Winder
The invention relates to an arrangement for forming a roll by winding a web in its longitudinal direction around a core, which arrangement comprises a supply appliance for a new core and devices for the roll support by means of peripheral and/or central support forces and in which arrangement the new core is supplied after the complete roll is removed from the winding position. 
     PRIOR ART 
     It is important in automated winders for paper rolls that the measures preceding a new winding are possible to carry out already during the foregoing winding process. It is of special importance to arrange the new core at an arbitrarily chosen time event in to the core supplier, by means of which the new core is moved in to the winding position after the previous roll is removed. Known arrangements give rise to the problem that the core supplier, which starts the core supply from outside the actual winder, requires its own space. If the removal track of the roll intersects the track of the core placement on the other hand, a core cannot be placed in the core supplier until after the roll has been removed, if the supplier is located in connection with the actual winder. Another problem existing especially in centrally supported windings is that the synchronizing of the roll removal and the core supply is difficult to carry out. As a result of these known defects, the capacity of the winder arrangement cannot be optimally exploited. 
     THE OBJECT OF THE INVENTION 
     The object of the invention is to provide a web winder arrangement, in which the winding capacity is effectively utilized by the synchronization of the core supply with the removal of the previous roll. One hereby attempts to provide a one-operator or a fully-automated arrangement by means of automated operation stages. A further object is to provide an arrangement, in which the new core can be placed in the core supplier at a freely chosen time moment during the performance of the previous winding. Hereby the new core will not stand in the way of the removal track of the previous, complete roll. At the same time one attempts to provide an arrangement, in which the core supplier is in connection with the actual winder so that the space required by the supplier is most limited. A particular object is to provide an arrangment which is suited for the operation in an arrangement in which the roll support is at least partially carried out by the central support effect. 
     In such arrangements the web winding is usually controlled by the adjustment of the line load acting on the roll mantle, that is, the force by which the formed roll is pressed against the support roll. The adjustment of the line load in this winder is carried out usually either automatically, as a result of the roll construction entirely, or by applying external force sources affecting the roll line load, if one diverges from the roll normal use. An example of such winders is the construction presented in the published British Patent Application 2 142 909. 
     SUMMARY OF THE INVENTION 
     In a preferred embodiment of the invention, the new core is located in the supply appliance without the core standing in the way of the roll transfer. Furthermore, the supply appliance is located in connection with the actual winder and requires the least possible free space. The one-operator automated function is possible because the supplied core retains the web front end in place. A central support grip on the core can be provided either already when the core retains the new web end in place, or immediately preceding this function. Thus, the supporting grip is in the latter case a function of the final stage for the core supply. The crux of the invention is in that the arranging of the core supply is located at the side of the winder within an area, which already has to be exploited for roll removal in the winding process. A favourable embodiment of the invention includes a core stem movable in the axial direction of the core, which stem is arranged in the central support appliance and by means of which the supporting grip on the core is carried out. One stem known per se comprises a mandrel portion provided with an expansion plug to be placed inside the core. A firm grip between the core transferred in the winding position and the stem is easily carried out by this means. The stem, or both stems located at separate ends of the core, can be provided with motor members, by which the rotation of the web winding can be carried out. If the rotation is carried out by the peripheral support drum, the stem comprises a bearing allowing the rotation. 
     The core supply appliance is most advisable rotatably supported at a bearing position of the support member, which is located in the central support appliance. This support member, for instance, is a movable, preferably turnable support arm. An arranging corresponding the dimensions of the core, and correspondingly the roll to be formed, is easily available, if the central support appliances located at the first head of the roll are separate from the corresponding members, which are located at the side facing the other head. This arranging can be adapted to correspond the core axial length. The core and the core stem are located co-axially prior to the stem grip on the core. In order to carry out this, the core stem and, supported at its support member, the core supply trough are arranged to cooperate. This supporting grip of the stem on the core being substantiated, the core supply appliance is released from the core. 
     The descendence track of the completed previous roll is unobstructed, when the supply appliance and the core located therein are lowered below the roll descendence track. The new core is placed in the supply appliance during the winding of the previous roll at a freely chosen time moment. This core is preferably lowered at the level of the hinge point of the support arm in the central support appliance, or in a receiving member located below it. The core lowering can be carried out by the co-operation of the supply appliance and the central support appliance descending the roll. 
     The core fed during the previous winding in the supply appliance is located at such distance from the winding position, that the previous roll being completed can be transferred over this new core without touching it. In a favourable realization of the core distance, the core placed in the supply appliance is moved in to the winding position along a curved track, the moving centre of which track is located at a member of the central support appliance. The distance of a core track point from this centre is variable. An uncomplicated and effective distance variation is carried out by another support arm movable in its longitudinal direction, which is supported through a bearing at the support arm of the central support appliance. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     The invention is described in the following with reference to the attached drawing, in which 
     FIG. 1 discloses a side view of a web winder, in which the arrangement according to the invention can be applied, 
     FIG. 2 discloses an embodiment of the invention in a side view and partially in section, 
     FIG. 3 shows the arrangement of FIG. 2 in another stage of the operation, 
     FIG. 4 shows the arrangement of FIGS. 2--3 in a third operation stage. 
    
    
     PREFERRED EMBODIMENT OF THE INVENTION 
     In the drawing, numeral 1 refers to a web to be wound, which is guided over guide rolls 2 to a slitter device 3, in which the rotating slitter blades sever web 1 in several portions, of which two neigbouring portions 1a and 1b are shown in FIG. 1. Web portion 1a runs via an auxiliary drum 4 to a support drum 5 located at right, whereas web portion 1b is directly guided to a support drum 5b located at left. Support drums 5 and 5b rotate in the same direction indicated by an arrow 16. Supported against the support drums, rolls 6 are formed which receive peripheral support by support drums 5, 5b and, at the same time, central support by support arms 8. The central shafts of rolls 6 are supported via a stem 7 at arms 8. Each roll 6 is supported by two support arms 8 and, the roll reaching the desired diameter, the roll is lifted to a floor level 15 of the arrangement by turning support arms 8 away from support drum 5 by means of a work cylinder-turning arm 10-12. Support arms 8 rotate thereby around their bearings 9. Work cylinder-turning arm 10-12 is rotatably supported by a bearing 13 at support arm 8. Each support arm 8 is attached at a sledge 14 movable in the roll axial direction. Work cylinder-turning arm 10-12 is a two-staged tilt device known per se, an arm 10 of which is journalled at sledge 14, for instance, in a bearing (not shown) in the vicinity of bearing 9. The distance between the support arms is adjustable by moving the sledges to correspond to the desired roll length. A normal axial length of the roll is usually 1 m, but rolls having an axial length of only 40 cm may be wound, whereas the maximum practical axial length needed for rolls just slightly exceeds 260 cm. The weight of a full-sized roll of this length is about 4 tons. Numeral 5a refers to a frame member of rolls 4,5,5b. 
     Support drums 5 and 5b and auxiliary drum 4 are journalled at the same level as support arms 8, that is at floor level 15 of the arrangement. The journalling of the drums is not shown in detail, it is only drafted by a member 18. 
     FIG. 2 discloses the final stage of winding a nearly completed roll 6, prior to severing the web or the web strip 1a. At the outer end of support arm 8 is located stem 7, which can be moved in a direction corresponding to the axis of roll 6. Stem 7 is rotatable around its axis as known per se. A core 19 is under a firm grip of stem 7 during the winding in order to provide the central support. The turning of support arm 8 around its journalling point 9 is carried out according to the peripheral support-central support geometry, as disclosed in the published British Patent Application 2 142 909. The turning of support arm 8 to a position for descending roll 6, or to a supply position of a new core 19a in the direction towards support drum 5, is carried out by means of tilt arm 10 and a work cylinder 11. A hinge 13a between cylinder 11 and arm 10, correspondingly a journalled hinge 13 between support arm 8 and power arm 12, make possible the relative motions carried out during the turning. 
     New core 19a is located in a supply appliance 21, which comprises a supply unit 22-26 supported at support arm 8. A first and a second arm 8 is located in the axial direction at a corresponding side of roll 6. One end of core 19a is locked by pinch locking in a lock trough 22 of the supply unit; the other end of core 19a is located in trough 22 located at the other side of roll 6. A supply arm 23 of the supply unit is movably supported at a bushing 25, bushing 25 being rotatably journalled at arm 8 in a bearing 26. The motion of arm 23 relative to bushing 25 is shown by an arrow 24 and the rotation of the upply unit relative to the bearing 26 by an arrow S. The functions and members 23-26 of two supply units are so arranged, that cores 19 or 19a are easily accommodated between members 23, 25-26 of the supply units. Troughs 22 extend towards each other so that troughs 22 exert a firm grip on core 19a. 
     In an uncomplicated application of motion 24, trough 22 can be located at two different distances from bushing 25. In the position corresponding the minimum distance, arm 23 is locked at bushing 25. The movement to a position corresponding to the maximum distance is carried out by releasing the locking, after which arm 23 is pushed in to said position by a spring member (not shown) acting upon arm 23. 
     FIG. 3 shows a stage after the severing of web strip 1a, whereby completed roll 6 is descended on floor level 15 (arrow A). At this stage, support drum 5 is set to a slow crawling speed. A depression 20 is arranged below level 15 for lowering core 19a locked in the troughs 22, that roll 6 can be moved to floor level 15 over core 19a without touching it. Motion 24 of supply arm 23 is so adjusted, that core 19a and troughs 22 settle down in depresion 20 without touching the floor. Reference numeral 1c refers to a new leading end formed in the severing of web 1a. A guide 27 is located on the floor for the guidance of sledge 14. During the turning of support arm 8 in direction A, power arm 12 is first set to the full stroke value, after which the function of turning arm 10 is initiated. 
     FIG. 4 discloses a supply stage of new core 19a slightly prior to the arrival of core 19a in the winding position. Supply arm 23 and support arm 8 are rotated in this embodiment around their turning centers 26 and 9 mainly during the same time. The turning of supply arm 23 in a direction B is, however, independent from the turning of support arm 8, so that after roll 6 is removed, arm 23 can be turned before turning support arm 8. When turning support arm 8 in direction B, turning arm 10 is first returned to its basic location (FIG. 2), after which power arm 12 is pulled to its minimum extension . 
     Core 19a being pressed against web 1a in the winding position by supply unit 22-26, stems 7 are arranged coaxially with core 19a. Thereafter stems 7 are moved in the axial direction in a holding grip on core 19a and supply troughs 22 are released from the grip on the core. By the motion track of core 19a is meant the transfer path of core 19a from depression 20 to the winding position. By means of motion 24, the distance of a track point of the motion track can be altered relative to the movable track center, which is located at bearing 26. The distance of the track point is so adjusted, that trough 22 does not hit the floor. During the B-directed main turning the distance can be adjusted to its maximum value, so that trough 22 is located at the maximum distance from bearing 26. Core supply appliance 21 shown in FIGS. 2-4 is located at that side of support arm 8, which faces the descending track for roll 6. Appliance 21 can equally be rotatably journalled at the central portion of arm 8, on that side of arm 8 facing roll 6. Appliance 21 is thereby so adjusted, that it easily settles within the free space between stem 7 and bearing 9 or the bearing of arm 10. 
     The invention is not restricted to the embodiment disclosed but several modifications of the invention are possible within the scope of the attached claims. 
     ANOTHER EMBODIMENT OF THE INVENTION 
     Instead of the one-piece support arm 8 shown one can apply a two-portion support arm that is hinged at its central part, the turning motion for portions of which can be arranged, by means corresponding to the appliance 10-13, 13a relative to the hinge. 
     Instead of the function order previously disclosed, the grip of stem 7 on core 19a can be arranged prior to the touching of core 19a on web 1a, also. Thereby stem 7 is first brought at the location of core 19a (FIG. 4) and stem 7 is arranged to grip core 19a. Supply trough 22 is released from core 19a. Thereafter core 19a is moved to press web 1a. In this set of order, the grip between stem 7 and core 19a is a part of the core supply function. During the time interval between the severing of web 1a and the arrival of core 19a in the winding position, web 1a can be held against drum 5 by members known per se.