EP1295727A1 - Accessible and lockable thermal printing device - Google Patents

Accessible and lockable thermal printing device Download PDF

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Publication number
EP1295727A1
EP1295727A1 EP02292082A EP02292082A EP1295727A1 EP 1295727 A1 EP1295727 A1 EP 1295727A1 EP 02292082 A EP02292082 A EP 02292082A EP 02292082 A EP02292082 A EP 02292082A EP 1295727 A1 EP1295727 A1 EP 1295727A1
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EP
European Patent Office
Prior art keywords
roller
hook
axis
line
chassis
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.)
Granted
Application number
EP02292082A
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German (de)
French (fr)
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EP1295727B1 (en
Inventor
Michel Louis
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.)
Axiohm SA
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Axiohm SA
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Publication of EP1295727A1 publication Critical patent/EP1295727A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00Devices 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
    • B41J11/20Platen adjustments for varying the strength of impression, for a varying number of papers, for wear or for alignment, or for print gap adjustment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/315Typewriters 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
    • B41J2/32Typewriters 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/02Framework

Definitions

  • printing devices are generally used thermal of sections of a paper tape including one face is sensitive to heat.
  • Each printed section forming a label or receipt is taken from a blank roll of paper which is usually housed in a compartment of the device. Access to this compartment for loading the roll is made through an opening closed by a movable wall which carries a part of the printer, most often the roller support (and training) paper under the head printing, so that the loading and in particular the placing the roll leader in the printer finds ease.
  • a print head in the form of a plate of ceramic with a line of heating points
  • a spring tending to create a return torque for the insert around its pivot axis in the direction of the backing roller (sometimes called capstan).
  • the remedy for this drawback is provided by present invention in that it ensures so simple and inexpensive better relative position between the capstan and the print head when of printing, and thus improve the quality of this along the line of heating points.
  • the invention therefore relates to a device thermal printing with a fixed frame with a print head provided with a line of dots heated and a chassis movable relative to the chassis fixed, carrying by the ends of an axis a roll of support of the paper tape between a first position in which the roller is in contact by one of its generators with the line of heating points of the head and a second position in which the roller and the head are distant from each other.
  • the print head is fixed on the chassis fixed and the device includes a holding mechanism applying the roller against the line of dots heated, in the first relative position of the chassis, including a hook for receiving each end of the roller axis, slidably mounted on the chassis fixed in a direction perpendicular to the line of heating points and subject to the effect of an elastic member callback directed to the print head.
  • each end of the axis of the roller is carried by the mobile chassis in a light substantially parallel to the direction of sliding of the hook when the movable chassis is in its first position aforesaid.
  • the print head comprises a ceramic plate associated with a metal radiator
  • the fixed frame is formed by the radiator arranged as a spacer between two angled supports comprising each a sliding guide for a hook, substantially perpendicular to the radiator.
  • This simple construction allows for a minimum number of identical parts to cover all a range of differentiating printing devices by the width of the paper ribbon to be printed.
  • FIG. 1 In Figure 1 are shown the main constituents of a thermal printer according to the invention. It is first of all a chassis 1 equipped with a print head 2 and a pair of hooks 3 and 4.
  • the chassis 1 is intended to be fixed to a general frame 5 which is the structure to which a geared motor group 6 and an element 7 belonging to a device for cutting printed sections of paper.
  • the printer also includes a frame 8 which rotates a support roller 9 and drive the paper to be printed.
  • This roller is integral with an axis not visible in the figure and equipped at one of its ends, in known manner, with a toothed wheel 9 a for its drive by the geared motor group 6.
  • these equipments are intended for be integrated into a more complete structure that defines in particular a housing for a sensitive paper roll thermally, an outer casing to constitute, either a portable device intended for transactions by integrated circuit card, a means of delivery a receipt, a statement, an associated label for example at a payment terminal, a distributor of bank notes or any transaction.
  • This structure generally comprises a wall of closing the access to the roller compartment of printing paper, wall which is movable relative to to the rest of the structure and which carries the chassis 8 henceforth called mobile chassis.
  • the rest of the structure integrates the frame 5 with the frame 1 which is therefore the frame fixed.
  • the arrow A in the drawing of Figure 1 represents the possible route of removal and reconciliation of two chassis, the wall carrying the chassis 8 being by example a hinged cover on the rest of the structure around an axis not shown parallel to the head 2.
  • the chassis 1 is constituted by the metal radiator 20 of the print head 2 on which is, in known manner, reported a plate of ceramic 21 fitted with a line of heating points 22 and electrical conductors and electronic components and by two brackets 10 and 11 fixed to this radiator 20 by appropriate means 12 and 13 (welding, screw).
  • Each bracket 10, 11 has a tab 10 a , 11 a for fixing it to the back of the radiator 20 and a cross member 10 b , 11 b perpendicular to the radiator and separated from the corresponding end of the latter by a space in which is housed the hook 3, 4 corresponding.
  • Each hook as shown in FIGS. 2 and 3, is formed by a cut plate 30, 40, of thickness substantially equal to the above-mentioned space and comprising, behind the radiator 20 and overhanging the latter, a housing 31, 41 Between the bottom of the housing and open on the side of the radiator, a spring 33, 43 is housed, the effect of which tends to recall each hook towards the rear of the radiator.
  • Each plate 30, 40 has a slot 34, 44 into which a finger 23, 24 secured to the radiator 20 at its end faces each cross member 10b , 11b .
  • the fingers and lights limit the sliding of the hooks.
  • Their guidance along the crossbars 10b , 11b of the brackets is produced by flanges 14, 15 forming slides.
  • each plate 30, 40 located at the front of the print head 2 is cut to shape hook with an opening 35, 45 defining one end free or spout 36, 46 (see figure 3 for the hook 4).
  • An outer surface 47 of the spout 46 and inclined relative to the sliding direction of the hook forms an input cam for a bearing 90 surrounding the end 91 of the capstan axis 9.
  • An interior surface 48 of the hook is also inclined relative to the direction sliding the hook but the other way around (it is of course the same for hook 3).
  • chassis 8 carries the capstan 9 by partitions 81 between which, to the right of the hooks 3 and 4, axis 91 with its bearings 90 is uncovered and can cooperate with hooks 3 and 4 to penetrate in the openings 35, 45.
  • the partitions 80 retain axis 91 in lights 81 whose dimension the longest is substantially perpendicular to the head 2 when the capstan 9 is in contact with the line of heating points.
  • each hook is recalled against the head 2 for each spring 33, 43 which has for effect on the one hand, to retain the bearing 90 at the bottom of opening 45 and thus oppose (at least up to one certain degree) to a movement of the capstan in the direction of the opening of the cover (opposite arrow A in figure 3) and on the other hand, to apply the capstan against the head 2 and more precisely against the line of points 22.
  • Each hook being independent, its action the corresponding end of axis 91 allows an application balanced capstan on the point line which can take into account and correct a fault the print head position.
  • the bearings 90 at the end of the shaft 91 opposite the hooks 3, 4 have the advantage of opposing practically no rolling resistance of capstan 2 on paper covering the head 2 when the cover is closed and during printer operation.
  • the effort to develop to separate the chassis 8 of the chassis 1 depends on the shape of the opening 45 at the level of beak 46. If this shape is shallow we can carry out this separation by lifting the cover, the hook return force can be overcome by the lifting effort. However in an opening deep notch, locking is positive and you have to operate hooks 3 and 4 to release axis 91.
  • a pusher can be provided for this purpose and in manual operation of the hooks to move them away from the print head, surfaces such as 48 of the Figure 3 push the bearings 90 beyond the spout 46 and help unlock the cover. The pusher will be provided to act on the two hooks at the same time without however constitute a connection of these hooks so to preserve their individual action on the capstan.
  • the axis 91 of the roller 9 is carried in chassis bearings 8.
  • the movable frame 8 is carried by a cover articulated to a structure that incorporates the fixed chassis 1, there is provision for play in this articulation whose axis is substantially parallel to the line of heating points.

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  • Electronic Switches (AREA)
  • Common Mechanisms (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Handling Of Sheets (AREA)

Abstract

Opening device for a thermal printer comprises a fixed chassis (1) with a thermal print head (2) on a mobile chassis (8) that moves with respect to the fixed chassis. The mobile chassis is fixed on the fixed chassis and has a mechanism for maintaining the roller (9) against the heating points.

Description

Dans le domaine de l'édition d'étiquettes ou de reçus, on utilise généralement des dispositifs d'impression thermique de tronçons d'un ruban de papier dont une face est sensible à la chaleur.In the field of label publishing or receipts, printing devices are generally used thermal of sections of a paper tape including one face is sensitive to heat.

Chaque tronçon imprimé formant étiquette ou reçu est tiré d'un rouleau de papier vierge qui est en général logé dans un compartiment de l'appareil. L'accès à ce compartiment pour le chargement du rouleau est réalisé au travers d'une ouverture fermée par une paroi mobile qui porte une partie de l'imprimante, le plus souvent le rouleau d'appui (et d'entraínement) du papier sous la tête d'impression, de sorte que le chargement et notamment le placement de l'amorce du rouleau dans l'imprimante s'en trouve facilité.Each printed section forming a label or receipt is taken from a blank roll of paper which is usually housed in a compartment of the device. Access to this compartment for loading the roll is made through an opening closed by a movable wall which carries a part of the printer, most often the roller support (and training) paper under the head printing, so that the loading and in particular the placing the roll leader in the printer finds ease.

Il existe plusieurs dispositifs qui mettent en oeuvre une imprimante ouvrante. Certains d'entre eux comportent une tête d'impression (sous forme d'une plaquette de céramique avec une ligne de points chauffants) montée de manière pivotante sur un châssis fixe et associée à un ressort tendant à créer un couple de rappel de la plaquette autour de son axe de pivotement en direction du rouleau d'appui (parfois dénommé cabestan). Ce couple de rappel assure d'une part l'effacement possible de la tête au passage à l'ouverture comme à la fermeture du couvercle qui le porte et d'autre part le verrouillage de ce couvercle dans son état fermé, la plaquette en appui sur le cabestan formant une retenue élastique de ce dernier, donc du couvercle auquel il est attaché.There are several devices that works an opening printer. Some of them include a print head (in the form of a plate of ceramic with a line of heating points) mounted pivotally on a fixed frame and associated with a spring tending to create a return torque for the insert around its pivot axis in the direction of the backing roller (sometimes called capstan). This couple of reminder ensures on the one hand the possible erasure of the head when opening and closing the lid who wears it and secondly locking it cover in its closed state, the plate resting on the capstan forming an elastic retainer for the latter, therefore the cover to which it is attached.

L'inconvénient principal de ces dispositifs réside dans le non parallélisme entre l'axe de pivotement de la tête et celui du cabestan, qui tient aux tolérances constructives, à l'usure... facteurs non maítrisables à des coûts raisonnables. Cette absence de parallélisme engendre un appui non uniforme de la tête d'impression (ligne de points) sur le papier qui se traduit par une qualité d'impression variable dans le sens de la largeur du ruban de papier sensible thermiquement.The main drawback of these devices is in the non-parallelism between the pivot axis of the head and that of the capstan, which sticks to tolerances constructive, wear and tear ... factors that cannot be controlled reasonable costs. This absence of parallelism generates non-uniform support of the print head (line of dots) on the paper which results in a quality variable printing across the width of the thermally sensitive paper tape.

Le remède à cet inconvénient est apporté par la présente invention en ce qu'elle permet d'assurer de manière simple et peu coûteuse une meilleure position relative entre le cabestan et la tête d'impression, au moment de l'impression, et ainsi d'améliorer la qualité de celle-ci tout au long de la ligne de points chauffants.The remedy for this drawback is provided by present invention in that it ensures so simple and inexpensive better relative position between the capstan and the print head when of printing, and thus improve the quality of this along the line of heating points.

A cet effet l'invention a donc pour objet un dispositif d'impression thermique comportant un châssis fixe avec une tête d'impression pourvue d'une ligne de points chauffants et un châssis mobile par rapport au châssis fixe, portant par les extrémités d'un axe un rouleau de soutien du ruban de papier entre une première position dans laquelle le rouleau est en contact par l'une de ses génératrices avec la ligne de points chauffants de la tête et une seconde position dans laquelle le rouleau et la tête sont éloignés l'un de l'autre. De manière caractéristique la tête d'impression est fixe sur le châssis fixe et le dispositif comporte un mécanisme de maintien de l'application du rouleau contre la ligne de points chauffants, dans la première position relative des châssis, comprenant un crochet de réception de chaque extrémité de l'axe du rouleau, monté coulissant sur le châssis fixe selon une direction perpendiculaire à la ligne de points chauffants et soumis à l'effet d'un organe élastique de rappel dirigé vers la tête d'impression.To this end the invention therefore relates to a device thermal printing with a fixed frame with a print head provided with a line of dots heated and a chassis movable relative to the chassis fixed, carrying by the ends of an axis a roll of support of the paper tape between a first position in which the roller is in contact by one of its generators with the line of heating points of the head and a second position in which the roller and the head are distant from each other. Characteristically the print head is fixed on the chassis fixed and the device includes a holding mechanism applying the roller against the line of dots heated, in the first relative position of the chassis, including a hook for receiving each end of the roller axis, slidably mounted on the chassis fixed in a direction perpendicular to the line of heating points and subject to the effect of an elastic member callback directed to the print head.

Dans l'invention, en prévoyant une tête d'impression absolument fixe dans le châssis fixe, on supprime toute incertitude de position de la tête par rapport à ce châssis fixe, incertitude qui existe par construction dans les têtes pivotantes de l'état de la technique du fait des tolérances de l'articulation à la fabrication (les châssis sont en général en matière plastique) et des jeux évoluant avec l'usure du matériel. En ayant ensuite prévu que le rouleau (cabestan) soit plaqué contre la ligne de points par des crochets indépendants l'un de l'autre à chacune des extrémités de son axe, on assure une application correcte et équilibrée de ce rouleau contre la ligne de points chauffants contrairement aux dispositifs connus dans lesquels la pression exercée par la tête sur le rouleau force le rouleau dans des paliers de maintien qui définissent l'orientation du rouleau indépendamment de l'orientation de la tête.In the invention, by providing a print head absolutely fixed in the fixed chassis, we remove any head position uncertainty with respect to this fixed frame, uncertainty that exists by construction in the pivoting heads of the state of the art of makes manufacturing joint tolerances (the chassis are generally made of plastic) and games evolving with the wear of the material. Then having provided that the roller (capstan) is pressed against the line of points by square brackets independent of each other at each end of its axis, a correct and balanced application of this roller against the line of heating points unlike the devices known in which the pressure exerted by the head on the roller forces the roller into holding bearings which define the orientation of the roller independently the orientation of the head.

Pour autoriser cette prise en charge sans contrainte du rouleau par les crochets, dans le cas où le rouleau est articulé au châssis mobile et dans le cas où ce châssis mobile est un couvercle articulé au châssis fixe autour d'un axe parallèle à la ligne de points chauffants, l'articulation du couvercle au châssis fixe est réalisée avec jeu ce qui permet aux crochets de compenser le faux parallélisme entre la ligne de points et l'articulation du couvercle.To authorize this support without constraint of the roller by the hooks, in case the roller is articulated to the movable frame and in case this movable chassis is a cover hinged to the chassis fixed around an axis parallel to the line of points heating, the articulation of the cover to the fixed frame is performed with play which allows the hooks to compensate the false parallelism between the line of points and the lid joint.

De manière préférée pour que le rouleau ait une liberté de position maximale par rapport au châssis mobile qui le porte, chaque extrémité de l'axe du rouleau est portée par le châssis mobile dans une lumière sensiblement parallèle à la direction du coulissement du crochet lorsque le châssis mobile est dans sa première position susdite.Preferably so that the roller has a maximum freedom of position relative to the mobile chassis who carries it, each end of the axis of the roller is carried by the mobile chassis in a light substantially parallel to the direction of sliding of the hook when the movable chassis is in its first position aforesaid.

Un mode de réalisation avantageux du dispositif de l'invention dans lequel la tête d'impression comporte une plaque de céramique associée à un radiateur métallique, le châssis fixe est formé par le radiateur disposé comme entretoise entre deux supports en équerre comportant chacune un guide de coulissement pour un crochet, sensiblement perpendiculaire au radiateur.An advantageous embodiment of the device of the invention in which the print head comprises a ceramic plate associated with a metal radiator, the fixed frame is formed by the radiator arranged as a spacer between two angled supports comprising each a sliding guide for a hook, substantially perpendicular to the radiator.

Cette construction simple permet de prévoir un nombre minimal de pièces, identiques, pour couvrir toute une gamme de dispositifs d'impression se différenciant par la largeur du ruban de papier à imprimer.This simple construction allows for a minimum number of identical parts to cover all a range of differentiating printing devices by the width of the paper ribbon to be printed.

D'autres caractéristiques et avantages de l'invention ressortiront de la description donnée ci-après d'un exemple de sa réalisation.Other characteristics and advantages of the invention will emerge from the description given below of an example of its realization.

Il sera fait référence aux dessins annexés parmi lesquels :

  • la figure 1 est une vue schématique éclatée des différents constituants d'un dispositif conforme à l'invention,
  • la figure 2 illustre le dispositif de l'invention par une coupe schématique horizontale du châssis fixe au niveau des crochets ;
  • la figure 3 est un schéma illustrant la coopération des châssis fixe et mobile au voisinage de leur première position relative.
Reference will be made to the appended drawings, in which:
  • FIG. 1 is an exploded schematic view of the various components of a device according to the invention,
  • Figure 2 illustrates the device of the invention by a horizontal schematic section of the fixed frame at the hooks;
  • FIG. 3 is a diagram illustrating the cooperation of the fixed and mobile chassis in the vicinity of their first relative position.

A la figure 1 sont représentés les principaux constituants d'une imprimante thermique selon l'invention. Il s'agit tout d'abord d'un châssis 1 équipé d'une tête d'impression 2 et d'une paire de crochets 3 et 4. Le châssis 1 est destiné à être fixé à un bâti général 5 qui est la structure à laquelle est également rapporté un groupe moto-réducteur 6 et un élément 7 appartenant à un dispositif de découpe des tronçons imprimés du papier.In Figure 1 are shown the main constituents of a thermal printer according to the invention. It is first of all a chassis 1 equipped with a print head 2 and a pair of hooks 3 and 4. The chassis 1 is intended to be fixed to a general frame 5 which is the structure to which a geared motor group 6 and an element 7 belonging to a device for cutting printed sections of paper.

L'imprimante comporte également un châssis 8 qui porte à rotation un rouleau 9 d'appui et d'entraínement du papier à imprimer. Ce rouleau est solidaire d'un axe non visible sur la figure et équipé à l'une de ses extrémités, de manière connue, d'une roue dentée 9a pour son entraínement par le groupe moto-réducteur 6.The printer also includes a frame 8 which rotates a support roller 9 and drive the paper to be printed. This roller is integral with an axis not visible in the figure and equipped at one of its ends, in known manner, with a toothed wheel 9 a for its drive by the geared motor group 6.

De manière connue ces équipements sont destinés à être intégrés dans une structure plus complète qui définit notamment un logement pour un rouleau de papier sensible thermiquement, un capotage extérieur pour constituer, soit un appareil portatif destiné aux transactions par carte à circuits intégrés, soit un moyen de délivrance d'un reçu, d'un relevé, d'une étiquette associée par exemple à une borne de paiement, un distributeur de billets de banque ou à toute transaction.In known manner, these equipments are intended for be integrated into a more complete structure that defines in particular a housing for a sensitive paper roll thermally, an outer casing to constitute, either a portable device intended for transactions by integrated circuit card, a means of delivery a receipt, a statement, an associated label for example at a payment terminal, a distributor of bank notes or any transaction.

Cette structure comporte en général une paroi de fermeture de l'accès au compartiment de logement du rouleau de papier à imprimer, paroi qui est mobile par rapport au reste de la structure et qui porte le châssis 8 nommé dès lors châssis mobile. Le reste de la structure intègre le bâti 5 avec le châssis 1 qui est donc le châssis fixe. La flèche A du dessin de la figure 1 représente le trajet possible d'éloignement et de rapprochement des deux châssis, la paroi portant le châssis 8 étant par exemple un couvercle articulé sur le reste de la structure autour d'un axe non représenté parallèle à la tête d'impression 2.This structure generally comprises a wall of closing the access to the roller compartment of printing paper, wall which is movable relative to to the rest of the structure and which carries the chassis 8 henceforth called mobile chassis. The rest of the structure integrates the frame 5 with the frame 1 which is therefore the frame fixed. The arrow A in the drawing of Figure 1 represents the possible route of removal and reconciliation of two chassis, the wall carrying the chassis 8 being by example a hinged cover on the rest of the structure around an axis not shown parallel to the head 2.

De manière plus détaillée et en référence également aux figures 2 et 3, le châssis 1 est constitué par le radiateur métallique 20 de la tête d'impression 2 sur lequel est, de manière connue, rapportée une plaquette de céramique 21 équipée d'une ligne de points chauffants 22 et des conducteurs électriques et composants électroniques de commande et par deux équerres 10 et 11 fixées à ce radiateur 20 par des moyens appropriés 12 et 13 (soudure, vis...).In more detail and also with reference in Figures 2 and 3, the chassis 1 is constituted by the metal radiator 20 of the print head 2 on which is, in known manner, reported a plate of ceramic 21 fitted with a line of heating points 22 and electrical conductors and electronic components and by two brackets 10 and 11 fixed to this radiator 20 by appropriate means 12 and 13 (welding, screw...).

Chaque équerre 10, 11 comporte une patte 10a, 11a pour sa fixation au dos du radiateur 20 et une traverse 10b, 11b perpendiculaire au radiateur et séparée de l'extrémité correspondante de ce dernier par un espace dans lequel est logé le crochet 3, 4 correspondant. Chaque crochet, comme représenté aux figures 2 et 3 est formé par une plaque 30, 40 découpée, d'épaisseur sensiblement égale à l'espace susdit et comportant, derrière le radiateur 20 et en surplomb de celui-ci, un logement 31, 41. Entre le fond du logement et ouvert du côté du radiateur, un ressort 33, 43 est logé dont l'effet tend à rappeler chaque crochet vers l'arrière du radiateur. Chaque plaque 30, 40 comporte une lumière 34, 44 dans laquelle pénètre un doigt 23, 24 solidaire du radiateur 20 à son extrémité en regard de chaque traverse 10b, 11 b. Les doigts et lumières limitent le coulissement des crochets. Leur guidage le long des traverses 10b, 11b des équerres est réalisé par des rebords 14, 15 formant glissières.Each bracket 10, 11 has a tab 10 a , 11 a for fixing it to the back of the radiator 20 and a cross member 10 b , 11 b perpendicular to the radiator and separated from the corresponding end of the latter by a space in which is housed the hook 3, 4 corresponding. Each hook, as shown in FIGS. 2 and 3, is formed by a cut plate 30, 40, of thickness substantially equal to the above-mentioned space and comprising, behind the radiator 20 and overhanging the latter, a housing 31, 41 Between the bottom of the housing and open on the side of the radiator, a spring 33, 43 is housed, the effect of which tends to recall each hook towards the rear of the radiator. Each plate 30, 40 has a slot 34, 44 into which a finger 23, 24 secured to the radiator 20 at its end faces each cross member 10b , 11b . The fingers and lights limit the sliding of the hooks. Their guidance along the crossbars 10b , 11b of the brackets is produced by flanges 14, 15 forming slides.

La partie de chaque plaque 30, 40 située à l'avant de la tête d'impression 2 est découpée en forme de crochet avec une ouverture 35, 45 définissant une extrémité libre ou bec 36, 46 (voir figure 3 pour le crochet 4). Une surface 47 extérieure du bec 46 et inclinée par rapport à la direction de coulissement du crochet forme une came d'entrée pour un palier 90 entourant l'extrémité 91 de l'axe du cabestan 9. Une surface intérieure 48 du crochet est également inclinée par rapport à la direction de coulissement du crochet mais dans l'autre sens (il en est bien entendu de même pour le crochet 3).The part of each plate 30, 40 located at the front of the print head 2 is cut to shape hook with an opening 35, 45 defining one end free or spout 36, 46 (see figure 3 for the hook 4). An outer surface 47 of the spout 46 and inclined relative to the sliding direction of the hook forms an input cam for a bearing 90 surrounding the end 91 of the capstan axis 9. An interior surface 48 of the hook is also inclined relative to the direction sliding the hook but the other way around (it is of course the same for hook 3).

On notera que le châssis 8 porte le cabestan 9 par des cloisons 81 entre lesquelles, au droit des crochets 3 et 4, l'axe 91 avec ses paliers 90 est découvert et peut coopérer avec les crochets 3 et 4 pour pénétrer dans les ouvertures 35, 45. En outre, les cloisons 80 retiennent l'axe 91 dans des lumières 81 dont la dimension la plus longue est sensiblement perpendiculaire à la tête d'impression 2 lorsque le cabestan 9 est au contact de la ligne de points chauffants.Note that the chassis 8 carries the capstan 9 by partitions 81 between which, to the right of the hooks 3 and 4, axis 91 with its bearings 90 is uncovered and can cooperate with hooks 3 and 4 to penetrate in the openings 35, 45. In addition, the partitions 80 retain axis 91 in lights 81 whose dimension the longest is substantially perpendicular to the head 2 when the capstan 9 is in contact with the line of heating points.

Lorsque le couvercle portant le châssis 8 est rabattu pour fermer le compartiment du rouleau de papier, à la fin du mouvement (flèche A figure 3), le cabestan 9 vient au contact de la tête d'impression et roule sur celle-ci. Dans la lumière 81, l'axe 91 ne peut plus se déplacer vers la gauche de la figure 3. Le palier 90 parvient donc au contact de la surface de came 47 (et 37 pour le crochet 3) inclinée et la poursuite de la fermeture entraíne un déplacement des crochets 3 et 4 vers la droite de la figure 3 (flèche B) permettant alors au palier 90 du cabestan de pénétrer dans l'ouverture 45. Le palier ayant passé le bec 46, chaque crochet est rappelé contre la tête 2 pour chaque ressort 33, 43 ce qui a pour effet d'une part, de retenir le palier 90 au fond de l'ouverture 45 et ainsi s'opposer (au moins jusqu'à un certain degré) à un mouvement du cabestan dans le sens de l'ouverture du couvercle (opposé à la flèche A figure 3) et d'autre part, à appliquer le cabestan contre la tête d'impression 2 et plus précisément contre la ligne de points 22. Chaque crochet étant indépendant, son action à l'extrémité correspondante de l'axe 91 permet une application équilibrée du cabestan sur la ligne de points chauffants qui peut prendre en compte et corriger un défaut de position de la tête d'impression. On notera que les paliers 90 en extrémité d'arbre 91 en regard des crochets 3, 4 ont pour intérêt de n'opposer pratiquement aucune résistance au roulement du cabestan 2 sur le papier recouvrant la tête 2 à la fermeture du couvercle et pendant le fonctionnement de l'imprimante.When the cover carrying the frame 8 is folded down to close the paper roll compartment, the end of the movement (arrow A figure 3), the capstan 9 comes into contact with the print head and rolls on it. In light 81, axis 91 can no longer be move to the left in Figure 3. The bearing 90 reaches therefore in contact with the cam surface 47 (and 37 for the hook 3) inclined and further closing causes the hooks 3 and 4 to move towards the right of Figure 3 (arrow B) then allowing the landing 90 of the capstan to enter opening 45. The bearing having passed the spout 46, each hook is recalled against the head 2 for each spring 33, 43 which has for effect on the one hand, to retain the bearing 90 at the bottom of opening 45 and thus oppose (at least up to one certain degree) to a movement of the capstan in the direction of the opening of the cover (opposite arrow A in figure 3) and on the other hand, to apply the capstan against the head 2 and more precisely against the line of points 22. Each hook being independent, its action the corresponding end of axis 91 allows an application balanced capstan on the point line which can take into account and correct a fault the print head position. Note that the bearings 90 at the end of the shaft 91 opposite the hooks 3, 4 have the advantage of opposing practically no rolling resistance of capstan 2 on paper covering the head 2 when the cover is closed and during printer operation.

L'effort à développer pour séparer le châssis 8 du châssis 1 dépend de la forme de l'ouverture 45 au niveau du bec 46. Si cette forme est peu profonde on peut procéder à cette séparation en soulevant le couvercle, la force de rappel des crochets pouvant être vaincue par l'effort de soulèvement. En revanche dans une ouverture en forme d'encoche profonde, le verrouillage est positif et il faut manoeuvrer les crochets 3 et 4 pour libérer l'axe 91. Un poussoir peut être prévu à cet effet et dans une manoeuvre manuelle des crochets pour les éloigner de la tête d'impression, les surfaces telles que 48 de la figure 3 repoussent les paliers 90 au-delà du bec 46 et favorisent le déverrouillage du couvercle. Le poussoir sera prévu pour agir sur les deux crochets à la fois sans pour autant constituer une liaison de ces crochets afin de préserver leur action individuelle sur le cabestan.The effort to develop to separate the chassis 8 of the chassis 1 depends on the shape of the opening 45 at the level of beak 46. If this shape is shallow we can carry out this separation by lifting the cover, the hook return force can be overcome by the lifting effort. However in an opening deep notch, locking is positive and you have to operate hooks 3 and 4 to release axis 91. A pusher can be provided for this purpose and in manual operation of the hooks to move them away from the print head, surfaces such as 48 of the Figure 3 push the bearings 90 beyond the spout 46 and help unlock the cover. The pusher will be provided to act on the two hooks at the same time without however constitute a connection of these hooks so to preserve their individual action on the capstan.

Dans une variante de réalisation non représentée de l'invention, l'axe 91 du rouleau 9 est porté dans des paliers du châssis 8. Pour néanmoins bénéficier de l'action correctrice des crochets sur l'orientation relative de l'axe 91 par rapport à la tête d'impression 2, et dans la mesure où le châssis mobile 8 est porté par un couvercle articulé à une structure qui intègre le châssis fixe 1, il est prévu du jeu dans cette articulation dont l'axe est sensiblement parallèle à la ligne de points chauffants.In an alternative embodiment not shown of the invention, the axis 91 of the roller 9 is carried in chassis bearings 8. To nonetheless benefit from the action correction of the brackets on the relative orientation axis 91 relative to the print head 2, and in since the movable frame 8 is carried by a cover articulated to a structure that incorporates the fixed chassis 1, there is provision for play in this articulation whose axis is substantially parallel to the line of heating points.

Claims (6)

Dispositif ouvrant d'impression thermique comportant un châssis fixe (1) avec une tête d'impression (2) pourvue d'une ligne de points (22) chauffants et un châssis mobile (8) par rapport au châssis fixe (1), portant par les extrémités d'un axe (90, 91) un rouleau (9) de soutien du ruban de papier entre une première position dans laquelle le rouleau (9) est en contact par l'une de ses génératrices avec la ligne de points chauffants (22) de la tête (2) et une seconde position dans laquelle le rouleau (9) et la tête (2) sont éloignés l'un de l'autre, caractérisé en ce que la tête d'impression (2) est fixe sur le châssis fixe (1) et en ce qu'il comporte un mécanisme de maintien de l'application du rouleau (9) contre la ligne de points chauffants (22), dans la première position relative des châssis, comprenant un crochet (3, 4) de réception de chaque extrémité de l'axe (90, 91) du rouleau (9), monté coulissant sur le châssis fixe (1) selon une direction perpendiculaire à la ligne de points chauffants (22) et soumis à l'effet d'un organe élastique (33, 43) de rappel dirigé vers la tête d'impression (2).Opening device for thermal printing comprising a fixed frame (1) with a print head (2) provided with a line of heating dots (22) and a frame movable (8) relative to the fixed frame (1), carrying by the ends of an axis (90, 91) a roll (9) for supporting the paper tape between a first position in which the roll (9) is in contact by one of its generatrices with the line of heating points (22) of the head (2) and a second position in which the roller (9) and the head (2) are spaced from each other, characterized in that the print head (2) is fixed on the fixed frame (1) and in that it comprises a mechanism for maintaining the application of the roller (9) against the line of heating points (22), in the first relative position of the frames, comprising a hook (3 , 4) for receiving each end of the axis (90, 91) of the roller (9), slidably mounted on the fixed frame (1) in a perpendicular direction area at the line of heating points (22) and subjected to the effect of an elastic return member (33, 43) directed towards the print head (2). Dispositif selon la revendication 1, caractérisé en ce que le châssis mobile (8) est articulé au châssis fixe (1) autour d'un axe sensiblement parallèle à la ligne de points chauffants (22) avec jeu.Device according to claim 1, characterized in that the mobile chassis (8) is articulated to the fixed chassis (1) about an axis substantially parallel to the line of heating points (22) with play. Dispositif selon l'une des revendications 1 ou 2, caractérisé en ce que chaque extrémité de l'axe (90, 91) du rouleau (9) est portée par le châssis mobile (8) dans une lumière (81) sensiblement parallèle à la direction du coulissement du crochet (3, 4) lorsque le châssis mobile (8) est dans sa première position susdite.Device according to one of claims 1 or 2, characterized in that each end of the axis (90, 91) of the roller (9) is carried by the movable frame (8) in a slot (81) substantially parallel to the direction of sliding of the hook (3, 4) when the movable frame (8) is in its above-mentioned first position. Dispositif selon l'une quelconque des revendications précédentes dans lequel la tête d'impression (2) comporte une plaque de céramique (21) associée à un radiateur (20) métallique, caractérisé en ce que le châssis fixe (1) est formé par le radiateur (20) disposé comme entretoise entre deux supports (10, 11) en équerre comportant chacune un guide (14, 15) de coulissement pour un crochet (3, 4), sensiblement perpendiculaire au radiateur (20).Device according to any one of the preceding claims, in which the print head (2) comprises a ceramic plate (21) associated with a metal radiator (20), characterized in that the fixed frame (1) is formed by the radiator (20) arranged as a spacer between two brackets (10, 11) at right angles, each comprising a sliding guide (14, 15) for a hook (3, 4), substantially perpendicular to the radiator (20). Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'extrémité libre (46) de chaque crochet porte extérieurement une surface de came (47) d'entrée de l'axe (90, 91) du rouleau (9) pour éloigner le crochet (3, 4) du radiateur (20) lors du passage de l'axe du rouleau dans le mouvement (A) du châssis (8) mobile de sa seconde vers sa première position.Device according to any one of the preceding claims, characterized in that the free end (46) of each hook externally carries a cam surface (47) for entering the axis (90, 91) of the roller (9) to move the hook (3, 4) away from the radiator (20) during the passage of the axis of the roller in the movement (A) of the movable frame (8) from its second to its first position. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que chaque crochet (3, 4) possède une surface de came intérieure (48) pour forcer le dégagement de l'axe (90, 91) du rouleau (9) hors du crochet lors d'un déplacement de ce dernier à l'encontre de l'effet de l'organe de rappel.Device according to any one of the preceding claims, characterized in that each hook (3, 4) has an internal cam surface (48) for forcing the release of the axis (90, 91) from the roller (9) out of the hook during movement of the latter against the effect of the return member.
EP02292082A 2001-09-21 2002-08-22 Accessible and lockable thermal printing device Expired - Lifetime EP1295727B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0112200 2001-09-21
FR0112200A FR2829964B1 (en) 2001-09-21 2001-09-21 OPENABLE AND LOCKABLE THERMAL PRINTING DEVICE

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EP1295727A1 true EP1295727A1 (en) 2003-03-26
EP1295727B1 EP1295727B1 (en) 2006-08-02

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EP02292082A Expired - Lifetime EP1295727B1 (en) 2001-09-21 2002-08-22 Accessible and lockable thermal printing device

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US (1) US6567113B2 (en)
EP (1) EP1295727B1 (en)
JP (1) JP2003136768A (en)
DE (1) DE60213533T2 (en)
FR (1) FR2829964B1 (en)

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Publication number Publication date
FR2829964A1 (en) 2003-03-28
DE60213533D1 (en) 2006-09-14
JP2003136768A (en) 2003-05-14
EP1295727B1 (en) 2006-08-02
FR2829964B1 (en) 2003-12-05
US20030058327A1 (en) 2003-03-27
DE60213533T2 (en) 2007-04-12
US6567113B2 (en) 2003-05-20

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