EP0968821B1 - Sheet transport cylinder in a sheet-fed press - Google Patents

Description

The invention relates to a sheet-fed rotary printing press with several works arranged one after the other, whereby at least one work Offset printing unit or a coating unit, which is a first, the sheet transporting cylinder and an opposing cylinder, contains another cylinder, the first and the further cylinder from each other are stored parkable. In such multi-color printing machines, which may include a Coating unit is subordinate, the paper sheets are often only in the first Printing units printed with color. Subsequent printing units or that Coating unit run "empty" if the print job in question requires it if either not the maximum number of colors for which the Machine is equipped, or if the customer does not Paint application is desired.

In this "idling" the previously freshly printed sheets are replaced by the or the subsequent works, while the blanket cylinder of the z. B. offset printing unit or the blanket cylinder of the coating unit from assigned counter-pressure cylinders are turned off, i.e. they will be at the front End gripped by gripper on the impression cylinder and adjacent to this due to the small gap between the impression cylinder and transported to the blanket or lacquer cylinder.

However, due to the high machine speeds, it happens that the sheets stand out from the respective impression cylinder and the fresh ones printed side of the sheet touches the rubber blanket or lacquer cloth, the paint smeared on it. This can already be done at relative low speeds happen when the substrate has a certain Possesses rigidity. Because heavy types of paper tend to stiff cardboard boxes as a result of the effort to take up the stretched position rather to lift off the impression cylinder and in the narrow gap of approx. 5 mm between impression cylinder and blanket cylinder on the latter be greased.

To avoid this problem, for example, in DE 43 18 777 C2 been proposed to pass the freshly printed sheet as it passes through the Hold down the pressure gap with blowing air. DE 689 632 and DE 44 43 493 generally deal with the problem of lifting rigid materials from the impression cylinder and propose mechanically to the edge of the to provide printing cones or cylindrical rollers by means of which the sheets to be printed are held down. These funds can but not easily at the critical point, namely the narrow one after switching off and removing the rubber blanket or lacquer blanket, about 5 mm wide gap between impression cylinder and blanket or Paint cylinder can be arranged.

DE 197 19 624 C1 describes a sheet-fed rotary printing press, in whose coating unit the coating blanket cylinder from the impression cylinder and can be stopped. The cylinder channel of the Lacquer blanket cylinders positioned opposite the impression cylinder and in the Cylinder channel a sheet guiding element, such as e.g. a blowpipe built into the Keep the sheet away from the blanket cylinder by blowing air. Furthermore it is known to adapt to the bending stiffness of the transported sheet in the Arch-guiding cylinders of printing presses, e.g. transfer or Deflection cylinders or transfer cylinders, areas of the bow supporting the To design cylinders radially displaceable. Such facilities are for example in US PS 5088404, DE 32 29 829 A1 and EP-A-0185965 described.

Based on this prior art, it is the task of the present Invention, a smear-free sheet run by parked printing or To enable coating units of sheet-fed rotary printing machines.

This task is performed by a sheet-fed rotary printing press with the in Features specified in claim 1 or by that in claim 12 specified procedures solved. Advantageous embodiments are in the Subclaims and based on the accompanying drawings described.

The invention is based on the finding that it is significantly simpler Avoid greasing if the gap between the first cylinder, i.e. the impression cylinder and the further cylinder assigned to it, e.g. Blanket or lacquer cylinder over the when the Cylinder predetermined size is increased. Preferably happens that by the further cylinder, i.e. the blanket or lacquer cylinder is stopped and, if necessary, after removing the blanket or lacquer cloth Segment or portion of the cylinder is shifted. Moving can happen by the sub-area or segment in question of the cylinder, i.e. is expanded or what is particularly useful is simply shifted into the inside of the cylinder. This can be done by corresponding rotation of the segment or partial area of the Cylinder happen or even by a linear movement that the segment away from the impression cylinder into the interior of the blanket or Paint cylinder shifted. This remains with the subsequent printing further blanket or lacquer cylinder e.g. by means of a coupling from Drive of the printing machine disconnected in the position in which removed or relocated segment opposite the impression cylinder. In this way, the distance between the impression cylinder and Blanket or lacquer blanket cylinders are enlarged so far that the danger lubrication considerably reduced or dependent on Printing speed and rigidity of the substrate largely avoided becomes.

It is advantageous if for this purpose the tensioning of the rubber or Lacquer cloth needed clamping devices in the channel of the cylinder in question be relocated by either removing these internals or what is particularly expedient about an axis parallel to the cylinder axis in the Cylinder interior can be pivoted. Because the latter measure can be of a suitable design can be carried out quickly and easily and if necessary also automate.

Further advantages result from the following description of Embodiments with reference to Figures 1 to 6 of the accompanying Drawings.

Figur 1 eine schematische Seitenansicht einer Druckmaschine in Reihenbauweise mit mehreren Druckwerken und einem Lackwerk,

Figur 2 eine detailliertere Seitenansicht der Werke 9 und 10 der Druckmaschine aus Figur 1 mit den für den Papiertransport bzw. zum Drucken verwendeten Zylindern,

Figur 3a einen Querschnitt durch den Lacktuchzylinder 23 des Lackwerks 10 aus Figur 2,

Figur 3b den gleichen Schnitt wie in Figur 3a jedoch bei abgestelltem Lacktuchzylinder, entferntem Lacktuch und verschwenkten Kanaleinbauten,

Figur 4 einen Querschnitt durch den Lacktuchzylinder des Lackwerks 10 aus Figur 2 gemäß einem zweiten Ausführungsbeispiel,

Figur 5 einen Querschnitt durch den Lacktuchzylinder des Lackwerks 10 aus Figur 2 gemäß einem dritten Ausführungsbeispiel, und

Figur 6 einen stark schematisierten Längsschnitt durch das Lackwerk 10 aus Figur 2 im Bereich von Lacktuch- und Gegendruckzylinder im Bereich des Druckspalts.

Show it:

FIG. 1 shows a schematic side view of a printing machine in series construction with a plurality of printing units and a coating unit,

FIG. 2 shows a more detailed side view of works 9 and 10 of the printing press from FIG. 1 with the cylinders used for paper transport or printing,

FIG. 3a shows a cross section through the coating blanket cylinder 23 of the coating unit 10 from FIG. 2,

FIG. 3b shows the same section as in FIG. 3a, but with the lacquered blanket cylinder turned off, the lacquered blanket removed and the duct fittings pivoted,

FIG. 4 shows a cross section through the blanket cylinder of the coating unit 10 from FIG. 2 according to a second exemplary embodiment,

5 shows a cross section through the blanket cylinder of the coating unit 10 from FIG. 2 according to a third exemplary embodiment, and

6 shows a highly schematic longitudinal section through the coating unit 10 from FIG. 2 in the area of the coating blanket and impression cylinder in the area of the printing nip.

In Figure 1 is a sheet-fed offset printing machine in series shown and provided with the reference number 1. It has an investor 2, with the help of the paper the paper sheets of the stack 3 in the first Printing unit 6 are transported. There and in the three following Printing units 7, 8 and 9, the supplied sheets of paper one after the other printed in four colors and then get to a coating unit 10, where a full-surface lacquer layer is applied before it does not pass through here shown drying and powder units from the boom 4 on the Delivery pile 5 are placed.

The cylinder transporting the sheet in the printing units 6 to 9 and in Coating unit 10 are interconnected by a spur gear, not shown here connected and driven by the main drive motor 42 together.

As can be seen from the somewhat detailed representation according to FIG the printing unit 9 is an offset printing unit with a plate cylinder 16 and a blanket cylinder 15, by means of which the transfer drum 11th and 12 transported and then fed the impression cylinder 17 sheets is printed with color. The inking unit, with the help of the printing plate the plate cylinder 16 is colored is not shown here. On the Impression cylinders 17 in the printing unit 9 are followed by three further transfer cylinders 13, 14 and 21, which transport the sheet further and to the impression cylinder 22 handed over in the coating unit 10. There is the bow from one to the Lacquer cloth cylinder 23 lacquer cloth stretched over the entire surface and then on transfer a gripper bridge 18 to the transport chains of the boom 4. The Paint is applied to the paint cloth stretched on the cylinder 23 by means of two rollers 24 and 25, the roller 24 the applicator roller and the roller 25 is an immersion roller running in a lacquer tub. The gap between Both rollers cause the amount of paint to be dosed.

In Figure 3a is the coating cylinder 23 of the coating unit on an enlarged scale 10 shown in section in the training in which he is to apply paint on the sheet 40 is suitable. The cylinder 23 consists of a ribbed Metal cast body, the cylindrical surface of which is designated at 28 Point is interrupted by the so-called tension channel. In the described The clamping channel has an exemplary embodiment for reasons as follows still to be explained, also about the shape of a cylinder, but with smaller diameter than the outer surface of the cylinder 23. But that must not so, it is essential that the clamping channel 28 has enough space for offers the pivoting of the internals. In this through the clamping channel 28 Formed portion of the blanket cylinder 23 are mounted on a there Carrier 33 two clamping rails 35 and 36 attached. On the tension rails 35, 36, the ends of the coating cloth 25 depend on the type of used Lacquer cloth either as shown in FIG. 3a from the terminal strips 37 and 38 gripped or in the grooves 58 and 59 of the tensioning rails 36, 37 hooked.

The carrier 33 is in the two end faces by means of corresponding axle journals of the cylinder 23 is pivotally mounted about the axis designated 34. The has the following purpose:

If the held by the gripper 39 on the impression cylinder 22, in Works 6 to 9, sheets 40 printed in four colors are not as outlined in FIG. 3a is to be painted over the entire surface, it is as follows with reference to Figure 3b explained with the coating unit 10 turned off by the gap between Impression cylinder 22 and coating cylinder 23 conveyed. Around this gap as large as possible, with the main drive 42 stopped the printing press 1 in a position in which the clamping channel 28 of the Paint cylinder 23 the channel 62 of the impression cylinder 22nd opposite (Figure 3a), the channel internals 29 together with the support 33 around the axis 34 is pivoted after the cylinder 23 has been removed from the cylinder 22 turned off and the paint cloth 26 has been removed. Then the Cylinder 23 in terms of drive via a clutch 41 from the gear train 47 Printing press 1 separately. It then remains in that shown in Figure 3b Position. This forms a on the underside of the carrier 33 for the Tension rails 35 and 36 attached arch guide 30 the bridge between two permanently installed sheet guide plates 32 and 31, which are concentric are arranged to the surface of the impression cylinder 22.

The radius of the sheet guide element 30 is dimensioned such that it is somewhat larger than the radius of the cylinder 22 and approximately concentric to it. In the position shown, rotated by approximately 180 °, the carrier 33 is through locks a device designated by 43 in FIG. 6. The locking can as well as turning the cylinder internals by hand Operating personnel e.g. through an opening 44 in the side wall 46 of the Printing machine can be made or if suitable provided Actuators are also controlled automatically from the machine. In the in Figure 3b position is between the sheet 40 on the Impression cylinder 22 and the concentric surface of the sheet guiding element 30 significantly more space than if the cylinder 23 merely as usual turned off, i.e. shifted by about 2 mm in total and the lacquer cloth would have been removed. In addition, because instead of Channel internals placed sheet guide element 30 in connection with the Baffles 31 and 32 practically a continuous smooth counter surface in Distance of a few centimeters to the arc 40 is the risk of Lubricate the freshly printed surface of sheet 40 practically excluded, even with stiffer sheets such as cardboard, which is used for Lifting off the impression cylinder 22 tends. Because the said, through which Sheet guiding plates and the sheet guiding element formed continuous surface then guides the raised rear edge of the sheet on its unprinted Edge area so that it has no possibility with the printed areas to strike somewhere.

In the described embodiment, the carrier 33 with the Duct fittings twisted or swiveled. Instead of the as described To move duct internals into the interior of the cylinder by swiveling them however, it is also possible as an alternative to the duct internals entirely remove, for example by the carrier 33 from the tensioning channel removed and replaced by an appropriately shaped sheet guiding element becomes.

Another alternative exemplary embodiment is shown in FIG. Here the cylinder internals remain in that for tensioning the lacquer cloth 126 usual position or are permanently mounted there in the clamping channel. Instead is a segment 129 of the cylinder jacket of the blanket cylinder 123 in a similar manner Like the carrier plate 33 in FIGS. 3a and b about an axis 134 pivoted, which is parallel to the axis 160 of the cylinder 123 extends and between the cylinder surface 127 and its extension and the axis of rotation 160 of the cylinder 123 is arranged. After this The pivoting of the segment 129 by 180 ° is the one that is normally on the outside convex cylindrical surface 147 of the segment inwardly into a cavity 128 of cylinder 123 and instead takes a concave Sheet guide surface 130 on the other side of the segment. This with its radius r2 is also concentric with the radius r1 Surface of the impression cylinder 122 aligned and ensures the about the difference between r1 and r2 achievable large distance between the surfaces of the impression cylinder and the blanket cylinder Passing through the sheet 140 transported without coating Coating unit. For the rest, FIG. 4 is the same for comparison with FIG. 3 Parts are provided with a reference number that is 100 higher and are attached to it Not explained again. It is clear that the individual steps up to Positioning of the cylinder 123 in the position shown in Figure 4 are the same as for positioning the cylinder 23 in FIG. 3.

In addition, segment 129 can also be relocated in other ways To create space between the sheet and the blanket cylinder, namely how for example shown in Figure 5. Here the one labeled 229 is used Segment of the cylinder surface 227 of the blanket cylinder 223 with the help of Linear guides 231a / 231b several centimeters into the interior of the Cylinders 223 are withdrawn with the aid of an actuator 250 for example in the form of a geared motor that is operated by the control panel of the Printing machine is driven on a corresponding command. The same also applies to the carrier plate 33 in the exemplary embodiment according to FIG. 3, i.e. this can also be rotated by 180 ° by motor.

In the above embodiments, the invention is related to Coating unit 10 of the printing press according to FIG. 1 has been shown. In the same However, it can also be used in one of the shutdown printing units 7, 8 or 9 the sheet printed in the printing unit 6, for example, without smudging pass through by the described for the blanket cylinder 23 Measures instead or in addition also for the blanket cylinder 15 in the relevant printing units are carried out.

LIST OF REFERENCE NUMBERS

1

Sheetfed

2

investor

3

Pile of paper in the feeder

4

boom

5

Pile of paper in the delivery

6 to 9

printing units

10

coating unit

11 to 14

Transfer drum

15

Blanket cylinder

16

plate cylinder

17

Impression cylinder

18

gripper

21

Transfer drum

22, 122, 222

Impression cylinder

23, 123, 223

Coating blanket cylinder

24

Lacquer application roller

25

Lackdosierwalze

26, 126, 226

Lacquered surface

27, 127, 227

Paint cylinder surface

28, 128

Cylindrical recess

29, 129, 229

channel internals

30, 130

sheet guide elements

31, 32

sheet guide plates

33

carrier

34, 134

swivel axis

35, 36, 135, 136

Slide rails

37, 38

collets

39, 139, 239

grab

40, 140, 240

sheet of paper

41

clutch

42

Main drive motor

43

lock

44

Hole in the side wall

45, 46

Machines sidewalls

47

spur gears

48, 49, 50, 51

Zylinderachszapfen

58, 59

groove

60, 160, 260

axis of rotation

62, 162, 262

Channel impression cylinder

147

Oberfiäche / cylinder jacket segment

231a and 231b

guides

250

actuator

Claims (15)

1. Sheet-fed rotary printing machine (1) having a plurality of units (6-10) arranged in a row, wherein at least one unit (10) comprises a first cylinder (22) transporting the sheet and a further cylinder (23) disposed opposite said first cylinder (22), said first cylinder (22) and said further cylinder (23) being mounted so as to be disengageable from one another, said further cylinder (23) being stoppable in a position,
   characterized in that
   an outer portion (29, 129, 229) of said further cylinder (23, 123, 223) in said position is opposite said first cylinder and that the further cylinder (23) includes a device by which said portion (29, 129, 229) is either displaceable into the interior of the further cylinder (23, 123, 223) or removably arranged at said cylinder.
2. Sheet-fed rotary printing machine as set forth in claim 1, wherein the at least one unit is a printing unit (9) or a varnishing unit (10).
3. Sheet-fed rotary printing machine as set forth in one of claims 1 to 2, wherein said cylinder (22, 122, 222) transporting the sheet is an impression cylinder and said further cylinder (23) is a rubber blanket cylinder or a varnishing blanket cylinder of an offset printing unit or a varnishing unit.
4. Sheet-fed rotary printing machine as set forth in one of claims 1 to 3, wherein said further cylinder (23, 123, 223) is uncouplable by a clutch (41) from the drive (42, 47) of said printing unit or said varnishing unit (10).
5. Sheet-fed rotary printing machine as set forth in one of claims 1 to 4, wherein said displaced portion (29) of said further cylinder (23) includes clamping means (35, 36) for a covering (26, 126, 226) of said cylinder (23).
6. Sheet-fed rotary printing machine as set forth in one of claims 1 to 5, wherein said displaceable portion (129, 229) of said further cylinder (123, 223) forms part of the circular outer surface (127, 227) of said cylinder (123, 223).
7. Sheet-fed rotary printing machine as set forth in claim 6, wherein said displaceable portion (29, 129) of said further cylinder (23, 123) is mounted so as to be pivotable about a second axis (34, 134) aligned parallel to an axis of rotation (60, 160) of said cylinder.
8. Sheet-fed rotary printing machine as set forth in claim 7, wherein said displaced portion (29, 129) is provided with an outwardly pivotable sheet guide element (30, 130).
9. Sheet-fed rotary printing machine as set forth in claim 8, wherein the surface of said sheet guide element (30, 130), when in an outwardly displaced position, extends concentrically to the surface of said first cylinder (22, 122).
10. Sheet-fed rotary printing machine as set forth in claim 1, wherein said portion (229) of said further cylinder (223) is displaceable linearly in a direction towards the interior of said cylinder.
11. Sheet-fed rotary printing machine as set forth in claim 5, wherein said portion (229) of said further cylinder (223) is displaceable linearly in a direction towards the interior of said cylinder.
12. Method of transporting a sheet (40, 140, 240) through a disengageable printing or varnishing unit (10) in a sheet-fed rotary printing machine (1), wherein a further cylinder disposed opposite a first cylinder (22, 122, 222) transporting the sheet (40, 140, 240) is stopped, the rubber or varnishing blanket (26, 126) is removed from the further cylinder (23, 123), the further cylinder (23, 123) is positioned in such a way that a movable outer portion (29, 129, 229) of said cylinder (23, 123, 223) is opposite said first cylinder (22, 122, 222), and the movable outer portion (29, 129, 229) of said cylinder (23, 123, 223) is removed or displaced towards the interior of the cylinder.
13. Method as set forth in claim 12, wherein the further cylinder is a rubber blanket or a varnishing blanket cylinder (15, 27) of an offset printing unit (9) or a varnishing unit (10) having blanket clamping means (35, 36), and wherein said blanket clamping means are removed or displaced or retracted into the interior of the further cylinder.
14. Method as set forth in claim 12, wherein a segment (129) of the convex outer surface (127) of the further cylinder is removed or displaced inwardly.
15. Method as set forth in claim 12, wherein the movable outer portion (29, 129) is pivoted about an axis (34, 134) parallel to the axis of rotation (60, 160) of the further cylinder (23, 123).

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