EP1707361B1 - Applicator roller for an offset printing group - Google Patents

Description

The invention relates to an applicator roll for an offset printing unit, having an axis and a roll shell rotatable about the axis, wherein the axis rotationally fixed in the offset printing unit can be fixed, in particular in a printing machine for the production of labels.

Printing presses for the production of labels may have a number of interfaces or platforms for accommodating printing process-specific devices, so that a processing of a printing material, in particular a printing material web, can be carried out with different, depending on the order printing method. With one of the platform associated counter-pressure cylinder over which the path of the printing material passes through the printing press, a recorded printing process-specific device in cooperation forms a printing unit of the corresponding printing process. Typical printing-specific devices, often in the form of essays, trays, inserts or cassettes, include flexographic printing, screen printing, letterpress printing and offset printing. Likewise, machining-process-specific devices which can likewise be accommodated on the platforms are made available, so that, for example, embossing of foil (hot and cold), gluing, punching or the like can take place on the printing substrate. The mentioned printing units can also be designed to be variable in format insofar as different cylinder diameters, in particular for the respective printing form cylinder, can be used. A format adaptation requires variable positioning of individual components or components in the printing process specific device.

In offset printing units, especially in variable format execution, the positions of the applicator rollers, those rollers which are in rolling contact with the printing form, must be set exactly. For various reasons, for example by roller wear, by temperature effects or by dimensional tolerances, a fine adjustment or readjustment during operation may be necessary.

Typical application rollers are designed without drive and are caused by the frictional contact of the lateral surface with the lateral surface of a standing in Wälzkontakt other driven roller of the inking unit or ink fountain, in particular an iridescent Verreiberwalze, in rotational motion. The contact pressure consequently influences the force transmission and also the color transfer or color splitting in the nip of the contacting rollers. Also, the axial force of an iridescent Verreiberwalze can be used to oscillate the applicator roll in the axial direction.

From the document DE 196 31 176 C1 a roller in a inking or dampening unit for a rotary printing machine is known, which has a rotatably mounted in two bearing points pin rotatably mounted roll barrel. The axis of rotation of the roll bale with respect to the longitudinal axis of the pins is adjustable, in particular eccentrically pivotable. The adjustment can be made by means of a worm driven by a wheel or by a gear, which is in engagement with a rack.

Furthermore, in the document FR 2527988 discloses an applicator roll with a frame fixed recorded axis. The contact pressure of the roll mantle, which is received rotatably about the axis, against the mantle surface of an oscillating distributor roll can be adjusted by means of two eccentric pieces. The eccentric pieces are rotatable in the released state about the axis, so that the force effect can be changed with the adjustment of the angular position. For fixing the eccentric pieces in a certain angular position screws which cause a clamping on the axis are provided.

In the document DE 199 61 190 A1 is a self-adjusting and adjusting storage for rollers of an inking unit or a dampening unit of a printing press described. About an eccentric bearing a roll body with a roll cover is supported by an axle. By acting on an eccentric bearing ring elastic Component with flat spring characteristic can be achieved a constant contact pressure even with manufacturing tolerances.

Furthermore, in the document US 3,732,814 discloses a provided with Schmitzringen blanket cylinder in an offset printing unit, so that pressure or distance to a counter-pressure cylinder are adjustable. The bearer rings of the blanket cylinder are mounted on bearings and in eccentric bushes.

Due to the temporal change in the properties of the roll shell material, it is often difficult to set a defined contact pressure and a correspondingly well-defined color transport reproducible.

Object of the present invention is to provide an applicator roll, which allows a simple way positioning of the applicator roll in the printing unit.

This object is achieved by an applicator roll with the features of claim 1. Advantageous developments of the invention are characterized in the dependent claims.

An applicator roll according to the invention for an offset printing unit, has an axis, in particular a continuous shaft or two roll neck with a common longitudinal axis, and a roll shell rotatable about the axis, wherein the axis rotationally fixed or fixed to the frame in the offset printing unit is fixed, more precisely, the roll neck of the applicator roll can be fixed on , The application roller comprises at least one bush, which carries a bearing and a rotatable around one of the two roll neck bearer and its angular position on the axis is variable such that the bearer ring race is eccentric to the axis adjustable. In other words, the applicator roll comprises an eccentric to the axis adjustable socket, an eccentric bushing.

Under the term of the application roller used in this illustration, in particular inking rollers, fountain solution application rollers and applicator rollers, which apply both color and fountain solution, to understand. In particular, there are application rollers for transferring a fluid (the color and / or the dampening solution) on a printing form cylinder. A priori, applicator rolls in an offset printing unit that is in steady-state operation carry both ink and fountain solution, albeit in different integral amounts. A concrete term used by one skilled in the art with one of the fluids found in the offset printing works describes the primary purpose of the applicator roll.

The application roller according to the invention is particularly pronounced without drive. The roll neck can also be carried out separately.

The power transmission to the applicator roll and a defined employment of the applicator roll to be brought into Wälzkontakt another roller of the inking unit, the ink fountain or the fluid work carried by the race whose tread can roll on that of a race of the other roller. Such a race can also be referred to as a bearer ring.

In an advantageous embodiment, the sleeve of the applicator roll, which is detached from the axis, in particular the roll neck, is axially adjustable and can be fixed on the axis, in particular the roll neck. Advantageously, thus the amplitude of the transverse stroke (the traversing movement) of the applicator roll can be adjusted by the distance of the sleeve is changed to a support disk on the axis. In other words, the transverse stroke of the applicator roll can be limited. The transverse stroke or the oscillation in the direction of the axis is induced by the action of an oscillating rolling contact roller. Advantageously, the adjustment functions of the eccentricity and the oscillation amplitude can be united in this embodiment of the applicator roll according to the invention.

In a preferred embodiment, the eccentric to the axis position of the bushing of the applicator roll by means of a first and a second threaded pin which are einenkbar in respective bores of the bush and both on each lying in the socket surface, in particular flat surface, the axis, in particular of the roll neck , act, adjustable. The change in position of the tips of the setscrews causes relative tilting of the surface relative to a normal position of the surface (in which the sleeve is concentric with or without eccentricity with the axis), in other words causes rotation of the sleeve about a pivot axis relative to said axis such that the eccentricity is varied. The surfaces may also be part surfaces of a large area of the roll neck. The setscrews can also be screws.

In this way, a very simple reproducibility of the setting is advantageously achieved by two points of action of the end faces or tips of the setscrews on the surfaces, since the number and partial angle of the signed revolutions The setscrews are precisely related to the action on the axle: The difference in rotation between the two setscrews is a measure of the eccentricity of the bushing. By alternately loosening and tightening the two setscrews, the number of revolutions and part revolutions is counted, the sleeve or the eccentric can be adjusted controlled.

At the applicator roll according to the invention, the adjustment is easily possible, since the bushings of the races in the installed state of the applicator roll, especially when it interacts with the printing form cylinder, conveniently, in particular from the outside, is accessible. In the case of offset printing units, which are equipped with printing forme cylinder and blanket cylinder in inserts, cassettes or the like, they no longer need to be removed prior to adjustment. A possible loss of time due to possibly iterative optimization of the multiple setting is avoided. Good reproducibility of the settings is achieved.

In an advantageous development, the bushing of the applicator roll according to the invention can have at least one first and one second bore for receiving a respective cylindrical pin, which serves as a stop for one of the threaded pins.

Furthermore, an applicator roll according to the invention can also have on the other roll neck an eccentrically adjustable axis to the bush, which carries another bearing for a further race. The applicator roll can therefore be equipped with two eccentric bushes. Each of the two eccentric bushings can have the described inventive features.

In an advantageous embodiment, the bearing for a race of the applicator roll is a deep groove ball bearing Alternatively, or further, the roll shell of the applicator roll on at least one other bearing, in particular a needle roller bearing, is rotatably received on the axis.

In the context of the inventive idea is also the use or the use of an inventive application roller in an offset printing unit. In other words, an offset printing unit according to the invention with a printing form cylinder and a number of applicator rollers which can be set against the printing form cylinder has at least one application roller with features or combinations of features according to this illustration. In other words, at least one of the applicator rolls, preferably all but one or all of the applicator rolls, of the offset printing unit is an applicator roll having features or feature combinations as illustrated in this description.

In particular, the applicator roll according to the invention can be used in an offset printing unit whose printing form cylinder and transfer cylinder are releasably connectable stored in the offset printing unit, so that cylinders with different diameters in the offset printing unit can be accommodated. In other words, the offset printing unit according to the invention with at least one application roller according to the invention can be a format-variable offset printing unit.

An offset printing unit according to the invention may preferably have three or four application rollers, of which two and in this case three application rollers have features according to the invention in that case. In each case one of the applicator rollers can also be designed without eccentric adjustability.

Moreover, in the context of the inventive idea is also a printing machine, in particular a label printing machine or a self-adhesive label printing machine. The printing machine may be a sheet-processing or web-processing printing press. Preferably, the printing press is modular. The printing press may in particular be designed such that a variable arrangement of pressure-specific devices is possible, as has been outlined in the introduction to the description of this representation. Typical variable printing presses, in particular for label printing, are known from the prior art: for example, embodiments of such printing presses are in the documents US 4,384,522 . WO87 / 04665 . EP 0 757 627 B1 and EP 0 687 559 A1 described. The use of the applicator roll according to the invention is to be seen in particular in connection with these machines or machine configurations.

A printing press according to the invention for processing printing substrate webs, in particular for producing labels or self-adhesive labels, comprises at least one platform for receiving printing process-specific devices and a counter-pressure cylinder assigned to the platform over which the printing material web runs, such that a recorded printing process-specific device cooperates with the impression cylinder Compressor forms the corresponding printing method, wherein one of the printing process-specific means comprises at least one applicator roll having features according to this representation, so that in the printing machine, an inventive offset printing unit is realized with the features described.

Figur 1

eine Ansicht einer Ausführungsform einer erfindungsgemäßen Auftragswalze mit zwei exzentrisch verstellbaren Laufringen,

Figur 2

eine Ansicht entlang der Achse der Ausführungsform aus Figur 1,

Figur 3

einen Schnitt längs der Achse der Ausführungsform aus Figur 1,

Figur 4

eine schematische Darstellung der Grundstellung des Exzenters, und

Figur 5

eine Winkelposition des Exzenters, bei dem eine Exzentrizität verschieden von Null eingestellt ist.

Further advantages and advantageous embodiments and developments of the invention will be described with reference to the following figures and their descriptions. It shows in detail:

FIG. 1

a view of an embodiment of an applicator roll according to the invention with two eccentrically adjustable races,

FIG. 2

a view along the axis of the embodiment of FIG. 1 .

FIG. 3

a section along the axis of the embodiment of FIG. 1 .

FIG. 4

a schematic representation of the basic position of the eccentric, and

FIG. 5

an angular position of the eccentric in which an eccentricity is set to be different from zero.

The FIG. 1 shows a view of an embodiment of an applicator roller 10 according to the invention with two eccentrically adjustable races 16, 18. The applicator roll 10 has a about its axis (see also FIG. 3 ) rotatable roller casing 14, which consists of an elastic material and the fluid transfer (ink dampening solution) on a standing in rolling contact with the applicator roll 10, not shown here printing forme cylinder used in an offset printing unit. The exact amount of elasticity, ie, the material with a certain modulus of elasticity to be used, is known to those skilled in the art. The materials used in the roll shells of several applicator rolls in an offset printing unit can have different elasticities. The race 16 and the further race 18 are each on a bushing 40, also referred to as an eccentric, added to the roll pin 20. The axis of the applicator roll 10 is fixed to the frame by means of a fastening screw 26, ie rotationally fixed in the construction of the offset printing unit, such as in the frame, on the frame or on the side wall fixed. The applicator roll 10 is on both sides, that is, both shaft journals are recorded in the offset printing unit. To adjust the angular position of the bushings 40, the setscrews, here in FIG. 1 is to see at the respective sleeve 40 of the first threaded pin 22, dissolved and tightened after rotation of the sleeve 40 with the associated race 16, 18 again, so that the screws are fixed to the bushing 40 on the roll neck 20.

The FIG. 2 is a view along the axis of the embodiment of FIG. 1 , In this illustration, the effect of a rotation or adjustment of the angular position of the sleeve 40 with the recorded race 16 and the previously drawn fastening screw 26 is clear: The roll neck 20 with the pivot axis 66 of the axis of symmetry 28 of the sleeve 40 carried by the bearing, on the rotatable part of the race 16 is fixed to a maximum eccentricity 30 spaced. In the basic position (see also FIG. 4 ) the symmetry axis 28 coincides with the axis of the roll mantle 14. Upon rotation of the bush 40, the axis of symmetry 28 is pivoted out of the plane III about the pivot axis 66, so that the length of the solder of the symmetry axis 28 (the intersection of the axis of symmetry 28th with the plane of the drawing) to the level III, in which the axis of the roll shell 14 is located, the set eccentricity of the eccentric represents.

The FIG. 3 shows a section along the axis 12 of the embodiment FIG. 1 (Level III in FIG. 2 ). In this embodiment, the applicator roll 10 has a continuous eccentric shaft 32 with axis 12, which by means of a fastening screw 26, as already with reference to the preceding Figures 1 and 2 described, rotatably recorded in non-illustrated offset printing unit. The one in the left part of the FIG. 3 shown shaft journal 20 carries a rotatable about the pivot axis 66 bushing 40, on which a bearing 34, here a deep groove ball bearing, is received, which is secured with a locking ring 38. The rotatable part of this bearing 38 carries the race 16, the tread 36 can cooperate with a tread of another roller. The other, in the right part of the FIG. 3 shown shaft journal carries another race 18 with the same structure just described. Between eccentric shaft 32 and roll shell following the respective sleeve 40 is a sleeve 42 which is separated by a circular seal 44 of a support plate 46. The roll shell 14 is axially movable relative to the sleeves 42, the circular seals 44 and the support discs 46 and rotatably supported on the eccentric shaft by needle bearings 48 which are separated by a space with grease 50. While in the left part of the FIG. 3 the needle bearing 48 is shown at the stop of the support plate 46 is in the right part of the FIG. 3 a space between needle roller bearing and support disc recognizable. If, as already mentioned, the applicator roller is in rolling contact with an iridescent distributor roller of the fluid movement of the offset printing unit, it is transmitted to the applicator roller 10 not only a rotational action but also an oscillation effect in the direction of the axis 12. The amplitude of the oscillating movement of the applicator roll is limited by the spacing of the support disks 46. In other words, the possible transverse stroke 52 is determined by the adjustable axial position of the support disks 46 FIG. 3 Thus, the distance between the needle ball bearing shown in the right part of the support disk, the maximum transverse stroke 52 of the traversing movement. The bushes 40 are detachably connected to the eccentric shaft 32 and its axial position can be adjusted, ie the axial Position of the support disk 46 can be changed with the sleeve 40, so that the possible transverse stroke 52 is adjustable.

For a more detailed explanation of the operation of the sleeve 40, this is described with reference to a section: In the FIG. 4 is a schematic representation of the basic position of the eccentric in the intersection of the level IV of FIG. 3 shown when the end faces of the setscrews 22, 24 (locking screws) are flush with the holes in the socket. The bush 40 has a first cylindrical pin 54 in a first bore 56 and a second cylindrical pin 60 in a second bore 62, wherein the holes 56, 60 extend into the holes of the threaded pins 22,24. The end faces of the set screws 22, 24 are in contact with the roll neck 20, more specifically the end face of the first set screw 22 contacts a first face 62 and the end face of the second set screw 24 contacts a second face 64 of the roll neck. A clamping and associated fixation of the beech 40 on the shaft journal is effected. The end surfaces of the threaded pins 22, 24 act on these surfaces 62, 64 such that the position of the threaded pins 22,24 in the holes determines the angular position of the sleeve 40 relative to the roll neck 20. The grub screws can be loosened so that the beech 40 can be rotated about the pivot axis 66 of the shaft journal 20 from a first angular position and brought into a second angular position and can be fixed therein again. The roll neck 20 is designed such that in the gap formed with the sleeve 40 there is sufficient play for a rotation in both directions of rotation. For this purpose, 20 material is removed from the generally cylindrical body of the roll neck, so that it has a prismatic shape in the vicinity of the threaded pins 22, 24. The surfaces 62, 64 do not intersect the circular arc of the cylindrical body at right angles, but are slightly inclined to the end face of the threaded pins 22, 24 executed in the basic position. The surfaces of the prismatic shape and the surfaces 62, 64 each grind a right angle.

The adjustment of the angular position of the sleeve 40 has the following effect: The FIG. 5 refers schematically to an angular position of the eccentric in the section of the plane V of the FIG. 3 in which an eccentricity of the other race 18 is set differently from zero. The sleeve 40 is exemplified by 10 degrees from the in FIG. 4 shown basic position has been rotated clockwise about the pivot axis 66, while the first set screw 22 is sunk below the surface of the beech 40 and the second set screw 24 protrudes beyond the surface of the sleeve 40 addition. In this situation shown, the operation of the first cylindrical pin 54 in the first bore 56 as a movable stop for the first set screw 22, the end face is now applied to the first cylindrical pin 54, can be seen. The mobility of the stopper is required due to the relative rotation to the roll neck 20. It is immediately clear to the person skilled in the art that after a rotation of about 10 degrees from the in FIG. 4 shown in the other direction of rotation (counterclockwise) in an analogous situation for the second cylinder pin 58 in the second bore 60 results. A clamping of the sleeve 40 in the rotated angular position is further achieved by the action of the end faces of the set screws 22, 24 on the surfaces 62, 64 of the roll neck 20. On the in FIG. 5 As shown, an eccentric deflection of the other race 18 is made: The axis of symmetry 28 of the bearing is pivoted so that an eccentricity 30, as already in the context of FIG. 2 described, the axis 12 of the applicator roller 10 is effected. The symmetry axis 28 no longer coincides with the axis 12, but is eccentric to the axis 12th

LIST OF REFERENCE NUMBERS

10 applicator roll 12 axis 14 roll shell 16 Schmitz ring 18 another race 20 roll neck 22 first grub screw 24 second grub screw 26 fixing screw 28 Symmetry axis of the bearing 30 maximum eccentricity 32 eccentric shaft 34 live storage 36 tread 38 circlip 40 Rifle 42 shell 44 round seal 46 support disc 48 Needle Bearings 50 fat stock 52 adjustable transverse stroke 54 first cylinder pin 56 first hole 58 second cylinder pin 60 second hole 62 first surface 64 second surface 66 swivel axis

Claims (10)

1. Applicator roller (10) for an offset printing unit including an axis (12) with roller journals (20) and a roller jacket (14) rotatable about the axis (12), the axis (12) being fixable against rotation by receiving the roller journals (20) in the offset printing unit,
   characterized in
   that the applicator roller (10) comprises at least one bushing (40) which carries a sleeve bearing (34) and a bearer ring (16) rotatable about one of the two roller journals (20) and whose angular position on the axis (12) is variable in such a way that the bearer ring (16) is eccentrically adjustable relative to the axis (12).
2. Applicator roller (10) according to Claim 1,
   characterized in
   that released from the axis (12), the bushing (40) is axially adjustable.
3. Applicator roller (10) according to Claim 1 or 2,
   characterized in
   that by means of a first and a second threaded pin (22, 24), which are is introducible into a respective bore of the bushing (40) and act on a respective axis (12) surface (62, 64) located in the bushing (40), the eccentric position of the bushing (40) relative to the axis (12) is adjustable.
4. Applicator roller (10) according to Claim 3,
   characterized in
   that the bushing (40) includes at least a first and a second bore (56, 60) for receiving a respective cylinder pin (54, 58) acting as a stop for a respective one of the threaded pins (22,24).
5. Applicator roller (10) according to one of the preceding claims,
   characterized in
   that on the other roller journal (20), the applicator roller (10) also includes a bushing (40) that is eccentrically adjustable relative to the axis (12) and carries a further sleeve bearing (34) for a further bearer ring (18).
6. Applicator roller (10) according to one of the preceding claims,
   characterized in
   that the sleeve bearing (34) for the bearer ring (16) is a grooved ball bearing.
7. Applicator roller (10) according to one of the preceding claims,
   characterized in
   that the roller jacket (14) is rotatably received on the axis (12) on at least one further sleeve bearing (48).
8. Offset printing unit including a printing forme cylinder and a number of applicator rollers (10) engageable with the printing forme cylinder,
   characterized in
   that at least one of the applicator rollers is an applicator roller (10) according to one of the preceding claims.
9. Offset printing unit according to Claim 8,
   characterized in
   that the printing forme cylinder and a transfer cylinder are releasably and connectibly supported in the offset printing unit so that cylinders of different diameters are receivable.
10. Printing press for treating webs of printing material, in particular for producing labels, including at least one platform for receiving printing-process-specific devices and an impression cylinder guiding the web of printing material and associated with the platform in such a way that a received printing-process-specific device in cooperation with the impression cylinder forms a printing unit for the corresponding printing process,
    characterized in
    that the printing-process-specific device includes at least one applicator roller (10) according to one of the preceding claims 1 to 7, so that an offset printing unit according to claim 8 or 9 is implemented in the printing press.

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