JPH02148074A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH02148074A JPH02148074A JP30070588A JP30070588A JPH02148074A JP H02148074 A JPH02148074 A JP H02148074A JP 30070588 A JP30070588 A JP 30070588A JP 30070588 A JP30070588 A JP 30070588A JP H02148074 A JPH02148074 A JP H02148074A
- Authority
- JP
- Japan
- Prior art keywords
- transfer
- thermoplastic elastomer
- transfer material
- image forming
- belt
- 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
Links
- 239000000463 material Substances 0.000 claims abstract description 46
- -1 polyethylene terephthalate Polymers 0.000 claims abstract description 10
- 229920005989 resin Polymers 0.000 claims abstract description 9
- 239000011347 resin Substances 0.000 claims abstract description 9
- 239000002033 PVDF binder Substances 0.000 claims abstract description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 claims abstract description 4
- 239000005020 polyethylene terephthalate Substances 0.000 claims abstract description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 25
- 229920002725 thermoplastic elastomer Polymers 0.000 claims description 17
- 229920001971 elastomer Polymers 0.000 claims description 6
- 239000000806 elastomer Substances 0.000 claims description 6
- 239000002344 surface layer Substances 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 2
- 239000004642 Polyimide Substances 0.000 claims description 2
- 239000004793 Polystyrene Substances 0.000 claims description 2
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 claims description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 2
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 239000011737 fluorine Substances 0.000 claims description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- 229920001721 polyimide Polymers 0.000 claims description 2
- 229920000098 polyolefin Polymers 0.000 claims description 2
- 229920002223 polystyrene Polymers 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 2
- 239000004952 Polyamide Substances 0.000 claims 1
- 239000005062 Polybutadiene Substances 0.000 claims 1
- 229920002492 poly(sulfone) Polymers 0.000 claims 1
- 229920002857 polybutadiene Polymers 0.000 claims 1
- 229920006345 thermoplastic polyamide Polymers 0.000 claims 1
- 230000007774 longterm Effects 0.000 abstract description 5
- 239000004065 semiconductor Substances 0.000 abstract 1
- 230000003068 static effect Effects 0.000 description 19
- 108091008695 photoreceptors Proteins 0.000 description 16
- 238000004140 cleaning Methods 0.000 description 8
- 230000008030 elimination Effects 0.000 description 8
- 238000003379 elimination reaction Methods 0.000 description 8
- 239000012790 adhesive layer Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000005611 electricity Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 201000004384 Alopecia Diseases 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- YACLQRRMGMJLJV-UHFFFAOYSA-N chloroprene Chemical compound ClC(=C)C=C YACLQRRMGMJLJV-UHFFFAOYSA-N 0.000 description 2
- 208000024963 hair loss Diseases 0.000 description 2
- 230000003676 hair loss Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 239000011231 conductive filler Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 150000002816 nickel compounds Chemical class 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 150000003377 silicon compounds Chemical class 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 150000003609 titanium compounds Chemical class 0.000 description 1
- 230000002103 transcriptional effect Effects 0.000 description 1
- 208000002271 trichotillomania Diseases 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【発明の詳細な説明】
(1、発明の名称
(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′取転写
プロセスを利用する画像形成袋δに関するものである。DETAILED DESCRIPTION OF THE INVENTION (1. Title of the Invention (Field of Industrial Application) This invention relates to an image forming bag δ that uses an electrostatic transfer process, such as an electrostatic copying machine or a printer.
(従来技術と解決すべき課題)
誘電体からなる転写ベルトまたは円筒状の基体表面に誘
電体フィルムを貼着してなる転写ドラトのような転写材
保持部材によって転写材を吸着搬送し、該保持部材とこ
れに対設する像担持体とで形成する転写部位を前記転写
材を通過させて、像1(1持体側のトナー像を転写材に
転移させるような画像形成装置がすでに提案されている
。(Prior Art and Issues to be Solved) The transfer material is attracted and conveyed by a transfer material holding member such as a transfer belt made of a dielectric material or a transfer drum made of a dielectric film pasted on the surface of a cylindrical substrate, and the transfer material is held. An image forming apparatus has already been proposed in which the transfer material is passed through a transfer site formed by a member and an image carrier disposed opposite thereto, and the toner image on the image 1 (1 carrier side) is transferred to the transfer material. There is.
このような画像形成装置においては、転写材保持部材は
、これに転写材を確実に保持搬送させるためには、その
抵抗値を充分に高く維持する必要があるが、反面、あま
り高すぎると、くり返し作業の場合、該保持部材が除電
しきれずに電荷が蓄積されて所謂チャージアップ現象が
生じ、転写材の保持部材への吸着不良、転写不良などを
発生するおそれがある。In such an image forming apparatus, the transfer material holding member needs to maintain a sufficiently high resistance value in order to reliably hold and transport the transfer material, but on the other hand, if the resistance value is too high, In the case of repeated operations, the holding member may not be able to completely eliminate the charge and the charge may accumulate, resulting in a so-called charge-up phenomenon, which may result in poor adsorption of the transfer material to the holding member, poor transfer, and the like.
このような欠点を回避するために、転写材保持部材を接
地したブラシで摺擦したり、これに交流コロナ放電を印
加して除電するような提案がなされている。即ち、接地
したブラシを、転写材保持部材を介して接地した導電性
ローラなどに対向して配設し、該ブラシで転写材保持部
材表面を摺擦させることによって、表面電荷をブラシで
、裏面の電荷を該導電性ローラで除去するような手段が
知られている。In order to avoid such drawbacks, proposals have been made to remove static electricity by rubbing the transfer material holding member with a grounded brush or by applying alternating current corona discharge thereto. That is, a grounded brush is disposed opposite to a grounded conductive roller or the like via a transfer material holding member, and the brush is rubbed against the surface of the transfer material holding member, thereby removing the surface charge and removing the surface charge from the back surface. A method is known in which the electrical charge is removed by the conductive roller.
ところが、このような除電手段は、転写材保持部材の表
裏両面で同時に行なう必要があり、そのため、裏面除重
用の導電性ローラの配置は比較的自由であるが、表面を
除電するためのブラシは、転写材搬送路以外の部分で、
かつ転写材保持部材の全I+]をカバーするように配置
する必要があるので、これを配設することができる空間
は限定されざるを得ないうえ、ブラシ自体の劣化による
抜は毛によって除電不良や抜は毛による画像への悪影響
を生ずるおそれがある。However, such a static eliminating means must be applied to both the front and back sides of the transfer material holding member at the same time, and therefore, although the conductive roller for removing the load on the back side can be arranged relatively freely, the brush for eliminating static electricity on the front side is , in areas other than the transfer material conveyance path,
Since the transfer material holding member must be placed so as to cover all I+, the space in which it can be placed is limited, and the deterioration of the brush itself may result in poor static removal due to the bristles. Hair plucking may have a negative effect on the image due to the hair.
また、チャージアップ現象を防止するために、体積抵抗
が1011〜10”Ωcm程度の、比較的低抵抗の半導
電性ベルトを用いることが提案されており、このような
場合には、ベルトの一部を接地するだけでベルト表面の
′電荷を除去できる。In addition, in order to prevent the charge-up phenomenon, it has been proposed to use a relatively low-resistance semiconductive belt with a volume resistivity of about 1011 to 10" Ωcm. In such a case, it has been proposed to The electric charge on the belt surface can be removed by simply grounding the belt.
しかしながら、この種のものは、誘電体ベルト、とくに
樹脂で形成されたベルトに比べて機械的強度が訊く小さ
く、長期の使用に耐えないばかりでなく、ベルトの変形
による転写不良、ベル;・の断裂を発生する可能性があ
る。However, this type of belt is small in mechanical strength compared to dielectric belts, especially belts made of resin, and not only cannot withstand long-term use, but also causes transfer defects due to belt deformation. Rupture may occur.
本発明はこのような!I%−fルに対処すべくなされた
ものであって、転写ベル]・など接触タイプの転写−「
段をそなえた画像形成装置において、強度が大で長期の
使用に耐え、除電不良によるチャージアンプをよく阻[
lして、常時安定して良好な転写を遂行できるような画
像形成装置を提供することを目的とするものである。This invention is like this! It was designed to deal with the problem of contact type transfers such as transfer bells and transfer bells.
In image forming apparatuses equipped with stages, it is strong enough to withstand long-term use, and effectively prevents charge amplifiers caused by poor static elimination.
It is an object of the present invention to provide an image forming apparatus that can perform stable and good transfer at all times.
(2)発明の構成
(課題を解決する技術手段、その作用)1−記の目的を
達成するため、本発明は、像担持体と、これに当接して
転写材を吸着搬送する転写材保持搬送手段とをそなえた
画像形成装置において、前記転写材保持搬送手段が、体
積抵抗が108〜1OIIiΩcI11の範囲内にある
表層と、引張り強度が300Kg/am’以−Lの裏層
とからなる重層構成のシート状部材からなることを特徴
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 object described in 1-1, the present invention provides an image carrier and a transfer material holder that adsorbs and conveys the transfer material by contacting the image carrier. In the image forming apparatus equipped with a conveying means, the transfer material holding and conveying means is a multilayer comprising a surface layer having a volume resistivity within the range of 108 to 1OIIiΩcI11 and a back layer having a tensile strength of 300 Kg/am'-L or more. It is characterized by being made of a sheet-like member having a structure.
このように構成することによって、L記のような画像形
成装置において、転写材保持搬送手段の除電不良による
チャージアップにもとすく画質の劣化を阻止するどとも
に、該手段の大きい機械的強度によって長期の使用に耐
える画像形成装置を得ることができる。With this configuration, in an image forming apparatus such as the one described in L, image quality can be prevented from deteriorating due to charge-up due to poor static elimination in the transfer material holding and conveying means, and the high mechanical strength of the means can prevent deterioration of the image quality. An image forming apparatus that can withstand long-term use can be obtained.
(実施例の説明)
第1図は本発明の実施例を示す、転写ベルトを利用した
画像形成装置の要部の斜面図であって、矢印A方向に回
転する円筒状の感光体11と、アスされている導電性ロ
ーラ15.16間に懸架されていて、前記感光体11に
接触1.てこれと同期走行する転写ベルト12をそなえ
ている。(Description of Embodiments) FIG. 1 is a perspective view of the main parts of an image forming apparatus using a transfer belt, showing an embodiment of the present invention, in which a cylindrical photoreceptor 11 rotating in the direction of arrow A, The conductive rollers 15 and 16 are suspended between ground conductive rollers 15 and 16, and are in contact with the photoreceptor 11. A transfer belt 12 is provided which runs in synchronization with the lever.
転写ベルト12を挟んで、感光体11の反対側には、感
光体l1表面に予め形成されているトナー像のトナーと
は逆極性の電圧が電源14によって印加されて転写電界
を形成する導電性転写ローラ13が配設しである。On the opposite side of the photoreceptor 11 across the transfer belt 12, a conductive material is applied by a power source 14 with a voltage having a polarity opposite to that of the toner of the toner image previously formed on the surface of the photoreceptor l1 to form a transfer electric field. A transfer roller 13 is provided.
転写ベルト12に供給された転写材Pは、該ベルト+を
静電的に吸着されて搬送され、前記転写ローラ13の存
在する転写部位において、感光体側のトナー像は転写旧
に転写され、さらに走行して転写ベルトから分離して不
図示の定着部位に搬送されるものとする。The transfer material P supplied to the transfer belt 12 is electrostatically attracted to the belt + and conveyed, and at the transfer site where the transfer roller 13 is present, the toner image on the photoreceptor side is transferred to the transfer material, and further It is assumed that the image forming apparatus travels, is separated from the transfer belt, and is conveyed to a fixing site (not shown).
図示符号18は、転写時に転写材に転移せずに転写ベル
トに残った残留l・ナーを除去するためのクリーニング
ブレードであって、ウレタン、クロロブレン、NBRな
どのりi性材料で形成しであるものとする。Reference numeral 18 denotes a cleaning blade for removing residual lubricant and toner remaining on the transfer belt without being transferred to the transfer material during transfer, and is made of adhesive material such as urethane, chloroprene, or NBR. shall be.
このような画像形成装置において、前述の転写ベルI・
12は、第2図に示すように、甲゛導電層121、接着
層】22および絶縁層123がらなっている。In such an image forming apparatus, the above-mentioned transfer bell I.
12, as shown in FIG. 2, consists of a conductive layer 121, an adhesive layer 22, and an insulating layer 123.
絶縁層123はポリエチレンテレフタレート(PET)
、フッ素樹脂、ポリエチレン、ポリイミド、ボリサルフ
オンなどの樹脂から選択した樹脂層であることが望まし
く、厚みが50〜150゜mの範囲内にあり、引張り強
度300 kg/ cm’以上のものを用いるものとす
る。Insulating layer 123 is polyethylene terephthalate (PET)
The resin layer is preferably selected from resins such as , fluororesin, polyethylene, polyimide, borisulfon, etc., has a thickness in the range of 50 to 150 mm, and has a tensile strength of 300 kg/cm' or more. do.
引張り強度の試験方法について略述すると、試験はJI
S K7113(プラスチックの引張り試験)に則っ
て行なわれた。試験片としては、PET5X50nu+
+、厚み100 ALmのものを使用した。前記試験片
の両端を保持して投手力向に、試験速度50 mm/
minで牽引した。To briefly explain the tensile strength test method, the test is JI
It was conducted in accordance with SK7113 (Plastic tensile test). As a test piece, PET5X50nu+
+, thickness 100 ALm was used. Holding both ends of the test piece, the test piece was placed in the direction of the pitcher's force at a test speed of 50 mm/
It was towed at min.
この結果、I−記試験片の引張り強度は1000〜15
00 kg/ cm’であった。As a result, the tensile strength of the test piece I- was 1000 to 15
00 kg/cm'.
半導電層121は、ポリフッ化ビニリデン、ポリオレフ
ィン系熱可・塑性エラストマ、ポリエステル系熱IIf
塑性エラストマ、ポリウレタン系熱可塑性エラストマ、
ポリスチレン系熱可塑性エラストマ、ポリアミド系熱可
塑性エラス]・マ、フッ素系熱熱可塑性エラス)・マ、
エチレン−酢酸ビニール系熱り塑性エラストマ、ポリ塩
化ビニール系熱可塑性エラストでなどから選択されたエ
ラストマ層で、これに、カーボンブラック、金属粉など
の導電性フィーラあるいはチタン化合物、ニッケル化合
物、シリコン化合物などの半導電性フィーラをを混合し
、またはポリマの構造を変化させるなどによって、エラ
ストマ層の体積抵抗を108〜io+5Ωcmの範囲内
に調整し、厚みを10〜11001Lの範囲内に設定し
たものを使用する。The semiconductive layer 121 is made of polyvinylidene fluoride, polyolefin thermoplastic/plastic elastomer, or polyester thermoplastic IIf.
Plastic elastomer, polyurethane thermoplastic elastomer,
Polystyrene-based thermoplastic elastomer, polyamide-based thermoplastic elastomer), fluorine-based thermoplastic elastomer),
An elastomer layer selected from ethylene-vinyl acetate thermoplastic elastomer, polyvinyl chloride thermoplastic elastomer, etc. In addition, a conductive filler such as carbon black, metal powder, or a titanium compound, nickel compound, silicon compound, etc. The volume resistivity of the elastomer layer was adjusted within the range of 108 to io+5 Ωcm by mixing a semiconductive feeler or changing the structure of the polymer, and the thickness was set within the range of 10 to 11001L. do.
上記の材質のものを用いて、押し出し成型、遠心分離成
型などによって半導電層部材と絶縁層部材となるエンド
レスベルトを形成し、これらを重畳して両者を接着剤層
で貼着固定する。厚みは、絶縁層70JJ、Ill、半
導電層30用m、接着剤層を30Bmとした。接着剤層
としては絶縁層、半導電層の材質によって適宜に選択で
きる。Using the above-mentioned materials, an endless belt serving as a semiconducting layer member and an insulating layer member is formed by extrusion molding, centrifugal molding, etc., and these are overlapped and fixed by adhesion with an adhesive layer. The thickness of the insulating layer was 70JJ, Ill, the thickness of the semiconducting layer was 30m, and the thickness of the adhesive layer was 30Bm. The adhesive layer can be appropriately selected depending on the material of the insulating layer and the semiconductive layer.
このように転写ベルi・とじて表面に半導電層を、裏面
に絶縁樹脂層を形成したものを用い、転写ローラを転写
ベルi・と感光体の圧接ニップ部に当接するようにした
ので、感光体のトナー像に集中電界をかけることができ
、トナーの飛び散りゃ転写抜けがなく高効率で転写を行
なうことができる。In this way, we used a transfer belt i, which had a semiconductive layer on its surface and an insulating resin layer on its back surface, and brought the transfer roller into contact with the pressure nip between the transfer belt i and the photoreceptor. A concentrated electric field can be applied to the toner image on the photoreceptor, and transfer can be performed with high efficiency without causing any missing transfer even if the toner scatters.
また、転写材の分離時における剥離放電によるチャージ
アップを阻11ニするための、転写ベルトの除電につい
ては、転写ベルトの巾方向全長にわたって除゛市ブラシ
を配設する必要がなく、図示のように、転写ベルトの表
面の一部に接触する小型の除電ブラシ17と、該ベルト
を挟んでブラシと対向する位置にある導電性ローラ16
とによって充分な除電作用が得られる。Furthermore, in order to eliminate static electricity from the transfer belt in order to prevent charge-up due to peeling discharge when the transfer material is separated, there is no need to provide a discharge brush along the entire width of the transfer belt, as shown in the figure. A small static elimination brush 17 that contacts a part of the surface of the transfer belt, and a conductive roller 16 located opposite the brush with the belt in between.
A sufficient static elimination effect can be obtained by this.
このように除電ブラシが小型ですむので、毛抜けによる
画像への悪影響を回避できるので好ましい。また、転写
ベルトは前述のように、引張り強度が大であるので、ベ
ルトの歪みや断裂などの発生のおそれがなく、常時安定
して転写を行なうことができる。In this way, the static elimination brush can be small, which is preferable since it is possible to avoid the adverse effect on the image due to hair loss. Further, as described above, since the transfer belt has high tensile strength, there is no risk of distortion or tearing of the belt, and stable transfer can be performed at all times.
第3図は本発明の他の実施例を示すものである。この装
置においては、回転円筒状の感光体11表面に、それぞ
れイエロー、シアン、マゼンタおよび黒色のトナーを収
納した4個の現像器36a、36b、36c、36dに
よッテ、周知のプロセスで順次カラートナー像を形成し
、一方、感光体11に当接配置した転写ドラム31表面
に付着した転写材にカラートナー像を、各色ごとに複数
回転写してカラー画像を形成するものとする。FIG. 3 shows another embodiment of the invention. In this apparatus, four developing units 36a, 36b, 36c, and 36d each containing yellow, cyan, magenta, and black toner are sequentially loaded onto the surface of a rotating cylindrical photoreceptor 11 using a well-known process. A color toner image is formed, and the color toner image is transferred multiple times for each color onto a transfer material attached to the surface of a transfer drum 31 placed in contact with a photoreceptor 11 to form a color image.
図示の装置において、転写ドラム31は、アルミニュー
ム、SUSなどからなる枠体−ヒに前述の、第2図に示
したような、表層を、体積抵抗が108〜】0応Ωcm
程度に調整した半導電性エラストマとし、裏面を絶縁樹
脂層とした重層構造のシートを貼着形成しである。In the illustrated apparatus, the transfer drum 31 has a frame body made of aluminum, SUS, etc., and a surface layer as shown in FIG.
It is made of a semiconductive elastomer that has been adjusted to a certain degree, and a multilayered sheet with an insulating resin layer on the back side is attached and formed.
図示の装置の場合の転写ベルトとしては、半導電層の厚
みは5071m、接着層の厚み30LLm、絶縁樹脂層
の厚みl OOg、mのものを使用した。The transfer belt used in the illustrated apparatus had a semiconductive layer with a thickness of 5071 m, an adhesive layer with a thickness of 30 LLm, and an insulating resin layer with a thickness of lOOg, m.
図示の装置の作動について略述すると、転写材は転写帯
電と同極性の電圧が印加された吸着帯電器37とアース
されたブラシ38の作用によって転写ドラム31に静電
吸着され、その後、前記帯電器37はオフされ、ブラシ
38も転写ドラム31から解除される。To briefly describe the operation of the illustrated device, the transfer material is electrostatically attracted to the transfer drum 31 by the action of the adsorption charger 37 to which a voltage of the same polarity as the transfer charge is applied and the grounded brush 38, and then The device 37 is turned off and the brush 38 is also released from the transfer drum 31.
ついで転写材には、感光体11J−のトナー像と逆極性
の電圧が印加された導電性弾性ブレード32による電界
によって、感光体11上のトナー像が転写される。この
ような転写操作が4回くり返されて転写材にはカラー画
像が形成され、その後、一対の除電器39によって除電
されるとともに、分離爪40によって転写ドラム31か
ら分離され、さらに不図示の定着部位に搬送されるもの
とする。Next, the toner image on the photoreceptor 11 is transferred onto the transfer material by an electric field generated by the conductive elastic blade 32 to which a voltage of opposite polarity to that of the toner image on the photoreceptor 11J- is applied. Such a transfer operation is repeated four times to form a color image on the transfer material, which is then neutralized by a pair of static eliminators 39, separated from the transfer drum 31 by separation claws 40, and then separated from the transfer drum 31 (not shown). It is assumed that the image is transported to a fixing site.
従来、この種の装置における転写ドラムはのシートは、
その帯電能のみを考慮して構成されているのが普通であ
ったので、たるみやしわが発生しやすく、長期の使用に
よって転写不良を発生するおそれがあったが、本装置に
おいては、強度の大きい材料でシー]・が形成してあり
、前記実施例の場合と同様に除電も容易であるので、転
写不良や色ズレを起すおそれなく、長期にわたって常時
安定した転写が可能となった。Conventionally, the sheet of the transfer drum in this type of device is
Normally, the device was constructed with only the charging ability in mind, so sagging and wrinkles were likely to occur, and there was a risk of poor transfer due to long-term use. Since the sheet is made of a large material and the static electricity can be easily removed as in the case of the above embodiment, stable transfer is possible at all times over a long period of time without the risk of transfer failure or color misregistration.
なお、転写ベルトの半導電層としてポリフッ化ビニリデ
ンを用いると、その誘電率が比べて大きいので、吸着用
帯電器37の印加電圧を3.5−4Kv程度と低くして
も、転写材を転写ドラムに強力に吸着させることができ
る。Note that when polyvinylidene fluoride is used as the semiconductive layer of the transfer belt, its dielectric constant is relatively large. It can be strongly adsorbed to the drum.
第4図は本発明のさらに他の実施例を示すものであり、
感光体、転写ベルト、これを懸架する導電性ローラなと
は前記第1図々示のものと同様であり、対応する部材に
は同一・の符号を付して示しである。FIG. 4 shows still another embodiment of the present invention,
The photoreceptor, the transfer belt, and the conductive roller that suspends it are the same as those shown in the first figure, and corresponding members are designated with the same reference numerals.
転写ベルト12は前述のものと同様、半導電層と絶縁樹
脂層とからなるものとする。The transfer belt 12 is made of a semi-conductive layer and an insulating resin layer, as described above.
感光体表面に形成されたトナー像は、転写ベルト12を
挟んで感光体11と反対側に配設され、電源14によっ
てトナーと逆極性の電圧が印加された導電性ブレード4
3の作用によって、感光体と転写ベルトが当接する転写
部位において転写材に転写される。The toner image formed on the surface of the photoreceptor is transferred to a conductive blade 4 disposed on the opposite side of the photoreceptor 11 with the transfer belt 12 in between, and to which a voltage of opposite polarity to the toner is applied by a power source 14.
By the action of 3, the image is transferred to the transfer material at the transfer site where the photoreceptor and the transfer belt come into contact.
該導電性ブレード43ば、前記第1の実施例において説
明17た熱可塑性エラストマ類または品分−fポリエチ
レンなどにカーホンブラック、金属粉などの導電+!I
フィーラを混在させるか材料のポリマ4vI造を変化さ
ゼて体積抵抗103〜108ΩC111の範囲に調整し
たものとし、厚みは0.03〜5mmとするのが好適で
ある。The conductive blade 43 is made of the thermoplastic elastomer described in the first embodiment or a conductive material such as polyethylene, carphone black, metal powder, etc. I
It is preferable that the volume resistivity be adjusted to a range of 10 3 to 10 8 ΩC111 by mixing a feeler or changing the polymer 4VI structure of the material, and that the thickness be 0.03 to 5 mm.
転写に寄与しなかったトナーは、転写ベルトの走行にと
もなってクリーニング装置45の位置に至り、これに装
着された導電性のクリーニングブレード44によって除
去されるものとする。It is assumed that the toner that did not contribute to the transfer reaches the cleaning device 45 as the transfer belt travels, and is removed by the conductive cleaning blade 44 attached to the cleaning device 45.
導電性クリーニングブレード44は、5BR1BR,E
PDM、ウレタン、シリコンゴム、クロロプレンなどに
カーボンブラックその他の導電にIフィーラを配合して
なるものを用い、硬度は50〜80° (JISA硬度
)の範囲内のものが好適である。The conductive cleaning blade 44 is 5BR1BR,E
It is preferable to use PDM, urethane, silicone rubber, chloroprene, etc. mixed with carbon black or other conductive I-filler, and the hardness is preferably in the range of 50 to 80° (JISA hardness).
転写ベルト12を挟んで、前記クリーニングブレードの
対向位置には、アルミニューム、SUSなどの導電材料
からなる導′屯性板体46が配設してあり、前記ブレー
ド440作用を確実ならしめる裏打部材となっていると
ともに、前記導電性板体46と相まって、ベルト表面に
蓄積される電荷の除電を行なうものとする。A conductive plate body 46 made of a conductive material such as aluminum or SUS is disposed at a position facing the cleaning blade across the transfer belt 12, and is a backing member that ensures the operation of the blade 440. In addition, together with the conductive plate 46, the electric charge accumulated on the belt surface is eliminated.
この場合、転写ベルト12の表面層の体積抵抗が108
〜10+5Ωcmに調整しであるので、除電部材として
ブラシのような尖鋭な先端を有するものあるいはコロナ
放電器などを使用しなくとも、前述のようなブレード部
材によって充分に除電を行なうことができる。In this case, the volume resistance of the surface layer of the transfer belt 12 is 108
Since it is adjusted to ~10+5 Ωcm, the static electricity can be sufficiently eliminated by the blade member as described above, without using an object with a sharp tip such as a brush or a corona discharger as the static elimination member.
この装置によるときは、ブラシを使用することによる毛
抜け、これに基ずく画像の劣化などの発生を回避でき、
またコストダウンにも有効である。When using this device, hair loss caused by using a brush and image deterioration due to this can be avoided.
It is also effective in reducing costs.
(3)発明の効果
以−L説明したように、本発明によるときは、像111
乃体とこれに接触する転写材保持搬送手段とをそなえた
画像形成装置において、該搬送下段の体積抵抗、機械的
強度を適当に設定することによって、チャージアップ現
象によって蓄積される電荷の除電に、前記搬送下段の+
1J方向全長にわたる除電「段を必要とぜず、極めて小
型の除電ブラシ、導電性ブレードなどの除重手段による
ことが可能であるので、コストダウン、搬送手段まわり
の省スペース化に有効であり、また、除電手段として、
除電ブラシを用いる場合における工抜けによる画像への
悪影響を回避することができ、導電性ブレードを用いる
場合には、これにクリーニング機能を奏させることによ
って、さらに構成の簡略化をはかることが可能である。(3) Effects of the invention As explained above, according to the present invention, the image 111
In an image forming apparatus equipped with a body and a transfer material holding and conveying means in contact with the body, by appropriately setting the volume resistance and mechanical strength of the lower stage of conveyance, it is possible to eliminate charges accumulated due to the charge-up phenomenon. , + of the lower transport stage
Static neutralization over the entire length in the 1J direction does not require stages and can be done using extremely small static neutralizing brushes, conductive blades, or other weight removing means, which is effective in reducing costs and saving space around the conveyance means. In addition, as a static elimination means,
When using a static eliminating brush, it is possible to avoid the negative effects on the image due to omissions, and when using a conductive blade, it is possible to further simplify the configuration by having it perform a cleaning function. be.
また、前記転写材保持搬送手段には、表層に比較的高誘
電率の半導電性材料を使用することによって電荷がのり
やすく、転写材を強力に吸着保持するので、転写ズレ、
カラーコピー時における色ズレを有効に防1ト17て良
質の画像を得られるどとも(こ、表面には機械的強度の
大きい材料を使用することによって、転写材保持搬送手
段の変形、損傷を阻II−シて、長期にわたって安定し
た転写機能を維持することがで、きる。In addition, since the transfer material holding and conveying means uses a semiconductive material with a relatively high dielectric constant for the surface layer, it is easy to carry an electric charge and strongly adsorbs and holds the transfer material, thereby preventing transfer misalignment.
It is possible to effectively prevent color misregistration during color copying (17) and obtain high-quality images (by using a material with high mechanical strength for the surface, deformation and damage to the transfer material holding and conveying means can be prevented). This can be achieved by maintaining stable transcriptional function over a long period of time.
第1図は本発明を適用した画像形成装置のとくに転写材
搬送機構部分を示す実施例の斜面図、第2図は同り転写
材保持搬送手段たる転写ベルトの一部の断面図、
第3図および第4図は本発明の他の実施態様を示す要部
側面図である。
11φ争φ感光体、12゜。。転写ベルト、13・・・
転写ローラ、]5.16・・φ導電性ロラ、17−−−
除電ブラシ、31・―・転写I・ラム、36a、36b
、36e、36d−@−現像器、43・・・導電性ブレ
ード、44・・・導’jl性クリーニングブレード、4
6・・・導電性板体。
手−系売ネ由−i]7L M÷ (方式)平成元年4月
7日
特許庁長官 吉 1)文 毅 殿
1 事件の表示
特願昭63−300705
2 発明の名称
画像Jfニ成装置
補止をする省
事件との関係 出願人
住所
名称 キャノン株式会社FIG. 1 is a perspective view of an embodiment of an image forming apparatus to which the present invention is applied, particularly showing the transfer material conveyance mechanism, FIG. 4 and 4 are side views of main parts showing other embodiments of the present invention. 11φ photoreceptor, 12°. . Transfer belt, 13...
Transfer roller, ]5.16...φ conductive roller, 17---
Static elimination brush, 31...Transfer I/ram, 36a, 36b
, 36e, 36d-@-developing device, 43... conductive blade, 44... conductive cleaning blade, 4
6... Conductive plate. 7L M÷ (Method) April 7, 1989 Director General of the Japan Patent Office Yoshi 1) Tsuyoshi Moon 1 Patent Application for Display of Cases 1983-300705 2 Device for generating name image Jf of invention Relationship with the Ministry case for supplementation Applicant address name Canon Co., Ltd.
Claims (4)
る転写材保持搬送手段とをそなえた画像形成装置におい
て、 前記転写材保持搬送手段が、体積抵抗が10^8〜10
^1^5Ωcmの範囲内にある表層と、引張り強度が3
00Kg/cm^2以上の裏層とからなる重層構成のシ
ート状部材からなることを特徴とする画像形成装置。(1) In an image forming apparatus including an image carrier and a transfer material holding and conveying means that adsorbs and conveys a transfer material in contact with the image carrier, the transfer material holding and conveying means has a volume resistivity of 10^8 to 10.
The surface layer is within the range of ^1^5 Ωcm and the tensile strength is 3
An image forming apparatus comprising a sheet-like member having a multilayer structure and a back layer of 00 kg/cm^2 or more.
デン、ポリオレフィン系熱可塑性エラストマ、ポリエス
テル系熱可塑性エラストマ、ポリウレタン系熱可塑性エ
ラストマ、ポリスチレン系熱可塑性エラストマ、ポリア
ミド系熱可塑性エラストマ、フッ素系熱可塑性エラスト
マ、ポリブタジエン系熱可塑性エラストマ、ポリエチレ
ン系熱可塑性エラストマ、エチレン−酢酸ビニール系熱
可塑性エラストマ、ポリ塩化ビニール系熱可塑性エラス
トマから選択された熱可塑性エラストマからなることを
特徴とする特許請求の範囲第1項記載の画像形成装置。(2) The surface layer of the transfer material holding and conveying means is made of polyvinylidene fluoride, polyolefin thermoplastic elastomer, polyester thermoplastic elastomer, polyurethane thermoplastic elastomer, polystyrene thermoplastic elastomer, polyamide thermoplastic elastomer, or fluorine thermoplastic elastomer. Claim 1: The invention is made of a thermoplastic elastomer selected from elastomer, polybutadiene thermoplastic elastomer, polyethylene thermoplastic elastomer, ethylene-vinyl acetate thermoplastic elastomer, and polyvinyl chloride thermoplastic elastomer. The image forming apparatus described in .
タレート、フッ素樹脂、ポリエチレン、ポリアミド、ポ
リイミド、ポリカーボ、ポリサルフォンから選択された
樹脂層であることを特徴とする特許請求の範囲第1項ま
たは第2項のいずれか記載の画像形成装置。(3) Claim 1 or 2, characterized in that the back layer of the transfer material holding and conveying means is a resin layer selected from polyethylene terephthalate, fluororesin, polyethylene, polyamide, polyimide, polycarbo, and polysulfone. The image forming apparatus according to any one of paragraphs.
部位において、これと同期走行するエンドレス部材であ
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
画像形成装置。(4) The image forming apparatus according to any one of claims 1 to 3, wherein the transfer material holding and conveying means is an endless member that travels synchronously with the image carrier at a transfer site that comes into contact with the image carrier.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30070588A JPH02148074A (en) | 1988-11-30 | 1988-11-30 | Image forming device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30070588A JPH02148074A (en) | 1988-11-30 | 1988-11-30 | Image forming device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02148074A true JPH02148074A (en) | 1990-06-06 |
Family
ID=17888095
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP30070588A Pending JPH02148074A (en) | 1988-11-30 | 1988-11-30 | Image forming device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02148074A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6615016B2 (en) | 2000-08-08 | 2003-09-02 | Canon Kabushiki Kaisha | Transfer medium bearing member and image forming apparatus employing transfer medium bearing member |
US7466935B2 (en) * | 2002-10-10 | 2008-12-16 | Oce Printing Systems Gmbh | Transferring and fixing system and method using a guided conveyor section and a free conveyor section |
-
1988
- 1988-11-30 JP JP30070588A patent/JPH02148074A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6615016B2 (en) | 2000-08-08 | 2003-09-02 | Canon Kabushiki Kaisha | Transfer medium bearing member and image forming apparatus employing transfer medium bearing member |
US7466935B2 (en) * | 2002-10-10 | 2008-12-16 | Oce Printing Systems Gmbh | Transferring and fixing system and method using a guided conveyor section and a free conveyor section |
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