JP3072780B2 - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JP3072780B2 JP3072780B2 JP03034746A JP3474691A JP3072780B2 JP 3072780 B2 JP3072780 B2 JP 3072780B2 JP 03034746 A JP03034746 A JP 03034746A JP 3474691 A JP3474691 A JP 3474691A JP 3072780 B2 JP3072780 B2 JP 3072780B2
- Authority
- JP
- Japan
- Prior art keywords
- transfer material
- sheet
- transfer
- image forming
- connecting member
- 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
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Color Electrophotography (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、電子写真式或いは静電
記録式にて像担持体に形成した可視画像を転写装置にて
転写材に転写することにより画像を得る画像形成装置に
関するものであり、特に、複数の現像器を有し、像担持
体上に形成した潜像を現像し、そのトナー像を転写装置
により順次転写材に重ね転写して画像を得る多色画像形
成装置に好適に具現化し得るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus for obtaining an image by transferring a visible image formed on an image carrier by an electrophotographic or electrostatic recording method to a transfer material by a transfer device. Yes, particularly suitable for a multi-color image forming apparatus having a plurality of developing units, developing a latent image formed on an image carrier, and sequentially transferring the toner image onto a transfer material by a transfer device to obtain an image. It can be embodied in
【0002】〔背景技術〕従来、種々の多色画像形成装
置が提案され、又市販されているが、図6には代表的な
カラー電子写真複写機の一例が図示される。2. Description of the Related Art Conventionally, various multicolor image forming apparatuses have been proposed and are commercially available. FIG. 6 shows an example of a typical color electrophotographic copying machine.
【0003】図6において、カラー電子写真複写機は、
詳しくは後述するが、本例では電子写真感光ドラムとさ
れる像担持体1に潜像を形成し、該潜像を複数の、例え
ばイエロー、マゼンタ、シアン、ブラックの4個の現像
器132〜134を備えた回転現像装置13にて色トナ
ー像となし、これらトナー像を、感光ドラム1表面に近
接配置したドラム形状の転写装置5に取着した紙などの
シート状転写材に重畳転写してカラー画像を得る構成と
されている。In FIG. 6, a color electrophotographic copying machine is
As will be described in detail later, in this example, a latent image is formed on the image carrier 1 which is an electrophotographic photosensitive drum, and the latent image is formed into a plurality of developing units 132 to yellow, magenta, cyan, and black. The toner image is formed into a color toner image by the rotary developing device 13 provided with 134, and these toner images are superimposedly transferred onto a sheet-like transfer material such as paper attached to a drum-shaped transfer device 5 disposed close to the surface of the photosensitive drum 1. To obtain a color image.
【0004】このようなカラー電子写真複写機に使用さ
れる転写装置5としては、図7に略示するように、一対
の環状部材、本例では円筒状の部材5a、5bを同心的
に配して両者を連結部材5cによって一体的に結合し、
更に、全周にわたって、通常ポリエステルシートのよう
な誘電体材料で形成される転写材担持部材、即ち、担持
シート15で被覆して円筒状に形成した転写ドラムが使
用されている。As schematically shown in FIG. 7, a transfer device 5 used in such a color electrophotographic copying machine has a pair of annular members, in this example, cylindrical members 5a and 5b concentrically arranged. Then, both are integrally connected by the connecting member 5c,
Further, a transfer material supporting member usually formed of a dielectric material such as a polyester sheet, that is, a transfer drum formed in a cylindrical shape by covering with a supporting sheet 15 is used over the entire circumference.
【0005】更に、転写ドラム5の連結部材5cの外表
面には適所にグリッパ51を配し、感光ドラム1上のト
ナー像とタイミングを合せて供給される転写材を把持し
てこれを搬送し、転写帯電器24が配置された転写位置
にて感光ドラム1に近接する毎に各色のトナー像を転写
材に転写してカラー画像を形成したのち、グリッパ51
を開放して転写材を転写ドラムから分離する。分離され
た転写材は搬送手段29にて定着手段30へと送給され
る。Further, a gripper 51 is provided at an appropriate position on the outer surface of the connecting member 5c of the transfer drum 5, and the transfer material supplied in time with the toner image on the photosensitive drum 1 is gripped and transported. The toner image of each color is transferred to a transfer material each time the toner image approaches the photosensitive drum 1 at a transfer position where the transfer charger 24 is disposed, and a color image is formed.
Is released to separate the transfer material from the transfer drum. The separated transfer material is fed to the fixing unit 30 by the conveying unit 29.
【0006】又、従来、転写ドラム5においては、担持
シート15を均一にならすことと、転写ニップをかせぎ
転写効率を上げるために、転写帯電器24の近傍におい
て転写ドラム5の内側から感光ドラム1の方向へと担持
シート53を押し上げるために、図8〜図10に図示す
るように、バックアップ部材61が設けられている。こ
のバックアップ部材61はマイラー(商品名)等の可撓
性体で形成され、あるいは弾性体(ネジリコイルバネ
等)を介して固定された剛体等により適当な圧力を担持
シート15に与えている。Conventionally, in the transfer drum 5, in order to make the carrier sheet 15 uniform and to increase the transfer nip to increase the transfer efficiency, the photosensitive drum 1 is located near the transfer charger 24 from the inside of the transfer drum 5. As shown in FIGS. 8 to 10, a backup member 61 is provided to push up the support sheet 53 in the direction of FIG. The backup member 61 is made of a flexible material such as Mylar (trade name) or applies an appropriate pressure to the support sheet 15 by a rigid body fixed through an elastic body (such as a torsion coil spring).
【0007】[0007]
【発明が解決しようとしている課題】しかしながら、こ
のような構成の転写装置においては、転写材を担持する
転写ドラム5の移動により、図9のように連結部材51
を押圧するバックアップ部材61が、連結部材51から
抜けて図10のような状態になる瞬間にバックアップ部
材61は担持シート51を内側からたたいて衝撃を与え
る。この衝撃による振動は圧接された感光ドラム1を揺
らすため画像ブレを発生させるという問題があった。However, in the transfer apparatus having such a structure, the connection member 51 is moved as shown in FIG.
At the moment when the backup member 61 that presses the connection member 51 comes out of the connecting member 51 and becomes a state as shown in FIG. 10, the backup member 61 strikes the support sheet 51 from the inside and gives an impact. The vibration due to the impact shakes the pressed photosensitive drum 1 to cause image blurring.
【0008】〔発明の目的〕本発明は、上記の問題点に
鑑み成されたものであり、その目的はバックアップ部材
による転写材担持手段への衝撃を防止した画像形成装置
を提供することである。また、本発明の他の目的は、振
動を防止して画像ブレを発生させない画像形成装置を提
供することである。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an image forming apparatus in which a backup member prevents an impact on a transfer material carrying means. . Another object of the present invention is to provide an image forming apparatus that prevents vibration and prevents image blurring.
【0009】〔発明の構成〕 本発明は、転写材を担持する移動可能な転写材担持手段
であって、一対の環状部材と、前記一対の環状部材を連
結する連結部材と、前記一対の環状部材及び前記連結部
材により形成される開口部を覆い転写材を担持する転写
材担持シートと、を備える転写材担持手段と、前記転写
材担持シートの内側に設けられ前記転写材担持シートを
外側に向けて押圧する押圧部材と、を有し、像担持体上
の像を前記転写材担持シートに担持された転写材に転写
する画像形成装置において、前記転写材担持手段の移動
方向において前記連結部材の後端部に設けられ前記転写
材担持シートに接触可能な可撓性シートを有し、前記押
圧部材は、前記転写材担持手段の移動により、前記連結
部材から前記可撓性シートが前記転写材担持シートに接
触する位置を経て前記転写材担持シートに当接されるこ
とを特徴とするものである。[0009] The present invention is a movable transfer material holding means for holding a transfer material, comprising: a pair of annular members; a connecting member connecting the pair of annular members; A transfer material supporting means comprising: a transfer material supporting sheet that covers an opening formed by the member and the connecting member and supports a transfer material; and a transfer material supporting sheet provided inside the transfer material supporting sheet and having the transfer material supporting sheet disposed outside. A pressing member that presses the transfer member on the transfer member supporting sheet in a moving direction of the transfer material supporting unit. A flexible sheet provided at a rear end of the transfer member, the flexible member being capable of contacting the transfer material supporting sheet, and the pressing member is configured to transfer the flexible sheet from the connecting member by the movement of the transfer material supporting means. Material carrying The transfer material carrying sheet is brought into contact with the transfer material carrying sheet via a position where the transfer material carrying sheet is in contact with the sheet.
【0010】[0010]
【実施例】以下、本発明の画像形成装置を図面に基づい
て説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an image forming apparatus according to the present invention will be described with reference to the drawings.
【0011】図1に示すように、画像形成装置は、例え
ば円筒状の電子写真感光体などの像担持体1の回りに帯
電器31およびレーザ露光装置32を配置しており、こ
れらの帯電器31および露光装置32を用い、通常の電
子写真プロセスによって像担持体1上に現像剤の色に対
応した静電潜像がそれぞれ形成される。各静電潜像は、
現像剤として色の異なるトナーを有した現像ユニット3
3Y、33M、33C、および33Bからなる現像装置
33によって各々現像され、像担持体1上に1色ずつの
トナー像として顕像化される。As shown in FIG. 1, in the image forming apparatus, a charger 31 and a laser exposure device 32 are arranged around an image carrier 1 such as a cylindrical electrophotographic photosensitive member. An electrostatic latent image corresponding to the color of the developer is formed on the image carrier 1 by a normal electrophotographic process using the exposure device 31 and the exposure device 32. Each electrostatic latent image is
Developing unit 3 having different color toners as developer
Each of the toner images is developed by a developing device 33 including 3Y, 33M, 33C, and 33B, and is visualized on the image carrier 1 as a toner image of each color.
【0012】一方、転写紙等の転写材Pが、図示しない
カセットから供給手段34によって転写装置である転写
ドラム5に供給される。On the other hand, a transfer material P such as transfer paper is supplied from a cassette (not shown) to a transfer drum 5 as a transfer device by supply means 34.
【0013】転写ドラム5は、図7に示すように、同心
的に配置した少なくとも一対の前後の環状部であるフラ
ンジ部材5a、5bと、これらのフランジ部材5a、5
bを連結する連結部材である連結部材5cとを備えた剛
体の支持フレームと、そのフランジ部材5a、5bおよ
び連結部材5cを残して切り欠かれた円筒状開口部表面
を覆うように支持フレームで支持し、転写材Pを担持す
る誘電体フィルムからなる可撓性の転写担持部材である
転写材担持シート15とを有してなっている。また、本
実施例の転写ドラム5は、転写材Pを把持するグリッパ
51は設けられていてもいなくても良い。As shown in FIG. 7, the transfer drum 5 includes at least a pair of front and rear annular members 5a and 5b concentrically arranged, and these flange members 5a and 5b.
b, a rigid supporting frame including a connecting member 5c which is a connecting member for connecting b, and a supporting frame covering the cut-out cylindrical opening surface except for the flange members 5a, 5b and the connecting member 5c. And a transfer material carrying sheet 15 which is a flexible transfer carrying member made of a dielectric film supporting and supporting the transfer material P. Further, the transfer drum 5 of the present embodiment may or may not be provided with the gripper 51 for gripping the transfer material P.
【0014】転写材Pは、像担持体1上の画像形成タイ
ミングに同期して、転写材供給手段34のレジストロー
ラ対35により、転写ドラム5の転写材吸着位置へ搬送
される。転写ドラム5内には吸着帯電器36が配置して
あり、転写材Pを転写材担持シート15上に静電吸着さ
せる。上記吸着帯電器36の転写材担持シート15を挟
んだ対向位置には、対向電極となる接地した吸着導電ロ
ーラ37が配置してあり、転写材Pの吸着時の密着性を
増す効果を上げている。The transfer material P is conveyed to the transfer material suction position of the transfer drum 5 by the registration roller pair 35 of the transfer material supply means 34 in synchronization with the image forming timing on the image carrier 1. An adsorption charger 36 is arranged in the transfer drum 5 and electrostatically adsorbs the transfer material P onto the transfer material carrying sheet 15. A grounded conductive conductive roller 37 serving as a counter electrode is disposed at a position opposite to the adsorption charging device 36 with the transfer material carrying sheet 15 interposed therebetween, thereby increasing the effect of increasing the adhesion of the transfer material P during adsorption. I have.
【0015】転写材担持シート15上に吸着、担持され
た転写材Pは、転写ドラム5の回転移動に伴い像担持体
1に当接される。そして転写ドラム5内に配置された転
写手段である転写帯電器24によって、転写材担持シー
ト15の背面へトナーと反対極性の電荷を付与すること
により、像担持体1上のトナー像が転写材P上に転写さ
れる。また転写帯電器24の上流側にはバックアップ部
材61を配し、転写材担持シート15が均一に像担持体
30へ圧接されるように機能している。バックアップ部
材61はマイラ等の可撓性の誘電体シートからなり、転
写前の転写帯電器24による転写電荷を規制するために
転写帯電器24の放電領域内であって、転写ドラム5の
移動方向に対して順方向(バックアップ部材61の担持
シート15への接触部での担持シート15の接線のうち
接触部上流側の線とバックアップ部材61とのなす角α
が鋭角)となるように設けられている。The transfer material P adsorbed and carried on the transfer material carrying sheet 15 comes into contact with the image carrier 1 as the transfer drum 5 rotates. Then, a charge having a polarity opposite to that of the toner is applied to the back surface of the transfer material carrying sheet 15 by a transfer charger 24 which is a transfer means disposed in the transfer drum 5, so that the toner image on the image carrier 1 is transferred. Transcribed on P. A backup member 61 is disposed upstream of the transfer charger 24, and functions so that the transfer material carrying sheet 15 is uniformly pressed against the image carrier 30. The backup member 61 is made of a flexible dielectric sheet such as Mylar, and is located in the discharge area of the transfer charger 24 in order to regulate the transfer charge by the transfer charger 24 before the transfer, and the moving direction of the transfer drum 5. In the forward direction (the angle α formed between the backup member 61 and the line upstream of the contact portion among the tangent lines of the support sheet 15 at the contact portion of the backup member 61 with the support sheet 15).
Is an acute angle).
【0016】以上の現像、転写プロセスを複数色のトナ
ー像についてそれぞれ行うことにより、転写材P上に1
色毎のトナー像が順次多重転写され、転写材P上にカラ
ー画像が再現される。By performing the above-described development and transfer processes on toner images of a plurality of colors, respectively,
The toner images for each color are sequentially multiplex-transferred, and a color image is reproduced on the transfer material P.
【0017】以上のようにして複数色のトナー像が重畳
転写された転写材Pは、転写材担持シート15への吸着
力を弱めるために、シート15を挟んで対向配置してい
る一対の除電帯電器39によりAC除電され、分離爪4
0を転写材Pと転写材担持シート15との間に挿入する
ことにより、シート15から分離される。分離された転
写材Pは、熱定着器41に送られ、そこでトナー像は溶
融混色され、定着が行われたのち、図示しないトレーへ
と排出される。The transfer material P on which the toner images of a plurality of colors have been superimposedly transferred as described above is used as a pair of static eliminators disposed opposite to each other with the sheet 15 interposed therebetween in order to reduce the attraction force to the transfer material carrying sheet 15. The AC is removed by the charger 39, and the separation claw 4 is removed.
0 is inserted between the transfer material P and the transfer material carrying sheet 15 to be separated from the sheet 15. The separated transfer material P is sent to the heat fixing device 41, where the toner image is melt-mixed and color-fixed, and then discharged to a tray (not shown).
【0018】転写の終了した像担持体30は、表面の残
留トナーをクリーニング装置42で清掃されたのち、再
度カラー画像形成プロセスに供せられる。After the transfer, the image carrier 30 is cleaned by a cleaning device 42 to remove residual toner on the surface, and then subjected to the color image forming process again.
【0019】次に図2に本発明の画像形成装置の転写部
近傍の一例を示し、これについて説明する。連結部材5
cの転写ドラム5移動方向下流側端部にはテーパ部5c
1が設けられており、その内面はマイラ(商品名)から
なる緩衝用可撓性シート5dが貼り付けられている。可
撓性シート5d先端はシート15に接触するように貼り
付けられているためバックアップ部材61が転写ドラム
5の移動により連結部材5cを通過して担持シート15
へ衝突する時の段差はわずか可撓性シート5dの厚み分
(約0.1mm)となるので、前述したような画像ブレ
は全く発生しなくなる。また、可撓性シート5dを設け
ることで可撓性シート5dの担持シート15への衝撃を
防止するために、連結部材5cのテーパ部5c1先端エ
ッヂの位置精度や加工精度を上げる必要がなくなるため
加工費も安くできる。Next, FIG. 2 shows an example of the vicinity of the transfer portion of the image forming apparatus of the present invention, which will be described. Connecting member 5
c at the downstream end in the moving direction of the transfer drum 5
A cushioning flexible sheet 5d made of Mylar (trade name) is affixed to the inner surface thereof. Since the leading end of the flexible sheet 5 d is attached so as to contact the sheet 15, the backup member 61 passes through the connecting member 5 c by the movement of the transfer drum 5, and
Since the step at the time of collision with the sheet is slightly equal to the thickness of the flexible sheet 5d (about 0.1 mm), the image blur described above does not occur at all. Further, in order to prevent the impact on the carrying sheet 15 of the flexible sheet 5d by providing a flexible sheet 5d, it is not necessary to raise the positional accuracy and processing accuracy of the tapered portion 5c 1 tip edge of the connecting member 5c Therefore, processing costs can be reduced.
【0020】図3に本発明の画像形成装置の転写部近傍
の他の例を示す。FIG. 3 shows another example of the vicinity of the transfer portion of the image forming apparatus of the present invention.
【0021】連結部材5cの下流側端部にはテーパ部5
c1が設けられており、その内面に緩衝用可撓性シート
5′dが配置されているのは図2の実施例と同様である
が、テーパ部に可撓性シートを貼り付けずに、連結部材
5cの内側のフラット面5eに貼り付けている。また、
可撓性シート5′dテーパ部の内側角部5c2と角度が
一致するように曲げを付けられており、その角度は可撓
性シート5′dが外力を与えられない状態でθの角度に
初期設定されている。これを前述したフラット面5eに
可撓性シート5′dを貼り付けると担持シート15がな
い場合には図3に示す2点鎖線の状態になる。この時、
連結部材5cのテーパ部5c1の角度と比較するとθ1<
θと設定しておく。このように作成することで可撓性シ
ート5′dはその自由長部5′d1がテーパ部5c1面に
可撓性シート5′dの弾性変形分の力で圧接保持され
る。またこの時、その自由長部5′d1が転写ドラム5
外径に対しl[mm]だけ突出する(担持シート15がない
場合)ような長さにしておくと、担持シート15を転写
ドラム5で張架した後、さらに可撓性シート5′dの角
度は担持シート15に可撓性シート5′dが押圧される
ことで小さく(θ2)なる。A tapered portion 5 is provided at the downstream end of the connecting member 5c.
c 1 is provided, and the buffering flexible sheet 5 ′ d is disposed on the inner surface thereof as in the embodiment of FIG. 2, but without attaching the flexible sheet to the tapered portion. Is attached to the flat surface 5e inside the connecting member 5c. Also,
Flexible inner corner portion 5c 2 and the angle of the seat 5'd tapered portion is attached to bent to match the angle of the angle θ in a state where the flexible sheet 5'd is not given an external force Initially set to When the flexible sheet 5'd is attached to the flat surface 5e described above, the state shown by the two-dot chain line shown in FIG. At this time,
Compared to the angle of the tapered portion 5c 1 of the connecting member 5c theta 1 <
θ is set in advance. The flexible sheet 5'd by creating as its free length part 5'd 1 is pressed against the holding of an elastic deformation amount of the force of the flexible sheet 5'd on one side tapered portion 5c. Further, at this time, its free length part 5'd 1 transfer drum 5
If the length is set so as to protrude by l [mm] from the outer diameter (when there is no supporting sheet 15), the supporting sheet 15 is stretched by the transfer drum 5, and then the flexible sheet 5'd The angle becomes smaller (θ 2 ) when the flexible sheet 5′d is pressed against the supporting sheet 15.
【0022】このような構成にすると図2の実施例より
もさらに確実に(すなわち組立精度、部品精度が良くな
くても)可撓性シート5′dが連結部材5cを通過する
ときの段差は可撓性シート5′dの厚み分となる。その
際、前記lの長さを充分長くとると、可撓性シート5′
dによって形成される傾斜面はなだらかとなり、可撓性
シート5′dはさらに確実に担持シート15と接触する
ため、連結部材5cの転写ドラム5外周径に対する位置
精度も上げる必要がなくなり、加工コストも安くでき
る。With such a configuration, the step when the flexible sheet 5'd passes through the connecting member 5c is more reliably than the embodiment of FIG. 2 (ie, even if the assembly precision and the component precision are not good). This is equivalent to the thickness of the flexible sheet 5'd. At this time, if the length l is sufficiently long, the flexible sheet 5 '
d makes the inclined surface gentle and the flexible sheet 5'd more reliably comes into contact with the supporting sheet 15, so that it is not necessary to increase the positional accuracy of the connecting member 5c with respect to the outer diameter of the transfer drum 5, and the processing cost is reduced. Can also be cheaper.
【0023】図4には本発明の画像形成装置の転写部近
傍の更なる例を示す。緩衝用可撓性シート5′′dは図
3の実施例と同様、連結部5cのフラット面5eに貼り
付けられているが、曲げ部が設けられていない(二点鎖
線が初期状態)。このような構成にしても図3の実施例
と同様の効果が得られる。但し、この時の緩衝用可撓性
シート5′′dはバックアップ部材61によって容易に
変形できる程度の材質又は厚みを選定する必要がある。FIG. 4 shows a further example near the transfer section of the image forming apparatus of the present invention. The cushioning flexible sheet 5''d is attached to the flat surface 5e of the connecting portion 5c as in the embodiment of FIG. 3, but has no bent portion (the two-dot chain line is the initial state). Even with such a configuration, the same effect as the embodiment of FIG. 3 can be obtained. However, at this time, it is necessary to select the material or thickness of the buffering flexible sheet 5 ″ d that is easily deformed by the backup member 61.
【0024】図3の実施例ではテーパ部を有する連結部
材を用いているが、図4の本実施例によれば平板状の板
金を用いることができるので加工費もさらに節減でき
る。In the embodiment shown in FIG. 3, a connecting member having a tapered portion is used. However, according to the embodiment shown in FIG. 4, a plate-like sheet metal can be used, so that the processing cost can be further reduced.
【0025】また、図5に示すように可撓性シート5
d′′′は短い幅で短柵状に配置しても良い。このよう
な構成でも図2〜図4のように連結部材5cの長手方向
に延ばして設けた場合と同様の効果が期待できる。Also, as shown in FIG.
d '''' may be arranged in a short fence with a short width. Even with such a configuration, the same effect as when the connecting member 5c is provided extending in the longitudinal direction as shown in FIGS. 2 to 4 can be expected.
【0026】また本実施例では連結部材5cの長手方向
に4ケ所分割配置しているが、可撓性シート5d′′′
が中央1ヶ所であっても、両端2ケ所であっても良い。In this embodiment, the connecting member 5c is divided into four portions in the longitudinal direction, but the flexible sheet 5d "" is provided.
May be located at the center or two places at both ends.
【0027】また以上の実施例で示した可撓性シートの
厚さは、本発明者らの実験によると50μm〜250μ
m程度が良かった。According to experiments performed by the inventors of the present invention, the thickness of the flexible sheet shown in the above embodiments is 50 μm to 250 μm.
m was good.
【0028】次に、本発明の比較例として上述したよう
な可撓性シートを設けない例を示す。Next, as a comparative example of the present invention, an example in which the above-mentioned flexible sheet is not provided will be described.
【0029】図11はその転写部近傍の断面図を示すよ
うに連結部材下流側端面の断面形状をテーパ状にして転
写ドラムの移動に対して徐々にバックアップ部材61が
連結部材を抜けるように構成するものである。図11に
示すようにテーパ形状のエッジ部先端は、切削加工にせ
よ、成形加工にせよ、角部半径Rを0にすることは困難
であり、また連結部材にバリ、キズ等があると内部の転
写帯電ワイヤから高圧リーク電流を発生する。従って、
実用上の限界としてテーパ形状のエッジ部先端の角部を
R=0.5mm程度にすると図11に示すような段差が
生じる。また、連結部材のエッジ部は担持シートに対し
充分近づけねば段差がさらに発生するが、連結部材の長
手方向ソリや部品寸法のバラツキ等を考えると(最悪で
も転写ドラム外径以上に出張らないよう設計する)0.
5mm程度の逃がしが必要である。すなわち、連結部材
を担持シートとの1mm程度の段差(図11のd)から
バックアップ部材がジャンプして担持シートへ衝突する
衝撃は取りきれず画像ブレに対し不十分であった。FIG. 11 is a cross-sectional view showing the vicinity of the transfer portion. The cross-sectional shape of the end face on the downstream side of the connecting member is tapered so that the backup member 61 gradually passes through the connecting member as the transfer drum moves. Is what you do. As shown in FIG. 11, it is difficult to reduce the radius R of the corner portion to 0 at the tip of the tapered edge, whether it is cut or formed, and if the connecting member has burrs, scratches, etc. A high-pressure leak current is generated from the transfer charging wire. Therefore,
As a practical limit, when the corner at the tip of the tapered edge portion is set to about R = 0.5 mm, a step as shown in FIG. 11 occurs. Further, if the edge portion of the connecting member is not sufficiently close to the supporting sheet, a step is further generated. Design) 0.
A relief of about 5 mm is required. That is, the impact of the backup member jumping from the step of about 1 mm between the connecting member and the carrying sheet (FIG. 11D) and colliding with the carrying sheet could not be completely removed, and the image blur was insufficient.
【0030】また図12にも図11と同様に転写部近傍
の断面図を示しているが、図12の例では転写ドラムの
移動によりバックアップ部材が連結部材を通過して衝突
する担持シート15裏側にゴムからなる弾性部材を配置
している。FIG. 12 also shows a cross-sectional view of the vicinity of the transfer section similarly to FIG. 11, but in the example of FIG. 12, the back side of the carrier sheet 15 where the backup member passes through the connecting member and collides with the movement of the transfer drum. , An elastic member made of rubber is arranged.
【0031】ところが図12の例においてもゴムの厚み
部の段差dはどうしても残り、逆にそれを薄くするほど
衝撃の緩和効果がなくなるという不都合を生じてしまっ
た。従って、やはり1mm程度の段差(図12のd)は
必要であり、バックアップ部材がゴムを通過するときの
衝撃による画像ブレが生じてしまった。However, even in the example shown in FIG. 12, the step d in the rubber thickness portion remains inevitably, and conversely, as the thickness is reduced, the effect of reducing the impact is lost. Therefore, a step (d in FIG. 12) of about 1 mm is still necessary, and image blurring due to impact when the backup member passes through the rubber has occurred.
【0032】[0032]
【発明の効果】以上説明したように、本発明によれば、
押圧部材が連結部材を通過するときに発生する衝撃や振
動を防止することができるので、転写材担持手段の移動
ムラや画像ブレを防止することができる。As described above, according to the present invention,
Since it is possible to prevent shock and vibration generated when the pressing member passes through the connecting member, it is possible to prevent uneven movement and image blur of the transfer material carrying unit.
【図1】本発明の画像形成装置の一実施例を示す概略断
面図である。FIG. 1 is a schematic sectional view showing one embodiment of an image forming apparatus of the present invention.
【図2】本発明の画像形成装置の転写部近傍の一例を示
す拡大断面図である。FIG. 2 is an enlarged cross-sectional view illustrating an example of the vicinity of a transfer unit of the image forming apparatus of the present invention.
【図3】本発明の画像形成装置の転写部近傍の一例を示
す拡大断面図である。FIG. 3 is an enlarged cross-sectional view illustrating an example of the vicinity of a transfer unit of the image forming apparatus of the present invention.
【図4】本発明の画像形成装置の転写部近傍の一例を示
す拡大断面図である。FIG. 4 is an enlarged cross-sectional view illustrating an example of the vicinity of a transfer unit of the image forming apparatus of the present invention.
【図5】本発明の画像形成装置の転写材担持手段の連結
部近傍の斜視図である。FIG. 5 is a perspective view of the vicinity of a connecting portion of a transfer material carrying unit of the image forming apparatus of the present invention.
【図6】従来の画像形成装置の断面図である。FIG. 6 is a sectional view of a conventional image forming apparatus.
【図7】転写ドラムの斜視図である。FIG. 7 is a perspective view of a transfer drum.
【図8】従来の転写部近傍の断面図である。FIG. 8 is a cross-sectional view near a conventional transfer unit.
【図9】従来の転写部近傍の断面図である。FIG. 9 is a cross-sectional view near a conventional transfer unit.
【図10】従来の転写部近傍の断面図である。FIG. 10 is a cross-sectional view near a conventional transfer portion.
【図11】画像形成装置の転写部近傍の比較例を示す拡
大断面図である。FIG. 11 is an enlarged cross-sectional view illustrating a comparative example near a transfer portion of the image forming apparatus.
【図12】画像形成装置の転写部近傍の比較例を示す拡
大断面図である。FIG. 12 is an enlarged cross-sectional view illustrating a comparative example near a transfer portion of the image forming apparatus.
1 感光ドラム 5 転写ドラム 5c 連結部材 5d,5d′,5d′′,5d′′′ 可撓性シート 15 担持シート 24 転写帯電器 61 バックアップ部材 Reference Signs List 1 photosensitive drum 5 transfer drum 5c connecting member 5d, 5d ', 5d ", 5d" "flexible sheet 15 support sheet 24 transfer charger 61 backup member
Claims (4)
手段であって、一対の環状部材と、前記一対の環状部材
を連結する連結部材と、前記一対の環状部材及び前記連
結部材により形成される開口部を覆い転写材を担持する
転写材担持シートと、を備える転写材担持手段と、前記
転写材担持シートの内側に設けられ前記転写材担持シー
トを外側に向けて押圧する押圧部材と、を有し、像担持
体上の像を前記転写材担持シートに担持された転写材に
転写する画像形成装置において、 前記転写材担持手段の移動方向において前記連結部材の
後端部に設けられ前記転写材担持シートに接触可能な可
撓性シートを有し、前記押圧部材は、前記転写材担持手
段の移動により、前記連結部材から前記可撓性シートが
前記転写材担持シートに接触する位置を経て前記転写材
担持シートに当接されることを特徴とする画像形成装
置。1. A movable transfer material holding means for holding a transfer material, comprising: a pair of annular members; a connecting member connecting the pair of annular members; and a pair of annular members and the connecting member. A transfer material supporting means for covering the opening to be formed and supporting the transfer material, and a pressing member provided inside the transfer material supporting sheet and pressing the transfer material supporting sheet outward. An image forming apparatus for transferring an image on an image carrier to a transfer material carried on the transfer material carrying sheet, provided at a rear end of the connecting member in a moving direction of the transfer material carrying means. A flexible sheet capable of contacting the transfer material carrying sheet, wherein the pressing member is located at a position where the flexible sheet comes into contact with the transfer material carrying sheet from the connecting member by movement of the transfer material carrying means; To An image forming apparatus characterized in that it is contact with the transfer material carrying sheet Te.
材担持シートと接触しないように、前記可撓性シートは
前記転写材担持シートを外側に押圧することを特徴とす
る請求項1の画像形成装置。2. The flexible sheet presses the transfer material-carrying sheet outward so that the outside of the rear end of the connecting member does not contact the transfer material-carrying sheet. Image forming apparatus.
μmであることを特徴とする請求項1又は2の画像形成
装置。3. The flexible sheet has a thickness of 50 to 250.
The image forming apparatus according to claim 1, wherein the thickness of the image forming apparatus is μm.
ることを特徴とする請求項1乃至3のいずれかの画像形
成装置。4. An image forming apparatus according to claim 1, wherein a rear end of said connecting member has a tapered shape.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP03034746A JP3072780B2 (en) | 1991-02-28 | 1991-02-28 | Image forming device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP03034746A JP3072780B2 (en) | 1991-02-28 | 1991-02-28 | Image forming device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04273272A JPH04273272A (en) | 1992-09-29 |
JP3072780B2 true JP3072780B2 (en) | 2000-08-07 |
Family
ID=12422891
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP03034746A Expired - Fee Related JP3072780B2 (en) | 1991-02-28 | 1991-02-28 | Image forming device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3072780B2 (en) |
-
1991
- 1991-02-28 JP JP03034746A patent/JP3072780B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH04273272A (en) | 1992-09-29 |
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