JPS62138874A - Developing device - Google Patents

Developing device

Info

Publication number
JPS62138874A
JPS62138874A JP60279897A JP27989785A JPS62138874A JP S62138874 A JPS62138874 A JP S62138874A JP 60279897 A JP60279897 A JP 60279897A JP 27989785 A JP27989785 A JP 27989785A JP S62138874 A JPS62138874 A JP S62138874A
Authority
JP
Japan
Prior art keywords
toner
carrier
latent image
developing roller
roller
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.)
Granted
Application number
JP60279897A
Other languages
Japanese (ja)
Other versions
JPH0772813B2 (en
Inventor
Hiroyuki Matsushiro
松代 博之
Setsu Tanzawa
節 丹沢
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP60279897A priority Critical patent/JPH0772813B2/en
Publication of JPS62138874A publication Critical patent/JPS62138874A/en
Publication of JPH0772813B2 publication Critical patent/JPH0772813B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Dry Development In Electrophotography (AREA)

Abstract

PURPOSE:To compensate difference in or deformation of the configuration of a toner carrier or latent image carrier and to secure proper development nip width by pressing a support member which supports a toner carrier against a latent image carrier and also pressing the toner carrier itself against the latent image carrier by a pressure member. CONSTITUTION:At least either of a developing roller 5 and a photosensitive body 7 is so constituted preferably that the surface part deforms elastically in order to obtain proper nip width W. The developing roller 5 consists of a roller shaft 5a made of conductive metal, etc., and an elastic material layer 5b outside it which is made of rubber, etc.; and it is considered that the surface part of the developing roller 5 has elasticity and the photosensitive body 7 has an rigid surface. Further, the developing roller (toner carrier) 5 is supported rotatably on the side wall of a toner container 1, and a hook part 1d projected from the support member (toner container) 1 is engaged with a support pin 8 fixed to the machine frame of an image forming device, so that the whole unit type developing device is supported so that it swing as shown by an arrow A.

Description

【発明の詳細な説明】 狭羽芳互 本発明は、薄層イヒされたI〜ルナ−担持する)−ナー
担持体を、その1〜ナ一薄層を介して:替像担持体に圧
接させ、潜像担持体の静、Tt潜僅を可1lIll争1
ヒする131像装置に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for press-contacting a thin-layered I~lunar carrier to a replacement image carrier through the thin layer. The static and Tt latency of the latent image carrier can be controlled 1lIlll 1
131 image device.

災象皮主 電子複写機、プリンタ、ファクシミリ等の作徴装誼に採
用される上記形式の現像装置は従来より周知である。こ
の形式の現像装置においては1ヘナ一担持体と潜像担持
体をトナー薄WJを介して互いに圧接させて所定の現1
象ニップ幅を維持する必要がある。現像ニップ幅とは潜
像担持体の移動方向ないしは回転方向における1ヘナ一
担持体と潜像担持体の接触幅であり、このニップ幅が小
さすぎると現像された可視像の濃度が薄くなり、逆に大
きすぎても潜像担持体に付着したトナーがトナー担持体
[;よって擦り取られ、可視像に濃度むらができる恐れ
がある。このため従来は、トナー担持体と潜像担持体の
組(=1ないしはその位置調整時に、これらを相対的に
動かしながら両者を圧接させ、所定の現像ニップ幅が得
られたところで両者の相対位置を固定していた。ところ
がこの方法では適正なニップ幅が得られるようにトナー
担持体と潜像担持体を組付ける作業が容易でないだけで
なく。
The above-mentioned type of developing device used in electronic copying machines, printers, facsimile machines, etc. is well known. In this type of developing device, a henna carrier and a latent image carrier are brought into pressure contact with each other via a thin toner WJ to produce a predetermined image.
Elephant nip width must be maintained. The developing nip width is the contact width between the henna 1 carrier and the latent image carrier in the direction of movement or rotation of the latent image carrier, and if this nip width is too small, the density of the developed visible image will be low. On the other hand, if it is too large, the toner adhering to the latent image carrier may be rubbed off by the toner carrier, resulting in density unevenness in the visible image. For this reason, in the past, when adjusting the position of a pair of toner carrier and latent image carrier (=1), they were brought into pressure contact while moving them relatively, and when a predetermined developing nip width was obtained, the relative position of the two was adjusted. However, with this method, it is not only difficult to assemble the toner carrier and the latent image carrier to obtain an appropriate nip width.

トナー担持体あるいはef&担持体の表面にわずかな凹
凸があったり、製作上の誤差等によってこれらの形MA
が理想的な形かられずかにずれているだけで、両者の均
一な当たりが阻害され、適正な現像ニップ幅が得られな
くなる恐れがある。そこでトナー担持体を支持する支持
部材(通常はトナーを収容する!−ナー容器)自体をば
ね等の押圧手段によって潜像担持体に向けて押圧し、1
−ナー担持体を潜像担持体に弾性的に押圧させる構成が
提案されている。ところがこの構成によってもI〜ルナ
−持体や潜像担持体表面のわずかな凹凸や偏心等によっ
て、両者の均一な圧接が阻害され、現像ニップ幅が不均
一となったり、この幅が周期的に変動したりし、rfl
fiJlされた可視像に濃度むらや白抜は現象が発生す
る恐れを免かれなかった。
Due to slight irregularities on the surface of the toner carrier or ef & carrier, manufacturing errors, etc., these shapes MA
Even a slight deviation from the ideal shape may impede uniform contact between the two, and there is a risk that an appropriate developing nip width may not be obtained. Therefore, the support member that supports the toner carrier (usually a toner container containing toner) is pressed against the latent image carrier by a pressing means such as a spring.
- A structure has been proposed in which the toner carrier is elastically pressed against the latent image carrier. However, even with this configuration, slight irregularities or eccentricity on the surface of the I~lunar carrier or the latent image carrier prevent uniform pressure contact between the two, resulting in uneven development nip width or periodic The rfl
There was a risk that density unevenness and white spots would occur in the fiJl visible image.

旦煎 本発明の目的は簡単な構成によって上記従来の欠点を除
去できる冒頭に記載した形式の現イΩζ′!装置を提供
することである。
It is an object of the present invention to solve the problem of the conventional method described at the beginning, which eliminates the above-mentioned drawbacks of the conventional technology through a simple construction. The purpose is to provide equipment.

え腹 本発明は上記目的を達成するため、トナー担持体を支持
した支持部材を潜像担持体に対して押圧すると共に、ト
ナー担持体自体を加圧部材によって潜像担持体に対して
押圧する構成を提案する。
In order to achieve the above object, the present invention presses a support member supporting a toner carrier against the latent image carrier, and also presses the toner carrier itself against the latent image carrier by a pressing member. Suggest a configuration.

以下1本発明の実施例を図面に従って説明し。An embodiment of the present invention will be described below with reference to the drawings.

併せて上述した従来の欠点を図面に即して明らかにする
In addition, the above-mentioned drawbacks of the conventional technology will be clarified with reference to the drawings.

第1図は本発明に係る現像装置の一例を示し、そのトナ
ー容器1内にトナー(−成分系現像剤)2が収容されて
いる。トナー2はトナー粒子のみ、あるいはこれに補助
成分を含有した粉状体であり、磁性トナーであっても非
磁性トナーであってもよい。トナー容器1内のトナー2
は回転駆動されるアジテータ3によって1−ナー補給ロ
ーラ4に近づけられ、該ローラ4の回転によって搬送さ
れながら、反時計方向に回転駆動される現像ローラ5と
して構成されたトナー担持体に向けて送られろ。
FIG. 1 shows an example of a developing device according to the present invention, in which a toner container 1 contains toner (-component developer) 2. As shown in FIG. The toner 2 is a powder containing only toner particles or auxiliary components, and may be a magnetic toner or a non-magnetic toner. Toner 2 in toner container 1
is brought close to the 1-toner replenishing roller 4 by an agitator 3 that is rotationally driven, and is conveyed by the rotation of the roller 4 toward a toner carrier configured as a developing roller 5 that is rotationally driven in a counterclockwise direction. Let it go.

図に一例として示した補給ローラ4は、その外側層4a
が発泡体、あるいはスポンジ等の弾性体、たとえばプリ
ジストンポリウレタンフォーム(商品名;エバーライト
TS)から成る。
The replenishment roller 4 shown as an example in the figure has an outer layer 4a.
is made of foam or an elastic body such as sponge, for example, Pridistone polyurethane foam (trade name: Everlite TS).

Efl、像ローラ5に送られたトナーはJ兄像ローラ5
の表面に接触して摩擦帯電され、現像ローラ5に圧接さ
れたブレード状のトナ一層厚規制部材6によって薄層化
される。このときトナーは規制部材6と現像ローラ5と
の間で摩擦作用を受け、さらに強く摩擦帯電される。規
制部材6を通った1〜す−は薄い層をなしてrflaロ
ーラ5に担持されつつ搬送され、この!−ナ一層2aは
たとえば時計方向に回転するドラム状の感光体7から成
る潜(象担持体と現像ローラ5との間の現像領域に運ば
れ、該[−ナーが感光体7に形成された静電潜像に静電
的に移行し、潜像が可視像化される。感光体7に移行せ
ずに現像領域を通過した!・ナーは再びトナー容器1の
側に搬送される。
Efl, the toner sent to the image roller 5 is sent to the J brother image roller 5.
The toner is triboelectrically charged by contacting the surface of the toner, and is made into a thin layer by a blade-shaped toner thickness regulating member 6 pressed against the developing roller 5 . At this time, the toner is subjected to a frictional action between the regulating member 6 and the developing roller 5, and is even more strongly frictionally charged. 1 to 2 that have passed through the regulating member 6 are conveyed in a thin layer while being supported by the rfla roller 5, and this! The -ner layer 2a is transported to a developing region between a drum-shaped photoreceptor 7 rotating clockwise and a developing roller 5, and the -ner is formed on the photoreceptor 7. The latent image is electrostatically transferred to the electrostatic latent image, and the latent image is made into a visible image.The toner that has passed through the development area without transferring to the photoreceptor 7 is transported to the toner container 1 side again.

現像動作は上述の如く行われるが、そのVAaaローラ
5と感光体7はトナーの薄層を介して互いに圧接し、両
者はその回転方向ないしは周方向に成る幅をもって接触
している。この幅が現(象ニップ幅Wであり、この幅は
大きすぎても小さすぎても感光体7に形成される可視(
争の画質が低下する。
The developing operation is performed as described above, and the VAaa roller 5 and the photoreceptor 7 are pressed against each other with a thin layer of toner interposed therebetween, and the two are in contact with each other with a width extending in the rotation direction or circumferential direction. This width is the actual nip width W, and whether this width is too large or too small, the visible (visible) formed on the photoreceptor 7
The image quality of the image will deteriorate.

適正な現像ニップ幅が得られるようにするには。How to obtain the appropriate developing nip width.

11Jl像ローラ5と感光体7の少なくとも一方の少な
くとも表面部分が弾性的に変形できるように構成されて
いることが望ましい。そこで本例では現像ローラ5がi
g電電性金環から成るローラ軸5dと、その外側のゴム
等から成る弾性体層5bとから構成さ九、現像ローラ5
の表面部分が弾性を有しているものとし、感光体7の方
はその表面も剛体から成るものとする。また現像ローラ
([・ナー担持体)5は第2図および第3図に示すよう
にトナー容器lの側壁1a、’lbに回転自在に支持さ
れ、この支持部材(本例ではトナー容器1)はこれに突
設されたフック部1dが作像装置の機枠に固定された支
持ピン8に掛合しており、これによりユニット状の現像
装置の全体が矢印へ方向に揺動可能に支持される。また
容器1の背面ICと作像装置機枠等の固定部9との間に
は圧縮コイルばね10゜11から成る押圧手段が配設さ
れ、これによってトナー容器1ないしは現像装置の全体
が感光体7に向けて押圧されている。この場合、従来提
案されている構成においてはこの押圧手段でトナー容器
を感光体71\向けてイ」勢することによって、押圧手
段の力だけで現像ローラ5を感光体7に弾性的に圧接さ
せ、所定の現像ニップ幅を得るようにしていた。感光体
7と現像ローラ5がその幅に対して理想的な形態、この
例では理想的な円柱形に形成されていれば、従来の提案
に係る構成だけで現像ローラ5と感光体7をその長手方
向に亘って均一な圧力で圧接させることができ、ばね1
0゜11のばね力を適宜調整することにより常に適正な
現像ニップ幅を維持し、均一1度の可視像を得ることが
可能である。ところが実際には現像ローラ5や感光体7
にはその製作時の誤差等によってその形態が理想的な形
からずれているのが怜通である。第4図(a)乃至(c
)および第5図は現像ローラ5の形態のずれ状態を例示
するものであり、第4図(a)に示す現像ローラ5は、
その右端部がローラ軸5a(正確にはその軸線X)に対
して偏心しており、最大径aと最小径すの差a −bだ
け右側部がフしている。第4図(b)の例では現像ロー
ラ5の両端部がa−bフしている。第4図(c)ではロ
ーラ5の左右の端部が逆方向にa−bだけフしている。
It is desirable that at least a surface portion of at least one of the image roller 5 and the photoreceptor 7 is configured to be elastically deformable. Therefore, in this example, the developing roller 5 is
g A developing roller 5 consisting of a roller shaft 5d made of an electrically conductive metal ring and an elastic layer 5b made of rubber or the like on the outside thereof.
It is assumed that the surface portion of the photoreceptor 7 has elasticity, and the surface of the photoreceptor 7 is also made of a rigid body. Further, as shown in FIGS. 2 and 3, the developing roller (toner carrier) 5 is rotatably supported by the side walls 1a, 'lb of the toner container l, and this supporting member (in this example, the toner container 1) A hook portion 1d protruding from this is engaged with a support pin 8 fixed to the frame of the image forming device, whereby the entire unit-shaped developing device is supported so as to be swingable in the direction of the arrow. Ru. Further, a pressing means consisting of compression coil springs 10° and 11 is disposed between the rear IC of the container 1 and a fixed part 9 such as the frame of the image forming device. It is being pushed towards 7. In this case, in the conventionally proposed configuration, the toner container is biased toward the photoreceptor 71 by the pressing means, so that the developing roller 5 is elastically pressed against the photoreceptor 7 only by the force of the pressing means. , to obtain a predetermined developing nip width. If the photoreceptor 7 and the developing roller 5 are formed in an ideal shape for their width, in this example an ideal cylindrical shape, the developing roller 5 and the photoreceptor 7 can be formed in that shape using only the configuration according to the conventional proposal. Spring 1 can be pressed with uniform pressure in the longitudinal direction.
By appropriately adjusting the spring force of 0°11, it is possible to always maintain an appropriate developing nip width and obtain a uniform 1° visible image. However, in reality, the developing roller 5 and the photoreceptor 7
It is said that the form deviates from the ideal form due to errors during the manufacturing process. Figures 4(a) to (c)
) and FIG. 5 illustrate the misaligned state of the developing roller 5, and the developing roller 5 shown in FIG. 4(a) is
The right end portion thereof is eccentric with respect to the roller shaft 5a (more precisely, its axis X), and the right side portion is offset by the difference a−b between the maximum diameter a and the minimum diameter. In the example shown in FIG. 4(b), both ends of the developing roller 5 are aligned a-b. In FIG. 4(c), the left and right ends of the roller 5 are bent in opposite directions by a distance ab.

第5図に示す例では、!51.像ローラ5の形態自体が
一点鎖線で示す理想的な円柱状形態から最大Cだけずれ
ており、これは円筒度のむらと呼ばれている。円筒度の
むらば、ローラの軸線の位置は問題とせず、専ら理想的
なローラ形態からのずれを問題としたときの現像ローラ
の変形状態である。そのほか、現像ローラの表面に凹凸
があるため、その長手方向全体に亘ってローラ径が一定
しないこともあり、これは真直度のむらと呼ばれている
。このように現像ローラ5 (または感光体)の形態に
ずれがあると、ばね10゜11によってトナー容器を付
勢し、現像ローラを感光体に圧接させても、現像ローラ
(または感光体)の半径方向に突出した部分が互いに強
く当たるため、両者が均一な圧力で当接できず、またそ
の圧接状態が現数ローラの回転に伴って変動し、これに
伴って現像ニップ幅も現像ローラ長手方向に亘って不均
一となったり、周期的に変化したりする。このため現像
された可視像の濃度が不均一となり、白抜は現象が発生
する恐れを免れない。
In the example shown in Figure 5,! 51. The form of the image roller 5 itself deviates from the ideal cylindrical form shown by the dashed line by a maximum of C, and this is called uneven cylindricity. If the cylindricity is uneven, the position of the axis of the roller does not matter, but only the deviation from the ideal roller shape is the problem, and the deformation state of the developing roller is considered. In addition, since the surface of the developing roller has irregularities, the diameter of the roller may not be constant over the entire longitudinal direction, and this is called unevenness in straightness. If there is a misalignment in the form of the developing roller 5 (or the photoreceptor), even if the toner container is urged by the springs 10 and 11 and the developing roller is brought into pressure contact with the photoreceptor, the developing roller (or the photoreceptor) Because the protruding parts in the radial direction strongly contact each other, they cannot contact with uniform pressure, and the state of pressure changes as the developing roller rotates. It becomes non-uniform over the direction or changes periodically. For this reason, the density of the developed visible image becomes non-uniform, and there is a risk that white spots may occur.

そこで本発明に係る現像装置においては、現像ローラ5
自体が感光体7に向けて押圧されるように構成され1図
示した例では現像ローラ5の片側の端部が押圧されてい
る。すなわち、第2図お上び第3図から明らかなように
、ローラ軸5aの各端部には必要に応じてベアリング2
0.20aが取付けられ、この部分がトナー容器1に穿
設された孔21.21aに嵌合しているが、一方の孔2
1は第2図における水平方向に長くなった長孔に形成さ
れ、ここに嵌合したローラ軸部分が水平方向にわずかに
移動できるように支持さ扛ている。また第2図に示すよ
うにトナー容器lが一方の側壁1aにはピン22を介し
て加圧アーム23が回転可能に支持され、該アーム23
の一方の端部と容器側壁1aとには引張(工ね24から
成る加圧部材の各端部が係止され、これによりアーム2
3は第2図における時計方向に回動習性を与えられ、そ
の他方の端部がベアリング20を介してローラ軸5aの
端部に圧接し、現像ローラ5を感光体7に向けて押圧し
ている。この構成により現像ローラ5はばねto、1t
による加圧力F、、F2によって固定部9の側から感光
体7に対して押し付けられるだけでなく、トナー容器1
からもばね24によりF3で示すように感光体7に対し
て加圧される。このため、ばね10.I L、24のば
ね力を適当に選択すれば、回転する現像ローラ5や感光
体7がその理想的な形態から多少変形していても。
Therefore, in the developing device according to the present invention, the developing roller 5
The developing roller 5 is configured to be pressed against the photoreceptor 7, and in the example shown in FIG. 1, one end of the developing roller 5 is pressed. That is, as is clear from FIGS. 2 and 3, bearings 2 are provided at each end of the roller shaft 5a as necessary.
0.20a is attached, and this part fits into the hole 21.21a bored in the toner container 1.
1 is formed as a horizontally elongated hole in FIG. 2, and a roller shaft portion fitted therein is supported so as to be able to move slightly in the horizontal direction. Further, as shown in FIG. 2, a pressure arm 23 is rotatably supported on one side wall 1a of the toner container l via a pin 22.
Each end of a pressure member consisting of a tension member 24 is engaged with one end of the arm 2 and the side wall 1a of the container.
3 is given a rotational habit in the clockwise direction in FIG. There is. With this configuration, the developing roller 5 has springs to and 1t.
The toner container 1 is not only pressed against the photoreceptor 7 from the fixing part 9 side by the pressing force F, , F2 caused by the
The photoreceptor 7 is pressurized by the spring 24 as shown by F3. For this reason, spring 10. If the spring force of IL, 24 is appropriately selected, the rotating developing roller 5 and photoreceptor 7 may be slightly deformed from their ideal forms.

ばね24による加圧力によって現像ローラ5は感光体7
に追従して常にその長手方向全体に亘ってほぼ均一な圧
力で接することができる。よって現像ニップ幅Wを常に
適正値に維持し、その変動を抑制することができる。こ
れにより可視像の濃度むらや白抜けの発生を阻止ないし
は抑制することができる。
The developing roller 5 is pressed against the photoreceptor 7 by the pressure applied by the spring 24.
It is possible to follow this and always make contact with a substantially uniform pressure over the entire length direction. Therefore, the developing nip width W can always be maintained at an appropriate value and its fluctuation can be suppressed. This makes it possible to prevent or suppress the occurrence of density unevenness and white spots in visible images.

図示した実施例のように2以上のばね10,11を用い
、これit呪現像−ラ5の両端部に対応する位置に設け
ておくと、現像ローラ5と感光体7の均一圧接を簡単に
実現できる。またトナー容器1に長孔21が形成され、
ここにローラ軸5aの端部が移動可能に嵌合しているた
め、第2図から判る通り長孔21による隙間ができるが
、それ自体公知のように現像ローラ5の両側にはスポン
ジ等から成るシール部材25.25aが設けられている
ので、このシール部材25が第3図に示すように長孔2
1の隙間を塞ぎ、容器1内のトナーが外部へ流出する不
都合を阻止することができる。ローラ軸5aの端部が長
孔21を移動できるストローク、すなわち第2図の水平
方向における長孔21の隙間は、現像ローラ5と感光体
7の形態のずれ量の総和より大きく設定し、現像ローラ
5をこのずれに対して追従させ、感光体7との均一圧接
を保証する必要があるが、このずれ量の総和は実際には
極く小さな値であり、したがって長孔21の隙間も小さ
く設定でき、よって通常のシート部材25によってこの
隙間を充分に塞ぐことができる。
If two or more springs 10, 11 are used as in the illustrated embodiment and provided at positions corresponding to both ends of the developing roller 5, uniform pressure contact between the developing roller 5 and the photoreceptor 7 can be easily achieved. realizable. Further, a long hole 21 is formed in the toner container 1,
Since the end of the roller shaft 5a is movably fitted here, a gap is created by the elongated hole 21 as can be seen from FIG. Since the sealing member 25.25a is provided, this sealing member 25 is provided with the elongated hole 2 as shown in FIG.
1 can be closed, thereby preventing the inconvenience of the toner inside the container 1 flowing out. The stroke by which the end of the roller shaft 5a can move through the elongated hole 21, that is, the gap between the elongated holes 21 in the horizontal direction in FIG. It is necessary to make the roller 5 follow this deviation to ensure uniform pressure contact with the photoreceptor 7, but the total amount of this deviation is actually an extremely small value, and therefore the gap between the long holes 21 is also small. Therefore, this gap can be sufficiently closed by the ordinary sheet member 25.

上記実施例では現像ローラ5の一方の端部側だけをばね
24によって加圧したが、その理由は以下の通りである
In the above embodiment, only one end of the developing roller 5 is pressed by the spring 24, and the reason is as follows.

ばね24の位置する側と反対側のローラ軸端部には歯車
26が固着され、これに他の歯車(図示せず)が噛み合
っていて、これらによって現像ローラ5が第1図および
第2図における反時計方向に回転駆動される。この歯車
26が駆動されるとき。
A gear 26 is fixed to the end of the roller shaft opposite to the side where the spring 24 is located, and another gear (not shown) meshes with this gear, and these gears cause the developing roller 5 to move as shown in FIGS. 1 and 2. is rotated counterclockwise at . When this gear 26 is driven.

わずかではあるが、その駆動トルクが変動するのが普通
である。したがってもしもこの駆動側のローラ軸端部が
嵌合する孔21aを孔21と同様に長孔とし、このロー
ラ軸端を可動とすると共にこれをばねで加圧したとする
と、駆動トルクの変動に伴い、このローラ軸端部が感光
体7に対して接する圧力が変動し、現像ローラ5と感光
体7の均一圧接が阻害される恐れがある。そこで図示し
た例では、孔21aを長孔とせず、ここに嵌合したロー
ラ軸端部がトナー容器1に対して移動しないようにして
現像ローラ5と感光体7の圧接力の変動を防止し、圧力
変動の影響を受けない側、すなわち駆動側と反対側の現
像ローラ端部側をばわ24によって加圧している。歯車
以外の伝動部材、たとえばプーリ等を用いたときも同様
である。
It is normal for the driving torque to fluctuate, albeit slightly. Therefore, if the hole 21a into which the drive-side roller shaft end fits is made into a long hole like the hole 21, and if this roller shaft end is made movable and pressurized with a spring, then the fluctuation of the drive torque will be Accordingly, the pressure with which this roller shaft end comes into contact with the photoreceptor 7 fluctuates, and there is a possibility that uniform pressure contact between the developing roller 5 and the photoreceptor 7 may be inhibited. Therefore, in the illustrated example, the hole 21a is not made into a long hole, and the end of the roller shaft fitted therein is prevented from moving relative to the toner container 1, thereby preventing fluctuations in the pressure contact force between the developing roller 5 and the photoreceptor 7. The side that is not affected by pressure fluctuations, that is, the end side of the developing roller opposite to the driving side is pressurized by a rib 24. The same applies when a transmission member other than a gear, such as a pulley, is used.

勿論、場合によっては駆動側の@像ローラ端部を加圧部
材によって加圧することもできるし、駆動側と非駆動側
を共に加圧部材によって加圧してもよい。
Of course, depending on the case, the end of the image roller on the drive side may be pressed by a pressure member, or both the drive side and the non-drive side may be pressed by a pressure member.

実験では、ゴム硬度46°の弾性体層5bを有し、片側
フレ50μ(第4図(a)参照)1円筒度のむら10μ
(第5図参照)の現像ローラと片側フレ50μ、円筒度
のむらlOμの感光体を用いて現像動作を行った。ばね
24のない従来の現像装置の場合には、押圧手段(ばね
to、11)の加圧力を2kgに設定したとき、現像さ
れた可視像の長手方向50mnに亘って白抜けが発生し
た。
In the experiment, the elastic layer 5b had a rubber hardness of 46°, and one side deflection was 50μ (see Figure 4(a)), and the unevenness of cylindricity was 10μ.
A developing operation was performed using a developing roller (see FIG. 5) and a photoreceptor with a one-sided deflection of 50 μm and a cylindricity unevenness of 10 μm. In the case of the conventional developing device without the spring 24, when the pressing force of the pressing means (spring 11) was set to 2 kg, white spots occurred over 50 mm in the longitudinal direction of the developed visible image.

ばね24を有する図示した現像装置を用い、ばね10.
11の相加圧力を1.5kg、ばね24の加圧力を30
0gに設定したとき、自抜けのない高品質な可視像が得
られた。またこの実験において。
Using the illustrated developer having spring 24, spring 10.
The applied force of spring 24 is 1.5 kg, and the applied force of spring 24 is 30 kg.
When set to 0g, a high quality visible image without any omissions was obtained. Also in this experiment.

ばね24を設けた側のローラ軸端部の移動可能なストロ
ーク、すなわち長孔21の隙間は、!i5光体。
The movable stroke of the end of the roller shaft on the side where the spring 24 is provided, that is, the gap between the elongated holes 21 is! i5 light body.

現像ローラの形態のずれ量のほぼ総和に相当する0、1
mmに設定すればよく、この程度の隙間ではトナーのシ
ール性に何ら影響を与えないことも判った。
0, 1, which corresponds to approximately the total amount of deviation in the form of the developing roller.
It is sufficient to set the gap to mm, and it has been found that a gap of this size does not affect the sealing performance of the toner at all.

図示した実施例ではトナー担持体の一例として現像ロー
ラを挙げたが、この担持体がベル1−がら成るときも本
発明を適用でき、また潜像担持体がローラに掛けられた
ベルトから成るとき、あるいは潜像担持体の少なくとも
表面部分が弾性変形可能であり、または潜像担持体が誘
電体ドラム、あるいは誘電体ベルトから成るときも同様
に適用できる。
In the illustrated embodiment, a developing roller is used as an example of the toner carrier, but the present invention can also be applied when this carrier consists of a bell 1-, and when the latent image carrier consists of a belt hung around a roller. Alternatively, the present invention can be similarly applied when at least the surface portion of the latent image carrier is elastically deformable, or when the latent image carrier is composed of a dielectric drum or a dielectric belt.

トナー担持体の支持部材(実施例の1−ナー容器)を加
圧する加圧手段としては、コイルばねに限らず、たとえ
ば板ばね、ガスばね等の適宜な弾性手段を用いてもよく
、その数および配設位にも適宜選択できる、トナー担持
体を加圧する加圧部材も全く同様に、引張ばね24以外
の適宜な手段を探用できる。現像装置の全体を回動可能
に支持する代りに、これを潜像担持体に向けて平行移動
可能に支持してもよい。
The pressurizing means for pressurizing the support member of the toner carrier (1-toner container in the embodiment) is not limited to a coil spring, but may be any suitable elastic means such as a leaf spring or a gas spring. Similarly, as for the pressure member for pressurizing the toner carrier, which can be appropriately selected in its arrangement position, any suitable means other than the tension spring 24 can be used. Instead of supporting the entire developing device so that it can rotate, it may be supported so that it can move in parallel toward the latent image carrier.

紘釆 本発明によれば簡単な構成によって、トナー担持体ない
しは潜像担持体に形態のずれないしは変形があっても、
これを補償して適正な現像ニップ幅を確保でき、高品質
な可視像を得ることが可能となった。
According to the present invention, due to the simple structure, even if the toner carrier or the latent image carrier has a shape shift or deformation,
By compensating for this, an appropriate developing nip width can be ensured, making it possible to obtain a high-quality visible image.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明に係る現像装置の一例を示す断面図、第
2図はこのfl装置の側面図、第3図は第2図のm −
to線断面図であって、一部の要素を省略して示した図
、第4図(a)、(b)、(c)はrfl像ローラの形
態のフレ状態を説明する説明図。 第5図はTfl像ローラの円筒度のむらな説明する説明
図である。 1・・・トナー容器 第1図 第2図 第4図
FIG. 1 is a sectional view showing an example of a developing device according to the present invention, FIG. 2 is a side view of this fl device, and FIG. 3 is a m-
FIGS. 4A, 4B, and 4C are explanatory diagrams illustrating the deflection state of the RFL image roller; FIG. FIG. 5 is an explanatory diagram illustrating unevenness in cylindricity of the Tfl image roller. 1... Toner container Figure 1 Figure 2 Figure 4

Claims (5)

【特許請求の範囲】[Claims] (1)薄層化されたトナーを担持するトナー担持体を、
そのトナー薄層を介して潜像担持体に圧接させ、潜像担
持体の静電潜像を可視像化する現像装置において、 トナー担持体を支持した支持部材を潜像担持体に対して
押圧すると共に、トナー担持体自体を加圧部材によって
潜像担持体に対して押圧することを特徴とする前記現像
装置。
(1) A toner carrier carrying a thin layer of toner,
In a developing device that makes the electrostatic latent image on the latent image carrier visible by bringing it into pressure contact with the latent image carrier through the toner thin layer, a support member that supports the toner carrier is placed against the latent image carrier. The developing device is characterized in that the toner carrier itself is pressed against the latent image carrier by a pressing member.
(2)前記支持部材が、トナーを収容するトナー容器で
ある特許請求の範囲第1項に記載の現像装置。
(2) The developing device according to claim 1, wherein the support member is a toner container containing toner.
(3)トナー担持体と潜像担持体の少なくとも一方の少
なくとも表面部分が弾性を有する特許請求の範囲第1項
または第2項に記載の現像装置。
(3) The developing device according to claim 1 or 2, wherein at least a surface portion of at least one of the toner carrier and the latent image carrier is elastic.
(4)トナー担持体の少なくとも一方の端部を前記加圧
部材によって押圧する特許請求の範囲第1項乃至第3項
のうちいずれか1つに記載の現像装置。
(4) The developing device according to any one of claims 1 to 3, wherein at least one end of the toner carrier is pressed by the pressure member.
(5)トナー担持体にその片側端から駆動力を加えて該
担持体を回転駆動すると共に、前記加圧部材によりトナ
ー担持体の駆動側と反対側の端部を加圧する特許請求の
範囲第1項乃至第4項のうちいずれか1つに記載の現像
装置。
(5) A driving force is applied to the toner carrier from one end thereof to rotationally drive the carrier, and the pressure member presses the end of the toner carrier opposite to the drive side. The developing device according to any one of Items 1 to 4.
JP60279897A 1985-12-12 1985-12-12 Development device Expired - Lifetime JPH0772813B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60279897A JPH0772813B2 (en) 1985-12-12 1985-12-12 Development device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60279897A JPH0772813B2 (en) 1985-12-12 1985-12-12 Development device

Publications (2)

Publication Number Publication Date
JPS62138874A true JPS62138874A (en) 1987-06-22
JPH0772813B2 JPH0772813B2 (en) 1995-08-02

Family

ID=17617446

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60279897A Expired - Lifetime JPH0772813B2 (en) 1985-12-12 1985-12-12 Development device

Country Status (1)

Country Link
JP (1) JPH0772813B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5076201A (en) * 1989-03-16 1991-12-31 Fujitsu Limited Developing device used in electrophotographic field and method of producing developing roller incorporated therein
JP2001034143A (en) * 1999-05-20 2001-02-09 Canon Inc Process cartridge and electrophotographic image forming device
US6608984B1 (en) * 1999-04-23 2003-08-19 Ricoh Company, Ltd. Image forming method and apparatus using developer carrier pressed into engagement with image carrier
WO2005101133A1 (en) * 2004-04-16 2005-10-27 Sharp Kabushiki Kaisha Image forming device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6247069A (en) * 1985-08-27 1987-02-28 Fuji Xerox Co Ltd Developing machine for electrophotographic copying machine
JPS62103674A (en) * 1985-10-31 1987-05-14 Fuji Xerox Co Ltd Developing device for electronic copying machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6247069A (en) * 1985-08-27 1987-02-28 Fuji Xerox Co Ltd Developing machine for electrophotographic copying machine
JPS62103674A (en) * 1985-10-31 1987-05-14 Fuji Xerox Co Ltd Developing device for electronic copying machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5076201A (en) * 1989-03-16 1991-12-31 Fujitsu Limited Developing device used in electrophotographic field and method of producing developing roller incorporated therein
US6608984B1 (en) * 1999-04-23 2003-08-19 Ricoh Company, Ltd. Image forming method and apparatus using developer carrier pressed into engagement with image carrier
JP2001034143A (en) * 1999-05-20 2001-02-09 Canon Inc Process cartridge and electrophotographic image forming device
WO2005101133A1 (en) * 2004-04-16 2005-10-27 Sharp Kabushiki Kaisha Image forming device
US7809310B2 (en) 2004-04-16 2010-10-05 Sharp Kabushiki Kaisha Image forming apparatus

Also Published As

Publication number Publication date
JPH0772813B2 (en) 1995-08-02

Similar Documents

Publication Publication Date Title
US4835565A (en) Image developing device for electrophotography
US4989037A (en) Device for driving a rotary body
JPS62138874A (en) Developing device
US4613229A (en) Cleaning apparatus
JP2000122445A (en) Transfer roller pressurizing device
JPS63202773A (en) Spacing control member
JP2005222055A (en) Separated developing device
JPH09311552A (en) Image forming device
JP3837176B2 (en) Development device
US5080037A (en) Developing device
JPH0755561Y2 (en) Development device
JPH05150671A (en) Image forming device
JPH0375767A (en) Developing device for electrophotographic device
JP3212888B2 (en) Image forming device
JP2002229349A (en) Image forming device
JP4058634B2 (en) Development device
JPH0442255A (en) Developing device
JPH04116577A (en) One-component developing device
JPH08297389A (en) Driving device
JPH0542442Y2 (en)
JPH1097145A (en) Turning part supporting device for image forming device
JPH04267278A (en) Developing device
JP2890541B2 (en) Developing device
JPH08682Y2 (en) Image forming device developing device
JPH04213474A (en) Electrifier