JPH0452954B2 - - Google Patents
Info
- Publication number
- JPH0452954B2 JPH0452954B2 JP59034382A JP3438284A JPH0452954B2 JP H0452954 B2 JPH0452954 B2 JP H0452954B2 JP 59034382 A JP59034382 A JP 59034382A JP 3438284 A JP3438284 A JP 3438284A JP H0452954 B2 JPH0452954 B2 JP H0452954B2
- Authority
- JP
- Japan
- Prior art keywords
- developer
- roll
- storage tank
- developing
- development
- 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
- 210000005069 ears Anatomy 0.000 claims description 13
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000005405 multipole Effects 0.000 claims description 2
- 239000000696 magnetic material Substances 0.000 claims 1
- 230000018109 developmental process Effects 0.000 description 20
- 108091008695 photoreceptors Proteins 0.000 description 7
- 230000000903 blocking effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920003225 polyurethane elastomer Polymers 0.000 description 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
Description
【発明の詳細な説明】
（技術分野）
この発明は電子写真方式の乾式現像装置に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an electrophotographic dry developing device.
（技術分野）
従来の乾式現像装置では、静電潜像担持体に対
向して現像ロールが設けられており、この現像ロ
ールは非磁性中空スリーブ（以下スリーブとい
う）と、このスリーブ内に設けられた複数極の永
久磁石とから構成され、スリーブと永久磁石とは
相対的に回転可能な構造となつている。現像ロー
ル周傍には現像剤収容槽が設けられ、この収容槽
内部には現像剤が収容されている。現像剤収容槽
の一部にはカツトアウト部が設けられており、現
像ロールは、収容槽との間に第１の開口（現像剤
供給口）及び第２の開口（現像剤回収口）を形成
するように、その一部が前記カツトアウト部を介
して収容槽内側に入り込んでいる。スリーブ周面
に磁気吸引された現像剤はスリーブと永久磁石の
回転によつて、現像剤収容槽内から前記第１の開
口より排出され現像領域まで搬送される。現像領
域では現像剤収容槽から排出供給された現像剤の
一部が静電潜像担持体の静電潜像部に現像のため
に付着し、残りの現像剤は前記第２の開口より現
像剤収容槽内に回収されるようになつている。(Technical Field) In a conventional dry-type developing device, a developing roll is provided opposite to an electrostatic latent image carrier, and this developing roll includes a non-magnetic hollow sleeve (hereinafter referred to as a sleeve) and a non-magnetic hollow sleeve provided within the sleeve. The sleeve and the permanent magnet are constructed to be relatively rotatable. A developer storage tank is provided around the developing roll, and the developer is stored inside the storage tank. A cut-out portion is provided in a part of the developer storage tank, and the developing roll forms a first opening (developer supply port) and a second opening (developer recovery port) between the developer roll and the storage tank. A part of it enters the inside of the storage tank through the cut-out part. The developer magnetically attracted to the circumferential surface of the sleeve is discharged from the developer storage tank through the first opening and conveyed to the development area by the rotation of the sleeve and the permanent magnet. In the development area, a part of the developer discharged and supplied from the developer storage tank adheres to the electrostatic latent image portion of the electrostatic latent image carrier for development, and the remaining developer is released from the second opening for development. It is designed to be collected in a chemical storage tank.
このような従来の装置に於ては、非現像時もし
くは装置停止時に於ても常に現像剤が静電潜像担
持体に接触しているため起動時の回転による衝
撃、振動によつて現像剤が落下、飛散し印字用紙
を汚す欠点があつた。 In such conventional devices, since the developer is always in contact with the electrostatic latent image carrier even when not developing or when the device is stopped, the developer is There was a drawback that the paper would fall and scatter, staining the printing paper.
また、この種の装置では、現像終了後まず永久
磁石の回転を止めて、スリーブ周面上の現像剤を
スリーブの回転によつて前記現像剤収容槽内に回
収した後スリーブの回転を止めるようにすると、
現像剤が現像剤収容槽の回収開口部近傍で塊集と
なり、現像装置としてはブロツキングが発生して
画質が劣化する欠点があつた。 In addition, in this type of device, after the development is completed, the rotation of the permanent magnet is first stopped, and the developer on the circumferential surface of the sleeve is collected into the developer storage tank by the rotation of the sleeve, and then the rotation of the sleeve is stopped. Then,
The developer is agglomerated near the collection opening of the developer storage tank, and the developing device suffers from blocking, resulting in deterioration of image quality.
（発明の課題）
この発明は上述のごとき欠点を解消するために
なされたものであつて、その目的は、現像ロール
周面に磁気的に吸着し現像を寄与する現像剤の供
給量を制御することにより現像剤の落下、飛散及
びブロツキングの発生を効果的に防止できる乾式
現像装置を提供することにある。(Problem to be solved by the invention) The present invention was made to solve the above-mentioned drawbacks, and its purpose is to control the amount of developer supplied that magnetically attracts to the circumferential surface of the developing roll and contributes to development. Therefore, it is an object of the present invention to provide a dry type developing device that can effectively prevent developer from falling, scattering, and blocking.
この発明の要点は、非現像点もしくは装置停止
時に現像ロール周面上への現像剤の供給量を減量
して現像剤を静電潜像担持体に接触させないよう
にしたことであり、そのための手段としてステツ
プモータによるマグネツトロールの回転数制御を
行う。 The key point of this invention is to reduce the amount of developer supplied onto the peripheral surface of the developing roll at non-developing points or when the device is stopped so that the developer does not come into contact with the electrostatic latent image carrier. As a means of controlling the rotation speed of the magnet roll, a step motor is used.
（発明の構成及び作用）
第１図は、この発明の一実施例の乾式現像装置
の現像ロール近傍を示す部分断面図である。(Structure and operation of the invention) FIG. 1 is a partial sectional view showing the vicinity of a developing roll of a dry developing device according to an embodiment of the present invention.
先ず構成について説明する。静電潜像担持体と
しては一般にセレン等の感光剤により形成された
感光体ドラム１が用いられる。この感光体ドラム
１は図示矢印Ｅ方向に一定速度で回転を行なう。
そして現像ロール２が、感光体ドラム１と微小間
隔Ｆ（通常0.3〜0.6mm）を保つて対向するごとく
設けられている。現像ロール２は、非磁性中空ス
リーブ２ａと、該スリーブ２ａの内側にて円周方
向にＮ極とＳ極とが交互に配置され、軸方向に伸
びた複数極の永久磁石２ｂとから成る。スリーブ
２ａと永久磁石２ｂとは相対的に回転可能な構造
となつている。現像ロール２の周傍には現像剤収
容槽３が設けられ、また現像ロール２の円周方向
の所定位置付近（ロール２の下側）には、ロール
の軸方向全長にわたりフエルト又はポリウレタン
ゴム等の可撓性材料で構成されたストツパ４が図
示のごとく現像ロール２に圧接するように設けら
れている。更に現像ロール２の円周方向の別の所
定位置付近（ロール２の上側）には軸方向全長に
わたつて微小な間隔で開口する開口部５が設けら
れている。現像剤収容槽３に収容された現像剤６
は現像剤収容槽３の図示しない上部補給口より補
給される。この補給口は補給時のみ開放され、通
常は閉じている。従つて、現像剤収容槽３に収容
された現像剤６は開口部５を通過してのみ現像領
域に排出供給される構成となつている。 First, the configuration will be explained. A photosensitive drum 1 made of a photosensitive agent such as selenium is generally used as the electrostatic latent image carrier. The photosensitive drum 1 rotates at a constant speed in the direction of arrow E in the figure.
A developing roll 2 is provided so as to face the photosensitive drum 1 with a small distance F (usually 0.3 to 0.6 mm) maintained therebetween. The developing roll 2 consists of a non-magnetic hollow sleeve 2a and a multi-pole permanent magnet 2b extending in the axial direction and having north and south poles arranged alternately in the circumferential direction inside the sleeve 2a. The sleeve 2a and the permanent magnet 2b have a relatively rotatable structure. A developer storage tank 3 is provided around the periphery of the developing roll 2, and near a predetermined position in the circumferential direction of the developing roll 2 (underside of the roll 2), felt or polyurethane rubber or the like is provided over the entire axial length of the roll. A stopper 4 made of a flexible material is provided so as to come into pressure contact with the developing roll 2 as shown. Further, in the vicinity of another predetermined position in the circumferential direction of the developing roll 2 (on the upper side of the roll 2), openings 5 are provided which are opened at minute intervals over the entire length in the axial direction. Developer 6 accommodated in developer storage tank 3
is replenished from an upper replenishment port (not shown) of the developer storage tank 3. This supply port is only open when replenishing, and is normally closed. Therefore, the developer 6 contained in the developer storage tank 3 is discharged and supplied to the developing area only after passing through the opening 5.
次にこの装置の動作について説明する。現像が
開始されると、図示せぬステツプモータの駆動に
より永久磁石２ｂが図示矢印Ａ方向に回転し、現
像剤６の連鎖は磁束の流れの方向変化にそつて永
久磁石２ｂと逆方向に自転運動する。従つて、現
像剤収容槽３内に収容された現像剤６は開口部５
を通つてストツパ４に向けて搬送される。永久磁
石２ｂの回転にやや遅れてスリーブ２ａが図示せ
ぬモータの駆動により図示矢印Ｂ方向に永久磁石
２ｂの回転速度よりかなり低速で回転を開始す
る。この遅延時間はスリーブ２ａと永久磁石２ｂ
の回転数及び永久磁石２ｂの極数によつて決定さ
れる。ただしスリーブ２ａの回転が極端に遅くな
ると現像剤６がストツパ４近傍にたまつて落下す
る危険がある。このようにしてスリーブ２ａ及び
永久磁石２ｂが回動してしばらくすると、スリー
ブ２ａの周面に形成される磁気ブラシの穂の長さ
は均衡する。均衡状態に於ける現像剤６の搬送状
態を観測すると、スリーブ２ａ周面上に形成され
た現像剤層の内層側は主としてスリーブ２ａの回
転に依存して搬送され、図示矢印Ｄ方向に現像剤
６を現像剤収容槽３へ回収するごとく移動してい
る。一方、外層側は主として永久磁石２ｂの回転
に依存してスリーブ２ａの周面上を転がるように
搬送され、図示矢印Ｃ方向に移動している。スト
ツパ４の近傍では、永久磁石２ｂの回転に依存し
て図示矢印Ｃ方向に搬送された外層側の現像剤６
はＵターンする状態で内層側へ移行して、スリー
ブ２ａの回転に依存して図示矢印Ｄ方向に搬送さ
れる。このような工程で現像剤６の搬送状態は均
衡する。従つて、現像により感光体ドラム１へ現
像剤６が付着し、開口部５からストツパ４に至る
現像領域内の現像剤６が消費されても現像剤収容
槽３から順次現像剤６が供給され、スリーブ２ａ
の周面に形成される現像剤６の穂の長さは、常に
スリーブ２ａの回転数及び永久磁石２ｂの回転数
と極数により定まる所定の穂の長さに均衡する。 Next, the operation of this device will be explained. When development starts, the permanent magnet 2b is driven by a step motor (not shown) to rotate in the direction of arrow A, and the chain of developer 6 rotates in the opposite direction to the permanent magnet 2b as the direction of the magnetic flux changes. Exercise. Therefore, the developer 6 accommodated in the developer storage tank 3 flows through the opening 5.
It is conveyed towards the stopper 4 through the. A little later than the rotation of the permanent magnet 2b, the sleeve 2a starts rotating in the direction of the arrow B in the figure at a speed considerably lower than the rotational speed of the permanent magnet 2b by the drive of a motor (not shown). This delay time is between the sleeve 2a and the permanent magnet 2b.
It is determined by the rotation speed of the permanent magnet 2b and the number of poles of the permanent magnet 2b. However, if the rotation of the sleeve 2a becomes extremely slow, there is a risk that the developer 6 will accumulate near the stopper 4 and fall. After a while of rotation of the sleeve 2a and the permanent magnet 2b in this manner, the lengths of the ears of the magnetic brush formed on the circumferential surface of the sleeve 2a become balanced. Observing the conveyance state of the developer 6 in a balanced state, the inner layer side of the developer layer formed on the circumferential surface of the sleeve 2a is conveyed mainly depending on the rotation of the sleeve 2a, and the developer is transferred in the direction of the arrow D shown in the figure. 6 to be collected into the developer storage tank 3. On the other hand, the outer layer is conveyed to roll on the circumferential surface of the sleeve 2a mainly depending on the rotation of the permanent magnet 2b, and is moving in the direction of arrow C in the figure. In the vicinity of the stopper 4, the developer 6 on the outer layer side is transported in the direction of arrow C in the figure depending on the rotation of the permanent magnet 2b.
transfers to the inner layer side in a U-turn state, and is conveyed in the direction of arrow D in the figure depending on the rotation of the sleeve 2a. In this process, the conveyance state of the developer 6 is balanced. Therefore, even if the developer 6 adheres to the photosensitive drum 1 during development and the developer 6 in the development area from the opening 5 to the stopper 4 is consumed, the developer 6 is sequentially supplied from the developer storage tank 3. , sleeve 2a
The length of the ears of the developer 6 formed on the circumferential surface of the developer 6 is always balanced to a predetermined length of the ears determined by the number of rotations of the sleeve 2a and the number of rotations and number of poles of the permanent magnet 2b.
第２図は、この発明における現像剤６の穂の長
さが均衡する一例を説明するための図である。こ
の例は、スリーブ２ａの回転数を34RPMとし、
永久磁石２ｂとして16極600ガウスの磁束密度を
有するマグネツトロールを使用した場合であり、
第２図にはその場合の永久磁石２ｂの回転数変化
によつて均衡する現像剤６の穂の長さと永久磁石
２ｂの回転数との関係が示されている。この穂の
長さは印字濃度を決定づける有力な条件であり、
通常感光体ドラム１とスリーブ２ａの間隔Ｆ（通
常0.3〜0.6mm）に対して現像状態で約２倍（約0.5
〜1.4mm）に設定される。 FIG. 2 is a diagram for explaining an example in which the lengths of the ears of the developer 6 are balanced in the present invention. In this example, the rotation speed of the sleeve 2a is 34RPM,
This is a case where a magnet roll having 16 poles and a magnetic flux density of 600 Gauss is used as the permanent magnet 2b,
FIG. 2 shows the relationship between the length of the ears of the developer 6 and the rotation speed of the permanent magnet 2b, which is balanced by the change in the rotation speed of the permanent magnet 2b. The length of this spike is a powerful condition that determines print density.
Normally, the distance F between the photosensitive drum 1 and the sleeve 2a (usually 0.3 to 0.6 mm) is approximately twice that in the developing state (approximately 0.5 mm).
~1.4mm).
このような現像剤６の穂の長さと永久磁石２ｂ
の回転数との関係に鑑みて、本実施例の装置で
は、非現像時若しくは現像終了後には永久磁石２
ｂの回転をあらかじめ設定された時間内に減速し
て現像剤６の穂の長さを間隔Ｆと同等かそれ以下
に均衡させた後、永久磁石２ｂ及びスリーブ２ａ
の回転を停止する。従つて、現像剤６は非現像時
若しくは現像終了停止時には感光体ドラム１に摺
接又は接触していないため、感光体ドラム１の回
転起動による衝撃、振動及び装置全体の衝撃、振
動によつて発生する現像剤６が落下して飛散する
のを防止できる。 The length of the ears of the developer 6 and the permanent magnet 2b
In view of the relationship between the number of rotations of the permanent magnet 2 and the number of rotations of the
After decelerating the rotation of b within a preset time to balance the length of the ears of the developer 6 to be equal to or less than the interval F, the permanent magnet 2b and the sleeve 2a
stop rotating. Therefore, since the developer 6 is not in sliding contact with or in contact with the photoreceptor drum 1 during non-development or when development is stopped, the developer 6 is not in sliding contact with or in contact with the photoreceptor drum 1. It is possible to prevent the generated developer 6 from falling and scattering.
また第１図では、ストツパ４が現像領域を隔成
する役割の外に現像剤収容槽３の壁の役割を兼用
していたが、この両者を別個の部材で構成する場
合には、ストツパ４としてフエルト又はポリウレ
タンゴム等の可撓性部材を用いることなく微小な
隙間にすることができる。 In addition, in FIG. 1, the stopper 4 also serves as the wall of the developer storage tank 3 in addition to the role of separating the developing area, but when the two are constructed from separate members, the stopper 4 As a result, the gap can be made small without using a flexible member such as felt or polyurethane rubber.
なお、現像終了時には永久磁石２ｂの回転を先
に停止しやや遅れてスリーブ２ａの回転を停止す
れば現像領域内のスリーブ２ａ周面に付着した現
像剤６を全て現像剤収容槽３内に回収することが
可能である。しかし起動、停止の回数が多くなる
と開口部５の近傍で現像剤６の塊集が生じて現像
装置としてはブロツキングが発生し、極度に画質
が劣化する。 Furthermore, when the development is completed, if the rotation of the permanent magnet 2b is stopped first and the rotation of the sleeve 2a is stopped a little later, all the developer 6 attached to the circumferential surface of the sleeve 2a in the development area is collected into the developer storage tank 3. It is possible to do so. However, if the number of startups and stops increases, the developer 6 will collect in the vicinity of the opening 5, causing blocking in the developing device, resulting in extremely poor image quality.
第３図は、第１図に示す現像装置の駆動部の構
成の一例を示すブロツク図である。 FIG. 3 is a block diagram showing an example of the configuration of a driving section of the developing device shown in FIG. 1.
現像開始と共に制御回路７より信号７ａ及び７
ｂが出力され、これらの信号によりモータ８ａ及
び８ｂがそれぞれ駆動する。そして、感光体ドラ
ム１、中空スリーブ２ａ及び永久磁石２ｂが、ギ
ヤ又はベルト等の伝達駆動手段９ａ，９ｂ，９ｃ
を介してそれぞれ所定の速度で回転する。一方、
現像剤６は、前記各部材の回転開始後ただちに第
１図の開口部５から供給されてストツパ４に至
り、スリーブ２ａ周面に形成される現像剤６の磁
気ブラシの穂の長さは均衡する。この状態で感光
体ドラム１に形成された潜像が摺擦現像される。 At the start of development, the control circuit 7 sends signals 7a and 7.
b is output, and these signals drive motors 8a and 8b, respectively. The photosensitive drum 1, hollow sleeve 2a and permanent magnet 2b are connected to transmission drive means 9a, 9b, 9c such as gears or belts.
each rotate at a predetermined speed. on the other hand,
Immediately after the rotation of each member starts, the developer 6 is supplied from the opening 5 shown in FIG. do. In this state, the latent image formed on the photoreceptor drum 1 is developed by rubbing.
現像過程で感光体ドラム１の潜像は、印字すべ
き印字データを図示せぬ光源、たとえばレーザま
たは発光ダイオード（LED）等の照射手段によ
つて形成される。通常感光体ドラム１への潜像密
度すなわち印字密度が１インチ（約2.54cm）当り
240〜400画素で画像が形成される。この場合にお
いて、現像領域内で消費される現像剤６の消費量
は感光体ドラム１の潜像密度、すなわち印字密度
によつて大幅に左右されるため、従来の方式では
現像ロール２の周面上の現像剤６の穂の長さが不
均一となり、印字密度の変化により印字濃度もま
た不均一になり高印字品質の印刷を得ることがで
きない。そこでこの発明では次のようにして印字
濃度の均一化が行なわれる。 During the development process, a latent image on the photosensitive drum 1 is formed with print data to be printed by a light source (not shown), such as an irradiation means such as a laser or a light emitting diode (LED). Normally, the latent image density, that is, the printing density on the photoreceptor drum 1 is per inch (approximately 2.54 cm).
An image is formed with 240 to 400 pixels. In this case, since the amount of developer 6 consumed within the development area is largely influenced by the latent image density of the photoreceptor drum 1, that is, the print density, in the conventional method, the peripheral surface of the development roll 2 The length of the ears of the upper developer 6 becomes non-uniform, and the print density also becomes non-uniform due to the change in print density, making it impossible to obtain high quality printing. Therefore, in the present invention, the print density is made uniform as follows.
現像終了後には制御回路部７であらかじめ設定
された回転数制御回路（図示せず）により信号７
ｂから信号７ｃに直ちに切り換わりモータ８ｂの
回転数が減速される。従つて、この状態になると
ただちにスリーブ２ａ周面に形成された磁気ブラ
シの穂の長さは、半減した長さで均衡し、感光体
ドラム１と摺擦しなくなる。この状態で信号７ａ
及び信号７ｃを停止すれば感光体ドラム１に現像
剤６がほぼ無接触となつた状態で装置の回転が全
て停止する。 After the development is completed, a rotation speed control circuit (not shown) set in advance in the control circuit section 7 outputs a signal 7.
The signal 7c is immediately switched from the signal 7c, and the rotational speed of the motor 8b is reduced. Therefore, as soon as this state is reached, the length of the ears of the magnetic brush formed on the circumferential surface of the sleeve 2a becomes balanced by being halved, and they no longer rub against the photoreceptor drum 1. In this state, signal 7a
When the signal 7c is stopped, the entire rotation of the apparatus is stopped with the developer 6 almost not coming into contact with the photosensitive drum 1.
（発明の効果）
以上、実施例に基づいて説明したように、この
発明では、非現像時もしくは現像終了後にスリー
ブ周面の現像剤の穂の長さを半減させて現像剤が
感光体ドラムとほゞ無接触の状態でマグネツトロ
ール及びスリーブの回転を停止させるようにした
ため、起動時の衝撃、振動等によつて派生する現
像剤の落下、飛散等が防止可能であると同時に、
現像剤収容槽の回収開口近傍で生ずる塊集による
ブロツキング現象も防止可能である。(Effects of the Invention) As described above based on the embodiments, in this invention, the length of the ears of developer on the sleeve circumferential surface is halved during non-development or after development is completed, so that the developer can reach the photoreceptor drum. Since the rotation of the magnet roll and sleeve is stopped in an almost non-contact state, it is possible to prevent the developer from falling or scattering due to shocks and vibrations during startup, and at the same time,
It is also possible to prevent the blocking phenomenon caused by agglomerates occurring near the collection opening of the developer storage tank.
また、装置停止時には現像領域における現像剤
が半減するため、現像領域で外気に触れ湿気を吸
収して現像剤が劣化する現象、すなわち流動性低
下及び抵抗値変化をも改善する。 Furthermore, since the amount of developer in the developing area is reduced by half when the apparatus is stopped, the phenomenon of deterioration of the developer due to exposure to outside air and absorption of moisture in the developing area, ie, a decrease in fluidity and a change in resistance value, is also improved.
従つて、この発明は簡単な構成できわめて安定
した電子写真記録方式の乾式現像装置として利用
することができる。 Therefore, the present invention can be used as an extremely stable electrophotographic dry developing device with a simple configuration.
第１図はこの発明の一実施例の現像ロール周傍
の部分断面図、第２図はこの発明の現像剤の穂の
長さが均衡する一例を示す図、第３図は駆動部の
構成を示すブロツク図である。
１……感光体ドラム、２……現像ロール、２ａ
……非磁性中空スリーブ、２ｂ……永久磁石、３
……現像剤収容槽、４……ストツパ、５……開口
部、６……現像剤。
FIG. 1 is a partial cross-sectional view of the circumference of the developing roll according to an embodiment of the present invention, FIG. 2 is a diagram showing an example in which the lengths of the ears of the developer according to the present invention are balanced, and FIG. 3 is the configuration of the drive unit. FIG. 1...Photosensitive drum, 2...Developing roll, 2a
...Nonmagnetic hollow sleeve, 2b...Permanent magnet, 3
...Developer storage tank, 4...Stopper, 5...Opening, 6...Developer.
Claims (1)
ロール周面上に保持し、静電潜像担持体に摺擦し
て現像を行う電子写真記録方式の乾式現像装置に
おいて、 前記現像剤収容槽の壁面の一部にカツトアウト
部が形成され、前記現像ロールと前記現像剤収容
槽との間に前記現像ロールの軸と平行な方向に延
びる第１及び第２の開口がそれぞれ形成されるよ
うに前記現像ロールはその一部が前記カツトアウ
ト部を介して前記現像剤収容槽内に入り込むごと
く設けられ、前記第１の開口は前記現像剤を前記
現像ロール周面上に供給するための供給用開口部
をなし、前記第２の開口には前記現像ロールと圧
接するように前記現像剤収容槽に固定され、前記
現像剤の流れをせきとめて現像領域を隔成するス
トツパが設けられ、前記現像ロールは非磁性体か
らなる中空スリーブと該中空スリーブ内に設けら
れる複数極のマグネツトロールとから構成され、
前記中空スリーブと前記マグネツトロールは同一
方向に独立して回転可能であり、前記中空スリー
ブは一定速度で回転し、前記マグネツトロール
は、現像時には前記中空スリーブ周面上に形成さ
れる前記現像剤の磁気ブラシの穂の長さが均衡す
るごとき第１の回転速度で回転し、現像終了時若
しくは非現像時には前記現像剤の供給量を減少さ
せて前記現像剤が前記静電潜像担持体にほゞ摺擦
しない状態で前記磁気ブラシの穂の長さが均衡す
るごとき第２の回転速度で回転することを特徴と
する電子写真記録方式の乾式現像装置。[Scope of Claims] 1. An electrophotographic dry developing device in which developer supplied from a developer storage tank is held on the circumferential surface of a developing roll and developed by rubbing it against an electrostatic latent image carrier. A cut-out portion is formed in a part of the wall surface of the developer storage tank, and first and second openings extend in a direction parallel to the axis of the development roll between the developer roll and the developer storage tank. The developing roll is provided so that a portion of the developing roll enters the developer storage tank through the cut-out portion, and the first opening allows the developer to be deposited onto the peripheral surface of the developing roll. The second opening has a stopper fixed to the developer storage tank so as to be in pressure contact with the developer roll, and which blocks the flow of the developer and separates a development area. is provided, the developing roll is composed of a hollow sleeve made of a non-magnetic material and a multi-pole magnet roll provided within the hollow sleeve,
The hollow sleeve and the magnet roll are independently rotatable in the same direction, the hollow sleeve rotates at a constant speed, and the magnet roll rotates the developing image formed on the circumferential surface of the hollow sleeve during development. The developer rotates at a first rotational speed such that the lengths of the ears of the magnetic brush are balanced, and when development is completed or when no development is being performed, the supply amount of the developer is reduced so that the developer is applied to the electrostatic latent image carrier. An electrophotographic dry type developing device, characterized in that it rotates at a second rotational speed such that the lengths of the ears of the magnetic brush are balanced without any slight rubbing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59034382A JPS60178473A (en) | 1984-02-27 | 1984-02-27 | Dry type developing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59034382A JPS60178473A (en) | 1984-02-27 | 1984-02-27 | Dry type developing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60178473A JPS60178473A (en) | 1985-09-12 |
| JPH0452954B2 true JPH0452954B2 (en) | 1992-08-25 |
Family
ID=12412616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59034382A Granted JPS60178473A (en) | 1984-02-27 | 1984-02-27 | Dry type developing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60178473A (en) |
-
1984
- 1984-02-27 JP JP59034382A patent/JPS60178473A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60178473A (en) | 1985-09-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |