JPH10142844A - Both-side image forming device - Google Patents
Both-side image forming deviceInfo
- Publication number
- JPH10142844A JPH10142844A JP8293657A JP29365796A JPH10142844A JP H10142844 A JPH10142844 A JP H10142844A JP 8293657 A JP8293657 A JP 8293657A JP 29365796 A JP29365796 A JP 29365796A JP H10142844 A JPH10142844 A JP H10142844A
- Authority
- JP
- Japan
- Prior art keywords
- recording paper
- image forming
- recording
- unit
- sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Handling Of Cut Paper (AREA)
- Counters In Electrophotography And Two-Sided Copying (AREA)
- Paper Feeding For Electrophotography (AREA)
- Conveyance By Endless Belt Conveyors (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、シート状記録紙
を搬送し、記録紙の両面に画像を形成する両面画像形成
装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided image forming apparatus for conveying a sheet of recording paper and forming images on both sides of the recording paper.
【０００２】[0002]
【従来の技術】従来、この種の両面画像形成装置におい
ては、給紙カセット等の記録紙収納容器内から給紙部に
より給送された記録紙を画像形成部に導き、片面画像形
成後に、例えばスイッチバック方式等による記録紙反転
を行って、片面に画像形成済みの記録紙を上方の記録紙
導入部から両面画像形成用収納容器（中間スタッカ）内
に送り込み、該記録紙を再給紙部により画像形成部に送
り出して記録紙の両面に画像を形成する2. Description of the Related Art Conventionally, in a double-sided image forming apparatus of this type, a recording sheet fed from a recording sheet storage container such as a sheet cassette by a sheet feeding section is guided to an image forming section, and after a single-sided image is formed, For example, the recording paper is inverted by a switchback method or the like, and the recording paper on which an image has been formed on one side is fed into the double-sided image forming storage container (intermediate stacker) from the upper recording paper introduction portion, and the recording paper is fed again. To form an image on both sides of the recording paper by sending it to the image forming unit
【０００３】[0003]
【発明が解決しようとする課題】上記の両面画像形成装
置においては、以下の問題点がある。The above two-sided image forming apparatus has the following problems.
【０００４】（１）前記記録紙導入部から両面画像形成
用収納容器内に送り込まれた記録紙の先端部が、該収納
容器の底面または該収納容器内に積載された先行の記録
紙の上面に当接して、滑走して突き当て面に移送すると
き、該記録紙の先端部が該収納容器の底面または前記先
行した記録紙の上面に突き当たって湾曲し、搬送不良を
発生することがある。特に、下側にカールした記録紙
が、前記記録紙導入部から収納容器内に搬入されるとき
には、搬送不良が頻発する。(1) The leading end of the recording paper fed from the recording paper introduction section into the double-sided image forming storage container is placed on the bottom surface of the storage container or the upper surface of the preceding recording paper stacked in the storage container. When the paper is slid and transported to the abutting surface, the leading end of the recording paper abuts against the bottom surface of the storage container or the upper surface of the preceding recording paper, and may be curved, thereby causing a conveyance failure. . In particular, when the recording paper curled downward is conveyed into the storage container from the recording paper introduction unit, conveyance failure frequently occurs.
【０００５】（２）記録紙が前記記録紙導入部から両面
画像形成用収納容器内に高速で送り込まれるときには、
記録紙の先端部が該収納容器の底面または前記先行した
記録紙の上面に高速で突き当たって湾曲し、搬送不良を
発生する。(2) When the recording paper is fed at a high speed from the recording paper introduction section into the double-sided image forming storage container,
The leading end of the recording paper abuts on the bottom surface of the storage container or the top surface of the preceding recording paper at a high speed and is curved, thereby causing a conveyance failure.
【０００６】[0006]
【課題を解決するための手段】本発明は、上記のような
諸問題点を解決し、記録紙導入部から両面画像形成用収
納容器内に送り込まれた記録紙の先端部が、該収納容器
の底面または該収納容器内に積載された先行の記録紙の
上面に当接したのち、滑走して突き当て面に確実に移送
する安定した記録紙搬送を実現する両面画像形成装置を
提供することを目的とする。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and the leading end of the recording paper fed from the recording paper introduction section into the double-sided image forming storage container is moved to the storage container. The present invention provides a double-sided image forming apparatus which realizes stable recording paper conveyance in which the recording paper is reliably transported to a bottom surface or a top surface of a preceding recording paper stacked in the storage container, and then slid and transferred to the abutting surface. With the goal.
【０００７】上記目的を達成する本発明の請求項１に記
載の両面画像形成装置は、片面に画像形成済みの記録紙
を記録紙導入部から収納容器内に送り込み、該記録紙を
再給紙部により画像形成部に送り出して記録紙の両面に
画像を形成する両面画像形成装置において、前記記録紙
導入部が記録紙サイズに対応して前記収納容器の記録紙
載置面と平行する方向に移動可能なユニットに構成さ
れ、かつ、該ユニットが記録紙搬送手段と、導入される
記録紙の上方経路を規制する傾斜案内面を有する上案内
部材と、導入される記録紙の下方経路を規制する傾斜案
内面を有する下案内部材とから成ることを特徴とするも
のである。According to a first aspect of the present invention, there is provided a double-sided image forming apparatus in which recording paper having an image formed on one side is fed into a storage container from a recording paper introduction section, and the recording paper is fed again. In a double-sided image forming apparatus for forming an image on both sides of a recording sheet by sending the recording sheet to an image forming unit by a unit, the recording sheet introduction unit is arranged in a direction parallel to a recording sheet placement surface of the storage container corresponding to a recording sheet size. A movable unit, wherein the unit has a recording paper conveying means, an upper guide member having an inclined guide surface for restricting an upper path of the recording paper to be introduced, and a lower path of the recording paper to be introduced; And a lower guide member having an inclined guide surface.
【０００８】また、上記目的を達成する本発明の請求項
２に記載の両面画像形成装置は、片面に画像形成済みの
記録紙を、複数の記録紙サイズにそれぞれ対応して固定
配置された複数の記録紙導入部から収納容器内に送り込
み、該記録紙を再給紙部により画像形成部に送り出して
記録紙の両面に画像を形成する両面画像形成装置におい
て、前記複数の記録紙導入部が、導入される記録紙の上
方経路を規制する傾斜案内面を有する上案内部材と、導
入される記録紙の下方経路を規制する傾斜案内面を有す
る下案内部材とから成ることを特徴とするものである。According to a second aspect of the present invention, there is provided a double-sided image forming apparatus, comprising: a plurality of recording paper sheets on which an image has been formed on one side; In the double-sided image forming apparatus which feeds the recording paper from the recording paper introduction unit into the storage container and sends the recording paper to the image forming unit by the re-feeding unit to form images on both sides of the recording paper, the plurality of recording paper introduction units are An upper guide member having an inclined guide surface that regulates an upper path of the recording paper to be introduced, and a lower guide member having an inclined guide surface that regulates a lower path of the introduced recording paper. It is.
【０００９】また、上記目的を達成する本発明の請求項
３に記載の両面画像形成装置は、片面に画像形成済みの
記録紙を記録紙導入部から収納容器内に送り込み、該記
録紙を再給紙部により画像形成部に送り出して記録紙の
両面に画像を形成する両面画像形成装置において、前記
収納容器に導入する記録紙の先端部が前記記録紙導入部
を通過する時に、該記録紙導入部通過後の記録紙搬送速
度を、前記記録紙導入部通過前の記録紙搬送速度より低
速に切り換え設定する制御手段を備えてなることを特徴
とするものである。According to a third aspect of the present invention, there is provided a double-sided image forming apparatus, wherein a recording sheet having an image formed on one side is fed into a storage container from a recording sheet introduction section, and the recording sheet is re-used. In a double-sided image forming apparatus for forming an image on both sides of a recording sheet by feeding the recording sheet to a sheet forming section, when the leading end of the recording sheet introduced into the storage container passes through the recording sheet introduction section, the recording sheet is It is characterized by comprising control means for switching and setting the recording paper conveyance speed after passing through the introduction section to be lower than the recording paper conveyance speed before passing through the recording paper introduction section.
【００１０】[0010]
【発明の実施の形態】以下、この発明の給紙装置を備え
た画像形成装置の実施の形態を説明する。図１は画像形
成装置の概略構成図、図２は画像形成装置の用紙搬送経
路を示す模式図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an image forming apparatus provided with a paper feeder according to the present invention will be described below. FIG. 1 is a schematic configuration diagram of the image forming apparatus, and FIG. 2 is a schematic diagram illustrating a sheet conveyance path of the image forming apparatus.
【００１１】この実施の形態では画像形成装置として複
写装置を示している。この複写装置には画像形成部１０
と、給紙部２０と、排紙部３０と、反転搬送部４０と、
記録紙導入部５０と、中間スタッカ部６０と、再給紙部
７０とが備えられ、画像形成部１０の転写部へ記録紙Ｐ
を搬送する給紙経路Ａと、前記転写部から記録済みの記
録紙Ｐを排出または再給紙する搬送経路Ｂと、画像が形
成された記録紙Ｐを装置外に排出する排出経路Ｃと、画
像形成部１０で画像が形成された記録紙Ｐを反転後再度
画像形成部１０に循環させるための循環反転給紙経路Ｄ
とを有している。In this embodiment, a copying apparatus is shown as an image forming apparatus. This copying apparatus includes an image forming unit 10.
, A paper feed unit 20, a paper discharge unit 30, a reverse transport unit 40,
A recording paper introduction unit 50, an intermediate stacker unit 60, and a re-feed unit 70 are provided, and the recording paper P is transferred to a transfer unit of the image forming unit 10.
A conveyance path B for discharging or re-feeding the recording paper P recorded from the transfer unit, a discharge path C for discharging the recording paper P on which an image is formed outside the apparatus, A reversing paper feed path D for reversing the recording paper P on which an image is formed by the image forming unit 10 and recirculating the recording paper P to the image forming unit 10
And
【００１２】画像形成部１０には、像担持体（感光体ド
ラム）１１が配置され、像担持体１１には帯電器１２に
より一様の帯電が付与され、露光手段１３により画像情
報を像担持体１１の周面に照射し、静電潜像を形成す
る。静電潜像は現像器１４により現像され、トナー像を
形成する。An image carrier (photosensitive drum) 11 is disposed in the image forming section 10, and the image carrier 11 is uniformly charged by a charger 12, and image information is carried by an exposure unit 13. Irradiate the peripheral surface of the body 11 to form an electrostatic latent image. The electrostatic latent image is developed by the developing device 14 to form a toner image.
【００１３】給紙部２０には、少なくとも１つの給紙ユ
ニットが設けられている。該給紙ユニットには、多数枚
の記録紙Ｐを収納する給紙トレイ２１が引き出し可能に
配置されている。２２は給紙ローラ２３に記録紙Ｐを圧
接させる可動底板である。該給紙ローラ２３を駆動回転
することにより可動底板２２上の最上層の記録紙Ｐは間
欠的に取り出される。該給紙ローラ２３の給紙下流側に
は重送防止用ローラ対２４，２５が配置され、記録紙Ｐ
を１枚づつ次工程に送り出し、それぞれ給紙経路Ａに配
置された中間給紙ローラ２６，２７を介して第２給紙ロ
ーラ（レジストローラ）２８に給送される。The paper supply section 20 is provided with at least one paper supply unit. In the paper supply unit, a paper supply tray 21 for storing a large number of recording papers P is arranged so as to be able to be pulled out. Reference numeral 22 denotes a movable bottom plate that presses the recording paper P against the paper feed roller 23. By driving and rotating the paper feed roller 23, the uppermost recording paper P on the movable bottom plate 22 is intermittently taken out. A double feed prevention roller pair 24, 25 is disposed downstream of the paper feed roller 23 in the paper feed direction.
Are fed one by one to the next step, and are fed to a second sheet feeding roller (registration roller) 28 via intermediate sheet feeding rollers 26 and 27 arranged in the sheet feeding path A, respectively.
【００１４】像担持体１１の回転に同期して第２給紙ロ
ーラ２８を駆動し、記録紙Ｐを転写器１５に送り込みト
ナー像を転写する。その後、分離器１６により像担持体
１１から記録紙Ｐを分離し、搬送ベルト１７により定着
装置１８に搬送する。また、像担持体１１の周囲には、
クリーニング装置１９が配設され、転写後の像担持体１
１の表面の残留トナーを除去する。さらに、次の像形成
のために、帯電器１２で再度帯電する。The second paper feed roller 28 is driven in synchronization with the rotation of the image carrier 11, and the recording paper P is sent to the transfer unit 15 to transfer the toner image. After that, the recording paper P is separated from the image carrier 11 by the separator 16, and is conveyed to the fixing device 18 by the conveyance belt 17. Further, around the image carrier 11,
A cleaning device 19 is provided, and the image carrier 1 after transfer is provided.
1 to remove residual toner on the surface. Further, for the next image formation, the charger 12 charges again.
【００１５】記録紙Ｐ上のトナー像は、定着装置１８で
加熱、加圧され定着される。定着された記録紙Ｐは、排
紙部３０に送り出される。すなわち、記録紙Ｐは定着装
置１８の搬送下流側に配置された排紙案内ローラ３１の
ニップ位置を通過し、さらに搬送下流側の排紙切換部材
（切換ゲート）３２によって記録紙Ｐの搬送経路が排出
側と、反転再給紙側に切り換えられる。排出側に切り換
えられた記録紙Ｐは、切換ゲート３２の上方の通路を通
過し、排紙ローラ３３により排紙トレイ３４上に載置さ
れる。The toner image on the recording paper P is heated and pressed by a fixing device 18 to be fixed. The fixed recording paper P is sent to the paper discharge unit 30. That is, the recording paper P passes through the nip position of the paper discharge guide roller 31 disposed on the downstream side of the conveyance of the fixing device 18, and is further conveyed by the paper discharge switching member (switching gate) 32 on the downstream side of the conveyance. Is switched between the discharge side and the reversing and re-feeding side. The recording sheet P switched to the discharge side passes through a path above the switching gate 32 and is placed on a discharge tray 34 by a discharge roller 33.
【００１６】記録紙反転再給紙側には、反転搬送部４０
と、記録紙導入部５０と、中間スタッカ部６０と、再給
紙部７０とを備えている。切換ゲート３２が反転再給紙
側に切り換えられると、切換ゲート３２の下方の通路ａ
を通過した記録紙Ｐが、反転搬送部４０の搬送ローラ４
１を介して下方に搬送され、分岐部材４２の図示左方の
通路ｂを通過し、更に搬送下流側の垂直通路ｃを経て、
正逆回転可能な搬送ローラ４３に挟持されて搬送され、
その後、湾曲通路ｄで水平方向に進路が曲げられ、画像
形成装置本体の底板１００の上面と前記給紙トレイ２１
の底面との間に形成された空間に設けられた水平通路ｅ
に進入して所定位置で一時停止する。この停止時の用紙
先端位置は、用紙のサイズにより異なるが、各サイズの
記録紙Ｐの後端位置は、前記分岐部材４２と前記搬送ロ
ーラ４３のニップ位置との中間位置である。４４は大サ
イズ用紙の先端部に軽圧接して案内するガイド部材であ
る。On the reversing and re-feeding side of the recording paper, a reversing conveyance section 40 is provided.
, A recording paper introduction unit 50, an intermediate stacker unit 60, and a paper re-feeding unit 70. When the switching gate 32 is switched to the reverse re-feeding side, the passage a below the switching gate 32
Is passed through the transport roller 4 of the reverse transport section 40.
1 and passes through the passage b on the left side of the branch member 42 in the drawing, and further passes through the vertical passage c on the downstream side of the conveyance,
The sheet is conveyed while being pinched by a conveying roller 43 that can rotate forward and backward,
Thereafter, the path is bent horizontally in the curved path d, and the upper surface of the bottom plate 100 of the image forming apparatus main body and the sheet feeding tray 21
Horizontal passage e provided in the space formed between
And stops at a predetermined position. The leading end position of the sheet at the time of the stop differs depending on the size of the sheet, but the trailing end position of the recording sheet P of each size is an intermediate position between the nip position of the branch member 42 and the conveying roller 43. Reference numeral 44 denotes a guide member that guides the leading end of the large-size sheet by lightly pressing the sheet.
【００１７】前記の一時停止した記録紙Ｐの後端部は、
逆転駆動に切り換えられた搬送ローラ４３にニップされ
て、前記垂直通路ｃを上昇して、前記分岐部材４２内の
通路ｆを通過し、記録紙導入部５０により中間スタッカ
部６０に送り込まれる（排出通路ｇ）。The trailing end of the temporarily stopped recording paper P is
The sheet is nipped by the conveying roller 43 switched to the reverse rotation drive, rises in the vertical path c, passes through the path f in the branching member 42, and is sent to the intermediate stacker section 60 by the recording paper introducing section 50 (discharge). Passage g).
【００１８】図３は記録紙導入部５０の断面図、図４は
図３におけるＡ−Ａ断面図である。FIG. 3 is a cross-sectional view of the recording paper introduction unit 50, and FIG. 4 is a cross-sectional view taken along the line AA in FIG.
【００１９】前記中間スタッカ部６０の下流側上部に
は、駆動ローラ５１Ａと従動ローラ５１Ｂ間に巻回され
た搬送ベルト５２とバックアッププレート５３とが固定
位置に設けてある。前記駆動ローラ５１ＡはモータＭ１
により駆動され、搬送ベルト５２を回動する。A transport belt 52 wound between a driving roller 51A and a driven roller 51B and a backup plate 53 are provided at a fixed position on the downstream upper portion of the intermediate stacker section 60. The driving roller 51A is provided with a motor M1.
To rotate the transport belt 52.
【００２０】前記スタッカ本体６１の底部には、ワイヤ
巻回ドラム５４Ａが固定位置に設置され、モータＭ２に
より駆動回転される。該ワイヤ巻回ドラム５４Ａのドラ
ム面には複数の可動ワイヤ５５が巻回されていて一端が
係止されている。該可動ワイヤ５５の他端は、中間コロ
５４Ｂ、係止部材５４Ｃ間に伸縮可能に張設されてい
る。A wire winding drum 54A is installed at a fixed position on the bottom of the stacker main body 61, and is driven and rotated by a motor M2. A plurality of movable wires 55 are wound around the drum surface of the wire winding drum 54A, and one end is locked. The other end of the movable wire 55 is stretchably stretched between the intermediate roller 54B and the locking member 54C.
【００２１】前記搬送ベルト５２の下面側には、固定位
置で回転可能な従動ローラ５６Ａと、前記可動ワイヤ５
５とともに移動して回転可能な移動ローラ５６Ｂとが設
けてある。従動ローラ５６Ａ，５６Ｂは搬送ベルト５２
に圧接して従動回転する。A driven roller 56 A rotatable at a fixed position and a movable wire 5
5 and a rotatable moving roller 56B. The driven rollers 56A and 56B are
And is driven to rotate.
【００２２】前記係止部材５４Ｃと、前記従動ローラ５
６Ｂと、該従動ローラ５６Ｂを搬送ベルト側に付勢する
バネ手段とを支持するキャリッジ５００は、スタッカ本
体６１の両側壁に記録紙搬送方向と平行する方向に穿設
された長穴６１０に摺動して直線移動可能である。該キ
ャリッジ５００の移動は、前記モータＭ２から駆動伝達
手段を介して駆動される。The locking member 54C and the driven roller 5
The carriage 500 supporting the roller 6B and a spring means for urging the driven roller 56B toward the conveying belt slides in a slot 610 formed on both side walls of the stacker main body 61 in a direction parallel to the recording paper conveying direction. It can move and move linearly. The movement of the carriage 500 is driven by the motor M2 via drive transmission means.
【００２３】前記搬送ベルト５２と従動ローラ５６Ｂの
圧接位置からスタッカ本体６１内に排出された記録紙Ｐ
の先端部は、前記排出通路ｇの空間を通過して、スタッ
カ本体６１内の底面または該スタッカ本体６１内に積載
された先行の記録紙Ｐの上面に当接したのち、滑走して
突き当て面に移送される。The recording paper P discharged into the stacker main body 61 from the pressure contact position between the transport belt 52 and the driven roller 56B
After passing through the space of the discharge passage g and abutting on the bottom surface in the stacker main body 61 or the upper surface of the preceding recording paper P stacked in the stacker main body 61, slides and abuts. Transferred to the surface.
【００２４】前記キャリッジ５００の前記通路ｇの空間
は、上方の上案内部材５７の上傾斜案内面５７Ａと、下
方の下案内部材５８の下傾斜面５８Ａとにより形成され
ている。前記下傾斜案内面５８Ａは、前記搬送ベルト５
２と従動ローラ５６Ｂとが圧接する位置から放出された
記録紙Ｐの先端部が、斜め下方に進行して、前記スタッ
カ本体６１の記録紙載置面６１Ｂに前記スタッカ本体６
１の記録紙載置面６１Ｂに当接する角度を小さくするよ
うな傾斜角度θを有する斜面に形成されている。The space of the passage g of the carriage 500 is defined by an upper inclined guide surface 57A of the upper upper guide member 57 and a lower inclined surface 58A of the lower lower guide member 58. The lower inclined guide surface 58 </ b> A is
The leading end of the recording paper P discharged from the position where the second roller 2 and the driven roller 56B come into pressure contact with each other advances obliquely downward, and the stacker main body 6 contacts the recording paper mounting surface 61B of the stacker main body 61.
It is formed on an inclined surface having an inclination angle θ such that the angle at which it contacts the first recording paper mounting surface 61B is reduced.
【００２５】すなわち、前記搬送ベルト５２と従動ロー
ラ５６Ｂとが圧接する位置から放出された記録紙Ｐの先
端部が、斜め下方に進行して、前記下案内部材５８の下
傾斜案内面５８Ａに当接して、該下傾斜案内面５８Ａに
沿って摺動し、この下傾斜案内面５８Ａの緩傾斜角度θ
で前記スタッカ本体６１の記録紙載置面６１Ｂに進入
し、さらに該記録紙載置面６１Ｂ上を滑走して、突き当
て面６１Ａに当接して停止する。That is, the leading end of the recording paper P discharged from the position where the conveying belt 52 and the driven roller 56B are pressed against each other, advances obliquely downward and hits the lower inclined guide surface 58A of the lower guide member 58. , And slides along the lower inclined guide surface 58A, and the gentle inclination angle θ of the lower inclined guide surface 58A.
Then, the sheet enters the recording paper mounting surface 61B of the stacker main body 61, slides on the recording paper mounting surface 61B, abuts against the abutting surface 61A, and stops.
【００２６】前記下傾斜案内面５８Ａを有する下案内部
材５８を設けることにより、下方に湾曲したカールを有
する記録紙Ｐが、前記スタッカ本体６１に送り込まれた
とき、記録紙Ｐの先端部が、記録紙載置面６１Ｂに前記
傾斜角度θより大きい角度で当接して、巻き込み状態と
なる給紙不良の発生が防止される。By providing the lower guide member 58 having the lower inclined guide surface 58A, when the recording paper P having a curl curving downward is fed into the stacker main body 61, the leading end of the recording paper P is The recording paper placement surface 61B is abutted at an angle larger than the inclination angle θ to prevent the occurrence of a paper feed failure that may be entangled.
【００２７】図５は、本発明の請求項２の実施の形態を
示す両面画像形成装置の模式図である。なお、図面に使
用されている符号について、前記実施の形態と同じ機能
を有する部分には同符号を付している。また、前記の実
施の形態と異なる点を説明する。FIG. 5 is a schematic diagram of a double-sided image forming apparatus according to a second embodiment of the present invention. Note that, in the reference numerals used in the drawings, portions having the same functions as those in the above-described embodiment are denoted by the same reference numerals. Further, points different from the above embodiment will be described.
【００２８】中間スタッカ部６０のスタッカ本体６１の
上方には、複数の記録紙サイズにそれぞれ対応して固定
配置された複数の記録紙導入部５１０Ａ，５１０Ｂ，５
１０Ｃが固定配置されている。これら記録紙導入部５１
０（Ａ，Ｂ，Ｃ）は、搬送ローラ５１１、切換ゲート５
１２、上案内部材５１３をそれぞれ有する。Above the stacker main body 61 of the intermediate stacker section 60, a plurality of recording paper introduction sections 510A, 510B, 5 fixedly disposed corresponding to a plurality of recording paper sizes, respectively.
10C is fixedly arranged. These recording paper introduction units 51
0 (A, B, C) indicates the conveying roller 511 and the switching gate 5
12 and an upper guide member 513.
【００２９】スタッカ本体６１の内部には、前記下案内
部材５８と後端ストッパ５９から成るユニットがキャリ
ッジに搭載されて記録紙搬送方向に移動可能であり、記
録紙サイズに対応した所定位置で停止する。Inside the stacker main body 61, a unit composed of the lower guide member 58 and the rear end stopper 59 is mounted on a carriage and is movable in the recording paper conveying direction, and stops at a predetermined position corresponding to the recording paper size. I do.
【００３０】下案内部材５８の下傾斜案内面５８Ａは、
前述の実施の形態と同様に、記録紙の先端部を円滑に誘
導し、スタッカ本体内に搬送し収容する。The lower inclined guide surface 58A of the lower guide member 58 is
As in the above-described embodiment, the leading end of the recording paper is guided smoothly, and is conveyed and accommodated in the stacker main body.
【００３１】次に、本発明の請求項３の実施の形態を、
図６及び図７により説明する。図６は両面画像形成の制
御手段の制御を示すブロック図、図７は記録紙導入部に
おける制御手段および用紙搬送速度制御のタイミングチ
ャートを示す。Next, a third embodiment of the present invention will be described.
This will be described with reference to FIGS. FIG. 6 is a block diagram showing the control of the control unit for the double-sided image formation, and FIG.
【００３２】図３において、前記記録紙Ｐが通過する通
路ｇの入口付近には、発光部８０１と受光部８０２から
成るセンサが設けてある。該センサの光路８０３を、記
録紙Ｐの先端部及び後端部が通過すると、検知信号が制
御手段８０に送られる。In FIG. 3, a sensor including a light emitting unit 801 and a light receiving unit 802 is provided near the entrance of the passage g through which the recording paper P passes. When the leading end and the trailing end of the recording paper P pass through the optical path 803 of the sensor, a detection signal is sent to the control means 80.
【００３３】（１）画像形成装置本体側から用紙サイズ
信号が制御手段８０に送られると、記録紙導入部５０の
キャリッジ５００がモータＭ２の駆動により移動され
て、用紙サイズに対応した所定位置で停止する。(1) When a paper size signal is sent from the main body of the image forming apparatus to the control means 80, the carriage 500 of the recording paper introduction unit 50 is moved by driving the motor M2, and is moved to a predetermined position corresponding to the paper size. Stop.
【００３４】（２）記録紙反転搬送に切り換えられる
と、モータＭ３の逆転駆動により搬送ローラ４３が逆転
し、ほぼ同時にモータＭ１の駆動により搬送ベルト５２
が回動を開始する。(2) When the recording paper is switched to reverse transport, the transport roller 43 rotates reversely by the reverse drive of the motor M3, and the transport belt 52 is driven almost simultaneously by the drive of the motor M1.
Starts rotating.
【００３５】（３）片面記録済みの記録紙Ｐの先端部
が、反転用の通路ｃ，ｆを通過して、回動する搬送ベル
ト５２と従動ローラ５６Ａ，５６Ｂとの圧接位置を通過
して、前記排出通路ｇに排出される。この反転搬送時の
記録紙搬送速度は、例えば６００ｍｍ／ｓｅｃの高速搬
送である。(3) The leading end of the recording paper P on which one-side recording has been performed passes through the reversing passages c and f, and passes through the pressure contact position between the rotating transport belt 52 and the driven rollers 56A and 56B. Are discharged to the discharge passage g. The recording paper transport speed during the reverse transport is a high-speed transport of, for example, 600 mm / sec.
【００３６】（４）記録紙Ｐの先端部が前記センサの光
路８０３を通過したことを、センサ（受光部５０２）が
検知すると、制御手段８０はモータＭ１を低速に切り換
え、搬送ベルト５２を低速で回動する。以後、記録紙Ｐ
は低速搬送（例えば４５０ｍｍ／ｓｅｃ）されて、スタ
ッカ本体６１内に安定して収容される。(4) When the sensor (light receiving section 502) detects that the leading end of the recording paper P has passed the optical path 803 of the sensor, the control means 80 switches the motor M1 to a low speed, and controls the transport belt 52 to a low speed. To rotate. Thereafter, the recording paper P
Is transported at a low speed (for example, 450 mm / sec) and stably accommodated in the stacker main body 61.
【００３７】（５）記録紙Ｐの後端部が前記センサの光
路８０３を通過したことを、センサ（受光部５０２）が
検知すると、制御手段８０はモータＭ１の駆動を停止さ
せる。(5) When the sensor (light receiving unit 502) detects that the rear end of the recording paper P has passed the optical path 803 of the sensor, the control unit 80 stops driving the motor M1.
【００３８】（６）記録紙Ｐが大サイズの場合には、記
録紙Ｐは搬送ベルト５２と従動ローラ５６Ａ，５６Ｂに
挟持されるとともに、搬送ローラ４３にも挟持されてい
るので、記録紙Ｐの先端部が前記センサの光路８０３を
通過したことを、センサ（受光部５０２）が検知する
と、制御手段８０はモータＭ１，Ｍ３を低速に切り換
え、搬送ベルト５２と搬送ローラ４３とを等速の低速で
回動片面に画像形成済みの記録紙を記録紙導入部から収
納容器内に送り込み、該記録紙を再給紙部により画像形
成部に送り出して記録紙の両面に画像を形成する。(6) When the recording paper P is of a large size, the recording paper P is sandwiched between the transport belt 52 and the driven rollers 56A and 56B and also between the transport rollers 43. When the sensor (light receiving unit 502) detects that the leading end of the sensor has passed the optical path 803 of the sensor, the control unit 80 switches the motors M1 and M3 to low speed, and makes the transport belt 52 and the transport roller 43 move at a constant speed. The recording paper having an image formed on one side is rotated at a low speed from the recording paper introduction unit into the storage container, and the recording paper is sent out to the image forming unit by the re-feeding unit to form an image on both sides of the recording paper.
【００３９】前記収納容器に導入する記録紙の先端部が
前記記録紙導入部を通過する時に、該記録紙導入部通過
後の記録紙搬送速度を、前記記録紙導入部通過前の記録
紙搬送速度より低速に切り換え設定する制御を行う。When the leading end of the recording paper to be introduced into the storage container passes through the recording paper introduction section, the recording paper transportation speed after passing through the recording paper introduction section is changed by the recording paper transportation speed before passing through the recording paper introduction section. Control to switch to a lower speed than the speed is performed.
【００４０】[0040]
【発明の効果】前記したように、請求項１に記載の両面
画像形成装置は、反転搬送通路から記録紙サイズに対応
してスタッカ本体の記録紙搬送方向と平行する方向に移
動可能な記録紙導入部を経て中間スタッカ部に導入され
る記録紙が、導入される記録紙の下方経路を規制する傾
斜案内面を有する下案内部材により、スタッカ本体の記
録紙載置面に緩傾斜角で搬送されるから、片面記録済み
のカールした記録紙でも先端部の巻き込みを生じる事な
く安定してスタッカ本体内に収容される。As described above, in the double-sided image forming apparatus according to the first aspect, the recording paper movable in the direction parallel to the recording paper transporting direction of the stacker body in accordance with the recording paper size from the reverse transporting path. The recording paper introduced into the intermediate stacker through the introduction unit is conveyed at a gentle inclination angle to the recording paper mounting surface of the stacker main body by the lower guide member having an inclined guide surface that regulates the lower path of the recording paper to be introduced. As a result, even a curled recording sheet on which single-side recording has been performed can be stably stored in the stacker main body without causing the leading end portion to be caught.
【００４１】請求項２に記載の両面画像形成装置は、片
面に画像形成済みの記録紙を、複数の記録紙サイズにそ
れぞれ対応して固定配置された複数の記録紙導入部から
収納容器内に送り込み、該記録紙を再給紙部により画像
形成部に送り出して記録紙の両面に画像を形成する両面
画像形成装置において、導入される記録紙の下方経路を
規制する傾斜案内面を有する下案内部材を設けることに
より、請求項１と同様な効果が得られる。According to a second aspect of the present invention, in the double-sided image forming apparatus, a recording sheet having an image formed on one side is inserted into a storage container from a plurality of recording sheet introduction sections fixedly arranged corresponding to a plurality of recording sheet sizes. In a double-sided image forming apparatus in which the recording paper is fed to the image forming unit by a re-feeding unit to form an image on both sides of the recording paper, a lower guide having an inclined guide surface for regulating a lower path of the recording paper to be introduced By providing the member, the same effect as in the first aspect can be obtained.
【００４２】請求項３に記載の両面画像形成装置は、ス
タッカ本体に導入する記録紙の先端部が前記記録紙導入
部を通過する時に、該記録紙導入部通過後の記録紙搬送
速度を、前記記録紙導入部通過前の記録紙搬送速度より
低速に切り換え設定する制御手段を備えることにより、
記録紙の高速搬送による記録紙反転搬送時間の短縮と、
片面記録済みのカールを生じた記録紙を中間スタッカ内
へ搬入する時にも、安定した搬送速度で送り込むことに
より、記録紙搬送不良が解消される。According to a third aspect of the present invention, when the leading end portion of the recording paper to be introduced into the stacker body passes through the recording paper introduction section, the recording paper conveyance speed after passing through the recording paper introduction section is set to: By providing control means for switching and setting to a lower speed than the recording paper conveyance speed before passing through the recording paper introduction section,
Shortening of the recording paper reversal conveyance time by high speed conveyance of the recording paper,
Even when the curled recording paper on which single-side recording has been performed is carried into the intermediate stacker, the recording paper is transported at a stable transportation speed, thereby eliminating the recording paper transportation failure.
【図１】画像形成装置の概略構成図。FIG. 1 is a schematic configuration diagram of an image forming apparatus.
【図２】画像形成装置の用紙搬送経路を示す模式図。FIG. 2 is a schematic diagram illustrating a sheet conveyance path of the image forming apparatus.
【図３】記録紙導入部の断面図。FIG. 3 is a cross-sectional view of a recording paper introduction unit.
【図４】記録紙導入部のＡ−Ａ断面図。FIG. 4 is a sectional view of the recording paper introduction section taken along line AA.
【図５】本発明の請求項２の実施の形態を示す両面画像
形成装置の模式図。FIG. 5 is a schematic diagram of a double-sided image forming apparatus according to a second embodiment of the present invention.
【図６】本発明の請求項３の実施の形態の両面画像形成
の制御を示すブロック図。FIG. 6 is a block diagram showing control of double-sided image formation according to the third embodiment of the present invention.
【図７】記録紙導入部における制御手段および用紙搬送
速度制御を示すタイミングチャート。FIG. 7 is a timing chart showing control means and paper conveyance speed control in a recording paper introduction unit.
１０ 画像形成部 ２０ 給紙部 ３０ 排紙部 ４０ 反転搬送部 ４３ 搬送ローラ ５０，５１０Ａ，５１０Ｂ，５１０Ｃ 記録紙導入部 ５２ 搬送ベルト ５５ 可動ワイヤ ５７ 上案内部材 ５７Ａ，５８Ａ 傾斜案内面 ５８ 下案内部材 ５９ 後端ストッパ ６０ 中間スタッカ部 ６１ スタッカ本体（容器本体、収納容器） ６１Ａ 突き当て面 ６１Ｂ 記録紙載置面 ７０ 再給紙部 ８０ 制御手段 ８０１ 発光部 ８０２ 受光部 ８０３ センサの光路 Ｐ 記録紙（用紙） DESCRIPTION OF SYMBOLS 10 Image forming part 20 Paper feed part 30 Discharge part 40 Reverse conveyance part 43 Conveyance rollers 50, 510A, 510B, 510C Recording paper introduction part 52 Conveyance belt 55 Movable wire 57 Upper guide member 57A, 58A Inclined guide surface 58 Lower guide member 59 Rear end stopper 60 Intermediate stacker unit 61 Stacker body (container body, storage container) 61A Butt surface 61B Recording paper placement surface 70 Refeed unit 80 Control means 801 Light emitting unit 802 Light receiving unit 803 Optical path of sensor P Recording paper ( Paper)
Claims (3)
入部から収納容器内に送り込み、該記録紙を再給紙部に
より画像形成部に送り出して記録紙の両面に画像を形成
する両面画像形成装置において、 前記記録紙導入部が記録紙サイズに対応して前記収納容
器の記録紙載置面と平行する方向に移動可能なユニット
に構成され、かつ、該ユニットが記録紙搬送手段と、導
入される記録紙の上方経路を規制する傾斜案内面を有す
る上案内部材と、導入される記録紙の下方経路を規制す
る傾斜案内面を有する下案内部材とから成ることを特徴
とする両面画像形成装置。1. A double-sided recording paper sheet on which an image is formed on one side is fed from a recording paper introduction section into a storage container, and the recording sheet is sent out to an image forming section by a re-feeding section to form images on both sides of the recording sheet. In the image forming apparatus, the recording paper introduction unit is configured as a unit movable in a direction parallel to a recording paper mounting surface of the storage container in accordance with a recording paper size, and the unit is provided with a recording paper conveying unit. An upper guide member having an inclined guide surface for regulating an upper path of the recording paper to be introduced, and a lower guide member having an inclined guide surface for regulating a lower path of the introduced recording paper. Image forming device.
記録紙サイズにそれぞれ対応して固定配置された複数の
記録紙導入部から収納容器内に送り込み、該記録紙を再
給紙部により画像形成部に送り出して記録紙の両面に画
像を形成する両面画像形成装置において、 前記複数の記録紙導入部が、導入される記録紙の上方経
路を規制する傾斜案内面を有する上案内部材と、導入さ
れる記録紙の下方経路を規制する傾斜案内面を有する下
案内部材とから成ることを特徴とする両面画像形成装
置。2. A recording paper having an image formed on one side is fed into a storage container from a plurality of recording paper introduction sections fixedly arranged corresponding to a plurality of recording paper sizes, and the recording paper is re-feeded. In the double-sided image forming apparatus for forming an image on both sides of the recording paper by sending the recording paper to the image forming unit, the plurality of recording paper introduction units have an inclined guide surface that regulates an upper path of the recording paper to be introduced. And a lower guide member having an inclined guide surface for regulating a lower path of the recording paper to be introduced.
入部から収納容器内に送り込み、該記録紙を再給紙部に
より画像形成部に送り出して記録紙の両面に画像を形成
する両面画像形成装置において、 前記収納容器に導入する記録紙の先端部が前記記録紙導
入部を通過する時に、該記録紙導入部通過後の記録紙搬
送速度を、前記記録紙導入部通過前の記録紙搬送速度よ
り低速に切り換え設定する制御手段を備えてなることを
特徴とする両面画像形成装置。3. A double-sided recording paper sheet on which an image is formed on one side is fed from a recording paper introduction section into a storage container, and the recording sheet is sent out to an image forming section by a re-feeding section to form images on both sides of the recording sheet. In the image forming apparatus, when the leading end of the recording paper to be introduced into the storage container passes through the recording paper introduction unit, the recording paper conveyance speed after passing through the recording paper introduction unit is changed to the recording speed before passing through the recording paper introduction unit. A double-sided image forming apparatus, comprising: a control unit for switching and setting the speed to be lower than the paper conveying speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8293657A JPH10142844A (en) | 1996-11-06 | 1996-11-06 | Both-side image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8293657A JPH10142844A (en) | 1996-11-06 | 1996-11-06 | Both-side image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10142844A true JPH10142844A (en) | 1998-05-29 |
Family
ID=17797567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8293657A Pending JPH10142844A (en) | 1996-11-06 | 1996-11-06 | Both-side image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10142844A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007022687A (en) * | 2005-07-12 | 2007-02-01 | Brother Ind Ltd | Image forming apparatus |
-
1996
- 1996-11-06 JP JP8293657A patent/JPH10142844A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007022687A (en) * | 2005-07-12 | 2007-02-01 | Brother Ind Ltd | Image forming apparatus |
| JP4645333B2 (en) * | 2005-07-12 | 2011-03-09 | ブラザー工業株式会社 | Image forming apparatus |
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