EP0081443B1 - Preadjusting method for a dry offset machine - Google Patents

Preadjusting method for a dry offset machine Download PDF

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Publication number
EP0081443B1
EP0081443B1 EP82420171A EP82420171A EP0081443B1 EP 0081443 B1 EP0081443 B1 EP 0081443B1 EP 82420171 A EP82420171 A EP 82420171A EP 82420171 A EP82420171 A EP 82420171A EP 0081443 B1 EP0081443 B1 EP 0081443B1
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EP
European Patent Office
Prior art keywords
template
blanket
sector
axis
plate
Prior art date
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Expired
Application number
EP82420171A
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German (de)
French (fr)
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EP0081443A1 (en
Inventor
Gilbert Edelmann
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.)
Albea Tubes France SAS
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Cebal SAS
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Priority to AT82420171T priority Critical patent/ATE17681T1/en
Publication of EP0081443A1 publication Critical patent/EP0081443A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/10—Forme cylinders
    • B41F13/12—Registering devices
    • B41F13/16—Registering devices with means for displacing the printing formes on the cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/005—Attaching and registering printing formes to supports
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/36—Means for registering or alignment of print plates on print press structure

Definitions

  • the present invention relates to a method for presetting a dry offset machine intended for printing cylindrical or conical parts.
  • Many products are presented in cylindrical or conical containers, so for example in the field of cosmetics, aerosol tubes and jars are used. Glue tubes, yogurt jars and spray paints are other examples.
  • the decoration or the indications which appear on these containers are printed by means of dry offset machines. These machines are quite expensive, so it is advisable to use them almost continuously to amortize them. This is even more imperative when the printing is carried out by a machine integrated into a complete production line in which the parts are shaped, printed, dried, undergo a final machining and are even sometimes filled and packaged. In such production lines, any downtime presents a considerable loss.
  • the margins of the printed area of the transparent proof piece corresponding to a printing plate or working plate are aligned with reference lines drawn on a template and central coordinate lines are drawn on this transparent test piece as an extension of the central coordinate lines also written on the template. Then, the transparent test piece is positioned on a perforation device using these central coordinate lines and two holes of location determined with respect to these lines are perforated there, which makes it possible to position the test piece on the cylindrical device for fixing the printing plate using two lugs carried by this device, then adjusting the position of the printing plate, placed on the device below the transparent test piece, by moving this printing plate to make its printed image coincide with that of the proof piece.
  • the precision of the adjustment in machine depends on the precision with which the perforations were practiced as well as on the exact adjustment of the pins or claws to the shape of the perforations. This precision is limited by the necessary characteristics of the material used to make the plates, as well as by the difficulty of making claws which are both mobile and which however have no play. In practice, these systems are little used because they do not give not full satisfaction.
  • the machine shots are therefore adjusted most of the time by trial and error, the duration of the operation then depending on the skill or luck of the machine operator. For a four-color machine, therefore having four sectors on which four plates are mounted, the setting time is approximately two hours. It is with the intention of reducing this adjustment time to approximately fifteen minutes that the present invention was made.
  • the method of the invention uses, analogously to the prior art, reference axes and reference crosses.
  • two reference axes and reference crosses are reproduced on all the templates and clichés which are taken from a basic matrix film on which these axes and these crosses have been engraved.
  • the transfer of the reference axes of each template to the corresponding sector, once the position of this template has been set, will then allow quick and precise adjustment of the position of the pictures.
  • the layout of the reference axes on the sectors and the adjustment of the photographs are made by means of perforations of the templates and photographs, not used in themselves as a means of positioning as is known from the prior art, but as windows .
  • the method of the invention differs from the prior art by the use of printing tests for the precise adjustment of the master template and the other templates on the corresponding sectors.
  • the adjustment of the position of the master template on the corresponding plate holder sector is thus carried out using printing tests with the blanket and with a test piece: alignment bars carried by the master template then deposit images on the blanket, these images are the source of images deposited on the proof-piece then redeposited by it on the blanket, and the misalignment of these redeposited images with respect to the images deposited on the blanket by the bars of the master jig allow the position of this master jig to be adjusted.
  • the positions of the other templates on their respective sectors are then adjusted more simply by means of printing tests with the blanket without proof-piece, by comparing the positions of the images of the reference crosses deposited on the blanket by the template to set and by the master template already set.
  • the tracing of the axes on each sector follows the adjustment of the corresponding template by tracing portions of axes through the perforations of the template as already indicated, then by tracing the axes connecting these portions after removing the template.
  • a process as described in the preamble of claim 1 is known from the specification FR-A-2312373.
  • the method of adjusting the machine and adjusting the working plates on such a machine comprises, according to the invention, operations or steps for preparing the films, templates and plates used (steps a) to f)), then adjustment steps g) to i).
  • the operations or stages of preparation are:
  • Figure 3 does not show the image printed on the blanket as it actually appears, in fact, the templates being engraved in positive, they are "readable”, which has the consequence that the blanket is "unreadable” since the image is reversed. In the drawing, this inversion has been deliberately ignored so that the reader finds the various elements in the same arrangement in all the figures.
  • the preset template is a thin plate, identical to those usually used in dry offset.
  • the template 1 is produced according to the same process as a working plate.
  • the various elements that appear on the template in the figures are first arranged on a lithorthochromatic film allowing copying on photopolymer plates, the plates then being immersed in a washing bath creating the relief.
  • Usual locating crosses 2 in photoengraving are placed on a film.
  • Two axes AA 'and BB' are added.
  • the axis AA ′ is arranged parallel to the axis of rotation of the plate-holding sector on which the template will be fixed in a subsequent step.
  • the axis AA ' is located near the right hooking margin 3 of the template. Its position more or less close to said margin does not play a role.
  • the second axis BB ' is then arranged perpendicular to the axis AA' in the variant presented.
  • the direction of the axis BB ' is not, however, necessarily perpendicular to the axis AA', but it is preferable that the two axes form an angle between 80 and 100 ° between them.
  • the film carrying the locating crosses 2 and the axes AA 'and BB' constitutes a basic matrix.
  • the two right bars 9 and 11 are placed at a distance from the right edge 12 of the plate which varies according to the machine on which the plates will have to work. For a machine of the W1FAG type, the distance which separates the right edge 12 of the plate from the right edge 13 of the bars 9 and 11 is fixed at 40 mm.
  • the top 14 of the bar 9 is arranged 25 mm from the top of the plate 15.
  • the base 16 of the bar 11 is located 25 mm from the bottom of the plate 17.
  • the two left bars 8 and 10 have the same dimensions as the two bars on the right. Their positioning on the photograph takes into account two factors. First, their position is determined by two perpendicular to the axis AA '. One of them is raised by the vertex 14 of the right upper bar 9. The vertex 18 of the bar 8 is aligned on this perpendicular. In the same way, the base 16 of the bar 11 and the base 19 of the bar 10 are aligned on the same perpendicular to the axis AA '.
  • the distance which separates the right side 13 of the two right bars 9 and 11 from the left side 20 of the two left bars 8 and 10 is determined by the development of the parts on which the printing will finally take place.
  • the usual diameters of the parts which are printed by means of plates of the format shown are 35, 40 and 45 mm.
  • the developments of these parts are therefore respectively 109.2 mm, 124.8 mm and 140.4 mm.
  • the distance is 124.8 mm and thus corresponds to a part 40 mm in diameter.
  • the number of templates that must be engraved depends on the number of color groups in the machine. For a dry offset press with four color groups, four templates are produced.
  • the first of these four templates includes all the elements described so far, namely the cross marks 2, the positioning axes AA 'and BB' and the alignment bars. 8,9,10 and 11 (fig. 2).
  • the other three templates are identical to each other, but only have crosses 2 and axes AA 'and BB' (fig. 1).
  • the presetting begins with the positioning of the master template on the first color group of the machine.
  • the master jig 100 is the one which has the alignment bars 8, 9, 10 and 11 in addition to the crosses 2 and the axes AA 'and BB'.
  • the master template is fixed on the sector corresponding to the first group.
  • a test piece 21 is then placed on the workpiece mandrel 22 (fig. 3).
  • a passage is made with the blanket 23.
  • the ink is transferred from the template to the blanket 23 then, from the latter, to the test piece 21.
  • the end of the blanket 23 is not not yet adjusted and an additional part 24 protrudes. Therefore, the blanket 23 is in contact with the test piece 21 over a developed length greater than the development of the piece.
  • the ink that the blancher 23 deposited on the proof piece 21 is redeposited, after the piece has completed a full turn, on the additional part of the blanket.
  • the first patterns deposited by the blanket are the bars 8 and 20, these are printed 8 'and 10' on the piece 21 then redeposited on the blanket 8 "and 10". It is then checked that the top 18 "of the bar 8" is aligned at the same height as the top 14 of the bar 9 which marks the end of the blanket. We also check the alignment of the base 19 "of the bar 10" with the base 16 of the bar 11. If the vertices 18 "and 14 and the bases 19" and 16 are not aligned, we adjust the master template 100 on the sector by the set of fixing bars 34 (fig. 6) until said alignment is obtained. When the alignment is obtained, we have the demonstration that the axis AA 'as well as the alignment bars 8, 9, 10 and 11 are well oriented parallel to the axis of rotation of the sector.
  • the master template 100 being correctly positioned on the first sector, the sector is marked (fig. 4) by means of a stylus by tracing two marks aligned on the axis AA 'by the perforations 4 and 6 and two others marks aligned on the axis BB 'by the perforations 5 and 7.
  • the guide has a countersink 28 which follows the relief of the axis 28 and drives the stylus by sliding on the rail formed by the relief of the axis.
  • one of the three identical templates shown in fig. 1. We then pass over the blanket, but without using a proof piece this time.
  • the master template 100 which is mounted on the first sector deposits its patterns, in particular the locating crosses 2 on the blanket as in FIG. 3.
  • the second template 1 in turn deposits its patterns, as shown in FIG. 1 on the blanket.
  • the second template is then adjusted on the second sector until its locating crosses 2 exactly coincide on the blanket with the crosses 2 left by the master template 100.
  • the marking of the second is practiced sector in the same way as for the first.
  • the templates receive, in addition to the elements already described, gauges 29 making it possible to control the pressure on the blanket as well as the lining and millimeter scales 30, 31 and 32.
  • the gauges 29 are arranged differently on each of the four output templates that the gauges of each template leave a distinct imprint on the blanket.
  • the millimeter scales each have their own function.
  • Ladders 30 and 31 are arranged on the master template (fig. 7).
  • the origin of the scale 30 is placed on the blanket end line which is determined by the straight edge 13 of the alignment bars 9 and 11. As mentioned above, the blanket is longer than the development of the proof piece.
  • the scale 30 is printed from the master template on the additional part 24 of the blanket (fig. 3). Reading the reported scale 30 gives the exact indication of the length of the additional part 24 which will have to be deleted. This indication makes it possible to adjust the blanket holder sector 33 so that the real end X of the blanket coincides with the ideal end Y determined by the straight edge 13 of the alignment bars 9 and 11.
  • the second millimeter scale 31 (fig.
  • a millimeter scale 32 is arranged (fig. 8). It was originally carried over from scale 31; its axis is parallel to the axis AA '.
  • the ladder 31 extends over the entire length of the master template, because it often happens that the sectors of a machine are in a totally desynchronized phase.
  • the scale 32 printed by the second template for example can be found both on the far left and on the far right of the imprint left by the master template on the blanket.
  • the measurement of the correction to be made can be read directly at the point of intersection between the scale 31 and the scale 32.
  • the correction in development, ie the synchronization of the sectors, can be read on the scale 31; the correction affecting the height positioning of the template on the sector can be read on the scale 32.
  • the assembly formed by the scales 31 of the master template and 32 of each of the three other templates has the same function as the locating crosses 2 , but occurs when the amplitude of the corrections is greater.
  • the machine When the machine is preset, that is to say when the axes AA 'and BB' have been traced on the four sectors, the machine is ready to receive the working shots and to start the serial printing of the parts.
  • the setting in machine of the sets of stereotypes is summarized for the operator to check the coincidence of the axes AA 'and BB' traced on the sector with the axes AA 'and BB' engraved on the stereotype (fig. 6e).
  • the operator just has to adjust the picture by the play of the fixing bars 34 (fig. 6) by bringing the axes in superposition.
  • the machine preset allows different formats to be used; in fact, the axis AA 'being close to the attachment margin 3, whatever the size of the plate, it is possible to punch two holes revealing the axis AA'. Regarding the axis BB ', it will be halfway up if the picture is large, it will be at the top of the picture if it is small.
  • the advantage of the present invention compared to already known solutions is that it succeeds in moving the adjustment moment to a certain extent, or more precisely in dividing the adjustment into two distinct stages.
  • the first step is to preset the machine. This is a little longer than the setting as it is usually practical, but it has the merit of deploying a permanent effect, and therefore does not have to be repeated.
  • the second step closely dependent on the first, consists in shifting the timing of the adjustment of the plate on the sector or, more precisely, in presetting it so that the adjustment in machine is limited to a simple control, thus eliminating the groping which immobilizes the machine too much.
  • the already known systems also try to shift the timing of the adjustment, but, in addition to their uncertain functioning, they have the handicap of asking for total precision in an operation (the perforation of the pictures) which is precisely that which is least suitable for it.
  • the present invention requires the same precision of an operation which lends itself perfectly to it (copying the matrix film) whereas the perforations used are made with relative precision without any resulting disadvantage.

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  • Mechanical Engineering (AREA)
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  • Control Of Motors That Do Not Use Commutators (AREA)
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Abstract

A process for presetting a dry offset printing machine intended for printing cylindrical or conical workpieces, in which presetting templates are prepared from a matrix film which is also used for producing the working blocks and perform the function of permanently setting the machine so that the subsequent introduction of blocks merely requires simple checking.

Description

La présente invention concerne un procédé de préréglage d'une machine offset à sec destinée à l'impression de pièces cylindriques ou coniques. De très nombreux produits sont présentés dans des récipients cylindriques ou coniques, ainsi par exemple dans le domaine des cosmétiques, on utilise des tubes aérosols et des pots. Les tubes de collé, les pots de yoghourt et les peintures en spray en sont d'autres exemples. La décoration ou les indications qui figurant sur ces récipients sont imprimés au moyen de machines offset à sec. Ces machines sont d'un coût assez élevé, aussi convient-il de les utiliser de manière quasi continue pour les amortir. Cela est encore plus impératif lorsque l'impression est réalisée par une machine intégrée à une ligne complète de fabrication dans laquelle les pièces sont façonnées, imprimées, séchées, subissent un usinage final et sont même quelquefois remplies et emballées. Dans de telles lignes de production, tout arrêt présente une perte considérable. Or, il faut bien arrêter la ligne au moment de changer les clichés pour entamer une nouvelle série de pièces aux motifs différents. Vu le coût d'immobilisation de la machine, le temps consacé à la mise en place et au réglage d'un nouveau jeu de clichés doit être réduit au minimum. Cette préoccupation se retrouve d'ailleurs dans d'autres domaines où l'impression intervient et a donné lieu à de nombreuses tentatives. Il existe ainsi diverses solutions qui sont exposées notamment dans des documents de brevets. La plupart de ces solutions obéissent à un même principe: combiner l'opération de fixation ou d'accrochage du cliché sur le secteur porte-cliché avec l'opération de réglage des clichés entre eux. L'application de ce principe se traduit en général par l'aménagement dans le cliché de perforations dans lesquelles des ergots ou des griffes d'accrochage solidaires du secteur viennent se loger puis tendent et mettent en place le cliché sur le secteur.The present invention relates to a method for presetting a dry offset machine intended for printing cylindrical or conical parts. Many products are presented in cylindrical or conical containers, so for example in the field of cosmetics, aerosol tubes and jars are used. Glue tubes, yogurt jars and spray paints are other examples. The decoration or the indications which appear on these containers are printed by means of dry offset machines. These machines are quite expensive, so it is advisable to use them almost continuously to amortize them. This is even more imperative when the printing is carried out by a machine integrated into a complete production line in which the parts are shaped, printed, dried, undergo a final machining and are even sometimes filled and packaged. In such production lines, any downtime presents a considerable loss. However, it is necessary to stop the line when changing the shots to start a new series of pieces with different patterns. Given the cost of immobilizing the machine, the time spent setting up and adjusting a new set of plates should be kept to a minimum. This concern is also found in other areas where printing intervenes and has given rise to numerous attempts. There are thus various solutions which are exposed in particular in patent documents. Most of these solutions obey the same principle: combine the operation of fixing or hanging the plate on the plate holder sector with the operation of adjusting the plates between them. The application of this principle generally results in the arrangement in the plate of perforations in which lugs or hooking claws secured to the sector are housed and then tend and place the plate on the sector.

Dans le procédé d'impression décrit par le document GB-A-871 664, les marges de l'aire imprimée de la pièce-épreuve transparente correspondant à une plaque d'impression ou cliché de travail sont alignées avec des lignes- repères tracées sur un gabarit et des lignes de coordonnées centrales sont tracées sur cette pièce-épreuve transparente dans le prolongement des lignes de coordonnées centrales également inscrites sur le gabarit. Ensuite, la pièce-épreuve transparente est positionnée sur un dispositif de perforation à l'aide de ces lignes de coordonnées centrales et deux trous d'emplacement déterminé par rapport à ces lignes y sont perforés, ce qui permet de positionner la pièce-épreuve sur le dispositif cylindrique de fixation de la plaque d'impression à l'aide de deux ergots portés par ce dispositif, puis d'ajuster la position de la plaque d'impression, placée sur le dispositif en-dessous de la pièce-épreuve transparente, en déplaçant cette plaque d'impression pour faire coïncider son image imprimée avec celle de la pièce épreuve.In the printing process described in GB-A-871 664, the margins of the printed area of the transparent proof piece corresponding to a printing plate or working plate are aligned with reference lines drawn on a template and central coordinate lines are drawn on this transparent test piece as an extension of the central coordinate lines also written on the template. Then, the transparent test piece is positioned on a perforation device using these central coordinate lines and two holes of location determined with respect to these lines are perforated there, which makes it possible to position the test piece on the cylindrical device for fixing the printing plate using two lugs carried by this device, then adjusting the position of the printing plate, placed on the device below the transparent test piece, by moving this printing plate to make its printed image coincide with that of the proof piece.

Dans ce procédé comme dans les autres solutions déjà connues, la précision du réglage en machine est tributaire de la précision avec laquelle les perforations ont été pratiquées ainsi que de l'ajustage exact des ergots ou griffes à la forme des perforations. Cette précision est limitée par les caractéristiques nécessaires du matériau utilisé pour confectionner les clichés, ainsi que par la difficulté de réaliser des griffes à la fois mobiles et n'ayant cependant aucun jeu. Dans la pratique, ces systèmes sont peu utilisés car ils ne donnent pas pleine satisfaction. Le réglage des clichés en machine est donc réalisé la plupart du temps par tâtonnements, la durée de l'opération dépendant alors de l'habileté ou de la chance du conducteur de la machine. Pour une machine à quatre couleurs, ayant par conséquent quatre secteurs sur lesquels quatre clichés sont montés, le temps de réglage est d'environ deux heures. C'est dans le dessein de ramener ce temps de réglage à environ quinze minutes que la présente invention a été faite.In this process as in the other already known solutions, the precision of the adjustment in machine depends on the precision with which the perforations were practiced as well as on the exact adjustment of the pins or claws to the shape of the perforations. This precision is limited by the necessary characteristics of the material used to make the plates, as well as by the difficulty of making claws which are both mobile and which however have no play. In practice, these systems are little used because they do not give not full satisfaction. The machine shots are therefore adjusted most of the time by trial and error, the duration of the operation then depending on the skill or luck of the machine operator. For a four-color machine, therefore having four sectors on which four plates are mounted, the setting time is approximately two hours. It is with the intention of reducing this adjustment time to approximately fifteen minutes that the present invention was made.

Expose de l'inventionExhibition of the invention

Le procédé de l'invention utilise, de façon analogue à l'art antérieur, des axes repères et des croix de référence. Dans le procédé de l'invention, deux axes repères et des croix de référence sont reproduits sur tous les gabarits et clichés qui sont tirés d'un film-matrice de base sur lequel on a gravé ces axes et ces croix. Le report des axes repères de chaque gabarit sur le secteur correspondant, une fois la position de ce gabarit réglé, permettra ensuite le réglage rapide et précis de la position des clichés. Le tracé des axes repères sur les secteurs et le réglage des clichés se font grâce à des perforations des gabarits et des clichés, non pas utilisées en elles-mêmes comme un moyen de positionnement comme cela est connu de l'art antérieur, mais comme fenêtres. En effet, on trace sur chaque secteur porte-cliché des portions d'axes à travers les perforations du gabarit correspondant réglé en position, et ensuite on aligne les axes de chaque cliché avec les portions d'axes du secteur visibles à travers les perforations de ces clichés. Le centrage et le positionnement des perforations sur les axes n'ont pas besoin d'être précis car ils n'influencent pas le positionnement des secteurs porte-clichés ou des clichés.The method of the invention uses, analogously to the prior art, reference axes and reference crosses. In the method of the invention, two reference axes and reference crosses are reproduced on all the templates and clichés which are taken from a basic matrix film on which these axes and these crosses have been engraved. The transfer of the reference axes of each template to the corresponding sector, once the position of this template has been set, will then allow quick and precise adjustment of the position of the pictures. The layout of the reference axes on the sectors and the adjustment of the photographs are made by means of perforations of the templates and photographs, not used in themselves as a means of positioning as is known from the prior art, but as windows . Indeed, on each plate holder sector, portions of axes are traced through the perforations of the corresponding template adjusted in position, and then the axes of each photograph are aligned with the sector portions of axes visible through the perforations of these shots. The centering and positioning of the perforations on the axes need not be precise because they do not influence the positioning of the plate-carrying sectors or of the plates.

Outre cette utilisation particulière de perforations, le procédé de l'invention se distingue de l'art antérieur par l'utilisation d'essais d'impression pour le réglage précis du maître-gabarit et des autres gabarits sur les secteurs correspondants.In addition to this particular use of perforations, the method of the invention differs from the prior art by the use of printing tests for the precise adjustment of the master template and the other templates on the corresponding sectors.

Le réglage de la position du maître-gabarit sur le secteur porte-cliché correspondant est ainsi effectué à l'aide d'essais d'impression avec le blanchet et avec une pièce-épreuve: des barres d'alignement portées par le maître-gabarit déposent alors des images sur le blanchet, ces images sont la source d'images déposées sur la pièce-épreuve puis redéposées par celle-ci sur le blanchet, et les défauts d'alignement de ces images redéposées par rapport aux images déposées sur le blanchet par les barres du maître-gabarit permettent de régler la position de ce maître-gabarit.The adjustment of the position of the master template on the corresponding plate holder sector is thus carried out using printing tests with the blanket and with a test piece: alignment bars carried by the master template then deposit images on the blanket, these images are the source of images deposited on the proof-piece then redeposited by it on the blanket, and the misalignment of these redeposited images with respect to the images deposited on the blanket by the bars of the master jig allow the position of this master jig to be adjusted.

Les positions des autres gabarits sur leurs secteurs respectifs sont ensuite réglées plus simplement à l'aide d'essais d'impression avec le blanchet sans pièce-épreuve, en comparant les positions des images des croix de référence déposées sur le blanchet par le gabarit à régler et par le maître-gabarit déjà réglé.The positions of the other templates on their respective sectors are then adjusted more simply by means of printing tests with the blanket without proof-piece, by comparing the positions of the images of the reference crosses deposited on the blanket by the template to set and by the master template already set.

Le traçage des axes sur chaque secteur suit le réglage du gabarit correspondant en traçant des portions d'axes à travers les perforations du gabarit comme déjà indiqué, puis en traçant les axes reliant ces portions après avoir enlevé le gabarit.The tracing of the axes on each sector follows the adjustment of the corresponding template by tracing portions of axes through the perforations of the template as already indicated, then by tracing the axes connecting these portions after removing the template.

Comme cela est décrit dans l'exemple qui suit, on peut utiliser de façon auxiliaire des échelles graduées, soit pour ajuster la longueur du porte-blanchet, soit en complément pour régler plus facilement les problèmes de désynchronisation des secteurs de la machine offset.As described in the following example, it is possible to use graduated scales in an auxiliary manner, either to adjust the length of the blanket holder, or in addition to more easily resolve the problems of desynchronization of the sectors of the offset machine.

Un procédé comme decrît dans le preambule de la revendication 1 est connû du fascicule FR-A-2312373.A process as described in the preamble of claim 1 is known from the specification FR-A-2312373.

Le procédé de réglage de la machine et de réglage des clichés de travail sur une telle machine comprend selon l'invention des opérations ou étapes de préparation des films, gabarits et clichés utilisés (étapes a) à f)), puis des étapes de réglage g) à i). Les opérations ou étapes de préparation sont:The method of adjusting the machine and adjusting the working plates on such a machine comprises, according to the invention, operations or steps for preparing the films, templates and plates used (steps a) to f)), then adjustment steps g) to i). The operations or stages of preparation are:

  • a) on utilise d'abord un film-matrice de base, en gravant sur un film des croix de référence ainsi que deux axes AA' et BB' sensiblement perpendiculaires, l'un des axes AA' étant orienté de telle sorte que son image sur les gabarits soit parallèle à l'axe de rotation du secteur porte-cliché sur lequel ce gabarit sera monté;a) a basic matrix film is first used, by engraving on a film reference crosses as well as two axes AA 'and BB' substantially perpendicular, one of the axes AA 'being oriented so that its image on the templates is parallel to the axis of rotation of the plate holder sector on which this template will be mounted;
  • b) on prépare un film-matrice enrichi, en disposant sur une copie du film-matrice de base des barres d'alignement parallèles à l'axe AA', barres dont les images sur le maître-gabarit marqueront de préférence pour les unes le début du développé de la pièce sur laquelle s'effectuera l'impression, pour les autres la fin du blanchet;b) an enriched matrix film is prepared, by placing on a copy of the basic matrix film alignment bars parallel to the axis AA ', bars whose images on the master template will preferably mark the beginning of the development of the piece on which the printing will take place, for others the end of the blanket;
  • c) on tire un maître-gabarit à partir du film-matrice enrichi et on dispose éventuellement sur ce maître-gabarit des échelles d'ajustement;c) a master template is drawn from the enriched matrix film and optionally there are adjustment scales on this master template;
  • d) on tire les autres gabarits à partir du film-matrice de base et on dispose éventuellement sur chacun d'eux une échelle d'ajustement;d) the other templates are drawn from the base matrix film and an adjustment scale is optionally available on each of them;
  • e) on réalise quatre perforations de la même façon et à peu près aux mêmes endroits sur chacun des gabarits (maître-gabarit et autres gabarits) dont deux perforations sur l'axe AA' en haut et en bas de chaque gabarit, et deux perforations sur l'axe BB';e) four perforations are made in the same way and in approximately the same places on each of the templates (master template and other templates) including two perforations on the axis AA 'at the top and bottom of each template, and two perforations on the axis BB ';
  • f) on prépare chaque cliché de travail à partir d'une copie du film-matrice de base, en effectuant sur cette copie des perforations disposées comme sur les gabarits, et en gravant au voisinage de ces perforations les images des axes AA' et BB' figurant sur ladite copie.f) each working plate is prepared from a copy of the base matrix film, by making perforations on this copy arranged as on the templates, and by engraving in the vicinity of these perforations the images of the axes AA 'and BB 'appearing on said copy.

Le réglage de la machine consiste alors en un réglage du maître-gabarit (étape g)) et en des réglages des autres gabarits (étapes h)) au moyen d'essais d'impression de deux types, puis en le gravage des axes repères AA' et BB' sur les secteurs correspondants en utilisant les perforations des gabarits réglés (étape i)):

  • g) le maître-gabarit est fixé sur le premier secteur porte-cliché, encré, puis on effectue une passe d'impression avec le blanchet et une pièce-épreuve. Pour régler la position du maître-gabarit, on vérifie la position des images de deux barres d'alignement redéposées sur le blanchet par les images desdites barres imprimées par le blanchet sur la pièce-épreuve, en la comparant à la position des images de ces barres déposées en premier sur le blanchet par le maître-gabarit;
  • h) on place ensuite un gabarit sur chaque autre secteur porte-cliché on l'encre et on fait une passe avec le blanchet, sans pièce-épreuve. Puis on adjuste la position de chaque gabarit en faisant coïncider les images de ses croix de référence sur le blanchet avec les images des mêmes croix déposées sur le blanchet par le maître-gabarit dont la position a été ajustée en g). On utilise éventuellement les images des échelles d'ajustement déposées sur le blanchet, pour le réglage de la fin réelle du blanchet, et/ou pour régler la synchonisation des secteurs et le positionnement en hauteur des gabarits sur les secteurs, comme cela est expliqué dans l'exemple qui suit;
  • i) une fois le réglage de chaque gabarit effectué sur la secteur correspondant, qu'il s'agisse du maître-gabarit réglagé selon g) ou des autres gabarits réglés ensuite selon h), chaque secteur est marqué, habituellement par gravage, au travers des perforations du gabarit avec des repères ou portions d'axes alignés avec l'axe AA' d'un part et avec l'axe BB' d'autre part. Puis, on enlevè le gabarit du secteur, et on complète le tracé des axes AA' et BB' sur le secetur en reliant les repères précédents.
The adjustment of the machine then consists of an adjustment of the master template (step g)) and of settings of the other templates (steps h)) by means of two types of printing tests, then by engraving the reference axes. AA 'and BB' on the corresponding sectors using the perforations of the adjusted templates (step i)):
  • g) the master template is fixed to the first plate holder sector, inked, then a printing pass is made with the blanket and a proof piece. To adjust the position of the master gauge, the position of the images of two alignment bars redeposited on the blanket is checked by the images of said bars printed by the blanket on the test piece, by comparing it to the position of the images of these bars first deposited on the blanket by the master jig;
  • h) a template is then placed on each other plate holder sector, ink and a pass is made with the blanket, without proof piece. Then the position of each template is adjusted by making the images of its reference crosses on the blanket coincide with the images of the same crosses deposited on the blanket by the master template whose position has been adjusted in g). The images of the adjustment scales deposited on the blanket are optionally used, for adjusting the actual end of the blanket, and / or for adjusting the synchronization of the sectors and the height positioning of the templates on the sectors, as explained in the following example;
  • i) once the adjustment of each template has been made on the corresponding sector, whether it is the master template adjusted according to g) or the other templates then adjusted according to h), each sector is marked, usually by engraving, through perforations of the template with marks or portions of axes aligned with the axis AA 'on the one hand and with the axis BB' on the other hand. Then, remove the template from the sector, and complete the layout of the axes AA 'and BB' on the secetur by connecting the previous marks.

Le préréglage de la machine est alors terminée, et les réglages de clichés peuvent ensuite se faire simplement:

  • j) chaque cliché de travail est ensuite positionné une son secteur porte-cliché en alignnant les portions des axes AA' et BB' gravées au voisinage des perforations dudit cliché, avec les axes AA' et BB' gravés sur le secteur.
The machine preset is then finished, and the snapshot settings can then be done simply:
  • j) each working plate is then positioned in a plate holder sector by aligning the portions of the axes AA 'and BB' engraved in the vicinity of the perforations of said plate, with the axes AA 'and BB' engraved on the sector.

La solution selon l'invention est définie dans la revendication 1.The solution according to the invention is defined in claim 1.

Exemple et commentairesExample and comments

Le procédé est décrit ci-dessous en détail dans le cas d'une machine offset à sec à quatre couleurs.

  • La figure 1 montre un gabarit de préréglage
  • La figure 2 montre le maître gabarit
  • La figure 3 montre une vue d'un secteur porte-blanchet et d'une pièce-épreuve
  • La figure 4 montre une vue du marquage d'un secteur
  • La figure 4b montre une vue du guide de marquage
  • La figure 5 montre une vue d'un secteur sur lequel des axes sont tracés
  • La figure 6 montre une vue d'un cliché de travail (ou d'un gabarit) lors de la mise en position sur un secteur
  • La figure 6e montre l'apparition par une perforation de l'axe tracé sur un secteur
  • La figure 7 montre une variante enrichie du maître-gabarit et
  • La figure 8 montre une variante enrichie d'un gabarit.
The process is described below in detail in the case of a four-color dry offset machine.
  • Figure 1 shows a preset template
  • Figure 2 shows the master template
  • Figure 3 shows a view of a blanket area and a test piece
  • Figure 4 shows a view of the marking of a sector
  • Figure 4b shows a view of the marking guide
  • Figure 5 shows a view of a sector on which axes are drawn
  • Figure 6 shows a view of a working plate (or a template) when positioning on a sector
  • Figure 6e shows the appearance by a perforation of the axis traced on a sector
  • FIG. 7 shows an enriched variant of the master template and
  • Figure 8 shows an enriched variant of a template.

La figure 3 ne montre pas l'image imprimée sur le blanchet telle qu'elle se présente en réalité, en effet, les gabarits étant gravés en positif, ils sont "lisibles", ce que a pour conséquence que le blanchet est "illisible" puisque l'image est inversée. Dans le dessin, on a volontairement ignoré cette inversion pour que le lecteur retrouve les divers éléments dans la même disposition dans toutes les figures.Figure 3 does not show the image printed on the blanket as it actually appears, in fact, the templates being engraved in positive, they are "readable", which has the consequence that the blanket is "unreadable" since the image is reversed. In the drawing, this inversion has been deliberately ignored so that the reader finds the various elements in the same arrangement in all the figures.

Comme on le voit à la fig. 1, le gabarit de préréglage est un cliché mince, identique à ceux utilisés usuellement en offset à sec. Le gabarit 1 est réalisé selon le même processus qu'un cliché de travail. Les divers éléments qui apparaissent sur le gabarit dans les figures sont d'abord disposés sur un film lith- orthochromatique permettant la copie sur plaques photopolymères, les plaques étant ensuite plongées dans un bain de lavage créant le relief.As seen in fig. 1, the preset template is a thin plate, identical to those usually used in dry offset. The template 1 is produced according to the same process as a working plate. The various elements that appear on the template in the figures are first arranged on a lithorthochromatic film allowing copying on photopolymer plates, the plates then being immersed in a washing bath creating the relief.

Dans la description qui suit, les divers éléments gravés participant à l'invention sont décrits tels qu'ils apparaissent sur le cliché réalisé. Les opérations qui permettent de réaliser le film, et de graver ensuite les plaques sont une technique bien connue des hommes du métier et ne sont pas décrites ici.In the following description, the various engraved elements participating in the invention are described as they appear on the photograph produced. The operations which make it possible to produce the film, and then to engrave the plates are a technique well known to those skilled in the art and are not described here.

Des croix de repérage 2 usuelles en photogravure sont disposée sur un film. On ajoute deux axes AA' et BB'. L'axe AA' est disposé parallèlement à l'axe de rotation du secteur porte-cliché sur lequel le gabarit sera fixé dans une étape ultérieure. L'axe AA' est situé à proximité de la marge d'accrochage droite 3 du gabarit. Sa position plus ou moins rapprochée de ladite marge ne joue pas de rôle. Le deuxième axe BB' est ensuite disposé perpendiculairement à l'axe AA' dans la variante présentée. La direction de l'axe BB' n'est cependant pas nécessairement perpendiculaire à l'axe AA', mais il est préférable que les deux axes forment entre eux un angle compris entre 80 et 100°. Le film portant les croix de repérage 2 et les axes AA' et BB' constitue une matrice de base. Sur une copie de cette matrice, on dispose ensuite (fig. 2) quatre barres d'alignment 8, 9, 10 et 11 rigoureusement parallèles à l'axe AA', donc à l'axe de rotation du secteur porte-cliché. Ces barres ont une largeur de 5 mm et une longueur de 35 mm dans la variante représentée. Les deux barres de droite 9 et 11 sont placées à une distance du bord droit 12 du cliché qui varie selon la machine sur laquelle les clichés auront à travailler. Pour une machine du type W1FAG, la distance qui sépare le bord droit 12 du cliché du bord droit 13 des barres 9 et 11 est fixée à 40 mm. Le sommet 14 de la barre 9 est disposé à 25 mm du haut du cliché 15. La base 16 de la barre 11 est située à 25 mm du bas du cliché 17. Les deux barres de gauche 8 et 10 ont les mêmes dimensions que les deux barres de droite. Leur positionnement sur le cliché tient compte de deux facteurs. Premièrement, leur position est déterminée par deux perpendiculaires à l'axe AA'. L'une d'elles est élevée par le sommet 14 de la barre supérieure droite 9. Le sommet 18 de la barre 8 est aligné sur cette perpendiculaire. De la même façon, on aligne la base 16 de la barre 11 et la base 19 de la barre 10 sur une même perpendiculaire à l'axe AA'. Secondement, la distance qui sépare le côté droit 13 des deux barres de droite 9 et 11 du côté gauche 20 des deux barres de gauche 8 et 10 est déterminée par le développement des pièces sur lesquelles l'impression aura finalement lieu. Les diamètres usuels des pièces qui sont imprimées au moyen de clichés du format représenté sont 35, 40 et 45 mm. Les développements de ces pièces sont donc respectivement de 109,2 mm, 124,8 mm et 140,4 mm. Dans la variante représentée à la fig. 2, la distance est de 124,8 mm et correspond ainsi à une pièce de 40 mm de diamètre. Il est aussi envisagé de faire figurer sur un même gabarit les barres correspondant à plusieurs développements (fig. 7). Le nombre de gabarits qui doivent être gravés dépend du nombre de groupes couleur que comporte la machine. Pour une presse offset à sec à quatre groupes couleur, quatre gabarits sont réalisés. Le premier de ces quatre gabarits, le maître-gabarit 100 qui correspond au premier secteur, comporte tous les éléments décrits jusqu'ici, à savoir les croix de reprérage 2, les axes de positionnement AA' et BB' et les barres d'alignement 8,9,10 et 11 (fig. 2). Les trois autres gabarits sont identiques l'un à l'autre, mais ne comportent que les croix 2 et les axes AA' et BB' (fig. 1). Une fois les quatre gabarits réalisés, on pratique sur chacun d'eux quatre perforations. Les quatre perforations sont positionnées de la même façon et aux mêmes endroits sur chaque gabarit. On pratique, centrées sur l'axe AA', deux perforations 4 et 6 d'un diamètre de l'ordre de 5 à 10 mm, l'une des perforations 4 pratiquée dans le haut du cliché, l'autre 6 dans le bas. Ces perforations sont circulaires dans le dessin, mais on envisage également d'autres formes, notamment oblongues, carrées ou triangulaires. Deux autres perforations sont ensuite pratiquées sur l'axe BB', l'une 5 sur la droite du gabarit et centrée à la fois sur l'axe BB' et sur l'axe AA'. Cette perforation est également prévue à l'écart de l'axe AA', mais la variante représentée aux fig. 1 et 2 permet d'avoir par la suite un troisième repère 5 qui vient s'ajouter aux deux perforations 4 et 6 de l'axe AA' déjà décrites. Une deuxième perforation 7 est pratiquée sur l'axe BB', mais sur la gauche du gabarit cette fois. Les quatre gabarits sont ensuite cintrés jusqu'à une courbure à peine plus ouverte que celle des secteurs sur lesquels les gabarits seront montés. Une fois les gabarits perforés et cintrés, ils sont montés en machine. Le préréglage de la machine peut alors être effectué. Le préréglage débute par le positionnement du maître-gabarit sur le premier groupe couleur de la machine. Le maître-gabarit 100 est celui qui possède les barres d'alignement 8, 9, 10 et 11 en plus des croix 2 et des axes AA' et BB'. On fixe le maître-gabarit sur le secteur correspondant au premier groupe. On place ensuite une pièce-épreuve 21 sur le mandrin porte-pièce 22 (fig. 3). Après encrage du gabarit, on effectue un passage avec le blanchet 23. L'encre se reporte du gabarit sur le blanchet 23 puis, de celui-ci, sur la pièce-épreuve 21. A ce stade la fin du blanchet 23 n'est pas encore ajustée et une partie supplémentaire 24 dépasse. De ce fait, le blanchet 23 est en contact avec la pièce-épreuve 21 sur une longueur développée plus grande que le développement de la pièce. Il en résulte que l'encre que le blancher 23 a déposé sur la pièce-épreuve 21 est redéposée, après que la pièce ait effectué un tour complet, sur la partie supplémentaire du blanchet.Usual locating crosses 2 in photoengraving are placed on a film. Two axes AA 'and BB' are added. The axis AA ′ is arranged parallel to the axis of rotation of the plate-holding sector on which the template will be fixed in a subsequent step. The axis AA 'is located near the right hooking margin 3 of the template. Its position more or less close to said margin does not play a role. The second axis BB 'is then arranged perpendicular to the axis AA' in the variant presented. The direction of the axis BB 'is not, however, necessarily perpendicular to the axis AA', but it is preferable that the two axes form an angle between 80 and 100 ° between them. The film carrying the locating crosses 2 and the axes AA 'and BB' constitutes a basic matrix. On a copy of this matrix, we then have (fig. 2) four alignment bars 8, 9, 10 and 11 rigorously parallel to the axis AA ', therefore to the axis of rotation of the plate-holder sector. These bars have a width of 5 mm and a length of 35 mm in the variant shown. The two right bars 9 and 11 are placed at a distance from the right edge 12 of the plate which varies according to the machine on which the plates will have to work. For a machine of the W1FAG type, the distance which separates the right edge 12 of the plate from the right edge 13 of the bars 9 and 11 is fixed at 40 mm. The top 14 of the bar 9 is arranged 25 mm from the top of the plate 15. The base 16 of the bar 11 is located 25 mm from the bottom of the plate 17. The two left bars 8 and 10 have the same dimensions as the two bars on the right. Their positioning on the photograph takes into account two factors. First, their position is determined by two perpendicular to the axis AA '. One of them is raised by the vertex 14 of the right upper bar 9. The vertex 18 of the bar 8 is aligned on this perpendicular. In the same way, the base 16 of the bar 11 and the base 19 of the bar 10 are aligned on the same perpendicular to the axis AA '. Secondly, the distance which separates the right side 13 of the two right bars 9 and 11 from the left side 20 of the two left bars 8 and 10 is determined by the development of the parts on which the printing will finally take place. The usual diameters of the parts which are printed by means of plates of the format shown are 35, 40 and 45 mm. The developments of these parts are therefore respectively 109.2 mm, 124.8 mm and 140.4 mm. In the variant shown in FIG. 2, the distance is 124.8 mm and thus corresponds to a part 40 mm in diameter. It is also envisaged to include on the same template the bars corresponding to several developments (fig. 7). The number of templates that must be engraved depends on the number of color groups in the machine. For a dry offset press with four color groups, four templates are produced. The first of these four templates, the master template 100 which corresponds to the first sector, includes all the elements described so far, namely the cross marks 2, the positioning axes AA 'and BB' and the alignment bars. 8,9,10 and 11 (fig. 2). The other three templates are identical to each other, but only have crosses 2 and axes AA 'and BB' (fig. 1). Once the four templates have been made, four perforations are made on each of them. The four perforations are positioned in the same way and in the same places on each template. We practice, centered on the axis AA ', two perforations 4 and 6 with a diameter of the order of 5 to 10 mm, one of the perforations 4 made in the top of the plate, the other 6 in the bottom . These perforations are circular in the drawing, but other shapes are also envisaged, in particular oblong, square or triangular. Two other perforations are then made on the axis BB ', one 5 on the right of the template and centered both on the axis BB' and on the axis AA '. This perforation is also provided away from the axis AA ′, but the variant shown in FIGS. 1 and 2 makes it possible thereafter to have a third reference 5 which is added to the two perforations 4 and 6 of the axis AA 'already described. A second perforation 7 is made on the axis BB ', but on the left of the template this time. The four templates are then bent to a barely more open curvature than that of the sectors on which the templates will be mounted. Once the templates are perforated and bent, they are machine mounted. Machine presetting can then be carried out. The presetting begins with the positioning of the master template on the first color group of the machine. The master jig 100 is the one which has the alignment bars 8, 9, 10 and 11 in addition to the crosses 2 and the axes AA 'and BB'. The master template is fixed on the sector corresponding to the first group. A test piece 21 is then placed on the workpiece mandrel 22 (fig. 3). After inking the template, a passage is made with the blanket 23. The ink is transferred from the template to the blanket 23 then, from the latter, to the test piece 21. At this stage the end of the blanket 23 is not not yet adjusted and an additional part 24 protrudes. Therefore, the blanket 23 is in contact with the test piece 21 over a developed length greater than the development of the piece. As a result, the ink that the blancher 23 deposited on the proof piece 21 is redeposited, after the piece has completed a full turn, on the additional part of the blanket.

Comme le montre la fig. 3, les premiers motifs déposés par le blanchet sont les barres 8 et 20, celles-ci sont imprimées 8' et 10' sur la pièce 21 puis redéposées sur le blanchet 8" et 10". On vérifie alors que le sommet 18" de la barre 8" est bien aligné à la même hauteur que le sommet 14 de la barre 9 qui marque la fin du blanchet. On vérifie également l'alignement de la base 19" de la barre 10" avec la base 16 de la barre 11. Si les sommets 18" et 14 et les bases 19" et 16 ne sont pas alignés, on ajuste le maître-gabarit 100 sur le secteur par le jeu des barrettes de fixation 34 (fig. 6) jusqu'à obtention dudit alignement. Lorsque l'alignement est obtenu, on a la démonstration que l'axe AA' ainsi que les barres d'alignement 8, 9, 10 et 11 sont bien orientées parallèlement à l'axe de rotation du secteur.As shown in fig. 3, the first patterns deposited by the blanket are the bars 8 and 20, these are printed 8 'and 10' on the piece 21 then redeposited on the blanket 8 "and 10". It is then checked that the top 18 "of the bar 8" is aligned at the same height as the top 14 of the bar 9 which marks the end of the blanket. We also check the alignment of the base 19 "of the bar 10" with the base 16 of the bar 11. If the vertices 18 "and 14 and the bases 19" and 16 are not aligned, we adjust the master template 100 on the sector by the set of fixing bars 34 (fig. 6) until said alignment is obtained. When the alignment is obtained, we have the demonstration that the axis AA 'as well as the alignment bars 8, 9, 10 and 11 are well oriented parallel to the axis of rotation of the sector.

Selon que la machine offset tourne dans le sens de la marche des aiguilles d'une montre (Type WIFAG) (fig. 3) ou dans le sens inverse, la fin du blanchet se trouvera sur la droite ou sur la gauche, dans ce cas, toutes les positions des éléments ci-dessus sont simplement inversées.Depending on whether the offset machine rotates clockwise (WIFAG type) (fig. 3) or counterclockwise, the end of the blanket will be on the right or left, in this case , all the positions of the above elements are simply reversed.

Le maître-gabarit 100 étant correctement positionné sur le premier secteur, on procède au marquage du secteur (fig. 4) au moyen d'un stylet en traçant deux repères alignés sur l'axe AA' par les perforations 4 et 6 et deux autres repères alignés sur l'axe BB' par les perforations 5 et 7.The master template 100 being correctly positioned on the first sector, the sector is marked (fig. 4) by means of a stylus by tracing two marks aligned on the axis AA 'by the perforations 4 and 6 and two others marks aligned on the axis BB 'by the perforations 5 and 7.

Pour effectuer le marquage, on utilise soit un stylet simple 25 (fig. 4) soit un stylet monté sur un guide 26 (fig. 4a). Dans ce dernier cas, le guide possède une fraisure 28 qui épouse le relief de l'axe 28 et conduit le stylet en coulissant sur le rail formé par le relief de l'axe.To mark, use either a simple stylus 25 (fig. 4) or a stylus mounted on a guide 26 (fig. 4a). In the latter case, the guide has a countersink 28 which follows the relief of the axis 28 and drives the stylus by sliding on the rail formed by the relief of the axis.

Pour régler le groupe correspondant à la deuxième couleur, on place sur le deuxième secteur l'un des trois gabarits identiques représentés à la fig. 1. On effectue ensuite un passage sur le blanchet, mais sans faire intervenir une pièce-épreuve cette fois. Le maître-gabarit 100 qui est monté sur le premier secteur dépose ses motifs, notamment les croix de repérage 2 sur le blanchet comme dans la fig. 3. Le deuxième gabarit 1 dépose à son tour ses motifs, tels que représentés à la fig. 1 sur le blanchet. Le deuxième gabarit est alors ajusté sur le deuxième secteur jusqu'à ce que ses croix de repérage 2 coïncident exactement sur le blanchet aux croix 2 laissées par le maître-gabarit 100. Lorsque la coïncidence des croix est parfaite, on pratique le marquage du deuxième secteur de la même façon que pour le premier.To adjust the group corresponding to the second color, one of the three identical templates shown in fig. 1. We then pass over the blanket, but without using a proof piece this time. The master template 100 which is mounted on the first sector deposits its patterns, in particular the locating crosses 2 on the blanket as in FIG. 3. The second template 1 in turn deposits its patterns, as shown in FIG. 1 on the blanket. The second template is then adjusted on the second sector until its locating crosses 2 exactly coincide on the blanket with the crosses 2 left by the master template 100. When the coincidence of the crosses is perfect, the marking of the second is practiced sector in the same way as for the first.

L'opération décrite ci-dessus est répétée pour le troisième, puis pour le quatrième secteur. Les croix de repérage correspondant aux quatre groupes sont ainsi parfaitement superposées et les quatre secteurs sont marqués.The operation described above is repeated for the third, then for the fourth sector. The cross marks corresponding to the four groups are thus perfectly superimposed and the four sectors are marked.

On retire alors les quatre gabarits de la machine et l'on trace (fig. 5) sur chacun des secteurs les axes AA' et BB' en reliant les repères qui ont été marqués au travers des perforations 4, 5, 6 et 7 comme décrit plus haut. Chacun des secteurs porte dès lors les deux axes AA' et BB' comme le représente la fig. 5.We then remove the four templates from the machine and trace (fig. 5) on each of the sectors the axes AA 'and BB' by connecting the marks which have been marked through the perforations 4, 5, 6 and 7 as described above. Each of the sectors therefore carries the two axes AA 'and BB' as shown in FIG. 5.

Dans une variante enrichie (fig. 7 et 8), les gabarits reçoivent en plus des éléments déjà décrits, des jauges 29 permettant de contrôler la pression sur le blanchet ainsi que le doublage et des échelles millimétriques 30, 31 et 32. Les jauges 29 sont disposées différemment sur chacun des quatre gabarits de sortie que les jauges de chaque gabarit laissent une empreinte distincte sur le blanchet.In an enriched variant (FIGS. 7 and 8), the templates receive, in addition to the elements already described, gauges 29 making it possible to control the pressure on the blanket as well as the lining and millimeter scales 30, 31 and 32. The gauges 29 are arranged differently on each of the four output templates that the gauges of each template leave a distinct imprint on the blanket.

Les échelles millimétriques ont chacune une fonction propre. Les échelles 30 et 31 sont disposées sur le maître-gabarit (fig. 7). L'origine de l'échelle 30 est placée sur la ligne de fin de blanchet qui est déterminée par le bord droit 13 des barres d'alignement 9 et 11. Comme on l'a dit plus haut, le blanchet est plus long que le développement de la pièce-épreuve. L'échelle 30 est imprimée du maître-gabarit sur la partie supplémentaire 24 du blanchet (fig. 3). La lecture de l'échelle reportée 30 donne l'indication exacte de la longueur de la partie supplémentaire 24 qu'il faudra supprimer. Cette indication permet d'adjuster le secteur porte-blanchet 33 de façon que la fin réelle X du blanchet coïncide avec la fin idéale Y déterminée par le bord droit 13 des barres d'alignement 9 et 11. La deuxième échelle millimétrique 31 (fig. 7) est placée perpendiculairement à l'axe AA'. Son origine est placée dans la partie centrale du maître-gabarit, la position exacte ne joue pas de rôle. Cependant, lorsqu'elle aura été choisie, elle sera reportée exactement sur les trois autres gabarits 1 (fig. 8). L'échelle 31 est double en ce sens que la graduation se développe vers la droite et vers la gauche à partir de l'origine.The millimeter scales each have their own function. Ladders 30 and 31 are arranged on the master template (fig. 7). The origin of the scale 30 is placed on the blanket end line which is determined by the straight edge 13 of the alignment bars 9 and 11. As mentioned above, the blanket is longer than the development of the proof piece. The scale 30 is printed from the master template on the additional part 24 of the blanket (fig. 3). Reading the reported scale 30 gives the exact indication of the length of the additional part 24 which will have to be deleted. This indication makes it possible to adjust the blanket holder sector 33 so that the real end X of the blanket coincides with the ideal end Y determined by the straight edge 13 of the alignment bars 9 and 11. The second millimeter scale 31 (fig. 7) is placed perpendicular to the axis AA '. Its origin is placed in the central part of the master template, the exact position does not play a role. However, when it has been chosen, it will be transferred exactly to the other three templates 1 (fig. 8). The scale 31 is double in the sense that the graduation develops to the right and to the left from the origin.

Sur les trois autres gabarits 1, une échelle millimétrique 32 est disposée (fig. 8). Elle a pour l'origine reportée de l'échelle 31; son axe est parallèle à l'axe AA'.On the other three templates 1, a millimeter scale 32 is arranged (fig. 8). It was originally carried over from scale 31; its axis is parallel to the axis AA '.

L'échelle 31 se déploie sur toute la longueur du maître-gabarit, car il arrive fréquemment que les secteurs d'une machine soient dans une phase totalement desynchronisée. Dans ce cas, l'échelle 32 imprimée par le deuxième gabarit par exemple peut se trouver aussi bien sur l'extrême gauche que sur l'extrême droite de l'empreinte laissée par le maître-gabarit sur le blanchet. La mesure de la correction à apporter peut se lire directement à l'endroit d'intersection entre l'échelle 31 et l'échelle 32. La correction dans le développement, soit la synchronisation des secteurs, se lit sur l'échelle 31; la correction touchant le positionnement en hauteur du gabarit sur le secteur se lit sur l'échelle 32. L'ensemble formé par les échelles 31 du maître-gabarit et 32 de chacun des trois autres gabarits a la même fonction que les croix de repérage 2, mais intervient lorsque l'amplitude des correction est plus importante.The ladder 31 extends over the entire length of the master template, because it often happens that the sectors of a machine are in a totally desynchronized phase. In this case, the scale 32 printed by the second template for example can be found both on the far left and on the far right of the imprint left by the master template on the blanket. The measurement of the correction to be made can be read directly at the point of intersection between the scale 31 and the scale 32. The correction in development, ie the synchronization of the sectors, can be read on the scale 31; the correction affecting the height positioning of the template on the sector can be read on the scale 32. The assembly formed by the scales 31 of the master template and 32 of each of the three other templates has the same function as the locating crosses 2 , but occurs when the amplitude of the corrections is greater.

Lorsque la machine est préréglée, c'est-à-dire lorsque les axes AA' et BB' ont été tracés sur les quatre secteurs, la machine est prête à recevoir les clichés de travail et à commencer l'impression en série des pièces.When the machine is preset, that is to say when the axes AA 'and BB' have been traced on the four sectors, the machine is ready to receive the working shots and to start the serial printing of the parts.

Tous les clichés de travail sont établis sur la base de copies du film matrice. De ce fait, les axes AA' et BB' figurent sur tous les clichés. Ils ne sont matérialisés par la gravure qu'au voisinage des perforations 4, 5, 6 et 7 (fig. 6 et 6e).All working shots are made on the basis of copies of the matrix film. Therefore, the axes AA 'and BB' appear on all the pictures. They are only materialized by engraving in the vicinity of the perforations 4, 5, 6 and 7 (fig. 6 and 6e).

La mise en machine des jeux de clichés se résume pour l'opérateur à vérifier la coïncidence des axes AA' et BB' tracés sur le secteur avec les axes AA' et BB' gravés sur le cliché (fig. 6e). Il suffit à l'opérateur d'ajuster le cliché par le jeu des barrettes de fixation 34 (fig. 6) en amenant les axes en superposition.The setting in machine of the sets of stereotypes is summarized for the operator to check the coincidence of the axes AA 'and BB' traced on the sector with the axes AA 'and BB' engraved on the stereotype (fig. 6e). The operator just has to adjust the picture by the play of the fixing bars 34 (fig. 6) by bringing the axes in superposition.

La mise en coïncidence et le contrôle sont rendus possibles par le fait que les perforations 4, 5, 6 et 7 pratiquées sur chacun des clichés laissent apparaître les axes tracés sur les secteurs (fig. 6e).Coincidence and control are made possible by the fact that the perforations 4, 5, 6 and 7 made on each of the photographs reveal the axes traced on the sectors (fig. 6e).

Le préréglage de la machine permet d'utiliser des formats de clichés différents; en effet, l'axe AA' étant à proximité de la marge d'accrochage 3, quelle que soit la grandeur du cliché, il est possible de perforer deux trous laissant apparaître l'axe AA'. En ce qui concerne l'axe BB', il se trouvera à mi-hauteur si le cliché est grand, il sera dans le haut du cliché si celui-ci est petit.The machine preset allows different formats to be used; in fact, the axis AA 'being close to the attachment margin 3, whatever the size of the plate, it is possible to punch two holes revealing the axis AA'. Regarding the axis BB ', it will be halfway up if the picture is large, it will be at the top of the picture if it is small.

L'avantage de la présente invention par rapport aux solutions déjà connues est de parvenir à déplacer dans une certaine mesure le moment du réglage, ou plus exactement de scinder le réglage en deux étapes distinctes. La première étape est le préréglage de la machine. Celui-ci est un peu plus long que le réglage tel qu'il est pratique d'ordinaire, mais il a le mérite de déployer un effet permanent, et n'a donc plus à être répété. La deuxième étape, étroitement dépendante de la première, consiste à déplacer le moment du réglage du cliché sur le secteur ou, plus précisément, à le prérégler de telle sorte que le réglage en machine soit limité à un simple contrôle, éliminant ainsi le tâtonnement qui immobilise par trop la machine.The advantage of the present invention compared to already known solutions is that it succeeds in moving the adjustment moment to a certain extent, or more precisely in dividing the adjustment into two distinct stages. The first step is to preset the machine. This is a little longer than the setting as it is usually practical, but it has the merit of deploying a permanent effect, and therefore does not have to be repeated. The second step, closely dependent on the first, consists in shifting the timing of the adjustment of the plate on the sector or, more precisely, in presetting it so that the adjustment in machine is limited to a simple control, thus eliminating the groping which immobilizes the machine too much.

Les systèmes déja connus tentent également de déplacer le moment du réglage, mais, outre leur fonctionnement incertain, ils présentent le handicap de demander une précision totale à une opération (la perforation des clichés) qui est justement celle qui s'y prête le moins. La présente invention, au contraire, requiert la même précision d'une opération qui s'y prête parfaitement (la copie du film-matrice) alors que les perforations utilisées sont pratiquées avec une précision relative sans qu'il en résulte aucun inconvénient.The already known systems also try to shift the timing of the adjustment, but, in addition to their uncertain functioning, they have the handicap of asking for total precision in an operation (the perforation of the pictures) which is precisely that which is least suitable for it. The present invention, on the contrary, requires the same precision of an operation which lends itself perfectly to it (copying the matrix film) whereas the perforations used are made with relative precision without any resulting disadvantage.

Claims (4)

1. A method of preadjusting a dry offset machine and adjusting corresponding working plates, the said machine being intended for printing on cylindrical or conical workpieces and essentially comprising a series of plate-bearing sectors, a blanket-bearing sector and a workpiece- bearing mandrel, characterised in that it comprises the following steps:
a) a basic matrix film is prepared by engraving onto a film reference crosses (2) and two axes AA' and BB' forming between them an angle of from 80 to 100°, the axis AA' being orientated such that its image on each of the templates is parallel to the axis of rotation of the plate bearing-sector on which this template will be mounted;
b) a detailed matrix film is prepared by arranging, on a copy of the basic matrix film produced in a), alignment bars (8, 9, 10, 11) parallel to the axis AA';
c) a master template (100) is taken from the detailed matrix film and adjustment scales (30, 31) are optionally arranged on this master template;
d) templates (1) are taken from the basic matrix film and an adjustment scale (32) is optionally arranged on each of these;
e) four holes (4, 5, 6, 7) are made in the same manner and at about the same positions on each of the templates (100, 1), two of these holes (4, 6) on the axis AA' above and below each template, and two holes (5, 7) on the axis BB';
f) each working plate is prepared from a copy of the basic matrix film by making holes (4, 5, 6, 7) on this copy and engraving in the vicinity of these holes the axes AA' and BB' appearing on the said copy;
g) the master template (100) is fixed onto the first plate-bearing sector of the machine and the inking is produced from this, then a pass is made with the blanket (23) and a test piece (21), and the position of the said master template (100) is adjusted on the first sector by checking the position of the images (8", 10") of two alignment bars (8, 10) rearranged on the blanket (23) by the images (8', 10') of the said bars (8, 10) printed on the test piece (21);
h) a template (1) is then placed on every other plate-bearing sector, the inking is produced from this and a pass is made with the blanket (23), then the position of the said template (1) is adjusted by making the images of its reference crosses (2) arranged on the blanket (23) coincide with the images of the crosses (2) arranged on this same blanket (23) by the master template (100), the position of which has been previously adjusted in g), and by optionally using the images of the adjustment scales (30, 31, 32) arranged on the said blanket (23) by the said template (1) and by the master template (100);
i) once each template (100 or 1) has been adjusted on the corresponding plate-bearing sector, each sector is marked across the holes (4, 5, 6, 7) of the said template (100 or 1) with marks aligned with the axis AA' and marks aligned with the axis BB', then the template (100 or 1) is removed from the machine and the axes AA' are traced onto the said plate-bearing sector by linking the said marks;
j) each working plate is then positioned on the corresponding plate-bearing sector by aligning the parts of the axes AA' and BB' engraved in the vicinity of the holes (4, 5, 6, 7) of the said plate with the axis AA' and BB' engraved on the said sector.
2. A method according to claim 1, characterised in that the alignment bars (8, 9, 10, 11) arranged on the detailed matrix film and reproduced on the master template (100) are divided into two groups: one group (8 and 10) marking the beginning of the development of the workpiece is to be printed on the other group (9 and 11) marking the end of the blanket.
3. A method according to claim 2, characterised in that an adjustment scale (30) is arranged on the master template (100), a starting point of this scale (30) being placed on the line of the end of the blanket determined by the right-hand edge (13) of the alignment bars (9, 11) marking the end of the blanket.
4. A method according to claim 3, characterised in that a second adjustment scale (31) is arranged on the master template (100) perpendicular to the axis AA', having its starting point situated in the central part of the said master template (100) and extending towards the right and towards the left from this starting point, and in which an adjustment scale (32) is arranged on every other template (1) parallel to AA', the centre of which has a position identical to that of the scale (31) on the master template (100).
EP82420171A 1981-12-08 1982-12-06 Preadjusting method for a dry offset machine Expired EP0081443B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82420171T ATE17681T1 (en) 1981-12-08 1982-12-06 PROCEDURE FOR PRESETTING A DRY OFFSET MACHINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7831/81A CH648237A5 (en) 1981-12-08 1981-12-08 METHOD OF MANUFACTURING TEMPLATES AND CLICKS AND THEIR USE FOR ADJUSTING A DRY OFFSET MACHINE FOR PRINTING CYLINDRICAL OR CONICAL PARTS.
CH7831/81 1981-12-08

Publications (2)

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EP0081443A1 EP0081443A1 (en) 1983-06-15
EP0081443B1 true EP0081443B1 (en) 1986-01-29

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EP82420171A Expired EP0081443B1 (en) 1981-12-08 1982-12-06 Preadjusting method for a dry offset machine

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US (1) US4520730A (en)
EP (1) EP0081443B1 (en)
JP (1) JPS58104748A (en)
AT (1) ATE17681T1 (en)
BE (1) BE895274A (en)
CA (1) CA1191393A (en)
CH (1) CH648237A5 (en)
DE (1) DE3268902D1 (en)
ES (1) ES8404913A1 (en)
FI (1) FI73628C (en)
FR (1) FR2517593B1 (en)
GR (1) GR77851B (en)
IT (1) IT1154386B (en)
MX (1) MX157654A (en)
NO (1) NO159984C (en)
OA (1) OA07266A (en)
PT (1) PT75943B (en)
ZA (1) ZA828948B (en)

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DE3903806C1 (en) * 1989-02-09 1990-02-01 Dieter Dr. 4005 Meerbusch De Hoell
US5363564A (en) * 1993-04-22 1994-11-15 E. L. Harley Inc. Printing plate mounting and proofing machine and method for using same
US5722178A (en) * 1995-05-10 1998-03-03 Wells; Harold T. Method for setting and regulating the position of webbing in a printing press using premarked makeready tape

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Publication number Priority date Publication date Assignee Title
FR438296A (en) * 1911-12-27 1912-05-13 Karl Marie Schlueter Templates for adjusting clichés
US1151461A (en) * 1912-01-17 1915-08-24 Hugo Knudsen Process for making printing-plates.
US2236000A (en) * 1938-09-07 1941-03-25 John A Koessler Method for registering printing plates
US2580576A (en) * 1948-11-15 1952-01-01 Jr Robert R Myers Method of registering multicolor printing plates
US2630755A (en) * 1949-08-15 1953-03-10 Inez L Herrin Method of cutting stencils
US2711031A (en) * 1952-05-06 1955-06-21 Jr Harry C Kessler Lithographic step and repeat system
US2793442A (en) * 1955-03-11 1957-05-28 Intercompany Corp Procedure and apparatus for registering photographic sheets and the like
US2894454A (en) * 1957-08-01 1959-07-14 Hall Printing Co W F Method of preregistering printing plates in multicolor printing
US3361060A (en) * 1965-03-15 1968-01-02 Mosstype Corp Machine for mounting and proofing rubber printing plates
DE2045953C3 (en) * 1970-09-17 1981-10-22 Heinz 5653 Leichlingen Metje Registration system for registering printing plates in offset web-fed rotary machines
US3908546A (en) * 1972-10-16 1975-09-30 Motter Printing Press Co Plate clamping mechanism for printing cylinder
FR2312373A1 (en) * 1975-05-28 1976-12-24 Liege Ste Francaise Continuous stopper printing machine - has rotary disc transporting past flame treatment, printing and unloader units
DE2526446A1 (en) * 1975-06-13 1976-12-23 Roland Offsetmaschf DEVICE FOR ADJUSTING PRINT PLATES ON THE PLATE CYLINDER OF PRINTING MACHINES WITH THE AID OF A READING DEVICE AND COPIES COPIED ON THE PRINT PLATES
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DE3025060A1 (en) * 1979-07-30 1981-02-19 Riso Kagaku Corp ARRANGEMENT AND DEVICE FOR ATTACHING OR ATTACHING A FILM, A FILM-LIKE SHEET OR A FLAT MATERIAL TO A TAPE PROJECT OF A MOLDED BODY

Also Published As

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FI824195L (en) 1983-06-09
EP0081443A1 (en) 1983-06-15
CA1191393A (en) 1985-08-06
FI73628C (en) 1987-11-09
FI73628B (en) 1987-07-31
ES517897A0 (en) 1984-05-16
NO159984B (en) 1988-11-21
FR2517593A1 (en) 1983-06-10
GR77851B (en) 1984-09-25
PT75943B (en) 1985-02-27
PT75943A (en) 1983-01-01
IT1154386B (en) 1987-01-21
NO159984C (en) 1989-03-01
JPS58104748A (en) 1983-06-22
IT8224546A0 (en) 1982-12-01
ZA828948B (en) 1983-10-26
BE895274A (en) 1983-06-07
MX157654A (en) 1988-12-08
FI824195A0 (en) 1982-12-07
ES8404913A1 (en) 1984-05-16
DE3268902D1 (en) 1986-03-13
US4520730A (en) 1985-06-04
CH648237A5 (en) 1985-03-15
FR2517593B1 (en) 1986-02-14
OA07266A (en) 1984-08-31
ATE17681T1 (en) 1986-02-15
NO824106L (en) 1983-06-09

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