WO2008152551A1

WO2008152551A1 - Centering unit for a stripping device

Info

Publication number: WO2008152551A1
Application number: PCT/IB2008/052240
Authority: WO
Inventors: Reto Appenzeller; Beat Locher
Original assignee: Schleuniger Holding Ag
Priority date: 2007-06-13
Filing date: 2008-06-06
Publication date: 2008-12-18
Also published as: TW200922066A; JP2010530727A; CN101675564A

Abstract

The invention relates to a centering unit for a stripping device (7) having a rotating stripping head (21) having at least one stripping blade (3) for cables (2) that may be disposed along a main axis (1), particularly coaxial cables, fiberoptic cables, insulated wires, or the like, the centering unit (5) comprising two centering jaws (4, 4') offset from one another by 180° in close proximity to the stripping blade (3), the stripping blade (3) and the centering jaws (4, 4') being disposed such that they may be moved independently of each other toward and away from the main axis (1), and the stripping blade (3) and the centering jaws (4, 4') each being electromechanically or motor-driven by means of a drive shaft or hollow shaft (6, 60) in the closing and opening direction, the centering jaws (4, 4') (corresponding to each other, if there are two) encompassing the cable (2) in a closed position (27) and thereby contacting said cable with zero force, or the centering jaws (4, 4') corresponding to each other holding the cable (2) minimally with a small amount of play at a distance from the centering surfaces (29) of the centering jaws (4, 4'). This prevents a cable to be stripped from rotating. The cable (2) thus remains motionless according to the invention, while the centering jaws (4, 4') rotate about the main axis (1) and the cable (2) during the stripping process.

Description

Centering device for a stripping device

The invention relates to a centering device for a stripping with a rotating Abisolierkopf with at least one Stripping for anordertable along a major axis cable, especially coaxial cable, optical fibers, insulated wires o. The like. Where the centering at least two offset by 180 ° to each other centering jaws in the immediate vicinity of the stripping wherein the stripping blades and the centering jaws are arranged independently of each other on the main axis and movable away therefrom again and wherein the stripping blades are each electromechanically or motor driven via a respective hollow shaft and the centering jaws via a respective drive shaft in the closing and opening direction and wherein the drive shafts the centering jaws are arranged around the main axis motor rotatable together with the hollow shafts of the stripping.

Such centering device for stripping devices are known in the art several times. The world's best known and most popular coaxial cable devices are by the Applicant and have been designated by the following type designations: HC 207, MP 257, MP 8015, MC 252, CS 5300, CS 5300MX, CS 5400. For stripping fiber optics In addition, the Applicant successfully brought the device with the type designation FO 7045 on the market. There are various patent applications and patents that protect these devices. Among them, the patent families to the following patents: US-A-5,361,384; US-A-5,243,882; US-A-5,010,797; US-A-6,321,621.

A recent development in the coaxial stripping area is WO 2006/100590 A1. Since the invention is a further development of this patent application with respect to the centering, is on the in the prior art already discussed in WO 2006/100590.

In WO 2006/100590 not only the control of the stripping knives but also the control of the centering or holding jaws compared to the prior art has been significantly simplified by each stripping and each stripping associated centering or holding jaws on one parallel or at an acute angle to the axis extended hollow shaft in the closing or opening direction electromechanically or motor driven, and that at least the hollow shaft (s) of the stripping or (s) together with the or the stripping blade (s) is driven by the motor driven rotatable about the main axis. Instead of a lever assembly, a device has been created by the shaft assembly for stripping and centering or holding jaws, which is easy to produce. At least two stripping blades and at least two centering or holding jaws are provided in order to achieve a good centering function. Preferably, each stripping knife was assigned a centering or holding jaws opposite. A stripping process takes place as indicated in WO 2006/100590 A1. The entire stripping head and its main shaft with the hollow shafts and drive shafts are constructed and rotate according to the specifications in WO 2006/100590 A1.

On the drive shafts control cam are rotatably mounted with the drive shafts, which transmit a control movement in a rotary or pivoting movement of the knife jaws and thus on the stripping knives. The longitudinal displacement thus generates the delivery or opening of the stripping blades and the centering jaws.

The "one-in-one" design with the simplest components (tubes or shafts) leads to a very stable, integrated construction.The principle of this construction also allows the provision of further stripping knives and / or centering jaws, possibly simultaneously different at different axial points of a cable cuts make. For this purpose, only the drive shaft must be hollow and a similar arrangement with appropriate distal and proximal training be provided.

The centering jaws are structured differently. While the jaws have a triangular pivoting lever with preferably slightly concave curved centering, the other centering jaws are slightly cranked lever with a straight centering. To protect the stripping a Strisolierkopfgehäuse is arranged. At the distal end of the holding body an annular groove is provided, in which an O-ring is inserted. The O-ring serves as a stop for the tubular stripping head housing when it is displaced from proximal to distal.

WO2006 / 100590A1 also includes a further development of rotating centering jaws. The V-shaped centering jaws are each on a pivot lever to the

Drive shafts attached. These rotate with the stripping head. The two V-shaped centering jaws have identical geometry and are rotated 180 ° to each other. The V-shaped centering jaws have two mutually offset in the axial direction of the cable centering surfaces that support the cable. The two centering jaws are delivered synchronously with the movement of the knife so far that the cable to be processed is supported by four surfaces on four sides before the cutting process begins. The closing movement of the V-shaped centering jaws lasts until the centering jaws rest on the cable and the spring force of the spring between the control zones is no longer sufficient to further close the centering (force-locking centering). The cable itself is not able to open the V-shaped centering jaws due to self-locking or almost self-locking. The purpose of the V-shaped jaws is to restrict the translatory degrees of freedom in the radial direction to the cable axis as far as possible. The cable should be able to move as little as possible radially to the cable axis. However, it should be prevented if possible, that a moment is exerted on the cable, which causes the cable to twist or even rotate. Next, a permanent deformation or other damage to the cable surface should be avoided.

This is achieved in that the centering surfaces are made as smooth as possible or even have a friction-reducing coating. The force on the cable must be just enough to center the cable clean. There must not be too much surface pressure. Depending on the cable, there is an optimal

Relationship between the size of the centering surfaces, the spring between the two control zones and the friction conditions. The V-shaped centering jaws are arranged so that they are as close to the Einschneidstelle. The centering surface lying in the immediate vicinity of the knife is preferably aligned parallel to the knife edge. This ensures that a limp cable can not escape locally in Einschneiderichtung the cutting movement. If the proximate centering surface is perpendicular to the knife edge, the cable could locally dodge the cutting action, which could result in staggered cutting by the two knives. In such a case, a double incision would occur, which should be avoided at all costs. This effect occurs on very fine cables rather than on somewhat thicker cables. Even a stiff cable is better managed by the arrangement of the centering. The feed movement of the two V-shaped centering jaws is coupled together. The delivery is symmetrical. Due to the interlocking design of the two centering jaws, the centering jaws - as soon as a cable is enclosed - support each other in the axial direction, which raises the centering quality. In this type of centering however, a pressing force is always exerted by the centering on the cable. This can lead to co-rotation and / or twisting of the cables with very thin cables. For this reason, the invention was aimed at and developed according to the invention according to the previous solution according to WO 2006/100590 A1. However, the inventive solution is not limited to the previous structure according to WO 2006/100590 A1. For example, the centering jaws and knife jaws can be actuated completely differently than stated in WO 2006/100590 A1.

The invention has for its object to improve the centering so or to create a new centering that or with the stripping of very fine cables, with very high precision is possible without the cable can be pinched or twisted during centering ,

This problem was solved in that the centering jaws enclose the cable in a closed position and thereby touch powerless or that the centering minimally hold the cable with a slight clearance from the centering of the centering jaws, while the cable remains at rest during the Zentherens, although rotate the centering jaws around the main axis during the stripping process. The invention is not limited to two centering jaws, ie a centering jaw pair. However, this structure with two contiguous centering jaws is preferred because of its simple mechanical design and easy control. Analogous to the construction of a centering device according to the Schleuniger Model 8015, however, three or more centering jaws could be provided, which then however need corresponding stop positions at which the centering surfaces are stopped against force-supported abutment on the cable. The The invention thus proceeds with rotating centering jaws from a frictional centering to a positive centering. By way of example, in the present patent application, the preferred embodiments are each indicated with a centering jaw pair. For this purpose, the centering device has at least two centering arms, which are arranged rotationally movable at one end to a respective drive shaft. At the other end, the centering arms according to WO 2006/100590 A1 are each arranged on a controllable swivel joint, and one centering jaw is each movably connected to the swivel joint on each centering arm. The details can be found in WO 2006/100590 A1. The

Closed position of the centering device is reached as soon as the (corresponding to each other - in the case of two) centering jaws abut each other with their centering surfaces and enclose the cable between them spaced. In order to ensure the spacing, the centering surfaces of the centering jaws have recesses. The

Recesses of two opposing (= corresponding) centering jaws are designed so that the cable is uniformly enclosed in the central region of the centering surfaces of the recesses and kept evenly spaced with clearance. The centering jaws are designed to be stepped in the area of the centering surfaces and form steps as well as shallower stepped subregions, wherein the stepped subregions lie flat on one another in their closed position. In this case, the overlapping centering jaws with their upper sides and the corresponding lower sides are each in one plane. In the region of their stages, the centering jaws support each other, and the size of the opening formed by the recesses in the overlap is cable diameter-dependent. The distance between the centering surfaces to the cable according to the invention is at least 1/100 mm or - depending on the cable diameter - several hundredths of a millimeter. This is sufficient to allow it to rotate during the stripping process Centering device exerts no pressure forces on the cable and thus ensures that the cable can not twist or co-rotate.

Further embodiments of the invention are given in Figures 1 to 12 and in the dependent claims 8 to 14.

It show here

1 shows a front view of a centering device according to the invention with centering jaws according to the invention in a first embodiment,

2 shows a perspective view of the centering device according to FIG. 1 with the main shaft indicated only symbolically, FIG.

3 shows a schematic representation of the invention

Centering jaws in a front perspective view in a second embodiment

4 shows a rear view of the centering jaws of FIG .. 3

5 shows a schematic representation of the centering jaws according to the invention in a perspective view from the front in a third embodiment

6 shows a rear view of the centering jaws according to FIG. 5

7 shows a schematic representation of the centering jaws according to the invention in a perspective view from the front in a fourth embodiment

8 shows a rear view of the centering jaws according to FIG. 7 9 shows a schematic representation of the centering jaws according to the invention in a perspective view from the front in a fifth embodiment

10 shows a rear view of the centering jaws according to FIG. 9

11 is a schematic representation of the centering jaws according to the invention in a perspective view from the front in a sixth embodiment

12 shows a rear view of the centering jaws according to FIG. 11

In Fig. 1 is a known stripping 7 with a rotating stripping head 21, with at least one stripper 3 for along a major axis 1 can be arranged cable 2, in particular coaxial cable, optical fiber, insulated wires o. The like. On the stripping head 21, the centering device 5 according to the invention is arranged. At two opposite and parallel to the main axis 1 extending bushings 24 each have a drive shaft 6 are arranged. Each drive shaft 6 carries a centering 9 and 10, which is arranged at an angle to the bearing bush 24. At the centering 9.10 two 180 ° offset from each other centering jaws 4, 4 'arranged in the immediate vicinity of the stripping blades 3, the stripping blades 3 and the centering jaws 4, 4' mounted independently of each other on the main axis 1 and moved away from this again and wherein the stripping blades 3 are electromechanically or motor-driven via the hollow shafts 60 and the centering jaws 4, 4 'via the drive shafts 6 in the closing and opening directions. The drive shafts 6 of the centering jaws 4, 4 'are at the same time rotatably arranged together with those of the stripping blades 3 about the main axis 1. According to the invention The mutually corresponding centering jaws 4, 4 'enclose the cable 2 in a closed position 27 and thereby touch it without force. In the drawings, this closing position is not shown fully closed to better recognize the geometry of the structures. Alternatively, the cable 2 is minimally held with a slight play of centering surfaces 29 of the centering jaws 4, 4 'spaced. The cable 2 remains in the rest position, while the centering jaws 4, 4 'rotate during the stripping around the main axis 1. The closed position 27 of the centering device 5 is reached when the mutually corresponding centering jaws 4, 4 'with their

Centering 29 abut each other and the cable 2 between the centering 29 include spaced. For this purpose, the centering surfaces 29 recesses 14, which are circular segment-shaped in the first embodiment of FIG. After reaching the closed position 27, the corresponding centering surfaces 29 form in their middle region a closed circle in which the cable 2 is centered and kept evenly spaced with clearance.

The centering jaws 4, 4 'are executed in the area of the centering surfaces 29 stepped and form steps 25, 26 and shallower stepped portions 25a, 26a, wherein the stepped portions 25a, 26a in the closed position 27 are flat on each other. The upper sides 35, 36 and the corresponding lower sides 37, 38 of the overlapping centering jaws 4, 4 'are in each case in one and the same plane. In the area of their steps 25, 26, the centering jaws 4, 4 'are mutually supported. The size of the recesses 14 at the

Overlap formed opening 28 is cable diameter dependent. So that the cable 2 to be centered does not move during the rotation, it has proven to be particularly advantageous that the distance between the mutually corresponding centering jaws 4, 4 'and the cable 2 in the closed position 27 is a few 1/100 mm. While in the first embodiment according to Figures 1 and 2, the centering jaws 4, 4 'are substantially V-shaped and executed with a circular portion-shaped recesses 14, have the corresponding centering jaws 4a, 4a' in their stepped portions 25a, 26a of Figures 3 and 4 in a second embodiment, the same triangular recesses 14 on. In the closed position 27, the opening 28 appears in the form of a pointed square 15. In a third embodiment according to Figures 5 and 6, the corresponding centering jaws 4c, 4c 'in their stepped portions 25a, 26a equal triangular recesses 14, wherein the triangle tips are replaced by a semicircle and the closed position 27 forms an opening 28 in the form of a circle 16. In a fourth embodiment according to Figures 7 and 8, the corresponding centering jaws 4d, 4d 'in their stepped portions 25a, 26a equal triangular recesses 14, the triangular tips are replaced by a rectangle and the closed position 27, an opening 28 in the form of a parallel to the steps 25, 26 aligned square 17 forms. In a fifth and a sixth embodiment of the figures

9 to 12, the centering jaws 4b, 4b 'and 4e, 4e' asymmetric cut surfaces. In the fifth embodiment of Figures 9 and

10, the recess 14 are only in one of the two stepped portions 25a, 26a of the corresponding centering jaws 4b, 4b 'introduced. While the centering jaws 4b only have the stepped portion 25a without a recess, the centering jaw 4b 'has a recess 14 in the form of a funnel 30. In the closed position 27, an opening 28 is formed in this way in the form of a square 18 aligned parallel to the steps 25, 26. In a sixth exemplary embodiment according to FIGS. 11 and 12, a cut is made at an angle of 45 ° to the center of the centering jaw 4e, which terminates in a straight line parallel to the stepped partial region 25a. The same recess 14 is reversed on the centering jaws 4e '. The closing position 27 here forms an opening 28 in the form of a point-shaped square 34. This last embodiment is particularly suitable for cables 2 with a very small diameter.

It is within the scope of the invention to form further geometric shapes as opening 28, z. As a hexagon, octagon or any other polygon.

It is also within the scope of the invention, the stepped portions 25a, 26a, in which overlap the centering jaws 4, 4 ', different sizes and / or wide perform.

LIST OF REFERENCE NUMBERS

1 - main axis 2- cable 3 - stripping knife

4, a, b, c, d, e - centering jaws 4 ', a, b, c, d, e - centering jaws

5 - centering device

6 - Drive shaft 7- stripping device

8 - Control cam or control lever

9 - centherm

10 centering arm

11- fixing screw 12- fixing screw

13- knife jaws

14- recesses

15- square

16- circle 17- square

18 square

19- stripping head housing

20 - main shaft

21 - stripping head

23 - holding body

24 - Bearing 25-step

25a -... stepped portion 26- stage

26a stepped subarea 27 - closed position (27)

28 - opening

29 - centering surface

30 - funnel 31 - annular groove

32 - O-ring

33 - front edge

34 - square 35 - top 36 - top

37 - bottom

38 - underside 60 - hollow shaft

In the patent claims and in the description, the indication of the indices for the components may be omitted. Reference numerals with indices mean functionally similar components with different geometry.

Claims

claims

1. Rotating centering device for a stripping device (7) with a rotating stripping head (21) with at least one rotating

Stripping knife (3) for along a major axis (1) can be arranged cable (2), in particular coaxial cable, optical fibers, insulated wires o. The like., Wherein the centering device (5) at least two staggered centering jaws (4, 4 ') in the immediate vicinity of Stripping knife (3), wherein the stripping blades (3) and the centering jaws (4, 4 ') at least over a certain distance independently of each other on the main axis (1) are arranged to wegbewegbar and back from this, characterized in that the (together corresponding - in the case of two)

Centering jaws (4, 4 ') with their centering surfaces (29) in the centering state enclose the cable (2) in a closed position (27) and touch it without power or that the (corresponding to each other - in the case of two) centering jaws (4, 4') ) keep the cable (2) in the centering state minimally spaced with a slight play of centering surfaces (29) of the centering jaws (4, 4 ') and that the cable (2) remains at rest in the centering, while the centering jaws (4, 4') rotate during the stripping process around the main axis (1).

2. centering device according to claim 1, characterized in that the closed position (27) of the centering device (5) can be reached as soon as the centering jaws (4, 4 ') - optionally at their centering surfaces (29) - abut each other and enclose the cable (2) between them without power or distance.

3. centering device according to one of claims 1 or 2, characterized in that the centering surfaces (29) of the centering jaws (4, 4 ') recesses (14) and that the recesses (14) of two opposing centering jaws (4, 4' ) are designed so that the cable (2) in the central region of the centering surfaces (29) of the recesses (14) is uniformly enclosed and kept evenly spaced with clearance.

4. centering device according to one of the preceding claims, characterized in that the centering jaws (4,4c, 4e, 4 ', 4c', 4e ') in the region of the centering surfaces (29) are designed flat stepped and steps (25, 26) and preferably flatter stepped portions (25a, 26a) form, wherein the stepped portions (25a, 26a) in the closed position (27) lie flat on each other and that optionally in their stepped portions (25a, 26a) overlapping centering jaws (4, 4 ' ) with their upper sides (35, 36) and their corresponding lower sides (37, 38) are each in a plane.

5. Centering device according to one of the preceding claims, characterized in that the (mutually corresponding - in the case of two) centering jaws (4, 4 ') in the region of their stages (25, 26) mutually support and the size of the recesses ( 14) formed at the overlap opening (28) is cable diameter dependent.

6. centering device according to one of the preceding claims, characterized in that in the centering the distance between the centering surfaces (29) and the cable (2) is at least 1 / 100mm.

7. Centering device according to one of the preceding claims, wherein the centering jaws (4, 4 ') are executed in a first embodiment in a conventional manner V-shaped characterized in that the centering surfaces (29) of the first centering jaw (4) and the second centering jaw (4 ') have circular portion-shaped recesses (14) and that the corresponding centering surfaces (29) after reaching the closed position (27) in its central region form a closed tube section in which the cable (2) is held centered.

8. centering device according to one of the preceding claims, characterized in that the corresponding centering jaws (4, 4 ') in their stepped portions (25a, 26a) have the same triangular recesses (14) and the closed position (27) has an opening (28) in Form of a standing on a square square (15) forms.

9. centering device according to one of the preceding claims, characterized in that the corresponding centering jaws (4, 4 ') in their stepped portions (25a, 26a) have the same triangular recesses (14), wherein the triangular tips are replaced by a semicircle and the closed position (27) forms an opening (28) in the form of a circle (16).

10. Centering device according to one of the preceding claims, characterized in that the corresponding centering jaws (4, 4 ') have identical triangular recesses (14) in their stepped subregions (25a, 26a), the triangular tips being replaced by a rectangle and the closing position (27) having an opening (28) in the form of a parallel one to the steps (25, 26) aligned square (17) forms.

11. Centering device according to one of the preceding claims, characterized in that the centering jaws (4, 4 ') have asymmetrical cut surfaces.

12. centering device according to claim 12, characterized in that the recess (14) only in one of the two stepped portions (25a, 26a) of the corresponding centering jaws (4, 4 ') is introduced and this example, the shape of a funnel (30) and the closing position (27) forms an opening (28) in the form of a square (18) aligned parallel to the steps (25, 26).

13. Centering device according to claim 12, characterized in that a cut takes place at an angle of 45 ° to the center of the centering jaw (4), which terminates in a straight line parallel to the stepped portion (25a) and the same recess (14) reversed on the centering jaw (4 ') and the closing position (27) forms an opening (28) in the form of a standing on a square tip (34).