JP2671792B2 - Electrophotographic printer - Google Patents
Electrophotographic printerInfo
- Publication number
- JP2671792B2 JP2671792B2 JP5336294A JP33629493A JP2671792B2 JP 2671792 B2 JP2671792 B2 JP 2671792B2 JP 5336294 A JP5336294 A JP 5336294A JP 33629493 A JP33629493 A JP 33629493A JP 2671792 B2 JP2671792 B2 JP 2671792B2
- Authority
- JP
- Japan
- Prior art keywords
- charging
- drum
- damper
- frequency
- electrophotographic printer
- 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 - Fee Related
Links
Landscapes
- Accessory Devices And Overall Control Thereof (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は電子写真プリンタに関
し、特に接触帯電式のドラム部の構造に特徴のある電子
写真プリンタに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic printer, and more particularly to an electrophotographic printer having a contact charging type drum structure.
【０００２】[0002]
【従来の技術】従来電子写真プリンタの主な帯電方式と
しては、接触帯電方式とコロナ帯電方式がある。接触帯
電方式はコロナ帯電方式と比較して、印加電圧を低く抑
えられ、オゾン発生が少ない点が優れている為に、最近
は接触帯電方式が広く用いられている。2. Description of the Related Art Conventionally, there are a contact charging method and a corona charging method as a main charging method of an electrophotographic printer. Compared with the corona charging method, the contact charging method is excellent in that the applied voltage can be kept low and the amount of ozone generated is small. Therefore, the contact charging method has been widely used recently.
【０００３】この接触帯電方式の場合、印加電圧を直流
にすると帯電ムラが生じ易い為、交流成分を加えた振動
電圧を印加している。In the case of this contact charging system, when the applied voltage is DC, charging unevenness is likely to occur, so an oscillating voltage added with an AC component is applied.
【０００４】上記接触帯電方式について、図面を参照し
て説明する。The contact charging method will be described with reference to the drawings.
【０００５】図５に示すように、ブラシホルダ３に固
着，支持された帯電ブラシ２がドラム１に当設されてお
り、ドラム１の図中矢印方向の回転に伴い、帯電ブラシ
２はドラム１表面と擦り合わされる。As shown in FIG. 5, a charging brush 2 fixed and supported by a brush holder 3 is provided on the drum 1, and the charging brush 2 is rotated by the drum 1 as the drum 1 rotates in the direction of the arrow in the figure. Rubbed against the surface.
【０００６】このとき、帯電ブラシ２にはブラシホルダ
３と結線された電源４から振動電圧が印加され、ドラム
１への帯電が行われる。その振動電圧の波形は図２に示
すように、直流成分ＶDCに周波数ｆ，電圧の交流成分Ｖ
ACが加わったものである。At this time, an oscillating voltage is applied to the charging brush 2 from a power source 4 connected to the brush holder 3 to charge the drum 1. Its waveform of the oscillating voltage as shown in FIG. 2, the DC component V DC to the frequency f, the AC component of the voltage V
AC is added.
【０００７】続いて帯電動作時に発生する引力について
説明する。Next, the attractive force generated during the charging operation will be described.
【０００８】帯電ブラシ２とドラム１の表面に生じる電
荷は常に異符号であるため、静電力は引力となり帯電ブ
ラシ２とドラム１は互いに引き合うが、帯電電圧は交流
成分を有する為に、この引力には強弱が生じる。この引
力の時間変化を近似式で表すと、 Ｆ＝Ａｓｉｎ（ωｔ＋φ1 ）＋Ｂｓｉｎ（２ωｔ＋φ2 ）＋Ｃ （但し、Ａ，Ｂ，Ｃ，φ1 ，φ2 は定数；ω＝２πｆ） となる。Since the charges generated on the surfaces of the charging brush 2 and the drum 1 are always of different signs, the electrostatic force acts as an attractive force and the charging brush 2 and the drum 1 attract each other, but since the charging voltage has an AC component, this attractive force is generated. There are strengths and weaknesses. If the time change of this attractive force is expressed by an approximate expression, F = Asin (ωt + φ 1 ) + Bsin (2ωt + φ 2 ) + C (where A, B, C, φ 1 and φ 2 are constants; ω = 2πf).
【０００９】即ち、引力は帯電電圧の周波数（以降帯電
周波数と表す）及びその２倍の周波数を有する周期的な
力である。ドラム１とブラシホルダ３を図６のように単
純支持梁でモデル化すると、帯電ブラシ２とドラム１間
の引力は分布荷重として与えられている。That is, the attractive force is a periodic force having a frequency of the charging voltage (hereinafter referred to as a charging frequency) and twice the frequency thereof. When the drum 1 and the brush holder 3 are modeled by a simple support beam as shown in FIG. 6, the attractive force between the charging brush 2 and the drum 1 is given as a distributed load.
【００１０】ドラム１の等価質量をｍ1 ，等価バネ定数
をｋ1 ，変位をｘ1 とすると、バネ質量系の運動方程式
は、Assuming that the equivalent mass of the drum 1 is m 1 , the equivalent spring constant is k 1 , and the displacement is x 1 , the equation of motion of the spring-mass system is
【００１１】[0011]
【数１】 (Equation 1)
【００１２】と表される。ここでＦは帯電による静電力
である。定常振動解（特解）のみを考えると、この方程
式の解は、## EQU1 ## Here, F is an electrostatic force due to charging. Considering only the steady vibration solution (special solution), the solution of this equation is
【００１３】[0013]
【数２】 (Equation 2)
【００１４】で与えられる。即ちドラム１は周波数ｆで
は振幅Ａ／（ｋ1 −ｍ1 ω2 ）の振動を、周波数２ｆで
は振幅Ｂ（ｋ1 −４ｍ1 ω2 ）の振動を生じていること
がわかる。このドラムの振動が周辺の空気に伝幡される
ので、主な周波数成分がｆ及び２ｆの騒音が生じる。Is given by That is, it can be seen that the drum 1 causes vibration of amplitude A / (k 1 −m 1 ω 2 ) at frequency f and vibration of amplitude B (k 1 −4m 1 ω 2 ) at frequency 2f. Since the vibration of the drum is transmitted to the surrounding air, noises of which main frequency components are f and 2f are generated.
【００１５】尚、接触帯電手段としてブラシを例にとり
説明したが、帯電ローラを使用した場合も同様である。Although the brush has been described as an example of the contact charging means, the same applies when a charging roller is used.
【００１６】[0016]
【発明が解決しようとする課題】しかしながら、上記従
来の接触帯電方式では、帯電時、帯電ブラシとドラム表
面とが擦り合うために、騒音が発生するという問題点が
あった。However, the above-mentioned conventional contact charging method has a problem that noise is generated because the charging brush and the drum surface rub against each other during charging.
【００１７】この騒音は放射音と振動音に大別され、放
射音は、ブラシを使用する帯電方式の場合では、ブラシ
が微小な振動を生じドラム表面を叩く際に発生する音、
つまり帯電ローラの微小な変形が空気を振動させて発生
する音である。一方振動音は、上述したドラムとブラシ
ホルダに作用する加振力によりこれらの部材が振動し、
更にプリンタの機構部全体に伝幡した振動が生じる音で
ある。This noise is roughly classified into a radiated sound and a vibrating sound. In the case of the charging system using a brush, the radiated sound is a sound generated when a brush vibrates minutely and strikes the drum surface,
That is, a slight deformation of the charging roller is a sound generated by vibrating the air. On the other hand, as for the vibration sound, these members vibrate due to the exciting force acting on the drum and the brush holder described above,
Furthermore, it is a sound that causes vibrations transmitted to the entire mechanical section of the printer.
【００１８】前者放射音への対策として、帯電ローラ表
面に突起を設け、帯電ローラと感光体ドラムとの密着性
を悪くして、空気が突起回りを比較的楽に通過できるよ
うにして、放射音を防止する装置が既に提案されている
（例えば特開平２−１９８４６７号）。As a measure against the former radiated sound, a projection is provided on the surface of the charging roller, and the adhesion between the charging roller and the photosensitive drum is deteriorated so that air can pass around the projection relatively easily. A device for preventing this has already been proposed (for example, JP-A-2-198467).
【００１９】ところが振動音に対しては、振動の大きい
部材への制振材貼付等の対策が既に行われているが、効
果的な貼付箇所の検討が困難であり、制振材のコスト、
貼付工程のコストが大きいという問題点があった。However, with respect to the vibration noise, measures such as attaching a damping material to a member that vibrates significantly have already been taken, but it is difficult to examine an effective location of the damping material.
There is a problem that the cost of the attaching process is high.
【００２０】それ故、本発明は、このような問題点を解
決するもので、帯電時に発生する静電力によるドラムの
振動を抑制し、騒音を低減することができる電子写真プ
リンタを提供することを目的とする。Therefore, the present invention solves the above problems and provides an electrophotographic printer capable of suppressing the vibration of the drum due to the electrostatic force generated at the time of charging and reducing the noise. To aim.
【００２１】[0021]
【課題を解決するための手段】本発明の電子写真プリン
タは上記目的を達成するために、交流成分を持つ振動電
圧を印加した帯電ブラシを形状が中空の管状を成してい
るドラムに当接させて帯電を行う電子写真プリンタにお
いて、ドラムの内側中央部に接合されたダンパベース
と、このダンパベースに嵌合された梁状部材とを具備
し、固有振動数が前記振動電圧の周波数である梁状部材
と、固有振動数が前記振動電圧の２倍の周波数である梁
状部材とを、前記ダンパベースの両端面に設けている。 In order to achieve the above object, the electrophotographic printer of the present invention abuts a charging brush to which an oscillating voltage having an AC component is applied to a drum having a hollow tubular shape. In an electrophotographic printer that charges by charging, a damper base joined to the inner center of the drum and a beam-shaped member fitted to the damper base are provided, and the natural frequency is the frequency of the vibration voltage. Beam member
And a beam whose natural frequency is twice the frequency of the oscillating voltage
And a strip-shaped member are provided on both end surfaces of the damper base.
【００２２】[0022]
【００２３】[0023]
【実施例】次に本発明について図面を参照して説明す
る。図１は本発明の一実施例を示す電子写真プリンタの
断面図、図２は図１の帯電ブラシに印加する印加電圧の
波形を示す図、図３は図１のダイナミックダンパの断面
図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. 1 is a sectional view of an electrophotographic printer showing an embodiment of the present invention, FIG. 2 is a diagram showing a waveform of an applied voltage applied to the charging brush of FIG. 1, and FIG. 3 is a sectional view of the dynamic damper of FIG. .
【００２４】本発明は図１において、ドラム１は、中空
の管状をなしており、内部にダンパベース５が嵌合され
ている。ダンパベースの両端面に片持梁状のダイテミッ
クダンパ６及びダイナミックダンパ７が接合されてい
る。In the present invention, as shown in FIG. 1, a drum 1 has a hollow tubular shape, and a damper base 5 is fitted therein. A cantilever-shaped dynamic damper 6 and a dynamic damper 7 are joined to both end surfaces of the damper base.
【００２５】ブラシホルダ３に固着，支持された帯電ブ
ラシ２がドラム１に当接されており、ドラム１の図中矢
印方向の回転に伴って回転して、ドラム１表面と擦り合
わされる。この帯電ブラシ２は繊維材料で生成されてい
る。The charging brush 2 fixed and supported by the brush holder 3 is in contact with the drum 1, and rotates with the rotation of the drum 1 in the direction of the arrow in the figure, and rubs against the surface of the drum 1. The charging brush 2 is made of a fiber material.
【００２６】この時帯電ブラシ２には、導電性材料で生
成されたブラシホルダ３と結線された電源４から振動電
圧が印加されドラム１への帯電が行われる。その振動電
圧の波形は図２に示すように、直流成分ＶDCに周波数
ｆ，電圧の交流成分ＶACが加わったものである。At this time, an oscillating voltage is applied to the charging brush 2 from the power source 4 connected to the brush holder 3 made of a conductive material, and the drum 1 is charged. As shown in FIG. 2, the waveform of the oscillating voltage is obtained by adding the frequency f and the AC component V AC of the voltage to the DC component V DC .
【００２７】ここで図３を用いて、上記ダイナミックダ
ンパ６の形状を詳細に説明する。The shape of the dynamic damper 6 will be described in detail with reference to FIG.
【００２８】先端に断面形状が一定の真直梁をなすダン
パ６ａを有し、ダンパ６ａの根部には、つば状のフリン
ジ６ｂを有し、ダンパベース５に接合する為のスクリュ
ウ６ｃを終端部に有している。A damper 6a having a straight beam with a constant cross-section is formed at the tip, and a collar-shaped fringe 6b is provided at the root of the damper 6a. A screw 6c for joining to the damper base 5 is provided at the end. Have
【００２９】ここでダイナミックダンパ６のダンパ６ａ
のヤング率をＥ，密度をρ，断面積をＡ，断面２次モー
メントをＩ，長さをｌとする。更に、ダイナミックダン
パ７も全く同様の形状をなしており、その断面積は
Ａ′，断面２次モーメントはＩ′，長さはｌ′となって
いるものとする。Here, the damper 6a of the dynamic damper 6
Is E, the density is ρ, the cross-sectional area is A, the second moment of area is I, and the length is 1. Further, the dynamic damper 7 also has exactly the same shape, and its cross-sectional area is A ', its second moment of area is I', and its length is l '.
【００３０】続いて帯電動作時に発生する力について説
明する。Next, the force generated during the charging operation will be described.
【００３１】帯電ブラシ２とドラム１の表面に発生する
電荷は常に異符号である為、静電力は引力となり、帯電
ブラシ２とドラム１は互いに引き合う。ところが、帯電
電圧は交流成分を有する為に、この引力には強弱が生じ
る。この引力の時間変化を近似式で表すと Ｆ＝Ａｓｉｎ（ωｔ＋φ1 ）＋Ｂｓｉｎ（２ωｔ＋φ2 ）＋Ｃ （但し、Ａ，Ｂ，Ｃ，φ1 ，φ2 は定数；ω＝２πｆ） となる。Since the charges generated on the surfaces of the charging brush 2 and the drum 1 are always of different signs, the electrostatic force is an attractive force, and the charging brush 2 and the drum 1 attract each other. However, since the charging voltage has an AC component, the attractive force has different strengths. The time change of this attractive force is expressed by an approximate expression as follows: F = Asin (ωt + φ 1 ) + Bsin (2ωt + φ 2 ) + C (where A, B, C, φ 1 and φ 2 are constants; ω = 2πf).
【００３２】すなわち、帯電周波数及びその２倍の周波
数を有する周期的な引力であり、この引力はブラシホル
ダ３及びドラム１に作用する。That is, it is a periodic attractive force having a charging frequency and a frequency twice the charging frequency, and this attractive force acts on the brush holder 3 and the drum 1.
【００３３】さて、ドラム１に作用した力はダンパベー
ス５を介してダイナミックダンパ６及びダイナミックダ
ンパ７に伝達される。このダイナミックダンパ６の固有
振動数をｆ6 ，ダイナミック７の固有振動数をｆ7 とす
ると、ｆ6 及びｆ7 はThe force acting on the drum 1 is transmitted to the dynamic damper 6 and the dynamic damper 7 via the damper base 5. When the natural frequency of the dynamic damper 6 is f 6 and the natural frequency of the dynamic 7 is f 7 , f 6 and f 7 are
【００３４】[0034]
【数３】 (Equation 3)
【００３５】となる。## EQU1 ##
【００３６】ここで、本発明ではｆ6 及びｆ7 が帯電周
波数ｆと、 ｆ6 ＝ｆ ｆ7 ＝２ｆ の２つの式のような関係にあるように、ダンパ６ａとダ
ンパ７ａの形状が決定されているものとする。この様に
した場合、いわゆるダイナミックダンパの理論により、
ドラム１の振動が抑えられることになる。Here, in the present invention, the shapes of the damper 6a and the damper 7a are determined so that f 6 and f 7 have a relationship like the two equations of f 6 = f f 7 = 2f with the charging frequency f. It has been done. In this case, by the theory of so-called dynamic damper,
The vibration of the drum 1 will be suppressed.
【００３７】このことを式を用いて更に詳しく説明する
と、ドラム１の等価質量をｍ1 ，等価バネ定数をｋ1 ，
変位をｘ1 ，ダンパ６ａの等価質量をｍ2 ，等価バネ定
数をｋ2 ，変位をｘ2 ，ダンパ７ａの等価質量をｍ3 ，
等価バネ定数をｋ3 ，変位をｘ3 とすると、バネ質量系
の運動方程式は、This will be described in more detail using the equations. The equivalent mass of the drum 1 is m 1 , the equivalent spring constant is k 1 ,
The displacement is x 1 , the equivalent mass of the damper 6a is m 2 , the equivalent spring constant is k 2 , the displacement is x 2 , the equivalent mass of the damper 7a is m 3 ,
When the equivalent spring constant is k 3 and the displacement is x 3 , the equation of motion of the spring-mass system is
【００３８】[0038]
【数４】 (Equation 4)
【００３９】で表される。ここで、Ｆは帯電による静電
力である。定常振動解（特解）のみを考えると、この方
程式の解は、Is represented by Here, F is an electrostatic force due to charging. Considering only the steady vibration solution (special solution), the solution of this equation is
【００４０】[0040]
【数５】 (Equation 5)
【００４１】で与えられる。ダンパ６ａ及び７ａの固有
振動数が静電力の周波数ｆ及びその２倍の周波数２ｆに
一致していることに注意すると、Is given by Note that the natural frequencies of the dampers 6a and 7a coincide with the frequency f of the electrostatic force and the frequency 2f which is twice that,
【００４２】[0042]
【数６】 (Equation 6)
【００４３】であるから、これらを上述の方式式の解に
代入すると、Therefore, by substituting these into the solution of the above equation,
【００４４】[0044]
【数７】 (Equation 7)
【００４５】となる。即ち、ドラム１の変位ｘ1 は振動
成分を持たず静止しており、可振力のエネルギーはすべ
てダンパ６ａ及びダンパ７ａの振動エネルギーに変換さ
れる。よって、ドラム１に振動が生じないことから、周
囲の空気中へ振動が伝幡することもなく、騒音は低減さ
れる。It becomes That is, the displacement x 1 of the drum 1 is stationary with no vibration component, and all the energy of the vibrating force is converted into the vibration energy of the damper 6a and the damper 7a. Therefore, since the drum 1 is not vibrated, the vibration is not transmitted to the surrounding air and the noise is reduced.
【００４６】尚、ダイナミックダンパは一対である必要
なく、騒音のより支配的な周波数成分つまりより大きい
騒音を発生している周波数成分に対応する一方のみ設け
ても構わない。この場合、上述の運動方程式を２変数の
場合に置き換えれば同様の効果となることは自明であ
る。The dynamic damper does not have to be a pair, and only one corresponding to the more dominant frequency component of noise, that is, the frequency component generating a larger noise may be provided. In this case, it is obvious that the same effect can be obtained by replacing the above equation of motion with the case of two variables.
【００４７】次に本発明の他の実施例を示す電子写真プ
リンタのダイナミックダンパを図４を用いて説明する。Next, a dynamic damper of an electrophotographic printer showing another embodiment of the present invention will be described with reference to FIG.
【００４８】このダイナミックダンパ８は板金をＬ字状
に曲げ加工したもので、一辺をダンパ８ａ，他辺をフリ
ンジ８ｂとする。フリンジ８ｂに穴を設け、ネジ８ｃに
よりダンパベースに接合させるよう構成されている。The dynamic damper 8 is formed by bending a sheet metal into an L shape, and has one side as a damper 8a and the other side as a fringe 8b. A hole is provided in the fringe 8b, and the fringe 8b is configured to be joined to the damper base by the screw 8c.
【００４９】[0049]
【発明の効果】以上説明したように、本発明は、振動電
圧を印加した帯電ブラシをドラムに当接させて帯電を行
う電子写真プリンタにおいて、振動電圧の周波数あるい
はその２倍の周波数に一致する固有振動数を有する梁状
部材をドラム内部に設けたので、帯電時に生じる静電力
によるドラムの振動が抑制され、騒音を低減させること
ができる。よって、制振材貼付等の振動低減対策が不要
となり、プリンタの製造が容易となり、価格を低減させ
ることができる。As described above, according to the present invention, in the electrophotographic printer for charging by charging the charging brush to which the oscillating voltage is applied to the drum, the frequency of the oscillating voltage or twice the frequency thereof is matched. Since the beam-shaped member having a natural frequency is provided inside the drum, the vibration of the drum due to the electrostatic force generated at the time of charging is suppressed, and the noise can be reduced. Therefore, it is not necessary to take vibration reduction measures such as attaching a damping material, the printer can be easily manufactured, and the price can be reduced.
【図１】本発明の一実施例を示す電子写真プリンタの断
面図である。FIG. 1 is a sectional view of an electrophotographic printer showing an embodiment of the present invention.
【図２】図１の帯電ブラシに印加する印加電圧の波形を
示す図である。FIG. 2 is a diagram showing a waveform of an applied voltage applied to the charging brush of FIG.
【図３】図１のダイナミックダンパの断面図である。FIG. 3 is a cross-sectional view of the dynamic damper of FIG.
【図４】本発明の他の実施例を示す電子写真プリンタの
ダイナミックダンパの断面図である。FIG. 4 is a sectional view of a dynamic damper of an electrophotographic printer showing another embodiment of the present invention.
【図５】従来の電子写真プリンタの断面図である。FIG. 5 is a sectional view of a conventional electrophotographic printer.
【図６】従来の振動系のモデル図である。FIG. 6 is a model diagram of a conventional vibration system.
１ ドラム ２ 帯電ブラシ ３ ブラシホルダ ４ 電源 ５ ダンパベース ６，７ ダイナミックダンパ 1 Drum 2 Charging brush 3 Brush holder 4 Power supply 5 Damper base 6,7 Dynamic damper
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平５−34936（ＪＰ，Ａ) 特開 平３−140989（ＪＰ，Ａ) 特開 平４−120582（ＪＰ，Ａ) 特開 平７−319328（ＪＰ，Ａ) 特開 平５−197321（ＪＰ，Ａ) 特開 平３−45981（ＪＰ，Ａ) 特開 平４−56885（ＪＰ，Ａ) 実開 平５−69768（ＪＰ，Ｕ) 実開 昭62−127567（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-5-34936 (JP, A) JP-A-3-140989 (JP, A) JP-A-4-120582 (JP, A) JP-A-7- 319328 (JP, A) JP 5-197321 (JP, A) JP 3-45981 (JP, A) JP 4-56885 (JP, A) Actually open 5-69768 (JP, U) 62-127567 (JP, U)
Claims (2)
ラシを形状が中空の管状を成しているドラムに当接させ
て帯電を行う電子写真プリンタにおいて、 前記ドラムの内側中央部に接合されたダンパベースと、
このダンパベースに嵌合された梁状部材とを具備し、 固有振動数が前記振動電圧の周波数である梁状部材と、
固有振動数が前記振動電圧の２倍の周波数である梁状部
材とを、前記ダンパベースの両端面に設けた ことを特徴
とする電子写真プリンタ。1. An electrophotographic printer for charging by charging a charging brush, to which an oscillating voltage having an AC component is applied, to a drum having a hollow tubular shape, which is joined to the inner center of the drum. With a damper base,
Comprising a beam member which is fitted to the damper base, and the beam member is the frequency of the natural frequency of the oscillating voltage,
Beam-like portion whose natural frequency is twice the frequency of the oscillating voltage
An electrophotographic printer, characterized in that materials are provided on both end surfaces of the damper base .
ラシを形状が中空の管状を成しているドラムに当接させ
て帯電を行う電子写真プリンタにおいて、 前記ドラムの内側中央部に接合されたダンパベースと、
このダンパベースに嵌合された梁状部材とを具備し、 前記梁状部材は、その形状がＬ字状を成すと共に前記ド
ラムの振動を吸収するダンパと、このダンパの一部に穴
を設け、この穴にネジを挿入して前記ダンパベースに接
合させる ことを特徴とする電子写真プリンタ。2. A charging block to which an oscillating voltage having an AC component is applied.
Place the brush against the drum, which has a hollow tubular shape.
In an electrophotographic printer that charges by charging, a damper base joined to the inner center of the drum,
A beam-shaped member fitted to the damper base, wherein the beam-shaped member has an L-shape and
A damper that absorbs the vibration of the ram and a hole in a part of this damper
And insert a screw into this hole to connect it to the damper base.
Electrophotographic printer, characterized in that engaged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5336294A JP2671792B2 (en) | 1993-12-28 | 1993-12-28 | Electrophotographic printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5336294A JP2671792B2 (en) | 1993-12-28 | 1993-12-28 | Electrophotographic printer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07199731A JPH07199731A (en) | 1995-08-04 |
| JP2671792B2 true JP2671792B2 (en) | 1997-10-29 |
Family
ID=18297621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5336294A Expired - Fee Related JP2671792B2 (en) | 1993-12-28 | 1993-12-28 | Electrophotographic printer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2671792B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7949275B2 (en) | 2007-04-12 | 2011-05-24 | Ricoh, Ltd. | Cleaning device, process cartridge and image forming apparatus |
| US7962086B2 (en) | 2007-09-05 | 2011-06-14 | Ricoh Company Ltd. | Cleaning device, process cartridge, and image forming apparatus |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2595897B2 (en) * | 1994-05-30 | 1997-04-02 | 日本電気株式会社 | Photoconductive drum anti-vibration device |
| JP6167927B2 (en) * | 2014-02-12 | 2017-07-26 | マツダ株式会社 | Engine piston structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03140989A (en) * | 1989-10-27 | 1991-06-14 | Toshiba Corp | Image forming device |
| JPH0534936A (en) * | 1991-07-31 | 1993-02-12 | Canon Inc | Production of electrophotographic sensitive body |
-
1993
- 1993-12-28 JP JP5336294A patent/JP2671792B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7949275B2 (en) | 2007-04-12 | 2011-05-24 | Ricoh, Ltd. | Cleaning device, process cartridge and image forming apparatus |
| US7962086B2 (en) | 2007-09-05 | 2011-06-14 | Ricoh Company Ltd. | Cleaning device, process cartridge, and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07199731A (en) | 1995-08-04 |
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