JP2003327342A - Image forming device - Google Patents

Image forming device

Info

Publication number
JP2003327342A
JP2003327342A JP2002138353A JP2002138353A JP2003327342A JP 2003327342 A JP2003327342 A JP 2003327342A JP 2002138353 A JP2002138353 A JP 2002138353A JP 2002138353 A JP2002138353 A JP 2002138353A JP 2003327342 A JP2003327342 A JP 2003327342A
Authority
JP
Japan
Prior art keywords
belt
conveying
auxiliary
nip
image forming
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
Application number
JP2002138353A
Other languages
Japanese (ja)
Inventor
Takahiko Gochi
孝彦 後地
Takenori Suenaga
武徳 末永
Original Assignee
Konica Minolta Holdings Inc
コニカミノルタホールディングス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Konica Minolta Holdings Inc, コニカミノルタホールディングス株式会社 filed Critical Konica Minolta Holdings Inc
Priority to JP2002138353A priority Critical patent/JP2003327342A/en
Publication of JP2003327342A publication Critical patent/JP2003327342A/en
Pending legal-status Critical Current

Links

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming device capable of precluding a jam likely with a small-sized, curled transcription paper such as a postcard by transporting it certainly and going over the place. <P>SOLUTION: The image forming device is equipped with a belt transporting means 57 provided between a sendout side nip part N1 for a transcription paper P and a receipt side nip part N2 in such a positioning as below the plane tying the two nip parts, wherein the belt transporting means 57 is furnished with an aid transporting means 80 protruding up from the paper feeding surface a of the belt transporting means. The aid transporting means 80 can make a transfer between the service position protruding from the paper feeding surface as shown in Fig. 1 and the retreat position on a level with or below the paper feeding surface (a) as shown in Fig. 3. <P>COPYRIGHT: (C)2004,JPO

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明が属する技術分野】本発明は、画像形成装置に関
し、特に転写紙を定着器に向けて搬送する搬送手段を備
えた複写機やプリンタ等の画像形成装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus, and more particularly to an image forming apparatus such as a copying machine or a printer provided with a conveying means for conveying a transfer sheet toward a fixing device.

【0002】[0002]

【従来の技術】図4は画像形成装置としての複写機の従
来例を示す図である。原稿の自動給送が可能なADF1
0の原稿載置部11には、表面を上にした状態の原稿を
複数枚載置している。ローラ12a、ローラ12bによ
り繰り出された原稿の1枚目はローラ13によりプラテ
ンガラス14上に送り込まれる。
2. Description of the Related Art FIG. 4 is a diagram showing a conventional example of a copying machine as an image forming apparatus. ADF1 that can automatically feed documents
A plurality of originals with the front side facing up are placed on the original placing portion 11 of 0. The first document sheet fed by the rollers 12a and 12b is fed onto the platen glass 14 by the roller 13.

【0003】原稿がローラ13によってプラテンガラス
14上を通過しているとき、光源23により原稿面が照
射され、その反射光がミラー24,25,26を経て結
像光学系27を介して光電変換手段であるCCD28の
受光面に像を結ぶ。ここで、光源23、ミラー24,2
5,26、結像光学系27及びCCD28、並びに、図
示されていない光学系駆動手段とで画像読取部20を構
成している。読み取られた原稿の画像データは、CCD
28から図示しない画像メモリ手段に送られ、記憶され
る。
While the original document is passing over the platen glass 14 by the roller 13, the light source 23 illuminates the original document surface, and the reflected light is photoelectrically converted through the mirrors 24, 25 and 26 and the imaging optical system 27. An image is formed on the light receiving surface of the CCD 28 which is the means. Here, the light source 23, the mirrors 24, 2
5, 26, the image forming optical system 27, the CCD 28, and an optical system driving unit (not shown) form an image reading unit 20. The image data of the read original is CCD
It is sent from 28 to an image memory means (not shown) and stored.

【0004】このようにして、画像が読み取られた原稿
は、表面を下に向けた状態で排紙皿15上に送り出され
ていく。一方、転写紙Pが積載されているトレイ30
(30a,30b,30c)から給紙ローラにより転写
紙Pが送り出され、画像形成部50に給送される。画像
形成部50に給送される転写紙Pはその入口のレジスト
ローラで同期がとられた後、感光体ドラム51に近接す
る。
In this way, the document from which the image has been read is sent out onto the sheet discharge tray 15 with the front side facing down. On the other hand, the tray 30 on which the transfer sheets P are stacked
The transfer paper P is sent out from (30a, 30b, 30c) by the paper feed roller and is sent to the image forming unit 50. The transfer paper P fed to the image forming unit 50 is brought close to the photoconductor drum 51 after being synchronized with the registration roller at its entrance.

【0005】画像メモリ手段に記憶されている画像デー
タは、画像書込部40に入力され、画像書込部40内の
レーザダイオードから画像データに応じたレーザ光を感
光体ドラム51上に照射し、静電潜像を形成する。この
静電潜像を現像部53で現像することで、感光体ドラム
51上にトナー像を形成する。
The image data stored in the image memory means is input to the image writing section 40, and the laser diode in the image writing section 40 irradiates the photosensitive drum 51 with laser light corresponding to the image data. , Form an electrostatic latent image. By developing this electrostatic latent image by the developing unit 53, a toner image is formed on the photosensitive drum 51.

【0006】このトナー像は感光体ドラム51の下部の
転写部54により転写紙Pに転写される。そして、感光
体ドラム51に圧着されている転写紙Pは分離部55に
より分離される。感光体ドラム51から分離された転写
紙Pはベルト搬送手段57を介して定着装置58に入
り、トナー像が熱と圧力とにより定着される。このよう
に画像形成が完了した転写紙Pは、排出ローラ65によ
り排紙トレイ70上に排出される。
This toner image is transferred onto the transfer paper P by the transfer section 54 below the photosensitive drum 51. Then, the transfer paper P pressed onto the photoconductor drum 51 is separated by the separation unit 55. The transfer paper P separated from the photosensitive drum 51 enters the fixing device 58 via the belt conveying means 57, and the toner image is fixed by heat and pressure. The transfer paper P on which the image formation is completed in this way is discharged onto the paper discharge tray 70 by the discharge roller 65.

【0007】図5は、ベルト搬送手段57とその周辺を
示す側面図で、従来の画像形成装置における感光体ドラ
ム51から定着装置58までの間の構成を示している。
また、図6はベルト搬送手段57の部分を縮小した平面
図である。複写機やプリンタ等の画像形成装置は、感光
体ドラム51上のトナー画像を転写部54で複写紙P上
に転写し、分離部55で分離する。トナー画像が転写さ
れた転写紙Pは定着装置58に送り込まれ、加熱ローラ
591と加圧ローラ592とからなる定着ローラ59で
トナーを加熱溶融させて定着させている。そして、転写
部54から定着装置58までは、通常、ベルト搬送手段
57を用いて搬送している。
FIG. 5 is a side view showing the belt conveying means 57 and its periphery, and shows the structure between the photosensitive drum 51 and the fixing device 58 in the conventional image forming apparatus.
Further, FIG. 6 is a plan view in which a portion of the belt conveying means 57 is reduced. In an image forming apparatus such as a copying machine or a printer, the toner image on the photosensitive drum 51 is transferred onto the copy paper P by the transfer section 54 and separated by the separation section 55. The transfer paper P on which the toner image is transferred is sent to the fixing device 58, and the fixing roller 59 including the heating roller 591 and the pressure roller 592 heats and melts the toner to fix the toner. Then, the transfer section 54 to the fixing device 58 is usually conveyed by using the belt conveying means 57.

【0008】ベルト搬送手段57は、図6に示すよう
に、駆動軸571に固定された駆動コロ572と従動軸
573に固定された従動コロ574の間に無端状の搬送
ベルト575を巻装して構成されている。符号576は
搬送ガイド、577は搬送ダクトを示す。
As shown in FIG. 6, the belt transfer means 57 has an endless transfer belt 575 wound around a drive roller 572 fixed to a drive shaft 571 and a driven roller 574 fixed to a driven shaft 573. Is configured. Reference numeral 576 indicates a conveyance guide, and 577 indicates a conveyance duct.

【0009】搬送ベルト575には多数の貫通孔があ
り、搬送ダクト577に接続された吸引ファン(図示せ
ず)を駆動してベルト搬送手段57内を吸引しつつ、上
記駆動コロ572を図5の矢印方向に回転駆動すると、
搬送ベルト575が回転駆動され、分離部55の作用に
よって感光体ドラム51から分離された転写紙Pは搬送
ベルト575に吸着されて定着装置58に搬送される。
The transport belt 575 has a large number of through holes, and while driving the suction fan (not shown) connected to the transport duct 577 to suck the inside of the belt transport means 57, the drive roller 572 can be moved to the position shown in FIG. When driven to rotate in the direction of arrow,
The transfer belt 575 is rotationally driven, and the transfer sheet P separated from the photoconductor drum 51 by the action of the separation unit 55 is adsorbed by the transfer belt 575 and is transferred to the fixing device 58.

【0010】[0010]

【発明が解決しようとする課題】ところで、画像形成装
置を小型化すると、ベルト搬送手段57も小型になり、
搬送ベルト575も短くなるので吸引力も低下する。一
方、葉書などの小サイズの転写紙では、感光体ドラム5
1と分離部55とのニップ部N1から定着ローラ59の
ニップ部N2までの距離より転写紙Pの搬送方向の長さ
が小さくなる。すると、搬送の途中で、図5に示すよう
に、転写紙Pが両側のニップ部N1,N2のいずれにも
把持されない状態が生じる。特に、転写紙が葉書のよう
に通常の転写紙より厚いと、上方に向けて凸状にカール
することがあり、搬送ベルト575の吸着力が弱いため
に転写紙Pは搬送ベルト575に吸着されないまま搬送
される。そして、転写紙Pの先端が定着装置58の入口
ガイド581に達し、まだ定着ローラ59のニップ部N
2に達しないうちに、転写紙Pの後端が感光体ドラム5
1と分離部55とのニップ部N1を離れてしまう。する
と、転写紙Pには搬送する力が一切加わらなくなり、定
着装置58に入る前で停止してアーチ状に橋渡しされた
状態となり、橋渡しジャムが発生してしまう。
By the way, when the image forming apparatus is downsized, the belt conveying means 57 is also downsized,
Since the conveyor belt 575 is also shortened, the suction force is also reduced. On the other hand, for small size transfer paper such as postcards, the photosensitive drum 5
The length of the transfer sheet P in the transport direction is smaller than the distance from the nip portion N1 between the 1 and the separating portion 55 to the nip portion N2 of the fixing roller 59. Then, as shown in FIG. 5, the transfer paper P is not gripped by either of the nip portions N1 and N2 on both sides during the conveyance. In particular, when the transfer paper is thicker than a normal transfer paper like a postcard, the transfer paper P may be curled upward, and the transfer belt 575 has a weak suction force. Therefore, the transfer paper P is not absorbed by the transfer belt 575. It is transported as it is. Then, the leading end of the transfer sheet P reaches the entrance guide 581 of the fixing device 58, and the nip portion N of the fixing roller 59 is still formed.
Before the number reaches 2, the rear end of the transfer paper P becomes the photosensitive drum 5
1 and the nip portion N1 between the separating portion 55 are separated from each other. Then, no transfer force is applied to the transfer sheet P, the transfer sheet P is stopped before entering the fixing device 58, and the transfer sheet P is bridged in an arch shape, which causes a bridging jam.

【0011】上記問題を解決するためには、吸引ファン
を大容量化して搬送ベルト575の吸着力を大きくする
方法が考えられるが、吸引ファンの大幅な増強が必要
で、装置の製造コストを上昇させてしまう。
In order to solve the above problem, a method of increasing the capacity of the suction fan to increase the suction force of the conveyor belt 575 can be considered, but it is necessary to significantly increase the suction fan, which increases the manufacturing cost of the apparatus. I will let you.

【0012】本発明は上記の問題の解決を図ったもの
で、カールした葉書などの小サイズの転写紙でも、これ
を確実に搬送して橋渡しジャムの発生を防ぐことができ
る画像形成装置を提供することにある。
The present invention has been made to solve the above problems, and provides an image forming apparatus capable of reliably conveying curled postcards and other small-sized transfer paper to prevent bridging jams. To do.

【0013】[0013]

【課題を解決するための手段】上記の目的を達成するた
めに本発明は、転写紙の送出側ニップ部と、受取側ニッ
プ部との間に設けられ、上記送出側ニップ部と受取側ニ
ップ部とを結ぶ面より下方に通紙面を有するベルト搬送
手段を備えた画像形成装置において、上記ベルト搬送手
段に、該ベルト搬送手段の通紙面より上方に突出する補
助搬送手段を設けたことを特徴としている。
In order to achieve the above object, the present invention is provided between a sending side nip part and a receiving side nip part of a transfer sheet, and the sending side nip part and the receiving side nip are provided. In an image forming apparatus having a belt conveying means having a sheet passing surface below a surface connecting the sheet conveying section, the belt conveying means is provided with an auxiliary conveying means projecting above the sheet passing surface of the belt conveying means. I am trying.

【0014】上記補助送手段を上記ベルト搬送手段の搬
送方向先端の中央に設けた構成としたり、上記補助搬送
手段は、上記ベルト搬送手段の通紙面より上方に突出し
ない位置に退避可能である構成としたり、上記補助搬送
手段が補助ベルトを有し、該補助ベルトが上記搬送ベル
トの駆動コロと同軸で同径の駆動ローラにより駆動され
ている構成することができる。
The auxiliary feeding means may be provided at the center of the leading end of the belt conveying means in the conveying direction, or the auxiliary conveying means may be retracted to a position where it does not project above the sheet passing surface of the belt conveying means. Alternatively, the auxiliary conveying means may include an auxiliary belt, and the auxiliary belt is driven by a driving roller having the same diameter as the driving roller of the conveying belt.

【0015】[0015]

【発明の実施の形態】以下に本発明の実施例を図面によ
って詳細に説明する。図1は、本発明の画像形成装置に
おけるベルト搬送手段の周辺の構造を示す図である。従
来例に示す図5に対応している。図2はベルト搬送手段
の平面図で、図6に対応した図である。従来例と共通す
る構成には同じ符号を付し、異なる構成を中心に説明す
る。
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing a structure around a belt conveying means in an image forming apparatus of the present invention. It corresponds to FIG. 5 showing the conventional example. FIG. 2 is a plan view of the belt conveying means and corresponds to FIG. The same components as those in the conventional example are designated by the same reference numerals, and different components will be mainly described.

【0016】本発明に用いられるベルト搬送手段は、従
来のベルト搬送手段57に補助搬送手段80を設けてい
る。この補助搬送手段80は、ベルト搬送手段57の搬
送方向先端にあって、かつ、ベルト搬送手段57の中央
に設けられている。この位置に設けることで、最小サイ
ズの転写紙でもこの補助搬送手段80に接触可能となっ
ている。
The belt conveying means used in the present invention comprises the conventional belt conveying means 57 and the auxiliary conveying means 80. The auxiliary carrying means 80 is provided at the front end of the belt carrying means 57 in the carrying direction and in the center of the belt carrying means 57. By providing it at this position, even the smallest size transfer sheet can be brought into contact with the auxiliary transporting means 80.

【0017】補助搬送手段80は、駆動コロ572と同
軸で同径の駆動ローラ81と、ベルト搬送手段57の先
端に突出した従動ローラ83と、これらの間に巻回され
たエンドレスの補助ベルト82と、これらの両側に延び
て90゜折り曲げられたブラケット84と、このブラケ
ット84に一端が回動可能に接続されるL型リンク85
と、L型リンク85の他端に接続されるピストン86と
から構成されている。駆動ローラ81は駆動コロ572
と同径なので、補助ベルト82は、搬送ベルト575の
表面速度と一致した表面速度で回転する。また、補助搬
送手段80を駆動する駆動源を別個に設ける必要がな
い。ブラケット84は、駆動軸571に回動自在に支持
され、従動ローラ83を駆動軸571の回りに公転する
ように支持している。
The auxiliary conveying means 80 includes a driving roller 81 coaxial with the driving roller 572 and having the same diameter, a driven roller 83 protruding from the tip of the belt conveying means 57, and an endless auxiliary belt 82 wound between them. And a bracket 84 extending to both sides thereof and bent at 90 °, and an L-shaped link 85 having one end rotatably connected to the bracket 84.
And a piston 86 connected to the other end of the L-shaped link 85. The drive roller 81 is a drive roller 572.
Since it has the same diameter as the auxiliary belt 82, the auxiliary belt 82 rotates at a surface speed that matches the surface speed of the conveyor belt 575. Further, it is not necessary to separately provide a drive source for driving the auxiliary transporting means 80. The bracket 84 is rotatably supported by the drive shaft 571, and supports the driven roller 83 so as to revolve around the drive shaft 571.

【0018】ただし、常時、図1に示すように上方に突
出した状態だと、通常のサイズの転写紙の場合には、却
って通紙の邪魔になる。そこで、図3に示すように補助
搬送手段80を通紙面aと同じ高さか下方に退避させら
れるようにしている。
However, when the transfer paper is of a normal size, it constantly interferes with the passing of the transfer paper if it is constantly projected upward as shown in FIG. Therefore, as shown in FIG. 3, the auxiliary conveying means 80 is retracted to the same height as the sheet surface a or downward.

【0019】すなわち、補助搬送手段80は、図1に示
す使用状態と、図3に示す退避状態の双方に移行自在で
ある。図1では、ピストン86が図の右方に下がってブ
ラケット84の先端を下方に押し下げ、これによって駆
動ローラ81が、駆動軸571を中心に回転して上昇し
補助ベルト82の先端が搬送ベルト575の通紙面aよ
り上に突出している。また、図3では、ピストン86が
図の左方に移動してブラケット84の先端を上方に押し
上げ、これによって駆動ローラ81が駆動軸571を中
心に逆方向に回転して下降し、補助ベルト82の先端が
搬送ベルト575の通紙面aと同じか低くなるようにし
ている。ピストン86としては、ソレノイドを使用する
ことができる。
That is, the auxiliary conveying means 80 can be moved to both the use state shown in FIG. 1 and the retracted state shown in FIG. In FIG. 1, the piston 86 descends to the right in the figure and pushes the tip of the bracket 84 downward, whereby the drive roller 81 rotates around the drive shaft 571 and rises, and the tip of the auxiliary belt 82 moves to the conveyor belt 575. Is projected above the sheet passing surface a. Further, in FIG. 3, the piston 86 moves to the left in the figure and pushes the tip of the bracket 84 upward, whereby the drive roller 81 rotates in the opposite direction about the drive shaft 571 and descends, and the auxiliary belt 82. The leading end of the sheet is set to be the same as or lower than the sheet passing surface a of the conveyor belt 575. A solenoid can be used as the piston 86.

【0020】図1に示す使用位置にあると、葉書等の小
サイズの転写紙Pが送られ、転写紙Pの両端がニップ部
N1,N2の双方から離れ、かつ、転写紙のカールによ
り転写紙Pが搬送ベルト575に吸着しない状態になっ
ても、補助搬送手段80の補助ベルト82が転写紙Pに
接触し、搬送を続けることができる。したがって、小サ
イズの転写紙Pも、先端が定着装置58のニップ部N2
に達するまで確実に送り込まれ、橋渡しジャムを防止す
ることができる。図1の状態と図3の状態との切替は、
ユーザが複写機の操作部で、対象となる小サイズの転写
紙(たとえば葉書)を選択すると、自動的に図1の状態
に切り替わるようにしている。あるいは、ユーザが葉書
サイズの転写紙をセットしてスタートキーを押したこと
によって、自動的に図1の状態になるようにしてもよ
い。そして、プリント動作が完了すると、図3の状態に
自動的に戻るようにしている。さらに、電源をオフにし
たり、紙づまりの場合や、機械が異常状態に移行したこ
とによっても、図3の状態になるようにしている。
At the use position shown in FIG. 1, a small size transfer paper P such as a postcard is fed, both ends of the transfer paper P are separated from both the nip portions N1 and N2, and the transfer paper P is transferred by curling. Even when the paper P is not adsorbed to the transport belt 575, the auxiliary belt 82 of the auxiliary transport unit 80 contacts the transfer paper P and the transport can be continued. Therefore, the leading edge of the small-sized transfer paper P is also the nip portion N2 of the fixing device 58.
It can be reliably fed until it reaches, and bridging jams can be prevented. Switching between the state of FIG. 1 and the state of FIG.
When the user selects a target small-sized transfer sheet (for example, a postcard) on the operation unit of the copying machine, the state is automatically switched to the state shown in FIG. Alternatively, the state shown in FIG. 1 may be automatically set by the user setting a postcard-sized transfer sheet and pressing the start key. Then, when the printing operation is completed, the state of FIG. 3 is automatically restored. Further, the state shown in FIG. 3 is set even when the power is turned off, a paper jam occurs, or the machine goes into an abnormal state.

【0021】[0021]

【発明の効果】以上に説明したように本発明によれば、
転写紙の送出側ニップ部と、受取側ニップ部との間に設
けられ、上記送出側ニップ部と受取側ニップ部とを結ぶ
面より下方に通紙面を有するベルト搬送手段を備えた画
像形成装置において、上記ベルト搬送手段に、該ベルト
搬送手段の通紙面より上方に突出する補助搬送手段を設
けたので、送出側ニップ部と受取側ニップ部間より短い
長さの転写紙の場合でも、確実に受取側のニップ部に転
写紙を送り込むことができ、橋渡しジャムを防止するこ
とができる。
As described above, according to the present invention,
An image forming apparatus provided with a belt conveying means provided between a sending side nip part of a transfer sheet and a receiving side nip part and having a sheet passing surface below a surface connecting the sending side nip part and the receiving side nip part. In the above, since the belt conveying means is provided with the auxiliary conveying means projecting above the sheet passing surface of the belt conveying means, even if the transfer paper has a length shorter than the distance between the sending side nip part and the receiving side nip part, The transfer paper can be sent to the nip portion on the receiving side, and bridging jam can be prevented.

【0022】補助送手段を上記ベルト搬送手段の搬送方
向先端の中央に設けることによって、最小サイズの転写
紙でも、受取側のニップ部に確実に送り込むことができ
るようになる。
By providing the auxiliary feeding means at the center of the leading end of the belt feeding means in the feeding direction, it becomes possible to reliably feed the transfer paper of the smallest size to the nip portion on the receiving side.

【0023】補助搬送手段が、上記ベルト搬送手段の通
紙面より上方に突出しない位置に退避可能である構成と
すれば、通常の大きさの転写紙の場合は補助搬送手段を
退避させておくことができ、通紙の邪魔になることもな
い。
If the auxiliary conveying means can be retracted to a position that does not project above the sheet passing surface of the belt conveying means, the auxiliary conveying means should be retracted in the case of a normal size transfer sheet. It does not interfere with the passage of paper.

【0024】上記補助搬送手段が補助ベルトを有し、該
補助ベルトが上記搬送ベルトの駆動コロと同軸で同径の
駆動ローラにより駆動されている構成とすれば、補助ベ
ルトを搬送ベルトと同じ駆動軸で、かつ同じ表面速度で
駆動することができ、独立した駆動手段が不要となる。
If the auxiliary conveying means has an auxiliary belt and the auxiliary belt is driven by a driving roller having the same diameter as the driving roller of the conveying belt, the auxiliary belt is driven in the same manner as the conveying belt. It can be driven axially and at the same surface speed, eliminating the need for independent drive means.

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

【図1】本発明の画像形成装置におけるベルト搬送手段
の周辺の構造を示す図である。
FIG. 1 is a diagram showing a structure around a belt conveying unit in an image forming apparatus of the present invention.

【図2】ベルト搬送手段の平面図である。FIG. 2 is a plan view of a belt conveying unit.

【図3】図1において、補助搬送手段を退避状態にした
状態を示す図である。
FIG. 3 is a diagram showing a state in which an auxiliary transport unit is in a retracted state in FIG.

【図4】画像形成装置としての複写機の従来例を示す図
である。
FIG. 4 is a diagram showing a conventional example of a copying machine as an image forming apparatus.

【図5】ベルト搬送手段とその周辺を示す側面図であ
る。
FIG. 5 is a side view showing a belt conveying unit and its periphery.

【図6】ベルト搬送手段の平面図である。FIG. 6 is a plan view of a belt conveying unit.

【符号の説明】[Explanation of symbols]

a 通紙面 P 転写紙 N1 送出側ニップ部 N2 受取側ニップ部 57 ベルト搬送手段 575 搬送ベルト 80 補助搬送手段 81 駆動ローラ 82 補助ベルト 572 駆動コロ a Paper surface P transfer paper N1 delivery side nip N2 Receiving side nip 57 belt conveying means 575 Conveyor belt 80 Auxiliary transport means 81 drive roller 82 Auxiliary belt 572 Drive roller

───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 2H033 AA14 AA47 BA08 BA12 BA59 BB00 2H072 AA01 AA16 CA03 CA05 CB00 CB08 HA02 JA02 JA03 JA04 3F049 AA01 DA03 DB02 FB00 LA01 LB03    ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2H033 AA14 AA47 BA08 BA12 BA59                       BB00                 2H072 AA01 AA16 CA03 CA05 CB00                       CB08 HA02 JA02 JA03 JA04                 3F049 AA01 DA03 DB02 FB00 LA01                       LB03

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 転写紙の送出側ニップ部と、受取側ニッ
プ部との間に設けられ、上記送出側ニップ部と受取側ニ
ップ部とを結ぶ面より下方に通紙面を有するベルト搬送
手段を備えた画像形成装置において、 上記ベルト搬送手段に、該ベルト搬送手段の通紙面より
上方に突出する補助搬送手段を設けたことを特徴とする
画像形成装置。
1. A belt conveying means provided between a sending-side nip portion and a receiving-side nip portion of a transfer sheet and having a paper passing surface below a surface connecting the sending-side nip portion and the receiving-side nip portion. An image forming apparatus provided with the image forming apparatus, wherein the belt conveying means is provided with an auxiliary conveying means projecting upward from a sheet passing surface of the belt conveying means.
【請求項2】 上記補助送手段を上記ベルト搬送手段の
搬送方向先端の中央に設けたことを特徴とする請求項1
記載の画像形成装置。
2. The auxiliary feeding means is provided at the center of the leading end of the belt feeding means in the feeding direction.
The image forming apparatus described.
【請求項3】 上記補助搬送手段は、上記ベルト搬送手
段の通紙面より上方に突出しない位置に退避可能である
ことを特徴とする請求項1又は2記載の画像形成装置。
3. The image forming apparatus according to claim 1, wherein the auxiliary transporting unit is retractable to a position where it does not project above the sheet passing surface of the belt transporting unit.
【請求項4】 上記補助搬送手段が補助ベルトを有し、
該補助ベルトが上記搬送ベルトの駆動コロと同軸で同径
の駆動ローラにより駆動されていることを特徴とする請
求項1から3のいずれかに記載の画像形成装置。
4. The auxiliary conveying means has an auxiliary belt,
4. The image forming apparatus according to claim 1, wherein the auxiliary belt is driven by a drive roller having the same diameter as the drive roller of the transport belt and having the same diameter.
JP2002138353A 2002-05-14 2002-05-14 Image forming device Pending JP2003327342A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002138353A JP2003327342A (en) 2002-05-14 2002-05-14 Image forming device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002138353A JP2003327342A (en) 2002-05-14 2002-05-14 Image forming device

Publications (1)

Publication Number Publication Date
JP2003327342A true JP2003327342A (en) 2003-11-19

Family

ID=29699815

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002138353A Pending JP2003327342A (en) 2002-05-14 2002-05-14 Image forming device

Country Status (1)

Country Link
JP (1) JP2003327342A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010085976A (en) * 2008-09-08 2010-04-15 Ricoh Co Ltd Image forming apparatus
JP2012008454A (en) * 2010-06-28 2012-01-12 Canon Inc Image forming apparatus
JP2013064957A (en) * 2011-09-20 2013-04-11 Fuji Xerox Co Ltd Image forming device
US8818212B2 (en) 2011-01-19 2014-08-26 Canon Kabushiki Kaisha Image forming apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010085976A (en) * 2008-09-08 2010-04-15 Ricoh Co Ltd Image forming apparatus
JP2012008454A (en) * 2010-06-28 2012-01-12 Canon Inc Image forming apparatus
US8818212B2 (en) 2011-01-19 2014-08-26 Canon Kabushiki Kaisha Image forming apparatus
JP2013064957A (en) * 2011-09-20 2013-04-11 Fuji Xerox Co Ltd Image forming device

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