JP3485362B2 - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JP3485362B2 JP3485362B2 JP26813394A JP26813394A JP3485362B2 JP 3485362 B2 JP3485362 B2 JP 3485362B2 JP 26813394 A JP26813394 A JP 26813394A JP 26813394 A JP26813394 A JP 26813394A JP 3485362 B2 JP3485362 B2 JP 3485362B2
- Authority
- JP
- Japan
- Prior art keywords
- protective cover
- paper
- image forming
- transfer
- sheet
- 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.)
- Expired - Fee Related
Links
Landscapes
- Paper Feeding For Electrophotography (AREA)
- Electrophotography Configuration And Component (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
Description
【0001】[0001]
【産業上の利用分野】本願発明は、上側に転写手段及び
用紙の搬送路を備えた上搬送型の電子式記録方式の画像
形成装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper conveyance type electronic recording type image forming apparatus having a transfer means and a paper conveyance path on the upper side.
【0002】[0002]
【従来の技術】従来の感光体上側に転写手段及び用紙の
搬送路を備えた上搬送型の画像形成装置においては、装
置本体の一部である上構造体側には、転写ローラと用紙
搬送ローラが配設され、下構造体には、感光体、現像手
段、定着手段、光書き込み手段、廃トナー回収手段が配
設されている。前記上構造体は開閉可能に軸支され、装
置本体内部の上面側に位置している用紙の搬送路を露出
させることができる。2. Description of the Related Art In a conventional upper conveyance type image forming apparatus having a transfer means and a sheet conveyance path on the upper side of a photoconductor, a transfer roller and a sheet conveyance roller are provided on the upper structure side which is a part of the apparatus main body. The lower structure is provided with a photoconductor, a developing unit, a fixing unit, an optical writing unit, and a waste toner collecting unit. The upper structure is pivotally supported so as to be openable and closable, so that the sheet conveyance path located on the upper surface side inside the apparatus main body can be exposed.
【0003】[0003]
【発明が解決しようとする課題】ところで、この上搬送
型の画像形成装置は、用紙の下面側にトナー像が転写さ
れ搬送されていくため、トナー転写後の用紙が用紙ガイ
ド面に接触しトナー像が擦られるという不具合があっ
た。また前記転写手段から定着手段にかけての用紙の搬
送路においては、用紙のジャムり、紙づまりが生じ易
く、その度に前記上構造体を開けて用紙を取り除く作業
をしなければならず、感光体が外光に触れて劣化するこ
と、あるいは手が触れたり工具に接触する等の外的刺激
で損傷が生じるという問題があった。By the way, in this upper conveyance type image forming apparatus, since the toner image is transferred and conveyed on the lower surface side of the paper, the paper after the toner transfer comes into contact with the paper guide surface and the toner is transferred. There was a problem that the image was rubbed. Further, in the paper conveyance path from the transfer means to the fixing means, paper jams and paper jams are likely to occur, and it is necessary to open the upper structure and remove the paper each time, and the photoconductor is There is a problem that it is deteriorated by being exposed to external light, or is damaged by an external stimulus such as being touched by a hand or coming into contact with a tool.
【0004】そのため前記上構造体に連動する感光体の
保護カバーを設けるとしたものが考えだされているが、
該保護カバーは画像形成中は感光体を蔽う位置から退避
させなければならず、その退避位置を設けることで装置
本体が膨大化したり、また前記保護カバーが、ジャムっ
た用紙を擦りながら感光体を蔽うので、保護カバーが汚
れてしまい感光体、廃トナー容器、トナー供給タンク等
の着脱の際、ユーザーの手を汚したり、装置本体内部を
見たときトナー汚れによる不快感を与えたりするという
問題があった。For this reason, it has been proposed to provide a protective cover for the photoconductor interlocking with the upper structure.
The protective cover must be retracted from the position covering the photoconductor during image formation, and by providing the retracted position, the main body of the apparatus becomes large, and the protective cover scrapes the jammed paper while the photoconductor is rubbed. Since the protective cover becomes dirty, the user's hands may get dirty when the photoconductor, the waste toner container, the toner supply tank, etc. are attached or detached, or the inside of the main body of the device may be uncomfortable due to toner stains. There was a problem.
【0005】本発明は、感光体を外光や外的刺激から保
護するとともに、画像形成時には用紙に転写したトナー
像を保護するようにガイドさせる画像形成装置を提供す
るのを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide an image forming apparatus which protects a photoconductor from external light and external stimuli and guides a toner image transferred onto a sheet during image formation so as to be protected.
【0006】[0006]
【課題を解決するための手段】上記目的を達成するため
に、請求項1に係る発明は、感光体の下側に光書き込み
手段を、上側に転写手段及び用紙の搬送路を配設した上
搬送型の画像形成装置において、両側端部の前後位置に
リンクの一端が取付けられ、該リンクの他端が装置筐体
等の不動部材に取付けられて、装置本体に形成した上構
造体の開閉動作に連動して屈曲動作し、該上構造体が開
くと延びて感光体の露出部を蔽い、該上構造体が閉じる
と感光体の露出部から退避して、当該露出部を露出させ
ると共に用紙のガイドをする保護カバーを設け、かつ、
該保護カバーの上面に、使用する用紙サイズ毎に、その
用紙幅方向の両端部を支持する一対のリブを設け、該リ
ブを用紙サイズが大きくなるに従い順次高くするように
したことを特徴とする。In order to achieve the above object, in the invention according to claim 1, an optical writing means is provided on the lower side of the photoconductor, and a transfer means and a sheet conveying path are provided on the upper side. In a transport-type image forming apparatus, one end of a link is attached to the front and rear positions of both end portions, and the other end of the link is attached to a stationary member such as an apparatus casing to open and close the upper structure formed in the apparatus main body. When the upper structure opens, it extends to cover the exposed portion of the photoconductor, and when the upper structure closes, it retracts from the exposed portion of the photoconductor to expose the exposed portion. A protective cover for guiding the paper is also provided, and
On the upper surface of the protective cover, a pair of ribs for supporting both end portions in the paper width direction are provided for each paper size to be used, and the ribs are sequentially raised as the paper size increases. .
【0007】また前記請求項2に係る発明は、前記保護
カバーの退避を、転写手段の後側、かつ定着手段の手前
側に位置させ、前記保護カバーの上面を用紙の定着入り
口ガイドとしたことを特徴とする。Further, in the invention according to claim 2, the retreat of the protective cover is located on the rear side of the transfer means and on the front side of the fixing means, and the upper surface of the protective cover serves as a sheet fixing entrance guide. Is characterized by.
【0008】また前記請求項3に係る発明は、前記保護
カバーの退避を、転写手段の手前側に位置させ、前記保
護カバーの上面を用紙の転写入り口ガイドとしたことを
特徴とする。The invention according to claim 3 is characterized in that the retreat of the protective cover is positioned on the front side of the transfer means, and the upper surface of the protective cover serves as a transfer entrance guide for the sheet.
【0009】 また請求項4に係る発明は、感光体の下
側に光書き込み手段を、上側に転写手段及び用紙の搬送
路を配設した上搬送型の画像形成装置において、両側端
部の前後位置にリンクの一端が取付けられ、該リンクの
他端が装置筐体等の不動部材に取付けられて、装置本体
に形成した上構造体の開閉動作に連動して屈曲動作し、
該上構造体が開くと延びて感光体の露出部を蔽い、該上
構造体が閉じると感光体の露出部から退避して、当該露
出部を露出させると共に用紙のガイドをする保護カバー
を設け、かつ、該保護カバーの上面に用紙搬送方向に沿
って、該用紙幅方向の中央から外側へ向かって順次高く
なるリブを設けたことを特徴とする。According to a fourth aspect of the present invention, in an upper conveyance type image forming apparatus in which an optical writing unit is provided on a lower side of a photoconductor and a transfer unit and a sheet conveyance path are provided on an upper side, front and rear sides of both side end portions are provided. One end of the link is attached to the position, the other end of the link is attached to an immovable member such as a device casing, and the bending operation is interlocked with the opening / closing operation of the upper structure formed in the device main body.
A protective cover that extends when the upper structure opens to cover the exposed portion of the photoconductor and retracts from the exposed portion of the photoconductor when the upper structure closes to expose the exposed portion and guide the paper. Ribs are provided on the upper surface of the protective cover, the ribs gradually increasing from the center in the paper width direction to the outside along the paper conveyance direction.
【0010】また前記請求項5に係る発明は、前記保護
カバーの退避を、転写手段の後側、かつ定着手段の手前
側に位置させ、前記保護カバーの上面を用紙の定着入り
口ガイドとしたことを特徴とする。Further, in the invention according to claim 5, the retreat of the protective cover is located on the rear side of the transfer means and on the front side of the fixing means, and the upper surface of the protective cover serves as a fixing entrance guide for the sheet. Is characterized by.
【0011】また前記請求項6に係る発明は、前記退避
を、転写手段の手前側に位置させ、前記保護カバーの上
面を用紙の転写入り口ガイドとしたことを特徴とする。Further, the invention according to claim 6 is characterized in that the retreat is located on the front side of the transfer means, and the upper surface of the protective cover serves as a transfer entrance guide for the sheet.
【0012】[0012]
【作用】前記請求項1記載の構成によれば、前記保護カ
バーの上面に、用紙サイズに対応し、該用紙の幅方向の
両端部を支持する一対のリブを、用紙幅が大きくなるに
つれて高くすることにより、用紙下面の画像形成領域で
ある部分が、前記保護カバーの平坦部及び他の用紙サイ
ズのリブに擦ることがないようにでき、かつ用紙の搬送
抵抗を低減させることができる。よって前記画像形成領
域にあるトナー像を擦って乱すようなこと、用紙の引っ
掛かりにより生じる、転写タイミングのズレ、あるいは
画像ブレ、ジッター等を防ぐことができる。According to the structure of the first aspect, a pair of ribs corresponding to a sheet size and supporting both ends in the width direction of the sheet are provided on the upper surface of the protective cover as the sheet width increases. By doing so, it is possible to prevent the portion of the lower surface of the sheet, which is the image forming area, from rubbing against the flat portion of the protective cover and the ribs of other sheet sizes, and reduce the sheet conveyance resistance. Therefore, it is possible to prevent the toner image in the image forming area from being rubbed and disturbed, and the transfer timing deviation, the image blurring, and the jitter, which are caused by the sheet being caught.
【0013】また前記請求項2記載の構成によれば、前
記保護カバーの退避を定着手段の手前に位置させ、かつ
定着入り口ガイドを兼ねることにより、転写後の用紙を
スムーズに定着手段に導くことができる。それととも
に、前記保護カバーの上面に用紙サイズに対応したリブ
を設けたことにより、用紙の下面に転写したトナー像を
擦るあるいは乱すことなく搬送案内ができる。また用紙
が定着手段手前でジャムった場合、その用紙を取除くた
めに装置本体を開けるが、そのとき上構造体に連動して
前記保護カバーが動作するので、ジャムった用紙の下面
が該保護カバーの上面を擦る場合がある。このとき前記
リブにより、用紙の下面部分にある画像形成領域内のト
ナー像を擦らないようにあるいは触れないようにできる
ので、トナーの飛散、トナーによる保護カバーの汚れが
防止できる。Further, according to the second aspect of the invention, the retreat of the protective cover is positioned in front of the fixing means and also serves as the fixing entrance guide, so that the sheet after transfer is smoothly guided to the fixing means. You can At the same time, by providing a rib corresponding to the paper size on the upper surface of the protective cover, it is possible to guide the conveyance without rubbing or disturbing the toner image transferred on the lower surface of the paper. Further, when the paper is jammed in front of the fixing means, the main body of the apparatus is opened to remove the paper, but at that time, since the protective cover operates in conjunction with the upper structure, the lower surface of the jammed paper is The top surface of the protective cover may be rubbed. At this time, the ribs can prevent the toner image in the image forming area on the lower surface of the paper from being rubbed or touched, so that toner scattering and contamination of the protective cover by the toner can be prevented.
【0014】また前記請求項3記載の構成によれば、前
記保護カバーの退避を転写手段の手前に位置させ、かつ
転写入り口ガイドを兼ねることにより、用紙を適切に転
写手段に導くことができ、また前記保護カバーの上面に
用紙サイズに対応したリブを設けたので、用紙との接触
面が低減できその分の搬送抵抗もなくなり、用紙をスム
ーズに搬送させることができる。よって転写前における
用紙先端の引っ掛かりが防止でき、転写時のタイミング
のズレ、さらには画像ブレやジッターの防止にもつなが
る。According to the third aspect of the invention, the sheet can be properly guided to the transfer means by arranging the withdrawal of the protective cover in front of the transfer means and also serving as the transfer entrance guide. Further, since the ribs corresponding to the paper size are provided on the upper surface of the protective cover, the contact surface with the paper can be reduced, and the corresponding transfer resistance is eliminated, so that the paper can be transferred smoothly. Therefore, it is possible to prevent the leading edge of the sheet from being caught before the transfer, which leads to the deviation of the timing at the time of transfer, and further the prevention of image blur and jitter.
【0015】また前記請求項4記載の構成によれば、前
記保護カバーの上面に、用紙搬送方向に沿って、該用紙
幅方向の中央から外側へ向かって順次高くしたリブを設
けたので、どんな用紙サイズでもその幅方向の両端部を
支持でき、かつ用紙がスキューしないように幅方向の規
制もできるので、用紙下面の画像形成領域である部分が
前記保護カバーの平坦部及び他の用紙サイズのリブに擦
ることがなく、かつ用紙搬送抵抗も低減できる。よって
前記画像形成領域にあるトナー像を擦って乱すようなこ
と、用紙の引っ掛かりにより生じる、転写タイミングの
ズレ、あるいは画像ブレ、ジッター等を防ぐことができ
る。Further, according to the structure of the fourth aspect, since the ribs are provided on the upper surface of the protective cover so as to be gradually increased from the center to the outside in the paper width direction along the paper conveyance direction, Even at the paper size, both widthwise end portions can be supported, and the widthwise direction can be restricted so that the paper does not skew. Therefore, the image forming area on the lower surface of the paper is the flat portion of the protective cover and other paper sizes. The ribs are not rubbed, and the paper transport resistance can be reduced. Therefore, it is possible to prevent the toner image in the image forming area from being rubbed and disturbed, and the transfer timing deviation, the image blurring, and the jitter, which are caused by the sheet being caught.
【0016】また前記請求項5記載の構成によれば、前
記保護カバーの退避を定着手段の手前に位置させ、かつ
定着入り口ガイドを兼ねることにより、転写後の用紙を
スムーズに定着手段に導くことができる。それととも
に、前記保護カバーの上面に、用紙搬送方向に沿って、
該用紙幅方向の中央から外側へ向かって順次高くしたリ
ブを設けているので、用紙下面の画像形成領域に転写し
たトナー像を、前記保護カバーの平坦部及び他のリブに
擦るあるいは乱すことがなくなる。また用紙が定着手段
手前でジャムった場合、その用紙を取除くために装置本
体を開けるが、そのとき上構造体に連動して前記保護カ
バーが動作するので、ジャムった用紙の下面が該保護カ
バーの上面を擦る場合がある。このとき前記リブにより
用紙の下面部分にあるトナー像を擦らないようにあるい
は触れないようにできるので、トナーの飛散、トナーに
よる保護カバーの汚れが防止できる。According to the structure of claim 5, the retreat of the protective cover is positioned in front of the fixing means and also serves as the fixing entrance guide, so that the sheet after transfer is smoothly guided to the fixing means. You can At the same time, on the upper surface of the protective cover, along the paper transport direction,
Since the ribs which are sequentially raised from the center in the paper width direction to the outside are provided, the toner image transferred to the image forming area on the lower surface of the paper can be rubbed or disturbed on the flat portion of the protective cover and other ribs. Disappear. Further, when the paper is jammed in front of the fixing means, the main body of the apparatus is opened to remove the paper, but at that time, since the protective cover operates in conjunction with the upper structure, the lower surface of the jammed paper is The top surface of the protective cover may be rubbed. At this time, the ribs can prevent the toner image on the lower surface of the paper from rubbing or touching, so that toner scattering and contamination of the protective cover by the toner can be prevented.
【0017】また前記請求項6記載の構成によれば、前
記保護カバーの退避を転写手段の手前に位置させ、転写
入り口ガイドを兼ねることにより、用紙を適切に転写手
段に導くことができ、また前記保護カバーの上面に、用
紙搬送方向に沿って、該用紙幅方向の中央から外側へ向
かって順次高くしたリブを設けることにより、用紙との
搬送抵抗が低減でき、かつ用紙がスキューしないように
幅方向の規制もできるので、用紙をスムーズに適正搬送
させることができる。よって転写前における用紙先端の
引っ掛かりが防止でき、転写時のタイミングのズレ、さ
らには画像ブレ、ジッターの防止にもつながる。Further, according to the structure of the sixth aspect, by arranging the retreat of the protective cover in front of the transfer means and also serving as the transfer entrance guide, the paper can be properly guided to the transfer means, and By providing ribs on the upper surface of the protective cover, which are sequentially increased from the center to the outside in the paper width direction along the paper conveyance direction, the conveyance resistance with the paper can be reduced and the paper does not skew. Since the width direction can be regulated, the paper can be smoothly and properly conveyed. Therefore, it is possible to prevent the leading edge of the paper sheet from being caught before the transfer, which leads to the deviation of the timing at the time of transfer, and further the prevention of the image blur and the jitter.
【0018】[0018]
【実施例】以下、図面を参照して本発明の実施例を詳細
に説明する。Embodiments of the present invention will now be described in detail with reference to the drawings.
【0019】図1は本発明の一実施例の画像形成装置の
構成図を示したものである。1は装置本体で、上構造体
1aと下構造体1bとから構成されている。前記上構造
体1aは前記下構造体1bに軸Xによって開閉自在に軸
支されている。2は感光体で、その周囲に帯電手段3、
現像手段4、転写手段5、クリーニング手段6および前
記感光体2上に潜像させる光書き込み手段8が配設され
ている。9は用紙Pを内在させた給紙カセットで、該用
紙Pは給紙ローラ10により繰り出され、レジストロー
ラ11と同期をとって感光体2の上側に搬送される。前
記感光体2は矢印方向に回転し、前記帯電手段3によっ
て一様に帯電された後、前記光書き込み手段8からのレ
ーザー光に照射されて静電潜像を形成する。この静電潜
像は現像手段4のトナーによって可視像化される。この
トナーの可視像は前記感光体2の上側に搬送されてきた
用紙Pの下面に転写手段5により転写され、さらに定着
手段7によって定着される。該定着手段7から送り出さ
れた用紙Pは排紙ローラ12によって排紙トレイ13に
スタックされる。FIG. 1 is a block diagram of an image forming apparatus according to an embodiment of the present invention. Reference numeral 1 denotes an apparatus main body, which includes an upper structure 1a and a lower structure 1b. The upper structure 1a is pivotally supported on the lower structure 1b by an axis X so as to be openable and closable. 2 is a photoconductor, around the charging means 3,
A developing unit 4, a transfer unit 5, a cleaning unit 6, and an optical writing unit 8 for forming a latent image on the photoconductor 2 are provided. Reference numeral 9 denotes a paper feed cassette containing a paper P therein. The paper P is fed out by a paper feed roller 10 and conveyed to the upper side of the photoconductor 2 in synchronization with the registration roller 11. The photoconductor 2 rotates in the direction of the arrow, is uniformly charged by the charging means 3, and then is irradiated with the laser beam from the optical writing means 8 to form an electrostatic latent image. This electrostatic latent image is visualized by the toner of the developing means 4. The visible image of the toner is transferred to the lower surface of the paper P conveyed to the upper side of the photoconductor 2 by the transfer means 5, and further fixed by the fixing means 7. The paper P sent out from the fixing means 7 is stacked on the paper discharge tray 13 by the paper discharge rollers 12.
【0020】20は感光体2の一部を蔽う保護カバー
で、その上面にはリブ21が形成されている。図1にお
いては、前記保護カバー20は、前記感光体2を蔽う位
置にあり、前記上構造体1aが開いている状態のときで
ある。この保護カバー20はその両端側で各一対のリン
ク20a及び20bとで支持され、該リンク20a、2
0bの他端は図示しない感光体ユニットの側板、あるい
は装置本体1の側板に設けられた軸に係合している。前
記保護カバー20は、常に感光体2を蔽う方向に図示し
ないバネ部材で付勢されている。16は上構造体1aに
形成された突き当て部で、前記上構造体1aを閉じると
きに、前記保護カバー20の開閉受部20cに突き当た
り、該保護カバー20を前記感光体2を蔽う位置から退
避する方向に移動させするようにしている。Reference numeral 20 is a protective cover for covering a part of the photosensitive member 2, and ribs 21 are formed on the upper surface thereof. In FIG. 1, the protective cover 20 is at a position that covers the photoconductor 2 and the upper structure 1a is open. The protective cover 20 is supported by a pair of links 20a and 20b at both ends thereof, and the links 20a, 2b
The other end of 0b is engaged with a side plate of a photoconductor unit (not shown) or a shaft provided on the side plate of the apparatus main body 1. The protective cover 20 is always biased by a spring member (not shown) in a direction to cover the photoconductor 2. Reference numeral 16 denotes an abutting portion formed on the upper structure 1a, which abuts the opening / closing receiving portion 20c of the protective cover 20 when the upper structure 1a is closed, so that the protective cover 20 is covered from the position where the photoconductor 2 is covered. It is designed to be moved in the evacuation direction.
【0021】図2は、本発明の第1実施例の保護カバー
の断面図を示す。この断面は保護カバー20の紙幅方向
に沿って断面したもので、各紙サイズA4、B4、A3
に対応する一対のリブ21a、21b、21cが、内側
から外側に順次高さを上げながら設けられている。した
がって紙サイズA3の用紙が搬送ガイドされるときに
は、前記リブ21a、21bの頭部には触れることなく
搬送される。FIG. 2 shows a sectional view of the protective cover of the first embodiment of the present invention. This cross section is taken along the paper width direction of the protective cover 20, and each paper size A4, B4, A3.
Is provided with a pair of ribs 21a, 21b, 21c, which sequentially increase in height from the inside to the outside. Therefore, when the paper of the paper size A3 is guided, it is carried without touching the heads of the ribs 21a and 21b.
【0022】図3は、本発明の第2実施例に係る保護カ
バーの退避位置の構成図である。保護カバー20は、上
構造体1aを閉じたときには、感光体2を蔽う位置から
定着手段7の手前位置に退避している。この退避位置で
前記保護カバー20の上面は、用紙を定着手段7に案内
する定着入り口ガイドの機能を果たしている。この上面
には各紙サイズA4、B4、A3に対応する一対のリブ
21a、21b、21cが、内側から外側に順次高さを
上げながら設けられているので、用紙下面に形成された
トナー像を擦るあるいは壊すことなく定着入り口まで案
内できる。また用紙が定着手段7手前あるいは上搬送路
でジャムった場合、その用紙を取除くために上構造体1
aを開けるが、そのとき前記上構造体1aに連動して前
記保護カバー20が動作するので、トナー転写後の用紙
の下面を滑るようにして前記保護カバー20が感光体2
の蔽う位置に移動する。このとき前記リブ21により用
紙の下面部分にある画像形成領域内のトナー像を擦らな
いようにあるいは触れないようにしているので、トナー
の飛散、トナーによる保護カバーの汚れが防止できる。FIG. 3 is a configuration diagram of the retracted position of the protective cover according to the second embodiment of the present invention. When the upper structure 1a is closed, the protective cover 20 is retracted from the position covering the photoconductor 2 to the position in front of the fixing unit 7. At the retracted position, the upper surface of the protective cover 20 functions as a fixing entrance guide that guides the sheet to the fixing unit 7. Since a pair of ribs 21a, 21b, 21c corresponding to the respective paper sizes A4, B4, A3 are provided on the upper surface while increasing the height from the inner side to the outer side, the toner image formed on the lower surface of the paper is rubbed. Or you can guide to the fixing entrance without breaking. When the paper jams before the fixing unit 7 or in the upper transport path, the upper structure 1 is used to remove the paper.
a is opened, but at that time, since the protective cover 20 operates in conjunction with the upper structure 1a, the protective cover 20 slides on the lower surface of the sheet after the toner transfer, and the protective cover 20 moves to the photosensitive member 2a.
Move to the position covered by. At this time, the ribs 21 prevent the toner image in the image forming area on the lower surface of the paper from rubbing or touching, so that toner scattering and contamination of the protective cover by the toner can be prevented.
【0023】図4は、本発明の第3実施例に係る保護カ
バーの退避位置の構成図である。保護カバー20は、上
構造体1aを閉じたときには、感光体2を蔽う位置から
転写手段の手前位置に退避している。この退避位置で前
記保護カバー20の上面は、用紙を転写手段に案内する
転写入り口ガイドの機能を果たしている。この上面には
各紙サイズA4、B4、A3に対応する一対のリブ21
a、21b、21cが、内側から外側に順次高さを上げ
ながら設けられているので、用紙との接触面が低減でき
その分の搬送抵抗もなくなり、用紙をスムーズに搬送さ
せることができる。よって転写前における用紙先端の引
っ掛かりが防止でき、転写時のタイミングのズレも防げ
る。よって画像ブレやジター等の不具合も防止できる。FIG. 4 is a configuration diagram of the retracted position of the protective cover according to the third embodiment of the present invention. When the upper structure 1a is closed, the protective cover 20 is retracted from the position covering the photoconductor 2 to the position in front of the transfer means. At the retracted position, the upper surface of the protective cover 20 functions as a transfer entrance guide that guides the sheet to the transfer unit. A pair of ribs 21 corresponding to each paper size A4, B4, A3 is provided on the upper surface.
Since the heights a, 21b, and 21c are sequentially increased from the inner side to the outer side, the contact surface with the paper can be reduced, and the conveyance resistance corresponding to that can be eliminated, so that the paper can be smoothly conveyed. Therefore, it is possible to prevent the leading edge of the sheet from being caught before the transfer, and prevent the timing deviation during the transfer. Therefore, problems such as image blurring and jitter can be prevented.
【0024】また17は、前記上構造体1aに設けられ
た押し当て部17で、該上構造体1aが開き状態から閉
じるときに、前記保護カバー20の開閉受部20cの頭
部に突き当たり、該押し当て部17の輪郭形状に沿って
該保護カバー20を前記感光体2を蔽う位置から退避す
る方向に移動させするようにしている。Reference numeral 17 denotes a pressing portion 17 provided on the upper structure 1a, which, when the upper structure 1a is closed from the open state, hits the head of the opening / closing receiving portion 20c of the protective cover 20, The protective cover 20 is moved along the contour of the pressing portion 17 in the direction of retracting from the position covering the photoconductor 2.
【0025】図5は、本発明の第4実施例に係る保護カ
バーの断面図を示す。この断面は保護カバー30の紙幅
方向に沿って断面したもので、用紙搬送方向に沿って、
該用紙幅方向の中央から外側へ向かって順次高くなるリ
ブ31を設けている。このリブ31を形成することによ
り、用紙の下面部分である画像形成領域に触れないよう
にでき、また用紙の搬送抵抗も低減させることができ
る。さらに前記保護カバーが退避した位置で用紙のガイ
ドをするときに、どんな用紙サイズでも、例えばハガキ
のようなものでもその幅方向の両端部を支持でき、かつ
用紙がスキューしないように幅方向の規制もできる。FIG. 5 shows a sectional view of a protective cover according to a fourth embodiment of the present invention. This cross section is taken along the paper width direction of the protective cover 30.
The ribs 31 are provided so as to become higher from the center in the paper width direction toward the outside. By forming the ribs 31, it is possible to prevent the image forming area, which is the lower surface portion of the sheet, from being touched, and also it is possible to reduce the conveyance resistance of the sheet. Furthermore, when guiding the paper at the position where the protective cover is retracted, any paper size, such as a postcard, can support both widthwise ends thereof, and the widthwise regulation is performed so that the paper does not skew. You can also
【0026】また本発明の第5実施例に係る保護カバー
の退避位置は、前記第3図と同様である。ただし前記保
護カバーの上面形成が異なる。この保護カバー30は、
上構造体1aを閉じたときには、感光体2を蔽う位置か
ら定着手段の手前位置に退避している。この退避位置で
前記保護カバー30の上面は、用紙を定着手段に案内す
る定着入り口ガイドの機能を果たしている。この上面に
は、用紙搬送方向に沿って、該用紙幅方向の中央から外
側へ向かって順次高くなるリブ31を設けている。この
リブ31を形成することにより、前記保護カバーが退避
した位置で用紙のガイドをするときに、どんな用紙サイ
ズでもその幅方向の両端部を支持でき、かつ用紙がスキ
ューしないように幅方向の規制もできる。また用紙が定
着手段7手前あるいは上搬送路でジャムった場合、その
用紙を取除くために上構造体1aを開けるが、そのとき
前記上構造体1aに連動して前記保護カバー30が動作
するので、トナー転写後の用紙の下面を滑るようにして
前記保護カバー30が感光体2の蔽う位置に移動する。
このとき前記リブ31により、用紙の下面部分にある画
像形成領域内のトナー像を擦らないようにあるいは触れ
ないように、かつ幅方向にスキューしないように規制で
きるので、トナーの飛散、トナーによる保護カバーの汚
れが確実に防止できる。The retracted position of the protective cover according to the fifth embodiment of the present invention is the same as that shown in FIG. However, the formation of the upper surface of the protective cover is different. This protective cover 30
When the upper structure 1a is closed, the upper structure 1a is retracted from the position covering the photoconductor 2 to the position before the fixing unit. At this retracted position, the upper surface of the protective cover 30 functions as a fixing entrance guide for guiding the sheet to the fixing means. Ribs 31 are provided on the upper surface in order of increasing height from the center in the paper width direction to the outside along the paper conveyance direction. By forming the ribs 31, when guiding the paper at the position where the protective cover is retracted, both widthwise end portions of any paper size can be supported, and the widthwise regulation is performed so that the paper does not skew. You can also When the sheet jams before the fixing unit 7 or in the upper conveyance path, the upper structure 1a is opened to remove the sheet, and at that time, the protective cover 30 operates in conjunction with the upper structure 1a. Therefore, the protective cover 30 moves to the position covered by the photoconductor 2 while sliding on the lower surface of the sheet after the toner transfer.
At this time, the ribs 31 can regulate the toner image in the image forming area on the lower surface of the paper so as not to rub or touch it and skew in the width direction. The cover can be reliably prevented from becoming dirty.
【0027】また本発明の第6実施例に係る保護カバー
の退避位置は、前記第4図と同様である。ただし前記保
護カバーの上面形成が異なる。この保護カバー30は、
上構造体1aを閉じたときには、感光体2を蔽う位置か
ら転写手段5の手前位置に退避している。この退避位置
で前記保護カバー30の上面は、用紙を転写手段5に案
内する転写入り口ガイドの機能を果たしている。この上
面には、用紙搬送方向に沿って、該用紙幅方向の中央か
ら外側へ向かって順次高くなるリブ31を設けている。
このリブ31を形成することにより、前記保護カバーが
退避した位置で用紙のガイドをするときに、どんな用紙
サイズでもその幅方向の両端部を支持でき、かつ用紙が
スキューしないように幅方向の規制もできるので、用紙
との接触面が低減できその分の搬送抵抗もなくなり、用
紙をスムーズに搬送させることができる。よって転写前
における用紙先端の引っ掛かりが防止でき、転写時のタ
イミングのズレも防げ、画像ブレやジター等の防止にも
つながる。The retracted position of the protective cover according to the sixth embodiment of the present invention is the same as that shown in FIG. However, the formation of the upper surface of the protective cover is different. This protective cover 30
When the upper structure 1a is closed, the upper structure 1a is retracted from the position covering the photoconductor 2 to the position before the transfer means 5. At the retracted position, the upper surface of the protective cover 30 functions as a transfer entrance guide that guides the sheet to the transfer unit 5. Ribs 31 are provided on the upper surface in order of increasing height from the center in the paper width direction to the outside along the paper conveyance direction.
By forming the ribs 31, when guiding the paper at the position where the protective cover is retracted, both widthwise end portions of any paper size can be supported, and the widthwise regulation is performed so that the paper does not skew. Since it is also possible to reduce the contact surface with the paper, the conveyance resistance is eliminated, and the paper can be smoothly conveyed. Therefore, it is possible to prevent the leading edge of the sheet from being caught before the transfer, prevent the timing deviation at the time of transfer, and prevent image blurring and jitter.
【0028】尚、前記保護カバー上面に形成するリブの
頭部を段差を付けて、紙幅方向を規制し用紙のスキュー
防止をさせてもよい。The heads of the ribs formed on the upper surface of the protective cover may be stepped to regulate the paper width direction to prevent skew of the paper.
【0029】また前記保護カバー上面を紙幅方向の中央
から外側に沿って階段状に構成してもよい。The upper surface of the protective cover may be formed in a step shape from the center in the paper width direction to the outside.
【0030】[0030]
【発明の効果】前記請求項1、4に係る発明によれば、
用紙サイズに対応て一対のリブを設けるようにしたの
で、用紙の下面に転写したトナー像が、前記保護カバー
の平坦部及び他の用紙サイズのリブに擦ることがない。
したがって用紙下面に形成したトナー像を乱すことな
く、高品質な記録画像が得られるとともに、トナーの飛
散や付着が防げる。また用紙の搬送抵抗も低減でき、ジ
ャムりの発生を低減できる。さらに保護カバーの強度向
上が図れる。According to the inventions of claims 1 and 4,
Since the pair of ribs are provided according to the paper size, the toner image transferred to the lower surface of the paper does not rub against the flat portion of the protective cover and the ribs of other paper sizes.
Therefore, a high-quality recorded image can be obtained without disturbing the toner image formed on the lower surface of the paper, and toner scattering and adhesion can be prevented. Further, it is possible to reduce the conveyance resistance of the paper and reduce the occurrence of jam. Further, the strength of the protective cover can be improved.
【0031】また前記請求項2、5に係る発明によれ
ば、保護カバーの退避を定着前に位置させたので、用紙
下面に形成した未定着トナー像を擦ることや乱すことを
防止できる。また画像ブレやジッター等の不具合の発生
を防ぎ、高品質の記録画像を得ることができる。またジ
ャムの処理時には、保護カバーの汚れあるいはトナーの
飛散を防ぐことができる。さらに搬送路の簡素化やコス
トダウン化が図れる。Further, according to the second and fifth aspects of the invention, since the retraction of the protective cover is positioned before the fixing, it is possible to prevent rubbing or disturbing the unfixed toner image formed on the lower surface of the paper. Further, it is possible to prevent the occurrence of defects such as image blur and jitter, and obtain a high quality recorded image. Further, when the jam is processed, it is possible to prevent the protective cover from being soiled or the toner from scattering. Further, the transport path can be simplified and the cost can be reduced.
【0032】また前記請求項3、6に係る発明によれ
ば、保護カバーの退避を転写前に位置させたので、スム
ーズに転写位置まで用紙をガイドでき、ジャムりの低減
が図れ、さらに転写タイミングのズレを生じさせないよ
うにできるので、画像の位置ズレ、画像の乱れ、ブレ、
ジッター等がなくなり、高品質の記録画像が得られる。
また搬送路の簡素化やコストダウン化が図れる。Further, according to the third and sixth aspects of the invention, since the retreat of the protective cover is positioned before the transfer, the sheet can be smoothly guided to the transfer position, the jam can be reduced, and the transfer timing can be further improved. Since it is possible to prevent misalignment of the image, image misalignment, image distortion, blurring,
High quality recorded images can be obtained by eliminating jitter.
In addition, the transport path can be simplified and the cost can be reduced.
【図1】本発明の一実施例の画像形成装置の構成図であ
る。FIG. 1 is a configuration diagram of an image forming apparatus according to an embodiment of the present invention.
【図2】本発明の第1実施例に係る保護カバーの断面図
である。FIG. 2 is a sectional view of a protective cover according to a first embodiment of the present invention.
【図3】本発明の第2,5実施例に係る保護カバーの退
避位置の構成図である。FIG. 3 is a configuration diagram of a retracted position of a protective cover according to second and fifth embodiments of the present invention.
【図4】本発明の第3,6実施例に係る保護カバーの退
避位置の構成図である。FIG. 4 is a configuration diagram of a retracted position of a protective cover according to third and sixth embodiments of the present invention.
【図5】本発明の第4実施例に係る保護カバーの断面図
である。FIG. 5 is a sectional view of a protective cover according to a fourth embodiment of the present invention.
1…装置本体 2…感光体 3…帯電手段 4…現像手段 5…転写手段 6…クリーニング手段 7…定着手段 8…光書き込み手段 9…給紙カセット 10…給紙ローラ 11…レジストローラ 12…排紙ローラ 13…排紙トレイ 15…搬送ガイド板 16…突きあて部 20,30…保護カバー 17…押し当て部 20a,20b,30a,30b…リンク部 20c,30c…開閉受部 21,31…リブ 1 ... Device body 2 ... Photoconductor 3 ... Charging means 4 ... Developing means 5 ... Transferring means 6 ... Cleaning means 7: fixing means 8 ... Optical writing means 9 ... Paper feed cassette 10 ... Paper feed roller 11 ... Registration roller 12 ... Ejection roller 13 ... Paper ejection tray 15 ... Transport guide plate 16… Pointing part 20, 30 ... Protective cover 17 ... Pushing part 20a, 20b, 30a, 30b ... Link part 20c, 30c ... Open / close receiving part 21, 31 ... Ribs
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) G03G 15/00 ─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) G03G 15/00
Claims (6)
に転写手段及び用紙の搬送路を配設した上搬送型の画像
形成装置において、 両側端部の前後位置にリンクの一端が取付けられ、該リ
ンクの他端が装置筐体等の不動部材に取付けられて、装
置本体に形成した上構造体の開閉動作に連動して屈曲動
作し、該上構造体が開くと延びて前記感光体の露出部を
蔽い、該上構造体が閉じると前記感光体の露出部から退
避して、当該露出部を露出させると共に用紙のガイドを
する保護カバーを設け、かつ、該保護カバーの上面に、
使用する用紙サイズ毎に、その用紙幅方向の両端部を支
持する一対のリブを設け、該リブを用紙サイズが大きく
なるに従い順次高くするようにしたことを特徴とする画
像形成装置。1. An upper conveyance type image forming apparatus in which an optical writing unit is provided on the lower side of a photoconductor and a transfer unit and a sheet conveyance path are arranged on the upper side, and one end of a link is attached to the front and rear positions of both side end portions. The other end of the link is attached to an immovable member such as an apparatus housing, and bends in conjunction with the opening / closing operation of the upper structure formed in the apparatus body. When the upper structure opens, the link extends and extends. A protective cover is provided which covers the exposed portion of the body, retracts from the exposed portion of the photoconductor when the upper structure is closed, exposes the exposed portion, and guides the paper, and the upper surface of the protective cover. To
An image forming apparatus characterized in that a pair of ribs for supporting both end portions in the paper width direction are provided for each paper size to be used, and the ribs are sequentially raised as the paper size increases.
手段の手前側に位置させ、前記保護カバーの上面を用紙
の定着入り口ガイドとしたことを特徴とする請求項1記
載の画像形成装置。2. The image forming apparatus according to claim 1, wherein the retreat is located on the rear side of the transfer means and on the front side of the fixing means, and the upper surface of the protective cover serves as a fixing entrance guide for the sheet. apparatus.
せ、前記保護カバーの上面を用紙の転写入り口ガイドと
したことを特徴とする請求項1記載の画像形成装置。3. The image forming apparatus according to claim 1, wherein the retreat is located on the front side of the transfer unit, and the upper surface of the protective cover serves as a transfer entrance guide for paper.
に転写手段及び用紙の搬送路を配設した上搬送型の画像
形成装置において、 両側端部の前後位置にリンクの一端が取付けられ、該リ
ンクの他端が装置筐体等の不動部材に取付けられて、装
置本体に形成した上構造体の開閉動作に連動して屈曲動
作し、該上構造体が開くと延びて前記感光体の露出部を
蔽い、該上構造体が閉じると前記感光体の露出部から退
避して、当該露出部を露出させると共に用紙のガイドを
する保護カバーを設け、かつ、該保護カバーの上面に用
紙搬送方向に沿って、該用紙幅方向の中央から外側へ向
かって順次高くなるリブを設けたことを特徴とする画像
形成装置。4. An upper conveyance type image forming apparatus having an optical writing unit on the lower side of a photosensitive member and a transfer unit and a sheet conveying path on the upper side, wherein one end of a link is attached to the front and rear positions of both side end portions. The other end of the link is attached to an immovable member such as an apparatus housing, and bends in conjunction with the opening / closing operation of the upper structure formed in the apparatus body. When the upper structure opens, the link extends and extends. A protective cover is provided which covers the exposed portion of the body, retracts from the exposed portion of the photoconductor when the upper structure is closed, exposes the exposed portion, and guides the paper, and the upper surface of the protective cover. An image forming apparatus characterized in that a rib that is gradually increased from the center in the paper width direction to the outside is provided along the paper conveyance direction.
手段の手前側に位置させ、前記保護カバーの上面を用紙
の定着入り口ガイドとしたことを特徴とする請求項4記
載の画像形成装置。5. The image forming apparatus according to claim 4, wherein the retreat is located on the rear side of the transfer means and on the front side of the fixing means, and the upper surface of the protective cover serves as a fixing entrance guide for the sheet. apparatus.
せ、前記保護カバーの上面を用紙の転写入り口ガイドと
したことを特徴とする請求項4記載の画像形成装置。6. The image forming apparatus according to claim 4, wherein the retreat is located on the front side of the transfer unit, and the upper surface of the protective cover serves as a transfer entrance guide for the sheet.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26813394A JP3485362B2 (en) | 1994-10-07 | 1994-10-07 | Image forming device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26813394A JP3485362B2 (en) | 1994-10-07 | 1994-10-07 | Image forming device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08110665A JPH08110665A (en) | 1996-04-30 |
JP3485362B2 true JP3485362B2 (en) | 2004-01-13 |
Family
ID=17454354
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP26813394A Expired - Fee Related JP3485362B2 (en) | 1994-10-07 | 1994-10-07 | Image forming device |
Country Status (1)
Country | Link |
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JP (1) | JP3485362B2 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4657682B2 (en) * | 2004-11-08 | 2011-03-23 | 京セラミタ株式会社 | Image forming apparatus |
JP2007127779A (en) * | 2005-11-02 | 2007-05-24 | Kyocera Mita Corp | Image forming device |
JP2008090042A (en) * | 2006-10-03 | 2008-04-17 | Fuji Xerox Co Ltd | Conveyance-object conveying device and image forming apparatus |
JP5673944B2 (en) * | 2011-02-28 | 2015-02-18 | セイコーエプソン株式会社 | Recording medium guide device and recording device |
JP5785919B2 (en) | 2012-08-27 | 2015-09-30 | 株式会社沖データ | Image forming apparatus |
JP6083332B2 (en) | 2013-06-21 | 2017-02-22 | ブラザー工業株式会社 | Image forming apparatus |
JP6075318B2 (en) | 2014-03-28 | 2017-02-08 | ブラザー工業株式会社 | Image forming apparatus |
JP6128035B2 (en) | 2014-03-28 | 2017-05-17 | ブラザー工業株式会社 | Image forming apparatus |
-
1994
- 1994-10-07 JP JP26813394A patent/JP3485362B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH08110665A (en) | 1996-04-30 |
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