Sleeve for winding a windable material, and winding shaft for receiving a sleeve

Abstract

The invention describes a sleeve (100) for winding a windable material within a winding machine to form a coil, which sleeve (100) comprises a one-piece workpiece which describes a cylinder and which comprises two edge regions with a respective edge (102, 103), wherein the edge regions overlap one another in an overlapping region, wherein the sleeve (100) can be brought from a relaxed state with a first inside diameter into a tensioned state with a second inside diameter, and vice versa, and wherein the first inside diameter differs from the second inside diameter. At least one holding element (106) for holding the sleeve (100) on a mandrel (201) of the winding machine is provided, wherein the holding element (106) is fixedly arranged on the workpiece in a fastening region (107) and is in particular non-releasably connected to the workpiece.

Description

[0001] Sleeve for winding a winding material and winding shaft for holding a

[0002] sleeve

[0003] The invention relates to a sleeve for winding a winding material according to the preamble of patent claim 1 and to a winding shaft for receiving a sleeve according to the preamble of claim 11.

[0004] WO 2019 / 224370 A1 already discloses a generic winding core for winding a winding material within a winding machine. This core comprises a one-piece workpiece circumscribing a cylinder, wherein the workpiece comprises two edge regions, each with an edge, wherein the edge regions overlap. The workpiece is elastically deformable, so that the core can be brought from a relaxed state with a first inner diameter to a tensioned state with a second inner diameter and vice versa. In the process, the edge regions shift relative to one another. The first inner diameter differs from the second inner diameter, wherein in particular the first inner diameter is smaller than the second inner diameter. This makes it possible to bring the core from the first to the second inner diameter using tensioning elements integrated into a winding shaft onto which the core is pushed, and then to wind the winding material into a coil.The core can then be returned to its original inner diameter and the reel can be removed. This creates a reel without a core, so there are no costs for a core, which is often a disposable core. The aforementioned WO 2019 / 224370 A1 also discloses ways in which the core can be attached to a winding shaft. Accordingly, the core can be held clamped to the shaft. A disadvantage, however, is that when the reel is removed from the core, the core is occasionally also removed from the shaft. This system has therefore proven to be unreliable. The second possibility is that the core has holes through which pins held in the shaft engage. However, the edges of these openings are not sufficient to absorb the axial and circumferential forces acting on it. The edges therefore quickly become damaged.

[0005] The object of the present invention is therefore to propose a sleeve and a winding shaft in which the connection between the sleeve and the winding shaft is reliable and has a long service life without damage.

[0006] According to the invention, this object is achieved by all features of claim 1. Possible embodiments of the invention are specified in the dependent claims.

[0007] According to the present invention, at least one holding element is provided for holding the sleeve on a mandrel of the winding machine, wherein the holding element is fixedly arranged in a fastening region on the workpiece and in particular is non-detachably connected to the workpiece.

[0008] Accordingly, in addition to the actual workpiece, which serves to hold the winding material, the sleeve comprises an additional holding element, wherein this holding element is a separate component and is permanently connected to the workpiece in the fastening area. The holding element is connected to the workpiece during production of the sleeve. In particular, this makes it possible to connect a stable holding element to the workpiece, wherein the connection is preferably flat. Such a holding element can create a more durable connection between the workpiece and the winding shaft. In particular, the sleeve is only connected to the winding shaft via the holding element. In particular, the sleeve is only connected to the winding shaft in a rotationally and axially immovable manner via the holding element when the latter is connected to the winding shaft.

[0009] In one embodiment of the invention, it is provided that at least one continuation region of the holding element extends beyond an axial end of the workpiece in the axial direction. The axial direction is a direction parallel to the main axis of inertia of the sleeve or of the reel wound on the sleeve. The holding element thus has a free region via which the holding element and thus the sleeve can be connected to the winding shaft. The fastening region in which the holding element is connected to the winding shaft thus borders on the workpiece of the sleeve; the workpiece itself only has contact with the winding shaft via the clamping elements of the winding shaft or via the outer surface of the shaft, whereby this contact does not create a rotationally fixed connection or axial immobility.The continuation region may comprise individual plates which may have an increased thickness compared to the thickness of the workpiece material in order to provide the stability necessary for the connection to the shaft.

[0010] It is advantageous if the retaining element is designed as a ring with an interrupted section. A ring-shaped retaining element ensures the largest possible connection to the workpiece. The interrupted section of the ring allows the retaining element, together with the sleeve, to be adjusted essentially from the inner diameter to the outer diameter. This allows the retaining element to follow the sleeve's movements, preventing any unusual mechanical stresses between the sleeve and the retaining element.

[0011] It is advantageous if the overlap area of ​​the workpiece is located at least partially within the gap in the ring. This particularly refers to the area of ​​the workpiece that lies within the fastening area. This measure further reduces the mechanical stresses between the sleeve or workpiece and the retaining element.

[0012] Furthermore, it is advantageous if the holding element comprises through-holes, in particular through-bores, in the fastening area. In particular, it is provided that parts of the workpiece extend through the through-holes. This enables a particularly stable and permanent connection between the workpiece and the holding element.

[0013] In a preferred embodiment of the invention, the workpiece comprises carbon fiber-reinforced plastics with at least two layers, wherein the fastening region is arranged between the two layers. The workpiece will therefore consist of two layers, which comprise, for example, carbon fiber mats, and be inserted between the regions of the holding element. After the holding element has been inserted, the workpiece is coated with a resin, which then cures, preferably during a heat treatment, thereby creating a stable connection between the holding element and the workpiece. The overlapping region of the workpiece preferably exists only in the outer layer, so that the overlapping region causes only the smallest possible thickening.

[0014] It is particularly advantageous if the workpiece comprises carbon fiber-reinforced plastics, with the plastics extending through the through-holes in the fastening area. The plastic, in particular the resin, can thus also pass through the optional through-holes of the holding element before curing, so that after curing, an even more stable connection is created between the holding element and the workpiece.

[0015] It is particularly advantageous if radially extending pins are provided on the extension area of ​​the retaining element. This makes it particularly easy to create a particularly strong connection between the sleeve and the winding shaft, ensuring immovability in both the axial and circumferential directions.

[0016] In particular, the pins are evenly distributed around the circumference. This allows the transmission of the holding forces required to attach the sleeve to the winding shaft to be distributed evenly across the circumference of the sleeve.

[0017] In an advantageous embodiment of the invention, the holding element is made at least partially of a metal, in particular of steel. Spring steel is particularly preferred in this case. On the one hand, such a material provides the elasticity necessary for diameter changes. On the other hand, this choice of material ensures high stability. In particular, it makes it possible to select a small wall thickness of the metal with high strength. This can reduce the thickening of the workpiece in the fastening area. The thickness of the holding element in the fastening area is preferably a maximum of 5 mm, more preferably a maximum of 3 mm, and in particular a maximum of 1 mm.

[0018] The above-mentioned object is further achieved by a winding shaft for receiving a sleeve according to the invention, comprising a cylindrical shaft mandrel and a fastening element with which the holding element of the sleeve can be held immovably relative to the shaft mandrel at least in the axial direction.

[0019] This ensures that the sleeve remains in its axial position even when the winding is removed. In particular, it also ensures that the sleeve's mounting on the shaft dome is not subject to excessive wear and is therefore more durable.

[0020] In an advantageous embodiment, the fastening element is rotatably, axially immovably, and detachably connected to the shaft mandrel. A detachable connection can be created by screwing the fastening element to the shaft mandrel, for example. The shaft mandrel can comprise a flange to which the fastening element can be fastened, for example, by screwing. In particular, the shaft mandrel can comprise several positions, each of which can accommodate a fastening element. This makes it possible to fasten several cores to a winding mandrel or to optimally position a single core on the winding mandrel depending on the width of the winding material.

[0021] It is also advantageous if the fastening element comprises radially extending recesses on its inner surface, which faces the outer circumference of the shaft dome, for receiving the pins of the sleeve. The recesses can thus at least partially enclose the pins of the retaining element, so that at least some of the pins rest at least partially against the walls of the recesses.

[0022] In particular, it is provided that a single recess is dimensioned such that the pin received in this recess can be held essentially immobile within the recess. This allows for optimal force transmission by ensuring that a single pin, which can be reinforced compared to the other pins, for example, due to a larger diameter, assumes a significant portion of the force transmission.

[0023] Furthermore, it is provided that all further recesses in the circumferential direction of the shaft mandrel have a greater extent than the respective pin that is accommodated in the respective recess. This provides a small displaceability for the pins in the circumferential direction when the sleeve is brought in its diameter from the first inner diameter to the second inner diameter or vice versa. In particular, in this case it is provided that these pins also rest at least partially on the walls of the fastening element when the sleeve is in its tensioned state and contribute to the force transmission. The object is additionally achieved by a winding machine for winding a winding material, in particular a web-shaped winding material, onto a sleeve that can be held for winding on a winding mandrel, wherein the sleeve is designed according to and / or the winding mandrel is designed according to one of the embodiments described above.This achieves the same advantages that have already been described above in connection with the sleeve according to the invention and with the winding shaft according to the invention.

[0024] Further advantages, features, and details of the invention will become apparent from the following description, in which various exemplary embodiments are explained in detail with reference to the figures. The features mentioned in the claims and in the description may be essential to the invention individually or in any combination of mentioned features. Throughout the disclosure, features and details described in connection with the sleeve according to the invention also apply in connection with the winding shaft according to the invention, and vice versa. The same applies to the winding machine according to the invention, so that with regard to the disclosure, reference is always made to the individual aspects of the invention. The individual figures show:

[0025] Fig. 1 Perspective view of a sleeve according to the invention

[0026] Fig. 2 Perspective view of a winding shaft according to the invention

[0027] Fig. 3 Section through a fastening element of the winding shaft and a holding element of the sleeve

[0028] Fig. 4 As Figure 3, but with the sleeve in tensioned state.

[0029] Figure 1 shows a perspective view of a sleeve 100. This comprises a workpiece with an outer layer 101, which is preferably made of a carbon fiber reinforced plastic (CFRP). Its edges 102 and 103 overlap one another, allowing them to be displaced relative to one another when the sleeve is subjected to a radially outward force from the inside. This results in the sleeve, and in particular the outer layer 101 of the workpiece, having a second inner diameter that is larger than the first inner diameter that the layer 101 assumes when said force is not applied.

[0030] Furthermore, the workpiece comprises an inner layer 104, which, however, preferably does not have an overlap, but rather an interruption 105 running in the axial direction A, the width of which is selected such that, when the sleeve is not subjected to the force, the edges of the inner layer 104 just do not touch.

[0031] A retaining element designed as a ring 106 is inserted between the inner layer 104 and the outer layer 101. This retaining element essentially occupies the fastening area 107 extending between the front edge 108 of the workpiece and the broken line 109. The ring 106 also has an interruption 110 to allow, similar to the inner layer, changes in the inner diameter to be tracked. The ring is firmly incorporated between the inner layer 104 and the outer layer and cannot be moved or removed without causing damage.

[0032] In the area 111, which extends beyond the fastening area in direction A, there may be at least one further intermediate layer, which is not visible.

[0033] Extending beyond the front edge 108 of the workpiece are several plates 112, in the illustrated case five, which are preferably formed integrally with the ring 106. Each plate 112 carries a radially outwardly extending pin 113. These pins 113 are firmly connected to the plates, preferably welded, to ensure the greatest possible force transmission.

[0034] Figure 2 now shows a winding shaft 200 according to the invention, which is suitable for receiving a sleeve 100 according to the invention. This winding shaft 200 comprises a shaft dome 201, on which a flange 202 is fixedly arranged, i.e., immovable and non-rotatable relative to the shaft dome. Furthermore, a fastening element 203 is provided, which can be releasably connected to the flange 202, for example, by means of screws 204. The fastening element 203 can, as shown, be designed in a stepped manner, with the connecting step 205 serving to connect to the flange 202, whereas the receiving step 206 receives the pins 113 of the holding element. Finally, the fastening element also comprises a holding step 207.

[0035] To attach the sleeve 100 to the winding shaft, the sleeve is first pushed onto the shaft mandrel 201 in the opposite direction to direction A. The fastening element 203 is then pushed over the sleeve 100 in the same direction until the fastening element 203 rests against the flange 202. The two are now connected. The pins come into contact with the flange 202 and the retaining step 207, preventing movement of the sleeve 100 in or against the axial direction A.

[0036] The connecting step 205 comprises a further connecting ring 301, which is shown in Figure 3. The connecting ring 301 is a fixed, i.e. immovable, component of the fastening element 203. When the fastening element 203 has been pushed over the sleeve 100, the pins 113 are located in recesses 302 and 303 of the connecting ring 301. The recesses 303 have a greater extent in the circumferential direction R than the recess 302, the extent of which in the circumferential direction is selected such that it can accommodate the respective pin 113, in particular with minimal play. This prevents rotation of the sleeve in the circumferential direction of the winding shaft. Preferably, the fastening element is positioned relative to the sleeve 100 such that the recess 302 lies opposite the interruption 110 of the ring 106. As a result, the sleeve expands essentially symmetrically when it is transferred to the tensioned state.

[0037] The recesses 303, on the other hand, have a greater extent to allow radial displacement of the pins 113. In the relaxed state, which is shown in Figure 3, the pins are positioned close to the first walls of the recesses. Figure 4 shows the situation in which the sleeve has been brought into the tensioned state. Since the individual elements correspond to those in Figure 3, the reference numerals have been omitted for the sake of clarity. It can be seen that the interruption 110 has increased in size and that the pins 113 have shifted within the recesses 303 and are now positioned close to the second wall, which is opposite the first wall. Due to the preferred symmetrical arrangement, the pins to the left of the interruption and to the right of the interruption also shift symmetrically with respect to the axis of symmetry, which runs from the interruption to the pin in the recess 302.This means that regardless of the direction of rotation of the winding shaft, the sleeve cannot move in the circumferential direction relative to the winding shaft.

[0038]

Claims

Patent claims Sleeve for winding a winding material within a winding machine to form a roll, which comprises a one-piece workpiece which circumscribes a cylinder and which comprises two edge regions, each with an edge, wherein the edge regions overlap in an overlap region, wherein the sleeve can be brought from a relaxed state with a first inner diameter into a tensioned state with a second inner diameter and vice versa, wherein the first inner diameter differs from the second inner diameter, characterized by at least one holding element for holding the sleeve on a mandrel of the winding machine, wherein the holding element is fixedly arranged in a fastening region on the workpiece and in particular is non-detachably connected to the workpiece. Sleeve according to claim 1, characterized in that at least one continuation region of the holding element extends beyond an axial end of the workpiece in the axial direction.Sleeve according to one of the preceding claims, characterized in that. the holding element is designed as a ring comprising an interruption. Sleeve according to one of the preceding claims, characterized in that the overlap region of the workpiece is arranged at least partially within the interruption of the ring. Sleeve according to one of the preceding claims, characterized in that the holding element comprises through-openings, in particular through-bores, in the fastening region. Sleeve according to one of the preceding claims, characterized in that the workpiece comprises carbon-fiber-reinforced plastics with at least two layers, wherein the fastening region is arranged between the two layers. Sleeve according to one of the preceding claims, characterized in that the workpiece comprises carbon-fiber-reinforced plastics, wherein the plastics extend through through-openings of the fastening region.Sleeve according to one of the preceding claims, characterized in that radially extending pins are provided on the extension region of the retaining element. Sleeve according to the preceding claim, characterized in that the pins are evenly distributed over the circumference of the retaining element. Sleeve according to one of the preceding claims, characterized in that The holding element is made at least partially of metal, in particular of steel. A winding shaft for receiving a sleeve according to one of claims 1 to 10, comprising a cylindrical shaft boss and a fastening element with which the holding element of the sleeve can be held immovably relative to the shaft boss, at least in the axial direction. A winding shaft according to the preceding claim, characterized in that the fastening element is connected to the shaft boss in a rotationally fixed, axially immovable, and detachable manner. A winding shaft according to one of the two preceding claims, characterized in that the fastening element comprises, on its inner surface facing the outer circumference of the shaft boss, a radially extending recess for receiving the pins of the sleeve.Winding shaft according to one of the three preceding claims, characterized in that an individual recess is dimensioned such that the pin received in this recess can be held essentially immobile within the recess. Winding shaft according to the preceding claim, characterized in that all further recesses in the circumferential direction of the shaft dome have a greater extent than the respective pin received in the respective recess. Winding machine for winding a winding material, in particular a web-shaped winding material, onto a sleeve which is designed for winding on a winding mandrel, characterized in that the sleeve is designed according to one of claims 1 to 10 and / or the winding mandrel is designed according to one of claims 11 to 15.

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