METHOD FOR REMOVING A SHIELDING FOIL OF AN ELECTRICAL CABLE BY MEANS OF A ROTARY STRIPPING MACHINE, AND DEVICE FOR SUPPORTING THE REMOVAL OF A SHIELDING FOIL OF AN ELECTRICAL CABLE

Abstract

The present invention relates to a method for removing a shielding foil (K2) of an electrical cable (Ka) with a longitudinal axis (L), which cable has, going out from the longitudinal axis outward, an inner conductor (K5), a dielectric (K4), the shielding foil (K2) and an insulating sheath (K1), comprising the following steps: a. Creating an incision (EK) of a first depth (T1) in the insulating sheath (K1) of the electrical cable (Ka), for example by means of the rotating blades (23), of a rotary stripping device whereby the first depth (T1) is smaller than or the same as the thickness of the insulating sheath (K1); b. Creating a predetermined breaking point (S) in the shielding foil (K2) through pressing in of at least one radially adjustable perforation tool through the incision (EK) produced in step a. until the perforation tool has reached a second depth (T2), whereby the second depth (T2) corresponds to at least the thickness of the insulating sheath (K2) plus at least half of the thickness of the shielding foil (K2); c. Tearing the shielding foil at the predetermined breaking point (S); and d. Removing the shielding foil (K2).

The present invention relates furthermore to a device for implementing the method according to the invention.

Claims

1. Method for removing a shielding foil of an electrical cable with a longitudinal axis (L), which cable has, going out from the longitudinal axis outward, at least one inner conductor, a dielectric, the shielding foil and an insulating sheath, comprising the following steps: a. Creating an incision of a first depth in the insulating sheath of the electrical cable, whereby the first depth is smaller than or the same as a thickness of the insulating sheath; b. Creating a predetermined breaking point in the shielding foil through pressing in of at least one radially adjustable perforation tool through the incision produced in step a. until the perforation tool has reached a second depth, wherein the second depth corresponds to at least the thickness of the insulating sheath plus at least half of a thickness of the shielding foil c. Tearing the shielding foil at the predetermined breaking point; and d. Removing the shielding foil.

2. Method according to claim 1, wherein between the steps b. and c. or between the steps c. and d. the perforation tool is put back in a position outside of the insulating sheath.

3. Method according to claim 1, wherein between steps a. and b., the insulating sheath is partially or completely removed.

4. Method according to claim 1, wherein the shielding foil comprises metal and the perforation tool is connected to means for detection of a contact with an electrically conductive object, and wherein the pressing in of the perforation tool is stopped as soon as a contact of the perforation tool with the shielding foil is detected.

5. Method according to claim 1, wherein the cable has a shielding braid between said dielectric and said shielding foil, and wherein the pressing in of the perforation tool is stopped as soon as a contact of the perforation tool with the shielding foil or the shielding braid is detected.

6. Method according to claim 4, wherein a relative position of the perforation tool with respect to the longitudinal axis during the detection of a contact of the perforation tool with the shielding foil, or with a shielding braid located between said dielectric and said shielding foil, is transmitted to an analysis device.

7. Method according to claim 4, wherein after detection of a contact with the shielding foil or with a shielding braid located between said dielectric and said shielding foil, the perforation tool is advanced radially by a predetermined value in a direction of the inner conductor of the electrical cable.

8. Method according to claim 1, wherein step b. is repeated at least once after the perforation tool has been driven back and has been rotated about the electrical cable by an adjustment angle.

9. Method according to claim 1, wherein the perforation tool is a blade of a rotary stripping device, wherein the blade does not rotate during step b.

10. Method according to claim 1, wherein the perforation tool is a needle.

11. Method according to claim 10, wherein the needle is spring loaded.

12. Method according to claim 1, wherein the perforation tool is ultrasonically excited.

13. Method according to claim 12, wherein the ultrasonic excitation has a frequency between 10 and 100 kHz.

14. Method according to claim 1, whereby step c. and/or step d. is carried out by means of a removal device, which comprises clamping jaws for clamping the insulating sheath of the electrical cable or the shielding foil, wherein through a translational and/or rotational movement of the clamping jaws the shielding foil tears at the predetermined breaking point.

15. Method according to claim 14, wherein between step c. and d. and/or during step c. the clamping jaws carry out a reciprocating movement around the longitudinal axis (L).

16. Method according to claim 15, wherein with the reciprocating movement of the clamping jaws around the longitudinal axis (L) first a movement against a winding direction of the shielding braid is carried out.

17. Method according to claim 14, wherein through the movement of the clamping jaws the cable with the shielding foil is bent at the predetermined breaking point.

18. Method according to claim 14, wherein the clamping jaws move in a circular or helical way relative to the longitudinal axis (L) of the electrical cable.

19. Method according to claim 14, wherein the clamping jaws of the removal device are installed on a gimbal or Cardan suspension.

20. Method according to claim 14, wherein a surface of the clamping jaws coming into contact with the insulating sheath of the electrical cable or with the shielding foil comprises a material such that a coefficient of static friction prevailing between the clamping jaws and the insulating sheath is greater than that between a metal and the insulating sheath.

21. Method according to claim 20, wherein the surface of the clamping jaws coming into contact with the insulating sheath of the electrical cable or with the shielding foil consists of an elastomer.

22. Method according to claim 14, wherein the clamping jaws have means to generate a suction force on the insulating sheath of the electrical cable or on the shielding foil.

23. Method according to claim 14, wherein a surface of the clamping jaws coming into contact with the insulating sheath of the electrical cable or with the shielding foil has a structure increasing static friction.

24. Method according to claim 14, whereby the wherein a removed portion of the insulating sheath of the electrical cable is separated from the clamping jaws by means of compressed air and/or by means of an ejector pin.

25-41. (canceled)

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0060] FIG. 1a shows a schematic cross-sectional view of an electrical cable known from the state of the art which has a shielding foil to be removed.

[0061] FIG. 1b shows a schematic side view of an electrical cable known from the state of the art in which a predetermined breaking point has been created in the shielding foil to be removed.

[0062] FIG. 2 shows a block diagram of a first preferred embodiment of the method according to the invention;

[0063] FIG. 3 shows a block diagram of a second preferred embodiment of the method according to the invention;

[0064] FIG. 4 shows a block diagram of a third preferred embodiment of the method according to the invention;

[0065] FIG. 5 shows a perspective view of a first embodiment of a device according to the invention;

[0066] FIG. 6 shows a front view of a first embodiment of a device according to the invention;

[0067] FIG. 7 shows a perspective sectional view of a first embodiment of a device according to the invention;

[0068] FIG. 8a shows the knife flange with the blades in completely closed position;

[0069] FIG. 8b shows the knife flange with the blades in a middle position;

[0070] FIG. 8c shows the knife flange with the blades in completely open position;

[0071] FIG. 9 shows a perspective view of a second embodiment of a device according to the invention;

[0072] FIG. 10 shows a perspective sectional view of a second embodiment of a device according to the invention;

[0073] FIG. 11 shows a perspective view of a third embodiment of a device according to the invention;

[0074] FIG. 12 shows a perspective sectional view of a third embodiment of a device according to the invention;

[0075] FIG. 13 shows a perspective view of a removal device for the pulling off of the shielding foil to be removed;

[0076] FIG. 14 shows a sectional view of a removal device for the pulling off of the shielding foil to be removed; and

[0077] FIG. 15 shows a perspective sectional view of the clamping jaws of a removal device for the pulling off of the shielding foil to be removed.

PREFERRED EMBODIMENTS OF THE INVENTION

[0078] FIG. 1a shows in an exemplary way a sectional view of an electrical cable Ka known from the state of the art comprising a shielding foil K2 to be removed. Besides the shielding foil K2, the cable Ka has in addition an insulating sheath K1, a shielding braid K3, a dielectric K4 and an inner conductor K5. The depth T1 corresponds approximately to the thickness of the insulating sheath K1, the depth T2 to that of the insulating sheath K1 and at least half of the shielding foil K2.

[0079] FIG. 1b shows a side view of a cable Ka with longitudinal axis L, in which an incision EK has been cut into the insulating sheath K1 and a predetermined breaking point S has been created in the shielding foil K2. How the predetermined breaking point S is created will be explained in the following and represents a partial aspect of the present invention.

[0080] FIG. 2 shows a block diagram of a method for removing a shielding foil of an electrical cable according to a first embodiment of the present invention. The method begins with step a, with the cutting of an incision EK in the insulating sheath K1 of the electrical cable with the rotating blades of a rotary stripping machine until a depth T1 is reached. The aim of this first step is an incision EK in the insulating sheath K1 of the electrical cable Ka, without the shielding foil K2 being cut. A cutting into the thin shielding foil with rotating blade would usually also lead to injuries to the underlying layer. To ensure that the shielding foil is not cut in step a, the cutting with rotating blades is carried out to a depth T1 which is smaller than or the same as the thickness of the insulating sheath K1.

[0081] In a second method step b, a predetermined breaking point is created in the shielding foil K2 using a non-rotating perforation tool. To achieve this, the perforation tool is pressed into the incision EK until a depth T2 is reached that corresponds to the thickness of the insulating sheath and at least half of the thickness of the shielding foil. The pressing of the non-rotating perforation tool into the shielding foil suffices to create at least a predetermined breaking point S in the shielding foil K2. Preferably the perforation tool is a blade of the stripping apparatus used in step a. It is to be noted that in step b the blades of the stripping apparatus do not rotate. The perforation tool can however be another suitable tool, such as, for example, a needle. With a precise adjustment of the depth of the impression in step b, it can be ensured that the shielding braid K3 under the shielding foil K2 is not injured.

[0082] In step c the shielding foil K2 is tom at the predetermined breaking point S. In step d the shielding foil K2 is removed, preferably together with the insulating sheath K1. As is indicated in FIG. 2, a partial removal of the insulting sheath K1 can be carried out between steps a and b. Steps c and d can be carried out either manually or by means of a removal device (see FIGS. 13 to 15) provided for this purpose.

[0083] FIG. 3 shows a block diagram of a method for removing a shielding foil of an electrical cable according to a second embodiment of the present invention. Used for carrying out this method is preferably a rotary stripping apparatus comprising means for detection of a contact of the blades with a conductive object. The creation of a predetermined breaking point in the shielding foil can thereby be carried out by means of the continuous advance of the non-rotating blades of the stripping apparatus until the depth T2 is reached or until a contact of a blade with the shielding foil or with the shielding braid is detected. The possibility of detection of a contact of the blades with the shielding foil or with the shielding braid ensures that the shielding braid is not injured by the creation of the predetermined breaking point. In this embodiment a partial removal of the insulating sheath can also be foreseen between the first and the second step. It is also possible for the blades to be advanced further in the direction of the inner conductor after the detection of a contact with the shielding foil. It can thereby be ensured that a predetermined breaking point is created also in those regions where the shielding foil is overlapping.

[0084] FIG. 4 shows a block diagram of a method for removing a shielding foil of an electrical cable according to a third embodiment of the present invention. In this method, after a predetermined breaking point has been created in the shielding foil with a predetermined angular position of the blades of the stripping apparatus, the blades are put back so that they no longer touch the shielding foil, and are turned by an angle α. In this new angular position the blades are then pressed into the shielding foil again. Several such adjustments of the angular position of the tools with subsequent pressing in of the shielding foil can be foreseen. After the shielding foil has been pressed in at least twice, the sheath and the shielding foil are removed. Through the pressing in of the shielding foil using the blades in different angular positions it can be ensured that a predetermined breaking point is created along the entire circumference of the cable. Also in this third embodiment, after the rotary incision of the insulating sheath, a partial or a complete removal can be carried out.

[0085] FIG. 5 shows a perspective view and FIG. 6 a front view of a first embodiment of a device according to the invention 100 for supporting the removal of a shielding foil of an electrical cable. In this embodiment, a third toothed belt wheel 3 and a fourth toothed belt wheel 4 are driven with the same drive shaft 10 by a common drive means, here by a first motor 13. Toothed belt wheels 3 and 4 are screwed by means of screws 10a and therefore turn synchronously. Toothed belt wheel 3 has slotted holes 3a, which can be used for a relative angular rotation of the toothed belt wheels 3 and 4 to adjust the knife opening.

[0086] The third toothed belt wheel 3 drives via a first toothed belt 11 a first toothed belt wheel 1, and the fourth toothed belt wheel 4 drives via a second toothed belt 12 a second toothed belt wheel 2. The first toothed belt wheel 1 and the second toothed belt wheel 2 thus turn coaxially and synchronously. The first toothed belt wheel 1 and the second toothed belt wheel 2 are however rotatably mounted in an angularly adjustable way with respect to one another. The first toothed belt wheel 1 and the second toothed belt wheel 2 define an opening A, through which a cable with a shielding foil to be removed can be led or passed.

[0087] With reference to FIG. 7, it can be seen that the second toothed belt wheel 2 is connected to positioning pins 18 via a bearing sleeve 16 and via an adjusting ring 17. The first toothed belt wheel 1 is connected via a rotor 19 to the pivot pins 20. Connected to the rotor 19 is also a tool flange 21, here a knife flange, on which tools 23 are installed, here they are blades, in a way pivotable about the pivot pins 20. The positioning pins 18 are disposed in such a way that they engage in the blade openings 23a and thus allow the blades 23 to pivot about the pivot pins 20. Via the angular rotation between the first toothed belt wheel 1 and the second toothed belt wheel 2 a desired knife-pivot-angle λ and cutting diameter Df can thus be set.

[0088] As is seen in FIGS. 5 to 7, the second toothed belt 12 is waisted by a deflection roller 5 and a tensioning roller 6. In this embodiment, the deflection roller 5 can be shifted by a second motor 14 via spindle 7 and via a first carriage 8 in a translational way. A second carriage 9 is connected to the first carriage 8 via spring bolts 22 and spring 15.

[0089] As shown in FIG. 6, the symmetry position of the device 100 is defined as the position in which the distance D5 of the deflection roller 5 to the axis of symmetry Y is the same as the distance D6 of the tensioning roller 6 to the axis of symmetry Y. Through loosening of the screws 10a and turning of the fourth toothed belt wheel 4 relative to the third toothed belt wheel 3, a turning of the first toothed belt wheel 1 relative to the second toothed belt wheel 2 can be brought about without a displacement of the deflection roller 5 being necessary. The positioning pins 18 thereby rotate about the rotational axis X and pivot the blades 23. The position of the blades 23 can thereby be set in the symmetry position in a simple way.

[0090] FIG. 8a shows the blades in the position with the smallest cutting diameter Df.

[0091] FIG. 8b shows the blades in adjustment position, which is achieved in that, in the symmetry position, through loosening of the screws 10a and turning of the fourth toothed belt wheel 4 relative to the third toothed belt wheel 3, the turning of the second toothed belt wheel 2 relative to the first toothed belt wheel 1 is brought about and thus the closing of the blades to an adjustment-cutting-diameter Dj. In this position, the positioning pins 18 are turned with respect to the axis of symmetry Y by a so-called adjusting ring-adjustment-angle η, which subsequently serves as the basis for the geometric relationship of cutting diameter Df and deflection roller displacement e.

[0092] If now, in accordance with FIG. 6, the first carriage 8 with the deflection roller 5 is shifted from the symmetry position to the right and along direction E, the second carriage 9 with the tensioning roller 6 is also shifted to the right via the spring bolts 22 and spring 15, so that the tensioning roller 6 is pressed on the second toothed belt 12. The horizontal displacement e of the deflection roller 5 to the right in relation to the symmetry position brings about a turning of the second toothed belt wheel 2 relative to the first toothed belt wheel 1. Since the adjusting ring and the positioning pins 18 are connected to the second toothed belt wheel 2, the positioning pins 18 are turned by a so-called adjusting ring-rotation-angle ψ with respect to the tool flange and the pivot pins. As shown in FIG. 8c, this adjusting ring-rotation-angle ψ added to the adjusting ring-adjustment-angle η adds up to the adjusting ring-total-angle φ. The blades 23 are pivoted by the positioning pins 18 and from this adjusting ring-total-angle φ there results a cutting diameter Df. It is important to note that the adjusting ring-rotation-angle ψ is independent from the rotational speed of the toothed belt wheels 1, 2 and that the toothed belt wheels 1 and 2 again turn synchronously, as soon as the cutting diameter Df has been set. Hence the setting of the adjusting ring-rotation-angle ψ represents only a phase shift between the first toothed belt wheel 1 and the second toothed belt wheel 2 with respect to the adjusting ring-adjustment-angle η.

[0093] The exact mathematical correlation between the amount e of the horizontal shift of the deflection roller 5 and the cutting diameter Df will not be derived here. One skilled in the art would be able to derive this correlation without any difficulty through trigonometric considerations. It is only pointed out here that, for the cutting diameter Df, it is possible to derive the correlation between e and Df.

[0094] It is important to note that the setting of the cutting diameter Df can take place with rotating or non-rotating blades. With the device 100 it is thus possible to carry out precisely the above-described embodiment of the method according to the invention and to create a predetermined breaking point in a shielding foil. Furthermore the device 100 can comprise means for detection of the contact of the tools with a conductive object (here not shown), such as, for example, the metallic part of the shielding foil or the shielding braid. A predetermined breaking point can thereby be created even more precisely and it can be ensured that the shielding braid is not injured.

[0095] FIG. 9 shows a second preferred embodiment of a device 200 for supporting the removal of a shielding foil of an electrical cable according to the invention. Components which carry out the same function as in the first embodiment are designated here with the same reference numerals. Unlike in device 100, the toothed belt wheels 3 and 4 are not coaxially arranged. They are however drivable synchronously with the deflection belt 30 by the same first motor 13, which allows the shaft 210 to rotate. As in the device 100, the third toothed belt wheel 3, via a first toothed belt 11, drives a first toothed belt wheel 1, and the fourth toothed belt wheel 4 drives, via a second toothed belt 12, a second toothed belt wheel 2. The first toothed belt wheel 1 and das second toothed belt wheel 2 thus turn synchronously. The toothed belt wheels 1, 2 are however rotatably mounted in an angularly adjustable way with respect to one another in this embodiment too.

[0096] The deflection belt 30 is deflected with the non-movable deflection rollers 31c, 31d, whereby the movable deflection rollers 31a and 31b are installed on a carriage 32, which is movable in direction K by means of spindle 33 and track 34 movable. The spindle 33 is driven by the second motor 14 and motor belt 14a. Thanks to this mechanism, the distance between the axes of the movable deflection rollers 31a, 31b can be adjusted to the axes of the non-movable deflection rollers 31c, 31d and to the axes of the third and fourth toothed belt wheels 3, 4.

[0097] As is easy to understand from FIG. 9, a shift k of the movable deflection rollers 31a and 31b in direction K with respect to the adjustment position brings about a turning of the first toothed belt wheel 1 relative to the second toothed belt wheel 2. Since the positioning pins 18 (exactly as can be seen in the device 100 and as in FIG. 10) are connected to the second toothed belt wheel 2, the positioning pins 18 are turned in a way corresponding to the displacement k by the so-called adjusting ring-rotation-angle ψ. This adjusting ring-rotation-angle ψ with the adjusting ring-adjustment-angle η adds up to the adjusting ring-total-angle φ, as shown in FIG. 8c. The blades 23 are shifted by the positioning pins 18, and from this adjusting ring-total-angle φ there results a cutting diameter Df. It is important to note that the rotation angle ψ here too is independent of the rotational speed of the toothed belt wheels and that the toothed belt wheels 1 and 2 again turn synchronously, as soon as the cutting diameter Df has been set. Hence the setting of the adjusting ring-rotation-angle ψ merely represents a phase shift between the toothed belt wheels 1, 2 with respect to the adjusting ring-adjustment-angle η.

[0098] Unlike in the device 100, the adjusting ring-adjustment-angle η is set with the position of the carriage 32. Around this adjustment position the carriage is then shifted along the direction K, in order to set the cutting diameter Df via the adjusting ring-rotation-angle ψ. A further difference between device 100 and device 200 consists in the mathematical relationship between the displacement e of the deflection roller 5 or the shift k of the movable deflection rollers 31a, 31b and the adjusting ring-rotation-angle ψ. While in the case of device 100 there exists a non-linear relationship between deflection roller shift e and adjusting ring-rotation-angle ψ, there results in the case of the device 200 a purely linear connection between the deflection roller shift k and the adjusting ring-rotation-angle ψ.

[0099] If one of the deflection rollers 31a, 31b is designed as tensioning roller, that is preferably 31b, since the deflection roller driven in a translatory way should be placed as close as possible to the third toothed belt wheel 3 and the fourth toothed belt wheel 4 in order to minimize cutting diameter errors through stretching of the deflection belt. Preferably the sections of the deflection belt 30 between third toothed belt wheel 3 and movable deflection roller 31a as well as fourth toothed belt wheel 4 and movable deflection roller 31a run parallel to one another.

[0100] The exact mathematical relationship between k and the adjusting ring-rotation-angle ψ, will not be derived here. One skilled in the art could derive this correlation without any difficulty through trigonometric considerations. Exactly as in the case of device 100, it is possible in the case of device 200 to derive the correlation between k and Df.

[0101] It is important to note that the deflection rollers 31b, 31c and 31d can be positioned differently than is shown in FIG. 9 without the functioning of the device 200 being affected. But it is essential that these rollers assume the function of a length compensation mechanism. When the movable deflection roller 31a is moved, one or more of the deflection rollers 31b, 31c and 31d must be correspondingly shifted so that the tension of the deflection belt 30 is preserved. In particular it must be ensured that the movement of the movable deflection roller 31a does not lead to the deflection belt 30 being tom.

[0102] It is important to note that here too the setting of the cutting diameter Df can take place with rotating or non-rotating blades. Thus, with the device 200, it is also possible to carry out precisely the above-described embodiments of the method according to the invention and to create a predetermined breaking point in a shielding foil. Furthermore the device 200 can comprise means for detection of the contact of the tools with a conductive object (not shown here), such as, for example, the metallic part of the shielding foil or the shielding braid. A predetermined breaking point can thereby be created even more precisely and it can be ensured that the shielding braid is not injured.

[0103] A third preferred embodiment of a device 300 according to the invention is shown in FIG. 11. In this embodiment, the angular rotation of the otherwise synchronously turning toothed belt wheels 1 and 2, and thereby the positions of the positioning pins 18 with respect to the pivot pins 20 and thus the cutting diameter Df is achieved with a planetary gearing 50. The mechanism for pivoting of the blades with positioning pins 18 is identical in this embodiment to that of the first and second embodiments. As can be seen in FIG. 12, a first motor 13 with a first motor drive belt 13a drives the fourth toothed belt wheel 4. The fourth toothed belt wheel 4 drives, for its part, the second toothed belt wheel 2, by means of the second toothed belt 12. The third toothed belt wheel 3 drives the first toothed belt wheel 1 by means of the first toothed belt 11.

[0104] As can be seen in FIG. 12, the fourth toothed belt wheel 4 is connected to a hollow body 55, which has an inner toothing 55a. Furthermore there exists inside the hollow body 55 and in connection with the inner toothing 55a a planetary gearing 50 with planetary wheels 51 and sun wheel 52. With the sun wheel 52 standing still, the planetary wheels 51 circle around the sun wheel 52 in the same rotational direction as the fourth toothed belt wheel 4 owing to the turning of the fourth toothed belt wheel 4 and of the hollow body 55 with its inner toothing 55a. The circling of the planetary wheels 51 drives a shaft 53, which is connected to the third toothed belt wheel 3. The number of teeth or respectively the diameter of the third toothed belt wheel 3 is selected in such a way that the first toothed belt wheel 1 and the second toothed belt wheel 2 turn synchronously with stationary sun wheel.

[0105] With the second motor 14, a fifth toothed belt wheel 54, which is connected to the sun wheel 52, can be driven via a second motor drive belt 14a. The turning of the fifth toothed belt wheel 54 by angle β thus brings about the turning of the sun wheel 52. A turning of the sun wheel 52 in the same direction as the fourth toothed belt wheel 4 brings about a quicker circling of the planetary wheels 51 and thus a quicker turning of the shaft 53 and of the third toothed belt wheel 3. Since the third toothed belt wheel 3 drives the first toothed belt wheel 1, a turning of the toothed belt wheels 1, 2 and an adjusting ring-rotation-angle ψ is consequently achieved with a turning of the sun wheel 52 by angle β. As in the previous preferred embodiments, the above-described mechanism brings about the phase shift y and the adjustment of the position of the blades 23. It is important to note that the adjusting ring-rotation-angle ψ is also here independent of the rotational speed of the toothed belt wheels 1, 2 and that the toothed belt wheels 1 and 2 again turn synchronously as soon as the second motor and the sun wheel stand still, and thereby a new cutting diameter Df is set. Hence the setting of the adjusting ring-rotation-angle ψ only represents a phase shift with respect to the adjustment position.

[0106] Once again the exact mathematical relationship between the angle of rotation P of the sun wheel 52 and the cutting diameter Df will not be derived here. One skilled in the art could derive this correlation without any difficulty through trigonometric considerations. It is only pointed out here that it is also possible here to derive the correlation between P and Df. Instead of driving the sun wheel 52 via the fifth toothed belt wheel 54, it could also be driven directly via a geared motor.

[0107] It is important to note that here too the setting of the cutting diameter Df can take place with rotating or non-rotating blades. Thus, with the device 300, it is also possible to carry out precisely the above-described embodiments of the method according to the invention and to create a predetermined breaking point in a shielding foil. Furthermore the device 300 can comprise means for detection of the contact of the tools with a conductive object (not shown here), such as, for example, the metallic part of the shielding foil or the shielding braid. A predetermined breaking point can thereby be created even more precisely and it can be ensured that the shielding braid is not injured.

[0108] One skilled in the art will easily understand that the blades 23 of the devices 100, 200 and 300 could easily be replaced by perforation needles. The perforation needles then would make possible a perforation of the shielding foil and thereby create a predetermined breaking point.

[0109] It is also to be noted that although in the embodiments presented here the distance of the blades 23 in relation to rotational axis X is set by means of a pivot mechanism, one skilled in the art could of course use other known closing or respectively opening mechanisms within the scope of the present invention. In particular one skilled in the art would recognize that a spiral flange could easily be used for this. A spiral flange would in particular facilitate the blades 23 being able to be displaced radially in relation to the rotational axis X.

[0110] FIG. 13 show a removal device 400, which can be used for the tearing and removal of the shielding foil after a predetermined breaking point S has been created. The removal device 400 has a first clamping jaw 401 and a second clamping jaw 402 for clamping a cable. As can be seen from FIG. 13, the clamping jaws 401, 402 are mounted in a way rotating about the axes FA and GA. The clamping jaws 401, 402 are thereby installed on a gimbal or Cardan suspension. The removal device 400 also comprises feet 407 with which the first frame 403 of the gimbal suspension can be connected to means for translational and rotational movement (not shown here). The entire removal device 400 can thereby be shifted in a translational way along directions MA, NA and GA and rotated in rotational direction PA.

[0111] As is shown in FIG. 14, the clamping jaws 401, 402 are installed on the two pressure pistons 404. With the compressed air connections 401a, 401b, 402a, 402b compressed air can be admitted in order to adjust the position of the clamping jaws 401,402 along the axis FA. As can be seen from this figure, the clamping jaws 401 and 402 have separate compressed air connections 401a, 401b, 402a, 402b. The removal device also has torsion springs 405 about the axes GA and FA between the first frame 403 and the feet 407 and between the second frame 408 and the first frame 403. With the torsion springs 405 it is ensured that the first frame 403 and the second frame 408 in resting position, i.e. before the cable is clamped with the clamping jaws, are aligned perpendicular to the longitudinal axis L. The removal device could have a hydraulic drive instead of the compressed air drive. The clamping jaws in the gimbal suspension are preferably driven with a flow divider, for example a double piston actuator, or with a counter-rotating spindle. The clamping jaws are thereby always driven symmetrically with respect to the longitudinal axis.

[0112] FIG. 15 shows a detail view of the clamping jaws 401 and 402 of the removal device 400. The surfaces of the clamping jaws 401, 402 coming into contact with the cable have in this embodiment a structure increasing static friction. The cable can thereby be clamped better, so that the removal process takes place without the cable slipping.

[0113] Here it is to be noted that the invention is not limited to the described embodiments. It will be clear to one skilled in the art that further developments and modifications are absolutely possible within the scope of the protected invention. Device elements can be exchanged for other elements that fulfil the same or similar functions, as required. Additional devices and elements could likewise be provided. These and other measures and elements fall within the scope of the invention, which is defined by the claims.

LIST OF REFERENCE NUMERALS

[0114] 1. First toothed belt wheel [0115] 2. Second toothed belt wheel [0116] 3. Third toothed belt wheel [0117] 4. Fourth toothed belt wheel [0118] 5. Deflection roller [0119] 6. Tensioning roller [0120] 7. Spindle [0121] 8. First carriage [0122] 9. Second carriage [0123] 10. Drive shaft [0124] 11. First toothed belt [0125] 12. Second toothed belt [0126] 13. Drive means, first motor [0127] 13a. First motor drive belt [0128] 14. Second motor [0129] 14a. Second motor drive belt [0130] 15. Spring [0131] 16. Bearing sleeve [0132] 17. Adjusting ring [0133] 18. Setting means, positioning pins [0134] 19. Rotor [0135] 20. Pivot pins [0136] 21. Tool flange [0137] 22. Spring bolts [0138] 23. Tools [0139] 25. Exhaust pipe [0140] 30. Deflection belt [0141] 31a. First movable deflection roller [0142] 31b. Second movable deflection roller, movable tensioning roller [0143] 31c. First non-movable deflection roller [0144] 31d. Second non-movable deflection roller [0145] 32. Carriage [0146] 33. Spindle [0147] 34. Track [0148] 50. Planetary gearing [0149] 51. Planetary wheels [0150] 52. Sun wheel [0151] 53. Shaft [0152] 54. Fifth toothed belt wheel [0153] 55. Hollow body [0154] 55a. Inner toothing of the hollow body, annulus gear [0155] 100. Device according to first embodiment [0156] 200. Device according to second embodiment [0157] 300. Device according to third embodiment [0158] 400. Removal device [0159] 401, 402. Clamping jaws [0160] 401a, 401b, 402a, 402b. Compressed air connections [0161] 403. First frame [0162] 404. Pressure pistons [0163] 405. Torsion spring [0164] 406. Surface of the clamping jaws [0165] 407. Feet [0166] 408. Second frame [0167] λ Knife-pivot-angle [0168] η Adjusting ring-adjustment-angle [0169] ψ. Adjusting ring-rotation-angle [0170] φ. Adjusting ring-total-angle [0171] Ka. Cable [0172] K1. Insulating sheath [0173] K2. Shielding foil [0174] K3. Shielding braid [0175] K4. Dielectric [0176] K5. Inner conductor [0177] EK. Incision in the cable [0178] L. Longitudinal axis of the cable [0179] S. Predetermined breaking point in the shielding foil