WO2009095176A1

WO2009095176A1 - Device for the detachable mounting of a winding sleeve

Info

Publication number: WO2009095176A1
Application number: PCT/EP2009/000373
Authority: WO
Inventors: Holger Kröger
Original assignee: E.C.H. Will Gmbh
Priority date: 2008-01-29
Filing date: 2009-01-22
Publication date: 2009-08-06
Also published as: DE102008006612A1

Abstract

A device for the one-sided accommodation and for the detachable mounting of a winding sleeve (2) of a roll (4) made of web-shaped material, particularly an interior sleeve of a paper roll or the like, on a drivable shaft end of a rotary shaft (8) of a processing machine, having a base body (14) that can be mounted to the shaft end and that can be rotated about a first rotational axis (X), said body having at least one curve segment (24, 26) comprising a curve guide (24a, 26a), which extends peripherally in an angular, preferably approximately perpendicular plane spanned to the first rotational axis (X), and having at least one clamping element (28, 34), which is both in displaceable engagement with the curve guide (24a, 26a) of the at least one curve segment (24, 26) and can be brought in contact with an interior side (2b) of the winding sleeve (2), wherein the base body (14) and the at least one clamping element (28, 34) can be rotated about a second rotational axis relative to each other. What makes the invention special is that the peripherally extending curve guide (24a, 26a) of the at least one curve segment (24, 26) is arched across the entire length thereof and has a distance to the second rotational axis that can be varied across the entire length thereof.

Description

Hamburg, January 22, 2009

Our sign: WH 239-02WO JK / pθt

Direct dialing: 040/309 744 33

Applicant / owner: E. C. H. Will GmbH

Official file: subsequent application

E.C.H. Will GmbH

Nedderfeld 100, 22529 Hamburg

Device for detachably holding a winding tube

The invention relates to a device for one-sided recording and releasably holding a winding tube of a roll of sheet material, in particular an inner sleeve of a paper roll or the like., On a driven shaft end of a rotating shaft of a processing machine, with a shaft end and rotatable about a first axis of rotation Basic body, which has at least one curve segment with a cam guide which rotates in an angular, preferably approximately rectangular, plane spanned to the first axis, and at least one clamping element, on the one hand in sliding engagement with the cam guide of the at least one cam segment and on the other hand in abutment an inside of the angle sleeve can be brought, wherein the base body and the at least one clamping element about a second axis of rotation, against each other are rotatable.

Rolled up web-like material, such as paper, is rolled up on cores and is delivered in this condition. The cores, which are also referred to as inner sleeves or core tubes, usually consist of cardboard, hard fibers or plastic. These rolls must then be used to unroll the sheet material for further processing in a processing machine, which in the case of paper is usually a cutting and / or printing machine, be brought in this provided holding devices of the type mentioned. Usually, two such devices are provided which are spaced apart to releasably support the winding tube on both sides and thus to form a bearing for both ends of the winding tube. In contrast, at lower working widths usually only on one side of such a device with a chuck and on the other side only a mandrel is provided.

For the releasable holder of the main body is inserted into the respective end of the winding tube and brought by means of clamping elements in frictional engagement with the inside of the winding tube. Usually this case, the winding tube is centered at the same time, so brought into coaxial alignment with the axis of rotation of the rotating body and the rotary shaft to avoid a particular caused by imbalance and to change web tension leading, irregular rolling behavior.

The main body is attached to the shaft end of a rotating shaft of the processing machine and forms, together with the rotary shaft, a bearing for the winding tube. The clamping elements are usually essentially radially movable clamping jaws. The main body together with the clamping elements accordingly a chuck, which also applies to the rest of the device of the type mentioned.

If a web tension required for the processing process is to be generated during unrolling, the rotating roller must be subjected to a braking torque required for this purpose. Accordingly, a corresponding brake device acts on the rotary shaft and thus on the clamping head or the device of the type mentioned.

For chucks, a distinction is made between permanently exciting and mechanically expanding chucks.

With permanently exciting clamping heads, the clamping jaws are actuated by externally introduced forces, which are generated for example by compressed air, screws or springs.

Mechanically expanding chucks exploit the braking torque transmitted by the braking devices to the winding tube to expand. For this purpose, the device of the type mentioned can be used. For this purpose, the

Base body at least one curve segment, which provided with a curve guide is, which rotates in an angle, preferably approximately at right angles, to the axis of rotation of the body spanned plane. The at least one tensioning element is on the one hand in sliding engagement with the curve guide of the curve segment. This engagement can be permanent and can be achieved, for example, by the clamping element being held in displaceable engagement with the cam guide by external forces, such as, for example, spring forces. By "slidable engagement" is meant that the tensioning element is indeed held in the cam guide, but is movable along the cam guide. On the other hand, the clamping element can be brought into contact with the inside of the winding tube to get into clamping engagement with this. Accordingly, the clamping element between a relaxed position or rest position in which the clamping element is out of engagement with the winding tube, and a clamping or working position can be brought, in which the clamping element is in frictional or clamping engagement with an inner side of the winding tube , To pass the clamping element between these two positions, the cam guide has a corresponding course. Accordingly, the curve guide takes over the task of a slotted guide. Also structurally, the curve guide can be designed as a slide guide. Usually, the cam guide forms a circumferential cam surface, which is formed by the circumference of the cam segment and with which the clamping element is in sliding contact. Thus, in functional terms, the cam guide is also to be equated with a cam guide or surface. Usually several clamping elements are arranged distributed uniformly over the circumference of the body.

Now, if the web is pulled off the roll, the roll and thus also the winding tube starts to turn. In order to keep the withdrawn from the roll of material web under tension, to be transmitted by the aforementioned braking device, a braking torque on the rotary shaft and the clamping device formed by the device of the type mentioned above with body and clamping elements on the role. In this case, the base body is rotated relative to the clamping elements. As a result, the cam segments and thus their cam guide a movement relative to the clamping elements are subjected, which has due to a correspondingly suitable course of the cam guide result in that the clamping elements pressed outward and thereby from their withdrawn relaxed position or rest position in their Klemmbzw. Working position to be moved radially outward and thus reach a positive connection and possibly also positive engagement with the inside of the winding tube.

US 2005/0224627 A1 discloses a self-tensioning clamping head for internal clamping of paper rolls in accordance with the device of the aforementioned type - A -

known clamping head also has a cylindrical base body, which is provided on its circumference with three annularly arranged, offset by 120 ° and extending over each 60 ° extending flats or flat surface portions, which take on the task of a curve guide. Extending radially outwards, three clamping jaws offset by 120 ° along the circumference of the basic body are arranged, each having a concave inner surface lying inside. The curvature of these concave surfaces is so strong that their radius is smaller than the distance to the axis of rotation of the main body. Between the flat surface portions of the body and the concave inner surfaces of the jaws rollers are arranged. By rotating the body about its axis of rotation relative to the jaws these are moved outwards and thereby tension the winding tube of a paper roll.

It is an object of the present invention to improve a device of the type mentioned in such a way that the clamping of the at least one clamping element can be structurally simpler and at the same time realized more effectively.

Proposed according to the invention to solve this problem, a device for one-sided recording and releasably holding a winding tube of a roll of web-shaped material, in particular an inner sleeve of a paper roll or the like., On a driven shaft end of a rotary shaft of a processing machine, fastened with a shaft end and a base body rotatable about a first axis of rotation, which has at least one curve segment with a curved guide, which rotates in an angular, preferably approximately rectangular, plane spanned to the first axis of rotation, and with at least one clamping element, on the one hand in sliding engagement with the curve guide of the at least one Curve segment and on the other hand in abutment with an inner side of the angle sleeve can be brought, wherein the base body and the at least one clamping element about a second axis of rotation, against each other are rotatable, characterized in that the circumferential curve guide of the minde Stens a curve segment is curved over its entire length and has a varying over its entire length distance from the second axis of rotation.

While in the prior art, the curve guide of the curve segments alternately three curved and three planar surface portions which extend in a plane perpendicular to the axis of rotation, now proposes the invention to give the circumferential curve guide the at least one curve segment in the form of a closed continuous curve, which so contains no discontinuities and both the first axis of rotation, which forms the axis of rotation of the rotating body, as well as the second axis of rotation about which the base body and the at least one clamping element are rotatable against each other surrounds.

Conceivable are both a symmetrical and an asymmetric waveform and can have individual curve sections, if necessary, a non-constant curvature, a constant curvature or a straight line. As suitable and preferred symmetrical waveforms with two symmetry axes, the ellipse and the lamellar oval may be mentioned here by way of example. As further suitable and preferred symmetrical waveforms with a single axis of symmetry, the so-called eggline and the Cartesian oval may be mentioned here by way of example.

Furthermore, composite plane curves also fall under the definition given here; an example is a closed curve, which has a semicircle and a parabolic section or two mirror-symmetrically assembled parabolic sections. As an example of an asymmetric waveform, a curve is given which has different circular arc sections with different radii. Of course, also curve segments with individually constructed waveforms, which differ from the aforementioned known forms, produce and use according to the invention for the device mentioned above.

Due to the formation of specific and essentially continuously changing circumferential curvatures, different adjustment paths of the tensioning elements as well as different tensioning force courses can be predeterminably implemented with respectively corresponding curve segments. Furthermore, because of the possibility of an optional arrangement of each of the curve segments in a separate plane an adjustment can be achieved, which is a multiple of the adjustment of known chucks. Along with the larger adjustment can also be realized with the same radial clamping path a flatter clamping force curve. Thus, the invention provides the possibility of a particularly simple, fast and at the same time effective and structurally easy to implement handling of a clamping element for internal clamping of a winding tube of a roll of sheet material.

Preferred embodiments and further developments of the invention are specified in the dependent claims.

Thus, preferably, the base body, in particular an annular circumferential stop, the radial extent of which is greater than the inner radius of the angle sleeve is. In a further development, the stop in a one-piece design can also be part of the base body.

In particular, when the circumferential cam guide is a circumferential cam guide, which is formed by the circumference of the cam segment and on which abuts the at least one clamping element with a surface portion, the invention provides a structurally particularly simple way for the design of the clamping element. For it is sufficient, for example, that the surface portion, with which the clamping element bears against the cam surface, need only consist of an approximately flat surface, which is preferably oriented approximately at right angles to the radial direction with respect to the axis of rotation and thus extends parallel to the axis of rotation , Despite this simple construction, however, results in an effective sliding contact of the clamping element with the curve guide.

The first axis of rotation, which forms the axis of rotation of the base body, and the second axis of rotation about which the base body and the at least one clamping element are rotatable against each other, depending on the design may optionally coincide or extend at a distance parallel to each other.

It is conceivable to assign only a single clamping element of the cam guide in at least one cam segment, so that in each case only a single clamping element is in displaceable engagement with the cam guide of a cam segment.

However, at least two clamping elements of the cam guide may also be associated with at least one cam segment, so that at least two clamping elements are jointly in sliding engagement with the cam guide of a cam segment. For even distribution over the circumference of the main body, the angular sections between two adjacent clamping elements should be approximately equal. From this latter development follows that, in the event that the cam guide are assigned at least one cam segment only two clamping elements, these are offset by approximately 180 ° to each other and thus are arranged approximately diametrically opposite with respect to the axis of rotation.

A further particularly preferred embodiment, in which the base body has at least two curve segments, which are arranged side by side or spaced apart in the direction of the axis of rotation, is characterized in that the ellipse, which forms the shape of the curve guide at least one curve segment, offset at an angle aligned with the ellipse, which is the shape of the curve guide forms at least one further curve segment. Such an embodiment allows the achievement of a higher and possibly even balanced distributed Spannbzw. Clamping force. In a further development, at least one first group of curve segments and a second group of curve segments are provided instead of individually arranged curve segments, so that curve segments are combined to form a first group and further curve segments at least to a second group, wherein in each group the curve guides the same Have alignment with respect to the axis of rotation. The angle may preferably be about 90 °, so that the ellipses are approximately at right angles to each other.

In a further development, two curve segments and four clamping elements may be provided, wherein the curve guide each curve segment are associated with two clamping elements which are approximately diametrically opposed with respect to the axis of rotation. Such an arrangement can be realized in the same way even when using two groups of curve segments.

The angle may for example be about 120 °. In this case, it is advantageous to provide, for example, only three cam segments and three offset with respect to the axis of rotation about 120 ° to each other arranged clamping elements, of which a clamping element of the cam guide of a cam segment is assigned. The same arrangement can be realized even when using three groups of curve segments.

The main body can be provided as part integrally connected to the rotary shaft.

In a particularly preferred embodiment, the circumferential curve guide of the at least one curve segment has the shape of an ellipse. The elliptical shape has the advantage that due to their initially relatively large pitch, the clamping element can move out of its relaxed position or rest position very quickly and can be pushed outward, thereby spent in a very short time in the vicinity of its clamping or working position can be. Since the slope of an ellipse to the outside decreases sharply, the clamping element can be due to the now relatively low slope of the cam guide with relatively moderate effort or torque, but effectively press into its clamping or working position. Another advantage is that an elliptical curve guide can be realized structurally particularly simple. Hereinafter, preferred embodiments of the invention will be explained in more detail with reference to the accompanying drawings. Show it:

Figure 1 shows schematically a part of a processing machine with a device for releasably holding a winding tube, is wound on the web material.

2 in a more detailed representation of a clamping head inserted into one end of the winding tube according to a first preferred embodiment of the invention in a longitudinal section according to Figure 2a and in cross section according to Figure 2b along the dash-dotted line bb shown in Figure 2a, with the jaws in their be in the relaxed position or in the withdrawn position of rest;

Fig. 3 in a more detailed representation of a clamping head inserted into one end of the winding tube according to the first preferred embodiment of the invention in longitudinal section according to Figure 3a and in cross section according to Figure 3b along the dash-dotted line bb shown in Figure 3a, with the jaws short in a position before reaching their clamping or working position;

4 shows an enlarged view of a clamping jaw and its storage. and

Fig. 5 shows a second preferred embodiment of a clamping head inserted into the end of a winding tube in cross section, wherein the clamping jaws are in their clamping or working position.

In Figure 1, a winding tube 2 is shown schematically, on the web-shaped material is wound into a roll 4. Since the winding tube 2 is located inside the roller 4 and this carries, it is also referred to as an inner sleeve or core tube. Preferably, the winding tube 2 made of cardboard, hard fibers or plastic.

The web-shaped material wound up into the roll 4, which is not shown in detail in FIG. 1, is delivered in this state and processed in a processing machine not shown in the figures. In particular, when the sheet-like material is made of paper, the processing machine is, for example, a cutting and / or printing machine. For unwinding the web-like material from the roll 4 for subsequent processing, the roll 4 must be rotatably supported. the. For this purpose, in each of the two open ends 2a of the winding tube 2, a clamping head 6 is inserted, which is coaxially mounted on a rotary shaft 8, which is rotatably mounted on a stand 10, as Figure 1 shows schematically. The clamping head 6, the rotary shaft 8 and the stator 10 according to FIG. 1 thus form a rotatable support for the winding tube 2 and the roller 4 carried by it.

Specifically, it is the chuck 6 to a device for releasably holding the winding tube 2, which will be explained in more detail below. Since the winding tube 2 and thus the roller 4 is to be stored on both sides, the above-described arrangement of the clamping head 6, rotary shaft 8 and stator 10 is provided on both sides, as shown in FIG.

In order to generate a tension in the material web required for the subsequent processing (not explained in detail in the description and not shown in the figures) during the unrolling of the roller 4, a braking torque must be exerted on the winding tube 2. For this purpose, a braking device 12 is coupled to at least one rotary shaft 8.

Further details of the clamping head 6 according to a first preferred embodiment are shown in Figures 2 and 3, wherein the description of the clamping head 6 is first based on the figure 2.

The clamping head 6 has a rotary body 14 which sits on the rotary shaft 8 and is secured thereto. Since the rotary shaft 8 is rotatably mounted about the common axis of rotation X, this also applies to the rotary body 14.

At the free (according to Figure 2a right) end of the rotary body 14, an end cap 16 is arranged, which has the shape of a truncated cone. Such a shape facilitates the insertion of the chuck 6 in an open end 2a of the winding tube 2. The end cap 16 is fixed to a first annular collar 18 which is rotatably mounted on the rotary body 14 or the rotary shaft 8. Spaced apart from this first annular collar 18, a second annular collar 20 is rotatably mounted on the rotary body 14 or the rotary shaft 8, as shown in FIG. 2a. This second annular collar 20 is adjacent to an annular stop 22 which is mounted on the rotary shaft 8. As can be seen Figure 2a, the outer diameter of the annular stopper 22 is greater than the inner diameter of the winding tube 2, so that upon insertion of the clamping head 6 in the open end 2a of the winding tube 2, the annular stop 22 in abutment with the end face of the open end 2a Winding tube 2 can be brought. By the Arrangement of the annular stop 22 is thus defined a certain penetration depth for the chuck 6 in the winding tube 2, thereby preventing the chuck 6 can be inserted with the rotary shaft 8 too far into the winding tube 2; otherwise there is a risk that the roller 4 with its corresponding end face in contact with the stand 10 and thereby the web-like material can be damaged.

Between the two annular collar 18 and 20, the rotary body 14 in the illustrated embodiment 6 curve segments. As can be seen in FIG. 2 a, the curve segments are combined in a first group of three first curve segments 24 and in a second group of three second curve segments 26 in the exemplary embodiment shown. As can be seen in FIGS. 2a and 2b, the curve segments 24, 26 form disc-shaped sections in the illustrated embodiment, which have the shape of an ellipse in cross-section (FIG. 2b).

In the illustrated embodiment, the first curve segments 24 of the first group coincide in their orientation and shape. The same applies to the second curve segments 26 in the second group. However, the first group of the first curve segments 24 differs from the second group of the second curve segments 26 by a different angular orientation with respect to the rotation axis X. Namely, as can be seen in Figure 2b, namely, the ellipse forming the shape of the first curve segments 24, offset by an angle of 90 ° relative to the ellipse, which forms the shape of the second curve segments 26.

In each of the curve segments 24, 26, the circumference forms a circumferential strip-shaped cam surface 24a or 26a, which rotates elliptically in the manner of a circumferential cam guide in a plane spanned at right angles to the axis of rotation X. As will be explained in more detail below, the circumferential cam surface 24a or 26a formed by the circumference of the curve segments 24, 26 takes over the task of a cam surface or slide guide.

As can be seen from FIG. 2 a, two first clamping jaws 28 are provided, which are arranged on the outer side of the rotary body 14 and are diametrically opposed with respect to the axis of rotation X. As can be seen in particular Figure 4, each jaw 28 is provided in the illustrated embodiment with three in the direction of the rotation axis X spaced projections 30. On both sides of these projections 30 recesses 32 are formed. At its free end, the projections 30 with a plane surface portion 30 a, which extends in relation to the axis of rotation X in the axial direction. The projections 30 are formed and spaced from each other such that each of these projections 30 of the first clamping jaws 28 rests with its surface portion 30 a on the circumferentially formed circumferential cam surface 24 a of the first curve segments 24. The recesses 32 formed adjacent to the projections 30 serve to receive the second curve segments 26 without physical contact taking place. By forming the recesses 32, therefore, engagement of the second cam segments 26 with the first clamping jaws 28 is to be prevented. Rather, the second curve segments 26 should be able to move unhindered past the first clamping jaws 28 through the cutouts 32. Accordingly, the first clamping jaws 28 are supported by means of the projections 30 in the illustrated embodiment only of the first group of the first curve segments 24.

As can be seen in FIG. 2a, two second clamping jaws 34 are provided in addition to the two first clamping jaws 28 in the exemplary embodiment shown. The two second clamping jaws 34 basically have the shape of the first clamping jaws 28 and are also arranged in the same way, but with the difference that they are supported in the illustrated embodiment only by the second group of the second curve segments 26. Accordingly, the projections of the second clamping jaws 34, which are formed according to the projections 30 of the first clamping jaws 28, in abutment against the cam surfaces 26a of the second cam segments 26. In contrast, serve at the second jaws 34 provided between the projections recesses, the are formed corresponding to the recesses 32 of the first clamping jaws 28, for non-contact receiving the first cam segments 24th

As can be seen from FIG. 2 in conjunction with FIG. 4, the clamping jaws 28, 34 have a substantially cuboidal basic shape whose long side extends parallel to the axis of rotation X. In this case, Figure 2b shows that the clamping jaws 28, 34 in the illustrated embodiment in cross section form a rectangle extending in the radial direction and thus are relatively narrow. Thus, the clamping jaws 28, 34 with respect to the rotation axis X and the rotary body 14, so to speak 'upright' or arranged upright in the radial direction.

Since the clamping jaws 28, 34 lie between the rotary body 14 and the inner side 2b of the winding tube 2, they have a first end 28a and 34a, which adjacent to the inside 2b of the winding tube 2 is located. The first end 28 a and 34 a of the clamping jaws 28, 34 forms a convex surface, as shown in FIG. Working position of the jaws 28, 34 to achieve a flat contact with the inside 2b. Furthermore, FIG. 2 b shows, on the basis of the second clamping jaws 34, that the clamping jaws 28, 34 have a second end, with which they rest against the encircling cam surface 24 a or 26 a of the associated cam segments 24 and 26. The second end is formed by the flat surface portions indicated by the reference numeral "30a" in the clamping jaw 28 in Figure 4. In Figure 2b, only the second end 34b of the second jaws 34 is visibly shown, and it will be further understood that In the illustrated embodiment, the second end of the jaws 28, 34 forms the substantially planar surface which is oriented at right angles to the radial direction with respect to the axis of rotation X. Thus, the second end of the jaws 28, 34 forms a 'blunt' end with which the clamping jaws 28, 34 are in sliding or sliding contact with the elliptically encircling cam surfaces 24a and 26a of the first and second cam segments 24 and 26, respectively.

As can be seen from FIG. 2b, not only two groups of curve segments 24 and 26 but also two groups of clamping jaws 28, 34 are provided, each group consisting of two clamping jaws and therefore a pair of clamping jaws in the illustrated embodiment. In each group, the two jaws are diametrically opposite with respect to the rotation axis X and the rotary body 14. In this case, the alignment of the first pair of the first clamping jaws 28 offset by 90 ° with respect to the rotation axis X relative to the second pair of the second jaws 34, so that a total of all four jaws 28, 34 form a cross-shaped arrangement, as Figure 2b reveals ,

The arrangement of the clamping jaws 28, 34 on the one hand and the rotary body 14 with the curve segments 24, 26 on the other hand are mounted to rotate about the common axis of rotation X against each other. If the rotary body 14 is secured against rotation on the rotary shaft 8, the arrangement of the clamping jaws 28, 34 is also rotatable relative to the rotary shaft 8 about the axis of rotation X. This requires a rotary mounting of the arrangement of Spannba- sets 28, 34 on the rotary shaft 8. Such storage is taken in the illustrated embodiment of the first and second annular collar 18, 20, which are rotatably mounted on the rotary shaft 8 and between them the jaws 28, 34 such that the clamping jaws 28, 34 are arranged fixed in relation to the common axis of rotation X in the axial direction, but remain movable in the radial direction. The axially fixed arrangement is achieved in that the first and second annular collar 18, 20 loosely abut against the respectively adjacent end faces of the clamping jaws 28, 34, as shown in FIGS. 2a and 4 with reference to the first clamping jaw (s) 28. The radially movable mounting of the clamping jaws realized in the illustrated embodiment by axially arranged pins 36 which are secured in the first and second annular collar 18, 20 and project into radial longitudinal slots 38 in the end faces of the clamping jaws 28, 34 are formed, as shown in Figure 4 on the basis of the jaw 28. The depth and width of the longitudinal slots 38 depends on the length and the diameter of the protruding from the first and second annular collar 18, 20 portion of the pins 36, while the length of the longitudinal slots 38 in response to the desired movement stroke of the clamping jaws 28, 34 in Radial direction is selected.

Since not only the first pair of the first jaws 28 offset by an angle of 90 ° relative to the second pair of the second jaws 34 is arranged, but also the first group of the first curve segments 24 also offset at an angle of 90 ° relative to the second group second curve segments 26 is aligned and thus also like the two groups of curve segments 24, 26 together form a cross-shaped arrangement, as can be seen Figure 2b, results in a rotational position of the rotary body 14 relative to the clamping jaws 28, 34, as shown in Figure 2 , In this situation, the clamping jaws 28, 34 lie with their second end on that peripheral portion or portion of the cam surface 24a and 26a of the first and second cam segments 24 and 26, which has the smallest radial distance from the common axis of rotation X. In this rotational position thus take the jaws 28, 34 from the inside of the 2b of the winding tube 2 farthest position in which they are at a distance from the inner side 2b of the winding tube 2, which corresponds to the relaxed position or rest position, causing the chuck in relaxed state.

If now, starting from the rotational position shown in FIG. 2, the rotary body 14 is subjected to a rotational movement, for example in the direction of the arrow A according to FIG. 3, the rotational position of the arrangement likewise changes from the first and second groups of the curved segments 24, 26 This also takes place a movement of the elliptical circumferential cam surfaces 24a, 26a of the cam segments 24, 26 with respect to the second ends 28b, 34b of the clamping jaws 28, 34 instead; ie the cam surfaces 24a, 26a run along the adjacent second ends of the clamping jaws 28, 34, wherein the cam surfaces 24a, 26a continue to abut the second ends 28b, 34b of the clamping jaws 28, 24. The second jaws 28b, 34b of the clamping jaws 28, 34 thus now come into contact with sections of the elliptical cam surfaces 24a, 26a, which lie at an increasing radial distance from the axis of rotation X. As a result of the elliptical course of the curved surfaces 24a, 26a formed on the circumference of the curve segments 24, 26, due to the increase in the radial distance, the clamping jaws 28, 34 are pressed outward in the radial direction, as shown in FIGS. 3a and b to show the arrows not marked there. Thus, the clamping jaws 28, 34 are brought with their first end 28a and 34a into contact with the inner side 2b of the winding tube 2 and with continued movement in clamping or frictional engagement with the inner side 2b of the winding tube 2. The clamping jaws 28, 34 reach their clamping or operating position when they come with their second end in abutment with that portion of the elliptical cam surface 24 a and 26 a, which has the greatest radial distance from the axis of rotation X. Then the chuck 6 is in its complete clamping state. The usable angle to spend the clamping jaws 28, 34 between their relaxed position or rest position according to Figure 2 and their clamping or working position is 90 ° in this embodiment.

However, the complete clamping state is not shown in FIGS. 3a and 3b. Rather, Figure 3a and b shows a rotational position of the rotary body 14 with its curve segments 24, 26 shortly before completion of the 90 ° pivoting movement and thus shortly before reaching the complete clamping state, as can be seen in particular Figure 3b.

The clamping head 6 described above can be used as a so-called mechanically expanding clamping head. A mechanically expanding clamping head uses the braking torque transmitted by the braking devices 12 (FIG. 1) to the winding tube 2 in order to expand. By "expanding" is meant the outward radial movement of the clamping jaws 28, 34 as previously described, and as the sheet material is withdrawn from the roll 4, the roll 4 begins to rotate To keep the material web under tension, which is often required for a subsequent processing process, a braking torque is to be transmitted via the rotary shafts 8 and the clamping heads 6 to the sealing sleeve 2 and thus the roller 4 by the braking devices 12 (see FIG. In this case, the rotary body 14 is rotated relative to the arrangement of the clamping jaws 28, 34, and according to the principle of a wedge are pressed by the elliptic curve segments 24, 26, the clamping jaws 28, 34 to the outside and ensure a frictional connection and partially positive connection with the inside 2b the winding tube 2, as previously explained. In this case, the expansion force acting in the radial direction (holding force) is inversely proportional to the clamping path, which corresponds to the radial stroke of the clamping jaws 28, 34. In this context, the following relationship applies in a simplified manner:

Expansion force - angle of rotation x braking torque / stroke.

For a chuck, both a sufficient clamping distance and a high expansion force are decisive for its function. This condition corresponds to the previously described chuck 6.

FIG. 5 shows a second embodiment, which differs from the first embodiment according to FIGS. 2 and 3 in that the ellipse, which forms the shape of the cam surface encircling the circumference of the curve segments, does not lie on the axis of rotation X, but off-center of it lies. Another difference from the first embodiment is that not two diametrically opposed clamping jaws is assigned to a curve segment or a group of curve segments, but only one clamping element is assigned to a curve segment or a group of curve segments. Finally, there is a further difference compared to the first embodiment in that three curve segments 124, 125, 126 or three groups of corresponding curve segments lying next to one another in the axial direction are provided in equidistant arrangement, in which case the angular offset is not 90 °, but instead 120 °. Accordingly, only three clamping jaws 128, 129 and 134 are provided in mutually equidistant arrangement, of which the first clamping jaw 128 bears against the first curved segment 124, the second clamping jaw 129 abuts against the second curved segment 125 and the third clamping jaw 134 in abutment with the third cam segment 126.

As further seen in Figure 5, in contrast to Figure 3b reveals the second embodiment is shown in the complete clamping state in which the clamping jaws 128, 129, 134 that portion of the elliptical circumference of the cam segments 124, 125, 126 is applied, which is the maximum distance to Has rotational axis X. The usable angle in order to pass the clamping jaws 128, 129, 134 between their clamping or working position and their relaxed position or rest position is 180 ° in the second embodiment according to FIG. For the rotary body 14 must be rotated by 180 ° relative to the rotational position shown in Figure 5, until the clamping jaws 128, 129, 134 reach the circumference of the associated cam segment 124, 125 and 126 that portion which has the smallest radial distance from the axis of rotation X. , Finally, it should be noted at this point that means can be provided which bias the clamping jaws in the direction of the rotary body 14, so that the clamping jaws are always with its second end in contact with the cam surface of the associated cam segment. However, these means are not shown in the figures.

Claims

claims

1. A device for one-sided recording and for releasably holding a winding tube (2) of a roller (4) of sheet material, in particular an inner sleeve of a paper roll or the like., On a driven shaft end of a rotary shaft (8) of a processing machine, with a at the shaft end and rotatable about a first axis of rotation (X) rotatable base body (14) having at least one curve segment (24, 26) with a cam guide (24a, 26a) which in an angular, preferably approximately at right angles, to the first axis of rotation (X ) with at least one clamping element (28, 34), on the one hand in sliding engagement with the cam guide (24a, 26a) of the at least one cam segment (24, 26) and on the other hand in contact with an inner side (2b) of the angular sleeve (2) can be brought, wherein the base body (14) and the at least one clamping element (28, 34) about a second axis of rotation against each other are rotatable, characterized in that the umlau fende curve guide (24a, 26a) of the at least one curve segment (24, 26) is curved over its entire length and has a varying over its entire length distance to the second axis of rotation.

2. Apparatus according to claim 1, characterized in that the base body (14) has a stop (22) whose radial extent with respect to the first axis of rotation (X) greater than the circle diameter of the at least one clamping element (28, 34) or larger as the inner diameter of the angle sleeve (2).

3. A device according to claim 2, characterized in that the stop (22) with the base body (14) is integrally connected.

4. Apparatus according to claim 2 or 3, characterized in that the stop (22) is formed at least partially annular.

5. The device according to at least one of the preceding claims, wherein the circumferential cam guide is a circumferential cam surface (24a, 26a) which is formed by the circumference of the cam segment (24, 26), and the at least one Spannele- ment (28, 34) with a surface portion (28b, 34b) on the cam surface (24a, 26a) is applied, characterized in that this surface portion (28b, 34b) of the clamping element

(28, 34) forms an approximately flat surface.

6. Apparatus according to claim 5, characterized in that the flat surface (28 b, 34 b) approximately at right angles to the in

With respect to the axis of rotation radial direction is oriented.

7. Device according to at least one of the preceding claims, characterized in that the second axis of rotation coincides with the first axis of rotation (X).

8. The device according to at least one of claims 1 to 6, characterized in that the second axis of rotation extends at a distance approximately parallel to the first axis of rotation (X).

9. Device according to at least one of the preceding claims, characterized in that the at least one curve segment (24, 26; 124, 125, 126) has at least one axis of symmetry which extends transversely to the second axis of rotation.

10. The device according to claim 9, characterized in that the at least one curve segment (124, 125, 126) has a single axis of symmetry which extends transversely to the second axis of rotation.

11. The device according to claim 9, characterized in that the at least one curve segment (24, 26) has two axes of symmetry which extend at right angles to each other and at right angles to the second axis of rotation.

12. The device according to at least one of the preceding claims, characterized in that at least one curve segment (124, 125, 126) is associated with a single clamping element (128, 129, 134) of the cam guide.

13. Device according to at least one of the preceding claims, characterized in that in at least one cam segment (24, 26) at least two clamping elements (28, 34) of the cam guide (24a, 26a) are assigned.

14. The apparatus according to claim 13, characterized in that the angular distances between two adjacent clamping elements (28, 34) are approximately equal.

15. Device according to claims 13 and 14, characterized in that at least one cam segment (24; 26) of the cam guide (24a; 26a) is associated with two clamping elements (28; 34) which are offset from each other by approximately 180 ° are.

16. Device according to at least one of the preceding claims, wherein the base body at least two cam segments (24; 26) which are arranged in the direction of the first axis of rotation (X) side by side or spaced from each other, characterized in that at least one curve segment (24) offset at an angle relative to at least one further curve segment (26) is aligned.

17. The apparatus of claim 16, further comprising at least a first group of cam segments (24) and a second group of cam segments (26), wherein in each

Said cam guides (24a, 26a) have the same orientation with respect to the first axis of rotation (X), characterized in that the first group of cam segments (24) is offset at an angle to the second group of cam segments (26).

18. The apparatus of claim 16 or 17, characterized in that the angle is about 90 °.

19. Device according to claims 15, 16 and 18, with two cam segments (24, 26), characterized by four clamping elements (28, 34), wherein the cam guide (24 a, 26 a) of each cam segment (24, 26) has two clamping elements (28 34) which are approximately diametrically opposite with respect to the second axis of rotation.

20. Device according to claims 15, 16 and 18, with two groups of cam segments (24, 26), characterized in that the cam guide (24a; 26a) in each case one group of cam segments (24; 26) two with respect to the second Rotary axis approximately diametrically opposed clamping elements (28, 34) are assigned.

21. The apparatus of claim 16 or 17, characterized in that the angle is about 120 °.

22. Device according to claims 16 and 21, with three cam segments (124, 125, 126), characterized by three offset with respect to the second axis of rotation about 120 ° to each other arranged clamping elements (128, 129, 134), of which a clamping element (128, 129, 134) is associated with the cam guide of a cam segment (124, 125, 126).

23. Device according to claims 17 and 21, with three groups of cam segments (124, 125, 126), characterized by three offset with respect to the second axis of rotation about 120 ° to each other arranged clamping elements (128, 129, 134), of which a clamping element of the cam guide is assigned to a group of curve segments.

24. Device according to at least one of the preceding claims, characterized in that the base body (14) is provided as with the rotary shaft (8) integrally connected part.

25. The device according to at least one of the preceding claims, characterized in that the circumferential cam guide (24a, 26a) of the at least one cam segment (24, 26) has the shape of an ellipse.

26. Processing machine for web-shaped material, in particular paper, from a wound on a winding tube (2) roller (4) of the sheet material, with at least one device (6) for releasably holding the winding tube (2) according to at least one of the preceding claims and at least one rotatably mounted rotary shaft (8), with which the base body (14) of said device can be coupled.

27. Machine according to claim 26, characterized in that the base body (14) at a shaft end of the rotary shaft

(8) fixed and coaxially aligned with this.

28. A machine according to claim 26 or 27, comprising a drive device for rotatably driving the shaft end of the rotary shaft.

29. Machine according to at least one of claims 26 to 28, with a on the rotary shaft (8) acting braking device (12).

30. Machine according to at least one of claims 26 to 29, comprising two devices (6) for releasably holding the winding tube (2) according to at least one of claims 1 to 18 and with two coaxially aligned and spaced rotary shafts (8), wherein the a rotary shaft (8) the one device (6) for releasably holding one end (2a) of the winding tube (2) and the other rotating shaft (8) the other device (6) for releasably supporting the other end (2a) of the winding tube (2) 2) is assigned.