DE102008001732A1 - Device for adjusting clamping pressure of two blanket cylinders of double printing unit in rubber-against-rubber-system, is provided with two frame elements, where arresters are adjusted - Google Patents

Abstract

The device is provided with two frame elements (09,11), where the arresters are adjusted, which configure the relative position between the former frame element and the latter frame element, when the frame elements are locked with each other.

Description

The The invention relates to a device for adjusting the contact pressure two juxtaposed blanket cylinders in a double printing unit according to the features of claim 1.

at the so-called "rubber-against-rubber" printing in a double printing unit of a web offset press will be simultaneously on Bahnober- and Bahnunterseite, so "rubber against rubber" printed. The blanket cylinder is used to print the image of the plate cylinder to transfer to the paper while doing so because of his elastic (soft) surface for a good Expression. The blanket cylinder is the same time Impression cylinder for the other blanket cylinder. For printing on and off is the blanket cylinder mounted in eccentric bushings or on levers; he becomes pneumatic or moved hydraulically. Therefore, precautions must be taken when Drive are taken, which allow this mobility.

The "rubber-against-rubber" system is referred to in vertical trajectory as the bridge pressure unit and usually in modular design with several printing units on top of each other stacked, for example, as an eight-tower, as he prefers for the printing of two-sided four-color products for the Newspaper printing is used more and more.

The Transfer of color from the printing form to the paper or other Substrates requires process-specific contact forces. These are about 0.8 to 2 MPa for offset printing and be between the blanket cylinders or between blanket cylinder and impression cylinder generated and are relevant for the quality of the printed product.

One Blanket cylinder provides durable only when properly employed the desired function. Too little employment leads due to the tolerances of concentricity and cylindricity too an uneven print image. Too high Employment affects as a result of internal friction and pressure overload disadvantageous to the life of the roll cover

From the WO 2005/037553 A1 is a bridge-type printing machine with a fixed and a sliding frame part known. Each frame member has at least one, the printing gap bounding blanket cylinder, a forme cylinder and an inking unit, which are mounted between side frame plates. The sliding frame member is mounted on rollers, so that in the spaced position, a gap between the pairs of blanket cylinders is created, can occur in the operator for maintenance. After completion of the maintenance work, the sliding frame part is pushed back to its original position and locked with the fixed frame part.

From the WO 2006/111555 A2 is a printing unit and a method for setting a pressure-on position known in which without major mechanical intervention optimal for the respective conditions Anstellkraft at the nip points of the printing unit from a distance, that is from the control center, is automatically adjustable. The printing unit has at least one displaceable frame part. The cylinders are mounted in linearly adjustable bearings with movable stops and by means of actuators initially force-controlled without travel limitation and fixed after employment with a defined line force at the nip in this Anstelllage. As a result, the respective cylinders can be automatically adjusted in position for example for a new configuration, a new blanket, a different type of paper and the like.

The automatic adjustment of the contact pressure presupposes that each bearing to be set, so two per cylinder, with the equipped with actuators necessary for the automatic function have to be. In addition, the possibility must exist, the hydraulic Setting pressure for the actuators to vary individually. Of the Setting process takes for a tower, or a figure-eight printing unit about five minutes. It also always the pressure between plate cylinder and blanket cylinder re-adjusted, although this setting is not paper dependent. To vary the nip So all cylinders must be adjusted in their relative position become.

Of the Invention is based on the object, a device for adjustment the contact pressure of two juxtaposed blanket cylinder to create in a double printing.

The The object is achieved by the features of claim 1.

In a printing unit in rubber-against-rubber system with a fixed and a displaceable frame part, through which the printing unit is divisible at the nip, is an adjustable stop provided by which the size of the printing nip and thus the contact pressure of the blanket cylinder when locked Rack parts is determined. The stop or its setting So determines the relative position of the frame parts, and thus the Blanket cylinder to each other.

The achievable with the present invention consist in particular that the setting of the Contact pressure in the printing unit is very quick and easy to make and the overall solution is relatively inexpensive. To be considered particularly advantageous is that the relative position of the arranged in a frame half cylinder remains the same even when adjusting the pressure gap. The adjustment can be made advantageously during the paper feed in the open position of the frame parts.

In In a preferred embodiment, the stop is off six partial stops formed, which on the side walls of the movable frame part evenly distributed are arranged, preferably at the bottom, center and top. It but is also possible, further partial stops provide and this example, each at the height to arrange a blanket cylinder.

At the fixed frame part is provided a stop surface, at the partial stop of the sliding frame part when closing the printing unit comes to rest. After locking the frame parts so is the distance between the blanket cylinders (printing gap) the individual frame parts by setting the stop, or the individual partial stops determined. It is essential Ensure that all divisional stops have the same setting have before the frame parts are locked. Could do this For example, sensors the settings of the respective partial stops capture and locking the frame parts of a control unit only be released if the settings of all partial stops are the same.

The Partial stops are preferably in several steps of 0.02 to about 0.04 mm increment lockable. It can the individual steps determined by specifications of different paper types be. Advantageously, the adjustment options of the partial stops according to the type of paper to be processed or color-coded, which makes it easier for the operator to adjust.

The Partial stops are either manually or by means of an actuator adjustable. In a preferred embodiment is an adjustment device for the partial stop with a Gear provided to practically realize the small adjustment paths to be able to.

One Embodiment of the invention is in the drawings and will be described in more detail below.

It demonstrate:

1 a printing unit in the "rubber-against-rubber" system in a schematic side view;

2 the printing unit according to 1 in open position;

3 a preferred embodiment of a stop;

4 a second preferred embodiment of a stop.

1 shows a schematic side view of a known in its basic structure per se printing unit 01 in bridge construction. In 2 is the printing unit 01 shown in their open position.

A vertical through the printing unit 01 guided train 02 , In particular a material web 02 will be in the printing unit 01 four-sided (4-color) printed on both sides.

The printing unit 01 comprises four vertically stacked double printing units 03 , The double printing units 03 are each made by two printing units 04 formed, which ever a blanket cylinder 06 , a form cylinder 07 , as well as an inking unit 08 and optionally a dampening unit (not shown).

The printing works 04 are in a first frame part 09 and in a second frame part 11 stored, of which at least one frame part 09 ; 11 is slidable in a known manner for maintenance, so that the printing unit 01 at a nip point 12 by moving the one frame part 09 ; 11 can be driven apart and an operator between the frame parts 09 ; 11 can occur (see 2 ).

For fixing the side frame parts together 09 ; 11 in its functional position, ie in the position in which the pressure unit 01 in production, are the frame parts 09 ; 11 with locking devices (not shown) locked together.

For this purpose, at least one locking device is provided, preferably at least one locking device for each side of the frame 09 ; 11 ie for each side frame pairing 09 ; 11 , It is particularly preferred if at least two closing devices are provided on each side, in particular three closing devices on each side, or, in the case of another format to be printed, four closing devices per side. Here, each side frame half is assigned at least one locking device. In the case of several closing devices, these are preferably arranged vertically above one another.

The locking device is preferably by hydraulically actuated, pivotable cylinder educated.

Preferably on the displaceable frame part 11 are on the side walls (in the image plane one behind the other) each three partial stops 13 intended. These are preferably arranged in the vicinity of the closing devices, not shown, or directly to these.

The setting of the partial stops 13 can with open printing unit 01 ( 2 ), for example when setting up a new production.

On the sliding frame part 11 opposite fixed frame part 09 are preferably stop surfaces 14 provided at which when closing the printing unit, the partial stops 13 come to the plant. These stop surfaces 14 For example, sensors may have to check for equal adjustment of all partial stops. Of course, the partial stop 13 also on the fixed frame part 09 be provided while the stop surface 14 on the movable frame part 11 is arranged.

For adjusting the printing gap and thus the contact pressure of the blanket cylinder 06 to each other is the partial stop 13 adjustable in the direction of an adjustment axis.

The implementation of a stop is known to those skilled in principle and requires no detailed explanation. The partial stops 13 can be carried out in all known forms and reactions. The person skilled in the art will use the adjustment means known to him to adapt the stop according to the requirements of the accuracy of the given situation. Exemplary are in the 3 and 4 possible embodiments for the partial stop shown.

The partial stop 13 can be used as a stepped stop, for example 13 ( 3 ). The partial stop 13 has several stages 16 in the illustrated preferred embodiments, four stages 16 , which have a height difference h to each other. The height difference h is to be adapted to the requirements of the printed products and is preferably about 0.02 to 0.04 mm per step.

By a vertical shift of the partial stop 13 on an adjustment axis 17 can each be another one of the stages 16 opposite the stop surface 14 be positioned. As a result, when closing the printing unit, the size of the printing gap is set.

Another example of an embodiment of the partial stop is a revolver stop 18 ( 4 ). Similar to the manner described above, the revolver stop 18 five levels 16 on, which vary in height by the height difference h. By turning the revolver stop 18 around the adjustment axis 17 each becomes a different level 16 opposite the stop surface 14 positioned and thus made the setting.

For a particularly simple operation, the steps 16 For example, be marked by different colors, so that the setting can be checked very quickly.

01

printing unit

02

Train; web

03

Double printing

04

printing unit

05

06

Blanket cylinder

07

form cylinder

08

inking

09

Frame part; Side frame part

10

11

Frame part; Side frame part

12

Nipstelle

13

Attack; Part stop; stepped stop

14

stop surface

15

16

step

17

adjustment axis

18

Attack; Part stop; turret stop

H

height difference

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• WO 2005/037553 A1 [0006]
• WO 2006/111555 A2 [0007]

Claims (12)

Device for adjusting the contact pressure of two blanket cylinders ( 06 ) in a double printing unit ( 03 ) with rubber-against-rubber system, which with at least a first frame part ( 09 ) and a second frame part ( 11 ) is provided, in which in each case at least one of the two mutually blanketed blanket cylinder ( 06 ) is mounted, wherein at least one adjustable stop ( 13 ; 18 ), wherein the setting of the stop ( 13 ; 18 ) the relative position between the first frame part ( 09 ) and the second frame part ( 11 ), when the frame parts ( 09 ; 11 ) are locked together. Device according to claim 1, characterized in that the stop ( 13 ; 18 ) several partial stops ( 13 ; 18 ), which on two parallel side parts of the first frame part ( 09 ) or the second frame part ( 11 ) are arranged evenly distributed. Apparatus according to claim 2, characterized in that the stop six partial stops ( 13 ; 18 ) provided on each of the side parts of the first or second frame part ( 09 ; 11 ) are arranged centrally, down and up. Apparatus according to claim 2, characterized in that in each case a partial stop ( 13 ; 18 ) on each of the side parts at the height of the axis of rotation of a blanket cylinder ( 06 ) is arranged. Device according to one of claims 2 to 4, characterized in that each partial stop ( 13 ; 18 ) in several stages ( 16 ) is adjustable, that the size of the pressure gap in the stages ( 16 ) is adaptable to different types of paper to be processed. Device according to claim 5, characterized in that the partial stop ( 13 ) a step stop ( 13 ) with four stages ( 16 ), which are each offset horizontally by a height difference h, wherein when the step stop ( 13 ) along an adjustment axis ( 17 ) one each of the stages ( 16 ) on an oppositely arranged stop surface ( 14 ) comes to a stop. Device according to claim 5, characterized in that the partial stop ( 18 ) a revolver stop ( 18 ) with five levels ( 16 ), which vary in height by a height difference h, wherein upon rotation of the revolver stop ( 18 ) about an adjustment axis ( 17 ) one each of the stages ( 16 ) on an oppositely arranged stop surface ( 14 ) comes to a stop. Device according to one of claims 5 to 7, characterized in that the stages ( 16 ) have a height difference h of 0.02 to 0.04 mm. Device according to one of claims 5 or 8, characterized in that the steps ( 16 ) at the partial stop ( 13 ; 18 ) are labeled with the paper types to be processed or are marked in color. Device according to one of claims 2 to 9, characterized in that the partial stops ( 13 ; 18 ) are manually adjustable. Device according to one of claims 2 to 10, characterized in that the partial stops ( 13 ; 18 ) are each adjustable by means of an actuator. Device according to one of claims 1 to 11, characterized in that the partial stop ( 13 ; 18 ) each comprising an adjusting device with an integrated transmission.