EP1348550B1 - Cylinder with a mounting device for a flexible upper covering in a processing machine - Google Patents

Abstract

The rubber blanket form cylinder for a printing machine (2) has motor-driven fastening and tensioning clamps (19,20) holding edges of outer and inner membranes (11,12) under tension. The two membranes lie together except where separated by flexible pads (13). The pads may be of different sizes and thicknesses.

Description

The invention relates to a cylinder with a fastening device for a flexible, upper elevator in a processing machine according to the preamble of claim 1.

[State of the art]

A cylinder of this kind is out DE 41 19 823 C1 for fixing a flexible, upper elevator, here referred to as blanket known. The cylinder can be used as a transfer and blanket cylinder of rotary printing machines. In this case, when tensioning an overhead blanket (upper elevator) on the cylinder, an automatic, secure clamping an underlying blanket underlay (lower elevator) are made possible. By designing a arranged in a cylinder channel terminal block with clamping and control legs, the blanket pad should have no way to move or slipping. Trained as a blanket blanket (upper elevator) has at the end a bar, which is releasably secured in a rotatably mounted clamping shaft. By rotating the tensioning shaft (with blanket), the control leg of the clamping bar engages the outer circumference of the tensioning shaft so that the clamping leg of the clamping bar engages one end of the blanket support and fixes that end under pressure against a side surface of the cylinder channel.

Furthermore, it is off DE 101 27 133 A1 a cylinder for a printing machine with an upper and a lower elevator and a clamping device known. The upper elevator is, for example, a rubber blanket of optionally different thickness and the lower elevator is formed from at least one layer, for example at least one paper sheet, of different thickness. The lower elevator is designed to compensate for the different thicknesses of the upper elevator, so that approx a constant total thickness of the lifts is ensured. Accordingly, the lower elevator is also multi-layer executable. The clamping device should allow a position correction of the lower elevator (single or multi-layer) also within a printing press. The lower elevator can preferably be clamped by means of a clamping device having at least one clamping eccentric. The clamping of the lower elevator in the clamping device takes place in particular outside the printing machine, preferably on a finishing table, on which the lower elevator rests planar. After clamping the lower elevator this is used together with the clamping device in the cylinder. Subsequently, the upper elevator on the cylinder each end in a respective clamping device, such as clamping shafts, hooked and stretched by turning, the relative movement of the upper elevator to the cylinder fixed to the lower elevator is frictionally.

A disadvantage of these lifts that an exchange of the lower elevator (single or multi-layered), for example, for the purpose of arranging different thickness lifts, is relatively expensive. A further disadvantage is that the clamping of the lower elevator inside or outside the cylinder is complicated and thereby relatively high set-up times arise for the processing machine.

OBJECT OF THE INVENTION

The invention has for its object to provide a cylinder of the type described above, which avoids the disadvantages mentioned, which allows in particular an improved setting up a lower elevator to a cylinder on the bendable, flexible upper elevator and the set-up times, especially for a lower elevator noticeably reduced.

The problem is solved by the training features of claim 1. Further developments will become apparent from the dependent claims.

Such a cylinder can be used in particular as a blanket or blanket cylinder, alternatively as a plate cylinder, in processing machines such as printing machines, coating or coating machines or in combinations of printing and coating units of processing machines.

As an upper elevator fastened on the cylinder (plate, blanket or forme cylinder), preferably as a printing / lacquer form, in particular blankets (incompressible or compressible, for example with a fabric and / or metal carrier material), offset printing plates (including dry offset plates), flexible high-pressure plates and coating plates (for example with a plastic and / or metal carrier) or lacquer wipes suitable. Alternatively, punching plates, embossing or perforating plates or similar means are also suitable as an upper elevator.

The flexible upper lift to be used in each case on the cylinder is designed as one or more layers.

A first advantage is due to the fact that on a circumference a flexible, upper elevator, preferably a printing plate, carrying cylinder under this upper elevator, a lower elevator (single or multi-layer) can be arranged, which consists of a flexible carrier material and on the at intervals at least one base form, preferably a plurality of juxtaposed, different base forms are arranged. With respect to the thickness and / or the format and / or the subject and / or the material to the printing form, these base forms can be arranged variably on the support material.

A second advantage is that the variable setting of the lower elevator, especially the respective pad shape, on the cylinder side is feasible, so that a complex setup, including the manual removal of the lower lifts or the lower elevator outside the machine is obsolete. In this case, the lower elevator is arranged in at least one separate fixing device fastened inside the cylinder.

A third advantage is given by the fact that to change the lower elevator, the upper elevator, for example, the pressure / paint form, no longer needs to be removed from the cylinder. All that is required is a manual or, preferably, automated loosening of the fastened, previously tensioned upper elevator, with the upper elevator remaining engaged with the fastening device. Thereafter, the lower elevator, especially the respective selected base form, the upper elevator in at least one direction circumferentially in the predetermined position can be set and then the upper elevator, preferably the printing form, stretched again.

In a further embodiment, it is advantageous that the lower elevator is movable to the upper elevator in the axial direction. This makes it possible to realize an exact setting of the selected base form to the upper elevator.

Another advantage is that repeat orders can be carried out with noticeably reduced set-up times. The parameters relating to the thickness and / or the format and / or the subject of the lower elevator to the upper elevator can preferably be stored, for example, in a computer device, so that the parameters can be called up when required during setup. With the present training is the automated or semi-automated setup of the lower elevator, for example, in format variable base forms, feasible, so that, for example, a variable-format coating is feasible.

The changing setup of the lower elevator is supported, for example, supported by a computer.

By setting up the lower elevator with variable base forms, the elevator strength (pressure) and / or the unwinding length (of the printed image) of the upper elevator on the cylinder can be changed. In this way, register differences, for example in multicolor printing or in spot finishes, can also be avoided or corrected.

[Examples]

Fig. 1

eine aus Druck- und Lackwerken gebildete Druckmaschine,

Fig. 2

eine Seitenansicht eines Zylinders mit Aufzügen,

Fig. 3

eine Abwicklung eines unteren Aufzuges in Draufsicht,

Fig. 4

eine Abwicklung des Aufzuges gem. Fig. 3 in Seitenansicht.

The invention will be explained in more detail using an exemplary embodiment. Here are shown schematically:

Fig. 1

a printing press formed by printing and coating plants,

Fig. 2

a side view of a cylinder with elevators,

Fig. 3

a development of a lower elevator in plan view,

Fig. 4

a settlement of the elevator acc. Fig. 3 in side view.

A sheet-fed rotary printing press has any desired number of printing units I combined with coating units II arranged downstream in the conveying direction 9 of the sheets. The last coating unit II follows in the conveying direction 9, a boom III an endlessly circulating conveyor system 8 with sheet holding systems for the purpose of transporting and depositing the sheets on a delivery pile 10.

Each printing unit I has a plate cylinder 1 with at least one inking unit and possibly a dampening unit, furthermore a stationary with the plate cylinder 1 blanket / form cylinder 2 and a pressure cylinder 3 as a sheet guiding cylinder.

Each coating unit II has a blanket / form cylinder 2 with a first or second metering system 6 or 7, for example, a chambered doctor blade system with anilox roll or a two-roll mill according to the pinch roll principle or a roll mill according to the scooping roller principle on. The blanket / form cylinder 2 is in turn in operative connection with a sheet-guiding printing cylinder 3.

Between the sheet-guiding printing cylinders 3 are arranged as a sheet guiding cylinder transfer cylinder 4. Between the coating units II, at least one drying system 5 is arranged, to which a sheet-guiding printing or transfer cylinder 3 or 4 is optionally assigned.

As a cylinder with a fastening device 19 for a flexible, upper elevator 11, for example a printing / lacquer mold, on the cylinder circumference in a processing machine - as already mentioned - plate, blanket or form cylinder can be used. Alternatively, punching or perforating, etc. can be used.

It will be explained in more detail below as a cylinder of the blanket / form cylinder 2. The blanket / form cylinder 2 preferably has an axially parallel Cylinder channel in which the fastening device 19 for the upper elevator 11, for example, a pressure / paint form, is arranged. The fastening device 19 is formed for example by two tension shafts or two tension rails.

Within the cylinder circumference, preferably in the cylinder channel, a fixing device 20 for separately securing a lower elevator 12 between the cylinder circumference and arranged on the blanket / forme cylinder 2 upper elevator 11 is further arranged.

This lower elevator 12 consists of a flexible carrier material 18, preferably a plastic, a paper material or a metallic material, on which at spaced intervals a plurality of base forms 13-15, for example as a first pad form 13, second pad mold 14, third pad mold 15, or in combination adherent are arranged. When viewed separately, each individual backing 13-15 has a defined constant thickness.

The fixing device 20 arranged within the circumference of the blanket / forme cylinder 2 is rotatably drivable or actuatable. For this purpose, preferably a motor, alternatively a manual drive or a corresponding actuation can be used. Preferably, the drive is coupled to a controller. In its end-side fixing regions 16, 17, the lower elevator 12 is received in the fixing device 20. Furthermore, as a result of the drivable fixing device 20, the lower elevator 12 is movable on the cylinder circumference. In this case, at least one of the underlay molds 13, 14, 15 can be positioned by means of the fixing device 20 on the circumference of the cylinder to the upper elevator 11, for example the printing forme, for setting up.

Preferably, the fixing device 20 of two within the blanket / forme cylinder 2 arranged axially parallel, rotatably mounted clamping shafts 21, 22 is formed. In this case, one of the tension shafts 21, 22 as a supply roll for the lower elevator 12 and the other of the tensioning shafts 21, 22 is formed as a winding roller for the lower elevator 12.

At least one of the tensioning shafts 21, 22 is coupled to the motorized or manually operable rotary drive. In a further embodiment, the clamping roller 21 formed as a supply roll can be acted upon by a bias voltage and designed as a take-up reel tensioning shaft 22 is coupled to a rotary drive. In a preferred embodiment, the motor drive is coupled to a device for detecting the position of the respective clamping shaft 21 and / or 22. The means for detecting the position of the corresponding tensioning shaft 21, 22 is coupled to a controller, such as a control station, of the processing machine.

In a further embodiment, at least one of the clamping shafts 21, 22 is arranged within the blanket / forme cylinder 2 in an axially parallel arranged cassette. This encapsulation of the clamping shafts 21, 22 and the stored, lower elevator 12 can be achieved. Preferably, both clamping shafts 21, 22 coupled with one manual or automated drive, wherein at least the clamping shafts 21, 22 received in a cassette and the cassette is completely interchangeable in blanket / form cylinder 2 is arranged. Again, at least one of the clamping shafts 21, 22 can be coupled with a rotary drive and preferably connected in circuit technology with a position detection and a control.

In a further development, lockable adjusting means for aligning the cassette are arranged within the cylinder, here the blanket / forme cylinder 2. Registerpins are suitable for this purpose, for example, so that the same position can always be taken when the cassettes are replaced by the subsequent cassette.

Furthermore, at least one of the tensioning shafts 21, 22 is also mounted so as to be axially movable in addition to the rotatable mounting. For this purpose, at least one of the tensioning shafts 21, 22 is coupled to a drive acting in the axial direction. For example, the drive is designed as a positioning motor. In this case, between the positioning motor and the associated control shaft 21, 22, a clutch can be arranged. The respective clamping shaft 21, 22 is axially movable, so that in addition to the circumferential movement of the lower elevator 12 with the fixing device 20 is also movable in Zylinderachsrichtung. In this case, a device for detecting the axial position of the fixing device 20 or the tensioning shafts 21, 22 can also be coupled to the drive. In a further development, a circuit-technical coupling with the control of the processing machine can also be realized.

The base molds 13, 14, 15 (and, if required, further backing forms) adherently arranged on the carrier material 18 of the lower elevator 12 are optionally different with respect to the thickness and / or the format and / or the subject and / or the material.

Preferably, the carrier material 18 is formed of a uniform material in a uniform thickness. With regard to the different thickness of the base forms 13-15, these are preferably arranged in a stepped manner on the carrier material 18. For example, the first base mold 13 with a constant thickness of 0.25 mm, the second pad mold 14 with a constant thickness of 0.30 mm and the third pad mold 15 with a constant thickness of 0.35 mm executable.

In another embodiment, for example, the base forms 13-15 are formed on the substrate 18 of different materials, for example, to achieve different attenuation and / or a print length compensation. In this case also base forms 13-15 with mutually equal thickness, but different damping properties can be used.

Alternatively, each screened films or vacuum blankets can be used.

In another embodiment, for example, the base forms 13-15 are different on the carrier material 18 for format or subject matter. This arrangement is for example for constantly recurring print / paint jobs advantage.

In a further development, a damping layer can additionally be arranged between the carrier material 18 and the base forms 13-15, which is adhesively bonded to the carrier material 18 of the base forms 13-15 to form a lower elevator 12.

The mode of action is as follows:

The upper elevator 11, for example the printing / lacquer mold, is accommodated in the fastening device 19 and the lower elevator 12 is accommodated in the fixing device 20 within the cylinder 1, 2 and arranged peripherally on the latter.

The fastening device 19 is loosened, ie the upper elevator 11 is relaxed so that the lower elevator 12 between the upper elevator 11 and the cylinder circumference is movable. For this purpose, at least one of the tensioning shafts 21, 22 (fixing device 20) is rotationally driven or actuated so that the support material 18 with the backing forms 13-15 is moved circumferentially in at least one direction. Preferably, the drive is peripherally operable in both directions (forward / backward).

At least one selected base mold 13, 14, 15 is then positioned in each case to the upper elevator 11. Subsequently, the upper elevator 11 is tensioned by means of the fastening device 19. If another of the underlay molds 13-15 is to be used, the fastening device 19 is relaxed, the lower elevator 12 is moved circumferentially until at least one selected underlay mold 13, 14, 15 is assigned individually and in combination to the upper lift 11 and is positioned. Subsequently, the upper elevator 11 is again tensioned on the cylinder 1, 2.

[REFERENCE LIST]

1 -

plate cylinder

2 -

Blanket / form cylinder

3 -

pressure cylinder

4 -

transfer cylinder

5 -

dryer system

6 -

1. dosing system

7 -

2. dosing system

8th -

conveyor system

9 -

conveying direction

10 -

delivery pile

11 -

upper elevator

12 -

lower elevator

13 -

first underlay form

14 -

second base form

15 -

third base form

16 -

first fixation area

17 -

second fixation area

18 -

support material

19 -

Fastening device (upper elevator)

20 -

Fixing device (lower elevator)

21 -

clamping shaft

22 -

clamping shaft

I -

printing unit

II -

coating unit

III -

boom

Claims (10)

1. Cylinder for a processing machine with a fixing device (19) for a flexible outer cover (11), with a fixing device (20) arranged within the periphery of the cylinder for the separate fixing of an inner cover (12) between the periphery of the cylinder and the outer cover (11) arranged on the cylinder, characterised in that the inner cover (12) consists of a flexible carrier material (18) on which are arranged several underlay shapes (13, 14, 15) spaced from one another, that the fixing device (20) can be driven and the inner cover (12) received at fixing regions (16, 17) at its ends in the fixing device (20) is movable on the cylinder periphery and in each case at least one underlay shape (13, 14, 15) can be positioned relative to the outer cover (11).
2. Cylinder according to Claim 1, characterised in that the fixing device (20) is formed from two rotatably mounted tensioning shafts (21, 22) arranged axially parallel within the cylinder (1, 2) and that one of the tensioning shafts (21, 22) is constructed as supply roller and the other of the tensioning shafts (21, 22) as take-up roller.
3. Cylinder according to Claim 2, characterised in that at least one of the tensioning shafts (21, 22) is arranged within the cylinder (1, 2) is arranged in an axially parallel cassette.
4. Cylinder according to Claim 2, characterised in that at least one of the tensioning shafts (21, 22) is linked with a rotary drive.
5. Cylinder according to Claim 2 and 4, characterised in that at least one of the tensioning shafts (21, 22) is mounted axially movable and is linked with a drive operating in the axial direction.
6. Cylinder according to Claim 2 and 4, characterised in that the tensioning shaft (21) constructed as supply roller can be subjected to a pre-tensioning and the tensioning shaft (22) constructed as take-up roller is linked with the drive.
7. Cylinder according to Claim 4 or 5, characterised in that the drive is linked with a device for detecting the position of the respective tensioning shafts (21, 22).
8. Cylinder according to Claim 7, characterised in that the device for detecting the position is linked with a control of the processing machine.
9. Cylinder according to Claim 1, characterised in that the underlay shapes (13, 14, 15) are different depending upon the thickness and/or the format and/or the subject and/or the material.
10. Cylinder according to Claim 1, characterised in that a damping layer can be arranged between the carrier material (18) and the underlay shapes (13-15), which is connected adhesively with the carrier material (18) as well as the underlay shapes (13-15) to an inner cover (12).

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