EP1334826B1 - 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 forme 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 GB 1 476 707 A shows a printing unit of a rotary printing machine with a - transfer cylinder with a channel for receiving one or more blankets, cooperating with the transfer cylinder as a pair of cylinders form cylinder, the transfer cylinder in the longitudinal direction channels, in which in the axial direction side by side three blankets are held, and with the transfer cylinder cooperating form cylinder in the circumferential direction two order Having 180 ° offset from one another channels.

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 plurality of juxtaposed in the longitudinal direction of the cylinder, in each case almost over the entire circumference extending elevators has z. B. advantages in terms of handling and individual interchangeability. This is especially true for long cylinders, as is the case for triple (eg six newspaper pages) wide cylinders.

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 a small opening is particularly advantageous for the forme cylinder, in particular for channels which are covered at least in part. 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.

Show it:

Fig. 1

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

Fig. 2

two unstressed, double-wide pairs of cylinders, the transfer cylinder being formed with two longitudinal channels and occupied by two longitudinally adjacent elevators extending almost fully circumferentially;

Fig. 3

two unstressed, double-wide pairs of cylinders, wherein the transfer cylinder with two longitudinally extending channels and four elevators, each arranged in the circumferential direction successively arranged elevators in the longitudinal direction next to each other;

Fig. 4

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 acts on the printing substrate 04 to be printed together with a counter-pressure cylinder, not shown. The transfer cylinder 02; 07 is with at least one elevator 09, for example a blanket 09, and the forme cylinder 03; 08 each 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 cylinder pairs 01; 06 different widths executed. For example, the cylinder pairs 01; 06 for newspaper printing three times wide, with simply wide the width of the bale, for example, the forme cylinder 03, for two standing or lying newspaper pages referred. In commercial printing, double-width refers to the required width for four horizontal or six vertical A4 pages. The sizes of transmission 02; 07 and the forme cylinder 03; 08 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; 07 acting together with a double or simple circumference of the forme cylinder 03; 08, each double width.

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, 08 are at least on a partial section in the longitudinal direction of the forme cylinder 03; 08, in one Viewed perpendicular to the axis of rotation cross section, arranged in the circumferential direction one behind the other. The unclaimed forme cylinder 03 is occupied in the example with four in the longitudinal direction of the cylinder juxtaposed printing plates 11, for example, pressure plates 11, which are each held with its two ends in the channel 12, extend to the region of the channel 12 respectively around the entire circumference and each cover the channel 13. The claimed form cylinder 03 can be 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. In the embodiment with two blankets 09 not claimed transfer cylinder 02 in Fig. 1 has a continuous channel 14, in which in the axial direction next to each other two blankets 09 are held.

Unlike in Fig. 1 with the forme cylinder 03; 08 cooperatively illustrated double-wide embodiment of the transfer cylinder 02, this can be performed, for example, three times wide. The with the two channels 12, 13 having the form of cylinders 03; 08 cooperating transfer cylinder 02; 07 from the first example ( Fig. 1 ) is occupied with a plurality of longitudinally juxtaposed printing blankets 09, or with several longitudinally side by side and simultaneously with a plurality of circumferentially successively arranged printing blankets 09. In the Figures 2 and 3 can in this case z. As well as a forme cylinder 03 double the circumference Fig. 1 and its description in place of in the Figures 2 and 3 illustrated form cylinder 03; 08 kick.

In the following embodiments, Figures 2 and 3 and related description, are arrangements for the arrangement of blankets 09 on a transfer cylinder 02; 07 set forth, wherein the transfer cylinder 02; 07 several in Longitudinally extending channels 14; 16 has. Although the examples show two each a printing unit forming, double-width cylinder pairs 01; 06, wherein the two transfer cylinders 02; 07 on the substrate 04 together. The cylinder pairs 01; However, if necessary, they may be triple or even four times wide. The teaching from the examples should then be applied accordingly. For the claimed printing unit can in the following embodiments of the cooperating form cylinder 03; 08 z. B. be made twice as large, it has two channels 12; 13 on, and is z. B. with two in the axial direction next to each other or in the circumferential direction successively arranged printing plates 11, or with a plurality of longitudinally adjacent to each other and simultaneously occupied with a plurality of circumferentially successively arranged printing plates. Also in Fig. 1 illustrated embodiment for the with the transfer cylinders 02; 07 of the Figures 2 and 3 co-operating form cylinder 03; 08 are to be applied.

Fig. 2 shows the unclaimed arrangement of two blankets 09 on a transfer cylinder 02; 07, which are arranged side by side in the longitudinal direction and each extending approximately over the full circumference. Two channels 14; 16 extend in the longitudinal direction of the transfer cylinder 02; 07 and are arranged offset in the circumferential direction almost 180 °. The channel 16 is covered and, in particular in the case of non-dimensionally stable printing blankets 09, counteract the walking and relax the elevator as a relief unit. In an advantageous manner, the channel 14 or the covered channel 16 acts upon settlement of the cylinder against each other with the channel 12 of the forme cylinder 03; 08 together. The arrangement of three or more printing blankets 09 arranged side by side, in particular in the case of very long cylinders, takes place in an analogous manner in an aligned or alternating manner.

Fig. 3 shows the unclaimed arrangement of four blankets 09 on a, z. B. double-wide and double-sized, transfer cylinder 02; 07. In each case two in the circumferential direction successively arranged printing blankets 09 are in the longitudinal direction arranged side by side. In an analogous manner, in particular for longer and stronger cylinders, more than two blankets in each case in the longitudinal or in the circumferential direction to be arranged. The latter, however, sets a corresponding number of channels 14; 16 ahead.

Both for the transfer cylinder 02; 07 as well as for the forme cylinder 03; 08 is in each case the circumferentially symmetrical arrangement of the channels 12; 13 and 14, respectively; 16 with almost identical intermediate angles advantageous, z. B. at two channels 12; 13 and 14, respectively; 16 offset by 180 °, with three by 120 ° or alternately by 180 °. With more than two channels 12 each; 13 and 14, respectively; 16, a plurality of longitudinally juxtaposed printing plates 11 or blankets 09 may be offset from each other in the circumferential direction.

The ratio of the circumference of the transfer cylinder 02; 07 to the forme cylinder 03; 08 is advantageous integer, in particular for the case of a forme cylinder 03; 08 with circumferentially arranged in succession channels 12; 13 at twice the size equals 1.

In the Fig. 2 and 3 shown two cylinder pairs 01 and 06 need not be equipped in the same way with the same channel number and geometry, or with the same pattern for the elevators 09; 11 be occupied. However, it is advantageous to tune the phases of non-printing areas of the co-operating transfer cylinder 02; 07 so that non-printing areas, in particular areas of hidden or not covered channels cooperate.

The in the FIGS. 1 to 3 and the descriptions associated with assignments of the transfer cylinders 02; 07 with blankets 09 are also applicable to the other embodiments accordingly. The same applies to the assignment of the forme cylinder 03; 08 and the transfer to the other embodiments in the Connection with different versions of the transfer cylinder 02; 07th

In the FIGS. 1 to 3 are the channels 12; 13, 14, 16; 17; 18 respectively to the front side of the cylinder 02; 04, 07; 08 shown running. However, for reasons of stability, for reasons of pollution or when using bearer rings, however, an edge without a channel 12 can be provided on the front side; 13; 14; 16; 17; 18 present. The channels 12; 13; 14; 16; 17; 18 extend in this case almost over the entire length of the cylinder 02; 03, 07; 08 or its bale.

The examples of the arrangement of channels 12; 13; 14; 16; 17; 18 and elevators 09; 11 on transfer cylinder 02; 07 and forme cylinders 03; 08 as well as configurations of printing units with a pair of cylinders 01; 06 from a transfer cylinder 02; 07 and a co-operating form cylinder 03; 08 apply to the case according to the invention, when the cylinder pair 01; 06 not with a in Fig. 2 and 3 shown second transfer cylinder 07, but with a counter-pressure cylinder, for example, designed as a steel cylinder cooperates.

Under elevator 11 is here z. B. understood a one-piece pressure plate 11. The elevator 09 for the transfer cylinder 02; 07 represents a one-piece printing blanket 09. This one-piece printing blanket 09 has a multi-layered construction, wherein for the latter on a carrier plate 21, for example, at least one layer 22 is applied and fixedly connected thereto. The ends 23; 24 of the single or multi-layer blanket 09 act with a channel 14; 16; 17; 18 arranged holding device 26 together.

In particular in connection with narrow openings of the channels 14; 16; 17; 18 to the lateral surface of the transfer cylinder 02; 07 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 forme cylinder 03 on the transfer cylinder 02 by walking its length or width, that is almost dimensionally stable. For this purpose, the Blanket unit 09, as in Fig. 4 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; 17; 18 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; 17; 18 together.

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

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. 4 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 and 3 indicated.

The holding device 26 is in the axially extending channel 14 of the transfer cylinder 02nd arranged to hold 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 circumferential surface in the circumferential direction of the transfer cylinder (02, 03, 07, 08) 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 blanket 09, the width b29 is insubstantially greater than twice the thickness of the blanket 09, in the case of the multi-layer blanket 09 coated to the ends of the carrier plate 21, 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 this 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. Are in the circumferential direction of the transfer cylinder 02 a plurality of blankets 09th arranged one behind the other, so act respectively one leading and one trailing end 23 and 24 adjacent blankets 09 together. 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; 08 are in a preferred embodiment as for the channel 14; 16; 17; 18 also as to the tangent of the lateral surface by 30 to 60 °, in particular by approximately 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 the holding device 33 for the printing plate 11 is shown in the multi-part blanket 09 Fig. 4 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; 08 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

substrate

05

-

06

Cylinder pair, second

07

Cylinder, transfer cylinder (06)

08

Cylinder, forme cylinder (06)

09

Elevator, blanket, blanket

10

-

11

Elevator, printing form, printing plate

12

Channel; Slot (03; 08)

13

Channel; Slot (03; 08)

14

Channel (02; 07)

15

-

16

Channel (02; 07)

17

Channel (02; 07)

18

Channel (02; 07)

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; 07; 08)

32

Wall (02; 03; 07; 08)

33

holder

b12

Width (12; 13)

b19

Width (19)

Claims (24)

1. Printing unit of a rotary printing press comprising a transfer cylinder (02; 07) having a channel (14; 16; 17; 18) for holding one or more blankets (09), a forme cylinder (03; 08) arranged so as to coperate with the transfer cylinder (02; 07) as a cylinder pair (01; 06), and a counter pressure cylinder cooperating with the transfer cylinder (02; 07) and differing from a second transfer cylinder, the transfer cylinder (02; 07) having a channel (14) and, side by side in the axial direction, three blankets (09) and the forme cylinder (03; 08) cooperating with the transfer cylinder (02; 07) having two channels (12; 13) offset by 180° relative to one another in the circumferential direction, characterized in that the channel (14) of the transfer cylinder (02; 07) is formed so as to be continuous in the longitudinal direction, in that the three blankets (09) are held flush in the continuous channel (14) of the transfer cylinder (02; 07), in that the channel (14; 16; 17; 18) of the transfer cylinder (02; 07) has, in the region of the lateral surface, a gap (29) having a width (b29) of 1 to 5 mm in the circumferential direction, and in that the two channels (12; 13) of the forme cylinder (03; 08) which are offset by 180° in the circumferential direction extend in each case virtually over the total length of the body of the forme cylinder (03; 08) up to the end face or except for an end edge.
2. Printing unit according to Claim 1, characterized in that bearer rings are provided on the cylinders (02; 03; 07; 08).
3. Printing unit according to Claim 1, characterized in that forme cylinders (03; 08) and transfer cylinders (02; 07) have the same circumference.
4. Printing unit according to Claim 1, characterized in that the body of the transfer cylinder (02; 07) has a circumference which corresponds at least to two horizontal or vertical newspaper pages.
5. Printing unit according to Claim 1, characterized in that the body of the transfer cylinder (02; 07) has a width which corresponds approximately to six horizontal or vertical newspaper pages.
6. Printing unit according to claim 1, characterized in that the channel (14; 16; 17; 18) of the transfer cylinder (02; 07) has, in the region of the lateral surface, a gap (29) which has a width (b29) in the circumferential direction which is greater than twice the thickness of one of the ends (23; 24) of the blanket (09) and less than or equal to 3 mm.
7. Printing unit according to Claim 1, characterized in that the blanket (09) is in the form of a rubber blanket (09).
8. Printing unit according to Claim 1, characterized in that the ratio of the circumference of transfer cylinder (02; 07) to forme cylinder (03; 08) is integral.
9. Printing unit according to Claim 1, characterized in that the channels (12; 13; 14; 16; 17; 18) are arranged with equal spacings in the circumferential direction.
10. Printing unit 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; 08).
11. Printing unit according to Claim 1, characterized in that the forme cylinder (03; 08) has a plurality of printing formes (11) arranged one behind the other in the circumferential direction.
12. Printing unit according to Claim 1, characterized in that the body of the forme cylinder (03; 08) has a circumference which corresponds at least to two horizontal or vertical newspaper pages.
13. Printing unit according to Claim 1, characterized in that the body of the forme cylinder (03; 08) has a width which corresponds approximately to six horizontal or vertical newspaper pages.
14. Printing unit according to Claim 1, characterized in that the channel (12; 13) of the forme cylinder (03; 08) has, in the region of the lateral surface, a width (b12) in the circumferential direction which is greater than twice the thickness of the printing forme (11) and in the range between 1 mm and 5 mm, in particular less than or equal to 3 mm.
15. Printing unit according to Claim 1, characterized in that the ratio of the circumference of transfer cylinder (02; 07) to forme cylinder (03; 08) is integral.
16. Printing unit according to Claim 1, characterized in that the transfer cylinder (02; 07) has, in the circumferential direction, two channels (14; 16; 17; 18) arranged one behind the other.
17. Printing unit according to either of Claims 1 or 16, characterized in that the channels (12; 13; 14; 16; 17; 18) are arranged with equal spacings in the circumferential direction.
18. Printing unit according to Claim 17, characterized in that two channels (12; 13; 14; 16; 17; 18) are arranged offset relative to one another by approximately 180° in the circumferential direction.
19. Printing unit according to Claim 1, characterized in that the channel (12; 13; 14; 16; 17; 18) has at least one retaining device (26; 33).
20. Printing unit according to Claim 1, characterized in that the blankets (09) are in each case multilayer, having a support sheet (21) and a layer (22) bound to the support sheet (21).
21. Printing unit according to Claim 1, characterized in that the channel (14) of the transfer cylinder (02; 07) is inclined by 30° to 60° to the tangent of the lateral surface.
22. Printing unit according to Claim 1, characterized in that the channel (12; 13) of the forme cylinder (03; 08) is inclined by 30° to 60° to the tangent of the lateral surface.
23. Printing unit according to Claim 21 or 22, characterized in that the inclination is about 45°.
24. Printing unit according to Claim 1, characterized in that the continuous channel (14) of the transfer cylinder (02; 07) extends virtually over the total length of the body of the transfer cylinder (02; 07) up to the end face or except for an end edge.

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