JP2728173B2 - Paper jam detection mechanism in thermal fusing device - Google Patents
Paper jam detection mechanism in thermal fusing deviceInfo
- Publication number
- JP2728173B2 JP2728173B2 JP1110489A JP11048989A JP2728173B2 JP 2728173 B2 JP2728173 B2 JP 2728173B2 JP 1110489 A JP1110489 A JP 1110489A JP 11048989 A JP11048989 A JP 11048989A JP 2728173 B2 JP2728173 B2 JP 2728173B2
- Authority
- JP
- Japan
- Prior art keywords
- contact
- electrode
- heat roller
- recording paper
- paper jam
- 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)
- Paper Feeding For Electrophotography (AREA)
- Controlling Sheets Or Webs (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は画像形成装置に用いられる熱定着装置におけ
る紙詰まり検知機構に関する。Description: TECHNICAL FIELD The present invention relates to a paper jam detecting mechanism in a heat fixing device used in an image forming apparatus.
（従来技術） 熱定着装置での紙詰まりを検知する手段として，従来
においては記録紙搬送方向において熱定着装置の上流側
に第１スイッチ，熱定着装置の下流側に第２スイッチを
それぞれ配置し，第１スイッチが記録紙により作動され
ると同時にタイマー手段を作動させ，記録紙がタイマー
手段の設定時間内に第２スイッチを作動させたか否かを
検知するようにしたものがある。(Prior Art) Conventionally, as means for detecting a paper jam in a thermal fixing device, a first switch is disposed upstream of the thermal fixing device in the recording paper conveyance direction, and a second switch is disposed downstream of the thermal fixing device. , A timer is activated at the same time that the first switch is activated by the recording paper, and it is detected whether or not the recording paper activates the second switch within the time set by the timer.
（発明が解決しようとする問題点） 上記従来技術にあっては，熱定着装置で紙詰まりが発
生した場合，記録紙が熱ローラに巻き付かない状態で記
録紙が熱定着装置の排紙側で折れ曲がって詰まった時に
は，操作者はこの詰まった記録紙を目視確認することが
できる。(Problems to be Solved by the Invention) In the above-described conventional technology, when a paper jam occurs in the heat fixing device, the recording paper is not wound around the heat roller and the recording paper is discharged to the discharge side of the heat fixing device. When the paper is bent and jammed, the operator can visually check the jammed recording paper.
しかしながら，一般的には画像形成装置の構造上，熱
ローラは基体カバーを開放させても外部からは見えにく
い位置に設けてあるので，記録紙の熱ローラへの巻き付
き現象が発生した場合においては，操作者は記録紙の熱
ローラへの巻き付きを目視確認することが困難な場合が
多い。そして，このために操作者は機体カバーを閉じて
再び装置の動作を始めてしまい，熱ローラに巻き付いた
記録紙が焼け焦げたり発火するという事態が発生する危
険性がある。However, in general, due to the structure of the image forming apparatus, the heat roller is provided at a position where it is difficult to see from the outside even when the base cover is opened. In many cases, it is difficult for the operator to visually check the winding of the recording paper around the heat roller. For this reason, the operator closes the body cover and starts the operation of the apparatus again, and there is a risk that the recording paper wound around the heat roller may be scorched or ignited.
（発明の目的） この発明は上記の問題に鑑みてなされたものであり，
熱ローラに記録紙が巻き付いたか否かを容易にしかも即
時に検知することの出来る熱定着装置における紙詰まり
検知機構を提供することを目的とする。(Object of the Invention) The present invention has been made in view of the above problems,
It is an object of the present invention to provide a paper jam detecting mechanism in a heat fixing device capable of easily and immediately detecting whether or not a recording paper has been wound around a heat roller.
（問題点を解決するための手段） 上記の目的を達成するために，この発明の紙詰まり検
知機構は，内部に加熱手段を有する熱ローラと該熱ロー
ラに対して所定の圧力で接触される加圧ローラとから成
る熱定着装置における紙詰まり検知機構において，該熱
ローラから記録紙を剥離するための爪部材に対して該熱
ローラの回転方向における下流側に，その先端部が該熱
ローラに対して接触する案内部材を設け，該案内部材の
上面に電極を配置し，該案内部材に対向して該電極に接
触する接触子を配置し，該電極と該接触子の間に記録紙
が進入することによる該電極と該接触子の非接触状態を
検知する検知手段を設けたことを特徴とする。(Means for Solving the Problems) In order to achieve the above object, a paper jam detection mechanism according to the present invention includes a heat roller having a heating means therein and a predetermined pressure applied to the heat roller. In a paper jam detecting mechanism in a heat fixing device including a pressure roller, a tip of the heat roller is located downstream of a claw member for separating recording paper from the heat roller in a rotation direction of the heat roller. A guide member for contacting the guide member, an electrode disposed on an upper surface of the guide member, a contact opposing the guide member for contacting the electrode, and a recording paper between the electrode and the contact member. Detecting means for detecting a non-contact state between the electrode and the contact due to the entry of the sensor.
（作用） 熱定着装置で記録紙の紙詰まりが発生し，剥離爪を通
過した記録紙はその先端が熱ローラに接触する案内部材
上を通過し，更に案内部材上に設けられる電極と該電極
に対して接触する接触子との間に進入する。そして，記
録紙が電極と接触子とを非接触状態となし，電極と接触
子との間の電気的導通を遮断する。(Operation) When the recording paper is jammed in the heat fixing device and the recording paper has passed through the peeling claw, the leading end of the recording paper passes through a guide member in contact with a heat roller, and further, an electrode provided on the guide member and the electrode Between the contacts that contact the Then, the recording paper brings the electrode and the contact into a non-contact state, and interrupts the electrical conduction between the electrode and the contact.
（実施例） 第１図は本発明の紙詰まり検知機構を適用した熱定着
装置を示す図であり，第２図は第１図に示される熱定着
装置の断面図である。(Embodiment) FIG. 1 is a view showing a heat fixing device to which a paper jam detecting mechanism of the present invention is applied, and FIG. 2 is a sectional view of the heat fixing device shown in FIG.
１は熱定着装置であり，主として内部にヒータ３を有
する熱ローラ５と，熱ローラ５に対して所定の圧力で接
する加圧ローラ７とから成っている。加圧ローラ７に近
接して案内板９が配置され，また熱ローラ５に対して複
数個（実施例では５個）の爪11が，その先端を加熱ロー
ラ５に加圧接触する如く配置されている。Reference numeral 1 denotes a heat fixing device, which mainly includes a heat roller 5 having a heater 3 therein, and a pressure roller 7 which comes into contact with the heat roller 5 at a predetermined pressure. A guide plate 9 is arranged near the pressure roller 7, and a plurality of (five in this embodiment) claws 11 are arranged on the heat roller 5 so that the tips thereof come into pressure contact with the heat roller 5. ing.
熱ローラ５の回転方向に見て爪11の下流側には，先鋭
な案内部材20がその先端部が熱ローラ５に接触状態とな
る如く配置されている。そして，案内部材20の上面部に
は薄板状のリン青銅等の電極21が配置されている。ま
た，電極21に対向してリン青銅等の弾性を有する接触子
23が配置され，接触子23は電極21に対して小さな弾性力
で接触状態が保持されている。A sharp guide member 20 is disposed downstream of the claw 11 when viewed in the rotation direction of the heat roller 5 so that the tip of the guide member 20 is in contact with the heat roller 5. An electrode 21 made of a thin plate such as phosphor bronze is arranged on the upper surface of the guide member 20. In addition, a contact having elasticity such as phosphor bronze facing the electrode 21
The contact 23 is kept in contact with the electrode 21 with a small elastic force.
通常，電極21と接触子23との間に何も存在しない時に
は，電極21と接触子23とは導通状態となっている。しか
しながら，記録紙２が熱ローラ５に付着した状態で爪11
を通過して案内部材20に案内されて電極21と接触子23と
の間に達すると，電極21と接触子23とは電気的に遮断状
態となる。そして，上記の電極21と接触子23との間の導
通状態，非導通状態のいづれかの状態が検知手段30によ
り判別される。Normally, when there is nothing between the electrode 21 and the contact 23, the electrode 21 and the contact 23 are in a conductive state. However, when the recording paper 2 adheres to the heat roller 5,
Is passed through the guide member 20 and reaches between the electrode 21 and the contact 23, the electrode 21 and the contact 23 are electrically disconnected. Then, the detecting means 30 determines which of the conductive state and the non-conductive state between the electrode 21 and the contact 23 is.
従って，記録紙２が熱ローラ５に巻き付き，記録紙２
の先端部が電極21と接触子23との間に達した時，電極21
と接触子23との導通状態が電気的に遮断状態となり，こ
の変化が検知手段30により検知され，これにより記録紙
２の熱ローラ５への巻き付きが検知される。Therefore, the recording paper 2 wraps around the heat roller 5, and the recording paper 2
When the tip of the electrode reaches between the electrode 21 and the contact 23, the electrode 21
The state of conduction between the contact paper 23 and the contact 23 is electrically cut off, and this change is detected by the detecting means 30, whereby the winding of the recording paper 2 around the heat roller 5 is detected.
（発明の効果） 本発明に係る紙詰まり検知機構によれば，熱ローラに
記録紙が巻き付いた時，確実容易にしかも即時に巻き付
きを検知することができる。(Effect of the Invention) According to the paper jam detecting mechanism of the present invention, when the recording paper is wound around the heat roller, the winding can be detected easily and immediately.
第１図は本発明の紙詰まり検知機構を適用した熱定着装
置を示す図，第２図は第１図に示される熱定着装置の断
面図である。 ２……記録紙,5……熱ローラ ７……加圧ローラ,20……案内部材,21……電極,23……
接触子 30……検知手段FIG. 1 is a diagram showing a heat fixing device to which a paper jam detecting mechanism of the present invention is applied, and FIG. 2 ... Recording paper, 5 ... Heat roller 7 ... Pressurizing roller, 20 ... Guide member, 21 ... Electrode, 23 ...
Contact 30 ... Detection means
Claims (1)
ローラに対して所定の圧力で接触される加圧ローラとか
ら成る熱定着装置における紙詰まり検知機構において，
該熱ローラから記録紙を剥離するための爪部材に対して
該熱ローラの回転方向における下流側に，その先端部が
該熱ローラに対して接触する案内部材を設け，該案内部
材の上面に電極を配置し，該案内部材に対向して該電極
に接触する接触子を配置し，該電極と該接触子の間に記
録紙が進入することによる該電極と該接触子の非接触状
態を検知する検知手段を設けたことを特徴とする熱定着
装置における紙詰まり検知機構。A paper jam detecting mechanism in a heat fixing device comprising a heat roller having a heating means therein and a pressure roller contacting the heat roller at a predetermined pressure.
A guide member is provided on the downstream side in the rotation direction of the heat roller with respect to a claw member for peeling the recording paper from the heat roller, and a leading end of the guide member is in contact with the heat roller. An electrode is arranged, and a contact is provided in contact with the electrode in opposition to the guide member. The non-contact state of the electrode and the contact caused by the recording paper entering between the electrode and the contact is determined. A paper jam detecting mechanism in a thermal fixing device, comprising a detecting means for detecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1110489A JP2728173B2 (en) | 1989-04-28 | 1989-04-28 | Paper jam detection mechanism in thermal fusing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1110489A JP2728173B2 (en) | 1989-04-28 | 1989-04-28 | Paper jam detection mechanism in thermal fusing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02287581A JPH02287581A (en) | 1990-11-27 |
| JP2728173B2 true JP2728173B2 (en) | 1998-03-18 |
Family
ID=14537040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1110489A Expired - Lifetime JP2728173B2 (en) | 1989-04-28 | 1989-04-28 | Paper jam detection mechanism in thermal fusing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2728173B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07129020A (en) * | 1993-10-29 | 1995-05-19 | Brother Ind Ltd | Feeding roller controller |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6342790A (en) * | 1986-08-07 | 1988-02-23 | Nippon Yoki Kogyo Kk | Method for disinfecting city water |
-
1989
- 1989-04-28 JP JP1110489A patent/JP2728173B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02287581A (en) | 1990-11-27 |
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