JP2001183930A5

JP2001183930A5 -

Info

Publication number: JP2001183930A5
Application number: JP1999370154A
Authority: JP
Filing date: 1999-12-27
Publication date: 2007-02-15

Description

図１６は最大通紙幅がＡ３サイズであるフィルム加熱定着方式による従来の加熱装置を示す概略構成図である。１０１はステーであり、このステー１０１は加熱体１０３を露呈させて支持した横断面Ｕ字状の本体部１０５と該本体部を対向する加圧ローラ１０４側へ加圧する加圧部１０６とで構成されている。１０２はステー１０１に外嵌させてある横断面円形の耐熱性フィルム（以下、フィルムと略称する）である。 FIG. 16 is a schematic configuration diagram showing a conventional heating device by a film heating fixing method having a maximum paper passing width of A3 size. Reference numeral 101 denotes a stay, which is composed of a main body portion 105 having a U-shaped cross section that exposes and supports the heating body 103, and a pressurizing portion 106 that pressurizes the main body portion toward the opposing pressurizing roller 104. Has been done. Reference numeral 102 denotes a heat-resistant film having a circular cross section (hereinafter, abbreviated as a film) fitted to the stay 101.

図１５は上記加熱体１０３の途中を省略し、一部切り欠いた平面図である。この加熱体１０３はフィルム１０２もしくは被加熱体としての紙等の記録材Ｐの搬送方向ａに対して直角方向を長手とする細長の耐熱性・絶縁性・良熱伝導性の基板１３１、この基板１３１の表面側の短手方向中央部に基板長手に沿って形成具備させた抵抗発熱体１３２、この抵抗発熱体を形成した加熱体表面を保護させた耐熱性オーバーコート層１３４、抵抗発熱体１３２の長手両端部の給電用電極１３３・１３３とともに、基板裏面側に具備させた加熱体温度を検知するサーミスタ等の検温素子１０７等からなる全体に低熱容量の線状加熱体を基板構成体とする。この加熱体１０３は抵抗発熱体１３２を図１６において、剛性・耐熱性を有するステー本体部１０５の下面側に下向きに露呈させて固定配設してある。 FIG. 15 is a plan view in which the middle of the heating body 103 is omitted and a part thereof is cut out. The heating element 103 is an elongated heat-resistant, insulating, and good-heat conductive substrate 131 having a length perpendicular to the conveying direction a of a recording material P such as a film 102 or paper as a heating element. A resistance heating element 132 formed and provided along the length of the substrate in the central portion on the surface side of the 131 in the lateral direction, a heat-resistant overcoat layer 134 that protects the surface of the heating element on which the resistance heating element is formed, and a resistance heating element 132. A linear heating element having a low heat capacity as a whole is made of a heating element 107 or the like such as a thermista provided on the back surface side of the substrate together with the power feeding electrodes 133 and 133 at both ends of the longitudinal end of the substrate. .. In FIG. 16, the heating element 103 is fixedly arranged by exposing the resistance heating element 132 downward to the lower surface side of the stay main body 105 having rigidity and heat resistance.

上記加熱体１０３の基板１３１は、例えば、アルミナや窒化アルミニウム等の厚み１ｍｍ・幅１０ｍｍ・長さ３３０ｍｍのものである。また、抵抗発熱体１３２は例えば、Ａｇ／Ｐｄ（銀パラジウム）、ＲｕＯ_２、Ｔａ_２Ｎ等の電気抵抗材料をスクリーン印刷等により、厚み約１０μｍ、幅１〜３ｍｍの線状もしくは細帯状に塗工して形成したものである。 The substrate 131 of the heating body 103 is, for example, one having a thickness of 1 mm , a width of 10 mm, and a length of 330 mm, such as alumina or aluminum nitride. Further, the resistance heating element 132 is, for example, _{coated with an electric resistance material such as Ag / Pd (silver-palladium), RuO 2} , Ta ₂ N or the like by screen printing or the like in a linear or strip shape having a thickness of about 10 μm and a width of 1 to 3 mm. It was formed by working.

この種の所謂テンションレスタイプの加熱装置は、例えば特開平４−４４０７５号公報〜特開平４−４４０８３号公報、特開平４−２０４９８０号公報〜特開平４−２０４９８４号公報等に開示されている。 This kind of so-called tensionless type heating device is disclosed in, for example, JP-A-4-44075 to JP-A-4-44083, JP-A-4-204980 to JP-A-4-204984, and the like. ..

即ち、検温素子１０７の検知温度が所定の設定温度より低いと加熱体１０３が昇温するように、また、高い場合は加熱体１０３が降温するように通電を制御することで加熱体１０３は定着時、一定の温度に調整される。而して、加熱体１０３の温度が所定に立ち上がり、かつ加圧ローラ１０４の回転によるフィルム１０２の回転周速度が定常化した状態において、画像定着すべき記録材Ｐが加熱体１０３と加圧ローラ１０４とで形成される圧接ニップ部Ｎを挟持搬送されることにより、加熱体１０３の熱がフィルム１０２を介して記録材Ｐに付与され、記録材Ｐ上の未定着顕画像（トナー画像）ｔが記録材Ｐ面に加熱定着される。そして、圧接ニップ部Ｎを通った記録材Ｐはフィルム１０２の面から分離されて搬送される。 That is, the heating body 103 is fixed by controlling the energization so that the heating body 103 raises the temperature when the detection temperature of the temperature measuring element 107 is lower than the predetermined set temperature, and the heating body 103 lowers the temperature when the temperature is high. At times, it is adjusted to a constant temperature. Thus, in a state where the temperature of the heating body 103 rises predeterminedly and the peripheral rotation speed of the film 102 due to the rotation of the pressure roller 104 becomes constant, the recording material P to be image-fixed is the heating body 103 and the pressure roller. By sandwiching and transporting the pressure contact nip portion N formed by 104, the heat of the heating body 103 is applied to the recording material P via the film 102, and the unfixed microscopic image (toner image) t on the recording material P. Is heat-fixed on the P surface of the recording material. Then, the recording material P that has passed through the pressure welding nip portion N is separated from the surface of the film 102 and conveyed.

上記フィルム１０２はステー１０１に対し周長が余裕を持ってルーズに外嵌しているため図１７に示すようにフィルム１０２とステー１０１の間に隙間を持っており、記録材Ｐがニップ部Ｎに侵入する前、フィルム１０２はステー１０１に対し図１７（ａ）に示す端部、図１７（ｂ）に示す中央部ともに同じ隙間Ｓ _０を持って回転している。 Since the film 102 is loosely fitted to the stay 101 with a margin in circumference , there is a gap between the film 102 and the stay 101 as shown in FIG. 17, and the recording material P is the nip portion N. The film 102 rotates with respect to the stay 101 with the same gap S ₀ at both the end portion shown in FIG. 17 (a) and the central portion shown in FIG. 17 (b).

すると、加圧ローラ１０４の周速も非通紙部の方が速くなる。つまり、ニップ部Ｎでのフィルム１０２の搬送速度が通紙部より非通紙部の方が大きくなり、速度差が生じ、フィルム１０２は通紙部と非通紙部でねじれ力が働き、ニップ部Ｎの直前でフィルム１０２とステー１０１の間の隙間量が端部では図１８（ａ）に示すように隙間Ｓ_１と小さく、中央部では図１８（ｂ）に示すように隙間Ｓ_２と大きくなり、Ｓ _２＞Ｓ０＞Ｓ _１という関係になるため、図１１に示すようにニップ部Ｎの直前でフィルム１０２が１０２’のようにたるんだ状態になる。 Then, the peripheral speed of the pressurizing roller 104 is also faster in the non-paper-passing portion. That is, the transport speed of the film 102 at the nip portion N is higher in the non-passing portion than in the passing portion, causing a speed difference, and the film 102 exerts a twisting force between the passing portion and the non-passing portion, resulting in a nip. gap amount between the immediately preceding the film 102 and the stay 101 parts N is the end as small as the clearance S ₁ as shown in FIG. 18 (a), in the central portion and the gap S _2, as shown in FIG. 18 (b) increases, since the relationship of _{_S} 2> S0> _S _1, the film 102 immediately before the nip portion N as shown in FIG. 11 is loosened state as 102 '.

図において、１はフィルム支持手段としてのステーであり、このステー１は加熱体３を露呈させて支持した横断面Ｕ字状のフィルムガイド５と、このフィルムガイド５に組み付け、該ガイド５を対向する加圧体としての加圧ローラ４側に加圧する横断面コの字状の加圧部６とから構成されている。２（図２）はステー１に外嵌させてある横断面円形の耐熱フィルム（薄膜フィルム）であり、このフィルム２は内周長が加熱体３を含むステーの外周長に対し例えば３ｍｍ程度大きくしてある。したがってステー１に対し周長に余裕をもってルーズに外嵌されている。このステー１はフィルム２を介して加圧ローラ４で長手方向全体に加圧され、ニップ部Ｎを形成している。 In the figure, reference numeral 1 denotes a stay as a film supporting means, and the stay 1 is attached to a film guide 5 having a U-shaped cross section that exposes and supports the heating body 3, and the guide 5 is opposed to the film guide 5. It is composed of a pressurizing portion 6 having a U-shaped cross section that pressurizes the pressurizing roller 4 side as a pressurizing body. 2 (FIG. 2) is a heat-resistant film (thin film) having a circular cross section that is externally fitted to the stay 1. The inner peripheral length of this film 2 is, for example, about 3 mm with respect to the outer peripheral length of the stay including the heating body 3. It is enlarged. Therefore, it is loosely fitted to the stay 1 with a margin in the circumference. The stay 1 is pressed in the entire longitudinal direction by the pressure roller 4 via the film 2 to form the nip portion N.

図３に示した加熱装置においても前述の図２に記載の本実施形態の加熱装置と同様に小サイズの紙シワを防止できるが、最大通紙幅であるＡ３サイズのように通紙幅が広い記録材を通紙すると、図５に示すように前述の大きいサイズのシワ対策である長手方向端部方向への引き延ばし効果により、加熱装置ニップ上流部において記録材端部がフィルム方向に盛り上がる。よって、加熱装置上流部において記録材上の未定着画像とフィルムが接触し、画像の乱れが発生することがある。 Although it is possible to prevent the creases of small size like the heating apparatus of the present embodiment shown in Figure 2 described above in the heating apparatus shown in FIG. 3, passing width is wide recorded as A3 size which is the maximum sheet passing width When the material is passed through the paper, as shown in FIG. 5, the recording material end portion rises in the film direction at the upstream portion of the heating device nip due to the stretching effect in the longitudinal direction end portion direction, which is a measure against wrinkles of a large size described above. Therefore, the unfixed image on the recording material may come into contact with the film in the upstream portion of the heating device, and the image may be distorted.

（第６の実施形態）
図１３は第６の実施形態における加熱装置を示す概要図であり、（ａ）はニップ下流から見た斜視図、（ｂ）と（ｃ）はその一部の側面図である。 (Sixth Embodiment)
13A and 13B are schematic views showing a heating device according to a sixth embodiment, FIG. 13A is a perspective view seen from the downstream side of the nip, and FIGS. 13B and 13C are side views thereof.

【符号の説明】
１ステー（フィルム支持手段）
２フィルム
３加熱体
４加圧ローラ（加圧体）
５フィルムガイド
５ａ，５ｂ，５ｃ，５ｄ突状部
６加圧部
８突状部
９端部体
Ｎニップ部
Ｐ記録材 [Explanation of symbols]
1 stay (film support means)
2 Film 3 Heating body 4 Pressurizing roller (pressurizing body)
5 Film guides 5a, 5b, 5c, 5d Protruding part 6 Pressurizing part 8 Protruding part 9 End body N Nip part P Recording material