EP0281498B1 - Driving device for sheets and/or webs in an office printer, particularly a matrix printer - Google Patents

Driving device for sheets and/or webs in an office printer, particularly a matrix printer Download PDF

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Publication number
EP0281498B1
EP0281498B1 EP88730011A EP88730011A EP0281498B1 EP 0281498 B1 EP0281498 B1 EP 0281498B1 EP 88730011 A EP88730011 A EP 88730011A EP 88730011 A EP88730011 A EP 88730011A EP 0281498 B1 EP0281498 B1 EP 0281498B1
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EP
European Patent Office
Prior art keywords
roller
supporting force
bearing
frame
feed roll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88730011A
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German (de)
French (fr)
Other versions
EP0281498A3 (en
EP0281498A2 (en
Inventor
Günter Dipl.-Ing.(FH) Gomoll
Wolfgang Dipl.-Ing.(Fh) Hauslaib
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Vodafone GmbH
Original Assignee
Mannesmann AG
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Publication date
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Priority to AT88730011T priority Critical patent/ATE86586T1/en
Publication of EP0281498A2 publication Critical patent/EP0281498A2/en
Publication of EP0281498A3 publication Critical patent/EP0281498A3/en
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Publication of EP0281498B1 publication Critical patent/EP0281498B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/06—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers
    • B65H5/062—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers between rollers or balls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/02—Advancing webs by friction roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H27/00—Special constructions, e.g. surface features, of feed or guide rollers for webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/13—Details of longitudinal profile
    • B65H2404/132—Details of longitudinal profile arrangement of segments along axis
    • B65H2404/1321—Segments juxtaposed along axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/13—Details of longitudinal profile
    • B65H2404/134—Axle
    • B65H2404/1341—Elastic mounting, i.e. subject to biasing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/13—Details of longitudinal profile
    • B65H2404/137—Means for varying longitudinal profiles
    • B65H2404/1371—Means for bending, e.g. for controlled deflection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/14—Roller pairs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/20—Location in space
    • B65H2511/22—Distance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/20—Location in space
    • B65H2511/22—Distance
    • B65H2511/224—Nip between rollers, between belts or between rollers and belts

Definitions

  • the invention relates to a device for the paper transport of single sheets and / or endless webs in office machines, in particular in matrix printers, with friction rollers which are rotatably mounted and at least individually driven in side plates of a frame and which are provided in pairs and which have a length / diameter ratio of 30 : 1 to 50: 1, and, due to their bearing support forces in the frame, have positive or negative bending lines of the first and second pressure rollers, in that a supporting force acts on one of the pressure rollers in the center area, in such a way that the two bending lines run approximately parallel.
  • Another known solution uses a number of pressure rollers which are driven differently to the pressure roller.
  • Another known solution (CH-PS 456 649) provides a printing or impression cylinder for rotogravure printing presses in which the desired uniform pressure distribution cannot easily be achieved by a certain contact pressure. This problem is avoided in that a jacket and the roller core touch only over a predetermined length in the middle of the roller and the rollers and / or the jacket ends have profiles that differ from the central part.
  • the device described in the introduction is known (DE 24 30 929 A1).
  • the known device is unsuitable for paper transport. If a single sheet is to be transported with large clamping forces across its width, it is also crucial that the degree of slenderness of the pressure rollers is defined by the diameter / length ratio. A specific course of bending lines can only be achieved with a predetermined, clearly defined degree of slenderness.
  • a paper web or a paper single sheet is not comparable to a band-shaped workpiece, because nothing is changed on the piece of paper itself.
  • a "workpiece" is a part on which a shaping design is carried out. A sheet of paper does not meet this requirement. Above all, a sheet of paper is not deformed. This would be detrimental to a sheet of paper.
  • the object of the invention is to make the friction the same size over the entire length of long, thin pairs of friction rollers.
  • the pressure roller lying on the inside of the bend line can be generated under prestress due to the supporting force acting on the pressure roller lying on the inside, the pressure roller on the inside being rigid with its roller journals in the frame and the other, opposite 24 679 pressure roller are each rotatably mounted on their roller journals by means of roller levers and on these tension springs suspended in the printer frame, the roller levers being rotatably mounted in the printer frame.
  • This solution is economically cheaper than the known solutions, because it is less expensive on parts that have to be manufactured and kept in stock, and generates uniformly high frictional forces.
  • the supporting force provided in the central area can be generated by means of a bearing roller supported on the printer frame.
  • the supporting force can be transmitted particularly advantageously here due to the rolling friction.
  • the bearing roller generating the supporting force in the central region itself be supported by means of compression springs acting on a roller axis.
  • the magnitude of the force can be set here via the compression springs, whereby there is also coordination with the tension springs attached to the roller levers.
  • a device for paper transport is required which is adapted to the other assemblies of the matrix printer and its dimensions.
  • a matrix printer has friction rollers which are rotatably mounted in side plates and which act as pressure rollers 1 and 2.
  • One or both of the pressure rollers 1 and 2 are driven in rotation.
  • the pressure roller 1 has, for example, a supporting force length of 480 mm and a diameter of 14 mm and the pressure roller 2 has a diameter of 12 mm.
  • Axially immovable, elastic sleeves 3 are also arranged on the pressure roller 2.
  • Single sheets or endless webs 4 are guided in the direction 5 between the pressure rollers 1 and 2 and through a channel 6 in front of a pressure abutment 7, on which the paper is printed lying on the print head 8 and transported out again by the friction rollers 9 and 10.
  • the pressure rollers 1 and 2 considered here are arranged within a paper guide body 22, which forms a further paper channel 12 with the aid of a profile rod 13 (FIG. 1).
  • the bearing support forces 14a and 14b in the printer frame 15 result in a positive bending line 16 of the pressure roller 1 and a negative bending line 17 of the pressure roller 1 by means of a roller lever 18 and a tension spring 19 on the printer frame 15, the pressure roller 1 being pressed resiliently against the pressure roller 2 via the roller levers 18 and the tension springs 19.
  • the pressure rollers 1 and 2 are very thin for a very long time and, for structural reasons, the roller levers 18 can only be attached externally, the pressure rollers 1 and 2 are pressed apart in the central region 20.
  • a supporting force 21 is applied in the central region 20 against the pressure roller 2, so that the negative bending line 17 is converted into a positive bending line 22.
  • the support force 21 can be calculated or determined empirically.
  • the Bending lines 16 and 22 run largely parallel here.
  • An increase in the supporting force 21 results in a preload, the pressure rollers 1 and 2 securely abutting one another over their full length. Accordingly, a fed single sheet or a continuous paper web 4 is pressed and driven over its full width.
  • the roller journals 2a and 2b are rigidly mounted in the printer frame 15, the roller journals 1a and 1b of the pressure roller 1 are fastened to the printer frame 15 via the roller levers 18 and the tension springs 19.
  • the supporting force 21 in the central region 20 is generated by means of bearing roller 24 supported on the printer frame 15 or on a pressure abutment housing 23.
  • the roller axis 24a is supported by compression springs 25a and 25b.
  • the bearing roller 24 and the compression springs 25a and 25b are received in a separate bearing bracket 26.
  • the bearing bracket 26 is fastened in the pressure abutment housing 23 by means of clamping wings 27a and 27b which engage in guide grooves 28.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Unwinding Webs (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Handling Of Cut Paper (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Handling Of Sheets (AREA)

Abstract

In a device for the paper transport of single sheets and/or continuous paper in office machines, in particular in matrix printers, there are provided in pairs and at least separately driven friction rolls (1, 2) which are disposed rotatably in side plates; the friction rolls exhibit a length to diameter ratio of from 30:1 to 50:1 and are therefore very long and very thin. In order to provide the friction force in a uniform manner over the entire length of the very long and thin friction rolls, it is disclosed that the positive running bending line (16) of a first feed roll (1) based on its support forces (14a, 14b) in the printer frame (15) and the negative running bending line (17) of a second friction feed roll (2) based on its support forces (14a, 14b) in the printer frame (15) are tuned to each other such that the two bending lines (16, 22) run approximately parallel.

Description

Die Erfindung betrifft eine Vorrichtung für den Papiertransport von Einzelblättern und/oder Endlosbahnen in Büromaschinen, insbesondere in Matrixdruckern, mit in Seitenplatinen eines Rahmens, drehbar gelagerten und zumindest einzeln angetriebenen Friktionswalzen, die paarweise vorgesehen sind und die ein Längen-/Durchmesser-Verhältnis von 30 : 1 bis 50 : 1 aufweise, und aufgrund ihrer Lagerstützkräfte im Rahmen positiv bzw. negativ verlaufende Biegelinien von ersten und zweiten Andrückwalzen aufweisen, indem an einer der Andrückwalzen im Mittenbereich eine Stützkraft angreift, derart, daß beide Biegelinen annähernd parallel verlaufen.The invention relates to a device for the paper transport of single sheets and / or endless webs in office machines, in particular in matrix printers, with friction rollers which are rotatably mounted and at least individually driven in side plates of a frame and which are provided in pairs and which have a length / diameter ratio of 30 : 1 to 50: 1, and, due to their bearing support forces in the frame, have positive or negative bending lines of the first and second pressure rollers, in that a supporting force acts on one of the pressure rollers in the center area, in such a way that the two bending lines run approximately parallel.

Bei Druckern mit 80 bis 136 Zeichen pro Zeile (d.h. z.B 10 Zeichen pro Zoll) und größeren Zeilenlängen ergeben sich große Abstände der Seitenplatinen, in denen die Friktionswalzen drehgelagert sind. Dementsprechend ergeben sich lange und dünne Friktionswalzen. Die Folge davon ist, daß die Andruckkräfte zur Walzenmitte hin stark abnehmen. Ein eingelegtes Einzelblatt wird durch diese Verhältnisse schief eingezogen.For printers with 80 to 136 characters per line (e.g. 10 characters per Inches) and larger line lengths, there are large distances between the side boards in which the friction rollers are rotatably mounted. Accordingly, there are long and thin friction rollers. The consequence of this is that the pressure forces decrease sharply towards the center of the roll. An inserted single sheet is skewed due to these conditions.

Der Stand der Technik sieht hierzu einzelne, gefederte Rollen vor, die lange dünne Andrückwalzen ersetzen. Derartig gefederte Einzelrollen führen jedoch dann nicht zu einem geraden Einzug des Papiers, wenn diese Rollen von der Bedienungsperson beliebig verstellt werden können und daher meistens asymmetrisch liegen.The prior art provides for individual, spring-loaded rollers that replace long, thin pressure rollers. However, single rolls of this type spring-loaded do not lead to a straight feed of the paper if these rolls can be adjusted as desired by the operator and are therefore usually asymmetrical.

Gemäß einer Veröffentlichung "druck print 2/1983", Seite 86, ist es bekannt, für die Farbübertragung im Tiefdruck einen Biegepresseur gegenüber einer Stützwalze anzuordnen, der mit Druckluft arbeitet. Bei Einspeisung mit Preßluft expandiert die Kammer des Biegepresseurs und belastet eine innere Büchse, welche über zwei Lager gegen den frei um die Mittelachse drehenden Presseurmantel drückt und eine Deformierung desselben bewirkt. Der Verlauf der Mittelachse im belasteten Zustand ist damit gegensinnig zum Verlauf der Achse der Stützwalze. Diese Einrichtung erfordert somit Druckluft und einen Presseurmantel. Diese Drucktechnik gestattet einen gleichmäßigen Spalt oder einen konstanten Anpreßdruck über die gesamte Drucklinie, was jedoch unter einem höheren Aufwand erzwungen wird.According to a publication "druck print 2/1983", page 86, it is known to arrange a bending press opposite a backup roller for gravure ink transfer which works with compressed air. When compressed air is fed in, the chamber of the bending presser expands and loads an inner sleeve which presses against the press sleeve which rotates freely about the central axis via two bearings and causes the same to deform. The course of the central axis in the loaded state is therefore opposite to the course of the axis of the support roller. This device therefore requires compressed air and a press jacket. This printing technique allows a uniform gap or a constant contact pressure over the entire printing line, which is, however, forced at a higher cost.

Eine andere vorbekannte Lösung für Fernschreiber (DE-A-24 06 053) benutzt eine Gummiwalze mit einzeln federnd angeordneten Andrückrollen.Another previously known solution for teletype (DE-A-24 06 053) uses a rubber roller with individually spring-mounted pressure rollers.

Eine weitere bekannte Lösung (DE-PS 253 360) benutzt eine Reihe von Andrückrollen, die zur Druckwalze unterschiedlich angetrieben werden. Eine ebenfalls bekannte Lösung (CH-PS 456 649) sieht für Tiefdruckmaschinen einen Druck- oder Gegendruckzylinder vor, bei dem durch einen bestimmten Anpreßdruck die gewünschte gleichmäßige Druckverteilung nicht ohne weiteres erreicht werden kann. Dieses Problem wird dadurch vermieden, daß sich ein Mantel und der Walzenkern nur auf einer vorbestimmten Länge in der Walzenmitte berühren und die Walzen- und/oder die Mantelenden vom Mittelteil abweichende Profilierungen aufweisen.Another known solution (DE-PS 253 360) uses a number of pressure rollers which are driven differently to the pressure roller. Another known solution (CH-PS 456 649) provides a printing or impression cylinder for rotogravure printing presses in which the desired uniform pressure distribution cannot easily be achieved by a certain contact pressure. This problem is avoided in that a jacket and the roller core touch only over a predetermined length in the middle of the roller and the rollers and / or the jacket ends have profiles that differ from the central part.

Die eingangs bezeichnete Vorrichtung ist bekannt (DE 24 30 929 A1). Die bekannte Vorrichtung ist jedoch für den Papiertransport ungeeignet. Wenn ein Einzelblatt mit über seine Breite gezielt großen Klemmkräften transportiert werden soll, kommt es auch entscheidend auf den durch das Durchmesser-/Längenverhältnis definierten Schlankheitsgrad der Andrückwalzen an. Ein bestimmter Biegelinienverlauf kann nur bei einem vorgegebenen eindeutig definierten Schlankheitsgrad erreicht werden. Insofern ist eine Papierbahn bzw. ein Papier-Einzelblatt nicht mit einem bandförmigen Werkstück vergleichbar, weil an dem Papierstück selbst nichts verändert wird. Ein "Werkstück" ist ein Teil, an dem eine formgebende Gestaltung vorgenommen wird. Diese Bedingung erfüllt ein Blatt Papier nicht. Vor allen Dingen wird ein Blatt Papier nicht verformt. Ein solcher Vorgang wäre für ein Papierblatt schädlich. Es ist außerdem bekannt (GB-A-2 016 424), zum Separieren von einzelnen Blättern sog. Separierrollen anzuordnen, aufgrund deren ein Einzelblatt aus einem Stapel abgezogen werden kann. Hierbei werden federnde Separierrollen gegen Führungsrollen gedrückt, deren Federkraft jedoch erheblich begrenzt sein muß, um entsprechende Reibungskräfte auf das Papier zu übertragen. An die Durchbiegung einer Welle, um gleichmäßige Reibungskräfte über die Wellenlänge zu übertragen, ist nicht gedacht.The device described in the introduction is known (DE 24 30 929 A1). However, the known device is unsuitable for paper transport. If a single sheet is to be transported with large clamping forces across its width, it is also crucial that the degree of slenderness of the pressure rollers is defined by the diameter / length ratio. A specific course of bending lines can only be achieved with a predetermined, clearly defined degree of slenderness. In this respect, a paper web or a paper single sheet is not comparable to a band-shaped workpiece, because nothing is changed on the piece of paper itself. A "workpiece" is a part on which a shaping design is carried out. A sheet of paper does not meet this requirement. Above all, a sheet of paper is not deformed. This would be detrimental to a sheet of paper. It is also known (GB-A-2 016 424) to arrange so-called separating rollers for separating individual sheets, on the basis of which a single sheet can be drawn off from a stack. In this case, resilient separating rollers are pressed against guide rollers, the spring force of which, however, must be considerably limited in order to transmit corresponding frictional forces to the paper. The bending of a shaft in order to transmit uniform frictional forces over the wavelength is not intended.

Der Erfindung liegt die Aufgabe zugrunde, bei langen, dünnen Friktionswalzenpaaren die Friktion über die gesamte Länge gleich groß zu gestalten.The object of the invention is to make the friction the same size over the entire length of long, thin pairs of friction rollers.

Die gestellte Aufgabe wird bei der eingangs bezeichneten Vorrichtung erfindungsgemäß dadurch gelöst, daß die am Biegelinienverlauf innenliegende Andrückwalze unter Vorspannung aufgrund der an innenliegenden Andrückwalze angreitenden Stützkraft erzeugbar ist, wobei die innenliegende Andrückwalze jeweils starr mit ihren Walzenzapfen im Rahmen und die andere, gegenüberliegende 24 679 Andrückwalze jeweils an ihren Walzenzapfen mittels Rollenhebeln und an diesen eingehängten Zugfedern im Druckerrahmen drehgelagert sind, wobei die Rollenhebel drehbar im Druckerrahmen gelagert sind. Diese Lösung ist gegenüber den bekannten Lösungen wirtschaftlich billiger, weil weniger aufwendig an Teilen, die gefertigt und auf Lager gehalten werden müssen, und erzeugt gleichmäßig hohe Friktionskräfte.The stated object is achieved according to the invention in the device described in the introduction in that the pressure roller lying on the inside of the bend line can be generated under prestress due to the supporting force acting on the pressure roller lying on the inside, the pressure roller on the inside being rigid with its roller journals in the frame and the other, opposite 24 679 pressure roller are each rotatably mounted on their roller journals by means of roller levers and on these tension springs suspended in the printer frame, the roller levers being rotatably mounted in the printer frame. This solution is economically cheaper than the known solutions, because it is less expensive on parts that have to be manufactured and kept in stock, and generates uniformly high frictional forces.

Nach weiteren Merkmalen der Erfindung ist vorgesehen, daß die im Mittenbereich vorgesehene Stützkraft mittels einer am Druckerrahmen abgestützten Lagerrolle erzeugbar ist. Die Stützkraft ist hier durch die rollende Reibung besonders vorteilhaft übertragbar.According to further features of the invention, it is provided that the supporting force provided in the central area can be generated by means of a bearing roller supported on the printer frame. The supporting force can be transmitted particularly advantageously here due to the rolling friction.

Weiterhin wird vorgeschlagen, daß die die Stützkraft im Mittenbereich erzeugende Lagerrolle selbst mittels an einer Rollenachse angreifenden Druckfedern abgestützt ist. Die Größe der Kraft kann hier über die Druckfedern eingestellt werden, wobei auch eine Abstimmung mit den an den Rollenhebeln eingehängten Zugfedern stattfindet.It is further proposed that the bearing roller generating the supporting force in the central region itself be supported by means of compression springs acting on a roller axis. The magnitude of the force can be set here via the compression springs, whereby there is also coordination with the tension springs attached to the roller levers.

Schließlich besteht eine Verbesserung der Erfindung darin, daß die die Stützkraft im Mittenbereich erzeugende Lagerrolle zusammen mit den Druckfedern in einem separaten Lagerträger angeordnet ist und daß der Lagerträger in einem Druckwiderlagergehäuse mittels Klemmflügeln befestigt ist, wobei im Druckwiderlagergehäuse Führungsnuten für den Lagerträger vorgesehen sind. Damit wird eine genaue Position der Lagerrolle eingehalten, was zur Parallelität der Beigelinien beiträgt. Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung schematisch dargestellt und wird nachfolgend näher erläutert. Es ziegen:

Fig. 1
einen Querschnitt durch die Papiereinführung und das Druckwiderlager eines Matrixdruckers,
Fig. 2
die Andrückwalzen mit ihrem Biegelinienverlauf von zwei Friktionswalzen ohne die Erfindung (in etwa 100facher Vergrößerung der Biegehöhe),
Fig. 3
die Andrückwalzen mit ihrem Biegelinienverlauf unter Einsatz der Erfindung (in etwa 100facher Vergrößerung der Biegehöhe),
Fig. 4
einen Teilquerschnitt durch den Bereich der Walzenzapfen mit den Rollenhebeln und
Fig. 5
einen horizontalen Teilschnitt durch die Partie mit dem Lagerträger.
Finally, an improvement of the invention is that the bearing roller generating the supporting force in the central region is arranged together with the compression springs in a separate bearing bracket and that the bearing bracket is fastened in a pressure abutment housing by means of clamping vanes, guide grooves for the bearing bracket being provided in the pressure abutment housing. In this way, an exact position of the bearing roll is maintained, which contributes to parallelism of the beige lines. An embodiment of the invention is shown schematically in the drawing and is explained in more detail below. Goats:
Fig. 1
a cross section through the paper inlet and the pressure abutment of a matrix printer,
Fig. 2
the pressure rollers with their bending line course of two friction rollers without the invention (in about 100 times the bending height),
Fig. 3
the pressure rollers with their bending line course using the invention (in about 100 times the bending height),
Fig. 4
a partial cross section through the area of the roll neck with the roller levers and
Fig. 5
a horizontal partial section through the lot with the bearing bracket.

Für eine Büromaschine, wie z.B. Matrixdrucker, wird eine Vorrichtung für den Papiertransport benötigt, die den übrigen Baugruppen des Matrixdruckers und dessen Abmessungen angepaßt ist. Ein Matrixdrucker weist in seinem gewöhnlichen Aufbau in Seitenplatinen drehbar gelagerte Friktionswalzen auf, die als Andrückwalzen 1 und 2 arbeiten. Eine oder beide der Andrückwalzen 1 und 2 ist drehangetrieben. Entsprechend dem Längen-/ Durchmesser-Verhältnis von 30 : 1 bis 50 : 1 besitzt die Andrückwalze 1 z.B. eine Stützkraft-Länge von 480 mm und einen Durchmesser von 14 mm und die Andrückwalze 2 einen Durchmesser von 12 mm. Auf der Andrückwalze 2 sind außerdem axial unverschiebliche, elastische Hülsen 3 angeordnet.For an office machine, such as a matrix printer, a device for paper transport is required which is adapted to the other assemblies of the matrix printer and its dimensions. In its usual design, a matrix printer has friction rollers which are rotatably mounted in side plates and which act as pressure rollers 1 and 2. One or both of the pressure rollers 1 and 2 are driven in rotation. Corresponding to the length / diameter ratio of 30: 1 to 50: 1, the pressure roller 1 has, for example, a supporting force length of 480 mm and a diameter of 14 mm and the pressure roller 2 has a diameter of 12 mm. Axially immovable, elastic sleeves 3 are also arranged on the pressure roller 2.

Einzelblätter oder Endlosbahnen 4 werden in Richtung 5 zwischen die Andrückwalzen 1 und 2 geführt und durch einen Kanal 6 vor ein Druckwiderlager 7, auf dem das Papier satt aufliegend durch den Druckkopf 8 bedruckt und durch die Friktionswalzen 9 und 10 wieder austransportiert werden. Die hier betrachteten Andrückwalzen 1 und 2 sind innerhalb eines Papierleitkörpers 22 angeordnet, der einen weiteren Papierkanal 12 mit Hilfe eines Profilstabes 13 bildet (Fig. 1).Single sheets or endless webs 4 are guided in the direction 5 between the pressure rollers 1 and 2 and through a channel 6 in front of a pressure abutment 7, on which the paper is printed lying on the print head 8 and transported out again by the friction rollers 9 and 10. The pressure rollers 1 and 2 considered here are arranged within a paper guide body 22, which forms a further paper channel 12 with the aid of a profile rod 13 (FIG. 1).

Gemäß Fig. 2, in der die Andrückwalzen 1 und 2 ohne die Erfindung dargestellt sind, ergeben sich aufgrund der Lagerstützkräfte 14a und 14b im Druckerrahmen 15 eine positive Biegelinie 16 der Andrückwalze 1 und eine negative Biegelinie 17 der Andrückwalze 1 mittels jeweils eines Rollenhebels 18 und einer Zugfeder 19 am Druckerrahmen 15, wobei die Andrückwalze 1 über die Rollenhebel 18 und die Zugfedern 19 federnd gegen die Andrückwalze 2 gedrückt wird.2, in which the pressure rollers 1 and 2 are shown without the invention, the bearing support forces 14a and 14b in the printer frame 15 result in a positive bending line 16 of the pressure roller 1 and a negative bending line 17 of the pressure roller 1 by means of a roller lever 18 and a tension spring 19 on the printer frame 15, the pressure roller 1 being pressed resiliently against the pressure roller 2 via the roller levers 18 and the tension springs 19.

Da die Andrückwalzen 1 und 2 sehr lang sehr dünn sind und konstruktiv bedingt die Rollenhebel 18 nur außen angebracht werden können, werden die Andrückwalzen 1 und 2 in dem Mittenbereich 20 auseinandergedrückt.Since the pressure rollers 1 and 2 are very thin for a very long time and, for structural reasons, the roller levers 18 can only be attached externally, the pressure rollers 1 and 2 are pressed apart in the central region 20.

Aufgrund der Erfindung (Fig. 3) wird eine Stützkraft 21 im Mittenbereich 20 gegen die Andrückwalze 2 angesetzt, so daß sich die negativ verlaufende Biegelinie 17 in eine positiv verlaufende Biegelinie 22 umwandelt. Die Stützkraft 21 kann errechnet oder empirisch ermittelt werden. Die Biegelinien 16 und 22 verlaufen hier weitestgehende parallel. Eine Erhöhung der Stützkraft 21 hat eine Vorspannung zur Folge, wobei die Andrückwalzen 1 und 2 sicher auf ihrer vollen Länge aneinanderliegen. Dementsprechend wird ein zugeführtes Einzelblatt oder eine Endlospapierbahn 4 auf ihrer vollen Breite gepreßt und angetrieben. Die Walzenzapfen 2a und 2b sind starr im Druckerrahmen 15 gelagert, die Walzenzapfen 1a und 1b der Andrückwalze 1 über die Rollenhebel 18 und die Zugfedern 19 am Druckerrahmens 15 befestigt sind. Die Stützkraft 21 im Mittenbereich 20 wird mittels am Druckerrahmen 15 bzw. an einem Druckwiderlagergehäuse 23 abgestützten Lagerrolle 24 erzeugt. Deren Rollenachse 24a ist über Druckfedern 25a und 25b gelagert. Die Lagerrolle 24 und die Druckfedern 25a und 25b sind in einem separaten Lagerträger 26 aufgenommen. Der Lagerträger 26 ist in dem Druckwiderlagergehäuse 23 mittels klemmflügeln 27a und 27b, die in Führungsnuten 28 eingreifen, befestigt.On the basis of the invention (FIG. 3), a supporting force 21 is applied in the central region 20 against the pressure roller 2, so that the negative bending line 17 is converted into a positive bending line 22. The support force 21 can be calculated or determined empirically. The Bending lines 16 and 22 run largely parallel here. An increase in the supporting force 21 results in a preload, the pressure rollers 1 and 2 securely abutting one another over their full length. Accordingly, a fed single sheet or a continuous paper web 4 is pressed and driven over its full width. The roller journals 2a and 2b are rigidly mounted in the printer frame 15, the roller journals 1a and 1b of the pressure roller 1 are fastened to the printer frame 15 via the roller levers 18 and the tension springs 19. The supporting force 21 in the central region 20 is generated by means of bearing roller 24 supported on the printer frame 15 or on a pressure abutment housing 23. The roller axis 24a is supported by compression springs 25a and 25b. The bearing roller 24 and the compression springs 25a and 25b are received in a separate bearing bracket 26. The bearing bracket 26 is fastened in the pressure abutment housing 23 by means of clamping wings 27a and 27b which engage in guide grooves 28.

Claims (4)

  1. A device for transporting individual sheets and/or endless webs of paper in office machines, in particular in matrix printers, with friction rollers (1, 2; 9, 10) which are rotationally mounted in side plates of a frame (15) and which are at least individually driven, which rollers are provided in pairs and have a length/diameter ratio of 30 : 1 to 50 : 1 and due to their bearing supporting forces (14a, 14b) in the frame (15) have positively or negatively running elastic lines (22; 17) of first and second feed rolls (1, 2), in that a supporting force (21) acts on one of the feed rolls (1; 2) in the central region (20) such that both elastic lines (17, 22) run approximately parallel,
    characterised in that
    the feed roll (2) lying on the inside of the path of the elastic line can be produced under initial tension due to the supporting force (21) acting on the inner feed roll (2), the inner feed roll (2) being rotationally mounted rigidly with its roller ends (2a, 2b) in the frame in each case and the other opposing feed roll (1) being rotationally mounted in the printer frame (15) in each case on its roller ends (1a, 1b) by means of roller levers (18) and tension springs (19) suspended thereon, the roller levers (18) being rotationally mounted in the printer frame (15).
  2. A device according to Claim 1, characterised in that the supporting force (21) provided in the central region (20) can be generated by means of a bearing roller (24) supported on the printer frame (15).
  3. A device according to Claim 2, characterised in that the bearing roller (24) producing the supporting force (21) in the central region (20) itself is supported by means of pressure springs (25a, 25b) acting on a roller spindle (24a).
  4. A device according to Claims 2 and 3, characterised in that the bearing roller (24) generating the supporting force (21) in the central region (20) together with the pressure springs (25a, 25b) is located in a separate bearing holder (26) and that the bearing holder (26) is fastened in a print counter-surface housing (23) by means of clamping wings (27a, 27b), with guide grooves (28) for the bearing holder (26) being provided in the print counter-surface housing (23).
EP88730011A 1987-02-24 1988-01-15 Driving device for sheets and/or webs in an office printer, particularly a matrix printer Expired - Lifetime EP0281498B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88730011T ATE86586T1 (en) 1987-02-24 1988-01-15 DEVICE FOR PAPER TRANSPORTATION OF SINGLE SHEETS AND/OR CONTINUOUS WEB IN OFFICE MACHINERY, PARTICULARLY IN MATRIX PRINTERS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873705857 DE3705857A1 (en) 1987-02-24 1987-02-24 DEVICE FOR PAPER TRANSPORTATION OF SINGLE SHEETS AND / OR ENDLESS FILMS IN OFFICE MACHINES, ESPECIALLY IN MATRIX PRINTERS
DE3705857 1987-02-24

Publications (3)

Publication Number Publication Date
EP0281498A2 EP0281498A2 (en) 1988-09-07
EP0281498A3 EP0281498A3 (en) 1990-01-10
EP0281498B1 true EP0281498B1 (en) 1993-03-10

Family

ID=6321636

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88730011A Expired - Lifetime EP0281498B1 (en) 1987-02-24 1988-01-15 Driving device for sheets and/or webs in an office printer, particularly a matrix printer

Country Status (5)

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US (1) US4889270A (en)
EP (1) EP0281498B1 (en)
JP (1) JPS63252768A (en)
AT (1) ATE86586T1 (en)
DE (2) DE3705857A1 (en)

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Publication number Priority date Publication date Assignee Title
DE69106605T2 (en) * 1990-07-06 1995-05-18 Sumitomo Rubber Ind Elastic transport roller for paper feed.
JP2001019210A (en) * 1999-07-09 2001-01-23 Alps Electric Co Ltd Paper feeding mechanism for printer
CN102896877A (en) * 2012-09-19 2013-01-30 铜陵其利电子材料有限公司 Flattening roller for coating machine
JP6493129B2 (en) * 2015-09-30 2019-04-03 京セラドキュメントソリューションズ株式会社 Image forming apparatus

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DE253360C (en) *
CH456649A (en) * 1967-05-25 1968-07-31 Winkler Fallert & Co Maschf Printing or impression cylinders for printing machines, in particular gravure printing machines
DE2406053A1 (en) * 1973-03-07 1974-09-26 Geraetewerk Karl Marx Stadt Im PAPER PRINTING DEVICE IN TELE TELEPHONE AND SIMILAR MACHINERY

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NL260454A (en) * 1960-01-28
US3330458A (en) * 1965-05-17 1967-07-11 Quik Chek Electronics And Phot Removable pressure roller mechanism
US3561658A (en) * 1968-09-27 1971-02-09 Fmc Corp Nip roll assembly
DE2063377A1 (en) * 1970-12-23 1972-07-13 Adlerwerke Kleyer Ag H Edge limiting and tabulating device on typewriters and similar machines
AT324944B (en) * 1973-10-12 1975-09-25 Voest Ag DEVICE FOR CONVEYING BELT-SHAPED WORKPIECES IN THE LENGTH DIRECTION OF THE BELT
JPS5760108Y2 (en) * 1978-03-02 1982-12-22
JPS62103169A (en) * 1985-10-30 1987-05-13 Seikosha Co Ltd Paper-feeding mechanism for printer

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Publication number Priority date Publication date Assignee Title
DE253360C (en) *
CH456649A (en) * 1967-05-25 1968-07-31 Winkler Fallert & Co Maschf Printing or impression cylinders for printing machines, in particular gravure printing machines
DE2406053A1 (en) * 1973-03-07 1974-09-26 Geraetewerk Karl Marx Stadt Im PAPER PRINTING DEVICE IN TELE TELEPHONE AND SIMILAR MACHINERY

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
EP0281498A3 (en) 1990-01-10
DE3705857A1 (en) 1988-09-01
JPS63252768A (en) 1988-10-19
US4889270A (en) 1989-12-26
DE3878947D1 (en) 1993-04-15
ATE86586T1 (en) 1993-03-15
EP0281498A2 (en) 1988-09-07

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