JP2992827B2 - Bias voltage / transfer current controller - Google Patents
Bias voltage / transfer current controllerInfo
- Publication number
- JP2992827B2 JP2992827B2 JP2045878A JP4587890A JP2992827B2 JP 2992827 B2 JP2992827 B2 JP 2992827B2 JP 2045878 A JP2045878 A JP 2045878A JP 4587890 A JP4587890 A JP 4587890A JP 2992827 B2 JP2992827 B2 JP 2992827B2
- Authority
- JP
- Japan
- Prior art keywords
- recording paper
- transfer
- paper
- bias voltage
- fixing
- 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
Landscapes
- Developing For Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Control Or Security For Electrophotography (AREA)
- Counters In Electrophotography And Two-Sided Copying (AREA)
- Paper Feeding For Electrophotography (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、複写機，ファクシミリ装置，プリンタ等に
用いられ、バイアス電圧によりトナー供給量を制御する
現像装置及びコロナ放電により転写を行う転写装置等の
バイアス電圧・転写電流制御装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a copying machine, a facsimile machine, a printer, and the like, and a developing device that controls a toner supply amount by a bias voltage and a transfer device that performs transfer by corona discharge. And a bias voltage / transfer current control device.
（従来の技術） 従来、乾式トナーを用いた装置において転写後の画像
濃度を一定に保つものとして、実開昭63−157768号公報
記載の原稿の濃度によりバイアス電圧を制御するもの、
及び特公昭62−3423号公報記載の転写部材表面電圧を検
知して転写電圧が一定になるように制御しているもので
ある。(Prior Art) Conventionally, in a device using a dry toner, as a device for maintaining a constant image density after transfer, a device in which a bias voltage is controlled by the density of a document described in Japanese Utility Model Application Laid-Open No. 63-157768,
In addition, a transfer member surface voltage described in Japanese Patent Publication No. Sho 62-3423 is detected to control the transfer voltage to be constant.
（発明が解決しようとする課題） しかしながら、上記従来の方法は記録紙の平滑性に基
づいて制御するものではない。(Problems to be Solved by the Invention) However, the above-mentioned conventional method does not perform control based on the smoothness of recording paper.
乾式トナーを用いたプリンター等の画像濃度が紙の性
質に影響を受けることは一般に知られているところであ
るが、紙の平滑性においても同様のことが言える。It is generally known that the image density of a printer or the like using a dry toner is affected by the properties of paper, but the same can be said for the smoothness of paper.
凹凸の大きい紙に対しては特に凹部で感光ドラムと距
離が遠くなるため、トナー像が紙に転写しにくくなり、
画像濃度がうすくなったり、または転写不良による濃度
むら等も発生しやすい。特に両面プリント時は、一度定
着装置を透過した記録紙は紙に含まれた水分が定着熱に
より蒸発されるため、含水量の高い記録紙は凹凸量が大
きくなるので、この傾向が増大する。For paper with large irregularities, the distance from the photosensitive drum is particularly long in the concave portion, so that the toner image is difficult to be transferred to the paper,
The image density tends to be low, or uneven density due to poor transfer tends to occur. In particular, at the time of double-sided printing, since the moisture contained in the recording paper once evaporated through the fixing device is evaporated by the fixing heat, the recording paper having a high water content has a large amount of irregularities, and this tendency is increased.
本発明は、上記従来の問題を解決するものであり、両
面プリントの際に紙に凹凸が生じても、画像濃度がうす
くなったり、濃度むら等の発生しないバイアス電圧・転
写電流制御装置を提供することを目的とするものであ
る。SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a bias voltage / transfer current control device that does not cause a decrease in image density or uneven density even when irregularities occur on paper during double-sided printing. It is intended to do so.
（課題を解決するための手段） 本発明は上記目的を達成するために、次の何れかの手
段を備えたものである。(Means for Solving the Problems) In order to achieve the above object, the present invention includes any of the following means.
（１）両面搬送装置における定着装置を一度通過した後
の記録紙の搬送路に記録紙の平滑量検知センサを設け、
平滑量検知センサの出力に応じて現像バイアス付勢手段
を制御するようにしたものである。(1) A sensor for detecting the smoothness of the recording paper is provided in the conveyance path of the recording paper once passed through the fixing device in the double-sided conveyance device,
The developing bias urging means is controlled in accordance with the output of the smoothing amount detection sensor.
（２）両面搬送装置における定着装置を一度通過した後
の記録紙の搬送路に記録紙の平滑量検知センサを設け、
平滑量検知センサの出力に応じて転写装置における転写
電流を制御するようにしたものである。(2) A sensor for detecting the smoothness of the recording paper is provided in the conveyance path of the recording paper once passed through the fixing device in the double-sided conveyance device,
The transfer current in the transfer device is controlled according to the output of the smoothing amount detection sensor.
（作 用） したがって、本発明によれば、両面搬送装置におい
て、 （１）平滑量検知センサで紙の凹凸を検知し、現像バイ
アス付勢手段の制御、即ちトナーの供給量を制御するこ
とにより画像濃度がうすくなったり、濃度むら等の発生
がなくなる。(Operation) Therefore, according to the present invention, in the two-sided conveying device, (1) detecting the unevenness of the paper by the smoothness detecting sensor and controlling the developing bias urging means, that is, controlling the toner supply amount; Eliminating image density and uneven density is eliminated.
（２）平滑量検知センサで紙の凹凸を検知し、転写電流
を制御することにより画像濃度がうすくなったり、濃度
むら等の発生がなくなる。(2) The unevenness of the paper is detected by the smoothing amount detection sensor and the transfer current is controlled, so that the image density does not become light and the density unevenness does not occur.
（実施例） 第１図はプリンターの一例の構成を示したものであ
る。第１図において、１は給紙装置、２は記録紙、３は
レジストローラ対、４は感光体、５は帯電チャージャ、
６はレーザ光学系、７は現像装置、８は転写・分離チャ
ージャ、９は定着装置、10は排紙部、11はクリーニング
装置、12はプリンタ本体である。FIG. 1 shows an example of the configuration of a printer. In FIG. 1, 1 is a paper feeder, 2 is a recording paper, 3 is a pair of registration rollers, 4 is a photoconductor, 5 is a charger,
Reference numeral 6 denotes a laser optical system, 7 denotes a developing device, 8 denotes a transfer / separation charger, 9 denotes a fixing device, 10 denotes a paper discharge unit, 11 denotes a cleaning device, and 12 denotes a printer body.
次に上記プリンタの動作について説明する。第１図に
おいて、プリンタ本体12には給紙カセットが着脱自在に
装填される。給紙装置１から矢印Ａ方向に給紙された記
録紙２は、レジストローラ対３によってタイミングをと
られてドラム上の感光体４からなる潜像担持体へ搬送さ
れる。感光体４は反時計方向に回転駆動され、その際、
帯電チャージャ５によって表面を帯電され、レーザ光学
系６からのレーザ光（Ｌ）を照射されて感光体上に静電
潜像が形成される。この潜像は現像装置７を通るときト
ナーによって可視像化される。この可視像は転写・分離
チャージャ８により、感光体４へ搬送された記録紙２に
転写され、感光体４に密着した記録紙２は静電的に分離
させられる。その後、記録紙２は定着装置９に搬送され
定着装置９により記録紙２上の可視像は定着され、矢印
Ｂ方向に排紙部10へ排出される。一方、可視像転写後の
感光体４はクリーニングブレードを有するクリーニング
装置11によって残留トナーを除去され、除去されたトナ
ーはクリーニング装置11に回収される。Next, the operation of the printer will be described. In FIG. 1, a paper cassette is detachably loaded into the printer body 12. The recording paper 2 fed in the direction of arrow A from the paper feeding device 1 is conveyed to a latent image carrier composed of a photoconductor 4 on a drum at a timing by a pair of registration rollers 3. The photoreceptor 4 is driven to rotate counterclockwise.
The surface is charged by the charging charger 5 and is irradiated with laser light (L) from the laser optical system 6 to form an electrostatic latent image on the photoconductor. This latent image is visualized by toner when passing through the developing device 7. This visible image is transferred to the recording paper 2 conveyed to the photoconductor 4 by the transfer / separation charger 8, and the recording paper 2 in close contact with the photoconductor 4 is electrostatically separated. Thereafter, the recording paper 2 is conveyed to the fixing device 9, the visible image on the recording paper 2 is fixed by the fixing device 9, and is discharged to the paper discharge unit 10 in the direction of arrow B. On the other hand, the residual toner is removed from the photoconductor 4 after the transfer of the visible image by a cleaning device 11 having a cleaning blade, and the removed toner is collected by the cleaning device 11.
第２図は本発明の実施例における第１の平滑量検知装
置を示したものであり、第２図（ａ）は第１の平滑量検
知装置の概略を示し、第２図（ｂ）は第１の平滑量検知
装置を両面印字可能な装置における両面搬送装置に設け
た場合を示している。第２図において、22は検出針、23
はレコードプレーヤ等のピックアップに利用されている
公知のムービングコイルであって、検出針22に伝わった
振動の幅は紙の凹凸量として電気信号に変換され制御部
へ送られる。FIG. 2 shows a first smoothing amount detecting device according to an embodiment of the present invention. FIG. 2 (a) schematically shows the first smoothing amount detecting device, and FIG. The case where the first smoothing amount detection device is provided in a double-sided conveyance device in a device capable of performing double-sided printing is shown. In FIG. 2, 22 is a detection needle, 23
Is a known moving coil used for a pickup of a record player or the like, and the width of the vibration transmitted to the detection needle 22 is converted into an electric signal as an unevenness of the paper and sent to the control unit.
第３図は本発明の実施例における第２の平滑量検知装
置を示したものであり、第３図（ａ）は第２の平滑量検
知装置の概略を示し、第３図（ｂ）は第２の平滑量検知
装置を両面印字可能な装置における両面搬送装置に設け
た場合を示している。第３図において、24は微小スポッ
ト型の反射型光電センサであって、反射型光電センサ24
から記録紙２への距離を示す信号のうち高周波成分が紙
の凹凸量として電気信号に変換され制御部に送られる。FIG. 3 shows a second smoothing amount detecting device according to the embodiment of the present invention. FIG. 3 (a) schematically shows the second smoothing amount detecting device, and FIG. 3 (b) shows the second smoothing amount detecting device. The case where the second smoothing amount detecting device is provided in a double-sided conveying device in a device capable of performing double-sided printing is shown. In FIG. 3, reference numeral 24 denotes a minute spot type reflection type photoelectric sensor.
The high-frequency component of the signal indicating the distance from the recording paper 2 to the recording paper 2 is converted into an electric signal as the amount of irregularities of the paper and sent to the control unit.
第４図は本発明の実施例におけるバイアス電圧・電流
制御装置の回路ブロックを示したものである。第４図に
おいて、31は検出針とムービングコイルからなるレコー
ドプレーヤ型平滑量検知装置、32は反射型光電センサか
らなる平滑量検知装置、33は制御装置、34は高圧電源で
あり、平滑量検知装置31または32において記録紙の凹凸
量を検出し電気信号に変換されて制御部33に送られ、制
御部33から高圧電源34に対してバイアス電圧の制御また
は転写電流の制御指令を送って高圧電源34を制御する。
上記動作を第５図及び第６図に示す。第５図はバイアス
電圧を制御する本発明の第１の実施例の場合であり、平
滑量検知装置で紙の平滑量を検知して凹凸量を示す電気
信号に変換して制御部に送る（S1,S2）。制御部は転写
不良が始まる時の凹凸量を示す基準値と比較し（S3）、
基準値より大きければ（凹凸が大きい）バイアス電圧を
増加させるように制御し、それによって現像装置におけ
るトナー供給量を増やす（S4,S5,S6）。また、基準値と
比較した時、基準値より小さければ（凹凸が小さい）バ
イアス電圧が一定になるように制御し、それによって現
像装置におけるトナー供給量が一定になる（S7,S8,
S9）。FIG. 4 shows a circuit block of the bias voltage / current control device according to the embodiment of the present invention. In FIG. 4, reference numeral 31 denotes a record player type smoothness detecting device including a detecting needle and a moving coil; 32, a smoothing amount detecting device including a reflection type photoelectric sensor; 33, a control device; The device 31 or 32 detects the amount of unevenness of the recording paper, converts it into an electric signal, and sends it to the control unit 33.The control unit 33 sends a bias voltage control or a transfer current control command to the high voltage power supply 34, thereby The power supply 34 is controlled.
The above operation is shown in FIG. 5 and FIG. FIG. 5 shows a case of the first embodiment of the present invention in which the bias voltage is controlled. The smoothing amount detecting device detects the smoothing amount of the paper, converts it into an electric signal indicating the unevenness amount, and sends it to the control unit ( S 1, S 2). The control unit compares it with a reference value indicating the amount of unevenness when the transfer failure starts (S 3 ),
Larger than the reference value (unevenness is large) controls to increase the bias voltage, thereby increasing the toner supply amount in the developing device (S 4, S 5, S 6). Moreover, when compared with a reference value, is smaller than the reference value (unevenness is small) controlled to the bias voltage is constant, the toner supply amount in the developing apparatus is constant whereby (S 7, S 8,
S 9).
第６図は転写電流を制御する本発明の第２の実施例の
場合であり、平滑量検知装置で紙の平滑量を検知して凹
凸量を示す電気信号に変換して制御部に送る。制御部は
転写不良が始まる時の凹凸量を示す基準値と比較し
（S3）、基準値より大きければ（凹凸が大きい）転写装
置における転写電流を増加させるように制御し、チャー
ジャの転写率を増やす（S4,S11,S12）。また、記述値と
比較した時、基準値より小さければ（凹凸が小さい）転
写電流が一定になるように制御し、それによって転写率
が一定になる（S7,S13,S14）。FIG. 6 shows a case of the second embodiment of the present invention for controlling the transfer current. The smoothing amount detecting device detects the smoothing amount of the paper, converts it into an electric signal indicating the amount of unevenness, and sends it to the control unit. The controller compares with a reference value indicating the amount of unevenness when transfer failure starts (S 3 ), and if it is larger than the reference value (large unevenness), controls so as to increase the transfer current in the transfer device, and the transfer rate of the charger. (S 4 , S 11 , S 12 ). Moreover, when compared with the description value, smaller than the reference value (unevenness is small) controlled to transfer current is constant, the transfer rate becomes constant whereby (S 7, S 13, S 14).
（発明の効果） 本発明は上記実施例から明らかなように次の効果を有
する。即ち、両面搬送装置における定着装置を一度通過
した後の記録紙の搬送路において、 （１）紙の凹凸を検知し、トナーの供給量を制御するこ
とにより、紙の凹凸による画像濃度がうすくなったり、
濃度むら等の発生はなくなる。(Effects of the Invention) The present invention has the following effects, as is apparent from the above embodiment. That is, in the conveyance path of the recording paper once passed through the fixing device in the two-sided conveyance apparatus, (1) detecting the unevenness of the paper and controlling the supply amount of the toner, the image density due to the unevenness of the paper is reduced. Or
The occurrence of uneven density and the like is eliminated.
（２）紙の凹凸を検知し、転写電流を制御することによ
って、紙の凹凸による画像濃度がうすくなったり、濃度
むら等の発生はなくなる。(2) By detecting the unevenness of the paper and controlling the transfer current, the image density due to the unevenness of the paper and the occurrence of uneven density are eliminated.
第１図はプリンタの一例を示す断面図、第２図は本発明
の実施例におけるレコードプレーヤ型平滑量検知装置と
該装置を両面印刷のプリンタに設置した図、第３図は本
発明の実施例における反射型光電センサ平滑量検知装置
と該装置を両面印刷のプリンタに設置した図、第４図は
本発明の実施例におけるバイアス電圧・電流制御装置の
ブロック図、第５図は本発明の第１の実施例の動作を説
明する図、第６図は本発明の第２の実施例の動作を説明
する図である。 １……給紙装置、２……記録紙、３……レジストローラ
対、４……感光体、５……帯電チャージャ、６……レー
ザ光学系、７……現像装置、８……転写・分離チャージ
ャ、９……定着装置、10……排紙部、11……クリーニン
グ装置、12……プリンタ本体、22……検出針、23……ム
ービングコイル、24……反射型光電センサ、31,32……
平滑量検知装置、33……制御部、34……高圧電源。FIG. 1 is a cross-sectional view showing an example of a printer, FIG. 2 is a view showing a record player type smoothness detecting apparatus and an apparatus installed in a double-sided printer according to an embodiment of the present invention, and FIG. FIG. 4 is a block diagram of a bias voltage / current control device according to an embodiment of the present invention, and FIG. 5 is a block diagram of the present invention. FIG. 6 is a diagram for explaining the operation of the first embodiment, and FIG. 6 is a diagram for explaining the operation of the second embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Paper feeder, 2 ... Recording paper, 3 ... Registration roller pair 4, ... Photoconductor, 5 ... Charger, 6 ... Laser optical system, 7 ... Developing device, 8 ... Transfer Separation charger, 9 Fixing device, 10 Paper discharge unit, 11 Cleaning device, 12 Printer body, 22 Detection needle, 23 Moving coil, 24 Reflective photoelectric sensor, 31, 32 ……
Smoothing amount detection device 33 Control unit 34 High-voltage power supply.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) G03G 15/00 106 G03G 15/00 510 - 534 G03G 21/00 370 - 540 G03G 13/06 G03G 15/06 G03G 13/14 - 13/16 G03G 15/14 - 15/16 ──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. 6 , DB name) G03G 15/00 106 G03G 15/00 510-534 G03G 21/00 370-540 G03G 13/06 G03G 15/06 G03G 13/14-13/16 G03G 15/14-15/16
Claims (2)
するための現像バイアス付勢手段を含む現像装置と、可
視像化されたトナー像を記録紙上に転写し定着するため
の給紙装置，転写装置，定着装置を含む電子写真印刷装
置において、両面印刷のための両面搬送装置における定
着装置を一度通過した後の記録紙の搬送路に、記録紙の
平滑量検知センサを設けるとともに、前記平滑量検知セ
ンサの出力に応じて前記現像バイアス付勢手段を制御す
ることを特徴とするバイアス電圧・転写電流制御装置。A developing device including a developing bias urging means for visualizing an electrostatic latent image formed on a photoreceptor; and transferring and fixing the visualized toner image on recording paper. In the electrophotographic printing apparatus including the paper feeding device, the transfer device, and the fixing device for performing the printing, the smoothness of the recording paper is detected in the conveyance path of the recording paper after once passing through the fixing device in the duplex conveying device for the duplex printing. A bias voltage / transfer current control device comprising a sensor and controlling the developing bias urging means in accordance with an output of the smoothing amount detection sensor.
するための現像装置と、可視像化されたトナー像を記録
紙上に転写し定着するための給紙装置，転写装置，定着
装置を含む電子写真印刷装置において、両面印刷のため
の両面搬送装置における定着装置を一度通過した後の記
録紙の搬送路に、記録紙の平滑量検知センサを設けると
ともに、前記平滑量検知センサの出力に応じて前記転写
装置における転写電流を制御することを特徴とするバイ
アス電圧・転写電流制御装置。A developing device for visualizing the electrostatic latent image formed on the photoreceptor, a paper feeding device for transferring and fixing the visualized toner image on recording paper, In an electrophotographic printing apparatus including a transfer device and a fixing device, a recording paper smoothing amount detection sensor is provided in a conveyance path of the recording paper after once passing through a fixing device in a double-sided conveyance device for double-sided printing. A bias voltage / transfer current control device for controlling a transfer current in the transfer device according to an output of an amount detection sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2045878A JP2992827B2 (en) | 1990-02-28 | 1990-02-28 | Bias voltage / transfer current controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2045878A JP2992827B2 (en) | 1990-02-28 | 1990-02-28 | Bias voltage / transfer current controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03249673A JPH03249673A (en) | 1991-11-07 |
| JP2992827B2 true JP2992827B2 (en) | 1999-12-20 |
Family
ID=12731484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2045878A Expired - Fee Related JP2992827B2 (en) | 1990-02-28 | 1990-02-28 | Bias voltage / transfer current controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2992827B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8179447B2 (en) | 2007-03-16 | 2012-05-15 | Ricoh Company, Ltd. | Imaging apparatus having blur correction mechanism |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5246405B2 (en) * | 2008-10-02 | 2013-07-24 | 株式会社リコー | Image forming apparatus |
-
1990
- 1990-02-28 JP JP2045878A patent/JP2992827B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8179447B2 (en) | 2007-03-16 | 2012-05-15 | Ricoh Company, Ltd. | Imaging apparatus having blur correction mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03249673A (en) | 1991-11-07 |
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