EP2300231B1 - Printing unit with two spacer devices and corresponding use - Google Patents

Printing unit with two spacer devices and corresponding use Download PDF

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Publication number
EP2300231B1
EP2300231B1 EP09766046A EP09766046A EP2300231B1 EP 2300231 B1 EP2300231 B1 EP 2300231B1 EP 09766046 A EP09766046 A EP 09766046A EP 09766046 A EP09766046 A EP 09766046A EP 2300231 B1 EP2300231 B1 EP 2300231B1
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EP
European Patent Office
Prior art keywords
printing unit
cylinder
blanket cylinder
collar
spacing device
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.)
Not-in-force
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EP09766046A
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German (de)
French (fr)
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EP2300231A1 (en
Inventor
Dominique Malkic
Timothée LALOY
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Goss International Montataire SA
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Goss International Montataire SA
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Publication of EP2300231A1 publication Critical patent/EP2300231A1/en
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Publication of EP2300231B1 publication Critical patent/EP2300231B1/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
    • B41F13/24—Cylinder-tripping devices; Cylinder-impression adjustments
    • B41F13/34—Cylinder lifting or adjusting devices

Definitions

  • the invention applies in particular to rotary offset presses.
  • the spacing device of such a printing unit allows a spacing of the printing cylinders during a paper break. Indeed, when using the printing unit, it may happen that the paper web that is unwound from the reel tears. Even if the cylinders of the printing unit are stopped immediately after such tearing, it is inevitable that a certain amount of torn paper will roll around the rolls after this unexpected breakage.
  • the rolls can then be moved apart from each other to bring them into non-printing configuration and thus remove the paper jammed around the rolls. Once the broken paper removed, then re-actuates the spacer in the opposite direction to bring the cylinders print configuration. The print operation can then resume.
  • EP 1 803 560 A1 discloses a pressureless blanket changing tubular printing unit for the passage of a paper web and a corresponding printing press.
  • US 5,690,029 discloses a device for engaging and disengaging a blanket cylinder.
  • An object of the invention is to improve the print quality of this type of printing unit.
  • the subject of the invention is a printing unit according to claim 1 and the use of this printing unit according to claim 18.
  • this second spacer device for adjusting the distance between the cylindrical surfaces of the first blanket cylinder and the backpressure cylinder, it becomes It is possible to adapt the printing unit according to the thickness or grammage of the paper used for printing. Indeed, the optimum distance between the cylindrical surfaces of the first blanket cylinder and the counter-pressure cylinder is higher for a thick paper than for a thin paper. With the second spacing device according to the invention, it is now possible to take into account these differences in paper thickness and thus maintain a good print quality regardless of the type of paper used.
  • the invention also relates to a method of using a printing unit of the aforementioned type, comprising a step of adjusting the distance between the first blanket cylinder and the backpressure cylinder as a function of the thickness of the paper by the second spacer.
  • the figures 1 and 2 illustrate a printing unit 2, wherein the two upper and lower printing groups, each comprising a blanket cylinder and a plate cylinder, have been omitted in order to be able to see the two spacers.
  • the printing unit 2 comprises a frame 4 serving to carry the various mechanical elements of the printing unit 2.
  • the frame 4 has two uprights 24 and 24 ', these two uprights corresponding to the two lateral ends of the The printing unit 2.
  • the side 26 of the printing unit, where the post 24 is located, is commonly called the "function side", while the side 26 ', where the post 24' is located, is commonly called "command side".
  • figures 1 and 2 correspond to diagonal views, the figure 1 allowing to see the inner face 3 'of the amount 24', while the figure 2 allows to see the inner face 3 of the upright 24 of the frame 4.
  • the printing unit 2 comprises an upper printing unit 6 consisting of a first plate cylinder or upper plate cylinder 12 and a first blanket cylinder or upper blanket cylinder 10, and a lower printing unit 8, consisting of a second plate cylinder or lower plate cylinder 16 and a second blanket cylinder or lower blanket cylinder 14.
  • the lower blanket cylinder 14 can also be described as backpressure cylinder 14 for the upper blanket cylinder 10.
  • the printing unit 2 has the specificity of having two spacers 100 and 200 which together form a spacer system 5 (cf. figure 1 ).
  • first spacing device 100 the elements belonging to the first spacing device 100 are designated by reference numerals between 101 and 199, while the elements of the second spacing device 200 are designated by reference numerals between 201 and 299.
  • the spacer system 5 is preferably an offset system, as illustrated in the figures, with a first offset device 100 and a second offset device 200.
  • the offset system 5 comprises two sets of four eccentric bearings 101, 103, 202, 105 and 101 ', 103', 202 'and 105', two sets of four collars 104, 206, 107, 109 and 104 ', 206', 107 'and 109', a double eccentric shaft 102, 208, a means 112 for actuating the first eccentric device 100, and adjustment means 204 for the second eccentric device 200.
  • the first set of four eccentric bearings 101, 103, 202 and 105 is housed vertically inside the upright 24 of the frame 4 (cf. figures 1 and 3 ).
  • the second set of eccentric bearings 101 ', 103', 202 'and 105' is located opposite the first set in the other upright 24 'of the frame 4 (cf. figure 2 ). These eight bearings accommodate the four drive shafts of the four cylinders of the printing unit 2.
  • the bearings 101, 101 ' accommodate the drive shaft of the upper plate cylinder 12, the bearings 103, 103' accommodate the drive shaft of the upper blanket cylinder 10, the bearings 202 and 202
  • the bottom blank cylinder cylinder 14 is driven by the drive shaft and the bearings 105 and 105 'accommodate the drive shaft of the lower plate cylinder 16.
  • the set of collars 104, 206, 107 and 109 is associated with the bearing set 101, 103, 202 and 105, while the set of collars 104 ', 206', 107 'and 109' is associated with the bearing set 101 ' , 103 ', 202' and 105 '. More specifically, the collar 109 (109 ') is secured to the bearing 101 (101'). The collar 107 (107 ') is secured to the bearing 103 (103'), the collar 206 (206 ') is secured to the bearing 202 (202') and the collar 104 (104 ') is secured to the bearing 105 (105'). (cf. figure 3 ).
  • Each eccentric bearing is a three-ring bearing, with an inner ring, a middle ring and an outer ring.
  • the inner ring receives the associated cylinder shaft.
  • Each collar is secured to the middle ring of the associated eccentric bearing.
  • the inner ring and the middle ring are connected by rolling bodies and thus together form a bearing for the rotation of the associated cylinder during printing.
  • the middle ring and the outer ring together form a sliding bearing, the outer ring being fixed to the frame 24.
  • the middle ring is able to rotate by sliding with respect to the outer ring and thus with respect to the frame 24.
  • the axis of rotation relative to the frame of the plain bearing formed by the middle ring and the outer ring is different from the axis of rotation relative to the frame of the bearing formed by the middle ring and the inner ring.
  • the double eccentric shaft 102, 208 comprises a central shaft 102 which is surrounded by a tube 208 (cf. figure 7 ). This double shaft ensures the connection between the two sets of collars on one side 26 and on the other side 26 'of the printing unit 2 (cf. figure 1 ).
  • the means 112 for actuating the first eccentric device 100 is secured to the shaft 102 of the double eccentric shaft (cf. figure 3 ), while the adjustment means 204 of the second offset device 200 are secured to the eccentric bearing 202 (cf. figure 6 ).
  • the figure 3 shows the structure of the first offset device 100.
  • figure 3 is a side view of the printing unit 2 according to the arrow F of the figure 1 , the amount 24 not being represented.
  • the figure 3 illustrates the side 26 or "function side" of the offset system 5.
  • On the figure 3 there is an arrow S which indicates the path of the paper web through the printing unit 2 during printing.
  • the first offset device 100 comprises a jack 114 which is connected to a lever 116, the jack 114 and the lever 116 forming together the actuating means 112.
  • the lever 116 is fixed on the shaft 102 of the double shaft. offset.
  • the shaft 102 is provided with two levers 118, 118 '. The far end of the shaft 102 of each of these levers 118, 118 'forms a first fork which receives the end of a rod 120, pivotally mounted on the first fork. The other end of the rod 120, 120 'is connected to the collar 107, 107' of the upper blanket cylinder 10.
  • connection between the end of the rod 120, 120 'and the collar 107, 107' is provided by a second fork 122, 122 'formed on the collar 107, 107'.
  • the collar 107, 107' On its side substantially opposite to the second fork 122, 122 ', the collar 107, 107' has a third fork 124, 124 'which receives the ends of two links 126 and 128.
  • the links 126, 126' and 128, 128 ' provide the connection respectively to the collar 109, 109' of the upper plate cylinder 12 and the collar 104, 104 'of the lower plate cylinder 16.
  • the collars 104, 107 and 109 are respectively fixed to the bearings 105, 103 and 101.
  • the offset device 100 is completed, on the other side of the printing unit 2, that is to say the control side 26 ', a second set of three collars 104', 107 'and 109 'respectively fixed to eccentric bearings 105', 103 'and 101', the second set of collars being identical to the first function side 26 which has just been described.
  • the connection between these two sets of collars is provided by the transverse shaft 102 which extends from the function side 26 to the control side 26 '(cf. figure 7 ).
  • the cylinders of the printing unit 2 are stopped.
  • the cylinders are brought into a non-printing configuration in which the first plate cylinder 12 is spaced from the first blanket cylinder 10 and the first blanket cylinder 10 is moved away from the backpressure cylinder 14.
  • This cylinder spacing operation is triggered by the activation of the cylinder 114.
  • the rod 130 of the cylinder 114 then moves to pivot the lever 116 and with it the shaft 102.
  • the rods 120, 120 'thus rotate the collars 107, 107'.
  • This pivoting movement is transmitted by the rods 126, 126 'and 128, 128' to the collars 104, 104 'and 109, 109'.
  • the transmission of the movement to the collars 104, 104 ' is via return triangles 210, 210'. During this transmission, the return triangles 210, 210 'rotate exclusively around a first center of rotation C1.
  • the cylinder 114 can be reactivated which will perform a reverse translation movement to bring the cylinders into their printing configuration.
  • the second offset device 200 mainly comprises adjustment means 204 shown in FIG. figure 4 two eccentric bearings 202, 202 '(see figure 6 ) on either side of the printing unit 2, these eccentric bearings receiving the ends of the drive shaft of the lower blanket cylinder 14, and means ensuring the connection between the two eccentric bearings 202, 202 'and secondly, between the second offset device 200 and the first offset device 100.
  • the adjustment means 204 are arranged on the outer face 28 of the upright 24 of the frame 4 (see FIG. figure 1 ).
  • a rotary adjusting knob 222 is mounted on a threaded cardan shaft 220.
  • a tapping nut 218 fixed to a pivoting flange 216.
  • the pivoting flange 216 is connected to the eccentric bearing 202, which on the figure 4 is hidden behind the flange 216 and is arranged in the upright 24 of the frame 4.
  • the eccentric bearing 202 is connected on its opposite side to the collar 206 of the lower blanket cylinder 14.
  • the figure 6 is a cross-section through the upright 24 of the frame 4, showing in detail the connections between the flange 216, the eccentric bearing 202 and the collar 206.
  • the eccentric bearing 202 is a three-ring bearing, with an inner ring 224, a middle ring 226, and an outer ring 228.
  • the inner ring 224 is attached to one end 22 of the drive shaft of the carrier cylinder. lower blanket 14.
  • the end 22 of the drive shaft is rotatable, together with the inner ring 224, inside the eccentric bearing 202 relative to rolling bodies such as needles 230.
  • the middle ring 226 is fixed on one side to the flange 216 and on the other side to the collar 206.
  • the inner ring 224 is slightly eccentric with respect to the middle ring 226, of the order of 1 mm.
  • the middle ring 226 and the outer ring 228 together form a sliding bearing, that is to say that the middle ring 226 is able to perform a rotation by sliding relative to the outer ring 228, this outer ring 228 being fixed to the amount 24 of the frame 4.
  • the structure of the eccentric bearing 202 'located on the control side 26' of the printing unit 2 is identical to the structure of the eccentric bearing 202 which has just been described.
  • the drive side collar 206 ' is affixed in the same manner to the eccentric bearing 202' as the collar 206 to the eccentric bearing 202.
  • the adjustment means 204 are not reproduced on the control side 26 '.
  • the collar 206 has a substantially annular appearance, apart from two forks 232 and 234, one being substantially opposite the other.
  • the fork 232 is secured to a deflection triangle 210 which provides coupling with the first offset device 100.
  • the deflection triangle 210 is secured by the rod 106 to the collar 104 and thus to the eccentric bearing 105 of the first device
  • the second offset device 200 uses the elements 104, 105 and 106 of the first offset device 100. These elements are therefore part of both offset devices at a time.
  • the deflection triangle 210 consists of three vertices A, B, C connected by straight segments S1, S2, S3.
  • the fork 234 accommodates the end of a link 236, this link 236 being connected at its other end to a lever 238.
  • the lever 238 is mounted on a tube 208 which is free to rotate about the shaft 102 of the first eccentric device 100.
  • the lever 238 is mounted on the tube 208 at the end of the function side 26 of the the printing unit 2.
  • At the other end of the tube 208 there is a lever 238 'identical to the lever 238.
  • the elements connected to the lever 238', namely the rod 236 ', the collar 206' and the bearing eccentric 202 '(not shown in figure 7 ) are identical reproductions of the corresponding function-side elements 26 which provide identical spacing of the other end of the lower blanket cylinder drive shaft 14.
  • the reproduction of the same elements of the function-side 26 and the control side 26 ', connected by the tube 208 allows a homogeneous displacement on either side of the lower blanket cylinder 14.
  • the operator Before starting printing, the operator will set the distance between the lower blanket cylinder 14 and the upper blanket cylinder 10 according to the thickness of the paper to be printed by the second offset device 200 according to the invention.
  • the operator will turn the rotary knob 222 by a desired angle (cf. figure 4 ).
  • This rotational movement is reproduced by the cardan shaft 220.
  • the shaft 220 being only free in rotation but not in translation, its rotation will have the effect, through its threading engaged with the complementary thread of the 218, to advance or retreat the nut 218, as indicated on the figure 4 by the double arrow G.
  • This movement G results in a pivoting of the flange 216 and thus of the middle ring 226 and the collar 206 (see FIG. figure 6 ).
  • This pivoting is transmitted through the tube 208 on the other side 26 'of the printing unit 2 and results in a corresponding pivoting of the middle ring 226' of the eccentric bearing 202 '.
  • radial displacement means a displacement of the cylinder perpendicular to its longitudinal axis, that is to say a displacement along a radius of the cylinder.
  • the linking kinematics of the return triangles 210, 210 ' ensures a permanent contact between the lower blanket cylinder 14 and the lower plate cylinder 16 during adjustment with the aid of the offset device 200.
  • the return triangles 210, 210 ' rotate exclusively around a second center of rotation C2, distinct from the first center of rotation C1 (see figure 3 ).
  • the adjustment with the offset device 200 must not result in a relative movement between the lower blanket cylinder 14 and the lower plate cylinder 16. Otherwise, the correct transmission of the cylinder image lower plate 16 to the lower blanket cylinder 14 when printing to occur after the setting could be compromised. Thanks to the return triangles 210, 210 ', the pivoting movement of the collars 206, 206' of the lower blanket cylinder 14 is reproduced by the collars 104, 104 'of the lower plate cylinder 16, so that the cylinder Lower plate holder 16 follows the movement of the lower blanket cylinder 14 to cancel any relative movement between the two cylinders.
  • the Figures 8 to 11 illustrate the behavior of the different elements of the two offset devices 100 and 200 during their actuation.
  • the Figures 8 to 11 illustrate the elements situated on the function side 26 of the printing unit 2.
  • the corresponding elements situated on the other side 26 have the same behavior as the elements of the Figures 8 to 11 .
  • the bottom plate cylinder 16 can be distinguished with its collar 104, the lower blanket cylinder 14 with its collar 206, as well as the upper blanket cylinder 10 with its collar 107.
  • the upper plate cylinder is not represent.
  • the figure 8 shows the cylinders in their operational state, the first offset device 100 having not been activated and the second offset device 200 being in "mini" adjustment mode, where the distance L between the cylindrical surface 18 of the cylinder upper blanket door 10 and the cylindrical surface 20 of the lower blanket cylinder 14 is substantially equal to 0 mm. It will be noted that the distance D between the cylindrical surface of the lower blanket cylinder 14 and the cylindrical surface of the lower plate cylinder 16 is also substantially equal to 0 mm.
  • cylindrical surface the surface of revolution of the cylinder extending from one amount of the frame 4 to the other.
  • the state shown at figure 9 corresponds to the state shown in the figure 8 , with the difference that the first offset device 100 has been activated.
  • This activation causes a pivoting of the lever 118 and therefore the collars 107 and 104, which causes a spacing of the cylinders 10 and 16 relative to the cylinder 14.
  • the cylinder 14 and its associated collar 206 on the other hand have not moved. From this spacing results a value of L and D of about 1.5 mm.
  • the figure 10 again shows an operational state, but in this case, the operator has actuated the offset device 200 to adjust the distance between the two blanket cylinders 10 and 14 in "maxi" mode, L having then a value about 0.3 mm.
  • This setting is suitable for optimizing the print quality on thick paper. It is found that the collar 206 of the lower blanket cylinder 14, and with it the bearing 202, have pivoted by an angle with respect to the position shown in FIG. figure 8 . Thanks to the deflection triangle 210, the lower plate cylinder 16 has followed the movement of the blanket cylinder lower 14, so that the distance D is always substantially equal to 0 mm.
  • the figure 11 corresponds to the figure 10 , the offset device 100 having been activated.
  • the distance L is then equal to about 1.5 mm, while the distance D is equal to about 1.65 mm. It can be seen that the activation of the offset device 100, when the offset device 200 is in "maximum” adjustment mode, results in a gap D between the lower blanket cylinder 14 and the lower plate cylinder 16 (see the figure 11 ) which is greater than the distance D obtained when activating the offset device 100 when the offset device 200 is in "mini" adjustment mode.
  • the Figures 12 to 14 illustrate alternative embodiments of the offset device 200. In all three cases, these are representations of the elements of the function side 26.
  • the variant according to figure 12 is different from the preferred solution described above by the shape of the deflection triangle 210 and associated rods. Indeed, in the solution according to figure 12 , the deflection triangle 210 has substantially the shape of a boomerang with a bend K and two branches B1 and B2.
  • the branch B2 is directly connected to the collar 104 of the lower plate cylinder 16, while the branch B1 is connected to the collar 206 of the lower blanket cylinder 14 via a link 212.
  • the rod 106 is removed and the link 128 extended.
  • the crossover triangle figure 13 has a shape of continuous curve, in contrast with the triangle of reference according to the figure 12 which consists of two straight segments connected by a corner.
  • the branch B2 is connected to the collar 104 via the rod 106.
  • the elbow K is directly connected to the collar 206.
  • the three-ring eccentric bearing of the lower plate cylinder is replaced by a new four-ring eccentric bearing 108.
  • a first ring 110 of this new bearing 108 is part of the first offset device 100 and is connected thereto by a rod 132.
  • a second ring 214 of this new bearing 108 is part of the second offset device 200 and is connected thereto by a link 240.
  • the role of the rings 110 and 214 is reversed, that is to say that the ring 110 is then part of the second offset device, while the ring 214 is part of the first device runout. It is this new four-ring bearing 108 which provides the coupling between the first offset device 100 and the second offset device 200.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)

Description

La présente invention concerne une unité d'impression comprenant :

  • un bâti ;
  • un premier groupe d'impression, ce premier groupe d'impression ayant un premier cylindre porte-blanchet et un premier cylindre porte-plaque ;
  • un cylindre de contre-pression ; et
  • un premier dispositif d'écartement adapté pour déplacer les cylindres les uns par rapport aux autres entre une configuration d'impression, dans laquelle le premier cylindre porte-plaque est en contact avec le premier cylindre porte-blanchet, et une configuration hors impression, dans laquelle le premier cylindre porte-plaque est écarté du premier cylindre porte-blanchet et le premier cylindre porte-blanchet est écarté du cylindre de contre-pression.
The present invention relates to a printing unit comprising:
  • a building;
  • a first printing unit, said first printing unit having a first blanket cylinder and a first plate cylinder;
  • a counterpressure cylinder; and
  • a first spacer adapted to move the rolls relative to each other between a print configuration, wherein the first plate cylinder is in contact with the first blanket cylinder, and a non-print configuration, in wherein the first plate cylinder is spaced from the first blanket cylinder and the first blanket cylinder is moved away from the backpressure cylinder.

L'invention s'applique en particulier à des presses offset rotatives.The invention applies in particular to rotary offset presses.

Le dispositif d'écartement d'une telle unité d'impression permet un écartement des cylindres d'impression lors d'une casse papier. En effet, lors de l'utilisation de l'unité d'impression, il peut arriver que la bande de papier qui est déroulée de la bobine se déchire. Même si les cylindres de l'unité d'impression sont arrêtés immédiatement après un tel déchirement, il est inévitable qu'une certaine quantité de papier déchiré s'enroule autour des cylindres après cette casse imprévue. En actionnant le dispositif d'écartement, on peut alors écarter les cylindres les uns des autres pour les amener en configuration hors impression et ainsi retirer le papier bloqué autour des cylindres. Une fois le papier cassé enlevé, on re-actionne alors le dispositif d'écartement en sens inverse pour ramener les cylindres en configuration d'impression. L'opération d'impression peut alors reprendre.The spacing device of such a printing unit allows a spacing of the printing cylinders during a paper break. Indeed, when using the printing unit, it may happen that the paper web that is unwound from the reel tears. Even if the cylinders of the printing unit are stopped immediately after such tearing, it is inevitable that a certain amount of torn paper will roll around the rolls after this unexpected breakage. By actuating the spacing device, the rolls can then be moved apart from each other to bring them into non-printing configuration and thus remove the paper jammed around the rolls. Once the broken paper removed, then re-actuates the spacer in the opposite direction to bring the cylinders print configuration. The print operation can then resume.

EP 1 803 560 A1 décrit une unité d'impression à configuration hors-pression de changement de blanchet tubulaire permettant le passage d'une bande de papier et une presse d'impression correspondante. EP 1 803 560 A1 discloses a pressureless blanket changing tubular printing unit for the passage of a paper web and a corresponding printing press.

US 5 690 029 décrit un dispositif d'engagement et de désengagement d'un cylindre porte-blanchet. US 5,690,029 discloses a device for engaging and disengaging a blanket cylinder.

Un but de l'invention est d'améliorer la qualité d'impression de ce type d'unité d'impression.An object of the invention is to improve the print quality of this type of printing unit.

A cet effet, l'invention a pour objet une unité d'impression selon la revendication 1 et l'utilisation de cette unité d'impression selon la revendication 18.For this purpose, the subject of the invention is a printing unit according to claim 1 and the use of this printing unit according to claim 18.

En prévoyant un deuxième dispositif d'écartement au niveau de l'unité d'impression, ce deuxième dispositif d'écartement permettant le réglage de la distance entre les surfaces cylindriques du premier cylindre porte-blanchet et du cylindre de contre-pression, il devient possible d'adapter l'unité d'impression en fonction de l'épaisseur ou du grammage du papier utilisé pour l'impression. En effet, la distance optimale entre les surfaces cylindriques du premier cylindre porte-blanchet et du cylindre de contre-pression est plus élevée pour un papier épais que pour un papier fin. Avec le deuxième dispositif d'écartement selon l'invention, il est désormais possible de prendre en compte ces différences d'épaisseur de papier et ainsi de conserver une bonne qualité d'impression indépendamment du type de papier utilisé.By providing a second spacer device at the printing unit, this second spacer device for adjusting the distance between the cylindrical surfaces of the first blanket cylinder and the backpressure cylinder, it becomes It is possible to adapt the printing unit according to the thickness or grammage of the paper used for printing. Indeed, the optimum distance between the cylindrical surfaces of the first blanket cylinder and the counter-pressure cylinder is higher for a thick paper than for a thin paper. With the second spacing device according to the invention, it is now possible to take into account these differences in paper thickness and thus maintain a good print quality regardless of the type of paper used.

Selon des modes particuliers de réalisation de l'invention, l'unité d'impression comprend l'une ou plusieurs des caractéristiques suivantes :

  • le premier groupe d'impression est un groupe d'impression supérieur et le deuxième groupe d'impression est un groupe d'impression inférieur, le premier cylindre porte-plaque étant un cylindre porte-plaque supérieur et le premier cylindre porte-blanchet étant un cylindre porte-blanchet supérieur, le deuxième cylindre porte-blanchet étant un cylindre porte-blanchet inférieur et le deuxième cylindre porte-plaque étant un cylindre porte-plaque inférieur ;
  • le premier dispositif d'écartement est adapté pour déplacer les premier et deuxième cylindres porte-plaque et le premier cylindre porte-blanchet entre la configuration d'impression et la configuration hors impression, et le deuxième cylindre porte-blanchet reste immobile lors de ce déplacement ;
  • le premier dispositif d'écartement comporte des roulements excentriques ;
  • le deuxième dispositif d'écartement est un dispositif d'excentrage et comprend :
    • deux roulements excentriques logés dans le bâti, chaque roulement excentrique accueillant une extrémité du cylindre de contre-pression, et
    • des moyens de réglage adaptés pour régler la position angulaire de chaque roulement excentrique par rapport au bâti ;
  • le deuxième dispositif d'écartement comprend des moyens de transmission adaptés pour transmettre un mouvement de réglage, appliqué par les moyens de réglage à l'un des roulements situé à un côté du bâti, à l'autre des roulements situé sur un autre côté du bâti ;
  • le premier dispositif d'écartement comprend un arbre s'étendant entre deux montants du bâti, et les moyens de transmission comprennent un tube entourant ledit arbre ;
  • les moyens de renvoi comprennent au moins une partie du premier dispositif d'écartement ;
  • le deuxième dispositif d'écartement comprend un premier collier fixé au roulement excentrique et les moyens de renvoi comprennent un élément de renvoi d'un déplacement de ce premier collier à ladite partie du premier dispositif d'écartement ;
  • le premier dispositif d'écartement comprend un deuxième collier associé au deuxième cylindre porte-plaque, et les moyens de renvoi comprennent ce deuxième collier, le premier collier étant relié à ce deuxième collier par l'intermédiaire de l'élément de renvoi ;
  • l'élément de renvoi définit un premier centre de rotation autour duquel il tourne exclusivement lors de l'actionnement du premier dispositif d'écartement et un deuxième centre de rotation, distinct du premier centre de rotation, autour duquel il tourne exclusivement lors du réglage du deuxième dispositif d'écartement ;
  • l'élément de renvoi est relié au deuxième collier par une biellette, et le l'élément de renvoi est relié au premier collier par un prolongement du premier collier ;
  • l'élément de renvoi est relié au premier collier par une biellette, et l'élément de renvoi est relié au deuxième collier par un prolongement du deuxième collier ;
  • l'élément de renvoi est un triangle de renvoi qui est soit constitué de trois sommets reliés par des segments droits, soit constitué de deux branches reliées par un coude ;
  • le deuxième cylindre porte-plaque est associé à un roulement excentrique à quatre bagues, une première bague de ce roulement faisant partie du premier dispositif d'écartement, une seconde bague de ce roulement faisant partie du deuxième dispositif d'écartement ;
    • les moyens de réglage comprennent :
    • une bride pivotante liée au roulement excentrique ;
    • un taraudage lié à la bride pivotante ;
    • une tige filetée en prise avec le taraudage ; et
    • des moyens d'entraînement en rotation de la tige filetée ; un actionnement de ces moyens d'entraînement effectuant une rotation du roulement excentrique ; et
  • le deuxième dispositif d'écartement permet le réglage de la distance à une valeur exclusivement comprise entre 0 et 0,3 mm.
According to particular embodiments of the invention, the printing unit comprises one or more of the following features:
  • the first printing unit is an upper printing unit and the second printing unit is a lower printing unit, the first plate cylinder being an upper plate cylinder and the first blanket cylinder being a upper blanket cylinder, the second blanket cylinder being a lower blanket cylinder and the second plate cylinder being a lower plate cylinder;
  • the first spacer is adapted to move the first and second plate cylinders and the first blanket cylinder between the print configuration and the non-print configuration, and the second blanket cylinder remains stationary during this movement. ;
  • the first spacer has eccentric bearings;
  • the second spacer device is an offset device and comprises:
    • two eccentric bearings housed in the frame, each eccentric bearing accommodating one end of the counter-pressure cylinder, and
    • adjustment means adapted to adjust the angular position of each eccentric bearing relative to the frame;
  • the second spacer comprises transmission means adapted to transmit a setting movement, applied by the adjustment means to one of the bearings located at one side of the frame, to the other of the bearings located on another side of the frame. built;
  • the first spacer comprises a shaft extending between two uprights of the frame, and the transmission means comprise a tube surrounding said shaft;
  • the return means comprise at least a portion of the first spacer;
  • the second spacer includes a first collar attached to the eccentric bearing and the return means includes a return member of a displacement of the first collar to said portion of the first spacer;
  • the first spacer comprises a second collar associated with the second plate cylinder, and the return means comprise the second collar, the first collar being connected to the second collar via the deflection element;
  • the deflection element defines a first center of rotation about which it turns exclusively upon actuation of the first spacing device and a second center of rotation, distinct from the first center of rotation, around which it turns exclusively when adjusting the second spacer;
  • the deflection member is connected to the second collar by a link, and the deflection member is connected to the first collar by an extension of the first collar;
  • the return member is connected to the first collar by a link, and the return member is connected to the second collar by an extension of the second collar;
  • the return element is a return triangle which is either constituted of three vertices connected by straight segments, or consists of two branches connected by a bend;
  • the second plate cylinder is associated with an eccentric bearing with four rings, a first ring of this bearing forming part of the first spacing device, a second ring of this bearing forming part of the second spacing device;
    • the adjustment means comprise:
    • a pivoting flange connected to the eccentric bearing;
    • a tapping linked to the pivoting flange;
    • a threaded rod engaged with the thread; and
    • means for rotating the threaded rod; an actuation of these drive means rotating the eccentric bearing; and
  • the second spacing device allows the adjustment of the distance to a value exclusively between 0 and 0.3 mm.

L'invention concerne également un procédé d'utilisation d'une unité d'impression du type précité, comprenant une étape de réglage de la distance entre le premier cylindre porte-blanchet et le cylindre de contre-pression en fonction de l'épaisseur du papier par le deuxième dispositif d'écartement.The invention also relates to a method of using a printing unit of the aforementioned type, comprising a step of adjusting the distance between the first blanket cylinder and the backpressure cylinder as a function of the thickness of the paper by the second spacer.

L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple, et faite en se référant aux dessins annexés, sur lesquels :

  • la figure 1 est une première vue en perspective d'un exemple de réalisation d'une unité d'impression selon l'invention, certains éléments ayant été omis;
  • la figure 2 est une deuxième vue en perspective de l'unité d'impression de la figure 1, certains éléments ayant été omis ;
  • la figure 3 est une vue de côté de l'un des deux jeux de colliers du système d'écartement de l'unité d'impression des figures 1 et 2 ;
  • la figure 4 est une vue de côté des moyens de réglage du deuxième dispositif d'écartement de l'unité d'impression des figures 1 et 2 ;
  • la figure 5 est une vue de dessus des moyens de réglage de la figure 4 ;
  • la figure 6 est une vue d'une coupe transversale à travers les moyens de réglage de la figure 4 ;
  • la figure 7 est une vue en perspective du deuxième jeu de colliers du système d'écartement de l'unité d'impression des figures 1 et 2 ;
  • les figures 8 à 11 illustrent le fonctionnement des deux dispositifs d'écartement de l'unité d'impression des figures 1 et 2 ; et
  • les figures 12 à 14 montrent des variantes de réalisation du deuxième dispositif d'écartement selon l'invention.
The invention will be better understood on reading the description which follows, given solely by way of example, and with reference to the appended drawings, in which:
  • the figure 1 is a first perspective view of an exemplary embodiment of a printing unit according to the invention, some elements have been omitted;
  • the figure 2 is a second perspective view of the printing unit of the figure 1 some elements have been omitted;
  • the figure 3 is a side view of one of the two sets of clamps of the spacer system of the printing unit of figures 1 and 2 ;
  • the figure 4 is a side view of the adjustment means of the second spacer device of the printing unit of the figures 1 and 2 ;
  • the figure 5 is a top view of the adjustment means of the figure 4 ;
  • the figure 6 is a view of a cross section through the adjustment means of the figure 4 ;
  • the figure 7 is a perspective view of the second set of clamps of the spacer system of the printing unit of the figures 1 and 2 ;
  • the Figures 8 to 11 illustrate the operation of the two spacers of the printing unit of the figures 1 and 2 ; and
  • the Figures 12 to 14 show alternative embodiments of the second spacer device according to the invention.

Les figures 1 et 2 illustrent une unité d'impression 2, dans laquelle les deux groupes d'impression supérieur et inférieur, comprenant chacun un cylindre porte-blanchet et un cylindre porte-plaque, ont été omis afin de pouvoir apercevoir les deux dispositifs d'écartement. L'unité d'impression 2 comprend un bâti 4, servant à porter les divers éléments mécaniques de l'unité d'impression 2. Le bâti 4 dispose de deux montants 24 et 24', ces deux montants correspondant aux deux extrémités latérales de l'unité d'impression 2. Le côté 26 de l'unité d'impression, où se situe le montant 24, est communément appelé le « côté fonction », tandis que le côté 26', où se situe le montant 24', est communément appelé « côté commande ». Par la suite, pour tous les éléments de l'unité d'impression 2 qui se retrouvent de chaque côté 26 et 26' de celle-ci, on utilisera un numéro de référence suivi d'un apostrophe pour désigner le côté commande, tandis que le numéro de référence sans apostrophe désignera l'élément côté fonction.The figures 1 and 2 illustrate a printing unit 2, wherein the two upper and lower printing groups, each comprising a blanket cylinder and a plate cylinder, have been omitted in order to be able to see the two spacers. The printing unit 2 comprises a frame 4 serving to carry the various mechanical elements of the printing unit 2. The frame 4 has two uprights 24 and 24 ', these two uprights corresponding to the two lateral ends of the The printing unit 2. The side 26 of the printing unit, where the post 24 is located, is commonly called the "function side", while the side 26 ', where the post 24' is located, is commonly called "command side". Subsequently, for all the elements of the printing unit 2 which are found on each side 26 and 26 'thereof, a reference number followed by an apostrophe will be used to designate the command side, while the reference number without apostrophe will refer to the function-side element.

On notera que les figures 1 et 2 correspondent à des vues en diagonale, la figure 1 permettant d'apercevoir la face interne 3' du montant 24', tandis que la figure 2 permet d'apercevoir la face interne 3 du montant 24 du bâti 4.It should be noted that figures 1 and 2 correspond to diagonal views, the figure 1 allowing to see the inner face 3 'of the amount 24', while the figure 2 allows to see the inner face 3 of the upright 24 of the frame 4.

En référence à la figure 3, l'unité d'impression 2 comprend un groupe d'impression supérieur 6, constitué d'un premier cylindre porte-plaque ou cylindre porte-plaque supérieur 12 et d'un premier cylindre porte-blanchet ou cylindre porte-blanchet supérieur 10, ainsi qu'un groupe d'impression inférieur 8, constitué d'un deuxième cylindre porte-plaque ou cylindre porte-plaque inférieur 16 et d'un deuxième cylindre porte-blanchet ou cylindre porte-blanchet inférieur 14. Le cylindre porte-blanchet inférieur 14 peut aussi être qualifié de cylindre de contre-pression 14 pour le cylindre porte-blanchet supérieur 10.With reference to the figure 3 the printing unit 2 comprises an upper printing unit 6 consisting of a first plate cylinder or upper plate cylinder 12 and a first blanket cylinder or upper blanket cylinder 10, and a lower printing unit 8, consisting of a second plate cylinder or lower plate cylinder 16 and a second blanket cylinder or lower blanket cylinder 14. The lower blanket cylinder 14 can also be described as backpressure cylinder 14 for the upper blanket cylinder 10.

L'unité d'impression 2 a la spécificité de disposer de deux dispositifs d'écartement 100 et 200 qui forment ensemble un système d'écartement 5 (cf. figure 1).The printing unit 2 has the specificity of having two spacers 100 and 200 which together form a spacer system 5 (cf. figure 1 ).

On notera que les éléments appartenant au premier dispositif d'écartement 100 sont désignés par des numéros de référence entre 101 et 199, tandis que les éléments du deuxième dispositif d'écartement 200 sont désignés par des numéros de référence entre 201 et 299.It should be noted that the elements belonging to the first spacing device 100 are designated by reference numerals between 101 and 199, while the elements of the second spacing device 200 are designated by reference numerals between 201 and 299.

Le système d'écartement 5 est de préférence un système d'excentrage, tel qu'illustré sur les figures, avec un premier dispositif d'excentrage 100 et un deuxième dispositif d'excentrage 200. Le système d'excentrage 5 comprend deux jeux de quatre roulements excentriques 101, 103, 202, 105 et 101', 103', 202' et 105', deux jeux de quatre colliers 104, 206, 107, 109 et 104', 206', 107' et 109', un double arbre d'excentrage 102, 208, un moyen 112 d'actionnement du premier dispositif d'excentrage 100, et des moyens de réglage 204 du deuxième dispositif d'excentrage 200.The spacer system 5 is preferably an offset system, as illustrated in the figures, with a first offset device 100 and a second offset device 200. The offset system 5 comprises two sets of four eccentric bearings 101, 103, 202, 105 and 101 ', 103', 202 'and 105', two sets of four collars 104, 206, 107, 109 and 104 ', 206', 107 'and 109', a double eccentric shaft 102, 208, a means 112 for actuating the first eccentric device 100, and adjustment means 204 for the second eccentric device 200.

Le premier jeu de quatre roulements excentriques 101, 103, 202 et 105 est logé verticalement à l'intérieur du montant 24 du bâti 4 (cf. figures 1 et 3). Le deuxième jeu de roulements excentriques 101', 103', 202' et 105' se situe en vis-à-vis du premier jeu dans l'autre montant 24' du bâti 4 (cf. figure 2). Ces huit roulements accueillent les quatre arbres d'entraînement des quatre cylindres de l'unité d'impression 2.The first set of four eccentric bearings 101, 103, 202 and 105 is housed vertically inside the upright 24 of the frame 4 (cf. figures 1 and 3 ). The second set of eccentric bearings 101 ', 103', 202 'and 105' is located opposite the first set in the other upright 24 'of the frame 4 (cf. figure 2 ). These eight bearings accommodate the four drive shafts of the four cylinders of the printing unit 2.

Plus précisément, les roulements 101, 101' accueillent l'arbre d'entraînement du cylindre porte-plaque supérieur 12, les roulements 103, 103' accueillent l'arbre d'entraînement du cylindre porte-blanchet supérieur 10, les roulements 202 et 202' accueillent l'arbre d'entraînement du cylindre porte-blanchet inférieur 14 et les roulements 105 et 105' accueillent l'arbre d'entraînement du cylindre porte-plaque inférieur 16.More specifically, the bearings 101, 101 'accommodate the drive shaft of the upper plate cylinder 12, the bearings 103, 103' accommodate the drive shaft of the upper blanket cylinder 10, the bearings 202 and 202 The bottom blank cylinder cylinder 14 is driven by the drive shaft and the bearings 105 and 105 'accommodate the drive shaft of the lower plate cylinder 16.

Le jeu de colliers 104, 206, 107 et 109 est associé au jeu de roulements 101, 103, 202 et 105, tandis que le jeu de colliers 104', 206', 107' et 109' est associé au jeu de roulements 101', 103', 202' et 105'. Plus précisément, le collier 109 (109') est solidarisé au roulement 101 (101'). Le collier 107 (107') est solidarisé au roulement 103 (103'), le collier 206 (206') est solidarisé au roulement 202 (202') et le collier 104 (104') est solidarisé au roulement 105 (105') (cf. figure 3).The set of collars 104, 206, 107 and 109 is associated with the bearing set 101, 103, 202 and 105, while the set of collars 104 ', 206', 107 'and 109' is associated with the bearing set 101 ' , 103 ', 202' and 105 '. More specifically, the collar 109 (109 ') is secured to the bearing 101 (101'). The collar 107 (107 ') is secured to the bearing 103 (103'), the collar 206 (206 ') is secured to the bearing 202 (202') and the collar 104 (104 ') is secured to the bearing 105 (105'). (cf. figure 3 ).

Chaque roulement excentrique est un roulement à trois bagues, avec une bague interne, une bague médiane et une bague externe. La bague interne reçoit l'arbre du cylindre associé. Chaque collier est solidarisé à la bague médiane du roulement excentrique associé.Each eccentric bearing is a three-ring bearing, with an inner ring, a middle ring and an outer ring. The inner ring receives the associated cylinder shaft. Each collar is secured to the middle ring of the associated eccentric bearing.

La bague interne et la bague médiane sont liés par des corps de roulement et forment ainsi ensemble un roulement pour la rotation du cylindre associé lors de l'impression. La bague médiane et la bague externe forment ensemble un palier lisse, la bague externe étant fixée au bâti 24. Ainsi, la bague médiane est apte à tourner par glissement par rapport à la bague externe et donc par rapport au bâti 24.The inner ring and the middle ring are connected by rolling bodies and thus together form a bearing for the rotation of the associated cylinder during printing. The middle ring and the outer ring together form a sliding bearing, the outer ring being fixed to the frame 24. Thus, the middle ring is able to rotate by sliding with respect to the outer ring and thus with respect to the frame 24.

L'axe de rotation par rapport au bâti du palier lisse formé par la bague médiane et la bague externe est différent de l'axe de rotation par rapport au bâti du roulement formé par la bague médiane et la bague interne.The axis of rotation relative to the frame of the plain bearing formed by the middle ring and the outer ring is different from the axis of rotation relative to the frame of the bearing formed by the middle ring and the inner ring.

Le double arbre d'excentrage 102, 208 comprend un arbre central 102 qui est entouré par un tube 208 (cf. figure 7). Ce double arbre assure la liaison entre les deux jeux de colliers d'un côté 26 et de l'autre côté 26' de l'unité d'impression 2 (cf. figure 1). Le moyen 112 d'actionnement du premier dispositif d'excentrage 100 est solidarisé à l'arbre 102 du double arbre d'excentrage (cf. figure 3), tandis que les moyens de réglage 204 du deuxième dispositif d'excentrage 200 sont solidarisés au roulement excentrique 202 (cf. figure 6).The double eccentric shaft 102, 208 comprises a central shaft 102 which is surrounded by a tube 208 (cf. figure 7 ). This double shaft ensures the connection between the two sets of collars on one side 26 and on the other side 26 'of the printing unit 2 (cf. figure 1 ). The means 112 for actuating the first eccentric device 100 is secured to the shaft 102 of the double eccentric shaft (cf. figure 3 ), while the adjustment means 204 of the second offset device 200 are secured to the eccentric bearing 202 (cf. figure 6 ).

La figure 3 montre la structure du premier dispositif d'excentrage 100. La figure 3 est une vue de côté de l'unité d'impression 2 selon la flèche F de la figure 1, le montant 24 n'étant pas représenté. La figure 3 illustre donc le côté 26 ou « côté fonction » du système d'excentrage 5. Sur la figure 3, on distingue une flèche S qui indique la trajectoire de la bande de papier à travers l'unité d'impression 2 lors de l'impression.The figure 3 shows the structure of the first offset device 100. figure 3 is a side view of the printing unit 2 according to the arrow F of the figure 1 , the amount 24 not being represented. The figure 3 illustrates the side 26 or "function side" of the offset system 5. On the figure 3 , there is an arrow S which indicates the path of the paper web through the printing unit 2 during printing.

Le premier dispositif d'excentrage 100 comprend un vérin 114 qui est relié à un levier 116, le vérin 114 et le levier 116 formant ensemble les moyens d'actionnement 112. Le levier 116 est fixé sur l'arbre 102 du double arbre d'excentrage. L'arbre 102 est pourvu de deux leviers 118. 118'. L'extrémité éloignée de l'arbre 102 de chacun de ces leviers 118, 118' forme une première fourche qui accueille l'extrémité d'une biellette 120, montée pivotante sur cette première fourche. L'autre extrémité de la biellette 120, 120' est reliée au collier 107, 107' du cylindre porte-blanchet supérieur 10. La liaison entre l'extrémité de la biellette 120, 120' et le collier 107, 107' est assurée par une deuxième fourche 122, 122' formée sur le collier 107, 107'. De son côté sensiblement opposé à la deuxième fourche 122, 122', le collier 107, 107' dispose d'une troisième fourche 124, 124' qui accueille les extrémités de deux biellettes 126 et 128. Les biellettes 126, 126' et 128, 128' assurent la liaison respectivement au collier 109, 109' du cylindre porte-plaque supérieur 12 et au collier 104, 104' du cylindre porte-plaque inférieur 16. Les colliers 104, 107 et 109 sont respectivement fixés aux roulements 105, 103 et 101.The first offset device 100 comprises a jack 114 which is connected to a lever 116, the jack 114 and the lever 116 forming together the actuating means 112. The lever 116 is fixed on the shaft 102 of the double shaft. offset. The shaft 102 is provided with two levers 118, 118 '. The far end of the shaft 102 of each of these levers 118, 118 'forms a first fork which receives the end of a rod 120, pivotally mounted on the first fork. The other end of the rod 120, 120 'is connected to the collar 107, 107' of the upper blanket cylinder 10. The connection between the end of the rod 120, 120 'and the collar 107, 107' is provided by a second fork 122, 122 'formed on the collar 107, 107'. On its side substantially opposite to the second fork 122, 122 ', the collar 107, 107' has a third fork 124, 124 'which receives the ends of two links 126 and 128. The links 126, 126' and 128, 128 'provide the connection respectively to the collar 109, 109' of the upper plate cylinder 12 and the collar 104, 104 'of the lower plate cylinder 16. The collars 104, 107 and 109 are respectively fixed to the bearings 105, 103 and 101.

Le dispositif d'excentrage 100 est complété, de l'autre côté de l'unité d'impression 2, c'est-à-dire du côté commande 26', d'un deuxième ensemble de trois colliers 104', 107' et 109' fixés respectivement à des roulements excentriques 105', 103' et 101', ce deuxième ensemble de colliers étant identique au premier côté fonction 26 qui vient d'être décrit. La liaison entre ces deux jeux de colliers est assurée par l'arbre transversal 102 qui s'étend du côté fonction 26 au côté commande 26' (cf. figure 7).The offset device 100 is completed, on the other side of the printing unit 2, that is to say the control side 26 ', a second set of three collars 104', 107 'and 109 'respectively fixed to eccentric bearings 105', 103 'and 101', the second set of collars being identical to the first function side 26 which has just been described. The connection between these two sets of collars is provided by the transverse shaft 102 which extends from the function side 26 to the control side 26 '(cf. figure 7 ).

On va maintenant décrire le fonctionnement du dispositif d'excentrage 100, en référence à la figure 3. Lors de la détection d'une casse papier imprévue, les cylindres de l'unité d'impression 2 sont arrêtés. Les cylindres sont amenés dans une configuration hors impression dans laquelle le premier cylindre porte-plaque 12 est écarté du premier cylindre porte-blanchet 10 et le premier cylindre porte-blanchet 10 est écarté du cylindre de contre-pression 14.We will now describe the operation of the offset device 100, with reference to the figure 3 . When an unexpected paper break is detected, the cylinders of the printing unit 2 are stopped. The cylinders are brought into a non-printing configuration in which the first plate cylinder 12 is spaced from the first blanket cylinder 10 and the first blanket cylinder 10 is moved away from the backpressure cylinder 14.

Cette opération d'écartement des cylindres est déclenchée par l'activation du vérin 114. La bielle 130 du vérin 114 se déplace alors pour faire pivoter le levier 116 et avec lui l'arbre 102. Les leviers 118, 118' retracent ce pivotement et entraînent avec eux les biellettes 120, 120'. Les biellettes 120, 120' font ainsi pivoter les colliers 107, 107'. Ce mouvement de pivotement est transmis par les biellettes 126, 126' et 128, 128' aux colliers 104, 104' et 109, 109'. La transmission du mouvement aux colliers 104, 104' se fait par l'intermédiaire de triangles de renvoi 210, 210'. Lors de cette transmission, les triangles de renvoi 210, 210' tournent exclusivement autour d'un premier centre de rotation C1. Les six colliers 104, 104', 107, 107' et 109, 109' étant fixés aux roulements excentriques 105, 105', 103, 103' et 101, 101', on obtient ainsi une rotation des roulements excentriques, plus particulièrement des bagues médianes de ces roulements autour de leur axe de rotation, ce qui entraîne un mouvement d'écartement du cylindre porte-plaque inférieur 16, du cylindre porte-blanchet supérieur 10, ainsi que du cylindre porte-plaque supérieur 12.This cylinder spacing operation is triggered by the activation of the cylinder 114. The rod 130 of the cylinder 114 then moves to pivot the lever 116 and with it the shaft 102. The levers 118, 118 'retrace this pivoting and carry with them the rods 120, 120 '. The rods 120, 120 'thus rotate the collars 107, 107'. This pivoting movement is transmitted by the rods 126, 126 'and 128, 128' to the collars 104, 104 'and 109, 109'. The transmission of the movement to the collars 104, 104 'is via return triangles 210, 210'. During this transmission, the return triangles 210, 210 'rotate exclusively around a first center of rotation C1. The six collars 104, 104 ', 107, 107' and 109, 109 'being fixed to the eccentric bearings 105, 105', 103, 103 'and 101, 101', thus obtaining a rotation of the eccentric bearings, more particularly the rings. medians of these bearings about their axis of rotation, which causes a movement of the spacing of the lower plate cylinder 16, the upper blanket cylinder 10, and the upper plate cylinder 12.

Avec les cylindres ainsi écartés, on peut alors facilement enlever le papier qui s'est enroulé autour des cylindres à cause de la casse papier. Les colliers 206, 206' et leur cylindre porte-blanchet inférieur associé restent immobiles lors de l'activation du premier dispositif d'excentrage 100. En effet, le dispositif d'excentrage 100 ne fait que bouger le cylindre porte-plaque inférieur 16, le cylindre porte-blanchet supérieur 10 et le cylindre porte-plaque supérieur 12.With the rolls thus spaced, it is then easy to remove the paper which has wrapped around the rolls because of the paper breakage. The collars 206, 206 'and their associated lower-blanket cylinder remain stationary during the activation of the first offset device 100. Indeed, the eccentric device 100 only moves the lower plate cylinder 16, the upper blanket cylinder 10 and the upper plate cylinder 12.

Une fois que le papier cassé a été enlevé des cylindres, on pourra alors réactiver le vérin 114 qui effectuera un mouvement en translation inverse pour amener les cylindres dans leur configuration d'impression.Once the broken paper has been removed from the cylinders, then the cylinder 114 can be reactivated which will perform a reverse translation movement to bring the cylinders into their printing configuration.

En référence aux figures 4 à 7, on va maintenant décrire le mode de réalisation préféré du deuxième dispositif d'excentrage 200 selon l'invention.With reference to Figures 4 to 7 the preferred embodiment of the second offset device 200 according to the invention will now be described.

Le deuxième dispositif d'excentrage 200 comprend principalement des moyens de réglage 204 montrés à la figure 4, deux roulements excentriques 202, 202' (cf. la figure 6) de part et d'autre de l'unité d'impression 2, ces roulements excentriques accueillant les extrémités de l'arbre d'entraînement du cylindre porte-blanchet inférieur 14, et des moyens assurant le lien entre d'une part les deux roulements excentriques 202, 202' et d'autre part, entre le deuxième dispositif d'excentrage 200 et le premier dispositif d'excentrage 100.The second offset device 200 mainly comprises adjustment means 204 shown in FIG. figure 4 two eccentric bearings 202, 202 '(see figure 6 ) on either side of the printing unit 2, these eccentric bearings receiving the ends of the drive shaft of the lower blanket cylinder 14, and means ensuring the connection between the two eccentric bearings 202, 202 'and secondly, between the second offset device 200 and the first offset device 100.

En référence à la figure 4, on aperçoit les moyens de réglage 204. Ceux-ci sont agencés sur la face externe 28 du montant 24 du bâti 4 (cf. la figure 1). Un bouton de réglage tournant 222 est monté sur un arbre à cardan fileté 220. Au bout de cet arbre fileté 220 est monté un écrou à taraudage 218 fixé sur une bride pivotante 216. La bride pivotante 216 est liée au roulement excentrique 202, qui sur la figure 4, se trouve cachée derrière la bride 216 et est aménagé dans le montant 24 du bâti 4. Comme on le distingue à la figure 5, le roulement excentrique 202 est relié, de son côté opposé, au collier 206 du cylindre porte-blanchet inférieur 14.With reference to the figure 4 the adjustment means 204. These are arranged on the outer face 28 of the upright 24 of the frame 4 (see FIG. figure 1 ). A rotary adjusting knob 222 is mounted on a threaded cardan shaft 220. At the end of this threaded shaft 220 is mounted a tapping nut 218 fixed to a pivoting flange 216. The pivoting flange 216 is connected to the eccentric bearing 202, which on the figure 4 is hidden behind the flange 216 and is arranged in the upright 24 of the frame 4. As can be seen in FIG. figure 5 the eccentric bearing 202 is connected on its opposite side to the collar 206 of the lower blanket cylinder 14.

La figure 6 est une coupe transversale à travers le montant 24 du bâti 4, montrant en détail les liaisons entre la bride 216, le roulement excentrique 202 et le collier 206. En référence à la figure 6, le roulement excentrique 202 est un roulement à trois bagues, avec une bague interne 224, une bague médiane 226, et une bague externe 228. La bague interne 224 est fixée à une extrémité 22 de l'arbre d'entraînement du cylindre porte-blanchet inférieur 14. L'extrémité 22 de l'arbre d'entraînement est apte à tourner, ensemble avec la bague interne 224, à l'intérieur du roulement excentrique 202 par rapport à des corps roulants tels que des aiguilles 230.The figure 6 is a cross-section through the upright 24 of the frame 4, showing in detail the connections between the flange 216, the eccentric bearing 202 and the collar 206. Referring to FIG. figure 6 the eccentric bearing 202 is a three-ring bearing, with an inner ring 224, a middle ring 226, and an outer ring 228. The inner ring 224 is attached to one end 22 of the drive shaft of the carrier cylinder. lower blanket 14. The end 22 of the drive shaft is rotatable, together with the inner ring 224, inside the eccentric bearing 202 relative to rolling bodies such as needles 230.

La bague médiane 226 est fixée d'un côté à la bride 216 et de l'autre côté au collier 206. La bague interne 224 est légèrement excentrée par rapport à la bague médiane 226, de l'ordre de 1 mm. La bague médiane 226 et la bague externe 228 forment ensemble un palier lisse, c'est-à-dire que la bague médiane 226 est apte à effectuer une rotation par glissement par rapport à la bague externe 228, cette bague externe 228 étant fixée au montant 24 du bâti 4.The middle ring 226 is fixed on one side to the flange 216 and on the other side to the collar 206. The inner ring 224 is slightly eccentric with respect to the middle ring 226, of the order of 1 mm. The middle ring 226 and the outer ring 228 together form a sliding bearing, that is to say that the middle ring 226 is able to perform a rotation by sliding relative to the outer ring 228, this outer ring 228 being fixed to the amount 24 of the frame 4.

La structure du roulement excentrique 202' située du côté commande 26' de l'unité d'impression 2 est identique à la structure du roulement excentrique 202 qui vient d'être décrit. Le collier 206' du côté commande 26' est fixé de la même manière au roulement excentrique 202' que le collier 206 au roulement excentrique 202. Bien entendu, les moyens de réglage 204 ne sont pas reproduits du côté commande 26'.The structure of the eccentric bearing 202 'located on the control side 26' of the printing unit 2 is identical to the structure of the eccentric bearing 202 which has just been described. The drive side collar 206 'is affixed in the same manner to the eccentric bearing 202' as the collar 206 to the eccentric bearing 202. Of course, the adjustment means 204 are not reproduced on the control side 26 '.

En référence à la figure 3, le collier 206 a un aspect sensiblement annulaire, mis à part deux fourches 232 et 234, l'une étant sensiblement à l'opposé de l'autre. La fourche 232 est solidarisée à un triangle de renvoi 210 qui assure le couplage avec le premier dispositif d'excentrage 100. En effet, le triangle de renvoi 210 est solidarisé par la biellette 106 au collier 104 et donc au roulement excentrique 105 du premier dispositif d'excentrage 100. En d'autres termes, le deuxième dispositif d'excentrage 200 utilise les éléments 104, 105 et 106 du premier dispositif d'excentrage 100. Ces éléments font donc partie des deux dispositifs d'excentrage à la fois.With reference to the figure 3 , the collar 206 has a substantially annular appearance, apart from two forks 232 and 234, one being substantially opposite the other. The fork 232 is secured to a deflection triangle 210 which provides coupling with the first offset device 100. Indeed, the deflection triangle 210 is secured by the rod 106 to the collar 104 and thus to the eccentric bearing 105 of the first device In other words, the second offset device 200 uses the elements 104, 105 and 106 of the first offset device 100. These elements are therefore part of both offset devices at a time.

Le triangle de renvoi 210 est constitué de trois sommets A, B, C reliés par des segments droits S1, S2, S3. La fourche 234 accueille l'extrémité d'une biellette 236, cette biellette 236 étant reliée par son autre extrémité à un levier 238.The deflection triangle 210 consists of three vertices A, B, C connected by straight segments S1, S2, S3. The fork 234 accommodates the end of a link 236, this link 236 being connected at its other end to a lever 238.

En référence à la figure 7, le levier 238 est monté sur un tube 208 qui est libre en rotation autour de l'arbre 102 du premier dispositif d'excentrage 100. Le levier 238 est monté sur le tube 208 au niveau de l'extrémité située du côté fonction 26 de l'unité d'impression 2. A l'autre extrémité du tube 208, on retrouve un levier 238' identique au levier 238. Les éléments reliés au levier 238', à savoir la biellette 236', le collier 206' et le roulement excentrique 202' (non représenté à la figure 7) sont des reproductions identiques des éléments correspondants du côté fonction 26 qui assurent un écartement identique de l'autre extrémité de l'arbre d'entraînement du cylindre porte-blanchet inférieur 14. La reproduction des mêmes éléments du côté fonction 26 et du côté commande 26', reliés par le tube 208, permet un déplacement homogène de part et d'autre du cylindre porte-blanchet inférieur 14.With reference to the figure 7 the lever 238 is mounted on a tube 208 which is free to rotate about the shaft 102 of the first eccentric device 100. The lever 238 is mounted on the tube 208 at the end of the function side 26 of the the printing unit 2. At the other end of the tube 208, there is a lever 238 'identical to the lever 238. The elements connected to the lever 238', namely the rod 236 ', the collar 206' and the bearing eccentric 202 '(not shown in figure 7 ) are identical reproductions of the corresponding function-side elements 26 which provide identical spacing of the other end of the lower blanket cylinder drive shaft 14. The reproduction of the same elements of the function-side 26 and the control side 26 ', connected by the tube 208, allows a homogeneous displacement on either side of the lower blanket cylinder 14.

On va maintenant décrire le fonctionnement du deuxième dispositif d'excentrage 200.The operation of the second offset device 200 will now be described.

Supposons qu'un opérateur désire lancer une impression avec un papier d'épaisseur donnée en utilisant l'unité d'impression 2 selon l'invention. Avant de démarrer l'impression, l'opérateur réglera la distance entre le cylindre porte-blanchet inférieur 14 et le cylindre porte-blanchet supérieur 10 en fonction de l'épaisseur du papier à imprimer grâce au deuxième dispositif d'excentrage 200 selon l'invention.Suppose that an operator wishes to print with a paper of a given thickness using the printing unit 2 according to the invention. Before starting printing, the operator will set the distance between the lower blanket cylinder 14 and the upper blanket cylinder 10 according to the thickness of the paper to be printed by the second offset device 200 according to the invention.

A cet effet, l'opérateur tournera le bouton tournant 222 d'un angle désiré (cf. figure 4). Ce mouvement de rotation est reproduit par l'arbre à cardan 220. L'arbre 220 étant uniquement libre en rotation mais non en translation, sa rotation aura l'effet, par l'intermédiaire de son filetage en prise avec le taraudage complémentaire de l'écrou 218, à faire avancer ou reculer l'écrou 218, comme cela est indiqué sur la figure 4 par la double flèche G. Ce mouvement G se traduit par un pivotement de la bride 216 et donc de la bague médiane 226 et du collier 206 (cf. la figure 6). Ce pivotement est transmis par l'intermédiaire du tube 208 de l'autre côté 26' de l'unité d'impression 2 et résulte en un pivotement correspondant de la bague médiane 226' du roulement excentrique 202'. Les extrémités 22, 22' de l'arbre d'entraînement du cylindre porte-blanchet inférieur 14 étant logées de façon légèrement excentrée à l'intérieur des roulements 202, 202', un pivotement de ces roulements résulte en un léger déplacement radial du cylindre porte-blanchet inférieur 14 par rapport au cylindre porte-blanchet supérieur 10. Dans ce contexte, on entend par « déplacement radial » un déplacement du cylindre perpendiculairement à son axe longitudinal, c'est-à-dire un déplacement le long d'un rayon du cylindre.For this purpose, the operator will turn the rotary knob 222 by a desired angle (cf. figure 4 ). This rotational movement is reproduced by the cardan shaft 220. The shaft 220 being only free in rotation but not in translation, its rotation will have the effect, through its threading engaged with the complementary thread of the 218, to advance or retreat the nut 218, as indicated on the figure 4 by the double arrow G. This movement G results in a pivoting of the flange 216 and thus of the middle ring 226 and the collar 206 (see FIG. figure 6 ). This pivoting is transmitted through the tube 208 on the other side 26 'of the printing unit 2 and results in a corresponding pivoting of the middle ring 226' of the eccentric bearing 202 '. The ends 22, 22 'of the drive shaft of the lower blanket cylinder 14 being housed slightly eccentrically inside the bearings 202, 202', a pivoting of these bearings results in a slight radial displacement of the cylinder lower blanket holder 14 relative to the upper blanket cylinder 10. In this context, the term "radial displacement" means a displacement of the cylinder perpendicular to its longitudinal axis, that is to say a displacement along a radius of the cylinder.

La cinématique de liaison des triangles de renvoi 210, 210' (cf. les figures 3 et 7) assure un contact permanent entre le cylindre porte-blanchet inférieur 14 et le cylindre porte-plaque inférieur 16 lors du réglage à l'aide du dispositif d'excentrage 200. Lors de ce réglage, les triangles de renvoi 210, 210' tournent exclusivement autour d'un deuxième centre de rotation C2, distinct du premier centre de rotation C1 (cf. la figure 3).The linking kinematics of the return triangles 210, 210 '(see figures 3 and 7 ) ensures a permanent contact between the lower blanket cylinder 14 and the lower plate cylinder 16 during adjustment with the aid of the offset device 200. In this adjustment, the return triangles 210, 210 'rotate exclusively around a second center of rotation C2, distinct from the first center of rotation C1 (see figure 3 ).

Le réglage à l'aide du dispositif d'excentrage 200 ne doit pas résulter en un mouvement relatif entre le cylindre porte-blanchet inférieur 14 et le cylindre porte-plaque inférieur 16. Sinon, la transmission correcte de l'image du cylindre porte-plaque inférieur 16 au cylindre porte-blanchet inférieur 14 lors de l'impression à intervenir après le réglage pourrait être compromise. Grâce aux triangles de renvoi 210, 210', le mouvement de pivotement des colliers 206, 206' du cylindre porte-blanchet inférieur 14 est reproduit par les colliers 104, 104' du cylindre porte-plaque inférieur 16, de telle façon que le cylindre porte-plaque inférieur 16 suit le mouvement du cylindre porte-blanchet inférieur 14 pour annuler tout mouvement relatif entre les deux cylindres.The adjustment with the offset device 200 must not result in a relative movement between the lower blanket cylinder 14 and the lower plate cylinder 16. Otherwise, the correct transmission of the cylinder image lower plate 16 to the lower blanket cylinder 14 when printing to occur after the setting could be compromised. Thanks to the return triangles 210, 210 ', the pivoting movement of the collars 206, 206' of the lower blanket cylinder 14 is reproduced by the collars 104, 104 'of the lower plate cylinder 16, so that the cylinder Lower plate holder 16 follows the movement of the lower blanket cylinder 14 to cancel any relative movement between the two cylinders.

Les figures 8 à 11 illustrent le comportement des différents éléments des deux dispositifs d'excentrage 100 et 200 lors de leur actionnement. Les figures 8 à 11 illustrent les éléments situés du côté fonction 26 de l'unité d'impression 2. Les éléments correspondants situés de l'autre côté 26' ont le même comportement que les éléments des figures 8 à 11.The Figures 8 to 11 illustrate the behavior of the different elements of the two offset devices 100 and 200 during their actuation. The Figures 8 to 11 illustrate the elements situated on the function side 26 of the printing unit 2. The corresponding elements situated on the other side 26 'have the same behavior as the elements of the Figures 8 to 11 .

On distingue le cylindre porte-plaque inférieur 16 avec son collier 104, le cylindre porte-blanchet inférieur 14 avec son collier 206, ainsi que le cylindre porte-blanchet supérieur 10 avec son collier 107. Le cylindre porte-plaque supérieur n'est pas représenté.The bottom plate cylinder 16 can be distinguished with its collar 104, the lower blanket cylinder 14 with its collar 206, as well as the upper blanket cylinder 10 with its collar 107. The upper plate cylinder is not represent.

La figure 8 montre les cylindres dans leur état opérationnel, le premier dispositif d'excentrage 100 n'ayant pas été activé et le deuxième dispositif d'excentrage 200 se trouvant en mode de réglage « mini », où la distance L entre la surface cylindrique 18 du cylindre porte blanchet supérieur 10 et la surface cylindrique 20 du cylindre porte-blanchet inférieur 14 est sensiblement égale à 0 mm. On notera que la distance D entre la surface cylindrique du cylindre porte-blanchet inférieur 14 et la surface cylindrique du cylindre porte-plaque inférieur 16 est également sensiblement égale à 0 mm.The figure 8 shows the cylinders in their operational state, the first offset device 100 having not been activated and the second offset device 200 being in "mini" adjustment mode, where the distance L between the cylindrical surface 18 of the cylinder upper blanket door 10 and the cylindrical surface 20 of the lower blanket cylinder 14 is substantially equal to 0 mm. It will be noted that the distance D between the cylindrical surface of the lower blanket cylinder 14 and the cylindrical surface of the lower plate cylinder 16 is also substantially equal to 0 mm.

Dans ce contexte, on entend par « surface cylindrique » la surface de révolution du cylindre s'étendant d'un montant du bâti 4 à l'autre.In this context, the term "cylindrical surface" the surface of revolution of the cylinder extending from one amount of the frame 4 to the other.

L'état montré à la figure 9 correspond à l'état montré à la figure 8, à la différence près que le premier dispositif d'excentrage 100 a été activé. Cette activation amène un pivotement du levier 118 et par conséquent des colliers 107 et 104, ce qui engendre un écartement des cylindres 10 et 16 par rapport au cylindre 14. Le cylindre 14 et son collier associé 206 n'ont en revanche pas bougé. De cet écartement résulte une valeur de L et de D d'environ 1,5 mm.The state shown at figure 9 corresponds to the state shown in the figure 8 , with the difference that the first offset device 100 has been activated. This activation causes a pivoting of the lever 118 and therefore the collars 107 and 104, which causes a spacing of the cylinders 10 and 16 relative to the cylinder 14. The cylinder 14 and its associated collar 206 on the other hand have not moved. From this spacing results a value of L and D of about 1.5 mm.

La figure 10 montre à nouveau un état opérationnel, mais dans ce cas de figure, l'opérateur a actionné le dispositif d'excentrage 200 pour régler la distance entre les deux cylindres porte-blanchet 10 et 14 en mode « maxi », L ayant alors une valeur d'environ 0,3 mm. Ce réglage est adapté pour optimiser la qualité d'impression sur du papier épais. On constate que le collier 206 du cylindre porte-blanchet inférieur 14, et avec lui le roulement 202, ont pivoté d'un angle a par rapport à la position représentée à la figure 8. Grâce au triangle de renvoi 210, le cylindre porte-plaque inférieur 16 a suivi le mouvement du cylindre porte-blanchet inférieur 14, de telle manière que la distance D est toujours sensiblement égale à 0 mm.The figure 10 again shows an operational state, but in this case, the operator has actuated the offset device 200 to adjust the distance between the two blanket cylinders 10 and 14 in "maxi" mode, L having then a value about 0.3 mm. This setting is suitable for optimizing the print quality on thick paper. It is found that the collar 206 of the lower blanket cylinder 14, and with it the bearing 202, have pivoted by an angle with respect to the position shown in FIG. figure 8 . Thanks to the deflection triangle 210, the lower plate cylinder 16 has followed the movement of the blanket cylinder lower 14, so that the distance D is always substantially equal to 0 mm.

La figure 11 correspond à la figure 10, le dispositif d'excentrage 100 ayant été activé. La distance L est alors égale à environ 1, 5 mm, tandis que la distance D est égale à environ 1,65 mm. On constate que l'activation du dispositif d'excentrage 100, lorsque le dispositif d'excentrage 200 se trouve en mode de réglage « maxi », résulte en un écartement D entre le cylindre porte-blanchet inférieur 14 et le cylindre porte-plaque inférieur 16 (cf. la figure 11) qui est supérieur à l'écartement D obtenu lors de l'activation du dispositif d'excentrage 100 quand le dispositif d'excentrage 200 est en mode de réglage « mini ».The figure 11 corresponds to the figure 10 , the offset device 100 having been activated. The distance L is then equal to about 1.5 mm, while the distance D is equal to about 1.65 mm. It can be seen that the activation of the offset device 100, when the offset device 200 is in "maximum" adjustment mode, results in a gap D between the lower blanket cylinder 14 and the lower plate cylinder 16 (see the figure 11 ) which is greater than the distance D obtained when activating the offset device 100 when the offset device 200 is in "mini" adjustment mode.

Les figures 12 à 14 illustrent des variantes de réalisation du dispositif d'excentrage 200. Dans les trois cas, il s'agit de représentations des éléments du côté fonction 26.The Figures 12 to 14 illustrate alternative embodiments of the offset device 200. In all three cases, these are representations of the elements of the function side 26.

La variante selon la figure 12 est différente de la solution préférée décrite précédemment par la forme du triangle de renvoi 210 et des biellettes associées. En effet, dans la solution selon la figure 12, le triangle de renvoi 210 a sensiblement la forme d'un boomerang avec un coude K et deux branches B1 et B2.The variant according to figure 12 is different from the preferred solution described above by the shape of the deflection triangle 210 and associated rods. Indeed, in the solution according to figure 12 , the deflection triangle 210 has substantially the shape of a boomerang with a bend K and two branches B1 and B2.

La branche B2 est directement liée au collier 104 du cylindre porte-plaque inférieur 16, tandis que la branche B1 est reliée au collier 206 du cylindre porte-blanchet inférieur 14 par l'intermédiaire d'une biellette 212. Ainsi, par rapport à la solution préférée décrite ci-dessus, la biellette 106 se trouve supprimée et la biellette 128 rallongée.The branch B2 is directly connected to the collar 104 of the lower plate cylinder 16, while the branch B1 is connected to the collar 206 of the lower blanket cylinder 14 via a link 212. Thus, compared to the preferred solution described above, the rod 106 is removed and the link 128 extended.

Dans la variante selon la figure 13, on recourt aussi à un triangle de renvoi 210 sous forme de boomerang avec un sommet K et deux branches B1 et B2. En revanche, le triangle de renvoi selon la figure 13 a une forme de courbe continue, en contraste avec le triangle de renvoi selon la figure 12 qui est constitué de deux segments droits reliés par un coin. Selon la figure 13, la branche B2 est reliée au collier 104 par l'intermédiaire de la biellette 106. Le coude K est directement relié au collier 206.In the variant according to figure 13 , we also use a boomerang triangle 210 with a vertex K and two branches B1 and B2. In contrast, the crossover triangle figure 13 has a shape of continuous curve, in contrast with the triangle of reference according to the figure 12 which consists of two straight segments connected by a corner. According to figure 13 the branch B2 is connected to the collar 104 via the rod 106. The elbow K is directly connected to the collar 206.

Dans la variante selon la figure 14, on remplace le roulement excentrique à trois bagues du cylindre porte-plaque inférieur par un nouveau roulement excentrique à quatre bagues 108. Une première bague 110 de ce nouveau roulement 108 fait partie du premier dispositif d'excentrage 100 et est reliée à celui-ci par une biellette 132. Une seconde bague 214 de ce nouveau roulement 108 fait partie du deuxième dispositif d'excentrage 200 et est reliée à celui-ci par une biellette 240. Dans une variante non représentée, le rôle des bagues 110 et 214 est inversé, c'est-à-dire que la bague 110 fait alors partie du deuxième dispositif d'excentrage, tandis que la bague 214 fait partie du premier dispositif d'excentrage. C'est ce nouveau roulement à quatre bagues 108 qui assure le couplage entre le premier dispositif d'excentrage 100 et le deuxième dispositif d'excentrage 200.In the variant according to figure 14 the three-ring eccentric bearing of the lower plate cylinder is replaced by a new four-ring eccentric bearing 108. A first ring 110 of this new bearing 108 is part of the first offset device 100 and is connected thereto by a rod 132. A second ring 214 of this new bearing 108 is part of the second offset device 200 and is connected thereto by a link 240. In a variant not shown, the role of the rings 110 and 214 is reversed, that is to say that the ring 110 is then part of the second offset device, while the ring 214 is part of the first device runout. It is this new four-ring bearing 108 which provides the coupling between the first offset device 100 and the second offset device 200.

Une comparaison de la solution préférée avec celle des figures 12 à 14 montre que la solution préférée selon les figures 1 à 11 permet à la fois une grande précision, une facilité de réglage, un usinage facile, un encombrement minimal, ainsi que des efforts et des coûts réduits.A comparison of the preferred solution with that of Figures 12 to 14 shows that the preferred solution according to Figures 1 to 11 allows both high accuracy, ease of adjustment, easy machining, minimal footprint, as well as reduced effort and cost.

Le système d'excentrage 5 pour unités d'impression 2 qui vient d'être décrit, combinant un premier dispositif 100 d'excentrage des cylindres avec un deuxième dispositif 200 de réglage de la distance entre les cylindres porte-blanchet, a en particulier les avantages suivants :

  • il permet le réglage de la distance entre les cylindres porte-blanchet selon l'épaisseur du papier utilisé, tout en conservant les contacts entre les cylindres porte-blanchet et les cylindres porte-plaque avant le démarrage de l'unité d'impression ;
  • la fonction connue de l'art antérieur d'écartement des cylindres lors d'une casse papier est conservée ;
  • le réglage de la distance entre les cylindres porte-blanchet est particulièrement facile ;
  • on a su garder un maximum de pièces existantes du premier dispositif d'excentrage 100 ;
  • on a su utiliser de façon efficace les espaces vides de l'unité d'impression ;
  • on est resté dans une plage d'efforts réaliste pour chaque pièce ; et
  • on a su conserver le réglage du travers.
The offset system 5 for printing units 2 which has just been described, combining a first device 100 for offsetting the rolls with a second device 200 for adjusting the distance between the blanket cylinders, has in particular the following advantages:
  • it allows the adjustment of the distance between the blanket cylinders according to the thickness of the paper used, while maintaining the contacts between the blanket cylinders and the plate cylinders before the start of the printing unit;
  • the known function of the prior art of spacing the rolls during a paper break is retained;
  • adjusting the distance between the blanket cylinders is particularly easy;
  • it was possible to keep a maximum of existing parts of the first offset device 100;
  • it has been possible to effectively use the empty spaces of the printing unit;
  • we stayed in a realistic range of efforts for each piece; and
  • we have kept the adjustment of the cross.

Claims (18)

  1. A printing unit (2) comprising:
    - a frame (4);
    - a first print set (6) having a first blanket cylinder (10) and a first plate cylinder (12);
    - a second print set (8) comprising a second plate cylinder (16) and a second blanket cylinder (14);
    - a first spacing device (100) designed to move the cylinders relative to each other between a printing configuration in which the first plate cylinder (12) is in contact with the first blanket cylinder (10), and a non-printing configuration in which the first plate cylinder (12) is moved away from the first blanket cylinder (10) and the first blanket cylinder (10) is moved away from the second blanket cylinder (14), and
    - a second spacing device (200) designed to adjust the distance (L) between cylindrical surfaces (18, 20) of the first blanket cylinder (10) and the second blanket cylinder (14), the second spacing device (200) comprising means for moving the second blanket cylinder (14) radially relative to the first blanket cylinder (10) and relative to the frame (4),
    in which, in the printing configuration, the second plate cylinder (16) is in contact with the second blanket cylinder (14), and in the non-printing configuration, the second plate cylinder (16) is moved away from the second blanket cylinder (14),
    characterized in that the second spacing device (200) comprises return means (104, 105, 106, 210) designed to move the second plate cylinder (16) synchronously with the second blanket cylinder (14) when the distance (L) is adjusted, such that the second plate cylinder (16) maintains contact with the second blanket cylinder (14) in the printing configuration.
  2. The printing unit according to claim 1, characterized in that the first print set is an upper print set (6) and the second print set is a lower print set (8), the first plate cylinder being an upper plate cylinder (12) and the first blanket cylinder being an upper blanket cylinder (10), the second blanket cylinder being a lower blanket cylinder (14) and the second plate cylinder being a lower plate cylinder (16).
  3. The printing unit according to any one of claims 1 or 2, characterized in that the first spacing device (100) is designed to move the first and second plate cylinders (12, 16) and the first blanket cylinder (10) between the printing configuration and the non-printing configuration, and in that the second blanket cylinder (14) remains immobile during that movement.
  4. The printing unit according to any one of the preceding claims, characterized in that the first spacing device (100) includes eccentric bearings.
  5. The printing unit according to any one of the preceding claims, characterized in that the second spacing device (200) is an off center moving device and comprises:
    - two eccentric bearings (202, 202') housed in the frame, each eccentric bearing receiving one end (22, 22') of the impression cylinder (14); and
    - adjusting means (204) designed to adjust the angular position (a) of each eccentric bearing (202, 202') in relation to the frame (4).
  6. The printing unit according to claim 5, characterized in that the second spacing device (200) comprises transmission means (208) designed to transmit an adjustment movement, applied by the adjusting means (204) on one of the bearings (202, 202') situated on one side of the frame, to the other bearing situated on another side of the frame.
  7. The printing unit according to claim 6, characterized in that the first spacing device (100) comprises a shaft (102) extending between two posts (24, 24') of the frame (4), and in that the transmission means comprises a tube (208) surrounding said shaft.
  8. The printing unit according to any one of the preceding claims, characterized in that the return means comprises at least part (104, 105, 106) of the first spacing device (100).
  9. The printing unit according to claim 5, 6 or 7 in combination with claim 8, characterized in that the second spacing device (200) comprises a first collar (206, 206') fastened to the eccentric bearing (202, 202') and the return means comprises a member (210, 210') for returning a movement of this first collar (206, 206') to said portion of the first spacing device (100).
  10. The printing unit according to claim 9, characterized in that the first spacing device (100) comprises a second collar (104, 104') associated with the second plate cylinder (16), and in that the return means comprises this second collar (104, 104'), the first collar (206, 206') being connected to the second collar (104, 104') via the return member (210, 210').
  11. The printing unit according to claim 10, characterized in that the return member (210, 210') defines a first center of rotation (C1) around which it turns exclusively when the first spacing device (100) is actuated and a second center of rotation (C2), separate from the first center of rotation (C1), around which it turns exclusively when the second spacing device (200) is adjusted.
  12. The printing unit according to claim 10 or 11, characterized in that the return element (210, 210') is connected to the second collar (104, 104') by a connecting rod (106, 106'), and in that the return member (210, 210') is connected to the first collar (206, 206') by an extension (207, 207') of the first collar.
  13. The printing unit according to claim 10 or 11, characterized in that the return member (210, 210') is connected to the first collar (206, 206') by a connecting rod (212, 212'), and in that the return member (210, 210') is connected to the second collar (104, 104') by an extension (209, 209') of the second collar.
  14. The printing unit according to any one of claims 10 to 13, characterized in that the return member (210, 210') is a return triangle that is either made up of three apices (A, B, C) connected by straight segments (S1, S2, S3), or made up of two arms (B1, 82) connected by a bend (K).
  15. The printing unit according to any one of claims 1 to 7, wherein the second plate cylinder is associated with an eccentric bearing with four rings (108), a first ring (110) of said bearing being part of the first spacing device, a second ring (214) of said bearing being part of the second spacing device.
  16. The printing unit according to at least claim 5, wherein the adjusting means (204) comprises:
    - a pivoting flange (216) connected to the eccentric bearing;
    - a tapping (218) connected to the pivoting flange;
    - a threaded rod (220) engaged with the tapping; and
    - means (222) for driving the rotation of the threaded rod,
    actuating this drive means causing the eccentric bearing (202, 202') to rotate.
  17. The printing unit according to any one of the preceding claims, characterized in that the second spacing device (200) makes it possible to adjust the distance (L) to a value exclusively between 0 and 0.3 mm.
  18. A use of a printing unit according to any one of the preceding claims, characterized in that it comprises a step for adjusting the distance (L) between the first blanket cylinder (10) and the impression cylinder (14) via the second spacing device (200) as a function of the thickness of the paper between the first blanket cylinder and the impression cylinder.
EP09766046A 2008-05-28 2009-05-22 Printing unit with two spacer devices and corresponding use Not-in-force EP2300231B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0853476A FR2931723B1 (en) 2008-05-28 2008-05-28 PRINTING UNIT WITH TWO SPLIT DEVICES AND CORRESPONDING USE THEREOF.
PCT/FR2009/050950 WO2009153484A1 (en) 2008-05-28 2009-05-22 Printing unit with two spacer devices and corresponding use

Publications (2)

Publication Number Publication Date
EP2300231A1 EP2300231A1 (en) 2011-03-30
EP2300231B1 true EP2300231B1 (en) 2012-11-07

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US (1) US20110139023A1 (en)
EP (1) EP2300231B1 (en)
JP (1) JP2011521810A (en)
CN (1) CN102089149B (en)
FR (1) FR2931723B1 (en)
WO (1) WO2009153484A1 (en)

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US10078294B2 (en) 2014-06-30 2018-09-18 Hp Indigo B.V. Contact control of print blanket to impression drum
CN104401125B (en) * 2014-11-05 2016-05-18 江苏南风地暖科技有限公司 Intaglio press safety device

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JP2011521810A (en) 2011-07-28
WO2009153484A1 (en) 2009-12-23
FR2931723A1 (en) 2009-12-04
FR2931723B1 (en) 2011-05-20
EP2300231A1 (en) 2011-03-30
CN102089149B (en) 2013-01-23
US20110139023A1 (en) 2011-06-16
CN102089149A (en) 2011-06-08

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