JPH0531838Y2 - - Google Patents
Info
- Publication number
- JPH0531838Y2 JPH0531838Y2 JP1987158498U JP15849887U JPH0531838Y2 JP H0531838 Y2 JPH0531838 Y2 JP H0531838Y2 JP 1987158498 U JP1987158498 U JP 1987158498U JP 15849887 U JP15849887 U JP 15849887U JP H0531838 Y2 JPH0531838 Y2 JP H0531838Y2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- heater
- heating element
- transfer body
- insulating material
- 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
- 238000010438 heat treatment Methods 0.000 claims description 31
- 239000002184 metal Substances 0.000 claims description 22
- 239000011810 insulating material Substances 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 3
- 230000005855 radiation Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001120 nichrome Inorganic materials 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
Landscapes
- Fixing For Electrophotography (AREA)
- Resistance Heating (AREA)
Description
【考案の詳細な説明】
産業上の利用分野
この考案は、転写体の表面に付着した可視トナ
ー像を加熱定着させる電子写真複写機の定着用ヒ
ーターに関する。[Detailed Description of the Invention] Industrial Application Field This invention relates to a fixing heater for an electrophotographic copying machine that heats and fixes a visible toner image attached to the surface of a transfer member.
従来の技術
従来の複写機の定着用ヒーターとしては、例え
ば、両端が開口した直線状の金属パイプと、パイ
プ内に充填された絶縁材と、絶縁材に埋設され螺
旋状のニクロム線等からなる発熱体と、パイプの
両端部にそれぞれ挿入され、内端側が発熱体の端
部に接続されるとともに外端部がパイプから突出
した一対の金属端子と、を備えたものが知られて
いる。しなしながら、このような定着用ヒーター
の両端部は通電によつても発熱しない金属端子を
有し、また、周囲の機器から熱を奪われるため、
中央部より低い温度となつてしまう。このため、
転写体の幅方向両端部に対する加熱が弱くなつて
該部分に定着不良が生じるという問題点があつ
た。このような問題点を解決するため、従来、発
熱体の巻き密度を両端部において高く(ピツチを
小さく)し、これにより定着用ヒーターの両端部
における発熱量を増大させるようにしたものが提
案された。BACKGROUND TECHNOLOGY Conventional fuser heaters for copying machines are made of, for example, a straight metal pipe with both ends open, an insulating material filled in the pipe, and a spiral nichrome wire embedded in the insulating material. A device is known that includes a heating element and a pair of metal terminals that are inserted into both ends of a pipe, and whose inner ends are connected to the ends of the heating element and whose outer ends protrude from the pipe. However, both ends of such a fixing heater have metal terminals that do not generate heat even when energized, and heat is taken away from surrounding equipment.
The temperature will be lower than the center. For this reason,
There was a problem in that the heating at both ends of the transfer member in the width direction became weaker, resulting in poor fixing at those parts. In order to solve these problems, a conventional method has been proposed in which the winding density of the heating element is increased (the pitch is reduced) at both ends, thereby increasing the amount of heat generated at both ends of the fixing heater. Ta.
考案が解決しようとする問題点
しかしながら、このような定着用ヒーターにあ
つては、巻き密度の高い領域での発熱体の温度が
他の領域における発熱体の温度より高温となるた
め、断線し易くなり寿命が短くなるという問題点
がある。さらに、巻き密度が部分的に異なつてい
る発熱体は、その製作が困難であり、また、製作
できたとしても高価となつてしまうという問題点
がある。Problems to be Solved by the Invention However, in such a fixing heater, the temperature of the heating element in the area with high winding density is higher than the temperature of the heating element in other areas, so wire breakage is likely to occur. There is a problem that the lifespan is shortened. Furthermore, it is difficult to manufacture a heating element with partially different winding densities, and even if it could be manufactured, it would be expensive.
問題点を解決するための手段
このような問題点は、転写体の搬送方向に対し
てほぼ直交して直線状に延び両端が開口したパイ
プと、パイプ内に充填された絶縁材と、絶縁材に
埋設された発熱体と、パイプの両端部にそれぞれ
挿入され、内端側が発熱体の端部に接続されると
ともに外端部がパイプから突出した一対の金属端
子と、を備え、金属端子を通じて発熱体に通電す
ることにより、転写体の表面に付着した可視トナ
ー像を加熱定着させる電子写真複写機の定着用ヒ
ーターにおいて、パイプの端部を中央部にほぼ平
行となるよう折り返して発熱体の重なり合い部を
ヒーター端部に形成し、これによつてヒーター端
部における発熱量を増大させることにより解決す
ることができる。Means for Solving the Problems These problems are caused by a pipe that extends in a straight line almost perpendicular to the conveying direction of the transfer body and is open at both ends, an insulating material filled in the pipe, and an insulating material. a heating element embedded in the pipe, and a pair of metal terminals that are inserted into both ends of the pipe, the inner end side is connected to the end of the heating element, and the outer end protrudes from the pipe, and the metal terminal is inserted through the metal terminal. In the fixing heater of an electrophotographic copying machine, which heats and fixes the visible toner image adhered to the surface of the transfer member by applying electricity to the heating element, the end of the pipe is folded back so that it is almost parallel to the center of the heating element. This problem can be solved by forming an overlapping portion at the end of the heater, thereby increasing the amount of heat generated at the end of the heater.
作 用
この考案ではパイプの端部を中央部にほぼ平行
となるよう折り返しているため、通電時にあつて
も発熱しない金属端子はヒーターの中央部寄り
に、一方、発熱を行う発熱体はヒーター端まで位
置するようになり、ヒーターの温度が各部におい
て(特に端部までも)ほぼ均一となる。ここで、
ヒーターのパイプは転写体の搬送方向に対してほ
ぼ直交して直線状に延びているので、前述のよう
にヒーターの温度が各部において均一となると、
転写体に対する加熱も均一となる。しかも、前述
したパイプ端部の折り返しによりパイプ内の発熱
体も折り返されて端部で重なり合うため、ヒータ
ー端部からの発熱量が中央部に比較して増大し、
この結果、周囲の機器からの吸熱分を補給して転
写体に対する加熱をより均一化することができ、
定着不良が効果的に防止される。Function In this design, the end of the pipe is folded back so that it is almost parallel to the center, so the metal terminal that does not generate heat even when energized is placed closer to the center of the heater, while the heating element that generates heat is placed at the end of the heater. As a result, the temperature of the heater becomes almost uniform in all parts (particularly even at the ends). here,
Since the heater pipe extends in a straight line almost perpendicular to the transfer direction of the transfer body, if the temperature of the heater becomes uniform in each part as mentioned above,
Heating of the transfer body also becomes uniform. Furthermore, due to the above-mentioned folding of the end of the pipe, the heating element inside the pipe is also folded back and overlaps at the end, so the amount of heat generated from the end of the heater increases compared to the center.
As a result, it is possible to replenish heat absorbed from surrounding equipment and make the heating of the transfer body more uniform.
Poor fixing is effectively prevented.
実施例
以下、この考案の一実施例を図面に基づいて説
明する。Embodiment Hereinafter, an embodiment of this invention will be described based on the drawings.
第1図において、1は図示していない駆動機構
によつて矢印方向に走行される定着コンベアであ
り、この定着コンベア1は感光ドラム(図示して
いない)において可視トナー像が転写された紙、
プラスチツクスシート等からなる転写体2をその
走行により搬送する。定着コンベア1の上方には
輻射プレート6が設置され、この輻射プレート6
は熱伝導率が高い材料から構成されている。7は
転写体2の幅方向に延びる、即ち転写体2の搬送
方向に対してほぼ直交して直線状に延びる複数本
のヒーターであり、これらのヒーター7は転写体
2の搬送方向に互いに等距離だけ離れている。ま
た、これらヒーター7は第2,3図に示すよう
に、輻射プレート6の下面に複数の止め金具8に
よつて密着状態で取り付けられ、この結果、輻射
プレート6はヒーター7からの熱が伝導によつて
伝えられて加熱される。前記各ヒーター7は中空
の金属パイプ11を有し、このパイプ11内には
マグネシア等からなる絶縁材12が充填されてい
る。この絶縁材12内には一定ピツチの螺旋状を
したニクロム線等からなる発熱体13がパイプ1
1のほぼ全長に亘つて埋設されている。パイプ1
1の両端部には一対の導電材料からなる金属端子
14,15がそれぞれ挿入され、各金属端子1
4,15の外端部はパイプ11から突出し、図示
していないコネクタに接続される。また、各金属
端子14,15の内端側は前記発熱体13の両端
にそれぞれ接続されている。この結果、金属端子
14,15を通じて発熱体13に通電すると、発
熱体13は発熱するが金属端子14,15は殆ど
発熱しない。また、パイプ11と金属端子14,
15の内端側との間には湿気を遮断するシリコン
等の遮断材16が充填され、口封じが行なわれて
いる。第1,2,4図に示すように、前記パイプ
11の端部、この実施例では両端部が中央部にほ
ぼ平行となるよう180度折り返されており、この
結果、パイプ11内の発熱体13もパイプ11と
共に折り返される。これにより、発熱体13の両
端部は発熱体13の中央部とともに二重に重なり
合う長さLの重なり合い部21を形成する。ま
た、金属端子14,15を囲むパイプ11に両端
はパイプ11の軸線を含む平面に対して直角に折
り曲げられ(この実施例では上方に向かつて折り
曲げられ)、輻射プレート6に形成された長孔2
2を貫通して輻射プレート6の上方に突出してい
る。この結果、充電部である金属端子14,15
は輻射プレート6によつて作業領域から遮蔽され
て安全性が向上するとともに、金属端子14,1
5に接続されるコネクタ、リード線等がヒーター
7から熱遮蔽される。 In FIG. 1, reference numeral 1 denotes a fixing conveyor that is run in the direction of the arrow by a drive mechanism (not shown).
A transfer body 2 made of a plastic sheet or the like is conveyed by its running. A radiation plate 6 is installed above the fixing conveyor 1.
is made of a material with high thermal conductivity. Reference numeral 7 denotes a plurality of heaters extending in the width direction of the transfer body 2, that is, extending in a straight line almost perpendicular to the conveyance direction of the transfer body 2. They are separated by a distance. Further, as shown in FIGS. 2 and 3, these heaters 7 are attached to the lower surface of the radiant plate 6 in close contact with a plurality of fasteners 8, and as a result, the radiant plate 6 conducts heat from the heaters 7. heat is transmitted by the Each of the heaters 7 has a hollow metal pipe 11, and the pipe 11 is filled with an insulating material 12 made of magnesia or the like. Inside this insulating material 12, a heating element 13 made of a spiral nichrome wire or the like with a constant pitch is installed inside the pipe 1.
It is buried over almost the entire length of 1. pipe 1
A pair of metal terminals 14 and 15 made of a conductive material are inserted into both ends of each metal terminal 1.
The outer ends of the pipes 4 and 15 protrude from the pipe 11 and are connected to a connector (not shown). Further, the inner ends of each of the metal terminals 14 and 15 are connected to both ends of the heating element 13, respectively. As a result, when electricity is applied to the heating element 13 through the metal terminals 14 and 15, the heating element 13 generates heat, but the metal terminals 14 and 15 hardly generate any heat. In addition, the pipe 11 and the metal terminal 14,
A barrier material 16 such as silicone that blocks moisture is filled between the inner end of the cap 15 and the inner end of the cap 15 to seal the opening. As shown in FIGS. 1, 2, and 4, the ends of the pipe 11, in this embodiment both ends, are folded back 180 degrees so that they are almost parallel to the center. As a result, the heating element inside the pipe 11 13 is also folded back together with the pipe 11. Thereby, both ends of the heat generating element 13 and the center part of the heat generating element 13 form an overlapping part 21 having a length L in which they overlap in a double manner. Further, both ends of the pipe 11 surrounding the metal terminals 14 and 15 are bent at right angles to a plane including the axis of the pipe 11 (in this embodiment, bent upward), and elongated holes are formed in the radiation plate 6. 2
2 and protrudes above the radiation plate 6. As a result, the metal terminals 14 and 15 which are live parts
are shielded from the working area by the radiation plate 6 to improve safety, and the metal terminals 14, 1
Connectors, lead wires, etc. connected to the heater 7 are thermally shielded from the heater 7.
次に、この考案の一実施例の作用について説明
する。 Next, the operation of one embodiment of this invention will be explained.
今、電子写真複写機が作動し、転写体2の表面
に感光ドラムから可視トナー像が転写によつて付
着されたとする。このような転写体2は、次に、
定着コンベア1によつて矢印方向に搬送される
が、この搬送の最中に転写体2はヒーター7、輻
射プレート6からの熱を受けて加熱され可視トナ
ー像が定着される。ここで、前記金属端子14,
15は抵抗値が極めて小さいため、通電時にあつ
ても発熱しないが、このような金属端子14,1
5は前記折り返しによつてヒーター7の中央部寄
りに、一方、発熱を行なう発熱体13がヒーター
7の両端まで位置するようになり、ヒーター7の
温度が各部において(端部までも)ほぼ均一とな
る。ここで、ヒーター7のパイプ11は転写体2
の搬送方向に対してほぼ直交して直線状に延びて
いるため、転写体2に対する加熱が均一となる。
しかも、前述したようにヒーター7の両端部にお
てい発熱体13が重なり合つているため、ヒータ
ー7の両端部からの発熱量が増大する。これによ
り、周囲の機器からの吸熱分が補充され、転写体
2に対する加熱が均一化して定着不良が防止され
る。さらに、このとき、発熱体13は全体的に同
一ピツチで充分であるため、ヒーター7が長寿命
となり製作費も安価となる。 Now, assume that the electrophotographic copying machine is in operation and a visible toner image is attached to the surface of the transfer member 2 by transfer from the photosensitive drum. Such a transfer body 2 is then
The transfer body 2 is conveyed in the direction of the arrow by the fixing conveyor 1, and during this conveyance, the transfer body 2 is heated by heat from the heater 7 and the radiation plate 6, and the visible toner image is fixed thereon. Here, the metal terminal 14,
15 has an extremely low resistance value, so it does not generate heat even when energized, but such metal terminals 14, 1
5 is placed closer to the center of the heater 7 due to the folding, while the heating element 13 that generates heat is positioned up to both ends of the heater 7, so that the temperature of the heater 7 is almost uniform in each part (even at the ends). becomes. Here, the pipe 11 of the heater 7 is connected to the transfer body 2.
Since the transfer member 2 extends linearly substantially orthogonally to the conveyance direction, the transfer member 2 is heated uniformly.
Furthermore, as described above, since the heating elements 13 overlap each other at both ends of the heater 7, the amount of heat generated from both ends of the heater 7 increases. This replenishes the amount of heat absorbed from surrounding devices, uniformizes the heating of the transfer body 2, and prevents defective fixing. Furthermore, in this case, since it is sufficient that the heating elements 13 have the same pitch throughout, the heater 7 has a long life and the manufacturing cost is reduced.
なお、前述の実施例においては、パイプ11の
両端部を折り返すようにしたが、この考案におい
ては、パイプ11の一端部または他端部のみを折
り返すようにしてもよい。また、前述の実施例に
おいては、パイプ11の両端部を一度折り返し二
重の重なり合い部21を形成したが、この考案に
おいては二度以上折り返し三重以上の重なり合い
部を形成してもよい。また、前述の実施例におい
ては、ヒーター7を輻射プレート6に密着状態で
取り付けた場合について説明したが、この考案に
おいては、断面略U字形の反射笠内に設置し、ヒ
ーターからの輻射熱を該反射笠によつて反射分散
させて転写体を加熱するようにしてもよい。 In the above embodiment, both ends of the pipe 11 are folded back, but in this invention, only one end or the other end of the pipe 11 may be folded back. Further, in the above-mentioned embodiment, both ends of the pipe 11 are folded back once to form the double overlapping part 21, but in this invention, the pipe 11 may be folded back twice or more to form a triple or more overlapping part. Furthermore, in the above-mentioned embodiment, the case was explained in which the heater 7 was attached to the radiation plate 6 in close contact with the radiation plate 6, but in this invention, the heater 7 is installed inside a reflective shade with a substantially U-shaped cross section, and the radiant heat from the heater is transmitted to the radiation plate 6. The transfer body may be heated by reflection and dispersion using a reflective shade.
考案の効果
以上説明したように、この考案によれば、ヒー
ター端部における発熱量が増大するため、転写体
に対する加熱が均一化され、定着不良が防止でき
る。さらに、発熱体は全体的に同一ピツチで充分
であるため、ヒーターの寿命が長くなり、製作費
も安価となる。Effects of the Invention As explained above, according to this invention, the amount of heat generated at the end of the heater increases, so that heating of the transfer member is made uniform, and fixing defects can be prevented. Furthermore, since the heating elements need only be of the same pitch throughout, the life of the heater is extended and manufacturing costs are reduced.
第1図はこの考案の一実施例を示す電子写真複
写機の定着構造の一部破断斜視図、第2図は第1
図のI−I矢視断面図、第3図は第2図の−
矢視断面図、第4図は第2図の−矢視断面図
である。
2……転写体、11……パイプ、12……絶縁
材、13……発熱体、14,15……金属端子、
21……重なり合い部。
FIG. 1 is a partially cutaway perspective view of the fixing structure of an electrophotographic copying machine showing one embodiment of this invention, and FIG.
A sectional view taken along the line I-I in the figure, and Figure 3 is a - of Figure 2.
FIG. 4 is a sectional view taken along the - arrow in FIG. 2. 2... Transfer body, 11... Pipe, 12... Insulating material, 13... Heating element, 14, 15... Metal terminal,
21...Overlapping part.
Claims (1)
に延び両端が開口したパイプと、パイプ内に充填
された絶縁材と、絶縁材に埋設された発熱体と、
パイプの両端部にそれぞれ挿入され、内端側が発
熱体の端部に接続されるとともに外端部がパイプ
から突出した一対の金属端子と、を備え、金属端
子を通じて発熱体に通電することにより、転写体
の表面に付着した可視トナー像を加熱定着させる
電子写真複写機の定着用ヒーターにおいて、パイ
プの端部を中央部にほぼ平行となるよう折り返し
て発熱体の重なり合い部をヒーター端部を形成
し、これによつてヒーター端部における発熱量を
増大させるようにしたことを特徴とする複写機の
定着用ヒーター。 A pipe that extends linearly substantially perpendicularly to the transfer direction of the transfer body and is open at both ends, an insulating material filled in the pipe, and a heating element embedded in the insulating material.
A pair of metal terminals are inserted into both ends of the pipe, the inner end is connected to the end of the heating element, and the outer end protrudes from the pipe, and by supplying electricity to the heating element through the metal terminal, In the fixing heater of an electrophotographic copying machine that heats and fixes the visible toner image attached to the surface of the transfer body, the end of the pipe is folded back so that it is almost parallel to the center, and the overlapping part of the heating element forms the end of the heater. A fixing heater for a copying machine, characterized in that the amount of heat generated at the end of the heater is increased by this.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1987158498U JPH0531838Y2 (en) | 1987-10-16 | 1987-10-16 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1987158498U JPH0531838Y2 (en) | 1987-10-16 | 1987-10-16 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0163092U JPH0163092U (en) | 1989-04-24 |
JPH0531838Y2 true JPH0531838Y2 (en) | 1993-08-16 |
Family
ID=31438881
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1987158498U Expired - Lifetime JPH0531838Y2 (en) | 1987-10-16 | 1987-10-16 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0531838Y2 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5034769A (en) * | 1973-08-01 | 1975-04-03 | ||
JPS60140694A (en) * | 1983-12-28 | 1985-07-25 | 松下電器産業株式会社 | Spiral sheathed heater for electric oven |
-
1987
- 1987-10-16 JP JP1987158498U patent/JPH0531838Y2/ja not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5034769A (en) * | 1973-08-01 | 1975-04-03 | ||
JPS60140694A (en) * | 1983-12-28 | 1985-07-25 | 松下電器産業株式会社 | Spiral sheathed heater for electric oven |
Also Published As
Publication number | Publication date |
---|---|
JPH0163092U (en) | 1989-04-24 |
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