EP1369369A1 - Fluid-assisted fan-out compensator - Google Patents

Abstract

The device has a rotation body structure with alternating foot and head sections forming a corrugated surface to deform the printing path enclosing the rotation body structure in a corrugated manner transversely to a direction of motion. Fluid channels in the rotation body structure open on its surface. The rotation body structure has a fluid connection to carry pressure fluid to the channels and through them to the surface of the structure. The device has a rotation body structure (6) with alternating foot (7) and head (8) sections along a rotation axis (D) forming a corrugated surface (9,10) to deform the printing path (W) that encloses the rotation body structure in a corrugated manner transversely to a direction of motion. Fluid channels (15) formed in the rotation body structure open on its surface and the rotation body structure has a fluid connection (13,14;11) connected to the channels to carry pressure fluid to the channels and through them to the surface of the rotation body structure. AN Independent claim is also included for the following: (a) a method of compensating fan-out in a printing machine.

Description

The invention relates to the compensation of the FanOut by influencing the width a web that is printed in the printing press. In this case, the invention relates Both a FanOut compensator and a method for compensating the FanOut. The FanOut compensator can already be installed in the printing press or, still outside the printing press, for installation for the purpose of FanOut compensation be provided. The printing press is one Machine that prints wet, preferably using a dampening solution. Of the Offset printing should be mentioned here as an example. In particular, the Printing press a newspaper printing machine for printing large newspaper editions his. The web is preferably passed endlessly through the machine and from a Roll unwound, i. the printing press is such a design Web-fed printing press and more preferably a web-fed rotary printing press.

In printing machines occur due to liquid penetrated into the web Transverse strain changes. This phenomenon known as FanOut has to unwelcome consequence that measured across the web conveying direction width of the Web between two printing nips, in which the web is printed one after the other, changes. The phenomenon of fan-out can basically only by the However, the FanOut is practically significant especially in the pressure working with dampening solution because of the associated Moistening the web. The moistened in the upstream printing nip web swells up their way and will be up to the next, downstream pressure nip of the two Pressure column wider. If measures for a compensation of the width change not be taken, this leads to printing errors in the web transverse direction.

From EP 1 101 721 A1 are devices for compensating the FanOut for the Web-fed rotary printing with which the web is transverse to its conveying direction is deformed wave-shaped before moving into a subsequent pressure nip in which they is printed, enters. The width of the web is the width change, due to the FanOut is expected to be adjusted in advance, i. compensated. The The invention also relates in particular to FanOut compensators, as described in EP 1 102 721 A1 are known and also relates in particular to the executable therewith Method of FanOut compensation.

It is an object of the invention to improve FanOut compensation. In particular, the FanOut compensation should not negatively affect the printing process influence.

The invention relates to the FanOut compensation in a printing press with the aid of a FanOut compensator, which includes a rotating body formed from one to is wrapped around the printing web. The wrap angle should be at least 3 ° be. However, a wrap angle of 5 ° or more, for example 10 °, becomes prefers. The wrap angle can be up to 180 °. The train will due to the looping and the web longitudinal tension acting in the conveying direction of the rotational body structure transversely to the conveying direction embossed a wave profile. The width of the web is determined by the impressing of the wave profile corresponding to Amplitude of the wave profile is reduced to those caused by the FanOut Compensate for the increase in width. The course should be as close as possible in the two closest to the FanOut compensator in the path of the web Pressure columns, i. in the pressure gaps between which the FanOut compensator is arranged, each have the same width.

According to the invention, between the surface of the rotary body structure and the Web generates a fluid gap, so that the web as small a contact surface and preferably has no direct contact with the rotating body at all, but according to the thickness of the fluid gap from the surface of the Rotationskörpergebildes is spaced. Due to the invention are thus due to the FanOut compensation minimizes frictional forces acting on the web and the Longitudinal web tension between the pressure gaps advantageously far less than at changed the fan-out compensators from the prior art. If the the Rotational body-facing bottom of the web is printed with ink, Furthermore, the danger is reduced, ideally eliminated, from the bottom of the Web ink can be transferred to the rotary body structure.

A fanout compensator according to the invention comprises a rotational body structure which along its longitudinal axis side by side alternately foot sections and head sections having a wave-shaped surface to the web to be printed across to undulate to the web conveying direction. The foot sections form the Wave troughs and the head sections the wave crests of a wave profile. In that Rotational body formations are fluid channels formed on the surface of the Rotationskörpergebildes open. The rotary body structure further comprises at least a fluid port connected to the fluid port through which the fluid channels can be supplied with a pressurized fluid. The over the fluid connection in the Fluid channels introduced pressurized fluid is from the fluid channels to the wavy Surface of the Rotationskörpergebildes performed and occurs at the mouth points at the Surface under pressure, leaving between the surface and the bottom of the Path forms a fluid cushion in the form of said fluid gap.

The pressurized fluid is preferably a pressurized gas. Compressed air is particularly preferred.

The mouth points of the fluid channels can over the surface of the rotating body evenly distributed in the axial direction and evenly distributed in the circumferential direction his. However, the density of the mouth sites per unit area of the surface can be at preferably uniform distribution in the circumferential direction in the axial direction periodically vary with the period of the head and foot sections. So can the Areal density of the estuaries in the formed by the head sections Surface sections are denser than in the formed by the foot sections Surface sections to axial flows from the head sections in the Compensate for foot sections.

The fluid channels may be formed as bores and extending from their mouths at the surface through the head portions and / or foot portions of the Rotationskörpergebildes therethrough radially inwardly into one or optionally extend a plurality of cavities through which they are connected to a fluid source or connectable. Such holes can in particular straight and unbranched be formed. Drilling can be drilled in the immediate sense or through another type of processing, for example by means of laser, can be obtained.

Each of the fluid channels may be separate from each of the other fluid channels and each form a single point of confluence. The fluid channels or a part of the fluid channels can but also branch out to the surface of the Rotationskörpergebildes and there ever form several mouth points. It can also be between the fluid channels Cross connections exist.

It also corresponds to a preferred embodiment, the head sections and / or the Foot sections of the rotary body structure with sufficient for the fluid line To provide porosity to obtain the fluid channels. The porosity is preferred an open porosity, allowing the interconnected pores of the porous material form the fluid channels. For the formation of porous head sections and / or Foot sections is particularly suitable for the original shaping by molding a powder, preferably a metal powder, with subsequent or simultaneous sintering of the Compact. If the foot sections and / or the head sections through fluid channels Form material porosity, can also subsequently incorporated holes so that the fluid channels in their entirety become a part of pore channels and too another part are holes.

The head sections and foot sections may be formed separately and alternately along the longitudinal axis be arranged side by side. So can the head sections and the Foot sections are formed, for example, by rollers which are about the longitudinal axis are rotatably mounted. It can also be the head sections about a common longitudinal axis and the foot sections also rotatably mounted about a common, other longitudinal axis be, wherein the two longitudinal axes in turn for an adjustment of the wave profile of Rotationskörpergebildes are relatively parallel to each other displaced, as this is described in particular in EP 1 101 721 A1. The head sections and the Foot sections would be in such training to a single, common hollow shaft or rotatably mounted about two mutually parallel hollow axes through which the fluid is stirred can be.

Not least because of the invention can be applied to a pivot bearing of the head and However foot sections are completely dispensed with in such Rotationskörpergebilden, whose acting on the web wave profile is not changeable. In particular it is not required that the rotary body structure is freely rotatable. The Rotational body formation in particular does not have to follow the path velocity.

A pivot bearing of the rotary body structure is still advantageous, namely the Adjusted wave profile formed by the surface of the rotary body structure can. A rotary motion of the rotary body formation finds particularity However, preferred Ausrührung held only for the purpose of adjustment, while the Rotational body then resting in the optimally set state, i. Not about its longitudinal axis turns. As far as an adjustable rotating body in the Although the longitudinal axis is referred to as the axis of rotation, this is true In principle, a rotation body freely rotatably mounted about the rotation axis However, what is meant primarily, however, is a rotating body structure intended only for Purpose of adjusting the surface profile formed by it about its axis of rotation is twisted.

In a first embodiment, the rotary body formation is a one-piece rotary body with a surface that is rotationally symmetrical along the longitudinal axis. The wave profile of this body of revolution can not be changed. Although this rotary body can be freely rotatably mounted about its longitudinal axis, it is preferably not rotatably mounted in a frame of the printing press. The term _{"body of} revolution" is in the case of non-rotatable mounting on the preferably round, particularly preferably rotationally symmetrical about the longitudinal axis surface of the rotating body.

In a preferred second embodiment, a rotational body which is the radial protruding head portions and the radially recessed foot portions alternately along the longitudinal axis next to each other also forms in one piece to the The longitudinal axis rotatably mounted to the formed by the head and foot sections Changing the wave profile. In the second embodiment, the features the one - piece and adjustability brought together by the between the Head sections and the foot sections existing radial height differences of minimum values, they along a first offset parallel to the axis of rotation Straight line, in the circumferential direction about the axis of rotation to maximum values increase. The maximum values have the radial height differences along one of the Rotary axis parallel offset second line. The first straight and the second Straight lines are preferably tangents to all head sections, if indeed all Head portions with respect to the axis of rotation have the same radial height. Is not this In the case, the two straight lines are the furthest at the tangents projecting head portion or the group of the most protruding Head sections. For the adjustment of the rotary body a rotary motion is sufficient the uniform rotation axis for the entire body of revolution.

Also, a rotary body according to the second embodiment is in the printing machine easy to assemble and can in the same way as other rotation body of the Printing machine, such as guide rollers, be rotatably mounted.

Although in the first and second embodiments preferably a single, integral rotating body the entire rotating body of the FanOut compensator should not be excluded that a few such Rotational body, for example, two or three rotating body or torsionally rigid connected head and foot sections, along a common longitudinal axis, in the second embodiment coincides with the axis of rotation, arranged side by side are.

The surface of the rotating body structure acting on the web is in Circumferential direction preferably rounded everywhere. For this purpose, the surface along the Longitudinal axis of the rotary body structure in particular form a circle everywhere. Preferably, the surface portions formed by the head portions are approximately in With respect to the longitudinal axis curved radially outwards and those of the foot sections formed surface sections around with respect to the longitudinal axis radially inward arched. This preferably applies everywhere over the circumference of the rotational body image. Furthermore, the head and foot sections on the surface should be soft in one another go over, i. be continuously differentiable at the transition points in the axial direction, by merging tangentially.

At a due to their ease of manufacture also preferred embodiment it is equivalent that the surface sections formed by head sections in Axial direction over part of their length or over their entire length are straight. The Transition points between the foot sections and the head sections formed surface sections should, however, in this embodiment on the The circumference of the rotating body smoothly merge into each other everywhere.

A rotational body of head sections and foot sections, the relative are not rotatable to each other and in preferred embodiments all or zu a part of one or a few bodies of revolution formed in one piece be, facilitates the supply of the surface with the pressurized fluid considerably. While at individually rotatably mounted head and foot sections for each of these head and Foot sections a separate fluid rotary connection must be created, is sufficient for the relatively non-rotatable head and foot sections a common Connection. Such a connection is preferably created by a hollow axle, on the relative to each other not rotatable head and foot sections are stored.

In the case of a non-adjustable Rotationskörpergebildes the head and Foot sections each formed separately and not rotatably mounted on the hollow shaft. Preferably, however, in this case the head and foot sections are in one Rotational body formed in one piece, inside a cavity, for example a central bore, of sufficient length, to the entire effective Surface of the rotating body to provide the fluid. In the particular preferred second embodiment in which the wave profile acting on the web of the rotary body structure is variable, a rotary body, all or forms part of the head and foot sections in one piece, on the hollow axle be rotatably mounted. The hollow axle can alternatively be replaced by a hollow shaft are, i. the body of revolution forms itself or the two journals for his Pivot bearing. The rotary bearing of the rotating body on a hollow shaft, which in the Frame of the printing machine itself is not rotatably mounted, however, is preferred. On Advantage of the pivot bearing on a hollow shaft is that thereby a fluid supply easier way to the circumferentially related part of the wavy Surface can be limited, which acts on the web.

As far as the subclaims further features or described above Characteristics will also be revealed in other contexts Subclaims referenced.

Fig. 1

einen Druckturm mit einem Rotationskörper nach der Erfindung,

Fig. 2

den Rotationskörper in einer ersten Ausführung in einer ersten Drehwinkelposition in einem Querschnitt,

Fig. 3

den Rotationskörper in einer zweiten Drehwinkelposition in einem Querschnitt,

Fig. 4

den Rotationskörper in einer Längsansicht und teilweisem Längsschnitt und in einem Querschnitt,

Fig. 5

den Rotationskörper in einem weiteren Querschnitt,

Fig. 6

einen Ausgangskörper, aus dem durch eine materialabnehmende Bearbeitung ein Rotationskörper in einer zweiten Ausführung gebildet wird,

Fig. 7-14

den Rotationskörper der zweiten Ausführung in unterschiedlichen Drehwinkellagen, und

Fig. 15

einen Rotationskörper in einer dritten, vereinfachten Ausführung in einer Längsansicht und teilweisem Längsschnitt.

The invention will be described below with reference to exemplary embodiments. The features disclosed in the exemplary embodiments form each individually and in each feature combination the subject matter of the claims advantageously. Show it:

Fig. 1

a printing tower with a rotary body according to the invention,

Fig. 2

the rotational body in a first embodiment in a first rotational angular position in a cross section,

Fig. 3

the rotational body in a second rotational angular position in a cross section,

Fig. 4

the rotational body in a longitudinal view and a partial longitudinal section and in a cross section,

Fig. 5

the rotary body in a further cross section,

Fig. 6

an output body, from which a rotational body in a second embodiment is formed by a material-removing machining,

Fig. 7-14

the rotational body of the second embodiment in different angular positions, and

Fig. 15

a rotary body in a third, simplified embodiment in a longitudinal view and a partial longitudinal section.

Fig. 1 shows a four-high tower with four printing units. The four printing units are in the Pressure tower arranged one above the other to two H-bridges. Each of the printing works includes two blanket cylinders and two plate cylinders, i. one plate cylinder each for one the blanket cylinder. The blanket cylinders form between them pressure column 1 to 4, promoted by a web W and the pressing blanket cylinders printed on both sides. Before the first printing unit in the conveying direction is a Infeed roller and behind the last printing unit in the conveying direction is an outlet roller arranged in a known manner, which may be formed as draw rollers to a to set certain web tension.

The web W is printed in wet offset. In this case, the web W absorbs moisture and swells. Without corrective measures, the transverse to the conveying direction of the web W would measured web width increase from printing nip to printing nip, and it would be in the printing columns 1 to 4 consecutively printed images in the transverse direction of the Web do not match, i. There would be registration errors in the transverse direction. This Phenomenon is known as "Fanout". The increase in width would be between the two H-bridges, i.e. between the pressure gaps 2 and 3, the largest, since there the way from Gap to gap is longer than between two pressure gaps of a bridge.

In order to prevent or at least reduce register errors in the transverse direction, the Web width on the path of the web W from the printing nip 2 to that shown in FIG Reduced print production immediately following printing nip 3. For this purpose is between the printing columns 2 and 3 arranged a fanout compensator. The fanout compensator comprises a rotating body 6, which also serves as a deflection roller can be used. The rotary body 6 is immediately in front of the printing nip third arranged and fulfilled in this arrangement at the same time the function of Straight guide for the web W, so that the web W without looping in the pressure nip 3 enters.

In Fig. 1 is also an alternative printing position indicated, in which the web W only passed through the two lower pressure gaps 1 and 2, while another web W 'guided over the rotary body 6 and after deflection in the next Pressure gap 3 just starts.

The rotary body 6 is cylindrical, but unlike a simple, smooth roller on a longitudinally corrugated surface. Wrap around and Web tension ensure that the web conforms to the surface wave pattern deformed the rotational body 6 and thereby the web width is reduced. For the Looping of the rotating body 6 provides a guide roller 5, over which the web W at an angle to the straight connecting line between the rotating body 6 and the next following pressure nip 3 is guided to the rotary body 6. In the alternative print production, in which the web W 'already at an angle to this straight Connecting line enters and the rotating body 6 in dual function as well Deflection roller is used, additional deflection are not required.

In Figures 2 and 3, the rotary body 6 in a first embodiment each in the same cross section, but shown in two extreme rotational angle positions. Fig. 4 shows the rotary body in a longitudinal view and partly in longitudinal section.

The rotary body 6 is rotatable about a longitudinal axis D in a frame of Printing press stored. The longitudinal axis D is therefore hereinafter referred to as. axis of rotation designated. The rotary body 6 is in one piece in a process of Urformung or forming, for example, forging in the die, formed and on the surface Finely worked, preferably only smoothly worked smoothly. The rotation body 6 in Whole with respect to the rotation axis D is not rotationally symmetrical.

As can be seen from the synopsis of FIGS. 2 to 4, the surface of the rotary body 6 forms a straight line T ₁ parallel to the axis of rotation D for a single value of a rotational angle running about the axis of rotation D. In all other angles of rotation, the surface has a waveform with a regularly rounded, sinusoidal wave contour in the axial direction. The axial sections of the rotary body 6, which form the wave troughs, are referred to below as foot sections 7 and the axial sections which form the wave crests are referred to below as head sections 8. Starting from the straight line T ₁ , the radial height difference H _{D of} the wave contour in circumferential direction about the axis of rotation D increases continuously in both directions of rotation up to a second straight line T ₂ . The straight lines T ₁ and T ₂ are diametrically opposite each other with respect to the rotation axis D, ie, the straight lines T ₁ and T ₂ extend in a plane with the rotation axis D. The radial height difference H _D is the amplitude of the wave contour. Along the second straight line T ₂ , the radial height differences H _{D are} 4 mm. These maximum height differences, which are the same in the embodiment, should be at least 2 and not more than 10 mm.

The straight lines T ₁ and T ₂ are tangents to the head sections 8, ie they touch the head sections 8 just in their vertices. They come from a head enveloping sections 8 enveloping, straight envelope cylinder. If the tangent T _{1 is} displaced in parallel on the surface of the enveloping cylinder, the height difference H _D , which is measured radially on the axis of rotation D between the vertices of the foot sections 7 and the crests of the head sections 8, increases continuously until the tangent T _{2 is} reached.

Also drawn in FIGS. 2 to 4 is a circular cylinder jacket surface N, behind the foot sections 7 protrude radially and over which the head sections 8 radially protrude. The cylindrical surface N divides the surface profile in each longitudinal section in the Foot sections 7 and the head sections 8.

The foot sections 7 form surface sections 9, and the head sections 8 form Surface sections 10. The surface sections 9 and 10 are in the axial direction and rounded in the circumferential direction, preferably continuously curved everywhere. they run in the cylinder surface N tangentially into each other, so that in the axial direction everywhere uniform waveform with continuous, i. continuously differentiable transitions between the surface portions 9 and 10 is obtained.

The surface of the rotating body 6 forms a circle throughout the axis of rotation D in cross section. In Fig. 3, the circle radius in the vertices of the foot portions 7 with r ₃ and in the vertices of the head portions 8 with r ₄ is designated. The central axes of these vertex circles, designated L ₇ and L ₈ , are eccentric with respect to the axis of rotation D, each with the eccentricity "e". The center axes L ₇ and L ₈ extend in the same plane as the rotation axis D. The center axes of the cross-sectional circles of the foot portions 7 and the central axes of the cross-sectional circles of the head portions 8 toward the rotational axis D approaching towards the neutral cylindrical surface N gradually and coincide at the transition points on the neutral cylindrical surface N with the axis of rotation D.

With respect to the neutral cylinder surface N and the radial height difference H _D , it should also be noted that along each of the neutral cylinder surface N parallel to the rotation axis D, the arcs formed by the surface portions 8 are the same length as the arcs formed by the surface portions 10. These arcs of the surface sections 8 and 9 are particularly preferably the same if the arcs of the surface sections 8 are folded onto the side of the respective straight line of the cylindrical surface N on which the arcs of the surface sections 10 run. This is the case in the exemplary embodiment. The tangent T ₁ , along which the radial height difference H _{D has} the value "0", extends in the neutral cylinder jacket surface N. As a result, a mean web path does not change when the rotary body 6 makes a rotational adjustment movement about the stationary rotation axis D, for example from the rotational angular position of minimum ripple shown in FIG. 2 into the rotational angular position of maximum ripple shown in FIG. The middle path of the web W runs in each rotational angular position of the rotating body 6 on the neutral cylindrical surface N, which is for this reason referred to as "neutral".

The rotary body 6 is a hollow body with a along its entire length extending, central, circular cylindrical bore 11. Extending through the bore a non-rotatably mounted on the machine frame hollow shaft 12. Der Rotary body 6 is rotatably mounted on the hollow shaft 12 about the rotation axis D. The fixed support of the hollow shaft 12 is designated in Fig. 4 with 16. The Adjusting rotational movement of the rotating body 6 relative to the hollow shaft 12 is motor causes by means of an electric motor 17, the over a declining Gear transmission 18 rotatably drives the rotating body 6. The motor 17 is the actuator a controller 19, the actuator 17 for the adjustment of the rotary body. 6 controls, for example, as described in EP 1 101 721 A1, in this respect in Reference is made.

The rotary body 6 is used only for the purpose of adjustment, i. to change its acting on the web W surface contour, drehverstellt. By the way, he will locked in the current print production via the gear 18 of the actuator 17.

In the hollow shaft 12, a central, axial bore 13 is continuously formed, the to serves to supply the rotary body 6 compressed air. Furthermore, the hollow axle has a Longitudinal opening 14. The rotary body 6 is provided with fluid channels 15, which are extend radially through the annular shell of the rotating body 6. Each of the fluid channels 15 is formed as a straight through hole, extending into the bore of the 11th formed inner cavity and on the outer surface of the shell Rotating body 6, i. on its surface, opens. The fluid channels 15 are in Circumferentially distributed around the rotation axis D of the rotating body 6 arranged. You can, for example, with the help of a laser in the ring of the Rotary body 6 are incorporated. The fluid channels 15 are also along the Rotary axis D arranged evenly distributed.

The fluid channels 15 are connected via the hollow shaft 12 with a compressed air source. The Compressed air is introduced into the bore 13 of the hollow shaft 12 and passes over the Longitudinal opening 14 in the bore 11 and the fluid channels 15. The longitudinal opening 14th extends over a length sufficient, the fluid channels 15 over the entire axial Supply the length of the wave contour evenly with the compressed air. The longitudinal opening 14 is widened from the bore 13 to the outer shell surface of the hollow shaft 12 and covers in the circumferential direction more of the fluid channels 15. It opens and spreads towards the bottom of the looping web W. The compressed air thus passes through the bore 13 and the longitudinal opening 14 directly radially under the fluid channels 15, which are covered by the web W. A between the hollow shaft 12 and the Shell inner surface of the rotating body 6 formed annular gap preferably forms a Sealing gap to keep compressed air leakage as low as possible.

In Fig. 2 are due to the selected cross-sectional plane fluid channels 15 only in the Foot section 7 drawn the relevant cross section. Of course they are Fluid channels 15 in particular formed in the head portions 8, as shown in the Cross-section through the apex of a head portion 8 in Fig. 5 can be seen.

FIGS. 7 to 14 each show a rotary body 6 of a second one Embodiment, by machining from a about its longitudinal axis rotationally symmetrical output body 6 ', Figure 6 shows, was obtained. The Figures 7 to 14 each show a view of an end face of this rotating body 6 and a view on its long side. Starting from Figure 7, the figures show the Rotation body 6 in a sequence of rotational angular positions, in which the rotating body 6 each in a step of 30 ° from the first position shown in FIG. 7 to that in FIG. 14 shown position is rotated by 180 °. In FIGS. 10 and 11, the angular position is shown but the same.

Fig. 6 shows a rotationally symmetrical with respect to the axis of rotation D output body 6 ', from which the adjustable rotary body 6 of the second embodiment was made. The output body 6 'has along its axis of symmetry S everywhere the same, regular wave contour on its surface. He can, for example obtained by compression molding and sintering. Likewise he can from one circular cylindrical casting obtained by a material-removing machining become. By means of an exciting processing of the output body 6 'thereby be obtained that the previously smooth cylinder body with its axis of symmetry S clamped as a rotation axis in a lathe and a Drehmeisel the machine is axially moved along a template corresponding to the wave contour and thereby forming the waveform.

The output body 6 'thus obtained is rotatably clamped in a subsequent operation about a parallel to the axis of symmetry S processing axis B rotatably. The axis of symmetry S is the central axis L ₇ through the vertex circles of the foot sections 7, and the machining axis B is the central axis L ₈ through the vertex circles of the head sections 8. The machining axis B therefore has the eccentricity "2e" with respect to the axis of symmetry S of the output body 6 '. Subsequently, the output body 6 'is driven in rotation about the machining axis B. At the same time the Drehmeisel along the machining axis B is axially straight and moved radially to the machining axis B, so that after introduction of the bore 11 of the asymmetrical, adjustable rotary body 6 is obtained.

In Figure 6 is for the output body 6 'by way of example the division of its wave contour specified. The pitch is the distance between two measured in the axial direction adjacent vertices of the head portions 8 - and of course the same axial distance between two adjacent vertices of the foot sections 7. This distance or division is one quarter of the measured in the axial direction Width of a printing plate used in current print production. The wave contour of the rotating body 6, which was obtained from the starting body 6 'is Of course, also a quarter of the printing form width.

Due to the manufacturing process, the waveform of the rotating body 6 shown in FIGS. 7 to 14 results. The rotational body 6 of the second exemplary embodiment has a wave contour that is uniformly uniform in the axial direction only along a single straight line along which the radial height differences H _{D have} their maximum values. The wave contour with the maximum values of the radial height differences H _D can be seen in the longitudinal views of FIGS. 7 and 14. Diametrically opposite creates a single, exact line on which consequently the minimum values of the radial height differences H _{D are} again "zero". Over the circumference between these two straight lines, the wave contours in the axial direction in the apex regions of the head sections 8 have straight plateaus, as can be seen from FIGS. 8 to 13. The two inner circles drawn in the end views of FIGS. 7 to 14 are, on the one hand, the vertex circle of the foot sections 7 and, on the other hand, the vertex circle of the head sections 8. All cross sections which lie in the axial direction between the vertex circles of the foot sections 7 and the vertex circles of the head sections 8, deviate from the circular shape according to the manufacturing process. The transitions between the straight plateaus of the head sections 8 and the round foot sections 7 are preferably circular in the circumferential direction and axial direction by surface finishing, for example by grinding and polishing.

The fluid channels 15 can only be incorporated into the asymmetric rotary body 6 have been. You can also after receipt of the starting body 6 'in this or, alternatively, they may already be incorporated into the straight cylindrical, smooth cast body may have been incorporated, if the Output body 6 'was obtained from, for example, such a body. Of the Starting body 6 'may instead, for example, by pressing and sintering have been received and already due to an appropriately set Material porosity form the fluid channels as pore channels.

The formation of a fluid cushion between the web and the surface of the Rotational body is already very beneficial in a rotationally symmetric Rotational body, as it can be formed by the starting body 6 '.

FIG. 15 shows such a rotary body which is used to distinguish it from FIG Reference numeral 60 is designated.

The shape and arrangement of the fluid channels 15 in the longitudinal direction and in the circumferential direction of the rotation body 60 are the same as those of the variable rotation body 6. The rotary body 60 may be rotatably mounted to the friction with the reduce looping track. However, it is also completely sufficient and will even preferred if the rotary body 60 is not rotatable in the machine frame is stored. The symmetry and longitudinal axis is therefore not with D, but for Distinction of a rotation axis denoted by L. Incidentally, however, the same reference numerals as used in the variable rotation body 6.

Further, the formation of an air cushion or a cushion of another gas is not only advantageous in connection with a one-piece rotary body 6 or 60, but even with a rotational body of several axially juxtaposed Rolls and in principle also in other embodiments of rotary bodies. In Reference to such other embodiments, the adjustable or not can be adjustable, but the fluid loading of the invention having wave-shaped surface, reference is again made to EP 1 101 721 A1, which is also referred to in this regard. However, they would have to be there described embodiments of integral rotational bodies or multipart Rotationskörpergebilden in the mantle of the rotating body or in the coats of a plurality of rotary body of a rotary body structure with fluid channels and a Be provided fluid connection for the fluid channels.

Claims (22)

FanOut compensator for a printing press, comprising a rotary body formation (6; 60) having foot sections (7) and head sections (8) arranged side by side along a longitudinal axis (D; L) forming a wave-shaped surface (9, 10), for undulating a web (W) to be printed, which wraps around the rotating body (6; 60), in a wave form transverse to a conveying direction of the web (W),
characterized in that
in the rotary body formation (6; 60) fluid channels (15) are formed which open on the surface (9, 10) of the rotary body structure (6; 60),
and in that the rotary body formation (6; 60) has a fluid port (13, 14; 11) connected to the fluid passages (15) for supplying pressurized fluid to the fluid passages (15) and through the fluid passages (15) to the surface (9, 10) ) of the rotary body structure (6; 60). FanOut compensator according to claim 1, characterized in that the rotary body structure (6; 60) has an internal cavity (11) into which the fluid channels (15) open. FanOut compensator according to one of the preceding claims, characterized in that all the fluid channels (15) or a part of the fluid channels are bores. FanOut compensator according to one of the preceding claims, characterized in that the fluid channels are formed by material porosity. FanOut compensator according to one of the preceding claims, characterized in that the rotational body structure (6) rotatably mounted on a hollow shaft (12) or secured against rotation on a hollow shaft and the hollow shaft (12) or hollow shaft forms the fluid port (13, 14), so the fluid can be fed to the fluid channels (15) through the hollow axle (12) or hollow shaft. FanOut compensator according to the preceding claim, characterized in that a jacket of the hollow shaft (12) or hollow shaft is interrupted by a longitudinal opening (14) extending in the radial direction directly to a longitudinally extending, of fluid channels (15) in the radial direction crossed, strip-shaped region of the rotary body structure (6) opens. FanOut compensator according to one of the preceding claims, characterized in that the foot portions (7) and the head portions (8) relative to each other about the longitudinal axis (D; L) of the rotary body structure (6; 60) are not rotatable. FanOut compensator according to the preceding claim, characterized in that the rotary body formation (6; 60) forms the foot sections (7) and head sections (8) in one piece. Rotational body structure according to one of the preceding claims, characterized in that the head portions (8) protrude by radial height differences (H _D ) over the foot portions (7) and the radial height differences (H _D ) of minimum values along a longitudinal axis (D ) parallel offset first straight line (T ₁ ), in the circumferential direction up to maximum values, which they along a to the longitudinal axis (D) parallel offset second straight line (T ₂ ) increase. FanOut compensator according to the preceding claim, characterized in that the minimum values are equal, preferably equal to "zero". FanOut compensator according to one of the two preceding claims, characterized in that the maximum values are the same. FanOut compensator according to one of the preceding claims, characterized in that the foot sections (7) form radially outwardly concave surface sections (9), which are preferably continuously differentiable in the axial direction. FanOut compensator according to one of the preceding claims, characterized in that the head sections (8) form radially inwardly concave surface sections (10), which are preferably continuously differentiable in the axial direction. Rotary body according to one of the preceding claims, characterized in that in the circumferential direction about the longitudinal axis (D) changing radial height differences (H _D ) in the circumferential direction about the longitudinal axis (L) is continuous, preferably continuously differentiable. FanOut compensator according to one of the preceding claims, characterized in that in the circumferential direction about the longitudinal axis (D) changing radial height differences (H _D ) along tangents (T ₁ , T ₂ , which touch the head portions (8) and to the Longitudinal axis (D) are parallel, are the same. FanOut compensator according to one of the preceding claims, characterized in that the foot sections (7) and the head sections (8) form surface sections (9, 10) which abut one another on a neutral circular cylinder jacket surface (N), and in that the longitudinal axis (D; L ) of the rotary body structure (6; 60) is a central longitudinal axis of the neutral circular cylinder jacket surface (N). FanOut compensator according to the preceding claim, characterized in that the foot portions (7) radially under the neutral circular cylindrical surface (N) and the head portions (8) radially over the neutral circular cylindrical surface (N) in the axial direction arcs of a surface wave contour of the rotary body structure (6 60) and that in each of the longitudinal axis (D; L) enclosing axial section of the rotary body formation (6) of the foot sections (7) formed arcs have the same shape as the arcs formed by the head portions (8), if the of Foot portions (7) arches are folded on the side of the arches formed by the head portions (8). FanOut compensator according to one of the preceding claims, characterized in that the rotating body structure (6; 60) in a printing machine between an upstream printing nip (2) and a downstream printing nip (3), in which the traversing in a print production web (W) in a row is printed, is arranged to one side of the web (W) and is wrapped by the web (W). FanOut compensator according to one of the preceding claims, characterized in that the rotary body structure (6) for a controlled or controlled Verstelldrehbewegung about its longitudinal axis (D) with an actuator (17) of a control and regulating device (17, 18, 19) is connected , FanOut compensator according to one of claims 1 to 18, characterized in that the rotary body structure (60) in a frame of a printing press about its longitudinal axis (L) is not rotatably mounted. FanOut compensator according to the preceding claim, characterized in that the rotational body formation (60) is rotationally symmetrical with respect to its longitudinal axis (L). Method for compensating the fanout in a printing press, in which a) the web (W) is printed in each case with printing ink in a first printing nip (2) and then in a second printing nip (3) and is preferably moistened with dampening solution, b) and in which the web (W) between the press nips (2, 3) wraps around a rotary body structure (6; 60) having a surface (9, 10) which is corrugated transverse to a conveying direction of the web (W), so that the web (W) is deformed wave-shaped transversely to the conveying direction,
characterized in that c) the web (W) during the wrapping on its bottom side facing the rotary body structure (6; 60) is acted upon by a pressurized fluid which exits at the surface (9, 10) of the rotary body structure (6; 60), so that between the wave-shaped Surface (9, 10) of the rotating body structure (6; 60) and the web (W) creates a fluid gap and is maintained.

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