The invention concerns a printing machine, preferably a flexoprinting machine, with at least one counter-pressure cylinder and with at least one printing roller fitted with one adapter sleeve and/or with one enveloping sleeve, wherein the bearings of the printing roller are conveyable in guideways relative to the counter-pressure cylinder and a bearing is provided to underprop the shaft extension of the free end of the printing roller.
Such a printing machine, for example, is known from the German patent DE 197 05 369 A1, in which the bearing block with the underprop bearing for the printing roller is conveyable in the printing machine frame transverse to the printing roller, so that the taper bore mounted printing roller is clearly accessible from one side, for example, through a window on the side stand of the printing machine frame, so that an enveloping sleeve and/or an adapter sleeve for the enveloping sleeve can be pushed out and fitted on.
For example, in order to separate enveloping sleeves covered with cliches and/or adapter sleeves from one another, and/or to push them off of a printing roller and then to be able to slide them back on again, it is known, for example, from the German patents DE 198 46 677 A1 and DE 200 10 068 A1, that said enveloping sleeves and/or adapter sleeves can be hydraulically expanded or contracted by the use of compressed air. In spite of the possibility of expanding the enveloping sleeves and/or adapter sleeves for the purpose of fitting them on and off, considerable means of force are expended to this end.
The task of the invention is therefore to create a printing machine of the type described in the introduction, in which the enveloping sleeve and/or the adapter sleeve can be pushed off from the printing roller in a simple manner.
In accordance with the invention, this task is resolved in that, for the purpose of changing the relative position of the adapter sleeve and/or of the enveloping sleeve and of the printing roller in the bearing block, in which the printing roller is taper bore mounted, parallel to the center line of the printing roller, there is at least one shaft, but preferably there are two shafts, mounted to be longitudinally displaceable and rotatable, said shafts carrying radial gripping arms on their inner ends that are oriented toward the printing roller.
The radial arms are purposefully provided with thrust pieces on the end faces.
The shafts can be rotatably supported on their outer ends by a carrier bracket and can be provided with a rotary drive.
The carrier bracket is purposefully provided with a drive for the purpose of making it slide relative to the bearing block.
The task described above is thereby resolved in the case of a printing machine, preferably of a flexoprinting machine, with at least one counter-pressure cylinder and with at least one printing roller, which on one end is taper bore mounted in the frame, wherein the bearings of the printing roller are conveyable in guideways relative to the counter-pressure cylinder and a bearing is provided to underprop the shaft extension of the free end of the printing roller, in that, in accordance with the invention, in the bearing block in which the printing roller is taper bore mounted, parallel to the sleeve line of the printing roller, two shafts are mounted to be longitudinally displaceable and rotatable, which carry on their inner ends that are oriented toward the printing roller radial arms with end face thrust pieces, that the shafts are mounted on their outer ends to be rotatable in a carrier bracket and are provided with a rotary drive, and that the carrier bracket is provided with a drive that makes it conveyable relative to the bearing block.
In the printing machine in accordance with the invention, after the withdrawal of the underprop bearing from under the free end of the taper bore mounted printing roller, an enveloping sleeve and/or an adapter sleeve can be pushed off from said printing roller in a simple manner, in that the thrust pieces are brought into an appropriate emplacement on the end zones of the enveloping sleeve and/or of the adapter sleeve by axial traverse and radial swing, so that subsequently, by axial traverse of the thrust pieces relative to the printing roller, the enveloping sleeve and/or the adapter sleeve can be pushed off of the printing roller.
Advantageously, the rotary drive comprises a piston cylinder pressure medium unit whose cylinder and piston rod are respectively linked on the ends of the radial levers of the shafts. In this fashion, the radial levers are endowed with a clamp-like opening or closing movement in a simple manner.
Preferably, the drive conveying the carrier bracket in the axial direction relative to the printing roller comprises at least one piston cylinder pressure medium unit whose ends engage down on the carrier bracket and on the bearing block.
According to a further developed embodiment of the invention, it is provided that a piston cylinder pressure medium unit with a short stroke cylinder and a piston cylinder pressure medium unit with a long stroke cylinder are coupled with one another and the outer faces are connected to the carrier bracket on the one side and to the bearing block on the other side. In this design, the short stroke cylinder serves to apply the thrust pieces in the proper position on the enveloping sleeve and/or on the adapter sleeve, and the long stroke cylinder serves to push off the enveloping sleeve and/or the adapter sleeve from the printing roller and given the case, to also fit them on.
To facilitate a mode of construction that is as short as possible, the long stroke cylinder is purposefully mounted in a bore on the bearing block.
The thrust pieces are purposefully adapted to the form of the enveloping sleeve and/or of the adapter sleeve to be pushed off of the printing roller.
For pushing off and also for fitting on the enveloping sleeve or the adapter sleeve on to the printing roller, the enveloping sleeve can be provided with an annular T-slot on its end zone oriented toward the bearing block, upon which the printing roller is taper bore mounted, and the thrust pieces can be provided with keys that engage into this annular T-slot.
An exemplary embodiment of the invention is more closely detailed by way of a drawing in the following. Shown there in
In
As shown in
In the bearing block 11, beneath the printing roller 10, are the shafts 17, 18, parallel to one another and distanced apart and guided to be longitudinally displaceable and rotatable, and mounted symmetrically on a vertical plane, intersecting the center line of the printing roller 10. Tong-like radial arms 20 are unrotatably secured on the front ends 19 of the shafts 17, 18 penetrating the bearing block 11, whose freely upward projecting ends carry jaws in the form of thrust pieces 21.
The back ends of the shafts 17, 18 are rotatably mounted in a plate-shaped carrier bracket 22, but are axially undisplaceable. On the rear shaft extensions of the shafts 17, 18, penetrating the carrier bracket 22, are radial levers 23 unrotatably secured, on whose free ends the cylinder 24 is mounted on the one side and the piston rod 25 on the other, both of a piston cylinder pressure medium unit. Secured on the carrier bracket 22 is the short stroke cylinder 26 of a piston cylinder pressure medium unit, whose piston rod 27 is connected by a coupling piece 28 to the piston rod 29 of a long stroke cylinder 30 of a piston cylinder pressure medium unit, said long stroke cylinder being secured in a bore 31 of the bearing block 11.
The jaws or the thrust pieces 21 carry padded or cushioning pieces 22 on their ends that serve for the gentle emplacement of the thrust pieces on the enveloping sleeve 14 or on the adapter sleeve 15.
In the position shown in
In accordance with
In the exemplary embodiment in accordance with
In accordance with the exemplary embodiment as per
The side registration of the printing mechanism can also be used for adaptation in cases where the short stroke cylinder 26 should not suffice for the adaptation of the thrust pieces 21 on to the enveloping sleeves or adapter sleeves.
Number | Date | Country | Kind |
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102 20 608.2 | May 2002 | DE | national |
Filing Document | Filing Date | Country | Kind |
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PCT/EP03/05064 | 5/8/2003 | WO |