JPH0743731Y2 - Fixing device for electrophotographic device - Google Patents
Fixing device for electrophotographic deviceInfo
- Publication number
- JPH0743731Y2 JPH0743731Y2 JP1988024383U JP2438388U JPH0743731Y2 JP H0743731 Y2 JPH0743731 Y2 JP H0743731Y2 JP 1988024383 U JP1988024383 U JP 1988024383U JP 2438388 U JP2438388 U JP 2438388U JP H0743731 Y2 JPH0743731 Y2 JP H0743731Y2
- Authority
- JP
- Japan
- Prior art keywords
- heat roller
- outer peripheral
- roller
- paper
- peripheral surface
- 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 - Lifetime
Links
Landscapes
- Fixing For Electrophotography (AREA)
Description
【考案の詳細な説明】 産業上の利用分野 この考案は、電子写真装置の定着装置に関する。TECHNICAL FIELD The present invention relates to a fixing device for an electrophotographic apparatus.
従来の技術 従来、第３図に示すように、中央部から両端部に向かう
に従い外径が次第に太くなるヒートローラ20と、逆に、
中央部から両端部に向かうに従い次第に外径が細くなる
プレスローラ21とにより用紙23を挾持するようにした定
着装置が存する。そして、この定着装置による定着工程
の前工程では感光体（図示せず）に形成されたトナー像
が用紙23に定着され、この用紙23上の転写画像を定着装
置により定着している。2. Description of the Related Art Conventionally, as shown in FIG. 3, the heat roller 20 has an outer diameter that gradually increases from the center to both ends, and conversely,
There is a fixing device in which a paper sheet 23 is held by a press roller 21 whose outer diameter becomes gradually smaller from the central portion toward both end portions. Then, in the preceding step of the fixing process by the fixing device, the toner image formed on the photoconductor (not shown) is fixed on the paper 23, and the transfer image on the paper 23 is fixed by the fixing device.
考案が解決しようとする問題点 上記のヒートローラ20はモータに連結されて周速度が中
央部より外周部の方が速いため、用紙23は中央部の送り
長さより両側部の送り長さの方が長くなる状態で送ら
れ、これにより、用紙23には中央部から両側部に向けて
引張力が作用し、これにより、用紙23を伸ばすことを期
待している。Problems to be Solved by the Invention Since the heat roller 20 is connected to the motor and the peripheral speed is faster in the outer peripheral portion than in the central portion, the paper 23 has a feed length on both sides rather than the central portion. The sheet 23 is fed in a lengthened state, and as a result, a tensile force acts on the sheet 23 from the central portion toward both sides, and it is expected that the sheet 23 will be stretched.
一方、ヒートローラ20はヒータを内蔵しているため耐熱
性の材料により形成する必要があり、また、トナーの付
着を防止するために摩擦係数の高い材料で形成されるこ
とはない。このため、一般には、プレスローラ21の摩擦
係数をヒートローラ20のそれより高めて用紙23の搬送力
を高めている。したがつて、用紙23の搬送力はプレスロ
ーラ21に左右されるが、プレスローラ21の周速度は中央
部が速く両端部に向かうに従い遅くなるため、用紙23に
は外側から中央部に向かう引張力が作用する。これによ
り、用紙23にしわがよる問題がある。On the other hand, since the heat roller 20 has a built-in heater, it needs to be formed of a heat-resistant material, and it is not formed of a material having a high friction coefficient in order to prevent toner adhesion. Therefore, in general, the friction coefficient of the press roller 21 is made higher than that of the heat roller 20 to enhance the conveying force of the paper 23. Therefore, the conveying force of the paper 23 depends on the press roller 21, but the peripheral speed of the press roller 21 is fast in the central part and becomes slower toward both ends, so that the paper 23 is pulled from the outside toward the central part. Power acts. As a result, there is a problem that the paper 23 is wrinkled.
問題点を解決するための手段 この考案は、ヒータが内蔵されたヒートローラと、少な
くとも外周面がヒートローラの外周面の摩擦係数より高
い摩擦係数をもつて前記ヒートローラに弾発的に接触す
るプレスローラとを、両者の何れか一方をモータに連結
して回転自在に設け、前記ヒートローラの外周面に中央
部から両端部に向かうに従い外径が次第に細くなる膨出
面を形成し、前記プレスローラの外周面に前記膨出面の
曲率半径と一致する凹状の用紙押圧面を形成したことを
特徴とする。Means for Solving the Problems The present invention relates to a heat roller having a built-in heater, and at least the outer peripheral surface thereof elastically contacts the heat roller with a friction coefficient higher than that of the outer peripheral surface of the heat roller. A press roller is rotatably provided by connecting either one of them to a motor, and an outer peripheral surface of the heat roller is formed with a bulging surface whose outer diameter is gradually reduced from the central portion toward both ends, It is characterized in that a concave paper pressing surface that matches the radius of curvature of the bulging surface is formed on the outer peripheral surface of the roller.
作用 したがつて、用紙を搬送する主導権をもつ摩擦係数の高
いプレスローラの周速度は、中央部から両端部に向かう
に従い次第に速くなるため、用紙には中央部から両側部
に向かう引張力が作用する。As a result, the peripheral speed of the press roller, which has the initiative to convey the paper and has a high friction coefficient, gradually increases from the center to both ends, and therefore the paper has a tensile force from the center to both sides. To work.
実施例 この考案の一実施例を第１図及び第２図に基づいて説明
する。１は金属製のヒートローラで、このヒートローラ
１の両端には中空の軸２が突出されている。３は外周部
が耐熱性シリコンゴム等の摩擦係数が高い材料により形
成されたプレスローラで、このプレスローラ３の両端に
は軸４が突出されている。また、ヒートローラ１の外周
面には中央部から両端部に向かうに従い外径が次第に細
くなる膨出面５が形成され、プレスローラ３の外周面に
は膨出面５の曲率半径と一致する凹状の用紙押圧面６が
形成されている。さらに、ヒートローラ１にはヒータ７
が内蔵されている。このヒータ７は中空の軸２の両端か
ら外部に引き出されて電源接続される。なお、図示しな
いが、軸2,4はフレームに固定された軸受に回転自在に
支承され、軸４はモータに連結されている。また、軸２
を支承する軸受又は軸４を支承する軸受を一方に付勢す
ることにより、ヒートローラ１とプレスローラ３とは弾
発的に接触するものである。Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 and 2. Reference numeral 1 denotes a metal heat roller, and hollow shafts 2 project from both ends of the heat roller 1. Reference numeral 3 denotes a press roller whose outer peripheral portion is formed of a material having a high friction coefficient such as heat resistant silicon rubber, and a shaft 4 is projected at both ends of the press roller 3. A bulging surface 5 is formed on the outer peripheral surface of the heat roller 1, the outer diameter of which gradually decreases from the central portion toward both ends. A paper pressing surface 6 is formed. Further, the heater 7 is attached to the heat roller 1.
Is built in. The heater 7 is pulled out from both ends of the hollow shaft 2 and connected to the power source. Although not shown, the shafts 2 and 4 are rotatably supported by bearings fixed to the frame, and the shaft 4 is connected to the motor. Also, axis 2
The heat roller 1 and the press roller 3 are elastically brought into contact with each other by urging the bearing for supporting the bearing or the bearing for supporting the shaft 4 toward one side.
このような構成において、モータによりプレスローラ３
を駆動すると、転写工程を経た用紙８がヒートローラ１
膨出面５とプレスローラ３の用紙押圧面６とにより挾持
され、この挾持力とヒータ７の熱とにより用紙８上の転
写画像が定着される。一方、用紙８の搬送作用の主導権
は摩擦係数が高く、かつ、モータに連結されて駆動力の
強いプレスローラ３にあり、しかも、プレスローラ３の
周速度は中央部から両端部に向かうに従い次第に速くな
るため、用紙８には中央部から両側部に向かう引張力が
作用する。したがつて、用紙８にしわがよることを確実
に防止することができる。In such a configuration, the press roller 3 is driven by the motor.
When the sheet is driven, the paper 8 that has undergone the transfer process is transferred to the heat roller 1.
The bulging surface 5 and the paper pressing surface 6 of the press roller 3 hold it, and the held image and the heat of the heater 7 fix the transferred image on the paper 8. On the other hand, the leading action of the conveyance action of the sheet 8 is the press roller 3 which has a high friction coefficient and is connected to the motor and has a strong driving force, and moreover, the peripheral speed of the press roller 3 goes from the central part to both ends. Since the speed is gradually increased, a tensile force is applied to the sheet 8 from the central portion toward both side portions. Therefore, it is possible to reliably prevent the paper 8 from wrinkling.
考案の効果 この考案は上述のように構成したので、用紙を搬送する
主導権をもつ摩擦係数の高いプレスローラの周速度を、
中央部から両端部に向かうに従い次第に速くすることが
でき、これにより、用紙には中央部から両側部に向かう
引張力が作用するため、用紙にしわがよることを確実に
防止することができる効果を有する。Effect of the Invention Since the invention is configured as described above, the peripheral speed of the press roller having a high friction coefficient, which takes the initiative in conveying the paper,
The speed can be gradually increased from the central part toward both ends, and as a result, a pulling force acting from the central part to both sides acts on the paper, which can reliably prevent the paper from wrinkling. Have.
第１図及び第２図はこの考案の一実施例を示すもので、
第１図は正面図、第２図は側面図、第３図は従来例を示
す正面図である。 １……ヒートローラ、３……プレスローラ、５……膨出
面、６……用紙押圧面1 and 2 show one embodiment of the present invention,
FIG. 1 is a front view, FIG. 2 is a side view, and FIG. 3 is a front view showing a conventional example. 1 ... Heat roller, 3 ... Press roller, 5 ... Bulging surface, 6 ... Paper pressing surface
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭54−163040（ＪＰ，Ａ) 特開 昭52−40342（ＪＰ，Ａ) 特開 昭52−153449（ＪＰ，Ａ) 特開 昭53−9127（ＪＰ，Ａ) 特開 昭56−19066（ＪＰ，Ａ) 特開 昭58−16274（ＪＰ，Ａ) 特開 昭58−184173（ＪＰ，Ａ) 実開 昭62−84065（ＪＰ，Ｕ) 実開 昭60−163462（ＪＰ，Ｕ) 実開 昭59−48552（ＪＰ，Ｕ) 実開 昭58−121063（ＪＰ，Ｕ) 実開 昭58−93955（ＪＰ，Ｕ) 実開 昭58−40755（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-54-163040 (JP, A) JP-A-52-40342 (JP, A) JP-A-52-153449 (JP, A) JP-A-53- 9127 (JP, A) JP 56-19066 (JP, A) JP 58-16274 (JP, A) JP 58-184173 (JP, A) Actual development JP 62-84065 (JP, U) Actually open 60-163462 (JP, U) Actually open 59-48552 (JP, U) Actually open 58-121063 (JP, U) Actually open 58-93955 (JP, U) Actually open 58-40755 (JP, U)
Claims (1)
くとも外周面がヒートローラの外周面の摩擦係数より高
い摩擦係数をもつて前記ヒートローラに弾発的に接触す
るプレスローラとを、両者の何れか一方をモータに連結
して回転自在に設け、前記ヒートローラの外周面に中央
部から両端部に向かうに従い外径が次第に細くなる膨出
面を形成し、前記プレスローラの外周面に前記膨出面の
曲率半径と一致する凹状の用紙押圧面を形成したことを
特徴とする電子写真装置の定着装置。1. A heat roller having a built-in heater, and a press roller at least whose outer peripheral surface has a friction coefficient higher than that of the outer peripheral surface of the heat roller and elastically contacts the heat roller. One of them is rotatably provided by being connected to a motor, and an outer peripheral surface of the heat roller is formed with a bulging surface whose outer diameter is gradually reduced from the central portion toward both ends, and the outer peripheral surface of the press roller is bulged. A fixing device for an electrophotographic apparatus, characterized in that a concave paper pressing surface having a radius of curvature of the projecting surface is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988024383U JPH0743731Y2 (en) | 1988-02-25 | 1988-02-25 | Fixing device for electrophotographic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988024383U JPH0743731Y2 (en) | 1988-02-25 | 1988-02-25 | Fixing device for electrophotographic device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01128357U JPH01128357U (en) | 1989-09-01 |
| JPH0743731Y2 true JPH0743731Y2 (en) | 1995-10-09 |
Family
ID=31244186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988024383U Expired - Lifetime JPH0743731Y2 (en) | 1988-02-25 | 1988-02-25 | Fixing device for electrophotographic device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0743731Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5493612B2 (en) * | 2009-09-10 | 2014-05-14 | 株式会社リコー | Image forming method, toner and process cartridge |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54163040A (en) * | 1978-06-15 | 1979-12-25 | Ricoh Co Ltd | Fixing device |
-
1988
- 1988-02-25 JP JP1988024383U patent/JPH0743731Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01128357U (en) | 1989-09-01 |
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