JPS59145507A - Magnet-roll for dry development - Google Patents
Magnet-roll for dry developmentInfo
- Publication number
- JPS59145507A JPS59145507A JP2018183A JP2018183A JPS59145507A JP S59145507 A JPS59145507 A JP S59145507A JP 2018183 A JP2018183 A JP 2018183A JP 2018183 A JP2018183 A JP 2018183A JP S59145507 A JPS59145507 A JP S59145507A
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- magnet
- pole
- roll
- magnetic
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0231—Magnetic circuits with PM for power or force generation
- H01F7/0252—PM holding devices
- H01F7/0268—Magnetic cylinders
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は磁気ブラシ現像装置において磁気ブラシ形成手
段として使用される乾式現像用マグネットロールに関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dry developing magnet roll used as a magnetic brush forming means in a magnetic brush developing device.
磁気ブラシ現像装置においては、磁性現像剤として1例
えば、鉄粉、ツーライト粉末等の強磁性キャリアとバイ
ンダー樹脂中に着色剤等を含有させてなるトナー粉末の
混合物である二成分系現像剤あるいは一成分系の磁性ト
ナーなどが使用されている。磁性現像剤は1円筒状の非
磁性スリーブと、その内部の複数個の磁極を有する永久
磁石を軸に固定してなる永久磁石部材を有するマグネッ
トロール上に吸着され、非磁性スリーブと永久磁石部材
の相対的回転によって現像領域に搬送される。少なくと
も現像領域において、磁性現像剤は磁気ブラシを形成し
、該磁気ブラシで画像担体面を摺擦してその表面に形成
された静電荷潜像が顕像化される。In a magnetic brush developing device, the magnetic developer is a two-component developer, which is a mixture of a ferromagnetic carrier such as iron powder or two-light powder, and a toner powder containing a colorant or the like in a binder resin. Component-based magnetic toners are used. The magnetic developer is attracted onto a magnet roll having a permanent magnet member consisting of a cylindrical non-magnetic sleeve and a permanent magnet having a plurality of magnetic poles fixed to the shaft, and the non-magnetic sleeve and the permanent magnet member is conveyed to the development area by the relative rotation of. At least in the development area, the magnetic developer forms a magnetic brush, and the magnetic brush rubs the surface of the image carrier to visualize the electrostatic latent image formed on the surface.
上記のマグネットロールとしては種々の構造のものが知
られている。As the above-mentioned magnet roll, those having various structures are known.
まずハードツーライト粉末を磁場中成形後接続して得ら
れる異方性ブロック磁石を軸の周囲に固定した形成した
永久磁石部材を用いたもの(例えば実公昭57−979
8号公報参照)−が知られているが1組立工数が犬とな
る。低温減磁が生ずるなどの問題がある。First, a permanent magnet member made by fixing an anisotropic block magnet obtained by molding hard turite powder in a magnetic field and then connecting it around a shaft (for example,
(Refer to Publication No. 8) is known, but one assembly man-hour is a lot. There are problems such as low-temperature demagnetization.
次にハードフェライトからなる円筒状永久磁石を軸に固
定して永久磁石部材を用いたマクネットロール(例えば
特公昭55−6907号公報参照)も知られている。こ
のマグネットロールは、第1図に示すように、円筒状の
ツーライト磁石1aをその内径よりやや小さな外径を有
する軸2に接着剤(図示せず)等により固定した後外周
面を所定の寸法に研削加工しついで外周面に着磁を施し
て永久磁。Next, there is also known a Macnet roll (see, for example, Japanese Patent Publication No. 55-6907), which uses a permanent magnet member in which a cylindrical permanent magnet made of hard ferrite is fixed to a shaft. As shown in Fig. 1, this magnet roll is made by fixing a cylindrical two-light magnet 1a to a shaft 2 having an outer diameter slightly smaller than its inner diameter with an adhesive (not shown) or the like, and then adjusting the outer peripheral surface to a predetermined dimension. After grinding, the outer circumferential surface is magnetized to become a permanent magnet.
面部材3を形成し、永久磁石部材3を図示しない円筒状
の非磁性スリーブの内部に保持せしめて構成していた。A surface member 3 was formed, and the permanent magnet member 3 was held inside a cylindrical nonmagnetic sleeve (not shown).
しかして二成分現像剤を用いた磁気ブラシ現像システム
では、一般に永久磁石部材をその1磁極が画像担体表面
に対向する如く固定し非磁性スリーブのみを回転させて
いる。そのため現像後の現像剤の掻落しや均一な攪拌混
合を行なう必要があることから、ツーライト磁石1aは
第1図に示す如く非対称(図では6極)に着磁されて(
・る。In a magnetic brush development system using a two-component developer, a permanent magnet member is generally fixed so that one magnetic pole faces the surface of the image carrier, and only the nonmagnetic sleeve is rotated. Therefore, it is necessary to scrape off the developer after development and uniformly stir and mix it, so the two-light magnet 1a is magnetized asymmetrically (6 poles in the figure) as shown in FIG.
・Ru.
第1図において、破線は磁石内部の磁束線の流れを表し
ている。従って1円筒状のツーライト磁石1αの半分は
未着磁のまま使用されないので磁石材料が無駄になり、
又重量も犬となるという問題があった。In FIG. 1, broken lines represent the flow of magnetic flux lines inside the magnet. Therefore, half of the cylindrical two-light magnet 1α remains unmagnetized and is not used, resulting in wasted magnet material.
There was also the problem of weight.
そこで第2図に示すように1円筒状のものを切断するか
もしくは半円筒状に成形後焼結して得られた半円筒状の
ツーライト磁石1bを軸2に固定して永久磁石部材を形
成することも考えられる。しかるにこの永久磁石部材に
よれば、磁石外周面゛に第1図と同様の6極の着磁を行
うと、磁石内部の磁束線の流れが図中破線で示すように
なって、N極の両側のS極はツーライト磁石1hの外周
面の平担面ろおよび6間の角度よりも内側の角度範囲内
に配置される。従って第1図と同一仕様の着磁を行なっ
ても、磁束密度の分布状態か異なり、磁束が小回りとな
って有効な磁気ブラシを形成できなくなる。Therefore, as shown in Fig. 2, a semi-cylindrical two-light magnet 1b obtained by cutting a cylinder or molding it into a semi-cylindrical shape and sintering it is fixed to the shaft 2 to form a permanent magnet member. It is also possible to do so. However, according to this permanent magnet member, when the outer circumferential surface of the magnet is magnetized with six poles similar to that shown in Fig. 1, the flow of magnetic flux lines inside the magnet becomes as shown by the broken line in the figure, and the N pole The S poles on both sides are arranged within an angular range inside the angle between the flat surface groove and 6 on the outer peripheral surface of the two-light magnet 1h. Therefore, even if magnetization is performed according to the same specifications as in FIG. 1, the distribution of magnetic flux density will be different, and the magnetic flux will have a small radius, making it impossible to form an effective magnetic brush.
これに対し第1図と同様の磁束密度分布を得るために、
第6図に示す如く、磁石部分を拡大した断面路C“形状
のフェライト磁石1Cを使用することも考えられるが、
磁石材料の使用量および磁石型閉、の点で第2図のもの
より不利である。On the other hand, in order to obtain the same magnetic flux density distribution as in Fig. 1,
As shown in FIG. 6, it is conceivable to use a ferrite magnet 1C with a cross-sectional path C" shape in which the magnet part is enlarged.
This is disadvantageous compared to the one shown in FIG. 2 in terms of the amount of magnet material used and the closure of the magnet mold.
本発明の目的は、上述の従来技術の問題を解消し、有効
な磁極配置と軽量化が達成できる乾式現像用マグネット
ロールを提供することである。An object of the present invention is to solve the problems of the prior art described above and to provide a magnet roll for dry development that can achieve effective magnetic pole arrangement and weight reduction.
本発明の乾式現像用マグネットロールは、複数個の磁極
を有する永久磁石を軸に固定してなる永久磁石部材と、
該永久磁石部材を取囲んで同心状に回転自在に配置され
た円筒状の非磁性スリーブを有する乾式現像用マグネッ
トロールにおいて。The magnet roll for dry development of the present invention includes a permanent magnet member formed by fixing a permanent magnet having a plurality of magnetic poles to a shaft;
A magnet roll for dry development having a cylindrical non-magnetic sleeve concentrically and rotatably arranged surrounding the permanent magnet member.
前記永久磁石はその外周面の一部が前記非磁性スリーブ
と同心の円弧をなす断面形状を有すると共に、前記永久
磁石の外周面の円弧部と平面部に各各磁極を設けたこと
を特徴としている。The permanent magnet is characterized in that a part of its outer peripheral surface has a cross-sectional shape forming an arc concentric with the non-magnetic sleeve, and magnetic poles are provided on the arc portion and the flat portion of the outer peripheral surface of the permanent magnet. There is.
ヅ下本発明の詳細を図面により説明する。Below, details of the present invention will be explained with reference to the drawings.
第4図は本発明のマクネットロールに使用される永久磁
石部材の一例を示す断面図である。FIG. 4 is a sectional view showing an example of a permanent magnet member used in the Macnet roll of the present invention.
1 第4図において、1は永久磁石、2は軸、4
゜4′は永久磁石の外周面の平面部を各々示している。1 In Figure 4, 1 is a permanent magnet, 2 is a shaft, 4
4' indicates a flat portion of the outer peripheral surface of the permanent magnet.
なお図中二点鎖線は非磁性スリーブを示している。Note that the two-dot chain line in the figure indicates the nonmagnetic sleeve.
第4図の永久磁石部材は、半円筒状の永久磁石1を用い
、この永久(18石1を軸2に固定した点では第2図の
ものと同じである。しかして第4図の永久磁石は、永久
磁石1の外周面の円弧部に1磁極(N極)をそして外周
面の平面部4および4′に各々1磁極(S極)を配置(
また点で第2図のものと異なっている。このような磁極
配置によれば、図中破線で示す如くの磁化状態が得られ
る。すなわち、磁石内部におけろN極から5極に向う磁
束の流れをみると円弧部にあるN極より平面部4゜4′
にあるS極に向うので、平面部4と4′のなす角度θ(
図ではθ=18o°)以上の磁束の大きな流れを形成す
ることができる。The permanent magnet member shown in FIG. 4 is the same as that shown in FIG. The magnet has one magnetic pole (N pole) on the arcuate part of the outer peripheral surface of the permanent magnet 1, and one magnetic pole (S pole) on the flat parts 4 and 4' of the outer peripheral surface (
It also differs from the one in Figure 2 in some respects. With such a magnetic pole arrangement, a magnetization state as shown by the broken line in the figure can be obtained. In other words, if we look at the flow of magnetic flux from the N pole to the 5 poles inside the magnet, the flat part is 4° 4' from the N pole in the arcuate part.
Since the direction is toward the S pole at , the angle θ(
In the figure, a large flow of magnetic flux greater than θ=18o° can be formed.
上記の実施例では、永久磁石1として半円筒状のものを
用いたため一ヒ記角度θはj 8 D’と1.Cっだが
。In the above embodiment, since a semi-cylindrical permanent magnet 1 was used, the angle θ is j 8 D' and 1. C.
現像装置の構造等に応じて永久磁石1の形状を変えるこ
とにより上記角度を任意に設定できることはもちろんで
ある。Of course, the above angle can be arbitrarily set by changing the shape of the permanent magnet 1 depending on the structure of the developing device.
また上記の永久磁石1の材質としては、前述したツーラ
イト磁石(等方性でもあるいは異方性でもよい)を使用
できることはもちろんである。またツーライト粉末と樹
脂やプラスチック等の高分子重合体からなる原料を用い
て押出成形や射出成形等の手法により成形される可撓性
磁石(例えば米国特許第5,455.276号明M瞥、
特開昭57−150407号公報、特開昭57−L64
77i号公報等参照)を使用してもよく、この場合は軽
量化の点ではフェライト磁石より有利である。Furthermore, as the material of the permanent magnet 1, the aforementioned two-light magnet (which may be isotropic or anisotropic) can of course be used. In addition, flexible magnets (for example, U.S. Pat. No. 5,455.276,
JP-A-57-150407, JP-A-57-L64
77i, etc.) may be used; in this case, it is more advantageous than ferrite magnets in terms of weight reduction.
次に本発明の具体例を示す。Next, specific examples of the present invention will be shown.
外径29聴φ、内径10喘φの円筒状のバリウム7=ラ
イト磁石に、NS極間の角度θ1が90°となるように
第1図に示す如くの着磁を施し、この磁石を軸に固定し
た後外径31mm9’+内径60簡φのアルミニウム合
金製スリーブ内に組み込んだ。そしてスリーブ上の磁束
密度を沖1定したところ第5図の実線で示す磁束密度分
布が得られた。A cylindrical barium 7=light magnet with an outer diameter of 29 mm and an inner diameter of 10 mm is magnetized as shown in Figure 1 so that the angle θ1 between the NS poles is 90 degrees, and the magnet is After fixing it in place, it was assembled into an aluminum alloy sleeve with an outer diameter of 31 mm 9' and an inner diameter of 60 mm. When the magnetic flux density on the sleeve was set to a constant value, the magnetic flux density distribution shown by the solid line in FIG. 5 was obtained.
また上記の円筒状のツーライト磁石を軸心な含む平面で
2分割したものに第2図に示−fvt]<の着磁を施し
、上記と同様にスリーブに組み込んだ後−スリーブ上の
磁束密度分布を迎1定したところ、第5図の一点鎖線で
示す結果となった。j trわち、NS極間の角度θ2
は約70“′と上記の場合より約20°小さくなってし
まい1円筒状のツーライト磁石を用いた場合と同一の着
磁波形、同一の現像性能を得ることができなかった。In addition, after the above-mentioned cylindrical two-light magnet was divided into two along the plane containing the axis, magnetized as shown in Fig. 2 -fvt]<, and assembled into a sleeve in the same manner as above - the magnetic flux density on the sleeve When the distribution was set to 1, the result was shown by the dashed dotted line in FIG. j tr, that is, the angle θ2 between the NS poles
is about 70'', which is about 20° smaller than in the above case, and it was not possible to obtain the same magnetization waveform and the same developing performance as when using a single cylindrical two-light magnet.
これに対して上記の円筒状のツーライト磁石を軸心を含
む平面で2分割したものに第4図に示す如くの着磁を施
し、上記と同様にスリーブに組み込んだ後スリーブ上の
磁束密度分布を測定したところ第5図の破線で示す結果
か得られた。′1″なわちこの場合の着磁波形は、円筒
状の7=ニライト石を用いた場合の着磁波形と略同−と
なり、さらに現像装置に組み込んで行なった実装試験で
も同。On the other hand, the above-mentioned cylindrical two-light magnet was divided into two on a plane including the axis, magnetized as shown in Fig. 4, and then assembled into a sleeve in the same manner as above, and then magnetic flux density distribution on the sleeve. When measured, the results shown by the broken line in FIG. 5 were obtained. '1'', that is, the magnetization waveform in this case is approximately the same as the magnetization waveform when a cylindrical 7=nyrite stone is used, and the same is true in a mounting test conducted by incorporating it into a developing device.
等の現像性能が得られた。The developing performance was obtained.
なお磁石の長さが260簡の時に、上記の円筒状のフェ
ライト磁石を用いたマグネットロール(但し軸はステン
レス鋼製である)の重量は約12に9であるのに対し、
半円筒状のツーライト磁石を中し・たマグネットロール
の重量は約0.7Ffとなり、約O5即もの軽量化が可
能である。In addition, when the length of the magnet is 260 pieces, the weight of the magnet roll using the above-mentioned cylindrical ferrite magnet (however, the shaft is made of stainless steel) is about 12:9,
The weight of a magnet roll containing a semi-cylindrical two-light magnet is approximately 0.7 Ff, and can be reduced in weight by approximately O5.
以上に記述の如く1本発明によれば有効な現像性能が得
られる着磁波形を有しかつ軽量化も達成できる乾式現像
用マグネットロールが得られる。As described above, according to the present invention, a magnet roll for dry development can be obtained which has a magnetization waveform that provides effective development performance and which can also achieve weight reduction.
第1図ないし第5図は各々従来のマグネットロールに使
用される永久磁石部材の例を示1−断面図。
第4図は本発明のマグネットロールに使用される永久磁
石部材の一例を示す断面図、第5図は各種形状の永久磁
石のスリーブ上での磁束密度分布を1示す図である。
1:永久磁石、2I軸、 4 、4’・平面部。1 to 5 are cross-sectional views showing examples of permanent magnet members used in conventional magnet rolls. FIG. 4 is a sectional view showing an example of a permanent magnet member used in the magnet roll of the present invention, and FIG. 5 is a view showing magnetic flux density distributions on the sleeve of permanent magnets of various shapes. 1: Permanent magnet, 2I axis, 4, 4', flat part.
Claims (1)
永久磁石部材と、該永久磁石部材を取囲んで同lシ・状
に回転自在に配置された円筒状の非磁性スリーブを有す
る乾式現像用マグネットロールにおいて、前記永久磁石
はその外周面の一部が前記非磁性スリーブと同心の円弧
をなす断面形状を有すると共に、前記永久磁石の外周面
の円弧部と平面部に各々磁極を設けたことを特徴とする
乾式現像用マグネットロール− 2永久磁石として半円筒状のツーライト磁石又はフ・−
ライト粉末を高分子重合体で結着した可撓性磁石を用い
たことを特徴とする特許請求の範囲第1項記載の乾式現
像用マグネットロール。[Scope of Claims] 1. A permanent magnet member including a permanent magnet having a plurality of magnetic poles fixed to a shaft, and a cylindrical member that surrounds the permanent magnet member and is rotatably arranged in the same shape. In the magnet roll for dry development having a non-magnetic sleeve, the permanent magnet has a cross-sectional shape in which a part of the outer peripheral surface thereof forms an arc concentric with the non-magnetic sleeve, and a flat surface with the arc portion of the outer peripheral surface of the permanent magnet. A magnet roll for dry-type development characterized by having a magnetic pole provided in each part.
2. A magnet roll for dry development according to claim 1, characterized in that a flexible magnet in which light powder is bound with a high molecular weight polymer is used.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2018183A JPS59145507A (en) | 1983-02-09 | 1983-02-09 | Magnet-roll for dry development |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2018183A JPS59145507A (en) | 1983-02-09 | 1983-02-09 | Magnet-roll for dry development |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS59145507A true JPS59145507A (en) | 1984-08-21 |
JPH04371B2 JPH04371B2 (en) | 1992-01-07 |
Family
ID=12020005
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2018183A Granted JPS59145507A (en) | 1983-02-09 | 1983-02-09 | Magnet-roll for dry development |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59145507A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59152469A (en) * | 1983-02-18 | 1984-08-31 | Matsushita Electric Ind Co Ltd | Magnet roll for magnetic brush development |
JPS6060669A (en) * | 1983-09-13 | 1985-04-08 | Dai Ichi Seiko Co Ltd | Magnet roll for magnetic brush development of dry type electronic copying machine |
JPS63133816A (en) * | 1986-11-20 | 1988-06-06 | 鐘淵化学工業株式会社 | Magnet roll and manufacture of the same |
JPH01207916A (en) * | 1988-02-16 | 1989-08-21 | Matsushita Electric Ind Co Ltd | Manufacture of magnet roll |
-
1983
- 1983-02-09 JP JP2018183A patent/JPS59145507A/en active Granted
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59152469A (en) * | 1983-02-18 | 1984-08-31 | Matsushita Electric Ind Co Ltd | Magnet roll for magnetic brush development |
JPH0469388B2 (en) * | 1983-02-18 | 1992-11-06 | Matsushita Electric Ind Co Ltd | |
JPS6060669A (en) * | 1983-09-13 | 1985-04-08 | Dai Ichi Seiko Co Ltd | Magnet roll for magnetic brush development of dry type electronic copying machine |
JPH0469789B2 (en) * | 1983-09-13 | 1992-11-09 | Enplas Corp | |
JPS63133816A (en) * | 1986-11-20 | 1988-06-06 | 鐘淵化学工業株式会社 | Magnet roll and manufacture of the same |
JPH0682579B2 (en) * | 1986-11-20 | 1994-10-19 | 鐘淵化学工業株式会社 | Magnetoroll and manufacturing method thereof |
JPH01207916A (en) * | 1988-02-16 | 1989-08-21 | Matsushita Electric Ind Co Ltd | Manufacture of magnet roll |
JP2563436B2 (en) * | 1988-02-16 | 1996-12-11 | 松下電器産業株式会社 | Magnet roll manufacturing method |
Also Published As
Publication number | Publication date |
---|---|
JPH04371B2 (en) | 1992-01-07 |
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