EP1454745B1 - Printing unit of a printing machine - Google Patents

Abstract

The cylinder (2,3) has at least two ducts (12,13,14) one behind each other in a peripheral direction and taking second casings (9,11) on the cylinder. At least one of the ducts is at least partly covered by a second casing. The cylinder is a form or transfer cylinder with the second casing in the form of a printing plate,.

Description

The invention relates to a printing unit of a rotary printing press according to the preamble of claim 1.

From the DE 44 29 210 A1 the arrangement of four in the direction of rotation of a forme cylinder successively arranged printing foils is known, which are held in four pits. The printing foils each span a circular arc section lying between two pits.

The DE 44 29 891 A1 shows a printing unit of a rotary printing machine with double-sized transfer cylinder (ie, two section lengths around the circumference), which cooperates with a simple large form cylinder.

Also is through the DE 198 03 809 A1 an arrangement of cylinders of an offset printing unit is known in which the circumference of the transfer cylinder to that of the forme cylinder is in a double ratio. The form cylinder is in the circumferential direction with a printing form and in its longitudinal direction with at least four standing printed pages in the broadsheet format, or equivalent number of standing or lying tabloid or book formats, assignable. In the circumferential direction of the transfer cylinder for receiving two in the longitudinal direction of the cylinder juxtaposed blankets a single, either longitudinally continuous or longitudinally divided and offset by 180 °, slot arranged. The blanket is, for example, two-ply designed as a fixed to a support plate rubber blanket.

In the DE 34 41 175 C2 be for the purpose of relaxing the blanket Recesses proposed in the cylinder surface of the transfer cylinder. Between cylinder and blanket can also be arranged for this purpose a pad that does not have the entire length of the blanket in the circumferential direction and has an interruption. To accommodate the interrupted pad a slot is provided on the circumference of the cylinder next to the clamping channel for the blanket. The arranged in the longitudinal direction of the transfer cylinder recesses and the rubber blanket receiving channel are arranged so that they act together in the contact region with the channel of the plate cylinder.

The DE 197 40 475 A1 shows cooperating forming and transfer cylinder, wherein in one embodiment, the transfer cylinder in the circumferential direction one behind the other two clamping channels and two held in the clamping channels rubber blankets. In another example, a double-sized transfer cylinder interacts with a double-sized forme cylinder, but both cylinders have only one chucking channel in the circumferential direction. In all examples, the channels do not roll off each other.

By the DE-OS 19 60 635 a single form cylinder is disclosed, which has on its circumference in the circumferential direction a plurality of channels for the attachment of printing plates. When occupying the forme cylinder with a printing forme in the circumferential direction, at least one of the channels can be covered.

The DE 2 528 008 A discloses a six newspaper page wide cylinder pair of form cylinder and impression cylinder of a direct printing process. The printing plates and press felts are held in slots of the cylinders. The form cylinder has sections of pairs of two offset by 180 ° to each other slots, wherein adjacent pairs are offset from each other in the circumferential direction. The impression cylinder has juxtaposed three elevators, which are offset from each other in the circumferential direction. Such a thing Angled arrangement of slots is also important for transfer and form cylinders of an offset printing unit.

In the GB 2092069 A It is about the problem of being able to assign possibly occurring printing errors to a specific printing unit for its correction in a product composed of several printing machine lines. This is achieved by means of a kind of indexed stamp, which is arranged in the channel of the forme cylinder and whose printed image is printed on the transfer line via the transfer cylinder.

The DE 27 01 670 A1 deals with the wear of rolling over the channels of two adjacent cylinders by vibrational excitement striking Schmitzringe. The form and transfer cylinders shown there each have only one channel in the circumferential direction.

The invention has for its object to provide a printing unit of a rotary printing press.

The object is achieved by the features of claim 1.

It is particularly advantageous that both different formats of the lifts, in the circumferential and longitudinal direction of the cylinder, as well as different constellations and phase shifts of the mutually interacting cylinders considered, and thereby in terms of z.T. competing requirements for register retention, low vibration, arrangement of the rolling pressure areas and minimizing the non-printable paper can be optimized as needed.

The arrangement of a single longitudinally and circumferentially extending elevator brings advantages in terms of variety in the printable formats (height and width of the print area such as Panorama).

The embodiment of the elevators for the transfer cylinder as a multi-layer or multi-layer printing blanket, which has a carrier plate and a support or layer connected thereto, is advantageous with regard to the quality of the development of the printed image. Especially with large dimensions, a dimensionally stable design is essential for a print quality that is consistently good and register-accurate over the circumference of the cylinder.

Also advantageous is the formation of the channels with a narrow opening to the outer surface of the cylinder, z. B. to reduce paper consumption. For channels of the forme cylinder, a narrow opening is particularly advantageous, in particular for Channels which are at least partially covered. For example, this can further reduce the risk of breakage.

Furthermore, it is advantageous to perform the circumferential ratio of the transmission to the forme cylinder integral and to arrange the channels on the cylinder in the circumferential direction symmetrically.

Embodiments of the invention will be described in more detail below.

Fig. 1

ein nicht beanspruchtes doppelt breites Zylinderpaar, wobei der Formzylinder mit zwei in Längsrichtung verlaufenden Kanälen ausgebildet ist und sich die Aufzüge auf dem Formzylinder nahezu über den vollen Umfang erstrecken;

Fig. 2

ein nicht beanspruchtes doppelt breites Zylinderpaar, wobei der Form- und Übertragungszylinder mit jeweils zwei in Längsrichtung verlaufenden Kanälen ausgebildet ist und sich die Aufzüge auf dem Form- und Übertragungszylinder nahezu über den vollen Umfang erstrecken;

Fig. 3

ein mehrschichtiges Drucktuch mit Kanal und Halteeinrichtung.

Show it:

Fig. 1

an unclaimed double-wide pair of cylinders, wherein the form cylinder is formed with two longitudinally extending channels and the elevators extend on the forme cylinder almost over the full circumference;

Fig. 2

an unclaimed double-wide pair of cylinders, wherein the forming and transfer cylinder is formed with two longitudinally extending channels and the elevators extend on the forming and transfer cylinder almost over the full circumference;

Fig. 3

a multi-layered blanket with channel and holding device.

A printing unit of a rotary printing machine has at least one pair of cylinders 01 consisting of two cylinders 02; 03, for example, a transfer cylinder 02 and cooperating with this form cylinder 03. The transfer cylinder 02 can act on the printing substrate to be printed with a counter-pressure cylinder, not shown, or with a transfer cylinder of a second cylinder pair, which in turn is associated with a forme cylinder. The transfer cylinder 02 is connected to an elevator 09, for example a blanket 09, and the forme cylinder 03 with at least one elevator 11, for example a printing plate 11, assignable.

Depending on the requirements of the print formats and the printing performance, as well as the possibilities in the paper guide, the pair of cylinders 01 is made differently wide. For example, the cylinder pair 01 for newspaper printing is made three times wide (six newspaper pages in the longitudinal direction of the cylinder), simply wide the width of the bale, such as the forme cylinder 03, for two standing or lying newspaper pages. In commercial printing, double-width refers to the required width for four horizontal or six vertical A4 pages. The scopes of the transfer 02 and the forme cylinder 03 are each made simple or double, based on a variety of standing or lying formats, such as a standing or lying newspaper format. Advantageous constellations in newspaper printing are for example a doubly large scale, d. H. two sides in the circumferential direction, the transfer cylinder 02 cooperating with a double or simple circumference of the forme cylinder 03, each double wide.

Fig. 1 shows an unclaimed double-wide pair of cylinders 01, wherein transfer cylinder 02 and forme cylinder 03 each have a double circumference. The forme cylinder 03 has two longitudinally extending and circumferentially spaced channels 12; 13 for receiving the ends of at least one printing plate 11, the transfer cylinder 02 a channel 14 for receiving the ends of at least one blanket 09 on. The channels 12; 13 of the forme cylinder 03 are at least on a section in the longitudinal direction of the forme cylinder 03, viewed in a direction perpendicular to the axis of rotation cross section, arranged in the circumferential direction one behind the other. The forme cylinder 03 is occupied in the unclaimed example with four longitudinally of the cylinder juxtaposed printing plates 11, for example printing plates 11, which are each held with its two ends in the channel 12, except for the area of the channel 12 each around the entire circumference extend and each cover the channel 13. The claimed form cylinder 03 is made three times wide. He can be flexible in many ways, eg. B. with a continuous, or two or more longitudinally juxtaposed printing plates 11 different formats (eg., Simple, Panorama) be occupied. If necessary, the forme cylinder 03 may also have more than two longitudinally extending and circumferentially spaced channels 12; 13 have. The transfer cylinder 02 in Fig. 1 has a continuous channel 14.

The transfer cylinder 02 can also, as exemplified in Fig. 2 shown a second, z. B. diametrically opposite and extending in the longitudinal direction of the transfer cylinder 02 channel 16. In the claimed example covers a single, up to the region of the channel 14 over the entire length of the bale and almost over the entire circumference extending blanket 09 the transfer cylinder 02. The forme cylinder is here in unclaimed design with two in the longitudinal direction of the cylinder adjacent , and each occupied by almost the full circumference extending printing plates 11.

Unlike in Fig. 1 and 2 with the forme cylinder 03 acting together unclaimed double-width embodiment of the transfer cylinder 02 this invention is carried out three times wide. The with the two channels 12, 13 having forme cylinder 03 cooperating transfer cylinder 02 from the first two embodiments ( Fig. 1, 2 ) is occupied by a continuous blanket 09.

Two cylinder pairs 01 can form a printing unit, with the two transfer cylinders 02 acting together via the printing material. The cylinder pairs 01 are performed according to the invention three times or even four times wide. The teaching of the figures is then applied accordingly.

The forme cylinder 03 is made twice as large, it is with two channels 12; Executed 13, and occupied with several longitudinally side by side and simultaneously with a plurality of circumferentially successively arranged printing plates 11.

For the forme cylinder 03 each symmetrical in the circumferential direction arrangement of the channels 12; 13 with almost identical intermediate angles advantageous, z. B. at two channels 12; 13 offset by 180 °, with three by 120 °.

The ratio of the circumference of the transfer cylinder 02 to that of the forme cylinder 03 is advantageously integer, in particular in the case of a forme cylinder 03 with circumferentially successively arranged channels 12; 13 at twice the size equals 1.

The forme cylinders 03 can be occupied one behind the other in the usual manner, that is to say with a plurality of elevators 11, predetermined by the number of channels, in the circumferential direction.

In the Figures 1 and 2 are the channels 12; 13, 14, 16 in each case to the front side of the cylinder 02; 03 shown running. For reasons of stability, for reasons of pollution or when using Schmitzringen but the front side is an unillustrated edge without channel 12; 13; 14; 16 ago. The channels 12; 13; 14; 16 extend in this case almost over the entire length of the cylinder 02; 03 or its bale.

The mentioned embodiments and examples for the arrangement of channels 12; 13; 14; 16 and elevators 09; 11 on transfer cylinders 02 and forme cylinders 03 and configurations of printing couples with a pair of cylinders 01 from a transfer cylinder 02 and a cooperating forme cylinder 03 are to apply both for the case when the pair of cylinders 01 with a second transfer cylinder, as well as running with a steel cylinder, for example Counterpressure cylinder acts together.

Under elevator 11 is here z. B. understood a one-piece pressure plate 11. The elevator 09 for the transfer cylinder 02 represents a one-piece blanket 09. This one-piece blanket 09 may be single-layered or multi-layered, for the latter on a support plate 21, for example, at least one layer 22 applied and firmly connected thereto. The ends 23; 24 of the single or multi-layer blanket 09 act with a channel 14; 16 arranged holding device 26 together.

In particular in connection with narrow openings of the channels 14; 16 to the lateral surface of the transfer cylinder 02 toward the formation of the blanket 09 is advantageous as a multi-layer blanket 09, which does not or only insignificantly changes when rolling example, the cylinder 03 on the transfer cylinder 02 by walking its length or width, ie almost dimensionally stable. For this purpose, the blanket unit 09, as in Fig. 3 shown, the almost dimensionally stable support plate 21, for example of metal or plastic, on which the elastic or soft layer 22 is applied (indicated in FIG Fig. 1 and 2 ). In the present example of the multi-layer printing blanket 09, the ends 23 and 24 of the blanket 09 are identical to the ends of the support plate 21, since the support plate 21 in with the channel 14; 16 cooperating area is bent and uncoated.

The support plate 21 of the multi-layer printing blanket 09 may be coated in another embodiment also up to the ends of the support plate 21, in which case the ends 23 and 24 of the multilayer blanket 09 next to the support plate 21 and the layer 21 have. If the blanket is designed as a simple rubber blanket 09, the ends 23 act; 24 of the blanket 09 with the channels 14; 16 together.

Also the channels 12; 13 may in an advantageous embodiment holding means 33 for the Have printing plates 11.

The holding device 26; 33 may be a known device for non-positive or positive holding and / or clamping a lift 09; Be 11, such. As non-positive or positive mechanisms, spring force or gear driven terminal strips or shafts, or tangential driver.

An advantageous embodiment of a holding device 26; 33 for a lift 09; 11, in particular for a multi-layer printing blanket 09 or a printing plate 11, is the example of a multi-layer printing blanket 09 in Fig. 3 shown representative of the channel 14 in the transfer cylinder 02. The arrangement of such or similar holding means 33 for the printing plates 11 in the channels 12; 13 is an example in Fig. 2 indicated.

The holding device 26 is arranged in the axially extending channel 14 of the transfer cylinder 02 for holding the blanket 09. The operation of the device for clamping or holding the multi-part blanket 09 via a rotatably mounted in the channel 14 of the transfer cylinder 02 shaft 27, for example, a spindle 27 with pressure pieces 28th

The parallel to the axis of the transfer cylinder 02 extending to the tangent of the lateral surface by 30 to 60 °, in particular by about 45 °, inclined channel 14 has a gap 29 on the lateral surface of the transfer cylinder 02 and a lying inside the transfer cylinder 02, with the Gap 29 connected, bore 31. The width b29 of the gap 29 in the region of the lateral surface in the circumferential direction of the transfer cylinder 02; 03 is greater than twice the thickness of one of the ends 23; 24 of the blanket 09, which in the present example is equivalent to twice the thickness of the support plate 21. For the width b29 of the gap 29 is advantageously 1 mm ≤ b29 ≤ 5 mm, in particular b29 ≤ 3 mm. In the case of a simple one Blanket 09, the width b29 is insignificantly greater than twice the thickness of the blanket 09, in the case of the coated to the ends of the support plate 21 multilayer blanket 09, the width b29 is insignificantly greater than twice the thickness of the coated end 23; 24 of the multi-layer blanket 09 to choose.

In the bore 31, the shaft 27, in the example, a pivotable spindle 27, arranged in which the pressure pieces 28, z. B. stamp, balls or similar, are arranged directed resiliently and radially outward.

For clamping the blanket 09 both ends 23; 24 of the blanket 09, in the example equivalent to the ends of the support plate 21, guided in the gap 29 and the spindle 27 with the pressure pieces 28 so pivoted that these almost perpendicular to the leading and trailing end 23 and 24 of the blanket 09 and the support plate 21 and a cylinder-fixed wall 32 presses and holds this non-positively in the gap 29. If a plurality of printing blankets 09 are arranged one behind the other in the circumferential direction of the transfer cylinder 02, a forward and a trailing end 23 and 24 of adjacent printing blankets 09 act together in each case. The holding device 26 may additionally comprise a slide, not shown, which in addition to the ends 23 and 24 in the gap 29 can be inserted and the gap 29 terminates to the outside. Advantageously, this slide is connected to the spindle 27, so that it is moved in pivoting of the spindle 27 in or out of the gap 29. The width b29 of the gap 29 is formed correspondingly larger when using such a slider.

The channels 12; 13 of the forme cylinder 03 are in a preferred embodiment as for the channel 14; 16 also as to the tangent of the lateral surface by 30 to 60 °, in particular by about 45 °, inclined narrow slots 12; 13, which has a width b12 (FIG. Fig. 1, 2 ) in the region of the lateral surface in the circumferential direction, which is greater than twice the thickness of the printing plate 11. For the width b12 of the slot 12, advantageously 1 mm ≦ b12 ≦ 5 mm, in particular b12 ≦ 3 mm. For an exemplary schematic representation of Holding device 33 for the printing form 11 is shown in the multi-part blanket 09 Fig. 3 only the multi-part blanket 09 (from support plate 21 and layer 22) by a printing plate 11 with bent, in the channel 12; To replace 13 reaching ends. The reference number for the width b29 would correspond to the width b12 and the reference numeral for the transfer cylinder 02 of the forme cylinder, z. B. 03. The ends 23; 24 correspond to the bent ends of the printing forme 11.

On a holding device 33 in the channels 12; 13 of the forme cylinder 03 can be omitted if by means of shaping the ends of the printing plate 11 and / or the channels 12; 13 a secure holding is guaranteed.

LIST OF REFERENCE NUMBERS

01

Cylinder pair, first

02

Cylinder, transfer cylinder (01)

03

Cylinder, forme cylinder (01)

04

-

05

-

06

-

07

-

08

-

09

Elevator, blanket, blanket

10

-

11

Elevator, printing form, printing plate

12

Channel; Slot (03)

13

Channel; Slot (03)

14

Channel (02)

15

-

16

Channel (02)

17

-

18

-

19

-

20

-

21

Carrier plate (09)

22

Layer (09)

23

End (09)

24

End (09)

25

-

26

holder

27

Shaft, spindle

28

Pressure piece

29

gap

30

-

31

Bore (02; 03)

32

Wall (02; 03)

33

holder

b12

Width (12; 13)

b29

Width (29)

Claims (17)

1. A printing couple of a rotary printing press with a transfer cylinder (02) with a channel (14; 16) for receiving ends of at least one packing (09), a forme cylinder (03) arranged so as to co-operate with the first transfer cylinder (02) as a pair of cylinders (01) and a counter-impression cylinder co-operating with the transfer cylinder (02), wherein the barrel of the transfer cylinder (02) and the forme cylinder (03) has a width which corresponds to approximately six vertical or horizontal newspaper pages, and the forme cylinder (03) co-operating with the transfer cylinder (02) has two channels (12; 13) offset by 180° with respect to each other in the peripheral direction, characterized in that the two channels (12; 13) of the forme cylinder (03) which are offset by 180° with respect to each other in the peripheral direction extend in each case substantially over the entire length of the barrel of the forme cylinder (03) as far as an edge on the end face, as viewed in the longitudinal direction of the transfer cylinder (02) only a single packing (09) is provided, which extends substantially over the entire periphery as far as the region of the channel (14) as viewed in the peripheral direction, and bearer rings are provided on the cylinders (02; 03).
2. A printing couple according to Claim 1, characterized in that in the region of the external face the channel (14; 16) of the transfer cylinder (02) has a gap (29) with a width (b29) of from 1 to 5 mm in the peripheral direction in order to receive the packing (09).
3. A printing couple according to Claim 1, characterized in that the forme cylinder (03) and the transfer cylinder (02) have the same perimeter.
4. A printing couple according to Claim 1, characterized in that the barrel of the transfer cylinder (02) has a perimeter which corresponds to at least two horizontal or vertical newspaper pages.
5. A printing couple according to Claim 1, characterized in that in the region of the external surface the channel (14; 16) of the transfer cylinder (02) has a gap (29) with a width (b29) in the peripheral direction which is greater than twice the thickness of one of the ends (23; 24) of the printing blanket (09) and smaller than or equal to 3 mm.
6. A printing couple according to Claim 1, characterized in that the packing (09) is constructed in the form of a rubber blanket (09).
7. A printing couple according to Claim 1, characterized in that the ratio of the perimeter of the transfer cylinder (02) to the forme cylinder (03) is a whole number.
8. A printing couple according to Claim 1, characterized in that the printing formes (11) are arranged with their ends in a channel (12; 13) or at least in alignment along the forme cylinder (03).
9. A printing couple according to Claim 1, characterized in that the forme cylinder (03) comprises a plurality of printing formes (11) arranged one behind the other in the peripheral direction.
10. A printing couple according to Claim 1, characterized in that the barrel of the forme cylinder (03) has a perimeter which corresponds to at least two horizontal or vertical newspaper pages.
11. A printing couple according to Claim 1, characterized in that in the region of the external face the channel (12; 13) of the forme cylinder (03) has a width (b12) in the peripheral direction which is greater than twice the thickness of the printing forme (11) and is in the region of between 1 mm and 5 mm, and in particular less than or equal to 3 mm.
12. A printing couple according to Claim 1, characterized in that the channel (12; 13; 14; 16) has at least one holding device (26; 33).
13. A printing couple according to Claim 1, characterized in that the packing (09) is constructed in a plurality of layers, comprising a support plate (21) and a layer (22) joined to the support plate (21).
14. A printing couple according to Claim 1, characterized in that the channel (14) of the transfer cylinder (02) is inclined by from 30° to 60° with respect to the tangent of the external face.
15. A printing couple according to Claim 1, characterized in that the channel (12; 13) of the forme cylinder (03) is inclined by from 30° to 60° with respect to the tangent of the external face.
16. A printing couple according to Claim 14 or 15, characterized in that the inclination amounts to approximately 45°.
17. A printing couple according to Claim 1, characterized in that the counter-impression cylinder is constructed in the form of a transfer cylinder (02) of a second pair of cylinders.

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