EP0049016B1 - Transport mechanism for webs of paper in accounting machines - Google Patents

Transport mechanism for webs of paper in accounting machines Download PDF

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Publication number
EP0049016B1
EP0049016B1 EP81201039A EP81201039A EP0049016B1 EP 0049016 B1 EP0049016 B1 EP 0049016B1 EP 81201039 A EP81201039 A EP 81201039A EP 81201039 A EP81201039 A EP 81201039A EP 0049016 B1 EP0049016 B1 EP 0049016B1
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EP
European Patent Office
Prior art keywords
tractors
printing platen
transport device
paper web
guiding pieces
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
Application number
EP81201039A
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German (de)
French (fr)
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EP0049016A1 (en
Inventor
Wendelin Weber
Manfred Rosenthal
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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Publication date
Application filed by Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0049016A1 publication Critical patent/EP0049016A1/en
Application granted granted Critical
Publication of EP0049016B1 publication Critical patent/EP0049016B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/26—Pin feeds
    • B41J11/34—Guides coacting with pin feeds

Definitions

  • the invention relates to a transport device for paper webs with two tractors per paper web, which are arranged on two associated bearing shafts and can be driven by at least one bearing shaft and each have an endless transport chain with pins with holding flaps pivotable on their long sides, in which the paper web has one long side of the assigned tractors is fed to the pressure abutment, guided around it and discharged via the other longitudinal side of the assigned tractors, and a guide piece is arranged on the end of the assigned tractors facing the pressure abutment, around which the paper web is guided in a curved manner in front of the pressure abutment.
  • Such a transport device is known from DE-A-20 62 806.
  • the double-sided guidance of the paper web on the tractor ensures good guidance by 180 ° around the pressure abutment designed as a roller. Since the paper web can expand or shrink depending on the air humidity, a deflection member designed as a roller is arranged on the tractor, which ensures that the paper always rests on the printing roller under approximately the same tension.
  • the invention has for its object to provide a transport device of the type mentioned that displacement and bulging of the paper layers of the paper web to each other is largely avoided and that an easy and convenient insertion of the paper web in the tractors is possible.
  • the guide pieces extend continuously from the front of the tractor to the contact area in which the supplied paper web touches the pressure abutment, that the two tractors can be pivoted about the other bearing shaft with one of their two bearing shafts, and that the guide pieces pivot when swiveling the tractors are led over the surface of the pressure abutment into the swivel position.
  • the tractors with the guide pieces can be pivoted about one of their two bearing shafts, the guide pieces then being moved over the pressure abutment when the tractors are pivoted away.
  • the guide pieces on the assigned tractors In order to render manufacturing tolerances ineffective, it is expedient to articulate the guide pieces on the assigned tractors and to support them with their front part on the pressure abutment.
  • the respective guide piece with a sliding element, for. B. a roller, roller or a felt covering on the front part.
  • the paper webs are particularly well inserted into the underside of the tractors when they are pivoted about the rear bearing shaft, which is arranged away from the pressure abutment.
  • the front bearing shaft is supported on the rear. It is also possible to connect the guide pieces to the assigned tractors in an articulated rather than flexible manner. In order to guide the guide pieces over the pressure abutment in this case, the distance between the pressure abutment and the two tractors must be increased by moving one of these parts to such an extent that the tractors can be pivoted freely with their guide pieces.
  • the transport device shown in the figures consists of the side parts 20 and 21, which are fastened to a booking machine frame via straps in a known manner.
  • the two side parts are firmly connected to one another by the bearing rod 16 and the stop rod 19. It is also on these side parts 20 and 21 attached a connecting plate 22, which is not shown in Figure 1.
  • the rear bearing shaft 6 is supported in the side parts 20 and 21. This is driven synchronously with the pressure abutment 4 designed as a roller via the gear 17 by an electric motor (not shown). However, it can also be rotated manually by the handwheel 10.
  • the electric motor is not slotted to insert the paper web, so that the paper is fed by hand.
  • the rear bearing shaft 6 two tractors 2 are arranged so that the endless transport chains stored in the tractors are moved by it. These transport chains have pins 1 and 1a, which engage in the perforation at the edge of the paper web and thereby transport it.
  • the front bearing shaft 15 is also rotatably supported via connecting lever 18. This makes it possible to pivot the tractors around the rear bearing shaft 6, as is indicated in FIG. 1 for a tractor. In the operating position, the tractors 2 rest on the bearing rod 16 while they rest on the stop rod 19 in the pivoted-off state.
  • the pivoted position of the tractors 2 can be seen in FIG. 3.
  • their retaining flaps 3 are pivoted sideways. Since the underside of the tractors 2 is directed towards the operator, inserting the paper web 7 is easy and convenient.
  • the holding flap 3 is moved back and the tractors are pivoted back into their working position. This working position is shown in Fig. 2.
  • the paper web 7 is then inserted into the pressure device 8 with a pressure roller and placed around the pressure roller 4.
  • the pressure device 8 remains pivoted away from the pressure roller 4 during operation.
  • the retaining flaps 3a are pivoted upward, so that the paper web 7 with its perforation holes can be inserted into the pins 1 of the transport chains in a manner known per se. After the holding flaps 3a have been pivoted back, the clamping process of the paper web 7 is ended.
  • the individual webs are stapled together in the area of the perforation holes. Since the paper web 7 wraps around the roller by 180 ° with such a transport guide, the webs close to the roller 4 are guided on a narrower radius of curvature than the outer webs of the paper web 7.
  • the outer paper layer runs with the required tension around the pressure abutment 4, while the inner layers experience a back pressure through the pressure abutment and form a large wave in front of the pressure abutment 4, which grows on longer paper webs and destroys the so-called crimp-lock adhesion.
  • rollers or sliders can also be used.
  • the spring 12 is stretched until the connecting line of its fastening points has swept over the bearing axis 11.
  • the guide piece 9 is then guided and held in its pivoted stable position by the spring force 12. This stable position is chosen so that the free end of the guide piece 9 is no longer hindered by the roller 4.
  • the guide pieces 9 are still in their pivoted-down position or, if they had to be pivoted back into their working position so as not to impede pivoting of the retaining flaps 3, back into the stable position have been pivoted back, the free end of the guide pieces 9 strikes a stop 14 of the connecting plate 22 shortly before the operating position of the tractors is reached.
  • This situation is indicated by dashed lines in FIG. 3.
  • the course of the stop 14 is to be selected so that the front edge of the free end of the guide piece 9 occurs at an acute angle, so that when the tractors 2 are pivoted further, the guide piece 9 slides on the surface of the stop 14 until the spring 12 again exceeds its dead center position Has.
  • the guide piece 9 is held resiliently against the roller 4 by the spring 12. Since no great forces have to be exerted by the spring 12, it can be dimensioned in such a way that the guide piece 9 abuts the roller 4 only slightly.
  • the guide piece 9 has the shape of a bracket and is adapted to the width of the tractors.
  • other shapes are also conceivable.
  • the guide piece 9 has a slightly curved surface over which the paper web 7 slides.
  • the outer paper layer which runs in under tension, exerts constant pressure over the entire sliding surface, so that the inner paper layers have no possibility of forming a large wave.
  • the surface of the guide piece 9 is formed in a straight line, the paper web exerts different tensions on this surface which are greater at the beginning and end of the surface than in the area in between. This can create many small waves in the paper web distributed over the sliding surface, but these cannot destroy the crimp-lock adhesion of the individual paper layers.

Landscapes

  • Handling Of Sheets (AREA)
  • Advancing Webs (AREA)

Description

Die Erfindung betrifft eine Transportvorrichtung für Papierbahnen mit zwei Traktoren je Papierbahn, die auf zwei zugeordneten Lagerwellen angeordnet und von mindestens einer Lagerwelle antreibbar sind und jeweils eine, Stifte aufweisende endlose Transportkette mit an ihren Längsseiten verschwenkbaren Halteklappen besitzen, bei der die Papierbahn über die eine Längsseite der zugeordneten Traktoren dem Druckwiderlager zugeführt, um dieses herumgeführt und über die andere Längsseite der zugeordneten Traktoren abgeführt wird und bei der an der, dem Druckwiderlager zugewandten Stirnseite der zugeordneten Traktoren jeweils ein Führungsstück angeordnet ist, um das die Papierbahn vor dem Druckwiderlager gekrümmt geführt ist.The invention relates to a transport device for paper webs with two tractors per paper web, which are arranged on two associated bearing shafts and can be driven by at least one bearing shaft and each have an endless transport chain with pins with holding flaps pivotable on their long sides, in which the paper web has one long side of the assigned tractors is fed to the pressure abutment, guided around it and discharged via the other longitudinal side of the assigned tractors, and a guide piece is arranged on the end of the assigned tractors facing the pressure abutment, around which the paper web is guided in a curved manner in front of the pressure abutment.

Eine derartige Transportvorrichtung ist aus der DE-A-20 62 806 bekannt. Durch die doppelseitige Führung der Papierbahn am Traktor wird eine gute Führung um 180° um das als Walze ausgebildete Druckwiderlager erreicht. Da die Papierbahn sich je nach Luftfeuchtigkeit dehnen oder schrumpfen kann, ist am Traktor ein als Rolle ausgebildetes Umlenkorgan angeordnet, das dafür sorgt, daß das Papier stets unter etwa gleicher Spannung an der Druckwalze anliegt.Such a transport device is known from DE-A-20 62 806. The double-sided guidance of the paper web on the tractor ensures good guidance by 180 ° around the pressure abutment designed as a roller. Since the paper web can expand or shrink depending on the air humidity, a deflection member designed as a roller is arranged on the tractor, which ensures that the paper always rests on the printing roller under approximately the same tension.

Beim Transport und Einspannen von Papierbahnen, insbesondere in die Druckvorrichtung einer Buchungsmaschine, ergeben sich jedoch Schwierigkeiten dadurch, daß einerseits das Einlegen in die Unterseite der Traktoren schwierig ist und andererseits bei mehrlagigen Papierbahnen die inneren Bahnen vor der Schreibwalze eine immer größer werdende Welle bilden, durch die die sogenannte Crimp-Lock-Haftung zerstört wird. Diese Haftung hält die einzelnen Bahnen in ihren mit einer Lochung versehenen Randbereichen aneinander fest. Ist aber einmal diese Heftung zerstört, so verschieben sich die Bahnen zueinander so stark, daß die Transportlochung zwischen den einzelnen Papierlagen nicht mehr übereinstimmt und die Stifte der Endloskette in sie nicht mehr eintreten können. Eine einwandfreie Führung der Papierbahnen ist dann nicht mehr möglich.When transporting and clamping paper webs, especially in the printing device of a booking machine, difficulties arise, however, in that on the one hand the insertion into the underside of the tractors is difficult and on the other hand in the case of multilayer paper webs the inner webs in front of the platen roller form an increasing wave which destroys the so-called crimp-lock liability. This adhesion holds the individual sheets together in their perforated edge areas. But once this stapling is destroyed, the webs shift so much towards each other that the transport perforation between the individual layers of paper no longer coincides and the pins of the endless chain can no longer enter them. Proper guidance of the paper webs is then no longer possible.

Der Erfindung liegt die Aufgabe zugrunde, eine Transportvorrichtung der eingangs genannten Art so auszubilden, daß ein Verschieben und Ausbeulen der Papierlagen der Papierbahn zueinander weitgehend vermieden wird und daß ein leichtes und bequemes Einlegen der Papierbahn in die Traktoren möglich ist.The invention has for its object to provide a transport device of the type mentioned that displacement and bulging of the paper layers of the paper web to each other is largely avoided and that an easy and convenient insertion of the paper web in the tractors is possible.

Diese Aufgabe wird dadurch gelöst, daß die Führungsstücke von der Traktorstirnseite durchgehend bis an den Berührungsbereich heranreichen, in welchem die zugeführte Papierbahn das Druckwiderlager berührt, daß die beiden Traktoren mit einer ihrer beiden Lagerwellen um die andere Lagerwelle schwenkbar sind, und daß die Führungsstücke beim Abschwenken der Traktoren über die Oberfläche des Druckwiderlagers in die Abschwenkstellung hinübergeführt werden.This object is achieved in that the guide pieces extend continuously from the front of the tractor to the contact area in which the supplied paper web touches the pressure abutment, that the two tractors can be pivoted about the other bearing shaft with one of their two bearing shafts, and that the guide pieces pivot when swiveling the tractors are led over the surface of the pressure abutment into the swivel position.

Eine durchgehend verlaufende Oberfläche der Führungsstücke, die dann in der Tangentialebene des Druckwiderlagers endet, bringt gegenüber den bekannten Anordnungen eine wesentliche Verbesserung in der Papierbahnführung.A continuous surface of the guide pieces, which then ends in the tangential plane of the pressure abutment, brings a significant improvement in the paper web guidance compared to the known arrangements.

Um das Einlegen der Papierbahnen in die Unterseite der jeweils zugeordneten beiden Traktoren zu erleichtern, sind gemäß der Erfindung die Traktoren mit den Führungsstücken um eine ihrer beiden Lagerwellen schwenkbar, wobei dann die Führungsstücke beim Abschwenken der Traktoren über das Druckwiderlager hinübergeführt werden.In order to facilitate the insertion of the paper webs into the underside of the respectively assigned two tractors, according to the invention the tractors with the guide pieces can be pivoted about one of their two bearing shafts, the guide pieces then being moved over the pressure abutment when the tractors are pivoted away.

Um Fertigungstoleranzen unwirksam zu machen, ist es zweckmäßig, die Führungsstücke gelenkig auf den zugeordneten Traktoren zu lagern und sie auf dem Druckwiderlager mit ihrem vorderen Teil abzustützen. Hierzu kann das jeweilige Führungsstück mit einem Gleitelement, z. B. einer Walze, Rolle oder einem Filzbelag am vorderen Teil versehen werden.In order to render manufacturing tolerances ineffective, it is expedient to articulate the guide pieces on the assigned tractors and to support them with their front part on the pressure abutment. For this purpose, the respective guide piece with a sliding element, for. B. a roller, roller or a felt covering on the front part.

Die Zurückführung der Führungsstücke in die Lage, in der sie auf dem Druckwiderlager aufliegen, wird erreicht, indem sie beim Zurückschwenken der Traktoren gegen einen ortsfesten Anschlag anstoßen und dadurch entgegen der zugeordneten Totpunktfeder verschwenkt werden, die dann die Anlagekraft des Führungsstückes auf das Druckwiderlager erzeugt.The return of the guide pieces to the position in which they rest on the pressure abutment is achieved by hitting a fixed stop when the tractors swivel back and are thereby pivoted against the associated dead center spring, which then generates the contact force of the guide piece on the pressure abutment.

Ein besonders gutes Einlegen der Papierbahnen in die Unterseite der Traktoren ergibt sich, wenn diese um die hintere, vom Druckwiderlager entfernt angeordnete Lagerwelle geschwenkt werden. Dabei ist die vordere Lagerwelle auf der hinteren gelagert. Es ist auch möglich, die Führungsstücke nicht gelenkig sondern fest bzw. nachgiebig mit den zugeordneten Traktoren zu verbinden. Um in diesem Falle die Führungsstücke über das Druckwiderlager hinwegzuführen, ist der Abstand zwischen Druckwiderlager und den beiden Traktoren durch Verschieben eines dieser Teile soweit zu vergrößern, daß die Traktoren mit ihren Führungsstücken ungehindert verschwenkt werden können.The paper webs are particularly well inserted into the underside of the tractors when they are pivoted about the rear bearing shaft, which is arranged away from the pressure abutment. The front bearing shaft is supported on the rear. It is also possible to connect the guide pieces to the assigned tractors in an articulated rather than flexible manner. In order to guide the guide pieces over the pressure abutment in this case, the distance between the pressure abutment and the two tractors must be increased by moving one of these parts to such an extent that the tractors can be pivoted freely with their guide pieces.

Die Erfindung wird im folgenden anhand eines Ausführungsbeispieles näher erläutert. Es zeigen :

  • Figur 1 eine perspektivische Ansicht der Transportvorrichtung nach der Erfindung,
  • Figur 2 die Seitenansicht der Vorrichtung im Schnitt und in Betriebsstellung und
  • Figur 3 die Seitenansicht der Vorrichtung im Schnitt bei abgeschwenkten Traktoren.
The invention is explained in more detail below using an exemplary embodiment. Show it :
  • FIG. 1 shows a perspective view of the transport device according to the invention,
  • Figure 2 is a side view of the device in section and in the operating position and
  • Figure 3 is a side view of the device in section with the tractors swung down.

Die in den Figuren dargestellte Transportvorrichtung besteht aus den Seitenteilen 20 und 21, die über Laschen in bekannter Weise an einem Buchungsmaschinengestell befestigt sind. Die beiden Seitenteile werden durch die Lagerstange 16 und die Anschlagstange 19 fest miteinander verbunden. Außerdem ist an diesen Seitenteilen 20 und 21 ein Verbindungsblech 22 befestigt, das in der Figur 1 nicht dargestellt ist. In den Seitenteilen 20 und 21 ist die hintere Lagerwelle 6 gelagert. Diese wird synchron mit dem als Walze ausgebildeten Druckwiderlager 4 über das Getriebe 17 durch einen nicht dargestellten Elektromotor angetrieben. Sie kann jedoch auch manuell durch das Handrad 10 gedreht werden. Zum Einlegen der Papierbahn ist der Elektromotor nicht eingeschlatet, so daß der Papiervorschub von Hand erfolgt.The transport device shown in the figures consists of the side parts 20 and 21, which are fastened to a booking machine frame via straps in a known manner. The two side parts are firmly connected to one another by the bearing rod 16 and the stop rod 19. It is also on these side parts 20 and 21 attached a connecting plate 22, which is not shown in Figure 1. The rear bearing shaft 6 is supported in the side parts 20 and 21. This is driven synchronously with the pressure abutment 4 designed as a roller via the gear 17 by an electric motor (not shown). However, it can also be rotated manually by the handwheel 10. The electric motor is not slotted to insert the paper web, so that the paper is fed by hand.

Auf der hinteren Lagerwelle 6 sind zwei Traktoren 2 so angeordnet, daß von ihr die in den Traktoren gelagerten endlosen Transportketten bewegt werden. Diese Transportketten besitzen Stifte 1 und 1a, die in die Perforation am Rand der Papierbahn eingreifen und dadurch diese transportieren. Auf der hinteren Lagerwelle 6 ist außerdem über Verbindungshebel 18 die vordere Lagerwelle 15 drehbar gelagert. Dadurch ist es möglich, die Traktoren um die hintere Lagerwelle 6 zu schwenken, wie dies in Fig. 1 bei einem Traktor angedeutet ist. In der Betriebsstellung liegen die Traktoren 2 auf der Lagerstange 16 auf während sie im abgeschwenkten Zustand an der Anschlagstange 19 anliegen.On the rear bearing shaft 6 two tractors 2 are arranged so that the endless transport chains stored in the tractors are moved by it. These transport chains have pins 1 and 1a, which engage in the perforation at the edge of the paper web and thereby transport it. On the rear bearing shaft 6, the front bearing shaft 15 is also rotatably supported via connecting lever 18. This makes it possible to pivot the tractors around the rear bearing shaft 6, as is indicated in FIG. 1 for a tractor. In the operating position, the tractors 2 rest on the bearing rod 16 while they rest on the stop rod 19 in the pivoted-off state.

Die abgeschwenkte Lage der Traktoren 2 ist aus Fig. 3 zu entnehmen. Zum Einlegen einer Papierbahn 7 in die Unterseite der Traktoren werden deren Halteklappen 3 seitlich abgeschwenkt. Da hierbei die Unterseite der Traktoren 2 zum Bediener gerichtet ist, ist das Einlegen der Papierbahn 7 leicht und bequem. Nach dem Einlegen der Papierbahn wird die Halteklappe 3 zurückbewegt und die Traktoren wieder in ihre Arbeitsstellung zurückgeschwenkt. Diese Arbeitsstellung ist in Fig. 2 dargestellt. Danach wird die Papierbahn 7 in die Andruckeinrichtung 8 mit Druckrolle eingeführt und um die Druckwalze 4 herumgelegt. Dabei bleibt während des Betriebes die Andruckeinrichtung 8 von der Druckwalze 4 abgeschwenkt. Anschließend werden die Halteklappen 3a hochgeschwenkt, so daß in an sich bekannter Weise die Papierbahn 7 mit ihren Perforationslöchern in die Stifte 1 der Transportketten eingelegt werden kann. Nach Zurückschwenken der Halteklappen 3a ist der Einspannvorgang der Papierbahn 7 beendet.The pivoted position of the tractors 2 can be seen in FIG. 3. To insert a paper web 7 into the underside of the tractors, their retaining flaps 3 are pivoted sideways. Since the underside of the tractors 2 is directed towards the operator, inserting the paper web 7 is easy and convenient. After inserting the paper web, the holding flap 3 is moved back and the tractors are pivoted back into their working position. This working position is shown in Fig. 2. The paper web 7 is then inserted into the pressure device 8 with a pressure roller and placed around the pressure roller 4. The pressure device 8 remains pivoted away from the pressure roller 4 during operation. Subsequently, the retaining flaps 3a are pivoted upward, so that the paper web 7 with its perforation holes can be inserted into the pins 1 of the transport chains in a manner known per se. After the holding flaps 3a have been pivoted back, the clamping process of the paper web 7 is ended.

Bei mehrlagigen Papierbahnen 7 sind die einzelnen Bahnen im Bereich der Perforationslöcher zusammengeheftet. Da die Papierbahn 7 bei einer derartigen Transportführung die Walze um 180° umschlingt, werden die der Walze 4 naheliegenden Bahnen auf einem engeren Krümmungsradius geführt als die äußeren Bahnen der Papierbahn 7. Beim Transport einer mehrlagigen Papierbahn, insbesondere mit mehr als vier Lagen, entsteht nach kurzer Zeit vor dem Druckwiderlager 4 eine unterschiedliche Papierspannung. Die äußere Papierlage läuft mit der erforderlichen Spannung um das Druckwiderlager 4, während die inneren Lagen durch das Druckwiderlager einen Rückstau erfahren und eine große Welle vor dem Druckwiderlager 4 bilden, die bei längeren Papierbahnen anwächst und die sogenannte Crimp-Lock-Haftung zerstört. Die einzelnen Papierlagen verschieben sich daraufhin immer mehr, was schließlich zu Störungen im Transport der Papierbahn 7 führt. Um dies zu verhindern, sind an den Traktoren 2 Führungsstücke 9 angeordnet, die möglichst weit bis in den Bereich geführt sind, in welchem die Papierbahn 7 die Walze 4 berührt. Es ist möglich, die Führungsstücke 9 fest mit den Traktoren 2 zu verbinden. Sollen jedoch die Traktoren 2 um die hintere Lagerwelle 6 geschwenkt werden, so ist dies bei feststehenden Führungsstücken 9 nicht möglich, weil die Walze 4 im Schwenkbereich liegt. Eine Möglichkeit zur Lösung dieses Problems besteht darin, daß entweder die Walze 4 oder die Traktoren 2 von dem anderen Teil in der von ihnen gebildeten Ebene verschoben werden. Das dargestellte Ausführungsbeispiel zeigt eine weitere Möglichkeit, indem die Führungsstücke 9 schwenkbar mit den Traktoren 2 verbunden sind. Die Schwenkachse 11 dient dabei gleichzeitig als Totpunkt für die Totpunktfeder 12.In the case of multilayer paper webs 7, the individual webs are stapled together in the area of the perforation holes. Since the paper web 7 wraps around the roller by 180 ° with such a transport guide, the webs close to the roller 4 are guided on a narrower radius of curvature than the outer webs of the paper web 7. When transporting a multi-layer paper web, in particular with more than four layers, the following occurs a short time before the platen 4 a different paper tension. The outer paper layer runs with the required tension around the pressure abutment 4, while the inner layers experience a back pressure through the pressure abutment and form a large wave in front of the pressure abutment 4, which grows on longer paper webs and destroys the so-called crimp-lock adhesion. The individual layers of paper then shift more and more, which ultimately leads to faults in the transport of the paper web 7. To prevent this, 2 guide pieces 9 are arranged on the tractors, which are guided as far as possible into the area in which the paper web 7 touches the roller 4. It is possible to firmly connect the guide pieces 9 to the tractors 2. However, if the tractors 2 are to be pivoted about the rear bearing shaft 6, this is not possible with fixed guide pieces 9 because the roller 4 lies in the pivoting range. One way to solve this problem is that either the roller 4 or the tractors 2 are moved from the other part in the plane they form. The illustrated embodiment shows a further possibility in that the guide pieces 9 are pivotally connected to the tractors 2. The pivot axis 11 also serves as a dead center for the dead center spring 12.

Werden die Traktoren 2 abgeschwenkt, so gleiten die Führungsstücke 9 über die Oberfläche der Walze 4. Um die Walze 4 dabei nicht zu beschädigen, ist am freien Ende der Führungsstücke 9 eine Walze 13 angeordnet. Anstelle dieser Walze 13 können auch Rollen oder Gleitstücke benutzt werden. Beim Schwenkvorgang der Traktoren wird die Feder 12 gedehnt, bis die Verbindungslinie ihrer Befestigungspunkte die Lagerachse 11 überstrichen hat. Anschließend wird durch die Federkraft 12 das Führungsstück 9 in seine abgeschwenkte stabile Lage geführt und gehalten. Diese stabile Lage ist so gewählt, daß das freie Ende des Führungsstückes 9 durch die Walze 4 nicht mehr behindert wird.If the tractors 2 are swiveled, the guide pieces 9 slide over the surface of the roller 4. In order not to damage the roller 4, a roller 13 is arranged at the free end of the guide pieces 9. Instead of this roller 13, rollers or sliders can also be used. During the swiveling process of the tractors, the spring 12 is stretched until the connecting line of its fastening points has swept over the bearing axis 11. The guide piece 9 is then guided and held in its pivoted stable position by the spring force 12. This stable position is chosen so that the free end of the guide piece 9 is no longer hindered by the roller 4.

Werden nach Einlegen der Papierbahn 7 die Traktoren 2 wieder zurückgeschwenkt, so befinden sich die Führungsstücke 9 noch in ihrer abgeschwenkten Lage oder, wenn sie wieder in ihre Arbeitslage zurückgeschwenkt werden mußten, um ein Abschwenken der Halteklappen 3 nicht zu behindern, wieder in die stabile Lage zurückgeschwenkt wurden, so stößt das freie Ende der Führungsstücke 9 kurz vor Erreichen der Betriebslage der Traktoren auf einen Anschlag 14 des Verbindungsbleches 22. Diese Situation ist in Fig. 3 gestrichelt angedeutet. Der Verlauf des Anschlages 14 ist so zu wählen, daß die vordere Kante des freien Endes des Führungsstückes 9 im spitzen Winkel auftritt, so daß beim Weiterschwenken der Traktoren 2 das Führungsstück 9 auf der Fläche des Anschlages 14 gleitet bis die Feder 12 ihre Totpunktlage wieder überschritten hat. Durch die Feder 12 wird das Führungsstück 9 federnd gegen die Walze 4 gehalten. Da von der Feder 12 keine großen Kräfte ausgeübt werden müssen, kann sie so bemessen sein, daß das Führungsstück 9 nur leicht an der Walze 4 anliegt.If the tractors 2 are pivoted back after inserting the paper web 7, the guide pieces 9 are still in their pivoted-down position or, if they had to be pivoted back into their working position so as not to impede pivoting of the retaining flaps 3, back into the stable position have been pivoted back, the free end of the guide pieces 9 strikes a stop 14 of the connecting plate 22 shortly before the operating position of the tractors is reached. This situation is indicated by dashed lines in FIG. 3. The course of the stop 14 is to be selected so that the front edge of the free end of the guide piece 9 occurs at an acute angle, so that when the tractors 2 are pivoted further, the guide piece 9 slides on the surface of the stop 14 until the spring 12 again exceeds its dead center position Has. The guide piece 9 is held resiliently against the roller 4 by the spring 12. Since no great forces have to be exerted by the spring 12, it can be dimensioned in such a way that the guide piece 9 abuts the roller 4 only slightly.

Im gewählten Beispiel hat das Führungsstück 9 die Gestalt eines Bügels und ist der Breite der Traktoren angepaßt. Es sind aber auch andere Formen denkbar.In the selected example, the guide piece 9 has the shape of a bracket and is adapted to the width of the tractors. However, other shapes are also conceivable.

Besonders vorteilhaft ist es, wenn das Führungsstück 9 eine leicht gekrümmte Oberfläche hat, über die die Papierbahn 7 gleitet. Die äußerer Papierlage, die unter einer Spannung einläuft, übt so über die gesamte Gleitfläche gleichbleibenden Druck aus, wodurch die inneren Papierlagen keine Möglichkeit haben, eine große Welle zu bilden. Wird dagegen die Oberfläche des Führungsstückes 9 geradlinig ausgebildet, so werden von der Papierbahn auf diese Oberfläche unterschiedliche Spannungen ausgeübt, die am Anfang und Ende der Oberfläche größer sind als im Bereich dazwischen. Dadurch können über der Gleitfläche verteilt viele kleine Wellen in der Papierbahn entstehen, die jedoch die Crimp-Lock-Haftung der einzelnen Papierlagen nicht zerstören können.It is particularly advantageous if the guide piece 9 has a slightly curved surface over which the paper web 7 slides. The outer paper layer, which runs in under tension, exerts constant pressure over the entire sliding surface, so that the inner paper layers have no possibility of forming a large wave. If, on the other hand, the surface of the guide piece 9 is formed in a straight line, the paper web exerts different tensions on this surface which are greater at the beginning and end of the surface than in the area in between. This can create many small waves in the paper web distributed over the sliding surface, but these cannot destroy the crimp-lock adhesion of the individual paper layers.

Claims (7)

1. A transport device for paper webs (7) comprising two tractors (2) per paper web (7), which are journalled on two associated bearing shafts (6, 15) and can be driven by at least one bearing shaft (6) and have an endless transport chain with pins (1, 1a) and have retaining flaps (3) pivotable at their longitudinal sides, in which the paper web (7) fed via one longitudinal side on the associated tractors (2) to a printing platen (4), is guided around this printing platen and is discharged via the other longitudinal side of the associated tractors (2), and in which at the end face of each of the associated tractors (2) facing the printing platen (4) there is arranged a guiding piece (9) around which the paper web (7) is guided so as to be curved in front of the printing platen (4), characterized in that the guiding pieces (9) extend continuously from the tractor end face as far as the contact area (23) in which the supplied paper web (7) contacts the printing platen (4), in that the two tractors (2) can be turned with one of their two bearing shafts about the axis of the other bearing shaft (6), and in that the guiding pieces (9), upon turning of the tractors (2), are moved to deflected positions by the surface of the printing platen (4).
2. A transport device as claimed in Claim 1, characterized in that the tractors (2) can be turned about the axis of the bearing shaft (6) which is remote from the printing platen (4), and in that the front bearing shaft (15) is arranged so that it can turn about the rear bearing shaft (6).
3. A transport device as claimed in Claim 1 or 2, characterized in that the guiding pieces (9) are pivotable arranged on the associated tractors (2) and bear resiliently on the printing platen (4) with their front parts.
4. A transport device as claimed in Claims 1 to 3, characterized in that the guiding pieces (9) each have a sliding member (13) with which they bear on the printing platen (4).
5. A transport device as claimed in Claim 4, characterized in that the guiding pieces (9), upon turning of the tractors (2) can each be pivoted into a stable position by the printing platen (4). and in that the guiding pieces (9) are held by an over-centre spring (12) in the position in which they bear on the printing platen (4) and in the stable position.
6. A transport device as claimed in Claims 4 and 5, characterized in that, when the tractors (2) are turned back, the guiding pieces (9) abut against a stationary stop (14) of the transport device and can thus be pivoted back from their stable positions.
7. A transport device as claimed in Claims 1 or 2, characterized in that the guiding piece (9) are firmly connected to the front part of the tractors (2) and in that upon turning of the tractors (2) the latter or the printing platen (4) can be moved so as to enlarge their relative distance in such a manner that the guiding pieces (9) slide over the printing platen (4).
EP81201039A 1980-09-29 1981-09-17 Transport mechanism for webs of paper in accounting machines Expired EP0049016B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803036642 DE3036642A1 (en) 1980-09-29 1980-09-29 TRANSPORT DEVICE FOR PAPER RAILS IN BOOKING MACHINES
DE3036642 1980-09-29

Publications (2)

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EP0049016A1 EP0049016A1 (en) 1982-04-07
EP0049016B1 true EP0049016B1 (en) 1984-08-15

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EP81201039A Expired EP0049016B1 (en) 1980-09-29 1981-09-17 Transport mechanism for webs of paper in accounting machines

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US (1) US4413764A (en)
EP (1) EP0049016B1 (en)
JP (1) JPS5785747A (en)
DE (2) DE3036642A1 (en)

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JPS58218220A (en) * 1982-05-21 1983-12-19 Nec Home Electronics Ltd Tuner circuit
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US4491309A (en) * 1983-04-29 1985-01-01 World Color Press, Inc. Conveyor for directing ribbons away from a printing press operating at walk speed
JPS60132855A (en) * 1983-12-21 1985-07-15 Tokyo Electric Co Ltd Paper feed device
DE3400894A1 (en) * 1984-01-10 1985-07-18 Mannesmann AG, 4000 Düsseldorf FORM CUTTING DEVICE FOR EDGE-HOLE CONTINUOUS FORMS WITH Tear-off perforations
DE3412853A1 (en) * 1984-04-03 1985-10-03 Mannesmann AG, 4000 Düsseldorf PRINTER, IN PARTICULAR MATRIX PRINTER, WITH TRANSPORTER FOR EDGE-HOLE RECORD CARRIER
DE3412852C2 (en) * 1984-04-03 1986-07-17 Mannesmann AG, 4000 Düsseldorf Transport device for printers, in particular for matrix printers
US4815879A (en) * 1984-11-20 1989-03-28 Brother Kogyo Kabushiki Kaisha Combined printer and sheet feeding apparatus
DE3571956D1 (en) * 1984-12-14 1989-09-07 Tokyo Electric Co Ltd Paper feed device for a printer
JPS62121956U (en) * 1986-01-28 1987-08-03
US4804124A (en) * 1986-05-15 1989-02-14 Dataproducts Corp. Semi-automatic loading paper feed tractor
DE3806551C2 (en) * 1987-03-02 1994-08-04 Seikosha Kk Printer with a tractor arrangement
JP2724457B2 (en) * 1987-03-02 1998-03-09 セイコープレシジョン株式会社 Printer paper transport device
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Also Published As

Publication number Publication date
JPS5785747A (en) 1982-05-28
DE3165564D1 (en) 1984-09-20
US4413764A (en) 1983-11-08
DE3036642A1 (en) 1982-05-13
EP0049016A1 (en) 1982-04-07
JPH0154259B2 (en) 1989-11-17

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