DE10244046B4 - Device for adjusting the contact pressure of an adjustably mounted roller - Google Patents

Abstract

contraption for adjusting the contact pressure between an adjustably mounted first roller (21) and at least one second roller (22) and / or for turning on or off the first roller (21) to the second roller (22) in a printing press, with several acted upon by pressure medium Actuators (34; 50), wherein an actuator (34; 50) drives the first roller (21) with an adjustable force in the direction of the second roller (22) suppressed, wherein the pressure of the pressure medium is changeable and the pressure medium by means of a switching device (59) on different actuators (34; 50) connectable characterized in that two valves (62, 63) for adjusting the Pressure of the pressure medium are provided, with which two different contact pressures two actuators (34; 50) are adjustable on an adjustable roller (21), wherein by switching the switching device (59), the two Valves (62; 63) optionally to the actuators (34; 50) differently adjustable Rolls (21a, 21b, 21c, 21d, 21e) are connectable.

Description

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

In usual Printing machines, such as web-fed rotary printing presses, There are a variety of rollers available. In particular, ink rollers provided for the transfer of the Color from a color memory to serve the plate cylinder. By the ink rollers can be dosed to the color transferred to the plate cylinder, so that transfer the color as a uniform film of a certain thickness becomes. disorders, such as speed variations and torsional vibrations can be compensated thereby.

In addition, in the printing machine also dampening rollers are provided, which are a fountain solution, For example, transfer water to the printing unit.

Become frequent Roller pairs formed by meshing rollers, in which at least one of the rollers has a cylindrical surface made of elastic Material has, so that this cylindrical surface depending on the contact pressure of the opposite Roller at least slightly can be deformed. The result is given by the elastic Deformation of the roll surface a contact region extending in a straight line between the rollers, which is referred to as a contact strip. The width of the contact strip can by creating the contact pressure between the rollers be varied, the width of the contract strip a considerable Has an influence on the print result. For example, in one Inking of the contact strips too narrow, so not enough color is transferred, whereas in cases in which the contact strip is too wide, the elastic roller can be damaged by the occurring flexing work.

Around in particular the strip width in each case depending on the operating conditions, For example, the temperature of the printing press or their degree of wear, always be able to adjust correctly it is necessary to store the one roller adjustable, so They use an actuator with an adjustable force in the direction of opposite Roller pressed can be. Is then the right contact pressure between the two Found rollers, a fixing device for fixing the first Roller pressed relative to the second roller to the contact pressure permanently to maintain.

From the DE 197 19 305 A1 a device for adjusting the contact pressure between two rollers is 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 A1 a device for semi-automatic setting of rolls is known, in which the adjustably mounted roller 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 roll holder on the frame holder locking bolts are provided by the delivery of the roll holder can be frictionally clamped to the frame holder.

The DE 38 08 142 A1 describes a device for storing two cylinders. Here, the contact pressure between two on and Abstellbarer rolls by changing the pressure of the pressure medium is changeable. Also, a switching device is arranged, with which the pressure medium can be selectively guided to different actuators.

The DE-OS 16 11 303 discloses a device for turning on and off a printing cylinder of a gravure printing machine, wherein a pressure reducing valve is provided.

By the DE 100 01 582 A1 a device for adjusting the contact pressure between rollers in a printing machine is known in which two pressure control valves are used to drive the rollers.

Of the Invention is based on the object, a device for adjusting to provide the contact pressure of an adjustably mounted roller, with the device technology Effort is reduced.

The The object is achieved by the Characteristics of claim 1 solved.

at the devices is the actuator for adjusting the contact pressure in the manner of having a pressure medium, a biased gas, in particular Compressed air, acted upon pressure body formed. To adjustment the pressure of the pressure medium to change the contact pressure too can, valves are provided. Because of a dampening or inking unit Variety of adjustable rollers are provided, would be one the number of actuators corresponding number of valves normally necessary, which is a high equipment expense meant. This high effort is avoided by having a Switching device is provided with which the control valves either can be connected to different actuators. This means with other words, that the adjustable rollers are no longer all can be set simultaneously, but only the Actuators actuated are over the switching device are connected to the adjustment valves. Depending on the design of the inking or dampening but sufficient for adjustment of the entire inking or dampening system few valves, with which successively adjusted the contact pressure of the various adjustable rollers becomes.

To a preferred embodiment only two valves provided with which then the same time Pressure adjustable by two actuators on an adjustable roller is. To adjust the different adjustable rollers is then so proceeded that in each case an adjustable roller by pressing the both valves is adjusted and after the adjustment by pressing the fixing device the setting is fixed. After fixation can then with the Setting the next adjustable Roller be continued.

To The method is the angular position of the second roller on which the first roller is pressed with adjustable contact pressure, detected. By controlling this angular position, it is possible that the pressing or adjusting the adjustable roller then only in certain angular positions of the second roller is performed.

These Type of control of the pressure is particularly important in cylinders, at the periphery of fasteners are provided for fixing the printing plates. Will namely the Adjustment or adjustment of the adjustable rollers straight in one Angular position made in which the adjustable roller on the fastening device of the Form cylinder comes to the plant, the set values are through the changed one Diameter in the area of the fastening device falsified. These adulteration can be excluded by controlling the angular position of the second roller.

To a further preferred embodiment follows the adjustment of the contact pressure and / or the employment the first roller to the second roller with simultaneous rotation the rollers.

embodiments The invention are illustrated in the drawings and are in following closer described.

It demonstrate:

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

2 the device shown schematically in cross section according to 1 in a basic position;

3 the device shown schematically in cross section according to 1 in a deflected position;

4 the device according to 1 in a perspective view from the front;

5 a second embodiment of an actuator for a device in cross section;

6 an inking unit with several adjustable rollers for employment on a forme cylinder;

7 a switching device for selectively switching two valves between different actuators.

In 1 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 its axis 23 or pin releasably attached to one of the device 20 provided quick release 24 be attached. Such quick-release fasteners are known from the prior art and have a semicircular bearing shell into which the ends of the axle 23 can be inserted. By attaching a in 1 not shown upper bearing shell can then the axis 23 on the quick release 24 be determined.

The device 20 is essentially a frame holder 26 and a roll holder 27 constructed, the relative to each other in a plane that extends perpendicular to the plane, against each other can be moved. The frame holder 26 is from a base plate 28 , which, for example, by means of a pivoting arm pivotally attached to the frame of a printing machine who that can, and a sleeve body 29 built up. On to the roller 21 facing side, the sleeve body 29 a recess 31 in which a cylindrical section 32 the roll holder 27 intervenes. The inner diameter of the recess 31 or the outer diameter of the section 32 is chosen so that a circular cylindrical gap in the basic position 33 forms with a gap width of about 1 mm to 10 mm, in particular of about 2 mm. Through the gap 33 is the maximum adjustment range for adjusting the roller holder 27 relative to the frame holder 26 Are defined.

To the when adjusting the roller 21 to be able to realize required positioning movements or the desired contact pressure between the roller 21 and the roller 22 to be able to apply are in the gap 33 a total of four distributed in the manner of pressure hoses over the circumference 34 trained actuators 34 of which in 1 only two are shown in section, arranged. About in 1 not shown supply lines 48 (please refer 4 ) can be from the wall of the actuators 34 formed pressure chambers 36 be pressurized. Depending on the respective pressure conditions in the four actuators 34 acts on the roll holder 27 a resulting force, so by appropriate control of the pressure in the actuators 34 the roller 21 with the desired contact pressure against the roller 22 can be pressed. Because that's in the actors 34 pressurized air cushion is compressible, mechanical disturbances can be intercepted by the resulting spring effect.

For fixing the roller holder 27 relative to the frame holder 26 are on the roll holder 27 Plate elements 37 attached to the sleeve body 29 attached lamella elements 38 are arranged combing to form a Lammellenpakets. For frictional obstruction of the Lammellenelementen 37 and 38 formed Lammellenpakets 37 respectively. 38 is a T-shaped stamp in cross section 39 provided, the circular punch head 40 with a circular flange 41 at the extreme Lammellenelement 37 respectively. 38 the Lammellenpakets comes to the plant. At the opposite end of the stamp 39 is a printing plate 42 attached to the spring force of one in the manner of a plate spring package 43 formed spring element 43 acts. The spring element 43 is biased between the pressure plate 42 and the sleeve body 29 mounted, so that of the Lammellenelementen 37 and 38 formed lamb package by the spring force coming from the stamp 39 on the Lammellenelemente 37 and 38 is being transmitted.

For adjustment of the roll holder 27 relative to the frame holder 26 , Especially when adjusting the contact pressure between the rollers 21 and 22 must be the one from the Lammellenelementen 37 and 38 or the stamp 39 and the printing plate 42 formed fixing device can be solved. This is in the base plate 28 a pressure connection 44 provided by a pressure chamber 46 between the pressure plate 42 and the base plate 28 can be acted upon with a pressure medium, for example compressed air. Once the on the printing plate 42 acting air pressure the spring force of the spring element 43 exceeds, the stamp becomes 39 so far from the outermost Lammellenelement 37 respectively. 38 lifted off that they are no longer frictionally jammed and can be relatively shifted against each other.

The adjustment of the contact pressure between the rollers 21 and 22 takes place, for example, in the following manner. First, the pressure chamber 46 applied with a sufficient pressure, so that the Lammellenelemente 37 and 38 no longer be frictionally jammed. Subsequently, the actuators 34 each applied with just enough pressure that the desired contact pressure between the rollers 21 and 22 or between the roller 21 and further, in 1 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 and 22 is found, the pressure chamber 46 depressurizes, causing the punch 39 the lamb cell elements 37 and 38 clamped together so that the roll holder 27 relative to the frame holder 26 is fixed in the desired position. Last will be the actors 34 pressure emptied.

In 2 and 3 is the working principle of the device 20 shown in the required adjusting movement in a schematic manner. 2 shows the frame holder 26 with the recess 31 and the intervening section 32 the roll holder 27 , By choosing the dimensions is between the frame holder 26 and the section 32 the roll holder 27 A gap 33 formed in which the in 2 and 3 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 represented by a place level, which is in the representation of 2 and 3 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 3 exemplified, the roll holder 27 and as a result, the roller attached thereto 21 relative to the frame holder 26 be offset laterally, which by a corresponding control of the actuators 34 and the consequent force on the section 32 causes becomes. Once the desired position of the roll holder 27 relative to the frame holder 26 can be found, that of the Lammellenelementen 37 and 38 or the stamp 39 and the printing plate 42 formed fixing device are actuated so that the position is permanently fixed and the actuators 34 do not need to be driven further.

In 4 is the device 20 with base plate 28 shown in a perspective view from the front. The sleeve body 29 is by means of four fastening screws 47 at the base plate 28 attached (see 1 , shown schematically). Between the sleeve body 29 of the frame holder 26 and the roll holder 27 , on the front-facing side of the shell-shaped quick release 24 partially recognizable (see 1 ), the four are in the style of pressure hoses 34 trained actors 34 arranged over supply lines 48 can be acted upon with compressed air. By means of the pressure plate 42 can the recognizable Lammellenelemente 37 and 38 to be relaxed.

One recognizes the extremely compact design of the device 20 , due to their overall rotationally symmetrical design (apart from the base plate 28 ) has a smaller diameter than the roller 21 yourself (see 1 ).

5 shows a second embodiment of an actuator 50 for a device 20 in cross section. The basic structure of the device 20 with frame holder 26 , Roll holder 27 and a fixing device for fixing the roll holder 27 relative to the roll holder 26 corresponds with the 1 described structure and therefore need not be explained further. To form the actuator 50 gets in the gap 33 a cylindrical membrane 51 , whose upper and lower edges with the inner diameter of the sleeve body 29 is connected (in 5 not shown) arranged. The membrane 51 in addition, in four strip-shaped areas 52 with the inner diameter of the sleeve body 29 connected, for example glued, so as a result through the sleeve body 29 and the membrane 51 four pressure chambers 53 are formed, evenly over the circumference of the gap 33 are distributed. The pressure chambers 53 can each have pressure inlet openings 54 be pressurized with compressed air, so depending on the pressure in the four pressure chambers 53 a resultant force on the section 32 the roll holder 27 acts.

In 6 is an inking unit 56 shown with that of a roller 57 Printing ink on one in the manner of a forme cylinder 22a trained roller 22a can be transferred. To transfer the ink are in the inking unit 56 five adjustable rollers 21a ; 21b ; 21c ; 21d ; 21e intended. The ends of the adjustable rollers 21a to 21e are each in devices 20 stored what is in 6 through the appropriate actuators 34 is indicated.

By pressurizing the corresponding actuators 34 can the rollers 21a ; 21c ; 21e to the roller 22a be employed. After employment of the rollers 21a ; 21c ; 21e can by pressurizing the various actuators 34 on the rollers 21a to 21e the contact pressure between the different rollers 57 ; 21a to 21e ; 22a be set.

At the roller 22a is one or more fasteners 58 or interruptions 58 provided, in particular in the manner of a gap 58 is trained. In the fastening device 58 For example, the leading and trailing edges of a printing plate can be fixed to the printing plate on the roller 22a to fix. The angle of rotation of the roller 22a is detected by a sensor, not shown, and forwarded to the controller. When hiring the rollers 21a ; 21c ; 21e or in the adjustment of the contact pressure of these rollers 21a ; 21c ; 21e becomes the respective angle of rotation of the roller 22a considered, thereby preventing the rollers 21a ; 21c ; 21e when hiring or when adjusting the contact pressure at the interruption 58 issue. The adjustment of the rollers 21a to 21e or their employment to the roller 22a can also be used with a rotating printing unit with rotating roller 22a respectively. The adjustment of the contact pressure and / or the employment of the first rolls 21a to 21e to the second roller 22a occurs at low speeds, in particular at 3,000 to 5,000 U / h.

In the 7 illustrated switching device 59 is suitable for controlling the total 20 Actuators on the adjustable rollers 21a to 21e on one side. The switching device 59 is shown only schematically and will be explained briefly below.

From an accumulator 61 For example, a pressure medium, for example compressed air, can be taken off with a sufficiently high pressure level. About two valves 62 ; 63 , in particular pressure control valves 62 ; 63 the pressure medium flows into two separate pressure chambers 64 ; 66 in which depends on the position of the pressure control valves 62 and 63 a corresponding pressure level prevails. About every actor 34 assigned pressure lines 67 can the in the pressure chambers 64 respectively. 66 set pressure to the actuators 34 be transmitted.

The conversion of the changeover device 59 is clocked. The duration of a timer to set an adjustable roller 21a to 21e of the inking unit 56 or dampening unit is 0.1 to 2 seconds, in particular 0.5 seconds.

In the switching device 59 are now in 7 not shown shut-off devices, such as shut-off valves provided so that optionally different of the pressure chambers 64 and 66 connected pressure lines 67 can be shut off. Now is the contact pressure on an adjustable roller 21 be set, then all pressure lines 67 locked off to actors 34 lead, which are not necessary for the adjustment. As a result, it follows that through the pressure control valves 62 ; 63 adjusted air pressure only to the actuators 34 be transferred to the setting of the respective desired roller 21 involved. After adjusting this roller 21 the corresponding contact pressure is fixed by actuation of the fixing device, so that by switching the switching device 59 then the next adjustable roller 21 can be adjusted.

01 until 19

20

contraption

21

roller

22

roller

23

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

Lamellar element ( 27 )

38

Lamellar element ( 26 )

39

stamp

40

ram head

41

Flange ( 40 )

42

printing plate

43

Spring element, Belleville spring assembly

44

pressure connection

45

46

pressure chamber

47

fixing screw

48

supply

49

50

actuator

51

membrane

52

attachment section

53

pressure chamber

54

Pressure inlet port

55

56

inking

57

roller

58

Fastening device, Interruption, gap

59

switchover

60

61

accumulator

62

Valve, Pressure control valve

63

Valve, Pressure control valve

64

pressure chamber

65

66

pressure chamber

67

pressure line

21a

roller

21b

roller

21c

roller

21d

roller

21e

roller

22a

Roller, form cylinder

Claims (19)

Device for adjusting the contact pressure between an adjustably mounted first roller ( 21 ) and at least one second roller ( 22 ) and / or for turning on or off the first roller ( 21 ) to the second roller ( 22 ) in a printing press, with a plurality of acted upon with pressure medium actuators ( 34 ; 50 ), where an actuator ( 34 ; 50 ) the first roller ( 21 ) with an adjustable force in the direction of the second roller ( 22 ), wherein the pressure of the pressure medium is variable and the pressure medium by means of a switching device ( 59 ) on different actuators ( 34 ; 50 ), characterized in that two valves ( 62 ; 63 ) are provided for adjusting the pressure of the pressure medium, with which two different contact pressures of two actuators ( 34 ; 50 ) on an adjustable roller ( 21 ) are adjustable, whereby by switching the switching device ( 59 ) the two valves ( 62 ; 63 ) optionally to the actuators ( 34 ; 50 ) of different adjustable rollers ( 21a ; 21b ; 21c ; 21d ; 21e ) are connectable. Device according to claim 1, characterized in that the valve ( 62 ; 63 ) as a flow control valve ( 62 ; 63 ) is trained. Apparatus according to claim 1, characterized in that on an inking unit ( 56 ) or dampening unit several devices ( 20 ), wherein the adjustment of the contact pressure between two rollers ( 21 ; 22 ) of the inking unit ( 56 ) or dampening units by switching the switching device ( 59 ) on the actuators ( 34 ; 50 ) a correspondingly assigned adjustable roller ( 21a ; 21b ; 21c ; 21d ; 21e ) and subsequent actuation of the valves ( 62 ; 63 ) he follows. Apparatus according to claim 1, characterized in that the conversion of Umschaltein direction ( 59 ) and the actuation of the valves ( 62 ; 63 ) one after the other to adjust all adjustable rollers ( 21a ; 21b ; 21c ; 21d ; 21e ) of the inking unit ( 56 ) or dampening works is feasible. Apparatus according to claim 1 or 4, characterized in that the conversion of the switching device ( 59 ) is clocked. Apparatus according to claim 5, characterized in that the duration of a time clock for setting an adjustable roller ( 21a . 21b . 21c . 21d . 21e ) of the inking unit ( 56 ) or dampening units 0 . 1 to 2 Seconds, in particular 0.5 seconds. Device according to claim 1, characterized in that a fixing device ( 37 . 38 . 39 . 40 . 42 . 43 ) for fixing the first roller ( 21 ) relative to the second roller ( 22 ) is arranged. Device according to claim 1, characterized in that the first roller ( 21 ) in a roll holder ( 27 ), which in turn is adjustable on a frame holder ( 26 ), wherein the roll holder ( 27 ) a section ( 32 ), which in such a way with a recess ( 31 ) in the frame holder ( 26 ) is engaged that between the recess ( 31 ) and the section ( 32 ) at least one gap ( 33 ), in which the actuator ( 34 ; 50 ) is arranged, or conversely that the recess in the frame holder ( 26 ) and the intervening section ( 32 ) on the roll holder ( 27 ) is provided. Apparatus according to claim 8, characterized in that the recess ( 31 ) and the intervening section ( 32 ) on the roll holder ( 27 ) or frame holder ( 26 ) are each formed rotationally symmetrical and in between a circumferential gap ( 33 ) is formed. Apparatus according to claim 9, characterized in that the recess ( 31 ) and the intervening section ( 32 ) on the roll holder ( 27 ) or frame holder ( 26 ) each substantially coaxially along the longitudinal axis of the first roller ( 21 ). Device according to claim 10, characterized in that the gap ( 33 ) between roll holder ( 27 ) and frame holder ( 26 ) with coaxial alignment of roll holder ( 27 ) and frame holder ( 26 ) has a circumferential width of about 1 mm to 10 mm, in particular of about 2 mm. Device according to one of claims 1 to 11, characterized in that the largest outer diameter of the roll holder ( 27 ) or frame holder ( 26 ) is at least slightly smaller than the outer diameter of the first roller ( 21 ). Device according to one of claims 1 to 12, characterized in that at least three, in particular four, actuators ( 34 ; 50 ) are arranged, which the first roller ( 21 ) in different directions. Device according to one of claims 1 to 13, characterized in that as a pressure medium a prestressed gas, in particular compressed air, is used. Device according to one of claims 1 to 14, characterized in that the actuator ( 34 ) in the manner of a pressure hose ( 34 ) whose wall is formed to form a pressure chamber ( 36 ) in the gap ( 33 ) between roll holder ( 27 ) and frame holder ( 26 ) is arranged. Device according to one of claims 1 to 15, characterized in that four pressure hoses ( 34 ) each with the same distance from each other over the circumference of the gap ( 33 ) between roll holder ( 27 ) and frame holder ( 26 ) are arranged distributed. Device according to one of claims 1 to 16, characterized in that the actuator ( 50 ) together from a pressure-resistant membrane ( 51 ) in the gap ( 33 ) on the component wall of the roll holder ( 27 ) is applied, and the component wall of the frame holder ( 26 ) is formed by the fact that the component wall of the frame holder ( 26 ) and the membrane ( 51 ) forming at least one pressure chamber ( 53 ) in fixing sections ( 52 ) pressure-tightly connected to each other, for example glued, are, wherein in the component wall of the frame holder ( 26 ) at least one pressure inlet opening ( 54 ) is provided, or conversely that the pressure chamber ( 53 ) from the membrane ( 51 ) and the component wall of the frame holder ( 26 ) is formed. Apparatus according to claim 1, characterized in that the actuation of the actuators ( 34 ; 50 ) is clocked. Apparatus according to claim 18, characterized in that the duration of a time clock for setting an adjustable roller ( 21a . 21b . 21c . 21d . 21e ) of the inking unit ( 56 ) or dampening unit 0.1 to 2 seconds, in particular 0.5 seconds.