This is a nationalization of PCT/EP03/04952 filed May 12, 2003 and published in German.
1. Field of the Invention
The present invention relates to the design of inking systems for flexographic printing presses. These inking systems are equipped with an anilox roller and a printing plate roller. These two rollers are involved in the color transport during the printing process. The two aforementioned rollers carry, as a rule, sleeves which must be replaced, in particular when changing jobs.
For this purpose, the inking systems are provided with setting devices with which the position, relative to the impression cylinder, of these two rollers involved in color transport can be set. In addition, the positions, relative to one another, of the two rollers involved in color transport can be set.
For this purpose, bearing blocks, in which the axles of the two rollers involved in color transport are mounted, are traversed. For this, each of the bearing blocks of a roller can be mounted on carriages which slide on suitable guides. There are inking systems in which the carriage of one roller slides on guides which are mounted on the carriage of the other roller. In the case of other inking systems, both rollers can be traversed completely independently of one another.
The force necessary for setting the position of the two rollers involved in color transport is prepared, as a rule, by spindles, which engage through an inner thread present in the bearing blocks, and which are turned by motors.
2. Description of the Related Art
Such a device is, for example, known from EP 0955161 A2. This publication shows an inking system in which the motors, which turn the spindles and apply the force necessary for position setting in the manner described above, are mounted on the machine frame on the side (turned away from the impression roller) of the two rollers involved in color transport.
Moreover, devices are known in which the motors which make possible the setting of the position of the printing plate roller are located on the inking system's side turned toward the impression cylinder while the motors which move the anilox roller are provided on the side of the rollers that is turned away from the impression cylinder.
The positioning of the motors on the impression cylinder's side turned away from the impression cylinder, however, causes a large structural length of the inking system.
The objective of the invention thus consists of proposing an inking system design which permits a reduction of the structural length of the inking system.
This objective is realized with the present invention by the fact that all the motors are mounted on the machine frame on the side of the two rollers involved in color transport turned toward or nearest the impression roller.
By machine frame, any machine components suitable for fastening are to be understood. The inking system's more compact mode of construction according to the present invention also leads to a reduction of the vibrations to which the rollers are subjected during the printing process. It is advantageous if the bearing block or blocks, which bear the axle of the anilox roller and the bearing block or blocks which bear the axle of the printing plate roller can be moved on different guides. In particular, guides set to different vertical positions from one another make possible a simpler positioning of the spindles in the inking system.
A particularly preferred development of the present invention is characterized by the positioning of the guides relative to the rollers such that the guides which bear the axle of one of the two rollers involved in color transport are disposed over these rollers, while the guides which bear the axle of the other roller involved in color transport are mounted under this roller.
In this way the motors and spindles which are assigned to the two rollers are spaced vertically in a simple manner so that their arrangement in the inking system causes no problems.
Additional embodiment examples of the invention follow from the description and the claims.
The individual figures show:
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
The figures show an embodiment example of an inking system 3 according to the present invention, in which inking system the positioning elements 21, 22, 23, 24, 25 assigned to the printing plate roller 20 are mounted below the printing plate roller 20 while the positioning elements 11, 12, 13, 14, 15 of the anilox roller 10 are disposed above the anilox roller 10. In this way the anilox roller 10, the axle-carrying bearing block 15, and the carriage 14 on which the bearing block 15 is mounted, are suspended on the guide bar 13. The force necessary for movement of the carriage in the direction indicated by the arrow A is provided by the motor 11 turning the spindles 12, which engage through an inner thread 17 provided in the bearing block 15.
Analogously to the design of the positioning elements 11, 12, 13, 14, and 15 for the anilox roller 10, the axle of the printing plate roller 20 is borne by the bearing block 25 which is mounted on the carriage 24. The carriage 24 slides in the direction predefined by the arrow B on the guide bar 23 if the spindle 22 is moved by the motor 21.
In the embodiment example represented, all the aforementioned positioning elements 11, 12, 13, 14, 15, 21, 22, 23, 24, 25 are carried by the machine frame 2. At the left edge of the picture of
The invention being thus described, it will be apparent that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be recognized by one skilled in the art are intended to be included within the scope of the following claims.
Number | Date | Country | Kind |
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102 23 66 | May 2002 | DE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/EP03/04952 | 5/12/2003 | WO | 00 | 8/30/2004 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO03/099567 | 12/4/2003 | WO | A |
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Number | Date | Country | |
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20050211117 A1 | Sep 2005 | US |