JPH0244384A - Transfer material separator for image forming device - Google Patents

Transfer material separator for image forming device

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Publication number
JPH0244384A
JPH0244384A JP19433088A JP19433088A JPH0244384A JP H0244384 A JPH0244384 A JP H0244384A JP 19433088 A JP19433088 A JP 19433088A JP 19433088 A JP19433088 A JP 19433088A JP H0244384 A JPH0244384 A JP H0244384A
Authority
JP
Japan
Prior art keywords
transfer material
transfer
image
fan
separation
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
JP19433088A
Other languages
Japanese (ja)
Inventor
Yoshio Uchikawa
内川 芳男
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 JP19433088A priority Critical patent/JPH0244384A/en
Publication of JPH0244384A publication Critical patent/JPH0244384A/en
Pending legal-status Critical Current

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  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Abstract

PURPOSE:To apply sucking action to a transfer material according to the characteristic of the transfer material and to stably separate the transfer material without generating the disturbance of an image and a jamming by providing a means which varies generating air flow, and applying sucking action to a transfer material according to the transfer material. CONSTITUTION:A suction fan 5 is connected to a controller 7 which controls the rotational speed of the fan and the controller 7 is connected to a transfer material selecting switch 8 disposed on an appropriate place outside a device. The transfer material selecting switch 8 is changed over in advance by the operator of the image forming device so that the switch 8 corresponds with a transfer material; through the use of the controller 7, the rotational speed of the fan 5 is set at the value at which the speed meets the transfer material. Since sucking action meeting the condition of the transfer material is applied, stable separation is performed without having such trouble as defective separation resulting from deficient separating function, the occurrence of the jamming, and the disturbance of the image quality caused by excessive suction.

Description

【発明の詳細な説明】 (1)発明の目的 (産業上の利用分野) この発明は静電複写機、同プリンタなど静電転写プロセ
スを利用する画像形成装置、とくにその転写材分離装置
に関するものである。
Detailed Description of the Invention (1) Purpose of the Invention (Field of Industrial Application) The present invention relates to an image forming apparatus that utilizes an electrostatic transfer process, such as an electrostatic copying machine or a printer, and particularly to a transfer material separation device thereof. It is.

(従来技術と解決すべき課題) 像担持体表面に静電的に形成したトナー像を紙などシー
ト状の転写材に静電的に転写する画像形成装置において
は、転写時に転写材に付与される電荷のために、転写材
が像担持体に吸着傾向となるので、転写後、何らかの手
段によって転写材を像担持体から積極的に分離する必要
がある。
(Prior art and issues to be solved) In an image forming apparatus that electrostatically transfers a toner image formed on the surface of an image carrier onto a sheet-like transfer material such as paper, the toner image is applied to the transfer material during transfer. Since the transfer material tends to be attracted to the image carrier due to the electric charge, it is necessary to actively separate the transfer material from the image carrier by some means after the transfer.

このための分離手段として、転写後の位置で、転写時と
は逆極性の電荷を、除電用コロナ放電器によって、転写
材が転写時に獲得した電荷を中和除電するとともに、該
放電器に吸引ファンを配設して、転写材が像担持体から
分離する方向にエアを吸引して分離機能を向上させるよ
うに構成したものが提案されている。
As a separation means for this purpose, at the post-transfer position, a corona discharger is used to neutralize and eliminate the charge that the transfer material acquired during transfer, and the charge with the opposite polarity to that at the time of transfer is absorbed into the discharger. A configuration has been proposed in which a fan is provided to suck air in a direction in which the transfer material is separated from the image carrier to improve the separation function.

第4図はこのような装置の典型的な一例を略示するもの
で、紙面に垂直方向にのびていて、矢印へ方向に回転す
る円筒状の感光体10に近接して転写帯電器12、分離
帯電器13が配設してあり、像担持体10表面に形成さ
れたトナー像が感光体の回転にともなって転写帯電器1
2に対向する転写位置に到来すると、これにタイミング
を合せて搬送路11から供給される転写材Pが前記転写
位置に達し、この位置で転写帯電器12に印加される転
写バイアスによって感光体側のトナー像は転写材に転移
する。
FIG. 4 schematically shows a typical example of such an apparatus, in which a transfer charger 12, A separation charger 13 is provided, and the toner image formed on the surface of the image carrier 10 is transferred to the transfer charger 1 as the photoreceptor rotates.
2, the transfer material P supplied from the conveyance path 11 reaches the transfer position at the same timing, and at this position, the transfer bias applied to the transfer charger 12 causes the transfer material P to be applied to the photoreceptor side. The toner image is transferred to the transfer material.

転写後、転写材が分離帯電器13の位置に達すると、こ
れによって、転写材には転写時とは反対極性のバイアス
が印加され、転写材が転写時に得た電荷は中和除電され
、感光体への吸M傾向が減少して、転写材自体の有する
弾性、自重によって感光体から分離する。
After the transfer, when the transfer material reaches the position of the separation charger 13, a bias with a polarity opposite to that during transfer is applied to the transfer material, and the charge that the transfer material has acquired during transfer is neutralized and removed, and the transfer material is exposed to light. The tendency of M to be absorbed by the transfer material decreases, and the transfer material separates from the photoreceptor due to its own elasticity and weight.

分離帯電器13には吸引ファン14が接続してあって、
図示白抜き矢印の方向にエアを吸引しているので、感光
体から分離しやすくなった転写材は確実に感光体から分
離し、搬送路15を経て不図示の定着部位に搬送される
A suction fan 14 is connected to the separation charger 13,
Since air is sucked in the direction of the illustrated white arrow, the transfer material that is easily separated from the photoconductor is reliably separated from the photoconductor and is conveyed via the conveyance path 15 to a fixing site (not shown).

なお、感光体10の周辺には、クリーニング装置のみが
符号16として示しであるが、その他−次帯電器、現像
器等画像形成に必要な部材が配設しであることは云うま
でもない。
Although only a cleaning device is shown as 16 around the photoreceptor 10, it goes without saying that other members necessary for image formation, such as a secondary charger and a developing device, are also provided.

上記のような構成によって、転写後における転写材の分
離に、転写材の特性にあまり変化がない場合には5それ
なりの効果をあげているが、近来この種の画像形成装置
においては1種々な特性の転写材を使用し得ることが要
求されるようになってきており、前述のような、分離y
k電による転写材自身の分離能にも、転写材によって著
しい相違があるため、前記のような−様な分離手段では
個々の転写材に適合できず、分離不良による画質の劣化
、ジャムの発生などの不都合を生ずることを免かれない
The above-mentioned configuration has been effective in separating the transfer material after transfer when there is not much change in the characteristics of the transfer material. It has become necessary to be able to use transfer materials with specific characteristics, and as mentioned above, separation y
The separation ability of the transfer material itself by k-electricity also varies significantly depending on the transfer material, so the above-mentioned separation means cannot be adapted to each individual transfer material, resulting in deterioration of image quality and occurrence of jams due to poor separation. Such inconveniences cannot be avoided.

これについて説明すると、下記第1表に示すような、特
性を異にする2種類の紙A、Bを転写材として使用する
と、これらが感光体から分離する位置が第4図に示すよ
うに異なってくる。
To explain this, when two types of paper A and B, which have different characteristics as shown in Table 1 below, are used as transfer materials, the positions at which they separate from the photoreceptor will differ as shown in Figure 4. It's coming.

第1表 即ち、厚手で剛性の大きい紙Aは分離しやすいので、同
図に符号Aで示すように、転写後速やかに感光体から分
離して搬送路15に乗って定着位置に搬送されるが、薄
手で剛性の小さい紙Bは、感光体から充分に分離せずこ
れに追随し、ある程度進行してから分離する。
Table 1: Paper A, which is thick and rigid, is easy to separate, so it is quickly separated from the photoreceptor after transfer and transported to the fixing position on the transport path 15, as shown by the symbol A in the figure. However, paper B, which is thin and has low rigidity, does not separate sufficiently from the photoreceptor and follows this, and separates after progressing to a certain extent.

このために1通常転写、分離用帯電器の下流側に配置さ
れているクリーニング装置16に接触して、未定着のト
ナー像を乱したり、さらに、クリーニング装置の位置に
まで至ってジャムを発生したりすることがある。
For this reason, the toner may come into contact with the cleaning device 16 located downstream of the normal transfer/separation charger and disturb the unfixed toner image, or even reach the cleaning device and cause a jam. Sometimes.

このような事態を回避するために吸引ファン14の作用
を強めると、転写材が分離したときに振動して画像の乱
れを生ずる。
If the action of the suction fan 14 is strengthened to avoid such a situation, when the transfer material is separated, it will vibrate and cause image disturbance.

さらにまた、いったん−面に画像形成を行なったのち、
核部または裏面に画像形成操作を行なう、多重ないしは
両面複写の場合には、当初の操作で生じた転写材の変形
のために、該転写材が本来有していた分離能が失われて
、これによる分離不良が発生する。とくに、加熱ローラ
を使用する定着装置を利用する場合には、第1面複写時
に発生したカールの影響で前述のような不都合が頻繁に
発生する。
Furthermore, once an image is formed on the - side,
In the case of multiple or double-sided copying in which an image formation operation is performed on the core or back side, the original separation ability of the transfer material is lost due to the deformation of the transfer material caused by the initial operation. This causes separation failure. In particular, when using a fixing device that uses a heating roller, the above-mentioned inconvenience frequently occurs due to curling that occurs during copying of the first side.

本発明はこのような奏態に対処すべくなされたものであ
って、転写材分離位置において、吸引ファンによって転
写材を吸引分離させるように構成した画像形成装置にお
いて、転写材の特性に応じた吸引作用を転写材に付与し
て、常時最適の吸引作用を付与して1画像の乱れやジャ
ムの発生がなく安定した転写材分離作用を奏するような
分離装置を提供することを目的とするものである。
The present invention has been made to deal with such a situation, and is an image forming apparatus configured to suck and separate the transfer material using a suction fan at the transfer material separation position. It is an object of the present invention to provide a separating device that provides a suction action to a transfer material and constantly provides an optimal suction action to perform a stable transfer material separation action without causing disturbance of one image or occurrence of jams. It is.

(2)発明の構成 (課題を解決する技術手段、その作用〕上記の目的を達
成するため1本発明は、像担持体表面に形成した可転写
トナー像に転写材を当接し、この位置で転写帯電器によ
って転写バイアスを印加して前記トナー像を転写材に転
移させ、ついで転写後の位置で、この転写材を像担持体
から分離させる方向に気流を発生する手段をそなえた画
像形成装置において1発生する気流を、転写材によって
変化させる手段を設けたことを特徴とするものである。
(2) Structure of the invention (technical means for solving the problem and its operation) In order to achieve the above objects, the present invention provides a method in which a transfer material is brought into contact with a transferable toner image formed on the surface of an image carrier, and at this position. An image forming apparatus comprising means for transferring the toner image onto a transfer material by applying a transfer bias using a transfer charger, and then generating an air current in a direction to separate the transfer material from the image carrier at a post-transfer position. The present invention is characterized in that a means is provided for changing the airflow generated in the transfer material according to the transfer material.

このように構成することによって、各種の転写材に対し
て常時安定的に良好な分離を実行することができる。
With this configuration, it is possible to perform stable and good separation of various transfer materials at all times.

(実施例の説明) 第1図は、#記公知の装置と同様の6回転円筒状の感光
体をそなえた画像形成装置に本発明を適用した実施例を
示す要部の側面図であって、矢印A方向に回転する感光
体lに近接して転写帯電器3、分離帯電器4が配設して
あり、感光体1の表面に形成された可転写トナー像が、
該感光体の回転にともなって転写帯電器3のある転写部
位に到来すると、これとタイミングを合せて、WI送路
2から転写材(不図示)が前記転写部位に持ち来たされ
、これとともに転写帯電器によって転写バイアスが印加
され、感光体表面のトナー像は、静電的に転写材に転移
する。
(Description of Embodiments) FIG. 1 is a side view of essential parts showing an embodiment in which the present invention is applied to an image forming apparatus equipped with a 6-turn cylindrical photoreceptor similar to the known apparatus marked #. , a transfer charger 3 and a separation charger 4 are disposed close to the photoreceptor l rotating in the direction of arrow A, and the transferable toner image formed on the surface of the photoreceptor 1 is
As the photoreceptor rotates, the transfer material (not shown) is brought to the transfer site from the WI feeding path 2 in synchronization with the transfer charger 3, and along with this, a transfer material (not shown) is brought to the transfer site from the WI feeding path 2. A transfer bias is applied by a transfer charger, and the toner image on the surface of the photoreceptor is electrostatically transferred to the transfer material.

ついで、このトナー像を担持する転写材が分離帯電器4
に位置に到来すると、転写時とは逆極性のバイアスが該
帯電器によって印加され、転写時に転写材が獲得した電
荷は中和除電されるとともに、吸引ファン5によって、
転写材が感光体lから分離されるような方向に気流が形
成されているので、これの作用にもよって転写材は感光
体から分離し、搬送路6を経て不図示の定着部位に送給
されるものとする。
Then, the transfer material carrying this toner image is transferred to a separation charger 4.
When the transfer material reaches the position, a bias with a polarity opposite to that during transfer is applied by the charger, and the charge acquired by the transfer material during transfer is neutralized and eliminated, and the suction fan 5
Since an air current is formed in a direction that separates the transfer material from the photoreceptor l, the transfer material is separated from the photoreceptor due to the action of this airflow, and is sent to a fixing site (not shown) via the conveyance path 6. shall be carried out.

以上の作用ならびに感光体lの周辺に画像形成に要する
部材が配設しであることは、前記公知の画像形成装置の
場合ととくに変りはない。
The above-mentioned operation and the fact that the members necessary for image formation are arranged around the photoreceptor 1 are not particularly different from those of the known image forming apparatus.

このような装置において本発明においては、前記吸引フ
ァン5をファン回転速度コントローラ7にta統すると
ともに、これを装置外部適所に配設した転写材選択スイ
ッチ8に接続しである。
In the present invention, in such an apparatus, the suction fan 5 is connected to a fan rotation speed controller 7, and this is connected to a transfer material selection switch 8 disposed at a suitable location outside the apparatus.

転写材選択スイッチ8は、画像形成装置の操作者が予め
転写材に対応するように切替えておくものとし、これに
よって前記コントローラ7を制御してファン5の回転数
を転写材に適合する値に設定するものとする。下記の表
は、前記転写材A、Bに対する、1面目コピー時、2面
目コピー時におけるファンの設定回転数を示すものであ
る。
The transfer material selection switch 8 is switched in advance by the operator of the image forming apparatus to correspond to the transfer material, and thereby controls the controller 7 to set the rotation speed of the fan 5 to a value suitable for the transfer material. shall be set. The table below shows the set rotational speed of the fan for the transfer materials A and B when copying the first side and when copying the second side.

第2表 単位: CPM (cycle per 5inite
s)以上のようにファンの回転数を、転写材に応じてつ
設定することによって、転写材の状jEに適合した吸引
作用をこれに与えて1分gI機能不足による分離不良、
ジャムの発生あるいは吸引過多による画質の乱れなどの
不都合を生ずることなく、安定した分離作用を奏するこ
とができる。
Table 2 Unit: CPM (cycle per 5inite)
s) By setting the rotation speed of the fan according to the transfer material as described above, a suction action suitable for the condition of the transfer material is given to it, and separation failure due to insufficient gI function can be avoided.
A stable separation effect can be achieved without causing problems such as occurrence of jam or disturbance of image quality due to excessive suction.

第2図は転写材選択スイッチの他の構成を示すものであ
って、同図は前記実施例装置における、ファンの制御部
に相当する部分のみを示すものである。
FIG. 2 shows another configuration of the transfer material selection switch, and this figure shows only the portion corresponding to the fan control section in the apparatus of the embodiment.

ファン速度コントローラ7は転写材識別処理回路80に
接続してあり、これに1図示の場合、4個の接点81.
82.83および84が取着しである。
The fan speed controller 7 is connected to a transfer material identification processing circuit 80, which has four contacts 81.
82, 83 and 84 are attachments.

図示符号Cは転写材を収納するカセットであって、それ
ぞれ異なる転写材を収納する複数個のカセットを使い分
けるものとし、図示の場合、接点81に対応する位置に
、これを作動させる接点C工をそなえたカセットが画像
形成装置に装着されている。
Reference symbol C in the figure is a cassette for storing transfer materials, and a plurality of cassettes each storing different transfer materials are used. The provided cassette is installed in the image forming apparatus.

したがって、転写材識別処理回路80、コントa−ラフ
を介して吸引ファン5は、このときカセ−/ トCに収
納されている転写材に適した吸引作用をこれに及ぼすこ
とができる。
Therefore, the suction fan 5 can apply a suction action suitable for the transfer material stored in the cassette/container C at this time via the transfer material identification processing circuit 80 and the controller A-Rough.

なお、複数個のカセットを用意する代りに、接点C1を
可動とし、収納した転写材に応じて七の位置を、前記接
点81ないし84のいずれかに当接するようにしても同
様の作用を奏し得るものであることは容易に理解できる
ところであろう。
Incidentally, instead of preparing a plurality of cassettes, the same effect can be obtained by making the contact C1 movable so that it contacts any of the contacts 81 to 84 at the seventh position depending on the stored transfer material. It is easy to understand that this is something that can be achieved.

第3図は本発明のさらに他の実施例を示すものであって
、前記第1図に示す装置と対応する部分には同一の符号
を付して示してあり、とくに必要のない限り、それらに
ついての説明は省略する。
FIG. 3 shows still another embodiment of the present invention, in which parts corresponding to those shown in FIG. The explanation for this will be omitted.

この装置においては、分離WF電器4と吸引ファン5と
を連結するダクト適所にシャッタ9が配設しである。
In this device, a shutter 9 is disposed at an appropriate position in a duct connecting the separated WF electric appliance 4 and the suction fan 5.

該シャッタ9は、シャッタ部材9aと、これを変位させ
てダクトを閉塞する位置から開放する位置までをとらせ
るためのビニオン9bとをそなえており、このビニオン
9bが、転写材識別スイッチ8.これによって作動する
ビニオン回転量コントローラ70によってダクトの開口
部の大いさを通出に設定して吸引風量を、使用される転
写材の特性に適合させるものとする、 下記の表は、前述の転写材A、Hに対応する1面目コピ
ー時、2面目コピー時におけるシャッタの開口巾を示す
一例である。
The shutter 9 includes a shutter member 9a and a pinion 9b for displacing the shutter member from a position where the duct is closed to a position where the duct is opened. The size of the opening of the duct is set to the output by the pinion rotation amount controller 70 activated by this, and the suction air volume is adapted to the characteristics of the transfer material to be used. This is an example showing the opening width of the shutter when copying the first side and copying the second side corresponding to A and H.

第3表 単位;1111 このような構成によっても前述の実施例の装置と同様に
、転写材の特性に適した分離作用をこれに付与すること
が可能である。
Table 3 Unit: 1111 With such a configuration as well, it is possible to impart a separating effect suitable to the characteristics of the transfer material, similarly to the apparatus of the above-described embodiment.

(3)発明の詳細 な説明したように、本発明によるときは、像担持体表面
のトナー像を、これに密接した転写材に静電的に転写す
るように構成し、転写後の位置で、該転写材を像担持体
から分離する方向に気流を発生する手段をそなえた画像
形成装置において、該気流を、転写材の特性に応じて変
化させるようにしたから、この気温不足による分離不良
、ジャムの発生、また気流過多による画像の乱れなどを
確実に阻止し、常時安定した分離が可能であり、良質の
画像を得るに資するところが大である。
(3) As described in detail, according to the present invention, the toner image on the surface of the image carrier is electrostatically transferred to a transfer material in close contact with the toner image, and the toner image is electrostatically transferred at a position after transfer. In an image forming apparatus equipped with a means for generating airflow in the direction of separating the transfer material from the image carrier, the airflow is changed according to the characteristics of the transfer material, so that separation failure due to insufficient temperature can be avoided. It reliably prevents the occurrence of jams and image disturbances due to excessive air flow, and enables stable separation at all times, which greatly contributes to obtaining high-quality images.

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

第1図は本発明の実施例を示す画像形成装置の要部側面
図、 第2図、@3図はそれぞれ本発明の他の実施例を示す説
明図、 第4図は公知の画像形成装置の構成1作用を示す説明図
である。 1・ゆ・感光体、2・・書搬送路、3・・・転写帯電器
、4・・・分離帯電器、5・・會吸引ファン、7・・・
吸引ファン回転速度コントローラ、8・・・転写材識別
スイッチ、9・・・シャッタ・ 第 図 第 図 第 図
FIG. 1 is a side view of essential parts of an image forming apparatus showing an embodiment of the present invention, FIGS. 2 and 3 are explanatory diagrams showing other embodiments of the present invention, and FIG. 4 is a known image forming apparatus. FIG. 1. Photoconductor, 2. Document transport path, 3. Transfer charger, 4. Separation charger, 5. Suction fan, 7.
Suction fan rotation speed controller, 8... Transfer material identification switch, 9... Shutter.

Claims (4)

【特許請求の範囲】[Claims] (1)像担持体表面に形成した可転写トナー像に転写材
を当接し、この位置で転写帯電器によって転写バイアス
を印加して前記トナー像を転写材に転移させ、ついで転
写後の位置で、この転写材を像担持体から分離させる方
向に気流を発生する手段をそなえた画像形成装置におい
て、 発生する気流を、転写材によって変化させる手段を設け
たことを特徴とする転写材分離装置。
(1) A transfer material is brought into contact with the transferable toner image formed on the surface of the image carrier, a transfer bias is applied by a transfer charger at this position to transfer the toner image to the transfer material, and then the toner image is transferred to the transfer material at the position after transfer. , a transfer material separation device comprising a means for generating an airflow in a direction to separate the transfer material from an image carrier, the transfer material separation device comprising a means for changing the generated airflow depending on the transfer material.
(2)気流を転写材の特性によって変化させる特許請求
の範囲第1項記載の転写材分離装置。
(2) The transfer material separation device according to claim 1, wherein the airflow is changed depending on the characteristics of the transfer material.
(3)気流を画像形成操作の順序によって変化させる特
許請求の範囲第1項記載の転写材分離装置。
(3) The transfer material separation device according to claim 1, wherein the airflow is changed depending on the order of image forming operations.
(4)気流を変化させる手段が吸引ダクトを開閉するシ
ャッタをそなえてなる特許請求の範囲第1項ないし第3
項のいずれか記載の転写材分離装置。
(4) Claims 1 to 3, wherein the means for changing the airflow includes a shutter for opening and closing the suction duct.
The transfer material separation device according to any one of paragraphs.
JP19433088A 1988-08-05 1988-08-05 Transfer material separator for image forming device Pending JPH0244384A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19433088A JPH0244384A (en) 1988-08-05 1988-08-05 Transfer material separator for image forming device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19433088A JPH0244384A (en) 1988-08-05 1988-08-05 Transfer material separator for image forming device

Publications (1)

Publication Number Publication Date
JPH0244384A true JPH0244384A (en) 1990-02-14

Family

ID=16322797

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19433088A Pending JPH0244384A (en) 1988-08-05 1988-08-05 Transfer material separator for image forming device

Country Status (1)

Country Link
JP (1) JPH0244384A (en)

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