EP0399629B1 - Paper feed in a matrix printer - Google Patents

Paper feed in a matrix printer Download PDF

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Publication number
EP0399629B1
EP0399629B1 EP90250120A EP90250120A EP0399629B1 EP 0399629 B1 EP0399629 B1 EP 0399629B1 EP 90250120 A EP90250120 A EP 90250120A EP 90250120 A EP90250120 A EP 90250120A EP 0399629 B1 EP0399629 B1 EP 0399629B1
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EP
European Patent Office
Prior art keywords
friction rollers
group
friction
shaft
webs
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.)
Revoked
Application number
EP90250120A
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German (de)
French (fr)
Other versions
EP0399629A2 (en
EP0399629A3 (en
Inventor
Wolfgang Hauslaib
Günter Gomoll
Ulrich Buschmann
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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Application filed by Mannesmann AG filed Critical Mannesmann AG
Priority to AT90250120T priority Critical patent/ATE94471T1/en
Publication of EP0399629A2 publication Critical patent/EP0399629A2/en
Publication of EP0399629A3 publication Critical patent/EP0399629A3/en
Application granted granted Critical
Publication of EP0399629B1 publication Critical patent/EP0399629B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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    • 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
    • B41J11/48—Apparatus for condensed record, tally strip, or like work using two or more papers, or sets of papers, e.g. devices for switching over from handling of copy material in sheet form to handling of copy material in continuous form and vice versa or point-of-sale printers comprising means for printing on continuous copy material, e.g. journal for tills, and on single sheets, e.g. cheques or receipts
    • 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
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/02—Rollers
    • B41J13/036—Rollers co-operating with a roller platen
    • B41J13/042—Front and rear rollers or sets of front or rear rollers each mounted on a separate carrier

Definitions

  • the invention relates to a device for paper transport in printers, in particular in matrix printers, for the optional feeding of single sheets or continuous webs, with at least one feed channel for single sheets formed from pairs of friction rollers and a freely accessible push tractor for continuous webs, and with a printing station and one of these Subsequent friction drive in the paper transport direction for both single sheets and endless webs.
  • Such a device is used when printing on different types of paper in a printer and the other type of paper must be kept in a waiting position.
  • a similar device has become known from EP 0 166 132.
  • the upstream arrangement of a pair of friction rollers in the paper transport direction in front of the printing station which works both for single sheets and for continuous webs like the friction roller pair mentioned in the introduction, the latter, however, being arranged behind the printing station in the paper transport direction.
  • the known solution provides a single feed channel for single sheets formed by means of curved guides and a feed channel for endless webs.
  • it is also mandatory to insert single sheets only on the operating side of the printer and endless webs on the back.
  • the known solution also does not allow a tractor of the usual type Flap type to use because there is only space inside the printer for a so-called spiked wheel.
  • the object of the present invention is to perform a functionally complete separation of the otherwise shared feed channels for single sheets and endless webs, with the exception of the pair of friction rollers downstream of the printing station in the paper transport direction, in order to create clear conditions in terms of friction technology.
  • a deflection roller arranged in the paper transport direction in front of the printing station and extending in length over the width of the paper has a swiveling first group of friction rollers for a first feed channel and a second group of friction rollers offset on the circumference, which can be raised and lowered are assigned, and that when the first group of friction rollers is pivoted down and when the second group of friction rollers is lowered, a feed channel for endless webs is formed together with the deflecting roller, which can be advanced by means of the push tractor and can be conveyed out by means of the friction drive downstream of the printing station.
  • This solution means a functional separation of the feed channels for single sheets and continuous webs insofar as single sheets can be pushed from at least one direction (e.g. from the underside of the printer) or from the top side between a deflecting roller and a group of friction rollers in each case, and endless webs with pivoted and lowered groups of friction rollers, which are spaced apart from the deflection roller, are pushed into the printing station solely by the push tractor.
  • the clear separation of the feed channel functions for single sheets and continuous webs, ie the Assignment of separate functional elements for the formation of respective feed channels for single sheets or for continuous webs serves the improved, trouble-free paper insertion with a paper type waiting.
  • both a feed channel from below and another from above can be formed.
  • the position of the feed channels can advantageously be determined constructively by the fact that the deflecting roller has a larger diameter than the friction rollers of the first group and the second group.
  • the pivoting of the first group of friction rollers can now be effected in that the first group of friction rollers is provided by means of hubs and support springs attached to them, and that the ends of the support springs rest in the area of the printer base plate against the cam projections of a first switching axis.
  • the lowering of the second group of friction rollers can be achieved in that the second group of friction rollers is supported on at least one leaf spring by means of a shaft or a plurality of shaft sections, the first leaf spring ends on a fixed support bearing and the second leaf spring ends on Cam cams of a second switching axis rest.
  • Switching from one mode of operation to the other can be effected in that in the area of the first and second groups of friction rollers on a printer base plate each parallel to the friction roller axes running, provided with cam projections switching axles are provided that eccentric pins are arranged in pairs at the ends of the switching axles, which engage in at least one common push rod, that on a tractor shaft driving the tractors, a gear is resiliently axially mounted, which in the engaged state with the Pinion of a drive motor meshes that a coupling axis is provided running perpendicular to the tractor shaft, the shaft shaft of which carries cams bearing against the front face of the tractor gearwheel and that a toothed pinion is attached to the end of the coupling axis and engages in a spur toothing which is provided on the push rod.
  • An actuation option for setting the desired operating mode results from the fact that the coupling axis has a hand rotary knob at its upper, free end.
  • An advantageous alternative embodiment consists of the fact that a deflection roller arranged in the paper transport direction in front of the printing station and extending in length across the width of the paper has a pressure-changing first group of friction rollers for a first feed channel and a second group of friction rollers offset on the circumference can be raised and lowered, are assigned and that when the first group of friction rollers is pressed on with a reduced pressure force and when the second group of friction rollers is lowered, an intake channel for endless webs is formed together with the deflecting roller, which can be displaced by means of the push tractor and can be conveyed out by means of the friction drive downstream of the pressure station are.
  • the support springs or the support spring ends with a base plate are assigned to the first group of friction rollers, that in each case a spring pin is provided on the base plate and that the spring pin is supported in each case by a compression spring against the printer base plate.
  • the device for paper transport in printers allows the optional feeding of single sheets 1 either from below or from above and the feeding of continuous webs 2 from the rear 3 of the printer.
  • feed channels 4 and 5 are formed for the single sheets 1 and a feed channel 6 for the endless webs 2.
  • the feed channels 4 and 5 consist of a deflection roller 7, which extends over the full width of the paper, and each of groups of friction rollers.
  • the feed channel 4 for single sheets 1 is formed from the deflecting roller 7 and a first group of friction rollers 8 and the feed channel 5 for single sheets 1 from the said deflecting roller 7 and a second group of friction rollers 9.
  • a feed shaft 11 formed from guide ribs 10 is also connected upstream of the feed channel 5. After lowering the second group of friction rollers 9, the functionally independent feed channel 6 for endless webs 2 is created, which are inserted into the feed channel 6 from a push tractor 12 which is freely accessible from above.
  • a printing station 14 which consists of a matrix needle print head 15 and a platen 16. Both single sheets 1 and endless webs 2 are transported out in the paper transport direction 13 by a friction drive 17 arranged downstream of the printing station 14, which can consist of a pair of friction rollers or a driven friction roller with associated pressure arms 17a.
  • the deflection roller 7 has a larger diameter than the friction rollers of the first group 8 and the second group 9 due to the formation of the feed channel. Design details can be changed by the choice of the diameter of the deflection roller 7.
  • the first group of friction rollers 8 can be swiveled out and the second group of friction rollers 9 can be lowered.
  • the friction roller axes 8a and 9a and the axis of the deflection roller 7 run parallel to one another on a printer base plate 18 (with side walls, not shown).
  • the switch axes 21 and 22 are rotatably mounted several times in the printer base plate 18.
  • Support springs 24 are attached to the hubs 23 of the friction roller axles 8a at intervals.
  • a cam projection 19 bears against each support spring end 24a.
  • the second group of friction rollers 9 is supported with a plurality of coaxial partial axes 25 on leaf springs 26 arranged at intervals, the first leaf spring ends 26a resting on a fixed support bearing 27 and the second leaf spring ends 26b resting on the cam cams 20 of the switching axis 22.
  • the shift axles 21 and 22 (FIGS. 4 to 7) each have a pair of eccentric pins 29 and 30 on a shift axle end 28. These engage in a push rod 31.
  • the push rod 31 is movably held in a guide of the printer base plate 18.
  • the eccentric pin 29 forms a link bearing together with the push rod 31, the switching axis end 28 being pivotable about a central axis 32 of the eccentric pin 29.
  • the other eccentric pin 30 moves in a free groove 33.
  • the second group of friction rollers 9 is also raised with the friction roller axis 9a and the employment of the second group of friction rollers 9 is carried out on the deflection roller 7, i.e. feed channels 4 and 5 are formed for the "single sheet feed" mode.
  • the push tractor 12 is driven by a tractor shaft 34 and an electric motor, not shown.
  • the electric motor carries a pinion 35.
  • a gear 36 is resilient on the tractor shaft 34 axially displaceably mounted, which meshes with the pinion 35 in the engaged state (FIGS. 6 and 7), so that the tractor shaft 34 is driven, ie the operating mode "endless web feed” is set.
  • a coupling axis 37 is mounted perpendicular to the tractor shaft 34, and cams 38 are attached to the shaft shaft 37a thereof against the tractor gear wheel end face 36a.
  • a spring 39 presses the gear wheel 36 in the direction against the shaft shaft 37a until it rests on a locking washer 47.
  • a toothed pinion 41 is fastened to the coupling axis end 40 and engages in a spur toothing 42 which forms part of the push rod 31.
  • the coupling axis 37 carries a hand rotary knob 43 at its upper, free end 37b. The respective operating modes can thus be set via the hand rotary knob 43, the coupling axis 37 being rotated from the position shown in FIGS. 4 and 5 to the positions in FIG 6 and 7, in which the cams 38 are ineffective, can engage the gear wheel 36 so that the drive of the pinion 35 is transmitted to the tractor shaft 34, ie the operating mode "continuous web feed" is set.
  • FIGS. 4 and 5 The position with the gear 36 disengaged (FIGS. 4 and 5) thus corresponds to the "single sheet feed” mode.
  • An automated embodiment (FIGS. 4 to 7) shows that the pinion 41 attached to the coupling axis end 40 engages in an output gear 44 of a gear unit 45 with a gear motor 46.
  • This geared motor can therefore be controlled accordingly via electrical signals in order to set either the "single sheet feed” or "endless web feed” operating mode.
  • an alternative invention consists of an interim solution.
  • This intermediate solution is designed according to FIG. 8. It is provided here that the deflecting roller 7, which is arranged in the paper transport direction 13 in front of the printing station 14 and extends in length across the paper width, has a pressure-changing first group of friction rollers 8 for a first feed channel 4 and a second group of friction rollers 9 offset on the circumference. which can be raised and lowered are assigned. When the first group of friction rollers 8 is pressed on with a reduced pressing force and when the second group of friction rollers 9 is lowered, a feed channel 6 for endless webs 2 is formed together with the deflecting roller 7.
  • the endless webs 2 can be displaced by means of the push tractor 12 and can be conveyed out by means of the friction drive 17 arranged downstream of the printing station 14.
  • the first group of friction rollers 8 are assigned the support springs 24 or the support spring ends 24a with a base plate 24b.
  • the support springs 24, the base plate 24b, the friction roller axles 8a and the support spring end 24 are all made from one piece of plasticizable plastic.
  • a spring pin 48 is provided on the base plate 24b - also in one piece.
  • the compression spring 49 is tuned in such a way that either a stronger or a weaker contact force acts on the first group of friction rollers 8.

Description

Die Erfindung betrifft eine Einrichtung für den Papiertransport in Druckern, insbesondere in Matrixdruckern, für das wahlweise Einziehen von Einzelblättern oder von Endlosbahnen, mit zumindest einem aus gleichachsigen Friktionsrollenpaaren gebildeten Einzugskanal für Einzelblätter und einem frei zugänglich angeordneten Schubtraktor für Endlosbahnen sowie mit einer Druckstation und einem dieser in Papiertransportrichtung nachgeordneten Friktionsantrieb sowohl für Einzelblätter als auch für Endlosbahnen.The invention relates to a device for paper transport in printers, in particular in matrix printers, for the optional feeding of single sheets or continuous webs, with at least one feed channel for single sheets formed from pairs of friction rollers and a freely accessible push tractor for continuous webs, and with a printing station and one of these Subsequent friction drive in the paper transport direction for both single sheets and endless webs.

Eine derartige Einrichtung wird dann eingesetzt, wenn in einem Drucker auf unterschiedliche Papiersorten gedruckt werden soll und die jeweils andere Papiersorte in einer Wartestellung gehalten werden muß.Such a device is used when printing on different types of paper in a printer and the other type of paper must be kept in a waiting position.

Eine ähnliche Einrichtung ist durch die EP 0 166 132 bekannt geworden. Unterschiedlich zur gattungsgemäßen Einrichtung ist jedoch die vorgeschaltete Anordnung eines Friktionsrollenpaares in Papiertransportrichtung vor der Druckstation, das sowohl für Einzelblätter als auch für Endlosbahnen wie das einleitend erwähnte Friktionsrollenpaar arbeitet, wobei letzteres jedoch in Papiertransportrichtung hinter der Druckstation angeordnet ist. Die bekannte Lösung sieht insofern einen einzigen mittels Kurvenführungen gebildeten Einzugskanal für Einzelblätter sowie einen Einzugskanal für Endlosbahnen vor. Für die bekannte Lösung ist ferner zwingend vorgeschrieben, Einzelblätter nur an der Bedienungsseite des Druckers und Endlosbahnen an deren Rückseite einzuführen.A similar device has become known from EP 0 166 132. Different from the generic device, however, is the upstream arrangement of a pair of friction rollers in the paper transport direction in front of the printing station, which works both for single sheets and for continuous webs like the friction roller pair mentioned in the introduction, the latter, however, being arranged behind the printing station in the paper transport direction. In this respect, the known solution provides a single feed channel for single sheets formed by means of curved guides and a feed channel for endless webs. For the known solution, it is also mandatory to insert single sheets only on the operating side of the printer and endless webs on the back.

Die bekannte Lösung gestattet ferner nicht, einen Traktor der üblichen Klappenbauart anzuwenden, weil im Inneren des Druckers nur Raum für ein sogenanntes Stachelrad vorhanden ist.The known solution also does not allow a tractor of the usual type Flap type to use because there is only space inside the printer for a so-called spiked wheel.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, bei der eingangs bezeichneten Einrichtung funktionell eine vollständige Trennung der ansonsten gemeinsam genutzten Einzugskanäle für Einzelblätter und Endlosbahnen, ausgenommen des der Druckstation in Papiertransportrichtung nachgeordneten Friktionsrollenpaares, durchzuführen, um reibungstechnisch eindeutige Verhältnisse zu schaffen.The object of the present invention is to perform a functionally complete separation of the otherwise shared feed channels for single sheets and endless webs, with the exception of the pair of friction rollers downstream of the printing station in the paper transport direction, in order to create clear conditions in terms of friction technology.

Die gestellte Aufgabe wird erfindungsgemäß dadurch gelöst, daß einer in Papiertransportrichtung vor der Druckstation angeordneten, sich in ihrer Länge auf Papierbreite erstreckenden Umlenkwalze eine abschwenkbare erste Gruppe von Friktionsrollen für einen ersten Einzugskanal sowie eine am Umfang versetzte zweite Gruppe von Friktionsrollen, die heb- und senkbar sind, zugeordnet ist, und daß bei abgeschwenkter erster Gruppe von Friktionsrollen und bei abgesenkter zweiter Gruppe von Friktionsrollen zusammen mit der Umlenkwalze ein Einzugskanal für Endlosbahnen gebildet ist, die mittels des Schubtraktors vorschiebbar und mittels dem der Druckstation nachgeordneten Friktionsantriebs ausförderbar sind. Diese Lösung bedeutet eine funktionelle Trennung der Einzugskanäle für Einzelblätter und Endlosbahnen insofern, als Einzelblätter von zumindest einer Richtung (z.B. von der Druckerunterseite) oder aber auch von der Oberseite her zwischen eine Umlenkwalze und jeweils einer Gruppe von Friktionsrollen geschoben werden können und Endlosbahnen bei abgeschwenkten und abgesenkten Gruppen von Friktionsrollen, die zur Umlenkwalze in Abstand gebracht werden, allein durch den Schubtraktor in die Druckstation geschoben werden. Die klare Trennung der Einzugskanalfunktionen für Einzelblätter und Endlosbahnen, d.h. die Zuordnung von gesonderten Funktionselementen für die Bildung jeweiliger Einzugskanäle für Einzelblätter oder für Endlosbahnen, dient der verbesserten, störungsfreien Papiereinführung mit Wartestellung einer Papiersorte.The object is achieved according to the invention in that a deflection roller arranged in the paper transport direction in front of the printing station and extending in length over the width of the paper has a swiveling first group of friction rollers for a first feed channel and a second group of friction rollers offset on the circumference, which can be raised and lowered are assigned, and that when the first group of friction rollers is pivoted down and when the second group of friction rollers is lowered, a feed channel for endless webs is formed together with the deflecting roller, which can be advanced by means of the push tractor and can be conveyed out by means of the friction drive downstream of the printing station. This solution means a functional separation of the feed channels for single sheets and continuous webs insofar as single sheets can be pushed from at least one direction (e.g. from the underside of the printer) or from the top side between a deflecting roller and a group of friction rollers in each case, and endless webs with pivoted and lowered groups of friction rollers, which are spaced apart from the deflection roller, are pushed into the printing station solely by the push tractor. The clear separation of the feed channel functions for single sheets and continuous webs, ie the Assignment of separate functional elements for the formation of respective feed channels for single sheets or for continuous webs serves the improved, trouble-free paper insertion with a paper type waiting.

Vorteilhaft ist außerdem, daß bei Anwendung der vorstehend genannten Umlenkwalze für Einzelblätter sowohl ein Einzugskanal von unten als auch ein weiterer von oben gebildet werden kann.It is also advantageous that when using the above-mentioned deflection roller for single sheets, both a feed channel from below and another from above can be formed.

Vorteilhafterweise kann die Lage der Einzugskanäle konstruktiv dadurch bestimmt werden, daß die Umlenkwalze einen größeren Durchmesser aufweist als die Friktionsrollen der ersten Gruppe und der zweiten Gruppe.The position of the feed channels can advantageously be determined constructively by the fact that the deflecting roller has a larger diameter than the friction rollers of the first group and the second group.

Das Abschwenken der ersten Gruppe von Friktionsrollen kann nunmehr dadurch bewirkt werden, daß die erste Gruppe von Friktionsrollen mittels Naben und jeweils an diesen befestigten Stützfedern versehen ist und daß die Stützfeder-Enden im Bereich der Druckergrundplatte gegen die Nockenvorsprünge einer ersten Schaltachse anliegen.The pivoting of the first group of friction rollers can now be effected in that the first group of friction rollers is provided by means of hubs and support springs attached to them, and that the ends of the support springs rest in the area of the printer base plate against the cam projections of a first switching axis.

Demgegenüber kann das Absenken der zweiten Gruppe von Friktionsrollen dadurch erzielt werden, daß die zweite Gruppe von Friktionsrollen mittels einer Welle oder mehreren Wellenabschnitten jeweils zumindest auf einer Blattfeder aufgestützt ist, wobei die ersten Blattfeder-Enden auf einem festen Stützlager und die zweiten Blattfeder-Enden auf Kurvennocken einer zweiten Schaltachse aufliegen.In contrast, the lowering of the second group of friction rollers can be achieved in that the second group of friction rollers is supported on at least one leaf spring by means of a shaft or a plurality of shaft sections, the first leaf spring ends on a fixed support bearing and the second leaf spring ends on Cam cams of a second switching axis rest.

Die Umschaltung von einer auf die andere Betriebsart, d.h. das Abschwenken bzw. Absenken der beiden Gruppen von Friktionsrollen oder die jeweils gegensinnigen Bewegungen können dadurch bewirkt werden, daß im Bereich der ersten und der zweiten Gruppen von Friktionsrollen auf einer Druckergrundplatte zu den Friktionsrollenachsen jeweils parallel verlaufende, mit Nockenvorsprüngen versehene Schaltachsen vorgesehen sind, daß an den Schaltachsen-Enden jeweils paarweise Exzenterzapfen angeordnet sind, die in zumindest eine gemeinsame Schubstange eingreifen, daß auf einer die Traktoren antreibenden Traktorwelle ein Zahnrad federnd axial verschiebbar gelagert ist, das im eingerückten Zustand mit dem Ritzel eines Antriebsmotors kämmt, daß senkrecht zur Traktorwelle verlaufend eine Kupplungsachse vorgesehen ist, deren Wellenschaft gegen die Traktorzahnradstirnseite anliegende Nocken trägt und daß am Kupplungsachsen-Ende ein Zahnritzel befestigt ist, das in eine Geradverzahnung eingreift, die an der Schubstange vorgesehen ist.Switching from one mode of operation to the other, i.e. swiveling or lowering the two groups of friction rollers or the respective opposite movements, can be effected in that in the area of the first and second groups of friction rollers on a printer base plate each parallel to the friction roller axes running, provided with cam projections switching axles are provided that eccentric pins are arranged in pairs at the ends of the switching axles, which engage in at least one common push rod, that on a tractor shaft driving the tractors, a gear is resiliently axially mounted, which in the engaged state with the Pinion of a drive motor meshes that a coupling axis is provided running perpendicular to the tractor shaft, the shaft shaft of which carries cams bearing against the front face of the tractor gearwheel and that a toothed pinion is attached to the end of the coupling axis and engages in a spur toothing which is provided on the push rod.

Eine Betätigungsmöglichkeit für das Einstellen der gewünschten Betriebsart ergibt sich daraus, daß die Kupplungsachse an ihrem oberen, freien Ende einen Handdrehknopf aufweist.An actuation option for setting the desired operating mode results from the fact that the coupling axis has a hand rotary knob at its upper, free end.

Es ist jedoch möglich, die Betriebsarten-Einstellung dadurch zu automatisieren, daß das am Kupplungsachsen-Ende befestigte Zahnritzel in ein Ausgangszahnrad einer Getriebeeinheit mit Getriebemotor eingreift.However, it is possible to automate the operating mode setting in that the pinion attached to the end of the coupling axis engages in an output gear of a gear unit with a gear motor.

Eine vorteilhafte Alternativausführungsform besteht darin, daß daß einer in Papiertransport-Richtung vor der Druckstation angeordneten, sich in ihrer Länge auf Papierbreite erstreckenden Umlenkwalze eine in ihrer Andruckkraft veränderbare erste Gruppe von Friktionsrollen für einen ersten Einzugskanal sowie eine am Umfang versetzte zweite Gruppe von Friktionsrollen, die heb- und senkbar sind, zugeordnet sind und daß bei mit verkleinerter Andruckkraft angedrückter erster Gruppe von Friktionsrollen und bei abgesenkter zweiter Gruppe von Friktionsrollen zusammen mit der Umlenkwalze ein Einzugskanal für Endlosbahnen gebildet ist, die mittels des Schubtraktors verschiebbar und mittels dem der Durckstation nachgeordneten Friktionsantrieb ausförderbar sind.An advantageous alternative embodiment consists of the fact that a deflection roller arranged in the paper transport direction in front of the printing station and extending in length across the width of the paper has a pressure-changing first group of friction rollers for a first feed channel and a second group of friction rollers offset on the circumference can be raised and lowered, are assigned and that when the first group of friction rollers is pressed on with a reduced pressure force and when the second group of friction rollers is lowered, an intake channel for endless webs is formed together with the deflecting roller, which can be displaced by means of the push tractor and can be conveyed out by means of the friction drive downstream of the pressure station are.

Im Ausgestaltung des Alternativgegenstandes wird vorgeschlagen, daß der ersten Gruppe von Friktionsrollen die Stützfedern bzw. die Stützfeder-Enden mit einer Grundplatte zugeordnet sind, daß auf der Grundplatte jeweils ein Federzapfen vorgesehen ist und daß die Federzapfen jeweils durch eine Druckfeder gegen die Druckergrundplatte abgestützt ist.In the embodiment of the alternative object it is proposed that the support springs or the support spring ends with a base plate are assigned to the first group of friction rollers, that in each case a spring pin is provided on the base plate and that the spring pin is supported in each case by a compression spring against the printer base plate.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend näher beschrieben. Es zeigen:

Fig. 1
einen senkrechten Querschnitt durch die Einrichtung für die Betriebsart "Einzelblatteinzug",
Fig. 2
denselben Querschnitt wie Fig. 1 für die Betriebsart "Endlosbahneinzug",
Fig. 3
einen horizontalen Querschnitt als Draufsicht auf die Druckergrundplatte entsprechend dem Schnittverlauf III - III in Fig. 1,
Fig. 4
einen Schnitt quer durch die beiden parallelen Schaltachsen in der Betriebsstellung "Einzelblatteinzug", wie Fig. 1,
Fig. 5
eine zu Fig. 4 gehörende Draufsicht,
Fig. 6
den Schnitt quer durch die beiden Schaltachsen in der Betriebsstellung "Endlosbahneinzug" wie Fig. 2,
Fig. 7
eine zu Fig. 6 gehörende Draufsicht und
Fig. 8
einen senkrechten Querschnitt durch die Einrichtung für eine alternative Ausführungsform.
An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it:
Fig. 1
a vertical cross section through the device for the "single sheet feed" mode,
Fig. 2
the same cross section as FIG. 1 for the operating mode "endless web feed",
Fig. 3
2 shows a horizontal cross section as a top view of the printer base plate in accordance with the section line III-III in FIG. 1,
Fig. 4
2 shows a section across the two parallel switching axes in the "single sheet feed" operating position, as shown in FIG. 1,
Fig. 5
4,
Fig. 6
the section across the two switching axes in the operating position "endless web feed" as Fig. 2,
Fig. 7
a plan view belonging to FIG. 6 and
Fig. 8
a vertical cross section through the device for an alternative embodiment.

Die Einrichtung für den Papiertransport in Druckern gestattet das wahlweise Einziehen von Einzelblättern 1 entweder von unten oder von oben und das Einziehen von Endlosbahnen 2 von der Rückseite 3 des Druckers aus.The device for paper transport in printers allows the optional feeding of single sheets 1 either from below or from above and the feeding of continuous webs 2 from the rear 3 of the printer.

Hierzu sind Einzugskanäle 4 und 5 für die Einzelblätter 1 und ein Einzugskanal 6 für die Endlosbahnen 2 gebildet. Die Einzugskanäle 4 und 5 bestehen aus einer Umlenkwalze 7, die sich auf die volle Papierbreite erstreckt, und jeweils aus Gruppen von Friktionsrollen. Der Einzugskanal 4 für Einzelblätter 1 wird aus der Umlenkwalze 7 und einer ersten Gruppe von Friktionsrollen 8 und der Einzugskanal 5 für Einzblätter 1 aus der besagten Umlenkwalze 7 und einer zweiten Gruppe von Friktionsrollen 9 gebildet. Dem Einzugskanal 5 ist außerdem ein aus Führungsrippen 10 gebildeter Einzugsschacht 11 vorgeschaltet. Nach Absenken der zweiten Gruppe von Friktionsrollen 9 entsteht der funktional unabhängige Einzugskanal 6 für Endlosbahnen 2, die aus einem von oben frei zugänglichen Schubtraktor 12 in den Einzugskanal 6 eingeschoben werden.For this purpose, feed channels 4 and 5 are formed for the single sheets 1 and a feed channel 6 for the endless webs 2. The feed channels 4 and 5 consist of a deflection roller 7, which extends over the full width of the paper, and each of groups of friction rollers. The feed channel 4 for single sheets 1 is formed from the deflecting roller 7 and a first group of friction rollers 8 and the feed channel 5 for single sheets 1 from the said deflecting roller 7 and a second group of friction rollers 9. A feed shaft 11 formed from guide ribs 10 is also connected upstream of the feed channel 5. After lowering the second group of friction rollers 9, the functionally independent feed channel 6 for endless webs 2 is created, which are inserted into the feed channel 6 from a push tractor 12 which is freely accessible from above.

Sämtliche bisher beschriebenen, Einrichtungsteile befinden sich in Papiertransportrichtung 13 vor einer Druckstation 14, die aus einem Matrixnadeldruckkopf 15 und einem Druckwiderlager 16 besteht. Sowohl Einzelblätter 1 als auch Endlosbahnen 2 werden in Papiertransportrichtung 13 durch einen der Druckstation 14 nachgeordneten Friktionsantrieb 17 austransportiert, der aus einem Friktionsrollenpaar oder aus einer angetriebenen Friktionsrolle mit zugehörigen Andrückarmen 17a bestehen kann.All of the equipment parts described so far are located in the paper transport direction 13 in front of a printing station 14, which consists of a matrix needle print head 15 and a platen 16. Both single sheets 1 and endless webs 2 are transported out in the paper transport direction 13 by a friction drive 17 arranged downstream of the printing station 14, which can consist of a pair of friction rollers or a driven friction roller with associated pressure arms 17a.

Die Umlenkwalze 7 weist einen durch die Einzugskanalbildung bedingten größeren Durchmesser auf als die Friktionsrollen der ersten Gruppe 8 und der zweiten Gruppe 9. Über die Wahl des Durchmessers der Umlenkwalze 7 können konstruktive Einzelheiten verändert werden.The deflection roller 7 has a larger diameter than the friction rollers of the first group 8 and the second group 9 due to the formation of the feed channel. Design details can be changed by the choice of the diameter of the deflection roller 7.

Nachfolgend wird nunmehr ein Mechanismus beschrieben, um die wahlweise Bildung der Einzugskanäle 4 bzw. 5 oder 6 zu erzielen. Hierzu ist die erste Gruppe von Friktionsrollen 8 abschwenkbar und die zweite Gruppe von Friktionsrollen 9 ist absenkbar.A mechanism is now described below in order to achieve the optional formation of the feed channels 4 or 5 or 6. For this purpose, the first group of friction rollers 8 can be swiveled out and the second group of friction rollers 9 can be lowered.

Auf einer Druckergrundplatte 18 (mit nicht dargestellten Seitenwänden) verlaufen die Friktionsrollenachsen 8a und 9a sowie die Achse der Umlenkwalze 7 zueinander parallel. Entsprechend gleich parallel verlaufen mit Nockenvorsprüngen 19 bzw. 20 versehene Schaltachsen 21 und 22. Die Schaltachsen 21 und 22 sind in der Druckergrundplatte 18 mehrfach drehgelagert.The friction roller axes 8a and 9a and the axis of the deflection roller 7 run parallel to one another on a printer base plate 18 (with side walls, not shown). Switch axes 21 and 22 provided with cam projections 19 and 20, respectively, run correspondingly in parallel. The switch axes 21 and 22 are rotatably mounted several times in the printer base plate 18.

An Naben 23 der Friktionsrollenachsen 8a sind jeweils in Abständen Stützfedern 24 befestigt. An jedem Stützfeder-Ende 24a liegt ein Nockenvorsprung 19 an.Support springs 24 are attached to the hubs 23 of the friction roller axles 8a at intervals. A cam projection 19 bears against each support spring end 24a.

Die zweite Gruppe von Friktionsrollen 9 stützt sich mit mehreren gleichachsigen Teilachsen 25 auf in Abständen angeordnete Blattfedern 26, wobei die ersten Blattfeder-Enden 26a auf einem festen Stützlager 27 und die zweiten Blattfeder-Enden 26b auf den Kurvennocken 20 der Schaltachse 22 aufliegen.The second group of friction rollers 9 is supported with a plurality of coaxial partial axes 25 on leaf springs 26 arranged at intervals, the first leaf spring ends 26a resting on a fixed support bearing 27 and the second leaf spring ends 26b resting on the cam cams 20 of the switching axis 22.

Die Schaltachsen 21 und 22 (Fig. 4 bis 7) tragen an einem Schaltachsen-Ende 28 jeweils paarweise Exzenterzapfen 29 und 30. Diese greifen in eine Schubstange 31 ein. Die Schubstange 31 ist in einer Führung der Druckergrundplatte 18 bewegbar gehalten. Der Exzenterzapfen 29 bildet zusammen mit der Schubstange 31 ein Kulissenlager, wobei um eine Mittelachse 32 des Exzenterzapfens 29 das Schaltachsen-Ende 28 schwenkbar ist. Der andere Exzenterzapfen 30 bewegt sich in einer Freinut 33.The shift axles 21 and 22 (FIGS. 4 to 7) each have a pair of eccentric pins 29 and 30 on a shift axle end 28. These engage in a push rod 31. The push rod 31 is movably held in a guide of the printer base plate 18. The eccentric pin 29 forms a link bearing together with the push rod 31, the switching axis end 28 being pivotable about a central axis 32 of the eccentric pin 29. The other eccentric pin 30 moves in a free groove 33.

Bei Rechtsverschiebung der Schubstange 31 (Fig. 4 und 5) dreht sich die Schaltachse 21 nach rechts um ihre Achse, wodurch alle Nockenvorsprünge 19 (Fig. 1) nach rechts verschwenkt werden, so daß die erste Gruppe von Friktionsrollen 8 auf die Umlenkwalze 7 zugeschwenkt wird, d.h. es besteht die Betriebsart "Einzelblatteinzug" (Fig. 1). Gleichzeitig wird bei Rechtsverschiebung der Schubstange 31 (Fig. 4 und 5) das rechte Schaltachsen-Ende 28 nach rechts verschwenkt, wodurch sich die Nockenvorsprünge 20 ebenfalls rechtsdrehend bewegen und die Blattfedern 26 anheben, d.h. auch die zweite Gruppe von Friktionsrollen 9 wird mit der Friktionsrollenachse 9a angehoben und die Anstellung der zweiten Gruppe von Friktionsrollen 9 wird an die Umlenkwalze 7 vorgenommen, d.h. es werden die Einzugskanäle 4 und 5 für die Betriebsart "Einzelblatteinzug" gebildet.When the push rod 31 is shifted to the right (FIGS. 4 and 5), the switching axis 21 rotates to the right about its axis, as a result of which all the cam projections 19 (FIG. 1) are pivoted to the right, so that the first group of friction rollers 8 is pivoted toward the deflection roller 7 will, ie there is the operating mode "single sheet feed" (Fig. 1). At the same time, when the push rod 31 is shifted to the right (FIGS. 4 and 5), the right switching axis end 28 is pivoted to the right, as a result of which the cam projections 20 likewise move in a clockwise direction and raise the leaf springs 26, i.e. the second group of friction rollers 9 is also raised with the friction roller axis 9a and the employment of the second group of friction rollers 9 is carried out on the deflection roller 7, i.e. feed channels 4 and 5 are formed for the "single sheet feed" mode.

Bei Linksverschiebung der Schubstange 31 (Fig. 6 und 7) erfolgt eine Linksdrehung des Schaltachsen-Endes 28, so daß der Exzenterzapfen 30 in die Nut 33 gelangt. Während dieser Bewegung werden alle Nockenvorsprünge 19 nach links gedreht, so daß die Stützfedern 24 die Friktionsrollenachsen 8a abschwenken, d.h. der Einzugskanal 4 wird aufgehoben. Ebenfalls erfolgt bei Linksverschiebung der (beiden) Schubstange(n) 31 (Fig. 6 und 7) eine Linksdrehung der Nockenvorsprünge 20 (Fig. 2), wodurch die Blattfedern 27 abgesenkt werden, was die Friktionsrollenachsen 9a und damit die zweite Gruppe von Friktionsrollen 9 absenkt, so daß der Einzugskanal 5 aufgehoben und die Betriebsart "Endlosbahn 2" eingestellt wird. Somit besteht der neue Einzugskanal 6.When the push rod 31 is shifted to the left (FIGS. 6 and 7), the switching axis end 28 is turned to the left so that the eccentric pin 30 enters the groove 33. During this movement, all the cam projections 19 are turned to the left so that the support springs 24 pivot the friction roller axes 8a, i.e. the feed channel 4 is canceled. Likewise, when the (two) push rod (s) 31 (FIGS. 6 and 7) are shifted to the left, the cam projections 20 (FIG. 2) are turned to the left, as a result of which the leaf springs 27 are lowered, which results in the friction roller axes 9a and thus the second group of friction rollers 9 lowered so that the feed channel 5 is canceled and the operating mode "endless web 2" is set. The new feed channel 6 is now in place.

Diese wechselweise Umstellung der Betriebsarten "Einzelblatteinzug" und "Endlosbahneinzug" kann entweder von Hand oder automatisch erfolgen. Der Schubtraktor 12 wird durch eine Traktorwelle 34 und einen nicht näher dargestellten Elektromotor angetrieben. Der Elektromotor trägt ein Ritzel 35. Auf der Traktorwelle 34 ist ein Zahnrad 36 federnd axialverschiebbar gelagert, das im eingerückten Zustand (Fig. 6 und 7) mit dem Ritzel 35 kämmt, so daß die Traktorwelle 34 angetrieben wird, d.h. die Betriebsart "Endlosbahneinzug" eingestellt ist.This alternating change of the operating modes "single sheet feed" and "endless web feed" can be done either manually or automatically. The push tractor 12 is driven by a tractor shaft 34 and an electric motor, not shown. The electric motor carries a pinion 35. A gear 36 is resilient on the tractor shaft 34 axially displaceably mounted, which meshes with the pinion 35 in the engaged state (FIGS. 6 and 7), so that the tractor shaft 34 is driven, ie the operating mode "endless web feed" is set.

Senkrecht zur Traktorwelle 34 verlaufend ist eine Kupplungsachse 37 gelagert, wobei auf deren Wellenschaft 37a gegen die Traktorzahnradstirnseite 36a anliegende Nocken 38 befestigt sind. Eine Feder 39 drückt das Zahnrad 36 in Richtung gegen den Wellenschaft 37a bis zur Anlage an eine Sicherungsscheibe 47. Am Kupplungsachsen-Ende 40 ist ein Zahnritzel 41 befestigt, das in eine Geradverzahnung 42 eingreift, die einen Teil der Schubstange 31 bildet. Die Kupplungsachse 37 trägt an ihrem oberen, freien Ende 37b einen Handdrehknopf 43. Die Einstellung der jeweiligen Betriebsarten kann somit über den Handdrehknopf 43 erfolgen, wobei eine Drehung der Kupplungsachse 37 aus der in den Fig. 4 und 5 dargestellten Position in die Positionen der Fig. 6 und 7, in der die Nocken 38 unwirksam sind, das Zahnrad 36 einkuppeln läßt, so daß der Antrieb des Ritzels 35 auf die Traktorwelle 34 übertragen wird, d.h. die Betriebsart "Endlosbahneinzug" eingestellt ist.A coupling axis 37 is mounted perpendicular to the tractor shaft 34, and cams 38 are attached to the shaft shaft 37a thereof against the tractor gear wheel end face 36a. A spring 39 presses the gear wheel 36 in the direction against the shaft shaft 37a until it rests on a locking washer 47. A toothed pinion 41 is fastened to the coupling axis end 40 and engages in a spur toothing 42 which forms part of the push rod 31. The coupling axis 37 carries a hand rotary knob 43 at its upper, free end 37b. The respective operating modes can thus be set via the hand rotary knob 43, the coupling axis 37 being rotated from the position shown in FIGS. 4 and 5 to the positions in FIG 6 and 7, in which the cams 38 are ineffective, can engage the gear wheel 36 so that the drive of the pinion 35 is transmitted to the tractor shaft 34, ie the operating mode "continuous web feed" is set.

Die Stellung bei ausgekuppeltem Zahnrad 36 (Fig. 4 und 5) entspricht somit der Betriebsart "Einzelblatteinzug".
Eine automatisierte Ausführungsform (Fig. 4 bis 7) zeigt, daß das am Kupplungsachsen-Ende 40 befestigte Zahnritzel 41 in ein Ausgangszahnrad 44 einer Getriebeeinheit 45 mit Getriebemotor 46 eingreift. Dieser Getriebemotor kann daher über elektrische Signale entsprechend angesteuert werden, um entweder die Betriebsart "Einzelblatteinzug" oder "Endlosbahneinzug" einzustellen.The position with the gear 36 disengaged (FIGS. 4 and 5) thus corresponds to the "single sheet feed" mode.
An automated embodiment (FIGS. 4 to 7) shows that the pinion 41 attached to the coupling axis end 40 engages in an output gear 44 of a gear unit 45 with a gear motor 46. This geared motor can therefore be controlled accordingly via electrical signals in order to set either the "single sheet feed" or "endless web feed" operating mode.

Währenddem die vorstehend beschriebene Lösung bei angehobener erster Gruppe von Friktionsrollen 8 für den ersten Einzugskanal 4 und bei angehobener zweiter Gruppe von Friktionsrollen 9 eine festbestimmte Andrückkraft auf das jeweilige Papier ausübt, wird diese Anpreßkraft sofort durch Absenken der jeweiligen Gruppe von Friktionsrollen auf den Wert Null gesetzt, d.h. es findet keine Anpressung des Papiers zwischen den Friktionsrollen 7 und 8 bzw. zwischen den Friktionsrollen 7 und 9 statt. Diese Lösung erfolgte daher im Sinn einer vollständigen Trennung der ansonsten gemeinsam genutzten Einzugskanäle 4 und 5 für Einzelblätter und Endlosbahnen.Meanwhile, the solution described above with the first group of friction rollers 8 raised for the first feed channel 4 and at raised second group of friction rollers 9 exerts a fixed pressing force on the respective paper, this contact pressure is immediately set to zero by lowering the respective group of friction rollers, ie there is no pressing of the paper between the friction rollers 7 and 8 or between the friction rollers 7 and 9 instead. This solution was therefore carried out in the sense of a complete separation of the otherwise shared feed channels 4 and 5 for single sheets and endless webs.

Eine alternative Erfindung besteht demgegenüber aus einer Zwischenlösung. Diese Zwischenlösung ist gemäß Fig. 8 gestaltet. Hierbei ist vorgesehen, daß der in Papiertransportrichtung 13 vor der Druckstation 14 angeordneten, sich in ihrer Länge auf Papierbreite erstreckenden Umlenkwalze 7 eine in ihrer Andruckkraft veränderbare erste Gruppe von Friktionsrollen 8 für einen ersten Einzugskanal 4 sowie eine am Umfang versetzte zweite Gruppe von Friktionsrollen 9, die heb- und senkbar sind, zugeordnet sind. Bei mit verkleinerter Andruckkraft angedrückter, erster Gruppe von Friktionsrollen 8 und bei abgesenkter zweiter Gruppe von Friktionsrollen 9 ist zusammen mit der Umlenkwalze 7 ein Einzugskanal 6 für Endlosbahnen 2 gebildet. Die Endlosbahnen 2 sind mittels des Schubtraktors 12 verschiebbar und sind mittels des der Druckstation 14 nachgeordneten Friktionsantriebs 17 ausförderbar. In Fig. 8 ist weiterhin dargestellt, daß der ersten Gruppe von Friktionsrollen 8 die Stützfedern 24 bzw. die Stützfeder-Enden 24a mit einer Grundplatte 24b zugeordnet sind. Zu beachten ist, daß die Stützfedern 24, die Grundplatte 24b, die Friktionsrollenachsen 8a und das Stützfeder-Ende 24 alle zusammen aus einem Stück aus plastifizierbarem Kunststoff hergestellt sind. Hierbei ist auf der Grundplatte 24b - ebenfalls einstückig - jeweils ein Federzapfen 48 vorgesehen. Auf dem Federzapfen 48 befindet sich jeweils eine Druckfeder 49, die sich gegen die Druckergrundplatte 18 und gegen den Federzapfen 48 abstützt. Die Druckfeder 49 ist derart abgestimmt, daß auf die erste Gruppe von Friktionsrollen 8 entweder eine stärkere oder eine schwächere Anstellkraft wirkt.In contrast, an alternative invention consists of an interim solution. This intermediate solution is designed according to FIG. 8. It is provided here that the deflecting roller 7, which is arranged in the paper transport direction 13 in front of the printing station 14 and extends in length across the paper width, has a pressure-changing first group of friction rollers 8 for a first feed channel 4 and a second group of friction rollers 9 offset on the circumference. which can be raised and lowered are assigned. When the first group of friction rollers 8 is pressed on with a reduced pressing force and when the second group of friction rollers 9 is lowered, a feed channel 6 for endless webs 2 is formed together with the deflecting roller 7. The endless webs 2 can be displaced by means of the push tractor 12 and can be conveyed out by means of the friction drive 17 arranged downstream of the printing station 14. 8 also shows that the first group of friction rollers 8 are assigned the support springs 24 or the support spring ends 24a with a base plate 24b. It should be noted that the support springs 24, the base plate 24b, the friction roller axles 8a and the support spring end 24 are all made from one piece of plasticizable plastic. Here, a spring pin 48 is provided on the base plate 24b - also in one piece. On the spring pin 48 there is a compression spring 49, which is against the printer base plate 18 and against the spring pin 48 supports. The compression spring 49 is tuned in such a way that either a stronger or a weaker contact force acts on the first group of friction rollers 8.

Claims (9)

  1. An apparatus for feeding paper in printers, in particular in matrix printers, for selectively drawing in single sheets or endless webs, having at least one intake channel for single sheets which is formed by coaxial pairs of friction rollers and one freely accessibly arranged push tractor for endless webs, and also having a printing station and a friction drive for both single sheets and for endless webs which succeeds the latter in the direction of paper transport, characterised in that a downwardly-pivotable first group of friction rollers (8) for a first intake channel (4) and a second group of friction rollers (9) which is offset on the periphery and which can be raised and lowered are associated with a deflecting roller (7) which is located in the direction of paper transport (13) before the print station (14) and which extends in its length over the width of the paper, and that when the first group of friction rollers (8) is pivoted downwards and when the second group of friction rollers (9) is lowered, together with the deflecting roller (7) an intake channel (6) for endless webs (2) is formed, which webs can be fed by means of the push tractor (12) and can be extracted by means of the friction drive (17) succeeding the print station (12).
  2. An apparatus according to Claim 1, characterised in that the deflecting roller (7) has a larger diameter than the friction rollers of the first group (8) and of the second group (9).
  3. An apparatus according to Claims 1 and 2, characterised in that the first group of friction rollers (8) is provided by means of hubs (23) and supporting springs (24) attached to each of these and that the ends (24a) of the supporting springs in the region of the printer base plate (18) bear against the cam projections (19) of a first switch shaft (21).
  4. An apparatus according to Claims 1 and 2, characterised in that the second group of friction rollers (9) is supported by means of a shaft (25) or a plurality of shaft sections in each case at least on one leaf spring (26), the first ends (26a) of the leaf spring lying against a fixed step bearing (27) and the second ends (26b) of the leaf spring lying on cams (20) of a second switch shaft (22).
  5. An apparatus according to one or more of Claims 1 to 4, characterised in that in the region of the first and second groups of friction rollers (8, 9) switch shafts (21, 22) provided with cam projections (19, 20) are provided on a printer base plate (18) which run parallel to the axes of the friction rollers (8a, 9a) in each case, that eccentric pins (29, 30) are located in each case in pairs on the ends of the switch shafts (28), which pins engage in at least one common connecting rod (31), that a gear wheel (36) is mounted to be resiliently axially displaceable on a tractor shaft (34) which drives the tractors (12), which wheel in the meshed state meshes with the pinion (35) of a drive motor, that a coupling spindle (37) is provided running perpendicular to the tractor shaft (34), the shaft (37a) of which spindle bears cams (38) which bear against the end face (36a) of the tractor gear wheel, and that a pinion (41) is attached to the end (40) of the coupling axis, which pinion engages in spur toothing (42) which is provided on the connecting rod (31).
  6. An apparatus according to one or more of Claims 1 to 5, characterised in that the coupling axis (37) has a manual turning knob (43) on its upper free end (37b).
  7. An apparatus according to one or more of Claims 1 to 6, characterised in that the pinion (41) attached to the end (40) of the coupling axis engages in a starting gear wheel (44) of a gear unit (45) with gear motor (46).
  8. An apparatus for feeding paper in printers, in particular in matrix printers, for selectively drawing in single sheets or endless webs, having at least one intake channel for single sheets which is formed by coaxial pairs of friction rollers and one freely accessibly arranged push tractor for endless webs, and also having a printing station and a friction drive for both single sheets and for endless webs which succeeds the latter in the direction of paper transport, characterised in that a first group of friction rollers (8), the contact pressure of which is changeable, for a first intake channel (4) and also a second group of friction rollers (9) which are offset on the periphery and which can be raised and lowered are associated with a deflecting roller (7) which is located in the direction of paper transport (13) before the print station (14) and which extends in its length over the width of the paper, and that when the first group of friction rollers (8) is pressed on at reduced contact pressure and when the second group of friction rollers (9) is lowered, together with the deflecting roller (7) an intake channel (6) for endless webs (2) is formed, which webs can be displaced by means of the push tractor (12) and can be extracted by means of the friction drive (17) succeeding the print station (14).
  9. An apparatus according to one or more of Claims 2, 3, 5 to 7 and 8, characterised in that the supporting springs (24) or the ends (24a) of the supporting springs with a base plate (24b) are associated with the first group of friction rollers (8), that a spring journal (48) is provided in each case on the base plate (24b), and that the spring journals (48) are supported in each case against the printer base plate (18) by a pressure spring (49).
EP90250120A 1989-05-22 1990-05-10 Paper feed in a matrix printer Revoked EP0399629B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90250120T ATE94471T1 (en) 1989-05-22 1990-05-10 DEVICE FOR PAPER TRANSPORT IN PRINTERS, ESPECIALLY IN MATRIX PRINTERS.

Applications Claiming Priority (4)

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DE3917032 1989-05-22
DE3917032 1989-05-22
DE3939506 1989-11-27
DE3939506A DE3939506A1 (en) 1989-05-22 1989-11-27 DEVICE FOR PAPER TRANSPORT IN PRINTERS, ESPECIALLY IN MATRIX PRINTERS

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EP0399629A2 EP0399629A2 (en) 1990-11-28
EP0399629A3 EP0399629A3 (en) 1991-01-23
EP0399629B1 true EP0399629B1 (en) 1993-09-15

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DE (2) DE3939506A1 (en)

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US5713674A (en) * 1994-10-06 1998-02-03 Pfu Limited Paper feed method and apparatus for a printer
US5772343A (en) * 1997-06-30 1998-06-30 Hewlett Packard Company Media handling system for duplex printing
US5836706A (en) * 1997-12-08 1998-11-17 Hewlett-Packard Company Media handling system for duplex printing
US6286871B1 (en) 1998-05-12 2001-09-11 Carol Wilson Fine Arts, Inc. Pads of embossed, self-stick paper and process and apparatus for making same
US6959849B2 (en) * 2002-12-23 2005-11-01 Polaroid Corporation Drive roller assembly
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DE3270861D1 (en) * 1982-07-29 1986-06-05 Mannesmann Ag Apparatus for feeding record carriers to printers, in particular matrix printers
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JP2782728B2 (en) * 1988-09-06 1998-08-06 セイコーエプソン株式会社 Printer paper feeder
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JPH0636931Y2 (en) * 1988-11-15 1994-09-28 株式会社精工舎 Printer paper feed mechanism

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Publication number Publication date
EP0399629A2 (en) 1990-11-28
DE3939506A1 (en) 1990-11-29
US5158380A (en) 1992-10-27
JPH03101978A (en) 1991-04-26
DE59002706D1 (en) 1993-10-21
EP0399629A3 (en) 1991-01-23
DE3939506C2 (en) 1992-04-30

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