Fixing end for cores used in reeling

Abstract: The present invention relates to a fixing end for cores (10) used for reeling, said fixing end comprises wedge pieces (15) moving in axial direction and holes (24) bored bevelledly on the outer circumference (22) of the fixing end (20), out of which the holding surface (15') of the wedge pieces (15) of the fixing end (20) moving in axial direction has been arranged to ascend for locking the fixing end (20) securely to the inner surface of the core (10). The radial motion of the holding surface (15') of a wedge piece (15) out and in relative to the outer surface of the fixing end (20) is forced-controlled and the forced-control has been arranged to be provided by mediation of the axial motion of the wedge piece (15).

Description: The present invention relates to a fixing end for cores used in reeling. A fixing end according to the preamble of claim 1 is known from DE-A-23 44 706. In rolling paper web and other web-like materials, cores are used, as is well known in the art, which by mediation of fixing ends are attached to the rolling means. Owing to highly increased reeling speeds, the fixing means of cores or equivalent are to meet higher and higher operation requirements. The penetration of fibre dust between the parts of the fixing end has been particularly a problem, as the fixing end becomes locked so that releasing it is difficult and takes a great deal of time. As regards state of art, reference is made to Finnish patent specification No. 62 510, in which a fixing end is disclosed for cores to be used in reeling. In said design known in the art inner and outer wedge pieces are employed which can be moved together axially so that the core can be positioned in place and in which the axial movability of the inner wedge pieces in the direction of the power effect of the compression element has been limited by an adjustment member. As regards state of art, reference is made to Finnish patent application No. 861528 in which a means is disclosed for fastening tubular reeling cores, particularly reeling cores supporting paper webs or equivalent material webs, in which for fixing the means, expansion created by torque is used for fixing the means and in which the return, when being released, is spring-acting, whereby the problem can be that the means remains stuck in the fixing position. As regards state of art, reference is also made to EP patent specification No. 0 531 285, disclosing a fixing end for reeling cores, in which by mediation of bevelled surfaces of the fixing end, a fixing piece is fastened using expansion of the bevelled surfaces of the fixing end provided by torque as the fixing end hits the stopper. As the return member of the fixing end the spring return is used. As regards state of art, one more reference is made to DE publications Nos. 3 641 255 and 3 601 912, in the fixing arrangements disclosed wherein the return of the fixing end into release position may be problematic. As regards state of art, reference is also made to DE application specification No. 3 533 735, in which the spaces of different intermediate pieces and others may be problematic said other aspects may cause problems in providing secure fixing / releasing. AU-B-470 659 is a further prior art document. As becomes obvious from what is described in the foregoing, a specific problem in the designs known in the art is how to return the fixing end back to the release position which is particularly due to the fact that the dust from fibres becomes wedged between the fixing end parts, whereby the fixing members do not move back to their initial position from the expansion position. Problems may moreover be caused in prior art designs by mediation of the torque and potential clearances of pieces between different parts of the complicated constructions, which may lead even to rocking of the core in the course of reeling. The object of the invention is, therefore, to provide a design for eliminating the problems dealt with in the foregoing. A more specific aim of the invention is to create a design in which fibre dust would not cause locking of the fixing end into fixing position. A further aim of the invention is to create a design in which the load forces can be directed at a desired point in the basic construction, whereby the fixing end will not be damaged by the load forces. One more important aim of the invention is to provide a fixing end which is reliably insertable in and out of place. Furthermore, an aim of the invention is to produce a manufacturing technically preferred fixing end. For achieving the above aims and those to be disclosed below, the fixing end according to the invention is characterized by the characterizing features of claim 1. The fixing end is forced-controlled and the forced-control is based on the axial motion of the wedge pieces. In the arrangement of the invention out of the holes bored bevelledly on the outer circumference of the fixing end ascends a holding surface of axially moving round wedge pieces, said surface locking the seat firmly to the inner surface of the reeling core. In addition, the "expanding" parts of the fixing end have been so fixed on the actuation means that when the actuation means moves, all moving parts of the seat are moving. Hereby, stucking of the seat in the holding position has been completely prevented. A fixing end for cores used in reeling comprises holes bored bevelledly on the outer circumference of the fixing end through which a bevelled holding surface of the wedge pieces moving in axial direction ascends, locking the fixing end firmly to the inner surface of the core. The radial motion of the holding surface of the wedge piece in and out relative to the outer surface of the fixing end is forced-controlled, and said forced-control is based on the axial motion of the wedge piece. The part of the wedge pieces within the fixing end is round in cross-section. In geometrical shape the holding surface of the wedge piece is planar or rounded to be of the size of the radius of the fixing end or rounded somewhere therebetween. The holding surface of the wedge piece may have been roughened or grooved in axial direction for intensifying the grip. The fixing end of the invention is highly reliable in operation because the axial motion of the wedge pieces therein is relatively large compared with the radial motion, whereby the possible fibre dust is discharged from between the wedge pieces while they are moving. The design of the invention is simple also in design, whereby it is non-costly in manufacturing technique and in addition, reliable in operation. Moreover, with the fixing end of the invention, the bearing of the seat can be brought inside the fixing end to be at the load forces and to transmit the force directly to the basic construction when the wedge is supported to the frame, whereby the radial forces are directly mediated to the frame of the fixing end. The invention is described below more in detail, referring to the figures of the accompanying drawing, in which Fig. 1 presents a schematical cross-section of the fixing end according to the invention. Fig. 2 presents a schematical image of Fig. 1 in direction R, Fig. 3 a schematical image of direction T in Fig. 1, and Fig. 4 presents schematically the fixing end of the invention when viewed from outside. Fig. 5 presents schematically a second embodiment example of fixing end of the invention. Fig. 6 shows a fixing end according to Fig. 5 in direction T, and Fig. 7 shows the fixing end of Fig. 5 when viewing schematically from outside. In the embodiment example of the invention presented in Figs. 1 to 4, a means 20 for fixing a core 10 comprises wedge pieces 15 positioned on bevelled surfaces 12. The stopper pieces 13 define the location for core 10 in axial direction. The wedge piece 15 moves radially, thus fixing the core 10 in place by mediation holding surfaces 15', and the radial motion is produced forced-controlledly by mediation of the axial motion of the wedge piece 15. The axial motion of the wedge pieces 15 is relatively large, about 5 to 15 mm. In this manner, radial motion of 0.5 to 2.0 mm is produced. The T groove fixing 19 presented in Fig. 2 enables the radial motion and binds the wedge pieces 15 axially in place. In a means according to the invention, the torque is mediated directly to the basic structure, because the wedge pieces are supported to the frame of the fixing end 20, whereby the radial forces is conducted straight to the frame. The wedge pieces 15 have thus been fastened to an actuating means, e.g. to a plate spring 23 so that when the actuating means 23 provides a motion, all of the mobile parts of the fixing end are moving. Hereby, stucking of the fixing end in holding position is prevented. From the holes 24 bored bevelledly on the outer circumference 22 of the fixing means 20, a holding surface 15' of the wedge pieces 15 moving in axial direction arises, thus locking the fixing end firmly to the core 10. The radial motion of the holding surface 15' of the wedge piece 15 out and in relative to the outer surface of the fixing end 20 is forced-controlled, and said forced-control is based on the axial motion of the wedge piece 15. The part within the fixing end 20 of the wedge piece 15 is round in cross-section. The holding surface 15' of the wedge piece 15 is in geometrical shape planar or rounded, to be of the size of the radius of the fixing end, or a rounding radius therebetween. The holding surface 15' of the wedge piece 15 is bevelled relative to the axial line of the wedge piece. The bevel angle α 1 is essentially the same as the bore angle α 2 in the holes bored in the fixing end. As shown in Fig. 1, the actuation means 23 of the fixing end 20, such as disc spring, pulls, while moving in direction S 1 , the wedge piece 15 attached to the frame parts 31,32,33 of the fixing end in axial direction, whereby the wedge piece 15, round in cross-section, moves along the bevelled surface 12 in axial direction and at the same time, in radial direction so that the holding surface 15' of the wedge piece 15 ascends in radial direction out of the borings 24 made on the outer surface of the fixing end 20. For releasing the core 20, the frame parts 31,32, 33 of the fixing end are moved in the opposite direction S 2 to the direction of action S 1 of the actuation means, whereby the wedge pieces move axially in direction S 2 and so, the holding surfaces 15' move inwards so that the core 10 can be released from its location. As shown in Fig. 2, the wedge piece 15 has been attached e.g. with T-groove fixing 19 to the frame piece 31. Also other fixing systems known as such to a person skilled in the art, such as dovetail joint, serve the purpose. The fixing arrangement 19 is to tie the wedge piece 15 into axial motion and at the same time, to enable radial motion. Fig. 3 shows the fixing end 20 viewed from the middle of the core 10 and the figure shows the radially outward moved wedge pieces 15 with the holding surfaces 15'. Fig. 4 shows the outer surface of the fixing end 20, in which the bevelled borings 24 are visible, these being made for the wedge pieces 15, from which borings the holding surfaces 15' of the wedge pieces 15 move radially outwards. In embodiment example presented in Figs. 5-6, the wedge pieces 15 are not moved with a separate actuation means, instead, the expansion of the wedge pieces 15, that is, the radial motion is provided with axial transfer of the core 10 relative to the fixing end 20. Said embodiment example is not appropriate for cases in which the end face of the core 10 must be at the same point relative to the fixing end 20 in the course of the entire reeling. As shown in Fig. 5, the wedge pieces 15 of the fixing end 20 move in axial direction and at the same time, generate the radial motion of the holding surfaces 15'. The wedge pieces 15 comprise an end part 37 which is fixed to an annular member 38, this being supported against the end face of the core 10, whereby when the core 10 is moved in axial direction, the wedge piece 15 moves equally in axial direction, thus moving the holding surfaces 15' in radial direction. With the aid of the spring members 39, the wedge pieces 15 are returned to their initial position. As regards the rest of the parts, the embodiment example shown in Figs. 5-7 is equivalent to those presented in Figs. 1-4, and the equivalent parts are indicated by corresponding reference numerals.

Claims: A fixing end for cores (10) used in reeling, said fixing end comprising wedge pieces (15) moving in axial direction and apertures foreseen bevelledly on the outer circumference of the fixing end (20), out of which the holding surface (15') of the wedge pieces (15) of the fixing end (20), moving in axial direction, has been arranged to ascend for locking the fixing end (20) to the inner surface of the core (10), wherein the radial motion of the holding surface (15') of the wedge pieces (15) out and in relative to the outer surface of the fixing end (20) is forced-controlled and that the forced-control has been arranged to be produced by mediation of the axial motion of the wedge pieces (15), characterized in that the portion within the fixing end (20) of the wedge pieces (15) is round in cross-section and in that said apertures foreseen bevelledly are holes (24) bored bevelledly. Fixing end according to claim 1, characterized in that the angle between the longitudinal axis of the wedge pieces (15) and the holding surface (15') is substantially the same as the angle between the longitudinal axis of the fixing end (20) and the axis of the holes (24) made for the wedge pieces (15). Fixing end according to any one of claims 1 or 2, characterized in that the holding surface (15') of the wedge pieces (15) is planar in geometrical shape. Fixing end according to any one of claims 1 or 2, characterized in that the holding surface (15') of the wedge pieces (15) is rounded in geometrical shape. Fixing end according to any one of claims 1-4, characterized in that the axial motion of the wedge pieces (15) has been arranged to be provided by mediation of an actuation means (23). Fixing end according to any one of claims 1-4, characterized in that the axial motion of the wedge pieces has been arranged to be provided by axial transfer of the core (10) relative to the fixing end (20). Fixing end according to any one of the preceding claims, characterized in that the fixing end includes an arrangement (19) in which the axial motion of the wedge pieces (15) relative to a frame part (31) moving by actuation of the actuation means (23) of the fixing end (20) has been prevented but the radial motion has been made possible.

Inventors: ERONEN PEKKA, ERONEN, PEKKA
Applicants: VALMET CORP, VALMET CORPORATION
Application year: 1995
Main classification: B65H75
IPC codes: B65H75