EP1459894A2 - Method for mounting a covering on the surface area of a cylinder in a printing machine - Google Patents

Abstract

The assembly to fit a printing plate (01) at the cylinder (02) of a printing press, and especially a rotary offset printing press, has at least one limit stop (14) and at least one roller (17). The limit stop is in front of the roller in the fitting direction (M) of the plate. The limit stop is angled towards the cylinder. The plate has a bent edge (07) at its leading end, so that the leading end butts against the limit stop with the bent edge against the cylinder surface (04).

Description

The invention relates to a method for mounting an elevator on a lateral surface of a cylinder of a printing press according to the preamble of claim 1.

DE 100 24 329 A1 discloses a device for assembling and disassembling at least one elevator on or from a cylinder of a printing press with the aid of a plurality of rollers arranged along the cylinder, with a stop arranged fixedly and spaced from the cylinder with a Cylinder-facing slope supports the exact creation of an end of the elevator that leads in the assembly direction. Furthermore, one or more rollers can be pivoted in front of the stop in the mounting direction and can be adjusted to the cylinder. According to one exemplary embodiment, a bent end of a printing form lies on the cylinder in front of a channel opening in the production direction of the cylinder, while this end strikes the stop. This arrangement cannot effectively support the insertion of a hanging leg formed on the leading end of the elevator into an opening in the cylinder.

From EP 0 678 383 A1 a device for changing printing forms on rotary printing presses is known, in which a printing form removed from a form cylinder, after being completely removed from the form cylinder, temporarily rests with its bent front end on a pressure roller set on the form cylinder until im Further course of the removal of the printing form, the latter is conveyed upwards against gravity along an extension slope until the front end of the printing form is finally put down on an angled holding bracket arranged in the front area of the extension angles. For a new printing form to be mounted on the forme cylinder, the device has two holding elements which delimit an insertion bevel in the front area and can be moved linearly in opposite directions in the axial direction of the forme cylinder, on which the front end of the printing form to be newly mounted rests until the new printing form is assembled. To assemble the new printing form, the holding elements are moved away to the side so that they open the way to the form cylinder for the new printing form.

From EP 1 084 838 A1 a rotary printing press with a device is known, a printing form to be newly mounted on a forme cylinder being pushed out of the device until its front end in the assembly direction touches a pressure roller placed on the form cylinder. The new printing form is then drawn onto the outer surface of the forme cylinder. There is no indication of alignment of the printing form using the pressure roller.

DE 197 19 559 A1 discloses a device for mounting an elevator on a cylinder of a printing press, the device having two slides arranged one behind the other in the circumferential direction of the cylinder and aligned parallel to one another, an acute-angled bend at the leading end of the elevator to be assembled, the slider and a slot-shaped opening formed on the lateral surface of the cylinder have an equally acute opening angle with respect to a tangent lying on the opening, the bent end of the elevator at its leading end against the rear end in the circumferential direction of the cylinder on the lateral surface of the cylinder-operated slide is guided and strikes there, while the front slide in the circumferential direction of the cylinder is turned off from the outer surface of the cylinder, the front slide for mounting an elevator facing the bevel with one of the outer surface Pushes the surface into the opening, a roller element arranged behind the rear slide in the assembly direction of the elevator and connected to this slide being provided.

EP 1 101 612 A2 discloses a method and a device for automatically applying a printing plate to a plate cylinder in a rotary printing press, the printing plate gripped by a gripper with its beveled, leading end being arranged essentially radially against a parallel to the plate cylinder and with guided this cooperating transfer cylinder and aligned by setting up this end on the outer surface of the transfer cylinder parallel to the plate cylinder, the end of the printing plate being set up on an arc piece facing the plate cylinder on the outer surface of the transfer cylinder.

US Pat. No. 5,671,674 A discloses a method and a device for mounting a printing forme brought up to a forme cylinder, the printing forme having an acute-angled bend at its leading end, a rolling element being provided, the rolling element being attached to the forme cylinder on the leading end rolls of the printing form and thereby presses the fold of the printing form into an opening formed on the lateral surface of the forme cylinder.

EP 1 155 840 A discloses a method and a device for mounting a printing forme brought up to a forme cylinder, the printing forme having an acute-angled bend at its leading end, a rolling element being provided on the forme cylinder and rolling on its outer surface being provided, wherein the leading end of the printing form is guided against the rolling element, wherein the rolling element presses the fold at the leading end of the printing form into an opening formed on the lateral surface of the form cylinder as soon as the opening and the fold oppose each other during rotation of the form cylinder.

The invention has for its object to provide a method for mounting an elevator on a lateral surface of a cylinder of a printing press.

The object is achieved by the features of claim 1.

The advantages that can be achieved with the invention consist in particular in that, with the proposed method, an elevator to be clamped on a cylinder is fed by means of a stop to an opening in the cylinder such that it is drawn in largely automatically during its rotation for its fastening in the opening. In addition, the risk of injury is reduced, in particular in a device with a stop arranged in front of a rolling element, because the proposed arrangement of the stop and rolling element prevents access to dangerous locations of the rotating parts.

Exemplary embodiments of the invention are shown in the drawings and are described in more detail below.

Fig. 1

eine Vorrichtung zum Ausrichten eines an einen Zylinder einer Druckmaschine herangeführten Aufzugs mit einem Anschlag und einem vom Zylinder abgestellten Wälzelement;

Fig. 2

eine Vorrichtung zum Ausrichten eines an einen Zylinder einer Druckmaschine herangeführten Aufzugs mit einem Anschlag und einem vom Zylinder angestellten Wälzelement;

Fig. 3

eine Vorrichtung zum Ausrichten eines an einen Zylinder einer Druckmaschine herangeführten Aufzugs mit einem Wälzelement als Anschlag.

Show it:

Fig. 1

a device for aligning an elevator brought up to a cylinder of a printing press with a stop and a rolling element set off from the cylinder;

Fig. 2

a device for aligning an elevator brought up to a cylinder of a printing press with a stop and a rolling element set by the cylinder;

Fig. 3

a device for aligning an elevator brought up to a cylinder of a printing press with a rolling element as a stop.

In a printing press, e.g. B. a web offset printing press, rolls with at least one elevator 01, z. B. a preferably flexible printing form 01 assignable cylinder 02, in particular forme cylinder 02 on an impression cylinder 03, z. B. from a transfer cylinder 03. The forme cylinder 02 has on its lateral surface 04 at least one slot-shaped opening 06, preferably running longitudinally to the forme cylinder 02, into which a bevel 07 attached to one end of the elevator 01 can preferably be positively hooked.

The elevator 01, the z. B. is designed as a plate-shaped printing form 01 or as a support plate carrying a printing blanket, has a substantially rectangular area with the length L and the width. The surface has a support side with which the elevator 01 rests in the assembled state on a lateral surface 04 of a cylinder 02. The side opposite the support side is a work surface which, in the event that the elevator 01 is designed as a printing form 01, is provided with a printed image or at least can be provided with a printed image. The elevator 01 has two opposite ends, the bevel 07 being attached as an angled hanging leg at at least one end, the hanging leg extending over the width of the elevator 01. The surface of the elevator 01 is flexible at least along the length L and can be adapted to the curvature of the peripheral surface 04 when the elevator 01 is applied to the lateral surface 04 of the cylinder 02. In the assembled state of the printing form 01, the length L of the surface thus runs in the direction of the circumference of the cylinder 02, whereas the width of the surface extends in the axial direction of the cylinder 02.

The at least one suspension leg of the elevator 01 is fastened by means of a holding device, the holding device being arranged in a channel, the channel generally extending in the axial direction to the cylinder 02. An end of elevator 01 which is aligned with the production direction P of cylinder 02 is referred to as its leading end, whereas the opposite end is the trailing end of elevator 01. The production direction P of the cylinder 02 is the direction of rotation of the cylinder 02 during the printing process. At least the ends the elevator 01 with the integrally formed hanging legs consist of a rigid, for. B. metallic material, e.g. B. made of an aluminum alloy. Usually the material thickness of the elevator 01 or the material thickness of at least the hanging legs is a few tenths of a millimeter, e.g. B. 0.2 mm to 0.4 mm, preferably 0.3 mm. Thus, the elevator 01 as a whole or at least at its ends consists of a dimensionally stable material, so that the ends can be permanently deformed by bending against a material-specific resistance.

In a preferred embodiment, hanging legs are formed at both ends of the elevator 01 along a bending edge, the hanging legs being insertable into a narrow, in particular slot-shaped opening 06 of the cylinder 02 and being fastened there by means of the holding device. Relative to the length L of the non-curved, flat surface or support side of the unassembled elevator 01, at one end a hanging leg on a bending edge with an opening angle α1 or at the other end a hanging leg on a bending edge with an opening angle β1 is folded, whereby the opening angle α1; β1 are usually between 30 ° and 140 °. If the opening angle α1 is assigned to the leading end of the elevator 01, it is preferably of acute angle, in particular it is 45 °. The opening angle β1 at the trailing end of the elevator 01 is often preferably designed to be greater than 80 ° or obtuse, in particular it is 85 ° or 135 °. The folded hook leg at the leading end has a length l1, which, for. B. is in the range of 4 mm to 11 mm, in particular between 4 mm and 8 mm, with 6 mm being the preferred dimension. The folded hook leg at the trailing end has a length l2, the z. B. 6 mm to 15 mm, in particular 8 mm and 12 mm, with the shorter length being preferred, in order to ensure that the hanging legs can be removed from the opening 06 of the cylinder 02 as simply as possible.

The cylinder 02 has at least one narrow, slot-shaped opening 06 with the slot width S on its lateral surface 04, the slot width S being less than 5 mm and preferably being in the range from 1 mm to 3 mm. The opening 06 has a front edge 26 and a rear edge 27 in the production direction P of the cylinder 02. An acute opening angle α2 is formed between the wall extending from the front edge 26 to the channel and an imaginary first tangent T1 lying on the lateral surface 04 of the cylinder 02 on the opening 06, which is between 30 ° and 50 °, preferably 45 ° is. The beveled suspension leg at the leading end of the elevator 01 can thus preferably be positively attached to this front edge 26 of the opening 06 because the suspension angle at the leading end of the elevator 01 is preferably adapted to the aperture angle α2 in its opening angle α1. The same applies to the trailing end of the elevator 01. An opening angle β2 is formed between the wall extending from the rear edge 27 to the channel and an imaginary first tangent T1 resting on the lateral surface 04 of the cylinder 02 on the opening 06 , which is between 80 ° and 95 °, preferably 90 °, or between 120 ° and 150 °, preferably 135 °. The beveled hanging leg at the trailing end of the elevator 01 can thus preferably be positively attached to this rear edge 27 of the opening 06 because the beveled hanging leg at the trailing end of the elevator 01 is at least approximately matched in its opening angle β1 to the opening angle β2.

In the channel (not shown) z. B. at least one preferably pivotally mounted holding means and a preferably biased spring element, the spring element, the holding means z. B. presses against the folded-in suspension leg at the trailing end, which is hooked into the opening 06 on its rear edge 27, whereby the suspension leg is held at the trailing end on the wall extending from the rear edge 27 towards the channel. To release the pressure exerted by the holding means, an adjusting means is provided in the channel, which at its actuation pivots the holding means against the force of the spring element. The holding device accordingly essentially consists of the holding means, the spring element and the adjusting means.

The cylinder 02 can be designed in such a way that several, preferably identical, lifts 01 can be arranged on its lateral surface 04. If the cylinder 02 is designed as a forme cylinder 02, it can z. B. can be assigned with six plate-shaped printing plates 01. It can also be provided that more than one elevator 01 can be attached to the cylinder 02 in the direction of its circumference. So z. B. two axially extending to the cylinder 02 channels are provided with associated openings 06, which are arranged offset on the circumference of the cylinder 02 by 180 ° to each other. With this assignment of the cylinder 02 with two elevators 01 arranged one behind the other along its circumference, the leading end of the one elevator 01 is fastened in the one channel, whereas the trailing end of the same elevator 01 is fastened in the other channel. The same applies to the one or more elevators 01 arranged on this cylinder 02. The elevators 01 which are arranged next to one another in the axial direction of the cylinder 02 can also be arranged offset with respect to one another, for. B. individually or in pairs each by half a length L of the elevator 01, which however requires that additional channels with associated openings 06 or at least parts thereof are introduced into the cylinder 02, which along the circumference of the cylinder 02 to the two aforementioned channels and Openings 06 z. B. are arranged offset by 90 °.

Preferably in the area in front of and between the forme cylinder 02 and the impression cylinder 03, ie in the gap or in that of the lateral surfaces 04 of the cylinder 02; 03 limited space is located along these cylinders 02; 03 extending traverse 08, the z. B. can be a rigid hollow profile with a square cross section and the z. B. is fixed to the forme cylinder 02. At this traverse 08 is either directly or by means of a connector 09, the z. B. an L-shaped bar may be attached, a carrier 11 having a first end 12, with which the carrier 11 is attached to the cross member 08 or to the connector 09. The first end 12 of the carrier 11 is preferably fastened with a connecting element 13, which can be a screw 13 or a rivet 13. The first end 12 of the carrier 11 is thus not articulated, but in particular rigidly clamped.

In the exemplary embodiment shown in FIGS. 1 and 2, at least one stop 14 angled toward the forme cylinder 02 is attached to the first end 12 of the carrier 11 or to the connecting piece 09. The stop 14 has z. B. at least on the side facing the elevator 01 facing a bevel 23 facing the lateral surface 04 of the cylinder 02, an imaginary straight extension of these bevels 23 intersecting the lateral surface 04 of the cylinder 02 at a point C. There is preferably an acute opening angle γ between a second tangent T2 at this intersection C on the lateral surface 04 of the cylinder 02 and the bevels 23 or their extension. The angle γ facing the elevator 01 (shown as an apex angle in FIG. 2) is a maximum of 90 °, preferably 40 ° to 60 °, in particular 45 °. The stop 14 is arranged so close to the lateral surface 04 of the cylinder 02 that an elevator 01, which is preferably brought tangentially to the forme cylinder 02 and is to be assembled, simultaneously hits both the stop 14 and its bevel 07 attached to its leading end on the lateral surface 04 of the Cylinder 02 rests.

By means of the bevel 23 formed on the stop 14 and facing the forme cylinder 02, an alignment of the fold 07 of an elevator 01 to be mounted on the forme cylinder 02 is supported and this fold 07 is fed to the opening 06 made in the lateral surface 04 of the forme cylinder 02, while the forme cylinder 02 rotates in its production direction P. The stop 14 can be designed as a bar 14, which preferably extends longitudinally to the forme cylinder 02 and either in one piece or from several, possibly spaced apart arranged pieces there. Such a bar 14 can simultaneously z. B. take over the function of a finger guard between the forme cylinder 02 and the impression cylinder 03. The stop 14 can, for. B. by means of the previously described connecting element 13 on the carrier 11 or on the connector 09.

At a second end 16 opposite the first end 12 of the carrier 11, at least one rotatably mounted rolling element 17 is arranged such that the rolling element 17 rolls on its lateral surface 04 or on an elevator 01 resting on the lateral surface 04 when it is positioned against the forme cylinder 02 can (Fig. 2), whereby the fold 07 attached to one end of the elevator 01 is pressed into the opening 06 in the lateral surface 04 of the cylinder 02 and an elevator 01 is pressed against the lateral surface 04 of the forme cylinder 02. The axis of rotation 18 of the rolling element 17 therefore runs longitudinally to the forme cylinder 02. The rolling element 17 is preferably designed as at least one or more rollers 17 or as a roller 17.

In the exemplary embodiment shown in FIGS. 1 and 2, the rolling element 17 is arranged behind the stop 14 in the mounting direction M of the elevator 01, so that the stop 14 first of all folds 07 of the elevator 01 to be mounted on the forme cylinder 02 into the lateral surface 04 of the Form cylinder 02 introduced opening 06 feeds. The fold 07 of the elevator 01 stands in the production direction P of the forme cylinder 02 behind the opening 06 on the lateral surface 04 of the forme cylinder 02. During a relative movement between the stop 14 and the lateral surface 04 of the forme cylinder 02, which can be a linear movement of the stop 14 directed against the mounting direction M of the elevator 01, but which is preferably a rotation of the forme cylinder 02 in its production direction P, the fold 07 pushed in the direction of the opening 06 and hooks into the opening 06 in that the fold 07 falls into the opening 06 due to the weight of the elevator 01. During the preferred further rotation of the forme cylinder 02 in its production direction P, the elevator 01 is pulled under the stop 14, ie between an end 22 of the stopper 14 located at a slight vertical distance a14 from the lateral surface 04 of the forme cylinder 02 and preferably facing the forme cylinder 02 and this outer surface 04 of the forme cylinder 02. The distance a14 is only a few millimeters, z. B. 1 to 3 mm. This distance a14 is thus less than a distance a07, which is the height of the bend 07 when this bend 07 stands on the lateral surface 04 of the forme cylinder 02 and has not yet been inserted into the opening 06. In order to ensure that the fold 07 of the elevator 01 is correctly seated on a wall of the opening 06, this correct fit being characterized by a form-fitting contact with the wall, the rolling element 17 positioned on the forme cylinder 02 rolls over the elevator 01, causing the elevator 01 to start the outer surface 04 of the forme cylinder 02 is pressed firmly.

The carrier 11 itself can advantageously as an elastically bendable, i.e. H. reversibly deformable body, which is preferably designed in sheet form. So the carrier 11 z. B. may be formed as a spring plate 11 firmly clamped at its first end 12.

In addition, an actuating means 19 can be provided, the actuating means 19 preferably being designed as a reversibly deformable hollow body 19, for. B. is designed as a hose 19. The actuating means 19 acts on its actuation, ie, for example, when it is acted upon by the pressure medium, on the one hand on the carrier 11 and, on the other hand, is supported on the crossmember 08 (FIG. 1). By actuating the actuating means 19, the second end 12 of the carrier 11 can be deflected in the direction of the forme cylinder 02 by an elastic bending of the carrier 11 and the rolling element 17 can be adjusted to the forme cylinder 02 (FIG. 2). When actuation of the actuating means 19 ends, the carrier 11 returns to its original position due to its elasticity, ie its resilient nature. As a result, the rolling element 17 is from the The lateral surface 04 of the forme cylinder 02 or by an elevator 01 resting on the outer surface 04 of the forme cylinder 02 is turned off again, ie out of contact.

1 and 2 thus show the same exemplary arrangement of a device for guiding, aligning and pressing an elevator 01 against a cylinder 02 of a printing press in two different operating states, namely in FIG. 1 in the operating state with a rolling element 17 turned off and in FIG 2 in the operating state with an engaged rolling element 17. In both exemplary embodiments, the proposed device aligns an elevator 01, which is brought up to the cylinder 02, to an opening 06, which is preferably slit-shaped and which is introduced into the cylinder 02, so that a cylinder 02 in the direction of production P at the leading end End of the elevator 01 attached 07 can be attached in the opening 06.

If the adjusting means 19 is installed between the carrier 11 and the cross member 08, it is advantageous, for. B. on the carrier 11 to form or attach a bar 21 which protects the actuating means 19 from inadvertent slipping out or removal from its location.

For some applications, e.g. B. with an arrangement of several printing plates 01 in the axial direction side by side on the lateral surface 04 of the forme cylinder 02, it is advantageous to arrange a plurality of supports 11 with at least one rolling element 17 on the cross member 08 in the axial direction, the supports 11 being independent of one another can be turned on or off individually or in groups by actuating means 19 assigned to them on cylinder 02 In this way, a single rolling element 17 or a group of rolling elements 17 can be used selectively for pressing a specific printing form 01.

In a further exemplary embodiment according to FIG. 3, one is close to the cylinder 02 arranged bar with the function of a stop has been dispensed with. At least one rolling element 17 which can preferably be turned on or off the cylinder 02, e.g. B. a roll extending longitudinally to cylinder 02 or one or more rollers, assumes the function of the stop here by an elevator 01, preferably brought tangentially to cylinder 02, strikes the circumference U of rolling element 17 within an arc piece b17 facing cylinder 02, wherein an attachment point A of the elevator 01 on the rolling element 17 is less distant from the lateral surface 04 of the cylinder 02 than the distance a18 of the axis of rotation 18 of the rolling element 17 from the lateral surface 04 of the cylinder 02. The arc piece b17 lies between two legs 28; 29 of an opening angle δ, where an apex of the opening angle δ coincides with the axis of rotation 18 of the rolling element 17, a leg 28 of the opening angle δ forms a perpendicular from the apex to the lateral surface 04 of the cylinder 02 and the opening angle δ is at most 60 °, in particular at most 45 ° is.

As can be seen from FIG. 3, the bend 07 at the front end of the printing form 01 is simultaneously in contact both with the rolling element 17 and with the lateral surface 04 of the cylinder 02. As a result, the rolling element 17 orients the elevator 01 longitudinally to the cylinder 02. During a relative movement between the rolling element 17 and the lateral surface 04 of the cylinder 02, in which the cylinder 02 preferably rotates in the production direction P, the rolling element 17 positioned on the cylinder 02 rolls on the lateral surface 04 of the cylinder 02 such that the rolling element 17 the elevator 01, which strikes the rolling element 17 with its bevel 07, leads into an opening 06, preferably slot-shaped, which is introduced into the lateral surface 04 of the cylinder 02 and presses in there for the purpose of holding it. During the assembly of the elevator 01, an operating state also arises in which the elevator 01 brought up to the cylinder 02 strikes the bent piece b17 at its leading end with the bevel 07 and at the same time at least partially into the opening 06 made in the lateral surface 04 of the cylinder 02 protrudes. The orientation of the on the cylinder 02 elevator 01 is accordingly preferably also carried out with respect to the opening 06 in the cylinder 02 in which the fold 07 of the elevator 01 is held. The end of the elevator 01 that is to be aligned on the lateral surface 04 of the cylinder 02 is preferably the end of the elevator 01 that also runs in the production direction P of the cylinder 02.

LIST OF REFERENCE NUMBERS

01

Elevator, printing form

02

Cylinder, forme cylinder

03

Cylinder, impression cylinder, transfer cylinder

04

lateral surface

05

-

06

opening

07

fold

08

traverse

09

joint

10

-

11

Carrier, spring plate

12

End, first

13

Connection element, screw, rivet

14

Stop, bar

15

-

16

End, second

17

Rolling element, roller, roller

18

axis of rotation

19

Adjustment means, hollow body, hose

20

-

21

strip

22

The End

23

slope

24

-

25

-

26

Front edge

27

Rear edge

28

Leg; distance slot

29

leg

A

anchorage point

C

Point, intersection

L

length

M

mounting direction

P

production direction

S

slot width

T1

Tangent, first

T2

Tangent, second

U

scope

l1

length

l2

length

a07

distance

a14

distance

a18

distance

b17

elbow

α1

opening angle

α2

opening angle

β1

opening angle

β2

opening angle

γ

Angle, opening angle

δ

opening angle

Claims (3)

Method for mounting an elevator (01) on a lateral surface (04) of a cylinder (02) of a printing press, the elevator (01) having a bend (07) at least at one end, the bend (07) to the elongated length (L ) of the elevator (01) has an opening angle (α1) of at most 90 °, the elevator (01) being guided against a stop (14) with a slope (23) directed towards the lateral surface (04) of the cylinder (02), wherein the stop (14) during a relative movement between the stop (14) and the outer surface (04) leads the fold (07) of the elevator (01) to an opening (06) in the outer surface (04) in such a way that the fold (07) hooks into the opening (06), the relative movement between the stop (14) and the lateral surface (04) being a rotation of the cylinder (02), with the elevator (01) being behind the stop (14) in the mounting direction (M) Rolling element (17) is arranged, characterized in that the fold (07) grows nd the dead weight of the elevator (01) falls into the opening (06) and is automatically drawn into the opening during the rotation of the cylinder (02) for its fastening. A method according to claim 1, characterized in that the rolling element (17) is placed against the cylinder (02) and, during the rotation of the cylinder (02), rolls over the bend (07) and presses it into the opening (06). Method according to claim 1 or 2, characterized in that the opening (06) made in the lateral surface (04) of the cylinder (02) has a slot width (S) of 1 mm to 3 mm.

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