GB2312647A

GB2312647A - Rollers,particularly inking rollers for printing presses

Info

Publication number: GB2312647A
Application number: GB9708706A
Authority: GB
Inventors: Peter Hummel; Robert Ortner
Original assignee: MAN Roland Druckmaschinen AG
Current assignee: Manroland AG
Priority date: 1996-04-30
Filing date: 1997-04-29
Publication date: 1997-11-05
Anticipated expiration: 2017-04-29
Also published as: DE19617275C1; GB2312647B; GB9708706D0; FR2747942B3; FR2747942A1

Description

2312647 ROLLERS, PARTICULARLY INKING ROLLERS FOR PRINTING PRESSES This

invention relates to a roller, particularly for use as an inking roller for a printing press, with a roller tube mounted on both sides which has several channels arranged adjacent or in the tube walling next door to one another wherein, in each case, two neighbouring channels are connected together at their one end and the other end of one of the two channels to the feed and the other to the return of a supply device for a tempering agent# and wherein the connection of the channels to the feed and return take place via axial channels in one axial trunnion of the roller and via individual radial channels in the end face of the roller.

A roller of the type given is known from DE 35 21 424 Cl. In this, the radial channels are formed by radial bores arranged axially offset in the end face of the roller, into which axial connection bores open which connect the radial bores with the channels in the roller tube. This known configuration is unfavourable from the point of view of flow technology and expensive in manufacture.

The object underlying the invention is to improve the feed and feed away of the tempering agent in a roller of the initially known type in flow technical fashion and accordingly to increase the efficiency of tempering. Furthermore, the manufacturing costs ought to be lowered. 5 In accordance with the invention, there is provided a roller consisting of a roller tube and axial trunnion for mounting the roller at both ends, which tube has several neighbouring channels arranged near or in the tube wall, wherein, in each case, two neighbouring channels are connected together at their one end and the other end of one or both channels to the feed and the other to the return of a feeding device for a tempering agent and wherein the connection of the channels to the feed and is the return takes place via axial channels in an axial trunnion of the roller and via individual radial channels in the end face of the roller, and wherein the radial channels are formed by two discs lying closely adjacent set in the roller tube, wherein at least one of the discs has in its surface turned towards the other disc grooves extending in the radial direction, the radially outer ends of which are connected via apertures in the one disc in each case with a channel of the roller tube and the radially inner ends of which are connected via axial bores in the other disc with the one axial channel or other axial channel in the axial trunnion of the roller.

With the configuration of the roller in accordance with the invention, the shaped formation of the radial channels is not dependent on the manufacture in the shape of bores, but is constituted by grooves, the crosssection of which can be varied at will and which can be matched to a channel profile favourable for flow. If, for example, the channels in the roller tube have a cross-section extending in the peripheral direction in the shape of a kidney, then in accordance with the invention, the breadth of the grooves can continuously increase from the centre outwardly, whereby the resistance to flow in the region of the grooves can be noticeably diminished. The manufacture of a grooved disc can take place in simple and cost favourable fashion by casting.

Although within the scope of the invention, the radial channels can be formed by grooves in both discs, for reasons of cost, a configuration is preferred in which the grooves are constructed exclusively in the inner lying disc bordering against the channels of the roller is tube. In this connection, it is of advantage if the grooves run together to form connected groups of grooves at the flow or the return in the middle of the disc and the grooves of the other group of grooves end at a distance from the grooves running together in the middle.

Both discs can be set directly into the bore of the roller tube, wherein the inner wall of the roller tube limits the channels formed by the grooves radially outwardly. For simplification of assembly, however. it can also be provided that the disc provided with grooves is set into a cylindrical recess in the other disc so that the channels are limited radially outwardly by the other disc. A constructional simplification can furthermore be achieved in that the outerlying disc has a cylindrical recess on the outer side in which the flange of the axial trunnion is arranged and fixed by bolts. The connection of the discs with one another and/or the fixture of the discs in the roller tube can result in suitable fashion by adhesion.

The invention is subsequently explained in more detail with reference to an exemplary embodiment, which is illustrated in the drawing. It shows Figure 1 shows a longitudinal section through an inking roller with tempering, Figure 2 shows a cross-section through the roller in accordance with Figure 1 along the lines II-II, Figure 3 shows a cross-section through the inking roller in accordance with Figure 1 along the lines III-III, Figure 4 shows a cross-section through the inking roller in accordance with Figure 1 along the lines IV-IV, and Figure 5 shows a perspective illustration of a constructional element of the inking roller in accordance with Figure 1.

The inking roller 1 illustrated in the drawing is destined for the inking unit of a printing press. The inking roller 1 consists essentially of a roller tube 1 of aluminium, the tube wall of which has parallel channels 3, 4 of kidney-shaped cross-section. The outer surface of the roller tube 2 is provided with a cover 5. At its end faces, the roller tube 2 has cylindrical bores 6, 7 in which, in each case, a cylindrical disc 8, 9 is set and connected by adhesion in liquid tight fashion with the roller tube 2. The disc 8 has in its end face turned towards the channels 3, 4 segment-shaped cutouts 10 which are dimensioned sufficiently large and so positioned that in each case two neighbouring channels 3 and 4 are connected together by one cutout 10. In the end face turned outwardly, the disc 8 is provided with a fitting bore 11 in which the flange 12 of a bearing trunnion 13 is fixed by means of bolts 14.

The disc 9 has on both end faces a cylindrical fitting bore 15 or 16. A disc 17 is set in the inner lying fitting bore 15, the depth of which corresponds to the fitting bore 15. In the outerlying fitting bore 16 by means of bolts 18, the flange 19 of a hollow bearing trunnion 20 is fixed. The disc 9 is provided with a central through bore 21 and three through bores 22 arranged at the same distance from this and at the same distance from one another. In the through bore 21 is located the end of a tube 23 which extends through the hollow bearing trunnion 20 and which is connected to the feed connection of a feeding unit for feeding a liquid tempering agent. The through bores 22 are connected via a conical bore 24 in the flange 19 with the axial channel 25 formed by the hollow bearing trunnion 20, the dia ter of which is greater than the exterior diameter of the tube 23. The axial channel 25 is connected to the return of the feeding device for the tempering agent.

For connecting the through bores 21, 22 with the channels 3 or 4 respectively, radial channels 26, 27 are formed by the discs 9, 17. For this. the disc 17, which is particularly clearly to be seen in Figure 5, has in its face turned towards the disc 9 grooves 28, 29 which extend in the radial direction and the width of which increases from inside to outside. The grooves 28 run together in the middle of disc 17. The grooves 29 end at such a distance f rom the middle of the disc 17 that they remain separated by a wall from the grooves 28. In the outer surface, the disc 17 has in the region of the grooves 28, 29 cutouts 30 by which the grooves are maintained in connection with one channel 3 or 4. The disc 17 is so aligned with respect to the disc 9 that the radially inner ends of the grooves 29 lie opposite the openings of the through bores 22.

The configuration of the disc 17 described can be manufactured in simple and cost favourable fashion as a cast part, for example of aluminium. In order to be able to clamp the disc 17 during machining work, it has on its rear side turned away from the grooves 28, 29 a hollow post 31.

By the configuration of inking roller 1 described with little preparation outlay, a profile more favourable to flow of the channels for feed and return of the tempering agent is achieved and the efficiency of tempering correspondingly improved. The tempering agent fed via the tube 23 arrives at the mouth of the through bore 28 first in the radial channels 26 formed by the grooves 28.

By means of the radially outwardly increasing cross section of the channels 26, the flow speed of the tempering agent is continuously reduced, so that on entry into the channels 3, the formation of strong turbulence does not arise. After passing through the channels 3, the cutouts 10 and the channels 4, the tempering agent arrives in the channels 27 formed by the grooves 29, wherein the flow speed of the tempering agent as a result of the radially inwardly reducing cross-section of these channels is increased again. The tempering medium comes out of the channels 27 via the through bores 22 and the conical bore 24 into the axial channel 25 connected to the return.

Claims

1. A roller consisting of a roller tube and axial trunnion for mounting the roller at both ends, which tube has several neighbouring channels arranged near or in the tube wall, wherein, in each case, two neighbouring channels are connected together at their one end and the other end of one or both channels to the feed and the other to the return of a feeding device for a tempering agent and wherein the connection of the channels to the feed and the return takes place via axial channels in an axial trunnion of the roller and via individual radial channels in the end face of the roller, and wherein the radial channels are formed by two discs lying closely is adjacent set in the roller tube, wherein at least one of the discs has in its surface turned towards the other disc grooves extending in the radial direction, the radially outer ends of which are connected via apertures in the one disc in each case with a channel of the roller tube and the radially inner ends of which are connected via axial bores in the other disc with the one axial channel or other axial channel in the axial trunnion of the roller.

2. A roller according to Claim 1 wherein the channels in the roller tube have a kidney-shaped cross-section extending in the peripheral direction and that the width of the grooves increases from the centre radially outwardly continuously.

3. A roller according to one of Claims 1 or 2 wherein the grooves are constructed exclusively in the inner lying disc bordering on the channels of the roller tube.

4. A roller according to any one of the preceding Claims wherein the group of grooves connected to the feed or to the return run together in the middle of the disc and the other group of grooves end at a distance from the grooves running together in the middle.

5. A roller according to one of the preceding Claims wherein the disc provided with grooves is set in a cylindrical recess in the other disc. 10

6. A roller according.to any one of the preceding Claims wherein the outerlying disc has on the outer side a cylindrical recess in which the flange of the axial trunnion is fixed. 15

7. A roller according to any one of the preceding Claims wherein the connection of the discs with one another and/or the fixing of the discs in the roller tube takes place by adhesion. 20

8. A roller provided with channels and an axial end feed and return for tempering agent substantially as hereinbefore described with reference to the accompanying drawings. 25

9. A roller according to any one of the preceding Claims and configured as an inking roller for a printing press.