AN IMPROVED SLITTER

Abstract: A slitter for steel strips comprises two mutually co-operating arbors which have mutually co-operating disc shaped cutters and intervening spacers. At each arbor end there is disposed a hydraulic piston (19) for axial displacement of means (16, 17, 18) within the arbor end which means are adapted, at their axial displacement, to displace a ring (14) on the arbor end, so as to clamp cutters and spacers between the said ring (14) and a stationary ring at the other end of the arbor.

Description: AN IMPROVED SLITTER The present invention relates to an improved slitter, particularly a slitter for steel strips. Hereinafter, the term steel strips, of course, should be concieved to include also other materials, such as brass, copper and other metals, for instance, and sometimes also plastic materials. The work performed by a slitter as contemplated here is sometimes called "slitting" in that the stock material is εlitted longitudinally, as contrasted to cut¬ ting, where the stock material is cut transverse to its longitudinal direction. Typically, a slitter for steel strips comprises two mutually parallel arbors on which there are threaded pairs of mutually co-operating, ring shaped cutters and inter¬ vening spacers. The width, i.e. the axial measure of the cutters and the spacers depends on the strip width or widths of the strip steel in each case. On shifting to other widths the cutters and spacers have to be shifted, which is usually called re-assembling. When the cutters and spacers have been arranged on the two arbors, irrespective how this has been done, it is necessary to lock them against axial movements. To this end a plurality of different solutions have been proposed. Common to those is that they are comparatively elaborate and, probably beyond all, rather time consuming. The present invention has aimed at providing a lock¬ ing means for cutters and spacers which avoids the just mentioned problems and offers the possibility to facili¬ tate the re-assembling to a greater or smaller extent, at the ultimate end even to the extent that the re-assembling may be carried out fully automatically. To the just mentioned end the locking means according to the present invention has been designed in such a man¬ ner that there at each arbor end is disposed a hydraulic piston for axial displacement of means within the arbor end, which means are adapted, at their axial displacement, to axially displace a ring threaded on the respective arbor end, so as to clamp cutters and spacers between said axially displaceable ring and a similar, axially statio¬ nary ring at the other end of the arbor. According to the invention it is particularly advant¬ ageous that there on each arbor end is threaded an axially displaceable ring which has an inclined surface for co¬ operation with a corresponding inclined surface on one or more radially inwardly and outwardly movable pistons, which are movable due to interconnection with key means which are axially movable within the respective arbors and are each adapted to be axially moved by means of a hydrau¬ lic piston disposed axially outside the arbor end. The just defined locking means is simple and reliable in its design and affords, in conjuction with other steps of development, a possibility to a complete automatization of the re-assembling work, in case this should be found desirable. The invention will be disclosed in more details below with reference had to the accompanying drawings. Fig. 1 is a diagramatical end view of one embodiment of a slitter, picked as an example, having a locking means according to the invention for each one of the cutter arbors, intended to show the environment in which the locking means according to the invention is intended to be used; Fig. 2 is a plan view from above of the slitter, corresponding to fig. l; Fig. 2A illustrates a detail; Fig. 3 is an axial longitudinal section showing the end of the cutter arbor, having a locking means according to the invention, wherein the locking means is shown in two different positions. In the drawings there is shown, in end view, a part of a strip slitter comprising two frame portions 10, 11 between which there are rotatably journalled two arbors 12, 13, on which there are threaded a plurality of mutu¬ ally co-operating disc shaped cutters v.'ith intervening spacers. The arbors and the drives therefore are known per εe and do not need any detailed description. The material is intended to pass through the slitter in the direction of the arrow R in fig. 2. According to fig. 3 there is disposed on the arbor 13 a thrust ring 14, which is axially movable by means of pistons 15, each one of which has an inclined surface which is adapted to co-operate with a corresponding in¬ clined surface on the thrust ring 14. The pistons 15 are radially movable in relation to the arbor 13 in that they, by means of keygrooves or the like, are interconnected with axially movable keys 16, which are adapted to be axially displaced by displacing a thrust rod 17. At its right hand end this rod has a head 18. The head 18 is displaceable leftwardly by means of a rod 20 that is mov¬ able by means of a hydraulic piston 19, and the rod 20 has pivotable hooks 21 which may engage behind the head 18 and pull the head outwardly, towards the right, when the pis¬ tons 15 are to be displaced outwardly to axially lock the cutters and spacers on the arbor 13. Portions of the right frame wall 11 are outwardly pivotable around a vertical shaft 22, viz. by means of a hydraulic cylinder 23, one end of which is pivotally con¬ nected to a bracket 24 on the frame, and the other end of which is pivotally connected to a stationary bracket 25 on the slitter frame, fig. 1 and 2. The just mentioned pivot¬ able frame wall portions have a locking lug 26 which, by means of a hydraulic piston 27, may be locked to a frame portion 28 to lock the end wall in operative position. A corresponding locking means is disposed at the other end of the frame.

Claims: CLAIMS 1. An improved slitter, particularly a slitter for steel strips, comprising two mutually parallel disposed arbors (12, 13) on which there are threaded pairs of mutu¬ ally co-operating disc shaped cutters and intervening spacers, characterized in that there at each arbor end is disposed a hydraulic piston (19) for axial displacement of means (16, 17, 18) within the arbor end, which means are adapted, at their axial displacement, to axially displace a ring (14) threaded on the respective arbor end, so as to clamp cutters and spacers between said axially displace¬ able ring (14) and a similar, axially stationary ring at the other end of the arbor. 2. An improved slitter as claimed in claim l, charac¬ terized in that there on each arbor end is threaded an axially displaceable ring (14) which has an inclined sur¬ face for co-operation with a corresponding inclined sur¬ face on one or more radially inwardly and outwardly mov¬ able pistons (15) , which are movable due to interconnec¬ tion with key means (16) which are axially movable within the respective arbors and are each adapted to be axially moved by means of a hydraulic piston disposed axially outside the arbor end.

Inventors: SAARINEN KARI, SAARINEN, KARI
Applicants: AKV I KOPPARBERG AB, A K V I KOPPARBERG AB
Application year: 1989
Main classification: B23D19
IPC codes: B23D19, B23D35