JPH0198536A - Sheet feeder - Google Patents
Sheet feederInfo
- Publication number
- JPH0198536A JPH0198536A JP62256606A JP25660687A JPH0198536A JP H0198536 A JPH0198536 A JP H0198536A JP 62256606 A JP62256606 A JP 62256606A JP 25660687 A JP25660687 A JP 25660687A JP H0198536 A JPH0198536 A JP H0198536A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- separating pad
- separation pad
- roller
- friction coefficient
- 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.)
- Granted
Links
- 238000000926 separation method Methods 0.000 claims description 26
- 239000003082 abrasive agent Substances 0.000 claims description 17
- 238000005498 polishing Methods 0.000 abstract 4
- 230000006866 deterioration Effects 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
Landscapes
- Paper Feeding For Electrophotography (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は、複写機、印刷機、レーザービームプリンタ等
の画像形成装置のシート給送装置に係り、詳しくはシー
ト給送手段（以下給紙ローラという）及び分離パッドを
備えろシート給送装置に関する。Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a sheet feeding device for an image forming apparatus such as a copying machine, a printing machine, a laser beam printer, etc. The present invention relates to a sheet feeding device comprising a paper roller (referred to as a paper roller) and a separation pad.
（ロ）従来の技術
従来、給紙ローラと分離パッドとを備えたシート給送装
置が知られているが、該シート給送装置１ａは、第５図
に示すように、カセット２を備九でおり、該カセット２
は、シートＳを積載しかつ昇降自在な中板３と、該中板
３を上方に付勢するバネ５とを備えている。そして、該
カセット２に近接して、該カセット２に収納されている
シートＳを給送する給紙ローラ６が回転自在に支持され
ており、該ローラ６の軸６ａには該ローラ６よりわずか
に半径が小さいアイドルローラ７が遊転自在に支持され
ている。また、該給紙ローラ６の下流には搬送ローラ対
９が配設されており、該ローラ対９の下ローラ９ａの軸
９ｂには上ガイド板１０ａと対をなす下ガイド板１０ｂ
が回動自在に支持されている。更に、該下ガイド板１０
ｂの先端には分離パッド１１が配設されており、該分離
パッド１１はバネ１２により前記給紙ローラ６へ押圧付
勢されるように構成されている。(B) Prior Art Conventionally, a sheet feeding device equipped with a paper feeding roller and a separation pad is known, but the sheet feeding device 1a has a cassette 2 as shown in FIG. Then, the cassette 2
includes an intermediate plate 3 on which sheets S are loaded and which can be raised and lowered freely, and a spring 5 that biases the intermediate plate 3 upward. A paper feed roller 6 for feeding the sheets S stored in the cassette 2 is rotatably supported in the vicinity of the cassette 2, and a shaft 6a of the roller 6 is slightly smaller than the roller 6. An idle roller 7 having a small radius is freely rotatably supported. Further, a pair of transport rollers 9 is disposed downstream of the paper feed roller 6, and a lower guide plate 10b that is paired with an upper guide plate 10a is attached to the shaft 9b of the lower roller 9a of the roller pair 9.
is rotatably supported. Furthermore, the lower guide plate 10
A separation pad 11 is disposed at the tip of b, and the separation pad 11 is configured to be pressed against the paper feed roller 6 by a spring 12.
そして、図示しないスタートキーが押されると、一回転
制御される給紙ローラ６が回転してシートＳを分離パッ
ド１１により１枚ずつ分離して給送する（第６図参照）
。この際、給紙ローラ６の摩擦係数Ｆと、分離パッド１
１の摩擦係数Ｇと、シートＳのＴｇ！擦係数ＨとはＦ＞
Ｇ＞Ｈの関係にあるので、重送することはない。それか
ら、該シートＳは停止している搬送ローラ対９に当接し
てループを形成する。この時、該シートの後端はアイド
ルローラ７と分離パッド１１とにより挾持されている。Then, when a start key (not shown) is pressed, the paper feed roller 6, which is controlled by one revolution, rotates and the sheets S are separated and fed one by one by the separation pad 11 (see Fig. 6).
. At this time, the friction coefficient F of the paper feed roller 6 and the separation pad 1
The friction coefficient G of 1 and the Tg of the sheet S! What is friction coefficient H?
Since the relationship is G>H, double feeding will not occur. Then, the sheet S contacts the stopped conveyance roller pair 9 to form a loop. At this time, the rear end of the sheet is held between the idle roller 7 and the separation pad 11.
そして、所定時間後に搬送ローラ対９が回転を開始する
と、該シートＳは、該搬送ローラ９に挾持されて搬送さ
れる（第７図参照）。Then, after a predetermined time, when the pair of conveyance rollers 9 starts rotating, the sheet S is conveyed while being held by the conveyance rollers 9 (see FIG. 7).
←→ 発明が解決しようとする問題点
ところで、上述したシート給送装置１ａでは、シートＳ
が搬送ローラ対９に挾持されて搬送される際、該シート
Ｓの後端はアイドルローラ７と分離パッド１１とに挾持
されており、該シートＳの後端は分離パッド１１と摩擦
接触しながら搬送される。このため、分離パッド１１の
表面に紙粉等が付着しかつ表面がシートＳとの摩擦によ
り劣化するなどして該分離パッド１１表面のｇ！擦が低
下し、該パッド１１の摩擦係数Ｇがシートの摩擦係数Ｈ
と略々等しくなると、シートの電送が発生し易くなると
いう欠点があった。←→ Problems to be Solved by the Invention By the way, in the sheet feeding device 1a described above, the sheet S
When the sheet S is conveyed while being held between the pair of conveying rollers 9, the rear end of the sheet S is held between the idle roller 7 and the separation pad 11, and the rear end of the sheet S is in frictional contact with the separation pad 11. transported. For this reason, paper dust and the like adhere to the surface of the separation pad 11, and the surface deteriorates due to friction with the sheet S, causing the g of the surface of the separation pad 11 to deteriorate. The friction decreases, and the friction coefficient G of the pad 11 becomes the friction coefficient H of the sheet.
If it is approximately equal to , there is a drawback that electrical transfer of the sheet is likely to occur.
（ハ）問題を解決するための手段
本発明は、上述問題点を解消することを目的とするもの
であり、例えば第１図を参照して示すと、レート給送手
段（６）に、分離パッド（１１）の表面を研摩する研摩
材（１３）を設けた、ことを特徴とするものである。(C) Means for solving the problem The present invention aims to solve the above-mentioned problems. For example, as shown in FIG. 1, the rate feeding means (6) has a separate It is characterized in that an abrasive material (13) is provided to polish the surface of the pad (11).
（ホ） 作用
上述構成に基づき、非シート給送時にシート給送手段（
６）が回転することにより、研摩材（１３）が、分離パ
ッド（１１）に当接して該分離パッド（１１）の表面に
付着している紙粉を除去すると共に劣化層を除去する。(E) Function Based on the above configuration, the sheet feeding means (
6) rotates, the abrasive material (13) comes into contact with the separation pad (11) and removes the paper powder adhering to the surface of the separation pad (11) and also removes the deteriorated layer.
（へ）実施例
以下、図面に沿って、本発明の実施例について説明する
。(F) Examples Examples of the present invention will be described below with reference to the drawings.
なお、前述した部分と同一部分には同一符合を符して説
明を省略する。Note that parts that are the same as those described above are given the same reference numerals, and description thereof will be omitted.
シート給送装置１は、第１図に示すように、給紙ローラ
６の円周の一部に軸方向に延びる研摩材１３を有してお
り、該研摩材１３は、該給紙ローラ６の回転により分離
パッド１１の表面を研摩するように構成されている。As shown in FIG. 1, the sheet feeding device 1 has an abrasive material 13 extending in the axial direction on a part of the circumference of the paper feed roller 6. The rotation of the separation pad 11 polishes the surface of the separation pad 11.
本実施例は以上のような構成よりなるので、図示しない
スタートキーが押されると、カセット２に収納されてい
るシートＳ・・・は給紙ローラ６と分離パッド１１とに
より１枚ずつ分離されて最上位のシートＳのみ給送され
る（第２図参照）。この際、該シートＳの送り長さによ
り短い円周の給紙ローラ６は１回転クラッチ（図示せず
）により１回転して停止するので、研摩材１３が分離パ
ッド１１へ接触することはない。同様の動作により、カ
セット２に収納されているシートＳ・・・を順次給送し
、該カセット２に収納されているシートＳ・・・を全て
給送すると、図示しないシート有無検知手段からのシー
ト無し信号を検知する制御部（図示せず）は給紙ローラ
６を１回転させる。この際、研摩材１３が、分離パッド
１１と摩擦接触し、該パッド１１表面に付着している紙
粉を除去すると共に劣化層を研摩して該パッド１１の摩
擦係数を回復する。これにより、Ｆ＞Ｇ＞Ｈの関係が常
に保持される。Since this embodiment has the above-described configuration, when a start key (not shown) is pressed, the sheets S stored in the cassette 2 are separated one by one by the paper feed roller 6 and the separation pad 11. Only the topmost sheet S is fed (see FIG. 2). At this time, the paper feed roller 6, which has a short circumference depending on the feeding length of the sheet S, makes one rotation and stops using a one-turn clutch (not shown), so the abrasive material 13 does not come into contact with the separation pad 11. . By the same operation, the sheets S... stored in the cassette 2 are sequentially fed, and when all the sheets S... stored in the cassette 2 are fed, a signal from the sheet presence/absence detecting means (not shown) is detected. A control section (not shown) that detects the no-sheet signal rotates the paper feed roller 6 once. At this time, the abrasive material 13 comes into frictional contact with the separation pad 11, removes paper powder adhering to the surface of the pad 11, and polishes the deteriorated layer to restore the friction coefficient of the pad 11. Thereby, the relationship F>G>H is always maintained.
なお、上述実施例において、カセット２に収納している
シート２・・・を全て給送する毎に、給紙ローラ６を１
回転して研摩材１３により分離パッド１１表面を研摩す
るようになっているが、これに限らず、画像形成装置の
電源投入毎に給紙ローラ６を１回転してもよく、また１
回転に限らず複数回転でもよく、更に逆回転でもよい。In the above-mentioned embodiment, each time all the sheets 2 stored in the cassette 2 are fed, the paper feed roller 6 is rotated one time.
The paper feed roller 6 rotates to polish the surface of the separation pad 11 with the abrasive material 13, but the present invention is not limited to this.
It is not limited to rotation, but may be multiple rotations, and may even be reverse rotation.
また、上述実施例において、研摩材１３は給紙ローラ６
の円周の１部に軸方向へ直線上に延びていたが、これに
限らず、第３図に示すように、研摩材１３を分割して配
置してもよい、このようにすると、給紙ローラ６表面の
摩擦係数の変化を低く押差えられて、該給紙ローラ６の
全周においてＦ＞Ｇの関係を保つことができる。Further, in the above embodiment, the abrasive material 13 is
The abrasive material 13 extends linearly in the axial direction along a part of the circumference of the abrasive material 13, but the abrasive material 13 is not limited to this and may be arranged in parts as shown in FIG. Changes in the coefficient of friction on the surface of the paper roller 6 are kept low, and the relationship F>G can be maintained over the entire circumference of the paper feed roller 6.
更に、第４図に示すように、研摩材１３と同期回転して
該研摩材１３と接触するブラシ１５を配設した場合、該
ブラシ１５が研摩材１３を常に清掃して該研摩材１３の
目詰りを防止することができる。Furthermore, as shown in FIG. 4, if a brush 15 is provided that rotates synchronously with the abrasive material 13 and comes into contact with the abrasive material 13, the brush 15 constantly cleans the abrasive material 13 and cleans the abrasive material 13. Clogging can be prevented.
（ト）発明の詳細
な説明したように、シート給送手段に、分離パッドの表
面を研摩する研摩材を設けたので、分離パッドの摩擦係
数を一定に保って、シートの重送を減少することができ
る。(G) As described in detail of the invention, since the sheet feeding means is provided with an abrasive material that polishes the surface of the separation pad, the friction coefficient of the separation pad is kept constant and double feeding of sheets is reduced. be able to.
第１図は本発明のシート給送装置を示す正面断面図であ
り、第２図は本発明の動作を示す正面断面図である。ま
た、第３図及び第４図は本発明の他の実施例を示す図で
ある。更に、第５図から第７図は従来例の構成と動作を
示す正面断面図である。
１．１ａ・・・シート給送装置 、 ６・・・シート給
送手段 、 １１・・・分離パッド 、 １３・・・研
摩材 、 Ｓ・・・シート 。FIG. 1 is a front sectional view showing the sheet feeding device of the present invention, and FIG. 2 is a front sectional view showing the operation of the present invention. Further, FIGS. 3 and 4 are diagrams showing other embodiments of the present invention. Furthermore, FIGS. 5 to 7 are front sectional views showing the configuration and operation of the conventional example. 1.1a... Sheet feeding device, 6... Sheet feeding means, 11... Separation pad, 13... Abrasive material, S... Sheet.
Claims (2)
とを有し、該分離パッドを前記シート給送手段へ付勢し
、該シート給送手段及び分離パッドによりシートを１枚
ずつ分離・給送するシート給送装置において、 前記シート給送手段に、前記分離パッドの表面を研摩す
る研摩材を設けた、 ことを特徴とするシート給送装置。(1) It has a sheet feeding means and a separation pad made of a high coefficient of friction, and the separation pad is urged against the sheet feeding means, and the sheets are separated one by one by the sheet feeding means and the separation pad. A sheet feeding device for feeding a sheet, characterized in that the sheet feeding means is provided with an abrasive material that polishes the surface of the separation pad.
ローラが非シート給送時にも回転する特許請求の範囲第
１項記載のシート給送装置。(2) The sheet feeding device according to claim 1, wherein the sheet feeding means is a feeding roller, and the feeding roller rotates even when the sheet is not being fed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62256606A JP2619883B2 (en) | 1987-10-12 | 1987-10-12 | Sheet feeding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62256606A JP2619883B2 (en) | 1987-10-12 | 1987-10-12 | Sheet feeding device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0198536A true JPH0198536A (en) | 1989-04-17 |
| JP2619883B2 JP2619883B2 (en) | 1997-06-11 |
Family
ID=17294968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62256606A Expired - Fee Related JP2619883B2 (en) | 1987-10-12 | 1987-10-12 | Sheet feeding device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2619883B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5318287A (en) * | 1991-09-11 | 1994-06-07 | Konica Corporation | Bypass sheet feeding device |
| US6042104A (en) * | 1996-09-05 | 2000-03-28 | Canon Kabushiki Kaisha | Sheet supplying apparatus |
| US6877737B2 (en) * | 2000-10-31 | 2005-04-12 | Canon Kabushiki Kaisha | Sheet feeding device having cleaning mode for cleaning separating member and recording apparatus provided with the same |
| JP2011105498A (en) * | 2009-11-20 | 2011-06-02 | Duplo Corp | Paper feeder |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5793838A (en) * | 1980-11-28 | 1982-06-11 | Toshiba Corp | Automatic paper feeder |
-
1987
- 1987-10-12 JP JP62256606A patent/JP2619883B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5793838A (en) * | 1980-11-28 | 1982-06-11 | Toshiba Corp | Automatic paper feeder |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5318287A (en) * | 1991-09-11 | 1994-06-07 | Konica Corporation | Bypass sheet feeding device |
| US6042104A (en) * | 1996-09-05 | 2000-03-28 | Canon Kabushiki Kaisha | Sheet supplying apparatus |
| US6877737B2 (en) * | 2000-10-31 | 2005-04-12 | Canon Kabushiki Kaisha | Sheet feeding device having cleaning mode for cleaning separating member and recording apparatus provided with the same |
| JP2011105498A (en) * | 2009-11-20 | 2011-06-02 | Duplo Corp | Paper feeder |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2619883B2 (en) | 1997-06-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |