EP0235633B1 - Dispositif d'alimentation du papier dans les imprimantes à barres d'appui, en particulier des imprimantes matricielles - Google Patents

Dispositif d'alimentation du papier dans les imprimantes à barres d'appui, en particulier des imprimantes matricielles Download PDF

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Publication number
EP0235633B1
EP0235633B1 EP87101954A EP87101954A EP0235633B1 EP 0235633 B1 EP0235633 B1 EP 0235633B1 EP 87101954 A EP87101954 A EP 87101954A EP 87101954 A EP87101954 A EP 87101954A EP 0235633 B1 EP0235633 B1 EP 0235633B1
Authority
EP
European Patent Office
Prior art keywords
paper
insertion channel
guide profile
friction rollers
pair
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
EP87101954A
Other languages
German (de)
English (en)
Other versions
EP0235633A2 (fr
EP0235633A3 (en
Inventor
Günter Dipl.-Ing.(FH) Gomoll
Wolfgang Dipl.-Ing.(Fh) Hauslaib
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Priority to AT87101954T priority Critical patent/ATE63859T1/de
Publication of EP0235633A2 publication Critical patent/EP0235633A2/fr
Publication of EP0235633A3 publication Critical patent/EP0235633A3/de
Application granted granted Critical
Publication of EP0235633B1 publication Critical patent/EP0235633B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/48—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
    • 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
    • B41J11/0045—Guides for printing material
    • B41J11/005—Guides in the printing zone, e.g. guides for preventing contact of conveyed sheets with printhead
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/26—Pin feeds
    • B41J11/30—Pin traction elements other than wheels, e.g. pins on endless bands
    • 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
    • B41J13/10—Sheet holders, retainers, movable guides, or stationary guides
    • 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
    • B41J13/10—Sheet holders, retainers, movable guides, or stationary guides
    • B41J13/103—Sheet holders, retainers, movable guides, or stationary guides for the sheet feeding section

Definitions

  • the invention relates to a device for paper transport in printers with a bar-shaped print abutment, in particular in matrix printers according to the preamble of claim 1 (CH-A-626 832).
  • the support surface of the paper is advantageous in the case of a print bar / print head system for the formation of extremely clearly legible characters.
  • the friction and adhesion conditions between the pressure abutment and the paper change fundamentally because there is no wrap angle on a pressure beam.
  • new elements have to be created in order to ensure that a recording medium remains in tight contact during and after threading on the pressure bar.
  • a device for paper transport in matrix printers is known (CH-A-626 832) with a bar-shaped print abutment, each with at least one separate insertion channel for successive single sheets (tickets) and an endless paper web.
  • a tractor is provided for the continuous paper web, the tractor and the inlet channel for the endless web being located before the junction in the common inlet channel and thus before the junction of the channel for single sheets.
  • the presence of a single or continuous sheet can be felt there on sensors arranged according to the task to be solved.
  • the drive for a first pair of friction rollers is reversible in the same direction as the drive for the tractor, with the tractor also being optionally disengageable. According to the arrangement of the known friction roller pairs, the transport conditions are directed towards the feeding and smoothing of the paper. However, further functions cannot be performed by the known device.
  • the invention is therefore based on the object, when using a pressure bar, to ensure the feeding and guiding of single sheets, of endless webs, each of different thicknesses, in a trouble-free and largely automated manner.
  • a traction drive is arranged in the paper insertion direction behind the junction and behind a print head.
  • the traction drive advantageously consists of a second pair of friction rollers.
  • a full automation of the paper feed operation is now achieved in that a first paper sensor is arranged in the paper insertion direction in front of the first pair of friction rollers and a second paper sensor behind the junction.
  • the tractor shaft is coupled to the drive.
  • the tractor is uncoupled and the first pair of friction rollers feeds a single sheet.
  • the paper insertion direction can run from bottom to top or vice versa.
  • the invention enables any number of paper insertion directions.
  • the inlet channel for single sheets is formed from a pressure beam carrier with a cross-section and a first paper guide profile
  • the inlet channel for the continuous paper web is formed from a first paper guide profile and a second paper guide profile
  • the common inlet channel is formed from the profiled pressure bar carrier and the second paper guide profile.
  • the pressure beam support form the first paper guide profile and the second paper guide profile in the region of the junction of the common introduction channel a deflection from the horizontal to the vertical.
  • the common insertion channel has a labyrinth which is formed by a tapering, progressively curved arch part of the second paper guide profile, the inner surface of the pressure beam carrier being slightly recessed relative to the pressure beam pressure surface, and a cam projection of the pressure beam carrier, the point of contact with a vertical tangent behind an overhang of the pressure beam.
  • the progressive course of the common insertion channel gives the paper web a pre-bend, which is broken down again in the further course, so that the paper web tip is aimed at the entry position according to the selected distances of the second pair of friction rollers from the pressure bar.
  • a full support of the paper web on the pressure bar printing surface, to a certain extent a pretension of the paper web in the longitudinal direction and transversely to its course, is brought about by the fact that the second pair of friction rollers is also set back by the overhang to the pressure bar.
  • the paper thickness for form webs of different thicknesses can finally be taken into account by horizontally aligning the vertical tangent that runs between the cam projection and the point of contact between the second pair of friction rollers with a vertical tangent of the second paper guide profile measured gap, the common insertion channel being narrowed in the paper insertion direction.
  • the tractor has a coupling unit for coupling and uncoupling.
  • the automation of this coupling unit is designed in such a way that an actuator motor is associated with a drive motor connected to the tractor shaft and the first and second pair of friction rollers or its motor pinion, the movement of which, when electronically activated, serves to disengage or engage the tractor.
  • the actuator motor consists of a stepper motor.
  • a transmission of the clutch movements takes place in that, according to further features of the invention, the motor pinion engages in an intermediate wheel which is rotatably arranged on the tractor shaft and which is provided with a clutch toothing and in which an identical clutch toothing of a clutch sleeve arranged non-rotatably on the tractor shaft engages the tractor shaft is axially displaceable, the axial displacement being effected by means of curve recesses and cam cams which are fixed to the housing and are arranged on a clutch lever.
  • This clutch lever can therefore be adjusted manually or automatically and thereby switch the tractor on or off.
  • the drive transmission of the single sheet feeder is designed in such a way that the idler gear, which is driven on the tractor shaft by the motor pinion, meshes with a toothed roller, from which the drive force can be transmitted to the friction roller pairs by means of toothed belts.
  • the device for paper transport in printers is explained using the example of a matrix printer.
  • the matrix printer has a pressure beam carrier 1 which holds the pressure beam 4 in place.
  • the pressure beam 4 is soundproofed and described in more detail in EP-A-0 221 837.
  • the print bar 4 is opposite the print head 5 at a distance for an ink ribbon, the respective paper web thickness and the given print element lift.
  • a manual single sheet feed 14, a first automatic single sheet feed 15, a second automatic single sheet feed 16 and a tractor 13 for an endless paper web 19 are provided.
  • a (first) pair of friction rollers 9, 10 is arranged in front of the common insertion channel 1b.
  • the pressure beam carrier 1, a first paper guide profile 2 and a second paper guide profile 3 form the insertion channels to be described in more detail.
  • An insertion channel 14a for single sheets 14b together with the first pair of friction rollers 9, 10 and an insertion channel 2a for the continuous paper web 19 together with the tractor are viewed in the paper insertion directions 19a, 14c, 15a and 16a, before an opening 1a of the insertion channel 14a of the single sheets 14b in the Entry channel 2a for the continuous paper web 19 is arranged.
  • the (to be described) drive for the first pair of friction rollers 9, 10 is reversible in the direction of rotation and the (to be described) drive for the tractor 13 is both reversible in the direction of rotation and can be switched on and off by means of a clutch unit 35 (FIGS. 3 to 5).
  • a pull drive 42 is arranged, based on the paper insertion directions 19a, 14c, 15a and 16a, behind the junction 1a and behind the print head 5 and is formed from a second pair of friction rollers 11, 12 becomes.
  • a first paper sensor 7 is arranged in front of the first pair of friction rollers 9, 10 and a second paper sensor 6 behind the junction 1a.
  • the single sheets are transported into the insertion channel 14a by means of take-off rollers 17 and 18.
  • the operation of the device described so far is as follows:
  • the first paper sensor 7 reports "no paper available", as a result of which the electronic control switches on the tractor operation with the continuous paper web 19.
  • the second paper sensor 6 is automatically queried. If there is paper in front of the paper sensor 6, the controller drives the tractor 13 backwards until the paper sensor 6 reports “no paper”. Then a tractor shaft 8 is uncoupled from the drive, so that the tractor 13 is stationary.
  • the controller now reverses the direction of movement and pulls in a single sheet 14b via the first pair of friction rollers 9, 10.
  • the insertion channel 14a for single sheets 14b is formed by the profiled pressure beam support 1, the first profiled paper guide profile 2 and the insertion channel 2a for the continuous paper web 19 is formed from the first paper guide profile 2 and the second paper guide profile 3.
  • the common insertion channel 1b consists of the profiled pressure beam carrier 1 and the second paper guide profile 3.
  • the pressure beam carrier 1, the first paper guide profile 2 and the second paper guide profile 3 form a deflection from the horizontal approximately into the vertical in the region of the junction 1a of the common introduction channel 1b. As shown larger in FIG.
  • a labyrinth 20 is formed in the course of the common insertion channel 1b, which is created by a tapering, progressively curved arch part 3a of the second paper guide profile 3 and a cam projection 1c.
  • the inner surface 1d of the pressure beam support 1 is slightly behind the pressure beam pressure surface 4a.
  • the point of contact with a vertical tangent 38a lags behind an overhang 38 of the pressure beam 4.
  • This geometry further leads to a constant narrowing of the common introduction channel 1b, which is however still limited.
  • a flat contact of the single sheet 14b and the continuous paper web 19 is achieved by moving the second pair of friction rollers 11, 12 back by the projection 38 relative to the pressure beam 4.
  • the limitation of the narrowing of the common insertion channel 1b results from the vertical tangent 38a, which runs between the cam projection 1c and the point of contact of the second friction rollers 11, 12, which with a vertical tangent 3b of the second paper guide profile 3 has a horizontally measured gap corresponding to the fictitious paper web thickness 39 forms, the common insertion channel 1b being narrowed in the paper insertion direction.
  • the actual paper thickness is labeled 40. This actual paper thickness 40 is determined by the maximum number of sheets that Perforation folds etc. of the paper used determined.
  • the labyrinth 20 narrows the common insertion channel 1b to the gap 39.
  • the single sheet 14b or the continuous paper web 19 are guided almost vertically upward with the incoming paper web tip 36 in the labyrinth 20, where they are easily gripped by the second friction rollers 11, 12 and tensioned Paper web 37 is pulled over the pressure bar pressure surface 4a.
  • Multi-layer mold sets and rigid perforations are hardly affected by the labyrinth 20.
  • the clutch unit 35 (FIGS. 3 to 5) has a motor pinion 21 which drives both the tractor shaft 8 and a toothed roller 22 via an intermediate wheel 23.
  • the drive force is transmitted from the toothed roller 22 to the friction roller pairs 9, 10 and 11, 12 by means of toothed belt 43 (not shown in more detail).
  • the main drive motor connected to the motor pinion 21 (not shown in more detail) is assigned an actuator motor 29 which is flanged to a housing 44 which also accommodates a gear train consisting of the drive pinion 30a, the gearwheel 30b with a stepped gearwheel 30c and an idler gear 30d.
  • the housing 44 is flanged to a side wall 24 of the printer.
  • the intermediate wheel 30d engages in a toothing 26a of a clutch lever 26, which can be operated by hand or via the actuator motor 29.
  • the coupling sleeve 25 now has an axial coupling toothing 28 and the intermediate wheel has a corresponding axial coupling toothing 28a.
  • the tractor shaft 8 has a hexagon drive 32. Depending on the direction of movement 34, the tractor 13 is driven or not.
  • the direction of movement is determined by cam recesses 33a arranged on the housing 44 or by cam cams 26b, the stroke of which must be greater than the tooth height engagement of the coupling toothing 28a.
  • cam recesses 33a arranged on the housing 44 or by cam cams 26b, the stroke of which must be greater than the tooth height engagement of the coupling toothing 28a.
  • the coupling sleeve 25 is normally held by means of the compression spring 31, which is supported against a collar 8a of the tractor shaft 8, in the engagement of the clutch teeth 28 and 28a, so that the clutch unit 35 is switched to tractor operation.

Landscapes

  • Handling Of Sheets (AREA)
  • Advancing Webs (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Handling Of Cut Paper (AREA)
  • Handling Of Continuous Sheets Of Paper (AREA)

Claims (13)

  1. Dispositif pour le transport du papier dans des imprimantes comportant un appui d'impression (4) en forme de poutre, notamment dans des imprimantes à matrice, avec chaque fois au moins un canal d'alimentation distinct pour les feuilles séparées (14b) successives et une bande continue de papier (19), un organe de traction (13) étant prévu pour la bande continue de papier et la présence d'une feuille distincte ou d'une bande continue de papier étant détectée par des capteurs (6, 7), le canal d'alimentation (2a) de la bande continue de papier (19) et l'organe de traction (13) se trouvant en amont de l'embouchure (1a) du canal d'alimentation (14a) des feuilles séparées (14b) dans le canal d'alimentation commun (1b), lorsqu'on regarde dans la direction de passage du papier (19a), et le moyen d'entraînement d'une première paire de rouleaux de friction (9, 10) étant réversible en sens de rotation et l'entraînement de l'organe de traction (13) étant à la fois réversible dans son sens de rotation et pouvant également se mettre en oeuvre ou se mettre hors service, dispositif caractérisé en ce que le canal d'alimentation (14a) des feuilles séparées en amont de l'embouchure dans le canal d'alimentation commun (1b) comporte la première paire de rouleaux de friction (9, 10).
  2. Dispositif selon la revendication 1, caractérisé en ce que dans la direction d'alimentation de papier (19a, 14c, 15a, 16a), derrière l'embouchure (1a) et derrière une tête d'impression (5), on a un moyen d'entraînement en traction (42).
  3. Dispositif selon la revendication 2, caractérisé en ce que le moyen d'entraînement en traction (42) est formé par une seconde paire de rouleaux de friction (11, 12).
  4. Dispositif selon les revendications 1 à 3, caractérisé en ce qu'en amont de la première paire de rouleaux de friction (9, 10), dans la direction d'alimentation du papier (14c, 15a, 16a), on a un premier détecteur de papier (7) et derrière l'embouchure (1a), il est prévu un second détecteur de papier (6).
  5. Dispositif selon les revendications 1 à 4, caractérisé en ce que le canal d'alimentation (14a) des feuilles séparées (14b) se compose d'un support de poutre d'impression (1) à section profilée et d'un premier profilé de guidage de papier (2), le canal d'alimentation (2a) de la bande continue de papier (19) se compose d'un premier profilé de guidage de papier (2) et d'un second profilé de guidage de papier (3) et le canal d'alimentation commun (1b) est formé du support profilé (1) de la poutre d'impression et du second profilé de guidage de papier (3).
  6. Dispositif selon la revendication 5, caractérisé en ce que le support de la poutre d'impression (1), le premier profilé de guidage de papier (2) et le second profilé de guidage de papier (3) forment au niveau de l'embouchure (1a) du canal d'alimentation commun (1b), une déviation allant de la direction horizontale à la direction verticale.
  7. Dispositif selon les revendications 5 et 6, caractérisé en ce que le canal commun d'alimentation (1b) comporte un labyrinthe (20) formé par une partie d'arc (3b) du second profilé de guidage de papier (3), qui est courbée de manière progressive, en s'atténuant et la surface inférieure (1d) du support (1) de la poutre d'impression est légèrement en retrait par rapport à la surface d'impression (4a) de la poutre d'impression et par une saillie en forme de came (1c) du support (1) de la poutre d'impression, le point de contact avec une tangente verticale (38a) étant en retrait d'un débordement (38) de la poutre d'impression (4).
  8. Dispositif selon les revendications 5 à 7, caractérisé en ce que la seconde paire de rouleaux de friction (11, 12) est également en retrait par rapport à la poutre d'impression (4), de la partie de débordement (38).
  9. Dispositif selon les revendications 5 à 8, caractérisé en ce que la tangente verticale (38a) qui passe entre la saillie en forme de came (1c) et le point de contact entre la seconde paire de rouleaux de friction (11, 12) en formant un intervalle (39) avec une tangente verticale (3b) du second profilé de guidage de papier (3) qui, mesurée dans la direction horizontale, correspond à l'épaisseur fictive de la bande de papier, le canal d'alimentation commun (1b) étant rétréci dans la direction d'alimentation du papier.
  10. Dispositif selon les revendications 1 à 4, caractérisé en ce que à un moteur d'entraînement ou à son pignon (21), relié à l'axe (8) de l'organe de traction et à la première et la seconde paire de rouleaux de friction (9, 10 ; 11, 12), est associé un moteur d'entraînement de positionnement (29), dont le mouvement sert en commande électronique à l'embrayage ou au débrayage de l'organe de traction (13).
  11. Dispositif selon les revendications 1 à 4 et 10, caractérisé en ce que le moteur d'entraînement de positionnement (29) est un moteur pas à pas.
  12. Dispositif selon les revendications 1 à 4, 10 et 11, caractérisé en ce que le pignon (21) du moteur principal engrène avec une roue intermédiaire (23) montée à rotation sur l'axe (8) de l'organe de traction, cette roue étant munie d'une denture d'embrayage (28a) et en ce que cette denture reçoit en prise une denture d'embrayage identique (28) d'un manchon d'embrayage (25) non mobile en rotation sur l'axe (8) de l'organe de traction, ce manchon étant coulissant axialement sur l'axe (8) de l'organe de traction, en étant soumis à l'action d'un ressort et la translation axiale se fait grâce à des cavités de courbe (33a) et des cames de courbe (26b) solidaires du boîtier, moyens qui sont prévus sur un levier d'embrayage (26).
  13. Dispositif selon les revendications 1 à 4 et 10 à 12, caractérisé par une roue intermédiaire (23) entraînée sur l'axe (8) du tracteur par le pignon (21) du moteur, cette roue intermédiaire engrénant avec un cylindre denté (22) dont la force d'entraînement est transmise respectivement par des courroies crantées (43) aux paires de rouleaux de friction (9, 10 ; 11, 12).
EP87101954A 1986-03-04 1987-02-12 Dispositif d'alimentation du papier dans les imprimantes à barres d'appui, en particulier des imprimantes matricielles Expired - Lifetime EP0235633B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87101954T ATE63859T1 (de) 1986-03-04 1987-02-12 Vorrichtung fuer den papiertransport in druckern mit balkenfoermigem druckwiderlager, insbesondere in matrixdrucker.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3607080 1986-03-04
DE19863607080 DE3607080A1 (de) 1986-03-04 1986-03-04 Vorrichtung fuer den papiertransport in druckern mit balkenfoermigem druckwiderlager, insbesondere in matrixdruckern

Publications (3)

Publication Number Publication Date
EP0235633A2 EP0235633A2 (fr) 1987-09-09
EP0235633A3 EP0235633A3 (en) 1988-07-13
EP0235633B1 true EP0235633B1 (fr) 1991-05-29

Family

ID=6295467

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87101954A Expired - Lifetime EP0235633B1 (fr) 1986-03-04 1987-02-12 Dispositif d'alimentation du papier dans les imprimantes à barres d'appui, en particulier des imprimantes matricielles

Country Status (5)

Country Link
US (1) US4789258A (fr)
EP (1) EP0235633B1 (fr)
JP (1) JPS62225377A (fr)
AT (1) ATE63859T1 (fr)
DE (2) DE3607080A1 (fr)

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DE3607080A1 (de) 1987-09-10
DE3607080C2 (fr) 1988-04-14
ATE63859T1 (de) 1991-06-15
DE3770290D1 (de) 1991-07-04
JPS62225377A (ja) 1987-10-03
US4789258A (en) 1988-12-06
EP0235633A2 (fr) 1987-09-09
EP0235633A3 (en) 1988-07-13

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