EP0184234A1 - Multicolour printer - Google Patents

Multicolour printer Download PDF

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Publication number
EP0184234A1
EP0184234A1 EP85201736A EP85201736A EP0184234A1 EP 0184234 A1 EP0184234 A1 EP 0184234A1 EP 85201736 A EP85201736 A EP 85201736A EP 85201736 A EP85201736 A EP 85201736A EP 0184234 A1 EP0184234 A1 EP 0184234A1
Authority
EP
European Patent Office
Prior art keywords
ribbon
printing
printer according
print head
paper
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.)
Withdrawn
Application number
EP85201736A
Other languages
German (de)
French (fr)
Inventor
Jorge Costa
Adrien Zahner
Félix Zurita
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.)
Hermes Precisa International SA
Original Assignee
Hermes Precisa International SA
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 Hermes Precisa International SA filed Critical Hermes Precisa International SA
Publication of EP0184234A1 publication Critical patent/EP0184234A1/en
Withdrawn legal-status Critical Current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
    • B41J35/00—Other apparatus or arrangements associated with, or incorporated in, ink-ribbon mechanisms
    • B41J35/16—Multicolour arrangements
    • B41J35/18—Colour change effected automatically
    • 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/325—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads by selective transfer of ink from ink carrier, e.g. from ink ribbon or sheet
    • 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
    • B41J35/00—Other apparatus or arrangements associated with, or incorporated in, ink-ribbon mechanisms
    • B41J35/22—Mechanisms permitting the selective use of a plurality of ink ribbons

Definitions

  • the present invention relates to a printer for the simultaneous printing of an entire line comprising a print medium on which a sheet or strip of paper or other material to be printed is applied during printing, a print head. printing on which a multitude of printing members are arranged essentially along a line, an ink ribbon of a width corresponding substantially to the width of the printing head and a transport mechanism intended to move the paper in a perpendicular direction to said line, the ribbon being, in the printing position, inserted between the paper and the printing members and moved in said direction perpendicular to the line.
  • Such printers are generally known using a thermal printing head as described in European patent application No. 86.661.
  • printers For polychromic printing line by line, known printers generally have several printheads arranged one after the other and each having an ink ribbon of a different color. Such printers are described, inter alia, in US Patent 4,447,818 or in German application DE-OS 33.05.491, and include a transport mechanism for moving paper from one printing station to the next. Polychromic printers of this type are of a high cost price considering the cost of linear thermal print heads. In addition, the exact superimposition of the printing of the different colors is difficult to achieve and requires particularly severe construction requirements with regard to the paper transport mechanism.
  • Polychromic line by line printers which have only one print head and an ink ribbon having portions of different colors arranged one after the other. These printers, known as the "harlequin" type, are constructively simpler to produce, however causing a great loss of ink ribbon, hence a high cost of use.
  • the object of the present invention is to remedy these drawbacks by creating an accurate and reliable printer, while reducing consumption of ink ribbons to a minimum.
  • the printer according to the invention is characterized, for this purpose, in that it comprises at least one other ink ribbon and a changer device intended to exchange and place one or the other of the ink ribbons at said printing position.
  • the printer illustrated in FIGS. 1 and 2 comprises a printing medium in the form of a cylinder 2 made of aluminum profile covered with an elastomer coating 3.
  • the printer is fed with sheets of paper to be printed along 'an inclined plane 4 and these are stored in a tray 5 after printing.
  • the cylinder 2 is rotatably mounted by a shaft 6 in the frame 7 and includes a paper clamp mechanism 8.
  • the latter comprises an elastic metal blade 9 in the form of a comb fixed by one of its sides over its entire length to the profile of the cylinder 2
  • the teeth of the comb are provided on the one hand with supporting parts 10 which are urged elastically against the cylinder 2 and making it possible to maintain the sheet on the latter and, on the other hand, with abutment parts 11 intended to stop a sheet in a precise position when it is inserted into the printer.
  • the opening and closing movement of the elastic blade 9 is controlled by a cam 12, the pivot shaft 18 of which is integral with the cylinder 2.
  • This cam 12 carries a control finger 13 having a stud 14 capable of cooperating with a stop 15 pivotally mounted around a shaft 16 secured to the frame 7.
  • a rod 17 determines a rest position for the stop 15.
  • the printer further comprises a control bar 20 retractably mounted on the frame 7 and intended to control the opening of the paper-clamp mechanism 8 when a sheet is printed by cooperating with the finger 13, as illustrated in broken lines in FIG. 1.
  • the mechanism 8 is provided with a second elastic blade 21 in the form of a comb, the teeth of which occupy the interstices between the abutment pieces 11. Fixed on one side with the blade 9 to the cylinder 2, this blade 21 is applied by its other side in the sheet insertion position against the cylinder 2, as illustrated in FIG. 1.
  • the printer further comprises a guide screen 22 having grooves for the passage of the raised teeth of the metal blade 9. This screen guides the separate sheet to the tray 5.
  • a backpressure roller 23 allows the transport of the sheet to this tray 5, when released by the paper clip mechanism 8.
  • the print head 30 of the printer is provided with a number of heating elements 33 arranged in line.
  • Each element 33 is connected to a control unit, not illustrated, controlling the passage of an electric current in some of the elements at a given time, which heats them and causes the thermal transfer of ink from an ink ribbon 31 onto the paper to be printed.
  • This printhead 30 is mounted on pivoting arms 32 controlled by a motor not shown and intended to apply the heating elements 33 with a determined pressure against the ink ribbon 31 and to retract the printhead as illustrated in lines interrupted 34.
  • the printer is provided with a changing device 40 intended to exchange and to place one or the other of the ink ribbons 31 in the printing position.
  • This device comprises a conveyor mechanism constituted by two notched belts 41 connected by four rods 42 to ensure their parallel movement. These belts 41 are each mounted on four rollers 43 with notched periphery having common shafts 44 mounted in bearings 52 provided on the frame 7. One of the shafts 44 is driven by a stepping motor 45.
  • Four organs of attachment 46 for cassettes 55 are mounted on the two belts 41 which constitute a substantially rectangular changer circuit.
  • These fixing members 46 comprise two lateral plates 47 (fig. 2) connected by two spacers 48. Each of the plates 47 is held at one of the belts 41 by two pins 49, 50 integral with the latter. One 49 of the pins crosses the plate 47 through a hole and serves as a pivot shaft, while the other pin 50 is capable of sliding in a slot 51 of the plate 47 so as to allow the passage of the angles of the circuit rectangular.
  • the printer is intended for polychromic printing - in four colors and includes, for this purpose, four ink ribbons 31 for printing in black, yellow, cyane and magenta. These ribbons are contained in four cassettes 55, a copy of which is shown in FIG. 3. In these cassettes, the ink ribbon 31 is unwound from a supply reel 56, passes in front of a window 57 and is wound on a take-up reel 58. This the latter is integral with a wheel 59 capable of cooperating in the friction printing position with a drive wheel 60, itself driven by the cylinder 2 thanks to a belt 61.
  • Each of the cassettes 55 made of synthetic material, has retaining flanges 62 intended to engage frictionally on the two spacers 48 allowing it to be mounted on the fixing members 46.
  • the printer works as follows. In the non-use position, the print head 30 is in the position 34 illustrated in broken lines in FIG. 1 and the paper-clip mechanism 8 is open. Following a paper feed command, a sheet is supplied along the inclined plane 4 and stopped by the stop pieces 11 in a precise position. The cylinder - 2 is then turned 9 ° backwards in the opposite direction clockwise. The stud 14 being in contact with the pivoting stop 15, the cam 12 is turned around its shaft 18 until its flat face 19 is opposite the elastic blade 19 which then clamps the sheet between the pieces of support 10 and cylinder 2. The latter can then be rotated in the direction indicated by the arrow, until the sheet is in the printing position.
  • the stepping motor 45 is started to transport the cassette 55 containing the appropriate ribbon to the printing position.
  • the print head 30 is then pivoted to penetrate into the center of the cassette 55, where it is put in place so that its heating elements 33 press the ink ribbon 31 through the window 31 with a determined pressure against the disposed paper on cylinder 2.
  • Printing can then take place line by line by simultaneous heating of some of the elements for a line at a given time.
  • the head 30 is removed by a few millimeters from the cylinder 2 so that the ink ribbon 31 is no longer applied against the paper.
  • the cylinder 2 can then rotate freely without the ink ribbon 31 being advanced.
  • the friction force of the drive between the wheel 60 and the wheel 59 is chosen so that the ink ribbon 31 is only advanced when the print head 30 applies the ribbon 31 against the cylinder 2 and when the latter is rotated in the direction of the arrow. This friction force is however too low to advance the ribbon 31, when the latter is not applied against the paper and assisted in its movement by the rotation of the cylinder 2.
  • control bar 20 is retracted so as not to control the opening of the paper-clip mechanism 8 if a new color is to be applied.
  • the stud 14 raises the pivoting stop 15 in the passage without the position of the cam 12 being changed.
  • the head 30 is retracted and the motor 45 of the ribbon changer device 40 is started to place, if necessary, another ink ribbon in the printing position and so on.
  • the control bar 20 While the last desired color is being printed, the control bar 20 is advanced so as to cooperate with the finger 13. Passing near this bar 20, the cam 12 is pivoted and first raises the blade 9 to release the sheet and then the exploding blade 21.
  • the shape of the cam 12 is given so that it comes back to be immobilized in the second rest position determined by the flat face 24 facing the elastic blade 9 In this rest position, the paper clamp mechanism 8 is open, but the expulsion blade 21 is pressed against the cylinder, as shown in FIG. 1.
  • the teeth of the raised blade 9 then pass through the grooves of the guide screen 22. Arrived at the angular position illustrated in FIG. 1, a new sheet can be introduced since the paper-clip mechanism 8 is open.
  • the second embodiment illustrated in FIG. 4 has a print medium identical to the first embodiment, but is distinguished from the latter by the tape changer device 70.
  • This device consists of a drum 71 comprising two lateral flanges 72 connected by four rods or spacers 73.
  • Four cassettes 74 containing the ink ribbons 31 are provided with projecting portions 75 engaging with greasy friction on the rods 73.
  • the two flanges 72 are each carried by three rollers 76, the shafts 77 of which are mounted in the frame of the printer.
  • a toothed belt 78 allows the rotation of the drum controlled by a stepping motor 79.
  • the central part of the two flanges 72 has a circular opening 80 intended for the passage of a control arm 81 ensuring the establishment and removing the print head 30.
  • the cassettes 74 also include a front window 82 through which the ink ribbon 31 can be applied against the paper.
  • the printing medium could be constituted by a flat carriage carrying out a linear movement back and forth. Changing devices could be provided for a different number of ink ribbon cassettes.
  • the print head could be of a completely different type of operation, for example a print head with needles arranged essentially along a line.

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  • Impression-Transfer Materials And Handling Thereof (AREA)
  • Electronic Switches (AREA)

Abstract

L'imprimante comprend une tête d'impression (30) avec une multitude d'organes d'impresson (33) arrangés essentiellement suivant une ligne, un cylindre d'impression (2), sur lequel une feuille de papier peut être maintenue grâce à un mécanisme serre-papier (8), et un dispositif changeur (40) de ruban encreur. Quatre rubans encreurs (31) sont contenus dans des cassettes (55) fixées de façon amovible sur des organes de fixation (46) montés sur deux courroies crantées (41). Ces courroies crantées disposées en circuit rectangulaire et entraînées par un moteur (45) permettent de changer rapidement le ruban (31) et assurent une impression polychromique précise.The printer comprises a printhead (30) with a multitude of imprint members (33) arranged essentially along a line, a printing cylinder (2), on which a sheet of paper can be maintained by a paper clip mechanism (8), and an ink ribbon changer (40). Four ink ribbons (31) are contained in cassettes (55) removably attached to fasteners (46) mounted on two toothed belts (41). These notched belts arranged in a rectangular circuit and driven by a motor (45) make it possible to quickly change the ribbon (31) and ensure precise polychromic printing.

Description

La présente invention concerne une imprimante pour l'impression simultanée d'une ligne entière comprenant un support d'impression sur lequel une feuille ou une bande de papier ou d'un autre matériau à imprimer est appliquée pendant l'impression, une tête d'impression sur laquelle une multitude d'organes d'impression sont disposés essentiellement suivant une ligne, un ruban encreur d'une largeur correspondant sensiblement à la largeur de la tête d'impression et un mécanisme de transport destiné à déplacer le papier suivant une direction perpendiculaire à ladite ligne, le ruban étant, en position d'impression, inséré entre le papier et les organes d'impression et déplacé suivant ladite direction perpendiculaire à la ligne.The present invention relates to a printer for the simultaneous printing of an entire line comprising a print medium on which a sheet or strip of paper or other material to be printed is applied during printing, a print head. printing on which a multitude of printing members are arranged essentially along a line, an ink ribbon of a width corresponding substantially to the width of the printing head and a transport mechanism intended to move the paper in a perpendicular direction to said line, the ribbon being, in the printing position, inserted between the paper and the printing members and moved in said direction perpendicular to the line.

On connaît de telles imprimantes utilisant généralement une tête d'impression thermique telle que décrite dans la demande de brevet européen N° 86.661.Such printers are generally known using a thermal printing head as described in European patent application No. 86.661.

Pour l'impression polychromique ligne par ligne, les imprimantes connues comportent généralement plusieurs têtes d'impression arrangées les unes à la suite des autres et présentant chacune un ruban encreur d'une couleur différente. De telles imprimantes sont décrites, entre autres, dans le brevet US-4.447.818 ou dans la demande allemande DE-OS 33.05.491, et comprennent un mécanisme de transport pour déplacer le papier d'une station d'impression à la suivante. Les imprimantes polychromiques de ce type sont d'un prix de revient élevé vu le coût des têtes d'impression thermiques linéaires. En outre, la superposition exacte de l'impression des différentes couleurs est difficile à réaliser et demande des exigences constructives particulièrement sévères en ce qui concerne le mécanisme de transport du papier.For polychromic printing line by line, known printers generally have several printheads arranged one after the other and each having an ink ribbon of a different color. Such printers are described, inter alia, in US Patent 4,447,818 or in German application DE-OS 33.05.491, and include a transport mechanism for moving paper from one printing station to the next. Polychromic printers of this type are of a high cost price considering the cost of linear thermal print heads. In addition, the exact superimposition of the printing of the different colors is difficult to achieve and requires particularly severe construction requirements with regard to the paper transport mechanism.

On connaît également des imprimantes polychromiques ligne par ligne ne comportant qu'une seule tête d'impression et un ruban encreur présentant des portions de différentes couleurs arrangées les unes à la suite des autres. Ces imprimantes, dites du type "arlequin", sont constructivement plus simples à réaliser, engendrant cependant une grande perte en ruban encreur, d'où un prix d'utilisation élevé.Polychromic line by line printers are also known which have only one print head and an ink ribbon having portions of different colors arranged one after the other. These printers, known as the "harlequin" type, are constructively simpler to produce, however causing a great loss of ink ribbon, hence a high cost of use.

Le but de la présente invention est de remédier à ces inconvénients en créant une imprimante précise et fiable, tout en réduisant à un minimum la consommation en rubans encreurs. L'imprimante selon l'invention est caractérisée, à cet effet, en ce qu'elle comprend au moins un autre ruban encreur et un dispositif changeur destiné à échanger et à mettre en place l'un ou l'autre des rubans encreurs à ladite position d'impression.The object of the present invention is to remedy these drawbacks by creating an accurate and reliable printer, while reducing consumption of ink ribbons to a minimum. The printer according to the invention is characterized, for this purpose, in that it comprises at least one other ink ribbon and a changer device intended to exchange and place one or the other of the ink ribbons at said printing position.

L'invention est exposée ci-après plus en détail à l'aide de dessins représentant, schématiquement et à titre d'exemple, deux formes d'exécution.

  • La figure 1 représente une vue en coupe latérale de la première forme d'exécution.
  • La figure 2 est une vue selon la ligne II-II de la figure 1.
  • La figure 3 représente une vue en perspective d'une cassette.
  • La figure 4 est une vue en coupe latérale de la deuxième forme d'exécution.
The invention is set out below in more detail with the aid of drawings showing, schematically and by way of example, two embodiments.
  • Figure 1 shows a side sectional view of the first embodiment.
  • Figure 2 is a view along line II-II of Figure 1.
  • Figure 3 shows a perspective view of a cassette.
  • Figure 4 is a side sectional view of the second embodiment.

L'imprimante illustrée aux figures 1 et 2 comprend un support d'impression sous forme d'un cylindre 2 en profilé d'aluminium recouvert d'un revêtement en élastomère 3. L'imprimante est alimentée en feuilles de papier à imprimer le long d'un plan incliné 4 et ces dernières sont stockées dans un bac 5 après l'impression. Le cylindre 2 est monté rotatif par un arbre 6 dans le bâti 7 et comporte un mécanisme serre-papier 8. Ce dernier comprend une lame métallique élastique 9 en forme de peigne fixé par un de ses côtés sur toute sa longueur au profilé du cylindre 2. Les dents du peigne sont munies d'une part de pièces d'appui 10 sollicitées élastiquement contre le cylindre 2 et permettant de maintenir la feuille sur ce dernier et, d'autre part, de pièces de butée 11 destinées à arrêter une feuille dans une position précise lors de son introduction dans l'imprimante. Le mouvement d'ouverture et de fermeture de la lame élastique 9 est commandé par une came 12 dont l'arbre de pivotement 18 est solidaire du cylindre 2. Cette came 12 porte un doigt de commande 13 présentant un téton 14 susceptible de coopérer avec une butée 15 montée pivotante autour d'un arbre 16 solidaire du bâti 7.The printer illustrated in FIGS. 1 and 2 comprises a printing medium in the form of a cylinder 2 made of aluminum profile covered with an elastomer coating 3. The printer is fed with sheets of paper to be printed along 'an inclined plane 4 and these are stored in a tray 5 after printing. The cylinder 2 is rotatably mounted by a shaft 6 in the frame 7 and includes a paper clamp mechanism 8. The latter comprises an elastic metal blade 9 in the form of a comb fixed by one of its sides over its entire length to the profile of the cylinder 2 The teeth of the comb are provided on the one hand with supporting parts 10 which are urged elastically against the cylinder 2 and making it possible to maintain the sheet on the latter and, on the other hand, with abutment parts 11 intended to stop a sheet in a precise position when it is inserted into the printer. The opening and closing movement of the elastic blade 9 is controlled by a cam 12, the pivot shaft 18 of which is integral with the cylinder 2. This cam 12 carries a control finger 13 having a stud 14 capable of cooperating with a stop 15 pivotally mounted around a shaft 16 secured to the frame 7.

Une tige 17 détermine une position de repos pour la butée 15. L'imprimante comprend en outre une barre de commande 20 montée de façon rétractable sur le bâti 7 et destinée à commander l'ouverture du mécanisme serre-papier 8 lorsqu'une feuille est imprimée en coopérant avec le doigt 13, tel qu'illustré en traits interrompus à la figure 1. Pour empêcher qu'une feuille de papier reste collée sur le cylindre 2 après l'impression, le mécanisme 8 est muni d'une seconde lame élastique 21 en forme de peigne dont les dents occupent les interstices entre les pièces de butée 11. Fixée d'un côté avec la lame 9 au cylindre 2, cette lame 21 est appliquée par son autre côté dans la position d'introduction de feuille contre le cylindre 2, tel qu'illustré à la figure 1. Lors du passage du doigt de commande 13 sur la barre de commande 20, non seulement la lame 9, mais également la seconde lame 21,--ésf- levée pour dégager la feuille imprimée du cylindre 2. Après que le doigt 13 a passé la barre 20, la came 12, soumise à la force élastique des deux lames métalliques 9 et 21, retourne de quelques degrés en arrière dans le sens contraire aux aiguilles d'une montre pour rester dans une seconde position de repos déterminée par la surface plane 24.A rod 17 determines a rest position for the stop 15. The printer further comprises a control bar 20 retractably mounted on the frame 7 and intended to control the opening of the paper-clamp mechanism 8 when a sheet is printed by cooperating with the finger 13, as illustrated in broken lines in FIG. 1. To prevent a sheet of paper from sticking to the cylinder 2 after printing, the mechanism 8 is provided with a second elastic blade 21 in the form of a comb, the teeth of which occupy the interstices between the abutment pieces 11. Fixed on one side with the blade 9 to the cylinder 2, this blade 21 is applied by its other side in the sheet insertion position against the cylinder 2, as illustrated in FIG. 1. When the control finger 13 passes over the control bar 20, not only the blade 9, but also the second blade 21, - lifted to release the printed sheet of cylinder 2. After finger 13 has passed bar 20, the c core 12, subjected to the elastic force of the two metal blades 9 and 21, returns a few degrees back in an anti-clockwise direction to remain in a second rest position determined by the flat surface 24.

L'imprimante comprend en outre un écran de guidage 22 ayant des rainures pour le passage des dents levées de la lame métallique 9. Cet écran guide la feuille séparée vers le bac 5. Un rouleau de contrepression 23 permet le transport de la feuille vers ce bac 5, lorsqu'elle est libérée par le mécanisme serre-papier 8.The printer further comprises a guide screen 22 having grooves for the passage of the raised teeth of the metal blade 9. This screen guides the separate sheet to the tray 5. A backpressure roller 23 allows the transport of the sheet to this tray 5, when released by the paper clip mechanism 8.

La tête d'impression 30 de l'imprimante est munie d'un certain nombre d'éléments chauffants 33 disposés en ligne. Chaque élément 33 est relié à une unité de commande, non illustrée, contrôlant le passage d'un courant électrique dans certains des éléments à un moment donné, ce qui les chauffe et provoque le transfert thermique d'encre d'un ruban encreur 31 sur le papier à imprimer. Cette tête d'impression 30 est montée sur des bras pivotants 32 commandés par un moteur non illustré et destinés à appliquer les éléments chauffants 33 avec une pression déterminée contre le ruban encreur 31 et à escamoter la tête d'impression tel qu'illustré en traits interrompus 34.The print head 30 of the printer is provided with a number of heating elements 33 arranged in line. Each element 33 is connected to a control unit, not illustrated, controlling the passage of an electric current in some of the elements at a given time, which heats them and causes the thermal transfer of ink from an ink ribbon 31 onto the paper to be printed. This printhead 30 is mounted on pivoting arms 32 controlled by a motor not shown and intended to apply the heating elements 33 with a determined pressure against the ink ribbon 31 and to retract the printhead as illustrated in lines interrupted 34.

L'imprimante est munie d'un dispositif changeur 40 destiné à échanger et à mettre en place l'un ou l'autre des rubans encreurs 31 à la position d'impression. Ce dispositif comprend un mécanisme convoyeur constitué par deux courroies crantées 41 reliées par quatre tiges 42 pour assurer leur déplacement parallèle. Ces courroies 41 sont chacune montées sur quatre galets 43 à périphérie crantée ayant des arbres 44 communs montés dans des paliers 52 prévus sur le bâti 7. L'un des arbres 44 est entraîné par un moteur pas-à-pas 45. Quatre organes de fixation 46 pour des cassettes 55 sont montés sur les deux courroies 41 qui constituent un circuit changeur sensiblement rectangulaire. Ces organes de fixation 46 comportent deux plaques latérales 47 (fig. 2) reliées par deux entretoises 48. Chacune des plaques 47 est maintenue à l'une des courroies 41 par deux goupilles 49, 50 solidaires de cette dernière. L'une 49 des goupilles traverse la plaque 47 par un trou et sert d'arbre de pivotement, tandis que l'autre goupille 50 est susceptible de coulisser dans une fente 51 de la plaque 47 de façon à permettre le passage des angles du circuit rectangulaire.The printer is provided with a changing device 40 intended to exchange and to place one or the other of the ink ribbons 31 in the printing position. This device comprises a conveyor mechanism constituted by two notched belts 41 connected by four rods 42 to ensure their parallel movement. These belts 41 are each mounted on four rollers 43 with notched periphery having common shafts 44 mounted in bearings 52 provided on the frame 7. One of the shafts 44 is driven by a stepping motor 45. Four organs of attachment 46 for cassettes 55 are mounted on the two belts 41 which constitute a substantially rectangular changer circuit. These fixing members 46 comprise two lateral plates 47 (fig. 2) connected by two spacers 48. Each of the plates 47 is held at one of the belts 41 by two pins 49, 50 integral with the latter. One 49 of the pins crosses the plate 47 through a hole and serves as a pivot shaft, while the other pin 50 is capable of sliding in a slot 51 of the plate 47 so as to allow the passage of the angles of the circuit rectangular.

L'imprimante est prévue pour l'impression polychromique - à quatre couleurs et comporte, à cet effet, quatre rubans encreurs 31 pour l'impression en noir, jaune, cyane et magenta. Ces rubans sont contenus dans quatre cassettes 55 dont un exemplaire est représenté à la figure 3. Dans ces cassettes, le ruban encreur 31 est déroulé d'une bobine débitrice 56, passe devant une fenêtre 57 et est enroulé sur une bobine réceptrice 58. Cette dernière est solidaire d'une molette 59 susceptible de coopérer dans la position d'impression par friction avec une roue d'entraînement 60, elle-même entraînée par le cylindre 2 grâce à une courroie 61. Chacune des cassettes 55, en matière synthétique, présente des collerettes de retenue 62 destinées a s'engager à friction sur les deux entretoises 48 permettant son montage sur les organes de fixation 46.The printer is intended for polychromic printing - in four colors and includes, for this purpose, four ink ribbons 31 for printing in black, yellow, cyane and magenta. These ribbons are contained in four cassettes 55, a copy of which is shown in FIG. 3. In these cassettes, the ink ribbon 31 is unwound from a supply reel 56, passes in front of a window 57 and is wound on a take-up reel 58. This the latter is integral with a wheel 59 capable of cooperating in the friction printing position with a drive wheel 60, itself driven by the cylinder 2 thanks to a belt 61. Each of the cassettes 55, made of synthetic material, has retaining flanges 62 intended to engage frictionally on the two spacers 48 allowing it to be mounted on the fixing members 46.

L'imprimante fonctionne de la façon suivante. En position de non-utilisation, la tête d'impression 30 se trouve dans la position 34 ilustrée en traits interrompus à la figure 1 et le mécanisme serre-papier 8 est ouvert. Suite à une commande d'introduction de papier, une feuille est fournie le long du plan incliné 4 et arrêté par les pièces de butée 11 dans une position précise. Le cylindre -2 est alors tourné de 9° vers l'arrière dans le sens contraire aux aiguilles d'une montre. Le téton 14 étant en contact avec la butée pivotante 15, la came 12 est tournée autour de son arbre 18 jusqu'à ce que sa face plate 19 se trouve en regard de la lame élastique 19 qui pince alors la feuille entre les pièces d'appui 10 et le cylindre 2. Ce dernier peut alors être tourné dans le sens indiqué par la flèche, jusqu'à ce que la feuille se trouve en position d'impression.The printer works as follows. In the non-use position, the print head 30 is in the position 34 illustrated in broken lines in FIG. 1 and the paper-clip mechanism 8 is open. Following a paper feed command, a sheet is supplied along the inclined plane 4 and stopped by the stop pieces 11 in a precise position. The cylinder - 2 is then turned 9 ° backwards in the opposite direction clockwise. The stud 14 being in contact with the pivoting stop 15, the cam 12 is turned around its shaft 18 until its flat face 19 is opposite the elastic blade 19 which then clamps the sheet between the pieces of support 10 and cylinder 2. The latter can then be rotated in the direction indicated by the arrow, until the sheet is in the printing position.

A la suite d'une commande d'impression pour une couleur donnée, le moteur pas-à-pas 45 est mis en marche pour transporter la cassette 55 contenant le ruban adéquat en position d'impression. La tête d'impression 30 est alors pivotée pour pénétrer dans le centre de la cassette 55, où elle est mise en place de façon que ses éléments chauffants 33 appuyent le ruban encreur 31 à travers la fenêtre 31 avec une pression déterminée contre le papier disposé sur le cylindre 2. L'impression pourra alors avoir lieu ligne par ligne par échauffement simultané de certains des éléments pour une ligne à un moment donné. Lorsqu'aucun point d'une ligne ne doit être imprimé, la tête 30 est retirée de quelques millimètres du cylindre 2 de façon que le ruban encreur 31 ne soit plus appliqué contre le papier. Le cylindre 2 pourra alors tourner librement sans que le ruban encreur 31 ne soit avancé. En effet, la force de friction de l'entraînement entre la roue 60 et la molette 59 est choisie de façon que le ruban encreur 31 soit uniquement avancé lorsque la tête d'impression 30 applique le ruban 31 contre le cylindre 2 et lorsque ce dernier est mis en rotation dans le sens de la flèche. Cette force de friction est cependant trop faible pour faire avancer le ruban 31, lorsque ce dernier n'est pas appliqué contre le papier et assisté dans son mouvement par la rotation du cylindre 2.Following a print command for a given color, the stepping motor 45 is started to transport the cassette 55 containing the appropriate ribbon to the printing position. The print head 30 is then pivoted to penetrate into the center of the cassette 55, where it is put in place so that its heating elements 33 press the ink ribbon 31 through the window 31 with a determined pressure against the disposed paper on cylinder 2. Printing can then take place line by line by simultaneous heating of some of the elements for a line at a given time. When no point of a line is to be printed, the head 30 is removed by a few millimeters from the cylinder 2 so that the ink ribbon 31 is no longer applied against the paper. The cylinder 2 can then rotate freely without the ink ribbon 31 being advanced. Indeed, the friction force of the drive between the wheel 60 and the wheel 59 is chosen so that the ink ribbon 31 is only advanced when the print head 30 applies the ribbon 31 against the cylinder 2 and when the latter is rotated in the direction of the arrow. This friction force is however too low to advance the ribbon 31, when the latter is not applied against the paper and assisted in its movement by the rotation of the cylinder 2.

Pendant l'impression, la barre de commande 20 est escamotée de façon à ne pas commander l'ouverture du mécanisme serre-papier 8 si une nouvelle couleur doit être appliquée. Le téton 14 soulève la butée pivotante 15 au passage sans pour autant que la position de la came 12 soit modifiée. Après rotation d'un tour du cylindre 2, la tête 30 est escamotée et le moteur 45 du dispositif changeur de ruban 40 est enclenché pour placer, si nécessaire, un autre ruban encreur en position d'impression et ainsi de suite.During printing, the control bar 20 is retracted so as not to control the opening of the paper-clip mechanism 8 if a new color is to be applied. The stud 14 raises the pivoting stop 15 in the passage without the position of the cam 12 being changed. After rotation of one revolution of the cylinder 2, the head 30 is retracted and the motor 45 of the ribbon changer device 40 is started to place, if necessary, another ink ribbon in the printing position and so on.

Pendant qu'on imprime la dernière couleur désirée, la barre de commande 20 est avancée de façon à coopérer avec le doigt 13. En passant près de cette barre 20, la came 12 est pivotée et soulève d'abord la lame 9 pour libérer la feuille et ensuite la lame d'explusion 21. La forme de la came 12 est donnée de façon qu'elle revienne en arrière pour être immobilisée dans la seconde position de repos déterminée par la face plane 24 se plaçant en regard de la lame élastique 9. Dans cette position de repos, le mécanisme serre-papier 8 est ouvert, mais la lame d'expulsion 21 est appuyée contre le cylindre, tel que représenté à la figure 1. Les dents de la lame 9 soulevée passent alors dans les rainures de l'écran de guidage 22. Arrivé à la position angulaire illustrée à la figure 1, une nouvelle feuille peut être introduite puisque le mécanisme serre-papier 8 est ouvert.While the last desired color is being printed, the control bar 20 is advanced so as to cooperate with the finger 13. Passing near this bar 20, the cam 12 is pivoted and first raises the blade 9 to release the sheet and then the exploding blade 21. The shape of the cam 12 is given so that it comes back to be immobilized in the second rest position determined by the flat face 24 facing the elastic blade 9 In this rest position, the paper clamp mechanism 8 is open, but the expulsion blade 21 is pressed against the cylinder, as shown in FIG. 1. The teeth of the raised blade 9 then pass through the grooves of the guide screen 22. Arrived at the angular position illustrated in FIG. 1, a new sheet can be introduced since the paper-clip mechanism 8 is open.

La deuxième forme d'exécution illustrée à la figure 4 présente un support d'impression identique à la première forme d'exécution, mais se distingue de cette dernière par le dispositif changeur de ruban 70. Ce dispositif est constitué par un tambour 71 comportant deux flasques latéraux 72 reliés par quatre tiges ou entretoises 73. Quatre cassettes 74 contenant les rubans encreurs 31 sont munies de portions en saillie 75 s'engageant à friction gras sur les tiges 73.The second embodiment illustrated in FIG. 4 has a print medium identical to the first embodiment, but is distinguished from the latter by the tape changer device 70. This device consists of a drum 71 comprising two lateral flanges 72 connected by four rods or spacers 73. Four cassettes 74 containing the ink ribbons 31 are provided with projecting portions 75 engaging with greasy friction on the rods 73.

Les deux flasques 72 sont portés chacun par trois galets 76 dont les arbres 77 sont montés dans le bâti de l'imprimante. Une courroie crantée 78 permet la mise en rotation du tambour commandé par un moteur pas-à-pas 79. La partie centrale des deux flasques 72 présente une ouverture circulaire 80 destinée au passage d'un bras de commande 81 assurant la mise en place et le retrait de la tête d'impression 30. Les cassettes 74 comportent également une fenêtre frontale 82 par laquelle le ruban encreur 31 est susceptible d'être appliqué contre le papier. Le fonctionnement de l'imprimante constituée par cette seconde forme d'exécution est identique à celui précédemment décrit.The two flanges 72 are each carried by three rollers 76, the shafts 77 of which are mounted in the frame of the printer. A toothed belt 78 allows the rotation of the drum controlled by a stepping motor 79. The central part of the two flanges 72 has a circular opening 80 intended for the passage of a control arm 81 ensuring the establishment and removing the print head 30. The cassettes 74 also include a front window 82 through which the ink ribbon 31 can be applied against the paper. The operation of the printer constituted by this second embodiment is identical to that previously described.

Il est bien entendu que le mode de réalisation décrit ne présente aucun caractère limitatif. En particulier, le support d'impression pourrait être constitué par un chariot plan effectuant un mouvement linéaire de va-et-vient. Des dispositifs changeurs pourraient être prévus pour un nombre différent de cassettes à ruban encreur. La tête d'impression pourrait être d'un tout autre type de fonctionnement, par exemple une tête d'impression à aiguilles arrangées essentiellement suivant une ligne.It is understood that the embodiment described has no limiting character. In particular, the printing medium could be constituted by a flat carriage carrying out a linear movement back and forth. Changing devices could be provided for a different number of ink ribbon cassettes. The print head could be of a completely different type of operation, for example a print head with needles arranged essentially along a line.

Claims (9)

1. Imprimante pour l'impression simultanée d'une ligne entière comprenant un support d'impression sur lequel une feuille ou une bande de papier ou d'un autre matériau à imprimer est appliquée pendant l'impression, une tête d'impression sur laquelle une multitude d'organes d'impression sont disposés essentiellement suivant une ligne, un ruban encreur d'une largeur correspondant sensiblement à la largeur de la tête d'impression et un mécanisme de transport destiné à déplacer le papier suivant une direction perpendiculaire à ladite ligne, le ruban étant, en position d'impression, inséré entre le papier et les organes d'impression et déplacé suivant ladite direction perpendiculaire à la ligne, caractérisée en ce qu'elle comprend au moins un autre ruban encreur et un dispositif changeur destiné à échanger et à mettre en place l'un ou l'autre des rubans encreurs à ladite position d'impression.1. Printer for simultaneous printing of an entire line comprising a print medium on which a sheet or strip of paper or other material to be printed is applied during printing, a print head on which a multitude of printing members are arranged essentially along a line, an ink ribbon of a width corresponding substantially to the width of the print head and a transport mechanism intended to move the paper in a direction perpendicular to said line , the ribbon being, in the printing position, inserted between the paper and the printing members and moved in said direction perpendicular to the line, characterized in that it comprises at least one other ink ribbon and a changer device intended for exchange and place one or the other of the ink ribbons at said printing position. 2. Imprimante selon la revendication 1, caractérisée en ce que chacun des rubans encreurs est porté par un support de ruban et en ce que le dispositif changeur comprend un mécanisme convoyeur destiné à transporter les supports de ruban et à amener l'un des supports de ruban en position d'impression et un mécanisme de mise en place de la tête d'impression pour appliquer le ruban contre le support d'impression lors de l'impression et pour écarter la tête d'impression des supports de ruban lorsque ces derniers sont déplacés par le mécanisme convoyeur.2. Printer according to claim 1, characterized in that each of the ink ribbons is carried by a ribbon support and in that the changer device comprises a conveyor mechanism intended to transport the ribbon supports and to bring one of the ribbon in printing position and a printhead positioning mechanism for applying the ribbon against the print medium during printing and for moving the print head away from the ribbon supports when the latter are moved by the conveyor mechanism. 3. Imprimante selon la revendication 2, caractérisée en ce que chacun des supports de ruban est constitué par une cassette susceptible d'être fixée sur le mécanisme convoyeur.3. Printer according to claim 2, characterized in that each of the ribbon supports consists of a cassette capable of being fixed on the conveyor mechanism. 4. Imprimante selon la revendication 3, caractérisée en ce que le mécanisme convoyeur comprend au moins une courroie crantée fermée, montée sur des galets et entraînée par un moteur, cette courroie étant munie d'organes de fixation agencés de façon à maintenir les cassettes.4. Printer according to claim 3, characterized in that the conveyor mechanism comprises at least one closed toothed belt, mounted on rollers and driven by a motor, this belt being provided with fixing members arranged so as to hold the cassettes. 5. Imprimante selon la revendication 4, caractérisée en ce qu'elle comporte au moins deux courroies crantées reliées par des tiges pour assurer un déplacement parallèle des courroies.5. Printer according to claim 4, characterized in that it comprises at least two notched belts connected by rods to ensure a parallel movement of the belts. 6. Imprimante selon la revendication 4, caractérisée en ce que les courroies sont disposées sur des galets de guidage de façon à constituer un circuit de forme générale rectangulaire, chacun des côtés du rectangle portant un organe de fixation pour une cassette.6. Printer according to claim 4, characterized in that the belts are arranged on guide rollers so as to constitute a circuit of generally rectangular shape, each side of the rectangle carrying a fixing member for a cassette. 7. Imprimante selon la revendication 3, caractérisée en ce que le mécanisme de mise en place de la tête d'impression comprend un arbre de pivotement autour duquel la tête d'impression est pivotée pour être mise en place à l'intérieur de la cassette, pour appliquer le ruban contre le support d'impression et pour être dégagée de la cassette lorsque le mécanisme convoyeur est enclenché.7. Printer according to claim 3, characterized in that the mechanism for placing the print head comprises a pivot shaft around which the print head is pivoted to be placed inside the cassette , to apply the ribbon against the print medium and to be released from the cassette when the conveyor mechanism is engaged. 8. Imprimante selon la revendication 3, caractérisée en ce que le mécanisme convoyeur est constitué par un tambour sur lequel les cassettes à rubans encreurs peuvent être fixées.8. Printer according to claim 3, characterized in that the conveyor mechanism consists of a drum on which the ink ribbon cassettes can be fixed. 9. Imprimante selon la revendication 8, caractérisée en ce que le tambour est constitué par deux flasques reliés par des tiges, les deux flasques étant montés sur des galets de guidage et en ce que le centre des flasques comprend une ouverture pour permettre la commande du mécanisme de mise en place de la tête d'impression logée à l'intérieur du tambour.9. Printer according to claim 8, characterized in that the drum consists of two flanges connected by rods, the two flanges being mounted on guide rollers and in that the center of the flanges comprises an opening to allow control of the mechanism for placing the print head housed inside the drum.
EP85201736A 1984-11-22 1985-10-25 Multicolour printer Withdrawn EP0184234A1 (en)

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CH5586/84 1984-11-22
CH5586/84A CH661007A5 (en) 1984-11-22 1984-11-22 PRINTER FOR THE SIMULTANEOUS PRINTING OF AN ENTIRE LINE.

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Also Published As

Publication number Publication date
CH661007A5 (en) 1987-06-30
US4778290A (en) 1988-10-18
JPS61252187A (en) 1986-11-10

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