JP3006101B2 - Transfer device for image forming device - Google Patents

Transfer device for image forming device

Info

Publication number
JP3006101B2
JP3006101B2 JP3011496A JP1149691A JP3006101B2 JP 3006101 B2 JP3006101 B2 JP 3006101B2 JP 3011496 A JP3011496 A JP 3011496A JP 1149691 A JP1149691 A JP 1149691A JP 3006101 B2 JP3006101 B2 JP 3006101B2
Authority
JP
Japan
Prior art keywords
transfer
image
voltage
roller
current
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.)
Expired - Lifetime
Application number
JP3011496A
Other languages
Japanese (ja)
Other versions
JPH04251276A (en
Inventor
耕一 谷川
貴康 弓納持
康正 大塚
裕志 笹目
浩人 長谷川
竹内  昭彦
秀幸 矢野
秀夫 七瀧
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP3011496A priority Critical patent/JP3006101B2/en
Publication of JPH04251276A publication Critical patent/JPH04251276A/en
Application granted granted Critical
Publication of JP3006101B2 publication Critical patent/JP3006101B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は、電子写真法・静電記録
法・磁気記録法などその他従来公知の適宜の作像プロセ
ス手段により電子写真感光体・静電記録誘電体・磁気記
録磁性体等の第1の画像担持体上に形成させた可転写像
を紙・プラスチックシート等の第2の画像担持体に転写
する装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic photosensitive member, an electrostatic recording dielectric, a magnetic recording magnetic material, and other suitable image forming process means such as electrophotography, electrostatic recording, and magnetic recording. The present invention relates to an apparatus for transferring a transferable image formed on a first image carrier such as a paper to a second image carrier such as paper or a plastic sheet.

【0002】より詳しくは、可転写像を形成した第1の
画像担持体上に第2の画像担持体を重ねて該第2の画像
担持体の背面に転写手段により電荷を付与して可転写像
を第2の画像担持体に転写する、画像形成装置の転写装
置に関する。
More specifically, a second image carrier is superimposed on a first image carrier on which a transferable image has been formed, and a charge is applied to the back surface of the second image carrier by a transfer means to enable transfer. The present invention relates to a transfer device of an image forming apparatus that transfers an image to a second image carrier.

【0003】[0003]

【従来の技術】図5は従来の画像形成装置における転写
装置の一例を示す概要図であり、第1の画像担持体とし
ての電子写真感光ドラム1は矢印方向に所定の周速度
(プロセススピード)をもって回転駆動されて、一次帯
電ローラ2により一様に帯電された後、画像露光3を受
けて静電潜像が形成される。次いで現像器4により荷電
粒子であるトナー5が静電潜像に応じて付与されて可転
写の顕像6が形成される。
2. Description of the Related Art FIG. 5 is a schematic view showing an example of a transfer device in a conventional image forming apparatus. An electrophotographic photosensitive drum 1 as a first image carrier has a predetermined peripheral speed (process speed) in the direction of an arrow. , And is uniformly charged by the primary charging roller 2, and receives an image exposure 3 to form an electrostatic latent image. Next, the developing device 4 applies the toner 5 as charged particles in accordance with the electrostatic latent image to form a transferable visible image 6.

【0004】一方、不図示の給紙部から第2の画像担持
体である転写材7が、感光ドラム1上の顕像6のドラム
回転による移動と同期して転写手段としての転写ローラ
8と感光ドラム1のニップ部に送り込まれ、電源10に
より芯金9を介して転写ローラ8に印加されたバイアス
電圧の作用によって転写材7の裏面にトナー5とは逆極
性の電荷が付与され、この電荷によって感光ドラム1の
顕像6が転写材7へ転写される。
On the other hand, a transfer material 7, which is a second image carrier, is transferred from a paper feed unit (not shown) to a transfer roller 8 as a transfer unit in synchronization with the movement of the developed image 6 on the photosensitive drum 1 by the rotation of the drum. The toner is fed into the nip portion of the photosensitive drum 1, and the reverse voltage of the toner 5 is applied to the back surface of the transfer material 7 by the action of a bias voltage applied to the transfer roller 8 via the metal core 9 by the power supply 10. The visible image 6 of the photosensitive drum 1 is transferred to the transfer material 7 by the electric charge.

【0005】転写後、転写材7の裏面の過剰電荷は除電
針13により除かれ、転写材7は転写された顕像を載せ
て図示せぬ定着器に送り込まれ、顕像は転写材7に永久
定着される。そして、転写部通過後の感光ドラム1面は
転写残りのトナーをクリーニング装置14で払拭されて
清浄面化され再び画像形成に供される。
After the transfer, the excess charge on the back surface of the transfer material 7 is removed by a static elimination needle 13, and the transferred material 7 is sent to a fixing device (not shown) with the transferred visual image thereon. It is permanently fixed. After passing through the transfer section, the surface of the photosensitive drum 1 is wiped off by a cleaning device 14 to remove the toner remaining after transfer, and is cleaned to be used again for image formation.

【0006】本出願人は上記転写ローラ8のバイアス電
圧に関して、環境条件が変化しても常に良好な転写性能
を得ることのできる自動転写電圧制御方式(以後、AT
VC方式と称する)を特願昭63−27610号として
先に提案した。このATVC方式は画像形成工程に先立
って、感光ドラム1を前回転させ、この前回転時に転写
ローラ8にバイアス電圧を印加し、このときの出力電流
値を電流計11で測定し、この測定値をコントローラ1
2にフィードバックする。そして、上記出力電流値が所
定の値となるように電源10のバイアス電圧をコントロ
ーラ12により調整して、その調整された電圧そのまま
の値或はそれを係数等で補正した値の定電圧を転写時に
転写ローラ8に印加するもので、転写ローラ8のインピ
ーダンスが環境により大きく変動しても、常に適正な定
電圧特性の転写バイアスを得ることができる。
The applicant of the present invention has proposed an automatic transfer voltage control system (hereinafter referred to as AT) which can always obtain good transfer performance even when environmental conditions change with respect to the bias voltage of the transfer roller 8.
VC method) was previously proposed as Japanese Patent Application No. 63-27610. In the ATVC method, prior to the image forming process, the photosensitive drum 1 is pre-rotated, a bias voltage is applied to the transfer roller 8 during the pre-rotation, and an output current value at this time is measured by an ammeter 11, and the measured value is measured. To controller 1
Give feedback to 2. The controller 12 adjusts the bias voltage of the power supply 10 so that the output current value becomes a predetermined value, and transfers a constant voltage of the adjusted voltage as it is or a value obtained by correcting the same with a coefficient or the like. Sometimes, the transfer bias is applied to the transfer roller 8, so that even if the impedance of the transfer roller 8 greatly changes due to the environment, a transfer bias having an appropriate constant voltage characteristic can always be obtained.

【0007】[0007]

【発明が解決しようとする課題】しかしながら、上記従
来装置では感光ドラム1と転写ローラ8を直接接触させ
た状態での電流値を所定値になるように、転写ローラ8
に印加する定電圧バイアスを調整していたため、1)転
写材7のインピーダンスが高い場合(例えば厚手紙を用
いる場合や一旦プリントした転写材7の裏面にプリント
しようとする場合)2)転写ローラ8のインピーダンス
が低い場合などに転写不良を生じるという不具合があっ
た。
However, in the above-described conventional apparatus, the transfer roller 8 is controlled so that the current value when the photosensitive drum 1 is in direct contact with the transfer roller 8 becomes a predetermined value.
1) When the impedance of the transfer material 7 is high (for example, when using a thick letter or when trying to print on the back surface of the once-printed transfer material 7) 2) The transfer roller 8 However, there is a problem that transfer failure occurs when the impedance is low.

【0008】この不具合を図6に示す転写ローラ8にバ
イアス電圧を印加する電源の電圧−電流特性曲線図につ
いて説明する。図6において、曲線Aは感光ドラム1と
転写ローラ8を直接接触させて回転させた時の転写ロー
ラ8のバイアス電圧Vと出力電流Iの関係を示す曲線で
あり、ここでは前回転中に出力電流I0 を得るような電
圧V0 が求められ、画像形成工程中の転写工程において
は、この電圧V0 が転写ローラ8の定電圧バイアスとし
て用いられる。
This disadvantage will be described with reference to a voltage-current characteristic diagram of a power supply for applying a bias voltage to the transfer roller 8 shown in FIG. In FIG. 6, a curve A is a curve showing the relationship between the bias voltage V and the output current I of the transfer roller 8 when the photosensitive drum 1 and the transfer roller 8 are brought into direct contact and rotated. the voltage V 0 so as to obtain a current I 0 is determined, in the transfer step in the image forming process, the voltage V 0 is used as a constant voltage bias of the transfer roller 8.

【0009】転写材7として紙が用いられ、紙aが感光
ドラム1と転写ローラ8の間に挟まれた状態でのV−I
曲線は曲線P1のようになるので、定電圧バイアスV0
が加えられるとき、転写電流はI1 となる。問題となる
のは転写電流I1 が十分な量確保されるか否かである
が、図6に示すように、臨界転写電流値IL よりも転写
電流I1 は大きいので、この場合は良好な転写が行なわ
れる。
Paper is used as the transfer material 7, and the paper a is sandwiched between the photosensitive drum 1 and the transfer roller 8.
Since the curve is a curve P 1, a constant voltage bias V 0
When is added, the transfer current is I 1. The problem is whether or not a sufficient amount of the transfer current I 1 is ensured. However, as shown in FIG. 6, since the transfer current I 1 is larger than the critical transfer current value I L , in this case, Transfer is performed.

【0010】ところが、インピーダンスの大きな転写
材、例えば厚手紙bが用いられるような場合には、V−
I特性は曲線P2となってV軸により近づくために、バ
イアス電圧V0では転写電流はI2しか流れず、I2<I
L となって転写不良を生ずることになる。
However, when a transfer material having a large impedance, for example, a thick letter b is used, V-
Since the I characteristic becomes a curve P 2 and approaches the V axis, the transfer current flows only at I 2 at the bias voltage V 0 , and I 2 <I
It becomes L and a transfer failure occurs.

【0011】図6において、曲線A′は転写ローラ8の
インピーダンスが曲線Aよりも小さい場合のV−Iと特
性を示すもので、このとき前回転中の所定電流値I0
対応する電圧はV0 ′となり、転写時に印加される定電
圧バイアス値はV0′となる。すると、紙aにおいても
転写電流は臨界転写電流値ILを下回るようになり、転
写不良を生ずることになる。なお実際には曲線A′に対
応するものとして、曲線P1 、P2 をV軸よりやや遠
ざかる曲線として現われるが、実線との差は少ないので
説明の簡略化のために、省略した。
In FIG. 6, a curve A 'shows VI and characteristics when the impedance of the transfer roller 8 is smaller than the curve A. At this time, the voltage corresponding to the predetermined current value I 0 during the previous rotation is V 0 ′, and the constant voltage bias value applied at the time of transfer is V 0 ′. Then, even the transfer current in the paper a is now below the critical transfer current value I L, thereby causing defective transfer. Actually, the curves P 1 and P 2 appear as curves slightly away from the V-axis as corresponding to the curve A ′, but are omitted for simplicity of description because there is little difference from the solid line.

【0012】転写性能を確保する上では、転写材7への
電荷の十分な供給、つまり電流値I1、I2を臨界転写電
流値IL以上に確保することが必要なことであるが、従
来のATVC方式では前回転時の電流値I0と転写時の
電流値I1(又はI2 )が一定の比例関係にあることを
前提しているために、転写材7のインピーダンスが変化
したり、転写ローラ8のインピーダンスが変化すると、
上述のように転写不良が生ずることを免れなかった。
[0012] In order to ensure the transfer performance, adequate supply of charge to the transfer material 7, i.e. it is that required to ensure the current value I 1, I 2 above the critical transfer current value I L, In the conventional ATVC system, since it is assumed that the current value I 0 during the pre-rotation and the current value I 1 (or I 2 ) during the transfer are in a certain proportional relationship, the impedance of the transfer material 7 changes. Or the impedance of the transfer roller 8 changes,
As described above, the occurrence of transfer failure was inevitable.

【0013】本発明は上記のような問題を解消すること
を課題になされたもので、転写不良を生じないようにし
た転写装置を得ることを目的とする。
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a transfer apparatus which does not cause a transfer failure.

【0014】[0014]

【課題を解決するための手段】本発明は、画像担持体上
の顕像を転写手段により転写材に静電的に転写する転写
装置において、転写材の先端部で電源により転写手段に
定電圧を印加し、この時の電源の出力電流を検知し、こ
の検知電流を用いて決められた転写電圧で先端部以降の
転写動作を行なうことを特徴とする画像形成装置の転写
装置、を要旨とする。
SUMMARY OF THE INVENTION The present invention relates to a transfer apparatus for electrostatically transferring a visible image on an image carrier to a transfer material by a transfer means. And a transfer device of the image forming apparatus, which detects an output current of the power supply at this time, and performs a transfer operation after the leading end with a transfer voltage determined using the detected current. I do.

【0015】〈作 用〉 すなわち、転写材の先端部で電源により転写手段に定電
圧を印加し、この時の電源の出力電流を検知し、この検
知電流を用いて決められた転写電圧で先端部以降の転写
動作を行なうことにより、転写手段や転写材の抵抗値が
変化しても適正な転写動作を行なえる。
<Operation> That is, a constant voltage is applied to the transfer means by the power supply at the leading end of the transfer material, the output current of the power supply at this time is detected, and the transfer current determined by using the detected current is used. By performing the transfer operation after the copy section, an appropriate transfer operation can be performed even if the resistance value of the transfer unit or the transfer material changes.

【0016】[0016]

【実施例】〈実施例1〉図1は第1実施例装置の要部の
断面図を示し、前記図5の従来装置の同一部分には同一
符号を付して重複説明を省略する。転写材7は、矢印方
向に搬送されるものとし、その転写材7が進行方向先端
から距離l0を感光ドラム1と転写ローラ8に挟まれて
移動する間に、電流計11により電源10からの出力電
流が測定される。
<Embodiment 1> FIG. 1 is a sectional view of a main part of a first embodiment of the apparatus, in which the same parts as those of the conventional apparatus of FIG. The transfer material 7 is conveyed in the direction of the arrow. While the transfer material 7 is moved by a distance l 0 from the leading end in the traveling direction while being sandwiched between the photosensitive drum 1 and the transfer roller 8, the ammeter 11 supplies the transfer material 7 from the power source 10. Is measured.

【0017】この測定結果はコントローラ12に送ら
れ、距離l0 にわたって平均された電流値I2が得られ
る。コントローラ12はこの電流値I2が転写不良を生
ずる臨界電流値IL よりも小さい場合には、電源10の
出力電圧を上昇させて転写に十分な電流値Ilを得るよ
うにする。
The result of the measurement is sent to the controller 12 to obtain a current value I 2 averaged over the distance l 0 . The controller 12 the current value I 2 is smaller than the critical current value I L causing defective transfer raises the output voltage of the power source 10 so as to obtain a sufficient current value I l in transcription.

【0018】図2は上記コントローラ12の制御によ
り、転写材7の先端からの距離Lに応じた出力電圧Vと
出力電流Iの推移の様子を示す。ここで、当初の印加電
圧V0に関しては予め決められた一定値を用いるか、或
は前述したATVC方式により求められた電圧値を用い
れば良い。
FIG. 2 shows how the output voltage V and the output current I change according to the distance L from the leading end of the transfer material 7 under the control of the controller 12. Here, as the initial applied voltage V 0 , a predetermined constant value may be used, or a voltage value obtained by the above-mentioned ATVC method may be used.

【0019】なお、上述の場合、転写材7の先端から距
離l0までに亘っては転写不良を生ずることになるが、
距離l0を十分小さく取ることによって、大方のプリン
トの場合にはそこに印字されることが無い領域を用いて
上述の制御を行なえばよい。又EDP出力などにおいて
は、本文の前に印字量が極めて少ないヘッダープリント
を排出するような例があるが、そうした場合には、この
ヘッダープリントの余白部を用いて上述の制御を行なえ
ば良い。連続プリントにおいては、1枚目のプリント時
に得られた適正電圧値を2枚目以降にも適用すれば良い
ことはいうまでもない。
In the above case, a transfer failure occurs over a distance l 0 from the leading end of the transfer material 7,
By taking the distance l 0 sufficiently small, it may be performed to control the above using region that is not to be printed therein to a large extent of print. In addition, in the case of EDP output or the like, there is an example in which a header print having a very small print amount is discharged before the text. In such a case, the above-described control may be performed using a margin portion of the header print. In the continuous printing, it goes without saying that the appropriate voltage value obtained at the time of printing the first sheet may be applied to the second and subsequent sheets.

【0020】実験例 感光ドラム1として、外径30mmのアルミニウムシリ
ンダー上に有機半導体を形成したものを用い、周速50
mm/secで回転させ、帯電ローラ2により暗部電位
−600Vに一様に帯電させた。次いで、画像露光3に
より明部電位−150Vを得るようにし、画像露光3を
適宜パターンとして潜像を形成した後、現像器4により
反転現像を行なって明部にトナー5を付与させて顕像6
を得た。トナー5の体積平均粒径は6.5μ、平均荷電
量は10μc/grのものを用いた。転写ローラ8とし
て、外径8mmのステンレス製の芯金9の上にEPDM
中に金属酸化物を分散させた比抵抗約108 Ω・cmで
アスカーC硬度30°の弾性層を形成して外径20mm
としたものを用いた。この転写ローラ8を総圧1000
grで感光ドラム1に押しつけ、約2mmのニップを形
成して、一旦片面にプリントを終えたインピーダンスの
高い転写材(紙b)の裏面に転写を行なった。
Experimental Example A photosensitive drum 1 having an organic semiconductor formed on an aluminum cylinder having an outer diameter of 30 mm was used.
The roller was rotated at a speed of mm / sec, and charged uniformly by the charging roller 2 to a dark area potential of −600 V. Then, a bright portion potential of -150 V is obtained by image exposure 3, and a latent image is formed by using the image exposure 3 as an appropriate pattern. Then, reverse development is performed by a developing device 4 to apply toner 5 to the bright portion, thereby developing a visible image. 6
I got The toner 5 had a volume average particle size of 6.5 μm and an average charge amount of 10 μc / gr. As a transfer roller 8, an EPDM is placed on a stainless steel core 9 having an outer diameter of 8 mm.
An elastic layer having a specific resistance of about 10 8 Ω · cm and an Asker C hardness of 30 ° with a metal oxide dispersed therein was formed, and the outer diameter was 20 mm.
Was used. The transfer roller 8 is moved to a total pressure of 1000
Gr was pressed against the photosensitive drum 1 to form a nip of about 2 mm, and the image was transferred to the back surface of a high-impedance transfer material (paper b) once printed on one side.

【0021】まず、参照例として、従来のATVC方式
により、I0=10μAに応じてV0=1.7KVを得
て、これで紙bへ転写したところ、転写電流はI2
2.5μAとなり、臨界転写電流値IL=3μAに満た
ず、転写不良を生じ、文字の回りの飛び散りやハーフト
ン画像の乱れが発生した。
First, as a reference example, V 0 = 1.7 KV was obtained according to I 0 = 10 μA according to the conventional ATVC method, and was transferred to paper b. With this, the transfer current was I 2 =
2.5 μA, which was less than the critical transfer current value I L = 3 μA, resulting in poor transfer, scattering around characters and disturbance of halftone images.

【0022】本実施例によって、転写材7の先端からl
0=30mmにおいて、I2=2.5μAを検出したの
ち、電流I1がI1=4μAとなるように電源10の出力
電圧をV0=1.7KVからV1=2.5KVに制御し
た。こうして転写を行なったところ、上述参照例のよう
な転写不良は発生しなかった。 〈実施例2〉図3は第2実施例装置の要部の平面図であ
り、前記図1と同一部分には同一符号を付し重複を省略
する。図3において、7及び7aはともに転写材を示す
が、転写材7は転写ローラ8の全長を覆う幅を有してい
るのに対して、転写材7aは転写材7よりも狭幅であ
り、転写工程においては、転写ローラ8と感光ドラム1
が直接に接する部分W1、W2が生ずる。
According to the present embodiment, l
After detecting I 2 = 2.5 μA at 0 = 30 mm, the output voltage of the power supply 10 was controlled from V 0 = 1.7 KV to V 1 = 2.5 KV so that the current I 1 would be I 1 = 4 μA. . When the transfer was performed in this manner, no transfer failure as in the reference example described above occurred. <Embodiment 2> FIG. 3 is a plan view of a main part of a device according to a second embodiment. The same parts as those in FIG. In FIG. 3, reference numerals 7 and 7a denote transfer materials. The transfer material 7 has a width covering the entire length of the transfer roller 8, whereas the transfer material 7a is narrower than the transfer material 7. In the transfer step, the transfer roller 8 and the photosensitive drum 1
There occurs moiety W 1, W 2 in direct contact.

【0023】この接触部分W1、W2においては、転写材
7aを介した部分よりも電流は流れ易く、電流計11の
測定値からは直接感光ドラム1に流れる電流分を差し引
いて、転写材7aを介して流れる電流値を算定し、それ
を基準値と比べて制御する必要がある。
In the contact portions W 1 and W 2 , the current flows more easily than the portion via the transfer material 7 a, and the current flowing directly to the photosensitive drum 1 is subtracted from the value measured by the ammeter 11 to obtain the transfer material. It is necessary to calculate the value of the current flowing through 7a and control it by comparing it with a reference value.

【0024】これを図3で説明すると、印加電圧V0
おいて、転写ローラ8の全幅W0が感光ドラム1に接し
たときは電流値I0を得るので、幅W1、W2を通して流
れる電流値は I0×((W1+W2) /W0)となる。
Referring to FIG. 3, the current value I 0 is obtained when the entire width W 0 of the transfer roller 8 is in contact with the photosensitive drum 1 at the applied voltage V 0 , so that the current flowing through the widths W 1 and W 2 is obtained. The value is I 0 × ((W 1 + W 2 ) / W 0 ).

【0025】そこで、転写材7aを通したときに得られ
る電流値をIaとすれば、 Ia−I0 ×((W1 +W2) /W0 ) が転写材7aに流れる電流値であるから、この電流値が IL ×((W0 −W1 −W2) /W0 ) に比べて小さければ、電源10の電圧を上げて 〔Ia′−I0 ′×(W1 +W2) /W0 )〕 >IL ×((W0 −W1 −W2) /W0 ) つまり、 Ia′>IL ×((W0 −W1 −W2 )/W0 ) +I0 ′×((W1 +W2) /W0 ) となるようにすれば良い。ここにI0 ′は、昇圧した出
力電圧値V1 において、転写ローラ8と感光体ドラム1
が全幅で直接接したときに流れる電流値である。 〈参考例〉 図4は参考例装置の要部を示すもので、前記図1と同一
部分には同一符号を付して重複説明を省略する。15は
カセット、16は中間トレイ、17は給紙ローラ、18
は再給紙ローラ、19はレジスターローラ、20は定着
器である。
[0025] Therefore, if the current value obtained when through the transfer material 7a and Ia, since Ia-I 0 × ((W 1 + W 2) / W 0) is a current flowing through the transfer material 7a If this current value is smaller than I L × ((W 0 −W 1 −W 2 ) / W 0 ), the voltage of the power supply 10 is increased and [Ia′−I 0 ′ × (W 1 + W 2 )]. / W 0)]> I L × ((W 0 -W 1 -W 2) / W 0) that is, Ia '> I L × ( (W 0 -W 1 -W 2) / W 0) + I 0' × ((W 1 + W 2 ) / W 0 ). Here, I 0 ′ represents the transfer roller 8 and the photosensitive drum 1 at the boosted output voltage value V 1 .
Is the value of the current flowing when it is in direct contact with the entire width. <Reference Example> FIG. 4 shows a main part of a reference example apparatus. The same parts as those in FIG. 15 is a cassette, 16 is an intermediate tray, 17 is a paper feed roller, 18
Denotes a re-feed roller, 19 denotes a register roller, and 20 denotes a fixing device.

【0026】21・22・23は転写材7の3つの搬送
経路であり、転写材7は以下のように搬送される。ま
ず、転写材7の1面へのプリントを行なう時は、カセッ
ト15から給紙ローラ17により1枚ずつ取出された転
写材7は、破線で示した搬送経路21を搬送される。つ
まり、レジスタローラ19により感光ドラム1と同期さ
せられて転写ローラ8と感光ドラム1のニップに導か
れ、定着器20を経て、中間トレイ16に収容され、2
面目の画像形成に備える。1面のみのプリントしか行な
わない時は、転写材7は定着器20を通過後、搬送経路
23に排出される。
Reference numerals 21, 22, and 23 denote three transfer paths for the transfer material 7, and the transfer material 7 is transferred as follows. First, when printing is performed on one surface of the transfer material 7, the transfer materials 7 taken out one by one from the cassette 15 by the paper feed roller 17 are conveyed along a conveyance path 21 indicated by a broken line. That is, the toner is guided to the nip between the transfer roller 8 and the photosensitive drum 1 in synchronization with the photosensitive drum 1 by the register roller 19, and is stored in the intermediate tray 16 via the fixing device 20.
Prepare for the image formation of the surface. When printing on only one side is performed, the transfer material 7 is discharged to the transport path 23 after passing through the fixing device 20.

【0027】2面目に対する画像形成時、再給紙ローラ
18により中間トレイ16から取出された転写材7は、
搬送経路22を通ってレジスタローラ19に至り、以後
定着器20までは搬送経路21を通り、定着器20を出
た後は搬送経路23を通り外部に排出される。
During image formation on the second side, the transfer material 7 taken out of the intermediate tray 16 by the re-feed roller 18 is
After reaching the register roller 19 through the transport path 22, the sheet is discharged to the outside through the transport path 21 after passing through the transport path 21 to the fixing device 20 and out of the fixing device 20.

【0028】本参考例においては、画像形成工程以前の
前回転工程において、転写材7を搬送経路21により一
旦カセット15より取出し、転写ローラ8と感光ドラム
1のニップに導く。そして、この時、電流計11で得た
測定値により、コントローラ12で適正転写バイアスを
決定する。この際、感光ドラム1上には顕像6は存在し
ないので、転写材7は白紙のまま、定着器20を経て、
中間トレイに収容される。
In the present embodiment, in the pre-rotation step before the image forming step, the transfer material 7 is once taken out of the cassette 15 by the transport path 21 and guided to the nip between the transfer roller 8 and the photosensitive drum 1. At this time, an appropriate transfer bias is determined by the controller 12 based on the measured value obtained by the ammeter 11. At this time, since the visible image 6 does not exist on the photosensitive drum 1, the transfer material 7 remains blank and passes through the fixing device 20.
It is stored in the intermediate tray.

【0029】以上が、前回転工程であり、1面目の画像
形成工程においては、転写材7は中間トレイ16から再
給紙ローラ18によって取り出され、搬送経路22、レ
ジスタローラ19を経て転写ローラ8と感光ドラム1の
ニップに導かれる。このとき、電源10のバイアス値は
上述の前回転中に決められた値に維持され、顕像6は転
写材7の1面目に転写される。定着器20を経た後、片
面プリントの場合には搬送経路23により外部に搬出さ
れ、両面プリントの場合には搬送経路21を経て再び中
間トレイ16に収容され、2面目の画像形成に備える。
2面目の画像形成時の転写バイアス値は、1面目と同じ
値に維持される。
The above is the pre-rotation step. In the image forming step for the first side, the transfer material 7 is taken out of the intermediate tray 16 by the re-feed roller 18, passed through the transport path 22 and the register roller 19, and transferred to the transfer roller 8. And the nip of the photosensitive drum 1. At this time, the bias value of the power supply 10 is maintained at the value determined during the above-described pre-rotation, and the visible image 6 is transferred to the first surface of the transfer material 7. After passing through the fixing device 20, in the case of single-sided printing, the sheet is carried out to the outside via the transport path 23, and in the case of double-sided printing, the sheet is again stored in the intermediate tray 16 via the transport path 21 and prepared for image formation on the second side.
The transfer bias value during image formation on the second side is maintained at the same value as the first side.

【0030】本参考例の場合は、画像形成工程の転写時
点では、電源10の出力電圧は常に一定の値に維持され
るので、安定した転写性能が得られる。
In the case of the present embodiment, the output voltage of the power supply 10 is always maintained at a constant value at the time of transfer in the image forming process, so that stable transfer performance can be obtained.

【0031】なお、実施例では、転写手段として転写ロ
ーラを用いて説明したが、本発明の主旨は転写ローラに
限定されるものではなく、コロナ転写方式、ベルト転写
方式、転写ドラム方式等のいずれにも適用できることは
言うまでもない。
In the embodiments, the transfer roller has been described as the transfer means. However, the gist of the present invention is not limited to the transfer roller, but may be any of a corona transfer method, a belt transfer method, a transfer drum method, and the like. Needless to say, it can also be applied to.

【0032】[0032]

【発明の効果】以上のように、本発明は、画像担持体上
の顕像を転写手段により転写材に静電的に転写する転写
装置において、転写材の先端部で電源により転写手段に
定電圧を印加し、この時の電源の出力電流を検知し、こ
の検知電流を用いて決められた転写電圧で先端部以降の
転写動作を行なうようにしたことにより、転写手段や転
写材の抵抗値が変化しても適正な転写動作を行なえる。
As described above, according to the present invention, in a transfer apparatus for electrostatically transferring a visual image on an image carrier to a transfer material by a transfer means, a power supply is applied to the transfer means at the leading end of the transfer material. A voltage is applied, the output current of the power supply at this time is detected, and the transfer operation after the leading end is performed at a transfer voltage determined by using the detected current. , The proper transfer operation can be performed.

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

【図1】第1実施例装置の要部の概略図。FIG. 1 is a schematic view of a main part of an apparatus according to a first embodiment.

【図2】転写材先端から後端にかけての転写バイアス電
圧と電流値の推移の様子を示す図。
FIG. 2 is a diagram showing a transition of a transfer bias voltage and a current value from a leading end to a trailing end of a transfer material.

【図3】第2の実施例装置の要部の平面図。FIG. 3 is a plan view of a main part of the device according to the second embodiment.

【図4】参考例の装置の要部の概略図FIG. 4 is a schematic view of a main part of the device of the reference example.

【図5】従来の画像形成装置の一例の概略図。FIG. 5 is a schematic diagram illustrating an example of a conventional image forming apparatus.

【図6】転写ローラに対するバイアス電源の電圧−電流
特性曲線図。
FIG. 6 is a voltage-current characteristic curve diagram of a bias power supply for a transfer roller.

【符号の説明】[Explanation of symbols]

1 感光ドラム(第1の画像担持体) 5 トナー(荷電粒子) 6 顕像 7 転写材(第2の画像担持体) 8 転写ローラ(転写手段) 10 電源 11 電流検知器 12 コントローラ DESCRIPTION OF SYMBOLS 1 Photosensitive drum (1st image carrier) 5 Toner (charged particle) 6 Visible image 7 Transfer material (2nd image carrier) 8 Transfer roller (transfer means) 10 Power supply 11 Current detector 12 Controller

───────────────────────────────────────────────────── フロントページの続き (72)発明者 笹目 裕志 東京都大田区下丸子3丁目30番2号 キ ヤノン株式会社内 (72)発明者 長谷川 浩人 東京都大田区下丸子3丁目30番2号 キ ヤノン株式会社内 (72)発明者 竹内 昭彦 東京都大田区下丸子3丁目30番2号 キ ヤノン株式会社内 (72)発明者 矢野 秀幸 東京都大田区下丸子3丁目30番2号 キ ヤノン株式会社内 (72)発明者 七瀧 秀夫 東京都大田区下丸子3丁目30番2号 キ ヤノン株式会社内 (56)参考文献 特開 昭63−228179(JP,A) 特開 平3−223779(JP,A) (58)調査した分野(Int.Cl.7,DB名) G03G 15/16 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Sasame 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hiroto Hasegawa 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Akihiko Takeuchi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hideyuki Yano 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hideo Nanataki 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (56) References JP-A-63-228179 (JP, A) JP-A-3-223779 (JP, A) (58) Fields surveyed (Int.Cl. 7 , DB name) G03G 15/16

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 画像担持体上の顕像を転写手段により転
写材に静電的に転写する転写装置において、 転写材の先端部で電源により転写手段に定電圧を印加
し、この時の電源の出力電流を検知し、この検知電流を
用いて決められた転写電圧で先端部以降の転写動作を行
なう ことを特徴とする画像形成装置の転写装置。
And a transfer means for transferring a visible image on the image carrier by a transfer means.
In a transfer device that electrostatically transfers to a transfer material, a constant voltage is applied to the transfer means by a power supply at the leading end of the transfer material
The output current of the power supply at this time is detected, and this detected current is
The transfer operation after the leading end is performed with the transfer voltage determined using
A transfer device of an image forming apparatus characterized by Nau.
JP3011496A 1991-01-08 1991-01-08 Transfer device for image forming device Expired - Lifetime JP3006101B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3011496A JP3006101B2 (en) 1991-01-08 1991-01-08 Transfer device for image forming device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3011496A JP3006101B2 (en) 1991-01-08 1991-01-08 Transfer device for image forming device

Publications (2)

Publication Number Publication Date
JPH04251276A JPH04251276A (en) 1992-09-07
JP3006101B2 true JP3006101B2 (en) 2000-02-07

Family

ID=11779641

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3011496A Expired - Lifetime JP3006101B2 (en) 1991-01-08 1991-01-08 Transfer device for image forming device

Country Status (1)

Country Link
JP (1) JP3006101B2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4532629B2 (en) * 1999-10-06 2010-08-25 キヤノン株式会社 Image forming apparatus
JP4963347B2 (en) 2004-10-19 2012-06-27 キヤノン株式会社 Image forming apparatus
JP4857913B2 (en) * 2006-05-29 2012-01-18 村田機械株式会社 Image forming apparatus
KR20110039117A (en) * 2009-10-09 2011-04-15 삼성전자주식회사 Controlling method of supplying voltage in image forming apparatus and appratus for performing thereof
JP2013235058A (en) 2012-05-07 2013-11-21 Konica Minolta Inc Image forming apparatus
JP7289674B2 (en) * 2019-03-07 2023-06-12 キヤノン株式会社 image forming device

Also Published As

Publication number Publication date
JPH04251276A (en) 1992-09-07

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