JPS637604A - Plastic magnet roll - Google Patents
Plastic magnet rollInfo
- Publication number
- JPS637604A JPS637604A JP15120186A JP15120186A JPS637604A JP S637604 A JPS637604 A JP S637604A JP 15120186 A JP15120186 A JP 15120186A JP 15120186 A JP15120186 A JP 15120186A JP S637604 A JPS637604 A JP S637604A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic pole
- magnetic
- permanent magnet
- groove
- developing
- 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
- 239000004033 plastic Substances 0.000 title claims description 12
- 229920003023 plastic Polymers 0.000 title claims description 12
- 239000000463 material Substances 0.000 claims description 5
- 239000006247 magnetic powder Substances 0.000 claims description 4
- 230000004907 flux Effects 0.000 abstract description 18
- 230000000694 effects Effects 0.000 description 7
- 238000000465 moulding Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
- Cleaning In Electrography (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は電子写真や静電記録等において、現像ロール若
しくはクリーニングロールとして使用するマグネットロ
ールに関するものであり、永久磁石を磁粉と有機結合材
料とから形成したプラスチックマグネットロールの改良
に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnet roll used as a developing roll or a cleaning roll in electrophotography, electrostatic recording, etc. This invention relates to improvements in plastic magnet rolls formed from.
従来のプラスチックマグネットロールは１例えば第３図
に示すように、磁粉と有機結合材料とからなる横断面円
形の永久磁石Ｉの中心に、シャフト２が貫通し、永久磁
石Ｉの外表面には、４個の磁極Ｎ、、Ｎ、、Ｓ、、Ｓ２
が夫々異極が隣接するように配設しである。なお前記磁
極は何れもシャフト２の軸線と平行に設ける。そして例
えば磁極Ｓ。In a conventional plastic magnet roll 1, for example, as shown in FIG. 3, a shaft 2 passes through the center of a permanent magnet I made of magnetic powder and an organic bonding material and has a circular cross section, and the outer surface of the permanent magnet I has a 4 magnetic poles N, , N, , S, , S2
are arranged so that different poles are adjacent to each other. Note that all of the magnetic poles are provided parallel to the axis of the shaft 2. And for example, magnetic pole S.
を現像磁極とし、感光ドラム（図示せず）と対向させて
使用するのである。このようなプラスチックマグネット
ロールは１例えば特開昭５７−１３０４０７号、同５’
ｌ−１７０５０１号、同５９−２２６３６７号公報に開
示されている。is used as a developing magnetic pole, and is used in opposition to a photosensitive drum (not shown). Such plastic magnet rolls are disclosed in, for example, JP-A-57-130407 and JP-A-57-130407;
It is disclosed in No. 1-170501 and No. 59-226367.
上記のプラスチ、クマグネソトロールを成形するには、
磁気回路を内蔵させた成形金型内に、予め前記シャフト
２を挿入しておき、極異方性化状態において永久磁石ｌ
を構成する材料、即ちフェライト粉末等の磁粉とポリエ
チレン、ポリアミド。To mold the above plasti, Kumagnesotrol,
The shaft 2 is inserted in advance into a molding die having a built-in magnetic circuit, and the permanent magnet l is inserted in the polar anisotropic state.
The materials that make up the material include magnetic powder such as ferrite powder, polyethylene, and polyamide.
エチレン共重合体等の樹脂を主体とする混合物（コンパ
ウンド）を注入充填させて、射出成形等の手段により成
形するのが一触的である。このようにして成形した後、
所定の着磁を行なったプラスチックマグネットロールの
磁束波形は１例えば第４図に示すように現われる。第４
図は磁束密度の大きさを極座標で表示したものである。One quick method is to inject and fill a mixture (compound) mainly consisting of a resin such as an ethylene copolymer, and then mold it by means such as injection molding. After forming in this way,
The magnetic flux waveform of a plastic magnet roll that has been magnetized in a predetermined manner appears as shown in FIG. 4, for example. Fourth
The figure shows the magnitude of magnetic flux density in polar coordinates.
同図に示す磁束波形の形状は、成形用金型および磁気回
路を一旦形成した場合には、変更することができないの
みならず、磁束波形の部分的変更もまた不可能である。The shape of the magnetic flux waveform shown in the figure cannot be changed once the molding die and the magnetic circuit have been formed, and it is also impossible to partially change the magnetic flux waveform.
−方最近の現像装置においては、現像用磁極の特性をよ
りシャープにする要請があり。- On the other hand, in recent developing devices, there is a demand for sharper characteristics of the developing magnetic pole.
前記磁束波形の分布もよりシャープにする必要がある。It is also necessary to make the distribution of the magnetic flux waveform sharper.
すなわち第４図において 現像磁極Ｓｌの磁束波形の幅
Ｗを小さくする必要がある。しかしながら従来のものに
おいては、磁束波形を任意に変更することができず、前
記要請に対しては全く対応することが不可能であるとい
う問題点がある。That is, in FIG. 4, it is necessary to reduce the width W of the magnetic flux waveform of the developing magnetic pole Sl. However, in the conventional method, the magnetic flux waveform cannot be changed arbitrarily, and there is a problem in that it is impossible to meet the above-mentioned requirements at all.
本発明は上記のような従来の技術に存在する問題点を解
消し、現像磁極のような特定磁極における磁束波形を変
更することができるようなプラスチックマグネットロー
ルを提供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 existing in the conventional technology and to provide a plastic magnet roll that can change the magnetic flux waveform at a specific magnetic pole such as a developing magnetic pole.
上記従来の問題点解決のため１本発明においては、磁粉
と有機結合材料とからなる永久磁石を横断面円形に形成
し、この永久磁石の中心にシャフトを貫通して設けると
共に、前記永久磁石の外表面に前記シャフトと平行に複
数個の磁極を異極が隣接するように配設したプラスチッ
クマグネットロールにおいて、前記複数個の磁極の中か
ら選んだ特定磁極と、この特定磁極と隣接する他の磁極
との間に、前記シャフトの軸線と平行する少なくとも１
個の溝を設ける。という技術的手段を採用したのである
。In order to solve the above-mentioned conventional problems, in the present invention, a permanent magnet made of magnetic powder and an organic bonding material is formed with a circular cross section, a shaft is provided in the center of the permanent magnet, and a shaft is provided in the center of the permanent magnet. In a plastic magnet roll having a plurality of magnetic poles arranged on the outer surface in parallel with the shaft so that different poles are adjacent to each other, a specific magnetic pole selected from the plurality of magnetic poles and other magnetic poles adjacent to the specific magnetic pole are arranged. at least one parallel to the axis of the shaft between the magnetic pole and the
Provide several grooves. This technical method was adopted.
上記の構成により、現像磁極Ｓ１における磁束波形の幅
は１例えば第２図に示すようにＷａとなり、前記第４図
における幅Ｗと比較して小さくすることができるという
作用があり１前記溝の設置数９寸法、形状等の選定によ
り、磁束波形の幅を変更することができるのである。With the above configuration, the width of the magnetic flux waveform at the developing magnetic pole S1 is 1, for example, Wa as shown in FIG. 2, which has the effect of being smaller than the width W shown in FIG. The width of the magnetic flux waveform can be changed by selecting the dimensions, shape, etc. of the nine installed units.
第１図は本発明の実施例を示す横断面図であり。 FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
同一部分は前記第３図と同一の参照符号で示す。Identical parts are designated by the same reference numerals as in FIG. 3 above.
同図において、現像磁極Ｓ、と隣接する磁極Ｎ２との間
の永久磁石１の表面には、横断面■字形の溝３を設ける
。なお溝３はシャフト２の軸線と平行させると共に、少
なくとも永久磁石１の作用範囲（例えば複写用紙の幅寸
法）に亘って設ける。In the figure, a groove 3 having a square cross section is provided on the surface of the permanent magnet 1 between the developing magnetic pole S and the adjacent magnetic pole N2. The groove 3 is parallel to the axis of the shaft 2 and is provided over at least the action range of the permanent magnet 1 (for example, the width of the copy sheet).
第２図は上記第１図に示すプラスチックマグネットロー
ルの磁束波形を示す図であり、前記第１を図と同様に磁
束密度の大きさを極座標で示したものである。同図にお
いて矢印Ａに示す位置は５前記第１図における溝３の位
置に対応する位置である。同図から明らかなように、現
像磁極Ｓ１における磁束波形の幅Ｗａは、前記第４図に
示すものと比較して大略８０％となっており、現像磁Ｊ
ｉＳ１の特性をよりシャープにする作用を具（Ｉｉｉ？
する。FIG. 2 is a diagram showing the magnetic flux waveform of the plastic magnet roll shown in FIG. 1, and similarly to the first diagram, the magnitude of the magnetic flux density is shown in polar coordinates. In the figure, the position indicated by arrow A corresponds to the position of the groove 3 in FIG. As is clear from the figure, the width Wa of the magnetic flux waveform at the developing magnetic pole S1 is approximately 80% of that shown in FIG.
It has the effect of sharpening the characteristics of iS1 (Iii?
do.
なお溝３の幅Ｗおよび深さｄは、各々永久磁石１の直径
の１／ｌＯ以上および１／２０以上とするのが好ましく
、この寸法未満では上記の作用か望めないか若しくは不
充分であるため不都合である。Note that the width W and depth d of the groove 3 are preferably 1/1O or more and 1/20 or more of the diameter of the permanent magnet 1, respectively; if the dimensions are less than this, the above effect cannot be expected or is insufficient. This is inconvenient.
本実施例においては、永久磁石の磁［近間に設）する溝
が１個の場合を示したが、複数個としてもよく、また現
像磁極を挟んで両側に設けても作用は同一である。また
溝の横断面形状は、■字形以外の他の形状を任意に選定
できることは勿論である。In this example, the case is shown in which there is one groove (provided near the magnet) of the permanent magnet, but it is also possible to have a plurality of grooves, and the effect is the same even if they are provided on both sides with the developing magnetic pole in between. . Further, it goes without saying that the cross-sectional shape of the groove can be arbitrarily selected from any shape other than the ``■'' shape.
更に永久磁石表面に配設する複数の磁極は１等間隔（対
称配置）であっても不等間隔（非対称配置）であっても
よい。更にまた永久磁石の外表面に前記の溝を形成する
手段は、成形用金型の成形キャビティ内に、前記溝に相
当する横断面に形成したスペーサー若しくは金型部材を
突出させるのが最も一般的であるが、永久磁石を成形後
において２例えば機械加工等の手段によって形成しても
よい。Further, the plurality of magnetic poles disposed on the surface of the permanent magnet may be arranged at equal intervals (symmetrical arrangement) or at unequal intervals (asymmetrical arrangement). Furthermore, the most common means for forming the grooves on the outer surface of the permanent magnet is to protrude a spacer or mold member formed in a cross section corresponding to the grooves into a molding cavity of a molding die. However, the permanent magnet may also be formed by means such as machining after molding.
本発明は以上記述のような構成および作用であるから、
永久磁石に設けた複数個の磁極の中の特定磁極の磁束波
形における幅を小さくすることにより、特定磁極の特性
をシャープにすることができる。例えば特定磁極が現像
６ｆｆｉである場合には。Since the present invention has the structure and operation as described above,
By reducing the width of the magnetic flux waveform of a specific magnetic pole among the plurality of magnetic poles provided on the permanent magnet, the characteristics of the specific magnetic pole can be sharpened. For example, if the specific magnetic pole is development 6ffi.
現像性能を著るしく向上し２画質を大幅に向上させ得る
という効果がある。This has the effect of significantly improving developing performance and significantly improving image quality.
第１図および第２図は各々本発明の実施例を示すマグネ
ットロールの横断面図および磁束波形を示す図、第３図
および第４図は各々従来のマグネットロールの横断面図
および磁束波形を示す図である。
１：永久磁石、２：シャフト、３：溝。FIGS. 1 and 2 are cross-sectional views and magnetic flux waveforms of a magnet roll according to an embodiment of the present invention, respectively, and FIGS. 3 and 4 are cross-sectional views and magnetic flux waveforms of a conventional magnetic roll, respectively. FIG. 1: Permanent magnet, 2: Shaft, 3: Groove.
Claims (3)
円形に形成し、この永久磁石の中心にシャフトを貫通し
て設けると共に、前記永久磁石の外表面に前記シャフト
と平行に複数個の磁極を異極が隣接するように配設した
プラスチックマグネットロールにおいて、前記複数個の
磁極の中から選んだ特定磁極と、この特定磁極と隣接す
る他の磁極との間に、前記シャフトの軸線と平行する少
なくとも１個の溝を設けたことを特徴とするプラスチッ
クマグネットロール。(1) A permanent magnet made of magnetic powder and an organic bonding material is formed to have a circular cross section, and a shaft is provided at the center of the permanent magnet, and a plurality of magnets are provided on the outer surface of the permanent magnet in parallel with the shaft. In a plastic magnet roll in which magnetic poles are arranged such that different poles are adjacent to each other, there is a line between the axis of the shaft and a specific magnetic pole selected from the plurality of magnetic poles and another magnetic pole adjacent to the specific magnetic pole. A plastic magnetic roll characterized in that it is provided with at least one parallel groove.
た特許請求の範囲第１項記載のプラスチックマグネット
ロール。(2) The plastic magnet roll according to claim 1, wherein a plurality of magnetic poles are arranged at equal or unequal intervals.
若しくは第２項記載のプラスチックマグネットロール。(3) The plastic magnet roll according to claim 1 or 2, wherein the specific magnetic pole is a developing magnetic pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15120186A JPS637604A (en) | 1986-06-27 | 1986-06-27 | Plastic magnet roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15120186A JPS637604A (en) | 1986-06-27 | 1986-06-27 | Plastic magnet roll |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS637604A true JPS637604A (en) | 1988-01-13 |
Family
ID=15513450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15120186A Pending JPS637604A (en) | 1986-06-27 | 1986-06-27 | Plastic magnet roll |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS637604A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020003640A (en) * | 2018-06-28 | 2020-01-09 | コニカミノルタ株式会社 | Magnet roller, development roller, development device and image formation apparatus |
-
1986
- 1986-06-27 JP JP15120186A patent/JPS637604A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020003640A (en) * | 2018-06-28 | 2020-01-09 | コニカミノルタ株式会社 | Magnet roller, development roller, development device and image formation apparatus |
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