JPH02204763A - Developing device for electrophotographic device - Google Patents
Developing device for electrophotographic deviceInfo
- Publication number
- JPH02204763A JPH02204763A JP1024503A JP2450389A JPH02204763A JP H02204763 A JPH02204763 A JP H02204763A JP 1024503 A JP1024503 A JP 1024503A JP 2450389 A JP2450389 A JP 2450389A JP H02204763 A JPH02204763 A JP H02204763A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- hopper
- rotated
- developing
- chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 description 21
- 108091008695 photoreceptors Proteins 0.000 description 13
- 238000004140 cleaning Methods 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000002542 deteriorative 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
- 230000032258 transport Effects 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
産」ＬヒΩｌ」Ｌ交野−
この発明は、レーザプリンタ・レーザ複写機・レーザフ
ァクシミリなど、電子写真方式によって用紙に画像を形
成する電子写真装置に適用し得る。DETAILED DESCRIPTION OF THE INVENTION The present invention can be applied to electrophotographic devices that form images on paper using an electrophotographic method, such as laser printers, laser copying machines, and laser facsimiles.
詳しくは、そのような電子写真装置において、感光体表
面にトナーを付着し、該表面に形成した静電潜像を可視
像化する現像装置に関する。More specifically, the present invention relates to a developing device that attaches toner to the surface of a photoreceptor and visualizes an electrostatic latent image formed on the surface in such an electrophotographic apparatus.
且米旦致生
従来、この種の現像装置では、たとえば第９図に示すよ
うに１本体ケーシング１内にトナー供給室２と現像室３
とを形成する。そして、トナー供給室２内には、分割し
て２つのホッパ室２ａ・２ｂを形成していた。しかして
、それら各ホッパ室２ａ・２ｂ内にそれぞれトナー補給
手段（アジテータ）４ａ・４ｂを設け、それら各トナー
補給手段４ａ・４ｂで順次各ホッパ室２ａ・２ｂを経て
トナー５を現像ローラ６へと送る構成となっていた。Conventionally, this type of developing device has a toner supply chamber 2 and a developing chamber 3 in one main body casing 1, as shown in FIG.
and form. The toner supply chamber 2 is divided into two hopper chambers 2a and 2b. Therefore, toner replenishing means (agitators) 4a and 4b are provided in each of the hopper chambers 2a and 2b, and the toner 5 is sequentially transferred to the developing roller 6 through each of the hopper chambers 2a and 2b. It was configured to send.
なお１図中７はトナー供給室２上に交換自在に取り付け
るトナーカートリッジであり、８は加圧ばね９の付勢力
で現像室３内の現像ローラ６を押し当てる感光体である
。Note that 7 in FIG. 1 is a toner cartridge that is replaceably mounted on the toner supply chamber 2, and 8 is a photoreceptor that presses the developing roller 6 in the developing chamber 3 with the biasing force of a pressure spring 9.
が しようとする課
ところが、この種の従来の現像装置では、各ホッパ室２
ａ・２ｂ内の各トナー補給手段４ａ・４ｂを常に回転し
、トナー供給室２内のトナー５を常時混ぜ合わせるから
、トナー５の劣化が早まる問題があった。However, in this type of conventional developing device, each hopper chamber 2
Since the toner replenishing means 4a and 4b in the toner supply chambers a and 2b are constantly rotated to constantly mix the toner 5 in the toner supply chamber 2, there is a problem that the toner 5 deteriorates more quickly.
特に、近年大型の電子写真装置がつくられ、それに備え
るトナー供給室２が大型化して一回のトナー補給量が多
くなると、トナー５の劣化がさらに早まる。そして、ト
ナー残量が少なくなるころには、劣化トナーのみが残っ
て画像品質が低下する問題があった。−成分トナーを使
用するとき。In particular, in recent years, when large-sized electrophotographic apparatuses have been manufactured and the toner supply chamber 2 provided therein has become larger and the amount of toner supplied at one time has increased, the deterioration of the toner 5 becomes even faster. Then, when the amount of remaining toner becomes low, only deteriorated toner remains, resulting in a problem that the image quality deteriorates. - When using component toners.
特にそれが顕著であった。This was especially noticeable.
そこで、この発明の目的は、電子写真装置の現像装置に
おけるそのような従来の問題点を解消し。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve such conventional problems in the developing device of an electrophotographic apparatus.
各トナー補給手段の回転によるトナーの混ぜ合わせを少
なくしてトナーの劣化を防ぎ１画像品質の低下を防止す
ることにある。To prevent deterioration of toner by reducing mixing of toner due to rotation of each toner replenishing means and to prevent deterioration of image quality.
課題を解 するための
そのため、この発明は、たとえば以下の図示実施例に示
すとおり、トナー供給室２６内を分割して複数のホッパ
室２６ａ・２６ｂを形成するとともに、それら各ホッパ
室２６ａ・２６ｂ内にそれぞれトナー補給手段３８・３
９を設け、それら各トナー補給手段３８・３９で順次そ
れら各ホッパ室２６ａ・２６ｂを経てトナー２８を現像
ローラ２７へと送る電子写真装置の現像装置１６におい
て、前記複数のホッパ室２６ａ・２６ｂのうち、前記現
像ローラ２７に近い側のホッパ室２６ａにトナー残量検
知手段４５を設け、そのトナー残量検知手段４５で該ホ
ッパ室２６ａ内のトナー残量が一定以下となったことを
検知したとき、前記現像ローラ２７に遠い側の前記ホッ
パ室２６ｂ内における前記トナー補給手段３９を駆動し
て前記現像ローラ２７に近い側のホッパ室２６ａにトナ
ー２８を送り込むトナー補給駆動手段４６を備えること
を特徴とする。In order to solve the problem, the present invention divides the inside of the toner supply chamber 26 to form a plurality of hopper chambers 26a and 26b, and each of the hopper chambers 26a and 26b has a plurality of hopper chambers 26a and 26b. Toner replenishment means 38 and 3 respectively inside
In the developing device 16 of the electrophotographic apparatus, the toner replenishing means 38 and 39 sequentially send the toner 28 to the developing roller 27 through the hopper chambers 26a and 26b. Of these, a remaining toner amount detection means 45 is provided in the hopper chamber 26a on the side closer to the developing roller 27, and the remaining toner amount detection means 45 detects that the remaining amount of toner in the hopper chamber 26a is below a certain level. In this case, a toner replenishment driving means 46 is provided which drives the toner replenishment means 39 in the hopper chamber 26b on the side far from the developing roller 27 and feeds the toner 28 into the hopper chamber 26a on the side closer to the developing roller 27. Features.
務−一亙
そして、トナー残量検知手段４５で、現像ローラ２７に
近い側のホッパ室２６ａ内におけるトナー残量が一定以
下となったことを検知したとき。When the remaining toner amount detection means 45 detects that the remaining amount of toner in the hopper chamber 26a on the side closer to the developing roller 27 has become below a certain level.
トナー補給駆動手段４６で、現像ローラ２７に遠い側の
ホッパ室２６ｂ内におけるトナー補給手段３９を駆動し
、現像ローラ２７に近い側のホッパ室２６ａにトナー２
８を送り込む。The toner replenishment drive means 46 drives the toner replenishment means 39 in the hopper chamber 26b on the side far from the developing roller 27, and supplies the toner 2 to the hopper chamber 26a on the side closer to the developing roller 27.
Send in 8.
大−皇一■
以下、図面を参照しつつ、この発明の一実施例につき説
明する。Dai-Koichi ■ Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
第８図は、一実施例である現像装置を備えるレーザプリ
ンタであり、その内部機構の全体概略構成を示す０図中
符号１０は、プリンタ本体である。FIG. 8 shows a laser printer equipped with a developing device according to an embodiment, and the reference numeral 10 in FIG.
プリンタ本体１０の図中右側には、給紙カセット１１・
１１を二段に取り付ける。そして、その−方の給紙カセ
ット１１から用紙１００を矢印イ方向に送り出し、先端
をレジストローラ対１２に当てて止める。しかして、そ
のレジストローラ対１２でタイミングをとってドラム状
の感光体１３へと搬送する。感光体１３は１時計方向に
回転駆動し、その際帯電チャージャ１４によって表面を
一様に帯電する。その後、レーザ光学系１５からのレー
ザ光を照射し、その感光体１３上に静電潜像を形成する
。この潜像は現像装置１６を通るときトナーによって可
視像化し、その可視像は上述のごとく感光体１３へ搬送
される用紙１００に転写チャージャ１７により転写する
。転写した用紙１００上の可視像は、定着装置！１８に
よって定着する。定着装置１８を出た用紙１００は、た
とえば矢印口方向へと送り出し、プリンタ本体１０上の
排紙部１９・１９へと排出する。一方、可視像転写後の
感光体１３は、クリーニング装置２０によって残留トナ
ーを除去する。On the right side of the printer main body 10 in the figure, there is a paper feed cassette 11.
Attach 11 in two stages. Then, the paper 100 is sent out from the - side paper feed cassette 11 in the direction of arrow A, and the leading end hits the pair of registration rollers 12 and is stopped. Then, the pair of registration rollers 12 transports the photoreceptor to the drum-shaped photoreceptor 13 at the appropriate timing. The photoreceptor 13 is rotated one clockwise direction, and the surface is uniformly charged by the charger 14 at this time. Thereafter, laser light from the laser optical system 15 is irradiated to form an electrostatic latent image on the photoreceptor 13. This latent image is made visible by toner when passing through the developing device 16, and the visible image is transferred by the transfer charger 17 onto the paper 100 that is conveyed to the photoreceptor 13 as described above. The visible image on the transferred paper 100 is the fixing device! Fixed by 18. The paper 100 that has left the fixing device 18 is sent out, for example, in the direction of the arrow, and is ejected to the paper ejection sections 19 on the printer main body 10. On the other hand, the cleaning device 20 removes residual toner from the photoreceptor 13 after the visible image has been transferred.
ところで、上述した現像装置１１１６は、第７図に示す
ごとき構成を有する。図中符号２４は本体ケーシングで
あり、その中に現像室２５とトナー供給室２６とを連続
して設ける。現像室２５は、感光体１３側に開口２５ａ
を有し、その間口２５ａ位置に現像ローラ２７を備える
。現像ローラ２７は、感光体１３と接触してその表面に
トナー２８を付着し、その感光体１３表面上の潜像を可
視像化する。現像室２５内には、またドクターローラ２
９を備える。ドクターローラ２９は、現像ローラ２７の
図中上側に押し当て、該現像ローラ２７表面のトナー層
を１０〜２０μに薄層化する。そのドクターローラ２９
の外周には、スクレーパ３０の先端を押し当てる。スク
レーパ３０は、基端をねじ３１で本体ケーシング２４に
取り付け、ドクターローラ２９に付着するトナー２８を
かき落してそれをクリーニングする。現像室２５内には
、またさらにクリーニングローラ３２を備える。クリー
ニングローラ３２は、現像ローラ２７の図中斜め下側に
押し当て、該現像ローラ２７の表面をクリーニングする
。そのクリーニングローラ３２の外周には、クリーニン
グローラスクレーパ３３の先端を押し当てる。スクレー
パ３３は、基端をねじ３４で本体ケーシング２４に取り
付け、クリーニングローラ３２に付着するトナー２８を
かき落してそれをクリーニングする。By the way, the above-mentioned developing device 1116 has a configuration as shown in FIG. Reference numeral 24 in the figure is a main body casing, in which a developing chamber 25 and a toner supply chamber 26 are successively provided. The developing chamber 25 has an opening 25a on the photoreceptor 13 side.
A developing roller 27 is provided at the opening 25a. The developing roller 27 comes into contact with the photoreceptor 13 and deposits toner 28 on the surface of the photoreceptor 13, thereby visualizing the latent image on the surface of the photoreceptor 13. There is also a doctor roller 2 in the developing chamber 25.
Equipped with 9. The doctor roller 29 is pressed against the upper side of the developing roller 27 in the drawing to thin the toner layer on the surface of the developing roller 27 to a thickness of 10 to 20 microns. That doctor roller 29
The tip of the scraper 30 is pressed against the outer periphery of. The scraper 30 has its base end attached to the main body casing 24 with a screw 31, and scrapes off the toner 28 adhering to the doctor roller 29 to clean it. A cleaning roller 32 is further provided within the developing chamber 25 . The cleaning roller 32 presses the developing roller 27 obliquely downward in the figure to clean the surface of the developing roller 27. The tip of a cleaning roller scraper 33 is pressed against the outer periphery of the cleaning roller 32. The scraper 33 has its base end attached to the main body casing 24 with a screw 34, and scrapes off the toner 28 adhering to the cleaning roller 32 to clean it.
一方、トナー供給室２６は、上方に開口２６ａを有し、
そこにトナーカートリッジ３６を取り付ける。そして、
トナーカートリッジ３６の交換により、該トナー供給室
２６内にトナー２８を補給する。そのトナー供給室２６
内には５分割して２つのホッパ室２６ａ・２６ｂを形成
する。現像ローラ２７に近い側のホッパ室２６ａには、
トナー２８を撹拌して補給ローラ３７を介してトナー２
８を現像ローラ２７へと補給するトナー補給手段（アジ
テータ）３８を有する。補給ローラ３８は、ホッパ室２
６ａ内に備え、図示するように現像ローラ２７の図中右
側に押し当ててなる。一方、現像ローラ２７に遠い側の
ホッパ室２６ｂには、トナー２８を撹拌して現像ローラ
２７側のホッパ室２６ａへとトナー２８を送るトナー補
給手段（アジテータ）３９を有する。トナー補給手段３
８・３９は、それぞれ軸４０・４１を中心として回転す
る公知のものである。On the other hand, the toner supply chamber 26 has an opening 26a at the top,
Attach the toner cartridge 36 there. and,
By replacing the toner cartridge 36, toner 28 is replenished into the toner supply chamber 26. The toner supply chamber 26
The interior is divided into five to form two hopper chambers 26a and 26b. In the hopper chamber 26a on the side closer to the developing roller 27,
The toner 28 is stirred and transferred to the toner 2 via the replenishment roller 37.
8 to the developing roller 27. The supply roller 38 is connected to the hopper chamber 2.
6a, and is pressed against the right side of the developing roller 27 as shown in the figure. On the other hand, the hopper chamber 26b on the side far from the developing roller 27 includes a toner replenishing means (agitator) 39 that agitates the toner 28 and sends the toner 28 to the hopper chamber 26a on the developing roller 27 side. Toner supply means 3
8 and 39 are known ones that rotate around axes 40 and 41, respectively.
なお、図中符号４２は、現像袋Ｍ１６を付勢して現像ロ
ーラ２７を感光体１３に押し当てる加圧ばねである。Note that the reference numeral 42 in the figure is a pressure spring that urges the developing bag M16 and presses the developing roller 27 against the photoreceptor 13.
さて、この発明による現像袋ｒＩ１１６では、第１図に
示すように、複数のホッパ室２６ａ・２６ｂのうち、現
像ローラ２７に近い側のホッパ室２６ａに、トナー残量
検知手段４５を設けてなる。他方、そのトナー残量検知
手段４５で、該ホッパ室２６ａ内のトナー残量が一定以
下となったことを検知したとき、現像ローラ２７に遠い
側のホッパ室２６ｂ内におけるトナー補給手段３９を駆
動し、現像ローラ２７に近い側のホッパ室２６ａにトナ
ー２８を送り込むトナー補給駆動手段４６を備えてなる
。Now, in the developing bag rI116 according to the present invention, as shown in FIG. 1, a toner remaining amount detection means 45 is provided in the hopper chamber 26a on the side closer to the developing roller 27 among the plurality of hopper chambers 26a and 26b. . On the other hand, when the remaining toner amount detecting means 45 detects that the remaining amount of toner in the hopper chamber 26a is below a certain level, the toner replenishing means 39 in the hopper chamber 26b on the side far from the developing roller 27 is driven. It also includes a toner replenishment drive means 46 for feeding the toner 28 into the hopper chamber 26a on the side closer to the developing roller 27.
トナー残量検知手段４２は、第２図に示すように、軸４
０に取り付けて互いに対向して設ける２つの検出円板５
０・５１と、その間に設けるコイルスプリング５２とか
らなる０片方の検出円板５０は、その中心に軸４０を貫
通させてそれに固定し、外周に四角い切欠き５０ａを形
成するとともに、他方の検出円板５１に向けて軸４０と
平行にピン５３を立ててなる。他方の検出円板５１は、
その中心に軸４０を貫通させてそれに回転自在に取り付
け、外周に三角の切欠き５１ａを形成するとともに、ピ
ン５３の先端が入り込む円弧孔５１ｂをあけてなる。コ
イルスプリング５２は、軸４０に巻き付け、一端を検出
円板５０に、他端を検出円板５１に掛ける。そして、検
出円板５１を図中矢印ａ示方向に付勢し、第３図に示す
ように円弧孔５１ｂの一側をピン５３に押し当てて両切
欠き５０ａ・５１ａを一致させてなる。ところが、トナ
ー補給手段３８の駆動にともない軸４０が第２図中矢印
す方向に回転すると、それに固定する一方の検出円板５
０も同方向に回転する。しかし、トナー２８の残量が多
いとき、それが負荷となって他方の検出円板５１は回転
しない。故に、ピン５３が円弧孔５１ｂ内を移動し、第
４図に示すように円弧孔５１ｂの他側に押し当たる、そ
して。As shown in FIG.
Two detection disks 5 attached to 0 and provided facing each other
0.51 and a coil spring 52 provided between them. One detection disk 50 has a shaft 40 passed through its center and is fixed thereto, and a square notch 50a is formed on the outer periphery. A pin 53 is erected parallel to the shaft 40 toward the disk 51. The other detection disk 51 is
A shaft 40 is passed through its center and rotatably attached thereto, and a triangular notch 51a is formed on the outer periphery, and an arcuate hole 51b into which the tip of a pin 53 is inserted is bored. The coil spring 52 is wound around the shaft 40 and hung on the detection disk 50 at one end and on the detection disk 51 at the other end. Then, the detection disk 51 is urged in the direction indicated by the arrow a in the figure, and as shown in FIG. 3, one side of the arcuate hole 51b is pressed against the pin 53 so that both the notches 50a and 51a are aligned. However, when the shaft 40 rotates in the direction indicated by the arrow in FIG. 2 as the toner supply means 38 is driven, one of the detection discs 5 fixed thereto
0 also rotates in the same direction. However, when there is a large amount of toner 28 remaining, this becomes a load and the other detection disk 51 does not rotate. Therefore, the pin 53 moves within the circular arc hole 51b and presses against the other side of the circular arc hole 51b, as shown in FIG.
そのピン５３で、他方の検出円板５１を回転する。The pin 53 rotates the other detection disk 51.
よって、このとき雨検出円板５０・５１は、それぞれの
切欠き５０ａ・５１ａを一致することなく、ともに矢印
す方向に回転することとなる。これに対し、トナー２８
の残量が少なくなると、負荷が小さくなるから、検出円
板５１はコイルスプリング５２の付勢力で回転して第３
図に示す状態に戻る。そして、雨検出円板５０・５１は
、それぞれの切欠き５０ａ・５１ａを一致した状態で、
ともに矢印す方向に回転することとなる。Therefore, at this time, the rain detection discs 50 and 51 rotate in the direction indicated by the arrow without aligning the respective notches 50a and 51a. On the other hand, toner 28
When the remaining amount of
Return to the state shown in the figure. Then, the rain detection discs 50 and 51 are arranged so that the respective notches 50a and 51a are aligned.
Both will rotate in the direction of the arrow.
一方、トナー補給駆動手段４６は、第５図および第６図
に示すように、アーム５５と、そのアーム５５の先端を
雨検出円板５０・５１の外周に押し当てる付勢ばね５６
と、アーム５５の基端をトナー補給手段３９の軸４１に
取り付けるワンウェイクラッチ５７とからなる。そして
、ホッパ室２６ａ内のトナー２８の残量が多いときは、
上述したように雨検出円板５０・５１のそれぞれの切欠
き５０ａ・５１ａは第４図に示すごとく一致しないから
、第５図に示すように雨検出円板５０・５１の外周に押
し当たるアーム５５は揺動しない。On the other hand, as shown in FIGS. 5 and 6, the toner supply driving means 46 includes an arm 55 and a biasing spring 56 that presses the tip of the arm 55 against the outer periphery of the rain detection discs 50 and 51.
and a one-way clutch 57 that attaches the base end of the arm 55 to the shaft 41 of the toner replenishing means 39. When there is a large amount of toner 28 remaining in the hopper chamber 26a,
As mentioned above, the notches 50a and 51a of the rain detection discs 50 and 51 do not match as shown in FIG. 55 does not swing.
よって、このとき軸４１は回転せず、ホッパ室２６ｂ内
のトナー補給手段３９は駆動しない、ところが、ホッパ
室２６ａのトナー２８の残量が少なくなると、上述した
ように雨検出円板５０・６１のそれぞれの切欠き５０ａ
・５１ａは第３図に示すごとく一致するから、雨検出円
板５０・５１の外周に押し当たるアーム５５の先端は第
６図に示すようにそれらの切欠き５０ａ・５１ａ内に周
期的に落ち込む、よって、アーム５５はその都度揺動し
、軸４１をワンウェイクラッチ５７を介して第６図中矢
示する一方向に回転し、トナー補給手段３９を駆動する
。Therefore, at this time, the shaft 41 does not rotate and the toner replenishing means 39 in the hopper chamber 26b is not driven. However, when the remaining amount of toner 28 in the hopper chamber 26a becomes low, the rain detection discs 50 and 61 are activated as described above. each notch 50a of
51a coincide as shown in FIG. 3, the tips of the arms 55 that press against the outer peripheries of the rain detection discs 50 and 51 fall periodically into the notches 50a and 51a, as shown in FIG. 6. Therefore, the arm 55 swings each time, rotates the shaft 41 in one direction shown by the arrow in FIG. 6 via the one-way clutch 57, and drives the toner replenishing means 39.
上述した図示実施例では、トナー供給室２６を２つに分
割してホッパ室２６ａ・２６ｂを形成する場合を示した
が、２つに限ることなく、３つ以上に分割してもよい。In the illustrated embodiment described above, the toner supply chamber 26 is divided into two to form the hopper chambers 26a and 26b, but the toner supply chamber 26 is not limited to two, and may be divided into three or more.
１明の効果
したがって、この発明によれば、複数のホッパ室内にお
けるすべてのトナー補給手段を常に回転することなく、
トナー残量検知手段で、現像ローラに近い側のホッパ室
内におけるトナー残量が一定以下となったことを検知し
たとき、トナー補給駆動手段で、現像ローラに遠い側の
ホッパ室内におけるトナー補給手段をはじめて駆動し、
現像ローラに近い側のホッパ室にトナーを送り込むよう
にしたから、各トナー補給手段の同時回転によるトナー
の混ぜ合わせを少なくシ、トナーの劣化を防ぎ１画像品
質の低下を防止することができる。1. Advantageous Effects Therefore, according to the present invention, all toner replenishing means in a plurality of hopper chambers are not constantly rotated.
When the remaining toner amount detection means detects that the remaining amount of toner in the hopper chamber on the side closer to the developing roller is below a certain level, the toner replenishment drive means activates the toner replenishment means in the hopper chamber on the side farther from the developing roller. Drive for the first time,
Since the toner is sent to the hopper chamber on the side closer to the developing roller, mixing of the toners due to simultaneous rotation of each toner replenishing means can be reduced, and deterioration of the toner can be prevented and image quality can be prevented from deteriorating.
第１図ないし第８図にはこの発明の一実施例である現像
装置を示し、第１図はその断面図、第２図は該現像装置
のトナー残量検知手段を示す斜視図、第３図および第４
図はそれぞれそのトナー残量検知手段の作動を説明する
説明図、第５図および第６図は該現像装置のトナー補給
駆動手段のそれぞれ作動説明図、第７図は該現像装置の
トナー送りを説明する断面図、第８図は該現像装置を備
えるレーザプリンタの内部機構の全体概略構成図である
６第９図は、従来の現像装置を説明する断面図である。
１６・・・・・・・・・現像装置
２６・・・・・・・・・トナー供給室
２６ａ・・・・・・・・・現像ローラに近い側のホッパ
室２６ｂ・・・・・・・・・現像ローラに遠い側のホッ
パ室２７・・・・・・・・・現像ローラ
２８・・・・・・・・・トナー1 to 8 show a developing device which is an embodiment of the present invention, FIG. 1 is a sectional view thereof, FIG. 2 is a perspective view showing a remaining amount of toner detecting means of the developing device, and FIG. Figure and 4th
The figures are explanatory diagrams for explaining the operation of the toner remaining amount detection means, FIGS. 5 and 6 are explanatory diagrams for explaining the operation of the toner replenishment driving means of the developing device, and FIG. FIG. 8 is a schematic diagram of the entire internal structure of a laser printer equipped with the developing device. FIG. 9 is a cross-sectional diagram illustrating a conventional developing device. 16...Developing device 26...Toner supply chamber 26a...Hopper chamber 26b on the side closer to the developing roller... ...Hopper chamber 27 on the side far from the developing roller...Developing roller 28...Toner
Claims (1)
ともに、それら各ホッパ室内にそれぞれトナー補給手段
を設け、それら各トナー補給手段で順次それら各ホッパ
室を経てトナーを現像ローラへと送る電子写真装置の現
像装置において、前記複数のホッパ室のうち、前記現像
ローラに近い側のそれにトナー残量検知手段を設け、そ
のトナー残量検知手段で該ホッパ室内のトナー残量が一
定以下となったことを検知したとき、前記現像ローラに
遠い側の前記ホッパ室内における前記トナー補給手段を
駆動して前記現像ローラに近い側のホッパ室にトナーを
送り込むトナー補給駆動手段を備えてなる、 電子写真装置の現像装置。[Scope of Claims] The toner supply chamber is divided to form a plurality of hopper chambers, each of which is provided with a toner replenishment means, and each of the toner replenishment means sequentially passes through each of the hopper chambers and develops the toner. In the developing device of the electrophotographic apparatus, of the plurality of hopper chambers, a remaining toner amount detecting means is provided in one of the plurality of hopper chambers closer to the developing roller, and the remaining toner amount detecting means detects the remaining amount of toner in the hopper chamber. and a toner replenishment drive means for driving the toner replenishment means in the hopper chamber on the side far from the developing roller to feed the toner into the hopper chamber on the side closer to the developing roller when it is detected that the toner has become below a certain level. A developing device for electrophotographic equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1024503A JP2875271B2 (en) | 1989-02-02 | 1989-02-02 | Developing device for electrophotographic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1024503A JP2875271B2 (en) | 1989-02-02 | 1989-02-02 | Developing device for electrophotographic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02204763A true JPH02204763A (en) | 1990-08-14 |
| JP2875271B2 JP2875271B2 (en) | 1999-03-31 |
Family
ID=12139998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1024503A Expired - Lifetime JP2875271B2 (en) | 1989-02-02 | 1989-02-02 | Developing device for electrophotographic equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2875271B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04343378A (en) * | 1991-05-20 | 1992-11-30 | Mita Ind Co Ltd | Toner supplying device |
-
1989
- 1989-02-02 JP JP1024503A patent/JP2875271B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04343378A (en) * | 1991-05-20 | 1992-11-30 | Mita Ind Co Ltd | Toner supplying device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2875271B2 (en) | 1999-03-31 |
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