JPH0830491B2 - Charging device - Google Patents
Charging deviceInfo
- Publication number
- JPH0830491B2 JPH0830491B2 JP63303537A JP30353788A JPH0830491B2 JP H0830491 B2 JPH0830491 B2 JP H0830491B2 JP 63303537 A JP63303537 A JP 63303537A JP 30353788 A JP30353788 A JP 30353788A JP H0830491 B2 JPH0830491 B2 JP H0830491B2
- Authority
- JP
- Japan
- Prior art keywords
- bearing
- charging member
- charging
- shaft
- conductive bearing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Sliding-Contact Bearings (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、転写ローラ及び接触帯電部材等のローラー
部材の軸受けを備える帯電装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging device including a roller roller bearing such as a transfer roller and a contact charging member.
［従来の技術］ 従来の転写ローラの軸受けは第４図に示すように構成
されていた。図において、１は感光体、４は導電性軸受
け、２は転写ローラ、２−１は転写ローラの芯金、２−
２はゴム、プラスチツク等で作られた導電部材である。
又５は転写ローラを軸受けを介して感光体に押し当てる
ためのバネである。第５図は軸受けの斜視図であり、４
−１はバネ５のホルダー、４−２は芯金との摺動面であ
る。[Prior Art] A conventional transfer roller bearing has a structure as shown in FIG. In the figure, 1 is a photoconductor, 4 is a conductive bearing, 2 is a transfer roller, 2-1 is a core metal of the transfer roller, 2-
Reference numeral 2 is a conductive member made of rubber, plastic, or the like.
Reference numeral 5 is a spring for pressing the transfer roller against the photosensitive member via a bearing. FIG. 5 is a perspective view of the bearing, and 4
Reference numeral -1 is a holder of the spring 5, and 4-2 is a sliding surface with the core metal.
［発明が解決しようとしている問題点］ しかしながら従来の装置では、転写ローラ２と現像剤
（トナー）の極性が逆であるため、現像器やクリーナー
からもれたトナーは芯金２−１に非常に吸いよせられや
すく、摺動面４−２の間に現像剤（トナー）６が入りこ
んでしまった。これらのトナー６は現像器やクリーナー
にあるトナーもれ出し防止用のサイドシール部からもれ
出たものが、感光体の回転にともない上記摺動面４−２
に入りこんだものである。[Problems to be Solved by the Invention] However, in the conventional apparatus, since the transfer roller 2 and the developer (toner) have opposite polarities, the toner leaked from the developing device or the cleaner is extremely difficult to be transferred to the core metal 2-1. The developer (toner) 6 has entered between the sliding surfaces 4-2. Although these toners 6 leak out from the side seal portion of the developing device or the cleaner for preventing toner from leaking out, the sliding surface 4-2 is caused by the rotation of the photoconductor.
It is an intruder.
さらにトナー６の体積抵抗率（1010〜1015Ωcm）は、
軸受け部材のもの［商品名：ユピタール102〜105Ωcm］
より高い電気低抗体として作用するので、印加電流が流
れにくくなってしまう。そして、その結果転写不良が発
生してしまった。Further, the volume resistivity (10 10 to 10 15 Ωcm) of Toner 6 is
Bearings [Product name: Iupital 10 2 to 10 5 Ωcm]
Since it acts as a higher low-antibody antibody, it becomes difficult for the applied current to flow. As a result, a transfer failure has occurred.
［問題点を解決するための手段］ 本発明は上記に鑑み成されたもので、被帯電体に接触
して設けられ、被帯電体を帯電する帯電部材と、この帯
電部材の軸を回転可能に支持する導電性軸受けと、前記
導電性軸受けを被帯電体に向けて付勢する付勢部材と、
を有し、前記導電性軸受けを介して前記帯電部材に電圧
が印加可能であり、前記導電性軸受けよりも体積抵抗率
の大きい現像剤を用いる画像形成装置の帯電装置におい
て、前記導電性軸受けは、現像剤を受ける受け部であっ
て、前記帯電部材の軸と接触せずに対向し、前記付勢部
材の付勢方向において前記帯電部材の軸に対して被帯電
体と逆側に受け部を備えることにより、トナーの入り込
みを防止し、その結果転写不良等の帯電不良を防止する
ことを可能にするものである。[Means for Solving Problems] The present invention has been made in view of the above, and a charging member that is provided in contact with a charged body and charges the charged body, and a shaft of the charging member are rotatable. A conductive bearing that supports the conductive bearing, and a biasing member that biases the conductive bearing toward the charged body,
In the charging device of the image forming apparatus using a developer having a volume resistivity larger than that of the conductive bearing, a voltage can be applied to the charging member via the conductive bearing, and the conductive bearing is A receiving portion for receiving the developer, the receiving portion facing the shaft of the charging member without coming into contact therewith, and the receiving portion on the side opposite to the charged body with respect to the shaft of the charging member in the urging direction of the urging member. By including the above, it is possible to prevent the toner from entering, and as a result, prevent charging failure such as transfer failure.
［実施例］ 第１−１図と第１−２図は本発明の実施例を示すもの
で、先の従来例で説明してある構成や材料については重
複した説明を避ける。[Embodiment] FIGS. 1-1 and 1-2 show an embodiment of the present invention, and redundant description of the structures and materials described in the prior art will be omitted.
図において３は本発明の帯電装置の導電性軸受けであ
り、転写ローラ２の芯金２−１との摺動面に芯金２−１
と接触せずに対向し、現像剤を受ける受け部として溝３
−１が掘ってある（第１−２図参照）。この溝があるお
かげで、作動中に仮にトナーが摺動面に入り込んでも、
ここの溝３−１に掻きあつめられることになる。トナー
は付勢部材であるバネ５の付勢方向ａにおいて芯金２−
１に対して軸受け３の感光体１と逆側の部分に多くたま
りやすいのでトナー受け部としての溝３−１は、付勢方
向ａにおいて芯金２−１に対して感光体１と逆側に設け
るのが良い。In the figure, reference numeral 3 denotes a conductive bearing of the charging device of the present invention, which is provided on the sliding surface of the transfer roller 2 with the core metal 2-1.
The groove 3 as a receiving portion that faces the developer without contacting the developer and receives the developer.
-1 is dug (see Figure 1-2). Thanks to this groove, even if toner gets into the sliding surface during operation,
It will be scratched in the groove 3-1. The toner causes the core metal 2-in the biasing direction a of the spring 5 which is the biasing member
The groove 3-1 as the toner receiving portion is formed on the opposite side of the core metal 2-1 in the biasing direction a from the side opposite to the photoconductor 1 because the bearing 3 tends to accumulate in a portion of the bearing 3 opposite to the photoconductor 1. It is better to install
そして、摺動面と芯金２−１は常に接触することがで
き、転写ローラには正常にバイアスが印加することが可
能となる。その結果、長時間装置を作動しても転写不良
等の事故を発生することがなくなった。Then, the sliding surface and the core metal 2-1 can always contact each other, and the bias can be normally applied to the transfer roller. As a result, even if the apparatus is operated for a long time, an accident such as a transfer failure does not occur.
［他の実施例］ 第２図にその他の実施例を示す。[Other Embodiments] FIG. 2 shows another embodiment.
これは溝を芯金２−１に対し斜めに掘ったものであ
り、掻き取られたトナーが芯き金２−１の回転と共に軸
受けの外に排出されるものである。その結果より長期に
渡り芯金２−１と摺動面の接触を安定に保つことが可能
となった。This is a groove formed by obliquely digging into the core metal 2-1 and the scraped toner is discharged out of the bearing as the core metal 2-1 rotates. As a result, the contact between the core metal 2-1 and the sliding surface can be stably maintained for a longer period of time.
さらに第３図のような複数の溝を設けた軸受けの構成
にすれば、トナーが摺動面により入りにくいという利点
も出てくる。Further, if the bearing is provided with a plurality of grooves as shown in FIG. 3, there is an advantage that toner is hard to enter on the sliding surface.
また実施例の説明においては転写バイアスを印加する
転写ローラを用いて説明したが、その他への転用として
は本出願人からすでに提案されている帯電のためのロー
ラの軸受けにおいても、好ましくないトナーを除去し、
バイアス電圧の印加を妨げないという同様の効果がある
ことは云うまでもない。Further, in the description of the embodiments, the transfer roller for applying the transfer bias is used for the description, but as a diversion to other purposes, even in the bearing of the roller for charging which has already been proposed by the present applicant, undesired toner is generated. Removed,
It goes without saying that there is the same effect that the application of the bias voltage is not hindered.
［発明の効果］ 以上説明したように、導電性軸受けが、現像剤を受け
るために帯電部材の軸と接触せずに対向する受け部を備
えることにより、長期に渡りこの帯電部材に対して安定
した給電と円滑な回転を維持することが可能となった。EFFECTS OF THE INVENTION As described above, the conductive bearing is provided with the receiving portion that faces the shaft of the charging member so as to receive the developer and does not contact the shaft of the charging member. It has become possible to maintain stable power supply and smooth rotation.
第１−１図は本発明の実施例の側面図、第１−２図は同
実施例の軸受の斜視図、第２図と第３図はその他の実施
例を示す軸受の斜視図、第４図は従来例の側面図で第５
図はその軸受の斜視図を示す。 図において、 １は感光ドラム ２は帯電部材 ３は軸受け ５は軸受け加圧バネ を示す。FIG. 1-1 is a side view of an embodiment of the present invention, FIG. 1-2 is a perspective view of the bearing of the same embodiment, and FIGS. 2 and 3 are perspective views of bearings showing other embodiments. FIG. 4 is a side view of the conventional example and is shown in FIG.
The figure shows a perspective view of the bearing. In the figure, 1 is a photosensitive drum 2, 2 is a charging member, 3 is a bearing, and 5 is a bearing pressure spring.
Claims (1)
帯電する帯電部材と、この帯電部材の軸を回転可能に支
持する導電性軸受けと、前記導電性軸受けを被帯電体に
向けて付勢する付勢部材と、を有し、前記導電性軸受け
を介して前記帯電部材に電圧が印加可能であり、前記導
電性軸受けよりも体積抵抗率の大きい現像剤を用いる画
像形成装置の帯電装置において、 前記導電性軸受けは、現像剤を受ける受け部であって、
前記帯電部材の軸と接触せずに対向し、前記付勢部材の
付勢方向において前記帯電部材の軸に対して被帯電体と
逆側に受け部を備えることを特徴とする帯電装置。1. A charging member which is provided in contact with an object to be charged and charges the object to be charged, a conductive bearing which rotatably supports a shaft of the charging member, and the conductive bearing as a member to be charged. An image forming apparatus using a developer having a volume resistivity higher than that of the conductive bearing, wherein a voltage can be applied to the charging member via the conductive bearing. In the charging device, the conductive bearing is a receiving portion for receiving a developer,
A charging device, which is opposed to the shaft of the charging member without contacting the shaft, and includes a receiving portion on the opposite side of the shaft of the charging member from the body to be charged in the urging direction of the urging member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63303537A JPH0830491B2 (en) | 1988-11-29 | 1988-11-29 | Charging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63303537A JPH0830491B2 (en) | 1988-11-29 | 1988-11-29 | Charging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02150505A JPH02150505A (en) | 1990-06-08 |
| JPH0830491B2 true JPH0830491B2 (en) | 1996-03-27 |
Family
ID=17922187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63303537A Expired - Lifetime JPH0830491B2 (en) | 1988-11-29 | 1988-11-29 | Charging device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0830491B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6428700B2 (en) * | 2016-04-05 | 2018-11-28 | 京セラドキュメントソリューションズ株式会社 | Rotation detection mechanism, fixing device including the same, and image forming apparatus |
-
1988
- 1988-11-29 JP JP63303537A patent/JPH0830491B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02150505A (en) | 1990-06-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3030868B2 (en) | Charging device | |
| JP2586511B2 (en) | Developing device | |
| JPH103213A (en) | Rotating member sealing system and developer unit | |
| JPS61129664A (en) | Developing device | |
| JPS6022350B2 (en) | developing device | |
| JPH0830491B2 (en) | Charging device | |
| JPH1115263A (en) | Developing device | |
| JPS59195253A (en) | Electrophotographic apparatus | |
| JP3256598B2 (en) | Developing device | |
| JPH0410635B2 (en) | ||
| TW328568B (en) | Image forming machine | |
| JPS5863961A (en) | Developing device of electronic copying machine | |
| JP3272126B2 (en) | One-component developing device | |
| JPH0667554A (en) | Transfer device | |
| JP2855593B2 (en) | Developing device | |
| JP3076508B2 (en) | Developing device | |
| JPH08254894A (en) | Developing device | |
| JPS623949B2 (en) | ||
| JPH08314278A (en) | Developing device | |
| JPH0753095Y2 (en) | Fur brush cleaning device for electrophotographic device | |
| JPS63214781A (en) | Image forming device | |
| JP3293950B2 (en) | Transfer belt device | |
| JPS5926025B2 (en) | electrostatic recording device | |
| JP2869269B2 (en) | Copy machine transfer device | |
| JPH11258928A (en) | Electrophotographic device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080327 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090327 Year of fee payment: 13 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090327 Year of fee payment: 13 |