JPH0434530Y2 - - Google Patents
Info
- Publication number
- JPH0434530Y2 JPH0434530Y2 JP1985008815U JP881585U JPH0434530Y2 JP H0434530 Y2 JPH0434530 Y2 JP H0434530Y2 JP 1985008815 U JP1985008815 U JP 1985008815U JP 881585 U JP881585 U JP 881585U JP H0434530 Y2 JPH0434530 Y2 JP H0434530Y2
- Authority
- JP
- Japan
- Prior art keywords
- transfer material
- transfer
- photoreceptor
- section
- guide plate
- 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
- 239000000463 material Substances 0.000 claims description 91
- 239000000123 paper Substances 0.000 claims description 8
- 108091008695 photoreceptors Proteins 0.000 description 30
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 241000519995 Stachys sylvatica Species 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Landscapes
- Paper Feeding For Electrophotography (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
Description
【考案の詳細な説明】
〈産業上の利用分野〉
本考案は、電子写真複写機における転写材を搬
送するための転写材案内装置に関するものであ
る。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a transfer material guide device for conveying a transfer material in an electrophotographic copying machine.
〈従来の技術〉
一般に電子写真複写装置においては、ドラム状
あるいは、ベルト状像担持体（感光体）表面に形
成された静電潜像を一成分あるいは二成分現像剤
によりトナー像として顕像となし、しかる後転写
材に転写する。転写手段としては、転写材を感光
体表面に密着させた後、該背面部より直流高圧の
印加された転写電極によるコロナ放電転写法が一
般に行なわれている。良好な転写を行なうために
は、感光体表面に転写材を適当圧力で確実に密着
させることが必要であり、更には感光体の周速と
転写材の移動速度が相対的に一致することが要求
される。前述の感光体と転写材の密着が不十分の
場合には、密着の良好な不十分な場所とで転写効
率がことなり、転写ムラが生じ、甚だしい場合に
は該部の転写が行なわれず、所謂、白ヌケ、画像
ずれ等の現像が起る。又感光体と転写材の相対速
度がことなると、その差分により転写トナー像の
乱れがおき良好なコピー画像は得られなくなる。
そこで、この種の装置においては、転写部手前の
転写材ガイド機構によつて、転写材の先端が感光
体の表面にある角度をもつて当接するようガイド
し、転写材自身の剛性、すなわち、こしの強さに
よつて転写材を感光体の表面に適当圧力で密着さ
せるようにしている。したがつて、最適な転写材
のこしの強さを生じさせるためには、転写材をガ
イドしている感光体の近傍に設けられた転写材案
内装置と感光体との相対位置が重要となる。この
ため転写材をガイドするための案内装置は、上下
ガイド板の間隔を狭くして、転写材の進入方向を
定めるように構成されている。ところが、均量の
軽い転写材（例えば、薄い転写紙）はこしが弱
く、均量の重い転写材（例えば、厚い転写紙、葉
書）はこしが強いという性質があるため、前者の
最適進入方向で後者の転写材を転写部に進入させ
ると、転写材の後端と転写材案内装置の上ガイド
板とが干渉して、ブレーキ現象がおき、そのため
感光体と転写材の相対速度が変り、転写材の先端
汚れ、又はトナー画像の乱れが起る。又、後者の
最適進入方向で前者の転写材を転写部に進入させ
ると、転写材のこしが弱いため、感光体との密着
力が減少し、転写不良が生ずるという問題があ
る。このため、転写材案内装置を回動しうる如く
構成し、こしの弱い転写材、あるいは、こしの強
い転写材に対し、夫々転写材の転写部への進入方
向が変化出来るように構成されたものがあるが、
該手段は、構成並びにその制御が複雑となり、前
記変化時の位置規制が困難であり、安定した転写
材の搬送が期待出来ないという問題がある。<Prior Art> Generally, in an electrophotographic copying apparatus, an electrostatic latent image formed on the surface of a drum-shaped or belt-shaped image carrier (photoreceptor) is developed as a toner image using a one-component or two-component developer. None, then transferred to transfer material. As a transfer means, a corona discharge transfer method is generally used in which a transfer material is brought into close contact with the surface of a photoreceptor, and then a transfer electrode is applied with a high DC voltage from the back surface of the photoreceptor. In order to perform good transfer, it is necessary to firmly bring the transfer material into close contact with the surface of the photoconductor with appropriate pressure, and furthermore, it is necessary that the circumferential speed of the photoconductor and the moving speed of the transfer material match relatively. required. If the adhesion between the photoreceptor and the transfer material described above is insufficient, the transfer efficiency will differ between areas with good adhesion and areas with insufficient adhesion, resulting in uneven transfer, and in extreme cases, transfer will not be performed in those areas. Development such as so-called white spots and image shift occurs. Furthermore, if the relative speeds of the photoreceptor and the transfer material differ, the difference causes disturbances in the transferred toner image, making it impossible to obtain a good copy image.
Therefore, in this type of device, a transfer material guide mechanism in front of the transfer section guides the leading edge of the transfer material so that it comes into contact with the surface of the photoreceptor at a certain angle, thereby increasing the rigidity of the transfer material itself. Depending on the strength of the strain, the transfer material is brought into close contact with the surface of the photoreceptor with an appropriate pressure. Therefore, in order to obtain the optimum stiffness of the transfer material, the relative position of the photoreceptor and the transfer material guide device provided near the photoreceptor that guides the transfer material is important. For this reason, the guide device for guiding the transfer material is configured to narrow the interval between the upper and lower guide plates to determine the direction in which the transfer material enters. However, because a uniform amount of light transfer material (e.g., thin transfer paper) has a weak stiffness, and a uniform amount of heavy transfer material (e.g., thick transfer paper, postcards) has a property of strong stiffness, the optimal approach direction for the former is When the latter transfer material enters the transfer section, the rear end of the transfer material interferes with the upper guide plate of the transfer material guide device, causing a braking phenomenon, which changes the relative speed of the photoreceptor and the transfer material. The leading edge of the transfer material becomes dirty or the toner image is disturbed. Furthermore, if the former transfer material enters the transfer section in the latter optimum direction, the stiffness of the transfer material is weak, resulting in reduced adhesion to the photoreceptor, resulting in poor transfer. For this reason, the transfer material guide device is configured to be rotatable, and the direction in which the transfer material enters the transfer section can be changed for weak transfer material or strong transfer material. There are things, but
This means has a problem in that the configuration and control thereof are complicated, it is difficult to regulate the position during the change, and stable conveyance of the transfer material cannot be expected.
〈考案が解決しようとする問題点〉
本考案は上述の問題点を解決するためなされた
ものでり、その目的とするところは、転写部へ転
写材を進入させる搬送ガイド部を改良して、転写
材の種類（こしの強さ、剛性）に影響されず、常
に良好な転写が得られる転写材案内装置の提供を
目的としたものである。<Problems to be solved by the invention> The present invention has been made to solve the above-mentioned problems, and its purpose is to improve the conveyance guide section that allows the transfer material to enter the transfer section, The object of the present invention is to provide a transfer material guide device that is not affected by the type of transfer material (strength of stiffness, rigidity) and can always provide good transfer.
〈問題点を解決するための手段〉
本考案は、上記目的を達成しようとするもの
で、転写材を搬送する上側及び下側のガイド板を
含む給紙搬送部と像担持体に形成された画像を転
写材の上面に転写する転写部とを有する複写機
の、前記給紙搬送部と前記転写部間で小型厚紙の
転写材が前記転写部に進入したとき、前記小型厚
紙の転写材の後端が転写材案内面により下方に湾
曲しないための上方向の逃げ面が前記上側のガイ
ド板の前記小型厚紙の転写材の給送面にのみ形成
されていることを特徴とした複写機の転写材案内
装置を提供するものである。<Means for Solving the Problems> The present invention aims to achieve the above object. When a small cardboard transfer material enters the transfer section between the paper feed conveyance section and the transfer section of a copying machine having a transfer section that transfers an image onto the upper surface of the transfer material, the small cardboard transfer material A copying machine characterized in that an upward relief surface for preventing the rear end from curving downward due to the transfer material guide surface is formed only on the feeding surface of the small cardboard transfer material of the upper guide plate. A transfer material guiding device is provided.
〈実施例〉
第１図は、本考案を適用した一実施例であり、
電子写真複写装置の転写材搬送路と転写部の概要
を示す側断図、第２図は、転写材案内装置の要部
を示す斜視図、第３図は、転写材が感光体転写部
に進入する際の転写材案内装置に設けられ、上方
に逃げ面をもつ案内板と感光体との位置関係を示
す説明図である。<Example> Figure 1 shows an example to which the present invention is applied.
FIG. 2 is a side sectional view showing an outline of the transfer material conveyance path and transfer section of the electrophotographic copying device. FIG. 2 is a perspective view showing the main parts of the transfer material guide device. FIG. FIG. 6 is an explanatory diagram showing the positional relationship between a photoreceptor and a guide plate provided in the transfer material guide device and having an upper relief surface when entering the transfer material guide device.
１は感光体ドラムであり、図示されざる装置本
体側駆動機構により矢印方向に回転駆動する。感
光ドラム１は公知の電子写真プロセスにより、帯
電、露光、現像工程を経て、該感光ドラム１の周
面上には、トナー画像が顕像化されている。一
方、図示されざる給紙カセツト部より転写材Ｐが
給送され、感光体ドラム１の回転と同期どりされ
たレジストローラー２，２の回動により、所定の
タイミングで搬送され、後述に詳細の転写材案内
装置３，４あるいは６，４の案内により、感光体
ドラム１に進入する。該部には感光体ドラム１表
面に対向し、近接する如く配設された回動自在の
ローラー７があり、転写材Ｐは、感光体ドラム１
とローラー７に挟持され転写極８に進む。感光体
ドラム１に対向して配置された直流の高圧印加さ
れた転写極８のコロナ放電により、感光体ドラム
１上のトナー像は、転写材Ｐ上に転写される。次
いで、転写材Ｐは剥離器として交流高圧の印加さ
れた分離電極９のコロナ放電により感光体ドラム
１から剥離され、搬送ベルト１０により図示しな
い定着装置へ搬送され、転写材Ｐ上のトナー像の
定着がなされ機外に排出される。なお、補助給送
ローラー５は、小型サイズの転写材Ｐを感光体表
面に進入させるためのものであり、転写材Ｐが感
光体表面に密着する部位から補助給送ローラー５
迄の距離が、小型サイズ転写材の給送方向の長さ
とほゞ等しくなる位置に設けられている。この場
合、補助給送ローラーの部位に、レジストローラ
ー２，２を配置しても良いことは勿論である。補
助給送ローラー５について更に説明をする。補助
給送ローラー５は、図示されざる装置本体側駆動
機構により、該部に転写材Ｐが到達する時点か
ら、感光体ドラム１の転写部に進入させる迄時計
方向に回転駆動するように構成されている。な
お、補助給送ローラー５は、軸方向中央部に前記
転写材Ｐ（こしの強い小型サイズ紙）を搬送しう
る幅員で設けられ、かつ、転写材Ｐの後端部が該
ローラーより離れるときには、転写材Ｐの先端部
は感光体ドラム１と回動自在ローラー７間に挟持
される位置に配設される。転写材案内装置上ガイ
ド板３部には該ローラーの幅員相当分だけ一部さ
く孔されており、補助給送ローラー５は転写材案
内装置下ガイド板４と適当圧力で圧接し、該部に
到達した転写材Ｐを下ガイド板４と補助搬送ロー
ラー５の回動により、挟持搬送する。 Reference numeral 1 denotes a photosensitive drum, which is rotationally driven in the direction of the arrow by a drive mechanism on the apparatus main body side (not shown). The photosensitive drum 1 undergoes charging, exposure, and development steps by a known electrophotographic process, and a toner image is visualized on the circumferential surface of the photosensitive drum 1. On the other hand, a transfer material P is fed from a paper feed cassette section (not shown) and is transported at a predetermined timing by the rotation of registration rollers 2, 2 synchronized with the rotation of the photoreceptor drum 1. The transfer material enters the photosensitive drum 1 under the guidance of the transfer material guide devices 3, 4 or 6, 4. In this section, there is a rotatable roller 7 that is disposed so as to face and be close to the surface of the photoreceptor drum 1, and the transfer material P is transferred to the surface of the photoreceptor drum 1.
and is held between rollers 7 and advances to transfer pole 8. The toner image on the photoreceptor drum 1 is transferred onto the transfer material P by the corona discharge of the transfer pole 8 placed opposite to the photoreceptor drum 1 and to which a high DC voltage is applied. Next, the transfer material P is peeled off from the photoreceptor drum 1 by the corona discharge of the separation electrode 9 to which AC high voltage is applied as a peeler, and is conveyed to a fixing device (not shown) by the conveyor belt 10, where the toner image on the transfer material P is removed. It is fixed and discharged outside the machine. Note that the auxiliary feeding roller 5 is for allowing the small-sized transfer material P to enter the surface of the photoreceptor, and the auxiliary feeding roller 5
The distance therebetween is approximately equal to the length of the small size transfer material in the feeding direction. In this case, it goes without saying that the registration rollers 2, 2 may be arranged at the location of the auxiliary feeding roller. The auxiliary feeding roller 5 will be further explained. The auxiliary feeding roller 5 is configured to be rotated clockwise by a drive mechanism on the apparatus main body side (not shown) from the time when the transfer material P reaches the section until it enters the transfer section of the photosensitive drum 1. ing. The auxiliary feeding roller 5 is provided at the center in the axial direction with a width that can convey the transfer material P (stiff, small-sized paper), and when the rear end of the transfer material P leaves the roller, , the leading end of the transfer material P is disposed at a position where it is sandwiched between the photosensitive drum 1 and the rotatable roller 7. A hole corresponding to the width of the roller is formed in the upper guide plate 3 of the transfer material guide device, and the auxiliary feeding roller 5 is pressed against the lower guide plate 4 of the transfer material guide device with appropriate pressure, and the auxiliary feed roller 5 is pressed against the lower guide plate 4 of the transfer material guide device with appropriate pressure. The arrived transfer material P is pinched and transported by the rotation of the lower guide plate 4 and the auxiliary transport roller 5.
今、こしの強い小型サイズの転写材Ｐが図示右
側より搬送され、次いで補助給送ローラー５と下
ガイド板４とで感光体ドラム１の転写部に送り込
まれる。この状態が第３図一点鎖線P1で示され
ている。転写部に送り込まれた転写材は、感光体
ドラム１と回動自在ローラー７に挟持され、感光
体表面に密着しながら更に進む。この際転写材Ｐ
の後端は補助搬送ローラー５から離れ、転写材の
後端には自身のこしの強さにより上方向の力が作
用する。第２図に示す如く上ガイド板には凸状に
形成された逃げ面として上ガイド板６が設けられ
ているので、転写材Ｐの後端部は上ガイド板の干
渉をうけずに図示Ｐ２からＰ３に進むことがで
き、転写材Ｐの搬送を妨げることがない。すなわ
ち、こしの強い転写材Ｐを給送する場合でも感光
体ドラム１に無理な押圧力を生ずることがなく、
感光体ドラムの表面を傷めたり、ガイド板との干
渉による搬送速度の変化によるトナー像の乱れ、
あるいは転写材Ｐの転写部進入時の感光体と転写
材とのスリツプによる転写材先端汚れ等がおこら
ない。 Now, a stiff, small-sized transfer material P is conveyed from the right side in the figure, and then fed into the transfer section of the photosensitive drum 1 by the auxiliary feeding roller 5 and the lower guide plate 4. This state is shown by the dash-dotted line P1 in FIG. The transfer material sent into the transfer section is held between the photoreceptor drum 1 and the rotatable roller 7, and further advances while being in close contact with the surface of the photoreceptor. At this time, the transfer material P
The rear end of the transfer material is separated from the auxiliary conveyance roller 5, and an upward force is applied to the rear end of the transfer material due to its own strain strength. As shown in FIG. 2, the upper guide plate 6 is provided as a relief surface formed in a convex shape on the upper guide plate, so that the rear end of the transfer material P is not interfered with by the upper guide plate. The process can proceed from P3 to P3, and conveyance of the transfer material P is not hindered. That is, even when feeding a stiff transfer material P, no unreasonable pressing force is generated on the photoreceptor drum 1.
Damage to the surface of the photoreceptor drum or disturbance of the toner image due to changes in conveyance speed due to interference with the guide plate,
Further, when the transfer material P enters the transfer section, the tip of the transfer material is not contaminated due to slipping between the photoreceptor and the transfer material.
なお、本実施例では、補助給送ローラー５の設
置位置は転写体Ｐが感光体表面に密着する部位か
らの転写体の給送方向の長さとほぼ等しい位置と
しているが、上記の位置より、より感光体表面に
近接した位置に設けることも可能であつて、この
ような条件にあつても上ガイド板３に設けた逃げ
面は有効であつて、転写材の上方に弓状に彎曲す
る空間として作用し、感光体表面に適度の密着を
保持しながら転写がなされる逃げ面の効果があ
る。このような感光体表面に近接した位置に補助
給送ローラー５を設けたときは、回動自在ローラ
ー７を省略することが可能である。 In this embodiment, the installation position of the auxiliary feeding roller 5 is approximately equal to the length in the feeding direction of the transfer body from the part where the transfer body P comes into close contact with the surface of the photoreceptor. It is also possible to provide the upper guide plate 3 at a position closer to the surface of the photoreceptor, and even under such conditions, the relief surface provided on the upper guide plate 3 is effective and curves in an arch shape above the transfer material. It acts as a space and has the effect of a relief surface on which transfer is performed while maintaining appropriate adhesion to the surface of the photoreceptor. When the auxiliary feeding roller 5 is provided at a position close to the surface of the photoreceptor, the rotatable roller 7 can be omitted.
又、補助ローラー５部位にレジストローラー
２，２を配置する場合には、レジストローラー
２，２を軸方向に串型状になし、こしの強い小型
サイズ紙の幅員に対応するローラーは他部ローラ
ーよりゴム硬度を低くするか、あるいは、ローラ
ー外径を少し小さくするように構成することが望
ましい。 In addition, when the registration rollers 2, 2 are arranged in the auxiliary roller 5 section, the registration rollers 2, 2 are shaped like a skewer in the axial direction, and the roller corresponding to the width of the stiff small-sized paper is placed on the other roller. It is desirable to lower the rubber hardness or to make the outer diameter of the roller a little smaller.
〈考案の効果〉
以上、説明したように本考案によれば、感光体
と転写材案内装置との相対位置が固設でき、こし
の弱い転写材にはガイド板間隔を挾くし、かつ、
転写部進入時に転写材を彎曲させてこしを強くす
るようにして感光体に密着させ、こしの強い小型
サイズの転写材には、転写部進入時、転写材の後
端部と上ガイド板とが干渉しないようにガイド板
を凸状にし逃げ面を設けてあるのでこしの弱い転
写材の先端汚れ、あるいはこしの強い小型サイズ
の転写材の転写ズレ等が防止出来、常時きれいな
転写画像が得られる。<Effects of the invention> As explained above, according to the invention, the relative positions of the photoreceptor and the transfer material guide device can be fixed, and the guide plate interval can be used for transfer materials with weak stiffness, and
When entering the transfer section, the transfer material is bent to make it stiffer so that it comes into close contact with the photoreceptor. The guide plate is convex and has a relief surface to prevent interference, which prevents dirt on the tip of weakly stiff transfer materials or misalignment of stiff small size transfer materials, resulting in always clean transferred images. It will be done.
第１図は、本考案を適用した一実施例であり、
電子写真複写装置の転写材搬送路と転写部の概要
を示す側断面図、第２図は転写材案内装置の要部
を示す斜視図、第３図は転写材が感光体転写部に
進入する際の転写材案内装置に設けられた上方逃
げ面と感光体との係接の位置関係を示す説明図で
ある。
１……感光体ドラム、２……レジストローラ
ー、３……転写材案内装置上ガイド板、４……転
写材案内装置下ガイド板、５……補助給送ローラ
ー、６……上ガイド板、７……回動自在ローラ
ー、８……転写電極、９……分離電極、１０……
搬送ベルト、Ｐ……転写材。
FIG. 1 shows an embodiment to which the present invention is applied.
FIG. 2 is a side sectional view showing an overview of the transfer material conveyance path and transfer section of the electrophotographic copying device; FIG. 2 is a perspective view showing the main parts of the transfer material guide device; FIG. FIG. 3 is an explanatory diagram showing the positional relationship between the upper flank provided in the transfer material guide device and the photoconductor in engagement. DESCRIPTION OF SYMBOLS 1... Photosensitive drum, 2... Registration roller, 3... Transfer material guide device upper guide plate, 4... Transfer material guide device lower guide plate, 5... Auxiliary feeding roller, 6... Upper guide plate, 7... Rotatable roller, 8... Transfer electrode, 9... Separation electrode, 10...
Conveyor belt, P...transfer material.
Claims (1)
む給紙搬送部と像担持体に形成された画像を転写
材の上面に転写する転写部とを有する複写機の、
前記給紙搬送部と前記転写部間で小型厚紙の転写
材が前記転写部に進入したとき、前記小型厚紙の
転写材の後端が転写材案内面により下方に湾曲し
ないための上方向の逃げ面が前記上側のガイド板
の前記小型厚紙の転写材の給送面にのみ形成され
ていることを特徴とした複写機の転写材案内装
置。 A copying machine having a paper feed conveyance section including upper and lower guide plates for conveying a transfer material, and a transfer section for transferring an image formed on an image carrier onto the upper surface of the transfer material,
When the small cardboard transfer material enters the transfer section between the paper feed conveyance section and the transfer section, an upward clearance is provided to prevent the rear end of the small cardboard transfer material from being bent downward by the transfer material guide surface. A transfer material guide device for a copying machine, wherein a surface is formed only on a feeding surface of the small cardboard transfer material of the upper guide plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985008815U JPH0434530Y2 (en) | 1985-01-24 | 1985-01-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985008815U JPH0434530Y2 (en) | 1985-01-24 | 1985-01-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61126269U JPS61126269U (en) | 1986-08-08 |
| JPH0434530Y2 true JPH0434530Y2 (en) | 1992-08-17 |
Family
ID=30488449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985008815U Expired JPH0434530Y2 (en) | 1985-01-24 | 1985-01-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0434530Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6017766A (en) * | 1983-07-12 | 1985-01-29 | Fuji Xerox Co Ltd | Sheet carrying guide device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58180559U (en) * | 1982-05-26 | 1983-12-02 | 株式会社東芝 | Transfer device |
| JPS59112843U (en) * | 1983-01-15 | 1984-07-30 | カシオ計算機株式会社 | Transfer paper conveyance device |
-
1985
- 1985-01-24 JP JP1985008815U patent/JPH0434530Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6017766A (en) * | 1983-07-12 | 1985-01-29 | Fuji Xerox Co Ltd | Sheet carrying guide device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61126269U (en) | 1986-08-08 |
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