JPH07309525A - Sheet carrying device and image forming device - Google Patents

Sheet carrying device and image forming device

Info

Publication number
JPH07309525A
JPH07309525A JP6099725A JP9972594A JPH07309525A JP H07309525 A JPH07309525 A JP H07309525A JP 6099725 A JP6099725 A JP 6099725A JP 9972594 A JP9972594 A JP 9972594A JP H07309525 A JPH07309525 A JP H07309525A
Authority
JP
Japan
Prior art keywords
sheet
conveying
image
carrying
conveyed
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
Application number
JP6099725A
Other languages
Japanese (ja)
Other versions
JP3257899B2 (en
Inventor
Toshiyuki Nagano
敏幸 長野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
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 Inc filed Critical Canon Inc
Priority to JP09972594A priority Critical patent/JP3257899B2/en
Publication of JPH07309525A publication Critical patent/JPH07309525A/en
Application granted granted Critical
Publication of JP3257899B2 publication Critical patent/JP3257899B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H45/00—Folding thin material
    • B65H45/12—Folding articles or webs with application of pressure to define or form crease lines
    • B65H45/14—Buckling folders

Landscapes

  • Paper Feeding For Electrophotography (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Facsimiles In General (AREA)
  • Facsimile Transmission Control (AREA)

Abstract

PURPOSE:To add a sheet folding function, besides a sheet reversing and carrying function, keep the security of document and have multi-function in a device by specifying the sheet carrying passage length between each carrying means, and changing the timing of change-over of the sheet carrying passage with a switching means. CONSTITUTION:Flappers 46, 47 as switching means switch the sheet carrying passage in the area surrounded by a first, a second and a third pairs of carrying rollers 40a, 40b, 41a, 41b, 42a, 42b. The flappers 46, 47 also drive the first pair of carrying rollers 40a, 40b, and switch the normal and reverse drive of the second pair of carrying rollers 41a, 4b on the basis of a detection by a sheet detecting sensor 50. In the case where the sheet carrying passage length between the first and the third pairs of carrying rollers is represented by L1, the sheet carrying passage length between the first and the second pairs of carrying rollers is represented by L2, the sheet carrying passage length between the second and the third pairs of carrying rollers is represented by L3, and the sheet length at the minimum size to be folded into two is represented by Lp, they are set so as to satisfy the relation L1, L2, L3>Lp/2.

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、複写機，レーザービー
ムプリンタ，ファクシミリ等の画像形成装置に装備され
るシート搬送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 sheet conveying device installed in an image forming apparatus such as a copying machine, a laser beam printer and a facsimile.

【０００２】[0002]

【従来の技術】従来、複写機等の画像形成装置において
は、画像形成、更には画像定着後のシートを排出部に至
るまでのシート搬送パスにフラッパ等のシート搬送路を
切り換える切換手段を設け、両面或いは多重画像形成の
場合には、反転部に導いてシートを表裏反転させて中間
トレイに積載させたり、或いは片面画像形成の場合に
は、上記切換手段によりシートを表裏反転させてフェイ
スダウン（画像面を下側にして）で頁順を揃えて装置外
の排出トレイ上に排出させたりしている。2. Description of the Related Art Conventionally, an image forming apparatus such as a copying machine is provided with a switching means for switching a sheet conveying path such as a flapper to a sheet conveying path for forming a sheet after image formation and image fixing to a discharge section. In the case of double-sided or multiple image formation, the sheet is guided to the reversal section to reverse the sheet and stack it on the intermediate tray, or in the case of single-sided image formation, the sheet is reversed by the switching means to face down. The pages are arranged in the same order (with the image side facing down) and discharged onto the discharge tray outside the device.

【０００３】[0003]

【発明が解決しようとする課題】しかしながら、上記従
来の複写機等においては、画像形成後のシートを排出ト
レイ上に排出したまま放置しておくと、フェースアップ
（画像面を上側にして）で排出する場合は直接他人の目
にふれやすく、たとえシートがフェースダウンで排出さ
れていても、他人の目にふれるおそれがあり、プリント
内容が機密文書等の重要性を帯びている場合には、機密
性が保持できない。However, in the above conventional copying machine and the like, if the sheet after the image formation is discharged and left on the discharge tray, it is face-up (the image surface is on the upper side). When ejecting, it is easy to touch other people's eyes directly, and even if the sheet is ejected face down, it may touch other people's eyes, and if the printed contents are important such as confidential documents, Confidentiality cannot be maintained.

【０００４】本発明の目的は、上記従来技術の課題を解
決し、シート反転搬送機能に加えてシートを折曲機能を
付加し、文書の機密性保持、装置の多機能化を実現した
シート搬送装置を提供することにある。An object of the present invention is to solve the above-mentioned problems of the prior art, and to add a sheet folding function in addition to the sheet reversing / conveying function, maintain the confidentiality of a document, and realize a multifunctional sheet conveying. To provide a device.

【０００５】[0005]

【課題を解決するための手段】前記従来技術の課題を解
決し、以下に述べる実施例に適用される代表的な手段
は、シートをほぼ水平方向に搬送するための第１，第３
搬送手段と、前記第１搬送手段により搬送されたシート
をほぼ垂直方向に搬送するための正逆転駆動される第２
搬送手段と、前記第１，第２，第３搬送手段に囲まれた
領域でシート搬送路を切り換える切換手段と、を備え、
前記第１，第３搬送手段間のシート搬送路長をＬ1 、前
記第１，第２搬送手段間のシート搬送路長をＬ2 、前記
第２，第３搬送手段間のシート搬送路長をＬ3 、シート
長をＬP とすると、Ｌ1 ，Ｌ2 ，Ｌ 3 ＞ＬP ／２であ
り、前記切換手段は、シート搬送路の切り換えのタイミ
ングを変えることで、シートの表裏を入れ替える反転手
段と、前記シートを所定の位置から折り曲げる折曲手段
とを兼用することを特徴とする。[Means for Solving the Problems]
Representative means applied to the embodiments described below
Are the first and third parts for conveying the sheet in a substantially horizontal direction.
Conveying means and sheets conveyed by the first conveying means
Forward / reverse drive for transporting paper in a substantially vertical direction
Surrounded by the transport means and the first, second, and third transport means
Switching means for switching the sheet conveying path in the area,
The sheet conveying path length between the first and third conveying means is L1,Previous
The sheet conveying path length between the first and second conveying means is L2, The above
The sheet conveyance path length between the second and third conveyance means is L3, Sheet
Length is LPThen, L1, L2, L 3> LPIs / 2
The switching means is a timing for switching the sheet conveying path.
Inverting hands that change the front and back of the seat by changing the
Steps and bending means for bending the sheet from a predetermined position
It is characterized by using both.

【０００６】[0006]

【作用】前記手段によれば、シートを反転搬送する場
合、第１搬送手段により搬送されたシートを、切換手段
により第２搬送手段に導き、該第２搬送手段を正転駆動
させてシートを所定量搬送する。次に前記切換手段によ
りシート搬送路を切り換えて前記第２搬送手段を逆転駆
動してシートは表裏反転されて第３搬送手段へ搬送され
る。According to the above means, when the sheet is reversed and conveyed, the sheet conveyed by the first conveying means is guided to the second conveying means by the switching means, and the second conveying means is driven to rotate in the normal direction. Carry a predetermined amount. Next, the switching means switches the sheet transport path to reversely drive the second transport means to reverse the sheet and transport the sheet to the third transport means.

【０００７】また前記シートを折り曲げ搬送する場合、
第１搬送手段により搬送されたシートを切換手段により
第２搬送手段に導き、前記第２搬送手段を正転駆動させ
てシートが前記切換手段を通過中に所定のタイミングで
該切換手段を移動させてシート搬送路を切り換える。こ
のとき前記シートは前記切換手段により所定位置より折
り目が付けられ、同時に前記第２搬送手段を逆転駆動す
ることによりシートは折り目側より搬送され、第３搬送
手段を通過するとき完全に折り曲げられた状態で下流側
へ搬送される。When the sheet is folded and conveyed,
The sheet conveyed by the first conveying means is guided to the second conveying means by the switching means, and the second conveying means is normally driven to move the switching means at a predetermined timing while the sheet is passing through the switching means. Switch the sheet transport path. At this time, the sheet is folded from a predetermined position by the switching means, and at the same time, the sheet is conveyed from the fold side by driving the second conveying means in the reverse direction, and is completely folded when passing through the third conveying means. In that state, it is transported to the downstream side.

【０００８】[0008]

【実施例】【Example】

【０００９】以下、前記手段を適用した本発明に係る画
像形成装置の一実施例について図面を参照して説明す
る。尚、本実施例は画像形成装置として両面記録可能な
カラー複写機を用いた実施例について説明する。図１は
シートを折り曲げ搬送する過程を示す説明図、図２は折
り曲げたシートの説明図、図３はシートを反転搬送する
過程を示す説明図、図４は複写機の概略構成を示す説明
図である。An embodiment of the image forming apparatus according to the present invention to which the above means is applied will be described below with reference to the drawings. In this embodiment, a double-sided recording color copying machine is used as an image forming apparatus. 1 is an explanatory diagram showing a process of folding and conveying a sheet, FIG. 2 is an explanatory diagram of a folded sheet, FIG. 3 is an explanatory diagram showing a process of reversing and conveying a sheet, and FIG. 4 is an explanatory diagram showing a schematic configuration of a copying machine. Is.

【００１０】先ず図４を参照して複写機の概略構成につ
いて説明する。複写機は画像形成手段として装置上部に
デジタル画像リーダ部、装置下部にデジタル画像プリン
タ部を有する。上記デジタル画像リーダ部において、原
稿１は原稿台ガラス２上に載せ、露光ランプ３により露
光走査することにより、上記原稿１からの反射光像４を
ミラー５ａ，５ｂ，５ｃ、更にはレンズ６を介してＣＣ
Ｄ等の画像読取素子７に集光し、画像信号を得る。この
画像信号は、図示しない増幅回路を経て、図示しないビ
デオ処理ユニットにて処理を施され、デジタル画像プリ
ンタ部に転送される。First, the schematic construction of the copying machine will be described with reference to FIG. The copying machine has a digital image reader section at the upper part of the apparatus and a digital image printer section at the lower part of the apparatus as image forming means. In the digital image reader section, the original 1 is placed on the original glass 2 and exposed and scanned by the exposure lamp 3, so that the reflected light image 4 from the original 1 is reflected by the mirrors 5a, 5b, 5c and the lens 6. Through CC
An image signal is obtained by focusing on the image reading element 7 such as D. This image signal is processed by a video processing unit (not shown) through an amplifier circuit (not shown) and transferred to the digital image printer section.

【００１１】上記デジタル画像プリンタ部において、像
担持体である感光ドラム８は回転自在に保持されてお
り、該感光ドラム８の周囲に前露光ランプ９、一次帯電
器10、レーザー露光光学系11、現像器12、転写帯電器1
3、クリーニング器14が配置されている。In the digital image printer section, the photosensitive drum 8 as an image carrier is rotatably held, and a pre-exposure lamp 9, a primary charger 10, a laser exposure optical system 11 are provided around the photosensitive drum 8. Developer 12, Transfer charger 1
3, cleaning device 14 is arranged.

【００１２】上記レーザー露光光学系11において、前記
デジタル画像リーダ部からの画像信号は、レーザー出力
部にて光信号に変換され、該変換されたレーザー光がポ
リゴンミラー11ａで反射され、ミラー11ｂ，11ｃを経て
感光ドラム８の周面に投影される。画像形成時には、前
記感光ドラム８を矢印方向に回転させ、前露光ランプ９
で除電した後の該感光ドラム８を一次帯電器10により一
様に帯電させて、原稿面からの光像４を照射して静電潜
像を形成する。次に現像器12により上記感光ドラム８上
の潜像を現像し、該感光ドラム８上に樹脂を基体とした
トナー像を形成する。In the laser exposure optical system 11, the image signal from the digital image reader unit is converted into an optical signal by the laser output unit, the converted laser light is reflected by the polygon mirror 11a, and the mirror 11b, It is projected onto the peripheral surface of the photosensitive drum 8 via 11c. At the time of image formation, the photosensitive drum 8 is rotated in the direction of the arrow so that the pre-exposure lamp 9
The photosensitive drum 8 after the charge is removed by (1) is uniformly charged by the primary charger 10 and the optical image 4 from the original surface is irradiated to form an electrostatic latent image. Next, the latent image on the photosensitive drum 8 is developed by the developing device 12 to form a toner image on the photosensitive drum 8 using resin as a base.

【００１３】また、シートカセット16，17，18，19より
ピックアップローラ20，21，22，23により送り出された
シートＰは、リタードローラ対24，25，26，27により１
枚ずつ分離搬送されて矢印Ｑ方向へ搬送され、停止して
いるレジストローラ対28へ搬送され斜行が補正される。
また、マルチトレイ15より送り込まれたシートＰも、同
様に停止しているレジストローラ対28へ搬送され斜行が
補正される。上記シートＰはレジストローラ対28を駆動
して所定のタイミングで転写帯電器13と感光ドラム８と
の間に搬送され、該転写帯電器13により前記トナー像と
逆極性の電圧を印加され、上記感光ドラム８上のトナー
画像はシートＰに転写される。画像転写後にドラム面に
残留するトナーはクリーニング器14により除去され、次
の画像形成に備える。Further, the sheet P sent out from the sheet cassettes 16, 17, 18, 19 by the pickup rollers 20, 21, 22, 23 is transferred by the retard roller pair 24, 25, 26, 27 to 1
The sheets are separated and conveyed one by one, conveyed in the direction of arrow Q, and conveyed to the pair of registration rollers 28 that are stopped, and skew is corrected.
Further, the sheet P fed from the multi-tray 15 is also conveyed to the pair of registration rollers 28 that are also stopped, and the skew is corrected. The sheet P is conveyed between the transfer charger 13 and the photosensitive drum 8 at a predetermined timing by driving the registration roller pair 28, and the transfer charger 13 applies a voltage having a polarity opposite to that of the toner image, The toner image on the photosensitive drum 8 is transferred to the sheet P. The toner remaining on the drum surface after the image transfer is removed by the cleaning device 14 to prepare for the next image formation.

【００１４】画像転写後のシートＰは除電針28ａにより
除電してドラム面より分離され、搬送装置29により定着
装置30に搬送される。上記シートＰは定着装置30を通過
する際に熱及び圧力を印加されて転写画像の定着が行な
われる。The sheet P after the image transfer is destaticized by the destaticizing needle 28a, separated from the drum surface, and conveyed by the conveying device 29 to the fixing device 30. Heat and pressure are applied to the sheet P when passing through the fixing device 30, so that the transferred image is fixed.

【００１５】画像定着後のシートＰは、シート搬送装置
39により片面のみの画像形成であれば、表裏反転させて
フェースダウンで装置外に排出され、両面画像形成を行
なう場合には反転部52へ搬送されて反転させた後、所定
のフラッパ31，32，33，34を開閉させて中間トレイ35に
画像面を上にして排出積載する。該中間トレイ35に積載
されたシートＰは、掃き寄せローラ36，ピックアップロ
ーラ37により送り出され、リタードローラ対38により矢
印Ｒ方向へ１枚ずつ分離搬送され、前述したレジストロ
ーラ対28により所定のタイミングで転写部に搬送され、
両面画像形成が行なわれた後、装置外に排出される。The sheet P after the image fixing is a sheet conveying device.
If only one side of the image is to be formed by 39, it is reversed upside down and discharged face down from the apparatus. If double sided image formation is to be performed, it is conveyed to the reversing section 52 and reversed, and then the predetermined flappers 31, 32 are placed. , 33, 34 are opened and closed to discharge and stack the image on the intermediate tray 35 with the image side facing up. The sheets P stacked on the intermediate tray 35 are sent out by a sweeping roller 36 and a pickup roller 37, separated and conveyed one by one in a direction of an arrow R by a retard roller pair 38, and a predetermined timing by the registration roller pair 28 described above. Is transported to the transfer section with
After double-sided image formation is performed, the sheet is discharged outside the apparatus.

【００１６】次に上記シート搬送装置39の構成について
図１を参照して説明する。図１（ａ）において、40ａ，
40ｂは第１搬送手段である第１搬送ローラ対であり、画
像定着後のシートＰをほぼ水平方向（矢印Ｈ方向）に搬
送する。41ａ，41ｂは第２搬送手段としての第２搬送ロ
ーラ対であり、図示しない駆動源により正逆転駆動さ
れ、シートＰをほぼ垂直方向（Ｉ方向若しくはＪ方向）
へ搬送する。42ａ，42ｂは第３搬送手段としての第３搬
送ローラ対であり、上記第１搬送ローラ対40ａ，40ｂ若
しくは第２搬送ローラ対41ａ，41ｂにより搬送されたシ
ートＰをほぼ水平方向に（矢印Ｋ方向に）装置外へ搬送
する。43，44，45はシート搬送ガイドであり、前記第
１，第２，第３搬送ローラ対40ａ，40ｂ、41ａ，41ｂ、
42ａ，42ｂ間のシート搬送パスを形成している。Next, the structure of the sheet conveying device 39 will be described with reference to FIG. In FIG. 1 (a), 40a,
40b is a first conveying roller pair which is a first conveying means, and conveys the sheet P after the image fixing in a substantially horizontal direction (direction of arrow H). 41a and 41b are a pair of second conveyance rollers as a second conveyance means, which are driven in a forward and reverse direction by a drive source (not shown) to move the sheet P in a substantially vertical direction (I direction or J direction).
Transport to. Reference numerals 42a and 42b are a third pair of conveying rollers as a third conveying means. The sheet P conveyed by the first pair of conveying rollers 40a and 40b or the second pair of conveying rollers 41a and 41b is almost horizontal (arrow K). Direction) to the outside of the device. 43, 44 and 45 are sheet conveyance guides, and the first, second and third conveyance roller pairs 40a, 40b, 41a, 41b,
A sheet conveyance path is formed between 42a and 42b.

【００１７】46，47は切換手段としてのフラッパであ
り、前記第１，第２，第３搬送ローラ対40ａ，40ｂ、41
ａ，41ｂ、42ａ，42ｂに囲まれたシート搬送パス内に配
置されている。このフラッパ46，47は、前記第１搬送ロ
ーラ対40ａ，40ｂにより搬送されたシートＰを第２搬送
ローラ対41ａ，41ｂ若しくは第３搬送ローラ対42ａ，42
ｂへシート搬送パスを切り換える。上記フラッパ46は回
転中心46ａを中心に回動し、フラッパ47は上記フラッパ
46と等間隔を保って従動する。また上記フラッパ46の一
端はソレノイド48に連結されており、該ソレノイド48を
ＯＮ／ＯＦＦ制御することにより、フラッパ46，47は回
動する。また上記フラッパ46にはフラッパ戻しバネ49が
連結されており、該フラッパ46を常時回転中心46ａを中
心に時計回り方向に付勢している。Numerals 46 and 47 are flappers as switching means, and the first, second and third conveying roller pairs 40a, 40b and 41 are provided.
It is arranged in a sheet conveying path surrounded by a, 41b, 42a and 42b. The flappers 46 and 47 transfer the sheet P transported by the first transport roller pair 40a and 40b to the second transport roller pair 41a and 41b or the third transport roller pair 42a and 42.
The sheet conveyance path is switched to b. The flapper 46 rotates about a rotation center 46a, and the flapper 47 rotates the flapper 47a.
It is driven at an equal interval with 46. Further, one end of the flapper 46 is connected to a solenoid 48, and the flapper 46, 47 is rotated by controlling ON / OFF of the solenoid 48. A flapper return spring 49 is connected to the flapper 46, and always biases the flapper 46 clockwise around the rotation center 46a.

【００１８】50はシート端を検知するシート検知センサ
であり、前記第１搬送ローラ対40ａ，40ｂよりシート搬
送方向上流側に設けられており、該シート検知センサ50
の検知信号に基づき、前記第１搬送ローラ対40ａ，40ｂ
の駆動や、第２搬送ローラ対41ａ，41ｂの正逆転駆動の
切り換えなどを行なう。Reference numeral 50 denotes a sheet detection sensor for detecting the sheet edge, which is provided on the upstream side of the first pair of conveying rollers 40a, 40b in the sheet conveying direction.
Based on the detection signal of the first conveying roller pair 40a, 40b
Drive, and switching between forward and reverse rotation drive of the second conveying roller pair 41a and 41b.

【００１９】また前記第１，第３搬送ローラ対間のシー
ト搬送路長をＬ1 、前記第１，第２搬送ローラ対間のシ
ート搬送路長をＬ2 、前記第２，第３搬送ローラ対間の
シート搬送路長をＬ3 、２つ折りする最小サイズのシー
ト長をＬP とすると、Ｌ1 ，Ｌ2 ，Ｌ3 ＞ＬP ／２の関
係にある。Further, the sheet conveying path length between the pair of first and third conveying rollers is L 1 , the sheet conveying path length between the pair of first and second conveying rollers is L 2 , and the second and third conveying rollers are Assuming that the length of the sheet conveying path between the pair is L 3 , and the length of the smallest sheet to be folded in two is L P , there is a relationship of L 1 , L 2 , L 3 > L P / 2.

【００２０】次にシートを折り曲げ搬送する過程につい
て図１を参照して説明する。図１（ａ）に示すように、
矢印Ｈ方向から搬送されたシートＰは、シート検知セン
サ50によって先端が検知されると、第１搬送ローラ対40
ａ，40ｂは図の矢印Ａ方向に回転する。この時ソレノイ
ド48はＯＮ状態にあり、フラッパ46，47は反時計回り方
向に回転した図１（ａ）に示す位置にある。シートＰ
は、上記第１搬送ローラ対40ａ，40ｂにより搬送されて
上記フラッパ46，47間を経て第２搬送ローラ対41ａ，41
ｂへ導かれる。上記第２搬送ローラ対41ａ，41ｂは駆動
停止しており、上記シート検知センサ50がシート先端を
検知してから所定時間経過後、シート先端がニップに突
き当たってループを形成して斜行を補正した後、矢印Ｂ
方向に回転する。Next, the process of folding and conveying the sheet will be described with reference to FIG. As shown in FIG.
When the leading edge of the sheet P conveyed in the direction of the arrow H is detected by the sheet detection sensor 50, the first conveyance roller pair 40
a and 40b rotate in the direction of arrow A in the figure. At this time, the solenoid 48 is in the ON state, and the flappers 46 and 47 are in the positions shown in FIG. 1A rotated counterclockwise. Sheet P
Is conveyed by the first conveying roller pair 40a, 40b, passes through the flapper 46, 47, and passes through the second conveying roller pair 41a, 41.
Guided to b. The second conveyance roller pair 41a, 41b is not driven, and after a predetermined time has elapsed since the sheet detection sensor 50 detected the sheet front end, the sheet front end hits the nip and forms a loop to correct skew. After doing, arrow B
Rotate in the direction.

【００２１】上記第２搬送ローラ対41ａ，41ｂは、図１
（ｂ）に示すように、シートＰを矢印Ｉ方向に搬送す
る。そして、上記シート検知センサ50がシート先端を検
知してからの搬送量を図示しないクロック等でカウント
しながらシートＰの折り目位置（例えばシートＰの半分
ならＬP ／２の位置）がフラッパ47の折り曲げ端47ａを
通過するとき、前記ソレノイド48をＯＦＦ状態にし、図
１（ｃ）に示すようにフラッパ46，47をフラッパ戻しバ
ネ49により回転中心46ａを中心に時計回り方向へ回転さ
せる。またこの時上記第２搬送ローラ対41ａ，41ｂを逆
転させて矢印Ｃ方向へ回転させ、シートＰを第３搬送ロ
ーラ対42ａ，42ｂへ向かって矢印Ｊ方向に搬送する。こ
の時シートＰはフラッパ47の折り曲げ端47ａによって２
つ折りに折り目が付けられた状態で搬送される。The second pair of conveying rollers 41a and 41b are shown in FIG.
As shown in (b), the sheet P is conveyed in the arrow I direction. Then, the fold position of the sheet P (for example, the position of L P / 2 for half the sheet P) of the sheet P is detected by the flapper 47 while counting the conveyance amount after the sheet detection sensor 50 detects the sheet front end with a clock (not shown) or the like. When passing through the bent end 47a, the solenoid 48 is turned off, and the flappers 46 and 47 are rotated clockwise about the rotation center 46a by the flapper return spring 49 as shown in FIG. 1C. At this time, the second pair of conveying rollers 41a and 41b are reversed and rotated in the direction of arrow C, and the sheet P is conveyed toward the third pair of conveying rollers 42a and 42b in the direction of arrow J. At this time, the sheet P is moved by the flap end 47a of the flapper 47 into 2
It is transported with the folds in the tri-fold.

【００２２】そして、図１（ｄ）に示すように、シート
Ｐは折り目側より矢印Ｄ方向に回転する第３搬送ローラ
対42ａ，42ｂによって挟持され、完全に折り曲げられた
状態で搬送される。上記シートＰはこの２つ折りの状態
で図１（ｅ）に示すように第３搬送ローラ対42ａ，42ｂ
によって矢印Ｋ方向に搬送され装置外へ排出される。Then, as shown in FIG. 1 (d), the sheet P is nipped by the third pair of conveying rollers 42a and 42b rotating in the direction of arrow D from the fold side, and is conveyed in a completely folded state. As shown in FIG. 1E, the sheet P is folded in half and the third conveying roller pair 42a, 42b is formed.
Is conveyed in the direction of arrow K and discharged to the outside of the apparatus.

【００２３】図２にシートＰを折り曲げた状態を示す。
図２（ａ）は、シートＰ１が画像面が表紙になるように
折り曲げられており、図２（ｂ）は画像面が内側になる
ように折り曲げられている。図２（ｂ）はＦＡＸなど宛
先がシート先端付近にあり、かつ記載内容が機密性のあ
る文章等の場合は、宛先だけを表面に出し（この時シー
トＰをΔＬだけずらせて折り曲げる）、残りは折り曲げ
の内側に入れて、ステープラ等を施すことが可能とな
り、装置の多機能化を図ると共に記載内容の機密性保持
に応用することができる。FIG. 2 shows a state in which the sheet P is folded.
In FIG. 2A, the sheet P1 is folded so that the image surface becomes a cover, and in FIG. 2B, the image surface is folded inside. In FIG. 2B, when the destination is near the leading edge of the sheet such as a FAX and the content of the description is confidential, only the destination is exposed on the surface (at this time, the sheet P is shifted by ΔL and bent) and the rest is left. Can be put inside the fold, and a stapler or the like can be applied, so that the device can be made multifunctional and can be applied to keep confidentiality of the described contents.

【００２４】上記図２（ａ）と（ｂ）とでは、画像形成
後のシートＰの表裏を逆にして搬送する必要があり、以
下このプロセスについて図４を参照して説明する。画像
形成後のシートＰは図４に示す排紙縦パス51に導かれ、
反転部52において、矢印Ｍ→Ｎ→Ｏの順に反転搬送され
て中間トレイ35上に画像面を上側にして排出積載され
る。その後シートＰは再給紙されて、再度画像形成部に
導かれ、画像形成されないか、又は『重要』，『機密』
等の スタンプを画像転写された後、その転写画像を定
着され、図１（ａ）に示す矢印Ｈ方向から第１搬送ロー
ラ対40ａ，40ｂに搬送され、前述した折り曲げプロセス
を経て排出され、図２（ｂ）のように折り曲げた状態と
なる。2A and 2B, it is necessary to reverse the front and back of the sheet P after the image formation, and this process will be described below with reference to FIG. The sheet P after the image formation is guided to the paper discharge vertical path 51 shown in FIG.
In the reversing unit 52, the sheets are reversed and conveyed in the order of arrows M → N → O and discharged and stacked on the intermediate tray 35 with the image surface facing upward. After that, the sheet P is re-fed and guided to the image forming unit again and is not image-formed, or "important" or "confidential".
After the image of the stamp is transferred, the transferred image is fixed, conveyed from the direction of arrow H shown in FIG. 1 (a) to the first conveying roller pair 40a, 40b, and discharged through the bending process described above. It is in a bent state as shown in FIG.

【００２５】次に上記シート搬送装置39の反転排出（フ
ェースダウン）動作について図３を参照して説明する。
図３（ａ）に示すように、画像定着後のシートＰは、矢
印Ｈ方向から搬送され、シート検知センサ50によって先
端が検知されると、第１搬送ローラ対40ａ，40ｂは図の
矢印Ａ方向に回転する。この時ソレノイド48はＯＮ状態
にあり、フラッパ46，47は反時計回り方向に回転した図
３（ａ）に示す位置にある。シートＰは、第１搬送ロー
ラ対40ａ，40ｂにより搬送されフラッパ46，47間を経て
第２搬送ローラ対41ａ，41ｂへ導かれる。次いで上記シ
ートＰは矢印Ｂ方向へ回転する第２搬送ローラ対41ａ，
41ｂにより矢印Ｉ方向へ搬送され、上記シート検知セン
サ50がシート後端を検知してから所定時間経過後、即ち
シート後端がフラッパ47の折り曲げ端47ａを通過したと
き、上記第２搬送ローラ対41ａ，41ｂを図３（ｂ）に示
すように矢印Ｃ方向へ逆転駆動し、シートＰは矢印Ｊ方
向へ搬送される。またこの時前記ソレノイド48をＯＦＦ
状態にし、フラッパ46，47をフラッパ戻しバネ49により
回転中心46ａを中心に時計回り方向へ回転させる。よっ
て、上記シートＰは上記第２搬送ローラ対41ａ，41ｂに
よりフラッパ47によりガイドされながら第３搬送ローラ
対42ａ，42ｂへ搬送される。そして、図３（ｃ）に示す
ように、シートＰは矢印Ｄ方向に回転する第３搬送ロー
ラ対42ａ，42ｂにより矢印Ｋ方向へ搬送され、装置外へ
フェースダウンで排出される。Next, the reverse discharge (face-down) operation of the sheet conveying device 39 will be described with reference to FIG.
As shown in FIG. 3A, the sheet P after the image fixing is conveyed from the direction of the arrow H, and when the leading edge is detected by the sheet detection sensor 50, the first conveying roller pair 40a, 40b moves to the arrow A in the figure. Rotate in the direction. At this time, the solenoid 48 is in the ON state, and the flappers 46, 47 are in the positions shown in FIG. 3 (a) rotated counterclockwise. The sheet P is conveyed by the first conveying roller pair 40a, 40b and is guided to the second conveying roller pair 41a, 41b via the flappers 46, 47. Next, the sheet P has a second pair of conveying rollers 41a that rotate in the direction of arrow B,
When the sheet is conveyed in the direction of arrow I by 41b, and a predetermined time has elapsed after the sheet detection sensor 50 detected the sheet trailing edge, that is, when the sheet trailing edge passes through the folded edge 47a of the flapper 47, the second transport roller pair. The sheets 41a and 41b are reversely driven in the direction of arrow C as shown in FIG. 3B, and the sheet P is conveyed in the direction of arrow J. At this time, the solenoid 48 is turned off.
Then, the flappers 46 and 47 are rotated clockwise about the rotation center 46a by the flapper return spring 49. Therefore, the sheet P is conveyed to the third conveying roller pair 42a, 42b while being guided by the flapper 47 by the second conveying roller pair 41a, 41b. Then, as shown in FIG. 3C, the sheet P is conveyed in the direction of arrow K by the third pair of conveying rollers 42a and 42b rotating in the direction of arrow D and discharged facedown from the apparatus.

【００２６】上記構成によれば、シート搬送装置39に装
備したフラッパ46，47は、シート搬送パスの切り換えの
タイミングを変えることで、シートＰの表裏を入れ替え
る反転手段と、前記シートＰを所定の位置から折り曲げ
る折曲手段とを兼用することで、複写機にフェースダウ
ン搬送機能の他に、機密保持機能を付加することがで
き、ユニットの多機能化を実現できる。According to the above construction, the flappers 46 and 47 mounted on the sheet conveying device 39 change the timing of switching the sheet conveying path to reverse the front and back of the sheet P and the sheet P to a predetermined position. By also functioning as a folding unit that bends from a position, a security function can be added to the copying machine in addition to the face-down conveyance function, and the multifunctionalization of the unit can be realized.

【００２７】尚、本実施例は、画像形成装置として複写
機を用いて説明したが、これに限定されるものではな
く、他の装置、例えばファクシミリ装置、レーザービー
ムプリンタ、或いは複写機，ファクシミリ，プリンター
等の複合機等であっても良い。Although the present embodiment has been described by using the copying machine as the image forming apparatus, the present invention is not limited to this, and other devices such as a facsimile machine, a laser beam printer, a copying machine, a facsimile machine, It may be a multifunction peripheral such as a printer.

【００２８】[0028]

【発明の効果】本発明は前述したように、シート搬送装
置に装備した切換手段は、シート搬送路の切り換えのタ
イミングを変えることで、シートの表裏を入れ替える反
転手段と、前記シートを所定の位置から折り曲げる折曲
手段とを兼用することで、前記シート搬送装置を装備し
た画像形成装置にフェースダウン搬送機能の他に、機密
保持機能を付加することができ、ユニットの多機能化を
実現できる。As described above, according to the present invention, the switching means provided in the sheet conveying apparatus includes the reversing means for switching the front and back of the sheet by changing the timing of switching the sheet conveying path, and the sheet at a predetermined position. By also functioning as a folding unit that bends the sheet, the image forming apparatus equipped with the sheet conveying device can be provided with a confidentiality keeping function in addition to the face-down conveying function, and a multi-functional unit can be realized.

【図面の簡単な説明】[Brief description of drawings]

【図１】シートを折り曲げ搬送する過程を示す説明図で
ある。FIG. 1 is an explanatory diagram showing a process of folding and conveying a sheet.

【図２】折り曲げたシートの説明図である。FIG. 2 is an explanatory diagram of a folded sheet.

【図３】シートを反転搬送する過程を示す説明図であ
る。FIG. 3 is an explanatory diagram showing a process of reversing and conveying a sheet.

【図４】複写機の概略構成を示す説明図である。FIG. 4 is an explanatory diagram showing a schematic configuration of a copying machine.

【符号の説明】[Explanation of symbols]

Ｐ…シート １…原稿 ２…原稿台ガラス ３…露光ランプ ４…反射光像 ５ａ，５ｂ，５ｃ，11ｂ，11ｃ…ミラー ６…レンズ ７…画像読取素子 ８…感光ドラム ９…前露光ランプ 10…一次帯電器 11…レーザー露光光学系 11ａ…ポリゴンミラー 12…現像器 13…転写帯電器 14…クリーニング器 15…マルチトレイ 16，17，18，19…シートカセット 20，21，22，23，37…ピックアップローラ 24，25，26，27，38…リタードローラ対 28…レジストローラ対 28ａ…除電針 29…搬送装置 30…定着装置 31，32，33，34，46，47…フラッパ 35…中間トレイ 36…掃き寄せローラ 39…シート搬送装置 40ａ，40ｂ…第１搬送ローラ対 41ａ，41ｂ…第２搬送ローラ対 42ａ，42ａ…第３搬送ローラ対 43，44，45…シート搬送ガイド 46ａ…回転中心 47ａ…折り曲げ端 48…ソレノイド 49…フラッパ戻しバネ 50…シート検知センサ 51…排紙縦パス 52…反転部 P ... Sheet 1 ... Original 2 ... Original platen glass 3 ... Exposure lamp 4 ... Reflected light image 5a, 5b, 5c, 11b, 11c ... Mirror 6 ... Lens 7 ... Image reading element 8 ... Photosensitive drum 9 ... Pre-exposure lamp 10 ... Primary charging device 11 ... Laser exposure optical system 11a ... Polygon mirror 12 ... Developing device 13 ... Transfer charging device 14 ... Cleaning device 15 ... Multi-tray 16, 17, 18, 19 ... Sheet cassette 20, 21, 22, 23, 37 ... Pickup rollers 24, 25, 26, 27, 38 ... Retard roller pair 28 ... Registration roller pair 28a ... Static elimination needle 29 ... Conveying device 30 ... Fixing device 31, 32, 33, 34, 46, 47 ... Flapper 35 ... Intermediate tray 36 ... Sweeping roller 39 ... Sheet transport devices 40a, 40b ... First transport roller pair 41a, 41b ... Second transport roller pair 42a, 42a ... Third transport roller pair 43, 44, 45 ... Sheet transport guide 46a ... Rotation center 47a … Bend end 48… Solenoid 49… Flapper Return spring 50 ... Sheet detection sensor 51 ... Paper ejection vertical path 52 ... Reversing section

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 シートをほぼ水平方向に搬送するための
第１，第３搬送手段と、 前記第１搬送手段により搬送されたシートをほぼ垂直方
向に搬送するための正逆転駆動される第２搬送手段と、 前記第１，第２，第３搬送手段に囲まれた領域でシート
搬送路を切り換える切換手段と、を備え、 前記第１，第３搬送手段間のシート搬送路長をＬ1 、前
記第１，第２搬送手段間のシート搬送路長をＬ2 、前記
第２，第３搬送手段間のシート搬送路長をＬ3、シート
長をＬP とすると、Ｌ1 ，Ｌ2 ，Ｌ3 ＞ＬP ／２であ
り、 前記切換手段は、シート搬送路の切り換えのタイミング
を変えることで、シートの表裏を入れ替える反転手段
と、前記シートを所定の位置から折り曲げる折曲手段と
を兼用することを特徴とするシート搬送装置。1. A first and a third conveying means for conveying a sheet in a substantially horizontal direction, and a second forward / reverse driving for conveying a sheet conveyed by the first conveying means in a substantially vertical direction. A sheet conveying path for switching the sheet conveying path in a region surrounded by the first, second and third conveying means, and a sheet conveying path length between the first and third conveying means is L 1 the first, a sheet conveying path length between the second conveying unit L 2, the second, the sheet conveying path length between the third conveying means L 3, when the sheet length is L P, L 1, L 2 , L 3 > L P / 2, and the switching means includes a reversing means for switching the front and back of the sheet by changing the switching timing of the sheet conveying path, and a folding means for folding the sheet from a predetermined position. A sheet conveying device which is also used. 【請求項２】 前記切換手段は、シート搬送路に設けた
シート検知手段の検知信号に基づき、ソレノイドにより
シート搬送路を切り換え制御されることを特徴とする請
求項１記載のシート搬送装置。2. The sheet conveying apparatus according to claim 1, wherein the switching means is controlled to switch the sheet conveying path by a solenoid based on a detection signal of a sheet detecting means provided in the sheet conveying path. 【請求項３】 画像情報に応じてシートに像を形成する
ための画像形成手段と、 画像形成後のシートを搬送するための請求項１記載のシ
ート搬送装置と、 を備えたことを特徴とする画像形成装置。3. An image forming means for forming an image on a sheet according to image information, and the sheet conveying device according to claim 1 for conveying the sheet after the image formation. Image forming apparatus.
JP09972594A 1994-05-13 1994-05-13 Sheet conveying device and image forming device Expired - Fee Related JP3257899B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP09972594A JP3257899B2 (en) 1994-05-13 1994-05-13 Sheet conveying device and image forming device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP09972594A JP3257899B2 (en) 1994-05-13 1994-05-13 Sheet conveying device and image forming device

Publications (2)

Publication Number Publication Date
JPH07309525A true JPH07309525A (en) 1995-11-28
JP3257899B2 JP3257899B2 (en) 2002-02-18

Family

ID=14255055

Family Applications (1)

Application Number Title Priority Date Filing Date
JP09972594A Expired - Fee Related JP3257899B2 (en) 1994-05-13 1994-05-13 Sheet conveying device and image forming device

Country Status (1)

Country Link
JP (1) JP3257899B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2810905A1 (en) * 2013-06-07 2014-12-10 Ricoh Company Ltd. Sheet processing apparatus, image forming system, and sheet conveying method
US20170205751A1 (en) * 2016-01-19 2017-07-20 Konica Minolta, Inc. Post-Processing Device Which Can Fold a Sheet
US10106364B2 (en) 2014-09-03 2018-10-23 Ricoh Company, Limited Sheet processing apparatus and image forming system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2810905A1 (en) * 2013-06-07 2014-12-10 Ricoh Company Ltd. Sheet processing apparatus, image forming system, and sheet conveying method
CN104229543A (en) * 2013-06-07 2014-12-24 株式会社理光 Sheet processing apparatus, image forming system, and sheet conveying method
US9334140B2 (en) 2013-06-07 2016-05-10 Ricoh Company, Ltd. Sheet processing apparatus, image forming system, and sheet conveying method
US10106364B2 (en) 2014-09-03 2018-10-23 Ricoh Company, Limited Sheet processing apparatus and image forming system
US20170205751A1 (en) * 2016-01-19 2017-07-20 Konica Minolta, Inc. Post-Processing Device Which Can Fold a Sheet

Also Published As

Publication number Publication date
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