JPS6252300B2 - - Google Patents
Info
- Publication number
- JPS6252300B2 JPS6252300B2 JP54129171A JP12917179A JPS6252300B2 JP S6252300 B2 JPS6252300 B2 JP S6252300B2 JP 54129171 A JP54129171 A JP 54129171A JP 12917179 A JP12917179 A JP 12917179A JP S6252300 B2 JPS6252300 B2 JP S6252300B2
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- rollers
- guide plate
- guide member
- pair
- 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
- 230000002093 peripheral effect Effects 0.000 description 9
- 210000000078 claw Anatomy 0.000 description 6
- 230000037303 wrinkles Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Fixing For Electrophotography (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
Description
【発明の詳細な説明】
本発明は複写機・印刷機等において、一面に未
定着なトナー画像を有するシートを搬送手段によ
つて上下一対の圧接回転するローラ間に挿入し、
両ローラ間を通過させることによつてトナー画像
を定着するようにした定着装置の改良に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention uses a copying machine, a printing machine, etc., in which a sheet having an unfixed toner image on one side is inserted between a pair of upper and lower rotating rollers by means of a conveying means, and
The present invention relates to an improvement of a fixing device that fixes a toner image by passing it between both rollers.
上記搬送手段としては、その搬送路を一直線ま
たは山形とし、例えば搬送部材として無端ベル
ト・吸引フアンおよび分離爪を併用したものが公
知である。この搬送手段のシート搬送は搬送路の
片側、例えば複写機の場合感光ドラム側におい
て、分離爪によつて感光ドラム外周面から転写後
のシートを分離し、そのシートを無端ベルト上に
導いて吸引フアンの吸引力によつて無端ベルト上
面に吸着させ、定着用ローラ対まで搬送するもの
である。この搬送手段においては、シートが無端
ベルト上面に吸着されたときに、適正な展張状態
にないと定着用ローラ対間に挿入され、通過する
際にしわを発生するという不具合がある。 As the above-mentioned conveyance means, one is known in which the conveyance path is straight or mountain-shaped, and for example, an endless belt, a suction fan, and a separating claw are used together as the conveyance member. The sheet is conveyed by this conveyance means on one side of the conveyance path, for example, on the photosensitive drum side in the case of a copying machine, the sheet after transfer is separated from the outer peripheral surface of the photosensitive drum by a separating claw, and the sheet is guided onto an endless belt and sucked. The suction force of the fan causes the toner to be attracted to the upper surface of the endless belt, and the toner is conveyed to a pair of fixing rollers. This conveying means has a problem in that when the sheet is attracted to the upper surface of the endless belt, if it is not properly stretched, it will be inserted between the pair of fixing rollers and wrinkles will occur when the sheet passes through.
そこで、搬送手段と定着用ローラ対間に複写シ
ートの展張状態を矯正するガイド板を配設するこ
とが行われている。このガイド板はその一端縁お
よびその近傍を弧面に形成し、その一端縁を上部
ローラに向けて両ローラ圧接面よりも上方に位置
させたもので、ガイド板の弧面により、その頂部
から両裾部に向けてシートを展張させると共にガ
イド板の一端縁から突出した弧状をなすシート先
端縁を、上部ローラとガイド先端縁間に形成され
ているスリツトを通してローラ対圧接面に進入さ
せ、その際の紙の曲がりによつて紙の裏面をガイ
ド板先端でしごくように展張させて定着用ローラ
対間に挿入する作用を有する。 Therefore, a guide plate is disposed between the conveyance means and the pair of fixing rollers to correct the stretched state of the copy sheet. This guide plate has one end edge and its vicinity formed into an arcuate surface, and the one end edge faces the upper roller and is positioned above the pressure contact surfaces of both rollers. The sheet is stretched toward both hems, and the leading edge of the arched sheet protruding from one end edge of the guide plate is passed through a slit formed between the upper roller and the leading edge of the guide, and enters the pressure contact surface of the roller. The bending of the paper causes the back surface of the paper to be stretched out at the tip of the guide plate and inserted between the pair of fixing rollers.
しかしながら上記ガイド板を用いた場合には、
シート上面の未定着トナー画像面が、定着用ロー
ラ対間に挿入される前に上部ローラ外周面と接触
するため、画像を乱すという不具合がある。 However, when using the above guide plate,
Since the unfixed toner image surface on the upper surface of the sheet comes into contact with the outer peripheral surface of the upper roller before being inserted between the pair of fixing rollers, there is a problem that the image is disturbed.
本発明は上記従来の不具合に鑑みて提案された
もので、画像を乱すおそれのないガイド手段を備
えた定着装置を提供することを目的とする。 The present invention was proposed in view of the above-mentioned conventional problems, and an object of the present invention is to provide a fixing device equipped with a guide means that does not cause image disturbance.
以下図面により本発明を複写機に適用した一実
施例について説明する。 An embodiment in which the present invention is applied to a copying machine will be described below with reference to the drawings.
１は外周面に感光層２を有する感光ドラムで、
矢示方向に回転駆動され、その周面に、図に省略
した静電潜像形成手段・現像手段でトナー像２６
が形成される。感光ドラム１の周方に転写用帯電
器３および分離爪４が配設されている。一側部を
分離爪４に接近させて複写シート搬送用の無端ベ
ルト５が一対のローラ６，７間に張設され矢示方
向に回動する。無端ベルト５のループ内には吸引
フアン８が設けられている。無端ベルト５の他側
部と一定間隔をとつて上下一対の定着用ローラ
９，１０が配置されている。上部ローラ９は金属
製円筒１１を心として、その外周面に４弗化エチ
レン樹脂等のシートに対し剥離性の良い表皮層１
２を有し、且内部にはトナーを加熱定着する熱源
としてヒータ１３を有する。表皮層１２の外周面
には適宜オフセツト防止液が塗布される。下部ロ
ーラ１０は金属製円筒１４を心として、その外周
面に比較的厚いシリコーンゴム等のシートに対し
剥離性の良い表皮層１５を有し、且内部にヒータ
１６を有する。両ローラ９，１０は一定接触圧の
下に圧接され、矢示方向に回転する。 1 is a photosensitive drum having a photosensitive layer 2 on its outer peripheral surface;
The toner image 26 is driven to rotate in the direction of the arrow, and an electrostatic latent image forming means/developing means (not shown in the figure) forms a toner image 26 on its peripheral surface.
is formed. A transfer charger 3 and a separation claw 4 are arranged around the circumference of the photosensitive drum 1. An endless belt 5 for conveying a copy sheet is stretched between a pair of rollers 6 and 7 with one side close to the separating claw 4 and rotates in the direction of the arrow. A suction fan 8 is provided within the loop of the endless belt 5. A pair of upper and lower fixing rollers 9 and 10 are arranged at a constant distance from the other side of the endless belt 5. The upper roller 9 has a metal cylinder 11 as its center, and a skin layer 1 having good releasability against sheets of tetrafluoroethylene resin etc. is provided on the outer peripheral surface of the upper roller 9.
2, and a heater 13 inside as a heat source for heating and fixing the toner. An anti-offset liquid is appropriately applied to the outer peripheral surface of the skin layer 12. The lower roller 10 has a metal cylinder 14 as its center, has a skin layer 15 on its outer peripheral surface that has good peelability against a relatively thick sheet of silicone rubber, and has a heater 16 inside. Both rollers 9 and 10 are pressed together under constant contact pressure and rotate in the direction of the arrow.
無端ベルト５と定着用ローラ対９，１０との間
にガイド板１７が配設されている。そのガイド板
１７はその一端縁１８およびその近傍を第２図に
示すようにシート搬送方向に関して直角の方向に
弧面１９に形成されており、その一端縁１８を定
着用ローラ対９，１０に向け、他端縁２０の下面
を軸２１により揺動可能に支持されている。ガイ
ド板１７の上面一側に引張りコイルばね２２の一
端が連結され、そのばね２２の他端は固定軸２３
に連結されて板１７に軸２１を中心とした反時計
方向の回動力を付勢している。またガイド板１７
の上面一側にストツパ２４が当接し、ガイド板１
７の一端縁１８を非定着時において定着用ローラ
対９，１０の圧接面２５よりも上方に保持してい
て、ローラ９とガイド板先端縁１８との間にスリ
ツトが形成されている。 A guide plate 17 is disposed between the endless belt 5 and the pair of fixing rollers 9 and 10. The guide plate 17 has one end edge 18 and its vicinity formed into an arcuate surface 19 in a direction perpendicular to the sheet conveyance direction, as shown in FIG. The lower surface of the other end edge 20 is swingably supported by a shaft 21. One end of a tension coil spring 22 is connected to one side of the upper surface of the guide plate 17, and the other end of the spring 22 is connected to a fixed shaft 23.
The plate 17 is connected to the plate 17 to apply a rotation force in a counterclockwise direction about the shaft 21. Also, the guide plate 17
A stopper 24 is in contact with one side of the upper surface of the guide plate 1.
One end edge 18 of the guide plate 7 is held above the pressing surface 25 of the pair of fixing rollers 9 and 10 when not fixing, and a slit is formed between the roller 9 and the leading edge 18 of the guide plate.
前記無端ベルト５のシート送り速度V1と定着
用ローラ対９，１０のそれV2とはV2＞V1の関係
に設定されている。 The sheet feeding speed V 1 of the endless belt 5 and the speed V 2 of the pair of fixing rollers 9 and 10 are set to have a relationship of V 2 >V 1 .
上記の構成において、シートＳは図に省略した
収納部から感光ドラム１の外周面に向けて搬送さ
れ、その上面に転写用帯電器３によつてドラム外
周面に形成されているトナー画像２６を転写され
る。転写後シートＳはその先端縁から後端縁に向
けて分離爪４によつてドラム外周面から剥離さ
れ、次いで無端ベルト５上に導かれ、吸引フアン
８の吸引力によつて無端ベルト５上面に吸着され
て搬送される。シートＳの先端縁がガイド板１７
の上面を通過すると、前記のようにその弧面１９
およびその先端１８によるしごきによつてしわを
矯正される。その後シートＳの先端縁がローラ対
９，１０間に挿入され圧接面２５に達すると、前
記ローラ対９，１０と上面にシートＳを吸着させ
た無端ベルト５の搬送速度V2＞V1の関係によつ
てシートＳが引張られ、ガイド板１７がばね２２
の引張り力に抗して下方へ揺動し、一端縁１８が
圧接面２５と略同等の高さに位置する。これによ
りシートＳ上面の未定着トナー画像２６が圧接面
２５に到達する前に上部ローラ９に接触すること
が阻止され、画像の乱れを生じることがない。 In the above configuration, the sheet S is conveyed from a storage section (not shown) toward the outer circumferential surface of the photosensitive drum 1, and the toner image 26 formed on the outer circumferential surface of the drum by the transfer charger 3 is placed on the upper surface of the sheet S. transcribed. The transferred sheet S is separated from the outer peripheral surface of the drum by the separating claw 4 from the leading edge to the trailing edge, and then guided onto the endless belt 5 , where it is separated from the upper surface of the endless belt 5 by the suction force of the suction fan 8 . It is adsorbed and transported. The leading edge of the sheet S is the guide plate 17
When passing through the upper surface of the arc surface 19 as mentioned above,
The wrinkles are corrected by squeezing with the tip 18. Thereafter, when the leading edge of the sheet S is inserted between the pair of rollers 9 and 10 and reaches the pressure contact surface 25, the conveying speed of the endless belt 5 that has attracted the sheet S to the pair of rollers 9 and 10 and the upper surface thereof is V 2 >V 1 . The sheet S is pulled by the relationship, and the guide plate 17 is pulled by the spring 22.
, and one end edge 18 is located at approximately the same height as the pressure contact surface 25 . This prevents the unfixed toner image 26 on the upper surface of the sheet S from coming into contact with the upper roller 9 before reaching the pressure contact surface 25, thereby preventing image disturbance.
シートＳの後端縁が無端ベルト５上面から外れ
ると、ガイド板１７はばね２２の引張り力によつ
て上方へ揺動し、その上面一側をストツパ２４に
当接させて当初の位置に復帰する。 When the rear edge of the sheet S comes off the top surface of the endless belt 5, the guide plate 17 swings upward due to the tensile force of the spring 22, brings one side of its top surface into contact with the stopper 24, and returns to its original position. do.
なおガイド板１７の上下方向への揺動は、ロー
ラ対圧接面２５の入口近傍に光電変換素子等の検
出手段２７，２８を設け、シートＳの先端縁およ
び後端縁のローラ対圧面２５の通過を検知するこ
とによつて行うようにしてもよい。即ち、板１７
の先端をばね２２の力に抗してローラ対圧接面２
５と同じ高さにまで引き下げるプランジヤーを設
け、シート先端がローラ対に銜え込まれたら同プ
ランジヤーを作動させ、シート後端がガイド板先
端１８を通過してローラ対間に入る前、又は少な
くともローラ対を通過した時点で同プランジヤー
を非作動に戻す。またストツパ２４をカム板とし
て装置組立時等におけるガイド板１７の一端縁１
８の位置調整を行うようにしてもよい。 The vertical swing of the guide plate 17 is controlled by providing detection means 27 and 28 such as photoelectric conversion elements near the inlet of the roller pressure contact surface 25, and detecting the movement of the roller contact surface 25 at the leading and trailing edges of the sheet S. This may be done by detecting passage. That is, plate 17
The tip of the roller is pressed against the pressure contact surface 2 against the force of the spring 22.
A plunger is provided to lower the sheet to the same height as 5, and when the leading edge of the sheet is gripped by the pair of rollers, the plunger is activated, and the trailing edge of the sheet passes through the leading edge of the guide plate 18 and enters between the pair of rollers, or at least When the plunger passes through the pair, the plunger is returned to deactivation. Also, one end edge 1 of the guide plate 17 can be used as the stopper 24 as a cam plate when assembling the device.
8 may be adjusted.
以上のように本発明によれば、シート先端縁が
両ローラ間に挿入されるまではガイド板の一端縁
を両ローラの圧接面よりも上方に保持するので、
上部ローラ外周面のシート先端縁に対するしごき
によりしわを矯正することができる。またシート
先端縁が両ローラ間に挿入された後は、ガイド板
の一端縁を両ローラの圧接面と略同等の高さに保
持するので、シート上面の未定着画像が上部ロー
ラと接触することがなく、画像を乱すおそれはな
いものである。 As described above, according to the present invention, one end edge of the guide plate is held above the pressure contact surfaces of both rollers until the leading edge of the sheet is inserted between both rollers.
Wrinkles can be corrected by squeezing the leading edge of the sheet on the outer peripheral surface of the upper roller. Furthermore, after the leading edge of the sheet is inserted between both rollers, one end edge of the guide plate is held at approximately the same height as the pressure contact surface of both rollers, so that the unfixed image on the top surface of the sheet does not come into contact with the upper roller. There is no risk of disturbing the image.
第１図は本発明の一実施例の正面図、第２図は
定着用ローラ対とガイド板との関係を示す側面図
である。
４，５，８は搬送手段としての分離爪・無端ベ
ルトおよび吸引フアン、９は上部ローラ、１０は
下部ローラ、２５は圧接面、２６は未定着トナー
画像、１７はガイド板、Ｓはシート、１８はガイ
ド板一端縁。
FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a side view showing the relationship between a pair of fixing rollers and a guide plate. 4, 5, and 8 are separation claws, an endless belt, and a suction fan as conveyance means, 9 is an upper roller, 10 is a lower roller, 25 is a pressure contact surface, 26 is an unfixed toner image, 17 is a guide plate, S is a sheet, 18 is one edge of the guide plate.
Claims (1)
搬送手段によつて上下一対の圧接回転するローラ
間に挿入し、両ローラ間を通過させることによつ
て前記トナー画像を定着するようにした定着装置
において、前記搬送手段と前記両ローラとの間
に、支持軸によつて枢着されたガイド部材を設
け、前記ガイド部材を付勢手段によつて付勢し
て、前記シートの先端縁が両ローラ間に挿入され
るまでは前記ガイド部材のローラ側端部が両ロー
ラの圧接面よりも上方位置に位置するようにし、
一方、前記シートの先端縁が両ローラ間に挿入さ
れた後は前記ガイド部材のローラ側端部が前記上
方位置よりも下方に位置するように、前記ガイド
部材を支持軸を中心に回動可能としたことを特徴
とする定着装置。1. A fixing device in which a sheet having an unfixed toner image on its upper surface is inserted between a pair of upper and lower rollers that rotate under pressure using a conveyance means, and the toner image is fixed by passing between both rollers. A guide member pivotally connected by a support shaft is provided between the conveying means and both rollers, and the guide member is biased by a biasing means so that the leading edge of the sheet is Until the guide member is inserted between the rollers, the roller side end portion of the guide member is positioned above the pressure contact surfaces of both rollers,
On the other hand, after the leading edge of the sheet is inserted between both rollers, the guide member can be rotated about the support shaft so that the roller side end of the guide member is located below the upper position. A fixing device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12917179A JPS5652782A (en) | 1979-10-05 | 1979-10-05 | Fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12917179A JPS5652782A (en) | 1979-10-05 | 1979-10-05 | Fixing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5652782A JPS5652782A (en) | 1981-05-12 |
| JPS6252300B2 true JPS6252300B2 (en) | 1987-11-04 |
Family
ID=15002889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12917179A Granted JPS5652782A (en) | 1979-10-05 | 1979-10-05 | Fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5652782A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0128518Y2 (en) * | 1981-06-08 | 1989-08-30 | ||
| JPS5886657U (en) * | 1981-12-07 | 1983-06-11 | 株式会社リコー | Conveyance device to copier fixing roller |
| JPS59151175A (en) * | 1983-02-15 | 1984-08-29 | Toshiba Corp | Fixing device |
| JPS59158155U (en) * | 1983-04-11 | 1984-10-23 | 京セラミタ株式会社 | Fusing device in copying machine |
| JPS59212865A (en) * | 1983-05-18 | 1984-12-01 | Konishiroku Photo Ind Co Ltd | Recording paper guiding device of fixing device |
| US4693587A (en) * | 1984-07-16 | 1987-09-15 | Canon Kabushiki Kaisha | Image forming apparatus |
| JPS6290338U (en) * | 1985-11-26 | 1987-06-09 | ||
| JPH01114882A (en) * | 1987-10-29 | 1989-05-08 | Hitachi Ltd | Heating and fixing device |
| US4859831A (en) * | 1988-06-15 | 1989-08-22 | Xerox Corporation | Fuser system |
| WO2020226179A1 (en) * | 2019-05-08 | 2020-11-12 | 積水化学工業株式会社 | Film processing device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5050044A (en) * | 1973-09-01 | 1975-05-06 | ||
| JPS5335731A (en) * | 1976-09-16 | 1978-04-03 | Asahi Glass Co Ltd | Production of hollow* lighttweight concrete board and of combined hollow lighttweight concrete board |
-
1979
- 1979-10-05 JP JP12917179A patent/JPS5652782A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5050044A (en) * | 1973-09-01 | 1975-05-06 | ||
| JPS5335731A (en) * | 1976-09-16 | 1978-04-03 | Asahi Glass Co Ltd | Production of hollow* lighttweight concrete board and of combined hollow lighttweight concrete board |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5652782A (en) | 1981-05-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5187527A (en) | Device for eliminating the curl of sheets emerging from a fixing station | |
| JPS6252300B2 (en) | ||
| JPH0215462B2 (en) | ||
| JPS6327372A (en) | Image former | |
| JPH0328438Y2 (en) | ||
| JPH06202519A (en) | Image forming device | |
| JP3935744B2 (en) | Fixing apparatus and image forming apparatus | |
| JPS59108641A (en) | Sheet curl straightening device | |
| JPS5822230A (en) | Sheet transfer device | |
| JPS61197344A (en) | Paper-sheet regulator | |
| JP3742181B2 (en) | Fixing device | |
| JPH0224130Y2 (en) | ||
| JP3920529B2 (en) | Fixing apparatus and image forming apparatus having the same | |
| JP7497601B2 (en) | Fixing device and image forming apparatus | |
| JPH0643075Y2 (en) | Belt transport device for electronic copier | |
| JPH0546041Y2 (en) | ||
| JPH09288434A (en) | Image forming device | |
| JPH0428106Y2 (en) | ||
| JPH02226178A (en) | Paper guide device of heat roller fixing device | |
| JPS6312358Y2 (en) | ||
| JPS6137005Y2 (en) | ||
| JPH0573666B2 (en) | ||
| JP2001022205A (en) | Fixing device | |
| JPS63271382A (en) | Fixing device | |
| JPH0554455U (en) | Image forming device |