JPH0553405A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH0553405A JPH0553405A JP3213438A JP21343891A JPH0553405A JP H0553405 A JPH0553405 A JP H0553405A JP 3213438 A JP3213438 A JP 3213438A JP 21343891 A JP21343891 A JP 21343891A JP H0553405 A JPH0553405 A JP H0553405A
- Authority
- JP
- Japan
- Prior art keywords
- image forming
- recording material
- image
- abnormality
- carrier
- 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.)
- Withdrawn
Links
Landscapes
- Dot-Matrix Printers And Others (AREA)
- Laser Beam Printer (AREA)
- Paper Feeding For Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
- Color Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は画像形成装置、特に像担
持体の周囲に画像形成手段を有する画像形成ステーショ
ンを備えた画像形成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 forming apparatus, and more particularly to an image forming apparatus provided with an image forming station having an image forming means around an image carrier.
【０００２】[0002]
【従来の技術】図３に、画像形成ステーションおよび記
録材搬送体を有する従来のこの種の画像形成装置の一例
としてフルカラー式４ドラム形レーザビームプリンタの
構成概要図を示す。このプリンタは、電子写真感光体で
ある像担持体の周囲に画像形成手段を有して構成される
画像形成ステーションが４個直列に設けられ、これら各
画像形成ステーションにおいて形成された像担持体上の
画像が、この像担持体に隣接して移動通過する移動体
に、担持し搬送される記録材に転写されるよう構成され
ている。2. Description of the Related Art FIG. 3 is a schematic diagram showing the construction of a full-color 4-drum laser beam printer as an example of a conventional image forming apparatus of this type having an image forming station and a recording material conveying body. In this printer, four image forming stations each having an image forming unit are provided in series around an image carrier, which is an electrophotographic photosensitive member, and the image carrier formed on each of the image forming stations is formed on the image carrier. Image is transferred onto a recording material carried and conveyed by a moving body which moves and passes adjacent to the image carrying body.
【０００３】マゼンタ，シアン，イエロー，ブラックの
各色用画像形成ステーションＰａ，Ｐｂ，Ｐｃ，Ｐｄ
に、それぞれ像担持体としての感光（体）ドラム１ａ，
１ｂ，１ｃ，１ｄが配置され、矢印方向に回転される。
また、各感光ドラム１ａ〜１ｄの周囲には、帯電器２
ａ，２ｂ，２ｃ，２ｄ不図示の各走査光学系装置、各現
像装置３ａ，３ｂ，３ｃ，３ｄ及び各クリーナ５ａ，５
ｂ，５ｃ，５ｄから成る各画像形成手段が配設されてい
る。さらに、画像形成手段の一つを構成する各転写部に
は、各画像形成ステーション１ａ〜１ｄに共通の搬送体
としてのエンドレス搬送ベルト８及び各転写用帯電器４
ａ，４ｂ，４ｃ，４ｄを有し、フルカラー画像の形成は
搬送ベルト８上に支持されたコピー用紙等の記録材６上
に順次前記感光ドラム１ａ〜１ｄ上に形成された各色の
トナー像を転写することによって達成するよう構成され
る。Image forming stations Pa, Pb, Pc, Pd for each color of magenta, cyan, yellow and black.
And a photosensitive (body) drum 1a as an image carrier,
1b, 1c, 1d are arranged and rotated in the arrow direction.
A charger 2 is provided around each of the photosensitive drums 1a to 1d.
a, 2b, 2c, 2d Scanning optical system devices not shown, developing devices 3a, 3b, 3c, 3d and cleaners 5a, 5
Each image forming unit composed of b, 5c and 5d is provided. Further, in each transfer section which constitutes one of the image forming means, an endless conveyor belt 8 as a conveyor common to the image forming stations 1a to 1d and each transfer charger 4 are provided.
a, 4b, 4c, 4d, for forming a full-color image, toner images of respective colors formed on the photosensitive drums 1a to 1d are sequentially formed on a recording material 6 such as copy paper supported on a conveyor belt 8. It is configured to be achieved by transferring.
【０００４】記録材６は給紙カセット６０から供給さ
れ、搬送ベルト８の搬送駆動のタイミングを制御するた
めの制御手段であるレジストローラ１３に至る。ここで
予め設定されたタイミングでレジストローラ１３が回転
駆動し、記録材６を搬送ベルト８上へ送出し、全転写工
程を終了した記録材６は分離され、定着器７を介して排
紙トレイ１５に至るよう構成されている。なお、前記不
図示の走査光学系装置は、光源であるレーザ装置と、こ
のレーザ装置を走査する回転ポリゴンミラーと、走査ビ
ームを各感光ドラム１ａ〜１ｄ表面の母線上に集光する
ためのｆθレンズと、光束を変向するための各反射ミラ
ーと、前記走査ビームの特定位置を検出するためのビー
ム検出装置とから構成されている。The recording material 6 is supplied from a paper feed cassette 60 and reaches a registration roller 13 which is a control means for controlling the timing of the conveyance drive of the conveyance belt 8. Here, the registration roller 13 is rotationally driven at a preset timing to send the recording material 6 onto the conveyor belt 8, and the recording material 6 that has undergone the entire transfer process is separated, and the recording material 6 is discharged via the fixing device 7 to the paper ejection tray. It is configured to reach 15. The scanning optical system device (not shown) is a laser device as a light source, a rotating polygon mirror for scanning the laser device, and fθ for condensing the scanning beam on the generatrix of the surface of each of the photosensitive drums 1a to 1d. It is composed of a lens, reflecting mirrors for diverting the light flux, and a beam detecting device for detecting a specific position of the scanning beam.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、以上の
ような従来例にあっては、レジストローラ１３は記録材
６を搬送ベルト１４上へ送出するときにのみ駆動される
よう構成されているため、例えば連続コピー動作中に搬
送経路上で紙詰り（ジャム）等の異常が生じた場合、画
像形成動作が停止するとともに、レジストローラ１３の
駆動も停止される。このため、レジストローラ１３の間
に記録材６が挟まれている状態で停止することもあり、
このような場合には記録材６を取除くいわゆるジャム処
理作業が極めて困難になるという問題点があった。本発
明は、以上のような従来例の問題点にかんがみてなされ
たもので、連続複写動作中に搬送経路上で例えば紙詰り
等の異常を生じたとき、そのジャム処理等の作業を容易
にするための手段の提供を目的としている。However, in the above conventional example, the registration roller 13 is configured to be driven only when the recording material 6 is sent onto the conveyor belt 14. For example, when an abnormality such as a paper jam (jam) occurs on the conveyance path during the continuous copy operation, the image forming operation is stopped and the driving of the registration rollers 13 is stopped. Therefore, the recording material 6 may be stopped while being sandwiched between the registration rollers 13,
In such a case, there is a problem that the so-called jam removing work for removing the recording material 6 becomes extremely difficult. The present invention has been made in view of the problems of the conventional example as described above, and when an abnormality such as a paper jam occurs on the transport path during the continuous copying operation, the jam processing or the like can be easily performed. The purpose is to provide means for doing so.
【０００６】[0006]
【課題を解決するための手段】このため、本発明におい
ては、無端移動する像担持体の周囲に画像形成手段を有
する任意数の画像形成ステーションと記録材を順次搬送
するための搬送体と、前記画像ステーションにおける画
像形成と前記搬送体における記録材の搬送駆動のタイミ
ングとを制御するための制御手段とを有する画像形成装
置において、前記制御手段による駆動動作を画像形成時
以外にも可能に構成し、さらにまた、前記記録材搬送状
態の検知手段を有し、この検知手段により異常を検知し
たときは、前記画像形成手段による画像形成動作を停止
し、かつ、前記制御手段による駆動動作を所定時間継続
するよう構成することにより、前記目的を達成しようと
するものである。Therefore, in the present invention, an arbitrary number of image forming stations having image forming means around an endlessly moving image carrier and a carrier for sequentially carrying a recording material, In an image forming apparatus having a control means for controlling the timing of image formation in the image station and the conveyance driving timing of the recording material in the conveyance body, the driving operation by the control means can be performed other than during image formation. Further, the recording material conveyance state detecting means is further provided, and when an abnormality is detected by the detecting means, the image forming operation by the image forming means is stopped and the driving operation by the control means is predetermined. It is intended to achieve the above object by being configured to continue for a time.
【０００７】[0007]
【作用】以上のような本発明構成によれば、本装置にお
いて連続的に複写動作中に、前記搬送経路中に例えば紙
詰り等の異常を生じたとき、画像形成動作が直ちに中止
すると共に、所定時間搬送体を継続して駆動させること
ができるため、その記録紙の取除き等の処理作業が容易
となる。According to the configuration of the present invention as described above, when an abnormality such as a paper jam occurs in the conveyance path during continuous copying operation in the apparatus, the image forming operation is immediately stopped, and Since the transport body can be continuously driven for a predetermined time, processing work such as removal of the recording paper is facilitated.
【０００８】[0008]
【実施例】以下に、本発明を実施例に基づいて説明す
る。図１に本発明に係るこの種のレーザビームプリンタ
の一実施例の構成概要図（前記図３相当図）を示し、図
３と同一（相当）構成要素は同一符号で表わし、個々の
重複説明は省略する。 （構成）図１は、前記従来例図３と同様に、画像形成ス
テーションを４個備えたフルカラー式４ドラム形レーザ
ビームプリンタで、連続コピー動作を行うときの状態を
表わした概略図である。EXAMPLES The present invention will be described below based on examples. FIG. 1 shows a schematic configuration diagram (corresponding to FIG. 3) of an embodiment of this type of laser beam printer according to the present invention. The same (corresponding) components as those in FIG. Is omitted. (Structure) FIG. 1 is a schematic diagram showing a state in which a continuous copying operation is performed in a full-color 4-drum type laser beam printer having four image forming stations, as in FIG.
【０００９】６ａ，６ｂ，６ｃ，６ｄはそれぞれ給紙カ
セット６０より送られた記録材６が、ある一定間隔をお
いて連続的に送られた状態を示す。２０ａ，２０ｂ，２
０ｃ，２０ｄ，２０ｅ，２０ｆは、それぞれ記録材６の
搬送状態を検知するための各検知手段であり、これらは
各フォトセンサにより記録材６の有無をそれぞれ検知
し、記録材６の先端がこれらフォトセンサの直下を通過
したときに記録材検知フラグに“１”のデータを書込
み、制御装置としてのＣＰＵ２１に送るよう構成されて
いる。ＣＰＵ２１においては、各記録材６が、給紙カセ
ット６０より各検知手段２０ａ〜２０ｆを正常に通過す
るそれぞれの時間ｔa ，ｔb ，ｔc ，ｔd ，ｔe ，ｔf
が予め記憶されている。Reference numerals 6a, 6b, 6c and 6d respectively show a state in which the recording material 6 fed from the paper feeding cassette 60 is continuously fed at a certain fixed interval. 20a, 20b, 2
Reference numerals 0c, 20d, 20e, and 20f are detection means for detecting the conveyance state of the recording material 6, respectively, and these photosensors detect the presence or absence of the recording material 6, respectively, and the tip of the recording material 6 detects these. It is configured to write "1" data in the recording material detection flag when the recording medium detection flag passes just below the photo sensor and send it to the CPU 21 as a control device. In the CPU 21, the time t a , t b , t c , t d , t e , t f at which the recording material 6 normally passes through the detection means 20a to 20f from the paper feed cassette 60, respectively.
Is stored in advance.
【００１０】画像形成（複写）動作が開始されると、各
画像形成ステーションＰａ〜Ｐｄ及び搬送ベルト８が駆
動されて動作し、給紙カセット６０より各記録材６ａ〜
６ｄが順次送られる。これらの記録材６ａ〜６ｄ……が
前記各検知手段２０ａ〜２０ｆの直下を通過した時間Ｔ
ａ〜Ｔｆと、予め記憶されている前記ｔa 〜ｔe との差
分Δｔa 〜Δｔf がＣＰＵ２１にて演算されるよう構成
されている。When the image forming (copying) operation is started, the image forming stations Pa to Pd and the conveyor belt 8 are driven to operate, and the recording material 6a to the recording material 6a to the sheet feeding cassette 60.
6d are sequentially sent. The time T during which these recording materials 6a to 6d pass immediately below the detection means 20a to 20f.
The CPU 21 calculates differences Δt a to Δt f between a to Tf and the previously stored ta to t e .
【００１１】（動作）以上の動作シーケンスを、図２に
示すフローチャートを用いて説明する。コピーボタンが
押されてコピーがスタートすると、ステップＳ１で各画
像形成ステーションＰａ〜Ｐｄ共通の搬送ベルト８が駆
動されて動作を開始する。ここで、給紙カセット６０よ
り供給された記録材６が、レジストローラ１３を通過し
てそれぞれ各検知手段２０ａ〜２０ｆの直下を通過した
回数をｎで表わすと、まずステップＳ２でｎ＝１、すな
わち検出手段２０ａを通過し、ステップＳ３でｎ＝ｎ＋
１、すなわち順次次の検出手段２０ｂ，２０ｃ……を通
過し、ステップＳ４でｎ＞６、すなわち最後の検出手段
２０ｆを通過した状態（Ｙｅｓ）でコピー終了とする。(Operation) The above operation sequence will be described with reference to the flowchart shown in FIG. When the copy button is pressed to start copying, the conveyor belt 8 common to the image forming stations Pa to Pd is driven to start the operation in step S1. Here, when the number of times the recording material 6 supplied from the paper feeding cassette 60 has passed through the registration roller 13 and directly under the respective detection means 20a to 20f is represented by n, first, in step S2, n = 1, That is, it passes through the detecting means 20a, and n = n + in step S3.
1 is passed, that is, the next detection means 20b, 20c ... Sequentially, and in step S4, n> 6, that is, the state where the last detection means 20f is passed (Yes), the copy is completed.
【００１２】一方、前記のように、各検知手段２０ａ〜
２０ｆの正常通過時間ｔa 〜ｔf はそれぞれ制御装置の
ＣＰＵ２１に記憶されているが、前記各ステップで各検
知手段２０ａ〜２０ｆの実際の通過時間がＣＰＵ２１に
送出されて読込まれ、ステップＳ５においてそれぞれの
差分Δｔn ＝Ｔn −ｔn の演算が行われ、ステップＳ６
においてΔｔn ＜ｘn （ここにｘn は所定の一定値）で
あれば（Ｎｏ）ステップＳ３の前に戻ってそのままコピ
ー動作を継続させてコピーの終了を待つ。On the other hand, as described above, each detecting means 20a ...
Although 20f normal transit time t a ~t f of being CPU 21 to store each control device, the thrown read rare actual transit time of each sensing means 20a~20f at each step CPU 21, in step S5 The difference Δt n = T n −t n is calculated, and step S6 is performed.
If Δt n <x n (where x n is a predetermined constant value) (No), the process returns to the step S3 to continue the copy operation and wait for the end of the copy.
【００１３】これに反して、ステップＳ６において、Δ
ｔn ≧ｘn であれば（Ｙｅｓ）、搬送異常と判断して、
ステップＳ７で各画像形成ステーションＰａ〜Ｐｄの動
作を停止させるが、このとき記録材６ａの後端はレジス
トローラ１３を通過していないので、ステップＳ８でレ
ジストローラ１３及び搬送ベルト８の動作はある時間継
続し、記録材６ａがレジストローラ１３を完全に通過す
るまで動作し、その後、ステップＳ９でレジストローラ
１３及び搬送ベルト８の動作を停止させて終了するよう
構成されている。On the contrary, in step S6, Δ
If t n ≧ x n (Yes), it is determined that the conveyance is abnormal,
In step S7, the operation of each of the image forming stations Pa to Pd is stopped. At this time, since the trailing edge of the recording material 6a has not passed the registration roller 13, the registration roller 13 and the conveyor belt 8 are operated in step S8. The recording material 6a continues for a certain period of time and operates until the recording material 6a completely passes through the registration roller 13, and thereafter, in step S9, the operations of the registration roller 13 and the conveyor belt 8 are stopped and the operation is ended.
【００１４】ジャム検知後のレジストローラ１３及び搬
送ベルト８の前記動作継続時間は少なくとも（記録材６
の長さ）／（プロセス速度）であれば良い。この間、各
転写帯電器４ａ，４ｂ，４ｃ，４ｄの動作は停止させ
て、各感光ドラム１ａ〜１ｄ上に残存する画像を転写さ
せないようにすると搬送ベルト８を汚すことはなくな
る。以上の動作により、ジャム後の記録材６はすべて搬
送ベルト８上に載置されていることになり、ジャム処理
作業が極めて容易になる。After the jam is detected, the operation duration of the registration roller 13 and the conveyor belt 8 is at least (recording material 6
Length) / (process speed). During this time, the operation of each of the transfer chargers 4a, 4b, 4c, 4d is stopped so that the image remaining on each of the photosensitive drums 1a to 1d is not transferred, so that the conveyance belt 8 is not soiled. As a result of the above operation, the recording material 6 after jamming is all placed on the conveyor belt 8, which makes jam processing extremely easy.
【００１５】（第２実施例）前記実施例と同様の方法を
用いて検知手段２０ｆ、すなわち定着器７の後部におい
てジャムを検知した場合、定着器７は、少なくとも記録
材６の長さだけ駆動させ、記録材６が排紙トレイ１５へ
排出させるようにする。また、複数枚コピーの場合に
は、前記第１実施例と同様にレジストローラ１３と搬送
ベルト８とを駆動させ、画像形成ステーションの動作は
停止させる。１枚コピーのときには、定着器７のみを駆
動させ、他は停止させることにより、前記と同様の効果
を得ることができる。(Second Embodiment) When a jam is detected in the detecting means 20f, that is, in the rear portion of the fixing device 7 by using the same method as the above-mentioned embodiment, the fixing device 7 is driven at least by the length of the recording material 6. Then, the recording material 6 is discharged to the discharge tray 15. Further, in the case of copying a plurality of sheets, the registration roller 13 and the conveyor belt 8 are driven and the operation of the image forming station is stopped as in the first embodiment. When copying one sheet, the same effect as described above can be obtained by driving only the fixing device 7 and stopping the others.
【００１６】（第３実施例）また、検知手段２０ｆでジ
ャムを検知したときには、定着器７のみ停止させ、他は
一定時間駆動させて定着器７の手前まで記録材６を搬送
させてもよい。なお、以上の各実施例は４画像形成ステ
ーションを有する４ドラム形レーザビームプリンタの事
例について説明したが、本発明原理はこれのみに限定さ
れるものでなく、これら画像形成ステーションの個数は
単数または任意の複数の場合にも適用し得ることはもち
ろんである。(Third Embodiment) Further, when a jam is detected by the detecting means 20f, only the fixing device 7 may be stopped and the rest may be driven for a certain period of time to convey the recording material 6 to the front of the fixing device 7. .. Although each of the above embodiments has been described with respect to the case of a four-drum type laser beam printer having four image forming stations, the principle of the present invention is not limited to this, and the number of these image forming stations may be one or Of course, it can be applied to any plural cases.
【００１７】[0017]
【発明の効果】以上説明したように、本発明によれば、
この種の画像形成装置における連続画像形成動作中に搬
送経路上において記録材の詰り等の異常を生じたとき、
記録材はすべて搬送体上に載置されるよう所定時間駆動
されるため、これを排除するための処理作業が極めて容
易となる。As described above, according to the present invention,
When an abnormality such as a clogging of a recording material occurs on the conveyance path during the continuous image forming operation in the image forming apparatus of this type,
Since all the recording material is driven for a predetermined time so as to be placed on the carrier, the processing work for eliminating this becomes extremely easy.
【図１】 レーザビームプリンタの一実施例の構成概要
図FIG. 1 is a schematic configuration diagram of an embodiment of a laser beam printer.
【図２】 図１の動作シーケンスフローチャートFIG. 2 is an operation sequence flowchart of FIG.
【図３】 従来の一例の図１相当図FIG. 3 is a view corresponding to FIG. 1 of a conventional example.
Ｐａ〜Ｐｄ 画像形成ステーション １ａ〜１ｄ 感光ドラム（像担持体） ６，６ａ〜６ｄ 記録材 ８ 搬送ベルト（搬送体） ２０ａ〜２０ｆ 検知手段 ２１ ＣＰＵ（制御手段） Pa to Pd Image forming station 1a to 1d Photosensitive drum (image carrier) 6,6a to 6d Recording material 8 Conveying belt (conveying body) 20a to 20f Detecting means 21 CPU (controlling means)
Claims (2)
手段を有する任意数の画像形成ステーションと、記録材
を順次搬送するための搬送体と、前記画像ステーション
における画像形成と前記搬送体における記録材の搬送駆
動のタイミングとを制御するための制御手段とを有する
画像形成装置において、前記制御手段による駆動動作を
画像形成時以外にも可能に構成したことを特徴とする画
像形成装置。1. An arbitrary number of image forming stations having image forming means around an endlessly moving image carrier, a carrier for sequentially transporting a recording material, an image forming in the image station and the carrier. An image forming apparatus having a control means for controlling the timing of the recording material conveyance drive, wherein the drive operation by the control means is configured to be possible other than during image formation.
この検知手段により異常を検知したときは、前記画像形
成手段による画像形成動作を停止し、かつ、前記制御手
段による駆動動作を所定時間継続するよう構成したこと
を特徴とする請求項１記載の画像形成装置。2. A recording medium conveyance state detecting means is provided,
2. The image according to claim 1, wherein when an abnormality is detected by the detection means, the image forming operation by the image forming means is stopped and the drive operation by the control means is continued for a predetermined time. Forming equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3213438A JPH0553405A (en) | 1991-08-26 | 1991-08-26 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3213438A JPH0553405A (en) | 1991-08-26 | 1991-08-26 | Image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0553405A true JPH0553405A (en) | 1993-03-05 |
Family
ID=16639235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3213438A Withdrawn JPH0553405A (en) | 1991-08-26 | 1991-08-26 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0553405A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6775486B2 (en) | 2002-02-15 | 2004-08-10 | Sharp Kabushiki Kaisha | Image forming apparatus |
| US6876820B2 (en) | 2003-02-18 | 2005-04-05 | Sharp Kabushiki Kaisha | Image forming apparatus |
| US6957022B2 (en) | 2003-02-07 | 2005-10-18 | Sharp Kabushiki Kaisha | Image forming apparatus |
| JP2007017893A (en) * | 2005-07-11 | 2007-01-25 | Fuji Xerox Co Ltd | Image forming apparatus |
| US8047539B2 (en) * | 2010-02-26 | 2011-11-01 | Canon Kabushiki Kaisha | Image forming apparatus |
-
1991
- 1991-08-26 JP JP3213438A patent/JPH0553405A/en not_active Withdrawn
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6775486B2 (en) | 2002-02-15 | 2004-08-10 | Sharp Kabushiki Kaisha | Image forming apparatus |
| US7085504B2 (en) | 2002-02-15 | 2006-08-01 | Sharp Kabushiki Kaisha | Image forming apparatus |
| US6957022B2 (en) | 2003-02-07 | 2005-10-18 | Sharp Kabushiki Kaisha | Image forming apparatus |
| US6876820B2 (en) | 2003-02-18 | 2005-04-05 | Sharp Kabushiki Kaisha | Image forming apparatus |
| CN100414443C (en) * | 2003-02-18 | 2008-08-27 | 夏普株式会社 | Imaging equipment |
| JP2007017893A (en) * | 2005-07-11 | 2007-01-25 | Fuji Xerox Co Ltd | Image forming apparatus |
| US8047539B2 (en) * | 2010-02-26 | 2011-11-01 | Canon Kabushiki Kaisha | Image forming apparatus |
| US20120007308A1 (en) * | 2010-02-26 | 2012-01-12 | Canon Kabushiki Kaisha | Image forming apparatus |
| US8186674B2 (en) | 2010-02-26 | 2012-05-29 | Canon Kabushiki Kaisha | Image forming apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7376364B2 (en) | Image forming apparatus | |
| KR920007713B1 (en) | Paper transfer control method in printing apparatus and printing part using this | |
| JP2006337552A (en) | Color image forming apparatus and its control method | |
| US6052552A (en) | Image forming apparatus with skew correction | |
| US5926670A (en) | Image forming apparatus cleaning an intermediate transfer member carrying a concurrently existing plurality of toner image pages | |
| JPS63311360A (en) | Image forming device | |
| JP5072238B2 (en) | Image forming apparatus | |
| JP2000335785A (en) | Sheet carrying device and image forming device | |
| JPH0553405A (en) | Image forming device | |
| US6522843B2 (en) | Image forming apparatus capable of judging whether it is appropriate to form an image on a sheet and controlling the image formation accordingly | |
| US20090073514A1 (en) | Image forming apparatus | |
| JP2002338084A (en) | Image forming device | |
| JP2707754B2 (en) | Method for detecting residual recording media | |
| JPH10236697A (en) | Sheet carrying device and image forming device | |
| JPH11119490A (en) | Image forming device | |
| JP3241970B2 (en) | Image forming device | |
| JP2005084307A (en) | Image forming apparatus | |
| JP4568180B2 (en) | Image recording device | |
| JP2900420B2 (en) | Image recording device | |
| JP2002244523A (en) | Image forming device | |
| JPH0398059A (en) | Composite image forming device | |
| JP2024070080A (en) | Image forming device | |
| JP2005172905A (en) | Image forming apparatus | |
| JPH08179579A (en) | Image recorder | |
| JP2001282016A (en) | Image forming device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19981112 |