JP4488638B2 - Paper sheet take-out device - Google Patents

Description

図15は、リバースモータ６４によって与えられる逆転トルクを示すグラフである。
【００６６】
このグラフは横軸に逆転ローラ３１の押圧力N、縦軸に逆転トルクTをとったもので、直線は
式 Ｔ=μｇ・N・ｒを表している。
【００６７】
従って、逆転ローラ３１が連れ回る条件は、この直線の下の領域である。
【００６８】
MRR取り出しでは、押圧力Nと逆転トルクTの組み合わせは、連れ回りの条件からは、直線の下の領域ということになる。この領域では、上記のように原理的には逆転ローラ３１は取出ローラ３０の速度で連れ回るはずだが、実際にはこれより遅く回転する。
【００６９】
滑り速度は、連れ回りの速度Voの大きさにもよるが、安定した取り出しを与える正常な場合は、Voの約20%以下である。直線より上の領域は、リバースモータ６４のトルクTが、μg・N・ｒに打ち勝って、逆転ローラ３１を駆動するので、逆転方向に加速されて、滑り速度は、原理的には無限大になって逆転するはずであるが、実際にはある値にとどまる。
【００７０】
図中の破線は滑り速度の割合(Vo一V)/Voを模式的に表したもので、直線付近では滑り速度が小さいが、直線から離れると、大きくなっていく。
【００７１】
ちなみに滑り速度の割合が1というのはV=0の時で逆転ローラ３１の回転は停止している。滑り速度の割合が1を超えると、Vは負の値になるので、逆転方向、つまりリバースモータ６４の回転方向に逆転ローラ３１が回転することを示している。
【００７２】
ところで、摩擦係数μｇが低下すると、この直線の傾きが小さくなる。図中丸印のように、あるTとNの組み合わせで設定されていて正常な連れ回りによって安定した取出しが実現できていても、摩擦係数μｇが低下して直線が一点鎖線のように傾きが減れば、丸印は連れ回り領域から外れ、通常より大きな滑り速度で連れ回ることになる。逆に、滑り速度、即ち、逆転ローラの速度を観察すれば、摩擦係数μgの減少を検知できる。
【００７３】
図１６は取出ローラ３０と逆転ローラ３１との間の摩擦係数を測定するための測定装置を示すブロック図である。
【００７４】
上記した検出手段９５は信号路を介して測定手段９７に接続され、測定手段９７は送信回路を介してコントローラ８５に接続されている。
【００７５】
測定手段９７は検出手段９５により検出された逆転ローラ３１の回転速度から取出ローラ３０と逆転ローラ３１との間の滑り速度を検出してローラ３０，３１間の摩擦係数を測定するようになっている。この測定手段９７により測定された摩擦係数は送信回路を介してコントローラ８５に送信され、コントローラ８５はこの摩擦係数の大きさに応じて後で詳しく述べるように各種の制御を行うようになっている。
【００７６】
図１７は取出ローラ３０と逆転ローラ３１との間の摩擦係数の測定動作を示すフローチャートである。
【００７７】
まず、取出ローラ３０と逆転ローラ３１との間に紙幣Ｐがない状態で、逆転ローラ３１を駆動し（ステップＳＴ１）、ついで、取出ローラ３０を駆動する（ステップＳＴ２）。このとき、逆転ローラ３１には紙幣の取出動作時に用いられる所定の逆転トルクＴが付与されている。ついで、検出手段９５により逆転ローラ３１の回転速度を検出し、この検出した回転速度に基づいて測定手段９７によりローラ３０，３１間の滑り速度を検出してその摩擦係数を測定する。この測定された摩擦係数はコントローラ８５に送信され、所定の値と比較される。即ち、ここでは、滑り速度の割合を1、0.5、0.25の3つの値で3段階で比較している。まず、滑り速度の割合が1以上であるか否かが判別され（ステップＳＴ３）、滑り速度の割合が1以上であると判別された場合は、逆転ローラ３１が逆転する状態で摩擦係数がかなり減少しているか、或は、押圧が別の理由で減少していることなどが考えられ、安定した取り出しが望めない。このときは、異常と判断してエラーとし、警告を与えたのち機器の動作を停止する（ステップＳＴ４）。
【００７８】
また、滑り速度の割合が1以上ではないと判別された場合には、滑り速度の割合が1より小さいく0.5より大きいか否かが判別される（ステップＳＴ５）。割合が大きいと判別された場合には、摩擦係数の比較的大きな低下と判断して、アラームを立て（ステップＳＴ６）、オペレータや保守員にローラ清掃などの処置が必要であることを知らせる。大きくないと判別された場合には、滑り速度の割合がO.5より小さいく0.25より大きか否かが判別される（ステップＳＴ７）。割合が大きいと判別された場合には、少しの摩擦係数低下と判断して、あとで述べる方法で、自動でクリーニングを行う（ステップＳＴ８）。大きくないと判別された場合には、逆転ローラ３１及び取出ローラ３０の回転が停止され（ステップＳＴ９）、測定が停止される。
【００７９】
なお、クリーニング動作終了後には、滑り速度の確認ができるようなループになっていて、正常と思われる範囲の0.25以下で測定の終了になる。
【００８０】
また、自動のクリーニングは、ローラ３０，３１の汚れなどによる比較的初期の摩察係数の低下を検知してこれを復帰させようとするもので、この一連の動作を定期的に行っていれば、安定した取出しを維侍することができる。
【００８１】
また、この摩擦係数測定動作は、例えば、オペレータや保守員が、任意のときに手動モードで行うようにしてもよいし、動作時間や、券の処理枚数を監視して一定時期ごとに行ってもよい。この場合，取出動作で紙幣の取出し動作を終わった時点でのローラ３０，３１の空回転を利用して行うと特別な動作をしているように見えないので、安全上からもよい。
【００８２】
次に、取出ローラ３０及び逆転ローラ３１の自動クリーニングについて説明する。
【００８３】
紙幣の取出しを行っていると、ローラ３０，３１の表面に、汚れなどの付着物がついて摩擦係数を低下させる。この摩擦係数の低下は分離能力の低下につながり安定した取出しができなくなる。自動クリーニングはこのようなとき人手を介さずに行うためと、より大きな摩擦係数の低下を招く前に事前にきめ細かなメンテナンスを与えるものである。
【００８４】
ローラ同士を接触させて速度差を持たせて駆動させるとお互いに擦り合って表面の付着物を除去する効果がある。この動作はローラ全周にわたって均一に行われるため、ローラの一部を削って変心させるなどの弊害がない。ローラ間の圧接力や速度差、或は汚れ等にもよるが、一般に1〜2秒といった短い時間の運転で摩擦係数の回復が可能となる。
【００８５】
図１８は自動ローラクリーニングの動作を示すフローチャートである。
【００８６】
まず、逆転ローラ３１を駆動させ（ステップＳＴ１１）、ついで、取出モータ４１を低速で駆動する（ステップＳＴ１２）。これにより、逆転ローラ３１と取出ローラ３０とが速度差を有して回転し、互いに擦り合ってその表面のクリーニングが行われる。このとき、取出ローラ４１は取出し速度で回転する必要がないので低速で駆動させる。
【００８７】
ついで、逆転ローラ３１に付与する逆転トルクを、通常の取出動作時でのトルクより大きなトルクT4とし（ステップＳＴ１３）、ローラ３０，３１間の擦り力を大きくしてクリーニング効果を出すようにする。こののち、所定時間（１〜2秒程度）が経過したか否かが判別され（ステップＳＴ１４）、所定時間が経過したと判別されると、逆転ローラ３１及び取出ローラ３０の回転が停止され（ステップＳＴ１５）、クリーニング動作を終了する。
【００８８】
なお、互いのローラが擦れ合うと接触点の温度が高く、ゴム材質が異なると反応して弊害が起きることがある。MRR取出しは、ゲートローラ方式の取り出しのように分離部のローラに摩擦係数を変えた組み合わせをする必要がないため、比較的摩擦係数の高い同じゴム材質を取出ローラ３０と逆転ローラ３１に使用することができるため、上記したような問題が起きない。
【００８９】
また、同じゴム材質の場合、双方が同じように青掃され、効率よく清掃されることもメリットになる。
【００９０】
さらに、このクリーニング方法はここで述べたように、摩擦係数測定動作の中で行って、自動クリーニングとして用いてもよいが、もちろん独立した動作として、オペレータや保守員がマニュアル動作でクリーニングを行ってもよい。
【００９１】
また、この発明では、ローラ３０，３１間の摩擦係数が低下した場合には、逆転ローラ３１に付与する逆転トルクの大きさを低下させるようにしている。
【００９２】
図１５で説明したように、ローラ３０，３１間の摩擦係数が低下すると、直線の傾きが小さくなる。図中丸印のように、あるTとNの組み合わせで設定されていて正常な連れ回りによって安定した取出しが実現できていても、摩擦係数μｇが低下して直線が一点鎖線のように傾きが減れば、丸印は連れ回り領域から外れ、通常より大きな滑り速度で連れ回ることになる。
【００９３】
従って、ローラ３０，３１間の摩擦係数が低下した場合には、逆転ローラ３１に付与する逆転トルクの大きさを低下させれば、丸印は一点鎖線で示す直線の下の領域に位置して連れ回りが可能となり、良好な取り出しが可能となる。
【００９４】
上記したように、ローラ３０，３１の摩擦係数を測定し、この摩擦係数が低下したことをことに基づいて自動的にクリーニングをして摩擦係数を復活させるため、安定した取出しが実現できる。
【００９５】
また、摩擦係数の変化を客観的に捉えることができるため、クリーニングの可否や、その時期を正確に判断することができる。
【００９６】
さらに、特別な操作を必要とすることなく、取出動作の中でインプロセスに自動でローラの清掃を行うことができる。
【００９７】
また、汚れが少ないうちにこまめに清掃することが可能なので、取出性能の低下を招くことなく、安定した取出しを実現できる。
【００９８】
また、摩擦測定によって清掃の仕上がり程度の確認ができるため、安定した清掃が可能となる。
【００９９】
【発明の効果】
本発明は以上説明したように、分離ローラの回転速度を検出し、この検出した回転速度に基づいて前記取出ローラと分離ローラとの間の滑り速度を検出して両ローラ間の摩擦係数を測定するから、両ローラ間の摩擦係数の低下を人の感覚によって判断する場合と比較して摩擦係数の低下を客観的に精度良く判別できる。従って、最適なタイミングでの清掃が可能となり、良好な分離性能を維持できる。
【０１００】
また、清掃の仕上がり程度の確認も摩擦係数の測定により確認できるため、清掃状態にばらつきを生じることがなく、良好な清掃が可能なる。
【０１０１】
また、取出ローラと分離ローラを接触させた状態で速度差を持たせて回転させることにより、互いに擦り合わせて清掃するから、人手により清掃する場合と比較して清掃作業が容易になる。
【０１０２】
さらに、装置の取出動作中に摩擦係数を測定するとともに、ローラの清掃を行うことができ、装置の稼動効率を良好に維持できる。
【０１０３】
また、測定手段によって測定される摩擦係数の大きさに応じて分離ローラに付与する逆転トルクの大きさを可変制御するため、摩擦係数が低下しても紙葉類の取り出しを良好に維持することができる。
【図面の簡単な説明】
【図１】本発明の一実施の形態である紙幣の分類処理機を示す概略的構成図。
【図２】紙幣の分離機構を示す斜視図。
【図３】分離機構を構成する取出ローラ及び逆転ローラの回転状態を示す図。
【図４】取出ローラと逆転ローラとの間に紙幣が１枚送り込まれた状態を示す図。
【図５】取出ローラと逆転ローラとの間に紙幣が２枚送り込まれた状態を示す図。
【図６】取出ローラと逆転ローラとの間に送り込まれた紙幣が分離された状態を示す図。
【図７】紙幣の分離機構を構成する各ローラの配置構成を示す正面図。
【図８】紙幣の分離機構を構成する各ローラの配置構成を示す側面図。
【図９】取出ローラと逆転ローラの当接状態を示す正面図。
【図１０】取出ローラと逆転ローラの当接状態を示す側面図。
【図１１】逆転ローラの回転速度を検出するためのディスクを示す正面図。
【図１２】第１及び第２のフォトインタラプタの逆回転時の検出信号を示す図。
【図１３】第１及び第２のフォトインタラプタの正回転時の検出信号を示す図。
【図１４】取出ローラと逆転ローラの接触回転動作を示す図。
【図１５】逆転ローラに付与する逆転トルクと押圧力との関係を示すグラフ図。
【図１６】取出ローラと逆転ローラとの間の摩擦係数を測定するための測定系を示すブロック図。
【図１７】取出ローラと逆転ローラとの間の摩擦係数の測定動作を示すフローチャート図。
【図１８】取出ローラと逆転ローラのクリーニング動作を示すフローチャート図。
【符号の説明】
Ｐ…紙葉類、３０…取出ローラ、３１…逆転ローラ（分離ローラ）、６４…リバースモータ（トルク付与手段）、８５…コントローラ（制御手段）、９５…検出手段、９７…測定手段。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper sheet takeout device that separates and takes out stacked paper sheets, for example, banknotes one by one.
[0002]
[Prior art]
As this type of paper sheet take-out device, a device for separating and taking out banknotes by frictional force such as a rubber roller is frequently used.
[0003]
For removing the banknote, the frictional force of the rubber roller is used to give a feeding force to the banknote or to apply a separating braking force to the second and subsequent banknotes. These feed force and brake force are required to have a predetermined magnitude and to maintain a predetermined ratio for stable takeout.
[0004]
This take-out device includes a gate roller type in which the gate roller is opposed to the take-out roller with a gap or a pressure roller type in which the pressure roller is in pressure contact with the take-out roller because of the structure of the separating portion. .
[0005]
Both the gate roller system and the pressure roller system are required to give an appropriate coefficient of friction to a gate roller or a pressure roller (hereinafter referred to as a separation roller) that applies a separation force to a bill. That is, the friction coefficient between the separation roller and the banknote should be medium, smaller than that of the take-out roller and banknote, and larger than that of the banknote and banknote.
[0006]
In addition, when the friction coefficient changes due to wear or secular change of the separation roller, the friction force between the separation roller and the banknote is smaller than the frictional friction force between the banknotes generated in the separation unit, which affects the separation force. There is.
[0007]
In the case of printed matter such as banknotes, the ink on the surface may be transferred to the surface of the separation roller little by little, and the friction coefficient of the separation roller may be lowered. Depending on the printing, starch powder or the like is sprinkled to dry the ink, so that the starch powder or the like may adhere to the surface of the separation roller and the friction coefficient may be drastically reduced.
[0008]
In addition, since bills and the like are handled by an unspecified number of people, various dirt components such as hand dust may adhere to the surface of the separation roller or migrate from the surface of the separation roller to change the surface properties. At this time, the friction coefficient is also reduced.
[0009]
Such a phenomenon can be dealt with by cleaning the separation roller. Unless the surface of the separation roller changes or wears over a long period of time, the coefficient of friction often returns to its original value by simply cleaning the surface.
[0010]
[Problems to be solved by the invention]
However, in the past, since the decrease in the friction coefficient of the separation roller was determined by human sensation, the determination varies from person to person.
[0011]
For this reason, there is an inconvenience that an appropriate cleaning timing is missed, an unsatisfactory take-out occurs, and dirt adheres so much that the separation roller cannot be returned to its original state even after chemical cleaning.
[0012]
In addition, since the degree to which the separation roller needs to be cleaned is also sensed, the cleaning finish varies.
[0013]
Furthermore, since the separation roller is manually cleaned, workability is poor and time is required. In particular, since many parts are in the vicinity of the separation roller, it takes time to clean the separation roller.
[0014]
The present invention has been made by paying attention to the above circumstances, and it is possible to objectively measure the decrease in the coefficient of friction between the take-out roller and the separation roller without depending on human senses, and to clean the take-out roller and the separation roller. An object of the present invention is to provide a paper sheet take-out device that can be automatically cleaned without being manually handled.
[0015]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the claim 1 invention Is By rotating A take-out roller for taking out paper sheets, and this take-out roller Through the paper sheets A separation roller that separates the paper sheets that are pressed and taken out by the take-out roller, one by one; Torque applying means for applying a rotational torque that generates a force in a direction opposite to a tangential force generated when the paper sheet is taken out by the take-out roller to the separation roller, and a paper sheet between the take-out roller and the separation roller Rotate without Detecting means for detecting the rotational speed of the separating roller, and detecting the sliding speed between the take-out roller and the separating roller based on the rotational speed detected by the detecting means to measure the friction coefficient between the two rollers. Measuring means to Control means for cleaning the surface of the take-out roller and the separation roller by rubbing each other by rotation based on the fact that the measuring means has measured a predetermined coefficient of friction; It comprises.
[0017]
Claim 2 Described invention Is By rotating A take-out roller for taking out paper sheets, and this take-out roller Through the paper sheets A separation roller that separates the paper sheets that are pressed and taken out by the take-out roller, one by one; Torque applying means for applying a rotational torque that generates a force in a direction opposite to a tangential force generated when the paper sheet is taken out by the take-out roller to the separation roller, and a paper sheet between the take-out roller and the separation roller Rotate without A detecting means for detecting the rotation speed of the separation roller, and a slip speed between the take-out roller and the separation roller is detected based on the rotation speed of the separation roller detected by the detection means. Measuring means for measuring the friction coefficient, and the take-out roller and the separation roller based on the fact that the measuring means has measured a predetermined friction coefficient Both sides With a speed difference Respectively And a control means for cleaning the surface by rubbing each other by rotating.
[0018]
Claim 3 The described invention By rotating A take-out roller for taking out paper sheets, and this take-out roller Through the paper sheets A separation roller that separates the paper sheets that are pressed and taken out by the take-out roller one by one; Rotational torque that generates a force in the direction opposite to the tangential force generated when the take-out roller takes out the paper sheet Torque applying means for applying Rotates with no paper sheets between the take-out roller and separation roller Detecting means for detecting the rotational speed of the separating roller, and detecting the sliding speed between the take-out roller and the separating roller based on the rotational speed detected by the detecting means to measure the friction coefficient between the two rollers. Measuring means to Based on the fact that this measuring means has measured a predetermined coefficient of friction, the take-out roller and the separation roller are rubbed against each other by rotation, and the surface is cleaned. Control means for variably controlling the magnitude of the rotational torque applied to the separation roller according to the magnitude of the friction coefficient measured by the measuring means.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
[0020]
FIG. 1 is an internal configuration diagram showing a banknote sorting and sorting machine according to an embodiment of the present invention.
[0021]
In the figure, reference numeral 1 denotes a housing. A table portion 1A is provided at a central portion on one side of the housing 1, and a bill supply portion 2 is provided on the table portion 1A. The banknote supply unit 2 stores a plurality of banknotes P as paper sheets in a standing state. This bill P is pressed against a pickup roller 5 as a delivery roller by a backup plate 4 as a pushing means biased by a spring 3. The bill P is sent out downward by the rotation of the pickup roller 5. A separation unit 32 and a conveyance unit 37 (shown in FIG. 2) constituting a paper sheet take-out device, which will be described in detail later, are disposed below the pickup roller 5.
[0022]
The banknotes P carried out from the transport unit 37 are transported by a clamp-type transport means H constituted by the belt 6 and the rollers 7. The conveying means H is provided with a posture correcting device 8 that automatically corrects the shift and skew of the bills P taken out. A determination unit 9 as a determination unit is provided downstream of the conveyance unit H in the bill conveyance direction. The determination unit 9 reads various information from the surface of the banknote P conveyed by the roller pair 10, performs a logical operation on the information, and compares it with the reference information to obtain dirt, damage, amount, top and bottom, front and back These four directions are discriminated.
[0023]
A first branch device 11 as a switching unit is provided on the downstream side of the determination unit 9 in the banknote conveyance direction. The first branching device 11 takes the two pieces that have not been determined to be the correct banknotes P, such as two sheets taken by the determination unit 9 or a large skiing bill of a certain level or more, to the reject box 12 and is determined to be the correct banknotes P. Is guided to the second branching device 13 as a switching means.
[0024]
The 2nd branching device 13 divides the conveyance direction of the banknote P into the 1st and 2nd direction. A left-right reversing path 14 is provided in the first direction, and the left-right reversing path 14 has a velvet belt 15 that reverses the banknote P 180 degrees left and right. A simple belt conveyance unit 16 is provided in the second direction, and the banknotes P are conveyed as they are. The banknotes branched and conveyed in the first and second directions merge at the merge section 17. The path lengths to the merging portion 17 are made equal so that the interval after the banknote merging is not displaced.
[0025]
A third branching device 18 serving as a switching unit is provided on the downstream side of the merge portion 17 in the bill conveyance direction, and the conveyance direction of the bills P is branched into third and fourth directions by the third branching device 18. . A switchback path unit 19 is provided in the third direction. The switchback path 19 is provided with a reversing box 20 for introducing the banknote P, and a rotary wheel 21 for pressing the rear end of the banknote P guided to the reversing box 20 against the reversing roller 21a. The banknotes P are fed out of the reversing box 20 so that their top and bottom are reversed and conveyed. A simple belt conveyance unit 22 is provided in the fourth direction, and the bills P are conveyed while maintaining the same posture. The banknotes branched and conveyed in the third and fourth directions merge at the merge section 23. The path lengths of the branch paths to the merging portion 23 are made equal so that the interval after the merging is not shifted.
[0026]
A horizontal transport path 24 is provided on the downstream side of the merge section 23 in the banknote transport direction. The horizontal transport path 24 includes one branching device 25a to 25d, which is one less than the number of portions to be divided. Below these branching devices 25a to 25d, first to fourth type-specific pocket portions 26a to 26 are disposed as stacking portions, and banknotes P are stacked horizontally in these type-specific pocket portions 26a to 26. It is to be accumulated.
[0027]
A 100-sheet sealing device 27 is provided below the first branch device 25a. The 100-sheet sealing device 27 includes a stacking unit 28 that stacks and sorts 100 banknotes P, a transport unit 28a that transports banknotes P from the stacking unit 28, and a banknote P that is transported by the transport unit 28a. Has a belt winding part 29 for binding the paper with a paper belt 29a.
[0028]
FIG. 2 is a block diagram showing a banknote take-out device as a paper sheet take-out device.
[0029]
This banknote take-out device is constituted by the pickup rollers 5 and 5, the separation unit 32 and the conveyance unit 37 described above, and the pickup rollers 5 and 5, the separation unit 32 and the conveyance unit 37 are arranged along the vertical direction.
[0030]
The separation unit 32 includes take-out rollers 30 and 30, and reverse rotation rollers 31 and 31 as separation rollers are pressed against the take-out rollers 30 and 30. The transport unit 37 is provided below the take-out rollers 30 and 30 and includes drive rollers 34 and 34, and pinch rollers 35 and 35 are in rolling contact with the drive rollers 34 and 34. The bills P are pulled out and conveyed by the drive rollers 34 and 34 and the pinch rollers 35 and 35. The pickup roller 5, the take-out roller 30, the reverse rotation roller 31, the drive roller 34, and the pinch roller 35 are arranged one by one on the left and right sides, and take out the banknote P along the short direction.
[0031]
A peripheral surface of the take-out roller 30 of the separation unit 32 is formed of rubber and is attached to the shaft 36 via a one-way clutch 30a. The take-out roller 30 can rotate freely in the take-out direction of the banknote P, and is designed to reduce resistance when the banknote P is pulled out by the drive roller 34 and the pinch roller 35. The shaft 36 is attached to the frame 39 via a bearing 38. An extraction motor 41 is connected to one end of the shaft 36 via a pulley 40a, a timing belt 40b, and a pulley 40c.
[0032]
In this embodiment, the one-way clutch 30a is provided on the take-out roller 30, but the take-off roller 30 is fixed to the shaft 36 and the one-way clutch 30a is provided on the timing pulley 40a so that it can rotate between the shaft 36 and the pulley 40a. It may be.
[0033]
The shaft 43 of the pickup roller 5 is connected to the shaft 46 through a pulley 45a, a timing belt 45b, and a pulley 45c. Both ends of the shaft 46 are supported by frames 39 and 39. A pickup motor 49 is connected to one end of the shaft 46 via a pulley 48a, a timing belt 48b, and a pulley 48c. The shaft 43 is rotatably attached to the bracket 51, and the bracket 51 is attached to the bracket 53 via the shaft 52.
[0034]
The bracket 53 is attached to the frames 39 and 39 via the shaft 46. A compression spring 56 is provided between the bracket 51 and the stay 55. As a result, the pickup rollers 5 and 5 on the left and right are devised so that the left and right pick-up rollers 5 and 5 are slightly changed in position to the front and rear and left and right to generate a uniform pressing force on the banknote P.
[0035]
The reverse roller 31 is made of rubber whose entire circumference is made of rubber, and the friction coefficient with respect to the bills P is higher than the friction coefficient between the bills P. The reverse rotation roller 31 is rotatably attached to the upper end portion of the swing lever 59 via a shaft 58, and the lower end portion of the swing lever 59 is rotatably supported by a shaft 60 as a support portion. The swing lever 59 is urged by a spring 62 and presses the reverse rotation roller 31 against the take-out roller 30.
[0036]
A reverse motor 64 as reverse torque applying means is connected to the shaft 58 of the reverse roller 31 via a pulley 63a, a timing belt 63b, and a pulley 63c. The reverse motor 64 rotates the reverse rotation roller 31 in the reverse direction with respect to the banknote P take-out direction. As will be described later, the reverse rotation roller 31 rotates in the take-out direction along with the take-out roller 30, but the reverse rotation torque is always applied in the reverse direction and generates a separating force for the banknote P.
[0037]
The pitch diameters of the timing pulley 63a fixed to the shaft 58 of the reverse roller 31 and the timing pulley 63c attached to the drive shaft 64a of the reverse motor 64 are the same. The reverse motor 64 is fixed to the stay 67 so that the axis of the shaft 60 of the swing lever 59 is positioned on the axis of the drive shaft 64a.
[0038]
The drive roller 34 is rotatably held by the frames 39 and 39 via a shaft 69. The shaft 69 is connected to the transport motor 71 via a pulley 70a, a timing belt 70b, and a pulley 70c. The pinch roller 35 is rotatably supported on the shaft 73. Both ends of the shaft 73 are supported by horizontal long holes 39 a of the frames 39, 39 and are urged by springs 74. By this urging, the pinch roller 35 is pressed by the drive roller 34 to generate a conveying force.
[0039]
In the vicinity of the take-out roller 30 and the reverse rotation roller 31, a first detection sensor 76 for detecting the banknote P delivered from the take-out roller 30 and the reverse rotation roller 31 is provided. In the vicinity of the drive roller 34 and the pinch roller 35, a second detection sensor 77 for detecting the bill P sent out from the drive roller 34 and the pinch roller 35 is provided. The first and second detection sensors 76 and 77 are light transmission type optical sensors and are attached to the bracket 79. The optical axis of the first detection sensor 76 passes through the conveyance path between the contact portion between the take-out roller 30 and the reverse rotation roller 31 and the contact portion between the drive roller 34 and the pinch roller 35. The optical axis of the second detection sensor 77 passes through the conveyance path immediately after the contact portion between the drive roller 34 and the pinch roller 35.
[0040]
Drivers 81, 82, and 83 are connected to the take-out motor 41, the pickup motor 49, and the transport motor 71, respectively. A controller 85 as a control means is connected to the drivers 81, 82, 83 via a control circuit. The take-out motor 41 and the pickup motor 49 require intermittent drive control, and a pulse motor is used. Drivers 89a and 89b are connected to the left and right reverse motors 64, and a controller 85 is connected to the drivers 89a and 89b via a control circuit. The reverse motor 64 is a DC motor capable of current control, and a required generated torque can be obtained by setting the current. A drive amplifier 90 is connected to the first and second detection sensors 76 and 77, and the passage of the banknote P is detected and the information is given to the controller 85.
[0041]
3 to 6 are schematic views of the separation part 32 and show the principle of generation of the separation force.
[0042]
FIG. 3 shows a state in which there is no banknote P between the take-out roller 30 and the reverse rotation roller 31, and the reverse rotation roller 31 is rotated in the transport direction as the take-out roller 30 rotates. The reverse rotation roller 31 is pressed against the take-out roller 30 with a predetermined pressing force H, and a reverse rotation torque T is applied by the reverse motor 64. However, since the torque due to the tangential force that is the frictional force with the take-out roller 30 is higher, the reverse motor 64 slips and the reverse rotation roller 31 rotates in the transport direction.
[0043]
FIG. 4 shows a case where one bill P is interposed between the take-out roller 30 and the reverse rotation roller 31, and the reverse rotation torque is greater than the torque applied to the reverse rotation roller 31 due to the tangential force generated by the frictional force between the bill P and the reverse rotation roller 31. Since T is set small, the reverse rotation roller 31 is rotated in the transport direction via the banknote P.
[0044]
FIG. 5 shows a case where two bills P are interposed between the take-out roller 30 and the reverse rotation roller 31. Since the frictional force generated between the bills P1 and P2 is small, the torque T of the reverse motor 64 wins. It is starting to reverse in the transport direction.
[0045]
FIG. 6 shows a state in which the second banknote P2 is pulled back by reverse rotation of the reverse motor 64. The state of FIG. 6 is substantially the same as the state of FIG. 4, and the first banknote P1 is conveyed. Thus, even if it is going to take out two banknotes, the 2nd banknote P2 is pulled back and only the 1st banknote P1 is taken out. In practice, the state shown in FIGS. 5 and 6 is repeatedly vibrated in small increments each time a banknote P is taken out, and is separated and taken out one by one.
[0046]
The tangential force that the second banknote P2 receives from the reverse rotation roller 31 acts as a separating force. From this tangential force and pressing force, the apparent friction coefficient of the reverse rotation roller 31 is (reverse rotation torque / reverse rotation roller radius) / reverse rotation roller pressure. Since the pressure of the reverse rotation roller 31 is constant by the spring force, the apparent friction coefficient of the reverse rotation torque can be kept constant by controlling the reverse rotation torque to be constant, and a stable separation force can be given.
[0047]
Moreover, an apparent friction coefficient can be set by changing the reverse rotation torque. The take-out roller 30 and the reverse roller 31 need only have a higher friction coefficient than the friction coefficient between the bills P1 and P2. If the friction coefficient between the take-out roller 30 and the reverse rotation roller 31 is high, the feed force and the separation force can be kept stable.
[0048]
Unlike the gate roller, the reverse rotation roller 31 does not need to maintain a moderate coefficient of friction, and the range of selection of materials is widened. Further, slipping with the banknote P does not always occur unlike the gate roller, and in principle there is no slipping with the banknote, which is advantageous in terms of wear resistance. The reverse rotation roller 31 actually slips with respect to the take-out roller 30 and the bill P, but a material with good durability may be selected in consideration of this.
[0049]
7 to 10 show the layout of each roller of the take-out device.
[0050]
The pickup roller 5 comes into contact with the bill P pressed by the backup 4, feeds it into the separation unit 32, and feeds out the bill P in cooperation with the take-out roller 30. The reverse rotation torque of the reverse rotation roller 31 is applied during the take-out operation, but when the banknote P is not present, the reverse rotation torque is set so as to follow the rotation of the take-out roller 30. In the MRR separation method, it is necessary to stably apply the pressing force and the reverse torque generated by the reverse motor 64 to the reverse roller 31.
[0051]
2 and 10, a disk 91 is attached to the drive shaft 64a of the reverse motor 64, and first and second photo interrupters 92 and 93 are disposed above and below the disk 91, respectively. ing. A driver 94 is connected to the first and second photo interrupters 92 and 93 through a signal path to constitute a detecting means 95.
[0052]
The driver 94 drives the first and second photo interrupters 92 and 93 and detects the rotation speed and the rotation direction of the reverse rotation roller 31 from the sensor signal transmitted from the photo interrupters 92 and 93. The driver 94 is connected to measuring means 97 described later via a signal circuit.
[0053]
FIG. 11 is a front view showing the disk 91.
[0054]
A plurality of first through holes 91a are formed in the outer portion of the disk 91 at predetermined intervals in the circumferential direction. Further, a plurality of second through holes 91b are concentrically formed in the disk 91 so as to be located inside the first through holes 91a. The first and second through holes 91a... And 91b... Have the same number at the same pitch angle, but are formed in a state shifted by 1/4 pitch in the circumferential direction. The first and second photo-interrupters 92 and 93 are attached to positions facing each other with a phase difference of 180 °, and an even number of first and second through holes 91a,.
[0055]
12 and 13 show signals output from the first and second photo interrupters 92 and 93. FIG.
[0056]
According to the rotation of the disk 91, light and dark rectangular signals are output from the first and second photo interrupters 92 and 93. When the reverse rotation roller 31 rotates in the reverse direction, as shown in FIG. A bright signal appears with a 1/4 pitch delay.
[0057]
On the contrary, when the reverse rotation roller 31 rotates forward with the take-out roller 30, the bright signal of the second photo interrupter 93 appears with a delay of 1/4 pitch, as shown in FIG.
[0058]
Further, when the rotational speed of the disk 91 is increased, the pitch of the rectangular wave signal is shortened, and when the speed is decreased, the pitch is increased. Therefore, the rotational direction and rotational speed of the reverse rotation roller 31 can be detected from the phase difference and frequency of the two signals output from the first and second photo interrupters 92 and 93.
[0059]
Such a speed sensor has the same principle as a commercially available rotary encoder, but here it is not necessary to measure the speed so accurately, and in order to reduce the inertia as much as possible, the disk 91 is directly attached to the motor shaft 64a. A structure to attach.
[0060]
FIG. 14 shows a case where the take-out roller 30 and the reverse rotation roller 31 are in contact with each other and are driven together. The take-out roller 30 rotates at the speed Vo, and the reverse rotation roller 31 rotates at the speed V.
[0061]
Although the reverse rotation torque T is applied to the reverse rotation roller 31 by the reverse motor 64, the torque due to the frictional force f applied from the take-out roller 30 is balanced, and rotates in the direction opposite to the motor torque T.
[0062]
The rotational speed V of the reversing roller 31 should be the same as the speed Vo of the take-out roller 30, but in reality, the rotation occurs due to deformation or slippage on the surface between the rollers 30 and 31. Thus, the speed becomes smaller than the speed Vo of the take-out roller 30.
[0063]
This slip amount tends to increase as the frictional force f between the rollers 30 and 31 decreases. The maximum value of the frictional force is f = μg · N, where N is the pressure contact force and μg is the friction coefficient between the rollers 30 and 31. Therefore, the slip between the rollers 30 and 31 decreases when the pressure contact force N and the friction coefficient μg are small. Becomes larger.
[0064]
Further, the condition that the rollers 30 and 31 are rotated is expressed by the following equation, where r is the radius of the reverse rotation roller 31.
[0065]
(Reverse torque T by reverse motor 64) <(torque by frictional force applied from take-out roller 30)

FIG. 15 is a graph showing the reverse torque applied by the reverse motor 64.
[0066]
This graph shows the pressing force N of the reverse rotation roller 31 on the horizontal axis and the reverse rotation torque T on the vertical axis.
The formula T = μg · N · r.
[0067]
Therefore, the condition that the reverse rotation roller 31 is rotated is an area under this straight line.
[0068]
In the MRR extraction, the combination of the pressing force N and the reverse torque T is an area below the straight line from the accompanying conditions. In this region, in principle, the reverse roller 31 should be rotated at the speed of the take-out roller 30 as described above, but actually rotates slower than this.
[0069]
Although the sliding speed depends on the magnitude of the accompanying speed Vo, it is about 20% or less of Vo in a normal case that gives a stable takeout. In the region above the straight line, the torque T of the reverse motor 64 overcomes μg · N · r and drives the reverse rotation roller 31, so that it is accelerated in the reverse direction and the slip speed is infinite in principle. It should be reversed, but it actually stays at a certain value.
[0070]
The broken line in the figure schematically shows the ratio of the sliding speed (Vo to V) / Vo. The sliding speed is small near the straight line, but increases as it moves away from the straight line.
[0071]
Incidentally, the ratio of the sliding speed is 1 when V = 0, and the rotation of the reverse rotation roller 31 is stopped. When the ratio of the sliding speed exceeds 1, V becomes a negative value, which indicates that the reverse rotation roller 31 rotates in the reverse rotation direction, that is, the rotation direction of the reverse motor 64.
[0072]
By the way, as the friction coefficient μg decreases, the slope of this straight line decreases. As indicated by the circles in the figure, even if a stable combination is achieved by normal rotation with a certain combination of T and N, the friction coefficient μg decreases and the straight line becomes less like a one-dot chain line. In this case, the circle mark is removed from the accompanying area and is rotated at a sliding speed greater than usual. Conversely, by observing the sliding speed, that is, the speed of the reverse rotation roller, a decrease in the friction coefficient μg can be detected.
[0073]
FIG. 16 is a block diagram showing a measuring device for measuring the friction coefficient between the take-out roller 30 and the reverse rotation roller 31.
[0074]
The detection means 95 described above is connected to the measurement means 97 via a signal path, and the measurement means 97 is connected to the controller 85 via a transmission circuit.
[0075]
The measuring means 97 detects the sliding speed between the take-out roller 30 and the reverse roller 31 from the rotational speed of the reverse roller 31 detected by the detecting means 95, and measures the friction coefficient between the rollers 30 and 31. Yes. The friction coefficient measured by the measuring means 97 is transmitted to the controller 85 via the transmission circuit, and the controller 85 performs various controls according to the magnitude of the friction coefficient as described in detail later. .
[0076]
FIG. 17 is a flowchart showing the measurement operation of the friction coefficient between the take-out roller 30 and the reverse rotation roller 31.
[0077]
First, the reverse roller 31 is driven in a state where there is no bill P between the take-out roller 30 and the reverse roller 31 (step ST1), and then the take-out roller 30 is driven (step ST2). At this time, the reverse rotation torque 31 used for the bill picking operation is applied to the reverse rotation roller 31. Next, the rotation speed of the reverse rotation roller 31 is detected by the detection means 95, and the sliding speed between the rollers 30 and 31 is detected by the measurement means 97 based on the detected rotation speed, and the friction coefficient is measured. The measured friction coefficient is transmitted to the controller 85 and compared with a predetermined value. That is, here, the ratio of the sliding speed is compared in three stages with three values of 1, 0.5, and 0.25. First, it is determined whether or not the ratio of the sliding speed is 1 or more (step ST3). If it is determined that the ratio of the sliding speed is 1 or more, the friction coefficient is considerably large in a state where the reverse rotation roller 31 is reversely rotated. It can be considered that the pressure has decreased or the pressure has decreased for another reason, and stable removal cannot be expected. At this time, it is determined that there is an abnormality and an error is given. After giving a warning, the operation of the device is stopped (step ST4).
[0078]
If it is determined that the ratio of the sliding speed is not 1 or more, it is determined whether the ratio of the sliding speed is smaller than 1 and larger than 0.5 (step ST5). If it is determined that the ratio is large, it is determined that the friction coefficient is relatively large, and an alarm is raised (step ST6) to inform the operator or maintenance personnel that a treatment such as roller cleaning is necessary. If it is determined that it is not large, it is determined whether or not the ratio of the sliding speed is smaller than 0.5 and larger than 0.25 (step ST7). When it is determined that the ratio is large, it is determined that the friction coefficient is slightly decreased, and cleaning is automatically performed by a method described later (step ST8). When it is determined that it is not large, the rotation of the reverse rotation roller 31 and the take-out roller 30 is stopped (step ST9), and the measurement is stopped.
[0079]
After the cleaning operation is completed, the loop is such that the sliding speed can be confirmed, and the measurement ends when the normal range is 0.25 or less.
[0080]
In addition, the automatic cleaning is intended to detect a relatively early decrease in the friction coefficient due to dirt on the rollers 30 and 31, and to recover this. If this series of operations is performed periodically, , Stable removal can be maintained.
[0081]
In addition, the friction coefficient measurement operation may be performed in manual mode at any time by an operator or maintenance personnel, or may be performed at regular intervals by monitoring the operation time or the number of processed tickets. Also good. In this case, since it does not seem to be performing a special operation when the idle rotation of the rollers 30 and 31 at the time when the banknote removal operation is completed in the removal operation, it may be safe.
[0082]
Next, automatic cleaning of the take-out roller 30 and the reverse rotation roller 31 will be described.
[0083]
When the banknotes are being taken out, deposits such as dirt are attached to the surfaces of the rollers 30 and 31 to reduce the friction coefficient. This decrease in the coefficient of friction leads to a decrease in separation ability, making it impossible to take out stably. Since automatic cleaning is performed without human intervention in such a case, fine maintenance is given in advance before the friction coefficient is further reduced.
[0084]
When the rollers are brought into contact with each other and driven with a difference in speed, there is an effect of rubbing each other and removing deposits on the surface. Since this operation is performed uniformly over the entire circumference of the roller, there is no adverse effect such as cutting a part of the roller to change the center. Although depending on the pressure contact speed between rollers, speed difference, dirt, etc., the coefficient of friction can be recovered by operation in a short time such as 1 to 2 seconds.
[0085]
FIG. 18 is a flowchart showing an automatic roller cleaning operation.
[0086]
First, the reverse rotation roller 31 is driven (step ST11), and then the take-out motor 41 is driven at a low speed (step ST12). As a result, the reverse rotation roller 31 and the take-out roller 30 rotate with a speed difference, and rub against each other to clean the surface. At this time, the take-out roller 41 is driven at a low speed because it is not necessary to rotate at the take-out speed.
[0087]
Next, the reverse rotation torque to be applied to the reverse rotation roller 31 is set to a torque T4 larger than the torque during the normal take-out operation (step ST13), and the rubbing force between the rollers 30 and 31 is increased to produce a cleaning effect. Thereafter, it is determined whether or not a predetermined time (about 1 to 2 seconds) has elapsed (step ST14). When it is determined that the predetermined time has elapsed, the rotation of the reverse rotation roller 31 and the take-out roller 30 is stopped ( Step ST15), the cleaning operation is terminated.
[0088]
If the rollers rub against each other, the temperature at the contact point is high, and if the rubber material is different, it may react and cause harmful effects. The MRR take-out does not require a combination in which the friction coefficient is changed for the roller of the separation portion unlike the take-out of the gate roller method, so the same rubber material having a relatively high friction coefficient is used for the take-out roller 30 and the reverse rotation roller 31. Therefore, the above problems do not occur.
[0089]
Further, in the case of the same rubber material, it is also advantageous that both are cleaned in the same manner and cleaned efficiently.
[0090]
Further, as described herein, this cleaning method may be performed in the friction coefficient measurement operation and used as an automatic cleaning, but of course, as an independent operation, the operator or maintenance personnel perform the cleaning manually. Also good.
[0091]
Further, in the present invention, when the friction coefficient between the rollers 30 and 31 is reduced, the magnitude of the reverse torque applied to the reverse roller 31 is reduced.
[0092]
As described with reference to FIG. 15, when the friction coefficient between the rollers 30 and 31 decreases, the slope of the straight line decreases. As indicated by the circles in the figure, even if a stable combination is achieved by normal rotation with a certain combination of T and N, the friction coefficient μg decreases and the straight line becomes less like a one-dot chain line. In this case, the circle mark is removed from the accompanying area and is rotated at a sliding speed greater than usual.
[0093]
Therefore, when the coefficient of friction between the rollers 30 and 31 is reduced, if the magnitude of the reverse rotation torque applied to the reverse rotation roller 31 is reduced, the circle is located in the region below the straight line indicated by the alternate long and short dash line. It is possible to carry around, and good takeout is possible.
[0094]
As described above, the friction coefficient of the rollers 30 and 31 is measured, and the cleaning is automatically performed based on the fact that the friction coefficient is lowered to restore the friction coefficient. Therefore, stable takeout can be realized.
[0095]
Further, since the change in the friction coefficient can be objectively grasped, it is possible to accurately determine whether or not cleaning is possible and the timing thereof.
[0096]
Furthermore, the roller can be automatically cleaned in-process during the take-out operation without requiring any special operation.
[0097]
In addition, since it is possible to clean frequently while there is little dirt, stable extraction can be realized without causing deterioration in the extraction performance.
[0098]
Further, since the degree of cleaning finish can be confirmed by friction measurement, stable cleaning is possible.
[0099]
【The invention's effect】
As described above, the present invention detects the rotational speed of the separation roller, detects the slip speed between the take-out roller and the separation roller based on the detected rotational speed, and measures the friction coefficient between the two rollers. Therefore, it is possible to objectively and accurately discriminate the decrease in the friction coefficient as compared with the case where the decrease in the friction coefficient between the two rollers is determined by a human sense. Therefore, cleaning at an optimal timing is possible, and good separation performance can be maintained.
[0100]
In addition, since the degree of cleaning finish can be confirmed by measuring the coefficient of friction, the cleaning state does not vary and good cleaning is possible.
[0101]
Further, by rotating with a speed difference in a state where the take-out roller and the separation roller are in contact with each other, cleaning is performed by rubbing each other, so that the cleaning operation is facilitated as compared with the case of manual cleaning.
[0102]
Further, the coefficient of friction can be measured during the take-out operation of the apparatus, the roller can be cleaned, and the operation efficiency of the apparatus can be maintained satisfactorily.
[0103]
In addition, since the magnitude of the reverse torque applied to the separation roller is variably controlled in accordance with the magnitude of the friction coefficient measured by the measuring means, it is possible to maintain good take-out of paper sheets even when the friction coefficient decreases. Can do.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a banknote sorting processor according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a bill separating mechanism.
FIG. 3 is a view showing a rotation state of a take-out roller and a reverse roller constituting a separation mechanism.
FIG. 4 is a diagram illustrating a state in which one banknote is fed between a take-out roller and a reverse rotation roller.
FIG. 5 is a view showing a state in which two bills are fed between a take-out roller and a reverse rotation roller.
FIG. 6 is a view showing a state where banknotes fed between a take-out roller and a reverse rotation roller are separated.
FIG. 7 is a front view showing an arrangement configuration of each roller constituting a bill separating mechanism.
FIG. 8 is a side view showing an arrangement configuration of each roller constituting a bill separating mechanism.
FIG. 9 is a front view showing a contact state between the take-out roller and the reverse rotation roller.
FIG. 10 is a side view showing a contact state between the take-out roller and the reverse rotation roller.
FIG. 11 is a front view showing a disk for detecting the rotation speed of the reverse rotation roller.
FIG. 12 is a diagram showing detection signals at the time of reverse rotation of the first and second photo interrupters.
FIG. 13 is a diagram showing detection signals at the time of forward rotation of the first and second photo interrupters.
FIG. 14 is a diagram showing a contact rotation operation of the take-out roller and the reverse rotation roller.
FIG. 15 is a graph showing the relationship between the reverse rotation torque applied to the reverse rotation roller and the pressing force.
FIG. 16 is a block diagram showing a measurement system for measuring a friction coefficient between the take-out roller and the reverse rotation roller.
FIG. 17 is a flowchart showing a friction coefficient measuring operation between the take-out roller and the reverse roller.
FIG. 18 is a flowchart showing a cleaning operation of the take-out roller and the reverse rotation roller.
[Explanation of symbols]
P ... paper sheets, 30 ... take-out roller, 31 ... reverse rotation roller (separation roller), 64 ... reverse motor (torque application means), 85 ... controller (control means), 95 ... detection means, 97 ... measurement means.

Claims (6)

A take-out roller for taking out paper sheets by rotating ;
A separation roller that is pressed against the take-out roller via the paper sheets and separates the paper sheets taken out by the take-out roller;
A torque applying means for applying a rotational torque that generates a force in a direction opposite to a tangential force generated when taking out the paper sheet of the take-out roller to the separation roller;
Detecting means for detecting a rotation speed of the separation roller rotating in a state where there is no paper sheet between the take-out roller and the separation roller ;
Measuring means for detecting a sliding speed between the take-out roller and the separating roller based on the rotational speed detected by the detecting means and measuring a friction coefficient between the two rollers;
Control means for cleaning the surface by rubbing the take-out roller and the separation roller with each other by rotation based on the fact that the measuring means has measured a predetermined coefficient of friction;
A paper sheet take-out apparatus comprising: A take-out roller for taking out paper sheets by rotating ;
A separation roller that is pressed against the take-out roller via the paper sheets and separates the paper sheets taken out by the take-out roller;
A torque applying means for applying a rotational torque that generates a force in a direction opposite to a tangential force generated when taking out the paper sheet of the take-out roller to the separation roller;
Detecting means for detecting a rotation speed of the separation roller rotating in a state where there is no paper sheet between the take-out roller and the separation roller ;
Measuring means for detecting a sliding speed between the take-out roller and the separating roller based on the rotational speed of the separating roller detected by the detecting means and measuring a friction coefficient between the two rollers;
And control means for cleaning its surface rubbed with each other by the measuring means rotates each to have a speed difference of both predetermined frictional coefficient the take-out roller and the separation roller Based upon the measured,
A paper sheet take-out apparatus comprising: A take-out roller for taking out paper sheets by rotating ;
A separation roller that is pressed against the take-out roller via the paper sheets and separates the paper sheets taken out by the take-out roller;
A torque applying means for applying a rotational torque that generates a force in a direction opposite to a tangential force generated when taking out the paper sheet of the take-out roller to the separation roller;
Detecting means for detecting a rotation speed of the separation roller rotating in a state where there is no paper sheet between the take-out roller and the separation roller ;
Measuring means for detecting a sliding speed between the take-out roller and the separating roller based on the rotational speed detected by the detecting means and measuring a friction coefficient between the two rollers;
Based on the measurement means measuring a predetermined friction coefficient, the take-out roller and the separation roller are rubbed against each other by rotation to clean the surface, and according to the magnitude of the friction coefficient measured by the measurement means. Control means for variably controlling the magnitude of the rotational torque applied to the separation roller;
A paper sheet take-out apparatus comprising: The control means based on said that measuring means to measure a predetermined following friction coefficient, the take-out roller and sheet take-out apparatus according to claim 2 or 3, wherein the stopping the driving of the separation roller. 4. The paper sheet according to claim 3, wherein the torque applying means makes the reverse torque applied during the cleaning operation of the take-out roller and the separation roller larger than the reverse torque applied during the paper sheet taking-out operation. Take-out device. The control means cleans the take-out roller and the separation roller, then detects again the slip of the take-out roller and the reverse roller, and performs a cleaning operation based on the fact that the friction coefficient between the take-out roller and the separation roller has returned to a predetermined value. The paper sheet take-out device according to claim 2, wherein the process is terminated.

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