EP0751906B1 - Sheet-removal arrangement having a cassette for holding a sheet stack - Google Patents

Sheet-removal arrangement having a cassette for holding a sheet stack Download PDF

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Publication number
EP0751906B1
EP0751906B1 EP95910432A EP95910432A EP0751906B1 EP 0751906 B1 EP0751906 B1 EP 0751906B1 EP 95910432 A EP95910432 A EP 95910432A EP 95910432 A EP95910432 A EP 95910432A EP 0751906 B1 EP0751906 B1 EP 0751906B1
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EP
European Patent Office
Prior art keywords
drive shaft
pressing force
cassette
displacement
sheet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95910432A
Other languages
German (de)
French (fr)
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EP0751906A1 (en
Inventor
Günter Holland-Letz
Peter Weigel
Waldemar Jäger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wincor Nixdorf International GmbH
Original Assignee
Wincor Nixdorf International GmbH
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Publication of EP0751906A1 publication Critical patent/EP0751906A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H1/00—Supports or magazines for piles from which articles are to be separated
    • B65H1/02—Supports or magazines for piles from which articles are to be separated adapted to support articles on edge
    • B65H1/025—Supports or magazines for piles from which articles are to be separated adapted to support articles on edge with controlled positively-acting mechanical devices for advancing the pile to present the articles to the separating device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/02—Separating articles from piles using friction forces between articles and separator
    • B65H3/06—Rollers or like rotary separators
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D11/00—Devices accepting coins; Devices accepting, dispensing, sorting or counting valuable papers
    • G07D11/10—Mechanical details
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D11/00—Devices accepting coins; Devices accepting, dispensing, sorting or counting valuable papers
    • G07D11/20—Controlling or monitoring the operation of devices; Data handling
    • G07D11/22—Means for sensing or detection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2402/00—Constructional details of the handling apparatus
    • B65H2402/60—Coupling, adapter or locking means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/40—Movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/30—Forces; Stresses
    • B65H2515/34—Pressure, e.g. fluid pressure

Definitions

  • the invention relates to a sheet removal device with a cassette for receiving a sheet stack and a method for regulating the pressing force of the sheet stack against the sheet removal device.
  • Such cassettes are used in sheet withdrawal devices, especially in automated teller machines.
  • the bundle of banknotes located in the cassette is pressed by a pressure element against an end wall of the cassette, which is designed in such a way that the foremost banknote is in contact with withdrawal elements which pass through the end wall.
  • These trigger elements are normally trigger rollers, but can also be trigger fingers or the like.
  • the banknote packet is pressed against the take-off rollers by a pressure plate which is moved in the cassette by a motor.
  • the pressure force of the take-off rollers against the foremost bank note is measured and used to control the drive motor.
  • the axis of the take-off rollers is slidably mounted on one side in the pressing direction is supported directly against a force sensor.
  • the contact force measured by the force sensor is directly proportional to the pressing force of the sheet stack on the take-off rollers.
  • a sheet feeder with the features of the preamble of claim 1 is known from DE-A-4 124 566.
  • the object of the present invention is to provide a sheet removal device with a cassette of the type mentioned, which ensures a constant pressing force with simple means, and in which a perfect removal of the individual sheets from the stack is ensured even when the stack surface is not completely flat, and a To name a process with which the pressure force can be regulated.
  • the invention is based on the knowledge that in the case of a rotating take-off shaft with at least two take-off rolls, the only abutment of which is between the take-off rolls and is in the coupling point for the torque, the entire pressure force acts on this abutment and is therefore to be measured there. This force is transferred to the drive shaft and must then also be measured in its bearings. Since the ratio with which the pressure force is distributed to the bearings always remains the same, it is sufficient to measure the force at one end of the drive shaft.
  • the pendulum shaft which can be freely pivoted about its pendulum axis, not only adapts to unevenness in the stack end surface, but also ensures that the pulling forces are distributed evenly when the pulling rollers are unequal.
  • Such an arrangement also tolerates the inclination of a drive shaft which deflects on one side, so that the problems which occur in the prior art are eliminated.
  • the torque is introduced into the drive shaft on the fixed side. Then only the bearing reaction forces have to be absorbed.
  • the other end of the drive shaft is slidably mounted perpendicular to the plane of the sheet. The force sensor acts on this.
  • the pressure force is determined by a spring that is non-positively coupled to the movable shaft end.
  • the displaceable pressure element pushes the sheet stack against the pull-off device and deflects the drive shaft in the process.
  • the spring is tensioned and generates a reaction force corresponding to the pressure force.
  • the deflection path of the spring is a measure of the pressing force of the sheet stack on the trigger device.
  • a displacement sensor can then be used as the force sensor, which detects the deflection path.
  • the cassette can be attached to the extraction device by pushing it on.
  • the travel sensor is designed so that it can also provide information about whether a cassette is pushed or not.
  • the sliding shaft end is stored in a sliding bearing. When the cassette is removed, this is brought into a first displacement position by the spring. When it is pushed onto the withdrawal device, the cassette engages the bearing and moves it into a second position against the spring force. This is reported by the travel sensor to a controller, which in turn now activates the pressure device, as a result of which the stack of sheets in the cassette is pushed against the take-off device, the shaft of which deviates as described and the spring is increasingly tensioned until a displacement path is signaled by the travel sensor, which corresponds to a predetermined pressure force. The pressure device is thereby switched off.
  • the control method is still described using an exemplary embodiment.
  • the displacement sensor comprises a reflection light barrier, the surface normal of a reflector attached to the movable bearing pointing in the direction of displacement.
  • a surface-mirrored planar reflector produces particularly reproducible measurement results.
  • the reflector is arranged at such a distance from the light barrier that the light spot generated by the light transmitter is imaged sharply on the edge of the light receiver and with approximately the size of the light-sensitive surface of the light receiver.
  • the change in distance between the light barrier and reflector associated with the displacement of the movable bearing causes a displacement-dependent change in the degree of illumination of the light-sensitive surface in the arrangement described above. This leads to a linear change in the output quantity of the light receiver which is directly proportional to the displacement.
  • the output variable is used to control the pressure motor.
  • FIG. 1 shows a part of a separating module, generally designated 10, which consists of a cuboid frame into which a cassette 14 containing a sheet stack 12 is inserted.
  • Pull-off rollers 16 of a pull-off device of the separating module 10 lie on the foremost sheet of the stack 12 contained in the cassette.
  • the stack 12 is biased in the direction of the pull-off rollers 16 by a pressing device 13 (FIG. 2) actuated by a pressing motor 46, so that the sheets of the stack 12 are constantly applied to the take-off rollers 16 with a certain preload.
  • the take-off rollers 16 are arranged on a drive shaft 18, one end 20 of which, in a manner which will be explained in more detail later is rotatably mounted in a frame-fixed bearing 21 and can be driven in the direction of arrow B.
  • the take-off rollers convey the sheet 22 of the stack 12 resting against them or, if appropriate, also a plurality of sheets 22, 24 adhering to one another in the direction of a nip between transport rollers 26 and counter-rollers 28, which are arranged on shafts 30 and 32 parallel to the drive shaft 18 and are driven in the same direction with the take-off rollers 16 in the direction of arrow B.
  • the transport rollers 26 have the task of conveying the sheet 22 which is in contact with them upwards through the nip, while the counter-rollers 28 are intended to prevent more than one sheet from passing through the nip between the transport rollers 26 and the counter-rollers 28.
  • the take-off rollers 16 are arranged on a tubular pendulum shaft 34. There are three pull-off rollers 16 arranged at an axial distance from one another, the middle pull-off roller lying exactly in the middle between the two outer pull-off rollers.
  • the pendulum shaft 34 is mounted on the drive shaft 18 by means of a universal joint, generally designated 48.
  • the universal joint comprises a bearing ball 50 which is fixedly connected to the drive shaft 18 and has annular bearing surfaces 52.
  • two axially parallel grooves 54 are formed in the surface of the bearing ball 50, only one of which is visible in FIG. 2.
  • spherical-shell-shaped bearing surfaces 56 are formed in the pendulum shaft 34. Bores 58 extend from the bearing surfaces 56 to both ends of the pendulum shaft 34, the diameter of which widens conically towards the free ends of the pendulum shaft 34, so that the pendulum shaft 34 extends parallel to it Axis 60 of the drive shaft 18 directed center position can be pivoted by any angle ⁇ / 2.
  • pins are provided in the area of the middle take-off roller on the inside of the pendulum shaft 34, which engage in the grooves 54 in the bearing ball 50. It also follows that, despite the torque transmission about axis 60, pivoting movement of pendulum shaft 34 about an axis perpendicular to the plane of the drawing is possible.
  • the pendulum shaft 34 Since only a pivoting movement of the pendulum shaft 34 perpendicular to the plane of the sheet 22 to be removed, i.e. perpendicular to the end face of the stack, the pendulum shaft 34 has at its left end in FIG. 2 a guide projection 36 which engages between the two legs 38 of a guide fork 40 (FIG. 1), which causes the pendulum shaft 34 to tilt around the end face of the stack vertical axis prevented and only allows a pendulum movement of the pendulum shaft 34 about an axis parallel to the stack end face.
  • the guide fork 40 is fastened to a support 42 which is rigidly connected to the frame of the separating module 10 and is indicated schematically in FIG. 1.
  • the other end 62 of the drive shaft 18 is mounted in a sliding bearing 64 designed as a sliding block, which can slide easily in a slot 66 in the frame wall 68.
  • a tension spring 70 engages, the other end via a pin 72 with the Frame wall 68 is coupled.
  • the spring 70 is arranged such that it pulls the displaceable end 62 of the drive shaft 18 in the direction of the cassette 14.
  • a flat, surface-mirrored reflector 74 is attached to the movable bearing 64 on its side remote from the cassette, the surface normal of which reflector points in the direction of displacement of the bearing 64.
  • a reflection light barrier 76 is arranged opposite the reflector 74, its center line 78 being perpendicular to the reflector 74.
  • a driver 80 is formed on the bearing 64 and protrudes into the insertion path of the cassette 14.
  • FIG. 3 which shows the pressing device 13 arranged in the cassette 14 with the pressing motor 46, a control device 44 and the measuring system for the pressing force consisting of the spring 70, the reflector 74 and the reflection light barrier 76, shows the mode of operation the sheet take-off device according to the invention explained below.
  • FIG. 4 shows the displacement distance output voltage characteristic of the aforementioned measuring system.
  • the focal length of the optical system of the light barrier 76 and the distance d between it and the reflector 74 are selected such that a light spot generated by the light transmitter 90 is sharp in the plane of the light receiver 92 and with a size substantially corresponding to the light-sensitive surface of the light receiver 92 is mapped.
  • the reflector 74 With the cassette 14 removed from the withdrawal system, the reflector 74 has a distance d 1 from the light barrier 76 which corresponds to an inclined position t of the drive shaft 18 (in FIG. 2 only the different inclined positions t, u, v, w of the drive shaft are shown for reasons of clarity 18 corresponding positions of their axis 60 shown). In this position, the light receiver 92 outputs a voltage U 1 . This voltage is stored as a minimum value in the controller 44.
  • the cassette 14 When the cassette 14 is pushed onto the withdrawal system, the cassette engages the driver 80, as a result of which the bearing 64 and with it the reflector 74 are displaced in the direction of the light barrier 76. In this position, the drive shaft assumes an inclined position u. The light receiver voltage U rises to a value that lies in the lower third of the working range 94 of the light barrier 76. From the fact that the voltage U has assumed a value different from U 1 , the controller 44 concludes that the cassette 14 is now in a working position from which sheets 22 can be pulled off the stack 12.
  • the pressure device 13 is displaced in the direction of the trigger device until a voltage U 3 is established at the upper end of the working area 94.
  • the reflector 74 is then at a distance d 3 from the light barrier 76 and the drive shaft is inclined w.
  • the controller 44 calculates an average working value for the pressing force of the sheet stack 12 against the take-off rollers 16, which leads to a distance d 2 between the reflector 74 and the light barrier 76 when the drive shaft 18 is inclined v.
  • a voltage U M corresponds to this distance.
  • the control device 44 By controlling the pressure motor 46 in the reverse direction, the control device 44 now reduces the pressure force to a value corresponding to a voltage U 2 , which is slightly above U M. If sheets 22 are now withdrawn from the cassette 14, the pressure force decreases. As soon as the output voltage of the light receiver falls below the value U M , the pressure force is up to one again U 2 corresponding value increased.
  • the difference between the values U 2 and U M corresponds to a predetermined number, preferably 10, of sheets 22 removed from the stack 12.
  • the arrangement described above permits precise control of the pressing force of the sheet stack 12 against the take-off rollers 16 with equal distribution of the take-off torque to all the take-off rollers.
  • the thickness of the sheet stack is irrelevant.
  • the resolution of the measuring system for the pressing force is increased by the fact that the deflection of the reflector is increased by the length ratio of the lever arms formed by the drive shaft 18, which is caused by the distance between the bearings 21 and 64 or between the bearing 21 and the bearing ball 50 are defined.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Controlling Sheets Or Webs (AREA)

Abstract

The invention relates to a sheet-removal arrangement having a cassette for holding a sheet stack, and to a method of controlling the pressure of the sheet stack on the removal arrangement. The latter comprises draw-off rollers (16) disposed on a floating shaft (34). The floating shaft (34) is in turn connected at the centre in a rotationally rigid manner to a drive shaft (18) passing through said floating shaft. At one end (20), the drive shaft (18) is mounted in a bearing (21) which is rigid with the frame and at its other end (62) it is mounted in a displaceable bearing (64). A force sensor (70, 74, 76) for determining the pressure of the sheet stack (12) on the draw-off rollers (16) acts on the displaceable bearing (64). The pressure is controlled so that it always moves within a narrow intermediate range between a minimum and a maximum possible value.

Description

Die Erfindung betrifft eine Blattabzugseinrichtung mit einer Kassette zur Aufnahme eines Blattstapels sowie ein Verfahren zur Regelung der Andruckkraft des Blattstapels gegen die Blattabzugseinrichtung.The invention relates to a sheet removal device with a cassette for receiving a sheet stack and a method for regulating the pressing force of the sheet stack against the sheet removal device.

Derartige Kassetten werden in Blattabzugseinrichtungen, vor allem in Geldscheinausgabeautomaten verwendet. Das in der Kassette befindliche Geldscheinpaket wird durch ein Andruckelement gegen eine Stirnwand der Kassette gedrückt, die so ausgebildet ist, daß der jeweils vorderste Geldschein in Kontakt mit durch die Stirnwand hindurchgreifenden Abzugselementen steht. Diese Abzugselemente sind normalerweise Abzugsrollen, können aber auch Abzugsfinger oder dergleichen sein.Such cassettes are used in sheet withdrawal devices, especially in automated teller machines. The bundle of banknotes located in the cassette is pressed by a pressure element against an end wall of the cassette, which is designed in such a way that the foremost banknote is in contact with withdrawal elements which pass through the end wall. These trigger elements are normally trigger rollers, but can also be trigger fingers or the like.

Es ist bereits bekannt, das Geldscheinpaket durch eine gefederte Andruckplatte gegen die Abzugselemente zu drücken, wobei die Andruckplatte über einen Weggeber die Steuerung eines Andruckschlittens auslöst. Hierbei ist es kaum möglich, eine eindeutig gleichbleibende Andruckkraft zu gewährleisten, da sich die Reibung der Geldscheine in der Kassette mit der Anzahl der Geldscheine im Paket und abhängig von deren Zustand (Knicke, Falten und dgl.) ändert.It is already known to press the bank note package against the trigger elements by means of a spring-loaded pressure plate, the pressure plate triggering the control of a pressure slide via a displacement sensor. It is hardly possible to guarantee a clearly constant pressure force, since the friction of the banknotes in the cassette changes with the number of banknotes in the package and depending on their condition (kinks, folds and the like).

Bei einer bekannten Blattabzugseinrichtung der eingangs genannten Art (DE 34 34 780 C2) wird das Geldscheinpaket von einer Andruckplatte gegen die Abzugsrollen gedrückt, die von einem Motor in der Kassette verschoben wird. Dabei wird die Andruckkraft der Abzugsrollen gegen den vordersten Geldschein gemessen und zur Steuerung des Antriebsmotors verwendet. Dazu ist die Achse der Abzugsrollen auf einer Seite in Andruckrichtung verschiebbar gelagert, wobei sie sich direkt gegen einen Kraftsensor abstützt. Die vom Kraftsensor gemessene Auflagekraft ist direkt proportional zur Andruckkraft des Blattstapels auf die Abzugsrollen.In a known sheet take-off device of the type mentioned at the beginning (DE 34 34 780 C2), the banknote packet is pressed against the take-off rollers by a pressure plate which is moved in the cassette by a motor. The pressure force of the take-off rollers against the foremost bank note is measured and used to control the drive motor. For this purpose, the axis of the take-off rollers is slidably mounted on one side in the pressing direction is supported directly against a force sensor. The contact force measured by the force sensor is directly proportional to the pressing force of the sheet stack on the take-off rollers.

Allerdings besteht durch die Schrägstellung der Abzugswelle gegenüber dem Blattstapel, die durch das einseitige Ausweichen der Achse bedingt ist, die Gefahr von Abzugsfehlern und des Verkantens der Geldscheine. Dieses Problem wird noch dadurch verschärft, daß insbesondere Stapel von Banknoten nicht über die gesamte Stapelfläche gleich dick sind. Alle Verformungen, Verpackungsdeformationen, Sicherheitsfadenverdickungen und Tiefdruckprägungen an den Notenbündeln führen bei großen Stapeln zu Änderungen der Stapeldicke über die Stapelfläche und damit auch zu ungleichen Andruckkräften an den Abzugsrollen. Ein Ausgleichen dieser Dickenunterschiede speziell bei großen Füllmengen von beispielsweise mehr als tausend Banknoten in der Kassette durch eine höhere Andruckkraft ist nicht oder nur in unzureichenden Maße möglich. Das gesamte Abzugssystem arbeitet aber nur störungsfrei, wenn die Banknoten möglichst gerade und gleichmäßig aus der Kassette abgezogen werden.However, due to the inclined position of the trigger shaft in relation to the stack of sheets, which is caused by the one-sided dodging of the axis, there is a risk of trigger errors and tilting of the banknotes. This problem is exacerbated by the fact that, in particular, stacks of bank notes are not of equal thickness over the entire stack area. All deformations, packaging deformations, thickening of security threads and gravure embossing on the bundles of notes lead to changes in the stack thickness across the stacking surface in the case of large stacks and thus to uneven pressure forces on the take-off rollers. Compensating for these differences in thickness, in particular in the case of large filling quantities of, for example, more than a thousand banknotes in the cassette by means of a higher pressing force, is not possible or is possible only to an inadequate extent. The entire withdrawal system only works trouble-free if the banknotes are withdrawn from the cassette in a straight and even manner.

Eine Blatteinzugseinrichtung mit den Merkmalen des Oberbegriffs von Anspruch 1 ist aus der DE-A- 4 124 566 bekannt.A sheet feeder with the features of the preamble of claim 1 is known from DE-A-4 124 566.

Die Aufgabe der vorliegenden Erfindung ist es, eine Blattabzugseinrichtung mit einer Kassette der eingangs genannten Art bereitzustellen, die eine gleichbleibende Andruckkraft mit einfachen Mitteln gewährleistet, und bei welcher auch bei nicht völlig planer Stapeloberfläche ein einwandfreier Abzug der einzelnen Blätter vom Stapel gewährleistet wird, sowie ein Verfahren zu nennen, mit dem die Andruckkraft regelbar ist.The object of the present invention is to provide a sheet removal device with a cassette of the type mentioned, which ensures a constant pressing force with simple means, and in which a perfect removal of the individual sheets from the stack is ensured even when the stack surface is not completely flat, and a To name a process with which the pressure force can be regulated.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Anspruchs 1 bzw. 8 gelöst.According to the invention, this object is achieved by the features of claims 1 and 8, respectively.

Die Erfindung beruht auf der Erkenntnis, daß bei einer rotierenden Abzugswelle mit mindestens zwei Abzugsrollen, deren einziges Widerlager sich zwischen den Abzugsrollen und im Einkoppelpunkt für das Drehmoment befindet, die gesamte Andruckkraft an diesem Widerlager angreift und mithin dort zu messen ist. Diese Kraft wird auf die Antriebswelle übergeleitet und ist dann auch in deren Lagern zu messen. Da das Verhältnis, mit dem die Andruckkraft sich auf die Lager verteilt, stets gleich bleibt, genügt es, die Kraft an einem Ende der Antriebswelle zu messen. Durch die Führung der Pendelwelle zwischen senkrecht zur Blattebene gerichteten Schenkeln einer Führungsgabel ist dabei sichergestellt, daß nur senkrecht auf die Fläche des vordersten Blattes gerichtete Kräfte wirksam werden und in die Messung eingehen. Die um ihre durch das Widerlager gehende Pendelachse frei schwenkbare Pendelwelle paßt sich nicht nur Unebenheiten der Stapelendfläche an, sondern sorgt auch selbst bei ungleichen Reibwerten an den Abzugsrollen für eine Gleichverteilung der Abzugskräfte.The invention is based on the knowledge that in the case of a rotating take-off shaft with at least two take-off rolls, the only abutment of which is between the take-off rolls and is in the coupling point for the torque, the entire pressure force acts on this abutment and is therefore to be measured there. This force is transferred to the drive shaft and must then also be measured in its bearings. Since the ratio with which the pressure force is distributed to the bearings always remains the same, it is sufficient to measure the force at one end of the drive shaft. By guiding the pendulum shaft between the legs of a guide fork directed perpendicular to the plane of the sheet, it is ensured that only forces directed perpendicular to the surface of the foremost sheet are effective and are included in the measurement. The pendulum shaft, which can be freely pivoted about its pendulum axis, not only adapts to unevenness in the stack end surface, but also ensures that the pulling forces are distributed evenly when the pulling rollers are unequal.

Von einer solchen Anordnung wird auch die Schieflage einer einseitig ausweichenden Antriebswelle toleriert, so daß die bei dem Stand der Technik auftretenden Probleme behoben sind. In die Antriebswelle wird gemäß einer Weiterbildung der Erfindung das Drehmoment auf der fest gelagerten Seite eingeleitet. Es sind dann nur die Lagerreaktionskräfte aufzufangen. Das andere Ende der Antriebswelle ist senkrecht zur Blattebene verschieblich gelagert. An diesem greift der Kraftsensor an.Such an arrangement also tolerates the inclination of a drive shaft which deflects on one side, so that the problems which occur in the prior art are eliminated. According to a development of the invention, the torque is introduced into the drive shaft on the fixed side. Then only the bearing reaction forces have to be absorbed. The other end of the drive shaft is slidably mounted perpendicular to the plane of the sheet. The force sensor acts on this.

Die Andruckkraft wird durch eine Feder bestimmt, die mit dem verschieblichen Wellenende kraftschlüssig gekoppelt ist. Das verschiebliche Andruckelement schiebt den Blattstapel gegen die Abzugseinrichtung und lenkt dabei die Antriebswelle aus. Dabei wird die Feder gespannt und erzeugt eine der Andruckkraft entsprechende Reaktionskraft. Der Auslenkweg der Feder ist dabei ein Maß für die Andruckkraft des Blattstapels an die Abzugseinrichtung. Als Kraftsensor kann dann ein Weggeber eingesetzt werden, der den Auslenkweg erfaßt.The pressure force is determined by a spring that is non-positively coupled to the movable shaft end. The displaceable pressure element pushes the sheet stack against the pull-off device and deflects the drive shaft in the process. The spring is tensioned and generates a reaction force corresponding to the pressure force. The deflection path of the spring is a measure of the pressing force of the sheet stack on the trigger device. A displacement sensor can then be used as the force sensor, which detects the deflection path.

Die Kassette ist an die Abzugseinrichtung durch Anschieben ansetzbar. Der Weggeber ist dabei so ausgebildet, daß er auch eine Information darüber abgeben kann, ob eine Kassette angeschoben ist oder nicht. Das verschiebliche Wellenende ist dabei in einem verschieblichen Lager gelagert. Dieses wird bei abgenommener Kassette von der Feder in eine erste Verschiebeposition gebracht. Beim Anschieben an die Abzugseinrichtung greift die Kassette an dem Lager an und verschiebt es entgegen der Federkraft in eine zweite Position. Diese wird von dem Weggeber an eine Steuerung gemeldet, die nun ihrerseits die Andruckvorrichtung aktiviert, wodurch der Blattstapel in der Kassette gegen die Abzugseinrichtung geschoben wird, deren Welle wie beschrieben ausweicht und dabei die Feder zunehmend spannt, bis von dem Weggeber ein Auslenkweg signalisiert wird, der einer vorgegebenen Andruckkraft entspricht. Dadurch wird die Andruckvorrichtung abgeschaltet. Das Steuerungsverfahren wird anhand eines Ausführungsbeispiels noch beschrieben.The cassette can be attached to the extraction device by pushing it on. The travel sensor is designed so that it can also provide information about whether a cassette is pushed or not. The sliding shaft end is stored in a sliding bearing. When the cassette is removed, this is brought into a first displacement position by the spring. When it is pushed onto the withdrawal device, the cassette engages the bearing and moves it into a second position against the spring force. This is reported by the travel sensor to a controller, which in turn now activates the pressure device, as a result of which the stack of sheets in the cassette is pushed against the take-off device, the shaft of which deviates as described and the spring is increasingly tensioned until a displacement path is signaled by the travel sensor, which corresponds to a predetermined pressure force. The pressure device is thereby switched off. The control method is still described using an exemplary embodiment.

Gemäß einer bevorzugten Weiterbildung umfaßt der Weggeber eine Reflexionslichtschranke, wobei die Flächennormale eines an dem verschieblichen Lager angebrachten Reflektors in Verschieberichtung weist. Dabei ergibt ein oberflächenverspiegelter planarer Reflektor besonders gut reproduzierbare Meßergebnisse.According to a preferred development, the displacement sensor comprises a reflection light barrier, the surface normal of a reflector attached to the movable bearing pointing in the direction of displacement. A surface-mirrored planar reflector produces particularly reproducible measurement results.

Der Reflektor ist in einer solchen Entfernung zu der Lichtschranke angeordnet, daß der von dem Lichtsender erzeugte Lichtfleck auf dem Lichtempfänger randscharf und mit etwa der Größe der lichtempfindlichen Fläche des Lichtempfängers abgebildet wird. Die mit der Verschiebung des verschieblichen Lagers verbundene Entfernungsänderung zwischen Lichtschranke und Reflektor bewirkt bei der vorbeschriebenen Anordnung eine verschiebungsabhängige Veränderung des Ausleuchtungsgrades der lichtempfindlichen Fläche. Dies führt zu einer linearen, der Verschiebung direkt proportionalen Änderung der Ausgangsgröße des Lichtempfängers. Die Ausgangsgröße dient der Steuerung des Andruckmotors.The reflector is arranged at such a distance from the light barrier that the light spot generated by the light transmitter is imaged sharply on the edge of the light receiver and with approximately the size of the light-sensitive surface of the light receiver. The change in distance between the light barrier and reflector associated with the displacement of the movable bearing causes a displacement-dependent change in the degree of illumination of the light-sensitive surface in the arrangement described above. This leads to a linear change in the output quantity of the light receiver which is directly proportional to the displacement. The output variable is used to control the pressure motor.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen und der folgenden Beschreibung, welche in Verbindung mit den beigefügten Zeichnungen die Erfindung anhand eines Ausführungsbeispieles erläutert. Es zeigt:

Fig. 1
eine schematische Teilseitenansicht eines Speicherbehälters für Banknoten und der wesentlichen Elemente einer Abzugs- und Vereinzelungseinrichtung,
Fig. 2
einen die Achse enthaltenden Schnitt durch die Pendelwelle mit der Antriebswelle in Draufsicht,
Fig. 3
eine schematische Darstellung einer aus Andruck-, Kraftmeß- und Steuersystem bestehenden Anordnung,
Fig. 4
die Kennlinie des Kraftmeßsystems in Fig. 3.
Further features and advantages of the invention emerge from the subclaims and the following description, which explains the invention in conjunction with the accompanying drawings using an exemplary embodiment. It shows:
Fig. 1
1 shows a schematic partial side view of a storage container for banknotes and the essential elements of a withdrawal and separating device,
Fig. 2
a section containing the axis through the pendulum shaft with the drive shaft in plan view,
Fig. 3
1 shows a schematic illustration of an arrangement consisting of a pressure, force measuring and control system,
Fig. 4
the characteristic of the force measuring system in Fig. 3rd

In Fig. 1 erkennt man einen Teil eines allgemein mit 10 bezeichneten Vereinzelungsmoduls, der aus einem quaderförmigen Rahmen besteht, in den eine einen Blattstapel 12 enthaltende Kassette 14 eingeschoben ist. Abzugsrollen 16 einer Abzugseinrichtung des Vereinzelungsmoduls 10 liegen an dem vordersten Blatt des in der Kassette enthaltenden Stapels 12. Der Stapel 12 wird durch eine von einem Andruckmotor 46 betätigte Andruckvorrichtung 13 (Fig. 2) in Richtung auf die Abzugsrollen 16 vorgespannt, so daß die Blätter des Stapels 12 ständig mit einer gewissen Vorspannung an den Abzugsrollen 16 anliegen. Die Abzugsrollen 16 sind in einer Weise, die später noch näher erläutert wird, auf einer Antriebswelle 18 angeordnet, deren eines Ende 20 in einem rahmenfesten Lager 21 drehbar gelagert ist und in Richtung des Pfeiles B antreibbar ist.1 shows a part of a separating module, generally designated 10, which consists of a cuboid frame into which a cassette 14 containing a sheet stack 12 is inserted. Pull-off rollers 16 of a pull-off device of the separating module 10 lie on the foremost sheet of the stack 12 contained in the cassette. The stack 12 is biased in the direction of the pull-off rollers 16 by a pressing device 13 (FIG. 2) actuated by a pressing motor 46, so that the sheets of the stack 12 are constantly applied to the take-off rollers 16 with a certain preload. The take-off rollers 16 are arranged on a drive shaft 18, one end 20 of which, in a manner which will be explained in more detail later is rotatably mounted in a frame-fixed bearing 21 and can be driven in the direction of arrow B.

Die Abzugsrollen fördern das jeweils an ihnen anliegende Blatt 22 des Stapels 12 oder gegebenenfalls auch mehrere aneinander haftende Blätter 22, 24 in Richtung auf einen Walzenspalt zwischen Transportrollen 26 und Gegenlaufrollen 28, die auf zu der Antriebswelle 18 parallelen Wellen 30 bzw. 32 angeordnet sind und gleichsinnig mit den Abzugsrollen 16 in Richtung des Pfeiles B antreibbar sind. Die Transportrollen 26 haben die Aufgabe, das an ihnen anliegende Blatt 22 durch den Walzenspalt nach oben zu fördern, während die Gegenlaufrollen 28 verhindern sollen, daß mehr als ein Blatt durch den Walzenspalt zwischen den Transportrollen 26 und den Gegenlaufrollen 28 hindurch tritt.The take-off rollers convey the sheet 22 of the stack 12 resting against them or, if appropriate, also a plurality of sheets 22, 24 adhering to one another in the direction of a nip between transport rollers 26 and counter-rollers 28, which are arranged on shafts 30 and 32 parallel to the drive shaft 18 and are driven in the same direction with the take-off rollers 16 in the direction of arrow B. The transport rollers 26 have the task of conveying the sheet 22 which is in contact with them upwards through the nip, while the counter-rollers 28 are intended to prevent more than one sheet from passing through the nip between the transport rollers 26 and the counter-rollers 28.

Die Abzugsrollen 16 sind auf einer rohrförmigen Pendelwelle 34 angeordnet. Es sind drei in einem axialen Abstand zueinander angeordnete Abzugsrollen 16 vorgesehen, wobei die mittlere Abzugsrolle genau in der Mitte zwischen den beiden äußeren Abzugsrollen liegt.The take-off rollers 16 are arranged on a tubular pendulum shaft 34. There are three pull-off rollers 16 arranged at an axial distance from one another, the middle pull-off roller lying exactly in the middle between the two outer pull-off rollers.

Die Pendelwelle 34 ist mittels eines allgemein mit 48 bezeichneten Universalgelenkes auf der Antriebswelle 18 gelagert. Das Universalgelenk umfaßt eine fest mit der Antriebswelle 18 verbundene Lagerkugel 50 mit ringförmigen Lagerflächen 52. In der Oberfläche der Lagerkugel 50 sind im vorliegenden Beispiel zwei achsparallele Nuten 54 ausgebildet, von denen in Fig. 2 nur eine sichtbar ist.The pendulum shaft 34 is mounted on the drive shaft 18 by means of a universal joint, generally designated 48. The universal joint comprises a bearing ball 50 which is fixedly connected to the drive shaft 18 and has annular bearing surfaces 52. In the present example, two axially parallel grooves 54 are formed in the surface of the bearing ball 50, only one of which is visible in FIG. 2.

Im Bereich der mittleren Abzugsrolle 16 genau in der Mitte zwischen den beiden äußeren Abzugsrollen sind in der Pendelwelle 34 kugelschalenförmige Lagerflächen 56 ausgebildet. Von den Lagerflächen 56 erstrecken sich nach beiden Enden der Pendelwelle 34 hin Bohrungen 58, deren Durchmesser sich zu den freien Enden der Pendelwelle 34 hin konisch erweitert, so daß die Pendelwelle 34 aus ihrer parallel zur Achse 60 der Antriebswelle 18 gerichteten Mittelstellung nach jeder beliebigen Seite um den Winkel β/2 verschwenkt werden kann.In the area of the middle take-off roller 16, exactly in the middle between the two outer take-off rollers, spherical-shell-shaped bearing surfaces 56 are formed in the pendulum shaft 34. Bores 58 extend from the bearing surfaces 56 to both ends of the pendulum shaft 34, the diameter of which widens conically towards the free ends of the pendulum shaft 34, so that the pendulum shaft 34 extends parallel to it Axis 60 of the drive shaft 18 directed center position can be pivoted by any angle β / 2.

Um eine Drehmomentübertragung von der Antriebswelle 18 auf die Pendelwelle 34 unter Beibehaltung der Verschwenkbarkeit derselben zu ermöglichen, sind im Bereich der mittleren Abzugsrolle an der Innenseite der Pendelwelle 34 nicht dargestellte Zapfen vorgesehen, welche in die Nuten 54 in der Lagerkugel 50 eingreifen. Daraus ergibt sich auch, daß trotz der Drehmomentübertragung um die Achse 60 eine Schwenkbewegung der Pendelwelle 34 um eine zur Zeichenebene senkrechte Achse möglich ist.To enable torque transmission from the drive shaft 18 to the pendulum shaft 34 while maintaining the pivotability thereof, pins (not shown) are provided in the area of the middle take-off roller on the inside of the pendulum shaft 34, which engage in the grooves 54 in the bearing ball 50. It also follows that, despite the torque transmission about axis 60, pivoting movement of pendulum shaft 34 about an axis perpendicular to the plane of the drawing is possible.

Da für eine Gleichverteilung der Abzugskräfte nur eine Schwenkbewegung der Pendelwelle 34 senkrecht zur Ebene des abzuziehenden Blattes 22, d.h. senkrecht zur Stapelendfläche gewünscht wird, weist die Pendelwelle 34 an ihrem in der Fig. 2 linken Ende einen Führungsansatz 36 auf, der zwischen den beiden Schenkeln 38 einer Führungsgabel 40 eingreitt (Fig. 1), welche eine Kippbewegung der Pendelwelle 34 um eine zur Stapelendfläche senkrechte Achse verhindert und nur eine Pendelbewegung der Pendelwelle 34 um eine zur Stapelendfläche parallele Achse ermöglicht. Die Führungsgabel 40 ist an einem mit dem Rahmen des Vereinzelungsmoduls 10 starr verbundenen Träger 42 befestigt, der in Figur 1 schematisch angedeutet ist.Since only a pivoting movement of the pendulum shaft 34 perpendicular to the plane of the sheet 22 to be removed, i.e. perpendicular to the end face of the stack, the pendulum shaft 34 has at its left end in FIG. 2 a guide projection 36 which engages between the two legs 38 of a guide fork 40 (FIG. 1), which causes the pendulum shaft 34 to tilt around the end face of the stack vertical axis prevented and only allows a pendulum movement of the pendulum shaft 34 about an axis parallel to the stack end face. The guide fork 40 is fastened to a support 42 which is rigidly connected to the frame of the separating module 10 and is indicated schematically in FIG. 1.

Die soweit beschriebene Anordnung ist - mit Ausnahme des Andruckmotors 46 - aus der deutschen Patentschrift DE 41 24 566 C1 bekannt.The arrangement described so far - with the exception of the pressure motor 46 - is known from the German patent DE 41 24 566 C1.

Das andere Ende 62 der Antriebswelle 18 ist in einem als Kulissenstein ausgebildeten verschieblichen Lager 64 gelagert, das in einem Schlitz 66 in der Rahmenwand 68 leichtgängig gleiten kann. An dem Lager 64 greift eine Zugfeder 70 an, deren anderes Ende über einen Zapfen 72 mit der Rahmenwand 68 gekoppelt ist. Die Feder 70 ist derart angeordnet, daß sie das verschiebliche Ende 62 der Antriebswelle 18 in Richtung der Kassette 14 zieht.The other end 62 of the drive shaft 18 is mounted in a sliding bearing 64 designed as a sliding block, which can slide easily in a slot 66 in the frame wall 68. On the bearing 64, a tension spring 70 engages, the other end via a pin 72 with the Frame wall 68 is coupled. The spring 70 is arranged such that it pulls the displaceable end 62 of the drive shaft 18 in the direction of the cassette 14.

An seiner kassettenfernen Seite ist an dem verschieblichen Lager 64 ein planer, oberflächenverspiegelter Reflektor 74 angebracht, dessen Flächennormale in Verschieberichtung des Lagers 64 weist. Eine Reflexionslichtschranke 76, ist gegenüber dem Reflektor 74 angeordnet, wobei ihre Mittellinie 78 senkrecht auf dem Reflektor 74 steht.A flat, surface-mirrored reflector 74 is attached to the movable bearing 64 on its side remote from the cassette, the surface normal of which reflector points in the direction of displacement of the bearing 64. A reflection light barrier 76 is arranged opposite the reflector 74, its center line 78 being perpendicular to the reflector 74.

An das Lager 64 ist ein Mitnehmer 80 angeformt, der in den Einschubweg der Kassette 14 ragt.A driver 80 is formed on the bearing 64 and protrudes into the insertion path of the cassette 14.

Anhand der Fig. 3, die die in der Kassette 14 angeordnete Andruckvorrichtung 13 mit dem Andruckmotor 46, eine Steuereinrichtung 44 und das aus der Feder 70, dem Reflektor 74 und der Reflexionslichtschranke 76 bestehende Meßsystem für die Andruckkraft in schematischer Darstellung zeigt, wird die Wirkungsweise der erfindungsgemäßen Blattabzugseinrichtung nachfolgend erläutert. Dabei wird auch auf Fig. 4 Bezug genommen, die die Verschiebungsweg-Ausgangsspannungs-Kennlinie des vorgenannten Meßsystems zeigt.3, which shows the pressing device 13 arranged in the cassette 14 with the pressing motor 46, a control device 44 and the measuring system for the pressing force consisting of the spring 70, the reflector 74 and the reflection light barrier 76, shows the mode of operation the sheet take-off device according to the invention explained below. Reference is also made to FIG. 4, which shows the displacement distance output voltage characteristic of the aforementioned measuring system.

Die Brennweite des optischen Systems der Lichtschranke 76 und der Abstand d zwischen dieser und dem Reflektor 74 sind so gewählt, daß ein von dem Lichtsender 90 erzeugter Lichtfleck randscharf in der Ebene des Lichtempfängers 92 und mit einer der lichtempfindlichen Fläche des Lichtempfängers 92 im wesentlichen entsprechenden Größe abgebildet wird.The focal length of the optical system of the light barrier 76 and the distance d between it and the reflector 74 are selected such that a light spot generated by the light transmitter 90 is sharp in the plane of the light receiver 92 and with a size substantially corresponding to the light-sensitive surface of the light receiver 92 is mapped.

Bei von dem Abzugssystem abgenommener Kassette 14 hat der Reflektor 74 eine Entfernung d1 von der Lichtschranke 76, die einer Schrägstellung t der Antriebswelle 18 entspricht (in Fig. 2 sind aus Übersichtlichkeitsgründen nur die den verschiedenen Schrägstellungen t, u, v, w der Antriebswelle 18 entsprechenden Positionen von deren Achse 60 dargestellt). In dieser Position gibt der Lichtempfänger 92 eine Spannung U1 ab. Diese Spannung wird als minimaler Wert in der Steuerung 44 gespeichert.With the cassette 14 removed from the withdrawal system, the reflector 74 has a distance d 1 from the light barrier 76 which corresponds to an inclined position t of the drive shaft 18 (in FIG. 2 only the different inclined positions t, u, v, w of the drive shaft are shown for reasons of clarity 18 corresponding positions of their axis 60 shown). In this position, the light receiver 92 outputs a voltage U 1 . This voltage is stored as a minimum value in the controller 44.

Beim Anschieben der Kassette 14 an das Abzugssystem greift die Kassette an dem Mitnehmer 80 an, wodurch das Lager 64 und mit ihm der Reflektor 74 in Richtung der Lichtschranke 76 verschoben wird. In dieser Position nimmt die Antriebswelle eine Schrägstellung u ein. Die Lichtempfängerspannung U steigt dabei auf einen Wert an, der im unteren Drittel des Arbeitsbereichs 94 der Lichtschranke 76 liegt. Aus der Tatsache, daß die Spannung U einen von U1 verschiedenen Wert angenommen hat, schließt die Steuerung 44, daß die Kassette 14 sich nun in einer Arbeitsposition befindet, aus der Blätter 22 vom Stapel 12 abgezogen werden können.When the cassette 14 is pushed onto the withdrawal system, the cassette engages the driver 80, as a result of which the bearing 64 and with it the reflector 74 are displaced in the direction of the light barrier 76. In this position, the drive shaft assumes an inclined position u. The light receiver voltage U rises to a value that lies in the lower third of the working range 94 of the light barrier 76. From the fact that the voltage U has assumed a value different from U 1 , the controller 44 concludes that the cassette 14 is now in a working position from which sheets 22 can be pulled off the stack 12.

Nun wird die Andruckvorrichtung 13 unter Steuerung der Steuereinrichtung 44 in Richtung auf die Abzugseinrichtung so weit verschoben, bis sich eine Spannung U3 am oberen Ende des Arbeitsbereichs 94 einstellt. Der Reflektor 74 hat dann einen Abstand d3 zu der Lichtschranke 76 und die Antriebswelle eine Schrägstellung w. Aus den Werten U1 und U3 errechnet die Steuerung 44 einen mittleren Arbeitswert für die Andruckkraft des Blattstapels 12 gegen die Abzugsrollen 16, der bei einer Schrägstellung v der Antriebswelle 18 zu einem Abstand d2 zwischen Reflektor 74 und Lichtschranke 76 führt. Diesem Abstand entspricht eine Spannung UM.Now, under the control of the control device 44, the pressure device 13 is displaced in the direction of the trigger device until a voltage U 3 is established at the upper end of the working area 94. The reflector 74 is then at a distance d 3 from the light barrier 76 and the drive shaft is inclined w. From the values U 1 and U 3, the controller 44 calculates an average working value for the pressing force of the sheet stack 12 against the take-off rollers 16, which leads to a distance d 2 between the reflector 74 and the light barrier 76 when the drive shaft 18 is inclined v. A voltage U M corresponds to this distance.

Die Steuereinrichtung 44 verringert nun durch Ansteuerung des Andruckmotors 46 in Rückwärtsrichtung die Andruckkraft auf einen einer Spannung U2 entsprechenden Wert, der geringfügig über UM liegt. Werden nun Blätter 22 aus der Kassette 14 abgezogen, geht die Andruckkraft zurück. Sobald die Ausgangsspannung des Lichtempfängers den Wert UM unterschreitet, wird die Andruckkraft wieder bis zu einem U2 entsprechenden Wert erhöht. Die Differenz zwischen den Werten U2 und UM entspricht einer vorgegebenen Zahl, vorzugsweise 10, von dem Stapel 12 abgezogener Blätter 22.By controlling the pressure motor 46 in the reverse direction, the control device 44 now reduces the pressure force to a value corresponding to a voltage U 2 , which is slightly above U M. If sheets 22 are now withdrawn from the cassette 14, the pressure force decreases. As soon as the output voltage of the light receiver falls below the value U M , the pressure force is up to one again U 2 corresponding value increased. The difference between the values U 2 and U M corresponds to a predetermined number, preferably 10, of sheets 22 removed from the stack 12.

Die vorbeschriebene Anordnung läßt eine präzise Regelung der Andruckkraft des Blattstapels 12 gegen die Abzugsrollen 16 bei Gleichverteilung des Abzugsmoments auf alle Abzugsrollen zu. Dabei ist die Dicke des Blattstapels unerheblich. Die Auflösung des Meßsystems für die Andruckkraft wird dabei noch dadurch erhöht, daß die Auslenkung des Reflektors um das Längenverhältnis der durch die Antriebswelle 18 gebildeten Hebelarme verstärkt wird, die durch den Abstand zwischen den Lagern 21 und 64 bzw. zwischen dem Lager 21 und der Lagerkugel 50 definiert sind.The arrangement described above permits precise control of the pressing force of the sheet stack 12 against the take-off rollers 16 with equal distribution of the take-off torque to all the take-off rollers. The thickness of the sheet stack is irrelevant. The resolution of the measuring system for the pressing force is increased by the fact that the deflection of the reflector is increased by the length ratio of the lever arms formed by the drive shaft 18, which is caused by the distance between the bearings 21 and 64 or between the bearing 21 and the bearing ball 50 are defined.

Bei Entnahme der Kassette 14 sinkt die Spannung wieder auf den Wert U1, worauf die Steuereinrichtung 44 eine Statusmeldung "Kassette entnommen" abgibt.When the cassette 14 is removed, the voltage drops again to the value U 1 , whereupon the control device 44 issues a status message “cassette removed”.

Claims (8)

  1. Sheet-extracting device with a cassette (14) for receiving a stack of sheets (12) whose front end side is pressed, by means of a pressing device (13), with a pressing force against an extracting device (16, 18, 34), the extracting device being equipped with at least two extracting rollers (16) which are intended for butting against the sheet (22) to be extracted in each case and are arranged at an axial spacing from one another, the extracting rollers (16) being arranged on a tubular floating shaft (34) which, in its central section, is mounted with radial play, by means of a universal joint (48), on a drive shaft (18) passing through it in the longitudinal direction and mounted rotatably, by one end (20), in a frame-mounted bearing (21) and is connected to said drive shaft in a rotationally fixed manner, and the floating shaft (34) being guided adjustably between legs (30) of a guide fork (40) which are directed perpendicularly with respect to the sheet plane, characterized in that the other end (62) of the drive shaft (18) is mounted displaceably perpendicularly with respect to the sheet plane, in that the pressing device (13) can be displaced against the rear end side of the stack of sheets (12) by means of a pressing motor (46), in that the pressing force is determined by a spring (70) which acts on the displaceable end (62) of the drive shaft (18) and whose excursion displacement (d) is a measure of the pressing force, in that a displacement sensor (74, 76) for measuring the excursion displacement (d) of the spring (70) is provided in the vicinity of the displaceable end (62) of the drive shaft (18), in that the cassette (14) can be removed from the sheet-extracting device and fitted thereon, the drive shaft (18) assuming a first displacement position (t) when the cassette (14) has been removed and a second displacement position (u) when the cassette has been fitted, in that the displacement sensor (74, 76) has a measuring range in which it detects the absence and the presence of a cassette (14), and in that, in the direction of increasing excursion of the spring (70), the measuring range is adjoined by a further measuring range in which the displacement sensor (74, 76) measures the pressing force of the stack of sheets (12) on the extracting device and emits a signal for readjusting the pressing motor (46) in dependence on said pressing force.
  2. Device according to Claim 1, characterized in that a torque is introduced into the drive shaft (18) at the frame-mounted end (20) thereof.
  3. Device according to Claim 1 or 2, characterized in that the force of the spring (70) is proportional to the excursion displacement (d) at least over part of its excursion.
  4. Device according to one of Claims 1 to 3, characterized in that the displaceable end (62) of the drive shaft (18) is mounted in a displaceable bearing (64), and in that the displacement sensor comprises a reflection light barrier (76) and a reflector (74) which is fitted on the displaceable bearing (64) and whose surface normal is oriented in the displacement direction of the drive shaft.
  5. Device according to Claim 4, characterized in that the reflector (74) is planar and mirror-surfaced.
  6. Device according to Claim 4 or 5, characterized in that the reflector (74) is arranged at such a distance from the reflection light barrier (76) that the spot of light produced by the light transmitter (90) is imaged with high definition on the light receiver (92) and with dimensions which correspond approximately to the light-sensitive surface area of the light receiver (92).
  7. Device according to Claim 6, characterized in that the displacement of the reflector (74) causes a displacement-dependent change in the degree of illumination of the light receiver (92) and thus in the output voltage (U) thereof.
  8. Method of controlling the device according to one of Claims 1 to 7, the displacement sensor (74, 76) emitting a signal (U) which is proportional to the pressing force, characterized in that the signal value (U1) is determined when the pressing force has not yet been established, in that the pressing motor (46) is operated with the effect of increasing the pressing force until a maximum pressing force has been established, whereupon the associated signal value (U3) is determined, in that a mean value (UM) is calculated for these signal values (U1, U3), whereupon the pressing force is reduced to a value which corresponds to a signal value (U2) above the mean value (UM), said signal value (U2) being selected such that the mean value (UM) is reached after a predetermined number of sheets (22) has been extracted from the stack (12), and in that, after the signal value has dropped below the mean value (UM), the pressing motor (46) is actuated with the effect of increasing the pressing force until the higher signal value (U2) has been reached again.
EP95910432A 1994-03-14 1995-03-02 Sheet-removal arrangement having a cassette for holding a sheet stack Expired - Lifetime EP0751906B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4408551A DE4408551C2 (en) 1994-03-14 1994-03-14 Sheet removal device with a cassette for holding a stack of sheets
DE4408551 1994-03-14
PCT/DE1995/000274 WO1995025057A1 (en) 1994-03-14 1995-03-02 Sheet-removal arrangement having a cassette for holding a sheet stack

Publications (2)

Publication Number Publication Date
EP0751906A1 EP0751906A1 (en) 1997-01-08
EP0751906B1 true EP0751906B1 (en) 1997-11-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95910432A Expired - Lifetime EP0751906B1 (en) 1994-03-14 1995-03-02 Sheet-removal arrangement having a cassette for holding a sheet stack

Country Status (7)

Country Link
US (1) US5848786A (en)
EP (1) EP0751906B1 (en)
JP (1) JP3044131U (en)
BR (1) BR9507069A (en)
DE (2) DE4408551C2 (en)
ES (1) ES2109816T3 (en)
WO (1) WO1995025057A1 (en)

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JP4077245B2 (en) * 2002-05-28 2008-04-16 株式会社東芝 Paper sheet take-out device
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DE59501045D1 (en) 1998-01-08
DE4408551A1 (en) 1995-09-21
DE4408551C2 (en) 1998-02-19
US5848786A (en) 1998-12-15
BR9507069A (en) 1997-09-30
ES2109816T3 (en) 1998-01-16
EP0751906A1 (en) 1997-01-08
WO1995025057A1 (en) 1995-09-21
JP3044131U (en) 1997-12-16

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