JPH01219854A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH01219854A JPH01219854A JP63046044A JP4604488A JPH01219854A JP H01219854 A JPH01219854 A JP H01219854A JP 63046044 A JP63046044 A JP 63046044A JP 4604488 A JP4604488 A JP 4604488A JP H01219854 A JPH01219854 A JP H01219854A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- temperature
- developing
- image forming
- developing device
- 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
- 238000001816 cooling Methods 0.000 claims abstract description 23
- 238000011161 development Methods 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 12
- 230000002776 aggregation Effects 0.000 abstract description 15
- 238000004220 aggregation Methods 0.000 abstract description 13
- 230000006866 deterioration Effects 0.000 abstract description 2
- 238000012546 transfer Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000010410 layer Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 108091008695 photoreceptors Proteins 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、電子写真・静電印刷（静電記録）・磁気記録
等の適宜の作像方式により感光体・誘電体・磁性体等の
像担持体面に形成した潜像（静電荷潜像・電位潜像・磁
気潜像等）を粉体く乾式）現像剤により顕像化する粉体
現像方式の画像形成装置（複写機・プリンタ・ファクシ
ミリ・画像表示装置等）に関する。Detailed Description of the Invention (Industrial Field of Application) The present invention is directed to the production of photoreceptors, dielectric materials, magnetic materials, etc. using appropriate image forming methods such as electrophotography, electrostatic printing (electrostatic recording), and magnetic recording. Powder development type image forming devices (copiers, printers, facsimiles, image display devices, etc.).
（従来の技術）
第７図は粉体現像方式の画像形成装置の一例の概略構成
を示している。本例の画像形成装置は回転ドラム型・光
学系移動型・転写方式の電子写真複写機であり、この複
写機構成及び作像原理・プロセスはよく知られているも
のであるので簡単に説明するにとどめる。(Prior Art) FIG. 7 shows a schematic configuration of an example of an image forming apparatus using a powder development method. The image forming apparatus in this example is a rotating drum type, optical system moving type, transfer type electrophotographic copying machine.The configuration of this copying machine and the image forming principle/process are well known, so they will be briefly explained. Stay within.
即ち、１は矢示方向に所定の周速度で回転駆動される像
担持体としてのドラム型電子写真感光体（以下ドラムと
記す）、２は該ドラム周面な正極性又は負極性に一様に
帯電する一次帯電器、３は固定の原稿台ガラス、４はそ
の上に画像面下向きで載置セットした原稿、５ａ〜５ｆ
は上記原稿の下向き画像面を走査してドラム１面に結像
露光りする原稿走査露光光学系であり、５ａは移動照明
ランプ、５ｂは移動第１ミラー、５Ｃは移動第２ミラー
、５ｄは移動第３ミラー、５ｅは結像レンズ、５ｆは固
定ミラーである。６は一次帯電器２による帯電処理と画
像露光してドラム１面に順次に形成される静電荷潜像を
顕像化する粉体現像装置、７は転写帯電器、８は不図示
の給紙機構から給送された転写材Ｐをドラム１の回転と
同期とりしてトラム１と転写帯電器７との間に給送する
しジスタローラ、１０は定着器、９は像転写を受けてド
ラム１面から分離された転写材を定着器へ搬送するベル
ト装置、１１は像転写後のドラム１面を清浄化するクリ
ーニング装置、１２はドラム１面の残存電荷を一様除電
する前露光ランプである。That is, 1 is a drum-type electrophotographic photosensitive member (hereinafter referred to as a drum) as an image bearing member that is rotationally driven in the direction of the arrow at a predetermined circumferential speed, and 2 is a drum-type electrophotographic photoreceptor (hereinafter referred to as a drum) that is uniformly polarized on the circumferential surface of the drum. 3 is a fixed document table glass, 4 is a document placed on it with the image surface facing downward, 5a to 5f
is a document scanning exposure optical system that scans the downward image surface of the document and forms an image on the drum surface, 5a is a movable illumination lamp, 5b is a movable first mirror, 5C is a movable second mirror, and 5d is a movable second mirror. A movable third mirror, 5e is an imaging lens, and 5f is a fixed mirror. Reference numeral 6 denotes a powder developing device that performs charging processing by the primary charger 2 and image exposure to visualize electrostatic latent images sequentially formed on the surface of the drum, 7 a transfer charger, and 8 a paper feeder (not shown). The transfer material P fed from the mechanism is synchronized with the rotation of the drum 1 and is fed between the tram 1 and the transfer charger 7, and the transfer material P is fed between the tram 1 and the transfer charger 7. A belt device conveys the transfer material separated from the surface to a fixing device, a cleaning device 11 cleans the surface of the drum after image transfer, and a pre-exposure lamp 12 uniformly eliminates residual charges on the surface of the drum. .
粉体現像装置６としては現像剤として１成分系現像剤を
用いるもの、２成分系現像剤を用いるもの、その他種々
の構成・方式のものが有る。The powder developing device 6 includes those using a one-component developer, those using a two-component developer, and those having various other configurations and systems.
第８図にその一例を示した。本例の粉体現像装置は現像
剤として１成分磁性現像剤を用いるものである。同図（
Ａ）は装置の横断面図、同図（Ｂ）は現像スリーブの縦
断面図である。２０は現像剤容器であり、１成分磁性現
像剤（トナー）ｔを収容させである。２１は現像剤担持
部材としての現像スリーブであり、アルミニウム・ステ
ンレススチールなどの非磁性材製である。該現像スリー
ブ２１は現像剤容器２０内の底部に左側面を容器外部に
露出させ、両端軸部を軸受２２・２２で回転自由に軸受
させて横設しである。２３は該現像スリーブ１の内空に
挿入内臓させた磁界発生手段としてのマグネットローラ
である。このローラは非回転の不動ローラであり、現像
スリーブ２１はこのローラ２３の外周りを不図示の駆動
機構により欠字の反時計方向に所定の周速度で回転駆動
される。２３ａ ・２’３ｂ ・２３ｃ −２３ｄはロ
ーラ２３の周囲の所定位置に設けた磁性である。２４は
現像スリーブの上面側に下辺を現像スリーブ面との間に
所定の僅小な間隙を存して対向させて配設した現像剤層
厚規制部材としてのドクターブレード、２５は該ブレー
ドの両端側に設けたブレート位置規制部材でる。２６は
現像スリーブの両端部側にスリーブ面に密着させて配設
した現像剤もれ出し防止用部材（パツキン材）であり、
この部材により現像スリーブの長手方向両端側から外方
への現像剤のもれ出しが阻止される。An example is shown in FIG. The powder developing device of this example uses a one-component magnetic developer as the developer. Same figure (
A) is a cross-sectional view of the device, and (B) is a vertical cross-sectional view of the developing sleeve. 20 is a developer container, which contains a one-component magnetic developer (toner) t. A developing sleeve 21 serves as a developer carrying member, and is made of a non-magnetic material such as aluminum or stainless steel. The developing sleeve 21 is horizontally disposed at the bottom of the developer container 20 with its left side surface exposed to the outside of the container, and both end shaft portions are rotatably supported by bearings 22. A magnet roller 23 is inserted into the inner space of the developing sleeve 1 and serves as a magnetic field generating means. This roller is a non-rotating, stationary roller, and the developing sleeve 21 is driven to rotate around the outer circumference of the roller 23 in a counterclockwise direction (not shown) at a predetermined circumferential speed by a drive mechanism (not shown). 23a, 2'3b, 23c and 23d are magnetic elements provided at predetermined positions around the roller 23. Reference numeral 24 denotes a doctor blade as a developer layer thickness regulating member disposed on the upper surface side of the developing sleeve with its lower side facing the developing sleeve surface with a predetermined small gap, and 25 denotes both ends of the blade. There is a blade position regulating member installed on the side. 26 is a developer leakage prevention member (packing material) disposed on both end sides of the developing sleeve in close contact with the sleeve surface;
This member prevents the developer from leaking outward from both longitudinal ends of the developing sleeve.
２７は現像バイアス電源であり、現像スリーブ２１と像
担持体としてのドラム１との対向部である現像領域ａに
交番電界又は／及び直流電界を印加する。A developing bias power supply 27 applies an alternating electric field and/or a direct current electric field to the developing area a, which is the opposing portion of the developing sleeve 21 and the drum 1 serving as an image carrier.
現像スリーブ２１の右側のほぼ半周面は容器２０内の１
成分磁性現像剤ｔに常時接触していて現像剤の供給を受
け、スリーブ面近傍の現像剤がスリーブ内部のマグネッ
トローラ２３の磁気カブスリーブ面に磁気吸着層として
付着担持される。Approximately half the circumferential surface on the right side of the developing sleeve 21 is located inside the container 20.
It is constantly in contact with the component magnetic developer t and receives developer supply, and the developer near the sleeve surface is adhered and carried as a magnetic adsorption layer on the magnetic cube sleeve surface of the magnet roller 23 inside the sleeve.
その担持現像剤層はスリーブ２１の回転に伴ない上記磁
気力とスリーブ面との摩擦力でスリーブ外面に担持保持
されてドクターブレード２４の方向へ搬送され、スリー
ブ２１とプレード２４との間隙を通過していくことによ
り所定の層厚の薄型布層に整層化され、その現像剤の薄
型布層が引続くスリーブ２１の回転で現像領域ａへ搬送
されていく。As the sleeve 21 rotates, the supported developer layer is held on the outer surface of the sleeve by the magnetic force and the frictional force between the sleeve surface and is conveyed toward the doctor blade 24, passing through the gap between the sleeve 21 and the blade 24. As a result, the developer is layered into a thin cloth layer of a predetermined thickness, and the thin cloth layer of the developer is conveyed to the developing area a by the subsequent rotation of the sleeve 21.
現像剤ｔは回転するスリーブ２１との接触摺擦、ブレー
ト２４との接触摺擦、スリーブ２１の回転に伴なう容器
２０内の現像剤の流動、容器２０内に現像剤攪拌部材を
配設した場合における該部材による攪拌流動などにより
所定磁性に摩擦帯電される。The developer t comes into contact with the rotating sleeve 21, comes into contact with the plate 24, flows within the container 20 as the sleeve 21 rotates, and a developer stirring member is provided inside the container 20. In this case, the member is triboelectrically charged to a predetermined magnetic property due to stirring and flow caused by the member.
現像スリーブ２１面に担持され、現像領域ａに搬送され
た現像剤ｆ＋ｉ塗布層の現像剤はドラム１面側の潜像パ
ターンに対応してドラム１面側へ選択的に移動付着し、
ドラム１面が現像領域ａを通過していくことにより潜像
の現像ａが順次実行されていく。The developer of the developer f+i coating layer carried on the surface of the developing sleeve 21 and conveyed to the developing area a selectively moves and adheres to the drum 1 side in accordance with the latent image pattern on the drum 1 side,
As the surface of the drum passes through the development area a, the development a of the latent image is sequentially performed.
現像に供されずにスリーブ２３面側に残った現像剤は引
続くスリーブ２３の回転により容器２０内へ戻し搬送さ
れる。The developer remaining on the surface of the sleeve 23 without being subjected to development is transported back into the container 20 by the subsequent rotation of the sleeve 23.
（発明が解決しようとする問題点）
画像形成装置の内部（外装筺の内空）は、装置稼動によ
り定着器１０が熱式である場合には加熱ヒータの発熱、
照明ランプ５ａの発熱、駆動機構・動力伝達機構・可動
機構等の駆動・運動に伴なう摩擦発熱・通電発熱などに
より昇温（機内昇温）していく。機内の過度の昇温は装
置の画像形成機能に悪影響を及ぼすから装置には排気フ
ァンを設けて機内にこもる熱気を排気して過度の機内昇
温を押えるようにしている。(Problems to be Solved by the Invention) The interior of the image forming apparatus (inner space of the exterior housing) is exposed to heat generated by the heater when the fixing device 10 is a thermal type due to the operation of the apparatus.
The temperature rises (temperature rise inside the machine) due to heat generated by the illumination lamp 5a, frictional heat generated by the drive/movement of the drive mechanism, power transmission mechanism, movable mechanism, etc., heat generated by energization, and the like. Since an excessive rise in temperature inside the machine has a negative effect on the image forming function of the apparatus, the apparatus is equipped with an exhaust fan to exhaust hot air trapped inside the machine to suppress excessive rise in temperature inside the machine.
現像装置６については装置内の収容現像剤ｔに昇温によ
る悪影響をみやすく、過度の昇温で凝集度が上昇し、現
像剤粒子（トナー）相互が塊状に凝集化し現像剤の全体
的な流動状態が悪化する。As for the developing device 6, it is easy to see the adverse effects of temperature rise on the developer t stored in the device, and excessive temperature rise increases the degree of aggregation, causing developer particles (toner) to aggregate into clumps and causing overall flow of the developer. Condition worsens.
特に現像剤粉体の粒径を小粒径化したものの場合にはこ
の昇温−凝集化現象を顕著に生じる。その為、現像剤が
適正の帯電量を得られず、現像性能か低下し、出力画像
濃度が低下したり、画質がガサガサとなり、とびちりや
尾引き状の低画質となり、現像障害を生じるようになる
。In particular, when the particle size of the developer powder is reduced, this temperature rise-agglomeration phenomenon occurs significantly. As a result, the developer may not be able to obtain the appropriate amount of charge, resulting in poor development performance, decreased output image density, rough image quality, poor image quality with spots or trailing, and development problems. Become.
而して前記したように排気ファンにより画像形成装置機
内の過度の昇温を極力押えるようにはされているが、現
像装置自体もその稼動に伴ない発熱昇温する。即ち、現
像スリーブ２１の回転駆動に伴ない、このスリーブ２１
の両端部の周面と、該周面に密着接触している現像剤も
れ出し防止部材２６・２６やブレード位置規制部材２５
との慴動部Ａで接触摩擦発熱を生じる。又、現像スリー
ブ２１をすべり軸受のような面接触支持方式の軸受２２
・２２で軸受けさせた構成の場合は特にその相互摺動部
Ｂで摩擦熱が多量に発生する。As described above, although the exhaust fan is used to suppress excessive temperature rise inside the image forming apparatus as much as possible, the developing apparatus itself also generates heat and rises in temperature as it operates. That is, as the developing sleeve 21 is rotated, this sleeve 21
and the developer leakage prevention members 26, 26 and the blade position regulating member 25 that are in close contact with the circumferential surfaces at both ends.
Contact friction generates heat at the sliding part A. Further, the developing sleeve 21 is mounted on a surface contact type bearing 22 such as a sliding bearing.
- In the case of a configuration in which bearings are provided at 22, a large amount of frictional heat is generated especially at the mutually sliding portion B.
上記のような摩擦熱の蓄熱により現像装置及び収容現像
剤が現像装置の稼動に伴ない昇温していく。更に近時の
画像形成装置は小型化されて潜像装置６と定着器１０と
が互いに接近した配置設計のものも多く、現像装置６が
定着器１０の熱気を直接的に受けて昇温を受けやすい。Due to the accumulation of frictional heat as described above, the temperature of the developing device and the stored developer increases as the developing device operates. Furthermore, recent image forming apparatuses have become smaller and are often designed so that the latent image device 6 and the fixing device 10 are placed close to each other. Easy to accept.
その為、画像形成装置の長時間稼動時などにおいては、
現像装置や収容現像剤が上記のような装置慴動部Ａ−Ｂ
における摩擦熱の蓄積、定着器等の他の発熱源からの熱
の蓄積で過度の昇温状態に至りやすく、実際上、現像装
置・現像剤の過度の昇温に伴なう現像障害、出力画質の
低下をみるケースも少なくなく、問題とされている。Therefore, when the image forming apparatus is operated for a long time,
Device moving parts A-B where the developing device and stored developer are as described above.
Accumulation of frictional heat in the machine and accumulation of heat from other heat sources such as the fixing device can easily lead to excessive temperature rise, and in fact, development problems and output due to excessive temperature rise of the developing device and developer. There are many cases where image quality deteriorates, which is considered a problem.
本発明は上記のような問題を解消することを目的とする
。The present invention aims to solve the above problems.
（問題点を解決するための手段）
本発明は、粉体現像方式の画像形成装置において、現像
装置の蓄熱な積Ｖｉ奪熱して該装置を摂氏４５°Ｃ以下
の温度状態に維持させる現像装置冷却手段を具備してい
ることを特徴とする画像形成装置である。(Means for Solving the Problems) The present invention provides a developing device that maintains the device at a temperature of 45° C. or lower by absorbing heat accumulated in the developing device in an image forming device using a powder developing method. The image forming apparatus is characterized in that it includes a cooling means.
（作用）
現像装置冷却手段を具備させて現像装置の蓄熱を積極奪
熱して現像装置を摂氏４５０Ｃ以下の温度状態に維持さ
せることにより、現像剤は昇温による凝集度が抑制され
、画像形成装置を長時間稼動させた場合でも現像剤の昇
温−凝集化に起因する現像障害、出力画質の低下を厳に
防止することができる。(Function) By providing a developing device cooling means and actively removing heat stored in the developing device to maintain the developing device at a temperature of 450 C or less, the degree of aggregation of the developer due to temperature rise is suppressed, and the image forming device Even when the system is operated for a long time, it is possible to strictly prevent development problems and deterioration of output image quality due to temperature rise and agglomeration of the developer.
（実施例）
例−１（第１図）
本例は現像装置６の現像剤容器２０の外側に容器２０に
接近させて冷却用ファン３０を配設し、画像形成装置の
稼動中はこのファン３０を駆動させて不図示のダクト等
で導入した装置外の外気を現像剤容器２０の外面に吹き
付けて装置温度を積極的に降下させ現像装置６を４５°
Ｃ以下の温度状態に保持させるものである。ファン３０
は電源制御装置３１の信号によって駆動型＠３２から電
力供給され駆動される。(Embodiment) Example 1 (Fig. 1) In this example, a cooling fan 30 is disposed on the outside of the developer container 20 of the developing device 6 and close to the container 20. 30 is driven to blow the outside air introduced from outside the apparatus through a duct (not shown) onto the outer surface of the developer container 20 to actively lower the apparatus temperature and tilt the developing apparatus 6 to 45°.
This is to maintain the temperature below C. fan 30
is supplied with power from the drive type @32 and driven by a signal from the power supply control device 31.
ファン３０の外気吹き付けによる現像装置６の温度降下
は、外気が直接に吹き付けられる現像剤容器２０から始
まり、収容現像剤ｔ、ドクターブレード２４、現像スリ
ーブ２１の順に進む。前述第８図（八） 、 （Ｂ）で
説明した現像剤もれ出しを防止部材２６・２６やブレー
ド位置規制部材２５と、現像スリーブ２１との摺動部Ａ
−Ｂにおける接触摩擦熱による昇温も、上記の外気吹き
付けによる装置温度の降下により、ある特定温度以下に
抑えることが可能となる。The temperature drop in the developing device 6 due to the outside air blown by the fan 30 starts from the developer container 20 to which the outside air is directly blown, and then proceeds to the stored developer t, the doctor blade 24, and the developing sleeve 21 in this order. The sliding portion A between the developer leakage preventing members 26 and the blade position regulating member 25 and the developing sleeve 21 explained in FIGS. 8(8) and 8(B) above.
The temperature rise due to contact friction heat in -B can also be suppressed to below a certain temperature by lowering the device temperature due to the above-mentioned outside air blowing.
尚、図中２８は現像剤容器２０内に配設した現像剤撹拌
棒を示し、矢示の時計方向に回転駆動される。In the drawing, reference numeral 28 indicates a developer stirring rod disposed within the developer container 20, which is rotated clockwise as indicated by an arrow.
ここで、現像剤の温度と凝集度についての実験結果につ
いて述べる。Here, experimental results regarding the temperature and degree of aggregation of the developer will be described.
第２図（Ａ）は現像装置のドクターブレード部分及び現
像スリーブ面の周辺現像剤について測定した温度とその
時の現像スリーブ周辺の現像剤の凝集度についてのグラ
フを示している。温度が上昇するにつれて、凝集度が上
昇することが読み取れる。特に温度が４５８Ｃを超え５
０°Ｃに達した時点では凝集度が極めて大きくなり、現
像剤として使用不可能となる。現像剤としては温度を４
５°Ｃ以下に抑える必要がある。又、この現象は第２図
（Ｂ）に示す温度と画像濃度の関係グラフに示されてい
るように、温度が４５００を超え、凝集度が急激に上昇
し悪化するのと同様に濃度が急激に低下する。第２図（
Ｃ）は凝集度と画質に藺しての関係グラフであるが、画
質も濃度と同様に凝集度が特定値以上に上昇すると悪く
なることがわかる。これらのグラフより、凝集度は６０
％以下、温度は４５°Ｃ以下が現像剤として実用使用可
能な条件と言うことができる。FIG. 2(A) shows a graph of the temperature measured for the developer around the doctor blade portion of the developing device and the surface of the developing sleeve, and the degree of aggregation of the developer around the developing sleeve at that time. It can be seen that as the temperature increases, the degree of aggregation increases. Especially when the temperature exceeds 458C5
When the temperature reaches 0°C, the degree of aggregation becomes extremely large and it becomes impossible to use it as a developer. As a developer, set the temperature to 4.
It is necessary to keep the temperature below 5°C. Also, as shown in the graph of the relationship between temperature and image density shown in Figure 2 (B), this phenomenon occurs when the temperature exceeds 4500°C and the degree of aggregation rapidly increases and deteriorates. decreases to Figure 2 (
C) is a graph showing the relationship between the degree of aggregation and image quality, and it can be seen that the image quality deteriorates as the degree of aggregation increases above a specific value, similar to the density. From these graphs, the degree of agglomeration is 60
% or less and the temperature is 45°C or less can be said to be the conditions under which it can be practically used as a developer.
例−２（第３図）
本例は冷却用ファンを使用せずに、ドクターブレード２
４上に冷却素子４０を使用した例である。ベルチェ効果
等を応用し−た冷却素子４０が使用可能である。直接ド
クターブレード２４の上に取り付けが可能なため、ドク
ターブレード２４や現像スリーブ２１周辺の摩擦熱の発
生する部材を直接冷却することが可能となり冷却効率が
良い。Example 2 (Figure 3) This example uses the doctor blade 2 without using a cooling fan.
This is an example in which a cooling element 40 is used on the cooling element 4. A cooling element 40 based on the Beltier effect or the like can be used. Since it can be attached directly onto the doctor blade 24, it is possible to directly cool members that generate frictional heat around the doctor blade 24 and the developing sleeve 21, resulting in good cooling efficiency.
例−３（第４図）
本例はドクターブレード２４の上に温度検知器５０を設
置し、ドクターブレード２４の温度が４５°Ｃ以上にな
らないように温度制御装置５１により電源制御装置３１
の作動を制御する。温度制御装置５１の制御設定温度を
任意に切り換えることにより各種の現像剤（トナー）の
特性に合わせて、温度制御が可能となる。Example 3 (Fig. 4) In this example, a temperature detector 50 is installed on the doctor blade 24, and the power supply control device 31 is controlled by the temperature control device 51 so that the temperature of the doctor blade 24 does not exceed 45°C.
control the operation of By arbitrarily switching the control setting temperature of the temperature control device 51, temperature control becomes possible in accordance with the characteristics of various types of developer (toner).
例−４（第５図）
第５図（Ａ）のものは現像スリーブ２１の内壁面に冷却
素子４０を貼り付けた構成にした例である。又、同図（
Ｂ）のようにマグネットローラ２３の芯金２３Ａに冷却
素子（４０）を接続、又は貼り付けるように構成するこ
とも可能である。Example 4 (FIG. 5) FIG. 5(A) is an example in which a cooling element 40 is attached to the inner wall surface of the developing sleeve 21. Also, the same figure (
It is also possible to configure the cooling element (40) to be connected or attached to the core bar 23A of the magnet roller 23 as shown in B).
例−５（第６図）
本例はマグネットローラ２３の一部分に温度検知器５０
を埋め込み現像スリーブ２１の円筒的温度を検知し、現
像スリーブ内壁面に貼付の冷却素子４０の温度を制御す
るものである。特にドクターブレード位置規制部材２５
と現像スリーブ２１の摺擦位置に温度検知器を設置する
と最大温度を検知するため、冷却効果が高くなる。Example 5 (Figure 6) In this example, a temperature sensor 50 is installed in a part of the magnet roller 23.
is embedded to detect the cylindrical temperature of the developing sleeve 21 and control the temperature of the cooling element 40 attached to the inner wall surface of the developing sleeve. In particular, the doctor blade position regulating member 25
If a temperature sensor is installed at the rubbing position of the developing sleeve 21, the maximum temperature will be detected, thereby increasing the cooling effect.
尚、冷却手段及び冷却素子は現像スリーブ及び現像器に
限らず、クリーニング装置１１や定着器１０にも適用で
きる。又、クリーニング装置内部で使用する円柱状のロ
ーラや、定着ローラ対の内部に冷却素子及び温度検知器
を設置することにより、前記実施例同様昇温防止や、温
度制御の効率か向上する。Note that the cooling means and the cooling element are not limited to the developing sleeve and the developing device, but can also be applied to the cleaning device 11 and the fixing device 10. Further, by installing a cooling element and a temperature sensor inside the cylindrical roller used inside the cleaning device and inside the pair of fixing rollers, temperature rise can be prevented and the efficiency of temperature control can be improved as in the previous embodiment.
（発明の効果）
以上説明したように、現像装置を冷却する手段を設ける
ことにより、現像装置及び現像剤の温度を４５°Ｃ以下
に抑制して現像剤の凝集度及び帯電量を適正に保つこと
により、現像効率の維持・向上を行い、現像画像の濃度
及び画質を安定又は向上させる効果がある。(Effects of the Invention) As explained above, by providing a means for cooling the developing device, the temperature of the developing device and the developer is suppressed to 45°C or less, and the degree of aggregation and the amount of charge of the developer are maintained appropriately. This has the effect of maintaining and improving development efficiency and stabilizing or improving the density and image quality of the developed image.
温度検知手段と併用することにより、現像装置及び現像
剤の温度を自動制御し、周辺環境や画像形成装置の使用
条件、又は現像剤の物理特性等の不安定要因に影響され
ずに、信頼性の高い画質を得られる。By using it in conjunction with a temperature detection means, the temperature of the developing device and developer can be automatically controlled, ensuring reliability without being affected by unstable factors such as the surrounding environment, usage conditions of the image forming device, or physical characteristics of the developer. You can obtain high image quality.
又、冷却手段を現像スリーブ内部に設けることにより熱
源を直接冷却可能にし、効率良く冷却できる。更に省ス
ペース化が可能となる。Further, by providing a cooling means inside the developing sleeve, the heat source can be directly cooled, and cooling can be performed efficiently. Furthermore, it becomes possible to save space.
以上の効果は、特に現像剤粉体粒径を小粒径化した場合
に、顕著な効果となる。The above effects become remarkable especially when the particle size of the developer powder is reduced.
第１図は第１実施例の構成略図、第２図（Ａ）は温度と
現像剤凝集度の関係測定グラフ、同図（Ｂ）は温度と画
像濃度の関係測定グラフ、同図（Ｃ）は現像剤凝集度と
画質の関係測定グラフ、第３図は第２実施例の構成略図
、第４図は第３実施例の構成略図、第５図（Ａ）、（Ｂ
）は第４実施例の構成略図、第６図は第５実施例の構成
略図、第７図は粉体現像方式の画像形成装置の一例の構
成略図、第８図（Ａ）は粉体現像装置の一例の横断面図
、同図（Ｂ）は現像スリーブ部分の縦断面図である。
１は像担持体としてのドラム型電子写真感光体、６は粉
体（乾式）現像装置、２０は現像剤容器、ｔは現像剤、
２１は現像スリーブ、３０は冷却ファン、４０は冷却素
子、５０は温度検知器。
特許出願人 キャノン株式会社
菊 ２ 図
（Ａ）
温度〔°Ｃ〕
（Ｂ）
高
第 ２ １１１Ｉ（Ｃ）
ｌｉ矛責【バを〔５６コ
第 ３ 図
第 ５ 図
（Ａ）
（Ｂ）
第 ６ ７
窮 ８ 閃
（Ａ）
（Ｂ）Figure 1 is a schematic diagram of the configuration of the first embodiment, Figure 2 (A) is a graph for measuring the relationship between temperature and developer aggregation degree, Figure 2 (B) is a graph for measuring the relationship between temperature and image density, Figure 2 (C) is a graph for measuring the relationship between temperature and image density. 3 is a schematic diagram of the structure of the second embodiment. FIG. 4 is a schematic diagram of the structure of the third embodiment.
) is a schematic diagram of the configuration of the fourth embodiment, FIG. 6 is a schematic diagram of the configuration of the fifth embodiment, FIG. 7 is a schematic diagram of the configuration of an example of a powder development type image forming apparatus, and FIG. 8(A) is a diagram of the powder development method. A cross-sectional view of an example of the apparatus, and FIG. 3(B) is a vertical cross-sectional view of a developing sleeve portion. 1 is a drum type electrophotographic photoreceptor as an image carrier, 6 is a powder (dry type) developing device, 20 is a developer container, t is a developer,
21 is a developing sleeve, 30 is a cooling fan, 40 is a cooling element, and 50 is a temperature sensor. Patent applicant: Canon Co., Ltd. Kiku 2 Figure (A) Temperature [°C] (B) High temperature 2 111I (C) Li blame [Ba [56] Figure 3 Figure 5 (A) (B) Figure 6 7 Plight 8 Flash (A) (B)
Claims (1)
の蓄熱を積極奪熱して該装置を摂氏４５°Ｃ以下の温度
状態に維持させる現像装置冷却手段を具備していること
を特徴とする画像形成装置。(1) A powder development type image forming apparatus is characterized in that it is equipped with a developing device cooling means that actively removes heat stored in the developing device to maintain the device at a temperature of 45° C. or less. Image forming device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63046044A JPH01219854A (en) | 1988-02-29 | 1988-02-29 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63046044A JPH01219854A (en) | 1988-02-29 | 1988-02-29 | Image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01219854A true JPH01219854A (en) | 1989-09-01 |
Family
ID=12736029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63046044A Pending JPH01219854A (en) | 1988-02-29 | 1988-02-29 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01219854A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009217067A (en) * | 2008-03-11 | 2009-09-24 | Sharp Corp | Image forming apparatus |
| JP2009300852A (en) * | 2008-06-16 | 2009-12-24 | Ricoh Co Ltd | Cooling apparatus, image forming apparatus, and cooling method |
| JP2013008065A (en) * | 2012-10-09 | 2013-01-10 | Ricoh Co Ltd | Image forming apparatus |
| US8401432B2 (en) | 2009-11-04 | 2013-03-19 | Sharp Kabushiki Kaisha | Developing device and image forming apparatus |
-
1988
- 1988-02-29 JP JP63046044A patent/JPH01219854A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009217067A (en) * | 2008-03-11 | 2009-09-24 | Sharp Corp | Image forming apparatus |
| JP2009300852A (en) * | 2008-06-16 | 2009-12-24 | Ricoh Co Ltd | Cooling apparatus, image forming apparatus, and cooling method |
| US8401432B2 (en) | 2009-11-04 | 2013-03-19 | Sharp Kabushiki Kaisha | Developing device and image forming apparatus |
| JP2013008065A (en) * | 2012-10-09 | 2013-01-10 | Ricoh Co Ltd | Image forming apparatus |
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