JPH03239577A - Printing method - Google Patents

Printing method

Info

Publication number
JPH03239577A
JPH03239577A JP2034850A JP3485090A JPH03239577A JP H03239577 A JPH03239577 A JP H03239577A JP 2034850 A JP2034850 A JP 2034850A JP 3485090 A JP3485090 A JP 3485090A JP H03239577 A JPH03239577 A JP H03239577A
Authority
JP
Japan
Prior art keywords
paper
speed
size
roller
fixing roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2034850A
Other languages
Japanese (ja)
Inventor
Naohiro Okada
直浩 岡田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Machinery Ltd
Original Assignee
Murata Machinery Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Murata Machinery Ltd filed Critical Murata Machinery Ltd
Priority to JP2034850A priority Critical patent/JPH03239577A/en
Publication of JPH03239577A publication Critical patent/JPH03239577A/en
Pending legal-status Critical Current

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  • Handling Of Cut Paper (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Paper Feeding For Electrophotography (AREA)

Abstract

PURPOSE:To improve printing quality to a sheet by setting the speed of registration rollers to a speed slower than that of a fixing roller, detecting a sheet size, and delaying an image forming timing to an image holder as the size is smaller. CONSTITUTION:The peripheral speed of registration rollers 5 is synchronized with a processing speed of a photosensitive drum 6, and set to a speed slower than the peripheral speed of a fixing roller 8. The roller 8 is rotated at a speed similar to that of prior art by the setting, the rotation speed of the drum 6 is slightly reduced, the outer diameter of the roller 5 is formed slightly smaller than that of the roller 5 of prior art, and black stripe 30 can be prevented by rotating it at the same speed as that of the prior art. In addition, the smaller the size of the sheet 3 becomes, the slower the writing timing of a reading optical system 13, thereby approaching its printing length to a theoretical value even when the sheet 3 of small size such as A4 size is printed.

Description

【発明の詳細な説明】 生栗±立剋貝公立 本発明は、プリンタ等の画像形成装置における印字方法
に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing method in an image forming apparatus such as a printer.

従来坐肢歪 第2図はプリンタの一従来例を示しており、給紙ローラ
lにより給紙カセット2から繰り出された用紙(記録紙
)3を用紙分離装置4により一枚ずつ分離し、レジスト
ローラ5を介して感光体ドラム6と転写器7との間に導
く。レジストローラ5と感光体ドラム6との間には感光
体ドラム6の近傍部位に山形ガイド部9aを有するペー
パガイド9が設けられる。ペーパガイド9は用紙3の移
動を案内する。感光体ドラム6の表面にはトナー像が形
成されており、このトナー像が用紙3に転写される。ト
ナー像を転写された用紙3は次いで定着ローラ8の位置
に搬送され、ここでトナー像の定着工程が行われる。
Conventional sitting limb distortion FIG. 2 shows a conventional example of a printer, in which paper (recording paper) 3 fed out from a paper cassette 2 by a paper feed roller l is separated one by one by a paper separation device 4, It is guided between the photosensitive drum 6 and the transfer device 7 via the roller 5 . A paper guide 9 having a chevron-shaped guide portion 9a near the photosensitive drum 6 is provided between the registration roller 5 and the photosensitive drum 6. The paper guide 9 guides the movement of the paper 3. A toner image is formed on the surface of the photosensitive drum 6, and this toner image is transferred to the paper 3. The paper 3 onto which the toner image has been transferred is then conveyed to the position of the fixing roller 8, where a toner image fixing process is performed.

かかる構成において、レジストローラ5と定着ローラ8
の回転速度は感光体ドラム6のプロセス(作像)速度と
同期している。即ち、図示の如くレジストローラ5はそ
の外径が定着ローラ8の外径よりも小さくなっているが
、適宜の調整手段により両者の周速度が同一になるよう
に設定されている。
In this configuration, the registration roller 5 and the fixing roller 8
The rotational speed of the photosensitive drum 6 is synchronized with the process (image forming) speed of the photosensitive drum 6. That is, as shown in the figure, the outer diameter of the registration roller 5 is smaller than the outer diameter of the fixing roller 8, but the circumferential speeds of both rollers are set to be the same by appropriate adjusting means.

しかしながら、上記の如く感光体ドラム6のプロセス速
度に同期させてレジストローラ5及び定着ローラ8を同
一の周速度で回転させる場合は、両者の用紙3に対する
搬送力が同一になるため、以下に示すような欠点がある
However, when the registration roller 5 and the fixing roller 8 are rotated at the same circumferential speed in synchronization with the process speed of the photosensitive drum 6 as described above, the conveying force of both of them for the paper 3 becomes the same, so the following There are some drawbacks.

即ち、搬送中、レジストローラ5〜定着ローラ8間に位
置する用紙3に充分なテンションが発生せず、用紙3の
後端がレジストローラ5から離脱し、用紙3を定着ロー
ラ8の搬送力のみで搬送する際に、用紙3の後端部が山
形ガイド部9aの頂上部に倒れ込み、山形ガイド部9a
に発生する摩擦抵抗力により一瞬の間用紙3と感光体ド
ラム6の接触が不安定になる状態を生じる。かかる状態
を生じると、用紙3の後端部に第3図に示すような黒す
じ30が発生し、印字品質を損ねる結果になる。
That is, during conveyance, sufficient tension is not generated in the paper 3 located between the registration rollers 5 and the fixing rollers 8, and the trailing edge of the paper 3 separates from the registration rollers 5, causing the paper 3 to be transported only by the conveying force of the fixing rollers 8. When conveying the paper 3, the rear end of the paper 3 collapses onto the top of the chevron-shaped guide portion 9a, and
Due to the frictional resistance force generated, the contact between the paper 3 and the photosensitive drum 6 becomes unstable for a moment. If such a situation occurs, a black streak 30 as shown in FIG. 3 will occur at the rear end of the paper 3, resulting in a loss of print quality.

かかる黒すし30の発生を防止する方法として、レジス
トローラ5の周速度を定着ローラ8の周速度よりも遅く
、且つ感光体ドラム6のプロセス速度に同期させる技術
が考えられる。即ち、そうすれば、定着ローラの搬送力
がレジストローラの搬送力よりも大きくなり、用紙3が
定着ローラ側に向けて引っ張り勝手の状態で搬送され、
搬送中用紙3に充分なテンションが付与される。それ故
、用紙3の後端部がレジストローラから離脱する際にも
、前記テンションの効果により、用紙の搬送力が確保さ
れ、像保持体の近傍部位に設けられる山形ガイド部9a
の摩擦抵抗力に打ち勝ち、用紙と感光体ドラム6の接触
が安定する。従って、用紙3の後端部に黒すじ30を発
生することがない。
As a method for preventing the occurrence of such black spots 30, a technique can be considered in which the circumferential speed of the registration roller 5 is made slower than the circumferential speed of the fixing roller 8 and synchronized with the process speed of the photoreceptor drum 6. That is, if this is done, the conveyance force of the fixing roller becomes larger than the conveyance force of the registration roller, and the paper 3 is conveyed in a tensile state toward the fixing roller.
Sufficient tension is applied to the paper 3 during conveyance. Therefore, even when the rear end of the paper 3 separates from the registration roller, the conveyance force of the paper is ensured by the effect of the tension, and the chevron-shaped guide portion 9a provided in the vicinity of the image holder
The contact between the paper and the photosensitive drum 6 is stabilized by overcoming the frictional resistance. Therefore, black streaks 30 are not generated at the trailing edge of the paper 3.

■ <”′ しよ°と る量 ところで、上記の如く定着ローラ8の周速度を感光体ド
ラム6のプロセス速度よりも速く設定する場合は、用紙
3の横幅方向における印字長が理論上の印字長よりも短
くなるおそれがある。
By the way, when the circumferential speed of the fixing roller 8 is set faster than the process speed of the photoreceptor drum 6 as described above, the print length in the width direction of the paper 3 is the theoretical print length. There is a possibility that it will be shorter than the length.

かかる不具合を解消するためには、レジストローラ5及
び定着ローラ8の外径寸法を同一の割合で大きくし、こ
れらの周速度を向上させて用紙3の搬送速度を大きくす
ればよい。即ち、このようにすれば、その分、印字長を
稼げ、印字長を理論値に近づけることが可能になるから
である。
In order to solve this problem, the outer diameter dimensions of the registration roller 5 and the fixing roller 8 may be increased by the same ratio, and the peripheral speeds of these rollers may be increased to increase the conveyance speed of the paper 3. That is, by doing so, the print length can be increased accordingly, and the print length can be brought closer to the theoretical value.

しかるに、かかる場合において、B4サイズの用紙を搬
送する場合を基準にしてレジストローラ5及び定着ロー
ラ8の外径寸法を設定せんとすれば、B4サイズの用紙
を搬送する際には印字長を理論値に近づけることができ
るものの、これよりも小サイズの用紙、例えばA4サイ
ズやB5サイズの用紙を搬送する場合は依然として印字
長が短くなるという欠点がある。この原因は、A4サイ
ズやB5サイズの用紙の搬送方向寸法が84サイズのそ
れよりも短かいため、定着ローラ8により搬送される時
間が短く、その分搬送速度の向上による効果を享受でき
ないことによる。
However, in such a case, if the outer diameter dimensions of the registration roller 5 and fixing roller 8 are set based on the case of conveying B4 size paper, the print length will be theoretically determined when conveying B4 size paper. Although it is possible to approach this value, there is still a drawback that the print length is short when transporting paper of a smaller size than this, for example, A4 size or B5 size paper. The reason for this is that the dimensions in the conveyance direction of A4 size and B5 size paper are shorter than those of 84 size paper, so the time for conveyance by the fixing roller 8 is shorter, and the effect of increased conveyance speed cannot be enjoyed accordingly. .

本発明はかかる現状に鑑みてなされたものであり、用紙
に対する印字品質を向上できる印字方法を提供すること
を目的とする。
The present invention has been made in view of the current situation, and an object of the present invention is to provide a printing method that can improve the quality of printing on paper.

i を”′ るための 本発明は、レジストローラにより用紙を像保持体に導き
、像保持体により用紙に転写されたトナー像を定着ロー
ラにより定着して印字を行う印字方法において、前記レ
ジストローラの速度を前記定着ローラの速度よりも遅く
設定すると共に、用紙サイズを検出し、用紙サイズが小
さい程、前記像保持体に対する作像タイミングを遅くし
たことを特徴としている。
The present invention provides a printing method in which paper is guided to an image carrier by a registration roller, and a toner image transferred to the paper by the image carrier is fixed by a fixing roller to perform printing. The speed of the fixing roller is set to be lower than the speed of the fixing roller, and the paper size is detected, and the smaller the paper size, the slower the timing of image formation on the image holder.

立−−−里 上記の如く、サイズの小さい用紙程、作像タイミングを
遅くすると、像保持体上に形成される作像領域がその分
長くなるので、より大きいサイズの用紙を基準にして印
字長を長くできる方向にレジストローラ及び定着ローラ
の外径寸法を設定した場合に、搬送速度の向上に伴なう
効果の不足分を補えることになる。それ故、小サイズの
用紙に対して印字を行う場合にも、その印字長を理論値
に近づけることができる。
As mentioned above, if the image formation timing is delayed for smaller paper sizes, the image formation area formed on the image holder will be correspondingly longer, so printing will be performed based on larger paper sizes. When the outer diameter dimensions of the registration roller and the fixing roller are set in a direction that allows the length to be increased, it is possible to compensate for the lack of effectiveness due to an increase in the conveyance speed. Therefore, even when printing on small-sized paper, the print length can be made close to the theoretical value.

実−施一員 以下本発明の一実施例を図面に従って具体的に説明する
。第1図は本発明に係る印字方法をプリンタに適用した
場合の実施例を示す要部の断面図である。
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a sectional view of essential parts showing an embodiment in which the printing method according to the present invention is applied to a printer.

まず、プリンタの概略構成について説明する。First, the general configuration of the printer will be explained.

図外のプリントスイッチをオンすると、プリンタ本体の
中央部に設けられた感光体ドラム6が矢印Aで示す方向
に回転し、これに伴って帯電器lOが感光体ドラム6の
表面を帯電する。
When a print switch (not shown) is turned on, the photoreceptor drum 6 provided at the center of the printer body rotates in the direction shown by arrow A, and the charger IO charges the surface of the photoreceptor drum 6 accordingly.

そして、この時、読取光学系13が図外の原稿の原稿画
像を画像信号として読み取り、読み取った画像信号を、
例えばLEDアレイからなる光書き込みユニ・ノド11
に出力する。光書き込みユニット11はこの画像信号に
対応して発光し、感光体ドラム6の表面を露光する。か
くして、露光部に静電潜像が形成される。なお、読取光
学系13の露光タイくング、即ち書き込みタイミングは
制御装置14により制御される。制御装置14はプリン
タの作像工程全般を制御する。
At this time, the reading optical system 13 reads the original image of the original (not shown) as an image signal, and the read image signal is
For example, an optical writing unit 11 consisting of an LED array
Output to. The optical writing unit 11 emits light in response to this image signal and exposes the surface of the photosensitive drum 6. Thus, an electrostatic latent image is formed in the exposed area. Note that the exposure timing of the reading optical system 13, that is, the writing timing is controlled by the control device 14. A control device 14 controls the overall image forming process of the printer.

次いで、帯電器10の下流側(感光体ドラム6の回転方
向における下流側)に設けた現像器12が静電潜像にト
ナーを供給してトナー像を形成する。一方、かかる作像
工程に同期して給紙ローラ1が給紙カセット2内に収納
された用紙3を繰り出し、用紙分離袋W4に与える。用
紙分離装置4は用紙3を一枚ずつ捌いて最上位にある用
紙3をレジストローラ5に供給する。
Next, a developing device 12 provided downstream of the charger 10 (downstream in the rotational direction of the photoreceptor drum 6) supplies toner to the electrostatic latent image to form a toner image. Meanwhile, in synchronization with the image forming process, the paper feed roller 1 feeds out the paper 3 stored in the paper feed cassette 2 and supplies it to the paper separation bag W4. The paper separating device 4 separates the papers 3 one by one and supplies the uppermost paper 3 to the registration rollers 5.

なお、給紙カセット2の近傍部位には用紙3のサイズを
検出するサイズ検出センサSが設けられる。サイズ検出
センサSの検出結果は制御装置14に与えられる。制御
装置14は検出結果に従い前記光書き込みユニット11
の書き込みタイミングを制御する。より具体的には、用
紙3のサイズが小さい程、より遅い書き込みタイミング
で読取光学系13に書き込ませる。
Note that a size detection sensor S for detecting the size of the paper 3 is provided near the paper feed cassette 2. The detection result of the size detection sensor S is given to the control device 14. The control device 14 controls the optical writing unit 11 according to the detection result.
control the write timing. More specifically, the smaller the paper 3 is, the later the reading optical system 13 is caused to write at a later writing timing.

レジストローラ5は用紙3を感光体ドラム6と転写器7
との間に搬送する。この搬送動作は感光体ドラム6の近
傍部位に山形ガイド部9aを備えたペーパガイド9によ
り案内される。感光体ドラム6と転写器7との間に搬送
された用紙3にはトナー像が転写され、トナー像を転写
された用紙3は次に定着ローラ8の位置に搬送され、こ
こで定着工程が行われる。定着工程を終えた用紙3は図
外の排出ローラにより機外に排出される。
The registration roller 5 moves the paper 3 between the photosensitive drum 6 and the transfer device 7.
Transport between. This conveyance operation is guided by a paper guide 9 having a chevron-shaped guide portion 9a near the photosensitive drum 6. The toner image is transferred to the paper 3 conveyed between the photosensitive drum 6 and the transfer device 7, and the paper 3 with the toner image transferred thereto is then conveyed to the position of the fixing roller 8, where a fixing process is performed. It will be done. After the fixing process, the paper 3 is discharged to the outside of the machine by a discharge roller (not shown).

上記構成において、レジストローラ5の周速度は感光体
ドラム6のプロセス速度と同期し、且つ定着ローラ8の
周速度よりも遅く設定されている。
In the above configuration, the circumferential speed of the registration roller 5 is set to be synchronized with the process speed of the photosensitive drum 6 and slower than the circumferential speed of the fixing roller 8.

この設定は、具体的には、上記従来例のものと同様の定
着ローラ8を従来例同様の速度で回転させると共に、感
光体ドラム6の回転速度を少し小さく設定し、且つレジ
ストローラ5の外径寸法を上記従来例のレジストローラ
5の外径寸法よりも少し小さくし、従来例同様の回転速
度で回転させることにより実現される。かかる構成によ
り前記した黒すじ30の発生を防止できる。
Specifically, this setting involves rotating the fixing roller 8 similar to that of the conventional example described above at the same speed as the conventional example, setting the rotation speed of the photoreceptor drum 6 slightly lower, and This is achieved by making the diameter slightly smaller than the outer diameter of the registration roller 5 of the conventional example and rotating it at the same rotational speed as the conventional example. With this configuration, the occurrence of the black streaks 30 described above can be prevented.

加えて、上記の如く用紙3のサイズが小さくな 4゜れ
ばなる程、読取光学系13の書き込みタイミングを遅く
したことにより、上記作用の項で述べた理由により、A
4サイズ等の小サイズの用紙3に対して印字を行う場合
にもその印字長を理論値に近づけることができる。
In addition, as mentioned above, as the size of the paper 3 becomes smaller, the writing timing of the reading optical system 13 is delayed, so that A
Even when printing is performed on small size paper 3 such as size 4, the print length can be made close to the theoretical value.

なお、上記実施例ではレジストローラ5の外径寸法を定
着ローラ8の外径寸法よりも小さくしたが、両者の外径
寸法を同一にし、レジストローラ5の回転速度自体を遅
くする構成をとることもできる。
In the above embodiment, the outer diameter of the registration roller 5 is smaller than the outer diameter of the fixing roller 8, but the outer diameter of both rollers may be made the same and the rotational speed of the registration roller 5 itself may be slowed down. You can also do it.

また、上記実施例では本発明をプリンタに適用する場合
について説明したが、複写機等の他の画像形成装置につ
いても同様に適用できる。
Further, in the above embodiments, the case where the present invention is applied to a printer has been described, but the present invention can be similarly applied to other image forming apparatuses such as a copying machine.

光豐史劾且 以上の本発明による場合は、黒すじの発生を防止できる
ことは勿論のこと、用紙のサイズの大小にかかわらず、
用紙に対する印字長を理論値に近づけることが可能にな
る。それ故、印字品質を格段に向上できる。
According to the present invention described above, it is possible to prevent the occurrence of black streaks, and also to prevent the occurrence of black streaks, regardless of the size of the paper.
It becomes possible to bring the print length on paper closer to the theoretical value. Therefore, printing quality can be significantly improved.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明に係る印字方法をプリンタに適用した場
合の実施例を示す要部の断面図、第2図は従来のプリン
タを示す図面、第3図は従来技術の欠点を示す図面であ
る。 3・・・用紙、5・・・レジストローラ、6・・・感光
体ドラム、8・・・定着ローラ、13・・・読取光学系
、14・・・制御装置、S・・・サイズ検出センサ。
Fig. 1 is a cross-sectional view of the main parts showing an example of applying the printing method according to the present invention to a printer, Fig. 2 is a drawing showing a conventional printer, and Fig. 3 is a drawing showing the drawbacks of the conventional technology. be. 3... Paper, 5... Registration roller, 6... Photosensitive drum, 8... Fixing roller, 13... Reading optical system, 14... Control device, S... Size detection sensor .

Claims (1)

【特許請求の範囲】[Claims] (1)レジストローラにより用紙を像保持体に導き、像
保持体により用紙に転写されたトナー像を定着ローラに
より定着して印字を行う印字方法において、 前記レジストローラの速度を前記定着ローラの速度より
も遅く設定すると共に、用紙サイズを検出し、用紙サイ
ズが小さい程、前記像保持体に対する作像タイミングを
遅くしたことを特徴とする印字方法。
(1) In a printing method in which paper is guided to an image carrier by a registration roller, and the toner image transferred to the paper by the image carrier is fixed by a fixing roller to perform printing, the speed of the registration roller is the speed of the fixing roller. A printing method characterized in that the paper size is detected, and the smaller the paper size is, the later the image formation timing on the image holder is.
JP2034850A 1990-02-15 1990-02-15 Printing method Pending JPH03239577A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2034850A JPH03239577A (en) 1990-02-15 1990-02-15 Printing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2034850A JPH03239577A (en) 1990-02-15 1990-02-15 Printing method

Publications (1)

Publication Number Publication Date
JPH03239577A true JPH03239577A (en) 1991-10-25

Family

ID=12425659

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2034850A Pending JPH03239577A (en) 1990-02-15 1990-02-15 Printing method

Country Status (1)

Country Link
JP (1) JPH03239577A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008216738A (en) * 2007-03-06 2008-09-18 Konica Minolta Business Technologies Inc Image forming apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008216738A (en) * 2007-03-06 2008-09-18 Konica Minolta Business Technologies Inc Image forming apparatus

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