EP0803354B1 - Cylinder of a rotary printing press having a changeable outside diameter - Google Patents

Description

The invention relates to a sheet guide cylinder, one Rotary printing machine, the outside diameter of which is elastic deformable, partially circular, inherently rigid cylinder jacket by means of a adjusting device acting on the cylinder jacket is changeable.

GB 2 166 388 describes a circumferentially adjustable Printing press cylinder with a deformable cylinder jacket segment, the one external, the cylinder curvature substantially corresponding arcuate section and two inwardly extending at an acute angle Has leg, which is firmly connected to the cylinder base body via screws are. With the help of two independent adjustment screws, which are screwed into the threaded holes of the Cylinder base body are included and on the associated outer sides of the Act leg, it is with a very special choice of the cylinder jacket segment spanned angle and between the surface normal of the Jacket segment and the adjustment screws included angle possible, that To have concentric cylinder jacket segment.

GB 1 230 314 describes an adjustable transfer cylinder for a Printing machine which has peripheral surface segments, which with the help of a two coupled eccentric adjusting device and one by a Actuated cam, the eccentric rotating toggle are radially movable.

EP 0 185 965 describes a transfer drum for a printing press, which comprises a total of three shell segments, each pivotable with its first end are stored near an associated gripper device of the transfer cylinder and the other end of each by means of a control disc rotatable about the cylinder axis can be moved outwards or inwards.

Another cylinder emerges from German patent 44 34 828. If in The preamble of claim 1 is a "part-circular" cylinder jacket, this does not mean that only mathematically exact pitch circle contours are recorded, but also those that are approximated to a pitch circle, i.e. certain ones Show roundness. The cylinder known from the prior art has one elastically deformable cylinder jacket, which is supported by rollers 4, which on Sloping surfaces of an adjusting disc 5 lie relative to an inner one Cylinder base body can be rotated. If a twist is made, so changes the radial distance of the rollers from the cylinder body, whereby the Cylinder jacket expanded or - depending on the relative direction of rotation - in diameter is reduced. The diameter can be adjusted to the Substrate thickness possible. The known construction has the disadvantage that the relatively thin material (e.g. chrome foil) existing cylinder jacket only locally is supported and therefore has a polygonal contour. Furthermore, at one punctiform load dented the chrome foil and the associated support plate and damaged. This can e.g. B. already done through a crumpled sheet. In the area the clamping point, the known design has no roundness.

The invention is therefore based on the object of a cylinder of the type mentioned Specify type that improves on the disadvantages mentioned above is trained.

This object is achieved by the features of claim 1.

The configuration according to the invention creates a cylinder jacket which in essentially has an inherent rigidity, that is to say that it inherently approx has part-circular contour without this being generated by the support measures becomes. The inherent rigidity is designed such that a sufficient Dimensional stability is given, however, for a diameter adjustment corresponding elasticity remains. This cylinder jacket works with an actuator together, which is radially displaceable relative to an inner cylinder body. For this the actuator is mounted on the cylinder body in an adjustable manner in the radial direction. A Relocation of the actuator leads to the cylinder jacket with its area which the control element attacks, is displaced in the same direction, that is, in the same radial direction. This radial displacement takes place depending on the direction for an area of the Cylinder jacket an increase or decrease in diameter, wherein however, the remaining areas of the cylinder jacket for optimization of the Diameter adjustment must also be shifted. This is done by a elastic deformation of the cylinder jacket, that is, it is by means of a Force deflection device deformed accordingly, with the force deflection device on the cylinder jacket exclusively forces or only torques or Exerts forces and torques to set the desired contour. Due to the The inherent rigidity of the cylinder jacket is only a few force and / or Moment application points required, so that the force deflection device is very simple can be trained. This simple training also meets one Adjustment device with which the actuating part is displaced radially relative to the cylinder body can be. From this radial displacement, a travel path is derived, which the Force deflecting device which acts on the deformation of the Cylinder jacket. The force deflection device acts in particular on the End areas of the cylinder jacket, that is to the end areas of the cross section part-circular contour.

According to a development of the invention, it is provided that the cylinder jacket on the actuator is attached. The cross-sectional contour of the cylinder jacket is preferably radial extending symmetry plane formed symmetrically. The attachment of the cylinder jacket on the actuator preferably takes place in the area of this plane of symmetry, so that the Area of the cylinder jacket assigned to the plane of symmetry by means of the actuating part at Actuating the adjusting device is shifted radially. In contrast, the Diameter adjustment in the symmetrical to the plane of symmetry remaining areas of the cylinder jacket by its elastic deformation by means of Power diverting device.

In particular, it is provided that the cylinder body has a circular cylindrical cross section having. For example, it can form the shaft of the cylinder.

The actuator is preferably on by means of sliding blocks supported on the cylinder body this stored, which enables the straight radial movement. In particular is provided that two sliding blocks arranged symmetrically to the plane of symmetry available. The word "each" mentioned in the previous sentence indicates that - about the Seen longitudinal extension of the cylinder - several assemblies of the adjusting device are provided so that the entire cylinder surface can be adjusted evenly. In particular, assemblies are provided in the end regions of the cylinder. However, it is it is also possible to provide additional modules between the end areas. The assemblies are either all adjusted evenly or differently, for example to obtain a spherical contour of the cylinder. Also the formation of concave contours possible to bring about special pressure stands. That way for example, tight printing can be avoided. In the following - of simplicity for the sake of detail only on one assembly of the cylinder, but as mentioned above several such assemblies spaced from one another over the longitudinal extent of the Cylinder can be arranged distributed.

According to a development of the invention, it is provided that the force deflection device Has double levers which are pivotally mounted on the actuating part and each with their one, first lever arm with the cylinder body and with its other, second lever arm on the Act on the cylinder jacket. Is there a radial displacement of the actuator relative to Cylinder body, the double levers pivot due to the support of their first Lever arms on the cylinder body. Due to the pivoting movements of the double lever by means of their second lever arms, an action on the cylinder jacket, namely on the Inside of the cylinder jacket, so that this causes an elastic deformation becomes. The application can take place by means of forces and / or torques, depending on which curve shape the outer contour of the cylinder should receive. The aim is mostly a part-circular contour that best matches a mathematical part-circle is approximated.

The double lever can preferably be designed as an angle lever, that is, the two Lever arms of each double lever enclose an angle. For an optimal bending contour at the elastic deformation of the cylinder jacket is preferably provided that the Cross section of the cylinder jacket is tapered towards its end regions. Suitable material and / or cross-sectional contour selection can be used in this way achieve a bending characteristic that, in cooperation with the force deflection device the desired cylinder jacket contour.

Figur 1

eine schematische Ansicht einer Rotationsdruckmaschine,

Figur 2

eine Prinzipskizze eines Zylinders mit veränderbarem Außendurchmesser,

Figur 3

ein Ausführungsbeispiel eines derartigen Zylinders in der Stellung "kleinster Durchmesser",

Figur 4

eine Darstellung gemäß Figur 3, jedoch in der Stellung "größter Durchmesser",

Figur 5

eine Schnittansicht entlang der Linie VI-VI in Figur 3, und

Figur 6

ein weiteres Ausführungsbeispiel eines Zylinders.

The drawings illustrate the invention on the basis of exemplary embodiments, namely:

Figure 1

1 shows a schematic view of a rotary printing press,

Figure 2

a schematic diagram of a cylinder with a variable outer diameter,

Figure 3

an embodiment of such a cylinder in the "smallest diameter" position,

Figure 4

3, but in the "largest diameter" position,

Figure 5

a sectional view taken along the line VI-VI in Figure 3, and

Figure 6

another embodiment of a cylinder.

FIG. 1 shows a schematic side view of a rotary printing press 1, the two Printing units 2.3 has. The printing units have a large number of cylinders have different tasks, with at least some of the cylinders Form sheet guide drums that transport the sheets to be printed. To one The outer diameter is to be adapted to different thicknesses of paper certain cylinders changeable.

FIG. 2 shows the principle of a cylinder which is adjustable in the outer diameter. With 4 is the axis of rotation of such a cylinder 5 marked. It has a cylinder jacket 6, which is part-circular. There is a plane of symmetry 7, which by the Rotation axis 4 runs, a symmetrical design of the contour of the cylinder jacket 6. At right angles to the plane of symmetry 7 runs a plane of symmetry 8, which also passes through Axis of rotation 4 runs.

By means of an adjusting device, not shown in detail in FIG. 2 (Double arrow 9), the cylinder jacket 6 along the plane of symmetry 7 in Shift radial direction (radial shift R '), so that there is a dashed line sets the registered position of the cylinder jacket 6. However, this situation is only mental in place, as the radial displacement causes the cylinder jacket 6 to expand at the same time takes place, that is, it is elastically deformed. This can be done after a first Embodiment of the invention take place by means of a force F, which in the end regions 10 of the cylinder jacket 6 attacks. According to another embodiment, it is also conceivable that a moment M acts on the respective end region 10, so that the position of the cylinder jacket, which is identified in FIG. 2 by 6 '. It becomes clear that there is an enlarged outer diameter in this position.

Figure 3 shows an embodiment according to the principle of operation of Figure 2. The cylinder 5 has an inner cylinder body 11 which can be rotated in by means of bearings (not shown) the rotary printing press is stationary. The cylinder body 11 has one circular cross section. An actuator 12 is in the form of an adjusting ring 13, the has an inner bore 14 which has a larger diameter than the cylinder body 11 having. On the adjusting ring 13, two sliding blocks 15 are arranged, which are on both sides of the Plane of symmetry 7 are located radially by means of threaded screws 16 in their distance can be adjusted to each other. The front end faces 17 of the two sliding blocks 15 between them - with little play - on the cylinder body 11, the Central axes of the sliding blocks 15 and the threaded screws 16 in the plane of symmetry 8 lie. In this way, the adjusting ring 13 is radially displaceable on the Cylinder body 11 mounted, namely a radial displacement in the direction of Plane of symmetry 7 and perpendicular to the axis of rotation 4 possible.

The radial displacement of the adjusting ring 13 relative to the cylinder body 11 is by means of a Adjustment device 18 possible, which has a threaded spindle 19 which in a Threaded bore 20 of the cylinder body 11 is screwed. Threaded spindle 19 and Threaded bore 20 lie in the plane of symmetry 7 and run under a right one Angle to the axis of rotation 4. The threaded spindle 19 passes through a radial bore 21 of the Adjustment ring 13 and at the end has an adjustment knob 23 provided with a scale 22.

The adjusting knob 23 has a larger diameter than the radial bore, so that it can be supported on a support surface 24 of the adjusting ring 13. A slide ring 25 is with the Threaded spindle 19 pinned and is - with little play - a support surface 26 one Recess 27 opposite, the recess 27 as an open edge, from the inner bore 14 outgoing recess is formed. In this way you can Turning the adjusting knob 23, the relative position between the adjusting ring 13 and Adjust the cylinder body 11 in the radial direction. The set value can be changed using a Read pointer 28 from scale 22.

A gripper support bar 29 and a gripper system 30 are on the cylinder body 11 attached. The cylinder jacket 6 of the cylinder 5 is part-circular, that is, between its ends 31 there remains a circumferential angle Gap space in which the adjusting button 23 and the gripper support bar 29 and that Gripper system 30 are. In the area of the plane of symmetry 7, the cylinder jacket 6 is by means of Fastening screws 32 attached to the adjusting ring 13. In the area mentioned, the Cylinder jacket 6 has a support surface 33 which by means of the fastening screws 32 with the Periphery 34 of the adjusting ring 13 is clamped. On the setting ring 13 is one Force deflection device 35 arranged. It has two double levers 36, which as Angle levers 37 are formed. Each angle lever 37 has a first lever arm 38, whose crowned end region 39 with the lateral surface of the cylinder body 11 cooperates, that is, is supported there. The second lever arm 40, which is under one An angle between 0 ° and 180 °, preferably 90 ° to the first lever arm 38, points in End region 41 has a roller 42, which is located on the inner surface 43 of the cylinder jacket 6 is supported in the end region 44 of the cylinder jacket 6. The respective angle lever 37 is in his knee area pivotally mounted on the adjusting ring 13 by means of a bolt 45, wherein this bearing preferably above the plane of symmetry 8, that is, on the Setting device 18 has the side of the adjusting ring 13.

In the area of the plane of symmetry 7 is the cylinder jacket 6 with its greatest wall thickness Mistake. Starting from the support surface 33, the wall thickness increases symmetrically Plane of symmetry 7- towards the ends 31, the outer surface 46 of the Cylinder jacket has a partial circular shape and the inner surface 43 for this purpose such course takes so that the cross-sectional taper towards the ends 31 results. The cylinder jacket 6 is made with the smallest radius, that is, a larger one To bring about the diameter of the cylinder jacket 6, it must be by means of an adjusting device 47 can be expanded. This adjustment device 47 includes, among others Adjustment device 18, the actuating part 12 and the force deflection device 35. In the same It is possible that the cylinder jacket 6 is made with the largest radius, the Cylinder jacket for setting a smaller diameter by a not shown corresponding adjustment device is contracted.

Should - to adapt to the substrate thickness - the diameter or the radius r of the cylinder 5 can be enlarged, for example set to the largest radius R. are, this is done by turning the adjusting knob 23. While in Figure 3 the The smallest diameter of the cylinder 5 is shown in FIG. 4 largest possible diameter of this cylinder. By turning the Adjustment knob 23, the threaded spindle 19 deeper into the threaded bore 20th screwed, whereby the adjusting ring 13 in a radial way, namely in the Plane of symmetry 7 is shifted relative to the cylinder body 11. This leads to that the outermost point 48 by a certain amount, for example by the amount R 'in the Figure 4 shifted downward, so that - starting from the axis of rotation 4 - Radius R sets. The two swivel simultaneously with the radial displacement movement Angle levers 37 around their bolts 45, since their end regions 39 are on the lateral surface support of the cylinder body 11 and their by the displacement movement mentioned Bearing points (bolts 45) move downwards so that the left side of the plane of symmetry 7 located angle lever 37 a pivotal movement counterclockwise and the Angle lever 37 located on the right side of the plane of symmetry 7 pivots in Clockwise direction. Because of the symmetrical relationships, both are Swing angle of the angle lever 37 is the same size. Press through the swivel movement the rollers 42 the respective end regions 44 of the cylinder jacket 6 to the outside, wherein due to the choice of the cross-sectional configuration of the cylinder jacket and the selected materials sets an elastic deformation such that the Outer jacket surface 46 of the cylinder jacket 6 continues to have the shape of a Pitch circle has. It is possible to deviate from a mathematical one Keep the pitch circle within very narrow limits. It can, for example, be in the area the outer point 48 a diameter difference of ≤ 0.04 mm and a roundness from 0.07 to 0.1. Because of the linear radial adjustment according to the invention by means of the adjusting device 18 it is thus possible to apply the entire cylinder jacket 6 to act, which has only a few support points, which for a Diameter adjustment exert a force on the cylinder jacket 6. Of the Cylinder jacket 6 is intrinsically rigid, that is, it only requires the named ones few support points and yet exhibits sufficient mechanical Strength and above all has those optimized for the shape (pitch circle shape) Characteristics. A linear adjustment is preferably implemented, that is to say with one Radial offset along the plane of symmetry 7 by a certain path results a corresponding widening of the diameter, the radial adjustment path and the A widening of the diameter over the entire adjustment range Own relationship.

Should - based on the position shown in Figure 4 - again a smaller diameter of the cylinder 5 can be adjusted, so the adjusting knob 23 in the opposite Rotated direction, whereby the sliding ring 25 - according to the position shown in Figure 4 - raises the adjusting ring 13 relative to the cylinder body 11. this leads to on the one hand to a "hiking up" of the extreme point 48 and to corresponding pivoting movements of the two angle levers 37.

FIG. 5 shows a side view of the configuration according to FIG. 3 or 4, it being clear that the adjusting device 47 at the front end of the Cylinder 5 is located. 5 shows a center line 49 of the cylinder 5, the center line 49 also forms the center line of the rotary printing press. Beyond the Center line 49 is also on the other side of cylinder 5, not shown an adjusting device 47.

FIG. 6 shows, in a schematic representation, a further exemplary embodiment of the Invention, for simplicity only the differences from the embodiment of the previous figures are explained. The cylinder body 11 has in the Embodiment of Figure 6 has a relatively large diameter, it is almost as large as the outer diameter of the adjusting ring 13. In this respect, the two parts are one behind the other - in Considered the longitudinal direction of the axis of rotation 4. The adjusting ring 13 has one edge-open recess 50 in each of the two upper quadrants through the Planes of symmetry 7 and 8 formed arrangement, being in the open edge Recess 50 opens a control groove 51 of the adjusting ring 13. By means of a bolt 52 a toggle lever 53 pivotally mounted on the cylinder body 11, the one in its End portion 54 carries a roller 55 engaging in the control groove 51 and in its other End region 56 has a spherical contact surface 57, which is located on a projection 58 of the Cylinder jacket 6 supports. The projection 58 goes from the inner surface 43 of the Cylinder jacket 6 and runs in the radial direction.

Is carried out by means of the setting device 18, not shown in FIG. 6 Radial displacement of the adjusting ring 13 relative to the cylinder body 11, so by Engagement of the roller 55 in the control groove 51 of the angle lever 53 pivoted about the bolt 52, so that the end region 56 onto the approximately radially extending outer surface of the projection 58 acts in such a way that, in accordance with the illustration in FIG. 2-, a moment M is transmitted 3, 4, forces have been exerted on the cylinder jacket 6 acted and in the embodiment of Figure 6, no force is applied, but a momentary application, which leads to another bending line of the Cylinder jacket 6 leads. By means of the configuration according to the invention, everyone can necessary surfaces of the cylinder 5 are generated by, for example Chrome foil, Super Blue ® or glass bead cloth with appropriate clamp and Clamping devices are attached to the cylinder jacket 6. As an alternative to those in the Embodiments shown in the figures, it is also possible to shape the cylinder to form several segments, that is, the cylinder jacket 6 is not in one piece formed, but in several pieces, one area being attached and another Area is deformed elastically by a force deflection device. Unless relatively large Diameter to be realized, it is also possible to use more than two levers each Provide adjustment device 47. The invention also allows the ideal Circular shape deviating cylinder surfaces, for example spherical cylinder surfaces, to accomplish. This is possible because seen in the axial direction of the cylinder 5 additional adjustment mechanisms are provided, that is, not only in the end areas. Preferably, several adjustment devices can be used by means of suitable gears be coupled with each other, so that at the same time an automatic adjustment of all Adjustment mechanisms take place. To stiffen the cylinder jacket 6, for example by to avoid an undesired deflection parallel to the axis of rotation 4 Stiffening ribs can be arranged on the inner surface 43.

Furthermore, it can be provided to deform the cylinder jacket 6 instead of described lever and roller eccentric or equivalent, the same or to use a similar deformation causing gear.

Claims (11)

1. Sheet-guiding cylinder of a rotary printing machine (1), the outer diameter of said sheet-guiding cylinder, because of an elastically deformable, semicircular, intrinsically rigid cylinder jacket (6), being variable by means of an adjustment device (47) acting on the cylinder jacket (6),
   characterised in that the adjustment device (47) has a positioning part (12) supported on and radially displaceable relative to the inner cylinder body (11) for shifting the cylinder jacket (6) jointly therewith in the same radial direction, and that a travel distance derived from the radial displacement forms the positioning travel distance for a force deflector (35) associated with the adjustment device (47), said force deflector (35) acting upon the end regions (44) of the cylinder jacket (6) so as to deform it.
2. Cylinder according to Claim 1,
   characterised in that the cylinder jacket (6) is secured to the positioning part (12).
3. Cylinder according to anyone of the preceding claims,
   characterised in that the cross-sectional contour of the cylinder jacket (6) is constructed symmetrically to a radially extending plane of symmetry (7).
4. Cylinder according to Claims 2 and 3,
   characterised in that the cylinder jacket (6) is secured to the positioning part (12) in the vicinity of the plane of symmetry (7).
5. Cylinder according to anyone of the preceding claims,
   characterised in that the cylinder body (11) has a circular-cylindrical cross-section.
6. Cylinder according to anyone of the preceding claims,
   characterised in that the positioning part (12) is supported on the cylinder body (11) by means of sliding blocks (15) braced against the cylinder body (11).
7. Cylinder according to Claims 3 and 6,
   characterised by respectively two sliding blocks arranged symmetrically to the plane of symmetry.
8. Cylinder according to anyone of the preceding claims,
   characterised in that the force deflector (35) has double levers (36) pivotally supported on the positioning part (12), the respective one, first lever arm (38) of the double levers (36) cooperating with the cylinder body (11) and the respective other, second lever arm (40) of the double levers (36) acting upon the cylinder jacket (6).
9. Cylinder according to Claim 8,
   characterised in that the double levers (36) are constructed as bell cranks 37, 53).
10. Cylinder according to anyone of the preceding claims,
    characterised in that the force deflector (35) is acting upon the cylinder jacket (6) with forces (F) and/or torque (M).
11. cylinder according to anyone of the preceding claims,
    characterised in that the cross-section of the cylinder jacket (6) tapers towards its end regions (44).

Images