EP0057118B1 - Electromechanical printing mechanism for a serial parallel printer - Google Patents

Electromechanical printing mechanism for a serial parallel printer Download PDF

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Publication number
EP0057118B1
EP0057118B1 EP82400032A EP82400032A EP0057118B1 EP 0057118 B1 EP0057118 B1 EP 0057118B1 EP 82400032 A EP82400032 A EP 82400032A EP 82400032 A EP82400032 A EP 82400032A EP 0057118 B1 EP0057118 B1 EP 0057118B1
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EP
European Patent Office
Prior art keywords
motor
sheet
print head
rotary movement
movement
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
EP82400032A
Other languages
German (de)
French (fr)
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EP0057118A2 (en
EP0057118A3 (en
Inventor
Renaud Cuel
Henri Le Gledic
Yvon Le Meur
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.)
Thales SA
Original Assignee
Thomson CSF SA
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Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0057118A2 publication Critical patent/EP0057118A2/en
Publication of EP0057118A3 publication Critical patent/EP0057118A3/en
Application granted granted Critical
Publication of EP0057118B1 publication Critical patent/EP0057118B1/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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
    • B41J25/006—Mechanisms for bodily moving print heads or carriages parallel to the paper surface for oscillating, e.g. page-width print heads provided with counter-balancing means or shock absorbers
    • 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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/76—Line-spacing mechanisms
    • B41J19/78—Positive-feed mechanisms
    • B41J19/94—Positive-feed mechanisms automatically operated in response to carriage return

Definitions

  • the present invention relates to electromechanical printing devices for printers of the series-parallel type.
  • Serial-parallel type printers are well known. Their print head is driven by an alternating rectilinear movement parallel to the inscription lines and comprises n elements (n positive integer) each capable of printing a series of k consecutive dots on a line (k positive integer).
  • n elements n positive integer
  • k positive integer k positive integer
  • current printers use a rotary motor coupled to an eccentric (or to a cam) placed in a light formed in the print head.
  • these printers include an auxiliary rotary motor coupled to a device for moving the printing sheet, and a motor control circuit. This circuit controls the motors in order to animate the print head in an alternating linear movement parallel to the writing lines and to advance the printing sheet as soon as the writing of a line is finished.
  • the disadvantage of the two motors and their control circuit is that they are expensive.
  • a printing device comprising a single motor, a roller supporting a sheet, a fixed printing head, first transmission elements transforming the rotary movement generated by the motor into a rotation movement of the roller around its axis, for advancing the sheet, and second transmission elements transforming the rotary movement generated by the motor into a reciprocating and rectilinear movement moving the roller parallel to its axis and in synchronism with its rotational movement.
  • first transmission elements transforming the rotary movement generated by the motor into a rotation movement of the roller around its axis, for advancing the sheet
  • second transmission elements transforming the rotary movement generated by the motor into a reciprocating and rectilinear movement moving the roller parallel to its axis and in synchronism with its rotational movement.
  • patent application GB-A-2 046 177 describes a device comprising a movable print head; two rollers supporting the sheet of paper; first transmission elements for driving the paper, comprising: a cylinder pressing on the paper and provided with oblique grooves relative to its generatrices, grooves in which slides a finger secured to the print head, to cause a rotation of the cylinder when the print head is moved; and second transmission elements, for moving the head perpendicular to the direction of movement of the paper and in synchronism with this movement, comprising: a shaft provided with an endless groove, constituting a cam, causing a finger integral with the head, in an alternating linear displacement when the shaft turns in a constant direction.
  • the subject of the present invention is an electromechanical printing device having the advantage of: having only one rotary motor for controlling both the advance of the paper and the movement of the print head, which entails a cost. lower achievement; to include, for moving the roller, only a rotation mechanism, which is simple and which allows the roller to be easily moved to handle the sheet of paper; and to include, to move the head in two fixed positions, a simple and inexpensive device.
  • an electromechanical printing device for a printer of the series-parallel type, comprising: a printing head intended for printing a sheet; a rotary motor; a roller supporting the sheet; first transmission elements transforming the rotary movement generated by the motor into a rotational movement of the roller around its axis, to advance the sheet; second transmission elements transforming the rotary movement generated by the motor into a reciprocating and rectilinear movement applied to the print head, perpendicular and synchronous with the movement of advancement of the sheet to place the head in two fixed positions; is characterized in that the motor is a stepping motor; in that the second transmission elements comprise an eccentric mounted on the axis of the motor and placed in a lumen formed in the print head; in that the first transmission elements comprise a gear coupled to the motor and transmitting only one rotation pitch out of two from the motor, and means for transforming the rotational movement transmitted by the gear into a rotational movement applied to the roller .
  • FIG. 1 represents an embodiment of the device according to the invention for a thermal printer of the series-parallel type, the print head of which is the width of a line and is provided with n electrodes (not shown); each electrode capable of printing two points by moving the print head a distance equal to half the interval separating two consecutive electrodes.
  • This device comprises a rotary step-by-step motor 4, a thermal printing head 1 intended for printing a sheet of electrosensitive paper 2, a roller 3 on which the sheet of paper 2 is placed, and transmission elements transforming the rotary movement printed by the motor4, on the one hand in a rectilinear reciprocating movement animating the printing head 1, and on the other hand in a rotary movement animating the roller 3.
  • the direction of the rectilinear reciprocating movement printed at the printing head impression 1 is there. This direction is parallel to the inscription lines of the sheet 2 and to the axis of rotation of the roll 3.
  • a rotation of the roll 3 causes the sheet of paper to move in a direction perpendicular to the lines of registration.
  • the principle implemented by the transmission elements of the device consists in synchronizing the movements of the print head 1 and of the roller 3 in order to allow a paper advance at the end of the writing of a line and before the start. the registration of a new line.
  • the displacement of the print head 1 is generated by an eccentric 5 placed inside a light formed in the print head 1.
  • this eccentric 5 is coupled to the motor 4 by means of a transmission axis 6 which corresponds to the axis of rotation of the eccentric 5 and to the motor shaft 4.
  • the eccentric 5 transforms the stepwise rotation movement generated by the motor 4 into a reciprocating rectilinear movement, of direction y'y, animating the print head 1.
  • the displacement of the print head 1 is carried out from a first extreme position (position 1) to a second extreme position (position 2).
  • the pitch of the motor 4 is 90 ° and the number of stops of this motor during a cycle of the translational movement of the print head 1 is four. Each engine stop corresponds to an extreme position of the print head 1.
  • FIGS. 2a, 2b, 2c and 2d allow a better understanding of the movement animating the print head 1.
  • the print head 1 the transmission axis 6, the eccentric 5, and the rectangular section 30 of the light formed in the printing head 1, seen from the section plane AA of FIG. 1.
  • an orthogonal coordinate system OX 1 Y 1 has also been shown, the origin of which 0 corresponds to the center of the section of the transmission axis 6.
  • This coordinate system is only used to show the rotary movement of the 'eccentric 5.
  • the instants t i , tz, t 3 and t 4 correspond to the four instants at which the engine 4 stops during a cycle of the translational movement of the print head 1.
  • FIG. 2a corresponds to the position of the print head 1 at time t 1 .
  • This position is the first extreme position of the print head 1, it is position 1.
  • the transmission axis 6 rotates 90 ° and causes a linear displacement of the print head. impression 1. This displacement has the amplitude d.
  • the eccentric 5 and the print head 1 are in the position shown in Figure 2b.
  • This position corresponds to the second extreme position of the print head 1, this is position 2.
  • the transmission axis 6 again rotates 90 °, but this rotation does not cause no translation of the print head 1.
  • the print head 1 is therefore always in position 2 as shown in FIG. 2c.
  • the electrodes of the print head 1 are controlled to print the sheet at the characteristic instants t l , t 2 , t 3 and t 4 of each cycle of the movement of the print head 1. In fact, these instants correspond to on the one hand at the instants of stopping the printhead 1 and on the other hand at extreme positions of the printhead 1. For each writing line, it is necessary that each electrode can print two different dots.
  • the method consists in giving a first print order to the n electrodes at time t 1 , in moving the print head 1 between the instants t i and t 2 , in giving a second print order to the n electrodes at at time t 2 , to command an advance of the printing sheet between times t 2 and t 3 so as to present to the n electrodes a blank writing line, and so on.
  • transmission elements have been placed between the motor 4 and the roller 3 which transforms the rotary movement of the motor 4 into a rotary movement which only drives the roller 3 'between, on the one hand the instants t 2 and t 3 , and on the other hand the instants t 3 and t 4 of the rotation cycle of the motor 4.
  • the advance of the sheet will be controlled between the end of the registration of each line and the start of registration of the next line.
  • FIG. 1 The transmission elements which make it possible to implement this method are represented in FIG. 1.
  • the motor 4 is coupled to the roller 3 by means of a transmission consisting of: a first synchronous pulley 7, the axis of rotation of which corresponds to the axis 6, and a second synchronous pulley 9 linked to the synchronous pulley 7 by means of the toothed belt 8, of a worm 11 whose axis of rotation 10 of direction x'x corresponds to the axis of rotation of the pulley 9, of a toothed wheel 12 meshed with the worm 11, of a toothed wheel 13 whose axis of rotation 20 corresponds to l axis of rotation of the toothed wheel 12, and a toothed wheel 14 meshed with the toothed wheel 13 and having an axis of rotation 15 corresponding to the axis of rotation of the roller 3.
  • the transmission consisting of pulleys 7 and 9, the transmission axis 6, the axis of rotation 10, and the toothed belt 8, serves to drive the worm 11 in a rotational movement around the axis 10.
  • the multiplication ratio of this gear is 1, so that a 90 ° rotation of the motor shaft 4 corresponds to a 90 ° rotation of the screw 11.
  • the gear consisting of the toothed wheels 13 and 14 and transmission axes 15 and 20 it serves to drive the roller 3 in a rotational movement around the axis 15.
  • Each gear step of the tooth wheel 12 corresponds to a rotation of the roller 3 which drives an advance of sheet 2 over a length equal to the interval between two consecutive inscription lines.
  • the gear relating to the toothed wheel 12 and the worm 11 is the most complex. To better understand its operation, this gear has been represented in FIG. 3, seen from the section plane BB of FIG. 1.
  • the face of the tooth wheel 12 which is seen from this cutting plane BB comprises all of the teeth d i (i varying from 1 to 32). These teeth i have a cylindrical shape. They are distributed on a concentric circle at the circumference of the wheel and mesh successively in the thread of the endless screw 11.
  • the shape of the thread is alternately helical and circular.
  • the rhythm of the change in shape of the thread corresponds to a quadrant of the screw 11. In fact, as shown in FIG. 3, the thread of the screw 11 is circular on a quadrant of the screw, helical on the next quadrant, then circular And so on.
  • the screw comprises an active part, consisting of two quadrants comprising the thread of helical shape, and an inactive part consisting of two quadrants comprising the thread of circular shape.
  • the successive steps of rotation of the screw 11 correspond alternately a quadrant comprising the thread of circular shape and a quadrant comprising the thread of helical shape.
  • the screw 11 is previously positioned so that the active part of the screw corresponds to a pitch of rotation of the motor 4 taking place, either between the instants t 2 and t 3 , or between the instants t 4 and t i of each cycle of rotation, and that the inactive part corresponds to the rotation step taking place either between the instants t, and t 2 , or between the instants t s and t 4 .
  • the screw 11 generates a rotation of the toothed wheel 12 and therefore an advance of the sheet 2, only between the instants t 2 and t 3 and that between the instants t 4 and t i of each cycle of motor rotation 4.
  • the roll 3 can easily be moved away from the print head 1.
  • the toothed wheels 13 and 14 provide a convenient means for transmitting a rotational movement roller 3 while allowing it to move away from the print head 1.

Landscapes

  • Character Spaces And Line Spaces In Printers (AREA)
  • Impact Printers (AREA)
  • Common Mechanisms (AREA)

Description

La présente invention concerne les dispositifs électromécaniques d'impression pour imprimantes du type série-parallèle.The present invention relates to electromechanical printing devices for printers of the series-parallel type.

Les imprimantes de type série-parallèle sont bien connues. Leur tête d'impression est animée d'un mouvement rectiligne alternatif parallèle aux lignes d'inscription et comporte n éléments (n entier positif) pouvant imprimer chacun une suite de k points consécutifs sur une ligne (k entier positif). Pour assurer le déplacement de la tête d'impression, les imprimantes actuelles utilisent un moteur rotatif couplé à un excentrique (ou à une came) placé dans une lumière ménagée dans la tête d'impression. En outre, ces imprimantes comportent un moteur rotatif auxiliaire couplé à un dispositif de déplacement de la feuille d'impression, et un circuit de commande des moteurs. Ce circuit commande les moteurs afin d'animer la tête d'impression d'un mouvement linéaire alternatif parallèle aux lignes d'inscription et d'avancer la feuille d'impression des que l'inscription d'une ligne est terminée. Les deux moteurs et leur circuit de commande ont pour inconvénient d'être coûteux.Serial-parallel type printers are well known. Their print head is driven by an alternating rectilinear movement parallel to the inscription lines and comprises n elements (n positive integer) each capable of printing a series of k consecutive dots on a line (k positive integer). To ensure the displacement of the print head, current printers use a rotary motor coupled to an eccentric (or to a cam) placed in a light formed in the print head. In addition, these printers include an auxiliary rotary motor coupled to a device for moving the printing sheet, and a motor control circuit. This circuit controls the motors in order to animate the print head in an alternating linear movement parallel to the writing lines and to advance the printing sheet as soon as the writing of a line is finished. The disadvantage of the two motors and their control circuit is that they are expensive.

Par ailleurs il est connu un dispositif d'impression comportant un seul moteur, un rouleau supportant une feuille, une tête d'impression fixe, des premiers éléments de transmission transformant le mouvement rotatif généré par le moteur en un mouvement de rotation du rouleau autour de son axe, pour faire avancer la feuille, et des seconds éléments de transmission transformant le mouvement rotatif généré par le moteur en un mouvement alternatif et rectiligne déplaçant le rouleau parallèlement à son axe et en synchronisme avec son mouvement de rotation. Un tel dispositif est décrit dans la demande de brevet européen n° 80400632.8 (n° de publication 0 020 212), il a pour inconvénient un accès difficile à la feuille de papier, la tête d'impression étant fixée au chassis, d'une part, et d'autre part le rouleau étant relié au chassis par deux systèmes de transmission mécanique, l'un pour assurer son déplacement alternatif et rectiligne et l'autre pour assurer sa rotation.Furthermore, a printing device is known comprising a single motor, a roller supporting a sheet, a fixed printing head, first transmission elements transforming the rotary movement generated by the motor into a rotation movement of the roller around its axis, for advancing the sheet, and second transmission elements transforming the rotary movement generated by the motor into a reciprocating and rectilinear movement moving the roller parallel to its axis and in synchronism with its rotational movement. Such a device is described in European patent application No. 80400632.8 (publication No. 0 020 212), it has the disadvantage of difficult access to the sheet of paper, the print head being fixed to the chassis, of a on the one hand, and on the other hand the roller being connected to the chassis by two mechanical transmission systems, one to ensure its alternating and rectilinear movement and the other to ensure its rotation.

D'autre part, la demande de brevet GB-A-2 046 177 décrit un dispositif comportant une tête d'impression mobile; deux rouleaux supportant la feuille de papier; des premiers éléments de transmission pour entrainer le papier, comportant: un cylindre appuyant sur le papier et muni de rainures obliques par rapport à ses génératrices, rainures dans lesquelles coulisse un doigt solidaire de la tête d'impression, pour provoquer une rotation du cylindre quand la tête d'impression est déplacée; et des seconds éléments de transmission, pour déplacer la tête perpendiculairement à la direction de déplacement du papier et en synchronisme avec ce déplacement, comportant: un arbre muni d'une rainure sans fin, constituant une came, entrainant un doigt solidaire de la tête, dans un déplacement linéaire alternatif lorsque l'arbre tourne dans un sens constant. Ces seconds éléments de transmission permettent de déplacer la tête d'impression continuement le long d'une ligne d'impression pour imprimer à la volée en un grand nombre d'emplacements, par contre c'est un mécanisme relativement compliqué à réaliser. Il est inutilement compliqué lorsqu'il s'agit de placer la tête d'impressions selon deux positions fixées.On the other hand, patent application GB-A-2 046 177 describes a device comprising a movable print head; two rollers supporting the sheet of paper; first transmission elements for driving the paper, comprising: a cylinder pressing on the paper and provided with oblique grooves relative to its generatrices, grooves in which slides a finger secured to the print head, to cause a rotation of the cylinder when the print head is moved; and second transmission elements, for moving the head perpendicular to the direction of movement of the paper and in synchronism with this movement, comprising: a shaft provided with an endless groove, constituting a cam, causing a finger integral with the head, in an alternating linear displacement when the shaft turns in a constant direction. These second transmission elements allow the print head to be moved continuously along a print line to print on the fly in a large number of locations, on the other hand it is a relatively complicated mechanism to produce. It is unnecessarily complicated when it comes to placing the print head in two fixed positions.

La présente invention a pour objet un dispositif électromécanique d'impression ayant pour avantage: de ne comporter qu'un seul moteur rotatif pour commander à la fois l'avance du papier et le déplacement de la tête d'impression, ce qui entraîne un coût de réalisation moins élevé; de comporter, pour mouvoir le rouleau, seulement un mécanisme de rotation, qui est simple et qui permet de déplacer facilement le rouleau pour manipuler la feuille de papier; et de comporter, pour mouvoir la tête selon deux positions fixées, un dispositif simple et peu coûteux.The subject of the present invention is an electromechanical printing device having the advantage of: having only one rotary motor for controlling both the advance of the paper and the movement of the print head, which entails a cost. lower achievement; to include, for moving the roller, only a rotation mechanism, which is simple and which allows the roller to be easily moved to handle the sheet of paper; and to include, to move the head in two fixed positions, a simple and inexpensive device.

Selon l'invention, un dispositif électromécanique d'impression pour imprimante du type série-parallèle, comportant: une tête d'impression destinée à imprimer une feuille; un moteur rotatif; un rouleau supportant la feuille; des premiers éléments de transmission transformant le mouvement rotatif généré par le moteur en un mouvement de rotation du rouleau autour de son axe, pour faire avancer la feuille; des seconds éléments de transmission transformant le mouvement rotatif généré par le moteur en un mouvement alternatif et rectiligne appliqué à la tête d'impression, perpendiculaire et synchrone avec le mouvement d'avancement de la feuille pour placer la tête selon deux positions fixées; est caractérisé en ce que le moteur est un moteur pas à pas; en ce que les seconds éléments de transmission comportent un excentrique monté sur l'axe du moteur et placé dans une lumière ménagée dans la tête d'impression; en ce que les premiers éléments de transmission comportent un engrenage couplé au moteur et ne transmettant qu'un pas de rotration sur deux du moteur, et des moyens de transformation du mouvement de rotation transmis par l'engrenage en un mouvement de rotation appliqué au rouleau.According to the invention, an electromechanical printing device for a printer of the series-parallel type, comprising: a printing head intended for printing a sheet; a rotary motor; a roller supporting the sheet; first transmission elements transforming the rotary movement generated by the motor into a rotational movement of the roller around its axis, to advance the sheet; second transmission elements transforming the rotary movement generated by the motor into a reciprocating and rectilinear movement applied to the print head, perpendicular and synchronous with the movement of advancement of the sheet to place the head in two fixed positions; is characterized in that the motor is a stepping motor; in that the second transmission elements comprise an eccentric mounted on the axis of the motor and placed in a lumen formed in the print head; in that the first transmission elements comprise a gear coupled to the motor and transmitting only one rotation pitch out of two from the motor, and means for transforming the rotational movement transmitted by the gear into a rotational movement applied to the roller .

L'invention sera mieux comprise et d'autres caractéristiques apparaîtront à l'aide de la description et des dessins s'y rapportant sur lesquels:

  • la figure 1 est un exemple d'un mode de réalisation du dispositif selon l'invention;
  • les figures 2 et 3 représentent des éléments du dispositif vus selon des plans de coupe de la figure 1.
The invention will be better understood and other characteristics will appear from the description and the drawings relating thereto, in which:
  • Figure 1 is an example of an embodiment of the device according to the invention;
  • FIGS. 2 and 3 represent elements of the device seen along the section planes of FIG. 1.

La figure 1 représente un mode de réalisation du dispositif selon l'invention pour une imprimante thermique du type série-parallèle dont la tête d'impression a la largeur d'une ligne et est munie de n électrodes (non représentées); chaque électrode pouvant imprimer deux points par un déplacement de la tête d'impression d'une distance égale à la moitié de l'intervalle séparant deux électrodes consécutives.FIG. 1 represents an embodiment of the device according to the invention for a thermal printer of the series-parallel type, the print head of which is the width of a line and is provided with n electrodes (not shown); each electrode capable of printing two points by moving the print head a distance equal to half the interval separating two consecutive electrodes.

Ce dispositif comporte un moteur rotatif pas à pas 4, une tête d'impression thermique 1 destinée à imprimer une feuille de papier électrosen- sible 2, un rouleau 3 sur lequel est placé la feuille de papier 2, et des éléments de transmission transformant le mouvement rotatif imprimé par le moteur4, d'une part en un mouvement alternatif rectiligne animant la tête d'impression 1, et d'autre part en un mouvement rotatif animant le rouleau 3. La direction du mouvement alternatif rectiligne imprimé à la tête d'impression 1 est y'y. Cette direction est parallèle aux lignes d'inscription de la feuille 2 et à l'axe de rotation du rouleau 3. Il en résulte qu'une rotation du rouleau 3 entraîne un déplacement de la feuille de papier dans une direction perpendiculaire aux lignes d'inscription.This device comprises a rotary step-by-step motor 4, a thermal printing head 1 intended for printing a sheet of electrosensitive paper 2, a roller 3 on which the sheet of paper 2 is placed, and transmission elements transforming the rotary movement printed by the motor4, on the one hand in a rectilinear reciprocating movement animating the printing head 1, and on the other hand in a rotary movement animating the roller 3. The direction of the rectilinear reciprocating movement printed at the printing head impression 1 is there. This direction is parallel to the inscription lines of the sheet 2 and to the axis of rotation of the roll 3. As a result, a rotation of the roll 3 causes the sheet of paper to move in a direction perpendicular to the lines of registration.

Le principe mis en oeuvre par les éléments de transmission du dispositif consiste à synchroniser les mouvements de la tête d'impression 1 et du rouleau 3 afin de permettre une avance du papier à la fin de l'inscription d'une ligne et avant le début de l'inscription d'une nouvelle ligne.The principle implemented by the transmission elements of the device consists in synchronizing the movements of the print head 1 and of the roller 3 in order to allow a paper advance at the end of the writing of a line and before the start. the registration of a new line.

Le déplacement de la tête d'impression 1 est engendré par un excentrique 5 placé à l'intérieur d'une lumière ménagée dans la tête d'impression 1. En effet, cet excentrique 5 est couplé au moteur 4 par l'intermédiaire d'un axe de transmission 6 qui correspond à l'axe de rotation de l'excentrique 5 et à l'arbre du moteur4. Il s'ensuit que l'excentrique 5 transforme le mouvement de rotation pas à pas engendré par le moteur 4 en un mouvement rectiligne alternatif, de direction y'y, animant la tête d'impression 1. Le déplacement de la tête d'impression 1 s'effectue d'une première position extrême (position 1) à une seconde position extrême (position 2). Le pas du moteur 4 est de 90° et le nombre d'arrêts de ce moteur pendant un cycle du mouvement de translation de la tête d'impression 1 est quatre. Chaque arrêt du moteur correspond à une position extrême de la tête d'impression 1.The displacement of the print head 1 is generated by an eccentric 5 placed inside a light formed in the print head 1. In fact, this eccentric 5 is coupled to the motor 4 by means of a transmission axis 6 which corresponds to the axis of rotation of the eccentric 5 and to the motor shaft 4. It follows that the eccentric 5 transforms the stepwise rotation movement generated by the motor 4 into a reciprocating rectilinear movement, of direction y'y, animating the print head 1. The displacement of the print head 1 is carried out from a first extreme position (position 1) to a second extreme position (position 2). The pitch of the motor 4 is 90 ° and the number of stops of this motor during a cycle of the translational movement of the print head 1 is four. Each engine stop corresponds to an extreme position of the print head 1.

Les figures 2a, 2b, 2c et 2d permettent de mieux comprendre le mouvement animant la tête d'impression 1. Sur ces figures, sont représentés la tête d'impression 1, l'axe de transmission 6, l'excentrique 5, et la section rectangulaire 30 de la lumière ménagée dans la tête d'impression 1, vus du plan de coupe AA de la figure 1.FIGS. 2a, 2b, 2c and 2d allow a better understanding of the movement animating the print head 1. In these figures, the print head 1, the transmission axis 6, the eccentric 5, and the rectangular section 30 of the light formed in the printing head 1, seen from the section plane AA of FIG. 1.

Sur ces figures, il a aussi été représenté un repère orthogonal OX1Y1 dont l'origine 0 correspond au centre de la section de l'axe de transmission 6. Ce repère n'est utilisé que pour faire apparaître le mouvement rotatif de l'excentrique 5. Les instants ti, tz, t3 et t4 correspondent aux quatre instants auxquels ont lieu l'arrêt du moteur 4 pendant un cycle du mouvement de translation de la tête d'impression 1.In these figures, an orthogonal coordinate system OX 1 Y 1 has also been shown, the origin of which 0 corresponds to the center of the section of the transmission axis 6. This coordinate system is only used to show the rotary movement of the 'eccentric 5. The instants t i , tz, t 3 and t 4 correspond to the four instants at which the engine 4 stops during a cycle of the translational movement of the print head 1.

La figure 2a correspond à la position de la tête d'impression 1 à l'instant t1. Cette position est la première position extrême de la tête d'impression 1, c'est la position 1. Entre les instants t1 et tz, l'axe de transmission 6 tourne de 90° et entraîne un déplacement linéaire de la tête d'impression 1. Ce déplacement a pour amplitude d. A l'instant t2, l'excentrique 5 et la tête d'impression 1 sont dans la position représentée sur la figure 2b. Cette position correspond à la seconde position extrême de la tête d'impression 1, c'est la position 2. Entre les instants t2 et t3, l'axe de transmission 6 tourne de nouveau de 90°, mais cette rotation ne provoque pas de translation de la tête d'impression 1. A l'instant ts, la tête d'impression 1 est donc toujours dans la position 2 comme représenté sur la figure 2c. Entre les instants t3 et t4, l'axe de transmission 6 tourne encore de 90°. Cette fois-ci, la tête d'impression 1 est déplacée de la position 2 à la position 1. A l'instant t4, la tête d'impression 1 est donc dans la position 1 comme représentée sur la figure 2d. Enfin, entre l'instant t4 et l'instant ti du cycle suivant, a lieu nue nouvelle rotation de 90° de l'axe de transmission 6. A l'instant t1 du cycle suivant, la position de la tête d'impression 1 est alors de nouveau celle montrée sur la figure 2a, c'est-à-dire la position 1. Le mouvement cyclique se poursuit ensuite comme il a été décrit.FIG. 2a corresponds to the position of the print head 1 at time t 1 . This position is the first extreme position of the print head 1, it is position 1. Between times t 1 and tz, the transmission axis 6 rotates 90 ° and causes a linear displacement of the print head. impression 1. This displacement has the amplitude d. At time t 2 , the eccentric 5 and the print head 1 are in the position shown in Figure 2b. This position corresponds to the second extreme position of the print head 1, this is position 2. Between the instants t 2 and t 3 , the transmission axis 6 again rotates 90 °, but this rotation does not cause no translation of the print head 1. At time t s , the print head 1 is therefore always in position 2 as shown in FIG. 2c. Between instants t 3 and t 4 , the transmission axis 6 still rotates 90 °. This time, the print head 1 is moved from position 2 to position 1. At time t 4 , the print head 1 is therefore in position 1 as shown in FIG. 2d. Finally, between time t 4 and time t i of the following cycle, there is a new 90 ° rotation of the transmission axis 6. At time t 1 of the following cycle, the position of the head d impression 1 is then again that shown in FIG. 2a, that is to say position 1. The cyclic movement then continues as described.

Les électrodes de la tête d'impression 1 sont commandées pour imprimer la feuille aux instants caractéristiques tl, t2, t3 et t4 de chaque cycle du mouvement de la tête d'impression 1. En effet, ces instants correspondent d'une part aux instants d'arrêt de la tête d'impression 1 et d'autre part à des positions extrêmtes de la tête d'impression 1. Pour chaque ligne d'inscription, il est nécessaire que chaque électrode puisse imprimer deux points différents. La méthode consiste à donner un premier ordre d'impression aux n électrodes à l'instant t1, à déplacer la tête d'impression 1 entre les instants ti et t2, à donner un deuxième ordre d'impression aux n électrodes à l'instant t2, à commander une avance de la feuille d'impression entre les instants t2 et t3 de façon à présenter aux n électrodes une ligne d'inscription vierge, et ainsi de suite. Pour mettre en oeuvre cette méthode à l'aide du seul moteur 4, il a été placé entre le moteur 4 et le rouleau 3 des éléments de transmission qui transforme le mouvement rotatif du moteur 4 en un mouvement rotatif n'animant le rouleau 3 qu'entre, d'une part les instants t2 et t3, et d'autre part les instants t3 et t4 du cycle de rotation du moteur 4. Ainsi l'avance de la feuille sera commandée entre la fin de l'inscription de chaque ligne et le début de l'inscription de la ligne suivante.The electrodes of the print head 1 are controlled to print the sheet at the characteristic instants t l , t 2 , t 3 and t 4 of each cycle of the movement of the print head 1. In fact, these instants correspond to on the one hand at the instants of stopping the printhead 1 and on the other hand at extreme positions of the printhead 1. For each writing line, it is necessary that each electrode can print two different dots. The method consists in giving a first print order to the n electrodes at time t 1 , in moving the print head 1 between the instants t i and t 2 , in giving a second print order to the n electrodes at at time t 2 , to command an advance of the printing sheet between times t 2 and t 3 so as to present to the n electrodes a blank writing line, and so on. To implement this method using only the motor 4, transmission elements have been placed between the motor 4 and the roller 3 which transforms the rotary movement of the motor 4 into a rotary movement which only drives the roller 3 'between, on the one hand the instants t 2 and t 3 , and on the other hand the instants t 3 and t 4 of the rotation cycle of the motor 4. Thus the advance of the sheet will be controlled between the end of the registration of each line and the start of registration of the next line.

Les éléments de transmission qui permettent de mettre de oeuvre cette méthode sont représentés sur la figure 1. Sur cette figure, il apparaît que le moteur 4 est couplé au rouleau 3 par l'intermédiaire d'une transmission constituée: d'une première poulie synchrone 7 dont l'axe de rotation correspond à l'axe 6, et d'une deuxième poulie synchrone 9 liée à la poulie synchrone 7 par l'intermédiaire de la courroie crantée 8, d'une vis sans fin 11 dont l'axe de rotation 10 de direction x'x correspond à l'axe de rotation de la poulie 9, d'une roue à dents 12 engrenée à la vis sans fin 11, d'une roue dentée 13 dont l'axe de rotation 20 correspond à l'axe de rotation de la roue dentée 12, et d'une roue dentée 14 engrenée à la roue dentée 13 et ayant un axe de rotation 15 correspondant à l'axe de rotation du rouleau 3.The transmission elements which make it possible to implement this method are represented in FIG. 1. In this figure, it appears that the motor 4 is coupled to the roller 3 by means of a transmission consisting of: a first synchronous pulley 7, the axis of rotation of which corresponds to the axis 6, and a second synchronous pulley 9 linked to the synchronous pulley 7 by means of the toothed belt 8, of a worm 11 whose axis of rotation 10 of direction x'x corresponds to the axis of rotation of the pulley 9, of a toothed wheel 12 meshed with the worm 11, of a toothed wheel 13 whose axis of rotation 20 corresponds to l axis of rotation of the toothed wheel 12, and a toothed wheel 14 meshed with the toothed wheel 13 and having an axis of rotation 15 corresponding to the axis of rotation of the roller 3.

La transmission constituée des poulies 7 et 9, de l'axe de transmission 6, de l'axe de rotation 10, et de la courroie crantée 8, sert à entraîner la vis sans fin 11 dans un mouvement de rotation autour de l'axe 10. Le rapport de multiplication de cet engrenage est 1, si bien qu'à une rotation de 90° de l'arbre du moteur 4 correspond une rotation de 90° de la vis 11. Quant à l'engrenage constitué des roues dentées 13 et 14 et des axes de transmission 15 et 20, il sert à entraîner le rouleau 3 dans un mouvement de rotation autour de l'axe 15. A chaque pas d'engrenage de la roue à dents 12 correspond une rotation du rouleau 3 qui entraîne une avance de la feuille 2 sur une longueur égale à l'intervalle entre deux lignes d'inscription consécutives.The transmission consisting of pulleys 7 and 9, the transmission axis 6, the axis of rotation 10, and the toothed belt 8, serves to drive the worm 11 in a rotational movement around the axis 10. The multiplication ratio of this gear is 1, so that a 90 ° rotation of the motor shaft 4 corresponds to a 90 ° rotation of the screw 11. As for the gear consisting of the toothed wheels 13 and 14 and transmission axes 15 and 20, it serves to drive the roller 3 in a rotational movement around the axis 15. Each gear step of the tooth wheel 12 corresponds to a rotation of the roller 3 which drives an advance of sheet 2 over a length equal to the interval between two consecutive inscription lines.

L'engrenage relativ à la roue à dents 12 et à la vis sans fin 11 est le plus complexe. Pour mieux comprendre son fonctionnement cet engrenage a été représenté sur la figure 3, vu du plan de coupe BB de la figure 1.The gear relating to the toothed wheel 12 and the worm 11 is the most complex. To better understand its operation, this gear has been represented in FIG. 3, seen from the section plane BB of FIG. 1.

La face de la roue à dents 12 qui est vue de ce plan de coupe BB comporte la totalité des dents di (i variant de 1 à 32). Ces dents di ont une forme cylindrique. Elles sont réparties sur un cercle concentrique à la circonférence de la roue et s'engrènent successivement dans le filet de la vis sans fin 11. La forme du filet est alternativement hélicoïdal et circulaire. Le rythme du changement de forme du filet correspond à un quadrant de la vis 11. En effet, comme représenté sur la figure 3, le filet de la vis 11 est circulaire sur un quadrant de la vis, hélicoïdal sur le quadrant suivant, puis circulaire et ainsi de suite. Il peut donc être considéré que la vis comprend une partie active, constituée des deux quadrants comportant le filet de forme hélicoïdale, et une partie inactive constituée des deux quadrants comportant le filet de forme circulaire. Aux pas successifs de rotation de la vis 11 correspondent alternativement un quadrant comportant le filet de forme circulaire et un quadrant comportant le filet de forme hélicoïdale. La vis 11 est préalablement positionnée de façon que la partie active de la vis corresponde à un pas de rotation du moteur 4 ayant lieu, soit entre les instants t2 et t3, soit entre les instants t4 et ti de chaque cycle de rotation, et que la partie inactive corresponde au pas de rotation ayant lieu soit entre les instants t, et t2, soit entre les instants ts et t4.The face of the tooth wheel 12 which is seen from this cutting plane BB comprises all of the teeth d i (i varying from 1 to 32). These teeth i have a cylindrical shape. They are distributed on a concentric circle at the circumference of the wheel and mesh successively in the thread of the endless screw 11. The shape of the thread is alternately helical and circular. The rhythm of the change in shape of the thread corresponds to a quadrant of the screw 11. In fact, as shown in FIG. 3, the thread of the screw 11 is circular on a quadrant of the screw, helical on the next quadrant, then circular And so on. It can therefore be considered that the screw comprises an active part, consisting of two quadrants comprising the thread of helical shape, and an inactive part consisting of two quadrants comprising the thread of circular shape. The successive steps of rotation of the screw 11 correspond alternately a quadrant comprising the thread of circular shape and a quadrant comprising the thread of helical shape. The screw 11 is previously positioned so that the active part of the screw corresponds to a pitch of rotation of the motor 4 taking place, either between the instants t 2 and t 3 , or between the instants t 4 and t i of each cycle of rotation, and that the inactive part corresponds to the rotation step taking place either between the instants t, and t 2 , or between the instants t s and t 4 .

Ainsi, la vis 11 n'engendre une rotation de la roue à dents 12 et donc une avance de la feuille 2, qu'entre les instants t2 et t3 et qu'entre les instants t4 et ti de chaque cycle de rotation du moteur 4.Thus, the screw 11 generates a rotation of the toothed wheel 12 and therefore an advance of the sheet 2, only between the instants t 2 and t 3 and that between the instants t 4 and t i of each cycle of motor rotation 4.

Le fonctionnement du dispositif d'impression selon l'invention pendant un cycle de rotation du moteur 4 se résume de la façon suivante:

  • Instant t1:
    • la tête d'impression 1 est dans la position 1 ; les n électrodes sont commandées pour imprimer au plus n points sur une ligne x de la feuille 3.
  • Entre les instants ti et t2:
    • la tête d'impression 1 est déplacée de la position 1 à la position 2. La feuille 3 n'est pas déplacée.
  • Instant t2:
    • la tête d'impression 1 est dans la position 2; les n électrodes sont commandées pour imprimer au plus n points sur la ligne x de la feuille 3.
  • Entre les instants t2 et ta:
    • la feuille de papier 3 est avancée. La tête d'impression 1 reste dans la position 2.
  • Instant t3:
    • la tête d'impression 1 est dans la positon 2; les n électrodes sont commandées pour imprimer au plus n points sur la ligne Z suivant la ligne x.
  • Entre les instants t3 et t4:
    • La tête d'impression 1 est déplacée de la position 2 à la position 1. La feuille de papier 3 n'est pas avancée.
  • Instant t4:
    • la tête d'impression 1 est dans la position 1; les n électrodes sont commandées pour une nouvelle impression de la ligne z.
  • Entre l'instant t4 et l'instant t1 d'un nouveau cycle de rotation:
    • la tête d'impression 1 reste dans la position 1. La feuille 3 est avancée. Puis le cycle du mouvement reprend.
The operation of the printing device according to the invention during a rotation cycle of the motor 4 can be summarized as follows:
  • Instant t 1 :
    • the print head 1 is in position 1; the n electrodes are ordered to print at most n points on a line x of sheet 3.
  • Between the instants t i and t 2 :
    • the print head 1 is moved from position 1 to position 2. The sheet 3 is not moved.
  • Instant t 2 :
    • the print head 1 is in position 2; the n electrodes are ordered to print at most n points on line x of sheet 3.
  • Between times t 2 and t a :
    • sheet of paper 3 is advanced. The print head 1 remains in position 2.
  • Instant t 3 :
    • the print head 1 is in position 2; the n electrodes are controlled to print at most n points on line Z along line x.
  • Between times t 3 and t 4 :
    • The print head 1 is moved from position 2 to position 1. The sheet of paper 3 is not advanced.
  • Instant t 4 :
    • the print head 1 is in position 1; the n electrodes are ordered for a new printing of the line z.
  • Between time t 4 and time t 1 of a new rotation cycle:
    • the print head 1 remains in position 1. The sheet 3 is advanced. Then the movement cycle resumes.

Pour manipuler la feuille de papier 2, par exemple quand on installe un nouveau rouleau de papier, le rouleau 3 peut facilement être écarté de la tête d'impression 1. Les roues dentées 13 et 14 constituent un moyen commode pour transmettre un mouvement de rotation au rouleau 3 tout en permettant de l'écarter de la tête d'impression 1.To handle the sheet of paper 2, for example when installing a new paper roll, the roll 3 can easily be moved away from the print head 1. The toothed wheels 13 and 14 provide a convenient means for transmitting a rotational movement roller 3 while allowing it to move away from the print head 1.

Il est à la portée de l'homme de l'art d'utiliser d'autres éléments pour réaliser cette transmission d'un mouvement de rotation synchrone, notamment d'utiliser deux poulies synchrones reliées par une courroie crantée.It is within the reach of those skilled in the art to use other elements to achieve this transmission of a synchronous rotational movement, in particular to use two synchronous pulleys connected by a toothed belt.

L'invention n'est pas limitée aux modes de réalisation décrits et représentés. En particulier, il est à la portée de l'homme de l'art de réaliser des engrenages autres que ceux décrits sans sortir du cadre de l'invention.The invention is not limited to the embodiments described and shown. In particular, it is within the reach of those skilled in the art to produce gears other than those described without departing from the scope of the invention.

Claims (2)

1. Electromechanic printing device for a printer of the serial-parallel type, comprising: a printing head (1) for imprinting on a sheet (2); a rotary motor (4); a roller (3) carrying said sheet (2); first transmission members transforming the rotary movement generated by the motor (4) into a rotary movement of the roller (3) about its axis for causing said sheet (2) to advance; second transmission means (5 and 6) transforming the rotary movement generated by the motor (4) into an alternating and rectilinear movement applied to the printing head (4) perpendicularly to and in synchronism with the advancing movement of the sheet (2) for placing the head (1) in accordance with two fixed positions; characterized in that the motor (4) is a step motor; that the second transmission members comprise an eccentric (5) mounted on the axis of the motor (4) and located in an opening provided in the printing head (1); in that the first transmission members comprise a gearing (11, 12) coupled to the motor (4) and transmitting only one out of two turns of the motor (4), and means (12 to 15) for transforming the rotary movement transmitted by the gearing into a rotary movement applied to the roller (3).
2. Device according to claim 2, characterized in that the gearing comprises: a worm-screw (11); a gear-wheel (12) meshing with the worm-screw (11) and driven with a rotary movement corresponding to the rotary movement transmitted by the gearing, and a transmissio device (6, 7, 8, 9 and 10) transmitting the rotary movement of the motor (4) to the worm-screw (11); in that the worm-screw (11) comprises a thread composed of sectors of alternatingly circular and helicoidal shape; and in that each sector of the thread corresponds to one rotary step of the motor (4).
EP82400032A 1981-01-27 1982-01-08 Electromechanical printing mechanism for a serial parallel printer Expired EP0057118B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8101464A FR2498524B1 (en) 1981-01-27 1981-01-27 ELECTROMECHANICAL PRINTING DEVICE FOR SERIAL-PARALLEL PRINTER AND FAX MACHINE COMPRISING SUCH A DEVICE
FR8101464 1981-01-27

Publications (3)

Publication Number Publication Date
EP0057118A2 EP0057118A2 (en) 1982-08-04
EP0057118A3 EP0057118A3 (en) 1982-08-18
EP0057118B1 true EP0057118B1 (en) 1985-01-23

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Application Number Title Priority Date Filing Date
EP82400032A Expired EP0057118B1 (en) 1981-01-27 1982-01-08 Electromechanical printing mechanism for a serial parallel printer

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US (1) US4420763A (en)
EP (1) EP0057118B1 (en)
JP (1) JPS57144781A (en)
DE (1) DE3261980D1 (en)
FR (1) FR2498524B1 (en)

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US4520371A (en) * 1982-12-30 1985-05-28 International Business Machines Corporation Multi-zone thermal print head
JPS59187459U (en) * 1983-05-31 1984-12-12 アルプス電気株式会社 thermal printer
JPS6015170A (en) * 1983-07-08 1985-01-25 Hitachi Koki Co Ltd Shuttle mechanism
IT1162944B (en) * 1983-09-29 1987-04-01 Olivetti & Co Spa MACHINE OF INTERLINEA FOR WRITING MACHINE
JPS60161160A (en) * 1984-01-31 1985-08-22 Nec Home Electronics Ltd Dot line printer
IT1228366B (en) * 1989-03-13 1991-06-14 Leptons Italia Srl THERMAL PRINTER PARTICULARLY FOR LABELS.
US5106216A (en) * 1989-11-22 1992-04-21 Samsung Electronics Co., Ltd. Device for driving a platen and carriage of a printing machine
JP3334185B2 (en) * 1991-10-14 2002-10-15 セイコーエプソン株式会社 Printer
CA2130762C (en) * 1994-08-24 1999-07-06 Eva Anne Turley Treatment of disease and conditions associated with macrophage infiltration
US5433543A (en) * 1993-10-29 1995-07-18 Hewlett-Packard Company Media feed and carriage motion mechanism for shuttle-type printers
JPH08267871A (en) * 1995-02-03 1996-10-15 Alps Electric Co Ltd Thermal printer

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IT1000641B (en) * 1973-12-28 1976-04-10 Olivetti & Co Spa PERFECTED ELECTROTHERMIC PRINTING UNIT
FR2300678A1 (en) * 1975-02-13 1976-09-10 Logabax PRINTING DEVICE FOR FAST PRINTERS
JPS5829761B2 (en) * 1975-08-13 1983-06-24 住友化学工業株式会社 Hydrous insecticidal composition
CA1122477A (en) * 1978-02-27 1982-04-27 Akira Katsura Printer
IT1108649B (en) * 1978-04-14 1985-12-09 Olivetti C Ing E C Spa POINT PRINTING DEVICE
GB2046177B (en) * 1979-03-26 1983-04-20 Seiko Instr & Electronics Printer
FR2457772A1 (en) * 1979-05-31 1980-12-26 Enertec PRINTING DEVICE WITH TRANSVERSAL MOVEMENT RELATIVE TO A PRINTING HEAD AND TO A PRINTING MEDIUM APPLIED ON A ROLLER

Also Published As

Publication number Publication date
DE3261980D1 (en) 1985-03-07
EP0057118A2 (en) 1982-08-04
FR2498524A1 (en) 1982-07-30
EP0057118A3 (en) 1982-08-18
US4420763A (en) 1983-12-13
JPS57144781A (en) 1982-09-07
FR2498524B1 (en) 1986-07-25

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