JP2506788B2 - Heat fixing device - Google Patents
Heat fixing deviceInfo
- Publication number
- JP2506788B2 JP2506788B2 JP62171676A JP17167687A JP2506788B2 JP 2506788 B2 JP2506788 B2 JP 2506788B2 JP 62171676 A JP62171676 A JP 62171676A JP 17167687 A JP17167687 A JP 17167687A JP 2506788 B2 JP2506788 B2 JP 2506788B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- temperature
- heat
- sliding member
- roller
- 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
- Fixing For Electrophotography (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、加熱定着装置に関するもので、詳しくは、
画像形成装置に用いられる加熱定着装置に関するもので
ある。The present invention relates to a heat fixing device, and more specifically,
The present invention relates to a heat fixing device used in an image forming apparatus.
［従来の技術］ 従来のこの種の加熱定着装置は、所定の温度に維持さ
れて駆動される加熱ローラと、これに対向して圧接従動
する加圧ローラとで、被定着物を挟持搬送しながら加熱
加圧定着するようになっている。[Prior Art] A conventional heating and fixing device of this type sandwiches and conveys an object to be fixed by a heating roller that is driven to be maintained at a predetermined temperature and a pressure roller that is pressed and driven in opposition to the heating roller. While fixing with heat and pressure.
［発明が解決しようとする問題点］ 前従のように、従来の加熱定着装置においては、加熱
ローラと加圧ローラとで構成されているので、所定の加
圧力を維持するためには、加熱ローラおよび加圧ローラ
の機械的な強度が必要となり、該両ローラの小径化には
限界が生じ、また該両ローラの各端部で加圧する機構が
多用されているため、小径化によってローラがたわみ易
くなると、ローラの長手方向において中央部の圧接が著
しく低下し、部分的な定着不良を生じ、しかも、加熱ロ
ーラの温度を検出するために所定の圧力をもって加熱ロ
ーラに当接している温度検出素子も、加熱ローラのたわ
みによってその当接位置および圧接力が変動し易くな
り、加熱ローラの温度を所定の値に維持することが困難
であるなどの問題点がある。本発明は、このような問題
点を解決しようとするものである。すなわち、本発明
は、圧接力を長手方向に亙って均一化することが可能と
なり、小型で安定した定着性能を有する加熱定着装置を
提供することを目的とするものである。[Problems to be Solved by the Invention] As in the prior art, since the conventional heating and fixing device is composed of the heating roller and the pressure roller, in order to maintain a predetermined pressing force, heating is required. Since the mechanical strength of the roller and the pressure roller is required, there is a limit to the reduction of the diameter of both rollers, and a mechanism for applying pressure at each end of the both rollers is often used. If it becomes easier to bend, the pressure contact at the center of the roller in the longitudinal direction will be significantly reduced, causing partial fixing failure. Moreover, the temperature detection that is in contact with the heating roller with a predetermined pressure to detect the temperature of the heating roller The element also has a problem that the contact position and the pressure contact force of the element easily change due to the deflection of the heating roller, and it is difficult to maintain the temperature of the heating roller at a predetermined value. The present invention is intended to solve such a problem. That is, it is an object of the present invention to provide a small-sized heat fixing device capable of making the pressure contact force uniform in the longitudinal direction and having a stable fixing performance.
［問題点を解決するための手段］ 上記目的を達成するために、本発明は、発熱源を備え
た回転部材と、この回転部材と圧接し摺動するシートを
備えた摺動部材と、前記回転部材の温度を検知する温度
検知素子と、を有し、前記回転部材と前記摺動部材の圧
接部で未定着像を担持した記録材を挟持搬送し加熱定着
を行う加熱定着装置において、前記温度検知素子は前記
摺動部材のシートを介して前記回転部材と当接すること
を特徴とする。[Means for Solving the Problems] In order to achieve the above object, the present invention relates to a rotating member including a heat source, a sliding member including a sheet that presses against the rotating member and slides, A temperature detecting element for detecting the temperature of a rotating member, wherein the recording material carrying an unfixed image is nipped and conveyed at a pressure contact portion between the rotating member and the sliding member to perform heat fixing, The temperature detecting element is in contact with the rotating member via the sheet of the sliding member.
［作用］ 本発明によれば、加熱定着ローラと加圧摺動部材とで
搬送定着することによって、圧接力が長手方向に亙って
均一化し、小型で安定した定着性能が得られる。[Operation] According to the present invention, by carrying and fixing by the heating fixing roller and the pressure sliding member, the pressure contact force is made uniform in the longitudinal direction, and a small and stable fixing performance is obtained.
［実施例］ 第１図は本発明の第１実施例を示している。第１図に
おいて、１は加熱定着ローラ、２は発熱源、３は加圧摺
動部材、４は加圧ばね、５は底板、６はサーモスタッ
ト、７はオイル塗布材、８は枠体、９は電極、10は加圧
基板である。すなわち、加熱定着ローラ１は中空円筒状
のローラであり、内部に加熱源２としてハロゲンヒータ
を有し、回転駆動可能に底板５に支持されている。加圧
摺動部材３は加圧板軸17を支持点として揺動自在に支持
されており、底板５に支持された複数の加圧ばね４によ
って所定の圧力で加熱定着ローラ１に圧接しており、回
転駆動される加熱定着ローラ１の外周面の長手方向に亙
って均一に圧接している。また加熱定着ローラ１の周囲
には、枠体８に支持され、かつ、電極９によってハロゲ
ンヒータの発熱源２に直列に接続された安全装置として
サーモスタット６と、オイル塗布部材７とが配設されて
いる。そして、枠体８の被定着物20の入口側と排出側は
加熱定着ローラ１に近接しており、それぞれ搬送ガイド
の役割りをしている。シート状の被定着物20は、回転駆
動されている加熱定着ローラ１に対して加圧摺動部材３
によって圧接することにより搬送されながら加熱加圧定
着される。この際、被定着物20に対する摩擦抗力は、加
圧摺動部材３よりも加熱定着ローラ１のほうが大きくな
ければならない。[Embodiment] FIG. 1 shows a first embodiment of the present invention. In FIG. 1, 1 is a heat fixing roller, 2 is a heat source, 3 is a pressure sliding member, 4 is a pressure spring, 5 is a bottom plate, 6 is a thermostat, 7 is an oil coating material, 8 is a frame, and 9 is a frame. Is an electrode and 10 is a pressure substrate. That is, the heat fixing roller 1 is a hollow cylindrical roller, has a halogen heater as a heat source 2 therein, and is rotatably supported by the bottom plate 5. The pressure sliding member 3 is swingably supported with a pressure plate shaft 17 as a support point, and is pressed against the heat fixing roller 1 with a predetermined pressure by a plurality of pressure springs 4 supported by the bottom plate 5. The heating and fixing roller 1 that is rotationally driven is uniformly pressed against the outer peripheral surface in the longitudinal direction. A thermostat 6 and an oil applying member 7 are provided around the heat fixing roller 1 as a safety device supported by the frame 8 and connected in series to the heat source 2 of the halogen heater by the electrode 9. ing. The inlet side and the discharge side of the object to be fixed 20 of the frame body 8 are close to the heat fixing roller 1, and each serve as a conveyance guide. The sheet-shaped object 20 to be fixed is pressed against the heat-fixing roller 1 which is rotationally driven by the pressure sliding member 3.
It is heated and pressed and fixed while being conveyed by being pressed against. At this time, the frictional drag force against the object to be fixed 20 must be larger in the heat fixing roller 1 than in the pressure sliding member 3.
第２図は第１図の圧接部の一部を拡大して示してい
る。この実施例における加熱定着ローラ１は、直径19m
m、肉厚2mmのアルミ製円筒状芯金15の外周面に厚さ500
μのシリコーンゴム層16を設けており、端部に取付けら
れた駆動歯車（図示せず）を介して回転駆動される。加
圧摺動部材３は、PPS等の耐熱性樹脂で成形された加圧
基板10の上に摺動性の高い耐熱性樹脂シートとしてふっ
素樹脂系のPFAシート（50μ厚）11を設け、このシート1
1が加熱定着ローラ１および被定着物20の裏面との接触
面となる。この加圧摺動部材３は長手方向に亙って配置
された複数の加圧ばね４により均一に加圧されている。
また被定着物20が通過する部分の加熱定着ローラ１との
圧接部には、加圧基板10に凹部を設けて、弾性体として
シリコーンスポンジ13を介して温度検知素子としてNTC
サーミスタ12が設けられており、当接圧および当接位置
共に安定している。サーミスタ12はリード線14によって
温度調節器（図示せず）に接続されるとともに、該シー
ト11を介して加熱定着ローラ１のシリコーンゴム層16ま
たは被定着物20の裏面に当接する。サーミスタ12の検出
信号によって温度調節器が作動され、発熱源２を駆動
し、所定の温度に維持するように構成されている。FIG. 2 shows a part of the pressure contact portion of FIG. 1 in an enlarged manner. The heat fixing roller 1 in this embodiment has a diameter of 19 m.
500 mm thick on the outer peripheral surface of an aluminum cylindrical core 15 with a wall thickness of 2 mm
A .mu. silicone rubber layer 16 is provided and is rotationally driven via a drive gear (not shown) attached to the end. The pressure sliding member 3 is provided with a fluororesin PFA sheet (50 μ thick) 11 as a heat-resistant resin sheet having high slidability on a pressure substrate 10 formed of a heat-resistant resin such as PPS. Sheet 1
The reference numeral 1 is the contact surface between the heat fixing roller 1 and the back surface of the object 20 to be fixed. The pressure sliding member 3 is uniformly pressed by a plurality of pressure springs 4 arranged in the longitudinal direction.
In addition, a concave portion is provided in the pressing substrate 10 at a portion where the object to be fixed 20 passes with the heat fixing roller 1, and a concave portion is provided in the pressure substrate 10, and a silicone sponge 13 as an elastic body is used to form an NTC as a temperature detecting element.
The thermistor 12 is provided, and the contact pressure and the contact position are stable. The thermistor 12 is connected to a temperature controller (not shown) by a lead wire 14 and contacts the silicone rubber layer 16 of the heat fixing roller 1 or the back surface of the object to be fixed 20 via the sheet 11. The temperature controller is actuated by the detection signal of the thermistor 12 to drive the heat source 2 and maintain it at a predetermined temperature.
第３図はこの実施例におけるサーミスタ12の検出温度
の時間的変化を示している。この実施例では、サーミス
タ検出温度が180℃よりも低い場合には発熱源２を発熱
させ、185℃よりも高くなった場合に発熱源２の発熱を
停止するように温度調節しており、第３図には発熱源２
のオン・オフを併記している。加熱定着ローラ１は外周
面の周速が30mm毎秒となるように回転している。第３図
のは64gr/m2のA4サイズ紙、は52gr/m2のA4サイズ紙
に、樹脂等からなる粉体トナー像を形成し、定着処理し
た例を示す。定着処理中は、サーミスタ12が紙の裏面に
当接するので、加熱定着ローラ１の表面温度よりも格段
に低い温度を検出することになり、発熱源２のハロゲン
ヒータは連続点灯する。この時の加熱定着ローラ１の最
大表面温度は通常よりも高くはなるが、被定着物20に伝
熱されるため、危険な温度になることはない。FIG. 3 shows the change over time in the temperature detected by the thermistor 12 in this embodiment. In this embodiment, when the thermistor detection temperature is lower than 180 ° C., the heat source 2 is caused to generate heat, and when it becomes higher than 185 ° C., the heat generation of the heat source 2 is stopped so that the temperature is adjusted. Heat source 2 is shown in FIG.
The on / off of is also described. The heat fixing roller 1 is rotated so that the peripheral speed of the outer peripheral surface is 30 mm / sec. FIG. 3 shows an example in which a powder toner image made of a resin or the like is formed on A4 size paper of 64 gr / m 2 and A4 size paper of 52 gr / m 2 and fixed. During the fixing process, the thermistor 12 is in contact with the back surface of the paper, so that a temperature much lower than the surface temperature of the heat fixing roller 1 is detected, and the halogen heater of the heat source 2 is continuously turned on. The maximum surface temperature of the heating and fixing roller 1 at this time becomes higher than usual, but since the heat is transferred to the object to be fixed 20, it does not reach a dangerous temperature.
第３図に示したように、定着処理が行なわれている場
合は、サーミスタ12の検出温度が格段に低下するので、
サーミスタ12の検出温度の変化を検出することにより、
被定着物20の突入および排出を判断することが可能であ
る。この実施例では140℃以下を検出した時に被定着物
の突入として判断し、また再び140℃以上を検出した時
に被定着物20の排出と判断している。このことにより、
排紙センサ等の特別な部材を用いずに、確実に被定着物
20の検出が可能となり、さらに、昇温時にサーミスタ検
出温度の変化率を比較することにより、万一転写紙が圧
接部に残留している場合でも、異常と検出することが可
能となり、安全性も向上する。As shown in FIG. 3, when the fixing process is performed, the temperature detected by the thermistor 12 is significantly reduced.
By detecting the change in the temperature detected by the thermistor 12,
It is possible to judge the entry and discharge of the fixed object 20. In this embodiment, when 140 ° C. or lower is detected, it is determined that the object to be fixed has entered, and when 140 ° C. or higher is detected again, the object to be fixed 20 is discharged. By this,
Securely fix objects without using special members such as paper ejection sensors
20 can be detected, and by comparing the rate of change in thermistor detection temperature when the temperature rises, it is possible to detect an abnormality even if transfer paper remains in the press contact area, thus ensuring safety. Also improves.
第４図は本発明の第２実施例を示している。この実施
例では、加圧摺動部材３として半円筒状のものを用いて
いる。すなわち、加圧摺動部材３には、シリコーンゴム
等の弾性層（3mm厚）18を設けており、圧接部の圧接幅
を大きくしている。また加圧ばね４として板ばねを用い
て、両端および中央部の３点で加圧摺動部材３を加圧支
持している。FIG. 4 shows a second embodiment of the present invention. In this embodiment, a semi-cylindrical member is used as the pressure sliding member 3. That is, the pressurizing sliding member 3 is provided with an elastic layer (3 mm thick) 18 such as silicone rubber to increase the press-contact width of the press-contact portion. Further, a leaf spring is used as the pressure spring 4, and the pressure sliding member 3 is pressure-supported at both ends and the central portion.
この第２実施例では、圧接幅を大きくとることが可能
となり、前述した第１実施例に比較して、より高速で定
着処理を行なうことができる。またサーミスタ12の当接
に関しても弾性体による当接向上が達成される。In the second embodiment, it is possible to increase the pressure contact width, and the fixing process can be performed at a higher speed than in the first embodiment described above. Further, with respect to the contact of the thermistor 12, the improvement of contact by the elastic body is achieved.
［発明の効果］ 本発明は、回転駆動される加熱定着ローラと、これに
対向圧接する加圧摺動部材とで、加熱定着装置を構成し
たため、圧接力を長手方向に亙って均一化することが可
能となり、小型で安定した定着性能を得ることができ
る。なお加圧摺動部材に温度検出素子を埋設して温度制
御を行なうようにすれば、安定した温度制御、検出温度
変化率による被定着物の突入排出の判断などが可能とな
る。EFFECTS OF THE INVENTION In the present invention, the heat fixing device is composed of the heat-fixing roller that is rotationally driven and the pressure sliding member that is in pressure contact with the heat-fixing roller. Therefore, the pressure contact force is made uniform in the longitudinal direction. This makes it possible to obtain a compact and stable fixing performance. By embedding a temperature detecting element in the pressure sliding member so as to control the temperature, it becomes possible to perform stable temperature control and to judge whether the fixed object is rushed into or discharged from the detected temperature change rate.
第１図は本発明の第１実施例を示した断面図、第２図は
第１図の一部を拡大して示した断面図、第３図は第１図
のサーミスタの検出温度の説明図、第４図は本発明の第
２実施例を示した断面図である。 １…加熱定着ローラ、２…発熱源、３…加圧摺動部材、
４…加圧ばね、６…サーモスタット、９…電極、12…サ
ーミスタ、16…シリコーンゴム層、18…弾性層、20…被
定着物FIG. 1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is an enlarged sectional view showing a part of FIG. 1, and FIG. 3 is an explanation of the temperature detected by the thermistor of FIG. 4 and 5 are sectional views showing a second embodiment of the present invention. 1 ... Heat fixing roller, 2 ... Heat source, 3 ... Pressure sliding member,
4 ... Pressure spring, 6 ... Thermostat, 9 ... Electrode, 12 ... Thermistor, 16 ... Silicone rubber layer, 18 ... Elastic layer, 20 ... Fixed object
Claims (1)
と圧接し摺動するシートを備えた摺動部材と、前記回転
部材の温度を検知する温度検知素子と、を有し、前記回
転部材と前記摺動部材の圧接部で未定着像を担持した記
録材を挟持搬送し加熱定着を行う加熱定着装置におい
て、 前記温度検知素子は前記摺動部材のシートを介して前記
回転部材と当接することを特徴とする加熱定着装置。1. A rotary member having a heat source, a sliding member having a sheet that is brought into pressure contact with and slides on the rotary member, and a temperature detecting element for detecting the temperature of the rotary member. In a heat fixing device for sandwiching and transporting a recording material carrying an unfixed image at a pressure contact portion of a rotating member and the sliding member, the temperature detecting element is connected to the rotating member via a sheet of the sliding member. A heating and fixing device characterized by being in contact with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62171676A JP2506788B2 (en) | 1987-07-09 | 1987-07-09 | Heat fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62171676A JP2506788B2 (en) | 1987-07-09 | 1987-07-09 | Heat fixing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6415780A JPS6415780A (en) | 1989-01-19 |
| JP2506788B2 true JP2506788B2 (en) | 1996-06-12 |
Family
ID=15927631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62171676A Expired - Fee Related JP2506788B2 (en) | 1987-07-09 | 1987-07-09 | Heat fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2506788B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3158030B2 (en) * | 1995-12-14 | 2001-04-23 | シャープ株式会社 | Fixing device |
| JP5049526B2 (en) * | 2006-07-13 | 2012-10-17 | 株式会社リコー | Fixing device, image forming apparatus |
| JP5108262B2 (en) * | 2006-07-12 | 2012-12-26 | 株式会社リコー | Fixing device, image forming apparatus |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5536996B2 (en) * | 1973-05-09 | 1980-09-25 | ||
| JPS50106644A (en) * | 1974-01-18 | 1975-08-22 | ||
| JPS50134655A (en) * | 1974-04-11 | 1975-10-24 | ||
| JPS608966U (en) * | 1983-06-29 | 1985-01-22 | 京セラミタ株式会社 | heat fixing device |
| JPS6033362U (en) * | 1983-08-16 | 1985-03-07 | 京セラミタ株式会社 | Heat fixing unit in copying machine |
| JPS60238879A (en) * | 1984-05-11 | 1985-11-27 | Matsushita Electric Ind Co Ltd | Heat roller fixing device |
| US4689471A (en) * | 1986-01-17 | 1987-08-25 | Xerox Corporation | Heat and pressure fuser for fixing toner images to copy substrates |
| JPS6362861U (en) * | 1986-10-15 | 1988-04-26 |
-
1987
- 1987-07-09 JP JP62171676A patent/JP2506788B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6415780A (en) | 1989-01-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |