ22・ベルト24・プー
リ25・軸27で回転駆動させている。
The upper paper feed roller 26 as the first paper feed rotator is the lower paper feed roller 1 as the second paper feed rotator.
Although it is possible to use a nip roller that is driven and rotated by 1,
In this embodiment, the upper paper feed roller 26 is also a paper feed motor M.
The gears 4, 5, 21, pulley 22, belt 24, pulley 25, and shaft 27 are rotationally driven.
【0040】(2)用紙1枚分離給紙動作 .図1は給紙待機状態時であり、このときは第1ソレ
ノイド16はOFFであり、下側給紙ローラアーム12
がばね15により引き上げ回動されて、下側給紙ローラ
11の上面側が上側給紙ローラ26の下面側に突き当っ
た第1切換え状態に保たれている。
(2) Sheet feeding operation for separating one sheet FIG. 1 shows the paper feed standby state, in which the first solenoid 16 is off and the lower paper feed roller arm 12
Is pulled up and rotated by the spring 15, and the upper side of the lower paper feed roller 11 is kept in the first switching state in which it hits the lower surface of the upper paper feed roller 26.
【0041】第2ソレノイド36もOFFであり、可動
ガイド板31がばね35により引き上げ回動されて、ゴ
ム板32が積載用紙Pの上面から上方へ逃げ離れた第1
切換え状態に保たれている。
The second solenoid 36 is also off, the movable guide plate 31 is pulled up and rotated by the spring 35, and the rubber plate 32 escapes upward from the upper surface of the stacked sheets P.
It is kept switched.
【0042】給紙モータMは駆動停止状態に保たれてい
る。
The paper feed motor M is kept in a drive stopped state.
【0043】用紙検知手段42a・42bは光路42c
が用紙で遮られておらず開放されていてON(紙なし)
の状態にある。
The paper detecting means 42a and 42b are provided with an optical path 42c.
Is open without being blocked by the paper (no paper)
Is in the state of.
【0044】.不図示の制御回路に給紙スタート信号
が入力すると、給紙モータMがONとなり、該モータM
の駆動力が第1ギヤ4→第2ギヤ5→第1プーリ6→ベ
ルト8→第2プーリ9→下側給紙ローラ軸10の経路で
下側給紙ローラ11に伝達されて、該下側給紙ローラ1
1が図3のように給紙方向(反時計方向)に回転駆動状
態になる。
.. When a paper feed start signal is input to a control circuit (not shown), the paper feed motor M is turned on and the motor M
Driving force is transmitted to the lower paper feed roller 11 through the path of the first gear 4 → second gear 5 → first pulley 6 → belt 8 → second pulley 9 → lower paper feed roller shaft 10, Side paper feed roller 1
1 is driven to rotate in the sheet feeding direction (counterclockwise direction) as shown in FIG.
【0045】また、第1ギヤ4→第2ギヤ5→第3ギヤ
21→第3プーリ22→ベルト24→第4プーリ25→
上側給紙ローラ軸27の経路で上側給紙ローラ26に伝
達されて、該上側給紙ローラ26が図3のように給紙方
向(時計方向)に回転駆動状態になる。
Further, the first gear 4 → the second gear 5 → the third gear 21 → the third pulley 22 → the belt 24 → the fourth pulley 25 →
It is transmitted to the upper paper feed roller 26 through the path of the upper paper feed roller shaft 27, and the upper paper feed roller 26 is driven to rotate in the paper feed direction (clockwise direction) as shown in FIG.
【0046】そして上記の給紙モータMのONと同時的
に第2ソレノイド36がONとなり、可動の用紙ガイド
板31がばね35に抗して横軸30を中心に引き下げ回
動されて図3のようにゴム板32が用紙載置台3上の積
載用紙Pの上面に押し当った第2切換え状態となって用
紙押えがなされる。
The second solenoid 36 is turned on at the same time when the paper feed motor M is turned on, and the movable paper guide plate 31 is pulled down around the horizontal shaft 30 against the spring 35 and rotated. As described above, the rubber plate 32 is pressed against the upper surface of the stacked sheets P on the sheet mounting table 3 to enter the second switching state, and the sheet is pressed.
【0047】.この用紙押え動作(第2ソレノイド3
6−ON時点)から少し遅延α(図10)して、第1ソ
レノイド16がONになり、下側給紙ローラアーム12
がばね15に抗して下側横軸7を中心に引き下げ回動さ
れて図4のように下側給紙ローラ11の下面が積載用紙
Pの上面に押し当った第2切換え状態となる。
.. This paper pressing operation (second solenoid 3
After a slight delay α (FIG. 10) from 6-ON time), the first solenoid 16 is turned on, and the lower paper feed roller arm 12
Is pulled down and rotated about the lower horizontal shaft 7 against the spring 15, and the lower surface of the lower paper feed roller 11 is pressed against the upper surface of the stacked paper P as shown in FIG.
【0048】給紙モータMによる下側及び上側の給紙ロ
ーラ11・26の給紙方向である前記の反時計方向・時
計方向への各回転駆動は、下側給紙ローラ11が上記の
ように引き下げ動作されても支障なく続行される。
The rotation of the lower and upper paper feed rollers 11, 26 by the paper feed motor M in the counterclockwise and clockwise directions as described above is performed by the lower paper feed roller 11 as described above. Even if it is pulled down, it will continue without any problems.
【0049】上記の下側給紙ローラ11の引き下げによ
る該ローラ11の下面側の積載用紙上面への押し当りに
より、積載用紙Pの最上位用紙P1 には給紙方向Aとは
逆方向Bへの逆搬送力が作用し、積載用紙Pの最上位用
紙P1 は下側給紙ローラ11の用紙押し当り部と、ゴム
板32の用紙押し当り部との間に図5のようにたわみル
ープP´を生じながら逆搬送Bされていく。
When the lower side paper feed roller 11 is pulled down and the lower surface of the roller 11 is pressed against the upper surface of the stacked paper, the uppermost paper P 1 of the stacked paper P is fed in the direction B opposite to the paper feeding direction A. As a result, the uppermost sheet P 1 of the stacked sheets P is bent between the sheet pressing portion of the lower paper feed roller 11 and the sheet pressing portion of the rubber plate 32 as shown in FIG. The reverse conveyance B is performed while forming the loop P '.
【0050】.そして逆搬送された該用紙P1 の先端
Paが下側給紙ローラ11の下を抜け出ると、該用紙P
1 の先端Paが下側給紙ローラ11の周面に接して、該
ローラ11の給紙方向回転と、用紙たわみループP´の
剛性反力で、該用紙P1 の先端部側が図6の2点鎖線示
の状態から実線示のように下側給紙ローラ11の下側か
ら該ローラ11を乗り越えて該ローラ11の上側へ移行
して、上側と下側の用紙ガイド板39・40の先端部間
の用紙入口部から該両ガイド板39・40間に進入す
る。
.. When the leading edge Pa of the reversely conveyed sheet P 1 passes under the lower sheet feed roller 11, the sheet P 1 is conveyed.
The leading end Pa of 1 is in contact with the peripheral surface of the lower sheet feeding roller 11, and the leading end side of the sheet P 1 is shown in FIG. From the state shown by the two-dot chain line, as shown by the solid line, from the lower side of the lower paper feed roller 11 to get over the roller 11 and move to the upper side of the roller 11, the upper and lower paper guide plates 39 and 40 The sheet enters between the guide plates 39 and 40 from the sheet inlet section between the leading ends.
【0051】即ち、積載用紙Pの最上位の用紙P1 が、
その先端部側が下側給紙ローラ11の下側から上側へ移
行して次位以下の用紙P2 ・P3 …から1枚分離された
状態となる。
That is, the uppermost sheet P 1 of the stacked sheets P is
The leading end side of the lower paper feed roller 11 moves from the lower side to the upper side, and one sheet is separated from the second and lower papers P 2 , P 3, ...
【0052】.上記の最上位用紙P1 の先端部側が、
下側給紙ローラ11の下側から上側へ移行して上側と下
側の用紙ガイド板39・40の先端部間の用紙入口部か
ら該両ガイド板39・40間へ進入したことが、該最上
位用紙P1 の先端部で用紙検知手段としての発光器42
aと受光器42bとの間の光線光路42cが遮断(セン
サ−OFF)されることで検知される。
.. The top end side of the above-mentioned top paper P 1 is
The fact that the lower sheet feeding roller 11 has moved from the lower side to the upper side and has entered between the upper and lower sheet guide plates 39 and 40 from the sheet inlet portion between the both guide plates 39 and 40 A light emitter 42 as a paper detecting means at the leading end of the topmost paper P 1.
It is detected when the light beam optical path 42c between a and the light receiver 42b is blocked (sensor-OFF).
【0053】その検知がなされた瞬間、第1ソレノイド
16がOFFとなり、下側給紙ローラアーム12がばね
15で引き上げ回動される。これにより下側給紙ローラ
11が該ローラ11の上側へ移行している最上位用紙P
1 の先端部側を乗せたまま上昇して上側給紙ローラ26
の下面側に押し当った第1切換え状態になり、図7のよ
うに最上位用紙P1 の先端部が上側給紙ローラ26の下
面側と下側給紙ローラ11上面側との圧接ニップ部Nに
挟持された状態となる。
At the moment when the detection is made, the first solenoid 16 is turned off, and the lower paper feed roller arm 12 is pulled up and rotated by the spring 15. As a result, the lowermost paper feed roller 11 moves to the upper side of the uppermost paper P.
1 and the upper side of the upper feed roller 26
The first switching state in which the uppermost sheet of paper P 1 is pressed against the lower side of the upper sheet feeding roller 26 is brought into contact with the lower surface of the upper sheet feeding roller 26 and the upper surface of the lower sheet feeding roller 11 as shown in FIG. It is sandwiched between N.
【0054】ここで、下側給紙ローラ11の下面との接
触で逆搬送Bされた最上位用紙P1の先端Paが該ロー
ラ11の下を抜けると、該ローラ11は次位の用紙P2
の面に接触し、この時点から第1ソレノイド16のOF
Fで該ローラ11が引き上げられるまでの間、次位の用
紙P2 に逆搬送力が作用するが、該用紙P2 に該ローラ
11が接触している時間は極短く実際の逆搬送量は少な
く、形成されるループは小さくて、該用紙P2 の先端が
最上位用紙P1 のように該ローラ11の下を抜け出るま
でには至らず、そして形成ループはローラ11が引き上
げられて該用紙P2 とは非接触になることで解消され
る。
Here, when the leading edge Pa of the uppermost sheet P 1 reversely conveyed by contact with the lower surface of the lower sheet feeding roller 11 passes under the roller 11, the roller 11 moves to the next sheet P. 2
Of the first solenoid 16 from this point
The reverse conveying force acts on the next paper P 2 until the roller 11 is pulled up by F, but the time during which the roller 11 is in contact with the paper P 2 is extremely short and the actual reverse conveyance amount is The number of loops formed is small, and the leading edge of the sheet P 2 does not come out below the roller 11 like the uppermost sheet P 1 , and the forming loop causes the roller 11 to be pulled up. It is eliminated by being out of contact with P 2 .
【0055】.第1ソレノイド16がOFFとなった
時点から、下側給紙ローラ11が引き上げられて最上位
用紙P1 の先端部が上側と下側の給紙ローラ26・11
との圧接ニップ部Nにしっかりと挟持された状態に至る
に要する所定の短時間β(図10)後に、第2ソレノイ
ド36がOFFとなり、可動の用紙ガイド板31がばね
35により引き上げ回動されて、ゴム板32による積載
用紙Pの押えが解除される。
.. From the time when the first solenoid 16 is turned off, the lower paper feed roller 11 is pulled up, and the leading end of the uppermost paper P 1 is on the upper and lower paper feed rollers 26 and 11.
After a predetermined short time β (FIG. 10) required to reach a state where the sheet is firmly held in the pressure contact nip portion N, the second solenoid 36 is turned off, and the movable sheet guide plate 31 is pulled up and rotated by the spring 35. Then, the pressing of the stacked sheets P by the rubber plate 32 is released.
【0056】.上記のように上側と下側の給紙ローラ
26・11の圧接ニップ部Nに先端部を挟持された状態
となった最上位用紙P1 は、上記両給紙ローラ26・1
1の引き続く給紙方向への回転力と、ゴム板32による
押えの解除で、図8のように給紙ローラ対26・11の
挟持搬送力にて上側と下側の用紙ガイド板39・40間
のシートパス41を通って作像機構部へ搬送されてい
く。
.. As described above, the uppermost sheet P 1 in which the leading end portions are sandwiched between the pressure contact nip portions N of the upper and lower sheet feeding rollers 26.
As a result of the rotation force of 1 in the sheet feeding direction and the release of the pressing by the rubber plate 32, the upper and lower sheet guide plates 39 and 40 are sandwiched by the nip conveying force of the sheet feed roller pair 26 and 11 as shown in FIG. It is conveyed to the image forming mechanism section through the sheet path 41 between them.
【0057】.そして該用紙P1 の搬送が進行して該
用紙の後端Pb(図9)が発光器42aと受光器42b
の光線光路42c位置を通過して図9のように光路42
cが開放されることで、搬送用紙P1 の後端Pbの該検
知部通過(センサ−ON)が検知された後、該搬送用紙
1 の後端Pbが上側と下側の給紙ローラ26・11の
圧接ニップ部Nを通過し終わるに要する所定時間γ(図
10)が経過した後に給紙モータMの駆動が停止され、
機構は次の給紙スタート信号が制御回路へ入力されるま
で給紙待機状態に保たれる。
.. Then, as the conveyance of the sheet P 1 progresses, the rear end Pb (FIG. 9) of the sheet P 1 emits light from the light emitter 42a and the light receiver 42b.
The light path 42c of the
By the opening of c, the passage (sensor-ON) of the trailing edge Pb of the conveyed sheet P 1 is detected, and then the trailing edge Pb of the conveyed sheet P 1 is set to the upper and lower paper feed rollers. The drive of the sheet feeding motor M is stopped after a predetermined time γ (FIG. 10) required to finish passing through the pressure contact nip portion N of 26.11 is passed,
The mechanism is kept in the paper feed standby state until the next paper feed start signal is input to the control circuit.
【0058】図10は上記〜の、給紙モータM、第
1ソレノイド16、第2ソレノイド36、用紙検知手段
42a・42bの動作タイミングチャートを示してい
る。
FIG. 10 shows an operation timing chart of the paper feed motor M, the first solenoid 16, the second solenoid 36, and the paper detection means 42a and 42b described above.
【0059】上記の〜の動作サイクルが給紙スター
ト信号Sの制御回路への入力毎に実行されて用紙載置台
3上の積載用紙Pの1枚分離給紙が順次に実行される。
用紙載置台3は前述したように積載用紙Pの最上面が積
載用紙Pの消費減少にかかわらず所定の給紙可能高さレ
ベル範囲に保たれるように逐次に上昇する。用紙載置台
3上の積載用紙Pが全て消費されると不図示の積載用紙
センサが作動してエンプティー表示動作がなされる。
The above-described operation cycles (1) to (5) are executed every time the paper feed start signal S is input to the control circuit, so that the stacked sheets P on the paper tray 3 are separated and fed one by one.
As described above, the sheet mounting table 3 is sequentially raised so that the uppermost surface of the stacked sheets P is kept within a predetermined feedable height level range regardless of the reduction in consumption of the stacked sheets P. When all of the stacked sheets P on the sheet mounting table 3 are consumed, a stacked sheet sensor (not shown) is activated and an empty display operation is performed.
【0060】また連続給紙モードの場合は、図11のよ
うに給紙モータMを、給紙スタート信号Sから所定枚数
分の用紙(図11は3枚連続給紙)の連続1枚分離給紙
が終了するまで連続回転状態にするシーケンスにするこ
ともできる。
In the continuous paper feed mode, as shown in FIG. 11, the paper feed motor M is used to separate and feed a predetermined number of papers (three continuous paper feeds in FIG. 11) from the paper feed start signal S. It is also possible to have a sequence of continuously rotating the paper until the paper is finished.
【0061】このシーケンスは一の用紙の給紙がなさ
れ、その後端の検知手段42a・42b位置の通過が検
知されたら、第2ソレノイド36がONしてゴム板32
による積載用紙Pの押え込みがなされ、次いで第1ソレ
ノイド16がONして下側給紙ローラ11が積載用紙P
の上面に接する動作を所定枚数の用紙の連続給紙が終わ
るまで連続して繰り返す。
In this sequence, when one sheet is fed and the passage of the trailing edge detecting means 42a and 42b is detected, the second solenoid 36 is turned on and the rubber plate 32 is turned on.
The stacked paper P is pressed down by, and then the first solenoid 16 is turned on so that the lower paper feed roller 11 moves the stacked paper P.
The operation of contacting the upper surface of is continuously repeated until the continuous feeding of a predetermined number of sheets is completed.
【0062】上記の1枚分離給紙機構の用紙1枚分離
は、前述したように、積載用紙Pを押え手段としてのゴ
ム板32で押えた状態において、その押え部よりも給紙
方向下流側の積載用紙Pに下側給紙ローラ11を接触さ
せて最上位用紙P1 を逆搬送Bさせ下側給紙ローラ11
とゴム板32との間の最上位用紙P1 部分にループP´
を形成させて該最上位用紙P1 の先端部を下側給紙ロー
ラ11の下側から上側に乗り越えさせることでなされ、
この場合、上記のループP´で最上位用紙P1 と次位の
用紙P2 の隙間が大きくなって最上位用紙P1 と次位の
用紙P2 との密着性がなくなり、最上位用紙P1 の確実
な1枚分離がなされる。
As described above, when the stacked sheets P are held by the rubber plate 32 as the holding means, the sheet separating operation of the above-described one-sheet separating / feeding mechanism is downstream of the holding portion in the sheet feeding direction. The lower paper feed roller 11 is brought into contact with the stacked paper P of No. 1 and the uppermost paper P 1 is reversely conveyed B to the lower paper feed roller 11
Loop P'on the topmost sheet P 1 between the rubber plate 32 and the rubber plate 32.
Is formed and the leading end of the uppermost sheet P 1 is passed over from the lower side to the upper side of the lower paper feed roller 11.
In this case, the gap of the sheet P 2 of the uppermost sheet P 1 and the next order in the above loop P'becomes larger eliminates the adhesion between the uppermost paper sheet P 1 and the next order of the sheet P 2, the uppermost sheet P reliable one separation 1 is made.
【0063】そして、下側給紙ローラ11を下側から上
側に乗り越えて1枚分離された最上位用紙P1 は、次い
で下側給紙ローラ11が積載用紙P側から上側給紙ロー
ラ26側に揺動移動されることで積載用紙P側から更に
持ち上げられて上側と下側の給紙ローラ26・11の間
に挟持され、用紙押えが解除された状態において該両給
紙ローラ26・11により給紙方向に挟持搬送されてい
き、この場合、該搬送用紙P1 は次位以下の積載用紙と
接する面が少ないので、用紙相互の静電気・すべり性・
摩擦抵抗の影響が少ない。
Then, the uppermost sheet P 1 which has passed the lower sheet feeding roller 11 from the lower side to the upper side and is separated into one sheet, the lower sheet feeding roller 11 then moves from the stacked sheet P side to the upper sheet feeding roller 26 side. When the paper feed rollers 26 and 11 are lifted from the side of the stacked sheets P and are sandwiched between the upper and lower paper feed rollers 26 and 11, and the paper retainer is released. The paper P 1 is pinched and conveyed in the paper feeding direction by the paper, and in this case, since the paper P 1 has a small number of surfaces that come in contact with stacked papers of the second or lower order, static electricity, slippage,
Less affected by frictional resistance.
【0064】即ち、用紙相互の密着性・静電気・摩擦抵
抗・すべり性等のファクターの1枚分離給紙性能への影
響を少なくして、重送現象を生じさせずに用紙を確実に
1枚分離給紙させることが可能な信頼性の高い1枚分離
給紙機構である。
That is, factors such as adhesion between sheets of paper, static electricity, frictional resistance, slippage, etc. are less affected on the performance of single sheet separation and feeding, and one sheet of paper is surely fed without causing the double feeding phenomenon. This is a highly reliable single-sheet separating / feeding mechanism capable of separating and feeding.
【0065】(3)他の実施例 用紙押え手段としてのゴム板32は図12のようにロー
ラ体32aなど他の形状・形態のものにすることもでき
る。
(3) Other Embodiments The rubber plate 32 as the paper pressing means may have other shapes and forms such as the roller body 32a as shown in FIG.
【0066】図13や図14のように、用紙押え手段と
してのゴム板32やローラ体32aのそれ自体をソレノ
イド等の移動手段43で積載用紙Pの上面に対して接離
させるように構成することもできる。この場合は前述の
可動の用紙ガイド板31は固定のガイド板にする、或い
は廃止することもできる。
As shown in FIG. 13 and FIG. 14, the rubber plate 32 as the paper pressing means and the roller body 32a itself are brought into contact with and separated from the upper surface of the stacked paper P by the moving means 43 such as a solenoid. You can also In this case, the movable paper guide plate 31 may be a fixed guide plate or may be omitted.
【0067】図15のように、用紙押え手段をモータ4
4で回転駆動される回転ローラ体32bにし、用紙押え
時は回転停止状態で積載用紙Pの上面に接触させて用紙
押えを行わせ、一枚分離させた用紙P1 の搬送時は用紙
給紙方向に回転駆動させる制御構成とすることもでき
る。
As shown in FIG. 15, the paper pressing means is connected to the motor 4
4, the rotation roller body 32b is driven to rotate, and when the sheet is pressed, the upper surface of the stacked sheets P is brought into contact with the upper surface of the stacked sheets P to hold the sheet, and when the sheet P 1 separated is conveyed, the sheet is fed. It is also possible to adopt a control configuration in which it is rotationally driven in the direction.
【0068】図16は、用紙Pを装置に着脱自在の給紙
カセット(紙置カセット)50に積載収納して該カセッ
ト50を装置の給紙部に装着してある。このカセット5
0は装置に対する装着状態において、収納用紙Pの給紙
方向下流側のほぼ半部は蓋板51で覆われ、給紙方向下
流のほぼ半部の上面は開放されている。
In FIG. 16, sheets P are stacked and stored in a paper feed cassette (paper placement cassette) 50 which can be attached to and detached from the apparatus, and the cassette 50 is attached to the paper feed section of the apparatus. This cassette 5
In the state where 0 is attached to the apparatus, almost half of the storage paper P on the downstream side in the paper feeding direction is covered with the lid plate 51, and the upper surface of almost half of the paper on the downstream side in the paper feeding direction is open.
【0069】本例の場合は、回転駆動状態の下側給紙ロ
ーラ11の引き下げによる該ローラ11の下面側の積載
用紙上面への押し当たりにより、積載用紙Pの最上位用
紙P1 に給紙方向とは逆方向Bへの逆搬送力が作用する
と、積載用紙Pの最上位用紙P1 は、その後端部Pbが
給紙カセット50の後端部内壁面50aに当って用紙の
給紙方向とは反対方向への動きが規制され、下側給紙ロ
ーラ11の用紙押し当り部と、蓋板51の前縁51aと
の間にたわみループP´を生じながら逆搬送Bされてい
く。
In the case of this example, the lower paper feed roller 11 in the rotationally driven state is pulled down to press the lower surface side of the roller 11 against the upper surface of the stacked paper sheet, thereby feeding the uppermost paper sheet P 1 of the stacked paper sheet P. When the reverse conveyance force in the direction B opposite to the direction acts, the rear end Pb of the uppermost sheet P 1 of the stacked sheets P contacts the rear end inner wall surface 50 a of the sheet cassette 50, and the sheet feed direction is changed. The movement in the opposite direction is regulated, and the reverse conveyance B is performed while forming a flexible loop P'between the sheet pressing portion of the lower sheet feeding roller 11 and the front edge 51a of the cover plate 51.
【0070】以下、前述の実施例のものと同様に、逆搬
送された該用紙P1 の先端Paが下側給紙ローラ11の
下を抜け出ると、該用紙P1 の先端Paが下側給紙ロー
ラ11の周面に接して、該ローラ11の給紙方向回転
と、用紙たわみループP´の剛性反力で、該用紙P1
先端部側が下側給紙ローラ11の下側から該ローラ11
を乗り越えて該ローラ11の上側へ移行して、上側と下
側の用紙ガイド板39・40の先端部間の用紙入口部か
ら該両ガイド板39・40間に進入する。即ち、積載用
紙Pの最上位の用紙P1 が、その先端部側が下側給紙ロ
ーラ11の上側へ移行して次位以下の用紙P2 ・P3
から1枚分離された状態となる。
Thereafter, as in the case of the above-described embodiment, when the leading edge Pa of the reversely conveyed sheet P 1 passes under the lower sheet feeding roller 11, the leading edge Pa of the sheet P 1 is fed downward. In contact with the peripheral surface of the paper roller 11, the leading end side of the paper P 1 moves from the lower side of the lower paper feed roller 11 by the rotation of the roller 11 in the paper feed direction and the rigidity reaction force of the paper bending loop P ′. Roller 11
After passing over the roller 11, it moves to the upper side of the roller 11, and enters between the upper and lower sheet guide plates 39, 40 from the sheet inlet portion between the guide plates 39, 40. That is, the topmost sheet P 1 of the stacked sheets P moves to the upper side of the lower sheet feeding roller 11 with its leading end side, and the sheets P 2 , P 3, ...
1 sheet is separated from.
【0071】図17は前述図1・図2の機構を給紙部の
積載用紙の1枚分離給紙機構として用いた画像形成装置
例の概略構成を示したものである。
FIG. 17 shows a schematic structure of an example of an image forming apparatus in which the mechanism shown in FIGS. 1 and 2 is used as a single-sheet separating / feeding mechanism for the stacked sheets in the sheet feeding section.
【0072】本例の画像形成装置は電子写真プロセス利
用のレーザープリンタである。61は像担持体としての
ドラム型の電子写真感光体(感光ドラム)であり、矢示
の時計方向に所定の周速度(プロセススピード)をもっ
て回転駆動される。感光ドラム61はその回転過程で、
帯電手段としての帯電ローラ62により所定の極性・電
位の均一帯電処理を受け、次いでレーザースキャナ63
により、目的の画像情報の時系列電気デジタル画素信号
に対応して変調されたレーザー光の走査露光処理を受け
ることにより、感光ドラム61の周面に目的の画像情報
に対応した静電潜像が形成される。
The image forming apparatus of this example is a laser printer utilizing an electrophotographic process. Reference numeral 61 denotes a drum-type electrophotographic photosensitive member (photosensitive drum) as an image bearing member, which is rotationally driven in the clockwise direction indicated by an arrow at a predetermined peripheral speed (process speed). The photosensitive drum 61 rotates during its rotation,
A charging roller 62 as a charging means receives uniform charging processing of a predetermined polarity and potential, and then a laser scanner 63.
Thus, by receiving the scanning exposure processing of the laser light modulated corresponding to the time-series electric digital pixel signal of the target image information, an electrostatic latent image corresponding to the target image information is formed on the peripheral surface of the photosensitive drum 61. It is formed.
【0073】その静電潜像が現像器64によりトナー画
像として現像される。そのトナー画像が感光ドラム61
と転写手段としての転写ローラ65の圧接ニップ部(転
写部)において、該転写部へ給紙部100から1枚分離
給紙されて所定のタイミングで導入された用紙(転写
紙)Pに順次に転写されていく。
The electrostatic latent image is developed as a toner image by the developing device 64. The toner image is the photosensitive drum 61.
In the pressure contact nip portion (transfer portion) of the transfer roller 65 serving as a transfer unit, a sheet (transfer sheet) P is sequentially fed to the transfer portion from the sheet feeding portion 100 and introduced at a predetermined timing. It will be transcribed.
【0074】転写部でトナー画像の転写を受けた用紙P
は感光ドラム61面から分離されて定着器66へ搬送導
入されることでトナー像定着処理を受け、画像形成物
(プリント、コピー)として出力される。
Paper P on which the toner image has been transferred at the transfer section
Is separated from the surface of the photosensitive drum 61 and conveyed to the fixing device 66 to be subjected to a toner image fixing process, and is output as an image formed product (print, copy).
【0075】用紙Pに対するトナー像転写後の感光ドラ
ム61面はクリーニング器67で転写残りトナー等を除
去されて清浄面化され、繰り返して作像に供される。
The surface of the photosensitive drum 61 after the transfer of the toner image onto the paper P is cleaned by a cleaning device 67 to remove the transfer residual toner and the like, and is repeatedly used for image formation.
【0076】62a・64a・65aはそれぞれ帯電ロ
ーラ62・現像器64・転写ローラ65に対するバイア
ス電源である。
Reference numerals 62a, 64a and 65a are bias power sources for the charging roller 62, the developing device 64 and the transfer roller 65, respectively.
【0077】給紙部100は前述図1・図2の1枚分離
給紙機構を用いており、再度の説明は省略する。68・
69はそれぞれ1枚分離給紙された用紙Pの中継ぎ搬送
ローラと、1枚分離給紙された用紙Pを転写部へ所定の
タイミングで給送するレジストローラである。
The sheet feeding section 100 uses the one-sheet separating / feeding mechanism shown in FIGS. 1 and 2, and the description thereof will be omitted. 68
Reference numeral 69 denotes an intermediate transfer roller for the sheet P for which one sheet has been separated and fed, and a registration roller for feeding the sheet P for which one sheet has been separated and fed at a predetermined timing.
【0078】本実施例のプリンタは、感光ドラム61、
帯電ローラ62、現像器64、クリーニング器67の4
つのプロセス機器を一括してプリンタ本体に対して着脱
交換自在なプロセスカートリッジPCとしてある。
The printer of the present embodiment has the photosensitive drum 61,
4 of the charging roller 62, the developing device 64, and the cleaning device 67
This is a process cartridge PC in which two process devices are collectively attached to and detachable from the printer body.
【0079】図18は前述図1・図2の機構を積載原稿
の1枚分離給紙機構として用いた原稿給送装置例の概略
構成を示したものである。
FIG. 18 shows a schematic structure of an example of an original feeding apparatus using the mechanism shown in FIGS. 1 and 2 as a single-sheet separating / feeding mechanism for stacked originals.
【0080】200は原稿給送装置、300はこの原稿
給送装置200を搭載させた、例えば原稿読取り装置
(原稿スキャナー)である。複写機や画像投影装置等で
あってもよい。
Reference numeral 200 denotes a document feeder, and reference numeral 300 denotes, for example, a document reader (document scanner) having the document feeder 200 mounted thereon. It may be a copying machine or an image projection device.
【0081】原稿読取り装置300において、301は
装置の上面に配設した原稿載置ガラス(プラテンガラ
ス)、302はこの原稿載置ガラス301の下面側にお
いてガラス下面に沿って左方のホームポジションから右
方へ所定の速度で往動駆動され、再び左方のホームポジ
ションへ復動駆動されて戻される原稿画像光電読取りユ
ニットである。
In the original reading apparatus 300, 301 is an original placing glass (platen glass) disposed on the upper surface of the apparatus, and 302 is a lower surface side of the original placing glass 301 from the left home position along the lower surface of the glass. The original image photoelectric reading unit is driven forward to the right at a predetermined speed, and is driven backward to the home position to the left again and returned.
【0082】原稿給送装置200は原稿読取り装置30
0の上記原稿載置ガラス301の上側に配設されてい
る。
The document feeding device 200 is the document reading device 30.
No. 0 is placed above the original placing glass 301.
【0083】100は原稿給送装置200に配設した積
載原稿1枚分離給紙機構であり、前述図1・図2の機構
を用いており、再度の説明は省略する。用紙載置台3は
固定としてあり、この上に原稿Oが画像面上向きで積載
セットされる。
Reference numeral 100 denotes a single-stacked original document separating / feeding mechanism arranged in the original document feeder 200, which uses the mechanism shown in FIGS. 1 and 2 and will not be described again. The paper table 3 is fixed, and the original O is stacked and set on the paper table 3 with the image surface facing upward.
【0084】原稿給送スタート信号に基づいて積載原稿
Oの最上位原稿が1枚分離給紙され、原稿中継ぎ搬送ロ
ーラ72・72を含む反転シートパス71を通り、画像
面が下向きにされて、原稿搬送回動ベルト73により原
稿載置ガラス301の上面を左方から右方へ搬送されて
いき、原稿載置ガラス301上の所定の載置位置まで搬
送されるとベルト73の回動が一時停止される。これに
より原稿が原稿載置ガラス301の上面の所定の位置に
画像面下向きで搬送セットされた状態になる。次いで原
稿読取り装置300側の読取りユニット302が往動駆
動されて、原稿載置ガラス301上の上記セット原稿の
下向き画像面が光電読取り処理される。光電読取りが終
了すると、読取りユニット302は復動し、またベルト
73が再び回動して、原稿載置ガラス301上の読取り
済み原稿が右方へ搬送されて原稿載置ガラス301上か
らシートパス74・排紙ローラ75を通って原稿排紙ト
レイ部76へ排出される。
Based on the original feeding start signal, one of the uppermost originals of the stacked originals O is separated and fed, passes through the reverse sheet path 71 including the original intermediate transfer rollers 72, and the image surface is turned downward. The original conveying rotation belt 73 conveys the upper surface of the original placing glass 301 from left to right, and when the original conveying glass 301 is conveyed to a predetermined placing position, the belt 73 temporarily rotates. Be stopped. As a result, the original is conveyed and set at a predetermined position on the upper surface of the original placing glass 301 with the image surface facing downward. Next, the reading unit 302 on the original reading device 300 side is driven to move forward, and the downward image surface of the set original on the original placing glass 301 is photoelectrically read. When the photoelectric reading is completed, the reading unit 302 is moved back, and the belt 73 is rotated again to convey the read document on the document placing glass 301 to the right, and to pass the sheet path from the document placing glass 301. The sheet 74 is discharged to the document discharge tray section 76 through the sheet discharge roller 75.
【0085】[0085]
【発明の効果】以上のように本発明によれば、用紙(原
稿)相互の静電気・密着性・摩擦抵抗・すべり性等のフ
ァクターの1枚分離給紙性能への影響を少なくして、重
送現象を生じさせずに用紙を確実に1枚分離給紙させる
ことが可能な信頼性の高い1枚分離給紙機構、これを用
いた信頼性の高い画像形成装置や原稿給送装置を得るこ
とができる。
As described above, according to the present invention, factors such as static electricity, adhesiveness, frictional resistance, and slippage between paper sheets (original sheets) are less likely to affect the single-sheet separating / feeding performance, and the weight of the sheets can be reduced. (EN) A highly reliable single-sheet separating / feeding mechanism capable of reliably separating and feeding one sheet of paper without causing a feeding phenomenon, and a highly reliable image forming apparatus and original document feeding apparatus using the same. be able to.
【図面の簡単な説明】[Brief description of drawings]
【図1】 一実施例の1枚分離給紙機構の要部の側面図FIG. 1 is a side view of a main part of a one-sheet separating and feeding mechanism according to an embodiment.
【図2】 一部切り欠き平面図[Figure 2] Partially cutaway plan view
【図3】 給紙スタート信号に基づいて給紙モータの駆
動が開始され、また用紙押え手段としてのゴム板が積載
用紙の上面に接触した状態時の図
FIG. 3 is a diagram showing a state in which the drive of a paper feed motor is started based on a paper feed start signal and a rubber plate as a paper pressing means is in contact with the upper surface of stacked paper.
【図4】 下側給紙ローラが下降して積載用紙の上面に
接触した状態時の図
FIG. 4 is a diagram showing a state in which the lower paper feed roller is lowered and is in contact with the upper surface of stacked sheets.
【図5】 接触した下側給紙ローラによる逆搬送力で最
上位用紙に、下側給紙ローラとゴム板との間でループが
形成された状態時の図
FIG. 5 is a diagram showing a state in which a loop is formed between the lower sheet feeding roller and the rubber plate on the uppermost sheet by the reverse conveyance force of the lower sheet feeding roller which is in contact with the uppermost sheet.
【図6】 最上位用紙の先端部が下側給紙ローラの上側
に移行して該最上位用紙が一枚分離状態になった状態時
の図
FIG. 6 is a diagram showing a state in which the leading end of the uppermost sheet moves to the upper side of the lower sheet feeding roller and the uppermost sheet is in a single-sheet separation state
【図7】 下側給紙ローラが引き上げられて最上位用紙
の先端部が該下側給紙ローラと上側給紙ローラとの圧接
ニップ部に挟持された状態時の図
FIG. 7 is a diagram showing a state in which the lower paper feed roller is pulled up and the leading end of the uppermost paper is nipped in the pressure contact nip portion between the lower paper feed roller and the upper paper feed roller.
【図8】 次いでゴム板による積載用紙の押えが解除さ
れて、上側と下側の給紙ローラにより最上位用紙が挟持
搬送されている状態時の図
FIG. 8 is a diagram showing a state in which the pressing of the stacked sheets by the rubber plate is released, and the uppermost sheet is nipped and conveyed by the upper and lower sheet feeding rollers.
【図9】 最上位用紙の搬送が進行した状態時の図FIG. 9 is a diagram showing a state in which conveyance of the topmost sheet has progressed
【図10】 機構の1枚分離給紙動作のタイミングチャ
ート
FIG. 10 is a timing chart of the single-sheet separating / feeding operation of the mechanism.
【図11】 連続給紙時の動作タイミングチャート例FIG. 11 is an example of an operation timing chart during continuous paper feeding.
【図12】 用紙押え手段をローラ体にした機構の側面
FIG. 12 is a side view of a mechanism in which a sheet pressing unit is a roller body.
【図13】 用紙押え手段としてのゴム板自体をソレノ
イドで積載用紙の上面に対して接離させるように構成し
た機構の側面図
FIG. 13 is a side view of a mechanism in which a rubber plate itself as a paper pressing means is brought into contact with and separated from an upper surface of stacked paper by a solenoid.
【図14】 用紙押え手段としてのローラ体自体をソレ
ノイドで積載用紙の上面に対して接離させるように構成
した機構の側面図
FIG. 14 is a side view of a mechanism in which a roller body serving as a sheet pressing unit is configured to be brought into contact with and separated from an upper surface of stacked sheets by a solenoid.
【図15】 用紙押え手段をモータで回転駆動される回
転ローラ体にした機構の側面図
FIG. 15 is a side view of a mechanism in which the sheet pressing means is a rotating roller body that is rotationally driven by a motor.
【図16】 給紙カセットを装着使用した機構の、最上
位用紙にループが形成された状態時の図
FIG. 16 is a diagram of a mechanism in which a paper feed cassette is mounted and used when a loop is formed on the topmost paper.
【図17】 図1・図2の機構を給紙部の積載用紙の1
枚分離給紙機構として用いた画像形成装置例の概略構成
FIG. 17 shows the mechanism of FIGS.
Schematic configuration diagram of an example of an image forming apparatus used as a sheet separating and feeding mechanism
【図18】 図1図2の機構を積載原稿の1枚分離給紙
機構として用いた原稿給送装置例の概略構成図
FIG. 18 is a schematic configuration diagram of an example of an original feeding apparatus using the mechanism of FIGS. 1 and 2 as a single-sheet separating / feeding mechanism for stacked originals.
【符号の説明】[Explanation of symbols]
P 積載用紙 M 給紙モータ 3 用紙載置台 26 上側給紙ローラ(第1の給紙用回転体) 26 下側給紙ローラ(第2の給紙用回転体) 32 用紙押え手段としてのゴム板 42 用紙検知手段 P stacked paper M paper feed motor 3 paper loading table 26 upper paper feed roller (first paper feed rotator) 26 lower paper feed roller (second paper feed rotator) 32 rubber plate as paper pressing means 42 paper detection means
フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 G03G 15/00 514 2107−2H Continuation of front page (51) Int.Cl. 6 Identification number Office reference number FI technical display location G03G 15/00 514 2107-2H

Claims (5)

    【特許請求の範囲】[Claims]
  1. 【請求項1】第1の給紙用回転体と、 第2の給紙用回転体と、 該第2の給紙用回転体を前記第1の給紙用回転体と積載
    用紙との間に揺動させて、第1の給紙用回転体に接触さ
    せた第1切換え状態と、積載用紙面に接触させた第2切
    換え状態に転換させる移動手段と、 前記第1切換え状態において第1と第2の給紙用回転体
    との圧接ニップ部で用紙を給紙方向に挟持搬送する方向
    に少なくとも第2の給紙用回転体を回転させる駆動手段
    と、 前記第2切換え状態において積載用紙に接触した第2の
    給紙用回転体の位置よりも給紙方向上流側において積載
    用紙に作用して積載用紙の給紙方向とは反対方向への動
    きを規制する用紙押え手段と、 前記第2切換え状態において積載用紙に接触した前記第
    2の給紙用回転体の回転により該第2の給紙用回転体が
    直接接している用紙が給紙方向とは逆方向に搬送される
    ことで該第2の給紙用回転体と前記用紙押え手段との間
    に用紙のループが形成されながら該用紙の先端部が該第
    2の給紙用回転体の位置を抜けて該第2の給紙用回転体
    の積載用紙側とは反対側へ移行したことを検知する用紙
    検知手段と、 給紙信号により前記駆動手段をオンさせ、また前記移動
    手段により前記第2の給紙用回転体を第2切換え状態に
    転換させ、前記用紙検知手段の用紙検知信号により前記
    第2の給紙回転体を第1切換え状態に転換させる制御手
    段を有することを特徴とする1枚分離給紙機構。
    1. A first paper feed rotator, a second paper feed rotator, and a second paper feed rotator between the first paper feed rotator and stacked sheets. And a moving means for swinging the first sheet-feeding rotary member into contact with the first switching state and a second switching state in which the first sheet-rotating member comes into contact with the stacked sheet surface, and a first switching state in the first switching state. Drive means for rotating at least the second paper feed rotary member in a direction in which the paper is pinched and conveyed in the paper feed direction at the pressure contact nip portion between the second paper feed rotary member and the second paper feed rotary member; A sheet pressing unit that acts on the stacked sheets on the upstream side in the sheet feeding direction with respect to the position of the second sheet feeding rotary member that is in contact with the sheet feeding unit, and restricts movement of the stacked sheets in a direction opposite to the sheet feeding direction; In the 2-switching state, the rotation of the second paper feed rotary member that comes into contact with the stacked paper feeds the second paper feed. The sheet directly contacted by the rolling element is conveyed in a direction opposite to the sheet feeding direction, whereby a loop of the sheet is formed between the second sheet feeding rotator and the sheet pressing means. Paper detection means for detecting that the front end has passed through the position of the second paper feed rotary member and has moved to the side opposite to the stacked paper side of the second paper feed rotary member, and a paper feed signal The driving means is turned on, the moving means changes the second sheet feeding rotary body to the second switching state, and the second sheet feeding rotary body is set to the first state by the sheet detection signal of the sheet detecting means. A single-sheet separating / feeding mechanism having control means for switching to a switching state.
  2. 【請求項2】 前記用紙押え手段が、移動手段により積
    載用紙から非接触に退避した第1切換え状態と、積載用
    紙に接触して用紙を押えた第2切換え状態とに転換され
    る部材であり、前記第2の給紙用回転体が第2切換え状
    態に転換される前に或いは同時的に第2状態に転換さ
    れ、前記第2の給紙用回転体が第1切換え状態に転換さ
    れたとき同時的に第1切換え状態に転換されることを特
    徴とする請求項1に記載の1枚分離給紙機構。
    2. The sheet pressing means is a member that is switched between a first switching state in which the moving means retracts from the stacked sheets in a non-contact manner and a second switching state in which the stacked sheets are brought into contact with and presses the sheets. , The second sheet feeding rotary body is switched to the second state before or at the same time as the second sheet feeding rotary body is switched to the second switching state, and the second sheet feeding rotary body is switched to the first switching state. The single-sheet separating / feeding mechanism according to claim 1, wherein the sheets are simultaneously switched to the first switching state.
  3. 【請求項3】 前記第2給紙用回転体の第1切換え状態
    において第1と第2の給紙用回転体が共に圧接ニップ部
    で用紙を給紙方向に挟持搬送する方向に回転駆動される
    ことを特徴とする請求項1に記載の1枚分離給紙機構。
    3. In the first switching state of the second sheet feeding rotary member, both the first and second sheet feeding rotary members are rotationally driven in a direction in which the sheet is sandwiched and conveyed in the sheet feeding direction at the pressure contact nip portion. The single-sheet separating / feeding mechanism according to claim 1, wherein
  4. 【請求項4】 給紙部にセットした積載用紙を1枚分離
    給紙機構で作像部へ1枚分離給紙して画像形成を実行さ
    せる画像形成装置であり、前記の1枚分離給紙機構は、 第1の給紙用回転体と、 第2の給紙用回転体と、 該第2の給紙用回転体を前記第1の給紙用回転体と積載
    用紙との間に揺動させて、第1の給紙用回転体に接触さ
    せた第1切換え状態と、積載用紙面に接触させた第2切
    換え状態に転換させる移動手段と、 前記第1切換え状態において第1と第2の給紙用回転体
    との圧接ニップ部で用紙を給紙方向に挟持搬送する方向
    に少なくとも第2の給紙用回転体を回転させる駆動手段
    と、 前記第2切換え状態において積載用紙に接触した第2の
    給紙用回転体の位置よりも給紙方向上流側において積載
    用紙に作用して積載用紙の給紙方向とは反対方向への動
    きを規制する用紙押え手段と、 前記第2切換え状態において積載用紙に接触した前記第
    2の給紙用回転体の回転により該第2の給紙用回転体が
    直接接している用紙が給紙方向とは逆方向に搬送される
    ことで該第2の給紙用回転体と前記用紙押え手段との間
    に用紙のループが形成されながら該用紙の先端部が該第
    2の給紙用回転体の位置を抜けて該第2の給紙用回転体
    の積載用紙側とは反対側へ移行したことを検知する用紙
    検知手段と、 給紙信号により前記駆動手段をオンさせ、また前記移動
    手段により前記第2の給紙用回転体を第2切換え状態に
    転換させ、前記用紙検知手段の用紙検知信号により前記
    第2の給紙回転体を第1切換え状態に転換させる制御手
    段を有してなることを特徴とする画像形成装置。
    4. An image forming apparatus that separates and feeds a stack of sheets set in a sheet feeding section to an image forming section by a single sheet separating and feeding mechanism to execute image formation. The mechanism includes a first sheet feeding rotary member, a second sheet feeding rotary member, and a second sheet feeding rotary member swinging between the first sheet feeding rotary member and the stacked sheets. Moving means for moving the first sheet-feeding rotator into a first switching state and a second sheet-switching state in contact with the stacked sheet surface; and first and second switching states in the first switching state. Drive means for rotating at least the second paper feed rotator in a direction in which the paper is nipped and conveyed in the paper feed direction at the pressure contact nip portion with the second paper feed rotator; and contacting the stacked paper sheets in the second switching state. When the stacked sheets are fed in the sheet feeding direction on the upstream side in the sheet feeding direction with respect to the position of the second sheet feeding rotary member, The sheet pressing means for restricting the movement in the opposite direction and the second sheet feeding rotary body are in direct contact with each other by the rotation of the second sheet feeding rotary body that comes into contact with the stacked sheets in the second switching state. By conveying the sheet in the direction opposite to the sheet feeding direction, a loop of the sheet is formed between the second sheet feeding rotary member and the sheet pressing means, and the leading end of the sheet is moved to the second sheet feeding direction. A sheet detecting means for detecting that the sheet has passed through the position of the sheet feeding rotator and has moved to the side opposite to the stacked sheet side of the second sheet feeding rotator, and the driving means is turned on by a sheet feeding signal, Further, the moving means converts the second sheet feeding rotary member into the second switching state, and the sheet detecting signal of the sheet detecting unit converts the second sheet feeding rotating member into the first switching state. An image forming apparatus comprising:
  5. 【請求項5】 原稿載置部にセットした積載原稿を1枚
    分離給紙機構で原稿露光部あるいは読取り部へ1枚分離
    給紙する原稿給送装置であり、前記の1枚分離給紙機構
    は、 第1の給紙用回転体と、 第2の給紙用回転体と、 該第2の給紙用回転体を前記第1の給紙用回転体と積載
    原稿との間に揺動させて、第1の給紙用回転体に接触さ
    せた第1切換え状態と、積載原稿面に接触させた第2切
    換え状態に転換させる移動手段と、 前記第1切換え状態において第1と第2の給紙用回転体
    との圧接ニップ部で用紙を給紙方向に挟持搬送する方向
    に少なくとも第2の給紙用回転体を回転させる駆動手段
    と、 前記第2切換え状態において積載原稿に接触した第2の
    給紙用回転体の位置よりも給紙方向上流側において積載
    原稿に作用して積載原稿の給紙方向とは反対方向への動
    きを規制する原稿押え手段と、 前記第2切換え状態において積載原稿に接触した前記第
    2の給紙用回転体の回転により該第2の給紙用回転体が
    直接接している原稿が給紙方向とは逆方向に搬送される
    ことで該第2の給紙用回転体と前記原稿押え手段との間
    に用紙のループが形成されながら該原稿の先端部が該第
    2の給紙用回転体の位置を抜けて該第2の給紙用回転体
    の積載原稿側とは反対側へ移行したことを検知する原稿
    検知手段と、 原稿給紙信号により前記駆動手段をオンさせ、また前記
    移動手段により前記第2の給紙用回転体を第2切換え状
    態に転換させ、前記原稿検知手段の原稿検知信号により
    前記第2の給紙回転体を第1切換え状態に転換させる制
    御手段を有してなることを特徴とする原稿給送装置。
    5. A document feeding device for feeding one sheet of a stacked document set on a document placing section to a document exposing section or a reading section by a one-sheet separating / feeding mechanism. Includes a first paper feed rotary member, a second paper feed rotary member, and a second paper feed rotary member swingable between the first paper feed rotary member and a stacked document. A first switching state in which the first sheet-feeding rotary member is brought into contact with the first switching state, and a second switching state in which the document sheet surface is brought into contact with the second switching state; and first and second switching states in the first switching state. Drive means for rotating at least the second sheet feeding rotary member in the direction of sandwiching and conveying the sheet in the sheet feed direction at the pressure contact nip portion with the sheet feeding rotary member, and contacting the stacked document in the second switching state. A method of feeding a stacked document by acting on the stacked document on the upstream side in the sheet feeding direction with respect to the position of the second sheet feeding rotary member. The document pressing means for restricting the movement in the opposite direction to the second sheet feeding rotator comes into direct contact with the second sheet feeding rotator which is brought into contact with the stacked document in the second switching state. The document being conveyed is conveyed in the direction opposite to the paper feeding direction, so that a loop of the paper is formed between the second paper feeding rotary member and the document pressing means, and the leading end portion of the document is moved to the first direction. A document detecting unit that detects that the second sheet feeding rotator has passed through the position and the second sheet feeding rotator has moved to the side opposite to the loaded document side; The second feeding rotary member is turned on, the second feeding rotary member is changed to the second switching state by the moving unit, and the second feeding rotary member is changed to the first switching state by the original detection signal of the original detecting unit. A document feeding device comprising a control means for controlling the document feeding device.
JP5243840A 1993-09-03 1993-09-03 One-sheet paper feeding mechanism, image former and document feeder Withdrawn JPH0769468A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5243840A JPH0769468A (en) 1993-09-03 1993-09-03 One-sheet paper feeding mechanism, image former and document feeder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5243840A JPH0769468A (en) 1993-09-03 1993-09-03 One-sheet paper feeding mechanism, image former and document feeder

Publications (1)

Publication Number Publication Date
JPH0769468A true JPH0769468A (en) 1995-03-14

Family

ID=17109732

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5243840A Withdrawn JPH0769468A (en) 1993-09-03 1993-09-03 One-sheet paper feeding mechanism, image former and document feeder

Country Status (1)

Country Link
JP (1) JPH0769468A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008074511A (en) * 2006-09-19 2008-04-03 Seiko Epson Corp Paper bundle printer and control method for paper bundle printer
JP2009280329A (en) * 2008-05-21 2009-12-03 Funai Electric Co Ltd Image forming device
WO2012017624A1 (en) 2010-08-06 2012-02-09 Canon Kabushiki Kaisha Sheet feeding device, image forming apparatus, and image scanning apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008074511A (en) * 2006-09-19 2008-04-03 Seiko Epson Corp Paper bundle printer and control method for paper bundle printer
JP2009280329A (en) * 2008-05-21 2009-12-03 Funai Electric Co Ltd Image forming device
WO2012017624A1 (en) 2010-08-06 2012-02-09 Canon Kabushiki Kaisha Sheet feeding device, image forming apparatus, and image scanning apparatus
US8891143B2 (en) 2010-08-06 2014-11-18 Canon Kabushiki Kaisha Sheet feeding device, image forming apparatus, and image scanning apparatus

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