The invention relates to the printing unit of a printing machine according to the preamble of claim 1.
Printing machine of this kind is known from the DE 197 05 369 A1. In that design, the pressure and ink transfer rollers are supported on their first ends, each with overhanging one end in a bearing block supported by guide rails. In order to avoid vibrations of the rollers during the press operations, their second ends are supported with the help of prop bearings, which, in their turn, are mounted on the bearing blocks. The prop bearings can be released from the rollers and can move together with the bearing blocks. Thus, the second, free ends of the rollers can be released, for example, for the purpose of changing the sleeves or for other tasks. Since the bearing blocks carrying the prop bearings must be moved, but the bearing blocks in which the rollers are supported overhanging are held fast, it is also necessary to release the blade chamber which connects both the bearing blocks, or the blade chamber holder of the bearing block, which carries the prop bearing. For that purpose, in the known types of printing machines, in the printing position of the bearing block, pins are inserted into the bore holes interspersed in the bearing blocks that carry the prop bearing, which also grip tapped blind holes made in the blade chamber holder of the coater chamber. Now, if this bearing block is to be moved, the fixed connection between blade chamber holder and bearing block are separated by taking out the pins. The disadvantage of such a device is that the blade chamber holder is then supported by the printing machine frame,
whereby the blade chamber buckles through due to the distance between blade chamber holder and the printing machine frame. At the same time it can also result in slipping movements in case of printing units not built in horizontal position, so that damage to the ink transfer roller cannot be ruled out.
Therefore the task posed by the present invention is to propose an arrangement for the printing unit, in which possible displacement and buckling of the blade chamber are avoided after loosening the fixed attachment with the bearing block.
This task is solved by permanently propping up the blade chamber holder associated with the second bearing block by means of supporting elements on the second bearing block. Therefore, the blade chamber holder does not need to be completely released from the second bearing block. The blade chamber and the blade chamber holder supporting it need no longer be set down on the printing machine frame. Furthermore, the manual work connected with the loosening and retightening of the connections between the blade chamber holder and the bearing block need not be done any more.
Thereby, it is especially advantageous if the supporting elements consist of at least a linear guide, which are attached to the blade chamber holder in such a fashion that the second bearing block is displaceable relative to the blade chamber holder. In that manner, the bearing block can be displaced without causing deformation of the blade chamber due to the lifting and the lowering movements.
It is of advantage if the supporting elements are comprised of a track fixed on the blade chamber holder and a guiding slot is firmly connected with the bearing block. It is thus possible to move the bearing block relative to the blade chamber holder for releasing the free end of the printing roller without needing to completely separate the blade chamber holder from the bearing block.
Should the bearing block be brought into the release position, then, in a preferred embodiment, the blade chamber holder is arrested in the printing unit frame. With that the buckling of the blade chamber as a result of slipping at an end side of the printing unit that is not horizontally arranged is avoided and consequently possible damage to the surface of the ink transfer roller are forestalled.
Thereby, it is especially advantageous if the blade chamber holder is alternately attached with the bearing block or the printing unit frame. For that purpose, it can be equipped with a stop bolt attached displaceably with the blade chamber holder, which connects the blade chamber holder firmly at one of its end positions with the bearing block and at its other end position, it grips into a recess of the printing device frame.
In order to rule out releasing of the stop bolt from the described end position by accident, it is advantageous to provide an elastic thrust pad on the blade chamber holder. Thereby the ball of the elastic thrust pad grips a groove made in the stop bolt.
In order to ensure a tight fit between the blade chamber holder and the anilox roller block, it is of advantage if a stop plate is fixed on the anilox roller block, which can be clamped between the stop bolt and a stopper.
In order to prevent the play that appears after frequent displacement of the stop bolt between the stopper plate and the stop bolt, in a preferred embodiment, both the elements are provided in the mutually facing areas with mutually parallel slant, so that the play due to the changes in the distance adjustment of the stop bolt is eliminated.
If the blade chamber holder must be fixed on a printing unit frame, it is of advantage to equip it with a receiver fixed on the printing unit frame for that purpose.
It is of advantage if a means for actuating displacement can act on the stop bolt.
In a preferred embodiment, the means for the displacement of the stop bolt is comprised of a drive unit, as well as a means for transmitting the driving force.
Thereby a piston cylinder unit can be provided as the drive unit.
It is of advantage thereby if the means for transmitting the drive force is comprised of a receiver attached to the piston of the piston cylinder unit, which encloses a pin fixed on the stop bolt in the print position of the anilox roller block. It is thus possible to provide the piston cylinder unit on the anilox roller block. This type of arrangement offers the advantage that the leads to the driver of the piston cylinder unit can be laid parallel to other devices located, driven or actuated through the anilox roller block.
An instance of an embodiment of the invention is explained in detail with the help of the drawings. The individual figures show:
The anilox roller 27 is supported raster roller bearing block 4 by a prop bearing 6. The sled 9, which runs along the track 8 fixed on the printing unit frame 2 and on which the anilox roller bearing block 4 is held fast, can be displaced, along double arrow A, by means of the motor 10 and the spindle 11. An ink chamber coater blade 31 is fixed on the blade chamber holder 16 in a manner not further described in detail here. This blade chamber holder 16 is fastened to the anilox roller block 4, in a manner secured against twists and movements, using two bolts 17, which grip through bore holes in the anilox roller bearing block 4 and grasp into the two bore holes of the blade chamber holder.
Now, in order to be able to remove, for example, the anilox roller sleeve from the cylinder core of the anilox roll, first the anilox roller block is detached from the printing roller (Printing-Off position). After that, the raster roller frame 4 must be displaced relative to the anilox roller 27 after releasing the prop bear 6 from the anilox roller 27. For that purpose, the blade chamber holder 16 must be separated from the anilox roller bearing block 4 by pulling out both the bolts 17. After the separation, the anilox roller block 4 can be moved into the so-called Release position.
Now, the FIGS. 2 to 4 show a section of the printing unit according to the invention. Display of the anilox roller bearing block 4 with the prop bearing as well as the guide elements is not shown in
The FIGS. 5 to 7 show the same section of the printing unit according to the invention, whereby the anilox roller bearing block 4 is in the printing position. In order to reach this position, the anilox roller bearing block 4 is displaced in the direction toward the anilox roller 27, so that the prop bearing 6 can enclose the free end of the anilox roll. In that position of the anilox roller block, the receiver 34 mounted on the piston 33 also enclosed the pin 20 fastened in the stop bolt 19. Through actuation of the piston cylinder unit 32, the
stop bolts can be displaced upwards and thereby clamp the jut 39 of the stopper plate between the stopper 23 and the stop bolt head 24. A constant application of pressure exerted through the piston cylinder unit 32 ensures, due to the slants of the jut 39 and the cylinder head 38, clamping of the jut 39 free of play. Thus a reproducibly exact position of the blade chamber holder relative to the anilox roller block is enabled. However if, in a faulty operation, the pressure exerted by the piston cylinder unit 32 is absent, the stop bolts 19 can slide into a position, in which, as shown in
Number | Date | Country | Kind |
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103 04 109.5 | Jan 2003 | DE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/EP04/00413 | 1/14/2004 | WO | 7/13/2005 |