EP1075943B1 - Printing device - Google Patents

Description

The invention relates to a printing unit for a web-fed rotary printing machine with a plurality of guide elements to each other adjustable, each having its own drive motor printing cylinders, of which at least one is a forme cylinder.

The EP 0764 523 A1 shows a double printing unit with two adjusable transfer cylinders and two form cylinders. The diameter of the cylinder should be able to vary. For this purpose, three cylinders are arranged displaceably on associated guides. One of the four cylinders is stationary.

The US Pat. No. 5,806,427 shows a double printing unit, in which each of the juxtaposed transfer cylinder two form cylinder are assigned, which are alternatively brought into contact with the respectively associated transfer cylinder, wherein an inking unit and dampening unit is adjustable. For this purpose, the two forme cylinders are accommodated on a common carriage, which can be moved on a straight guide, which runs parallel to a tangent to the associated transfer cylinder and is so long that each of the two forme cylinders can be brought into contact with the transfer cylinder, while the other one Form cylinder is turned off. At one end of the displacement of the carriage thus a form cylinder is placed in contact with the transfer cylinder while the other form cylinder and vice versa. The applicator rollers of the inking unit and the dampening unit are pivotably arranged and are turned on and off by a corresponding swiveling movement on the forme cylinder placed in contact with the transfer cylinder. The displacement of the forme cylinder is not involved in this arrival or Abstellbewegung.

The DE-A 3 246 938 shows a high-pressure or flexo printing unit with a relative to a counter-pressure cylinder movable form cylinder and a relative to this sliding inking roller. The forme cylinder is accommodated on a slide displaceably mounted in the machine housing. The inking roller is mounted on a carriage slidably received on the carriage of the forme cylinder. When the form cylinder is employed on the impression cylinder, the inking roller can be brought into engagement only by its own adjustment with the forme cylinder. An additional printing technical device with which the form cylinder can be brought into operative engagement by its own displacement on its guide, is in the DE-A 3 246 938 unavailable.

The invention has the object of providing a generic printing unit in such a way that each form cylinder with simple means and high precision in contact with an additional device required for printing can be brought.

This is achieved by applying the measures of claim 1 according to the invention.

Figur 1

eine Seitenansicht eines ersten Ausführungsbeispiels,

Figur 2

einen teilweisen Schnitt durch die Mittel zur Führung und Anstellung eines Druckwerkszylinders,

Figur 3

ein zweites Ausführungsbeispiel,

Figur 4

ein drittes Ausführungsbeispiel und

Figur 5

ein letztes Ausführungsbeispiel jeweils in einer der Figur 1 entsprechenden Darstellung.

Further features and advantages of the invention will become apparent from the dependent claims and the description of some embodiments with reference to the drawing. In the drawings show schematically

FIG. 1

a side view of a first embodiment,

FIG. 2

a partial section through the means for guiding and employment of a printing cylinder,

FIG. 3

a second embodiment,

FIG. 4

a third embodiment and

FIG. 5

a final embodiment in each case in one of FIG. 1 corresponding representation.

FIG. 1 shows a printing unit with a machine frame carrier 1 and four printing cylinders, of which the two outer form cylinder 2, 3 and the two inner transfer cylinders 4, 5, between which passes through a printing substrate 6, which is printed on both sides. Each of the printing cylinder 2 to 6 is rotatably mounted in a carriage 7 to 10. Each of the slides 7 to 10 receives a drive motor, not shown, for a printing cylinder. Such drive motors are from the post-published documents DE 199 37 796 A1 and DE 199 37 783 A1 removable.

For guiding each carriage 7 to 10 guide elements 11 to 14 are provided. The guide elements 11, 12 on the one hand and 13, 14 on the other hand in each case parallel to each other. In addition, the guide elements 11, 12 are inclined relative to the guide elements 13, 14, i. arranged with divergent directions. In the example shown, the printing substrate 6 runs horizontally. But it would also be conceivable rotated by 90 ° conception for a vertical course of the web 6. This also applies in principle to the other examples and variants.

As FIG. 2 shows, the guide member 12 comprises two rectilinear parallel guide rails 15, 16 which are fixedly mounted on a wall 17 of the machine frame carrier 1. The wall 17 extends perpendicular to one of the end face 18 of the Printing cylinder 3 level laid. About each guide rail 15 and 16, which may suitably have a dovetail-shaped cross-section, each engages a sliding shoe 19, 20. The sliding blocks 19, 20 are fixedly mounted on the associated carriage 9.

To adjust the printing cylinder 3, the carriage 9 takes a in FIG. 2 at 21a indicated threaded nut into which a threaded spindle 21 engages. The threaded spindle 21 is rotatably but axially non-displaceably mounted on the machine frame carrier 1. On the threaded spindle 21, a gear 22 is mounted, which is about a countershaft, for example in the form of a belt drive 23 by a motor 24, suitably an electric servomotor, driven. The motor 24 is also firmly connected to the machine frame carrier 1. By rotation of the threaded spindle 21 of the carriage 9 along the guide member 12 forming guide rails 15, 16 is moved. The further carriages 8, 10 and 11 are guided and driven in the same way.

As FIG. 1 can be further seen, the guide elements 13, 14 are arranged for the carriage 7 and 10 of the inner printing cylinder 4 and 5 in parallel, spaced-apart planes. Slanting to the guide elements 13, 14 of the inner printing cylinder 4, 5, the guide elements 11, 12 for the carriage 8, 9 of the outer printing cylinder 2, 3. The guide elements 11, 12 extend here also in parallel, spaced-apart planes. The directional deviation between the guides 11, 14 and 12, 13 is indicated by the angle α. The taking place in the direction of the guide elements 11, 12 Abstellbewegungen the outer printing cylinder 2, 3 therefore have an upwardly or downwardly directed component, which is smaller when the angle α between the guide elements 11, 14 and 12, 13 decreases. The height of the in FIG. 1 shown printing unit with approximately horizontal passage of the printing substrate 28 can therefore be minimized become. If the tracer is used with a vertical pass of the substrate, the width of the printer can be minimized.

If the printing cylinder 2 to 5 are not to be stored on the fly, a similar machine frame carrier is to be arranged at the other end of the cylinder. Such an arrangement is in the post-published document DE 199 37 796 A1 described.

As FIG. 1 can be further seen, in the region of the ends of the guide elements 11, 12 facing away from the transfer cylinders 4, 5 arranged as an additional device depending on a Bebilderungseinrichtung 25, 26. The guide elements 11, 12 extend to the imaging devices. The imaging devices 25, 26 are firmly connected to the machine frame carrier 1 here. The guide elements 11, 12 have a double function, namely once the form cylinder 2, 3 to the transfer cylinder 4, 5 make for printing and on the other the form cylinder 2, 3 in the employment of the imaging devices 25, 26 to lead, the arrangement According to the invention, it is made such that the forme cylinders 2, 3 can be moved relative to the imaging device in their imaging direction, that is to say the working direction. As a result of the rectilinear design of the guide elements, high guide accuracy can be achieved with low production costs.

However, it would also be conceivable to accommodate the imaging devices 25, 26 on carriages movable along guide elements, so that the imaging devices 25, 26 can approach the respective associated forme cylinder and vice versa, the arrangement being such in accordance with the invention that the forme cylinder 2, 3 with regard to the imaging device 25, 26 in its imaging direction and / or the imaging device 25, 26 with respect to the associated forme cylinder 43 is movable in the direction of movement or are. Appropriately, each form cylinder and the associated imaging device the same guide elements, here 11, 12, assigned, which automatically result in the above-mentioned directions.

FIG. 1 shows the printing cylinder in the print-on position. For transfer to the print-off position or the imaging position, the forme cylinders 2, 3 are guided outward along their guide elements 11, 12. Then the transfer cylinders 4, 5 are moved up or down until all printing couple cylinders are lifted apart. At the outer end of the adjustment paths of the forme cylinders 2, 3, these then come into contact with the imaging devices 25, 26 arranged in a stationary position here.

The printing cylinder 2 to 5 can also be exchanged for printing cylinder with a smaller diameter. The further the angle α is approximated to 180 °, the easier this is possible while maintaining the existing slide or one and the same machine frame carrier. Where this is no longer possible as a result of large diameter differences, a correspondingly adapted machine frame carrier and / or correspondingly adapted carriages are used. With the same rack carrier associated with the outer cylinders carriage remain the same in any case.

The printing unit according to FIG. 3 also has four printing cylinder, namely two forme cylinder 30, 31 and two transfer cylinders 32, 33 which are rotatably mounted on each one a drive motor receiving carriage 34 to 37. The slides 34, 35 are here on V-shaped converging, straight guide elements 38, 39 slidably. For the slide 36, 37 are aligned, straight guide elements 40, 41 at a distance from the top of the V-shaped contiguous guide elements 38, 39 are provided. All guide elements are in turn provided on perpendicular to the end faces of the printing cylinder 30, 31, 36, 37 extending walls 42, 43, 44 of the machine frame carrier 45. The present arrangement offers the advantage that only three walls 42, 43, 44 have to be processed.

The guide members and the drive for adjusting the carriages 34 to 37 are formed as in the first embodiment. In the area of the outer ends of the guide elements 38, 39, a laser imaging device 46, 47 is fixedly mounted on the machine frame carrier 45. Each laser beam 48, 49 is directed parallel to the guide elements 38, 39 for the forme cylinder 30, 31 and in the direction of the axis of these cylinders. This facilitates replacement of the printing cylinder cylinders with others of other diameters, i. while maintaining the machine frame carrier 45 and the carriage 34 to 37, the printing unit can also be equipped with printing cylinders 50 to 53 of smaller diameter.

Also in this embodiment, the form cylinder 30, 31, starting from the illustrated print-on position, again be transferred by displacement of the carriage 34, 35 to the outside in the Bebilderungsposition without further adjustment movements are required. Also in this example, the imaging devices 46, 47 are stationary. But also a movable arrangement, as related to above FIG. 1 already mentioned, would be conceivable.

The four-cylinder printing unit after FIG. 4 has a machine frame carrier 60, in which in the upper region a straight, approximately parallel to the run of the horizontally guided printing substrate 77 extending here, thus also horizontally extending guide element 61 for a carriage 63 of a Form cylinder 65 is provided. In the lower region of the machine frame carrier 60, a guide element 62 for a carriage 64 of a forme cylinder 66 is arranged. Both guide elements 61, 62 are parallel. Under an angle which differs only slightly from a right angle, two guide elements 67, 68 for slides 69, 70 of the transfer cylinders 71, 72 are provided between the guide elements 61, 62, two straight guide elements 67, 68 arranged in spaced-apart parallel planes. The directions of the guide elements 61, 62 and 71, 72 are thus at an angle to each other.

In the upper region of the machine frame support 60, a imaging device 73 is also permanently installed, with which the forme cylinder 65 can be brought into contact with one end of the guide element 61 by displacement of its carriage 63. In this case, the forme cylinder 65 simultaneously lifts off from the transfer cylinder 71. On the guide member 61 is further an inking unit 74 movable, in the in the FIG. 4 shown pressure-on-position against the forme cylinder 65 can be adjusted. Similarly, in front of one end of the guide member 62 fixed to the machine frame carrier 60, a Bebilderungseinrichtung 75 and slidably disposed on the guide member 62, an inking unit 76. The imaging device 75 and the inking unit 76 cooperate with the forme cylinder 66.

For the transfer of the printing cylinder of each printing unit in the print-off position, the forme cylinder 65, 66 are first moved in the direction of the imaging devices 73, 75. At the same time, the inking units 74, 76 can be moved in the opposite direction in order to make room for the then to be moved apart transfer cylinder 71, 72. In this position, sleeves can be exchanged on the forme cylinders 65, 66, when the printing cylinder on the machine frame carrier 60 are cantilevered. Are the printing cylinder at each end to each led a machine frame carrier, so one of them, for example, fold down or start, as in the post-published document DE 199 37 796 A1 is described.

In the case of the present printing unit, the guide elements 61, 62 assume three functions, namely once the on and off of the forme cylinder 65, 66 of the transfer cylinders 71, 72, on the other hand, the leadership of the forme cylinder 65, 66 when engaging with the imaging devices 73, 75 and finally the leadership of the inking units 74, 76.

Although the imaging devices 73, 75 are fixedly arranged in the example shown, it would also be readily possible to guide these devices, as well as the inking units 74, 76, advantageously also on the guide elements 61, 62 extending up to these ancillary devices , as already indicated in another context above. Also for the directions of the respective movements in this case, the above would apply.

According to the embodiment FIG. 5 the carriages 80, 81 for the forme cylinders 82, 83 are accommodated on mutually aligned, rectilinear guide elements 84, 85 which are firmly connected to a wall 86 of the machine frame carrier 87. On an opposite wall 88 are further parallel to the guide elements 84, 85 further aligned, straight guide elements 89, 90 for carriage 91, 92 of the transfer cylinder 93, 94 attached.

Of course, it would also be conceivable to arrange on the walls 86, 88, the guides for each a forme cylinder and the not hereby cooperating transfer cylinder, such as on the Wall 86, the guides 84 and 90 and on the wall 88, the guides 85 and 89th

Above the forme cylinder 82 and below the forme cylinder 83, a respective imaging device 95, 96 are mounted. These can be firmly attached to the machine frame 87. In such a case, the forme cylinders 82, 83 are moved on the guides 84, 85 to the imaging device 95, 96, the distance being overcome solely by this movement. The guides 84,85 are designed to be correspondingly long. However, it would also be conceivable to arrange the imaging devices 95, 96 such that they can be moved to the forme cylinders 82, 83, as in FIG Fig. 5 indicated by directional arrows. For this purpose, the imaging devices can be recorded, for example, on their own slide, which can be moved on their own guides or the guides 84,85.

Regarding the directions of movement, the same applies as above. In any case, an arrangement according to the invention is such that the forme cylinder with respect to the associated imaging device in the direction of their imaging direction and the imaging device relative to the associated forme cylinder can be moved in its movement direction or are.

The arrangement according to FIG. 5 is characterized by a simple structure, since only two parallel walls of the machine frame carrier 87 are to edit.

As FIG. 5 can be seen, 87 and 100 can be used in the machine frame support 87 and printing cylinder, which has a smaller Have diameter. The carriages 80, 81 for the forme cylinders can be taken over unchanged, since the optical axis of the imaging devices 95, 96 and the axis of the respectively associated forme cylinder 82, 83 lie in one plane and the mutual relative movement runs in the direction of imaging. For the printing cylinder 98, 99, however, higher slides are used in the example shown. The machine frame carrier (s) can be maintained. However, the present structure offers the possibility that the diameters of the cylinders, and thus the format, can be varied within a wider range without having to replace the carriages for the inner cylinders.

The above discussion shows that the requirement of only one guide gives high format variability.

As required for printing additional equipment could also be a combined Farbfeuchtwerk or just a dampening unit for offset printing use.

As the above description shows, the invention is not limited to the illustrated embodiments. In particular, it is possible to provide an approximately vertical trajectory instead of an approximately horizontal trajectory. For this purpose, the guide elements are easy to provide in a rotated position by 90 °.

Claims (12)

1. A printing unit for a web-fed rotary printing machine having a plurality of printing-unit cylinders which are adjustable with respect to each other on guide elements (11 - 14; 38 - 41; 61, 62, 67, 68; 84, 85, 89, 90) and which each have their own drive motor and of which at least one is a forme cylinder (2, 3; 30, 31; 65, 66; 82, 83), characterised in that each guide element (11, 12; 38, 39; 61, 62; 84, 85;) associated with a forme cylinder (2, 3; 30, 31; 65, 66; 82, 83) extends as far as at least one additional device (25, 26; 46, 47; 73 - 76; 95, 96), such as an imaging device, a combined inking/dampening unit or a dampening unit for offset printing, that is associated with the forme cylinder and is required for printing and with which the forme cylinder (2, 3; 30, 31; 65, 66; 82, 83;) can be brought into effective engagement by means of its movement of displacement in the working direction thereof that takes place on the guide element (11, 12; 38, 39; 61, 62; 84, 85;).
2. A printing unit according to claim 1, characterised in that the additional device is a fixedly arranged imaging device (25, 26; 46, 47; 73, 75; 95, 96;) towards which the associated forme cylinder (2, 3; 30, 31; 65, 66; 82, 83) can be moved in the imaging direction thereof.
3. A printing unit according to one of the preceding claims, characterised in that an additional device is an inking and/or dampening unit (74, 76) which is mounted so that it can be moved on the same guide element (61, 62) as the associated forme cylinder (65, 66).
4. A printing unit according to one of the preceding claims, characterised in that the guide elements (12) are formed as guide rails (15, 16) that extend linearly.
5. A printing unit according to one of the preceding claims, characterised in that the guide elements (11, 12, 38, 39, 61, 62) that determine the positioning travel of the slides (8, 9, 34, 35, 63, 64) for the outer printing-unit cylinders (2, 3, 30, 31, 64, 65) and the guide elements (13, 14, 40, 41, 67, 68) that determine the positioning travel of the slides (7, 10, 36, 37, 69, 70) for the inner printing-unit cylinders (4, 5, 32, 33, 71, 72) are arranged obliquely with respect to each other.
6. A printing unit according to one of the preceding claims, characterised in that the printing-unit cylinders (2-5; 65, 66, 67, 68; 82, 83, 93, 94) are mounted in slides (7-10; 63, 64, 69, 70; 80 81, 91, 92) that can be moved on guides, with the guides (11-4; 61, 62, 67, 68; 84, 85, 89, 90) being arranged so that they lie opposite each other, parallel to each other, on at least one machine-frame carrier.
7. A printing unit according to claim 6, characterised in that two transfer cylinders (93, 94) are arranged on a wall (88), and two forme cylinders (82, 83) are arranged on a wall (86), lying opposite this wall (88), of at least one machine-frame carrier (87).
8. A printing unit according to claim 6, characterised in that the guide elements for the slides of adjacent printing-unit cylinders (82, 93, 94, 83) are provided alternately on the two walls (86, 88).
9. A printing unit according to claim 6, characterised in that the guide elements (61, 62) for the outer printing-unit cylinders (65, 66) extend substantially parallel to the web (77) of printing material guided through between the inner printing-unit cylinders (71, 72).
10. A printing unit according to claim 5, characterised in that the guide elements (11, 12, 38, 39) of the slides (8, 9, 34, 35) for the outer printing-unit cylinders (2, 3, 30, 31) are arranged in a V-shaped manner.
11. A printing unit according to claim 10, characterised in that the guide elements (40, 41) for the inner printing-unit cylinders (32, 33) are arranged one after the other in alignment.
12. A printing unit according to one of the preceding claims, characterised in that the linear guide elements (15) are provided on a wall (17) of the machine-frame carrier (1) that extends perpendicularly with respect to a plane laid against the end faces of the printing-unit cylinders (2).

Images