Braiding bobbin and braiding device

Abstract

The invention relates to a braiding bobbin for a braiding device. The braiding bobbin includes a cylindrical braiding spool, from which a previously wound, multilayer ribbon can be unwound, wherein a first layer of the ribbon consists of a pre-impregnated fiber film, and a second layer of the ribbon consists of a protective film. In addition, the braiding bobbin includes a bracket to which the braiding spool is frontally and rotatably fastened. Additionally provided for the braiding bobbin is a cylindrical additional spool for winding the protective film of the unwound ribbon and a deflection element. The deflection element is fastened to the bracket, wherein the deflection element is secured spaced apart in the radial direction R to the braiding spool and designed for deflecting the protective film from the braiding spool to the additional spool.

Claims

1. A braiding bobbin for a braiding device, the braiding bobbin comprising: a multilayer ribbon including a first layer of a pre-impregnated fiber film and a second layer of a protective film, a cylindrical braiding spool on which the multilayer ribbon is initially wound, a bracket to which the braiding spool is rotatably fastened, a cylindrical additional spool configured for winding the protective film of the multilayer ribbon when the multilayer ribbon is unwound, and a deflection element fastened to the bracket, wherein the deflection element is secured at a distance in a radial direction to the braiding spool and is configured to deflect the protective film from the braiding spool to the additional spool, wherein rotation of the braiding spool to unwind the multilayer ribbon therefrom causes rotation of the additional spool to wind the protective film thereto.

2. The braiding bobbin according to claim 1, wherein the braiding spool rotates about a braiding spool axis, terminates at a lowermost end, and terminates at an uppermost end distanced from the lowermost end by a height of the braiding spool along the braiding spool axis, wherein a lowermost plane perpendicular to the braiding spool axis includes the lowermost end, wherein an uppermost plane perpendicular to the braiding spool axis includes the uppermost end, and wherein the additional spool is not located between the lowermost plane and the uppermost plane.

3. The braiding bobbin according to claim 1, wherein the braiding spool and additional spool are coaxial.

4. The braiding bobbin according to claim 1, wherein an upper end of the braiding spool is directly joined with a lower end of the additional spool.

5. The braiding bobbin according to claim 1, wherein the braiding spool and additional spool are aligned coaxially about a coaxial axis or with respective axes aligned parallel to each other, and wherein the braiding spool and additional spool are distanced from one another along the coaxial axis or in the axial direction defined by the respective axes.

6. The braiding bobbin according to claim 1, wherein the additional spool is coupled with the braiding spool by at least one driving means, wherein rotating the braiding spool around the accompanying braiding spool rotational axis by means of the at least one driving means to unwind the multilayer ribbon therefrom causes the additional spool to rotate around an accompanying additional spool rotational axis to wind the protective film thereto.

7. The braiding bobbin according to claim 1, wherein: an end of the braiding spool comprises a radially outwardly protruding braiding spool limiting disk, and/or an end of the additional spool comprises a radially outwardly protruding additional spool limiting disk.

8. The braiding bobbin according to claim 7, wherein the deflection element extends in an axial direction from a first deflection element end to a second deflection element end, wherein the first deflection element end is situated radially outside relative to the braiding spool, the second deflection element end is situated radially outside relative to the additional spool, wherein the multilayer ribbon extends in a plane tangential to the braiding spool from the braiding spool to the first deflection element, wherein the protective film extends in a plane parallel the axis of the braiding spool from the first deflection element to the second deflection element, and wherein the protective film extends in a plane tangential to the additional spool from the second deflection element to the additional spool.

9. The braiding bobbin according to claim 8, wherein the deflection element comprises a first guiding element protruding in the radial direction for guiding the protective film.

10. The braiding bobbin according to claim 9, wherein the deflection element comprises a second guiding element protruding in the radial direction for guiding the protective film.

11. The braiding bobbin according to claim 9, wherein the braiding spool rotates about a braiding spool axis, terminates at a lowermost end, and terminates at an uppermost end distanced from the lowermost end by a height of the braiding spool along the braiding spool axis, wherein a lowermost plane perpendicular to the braiding spool axis includes the lowermost end, wherein an uppermost plane perpendicular to the braiding spool axis includes the uppermost end, and wherein the first guiding element is situated between the lowermost plane and the uppermost plane, and wherein the second guiding element is situated such that the uppermost plane is between the second guiding element and the lowermost plane.

12. A braiding bobbin for a braiding device, the braiding bobbin comprising: a cylindrical braiding spool configured to rotate about a braiding spool axis and configured to hold a winding of a multilayer ribbon between a lowermost end and an uppermost end of the braiding spool, wherein the braiding spool axis defines an axial direction; a bracket to which the braiding spool is rotatably fastened; a cylindrical additional spool distanced from the braiding spool in the axial direction and configured to wind up a film layer from the multilayer ribbon when the multilayer ribbon is unwound, wherein the additional spool rotates about the braiding spool axis; and a deflection element fastened to the bracket and positioned at a distance from the braiding spool in a radial direction, wherein the deflection element is configured to deflect the film layer from the braiding spool to the additional spool.

13. The braiding bobbin according to claim 12 wherein the additional spool is directly connected to the braiding spool.

14. The braiding bobbin according to claim 12 wherein: the deflection element extends in an axial direction from a first deflection element end to a second deflection element end; the first deflection element end is situated radially outward from the braiding spool; and the second deflection element end is situated radially outward from the additional spool.

15. A braiding bobbin for a braiding device, the braiding bobbin comprising: a cylindrical braiding spool configured to rotate about a braiding spool axis and configured to hold a winding of a multilayer ribbon; a bracket to which the braiding spool is rotatably fastened; a cylindrical additional spool configured to rotate about the braiding spool axis to wind up a film layer from the multilayer ribbon when the multilayer ribbon is unwound; and a deflection element fastened to the bracket and positioned at a distance from the braiding spool in a radial direction, wherein the deflection element is configured to deflect the film layer from the braiding spool to the additional spool.

16. The braiding bobbin according to claim 15 wherein: the deflection element extends in an axial direction from a first deflection element end to a second deflection element end; the first deflection element end is situated radially outward from the braiding spool; and the second deflection element end is situated radially outward from the additional spool.

17. The braiding bobbin according to claim 15 wherein an upper end of the braiding spool is directly joined with a lower end of the additional spool.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Additional advantageous embodiments of the invention may be gleaned from the description of embodiments according to the invention in conjunction with the claims and/or attached drawings. Embodiments according to the invention may here involve individual features or a combination of several features. The invention will be explained below based on exemplary embodiments with reference to the drawings, without limiting the overall inventive idea. The drawings show:

(2) FIG. 1 depicts an exemplary embodiment of the braiding bobbin according to the invention in a first schematic side view,

(3) FIG. 2 depicts another exemplary embodiment of the braiding bobbin according to the invention in a schematic side view,

(4) FIG. 3 depicts another exemplary embodiment of the braiding bobbin according to the invention in a schematic top view,

(5) FIG. 4 depicts another exemplary embodiment of the braiding bobbin according to the invention in a schematic side view, and

(6) FIG. 5 depicts an exemplary embodiment of the braiding device according to the invention in a schematic perspective view.

DETAILED DESCRIPTION

(7) FIG. 1 shows the braiding bobbin 10 according to the invention in an exemplary embodiment. The braiding bobbin 10 serves as a braiding bobbin 10 for a braiding device 12, as exemplarily shown on FIG. 5.

(8) The braiding bobbin 10 comprises a cylindrical braiding spool 14. A multilayer ribbon 16 may be wound onto the braiding spool 14. In addition, the multilayer ribbon 16 may be unwound from the braiding spool 14. A first layer of the multilayer ribbon 16 is formed by a pre-impregnated fiber film 18. A second layer of the multilayer ribbon 16 is formed by a protective film 20.

(9) The braiding bobbin 10 also comprises a bracket 22. The braiding spool 14 is frontally and rotatably fastened to the bracket 22.

(10) In addition, the braiding bobbin 10 comprises a cylindrical additional spool 24 for winding the protective film 20. Therefore, the additional spool 24 is used to wind the protective film 20 of the unwound ribbon 16.

(11) In addition, the braiding bobbin 10 comprises a deflection element 26, wherein the deflection element 26 is fastened to the bracket 22. The deflection element 26 is fastened spaced apart relative to the braiding spool 14 in the radial direction R, e.g., as shown on FIG. 2. In addition, the deflection element 26 is designed to deflect the protective film 20 from the braiding spool 14 to the additional spool 24.

(12) As may be gleaned from FIG. 1, the bracket 22 may be designed as a base plate and/or base element. A bearing may be provided between the bracket 22 and braiding spool 14 in order to rotatably fasten the braiding spool 14 to the bracket 22. As a consequence, the braiding spool 14 may perform a rotation around an accompanying braiding spool rotational axis F relative to the bracket 22.

(13) The braiding spool 14 is preferably designed symmetrically to the braiding spool rotational axis F. Therefore, the braiding spool 14 may be designed as a cylindrical body, in particular as a circularly cylindrical body. However, the term cylindrical is not to be limited to a circularly cylindrical design of the braiding spool 14. Rather, the braiding spool 14 may comprise an annular cross sectional configuration.

(14) The multilayer ribbon 16 may be wound onto the braiding spool 14. The multilayer ribbon 16 may comprise an upper layer and a lower layer, wherein one of the two layers may be the pre-impregnated fiber film 18, and the other layer may be the protective film 20. Additional layers may be provided for the multilayer ribbon 16.

(15) If a tensile force acts on an outer end of the ribbon 16, the latter may be unwound from the braiding spool 14. The tensile force here preferably acts on the pre-impregnated fiber film 18. The tensile force is caused by the braiding device 12 shown on FIG. 5, wherein the pre-impregnated fiber film 18 is braided onto the mandrel to be braided 28.

(16) The tensile force acting on the pre-impregnated fiber film 18 causes the multilayer fiber ribbon 16 to unwind, so that the protective film 20 is also unwound. The pre-impregnated fiber film 18 unwound from the braiding spool 14 is guided to the mandrel 28, so as to there braid the mandrel 28, with the protective film 20 not being used to braid the mandrel 28. The purpose of the protective film 20 is to ensure that the windings of the pre-impregnated fiber film 18, if still wound onto the braiding spool 14 with the multilayer ribbon 16, only come into contact with each other slightly, or not at all. This is because the pre-impregnated fiber film 18 preferably has a sticky surface. Therefore, the protective film 20 is used to prevent the windings of the pre-impregnated fiber film 18, if situated on the braiding spool 14 as the result of the wound ribbon 16, from sticking together. The protective film 20 is preferably formed of a thin layer film. The protective film 20 is further preferably made out of plastic. In addition, the protective film 20 comprises such a low surface roughness that the fiber film 18 may be separated and/or peeled from the protective film 20 in essentially a nondestructive manner.

(17) As already mentioned, the protective film 20 is not used to braid the mandrel 28. In order to keep the protective film 20 from inadvertently getting in direct proximity to the mandrel 28, and to further keep the protective film 20 from inadvertently also being braided onto the mandrel, the braiding bobbin 10 comprises a cylindrical additional spool 24. The additional spool 24 is used to wind the protective film 20, here specifically as the portion of the multilayer ribbon 16 that is unwound.

(18) As may be gleaned from FIG. 1 and FIG. 2, it is preferably provided that the braiding spool 14 and additional spool 24 be arranged one behind the other in an axial direction A of the braiding spool 14. In this way, the braiding spool 14 and additional spool 24 may be aligned coaxially relative to each other. They may thus comprise a shared axial alignment. The braiding spool rotational axis F of the braiding spool 14 and an additional spool rotational axis Z of the additional spool 24 are especially preferably aligned coaxially relative to each other.

(19) If the multilayer ribbon 16 is unwound in response to the tensile force acting on the pre-impregnated fiber film 18, the protective film 20 also thereby unwound is deflected toward the additional spool 24 by means of the deflection element 26. One end of the deflection element 26 is fastened to the bracket 22. The deflection element 26 is preferably designed as a rod-shaped body. The deflection element 26 is spaced apart in the radial direction R from the braiding spool 14 and/or additional spool 24. In addition, the deflection element 26 extends in axial direction A from the bracket 22 up to an area parallel to the additional spool 24. During deflection, the protective film 20 is directed from the braiding spool 14 to the additional spool 24 over an area of the deflection element 26 facing away from the braiding spool 14 and/or additional spool 24.

(20) The unwound protective film 20 that was deflected by the deflection element 26 is wound by the additional spool 24. To this end, it is preferably provided that the additional spool 24 be coupled to the braiding spool 14 in such a way that a rotation by the braiding spool 14 around the accompanying braiding spool rotational axis F triggers a rotation by the additional spool 24 around the accompanying additional spool rotational axis Z. For example, if the braiding spool 14 rotates clockwise around the accompanying braiding spool rotational axis F, as schematically denoted on FIG. 1 by the rotation arrow below the bracket 22, the additional spool 24 may resultantly also rotate clockwise around the accompanying additional spool rotational axis Z, as denoted by the rotation arrow above the additional spool 24. A rotation by the braiding spool 14 may basically also lead to an opposite rotation by the additional spool 24.

(21) An exemplary coupling of the additional spool 24 to the braiding spool 14 is schematically shown on FIG. 2. For example, coupling may be accomplished by means of a connecting element 30, which extends from a front side 32 of the braiding spool 14 to an oppositely situated front side 34 of the additional spool 24. The at least one connecting element 30 may be used to establish a mechanical coupling between the braiding spool 14 and additional spool 24. If the braiding spool 14 is now made to rotate by the tensile force acting on the fiber film 18, the braiding spool 14 simultaneously drives the additional spool 24. This configuration ensures that the protective film 20 will always be wound up when the multilayer ribbon 16 or pre-impregnated fiber film 18 starts to be unwound.

(22) Another advantageous embodiment of the braiding bobbin 10 is characterized in that the front side 32 of the braiding spool 14 is connected with the front side 34 of the additional spool 24, in particular directly. For example, the front side 32 of the braiding spool 14 may be joined with the front side 34 of the additional spool 24 materially, non-positively (force fit) and/or positively (form fit). It may further be preferred that the braiding spool 14 and additional spool 24 have an integral and/or one-piece design.

(23) FIG. 3 presents a side view along a transverse axis of the braiding bobbin 10. As may be taken therefrom, the protective film 20 is guided by the deflection element 26 while unwinding the multilayer ribbon 16. The fiber film 18 also unwound while unwinding the multilayer ribbon 16 is guided away from the braiding spool 14 by a fiber guiding element 36, in particular partially toward the mandrel. The fiber guiding element 36 is situated radially outside relative to the deflection element 26. The deflection element 26 is also depicted on FIG. 3. The latter also directs the protective film 20 away from the braiding spool 14 while peeling off the multilayer ribbon 16, so as to divert it toward the additional spool 24.

(24) Another embodiment of the braiding bobbin 10 is shown on FIG. 4. The braiding bobbin 10 here comprises a driving means 38. The additional spool 24 is coupled with the braiding spool 14 by means of the at least one driving means 38, which is only schematically shown on FIG. 4, so that a rotation by the braiding spool 14 around the accompanying braiding spool rotational axis F by means of the at least one driving means 38 causes the additional spool 24 to rotate around the accompanying additional spool rotational axis Z. For example, the driving means 38 may be a simple transmission. By means of the transmission the braiding spool 14 may be driven by the additional spool 24. If the braiding spool 14 is made to rotate, the transmission also causes the additional spool 24 to rotate. The rotational directions may correspond to each other or be opposite each other.

(25) Alternatively or additionally, a driving means may be designed as a sliding clutch. The sliding clutch offers the advantage of being able to limit a tensile force on the protective film 20, which may be exerted by the additional spool 24 on the protective film 20. As a result, a tearing of the protective film 20 may be effectively prevented.

(26) The braiding spool 14 may comprise a radially outwardly protruding braiding spool limiting disk 44 on one or all of its front sides 32 or 40. The at least one braiding spool limiting disk 44 may ensure a reliable unwinding of the multilayer ribbon 16 or the fiber film 18 and the protective film 20, respectively.

(27) The additional spool 24 may comprise a radially outwardly protruding additional spool limiting disk 46 on at least one or each of its front faces 34, 42. The at least one frontal additional spool limiting disk 46 may ensure that the protective film 20 is reliably wound onto the additional spool 24.

(28) It may also be provided for the braiding bobbin 10 that the deflection element 26 extend in an axial direction A from a first deflection element end 48 to a second deflection element end 50, wherein the first deflection element 48 is situated radially outside relative to the braiding spool 14 or on the bracket 22, and the second deflection element end 50 is situated radially outside relative to the additional spool 24. It is here possible that the deflection element 26 not extend over the entire length of the braiding bobbin 10. For example, the deflection element 26 may extend in an axial direction up to an outer third of the additional spool 24 facing away from the braiding spool 14.

(29) As may be taken from FIGS. 1, 2 and 4, the deflection element 26 may comprise at least one first guiding element 52 and/or at least one additional, in particular the second, guiding element 54. The first and/or second guiding element 52, 54 may be formed and/or fastened to an in particular rod-shaped base body of the deflection element 26. The deflection element 26 preferably comprises the first guiding element 52 protruding in a radial direction for guiding the protective film 20. As a consequence, the first guiding element 52 may absorb forces caused from the protective film 20 in the axial direction A. For example, the first guiding element 52 is designed as a deflection pin or deflection roller. In addition, the deflection element 26 may comprise the second guiding element 54 protruding in a radial direction R for guiding the protective film 20. Protruding in the radial direction R may mean that the corresponding guiding element 52, 54 protrudes over a base element of the deflection element 26 in a radial direction R. The second guiding element 54 may also be designed as a deflection pin or deflection roller. Therefore, the second guiding element 54 may also absorb forces in the axial direction A. The first guiding element 52 and/or the second guiding element 54 may thus be designed to deflect the protective film 20 from a direction of movement in the radial direction R or inclined thereto into an axial direction A or inclined thereto, or vice versa. The first guiding element 52 and/or second guiding element 54 may ensure a reliable deflection of the protective film 20 from the braiding spool 14 to the additional spool 24. This is because a deflection element 26 that comprises the first guiding element 52 and/or the second guiding element 54 may reliably guide the protective film 20 from an area of the braiding spool 14 into an area of the additional spool 24.

(30) It has been found of especially advantage for the first guiding element 52 to be situated in the axial direction centrally and/or relative to a central section of the braiding spool 14. In addition, it has been found of advantage for the second guiding element 54 to be situated in the axial direction A centrally or relative to a central section of the additional spool 24. In this case, the protective film 20 may be deflected without a too high tensile stress causing from the braiding spool 14, so that the protective film 20 may be directed or guided to the second guiding element 54 or directly to the additional spool 24. Arranging the second guiding element 54 in an axial direction A centrally or relative to a central section of the additional spool 24 has been found of advantage, since the protective film 20 may be wound onto the additional spool 24 without a too high stress.

(31) A braiding device 12 may be gleaned at least partially and schematically from FIG. 5. The braiding device 12 is used for braiding the mandrel 28 with the pre-impregnated fiber film 18. The braiding device 12 comprises a hollow cylindrical module carrier 56. A plurality of impellers 58 shown in a simplified manner as circular elements are here provided, which are situated one behind the other on the module carrier 56 in the circumferential direction U of the module carrier 56, wherein each impeller 58 is designed to hold a braiding bobbin 10 and transfer the braiding bobbin 10 to an adjacent impeller 58. Also provided for the braiding device 12 is a plurality of braiding bobbins 10 according to the invention. The braiding bobbins 10 may be held by the impellers 58 and transferred from impeller to impeller in the circumferential direction U of the module carrier 56. The impellers 58 are preferably arranged on the jacket interior. Alternatively or additionally, the impellers may also be situated axially outside on the module carrier 56.

(32) By transferring the braiding bobbins 10 from impeller to impeller, the respective fiber films 18 from the accompanying braiding spools 14 may be braided onto the mandrel 28, wherein the mandrel 28 is transported through the hollow cylindrical opening 60 in the feeding direction V. In the process, the fiber films 18 intersect each other on the surface of the mandrel 28, so that the latter is braided with pre-impregnated fiber film 18.

(33) It is preferably provided for the braiding device 12 that each impeller 58 comprise a motorized impeller 58 rotatably mounted to the module carrier 56, with a jacket-side area for receiving, holding and dispensing one of the braiding bobbins 10.