JPH01156239A - Sheet feeder - Google Patents

Sheet feeder

Info

Publication number
JPH01156239A
JPH01156239A JP31722887A JP31722887A JPH01156239A JP H01156239 A JPH01156239 A JP H01156239A JP 31722887 A JP31722887 A JP 31722887A JP 31722887 A JP31722887 A JP 31722887A JP H01156239 A JPH01156239 A JP H01156239A
Authority
JP
Japan
Prior art keywords
sheet
slip
roller
rollers
sheet feeding
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
JP31722887A
Other languages
Japanese (ja)
Inventor
Takahiro Azeta
孝弘 畔田
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 JP31722887A priority Critical patent/JPH01156239A/en
Publication of JPH01156239A publication Critical patent/JPH01156239A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To prevent noise preventing a slip from being easily generated while absorbing vibration even when the slip is generated by constituting at least the peripheral part of retaining rotary members of elastic materials. CONSTITUTION:A feed of paper is performed by a cylindrical part of a sheet feed roller 1, continuing till a sheet is held in its point end by paired resist rollers 13. Here because the sheet 7 is fed while it is brought into contact with retaining rollers 3, 3', the sheet 7 is pulled in its part between the retaining rollers 3, 3 ' and a separator pad 12 by the paired resist rollers 13 in the downstream side of conveyance, and the sheet 7, even when it tends to generate a stick slip, inhibits its generation by elastic materials 11, 11'. While in case of generating the slip, because vibration of the slip is absorbed by the elastic materials 11,11', the generation of so-called noise in the separator pad 12 and the sheet 7 can be prevented.

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、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、特に半月状のシーI・
給送回転体を有する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 or a laser beam printer.
The present invention relates to a sheet feeding device having a feeding rotary body.

(ロ) 従来の技術 従来、画像形成装置のシー1〜給送装置A′は、第4図
に示すように、駆動軸10に固着されたゴム等の弾性材
からなり、断面形状が半月状であるシート給送ローラ1
と、その両端部に固定された合成樹脂等で形成された補
助カム2,2′とさらにその外側に駆動軸10に対し回
転自在に保持された合成樹脂等でできた押さえローラ3
,3′と、これらシート給送四−ラ1、補助カム2,2
′、押さえローラ3.3′に圧接して設けられたゴム等
の摩擦部材からなる分離パッド12からなっている。
(B) Prior Art Conventionally, as shown in FIG. 4, the sheet 1 to the feeding device A' of an image forming apparatus are made of an elastic material such as rubber fixed to a drive shaft 10, and have a semicircular cross-sectional shape. The sheet feeding roller 1 is
, auxiliary cams 2 and 2' made of synthetic resin or the like fixed to both ends thereof, and a pressing roller 3 made of synthetic resin or the like held rotatably with respect to the drive shaft 10 on the outside thereof.
, 3', these sheet feeding four-ra 1, auxiliary cams 2, 2
', and a separation pad 12 made of a friction member such as rubber, which is provided in pressure contact with a pressing roller 3.3'.

第5図は、第4図に示す従来のシート給送装置A′の側
面図であって、カセットと、シート給送装置との位置関
係を示すものであって、カセッ1〜5内への中板6に載
置されたシート7はシート給送ローラ1と、分離パッド
12により1枚ずつ分離されてレジストローラ対13の
間に送り込まれる。
FIG. 5 is a side view of the conventional sheet feeding device A' shown in FIG. The sheets 7 placed on the intermediate plate 6 are separated one by one by a sheet feeding roller 1 and a separation pad 12 and sent between a pair of registration rollers 13.

第6図は、第5図に示すシート給送装置A′をさらに詳
細に示す図で、理解しやすいようシー1−給送ローラ1
は実線で、補助カム2は破線で、押さえローラ3は1点
鎖線で示しである。
FIG. 6 is a diagram showing the sheet feeding device A' shown in FIG. 5 in more detail.
is shown by a solid line, the auxiliary cam 2 is shown by a broken line, and the press roller 3 is shown by a chain line.

押さえローラ3は円筒形をしており、それに対してシー
ト給送ローラ」は略平坦な部分1. aと、円筒形の部
分1bとからなる半月状をしており、図かられかるよう
に略平坦な部分1aは押さえローラ3より内側にあり、
円筒形の部分1bは押さえローラ3よりやや径が大きい
The holding roller 3 has a cylindrical shape, whereas the sheet feeding roller has a substantially flat portion 1. It has a half-moon shape consisting of a cylindrical portion 1b and a cylindrical portion 1b, and as can be seen from the figure, the substantially flat portion 1a is located inside the pressing roller 3.
The cylindrical portion 1b has a slightly larger diameter than the pressing roller 3.

また、補助カム2は押さえローラ3より外側に出たカム
部2aを有し、カム部以外の部分は押さえローラ3より
小さな径になっている。
Further, the auxiliary cam 2 has a cam portion 2a extending outward from the press roller 3, and the diameter of the portion other than the cam portion is smaller than that of the press roller 3.

さて、上述の従来装置の作用を説明すると、シー1〜搬
送前の静止状態にあっては、第6図に示すようにシート
給送ローラ1の平坦部1aは下側に向いており、押さえ
ローラ3のみが分離パッド12と接1ノでいる。
Now, to explain the operation of the above-mentioned conventional device, in the stationary state before conveying the sheet 1, the flat portion 1a of the sheet feeding roller 1 faces downward as shown in FIG. Only the roller 3 is in contact with the separation pad 12.

そして、シー1へ7は、第5図に示すようにその先端部
が押さえローラ3に接触している。
The tip of the sear 1 to 7 is in contact with the pressing roller 3, as shown in FIG.

この状態でシー1へ給送が開始されると、駆動軸10の
回転に従ってシーl−給送ローラ]と補助カム2が回転
し、まず補助カム2のカム部2aが分離パッド12を押
し下げ、続いてシート給送ローラ1の円筒形部分1bが
滑かにシー1−7に当接して給紙が開始される。
When feeding to the sear 1 is started in this state, the seal l-feeding roller] and the auxiliary cam 2 rotate as the drive shaft 10 rotates, and the cam portion 2a of the auxiliary cam 2 pushes down the separation pad 12. Subsequently, the cylindrical portion 1b of the sheet feeding roller 1 smoothly contacts the sheet 1-7 to start feeding the sheet.

給紙はシート給送ローラ1の円筒形部分1)〕により、
シート先端がレジストローラ対13に(よさまれるまて
続き、を回転して、再び第6図の状態となって静止状態
に戻る。このように、押さえローラ3と分離パッド12
て押さえながらシート7を送るため、二重送りを防止す
ることができる。
The paper is fed by the cylindrical portion 1) of the sheet feeding roller 1.
The leading edge of the sheet continues to be moved by the pair of registration rollers 13, rotates, and returns to the stationary state as shown in FIG.
Since the sheet 7 is fed while being held down, double feeding can be prevented.

0勺 発明が解決しようとする問題点 ところが、上述の従来例においては、シー )、7を分
離パッド12と押さえローラ3の間で押さえながら搬送
するため、シート7のスティックスリップが生じやすく
、該スリップにより生しる振動によりシート7及び分離
パッド12を固定している部材が共振して振動する、い
わゆる鳴きが発生しやすい。
Problems to be Solved by the Invention However, in the above-mentioned conventional example, since the sheet 7 is conveyed while being pressed between the separation pad 12 and the pressing roller 3, stick-slip of the sheet 7 tends to occur. Due to the vibration caused by the slip, the members fixing the sheet 7 and the separation pad 12 resonate and vibrate, which is likely to cause so-called squealing.

更に、押さえローラ3,3′の押さえ力のアンバランス
によるシー1−7の斜行等のシー1〜給送不良を防止す
るため、分離パッド12をイコライズさせて給紙する方
法もあるが、これによると、分離パッド12のガタが大
きくなり、−層鳴きが生じやすくなってしまう。
Furthermore, in order to prevent feeding defects such as skewing of sheets 1-7 due to unbalanced pressing force of the pressing rollers 3 and 3', there is a method of feeding sheets by equalizing the separation pad 12. According to this, the backlash of the separation pad 12 becomes large, and negative layer squeal is likely to occur.

(ロ)問題点を解決するだめの手段 本発明は、上述問題点を解消することを目的とするもの
であって、シート給送回転体と、分離部材と、該分離部
材に圧接する押さえ回転体を有するシート給送装置にお
いて、前記押さえ回転体の少なくとも外周部を弾性材に
て構成したことを特徴とするものである。
(B) Means for solving the problem The present invention aims to solve the above-mentioned problem, and includes a sheet feeding rotary body, a separating member, and a presser rotation member that presses against the separating member. In the sheet feeding device having a body, at least an outer peripheral portion of the pressing rotating body is made of an elastic material.

(ホ) 作用 上述構成に基づき、押さえ回転体と分離部材の間をシー
1〜が搬送下流側で(例えばレジストローラ対)により
引っ張られてスティックスリップが生しようとしても、
押さえ回転体周囲の弾性材によって、該スリップを生じ
に<<シ、また生したとしても弾性材によってその振動
が吸収されて鳴きが発生する乙とがない。
(E) Effect Based on the above-mentioned configuration, even if the seams 1 to 1 are pulled between the presser rotating body and the separating member on the conveying downstream side (for example, by a pair of registration rollers) and stick-slip occurs,
The elastic material around the presser rotating body prevents this slip from occurring, and even if it does occur, the vibration is absorbed by the elastic material and no squeal occurs.

(へ)実施例 以下、図面に沿って本発明による実施例について説明す
る。
(F) Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

なお、前述した従来のシート給送装置と同一部分は同一
符号を付してその説明を省略する。
Note that the same parts as those of the conventional sheet feeding device described above are given the same reference numerals, and the explanation thereof will be omitted.

シート給送装置Aは、第1図に示すように、押さえロー
ラ3,3′を有しており、かつ該ローラ3゜3′には弾
性体1),1)’がそれぞれの外周部に設けられている
。また該弾性体1).,1.1’は、第2図に示すよう
に、円筒状の合成樹脂等からなり、かつ前記押さえロー
ラ3,3′の外周部に同心状ζこ固着され、更に該ロー
ラ3,3′は、シート給送ローラ1の平坦部分1a、補
助カム2,2′が分79 ノfッド12と接していない
際に、該分離パッド12と接するように構成されている
The sheet feeding device A, as shown in FIG. It is provided. Also, the elastic body 1). , 1.1' are made of cylindrical synthetic resin or the like, as shown in FIG. is configured so that the flat portion 1a of the sheet feeding roller 1 and the auxiliary cams 2, 2' come into contact with the separation pad 12 when they are not in contact with the nozzle 12.

本実施例は、以上のような構成よりなるので、シー1〜
7の先端部が押さえローラ3に接触してし)る状態から
シー1へ給送が開始されると、駆動軸】0の回転により
シー1〜給送ローラ1と補助カム2が回転し、補助カム
2のカム部2aが分離ノマツ1ζ12aを押し下げ、続
いてシー1〜給送ローラ1の円筒形部分1bが滑かにシ
ー1−7に当接して給紙が開始される。そして、給紙は
シート給送ローラ1の円筒形部分1bにより、シート先
端がレジストローラ対13には挾持されるまで続き、を
回転して再び前回の静止状態に戻る。
This embodiment has the above configuration, so Sea 1 to
When feeding to the sear 1 is started from a state where the tip of the roller 7 is in contact with the presser roller 3, the rotation of the drive shaft causes the sear 1 to the feeding roller 1 and the auxiliary cam 2 to rotate. The cam portion 2a of the auxiliary cam 2 pushes down the separation pin 1ζ12a, and then the cylindrical portion 1b of the sheet 1 to the feeding roller 1 smoothly abuts the sheet 1-7, and paper feeding is started. Then, the sheet feeding continues until the leading edge of the sheet is clamped by the pair of registration rollers 13 by the cylindrical portion 1b of the sheet feeding roller 1, and then rotates and returns to the previous stationary state again.

この際、シート7は押さえローラ3,3′に接しながら
給送されるため、押さえローラ3,3′と分離パッド1
2の間をシート7が搬送下流側のレジストローラ対13
によって引っ張られてスティックスリップが生じようと
しても、弾性体1),1)′によって該スリップの発生
を阻止され、また該スリップが発生した場合でも弾性体
1).1)’によりその振動を吸収されるため、分離パ
ッド12やシート7のいわゆる鳴きの発生を防ぐ乙とが
できる。
At this time, since the sheet 7 is fed while contacting the press rollers 3, 3', the sheet 7 is fed while being in contact with the press rollers 3, 3' and the separation pad 1.
The sheet 7 is conveyed between the pair of registration rollers 13 on the downstream side.
Even if stick-slip occurs due to tension caused by the elastic bodies 1), 1)', this slip is prevented from occurring, and even if the slip occurs, the elastic bodies 1), 1)' prevent the occurrence of stick-slip. 1) Since the vibration is absorbed by ', it is possible to prevent the occurrence of so-called squealing of the separation pad 12 and the sheet 7.

また、第3図に示すように押さえローラ3,3′の外周
部にスプライン状の溝を形成し、がっ弾性体15の内部
に突起を設けて図のように嵌め込み、押さえローラ3,
3′に対して弾性体15が滑らずかつ弾性体15が破損
した場合にも容易に交換し得るように構成しても良い。
Further, as shown in FIG. 3, a spline-shaped groove is formed on the outer periphery of the presser rollers 3, 3', and a protrusion is provided inside the elastic body 15 and fitted as shown in the figure.
It may be configured such that the elastic body 15 does not slip with respect to 3' and can be easily replaced even if the elastic body 15 is damaged.

更に、押さえローラ3,3′の全体を弾性材により製作
しても上述同様の効果が得られることは勿論である。
Furthermore, it goes without saying that the same effect as described above can be obtained even if the press rollers 3, 3' are entirely made of an elastic material.

(ト)  発明の詳細 な説明したように、本発明によれば、給送されるシート
に押さえ回転体に設けた弾性材が接することにより、該
シートがレジストローラ対等に引っ張られてスティック
スリップが生じようとしても該スリップの発生を阻止す
ることができ、これにより分離パッドやシートの鳴きの
発生を効果的に防止することができる。また、押さえ回
転体の押圧力のバランスを等しくするために、分離パッ
ドをイコライズさせ、これによりガタが大きくなった場
合にも、同様に鳴きの発生を防止することができ、搬送
性能の高いイコライズを用いかつ騒音等の悪影響を生ず
ることなくしたシート給送装置を提供することができる
(G) As described in detail, according to the present invention, the elastic material provided on the presser rotating body comes into contact with the sheet being fed, so that the sheet is pulled by the registration rollers, thereby preventing stick-slip. Even if the slip is about to occur, the slip can be prevented from occurring, thereby effectively preventing the separation pad or sheet from squeaking. In addition, in order to equalize the balance of the pressing force of the presser rotating body, the separation pad is equalized, and even if there is a large backlash, it is possible to prevent the occurrence of squealing, and the equalization has high conveying performance. Accordingly, it is possible to provide a sheet feeding device that uses the above-described method and does not cause any adverse effects such as noise.

更に、押さえ回転体の外周部をスプライン状に形成し、
かつ弾性材に内周に該スプラインに嵌合し得る突起を設
けると、該弾性材が破損した場合に、該弾性材のみを簡
単に交換することができる。
Furthermore, the outer periphery of the holding rotor is formed into a spline shape,
In addition, if the elastic material is provided with a protrusion on its inner periphery that can fit into the spline, only the elastic material can be easily replaced if the elastic material is damaged.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明に係るシート給送装置を示す斜視図、第
2図はその押さえローラ及び弾性材を示す側面図、第3
図は押さえローラの他の実施例を示す側面図、第4図は
従来のシー1−給送装置を示す斜視図、第5図はその側
面図、第6図はその要部を拡大した側面図である。 1・・・シート給送回転体(ローラ)、3,3’・押さ
え回転体(ローラ)  、  7・・シート 、10 
駆動軸 、 1),1)’・・弾性材(弾性体) 、 
 12・・分離部材(分離パッド) 、A シート給送
装置 。
FIG. 1 is a perspective view showing a sheet feeding device according to the present invention, FIG. 2 is a side view showing its pressing roller and elastic material, and FIG.
The figure is a side view showing another embodiment of the holding roller, FIG. 4 is a perspective view showing a conventional sea 1-feeding device, FIG. 5 is a side view thereof, and FIG. 6 is a side view showing an enlarged main part thereof. It is a diagram. 1... Sheet feeding rotating body (roller), 3, 3', holding rotating body (roller), 7... Sheet, 10
Drive shaft, 1), 1)'... Elastic material (elastic body),
12... Separation member (separation pad), A sheet feeding device.

Claims (2)

【特許請求の範囲】[Claims] (1)シート給送回転体と、分離部材と、該分離部材に
圧接する押さえ回転体を有するシート給送装置において
、 前記押さえ回転体の少なくとも外周部を弾性材にて構成
したことを特徴とするシート給送装置。
(1) A sheet feeding device having a sheet feeding rotary body, a separating member, and a holding rotary body that presses against the separating member, characterized in that at least an outer peripheral portion of the holding rotary body is made of an elastic material. sheet feeding device.
(2)前記押さえ回転体の外周部をスプライン状に形成
し、かつ前記弾性材の内周に該スプラインに嵌合し得る
突起を設け、着脱自在とした特許請求の範囲第1項記載
のシート給送装置。
(2) The sheet according to claim 1, wherein the outer circumference of the holding rotor is formed into a spline shape, and the inner circumference of the elastic material is provided with a protrusion that can fit into the spline, so that the sheet is detachable. Feeding device.
JP31722887A 1987-12-14 1987-12-14 Sheet feeder Pending JPH01156239A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31722887A JPH01156239A (en) 1987-12-14 1987-12-14 Sheet feeder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31722887A JPH01156239A (en) 1987-12-14 1987-12-14 Sheet feeder

Publications (1)

Publication Number Publication Date
JPH01156239A true JPH01156239A (en) 1989-06-19

Family

ID=18085906

Family Applications (1)

Application Number Title Priority Date Filing Date
JP31722887A Pending JPH01156239A (en) 1987-12-14 1987-12-14 Sheet feeder

Country Status (1)

Country Link
JP (1) JPH01156239A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0318041U (en) * 1989-07-06 1991-02-22
US5183248A (en) * 1989-08-28 1993-02-02 Mita Industrial Co., Ltd. Sheet feeding device
JP2009242104A (en) * 2008-03-31 2009-10-22 Satoru Aikawa Paper feeding roller
US7614622B2 (en) * 2004-07-27 2009-11-10 Canon Kabushiki Kaisha Sheet feeding apparatus and image forming apparatus
JP2015137155A (en) * 2014-01-21 2015-07-30 シャープ株式会社 Paper feeder and image formation apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0318041U (en) * 1989-07-06 1991-02-22
US5183248A (en) * 1989-08-28 1993-02-02 Mita Industrial Co., Ltd. Sheet feeding device
US7614622B2 (en) * 2004-07-27 2009-11-10 Canon Kabushiki Kaisha Sheet feeding apparatus and image forming apparatus
JP2009242104A (en) * 2008-03-31 2009-10-22 Satoru Aikawa Paper feeding roller
JP2015137155A (en) * 2014-01-21 2015-07-30 シャープ株式会社 Paper feeder and image formation apparatus

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