JPH10260607A - Fixing device - Google Patents
Fixing deviceInfo
- Publication number
- JPH10260607A JPH10260607A JP6521397A JP6521397A JPH10260607A JP H10260607 A JPH10260607 A JP H10260607A JP 6521397 A JP6521397 A JP 6521397A JP 6521397 A JP6521397 A JP 6521397A JP H10260607 A JPH10260607 A JP H10260607A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- notch
- fixing
- fulcrum
- fixing device
- 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
Links
Landscapes
- Fixing For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、複写機、ファクシミ
リ、プリンタ等に用いられる定着装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device used for a copying machine, a facsimile, a printer, and the like.
【０００２】[0002]
【従来の技術】従来の複写機等の画像形成装置における
定着装置は、内部にヒータランプ等を備えた定着ローラ
１１、この定着ローラ１１に圧接する加圧ローラ１２か
ら構成されている。そして、この加圧ローラ１２は加圧
手段から伝えられる加圧力により定着ローラとの加圧状
態が維持されている。ここで、この加圧手段は一般的
に、図１及び図２に示すように、加圧レバー２０と、一
端が加圧レバーに設けられた穴と係合し、他端が定着ケ
ースに係合している弾性部材２１から構成されている。
加圧レバー２０には前記穴とは別の穴２２が設けられて
おり、この穴２２と定着ケース等から延出されたピン２
３を締結することにより支点部を形成している。また、
前記加圧レバー２０には加圧ローラ１２の軸部をはめ込
む切り欠き２４が設けられている。2. Description of the Related Art A fixing device in a conventional image forming apparatus such as a copying machine includes a fixing roller 11 having a heater lamp and the like therein, and a pressure roller 12 pressed against the fixing roller 11. The pressure roller 12 is maintained in a pressure state with the fixing roller by the pressure transmitted from the pressure means. Here, as shown in FIGS. 1 and 2, the pressure means generally engages the pressure lever 20 with one end engaged with a hole provided in the pressure lever, and the other end engaged with the fixing case. The elastic members 21 are combined.
The pressure lever 20 is provided with a hole 22 different from the above-mentioned hole. The hole 22 and the pin 2 extending from the fixing case or the like are provided.
The fulcrum is formed by fastening 3. Also,
The pressure lever 20 is provided with a notch 24 into which the shaft of the pressure roller 12 is fitted.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
定着装置の加圧手段は、支点部を形成する際に、加圧レ
バーの円形の穴２２にピン２３を差込み、その後このピ
ン２３が前記穴２２から抜けないようにＥリング等の締
結部材２５で固定していたため部品点数がかさみ、組立
作業における遅延や組立する際に広いスペースを必要と
していた。However, the pressing means of the conventional fixing device inserts a pin 23 into the circular hole 22 of the pressing lever when forming the fulcrum, and then this pin 23 is Since it is fixed with a fastening member 25 such as an E-ring so as not to come off from the mounting member 22, the number of parts is increased, so that a delay in the assembly work and a large space for assembling are required.
【０００４】[0004]
【課題を解決するための手段】本発明は上述した課題を
解決するために、未定着トナー像を担持した転写材を定
着回転体対間に通過させることにより定着を行う定着装
置において、前記定着回転体対は加圧手段によって互い
に圧接されており、前記加圧手段を構成する加圧レバー
に切り欠きを設け、固定ピンと係合させて支点部を形成
することにより達成する。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a fixing apparatus for performing fixing by passing a transfer material carrying an unfixed toner image between a pair of fixing rotating members. The rotating body pair is pressed against each other by a pressing means, and this is achieved by providing a notch in a pressing lever constituting the pressing means and engaging with a fixing pin to form a fulcrum.
【０００５】[0005]
【作用】上述したように構成した定着装置によると、加
圧レバーに設けられた切り欠きとピンにより固定部が形
成される。According to the fixing device configured as described above, the fixing portion is formed by the notch and the pin provided on the pressure lever.
【０００６】[0006]
【実施例】以下、本発明の実施例を添付図面を参照して
説明する。画像形成装置の基本構成は、図３に示すよう
に、帯電器１、感光体２、現像ユニット３、レジストロ
ーラ４、転写装置５、クリーニングユニット６、定着装
置７、光学読取部等から構成されている。画像プロセス
を説明すると、まず、帯電器１で感光体２の表面が均一
に帯電される。そして、光学読取部で読み取っ画像情報
を基に書き込み部（図示しない）より前記感光体２上の
画像部に対応する箇所以外のところに光をあて、前記感
光体２上に静電潜像を形成させる。次に、現像ユニット
３では、前記静電潜像と逆極性に帯電したトナー粉を静
電潜像に付着させ可視像化させる。そして、給紙部から
出た記録紙は、レジストローラ４によりタイミングを取
られて感光体２まで搬送される。そして、前記記録紙の
裏面に位置する転写装置５から、感光体２上のトナーの
帯電極性とは逆極性の電荷を与え、静電力によりトナー
を前記記録紙に転写させる。転写されたトナー像を担持
した前記記録紙は定着装置７まで搬送されて定着工程に
入り、定着後、排紙される。また、転写後、前記感光体
２上に残った電荷は除電器（図示しない）によりその表
面が除電され、転写されずに感光体２上に残った残留ト
ナーはクリーニングユニット６を通過する際に除去され
る。Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 3, the basic configuration of the image forming apparatus includes a charger 1, a photoreceptor 2, a developing unit 3, a registration roller 4, a transfer device 5, a cleaning unit 6, a fixing device 7, an optical reading unit, and the like. ing. Describing the image process, first, the surface of the photoconductor 2 is uniformly charged by the charger 1. Then, based on the image information read by the optical reading unit, a writing unit (not shown) irradiates light to a portion other than a portion corresponding to the image portion on the photoconductor 2 based on the image information read by the optical reading unit, thereby forming an electrostatic latent image on the photoconductor 2. Let it form. Next, in the developing unit 3, a toner powder charged in a polarity opposite to that of the electrostatic latent image is attached to the electrostatic latent image to make it visible. Then, the recording paper coming out of the paper feeding unit is conveyed to the photoconductor 2 at a timing by the registration roller 4. Then, a charge having a polarity opposite to the charge polarity of the toner on the photoconductor 2 is given from the transfer device 5 located on the back surface of the recording paper, and the toner is transferred to the recording paper by electrostatic force. The recording paper carrying the transferred toner image is conveyed to the fixing device 7 and enters a fixing step. After fixing, the recording paper is discharged. After the transfer, the surface of the charge remaining on the photoconductor 2 is neutralized by a static eliminator (not shown), and the remaining toner remaining on the photoconductor 2 without being transferred passes through the cleaning unit 6. Removed.
【０００７】次に本図を基に定着工程を詳述する。転写
装置５によって転写されたトナーを担持する記録紙は転
写装置５の搬送力で搬送されて、定着装置７まで搬送さ
れる。定着装置７には入り口ガイド板１０が設けられて
おり、確実に定着装置内部に案内するように構成されて
いる。前記定着装置７内部に案内された記録紙は定着ロ
ーラ対間、即ち定着ローラ１１と、周囲を弾性層にて形
成される加圧ローラ１２とのニップ部に案内される。前
記定着ローラ１１にはヒータが内蔵されており、このヒ
ータにより前記定着ローラ１１の表面は高温に維持され
ている。この熱と、加圧ローラ１２から掛けられる圧力
により未定着トナー像を担持した記録紙の定着が行われ
る。Next, the fixing step will be described in detail with reference to FIG. The recording paper carrying the toner transferred by the transfer device 5 is conveyed by the transfer force of the transfer device 5 and conveyed to the fixing device 7. The fixing device 7 is provided with an entrance guide plate 10 and is configured to reliably guide the inside of the fixing device. The recording paper guided inside the fixing device 7 is guided between the pair of fixing rollers, that is, the nip portion between the fixing roller 11 and the pressure roller 12 formed of an elastic layer around the fixing roller 11. The fixing roller 11 has a built-in heater, and the surface of the fixing roller 11 is maintained at a high temperature by the heater. The recording paper carrying the unfixed toner image is fixed by the heat and the pressure applied from the pressure roller 12.
【０００８】次に、本発明の実施例の加圧手段について
図４、及び図５を基に説明する。加圧レバー３０の長手
方向の一端には下方向が開口した逆Ｕ字型の支点用切り
欠き３１が設けられている。また、加圧レバー３０の長
手方向の中央部近傍または前記切り欠きにやや近い方向
には作用部として、前記切り欠きとは逆方向に開口した
加圧ローラ１２の軸にはめ込まれるＵ字型の加圧ローラ
用切り欠き３２が設けられている。また、前記一端に対
する他端に設けられた穴３３には加圧バネ３４が引っか
けられておりこの加圧バネから伝達される、前記穴３３
を矢示の様に上方向に引っ張る力により次に詳述する支
点ピン３７を支点として回転し前記加圧ローラ１２を押
し上げる方向の力が加わり定着ローラ対を圧接させてい
る。次に支点ピンに関する説明を行う。支点ピン３７は
加圧レバー３０に荷重がかけられたときにも支点が移動
してしまわない様に定着ローラユニットや画像形成装置
の側板のような支持部材に固定されており、支点ピン３
７自体も加圧レバー３０の荷重に十分耐えうる用な材料
で構成されている。また、支点ピン３７の形状は加圧レ
バー３０に設けられている前記支点用切り欠き３１の円
形部の直径とほぼ同等またはそれよりも若干大きい直径
を有する円柱部３５のと前記円柱部３５の直径よりも大
きい傘部３７とで形成されている。また、前記円柱部３
５の長さ、即ち前記支持部材と前記傘部との距離ｎは前
記加圧レバー３０の厚さｍとほぼ同等もしくは若干長い
程度に維持されており、加圧レバー３０が支持部材と傘
部３７間にはめ込まれるように収まるため、スラスト方
向にがたつかないようになっている。本実施例の加圧部
を組み立てる際には、加圧レバーの支点用切り欠き３
１、加圧ローラ用切り欠き３２に対して、それぞれ支点
ピン３７、加圧ローラの軸１２をはめ込ませるだけで済
むので作業に要する時間や作業スペースを大幅に節約す
ることができる。Next, the pressing means according to the embodiment of the present invention will be described with reference to FIGS. An inverted U-shaped fulcrum notch 31 having a downward opening is provided at one longitudinal end of the pressure lever 30. Further, as a working portion in the vicinity of the central portion in the longitudinal direction of the pressing lever 30 or in a direction slightly closer to the notch, a U-shaped fitting that is fitted to the shaft of the pressing roller 12 opened in the direction opposite to the notch is used. A pressure roller notch 32 is provided. A pressure spring 34 is hooked on a hole 33 provided at the other end with respect to the one end, and the hole 33 is transmitted from the pressure spring.
As shown by the arrow, a force in the direction of pushing up the pressure roller 12 by rotating the fulcrum pin 37, which will be described in detail below, as a fulcrum by the upward pulling force is applied to press the fixing roller pair against each other. Next, the fulcrum pin will be described. The fulcrum pin 37 is fixed to a support member such as a fixing roller unit or a side plate of an image forming apparatus so that the fulcrum does not move even when a load is applied to the pressure lever 30.
7 itself is made of a material that can sufficiently withstand the load of the pressure lever 30. Further, the shape of the fulcrum pin 37 is the shape of the cylindrical portion 35 having a diameter substantially equal to or slightly larger than the diameter of the circular portion of the fulcrum notch 31 provided on the pressure lever 30 and the cylindrical portion 35. It is formed with an umbrella part 37 having a larger diameter. In addition, the cylindrical portion 3
5, that is, the distance n between the support member and the umbrella portion is maintained to be substantially equal to or slightly longer than the thickness m of the pressure lever 30. Since it fits between 37, it does not rattle in the thrust direction. When assembling the pressing portion of this embodiment, the notch 3
1. Since it is only necessary to fit the fulcrum pin 37 and the shaft 12 of the pressure roller into the pressure roller notch 32, the time and work space required for the operation can be greatly reduced.
【０００９】次に本発明の第２の実施例を図６を基に説
明する。加圧レバー４０長手方向の一端には作用部とし
て上方向に開口したＵ字型の加圧ローラ用切り欠き４２
が設けられている。また、加圧レバー４０の長手方向の
中央部近傍または前記切り欠きにやや近い方向には、前
記加圧ローラ用切り欠き４２とは逆方向に開口した逆Ｕ
字型の支点用切り欠き４１が設けられている。また、前
記一端に対する他端に設けられた穴４３には加圧バネ４
４が引っかけられておりこの加圧バネから伝達される前
記穴４３を下方向に引っ張る力により次に詳述する支点
ピン４７を支点として前記作用部に加圧ローラを押し上
げる方向の力が加わり定着ローラ対を圧接させている。
支点ピン４７に関しては第１実施例と同様のものを用い
ているため説明を省略する。Next, a second embodiment of the present invention will be described with reference to FIG. U-shaped notch 42 for U-shaped pressure roller opened upward as an action portion at one end in the longitudinal direction of pressure lever 40
Is provided. Further, in the vicinity of the central portion in the longitudinal direction of the pressure lever 40 or in a direction slightly closer to the notch, an inverted U opened in a direction opposite to the pressure roller notch 42.
A letter-shaped fulcrum notch 41 is provided. A pressure spring 4 is provided in a hole 43 provided at the other end with respect to the one end.
4 is hooked, and a force in a direction of pushing up the pressure roller is applied to the working portion by using a fulcrum pin 47, which will be described in detail below, as a fulcrum by the downward pulling force of the hole 43 transmitted from the pressure spring. The roller pair is pressed against each other.
Regarding the fulcrum pin 47, the same one as in the first embodiment is used, and the description is omitted.
【００１０】上述した、実施例では加圧レバーの前記他
端に設けられた穴に加圧バネを引っかけて加圧レバーを
上方向や下方向に引っ張る力を働かせているが、穴に対
応する箇所を直接、下方から上方にまたは上方から下方
にかかる力を作用させても良い。また、本実施例では前
記支点用切り欠き、前記加圧レバー用切り欠き、前記穴
を上述したような位置関係にて説明したが、加圧レバー
がフリーな状態つまり前記バネによる力が働いていない
状態において前記支点用切り欠きに前記支点ピンが、前
記加圧ローラ用切り欠きに加圧ローラの軸がそれぞれ少
なくとも一部分は嵌め込まれるように各切り欠きや穴の
位置を設定する事が望ましい。In the above-described embodiment, the pressure spring is hooked on the hole provided at the other end of the pressure lever to exert a force for pulling the pressure lever upward or downward. A force may be applied directly to the point from below to above or from above to below. In the present embodiment, the notch for the fulcrum, the notch for the pressure lever, and the hole are described in the above-described positional relationship. However, the pressure lever is in a free state, that is, the force by the spring is applied. It is preferable that the positions of the notches and holes be set such that the fulcrum pin is fitted into the fulcrum notch and the pressure roller shaft is at least partially fitted into the pressure roller notch in the absence of the fulcrum.
【００１１】[0011]
【発明の効果】本発明の定着装置によると、少ない部品
点数で加圧部を構成させることができまた、組立が容易
になるので組立作業における時間の短縮化と組立する際
に確保するスペースを狭くすることができる。According to the fixing device of the present invention, the pressurizing section can be formed with a small number of parts, and the assembling is facilitated, so that the time required for the assembling operation can be reduced and the space secured during assembling can be secured. Can be narrow.
【図１】従来技術の定着装置の概略図である。FIG. 1 is a schematic view of a conventional fixing device.
【図２】従来技術の加圧部を示す図である。FIG. 2 is a view showing a conventional pressure unit.
【図３】複写機の概略図である。FIG. 3 is a schematic diagram of a copying machine.
【図４】本発明の実施例を示す概略図である。FIG. 4 is a schematic diagram showing an embodiment of the present invention.
【図５】本発明の実施例の加圧部を示すである。FIG. 5 is a view showing a pressing unit according to the embodiment of the present invention.
【図６】本発明の他の実施例の加圧部を示す図である。FIG. 6 is a view showing a pressing unit according to another embodiment of the present invention.
１２ 加圧ローラ ３０、４０ 加圧レバー ３７、４７ 支点ピン 12 pressure roller 30, 40 pressure lever 37, 47 fulcrum pin
Claims (3)
転体対間に通過させることにより定着を行う定着装置に
おいて、前記定着回転体対は加圧手段によって互いに圧
接されており、前記加圧手段を構成する加圧レバーに加
圧力受け部及び切り欠きを設け、該切り欠きは固定ピン
と係合することにより支点部を形成することを特徴とす
る定着装置In a fixing device for performing fixing by passing a transfer material carrying an unfixed toner image between a pair of fixing rotators, said pair of fixing rotators are pressed against each other by pressurizing means. A fixing device wherein a pressure receiving portion and a notch are provided on a pressing lever constituting a pressure means, and the notch forms a fulcrum portion by engaging with a fixing pin.
部ににかかる荷重方向以外の方向に切り欠かれているこ
とを特徴とする請求項１に記載された定着装置2. The fixing device according to claim 1, wherein an opening direction of the notch is cut in a direction other than a load direction applied to the pressing force receiving portion.
径よりも大きく且つ切り欠きの直径よりも大きい傘部を
有することを特徴とする請求項１に記載された定着装置3. The fixing device according to claim 1, wherein an end of the fixing pin has an umbrella portion larger than a diameter of the fixing pin and larger than a diameter of the notch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6521397A JPH10260607A (en) | 1997-03-18 | 1997-03-18 | Fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6521397A JPH10260607A (en) | 1997-03-18 | 1997-03-18 | Fixing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10260607A true JPH10260607A (en) | 1998-09-29 |
Family
ID=13280420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6521397A Pending JPH10260607A (en) | 1997-03-18 | 1997-03-18 | Fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10260607A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4724290B2 (en) * | 2000-10-31 | 2011-07-13 | キヤノン株式会社 | Fixing device |
| US20130004192A1 (en) * | 2011-06-30 | 2013-01-03 | Ricoh Company, Ltd. | Fixing device with mechanism capable of detecting pressure exerted between opposed components and image forming apparatus incorporating same |
-
1997
- 1997-03-18 JP JP6521397A patent/JPH10260607A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4724290B2 (en) * | 2000-10-31 | 2011-07-13 | キヤノン株式会社 | Fixing device |
| US20130004192A1 (en) * | 2011-06-30 | 2013-01-03 | Ricoh Company, Ltd. | Fixing device with mechanism capable of detecting pressure exerted between opposed components and image forming apparatus incorporating same |
| US8948639B2 (en) * | 2011-06-30 | 2015-02-03 | Ricoh Company, Ltd. | Fixing device with mechanism capable of detecting pressure exerted between opposed components and image forming apparatus incorporating same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Effective date: 20040511 Free format text: JAPANESE INTERMEDIATE CODE: A02 |