JPH0934202A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH0934202A JPH0934202A JP7179166A JP17916695A JPH0934202A JP H0934202 A JPH0934202 A JP H0934202A JP 7179166 A JP7179166 A JP 7179166A JP 17916695 A JP17916695 A JP 17916695A JP H0934202 A JPH0934202 A JP H0934202A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- jam
- image forming
- forming apparatus
- cover member
- 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
- Electrophotography Configuration And Component (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
- Paper Feeding For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、プリンタ・ファク
シミリ・複写機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 such as a printer, a facsimile and a copying machine.
【０００２】[0002]
【従来の技術】図９に、従来例の画像形成装置（レーザ
ービームプリンタ）の全体構成を示す。2. Description of the Related Art FIG. 9 shows the overall structure of a conventional image forming apparatus (laser beam printer).
【０００３】ここでは、まず、給紙カセット２又は手差
しトレイ３から給送されるシートＳの流れに沿って本画
像形成装置の全体的な構成を説明する。First, the overall structure of the image forming apparatus will be described along the flow of the sheets S fed from the paper feed cassette 2 or the manual feed tray 3.
【０００４】給紙カセット２内に積載収納されているシ
ートＳは、図において反時計回り方向に回転する給紙ロ
ーラ４によって最上位のシートから順に繰り出される。
この場合、給紙ローラ４によって繰り出されるシートは
不図示の分離手段によって最上位のシートのみが１枚に
分離される。The sheets S stacked and stored in the sheet feeding cassette 2 are fed in order from the uppermost sheet by a sheet feeding roller 4 which rotates counterclockwise in the figure.
In this case, as for the sheet fed by the sheet feeding roller 4, only the uppermost sheet is separated into one sheet by a separating unit (not shown).
【０００５】給紙ローラ４によって繰り出されたシート
Ｓは回転停止状態のレジストローラ対５へ送られる。そ
して、シート先端がレジストローラ対５のニップに突き
当たって所定量のループを形成すると、給紙ローラ４が
回転を停止し、シートＳが移動を停止する。このループ
の形成によりシートＳの斜行状態が矯正される。The sheet S fed by the paper feed roller 4 is sent to the registration roller pair 5 in a rotation stopped state. When the leading edge of the sheet hits the nip of the registration roller pair 5 to form a predetermined amount of loop, the sheet feeding roller 4 stops rotating and the sheet S stops moving. By forming this loop, the skew state of the sheet S is corrected.
【０００６】手差しトレイ３は支軸６を中心として上下
の方向に回動可能であり、不使用時には図示のように閉
じられている。手差し給紙を行う際には、まず、閉じて
いる手差しトレイ３を開いて略水平状態にセットする。The manual feed tray 3 is rotatable in the up and down direction around the support shaft 6, and is closed as shown in the drawing when not in use. When performing manual feeding, first, the closed manual feeding tray 3 is opened and set in a substantially horizontal state.
【０００７】手差しトレイ３上から画像形成装置本体１
内へ差し込まれたシートＳは、図において時計回り方向
に回転する給紙ローラ７によって繰り出され、分離パッ
ド８によって１枚ずつ分離されて回転停止状態のレジス
トローラ対５へ送られる。そして、シート先端がレジス
トローラ対５のニップに突き当たって所定量のループを
形成すると、給紙ローラ７が回転を停止し、シートＳが
移動を停止する。From the top of the manual feed tray 3 to the image forming apparatus main body 1
The sheet S inserted therein is fed out by the paper feed roller 7 which rotates in the clockwise direction in the figure, separated one by one by the separation pad 8 and sent to the registration roller pair 5 in the rotation stopped state. When the leading edge of the sheet hits the nip of the registration roller pair 5 and forms a predetermined amount of loop, the sheet feeding roller 7 stops rotating and the sheet S stops moving.
【０００８】斜行状態が矯正されたシートＳは、図にお
いて反時計回り方向に回転している感光ドラム９上のト
ナー像とシート先端との位置を合わせるタイミングをと
って回転を開始するレジストローラ対５によって、感光
ドラム９と転写ローラ１０との間の転写部へ送られる。
給紙ローラ４又は７は、レジストローラ対５から機体内
へシートＳが送られた後、一定間隔で回転を開始し、次
のシートをレジストローラ対５へ突き当てる。The sheet S whose skewed state is corrected is rotated by a registration roller which starts rotation at a timing of aligning the position of the toner image on the photosensitive drum 9 rotating counterclockwise in the figure with the leading edge of the sheet. The pair 5 sends the image to the transfer portion between the photosensitive drum 9 and the transfer roller 10.
The sheet feeding roller 4 or 7 starts rotating at a constant interval after the sheet S is sent from the registration roller pair 5 to the inside of the machine body, and abuts the next sheet on the registration roller pair 5.
【０００９】転写部へ送られたシートＳのシート面に
は、反時計回り方向に回転している感光ドラム９上のト
ナー像が転写ローラ１０によって順次転写されて行く。On the sheet surface of the sheet S sent to the transfer portion, the toner image on the photosensitive drum 9 rotating counterclockwise is sequentially transferred by the transfer roller 10.
【００１０】反時計回り方向に回転している感光ドラム
９上には、レーザースキャナ１１から発射されたレーザ
ー光Ｌが照射され、順次情報の静電潜像が形成されて行
く。この静電潜像は不図示の現像器から供給されるトナ
ーによって顕画化（トナー像）され、転写部へ送られ
る。The photosensitive drum 9 rotating counterclockwise is irradiated with the laser beam L emitted from the laser scanner 11 to sequentially form an electrostatic latent image of information. This electrostatic latent image is visualized (toner image) by toner supplied from a developing device (not shown) and is sent to the transfer section.
【００１１】トナー像の転写を終えたシートＳは定着ロ
ーラ対１２へ送られ、同定着ローラ対１２のニップを通
過中に定着ローラ１２Ａによって加熱され、かつ、加圧
ローラ１２Ｂによって加圧されることにより、転写トナ
ー像がシート面に定着される。The sheet S on which the toner image has been transferred is sent to the fixing roller pair 12, and is heated by the fixing roller 12A and is pressed by the pressure roller 12B while passing through the nip of the identification fixing roller pair 12. As a result, the transferred toner image is fixed on the sheet surface.
【００１２】トナー像の定着処理を終えたシートＳは排
紙ローラ装置１３へ送られ、同排紙ローラ装置１３によ
って機外の排紙台１４上へ排紙される。The sheet S on which the fixing process of the toner image has been completed is sent to the paper discharge roller device 13, and is discharged by the paper discharge roller device 13 onto the paper discharge base 14 outside the machine.
【００１３】本画像形成装置の場合、定着ローラ対１２
を通過した直後のシートＳにジャムが生じ易い。このた
め、画像形成装置本体１には、図１０に示すように、定
着ローラ対１２の直下流部で生じたジャムを処理するた
めの開閉可能なジャム処理用カバー部材１５が備えられ
ている。In the case of this image forming apparatus, the fixing roller pair 12 is used.
Jam is likely to occur in the sheet S immediately after passing through the sheet. For this reason, as shown in FIG. 10, the image forming apparatus main body 1 is provided with an openable / closable jam processing cover member 15 for processing a jam generated immediately downstream of the fixing roller pair 12.
【００１４】ジャム処理用カバー部材１５はヒンジ軸１
６を中心として上下の方向に回動可能であり、かつ、レ
バーロック手段１７を有している。このジャム処理用カ
バー部材１５は、通常、図示のように閉じられており、
レバーロック手段１７でロックされている。The cover member 15 for removing jam is the hinge shaft 1.
It is rotatable in the up-down direction about 6 and has a lever lock means 17. The jam removing cover member 15 is normally closed as shown in the drawing.
It is locked by the lever lock means 17.
【００１５】ジャム処理用カバー部材１５には、シート
Ｓの搬送をガイドするシート搬送方向に向いた複数のシ
ート搬送ガイドリブ１８がシート搬送方向に対して直交
する方向に所定の間隔を置いて設置されている。A plurality of sheet conveying guide ribs 18 for guiding the conveyance of the sheet S, which are oriented in the sheet conveying direction, are installed on the jam processing cover member 15 at predetermined intervals in a direction orthogonal to the sheet conveying direction. ing.
【００１６】[0016]
【発明が解決しようとする課題】しかし、定着ローラ対
１２を通過直後のシートＳがジャムを起こした場合、ジ
ャムシートＪＳの蛇行した部分を逃がすスペースがない
ので、蛇行した部分が図１１に示すように加圧ローラ１
２Ｂに巻き付いてしまう。このように蛇行部分が加圧ロ
ーラ１２に巻き付いてしまうと、加圧ローラ１２Ｂ等の
部品に損傷を与えたり、図１２に示すようにジャム処理
用カバー部材１５を開いても加圧ローラ１２Ｂに巻き付
いているジャムシートＪＳを簡単に除去することができ
なかった。加圧ローラ１２Ｂに巻き付いているジャムシ
ートＪＳは定着ローラ対１２を分解しないと除去できな
いことも多いが、このような場合、定着ローラ対１２は
高温であるため冷却するのを待たなければジャム処理作
業を行うことができない。However, when the sheet S immediately after passing through the fixing roller pair 12 causes a jam, there is no space to escape the meandering portion of the jammed sheet JS, and therefore the meandering portion is shown in FIG. Pressure roller 1
It wraps around 2B. When the meandering portion winds around the pressure roller 12 in this manner, parts such as the pressure roller 12B are damaged, and even if the jam cover member 15 is opened as shown in FIG. The wrapped jam sheet JS could not be easily removed. The jam sheet JS wound around the pressure roller 12B can often be removed only by disassembling the fixing roller pair 12, but in such a case, the fixing roller pair 12 is at a high temperature, and therefore, the jam sheet must be cooled before the jam processing is completed. I can't work.
【００１７】そこで本発明は、上述の如き事情に鑑みて
なされたもので、ジャムシートの蛇行部分がシート搬送
手段に巻き付くことのないようにした画像形成装置を提
供することを目的とする。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an image forming apparatus in which the meandering portion of a jam sheet is prevented from being wound around the sheet conveying means.
【００１８】[0018]
【課題を解決するための手段】本発明は、シートを搬送
するシート搬送手段の近傍に、シート搬送ガイドを有す
る開閉可能なカバー部材を備えている画像形成装置に係
る。SUMMARY OF THE INVENTION The present invention relates to an image forming apparatus having an openable / closable cover member having a sheet conveying guide near a sheet conveying means for conveying a sheet.
【００１９】そして、本発明は、上記目的を達成するた
め、前記カバー部材のシート搬送ガイド部分に、前記シ
ート搬送手段を通過直後にジャムを起こしたシートの蛇
行部分をパス外へ逃がすジャムシート逃がし部を設けた
ことを特徴とする。In order to achieve the above-mentioned object, the present invention allows a sheet jam guide portion of the cover member, which allows the meandering portion of the sheet jammed immediately after passing the sheet conveying means to escape to the outside of the path. It is characterized by having a section.
【００２０】〔作用〕上記構成とした本発明の画像形成
装置によれば、前記シート搬送手段を通過直後にジャム
を起こしたシートに蛇行部分が形成されると、その蛇行
部分は前記シート逃がし部へ逃がされる。従って、蛇行
部分が駆動している前記シート搬送手段に巻き付いたり
しなくなる。[Operation] According to the image forming apparatus of the present invention having the above-described structure, when the meandering portion is formed on the jammed sheet immediately after passing through the sheet conveying means, the meandering portion causes the sheet escape portion. Be escaped to. Therefore, the meandering portion does not wind around the driven sheet conveying means.
【００２１】これにより、前記シート搬送手段等の部品
がシートのジャムによって損傷したりすることがなくな
り、また、ジャム処理も前記シート搬送手段を分解した
りせずに簡単に行える。As a result, the parts such as the sheet conveying means are not damaged by the jam of the sheet, and the jam can be easily treated without disassembling the sheet conveying means.
【００２２】[0022]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。 〈実施の形態１〉図１は本発明の実施の形態１に係る画
像形成装置（レーザービームプリンタ）の要部構成を示
す。Embodiments of the present invention will be described below with reference to the drawings. <Embodiment 1> FIG. 1 shows a main configuration of an image forming apparatus (laser beam printer) according to Embodiment 1 of the present invention.
【００２３】なお、本画像形成装置の構成を説明するに
当たり、上記従来例の画像形成装置（図９、図１０）と
同一の部材等には同一符号を付すと共に、構成的かつ機
能的に変わらないものについては、その説明を省略す
る。後述する実施の形態２、３、４の各画像形成装置に
ついても同様とする。In describing the structure of the present image forming apparatus, the same members and the like as those of the conventional image forming apparatus (FIGS. 9 and 10) are designated by the same reference numerals and are structurally and functionally different. Descriptions of those not included will be omitted. The same applies to each image forming apparatus of Embodiments 2, 3, and 4 described later.
【００２４】本画像形成装置においては、図２に示すよ
うに、ジャム処理用カバー部材１５の各シート搬送ガイ
ドリブ１８部分に、ジャムシートＪＳの蛇行部分を逃が
すための溝１９を設けている。In this image forming apparatus, as shown in FIG. 2, each sheet conveying guide rib 18 of the jam processing cover member 15 is provided with a groove 19 for allowing the meandering portion of the jam sheet JS to escape.
【００２５】また、ジャム処理用カバー部材１５をロッ
クするロック手段２０として、ジャム処理用カバー部材
１５を開こうとする一定の力が加わるとロック解除状態
となる構成のものが用いられている。このロック手段２
０は、垂直状のロックピン２１と、同ロックピン２１を
支持する支持部材２２からなる。支持部材２２は合成樹
脂やゴム金属の板バネやコイルバネ等の弾性部材によっ
て構成されている。Further, as the locking means 20 for locking the jam processing cover member 15, there is used a locking means 20 which is unlocked when a constant force for opening the jam processing cover member 15 is applied. This locking means 2
0 is composed of a vertical lock pin 21 and a support member 22 that supports the lock pin 21. The support member 22 is made of an elastic member such as a synthetic resin or rubber metal leaf spring or a coil spring.
【００２６】画像形成装置本体１側には、ロックピン２
１の頭部をガイドする傾斜面２３と、ロックピン２１の
頭部を嵌め込む穴２４が形成されている。ジャム処理用
カバー部材１５を矢印ａ方向に閉じる際、ロックピン２
１は支持部材２２が上下の方向にたわみ変形することで
傾斜面２３を摺接しながら穴２４に嵌め込まれ、ロック
状態になる。また、ジャム処理用カバー部材１５を矢印
ｂ方向に開く力が加わると、ロックピン２１は支持部材
２２が上下の方向にたわみ変形することで穴２４から抜
け出て、ロック解除状態になる。ここでは、ジャム処理
用カバー部材１５に約０．６kgｆ〜０．９kgｆ程度の開
く力（自然開放荷重）が加わると、ロックピン２１が穴
２４から抜け出るように設定されている。A lock pin 2 is provided on the main body 1 side of the image forming apparatus.
An inclined surface 23 that guides the head of the first pin and a hole 24 into which the head of the lock pin 21 is fitted are formed. When closing the jam handling cover member 15 in the direction of arrow a, the lock pin 2
In No. 1, the support member 22 is flexibly deformed in the up and down direction, so that the support member 22 is fitted into the hole 24 while slidingly contacting the inclined surface 23 to be in a locked state. When a force for opening the jam clearance cover member 15 in the direction of the arrow b is applied, the lock pin 21 comes out of the hole 24 as the support member 22 is flexed and deformed in the vertical direction, and the lock pin 21 is unlocked. Here, the lock pin 21 is set to come out of the hole 24 when an opening force (natural opening load) of about 0.6 kgf to 0.9 kgf is applied to the jam processing cover member 15.
【００２７】図３は、定着ローラ対１２を通過直後のシ
ートにジャムが起きた状態を示している。この場合のジ
ャムは、定着ローラ対１２を抜け出たシート先端が定着
分離爪３０先端に引掛かって搬送不能となったジャムで
ある。FIG. 3 shows a state in which a sheet has been jammed immediately after passing through the fixing roller pair 12. The jam in this case is a jam in which the leading end of the sheet that has passed through the fixing roller pair 12 is caught by the leading end of the fixing separation claw 30 and cannot be conveyed.
【００２８】シート先端が定着分離爪３０に突き当たる
とジャムシートＪＳは徐々に蛇行状態になるが、この蛇
行部分は時計回り方向に回転を続けている加圧ローラ１
２Ｂによってシート搬送ガイドリブ１８の方向へ寄せら
れ、図示のように、各シート搬送ガイドリブ１８の溝１
９に入って行く。従って、ジャムシートＪＳの蛇行部分
が加圧ローラ１２Ｂに巻き付くことはない。When the leading edge of the sheet hits the fixing / separating claw 30, the jammed sheet JS gradually becomes meandering, but the meandering portion continues to rotate clockwise in the pressure roller 1.
2B is moved toward the sheet conveyance guide ribs 18 and the groove 1 of each sheet conveyance guide rib 18 is moved as shown in the drawing.
Go into 9. Therefore, the meandering portion of the jam sheet JS does not wind around the pressure roller 12B.
【００２９】定着ローラ対１２下流の排紙パス３１に設
置されている不図示のシート検知手段から所定の時間が
経過しても検知信号が送られてこないと、画像形成装置
のＣＰＵはジャムが発生したと判断して、動作を停止す
ると共に、ジャムが発生した旨のメッセージを操作パネ
ル（不図示）等に表示する。If a detection signal is not sent from the sheet detection means (not shown) installed in the paper discharge path 31 downstream of the fixing roller pair 12 even if a predetermined time has passed, the CPU of the image forming apparatus will jam. When it is determined that the jam has occurred, the operation is stopped, and a message indicating that the jam has occurred is displayed on the operation panel (not shown) or the like.
【００３０】本実施の形態の場合、ジャムシートＪＳの
蛇行部分が溝１９に入り込むと、蛇行部分がジャム処理
用カバー部材１５に開く力（矢印Ａ方向の力）を与える
ので、ロックピン２１が穴２４から抜け出てロック解除
状態になり、図４に示すように、ジャム処理用カバー部
材１５は自然開放する。In the case of the present embodiment, when the meandering portion of the jam sheet JS enters the groove 19, the meandering portion gives a force for opening the jam processing cover member 15 (a force in the direction of arrow A). When the jam processing cover member 15 is released from the hole 24 and is in the unlocked state, the jam processing cover member 15 is naturally opened.
【００３１】この場合、ジャムシートＪＳは加圧ローラ
１２Ｂに巻き付いていないので、定着ローラ対１２を分
解せずに簡単にジャムシートＪＳを除去することができ
る。 〈実施の形態２〉上記実施の形態１では、ジャム処理用
カバー部材１５をロックするロック手段２０として、ジ
ャムシートＪＳの蛇行部分がジャム処理用カバー部材１
５に開く力を与えるとロック解除状態になる構成のもの
を設けているが、図５に示す本実施の形態においては、
マニュアル操作でロック解除を行うロックレバー１７を
設けている。 〈実施の形態３〉上記実施の形態１、２では、各シート
搬送ガイドリブ１８に設けた溝１８をジャムシートＪＳ
の蛇行部分の逃がし部としているが、図６に示す本実施
の形態においては、図７に示すように、各シート搬送ガ
イドリブ１８と、水平状のリブ２５とで形成される空間
３２を蛇行部分の逃がし部としている。この構成の場
合、蛇行部分はリブ２５にガイドされて円滑に空間３２
に入り込むことができる。 〈実施の形態４〉上記実施の形態１、２、３では、ジャ
ム処理用カバー部材１５にシート搬送ガイドリブ１８を
取り付けているが、図８に示す本実施の形態において
は、シート搬送ガイドリブ１８はジャム処理用カバー部
材１５とは別体の保持部材（カバー部材）２６に取り付
けている。In this case, since the jam sheet JS is not wound around the pressure roller 12B, the jam sheet JS can be easily removed without disassembling the fixing roller pair 12. <Embodiment 2> In the above-described Embodiment 1, the meandering portion of the jam sheet JS is the jam processing cover member 1 as the locking means 20 for locking the jam processing cover member 15.
5 is provided with a structure in which the unlocked state is given when an opening force is applied to 5. However, in the present embodiment shown in FIG.
A lock lever 17 for unlocking manually is provided. <Third Embodiment> In the first and second embodiments, the jam sheet JS is provided with the groove 18 provided in each sheet conveying guide rib 18.
In the present embodiment shown in FIG. 6, as shown in FIG. 7, the space 32 formed by each sheet conveying guide rib 18 and the horizontal rib 25 is a meandering portion. It is used as a relief section. In the case of this configuration, the meandering portion is guided by the ribs 25 and smoothly moves into the space 32.
You can get in. <Fourth Embodiment> In the first, second, and third embodiments, the sheet conveyance guide rib 18 is attached to the jam handling cover member 15. However, in the present embodiment shown in FIG. It is attached to a holding member (cover member) 26 separate from the jam processing cover member 15.
【００３２】保持部材２６はヒンジ軸２７を中心として
上下の方向に回動可能となるように設置されており、上
記実施の形態１と同様のロック手段２０を有している。
また、ジャム処理用カバー部材１５には、自然開放した
保持部材２６に押圧されるとロック解除状態になるロッ
ク爪２８が設けられている。The holding member 26 is installed so as to be rotatable in the vertical direction about the hinge shaft 27, and has the same locking means 20 as in the first embodiment.
Further, the jam processing cover member 15 is provided with a lock claw 28 that is unlocked when pressed by the holding member 26 that is naturally opened.
【００３３】[0033]
【発明の効果】以上説明したように、本発明の画像形成
装置においては、シート搬送手段を通過直後にジャムを
起こしたシートの蛇行部分をカバー部材のシートガイド
部分に設けたジャムシート逃がし部に逃がすようにした
ので、蛇行部分がシート搬送手段に巻き付いてシート搬
送手段等の部品が損傷したりすることがなくなる。ま
た、シート搬送手段を分解せずに簡単にジャム処理が行
えるようになる。As described above, in the image forming apparatus of the present invention, the meandering portion of the sheet that has jammed immediately after passing the sheet conveying means is used as the jam sheet escape portion provided in the sheet guide portion of the cover member. Since it is made to escape, the meandering portion does not wind around the sheet conveying means and the parts such as the sheet conveying means are not damaged. Further, it becomes possible to easily perform the jam processing without disassembling the sheet conveying means.
【図１】本発明の実施の形態１に係る画像形成装置（レ
ーザービームプリンタ）の要部構成を示す縦断側面図。FIG. 1 is a vertical cross-sectional side view showing the main configuration of an image forming apparatus (laser beam printer) according to a first embodiment of the present invention.
【図２】同実施の形態１の画像形成装置に備えられてい
るジャム処理用カバー部材の構成を示す斜視図。FIG. 2 is a perspective view showing a configuration of a jam processing cover member included in the image forming apparatus according to the first embodiment.
【図３】定着ローラ対を通過直後にジャムを起こしたシ
ートに蛇行部分が生じた状態を示す縦断側面図。FIG. 3 is a vertical cross-sectional side view showing a state where a meandering portion is generated in a jammed sheet immediately after passing through a pair of fixing rollers.
【図４】ジャム処理を行うためにジャム処理用カバー部
材を開いた状態を示す縦断側面図。FIG. 4 is a vertical cross-sectional side view showing a state in which a jam clearance cover member is opened for jam clearance.
【図５】本発明の実施の形態２に係る画像形成装置（レ
ーザービームプリンタ）の要部構成を示す縦断側面図。FIG. 5 is a vertical cross-sectional side view showing the main configuration of an image forming apparatus (laser beam printer) according to Embodiment 2 of the present invention.
【図６】本発明の実施の形態３に係る画像形成装置（レ
ーザービームプリンタ）の要部構成を示す縦断側面図。FIG. 6 is a vertical cross-sectional side view showing the main configuration of an image forming apparatus (laser beam printer) according to Embodiment 3 of the present invention.
【図７】同実施の形態３の画像形成装置に備えられてい
るジャム処理用カバー部材の構成を示す斜視図。FIG. 7 is a perspective view showing a configuration of a jam processing cover member included in the image forming apparatus according to the third embodiment.
【図８】本発明の実施の形態４に係る画像形成装置（レ
ーザービームプリンタ）の要部構成を示す縦断側面図。FIG. 8 is a vertical cross-sectional side view showing the main configuration of an image forming apparatus (laser beam printer) according to Embodiment 4 of the present invention.
【図９】従来例の画像形成装置（レーザービームプリン
タ）の全体構成を示す縦断側面図。FIG. 9 is a vertical sectional side view showing the overall configuration of a conventional image forming apparatus (laser beam printer).
【図１０】同従来例の画像形成装置の給紙部から排紙部
までの構成を拡大して示す縦断側面図。FIG. 10 is a vertical cross-sectional side view showing an enlarged configuration from a paper feed unit to a paper discharge unit of the conventional image forming apparatus.
【図１１】定着ローラ対を通過直後にジャムを起こした
シートに蛇行部分が生じた状態を示す縦断側面図。FIG. 11 is a vertical cross-sectional side view showing a state in which a meandering portion is generated in a sheet that has been jammed immediately after passing through a pair of fixing rollers.
【図１２】ジャム処理を行うためにジャム処理用カバー
部材を開いた状態を示す縦断側面図。FIG. 12 is a vertical cross-sectional side view showing a state in which a jam clearance cover member is opened for jam clearance.
１２ 定着ローラ対（シート搬送手段） １５ ジャム処理用カバー部材（カバー部材） １７ ロックレバー（ロック手段） １８ シート搬送ガイドリブ １９ 溝（ジャムシート逃がし部） ２０ ロック手段 ２６ 保持部材（カバー部材） ３２ 空間（ジャムシート逃がし部） ＪＳ ジャムシート 12 Fixing Roller Pair (Sheet Conveying Means) 15 Jam Handling Cover Member (Cover Member) 17 Lock Lever (Locking Means) 18 Sheet Conveying Guide Rib 19 Groove (Jam Sheet Releasing Part) 20 Locking Means 26 Holding Member (Cover Member) 32 Space (Jam sheet escape section) JS Jam sheet
Claims (6)
に、シート搬送ガイドを有する開閉可能なカバー部材を
備えている画像形成装置において、 前記カバー部材のシート搬送ガイド部分に、前記シート
搬送手段を通過直後にジャムを起こしたシートの蛇行部
分をパス外へ逃がすジャムシート逃がし部を設けたこと
を特徴とする画像形成装置。1. An image forming apparatus comprising an openable / closable cover member having a sheet conveying guide near a sheet conveying means for conveying a sheet, wherein the sheet conveying means is provided at a sheet conveying guide portion of the cover member. An image forming apparatus characterized in that a jam sheet escape portion is provided for allowing a meandering portion of a sheet having a jam immediately after passing to escape to the outside of the path.
向いている複数のシート搬送ガイドリブがシート搬送方
向に対して直交する方向に所定の間隔を置いて設置され
ていることを特徴とする請求項１記載の画像形成装置。2. The cover member is provided with a plurality of sheet conveying guide ribs which are oriented in the sheet conveying direction at predetermined intervals in a direction orthogonal to the sheet conveying direction. The image forming apparatus according to item 1.
ジャムシート逃がし部としての溝が形成されていること
を特徴とする請求項２記載の画像形成装置。3. The image forming apparatus according to claim 2, wherein each of the sheet conveying guide ribs is formed with a groove as the jammed sheet escape portion.
逃がし部へ逃げたジャムシートの蛇行部分による押圧力
によってロック解除するロック手段が設けられているこ
とを特徴とする請求項１記載の画像形成装置。4. The image forming apparatus according to claim 1, wherein the cover member is provided with a locking unit that unlocks by a pressing force of a meandering portion of the jam sheet that has escaped to the jam sheet escape portion. apparatus.
されたトナー像を加熱及び加圧して定着させる定着ロー
ラ対であることを特徴とする請求項１記載の画像形成装
置。5. The image forming apparatus according to claim 1, wherein the sheet conveying unit is a pair of fixing rollers that heat and pressurize and fix the toner image transferred on the sheet surface.
のジャム処理用カバーであることを特徴とする請求項１
記載の画像形成装置。6. The jam cover according to claim 1, wherein the cover member is a jam clearing cover.
The image forming apparatus as described in the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17916695A JP3524224B2 (en) | 1995-07-14 | 1995-07-14 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17916695A JP3524224B2 (en) | 1995-07-14 | 1995-07-14 | Image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0934202A true JPH0934202A (en) | 1997-02-07 |
| JP3524224B2 JP3524224B2 (en) | 2004-05-10 |
Family
ID=16061099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17916695A Expired - Fee Related JP3524224B2 (en) | 1995-07-14 | 1995-07-14 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3524224B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010085603A (en) * | 2008-09-30 | 2010-04-15 | Ricoh Co Ltd | Fixing device and image forming device |
| JP2011251787A (en) * | 2010-05-31 | 2011-12-15 | Brother Industries Ltd | Transporting apparatus |
| US8262079B2 (en) | 2010-09-27 | 2012-09-11 | Brother Kogyo Kabushiki Kaisha | Image recording apparatus with sheet conveyance path |
| JP2014108836A (en) * | 2012-11-30 | 2014-06-12 | Brother Ind Ltd | Sheet conveying device |
-
1995
- 1995-07-14 JP JP17916695A patent/JP3524224B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010085603A (en) * | 2008-09-30 | 2010-04-15 | Ricoh Co Ltd | Fixing device and image forming device |
| JP2011251787A (en) * | 2010-05-31 | 2011-12-15 | Brother Industries Ltd | Transporting apparatus |
| US8348418B2 (en) | 2010-05-31 | 2013-01-08 | Brother Kogyo Kabushiki Kaisha | Transporting apparatus and printer using the same |
| US8262079B2 (en) | 2010-09-27 | 2012-09-11 | Brother Kogyo Kabushiki Kaisha | Image recording apparatus with sheet conveyance path |
| JP2014108836A (en) * | 2012-11-30 | 2014-06-12 | Brother Ind Ltd | Sheet conveying device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3524224B2 (en) | 2004-05-10 |
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