FI101214B - Rolling sleeve mounting head - Google Patents

Description

j 101214

Rolling sleeve mounting head Fastspänningslock för rullningshylsor

The invention relates to a fastening head for winding sleeves as set out in the preamble of claim 1.

Such a fastening head is known from DE 1 574 438 B. It is used for winding web-like products such as paper webs, film webs and the like on winding sleeves and also for unwinding such winding sleeves, the fastening heads being . This known fastening head has a hexagonal fastening head spindle surrounded by segment-shaped clamping pieces. In the radial direction of the clamping pieces, the inner surfaces (contact surfaces) are in surface contact with the six outer surfaces of the spindle of the fastening head when they are in their (unstretched) rest position. In the radial direction of the clamping pieces, the outer surfaces, which are to be placed later in the opening of the winding sleeve, form a circumference in the rest position which is normally smaller than the free dimension of the opening at the end of the winding sleeve. The clamping pieces and the spindle of the fastening head can rotate relative to each other. The tightening pieces can thus be pressed evenly radially outwards along their entire length in the direction of the spindle of the fastening head, so that their outer surfaces are press-fastened to the opening of the winding sleeve by means of compression. As the web continues to roll, the diameter of the roll and thus the displacement torque ·. ment are growing. This automatically leads to a stronger spread of the clamping pieces. However, at the end of the unwinding or unwinding delivery, it is not possible to apply the same opposite torque between the sleeve or the roll and the fastening head as in the (opposite) maximum torque in the unwinding delivery. It is therefore not possible to remove or restore the applicator 101214 2. The fastening head must therefore be pulled out of the winding sleeve in its extended working position with great force.

DE 29 10 114 A1 discloses a fastening end similar to DE 1 574 438 B, the difference being that in the former publication the surfaces inside the radial direction of the clamping pieces are not in surface contact with the outer surfaces of the spindle of the fastening head, but have

a circular cylindrical inner profile with axial grooves, wherein the convexly shaped surfaces of the elongate press-fit presses project radially inwardly and these surfaces are in line contact with the six outer surfaces of the mounting head mandrel. In the case of the latter device, the fastening head can be detached from the pre-rolled sleeve with less force than in DE

1,574,438 B in the case of a known mounting head.

In another fastening head structure, as shown e.g. in DE 28 15 310 C, pulling the winding sleeves from the fastening head is simpler than in the case of fastening heads such as those described in the introduction, because in this second known fastening head structure the fastening head mandrel and clamping pieces are moved axially relative to each other to expand or contract the clamping pieces. The sliding surfaces between the spindle of the fastening head and the clamping pieces are wedge-shaped for this purpose. The axial response connected to the clamping pieces, which, while the clamping pieces are not yet applied, strikes the end surface of the sleeve, allows a force acting in the axial direction to be transmitted, causing the clamping pieces to slide along the axis of the fastening head and then spread into the end of the winding sleeve. For the entire tightening head, the constant expansion distance then depends on the axial thrust. When the fastening head is pulled out of the winding sleeve, the spindle of the fastening head initially retracts relative to the clamping pieces, as a result of which the clamping pieces move radially inwards and the radial compressive force is relaxed. In the case of this fastening head structure 3 101214, it is therefore simpler to pull the fastening head out of the winding sleeve than in the case of fastening heads of the type mentioned in the introduction. However, this advantage includes e.g. the disadvantage is that the tightening force depends only on the axial force applied to the tightening pieces. If this is too large, the winding sleeve will change shape and if the force is too small, there is a risk of slipping between the winding sleeve and the mounting head as the torque increases. Both are undesirable.

DE 37 00 472 A1 discloses another fastening head of the type described in the preamble, in which the spindle of the fastening head has, in addition to a constant axial tightening zone in a polygonal cross-section, a truncated cone-shaped tightening zone with a circular, inward-grooving direction. The truncated cone-shaped clamping zone is then located in the insertion direction before the clamping zone of constant polygonal cross-section. The purpose of the two successively arranged clamping zones is that, when the force acting axially on the fastening head or the force acting circumferentially on the fastening head is completely relaxed, one of the clamping zones remains active. If it is desired to pull the fastening head out of the pre-rolled sleeve, the relative rotation between the fastening head spindle and the clamping pieces causes the same difficulties as in DE 1 574 438 B, since it is difficult or even impossible to apply a corresponding torque to the rolled sleeve in the opposite direction. The truncated cone-shaped clamping zone then acts as an additional barrier, since the sheath of the truncated cone surface is firmly attached to the respective truncated cone-shaped surfaces of the clamping pieces.

This known geometry of the clamping zones means that the radial clamping distance of the clamping parts, which is at most feasible in a truncated cone-shaped clamping zone, must be exactly equal to the maximum clamping distance obtainable in a polygonal clamping zone of constant cross-section. Only in this way can it be guaranteed that each of the tightening zones can also transmit the tightening forces alone, i.e. without the contribution of the other tightening zone.

The invention is thus based on the object of providing a fastening head of the type described in the introduction, in which the pull-out of the winding sleeve is facilitated in connection with the provision of torque-dependent spreading.

This object is solved by the features set forth in claim 1.

The advantage of the fastening head according to the invention is e.g. , that the radial expansion distance depends on the torque, so that both damage to the winding sleeves and sliding of the winding sleeves are prevented, and that, however, it facilitates the removal of the fastening head from the winding sleeve. The advantages of the two fastening head structures mentioned in the introduction are thus combined without any disadvantages. The fastening head of claim 1 further has the advantage that the relative position in the axial direction between the winding sleeve and the fastening head spindle is always precisely determined, since the expansion distance always consists of a displacement part and a rotation part, the displacement part always always having priority. in the axial direction before the rotation can begin. In the second construction of the fastening heads, on the other hand, the relative position between the clamping pieces (and thus also the winding sleeve) and the spindle of the fastening head is necessarily variable and indeterminate. However, this is usually undesirable.

In order to also make the expansion distance of the clamping pieces in the fastening parts according to the invention the entire effective length, a fastening head according to the features of claim 3 is proposed.

5 101214

If in a particular application it is not so important that the relative position of the fastening head in the direction of the spindle and the axes of the clamps is always the same, but instead it is very important that the expansion distance is constant over the entire effective length of the clamps, a fastening head according to claim 3 is proposed. .

The constant magnitude of the expansion distance with the effective length of the clamping pieces is achieved in a particularly simple manner with the features set out in claim 4.

The features according to claim 5 provide a relatively low frictional resistance between the spindle of the fastening head and the clamping pieces during expansion and contraction. In addition, they provide very precisely defined relative positions between the spindle of the fastening head and the clamping pieces. However, in addition to the rolling movement between the clamping pieces and the spindle of the fastening head, a certain sliding movement may still occur. The rolling movement can be carried out in a particularly simple manner with the features according to claim 6.

Rotational movement between the mounting head spindle and the clamping pieces; In order to achieve automatic recovery of the clamp after pulling the fastening head from the winding sleeve, a fastening head according to the features of claim 7 is proposed. Claims 8 and 9 show practical embodiments of this solution, which can advantageously be used in the fastening heads according to the preamble also regardless of the features of claims 1 and 3.

None of the above-mentioned size, design, material selection or technical implementation of the components to be used according to the invention are specifically excluded, so that the selection criteria known in each application can be used without limitation.

, 101214

Other details, features and advantages of the subject matter of the invention will become apparent from the following description and the accompanying drawings, in which a preferred embodiment of a fastening head according to the invention is shown by way of example. In the drawings: Figures 1a-1c show a fastening head according to the invention in a rest position, i.e. with the clamping pieces fully retracted, Figure 1a showing a longitudinal section of the fastening head (section along line Ia-Ia in Figure Ib), Figure Ib a cross-section of the mounting head of Figure 1a Ib) and Fig. 1a is an end view of the fastening head according to Fig. 1a (Fig. A, i.e. without cover), Fig. 2a the same fastening head after the end of the tightening distance due to axial displacement (section along the line Ha-Ha in Fig. 2b), Figs. 2b and Figures Ib and 1e the mounting-2c head for the operating position shown in Fig. 2a, Figs. 3a-3c corresponding to the same mounting head for Figs. 1a; but in the third operating position (i.e. in the winding position, i.e. with the clamps spread out inside the winding sleeve), Figures 4a-4c show the same mounting head in the fourth operating position, i.e. with the clamping head spindle still rotated relative to the clamps, but already retracted in the axial direction Fig. 5 is a schematic end view of the same mounting head (corresponding to Fig. A) for showing the relative positions 10101414 between the mounting head spindle and the tensioning pieces with respect to each other twisted and untwisted; Fig. 6 shows an alternative embodiment of the mounting head spindle as shown in Fig. 5.

In the figures, the fastening head of the winding sleeves 10, indicated generally by reference numeral 100, consists of a fastening head mandrel 20, a slender part acting as a fastening head housing 30, and clamping pieces 40.

As shown in Figures 1a / b, the winding sleeves 10 shown in the figures consist of circular cylindrical tubes with ends 11 and an concentric opening 12 open at the end side into which the fastening head 100 can be inserted axially. Although tubular winding sleeves are the most common, it is in principle possible to use closed circular cylindrical bodies with corresponding openings at the ends as winding sleeves.

The mounting head spindle 20 is formed as a hexagonal truncated pyramid, the base 21 of which is fixed to the plate 22. The plate 22 or the fixing head spindle 20 itself is rotatably mounted on the support arm in a manner known per se and can be rotated about the axis direction B. The spindle of the mounting head is formed as a camshaft, i.e. it is mounted on one side. The mounting head housing 30 is rotatably mounted relative to the mandrel base 21 and the free end 23. In addition, a return device 50, which will be explained later, is attached to the free end of the mandrel.

The six clamping surfaces 24 of the mounting head spindle 20 are slightly inclined with respect to the axis direction B and rectilinear in the dimension direction corresponding to the axis direction. In contrast, in the circumferential direction C of the fastening head (see Fig. 1e and Fig. 5), the clamping surfaces 24 are concave, this concavity being strongest at the narrow end of the truncated pyramid (free end 101214 8 at end 23) and decreasing continuously to zero towards the bottom 21. This is particularly evident in Figure 5.

The six circumferentially evenly distributed clamping pieces 40 consist of clamping pieces 41 and sliding pieces 42, which are connected to each other in a manner known per se. Through the opening 43 of each clamping piece 40, circumferentially, springs 44 are placed, which (as shown in Fig. Ib) are made as open rings and which act as return springs acting in the constrictive direction. As shown in Figure 1a, the sliders 42 are axially rectilinear and, as shown in Figures 5 and 6, made convex in the transverse direction (circumferential direction C) so that their contact surfaces 45 on which they abut the corresponding clamping surface 24 of the mounting head spindle 20 are circular cylindrical. . The contact between the clamping pieces and the spindle of the fastening head thus takes place along the line of contact 46 (see Figures 5 and 6), regardless of the magnitude of the angle of rotation between the spindle of the fastening head and the clamping pieces,

The mounting end housing 30 has a cylindrical sliding surface 31 at the bottom end of the mandrel and a cylindrical sliding surface 32 at the free end side of the mounting head. 20 with respect to a second end stop 35 cooperating with the plate 22 (see Figure 2a). The mounting head housing 30 is provided with elongate openings 36 inside which the clamping pieces 40 are arranged in a radius. parallel. The end stops 37 limit the maximum possible expansion distance of the clamping pieces 40.

The return device 50 is inside a conically tapered cover 51 which is non-rotatably connected to the mounting head housing 30, e.g. by screws not shown in the drawing. Inside the cover 50 there is an annular or annular segment-shaped groove 52 with two helical springs 53, fixed to the cover 9 101214, i.e. also a fixed stop 54 with respect to the housing, and a circular ring-shaped gripper 55. The gripper 55 is attached to it by a non-rotatable arm 56 to the free end of the spindle 20 of the mounting head. The gripper 55 and the arm 56 are shaped so that they can rotate together inside the cover 51 and with respect to the mounting head housing 30 against the restoring effect of the springs 53. The springs 53 hold the mounting head housing 30 and the mounting head mandrel 20 in a mutually neutral rotational position as long as the mounting head is outside the winding sleeve or when the mounting head mandrel and the mounting head housing have not yet been rotated relative to each other, as in the operating positions of Figures 1 and 2. After rotation, one of the springs 53 is tensioned and the other spring 53 is untensioned or tensioned in the opposite direction. This is evident from Figures 3c and 4c. In this case, the energy stored in the compressed or extended spring is only released when the winding sleeve is pulled out of the mounting head.

Comparing Figures 1a and 2a, it can be seen that the maximum possible displacement between the mounting head mandrel 20 and the mounting head housing 30 in the axial direction B is relatively small and limited by the gripper arm 56 on the inner surface 57 of the cover 51 and the end surface 38 of the mounting head housing 30. with only a slight taper, this results in a relatively small expansion distance due to the displacement of the tension members 40. This is clear from the comparison between Figures 1a and 2a. In general, it is not necessary (although possible) that the tightening pieces-. the radially outwardly pressing surfaces 47 of the rolls 40 would be pressed against the inner wall surfaces of the winding sleeve 10 when the expansion distance due to the displacement of the tightening members has been traveled in its entirety (see Fig. 2a). In this operating position, it is sufficient to form a first, still relatively weak frictional connection between the winding sleeve 10 and the fastening head 100, so that the housing and clamps of the fastening head ίο 101214 and the fastening head spindle can rotate relative to each other when rotating the fastening head against the winding sleeve. In such a rotational movement between the spindle of the fastening head and the clamping pieces, a combined sliding and rolling movement takes place. This is particularly evident from Figures 5 and 6. It spreads the clamping pieces radially outwards and spreads into the opening 12 of the winding sleeve 10 (see Figures 3a to 3c).

When the winding sleeve has to be pulled out of the fastening end again, an axial outward force is applied to the fastening head in a known manner. As a result, the spindle head 20 of the fastening head retracts a small displacement distance from the fastening head housing 30. The expansion distance due to the displacement movement of the clamping pieces is made to be supported by the return springs 44. This relatively small distance of the tightening pieces, which has already ended in the representation according to Figures 4a to 4c, is sufficient to enable the fastening head to be pulled out of the winding sleeve 10 with a relatively small force.

It can be seen from Figures 5 and 6 that the expansion distance of the clamps 40 or the sliders 42 is equal in the axial direction of the clamps at the front and rear ends, because the curvature of the clamping surfaces changes continuously along the length of the spindle of the fastening head. Since the transition between the maximum curvature and the minimum curvature in the spindle of the fastening head takes place gradually, the sliding pieces are attached to the clamping surfaces 24 along their entire length, thus remaining axially parallel in all expansion or contraction positions. The required curvature geometry can be obtained relatively simply mathematically. The same effect can also be obtained when the curvature of the contact surfaces 45 of the sliders 42, in particular the radius of curvature, changes continuously along the length of the clamping piece 40 or when both the spindle of the fastening head and the clamping pieces have different curvatures. However, the geometry shown in Figures 5 and 6 has the advantage of particularly simple controllability.

Claims (10)

A clamping head for rolling sleeves on which web-shaped goods such as paper webs and the like are rolled up and rolled off, respectively, comprising a multi-sided clamping shaft (20) and clamping pieces (40) abutting against the clamping head shaft, the clamping pieces (40) and the clamping head shaft (20) being relatively rotatable the rotation results in a radial movement (expansion / contraction distance) of the clamps, characterized in that the clamping shaft (20) is formed as a truncated pyramid, the clamps (40) and the clamping shaft (20) are displaceable relative to each other (shaft) (40). are provided or functionally connected to a respective end stop (34 and 35) operating for the rolling sleeve (10) on one side and for the tensioning shaft (20) on the other, respectively, and the tensioning stretch (expansion / contraction) of the clamping head (20). distance) is composed of a torsion-dependent part and a displacement-dependent part, thus, that (the second) the end stroke (35) when its axial end position before the end of the tensioning stretch is reached. 2. Tension heads for rolling sleeves, on which web-shaped goods such as paper webs and the like are rolled up and rolled off, respectively; - a multi-sided clamping head shaft (20) and «clamping pieces (40) abutting the clamping head shaft, wherein the clamping pieces (40) and the clamping shaft (20) are rotatable relative to each other and the rotation causes a radial movement (expansion / contraction stretch) of the clamping head piece, (20) is formed as a truncated pyramid, the clamps (40) and the clamping shaft (20) are slidable relative to each other in shaft direction (B), - the clamps (40) are provided or functionally connected to one in the shaft direction (B), respectively. effective end stop (34 and 35) for the rolling sleeve (10) on one side and for the clamping shaft (20) on the other, and - the side surfaces (clamping surfaces 24) of the clamping shaft (20) or clamping pieces (40) abutting these clamping surfaces (45) ) or the bend is curved in the circumferential direction (C) of the clamping head and the volume of the bend changes substantially continuously along the axis direction (B), so that the rotation between the tension head shaft (20) and the tension pieces (40) leads to an equal expansion / contraction distance along the entire length of the tension pieces (40) in the axis direction (B). 3. Tension head according to claim 1, characterized in that the side surfaces (45) or bed (45) of the tension head shaft (20) or the contact surfaces (45) or bed of the tension head (40) are curved in the circumferential direction (C) of the tension head and that the volume of the curvature changes substantially all the time along the axis (B). ), such that rotation between the clamping head shaft (20) and the clamping pieces (40) leads to an equal expansion / contraction distance along the entire length of the clamping pieces (40) in the axis direction (B). Clamping head according to claim 2 or 3, characterized in that the clamping surface (24) is straight formed at the thicker end (base 21) of the clamping shaft (20) and concave curved at the thinner end (free end 23) or convexly curved at the thicker end and straight at the narrower end. Clamping head according to any of claims 1-4, characterized in that the clamping surfaces (24) or clamping parts (40) of the clamping shaft (20) or clamping parts (40) thereof or bed of these surfaces are curved formed in the circumferential direction (C) of the clamping head. say, that mutual contact between the clamping head shaft (20) and the individual clamping pieces (40) is substantially extended and an at least partial rolling movement occurs between the clamping head shaft and the individual clamping pieces. 6. Clamping head according to claim 5, characterized in that the contact surfaces (45) of the clamping pieces (40) are circularly cylindrical. Tension head according to any one of claims 1-6, characterized by at least one spring (53) which is adjustable by rotation between the tension pieces (40) and the tension head shaft (20) for reversing the rotation after the pull of the rolling sleeve (10) from the tension head (100). ). Tightening head according to claim 7, characterized in that said at least one spring (53) is approximately in the circumferential direction (C) of the tensioning head (100) extending coil spring. Clamping head according to claim 7 or 8, characterized in that said at least one spring (53) is supported on one side in a joint with the clamping pieces (40) in relation to the clamping head shaft (20) rotatable and preferably also displaceable housing part. (clamp head cover 30), on a fixed abutment (54) fixed thereon, and on the other hand on a clamp head shaft; - (20) attached carrier (55). Clamping head according to any one of claims 1-9, characterized by a clamping piece (40) preferably received in breakthrough (36), jointly with clamping pieces (40) relative to the clamping head shaft in at least one direction displaceable. casing part (clamp head casing 30). 101214 Viitenumeroluettelo 10 rolllaushylsy 57 sisäpinta 11 pääty 100 kiristyspää 12 aukko 20 kiinnityspään kara A etusivu 21 pohja B akselin suunta 22 levy C kehän suunta 23 vapaa pää 24 kiristyspinta 30 kiinnityspään kotel päätyvasteet 38 päätypinta 40 kiristyskappale 41 puristuskappale 42 1lukukappale 43 aukko 44 jousi 45 kosketuspinta; 46 kosketusviiva 47 puristuspinta (ulkopinta) 50 palautuslaite 51 chance 52 ura 53 kierrejousi 54 fixed 55 tarttuja 56 varsi