WO2011077000A9

WO2011077000A9 - Quick-clamping arrangement for a slitter knife

Info

Publication number: WO2011077000A9
Application number: PCT/FI2010/051059
Authority: WO
Inventors: Pekka Eronen; Peter Frelander; Markku JÄRVENSIVU; Teuvo Kovaniemi; Jesse Laakso
Original assignee: Metso Paper, Inc.
Priority date: 2009-12-22
Filing date: 2010-12-17
Publication date: 2011-09-01
Also published as: FI8812U1; WO2011077000A1; DE212010000196U1; CN202825940U; FIU20090468U0

Abstract

Invention relates to a quick-clamping arrangement for the upper knife in a slitter winder, where the upper knife of the slitter winder is locked into its place by pressing the upper knife by a retaining cap (52) against a support flange (48) arranged on the shaft (6) of the upper knife, where the hub (54) of the upper knife is provided with a hub disc (56) that is movable by means of pressure fluid against spring pressure and where the end portion (68) of the hub is provided with a groove (70) for the retaining cap (52). The joint between the retaining cap (52) and the hub (54) is rotationally form-locked.

Description

QUICK-CLAMPING ARRANGEMENT FOR A SLITTER KNIFE

[001 ] The present invention relates to a slitter winder in a web material web material machine. In particular, the present invention relates to a quick-clamping arrangement for the upper knife in the slitter winder for a web material machine line, such as a paper machine line.

[002] A paper web coming from a web material machine, e.g. from a paper machine, is wound by a reel-up to form large machine rolls, the width of which may be over l Om and the diameter over 4m. The machine rolls are removed from the machine with a material web and taken to a slitter winder, where the machine roll is unwound and the web of material is slit into narrower partial webs and wound into smaller, so- called customer reels. [003] As known from prior art, the broad web of material is slit in the slitting section of the slitter winder into a plurality of narrower partial webs, which are rewound by a reel-up for partial webs onto mandrels, such as core tubes, to form customer reels. When the customer reels that are rewound simultaneously from each partial web are complete, i.e. there is a required amount of material on the reels, the winder is stopped and the reels, i.e. a so-called set, are removed from the machine. Next, the process continues by rewinding of a new set. These steps are repeated cyclically until the machine roll runs out of paper, whereby a change of machine roll is performed and the process is re-started by winding up a new machine roll.

[004] Traditional slitters comprise usually a number of circular disc-like rotary knives, which either overlap or engage a respective number of powered knives to provide a shearing action for slitting the continuous web of material pulled between the knives. The rotary upper slitting knives are not typically powered, but imparted with rotational motion via the powered lower knives. In addition, each rotary upper knife is arranged to be vertically adjustable in the frame structure of the slitter, which makes it possible to move the knife to a web slitting position and out of said position. [005] A long-term, continued and regular use of the slitter inherently results in damage and/or wear of the cutting edge of the upper knife, which requires regular replacement of the upper knives so as to not compromise the quality of the end product due to a knife that cuts poorly. The replacement of knives in traditional slitters has been a time-consuming and laborious process, as the slitter must be non- operational for an extended period of time.

[006] In some slitters, the securing assembly for the knives comprises a series of bolts and/or retaining ring arrangements that must be loosened or fully removed prior to the extraction of the damaged or dulled knife. Accordingly, the securing assemblies must be re-tightened after the replacement of the knife. An additional problem is experienced with the use of a bolted assembly, when the bolts loosen during the use of the knives, whereby there is a risk of ejection of the quick-rotating knives.

[007] US-B I -6,253,652 discloses a web slitter machine and particularly a securing assembly of its top blade. As described in the document, the section of the web slitter that slits the web of material comprises two discs essentially facing one another. The lower disc, the so-called bottom band, is powered. The rim of the bottom band comprises a fairly narrow cylindrical plane surface, whereas the rim of the upper disc, i.e. the so-called top blade, comprises a cutting edge. The blades are mounted with respect to one another so that the top blade in its radial direction slightly engages the side edge of the bottom band so as to provide a scissors-like cutting action between the knives. The US document discloses a very traditional securing of the top blade and in the replacement operation thereof, as soon as the top blade has become dull, the operator first raises the top blade away from the side edge of the bottom band and then replaces the top blade. The top blade is secured to the hub of the slitter by a threaded locking ring, which in turn is locked by a special screw so as to not rotate. When carried out like this, the replacement of the top blade requires manual work and is relatively time-consuming. In addition, special tools are required for unscrewing the locking ring and preventing the top blade from rotating while unscrewing the locking ring.

[008] In order to avoid long and costly replacement times of knives with bolt assemblies as well as safety hazards caused by the ejection of those knives, such an arrangement has been suggested, in which, among other things, the knife is kept against a support member of the knife assembly by means of compressed air. In such assemblies, a spring-loaded piston is arranged inside the rotary shaft of the knife. Clamp members are arranged in conjunction with the piston extending onto the shaft and against the knife. When the piston is exposed to the pressure of compressed air, the clamp members are urged tightly against the knife. As soon as the pressure is released, the springs pull the clamp members away from the knife to allow for the replacement of the knife. These kinds of solutions are disclosed for instance in the documents US-A I -2004149101 and US-A I -200318861 I .

[009] WO-A2-2006/086128 discloses a further improved version of the above- described securing assemblies. In other words, each upper knife is assembled in conjunction with a tubular-shaped housing attached to the vertically adjustable body part of the slitter's upper knife. One end of the tubular-shaped housing is tightly closed by a cap so that, while the tubular-shaped housing functions as a compressed air cylinder, the cap may act as a cylinder head. The opposite end of the tubular- shaped housing is open. The shaft of the upper knife is concentrically bearing- mounted inside the tubular-shaped housing so that the shaft may be moved by compressed air outwards against the spring pressure from inside the tubular-shaped housing. The shaft bearings are arranged so that their outer rims are supported onto low frictional sleeves located between the tubular-shaped housing and the bearing frames so that the outer rims of the bearings slide along the sleeves together with the shaft. The returning of the shaft into the tubular-shaped housing is accomplished by said spring. A support flange for the upper knife of the slitter is arranged at the shaft end. The opposite side of the support flange with respect to the shaft is provided with an annular protrusion, the inner surface of which forms a relatively wide cylindrical recess, into which a channel for compressed air is led via the shaft. The outer surface of the protrusion acts as a guide surface for the knife disc of the slitter to be mounted against the flange. A disc acting as a centrally-disposed piston is also arranged in said recess, in the middle of which disc a round shaft-like protrusion, which can be termed e.g. as the hub of the slitter, is located.

[0010] The knife of the slitter is kept in its position against the support flange by means of a retaining cap arranged on said shaft-like protrusion. For arranging the retaining cap onto the slitter's hub there is an annular groove arranged adjacent to the hub end, the width of which groove corresponds at least to the thickness of the retaining cap. The retaining cap, essentially its centre part, is provided with an elongated aperture so that the centre of the retaining cap is provided with a hole, the diameter of which corresponds to the diameter of the bottom of said annular groove and the side thereof with a hole that corresponds to the diameter of the hub so that the retaining cap may be first inserted through the larger hole in the retaining cap onto the hub and then, when the retaining cap coincides with the annular groove of the hub, sideways into the annular groove so that the retaining cap will be located, when carefully mounted, concentrically on the hub.

[001 1 ] To enable the above-described mounting of the retaining cap into its place, the disc comprising the hub has to be moved by compressed air against the load urged by cup springs so as to make the distance between the contact surface of the support flange against the upper knife and the retaining cap larger than the thickness of the knife. Then, the retaining cap can be easily slid into its place. When the air pressure is removed from behind the hub disc, the cup springs move the hub towards the support flange and press the upper knife between the retaining cap and the support flange.

[0012] Even if the solution disclosed in said WO document eliminates several problems related to prior art, a few disadvantages have, however, been observed in said solution, one of which being e.g. the fact that a cap that has been mounted sideways by sliding will easily be stuck in an intermediate position, and wobbles in the locked position causing instability for the rotation of the knife. In addition, the described securing is characterised in that the actual supporting of the retaining cap onto the hub is one-sided, and consequently, the retaining cap is pressed unevenly against the knife. Further, the mounting of the cap pressing the upper knife is laborious and the assembly is adequate only for knifes with the thickness of 3 mm. The supply of compressed air releasing the locking of the knife requires a special valve.

[0013] Thus, an object of the present invention is to provide a solution, in which the retaining cap is always settled concentrically with respect to the knife and the shaft- like protrusion.

[0014] A second object of the present invention is to provide a solution, in which the pressing force of the retaining cap against the knife is as uniform as possible. [0015] A third object of the present invention is to change the mounting of the retaining cap pressing the upper knife so as to be aligned with the centre line of the bearing assembly. In this way, the locking of the upper knife is made suitable for knife thicknesses that vary (2.5 - 4.5mm) much more than before. [0016] A fourth object of the invention is to simplify the mounting of the upper knife. In the quick-clamping arrangement according to the invention only a push and a twist parallel with the axis of the retaining cap are required for locking the upper knife into its place. [0017] A fifth object of the present invention is to ensure that it is easy to visually verify whether the upper knife is mounted correctly. This is easily achieved, since the retaining cap has to be always turned against a special stopper.

[0018] A sixth object of the invention is to provide a structure that allows only a correctly performed mounting of the upper knife. This is achieved by arranging apertures in the retaining cap and studs in the stopper end, which studs will engage the apertures only in case the mounting of the upper knife is correctly performed. [0019] At least some of said objects of the invention are achieved by means of the clamping arrangement in accordance with claim I .

[0020] Other, additional characteristic features of the invention, by which also other objects of the invention are achieved, are disclosed in the other claims and in the following description of the embodiments shown in the figures.

[0021 ] In the following, the clamping arrangement for a slitter knife according to the invention as well as its operation will be explained in more detail with reference to the appended schematic drawings, of which

Figures l a and I b show a knife assembly in a slitter winder according to prior art;

Figure 2a shows in more detail a quick-clamping arrangement for a slitter winder according to a preferred embodiment of the invention;

- Figure 2b shows in more detail a disc hub used in the quick-clamping arrangement for a slitter winder according to a preferred embodiment of the invention;

Figure 2c shows in more detail a retaining cap used in the quick-clamping arrangement for a slitter winder according to a preferred embodiment of the invention;

Figure 3 shows schematically a retaining cap used in the quick-clamping arrangement for a slitter winder according to a second preferred embodiment of the invention;

Figure 4 shows schematically a retaining cap used in the quick-clamping arrangement for a slitter winder according to a third preferred embodiment of the invention; and

Figure 5 shows schematically a retaining cap used in the quick-clamping arrangement for a slitter winder according to a fourth preferred embodiment of the invention.

[0022] Figures l a and I b show a securing arrangement for the upper knife in a slitter winder according to prior art. Each upper knife is arranged to be secured in conjunction with a tubular-shaped housing 2 attached to the vertically adjustable body part of the upper knife of the slitter winder. One end of the tubular-shaped housing 2 is tightly closed by a cap 4 so that, while the tubular-shaped housing 2 functions as a compressed air cylinder, the cap 4 may act as a cylinder head. The opposite end of the tubular-shaped housing 2 is open. The shaft 6 of the upper knife is concentrically bearing-mounted inside the tubular-shaped housing 2 so that the shaft 6 may be moved by compressed air outwards (to the left) against the pressure of the spring 8 from inside the tubular-shaped housing 2. The bearings 10 and 1 2 of the shaft 6 are arranged so that their outer rims are supported onto low-frictional sleeves 14 and 16 located between the tubular-shaped housing 2 and the bearing frames so that the outer rims of the bearings 10 and 1 2 slide along the sleeves 14 and 16 together with the shaft 6. The returning of the shaft 6 into the tubular-shaped housing 2 is accomplished by said spring 8. A support flange 18 for the upper knife of the slitter winder is arranged at the left end of the shaft 6. The opposite side of support flange 18 with respect to the shaft 6 is provided with an annular protrusion 20, the inner surface 22 of which forms a relatively wide cylindrical recess 24, into where a channel 26 for compressed air is led via the shaft 6. The outer surface of the protrusion 20 acts as a guide surface for the knife disc of the slitter winder to be mounted against the support flange 18. A disc 28 acting as a centrally-disposed piston is also arranged in said recess 24, in the middle of which disc a round shaft-like protrusion 30, which can be termed e.g. as the hub of the slitter, is located.

[0023] The knife of the slitter winder is kept in its position against the support flange 18 by a retaining cap 32 arranged on said shaft-like protrusion or hub 30. For arranging the retaining cap 32 onto the hub 30 of the slitter winder there is an annular groove 34 arranged adjacent to the end of the hub 30, the width of which groove corresponds at least to the thickness of the retaining cap 32. The retaining cap 32, essentially its centre part, is provided with an elongated aperture 36 so that the centre of the retaining cap 32 is provided with a hole 38, the diameter of which corresponds to the diameter of the bottom of said annular groove 34 and the side thereof with a hole 40 that corresponds to the diameter of the hub so that the retaining cap 32 may be first inserted through the larger hole 40 in the retaining cap 32 onto the hub 30 and then, when the retaining cap 32 coincides with the annular groove 34 of the hub 30, sideways into the annular groove 34 so that the retaining cap 32 will be settled concentrically on the hub 30. [0024] To enable the above-described mounting of the retaining cap 32 into its place, the disc 28 comprising the hub 30 has to be moved by compressed air against the load urged by cup springs 42 that remain between said disc 28 and the contact plate attached by means of threads onto the cylindrical wall of the space 24 so as to make the distance between the contact surface of the upper knife against the support flange 18 and the retaining cap 32 larger than the thickness of the upper knife. Then, the retaining cap 32 can be slid sideways into its place. When the air pressure is removed from behind the retaining cap 32, the cup springs 42 move the hub 30 towards the support flange 18 and press the upper knife between the retaining cap 32 and the support flange 18.

[0025] A quick-clamping arrangement for a slitter winder according to a preferred embodiment of the invention shown in Figures 2a and 2b is formed around a new type of a retaining cap 52. In other words, the clamping arrangement for the upper knife in a slitter winder that applies the invention in its bearing and operational solutions is to a great extent similar to the prior art arrangement shown in Figure l a. In other words, Figure 2a shows the shaft 6 of the upper knife and the channel 26 for compressed air led therethrough, while the rest of the support flange 48, the portion to the right, is not shown, as it is similar to the one shown in Figure l a. The support flange 48 of the clamping arrangement according to the invention is provided with a central annular protrusion 50, corresponding to the prior art support flange (reference number 1 8 in Figure l a), the radial dimension of which protrusion is, however, essentially larger than that of the prior art protrusion (reference number 20 in Figure l a). The outer surface of said protrusion 50 acts as a guide surface for the retaining cap 52 and the inner surface as a compressed-air cylinder, in which a hub disc 56 acts as a piston that moves the knife hub 54 and it attached thereto. The knife hub 56 is tightened with respect to the inner surface of said annular protrusion 50. A retaining end 60 is attached by screws 58 to the support flange 48, which end acts as one end of the compressed-air cylinder remaining inside the annular protrusion 50 of the support flange 48, while the other end is formed of the support flange 48. Cup springs 62 are arranged between the hub disc 56 and the retaining end 60, which springs press the hub disc 56 towards the support flange 48. The surface of the retaining end 60 facing the support flange 48 is preferably, but not necessarily, provided with one or several protrusions, preferably with round studs 64, and the corresponding apertures, preferably round holes 66, are found in the retaining end 52. [0026] The quick-clamping means for the upper knife of a slitter winder comprise a specially-shaped end portion 68 of the hub 54 and of a groove 70 located at the foot thereof, the width of which groove corresponds at least to the material thickness of the retaining cap 52. The portion of the hub 54 located on the right side of the groove 70 in Figure 2a is cylindrical, whereas the shape of the end portion 68 of the hub 54 located on the left side of the groove 70 appears best from Figu re 2b depicting nothing else but the hub disc 56. In other words, the end portion 68 of the hub comprises a centre part, the cross-section of which is preferably, but not necessarily, round and the diameter thereof corresponds to the diameter of the bottom of the groove 70, and (at least one arm) in this embodiment two arms 72 extending to opposite directions over the entire diameter of the hub, between which arms and the main portion of the hub there is a groove 70.

[0027] Figure 2c shows only the retaining cap 52, in which the apertures or holes 66 for the studs 64 of the retaining end 60 can be seen. The quick-clamping arrangement according to the invention is characterised in that the retaining cap 52 is preferably, but not necessarily, provided with a central aperture 74 for the end portion 68 of the hub 54 in the hub disc 56 shown in Figure 2b. The quick-clamping arrangement according to the invention works as long as the shape of the aperture 74 is the same as that of the end portion of the hub 54. In other words, the aperture 74 has preferably, but not necessarily, a round centre part and (at least one recess) in this embodiment two recesses 76 extending to opposite directions. In the embodiment of the figure, the lateral surfaces of the recesses 76 are parallel and the longitudinal axis of the recesses 76 themselves is radial. Naturally, the aperture is provided with a sufficient operational clearance so that the retaining cap 52 can be pushed over the end portion of the hub against the cylindrical end/foot portion of the hub 54. Thereafter, when the retaining cap 52 is turned (counter-clockwise in Figure 2c) with

5 respect to the end portion 68 of the hub, the parts, indicated by the reference number 78, of the retaining cap 52 slide into the groove 70 of the hub 54 and lock the retaining cap 52 at the hub 54 so that it is axially immobile, if the intention has been to make the fitting of the groove tight with respect to the parts 76 of the retaining cap 52. In any case, the retaining cap 52 is no longer allowed to move away

I 0 from the hub 54 due to the rotational form locking. If the aim is to facilitate the quick-clamping further, i.e. to prevent incomplete mounting of the retaining cap, the retaining cap 52 may be provided with stoppers 80 that rise further up from the level of the parts 78 and thus prevent the turning of the retaining cap 52 and the end portion 68 of the hub farther on with respect to one another.

I 5

[0028] The quick-clamping of the upper knife in a slitter winder according to the invention works so that compressed air is led to the right side of the hub disc 56 via the channel 26 for compressed air, when the aim is to replace the upper knife. The compressed air moves the hub disc 56 and its hub 54 to the left against the tension 0 of the cup springs 62 located between the retaining cap 60 and the hub disc 56, whereby also the retaining cap 52 attached to the hub 54 moves to the left. If the retaining cap 52 is locked peripherally in its place by means of pins 64 of the retaining end 60 to be engaged in the holes 66 of the cap 52, the compressed air moves the hub disc 56 and the retaining cap 52 to the left at least to the extent of dimension of 5 the pins 64. This way, the retaining cap 52 can be freely turned 90 degrees (clockwise in Figure 2c) so that it can be pulled away from the top of the hub 54. Subsequently, the upper knife can also be pulled to the left from the top of the protrusion 50 of the support flange 48. The installation of the upper knife is carried out in exactly opposite order, whereby the release of the compressed air from the right side of the 0 hub disc 56, carried out at the end, allows the cup springs 62 to move the hub disc 56, the hub 54 and the retaining cap 52 therewith to the right so that the upper knife will remain firmly between the support flange 48 and the retaining cap 52. The keeping of the upper knife peripherally in its place can, if so required, be ensured, in addition to the pressing of the cup springs 62, also by means of one or several studs 82 arranged in the support flange 48, for which stud/-s corresponding holes are naturally provided in the upper knife.

[0029] In the mounting phase it is naturally advantageous that the retaining end 60 is provided with pins 64, which should engage in the apertures 66 of the retaining cap 52. The use of pins 64 reveals immediately if the retaining cap 52 is not turned long enough or if it is turned too long, in case the retaining cap 52 is not provided with the stoppers 80 shown in Figure 2c. Then, the cap 52 will remain carried by the pins 64 after the release of pressure, whereby the person replacing the knife will easily notice that the knife assembly is not in order and will perform the required reparation. Further, it is obvious that said pair of a pin and an aperture may also be arranged so that said at least one pin is located on the surface of the retaining cap 52 facing the support flange 48 and that at least one recess for said pin is located at the retaining end 60.

[0030] Figure 3 shows, very schematically, a retaining cap 52' according to a second preferred embodiment of the invention and a mounting aperture 74' for the cap 52' located in the middle thereof. The mounting aperture 74' is in this embodiment provided with two recesses, as also in Figure 2c, but in this embodiment the lateral surfaces of both recesses are radial. The turning movement required in the mounting is, as also in the above, 90 degrees unless a special stopper is used. When a stopper is used, the turning movement will naturally be somewhat smaller.

[0031 ] Figure 4 shows, very schematically, a retaining cap 52" according to a third preferred embodiment of the invention and a mounting aperture 74" located in the middle thereof. The mounting aperture 74" has in this embodiment three recesses so that the lateral surfaces of each recess are radial. The turning movement in the mounting is in this embodiment, as also in the next embodiment, 60 degrees or less depending whether there is a stopper or not. [0032] Figure 5 shows, very schematically, still another retaining cap 52"' according to a fourth preferred embodiment of the invention and a mounting aperture 74"' located in the middle thereof. The mounting aperture 74"' has in this embodiment three recesses so that the lateral surfaces of each recess are parallel. In addition, the lateral surfaces of the arms are axially parallel with the arms, and the axes of the arms are radial.

[0033] On the basis of the above, it is thus apparent that it is characteristic to all the embodiments of the quick-clamping arrangement according to the invention that the mounting of the retaining cap 52 on the hub 54 can be performed in axial direction, that the retaining cap is provided with an out-of-round apertu re 74, and that accordingly, the cross-sectional shape of the end portion 68 of the hub of the upper knife corresponds essentially to the out-of-round aperture of the retaining cap 52. In other words, the shape of the end portion 68 corresponds essentially to the shape of the aperture 74 in the retaining cap 52, when the diameter of the preferably round centre part of the end portion is, to the extent of the mounting clearance, smaller than the diameter of the preferably round centre part of the aperture, the shapes of said centre parts are essentially the same, the number of recesses in the aperture is the same as the number of arms in the end portion of the hub and the size of the recesses is (possibly much) larger than the size of the arms of the end portion of the hub at least to the extent that the arms will go through the apertures, and when the end su rface of the recess of the apertu re in the retaining cap is located at the distance of at least the radius of the hub from the centre of the aperture. Moreover, it is essential to the invention that the securing of the retaining cap 52 onto the hub is performed by means of a turning movement so that the section 78 between the recesses of the hole restricting the central aperture 74 in the retaining cap 52 is bent into the groove 70 in the hub 54 of the upper knife. Thus, it is clear that the shape of the central aperture in the retaining cap 52 may differ even a lot from the above- described embodiments. The operation of the quick-clamping arrangement requires only that the cross-sectional shape of the end portion of the hub of the upper knife corresponds to the shape of said aperture and that the end portion of the hub is provided with a groove, into which the section restricting the aperture of the retaining cap can be bent.

[0034] A security system is also included in the quick-clamping arrangement according to the invention for preventing the release of the locking of the upper knife between the support flange and the retaining cap, while the upper knife is lowered down into its cutting position. As explained in the above, compressed air is required for releasing the locking. Now, in the security system according to the invention both the moving of the upper knife to its cutting position and the release of the locking of the upper knife are provided with valves, respectively. The valves are connected so that the valve releasing the locking of the upper knife gets compressed air only in case the upper knife is lifted away from its cutting position. The valve that controls the locking of the upper knife gets its supply of compressed air through the valve that guides the upper knife to the cutting position. The valve that controls the lifting and descending of the upper knife is a standard 5/2 valve and the valve that controls the release of the locking of the upper knife is a standard 3/2 valve.

[0035] It is to be noted that only a few most advantageous embodiments of the invention are described in the above. Thus, it is clear that the invention is not limited to the above-described embodiments, but may be applied in many ways within the frame of the appended claims. The features described in conjunction with the different embodiments may be used in conjunction with other embodiments as well and/or various combinations of the described features may be made within the frame of the basic idea of the invention, if so desired, and if technical feasibility for this exists. Thus, it is also clear that even if the use of compressed air is suggested for the various tasks of releasing and moving the upper knife in the above, it is also quite possible to use hydraulic systems, which possibility is covered in the appended claims by the use of the term 'pressure fluid'.

Claims

1. A quick-clamping arrangement for the upper knife in a slitter winder, where the upper knife of the slitter winder is locked into its place by pressing the

5 upper knife by a retaining cap (52) against a support flange (48) arranged on the shaft (6) of the upper knife, where the hub (54) of the upper knife is provided with a hub disc (56) that is movable by means of pressure fluid against spring pressure and where the end portion (68) of the hub is provided with a groove (70) for the retaining cap (52), characterised in that the joint between the retaining cap (52)

I 0 and the hub (54) is rotationally form-locked.

2. A quick-clamping arrangement for the upper knife in a slitter winder according to claim I , characterised in that the retaining cap (52) is provided with an out-of-round aperture (74, 74', 74", 74"') that consists of a centre part and one

15 or several recess/-es (76) projecting therefrom.

3. A quick-clamping arrangement for the upper knife in a slitter winder according to claim 2, characterised in that the essential parts of the cross-sectional shape of the end portion (68) of the hub (54) correspond to the shape of the 0 aperture (74, 74', 74", 74"') in the retaining cap (52) so that it comprises a centre part and one or several arm/-s (72) projecting therefrom.

4. A quick-clamping arrangement for the upper knife in a slitter winder according to anyone of the preceding claims, characterised in that the retaining cap 5 (52) is provided with one or several stoppers (80) arranged adjacent to the centre part of the aperture (74).

5. A quick-clamping arrangement for the upper knife in a slitter winder according to anyone of the preceding claims, characterised in that the support 0 flange (48) is provided with an annular protrusion (50) on the opposite side thereof with respect to its shaft (6), inside of which protrusion a pressure fluid cylinder is formed, in which cylinder the hub disc (56) acts as a piston.

6. A quick-clamping arrangement for the upper knife in a slitter winder according to anyone of the preceding claims, characterised in that the support flange (48) is provided with an annular protrusion (50) on the opposite side thereof with respect to its shaft (6), to the opposite side of which protrusion with respect to

5 the support flange (48) a retaining end (60) is attached.

7. A quick-clamping arrangement for the upper knife in a slitter winder according to claim 6, characterised in that the retaining end (60) is provided with one or several pin/-s (64), and that the retaining cap (52) is provided with one or

I 0 several aperture/-s (66) for the pins (64) of the retaining cap (60).

8. A quick-clamping arrangement for the upper knife in a slitter winder according to claim 6, characterised in that the retaining end (60) is provided with one or several recess/-es, and that the retaining cap (52) is provided with one or

15 several pin/-s for the recesses of the retaining end (60).

9. A quick-clamping arrangement for the upper knife in a slitter winder according to anyone of the preceding claims, characterised in that the aperture (74, 74', 74", 74"') in the retaining cap (52) is concentric and that the recesses of the 0 aperture are located concentrically with respect to the centre part of the aperture.

10. A quick-clamping arrangement for the upper knife in a slitter winder according to anyone of the preceding claims, characterised in that the cross- section of the end portion (68) of the hub (54) consists of a centre part and one or 5 several arm/-s (72) projecting therefrom.

1 1. A quick-clamping arrangement for the upper knife in a slitter winder according to claim I , characterised in that the arms of the end portion (68) of the hub (54) are located concentrically with respect to the centre part of the end 0 portion (68).

12. A quick-clamping arrangement for the upper knife in a slitter winder according to claim I , characterised in that the locking of the upper knife between the support flange (48) and the retaining cap (52) is arranged by means of cup springs (62), which are located between the hub disc (56) and the retaining end (60).

5

1 3. A quick-clamping arrangement for the upper knife in a slitter winder according to claim 12, characterised in that the release of the locking of the upper knife is prevented by arranging the space on the opposite side of the springs (62) of the hub disc (56) so that it is pressure-free when the upper knife is in the cutting

I 0 position.

14. A quick-clamping arrangement for the upper knife in a slitter winder according to claim I , characterised in that on one hand the moving of the upper knife between the upper position and the lower cutting position, and on the other

I 5 hand the release of the locking of the upper knife are both controlled by their respective pressure fluid valves.

15. A quick-clamping arrangement for the upper knife in a slitter winder according to claim 14, characterised in that when the upper knife is in the cutting 0 position, the valve controlling the moving of the upper knife keeps the valve that releases the locking of the upper knife in a pressure-free state.

16. A quick-clamping arrangement for the upper knife in a slitter winder according to claim 14, characterised in that when the upper knife is in the upper 5 position, the valve controlling the moving of the upper knife supplies pressure fluid to the valve that releases the locking of the upper knife.

17. A quick-clamping arrangement for the upper knife in a slitter winder according to claim 14, characterised in that the valve that controls the locking of 0 the upper knife gets its supply of pressure fluid through the valve that guides the upper knife to the cutting position.

18. A quick-clamping arrangement for the upper knife in a slitter winder according to claim 14, characterised in that the valve that controls the moving of the upper knife is of 5/2 type. I 9. A quick-clamping arrangement for the upper knife in a slitter winder according to claim 14, characterised in that the valve that controls the locking of the upper knife is of 3/2 type.