WO1998040642A1 - Maintaining and compressing spring and its application in a compact printing device - Google Patents

Maintaining and compressing spring and its application in a compact printing device Download PDF

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Publication number
WO1998040642A1
WO1998040642A1 PCT/FR1998/000486 FR9800486W WO9840642A1 WO 1998040642 A1 WO1998040642 A1 WO 1998040642A1 FR 9800486 W FR9800486 W FR 9800486W WO 9840642 A1 WO9840642 A1 WO 9840642A1
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WO
WIPO (PCT)
Prior art keywords
spring
roller
pressure
parts
housings
Prior art date
Application number
PCT/FR1998/000486
Other languages
French (fr)
Inventor
Denis Claude Jean Montagutelli
Original Assignee
A.P.S. Engineering S.A.R.L.
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 A.P.S. Engineering S.A.R.L. filed Critical A.P.S. Engineering S.A.R.L.
Priority to AU68415/98A priority Critical patent/AU6841598A/en
Publication of WO1998040642A1 publication Critical patent/WO1998040642A1/en

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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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B41J25/312—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print pressure adjustment mechanisms, e.g. pressure-on-the paper mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/025—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant characterised by having a particular shape

Definitions

  • the present invention relates to a spring which allows the maintenance of a part and its pressure and more particularly a print head of a printing device.
  • a device for mounting a thermal printing head comprising a frame and a roller which is rotatably mounted between the two side walls of the frame, and a head which is mounted facing the frame, between the side walls.
  • the device further comprises a pressure element assembled in rotation with the frame and adapted to bring the print head into contact with pressure on the roller and a pressure lever assembled in rotation with the frame. The pressure element is supported by the lever so as to compress the print head with the roller.
  • the device comprises a frame, a print head and a roller and a spring which presses the print head against the roller.
  • the devices described in these documents essentially relate to means for bringing the roller and the print head into contact by pressure.
  • These contact means are constituted by helical springs.
  • the main disadvantage of these springs that they are of a complex implementation, because the number of constituent parts is high.
  • Document US-A-4,872,096 describes a mechanism for holding a bulb in position in a lamp holder of a reflector.
  • the holding mechanism comprises a spring pivotally mounted on one side of the lamp holder and having notched edges adapted to be supported against the side of the bulb.
  • the spring is compressed and at its end which enters the pawl provided in a ramp. Part of the spring comes to rest on the side of the bulb, thus keeping it in place. Locking is done by bending the spring and not by twisting it.
  • FIG. 1 a device for driving a printing needle, in a transverse view.
  • This device comprises a spring which undergoes a tension when the winding is energized and which causes a lever to move which has an end which is attached to a printing needle.
  • the spring and the lever are not intended to hold a first part against a second part by twisting the spring or the lever.
  • the lever only deforms to allow movement of the needle for printing.
  • Document GB-A-1 407 024 also describes a lamp holding system, in particular for a vehicle, using a spring which by compression at its ends which fit into slots made in a sidewall and the middle parts of the spring hold the edge of a bulb by compression.
  • the document EP-A-0 718 110 describes a device for mounting a thermal print head comprising a frame and a roller which is rotatably mounted between the two side walls of the frame and a print head which is mounted facing the frame between the side walls.
  • the device further comprises a pressure element assembled in rotation with the frame.
  • the spring is a compression spring between two plates.
  • the document EP-A-0 306 687 describes a system for holding a lamp using a spring.
  • Document US-A-4,521,124 describes a printing wheel on the shaft of a printing machine with a spring of the spiral type in the form of a U-shaped hairpin and having arms deformable by resilience. Such a spring does not maintain the torsion but by bringing the two ends of the U closer so that they engage in the studs and by releasing the ends of the U, the spring then blocks the shaft of the printing machine entering the hole. The branches of the U press against the shaft of the printing machine to block it.
  • a thermal printing device comprising: a frame comprising two longitudinal sides and two transverse sides, a motor and gears, driving a roller, a head of thermal printing, a member for pressing the head on the roller, characterized in that it comprises a stiffening member resting, in a fixed position, on the two transverse sides of the chassis and on a longitudinal side of the chassis, and in free position which can pivot along an axis substantially parallel to a longitudinal side of the chassis.
  • the pressure member of the head on the roller is a spring.
  • the present application relates to a spring which allows the cleaning of the print head of a simplified implementation, without however authorize the deso da ⁇ sation of said spring from the body of the printer
  • the spring according to the invention is not only intended to be introduced into a printing device such as that described above, but it can be used to hold a first part on a second part, for example a plate on a roller , this holding being such that the plate is compressed on the roller
  • the spring according to the invention is characterized in that it consists of a wire of constant section coming to bear at one or more points of its main part, provided with two curved ends cooperating with two housings of a support, of so as to allow after its positioning on said support, a twist having the action of maintaining in pressure the point (s) of its main part with the stop (s) or in that the spring pivots inside the two housings according to a axis being substantially parallel to them, thus releasing the pressure to which the parts are subjected, and allowing a separation of said parts
  • the spring according to the invention is such that the second end has an extension forming a lever and gripping means
  • the spring is such that an additional element makes it possible to close off one of the positions for positioning the spring on its support, at the lever end, so as to trap it on said support.
  • the spring may be such that a tongue fitted on the part makes it possible to control the distance between the parts to be pressurized, as a function of the angle of rotation of the spring.
  • the spring according to the invention can be used to keep a print head in compression against a roller in a thermal printing device.
  • Figure 1 is a front view of the spring according to the invention.
  • Figure 2 is a side view of the spring according to the invention.
  • Figure 3 is a sectional view of the side of the first end of the spring of a compact printing device as described in the pending application filed the same day, the spring being released from its housings.
  • Figure 4 is a sectional side view of the second end of the spring of a compact printing device as described in the pending application filed the same day, the spring being released from its housings.
  • Figure 5 is a side view of the compact device, on the side of the second end of the spring, the latter being engaged in its housing.
  • Figure 6 is a schematic view of the spring released from its housings and parts to be kept in compression.
  • Figures 7 to 9 show another embodiment of a device shown in Figures 1 to 6.
  • Figure 7 shows a device in side view, the spring being in compression.
  • Figure 8 shows the device of Figure 7 in side view, the roller being separated from the head.
  • Figure 9 shows a top view of the device according to Figures 7 and 8.
  • the spring 1 is made up of a cylindrical wire of constant section. It comprises two ends 2, 3 and a main part 4 situated between ends 2 and 3.
  • the end 2 of the wire is in a plane parallel to the section of the wire, the other end 3 of the wire being in a plane parallel to the section of the wire, the wire being bent over its main part located between the two ends and ensuring by its arrow the pressure the pressure of a plate 5 on a roller 6.
  • the spring according to the invention is such that it is placed between two transverse sides 7 and 8 of a chassis, one longitudinal side of which supports a first part 5 to be kept in compression against a second part 6.
  • Each transverse side 7 and 8 has a housing 11 and 12. These housings are made opposite one from the other.
  • the first end 2 is introduced into a housing 11.
  • the second end 3 is introduced into the second housing 12.
  • the subsequent mounting of a part (here the switch 13 of the lever) makes it possible to prevent the spring from being detached from the chassis by obstruction of the spring insertion path in the housing 12.
  • the second end 3 has a U-shape 15 (see FIG. 1) which is a release lever which allows the spring to be put in place and withdrawn on the part 5 to maintain by simple rotation of the spring on itself.
  • To carry out the positioning of the spring after insertion of the ends 2 and 3 of the spring in the two housings 1 1 and 12, respectively, it must be rotated along an axis substantially parallel to that of the roller 6, until that the spring comes to block against a stop 14 made on the part 5 to be kept in compression.
  • the part 13 or switch obstructs the path of the housing 12. To release the part to be kept under pressure, it suffices to print and authorize a rotation of the spring, which makes it possible to release the part to be kept under pressure from the part to compress.
  • the spring according to the invention can be used to maintain a printing head 5 against compression against a roller 6 in a thermal printing device.
  • the print head 5 is movable in rotation about an axis substantially parallel to the axis of rotation of the roller 6.
  • FIGS. 7 to 9 another embodiment of the printing device shown in FIGS. 1 to 6 is shown.
  • the respective positions of the axes of rotation and of the tongue are such that when the rotation is maximum, the maximum position of separation between the two parts 21 and 20 to be separated is stable, because it is located shortly after a balancing zone unstable, corresponding to a maximum pressure of the spring against the tongue, during its rotation.
  • a return spring making it possible to return the spring to the pressurizing position, using a return spring integrated in the lever 16, in the case where it is desired that the pressureless position be fugitive.

Abstract

a) The invention concerns a spring for maintaining a first part and pressing it on a second part. b) The spring for compressing a first part (5), provided with at least a stop (14), against a second part, is characterised in that it consists of a wire with a constant cross section urged to exert pressure in one or several points of its main part (4), provided with two curved ends (2 and 3) co-operating with two housings (11 and 12) of a support, so as to produce, after it has been fixed on said support, a twist for maintaining the pressure of the points of its main part (4) with the stop(s) (14) or for pivoting inside the two housings (11 and 12) along an axis which is substantially parallel thereto, thereby releasing the pressure exerted on the two parts (5 and 6) resulting in the separation of said two parts. c) The invention is useful for maintaining a part and its pressure and more particularly a printing head in a printing device.

Description

RESSORT DE MAINTIEN EN COMPRESSION ET SON APPLICATION DANS UN DISPOSITIF D'IMPRESSION COMPACTCOMPRESSION HOLDING SPRING AND ITS APPLICATION IN A COMPACT PRINTING DEVICE
La présente invention concerne un ressort qui permet le maintien d'une pièce et sa pression et plus particulièrement une tête d'impression d'un dispositif d'impression.The present invention relates to a spring which allows the maintenance of a part and its pressure and more particularly a print head of a printing device.
On a décrit dans la Demande de Brevet Européen No. 0 718 110, un dispositif pour le montage d'une tête d'impression thermique comprenant un cadre et un rouleau qui est monté en rotation entre les deux parois latérales du cadre, et une tête d'impression qui est montée face au cadre, entre les parois latérales. Le dispositif comprend en outre un élément de pression assemblé en rotation avec le cadre et adapté pour amener la tête d'impression en contact avec pression sur le rouleau et un levier de pression assemblé en rotation avec le cadre. L'élément de pression est supporté par le levier de façon à compresser la tête d'impression avec le rouleau.There has been described in European Patent Application No. 0 718 110, a device for mounting a thermal printing head comprising a frame and a roller which is rotatably mounted between the two side walls of the frame, and a head which is mounted facing the frame, between the side walls. The device further comprises a pressure element assembled in rotation with the frame and adapted to bring the print head into contact with pressure on the roller and a pressure lever assembled in rotation with the frame. The pressure element is supported by the lever so as to compress the print head with the roller.
On a décrit dans la Demande de Brevet Européen No. 0 738 606 un dispositif pour uniformiser la pression d'une tête d 'impression le long d'un rouleau. Le dispositif comprend un cadre, une tête d'impression et un rouleau et un ressort qui presse la tête d'impression contre le rouleau.There has been described in European Patent Application No. 0 738 606 a device for uniformizing the pressure of a print head along a roller. The device comprises a frame, a print head and a roller and a spring which presses the print head against the roller.
On a décrit dans la Demande de Brevet Européen No. 0 659 574 un dispositif d'impression qui comprend une tête d'impression et un rouleau sur lequel elle est comprimée. Le dispositif est tel que le nombre de ses pièces est diminué. Ce dispositif comprend un levier qui permet de mettre en contact ou non la tête d'impression et le rouleau.There has been described in European Patent Application No. 0 659 574 a printing device which comprises a printing head and a roller on which it is compressed. The device is such that the number of its parts is reduced. This device comprises a lever which makes it possible to bring the print head and the roller into contact or not.
Les dispositifs décrits dans ces documents concernent essentiellement des moyens pour faire entrer en contact par pression le rouleau et la tête d'impression. Ces moyens de contact sont constitués par des ressorts hélicoïdaux. Ces ressorts ont pour inconvénient principal qu'ils sont d'une mise en œuvre complexe, car le nombre de pièces constitutives est élevé.The devices described in these documents essentially relate to means for bringing the roller and the print head into contact by pressure. These contact means are constituted by helical springs. The main disadvantage of these springs that they are of a complex implementation, because the number of constituent parts is high.
Le document US-A-4 872 096 décrit un mécanisme pour maintenir une ampoule en position dans un support de lampe d'un réflecteur. Le mécanisme de maintien comprend un ressort monté à pivotement sur un côté du support de lampe et ayant des bords crantés adaptés pour être supportés contre le flanc de l'ampoule. Le ressort est comprimé et a son extrémité qui pénètre dans le cliquet prévu dans une rampe. Une partie du ressort vient s'appuyer sur le flanc de l'ampoule en maintenant ainsi celle-ci en place. Le verrouillage se fait par flexion du ressort et non par torsion de celui-ci.Document US-A-4,872,096 describes a mechanism for holding a bulb in position in a lamp holder of a reflector. The holding mechanism comprises a spring pivotally mounted on one side of the lamp holder and having notched edges adapted to be supported against the side of the bulb. The spring is compressed and at its end which enters the pawl provided in a ramp. Part of the spring comes to rest on the side of the bulb, thus keeping it in place. Locking is done by bending the spring and not by twisting it.
Le document US-A-3 892 175 représente sur sa figure 1 un dispositif de conduite d'une aiguille d'impression, selon une vue transversale. Ce dispositif comporte un ressort qui subit une tension quand on met sous énergie l'enroulage et qui fait mouvoir un levier qui comporte une extrémité qui est rattachée à une aiguille d'impression. Le ressort et le levier ne sont pas destinés à maintenir une première pièce contre une seconde pièce par torsion du ressort ou du levier. Le levier se déforme uniquement pour permettre le déplacement de l'aiguille pour effectuer l'impression.The document US-A-3,892,175 shows in FIG. 1 a device for driving a printing needle, in a transverse view. This device comprises a spring which undergoes a tension when the winding is energized and which causes a lever to move which has an end which is attached to a printing needle. The spring and the lever are not intended to hold a first part against a second part by twisting the spring or the lever. The lever only deforms to allow movement of the needle for printing.
Le document GB-A-1 407 024 décrit lui aussi un système de maintien d'une lampe, notamment pour véhicule, à l'aide d'un ressort qui par compression a ses extrémités qui s'emboîtent dans des fentes réalisées dans un flanc et les parties médianes du ressort viennent maintenir le bord d'une ampoule par compression.Document GB-A-1 407 024 also describes a lamp holding system, in particular for a vehicle, using a spring which by compression at its ends which fit into slots made in a sidewall and the middle parts of the spring hold the edge of a bulb by compression.
Le document EP-A-0 718 110 décrit un dispositif pour le montage d'une tête d'impression thermique comprenant un cadre et un rouleau qui est monté en rotation entre les deux parois latérales du cadre et une tête d'impression qui est montée face au cadre entre les parois latérales. Le dispositif comprend en outre un élément de pression assemblé en rotation avec le cadre. Le ressort est un ressort à compression entre deux plaques.The document EP-A-0 718 110 describes a device for mounting a thermal print head comprising a frame and a roller which is rotatably mounted between the two side walls of the frame and a print head which is mounted facing the frame between the side walls. The device further comprises a pressure element assembled in rotation with the frame. The spring is a compression spring between two plates.
Le document EP-A-0 306 687 décrit un système de maintien d'une lampe à l'aide d'un ressort. Le document US-A-4 521 124 décrit une roue d'impression sur l'arbre d'une machine d'impression avec un ressort du type à spirale en forme d'épingle à cheveux en U et ayant des bras deformables par résilience. Un tel ressort n'effectue pas le maintien par torsion mais en rapprochant les deux extrémités du U pour qu'elles s'engagent dans les plots et en relâchant les extrémités du U, le ressort bloque alors l'arbre de la machine d'impression pénétrant dans le trou . Les branches du U viennent s'appuyer contre l'arbre de la machine d'impression pour le bloquer.The document EP-A-0 306 687 describes a system for holding a lamp using a spring. Document US-A-4,521,124 describes a printing wheel on the shaft of a printing machine with a spring of the spiral type in the form of a U-shaped hairpin and having arms deformable by resilience. Such a spring does not maintain the torsion but by bringing the two ends of the U closer so that they engage in the studs and by releasing the ends of the U, the spring then blocks the shaft of the printing machine entering the hole. The branches of the U press against the shaft of the printing machine to block it.
Le document US-A-5 226 634 décrit un ressort résilient comportant une forme sensiblement en U muni de pattes dans les branches du U et de pattes dans le fond du U. Ce type de ressort n'est pas sous forme d'un fil (à savoir n'est pas filaire) mais d'une seule pièce poinçonnée.Document US-A-5 226 634 describes a resilient spring comprising a substantially U-shaped shape provided with lugs in the branches of the U and lugs in the bottom of the U. This type of spring is not in the form of a wire (ie is not wired) but in one punched piece.
On a décrit dans la demande de brevet français déposée le même jour par le Demandeur, un dispositif d'impression thermique comprenant: un châssis comportant deux côtés longitudinaux et deux côtés transversaux, un moteur et des engrenages, entraînant un rouleau, une tête d'impression thermique, un organe de pression de la tête sur le rouleau, caractérisé en ce qu'il comporte un organe de rigidification s'appuyant, en position fixe, sur les deux côtés transversaux du châssis et sur un côté longitudinal du châssis, et en position libre pouvant pivoter selon un axe sensiblement parallèle à un côté longitidinal du châssis. L'organe de pression de la tête sur le rouleau est un ressort.There has been described in the French patent application filed the same day by the Applicant, a thermal printing device comprising: a frame comprising two longitudinal sides and two transverse sides, a motor and gears, driving a roller, a head of thermal printing, a member for pressing the head on the roller, characterized in that it comprises a stiffening member resting, in a fixed position, on the two transverse sides of the chassis and on a longitudinal side of the chassis, and in free position which can pivot along an axis substantially parallel to a longitudinal side of the chassis. The pressure member of the head on the roller is a spring.
La présente demande a pour objet un ressort qui permette le nettoyage de la tête d'impression d'une mise en œuvre simplifiée, sans pour autant autoriser la déso daπsation dudit ressort du corps de l'imprimanteThe present application relates to a spring which allows the cleaning of the print head of a simplified implementation, without however authorize the deso daπsation of said spring from the body of the printer
Le ressort selon l'invention n'est pas uniquement destiné à être introduit dans un dispositif d'impression tel que celui décrit plus haut, mais il peut être utilisé pour maintenir une première pièce sur une seconde pièce, par exemple une plaque sur un rouleau, ce maintien étant tel que la plaque est comprimée sur le rouleauThe spring according to the invention is not only intended to be introduced into a printing device such as that described above, but it can be used to hold a first part on a second part, for example a plate on a roller , this holding being such that the plate is compressed on the roller
Le ressort selon l'invention est caractérisé en ce qu'il est constitué d'un fil de section constante venant en appui en un ou plusieurs points de sa partie principale, muni de deux extrémités recourbées coopérant avec deux logements d'un support, de manière à permettre après sa mise en place sur ledit support, un vrillage ayant pour action de maintenir en pression le ou les points de sa partie principale avec la ou les butées ou en ce que le ressort pivote à l'intérieur des deux logements selon un axe leur étant sensiblement parallèle, libérant ainsi la pression dont les pièces font l'objet, et permettant une séparation des dites piècesThe spring according to the invention is characterized in that it consists of a wire of constant section coming to bear at one or more points of its main part, provided with two curved ends cooperating with two housings of a support, of so as to allow after its positioning on said support, a twist having the action of maintaining in pressure the point (s) of its main part with the stop (s) or in that the spring pivots inside the two housings according to a axis being substantially parallel to them, thus releasing the pressure to which the parts are subjected, and allowing a separation of said parts
Le ressort selon l'invention est tel que la deuxième extrémité comporte un prolongement formant levier et moyen de préhensionThe spring according to the invention is such that the second end has an extension forming a lever and gripping means
En outre le ressort est tel qu'un élément additionnel, permet d'obturer l'un des logements de positionnement du ressort sur son support , à l'extrémité formant levier , de manière à l'emprisonner sur ledit supportIn addition, the spring is such that an additional element makes it possible to close off one of the positions for positioning the spring on its support, at the lever end, so as to trap it on said support.
Le ressort peut être tel qu'une languette aménagée sur la pièce permet de commander la distance d'éloignement des pièces à mettre en pression, en fonction de l'angle de rotation du ressortThe spring may be such that a tongue fitted on the part makes it possible to control the distance between the parts to be pressurized, as a function of the angle of rotation of the spring.
Il est tel qu'il pivote à l'intérieur des deux logements selon un axe leur étant sensiblement parallèle, libérant ainsi la pression dont les deux pièces font l'objet, et permettant une séparation de cesdites pièces Les positions relatives des axes de rotation du ressort et de la pièce sont telles que la position correspondant à l'éloignement maximal des pièces est stable.It is such that it pivots inside the two housings along an axis being substantially parallel to them, thus releasing the pressure of which the two parts are subjected, and allowing a separation of these said parts. The relative positions of the axes of rotation of the spring and the part are such that the position corresponding to the maximum distance between the parts is stable.
Le ressort selon l'invention peut être utilisé pour maintenir en compression une tête d'impression contre un rouleau dans un dispositif d'impression thermique.The spring according to the invention can be used to keep a print head in compression against a roller in a thermal printing device.
La desciption suivante, en regard des dessins annexés à titre non limitatif, permettra de comprendre comment l'invention peut être mise en pratique. La Figure 1 est une vue de face du ressort selon l'invention.The following description, with reference to the drawings which are non-limiting, will explain how the invention can be put into practice. Figure 1 is a front view of the spring according to the invention.
La Figure 2 est une vue de côté du ressort selon l'invention. La Figure 3 est une vue en coupe du côté de la première extrémité du ressort d'un dispositif compact d'impression tel que décrite dans la demande en instance déposée le même jour, le ressort étant dégagé de ses logements.Figure 2 is a side view of the spring according to the invention. Figure 3 is a sectional view of the side of the first end of the spring of a compact printing device as described in the pending application filed the same day, the spring being released from its housings.
La Figure 4 est une vue en coupe du côté de la seconde extrémité du ressort d'un dispositif compact d'impression tel que décrite dans la demande en instance déposée le même jour, le ressort étant dégagé de ses logements. La Figure 5 est une vue de côté du dispositif compact, du côté de la seconde extrémité du ressort, celle-ci étant engagée dans son logement.Figure 4 is a sectional side view of the second end of the spring of a compact printing device as described in the pending application filed the same day, the spring being released from its housings. Figure 5 is a side view of the compact device, on the side of the second end of the spring, the latter being engaged in its housing.
La Figure 6 est une vue schématique du ressort dégagé de ses logements et des pièces à maintenir en compression. Les Figures 7 à 9 représentent un autre mode de réalisation d'un dispositif représenté sur les Figures 1 à 6.Figure 6 is a schematic view of the spring released from its housings and parts to be kept in compression. Figures 7 to 9 show another embodiment of a device shown in Figures 1 to 6.
La Figure 7 représente un dispositif en vue de côté, le ressort étant en compression.Figure 7 shows a device in side view, the spring being in compression.
La Figure 8 représente le dispositif de la Figure 7 en vue de côté, le rouleau étant séparé de la tête . La Figure 9 représente une vue de dessus du dispositif selon les Figures 7 et 8.Figure 8 shows the device of Figure 7 in side view, the roller being separated from the head. Figure 9 shows a top view of the device according to Figures 7 and 8.
Le ressort 1 est contitué d'un fil cylindrique de section constante. Il comprend deux extrémités 2, 3 et une partie principale 4 située entre les extrémités 2 et 3. L' extrémité 2 du fil est dans un plan parallèle à la section du fil, l'autre extrémité 3 du fil étant dans un plan parallèle à la section du fil, le fil étant courbé sur sa partie principale située entre les deux extrémités et assurant par sa flèche la pression la pression d'une plaque 5 sur un rouleau 6. Le ressort selon l'invention est tel qu'il est placé entre deux côtés transversaux 7 et 8 d'un châssis, dont un côté longidutinal supporte une première pièce 5 à maintenir en compression contre une seconde pièce 6. Chaque côté transversal 7 et 8 comporte un logement 11 et 12. Ces logements sont réalisés en regard l'une de l'autre. On introduit la première extrémité 2 dans un logement 11. On introduit la deuxième extrémité 3 dans le second logement 12. Le montage ultérieur d'une pièce (ici l'interrupteur 13 du levier) permet d'empêcher la désolidarisation du ressort du châssis par obstruction du chemin d'insertion du ressort dans le logement 12. La deuxième extrémité 3 a une forme en U 15 (voir Figure 1 ) qui est un levier de dégagement qui permet la mise en place du ressort et son retrait sur la pièce 5 à maintenir par simple rotation du ressort sur lui-même. Pour effectuer la mise en place du ressort, après insertion des extrémités 2 et 3 du ressort dans les deux logements 1 1 et 12, respectivement, il faut lui imprimer une rotation selon un axe sensiblement parallèle à celui du rouleau 6, jusqu'à ce que le ressort vienne se bloquer contre une butée 14 réalisée sur la pièce 5 à maintenir en compression. La pièce 13 ou switch vient obstruer le chemin du logement 12. Pour dégager la pièce à maintenir en pression, il suffit d'imprimer et d'autoriser une rotation du ressort, ce qui permet de dégager la pièce à maintenir en pression de la pièce à comprimer. Le ressort selon l'invention peut être utilisé pour maintenir en compression une tête d'impression 5 contre un rouleau 6 dans un dispositif d'impression thermique. La tête d'impression 5 est mobile en rotation autour d'un axe sensiblement parallèle à l'axe de rotation du rouleau 6.The spring 1 is made up of a cylindrical wire of constant section. It comprises two ends 2, 3 and a main part 4 situated between ends 2 and 3. The end 2 of the wire is in a plane parallel to the section of the wire, the other end 3 of the wire being in a plane parallel to the section of the wire, the wire being bent over its main part located between the two ends and ensuring by its arrow the pressure the pressure of a plate 5 on a roller 6. The spring according to the invention is such that it is placed between two transverse sides 7 and 8 of a chassis, one longitudinal side of which supports a first part 5 to be kept in compression against a second part 6. Each transverse side 7 and 8 has a housing 11 and 12. These housings are made opposite one from the other. The first end 2 is introduced into a housing 11. The second end 3 is introduced into the second housing 12. The subsequent mounting of a part (here the switch 13 of the lever) makes it possible to prevent the spring from being detached from the chassis by obstruction of the spring insertion path in the housing 12. The second end 3 has a U-shape 15 (see FIG. 1) which is a release lever which allows the spring to be put in place and withdrawn on the part 5 to maintain by simple rotation of the spring on itself. To carry out the positioning of the spring, after insertion of the ends 2 and 3 of the spring in the two housings 1 1 and 12, respectively, it must be rotated along an axis substantially parallel to that of the roller 6, until that the spring comes to block against a stop 14 made on the part 5 to be kept in compression. The part 13 or switch obstructs the path of the housing 12. To release the part to be kept under pressure, it suffices to print and authorize a rotation of the spring, which makes it possible to release the part to be kept under pressure from the part to compress. The spring according to the invention can be used to maintain a printing head 5 against compression against a roller 6 in a thermal printing device. The print head 5 is movable in rotation about an axis substantially parallel to the axis of rotation of the roller 6.
Sur les Figures 7 à 9 on a représenté un autre mode de réalisation du dispositif d'impression représenté sur les Figures 1 à 6In FIGS. 7 to 9 another embodiment of the printing device shown in FIGS. 1 to 6 is shown.
Le principe de rotation du ressort 18 est conservé mais sa rotation et sa fixation sont assurées par une seule et même pièce, le levier 16. Lors de l'assemblage du mécanisme, l'interpénétration du ressort 18 dans le levier 16 est réalisée après passage de la partie extérieure du ressort 18 dans le trou 17 du levier 16 et passage en force par dessus le plot 19. L'ensemble ressort 18, levier 16 et corps du mécanisme 22 est alors indémontable. La rotation du levier 16 est réalisée autour du rouleau d'impressionThe principle of rotation of the spring 18 is preserved but its rotation and its fixing are ensured by a single piece, the lever 16. During the assembly of the mechanism, the interpenetration of the spring 18 in the lever 16 is carried out after passage of the outer part of the spring 18 in the hole 17 of the lever 16 and force passage over the stud 19. The spring 18, lever 16 and body of the mechanism 22 assembly is then non-removable. The lever 16 is rotated around the printing roller
20, formant ainsi la fonction de palier pour ledit rouleau.20, thus forming the bearing function for said roller.
On voit alors que la pression du levier par un opérateur permet d'effectuer une rotation du levier 16 et donc du ressort 18, libérant ainsi la pression qu'il exerce entre les deux pièces 20 et 21 . Sur la première pièce 21 à maintenir en pression (ici le support de la tête d'impression) on a aménagé en plus de la butée 23, une languette 24 destinée à éloigner lors de la rotation du ressort 18, la première pièce 21 de la seconde (ici le rouleau) 20.It can then be seen that the pressure of the lever by an operator makes it possible to rotate the lever 16 and therefore the spring 18, thereby releasing the pressure that it exerts between the two parts 20 and 21. On the first part 21 to be kept under pressure (here the support of the print head), in addition to the stop 23, a tongue 24 intended to move the first part 21 of the second (here the roller) 20.
Enfin les positions respectives des axes de rotation et de la languette sont telles que lorsque la rotation est maximale, la position maximale d'éloignement entre les deux pièces 21 et 20 à séparer est stable, car elle se situe peu après une zone d'équilbre instable, correspondant à un maximum de pression du ressort contre la languette, lors de sa rotation. On pourra enfin installer un ressort de rappel permettant de ramener le ressort à la position de mise en pression, à l'aide d'un ressort de rappel intégré 25 dans le levier 16, dans le cas où on souhaite que la position sans pression soit fugitive.Finally, the respective positions of the axes of rotation and of the tongue are such that when the rotation is maximum, the maximum position of separation between the two parts 21 and 20 to be separated is stable, because it is located shortly after a balancing zone unstable, corresponding to a maximum pressure of the spring against the tongue, during its rotation. Finally, it is possible to install a return spring making it possible to return the spring to the pressurizing position, using a return spring integrated in the lever 16, in the case where it is desired that the pressureless position be fugitive.
Il s'agit d'un système particulièrement peu coûteux en pièces, en temps d'assemblage, et très fiable. Il permet de libérer deux éléments en pression sans désolidariser une seule pièce du châssis d'impression. Il permet en outre de nettoyer une tête d'impression quand le ressort est dégagé. It is a particularly inexpensive system in parts, in assembly time, and very reliable. It frees two elements under pressure without detaching a single part from the printing frame. It also makes it possible to clean a print head when the spring is released.

Claims

REVENDICATIONS
1. Ressort de maintien en compression d'une première pièce (5), munie d'au moins une butée (14), contre une seconde pièce (6), caractérisé en ce qu'il est constitué d'un fil de section constante venant en appui en un ou plusieurs points de sa partie principale (4), muni de deux extrémités (2, 3) recourbées coopérant avec deux logements (11 , 12) d'un support, de manière à permettre après sa mise en place sur ledit support, un vrillage ayant pour action de maintenir en pression le ou les points de sa partie principale (4) avec la ou les butées (14) ou en ce que le ressort pivote à l'intérieur des deux logements (11 ) et (12) selon un axe leur étant sensiblement parallèle, libérant ainsi la pression dont les deux pièces (5) et (6) font l'objet et permettant une séparation de ces dites pièces.1. Spring for maintaining compression of a first part (5), provided with at least one stop (14), against a second part (6), characterized in that it consists of a wire of constant section coming to bear at one or more points of its main part (4), provided with two curved ends (2, 3) cooperating with two housings (11, 12) of a support, so as to allow, after its installation on said support, a twist having the action of keeping the point or points of its main part (4) in pressure with the stop (s) (14) or in that the spring pivots inside the two housings (11) and ( 12) along an axis being substantially parallel to them, thus releasing the pressure of which the two parts (5) and (6) are the subject and allowing a separation of these said parts.
2. Ressort selon la revendication 1 , caractérisé en ce que la deuxième extrémité (3) comporte un prolongement (15) formant levier et moyen de préhension.2. Spring according to claim 1, characterized in that the second end (3) has an extension (15) forming a lever and gripping means.
3. Ressort selon l'une quelconque des revendications 1 à 2, caractérisé en ce qu'un élément additionnel (13), permet d'obturer, l'un des logements (12) de positionnement du ressort sur son support, à l'extrémité formant levier , de manière à l'emprisonner sur ledit support.3. Spring according to any one of claims 1 to 2, characterized in that an additional element (13) makes it possible to close off, one of the housings (12) for positioning the spring on its support, at the end forming a lever, so as to trap it on said support.
4. Ressort selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'une languette (24), aménagée sur la pièce (5) permet de commander la distance d'éloignement des pièces (5) et (6) à mettre en pression, en fonction de l'angle de rotation du ressort.4. Spring according to any one of claims 1 to 3, characterized in that a tongue (24), fitted on the part (5) makes it possible to control the distance from which the parts (5) and (6) move away. pressurize, depending on the angle of rotation of the spring.
5. Ressort selon l'une quelconque des revendicatins 1 à 4, caractérisé en ce que les positions relatives des axes de rotation du ressort et de la pièce (5) sont telles que la position correspondant à l'éloignement maximal des pièces (5) et (6) est stable.5. Spring according to any one of claims 1 to 4, characterized in that the relative positions of the axes of rotation of the spring and the part (5) are such that the position corresponding to the maximum distance of the parts (5) and (6) is stable.
6. Ressort selon l'une des revendications précédentes, caractérisé en ce qu il est utilisé pour maintenir en compression une tête d'impression contre un rouleau dans un dispositif d'impression thermique.6. Spring according to one of the preceding claims, characterized in that it is used to maintain in compression a print head against a roller in a thermal printing device.
7. Dispositif d'impression thermique comprenant: un châssis comportant deux côtés longitudinaux et deux côtés transversaux, un moteur et des engrenages, entraînant un rouleau, une tête d'impression thermique, un organe de pression de la tête sur le rouleau, caractérisé en ce que l'organe de pression de la tête sur le rouleau est un ressort selon l'une des revendications précédentes. 7. A thermal printing device comprising: a chassis comprising two longitudinal sides and two transverse sides, a motor and gears, driving a roller, a thermal printing head, a member for pressing the head on the roller, characterized in that the pressure member of the head on the roller is a spring according to one of the preceding claims.
PCT/FR1998/000486 1997-03-11 1998-03-11 Maintaining and compressing spring and its application in a compact printing device WO1998040642A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU68415/98A AU6841598A (en) 1997-03-11 1998-03-11 Maintaining and compressing spring and its application in a compact printing device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR97/02860 1997-03-11
FR9702860A FR2760685B1 (en) 1997-03-11 1997-03-11 HOLDING SPRING AND COMPRESSION AND ITS APPLICATION IN A COMPACT PRINTING DEVICE

Publications (1)

Publication Number Publication Date
WO1998040642A1 true WO1998040642A1 (en) 1998-09-17

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Application Number Title Priority Date Filing Date
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FR (1) FR2760685B1 (en)
WO (1) WO1998040642A1 (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US521124A (en) 1894-06-05 Section-insulator
US3892175A (en) 1972-06-23 1975-07-01 Kienzle Apparate Gmbh Printing needle drive
GB1407024A (en) 1972-04-06 1975-09-24 Raydyot Ltd Lamps
US4521124A (en) * 1982-11-15 1985-06-04 Caracteres S.A. Characters carrying print wheel disc for printing machine and method of manufacturing same
EP0306687A2 (en) 1987-09-08 1989-03-15 Hella KG Hueck & Co. Headlamp for a motor vehicle
US4872096A (en) 1988-01-15 1989-10-03 Valeo Vision Mechanism for locking and unlocking a lamp in a lamp holder particularly for use in an automobile vehicle
US5226634A (en) 1990-08-31 1993-07-13 Amp Incorporated Platform spring
EP0659574A2 (en) 1993-12-27 1995-06-28 Seiko Instruments Inc. Printer
EP0718110A1 (en) 1994-12-19 1996-06-26 Seiko Instruments Inc. Thermal print head mounting
EP0738606A1 (en) 1994-11-08 1996-10-23 Seiko Instruments Inc. Printer

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US521124A (en) 1894-06-05 Section-insulator
GB1407024A (en) 1972-04-06 1975-09-24 Raydyot Ltd Lamps
US3892175A (en) 1972-06-23 1975-07-01 Kienzle Apparate Gmbh Printing needle drive
US4521124A (en) * 1982-11-15 1985-06-04 Caracteres S.A. Characters carrying print wheel disc for printing machine and method of manufacturing same
EP0306687A2 (en) 1987-09-08 1989-03-15 Hella KG Hueck & Co. Headlamp for a motor vehicle
US4872096A (en) 1988-01-15 1989-10-03 Valeo Vision Mechanism for locking and unlocking a lamp in a lamp holder particularly for use in an automobile vehicle
US5226634A (en) 1990-08-31 1993-07-13 Amp Incorporated Platform spring
EP0659574A2 (en) 1993-12-27 1995-06-28 Seiko Instruments Inc. Printer
EP0738606A1 (en) 1994-11-08 1996-10-23 Seiko Instruments Inc. Printer
EP0718110A1 (en) 1994-12-19 1996-06-26 Seiko Instruments Inc. Thermal print head mounting

Also Published As

Publication number Publication date
FR2760685A1 (en) 1998-09-18
FR2760685B1 (en) 1999-06-04
AU6841598A (en) 1998-09-29

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