JPS6313064A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPS6313064A JPS6313064A JP15682086A JP15682086A JPS6313064A JP S6313064 A JPS6313064 A JP S6313064A JP 15682086 A JP15682086 A JP 15682086A JP 15682086 A JP15682086 A JP 15682086A JP S6313064 A JPS6313064 A JP S6313064A
- Authority
- JP
- Japan
- Prior art keywords
- image carrier
- image
- temperature
- charger
- electrostatic
- 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
- 238000009423 ventilation Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 abstract description 12
- 239000000463 material Substances 0.000 abstract description 5
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 108091008695 photoreceptors Proteins 0.000 description 15
- 238000012217 deletion Methods 0.000 description 8
- 230000037430 deletion Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000000454 talc Substances 0.000 description 3
- 229910052623 talc Inorganic materials 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【発明の詳細な説明】
イ、発明の目的
〔産業上の利用分野〕
本発明は画像形成装置に関する。更に詳しくは、感光体
会誘電体等の像担持体に電子写真・静電記録等の公知の
作像プロセスにより画像を形成する装置に関する。DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention [Field of Industrial Application] The present invention relates to an image forming apparatus. More specifically, the present invention relates to an apparatus for forming an image on an image carrier such as a photoreceptor dielectric by a known image forming process such as electrophotography or electrostatic recording.
この種の画像形成装置は、像担持体の表面に可転写トナ
ー像を形成した後、これを転写材に転写するもので、転
写後に像担持体表面に残留するトナーは充分に除去する
必要がある。This type of image forming apparatus forms a transferable toner image on the surface of an image carrier and then transfers it to a transfer material, and it is necessary to sufficiently remove the toner remaining on the surface of the image carrier after transfer. be.
また上記のような画像形成装置に於いては、コロナ放電
器等の装置内高圧機器によって生成されるオゾン等のコ
ロナ生成物や、紙等の転写材からｖｉ離したタルク、ロ
ジンなどの異物を除去しなければならない、このような
異物は、トナーと異なりクリーニングブレードなどによ
っては除去が困難であり、高湿環境下では吸湿して像担
持体表面の低抵抗化をもたらし、いわゆる画像流れをま
ぬがれない。In addition, in the image forming apparatus described above, corona products such as ozone generated by high-voltage equipment in the apparatus such as a corona discharger, and foreign substances such as talc and rosin separated from the transfer material such as paper are removed. Unlike toner, these foreign substances that must be removed are difficult to remove using a cleaning blade or the like, and in a high-humidity environment, they absorb moisture and lower the resistance on the surface of the image carrier, thus avoiding so-called image deletion. do not have.
そこで、クリーニング装置内にクリーニングブレードや
ファーブラシなどのトナー除去手段に加えて、シリコン
ゴムなどの弾性体ローラからなる摺擦部材で像担持体表
面を摺擦して主としてトナー以外の異物をクリーニング
する方法がすでに提案されている。Therefore, in addition to a toner removal means such as a cleaning blade or a fur brush in the cleaning device, a rubbing member made of an elastic roller such as silicone rubber is used to rub the surface of the image carrier to mainly clean foreign substances other than toner. Methods have already been proposed.
ところが、上記の弾性体ローラを常時強い圧力で像担持
体に押し当てることによって、画像流れは充分に防止す
ることはできるが、その強い圧接力により像担持体表面
の感光層等が摩耗し、また往々にして不均一に摩耗する
ため画像むらが発生するという問題があった。However, although image deletion can be sufficiently prevented by constantly pressing the elastic roller against the image carrier with strong pressure, the strong pressure causes abrasion of the photosensitive layer on the surface of the image carrier. Furthermore, there is a problem in that image unevenness occurs due to non-uniform wear.
そこで、像担持体の内部に設けたシーズヒータや面発熱
体等の加熱手段により像担持体の表面温度を所定の設定
温度に上昇させて前記の画像流れを防ぐようにしている
が、例えば高速複写機、特に自動両面複写機能を有する
複写機にあっては、定着器や、像担持体その他の駆動装
置等に多くの電力を必要とするため、上記加熱手段への
通電は主として待機時間中に行い、両面複写の場合はも
ちろん片面複写の場合でも複写時は加熱手段への通ｉｆ
ｆ量を減らす、あるいは特に両面複写の場合には加熱手
段への通電を切る場合もある。Therefore, heating means such as a sheathed heater or a surface heating element provided inside the image carrier are used to raise the surface temperature of the image carrier to a predetermined set temperature to prevent the above-mentioned image blurring. Copying machines, especially those with an automatic double-sided copying function, require a large amount of power for the fixing device, image carrier, and other driving devices, so the heating means is energized mainly during standby time. When making double-sided copies as well as single-sided copies, do not pass the heat to the heating means when copying.
In some cases, the f amount may be reduced or, especially in the case of double-sided copying, the power to the heating means may be turned off.
そのため高湿環境下で連続複写する場合、特に両面複写
する場合に、複写枚数の増加に伴って感光体の表面温度
が徐々に下がってくるため、画像流れが発生しやすくな
る問題がある。Therefore, when continuous copying is performed in a high humidity environment, especially when double-sided copying is performed, the surface temperature of the photoreceptor gradually decreases as the number of copies increases, causing the problem that image deletion is likely to occur.
本発明は、上記のように像担持体を待機時間等の適時に
設定温度に加熱する手段を備えた画像形成装置における
上記の問題点を解決することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in an image forming apparatus equipped with means for heating an image carrier to a set temperature at an appropriate time such as during standby time.
口、発明の構成
〔問題点を解決するための手段〕
本発明は、像担持体の表面温度を検知する温度検知手段
と、帯電器内の空気を強制的に換気する換気手段とを設
け、上記温度検出手段で検出された像担持体の表面温度
の下降に応じて上記換気手段の風量を増大させるように
構成したことを特徴とする。Summary: Structure of the Invention [Means for Solving Problems] The present invention includes a temperature detection means for detecting the surface temperature of an image carrier, and a ventilation means for forcibly ventilating the air inside the charger. The present invention is characterized in that the air volume of the ventilation means is increased in response to a decrease in the surface temperature of the image carrier detected by the temperature detection means.
温度検出手段で検出された像担持体の表面温度の下降に
応じて帯電器の換気手段の風量が増大し、帯電器内に滞
留するコロナ生成物（０３、ＮＯｘ等）や湿気、並びに
タルク等の異物が帯電器外に排出されて画像流れの発生
が低減される。In response to a decrease in the surface temperature of the image carrier detected by the temperature detection means, the air volume of the ventilation means of the charger increases, and corona products (03, NOx, etc.), moisture, talc, etc. that remain in the charger are removed. Foreign matter is discharged to the outside of the charger, reducing the occurrence of image deletion.
第１図は１画像形成装置としての電子写真複写機の要部
の概略構成説明図である０図において１は像担持体とし
てのドラム型感光体で、その周辺には一次帯電器２、像
露光部３、現像器４、ポスト帯電器５、転写帯電器６、
分離帯電器７、クリーニング装置８などの公知の画像形
成プロセス機器が順に配設しである。FIG. 1 is a schematic diagram illustrating the main parts of an electrophotographic copying machine as an image forming apparatus. In FIG. exposure section 3, developing device 4, post charger 5, transfer charger 6,
Known image forming process equipment such as a separation charger 7 and a cleaning device 8 are arranged in this order.
上記感光体ｌは図中矢示の方向に回転し、−成帯電器２
で一様に帯電された後、露光部３で光像が露光され静電
潜像が形成される。その静電潜像は現像器４によってト
ナー現像されて可転写の顕像となり、それが転写帯電器
６で転写材９に転写される。The photoreceptor l rotates in the direction indicated by the arrow in the figure, and the charger 2
After being uniformly charged, an optical image is exposed in the exposure section 3 to form an electrostatic latent image. The electrostatic latent image is developed with toner by a developing device 4 to become a transferable developed image, which is transferred onto a transfer material 9 by a transfer charger 6.
転写後、転写材９は分離帯電器７により感光体ｌより分
離され、図に省略した定着器を経て機外に排出される。After the transfer, the transfer material 9 is separated from the photoreceptor 1 by the separation charger 7, and is discharged to the outside of the apparatus via a fixing device (not shown).
一方、転写に寄与せず感光体１上に残留したトナーは、
感光体１の回転に伴ってクリーニング装置８にいたる。On the other hand, the toner remaining on the photoconductor 1 without contributing to the transfer is
As the photoreceptor 1 rotates, it reaches the cleaning device 8.
そのクリーニング装置はクリーニングブレード８ａと、
摺擦部材８ｂとをそなえており、残留トナーおよびそれ
以外の異物は、これらによってかき落とされて、クリー
ニング装置内に貯留され、必要に応じてスクリューコン
ベアによって外部に排出される。The cleaning device includes a cleaning blade 8a,
The cleaning device is provided with a rubbing member 8b, and residual toner and other foreign matter are scraped off by these members, stored in the cleaning device, and discharged to the outside by a screw conveyor as necessary.
以下、本発明を、両面複写機能を有する高速複写機に適
用した実施例について説明する。第２図はその複写機の
概略構成説明図で、第１図と同一部材には同一符号を付
して再度の説明を省略する。Hereinafter, an embodiment in which the present invention is applied to a high-speed copying machine having a double-sided copying function will be described. FIG. 2 is a schematic structural explanatory diagram of the copying machine, and the same members as those in FIG.
感光体ｌは、本例においては直径１０８ ａｍのアモル
ファスシリコンドラムを用いたもので、プロセススピー
ド４４０ ｍｍ／ｓｅｃで前記の作像プロセスを実行す
る０弾性ローラ８ｂは感光体ｌに接触圧１５ｇ／ｃｍで
圧接する。In this example, the photoconductor l is an amorphous silicon drum with a diameter of 108 am, and the elastic roller 8b, which executes the above-described image forming process at a process speed of 440 mm/sec, has a contact pressure of 15 g/sec on the photoconductor l. Press with cm.
また強制換気手段１０は、本例においてはポスト帯電器
５と分離帯電器７（ともにＡＣ帯電）とに設けたもので
ある。その各換気手段１ｏは、帯電線を囲むシールド部
材５ａ・７ａの感光体１と反対側に空気吸引ファンを設
けてシールド部材５ａａ７ａ内に滞留するコロナ生成物
等を空気と共に器外に排出させるようにした例を示す、
１１は上記各換気手段１０の風量を制御する制御装置、
１２は一次帯電器２とクリーニング装置８との間におい
て感光体ｌの外周面に近接させて配置した温度測定セン
サ等の温度検知手段である。Further, the forced ventilation means 10 is provided in the post charger 5 and the separation charger 7 (both AC charging) in this example. Each of the ventilation means 1o includes an air suction fan provided on the side opposite to the photoreceptor 1 of the shield members 5a and 7a surrounding the charged wires, so that corona products etc. staying in the shield members 5aa7a are discharged outside the device together with the air. Here is an example of
11 is a control device that controls the air volume of each of the ventilation means 10;
Reference numeral 12 denotes a temperature detecting means such as a temperature measuring sensor, which is disposed between the primary charger 2 and the cleaning device 8 and close to the outer peripheral surface of the photoreceptor l.
上記感光体１の内部には、シーズヒータ・面発熱体等の
感光体加熱手段（図に省略）が配設されている。その加
熱手段は待機時間中は１００Ｗの電力で感光体表面を常
時所定の設定温度（例えば４３℃）に保つように構成さ
れ、片面複写の場合は５０Ｗ、両面複写の場合はＯＷと
なるようにシーケンス制御されている。Inside the photoreceptor 1, a photoreceptor heating means (not shown) such as a sheathed heater or a surface heating element is provided. The heating means is configured to constantly maintain the surface of the photoreceptor at a predetermined set temperature (for example, 43°C) with a power of 100 W during standby time, 50 W for single-sided copying, and OW for double-sided copying. Sequence controlled.
そのため例えば、室温３２．５℃、湿度８５％の環境下
で待機時間後に両面複写を連続して行ったときの感光体
１の表面温度は第３図のグラフＡのように変化する。即
ち、複写開始前は設定温度（４３℃）に保たれているが
、複写開始と共にドラムヒータへの通電が断たれて徐々
に下降し、内部昇温とバランスして温度の下降がとまり
（３６〜３７℃）、その後内部昇温と共に徐々に上昇す
るが、設定温度よりも低い。Therefore, for example, the surface temperature of the photoreceptor 1 changes as shown in graph A in FIG. 3 when double-sided copying is continuously performed after a standby time in an environment with a room temperature of 32.5° C. and a humidity of 85%. That is, before copying starts, the set temperature (43°C) is maintained, but as soon as copying starts, electricity is cut off to the drum heater and the temperature gradually decreases, and the temperature stops decreasing in balance with the internal temperature rise (36°C). ~37°C), and then gradually rises as the internal temperature rises, but is lower than the set temperature.
上記のように感光体１の表面温度が設定温度よりも低く
なると画像流れが生じやすくなる。そこでその温度の下
降に応じてポスト帯電器５・分離帯電器７の換気手段１
０の風量を増大させるようにしたもので、その風量は感
光体表面温度に対して例えば
となるようにする、第３図Ｂはその風量の変化を示すグ
ラフである。As described above, when the surface temperature of the photoreceptor 1 becomes lower than the set temperature, image deletion tends to occur. Therefore, depending on the temperature drop, the ventilation means 1 of the post charger 5 and the separation charger 7
3B is a graph showing the change in the air volume.
なお上記の風量は、帯電器の形状及び換気手段の空気通
路の形状等によりそれらの静圧は変わりうる量であるの
で相対値で示した。即ち、感光体ｌの表面温度が４０℃
以上のときの換気手段１０の設定風量を１としたときの
各温度範囲における風量を表わす。Note that the above air volume is expressed as a relative value because the static pressure thereof can vary depending on the shape of the charger, the shape of the air passage of the ventilation means, etc. That is, the surface temperature of the photoreceptor l is 40°C.
The air volume in each temperature range is shown when the set air volume of the ventilation means 10 in the above case is set to 1.
上記の風量は、例えば吸気ファンの回転速度あるいは空
気通路の開口面積等を変えることによって変化させる。The above-mentioned air volume is changed by, for example, changing the rotational speed of the intake fan or the opening area of the air passage.
また実施例は換気手段の風量を段階的に変化させる例を
示したが、表面温度の変化に対応して連続的に変化させ
てもよい。Furthermore, although the embodiment has shown an example in which the air volume of the ventilation means is changed in stages, it may be changed continuously in response to changes in the surface temperature.
さらに前記の温度検知手段のほかに湿度検知手段を設け
、その双方の検出値に応じて強制換気手段の風量を変化
させるように構成することもある。Furthermore, in addition to the above-mentioned temperature detecting means, a humidity detecting means may be provided, and the air volume of the forced ventilation means may be changed in accordance with the detected values of both of the humidity detecting means.
なお本発明は両面複写機能を有する複写機以外の各種の
画像形成装置にも適用できる。Note that the present invention can also be applied to various image forming apparatuses other than copying machines having a double-sided copying function.
ハ１発明の効果
本発明は上記の構成であるから、特に高湿環境下で像担
持体の表面温度が下降して画像流れが生じやすくなった
場合に帯電器に設けた換気手段の風量が増大して帯電器
内に滞留するオゾン等のコロナ生成物や湿気、並びにタ
ルク等の異物が排出されるので、画像流れの発生が低減
されるものである。C1 Effects of the Invention Since the present invention has the above-mentioned configuration, the air volume of the ventilation means provided in the charger can be reduced especially when the surface temperature of the image carrier falls in a high humidity environment and image deletion tends to occur. Since corona products such as ozone, moisture, and foreign substances such as talc, which have increased and remain in the charger, are discharged, the occurrence of image deletion is reduced.
また上記のように画像流れが低減されるから。Also, as mentioned above, image deletion is reduced.
クリーニング装置内の弾性体ローラの像担持体に対する
接触圧を弱くできるので、像担持体の耐久性が向上する
効果がある。Since the contact pressure of the elastic roller in the cleaning device against the image carrier can be reduced, the durability of the image carrier can be improved.
第１図は画像形成装置の概略構成説明図、第２図は本発
明を適用した画像形成装置の同上図、第３図は像担持体
（感光体）の表面温度と換気手段の風量の変化を示すグ
ラフである。
１は像担持体（感光体）、５はポスト帯電器、７は分離
帯電器、１ｏは換気手段、１１は換気手段制御装置、１
２は温度検知手段。FIG. 1 is a schematic configuration diagram of an image forming apparatus, FIG. 2 is the same diagram as above of the image forming apparatus to which the present invention is applied, and FIG. 3 is a change in the surface temperature of the image carrier (photoreceptor) and the air volume of the ventilation means. This is a graph showing. 1 is an image carrier (photoreceptor), 5 is a post charger, 7 is a separation charger, 1o is a ventilation means, 11 is a ventilation means control device, 1
2 is a temperature detection means.
Claims (1)
た画像形成装置において、 像担持体の表面温度を検知する温度検知手段と、帯電器
内の空気を強制的に換気する換気手段とを設け、上記温
度検出手段で検出された像担持体の表面温度の下降に応
じて上記換気手段の風量を増大させるように構成したこ
とを特徴とする画像形成装置。(1) In an image forming apparatus equipped with a means for heating the image carrier to a set temperature in a timely manner, a temperature detection means for detecting the surface temperature of the image carrier, and a ventilation means for forcibly ventilating the air inside the charger. An image forming apparatus characterized in that the image forming apparatus is configured to increase the air volume of the ventilation means in accordance with a decrease in the surface temperature of the image carrier detected by the temperature detection means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15682086A JPS6313064A (en) | 1986-07-03 | 1986-07-03 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15682086A JPS6313064A (en) | 1986-07-03 | 1986-07-03 | Image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6313064A true JPS6313064A (en) | 1988-01-20 |
Family
ID=15636057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15682086A Pending JPS6313064A (en) | 1986-07-03 | 1986-07-03 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6313064A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03124097U (en) * | 1990-03-30 | 1991-12-17 |
-
1986
- 1986-07-03 JP JP15682086A patent/JPS6313064A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03124097U (en) * | 1990-03-30 | 1991-12-17 |
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