JPS63291073A - Electrophotographic printer - Google Patents
Electrophotographic printerInfo
- Publication number
- JPS63291073A JPS63291073A JP62125883A JP12588387A JPS63291073A JP S63291073 A JPS63291073 A JP S63291073A JP 62125883 A JP62125883 A JP 62125883A JP 12588387 A JP12588387 A JP 12588387A JP S63291073 A JPS63291073 A JP S63291073A
- Authority
- JP
- Japan
- Prior art keywords
- paper
- transfer
- cover
- width
- transfer paper
- 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
- 108091008695 photoreceptors Proteins 0.000 claims description 41
- 238000001514 detection method Methods 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims 1
- 238000003780 insertion Methods 0.000 abstract 5
- 230000037431 insertion Effects 0.000 abstract 5
- 238000007786 electrostatic charging Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 24
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 239000005041 Mylar™ Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Landscapes
- Paper Feeding For Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は電子写真プリンタに係り、特に、封筒等のよう
に感光体の幅に対して転写紙の幅が短かいものが給紙さ
れた場合に、転写用帯電器による感光体への逆チャージ
あるいは過剰帯電を防止することを図った電子写真プリ
ンタに関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrophotographic printer, and particularly to an electrophotographic printer that is fed with a transfer paper whose width is shorter than the width of a photoreceptor, such as an envelope. The present invention relates to an electrophotographic printer that prevents reverse charging or excessive charging of a photoreceptor by a transfer charger.
従来技術を第６図、第７図、第８図により説明する。第
６図は従来の電子写真プリンタの縦断面図であり、まず
、この第６図により従来の印字プロセスについて説明す
る。電子写真プロセスは、感光帯６の周囲に、感光体６
を帯電させるメイン帯電器７、帯電した感光体６をレー
ザビーム、発光ダイオード等で露光するための露光源２
３、この露光によりできる静電潜像を現像してトナー像
とする現像器８．転写紙１０ヘトナー像を転写する転写
用帯電器９、転写後も感光体６上に残留している１〜ナ
ーを除去するクリーナ装置１５、感光体６上の静電潜像
を消去するイレーズランプ１６を配置して行われる。The prior art will be explained with reference to FIGS. 6, 7, and 8. FIG. 6 is a vertical cross-sectional view of a conventional electrophotographic printer. First, the conventional printing process will be explained with reference to FIG. In the electrophotographic process, a photoreceptor 6 is placed around the photosensitive zone 6.
A main charger 7 for charging the photoreceptor 6, an exposure source 2 for exposing the charged photoreceptor 6 to a laser beam, a light emitting diode, etc.
3. A developing device that develops the electrostatic latent image formed by this exposure into a toner image 8. A transfer charger 9 that transfers the toner image to the transfer paper 10, a cleaner device 15 that removes toner remaining on the photoreceptor 6 even after transfer, and an erase lamp that erases the electrostatic latent image on the photoreceptor 6. This is done by arranging 16.
転写紙１０は、電子写真プリンタ１の側面に配置された
給紙トレイ１７、あるいは給紙カセット（図示せず）に
収容され、ピックアップローラ１８で一枚ずつ分離され
てレジストローラ１９゜１９′へ送紙される。手差し給
紙の場合は、手差し給紙用トレイ４上の紙ガイ１（３に
沿って転写紙を挿入し、手差し給紙検知器２の動作によ
り手差し給紙ローラ５，５′を回転させ、転写紙をレジ
ストローラ１９，１９’へ送紙する。The transfer paper 10 is stored in a paper feed tray 17 placed on the side of the electrophotographic printer 1 or in a paper feed cassette (not shown), separated one by one by a pickup roller 18, and transferred to registration rollers 19° and 19'. Paper is sent. In the case of manual paper feed, insert the transfer paper along the paper guide 1 (3) on the manual paper feed tray 4, rotate the manual paper feed rollers 5, 5' by the operation of the manual paper feed detector 2, Transfer paper is sent to registration rollers 19, 19'.
一方、感光体６は、印字プロセスにより、まずメイン帯
電器７が動作して感光体６の表面を帯電させ、次に、こ
の感光体６の帯電した領域を露光源２３により露光して
静電潜像を形成し、現像器８でトナー現像して可視像を
形成し、レジストローラ１９，１９’により電子写真プ
ロセスの頭出しと同期して送紙させた転写紙１０に転写
用帯電器９を動作させてトナーを転写する。トナー像を
転写された転写紙１ｏは、感光体６から分離（分離手段
は図示させていない）され転写紙搬送ガイド１１により
搬送され、定着器２０に送られる。On the other hand, in the printing process, the main charger 7 first operates to charge the surface of the photoreceptor 6, and then the charged area of the photoreceptor 6 is exposed to light by the exposure source 23 to charge the electrostatic charge. A latent image is formed, a visible image is formed by toner development in the developer 8, and a transfer charger is applied to the transfer paper 10, which is fed by registration rollers 19, 19' in synchronization with the beginning of the electrophotographic process. 9 to transfer the toner. The transfer paper 1o on which the toner image has been transferred is separated from the photoreceptor 6 (separation means is not shown), conveyed by a transfer paper conveyance guide 11, and sent to a fixing device 20.
定着器２０で熱定着された転写紙１０は、排紙ローラ２
１，２１’ により排紙トレイ２２に排紙される。The transfer paper 10 that has been thermally fixed by the fixing device 20 is transferred to the paper ejection roller 2.
1 and 21', the paper is ejected to the paper ejection tray 22.
次に、第７図及び第８図により現像方式について説明す
る。第７図は、正規現像方式の説明図である。メイン帯
電器７で感光体６の表面を一様に帯電（第７図では負に
帯電させているが、正に帯電させても良い。その場合は
、負トナーを使用する）させ、露光により光の当った部
分の電荷を零にする。現像器８により正に帯電されたト
ナーが、露光されなかった部分に付着し、転写部の所で
転写紙の裏から転写用帯電器９からの負のコロナにより
感光体表面上の正のトナーを転写紙に転写する。このよ
うに、正規現像方式では、メイン帯電器７と転写用帯電
器９の帯電極性は同一である。Next, the developing method will be explained with reference to FIGS. 7 and 8. FIG. 7 is an explanatory diagram of the regular development method. The surface of the photoconductor 6 is uniformly charged with the main charger 7 (it is negatively charged in FIG. 7, but it may be positively charged. In that case, negative toner is used), and by exposure The charge on the area hit by the light is reduced to zero. The toner positively charged by the developing device 8 adheres to the unexposed area, and at the transfer section, the positive toner on the surface of the photoreceptor is generated by the negative corona from the transfer charger 9 from the back of the transfer paper. Transfer to transfer paper. In this manner, in the regular development method, the main charger 7 and the transfer charger 9 have the same charging polarity.
第８図に、反転現像方式を示す。メイン帯電器７で感光
体６の表面を一様に帯電（第８図では負に帯電させてい
るが、正に帯電させても良い。その場合は正トナーを使
用する）させ、露光により光の当った部分の電荷を零に
する。現像器８により負に帯電されたトナーが露光部に
付着し、転写部の所で転写紙１０の裏から転写用帯電器
９により与えられる正のコロナにより、感光体表面上の
負のトナーを転写紙１０に転写する。このように、反転
現像方式では、メイン帯電器７と転写用帯電器９の帯電
極性は逆になる。FIG. 8 shows a reversal development system. The main charger 7 uniformly charges the surface of the photoreceptor 6 (it is negatively charged in FIG. 8, but it may also be positively charged. In that case, positive toner is used), and it is exposed to light. The electric charge of the part hit by becomes zero. The toner negatively charged by the developing device 8 adheres to the exposed area, and at the transfer area, the negative toner on the surface of the photoreceptor is removed by the positive corona applied from the back side of the transfer paper 10 by the transfer charger 9. Transfer to transfer paper 10. In this way, in the reversal development system, the charging polarities of the main charger 7 and the transfer charger 9 are opposite.
上述のように、反転現像方式では、感光体６が転写用帯
電器９によりメイン帯電器７の帯電極性とは逆に帯電さ
れるので、特に封筒等のように感光体６の幅よりも短か
い幅の転写紙の場合、転写紙１０が無い領域の感光体表
面上に転写コロナがかかり、感光体６に電気的ストレス
を生じさせていた。また、正規現像方式では、感光体６
が転写用帯電器９により、メイン帯電器７と同極性に帯
電されるので、過剰帯電となり、これまた感光体６に電
気的ストレスを生じさせていた。As mentioned above, in the reversal development method, the photoreceptor 6 is charged by the transfer charger 9 with the charging polarity opposite to that of the main charger 7. In the case of a transfer paper having a width of 100 mm, a transfer corona is applied to the surface of the photoreceptor in an area where the transfer paper 10 is not present, causing electrical stress on the photoreceptor 6. In addition, in the regular development method, the photoreceptor 6
is charged by the transfer charger 9 to the same polarity as the main charger 7, resulting in excessive charging, which also causes electrical stress on the photoreceptor 6.
これを問題にした先行技術として特開昭５９−１４３１
６７号がある。そこでは、コロナ放電器のシールド部材
を転写材進入側から転写材進行方向に庇状に突設させる
構成にはなっているが、封筒のように幅が感光体の幅よ
り短かい場合に、検知した紙幅に応じて、転写用帯電器
上のカバーを移動制御することで感光体を転写コロナか
ら遮へいするというようには構成されていなかった。Japanese Patent Application Laid-Open No. 59-1431 is a prior art that addresses this issue.
There is No. 67. In this system, the shield member of the corona discharger is configured to protrude like an eave from the transfer material entry side in the transfer material advancing direction, but when the width is shorter than the width of the photoreceptor, such as an envelope, The structure was not such that the photoreceptor was shielded from the transfer corona by controlling the movement of the cover on the transfer charger according to the detected paper width.
〔発明が解決しようとする問題点〕
従来装置において、メイン帯電器と転写用帯電器は感光
体に対向して配置され、さらに、現像方式により、正規
現像方式では同極性により帯電を、反転現像方式では異
極性に帯電させて現像を行っていた。このために、感光
体幅に対して紙幅が短かい封筒に印字を行うと、転写紙
が無い所には、反転現像方式の場合、メイン帯電器によ
る帯電と逆極性の転写コロナが感光体にのってしまうた
めに、また、正規現像方式の場合、同極性の帯電である
ことから感光体が過剰帯電してしまうために、感光体に
ストレスを生じさせ、感光体の寿命を短縮させてしまう
という問題があった。[Problems to be Solved by the Invention] In the conventional device, the main charger and the transfer charger are arranged opposite to the photoreceptor, and furthermore, depending on the development method, charging is carried out with the same polarity in the normal development method, and in reverse development. In this method, development was performed by charging to different polarities. For this reason, when printing on an envelope whose paper width is shorter than the width of the photoconductor, in the case of a reversal development method, a transfer corona with the opposite polarity to the charging by the main charger will be applied to the photoconductor where there is no transfer paper. In addition, in the case of the regular development method, the photoconductor becomes overcharged because the charges are of the same polarity, causing stress on the photoconductor and shortening the life of the photoconductor. There was a problem with putting it away.
本発明の目的は、封筒等のように感光体の幅に対して紙
幅が短かい転写紙が給紙された時に、感光体の逆チャー
ジあるいは過剰帯電を防止することができ、感光体への
転写によるストレスを与えない電子写真プリンタを提供
することにある。An object of the present invention is to prevent reverse charging or excessive charging of the photoreceptor when a transfer paper whose paper width is shorter than the width of the photoreceptor, such as an envelope, is fed. An object of the present invention is to provide an electrophotographic printer that does not cause stress due to transfer.
上記目的は、転写用帯電器に、その感光体表面に対向す
る側の面上を遮へい可能に移動するカバーを設け、転写
紙の紙幅を検知している紙幅検知手段により検知された
紙幅に応じて上記カバーを移動制御して転写紙不在部分
を遮へいするシーケンス制御手段を備えた構成とするこ
とにより、達成される。The above purpose is to provide the transfer charger with a cover that moves in a shielding manner on the surface facing the photoreceptor surface, and to respond to the paper width detected by the paper width detection means that detects the paper width of the transfer paper. This is achieved by providing a sequence control means for controlling the movement of the cover to cover the area where the transfer paper is absent.
手差し給紙の場合、紙幅検知器が転写紙の紙幅を検知し
、検知した紙幅が感光体幅よりも短かい封筒等の場合、
シーケンス制御部が転写用帯電器カバーを移動させるよ
うに制御して、転写紙不在の転写用帯電器面上部分を遮
へいする。これにより、転写コロナによる感光体への逆
チャージあるいは過剰帯電が防止され、感光体の長寿命
化の実現が可能となる。In the case of manual paper feeding, the paper width detector detects the paper width of the transfer paper, and if the detected paper width is shorter than the photoconductor width, such as an envelope,
The sequence control unit controls the transfer charger cover to move to shield the upper portion of the transfer charger surface where no transfer paper is present. This prevents reverse charging or excessive charging of the photoreceptor due to transfer corona, making it possible to extend the life of the photoreceptor.
カセット給紙の場合は、印字プロセスの起動によりピッ
クアップローラが回り、カセッＩ・内に収納された転写
紙が一枚ずつピックアップされて給紙トレイからレジス
トローラに送られる。この場合は、各カセットごとにそ
れぞれ、同一サイズの転写紙が収納されており、各カセ
ットサイズと、それぞれに収納されている転写紙の紙幅
との関係は前もって判明しているので、カセットサイズ
を検知することで、転写紙の紙幅を認知することができ
る。したがって、手差し給紙の場合の紙幅検知器に代え
てカセットサイズ検知器の出力をシーケンス制御部に与
えることで、前記手差し給紙の場合と同じようにカバー
を移動制御させ、遮へい動作を行わせることができる。In the case of paper feeding from a cassette, a pickup roller rotates when the printing process is started, and the transfer paper stored in the cassette I is picked up one by one and sent from the paper feed tray to the registration roller. In this case, each cassette stores transfer paper of the same size, and the relationship between each cassette size and the paper width of the transfer paper stored in each is known in advance, so the cassette size can be adjusted. By detecting this, the paper width of the transfer paper can be recognized. Therefore, by supplying the output of the cassette size detector to the sequence control unit instead of the paper width detector in the case of manual paper feeding, the movement of the cover is controlled and the shielding operation is performed in the same way as in the case of manual paper feeding. be able to.
以下、本発明の一実施例を第１図〜第５図により説明す
る。第１図は実施例の電子写真プリンタ全体の縦断面図
であり、第２図は本発明が特に係る転写用帯電器カバー
（以下、単にカバーと呼ぶ）を示す図である。現像方式
は、正規現像方式でも、反転現像方式でもよい。第２図
において、３２はカバーソレノイドであり、マイラ等の
絶縁物３１を貼りつけた金属性のカバー３０は、転写用
帯電器９の上方において、矢印Ａの向きに、あるいは矢
印Ａ′の向きに移動させる働きをする。なお、本実施例
ではソレノイドを使用したが、カバー３０を矢印Ａ、Ａ
’の向きに動かす機構であれば、他のものでもよい。ま
た、カバー３０をＡ、Ａ’力方向直角方向に、即ち転写
用帯電器９の長さ方向に、移動させてカバー位置を変え
る方式でもよい。An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. FIG. 1 is a vertical cross-sectional view of the entire electrophotographic printer of the embodiment, and FIG. 2 is a diagram showing a transfer charger cover (hereinafter simply referred to as a cover) to which the present invention particularly relates. The development method may be a regular development method or a reversal development method. In FIG. 2, 32 is a cover solenoid, and a metal cover 30 to which an insulating material 31 such as Mylar is pasted is placed above the transfer charger 9 in the direction of arrow A or in the direction of arrow A'. It functions to move the Although a solenoid was used in this embodiment, the cover 30 is
Any other mechanism may be used as long as it moves in the direction of '. Alternatively, the cover position may be changed by moving the cover 30 in a direction perpendicular to the force directions A and A', that is, in the length direction of the transfer charger 9.
第３図は、手差し給紙により封筒等の転写紙１０を給紙
する場合の説明図である。一点鎖線は転写紙の移動軌跡
を示す。手差し給紙の場合は、給紙された転写紙１０に
より、手差し給紙検知器２が動作し、次に紙幅検知器３
３が動作する。この第３図の場合は、紙幅検知器３３が
検知していないので、転写紙は封筒等であるということ
になり、カバー３０が、転写用帯電器９の転写紙のない
部分を遮へいする。FIG. 3 is an explanatory diagram when feeding the transfer paper 10, such as an envelope, by manual paper feeding. The dashed line indicates the movement locus of the transfer paper. In the case of manual paper feeding, the fed transfer paper 10 activates the manual paper feed detector 2, and then the paper width detector 3 operates.
3 works. In the case of FIG. 3, since the paper width detector 33 has not detected the transfer paper, it is assumed that the transfer paper is an envelope or the like, and the cover 30 shields the portion of the transfer charger 9 where there is no transfer paper.
第４図は、手差し給紙により通常の、感光体幅に近い紙
幅をもった、転写紙を通紙した場合の説明図である。こ
の場合は、手差し給紙検知器２が動作し、次に紙幅検知
器３３が、紙幅があることを検知して、通常の転写紙と
いうことになり、カバー３０は矢印Ａ’ （第２図参
照）の向きに動かされ、転写用帯電器９の遮へいを開瞼
する。FIG. 4 is an explanatory diagram when a normal transfer sheet having a width close to the width of the photoconductor is passed through by manual paper feeding. In this case, the manual paper feed detector 2 operates, and then the paper width detector 33 detects that there is a paper width, and it is determined that the paper is normal transfer paper. ), and the shield of the transfer charger 9 is opened.
以上の構成において、印字プロセスについて説明する。In the above configuration, the printing process will be explained.
まず、第３図と、本発明の制御系統のブロック図を示す
第５図とにより、手差しによる封筒等（感光体６の幅に
対し転写紙１０の幅が約１／２であるような場合）の給
紙について述べる。First, referring to FIG. 3 and FIG. 5 showing a block diagram of the control system of the present invention, it is clear that an envelope, etc. that is manually fed (in the case where the width of the transfer paper 10 is approximately 1/2 of the width of the photoreceptor 6) is shown in FIG. ) paper feeding.
手差し給紙トレイ４（第１図参照）上の紙ガイド３に沿
って転写紙１０を挿入すると、手差し給紙検知器２が動
作し、手差し給紙ローラ５，５′を回転させ、レジスト
ローラ１９，１９’ まで転写紙１０を送紙する。この
時、紙幅検知器３３は動作しないので、シーケンス制御
部（第５図）はカバーソレノイド３２を動作させ、転写
用帯電器９の開口部をカバー３０により遮へいする。When the transfer paper 10 is inserted along the paper guide 3 on the manual paper feed tray 4 (see Figure 1), the manual paper feed detector 2 is activated, rotates the manual paper feed rollers 5 and 5', and the registration roller The transfer paper 10 is fed to 19, 19'. At this time, since the paper width detector 33 does not operate, the sequence control section (FIG. 5) operates the cover solenoid 32 to block the opening of the transfer charger 9 with the cover 30.
また、印字プロセスにより、レジストローラ１９．１９
’で、電子写真プロセスの頭出しと同期して転写紙１０
を送紙する一方、主帯電器７で帯電させられた感光体６
を露光源２３で露光し、現像器８で静電潜像をトナーに
より可視像とし、転写用帯電器９で感光体６上のトナー
を転写紙１０に転写する。Also, due to the printing process, the registration roller 19.19
', the transfer paper 10 is synchronized with the beginning of the electrophotographic process.
While feeding the paper, the photoreceptor 6 charged by the main charger 7
is exposed with an exposure source 23, the electrostatic latent image is made into a visible image with toner in a developer 8, and the toner on the photoreceptor 6 is transferred onto a transfer paper 10 with a transfer charger 9.
上述したように、封筒等への印字の場合、転写紙１０の
ない部分の帯電器９の上方はカバー３０で遮へいされる
ので、転写コロナが感光体６にかかるのを防止でき、前
述した電気的なストレスが生じない。また、転写紙を連
続通紙する場合も、印字シーケンスを転写紙が転写用帯
電器上を通る時だけ転写コロナを印加するように組むの
で、転写紙間の隙間により感光体が逆帯電したり、過剰
帯電したりするのを防げる。As mentioned above, when printing on an envelope or the like, the area above the charger 9 where there is no transfer paper 10 is shielded by the cover 30, which prevents the transfer corona from being applied to the photoreceptor 6, and prevents the above-mentioned electricity. No stress will occur. In addition, even when the transfer paper is continuously passed through, the printing sequence is set so that the transfer corona is applied only when the transfer paper passes over the transfer charger, so the photoreceptor is not charged in the opposite direction due to the gap between the transfer papers. , prevents excessive charging.
次に、第４図と第５図により、手差し給紙により通常の
転写紙に印字する場合について述べる。Next, referring to FIGS. 4 and 5, a case will be described in which printing is performed on ordinary transfer paper by manual paper feeding.
手差し給紙トレイ４上の紙ガイド３に沿って転写紙１０
を挿入すると、手差し給紙検知器２が動作し、手差し給
紙ローラ５，５′を回転させて、レジストローラ１９，
１９’ まで転写紙１０を送紙する。この時、紙幅検知
器３３が検知するので、第５図のシーケンス制御部は、
カバーソレノイド３０を動作させない。このため、転写
用帯電器９は、第４＠に示すように、カバー３０によっ
て遮へいされないので、転写コロナはこの通常の転写紙
１０の幅全域にかかり、トナーを転写紙１０に転写する
。Transfer paper 10 is placed along the paper guide 3 on the manual paper feed tray 4.
When inserted, the manual paper feed detector 2 operates, rotates the manual paper feed rollers 5, 5', and registers the registration rollers 19, 5'.
The transfer paper 10 is fed up to 19'. At this time, the paper width detector 33 detects this, so the sequence control section in FIG.
Do not operate the cover solenoid 30. Therefore, as shown in the fourth @, the transfer charger 9 is not shielded by the cover 30, so the transfer corona is applied to the entire width of the normal transfer paper 10, and the toner is transferred to the transfer paper 10.
さらに、カセット給紙の場合について、第５図により説
明する。カセット給紙の場合は、カセッ１〜内に収納さ
れている転写紙の紙幅と、カセットサイズとの関係はあ
らかじめ判明しているので、カセットサイズ検知器によ
り検知させたカセットサイズを入力に受けて、シーケン
ス制御部は転写紙の紙幅を知ることができる。そこで、
この紙幅に応じて、カバー３０で転写用帯電器９を遮へ
いしたり、または遮へいしないように制御する。Furthermore, the case of paper feeding from a cassette will be explained with reference to FIG. In the case of cassette paper feeding, the relationship between the paper width of the transfer paper stored in cassettes 1 to 1 and the cassette size is known in advance, so the cassette size detected by the cassette size detector is input. , the sequence control unit can know the paper width of the transfer paper. Therefore,
Depending on the paper width, the cover 30 is controlled to block the transfer charger 9 or not to block it.
本実施例では、紙幅検知器３３、転写用帯電器カバー３
０及びこのカバーを動かすカバーソレノイド３２を、各
々、１個としたが、これに限定されるものではなく、２
個以上としてもよい。即ち、手差し給紙の場合は、ｎ個
の紙幅検知器３３のうち、紙を検知していない紙幅検知
器３３に対応するカバーソレノイド３２を駆動し、転写
用帯電器９を遮へいするようにして転写コロナが感光体
６にかからないようにすればよい。カセット給紙の場合
は、前述したように、紙サイズを知ることができるので
、カセツ１〜内の転写紙の紙幅にあわせてカバーソレノ
イド３２を動作させればよい。さらに、本実施例では、
第３図及び第４図に示すように、転写紙１０の左端を基
準にして通紙しているが、これに限定される必要はなく
、転写紙１０、感光体６等の中央を基準としてもよい。In this embodiment, a paper width detector 33, a transfer charger cover 3
0 and the number of cover solenoids 32 that move this cover are one each, but the number is not limited to this, and two
It may be more than one. That is, in the case of manual paper feeding, the cover solenoid 32 corresponding to the paper width detector 33 that is not detecting paper among the n paper width detectors 33 is driven to shield the transfer charger 9. It is only necessary to prevent the transfer corona from coming into contact with the photoreceptor 6. In the case of paper feeding from a cassette, since the paper size can be known as described above, the cover solenoid 32 can be operated in accordance with the paper width of the transfer paper in the cassettes 1 to 1. Furthermore, in this example,
As shown in FIGS. 3 and 4, the paper is passed with the left end of the transfer paper 10 as a reference, but there is no need to be limited to this, and the center of the transfer paper 10, photoreceptor 6, etc. is used as a reference. Good too.
この場合は、封筒のような転写紙は感光体の中央を通る
ことになる。In this case, the envelope-like transfer paper passes through the center of the photoreceptor.
本実施例によれば、カセット又は手差し給紙の場合、転
写紙１０の紙幅を知って、転写用帯電器の転写紙がない
部分にカバーを出す方式であるので、反転現像方式にお
いては感光体６の転写用帯電器９による逆帯電が防止で
き、正規現像方式の場合は、感光体６の転写用帯電器９
による過剰帯電が防止でき、これにより、感光体６の電
気的ス１−レスがなくなり、感光体６の長寿命化が実現
可能となる。According to this embodiment, in the case of a cassette or manual paper feed, the paper width of the transfer paper 10 is known and the cover is extended to the portion of the transfer charger where there is no transfer paper. Reverse charging by the transfer charger 9 of the photoreceptor 6 can be prevented, and in the case of a regular development method, the transfer charger 9 of the photoreceptor 6 can be prevented.
As a result, the photoreceptor 6 is free from electrical stress, and the life of the photoreceptor 6 can be extended.
本発明によれば、感光体の幅よりも短かい紙幅をもつ転
写紙（例えば、封筒）を給紙した場合、紙幅を紙幅検知
器で検知し、検知した紙幅に対応してカバーソレノイド
を動作させて、転写紙のない部分をカバーで遮へいする
構成としたことによ（Ｊ４）
リ、感光体の転写用帯電器により逆帯電や過剰帯電がな
くなり、このため、感光体６に電気ストレスがかからず
、感光体の長寿命化が可能となる。According to the present invention, when a transfer paper (for example, an envelope) having a paper width shorter than the width of the photoreceptor is fed, the paper width is detected by a paper width detector, and the cover solenoid is operated in accordance with the detected paper width. By shielding the area without transfer paper with a cover (J4), reverse charging and excessive charging are eliminated by the transfer charger of the photoconductor, which reduces electrical stress on the photoconductor 6. This makes it possible to extend the life of the photoreceptor.
第１図は本発明の一実施例の縦断面図、第２図は本発明
が特に係る転写用帯電器カバーの一実施例の断面図、第
３図は封筒等の幅の短かい転写紙の場合の説明図、第４
図は通常幅の転写紙の場合の説明図、第５図は本発明の
制御系統のブロック図、第６図は従来の印字プリンタの
縦断面図、第７図は正規現像方式の説明図、第８図は反
転現像方式の説明図である。
２ ・手差し給紙検知器、６・・感光体、７・・・主帯
電器、９・・・転写用帯電器、１０・・・転写紙、３０
・転招 ？ 図
ｑ
９・・・奉を幕用等′電駕２
３０・・・卓２二ＴＱ弓１！ト電１４鷺、カッ＼−３１
・・ 壮特拘
３２８．カバーソしノイド
箔 ３Ｉ２１
３２ ・・・力へ−ソＬ′イト ３３・・・撃へ
中晶柱笈０ス、第 ４ 口
％ ５ 図FIG. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, FIG. 2 is a cross-sectional view of an embodiment of a transfer charger cover to which the present invention particularly relates, and FIG. 3 is a short-width transfer paper such as an envelope. Explanatory diagram for the case, 4th
5 is a block diagram of the control system of the present invention, FIG. 6 is a vertical cross-sectional view of a conventional printing printer, and FIG. 7 is an explanatory diagram of the regular development method. FIG. 8 is an explanatory diagram of the reversal development method. 2 - Manual paper feed detector, 6... Photoconductor, 7... Main charger, 9... Transfer charger, 10... Transfer paper, 30
・Transfer? Figure q 9...Beginning for the curtain, etc.'Electronic bridge 2 30...Table 22 TQ bow 1! Toden 14 Sagi, Kak＼-31
... Sotoku-kun 328. Cover solenoid foil 3I21 32 ...Force - SoL'ite 33 ...Force to middle crystal pillar 0s, 4th opening% 5 Fig.
Claims (1)
動的に検知する紙幅検知手段と、感光体表面から転写紙
へトナー像を転写する転写用帯電器とを具備する電子写
真プリンタにおいて、上記転写用帯電器の上記感光体表
面に対向する側の面上を遮へい可能に移動する転写用帯
電器カバーを設け、上記紙幅検知手段で検知された紙幅
に応じて上記カバーを移動制御して上記転写用帯電器の
転写紙不在部分を遮へいする制御手段を備えたことを特
徴とする電子写真プリンタ。 ２、前記ローラ手段が、転写紙を手差しで給紙する手差
し給紙ローラであることを特徴とする特許請求の範囲第
１項記載の電子写真プリンタ。 ３、前記ローラ手段が、カセット内に収納された同一サ
イズの多数の転写紙を一枚ごとにピックアップして給紙
するピックアップローラであり、前記紙幅検知手段が、
カセットサイズを検知して紙幅を認知するカセットサイ
ズ検知器であることを特徴とする特許請求の範囲第１項
記載の電子写真プリンタ。 ４、前記転写用帯電器カバーが、導電性材料に絶縁物層
を接着して形成されていることを特徴とする特許請求の
範囲第１項、第２項、第３項のいずれかに記載の電子写
真プリンタ。[Claims] 1. A roller means for feeding the transfer paper, a paper width detection means for automatically detecting the paper width of the transfer paper, and a transfer charger for transferring the toner image from the surface of the photoreceptor to the transfer paper. In the electrophotographic printer, a transfer charger cover is provided that moves in a shielded manner on the surface of the transfer charger facing the photoconductor surface, and the transfer charger cover is configured to cover a transfer charger cover that moves in a shielded manner on a surface of the transfer charger that is opposite to the photoconductor surface, and An electrophotographic printer, comprising control means for controlling the movement of the cover to block a portion of the transfer charger where no transfer paper is present. 2. The electrophotographic printer according to claim 1, wherein the roller means is a manual paper feed roller that manually feeds the transfer paper. 3. The roller means is a pickup roller that picks up and feeds a large number of transfer papers of the same size stored in a cassette one by one, and the paper width detection means includes:
The electrophotographic printer according to claim 1, characterized in that it is a cassette size detector that detects the cassette size and recognizes the paper width. 4. The transfer charger cover is formed by adhering an insulating layer to a conductive material, according to any one of claims 1, 2, and 3. electronic photo printer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62125883A JPS63291073A (en) | 1987-05-25 | 1987-05-25 | Electrophotographic printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62125883A JPS63291073A (en) | 1987-05-25 | 1987-05-25 | Electrophotographic printer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63291073A true JPS63291073A (en) | 1988-11-28 |
Family
ID=14921282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62125883A Pending JPS63291073A (en) | 1987-05-25 | 1987-05-25 | Electrophotographic printer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63291073A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5455664A (en) * | 1992-05-27 | 1995-10-03 | Oki Electric Industry Co., Ltd. | Electrophotographic printer for transferring images on different sized print medium and transferring method of the same |
-
1987
- 1987-05-25 JP JP62125883A patent/JPS63291073A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5455664A (en) * | 1992-05-27 | 1995-10-03 | Oki Electric Industry Co., Ltd. | Electrophotographic printer for transferring images on different sized print medium and transferring method of the same |
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