JPH04189239A - Offset and skew correcting system in printer device - Google Patents
Offset and skew correcting system in printer deviceInfo
- Publication number
- JPH04189239A JPH04189239A JP2312785A JP31278590A JPH04189239A JP H04189239 A JPH04189239 A JP H04189239A JP 2312785 A JP2312785 A JP 2312785A JP 31278590 A JP31278590 A JP 31278590A JP H04189239 A JPH04189239 A JP H04189239A
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- JP
- Japan
- Prior art keywords
- optical system
- signal
- paper
- skew
- offset
- Prior art date
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Links
- 238000012937 correction Methods 0.000 claims abstract description 35
- 238000001514 detection method Methods 0.000 claims abstract description 34
- 230000003287 optical effect Effects 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 abstract 3
- 230000001235 sensitizing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 24
- 230000037303 wrinkles Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
Landscapes
- Accessory Devices And Overall Control Thereof (AREA)
- Paper Feeding For Electrophotography (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
- Editing Of Facsimile Originals (AREA)
- Handling Of Sheets (AREA)
- Dot-Matrix Printers And Others (AREA)
- Laser Beam Printer (AREA)
- Controlling Sheets Or Webs (AREA)
- Registering Or Overturning Sheets (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
Description
【発明の詳細な説明】
〔概要〕
印刷装置、特にレーザープリンタにおけるオフセット及
びスキュー補正方式に関し、
用紙のオフセット及びスキューの誤差を出来るだけ低減
することを目的とし、
印刷装置におけるオフセット及びスキ、−補正方式であ
って、用紙を搬入する待機ローラと感光用ドラムの間に
、搬入された用紙の状態を検出する検出手段と、該検出
手段からの検出信号を受け、光学系の制御信号を出力す
る制御手段とを備え、該検出手段による検出信号により
オフセット量を検出して印字開始位置と印字開始タイミ
ングを補正するとともに、該検出信号から用紙のスキュ
ー角を算出してスキュー角を補正すべく光学系の位置を
調整するように構成する。[Detailed Description of the Invention] [Summary] Regarding offset and skew correction methods in printing devices, especially laser printers, the purpose of this invention is to reduce offset and skew errors of paper as much as possible. The method includes a detection means for detecting the state of the paper carried in between a standby roller that carries the paper and a photosensitive drum, and a detection signal from the detection means and outputs a control signal for the optical system. The control means detects the offset amount using the detection signal from the detection means to correct the print start position and print start timing, and the optical system calculates the skew angle of the paper from the detection signal and corrects the skew angle. configured to adjust the position of the system;
本発明は印刷装置、特にレーザープリンタにおけるオフ
セット及びスキュー補正方式に関する。The present invention relates to an offset and skew correction method in a printing device, particularly a laser printer.
第８図は従来の要部構成図である。１は用紙Ｐを搬入す
る待機ローラ、２はその周囲にて露光、現像、転写等を
行う感光用ドラム、３はレーザー発光源やポリゴンミラ
ー等からなる光学系、４は光学系３の制御及びモータＭ
の制御等を行う制御・回路である。FIG. 8 is a diagram showing the configuration of a conventional main part. 1 is a standby roller for carrying in the paper P; 2 is a photosensitive drum that performs exposure, development, transfer, etc. around it; 3 is an optical system consisting of a laser emitting source, a polygon mirror, etc.; 4 is a control system for the optical system 3; Motor M
This is a control/circuit that performs control, etc.
用紙Ｐが矢印方向（副走査方向）に搬入されると一旦待
機ローラ１で停止し、レーザーの発光タイミングに合わ
せて用紙搬入を開始し、印字開始位置を調整している。When the paper P is carried in in the direction of the arrow (sub-scanning direction), it is temporarily stopped by the standby roller 1, and the paper is started to be carried in in synchronization with the laser emission timing to adjust the printing start position.
この場合、用紙搬送方向に対して直角な方向（主走査方
向）は特に調整せず機構部分の精度に依存している。In this case, the direction perpendicular to the paper conveyance direction (main scanning direction) is not particularly adjusted and depends on the accuracy of the mechanical parts.
このような従来構成では以下のような問題がある。即ち
、
■待機ローラで用紙を一時停止する際に、正確に停止さ
せることが困難なために、印字開始位置に誤差を生じや
すい。Such a conventional configuration has the following problems. That is, (1) When the paper is temporarily stopped by the standby roller, it is difficult to stop the paper accurately, which tends to cause errors in the printing start position.
■一方、主走査方向では機構部分の精度に依存している
ために、その精度のバラツキがそのまま印字領域のバラ
ツキとなって現れる。(2) On the other hand, since the main scanning direction depends on the precision of the mechanical parts, variations in precision directly appear as variations in the printing area.
次に、用紙のスキュー状態の問題点を説明する。Next, the problem of paper skew will be explained.
従来のスキュー補正機構はセンサによりスキュー状態を
判断し、その検出値によりスキューを補正していた。A conventional skew correction mechanism uses a sensor to determine the skew state and corrects the skew based on the detected value.
第９図は従来のスキュー補正の一例の説明図である。図
示のように、用紙Ｐの両側にスキュー補正用のローラＲ
１，Ｒ２がありこのローラの回転を調整することにより
機械的に用紙の傾きを補正している。FIG. 9 is an explanatory diagram of an example of conventional skew correction. As shown in the figure, there are rollers R for skew correction on both sides of the paper P.
1 and R2, and by adjusting the rotation of these rollers, the inclination of the paper is mechanically corrected.
第１０図は従来のスキュー補正の他の例の説明図である
。傾いた用紙Ｐに対してレーザービームＬＢを図示のよ
うに走査することになるが、この場合には読み取られた
データを所定の画像処理により回転させる。FIG. 10 is an explanatory diagram of another example of conventional skew correction. The tilted paper P is scanned with the laser beam LB as shown in the figure, but in this case, the read data is rotated by predetermined image processing.
しかしながら、上述の２つの方法には次のような問題が
ある。即ち、第９図の方法ではローラＲ１とローラＲ２
の回転差によりスキューを補正しているため、ローラの
スリップ等により完全にスキュー補正ができるとは限ら
ない。また、補正により用紙にしわが生じたり、さらに
、用紙が感光用ドラムに到達するまでに傾きが生じたり
することがある。However, the above two methods have the following problems. That is, in the method of FIG. 9, roller R1 and roller R2
Since the skew is corrected by the difference in rotation between the two, it is not always possible to completely correct the skew due to roller slips, etc. Further, the correction may cause wrinkles on the paper, and furthermore, the paper may be tilted before it reaches the photosensitive drum.
また、第１０図ではビデオマツプデータを補正するため
に、第１１図に示すように文字の線にギザギザを生じる
。In addition, in FIG. 10, in order to correct the video map data, jagged lines are created in the character lines as shown in FIG. 11.
本発明の目的は、印字装置、特にレーザープリンタにふ
けるオフセット及びスキューを出来るだけ低減すること
にある。It is an object of the present invention to reduce as much as possible the offsets and skews suffered by printing devices, especially laser printers.
本発明は印刷装置におけるオフセット及びスキュー補正
方式であって、用紙を搬入する待機ローラと感光用ドラ
ムの間に、搬入された用紙の状態を検出する検出手段５
と、該検出手段からの検出信号を受け、光学系の制御信
号Ｃ５及び光学系調整モータの駆動信号ＭＳを出力する
制御手段４とを備え、該検出手段による検出信号により
オフセット量Ｘを検出して印字開始位置と印字開始タイ
ミングを補正するとともに、該検出信号から用紙のスキ
ュー角θを算出してスキュー角を補正すべく該駆動信号
により光学系の位置を調整することを特徴とする。The present invention is an offset and skew correction method for a printing device, and a detection means 5 is provided between a standby roller for carrying paper and a photosensitive drum to detect the state of paper carried in.
and a control means 4 that receives a detection signal from the detection means and outputs an optical system control signal C5 and an optical system adjustment motor drive signal MS, and detects the offset amount X based on the detection signal from the detection means. The present invention is characterized in that the print start position and print start timing are corrected using the detection signal, and the skew angle θ of the paper is calculated from the detection signal, and the position of the optical system is adjusted using the drive signal to correct the skew angle.
本発明では待機ローラの後の感光用ドラムとの間に用紙
検出手段としてＣＣＤ等のリニア・スケールセンサを設
け、これによりオフセット量を検出し、このデータで印
字開始位置を調整する。本発明では特に副走査方向のオ
フセットに対しては待機ローラの停止タイミングと印字
開始タイミングの両方を調整することができる。In the present invention, a linear scale sensor such as a CCD is provided as paper detection means between the standby roller and the photosensitive drum, and the offset amount is detected by this and the printing start position is adjusted using this data. In the present invention, both the stop timing of the standby roller and the print start timing can be adjusted particularly for offsets in the sub-scanning direction.
さらに、本発明ではセンサの検出信号からスキュー角を
算出し、このスキュー角に基づき光学系の位置を調整し
て補正する。Furthermore, in the present invention, a skew angle is calculated from the detection signal of the sensor, and the position of the optical system is adjusted and corrected based on this skew angle.
第１図は本発明の要部構成図である。図示のように待機
ローラ１と感光用ドラム２との間のドラム側に用紙検出
手段としてセンサ５を設け、まず印刷時には待機ローラ
１で搬送タイミングを合わせて用紙Ｐを送り、その後に
センサ５でオフセット量を検出し検出信号Ｓを制御回路
４に送り、誤差があれば印字開始タイミングと印字開始
位置を調整する。FIG. 1 is a block diagram of the main parts of the present invention. As shown in the figure, a sensor 5 is provided as paper detection means on the drum side between the standby roller 1 and the photosensitive drum 2. During printing, first, the standby roller 1 transports the paper P at the same timing, and then the sensor 5 The amount of offset is detected and a detection signal S is sent to the control circuit 4, and if there is an error, the print start timing and print start position are adjusted.
第２図は本発明の制御回路の要部構成図である。FIG. 2 is a block diagram of the main parts of the control circuit of the present invention.
制御回路４は主として、ＢＤ値補正回路４１と、ビデオ
データ発信回路４２と、光学系調整モータ駆動信号発生
回路４３により構成される。ＢＤ値補正回路４１にはセ
ンサ５からの検出信号ＳとＢＤ倍信号入力される。ここ
で、Ｂ Ｄ （ｂｅａｍ ｄｅｔｅｃｔ）信号とはレー
ザービームの走査を検出する信号であり、このためのセ
ンサ（図示せず）をレーザービームの走査開始側、即ち
、用紙搬送方向の用紙左側に設けている。従って、セン
サ５により判別したオフセット量ＸをＢＤ倍信号加算し
て補正し、補正信号ＡＳをビデオデータ発信回路４２に
送出する。The control circuit 4 mainly includes a BD value correction circuit 41, a video data transmission circuit 42, and an optical system adjustment motor drive signal generation circuit 43. The detection signal S from the sensor 5 and the BD multiplied signal are input to the BD value correction circuit 41. Here, the BD (beam detect) signal is a signal that detects the scanning of the laser beam, and a sensor (not shown) for this purpose is provided on the laser beam scanning start side, that is, on the left side of the paper in the paper conveyance direction. ing. Therefore, the offset amount X determined by the sensor 5 is corrected by adding the BD multiplied signal, and a correction signal AS is sent to the video data transmission circuit 42.
ビデオデータ発信回路４２はＢＤ値補正回路４１からの
補正信号ＡＳに基づき光学系の制御信号Ｃ８を発生する
。The video data transmission circuit 42 generates an optical system control signal C8 based on the correction signal AS from the BD value correction circuit 41.
光学系調整モータ駆動発生回路４３は、センサ５からの
検出信号Ｓによりスキュー量θを算出し、算出結果によ
り光学系調整モータの駆動信号ＭＳを発生する。The optical system adjustment motor drive generation circuit 43 calculates the skew amount θ based on the detection signal S from the sensor 5, and generates a drive signal MS for the optical system adjustment motor based on the calculation result.
このように、用紙搬送方向のオフセットに対しては待機
ローラで印字開始タイミングを合わせて送った後、セン
サ５により検出し、さらに誤差があればレーザーの発光
タイミングを変えるという二重の補正を行っている。ま
た、用紙搬送方向に直角な方向のオフセットに対しては
、印字開始位置を変えることにより補正できるので、機
構部分の精度に依存することなく精度を得ることができ
る。In this way, offsets in the paper conveyance direction are corrected in a double manner: after the paper is fed with the standby roller at the same printing start timing, it is detected by the sensor 5, and if there is an error, the laser emission timing is changed. ing. Further, since offset in the direction perpendicular to the paper conveyance direction can be corrected by changing the print start position, accuracy can be obtained without depending on the accuracy of the mechanical parts.
第３図はセンサと用紙の関係の説明図である。FIG. 3 is an explanatory diagram of the relationship between the sensor and paper.
センサ５は複数の検出素子が検出位置Ｘにおいて主走査
方向（即ち、用紙搬送方向に直角な方向）に配列されて
いる。そして、用紙が検出位置Ｘに到達すると、センサ
がこれを検出して制御回路４に送り、所定時間後にレー
ザーを発光させる。なお、Ｘは用紙の横方向のオフセッ
ト量である。The sensor 5 has a plurality of detection elements arranged at the detection position X in the main scanning direction (that is, in the direction perpendicular to the paper conveyance direction). Then, when the paper reaches the detection position X, the sensor detects it and sends it to the control circuit 4, which causes the laser to emit light after a predetermined period of time. Note that X is the offset amount in the lateral direction of the paper.
第４．５図は本発明のスキュー補正の説明図である。セ
ンサ５において、検出位置ｙ１にて用紙の一端を検出し
たとき、一端Ａで検出したか他端Ｂで検出したかにより
、どちら側にスキューしているかを判別する。次に、右
側のセンサを見てＸ軸方向に最も多く用紙幅を検出する
点ｙｂを識別する。FIG. 4.5 is an explanatory diagram of skew correction according to the present invention. When the sensor 5 detects one end of the paper at the detection position y1, it is determined to which side the paper is skewed depending on whether it is detected at one end A or the other end B. Next, the sensor on the right side is looked at and the point yb where the paper width is detected most often in the X-axis direction is identified.
そして、ｙｌとｙｂ間の距離Ｃとこの領域の面積を。Then, the distance C between yl and yb and the area of this region.
算出し、Ａ−Ｂ間の距離りを算出する。従って、スキュ
ー角θは以下の式で表せる。and calculate the distance between A and B. Therefore, the skew angle θ can be expressed by the following formula.
５＝Ｃ（Ｃｔａｎθ 十〇）＋２
、’、 ｔａｎθ ＝ （２Ｓ／Ｃ−Ｄ） ＋
にのように、スキュー角θが求まるので、このスキュー
角に基づき光学系調整モータの駆動信号ＭＳを発生させ
、それにより光学系調整モータを回転させ、光学系を回
転させることで光学系の位置を調整する。しかし、この
ままでは第６図に示すように、印字がずれてしまうので
印字開始位置がずれてしまう。そこで第７図に示すよう
に、最初の行からＹｌ離れたところでは、Ｙｌ ｓｉｎ
θだけ印字開始位置を遅らせれば正確に印字することが
できる。5=C(Ctanθ 10)+2,', tanθ=(2S/C-D)+
Since the skew angle θ is determined as shown in the figure, the drive signal MS for the optical system adjustment motor is generated based on this skew angle, and the optical system adjustment motor is thereby rotated.By rotating the optical system, the position of the optical system can be determined. Adjust. However, if this continues, as shown in FIG. 6, the printing will be shifted and the printing start position will be shifted. Therefore, as shown in Fig. 7, at a place Yl away from the first row, Yl sin
Accurate printing can be achieved by delaying the printing start position by θ.
このように、本発明により、用紙を動かすことなくスキ
ューを補正するため、用紙のつまり、しわ、用紙角度修
正ミスなどが減り、またスキュー修正後にドラムに到達
するまでに再度スキューすることもなくなる。そして、
ビデオマツプデータを補正した場合のように文字の線が
ギザギザになることもない。As described above, according to the present invention, since the skew is corrected without moving the paper, paper clogging, wrinkles, paper angle correction errors, etc. are reduced, and the paper does not become skewed again before reaching the drum after skew correction. and,
The text lines do not become jagged, as they do when video map data is corrected.
以上説明したように、本発明によれば、副走査方向のオ
フセットに対しては待機ローラで印字開始タイミングを
合わせ、センサにより検出し、さらに誤差があればレー
ザーの発光タイミングを変えるという二重の補正を行い
、また、主走査方向のオフセットに対しては、印字開始
位置を変えることにより補正できるので、機構部分の精
度に依存することなく精度を得ることができる。As explained above, according to the present invention, offsets in the sub-scanning direction are handled by adjusting the print start timing with the standby roller, detecting with a sensor, and changing the laser emission timing if there is an error. Further, offset in the main scanning direction can be corrected by changing the printing start position, so accuracy can be obtained without depending on the accuracy of the mechanical part.
さらに、用紙を動かすことなくスキューを補正すること
が出来るため、用紙のつまり、しわ、用紙角度修正ミス
などが減り、またスキュー修正後にドラムに到達するま
でに再度スキューすることもなくなる。そして、従来の
ビデオマツプデータを補正した場合のような文字の線が
ギザギザになることもない。Furthermore, since the skew can be corrected without moving the paper, paper jams, wrinkles, paper angle correction errors, etc. are reduced, and the paper does not become skewed again before it reaches the drum after skew correction. Furthermore, the character lines do not become jagged, which is the case when conventional video map data is corrected.
第１図は本発明の要部構成図、
第２図は本発明の制御回路の構成図、
第３図は本発明のセンサ部の説明図、
第４〜７図は本発明のスキュー補正の説明図、第８図は
従来の要部構成図、及び
第９〜１１図は従来のスキュー補正の問題点の説明図で
ある。
（符号の説明）
１・・・待機ローラ、
２・・・感光用ドラム、
３・・・光学系、
４・・・制御回路、
５・・・センサ、
４１・・・ＢＤ値補正回路、
４２・・・ビデオデータ発信回路、
４３・・・駆動信号発生回路、
Ｍ・・・モータ、
Ｓ・・・検出信号、
Ａｓ・・・補正信号、
ＣＳ・・・光学系制御信号、
Ｐ・・・用紙、
ＭＳ・・・調整モータ駆動信号、
Ｃ８・・・光学系調整モータ。
本発明の要部構成図
１ｈ１５１巨１
第２図
本発明のセンサ部の説明図
第３０
本発明のスキュー補正の説明図（その１）本発明のスキ
ュー補正の説明図（その２）第５回
本発明のスキュー補正の説明図（その３）本発明のスキ
ュー補正の説明図（その４）第７図
り８図
従来のスキュー補正の説明図
第９区
従来のスキュー補正の問題点の説明図
従来のスキュー補正の問題点の説明図
第１１回Fig. 1 is a block diagram of the main parts of the present invention, Fig. 2 is a block diagram of the control circuit of the present invention, Fig. 3 is an explanatory diagram of the sensor section of the present invention, and Figs. 4 to 7 are diagrams of the skew correction of the present invention. An explanatory diagram, FIG. 8 is a conventional main part configuration diagram, and FIGS. 9 to 11 are explanatory diagrams of problems in conventional skew correction. (Explanation of symbols) 1... Standby roller, 2... Photosensitive drum, 3... Optical system, 4... Control circuit, 5... Sensor, 41... BD value correction circuit, 42 ...Video data transmission circuit, 43...Drive signal generation circuit, M...Motor, S...Detection signal, As...Correction signal, CS...Optical system control signal, P... Paper, MS...adjustment motor drive signal, C8...optical system adjustment motor. Main part configuration diagram of the present invention 1 h 151 large 1 Figure 2 Explanatory diagram of the sensor section of the present invention No. 30 Explanatory diagram of the skew correction of the present invention (Part 1) Explanatory diagram of the skew correction of the present invention (Part 2) Part 5 Explanatory diagram of the skew correction of the present invention (part 3) Explanatory diagram of the skew correction of the present invention (part 4) Figure 7 Diagram 8 An explanatory diagram of the conventional skew correction Section 9 An explanatory diagram of the problems of the conventional skew correction Conventional Explanatory diagram of problems with skew correction Part 11
Claims (1)
であって、 用紙を搬入する待機ローラと感光用ドラムの間に、搬入
された用紙の状態を検出する検出手段（５）と、 該検出手段からの検出信号を受け補正した後光学系の制
御信号（ＣＳ）及び光学系調整モータの駆動信号（ＭＳ
）を出力する制御手段（４）とを備え、該検出手段によ
る検出信号によりオフセット量（Ｘ）を検出して印字開
始位置と印字開始タイミングを補正するとともに、該検
出信号から用紙のスキュー角（θ）を算出してスキュー
角を補正すべく該駆動信号により光学系（３）の位置を
調整することを特徴とする印刷装置におけるオフセット
及びスキュー補正方式。 ２、該制御手段は、該検出信号及びＢＤ（ｂｅａｍｄｅ
ｔｅｃｔ）信号を受けこれらを加算した補正信号（ＡＳ
）を出力するＢＤ値補正回路（４１）と、該補正信号を
受け光学系制御信号（ＣＳ）を該光学系に出力するビデ
オデータ発信回路（４２）と、光学系調整モータの駆動
信号を発生する駆動信号発生回路（４３）を具備する請
求項１に記載のオフセット及びスキュー補正方式。[Scope of Claims] 1. An offset and skew correction method in a printing device, which includes: a detection means (5) for detecting the state of paper carried in between a standby roller that carries paper and a photosensitive drum; After receiving and correcting the detection signal from the detection means, the optical system control signal (CS) and the optical system adjustment motor drive signal (MS
), the offset amount (X) is detected by the detection signal from the detection means to correct the print start position and print start timing, and the paper skew angle ( An offset and skew correction method in a printing apparatus, characterized in that the position of the optical system (3) is adjusted by the drive signal to calculate the skew angle (θ) and correct the skew angle. 2. The control means controls the detection signal and the BD (beamde).
tect) signal and the correction signal (AS
), a video data transmission circuit (42) that receives the correction signal and outputs an optical system control signal (CS) to the optical system, and generates a drive signal for the optical system adjustment motor. 2. The offset and skew correction method according to claim 1, further comprising a drive signal generation circuit (43).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2312785A JPH04189239A (en) | 1990-11-20 | 1990-11-20 | Offset and skew correcting system in printer device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2312785A JPH04189239A (en) | 1990-11-20 | 1990-11-20 | Offset and skew correcting system in printer device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04189239A true JPH04189239A (en) | 1992-07-07 |
Family
ID=18033376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2312785A Pending JPH04189239A (en) | 1990-11-20 | 1990-11-20 | Offset and skew correcting system in printer device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04189239A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06270465A (en) * | 1993-03-22 | 1994-09-27 | Nec Corp | Electrophotographic recording method and apparatus |
| EP0694411A3 (en) * | 1994-07-26 | 1996-11-13 | Mitsubishi Electric Corp | Sheet carrying apparatus |
| WO2003070473A1 (en) * | 2002-02-21 | 2003-08-28 | Seiko Epson Corporation | Printer, method for determining top edge of object to be printed, method for determining bottom edge of object to be printed, computer program, and computer system |
| JP2012063523A (en) * | 2010-09-15 | 2012-03-29 | Ricoh Co Ltd | Image processor, image-forming device, image processing method and skew correction control program |
| JP2021084783A (en) * | 2019-11-29 | 2021-06-03 | 株式会社リコー | Image forming apparatus and transfer control method of the image forming apparatus |
-
1990
- 1990-11-20 JP JP2312785A patent/JPH04189239A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06270465A (en) * | 1993-03-22 | 1994-09-27 | Nec Corp | Electrophotographic recording method and apparatus |
| EP0694411A3 (en) * | 1994-07-26 | 1996-11-13 | Mitsubishi Electric Corp | Sheet carrying apparatus |
| WO2003070473A1 (en) * | 2002-02-21 | 2003-08-28 | Seiko Epson Corporation | Printer, method for determining top edge of object to be printed, method for determining bottom edge of object to be printed, computer program, and computer system |
| US6984082B2 (en) | 2002-02-21 | 2006-01-10 | Seiko Epson Corporation | Printer, method for determining top edge of object to be printed, method for determining bottom edge of object to be printed, computer program, and computer system |
| CN100343069C (en) * | 2002-02-21 | 2007-10-17 | 精工爱普生株式会社 | Printer, method of determining lower end of printed body, computer program and computer system |
| JP2012063523A (en) * | 2010-09-15 | 2012-03-29 | Ricoh Co Ltd | Image processor, image-forming device, image processing method and skew correction control program |
| US8774700B2 (en) | 2010-09-15 | 2014-07-08 | Ricoh Company, Ltd. | Image processing apparatus, an image forming apparatus, an image processing method and a recording medium |
| JP2021084783A (en) * | 2019-11-29 | 2021-06-03 | 株式会社リコー | Image forming apparatus and transfer control method of the image forming apparatus |
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