JPH10293445A - Developing device - Google Patents

Developing device

Info

Publication number
JPH10293445A
JPH10293445A JP10207197A JP10207197A JPH10293445A JP H10293445 A JPH10293445 A JP H10293445A JP 10207197 A JP10207197 A JP 10207197A JP 10207197 A JP10207197 A JP 10207197A JP H10293445 A JPH10293445 A JP H10293445A
Authority
JP
Japan
Prior art keywords
sheet
toner
developing device
members
groove
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
Application number
JP10207197A
Other languages
Japanese (ja)
Inventor
Hideaki Kawai
秀明 河合
Masahiro Fujimaru
政広 藤丸
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.)
Murata Machinery Ltd
Original Assignee
Murata Machinery 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 Murata Machinery Ltd filed Critical Murata Machinery Ltd
Priority to JP10207197A priority Critical patent/JPH10293445A/en
Publication of JPH10293445A publication Critical patent/JPH10293445A/en
Pending legal-status Critical Current

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  • Dry Development In Electrophotography (AREA)

Abstract

PROBLEM TO BE SOLVED: To effectively and surely remove toner by removing the toner adhering to the inner wall of the side surface of a recessed groove by a sheet-like member disposed backward further even when the toner is not perfectly removed by a sheet-like member positioned foremost in a rotating direction. SOLUTION: A cleaning body 57 cleaning a toner residual amount detection part 56 is provided in a stirring body 44 for the toner 40 disposed in the main body 41 of the developing device 4, and it is constituted by laminating plural sheet-like members 54 and 55. The respective members 54 and 55 of the cleaning body 57 are constituted to be in a non-fixed state at a part where they come into contact with the part to be cleaned 56b of the detection part 56.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、電子写真式画像記
録装置に用いられる現像器であって、さらに詳しくは、
トナーの残量検出部を清掃する清掃体を備えた現像器に
関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing device for use in an electrophotographic image recording apparatus.
The present invention relates to a developing device provided with a cleaning body for cleaning a toner remaining amount detecting unit.

【0002】[0002]

【従来の技術】従来から、電子写真方式を用いた画像記
録装置の現像器においては、トナーを貯留する本体内に
トナー残量検出部を設けて、トナー残量の有無を検出し
ていた。このトナー残量検出部にはトナーが付着し易
く、トナーが付着するとトナー残量の検出が正確に行な
えなくなるため、トナー残量検出部を常に清浄に保って
おく必要がある。そこで、現像装置の本体内に配設した
トナーの攪拌体に可撓性を有したシート状部材を取付
け、該シート状部材を攪拌体と共に回転させることによ
りトナー残量検出部を清掃する機構を設けて、トナーの
残量検出部を清掃していた。
2. Description of the Related Art Conventionally, in a developing device of an image recording apparatus using an electrophotographic system, a toner remaining amount detecting section is provided in a main body for storing toner to detect the presence or absence of a toner remaining amount. The toner easily adheres to the toner remaining amount detecting unit, and if the toner adheres, the remaining toner amount cannot be detected accurately. Therefore, it is necessary to always keep the toner remaining amount detecting unit clean. Therefore, a mechanism for attaching a flexible sheet-like member to a toner agitator disposed in the main body of the developing device and rotating the sheet-like member together with the agitator to clean the toner remaining amount detecting unit is provided. And the toner remaining amount detection unit is cleaned.

【0003】[0003]

【発明が解決しようとする課題】しかし、前述のような
清掃機構においても、トナー残量検出部の清掃を充分に
行なって常に清浄に保っておくことは困難であり、トナ
ー有無の判断が正常に行なわれない場合があった。
However, even in the above-described cleaning mechanism, it is difficult to sufficiently clean the toner remaining amount detecting section and keep it always clean. Was not performed in some cases.

【0004】[0004]

【課題を解決するための手段】本発明は、現像器におけ
る以上のような課題を解決すべく、次のような手段を用
いるものである。即ち、現像器の本体内に配設したトナ
ーの攪拌体にトナー残量検出部を清掃するための清掃体
を設け、該清掃体は複数のシート状部材を積層して構成
し、清掃体の各々のシート状部材を、該シート状部材が
トナー残量検出部の被清掃部分と接する部位においては
互いに非固着状態に構成する。
The present invention uses the following means to solve the above-mentioned problems in the developing device. That is, a cleaning member for cleaning the toner remaining amount detection unit is provided on a stirring member of the toner disposed in the main body of the developing device, and the cleaning member is configured by stacking a plurality of sheet-shaped members. The respective sheet-shaped members are configured so as not to be fixed to each other at a portion where the sheet-shaped members are in contact with the portion to be cleaned of the toner remaining amount detecting unit.

【0005】また、現像器の本体内の底部側壁に攪拌体
の回転軌跡と同心円弧状に形成した凹溝を設けて、該凹
溝の両側壁を透明部材にて構成し、凹溝の両側壁外側に
それぞれ光透過型センサの発光部と受光部とを配設し
て、前記清掃体が攪拌体の回転に伴って凹溝両側壁内面
に摺接しながら該凹溝内を通過するよう構成する。
Further, a concave groove formed concentrically with the rotation locus of the stirrer is provided on a bottom side wall in the main body of the developing device, and both side walls of the concave groove are formed of transparent members, and both side walls of the concave groove are formed. The light emitting unit and the light receiving unit of the light transmission type sensor are disposed on the outside, respectively, and the cleaning body is configured to pass through the concave groove while slidingly contacting the inner surfaces of both side walls of the concave groove with the rotation of the stirrer. .

【0006】また、前記の現像器において、前記清掃体
を二枚のシート状部材で構成し、回転方向に対して前方
に位置するシート状部材を前記凹溝幅と略同一幅に形成
し、後方に位置するシート状部材を凹溝幅よりも若干大
きく形成して、両シート状部材は幅方向の中央部で固着
する。
In the above-mentioned developing device, the cleaning body is constituted by two sheet-like members, and the sheet-like member located forward in the rotational direction is formed to have substantially the same width as the width of the groove. The sheet member located rearward is formed to be slightly larger than the width of the groove, and both sheet members are fixed at the center in the width direction.

【0007】[0007]

【発明の実施の形態】本発明の実施の形態を、添付の図
面より説明する。図1は本発明の現像器を備えた、電子
写真式画像記録装置の内部を示す側面断面図、図2は現
像器ユニット及びドラムユニットを示す側面断面図、図
3は清掃体を取付けた攪拌体を示す斜視図、図4は現像
器の本体に形成した凹溝を示す斜視図、図5は凹溝と清
掃体との関係を示す断面図である。
Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side sectional view showing the inside of an electrophotographic image recording apparatus provided with a developing device of the present invention, FIG. 2 is a side sectional view showing a developing unit and a drum unit, and FIG. FIG. 4 is a perspective view showing a groove formed in the main body of the developing device, and FIG. 5 is a sectional view showing a relationship between the groove and the cleaning body.

【0008】まず、本発明の現像器を備えた電子写真式
画像記録装置概略構成について、図1乃至図3により説
明する。プロセスユニットPUが、画像記録装置Pの上
部に配設され、ドラムユニット10と現像器ユニット4
などとから成っている。ドラムユニット10内には、感
光体ドラム1が配設され、該感光体ドラム1の周囲にそ
の回転方向(矢視A)に沿って帯電器2、光書き込みユ
ニット(LEDヘッドアレイ)3、現像器ユニット4、
転写器5、メモリ除去部材51、絶縁性部材52が順に
配設されている。
First, a schematic configuration of an electrophotographic image recording apparatus provided with a developing device of the present invention will be described with reference to FIGS. A process unit PU is disposed above the image recording apparatus P, and includes a drum unit 10 and a developing unit 4.
And so on. A photosensitive drum 1 is disposed in the drum unit 10, and a charger 2, an optical writing unit (LED head array) 3, and a developing device are provided around the photosensitive drum 1 along the rotation direction (arrow A). Unit 4,
A transfer unit 5, a memory removing member 51, and an insulating member 52 are sequentially provided.

【0009】感光体ドラム1と帯電器2とメモリ除去部
材51と絶縁性部材52とはドラムユニット10として
ユニット化され、ドラムユニット10の感光体ドラム1
の軸1aを現像器ユニット4に着脱自在に係合させてい
る。そして、このプロセスユニットPUは本体フレーム
21に着脱自在に設置され、ドラムユニット10と現像
器ユニット4とを一体的に、またドラムユニット10の
みを本体フレーム21上方に取り外し可能としている。
このように構成することで、プロセスユニットPU内で
用紙詰まりなどが発生した際に、容易に該用紙を取り出
せるようにしている。
The photosensitive drum 1, the charger 2, the memory removing member 51 and the insulating member 52 are unitized as a drum unit 10, and the photosensitive drum 1 of the drum unit 10
The shaft 1a is detachably engaged with the developing unit 4. The process unit PU is detachably mounted on the main body frame 21 so that the drum unit 10 and the developing unit 4 can be integrated with each other, and only the drum unit 10 can be removed above the main body frame 21.
With this configuration, when a paper jam occurs in the process unit PU, the paper can be easily taken out.

【0010】ドラムユニット10の下流側には、用紙に
転写されたトナー像を定着するための定着ユニット6が
配設され、該定着ユニット6は互いに圧接された加熱ロ
ーラ61と加圧ローラ62とで構成されている。ドラム
ユニット10の上流側には、用紙搬送ローラ71・72
・72’、ピックアップローラ73・73’、及び給紙
カセット74・74’から構成される記録用紙供給・搬
送系7が設けられている。前記帯電器2は、ローラ表面
を導電性繊維ブラシで覆ったブラシローラ式帯電器であ
り、該帯電器2にはバイアス電圧が印加され、回転しな
がら感光体ドラム1の周面を均一に、略−750Vに帯
電する。転写器5は、ウレタン樹脂などから成る導電性
発泡体で構成され、該転写器5には定電流のバイアス電
圧(例えば500V〜2KV)が印加される。
A fixing unit 6 for fixing the toner image transferred to the sheet is disposed downstream of the drum unit 10. The fixing unit 6 includes a heating roller 61 and a pressure roller 62 pressed against each other. It is configured. On the upstream side of the drum unit 10, sheet transport rollers 71 and 72 are provided.
A recording paper supply / conveyance system 7 including a 72 ′, pickup rollers 73/73 ′, and paper feed cassettes 74/74 ′ is provided. The charger 2 is a brush roller type charger in which a roller surface is covered with a conductive fiber brush, and a bias voltage is applied to the charger 2 to uniformly rotate the peripheral surface of the photosensitive drum 1 while rotating. It is charged to approximately -750V. The transfer unit 5 is formed of a conductive foam made of urethane resin or the like, and a constant current bias voltage (for example, 500 V to 2 KV) is applied to the transfer unit 5.

【0011】前記現像ユニット4は、トナー40を貯留
する現像器本体41と、該現像器本体41の下部に配置
した供給ローラ42と、該供給ローラ42感光体ドラム
1との間に配設して互いに転接するよう位置させた現像
ローラ43と、現像器本体41内に配設して貯留された
トナー40を攪拌する攪拌体44と、前記現像ローラ4
3のトナー40の搬送方向の下流側周面に弾設されたト
ナー規制用ブレード45とから成っている。
The developing unit 4 is provided between a developing device main body 41 for storing the toner 40, a supply roller 42 disposed below the developing device main body 41, and the supply roller 42 and the photosensitive drum 1. A developing roller 43 positioned so as to be in contact with each other, a stirring member 44 disposed in the developing device main body 41 to stir the stored toner 40,
And a toner regulating blade 45 elastically provided on the downstream peripheral surface of the third toner 40 in the conveying direction.

【0012】現像ローラ43は、ステンレスなどの金属
で形成された軸43aの周面に、導電性を有したブタジ
エンアクリロニトリルゴム(以降NBRと記す)層43
bを被覆して構成し、該NBR層43bの表面は、平滑
に仕上げされている。該軸43aは矢視B方向に回転
し、該現像ローラ43にはバイアス電圧(例えば−30
0V〜−400V、好ましくは−350V)が印加され
る。尚、前記NBR層43bは、NBRに代えて、導電
性のシリコンゴムやウレタンゴムなどを使用してもよ
い。また、前記トナー規制用ブレード45は、弾性を有
する導電性の樹脂シートからなり、該トナー規制用ブレ
ード45には、バイアス電圧(例えば−600V〜−7
00V、好ましくは−650V前後)が印加される。供
給ローラ42は、ステンレスなどの金属で形成された軸
42aの周面に、導電性を有した発泡体、例えば発泡ウ
レタンなどから成る発泡体層42bを被覆して構成して
いる。該軸42aは矢視C方向に回転し、該供給ローラ
42にはバイアス電圧(例えば−600V〜−700
V、好ましくは−650V前後)が印加される。
The developing roller 43 has a conductive butadiene acrylonitrile rubber (hereinafter referred to as NBR) layer 43 on a shaft 43a made of metal such as stainless steel.
b, and the surface of the NBR layer 43b is smoothed. The shaft 43a rotates in the arrow B direction, and a bias voltage (for example, −30) is applied to the developing roller 43.
0 V to -400 V, preferably -350 V). The NBR layer 43b may be made of conductive silicon rubber or urethane rubber instead of NBR. Further, the toner regulating blade 45 is made of an elastic conductive resin sheet, and a bias voltage (for example, −600 V to −7 V) is applied to the toner regulating blade 45.
00V, preferably around -650 V). The supply roller 42 includes a shaft 42a formed of a metal such as stainless steel, and a peripheral surface thereof covered with a foam layer 42b made of a conductive foam, for example, urethane foam. The shaft 42a rotates in the arrow C direction, and a bias voltage (for example, -600V to -700V) is applied to the supply roller 42.
V, preferably around -650 V).

【0013】供給ローラ42と現像ローラ43との軸心
間距離は、それぞれのローラ半径の合計よりも若干小さ
く設定されており、これにより両ローラの当接部は圧接
関係となる。この圧接関係及び前記矢視B・Cの回転方
向によるローラ42と現像ローラ43との摩擦作用と、
各ローラ42・43に印加されたバイアス電圧とが相ま
って、該両ローラ42・43付近に存在するトナー40
が帯電する。そして、供給ローラ42の矢視C方向への
回転により発泡体層42bの気泡内に充填されたトナー
40が、現像ローラ43側に移送され、供給ローラ42
と現像ローラ43との圧接部では両ローラ42・43の
電位差により、該トナー40が現像ローラ43の表面に
付着する。現像ローラ43の表面に付着したトナー40
は、該現像ローラ43の矢視B方向への回転により、感
光体ドラム1側へ搬送される。その途中、略−650V
に印加されたトナー規制用ブレード45により、現像ロ
ーラ43の表面に付着したトナー40の層厚は均一にな
る。
The distance between the axes of the supply roller 42 and the developing roller 43 is set slightly smaller than the sum of the respective roller radii, so that the abutting portions of the two rollers are in a pressure contact relationship. The frictional action between the roller 42 and the developing roller 43 due to this pressure contact relationship and the rotation directions of the arrows B and C;
The bias voltage applied to each of the rollers 42 and 43 is combined with the toner 40 existing near the rollers 42 and 43.
Is charged. Then, by the rotation of the supply roller 42 in the arrow C direction, the toner 40 filled in the bubbles of the foam layer 42 b is transferred to the developing roller 43 side, and the supply roller 42
The toner 40 adheres to the surface of the developing roller 43 due to a potential difference between the two rollers 42 and 43 at the pressure contact portion between the developing roller 43 and the developing roller 43. Toner 40 attached to the surface of developing roller 43
Is transported toward the photosensitive drum 1 by the rotation of the developing roller 43 in the direction of arrow B. On the way, approximately -650V
The layer thickness of the toner 40 attached to the surface of the developing roller 43 is made uniform by the toner regulating blade 45 applied to the developing roller 43.

【0014】次に、現像器4におけるトナーの残量検出
機構について図2乃至図5により説明する。現像器4の
本体41内には攪拌体44が配設され、該攪拌体44
は、回転軸44aを中心にして図2に示す矢視D方向に
回転している。この攪拌体44の回転によって、本体4
1内に貯留されたトナー40が常時攪拌されているので
ある。
Next, a mechanism for detecting the remaining amount of toner in the developing device 4 will be described with reference to FIGS. A stirring body 44 is provided in the main body 41 of the developing device 4.
Are rotated in the direction of arrow D shown in FIG. The rotation of the stirring body 44 causes the main body 4 to rotate.
The toner 40 stored in the toner cartridge 1 is constantly stirred.

【0015】該攪拌体44には、シート状に形成した二
枚のシート状部材54・55を取付け、該シート状部材
54・55で清掃体57を形成している。シート状部材
54・55は、合成ゴムなどの可撓性を有した部材によ
って形成され、該シート状部材54・55は、回転軸4
4aから回転半径方向外側へ向かって突設され、シート
面が回転軸と平行になるよう配設されている。尚、シー
ト状部材54・55は、同一材質の部材で形成してコス
ト安にしているが、お互いに異なった材質の部材で形成
することを妨げるものではない。
The stirring member 44 has two sheet members 54 and 55 formed in a sheet shape, and a cleaning member 57 is formed by the sheet members 54 and 55. The sheet members 54 and 55 are formed of a flexible member such as synthetic rubber, and the sheet members 54 and 55 are
4a, it is provided so as to protrude outward in the rotation radial direction, and is disposed so that the seat surface is parallel to the rotation axis. Although the sheet members 54 and 55 are formed of members of the same material to reduce the cost, the sheet members 54 and 55 do not prevent the members from being formed of members of different materials.

【0016】シート状部材54はシート状部材55より
も回転方向に対する前側に配置され、シート状部材54
とシート状部材55とは積層して取付けられている。ま
た、該シート状部材55は、回転軸44a方向において
シート状部材54よりも幅広に形成され、該シート状部
材54・55は回転軸44a方向における中央部で固定
具44bによって固定されている。尚、回転軸44a方
向におけるシート状部材54・55の端部54aと端部
55aとは固着されておらず、互いに自由に接したり離
れたりできるように構成している。
The sheet-like member 54 is disposed on the front side in the rotation direction with respect to the sheet-like member 55, and the sheet-like member 54
And the sheet-like member 55 are laminated and attached. Further, the sheet-like member 55 is formed wider than the sheet-like member 54 in the direction of the rotation shaft 44a, and the sheet-like members 54 and 55 are fixed by a fixing tool 44b at a central portion in the direction of the rotation shaft 44a. Note that the ends 54a and 55a of the sheet members 54 and 55 in the direction of the rotation shaft 44a are not fixed, and are configured to be able to freely contact and separate from each other.

【0017】一方、攪拌体44の底部側壁には、トナー
残量検出用部材56が設けられ、該トナー残量検出用部
材56内側には、攪拌体44の回転軌跡と同心円弧状に
形成した凹溝56aが形成されている。該凹溝56aの
両側面56b・56bは透明部材によって構成されてい
る。また、凹溝56aは前記清掃体57に位置を合わせ
て配設され、図5に示すように該清掃体57が先端から
凹溝56aに嵌入している。シート状部材54は、回転
軸44a方向の幅寸法を凹溝56aと略同じに形成し
て、該シート状部材54の前記端部54a・54aは凹
溝56aの両側面56b・56bの内壁と摺接してい
る。そして、シート状部材55は、回転軸44a方向の
幅寸法を凹溝56aよりも若干大きく形成して、該シー
ト状部材55の前記端部55a・55aは回転方向に対
して後方に屈曲しながら、凹溝56aの両側面56b・
56bの内壁と摺接しており、シート状部材54よりも
大きな圧力をもって側面56b・56bの内壁と接して
いる。
On the other hand, a toner remaining amount detecting member 56 is provided on the bottom side wall of the stirring body 44. Inside the toner remaining amount detecting member 56, a concave portion formed concentrically with the rotation locus of the stirring body 44 is formed. A groove 56a is formed. Both side surfaces 56b of the concave groove 56a are made of a transparent member. Further, the concave groove 56a is disposed so as to be aligned with the cleaning body 57, and the cleaning body 57 is fitted into the concave groove 56a from the tip as shown in FIG. The sheet-like member 54 is formed so that the width dimension in the direction of the rotating shaft 44a is substantially the same as that of the concave groove 56a, and the end portions 54a of the sheet-like member 54 are in contact with the inner walls of both side surfaces 56b 56b of the concave groove 56a. Is in sliding contact. The sheet member 55 has a width in the direction of the rotation shaft 44a slightly larger than the groove 56a, and the ends 55a of the sheet member 55 are bent rearward in the rotation direction. , Both side surfaces 56b of the concave groove 56a.
It is in sliding contact with the inner wall of 56b, and is in contact with the inner walls of the side surfaces 56b with greater pressure than the sheet-like member 54.

【0018】また、凹溝56aの両側面56b・56b
の外側には、一方に光透過型センサ58の発光部58a
を、他方には受光部58bを配設して、該発光部58a
から発せられた光が、凹溝56aの両側面56b・56
bを通過して受光部58bで受光されるように構成して
いる。そして、発光部58aから発せられた光が受光部
58bで受光された場合にはトナー無しと判定して、発
光部58aから発せられた光が受光部58bで受光され
ない場合にはトナー有りと判定するように画像記録装置
内に判定回路を設けている。
Also, both side surfaces 56b, 56b of the concave groove 56a
Outside, one side of the light emitting portion 58a of the light transmission type sensor 58
And a light receiving section 58b is provided on the other side, and the light emitting section 58a
The light emitted from both sides 56b and 56 of the concave groove 56a
b so that the light is received by the light receiving unit 58b. If the light emitted from the light emitting unit 58a is received by the light receiving unit 58b, it is determined that there is no toner. If the light emitted from the light emitting unit 58a is not received by the light receiving unit 58b, it is determined that there is toner. A determination circuit is provided in the image recording apparatus so as to perform the determination.

【0019】以上のように構成したトナーの残量検出機
構によって、トナー40の有無が次のように検出され
る。本体41内では攪拌体44と一体的に清掃体57が
回転しており、一定間隔毎に凹溝56a内を通過して、
例えば本体41内にトナー40が貯留されている場合
は、凹溝56a内に充填されたトナー40を該凹溝56
aから掻き出す。また、凹溝56aの両側面56b・5
6bに付着したトナー40は、該両側面56b・56b
に圧接したシート状部材54・55の端部54a・55
aが凹溝56a内を摺動することによって取り除かれ
て、両側面56b・56bは清掃される。
The presence / absence of the toner 40 is detected by the toner remaining amount detecting mechanism configured as described above as follows. In the main body 41, the cleaning body 57 rotates integrally with the stirring body 44, passes through the concave groove 56a at regular intervals,
For example, when the toner 40 is stored in the main body 41, the toner 40 filled in the concave groove 56a is
scrape from a. Also, both side surfaces 56b / 5 of the concave groove 56a
6b, the toner 40 adhered to both side surfaces 56b
54a, 55 of sheet members 54, 55 pressed against
a is removed by sliding in the groove 56a, and both side surfaces 56b are cleaned.

【0020】そして、本体41内にトナー40が貯留さ
れている場合は、清掃体57が通過して側面56b・5
6bを清掃した後に、すぐさま凹溝56a内にトナー4
0が侵入して充填されるので、発光部58aから発せら
れた光はトナー40により遮られて受光部58bまで到
達せず、その結果判定回路によってトナー有りと判定さ
れる。
When the toner 40 is stored in the main body 41, the cleaning body 57 passes and the side surfaces 56b and 5
6b, the toner 4 is immediately placed in the groove 56a.
Since 0 is penetrated and filled, the light emitted from the light emitting unit 58a is blocked by the toner 40 and does not reach the light receiving unit 58b, and as a result, the presence of toner is determined by the determination circuit.

【0021】逆に、現像器4の本体41内にトナー40
が貯留されていない場合、若しくは殆ど貯留されていな
い場合には、清掃体57により清掃される前の凹溝56
aの両側面56b・56b内壁にはトナー40が付着し
ており、光透過型センサ58の発光部58aから発せら
れた光の一部しか受光部58bへ到達しなかったり、と
きには全く到達しなかったりする。この状態において、
前記清掃体57が凹溝56a内を通過すると、側面56
b・56b内壁に付着したトナー40がシート状部材5
4・55によって取り除かれ、その後も凹溝56a内に
トナー40が充填されることはない。この場合、回転方
向に対して前方に位置しているシート状部材54によっ
て、側面56b・56b内壁に付着したトナー40が取
り除かれるが、仮に付着したトナー40の全てが取り除
かれなかったとしても、シート状部材54の後方に配設
したシート状部材55により、より確実にトナー40が
除去されて、付着したトナー40は完全に取り除かれる
のである。その結果、発光部58aからの光は、その殆
どが受光部58bへ到達することとなって、判定回路に
よってトナー無しと判定されるのである。
Conversely, the toner 40 is contained in the main body 41 of the developing device 4.
Is not stored, or is almost not stored, the groove 56 before being cleaned by the cleaning body 57.
The toner 40 adheres to both side surfaces 56b and the inner walls of 56b, and only a part of the light emitted from the light emitting portion 58a of the light transmitting sensor 58 reaches the light receiving portion 58b or sometimes does not reach at all. Or In this state,
When the cleaning body 57 passes through the concave groove 56a, the side surface 56
The toner 40 adhered to the inner wall of the sheet member 56
4 and 55, the toner 40 is not filled in the groove 56a thereafter. In this case, although the toner 40 attached to the side walls 56b and the inner wall of the side 56b is removed by the sheet-shaped member 54 positioned forward with respect to the rotation direction, even if all of the attached toner 40 is not removed, The toner 40 is more reliably removed by the sheet-like member 55 disposed behind the sheet-like member 54, and the attached toner 40 is completely removed. As a result, most of the light from the light emitting section 58a reaches the light receiving section 58b, and the determination circuit determines that there is no toner.

【0022】シート状部材55はシート状部材54より
も幅広に形成されているので、凹溝56aの側面56b
・56b内壁との圧接力がシート状部材54の場合より
も大きく、側面56b・56b内壁に付着したトナー4
0の除去能力が高くなっている。また、シート状部材5
4とシート状部材55とは、回転軸44a方向における
中央部のみで固着されているので、その端部54aと5
5aとは互いに自由に接したり離れたりすることがで
き、シート状部材55はトナー40を除去するための最
適な形状をとることができる。これにより、側面56b
・56b内壁に付着したトナー40を完全に除去するこ
とができるのである。尚、トナー有無の判定基準は、発
光部58aからの光の受光部58bへの到達割合を適宜
設定することで、任意に決定することができる。
Since the sheet member 55 is formed wider than the sheet member 54, the side surface 56b of the concave groove 56a is formed.
The pressing force against the inner wall of the sheet 56b is larger than that of the sheet member 54, and the toner 4 adhering to the inner wall of the side face 56b
The removal ability of 0 is high. Further, the sheet-like member 5
4 and the sheet-like member 55 are fixed only at the central portion in the direction of the rotation shaft 44a, so that the end portions 54a and 5
5a can freely contact and separate from each other, and the sheet-like member 55 can take an optimal shape for removing the toner 40. Thereby, the side surface 56b
-The toner 40 attached to the inner wall of the 56b can be completely removed. Note that the criterion for determining the presence or absence of the toner can be arbitrarily determined by appropriately setting the ratio of the light from the light emitting unit 58a to the light receiving unit 58b.

【0023】次に、以上のように構成した画像記録装置
における画像形成プロセスについて簡単に説明する。感
光体ドラム1が矢視A方向に回転し、帯電器2により該
感光体ドラム1の表面が略−750Vに均一に帯電され
る。帯電器2は導電性繊維ブラシ2bにより構成してい
るので帯電の均一性に優れており、オゾンの発生がな
い。その後、LEDヘッドアレイにて構成された光書き
込みユニット3により画情報に基づいて感光体ドラム1
の表面に光照射が行なわれる。感光体ドラム1はアース
された光導電体より成るので、光が照射された部位、即
ち画情報の黒に対応する部分の電位が−50V程度にな
り、光の照射部位と非照射部位(画情報の白に対応する
部分)とに電位差が生じ、これにより感光体ドラム1の
光書き込みユニット3下流側表面には画情報に対応する
静電潜像が形成される。
Next, an image forming process in the image recording apparatus configured as described above will be briefly described. The photoreceptor drum 1 rotates in the direction of arrow A, and the surface of the photoreceptor drum 1 is uniformly charged to about -750 V by the charger 2. Since the charger 2 is constituted by the conductive fiber brush 2b, the charger 2 is excellent in charging uniformity and does not generate ozone. Thereafter, the photosensitive drum 1 is formed based on the image information by the optical writing unit 3 constituted by an LED head array.
Is irradiated with light. Since the photosensitive drum 1 is made of a grounded photoconductor, the potential of a portion irradiated with light, that is, a portion corresponding to black of image information becomes about -50 V, and a portion irradiated with light and a non-irradiated portion (image). (A portion corresponding to white of information), and an electrostatic latent image corresponding to image information is formed on the surface of the photosensitive drum 1 on the downstream side of the optical writing unit 3.

【0024】この静電潜像が現像器4に至り、該静電潜
像と現像ローラ43の表面に付着して略−650Vに帯
電したトナー40とが接すると、該トナー40は光の照
射部位との電位差によって感光体ドラム1表面の光照射
部位に吸引されて、感光体ドラム1表面にはトナー像が
形成される。このトナー像は感光体ドラム1の回転によ
り該感光体ドラム1と転写器5との転接部に達するが、
この転接部には、感光体ドラム1の回転に同期して、前
記ピックアップローラ73により給紙カセット74(7
4’)から一枚ずづ繰り出された記録用紙が、搬送ロー
ラ72(72’)・71を経て導入される。転写器5に
は500V〜2KVのバイアス電圧が印加されているか
ら、感光体ドラム1表面のトナー像は転写器5に吸引さ
れて記録用紙に付着して転写される。トナー像が転写さ
れた記録用紙は、感光体ドラム1及び転写器5の回転に
よりさらに搬送され、定着ユニット6に至る。
When the electrostatic latent image reaches the developing device 4 and the electrostatic latent image contacts the toner 40 charged on the surface of the developing roller 43 and charged to approximately -650 V, the toner 40 is irradiated with light. The toner is attracted to the light-irradiated portion on the surface of the photosensitive drum 1 by a potential difference from the portion, and a toner image is formed on the surface of the photosensitive drum 1. This toner image reaches the rolling contact portion between the photosensitive drum 1 and the transfer device 5 by the rotation of the photosensitive drum 1,
In synchronization with the rotation of the photosensitive drum 1, the paper feed cassette 74 (7
The recording paper fed out one by one from 4 ′) is introduced through transport rollers 72 (72 ′) and 71. Since a bias voltage of 500 V to 2 KV is applied to the transfer unit 5, the toner image on the surface of the photosensitive drum 1 is sucked by the transfer unit 5 and adheres to the recording paper and is transferred. The recording paper onto which the toner image has been transferred is further conveyed by the rotation of the photosensitive drum 1 and the transfer device 5 and reaches the fixing unit 6.

【0025】定着ユニット6に至った記録用紙は、加熱
ローラ61と加圧ローラ62との圧接部に導入される。
ここで、トナー40に含まれる樹脂成分が、両ローラ6
1・62の加熱・加圧作用によって溶融し、用紙に融着
して永久像が形成されて、装置外に記録用紙が排出され
る。トナー像が記録用紙に転写された後の感光体ドラム
1表面は、転写器5の作用によりプラス帯電されるとと
もに、若干の未転写トナーが残る。感光体ドラム1はそ
の後も回転を続けて、帯電器2により前記の如くその表
面が均一に帯電され、その後のプロセスが繰り返され
る。
The recording paper that has reached the fixing unit 6 is introduced into a pressure contact portion between the heating roller 61 and the pressure roller 62.
Here, the resin component contained in the toner 40 is
The recording sheet is melted by the heating / pressing action of 1.62 and fused to the sheet to form a permanent image, and the recording sheet is discharged out of the apparatus. After the transfer of the toner image onto the recording paper, the surface of the photosensitive drum 1 is positively charged by the operation of the transfer device 5, and a small amount of untransferred toner remains. The photoreceptor drum 1 continues to rotate thereafter, the surface thereof is uniformly charged by the charger 2 as described above, and the subsequent process is repeated.

【0026】一方、感光体ドラム1表面に残った未転写
トナーは、帯電器2とは別に設けたメモリ除去部材51
に電圧を印加することで、該メモリ除去部材51の作用
によりかき乱されて該感光体ドラム1表面で分散される
とともに、帯電される。この場合、メモリ除去部材51
と帯電器2との間には絶縁性部材52を介装しているの
で、両者間が接近した場合でも画像形成に障害を生じさ
せることはない。そして、感光体ドラム1表面に残存し
たトナーは分散されるので、光書き込みユニット3によ
る光照射に影響を及ぼさず、画像形成の障害になること
はない。この分散された残存トナーは、現像器ユニット
4に至り、現像ローラ43との電位差により不用なトナ
ーは吸引されて、現像器本体41内に回収される。
On the other hand, untransferred toner remaining on the surface of the photosensitive drum 1 is removed from a memory removing member 51 provided separately from the charger 2.
When the voltage is applied to the photosensitive drum 1, it is disturbed by the action of the memory removing member 51 and is dispersed and charged on the surface of the photosensitive drum 1. In this case, the memory removing member 51
Since the insulating member 52 is interposed between the charging device 2 and the charging device 2, even when the two devices approach each other, no trouble occurs in image formation. Since the toner remaining on the surface of the photosensitive drum 1 is dispersed, it does not affect the light irradiation by the optical writing unit 3 and does not hinder image formation. The dispersed residual toner reaches the developing unit 4, and the unnecessary toner is sucked by the potential difference with the developing roller 43 and is collected in the developing unit main body 41.

【0027】そして、現像器本体41内では、攪拌体4
4の回転によりトナー40が常に攪拌されており、この
回転に伴って清掃体57が回転して、トナー残量検出用
部材56を清掃するとともに、トナー40の有無を光透
過型センサー58によって検知しているのである。
In the developing device main body 41, the stirring member 4
The toner 40 is constantly agitated by the rotation of the rotation 4, and the cleaning body 57 rotates with this rotation to clean the toner remaining amount detecting member 56, and the presence or absence of the toner 40 is detected by the light transmission type sensor 58. It is doing.

【0028】[0028]

【発明の効果】本発明は、現像器において、以上のよう
な構成とすることで、次のような効果を奏する。まず、
請求項1の如く、清掃体を複数のシート状部材を積層し
て構成し、清掃体の各々のシート状部材を、該シート状
部材がトナー残量検出部の被清掃部分と接する部位にお
いては互いに非固着状態に構成したので、回転方向に対
する最前方に位置するシート状部材によって、凹溝の側
面内壁に付着したトナーが完全に取り除かれなかったと
しても、後方に配設したシート状部材によりさらに除去
することができるので、トナーの除去を効果的に、また
確実に、行なうことができた。
According to the present invention, the following effects can be obtained by employing the above configuration in the developing device. First,
As described in claim 1, the cleaning body is configured by laminating a plurality of sheet-like members, and each sheet-like member of the cleaning body is provided at a portion where the sheet-like member contacts a portion to be cleaned of the toner remaining amount detecting unit. Since they are not fixed to each other, even if the toner attached to the inner surface of the side surface of the concave groove is not completely removed by the sheet-shaped member located at the forefront with respect to the rotation direction, the sheet-shaped member provided at the rear will Since the toner can be further removed, the toner can be effectively and reliably removed.

【0029】更に、請求項2の如く、現像器の本体内の
底部側壁に両側壁を透明部材にて構成した凹溝を設け
て、凹溝の両側壁外側にそれぞれ光透過型センサの発光
部と受光部とを配設して、前記清掃体が攪拌体の回転に
伴って凹溝両側壁内面に摺接しながら該凹溝内を通過す
るよう構成したので、トナー残量検出部である凹溝両側
壁内面が、攪拌体が回転することで該攪拌体に取付けた
清掃体によって常に清浄化されて、トナー有無の判定が
正確に行なえるようになった。
Further, a groove having transparent members on both side walls is provided on the bottom side wall in the main body of the developing device, and the light emitting portions of the light transmission type sensor are provided outside the both side walls of the groove. And a light receiving unit, the cleaning body is configured to pass through the inside of the concave groove while slidingly contacting the inner surfaces of both side walls of the concave groove with the rotation of the stirrer. By rotating the stirrer, the inner surfaces of both side walls of the groove are always cleaned by the cleaner attached to the stirrer, so that it is possible to accurately determine the presence or absence of toner.

【0030】更に、請求項3の如く、前記清掃体を二枚
のシート状部材で構成し、回転方向に対して前方に位置
するシート状部材を前記凹溝幅と略同一幅に形成し、後
方に位置するシート状部材を凹溝幅よりも若干大きく形
成して、両シート状部材は幅方向の中央部で固着したの
で、後方のシート状部材の側面内壁に付着したトナーの
除去能力が高くなり、また、前方のシート状部材と後方
のシート状部材との端部は互いに自由に接したり離れた
りすることができて、後方のシート状部材はトナーを除
去するための最適な形状をとることができるので、前方
のシート状部材で除去できなかったトナーを後方のシー
ト状部材で確実に除去できて、その結果トナー有無の判
定が正確に行なえるようになった。
Further, the cleaning body is constituted by two sheet-like members, and the sheet-like member located forward in the rotation direction is formed to have substantially the same width as the groove width. The sheet member located at the rear is formed slightly larger than the width of the groove, and both sheet members are fixed at the center in the width direction, so the ability to remove toner adhered to the inner side wall of the rear sheet member is improved. And the ends of the front sheet member and the rear sheet member can freely contact and separate from each other, and the rear sheet member has an optimal shape for removing toner. As a result, the toner that could not be removed by the front sheet member can be reliably removed by the rear sheet member, and as a result, the presence or absence of the toner can be accurately determined.

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

【図1】本発明の現像器を備えた、電子写真式画像記録
装置の内部を示す側面断面図である。
FIG. 1 is a side sectional view showing the inside of an electrophotographic image recording apparatus provided with a developing device of the present invention.

【図2】現像器ユニット及びドラムユニットを示す側面
断面図である。
FIG. 2 is a side sectional view showing a developing unit and a drum unit.

【図3】清掃体を取付けた攪拌体を示す斜視図である。FIG. 3 is a perspective view showing a stirring body to which a cleaning body is attached.

【図4】現像器の本体に形成した凹溝を示す斜視図であ
る。
FIG. 4 is a perspective view showing a concave groove formed in a main body of the developing device.

【図5】凹溝と清掃体との関係を示す断面図である。FIG. 5 is a cross-sectional view illustrating a relationship between a concave groove and a cleaning body.

【符号の説明】[Explanation of symbols]

P 画像記録装置 PU プロセスユニット 1 感光体ドラム 2 帯電器 3 光書き込みユニット 4 現像器ユニット 5 転写器 10 ドラムユニット 40 トナー 41 現像器本体 44 攪拌体 54・55 シート状部材 56 トナー残量検出部材 56a 凹溝 56b 側壁 57 清掃体 P Image recording device PU Process unit 1 Photoreceptor drum 2 Charger 3 Optical writing unit 4 Developing unit 5 Transfer unit 10 Drum unit 40 Toner 41 Developing device main body 44 Stirrer 54/55 Sheet member 56 Toner remaining amount detecting member 56a Recess Groove 56b Side wall 57 Cleaning body

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 現像器の本体内に配設したトナーの攪拌
体にトナー残量検出部を清掃するための清掃体を設け、
該清掃体は複数のシート状部材を積層して構成し、清掃
体の各々のシート状部材を、該シート状部材がトナー残
量検出部の被清掃部分と接する部位においては互いに非
固着状態に構成したことを特徴とする現像器。
A cleaning member for cleaning a toner remaining amount detecting portion is provided on a stirring member of the toner disposed in a main body of the developing device;
The cleaning body is formed by laminating a plurality of sheet-like members, and the respective sheet-like members of the cleaning body are not fixed to each other at a portion where the sheet-like members are in contact with a portion to be cleaned of the toner remaining amount detecting unit. A developing device characterized by comprising.
【請求項2】 現像器の本体内の底部側壁に攪拌体の回
転軌跡と同心円弧状に形成した凹溝を設けて、該凹溝の
両側壁を透明部材にて構成し、凹溝の両側壁外側にそれ
ぞれ光透過型センサの発光部と受光部とを配設して、前
記清掃体が攪拌体の回転に伴って凹溝両側壁内面に摺接
しながら該凹溝内を通過するよう構成したことを特徴と
する現像器。
2. A groove formed concentrically with the rotation trajectory of the stirrer is provided on a bottom side wall in the main body of the developing device, and both side walls of the groove are formed of transparent members, and both side walls of the groove are formed. The light-emitting portion and the light-receiving portion of the light transmission type sensor are arranged on the outside, respectively, and the cleaning body is configured to pass through the inside of the concave groove while slidingly contacting the inner surface of both side walls of the concave groove with the rotation of the stirring member. A developing device, characterized in that:
【請求項3】 請求項2記載の現像器において、前記清
掃体を二枚のシート状部材で構成し、回転方向に対して
前方に位置するシート状部材が前記凹溝幅と略同一幅に
形成され、後方に位置するシート状部材が凹溝幅よりも
若干大きく形成されて、両シート状部材は幅方向の中央
部で固着されていることを特徴とする現像器。
3. The developing device according to claim 2, wherein the cleaning body is constituted by two sheet-like members, and a sheet-like member located forward in the rotation direction has a width substantially equal to the width of the groove. The developing device is characterized in that the formed sheet-shaped member located rearward is formed slightly larger than the width of the groove, and both sheet-shaped members are fixed at the center in the width direction.
JP10207197A 1997-04-18 1997-04-18 Developing device Pending JPH10293445A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10207197A JPH10293445A (en) 1997-04-18 1997-04-18 Developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10207197A JPH10293445A (en) 1997-04-18 1997-04-18 Developing device

Publications (1)

Publication Number Publication Date
JPH10293445A true JPH10293445A (en) 1998-11-04

Family

ID=14317544

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10207197A Pending JPH10293445A (en) 1997-04-18 1997-04-18 Developing device

Country Status (1)

Country Link
JP (1) JPH10293445A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7088940B2 (en) 2003-08-25 2006-08-08 Murata Kikai Kabushiki Kaisha Image forming device
JP2008209897A (en) * 2007-01-31 2008-09-11 Canon Inc Developing apparatus, process cartridge and electrophotographic image forming apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7088940B2 (en) 2003-08-25 2006-08-08 Murata Kikai Kabushiki Kaisha Image forming device
JP2008209897A (en) * 2007-01-31 2008-09-11 Canon Inc Developing apparatus, process cartridge and electrophotographic image forming apparatus

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