DE102009001338A1 - Printing unit for offset printing machine, has cylinders formed in manner that cover body of cylinder is coupled with bearer rings by coupling structure so that cover body is displaced opposite to rings along circumferential direction - Google Patents

Abstract

The unit has a cylinder (1) including a cover body (2) and provided with bearer rings (3, 4) at a region of axial ends of the cylinder. Another cylinder (5) comprises a cover body (6), and is provided with bearer rings (7, 8) at a region of axial ends of the cylinder. One of the cylinders is formed in a manner that the cover body of cylinder is coupled with the rings by a coupling structure (13) so that the cover body is displaced opposite to the rings (3, 4, 10, 11) along circumferential direction. The structure is implemented by electromagnetic actuating drive and a friction clutch. An independent claim is also included for a method for changing alignment of a printing unit.

Description

Field of the invention

The The invention relates to a printing unit for an offset printing press, the at least one first cylinder and a second cylinder having, these two cylinders via so-called. Schmitz rings to each other roll. Furthermore, the invention is also directed to a method to change one for the print result relevant printing unit setting.

Background of the invention

at So-called Schmitzringläufer printing units are in the region of the axial ends of the printing cylinder which rolls against each other Ring elements provided which are referred to as bearer rings. These bearer rings are typically designed so that their Diameter of the pitch diameter of the cylinder associated Cylinder gears equivalent. The bearer rings of a pair of cylinders become common with a relatively high radial biasing force urged against each other, wherein under this radial biasing force a certain frictional coupling the cylinder yields. If this frictional coupling canceled by excessive circumferential forces It may be at the Schmitzringen to one for the further printing result adverse wear come.

Object of the invention

Of the Invention has for its object to provide solutions by which it possible is, in a printing that as such rolling over a bearer rings Cylinder pair has advantages in terms of performance to achieve.

Inventive solution

• – einem ersten Zylinder, der einen Mantelkörper umfasst und im Bereich seiner beiden Axialenden jeweils mit einem Schmitzring versehen ist und,
• – einem zweiten Zylinder, der ebenfalls einen Mantelkörper umfasst und im Bereich seiner beiden Axialenden jeweils mit einem Schmitzring versehen ist, wobei die beiden Zylinder über jene Schmitzringe aneinander abrollen, wobei sich dieses Druckwerk dadurch auszeichnet, dass wenigstens einer der Zylinder derart ausgebildet ist, dass der Mantelkörper desselben vermittels einer Koppelungsstruktur gegenüber den zugeordneten Schmitzringen in Umfangsrichtung verlagerbar ist.

This object is achieved by a printing unit for an offset printing machine with:

• A first cylinder, which comprises a jacket body and is provided with a bearer ring in the region of its two axial ends, and
• - A second cylinder, which also comprises a jacket body and is provided in the region of its two axial ends each with a bearer ring, the two cylinders roll over those bearer rings together, this printing is characterized in that at least one of the cylinders is designed such that the jacket body thereof by means of a coupling structure relative to the associated bearer rings in the circumferential direction is displaceable.

Thereby is it possible in an advantageous manner the printing length change by adjustment of the jacket body compensate for this and the correction of the print length a To avoid relative movement on the bearer rings. By avoiding this Relative movement on the bearer rings prevents wear of the contact surfaces. In a particularly advantageous manner, it is possible, the Angular position of the jacket body to change without in this case the coupling moment generated by the bearer ring contact being overcome got to. About that In addition, the amplitude of torsional vibrations can be reduced and thus the risk of banding be countered.

The Schmitzringe are advantageously rotationally fixed with the over respective cylindrical gear driven shaft connected. The lateral surface is preferably provided by a structural component between the bearer rings rotatably mounted on a core shaft or the cylinder main body is. In the relative rotation of the lateral surface, the frictional forces of Schmitz rings not overcome become.

It is possible, to compensate for torsional vibrations and the associated Relative movements between the cylinder surfaces to induce movement of the cylinder surface. Also tangential relative movements between the cylinder surfaces, the caused by translational movements (eg bending vibrations), can by implementing the inventive concept at least partially be compensated.

The provided for the kinematic coupling of the bearer rings and the sheath body coupling structure can highly dynamically activatable actuator, in particular piezo-mechanical Actuator executed be. The coupling structure can also be connected via a curve system, in particular via a curve system be arranged frame side arranged eccentric.

Furthermore, it is also possible to carry out the coupling structure as an actuator. The actuator can be designed so that this causes a highly rigid coupling of the bearer rings with the sheath body. The actuator can also be designed so that a relatively short, but sufficient for typical corrective action adjustment is feasible. The actuator may comprise a clutch whose engaged state is temporarily canceled. After canceling the engagement state, a corresponding change in the circumferential position of the jacket body relative to the bearer rings can then take place. In this embodiment, the adjusting mechanism can be designed so that it only generates the required actuating forces for position change, wherein the in operation occurring loads are transmitted after engagement of the clutch of this.

Of the Actuator can be advantageous as an electromechanical actuator accomplished become. This actuator can be integrated directly into the cylinder become.

Farther it is also possible the coupling structure as a pure coupling, in particular as a friction clutch perform. This friction clutch can be designed so that this as a damping system acts by which a certain damping of vibrations in Circumferential direction is achieved.

Of the Cylinder may be designed to include a core shaft, the shell body on this core shaft is mounted in such a way. This storage is preferred designed so that the shell body across from the core shaft in the circumferential direction without radial play pivotable is.

It is possible, the coupling characteristic of the coupling structure and the moment of inertia of jacket body to tune to a vibration excitation spectrum of the printing press such that Torsional vibrations within the cylinder, and between the shell body and the drive train is counteracted.

Of the Actuator can be designed so that a change in the position of the jacket body over the Core shaft can be made in the current printing operation. So far a change in Machine downtime is made, preferably arrangements hit by which the printing unit is moved into a phase position, in which a plate or sheet gripper channel in the nip located.

Brief description of the figures

Further Details and features of the invention will become apparent from the following Description in connection with the drawing. It shows:

1 a schematic diagram illustrating a printing unit in which a rotation of the shell body of at least one cylinder relative to the associated bearer rings is made possible.

Detailed description of the figures

In 1 is greatly simplified a printing unit for an offset printing machine shown. This printing unit comprises a first cylinder 1 who has a coat body 2 includes and in the region of its two axial ends each with a bearer ring 3 . 4 is provided.

The printing unit further comprises a second cylinder 5 , who also has a coat body 6 includes and also in the region of its two axial ends each with a bearer ring 7 . 8th is provided, wherein the two cylinders roll over those bearer rings together. In the embodiment shown here, the second cylinder acts as a rubber cylinder.

The printing unit comprises a printing cylinder 9 which is designed here as a double-sized cylinder. Also this impression cylinder 9 is in the area of its axial ends with bearer rings 10 . 11 Mistake.

The printing unit according to the invention is characterized in that at least one of the cylinders (here the cylinder 1 and 9 ) is formed such that the jacket body 2 respectively. 12 the same with the associated bearer rings 3 . 4 . 10 . 11 via a coupling structure 13 . 14 is coupled such that the jacket body 2 . 12 opposite the associated bearer rings 3 . 4 . 10 . 11 is displaceable in the circumferential direction.

The coupling structure 13 . 14 can be designed as a particular electromechanical actuator, or as a pure, temporarily releasable coupling device.

In the embodiment shown here, the coupling device is designed as a switchable, temporarily releasable friction clutch. The coupling structure is integrated in an assembly which also carries the respective bearer ring. This assembly can via a ring bushing housing on the respective core shaft 15 . 16 of the cylinder 1 . 9 be put on. This ring bush housing can then with the associated core shaft 15 . 16 rotatably coupled. The power flow of the introduced into the core shaft drive torque then passes into that ring bushing housing 17 . 18 and from there into the corresponding bearer ring 3 . 4 . 10 . 11 , The coupling structure 13 . 14 can be designed so that over this both a coupling of the respective jacket body 2 . 12 with the ring bush housing 17 . 18 as well as with the associated bearer rings 3 . 4 . 10 . 11 he follows. The coupling structure can be designed as a multi-plate clutch having alternately with the sheath body and the ring bushing housing (or even directly with the core shaft) in engagement clutch plates. This coupling structure can be spent by axial relief of the disk pack in a release state of a rotation of the sheath body 2 . 12 opposite the respective core shaft 15 . 16 allowed.

The coupling structure 13 . 14 can so ge staltet be that can be accomplished by this only small and contributing to the print image optimization changes in the circumferential position. The coupling structure 13 . 14 , End stops here may include the impermissibly large changes in the circumferential positions of the sheath body 2 . 12 opposite the associated core shaft 15 . 16 avoid.

Furthermore, the coupling characteristic of the respective coupling structure 13 . 14 and the moment of inertia of the respective jacket body 2 . 12 are tuned to a vibra tion excitation spectrum of the printing press such that torsional vibrations between the cylinders is counteracted.

Preferably, the printing unit is designed so that for changing the position of the jacket body 2 . 12 opposite the core shaft 15 . 16 the printing unit is movable in a phase position in which there is a plate or sheet gripper channel in the nip W1, W2.

The printing cylinder 1 . 5 and 9 are in the embodiment shown here in a conventional manner via cylindrical gears 19 . 20 . 21 , coupled with each other. The connection of the plate cylinder 1 on the cylinder gear 19 , as well as the connection of the (here by way of example doubly large) printing cylinder 9 on the cylinder gear 21 is through a disconnect clutch 22 . 23 accomplished. About these disconnect couplings 22 . 23 a register setting can be made. Furthermore, it is possible, via these disconnect couplings 22 . 23 for the nuclear waves 15 . 16 Register positions that allow the coupling devices 13 . 14 to spend in basic positions ensure a sufficient Vorstellweg, as well as a sufficient return path.

Claims (11)

Printing unit for an offset printing machine with: - a first cylinder, which comprises a jacket body and is provided in the region of its two axial ends each with a bearer ring and, - a second cylinder, which also comprises a jacket body and also in the region of its two axial ends each with a bearer ring is provided, wherein the two cylinders roll over those bearer rings to each other, wherein this printing unit characterized in that at least one of the cylinders is formed such that the jacket body thereof is coupled to the associated bearer rings via a coupling structure such that the jacket body relative to the associated Schmitzringen is displaceable in the circumferential direction. Printing unit according to claim 1, characterized that coupling structure is designed as an actuator. Printing unit according to claim 2, characterized that the actuator is designed as an electromechanical actuator. Printing unit according to claim 1, characterized that the coupling structure is designed as a friction clutch. Printing unit according to at least one of claims 1 to 4, characterized in that the coupling state in verbauter Position temporary can be canceled. Printing unit according to at least one of claims 1 to 5, characterized in that at least one of the cylinders with a core shaft is provided, and that the shell body on this core shaft is mounted such that the jacket body against the Core shaft is pivotable in the circumferential direction. Printing unit according to at least one of claims 1 to 6, characterized in that the coupling characteristic of Coupling structure and the moment of inertia of the jacket body tuned to a vibration excitation spectrum of the printing press such are that torsional vibrations between the cylinder counteracted becomes. Printing unit according to at least one of claims 1 to 7, characterized in that for changing the position of the jacket body relative to the core shaft the printing unit is movable in a phase position in which there is a plate or sheet gripper channel in the nip. Procedure for change the setting of a printing unit the one pair via bearer rings together having rolling cylinders, characterized in that to change the peripheral relative position of the cylinder jackets a rotation of the opposite Schmitzringen pivotally mounted shell body is made. Method according to claim 9, characterized in that that rotation is highly dynamic in the current printing operation. Method according to claim 10, characterized in that that that twist occurs within a print cycle by an amount that's a bow length increase compensated.