EP0317777A1 - Impression quality control process for ink jet printers - Google Patents
Impression quality control process for ink jet printers Download PDFInfo
- Publication number
- EP0317777A1 EP0317777A1 EP88117796A EP88117796A EP0317777A1 EP 0317777 A1 EP0317777 A1 EP 0317777A1 EP 88117796 A EP88117796 A EP 88117796A EP 88117796 A EP88117796 A EP 88117796A EP 0317777 A1 EP0317777 A1 EP 0317777A1
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- European Patent Office
- Prior art keywords
- drops
- control frame
- points
- printing
- point
- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
- B41J2/125—Sensors, e.g. deflection sensors
Definitions
- the invention relates to a method for controlling the printing of an inkjet printer.
- the aim of the present invention is to solve these problems by describing a method and a device making it possible to predict the imminence of a quality break: - identify the break in quality as soon as possible after its appearance; - stop the production line or replace the marking machine before it is too late.
- the invention relates more precisely to a method for controlling the print quality of an inkjet printer characterized in that it consists of: - create a control frame at specific times and positions in the marking; - reading this control frame to compare it to a reference frame.
- One of the characteristics of the method according to the invention resides in the fact that it consists, on the one hand, of creating a specific control frame and this at determined times and / or positions, and on the other hand of reading it. in order to compare it to a control frame of the same type serving as a reference.
- the control frame can be either autonomous, that is to say independent of the text to be printed, or linked to the printer or to other control members of the chain.
- the reason to be checked is defined and specified in the real-time control system.
- control frame consists of a series of dots which can be printed either systematically, or regularly at a fixed frequency, or regularly at a frequency resulting from a process learning related to specific operating conditions.
- This control frame is therefore printed in addition to the useful message, in general, but not limited to, before this.
- control frame is defined as a frame composed of a succession of remarkable points. These points are positioned so that their verification makes it possible to guarantee with sufficient probability that the printing is correct. For a given frame and under normal operating conditions, the position of the different impacts is perfectly known and unique within a given tolerance.
- a control frame consists, as shown in FIG. 1, of a matrix comprising respectively a column of three points (a, b, c) and as shown Figure 2, of five points (d, e, f, g, h).
- the control frame consists of at least three printed drops whose recognition makes it possible to guarantee, with a sufficiently high probability rate, good quality of the printing.
- the distribution of points is as follows: - a drop charged at the minimum voltage; - at least one drop charged at an intermediate voltage; - a drop charged at maximum voltage.
- the tension of the drops is sufficient to allow a significant measurement.
- FIG. 3 is an illustration of such a control frame comprising 15 points, therefore ranging from 1 to 15, the drop (1) being the deflected month and the drop (15) the most deflected.
- This printing of the control frame is for example periodic before each message.
- a conventional recognition device consisting for example of a lighting source, a sensor (CCD) with its optics and associated processing electronics, is provided for reading this control frame.
- the sensor (CCD) is focused on the printed support at the point of impact of the drops. This arrangement makes it possible to read the control frame whether the support is in motion or stopped.
- a synchronization signal allows the capture of the image of the control frame when it arrives on the support.
- control means can measure the distance between the frames, therefore the printing speed which is a function of the speed of the conveyor if the head is fixed, or the speed of the head if the conveyor is fixed. It can thus detect in addition to printing faults, an anomaly in the frame rate.
- the invention applies, as has been said previously, to any industrial marking installation using the inkjet technique.
Abstract
L'invention concerne un procédé de contrôle de la qualité de l'impression d'une imprimante à jet d'encre. Une trame de contrôle est imprimée indépendamment du message de marquage. Cette trame est par exemple constituée de 15 points dont la charge va croissante, de la première à la quinzième goutte. Les distances (G1, G2, G3) séparant respectivement les gouttes (1) et (8), les gouttes (8) et (15) et les gouttes (1) et (15) sont en permanence maintenues pour répondre aux deux relations: G2/G3 = k1 et G2/G3 = k2 sachant que (k1) et (k2) sont des constantes. L'invention s'applique à toutes les installations de marquage par la technique du jet d'encre.The invention relates to a method for controlling the print quality of an inkjet printer. A control frame is printed independently of the marking message. This frame is for example made up of 15 points whose load is increasing, from the first to the fifteenth drop. The distances (G1, G2, G3) separating the drops (1) and (8) respectively, the drops (8) and (15) and the drops (1) and (15) are permanently maintained to respond to the two relationships: G2 / G3 = k1 and G2 / G3 = k2 knowing that (k1) and (k2) are constants. The invention applies to all marking installations using the inkjet technique.
Description
L'invention concerne un procédé de contrôle de l'impression d'une imprimante à jet d'encre.The invention relates to a method for controlling the printing of an inkjet printer.
Les applications de ce type d'imprimante, dans le domaine du marquage industriel notamment, se multiplient régulièrement. On peut citer notamment et à titre purement illustratif, l'impression des dates de fraicheur sur les produits agro-alimentaires ou les numéros de lot. Ces marquages sont de plus en plus réalisés à l'aide d'imprimantes à jet d'encre du type "à jet d'encre continu dévié". Le bon fonctionnement de ces imprimantes est régi par un certain nombre de paramètres relativement complexes et qui doivent être parfaitement maîtrisés si l'on veut obtenir une qualité d'impression irréprochable. Nonobstant les nombreux perfectionnements introduits ces dernières années dans de telles imprimantes, celles-ci ne sont pas à l'abri d'une dérive de l'un ou l'autre des paramètres régissant leur fonctionnement, ce qui peut se traduire par une dégradation de la qualité de l'écriture. Il est d'ailleurs connu que dans la plupart des cas, cette dégradation de la qualité de l'écriture présente une typologie en rapport avec le paramètre défaillant. Par exemple, l'absence d'un impact de gouttes sur le support à imprimer peut signifier que la tête d'impression a besoin d'un nettoyage. De même, à un défaut de positionnement des gouttes peut correspondre une vitesse anormale d'éjection des gouttes ou une vitesse incorrecte du déplacement de la tête. Un autre problème peut également se situer au niveau de la grosseur des gouttes. Par ailleurs, les chaînes de fabrication ou de conditionnement sont de plus en plus automatisées et la permanence de la qualité apparaît comme tout à fait primordiale. Enfin, la fonction de marquage intervenant très souvent en fin de chaîne de production, tout marquage défectueux se traduit par des pertes innacceptables.The applications of this type of printer, in particular in the field of industrial marking, are multiplying regularly. Mention may be made in particular and purely by way of illustration, of the printing of the freshness dates on the agrifood products or the batch numbers. These markings are increasingly carried out using inkjet printers of the "deviated continuous inkjet" type. The proper functioning of these printers is governed by a certain number of relatively complex parameters which must be perfectly mastered if we want to obtain impeccable print quality. Notwithstanding the numerous improvements introduced in recent years in such printers, they are not immune to drift from one or other of the parameters governing their operation, which can result in a degradation of the quality of the writing. It is also known that in most cases, this deterioration in the quality of writing presents a typology related to the faulty parameter. For example, the absence of an impact of drops on the medium to be printed can mean that the print head needs cleaning. Likewise, a faulty positioning of the drops may correspond to an abnormal speed of ejection of the drops or an incorrect speed of movement of the head. Another problem may also lie in the size of the drops. In addition, the production or packaging lines are more and more automated and the permanence of quality appears to be absolutely essential. Finally, since the marking function very often occurs at the end of the production chain, any defective marking results in unacceptable losses.
La présente invention a pour but de résoudre ces problèmes en décrivant un procédé et un dispositif permettant de prévoir l'imminence d'une rupture de la qualité:
- d'identifier la rupture de qualité dans un délai le plus bref possible après son apparition;
- d'arrêter la chaîne de fabrication ou de remplacer la machine de marquage avant qu'il ne soit trop tard.The aim of the present invention is to solve these problems by describing a method and a device making it possible to predict the imminence of a quality break:
- identify the break in quality as soon as possible after its appearance;
- stop the production line or replace the marking machine before it is too late.
L'invention concerne plus précisément un procédé de contrôle de la qualité de l'impression d'une imprimante à jet d'encre caractérisé en ce qu'il consiste:
- à créer une trame de contrôle à des instants et positionnements déterminés du marquage;
- à effectuer la lecture de cette trame de contrôle pour la comparer à une trame de référence.The invention relates more precisely to a method for controlling the print quality of an inkjet printer characterized in that it consists of:
- create a control frame at specific times and positions in the marking;
- reading this control frame to compare it to a reference frame.
L'invention sera mieux comprise à l'aide des explications qui vont suivre et des trois figures jointes qui illustrent schématiquement trois variantes de réalisation d'un dispositif de mise en oeuvre du procédé conforme à l'invention.The invention will be better understood using the explanations which follow and the three attached figures which schematically illustrate three alternative embodiments of a device for implementing the method according to the invention.
Pour plus de clarté, les mêmes éléments portent les mêmes références dans toutes les figures.For the sake of clarity, the same elements are given the same references in all the figures.
Une des caractéristiques du procédé selon l'invention réside dans le fait qu'il consiste d'une part à créer une trame de contrôle spécifique et ceci à des instants et/ou à des positionnements déterminés, et à effectuer d'autre part sa lecture afin de la comparer à une trame de contrôle du même type servant de référence.One of the characteristics of the method according to the invention resides in the fact that it consists, on the one hand, of creating a specific control frame and this at determined times and / or positions, and on the other hand of reading it. in order to compare it to a control frame of the same type serving as a reference.
La trame de contrôle peut être soit autonome, c'est-à-dire indépendante du texte à imprimer, soit liée à l'imprimante ou à d'autres organes de commande de la chaîne. Le motif à vérifier est défini et spécifié au système de contrôle en temps réel.The control frame can be either autonomous, that is to say independent of the text to be printed, or linked to the printer or to other control members of the chain. The reason to be checked is defined and specified in the real-time control system.
Selon une autre caractéristique de l'invention, la trame de contrôle est constituée d'une série de points que l'on peut imprimer soit systématiquement, soit de manière régulière à fréquence fixe, soit de manière régulière à une fréquence résultant d'un processus d'apprentissage en rapport avec les conditions spécifiques d'exploitation. Cette trame de contrôle est donc imprimée en plus du message utile, en général, mais non limitativement, avant celui-ci.According to another characteristic of the invention, the control frame consists of a series of dots which can be printed either systematically, or regularly at a fixed frequency, or regularly at a frequency resulting from a process learning related to specific operating conditions. This control frame is therefore printed in addition to the useful message, in general, but not limited to, before this.
Selon une autre caractéristique de l'invention, la trame de contrôle est définie comme une trame composée d'une succession de points remarquables. Ces points sont positionnés de telle sorte que leur vérification permet de garantir avec une probabilité suffisante que l'impression est correcte. Pour une trame donnée et dans des conditions de fonctionnement normales, la position des différents impacts est parfaitement connue et unique dans une tolérance donnée.According to another characteristic of the invention, the control frame is defined as a frame composed of a succession of remarkable points. These points are positioned so that their verification makes it possible to guarantee with sufficient probability that the printing is correct. For a given frame and under normal operating conditions, the position of the different impacts is perfectly known and unique within a given tolerance.
Si les conditions de fonctionnement de la tête se dégradent (notamment au niveau de la pression de l'encre, de la tension de charge des gouttes, de la tension de déflexion), ceci entraîne une modification de positionnement des différents impacts en dehors des tolérances fixées. Ceci est détecté par un moyen de contrôle, ce qui permet de mettre en évidence un fonctionnement incorrect de la machine d'impression.If the operating conditions of the head deteriorate (in particular at the level of the ink pressure, the charge voltage of the drops, the deflection voltage), this results in a modification of the positioning of the different impacts outside the tolerances fixed. This is detected by a means of control, which makes it possible to highlight an incorrect operation of the printing machine.
Selon une première variante de réalisation du procédé conforme à l'invention, une trame de contrôle est constituée, comme le montre la figure 1, d'une matrice comportant respectivement une colonne de trois points (a,b,c) et comme le montre la figure 2, de cinq points (d,e,f,g,h).According to a first alternative embodiment of the method according to the invention, a control frame consists, as shown in FIG. 1, of a matrix comprising respectively a column of three points (a, b, c) and as shown Figure 2, of five points (d, e, f, g, h).
Dans le premier cas (figure 1), on mesure les variations de la distance (x) séparant les deux points extrêmes et les variations des deux distances (d₁) et (d₂), le point (b) du point (a), et le point (b) du point (c).In the first case (Figure 1), we measure the variations of the distance (x) separating the two extreme points and the variations of the two distances (d₁) and (d₂), point (b) of point (a), and point (b) of point (c).
Dans le second cas, on mesure les variations de la hauteur (z) de la matrice des cinq points et les variations des distances (d₃, d₄, d₅, d₆) entre respectivement le point central (d) et les points (e, f, g, h). Toute dérive de (z) ainsi que des rapports (d₃/d₆) et (d₄/d₅) est significative d'un défaut de fonctionnement.In the second case, we measure the variations of the height (z) of the matrix of the five points and the variations of the distances (d₃, d₄, d₅, d₆) respectively between the central point (d) and the points (e, f , g, h). Any drift from (z) as well as from the ratios (d₃ / d₆) and (d₄ / d₅) is indicative of a malfunction.
Selon une seconde variante de réalisation du procédé conforme à l'invention, la trame de contrôle est constituée d'au moins trois gouttes imprimées dont la reconnaissance permet de garantir avec un taux de probabilité suffisamment élevée, une bonne qualité de l'impression. La répartition des points est la suivante:
- une goutte chargée à la tension minimale;
- au moins une goutte chargée à une tension intermédiaire;
- une goutte chargée à la tension maximale.According to a second alternative embodiment of the method according to the invention, the control frame consists of at least three printed drops whose recognition makes it possible to guarantee, with a sufficiently high probability rate, good quality of the printing. The distribution of points is as follows:
- a drop charged at the minimum voltage;
- at least one drop charged at an intermediate voltage;
- a drop charged at maximum voltage.
La tension des gouttes est suffisante pour permettre une mesure significative.The tension of the drops is sufficient to allow a significant measurement.
La figure 3 est une illustration d'une telle trame de contrôle comportant 15 points, allant donc de 1 à 15, la goutte (1) étant la mois défléchie et la goutte (15) la plus défléchie.FIG. 3 is an illustration of such a control frame comprising 15 points, therefore ranging from 1 to 15, the drop (1) being the deflected month and the drop (15) the most deflected.
Cette impression de la trame de contrôle, comme cela a déjà été dit précédemment, est par exemple périodique avant chaque message. Un dispositif classique de reconnaissance constitué par exemple d'une source d'éclairage, d'un capteur (CCD) avec son optique et d'une électronique de traîtement associés, est prévu pour lire cette trame de controle. Le capteur (CCD) est focalisé sur le support imprimé à l'endroit d'impact des gouttes. Cette disposition permet de faire une lecture de la trame de contrôle que le support soit en mouvement ou à l'arrêt. Dans le premier cas, un signal de synchronisation permet la capture de l'image de la trame de contrôle au moment où celle-ci arrive sur le support.This printing of the control frame, as has already been said previously, is for example periodic before each message. A conventional recognition device consisting for example of a lighting source, a sensor (CCD) with its optics and associated processing electronics, is provided for reading this control frame. The sensor (CCD) is focused on the printed support at the point of impact of the drops. This arrangement makes it possible to read the control frame whether the support is in motion or stopped. In the first case, a synchronization signal allows the capture of the image of the control frame when it arrives on the support.
L'exploitation des résultats permet de vérifier que l'impression de la trame de contrôle est correcte ou non dans les conditions de fonctionnement de la machine.The exploitation of the results makes it possible to verify that the printing of the control frame is correct or not under the operating conditions of the machine.
En utilisation normale, l'opérateur peut ajuster la tension de déflexion des gouttes et faire varier la distance d'impression, ce qui se traduit dans les deux cas par une dilatation de la trame en hauteur. Cependant, la position relative des différentes gouttes est sensiblement conservée si un certain ordre de charge est respecté; par exemple, si les gouttes sont envoyées par ordre croissant de charge. En appliquant cette propriété à la trame de contrôle illustrée au moyen de la figure 3, on obtient les résultats suivants:
G₁ = distance entre impact des gouttes 1 et 8;
G₂ = distance entre impact des gouttes 8 et 15;
G₃ = distance entre impact des gouttes 1 et 15.In normal use, the operator can adjust the deflection tension of the drops and vary the printing distance, which in both cases results in an expansion of the weft in height. However, the relative position of the various drops is appreciably preserved if a certain charge order is respected; for example, if the drops are sent in ascending order of charge. By applying this property to the control frame illustrated by means of FIG. 3, the following results are obtained:
G₁ = distance between impact of
G₂ = distance between impact of
G₃ = distance between impact of
Dans les conditions normales de fonctionnement (vitesse du jet et charge correctes), indépendamment de la valeur de la tension de déflexion (fourchette spécifique) et de la distance d'impression spécifiée, on peut écrire les relations suivantes, à condition de rester dans une fourchette spécifiée:
G₁/G₃ = k₁ et G₂/G₃ = k₂.
(k₁) et (k₂) sont des constantes connues dont les valeurs sont l'image d'une déflexion correcte, donc d'une impression correcte.Under normal operating conditions (jet speed and load correct), regardless of the value of the deflection voltage (specific range) and the specified printing distance, the following relationships can be written, provided that you stay within one specified range:
G₁ / G₃ = k₁ and G₂ / G₃ = k₂.
(k₁) and (k₂) are known constants whose values are the image of a correct deflection, therefore of a correct impression.
Si l'on ajoute à la trame de contrôle précitée, une deuxième trame de contrôle, le moyen de contrôle peut mesurer la distance entre les trames, donc la vitesse d'impression qui est fonction de la vitesse du convoyeur si la tête est fixe, ou la vitesse de la tête si le convoyeur est fixe. Il peut ainsi détecter en plus des défauts d'impression, une anomalie dans la vitesse de défilement.If a second control frame is added to the abovementioned control frame, the control means can measure the distance between the frames, therefore the printing speed which is a function of the speed of the conveyor if the head is fixed, or the speed of the head if the conveyor is fixed. It can thus detect in addition to printing faults, an anomaly in the frame rate.
L'invention s'applique, comme cela a été dit précédemment, à toute installation de marquage industriel mettant en oeuvre la technique du jet d'encre.The invention applies, as has been said previously, to any industrial marking installation using the inkjet technique.
Claims (7)
- a créer une trame de contrôle à des instants et positionnements déterminés du marquage;
- à effectuer la lecture de cette trame de contrôle pour la comparer à une trame de référence. 1. Method for controlling the quality of the printing of an inkjet printer, characterized in that it consists of:
- to create a control frame at determined times and positions of the marking;
- reading this control frame to compare it to a reference frame.
-une goutte chargée à la tension intermédiaire;
-une goutte chargée à la tension maximale. 6. Method according to one of claims 1, 2 and 3, characterized in that it consists in printing a screen comprising at least three drops, the distribution of which is as follows: -a drop charged at the minimum voltage;
-a drop charged at the intermediate voltage;
-a drop charged at maximum voltage.
-d'une part, une trame comportant 1 5 points dont la charge va en ordre croissant, et les distances respectives (G₁, G₂, G₃) soient respectées, G₁ étant la distance entre l'impact des gouttes 1 et 8;
G₂ étant la distance entre l'impact des gouttes 8 et 15,
G₃ étant la distance entre l'impact des gouttes 1 et 15;
- d'autre part, à vérifier que les deux relations:
G₁/G₃ = k₁ et G₂/G₃ = k₂
(k₁ et k₂ étant deux constantes) sont en permanence respectées. 7. Method according to claim 7, characterized in that it consists in printing:
on the one hand, a frame comprising 15 points whose charge goes in increasing order, and the respective distances (G₁, G₂, G₃) are respected, G₁ being the distance between the impact of the drops 1 and 8;
G₂ being the distance between the impact of drops 8 and 15,
G₃ being the distance between the impact of drops 1 and 15;
- on the other hand, to verify that the two relationships:
G₁ / G₃ = k₁ and G₂ / G₃ = k₂
(k₁ and k₂ being two constants) are permanently respected.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8716446A FR2623441B1 (en) | 1987-11-24 | 1987-11-24 | METHOD FOR CONTROLLING THE QUALITY OF THE PRINTING OF AN INK JET PRINTER |
| FR8716446 | 1987-11-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0317777A1 true EP0317777A1 (en) | 1989-05-31 |
| EP0317777B1 EP0317777B1 (en) | 1993-07-28 |
Family
ID=9357229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88117796A Expired - Lifetime EP0317777B1 (en) | 1987-11-24 | 1988-10-26 | Impression quality control process for ink jet printers |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5128691A (en) |
| EP (1) | EP0317777B1 (en) |
| JP (1) | JPH01503529A (en) |
| CA (1) | CA1291365C (en) |
| DE (1) | DE3882657D1 (en) |
| FR (1) | FR2623441B1 (en) |
| WO (1) | WO1989004764A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2740729A1 (en) * | 1995-11-08 | 1997-05-09 | Imaje Sa | METHOD FOR CONTROLLING CHARACTERS PRINTED BY A PRINTER, AND DEVICE FOR CARRYING OUT SAID METHOD |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07264342A (en) * | 1994-03-18 | 1995-10-13 | Ricoh Co Ltd | Facsimile equipment |
| US5956055A (en) * | 1997-10-10 | 1999-09-21 | Lexmark International, Inc. | Method of compensating for skewed printing in an ink jet printer |
| US6106095A (en) * | 1997-10-15 | 2000-08-22 | Pitney Bowes Inc. | Mailing machine having registration of multiple arrays of print elements |
| US6435642B1 (en) | 1998-11-17 | 2002-08-20 | Pitney Bowes Inc. | Apparatus and method for real-time measurement of digital print quality |
| US6350006B1 (en) | 1998-11-17 | 2002-02-26 | Pitney Bowes Inc. | Optical ink drop detection apparatus and method for monitoring operation of an ink jet printhead |
| US6276770B1 (en) | 1998-11-17 | 2001-08-21 | Pitney Bowes Inc. | Mailing machine including ink jet printing having print head malfunction detection |
| US6612676B1 (en) | 1998-11-17 | 2003-09-02 | Pitney Bowes Inc. | Apparatus and method for real-time measurement of digital print quality |
| JP2002172766A (en) * | 2000-09-29 | 2002-06-18 | Brother Ind Ltd | Ink jet printer |
| US6764156B2 (en) * | 2000-12-12 | 2004-07-20 | Xerox Corporation | Head signature correction in a high resolution printer |
| US7543903B2 (en) * | 2004-05-26 | 2009-06-09 | Hewlett-Packard Development Company, L.P. | Image-forming device diagnosis |
| US20060087526A1 (en) * | 2004-10-25 | 2006-04-27 | Pitney Bowes Incorporated | Method and system for monitoring operation of an ink jet print head using a micro-wire array |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2434786A1 (en) * | 1973-08-17 | 1975-02-27 | Ibm | DEVICE FOR DETERMINING THE DISTRACTION OF INK DROPS EMISSED FROM THE DUESE OF AN INKJET PRINTER |
| EP0036787A1 (en) * | 1980-03-26 | 1981-09-30 | Cambridge Consultants Limited | Liquid jet printing apparatus |
| WO1982001415A1 (en) * | 1980-10-16 | 1982-04-29 | Ncr Co | Dot matrix printer |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3992713A (en) * | 1975-06-20 | 1976-11-16 | International Business Machines Corporation | Ink jet printing system with pedestal synchronization |
| US4675696A (en) * | 1982-04-07 | 1987-06-23 | Canon Kabushiki Kaisha | Recording apparatus |
| JPS6298475A (en) * | 1985-10-25 | 1987-05-07 | Hitachi Ltd | Inspecting method for printer quality |
| US4800396A (en) * | 1987-07-08 | 1989-01-24 | Hertz Carl H | Compensation method and device for ink droplet deviation of an ink jet |
-
1987
- 1987-11-24 FR FR8716446A patent/FR2623441B1/en not_active Expired - Lifetime
-
1988
- 1988-10-25 JP JP63509056A patent/JPH01503529A/en active Pending
- 1988-10-25 WO PCT/FR1988/000523 patent/WO1989004764A1/en unknown
- 1988-10-25 US US07/397,449 patent/US5128691A/en not_active Expired - Fee Related
- 1988-10-26 DE DE8888117796T patent/DE3882657D1/en not_active Expired - Lifetime
- 1988-10-26 EP EP88117796A patent/EP0317777B1/en not_active Expired - Lifetime
- 1988-11-21 CA CA000583624A patent/CA1291365C/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2434786A1 (en) * | 1973-08-17 | 1975-02-27 | Ibm | DEVICE FOR DETERMINING THE DISTRACTION OF INK DROPS EMISSED FROM THE DUESE OF AN INKJET PRINTER |
| EP0036787A1 (en) * | 1980-03-26 | 1981-09-30 | Cambridge Consultants Limited | Liquid jet printing apparatus |
| WO1982001415A1 (en) * | 1980-10-16 | 1982-04-29 | Ncr Co | Dot matrix printer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2740729A1 (en) * | 1995-11-08 | 1997-05-09 | Imaje Sa | METHOD FOR CONTROLLING CHARACTERS PRINTED BY A PRINTER, AND DEVICE FOR CARRYING OUT SAID METHOD |
| EP0773513A1 (en) * | 1995-11-08 | 1997-05-14 | Imaje S.A. | Method and apparatus for controlling printing quality |
Also Published As
| Publication number | Publication date |
|---|---|
| US5128691A (en) | 1992-07-07 |
| FR2623441A1 (en) | 1989-05-26 |
| WO1989004764A1 (en) | 1989-06-01 |
| EP0317777B1 (en) | 1993-07-28 |
| JPH01503529A (en) | 1989-11-30 |
| DE3882657D1 (en) | 1993-09-02 |
| CA1291365C (en) | 1991-10-29 |
| FR2623441B1 (en) | 1990-03-02 |
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