JPH07144786A - Paper carrying device - Google Patents

Paper carrying device

Info

Publication number
JPH07144786A
JPH07144786A JP5292325A JP29232593A JPH07144786A JP H07144786 A JPH07144786 A JP H07144786A JP 5292325 A JP5292325 A JP 5292325A JP 29232593 A JP29232593 A JP 29232593A JP H07144786 A JPH07144786 A JP H07144786A
Authority
JP
Japan
Prior art keywords
roller
rigid
elastic
elastic body
sheet conveying
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.)
Withdrawn
Application number
JP5292325A
Other languages
Japanese (ja)
Inventor
Kazuya Yuki
和也 結城
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.)
Niigata Fuji Xerox Manufacturing Co Ltd
Original Assignee
Niigata Fuji Xerox Manufacturing Co Ltd
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 Niigata Fuji Xerox Manufacturing Co Ltd filed Critical Niigata Fuji Xerox Manufacturing Co Ltd
Priority to JP5292325A priority Critical patent/JPH07144786A/en
Publication of JPH07144786A publication Critical patent/JPH07144786A/en
Withdrawn legal-status Critical Current

Links

Landscapes

  • Paper Feeding For Electrophotography (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)

Abstract

PURPOSE:To prevent the adhesion of a roller mark on a printing medium by forming one side roller of a roller pair of an elastic body into a drum shape, and the other side roller of a rigid body into a cylindrical shape. CONSTITUTION:A rigid body roller 11 has a cylindrical shape, but an elastic body roller 12, wherein the diameter of the middle part is larger than that of an end part and a whole body has a smooth curve outer shape, is formed into a so-called drum type outer shape. The lengths of the rigid body roller 11 and the elastic body roller 12 are nearly equal to each other. In this fixing device, a printing medium 10, fixed by passing through between a heated roller 2 to be heated by a heating element 1 and a pressing roller 3, is carried in an arrow C direction by the rigid body roller 11 and the elastic body roller 12, bus since the outer shape of the elastic body roller 12 is a drum type, the pressing mark of the rigid body roller 11 can be prevented from being applied to the printing medium 10.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は画像形成装置の用紙搬送
装置に関し、特に、所定の圧力で押し付け合いながら印
字媒体を挟持して搬送する複数対のローラ対を有する用
紙搬送装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying apparatus for an image forming apparatus, and more particularly to a sheet conveying apparatus having a plurality of roller pairs for nipping and conveying a print medium while pressing them against each other at a predetermined pressure.

【0002】[0002]

【従来の技術】図5は従来の用紙搬送装置の一例のロー
ラ対を示す斜視図である。
2. Description of the Related Art FIG. 5 is a perspective view showing a pair of rollers as an example of a conventional sheet conveying apparatus.

【0003】画像形成装置の従来の用紙搬送装置は、図
5に示すように、対向して設けてある剛体ローラ41と
弾性体ローラ42とを1対とする複数対のローラ対を有
し、各ローラ対は、所定の圧力で押し付け合いながら印
字媒体を挟持して搬送している。特にサイズの大きい印
字媒体に対して記録できる画像形成装置は、4対程度の
ローラ対を有している。
As shown in FIG. 5, a conventional sheet conveying device of an image forming apparatus has a plurality of roller pairs each including a rigid roller 41 and an elastic roller 42, which are provided so as to face each other. Each roller pair presses each other with a predetermined pressure, and nips and conveys the print medium. An image forming apparatus capable of recording on a print medium having a particularly large size has about four roller pairs.

【0004】剛体ローラ41および弾性体ローラ42
は、共に円筒型の形状に形成されており、平行に配設さ
れて所定の圧力で押し付け合うように圧力を与えられて
いる。
Rigid roller 41 and elastic roller 42
Are both formed in a cylindrical shape, are arranged in parallel, and are applied with pressure so as to press each other with a predetermined pressure.

【0005】[0005]

【発明が解決しようとする課題】上述したような従来の
用紙搬送装置は、剛体ローラ41と弾性体ローラ42と
の間に印字媒体を挟持して搬送するとき、弾性体ローラ
42の剛体ローラ41と接触する部分が凹むため、この
凹みによって印字媒体にローラ痕が付くという欠点を有
している。このローラ痕は、ローラ対の接触圧力を小さ
くしても解消することは不可能である。
In the conventional sheet conveying apparatus as described above, when the print medium is sandwiched and conveyed between the rigid roller 41 and the elastic roller 42, the rigid roller 41 of the elastic roller 42 is used. Since the portion that comes into contact with is dented, there is a drawback that the dent causes roller marks on the print medium. This roller mark cannot be eliminated even if the contact pressure of the roller pair is reduced.

【0006】[0006]

【課題を解決するための手段】本発明の用紙搬送装置
は、所定の圧力で押し付け合いながら印字媒体を挟持し
て搬送する複数対のローラ対を有する画像形成装置の用
紙搬送装置において、前記ローラ対の一方のローラを弾
性体で形成して太鼓型の形状とし、他方のローラを剛体
で形成して円筒型の形状としたものである。
The sheet conveying device of the present invention is a sheet conveying device of an image forming apparatus having a plurality of pairs of rollers for nipping and conveying a print medium while pressing them against each other at a predetermined pressure. One roller of the pair is made of an elastic body to have a drum shape, and the other roller is made of a rigid body to have a cylindrical shape.

【0007】[0007]

【実施例】次に、本発明の実施例について図面を参照し
て説明する。
Embodiments of the present invention will now be described with reference to the drawings.

【0008】図2は本発明の第一の実施例を用いた画像
形成装置の定着装置を示す正面図、図1は図2の実施例
のローラ対を示す斜視図である。
FIG. 2 is a front view showing a fixing device of an image forming apparatus using the first embodiment of the present invention, and FIG. 1 is a perspective view showing a roller pair of the embodiment of FIG.

【0009】図2において、加熱ローラ2は、軸受(図
示省略)を介してフレーム(図示省略)に固定されてお
り、加熱ローラ2の中心部には、発熱体1が設けられて
いる。加熱ローラ2に対向して加圧ローラ3が設けられ
ている。加圧ローラ3は、加圧ローラアーム4の先端に
支持されており、加圧ローラアーム4の他端は、スプリ
ング座6との間に加圧スプリング5を装着している。従
って加圧ローラ3は、加圧ローラアーム4を介して加圧
スプリング5の力によって加熱ローラ2に押圧されてい
る。
In FIG. 2, the heating roller 2 is fixed to a frame (not shown) via a bearing (not shown), and a heating element 1 is provided at the center of the heating roller 2. A pressure roller 3 is provided so as to face the heating roller 2. The pressure roller 3 is supported by the tip of a pressure roller arm 4, and a pressure spring 5 is attached between the other end of the pressure roller arm 4 and a spring seat 6. Therefore, the pressure roller 3 is pressed against the heating roller 2 by the force of the pressure spring 5 via the pressure roller arm 4.

【0010】加熱ローラ2および加圧ローラ3の印字媒
体10の搬送方向(矢印C)には、対をなす剛体ローラ
11および弾性体ローラ12が設けられており、剛体ロ
ーラ11は、アーム9の先端に支持されている。アーム
9の後端には、スプリング8の一端が取付けられてお
り、スプリング8の他端は、カバー7に取付けられてい
る。従って剛体ローラ11は、アーム9を介してスプリ
ング8の力によって弾性体ローラ12に押圧されてい
る。
A pair of a rigid roller 11 and an elastic roller 12 are provided in the heating roller 2 and the pressure roller 3 in the conveying direction (arrow C) of the print medium 10, and the rigid roller 11 of the arm 9 is provided. It is supported at the tip. One end of the spring 8 is attached to the rear end of the arm 9, and the other end of the spring 8 is attached to the cover 7. Therefore, the rigid roller 11 is pressed against the elastic roller 12 by the force of the spring 8 via the arm 9.

【0011】図1に示すように、剛体ローラ11は円筒
型の形状を有しているが、弾性体ローラ12は、中央部
の直径が端部の直径が大きく、全体が滑かな曲線の外形
となっており、いわゆる太鼓型の外形を有している。剛
体ローラ11と弾性体ローラ12の長さは、ほぼ等しく
なっている。
As shown in FIG. 1, the rigid roller 11 has a cylindrical shape, but the elastic roller 12 has a large diameter at the central portion and a large diameter at the end portion, and the entire outer shape is a smooth curve. And has a so-called drum-shaped outer shape. The lengths of the rigid roller 11 and the elastic roller 12 are substantially equal.

【0012】上述のように構成した定着装置において、
発熱体1によって加熱された加熱ローラ2および加圧ロ
ーラ3の間を通過して定着された印字媒体10は、剛体
ローラ11および弾性体ローラ12によって矢印C方向
に搬送されるが、このとき印字媒体10は、弾性体ロー
ラ12の外形が太鼓型となっているため、印字媒体10
には剛体ローラ11の圧痕が付かない。
In the fixing device constructed as described above,
The print medium 10 fixed by passing between the heating roller 2 and the pressure roller 3 heated by the heating element 1 is conveyed by the rigid roller 11 and the elastic roller 12 in the direction of arrow C. Since the outer shape of the elastic roller 12 of the medium 10 is drum-shaped, the print medium 10
There is no indentation of the rigid roller 11.

【0013】図3は本発明の第二の実施例のローラ対を
示す斜視図である。
FIG. 3 is a perspective view showing a roller pair according to a second embodiment of the present invention.

【0014】本実施例は、弾性体ローラ22の長さを剛
体ローラ21の長さよりも短くしたものである。本実施
例の作用および効果は、図1の実施例と同じである。
In this embodiment, the length of the elastic roller 22 is shorter than that of the rigid roller 21. The operation and effect of this embodiment are the same as those of the embodiment of FIG.

【0015】図4は本発明の第三の実施例のローラ対を
示す斜視図である。
FIG. 4 is a perspective view showing a roller pair according to a third embodiment of the present invention.

【0016】本実施例は、弾性体ローラ32の長さを剛
体ローラ31の長さよりも長くしたものである。本実施
例の作用および効果は、図1の実施例と同じである。
In this embodiment, the elastic roller 32 is made longer than the rigid roller 31. The operation and effect of this embodiment are the same as those of the embodiment of FIG.

【0017】[0017]

【発明の効果】以上説明したように、本発明の用紙搬送
装置は、弾性体ローラの外形を太鼓型のすることによ
り、印字媒体にローラ痕が付くのを防止できるという効
果がある。
As described above, the paper transporting device of the present invention has the effect of preventing roller marks on the print medium by making the outer shape of the elastic roller drum-shaped.

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

【図1】図2の実施例のローラ対を示す斜視図である。FIG. 1 is a perspective view showing a roller pair of the embodiment of FIG.

【図2】本発明の第一の実施例を用いた画像形成装置の
定着装置を示す正面図である。
FIG. 2 is a front view showing a fixing device of the image forming apparatus using the first embodiment of the present invention.

【図3】本発明の第二の実施例のローラ対を示す斜視図
である。
FIG. 3 is a perspective view showing a roller pair according to a second embodiment of the present invention.

【図4】本発明の第三の実施例のローラ対を示す斜視図
である。
FIG. 4 is a perspective view showing a roller pair according to a third embodiment of the present invention.

【図5】従来の用紙搬送装置の一例のローラ対を示す斜
視図である。
FIG. 5 is a perspective view showing a pair of rollers of an example of a conventional sheet conveying device.

【符号の説明】[Explanation of symbols]

1 発熱体 2 加熱ローラ 3 加圧ローラ 4 加圧ローラアーム 5 加圧スプリング 6 スプリング座 7 カバー 8 スプリング 9 アーム 10 印字媒体 11・21・31・41 剛体ローラ 12・22・32・42 弾性体ローラ 1 Heating Element 2 Heating Roller 3 Pressure Roller 4 Pressure Roller Arm 5 Pressure Spring 6 Spring Seat 7 Cover 8 Spring 9 Arm 10 Print Medium 11 ・ 21 ・ 31 ・ 41 Rigid Roller 12 ・ 22 ・ 32 ・ 42 Elastic Roller

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 所定の圧力で押し付け合いながら印字媒
体を挟持して搬送する複数対のローラ対を有する画像形
成装置の用紙搬送装置において、前記ローラ対の一方の
ローラを弾性体で形成して太鼓型の形状とし、他方のロ
ーラを剛体で形成して円筒型の形状としたことを特徴と
する用紙搬送装置。
1. A sheet conveying device of an image forming apparatus having a plurality of roller pairs for nipping and conveying a print medium while pressing them against each other at a predetermined pressure, wherein one roller of the roller pair is formed of an elastic body. A sheet conveying device having a drum shape and the other roller formed of a rigid body into a cylindrical shape.
【請求項2】 弾性体のローラの長さと剛体のローラの
長さとを等しくしたことを特徴とする請求項1記載の用
紙搬送装置。
2. The sheet conveying apparatus according to claim 1, wherein the length of the elastic roller is equal to the length of the rigid roller.
【請求項3】 弾性体のローラの長さを剛体のローラの
長さよりも短くしたことを特徴とする請求項1記載の用
紙搬送装置。
3. The sheet conveying apparatus according to claim 1, wherein the length of the elastic roller is shorter than the length of the rigid roller.
【請求項4】 弾性体のローラの長さを剛体のローラの
長さよりも長くしたことを特徴とする請求項1記載の用
紙搬送装置。
4. The sheet conveying apparatus according to claim 1, wherein the length of the elastic roller is longer than the length of the rigid roller.
JP5292325A 1993-11-24 1993-11-24 Paper carrying device Withdrawn JPH07144786A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5292325A JPH07144786A (en) 1993-11-24 1993-11-24 Paper carrying device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5292325A JPH07144786A (en) 1993-11-24 1993-11-24 Paper carrying device

Publications (1)

Publication Number Publication Date
JPH07144786A true JPH07144786A (en) 1995-06-06

Family

ID=17780325

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5292325A Withdrawn JPH07144786A (en) 1993-11-24 1993-11-24 Paper carrying device

Country Status (1)

Country Link
JP (1) JPH07144786A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0953885A2 (en) * 1998-04-28 1999-11-03 Canon Kabushiki Kaisha Fixing apparatus and image forming apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0953885A2 (en) * 1998-04-28 1999-11-03 Canon Kabushiki Kaisha Fixing apparatus and image forming apparatus
EP0953885A3 (en) * 1998-04-28 2001-01-03 Canon Kabushiki Kaisha Fixing apparatus and image forming apparatus
US6330419B1 (en) 1998-04-28 2001-12-11 Canon Kabushiki Kaisha Sheet discharge rotary body for use in image forming apparatus

Similar Documents

Publication Publication Date Title
US4728967A (en) Recording apparatus having a tapered roller platen for exerting a uniform pressing force against recording elements
US5146238A (en) Line-type thermal printing apparatus for printing on a sheet having different thicknesses
JPH07144786A (en) Paper carrying device
JPH10181148A (en) Apparatus for varying head pressure of label printer
JP2001063106A (en) Printer
JPH01227178A (en) Fixing device for electrophotographic printer
JPH09123489A (en) Printer head mechanism of thermal printer
JPH0538850A (en) Recording apparatus
JPH082701A (en) Carrying mechanism for recording medium
JP3758218B2 (en) Printer paper transport mechanism
JP2505638Y2 (en) Print medium feeding mechanism in printer
JPH0273280A (en) Fixation device
JPH06255080A (en) Press roller and gripping feed roller device
JP2877469B2 (en) Recording device
JPS5812780A (en) Pressing roll for heat-sensitive head
JPH07172615A (en) Pressure roller device
JPH05548A (en) Printer
JPH07101572A (en) Feeding device and image forming device
JPH05346745A (en) Fixing device for image forming device
JPH06118835A (en) Fixing device
JPS604463B2 (en) printing device
JPH05293982A (en) Thermal recorder
JPH02204070A (en) Bail roller mechanism for printer
JPS63264384A (en) Recorder
JPS58131083A (en) Thermal-type recorder for facsimile device

Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20010130