JPS6095576A - Transfer device of copying machine - Google Patents

Transfer device of copying machine

Info

Publication number
JPS6095576A
JPS6095576A JP20441183A JP20441183A JPS6095576A JP S6095576 A JPS6095576 A JP S6095576A JP 20441183 A JP20441183 A JP 20441183A JP 20441183 A JP20441183 A JP 20441183A JP S6095576 A JPS6095576 A JP S6095576A
Authority
JP
Japan
Prior art keywords
transfer
belt
image
toner
positive
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
JP20441183A
Other languages
Japanese (ja)
Inventor
Norio Kajiwara
梶原　紀夫
Toyoji Ishikawa
豊治 石川
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP20441183A priority Critical patent/JPS6095576A/en
Publication of JPS6095576A publication Critical patent/JPS6095576A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/163—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using the force produced by an electrostatic transfer field formed between the second base and the electrographic recording member, e.g. transfer through an air gap
    • G03G15/1635—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using the force produced by an electrostatic transfer field formed between the second base and the electrographic recording member, e.g. transfer through an air gap the field being produced by laying down an electrostatic charge behind the base or the recording member, e.g. by a corona device
    • G03G15/1645—Arrangements for controlling the amount of charge

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)

Abstract

PURPOSE:To prevent a belt from being stained by controlling an electrifier for transfer so that a toner image on a photosensitive body is not transferred in a no-image area and transferred only in an image area. CONSTITUTION:A latent image on the 1st photosensitive drum 4 is held at a positive (or negative) potential, the polarity of toner is made negative (or positive), and the corona polarity of a belt electrifier (pre-electrifier) 29 is made negative (or positive); and the electrifier 30 for transfer is turned off in a no- image area and its polarity is made positive (or negative) in an image area to prevent developing toner of a reference density pattern as an unknown toner image from sticking on the transfer belt 27. Namely, the corona polarity of the belt electrifier 29 is held under specific condition according to, for example, the potential of the latent image ang toner polarity, and the transfer charger 30 is turned on in the no-image area and turned on in the image area to transfer the toner image on the photosensitive drum 4 to transfer paper 41. Thus, an unnecessary toner image 42 (reference density pattern image, etc.) is prevented from sticking on the transfer belt 27.

Description

【発明の詳細な説明】 弦景奢■ 本発明は、転写ベルトを使用する複写機における転写ベ
ルト汚れ防止に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to prevention of staining of a transfer belt in a copying machine using a transfer belt.

°捉床韮庸 複写機において、原稿より手前の位置に基準濃度パター
ンを置き、これを感光体上に作像、現像してこの濃度を
測定し、基準濃度と比較することによりプロセス条件へ
フィードバックして、原稿の画像濃度を環境変動などに
対して一定であるようにコントロールする方式があるが
、転写ベルトを介して転写コロナをかけると、この濃度
パターンが転写ベルト上へ移るため、ベルト汚れが発生
していた。° In a captured bed copying machine, a reference density pattern is placed in front of the original, an image is created on the photoreceptor, the density is developed, and the density is measured. By comparing it with the reference density, it is fed back to the process conditions. There is a method to control the image density of the original so that it remains constant against environmental changes, etc., but when a transfer corona is applied via the transfer belt, this density pattern is transferred onto the transfer belt, which causes the belt to become dirty. was occurring.

１］年 本発明は、上記のようなベルト汚れ発生を防止しようと
するものである。1] The present invention aims to prevent the occurrence of belt stains as described above.

ｌ戊 第１図は、２色式電子写真複写装置の感光体ドラム周り
の構成を示す断面図で、この例では、二個の感光体ドラ
ムが用いられており、転写用紙は第１感光体ドラムに転
写ベルトにより移送され、転写後、該転写ベル（・によ
り次の第２感光体ドラムに移送されるようになっている
。Figure 1 is a sectional view showing the structure around the photoreceptor drum of a two-color electrophotographic copying device. In this example, two photoreceptor drums are used, and the transfer paper is attached to the first photoreceptor. The image is transferred to the drum by a transfer belt, and after being transferred, it is transferred to the next second photoreceptor drum by the transfer belt.

即ち、図示の実施例において、複写機のコンタクトガラ
ス上に載置された原稿（図示省略）よりの反射光と基準
濃度パターンよりの反射光とは、結像レンズ１を通り、
ハーフミラ−２により２つに分割され、通過光はミラー
３により反射されて有彩色用第１感光体ドラム４に、反
射光はミラー５．６により反射されて黒用第２感光体ド
ラム７にそれぞれ結像する。なお、符号８は防塵ガラス
、９はフィルターである。That is, in the illustrated embodiment, the reflected light from the original (not shown) placed on the contact glass of the copying machine and the reflected light from the reference density pattern pass through the imaging lens 1.
The light is divided into two parts by a half mirror 2, and the passing light is reflected by a mirror 3 onto a first photoreceptor drum 4 for chromatic colors, and the reflected light is reflected by a mirror 5.6 and sent to a second photoreceptor drum 7 for black. Each forms an image. In addition, the code|symbol 8 is a dust-proof glass, and 9 is a filter.

第１感光体トラム４の周りには、−次二次帯電器１０、
イレーザ１１、現像装置１２、濃度検知センサ１３、転
写前露光ランプ１４、転写ベルト装置１５、感光体クリ
ーニング装置１６、除電ランプ１７が設けられ、また、
第２感光体ドラム７の周りには、帯電器１８、イレーザ
１９．現像装置２０、濃度検知センサ２１、転写前露光
ランプ２２、転写分離帯電器２３、クリーニング前除電
器２４、クリーニング装置２５、除電ランプ２６が設け
られている。Around the first photoconductor tram 4, a negative secondary charger 10,
An eraser 11, a developing device 12, a density detection sensor 13, a pre-transfer exposure lamp 14, a transfer belt device 15, a photoreceptor cleaning device 16, and a static elimination lamp 17 are provided, and
Around the second photoreceptor drum 7, a charger 18, an eraser 19. A developing device 20, a density detection sensor 21, a pre-transfer exposure lamp 22, a transfer separation charger 23, a pre-cleaning static eliminator 24, a cleaning device 25, and a static eliminator lamp 26 are provided.

転写ベル１〜装置（誘電体ベルトユニット）１５の転写
ベルト２７は一対の駆動ローラ２８，２８に掛渡され、
矢印方向に駆動される。転写ベルト２７の上流外側位置
にベルト帯電器２９、第１感光体（複合感光体）ドラム
４に対面する内側に転写用帯電器３０、下流外側位置に
分離帯電器３１、下側内面にベルト除電器３２、外側に
ベルトクリーニング装置３３がそれぞれ配置されている
。なお、　３− 符号３４はベル１〜除電器３２の下に設けられたトナー
回収皿である。The transfer belt 27 of the transfer belt 1 to device (dielectric belt unit) 15 is wrapped around a pair of drive rollers 28, 28,
It is driven in the direction of the arrow. A belt charger 29 is provided at the upstream outer side of the transfer belt 27, a transfer charger 30 is provided at the inner side facing the first photoreceptor (composite photoreceptor) drum 4, a separation charger 31 is provided at the downstream outer position, and a belt charger is provided at the lower inner surface. An electric appliance 32 and a belt cleaning device 33 are arranged on the outside. Note that 3- numeral 34 is a toner collection tray provided below the bell 1 to the static eliminator 32.

給紙カセット３５に収容されている転写用紙は、給紙コ
ロ３６、セパレートローラ３７、リバースローラ３８、
レジストローラ対３９により転写ベルト２７に案内され
、この転写ベルト２７により移送されて、第１感光体ド
ラム４より有彩色の画像を転写され、隣りの第２感光体
ドラム７に送られてさらに黒の画像を転写される。なお
、符号４０は紙検知センサである。The transfer paper stored in the paper feed cassette 35 is transferred to a paper feed roller 36, a separate roller 37, a reverse roller 38,
It is guided by a pair of registration rollers 39 to a transfer belt 27, transferred by this transfer belt 27, a chromatic image is transferred from the first photoreceptor drum 4, and then sent to the adjacent second photoreceptor drum 7, where it is further transferred to a black image. image is transferred. Note that the reference numeral 40 is a paper detection sensor.

ところで、第１感光体ドラム４上には原稿の画像の外に
基準濃度パターンの画像も投影され、トナーにより顕像
化されるが、原稿の分は転写用紙に転写されるけれども
、基準濃度パターンの分は単に濃度検知センサ１３によ
り、現像剤トナー濃度制御等のために、その濃淡検知が
行われるだけで、転写用紙には転写されずに、転写ベル
ト２７を介して転写コロナが掛けられるため、基準濃度
パターンの画像が転写ベルト２７に転写されることにな
る。この転写ベルト上に転写されたトナー４− は、ベルト除電器３２、ベルトクリーニング装置３３に
より除去され、トナー回収皿３４に落下回収されること
になるが、これではベルトクリーニング装置３３に負荷
が掛り過ぎ、どうしてもベルト汚染が発生する。Incidentally, in addition to the original image, an image of a reference density pattern is also projected onto the first photoreceptor drum 4 and visualized with toner. The density detection sensor 13 simply detects the density of the toner to control the developer and toner concentration, and the transfer corona is applied via the transfer belt 27 without being transferred to the transfer paper. , the image of the reference density pattern is transferred onto the transfer belt 27. The toner 4- transferred onto the transfer belt is removed by the belt static eliminator 32 and the belt cleaning device 33, and falls onto the toner collection tray 34 to be collected. However, this places a load on the belt cleaning device 33. Otherwise, belt contamination will inevitably occur.

本発明はこのような欠点を解消しようとするものである
。即ち、第１感光体ドラム４上の潜像の電位を正（また
は負）とし、トナーの極性を負（または正）とし、ベル
ト帯電器（予帯電器）２９のコロナ極性を負（または正
）とするとともに、転写用帯電器３０を非画像域ではＯ
ＦＦにし、画像域では正（または負）とすることにより
、不用のトナー像である基準濃度パターンの顕像トナー
が転写ベルト２７に付着しないようにするものである。The present invention seeks to eliminate these drawbacks. That is, the potential of the latent image on the first photoreceptor drum 4 is set to positive (or negative), the polarity of the toner is set to negative (or positive), and the corona polarity of the belt charger (pre-charger) 29 is set to negative (or positive). ), and the transfer charger 30 is set to O in the non-image area.
By setting it to FF and setting it to positive (or negative) in the image area, it is possible to prevent the developed toner of the reference density pattern, which is an unnecessary toner image, from adhering to the transfer belt 27.

即ち、例えば転写行程を示す第２図（ａ）（ｂ）のよう
に、潜像の電位、トナー極性に応じてベルト帯電器２９
のコロナ極性を一定条件としておき、転写用帯電器３０
を非画像部域ではＯＦＦとし、画像域ではＯＮとして、
感光体ドラム４上のトナー像を転写紙４１に転写する。That is, for example, as shown in FIGS. 2(a) and 2(b) showing the transfer process, the belt charger 29 is activated depending on the potential of the latent image and the toner polarity.
With the corona polarity set as a constant condition, the transfer charger 30
is set to OFF in the non-image area and ON in the image area,
The toner image on the photosensitive drum 4 is transferred onto a transfer paper 41.

このようにして、不要のトナー像４２（基準濃度パター
ン像等）を転写ベルト２７に付着させないようにする。In this way, unnecessary toner images 42 (reference density pattern images, etc.) are prevented from adhering to the transfer belt 27.

また、上記ベルト帯電器（予帯電器）２９は、転写用紙
を転写ベルト２７に付着させて搬送を確実に行わせるた
めのものであるので、転写用紙の搬送が何か他の手段で
確実に行われる場合には、第１図の一部を示す第３図の
ように、ベルト帯電器２９を省略できる。この場合は、
第１感光体ドラム４上の潜像の電位を正（または負）と
し、トナーの極性を負（または正）とし、転写用帯電器
３０を非画像域では負（または正）にし、画像域で正（
または負）とすればよい。即ち、例えば転写行程を示す
第４図（ａ）（ｂ）のように、潜像の電位、トナー極性
に応じて転写用帯電器３０の極性を切り換えて、感光体
ドラム上のトナー像を転写紙４１に転写するものである
。このようにして、非画像部域ではトナー極性と同極性
とし、画像域ではトナー極性と逆極性として転写用帯電
器３０に入力をして、不要のトナー像を転写ベルトに付
着させないようにする。Furthermore, since the belt charger (pre-charger) 29 is used to ensure that the transfer paper is transported by adhering it to the transfer belt 27, it is necessary to ensure that the transfer paper is transported by some other means. If this is done, the belt charger 29 can be omitted, as shown in FIG. 3, which shows a part of FIG. in this case,
The potential of the latent image on the first photoreceptor drum 4 is set positive (or negative), the polarity of the toner is set negative (or positive), the transfer charger 30 is set negative (or positive) in the non-image area, and the polarity of the toner is set negative (or positive) in the non-image area. So correct (
or negative). That is, for example, as shown in FIGS. 4(a) and 4(b) showing the transfer process, the toner image on the photosensitive drum is transferred by switching the polarity of the transfer charger 30 according to the potential of the latent image and the toner polarity. It is to be transferred onto paper 41. In this way, the polarity is the same as the toner polarity in the non-image area, and the polarity opposite to the toner polarity is inputted to the transfer charger 30 in the image area, thereby preventing unnecessary toner images from adhering to the transfer belt. .

宿り艮 ２色複写機においては、転写用紙を第１感光体ドラム４
．第２感光体ドラム７の回転に同期させて、画像を重ね
合せて正確に転写する必要上、ベルト帯電器２９を設け
た転写ベル１〜装置を用いて転写用紙を移送するように
なっているが、転写ベルトに基準濃度パターンの画像ト
ナーが転写され、ベルトクリーニング装置に負荷が掛り
過ぎ、したがって、転写ベルト２７に汚れが残るという
欠点があったが、本発明によれば、基準濃度パターンの
画像トナーは転写ベルトに転写されずに感光体ドラム上
に残り、クリーニング性能の高い感光体クリーニング装
置１６によりクリーニングされることになるので、転写
ベルト２７の汚れ発生を防止することができる。In a two-color copying machine, the transfer paper is transferred to the first photoreceptor drum 4.
．． Since it is necessary to overlay and transfer images accurately in synchronization with the rotation of the second photosensitive drum 7, the transfer paper is transferred using a transfer bell 1 to a device provided with a belt charger 29. However, according to the present invention, the image toner of the reference density pattern is transferred to the transfer belt, which places too much load on the belt cleaning device, and therefore leaves stains on the transfer belt 27. However, according to the present invention, the image toner of the reference density pattern is transferred to the transfer belt. Since the image toner remains on the photoreceptor drum without being transferred to the transfer belt and is cleaned by the photoreceptor cleaning device 16 with high cleaning performance, it is possible to prevent the transfer belt 27 from becoming stained.

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

第１図は２色複写機における本発明による実施例を示す
もので、複写機の感光体ドラム周辺の配置を示す断面図
、第２図（ａ）　（ｂ）は第１図実施例における転写行
程図を示す説明図、第３図は別実施７− 例を示す第１図の一部分図、第４図（ａ）（ｂ）は第３
図実施例における転写行程を示す説明図、である。 ｌ・・・結像レンズ、２・・・ハーフミラ−１３，５゜
６・・・ミラー、４・・・第１感光体ドラム、７・・・
第２感光体ドラム、ＩＯ・・・帯電器、Ｉ２・・・現像
装置、１３・・・濃度検知センサ、１５・・・転写ベル
ト装置、１６・・・感光体クリーニング装置、２７・・
・転写ベルト、２８．２８・・・駆動ローラ、２９・・
・ベルト帯電器、３０・・・転写用帯電器、３１・・・
分離帯電器、３２・・・ベルト除電器、３３・・・ベル
トクリーニング装置、３４・・・トナー回収皿、３５・
・・給紙カセット、３９・・・レジストローラ対、４ｏ
・・・紙検知センサ、４１・・・転写紙、４２・・・不
要のトナー像。 代理人　弁理士　今　誠 ８−FIG. 1 shows an embodiment of the present invention in a two-color copying machine, and is a sectional view showing the arrangement around the photosensitive drum of the copying machine, and FIGS. An explanatory drawing showing a process diagram, Fig. 3 is a partial view of Fig. 1 showing another example, and Fig. 4 (a) and (b) are
It is an explanatory view showing a transfer process in a figure example. l...Imaging lens, 2...Half mirror 13,5°6...Mirror, 4...First photosensitive drum, 7...
2nd photoconductor drum, IO... Charger, I2... Developing device, 13... Density detection sensor, 15... Transfer belt device, 16... Photoconductor cleaning device, 27...
・Transfer belt, 28. 28... Drive roller, 29...
・Belt charger, 30...Transfer charger, 31...
Separation charger, 32... Belt static eliminator, 33... Belt cleaning device, 34... Toner collection tray, 35...
... Paper feed cassette, 39... Registration roller pair, 4o
. . . Paper detection sensor, 41 . . . Transfer paper, 42 . . . Unnecessary toner image. Agent Patent Attorney Makoto Kon 8-

Claims (3)

【特許請求の範囲】[Claims] （１）　感光体と、これに接する転写ベルトと、転写ベ
ルトを介して感光体の対向側に配置された転写用帯電器
とを備えた転写装置において、感光体上のトナー像が非
画像域では転写が行われず、画像域でのみ転写が行われ
るよう、転写用帯電器の制御を行うようにしたことを特
徴とする複写機における転写装置。(1) In a transfer device equipped with a photoreceptor, a transfer belt in contact with the photoreceptor, and a transfer charger disposed on the opposite side of the photoreceptor with the transfer belt interposed therebetween, the toner image on the photoreceptor is A transfer device for a copying machine, characterized in that a transfer charger is controlled so that transfer is not performed but only in an image area. （２）感光体と、これに接する転写ベルトと、転写ベル
トを介して感光体の対向側に配置された転写用帯電器と
、該帯電器の上流で用紙を転写ベルトに付着させるため
のベルト帯電器とを備えた転写装置において、潜像の電
位を正（または負）、トナーの極性を負（または正）、
ベルト帯電器のコロナ極性を負（または正）とするとと
もに、転写用帯電器を非画像域ではＯＦＦにし、画像域
で正（または負）とすることを特徴とする特許請求の範
囲第１項記載の複写機における転写装置。(2) A photoreceptor, a transfer belt in contact with the photoreceptor, a transfer charger placed on the opposite side of the photoreceptor via the transfer belt, and a belt for attaching paper to the transfer belt upstream of the charger. In a transfer device equipped with a charger, the potential of the latent image is positive (or negative), the polarity of the toner is negative (or positive),
Claim 1, characterized in that the corona polarity of the belt charger is negative (or positive), and the transfer charger is turned off in non-image areas and positive (or negative) in image areas. A transfer device in the described copying machine. （３）感光体と、これに接する転写ベルトと、転写ベル
トを介して感光体の対向側に配置された転写用帯電器と
を備えた転写装置において、潜像の電位を正（または負
）、トナーの極性を負（または正）とするとともに、転
写用帯電器を非画像域では負（または正）にし、画像域
で正（または負）とすることを特徴とする特許請求の範
囲第１項記載の複写機における転写装置。(3) In a transfer device equipped with a photoconductor, a transfer belt in contact with the photoconductor, and a transfer charger disposed on the opposite side of the photoconductor with the transfer belt in between, the potential of the latent image is set to positive (or negative). , the polarity of the toner is negative (or positive), and the transfer charger is negative (or positive) in a non-image area and positive (or negative) in an image area. A transfer device in a copying machine according to item 1.
JP20441183A 1983-10-31 1983-10-31 Transfer device of copying machine Pending JPS6095576A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20441183A JPS6095576A (en) 1983-10-31 1983-10-31 Transfer device of copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20441183A JPS6095576A (en) 1983-10-31 1983-10-31 Transfer device of copying machine

Publications (1)

Publication Number Publication Date
JPS6095576A true JPS6095576A (en) 1985-05-28

Family

ID=16490095

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20441183A Pending JPS6095576A (en) 1983-10-31 1983-10-31 Transfer device of copying machine

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Country Link
JP (1) JPS6095576A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01234874A (en) * 1988-03-15 1989-09-20 Bando Chem Ind Ltd Transferring and conveying device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01234874A (en) * 1988-03-15 1989-09-20 Bando Chem Ind Ltd Transferring and conveying device

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