JPS62222944A - Separatingly feeding device for sheet material - Google Patents

Abstract

PURPOSE:To securely prevent the occurrence of the double feeding and jamming of sheet materials by providing a paper feeding roller, a separating pad, and a separating auxiliary pad on the separatingly feeding device for sheet materials of the picture image forming device of a copying machine, etc. CONSTITUTION:As for the relation between a separating pad 11, separating auxiliary pads 12, and a paper feeding roller 14, the separating pad 11 is positioned opposite to the paper feeding roller 14, and the separating auxiliary pads 12 are positioned on both sides of the separating pad 11. When a start key is pressed, the paper feeding roller 14 is rotated feeding the sheet material P1 on the topmost position. At this time, sheet materials P2-Pi on the next position and after are also moved followingly, but, due to frictional force, these sheet materials are stopped at a nip part N in the paper feeding roller 14 and the separating pad 11. However, when the frictional force G between the sheet materials P is larger than normally due to, e.g., the effect of static electricity, etc., the sheet material P2 tends to run through the nip part N. In this case, the sheet material P2 is brought into contact with the pads 12 and stopped in a position where the pads 12 are projected out of the top face of the pad 11.

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明はシート材分離給送装置、詳細には例えば複写機
、プリンタ、印刷機等の画像形成装置のシート材分離給
送装置であって摩擦分離によってシート材を給送するシ
ート材分離給送装置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sheet material separation and feeding device, specifically, a sheet material separation and feeding device for an image forming apparatus such as a copying machine, a printer, or a printing machine. The present invention relates to a sheet material separation and feeding device that feeds sheet materials by frictional separation.

［従来の技術］ 従来のこの種の装置について説明する。第７図に示すよ
うに、給紙ローラ４はシート月旦と分離バッド１とに接
する位置にある。シート材旦は中板２２の上に積載され
、下から中板押上げバネ２３によフて上方に持ち上げら
れている。その結果、シート材旦は給紙ローラ２と常時
接触している。[Prior Art] A conventional device of this type will be described. As shown in FIG. 7, the paper feed roller 4 is in a position where it contacts the sheet date and separation pad 1. As shown in FIG. The sheet material is stacked on the middle plate 22 and lifted upward by a middle plate pushing spring 23 from below. As a result, the sheet material is constantly in contact with the paper feed roller 2.

そこで、図示しないスタートキーを押すと、給紙ローラ
２が回転（図示例では時削回り方向）して最上位のシー
ト４４’　Ｐ　ｔを給送する。このとき、２枚目のシー
ト材Ｐ２がシーＩ・材Ｐ１との摩擦力により共に随動し
ようとするが、シー）・材Ｐ２以降のシート材Ｐは分離
バッド１によって停止する。これは、給紙ローラ２とシ
ー］・材Ｐ１との摩擦力をＦ、シート材２間の摩擦力を
Ｇ、シート利Ｐの先端と分離バッド１との反発力をＨと
すれば、その摩擦力はＦ＞＞Ｈ＞Ｇとなっているためで
ある。Then, when a start key (not shown) is pressed, the paper feed roller 2 rotates (in the illustrated example, in the counterclockwise direction) and feeds the uppermost sheet 44'Pt. At this time, the second sheet material P2 tries to move together due to the frictional force with the sheet material P1, but the sheet materials P after the sheet material P2 are stopped by the separation pad 1. This is calculated by assuming that the frictional force between the paper feed roller 2 and the sheet material P1 is F, the frictional force between the sheet material 2 is G, and the repulsive force between the tip of the sheet material P and the separation pad 1 is H. This is because the frictional force is F>>H>G.

そして、シート材Ｐは第７図に示すように、シート材の
先端か分動パット１に順次光たることで１枚ずつ捌かれ
、最上位のシート材Ｐ、のみ給紙される。Then, as shown in FIG. 7, the sheet materials P are separated one by one by being sequentially illuminated by the tip of the sheet material or the separation pad 1, and only the uppermost sheet material P is fed.

ところが、実際にシート材Ｐが分離バラｉ−１によって
捌かれる部分は給紙ローラ４と分動パッド１の接してい
る点Ｎの近傍てあり、第８図のようにこの点を乗り越え
てしまうとシーｉ・材Ｐは充分分離できないことがある
。However, the part where the sheet material P is actually separated by the separating rose i-1 is near the point N where the paper feed roller 4 and the separation pad 1 are in contact, and the sheet material P is actually separated by the separating rose i-1, and the part passes over this point as shown in FIG. In some cases, it may not be possible to separate the material I and material P sufficiently.

これは、分動パット１の摩擦力Ｈを高めてゆくとシート
材Ｐの紙質によっては給紙ローラ４の摩擦力Ｆとのバラ
ンスが悪くなり、最上位シート材Ｐ１を搬送できない場
合が生しるためて、あまり分離バラ］・の摩擦力を」二
げるごとはてきない。This is because as the frictional force H of the separation pad 1 is increased, the balance with the frictional force F of the paper feed roller 4 becomes worse depending on the paper quality of the sheet material P, and the uppermost sheet material P1 may not be conveyed. Therefore, it is not possible to reduce the frictional force of the separated rose too much.

その対策として、分出１１バット１を給紙ローラＡに沿
うように曲面にし、接点Ｎを越えてからも分動し易くし
ても良いが、この場合は、分離パッド１の曲面の中心と
給紙ローラ４の中心をだいたい合わせなければならず、
部品の精度が問題となってくる。As a countermeasure, the separating pad 11 butt 1 may be curved so as to follow the paper feed roller A so that it can easily separate even after passing the contact point N. In this case, the center of the curved surface of the separating pad 1 and The center of the paper feed roller 4 must be roughly aligned.
Part accuracy becomes an issue.

又、分離力を高めるために車に圧接力を高めると、分離
バットと給紙ローラ間て紙かジャムしてしまうことがあ
る。Furthermore, if the pressure applied to the wheel is increased in order to increase the separation force, paper may jam between the separation bat and the paper feed roller.

［発明の目的］ 木発明は、上述従来例の欠点に鑑みてなされたもので、
シート材の重送か確実に防止されるシート材分庫１給送
装置を提供することを１］的とする。[Object of the invention] The wooden invention was made in view of the drawbacks of the above-mentioned conventional examples.
It is an object of the present invention to provide a sheet material storage 1 feeding device that reliably prevents double feeding of sheet materials.

［問題点を解決するための手段］ 」二記目的を達成するために本発明に係るシート材分動
給送装置は、載置部に積載さオ］たシート材を一枚ずつ
分離して給送するシート材分動給送装置において、シー
ト材を給送する回転部利と、該回転部材に対向して設け
られ、シート材を摩擦分離する摩擦部材と、該回転部材
に対向しない位置に設６づられ、該摩擦部羽よりも該回
転部材側に一部突出している補助摩擦部材とを有するこ
とを特徴とする。[Means for Solving the Problems] In order to achieve the second object, the sheet material separation feeding device according to the present invention separates the sheet materials stacked on the loading section one by one. In a sheet material separation feeding device, a rotating part that feeds the sheet material, a friction member that is provided opposite to the rotating member and frictionally separates the sheet material, and a position that is not opposed to the rotating member. It is characterized in that it has an auxiliary friction member provided at 6 and partially protruding from the friction portion blades toward the rotating member side.

［実施例］ 第１図〜第６図は木発明の実施例て、１１は摩擦部材と
しての分離パラ］・、１２は補助摩擦部材としての分離
補助パッド、１３は分動バッドホルダー、１４は回転部
材としての給紙ローラである。分離バット１１と分動補
助バッド１２と給紙ローラ１４の関係は、給紙ローラＩ
４と対向する位置に分離パッド１１が位置し、その両サ
イド（給紙ローラ１４に対向しない位置）に分前補助バ
ット１２が位置している。Ｐはシート材、２２はシート
材Ｐを積載する載置部としての中板、２３は中板２２上
にあるシート材Ｐを給紙ローラ１４に圧接するためのバ
ネである。[Example] Figures 1 to 6 show examples of the wooden invention, 11 is a separation pad as a friction member, 12 is a separation auxiliary pad as an auxiliary friction member, 13 is a swinging pad holder, and 14 is a separation pad holder. A paper feed roller is a rotating member. The relationship between the separation bat 11, the separation auxiliary pad 12, and the paper feed roller 14 is as follows:
A separation pad 11 is located at a position facing the paper feed roller 4, and a separating pad 11 is located on both sides thereof (at a position not facing the paper feed roller 14). P is a sheet material, 22 is an intermediate plate serving as a loading section on which the sheet material P is stacked, and 23 is a spring for pressing the sheet material P on the intermediate plate 22 against the paper feed roller 14.

分離バット１１と分離補助パッド１２の関係は、第２図
に示すように、バット人口側Ｅでは分離バット１１の上
面の方が高く、出口例（図面左方）では逆転して分離補
助バット１２の上面１２ａの方が高くなっている（給紙
ローラ１４側に一部突出する）。The relationship between the separation butt 11 and the separation auxiliary pad 12 is as shown in FIG. The upper surface 12a of is higher (partially protrudes toward the paper feed roller 14 side).

これを断面ＯＡ、ＯＢ、ＱＣでみると、第３図（ａ）、
（ｂ）、（ｃ）に示す形となる。When looking at this in cross sections OA, OB, and QC, Figure 3 (a),
The shapes are shown in (b) and (c).

給紙ローラ１４とシート材の摩擦力をＦ、分離バッド１
１とシートに７１’　Ｐの摩擦力をＨ１分分離補助パッ
ド１２シート材Ｐの摩擦力を■、シート月Ｐ同志の摩擦
力をＧとすると、Ｆ＞ＨｌＩ＞Ｇであり、ＨとＩはどち
らが大きくても良い。The frictional force between the paper feed roller 14 and the sheet material is F, and the separation pad 1 is
If the frictional force of 71' P between 1 and sheet is H1, the frictional force of separation auxiliary pad 12 sheet material P is ■, and the frictional force between sheets P is G, then F>HlI>G, and H and I are It doesn't matter which one is bigger.

第４図において、図示しないスタートキーを押すと、給
紙ローラ１４が回転し給紙ローラ１４と接触している最
上位のシート材Ｐ１を給紙する。In FIG. 4, when a start key (not shown) is pressed, the paper feed roller 14 rotates and feeds the uppermost sheet material P1 that is in contact with the paper feed roller 14.

このとき、次位以降の紙等Ｐ２〜Ｐｉも随動しようとす
るが、前記摩擦力Ｆ、Ｇ、Ｈの関係から、第５図に示す
ように、シート材は給紙ローラ１４と分離バット１１内
のニップ部Ｎで停止する。At this time, the subsequent sheets P2 to Pi also try to move, but due to the relationship between the frictional forces F, G, and H, as shown in FIG. It stops at the nip part N in 11.

しかしながら、シート材２間の摩擦力Ｇが、たとえば静
電気等の影響で通常より大きい場合、次位のシート材Ｐ
２がニップ部Ｎを乗り越えようとする。However, if the frictional force G between the sheet materials 2 is larger than usual due to the influence of static electricity, etc., the next sheet material P
2 tries to get over the nip part N.

このときは、第６図（断面図では第３図（Ｃ））で示す
ように、分離補助パッド１２か分離バッド１１の上面よ
りも突出している位置において、シート材Ｐ２は分離補
助バット１２に接触し、停止する。At this time, as shown in FIG. 6 (FIG. 3 (C) in the sectional view), the sheet material P2 is attached to the separation auxiliary bat 12 at a position where the auxiliary separation pad 12 protrudes from the upper surface of the separation pad 11. Contact and stop.

即ち、従来ニップ部Ｎの近傍で分離していたものか、ニ
ップ部Ｎを越えた位１６ても分離可能となる。In other words, it becomes possible to separate the parts that were conventionally separated near the nip part N or even beyond the nip part N.

以上か本発明に係るシート材分帥給送装置の一実施例の
説明であるが、本発明はこの実施例に限定されない。The above is a description of one embodiment of the sheet material batch feeding device according to the present invention, but the present invention is not limited to this embodiment.

例えば、分刻補助バット１２の表面を直線としたが、給
紙ローラ１４と沿うような曲面であっても良い。たたし
、給紙ローラ１４とぴったり沿う必要は無い。第１０図
において、３１は曲面Ｒを有する分離パッドであり、３
２は分離補助ノペットである。３３は台である。For example, although the surface of the dividing auxiliary vat 12 is a straight line, it may be a curved surface that runs along the paper feed roller 14. However, it is not necessary to line up exactly with the paper feed roller 14. In FIG. 10, 31 is a separation pad having a curved surface R;
2 is a separation auxiliary noppet. 33 is a stand.

また、分離パッド１１．３１と分離補助バット１２．３
２の材質は同一ても異っていても良し＼。In addition, separation pad 11.31 and separation auxiliary bat 12.3
The materials of 2 may be the same or different.

また、分離補助パラＦ１１．３１は分離ノベットの両サ
イドに設けたが、第１１図に示すように、補助パッド４
２を分離バット４１の中央部と両サイトに位置ずＺよう
にしてもよいし、又は中央部のみても効果は得られる。In addition, the separation auxiliary pads F11.31 were provided on both sides of the separation Novet, but as shown in Fig. 11, the auxiliary pads 4
2 may be located at the center of the separation bat 41 and at both sites, or the effect can be obtained even if it is located only at the center.

又、そのと剖の給紙ローラ４４は中央部が切り取られた
形になってし）る。Further, the paper feed roller 44 has a shape in which the center portion is cut off.

また、本実施例は給紙ローラを九ローラとしたが、これ
は第１２図に示したように半月状の給紙ローラ５４とそ
の両サイドに補助コロ５５を設けた給紙方式においても
有効である。この場合は補助コロ５５を分離補助バット
１２に対向する位置に設ける。補助コロ５５の外形は給
紙ローラ５４より小さくしてあり、給紙中は分ｍ１を補
助バット１２とずきまを生じる。In addition, in this embodiment, nine rollers were used as the paper feed rollers, but this is also effective in a paper feed system in which a half-moon-shaped paper feed roller 54 and auxiliary rollers 55 are provided on both sides of the paper feed roller 54, as shown in FIG. It is. In this case, the auxiliary roller 55 is provided at a position facing the separation auxiliary vat 12. The outer diameter of the auxiliary roller 55 is smaller than that of the paper feed roller 54, and creates a gap m1 between the auxiliary bat 12 and the auxiliary bat 12 during paper feeding.

以」−説明したＪ：うに本発明の実施例の構成によると
、分動バッドの両サイトに分離補助バットを設けたこと
でシート第４を分離する機会を多くとれるようになり、
重送を確実に防止することが可能となった。According to the configuration of the embodiment of the present invention, separation auxiliary butts are provided at both sites of the swinging bat, so that more opportunities can be taken to separate the fourth sheet.
This makes it possible to reliably prevent double feeding.

また、給紙口〜うの無い所の分離バットを高くするのて
、給紙ローラと分離補助バラ１−の位置精度が暫びしく
なくてもよい。Furthermore, by increasing the height of the separation butt between the paper feed port and the area where there is no hole, the positional accuracy of the paper feed roller and the separation auxiliary rose 1- does not have to be so poor.

また、分離補助バットの人口側の上面を分離バットの上
面と同−又は低くしであるのて、シー１−４４が分離パ
ッド部に入るときに分離補助バットかシート材の進入を
阻害しない。Furthermore, since the upper surface of the artificial side of the separation auxiliary bat is set at the same level or lower than the upper surface of the separation bat, when the sear 1-44 enters the separation pad portion, the entrance of the separation auxiliary bat or the sheet material is not obstructed.

また、分離補助パッドの摩擦係数を高くすることで、分
離パッドと給紙ローラの圧接力を蒔くシても分離補助バ
ットで充分分動することが可能となり、分離パッドと給
紙ローラの寿命を延ばすことが可能となった。In addition, by increasing the friction coefficient of the separation auxiliary pad, the separation auxiliary bat can move sufficiently even when the separation pad and paper feed roller are in contact with each other, thereby extending the life of the separation pad and paper feed roller. It was possible to extend it.

［発明の効果］ 本発明に係るシート材分Ｉ！ＩＩ給送装置は上述の通り
の構成であるので、シート材の重送が防止できるという
効果がある。[Effect of the invention] Sheet material I according to the invention! Since the II feeding device has the above-described configuration, it has the effect of preventing double feeding of sheet materials.

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

第１図は本発明に係る分離パッドの一実施例を示す斜視
図、第２図は給紙ローラと分動バッドの関係を示す正面
図、第３図（ａ）（ｂ）（ｃ）は同じく横断面図、第４
図〜第６図はシート材の分離給送状態を説明する正面図
、第７図〜第９図は各々が異ｔする他の実施例を示す斜
視図、第１０図・第１１図は従来のシート材の分動給送
状態を説明する正面図、第１２図は従来例の斜視図であ
る。 １１．３１．４１−−一分離パッド、 １２．３２．４２−ｍ−分離補助バット、１４．４４．
５４−−一給紙ローラ。FIG. 1 is a perspective view showing an embodiment of the separation pad according to the present invention, FIG. 2 is a front view showing the relationship between the paper feed roller and the swing pad, and FIGS. 3(a), (b), and (c) are Similarly, cross-sectional view, No. 4
6 to 6 are front views illustrating the separation and feeding state of sheet materials, FIGS. 7 to 9 are perspective views showing other different embodiments, and FIGS. 10 and 11 are conventional FIG. 12 is a front view illustrating the partial feeding state of the sheet material, and FIG. 12 is a perspective view of the conventional example. 11.31.41--separation pad, 12.32.42-m-separation auxiliary bat, 14.44.
54--One paper feed roller.

Claims (1)

【特許請求の範囲】[Claims] （１）載置部に積載されたシート材を一枚ずつ分離して
給送するシート材分離給送装置において、 シート材を給送する回転部材と、 該回転部材に対向して設けられ、シート材 を摩擦分離する摩擦部材と、 該回転部材に対向しない位置に設けられ、 該摩擦部材よりも該回転部材側に一部突出している補助
摩擦部材と、 を有するシート材分離給送装置。(1) A sheet material separation and feeding device that separates and feeds sheet materials loaded on a loading section one by one, comprising: a rotating member that feeds the sheet materials; and a rotating member provided opposite to the rotating member; A sheet material separation and feeding device comprising: a friction member that frictionally separates sheet materials; and an auxiliary friction member provided at a position not facing the rotating member and partially protruding from the friction member toward the rotating member.