JP2000200012A - Detector for rotary body - Google Patents

Detector for rotary body

Info

Publication number
JP2000200012A
JP2000200012A JP11001764A JP176499A JP2000200012A JP 2000200012 A JP2000200012 A JP 2000200012A JP 11001764 A JP11001764 A JP 11001764A JP 176499 A JP176499 A JP 176499A JP 2000200012 A JP2000200012 A JP 2000200012A
Authority
JP
Japan
Prior art keywords
lead wire
thermistor
holding member
length
rotating body
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.)
Pending
Application number
JP11001764A
Other languages
Japanese (ja)
Inventor
Chikatsu Nagatsuka
千勝 長塚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP11001764A priority Critical patent/JP2000200012A/en
Publication of JP2000200012A publication Critical patent/JP2000200012A/en
Pending legal-status Critical Current

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  • Measuring Temperature Or Quantity Of Heat (AREA)
  • Fixing For Electrophotography (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent damage caused by external force occurring when the U-turn length of a lead wire is long and to relax stress concentration occurring on the base part of a U-turn part caused by the repeating movement of the rotating/stopping of the rotary body of a fixing roller, etc. SOLUTION: This thermistor (detector) 10 is constituted of a thermistor element (detecting element) 1, a holding member 2 holding the element 1, a leaf spring (elastic member) 5 having a function guiding the lead wire 3 of the element 1 and a function pressing the element 1 and the member 2 against a rotating part to be measured, and a film 4 for protecting the thermistor 1 and the wire 3. In this case, length L1 for a part guiding the wire 3 of the leaf spring 5 and length L2 for a part holding the member 2 and pressing the member 2 against the part to be measured can be changed (L1<L2). Thus, the stress concentration occurring on the wire 3 by the vibration added from the part to be measured can be prevented, so that such trouble as the breaking of the wire 3 can be eliminated.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、回転体の表面状態
を検知するための検知装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detecting device for detecting a surface condition of a rotating body.

【0002】[0002]

【従来の技術】この種の回転体の表面状態を検知する検
知装置は、例えば電子写真画像形成装置等では熱加圧方
式を採用する定着装置における温度検知手段として使用
されている。
2. Description of the Related Art This type of detecting device for detecting the surface condition of a rotating body is used as a temperature detecting means in a fixing device employing a heat press method in, for example, an electrophotographic image forming apparatus.

【0003】ここで、電子写真画像形成装置の概略構成
を図4に基づいて説明する。
Here, a schematic configuration of an electrophotographic image forming apparatus will be described with reference to FIG.

【0004】図4は電子写真画像形成装置の断面図であ
り、その本体100の上部には自動原稿送り装置30が
設けられており、セットされた原稿は原稿ガラス上に送
られて光学系によって読み取られる。そして、原稿に対
応する光像が一次帯電器12によって表面が帯電された
感光ドラム11上に露光されると、感光ドラム11上に
静電潜像が形成され、この静電潜像は現像装置13によ
って現像されてトナー像として顕画化される。
FIG. 4 is a cross-sectional view of an electrophotographic image forming apparatus. An automatic document feeder 30 is provided at an upper part of a main body 100 of the electrophotographic image forming apparatus. Read. When an optical image corresponding to the document is exposed on the photosensitive drum 11 whose surface is charged by the primary charger 12, an electrostatic latent image is formed on the photosensitive drum 11, and this electrostatic latent image is developed by a developing device. 13 and developed as a toner image.

【0005】一方、例えば給紙収納庫111からは転写
材が供給され、この転写材はレジストローラ115によ
って光学系のタイミングと合わされて感光ドラム11と
転写帯電器14の間の転写部に送られ、感光ドラム11
上に形成された前記トナー像の転写を受け、その後、分
離帯電器15の作用によって感光ドラム11から分離さ
れる。そして、感光ドラム11から分離された転写材
は、ベルト搬送装置16によって定着装置18に送られ
てトナー像の定着を受けた後、排出ローラ19によって
装置本体100外へ排出される。
On the other hand, a transfer material is supplied from, for example, a paper supply storage 111, and the transfer material is sent to a transfer portion between the photosensitive drum 11 and the transfer charger 14 in synchronization with the timing of an optical system by a registration roller 115. , Photosensitive drum 11
After receiving the transfer of the toner image formed thereon, the toner image is separated from the photosensitive drum 11 by the operation of the separation charger 15. Then, the transfer material separated from the photosensitive drum 11 is sent to the fixing device 18 by the belt conveying device 16 and is fixed to the toner image. Then, the transfer material is discharged out of the apparatus main body 100 by the discharge roller 19.

【0006】尚、画像形成された転写材のもう一方の面
に画像形成するために一時的に複数枚の転写材を収納し
た後に転写材を1枚ずつ分離して送り出す再給紙装置2
0が画像形成部の下部に装着されている。
Incidentally, a re-feeding device 2 for temporarily storing a plurality of transfer materials for forming an image on the other surface of the transfer material on which an image is formed, and then separating and sending the transfer materials one by one.
0 is attached to the lower part of the image forming unit.

【0007】ところで、前記定着装置18は、内部にハ
ロゲンヒータHを有する定着ローラ9と加圧力を発生さ
せる加圧ローラ21とで構成されており、トナー像を担
持した転写材を定着ローラ9と加圧ローラ21が形成す
るニップ部を通過させることによってトナー像を転写材
上に定着する。
The fixing device 18 comprises a fixing roller 9 having a halogen heater H therein and a pressure roller 21 for generating a pressing force. The toner image is fixed on the transfer material by passing through a nip formed by the pressure roller 21.

【0008】而して、トナーの転写材上への定着性を保
証するには定着ローラ9の表面温度を一定値に制御する
ことが必要であるため、定着ローラ9の表面にはサーミ
スタと呼ばれる温度検知手段を当接させて定着ローラ9
の表面温度の変化に応じてハロゲンヒータHの点灯の制
御を行っている。
Since the surface temperature of the fixing roller 9 needs to be controlled to a constant value in order to guarantee the fixability of the toner on the transfer material, the surface of the fixing roller 9 is called a thermistor. The fixing roller 9 is brought into contact with the temperature detecting means.
The lighting control of the halogen heater H is controlled according to the change in the surface temperature.

【0009】ここで、サーミスタの詳細の構成を図5及
び図6に基づいて説明する。
Here, the detailed configuration of the thermistor will be described with reference to FIGS.

【0010】図5及び図6はサーミスタ10の一部を破
断した斜視図であり、これらの図において1は検知素子
であるサーミスタ素子1、2はサーミスタ素子1を保持
する保持部材である。尚、この保持部材2の材質として
は、定着ローラ9表面との密着性の確保から弾性を有
し、且つ、定着ローラ9の表面温度に影響されにくい耐
熱性の高い材料であるシリコンゴムが用いられている。
FIGS. 5 and 6 are perspective views in which a part of the thermistor 10 is cut away. In these figures, reference numeral 1 denotes a thermistor element 1 which is a detecting element, and 2 denotes a holding member for holding the thermistor element 1. As the material of the holding member 2, silicon rubber, which has elasticity to ensure adhesion to the surface of the fixing roller 9 and has high heat resistance which is not easily affected by the surface temperature of the fixing roller 9, is used. Have been.

【0011】又、5は保持部材2を支持する弾性部材で
あり、この弾性部材5によってサーミスタ素子1を定着
ローラ9に当接させる加圧力が安定的に発生される。4
はサーミスタ素子1と定着ローラ9表面の保護を目的と
した保護フィルムであり、この保護フィルム4には通常
ポリアミドイミド製のフィルムが用いられている。
Reference numeral 5 denotes an elastic member for supporting the holding member 2, and the elastic member 5 stably generates a pressing force for bringing the thermistor element 1 into contact with the fixing roller 9. 4
Is a protective film for the purpose of protecting the surfaces of the thermistor element 1 and the fixing roller 9. As the protective film 4, a film made of polyamideimide is usually used.

【0012】ところで、従来、サーミスタ素子1のリー
ド線3の引き出し方向には次の2つの方法が使用されて
きた。
Conventionally, the following two methods have been used in the direction in which the lead wire 3 of the thermistor element 1 is pulled out.

【0013】即ち、第1の方法は図5に示すように定着
ローラ9の回転方向に対して直角方向に引き出す方法で
あり、この場合には、リード線3を保持部材2の側面で
Uターンさせて保持部材2と弾性部材5の間に挟んだ
後、角度90°曲げて(E部)引き出している。
That is, the first method is to pull out the lead wire 3 in a direction perpendicular to the rotation direction of the fixing roller 9 as shown in FIG. Then, after being sandwiched between the holding member 2 and the elastic member 5, it is bent at an angle of 90 ° (part E) and pulled out.

【0014】又、第2の方法は図6に示すように定着ロ
ーラ9の回転方向に対してリード線3を一旦定着ローラ
9の回転方向下流側に引き出した後、Uターンさせて保
持部材2と弾性部材5の間に挟んで引き出す方法であ
る。
In the second method, as shown in FIG. 6, after the lead wire 3 is once drawn to the downstream side in the rotation direction of the fixing roller 9 with respect to the rotation direction of the fixing roller 9, the holding member 2 is turned by making a U-turn. This is a method of pulling out between the elastic member 5.

【0015】[0015]

【発明が解決しようとする課題】しかしながら、図5に
示す第1の方法ではサーミスタ素子1のリード線3を途
中で90°曲げる必要があるため、製造上リード線3を
曲げることになり、曲げ部(E)に応力集中が発生して
該リード線3が破断する可能性がある。
However, in the first method shown in FIG. 5, it is necessary to bend the lead wire 3 of the thermistor element 1 by 90 ° in the middle. There is a possibility that stress concentration occurs in the portion (E) and the lead wire 3 is broken.

【0016】又、図6に示す第2の方法ではリード線3
に製造上余分なストレスが発生しないが、定着ローラ9
の回転/停止の繰り返し運動によって保持部材2、リー
ド線3等が図7に示すように弾性変形する。図7(a)
は定着ローラ9が停止した状態、同図(b)は定着ロー
ラ9が矢印B方向に回転している状態を示している。保
持部材2が弾性変形運動を繰り返すと、リード線3のU
ターン部の付け根D部に応力集中が発生し、リード線3
が破断する可能性がある。これを防止する方法としてリ
ード線3のUターン部を長くする方法があるが、リード
線3は細いために外力に弱く、損傷し易いという問題が
発生する。
In the second method shown in FIG.
Although no extra stress is generated in the manufacturing, the fixing roller 9
The holding member 2, the lead wire 3, etc. are elastically deformed as shown in FIG. FIG. 7 (a)
FIG. 3B shows a state in which the fixing roller 9 is stopped, and FIG. 4B shows a state in which the fixing roller 9 is rotating in the direction of arrow B. When the holding member 2 repeats the elastic deformation movement, the U
Stress concentration occurs at the root D of the turn, and lead 3
May break. As a method of preventing this, there is a method of making the U-turn portion of the lead wire 3 long. However, since the lead wire 3 is thin, it is susceptible to external force and is easily damaged.

【0017】従って、本発明の第1の目的は、リード線
のUターン長を長くすることによって発生する外力によ
る破損を防止するとともに、定着ローラ等の回転体の回
転/停止の繰り返し運動によって生じるUターン部の付
け根部に発生する応力集中を緩和することができる回転
体の検知装置を提供することにある。
Accordingly, a first object of the present invention is to prevent breakage due to an external force generated by increasing the length of the U-turn of a lead wire, and to cause a repeated rotation / stop motion of a rotating body such as a fixing roller. It is an object of the present invention to provide a rotating body detection device that can reduce the concentration of stress generated at the base of a U-turn portion.

【0018】又、本発明の第2の目的は、回転体の被測
定部への検知素子の当接が確実になされる回転体の検知
装置を提供することにある。
A second object of the present invention is to provide an apparatus for detecting a rotating body in which the sensing element is reliably brought into contact with a measured portion of the rotating body.

【0019】更に、本発明の第3の目的は、リード線の
Uターン部を定着ローラ等の回転体の回転方向下流にな
るように配置することによって外乱の影響を受けにくい
回転体の検出装置を提供することにある。
A third object of the present invention is to provide an apparatus for detecting a rotating body which is hardly affected by disturbance by arranging a U-turn portion of a lead wire downstream of a rotating body such as a fixing roller in the rotating direction. Is to provide.

【0020】更に又、本発明の第4の目的は、定着ロー
ラの表面温度検知に使用可能な回転体の検出装置を提供
することにある。
Still another object of the present invention is to provide a rotating body detecting device which can be used for detecting the surface temperature of a fixing roller.

【0021】[0021]

【課題を解決するための手段】上記目的を達成するた
め、請求項1記載の発明は、検知素子と、該検知素子を
保持する保持部材と、前記検知素子のリード線をガイド
する機能と該検知素子と前記保持部材を回転する被測定
部に加圧する機能を有した弾性部材と、前記検知素子と
前記リード線の保護フィルムとで構成された回転体の検
知装置において、前記弾性部材の前記リード線をガイド
する部分の長さと前記保持部材を保持してこれを被測定
部に加圧する部分の長さを変えたことを特徴とする。
In order to achieve the above object, according to the present invention, a sensing element, a holding member for holding the sensing element, a function for guiding a lead wire of the sensing element, and a function for guiding a lead wire of the sensing element are provided. In an elastic member having a function of pressing a measuring element that rotates the detecting element and the holding member, and a rotating body detecting device including the detecting element and the protective film of the lead wire, the elastic member includes: The length of a portion for guiding a lead wire and the length of a portion for holding the holding member and pressing the holding member against a portion to be measured are changed.

【0022】請求項2記載の発明は、請求項1記載の発
明において、前記弾性部材の前記リード線をガイドする
部分の長さが保持部材を保持してこれを被測定部に加圧
する部分の長さよりも短くなるようにしたことを特徴と
する。
According to a second aspect of the present invention, in the first aspect of the present invention, the length of a portion of the elastic member for guiding the lead wire is a portion for holding the holding member and pressing the holding member against the portion to be measured. It is characterized in that it is shorter than the length.

【0023】請求項3記載の発明は、請求項1又は2記
載の発明において、前記リード線を被測定部の回転方向
下流側に引き出した後、逆方向へUターンさせて前記弾
性部材にガイドせしめることを特徴とする。
According to a third aspect of the present invention, in the first or second aspect of the present invention, after the lead wire is drawn to the downstream side in the rotational direction of the part to be measured, it is U-turned in the opposite direction to guide the elastic member. It is characterized by the following.

【0024】請求項4記載の発明は、請求項1,2又は
3記載の発明において、前記検知素子を回転体表面の温
度を検知する素子で構成し、前記保持部材と弾性部材及
び保護フィルムを耐熱性の高い材質で構成したことを特
徴とする。
According to a fourth aspect of the present invention, in the first, second or third aspect of the present invention, the detecting element is constituted by an element for detecting a temperature of the surface of the rotating body, and the holding member, the elastic member and the protective film are formed. It is characterized by being made of a material having high heat resistance.

【0025】従って、請求項1記載の発明によれば、被
測定部から加えられる振動によってリード線に発生する
応力集中を防ぎ、リード線の破断等のトラブルを解消す
ることができる。
Therefore, according to the first aspect of the present invention, it is possible to prevent stress concentration occurring in the lead wire due to the vibration applied from the portion to be measured, and to eliminate trouble such as breakage of the lead wire.

【0026】請求項2記載の発明によれば、リード線の
Uターン部の長さを長くすることによる応力集中を防ぐ
ことができるとともに、検知素子の被測定部への当接が
確実になされる。
According to the second aspect of the present invention, it is possible to prevent stress concentration caused by increasing the length of the U-turn portion of the lead wire, and to ensure that the sensing element abuts on the measured portion. You.

【0027】請求項3記載の発明によれば、回転体の被
測定部の回転運動によりリード線に発生する応力集中を
緩和することができる。
According to the third aspect of the present invention, it is possible to reduce the concentration of stress generated in the lead wire due to the rotational movement of the measured portion of the rotating body.

【0028】請求項4記載の発明によれば、当該検知装
置を画像形成装置の定着ローラ等の高温の回転体の温度
制御に供される温度検知手段とした用いることができ
る。
According to the fourth aspect of the present invention, the detecting device can be used as temperature detecting means for controlling the temperature of a high-temperature rotating body such as a fixing roller of the image forming apparatus.

【0029】[0029]

【発明の実施の形態】以下に本発明の実施の形態を添付
図面に基づいて説明する。
Embodiments of the present invention will be described below with reference to the accompanying drawings.

【0030】図1は本発明に係る検知装置であるサーミ
スタの一部を破断した斜視図、図2は同サーミスタを電
子写真画像形成装置の定着装置に実装した状態を示す定
着装置の断面図、図3は定着ローラの停止と回転の繰り
返しによってサーミスタが受ける変動動作を示す部分断
面図であり、これらの図においては図4〜図7に示した
と同一要素には同一符号を付しており、以下、それらに
ついての説明は省略する。
FIG. 1 is a perspective view in which a part of a thermistor as a detecting device according to the present invention is cut away, FIG. 2 is a cross-sectional view of a fixing device showing a state where the thermistor is mounted on a fixing device of an electrophotographic image forming apparatus, FIG. 3 is a partial cross-sectional view showing a fluctuating operation of the thermistor due to repetition of stop and rotation of the fixing roller. In these figures, the same elements as those shown in FIGS. 4 to 7 are denoted by the same reference numerals. Hereinafter, the description thereof will be omitted.

【0031】図1に示す本発明に係る検出装置としての
サーミスタ10において、1は定着ローラ9(図2参
照)の表面温度を検知するサーミスタ素子であり、該サ
ーミスタ素子1は定着ローラ9の表面温度を正確にモニ
ターする必要があるため、耐熱性と密着性を増すために
弾性を有したシリコンゴムから成る保持部材2に埋設さ
れている。
In the thermistor 10 shown in FIG. 1 as a detecting device according to the present invention, reference numeral 1 denotes a thermistor element for detecting the surface temperature of the fixing roller 9 (see FIG. 2). Since it is necessary to accurately monitor the temperature, it is embedded in a holding member 2 made of silicon rubber having elasticity in order to increase heat resistance and adhesion.

【0032】又、4はサーミスタ素子1と保持部材2及
びリード線3を保護する保護フィルムであり、これは耐
熱性の高いポリアミドイミドで構成されている。5は保
持部材2を板上に保持するとともに、サーミスタ素子1
を定着ローラ9に当接させるための押圧力を発生させる
ための板バネであり、サーミスタ素子1のリード線3は
一方向に引き出された後にUターンされ、保持部材2と
板バネ5の間に挟み込まれて板バネ5の方向(図1の矢
印A方向)に引き出されている。
Reference numeral 4 denotes a protective film for protecting the thermistor element 1, the holding member 2 and the lead wire 3, and is made of polyamide imide having high heat resistance. 5 holds the holding member 2 on a plate, and holds the thermistor element 1
Is a leaf spring for generating a pressing force for causing the thermistor element 1 to come into contact with the fixing roller 9. And is pulled out in the direction of the leaf spring 5 (the direction of arrow A in FIG. 1).

【0033】ところで、板バネ5にはコの字型の切欠き
部5−1がリード線3に該当する位置に形成されてい
る。そして、板バネ5の切欠き部5−1以外の部分は保
持部材2を支持してこれの定着ローラ9への当接圧を十
分に確保することができるよう構成されている。
A U-shaped notch 5-1 is formed in the leaf spring 5 at a position corresponding to the lead wire 3. The portion other than the cutout portion 5-1 of the leaf spring 5 is configured to support the holding member 2 so that a sufficient contact pressure against the fixing roller 9 can be secured.

【0034】而して、上述のように板バネ5に切欠き部
5−1を形成することによって、図3(b)に示すよう
に、該板バネ5の前記リード線3をガイドする部分の長
さL1が保持部材2を保持してこれを定着ローラ9に加
圧する部分の長さL2よりも短くなり(L1<L2)、
この結果、リード線3のUターン長Lが長くなる。
By forming the notch 5-1 in the leaf spring 5 as described above, a portion of the leaf spring 5 for guiding the lead wire 3 as shown in FIG. L1 is shorter than the length L2 of the portion that holds the holding member 2 and presses it against the fixing roller 9 (L1 <L2),
As a result, the U-turn length L of the lead wire 3 increases.

【0035】以上のように構成されたサーミスタ10を
図2に示す定着ローラ9に実装するに当たっては、定着
ローラ9の回転方向下流側(図2のB方向)にリード線
3のUターン部が位置する方向に設定することが望まし
い。
When the thermistor 10 configured as described above is mounted on the fixing roller 9 shown in FIG. It is desirable to set in the direction in which it is located.

【0036】図3(a)は定着ローラ9が停止している
ときのサーミスタ10の状態を示し、同図(b)は定着
ローラ9が回転しているときのサーミスタ10の変形状
態を示すが、定着ローラ9の回転/停止動作によって受
ける保持部材2の矢印C方向の弾性変形によってリード
線3の屈曲点Dに生じる応力集中は該リード線3のUタ
ーン長Lが長いために小さく抑えられ、リード線3の破
断等の現象が発生することがない。
FIG. 3A shows a state of the thermistor 10 when the fixing roller 9 is stopped, and FIG. 3B shows a deformed state of the thermistor 10 when the fixing roller 9 is rotating. The stress concentration at the bending point D of the lead wire 3 due to the elastic deformation of the holding member 2 in the direction of the arrow C received by the rotation / stop operation of the fixing roller 9 is suppressed to a small value because the U-turn length L of the lead wire 3 is long. Also, the phenomenon such as breakage of the lead wire 3 does not occur.

【0037】尚、本発明は検知装置の構成に関するもの
であり、他の検知素子にも応用可能であり、上記構成に
限定されないことは言うまでもない。
It should be noted that the present invention relates to the configuration of the detecting device, and can be applied to other detecting elements, and it is needless to say that the present invention is not limited to the above configuration.

【0038】[0038]

【発明の効果】以上の説明で明らかなように、請求項1
記載の発明によれば、被測定部から加えられる振動によ
ってリード線に発生する応力集中を防ぎ、リード線の破
断等のトラブルを解消することができるという効果が得
られる。
As is apparent from the above description, claim 1
According to the described invention, it is possible to prevent the concentration of stress generated in the lead wire due to the vibration applied from the part to be measured, and to eliminate the trouble such as breakage of the lead wire.

【0039】請求項2記載の発明によれば、リード線の
Uターン部の長さを長くすることによる応力集中を防ぐ
ことができるとともに、検知素子の被測定部への当接が
確実になされるという効果が得られる。
According to the second aspect of the present invention, it is possible to prevent stress concentration caused by increasing the length of the U-turn portion of the lead wire, and to ensure that the sensing element abuts on the portion to be measured. The effect is obtained.

【0040】請求項3記載の発明によれば、回転体の被
測定部の回転運動によりリード線に発生する応力集中を
緩和することができるという効果が得られる。
According to the third aspect of the invention, an effect is obtained that stress concentration generated in the lead wire due to the rotational movement of the measured portion of the rotating body can be reduced.

【0041】請求項4記載の発明によれば、当該検知装
置を画像形成装置の定着ローラ等の高温の回転体の温度
制御に用いることができるという効果が得られる。
According to the fourth aspect of the present invention, an effect is obtained that the detecting device can be used for controlling the temperature of a high-temperature rotating body such as a fixing roller of an image forming apparatus.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明に係る検知装置であるサーミスタの一部
を破断した斜視図である。
FIG. 1 is a partially broken perspective view of a thermistor as a detection device according to the present invention.

【図2】本発明に係る検知装置であるサーミスタを電子
写真画像形成装置の定着装置に実装した状態を示す定着
装置の部分断面図である。
FIG. 2 is a partial cross-sectional view of the fixing device showing a state where a thermistor as a detection device according to the present invention is mounted on the fixing device of the electrophotographic image forming apparatus.

【図3】定着ローラの停止と回転の繰り返しによってサ
ーミスタが受ける変動動作を示す部分断面図である。
FIG. 3 is a partial cross-sectional view showing a fluctuating operation which is applied to a thermistor by stopping and rotating a fixing roller repeatedly.

【図4】電子写真画像形成装置の断面図である。FIG. 4 is a cross-sectional view of the electrophotographic image forming apparatus.

【図5】従来の検知装置であるサーミスタの一部を破断
した斜視図である。
FIG. 5 is a partially cutaway perspective view of a thermistor as a conventional detection device.

【図6】従来の検知装置であるサーミスタの一部を破断
した斜視図である。
FIG. 6 is a perspective view in which a part of a thermistor as a conventional detection device is cut away.

【図7】従来の検知装置であるサーミスタにおいて定着
ローラの停止と回転の繰り返しによってサーミスタが受
ける変動動作を示す部分断面図である。
FIG. 7 is a partial cross-sectional view showing a fluctuating operation of a thermistor, which is a conventional detection device, which is applied to the thermistor by repeating stop and rotation of a fixing roller.

【符号の説明】[Explanation of symbols]

1 サーミスタ素子(検知素子) 2 保持部材 3 リード線 4 保護フィルム 5 板バネ(弾性部材) 9 定着ローラ(回転体) 10 サーミスタ(検知装置) L1 弾性部材のリード線をガイドする部分の長さ L2 弾性部材の保持部材を保持してこれを被測定
部加圧する部分の長さ
REFERENCE SIGNS LIST 1 thermistor element (detection element) 2 holding member 3 lead wire 4 protective film 5 leaf spring (elastic member) 9 fixing roller (rotating body) 10 thermistor (detection device) Length of the part where the holding member of the elastic member is held and the part to be measured is pressed against it

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 検知素子と、該検知素子を保持する保持
部材と、前記検知素子のリード線をガイドする機能と該
検知素子と前記保持部材を回転する被測定部に加圧する
機能を有した弾性部材と、前記検知素子と前記リード線
の保護フィルムとで構成された回転体の検知装置におい
て、 前記弾性部材の前記リード線をガイドする部分の長さと
前記保持部材を保持してこれを被測定部に加圧する部分
の長さを変えたことを特徴とする回転体の検知装置。
1. A detecting element, a holding member for holding the detecting element, a function of guiding a lead wire of the detecting element, and a function of pressing the detecting element and the portion to be measured which rotate the holding member. In a rotating body detection device comprising an elastic member, the detecting element and a protective film for the lead wire, a length of a portion of the elastic member for guiding the lead wire and the holding member are held and covered. A detecting device for a rotating body, wherein a length of a portion to be pressurized to a measuring unit is changed.
【請求項2】 前記弾性部材の前記リード線をガイドす
る部分の長さが保持部材を保持してこれを被測定部に加
圧する部分の長さよりも短くなるようにしたことを特徴
とする請求項1記載の回転体の検知装置。
2. A length of a portion of the elastic member for guiding the lead wire is shorter than a length of a portion for holding a holding member and pressing the holding member against a portion to be measured. Item 4. The rotating body detection device according to Item 1.
【請求項3】 前記リード線を被測定部の回転方向下流
側に引き出した後、逆方向へUターンさせて前記弾性部
材にガイドせしめることを特徴とする請求項1又は2記
載の回転体の検知装置。
3. The rotating body according to claim 1, wherein after the lead wire is drawn to the downstream side in the rotational direction of the measured portion, the lead wire is U-turned in the opposite direction and guided by the elastic member. Detection device.
【請求項4】 前記検知素子を回転体表面の温度を検知
する素子で構成し、前記保持部材と弾性部材及び保護フ
ィルムを耐熱性の高い材質で構成したことを特徴とする
請求項1,2又は3記載の回転体の検知装置。
4. The device according to claim 1, wherein the detecting element is formed of an element for detecting the temperature of the surface of the rotating body, and the holding member, the elastic member and the protective film are formed of a material having high heat resistance. Or a detection device for a rotating body according to 3.
JP11001764A 1999-01-07 1999-01-07 Detector for rotary body Pending JP2000200012A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11001764A JP2000200012A (en) 1999-01-07 1999-01-07 Detector for rotary body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11001764A JP2000200012A (en) 1999-01-07 1999-01-07 Detector for rotary body

Publications (1)

Publication Number Publication Date
JP2000200012A true JP2000200012A (en) 2000-07-18

Family

ID=11510658

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11001764A Pending JP2000200012A (en) 1999-01-07 1999-01-07 Detector for rotary body

Country Status (1)

Country Link
JP (1) JP2000200012A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009163039A (en) * 2008-01-08 2009-07-23 Kyocera Mita Corp Fixing device and image forming apparatus including the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009163039A (en) * 2008-01-08 2009-07-23 Kyocera Mita Corp Fixing device and image forming apparatus including the same

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