JPH10148973A - Both-side image forming device - Google Patents
Both-side image forming deviceInfo
- Publication number
- JPH10148973A JPH10148973A JP8307922A JP30792296A JPH10148973A JP H10148973 A JPH10148973 A JP H10148973A JP 8307922 A JP8307922 A JP 8307922A JP 30792296 A JP30792296 A JP 30792296A JP H10148973 A JPH10148973 A JP H10148973A
- Authority
- JP
- Japan
- Prior art keywords
- image forming
- branching
- forming apparatus
- recording paper
- opening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Counters In Electrophotography And Two-Sided Copying (AREA)
- Electrophotography Configuration And Component (AREA)
- Control Or Security For Electrophotography (AREA)
- Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (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
装置に関し、特に、片面に画像形成済みの記録紙を反転
搬送する反転搬送部に搬送路切り換え用の分岐手段を有
する両面画像形成装置に関する。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 an image on both sides of the recording paper, and more particularly, for reversing and conveying a recording sheet having an image formed on one side. The present invention relates to a double-sided image forming apparatus having a branching means for switching a conveyance path in a section.
【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、画像形成部において片面に画像形成済み
の記録紙は、定着装置により画像を定着され、排紙経路
から分岐され、下方又は上方の反転搬送部に導入され、
搬送ローラに挟持されて搬送され、所定位置の反転ポイ
ントでスイッチバックされたのち、分岐手段により前記
搬送路から分岐されて搬送され、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）内に表裏反転され
送り込まれて収容され、その後、再給紙部により前記画
像形成部に送り出され、記録紙の裏面に画像を形成され
たのち、機外に排出される。2. Description of the Related Art Conventionally, in a double-sided image forming apparatus of this type, a recording sheet having an image formed on one side in an image forming section is fed from a recording sheet storage container such as a sheet cassette by a sheet feeding section. The image is fixed by the fixing device, branched from the paper discharge path, and introduced into the lower or upper reversing transport section,
The sheet is conveyed while being nipped by the conveying rollers, switched back at a predetermined reversal point, branched off from the conveying path by a branching unit, conveyed, and fed from a recording paper introduction unit into a double-sided image forming storage container (intermediate stacker). The recording paper is sent to the image forming unit by a paper re-feeding unit, and an image is formed on the back surface of the recording paper, and then discharged out of the apparatus.
【０００３】前記両面画像形成装置本体内の反転搬送部
等の搬送路を有する本体側面の開口部は、開閉扉により
開閉可能に閉止される。該開閉扉には、前記反転搬送部
の搬送路を形成する一方のガイド板や、搬送ローラ対の
一方の従動ローラや、前記分岐手段の一方の分岐ガイド
部材等が取り付けられていて、該開閉扉を開放したと
き、前記反転搬送部の搬送路は開放状態になり、該搬送
路内に発生した搬送不良の記録紙を取り出し可能にして
いる。An opening on a side surface of the main body of the double-sided image forming apparatus having a conveyance path such as a reversing conveyance section is opened and closed by an opening / closing door. The opening / closing door is provided with one guide plate that forms a conveyance path of the reverse conveyance section, one driven roller of a conveyance roller pair, and one branch guide member of the branching unit, and the like. When the door is opened, the conveyance path of the reversing conveyance section is in an open state, so that a recording sheet having a conveyance failure generated in the conveyance path can be taken out.
【０００４】[0004]
【発明が解決しようとする課題】上述の両面画像形成装
置では、前記分岐手段の記録紙搬送出口から搬出された
記録紙は、前記記録紙導入部の入口部に正確に搬入され
ないと、記録紙搬送不良（ジャム等）を発生する。前記
分岐手段を画像形成装置本体側に固定すると、記録紙搬
送不良発生時に、該分岐手段内に滞留した記録紙を取り
出すのが困難である。このため、前記分岐手段を記録紙
搬送路を境にして、下方のガイド面を有する分岐部材
と、上方のガイド面を有する分岐部材とに分割し、下方
の分岐部材を画像形成装置本体側に固定配置し、上方の
分岐部材を前記開閉扉に取り付けるようにした。In the above-described double-sided image forming apparatus, the recording paper conveyed out of the recording paper conveyance outlet of the branching means must be accurately conveyed to the entrance of the recording paper introduction section. Transport failure (jam etc.) occurs. If the branching means is fixed to the image forming apparatus main body side, it is difficult to remove the recording paper staying in the branching means when a recording paper conveyance failure occurs. For this reason, the branching unit is divided into a branching member having a lower guide surface and a branching member having an upper guide surface with the recording paper conveyance path as a boundary, and the lower branching member is provided on the image forming apparatus main body side. It was fixedly arranged, and the upper branch member was attached to the opening / closing door.
【０００５】しかし、このような分割型の分岐手段にお
いては、揺動可能な開閉扉に取り付けられた上方の分岐
部材が、開閉扉を閉止したとき、前記下方の分岐部材に
対向する所定位置に正確に位置決めして設置することが
困難である。また、上方の分岐部材を開閉扉閉止時に正
確に位置決めするためには、開閉扉の揺動精度や分岐部
材の取り付け精度等を厳しい部品公差により管理した
り、組立調整に熟練と時間を要したりする。[0005] However, in such a split type branching means, the upper branch member attached to the swingable opening / closing door is located at a predetermined position facing the lower branch member when the opening / closing door is closed. It is difficult to accurately position and install. In addition, in order to accurately position the upper branch member when the door is closed, the swinging accuracy of the door and the mounting accuracy of the branch member are controlled by tight component tolerances, and it takes time and skill to assemble and adjust. Or
【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、前記分岐手段が画像形成装置内の所
定位置に正確に設置されるようにした両面画像形成装置
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 provides a double-sided image forming apparatus in which the branching means is accurately set at a predetermined position in the image forming apparatus. The purpose is to do.
【０００７】上記目的を達成する本発明の両面画像形成
装置は、画像形成部において片面に画像形成済みの記録
紙を反転搬送部に導入して表裏反転し、該記録紙を再給
紙部により前記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、前記反転搬
送部に搬送路切り換え用のガイド面を有する分岐手段を
設け、該分岐手段のガイド面を形成する少なくとも一つ
の分岐部材を開閉可能な保持部材に揺動可能に取り付
け、かつ、該分岐部材に位置決め用突起部を記録紙通過
部の外側に設けるとともに、前記画像形成装置本体側の
前記反転搬送部の記録紙通過部の外側に位置決め用案内
部を設け、前記保持部材を閉止したとき、前記位置決め
用突起部が前記位置決め用案内部に嵌合して、前記分岐
手段が画像形成装置内の所定位置に設置されるようにし
たことを特徴とするものである。According to the double-sided image forming apparatus of the present invention which achieves the above object, a recording sheet having an image formed on one side in an image forming section is introduced into a reversing conveyance section to be turned upside down, and the recording sheet is turned by a re-feed section. In a double-sided image forming apparatus that sends an image to the image forming unit and forms an image on both sides of a recording sheet, a branching unit having a guide surface for switching a conveyance path is provided in the reverse conveyance unit, and a guide surface of the branching unit is formed. At least one branch member is swingably attached to a holding member that can be opened and closed, and a positioning projection is provided on the branch member outside the recording paper passage section, and the reverse transport section on the image forming apparatus main body side. When the holding member is closed, the positioning projections are fitted to the positioning guides, and the branching means is provided in the image forming apparatus. It is characterized in that it has to be installed at a predetermined position of the.
【０００８】[0008]
【発明の実施の形態】以下、この発明の画像形成装置の
実施の形態を説明する。図１は、この画像形成装置の一
実施の形態を示す両面画像形成装置の概略構成図、図２
は両面画像形成装置の記録紙搬送経路を示す模式図であ
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the image forming apparatus according to the present invention will be described below. FIG. 1 is a schematic configuration diagram of a two-sided image forming apparatus showing an embodiment of the image forming apparatus.
FIG. 3 is a schematic diagram illustrating a recording paper conveyance path of the double-sided image forming apparatus.
【０００９】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を排出又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 recorded recording paper P from the transfer unit, a discharge path C for discharging the recording paper P on which an image has been formed outside the apparatus, A reversing paper feed path D for recirculating the recording paper P, on which an image is formed by the image forming unit 10, to the image forming unit 10 after reversing;
【００１０】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.
【００１１】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を収納する給紙カセット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 cassette 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. On the downstream side of the paper feed roller 23, a double feed prevention roller pair 24, 25 is arranged to send out the recording paper P one by one to the next process. The paper is fed to a second paper feed roller (registration roller) 28 via 26 and 27.
【００１２】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。更に、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, charging is performed again by the charger 12.
【００１３】定着装置１８は、内部にヒータを有する定
着ローラ（加熱ローラ）１８１と、該定着ローラ１８１
に強く圧接して従動する加圧ローラ１８２とから成り、
前記画像形成部１０から搬送された記録紙Ｐを圧接、挟
持して加熱することにより、記録紙Ｐ上に形成されたト
ナー像を定着する。The fixing device 18 includes a fixing roller (heating roller) 181 having a heater therein, and the fixing roller 181.
And a pressure roller 182 that is strongly pressed against and driven by
The recording paper P conveyed from the image forming unit 10 is pressed, pinched and heated to fix the toner image formed on the recording paper P.
【００１４】定着された記録紙Ｐは、排紙部３０に送り
出される。即ち、記録紙Ｐは定着装置１８の搬送下流側
に配置された定着排紙ローラ３１のニップ位置を通過
し、更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 fixed recording paper P is sent to a paper discharge unit 30. That is, the recording paper P passes through the nip position of the fixing discharge roller 31 disposed downstream of the fixing device 18 in the conveyance, and further, the discharge switching member (switch gate) 32 in the downstream of the conveyance.
As a result, the transport path of the recording paper P is switched between the discharge side and the reverse re-feed side. Recording paper P switched to the discharge side
Is passed through a passage above the switching gate 32 and is placed on a discharge tray 34 by a discharge roller 33.
【００１５】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。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.
【００１６】図３は、反転搬送部４０と記録紙導入部５
０の断面図である。FIG. 3 shows the reverse transport section 40 and the recording paper introduction section 5.
0 is a sectional view.
【００１７】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の導入ローラ（搬送ローラ）
４１を介して下方に搬送され、分岐手段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、正逆回転可能な反転搬送ローラ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本体骨格底板１００の上面と前
記給紙カセット２１の底面との間に形成された空間に設
けられたスイッチバック通路（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、前記分岐手段４２と前記反転搬送ローラ
４３のニップ位置との中間位置である。When the switching gate 32 is switched to the reverse re-feeding side, the recording paper P that has passed through the passage a below the switching gate 32 is introduced into the reverse transport section 40 by the introduction roller (transport roller).
It is conveyed downward through 41, passes through the left side path b of the branching means 42 in the figure, and further passes through a vertical path c on the downstream side of conveyance, and is conveyed while being pinched by a reversible conveyance roller 43 that can rotate forward and reverse, Thereafter, the path is bent in the horizontal direction in the curved path d, and a switchback path (horizontal) provided in a space formed between the upper surface of the main body frame bottom plate 100 of the image forming apparatus main body and the bottom surface of the paper feed cassette 21. The vehicle enters the passage (e) and temporarily stops at a predetermined position. The leading edge position of the sheet at the time of the stop varies depending on the sheet size.
The rear end position is an intermediate position between the nip position of the branching means 42 and the nip position of the reverse conveyance roller 43.
【００１８】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反転搬送ローラ４３にニップ
されて、前記垂直通路ｃを上昇して、前記分岐手段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
It is nipped by the reversing conveyance roller 43 switched to the reverse rotation drive, ascends the vertical path c, and
Then, the recording paper is fed into the intermediate stacker 60 by the recording paper introduction unit 50 (discharge passage g).
【００１９】前記反転搬送部４０の反転搬送ローラ４３
の正転搬送下流側の記録紙搬送通路のうち、画像形成装
置本体の本体骨格底板１００の上面１００Ａと、前記給
紙カセット２１の底面２１Ａとの間に形成された狭い空
間に、１枚の記録紙Ｐが一時収容可能なスイッチバック
通路（水平通路）ｅを設けた。４４は大サイズ用紙の先
端部に軽圧接して案内する押圧レバーである。なお、前
記本体骨格底板１００の上面１００Ａに図示しないリブ
を形成することにより、記録紙Ｐのスイッチバック搬送
を円滑にするとともに、前記本体骨格底板１００を補強
する。The reverse transport roller 43 of the reverse transport section 40
Of the recording paper conveyance path on the downstream side of the normal rotation conveyance in the narrow space formed between the upper surface 100A of the main body frame bottom plate 100 of the image forming apparatus main body and the bottom surface 21A of the paper feed cassette 21. A switchback passage (horizontal passage) e capable of temporarily storing the recording paper P is provided. Reference numeral 44 denotes a pressing lever that guides the leading end of the large-size sheet by light pressure contact. By forming a rib (not shown) on the upper surface 100A of the main body skeleton bottom plate 100, switchback conveyance of the recording paper P is smoothly performed, and the main body skeleton bottom plate 100 is reinforced.
【００２０】前記反転搬送ローラ４３の記録紙正転搬送
方向の下流側に、記録紙の先端部通過を検知する検知手
段を設けた。該検知手段は、検知部材４５と光センサＰ
Ｓ３とから構成されている。検知部材４５はアクチュエ
ータ部４５Ａと遮光部４５Ｂと支軸４５Ｃとから成る一
体成型部材である。支軸４５Ｃは反転搬送部４０の図示
しない固定軸受に回転自在に支持されている。A detecting means for detecting the passage of the leading end of the recording paper is provided downstream of the reversing transport roller 43 in the recording paper normal transport direction. The detecting means includes a detecting member 45 and an optical sensor P.
S3. The detection member 45 is an integrally molded member including an actuator portion 45A, a light shielding portion 45B, and a support shaft 45C. The support shaft 45C is rotatably supported by a fixed bearing (not shown) of the reversing conveyance section 40.
【００２１】前記アクチュエータ部４５Ａは前記反転搬
送ローラ４３の下流側の垂直通路ｃを通過する記録紙Ｐ
に接触して揺動される。該アクチュエータ部４５Ａと一
体をなす遮光部４５Ｂは、前記光センサＰＳ３の検知光
路を遮断又は透過する。前記光センサＰＳ３はフォトイ
ンタラプタ型の光センサである。The actuator section 45A is connected to a recording paper P passing through a vertical path c on the downstream side of the reverse conveying roller 43.
It is rocked in contact with. The light shielding part 45B integrated with the actuator part 45A blocks or transmits the detection optical path of the optical sensor PS3. The optical sensor PS3 is a photo interrupter type optical sensor.
【００２２】前記中間スタッカ部６０の上流側上部に
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５２３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 upper portion of the upstream side of the intermediate stacker section 60. The driving roller 51A is provided with a motor M1.
To rotate the transport belt 523.
【００２３】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
ム面には可動ワイヤ５５が複数回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 movable wire 55 is wound a plurality of times on 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.
【００２４】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 56A 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.
【００２５】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
6B and a carriage supporting a spring means for urging the driven roller 56B toward the conveying belt, the stacker main body 61
Can be moved linearly by sliding in an elongated hole 610 formed in a side wall parallel to the recording paper conveying direction. The movement of the carriage is driven by the motor M2 via drive transmission means.
【００２６】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内の底面又は該スタッカ本体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６１Ａに移送される。The recording paper P discharged into the stacker main body 61 from the pressure contact position between the conveyor 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, the leading end slides and abuts. It is transferred to the surface 61A.
【００２７】図４は、排紙部３０と反転搬送部４０と画
像形成装置本体側面部の開閉扉開閉機構とを示す正面断
面図である。図５は、前記開閉扉を開放状態にした画像
形成装置本体側面部の正面断面図、図６は前記開閉扉開
放状態の斜視図である。図７は上記開閉扉開閉機構の要
部斜視図である。FIG. 4 is a front sectional view showing the sheet discharging unit 30, the reversing and conveying unit 40, and an opening / closing door opening / closing mechanism on the side of the image forming apparatus main body. FIG. 5 is a front sectional view of a side portion of the image forming apparatus main body in which the opening and closing door is opened, and FIG. 6 is a perspective view of the opening and closing door in the opened state. FIG. 7 is a perspective view of a main part of the door opening / closing mechanism.
【００２８】画像形成装置本体左側面部には、排紙部３
０と反転搬送部４０等が配置され、開閉扉により本体左
側面部の開口部が開閉可能になっている。開閉扉は、下
開閉扉１０１と上開閉扉１０２の屈曲式２段構成になっ
ている。下開閉扉１０１は、画像形成装置本体底部に固
定された揺動中心軸１０３に枢支され、揺動回転可能に
なっている。上開閉扉１０２は、下開閉扉１０１上部に
固定された揺動中心軸１０４に枢支され、揺動回転可能
になっている。前記画像形成装置本体底部と前記上開閉
扉１０２とは揺動自在なステーバー１０５により連結さ
れ、下開閉扉１０１を開放状態にしたとき、ステーバー
１０５は前記上開閉扉１０２をほぼ垂直状態に支持す
る。前記２箇所の揺動中心軸１０３，１０４から成る２
段関節に支持された２個の開閉扉１０１，１０２は、開
閉扉の開閉時に、画像形成装置本体側方の占有空間を少
なくすることができるから、画像形成装置を狭い場所に
設置して、側面の開閉扉を開閉することができる。On the left side of the main body of the image forming apparatus, a paper discharge unit 3 is provided.
0, a reverse transport section 40 and the like are arranged, and an opening on the left side of the main body can be opened and closed by an opening and closing door. The opening / closing door has a two-stage bending structure including a lower opening / closing door 101 and an upper opening / closing door 102. The lower opening / closing door 101 is pivotally supported by a swing center shaft 103 fixed to the bottom of the image forming apparatus main body, and is swingably rotatable. The upper opening / closing door 102 is pivotally supported by a swing center shaft 104 fixed to the upper portion of the lower opening / closing door 101, and is swingably rotatable. The bottom of the image forming apparatus main body and the upper opening / closing door 102 are connected by a swingable stay bar 105, and when the lower opening / closing door 101 is opened, the stay bar 105 supports the upper opening door 102 in a substantially vertical state. . 2 composed of the two swing center shafts 103 and 104
The two open / close doors 101 and 102 supported by the step joint can reduce the occupied space on the side of the image forming apparatus main body when the open / close door is opened / closed. The side door can be opened and closed.
【００２９】前記上開閉扉１０２の上部には、可動ロッ
ク爪部材１０６が支点軸１０６Ａにより揺動可能に支持
されている。該可動ロック爪部材１０６は、中央部の前
記支点軸１０６Ａを支点とし、一方の端部の力点は把持
部１０６Ｂ、他方の端部の作用点はロック爪部１０６Ｃ
を形成している。該ロック爪部１０６Ｃは後述の捩りコ
イルバネ１１２の付勢により、画像形成装置本体側の係
止部材１２１に係脱可能に係合する。A movable lock claw member 106 is swingably supported by a fulcrum shaft 106A above the upper door 102. The movable lock claw member 106 has the fulcrum shaft 106A at the center as a fulcrum, the point of force at one end is the gripper 106B, and the point of action at the other end is the lock claw 106C.
Is formed. The lock claw portion 106C is detachably engaged with a locking member 121 on the image forming apparatus main body side by the bias of a torsion coil spring 112 described later.
【００３０】前記ロック爪部１０６Ｃの近傍には、連結
棒１０７が貫通、軸止されている。該連結棒１０７の両
端部には、２本の連結桿１０８（Ｆ），１０８（Ｒ）の
上端部が回転可能に保持されている。In the vicinity of the lock claw portion 106C, a connecting rod 107 is penetrated and axially fixed. At both ends of the connecting rod 107, upper ends of two connecting rods 108 (F) and 108 (R) are rotatably held.
【００３１】前側（図６に示す画像形成装置本体の操作
者に対面する側Ｆ）の連結桿１０８（Ｆ）の下端部は、
可動係止爪部材１１０の突起軸部１１０Ａに接続してい
る。該可動係止爪部材１１０の基部１１０Ｂは前記揺動
中心軸１０４の一方の端部に嵌入されて、揺動可能に支
持されている。前記揺動中心軸１０４の軸径に装着され
た捩りコイルバネ１１２は、前記可動係止爪部材１１０
の先端部のロック爪部１１０Ｃを上方にバネ付勢すると
ともに、連結桿１０８（Ｆ）、連結棒１０７を介して前
記ロック爪部１０６Ｃを上方にバネ付勢する。The lower end of the connecting rod 108 (F) on the front side (the side F facing the operator of the image forming apparatus main body shown in FIG. 6)
It is connected to the projection shaft 110A of the movable locking claw member 110. A base 110B of the movable locking claw member 110 is fitted into one end of the swing center shaft 104 and is swingably supported. The torsion coil spring 112 mounted on the axis diameter of the swing center shaft 104 is
The spring is urged upward on the lock claw 110C at the distal end, and the lock claw 106C is spring urged upward via the connecting rod 108 (F) and the connecting rod 107.
【００３２】前記ロック爪部１０６Ｃは画像形成装置本
体側の係止部材１２２にバネ付勢されて係脱可能に係合
する。The lock claw portion 106C is spring-biased and engages with the locking member 122 on the image forming apparatus main body side in a detachable manner.
【００３３】後側（図６に示す画像形成装置本体の背面
側Ｒ）の連結桿１０８（Ｒ）の下端部は、可動係止爪部
材１１１の突起軸部１１１Ａに接続している。該可動係
止爪部材１１１の基部１１１Ｂは前記揺動中心軸１０４
の他方の端部に嵌入されて、揺動可能に支持されてい
る。前記揺動中心軸１０４の軸径に装着された捩りコイ
ルバネ１１２は、前記可動係止爪部材１１１の先端部の
ロック爪部１０６Ｃを上方にバネ付勢するとともに、連
結桿１０８（Ｆ）、連結棒１０７を介して前記ロック爪
部１０６Ｃを上方にバネ付勢する。The lower end of the connecting rod 108 (R) on the rear side (the rear side R of the image forming apparatus main body shown in FIG. 6) is connected to the projection shaft 111 A of the movable locking claw member 111. The base 111B of the movable locking claw member 111 is
Is fitted into the other end and is swingably supported. The torsion coil spring 112 mounted on the shaft diameter of the swing center shaft 104 urges the lock claw 106C at the distal end of the movable locking claw member 111 upward, and also connects the connecting rod 108 (F) to the connecting rod 108 (F). The lock claw portion 106C is spring-biased upward through the rod 107.
【００３４】前記ロック爪部１０６Ｃは画像形成装置本
体側の係止部材１２２にバネ付勢されて係脱可能に係合
する。The lock claw portion 106C is spring-biased and engages with the locking member 122 on the image forming apparatus main body side in a detachable manner.
【００３５】図８は、前記可動係止爪部材１１０，１１
１の形状を比較する正面図であり、図８（ａ）は前記前
側の可動係止爪部材１１０を示す正面図、図８（ｂ）は
後側の可動係止爪部材１１１の形状を示す正面図であ
る。FIG. 8 shows the movable locking claw members 110 and 11.
FIG. 8A is a front view illustrating the front movable locking claw member 110, and FIG. 8B is a front view illustrating the shape of the rear movable locking claw member 111. It is a front view.
【００３６】前記前側の可動係止爪部材１１０は、前記
揺動中心軸１０４が固定される基部１１０Ａと、前記連
結桿１０８（Ｆ）に接続する突起軸部１１０Ｂと、前記
係止部材１２２のストッパ面に当接する係止面１１０Ｃ
と、画像形成装置の前側の係止手段の係止部材１２２
（Ｆ）に摺接する案内面（傾斜面）１１０Ｄと、ロック
爪先端部１１０Ｅとから形成されている。The front movable locking claw member 110 includes a base 110A to which the swing center shaft 104 is fixed, a projection shaft 110B connected to the connecting rod 108 (F), and a locking member 122. Locking surface 110C that contacts the stopper surface
Locking member 122 of the locking means on the front side of the image forming apparatus
It is formed of a guide surface (inclined surface) 110D slidingly contacting (F) and a lock claw tip 110E.
【００３７】前記後側の可動係止爪部材１１１は、前記
揺動中心軸１０４が固定される基部１１１Ａと、前記連
結桿１０８（Ｒ）に接続する突起軸部１１１Ｂと、前記
係止部材１２２（Ｒ）のストッパ面に当接する係止面１
１１Ｃと、画像形成装置の前側の係止手段の係止部材１
２２（Ｆ）に摺接する案内面（傾斜面）１１１Ｄと、ロ
ック爪先端部１１１Ｅとから形成されている。The rear movable locking claw member 111 includes a base 111A to which the swing center shaft 104 is fixed, a protruding shaft 111B connected to the connecting rod 108 (R), and the locking member 122. (R) Locking surface 1 that abuts against the stopper surface
11C and the locking member 1 of the locking means on the front side of the image forming apparatus
It is formed of a guide surface (inclined surface) 111D slidingly in contact with 22 (F) and a lock claw tip 111E.
【００３８】前記前側の可動係止爪部材１１０と、後側
の可動係止爪部材１１１とは、基部から係止面までは同
一形状をなすが、後側の可動係止爪部材１１１の案内面
（傾斜面）１１１Ｄと、ロック爪先端部１１１Ｅとは、
前側の可動係止爪部材１１０に比して、前記揺動中心軸
１０４より遠い位置にあり、前記係止部材１２２（Ｒ）
に早期に当接する。The front movable locking claw member 110 and the rear movable locking claw member 111 have the same shape from the base to the locking surface, but guide the rear movable locking claw member 111. The surface (inclined surface) 111D and the lock claw tip 111E
As compared with the movable locking claw member 110 on the front side, the locking member 122 (R) is located at a position farther from the swing center shaft 104.
Contact early.
【００３９】図９（ａ），（ｂ）は、前記可動係止爪部
材１１０，１１１が同一形状をなした場合の係合状態を
示す。図９（ａ）は、前記開閉扉１０１，１０２を閉止
するとき、該開閉扉１０１，１０２の前側（Ｆ）を押さ
え付けた場合、該開閉扉１０１，１０２が変形して、破
線で示す前側の可動係止爪部材１１０と実線で示す後側
の可動係止爪部材１１１との取り付け位置が距離Ｌ１だ
けずれ、かつ、両可動係止爪部材１１０，１１１が角度
θ１だけ傾斜して、前側の可動係止爪部材１１０の係止
面１１０Ｃの一部が前記係止部材１２２（Ｆ）の係止面
１２２Ｂの一部に不安定係合した状態を示す。この状態
で、後側の可動係止爪部材１１１の先端部近傍の案内面
（傾斜面）１１１Ｄは、前記係止部材１２２（Ｒ）の案
内面（傾斜面）１２２Ａに当接した状態でロックされて
いない。FIGS. 9A and 9B show an engagement state when the movable locking claw members 110 and 111 have the same shape. FIG. 9A shows that when the front sides (F) of the doors 101 and 102 are pressed when the doors 101 and 102 are closed, the doors 101 and 102 are deformed and the front side indicated by a broken line is shown. The mounting position between the movable locking claw member 110 and the rear movable locking claw member 111 indicated by a solid line is shifted by a distance L1, and both movable locking claw members 110 and 111 are inclined by an angle θ1 to be on the front side. 7 shows a state in which a part of the locking surface 110C of the movable locking claw member 110 is unstablely engaged with a part of the locking surface 122B of the locking member 122 (F). In this state, the guide surface (inclined surface) 111D near the tip of the rear movable locking claw member 111 is locked in a state in which it abuts the guide surface (inclined surface) 122A of the locking member 122 (R). It has not been.
【００４０】図９（ｂ）は、前記開閉扉１０１，１０２
を閉止するとき、該開閉扉１０１，１０２の前側（Ｆ）
を押さえ付けた場合、該開閉扉１０１，１０２が変形し
て、破線で示す前側の可動係止爪部材１１０の基準位置
Ｇと、実線で示す後側の可動係止爪部材１１１との取り
付け位置が距離Ｌ２だけずれ、前側の可動係止爪部材１
１０の係止面１１０Ｃが前記係止部材１２２（Ｆ）の係
止面１２２Ｂに係合した状態を示す。この状態で、後側
の可動係止爪部材１１１の案内面（傾斜面）１１１Ｄ
は、前記係止部材１２２（Ｒ）の案内面（傾斜面）１２
２Ａに当接した状態でロックされていない。FIG. 9B shows the open / close doors 101 and 102.
When closing the door, the front side (F) of the doors 101 and 102
, The opening / closing doors 101 and 102 are deformed, and the reference position G of the front movable locking claw member 110 shown by a broken line and the mounting position of the rear movable locking claw member 111 shown by a solid line are attached. Is shifted by the distance L2, and the front movable locking claw member 1
10 shows a state in which ten locking surfaces 110C are engaged with the locking surfaces 122B of the locking members 122 (F). In this state, the guide surface (inclined surface) 111D of the rear movable locking claw member 111 is provided.
Are guide surfaces (inclined surfaces) 12 of the locking members 122 (R).
It is not locked in contact with 2A.
【００４１】図９（ｃ），（ｄ），（ｅ）は、前記可動
係止爪部材１１０，１１１が係止部材１２２に係止され
る過程を示す正面図である。FIGS. 9C, 9D and 9E are front views showing the process in which the movable locking claw members 110 and 111 are locked by the locking member 122. FIG.
【００４２】図９（ｃ）は本発明による後側の可動係止
爪部材１１１の案内面１１１Ｄが係止部材１２２（Ｒ）
の案内面１２２Ａに最初に当接した状態を示す。前記開
閉扉１０１，１０２を閉止するとき、該開閉扉１０１，
１０２の前側（Ｆ）を押さえ付けた場合、後側の可動係
止爪部材１１１を支持する揺動中心軸１０４は、前記図
９（ｂ）の破線で示す揺動中心軸１０４の基準位置Ｇか
ら遠い距離Ｌ３の位置にあり、この位置において後側の
可動係止爪部材１１１のみが前記係止部材１２２（Ｒ）
の案内面１２２Ａに当接する。FIG. 9C shows that the guide surface 111D of the rear movable locking claw member 111 according to the present invention has the locking member 122 (R).
Shows a state of first contact with the guide surface 122A. When the doors 101 and 102 are closed, the doors 101 and 102 are closed.
When the front side (F) of the base 102 is pressed, the swing center axis 104 supporting the rear movable locking claw member 111 is moved to the reference position G of the swing center axis 104 indicated by the broken line in FIG. Is located at a distance L3 far from the moving member, and at this position, only the rear movable locking claw member 111 is connected to the locking member 122 (R).
Abuts on the guide surface 122A.
【００４３】図９（ｄ）は、前記開閉扉１０１，１０２
を更に強く押さえ付けて閉止する中間過程を示す。開閉
扉１０１，１０２が更に強く押圧されると、後側の可動
係止爪部材１１１の案内面１１１Ｄは係止部材１２２
（Ｒ）の案内面１２２Ａに当接しながら角度θ２だけ揺
動し、同時に、前側の可動係止爪部材１１０を支持する
揺動中心軸１０４は、前記図９（ｂ）の破線で示す揺動
中心軸１０４の基準位置Ｇから距離Ｌ４の位置に前進し
て、後側の可動係止爪部材１１１を支持する揺動中心軸
１０４とほぼ一致する。FIG. 9D shows the open / close doors 101 and 102.
Fig. 4 shows an intermediate process of further pressing down and closing. When the doors 101 and 102 are further strongly pressed, the guide surface 111 </ b> D of the rear movable locking claw member 111 is locked by the locking member 122.
(R) swings by an angle θ2 while abutting on the guide surface 122A, and at the same time, the swing center shaft 104 supporting the front movable locking claw member 110 swings as indicated by the broken line in FIG. It advances forward from the reference position G of the center axis 104 to a position of a distance L4, and substantially coincides with the swing center axis 104 that supports the rear movable locking claw member 111.
【００４４】図９（ｅ）は、前記可動係止爪部材１１
０，１１１が係止部材１２２（Ｆ），１２２（Ｒ）に係
止されたロック状態を示す。開閉扉１０１，１０２が更
に強く押圧されると、前側の可動係止爪部材１１０の基
部１１０Ａと後側の可動係止爪部材１１１の基部１１１
Ａとが一致した関係位置となり、基準位置Ｇまで前進す
ると、前側の可動係止爪部材１１０の係止面１１０Ｃ
と、後側の可動係止爪部材１１１の係止面１１１Ｃとは
前記係止部材１２２（Ｆ），１２２（Ｒ）の係止面１２
２Ｂに同時に係合して、ロック状態に保持される。FIG. 9E shows the movable locking claw member 11.
0, 111 show a locked state in which the locking members 122 (F), 122 (R) are locked. When the doors 101 and 102 are further pressed, the base 110A of the front movable locking claw member 110 and the base 111 of the rear movable locking claw member 111 are pressed.
A is a relational position that coincides with A, and when it advances to the reference position G, the locking surface 110C of the front movable locking claw member 110
And the locking surface 111C of the rear movable locking claw member 111 is the locking surface 12C of the locking members 122 (F) and 122 (R).
2B at the same time, and is held in the locked state.
【００４５】このようにして、前記開閉扉１０１，１０
２を閉止するとき、該開閉扉１０１，１０２の前側
（Ｆ）を押さえ付けた場合でも、先ず、後側（Ｒ）の可
動係止爪部材１１１の先端部が前記係止部材１２２
（Ｒ）に当接したのち、前側（Ｆ）の可動係止爪部材１
１０と後側の可動係止爪部材１１１の各係止面が同時に
係止部材１２２（Ｆ），１２２（Ｒ）に係合してロック
状態に保持されるから、前側（Ｆ）の可動係止爪部材１
１０のみロックされ、後側（Ｒ）の可動係止爪部材１１
１が未係合のままの、開閉扉が半開き状態になることが
防止される。In this manner, the doors 101, 10
When closing the door 2, even if the front side (F) of the doors 101, 102 is pressed down, first, the distal end of the movable locking claw member 111 on the rear side (R) is connected to the locking member 122.
(R), the movable locking claw member 1 on the front side (F)
10 and the respective locking surfaces of the rear movable locking claw member 111 are simultaneously engaged with the locking members 122 (F) and 122 (R) and held in the locked state, so that the front (F) movable locking member is held. Stopper member 1
10 is locked, and the rear (R) movable locking claw member 11 is locked.
This prevents the opening / closing door from being half-opened while 1 remains unengaged.
【００４６】図１０は、前記分岐手段４２を構成する可
動分岐部材４２Ｂの斜視図である。図３ないし図５にお
いて、反転搬送部４０の導入ローラ（搬送ローラ）４１
の下方で、前記記録紙導入部の上流側の入口部には、分
岐手段４２が設けられている。該分岐手段４２は、固定
分岐部材４２Ａと可動分岐部材４２Ｂとから成る。固定
分岐部材４２Ａは画像形成装置本体側に固定されてい
る。可動分岐部材４２Ｂは図５に示すように、下開閉扉
１０１に取り付けられている。FIG. 10 is a perspective view of the movable branching member 42B constituting the branching means 42. 3 to 5, the introduction roller (transport roller) 41 of the reversing transport unit 40 is used.
A branching means 42 is provided at the entrance on the upstream side of the recording paper introduction section below the recording paper introduction section. The branching means 42 includes a fixed branching member 42A and a movable branching member 42B. The fixed branching member 42A is fixed to the image forming apparatus main body side. The movable branch member 42B is attached to the lower opening / closing door 101 as shown in FIG.
【００４７】前記可動分岐部材４２Ｂは、複数の分岐板
４２１と、該分岐板４２１を貫通して支持する揺動軸４
２２と、前記複数の分岐板４２１のうち両端の分岐板の
記録紙通過部の外側に突出した２個の位置決め用突起部
４２３（Ｆ），４２３（Ｒ）とから形成されている。The movable branch member 42B includes a plurality of branch plates 421 and a swing shaft 4 that penetrates and supports the branch plates 421.
22, and two positioning projections 423 (F) and 423 (R) projecting outside the recording paper passage portions of the branch plates at both ends of the plurality of branch plates 421.
【００４８】前記揺動軸４２２は下開閉扉１０１の軸受
け部に揺動可能に支持されている。該揺動軸４２２は前
記複数の分岐板４２１にインサートされて一体成型加工
される。前記下開閉扉１０１に取り付けられた前記複数
の分岐板４２１は、下開閉扉１０１が開放状態のときに
は、前記揺動軸４２２を回転中心にして首振り揺動可能
である。The swing shaft 422 is swingably supported by a bearing portion of the lower door 101. The swing shaft 422 is inserted into the plurality of branch plates 421 and integrally molded. The plurality of branch plates 421 attached to the lower opening / closing door 101 are swingable about the swing shaft 422 when the lower opening / closing door 101 is in an open state.
【００４９】図１１は、前記下開閉扉１０１の閉止動作
により、前記可動分岐部材４２Ｂを画像形成装置本体に
位置決めする過程を示す要部断面図である。FIG. 11 is a sectional view of a main part showing a process of positioning the movable branch member 42B in the image forming apparatus main body by closing the lower opening / closing door 101.
【００５０】図１１（ａ）は、可動分岐部材４２Ｂを画
像形成装置本体に挿入する前の状態を示す要部断面図、
図１１（ｂ）は、この状態の他の要部断面図である。FIG. 11A is a sectional view of a main part showing a state before the movable branch member 42B is inserted into the image forming apparatus main body.
FIG. 11B is a sectional view of another main part in this state.
【００５１】画像形成装置本体側の前側（Ｆ）、後側
（Ｒ）２箇所の所定位置には、位置決め用案内部材１２
３（Ｆ），１２３（Ｒ）が固定されている。該位置決め
用案内部材１２３（Ｆ），１２３（Ｒ）は、Ｖ字形状の
開放口を有する導入部１２３Ａと、Ｕ字形状の案内溝を
有する位置決め溝部１２３Ｂとをから成る。A positioning guide member 12 is provided at two predetermined positions on the front (F) and rear (R) sides of the image forming apparatus main body.
3 (F) and 123 (R) are fixed. The positioning guide members 123 (F) and 123 (R) include an introduction portion 123A having a V-shaped opening and a positioning groove portion 123B having a U-shaped guide groove.
【００５２】開閉扉１０１，１０２が閉止されるに従
い、下開閉扉１０１に支持された可動分岐部材４２Ｂが
前記固定分岐部材４２Ａに接近し、更に、可動分岐部材
４２Ｂの前（Ｆ）、後（Ｒ）２箇所の両端の先端部に固
定された位置決め用突起部４２３（Ｆ），４２３（Ｒ）
が、それぞれ前後位置決め用案内部材１２３（Ｆ），１
２３（Ｒ）の導入部１２３Ａに沿って導入され、更に位
置決め溝部１２３Ｂに嵌入することにより、可動分岐部
材４２Ｂが所定位置に設置される。図１１（ｃ）は、可
動分岐部材４２Ｂを画像形成装置本体側の位置決め用案
内部材１２３（Ｆ），１２３（Ｒ）に挿入完了した停止
状態を示す要部断面図、図１１（ｄ）は、この状態の他
の要部断面図である。As the doors 101 and 102 are closed, the movable branch member 42B supported by the lower door 101 approaches the fixed branch member 42A, and further moves forward (F) and rearward (F) of the movable branch member 42B. R) Positioning projections 423 (F), 423 (R) fixed to the two ends at both ends.
Are front and rear positioning guide members 123 (F), 1 respectively.
The movable branch member 42B is installed at a predetermined position by being introduced along the introduction part 123A of 23 (R) and further fitted into the positioning groove part 123B. FIG. 11C is a cross-sectional view of a main part showing a stopped state in which the movable branch member 42B has been completely inserted into the positioning guide members 123 (F) and 123 (R) on the image forming apparatus main body side, and FIG. FIG. 11 is a cross-sectional view of another main part in this state.
【００５３】前記分岐手段４２を、固定分岐部材４２Ａ
と可動分岐部材４２Ｂとの分割構造となし、開閉扉１０
１，１０２の開放動作により、可動分岐部材４２Ｂを固
定分岐部材４２Ａから分離することにより、分岐手段４
２の搬送通路内に停留した記録紙Ｐや、導入ローラ４１
の下流の反転搬送通路内に停留した記録紙Ｐを容易に取
り出すことが可能である。The branching means 42 is connected to a fixed branching member 42A.
And a movable branch member 42B, and the opening and closing door 10
By separating the movable branching member 42B from the fixed branching member 42A by the opening operation of the first and second branch members 102,
The recording paper P stopped in the conveyance path 2 and the introduction roller 41
It is possible to easily take out the recording paper P stopped in the reverse conveyance path downstream of the recording paper P.
【００５４】また、このような分割構造の分岐手段４２
において、開閉扉１０１に取り付けられた可動分岐部材
４２Ｂは、開閉扉１０１，１０２が開放状態をにあると
きは、振り揺動可能な構造をなし、開閉扉１０１，１０
２が閉止されると、可動分岐部材４２Ｂの位置決め突起
部４２３（Ｆ），４２３（Ｒ）画像形成装置本体側の位
置決め用案内部材１２３（Ｆ），１２３（Ｒ）に嵌合し
て位置決めされるから、開閉扉１０１や可動分岐部材４
２Ｂの加工精度、組立精度や、開閉扉揺動による位置精
度の変動等にかかわらず、開閉扉１０１を閉止した画像
形成時には、固定分岐部材４２Ａと可動分岐部材４２Ｂ
とを正確に位置決めすることが可能である。これによ
り、固定分岐部材４２Ａと可動分岐部材４２Ｂとの間に
は、所定精度の平行間隙が形成され、この間隙の搬送通
路から記録紙Ｐは円滑に記録紙導入部５０の入口部に挿
入される。Further, the branching means 42 having such a divided structure.
The movable branch member 42B attached to the door 101 has a swingable structure when the doors 101 and 102 are in the open state, and the movable branch member 42B is swingable and swingable.
When the cover 2 is closed, the positioning protrusions 423 (F) and 423 (R) of the movable branch member 42B are fitted and positioned by the positioning guide members 123 (F) and 123 (R) on the image forming apparatus main body side. Door 101 and the movable branch member 4
Regardless of the processing accuracy of 2B, the assembling accuracy, the fluctuation of the positional accuracy due to the swing of the door, etc., when forming the image with the door 101 closed, the fixed branch member 42A and the movable branch member 42B
Can be accurately positioned. As a result, a parallel gap with a predetermined accuracy is formed between the fixed branch member 42A and the movable branch member 42B, and the recording paper P is smoothly inserted into the entrance of the recording paper introduction unit 50 from the transport path of this gap. You.
【００５５】以上の実施の形態は、可動分岐部材４２Ｂ
を開閉扉１０１に取り付けた例を示したが、本発明はこ
れに限定されるものではなく、前記開閉扉の内側の搬送
ガイド板の一方を開閉可能になし、該可動の搬送ガイド
板に前記可動分岐部材４２Ｂを揺動可能に取り付けても
よい。In the above embodiment, the movable branch member 42B
Although the example which attached to the opening and closing door 101 was shown, the present invention is not limited to this. One of the transfer guide plates inside the opening and closing door can be opened and closed, and the movable transfer guide plate is The movable branch member 42B may be swingably attached.
【００５６】[0056]
【発明の効果】以上説明したように、本発明の両面画像
形成装置は、反転搬送部に搬送路切り換え用のガイド面
を有する分岐手段を設け、該分岐手段のガイド面を形成
する少なくとも一つの分岐部材を開閉可能な開閉扉に揺
動可能に取り付け、かつ、該分岐部材に位置決め用の突
起部を記録紙通過部の外側に設けるとともに、前記画像
形成装置本体側の前記反転搬送部の記録紙通過部の外側
に位置決め用案内部を設け、前記保持部材を閉止したと
き、前記位置決め用の突起部が前記位置決め用案内部に
嵌合して、前記分岐手段が画像形成装置内の所定位置に
設置されるようにしたものであるから、開閉扉や可動分
岐部材の加工精度、組立精度や、開閉扉揺動による位置
精度の変動等にかかわらず、開閉扉を閉止した画像形成
時には、固定分岐部材の位置決め用案内部に正確に位置
決めすることが可能である。これにより、固定分岐部材
と可動分岐部材との間には、所定精度の平行間隙が形成
され、この間隙の搬送通路から記録紙Ｐは円滑に記録紙
導入部の入口部に挿入され、記録紙搬送不良の発生が防
止される。As described above, in the double-sided image forming apparatus of the present invention, the reversing conveyance section is provided with the branching means having the guide surface for switching the conveyance path, and at least one of the branching means forming the guide surface of the branching means. A branching member is swingably attached to an openable and closable door, and a positioning projection is provided on the branching member outside the recording paper passing portion, and the recording of the reversing conveyance portion on the image forming apparatus main body side is performed. A positioning guide section is provided outside the paper passage section, and when the holding member is closed, the positioning projection section fits into the positioning guide section, and the branching unit moves to a predetermined position in the image forming apparatus. It is fixed at the time of image formation with the door closed, regardless of the processing accuracy of the door or movable branch member, the assembly accuracy, and the positional accuracy fluctuation due to the swing of the door. Branch It is possible to accurately position the positioning guide portion of the timber. As a result, a parallel gap with a predetermined accuracy is formed between the fixed branch member and the movable branch member, and the recording paper P is smoothly inserted into the entrance of the recording paper introduction section from the transport path of the gap, and The occurrence of transport failure is prevented.
【図１】両面画像形成装置の概略構成図。FIG. 1 is a schematic configuration diagram of a double-sided image forming apparatus.
【図２】両面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 double-sided image forming apparatus.
【図３】反転搬送部と記録紙導入部の断面図。FIG. 3 is a cross-sectional view of a reverse conveyance unit and a recording paper introduction unit.
【図４】排紙部と反転搬送部と画像形成装置本体側面部
の開閉扉開閉機構とを示す正面断面図。FIG. 4 is a front sectional view showing a sheet discharge unit, a reverse transport unit, and an opening / closing door opening / closing mechanism on a side surface of the image forming apparatus main body.
【図５】開閉扉を開放状態にした画像形成装置本体側面
部の正面断面図。FIG. 5 is a front cross-sectional view of a side portion of the image forming apparatus main body with an opening / closing door opened.
【図６】開閉扉開放状態の斜視図。FIG. 6 is a perspective view of the open / close door being opened.
【図７】開閉扉開閉機構の要部斜視図。FIG. 7 is a perspective view of a main part of an opening / closing door opening / closing mechanism.
【図８】前側の可動係止爪部材と後側の可動係止爪部材
の形状を示す正面図。FIG. 8 is a front view showing the shapes of a front movable locking claw member and a rear movable locking claw member.
【図９】可動係止爪部材が係止部材に係止される過程を
示す説明図。FIG. 9 is an explanatory view showing a process in which the movable locking claw member is locked by the locking member.
【図１０】分岐手段を構成する可動分岐部材の斜視図。FIG. 10 is a perspective view of a movable branch member constituting the branching unit.
【図１１】下開閉扉の閉止動作により、可動分岐部材を
画像形成装置本体に位置決めする過程を示す要部断面
図。FIG. 11 is an essential part cross sectional view showing the process of positioning the movable branch member in the image forming apparatus main body by the closing operation of the lower opening / closing door.
【符号の説明】 １０ 画像形成部 ２０ 給紙部 ３０ 排紙部 ３２ 排紙切換部材（切換ゲート） ４０ 反転搬送部 ４１ 導入ローラ ４２ 分岐手段 ４２Ａ 固定分岐部材 ４２Ｂ 可動分岐部材 ４２１ 分岐板 ４２２ 揺動軸 ４２３ 位置決め用突起部 ４３ 反転搬送ローラ ５０ 記録紙導入部 ６０ 中間スタッカ部 ７０ 再給紙部 １０１ 下開閉扉（開閉扉） １０２ 上開閉扉（開閉扉） １０３，１０４ 揺動中心軸 １０６ 可動ロック爪部材 １０８（Ｆ，Ｒ） 連結桿 １１０ 可動係止爪部材（Ｆ） １１１ 可動係止爪部材（Ｒ） １１０Ｃ，１１１Ｃ 係止面 １１０Ｄ，１１１Ｄ 案内面（傾斜面） １２１ 係止部材 １２２（Ｆ，Ｒ） 係止部材 １２３（Ｆ，Ｒ） 位置決め用案内部材 Ｐ 記録紙（用紙）DESCRIPTION OF REFERENCE NUMERALS 10 image forming unit 20 paper feeding unit 30 paper discharging unit 32 paper discharging switching member (switching gate) 40 reverse conveying unit 41 introduction roller 42 branching unit 42A fixed branching member 42B movable branching member 421 branching plate 422 swing Shaft 423 Positioning projection 43 Reverse conveyance roller 50 Recording paper introduction unit 60 Intermediate stacker unit 70 Refeed unit 101 Lower opening / closing door (opening / closing door) 102 Upper opening / closing door (opening / closing door) 103, 104 Swing center axis 106 Movable lock Claw member 108 (F, R) Connecting rod 110 Movable locking claw member (F) 111 Movable locking claw member (R) 110 C, 111 C Lock surface 110 D, 111 D Guide surface (inclined surface) 121 Lock member 122 (F , R) Locking member 123 (F, R) Positioning guide member P Recording paper (paper)
Claims (4)
の記録紙を反転搬送部に導入して表裏反転し、該記録紙
を再給紙部により前記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
反転搬送部に搬送路切り換え用のガイド面を有する分岐
手段を設け、該分岐手段のガイド面を形成する少なくと
も一つの分岐部材を開閉可能な保持部材に揺動可能に取
り付け、かつ、該分岐部材に位置決め用突起部を記録紙
通過部の外側に設けるとともに、前記画像形成装置本体
側の前記反転搬送部の記録紙通過部の外側に位置決め用
案内部を設け、前記保持部材を閉止したとき、前記位置
決め用突起部が前記位置決め用案内部に嵌合して、前記
分岐手段が画像形成装置内の所定位置に設置されるよう
にしたことを特徴とする両面画像形成装置。1. A recording sheet having an image formed on one side in an image forming section is introduced into a reversing and conveying section and turned upside down, and the recording sheet is sent out to the image forming section by a re-feeding section to be printed on both sides of the recording sheet. In a double-sided image forming apparatus for forming an image, a branching unit having a guide surface for switching a conveyance path is provided in the reverse conveyance unit, and a holding member capable of opening and closing at least one branching member forming a guide surface of the branching unit is provided. The branch member is provided so as to be swingable, and a positioning projection is provided on the branch member outside the recording paper passage section, and a positioning guide section is provided outside the recording paper passage section of the reverse conveyance section on the image forming apparatus main body side. Wherein when the holding member is closed, the positioning projection is fitted to the positioning guide, and the branching means is installed at a predetermined position in the image forming apparatus. Image forming apparatus.
設置された固定分岐部材と、前記保持部材に揺動可能に
取り付けられた可動分岐部材とにより構成されているこ
とを特徴とする請求項１に記載の両面画像形成装置。2. The image forming apparatus according to claim 1, wherein the branching unit includes a fixed branching member provided on the image forming apparatus main body side and a movable branching member swingably attached to the holding member. Item 2. A double-sided image forming apparatus according to Item 1.
可能にする開閉扉であることを特徴とする請求項１又は
２に記載の両面画像形成装置。3. The double-sided image forming apparatus according to claim 1, wherein the holding member is an opening / closing door for opening and closing the reverse conveyance unit.
路切り換え用の手段であることを特徴とする請求項１な
いし３の何れか１項に記載の両面画像形成装置。4. The double-sided image forming apparatus according to claim 1, wherein the branching unit is a unit for switching a conveyance path without a driving source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30792296A JP3396832B2 (en) | 1996-11-19 | 1996-11-19 | Double-sided image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30792296A JP3396832B2 (en) | 1996-11-19 | 1996-11-19 | Double-sided image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10148973A true JPH10148973A (en) | 1998-06-02 |
| JP3396832B2 JP3396832B2 (en) | 2003-04-14 |
Family
ID=17974790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30792296A Expired - Fee Related JP3396832B2 (en) | 1996-11-19 | 1996-11-19 | Double-sided image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3396832B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6694116B2 (en) | 2001-01-22 | 2004-02-17 | Sharp Kabushiki Kaisha | Sheet-like object conveying apparatus |
| JP2011154229A (en) * | 2010-01-28 | 2011-08-11 | Brother Industries Ltd | Image forming apparatus |
| US8371582B2 (en) | 2009-06-29 | 2013-02-12 | Brother Kogyo Kabushiki Kaisha | Image forming apparatus |
| US11415917B2 (en) | 2020-07-22 | 2022-08-16 | Brother Kogyo Kabushiki Kaisha | Image forming apparatus |
-
1996
- 1996-11-19 JP JP30792296A patent/JP3396832B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6694116B2 (en) | 2001-01-22 | 2004-02-17 | Sharp Kabushiki Kaisha | Sheet-like object conveying apparatus |
| US6697590B2 (en) | 2001-01-22 | 2004-02-24 | Sharp Kabushiki Kaisha | Sheet-like object conveying apparatus with movable body exposing a conveying path |
| US8371582B2 (en) | 2009-06-29 | 2013-02-12 | Brother Kogyo Kabushiki Kaisha | Image forming apparatus |
| JP2011154229A (en) * | 2010-01-28 | 2011-08-11 | Brother Industries Ltd | Image forming apparatus |
| US11415917B2 (en) | 2020-07-22 | 2022-08-16 | Brother Kogyo Kabushiki Kaisha | Image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3396832B2 (en) | 2003-04-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |