JPH0125061B2 - - Google Patents
Info
- Publication number
- JPH0125061B2 JPH0125061B2 JP5469680A JP5469680A JPH0125061B2 JP H0125061 B2 JPH0125061 B2 JP H0125061B2 JP 5469680 A JP5469680 A JP 5469680A JP 5469680 A JP5469680 A JP 5469680A JP H0125061 B2 JPH0125061 B2 JP H0125061B2
- Authority
- JP
- Japan
- Prior art keywords
- copy paper
- transfer
- potential
- conductive belt
- separation
- 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
Links
- 238000000926 separation method Methods 0.000 claims description 24
- 108091008695 photoreceptors Proteins 0.000 claims description 11
- 230000005684 electric field Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000013518 transcription Methods 0.000 description 1
- 230000035897 transcription Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/65—Apparatus which relate to the handling of copy material
- G03G15/6532—Removing a copy sheet form a xerographic drum, band or plate
- G03G15/6535—Removing a copy sheet form a xerographic drum, band or plate using electrostatic means, e.g. a separating corona
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Description
【発明の詳細な説明】
本発明は、電子写真複写機の転写・分離装置の
改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a transfer/separation device for an electrophotographic copying machine.
転写式の電子写真複写機は、感光体に形成した
静電潜像に吸着されているトナーを、転写電界を
印加することによつてコピー用紙側に吸引し、転
写を行なうが、この場合一般にコピー用紙が感光
体に吸着する。このコピー用紙を感光体から引剥
すのが分離装置であるが、この分離のための力を
静電的に与えるために、転写に際しコピー用紙に
電荷を注入し、転写後のコピー用紙を導体に接近
させて、前記電荷と導体に生じる誘導電荷との間
の静電吸引力を利用するものが提案されている。 Transfer-type electrophotographic copying machines apply a transfer electric field to attract the toner adsorbed on the electrostatic latent image formed on the photoreceptor to the copy paper side, and perform the transfer. Copy paper sticks to the photoconductor. A separating device separates the copy paper from the photoreceptor, and in order to electrostatically apply the force for this separation, an electric charge is injected into the copy paper during transfer, and the copy paper after transfer is made into a conductor. It has been proposed to make use of the electrostatic attractive force between the charges and the induced charges generated in the conductor by bringing them close to each other.
第１図は本発明の対象である前記装置を示すも
のである。１は感光体であつて矢印Ａ方向に回転
する。感光体１に形成された負極性の静電潜像２
には、正極性のトナー３が吸着している。この感
光体１の周面に向つて矢印Ｂで示すように送り込
まれるコピー用紙４は直流電圧の印加されたコロ
ナ放電器５によつて負の電荷を注入される。その
結果、トナー３はコピー用紙４に吸引され転写が
行なわれる。転写の済んだコピー用紙４は感光体
１の周面に吸着されて、導電性ベルト６の設置位
置へ進行する。導電性ベルト６は矢印Ｃで示すよ
うに走行しており、かつ、定電圧素子Ｚと抵抗
REを介して接地されている。したがつて、導電
性ベルト６にはコピー用紙４内の負電荷により正
電荷が、静電誘導によつて発生し、それら両電荷
の間に作用する静電吸引力によつてコピー用紙４
が導電性ベルト６に吸引されて分離が行なわれ
る。導電性ベルト６の電位は当初は零であるが、
コピー用紙４の接近に伴なつて上昇し、やがて、
定電圧素子Ｚで決定される電位（通常−600V程
度）に落着く。 FIG. 1 shows the device which is the subject of the invention. Reference numeral 1 denotes a photoreceptor, which rotates in the direction of arrow A. Negative electrostatic latent image 2 formed on photoreceptor 1
Toner 3 of positive polarity is adsorbed to. Copy paper 4, which is fed toward the circumferential surface of photoreceptor 1 as shown by arrow B, is injected with a negative charge by corona discharger 5 to which DC voltage is applied. As a result, the toner 3 is attracted to the copy paper 4 and transferred. The copy paper 4 that has been transferred is attracted to the circumferential surface of the photoreceptor 1 and advances to a position where the conductive belt 6 is installed. The conductive belt 6 is running as shown by the arrow C, and is connected to the constant voltage element Z and the resistor.
R is grounded through E. Therefore, a positive charge is generated on the conductive belt 6 due to the negative charge in the copy paper 4 due to electrostatic induction, and the electrostatic attraction force acting between these two charges causes the copy paper 4 to be
is attracted to the conductive belt 6 and separation is performed. The potential of the conductive belt 6 is initially zero, but
It rises as the copy paper 4 approaches, and eventually,
The potential settles to the potential determined by the constant voltage element Z (usually around -600V).
ところで、導電性ベルト６の電位は、転写及び
分離性能に大きな影響を与える。すなわち、該電
位が零であれば分離性能は充分なものとなるが、
その反面、コピー用紙４側へのトナー３の吸引力
が不足し、トナー３が感光体１側へ再転写するた
め転写性能が低下する。また、該電位が高い場合
には分離性能が低下し分離性不能になる。この相
反する二つの問題は導電性ベルト６の電位の時間
的な変化により、一応解消したかに考えられる。
すなわち、抵抗REを接続することにより、コピ
ー用紙４の到来以前においては、導電性ベルト６
の電位を零にしておき、分離性能を高めておく。
その結果、コピー用紙４の始端部においては転写
性能を擬牲にして分離が行なわれる。コピー用紙
４の導電性ベルト６への接触面積の増大に伴なつ
て、導電性ベルト６の電位は上昇し、やがて、定
電圧素子Ｚで決定される電位に落着くが、この電
位上昇により転写性能は回復する。また、コピー
用紙４の導電性ベルト６への吸着力は電位上昇に
伴なつて低下するが、コピー用紙４の始端部が吸
着された以後は、吸着力が低下しても吸着状態を
維持することはできるので、分離を続行すること
ができる。 Incidentally, the potential of the conductive belt 6 has a great influence on transfer and separation performance. In other words, if the potential is zero, the separation performance is sufficient, but
On the other hand, the suction force of the toner 3 to the copy paper 4 side is insufficient, and the toner 3 is retransferred to the photoreceptor 1 side, resulting in a decrease in transfer performance. In addition, when the potential is high, the separation performance decreases and separation becomes impossible. It is thought that these two contradictory problems have been temporarily resolved by the temporal change in the potential of the conductive belt 6.
That is, by connecting the resistor R E , the conductive belt 6 can be connected before the arrival of the copy paper 4.
Keep the potential at zero to improve separation performance.
As a result, separation is performed at the leading edge of the copy paper 4 by imitating the transfer performance. As the contact area of the copy paper 4 with the conductive belt 6 increases, the potential of the conductive belt 6 increases and eventually settles down to the potential determined by the constant voltage element Z. Performance will be restored. Further, the adsorption force of the copy paper 4 to the conductive belt 6 decreases as the potential increases, but after the starting edge of the copy paper 4 is adsorbed, the adsorption state is maintained even if the adsorption force decreases. Since this is possible, the separation can proceed.
以上のようにして、転写と分離の両機能を両立
させることができるかに考えられるが、これは必
ずしも予想通りの結果を与えない。すなわち、コ
ピー用紙４の材質、サイズ、環境条件によつて
は、転写或は分離機能が充分でない場合がある。 It may be possible to achieve both transcription and separation functions in the manner described above, but this does not necessarily give the expected results. That is, depending on the material, size, and environmental conditions of the copy paper 4, the transfer or separation function may not be sufficient.
第２図は、前記転写・分離装置の等価回路を示
すものであつて、
C1（ｔ）はコピー用紙４*と導電性ベルト６間
の静電容量
C2（ｔ）はコピー用紙４*と感光体１間の静電
容量
C3（ｔ）は導電性ベルト６と感光体１間の静電
容量（但し転写紙のはさまつていない部分）
CZは定電圧素子Ｚの静電容量
RZは定電圧素子Ｚの抵抗
（正確にはコピー用紙４中の電荷の位置）
をそれぞれ示し、Ｖ（ｔ）は導電性ベルト６の電
位を示す。また、−Ｑ（ｔ）は、コピー用紙４の帯
電量を示す。なお（ｔ）は、それを付した量が時
間の関数であることを示している。この等価回路
から明らかなように、導電性ベルト６の電位Ｖ
（ｔ）は、CR回路の充電によつて得られるもので
あり、C1，C2，C3は前記の原因によつて変動す
るので、電位Ｖ（ｔ）の立上り特性も変動する。
その結果転写・分離両性能に影響を与えるものと
考えられる。また、コピー用紙４の帯電量−Ｑ
（ｔ）の時間的変化割合は、わずかのものである
ので、電位Ｖ（ｔ）の立上り時間が長くなり、そ
の間転写不足が生じる。 FIG. 2 shows an equivalent circuit of the transfer/separation device, where C 1 (t) is the capacitance between the copy paper 4 * and the conductive belt 6, C 2 (t) is the capacitance between the copy paper 4 * C 3 (t) is the capacitance between the conductive belt 6 and the photoconductor 1 (the part of the transfer paper that is not sandwiched between them) C Z is the electrostatic capacitance of the constant voltage element Z The capacitance R Z indicates the resistance of the constant voltage element Z (more precisely, the position of the charge in the copy paper 4), and V(t) indicates the potential of the conductive belt 6. Further, -Q(t) indicates the amount of charge on the copy paper 4. Note that (t) indicates that the quantity to which it is attached is a function of time. As is clear from this equivalent circuit, the potential V of the conductive belt 6
(t) is obtained by charging the CR circuit, and since C 1 , C 2 , and C 3 vary due to the above-mentioned causes, the rise characteristics of the potential V(t) also vary.
As a result, both transfer and separation performance are considered to be affected. Also, the amount of charge on copy paper 4 -Q
Since the rate of change over time of (t) is small, the rise time of the potential V(t) becomes long, and insufficient transfer occurs during this time.
前記の問題点を解消するために、第３図に示す
ように、定電圧素子Ｚと並列の抵抗REに代えて、
リレー接点Ｓを接続し、コピー用紙４の進行位置
に応動してリレー接点Ｓを一時的にオンにするこ
とが提案されている。すなわち、コピー用紙４が
導電性ベルト６に接近した際、リレー接点Ｓをオ
ンにして電位Ｖ（ｔ）を零にし、分離性能を高め、
分離が開始されればリレー接点Ｓをオフにする。
この場合は、抵抗REによるバイパス回路がない
ので、電位Ｖ（ｔ）の立上りは比較的速くなる。 In order to solve the above problem, as shown in Fig. 3, instead of the resistor R E in parallel with the constant voltage element Z,
It has been proposed to connect the relay contact S and temporarily turn on the relay contact S in response to the advancing position of the copy paper 4. That is, when the copy paper 4 approaches the conductive belt 6, the relay contact S is turned on to reduce the potential V(t) to zero to improve the separation performance.
When separation starts, relay contact S is turned off.
In this case, since there is no bypass circuit using the resistor R E , the potential V(t) rises relatively quickly.
しかし、電位Ｖ（ｔ）の上昇は、コピー用紙４
の帯電量−Ｑ（ｔ）によるものであり、その量は
ごくわずかであるため、電位Ｖ（ｔ）の立上り時
間の短縮には限度がある。そこで、さらに改良さ
れたのが第４図に示す回路である。すなわち、定
電圧素子Ｚに並列に外部電源Ｅと保護抵抗r1との
直列回路を接続する。外部電源Ｅはコピー用紙４
の帯電−Ｑ（ｔ）に協力して、導電性ベルト６の
電位Ｖ（ｔ）を上昇させるべく充電を行なうので、
その立上り時間を短縮することができる。 However, the increase in potential V(t)
This is due to the amount of charge -Q(t), and since that amount is very small, there is a limit to how much the rise time of the potential V(t) can be shortened. Therefore, the circuit shown in FIG. 4 has been further improved. That is, a series circuit of an external power source E and a protective resistor r1 is connected in parallel to the constant voltage element Z. External power supply E is copy paper 4
Since charging is performed to increase the potential V(t) of the conductive belt 6 in cooperation with the charging -Q(t) of
The rise time can be shortened.
この方式によると、コピー用紙４の帯電−Ｑ
（ｔ）を当てにしないので、その材質、サイズ、
環境等に影響されることがなくなる。 According to this method, the charge on the copy paper 4 -Q
Since we do not rely on (t), its material, size,
It is no longer affected by the environment, etc.
ところで、前記方式による導電性ベルト６の電
位Ｖ（ｔ）の変化をグラフに示すと、第５図にａ
で示すとおりとなる。同図ｂは、第１図に示す改
良前のもののグラフであり、それと比較して立上
り時間が短かいことが解る。しかし、このグラフ
ａからも明らかなように、電位Ｖ（ｔ）の変化が
急激であるため、コピー用紙４の始端部に生じる
転写抜けの部分の境界が明瞭になり、それが目立
つという欠点が生じる。 By the way, when the change in the potential V(t) of the conductive belt 6 according to the above method is shown in a graph, FIG.
As shown in . Figure b is a graph of the one before the improvement shown in Figure 1, and it can be seen that the rise time is shorter than that. However, as is clear from graph a, the change in potential V(t) is rapid, so the boundary of the transfer gap that occurs at the starting edge of the copy paper 4 becomes clear and conspicuous. arise.
本発明は、前記の欠点を解消することを目的と
するものであつて、第６図はその構成を示すもの
である。すなわち、前記回路に対してさらにコン
デンサＣと保護抵抗r2との直列回路を並列に接続
する。コンデンサＣの容量は一例として
0.0235μF、保護抵抗は50KΩとした。これは、前
記等価回路（第２図）中のコンデンサC1（ｔ），
C2（ｔ），C3（ｔ）に比し、一桁以上大なる値であ
るため、それらの変動に影響されることなく、電
位Ｖ（ｔ）の立上り特性を自由に決定することが
できる。したがつて、この立上り特性と、リレー
接点Ｓをオフにするタイミングとを適当に選定す
ることによつて、コピー用紙４の始端部における
転写抜けを目立たないようにすること及び、確実
な分離を行なうことができる。第５図にｃで示す
グラフは、本発明によるものの立上り特性の一例
を示すものであつて、同図ａに示すものよりは緩
やかになつている。また、リレー接点Ｓをオフに
するタイミングをコピー用紙４が導電性ベルト６
に接触する時刻０よりも以前に選び、接触開始時
には電位Ｖ（ｔ）がすでに200V近くになるように
してある。 The present invention aims to eliminate the above-mentioned drawbacks, and FIG. 6 shows its configuration. That is, a series circuit including a capacitor C and a protective resistor r2 is further connected in parallel to the circuit. As an example, the capacitance of capacitor C is
The protective resistance was 0.0235μF and 50KΩ. This is the capacitor C 1 (t) in the equivalent circuit (Fig. 2),
Since it is an order of magnitude larger than C 2 (t) and C 3 (t), it is possible to freely determine the rise characteristics of the potential V(t) without being affected by these fluctuations. can. Therefore, by appropriately selecting this rise characteristic and the timing for turning off the relay contact S, it is possible to make the transfer omission at the starting edge of the copy paper 4 less noticeable and to ensure reliable separation. can be done. The graph indicated by c in FIG. 5 shows an example of the rise characteristic of the device according to the present invention, and is gentler than the graph indicated by a in the figure. In addition, the copy paper 4 determines the timing for turning off the relay contact S by the conductive belt 6.
The potential V(t) is selected before the time 0 when contact is made, and the potential V(t) is already close to 200 V when contact starts.
本発明は以上のように、感光体上に形成した静
電潜像にトナーを吸着させ、その得られたトナー
による顕像を転写部において転写電界の印加のも
とにコピー用紙に転写し、次いでコピー用紙と導
電性の搬送部材間に静電吸引力を作用させて、該
コピー用紙を前記感光体から分離するように構成
した複写機の転写・分離装置に於て、前記搬送部
材に対して定電圧素子とスイツチを並列に接続
し、更に外部電源を含むＣ−Ｒ回路を接続したの
で、分離開始時における導電性搬送部材の電位を
低く抑えて、確実な分離性能を発揮させることが
でき、その後の電位上昇速度を外部直流電源と搬
送部材に接続したコンデンサとによつて自由に選
べるので、転写性能の回復をなめらかに行なうこ
とができ、転写抜けが目立たないようにすること
ができる。また、搬送部材の電位は主として外部
直流電源とコンデンサによつて決定され、変動要
因を含む浮遊容量（C1，C2，C3）を期待しない
ので、常に安定した転写性能及び分離性能を得る
ことができる。 As described above, the present invention allows toner to be attracted to an electrostatic latent image formed on a photoreceptor, and the resulting toner image is transferred to copy paper in a transfer section under the application of a transfer electric field, Next, in a transfer/separation device of a copying machine configured to apply an electrostatic attraction force between the copy paper and the conductive conveyance member to separate the copy paper from the photoreceptor, By connecting a constant voltage element and a switch in parallel, and further connecting a C-R circuit including an external power supply, it is possible to suppress the potential of the conductive conveying member at a low level at the start of separation and ensure reliable separation performance. The subsequent speed of potential rise can be freely selected by using the external DC power source and the capacitor connected to the conveyance member, so recovery of transfer performance can be performed smoothly and transfer omissions can be made less noticeable. . In addition, the potential of the conveying member is mainly determined by an external DC power supply and a capacitor, and stray capacitance (C 1 , C 2 , C 3 ) that includes fluctuation factors is not expected, so stable transfer performance and separation performance can always be obtained. be able to.
第１図は本発明の対象である転写・分離装置の
正面図、第２図はその等価回路図である。第３図
及び第４図は従来の改良手段を施したものの各回
路図、第５図は導電性ベルトの電位変化を示すグ
ラフであり、第６図は本発明の実施例の回路図で
ある。
１……感光体、２……静電潜像、３……トナ
ー、４……コピー用紙、５……コロナ放電器、６
……導電性ベルト、Ｃ……コンデンサ、Ｅ……外
部直流電源、Ｓ……リレー接点。
FIG. 1 is a front view of a transfer/separation device to which the present invention is applied, and FIG. 2 is an equivalent circuit diagram thereof. Figures 3 and 4 are circuit diagrams of the conventional improved means, Figure 5 is a graph showing changes in potential of the conductive belt, and Figure 6 is a circuit diagram of an embodiment of the present invention. . 1... Photoreceptor, 2... Electrostatic latent image, 3... Toner, 4... Copy paper, 5... Corona discharger, 6
...Conductive belt, C...Capacitor, E...External DC power supply, S...Relay contact.
Claims (1)
させ、その得られたトナーによる顕像を転写部に
おいて転写電界の印加のもとにコピー用紙に転写
し、次いでコピー用紙と導電性の搬送部材間に静
電吸引力を作用させて、該コピー用紙を前記感光
体から分離するように構成した複写機の転写・分
離装置に於て、前記搬送部材に対して定電圧素子
とスイツチを並列に接続し、更に外部電源を含む
Ｃ−Ｒ回路を接続してなる電子写真複写機の転
写・分離装置。1. Toner is attracted to the electrostatic latent image formed on the photoconductor, and the resulting toner image is transferred to copy paper in a transfer section under the application of a transfer electric field, and then the copy paper and conductive In a copying machine transfer/separation device configured to separate the copy paper from the photoreceptor by applying an electrostatic attraction force between the conveyance members, a constant voltage element and a switch are connected to the conveyance members. A transfer/separation device for an electrophotographic copying machine which is connected in parallel and further connected to a C-R circuit including an external power source.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5469680A JPS56150777A (en) | 1980-04-24 | 1980-04-24 | Transfer and separation apparatus of electrophotographic copying machine |
| US06/232,488 US4367032A (en) | 1980-03-27 | 1981-02-09 | Electrostatic copying apparatus |
| DE3111589A DE3111589C2 (en) | 1980-03-27 | 1981-03-24 | Device for transferring a toner image from a photoconductive element to a sheet-shaped image receiving material for an electrophotographic copier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5469680A JPS56150777A (en) | 1980-04-24 | 1980-04-24 | Transfer and separation apparatus of electrophotographic copying machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56150777A JPS56150777A (en) | 1981-11-21 |
| JPH0125061B2 true JPH0125061B2 (en) | 1989-05-16 |
Family
ID=12977958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5469680A Granted JPS56150777A (en) | 1980-03-27 | 1980-04-24 | Transfer and separation apparatus of electrophotographic copying machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56150777A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE201002T1 (en) * | 1993-02-04 | 2001-05-15 | Otsuka Pharma Co Ltd | MULTI-LAYER FILM AND CONTAINER |
| US6345168B1 (en) * | 2000-12-14 | 2002-02-05 | Xerox Corporation | Xerographic printer where DC bias is changed to zero during the transfer step |
| JP6516814B1 (en) * | 2017-11-09 | 2019-05-22 | キヤノン株式会社 | Image forming device |
-
1980
- 1980-04-24 JP JP5469680A patent/JPS56150777A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56150777A (en) | 1981-11-21 |
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