Improvements in or relating to roller mounting arrangements

Abstract

The invention relates to an apparatus comprising a pair of rollers (2) with a nip and having respective axes thereof in a common plane therebetween, first and second roller mounting arrangements (8) at respective opposite ends of said pair (2), said arrangements having a hinging system (26, 30) at one side of said common plane and whereby one of the pair of rollers (2) can be turned relative to the other. The invention also relates to an associated method.

Claims

1. Apparatus comprising a pair of rollers with a nip and having respective axes thereof in a common plane therebetween, first and second roller mounting arrangements at respective opposite ends of said pair, said arrangements having a hinging system at one side of said common plane and whereby one of the pair of rollers can be turned relative to the other.

2. Apparatus according to claim 1, and further comprising a restraining system (33, 34, 36) at the opposite side of said common plane from said hinging system for restraining turning of said one of the pair of rollers away from the other about said hinging system.

3. Apparatus according to claim 2, wherein said restraining system comprises resilient means.

4. Apparatus according to claim 1, wherein each roller mounting arrangement, comprises first and second bearing blocks extending substantially perpendicularly to said common plane and formed with respective bores extending in said common plane for receiving respective roller bearings, the blocks of each roller mounting arrangement having a hinge device therebetween at one side of said common plane and constituting a portion of said hinging system.

5. Apparatus according to claim 4, wherein each hinge device includes an ear of the first block and fixedly attached to the second block.

6. Apparatus according to claim 4 or 5 and further comprising, in each roller mounting arrangement and at the opposite side of said common plane, a restraining connection between the two blocks and restraining against turning of the blocks away from each other about said hinge device.

7. Apparatus according to claim 4 or 5, wherein said restraining connection comprises a resilient device urging the two blocks to turn towards each other about said hinge device.

8. Apparatus according to claim 1 further comprising, around at least one of the rollers, a plate having cutting and/or creasing and/or holing devices for web material passing through said nip.

9. A roller mounting arrangement comprising a bearing block extending generally in a first plane and formed with a bore having its axis substantially perpendicular to said plane for receiving a roller bearing, said block having, substantially perpendicular to said plane and extending parallelly to said axis, a substantially planar face for applying face-to-face to a substantially planar face of a second bearing block and having at one end of its planar face, a hinge part whereby it may turn towards and away from said second bearing block.

10. A roller mounting arrangement according to claim 9, wherein said hinge part comprises an ear inwardly of the plane of the planar face of the first-mentioned block and flexibly connected to the remainder of the first-mentioned block.

11. A roller mounting arrangement according to claim 10 and further comprising, at the opposite end of said planar face and inwardly of the plane of said planar face of the first-mentioned block a second ear which is thicker than the first-mentioned ear.

12. A roller mounting arrangement according to claim 11 and further comprising, at said second ear, a restraining device serving to deter swinging of the first-mentioned block away from said second block.

13. A roller mounting arrangement, comprising first and second bearing blocks extending generally in a first plane and formed with respective bores extending parallelly to each other and substantially perpendicularly to said plane for receiving respective roller bearings, the blocks having a hinge device therebetween at one side of the common plane of the axes of said bores.

14. An arrangement according to claim 13, wherein said hinge device includes an ear of the first block fixedly attached to the second block.

15. An arrangement according to claim 13 or 14 and further comprising, at the opposite side of said common plane, a restraining connection between the two blocks restraining against relative turning of the blocks away from each other about said hinge device.

16. An arrangement according to claim 15, wherein said restraining connection (33, 34, 36) comprises a resilient device urging the two blocks relatively to turn towards each other about said hinge device.

17. A method of treating a web, comprising passing the web through a nip between first and second rollers having respective axes in a common plane, while cutting and/or creasing and/or holing devices on at least one of said rollers cut and/or crease and/or hole said web and while enabling the first roller to turn in space relative to the second roller about an axis to one side of said common plane.

18. A method according to claim 17 and, at the opposite side of said common plane, restraining said first roller from relatively turning about said axis away from said second roller.

19. A method according to claim 17, wherein said restraining comprises resiliently urging said first roller relatively towards said second roller about said axis.

20. A method according to any one of claims 17 to 19, wherein said web is of packaging material.

Description

[0027] In order that the invention may be clearly and completely disclosed, reference will now be made, by way of example, to the accompanying drawings, wherein:

[0028] FIG. 1 shows a diagrammatic perspective view of a pair of cutting and/or creasing and/or hole-making tool cylinders, with their two cylinder mounting arrangements, for a converting plant;

[0029] FIG. 2 shows a diagrammatic perspective view of a second embodiment of a pair of cutting and/or creasing and/or hole-making tool cylinders, with their two cylinder mounting arrangements, for a converting plant

[0030] FIG. 3 shows the apparatus of FIG. 2 in a first side view; and

[0031] FIG. 4 shows the apparatus of FIG. 2 in a second side view.

[0032] Referring to FIG. 1 of the drawings, there are shown the pair of steel rollers, i.e. tool cylinders, 2 with annular bearers 4 integral therewith and end shafts 6 and 7 also integral therewith. The lower of the end shafts 7 is a drive shaft. At each end of the pair of tool cylinders 2 is a cylinder mounting arrangement 8 comprising upper and lower bearing blocks 10 and 12 which generally extend in a common vertical plane. Through the blocks 10 and 12 at each end and with axes parallel to each other and perpendicular to that vertical plane are respective bores 14 housing the bearings (not shown) carrying the end shafts 6. Each upper block 10 has an upper, horizontal, rectangular, planar face 16 and a lower, rectangular, horizontal, substantially planar face 18. Each lower face 18 is arranged face-to-face with an upper, horizontal, rectangular, substantially planar, upper face 20 of the block 12 therebelow. The lower face 22 of the block 12 is rectangular, planar and horizontal for resting upon a floor or a foundation. The upper block 10 has, immediately above the plane of the surface 18, two ears 26 and 28, of which the ear 26 is thinner in the vertical direction than is the ear 28. By means of a sturdy bolt 30, possibly with the interposition of a shim 32, the ear 26 is bolted to the lower block 12. At each end of the pair of cylinders 2 and by means of a bolt 34 and a nut 33 thereon a spring 36 is urged downwards against the thicker ear 28 of the upper block 10, so that that ear is pressed downwards to pre-load the bearers 4 against each other. The bolt 34 extends vertically significantly into the block 12 and terminates at its upper end at the nut 33. The thinner ear 26 and the remainder of the block 10 are flexibly interconnected, so that the remainder of the block 10 is thus able to hinge very slightly about its thinner ear 26 to allow the bearer preload provided by the spring 36 to remain substantially constant in spite of thermal expansion.

[0033] Consequently, ears 26 of blocks 10 are fixedly attached to blocks 12 by virtue of bolts 30 while ears 28 are allowed to move vertically vis-à-vis blocks 12 by virtue of the bolt 34, nut 33 and spring 36 arrangement, thus giving the upper cylinder or roller mounting arrangement (which carries the upper tool cylinder) the freedom to pivot in relation to the lower cylinder or roller mounting arrangement (which carries the lower tool cylinder) about a pivot axis A created due to elasticity in region 42 of ears 26 connecting each ear 26 to the rest of the block 10 (see also FIG. 2), said region 42 thus forming a flexible interconnection connecting ear 26 to the rest of the block 10.

[0034] In other words, ears 26 and bolts 30 form a hinging system of the apparatus allowing the upper cylinder or roller mounting arrangement to pivot vis-à-vis the lower cylinder or roller mounting arrangement about the pivot axis A.

[0035] Consequently, the rotational axes of the tool cylinders 2 are parallel and the bearers 4 form a nip for cutting and/or creasing and/or holing a blank or a web of a packaging material, e.g. a liquid packaging material comprising a laminate of layers, wherein the cylinder or roller mounting arrangement of the upper tool cylinder is pivotally mounted to the cylinder or roller mounting arrangement of the lower tool cylinder about a pivot axis A which is parallel to the rotational axes of the tool cylinders. The bolt 34, nut 33 and spring 36 arrangement at each ear 28 form a pre-load system that will bias the roller mounting arrangement of the upper tool cylinder towards the roller mounting arrangement of the lower tool cylinder in a pivoting or flexing movement about the pivot axis, but will allow ears 28 to move towards or away from blocks 12 to accommodate for thermal expansion and retraction of members in the apparatus.

[0036] This will allow the pre-load system to keep the tool cylinders 2 at a desired mutual distance independent of temperature variations.

[0037] Referring now to FIGS. 2-4 of the drawings, it is shown an apparatus which is essentially identical to the apparatus shown in FIG. 1, the only difference being that the flexible interconnection 42 connecting each ear 26 to the rest of the block 10 comprises a recess 44 giving the interconnection 42 a vertical height which is less than the vertical height of the outer end of ear 26, thus rendering the flexible interconnection 42 more elastic than the corresponding interconnection in FIG. 1.