EP1400355B1 - Devices for adjusting the contact pressure of an adjustably mounted cylinder - Google Patents

Abstract

Device (20) for adjusting a roller (21) arranged in a roller holder (27) positioned on a frame holder (26) comprises at least one actuator (34). The actuator has at least one pressure chamber (36) impinged upon by pressurized material and arranged in a gap (33) between the roller holder and the frame holder. Preferred Features: A height (h36) of the pressure chamber in the radial direction of the roller is shorter than a width (b36) of the pressure chamber in the axial direction of the roller and/or a length of the pressure chamber in the peripheral direction of the roller. The ratio of width and/or length of the pressure chamber to the height of the pressure chamber is greater than 3.

Description

The invention relates to a device for adjusting the contact pressure of an adjustably mounted roller according to the preamble of claim 1.

In conventional printing machines, such as web-fed rotary printing presses, a plurality of rollers are present. In particular, ink rollers are provided which serve to transfer the color from a color memory on the plate cylinder. The ink rollers allow the ink transferred to the plate cylinders to be metered so that the ink is transferred as a uniform film of specific thickness. Disturbances, such as speed fluctuations and torsional vibrations can be compensated.

In addition, dampening rollers may be provided in the printing press, which transfer a dampening solution, such as water, to the printing unit.

Frequently, pairs of rollers are formed by meshing rollers in which at least one of the rollers has a cylindrical surface of elastic material, so that this cylindrical surface can be at least slightly deformed depending on the contact pressure of the opposite roller. As a result, due to the elastic deformation of the roller surface, a contact region which extends in a straight line between the rollers and is referred to as a contact strip results. The width of the contact strip can be varied by creating the contact pressure between the rollers, wherein the width of the contract strip has a significant influence on the printing result. For example, in an inking the contact strip is too narrow, so not enough color is transferred, whereas in cases where the contact strip is too wide, the elastic roller can be damaged by the flexing work occurring.

In order in particular to be able to always set the strip width depending on the operating conditions, for example the temperature of the printing presses or their degree of wear, it is necessary to adjust the roller so that it can be adjusted so that it can move with an actuator with an adjustable force in the direction of the opposite roller can be pressed. If the correct contact pressure is then found between the two rollers, a fixing device for fixing the first roller relative to the second roller is actuated in order to permanently maintain the contact pressure.

From the DE 197 19 305 A 1 is a generic device for adjusting the contact pressure between two rollers known. In the bearing arrangement described therein, the adjustably mounted roller with a spring which is supported on the frame of the printing press, pressed against the opposite roller. As a result, depending on the selected spring characteristic always a certain contact pressure between the two rollers. For fixing the roller in the pressed position, a clamping mechanism with clamping lever and clamping plate is described by which the roller shaft is fixed by frictional engagement on the frame of the printing press.

From the DE 199 19 733 A 1, a device for semi-automatic setting of rolls is known in which the adjustably mounted roll is held in a roll holder, which in turn is mounted on a frame-mounted frame holder. Roller holder and frame holder can be moved against each other and are connected to each other by resilient means. The resilient means in this case have a certain bias, so that the roll holder adjustably mounted on the roller can be pressed with a certain contact pressure against the opposite roller. To lock the roller holder on the frame holder locking bolts are provided by the delivery of the roller holder frictionally on Frame holder can be jammed.

The DE 42 31 673 A1 describes a device for roller adjustment, in which a roller is first displaced in the radial direction by means of a pressure chamber and then fixed.

The DD 64 064 describes a device for clamping bushings of printing cylinders. There is no hint for adjusting rollers.

The DE 100 01 582 A1 discloses a roller which is adjusted by means of two hydraulic cylinders.

The DE 1 561 014 B shows an adjustable roller bearing for applicator rollers of a printing press, wherein two opposite pressure chambers are separated by elastic material.

The US 4,455,727A refers to a friction driven roller for treating web-like intermediates by compression. In this case, pressure pads can be arranged at different angles.

The EP 0 346 619 A2 relates to an adjustment of the relative rotational position between a gear and a coaxially mounted sprocket in a sheet-fed rotary printing press. Sprocket and gear have friction elements, which engage overlapping in the manner of a multi-plate clutch.

The invention has for its object to provide a device for adjusting the contact pressure of an adjustably mounted roller.

The object is achieved by the features of claim 1.

An advantage of the fixing device is, in particular, that such a fixing device is extremely compact and thus space-saving feasible. This is achieved in that for fixing the adjustable components relative to each other several Lammellenelemente be frictionally clamped. By arranging several, in particular a plurality, such Lammellenelemente one behind the other, the friction force required for fixing is distributed to a plurality of friction surfaces between the Lammellenelementen. By clamping the successively arranged Lammellenelemente the clamping force acts in opposite directions in all friction surfaces.

Suitable Lammellenelemente are known for example of Lammellenkupplungen that are used for frictional connection of rotatably mounted axes. In contrast to the known Lammellenkupplungen are in the fixing device Lammellen against each other in at least one direction and can be moved depending on the game between the components of the fixing within a certain adjustment range against each other and then fixed. The adjusting movement thus does not take place, as in the case of a Lammellenkupplung in the manner of a pivoting or rotating movement, but takes place in the manner of a translational movement in the plane, which is defined by the orientation of the friction surfaces of the Lammellenelemente.

As a clamping device, basically all elements or constructions can be used with which the slats can be clamped together applying a sufficient contact pressure. It is particularly advantageous if the clamping device is designed in the manner of a prestressed spring element. In the fixed position of the fixing device such a high spring force is exerted on the Lammellenelemente of the prestressed spring element, so that they are reliably fixed friction against each other. An unintentional release of the fixing device, for example, in case of failure of the power supply, as it is to be feared in other clamping device is excluded. In order to be able to release the clamping device for adjusting the components of the fixing device, in this embodiment, an adjusting element to be provided on the fixing device, with which the spring element can be compressed so far that the Lammellenelemente relaxed and thereby can be moved against each other.

In principle, any drive devices, for example electrical, hydraulic or pneumatic systems, can be used to actuate the spring element. It is particularly advantageous if the adjusting element is designed in the manner of a punch, which is displaceably arranged in a pressure chamber. By acting on the pressure chamber with a pressure medium, for example compressed air or hydraulic fluid, the plunger can be displaced against the spring force of the spring element, so that the Lammellenelemente be relaxed as a result.

The achievable with the present invention consist in particular in the very compact design, which is made possible by the proposed construction. As known from the prior art, the roller is attached to a roller holder, which in turn is slidably mounted on a frame holder. The frame holder in turn can either fixed to the frame fixed to the frame of the printing press, or alternatively be arranged on corresponding adjusting devices, which serve for example the arrival or the parking of the roll holder mounted in the roller relative to the opposite roller.

On the roll holder or on the frame holder, a recess is provided in which engages a portion of the frame holder and the roll holder. The dimensions of the section or of the recess are chosen such that a gap is formed between the recess and the section, by which the adjusting area between roller holder and frame holder is defined. Within this gap, the roll holder can be moved relative to the frame holder. In order to be able to apply the actuating forces required for the adjusting movement, or to be able to press the first roller against the opposite roller with a certain contact pressure, at least one actuator is arranged in the gap, which exerts a tensile and / or compressive force on the roller holder and is supported on the frame holder. Due to the arrangement of the actuator in the gap between the frame holder and roll holder can be extremely compact designs realize. It is of course immaterial whether the recess is provided on the frame holder or roll holder, so basically both types are alternatively conceivable.

The shape of the recess and the engaging portion is basically arbitrary and can be tailored to the particular application. Thus, it is conceivable that the recess is formed at right angles and only in one direction has a game against the engaging portion, so as a result of the Roller holder can only be adjusted in one direction of adjustment. If, on the other hand, an adjustment of the roll holder in different directions is desired, for example because the roller mounted in the roll holder has to be operated on a plurality of rolls, it is particularly advantageous if the recess and the section are each rotationally symmetrical, so that a circumferential gap is formed therebetween. It can thereby be achieved that the roll holder can be adjusted in a positioning plane in different adjustment directions relative to the frame holder, wherein the adjustment range of the adjusting movement is limited by the width of the circumferential gap.

If the roll holder can be adjusted relative to the frame holder in different adjustment directions, for example in an entire set level, several actuators are required to apply the adjusting movement required for this purpose. According to a preferred embodiment, therefore, at least three actuators are arranged in the gap between roller holder and frame holder, with which the first roller can be pressed in different directions. By appropriate choice of the forces applied by the respective actuators can be applied by combined control of the various actuators a resultant force in any direction on the roll holder and thus on the roll holder mounted in the roll. Preferably, the actuators are thereby distributed in a star shape in the gap between the roll holder and the frame holder. If four actuators are arranged opposite one another in each case in the gap, a tilting of the actuators can be reliably ruled out, since the respective opposing actuator is compressed by driving an actuator.

According to a preferred embodiment, a prestressed gas, in particular compressed air, is used as the pressure medium. Since gases are fundamentally compressible, the use of a prestressed gas as the pressure medium results in elastic cushioning which acts between the frame holder and the roll holder. By this cushioning mechanical disturbances, which may be caused for example by imbalance or omission, be compensated. In addition, compressed air is already available as an energy transfer medium in most printing presses.

The device for adjusting the contact pressure between the adjustably mounted roller and an opposite roller can of course also be used to turn on or off the adjustably mounted roller to the other roller. For this purpose, however, the adjustment range between the frame holder and roll holder must be sufficiently large in order to carry out the required adjustment for stopping. In addition, the actuator between the frame holder and roll holder must be suitably selected for carrying out such an adjusting movement. In order to be able to perform the on or off regardless of the operation of the device, it is advantageous if the device is mounted on an additional storage device. This storage device can be designed, for example, in the manner of a swivel arm with which the frame holder can be pivoted relative to the frame of the printing presses between a setting position and a parking position.

By arranging a fixing device in a device for adjusting the contact pressure between two rollers, the overall compactness of the device can be increased further.

For this purpose, it is particularly advantageous if the fixing device is coaxial with the longitudinal axis the roller mounted on the roll holder extends along the central axis of the device.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

Fig. 1

eine schematisch dargestellte Fixiereinrichtung im Querschnitt;

Fig. 2

eine schematisch dargestellte Vorrichtung zum Einstellen des Anpressdrucks zwischen zwei Walzen mit Fixiereinrichtung im Längsschnitt;

Fig. 3

die schematisch im Querschnitt dargestellte Vorrichtung gemäß Fig. 2 in einer Grundstellung;

Fig. 4

die schematisch im Querschnitt dargestellte Vorrichtung gemäß Fig. 2 in einer ausgelenkten Stellung;

Fig. 5

die Vorrichtung gemäß Fig. 2 in einer perspektivischen Ansicht von vorne;

Fig. 6

eine zweite Ausführungsform eines Aktors für die Vorrichtung im Querschnitt.

Show it:

Fig. 1

a schematically illustrated fixing in cross section;

Fig. 2

a schematically illustrated device for adjusting the contact pressure between two rollers with fixing in longitudinal section;

Fig. 3

the device shown schematically in cross section according to Fig. 2 in a basic position;

Fig. 4

the device shown schematically in cross section according to Fig. 2 in a deflected position;

Fig. 5

the device according to Fig. 2 in a perspective view from the front;

Fig. 6

a second embodiment of an actuator for the device in cross section.

In the Fig. 1 shown fixing device 01 has a part, for. B. a main body 02, which is formed from a cover 03 and a sleeve 04, and a displaceable in the sleeve 04 mounted part, z. B. a bolt 06, on the outside of a mounting plate 07 is provided on. The main body 02 can for example be attached to a frame, whereas, for example, a roller lock for supporting a roller can be screwed to the mounting plate 07.

The bolt 06 has radially to the sleeve 04 on a certain game, so that the bolt 06 can be moved relative to the body 02 in a plane that extends perpendicular to the plane in any direction 08 Stellrichtungen. As a result, the fastening plate 07 can be displaced upwards or downwards, for example, in the direction of the movement arrow 08. Due to the circular symmetrical design of the fixing device 01 but also positioning movements can be realized in any other directions within the working plane. On the main body 02 Lammellenelemente 09 are fixed at equidistant intervals on the inside of the sleeve 04, which mesh with attached to the bolt 06 Lammellenelementen 11. The contact surfaces between the Lammellenelementen 09; 11 extend in planes that runs parallel to the plane of the possible positioning movements. During the adjustment of the bolt 06 relative to the main body 02 slide the Lammellenelemente 09 along the Lammellenelemente 11, wherein the adjusting movement is limited by the play between pin 06 and body 02.

For fixing the fixing device 01 in a certain position is a clamping device 12 with a plunger 15 which is slidably mounted in a pressure cylinder 16, is provided. Through the port 13, a pressure chamber 14 with a pressure medium, such as a hydraulic oil or compressed air, are acted upon, so that the plunger 15 is pressed in the pressure cylinder 16 in the direction of the Lammellenelemente 09 and 11 respectively. As a result, thereby the Lammellenelemente 09; 11 between the clamping device 12 and an integrally formed on the sleeve 04 end stop 17 is clamped. Once the surface pressure between the plunger 15 and the foremost Lammellenelement 11 exceeds a certain pressure, the individual Lammellenelemente come 09; 11 with the formation of a state of static friction frictionally against each other to the system, so that the pin 06 is fixed relative to the body 02.

In Fig. 2 is a device 20 for adjusting the contact pressure between a first Roller 21 and a second roller 22 are shown. The roller 21 can be releasably secured to the ends of its axle 23 on a device 20 provided on the quick release 24. Such quick fasteners 24 are known from the prior art and have a semicircular bearing shell into which the ends of the roller shaft 23 can be inserted. By attaching a in Fig. 2 not shown upper bearing shell then the roll axis 23 can be fixed to the quick release 24.

The device 20 is essentially composed of a frame holder 26 and a roller holder 27, which can be displaced relative to each other in a plane which extends perpendicular to the plane of the drawing against each other. The frame holder 26 is constructed of a base plate 28 which can be pivotally attached to the frame of a printing press, for example by means of a pivoting arm, and a sleeve body 29. On the side facing the roller 21, the sleeve body 29 has a recess 31 into which a cylindrical portion 32 of the roller holder 27 engages. The inner diameter of the recess 31 and the outer diameter of the portion 32 is selected so that a circular cylindrical gap 33 in the basic position with a gap width of about 1 mm to 10 mm, in particular of 2 mm, forms. Through the gap 33, the maximum adjustment range for adjusting the roller holder 27 is defined relative to the frame holder 26.

In order to be able to realize the adjustment movements required in the setting of the roller 21 or to be able to apply the desired contact pressure between the roller 21 and the roller 22, a total of four actuators 34 designed in the manner of pressure hoses are distributed in the gap 33 over the circumference, of which in Fig. 2 only two are shown in section, arranged. About in Fig. 2 not shown leads 48 (see Fig. 5 ), the pressure chambers 36 formed by the wall of the actuators 34 can be pressurized. Depending on the respective pressure conditions in the four actuators 34 acts on the roller holder 27, a resultant force, so that corresponding control of the pressure in the actuators 34, the roller 21 can be pressed with the desired contact pressure against the roller 22. Since the air cushion pressurized in the actuators 34 is compressible, mechanical disturbances can be absorbed by the resulting spring action.

In the apparatus 20, a height h36 of the pressure chamber 36 in the radial direction of the roller 21 is smaller than a width b36 of the pressure chamber 36 in the axial direction of the roller 21 and / or a length l36 of the pressure chamber 36 in the circumferential direction of the roller 21 (see also FIG Fig. 5 ).

The ratio of width b36 and / or length l36 of the pressure chamber 36 to the height h36 of the pressure chamber 36 is greater than 3, in particular greater than 5 (see Fig. 5 ).

To fix the roll holder 27 relative to the frame holder 26 27 Lammellenelemente 37 are fixed to the roll holder which are arranged with the sleeve body 29 attached to the Lammellenelementen 38 to form a Lammellenpakets meshing. For frictional obstruction of the Lammellenpakets formed from the Lammellenelementen 37 and 38 is a cross-sectionally T-shaped punch 39 is provided, the circular punch head 40 comes with an annular flange 41 at the outermost Lammellenelement 38 of the Lammellenpakets to rest. At the opposite end of the punch 39, a pressure plate 42 is fixed, on which the spring force of a formed in the manner of a plate spring package spring element 43 acts. The spring element 43 is biased between the pressure plate 42 and the sleeve body 29 mounted so that the Lammellenelementen 37; 38 formed Lammellenpaket by the spring force from the punch 39 on the Lammellenelemente 37; 38 is jammed.

For adjusting the roller holder 27 relative to the frame holder 26, in particular when setting the contact pressure between the rollers 21; 22 must be that of the Slab elements 37; 38 and the punch 39 and the pressure plate 42 formed fixing device can be solved. For this purpose, a pressure port 44 is provided in the base plate 28, through which a pressure chamber 46 between the pressure plate 42 and the base plate 28 with a pressure medium, such as compressed air can be applied. As soon as the air pressure acting on the pressure plate 42 exceeds the spring force of the spring element 43, the punch 39 is lifted as far as the outermost Lammellenelement 38 that they are no longer frictionally clamped and can be relatively moved against each other.

The adjustment of the contact pressure between the rollers 21; 22 takes place, for example, in the following manner. First, the pressure chamber 46 is subjected to a sufficient pressure, so that the Lammellenelemente 37; 38 are no longer frictionally clamped. Subsequently, the actuators 34 are each acted upon with just enough pressure that the desired contact pressure between the rollers 21; 22 or between the roller 21 and others, in Fig. 2 not shown forms rollers and leads to a contact strip of the desired width. Once the right setting with the desired contact pressure between the rollers 21; 22 is found, the pressure chamber 46 is depressurized, whereby the punch 39, the Lammellenelemente 37; 38 clamped together so that the roller holder 27 is fixed relative to the frame holder 26 in the desired position. Finally, the actuators 34 are depressurized.

In 3 and 4 is the principle of action of the device 20 shown in the required adjusting movement in a schematic manner. Fig. 3 shows the frame holder 26 with the recess 31 and the engaging portion 32 of the roller holder 27. By the choice of dimensions between the frame holder 26 and the portion 32 of the roller holder 27, a gap 33 is formed, in which the 3 and 4 only schematically indicated by force arrows actuators 34 are arranged. The possible adjusting movements between the frame holder 26 and the roll holder 27 are through a place level, which is in the representation of FIG. 3 and FIG. 4 extends in the plane of the drawing, defined, wherein the adjustment range of the adjusting movements by the width of the gap 33 is limited.

As in Fig. 4 By way of example, the roller holder 27 and, as a result, the roller 21 attached thereto can be displaced laterally relative to the frame holder 26, which is effected by a corresponding actuation of the actuators 34 and the consequent force action on the section 32. Once the desired position of the roller holder 27 is found relative to the frame holder 26, which of the Lammellenelementen 37; 38 or the punch 39 and the pressure plate 42 formed fixing device are actuated so that the position is permanently fixed and the actuators 34 need not be driven further.

Fig. 5 shows the device 20 with the base plate 28, the frame holder 26, the roll holder 27 and the actuators 34 in a perspective view from the front. Between the sleeve body 29 of the frame holder 26 and the roll holder 27, on the forwardly directed side of the half-shell-shaped quick release 24 is partially visible, the four designed in the form of pressure hoses actuators 34 are arranged, which can be acted upon by supply lines 48 with compressed air. By means of the pressure plate 42, the unrecognizable Lammellenelemente 37; 38 relaxed.
It can be seen the extremely compact design of the device 20, which has a smaller diameter than the roller 21 itself (see Fig.) Due to their overall rotationally symmetrical design (apart from the base plate 28) Fig. 2 ).

Fig. 6 shows a second embodiment 50 of an actuator 50 for a device 20 in cross section. The basic structure of the device 20 with frame holder 26, roller holder 27 and a fixing device for fixing the roller holder 27 relative to the roller holder 26 corresponds to the Fig. 2 described structure and therefore need not be explained further. To form the actuator 50 is in the gap 33 a cylindrical diaphragm 51 whose upper and lower edges are connected to the inner diameter of the sleeve body 29 (in FIG Fig. 6 not shown) arranged. The membrane 51 is also connected in four strip-shaped regions 52 with the inner diameter of the sleeve body 29, for example glued, so that as a result of the sleeve body 29 and the diaphragm 51 four pressure chambers 53 are formed, which are evenly distributed over the circumference of the gap 33. The pressure chambers 53 can each be acted upon by compressed air via pressure inlet openings 54, so that, depending on the respective pressure in the four pressure chambers 53, a resultant force acts on the section 32 of the roller holder 27.

Again, a height h53 of the pressure chamber 53 of the device (20) in the radial direction of the roller 21 is smaller than a width of the pressure chamber 53 in the axial direction of the roller 21 and / or a length l53 of the pressure chamber 53 in the circumferential direction of the roller 21st

The ratio of width b53 and / or length l53 of the pressure chamber 53 to the height h53 of the pressure chamber 53; is greater than 3, in particular greater than 5.

LIST OF REFERENCE NUMBERS

01

fixing

02

Basic body, part

03

cover

04

shell

05

-

06

Bolt, part

07

mounting plate

08

Motion arrow, adjusting device

09

Lamellar element (02)

10

-

11

Lammella element (06)

12

clamper

13

connection port

14

Pressure chamber (12)

15

Plunger (12)

16

Impression cylinder (12)

17

end stop

18

-

19

-

20

contraption

21

Roller, first

22

Roller, second

23

Axis, roll axis

24

quick release

25

-

26

frame holder

27

roller holder

28

Base plate (26)

29

Sleeve body (26)

30

-

31

Recess (26)

32

Section (27)

33

gap

34

Actuator, pressure hose

35

-

36

pressure chamber

37

Lammella element (27)

38

Lamellar element (26)

39

stamp

40

ram head

41

Flange (40)

42

printing plate

43

spring element

44

pressure connection

45

-

46

pressure chamber

47

48

supply

49

-

50

actuator

51

membrane

52

Attachment section, area

53

pressure chamber

54

Pressure inlet port

b36

Width (36)

h36

Height (36)

136

Length (36)

h53

Height (53)

153

Length (53)

Claims (13)

1. Device (20) for adjusting a roll (21) with at least one actuator (34; 50), the actuator (34; 50) having at least one pressure chamber (36) that can be pressurized with a pressure medium, the actuator (34; 50) throwing the adjustable roll (21) on and off an opposing roll (22), a plurality of pressure chambers (36; 53) being arranged in the circumferential direction of the roll (21), characterized in that a height (h36; h53) of the pressure chambers (36; 53) in the radial direction of the roll (21) is less than a width (b36) of the pressure chambers (36; 53) in the axial direction of the roll (21) and/or a length (I36; I53) of the pressure chambers (36; 53) in the circumferential direction of the roll (21), and in that a fixing unit (01) is provided.
2. Device according to Claim 1, characterized in that at least two pressure chambers can be actuated independently of one another.
3. Device according to Claim 1, characterized in that the roll (21) is arranged in a roll holder (27) and this roll holder (27) is mounted on a frame holder (26), and the pressure chambers (36) are arranged in a gap (33) between roll holder (27) and frame holder (26).
4. Device (20) according to Claim 1, characterized in that a ratio of width (b36) and/or length (I36; I53) of the pressure chambers (36; 53) to the height (h36; h53) of the pressure chambers (36; 53) is greater than 3.
5. Device (20) according to Claim 1, characterized in that at least three pressure chambers are arranged in the circumferential direction.
6. Device (20) according to Claim 1, characterized in that four pressure chambers are arranged in the circumferential direction.
7. Device (20) according to Claim 1, characterized in that the adjustable roll (21) is constructed as an inking roll or dampening roll of a printing press.
8. Device (20) according to Claim 1, characterized in that the fixing unit (01) is constructed as a clamping device.
9. Device (20) according to Claim 1, characterized in that the fixing unit (01) extends in the device coaxially with respect to the longitudinal axis of the roll (21) and is arranged so as to run along the mid-axis of the device.
10. Device (20) according to Claim 1, characterized in that a frame holder (26) of the device is smaller in the radial direction than the associated adjustable roll (21) in the radial direction, i.e. is smaller than the diameter of the roll (21).
11. Device (20) according to Claim 10, characterized in that, in the radial direction, the frame holder (26) of the device is constructed as a housing and accommodates the pressure chambers (36; 53).
12. Device (20) according to Claim 1, characterized in that resultant forces from adjacent pressure chambers (36; 53) are arranged approximately at right angles to one another.
13. Device (20) according to Claim 1, characterized in that the actuator (34; 50) can be adjusted remotely from a control station and/or can be adjusted individually on the device (20).

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