JP2777906B2 - Toner empty detection device - Google Patents
Toner empty detection deviceInfo
- Publication number
- JP2777906B2 JP2777906B2 JP14121789A JP14121789A JP2777906B2 JP 2777906 B2 JP2777906 B2 JP 2777906B2 JP 14121789 A JP14121789 A JP 14121789A JP 14121789 A JP14121789 A JP 14121789A JP 2777906 B2 JP2777906 B2 JP 2777906B2
- Authority
- JP
- Japan
- Prior art keywords
- agitator
- toner
- display member
- detection
- developing device
- 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 - Fee Related
Links
- 238000001514 detection method Methods 0.000 title claims description 52
- 230000002269 spontaneous effect Effects 0.000 claims description 4
- 230000007423 decrease Effects 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
Description
【発明の詳細な説明】 〔概 要〕 非磁性一成分現像剤を用いる現像装置のトナーエンプ
ティ検知装置に関し、 簡単な構成でトナーエンプティを検出できるようにす
ることを目的とし、 トナーを収納する現像器外枠内に該トナー供給、撹拌
用のアジテータを備えた現像装置において、前記アジテ
ータの回転時にその前方で回転するように該アジテータ
と同軸に支持される検出部材を設け、かつ、前記外枠の
外方で前記アジテータの軸に第１の表示部材を固定する
とともに、前記外枠の外方で前記検出部材に、該検出部
外が前記アジテータとともに回転する際に前記第１の表
示部材と重なり、前記トナーの収納量が所定値以下のと
きの前記アジテータの回転時における前記検出部材の自
然落下に伴って前記第１の表示部材から露出する第２の
表示部材を設け、さらに、前記第１の表示部材から露出
する前記第２の表示部材を所定位置で検出する検出手段
を設けた構成とする。DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a toner empty detection device of a developing device using a non-magnetic one-component developer. A developing device provided with an agitator for supplying and agitating the toner in an outer frame of the developing device, wherein a detecting member is provided coaxially with the agitator so as to rotate in front of the agitator when the agitator rotates, and A first display member is fixed to the shaft of the agitator outside of the outer frame, and the first display member is connected to the detection member outside the outer frame when the outside of the detection unit rotates together with the agitator. A second table exposed from the first display member with the spontaneous fall of the detection member when the agitator rotates when the toner storage amount is equal to or less than a predetermined value. The member is provided, further, a structure in which a detection means for detecting said second display member is exposed from said first display member in a predetermined position.
本発明は非磁性一成分現像剤を用いる現像装置のトナ
ーエンプティ検知装置に関するものである。The present invention relates to a toner empty detecting device of a developing device using a non-magnetic one-component developer.
従来、現像装置のトナーエンプティの検知装置として
は、現像器内のトナーを供給、撹拌するアジテータの駆
動負荷トルクを機械的に検出する方式のものが知られて
いる。第７図は、特公昭62−502号公報（昭和62年１月
８日発行）に開示されたこの種の公知装置の構造を示す
斜視図で、図中、５はトナー補給ローラ、６は軸（アジ
テータ軸）、７は突出部材（アジテータクランク）、8,
10はギア、９は第１検出カム（第１の回転板）、11は第
２検出カム（第２の回転板）、12は第1,第２の検出カム
9,11間に張設されたコイルばね、13はころ、14はレバ
ー、15はアクチュエータ、16はばね、17はマイクロスイ
ッチである。アジテータの駆動は次のように行われる。2. Description of the Related Art Conventionally, as a toner empty detecting device of a developing device, a device that mechanically detects a driving load torque of an agitator that supplies and agitates toner in a developing device is known. FIG. 7 is a perspective view showing the structure of a known apparatus of this kind disclosed in Japanese Patent Publication No. Sho 62-502 (issued on Jan. 8, 1987). In FIG. Shaft (agitator shaft), 7 is a protruding member (agitator crank), 8,
10 is a gear, 9 is a first detection cam (first rotary plate), 11 is a second detection cam (second rotary plate), 12 is first and second detection cams
A coil spring stretched between 9, 11; 13, a roller; 14, a lever; 15, an actuator; 16, a spring; The driving of the agitator is performed as follows.
ギア10は図示しない駆動源により駆動され、この回転
は、ギア８を介し、軸６に遊合する第１の検出カム９に
伝えられる。そこで、軸６に固定された第２検出カム11
はコイルばね12を介し駆動され、軸６は突出部材７とと
もに回転する。トナー収納箱２内に収納されているトナ
ー量が十分なトナーフル時には、突出部材７には大きな
負荷トルクが働いているため、第８図（ｂ）に示すよう
に、第２検出カム11は第１検出カム９より遅れた状態と
なり（コイルばね16が所定量伸びた状態）、両検出カム
9,11の位相角がずれて該両検出カム9,11に形成された切
欠部9a,11aはずれる。従って、ばね16に賦勢されて両検
出カム9,11に圧接するころ13は切欠部9a,11aに落ち込ま
ず、マイクロスイッチ17は作動しない。一方、トナー量
が所定量以下となるトナーエンプティ時には、検出部材
７の負荷トルクが小さくなり、第８図（ａ）に示すよう
に、コイルばね12が縮んで両検出カム9,11の位相角が一
致し、ころ13は重なった状態の切欠部9a,11aに落ち込ん
でマイクロスイッチ17は作動する。この作動により、ト
ナーエンプティが検知される。The gear 10 is driven by a drive source (not shown), and this rotation is transmitted via a gear 8 to a first detection cam 9 which is loosely engaged with the shaft 6. Therefore, the second detection cam 11 fixed to the shaft 6
Is driven through a coil spring 12, and the shaft 6 rotates together with the projecting member 7. When the amount of toner stored in the toner storage box 2 is sufficient and the toner is full, a large load torque is applied to the protruding member 7, and as shown in FIG. One detection cam 9 is delayed (the coil spring 16 is extended by a predetermined amount).
Notch portions 9a and 11a formed in both detection cams 9 and 11 are displaced with the phase angles of 9 and 11 shifted. Therefore, the roller 13 biased by the spring 16 and pressed against the two detection cams 9, 11 does not fall into the notches 9a, 11a, and the microswitch 17 does not operate. On the other hand, when the toner amount is equal to or less than the predetermined amount, the load torque of the detecting member 7 decreases, and the coil spring 12 contracts and the phase angle of the detecting cams 9, 11 as shown in FIG. And the rollers 13 fall into the notches 9a and 11a in the overlapping state, and the microswitch 17 operates. With this operation, toner empty is detected.
この方式は、信頼性は高いが、部品点数が多くなるた
めにコストダウンに限度があり、より簡単な構成のトナ
ーエンプティ検知装置が望まれている。This method has high reliability, but has a limit in cost reduction due to an increase in the number of parts, and a toner empty detection device having a simpler configuration is desired.
本発明は、簡単な構成でトナーエンプティを検出する
ことのできるトナーエンプティ検知装置を提供すること
を目的としている。SUMMARY OF THE INVENTION An object of the present invention is to provide a toner empty detection device capable of detecting toner empty with a simple configuration.
上述の目的を達成するため、本発明では、トナーを収
納する現像器外枠内に該トナー供給、撹拌用のアジテー
タを備えた現像装置において、前記アジテータの回転時
にその前方で回転するように該アジテータと同軸に支持
される検出部材を設け、かつ、前記外枠の外方で前記ア
ジテータ28の軸に第１の表示部材を固定するとともに、
前記以外枠の外方で前記検出部材に、該検出部材が前記
アジテータとともに回転する際に前記第１の表示部材と
重なり、前記トナーの収納量が所定値以下のときの前記
アジテータの回転時における前記検出部材の自然落下に
伴って前記第１の表示部材から露出する第２の表示部材
を固定し、さらに、前記第１の表示部材から露出する前
記第２の表示部材を所定位置で検出する検出手段を設け
た構成とする。In order to achieve the above object, according to the present invention, in a developing device provided with an agitator for supplying and stirring the toner in a developing device outer frame for storing the toner, the developing device is configured to rotate in front of the agitator when the agitator rotates. A detection member provided coaxially with the agitator is provided, and a first display member is fixed to a shaft of the agitator 28 outside the outer frame,
When the detection member rotates together with the agitator outside the other frame, the detection member overlaps with the first display member, and when the agitator rotates when the toner storage amount is equal to or less than a predetermined value. A second display member exposed from the first display member is fixed with the spontaneous fall of the detection member, and the second display member exposed from the first display member is detected at a predetermined position. It is configured to have a detecting means.
収納トナー量が十分あるときは、アジテータの回転時
に、検出部材には負荷トルクが働くため、該検出部材は
アジテータとともに回転する。この場合は、第２の表示
部材は第１の表示部材と重なっており、検出手段は作動
しない。When the amount of stored toner is sufficient, a load torque acts on the detecting member when the agitator rotates, so that the detecting member rotates together with the agitator. In this case, the second display member overlaps the first display member, and the detection means does not operate.
収納トナー量がある程度減少すると、アジテートの回
転時に、検出部材には負荷トルクが働かなくなるので、
該検出部材は回転時の最上位置を越えたところで自然落
下を始めるが、収納トナー量が所定値より多いと、自然
落下した検出部材はトナーに当って途中で止まり、アジ
テータがその後の回転により追いつくので、検出手段の
位置では第２の表示部材が第１の表示部材に重なってい
て検出手段は作動しない。When the stored toner amount decreases to some extent, the load torque does not act on the detecting member during rotation of the agitate.
When the amount of stored toner is larger than a predetermined value, the spontaneously falling detecting member stops halfway against the toner, and the agitator catches up by the subsequent rotation. Therefore, at the position of the detection means, the second display member overlaps the first display member, and the detection means does not operate.
さらに収納トナー量が減少して所定値以下（トナーエ
ンプティ状態）になると、検出部材の自然落下により、
検出手段の位置では第２の表示部材が第１の表示部材か
ら露出したままで、検出手段は作動して第２の表示部材
を検出する。Further, when the amount of stored toner decreases to a predetermined value or less (toner empty state), the detection member naturally drops,
At the position of the detection means, the detection means operates and detects the second display member while the second display member remains exposed from the first display member.
すなわち、検出部材，第１・第２の表示部材，検出手
段を設けるだけの簡単な構成でトナーエンプティを検知
することができる。That is, the toner empty can be detected with a simple configuration only including the detection member, the first and second display members, and the detection means.
以下、第１図乃至第６図に関連して本発明の実施例を
説明する。Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 6.
第１図は本例の現像装置の要部構造を示す側面断面
図、第２図は同側面図、第３図は同正面図で、図中、21
は現像装置の要部である現像器、22はドラム状感光体、
23はトナーエンプティ検知装置である。FIG. 1 is a side sectional view showing a main structure of the developing device of this embodiment, FIG. 2 is a side view thereof, and FIG. 3 is a front view thereof.
Is a developing device as a main part of the developing device, 22 is a drum-shaped photoconductor,
23 is a toner empty detection device.
現像器21は、トナーを収納する現像器外枠24内に、供
給ローラ25と、現像ローラ26と、層厚規制ブレード27
と、アジテータ28とを設けて成り、感光体22に対向して
配置されている。アジテータ28は、現像器外枠24に支持
されるステンレスの軸28Aと、該軸28Aに一体的に形成さ
れたステンレスのクランク部28Bと、軸28Aに嵌装された
コイル28C（第１図参照）とより成る。このアジテータ2
8は、第３図に示すように、図示しない駆動系により駆
動される現像ローラ26によって、ギア41,42を介し駆動
されて回転する。The developing device 21 includes a supply roller 25, a developing roller 26, and a layer thickness regulating blade 27 in a developing device outer frame 24 that stores toner.
And an agitator 28, and are arranged to face the photoconductor 22. The agitator 28 includes a stainless steel shaft 28A supported by the developing device outer frame 24, a stainless steel crank portion 28B formed integrally with the shaft 28A, and a coil 28C fitted on the shaft 28A (see FIG. 1). ). This agitator 2
As shown in FIG. 3, the developing roller 8 is driven and rotated via gears 41 and 42 by a developing roller 26 driven by a driving system (not shown).
トナーエンプティ検知装置23は、第４図に詳細を示す
ように、検出部材29と、第１の表示部材30と、第２の表
示部材31と、検出手段32とより構成されている。検出部
材29は、ステンレスで形成され、アジテータ28の回転時
にその前方で回転するように該アジテータ28と同軸に支
持（軸28Aに支持）されている。第１の表示部材30は、
現像器外枠24の外方で軸28Aに固定されている。第２の
表示部材31は、現像器外枠24の外方で検出部材29に固定
されており、検出部材29がアジテータ28とともに回転す
るときは第１の表示部材31に重なるようになっている。
検出手段32は、第１の表示部材31から露出する第２の表
示部材（詳細後述）を所定位置で検出するためのもの
で、光センサ等で構成される。第１の表示部材30は光を
反射しない材料で形成（表面を黒色にする等）され、第
２の表示部材31は光を反射する材料（ステンレス等）で
形成されている。As shown in detail in FIG. 4, the toner empty detection device 23 includes a detection member 29, a first display member 30, a second display member 31, and detection means 32. The detection member 29 is formed of stainless steel, and is supported coaxially with the agitator 28 (supported on the shaft 28A) so as to rotate in front of the agitator 28 when the agitator 28 rotates. The first display member 30 is
It is fixed to the shaft 28A outside the developing device outer frame 24. The second display member 31 is fixed to the detection member 29 outside the developing device outer frame 24. When the detection member 29 rotates together with the agitator 28, the second display member 31 overlaps the first display member 31. .
The detection means 32 is for detecting a second display member (detailed later) exposed from the first display member 31 at a predetermined position, and is constituted by an optical sensor or the like. The first display member 30 is formed of a material that does not reflect light (such as making the surface black), and the second display member 31 is formed of a material that reflects light (such as stainless steel).
次に、この現像器の作用及びトナーエンプティ検知装
置の作用について順を追って説明する。Next, the operation of the developing device and the operation of the toner empty detection device will be described step by step.
現像器外枠24内の収納されているトナー100は、アジ
テータ28により撹拌され、供給ローラ25により現像ロー
ラ26上に供給される。供給されたトナー100はブレード2
7により層厚を規制され、該層厚を規制されたトナー100
により、感光体22の表面に形成された潜像に対する現像
が行われる。The toner 100 stored in the developing device outer frame 24 is agitated by the agitator 28 and is supplied onto the developing roller 26 by the supply roller 25. The supplied toner 100 is the blade 2
7, the layer thickness is regulated, and the toner thickness is regulated.
As a result, the latent image formed on the surface of the photoconductor 22 is developed.
この現像時にアジテータ28が回転する際に、収納トナ
ー量が第１図に示すように十分多い場合は、検出部材29
にはトナーによる負荷トルクが働くため、該検出部材29
は第１図に示すようにコイル28Cに接した状態でアジテ
ータ28とともに回転する。このときは、第２の表示部材
31は第2,4図に示すように第１の表示部材30の内側にか
くれて重なっており、検出手段32は作動しない。When the agitator 28 rotates during this development and the amount of stored toner is sufficiently large as shown in FIG.
Since the load torque by the toner acts on the detection member 29,
Rotates together with the agitator 28 while being in contact with the coil 28C as shown in FIG. At this time, the second display member
As shown in FIGS. 2 and 4, reference numeral 31 hides and overlaps the inside of the first display member 30, and the detecting means 32 does not operate.
収納トナー量が第５図に示すようにある程度減少する
と、検出部材29の最上位置（第５図の位置）では該検出
部材29にはトナーによる負荷トルクが働かず、アジテー
タ28の回転とともにこの位置まできた検出部材29は、こ
の位置を過ぎると自然落下をする。しかし落下した検出
部材29は、すぐにトナー100に当って止まり、アジテー
タ28がその後の回転により追いつく。その後は、検出部
材29はアジテータ28とともに回転し、検出手段32の位置
では第２の表示部材31が第１の表示部材30に重なりかく
れて検出手段32は作動しない。When the amount of stored toner is reduced to some extent as shown in FIG. 5, at the uppermost position of the detecting member 29 (the position shown in FIG. 5), no load torque is applied to the detecting member 29 by the toner. The detecting member 29 that has reached falls naturally after passing this position. However, the detecting member 29 that has fallen immediately hits the toner 100 and stops, and the agitator 28 catches up with the subsequent rotation. Thereafter, the detection member 29 rotates together with the agitator 28, and the second display member 31 overlaps the first display member 30 at the position of the detection means 32, so that the detection means 32 does not operate.
さらに収納量が減少して第６図に示すように所定値以
下のトナーエンプティ状態になると、検出部材29の自然
落下により、検出手段32の位置では第２の表示部材31が
第１の表示部材30から露出したままで、検出手段32はこ
の第２の表示部材31を検出する。すなわち、トナーエン
プティが検知される。When the storage amount further decreases and becomes a toner empty state below a predetermined value as shown in FIG. 6, the second display member 31 is moved to the first display member at the position of the detection means 32 due to the spontaneous fall of the detection member 29. The detection means 32 detects the second display member 31 while being exposed from the light source 30. That is, toner empty is detected.
以上述べたように、本発明によれば、簡単な構成でト
ナーエンプティを検出することが可能である。As described above, according to the present invention, it is possible to detect toner empty with a simple configuration.
第１図は本発明の実施例の現像装置の要部構造を示す側
面断面図、 第２図は同側面図、 第３図は同正面図、 第４図は本発明の実施例のトナーエンプティ検知装置の
斜視図、 第５図及び第６図は同作用説明図、 第７図は従来のトナーエンプティ検知装置の構造を示す
斜視図、 第８図（ａ），（ｂ）は第７図の装置の作用説明図で、 図中、 24は現像器外枠、 28はアジテータ、 28Aはアジテータの軸、 29は検出部材、 30は第１の表示部材、 31は第２の表示部材、 32は検出手段である。1 is a side sectional view showing the structure of a main part of a developing device according to an embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a front view thereof, and FIG. FIGS. 5 and 6 are explanatory views of the same operation, FIG. 7 is a perspective view showing the structure of a conventional toner empty detection device, and FIGS. 8 (a) and (b) are FIG. In the drawing, reference numeral 24 denotes an outer frame of the developing device, 28 denotes an agitator, 28A denotes a shaft of an agitator, 29 denotes a detection member, 30 denotes a first display member, 31 denotes a second display member, and 32 denotes a second display member. Is detection means.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭64−49068（ＪＰ，Ａ) 実開 昭61−182555（ＪＰ，Ｕ) 実開 昭58−154957（ＪＰ，Ｕ) 実開 昭61−60262（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) G03G 15/08──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-49068 (JP, A) JP-A 61-182555 (JP, U) JP-A 58-154957 (JP, U) JP-A 61-182 60262 (JP, U) (58) Field surveyed (Int. Cl. 6 , DB name) G03G 15/08
Claims (1)
トナー供給、撹拌用のアジテータ（28）を備えた現像装
置において、 前記アジテータ（28）の回転時にその前方で回転するよ
うに該アジテータ（28）と同軸に支持される検出部材
（29）を設け、 かつ、前記外枠（24）の外方で前記アジテータ28の軸
（28A）に第１の表示部材30を固定するとともに、 前記外枠（24）の外方で前記検出部材（29）に、該検出
部材（29）が前記アジテータ（28）とともに回転する際
に前記第１の表示部材（30）と重なり、前記トナーの収
納量が所定値以下のときの前記アジテータ（28）の回転
時における前記検出部材（29）の自然落下に伴って前記
第１の表示部材（30）から露出する第２の表示部材（3
1）を固定し、 さらに、前記第１の表示部材（30）から露出する前記第
２の表示部材（31）を所定位置で検出する検出手段（3
2）を設けたことを特徴とするトナーエンプティ検知装
置。1. A developing device comprising an agitator (28) for supplying and agitating a toner in a developing device outer frame (24) for accommodating a toner, wherein the agitator (28) is rotated in front of the rotating agitator (28). A detection member (29) supported coaxially with the agitator (28), and a first display member 30 fixed to the shaft (28A) of the agitator 28 outside the outer frame (24). In addition, the detection member (29) overlaps with the first display member (30) when the detection member (29) rotates together with the agitator (28) outside the outer frame (24), A second display member (30) exposed from the first display member (30) with the spontaneous fall of the detection member (29) when the agitator (28) rotates when the toner storage amount is equal to or less than a predetermined value. Three
1), and a detecting means (3) for detecting at a predetermined position the second display member (31) exposed from the first display member (30).
2) A toner empty detection device characterized by comprising:
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14121789A JP2777906B2 (en) | 1989-06-05 | 1989-06-05 | Toner empty detection device |
| AU56052/90A AU621224C (en) | 1989-06-01 | 1990-05-29 | Developing device used in electrophotographic field |
| US07530518 US5068691B1 (en) | 1989-06-01 | 1990-05-30 | Developing device with a controllable pressure release for the developing roller |
| EP90305946A EP0401020B1 (en) | 1989-06-01 | 1990-05-31 | Developing devices for use in electrophotographic apparatus |
| EP94107536A EP0613065B1 (en) | 1989-06-01 | 1990-05-31 | Developing devices for use in electrophotographic apparatus |
| DE69026630T DE69026630T2 (en) | 1989-06-01 | 1990-05-31 | Development devices for electrophotographic devices |
| DE69015446T DE69015446T2 (en) | 1989-06-01 | 1990-05-31 | Development devices for electrophotographic devices. |
| DE69028124T DE69028124T2 (en) | 1989-06-01 | 1990-05-31 | Development devices for electrophotographic devices |
| EP94107551A EP0613066B1 (en) | 1989-06-01 | 1990-05-31 | Developing devices for use in electrophotographic apparatus |
| KR90008117A KR940008789B1 (en) | 1989-06-01 | 1990-06-01 | Developing devices for use in electrophotographic apparatus |
| KR93024768A KR940008790B1 (en) | 1989-06-01 | 1993-11-19 | Developing apparatus for use in electrophotographic field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14121789A JP2777906B2 (en) | 1989-06-05 | 1989-06-05 | Toner empty detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH036581A JPH036581A (en) | 1991-01-14 |
| JP2777906B2 true JP2777906B2 (en) | 1998-07-23 |
Family
ID=15286860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14121789A Expired - Fee Related JP2777906B2 (en) | 1989-06-01 | 1989-06-05 | Toner empty detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2777906B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101561645B (en) * | 2008-04-15 | 2011-08-10 | 株式会社理光 | Image forming equipment |
-
1989
- 1989-06-05 JP JP14121789A patent/JP2777906B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101561645B (en) * | 2008-04-15 | 2011-08-10 | 株式会社理光 | Image forming equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH036581A (en) | 1991-01-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |