EP1437221A2 - Device 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 adjustable stored roller according to the preamble of claim 1.

In conventional printing presses, such as web-fed rotary printing presses, there are a variety of rollers. In particular, ink rollers are provided serve the transfer of the color from a color memory to the plate cylinder. By the ink rollers can meter the ink transferred to the plate cylinder, so that the color is transferred as a uniform film of a certain thickness. Disorders like for example, speed fluctuations and torsional vibrations be balanced.

In addition, dampening rollers can also be provided in the printing press a dampening solution, for example water, is transferred to the printing unit.

Frequently, roller pairs are formed by mutually engaging rollers, at which at least one of the rollers has a cylindrical surface made of elastic material, so that this cylinder surface depends on the contact pressure of the opposite roller can be deformed at least slightly. The result is the elastic Deformation of the roll surface is a straight line extending between the rolls Contact area called a contact strip. The width of the contact strip can be varied by creating the contact pressure between the rollers, the width of the contract strip has a significant influence on the printing result Has. If, for example, the contact strip is too narrow in an inking unit, it will not transfer enough color, whereas in cases where the contact strip is too wide is, the elastic roller can be damaged by the resulting flexing work.

In particular, depending on the operating conditions, the strip width for example the temperature of the printing presses or theirs Degree of wear, to be able to always set correctly, it is necessary to use one roller adjustable adjustable so that it can be moved with an actuator with an adjustable force the opposite roller can be pressed. Then is the right contact pressure found between the two rollers, a fixing device for fixing the first roller operated relative to the second roller to maintain the contact pressure permanently to obtain.

DE 197 19 305 A 1 is a generic device for adjusting the Contact pressure between two rollers known. The one described there Bearing arrangement is the adjustable roller with a spring, which is on the frame the printing press supports, pressed against the opposite roller. Thereby depending on the selected spring characteristic always a certain one Contact pressure between the two rollers. To fix the roller in the pressed position is a clamping mechanism with clamping lever and clamping plate described by which the roller axis by friction on the frame of Printing machine is fixable.

DE 199 19 733 A 1 describes a device for the semi-automatic setting of Rolls known in which the adjustable roller is held in a roller holder is, which in turn is mounted on a frame holder arranged fixed to the frame. Roller holder and frame holder can be moved against each other and are connected to each other by resilient means. The resilient means have a certain pre-tension, so that the roller holder is adjustable mounted roller with a certain contact pressure against the opposite Roller can be pressed. To lock the roller holder on the frame holder Locking bolt provided, by the delivery of the roller holder on the Frame holder can be clamped.

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

The DD 64 064 describes a device for clamping bearing bushings from Pressure cylinders. There is no information about setting rollers.

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

The invention has for its object a device for adjusting the To create contact pressure of an adjustable roller.

The object is achieved by the features of claim 1.

An advantage of the fixing device is in particular that such a device Fixing device is extremely compact and thus space-saving. This is achieved in that the adjustable components are fixed relative to one another several slat elements are frictionally clamped. By the arrangement several, in particular a multitude, of such lamella elements one behind the other the friction force required for fixing on a variety of friction surfaces between the Slat elements distributed. By oppressing the one behind the other Lamellar elements have the opposite clamping force in all friction surfaces.

Suitable plate elements are known for example from plate clutches, which are used for the frictional connection of rotatably mounted axes. in the Difference to the known multi-plate clutches are in the fixing device Slats can be moved against each other in at least one direction and can depending on the play between the components of the fixing device within one certain adjustment range against each other and then fixed. The actuating movement therefore does not take place like a multi-plate clutch Swiveling or rotating movement takes place, but takes place in the manner of a Translational movement in the plane caused by the alignment of the friction surfaces of the Slat elements is defined.

In principle, all elements or constructions can be used as the clamping device with which the lamellae are applied with sufficient Contact pressure can be clamped together. 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 is from the prestressed spring element such high spring force is exerted on the lamellar elements that they are reliable are frictionally fixed to each other. An unwanted loosening of the fixing device, for example in the event of a power failure, as is the case with others This eliminates the risk of a clamping device. To the To be able to solve the clamping device for adjusting the components of the fixing device in this embodiment to provide an adjusting element on the fixing device with which the spring element can be compressed so far that the lamella elements can be relaxed and thereby shifted against each other.

In principle, any drive devices, For example, electrical, hydraulic or pneumatic systems are used become. It when the adjusting element in the manner of a stamp is particularly advantageous is formed, which is slidably arranged in a pressure chamber. By Actuation of the pressure chamber with a pressure medium, for example compressed air or hydraulic fluid, the stamp can against the spring force of the spring element are shifted so that the lamella elements are relaxed as a result.

The advantages that can be achieved with the invention are, in particular, the very compact Construction that is made possible by the proposed construction. As from the Known in the art, the roller is attached to a roller holder which is in turn slidably mounted on a frame holder. The frame holder in turn can either be fixed to the frame of the printing press, or alternatively, be arranged on corresponding actuating devices that for example, starting or stopping the ones stored in the roller holder Serve roller relative to the opposite roller.

A recess is provided on the roller holder or on the frame holder, into which a Section of the frame holder or the roller holder engages. The dimensions of the Section or the recess are chosen so that between the Recess and the section forms a gap through which the adjustment range between Roller holder and frame holder is defined. Within this gap the Roller holder can be moved relative to the frame holder. To the for the To be able to apply the necessary positioning forces, or around the first roller press against the opposite roller with a certain contact pressure can, at least one actuator is arranged in the gap, which has a pull and / or Exerts pressure 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 roller holder extremely compact designs can be realized. It is of course, regardless of whether the recess on the frame holder or roller holder is provided so that in principle both designs are alternatively conceivable.

The shape of the recess and the section engaging therein is fundamental any and can be adapted to the respective application. So it is conceivable that the recess is rectangular and play in only one direction compared to the section engaging therein, so that as a result the Roller holder can only be adjusted in one direction. In contrast, becomes a Adjustment of the roller holder in different directions is desired, for example because the roller stored in the roller holder has to be adjusted to several rollers it is particularly advantageous if the recess and section are each rotationally symmetrical are formed so that a circumferential gap is formed between them. This can achieved that the roller holder in one level in different Adjustment directions can be adjusted relative to the frame holder, the adjustment range the actuating movement is limited by the width of the circumferential gap.

Can the roller holder move relative to the frame holder in different directions, For example, in an entire level, are adjusted to apply the required actuation movement required several actuators. According to a preferred Embodiment are therefore in the gap between the roller holder and frame holder arranged at least three actuators with which the first roller each in different Directions can be pressed. By appropriate choice of the respective Forces applied to actuators can be achieved by combined control of the various Actuators a resulting force in any direction on the roller holder and thus be applied to the roller stored in the roller holder. Preferably the Actuators distributed in a star shape in the gap between the roller holder and frame holder arranged. If four actuators are located opposite each other in the gap arranged, this can reliably preclude tilting of the actuators be, because by driving an actuator the opposite actuator is squeezed.

The type of actuators is basically arbitrary. So are of course, electrical or piezoelectric systems are also conceivable. It is particularly advantageous if the actuator is designed in the manner of a pressure body, which can be loaded with a pressure medium. A hydraulic oil becomes the pressure medium used, can therefore very high pressures with correspondingly large actuating forces be applied.

According to a preferred embodiment, a prestressed gas, especially compressed air used. Since gases are fundamentally compressible, the result is by using a prestressed gas as a pressure medium, an elastic one Cushioning that acts between the frame holder and roller holder. Through this cushioning can cause mechanical malfunctions caused, for example, by unbalance or out of roundness can be caused to be balanced. Most also says Printing machines Compressed air is already available as an energy transmission medium.

The device for adjusting the contact pressure between the adjustable Roller and an opposite roller can of course also be used for this be, the adjustable roller on the other roller on or remedy. However, this requires the adjustment range between the frame holder and Roll holders must be chosen large enough to be the ones required for parking To be able to perform the actuating movement. In addition, the actuator must be between the frame holder and roller holder chosen to carry out such an actuating movement suitable become. To start or stop regardless of the actuation of the To be able to perform device, it is advantageous if the device on a additional storage device is attached. This parking device can for example be designed in the manner of a swivel arm with which the frame holder relative to Frame of the printing press between an on position and an off position can be pivoted.

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

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

Embodiments of the invention are shown in the drawings and are in following described in more detail.

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 device in cross section;

Fig. 2

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

Fig. 3

the device shown schematically in cross section according to Figure 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 of Figure 2 in a perspective view from the front.

Fig. 6

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

The fixing device 01 shown in Fig. 1 has a part, for. B. a base body 02, which is formed from a cover 03 and a sleeve 04, and one in the sleeve 04 slidably mounted part, e.g. B. a bolt 06, on the outside of a Mounting plate 07 is provided on. The base body 02 can for example be attached to a frame, whereas on the mounting plate 07, for example a roller lock for storing a roller can be screwed on.

The bolt 06 has a certain clearance radially to the sleeve 04, so that the bolt 06 relative to the base body 02 in a plane that is perpendicular to the plane of the drawing extends, can be moved in any direction 08. This allows the Mounting plate 07, for example in the direction of the movement arrow 08 upwards or moved below. Because of the circular symmetry Formation of the fixing device 01 can also be used in any desired positioning movements other directions within the position level can be realized. On the base body 02 are in Equidistant distances between lamella elements 09 on the inside of the sleeve 04 attached that mesh with lamella elements 11 attached to the bolt 06. The Contact surfaces between the lamella elements 09; 11 extend in Levels that run parallel to the level of the possible positioning movements. During the Adjustment of the bolt 06 relative to the base body 02 slide the slat elements 09 along the slat elements 11, the actuating movement through the game between pin 06 and base body 02 is limited.

A clamping device is used to fix the fixing device 01 in a specific position 12 with a pressure stamp 15, which is displaceably mounted in a pressure cylinder 16, intended. Through the connection 13, a pressure chamber 14 with a Pressure medium, for example a hydraulic oil or compressed air, so that the pressure stamp 15 in the pressure cylinder 16 in the direction of the lamella elements 09 or 11 is pressed. The result is the lamella elements 09; 11 between the clamping device 12 and one molded onto the sleeve 04 End stop 17 clamped. As soon as the surface pressure between the pressure stamp 15 and the foremost slat member 11 exceeds a certain pressure the individual slat elements 09; 11 with the formation of a static friction state frictionally to each other to the system, so that the bolt 06 relative to the base body 02 is fixed.

In Fig. 2 is a device 20 for adjusting the contact pressure between a first Roller 21 and a second roller 22 shown. The roller 21 can with the ends of their Axis 23 releasably on a quick-release fastener 24 provided on device 20 be attached. Such quick fasteners 24 are from the prior art known and have a semicircular bearing shell, in which the ends of the Roller axis 23 can be inserted. By attaching one in Fig. 2 not shown upper bearing shell can then the roller axis 23 on the quick release 24 to be determined.

The device 20 is essentially composed of a frame holder 26 and a Roller holder 27 built up relative to each other in a plane that is perpendicular extends to the drawing plane, can be shifted against each other. The Frame holder 26 is made of a base plate 28, for example by means of a Swivel arm can be pivotally attached to the frame of a printing press, and a sleeve body 29 is constructed. 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 inside diameter of the recess 31 respectively the outer diameter of section 32 is selected such that a Basic position of circular cylindrical gap 33 with a gap width of approx. 1 mm to 10 mm, in particular of 2 mm. Through the gap 33, the maximum adjustment range Adjustment of the roller holder 27 relative to the frame holder 26 defined.

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

In the device 20 is a height h36 of the pressure chamber 36 in the radial direction Roller 21 smaller than a width b36 of the pressure chamber 36 in the axial direction of the roller 21 and / or a length 136 of the pressure chamber 36 in the circumferential direction of the roller 21 (see also Fig. 5).

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

To fix the roller holder 27 relative to the frame holder 26 are on the roller holder 27 lamella elements 37 fastened with the fastened to the sleeve body 29 Slat elements 38 are arranged in a combing manner to form a slat packet are. For frictional clamping of the lamella elements 37 and 38 formed lamella packet, a punch 39 with a T-shaped cross section is provided, whose circular stamp head 40 with an annular flange 41 on outermost slat element 38 of the slat pack comes to rest. At the opposite end of the stamp 39, a pressure plate 42 is attached to which the Spring force of a spring element 43 designed in the manner of a plate spring assembly acts. The spring element 43 is biased between the pressure plate 42 and the Mounted sleeve body 29 so that the lamella elements 37; 38 educated Slat pack by the spring force that from the punch 39 to the slat elements 37; 38 is transmitted, is stuck.

To adjust 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 Slat elements 37; 38 or the stamp 39 and the pressure plate 42 formed fixing device can be solved. For this is in the base plate 28 Pressure connection 44 is provided through which a pressure chamber 46 between the Pressure plate 42 and the base plate 28 with a pressure medium, for example compressed air can be applied. As soon as the air pressure acting on the pressure plate 42 Exceeding the spring force of the spring element 43, the punch 39 is as far from the extreme Slat element 38 is lifted off so that they are no longer clamped by friction and can be shifted relative to each other.

The setting of the contact pressure between the rollers 21; 22 takes place, for example, in following way. First, the pressure chamber 46 is of sufficient pressure acted on so that the lamella elements 37; 38 no longer clamped become. Subsequently, the actuators 34 each have just that much pressure acts that the desired contact pressure between the rollers 21; 22 or between the roller 21 and other, not shown in Fig. 2 Rolls forms and leads to a contact strip of the desired width. As soon as the correct setting with the desired contact pressure between the rollers 21; 22 is found, the pressure chamber 46 is depressurized, whereby the stamp 39 die Slat elements 37; 38 clamped together, so that the roller holder 27 relative to the frame holder 26 is fixed in the desired position. Finally, the actuators 34 depressurized.

3 and 4, the principle of operation of the device 20 is in the required actuating movement represented in a schematic manner. Fig. 3 shows the frame holder 26 with the Recess 31 and the portion 32 of the roller holder 27 engaging therein the choice of dimensions is between frame holder 26 and section 32 of the roller holder 27, a gap 33 is formed, in which the only in FIGS. 3 and 4 Actuators 34 indicated schematically by force arrows are arranged. The possible Adjustment movements between the frame holder 26 and the roller holder 27 are by a level, which is in the representation of Fig. 3 and Fig. 4 in the Drawing plane extends, defined, the range of the actuating movements by the Width of the gap 33 is limited.

As exemplified in Fig. 4, the roller holder 27 and thus the result attached roller 21 are laterally offset relative to the frame holder 26 what by a corresponding control of the actuators 34 and the resulting ones Force effect on the section 32 is effected. As soon as the desired position of the Roller holder 27 is found relative to the frame holder 26, the of the Slat elements 37; 38 or the stamp 39 and the pressure plate 42 formed fixing device are operated so that the position is permanently fixed and the actuators 34 no longer need to be driven.

5 shows the device 20 with the base plate 28, the frame holder 26, the roller 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 roller holder 27, on the forward side of which the half-shell-shaped quick-release fastener 24 is partially recognizable, the four actuators 34 designed in the manner of pressure hoses are arranged, which can be acted upon by compressed air via feed lines 48. The non-recognizable lamella elements 37; 38 be relaxed.
One recognizes the extremely compact design of the device 20, which due to its overall rotationally symmetrical design (apart from the base plate 28) has a smaller diameter than the roller 21 itself (see FIG. 2).

6 shows a second embodiment 50 of an actuator 50 for a device 20 in the Cross-section. The basic structure of the device 20 with the frame holder 26, Roller holder 27 and a fixing device for fixing the roller holder 27 relatively to the roller holder 26 corresponds to the structure described with FIG. 2 and must therefore not explained further. To form the actuator 50, a cylindrical membrane 51, the upper and lower edge with the inner diameter of the sleeve body 29 is connected (not shown in FIG. 6). The Membrane 51 is also in four strip-shaped areas 52 with the Inner diameter of the sleeve body 29 connected, for example glued, so that as a result of the sleeve body 29 and the membrane 51 four pressure chambers 53 are formed, which are evenly distributed over the circumference of the gap 33. The Pressure chambers 53 can each have compressed air through pressure inlet openings 54 are applied, so that depending on the respective pressure in the four pressure chambers 53 a resulting force acts on the section 32 of the roller holder 27.

Here too, a height h53 of the pressure chamber 53 of the device (20) is 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 153 of the pressure chamber 53 in the circumferential direction of the roller 21.

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, especially 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

Movement arrow, adjusting device

09

Slat element (02)

10

-

11

Slat element (06)

12

clamper

13

port opening

14

Pressure chamber (12)

15

Printing stamp (12)

16

Impression cylinder (12)

17

end stop

18

-

19

-

20

contraption

21

Roller, first

22

Roller, second

23

Axis, roller 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

Slat element (27)

38

Slat element (26)

39

stamp

40

ram head

41

Flange (40)

42

printing plate

43

spring element

44

pressure connection

45

-

46

pressure chamber

47

fixing screw

48

supply

49

-

50

actuator

51

membrane

52

Fastening section, area

53

pressure chamber

54

Pressure inlet port

b36

Width (36)

h36

Height (36)

l36

Length (36)

h53

Height (53)

l53

Length (53)

Claims (18)

Device (20) for adjusting a roller (21) with at least one actuator (34; 50) and a fixing device (01), characterized in that the fixing device (01) the lamella elements (09; 11) fixing the roller (21) in the radial direction ) and that friction surfaces of the lamella elements (09; 11) are arranged substantially perpendicular to the axis of rotation of the roller (21). Device (20) according to claim 1, characterized in that the fixing device (01) extends in the device coaxially to the longitudinal axis of the first roller (21) and is arranged running along the central axis of the device. Device (20) according to claim 1, characterized in that the actuator (34; 50) has at least one pressure chamber (36) which can be pressurized with pressure medium. Device (20) according to claim 3, characterized in that a height (h36; h53) of the pressure chamber (36; 53) in the radial direction of the roller (21) is smaller than a width (b36) of the pressure chamber (36; 53) in axial direction of the roller (21) and / or a length (l36; l53) of the pressure chamber (36; 53) in the circumferential direction of the roller (21). Device (20) according to claim 3, characterized in that at least two pressure chambers can be actuated independently of one another. Device (20) according to claim 1, characterized in that the roller (21) is arranged in a roller holder (27) and this roller holder (27) is mounted on a frame holder (26) and this pressure chamber (36) in a gap (33) is arranged between roller holder (27) and frame holder (26). Device (20) according to claim 3, characterized in that a ratio of the width (b36) and / or length (l36; l53) of the pressure chamber (36; 53) to the height (h36; h53) of the pressure chamber (36; 53) is greater than 3. Device (20) according to claim 3, characterized in that a plurality of pressure chambers (36; 53) acting in different directions are arranged in the circumferential direction of the roller (21). Device (20) according to claim 3, characterized in that at least three pressure chambers are arranged in the circumferential direction. Device (20) according to claim 3, characterized in that four pressure chambers are arranged in the circumferential direction. Device (20) according to claim 1, characterized in that the adjustable roller (21) is designed as an ink roller or dampening roller of a printing press. Device (20) according to claim 1, characterized in that the actuator (34; 50) turns the adjustable roller (21) on and off on an opposite roller (22). Device (20) according to claim 1, characterized in that a frame holder (16) of the device in the radial direction is smaller than the associated adjustable roller (21) in the radial direction, ie smaller than the diameter of the roller (21). Device (20) according to claim 5 or 8, characterized in that in the radial direction the frame holder (16) of the device is designed as a housing and accommodates the pressure chambers (36; 53). Device (20) according to claim 5 or 8, characterized in that the device (20) has a roller holder (27) and a frame holder (16) and that the pressure chambers (36; 53) in a gap (33) between the roller holder (27 ) and frame holder (16) are arranged. Device (20) according to claim 5 or 8, characterized in that the resulting forces of adjacent pressure chambers (36; 53) are arranged approximately at right angles to one another. Device (20) according to claim 5 or 8, characterized in that the actuators (34; 50) are arranged in a star shape. Device (20) according to claim 1, characterized in that the actuator (34; 50) is remotely adjustable from a control station and / or individually adjustable on the device (20).

Images