EP0000366B1 - Sheet feeding device - Google Patents

Sheet feeding device Download PDF

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Publication number
EP0000366B1
EP0000366B1 EP78100292A EP78100292A EP0000366B1 EP 0000366 B1 EP0000366 B1 EP 0000366B1 EP 78100292 A EP78100292 A EP 78100292A EP 78100292 A EP78100292 A EP 78100292A EP 0000366 B1 EP0000366 B1 EP 0000366B1
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EP
European Patent Office
Prior art keywords
suction chamber
feeding device
shaft
cam
sheet feeding
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Expired
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EP78100292A
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German (de)
French (fr)
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EP0000366A1 (en
Inventor
Herbert Blum
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Hoechst AG
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Hoechst AG
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Publication of EP0000366A1 publication Critical patent/EP0000366A1/en
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    • 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
    • B65H3/08—Separating articles from piles using pneumatic force
    • B65H3/12—Suction bands, belts, or tables moving relatively to the pile
    • B65H3/122—Suction tables

Definitions

  • the invention relates to a sheet feed device for the automatic feeding of single sheets with a displaceable perforated plate from a stack to a device, with lower transport rollers and upper transport rollers which bear elastically against the transport rollers.
  • Such a sheet feed device is known from US Pat. No. 1,435,205, in which a perforated plate which is displaceable in the transport direction of the individual sheets of a stack is provided.
  • This perforated plate can be pushed back and forth in guides which are arranged on the lower edges of two opposite walls of a vacuum chamber.
  • the guides have enough play up and down so that the perforated plate can be moved up and down vertically.
  • the air is sucked out of the vacuum chamber via a pipe which is connected to a line which leads to the suction opening of a blower, a vacuum pump or another air suction device.
  • a fan is not provided in this known device.
  • US Pat. No. 3,226,108 relates to a sheet feed device having a cylindrical chamber which is arranged below a stacking table for the sheet or card material to be conveyed and has a bore which receives a piston which can be moved back and forth with a bore.
  • the front part of the piston carries a suction chamber with a perforated cover plate, which in its front position projects into a gap between an upper and a lower transport roller.
  • the bore of the piston communicates with a suction pump and with an opening leading to the atmosphere as it moves. Due to the vacuum in the piston, the material to be transported is held on the perforated cover plate during the forward movement and when the transport rollers and rollers reach the front edge of the material, this is released in that the vacuum is released.
  • a suction fan is known from US Pat. No. 3,610,577, which is seated on a plate in which a suction opening for the fan is made. This plate can only be moved vertically, but not in the horizontal direction.
  • U.S. Patent 2,859,964 describes a drive mechanism for pushing an intake manifold back and forth.
  • the drive mechanism includes a drive shaft that carries two pulleys of different diameters.
  • the smaller diameter pulley drives a transport roller via a drive belt, while the other pulley drives a shaft that carries a cam.
  • the shaft encloses a fork-like end of an arm which supports a sheet transport device which bears against the lower side of the sheet stack.
  • DE-OSen 2 026 063, 2 365 228 and 2 343 133 describe gripper devices which either have individual gripper fingers or a clamping strip with a number of gripper fingers or movable gripper jaws.
  • a conveying device for a copying machine in which the original to be copied is occasionally fed from a stack to a support surface of an exposure station by means of conveyor belts and then conveyed by conveyor belts to a storage stack.
  • a first switchable conveyor device takes over the separated original and feeds it to the support surface by means of a reversible belt conveyor device which is set in motion by a reversible drive device.
  • the known transport devices have in common a master drum, which is equipped with individually integrated gripper fingers or with a rigid gripper bar running over the drum surface, with the help of which the front edge of the original to be transported is held in place during the rotation of the master drum, or the template is transported by Conveyor belts.
  • the known transport devices mentioned are built-in components of a copying or reproducing device and, as such, are not suitable in terms of their construction and function as such for feeding originals from outside an input point of a device in which the originals are further processed.
  • the object of the invention is to provide a sheet feeding device with which an input point of a device can be fed exactly from a stack of single sheets, which can also have different weights, avoiding double and multiple feeding.
  • a displaceable in the transport direction of the individual sheets of a stack suction chamber consists of a cover plate and the perforated plate as a base plate that guide projections for the sheet to be transported are provided on the front of the suction chamber over the width of the sheet feeder, and that the cover plate is provided with a suction opening for a fan arranged thereon above the suction opening.
  • the guide projections lie tangentially on the lower edge of a shaft in the advanced position of the suction chamber. Furthermore lie the guide projections opposite the section of the shaft between two adjacent transport rollers or the section between a wall which laterally delimits the suction chamber and the adjacent transport roller.
  • the suction chamber is expediently limited laterally by the two vertical walls and can be moved between them.
  • Each wall has a slot running in the transport direction, in each of which a slide roller and a stop slide roller are guided, which extend laterally into the slots from the side walls of the suction chamber.
  • This configuration ensures that the suction chamber is guided along the slots via the sliding rollers and the stop sliding rollers, the forward movement of the suction chamber being limited by the stop sliding rollers as soon as they abut the ends of the slots.
  • a support rod running parallel to the support plate is connected at its ends to the walls and a spring is attached at one end to the support rod and at the other end to a bolt of the fan housing.
  • This spring serves as a return spring for the suction chamber moved in the transport direction.
  • One embodiment of the invention is designed such that a drive motor is fastened to the inside of one wall, the drive shaft being guided through the wall to the outside and carrying two toothed belt pulleys with different diameters, of which the larger toothed belt pulley drives a toothed belt pulley via a toothed belt, which sits on a common shaft with a gear drive, which sets the shaft arranged at the output of the sheet feed device with the transport rollers in motion, and that the smaller toothed belt pulley drives a toothed belt pulley via a toothed belt, which is fixedly connected to a cam on a shaft.
  • the cam bears against a cam roller, which sits on the outside of the wall on the same axis as the slide roller and, during one revolution, shifts the suction chamber over the cam roller against the tensile force of the spring in the transport direction once by a cam length.
  • This configuration ensures that the uppermost sheet of the stack sucked in by the fan is advanced so far in the transport direction that the front edge of this sheet is gripped by the transport rollers and transport rollers and transported further.
  • a drive motor is fastened to the inside of one wall, the drive shaft of which is guided through the wall and on which sits a toothed belt pulley which drives a belt drive, which acts as an endless toothed belt via a toothed belt pulley seated on the shaft with the transport rollers and is guided over a toothed belt pulley which is firmly connected to the cam.
  • This drive mechanism represents a structural simplification compared to the drive mechanism described above.
  • the advantages are achieved that the suction of a single sheet while feeding the same ensures a safe and trouble-free individual feed to a device such as a facsimile machine and that the ease of use of such a device is increased by the automatic loading.
  • Another advantage is that the sheet feeder to a facsimile machine can be reduced in cost by automatically sending during a low-fee period for the lines used by the facsimile machine for transmission without personnel, such as when the sheet feeder is used triggered automatically by a timer.
  • FIGS. 1 and 2 show a side and a front view of a sheet feed device 1 which has a suction chamber 3 which can be displaced in the transport direction A.
  • a fan 4 sits on a cover plate 22 of the suction chamber 3 in a fan housing 14 and is connected to the electrical power supply in a manner not shown.
  • a suction opening 21 for the fan 4 shown in FIG. 3 is provided in the cover plate 22.
  • the base plate of the suction chamber 3 is designed as a perforated plate 2, so that during operation of the fan 4 through the perforated plate 2, a constant air draft is directed upwards, which lifts the sheet 13 lying on top from a stack 16.
  • the suction chamber 3 has the shape of a flat box, which can be moved with its side walls between vertical walls 23, 24.
  • the walls 23, 24 form a right angle with a support plate 27 a, which receives the stack 16 of sheets 13, and are connected to this.
  • the length and the width of the support plate 27 are chosen according to the largest sheet format still to be processed.
  • the front or rear edge of the support plate 27 delimits a stop 11 or 11 '.
  • the stop 11 ' is usually arranged at a short distance in front of the rear edge of the support plate 27 and is tangent to the transport rollers 10.
  • the transport rollers 10 usually consist of an elastic material, such as rubber or the like, while the material for the transport rollers 9 is preferably an elastic foam.
  • the support plate 27 is longer than the walls 23, 24, seen in the transport direction A, is deep and extends beyond the walls 23, 24 to the front.
  • a cover 39 which can be provided with holes, for example, covers the sheet feed device 1 from above and also covers as a cover 37 a drive arrangement for the transport rollers 9 and a cam 5 which moves the suction chamber 3 in the transport direction A.
  • a start and a stop button are provided, between which a display, for example in the form of a lamp, is arranged which indicates the start of operation of the sheet feeder after the start button has been pressed and the end of the sheet feeder.
  • the perforated plate 2 of the suction chamber 3 is arranged at a certain distance from the support plate 27, which defines the height of the stack 16 that can be inserted into the sheet feeder 1.
  • a support rod 19 running parallel to the support plate 27 is provided, which is connected at its ends to the walls 23, 24. This can be done, for example, in such a way that the ends of the holding rod 19, which have threads, are passed through holes in the walls 23, 24 and are screwed onto the outer sides of the walls 23, 24 by means of nuts.
  • One end of a spring 7 is hooked onto the mounting rod 19, while the other end of the spring 7 is hooked onto a bolt 15 of the fan housing 14.
  • the spring 7, which runs slightly obliquely to the horizontal, works as a return spring for the suction chamber 3 and pulls it back into the starting position after the forward movement has taken place.
  • a drive motor 8 is provided on the inside of the wall 23, the drive shaft 29 (FIG. 2) of which is guided through the wall 23.
  • a toothed belt pulley 30 which drives a belt drive 17 which is guided as an endless toothed belt via a toothed belt pulley 36 seated on the shaft 38 with the transport rollers 9 and via a further toothed belt pulley 18 which is firmly connected to the cam 5 .
  • This drive arrangement can be seen in FIG. 1, in which the cover 37 shown in FIG. 2 has been removed.
  • the cam 5 is rotated, which bears against a cam roller 6 and, during one revolution, displaces the suction chamber 3 via the cam roller 6 against the tensile force of the spring 7 in the transport direction A by one cam length from the initial position.
  • the cam 5 bears against the cam roller 6, which slides forward in the slot 25 as long as the cam diameter becomes larger.
  • the diameter of the cam 5 resting against the cam roller 6 becomes smaller again, so that the spring 7 can pull the suction chamber 3 back into the starting position.
  • the transport rollers 9 are set in rotation with the movement of the suction chamber 3, which abut against the transport rollers 10 and together with them detect the leading edge of a fed sheet and, for example, convey it to the entry point of a remote copier (not shown).
  • guide projections 20 are provided for the sheet 13 to be transported across the width of the chamber, as the top view according to FIG. 3 shows. These guide projections 20 lie in the advanced position of the suction chamber 3 tangentially on the lower edge of the shaft 38 and ensure an exact grasping and drawing in of the transported sheet by the transport rollers 9 and the transport rollers 10.
  • two transport rollers are shown, but can more than two transport rollers or a single continuous transport roller can also be provided.
  • the guide projections 20 lie opposite the section of the shaft 38 between two adjacent transport rollers 9 or the section between the wall 23 or 24 and the adjacent transport roller 9. This ensures that during the forward movement of the suction chamber 3, the guide projections 20 each have space between two transport rollers 9 or a transport roller 9 and the wall 23 or 24.
  • the suction chamber 3 is guided between the walls 23, 24 in the exemplary embodiment shown in FIGS. 1 to 3 in such a way that a groove 41 extending over the entire length of the wall is provided on the inside of each wall 23, 24 is, with each groove two castors 42 (see Fig. 2 and 3) are engaged.
  • the casters 42 are hori stored zonally between the walls 23, 24 and recesses in the side walls of the suction chamber 3 and ensure an almost smooth movement of the suction chamber 3.
  • each wall 23, 24 has a slot 25, which runs parallel to the support plate 27 and is shorter than the adjacent side wall of the suction chamber 3.
  • Two shafts protrude from the side walls of the suction chamber 3, on which a slide roller 26 and a stop slide roller 28 are seated, which engage in the slots 25 of the walls 23, 24.
  • the stop slide roller 28 limits the forward movement of the suction chamber 3 as soon as it bears against the rear end of the slot 25.
  • a cam roller 5 is seated on the shaft 35 on the outside of the wall 23.
  • a drive motor 8 is also attached to the inside of the wall 23, the drive shaft 29 of which is guided through the wall 23 to the outside.
  • the gear drive 34 consists of two gear wheels, which are connected to one another by a self-contained endless gear chain. The gear drive sets the shaft arranged at the output of the sheet feed device 1 in motion with the transport rollers 9.
  • the smaller toothed belt pulley 31 on the drive shaft 29 drives a toothed belt pulley 40 via a toothed belt 33, which is fixedly connected to the cam 5 on the shaft 35. Due to the rotation of the cam 5, the suction chamber 3 is moved in the manner already described above.
  • a first sheet 13 has been gripped by the stacks 16 by the transport rollers 9 and the transport rollers 10 and has been conveyed to the feed rollers of a downstream device, not shown.
  • the first sheet still partially covers the perforated plate of the suction chamber 3.
  • a second sheet of the stack 16 is sucked in by the uncovered part of the perforated plate of the suction chamber and shows a curved course.
  • the suction chamber 3 is still in its initial position.
  • the suction force of the fan 4 on the second sheet is approximately 70% of the full suction force and increases continuously as the first sheet progresses into the downstream device.
  • the second sheet is more or less curved. Due to the continuously increasing suction power of the fan on the second sheet and the weight of an approximately subsequent third sheet, a separation effect is achieved between these two sheets, which prevents double or multiple feeding of sheets with certainty.
  • the sheet 13 completely covers the perforated plate of the suction chamber 3 and the cam 5 begins to rotate and to shift the slide roller in the transport direction A, as a result of which the suction chamber 3 is moved.
  • the perforated plate ensures a largely wide-area suction with approximately laminar flow, whereby the covering of the edge zones prevents unwanted air vortices that can lead to double or multiple feeding of sheets.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Description

Die Erfindung betrifft eine Blattzufuhrvorrichtung für die automatische Zuführung von Einzelblättern mit einer verschiebbaren Lochplatte von einem Stapel zu einem Gerät, mit unteren Transportwalzen und oberen Transportrollen, die gegen die Transportwalzen elastisch anliegen.The invention relates to a sheet feed device for the automatic feeding of single sheets with a displaceable perforated plate from a stack to a device, with lower transport rollers and upper transport rollers which bear elastically against the transport rollers.

Eine derartige Blattzufuhrvorrichtung ist aus dem US-Patent 1 435 205 bekannt, bei der eine in Transportrichtung der einzelnen Blätter eines Stapels verschiebbare Lochplatte vorgesehen ist. Diese Lochplatte ist in Führungen hin- und herverschiebbar, die an den unteren Kanten zweier sich gegenüberliegender Wände einer Vakuumkammer angeordnet sind. Die Führungen besitzen genügend Spiel nach oben und nach unten, so daß die Lochplatte vertikal auf- und abbewegt werden kann. Das Absaugen der Luft aus der Vakuumkammer erfolgt über ein Rohr, das mit einer Leitung verbunden ist, welche zu der Ansaugöffnung eines Geblases, einer Vakuumpumpe oder einer sonstigen Luftabsaugeeinrichtung führt. Ein Lüfter ist bei dieser bekannten Vorrichtung nicht vorgesehen.Such a sheet feed device is known from US Pat. No. 1,435,205, in which a perforated plate which is displaceable in the transport direction of the individual sheets of a stack is provided. This perforated plate can be pushed back and forth in guides which are arranged on the lower edges of two opposite walls of a vacuum chamber. The guides have enough play up and down so that the perforated plate can be moved up and down vertically. The air is sucked out of the vacuum chamber via a pipe which is connected to a line which leads to the suction opening of a blower, a vacuum pump or another air suction device. A fan is not provided in this known device.

Die US-Patentschrift 3 226 108 betrifft eine Blattzufuhrvorrichtung mit einer zylinderförmigen Kammer, die unterhalb eines Stapeltisches für das zu fördernde Blatt- oder Kartenmaterial angeordnet ist und eine Bohrung aufweist, die einen vor- und zurückverfahrbaren Kolben mit einer Ausbohrung aufnimmt. Der Vorderteil des Kolbens trägt eine Ansaugkammer mit einer gelochten Deckplatte, die in ihrer vorderen Position in einen Spalt zwischen einer oberen und einer unteren Transportrolle hineinragt. Die Ausbohrung des Kolbens steht bei dessen Bewegung der Reihe nach mit einer Absaugpumpe und mit einer zur Atmosphäre hinführenden Öffnung in Verbindung. Durch den Unterdruck im Kolben wird das zu transportierende Material auf der gelochten Deckplatte während der Vorwärtsbewegung festgehalten und beim Erreichen der Transportrollen und -walzen durch die Vorderkante des Materials wird dieses dadurch freigegeben, daß der Unterdruck aufgehoben wird.US Pat. No. 3,226,108 relates to a sheet feed device having a cylindrical chamber which is arranged below a stacking table for the sheet or card material to be conveyed and has a bore which receives a piston which can be moved back and forth with a bore. The front part of the piston carries a suction chamber with a perforated cover plate, which in its front position projects into a gap between an upper and a lower transport roller. The bore of the piston communicates with a suction pump and with an opening leading to the atmosphere as it moves. Due to the vacuum in the piston, the material to be transported is held on the perforated cover plate during the forward movement and when the transport rollers and rollers reach the front edge of the material, this is released in that the vacuum is released.

Aus der US-Patentschrift 3 610 577 ist ein Sauggebläse bekannt, das auf einer Platte aufsitzt, in der eine Ansaugöffnung für das Gebläse angebracht ist. Diese Platte ist nur vertikal verschiebbar, nicht jedoch in horizontaler Richtung.A suction fan is known from US Pat. No. 3,610,577, which is seated on a plate in which a suction opening for the fan is made. This plate can only be moved vertically, but not in the horizontal direction.

Die US-Patentschrift 2 859 964 beschreibt einen Antriebsmechanismus zum Hin- und Herverschieben eines Ansaugstutzens. Der Antriebsmechanismus umfaßt eine Antriebswelle, die zwei Riemenscheiben mit unterschiedlichen Durchmessern trägt. Die Riemenscheibe mit kleinerem Durchmesser treibt über einen Treibriemen eine Transportrolle an, während die andere Riemenscheibe eine Welle antreibt, die einen Nocken trägt. Die Welle umschließt ein gabelartig ausgebildetes Ende eines Arms, der eine Blattransporteinrichtung abstützt, die gegen die untere Seite des Blattstapels anliegt.U.S. Patent 2,859,964 describes a drive mechanism for pushing an intake manifold back and forth. The drive mechanism includes a drive shaft that carries two pulleys of different diameters. The smaller diameter pulley drives a transport roller via a drive belt, while the other pulley drives a shaft that carries a cam. The shaft encloses a fork-like end of an arm which supports a sheet transport device which bears against the lower side of the sheet stack.

Für Kopier- und Reproduktionsmaschinen sind schon verschiedene Transportvorrichtungen zum Fördern einer Vorlage durch die Bearbeitungsstationen bekannt. So beschreiben die DE-OSen 2 026 063, 2 365 228 und 2 343 133 Greifervorrichtungen, die entweder einzelne Greiferfinger oder eine Klemmleiste mit einer Anzahl von Greiferfingern bzw. bewegliche Greiferbacken aufweisen.Various transport devices for conveying an original through the processing stations are already known for copying and reproduction machines. DE-OSen 2 026 063, 2 365 228 and 2 343 133 describe gripper devices which either have individual gripper fingers or a clamping strip with a number of gripper fingers or movable gripper jaws.

Aus der DE-AS 1 902 112 ist eine Fördervorrichtung für eine Kopiermaschine bekannt, bei der das zu kopierende Original von einem Stapel vereinzelt einer Auflagefläche einer Belichtungsstation mittels Transportbändern zugeführt und anschließend von Transportbändern gefördert auf einen Ablagestapel abgelegt wird. Hierzu übernimmt eine erste schaltbare Fördervorrichtung das vereinzelte Original und führt es der Auflagefläche mittels einer umsteuerbaren Bandfördervorrichtung zu, die von einer umsteuerbaren Antriebsvorrichtung in Bewegung gesetzt wird.From DE-AS 1 902 112 a conveying device for a copying machine is known, in which the original to be copied is occasionally fed from a stack to a support surface of an exposure station by means of conveyor belts and then conveyed by conveyor belts to a storage stack. For this purpose, a first switchable conveyor device takes over the separated original and feeds it to the support surface by means of a reversible belt conveyor device which is set in motion by a reversible drive device.

Den bekannten Transportvorrichtungen ist eine Vorlagentrommel gemeinsam, die mit einzeln integrierten Greiferfingern oder mit einer über die Trommelfläche verlaufenden starren Greiferleiste ausgerüstet ist, mit deren Hilfe die Vorderkante des zu transportierenden Originals während der Drehung der Vorlagentrommel festgehalten wird, bzw. erfolgt der Transport der Vorlage mittels Transportbändern.The known transport devices have in common a master drum, which is equipped with individually integrated gripper fingers or with a rigid gripper bar running over the drum surface, with the help of which the front edge of the original to be transported is held in place during the rotation of the master drum, or the template is transported by Conveyor belts.

Die erwähnten bekannten Transportvorrichtungen sind festeingebaute Bestandteile eines Kopier- oder Reproduktionsgerätes und als solche von ihrer Bauweise und Funktion her nicht geeignet, Vorlagen von außerhalb einer Eingabestelle eines Gerätes, in dem die Vorlagen weiterverarbeitet werden, zuzuführen.The known transport devices mentioned are built-in components of a copying or reproducing device and, as such, are not suitable in terms of their construction and function as such for feeding originals from outside an input point of a device in which the originals are further processed.

Aufgabe der Erfindung ist es, eine Blattzfuhrvorrichtung zu schaffen, mit der von einem Stapel Einzelblätter, die auch unterschiedliches Gewicht haben können, unter Vermeidung von Doppel- und Mehrfacheinzug, einer Eingabestelle eines Geräts exakt zuführbar sind.The object of the invention is to provide a sheet feeding device with which an input point of a device can be fed exactly from a stack of single sheets, which can also have different weights, avoiding double and multiple feeding.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß eine in Transportrichtung der einzelnen Blätter eines Stapels verschiebbare Ansaugkammer aus einer Deckplatte und der Lochplatte als Grundplatte besteht, daß an der Vorderseite der Ansaugkammer über die Breite der Blattzufuhrvorrichtung Führungsvorsprünge für das zu transportierende Blatt vorgesehen sind, und daß die Deckplatte mit einer Ansaugöffnung für einen auf ihr über der Ansaugöffnung angeordneten Lüfter versehen ist.This object is achieved in that a displaceable in the transport direction of the individual sheets of a stack suction chamber consists of a cover plate and the perforated plate as a base plate that guide projections for the sheet to be transported are provided on the front of the suction chamber over the width of the sheet feeder, and that the cover plate is provided with a suction opening for a fan arranged thereon above the suction opening.

In Ausgestaltung der Erfindung liegen die Fürungsvorsprünge in der vorgeschobenen Stellung der Ansaugkammer tangential an der Unterkante einer Welle an. Des weiteren liegen die Führungsvorsprünge dem Abschnitt der Welle zwischen zwei benachbarten Transportrollen bzw. dem Abschnitt zwischen einer Wand, die die Ansaugkammer seitlich begrenzt, und der angrenzenden Transportrolle gegenüber.In an embodiment of the invention, the guide projections lie tangentially on the lower edge of a shaft in the advanced position of the suction chamber. Furthermore lie the guide projections opposite the section of the shaft between two adjacent transport rollers or the section between a wall which laterally delimits the suction chamber and the adjacent transport roller.

Die Ansaugkammer ist zweckmäßigerweise von den zwei senkrechten Wänden seitlich begrenzt und zwischen diesen verschiebbar. Jede Wand weist einen in Transportrichtung verlaufenden Schlitz auf, in dem je eine Gleitrolle und eine Anschlag-Gleitrolle geführt sind, die sich von den Seitenwänden der Ansaugkammer seitlich in die Schlitze erstrecken. Durch diese Ausgestaltung wird erreicht, daß die Ansaugkammer über die Gleitrollen und die Anschlag-Gleitrollen längs der Schlitze geführt wird, wobei die Vorwärts bewegung der Ansaugkammer durch die Anschlag-Gleitrollen begrenzt wird, sobald diese gegen die Enden der Schlitze anliegen.The suction chamber is expediently limited laterally by the two vertical walls and can be moved between them. Each wall has a slot running in the transport direction, in each of which a slide roller and a stop slide roller are guided, which extend laterally into the slots from the side walls of the suction chamber. This configuration ensures that the suction chamber is guided along the slots via the sliding rollers and the stop sliding rollers, the forward movement of the suction chamber being limited by the stop sliding rollers as soon as they abut the ends of the slots.

In zweckmäßiger Weise ist eine zur Auflageplatte parallel verlaufende Halterungsstange mit ihren Enden mit den Wänden verbunden und eine Feder mit einem Ende an der Halterungsstange und mit dem anderen Ende an einem Bolzen des Lüftergehäuses eingehängt. Diese Feder dient als Rückholfeder für die in Transportrichtung verfahrene Ansaugkammer. Eine Ausführungsform der Erfindung ist so ausgestaltet, daß an der Innenseite der einen Wand ein Antriebsmotor befestigt ist, -dessen Antriebswelle durch die Wand nach außen geführt ist und zwei Zahnriemenscheiben mit unterschiedlichen Durchmessern trägt, von denen die größere Zahnriemenscheibe über einen Zahnriemen eine Zahnriemenscheibe antreibt, die auf einer gemeinsamen Welle mit einem Zahnradantrieb aufsitzt, der die am Ausgang der Blattzufuhrvorrichtung angeordnete Welle mit den Transportrollen in Bewegung versetzt, und daß die kleinere Zahnriemenscheibe über einen Zahnriemen eine Zahnriemenscheibe antreibt, die mit einem Nocken fest verbunden auf einer Welle aufsitzt. Der Nocken liegt zwechmäßigerweise gegen eine Nockenrolle an, die an der Außenseite der Wand auf der gleichen Achse wie die Gleitrolle aufsitzt und verschiebt während einer Umdrehung die Ansaugkammer über die Nockenrolle gegen die Zugkraft der Feder in Transportrichtung einmal um eine Nockenlänge. Durch diese Ausgestaltung wird erreicht, daß das vom Lüfter angesaugte oberste Blatt des Stapels in Transportrichtung so weit vorgeschoben wird, daß die Vorderkante dieses Blattes von den Transportrollen und Transportwalzen erfaßt und weitertransportiert wird.Advantageously, a support rod running parallel to the support plate is connected at its ends to the walls and a spring is attached at one end to the support rod and at the other end to a bolt of the fan housing. This spring serves as a return spring for the suction chamber moved in the transport direction. One embodiment of the invention is designed such that a drive motor is fastened to the inside of one wall, the drive shaft being guided through the wall to the outside and carrying two toothed belt pulleys with different diameters, of which the larger toothed belt pulley drives a toothed belt pulley via a toothed belt, which sits on a common shaft with a gear drive, which sets the shaft arranged at the output of the sheet feed device with the transport rollers in motion, and that the smaller toothed belt pulley drives a toothed belt pulley via a toothed belt, which is fixedly connected to a cam on a shaft. The cam bears against a cam roller, which sits on the outside of the wall on the same axis as the slide roller and, during one revolution, shifts the suction chamber over the cam roller against the tensile force of the spring in the transport direction once by a cam length. This configuration ensures that the uppermost sheet of the stack sucked in by the fan is advanced so far in the transport direction that the front edge of this sheet is gripped by the transport rollers and transport rollers and transported further.

Bei einer anderen Ausführungsform der Erfindung ist an der Innenseite der einen Wand ein Antriebsmotor befestigt, dessen Antriebswelle durch die Wand hindurchgeführt ist und auf der eine Zahnriemenscheibe aufsitzt, die einen Bandantrieb antreibt, der als endloser Zahnriemen über eine auf der Welle mit den Transportrollen aufsitzenden Zahnriemenscheibe und über eine Zahnriemenscheibe geführt ist, die mit dem Nocken fest verbunden ist. Dieser Antriebsmechanismus stellt gegenüber dem vorbeschriebenen Antriebsmechanismus eine bauliche Vereinfachung dar.In another embodiment of the invention, a drive motor is fastened to the inside of one wall, the drive shaft of which is guided through the wall and on which sits a toothed belt pulley which drives a belt drive, which acts as an endless toothed belt via a toothed belt pulley seated on the shaft with the transport rollers and is guided over a toothed belt pulley which is firmly connected to the cam. This drive mechanism represents a structural simplification compared to the drive mechanism described above.

Mit der Erfindung werden die Vorteile erzielt, daß das Ansaugen eines einzelnen Blattes bei gleichzeitigem Vorschub desselben eine sichere und störungsfreie Einzelzufuhr zu einem Gerät, wie beispielsweise einem Fernkopierer gewährleistet und daß durch die automatische Beschickung die Bedienungsfreundlichkeit eines solchen Gerätes erhöht wird. Als weiterer Vorteil Kommt hinzu, daß bei der Blattzufuhr zu einem Fernkopierer eine Kostensenkung in der Weise erzielt werden kann, daß während einer Zeit mit niedrigen Gebühren für die von dem Fernkopierer für die Übertragung benutzten Leitungen ohne Personaleinsatz automatisch gesendet werden kann, wenn die Blattzufuhrvorrichtung beispielsweise über ein Zeitwerk automatisch ausgelöst wird.With the invention, the advantages are achieved that the suction of a single sheet while feeding the same ensures a safe and trouble-free individual feed to a device such as a facsimile machine and that the ease of use of such a device is increased by the automatic loading. Another advantage is that the sheet feeder to a facsimile machine can be reduced in cost by automatically sending during a low-fee period for the lines used by the facsimile machine for transmission without personnel, such as when the sheet feeder is used triggered automatically by a timer.

Die Erfindung wird im folgenden anhand von zeichnerisch dargestellten Ausführungsbeispielen näher erläutert.The invention is explained in more detail below with reference to exemplary embodiments illustrated in the drawings.

Es zeigen:

  • Fig. 1 eine schematische Seitenansicht einer Blattzufuhrvorrichtung,
  • Fig. 2 eine schematische Vorderansicht der Blattzufuhrvorrichtung nach Fig. 1,
  • Fig. 3 eine Draufsicht auf die Blattzufuhrvorrichtung mit teilweiser Durchsicht auf eine Lochplatte einer Ansaugkammer der Vorrichtung,
  • Fig. 4 eine Seitenansicht einer weiteren Ausführungsform der Blattzufuhrvorrichtung ähnlich der Ausführungsform nach Fig. 1 mit gegenüber dieser Ausführungsform verändertem Antriebssystem,
  • Fig. 5a, 5b und 5c in schematischer Darstellung drei Bewegungsabläufe während des Ansaugens und des Weitertransports eines Blattes durch die Blattzufuhrvorrichtung.
Show it:
  • 1 is a schematic side view of a sheet feeding device,
  • FIG. 2 shows a schematic front view of the sheet feed device according to FIG. 1, FIG.
  • 3 is a plan view of the sheet feeding device with a partial view of a perforated plate of a suction chamber of the device,
  • FIG. 4 shows a side view of a further embodiment of the sheet feed device similar to the embodiment according to FIG. 1 with a drive system modified compared to this embodiment,
  • 5a, 5b and 5c in a schematic representation three movements during the suction and the further transport of a sheet through the sheet feeder.

Figuren 1 und 2 zeigen eine Seiten- bzw. eine Vorderansicht einer Blattzufuhrvorrichtung 1, die eine in Transportrichtung A verschiebbare Ansaugkammer 3 aufweist. Auf einer Deckplatte 22 der Ansaugkammer 3 sitzt in einem Lüftergehäuse 14 ein Lüfter 4 auf, der in nicht dargestellter Weise an die elektrische Stromversorgung angeschlossen ist.FIGS. 1 and 2 show a side and a front view of a sheet feed device 1 which has a suction chamber 3 which can be displaced in the transport direction A. A fan 4 sits on a cover plate 22 of the suction chamber 3 in a fan housing 14 and is connected to the electrical power supply in a manner not shown.

In der Deckplatte 22 ist eine in Fig. 3 gezeigte Ansaugöffnung 21 für den Lüfter 4 vorgesehen. Die Grundplatte der Ansaugkammer 3 ist als Lochplatte 2 ausgebildet, so daß während des Betriebes des Lüfters 4 durch die Lochplatte 2 hindurch ein steter Luftzug nach oben gerichtet ist, der das zuoberst liegende Blatt 13 von einem Stapel 16 abhebt.A suction opening 21 for the fan 4 shown in FIG. 3 is provided in the cover plate 22. The base plate of the suction chamber 3 is designed as a perforated plate 2, so that during operation of the fan 4 through the perforated plate 2, a constant air draft is directed upwards, which lifts the sheet 13 lying on top from a stack 16.

Die Ansaugkammer 3 hat die Gestalt einer flachen Schachtel, die mit ihren Seitenwänden zwischen senkrechten Wänden 23,24 verschiebbar ist. Die Wände 23,24 schliessen einen rechten Winkel mit einer Auflageplatte 27 ein, die den Stapel 16 von Blättern 13 aufnimmt, und sind mit dieser verbunden. Die Länge und die Breite der Auflageplatte 27 wird entsprechend dem größten, noch zu verarbeitenden Blattformat gewählt. Die Vorder- bzw. Hinterkante der Auflageplatte 27 begrenzt ein Anschlag 11 bzw. 11'. Der Anschlag 11' ist üblicherweise im geringen Abstand vor der Hinterkante der Auflageplatte 27 angeordnet und liegt tangential an Transportwalzen 10 an. Oberhalb dieser Transportwalzen 10 befindet sich eine Welle 38, auf der in Abständen Transportrollen 9 angeordnet sind, die gegen die Transportwalzen 10 anliegen. Die Transportwalzen 10 bestehen üblicherweise aus einem elastischen Material, wie Gummi oder dgl., während das Material für die Transportrollen 9 bevorzugt ein elastischer Schaumstoff ist.The suction chamber 3 has the shape of a flat box, which can be moved with its side walls between vertical walls 23, 24. The walls 23, 24 form a right angle with a support plate 27 a, which receives the stack 16 of sheets 13, and are connected to this. The length and the width of the support plate 27 are chosen according to the largest sheet format still to be processed. The front or rear edge of the support plate 27 delimits a stop 11 or 11 '. The stop 11 'is usually arranged at a short distance in front of the rear edge of the support plate 27 and is tangent to the transport rollers 10. Above these transport rollers 10 there is a shaft 38 on which transport rollers 9 are arranged at intervals, which bear against the transport rollers 10. The transport rollers 10 usually consist of an elastic material, such as rubber or the like, while the material for the transport rollers 9 is preferably an elastic foam.

Die Auflageplatte 27 ist länger als die Wände 23,24, in Transportrichtung A gesehen, tief sind und erstreckt sich über die Wände 23,24 hinaus nach vorne.The support plate 27 is longer than the walls 23, 24, seen in the transport direction A, is deep and extends beyond the walls 23, 24 to the front.

Eine Verkleidung 39, die beispielsweise mit Löchern versehen sein kann, deckt die Blattzufuhrvorrichtung 1 von oben ab und umschleißt ferner als Abdeckung 37 noch eine Antriebsanordnung für die Transportrollen 9 und einen Nocken 5, der die Ansaugkammer 3 in Transportrichtung A verschiebt.A cover 39, which can be provided with holes, for example, covers the sheet feed device 1 from above and also covers as a cover 37 a drive arrangement for the transport rollers 9 and a cam 5 which moves the suction chamber 3 in the transport direction A.

An der Vorderseite der Blattzufuhrvorrichtung 1 sind eine Start- und eine Stopptaste vorgesehen, zwischen denen eine Anzeige, beispielsweise in Form einer Lampe, angeordnet ist, die den Betriebsbeginn der Blattzufuhrvorrichtung nach dem Drücken der Starttaste und das Ende der Blattzufuhr anzeigt.On the front of the sheet feeder 1, a start and a stop button are provided, between which a display, for example in the form of a lamp, is arranged which indicates the start of operation of the sheet feeder after the start button has been pressed and the end of the sheet feeder.

Die Lochplatte 2 der Ansaugkammer 3 ist von der Auflageplatte 27 in einem bestimmten Abstand angeordnet, der die Höhe des in die Blattzufuhrvorrichtung 1 einlegbaren Stapels 16 festlegt.The perforated plate 2 of the suction chamber 3 is arranged at a certain distance from the support plate 27, which defines the height of the stack 16 that can be inserted into the sheet feeder 1.

Oberhalb des Lüfters 4 und in Transportrichtung A gesehen vor diesem ist eine zur Auflageplatte 27 parallel verlaufende Halterungsstange 19 vorgesehen, die mit ihren Enden mit den Wänden 23,24 verbunden ist. Dies kann beispielsweise in der Form geschehen, daß die Enden der Halterungsstange 19, die Gewinde aufweisen, durch Löcher in den Wänden 23,24 hindurchgeführt sind und an den Außenseiten der Wände 23,24 mittels Muttern verschraubt werden. Ein Ende einer Feder 7 ist an der Halterungsstange 19 eingehängt, während das andere Ende der Feder 7 an einen Bolzen 15 des Lüftergehäuses 14 eingehängt ist. Die leicht schräg zur Horizontalen verlaufende Feder 7 arbeitet als Rückholfeder für die Ansaugkammer 3 und zieht diese nach erfolgter Vorwärtsbewegung wieder in die Ausgangsstellung zurück.Above the fan 4 and seen in the transport direction A in front of this, a support rod 19 running parallel to the support plate 27 is provided, which is connected at its ends to the walls 23, 24. This can be done, for example, in such a way that the ends of the holding rod 19, which have threads, are passed through holes in the walls 23, 24 and are screwed onto the outer sides of the walls 23, 24 by means of nuts. One end of a spring 7 is hooked onto the mounting rod 19, while the other end of the spring 7 is hooked onto a bolt 15 of the fan housing 14. The spring 7, which runs slightly obliquely to the horizontal, works as a return spring for the suction chamber 3 and pulls it back into the starting position after the forward movement has taken place.

Für die Bewegung der Ansaugkammer 3 ist an der Innenseite der Wand 23 ein Antriebsmotor 8 vorgesehen, dessen Antriebswelle 29 (Fig. 2) durch die Wand 23 hindurchgeführt ist. Auf der Antriebswelle 29 sitzt eine Zahnriemenscheibe 30 auf, die einen Bandantrieb 17 antreibt, der als endloser Zahnriemen über eine auf der Welle 38 mit den Transportrollen 9 aufsitzenden Zahnriemenscheibe 36 und über eine weitere Zahnriemenscheibe 18 geführt ist, die mit dem Nocken 5 fest verbunden ist. Diese Antriebsanordnung ist aus Fig. 1 ersichtlich, bei der die in Fig. 2 dargestellte Abdeckung 37 entfernt wurde.For the movement of the suction chamber 3, a drive motor 8 is provided on the inside of the wall 23, the drive shaft 29 (FIG. 2) of which is guided through the wall 23. On the drive shaft 29 there is a toothed belt pulley 30 which drives a belt drive 17 which is guided as an endless toothed belt via a toothed belt pulley 36 seated on the shaft 38 with the transport rollers 9 and via a further toothed belt pulley 18 which is firmly connected to the cam 5 . This drive arrangement can be seen in FIG. 1, in which the cover 37 shown in FIG. 2 has been removed.

Sobald die Blattzufuhrvorrichtung 1 eingeschaltet ist, d.h. der Antriebsmotor 8 läuft, wird der Nocken 5 gedreht, der gegen eine Nockenrolle 6 anliegt und während einer Umdrehung die Ansaugkammer 3 über die Nockenrolle 6 gegen die Zugkraft der Feder 7 in Transportrichtung A um eine Nockenlänge aus der Ausgangsstellung verschiebt. Während der Umdrehung liegt der Nocken 5 gegen die Nockenrolle 6 an, die im Schlitz 25 solange vorwärtsgleitet, als der Nockendurchmesser größer wird. Während seiner Drehung wird der an der Nockenrolle 6 anliegende Durchmesser des Nockens 5 wieder kleiner, so daß die Feder 7 die Ansaugkammer 3 wieder in die Ausgangsstellung zurückziehen kann. Von der Antriebsanordunung werden gleichzeitig mit der Bewegung der Ansaugkammer 3 die Transportrollen 9 in Drehung vertsetzt, die gegen die Transportwalzen 10 anliegen und mit diesen zusammen die Vorderkante eines zugeführten Blattes erfassen und beispielsweise zu der Eingabestelle eines nichtdargestellten, nachgeschalteten Fernkopierers befördern.Once the sheet feeder 1 is turned on, i.e. the drive motor 8 is running, the cam 5 is rotated, which bears against a cam roller 6 and, during one revolution, displaces the suction chamber 3 via the cam roller 6 against the tensile force of the spring 7 in the transport direction A by one cam length from the initial position. During the rotation, the cam 5 bears against the cam roller 6, which slides forward in the slot 25 as long as the cam diameter becomes larger. During its rotation, the diameter of the cam 5 resting against the cam roller 6 becomes smaller again, so that the spring 7 can pull the suction chamber 3 back into the starting position. From the drive arrangement, the transport rollers 9 are set in rotation with the movement of the suction chamber 3, which abut against the transport rollers 10 and together with them detect the leading edge of a fed sheet and, for example, convey it to the entry point of a remote copier (not shown).

An der Vorderseite der Ansaugkammer 3 sind über die Breite der Kammer Führungsvorsprünge 20 für das zu transportierende Blatt 13 vorgesehen, wie die Draufsicht nach Fig. 3 zeigt. Diese Führungsvorsprünge 20 liegen in der vorgeschobenen Stellung der Ansaugkammer 3 tangential an der Unterkante der Welle 38 an und gewährleisten ein exaktes Erfassen und Einziehen des transportierten Blattes durch die Transportrollen 9 und die Transportwalzen 10. In den Ausführungsbeispielen der Erfindung sind zwei Transportwalzen dargestellt, jedoch können auch mehr als zwei Transportwalzen oder eine einzige durchgehende Transportwalze vorgesehen sein.On the front of the suction chamber 3, guide projections 20 are provided for the sheet 13 to be transported across the width of the chamber, as the top view according to FIG. 3 shows. These guide projections 20 lie in the advanced position of the suction chamber 3 tangentially on the lower edge of the shaft 38 and ensure an exact grasping and drawing in of the transported sheet by the transport rollers 9 and the transport rollers 10. In the exemplary embodiments of the invention, two transport rollers are shown, but can more than two transport rollers or a single continuous transport roller can also be provided.

Die Führungsvorsprünge 20 liegen dem Abschnitt der Welle 38 zwischen zwei benachbarten Transportrollen 9 bzw. dem Abschnitt zwischen der Wand 23 bzw. 24 und der angrenzenden Transportrolle 9 gegenüber. Dadurch ist sichergestellt, daß bei der Vorwärtsbewegung der Ansaugkammer 3 die Führungsvorsprünge 20 jeweils zwischen zwei Transportrollen 9 bzw. einer Transportrolle 9 und der Wand 23 bzw. 24 Platz finden.The guide projections 20 lie opposite the section of the shaft 38 between two adjacent transport rollers 9 or the section between the wall 23 or 24 and the adjacent transport roller 9. This ensures that during the forward movement of the suction chamber 3, the guide projections 20 each have space between two transport rollers 9 or a transport roller 9 and the wall 23 or 24.

Die Führung der Ansaugkammer 3 zwischen den Wänden 23,24 erfolgt bei dem Ausführungsbeispiel, das in den Fig. 1 bis 3 gezeigt ist, in der Weise, daß an der Innenseite jeder Wand 23,24 eine über die Gesamtlänge der Wand verlaufende Nut 41 vorgesehen ist, wobei mit jeder Nut je zwei Gleitrollen 42 (s. Fig. 2 und 3) in Eingriff stehen. Die Gleitrollen 42 sind horizontal zwischen den Wänden 23,24 und Ausnehmungen der Seitenwände der Ansaugkammer 3 gelagert und sorgen für eine nahezu reibungslose Bewegung der Ansaugkammer 3.The suction chamber 3 is guided between the walls 23, 24 in the exemplary embodiment shown in FIGS. 1 to 3 in such a way that a groove 41 extending over the entire length of the wall is provided on the inside of each wall 23, 24 is, with each groove two castors 42 (see Fig. 2 and 3) are engaged. The casters 42 are hori stored zonally between the walls 23, 24 and recesses in the side walls of the suction chamber 3 and ensure an almost smooth movement of the suction chamber 3.

Bei der Ausführungsform nach Fig. 4 weist jede Wand 23,24 einen parallel zur Auflageplatte 27 verlaufenden Schlitz 25 auf, der kürzer als die angrenzende Seitenwand der Ansaugkammer 3 ist. Von den Seitenwänden der Ansaugkammer 3 stehen je zwei Wellen ab, auf denen eine Gleitrolle 26 und eine Anschlag-Gleitrolle 28 aufsitzen, die in die Schlitze 25 der Wände 23,24 eingreifen. Die Anschlag-Gleitrolle 28 begrenzt die Vorwärtsbewegung der Ansaugkammer 3, sobald sie gegen das hintere Ende des Schlitzes 25 anliegt. An der Außenseite der Wand 23 sitzt auf der Welle 35 eine Nockenrolle 5 auf.In the embodiment according to FIG. 4, each wall 23, 24 has a slot 25, which runs parallel to the support plate 27 and is shorter than the adjacent side wall of the suction chamber 3. Two shafts protrude from the side walls of the suction chamber 3, on which a slide roller 26 and a stop slide roller 28 are seated, which engage in the slots 25 of the walls 23, 24. The stop slide roller 28 limits the forward movement of the suction chamber 3 as soon as it bears against the rear end of the slot 25. A cam roller 5 is seated on the shaft 35 on the outside of the wall 23.

Bei dieser Ausführungsform ist gleichfalls an der Innenseite der Wand 23 ein Antriebsmotor 8 befestigt, dessen Antriebswelle 29 durch die Wand 23 nach außen geführt ist. Auf der Antriebswelle 29 sitzen zwei Zahnriemenscheiben 30,31 mit unterschiedlichen Durchmessern auf, von denen die größere Zahnriemenscheibe 30 über einen Zahnriemen 32 eine Zahnriemenscheibe 12 antreibt, die auf einer gemeinsamen Welle mit einem Zahnradantrieb 34 aufsitzt. Der Zahnradantrieb 34 besteht aus zwei Zahnrädern, die durch eine in sich geschlossene endlose Zahnradkette miteinander verbunden sind. Der Zahnradantrieb versetzt die am Ausgang der Blattzufuhrvorrichtung 1 angeordnete Welle mit den Transportrollen 9 in Bewegung. Die kleinere Zahnriemenscheibe 31 auf der Antriebswelle 29 treibt über einen Zahnriemen 33 eine Zahnriemenscheibe 40 an, die mit dem Nocken 5 fest verbunden auf der Welle 35 aufsitzt. Durch die Umdrehung des Nockens 5 wird die Ansaugkammer 3 in der schon voranstehend beschriebenen Weise verfahren.In this embodiment, a drive motor 8 is also attached to the inside of the wall 23, the drive shaft 29 of which is guided through the wall 23 to the outside. On the drive shaft 29 there are two toothed belt pulleys 30, 31 with different diameters, of which the larger toothed belt pulley 30 drives a toothed belt pulley 12 via a toothed belt 32, which is seated on a common shaft with a gear drive 34. The gear drive 34 consists of two gear wheels, which are connected to one another by a self-contained endless gear chain. The gear drive sets the shaft arranged at the output of the sheet feed device 1 in motion with the transport rollers 9. The smaller toothed belt pulley 31 on the drive shaft 29 drives a toothed belt pulley 40 via a toothed belt 33, which is fixedly connected to the cam 5 on the shaft 35. Due to the rotation of the cam 5, the suction chamber 3 is moved in the manner already described above.

Anhand der schematischen Zeichnungen in den Fig. 5a bis c wird die Wirkungsweise der Blattzufuhrvorrichtung 1 näher beschrieben.The mode of operation of the sheet feeder 1 is described in more detail with reference to the schematic drawings in FIGS. 5a to c.

In der Ansaugphase 1 nach Fig. 5a ist ein erstes Blatt 13 von den Stapel 16 von dem Transportrollen 9 und den Transportwalzen 10 erfaßt und an die Einzugsrollen eines nachgeschalteten, nicht dargestellten Gerätes weiterbefördert worden. Das erste Blatt deckt die Lochplatte der Ansaugkammer 3 zum Teil noch ab. Ein zweites Blatt des Stapels 16 ist von dem nicht abgedeckten Teil der Lochplatte der Ansaugkammer angesaugt und zeigt einen gekrümmten Verlauf. Die Ansaugkammer 3 befindet sich noch in ihrer Ausgangsstellung. Die Ansaugkraft des Lüfters 4 auf das zweite Blatt beträgt etwa 70% der vollen Ansaugkraft und erhöht sich kontinuierlich mit dem fortschreitenden Einzug des ersten Blattes in das nachgeschaltete Gerät. Entsprechend dem Blattgewicht, das in einem Bereich zwischen 30 bis 150 g/m2 liegen kann, wird das zweite Blatt mehr oder weniger stark gekrümmt. Durch die kontinuierlich anwachsende Saugleistung des Lüfters auf das zweite Blatt und durch das Gewicht eines etwa nachfolgenden dritten Blattes wird zwischen diesen Beiden Blättern ein Trenneffekt erzielt, der einen Doppel- oder Mehrfacheinzug von Blättern mit Sicherheit verhindert.In the suction phase 1 according to FIG. 5a, a first sheet 13 has been gripped by the stacks 16 by the transport rollers 9 and the transport rollers 10 and has been conveyed to the feed rollers of a downstream device, not shown. The first sheet still partially covers the perforated plate of the suction chamber 3. A second sheet of the stack 16 is sucked in by the uncovered part of the perforated plate of the suction chamber and shows a curved course. The suction chamber 3 is still in its initial position. The suction force of the fan 4 on the second sheet is approximately 70% of the full suction force and increases continuously as the first sheet progresses into the downstream device. Depending on the sheet weight, which can be in a range between 30 to 150 g / m 2 , the second sheet is more or less curved. Due to the continuously increasing suction power of the fan on the second sheet and the weight of an approximately subsequent third sheet, a separation effect is achieved between these two sheets, which prevents double or multiple feeding of sheets with certainty.

In der Ansaugphase 2 nach Fig. 5b deckt das Blatt 13 die Lochplatte der Ansaugkammer 3 zur Gänze ab und der Nocken 5 beginnt sich zu drehen und die Gleitrolle in Transportrichtung A zu verschieben, wodurch die Ansaugkammer 3 bewegt wird.In the suction phase 2 according to FIG. 5b, the sheet 13 completely covers the perforated plate of the suction chamber 3 and the cam 5 begins to rotate and to shift the slide roller in the transport direction A, as a result of which the suction chamber 3 is moved.

In der Transportphase nach Fig. 5c des Blattes 13 ist die Ansaugkammer 3 um die volle Nockenlänge in Transportrichtung A verfahren worden und die Transportrollen 9 und die Transportwalzen 10 haben die Vorderkante des Blattes 13 erfaßt. Die Fortsetzung der Drehung des Nockens 5 in Pfeilrichtung in Fig. 5c bewirkt, daß die Feder 7 die Ansaugkammer 3 wieder in ihre Ausgangsstellung zurückholen kann.In the transport phase according to FIG. 5c of the sheet 13, the suction chamber 3 has been moved by the full cam length in the transport direction A and the transport rollers 9 and the transport rollers 10 have grasped the front edge of the sheet 13. Continuation of the rotation of the cam 5 in the direction of the arrow in FIG. 5c means that the spring 7 can bring the suction chamber 3 back into its starting position.

Die Lochplatte gewährleistet eine weitgehend breitflächige Ansaugung mit annähernd laminarer Strömung, wobei durch die Abdeckung der Randzonen unerwünschte Luftwirbel verhindert werden, die zu einem Doppel- oder Mehrfacheinzug von Blättern führen können.The perforated plate ensures a largely wide-area suction with approximately laminar flow, whereby the covering of the edge zones prevents unwanted air vortices that can lead to double or multiple feeding of sheets.

Claims (9)

1. Sheet feeding device for the automatic feeding of individual sheets with a displaceable perforated plate from a stack to an apparatus, comprising lower carrier rollers and upper feed rollers in resilient contact with the carrier rollers, characterized in that a suction chamber (3) is provided which may be displaced in the direction (A) in which the individual sheets (13) of a stack (16) are transported and which comprises a cover plate (22) and the perforated plate (2) as base plate, that guide protections (20) for the sheet (13) to be transported are arranged at the front end of the suction chamber (3) over the entire width and that the cover plate (22) is provided with a suction opening (21) for a ventilator (4) positioned on the cover plate (22), above the suction opening.
2. Sheet feeding device according to claim 1, characterized in that in the advanced position of the suction chamber (3), the guide projections (20) rest tangentially against the lower edge of a shaft (38).
3. Sheet feeding device according to claims 1 and 2, characterized in that the guide projections (20) are arranged opposite to a section of the shaft (38) extending between two neighboring feed rollers (9) or, alternatively, a section extending between a wall (23,24) which laterally bounds the suction chamber (3) and the feed roller (9) next to it.
4. Sheet feeding device according to claim 1, characterized in that the suction chamber (3) is laterally bounded by two vertical walls (23.24) between which it may be displaced, and that each of the walls (23,24) comprises a slot (25) extending in the direction of transport (A) in which a sliding roller (26) and a stop roller (28) are guided which laterally project from the side walls of the suction chamber (3) and extend into the slots (25).
5. Sheet feeding device according to claims 1 to 4, characterized in that a mounting rod (19) extending parallel to a supporting table (27) is connected by its ends to the walls (23,24) and that a spring (7) is hinged by one of its ends to the connecting rod (19), and by its other end to a bolt (15) on the ventilator housing (14).
6. Sheet feeding device according to claims 1 to 5, characterized in that a drive motor (8) is attached to the inside of one of the walls and that the driving shaft (29) of the motor passes through the wall (23) to the outside and carries two toothed belt pulleys (30,31) with different diameters, the larger of which pulleys (30) drives a toothed belt pulley (12) by a belt (32), the pulley (12) seating on a common shaft with a gear drive (34) which rotates the shaft (38) carrying the feed rollers (9) arranged at the delivery end of the sheet feeding device (1), and that the smaller of the belt pulleys (31) drives, via a belt (33), a toothed belt pulley (40) which is firmly connected to a cam (5) and seats upon a shaft (35).
7. Sheet feeding device according to claim 6, characterized in that the cam (5) is in contact with a cam roller (6) which seats on the outside of the wall (23), on the same shaft as the sliding roller (26), and that the cam (5) displaces the . suction chamber (3) in transport direction (A), by the cam roller (6), against the tension of the spring (7), by one cam length from its starting position.
8. Sheet feeding device according to claims 1 to 5, characterized in that a motor (8) is attached to the inside of one of the walls (23) and that the driving shaft (29) of the motor passes through the wall (23) to the outside and carries a toothed belt pulley (30) which drives a belt transmission (17) in the form of an endless toothed belt which is guided over a toothed belt pulley (36) seating on the shaft (38) carrying the feed rollers (9) and over a further toothed belt pulley (18) which is firmly attached to the cam
(5).
EP78100292A 1977-07-09 1978-07-03 Sheet feeding device Expired EP0000366B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19772731095 DE2731095A1 (en) 1977-07-09 1977-07-09 SHEET FEED DEVICE
DE2731095 1977-07-09

Publications (2)

Publication Number Publication Date
EP0000366A1 EP0000366A1 (en) 1979-01-24
EP0000366B1 true EP0000366B1 (en) 1980-04-30

Family

ID=6013542

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78100292A Expired EP0000366B1 (en) 1977-07-09 1978-07-03 Sheet feeding device

Country Status (7)

Country Link
US (1) US4280691A (en)
EP (1) EP0000366B1 (en)
JP (1) JPS5418579A (en)
AT (1) AT357030B (en)
CA (1) CA1086342A (en)
DE (2) DE2731095A1 (en)
IT (1) IT1105754B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HUT61622A (en) * 1991-05-08 1993-01-28 Landis & Gyr Betriebs Ag Intermediate card-container
EP0514618B2 (en) * 1991-05-08 2000-05-10 Mars, Incorporated Temporary storage
US5803447A (en) * 1996-09-25 1998-09-08 D&K Custom Machine Design, Inc. Method and apparatus for feeding sheets
US7002714B1 (en) * 2000-11-17 2006-02-21 Stephen Neushul Autofeeder for X-ray scanning
US7559549B2 (en) * 2006-12-21 2009-07-14 Xerox Corporation Media feeder feed rate

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1435205A (en) * 1920-02-16 1922-11-14 Harry L Brigham Pneumatic sheet feeder
US2859964A (en) * 1957-02-19 1958-11-11 Theodore F Aronson Sheet feeding mechanism
GB943359A (en) * 1961-11-11 1963-12-04 Deritend Eng Co Improvements relating to suction feed mechanism for corrugated and like cardboard
NL294543A (en) * 1962-07-09
US3265383A (en) * 1965-04-22 1966-08-09 Eastman Kodak Co Film sheet feeder
US3501138A (en) * 1967-08-30 1970-03-17 Fmc Corp Sheet dispenser
US3610577A (en) * 1969-02-06 1971-10-05 Joseph E Foster Jr Suction feed conveyor
US3614089A (en) * 1969-06-16 1971-10-19 Copystatics Mfg Corp Automatic original feeder for copying machine
US3659838A (en) * 1970-06-12 1972-05-02 J W Hassell Jr Material handling device
US3674367A (en) * 1970-06-15 1972-07-04 Time Inc Method for handling and positioning film

Also Published As

Publication number Publication date
US4280691A (en) 1981-07-28
JPS5418579A (en) 1979-02-10
CA1086342A (en) 1980-09-23
IT1105754B (en) 1985-11-04
DE2731095A1 (en) 1979-01-11
IT7850201A0 (en) 1978-07-07
AT357030B (en) 1980-06-10
EP0000366A1 (en) 1979-01-24
DE2857618D1 (en) 1980-06-12

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