EP2828089B1 - Device for printing documents of variable thicknesses - Google Patents
Device for printing documents of variable thicknesses Download PDFInfo
- Publication number
- EP2828089B1 EP2828089B1 EP13714228.7A EP13714228A EP2828089B1 EP 2828089 B1 EP2828089 B1 EP 2828089B1 EP 13714228 A EP13714228 A EP 13714228A EP 2828089 B1 EP2828089 B1 EP 2828089B1
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- EP
- European Patent Office
- Prior art keywords
- axis
- documents
- thickness
- strip
- document
- 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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- 230000000284 resting effect Effects 0.000 claims 1
- 235000021183 entrée Nutrition 0.000 description 16
- 238000006073 displacement reaction Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 241001071861 Lethrinus genivittatus Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000004447 silicone coating Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
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
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0035—Handling copy materials differing in thickness
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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
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/007—Conveyor belts or like feeding devices
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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
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/20—Platen adjustments for varying the strength of impression, for a varying number of papers, for wear or for alignment, or for print gap adjustment
Definitions
- the present invention relates to a document printing device.
- Such a device allows a user to print a large number of documents in series, typically several tens per minute to several hundred per minute.
- State-of-the-art devices provide printheads movable in height to adjust their distance from each of the documents to be printed, depending on the thickness of each document.
- the documents are held on a treadmill equipped with a suction system or suction documents through the carpet.
- the upper part of the main band may be delimited, along the routing direction, by two supports in contact with this main band and spaced in the direction of routing, these two supports delimiting a side of a deformable parallelogram which is deformable so that the upper part of the main band maintains its horizontality regardless of the position of the parallelogram.
- the deformable parallelogram is preferably located inside the loop delimited by the main band.
- the deformable parallelogram may be provided with means for exerting a restoring force on the supports so that these supports push the upper part of the main band along the axis parallel to the thickness axis and in the direction of the printhead.
- the adjustment means may be arranged to tilt the parallelogram towards the direction of travel as they pull the main band along the axis parallel to the thickness axis and in the opposite direction of the print head.
- the determining means may comprise means for estimating or calculating a theoretical thickness of each of the documents along the thickness axis, according to the constitution data of each document.
- the determination means may comprise means for measuring a thickness of each of the documents along the thickness axis.
- the means for moving the documents in the entry zone may further comprise a second roller whose periphery is in contact with the input strip, this second roller being preferably located outside the loop defined by the strip. and rotatably mounted about its central axis, so that the input band preferably passes between the first and second rollers.
- the upper portion of the main band may be elevated relative to the portion of the input band arranged to support and route the documents.
- the main band may have an elasticity at least ten times lower in the direction of travel than in a direction contained in a plane of the upper part and perpendicular to the direction of routing.
- the displacement means in the printing zone may comprise a roller whose periphery is in contact with the main band inside the loop defined by the main band and mounted in rotation about its central axis, and provided with a section of variable diameter so that said roll has a convex or curved shape of diameter less than its ends relative to its center.
- variants of the invention comprising only a selection of characteristics described subsequently isolated from the other characteristics described, if this selection of characteristics is sufficient to confer a technical advantage or to to differentiate the invention from the state of the art.
- This selection comprises at least one feature preferably functional without structural details, or with only a part of the structural details if this part alone is sufficient to confer a technical advantage or to differentiate the invention from the state of the prior art.
- the device 1, intended for the printing of documents 2, comprises an input zone 3, immediately followed (in a direction of routing 7) of a printing zone 4.
- the input zone 3 is arranged to convey the documents 2 in the printing zone 4.
- the device comprises a sensor 41 (preferably an optical sensor such as a photoelectric cell) located between the input zone 3 and the printing zone 4.
- the sensor 41 is arranged to detect a passage of a document 2 of the input area 3 to the print area 4, i.e. an entry of a document 2 in the print area 4.
- the printing area comprises a print head 5, provided with means for printing one or more colors on the documents 2.
- this print head 5 comprises one or more ink jet nozzles.
- the print head 5 is arranged to move in any direction (in particular 31, 32, 7, 24 described later) when it prints patterns on a document 2 or between the prints of two documents 2 when documents 2 scroll continuously on tape 8.
- the device 1 comprises a frame 46. All movements or movements described below will be described by default with respect to the stationary frame 46.
- the printing zone 4 further comprises displacement means 6 arranged to move (relative to the frame 46) in the printing zone 4 the documents 2 according to the routing direction 7.
- These moving means 6 comprise a web main 8 forming a closed loop and circulating endlessly (not necessarily circular).
- Band 8 has a Polyester and Cotton structure with a Silicone coating (coefficient of friction on rectified steel: 0.6, Traction for 1% elongation 186 N), allowing a good non-slip hold of documents 2.
- the band 8 ensures a good frictional hold of the documents 2.
- An upper portion 9 of this loop 8 is arranged to flow (relative to the frame 46) in the direction of conveyance 7 under the print head 5 when the head 5 is in a printing position. In its printing position, the print head 5 is arranged to print patterns on the documents 2 when these documents rest on the upper part 9 of the main band 8.
- the upper part 9 of the loop 8 is plane in a plane containing the routing direction 7.
- the main band 8 has a lower elasticity (preferably at least ten times lower) in the direction of routing 7 than in a direction 24 contained in the plane of the upper part 9 and perpendicular to the direction of routing 7.
- a variation in elongation in the direction of conveyance 7 is achieved during the passage time of a document 2 under the head less than about 20 ⁇ m, ie approximately the half spatial resolution of positioning of a drop of ink.
- the displacement means 6 comprise a roller 36 whose periphery is in contact with the main band 8 inside the loop defined by the main band 8.
- the roller 36 is rotated about its central axis (which is stationary compared to the chassis and parallel to the direction 24), and is provided with a variable diameter section so that said roller 36 has a convex or convex shape of diameter less than its ends relative to its center.
- the figure 4 is a view of this roller 36 in section in the plane 37 shown on the figure 2 . In this plane 37, the roll 36 has a "barrel" shape.
- the output roller 36 thus has a diameter variable of convex or convex shape, inferior to the extremities with respect to the center.
- the elongation or elasticity in the transverse direction (direction 24) of the strip 8 is intended to allow it to marry the generatrix of the output roller 36 which causes a self-centering effect of the strip 8 with the rotation of the roll 36.
- the "barrel" shape is exaggerated to be clearly visible.
- the roller 36 is motorized to cause the circulation of the strip 8.
- the displacement means 6 comprise a roll 38 whose periphery is in contact with the main band 8 inside the loop defined by the main band 8.
- the roll 38 (preferably cylindrical) is rotatably mounted about its axis central (which is stationary relative to the chassis and parallel to the direction 24).
- the roll 38 comprises means for measuring its rotational speed, such as an encoder (preferably optical) of relative position.
- the printing device 1 comprises means 10, 33 for determining a thickness of each of the documents 2 along an axis of thickness 11.
- the thickness axis 11 is preferably perpendicular to the direction of delivery 7 (and plan of the upper part 9).
- the printing zone 4 comprises adjustment means 12 arranged to move the upper part 9 of the main band 8 at least along an axis 13 parallel to the thickness axis 11 as a function of a value of d 2 document thickness provided by the determination means 10, 33 (while the displacement means 20 in the input zone 3 described below do not move along the axis 11).
- the adjustment means 12 may further be arranged to move the upper part 9 according to another perpendicular component to the axis 13, for example slightly forwards or backwards, but are arranged so that a majority of the displacement of the part 9 takes place along the axis 13.
- These two supports 14, 15 delimit one side, which extends in the direction of conveyance 7, of a deformable parallelogram 16.
- This parallelogram 16 is deformable so that the upper part 9 of the main band 8 maintains its horizontality which whatever the position of the parallelogram 16. This horizontality is defined relative to the frame 46, not necessarily with respect to the ground.
- the parallelogram 16 is located inside the loop delimited by the main band 8.
- Each of the rollers 14, 15 therefore forms one of the four vertices of the parallelogram 16.
- the other two vertices of the parallelogram 16 are formed by pins 25, 26 secured to the frame.
- a rod 27 connects the axis 25 to the axis of the support 14. This rod 27 is free to rotate about the axis 25 and the axis of the support 14.
- a rod 28 connects the axis 26 to the axis of the support 15. This rod 28 is free to rotate about the axis 26 and the axis of the support 15.
- a plate 29 connects the two supports 14, 15. This plate 29 is in contact with the upper part 9 of the strip 8.
- the plate 29 is flat and provides the flat shape of the upper part 9 of the strip 8.
- the deformable parallelogram 16 is provided with means 30 for exerting a restoring force on the supports 14, 15 (when these supports have left a "rest” position to move along the axis 13 parallel to the thickness axis 11 and in a direction 32 opposite to the print head 5).
- This restoring force pushes the supports 14, 15 and therefore the upper part 9 of the main strip 8 along the axis 13 parallel to the thickness axis and in the direction 31 of the print head 5.
- the means 30 for exerting a restoring force typically comprise a torsion spring 42 as illustrated in FIG. figure 3 .
- This spring comprises an end 43 which bears on the axis 26.
- the adjustment means 12 are arranged to slightly lean the parallelogram 16 towards the direction of delivery 7 when they pull the main strip 8 along the axis 13 parallel to the thickness axis 11 and in the opposite direction 32 of the print head 5.
- the adjustment means 12 comprise means 17 for pulling the main strip 8 and its upper part 9 along the axis 13 parallel to the thickness axis 11 and in the opposite direction 32 of the print head 5, with a force which depends on the value of the thickness of the document 2 supplied by the determination means 10, 33, and which therefore depends on the desired position of the upper part 9 of the main band 8 along the axis 13 parallel to the thickness axis 11 for the printing of this document 2.
- the means 17 for pulling the main strip comprise a roller 18, preferably cylindrical.
- the periphery of the roll 18 is in contact with the main band 8 and is located inside the loop delimited by the main band 8.
- the roller 18 is rotatably mounted about the central axis 19 of its cylindrical shape. This axis 19 is movable relative to the frame. This axis 19 is parallel to the direction 24.
- the means 17 for pulling the main band are arranged to pull the roll 18 in the direction 32 opposite to the print head 5.
- the means 17 comprise for example a motor 45 pulling or releasing a piston 44 integral with the roller 18.
- the displacement means 20 further comprise at least one roller 39, 40 whose periphery is in contact with the band 21 inside the loop delimited by the band 21.
- Each roll 39, 40 (preferably cylindrical) is mounted in rotation about its central axis (which is stationary relative to the frame and parallel to the direction 24).
- the roller 40 is motorized to cause the circulation of the band 21.
- the computing unit 33 comprises only technical means, typically electronic and / or computer and / or software, such as for example an analog or digital electronic circuit and / or a central computer unit and / or a microprocessor.
- the means 33 for calculating a theoretical thickness may be used in addition or alternatively measurement means 10.
- the determination of the thickness by measurement (by the means 10) and by calculation (by the unit 33) from information conveyed by the enveloping can be combined to improve the speed and reliability and accuracy of thickness compensation.
- the means 20 for moving the documents 2 in the entry zone 3 further comprises a second roller 34 (preferably cylindrical) whose periphery is in contact with the input band 21, this second roller 34 being located at the outside the loop defined by the input band 21 and mounted in rotation about its central axis (which is stationary relative to the frame and parallel to the direction 24).
- a second roller 34 preferably cylindrical whose periphery is in contact with the input band 21, this second roller 34 being located at the outside the loop defined by the input band 21 and mounted in rotation about its central axis (which is stationary relative to the frame and parallel to the direction 24).
- This second roll 34 does not take all the width (in the direction 24) of the input band 21, so as not to hinder the thickness measurement by the means 10.
- the means for moving the documents in the area of the inlet further comprises a third (preferably cylindrical) roll 35, the periphery of which is in contact with the input web, the third roll being located outside the loop defined by the input web and rotatably mounted. around its central axis (which is stationary relative to the frame and parallel to the direction 24).
- the second 34 and third 35 rollers are arranged to make passing between them a document 2 during its measurement of thickness by the measuring means 10.
- the input band 21 passes between firstly the first roll 22 and secondly the second 34 (and third 35) roll (x).
- the rollers 22, 34 (and 35) firmly hold the band 21 to prevent any movement, along the thickness axis 11, of the input band 21 at the level where the thickness measurement is made.
- the upper part 9 of the main band 8 is preferably raised (in the direction 31) relative to the portion of the input band 21 arranged to support and convey the documents 2.
- the unit 33 has stored (in a memory, for example flash type or hard disk) a reference position of the upper part 9 corresponding to a zero document thickness. For a document of thickness Z, the unit 33 is arranged to control a displacement of the upper part 9 so as to position it at a distance Z in the direction 32 and with respect to this reference position.
- a memory for example flash type or hard disk
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- Handling Of Sheets (AREA)
- Ink Jet (AREA)
- Common Mechanisms (AREA)
Description
La présente invention concerne un dispositif d'impression de documents.The present invention relates to a document printing device.
Un tel dispositif permet à un utilisateur d'imprimer un grand nombre de documents en série, typiquement plusieurs dizaines par minute à plusieurs centaines par minute.Such a device allows a user to print a large number of documents in series, typically several tens per minute to several hundred per minute.
On connaît des dispositifs d'impression de documents dont l'objectif est de pouvoir imprimer, de manière personnalisée, un grand nombre de documents en un temps cours, typiquement plusieurs dizaines d'enveloppes par minutes.There are known document printing devices whose purpose is to be able to print, in a personalized way, a large number of documents in a short time, typically several tens of envelopes per minute.
Ainsi, pour être rapides, de tels dispositifs ont bien souvent pour contrainte de réaliser l'impression de chaque document en un passage unique sous une tête d'impression (« single pass »). Ce type d'impression nécessite typiquement une tête d'impression très large, donc généralement à jet d'encres, et dont la qualité d'impression dépend généralement de manière importante de la distance séparant la tête d'impression du document à imprimer.Thus, to be fast, such devices are often constrained to achieve the printing of each document in a single pass under a print head ("single pass"). This type of printing typically requires a very large print head, so generally ink-jet, and whose print quality generally depends significantly on the distance between the print head and the document to print.
Les dispositifs de l'état de l'art proposent des têtes d'impression mobiles en hauteur de manière à ajuster leur distance par rapport à chacun des documents à imprimer, en fonction de l'épaisseur de chaque document. Les documents sont maintenus sur un tapis roulant muni d'un système de succion ou d'aspiration des documents à travers le tapis.State-of-the-art devices provide printheads movable in height to adjust their distance from each of the documents to be printed, depending on the thickness of each document. The documents are held on a treadmill equipped with a suction system or suction documents through the carpet.
Un des problèmes techniques de ce type de dispositifs de l'état de l'art est qu'ils sont complexes à mettre en oeuvre avec les technologies jet d'encre piézoélectriques ou thermiques. Ils imposent en effet des accélérations perturbant l'homogénéité et la pression des fluides (encre) ce qui contraint, à vitesse de défilement élevée des documents, de limiter l'amplitude de l'ajustement de hauteur de tête, ce qui est ainsi insuffisant par rapport aux attentes des utilisateurs. Ainsi l'homme du métier se heurte à plusieurs problèmes techniques :
- problème de complexité technique de la mise en oeuvre,
- problème de qualité d'impression : en perturbant l'homogénéité et la pression des fluides, on risque de diminuer la qualité d'impression,
- problème de stabilité de la tête : après un mouvement de la tête d'impression qui est lourde, on doit réussir à parfaitement la stabiliser avant une impression.
- problème de faiblesse d'intervalle d'épaisseur possible des documents : pour limiter la perturbation de l'homogénéité et de la pression des fluides, on évite de bouger la tête d'impression sur de trop grandes amplitudes,
- problème de la faible vitesse des documents défilant sous la tête : pour limiter la perturbation de l'homogénéité et de la pression des fluides, on évite de bouger la tête d'impression trop rapidement, ce qui va limiter la vitesse des documents défilant sous la tête.
- problem of technical complexity of the implementation,
- problem of print quality: disturbing the homogeneity and the pressure of the fluids, we risk reducing the quality of printing,
- problem of stability of the head: after a movement of the print head which is heavy, one must manage to perfectly stabilize it before printing.
- problem of weakness of possible thickness range of the documents: to limit the disturbance of the homogeneity and the pressure of the fluids, one avoids to move the print head on too large amplitudes,
- problem of the slow speed of the documents passing under the head: to limit the disturbance of the homogeneity and the pressure of the fluids, one avoids to move the print head too quickly, which will limit the speed of the documents scrolling under the head.
Cet objectif est atteint avec un dispositif d'impression de documents comprenant :
- une zone d'impression (de préférence précédée d'une zone d'entrée, la zone d'entrée étant agencée pour acheminer les documents dans la zone d'impression), la zone d'impression comprenant une tête d'impression,
- des moyens de déplacement agencés pour déplacer dans la zone d'impression des documents selon une direction d'acheminement, les moyens de déplacement dans la zone d'impression comprenant une bande principale formant une boucle fermée et montée en circulation sans fin et dont une partie supérieure est agencée pour circuler selon la direction d'acheminement sous la tête d'impression lorsque la tête est dans une position d'impression de sorte que la tête d'impression soit agencée pour imprimer des motifs sur les documents lorsque ces documents reposent sur la partie supérieure de la bande principale,
caractérisé en ce que :- le dispositif d'impression comprend des moyens pour déterminer une épaisseur de chacun des documents selon un axe d'épaisseur, et
- la zone d'impression comprend des moyens d'ajustement agencés pour déplacer la partie supérieure de la bande principale au moins le long d'un axe parallèle à l'axe d'épaisseur en fonction d'une valeur d'épaisseur de document fournie par les moyens de détermination, les moyens d'ajustement comprenant des moyens pour tirer la bande principale et sa partie supérieure le long de l'axe parallèle à l'axe d'épaisseur et en direction opposée de la tête d'impression, avec une force qui dépend d'une valeur d'épaisseur de document fournie par les moyens de détermination.
- dont le pourtour est en contact avec la bande principale à l'intérieur de la boucle délimitée par la bande principale, et
- monté en rotation autour de son axe central,
- a print area (preferably preceded by an input area, the input area being arranged to convey the documents in the print area), the print area comprising a print head,
- moving means arranged to move documents in the printing area in a direction of travel, the moving means in the printing area comprising a main band forming a closed loop and endlessly circulating and a part of which upper is arranged to flow in the direction of conveyance under the print head when the head is in a printing position so that the print head is arranged to print motives on documents when these documents rest on the upper part of the main band,
characterized in that- the printing device comprises means for determining a thickness of each of the documents along an axis of thickness, and
- the printing area comprises adjustment means arranged to move the upper part of the main band at least along an axis parallel to the thickness axis according to a document thickness value provided by the determining means, the adjusting means comprising means for pulling the main band and its upper part along the axis parallel to the thickness axis and in the opposite direction of the print head, with a force which depends on a document thickness value provided by the determining means.
- whose periphery is in contact with the main band within the loop defined by the main band, and
- mounted in rotation about its central axis,
La partie supérieure de la bande principale peut être délimitée, le long de la direction d'acheminement, par deux supports en contact avec cette bande principale et espacés selon la direction d'acheminement, ces deux supports délimitant un côté d'un parallélogramme déformable qui est déformable de sorte que la partie supérieure de la bande principale conserve son horizontalité quelle que soit la position du parallélogramme.The upper part of the main band may be delimited, along the routing direction, by two supports in contact with this main band and spaced in the direction of routing, these two supports delimiting a side of a deformable parallelogram which is deformable so that the upper part of the main band maintains its horizontality regardless of the position of the parallelogram.
Le parallélogramme déformable est de préférence situé à l'intérieur de la boucle délimitée par la bande principale.The deformable parallelogram is preferably located inside the loop delimited by the main band.
Le parallélogramme déformable peut être muni de moyens, pour exercer une force de rappel sur les supports de sorte que ces supports poussent la partie supérieure de la bande principale le long de l'axe parallèle à l'axe d'épaisseur et en direction de la tête d'impression.The deformable parallelogram may be provided with means for exerting a restoring force on the supports so that these supports push the upper part of the main band along the axis parallel to the thickness axis and in the direction of the printhead.
Les moyens d'ajustement peuvent être agencés pour pencher le parallélogramme vers la direction d'acheminement lorsqu'ils tirent la bande principale le long de l'axe parallèle à l'axe d'épaisseur et en direction opposée de la tête d'impression.The adjustment means may be arranged to tilt the parallelogram towards the direction of travel as they pull the main band along the axis parallel to the thickness axis and in the opposite direction of the print head.
Les moyens de détermination peuvent comprendre des moyens pour estimer ou calculer une épaisseur théorique de chacun des documents selon l'axe d'épaisseur, en fonction de données de constitution de chaque document.The determining means may comprise means for estimating or calculating a theoretical thickness of each of the documents along the thickness axis, according to the constitution data of each document.
Les moyens de détermination peuvent comprendre des moyens de mesure d'une épaisseur de chacun des documents selon l'axe d'épaisseur.The determination means may comprise means for measuring a thickness of each of the documents along the thickness axis.
La zone d'impression peut être précédée d'une zone d'entrée, la zone d'entrée étant agencée pour acheminer les documents dans la zone d'impression, le dispositif selon l'invention pouvant comprendre en outre des moyens pour déplacer les documents dans la zone d'entrée comprenant :
- une bande d'entrée formant une boucle fermée et montée en circulation sans fin, et
- un premier rouleau dont le pourtour est en contact avec la bande d'entrée, ce premier rouleau étant situé à l'intérieur de la boucle délimitée par la bande d'entrée et monté en rotation autour de son axe central,
- an entrance band forming a closed loop and endlessly circulating, and
- a first roll whose periphery is in contact with the input band, this first roll being located inside the loop defined by the input band and mounted in rotation about its central axis,
Les moyens pour déplacer les documents dans la zone d'entrée peuvent comprendre en outre un deuxième rouleau dont le pourtour est en contact avec la bande d'entrée, ce deuxième rouleau étant de préférence situé à l'extérieur de la boucle délimitée par la bande d'entrée et monté en rotation autour de son axe central, de sorte que la bande d'entrée passe de préférence entre les premier et deuxième rouleaux.The means for moving the documents in the entry zone may further comprise a second roller whose periphery is in contact with the input strip, this second roller being preferably located outside the loop defined by the strip. and rotatably mounted about its central axis, so that the input band preferably passes between the first and second rollers.
La partie supérieure de la bande principale peut être surélevée par rapport à la partie de la bande d'entrée agencée pour supporter et acheminer les documents.The upper portion of the main band may be elevated relative to the portion of the input band arranged to support and route the documents.
La bande principale peut posséder une élasticité au moins dix fois plus faible selon la direction d'acheminement que selon une direction contenue dans un plan de la partie supérieure et perpendiculaire à la direction d'acheminement.The main band may have an elasticity at least ten times lower in the direction of travel than in a direction contained in a plane of the upper part and perpendicular to the direction of routing.
Les moyens de déplacement dans la zone d'impression peuvent comprendre un rouleau dont le pourtour est en contact avec la bande principale à l'intérieur de la boucle délimitée par la bande principale et monté en rotation autour de son axe central, et muni d'une section de diamètre variable de sorte que le dit rouleau possède une forme convexe ou bombée de diamètre inférieur à ses extrémités par rapport à son centre.The displacement means in the printing zone may comprise a roller whose periphery is in contact with the main band inside the loop defined by the main band and mounted in rotation about its central axis, and provided with a section of variable diameter so that said roll has a convex or curved shape of diameter less than its ends relative to its center.
Les moyens d'ajustement peuvent être agencés pour :
- recevoir une valeur d'épaisseur fournie par les moyens de détermination,
- déplacer la partie supérieure de la bande principale le long de l'axe parallèle à l'axe d'épaisseur en fonction de cette valeur d'épaisseur, de préférence avant que ce document n'arrive sur la partie supérieure, et
- ne plus déplacer la partie supérieure lors d'une impression de motifs sur ce document par la tête d'impression.
- receive a value of thickness provided by the determination means,
- moving the upper part of the main band along the axis parallel to the thickness axis according to this thickness value, preferably before this document arrives on the upper part, and
- do not move the upper part when printing patterns on this document by the print head.
D'autres avantages et particularités de l'invention apparaîtront à la lecture de la description détaillée de mises en oeuvre et de modes de réalisation nullement limitatifs, et des dessins annexés suivants :
- la
figure 1 est une vue en perspective d'un mode de réalisation préférentiel (« meilleur mode ») de dispositif selon l'invention, - la
figure 2 est une vue en perspective d'une partie plus détaillée du dispositif de lafigure 1 , - la
figure 3 est une vue de profil d'une partie plus détaillée de lafigure 2 , et - la
figure 4 est une vue de face d'unrouleau 36 du dispositif de lafigure 1 .
- the
figure 1 is a perspective view of a preferred embodiment ("best mode") of a device according to the invention, - the
figure 2 is a perspective view of a more detailed part of the device of thefigure 1 , - the
figure 3 is a profile view of a more detailed part of thefigure 2 , and - the
figure 4 is a front view of aroller 36 of the device of thefigure 1 .
Ces modes de réalisation étant nullement limitatifs, on pourra notamment imaginer des variantes de l'invention ne comprenant qu'une sélection de caractéristiques décrites par la suite isolées des autres caractéristiques décrites, si cette sélection de caractéristiques est suffisante pour conférer un avantage technique ou pour différencier l'invention par rapport à de l'état de la technique antérieure. Cette sélection comprend au moins une caractéristique de préférence fonctionnelle sans détails structurels, ou avec seulement une partie des détails structurels si cette partie uniquement est suffisante pour conférer un avantage technique ou à différencier l'invention par rapport à l'état de la technique antérieure.These embodiments being in no way limitative, it will be possible to imagine variants of the invention comprising only a selection of characteristics described subsequently isolated from the other characteristics described, if this selection of characteristics is sufficient to confer a technical advantage or to to differentiate the invention from the state of the art. This selection comprises at least one feature preferably functional without structural details, or with only a part of the structural details if this part alone is sufficient to confer a technical advantage or to differentiate the invention from the state of the prior art.
On va tout d'abord décrire, en référence aux
Le dispositif 1, prévu pour l''impression de documents 2, comprend une zone d'entrée 3, immédiatement suivie (selon une direction d'acheminement 7) d'une zone d'impression 4.The device 1, intended for the printing of
La zone d'entrée 3 est agencée pour acheminer les documents 2 dans la zone d'impression 4.The
Le dispositif comprend un capteur 41 (de préférence un capteur optique telle une cellule photo électrique) située entre la zone d'entrée 3 et la zone d'impression 4. Le capteur 41 est agencé pour détecter un passage d'un document 2 de la zone d'entrée 3 vers la zone d'impression 4, c'est-à-dire une entrée d'un document 2 dans la zone d'impression 4.The device comprises a sensor 41 (preferably an optical sensor such as a photoelectric cell) located between the
La zone d'impression comprend une tête d'impression 5, munie de moyens pour imprimer une ou plusieurs couleurs sur les documents 2. Typiquement, cette tête d'impression 5 comprend une ou plusieurs buses de jet d'encre. La tête d'impression 5 est agencée pour ne se déplacer selon aucune direction (notamment 31, 32, 7, 24 décrites par la suite) lorsqu'elle imprime des motifs sur un document 2 ou entre les impressions de deux documents 2 lorsque des documents 2 défilent en continue sur la bande 8.The printing area comprises a
Le dispositif 1 comprend un châssis 46. Tous les déplacements ou mouvement décrits par la suite seront par défauts décrits par rapport au châssis immobile 46.The device 1 comprises a
La zone d'impression 4 comprend en outre des moyens de déplacement 6 agencés pour déplacer (par rapport au châssis 46) dans la zone d'impression 4 les documents 2 selon la direction d'acheminement 7. Ces moyens de déplacement 6 comprennent une bande principale 8 formant une boucle fermée et montée en circulation sans fin (pas nécessairement de manière circulaire).The
La bande 8 a une structure en Polyester et coton avec un revêtement Silicone (Coefficient de friction sur acier rectifié : 0,6 ; Traction pour 1% d'allongement 186 N), permettant un bon maintien antidérapant des documents 2.Band 8 has a Polyester and Cotton structure with a Silicone coating (coefficient of friction on rectified steel: 0.6, Traction for 1% elongation 186 N), allowing a good non-slip hold of
La bande 8 assure un bon maintien par friction des documents 2.The band 8 ensures a good frictional hold of the
Une partie supérieure 9 de cette boucle 8 est agencée pour circuler (par rapport au châssis 46) selon la direction d'acheminement 7 sous la tête d'impression 5 lorsque la tête 5 est dans une position d'impression. Dans sa position d'impression, la tête d'impression 5 est agencée pour imprimer des motifs sur les documents 2 lorsque ces documents reposent sur la partie supérieure 9 de la bande principale 8.An upper portion 9 of this loop 8 is arranged to flow (relative to the frame 46) in the direction of
La partie supérieure 9 de la boucle 8 est plane selon un plan contenant la direction d'acheminement 7.The upper part 9 of the loop 8 is plane in a plane containing the
La bande principale 8 possède une élasticité plus faible (de préférence au moins dix fois plus faible) selon la direction d'acheminement 7 que selon une direction 24 contenue dans le plan de la partie supérieure 9 et perpendiculaire à la direction d'acheminement 7. On atteint ainsi une variation d'élongation selon la direction d'acheminement 7, pendant la durée de passage d'un document 2 sous la tête 5 inférieure à environ 20 µm, soit approximativement la demi résolution spatiale de positionnement d'une goutte d'encre.The main band 8 has a lower elasticity (preferably at least ten times lower) in the direction of
Les moyens 6 de déplacement comprennent un rouleau 36 dont le pourtour est en contact avec la bande principale 8 à l'intérieur de la boucle délimitée par la bande principale 8. Le rouleau 36 est monté en rotation autour de son axe central (qui est immobile par rapport au châssis et parallèle à la direction 24), et est muni d'une section de diamètre variable de sorte que le dit rouleau 36 possède une forme convexe ou bombée de diamètre inférieur à ses extrémités par rapport à son centre. La
Les moyens 6 de déplacement comprennent un rouleau 38 dont le pourtour est en contact avec la bande principale 8 à l'intérieur de la boucle délimitée par la bande principale 8. Le rouleau 38 (de préférence cylindrique) est monté en rotation autour de son axe central (qui est immobile par rapport au châssis et parallèle à la direction 24). Le rouleau 38 comprend des moyens de mesure de sa vitesse de rotation, tel qu'un codeur (de préférence optique) de position relative.The displacement means 6 comprise a
Le dispositif d'impression 1 comprend des moyens 10, 33 pour déterminer une épaisseur de chacun des documents 2 selon un axe d'épaisseur 11. L'axe d'épaisseur 11 est de préférence perpendiculaire à la direction d'acheminement 7 (et au plan de la partie supérieure 9).The printing device 1 comprises means 10, 33 for determining a thickness of each of the
La zone d'impression 4 comprend des moyens d'ajustement 12 agencés pour déplacer la partie supérieure 9 de la bande principale 8 au moins le long d'un axe 13 parallèle à l'axe d'épaisseur 11 en fonction d'une valeur d'épaisseur de document 2 fournie par les moyens de détermination 10, 33 (alors que les moyens de déplacement 20 dans la zone d'entrée 3 décrits par la suite ne se déplacent pas selon l'axe 11).The
Les moyens d'ajustement 12 peuvent en outre être agencés pour déplacer la partie supérieure 9 selon une autre composante perpendiculaire à l'axe 13, par exemple légèrement vers l'avant ou vers l'arrière, mais sont agencés pour qu'une majorité du déplacement de la partie 9 s'effectue le long de l'axe 13.The adjustment means 12 may further be arranged to move the upper part 9 according to another perpendicular component to the
La partie supérieure 9 de la bande principale 8 est délimitée, le long de la direction d'acheminement 7, par deux supports 14, 15 en contact avec cette bande principale 8 et espacés selon la direction d'acheminement 7. Chacun de ces supports 14, 15 comprend un rouleau (typiquement cylindrique) :
- dont le pourtour est en contact avec la bande principale 8 à l'intérieur de la boucle délimitée par la bande principale 8, et
- monté en rotation autour d'un axe central mobile par rapport au châssis et parallèle à la
direction 24.
- whose periphery is in contact with the main band 8 inside the loop delimited by the main band 8, and
- rotatably mounted about a central axis movable relative to the frame and parallel to the
direction 24.
Ces deux supports 14, 15 délimitent un côté, qui s'étend selon la direction d'acheminement 7, d'un parallélogramme déformable 16. Ce parallélogramme 16 est déformable de sorte que la partie supérieure 9 de la bande principale 8 conserve son horizontalité quelle que soit la position du parallélogramme 16. Cette horizontalité est définie par rapport au châssis 46, pas nécessairement par rapport au sol.These two
Le parallélogramme 16 est situé à l'intérieur de la boucle délimitée par la bande principale 8.The parallelogram 16 is located inside the loop delimited by the main band 8.
Chacun des rouleaux 14, 15 forme donc un des quatre sommets du parallélogramme 16.Each of the
Les deux autres sommets du parallélogramme 16 sont formés par des axes 25, 26 solidaires du châssis.The other two vertices of the parallelogram 16 are formed by
Une biellette 27 relie l'axe 25 à l'axe du support 14. Cette biellette 27 est libre en rotation autour de l'axe 25 et de l'axe du support 14.A
Une biellette 28 relie l'axe 26 à l'axe du support 15. Cette biellette 28 est libre en rotation autour de l'axe 26 et de l'axe du support 15.A
Un plateau 29 relie les deux supports 14, 15. Ce plateau 29 est en contact avec la partie supérieure 9 de la bande 8. Le plateau 29 est plat et assure la forme plate de la partie supérieure 9 de la bande 8.A
Le parallélogramme déformable 16 est muni de moyens 30 pour exercer une force de rappel sur les supports 14, 15 (lorsque ces supports ont quitté une position « de repos » pour se déplacer le long de l'axe 13 parallèle à l'axe d'épaisseur 11 et selon une direction 32 opposée à la tête d'impression 5). Cette force de rappel pousse les supports 14, 15 et donc la partie supérieure 9 de la bande principale 8 le long de l'axe 13 parallèle à l'axe d'épaisseur et en direction 31 de la tête d'impression 5.The deformable parallelogram 16 is provided with
Les moyens 30 pour exercer une force de rappel comprennent typiquement un ressort à torsion 42 tel qu'illustré sur la
Les moyens d'ajustement 12 sont agencés pour légèrement pencher le parallélogramme 16 vers la direction d'acheminement 7 lorsqu'ils tirent la bande principale 8 le long de l'axe 13 parallèle à l'axe d'épaisseur 11 et en direction opposée 32 de la tête d'impression 5.The adjustment means 12 are arranged to slightly lean the parallelogram 16 towards the direction of
Les moyens d'ajustement 12 comprennent des moyens 17 pour tirer la bande principale 8 et sa partie supérieure 9 le long de l'axe 13 parallèle à l'axe d'épaisseur 11 et en direction opposée 32 de la tête d'impression 5, avec une force qui dépend de la valeur de l'épaisseur du document 2 fournie par les moyens de détermination 10, 33, et qui dépend donc de la position souhaitée de la partie supérieure 9 de la bande principale 8 le long de l'axe 13 parallèle à l'axe d'épaisseur 11 pour l'impression de ce document 2.The adjustment means 12 comprise means 17 for pulling the main strip 8 and its upper part 9 along the
Les moyens 17 pour tirer la bande principale comprennent un rouleau 18, de préférence cylindrique.The means 17 for pulling the main strip comprise a roller 18, preferably cylindrical.
Le pourtour du rouleau 18 est en contact avec la bande principale 8 et est situé à l'intérieur de la boucle délimitée par la bande principale 8.The periphery of the roll 18 is in contact with the main band 8 and is located inside the loop delimited by the main band 8.
Le rouleau 18 est monté en rotation autour de l'axe central 19 de sa forme cylindrique. Cet axe 19 est mobile par rapport au châssis. Cet axe 19 est parallèle à la direction 24.The roller 18 is rotatably mounted about the
Les moyens 17 pour tirer la bande principale sont agencés pour tirer ce rouleau 18 selon la direction 32 opposée à la tête d'impression 5. Les moyens 17 comprennent par exemple un moteur 45 tirant ou relâchant un piston 44 solidaire du rouleau 18.The means 17 for pulling the main band are arranged to pull the roll 18 in the
Le dispositif 1 comprend en outre des moyens 20 pour déplacer, selon la direction d'acheminement 7, les documents 2 dans la zone d'entrée 3, comprenant :
- une bande d'entrée 21 (de même nature que la bande 8) formant une boucle fermée et montée en circulation sans fin, et
- un premier rouleau 22 (de préférence cylindrique) dont le pourtour est en contact avec la bande d'entrée 21,
ce premier rouleau 22 étant situé à l'intérieur de la boucle délimitée par la bande d'entrée 21 et monté en rotation autour de son axe central 23 (immobile par rapport au châssis et parallèle à la direction 24).
- an input band 21 (of the same nature as the band 8) forming a closed loop and endlessly circulating, and
- a first roller 22 (preferably cylindrical) whose circumference is in contact with the input band 21, this
first roller 22 being located inside the loop defined by the input band 21 and mounted in rotation around its central axis 23 (stationary relative to the frame and parallel to the direction 24).
Les moyens 20 de déplacement comprennent en outre au moins un rouleau 39, 40 dont le pourtour est en contact avec la bande 21 à l'intérieur de la boucle délimitée par la bande 21. Chaque rouleau 39, 40 (de préférence cylindrique) est monté en rotation autour de son axe central (qui est immobile par rapport au châssis et parallèle à la direction 24).The displacement means 20 further comprise at least one
Le rouleau 40 est motorisé pour entrainer la circulation de la bande 21.The
Les moyens de détermination 10, 33 d'épaisseur comprennent :
- 1) des moyens 33 (unité de calcul) pour estimer ou calculer une épaisseur théorique de chacun des documents 2 selon l'axe d'épaisseur 11, en fonction de données de constitution de chaque
document 2 ; ces moyens 33 sont agencés pour calculer une épaisseur théorique de chacun des documents 2 à partir d'informations de constitution du document fournies en temps réel et de façon synchrone avec le document, par exemple par un dispositif en amont. Par exemple, dans la variante où le dispositif 1 est disposé en ligne en sortie d'une machine de mise sous plis, cette dernière machine sait combien de feuillets et d'encarts publicitaires elle a insérée dans chacun des documents (aussi appelés « plis »). Egalement elle sait dire quelle méthode elle a utilisée pour plier les documents et quels sont les grammages de chaque document. L'unité 33 est agencée pour en déduire par calcul et rapprochements statistiques une épaisseur probable du document, pour envoyer des commandes aux moyens d'ajustement 12 afin de positionner correctement la hauteur (définie selon lesdirections 31 et 32) de la partie supérieure 9 de la bande 8 lorsque ce document passe sous la tête d'impression 5. - 2) des moyens de mesure 10 d'une épaisseur de chacun des documents 2 selon l'axe d'épaisseur 11. Les moyens 10 de mesure d'épaisseur sont situés à l'extérieur de la boucle délimitée par la bande d'entrée 21 de sorte que l'axe d'épaisseur 11 passe par le premier rouleau 22 (ou de préférence plus précisément par son axe central 23). Les moyens de mesure 10 comprennent de préférence un système de mesure de distance par ultrason ou faisceau laser (dont le faisceau est superposé à l'axe 11). Les moyens 10 sont calibrés pour qu'une longueur mesurée allant des moyens 10 jusqu'à la bande d'entrée 21 corresponde à une épaisseur de
document 2 nulle. Plus la longueur mesurée par les moyens 10 entre les moyens 10et un document 2 est faible, plus l'épaisseur de ce document est importante.
- 1) means 33 (calculation unit) for estimating or calculating a theoretical thickness of each of the
documents 2 along thethickness axis 11, as a function of constitution data of eachdocument 2; these means 33 are arranged to calculate a theoretical thickness of each of thedocuments 2 from information constituting the document provided in real time and synchronously with the document, for example by an upstream device. For example, in the variant where the device 1 is placed in line at the output of a wrapping machine, the latter machine knows how many sheets and advertising inserts it has inserted into each of the documents (also called "folds"). ). She can also tell which method she used to fold the documents and what are the grammages of each document. The unit 33 is arranged to deduce by calculation and statistical approximations a probable thickness of the document, to send commands to the adjustment means 12 in order to correctly position the height (defined along thedirections 31 and 32) of the upper part 9 of the strip 8 when this document passes under theprint head 5. - 2) means 10 for measuring a thickness of each of the
documents 2 along thethickness axis 11. The thickness measuring means 10 are located outside the loop defined by the input band 21 so that thethickness axis 11 passes through the first roll 22 (or preferably more precisely by its central axis 23). The measuring means 10 preferably comprise an ultrasonic distance measuring system or laser beam (whose beam is superimposed on the axis 11). The means 10 are calibrated so that a measured length from themeans 10 to the input band 21 corresponds to a document thickness of 2 zero. The shorter the length measured by themeans 10 between themeans 10 and adocument 2, the greater the thickness of this document.
L'unité 33 de calcul comprend uniquement des moyens techniques, typiquement électroniques et/ou informatiques et/ou logiciels, comme par exemple un circuit électronique analogique ou numérique et/ou une unité centrale d'ordinateur et/ou un microprocesseur.The computing unit 33 comprises only technical means, typically electronic and / or computer and / or software, such as for example an analog or digital electronic circuit and / or a central computer unit and / or a microprocessor.
Pour la détermination d'épaisseur, les moyens 33 pour calculer une épaisseur théorique peuvent être utilisés en complément ou alternativement des moyens de mesure 10. La détermination de l'épaisseur par mesure (par les moyens 10) et par calcul (par l'unité 33) à partir d'informations transmises par la mise sous plis peuvent être combinées pour améliorer la rapidité et la fiabilité et précision de compensation d'épaisseur.For the determination of thickness, the means 33 for calculating a theoretical thickness may be used in addition or alternatively measurement means 10. The determination of the thickness by measurement (by the means 10) and by calculation (by the unit 33) from information conveyed by the enveloping can be combined to improve the speed and reliability and accuracy of thickness compensation.
Les moyens 20 pour déplacer les documents 2 dans la zone d'entrée 3 comprennent en outre un deuxième rouleau 34 (de préférence cylindrique) dont le pourtour est en contact avec la bande d'entrée 21, ce deuxième rouleau 34 étant situé à l'extérieur de la boucle délimitée par la bande d'entrée 21 et monté en rotation autour de son axe central (qui est immobile par rapport au châssis et parallèle à la direction 24).The means 20 for moving the
Ce deuxième rouleau 34 ne prend pas toute la largueur (selon la direction 24) de la bande d'entrée 21, de manière à ne pas entraver la mesure d'épaisseur par les moyens 10. Les moyens pour déplacer les documents dans la zone d'entrée comprennent en outre un troisième rouleau 35 (de préférence cylindrique) dont le pourtour est en contact avec la bande d'entrée, ce troisième rouleau étant situé à l'extérieur de la boucle délimitée par la bande d'entrée et monté en rotation autour de son axe central (qui est immobile par rapport au châssis et parallèle à la direction 24). Les deuxième 34 et troisième 35 rouleaux sont agencés pour faire passer entre eux un document 2 lors de sa mesure d'épaisseur par les moyens de mesure 10.This
La bande d'entrée 21 passe entre d'une part le premier 22 rouleau et d'autre part le deuxième 34 (et troisième 35) rouleau(x). Ainsi, les rouleaux 22, 34 (et 35) maintiennent fermement la bande 21 pour éviter tout mouvement, selon l'axe d'épaisseur 11, de la bande d'entrée 21 au niveau où est effectuée la mesure d'épaisseur.The input band 21 passes between firstly the
La partie supérieure 9 de la bande principale 8 est de préférence surélevée (selon la direction 31) par rapport à la partie de la bande d'entrée 21 agencée pour supporter et acheminer les documents 2.The upper part 9 of the main band 8 is preferably raised (in the direction 31) relative to the portion of the input band 21 arranged to support and convey the
Les moyens d'ajustement 12 comprennent l'unité de commande 33 qui est agencée pour commander les moyens 17. L'unité 33 est agencée pour :
- recevoir une valeur d'épaisseur d'un document 2 (typiquement lorsque
ce document 2 passe sous les moyens de mesure 10, c'est-à-dire quece document 2 coupe l'axe 11), cette épaisseur étant fournie par les moyens de détermination 10, 33, puis rester en attente d'un signal d'entrée de ce document dans lazone d'impression 4, puis - lorsque ce document entre dans la
zone d'impression 4, recevoir de la part du capteur 41 le signal d'entrée dece document 2 dans lazone d'impression 4 et mémoriser le moment d'entrée dece document 2 dans lazone d'impression 4, et lorsque ce document 2 entre dans lazone d'impression 4, recevoir de la part du rouleau 38 la vitesse de rotation du rouleau 38, puis calculer à partir de cette vitesse de rotation et du périmètre du rouleau 38 la vitesse de déplacement de la partie supérieure 9 selonla direction 7, qui correspond à la vitesse de déplacement dece document 2 selonla direction 7, puis- calculer, à partir de la vitesse de déplacement de
ce document 2 et du moment d'entrée dece document 2 dans lazone d'impression 4, le moment d'impression oùce document 2 va se trouver sous la tête d'impression pour être imprimé, puis - commander les moyens 17 pour déplacer la partie supérieure 9 de la bande principale 8 le long de l'axe 13 parallèle à l'axe d'épaisseur 11 en fonction de la valeur de l'épaisseur de
ce document 2, de sorte que le déplacement de la partie supérieure 9 soit terminé au moment d'impression, c'est-à-dire de préférence avant quece document 2 n'arrive sur la partie supérieure 9, - commander la tête d'impression 5 pour lancer l'impression sur
ce document 2 au moment d'impression, et - ne plus déplacer la partie supérieure 9 lors d'une impression de motifs sur
ce document 2 par la tête d'impression 5,
toutes ces étapes étant mises en oeuvre pour chacun des documents défilants dans lazone d'entrée 3 puis dans lazone d'impression 4.
- receive a thickness value of a document 2 (typically when this
document 2 passes under the measuring means 10, that is to say that thisdocument 2 intersects the axis 11), this thickness being provided by themeans 10, 33, and then wait for an input signal of this document in theprint area 4, then - when this document enters the
printing zone 4, to receive from thesensor 41 the input signal of thisdocument 2 in theprinting zone 4 and to memorize the moment of entry of thisdocument 2 into thezone d print 4, and - when this
document 2 enters theprinting zone 4, receive from theroll 38 the speed of rotation of theroll 38, then calculate from this speed of rotation and the perimeter of theroll 38 the speed of movement of the part 9 in thedirection 7, which corresponds to the speed of movement of thisdocument 2 according to thedirection 7, then - calculate, from the speed of movement of this
document 2 and the time of entry of thisdocument 2 into theprinting zone 4, the print time where thisdocument 2 will be under the print head for to be printed and then - controlling the means 17 to move the upper part 9 of the main band 8 along the
axis 13 parallel to thethickness axis 11 as a function of the value of the thickness of thisdocument 2, so that the displacement of the upper part 9 is completed at the time of printing, that is to say preferably before thisdocument 2 arrives on the upper part 9, - order the
print head 5 to start printing on thisdocument 2 at the time of printing, and - no longer move the upper part 9 during a printing of patterns on this
document 2 by theprint head 5,
all these steps being implemented for each of the scrolling documents in theentry zone 3 and then in theprinting zone 4.
L'unité 33 a stocké (dans une mémoire, par exemple type flash ou disque dur) une position de référence de la partie supérieure 9 correspondant à une épaisseur nulle de document. Pour un document d'épaisseur Z, l'unité 33 est agencée pour commander un déplacement de la partie supérieure 9 de manière à la positionner à une distance Z selon la direction 32 et par rapport à cette position de référence.The unit 33 has stored (in a memory, for example flash type or hard disk) a reference position of the upper part 9 corresponding to a zero document thickness. For a document of thickness Z, the unit 33 is arranged to control a displacement of the upper part 9 so as to position it at a distance Z in the
Selon l'invention, on propose ainsi un dispositif 1 qui est :
- plus simple à mettre en oeuvre que l'état de l'art, car il ne comprend pas de mécanisme complexe d'aspiration ou de succion des
documents 2 mais un simple maintien des documents par une bande « rugueuse » ou non glissante ; il ne comprend pas de motorisation complexe qui serait nécessaire pour bouger de manière très réactive la tête 5 en hauteur pourchaque document 2 alors que cette tête 5 est lourde et nécessite une précision de placement typiquement inférieure à 20µm, - avec une bonne qualité d'impression, car
la tête 5 est immobile pendant l'impression et même entre deux impressions de documents évitant ainsi les vibrations des buses de jet d'encre de la tête 5, - avec un grand intervalle d'épaisseur possible des documents, et
- très rapide (typiquement jusqu'à 330 enveloppes par minutes) notamment du fait de la très grande réactivité du moteur 45 qui est couplé à la force de rappel du ressort 42.
- simpler to implement than the state of the art, because it does not include a complex mechanism for suction or
suction documents 2 but a simple maintenance of documents by a strip "rough" or non-slip; it does not include a complex motorization that would be necessary to move the head in a highlyresponsive manner 5 for eachdocument 2 while thishead 5 is heavy and requires a placement accuracy typically less than 20 .mu.m, - with a good print quality, because the
head 5 is stationary during printing and even between two document prints thus avoiding the vibrations of the ink jet nozzles of thehead 5, - with a wide range of possible thickness of documents, and
- very fast (typically up to 330 envelopes per minute) especially because of the very high reactivity of the
motor 45 which is coupled to the restoring force of thespring 42.
Claims (14)
- Device (1) for printing documents (2) comprising:- a printing area (4), the printing area comprising a print head (5),- movement means (6) arranged for moving, in the printing area, documents in a conveying direction (7), the movement means in the printing area comprising a main strip (8) forming a closed loop and mounted in endless circulation, an upper portion (9) of which is arranged to circulate in the conveying direction under the print head when the head is in a printing position such that the print head is arranged for printing patterns on the documents when these documents are resting on the upper portion of the main strip, characterized in that:- the printing device comprises means (10,33) for determining a thickness of each of the documents according to a thickness axis (11), and- the printing area comprises adjustment means (12) arranged for moving the upper portion of the main strip at least along an axis (13) parallel to the thickness axis depending on a document thickness value provided by the determining means, the adjustment means (12) comprising means (17) for pulling the main strip (8) and its upper portion (9) along the axis (13) parallel to the thickness axis and in a direction (32) opposite to the print head (5), with a force which depends on a document thickness value provided by the determining means (10, 33).
- Device according to claim 1, characterized in that the means (12) for pulling the main strip comprise a roller (18):- the periphery of which is in contact with the main strip (8) inside the loop delimited by the main strip, and- rotatably mounted about its central axis (19),and also comprise means (17) arranged for pulling this roller in the direction (32) opposite to the print head.
- Device according to claim 1 or 2, characterized in that the upper portion (9) of the main strip is delimited, along the conveying direction, by two supports (14, 15) in contact with this main strip and spaced in the conveying direction, these two supports delimiting one side of a deformable parallelogram (16) which is deformable such that the upper portion of the main strip remains horizontal irrespective of the position of the parallelogram.
- Device according to claim 3, characterized in that the parallelogram is situated inside the loop delimited by the main strip (8).
- Device according to claim 3 or 4, characterized in that the deformable parallelogram is provided with means (30) for exerting a restoring force on the supports such that these supports push the upper portion (9) of the main strip along the axis (13) parallel to the thickness axis and in the direction (31) of the print head (5).
- Device according to any one of claims 3 to 5, characterized in that the adjustment means (12) are arranged for tilting the parallelogram towards the conveying direction (7) when they pull the main strip along the axis (13) parallel to the thickness axis and in the direction (32) opposite to the print head.
- Device according to any one of the previous claims, characterized in that the determining means (10, 33) comprise means (33) for estimating or calculating a theoretical thickness of each of the documents according to the thickness axis, depending on data relating to the constitution of each document.
- Device according to any one of claims 1 to 7, characterized in that the determining means (10, 33) comprise means (10) for measuring a thickness of each of the documents according to the thickness axis (11).
- Device according to the previous claim, characterized in that the printing area (4) is preceded by an input area (3), the input area (3) being arranged for conveying the documents into the printing area, the device (1) according to the invention also comprising means (20) for moving the documents in the input area comprising:- an input strip (21) forming a closed loop and mounted in endless circulation, and- a first roller (22) the periphery of which is in contact with the input strip, this first roller being situated inside the loop delimited by the input strip and rotatably mounted about its central axis (23),the thickness measuring means being situated outside the loop delimited by the input strip (21) such that the thickness axis (11) passes through the first roller (22).
- Device according to claim 9, characterized in that the means (20) for moving the documents in the input area also comprise a second roller (34) the periphery of which is in contact with the input strip, this second roller being situated outside the loop delimited by the input strip and rotatably mounted about its central axis, such that the input strip (21) passes between the first (22) and second rollers (34).
- Device according to claim 9 or 10, characterized in that the upper portion (9) of the main strip (8) is raised with respect to the portion of the input strip (21) arranged for supporting and conveying the documents (2).
- Device according to any one of the previous claims, characterized in that the main strip has an elasticity at least ten times lower in the conveying direction (7) than in a direction (24) contained in a plane of the upper portion and perpendicular to the conveying direction.
- Device according to any one of the previous claims, characterized in that the movement means (6) comprise a roller (36) the periphery of which is in contact with the main strip (8) inside the loop delimited by the main strip and rotatably mounted about its central axis, and provided with a cross-section of variable diameter such that said roller has a convex or curved shape with a diameter that is smaller at its ends than at its centre.
- Device according to any one of the previous claims, characterized in that the adjustment means (12) are arranged for:- receiving a thickness value provided by the determining means (10, 33),- moving the upper portion (9) of the main strip along the axis (13) parallel to the thickness axis (11) depending on this thickness value, and- no longer moving the upper portion (9) during a printing of patterns on this document (2) by the print head (5).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1252511A FR2988325B1 (en) | 2012-03-21 | 2012-03-21 | DEVICE FOR PRINTING DOCUMENTS OF VARIABLE THICKNESS |
PCT/EP2013/055880 WO2013139883A1 (en) | 2012-03-21 | 2013-03-21 | Device for printing documents of variable thicknesses |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2828089A1 EP2828089A1 (en) | 2015-01-28 |
EP2828089B1 true EP2828089B1 (en) | 2018-07-18 |
Family
ID=48047989
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13714228.7A Not-in-force EP2828089B1 (en) | 2012-03-21 | 2013-03-21 | Device for printing documents of variable thicknesses |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2828089B1 (en) |
FR (1) | FR2988325B1 (en) |
WO (1) | WO2013139883A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107310280A (en) * | 2017-06-23 | 2017-11-03 | 安徽新华印刷股份有限公司 | A kind of printer drying unit |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4509891B2 (en) * | 2005-08-24 | 2010-07-21 | 株式会社東芝 | Belt drive |
US8353510B2 (en) * | 2010-05-17 | 2013-01-15 | Lindsay Brett A | Variable media feed system and printhead apparatus |
-
2012
- 2012-03-21 FR FR1252511A patent/FR2988325B1/en not_active Expired - Fee Related
-
2013
- 2013-03-21 WO PCT/EP2013/055880 patent/WO2013139883A1/en active Application Filing
- 2013-03-21 EP EP13714228.7A patent/EP2828089B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
FR2988325B1 (en) | 2014-12-05 |
EP2828089A1 (en) | 2015-01-28 |
WO2013139883A1 (en) | 2013-09-26 |
FR2988325A1 (en) | 2013-09-27 |
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