JPH07225528A - Image recorder - Google Patents
Image recorderInfo
- Publication number
- JPH07225528A JPH07225528A JP3633694A JP3633694A JPH07225528A JP H07225528 A JPH07225528 A JP H07225528A JP 3633694 A JP3633694 A JP 3633694A JP 3633694 A JP3633694 A JP 3633694A JP H07225528 A JPH07225528 A JP H07225528A
- Authority
- JP
- Japan
- Prior art keywords
- pressing
- pressure
- upper cover
- pressing force
- roller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Fixing For Electrophotography (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、レーザビームプリンタ
等の画像記録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 an image recording device such as a laser beam printer.
【０００２】[0002]
【従来の技術】画像記録装置には、感光体や現像器等か
らなる画像記録部で記録媒体上に現像剤としてのトナー
を転写し、転写された記録像（トナー像）を定着させる
ための定着部が設けられている。2. Description of the Related Art In an image recording apparatus, a toner as a developer is transferred onto a recording medium in an image recording unit including a photoconductor and a developing device, and the transferred recording image (toner image) is fixed. A fixing unit is provided.
【０００３】図５および図６に、従来の定着部３０の概
略構成を示す。円筒状で金属材料製の加熱ローラー３１
は、発熱体３２を内蔵しておりフレーム３３に回転駆動
可能に設けられている。また、加圧ローラー３４はその
周面が、弾性材料（ゴム）で形成されており、この加圧
ローラー３４の軸受部３５は、フレーム３３に形成され
たガイド部（長孔）３６に摺動自在に保持され、加熱ロ
ーラー３１に対して接離可能とされている。なお、３７
は上記定着部３０に隣接された画像記録部である。これ
らの画像記録部３７や定着部３０は、軸３８を支点に開
閉自在に設けられた蓋体（上部カバー）３９によって覆
われていて、メンテナンスは、この上部カバー３９を開
放して行われる。FIG. 5 and FIG. 6 show a schematic structure of a conventional fixing unit 30. Cylindrical heating roller 31 made of metal material
Includes a heating element 32 and is rotatably provided on the frame 33. Further, the pressure roller 34 has a peripheral surface formed of an elastic material (rubber), and the bearing portion 35 of the pressure roller 34 slides on a guide portion (long hole) 36 formed on the frame 33. It is held freely and can be brought into and out of contact with the heating roller 31. 37
Is an image recording unit adjacent to the fixing unit 30. The image recording unit 37 and the fixing unit 30 are covered with a lid (upper cover) 39 that is openably and closably provided around a shaft 38 as a fulcrum, and maintenance is performed by opening the upper cover 39.
【０００４】画像記録部３７でトナー像が転写された記
録媒体（以下単に媒体という）Ｐは、加熱ローラー３１
と加圧ローラー３４との間を挿通される際に、加熱ロー
ラー３１からの熱と加圧ローラー３４による圧力とが加
えられ、当該媒体Ｐ上にトナー像が定着される。A recording medium (hereinafter simply referred to as a medium) P on which a toner image is transferred by the image recording section 37 is a heating roller 31.
When being inserted between the pressure roller 34 and the pressure roller 34, heat from the heating roller 31 and pressure from the pressure roller 34 are applied, and the toner image is fixed on the medium P.
【０００５】ここで、上記定着部３０には、常態におい
て加圧ローラー３４を加熱ローラー３１に所定圧力で押
圧し、かつ媒体Ｐの搬送が滞る媒体詰まり（ジャム）が
発生したときには、その媒体Ｐを取り出し易いように加
圧ローラー３４を加熱ローラー３１から離反可能に構成
された押圧離反手段４０が加圧ローラー３４の長手方向
両端にそれぞれ設けられている。Here, in the fixing unit 30, when the pressure roller 34 is normally pressed against the heating roller 31 with a predetermined pressure, and a medium jam (jam) in which the conveyance of the medium P is delayed occurs, the medium P is generated. In order to easily take out the pressure roller 34, pressure separating means 40 configured to separate the pressure roller 34 from the heating roller 31 are provided at both ends in the longitudinal direction of the pressure roller 34.
【０００６】押圧離反手段４０は、押圧機能を保有しつ
つジャム発生時に両ローラー３１、３４に無理な力が掛
からないように加圧ローラー３４を加熱ローラー３１に
ばね付勢し、上部カバー３９の開閉動作を利用して加圧
ローラー３４を加熱ローラー３１に対して押圧・離反可
能に形成されている。具体的には、押圧離反手段４０
は、第１レバー４１、第２レバー４２、連結ばね４３お
よび上部カバー３９の加圧部４４を含み構成されてい
る。The pressing / separating means 40 has a pressing function and biases the pressure roller 34 against the heating roller 31 so that an unreasonable force is not applied to both rollers 31 and 34 when a jam occurs, so that the upper cover 39 of the upper cover 39 is prevented. The pressure roller 34 can be pressed and separated from the heating roller 31 by using the opening / closing operation. Specifically, the pressure separating means 40
Includes a first lever 41, a second lever 42, a connecting spring 43, and a pressing portion 44 of the upper cover 39.
【０００７】第１レバー４１は、その長手方向の中間位
置で支軸４５を介してフレーム３３に揺動自在に装着さ
れている。この第１レバー４１の一端部４１ａには、上
部カバー３９閉鎖時に上部カバー３９の加圧部４４から
押圧力が掛けられる。The first lever 41 is swingably attached to the frame 33 via a support shaft 45 at an intermediate position in the longitudinal direction. A pressing force is applied to the one end portion 41a of the first lever 41 from the pressing portion 44 of the upper cover 39 when the upper cover 39 is closed.
【０００８】一方、第２レバー４２は、その長手方向の
一端部に支軸４６を介してフレーム３３に揺動自在に装
着されている。この第２レバー４２の長手方向の中央部
には、加圧ローラー３４の軸受部３５を加熱ローラー３
１へ向けて圧接可能な押圧部４２ｂが形成されている。
また、第２レバー４２の他端となる先端部４２ａと第１
レバー４１の他端部４１ｃとは、連結ばね４３によって
連結されている。On the other hand, the second lever 42 is swingably attached to the frame 33 via a support shaft 46 at one end portion in the longitudinal direction thereof. At the center of the second lever 42 in the longitudinal direction, the bearing portion 35 of the pressure roller 34 is attached to the heating roller 3.
A pressing portion 42b that can be pressed toward 1 is formed.
Further, the other end of the second lever 42, which is the other end of the second lever 42, and the first
The other end portion 41c of the lever 41 is connected by a connection spring 43.
【０００９】したがって、上部カバー３９を図６に示す
如く軸３８を支点に開放すると、加圧部４４が第１レバ
ー４１の一端部４１ａから離れ押圧力が解除され、第１
レバー４１が支軸４５を中心に時計方向に回動可能とな
り、かつ連結ばね４３の加圧ローラー３４に対する付勢
力も解除され第２レバー４２が支軸４６を支点として反
時計方向に回動可能となるため、加圧ローラー３４は自
重により降下して加熱ローラー３１より離反する。その
結果、両ローラー３１、３４間に挟み込まれた媒体Ｐを
簡単に取り出すことができる。Therefore, when the upper cover 39 is opened around the shaft 38 as a fulcrum as shown in FIG. 6, the pressing portion 44 is separated from the one end portion 41a of the first lever 41 to release the pressing force, and the first cover 41 is released.
The lever 41 can be rotated clockwise about the support shaft 45, and the urging force of the connecting spring 43 to the pressure roller 34 is also released, and the second lever 42 can be rotated counterclockwise about the support shaft 46 as a fulcrum. Therefore, the pressure roller 34 is lowered by its own weight and separated from the heating roller 31. As a result, the medium P sandwiched between the rollers 31 and 34 can be easily taken out.
【００１０】媒体Ｐのジャム処理後、上部カバー３９を
閉じると、図５に示すように第１レバー４１及び第２レ
バー４２は、上部カバー３９の開放状態とはそれぞれ逆
の作用方向となり、加圧部４４により第１レバー４１に
は再び押圧力が付与されて連結ばね４３を引っ張る。こ
れにより、加圧ローラー３４は、連結ばね４３の付勢力
で加熱ローラー３１に圧接される。When the upper cover 39 is closed after the jamming of the medium P, as shown in FIG. 5, the first lever 41 and the second lever 42 are in the opposite action directions to the opened state of the upper cover 39, and the additional force is applied. The pressing portion 44 applies a pressing force to the first lever 41 again to pull the connecting spring 43. As a result, the pressure roller 34 is pressed against the heating roller 31 by the urging force of the connecting spring 43.
【００１１】[0011]
【発明が解決しようとする課題】ところで、上記構成の
定着部を備えた従来の画像記録装置を運転して印字を行
うと、トナー像の定着が不安定となり印字が乱れて良好
な印字が得られない場合が発生した。By the way, when a conventional image recording apparatus having the above-mentioned fixing unit is operated to perform printing, the fixing of the toner image becomes unstable and the printing is disturbed to obtain good printing. Occasionally there are cases where it is not possible.
【００１２】そこで、この印字乱れの発生状況を調査し
てみたところ、装置運転初期に多発し、しかも輸送・保
管期間が長期に渡ったものほど定着が不安定となること
が判明した。また、装置を運転することなく長期間放置
しておいた場合にも、上記印字乱れが生じることが判明
した。[0012] Therefore, as a result of investigating the occurrence of this print disorder, it was found that the fixing becomes more unstable as it frequently occurs at the beginning of the operation of the apparatus and the transportation / storage period is long. It was also found that the above-mentioned print disorder occurs even when the apparatus is left for a long time without being operated.
【００１３】上記従来構造では、輸送・保管等のように
装置運転停止状態が長期に渡って続く場合には、梱包等
のためにカバーは閉じられ、押圧離反手段によって加圧
ローラーの周面のうち一部分のみが加熱ローラーに押圧
され続ける結果、その一部分が凹んだ状態となり、その
ため、この一部分の弾性復元力が経時変化等により弱ま
り、装置運転開始に伴い回転されても、すぐには元の形
状には戻らず、凹んだままの状態で媒体を加熱ローラー
に押圧するため加圧力が不足し、トナー像の定着が不安
定になることが究明された。In the above-mentioned conventional structure, when the operation of the apparatus is stopped for a long period of time such as transportation and storage, the cover is closed for packing and the peripheral surface of the pressure roller is pressed by the pressing and separating means. As a result, only a part of the part is continuously pressed by the heating roller, and a part of the part is dented.Therefore, the elastic restoring force of this part is weakened due to aging, etc. It has been determined that the medium is pressed against the heating roller in the state of being recessed without returning to the shape, so that the pressing force is insufficient and the fixing of the toner image becomes unstable.
【００１４】本発明の目的は、上記事情に鑑み、長期に
渡って装置運転停止状態にしておいた場合でも、現像剤
を安定して定着させ印字乱れの発生を防止することがで
きる画像記録装置を提供することにある。In view of the above circumstances, an object of the present invention is to provide an image recording apparatus capable of stably fixing the developer and preventing the occurrence of print disturbance even when the apparatus is stopped for a long period of time. To provide.
【００１５】[0015]
【課題を解決するための手段】すなわち、本発明に係る
画像記録装置は、記録媒体上に現像剤を付与して記録を
行う画像記録部と、平行に配置された加熱ローラーと加
圧ローラーとからなる一対のローラーを相対的に圧接可
能かつ圧接解除可能として圧接状態で前記記録媒体上の
記録像を定着する定着部と、前記一対のローラーの少な
くとも一方に作動し、押圧力が付与された場合に前記一
対のローラーを圧接状態とし、押圧力が付与されない場
合に前記一対のローラーの圧接状態を解除する作動機構
と、この作動機構に押圧力を付与する加圧部材を設ける
とともに前記画像記録部及び定着部を覆う開閉可能な蓋
体とを備えた画像記録装置において、前記加圧部材は、
前記蓋体閉鎖時に前記作動機構に押圧力を付与する押圧
位置と前記作動機構に押圧力を付与しない押圧解除位置
との位置を選択的に切り換え可能に構成したものであ
る。That is, an image recording apparatus according to the present invention comprises an image recording section for recording a recording medium by applying a developer, a heating roller and a pressure roller arranged in parallel. A pair of rollers which can be relatively pressure-contacted with each other and can be released from the pressure-fixing portion which fixes a recording image on the recording medium in a pressure-contact state, and is operated to at least one of the pair of rollers, and a pressing force is applied. In this case, the pair of rollers are brought into a pressure contact state, and an operating mechanism for releasing the pressure contact state of the pair of rollers when no pressing force is applied, and a pressurizing member for applying a pressing force to the operating mechanism are provided together with the image recording. In the image recording apparatus including an openable / closable lid that covers the fixing unit and the fixing unit, the pressure member is
When the lid is closed, a pressing position for applying a pressing force to the operating mechanism and a pressing release position for not applying a pressing force to the operating mechanism can be selectively switched.
【００１６】[0016]
【作用】上記構成による本発明では、輸送や保管等する
ため装置運転を長期間停止状態とする場合には、予め加
圧部材を作動機構に押圧力を付与しない押圧解除位置に
切り換えておく。これにより、蓋体を閉鎖した状態でも
加圧ローラーの加熱ローラーに対する圧接を解除させて
おくことができ、加圧ローラーの周面の一部分が加熱ロ
ーラーに圧接され続け経年変化等により弾性復元力が弱
まるようなことはない。そのため、装置運転時に、加圧
ローラーにより媒体を加熱ローラーに均一の力で圧接す
ることができ、現像剤による記録像を安定して媒体上に
定着できる。In the present invention having the above-described structure, when the apparatus operation is stopped for a long period of time for transportation or storage, the pressure member is previously switched to the pressure release position where no pressure is applied to the operating mechanism. With this, even when the lid is closed, the pressure roller can be released from the pressure contact with the heating roller, and a part of the peripheral surface of the pressure roller continues to be pressure-contacted with the heating roller, so that the elastic restoring force due to aging etc. There is no weakening. Therefore, during the operation of the apparatus, the medium can be pressed against the heating roller with a uniform force by the pressure roller, and the recorded image by the developer can be stably fixed on the medium.
【００１７】[0017]
【実施例】本発明の一実施例を図１乃至図４を参照して
説明する。画像記録装置１の内部には定着部２が配置さ
れている。筒状で金属材料製の加熱ローラー３は、発熱
体４を内蔵しており長手方向両端を一対のフレーム５に
回転駆動可能に支持されている。周面がゴムで形成され
た加圧ローラー６は、その長手方向両端を軸受部７によ
り回転支持されている。そしてこの軸受部７はフレーム
５に形成されたガイド部（長穴）８に摺動自在に保持さ
れて加熱ローラー３に対して接離可能とされている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. A fixing unit 2 is arranged inside the image recording apparatus 1. The cylindrical heating roller 3 made of a metal material has a built-in heating element 4 and is rotatably supported at both longitudinal ends by a pair of frames 5. The pressure roller 6 whose peripheral surface is made of rubber is rotatably supported by bearings 7 at both longitudinal ends thereof. The bearing portion 7 is slidably held by a guide portion (oblong hole) 8 formed in the frame 5 and can be brought into contact with and separated from the heating roller 3.
【００１８】また、定着部２に隣接して配置された画像
記録部９は、排トナー収納部を有する感光体ユニット１
０、レーザビームによる露光部１１および転写器１２等
から構成され、搬送されてくる媒体Ｐ上にトナー像を形
成する。そして画像記録装置１内の感光体ユニット１０
等の消耗部品の交換及びジャム発生時の媒体Ｐの除去を
行う場合開放される蓋体としての合成樹脂材から一体形
成された上部カバー１３が、支点１４を中心に開閉自在
に設けられている。なお、トナー像が形成された媒体Ｐ
は定着部２で定着された後、湾曲形状の搬送ガイド１５
に案内され一対の排紙ローラー１６により上部カバー１
３に形成された排紙受け１７に記録面を下にして排出さ
れる。The image recording section 9 disposed adjacent to the fixing section 2 has a photosensitive member unit 1 having a discharged toner storage section.
0, a laser beam exposure unit 11, a transfer unit 12, and the like, and forms a toner image on the medium P being conveyed. Then, the photoconductor unit 10 in the image recording apparatus 1
An upper cover 13, which is integrally formed of a synthetic resin material as a lid body that is opened when exchanging consumable parts such as the above and removing the medium P when a jam occurs, is provided so as to be openable and closable around a fulcrum 14. . The medium P on which the toner image is formed
After being fixed in the fixing unit 2, the curved conveyance guide 15
The upper cover 1 is guided by the pair of paper discharge rollers 16
The sheet is ejected with the recording surface facing down onto the sheet ejection receiver 17 formed in 3.
【００１９】加圧ローラー６の長手方向両端には、加圧
ローラー６を加熱ローラー３に対して圧接・圧接解除さ
せる作動機構１８がそれぞれ設けられ、フレーム５に取
り付けられた支軸１９に回動可能に装着された略Ｌ字状
のレバー２０で構成されている。このレバー２０は支軸
１９を中心に略直角に形成され、その一端部は加圧ロー
ラー６の軸受部７と係合して加圧ローラー６を加熱ロー
ラー３へ圧接可能な押圧部２１ｂが形成され、他端部に
は被押圧部２１ａが形成され、この被押圧部２１ａは後
述する加圧部材２２からの押圧力を確実に受ける周面を
有し、その軸芯は図面において紙面と直交する円柱状に
構成され、その一部には加圧部材２２と係合する溝２３
が設けられている。これにより、レバー２０の被押圧部
２１ａに付与される押圧力により、加圧ローラー６をレ
バー２０の押圧部２１ｂを介して加熱ローラー３へ所定
圧力で圧接させることができる。Actuating mechanisms 18 for pressing and releasing the pressure roller 6 from the heating roller 3 are provided at both ends in the longitudinal direction of the pressure roller 6, respectively, and are rotated on a support shaft 19 attached to the frame 5. It is composed of a substantially L-shaped lever 20 mounted so as to be possible. The lever 20 is formed substantially at a right angle around the support shaft 19, and one end of the lever 20 is engaged with the bearing portion 7 of the pressure roller 6 to form a pressing portion 21b capable of pressing the pressure roller 6 against the heating roller 3. A pressed portion 21a is formed at the other end, and the pressed portion 21a has a peripheral surface that reliably receives a pressing force from a pressing member 22 described later, and its axis is orthogonal to the plane of the drawing in the drawing. A groove 23 that is formed into a cylindrical shape and that engages with the pressing member 22
Is provided. As a result, the pressure roller 6 can be pressed against the heating roller 3 at a predetermined pressure via the pressing portion 21b of the lever 20 by the pressing force applied to the pressed portion 21a of the lever 20.
【００２０】なお、本実施例では、レバー２０の支軸１
９の位置を押圧部２１ｂに近い位置に設けているため、
梃の原理により比較的弱い押圧力で加圧ローラー６を加
熱ローラー３に圧接させることができ、上部カバー１３
を閉鎖する場合にも負担にはならないものである。In this embodiment, the support shaft 1 of the lever 20 is used.
Since the position 9 is provided near the pressing portion 21b,
By the principle of leverage, the pressure roller 6 can be pressed against the heating roller 3 with a relatively weak pressing force, and the upper cover 13
It does not become a burden when closing the.
【００２１】一方、加圧部材２２は、図２に示すように
上部カバー１３閉鎖時には作動機構１８のレバー２０の
被押圧部２１ａと係合して押圧力を付与し、かつ図３に
示すように上部カバー１３開放時には被押圧部２１ａと
の係合関係を解除するように構成されている。そして、
この加圧部材２２は、図１に示すように上部カバー１３
閉鎖時においてレバー２０の被押圧部２１ａより退避さ
せる位置に選択的に位置決めさせて係合関係を解除可能
に設けられている。On the other hand, the pressing member 22 engages with the pressed portion 21a of the lever 20 of the operating mechanism 18 to apply a pressing force when the upper cover 13 is closed as shown in FIG. 2, and as shown in FIG. When the upper cover 13 is opened, the engagement with the pressed portion 21a is released. And
As shown in FIG. 1, the pressurizing member 22 includes the upper cover 13
It is provided so that the engagement relationship can be released by selectively positioning it at a position retracted from the pressed portion 21a of the lever 20 when closed.
【００２２】具体的には、加圧部材２２は、上部カバー
１３の内側の作動機構に対向した位置にコの字形に形成
された保持板２４、２４に両側から弾性力が付与され、
挟まれた状態で支軸２５を介して回動可能に装着されて
いる。そして、この加圧部材２２は、図４に示すように
中空の円柱部２６と先端に加圧部２７を有し円柱部２６
より半径が小さい中空の円柱部２８とから構成され、円
柱部２８の中心には先端がＴ字形の軸２９が突設されて
いる。そしてこの円柱部２６の一端及び円柱部２８の一
端との間にコイル状ばね３０が軸２９に保持されつつ設
けられている。また、図１に示すように円柱部２８の側
面には軸方向に長溝３１が形成されていて、円柱部２６
に設けた弾性を有する爪部３２と嵌合して円柱部２８が
コイル状ばね３０の付勢力により円柱部２６から抜け出
ることを規制している。また、加圧部２７の表面は作動
機構１８の被押圧部２１ａの周面と当接し易いように円
弧状に形成されているとともに、被押圧部２１ａに形成
された溝２３と係合する突部３３が設けられている。Specifically, the pressure member 22 is provided with elastic force from both sides to the holding plates 24 and 24 formed in a U shape at a position facing the operating mechanism inside the upper cover 13.
It is rotatably attached via a support shaft 25 in a sandwiched state. As shown in FIG. 4, the pressurizing member 22 has a hollow columnar portion 26 and a pressurizing portion 27 at the tip thereof.
A hollow columnar portion 28 having a smaller radius is provided, and a T-shaped shaft 29 having a tip end is projectingly provided at the center of the columnar portion 28. A coil spring 30 is provided between one end of the column portion 26 and one end of the column portion 28 while being held by the shaft 29. Further, as shown in FIG. 1, a long groove 31 is formed on the side surface of the columnar portion 28 in the axial direction.
The columnar portion 28 is fitted with the elastic claw portion 32 provided in the above to prevent the columnar portion 28 from coming out of the columnar portion 26 by the urging force of the coiled spring 30. Further, the surface of the pressurizing portion 27 is formed in an arc shape so as to easily come into contact with the peripheral surface of the pressed portion 21a of the actuating mechanism 18, and a protrusion that engages with the groove 23 formed in the pressed portion 21a. A section 33 is provided.
【００２３】また、加圧部材２２の円柱部２８の保持板
２４、２４と相対向する周面には係合凸部３４が形成さ
れ、保持板２４、２４にはこの係合凸部３４と係合する
ことで、加圧部材２２を被押圧部２１ａと当接可能な押
圧位置に位置固定する係合凹部３５ａと加圧部材２２を
被押圧部２１ａとは当接しない押圧解除位置に位置固定
する係合凹部３５ｂとが形成されている。また、上部カ
バー１３には、加圧部材２２が押圧位置に位置したとき
加圧部２７の反対側と接触するストッパー３６が突設さ
れており、このストッパー３６は押圧位置をより確実に
位置決めするとともに、押圧力を付与する場合の補強の
役目も果たしている。Further, engaging protrusions 34 are formed on the peripheral surfaces of the cylindrical portion 28 of the pressing member 22 facing the holding plates 24, 24, and the holding protrusions 34, 24 are formed on the holding plates 24, 24. By engaging, the engaging recess 35a for fixing the pressure member 22 to a pressing position where it can abut the pressed portion 21a and the pressing member 22 are located in a pressing release position where the pressing member 21 does not abut. An engaging recess 35b for fixing is formed. Further, a stopper 36 is provided on the upper cover 13 so as to come into contact with the opposite side of the pressing portion 27 when the pressing member 22 is located at the pressing position. The stopper 36 positions the pressing position more reliably. At the same time, it also plays a role of reinforcement when a pressing force is applied.
【００２４】次に、この実施例の作用について説明す
る。輸送や保管時のように装置運転停止状態が長く続く
場合には、上部カバー１３を開放して、加圧部材２２の
係合凸部３４を保持板２４、２４間の自由側縁を拡開し
て図１に示す（図では片側のみ示す）ように係合凹部３
５ｂに係合させて押圧解除位置に位置固定させる。これ
により、上部カバー１３を閉鎖すると加圧部材２２の加
圧部２７はレバー２０の被押圧部２１ａより退避するた
め、作動機構１８に対して押圧力は付与されない。Next, the operation of this embodiment will be described. When the operation of the apparatus is stopped for a long time such as during transportation or storage, the upper cover 13 is opened and the engaging convex portion 34 of the pressing member 22 is expanded to the free side edge between the holding plates 24 and 24. Then, as shown in FIG. 1 (only one side is shown in the drawing), the engaging recess 3
5b is engaged and fixed in the pressing release position. As a result, when the upper cover 13 is closed, the pressing portion 27 of the pressing member 22 retracts from the pressed portion 21a of the lever 20, so that no pressing force is applied to the operating mechanism 18.
【００２５】その結果、上部カバー１３を閉鎖した状態
でも加圧ローラー６の加熱ローラー３に対する圧接を解
除させておくことができる。As a result, the pressure contact of the pressure roller 6 with the heating roller 3 can be released even when the upper cover 13 is closed.
【００２６】そして、装置を運転させる場合には、上部
カバー１３を開放して２か所の加圧部材２２の係合凸部
３４を図３に示す（図では片側のみ示す）ように係合凹
部３５ａに係合させて押圧位置に位置固定させ、上部カ
バー１３を閉鎖することにより、加圧部材２２は図２に
示すようにコイル状ばね３０により付勢されて加圧部２
７がレバー２０の被押圧部２１ａと突部３３、溝２３を
介して係合し加圧ローラー６は加熱ローラー３に押圧さ
れる。When the apparatus is operated, the upper cover 13 is opened and the engaging projections 34 of the two pressing members 22 are engaged as shown in FIG. 3 (only one side is shown in the figure). As the upper cover 13 is closed by engaging with the recess 35a and fixing the position at the pressing position, the pressing member 22 is biased by the coil spring 30 as shown in FIG.
7 is engaged with the pressed portion 21a of the lever 20 via the protrusion 33 and the groove 23, and the pressure roller 6 is pressed by the heating roller 3.
【００２７】以上この実施例によれば、レバー２０の被
押圧部２１ａに押圧力が付与された場合には加圧ローラ
ー６を加熱ローラー３に圧接させ、押圧力が付与されな
い場合には加圧ローラー６の加熱ローラー３に対する圧
接を解除する作動機構１８と、上部カバー１３に設けら
れ上部カバー１３閉鎖時にはレバー２０の被押圧部２１
ａと係合して押圧力を付与し、かつ上部カバー１３開放
時には被押圧部２１ａとの係合関係を解除する加圧部材
２２とから構成するとともに、この加圧部材２２を上部
カバー１３閉鎖時に被押圧部２１ａに押圧力を付与する
押圧位置と被押圧部２１ａに押圧力を付与しない押圧解
除位置とに選択的に切り換え可能に構成したので、輸送
・保管時等のように装置運転停止状態が長く続く場合
は、加圧部材２２を押圧解除位置に切り換えて上部カバ
ー１３を閉鎖しておくことで、加圧ローラー６の周面の
一部分が加熱ローラー３に圧接され続け経年変化等によ
り弾性復元力が弱まるのを防止することができる。その
結果、装置運転時にはトナー像を安定して定着させ印字
乱れを防止することができる。According to this embodiment, the pressing roller 6 is brought into pressure contact with the heating roller 3 when a pressing force is applied to the pressed portion 21a of the lever 20, and the pressing roller 6 is pressed when the pressing force is not applied. An operating mechanism 18 for releasing the pressure contact of the roller 6 with the heating roller 3, and a pressed portion 21 of the lever 20 provided on the upper cover 13 when the upper cover 13 is closed.
a pressure member 22 which engages with a to apply a pressing force and which releases the engagement relationship with the pressed portion 21a when the upper cover 13 is opened, and the pressure member 22 is closed. Since it is possible to selectively switch between a pressing position that applies a pressing force to the pressed portion 21a and a pressing release position that does not apply a pressing force to the pressed portion 21a, it is possible to stop the device operation such as during transportation and storage. When the state continues for a long time, the pressure member 22 is switched to the pressure release position and the upper cover 13 is closed, so that a part of the peripheral surface of the pressure roller 6 is continuously pressed against the heating roller 3 due to aging. It is possible to prevent the elastic restoring force from weakening. As a result, it is possible to stably fix the toner image during the operation of the apparatus and prevent the print disorder.
【００２８】また、作動機構１８を一つのレバーのみで
構成したので、定着部２周辺の部品点数を削減でき、装
置の小型化にも寄与することができる。Further, since the actuating mechanism 18 is composed of only one lever, the number of parts around the fixing portion 2 can be reduced and the apparatus can be made compact.
【００２９】さらに、上部カバー１３の加圧部材２２に
コイル状ばね３０を設けた構成としたので、上部カバー
１３を閉鎖した場合にコイル状ばね３０により押圧力が
調整され、加圧ローラー６の両端には常時所定の押圧力
が付与されることになり、さらにコイル状ばね３０を上
部カバー１３側に設けたことで一層の小型化に寄与する
ことができる。Further, since the pressing member 22 of the upper cover 13 is provided with the coiled spring 30, the pressing force is adjusted by the coiled spring 30 when the upper cover 13 is closed, and the pressing roller 6 moves. A predetermined pressing force is always applied to both ends, and the coil spring 30 is provided on the upper cover 13 side, which can contribute to further size reduction.
【００３０】なお、本実施例では、作動機構１８を押圧
力が付与されない場合に加圧ローラー６を加熱ローラー
３より離反させる構成としたが、離反させることなく加
圧ローラー６の加熱ローラー３に対する圧接を解除する
構成としても同様の効果が得られる。In this embodiment, the pressure roller 6 is separated from the heating roller 3 when the pressing mechanism is not applied to the actuating mechanism 18, but the pressure roller 6 does not move away from the heating roller 3. The same effect can be obtained even if the pressure contact is released.
【００３１】またさらに、本実施例では、加圧ローラー
６を加熱ローラー３へ圧接および離反可能に構成した定
着部２について述べたが、逆に加熱ローラー３を加圧ロ
ーラー６へ圧接可能に構成してもよいものである。Further, in the present embodiment, the fixing section 2 in which the pressure roller 6 can be pressed against and separated from the heating roller 3 has been described, but conversely, the heating roller 3 can be pressed against the pressing roller 6. You can do it.
【発明の効果】以上、本発明によれば、蓋体に設けた加
圧部材を、蓋体閉鎖時に作動機構に押圧力を付与させる
押圧位置と、作動機構に押圧力を付与しない押圧解除位
置との各位置に選択的に切り換え可能に構成したので、
輸送・保管時等のように装置運転停止状態が長く続く場
合は、加圧部材を押圧解除位置に切り換えて蓋体を閉鎖
しておくことで、加圧ローラーの周面の一部分が加熱ロ
ーラーに押圧され続け経年変化等により弾性復元力が弱
まるのを防止することができる。その結果、装置運転時
には記録像を安定して記録媒体に定着させ印字乱れを防
止することができる。As described above, according to the present invention, the pressing member provided on the lid body is pressed at a pressing position for applying a pressing force to the operating mechanism when the lid is closed, and a pressing releasing position at which no pressing force is applied to the operating mechanism. Since it can be selectively switched to each position of
If the equipment is not operating for a long time, such as during transportation and storage, switch the pressure member to the pressure release position to close the lid, so that part of the peripheral surface of the pressure roller becomes the heating roller. It is possible to prevent the elastic restoring force from weakening due to secular change due to continuous pressing. As a result, it is possible to stably fix the recorded image on the recording medium during the operation of the apparatus and prevent the print disorder.
【図１】本発明の実施例を示す図で、上部カバー閉鎖時
における作動機構への押圧を解除した状態を示す断面図
である。FIG. 1 is a view showing an embodiment of the present invention, and is a cross-sectional view showing a state in which pressing on an actuation mechanism is released when an upper cover is closed.
【図２】同じく、上部カバー閉鎖時における作動機構へ
の押圧状態を示す断面図である。FIG. 2 is a sectional view showing a state in which the operating mechanism is pressed when the upper cover is closed.
【図３】同じく、上部カバー開放状態を示す断面図であ
る。FIG. 3 is likewise a sectional view showing an open state of the upper cover.
【図４】同じく、加圧部材の断面図である。FIG. 4 is likewise a sectional view of a pressure member.
【図５】従来技術を示す図で、上部カバーを閉鎖して加
圧ローラーを加熱ローラーへ押圧した状態を示す断面図
である。FIG. 5 is a cross-sectional view showing a state in which the upper cover is closed and the pressure roller is pressed against the heating roller according to the related art.
【図６】同じく、上部カバーを開放して加圧ローラーを
加熱ローラーより離反した状態を示す断面図である。FIG. 6 is a sectional view showing a state in which the upper cover is opened and the pressure roller is separated from the heating roller.
２ 定着部 ３ 加熱ローラー ６ 加圧ローラー ９ 画像記録部 １３ 蓋体（上部カバー） １８ 作動機構 ２２ 加圧部材 Ｐ 記録媒体 2 fixing unit 3 heating roller 6 pressure roller 9 image recording unit 13 lid (upper cover) 18 operating mechanism 22 pressure member P recording medium
Claims (1)
う画像記録部と、 平行に配置された加熱ローラーと加圧ローラーとからな
る一対のローラーを相対的に圧接可能かつ圧接解除可能
として圧接状態で前記記録媒体上の記録像を定着する定
着部と、 前記一対のローラーの少なくとも一方に作動し、押圧力
が付与された場合に前記一対のローラーを圧接状態と
し、押圧力が付与されない場合に前記一対のローラーの
圧接状態を解除する作動機構と、 この作動機構に押圧力を付与する加圧部材を設けるとと
もに前記画像記録部及び定着部を覆う開閉可能な蓋体と
を備えた画像記録装置において、 前記加圧部材は、前記蓋体閉鎖時に前記作動機構に押圧
力を付与する押圧位置と前記作動機構に押圧力を付与し
ない押圧解除位置との位置を選択的に切り換え可能に構
成したことを特徴とする画像記録装置。1. An image recording unit for applying a developer onto a recording medium for recording, and a pair of rollers composed of a heating roller and a pressure roller, which are arranged in parallel, can be relatively pressed against each other and can be pressed against each other. As a fixing unit for fixing the recording image on the recording medium in a pressure contact state, the pair of rollers is actuated on at least one of the pair of rollers, and when a pressing force is applied, the pair of rollers is brought into a pressure contact state and a pressing force is applied. An operating mechanism that releases the pressure contact state of the pair of rollers when not performed, and a cover that is provided with a pressing member that applies a pressing force to the operating mechanism and that can be opened and closed to cover the image recording unit and the fixing unit. In the image recording device, the pressure member selectively selects a position between a pressing position that applies a pressing force to the operating mechanism and a pressing release position that does not apply a pressing force to the operating mechanism when the lid is closed. Image recording apparatus characterized by being switchably configured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3633694A JPH07225528A (en) | 1994-02-10 | 1994-02-10 | Image recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3633694A JPH07225528A (en) | 1994-02-10 | 1994-02-10 | Image recorder |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000335546A Division JP2001166627A (en) | 2000-11-02 | 2000-11-02 | Image recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07225528A true JPH07225528A (en) | 1995-08-22 |
Family
ID=12466995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3633694A Pending JPH07225528A (en) | 1994-02-10 | 1994-02-10 | Image recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07225528A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004109408A (en) * | 2002-09-18 | 2004-04-08 | Ricoh Co Ltd | Image forming apparatus |
| JP2006182035A (en) * | 2006-03-31 | 2006-07-13 | Kyocera Mita Corp | Image forming device |
| JP2006195489A (en) * | 2006-03-31 | 2006-07-27 | Kyocera Mita Corp | Image forming apparatus |
-
1994
- 1994-02-10 JP JP3633694A patent/JPH07225528A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004109408A (en) * | 2002-09-18 | 2004-04-08 | Ricoh Co Ltd | Image forming apparatus |
| JP2006182035A (en) * | 2006-03-31 | 2006-07-13 | Kyocera Mita Corp | Image forming device |
| JP2006195489A (en) * | 2006-03-31 | 2006-07-27 | Kyocera Mita Corp | Image forming apparatus |
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