EP0237690B1 - Shiftable printhead - Google Patents

Shiftable printhead Download PDF

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Publication number
EP0237690B1
EP0237690B1 EP86810605A EP86810605A EP0237690B1 EP 0237690 B1 EP0237690 B1 EP 0237690B1 EP 86810605 A EP86810605 A EP 86810605A EP 86810605 A EP86810605 A EP 86810605A EP 0237690 B1 EP0237690 B1 EP 0237690B1
Authority
EP
European Patent Office
Prior art keywords
front support
head according
head
pins
respect
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP86810605A
Other languages
German (de)
French (fr)
Other versions
EP0237690A1 (en
Inventor
Stéphane Rossopoulos
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.)
Cessione precisa Sa
Original Assignee
Hermes Precisa International SA
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Publication date
Application filed by Hermes Precisa International SA filed Critical Hermes Precisa International SA
Publication of EP0237690A1 publication Critical patent/EP0237690A1/en
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Publication of EP0237690B1 publication Critical patent/EP0237690B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/485—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes
    • B41J2/505—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements
    • B41J2/5056—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements using dot arrays providing selective dot disposition modes, e.g. different dot densities for high speed and high-quality printing, array line selections for multi-pass printing, or dot shifts for character inclination
    • 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
    • B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
    • B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
    • B41J2/235—Print head assemblies
    • B41J2/265—Guides for print wires
    • 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
    • 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
    • B41J25/005—Mechanisms for bodily moving print heads or carriages parallel to the paper surface for serial printing movements superimposed to character- or line-spacing movements

Definitions

  • the subject of the present invention is a switchable writing head with needles comprising two rows of needles, these needles being slidably mounted in guide tracks in a front support in two parts, the rows being arranged substantially vertically with respect to the direction. writing a line by the head, a first device allowing at will to produce a relative displacement between the two parts of the front support in a first vertical direction relative to the writing direction to align the positions of the needles one row relative to the positions of the needles in the other row parallel to the writing direction, or to shift these positions between the two rows.
  • Such heads are known, which are described, for example, in European patents EP-A 0 078 342 and 0 139 190 or in patent US-A4 010 835. These needle heads make it possible by offset of the two rows of needles to obtain careful writing which does not, however, achieve the writing precision obtained by printing heads of a whole character, but of a slow printing speed.
  • the invention is characterized, for this purpose, in that the writing head comprises a second device arranged so as to move the two parts of the front support simultaneously in said first direction and a third device making it possible to move and adjust the front support in two parts in a second direction perpendicular to said first direction and the writing direction.
  • the offset of the two parts of the support simultaneously makes it possible to carry out a second writing pass thus filling the incomplete parts of the printing of the first pass to form continuous lines giving rise to high precision writing.
  • the latter is however only possible by very precise guiding of the terminal part of the needles, obtained by adjusting said front device with the front support.
  • Another advantage obtained is constituted by the fact that the writing head can easily be switched to a less precise, but neat writing or even to a conventional writing, suitable for high printing speeds.
  • the writing head has the advantage of a very precise construction while being simple to produce.
  • the writing head shown comprises a front part 3 and a rear part 1 carrying the control members for actuating the needles 2, these members not being shown, because they are well known to those skilled in the art.
  • the rear part 1 is mounted on a mobile carriage 4 sliding on two bars 5 arranged parallel to a striking cylinder 6.
  • the front part 3 comprises an assembly part 7 slidably mounted on a projecting part 8 integral with the part rear 1. This part 7 has two slots 9 in which are engaged screws 10 intended to block the front part 3 relative to the rear part 1 in predetermined positions.
  • the front part 3 has a front support 12 in two parts 13 and 14 carrying industrial rubies 15, 16, in which guide paths 17 are made for the needles 2 in the form of two vertical rows 18, 19.
  • the part 14 is slidably mounted in a vertical direction 46 on the part 13 allowing at will to produce a relative displacement between the two parts of the front support to align or offset the positions of the hands of a row relative to at the positions of the hands of the other row in the writing direction illustrated by the arrow 20.
  • the control device 21 for this relative movement of the two parts (fig. 1) consists of a rod 22 mounted on a pivot 23 of part 13 of the front support. The end 24 of this rod is engaged in a slot 25 of the part 14, the other end 26 cooperating with a lever 27.
  • notching means By not illustrated, and known in themselves (see for example the patent European No 0 075 342), it is possible to offset the needles 2 of a row 18 relative to the needles of the other row 19 by a distance corresponding to half the center distance between two needles of a row.
  • the rear extension 30 of the part 13 is connected to the assembly part 7 by four flexible connection blades 31 and 32 along the vertical with reference to FIG. 1.
  • An electromagnet 33 is mounted on the plate 7 and has a carcass 34 having an extension 35 forming a pivot for an actuating lever 36 constituted by the armature of the electromagnet.
  • a first end 37 of this lever is engaged in a recess 38 in the part 13 of the front support, while the other end 39 is capable of cooperating with a stop 40 when the electromagnet is triggered, as indicated in broken lines in Figure 1, thus constituting a device 41 for moving the two parts 13, 14 of the front support simultaneously.
  • the two parts of the front support 12 are displaced upwards, with reference to FIG. 1, by a distance corresponding to a quarter of the distance between the axes between two needles 2 of a row, the end 39 of the lever then resting on the carcass 34.
  • the pivot 35 occupies a position such that the end 37 of the lever 36 performs a displacement at least half as small as the other end 39 whose stroke is delimited by the adjustable stop 40 and the carcass 34. This reduction in the movement of the stroke of the end 39 relative to the movement of the end 37 and of the front support 12 ensures high precision in adjusting the movement of the front support 12.
  • the writing head allows conventional writing with little care, but at high speed (fig. 3a), careful writing by shifting the needles of the two rows at normal speed (fig. 3b) and a very precise execution writing by making two passages offset by a quarter of an axis at normal speed with the two rows 18, 19 of needles offset by a half axis.
  • the writing head is therefore suitable for a wide field of application.
  • the needles must be able to be held in guide paths as close as possible to their writing point.
  • the print head comprises, for this purpose, the third device 11 constituted by the assembly part 7 slidably mounted on the part 8 secured to the rear part 1 of the head.
  • This device allows precise adjustment of the front face of the rubies 15 and 16 relative to the point of the hands 2 by a displacement of the entire front part 3 of the head relative to the rear part 1. Also, by removing the screws 10 , the entire front part 3 of the writing head can be removed for the purposes of repair or to exchange it for a part 3 having another arrangement of the needles.
  • the third device 11 gives the advantage of being able to dismantle the rear part 1 carrying the control members for actuating the needles 2, without the needles leaving their guide paths 17, by moving back the front part 3, before repair work, for example, so that the point of the needles protrudes greatly from the rubies 15 and 16.
  • the variant illustrated in FIG. 4 is distinguished by the fact that the two rubies 15a and 16a are, moreover, capable of being displaced relative to each other in a direction parallel to the writing direction 20 by virtue of to a fourth device 49.
  • the part 14a of the front support 12a is, for this purpose, biased towards the part 13a by a leaf spring 50 bearing against a boss 51 of the part 14a and whose free ends are supported in housings 52 and 53.
  • Two parts 54, 55 in the form of a cam are inserted between the parts 13a and 14a.
  • the part 14a can be separated more or less from the part 13a making it possible to adapt the head d 'writing switchable to different types of writing by modifying the distance separating the two rows 18a, 19a of needles.

Description

La présente invention a pour objet une tête d'écriture commutable à aiguilles comprenant deux rangées d'aiguilles, ces aiguilles étant montées coulissantes dans des chemins de guidage dans un support frontal en deux parties, les rangées étant disposées sensiblement verticalement par rapport à la direction d'écriture d'une ligne par la tête, un premier dispositif permettant à volonté de produire un déplacment relatif entre les deux parties du support frontal suivant une première direction verticale par rapport à la direction d'écriture pour aligner les positions des aiguilles d'une rangée par rapport aux positions des aiguilles de l'autre rangée parallèlement à la direction d'écriture, ou de décaler ces positions entre les deux rangées.The subject of the present invention is a switchable writing head with needles comprising two rows of needles, these needles being slidably mounted in guide tracks in a front support in two parts, the rows being arranged substantially vertically with respect to the direction. writing a line by the head, a first device allowing at will to produce a relative displacement between the two parts of the front support in a first vertical direction relative to the writing direction to align the positions of the needles one row relative to the positions of the needles in the other row parallel to the writing direction, or to shift these positions between the two rows.

On connaît de telles têtes décrites, par exemple, dans les brevets européens EP-A 0 078 342 et 0 139 190 ou dans le brevet US-A4 010 835. Ces têtes à aiguilles permettent par décalage des deux rangées d'aiguilles d'obtenir une écriture soignée qui n'atteint cependant pas la précision d'écriture obtenue par des têtes à impression d'un caractère entier, mais d'une vitesse d'impression lente.Such heads are known, which are described, for example, in European patents EP-A 0 078 342 and 0 139 190 or in patent US-A4 010 835. These needle heads make it possible by offset of the two rows of needles to obtain careful writing which does not, however, achieve the writing precision obtained by printing heads of a whole character, but of a slow printing speed.

Il est le but de la présente invention de remédier à cet inconvénient des têtes à aiguilles et de créer une tête d'écriture à aiguilles pouvant produire une écriture de haute précision tout en étant commutable à des écritures moins précises, mais de grande vitesse.It is the object of the present invention to remedy this drawback of the needle heads and to create a needle writing head which can produce a writing of high precision while being switchable to less precise writing, but of high speed.

L'invention est caractérisée, à cet effet, en ce que la tête d'écriture comprend un second dispositif agencé de façon à déplacer les deux parties du support frontal simultanément suivant ladite première direction et un troisième dispositif permettant de déplacer et d'ajuster le support frontal en deux parties suivant une seconde direction perpendiculaire à ladite première direction et la direction d'écriture.The invention is characterized, for this purpose, in that the writing head comprises a second device arranged so as to move the two parts of the front support simultaneously in said first direction and a third device making it possible to move and adjust the front support in two parts in a second direction perpendicular to said first direction and the writing direction.

Le décalage des deux parties du support simultanément permet d'effectuer un deuxième passage d'écriture remplissant ainsi les parties incomplètes de l'impression du premier passage pour former des traits continus donnant naissance à une écriture de haute précision. Cette dernière n'est cependant possible que par un guidage très exact de la partie terminale des aiguilles, obtenue en ajustant par ledit troisième dispositif le support frontal. Un autre avantage obtenu est constitué par le fait que la tête d'écriture peut aisément être commutée à une écriture moins précise, mais soignée ou encore à une écriture conventionnelle, adpatée à des grandes vitesses d'impression. En outre, la tête d'écriture présente l'avantage d'une construction très précise tout en étant simple à réaliser.The offset of the two parts of the support simultaneously makes it possible to carry out a second writing pass thus filling the incomplete parts of the printing of the first pass to form continuous lines giving rise to high precision writing. The latter is however only possible by very precise guiding of the terminal part of the needles, obtained by adjusting said front device with the front support. Another advantage obtained is constituted by the fact that the writing head can easily be switched to a less precise, but neat writing or even to a conventional writing, suitable for high printing speeds. In addition, the writing head has the advantage of a very precise construction while being simple to produce.

Le dessin annexé représente schématiquement et à titre d'exemple une forme d'éxécution de l'invention.

  • La figure 1 est une coupe longitudinale à travers la tête d'écriture.
  • La figure 2 représente une vue frontale selon la flèche A de la figure 1.
  • La figure 3 illustre les différentes écritures obtenues par la tête d'écriture commutable.
  • La figure 4 représente une vue frontale d'une variante.
The accompanying drawing shows schematically and by way of example a form of embodiment of the invention.
  • Figure 1 is a longitudinal section through the writing head.
  • FIG. 2 represents a front view according to arrow A in FIG. 1.
  • FIG. 3 illustrates the various writes obtained by the switchable writing head.
  • Figure 4 shows a front view of a variant.

La tête d'écriture représentée comprend une partie antérieure 3 et une partie arrière 1 portant les organes de commande pour l'actionnement des aiguilles 2, ces organes n'étant pas représentés, car il sont bien connus par l'homme du métier. La partie arrière 1 est montée sur un chariot mobile 4 coulissant sur deux barres 5 agencées parallèlement à un cylindre de frappe 6. La partie antérieure 3 comprend une pièce d'assemblage 7 montée de façon coulissante sur une pièce en saillie 8 solidaire de la partie arrière 1. Cette pièce 7 présente deux fentes 9 dans lesquelles sont engagées des vis 10 destinées à bloquer la partie antérieure 3 par rapport à la partie arrière 1 dans des positions prédéterminées.The writing head shown comprises a front part 3 and a rear part 1 carrying the control members for actuating the needles 2, these members not being shown, because they are well known to those skilled in the art. The rear part 1 is mounted on a mobile carriage 4 sliding on two bars 5 arranged parallel to a striking cylinder 6. The front part 3 comprises an assembly part 7 slidably mounted on a projecting part 8 integral with the part rear 1. This part 7 has two slots 9 in which are engaged screws 10 intended to block the front part 3 relative to the rear part 1 in predetermined positions.

Tel que représenté à la figure 3, la partie antérieure 3 présente un support frontal 12 en deux parties 13 et 14 portant des rubis industriels 15, 16, dans lesquels des chemins de guidage 17 sont réalisés pour les aiguilles 2 sous forme de deux rangées verticales 18, 19. La partie 14 est montée de façon coulissante suivant une direction verticale 46 sur la partie 13 permettant à volonté de produire un déplacement relatif entre les deux parties du support frontal pour aligner ou décaler les positions des aiguilles d'une rangée par rapport aux positions des aiguilles de l'autre rangée selon la direction d'écriture illustrée par la flèche 20. Le dispositif de commande 21 de ce mouvement relatif des deux parties (fig. 1) est constitué par une tige 22 montée sur un pivot 23 de la partie 13 du support frontal. L'extrémité 24 de cette tige est engagée dans une fente 25 de la partie 14, l'autre extrémité 26 coopérant avec une manette 27. Par des moyens de crantage, non illustrés, et connus en eux-mêmes (voir par exemple le brevet européen No 0 075 342), il est possible de décaler les aiguilles 2 d'une rangée 18 par rapport aux aiguilles de l'autre rangée 19 d'une distance correspondant à la moitié de l'entr'axe entre deux aiguilles d'une rangée. Le prolongement arrière 30 de la partie 13 est relié à la pièce d'assemblage 7 par quatre lames de connexions 31 et 32 flexibles suivant la verticale en référence à la figure 1. Un électro-aimant 33 est monté sur la plaque 7 et présente une carcasse 34 ayant un prolongement 35 formant pivot pour un levier d'actionnement 36 constitué par l'armature de l'électro-aimant. Une première extrémité 37 de ce levier est engagée dans un évidement 38 de la partie 13 du support frontal, tandis que l'autre extrémité 39 est susceptible de coopérer avec une butée 40 lorsque l'électroaimant est déclenché, tel qu'indiqué en traits interrompus à la figure 1, constituant ainsi un dispositif 41 destiné à déplacer les deux parties 13, 14 du support frontal simultanément.As shown in Figure 3, the front part 3 has a front support 12 in two parts 13 and 14 carrying industrial rubies 15, 16, in which guide paths 17 are made for the needles 2 in the form of two vertical rows 18, 19. The part 14 is slidably mounted in a vertical direction 46 on the part 13 allowing at will to produce a relative displacement between the two parts of the front support to align or offset the positions of the hands of a row relative to at the positions of the hands of the other row in the writing direction illustrated by the arrow 20. The control device 21 for this relative movement of the two parts (fig. 1) consists of a rod 22 mounted on a pivot 23 of part 13 of the front support. The end 24 of this rod is engaged in a slot 25 of the part 14, the other end 26 cooperating with a lever 27. By notching means, not illustrated, and known in themselves (see for example the patent European No 0 075 342), it is possible to offset the needles 2 of a row 18 relative to the needles of the other row 19 by a distance corresponding to half the center distance between two needles of a row. The rear extension 30 of the part 13 is connected to the assembly part 7 by four flexible connection blades 31 and 32 along the vertical with reference to FIG. 1. An electromagnet 33 is mounted on the plate 7 and has a carcass 34 having an extension 35 forming a pivot for an actuating lever 36 constituted by the armature of the electromagnet. A first end 37 of this lever is engaged in a recess 38 in the part 13 of the front support, while the other end 39 is capable of cooperating with a stop 40 when the electromagnet is triggered, as indicated in broken lines in Figure 1, thus constituting a device 41 for moving the two parts 13, 14 of the front support simultaneously.

Deux ressorts 42 reliant des tiges 43 et 44 solidaires de la partie 13, respectivement de la pièce 7, sollicitent ces dernières l'une vers l'autre de façon que le levier 36 repose sur la butée 40, lorsque l'électro-aimant 33 est déclenché. Quand l'enroulement 45 de l'éclectro-aimant est mis sous tension, les deux parties du support frontal 12 sont déplacées vers le haut, en référence à la figure 1, d'une distance correspondant à un quart de l'entr'axe entre deux aiguilles 2 d'une rangée, l'extrémité 39 du levier reposant alors sur la carcasse 34. Le pivot 35 occupe une position telle, que l'extrémité 37 du levier 36 effectue un déplacement au moins deux fois plus petit que l'autre extrémité 39 dont la course est délimitée par la butée réglable 40 et la carcasse 34. Cette démultiplication du mouvement de la course de l'extrémité 39 par rapport au mouvement de l'extrémité 37 et du support frontal 12 assure une grande précision de réglage du déplacement du support frontal 12.Two springs 42 connecting rods 43 and 44 integral with part 13, respectively with part 7, urge the latter towards each other so that the lever 36 rests on the stop 40, when the electromagnet 33 is triggered. When the winding 45 of the electromagnet is energized, the two parts of the front support 12 are displaced upwards, with reference to FIG. 1, by a distance corresponding to a quarter of the distance between the axes between two needles 2 of a row, the end 39 of the lever then resting on the carcass 34. The pivot 35 occupies a position such that the end 37 of the lever 36 performs a displacement at least half as small as the other end 39 whose stroke is delimited by the adjustable stop 40 and the carcass 34. This reduction in the movement of the stroke of the end 39 relative to the movement of the end 37 and of the front support 12 ensures high precision in adjusting the movement of the front support 12.

Tel qu'illustré à la figure 3, la tête d'écriture permet l'écriture conventionnelle peu soignée, mais à haute vitesse (fig. 3a), une écriture soignée par décalage des aiguilles des deux rangées à vitesse normale (fig. 3b) et une écriture d'exécution très précise en effectuant deux passages décalés d'un quart d'entr'axe à vitesse normale avec les deux rangées 18, 19 d'aiguilles décalées d'un demi entr'axe. La tête d'écriture est donc adaptée à un domaine d'application étendu. Pour obtenir une écriture d'exécution parfaite, il est nécessaire que les aiguilles puissent être maintenues dans des chemins de guidage le plus près possible de leur pointe d'écriture. La tête d'impression comporte, à cet effet, le troisième dispositif 11 constitué par la pièce d'assemblage 7 montée de façon coulissante sur la pièce 8 solidaire de la partie arrière 1 de la tête. Ce dispositif permet un ajustage précis de la face frontale des rubis 15 et 16 par rapport à la pointe des aiguilles 2 par un déplacement de toute la partie antérieure 3 de la tête par rapport à la partie arrière 1. Aussi, en ôtant les vis 10, toute la partie antérieure 3 de la tête d'écriture peut être enlevée pour les besoins d'une réparation ou pour l'échanger contre une partie 3 présentant une autre disposition des aiguilles. En outre, le troisième dispositif 11 donne l'avantage de pouvoir démonter la partie arrière 1 portant les organes de commande pour l'actionnement des aiguilles 2, sans que les aiguilles sortent de leurs chemins de guidage 17, en reculant la partie antérieure 3, avant une intervention de réparation par exemple, de façon que la pointe des aiguilles dépasse largement des rubis 15 et 16.As illustrated in Figure 3, the writing head allows conventional writing with little care, but at high speed (fig. 3a), careful writing by shifting the needles of the two rows at normal speed (fig. 3b) and a very precise execution writing by making two passages offset by a quarter of an axis at normal speed with the two rows 18, 19 of needles offset by a half axis. The writing head is therefore suitable for a wide field of application. To obtain perfect execution writing, the needles must be able to be held in guide paths as close as possible to their writing point. The print head comprises, for this purpose, the third device 11 constituted by the assembly part 7 slidably mounted on the part 8 secured to the rear part 1 of the head. This device allows precise adjustment of the front face of the rubies 15 and 16 relative to the point of the hands 2 by a displacement of the entire front part 3 of the head relative to the rear part 1. Also, by removing the screws 10 , the entire front part 3 of the writing head can be removed for the purposes of repair or to exchange it for a part 3 having another arrangement of the needles. In addition, the third device 11 gives the advantage of being able to dismantle the rear part 1 carrying the control members for actuating the needles 2, without the needles leaving their guide paths 17, by moving back the front part 3, before repair work, for example, so that the point of the needles protrudes greatly from the rubies 15 and 16.

La variante illustrée à la figure 4 se distingue par le fait que les deux rubis 15a et 16a sont, en outre, susceptibles d'être déplacés l'un par rapport à l'autre suivant une direction parallèle à la direction d'écriture 20 grâce à un quatrième dispositif 49. La partie 14a du support frontal 12a est, à cet effet, sollicitée en direction de la partie 13a par un ressort à lame 50 prenant appui contre un bossage 51 de la partie 14a et dont les extrémités libres s'appuient dans des logements 52 et 53. Deux pièces 54, 55 en forme de came sont insérées entre les parties 13a et 14a. Par rotation de ces pièces 54, 55 autour des axes 56, 57 par un organe de commande non illustré, connu par l'homme du métier, la partie 14a peut être écartée plus ou moins de la partie 13a permettant d'adapter le tête d'écriture commutable à différents types d'écriture en modifiant la distance séparant les deux rangées 18a, 19a d'aiguilles.The variant illustrated in FIG. 4 is distinguished by the fact that the two rubies 15a and 16a are, moreover, capable of being displaced relative to each other in a direction parallel to the writing direction 20 by virtue of to a fourth device 49. The part 14a of the front support 12a is, for this purpose, biased towards the part 13a by a leaf spring 50 bearing against a boss 51 of the part 14a and whose free ends are supported in housings 52 and 53. Two parts 54, 55 in the form of a cam are inserted between the parts 13a and 14a. By rotation of these parts 54, 55 around the axes 56, 57 by a control member not shown, known to those skilled in the art, the part 14a can be separated more or less from the part 13a making it possible to adapt the head d 'writing switchable to different types of writing by modifying the distance separating the two rows 18a, 19a of needles.

Claims (10)

1. A shiftable print head of the pin type, having two ranges (18, 19) of pins (2), these pins being mounted slidably in guide channels (17) in a front support (12) having two portions (13, 14), the said ranges (18, 19) being disposed substantially vertically with respect to the direction (20) in which a line is printed by the head, a first control device (21) permitting a relative displacement to be produced at will between the two said portions (13, 14) of the front support (12) in a first direction (46) which is vertical with respect to the direction of printing, so as to align the position of the pins (2) of one said range (18) with respect to the positions of the pins (2) of the other range (19) parallel to the direction of printing (20), or to displace these positions between the two ranges (18, 19), characterised in that it includes a second device (41) adapted for displacing the two said portions (13, 14) of the front support (12) simultaneously in the said first direction (46), and a third device (11) allowing the split front support (12) to be displaced an adjusted in a second direction (47) perpendicular to the said first direction (46) and the direction of printing (20).
2. A head according to Claim 1 in which the axes of the pins (2) of one range are spaced apart by a predetermined distance, characterised in that the said relative displacement corresponds to one half of the predetermined distance, and the simultaneous displacement of the two portions (13, 14) of the front support poduced by the second said device (41) corresponds to one quarter of the said predetermined distance.
3. A head according to Claim 1, characterised in that the said front support (12) comprises a first portion (13) fixed with respect to one end of at least two connecting members (31, 32) which are flexible in the said first direction (46), the other end of the said connecting members being fixed to an assembly member (7) which is mounted, slidably in the said second direction (47), on the rear part (1) of the head which is fixed with respect to a carriage (4), the said second portion (14) of the front support (12) being mounted slidably on the first portion (13) of the said front support (12).
4. A head according to Claim 3, characterised in that the said second device (41) comprises a control member (33) mounted on the assembly member (7) and including an actuating lever (36) cooperating with the said first portion (13) of the front support (12).
5. A head according to Claim 4, characterised in that the control member comprises an electromagnet (33) acting on the actuating lever (36), the latter being disposed substantially parallel to the pins (2) and being mounted pivotally about a pivot (35) situated between the electromagnet (33) and the said first portion (13), the position of the pivot (35) being such that a first end (37) of the actuating lever (36), cooperating with the said first part (13), undergoes a displacement at least twice as small as the other end (39) of the said lever (36) when the electromagnet (33) is energised, the travel of the said second end (39) being limited by two abutments (34, 40).
6. A head according to Claim 5, characterised in that it comprises a resilient element (42) acting on the said first part (13) and so arranged as to bias the actuating lever (36) against one (40) of the stop abutments when the electromagnet (33) is de-energised.
7. A head according to Claim 3, characterised in that the said first device (21) includes a control bar (22) pivotally mounted on the said first portion (13) of the front support (12) and cooperating at one of its ends (24) with the said second portion (14) of the front support (12).
8. A head according to Claim 3, characterised in that the said third device (11) comprises at least one screw (10) which is slidable in a through opening (9) arranged parallel to the said second direction (47), the said screw (10) being such as to permit the assembly member (7) to be fixed with respect to the said rear part (1) of the head in predetermined positions.
9. A head according to Claim 3, characterised in that the assembly member (7) and the rear part (1) are conformed with each other in such a way as to allow one front support (12) to be exchanged for another front support.
10. A head according to Claim 1, characterised in that it includes a fourth device (49), so arranged as to allow relative displacement to be produced at will between the two potions (13, 14) of the front support (12) in a direction substantially parallel to the direction of printing (20)
EP86810605A 1986-03-21 1986-12-19 Shiftable printhead Expired EP0237690B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1157/86 1986-03-21
CH1157/86A CH667618A5 (en) 1986-03-21 1986-03-21 SWITCHABLE WRITING HEAD.

Publications (2)

Publication Number Publication Date
EP0237690A1 EP0237690A1 (en) 1987-09-23
EP0237690B1 true EP0237690B1 (en) 1989-10-11

Family

ID=4203810

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86810605A Expired EP0237690B1 (en) 1986-03-21 1986-12-19 Shiftable printhead

Country Status (5)

Country Link
US (1) US4854752A (en)
EP (1) EP0237690B1 (en)
JP (1) JPS62231763A (en)
CH (1) CH667618A5 (en)
DE (1) DE3666181D1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2586579B2 (en) * 1988-06-02 1997-03-05 ブラザー工業株式会社 Dot printing device
WO1991004865A1 (en) * 1989-09-29 1991-04-18 Siemens Aktiengesellschaft Graphic printer with several adjustable printing heads
DE4020010A1 (en) * 1990-06-21 1992-01-09 Mannesmann Ag MATRIX NEEDLE PRINT HEAD
IT1247770B (en) * 1990-10-31 1994-12-30 Microlys Spa DOT MATRIX PRINT HEAD FOR HIGH DEFINITION OR HIGH SPEED PRINTING

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2108006C3 (en) * 1971-02-19 1974-12-12 Walther-Bueromaschinen Gmbh, 7921 Gerstetten Mosaic wire print head
US4010835A (en) * 1975-08-01 1977-03-08 International Business Machines Corporation Matrix print head
IT1099489B (en) * 1978-09-11 1985-09-18 Honeywell Inf Systems PERFECTED MATRIX PRINTER HEAD
US4256408A (en) * 1979-07-30 1981-03-17 International Business Machines Corporation Dot matrix print head
US4459051A (en) * 1979-08-15 1984-07-10 Canon Kabushiki Kaisha Matrix printer
DE2947398A1 (en) * 1979-11-24 1981-05-27 Control Commerce AG, Ilanz, Graubünden Needle-type printing head - is in two mirror-image parts assembled together each with solenoids in semicircle
DE3022128C2 (en) * 1980-06-10 1983-12-08 Mannesmann AG, 4000 Düsseldorf Print head for generating print characters using the matrix printing process
JPS57201669A (en) * 1981-06-04 1982-12-10 Tokyo Electric Co Ltd Printing head for dot printer
CH644307A5 (en) * 1981-09-18 1984-07-31 Hermes Precisa International SWITCHABLE WRITING HEAD.
DE3333252C2 (en) * 1983-09-14 1986-02-13 Nixdorf Computer Ag, 4790 Paderborn Process for the production of a dot matrix print head
DE3412856A1 (en) * 1984-04-03 1985-10-03 Mannesmann AG, 4000 Düsseldorf MATRIX PRINT HEAD WITH ADJUSTABLE PRINT NEEDLE GUIDE

Also Published As

Publication number Publication date
US4854752A (en) 1989-08-08
DE3666181D1 (en) 1989-11-16
CH667618A5 (en) 1988-10-31
EP0237690A1 (en) 1987-09-23
JPS62231763A (en) 1987-10-12

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