EP1369368A1 - Rotating element for compensating the fan-out of a web - Google Patents

Abstract

The device has alternating foot (7) and head (8) sections along a rotation axis (D) in a rotationally stiff connection or in one piece and with radial height differences, whereby the height differences increase in the peripheral direction from minimal values along a first line (T1) offset relative to the rotation axis to maximum values along a second line (T2) parallel to the rotation axis. AN Independent claim is also included for the following: (a) a method of manufacturing an inventive rotation body for compensation of fan-out in printing machine.

Description

The invention relates to a rotary body which in a printing machine of Compensation of the Fanout serves or, outside the printing press, for installation is provided for the purpose of fanout compensation. It's the press is a machine that prints wet, preferably using a Dampening solution. Offset printing should be mentioned here as an example. In particular, the printing press may be a newspaper printing press for the printing of be big newspaper editions. The web is preferably endless through the machine guided and unwound from a roll, i. the printing press is in such Execution of a web-fed printing press and more preferably one 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 fanout 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 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. Since that's up the extent of latitude change due to fanout from production to production Production and even within a production due to a paper change can change the paper grades, EP 1 101 721 A1 describes under also adjustable fanout compensators with which the amplitude of the embossed waveform of the web can be selectively changed. An increase in the Amplitude causes a decrease in the width of the web. The described embodiments of adjustable fanout compensators are ever made by several, along one Rotary axis of the respective compensator alternately arranged side by side Bodies are formed, which correspond to the desired waveform of the web radially forming projecting head portions and receding foot portions which are relative are adjustable to each other to the extent of the projecting and standing behind the Sections in adaptation to the extent of attributable to the fanout To adjust the width change. However, the well-known, well-known Devices complex and therefore cause comparatively high Acquisition cost .

In EP 1 101 721 A1 also a fanout compensator is described, which as a rotating body is formed in one piece. This comparatively simple Compensator has already proven itself in practice. Adaptation to changing Production conditions are with such a compensator but only by Provision of several different bodies of revolution possible, which in the Printing machine stored for example in a removable frame and by a Adjusting movement of the removable frame either in the print production or from the Print production can be taken.

It is an object of the invention to compensate for the fanout attributable change in width of a web to be printed also in adaptation to different production conditions in a simple and inexpensive way too enable.

The invention relates to a rotary body, which is suitable for compensation of the fanout in a printing machine provided or already installed in the machine to one to embracing the printing web around the rotating body. Of the The wrap angle should be at least 3 °. A wrap angle of 5 ° or more, for example 10 °, however, is preferred. Of the Wrap angle can be up to 180 °. The body of revolution is for one Drehlagerung provided about an axis of rotation, extending through the rotary body extends. It forms along the axis of rotation next to each other alternately head sections and Foot sections. The surface sections formed by the head and foot sections form the mantle surface of the rotating body. The head sections are above the Foot sections radially to the axis of rotation by height differences. The so in the axial direction Although the wave contour obtained may in principle contain cracks, it is preferable but steadily. Particularly preferably, it is continuously differentiable in the axial direction and curved, as well as this by the production methods available in practice for a economic price is feasible. If curved sections with curvatures, the are different, or arc sections collide with straight axial sections, the wave contour can have kinks. Such kinks should be obtuse or even better worked around.

According to the invention, the head and foot sections are relative to each other around the Rotational axis not rotatable by either joined together and torsionally rigid with each other are connected or formed by the rotary body in one piece. Examples Although such rotary bodies with wave profile are basically from EP 1 101 721 A1 known. However, the invention carries the feature of torsionally stiff connection or, more preferably, the one-piece with the advantage of adjustability together by the existing between the head portions and the foot sections radial Height differences of minimum values, which they parallel along one axis of rotation have staggered first straight line, in the circumferential direction about the axis of rotation up to Maximum values increase. Preferably, the height differences in Circumferential direction monotone. The maximum values show the height differences a parallel to the rotation axis offset second straight line. The first straight line and the second straight lines are preferably tangents to all head sections, if namely all head sections have the same radial height with respect to the axis of rotation. Is this not 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.

In a preferred embodiment, the height differences take their maximum values along a single straight line. In principle, however, it is possible that the maximum values not just along one straight line, but one over a certain arc length assumed to be around the axis of rotation. This can basically also apply to the minimum values.

The rotary body according to the invention is easy to install in the printing press and can in the same way as other rotation body of the printing press, for example Deflection rollers, be rotatably mounted. An assembly of relative to each other adjustable parts, as in the known adjustable fanout compensators, is not mandatory.

Although the one-piece over the entire width of the web clearly the preference is given, a fanout compensator is advantageous to the formation of some a few integral rotating bodies, for example two rotating bodies, along their common axis of rotation are arranged side by side. Opposite one Rotation body of torsionally rigid joined individual bodies, each one Head section or foot section and also still subject of the invention are the assembly of optionally two or three rotating bodies with Wavy profile much easier.

The radial height differences, by which the head sections project beyond the foot sections, grow circumferentially from their minimum values, preferably both Turning monotonously on. More preferably, they grow steadily in both directions of rotation. It is best if they are continuous in both directions continuously grow, which mathematically means that the applied over the rotation angle Radial height differences per ever differentiable functions of the rotation angle. Particularly preferably, the height differences grow linearly or at least approximately linear with the angle of rotation.

Preferred embodiments correspond to those formed by the head sections Surface sections each have the same shape. Also for the foot sections is the Equality of the shape of their surfaces preferred. The surfaces of the head sections and / or the surfaces of the foot sections should be in each cross section along the Rotary axis forming circles. Others, round in the circumferential direction around the axis of rotation everywhere However, surfaces are also advantageous. Should be in the circumferential direction to the Rotary axis caused by a method of manufacturing kinks occur, so should the at the kinks colliding, round elbows as possible obtuse angles, which should be at least 120 °, abut each other. Favorable It is, however, if in the circumferential direction kinks or even jumps for the can be avoided by such manufacturing process rotational body obtained by the kinks or even jumps through a suitable post-processing, such as for example, grinding and polishing, work around.

A fanout compensator placed in a suitable location on the path of the railway between two pressure nips is arranged, comprising the rotary body according to the invention, a Drehlagerung, in which the rotary body is rotatably mounted about its axis of rotation, and a controller or controller having an actuator for generating a Adjusting rotational movement of the rotating body about its axis of rotation. The Verstelldrehbewegung is a rotary movement, through which the body of revolution from a first angular position in which the web is symmetrical with respect to the body of revolution wraps around on a first wave contour to its axis of rotation in another, second Rotationwinkelpösition is twisted, in which the web the body of revolution symmetrically in Wrapped around a differently shaped, second wave contour. One of the Wave contours can be a straight line, if that is the minimum height differences Are "zero".

In a further development, the rotary body on fluid channels, which at its Surface form a variety of estuaries. The fluid channels serve in one Particularly advantageous method of fanout compensation to the surface of To apply rotational body with fluid. The fluid is preferably under pressure standing gas and can be in particular compressed air. The fluid forms in the of the Web looped area between the surface of the rotating body and the facing bottom of the web a fluid gap, a kind of fluid cushion. The fluid gap prevents adhering, not yet dried paint on the underside of the web The rotational body can be transmitted, which could cause interference. Furthermore, the friction is reduced.

The fluid channels may be formed as bores and extending from their mouths on the surface through the body of revolution radially inward to one or optionally extend a plurality of cavities through which or they with a Fluid source are connected. Such bores can be straight and be formed unbranched.

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 However, branch out also to the outer surface and there are several Forming mouth points. It can also cross connections between the fluid channels consist. So it corresponds to a likewise preferred embodiment, the Total rotational body or in the case of training as a hollow body at least its the fluid channels forming ring portion with a for the fluid line to provide sufficient porosity. The porosity is preferably an open one Porosity, so that the pores formed by the material form the fluid channels. For the formation of a porous rotating body or rotating body ring section In particular, the original molding is suitable by molding a powder, preferably a metal powder, with subsequent or simultaneous sintering of the compact. It can in the same body of revolution also formed on both types of fluid channels occur together, i. it can be in the same body of revolution both pore channels as well as subsequently incorporated fluid channels may be present.

The mouth points of the fluid channels can over the surface of the rotating body be arranged distributed uniformly in the axial direction and in the circumferential direction. The However, the density of the points of discharge 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 body of revolution can in the way of the Urformung in one piece in the inventive shape or in several pieces, the torsionally rigid with each other are connected, be formed, for example, by the already mentioned molding and sintering a powdery raw material. The starting material is preferably a powder of a metal or a metallic alloy, but may instead be a plastic powder or granules. If the rotation body a Plastic body is, it makes sense, this rotary body as an injection molded body in To form injection molding, so that it is obtained as an injection molded body.

In order for a metallic body of revolution to be ideally round, preferably to obtain continuously differentiable, spatial waveform come In particular, methods of forming, such as forging in the die, as Manufacturing process in question. "From the full milling" is basically also possible.

In another, particularly simple method of production is used in a first Step shaped a rotational body that is rotationally symmetric with respect to a single Symmetrielängsachse is. The mantle surface of such a one-piece In particular, output body may have a regular waveform with Foot sections, each forming the same surface sections, and with head sections, each also form the same surface sections. The inventive Rotation body is removed from the starting body by a materialabnehmende Processing with a tool received. For example, the tool can be Milling head, a line roughing, grinding and polishing tool or preferably be a spin. When removing the material perform the starting body and the Tool relative to each other a rotational movement about one to the symmetry longitudinal axis of the parent body eccentric, i. parallel offset, machining axis. It can the tool around the resting starting body or it can both the Starting body and the tool rotated about the machining axis relative to each other become. Likewise, the output body around the machining axis for the material-removing machining to be rotationally driven while the tool no rotational movement relative to a frame of a machine tool in which the Output body is clamped, executes. For the material-reducing processing is during the relative rotational movement, the radial distance between the tool and the Machining axis reduced. This is preferably done by the tool is moved radially straight to the machining axis. The distance will be as long reduces until the tool has reached the first straight line, along which the radial Height differences between the foot sections and the head sections are "zero". Any remaining oversize after removal of the material, by means of Surface finishing is still accepted later, be here once neglected.

Particularly preferred features are also described in the subclaims.

Fig. 1

einen Druckturm mit einem Rotationskörper nach der Erfindung,

Fig. 2

den Rotationskörper nach einem ersten Ausführungsbeispiel 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 nach einem zweiten Ausführungsbeispiel gebildet wird,

Fig. 7-14

den Rotationskörper des zweiten Ausführungsbeispiels in unterschiedlichen Drehwinkellagen.

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

Fig. 1

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

Fig. 2

the rotational body according to 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 according to a second embodiment is formed by a material-removing machining,

Fig. 7-14

the rotational body of the second embodiment in different rotational angle positions.

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, through which a web W is conveyed and from 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 web width measured transversely to the conveying direction of the web W would increase from printing nip to printing nip, and the printed images printed consecutively in the printing nips 1 to 4 in the transverse direction of the web would not match one another, ie register errors would result in the transverse direction. This phenomenon is known as _"fan-out". The increase in width would be greatest between the two H-bridges, ie between the pressure gaps 2 and 3, since the distance from gap to gap is longer there 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, an alternative printing position is 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 FIGS. 2 and 3, the rotary body 6 is each in the same cross section, but in FIG represented 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 in the following as the axis of rotation designated. The rotary body 6 is in one piece in a process of Urformung or forming formed and finished on the surface, preferably only evenly smoothed. The rotation body 6 is in relation to the rotation axis D. not rotationally symmetric.

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 after 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 those 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 Figures 7 to 14 was made. Of the Starting body 6 'has the same axis along its axis of symmetry S, regular wave contour on its surface. He can, for example, by Compression molding and sintering are obtained. Likewise, he can from a circular cylindrical Casting can be obtained by a material-removing machining. By means of a exciting processing, the output body 6 'can be obtained in that the previously smooth cylinder casting with its axis of symmetry S as the axis of rotation in one Lathe clamped and a Drehmeisel the machine along one of the Shaft contour corresponding template is moved axially and thereby the Waveform forms.

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 starting 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 also the axial Distance between two adjacent vertices of the foot sections 7. This distance or the division amounts to a quarter of the measured in the axial direction Width of a printing plate used in current print production. The division of Wave contour of the rotating body 6, which was obtained from the starting body 6 ', is therefore 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 portions 8 and the round, convex foot portions 7 are preferably circular in the circumferential direction and in the 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 such a body.

The formation of a gas cushion, preferably air cushion between the web and the Surface of the rotating body is already very advantageous in a rotationally symmetric body of revolution, as formed by the output body 6 ' can be. The shape and arrangement of the fluid channels 15 in the longitudinal direction and in Circumferential direction of the rotary body 6 'may be the same as in the adjustable Be rotating body 6. The rotary body 6 'can be rotatably mounted to the Reduce friction with the wrap around the web. It is, however, completely sufficient and is even preferred when the rotary body 6 'is not rotatable in is mounted on the machine frame.

The formation of an air cushion or cushion of another gas is not only advantageous in conjunction with a one-piece rotating body 6 or 6 ', 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 invention Fluidbeaufschlagung the surface of the rotational body, reference is again made to EP 1 101 721 A1, which also referred to in this regard. However, those described there would have to be Embodiments of integral rotary 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 (28)

Rotary body for compensating the fanout in a printing press which forms along an axis of rotation (D) in rotationally rigid connection or in one piece adjacent foot sections (7) and on the foot sections (7) by radial height differences (H _D ) projecting head portions (8) in which the radial height differences (H _D ) of minimum values which they have along a first straight line (T ₁ ) offset parallel to the axis of rotation (D) are in the circumferential direction up to maximum values which they offset along a direction parallel to the axis of rotation (D) second straight line (T ₂ ), increase. Rotary body according to claim 1, characterized in that the minimum values are the same. Rotary body according to the preceding claim, characterized in that the minimum values are _" 0". Rotary body according to one of the preceding claims, characterized in that the maximum values are the same. Rotary body according to one of the preceding claims, characterized in that the foot sections (7) form surface sections (9) each of the same shape. Rotary body according to one of the preceding claims, characterized in that the head sections (8) form surface sections (10) each of the same shape. Rotary body according to one of the preceding claims, characterized in that the foot portions (7) form radially outwardly concave surface portions (9). Rotary body according to the preceding claim, characterized in that the surface sections (9) formed by the foot sections (7) are continuous in the axial direction. Rotary body according to the preceding claim, characterized in that the surface sections (9) formed by the foot sections (7) are continuously differentiable in the axial direction. Rotary body according to one of the preceding claims, characterized in that the head sections (8) form radially inwardly concave surface sections (10). Rotary body according to the preceding claim, characterized in that the surface sections (10) formed by the head sections (8) are continuous in the axial direction. Rotary body according to the preceding claim, characterized in that the surface sections (10) formed by the head sections (8) are continuously differentiable in the axial direction. Rotary body according to one of claims 7 to 12, characterized in that the surface sections (9) formed by the foot sections (7) and the surface sections (10) formed by the head sections (8) merge into one another continuously. Rotary body according to the preceding claim, characterized in that the surface sections (9) formed by the foot sections (7) and the surface sections (10) formed by the head sections (8) merge tangentially into one another. Rotary body according to one of the preceding claims, characterized in that in the circumferential direction around the axis of rotation (0) changing radial height differences (H _D ) in the circumferential direction around the axis of rotation (D) are continuous, preferably continuously differentiable. Rotary body according to one of the preceding claims, characterized in that in the circumferential direction about the axis of rotation (0) changing radial height differences (H _D ) along tangents (T ₁ , T ₂ ), which touch the head portions (8) and to the axis of rotation (D) are parallel, are the same. Rotary body according to one of the preceding claims, characterized in that the foot portions (7) and the head portions (8) form surface portions (9, 10) which abut against each other at a neutral circular cylindrical surface (N), and in that the rotation axis (D) of the rotation body (6) is a central longitudinal axis of the neutral circular cylindrical surface (N). A rotational body 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) form radially over the neutral circular cylindrical surface (N) in the axial direction arcs of a surface wave contour of the rotary body (6) and that in each axis of rotation body (6) enclosing the rotation axis (D), the arcs formed by the leg portions (7) have the same shape as the arcs formed by the head portions (8) when the arcs formed by the leg portions (7) be folded on the side of the arches formed by the head portions (8). Rotary body according to one of the preceding claims, characterized in that the rotary body (6) for a controlled or controlled Verstelldrehbewegung about its axis of rotation (D) with an actuator (17) of a control or regulating device (17, 18, 19) is connected. Rotary body according to one of the preceding claims, characterized in that the rotary body (6) in a printing machine between an upstream printing nip (2) and a downstream printing nip (3), in which in a print production, the continuous web (W) is printed one behind the other, to one side of the web (W) is arranged and is wrapped by the web (W). Rotary body according to one of the preceding claims, characterized in that in the rotary body (6) fluid channels (15) are formed, which on the surface (9, 10) of the rotary body (6) form a plurality of mouth points to a fluid to the surface of the rotary body (6) to lead. Rotary body according to the preceding claim, characterized in that the rotary body (6) has an inner cavity (11) into which the fluid channels (15) open. Rotary body according to one of the two preceding claims, characterized in that all the fluid channels (15) or at least a part of the fluid channels are bores. Rotary body according to one of the three preceding claims, characterized in that the fluid channels are formed by material porosity. Rotary body according to one of the four preceding claims, characterized in that the rotary body (6) rotatably mounted on a hollow shaft (12) or secured against rotation on a hollow shaft which forms a fluid connection for the rotary body (6), so that a fluid through the hollow shaft (12) or hollow shaft the fluid channels (15) can be fed. Rotary body according to one of the preceding claims, characterized in that the rotary body (6) is formed in a process of primary forming or forming, in one piece or by joining and torsionally rigid joining of several such shaped sections. Rotary body according to one of claims 1 to 13, 15, 16 and 19 to 25, characterized in that the rotary body (6) is obtained from a with respect to the axis of rotation (D) rotationally symmetrical starting body by a material-removing machining with a tool in which between the rotary body (6) and the tool a relative rotational movement about a to the rotation axis (D) eccentric machining axis (B) takes place and a radial distance between the machining axis (B) and the tool is reduced. A method of manufacturing the rotary body (6) according to any one of claims 1 to 13, 15, 16, 19 to 25 and 27, wherein: a) a rotationally symmetrical to the rotational axis (D) output body (6 ') is formed with a wave profile on its surface, which has the same periodicity as on the surface (9, 10) of the rotary body (6) formed wave profile, b) the output body (6 ') and a material-removing tool facing its surface execute a relative rotational movement about a machining axis (B) offset in parallel with the axis of rotation (D) c) and that during the relative rotational movement, a radial distance between the machining axis (B) and the tool along the machining axis (B) uniformly reduced and thereby material on the surface of the starting body (6 ') is removed.

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