EP0893380A1 - Printer for office machines with improved image centring - Google Patents

Printer for office machines with improved image centring Download PDF

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Publication number
EP0893380A1
EP0893380A1 EP98401633A EP98401633A EP0893380A1 EP 0893380 A1 EP0893380 A1 EP 0893380A1 EP 98401633 A EP98401633 A EP 98401633A EP 98401633 A EP98401633 A EP 98401633A EP 0893380 A1 EP0893380 A1 EP 0893380A1
Authority
EP
European Patent Office
Prior art keywords
sheet
printer
cropping
printing
sensors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98401633A
Other languages
German (de)
French (fr)
Other versions
EP0893380B1 (en
Inventor
Eric Cavarero
Pascal Boishardy
Jacques Leroy
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.)
Sagem SA
Original Assignee
Sagem SA
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Filing date
Publication date
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Publication of EP0893380A1 publication Critical patent/EP0893380A1/en
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Publication of EP0893380B1 publication Critical patent/EP0893380B1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H9/00Registering, e.g. orientating, articles; Devices therefor
    • B65H9/002Registering, e.g. orientating, articles; Devices therefor changing orientation of sheet by only controlling movement of the forwarding means, i.e. without the use of stop or register wall
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H7/00Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/02Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
    • B65H7/06Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed
    • B65H7/08Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed responsive to incorrect front register
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/20Location in space
    • B65H2511/24Irregularities, e.g. in orientation or skewness
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/40Identification
    • B65H2511/413Identification of image
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00Dynamic entities; Timing aspects
    • B65H2513/10Speed
    • B65H2513/11Speed angular

Definitions

  • the classic way to control the framing is to guide as input the inserted sheet, to align it correctly, and at the enter to release it only after printing is complete.
  • Stepper motors allow controlled back-and-forth of the sheet to successively press it with adhesion on three respective color ranges of a transfer ribbon thermal, by rollers of a rolling mill which entrain by rubbing the whole scrolling in front of the print head.
  • the input guide is imprecise and the framing initial is therefore uncertain.
  • the framing drifts during maneuvers. Indeed, the sheet, driven by friction by the pebbles, may slide slightly in relation to the tape, possibly skewing if the rollers have the less asymmetry, so that its return position is imprecise and also unfaithful because this imprecision grows with each pass.
  • the solution consisting in spreading and fixing the sheet on a drum with one direction of rotation, to perform successively the three printing passes is very restrictive in volume.
  • the present invention aims to remove the uncertainty of positioning of the image, obtained by one or more passes printing, on a printing medium.
  • the invention relates to a printer for office machine comprising means for introducing and guiding of sheets to be printed arranged to cooperate with means for jointly driving a sheet and a ribbon inkpad in front of a print head, by transfer from the ribbon, arranged to receive an electronic image to be printed, characterized by the fact that it includes means for detecting the difference in position of the sheet to be printed with respect to a predetermined position, arranged to control accordingly means for relative cropping of the sheet and of the image electronic.
  • the concept of the invention can be described as dynamic positioning between the sheet and the image to be printed, this which avoids all the technical uncertainties and constraints linked to a permanent sheet maintenance within tight tolerances of position.
  • Cropping can be mechanical, between the sheet and the block printing, or electronic by translation and / or rotation of the image to print.
  • the represented printer comprises, in the direction of travel of the sheets 10 to be printed, a slide 1 to lateral guide edges of sheets 10 of blank paper with, in manhole, a support 2, rotatable around an axis 3, of a pair of rollers or drive rollers 4 of the sheet 10, arranged symmetrically with respect to the longitudinal axis of the sheet 10.
  • the rollers 4 are opposed to a fixed axis freewheel roller 5 disposed downstream of the slide 1 and comprising an outer layer of rubber with high coefficient of friction. It is also planned a motorized central roller or roller 55, opposite the roller 5, for the introduction of the sheets 10, by limited friction.
  • the set of axes indicated is perpendicular to the plane of the figure, that is to say parallel to the front edge of a sheet 10 printed.
  • the various drive motors have not been represented.
  • Two opposite guide slides 6 are arranged downstream of the rollers 4, 5, 55 and leads to two stops for positioning in the form of retractable articulated hooks 7, 8, rotatably mounted on an axis 9. Slightly upstream of the stops 7, 8 is arranged a position sensor 12 of a lateral edge of the sheet 10, behind the cutting plane.
  • the guide 6 Downstream of the stops 7, 8, the guide 6 continues with a channel 13 leading to a printing block comprising a head printing 14 controlled by an electronic image memory 16 (three partial three-color images) to which a circuit has access 17 image cropping, belonging to a central unit in microprocessor 18.
  • an electronic image memory 16 three partial three-color images
  • a tributary channel 23 opens upstream of the head 14 to the passage of an ink ribbon 20, here by thermal transfer, or by sublimation, originating from a supply roller 21 and leading to a take-up roller 22.
  • An exhaust channel 24 for the sheet 10 and the tape 20 branches off into a channel 25 for ejecting the printed sheet 10 and into a channel 26 for accessing the take-up roller 22.
  • Figure 2 is shown a first variant in which the stops 7 and 8 have been replaced by sensors 37 and 38 of point position of edge of sheet 10, shown very schematically, arranged at a distance from each other according to the expected direction of the anterior edge 101 of the sheet 10, therefore transverse to the direction 11 of advance of the sheet 10.
  • the sensor 12 side edge 102 of sheet 10 has a row of cells punctuals extending transversely to the direction of advance 11 long enough to cover the uncertainty range of position of the lateral edge 102.
  • the representation of the position is only functional.
  • printer's sensors and motors are connected to the central unit 18, which manages the cropping operations and printing.
  • the cropping means of the sheet 10 comprise two motors 31, 32 driving, by respective gears 33, 34, two rollers or rollers 35, 36 for driving the sheet 10, referenced overall 4 in Figure 1.
  • the rollers 35, 36 mutually independent, are here aligned along an axis 30 transverse to the direction of advance 11 of the sheet 10, that is to say perpendicular to the plan of FIG. 1.
  • cropping, between sheet 10 and the electronic image, in the transverse direction, parallel to the front edge 101 is effected by a corresponding translation of the electronic image and therefore here without mechanical action on the sheet 10.
  • a motor 41 here rotates a screw 47, substantially parallel to the direction 11, cooperating with a nut 49 secured, in an articulated manner, to one end of an axis rod 40 common to rollers 35 and 36, rod 40 pivoting at the motor 42.
  • the anterior edge 101 activates only one of the sensors 37, 38 first, so that the unit central 18 deduces the sign of the edge misalignment angle anterior 101 with respect to the direction transverse to the direction in advance 11.
  • the sheet 10 being rectangular, the angle between the edge lateral 102 and the direction 11 is also equal to that determined above.
  • Sheet 10 can be viewed like an image whose position is determined in the printer to superimpose the image to be printed on it.
  • the cropping circuit 17 of the central unit 18 controls then the motor 31 or 32 opposite the activated sensor 37, 38, in order to rotate the sheet 10 in its plane, with possible retraction, until that the two sensors 37, 38 simultaneously detect the arrival of the front edge 101, thus aligned correctly.
  • the sensor 12 of position of a point of the lateral edge 102, then aligned with the direction in advance 11, provides the transverse position of the edge 102 of the sheet 10.
  • the circuit 17 thus deduces therefrom the difference between this lateral position measured and a lateral reference position, in memory, and therefore determines the crop needed.
  • the sheet 10 is positioned as desired, predetermined, relative to the head printing 14 and any framing error is thus excluded.
  • the error or framing difference between the sheet 10 and head 14 is measured and the correction is made by processing (17) of the image (16), that is to say here a translation lateral.
  • the print head 14 has a length sufficient to print the full width of an image, regardless of the offset side of sheet 10.
  • the rod 40 is pivoted, at level of the motor 42, by translation of the nut 49 controlled by the screw 47, which, by friction of the rollers 35 and 36 on the sheet 10, makes rotate it in its plane, until it aligns as expected.
  • the sheet feed rolling mill in differential, translating one of its sides.
  • the support 2 pivots (dotted line) to pinch strongly sheet 10 between rollers 4 and 5 and drive it in front the print head 14, the stops 7, 8 present in the case of the Figure 1 having been retracted by pivoting in their position retracted (dotted line).
  • the unit central 18 releases the rollers 4 by pivoting the support 2. Printing then takes place and the printed sheet 10 is ejected (25), in a tray not shown, then the roller 19 stops.
  • the pass impression above corresponded to the impression of one of the three colors, cyan, magenta, yellow, of range of the ribbon 20.
  • This one has suites of three slightly larger format tracks to that of the sheets 10 and, during the first pass, the ribbon 20 was advanced to permanently compare the transverse line sheet 10 being printed and a corresponding strip of the range of the color considered.
  • the excess format of ranges excludes any problem of framing sheet 10 / zone of ribbon 20.
  • sheet 10 ejected is manually reinserted twice into the printer.
  • Guidance can also be provided to reintroduce, automatically by looping, twice sheet 10, before eject it.
  • a leaf recoil mechanism 10 partially print can also be provided to bring it back to the area position sensors.
  • three point sensors are sufficient to determine the position of the sheet according to two edges of non-parallel reference, therefore adjacent in the case of a sheet parallelepiped.
  • Two mutually spaced sensors determine the orientation and position of a reference edge transverse 101 or lateral 102 and the third sensor determines the position of the other edge, lateral or transverse.
  • the correction for cropping corresponding to the three degrees of freedom mentioned above, two degrees of freedom in translation, a degree of freedom in rotation, can be performed, in all or part, by mechanical means of cropping the sheet 10 relative to head 14, or of the latter, then movable, by compared to sheet 10, respectively electronic means of displacement of the electronic image according to these three degrees of freedom, since the printer has such a memory 16. Otherwise, only a transverse shift, over the water, is possible in the printer itself.

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  • Handling Of Sheets (AREA)
  • Electronic Switches (AREA)
  • Handling Of Cut Paper (AREA)

Abstract

Sensors (37,38,12) for detection of the difference in position of a sheet of paper (10) with respect to a predetermined position are configured to realign the sheet (10) relative to the electronic image, which is to be printed, using the various rollers (31-36) and positioning devices to achieve this. A central control unit and re-alignment circuit are used to control the roller driver motors.

Description

Dans une imprimante, il faut pouvoir contrôler la position des feuilles de papier à imprimer, afin de respecter le cadrage souhaité pour l'impression.In a printer, you must be able to control the position sheets of paper to print, to respect the framing desired for printing.

Si l'on prend l'exemple particulier à l'origine de la présente invention, mais qui ne doit pas limiter la portée de la présente demande, il s'agissait d'une imprimante couleur à transfert thermique d'une machine de bureau.If we take the particular example at the origin of this invention but which should not limit the scope of this request, it was a color transfer printer thermal of an office machine.

Dans une telle imprimante, on effectue trois passes d'impression partielle, pour les trois couleurs fondamentales respectives, cyan, magenta et jaune, à imprimer sur une feuille.In such a printer, three passes are made partial printing, for the three basic colors respective, cyan, magenta and yellow, to be printed on a sheet.

De ce fait, il faut tout d'abord, comme dans toute imprimante, cadrer initialement la feuille par rapport à la tête d'impression et il faut, en outre, conserver le cadrage tout au long des passes d'impression.Therefore, first of all, as in all printer, initially align the sheet with respect to the head printing and you must also keep the framing throughout printing passes.

La façon classique de contrôler le cadrage consiste à guider en entrée la feuille introduite, pour l'aligner correctement, et à la saisir pour ne la relâcher qu'une fois les impressions achevées.The classic way to control the framing is to guide as input the inserted sheet, to align it correctly, and at the enter to release it only after printing is complete.

Des moteurs pas à pas permettent un va-et-vient contrôlé de la feuille pour successivement la plaquer avec adhérence sur trois plages de couleurs respectives d'un ruban de transfert thermique, par des galets d'un laminoir qui entraínent par frottement l'ensemble en défilement devant la tête d'impression.Stepper motors allow controlled back-and-forth of the sheet to successively press it with adhesion on three respective color ranges of a transfer ribbon thermal, by rollers of a rolling mill which entrain by rubbing the whole scrolling in front of the print head.

Cependant, le guidage d'entrée est imprécis et le cadrage initial est donc incertain. En outre le cadrage dérive au cours des manoeuvres. En effet, la feuille, entraínée par frottement par les galets, est susceptible de glisser légèrement par rapport au ruban, en se mettant éventuellement de travers si les galets présentent la moindre dissymétrie, si bien que sa position de retour est imprécise et en outre infidèle car cette imprécision croít à chaque passe.However, the input guide is imprecise and the framing initial is therefore uncertain. In addition, the framing drifts during maneuvers. Indeed, the sheet, driven by friction by the pebbles, may slide slightly in relation to the tape, possibly skewing if the rollers have the less asymmetry, so that its return position is imprecise and also unfaithful because this imprecision grows with each pass.

La solution consistant à étendre et fixer la feuille sur un tambour à sens de rotation unique, pour effectuer successivement les trois passes d'impression est très contraignante en volume.The solution consisting in spreading and fixing the sheet on a drum with one direction of rotation, to perform successively the three printing passes is very restrictive in volume.

La présente invention vise à supprimer l'incertitude de positionnement de l'image, obtenue par une ou plusieurs passes d'impression, sur un support d'impression.The present invention aims to remove the uncertainty of positioning of the image, obtained by one or more passes printing, on a printing medium.

A cet effet, l'invention concerne une imprimante pour machine de bureau comportant des moyens d'introduction et de guidage de feuilles à imprimer agencés pour coopérer avec des moyens d'entraínement en commun d'une feuille et d'un ruban encreur devant une tête d'impression, par transfert depuis le ruban, agencée pour recevoir une image électronique à imprimer, caractérisée par le fait qu'elle comporte des moyens de détection de l'écart de position de la feuille à imprimer par rapport à une position prédéterminée, agencés pour commander en conséquence des moyens de recadrage relatif de la feuille et de l'image électronique.To this end, the invention relates to a printer for office machine comprising means for introducing and guiding of sheets to be printed arranged to cooperate with means for jointly driving a sheet and a ribbon inkpad in front of a print head, by transfer from the ribbon, arranged to receive an electronic image to be printed, characterized by the fact that it includes means for detecting the difference in position of the sheet to be printed with respect to a predetermined position, arranged to control accordingly means for relative cropping of the sheet and of the image electronic.

Ainsi, le concept de l'invention peut être qualifié de positionnement dynamique entre la feuille et l'image à imprimer, ce qui évite toutes les incertitudes et contraintes techniques liées à un maintien permanent de la feuille dans des tolérances étroites de position.Thus, the concept of the invention can be described as dynamic positioning between the sheet and the image to be printed, this which avoids all the technical uncertainties and constraints linked to a permanent sheet maintenance within tight tolerances of position.

Le recadrage peut être mécanique, entre la feuille et le bloc d'impression, ou bien électronique par translation et/ou rotation de l'image à imprimer. Cropping can be mechanical, between the sheet and the block printing, or electronic by translation and / or rotation of the image to print.

Pour une impression en plusieurs passes, comme pour la couleur, on peut ainsi ramener manuellement ou mécaniquement la feuille à sa position de départ, sans précaution spécifique.For multi-pass printing, such as for color, you can manually or mechanically bring the sheet in its starting position, without specific precautions.

L'invention sera mieux comprise à l'aide de la description suivante d'une forme de réalisation préférée d'une imprimante couleur selon l'invention, en référence au dessin annexé, sur lequel :

  • la figure 1 est une coupe latérale schématique de l'imprimante,
  • la figure 2 représente schématiquement en perspective des capteurs de position d'une feuille à imprimer et un dispositif de recadrage de celle-ci, et
  • la figure 3 représente, aussi en perspective, une variante du dispositif de recadrage de la figure 2.
The invention will be better understood using the following description of a preferred embodiment of a color printer according to the invention, with reference to the attached drawing, in which:
  • FIG. 1 is a schematic side section of the printer,
  • FIG. 2 schematically represents in perspective the position sensors of a sheet to be printed and a device for cropping the latter, and
  • FIG. 3 represents, also in perspective, a variant of the cropping device of FIG. 2.

L'imprimante représentée, de type couleur, comporte, dans le sens de cheminement des feuilles 10 à imprimer, une glissière 1 à bords de guidage latéral de feuilles 10 de papier vierge avec, en regard, un support 2, rotatif autour d'un axe 3, d'une paire de rouleaux ou galets d'entraínement 4 de la feuille 10, disposés symétriquement par rapport à l'axe longitudinal de la feuille 10. Les galets 4 sont opposés à un rouleau de roue libre à axe fixe 5 disposé en aval de la glissière 1 et comportant une couche externe de caoutchouc à coefficient de frottement élevé. Il est en outre prévu un rouleau ou galet central 55 motorisé, opposé au rouleau 5, pour l'introduction des feuilles 10, par frottement limité.The represented printer, of color type, comprises, in the direction of travel of the sheets 10 to be printed, a slide 1 to lateral guide edges of sheets 10 of blank paper with, in manhole, a support 2, rotatable around an axis 3, of a pair of rollers or drive rollers 4 of the sheet 10, arranged symmetrically with respect to the longitudinal axis of the sheet 10. The rollers 4 are opposed to a fixed axis freewheel roller 5 disposed downstream of the slide 1 and comprising an outer layer of rubber with high coefficient of friction. It is also planned a motorized central roller or roller 55, opposite the roller 5, for the introduction of the sheets 10, by limited friction.

L'ensemble des axes indiqués est perpendiculaire au plan de la figure, c'est-à-dire parallèle au bord antérieur d'une feuille 10 imprimée. Les divers moteurs d'entraínement n'ont pas été représentés. Deux glissières opposées de guidage 6 sont disposées en aval des rouleaux 4, 5, 55 et aboutit à deux butées de positionnement en forme de crochets articulés rétractables 7, 8, montés rotatifs sur un axe 9. Légèrement en amont des butées 7, 8 est disposé un capteur 12 de position d'un bord latéral de la feuille 10, derrière le plan de coupe.The set of axes indicated is perpendicular to the plane of the figure, that is to say parallel to the front edge of a sheet 10 printed. The various drive motors have not been represented. Two opposite guide slides 6 are arranged downstream of the rollers 4, 5, 55 and leads to two stops for positioning in the form of retractable articulated hooks 7, 8, rotatably mounted on an axis 9. Slightly upstream of the stops 7, 8 is arranged a position sensor 12 of a lateral edge of the sheet 10, behind the cutting plane.

En aval des butées 7, 8, le guidage 6 se poursuit par un canal 13 aboutissant à un bloc d'impression comportant une tête d'impression 14 commandée par une mémoire d'image électronique 16 (trois images partielles de trichromie) à laquelle a accès un circuit 17 de recadrage de l'image, appartenant à une unité centrale à microprocesseur 18.Downstream of the stops 7, 8, the guide 6 continues with a channel 13 leading to a printing block comprising a head printing 14 controlled by an electronic image memory 16 (three partial three-color images) to which a circuit has access 17 image cropping, belonging to a central unit in microprocessor 18.

Un rouleau moteur de contre-appui 19, avec couche de caoutchouc à coefficient de frottement élevé, est disposé en regard de la tête 14, qui est plaquée sur celui-ci par un ressort de rappel 15.A backing drive roller 19, with a layer of rubber with a high coefficient of friction, is arranged opposite of the head 14, which is pressed thereon by a return spring 15.

Un canal affluent 23 débouche en amont de la tête 14 pour le passage d'un ruban encreur 20, ici par transfert thermique, ou par sublimation, provenant d'un rouleau débiteur 21 et aboutissant à un rouleau récepteur 22.A tributary channel 23 opens upstream of the head 14 to the passage of an ink ribbon 20, here by thermal transfer, or by sublimation, originating from a supply roller 21 and leading to a take-up roller 22.

Un canal 24 d'échappement de la feuille 10 et du ruban 20 bifurque en un canal 25 d'éjection de la feuille 10 imprimée et en un canal 26 d'accès au rouleau récepteur 22.An exhaust channel 24 for the sheet 10 and the tape 20 branches off into a channel 25 for ejecting the printed sheet 10 and into a channel 26 for accessing the take-up roller 22.

Sur la figure 2 est représentée une première variante dans laquelle les butées 7 et 8 ont été remplacées par des capteurs 37 et 38 de position ponctuelle de bord de feuille 10, représentés très schématiquement, disposés à distance l'un de l'autre selon la direction prévue du bord antérieur 101 de la feuille 10, donc transversale à la direction 11 d'avance de la feuille 10. Le capteur 12 du bord latéral 102 de la feuille 10 comporte une rangée de cellules ponctuelles s'étendant transversalement à la direction d'avance 11 sur une longueur suffisante pour couvrir la plage d'incertitude de position du bord latéral 102. La représentation des capteurs de position n'est que fonctionnelle. In Figure 2 is shown a first variant in which the stops 7 and 8 have been replaced by sensors 37 and 38 of point position of edge of sheet 10, shown very schematically, arranged at a distance from each other according to the expected direction of the anterior edge 101 of the sheet 10, therefore transverse to the direction 11 of advance of the sheet 10. The sensor 12 side edge 102 of sheet 10 has a row of cells punctuals extending transversely to the direction of advance 11 long enough to cover the uncertainty range of position of the lateral edge 102. The representation of the position is only functional.

L'ensemble des capteurs et moteurs de l'imprimante est relié à l'unité centrale 18, qui gère les opérations de recadrage et d'impression.All of the printer's sensors and motors are connected to the central unit 18, which manages the cropping operations and printing.

Les moyens de recadrage de la feuille 10 comportent deux moteurs 31, 32 entraínant, par des engrenages respectifs 33, 34, deux rouleaux ou galets 35, 36 d'entraínement de la feuille 10, référencés globalement 4 sur la figure 1. Les galets 35, 36, mutuellement indépendants, sont ici alignés selon un axe 30 transversal à la direction d'avance 11 de la feuille 10, c'est-à-dire perpendiculaire au plan de la figure 1. D'une façon générale, il peut être prévu des rouleaux en nombre et orientations telles que la feuille 10 puisse être translatée, selon la direction d'avance 11 et perpendiculairement à celle-ci, et qu'on puisse aussi la faire tourner dans son plan. Dans cet exemple, le recadrage, entre la feuille 10 et l'image électronique, selon la direction transversale, parallèle au bord antérieur 101, est effectué par une translation correspondante de l'image électronique et donc ici sans action mécanique sur la feuille 10.The cropping means of the sheet 10 comprise two motors 31, 32 driving, by respective gears 33, 34, two rollers or rollers 35, 36 for driving the sheet 10, referenced overall 4 in Figure 1. The rollers 35, 36, mutually independent, are here aligned along an axis 30 transverse to the direction of advance 11 of the sheet 10, that is to say perpendicular to the plan of FIG. 1. In general, provision may be made for rolls in number and orientations such that sheet 10 can be translated, according to the direction of advance 11 and perpendicular to it, and you can also rotate it in his plan. In this example, cropping, between sheet 10 and the electronic image, in the transverse direction, parallel to the front edge 101, is effected by a corresponding translation of the electronic image and therefore here without mechanical action on the sheet 10.

Dans la variante de la figure 3, où les éléments homologues de ceux de la figure 2 ont conservé leur référence, le moteur 32 a été remplacé par un moteur 42 d'avance feuille de l'imprimante (laminoir d'entrée).In the variant of Figure 3, where the homologous elements of those of FIG. 2 have kept their reference, the motor 32 has been replaced by a 42 sheet printer advance motor (entrance rolling mill).

Un moteur 41 entraíne ici en rotation une vis 47, sensiblement parallèle à la direction 11, coopérant avec un écrou 49 solidaire, de façon articulée, d'une extrémité d'une tige d'axe 40 commune aux galets 35 et 36, tige 40 pivotant au niveau du moteur 42.A motor 41 here rotates a screw 47, substantially parallel to the direction 11, cooperating with a nut 49 secured, in an articulated manner, to one end of an axis rod 40 common to rollers 35 and 36, rod 40 pivoting at the motor 42.

Le fonctionnement de l'imprimante va maintenant être expliqué plus en détails. The operation of the printer will now be explained in more detail.

Une feuille 10 étant introduite dans l'imprimante sur la glissière 1, le galet central 55 l'entraíne par léger frottement jusqu'au contact de l'une des butées 7, 8, et, comme la force d'entraínement du galet central 55 passe entre les deux butées 7 et 8, elle produit un couple de rotation venant appliquer la feuille 10 sur l'autre butée 7, 8. La feuille 10 est ainsi alignée correctement. Le support 2 est alors dans une position écartée (trait plein) qui interdit le contact entre les galets 4 et la feuille 10. A la place du galet 55, il aurait encore pu être prévu une position intermédiaire, d'appui limité, des galets 4.A sheet 10 being introduced into the printer on the slide 1, the central roller 55 drives it by slight friction until contact of one of the stops 7, 8, and, as the driving force of the central roller 55 passes between the two stops 7 and 8, it produces a torque from applying the sheet 10 to the other stop 7, 8. The sheet 10 is thus aligned correctly. Support 2 is then in an open position (solid line) which prevents contact between the pebbles 4 and sheet 10. Instead of pebble 55, it could still have been provided an intermediate position, limited support, rollers 4.

Dans le cas des variantes des figures 2 et 3, si la feuille 10 est orientée de façon incorrecte dans son plan, le bord antérieur 101 active en premier un seul des capteurs 37, 38, si bien que l'unité centrale 18 en déduit le signe de l'angle de désalignement du bord antérieur 101 par rapport à la direction transversale à la direction d'avance 11. La feuille 10 étant rectangulaire, l'angle entre le bord latéral 102 et la direction 11 est aussi égal à celui déterminé ci-dessus.In the case of variants of Figures 2 and 3, if the sheet 10 is oriented incorrectly in its plane, the anterior edge 101 activates only one of the sensors 37, 38 first, so that the unit central 18 deduces the sign of the edge misalignment angle anterior 101 with respect to the direction transverse to the direction in advance 11. The sheet 10 being rectangular, the angle between the edge lateral 102 and the direction 11 is also equal to that determined above.

On conçoit que, dans le cas de la figure 1, il aurait pu être prévu une seule butée (7; 8), à seule fonction mécanique, associée à, globalement, un capteur d'orientation du bord antérieur 101 (ou latéral 102), c'est-à-dire déterminant l'avance (11) relative de deux points espacés du bord antérieur 101, comme dans le cas des figures 2 et 3. De même, si l'on peut prévoir d'intégrer des capteurs de position (37, 38) du bord antérieur 101 de la feuille 10 dans les butées 7, 8, la fonction de butée peut cependant être remplacée par un contrôle de l'avance de la feuille 10 par le galet 55, de façon à arrêter cette avance lorsque le bord antérieur 101 atteint la zone d'action des capteurs de position 37, 38.We can see that, in the case of Figure 1, it could have been provided with a single stop (7; 8), with a single mechanical function, associated with, overall, an anterior edge orientation sensor 101 (or lateral 102), that is to say determining the relative advance (11) of two points spaced from the anterior edge 101, as in the case of the figures 2 and 3. Likewise, if provision can be made for integrating position (37, 38) of the front edge 101 of the sheet 10 in the stops 7, 8, the stop function can however be replaced by a control of the advance of the sheet 10 by the roller 55, so as to stop this advance when the front edge 101 reaches the zone of the position sensors 37, 38.

Comme expliqué plus loin, on réoriente la feuille 10, si besoin est, et elle ne peut franchir les deux capteurs 37, 38 que si elle les fait commuter simultanément. La feuille 10 peut être considérée comme une image dont on détermine la position dans l'imprimante pour y superposer l'image à imprimer.As explained below, we redirect sheet 10, if need is, and it can only pass the two sensors 37, 38 if it causes them to switch simultaneously. Sheet 10 can be viewed like an image whose position is determined in the printer to superimpose the image to be printed on it.

Le circuit de recadrage 17 de l'unité centrale 18 commande ensuite le moteur 31 ou 32 opposé au capteur 37, 38 activé, afin de faire pivoter la feuille 10 dans son plan, avec recul éventuel, jusqu'à ce que les deux capteurs 37, 38 détectent simultanément l'arrivée du bord antérieur 101, ainsi aligné correctement. Le capteur 12 de position d'un point du bord latéral 102, alors aligné sur la direction d'avance 11, fournit la position transversale du bord 102 de la feuille 10. Le circuit 17 en déduit ainsi l'écart entre cette position latérale mesurée et une position latérale de référence, en mémoire, et donc détermine le recadrage nécessaire.The cropping circuit 17 of the central unit 18 controls then the motor 31 or 32 opposite the activated sensor 37, 38, in order to rotate the sheet 10 in its plane, with possible retraction, until that the two sensors 37, 38 simultaneously detect the arrival of the front edge 101, thus aligned correctly. The sensor 12 of position of a point of the lateral edge 102, then aligned with the direction in advance 11, provides the transverse position of the edge 102 of the sheet 10. The circuit 17 thus deduces therefrom the difference between this lateral position measured and a lateral reference position, in memory, and therefore determines the crop needed.

Ainsi, dans la direction d'avance 11, la feuille 10 est positionnée de la façon voulue, prédéterminée, par rapport à la tête d'impression 14 et toute erreur de cadrage est ainsi exclue. Dans la direction transversale 101, l'erreur ou écart de cadrage entre la feuille 10 et la tête 14 est mesurée et la correction intervient par traitement (17) de l'image (16), c'est-à-dire ici une translation latérale. La tête d'impression 14 a une longueur suffisante pour imprimer toute la largeur d'une image, quel que soit le décalage latéral de la feuille 10.Thus, in the direction of advance 11, the sheet 10 is positioned as desired, predetermined, relative to the head printing 14 and any framing error is thus excluded. In the transverse direction 101, the error or framing difference between the sheet 10 and head 14 is measured and the correction is made by processing (17) of the image (16), that is to say here a translation lateral. The print head 14 has a length sufficient to print the full width of an image, regardless of the offset side of sheet 10.

Dans la variante de la figure 3, on fait pivoter la tige 40, au niveau du moteur 42, par translation de l'écrou 49 commandé par la vis 47, ce qui, par frottement des galets 35 et 36 sur la feuille 10, fait tourner celle-ci dans son plan, jusqu'à l'aligner comme prévu. On utilise ainsi en différentiel le laminoir d'avance feuille, en translatant l'un de ses côtés.In the variant of FIG. 3, the rod 40 is pivoted, at level of the motor 42, by translation of the nut 49 controlled by the screw 47, which, by friction of the rollers 35 and 36 on the sheet 10, makes rotate it in its plane, until it aligns as expected. We thus uses the sheet feed rolling mill in differential, translating one of its sides.

La position de la feuille 10 étant ainsi parfaitement déterminée, le support 2 pivote (trait en pointillés) pour pincer fortement la feuille 10 entre les rouleaux 4 et 5 et l'entraíner devant la tête d'impression 14, les butées 7, 8 présentes dans le cas de la figure 1 ayant été escamotées par pivotement dans leur position rétractée (trait en pointillés).The position of the sheet 10 thus being perfectly determined, the support 2 pivots (dotted line) to pinch strongly sheet 10 between rollers 4 and 5 and drive it in front the print head 14, the stops 7, 8 present in the case of the Figure 1 having been retracted by pivoting in their position retracted (dotted line).

Le rouleau de contre-appui 19, tournant, sous la commande d'un moteur pas à pas, à vitesse linéaire légèrement plus élevée que celle des rouleaux 4, 5, commence par saisir le bord antérieur 101 et tend longitudinalement la feuille 10 tout en entraínant le ruban 20, plaqué sur la feuille 10.The backing roller 19, rotating, under the stepper motor control, at slightly higher linear speed higher than that of rollers 4, 5, begins by grasping the edge front 101 and longitudinally stretches the sheet 10 while driving the ribbon 20, plated on the sheet 10.

Après un engagement déterminé (marge supérieure) de la feuille 10 au niveau du rouleau 19 (nombre de pas moteur), l'unité centrale 18 dégage les galets 4 par pivotement du support 2. L'impression intervient alors et la feuille imprimée 10 est éjectée (25), dans un bac non représenté, puis le rouleau 19 s'arrête.After a specific commitment (upper margin) of the sheet 10 at roller 19 (number of motor steps), the unit central 18 releases the rollers 4 by pivoting the support 2. Printing then takes place and the printed sheet 10 is ejected (25), in a tray not shown, then the roller 19 stops.

Dans cet exemple d'imprimante couleur, la passe d'impression ci-dessus correspondait à l'impression de l'une des trois couleurs, cyan, magenta, jaune, de plage du ruban 20. Celui-ci comporte des suites de trois plages de format légèrement supérieur à celui des feuilles 10 et, lors de la première passe, le ruban 20 a été avancé pour mettre en regard en permanence la ligne transversale de la feuille 10 en cours d'impression et une bande correspondante de la plage de la couleur considérée. L'excédent de format des plages exclut tout problème de cadrage feuille 10/ zone du ruban 20.In this example color printer, the pass impression above corresponded to the impression of one of the three colors, cyan, magenta, yellow, of range of the ribbon 20. This one has suites of three slightly larger format tracks to that of the sheets 10 and, during the first pass, the ribbon 20 was advanced to permanently compare the transverse line sheet 10 being printed and a corresponding strip of the range of the color considered. The excess format of ranges excludes any problem of framing sheet 10 / zone of ribbon 20.

Pour l'impression des deux autres images partielles correspondant aux deux couleurs non encore traitées, la feuille 10 éjectée est réintroduite manuellement deux fois dans l'imprimante. Il peut encore être prévu un guidage pour réintroduire, automatiquement par rebouclage, deux fois la feuille 10, avant de l'éjecter. Un mécanisme de recul de la feuille 10 partiellement imprimée peut de même être prévu pour le ramener dans la zone des capteurs de position. For printing the other two partial images corresponding to the two colors not yet treated, sheet 10 ejected is manually reinserted twice into the printer. Guidance can also be provided to reintroduce, automatically by looping, twice sheet 10, before eject it. A leaf recoil mechanism 10 partially print can also be provided to bring it back to the area position sensors.

D'une façon générale, il suffit de trois capteurs ponctuels pour déterminer la position de la feuille d'après deux bords de référence non parallèles, donc adjacents dans le cas d'une feuille parallélépipédique. Deux capteurs mutuellement espacés déterminent l'orientation et la position d'un bord de référence transversal 101 ou latéral 102 et le troisième capteur détermine la position de l'autre bord, latéral ou transversal.Generally, three point sensors are sufficient to determine the position of the sheet according to two edges of non-parallel reference, therefore adjacent in the case of a sheet parallelepiped. Two mutually spaced sensors determine the orientation and position of a reference edge transverse 101 or lateral 102 and the third sensor determines the position of the other edge, lateral or transverse.

La correction pour le recadrage correspondant aux trois degrés de liberté évoqués ci-dessus, deux degrés de liberté en translation, un degré de liberté en rotation, peut être effectuée, en tout ou partie, par des moyens mécaniques de recadrage de la feuille 10 par rapport à la tête 14, ou de celle-ci, alors mobile, par rapport à la feuille 10, respectivement des moyens électroniques de déplacement de l'image électronique selon ces trois degrés de liberté, dans la mesure où l'imprimante comporte une telle mémoire 16. Sinon, seul un décalage transversal, au fil de l'eau, est possible dans l'imprimante même.The correction for cropping corresponding to the three degrees of freedom mentioned above, two degrees of freedom in translation, a degree of freedom in rotation, can be performed, in all or part, by mechanical means of cropping the sheet 10 relative to head 14, or of the latter, then movable, by compared to sheet 10, respectively electronic means of displacement of the electronic image according to these three degrees of freedom, since the printer has such a memory 16. Otherwise, only a transverse shift, over the water, is possible in the printer itself.

Claims (8)

Imprimante pour machine de bureau, comportant des moyens d'introduction et de guidage (1, 6) de feuilles à imprimer (10) agencés pour coopérer avec des moyens (19) d'entraínement en commun d'une feuille (10) et d'un ruban encreur (20) devant une tête d'impression (14), par transfert depuis le ruban (20), agencée pour recevoir une image électronique (16) à imprimer, caractérisée par le fait qu'elle comporte des moyens (37, 38, 12) de détection de l'écart de position de la feuille à imprimer (10) par rapport à une position prédéterminée, agencés pour commander en conséquence des moyens (17, 31-36; 47, 49) de recadrage relatif de la feuille (10) et de l'image électronique (16).Office machine printer having means for introducing and guiding (1, 6) sheets to be printed (10) arranged to cooperate with means (19) for driving common sheet (10) and ink ribbon (20) in front of a printhead (14), by transfer from the ribbon (20), arranged for receiving an electronic image (16) for printing, characterized by the fact that it includes means (37, 38, 12) for detecting the difference in position of the sheet to be printed (10) relative to a predetermined position, arranged to control accordingly means (17, 31-36; 47, 49) for relative cropping of the sheet (10) and of the electronic image (16). Imprimante selon la revendication 1, dans laquelle les moyens de détection d'écart de position comportent au moins trois capteurs (37, 38,12) de détection ponctuelle de deux bords adjacents de référence (101, 102) de la feuille (10).The printer of claim 1, wherein the position deviation detection means comprise at least three point detection sensors (37, 38, 12) of two adjacent edges reference (101, 102) of the sheet (10). Imprimante selon la revendication 2, dans laquelle deux des capteurs (37, 38) sont disposés pour détecter le bord antérieur (101) de la feuille (10).The printer of claim 2, wherein two sensors (37, 38) are arranged to detect the anterior edge (101) of the sheet (10). Imprimante selon la revendication 3, dans laquelle les deux capteurs (37, 38) forment des butées de positionnement escamotables (7, 8).The printer of claim 3, wherein the two sensors (37, 38) form positioning stops retractable (7, 8). Imprimante selon l'une des revendications 1 à 4, dans laquelle les moyens de recadrage (17, 31-36; 47, 49) sont agencés pour effectuer un déplacement relatif entre la feuille (10) et la tête d'impression (14).Printer according to one of claims 1 to 4, in which the cropping means (17, 31-36; 47, 49) are arranged to effect a relative movement between the sheet (10) and the head printing (14). Imprimante selon la revendication 5, dans laquelle les moyens de recadrage comportent deux galets (35, 36) d'entraínement différentiel de la feuille (10). The printer of claim 5, wherein the cropping means comprise two rollers (35, 36) differential drive of the sheet (10). Imprimante selon l'une des revendications 1 à 6, dans laquelle les moyens de recadrage (17) sont agencés pour recadrer l'image électronique (16) par rapport à la tête d'impression (14).Printer according to one of claims 1 to 6, in which the cropping means (17) are arranged to crop the electronic image (16) relative to the print head (14). Imprimante selon l'une des revendications 1 à 7, dans laquelle les moyens (1, 6) d'introduction des feuilles (10) sont associés à des moyens (19, 25) d'éjection de celles-ci pour une impression couleur en plusieurs passes par un ruban polychrome (20).Printer according to one of claims 1 to 7, in which the means (1, 6) for introducing the sheets (10) are associated with means (19, 25) for ejecting them for a color printing in several passes by a polychrome ribbon (20).
EP19980401633 1997-07-23 1998-07-01 Printer for office machines with improved image centring Expired - Lifetime EP0893380B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9709350A FR2766414B1 (en) 1997-07-23 1997-07-23 OFFICE MACHINE PRINTER WITH IMPROVED IMAGE FRAMING
FR9709350 1997-07-23

Publications (2)

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EP0893380A1 true EP0893380A1 (en) 1999-01-27
EP0893380B1 EP0893380B1 (en) 2002-09-25

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Application Number Title Priority Date Filing Date
EP19980401633 Expired - Lifetime EP0893380B1 (en) 1997-07-23 1998-07-01 Printer for office machines with improved image centring

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EP (1) EP0893380B1 (en)
DE (1) DE69808193T2 (en)
FR (1) FR2766414B1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5074545A (en) * 1985-01-22 1991-12-24 Sharp Kabushiki Kaisha Device for preventing the transport of poorly aligned copy paper
DE4229010A1 (en) * 1991-08-30 1993-03-04 Asahi Optical Co Ltd Thermal transfer colour printer or copier - has repeated cycles of roller pairs to feed paper across print head followed by delivery to output stage
EP0650912A1 (en) * 1993-11-01 1995-05-03 NCR International, Inc. Apparatus for feeding and deskewing sheets comprising a dual drive
GB2287457A (en) * 1994-03-12 1995-09-20 Jarfalla Industry Competence C De-skewing fed documents

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5074545A (en) * 1985-01-22 1991-12-24 Sharp Kabushiki Kaisha Device for preventing the transport of poorly aligned copy paper
DE4229010A1 (en) * 1991-08-30 1993-03-04 Asahi Optical Co Ltd Thermal transfer colour printer or copier - has repeated cycles of roller pairs to feed paper across print head followed by delivery to output stage
EP0650912A1 (en) * 1993-11-01 1995-05-03 NCR International, Inc. Apparatus for feeding and deskewing sheets comprising a dual drive
GB2287457A (en) * 1994-03-12 1995-09-20 Jarfalla Industry Competence C De-skewing fed documents

Also Published As

Publication number Publication date
DE69808193T2 (en) 2003-06-05
FR2766414A1 (en) 1999-01-29
DE69808193D1 (en) 2002-10-31
FR2766414B1 (en) 1999-09-10
EP0893380B1 (en) 2002-09-25

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