JP4003073B2

JP4003073B2 - Paper feeder

Info

Publication number: JP4003073B2
Application number: JP2003169142A
Authority: JP
Inventors: 真悟高井; 靖司橋本
Original assignee: リコープリンティングシステムズ株式会社
Priority date: 2003-06-13
Filing date: 2003-06-13
Publication date: 2007-11-07
Anticipated expiration: 2023-06-13
Also published as: JP2005001855A

Description

【０００１】
【発明の属する技術分野】
本発明は、電子写真装置の給紙装置であって、その中でも空気流を利用した給紙装置に関するものである。
【０００２】
【従来の技術】
図１は、空気流を利用した給紙装置、即ち一般にエア吸引方式とか、エア分離方式と呼ばれる従来の電子写真装置の給紙装置の構造を示したものである。図１において、用紙昇降テーブル１に積載された用紙２は用紙上面検出センサ３と、この用紙上面検出センサ３の情報を基に用紙昇降テーブル１の駆動を制御する制御手段４により、常に一定高さに位置するように制御されている。用紙２の上方には真空充気室５と、一般に吸着ベルト６と呼ばれる吸引穴を持つベルト部材と、この吸着ベルト６を駆動するための駆動装置７が設置されている。
【０００３】
用紙の搬送方向前面には、積載された用紙の上層部を空気流の吹き付けにより分離し、浮上させるための空気噴出器８が備えられており、この空気噴出器８により、浮上した用紙２を吸着ベルト６が吸着し、搬送することで給紙を行う仕組みとなっている。
【０００４】
用紙搬送方向の下流には、吸着搬送される用紙２を受け取り、図示しない画像形成部へと搬送する用紙搬送手段であるいわゆる搬送ローラ９が備えられている。
【０００５】
このように構成された給紙装置において、前記した空気の吹き付けによる十分な用紙の分離、浮上効果を得るため、従来から種々の工夫がなされている。例えば、図２に示すように、前記した空気噴出器８の構成を、用紙２に対し水平、または斜め上方に空気を吹き付け、上層部の用紙の分離と浮上を行う主噴出口１０と、吸着ベルト６に向かって斜め上方に空気を吹き付け、吸着ベルト６から反射してくる空気流により最上部用紙とその下の用紙、つまり、１枚目と２枚目の用紙の分離を行う補助噴出口１１という具合に、役割に応じて独立した複数の噴出口を設けることにより確実な分離、浮上効果を確保する方法である（例えば、特許文献１参照。）。
【０００６】
また、上記例に示した用紙の分離、浮上の機構に加え、さらにその性能を高めるため、空気噴出口の形状を工夫した例がある。本例は、前記の分離、浮上を行う主噴出口にあたる噴出口の形状を台形形状とし、積載された用紙の下方から上方に行くに従って吹き付け圧が小さくなるようにして分離性能を向上させ、用紙の束が吸着ベルトに到達し、重送が発生しないように工夫したものである（例えば、特許文献２参照。）。
【０００７】
さらに、空気噴出口の形状を工夫する他の例として、前記した空気噴出口の形状を“Ｈ”形、あるいは他の複数の幾何学形状を組み合わせた形状とし、空気流による用紙の分離と浮上のバランスを用紙の上下方向において任意に変化させようにしたものである（例えば、特許文献３参照。）。本例は、上記した特許文献２の発展型であると言える。
【０００８】
近年の電子写真業界におけるカラー印刷化や印刷物の多様化に伴ない、光沢性があり、用紙の平滑度が高いコート紙や、あるいはトレーシングペーパのような薄い用紙、さらにはＯＨＰなどの紙葉類への印刷に対応すべく、さらに分離、浮上性能を向上させる方法として、空気噴出口の口径、角度、空気流の強弱を、用紙の種類に合わせて変更可能に構成し、制御する方法がある（例えば、特許文献４参照。）。また、用紙の側面に空気噴出口を設置し、空気流の強弱を調整可能に構成し、用紙の種類に応じて強弱を制御する方法などもある（例えば、特許文献５参照。）。
【特許文献１】
特許第２９３４４４２号明細書
【特許文献２】
特開昭６３−８１３７号公報
【特許文献３】
特開２００２−２９８６後公報
【特許文献４】
特開平１０−６７４４２号公報
【特許文献５】
特開平１１−３４９１６５号公報
【０００９】
【発明が解決しようとする課題】
前記したように、近年の印刷物の多様化に伴ない、空気流を利用した給紙装置にはますます高い性能が求められるようになってきており、用紙の種類によっては、前記した空気噴出口の形状を工夫するだけでは十分な分離、浮上性能が得られない場合が出てきている。また、噴出口の口径や角度、空気流の強弱を用紙の種類によって制御する方法においては、装置や制御の複雑化が伴い、その製作コストも大きくなる傾向にある。
【００１０】
本発明の目的は、上記問題に鑑み、簡単な構成で効果的な用紙の分離、浮上性能が得られる給紙装置を提供することにあり、これにより、製作コストを抑えた空気式給紙装置を提供することを目的とする。
【００１１】
【課題を解決するための手段】
上記目的は、複数枚の用紙を収納可能な収納部材と、該収納部材に収納された前記用紙の搬送方向前面に位置し、且つ、前記用紙の概略中央部を挟んで両端側に配置された、空気を噴出する一対以上の第１噴出口と、前記用紙の概略中央部に位置し、空気を噴出する第２噴出口とを有し、前記第１噴出口及び第２噴出口から噴出される空気により分離、浮上された前記用紙を吸着、搬送するための搬送手段を備えた給紙装置において、前記第１噴出口からの空気流を、前記用紙の略中央部下方から、前記用紙の両端部で、且つ上方に向かって噴出させることによって達成される。
【００１２】
【発明の実施の形態】
以下、本発明の実施例について図面を参照して説明する。図３、図４は本発明による実施例を示す。図３、図４において、２は用紙、６は吸着ベルト、１２は用紙の上層部に向けて空気を噴出する第１噴出口１３と、吸着ベルト６に向けて空気を噴出する第２噴出口１４と、第１噴出口１３と同様に用紙２の上層部に向けて空気を噴出する補助噴出口１５から構成される真空充気室である。一般に噴出口はノズル、真空充気室はチャンバと呼ばれており、以下、噴出口はノズル、真空充気室はチャンバと呼ぶこととする。このチャンバ１２にはダクト１６を通して図示しない送風装置より空気流が供給される。１７は用紙２の搬送方向に対し、側面から空気を噴出する噴出口であり、チャンバ１２と同様に、図示しない送風装置から空気流が供給され、かつ、送風装置とこの噴出口１７の間には、切り替えバルブ１８が設置されていて、空気流の開閉が可能な構造となっている。この用紙側面に設けた噴出口１７を以下、側面ノズルと呼ぶ。また吸着ベルト６は吸引ダクト１９を通して吸引チャンバ２０の開口部に接して回転するように構成されており、吸着ベルト６の表面に明けた穴を介し、用紙２を吸着する仕組みになっている。
【００１３】
以上のように構成された給紙装置において、用紙２が給紙される動作について説明すると、まず、チャンバ１２の第１ノズル１３から噴出された空気流により、用紙２の上層部の用紙が互いに分離されながら浮上する。この状態で吸引ベルト６の穴が吸引チャンバ２０の開口部に位置し吸気が始まると、最上部の用紙、つまり１枚目の用紙が上昇を始め、これに伴い最上部以降の用紙も上昇を開始する。次に１枚目の用紙が吸引ベルト６に接近する過程において、第２ノズル１４からの空気流が吸引ベルト６に反射したのち、１枚目の用紙と２枚目の用紙の間に入り込み、１枚目の用紙と２枚目の用紙は完全に分離される。その後、吸着ベルト６に到着した１枚目の用紙は、吸着ベルト６の回転により搬送されていく。この時２枚目以降の用紙は第２ノズル１４からの空気により先端が下方向に押さえられているため、１枚目に引きずられて飛び出す現象、いわゆる連れ出しと呼ばれる現象は発生しない。この一連の給紙動作における要点の１つは、第１ノズル１３による用紙２の分離と浮上であり、浮上する個々の用紙と用紙の間に、適当な空隙が形成されない場合、１枚目の用紙が吸着ベルト６に吸着される過程において、第２ノズル１４からの空気が十分に流入せず、用紙２は１枚目と２枚目、場合によってはそれ以降の用紙と束になって上昇し、一緒に搬送される現象、いわゆる重送が発生することとなる。また、１枚目の用紙が搬送される際、第２ノズル１４による２枚目以降の用紙２に対する制動力が十分でないと連れ出しが発生してしまう。
【００１４】
本発明は、上記第１ノズル１３による用紙２の分離と浮上作用に着目し、ノズルの配置を工夫することで分離性能の向上をはかったものである。本発明は、この第１ノズル１３による用紙２の前面への空気の吹き付けが、用紙２の概略中央部の下方から、用紙の両端部の上方にかけて行われるよう、図４に示ように第１ノズル１３を傾けて上方広がりになるように配置した。これにより、空気流が当たる範囲の用紙２の形状は、図５に示すように、下方は中央部が上側に凸となる形状に湾曲し、上方は中央部が凹む方向に湾曲するため、垂直方向に第１ノズル１３を配置する図６の場合に比較して、用紙２の両端部は用紙どうしの間隔が大きい状態で浮上する。
【００１５】
また、図５に示すように、用紙２の中央部は用紙どうしの密着度が増すため用紙間の摩擦負荷が増加し、従って連れ出しの発生率が低減する。本実施例においては、図４に示すように、第１ノズル１３の両脇で、かつ、上方の位置に第３ノズル２１を設置し、第１ノズル１３によって形成された用紙両端部の空隙へ効果的に空気を流入させ、１枚目と２枚目の用紙の分離性をさらに向上させることによって重送防止効果を向上させている。但し、この第３ノズル２１の噴出する空気量は、第１ノズル１３の噴出する空気量より小さい必要があり、例えば、第３ノズル２１の噴出する空気量が第１ノズル１３の噴出する空気量を超える場合には、第１ノズル１３による用紙２の浮き上がりが阻害され、吸着ミスが発生する可能性が出てくる。
【００１６】
また、本実施例においては、図３、４に示すように、用紙２の側面方向から空気流を噴出するノズル１７を設置し、分離、浮上機能の向上を図ることも可能である。これは、第１ノズル１３により形成される用紙両端部の空隙に、効果的に空気を送り込むことができるためである。この側面から空気流を噴出する方法は、重くて分離、浮上が難しい厚紙や、用紙前面からの空気の吹き付けでは、空気が流入しにくく浮き上がり不足となりがちな下向きにカールした用紙を印刷する場合などに有効な手段である。但し、この側面から空気を吹き付ける場合、用紙の搬送方向に対し、横方向から力を作用させる性質上、トレーシングペーパのような薄い用紙の場合には用紙に「ばたつき」が生じ、姿勢が乱れる場合があるため、本実施例に示すように、切り替え弁１８を設け、用紙の種類によって切り替え制御を行う方が安定した給紙性能を得られる。さらに、幅方向に長い用紙を印刷する場合、図４に示すように、第１ノズル１３の外側に、用紙端部の浮上不足を補助するための補助ノズル１５を設置することも用紙２の浮上効果を向上させるのに有効である。
【００１７】
以上、説明した構成において、各ノズルの寸法については、各ノズルから用紙前面までの距離、空気流の吹き付け角度、空気流の速度、風量や各ノズルの相対位置により変化するものであり、また印刷しようとする用紙の種類によっても設定する数値が異なるため、一定値を示すことは困難であるが、本実施例においては、本方式の重要部位である第１ノズル１３、第２ノズル１４、第３ノズル２１について、第１ノズル１３は幅３ｍｍ、長さ１７ｍｍ、傾き角度４５°の長穴とし、第２ノズル１４は直径５ｍｍの円形穴とし、第３ノズル２１については直径４ｍｍの円形穴とした。この時、第１ノズル１３、第３ノズル２１から噴出される空気流帯は、積載された用紙２の上層部から下方４ｍｍ程度の範囲にぶつかるよう設定した場合、効果的な分離、浮上性能が得られた。
【００１８】
【発明の効果】
本発明によれば、簡単な構成で効果的な用紙の分離、浮上効果が得られる。このため、用紙の十分な分離、浮き上がり性能を目的として行われる、例えば空気噴出ノズルの口径、角度、空気流の強弱などを用紙の種類に合わせて制御する方法などを利用しなければならない場合が減少し、装置自体のコスト低減を図ることが可能となる。
【図面の簡単な説明】
【図１】従来技術における、空気流を利用した給紙装置の構造を示す図である。
【図２】従来技術における、空気流を利用した給紙装置の構造を示す断面図である。
【図３】本発明の実施例を示す、各空気噴出ノズルから噴出される空気流により、用紙が分離、浮上する様子を示す断面図である。
【図４】本発明の実施例を示す、各空気噴出ノズルの配置を示す正面図である。
【図５】本発明の実施例を示す、用紙上層部が空気噴出ノズルにより分離、浮上される様子を示す正面図である。
【図６】従来技術における、用紙上層部が空気噴出ノズルにより分離、浮上される様子を示す正面図である。
【符号の説明】
１は用紙昇降テーブル、２は用紙、３は用紙上面検出センサ、４は制御手段、５は真空充気室、６は吸着ベルト、７は駆動装置、８は空気噴出器、９は搬送ローラ、１０は主噴出口、１１は補助噴出口、１２は真空充気室（チャンバ）、１３は第１噴出口（第１ノズル）、１４は第２噴出口（第２ノズル）、１５は補助噴出口、１６はダクト、１７は側面ノズル、１８は切り替えバルブ、１９はダクト、２０は吸引チャンバ、２１は第３噴出口（第３ノズル）である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper feeding device for an electrophotographic apparatus, and more particularly to a paper feeding device using an air flow.
[0002]
[Prior art]
FIG. 1 shows the structure of a paper feeding device using an air flow, that is, a conventional paper feeding device of an electrophotographic apparatus generally called an air suction system or an air separation system. In FIG. 1, a sheet 2 stacked on a sheet lifting table 1 is always kept at a constant height by a sheet upper surface detection sensor 3 and a control unit 4 that controls the driving of the sheet lifting table 1 based on information from the sheet upper surface detection sensor 3. It is controlled to be located in Above the sheet 2, a vacuum charging chamber 5, a belt member having a suction hole generally called a suction belt 6, and a driving device 7 for driving the suction belt 6 are installed.
[0003]
An air ejector 8 for separating and floating the upper layer portion of the stacked paper by blowing an air flow is provided on the front surface in the paper transport direction. The air ejector 8 causes the air 2 to float. The suction belt 6 is sucked and transported to feed paper.
[0004]
Downstream of the paper conveyance direction, a so-called conveyance roller 9 which is a paper conveyance unit that receives the paper 2 to be sucked and conveyed and conveys it to an image forming unit (not shown) is provided.
[0005]
In the sheet feeding apparatus configured as described above, various devices have been conventionally made in order to obtain a sufficient sheet separation and floating effect by the above-described air blowing. For example, as shown in FIG. 2, the configuration of the air ejector 8 described above is configured such that air is blown horizontally or obliquely upward with respect to the sheet 2 to separate and float the upper layer sheet, and the adsorption Auxiliary jet outlet that blows air obliquely upward toward the belt 6 and separates the uppermost sheet and the lower sheet, that is, the first sheet and the second sheet, by the air flow reflected from the suction belt 6 11 is a method of ensuring a reliable separation and levitation effect by providing a plurality of independent outlets according to the role (see, for example, Patent Document 1).
[0006]
In addition to the paper separation and floating mechanism shown in the above example, there is an example in which the shape of the air outlet is devised in order to further improve the performance. In this example, the shape of the jet outlet corresponding to the main jet outlet for performing separation and levitation is a trapezoidal shape, and the spraying pressure is reduced from the bottom to the top of the stacked paper to improve the separation performance. This is devised so that multiple bundles reach the suction belt and do not cause double feeding (see, for example, Patent Document 2).
[0007]
Furthermore, as another example of devising the shape of the air outlet, the above-mentioned shape of the air outlet is an “H” shape, or a combination of other geometric shapes, and the paper is separated and floated by the air flow. Is arbitrarily changed in the vertical direction of the paper (for example, see Patent Document 3). This example can be said to be an advanced type of the above-mentioned Patent Document 2.
[0008]
Coated paper with high glossiness and high paper smoothness, thin paper such as tracing paper, and paper such as OHP with the recent color printing and diversification of printed matter in the electrophotographic industry As a method to further improve separation and flying performance in order to cope with printing on paper, there is a method of configuring and controlling the diameter, angle, and strength of the air flow according to the type of paper so that it can be changed. (For example, refer to Patent Document 4). Further, there is a method in which an air outlet is provided on the side surface of the paper so that the strength of the air flow can be adjusted, and the strength is controlled according to the type of the paper (for example, see Patent Document 5).
[Patent Document 1]
Patent No. 2934442 [Patent Document 2]
JP 63-8137 A [Patent Document 3]
Japanese Patent Laid-Open No. 2002-2986 [Patent Document 4]
JP-A-10-67442 [Patent Document 5]
Japanese Patent Laid-Open No. 11-349165
[Problems to be solved by the invention]
As described above, along with the recent diversification of printed matter, paper feeders using airflow are increasingly required to have high performance. Depending on the type of paper, the above-mentioned air outlet There are cases where sufficient separation and levitation performance cannot be obtained simply by devising the shape of the above. Further, in the method of controlling the diameter and angle of the jet nozzle and the strength of the air flow according to the type of paper, the apparatus and control become complicated, and the manufacturing cost tends to increase.
[0010]
SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a paper feeding device that can obtain effective paper separation and flying performance with a simple configuration, thereby reducing the manufacturing cost. The purpose is to provide.
[0011]
[Means for Solving the Problems]
The object is to be disposed at both ends of the storage member that can store a plurality of sheets, and located in front of the sheet stored in the storage member in the transport direction, with the central portion of the sheet interposed therebetween. A pair of one or more first outlets for ejecting air, and a second outlet for ejecting air, which is located at a substantially central portion of the paper, and is ejected from the first and second outlets. In the paper feeding device having a conveying means for adsorbing and conveying the paper separated and floated by the air, the air flow from the first ejection port is caused to flow from the lower part of the central part of the paper. It is achieved by ejecting at both ends and upward.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 3 and 4 show an embodiment according to the present invention. 3 and 4, 2 is a sheet, 6 is an adsorption belt, 12 is a first ejection port 13 that ejects air toward the upper layer of the sheet, and a second ejection port that ejects air toward the adsorption belt 6. 14 and a vacuum charging chamber composed of an auxiliary jet port 15 that jets air toward the upper layer of the sheet 2 in the same manner as the first jet port 13. In general, the ejection port is referred to as a nozzle and the vacuum charging chamber is referred to as a chamber. Hereinafter, the ejection port is referred to as a nozzle, and the vacuum charging chamber is referred to as a chamber. An air flow is supplied to the chamber 12 from a blower (not shown) through a duct 16. Reference numeral 17 denotes a jet outlet for jetting air from the side surface with respect to the conveyance direction of the paper 2. Similarly to the chamber 12, an air flow is supplied from a blower (not shown), and between the blower and the jet outlet 17. The switching valve 18 is installed, and the air flow can be opened and closed. The jet port 17 provided on the side surface of the sheet is hereinafter referred to as a side nozzle. Further, the suction belt 6 is configured to rotate in contact with the opening of the suction chamber 20 through the suction duct 19, and is configured to suck the paper 2 through a hole formed in the surface of the suction belt 6.
[0013]
The operation of feeding the sheet 2 in the sheet feeding device configured as described above will be described. First, the upper layer sheets of the sheet 2 are mutually connected by the air flow ejected from the first nozzle 13 of the chamber 12. Ascends while separating. In this state, when the hole of the suction belt 6 is located at the opening of the suction chamber 20 and the suction starts, the uppermost sheet, that is, the first sheet starts to rise, and the uppermost sheet and so on rise accordingly. Start. Next, in the process in which the first sheet approaches the suction belt 6, the air flow from the second nozzle 14 is reflected on the suction belt 6, and then enters between the first sheet and the second sheet. The first sheet and the second sheet are completely separated. Thereafter, the first sheet that has arrived at the suction belt 6 is conveyed by the rotation of the suction belt 6. At this time, since the leading edge of the second and subsequent sheets is pressed downward by the air from the second nozzle 14, a phenomenon called so-called take-out does not occur. One of the important points in this series of sheet feeding operations is separation and floating of the sheet 2 by the first nozzle 13. If an appropriate gap is not formed between the individual sheets that float, the first sheet In the process of adsorbing the sheet to the adsorption belt 6, the air from the second nozzle 14 does not sufficiently flow in, and the sheet 2 rises as a bundle with the first sheet and the second sheet, and possibly the subsequent sheets. In addition, a phenomenon of being conveyed together, so-called double feeding, occurs. Further, when the first sheet is conveyed, if the braking force for the second and subsequent sheets 2 by the second nozzle 14 is not sufficient, take-out occurs.
[0014]
In the present invention, focusing on the separation and floating action of the paper 2 by the first nozzle 13, the separation performance is improved by devising the arrangement of the nozzles. In the present invention, as shown in FIG. 4, the first nozzle 13 blows air to the front surface of the sheet 2 from below the substantially central portion of the sheet 2 to above both ends of the sheet. The nozzle 13 was tilted and arranged so as to spread upward. As a result, as shown in FIG. 5, the shape of the sheet 2 in the range where the airflow strikes is vertical because the lower part is curved in a shape in which the central part is convex upward and the upper part is curved in the direction in which the central part is recessed. Compared with the case of FIG. 6 in which the first nozzles 13 are arranged in the direction, both end portions of the sheet 2 are floated in a state in which the distance between the sheets is large.
[0015]
In addition, as shown in FIG. 5, since the close contact between the sheets increases at the center of the sheet 2, the friction load between the sheets increases, and therefore the occurrence rate of take-out decreases. In the present embodiment, as shown in FIG. 4, the third nozzle 21 is installed on both sides of the first nozzle 13 and at an upper position, and into the gaps at both ends of the paper formed by the first nozzle 13. The effect of preventing double feeding is improved by effectively flowing air and further improving the separation between the first and second sheets. However, the amount of air ejected by the third nozzle 21 needs to be smaller than the amount of air ejected by the first nozzle 13. For example, the amount of air ejected by the third nozzle 21 is the amount of air ejected by the first nozzle 13. In the case of exceeding 1, the floating of the paper 2 by the first nozzle 13 is hindered, and there is a possibility that a suction error will occur.
[0016]
Further, in this embodiment, as shown in FIGS. 3 and 4, it is possible to install a nozzle 17 for ejecting an air flow from the side surface direction of the paper 2 to improve the separation and floating functions. This is because air can be effectively fed into the gaps at both ends of the paper formed by the first nozzle 13. This method of jetting airflow from this side is used for printing heavy paper that is heavy and difficult to separate and float, or when printing curled paper that tends to be insufficiently lifted when air is blown from the front of the paper. It is an effective means. However, when air is blown from this side, due to the property that the force is applied from the lateral direction to the paper transport direction, in the case of thin paper such as tracing paper, the paper "flutters" and the posture is disturbed. Therefore, as shown in the present embodiment, it is possible to obtain a stable paper feeding performance by providing the switching valve 18 and performing switching control depending on the type of paper. Further, when printing a sheet that is long in the width direction, as shown in FIG. 4, an auxiliary nozzle 15 for assisting in insufficient floating of the end of the sheet may be installed outside the first nozzle 13. It is effective to improve the effect.
[0017]
In the configuration described above, the size of each nozzle varies depending on the distance from each nozzle to the front surface of the paper, the airflow blowing angle, the airflow speed, the airflow, and the relative position of each nozzle, and printing. Since the numerical value to be set differs depending on the type of paper to be used, it is difficult to indicate a constant value. However, in this embodiment, the first nozzle 13, the second nozzle 14, For the three nozzles 21, the first nozzle 13 is a long hole having a width of 3 mm, a length of 17 mm, and an inclination angle of 45 °, the second nozzle 14 is a circular hole having a diameter of 5 mm, and the third nozzle 21 is a circular hole having a diameter of 4 mm. did. At this time, when the air flow bands ejected from the first nozzle 13 and the third nozzle 21 are set so as to collide with a range of about 4 mm downward from the upper layer portion of the stacked sheets 2, effective separation and flying performance is achieved. Obtained.
[0018]
【The invention's effect】
According to the present invention, an effective sheet separation and floating effect can be obtained with a simple configuration. For this reason, there are cases where it is necessary to use a method of controlling the size, angle, air flow strength, etc. of the air ejection nozzle according to the type of paper, which is performed for the purpose of sufficient separation and lifting performance of the paper. This reduces the cost of the device itself.
[Brief description of the drawings]
FIG. 1 is a diagram showing a structure of a paper feeding device using an air flow in the prior art.
FIG. 2 is a cross-sectional view showing a structure of a paper feeding device using an air flow in the prior art.
FIG. 3 is a cross-sectional view illustrating a state where a sheet is separated and floated by an air flow ejected from each air ejection nozzle according to an embodiment of the present invention.
FIG. 4 is a front view showing the arrangement of air ejection nozzles according to an embodiment of the present invention.
FIG. 5 is a front view illustrating an embodiment of the present invention, in which a sheet upper layer is separated and floated by an air ejection nozzle.
FIG. 6 is a front view showing a state in which a paper upper layer portion is separated and floated by an air ejection nozzle in the prior art.
[Explanation of symbols]
1 is a paper lifting table, 2 is paper, 3 is a paper upper surface detection sensor, 4 is a control means, 5 is a vacuum charging chamber, 6 is a suction belt, 7 is a driving device, 8 is an air ejector, 9 is a transport roller, 10 is a main jet, 11 is an auxiliary jet, 12 is a vacuum charging chamber (chamber), 13 is a first jet (first nozzle), 14 is a second jet (second nozzle), and 15 is an auxiliary jet. An outlet, 16 is a duct, 17 is a side nozzle, 18 is a switching valve, 19 is a duct, 20 is a suction chamber, and 21 is a third jet outlet (third nozzle).

Claims

A storage member capable of storing a plurality of sheets of paper, and an air jet which is located on the front side in the transport direction of the paper stored in the storage member and is disposed on both sides with the approximate center portion of the paper interposed therebetween A pair of or more first jet outlets and a second jet outlet that is located at a substantially central portion of the paper and ejects air, and is separated by air ejected from the first jet outlet and the second jet outlet. In the sheet feeding device provided with a conveying means for sucking and conveying the floated paper, the air flow from the first jet port is passed from substantially below the central portion of the paper to both ends of the paper. And a paper feeding device which ejects upward.

A storage member capable of storing a plurality of sheets of paper, and an air jet which is located on the front side in the transport direction of the paper stored in the storage member and is disposed on both sides with the approximate center portion of the paper interposed therebetween A pair of or more first jet outlets and a second jet outlet that is located at a substantially central portion of the paper and ejects air, and is separated by air ejected from the first jet outlet and the second jet outlet. In the sheet feeding device provided with a conveying means for sucking and conveying the floated paper, the air flow from the first jet port is passed from substantially below the central portion of the paper to both ends of the paper. In addition, a third jet outlet is provided in the vicinity of the first jet outlet for jetting an air amount smaller than the amount of air jetted from the first jet outlet, and the third jet outlet is disposed. The height is equal to or higher than the first outlet. Sheet feeder to.

A storage member capable of storing a plurality of sheets of paper, and an air jet which is located on the front side in the transport direction of the paper stored in the storage member and is disposed on both sides with the approximate center portion of the paper interposed therebetween A pair of or more first jet outlets and a second jet outlet that is located at a substantially central portion of the paper and ejects air, and is separated by air ejected from the first jet outlet and the second jet outlet. In the sheet feeding device provided with a conveying means for sucking and conveying the floated paper, the air flow from the first jet port is passed from substantially below the central portion of the paper to both ends of the paper. In addition, the paper feeding device is characterized in that a jetting outlet is provided which is ejected upward and is located in a side surface direction with respect to the conveyance direction of the paper and ejects air on the side surface of the paper.

A storage member capable of storing a plurality of sheets of paper, and an air jet which is located on the front side in the transport direction of the paper stored in the storage member and is disposed on both sides with the approximate center portion of the paper interposed therebetween A pair of or more first jet outlets and a second jet outlet that is located at a substantially central portion of the paper and ejects air, and is separated by air ejected from the first jet outlet and the second jet outlet. In the sheet feeding device provided with a conveying means for sucking and conveying the floated paper, the air flow from the first jet port is passed from substantially below the central portion of the paper to both ends of the paper. In addition, the air is ejected upward, and an air amount smaller than the amount of air ejected from the first ejection port is ejected in the vicinity of the first ejection port, and the arrangement height of the ejection port is the first ejection port. A third jet outlet that is equivalent to or above the Paper feeding device located laterally to the direction, characterized in that a spout for spouting air to the side of the paper.