EP0607851B1 - Saddle coil for cathode ray tube deflection device - Google Patents

Description

Technical field

The invention is concerned with a method for producing self-supporting saddle coils for cathode ray tubes and with a device for producing such saddle coils.

State of the art

Saddle coils for deflecting electron beams in cathode ray tubes have been known for a long time in the prior art, so that the explanation of the structure and operation of such saddle coils can be kept to a minimum.

Saddle coil arrangements for cathode ray tubes usually have the shape of a trumpet, which are formed by the pair-wise combination of two saddle coils forming the subject of the invention. The inner contour of such a saddle coil arrangement and thus also each of the two saddle coils is the outer contour of the cathode ray tube adapted in the area in which the saddle coil arrangement comprising the two saddle coils is later connected to the tube. In addition to this design, as stated in DE 28 07 978, the outer contour of the first saddle coil arrangement lying directly on the picture tube can also be surrounded by a further saddle coil arrangement, which also comprises two half-coils.

Each of these saddle coils is formed by a continuous winding train comprising several layers of wire. The course of this winding is - in a first approximation - shaped so that there are at least two wire strands running in the Z direction of the picture tube, the front and rear ends of which are each connected to one another by a so-called winding head. Each of these winding heads is essentially semicircular in shape and extends transversely to the direction of the wire strands.

The design of saddle coils just described, however, no longer does justice to today's deflection precision - particularly the one required for in-line tubes. For this reason, the saddle coils required for this purpose are formed with a plurality of wire strands running in the Z direction. The arrangement of these angularly symmetrical wire strands can be chosen so that their planes run through a common center point in a section transverse to the tube axis. Saddle coils are also known in which the planes of the wire strands running in the Z direction do not have a common center point, but rather run parallel or at an angle to one another. A course of the wire strands in the latter sense is shown, for example, in EP 0 264 807 (FIG. 4).

It may also be necessary to form the deflection field that the length of at least one wire strand arranged on one side of the saddle coil is different from the length of the other wire strands on this side, but that all wire strands on one side have the same length as the angle to these wire strands symmetrically arranged wire strands on the other side of the coil. For reasons of deflection error correction, it may even be necessary, as is particularly emphasized in DE 39 20 699, to dispense with the lateral symmetry in the slot lengths.

In order to be able to produce coils that have a winding tension corresponding to the above description, essentially two processes have been developed in the prior art.

According to one production method, the saddle coils are formed in such a way that one or more enamelled copper wires, which are also coated with a thermoplastic material, are wound into a gap. This gap is formed between two shaped winding parts, the outer contour of one shaped winding part essentially corresponding to the outer contour of the tube in the area in which the coil is later connected to the tube, and the inner contour of the other (outer) shaped winding part roughly corresponding to the outer contour of the finished saddle coil corresponds. Such an arrangement is shown with the omission of the outer wound molded part in FIG. 25 of the Philips tec Rev. 3, No. 6/7 page 166. If the arrangement shown there is connected to the outer shaped winding part while leaving a distance, the winding wire can, since the gap extends into the edge region of both shaped parts, from there by means of a suitable winding nozzle following the course of the gap in the edge area are inserted into the gap. A stationary winding nozzle is usually used for this purpose, past which the shape set in rotation is guided according to its gap course. So that the winding wire assumes its defined position in the gap or on the outer contour of the inner wound molded part, it must slide along the inner contour of the outer wound molded part until it reaches its final location. So that wire strands that are spatially separate from one another can also be formed by means of this production method, pins are inserted into the distance between the two shapes from inside to outside during the winding, which have the function of contact points. After the gap is filled with the wire winding, that is, the saddle coil is wound in the gap, the wire is heated to such an extent that its thermoplastic sheathing softens. When cooling, adjacent turns then stick together, so that the saddle coil can be removed as a self-supporting coil of the arrangement after the molded parts have been moved apart.

As can be easily seen, the sliding of the winding wire to the respectively predetermined location is extremely critical in this manufacturing process. Even improper storage of the winding wire leads to a change in the filling and sliding behavior of the wire on the mold due to the tendency of the thermoplastic sheath of the wire to swell under the influence of moisture, so that it no longer assumes its predetermined position in the gap. Other parameters which impair the reproducibility of saddle coils produced in such a technology are the surface properties of the wound molded parts and Fluctuations in the wire diameter and in the wire tension. Since pins are used to form wire strands in this technique and the wire lies against these pins, small indentations occur in the wire course in these contact areas, which reduce the quality of the deflection field generated by these saddle coils. Another disadvantage of the saddle coils produced in this technique is that it is not possible to wind the areas of the wire strands that are facing away from the pins, but only those areas that are directly adjacent to the pins, in the desired positional precision. Due to the fact that the winding wire is wound through the gap formed by the two shaped winding parts to the saddle coil and that pins are inserted into the distance between the two shaped winding parts from the inside to the outside to form wire strands, it is not possible to form strand profiles by means of this winding technique, which can easily be formed using the other manufacturing method discussed below. 11, these strand profiles, which cannot be formed in baking coil technology, are those which have a curved strand profile SV ₁ between the upper and lower end windings WK _O , WK _U , or strand profiles SV, in relation to the plane of symmetry S. ₂ , which have an area B bent away from the plane of symmetry S in the course between the upper and lower end windings WK _O , WK _U.

According to the other known manufacturing process, the saddle coils are formed on lost bobbins, which largely have the shape of the later saddle coil. The saddle coil is then formed on the surface of these bobbins by using appropriate winding devices. Like one Such a bobbin is wound, is described in EP 0 264 807. In summary, it can be said that first a lost spool is made of plastic and is releasably connected to a device that holds the spool during winding. Then the winding of the coil carrier is carried out. When the winding is complete, the (lost) coil carrier wound with the wire windings is removed from the device and can be fed to the further processing as a so-called half-coil. In addition, it is known from EP 0 279 962 to additionally bake the wire windings wound around a lost bobbin. Furthermore, it can be seen from document EP 0 264 807 (in particular its US priority application = US 4,946,112) that grooves are formed on the inner contour of the coil body to form wire strands running in the Z direction. The winding heads are accommodated in semicircular chambers which are arranged on the outer contour of the coil former. Slits are arranged in the outer walls of the chambers. The grooves open into the chambers at the locations of these slots.

The presence of the slots and chambers allows saddle coils to be produced with an extremely precise positional position of the winding wires using the last-mentioned production method. The great freedom of shape of the saddle coils produced in this technique has already been mentioned above in connection with FIG. 11. The disadvantage here, however, is that coil carriers are necessary in this manufacturing process. This is not only because the coil carrier makes the manufacture and the recyclability of such saddle coils more expensive, but because it is in contrast to this type of design of saddle coils It is not possible for baking coils to connect a ferrite core or a further saddle coil arrangement (see DE 28 07 978) to the first pair of saddle coils lying directly on the picture tube without a gap. This inevitable intermediate arrangement of the coil carrier between the winding pull and the ferrite core or the further pair of coils leads to the fact that saddle coils with coil carriers are less sensitive to deflection than baking coils.

The invention is therefore based on the object of specifying a production method for bobbin carrier-free saddle coils and an apparatus for carrying out the method, which or which will avoid the disadvantages of the known methods.

Presentation of the invention

This object is achieved from a procedural point of view by the combination of features according to claim 1 in that, in a first step, a lost turn holder is formed, which provides grooves for laying the wire strands running in the Z direction and for laying the winding heads. The winding path, which is predetermined by the winding holder, in particular by the grooves and chambers, is then wound in a second step by winding wire covered with thermoplastic material, the winding nozzle from which the winding wire runs out being essentially directly opposite the locations at which the winding wire enters the Grooves and chambers is inserted. In a third step, the winding wire is then heated above the softening temperature of the thermoplastic material enveloping it. In step 4 the cooled and thus glued saddle coil removed from the winding receptacle, the shape of the winding receptacle present during the winding being removed for this purpose. Using these process steps, self-supporting saddle coils can be manufactured with great freedom of form and with extremely high precision and speed. In particular, according to the invention it is possible to form self-supporting saddle coils, the strand courses of which — like the saddle coils formed on lost coil supports in FIG. 11 — are curved or have regions that are bent away from the axis of symmetry.

Advantageous training and further developments of the method can be found in claims 2 and 3. If either after step 2 or step 3 until the saddle coil has cooled and glued, a stamp is placed on the surface of the winding receptacle, which presses the wire strands running in the grooves together through its surface structure, wire strands are formed which have a very uniform cross section. If, according to claim 3, the wire ends of the winding wire are connected to a power source for heating, a very uniform heating of the coil wound on the winding holder can be achieved.

A device for carrying out the method is specified in claim 4. For this purpose, the winding receptacle, on the outer and inner contour of which the winding coil of the saddle coil is formed, is formed by a base body, one side of which has an incision in the form of a trumpet halved along the central axis, and segments which are removably connected to the inner contour of the incision and the one with the main body connected state form chambers and grooves for receiving the wire strands and end windings, this has the advantage that no lost bobbin need to be used to form saddle coils with high positional accuracy of the individual winding wires. Rather, if the saddle coil is wound and baked on the winding receptacle, the shape of the winding receptacle that is present during the winding can be dissolved to remove the saddle coil from the base body by detaching and removing the segments from the inner contour of the incision.

Advantageous embodiments of the device can be found in claims 5 to 8. If, according to claim 5, the segments are divided into two groups of segments, one group of segments on the incision contour with the larger and the other group of segments on the incision contour with the smaller radius releasably connected, all segments of a group can be pulled out parallel to Detach the direction of the central axis from the base body. It is particularly advantageous if, as stated in claim 7, an appropriate tool is used to remove and insert the segments of a group. A particularly high precision of the wire strands running in the grooves formed by the segments is achieved if a punch can be inserted into the incision connected to the segments, on the surface of which ribs are formed which, in the inserted state, the wire strands running between the segments against the Press the contour of the incision in the base body. If, according to claim 8, the upper, the lower or both edges of the base body are graduated in the region of the incision, the length of the wire strands in the grooves can be varied in a very simple manner by this configuration of the base body.

Brief presentation of the figures

Figur 1

eine Windungsaufnahme im unmontierten Zustand,

Figur 2

eine Windungsaufnahme im montierten Zustand,

Figur 3

eine Detailzeichnung im Ausschnitt,

Figur 4

eine Wickelvorrichtung in Seitenansicht,

Figur 5

eine Wickelvorrichtung in Draufsicht,

Figur 6

eine Windungsaufnahme in Seitenansicht,

Figur 7

eine Windungsaufnahme in Draufsicht,

Figur 8

eine weitere Darstellung gemäß Figur 6,

Figur 9

eine bewickelte Windungsaufnahme in Seitenansicht,

Figur 10

eine weitere Darstellung gemäß Figur 1, und

Figur 11

eine Draufsicht auf eine Sattelspule, die auf einen verlorenen Spulenträger gewunden ist.

Show it:

Figure 1

a winding pickup in the unassembled state,

Figure 2

a winding pickup in the assembled state,

Figure 3

a detailed drawing in the cutout,

Figure 4

a winding device in side view,

Figure 5

a winding device in plan view,

Figure 6

a turn view in side view,

Figure 7

a winding view in top view,

Figure 8

6 shows a further illustration according to FIG. 6,

Figure 9

a wound winding view in side view,

Figure 10

a further representation according to Figure 1, and

Figure 11

a plan view of a saddle coil which is wound on a lost bobbin.

Ways of Carrying Out the Invention

Figure 1 shows the components of a winding receptacle 10 in the unassembled state. These components are the base body 11 and the segments 12. The base body has an incision 13 on its side facing the viewer, which has the shape of a trumpet halved along the central axis. In FIG. 1, the segments 12 are divided into two groups of segments 12.1, 12.2, the one group of segments 12.1 being arranged above the cut 13 with the larger and the other group of segments 12.2 below the cut 13 with the smaller radius. The shape of the segments 12.1, 12.2 is adapted to the contour of the incision 13, so that the segments 12.1, 12.2 along the direction of the arrow into the incision 13 are insertable and rest in the inserted state on the contour of the incision 13. Such a situation, in which the segments 12.1, 12.2 are inserted in the incision 13, is shown in FIG. 2. It can be clearly seen that the segments 12.1, 12.2 are arranged next to one another at a distance from one another on the inner contour of the incision 13, so that between two adjacent segments 12.1; 12.2 of each segment group are formed together with the jacket contour of the cut grooves 14. The grooves 14, which are formed by the segment group 12.1, are aligned with the grooves 14 formed by the segment group 12.2, so that continuous grooves are present on the inner contour of the incision 13. The length of the segments 12.1, 12.2 is dimensioned such that when they are inserted in the incision 13, the upper and lower edges 15.o, 15.u protrude. In addition, since the ends of the segments 12.1, 12.2 protruding from the incision 13 have a course bent away from the central axis, the ends together with the edges 15.o, 15.u of the base body 11 form the chambers 16.o and 16 u.

The winding receptacle 10 shown in FIG. 2 or the components forming it (base body 11 and segments 12.1, 12.2) are connected to one another only for the purpose of forming a saddle coil. If the saddle coil has been formed on the winding holder 10, the segments 12.1, 12.2 can be detached from the base body 11 and the saddle coil can be lifted off the base body 11.

In order to ensure the firm but detachable connection between the segments 12 and the base body 11, a detailed section is shown in FIG. 3, which illustrates how the segments 12 are during winding the saddle coil are connected to the base body 11. For this purpose, hooks 17 are arranged on the side of the segments 12, which faces the contour of the base body 11, which, when the segment 12 and base body 11 are connected, protrude into blind holes 18 inserted in the base body 11 and there from at least one displaceably arranged pin 19 in Base body 11 are locked in position.

In addition, it should be pointed out that the fastening of the segments 12 is not limited to the type shown in FIG. 3. Rather, any type of fastening of segments 12 to the base body 11 can be selected, which allows the segments 12 to be firmly but releasably connected to the base body 11.

It is also not necessary that the segments 12 - as shown for example in Figure 1 - be divided into groups 12.1 and 12.2. In another embodiment, the segments 12 can also be continuous, that is to say formed from one piece. In this case, however, to remove or connect the segments 12 to the base body 11, it is necessary for the segments 12 to be removed or connected to the base body 11 because of their ends bent away from the central axis in the direction of the central axis be moved.

The winding receptacle 10 is connected to the holding arm 20 of a winding device 21, which is shown in FIG. 4 in a side view, in order to form the saddle coil. A stand 23 is arranged on a base plate 22 and its upper end is connected to the holding arm 20 for the winding receptacle 10. In addition, there is a device on the base plate 22, which in three planes perpendicular to each other can be moved. This device has a bearing block 24 for a horizontal rod 25, the other end of which is arranged in a carriage 26. The carriage 26 can slide on a further horizontal rod 27 which is arranged at right angles to the rod 25. The rod 27 is connected to the base plate 22 via two bearing blocks 28. A carrier 29 is slidably arranged on the rod 25 and holds a further vertical rod 30. A bracket 31 can slide on this rod 30. The holder 31 has a channel for the winding wire 32 (drawn in broken lines) 33, at one end of which there is an inlet nozzle 34 and at the other end of which there is a horizontal winding nozzle 35. An outlet nozzle 36 is attached to the free end of the winding nozzle 35. The inlet and outlet nozzles correspond to the commonly used nozzles.

The holding arm 20 with the winding receptacle 10 can rotate about the longitudinal axis of the stand 23. The carriage 26 and thus the rod 25 can move along the rod 27, that is to say perpendicular to the plane of the drawing. The carrier 29 is movable in the direction of the double arrow 37 along the rod 25. The bracket 31 can be moved in the direction of the double arrow 38 along the rod 30. The three movements mentioned are perpendicular to one another and thus the outlet nozzle 36 can be brought to any point of the space enclosed by the movement planes.

The drive devices necessary for the movements mentioned are not shown in the schematic representation of the device for winding saddle coils for the sake of a better overview. Likewise, only a short piece of winding wire 32 is in the Inlet nozzle 34 and the outlet nozzle 36 shown. An output device for the winding wire 32 is also not shown for the sake of clarity.

FIG. 5 shows the top view of the device for winding the saddle coils according to FIG. 4. From this illustration, the possible movement of the carriage 26 along the rod 27 can be clearly seen and is indicated by the double arrow 39. It can also be seen that the bearing block 24 extends over the entire width of the base plate 22 and has a receptacle for the end of the rod 25 in the region of the rod 27 opposite it. The movement of the holding arm 20 with the winding receptacle 10 about the longitudinal axis of the stand 23 is indicated by the curved double arrow 40.

The winding process is described below. In the associated figures, only the winding receptacle 10 with its grooves 14 and the chambers 16.o, 16.u for receiving the winding wire 32 is shown in order to be able to clearly depict the winding process.

The winding receptacle 10 is shown in side view in FIG. It is clearly evident from this figure that the grooves 14 and chambers 16.o, 16.u are formed by means of the segments 12 inserted into the incision 13 in the base body 11. For winding the saddle coil, the winding nozzle 35 is in the starting position a. From this position, the winding nozzle 35 moves downwards, then below the lower edge, which is formed by the ends of the segments 12, and then upwards in front of the groove 14 to be wound. The winding nozzle 35 then continues to move above and to the right up to the position designated b above the upper edge formed by the ends of the segments 12. From here there is a movement to the right and then down to the position labeled c. FIG. 7a shows the winding receptacle 10 in plan view and the winding nozzle 35 in position c. The winding holder 10 now rotates clockwise by 180 ° (arrow 41), the winding wire 32 being placed in the upper chamber 16. At the end of this process, the position shown in FIG. 7c is reached. FIG. 7b shows the winding receptacle 10 with a partially broken edge in order to show the winding wires 32 lying in the chamber 16.o below. From this figure it can also be seen that the planes of the grooves 14 and thus the planes of the later wire strands of the saddle coil do not run through the center 42 of the winding receptacle 10. The winding nozzle 35 then moves upwards, that is to say out of the plane of the drawing, and the winding holder 10 rotates through 180 ° in the counterclockwise direction (arrow 43). At the same time, the winding nozzle 35 moves to the left until the position shown in FIG. 7d, which is denoted by d, is reached.

FIG. 8 shows the position d of the winding nozzle 35 and the winding holder 10 shown in FIG. 7d again in a side view. The winding nozzle 35 now moves downwards until it has reached position e. From here it then moves to the left and then upwards until it has reached the lower chamber 16 .u formed at the lower edge of the winding receptacle 10 by the projecting segments 12. In this position, the winding receptacle 10 is rotated counterclockwise by 180 °, and the winding wire 32 is turned into the said one Chamber 16.u inserted. Then the winding nozzle 35 moves back into the position designated by e and the bobbin is rotated clockwise by 180 °, the winding nozzle 35 simultaneously moving to the top right and reaching the dashed position g. This position corresponds approximately to the starting position of the winding process and the next turn is wound in the same way. When the first groove 14 is filled, the winding nozzle 35 moves from its starting position to the next groove and carries out the winding process as described. The winding process shown in connection with FIGS. 6 to 8 is not limited to a winding device according to FIGS. 4 and 5. Rather, any other winding device that is suitable for placing the winding wire 32 on both sides of the contours of a winding receptacle 10 in the grooves 14 and chambers 16 provided for this purpose can also be used for the execution of the winding steps. The term "on both sides of a contour" is understood in the above sense to mean a winding in which a part of the winding pull on the outside of a contour (here the wires laid in the chambers 16) and another part of the winding pull on the inside of a contour (here the wire strands running in the grooves 14) is formed.

A fully wound winding receptacle 10 is shown in FIG. 9. It can be clearly seen from FIG. 9 that part of the winding train forming the saddle coil is formed on the outside of the segments 12, that is to say in the upper and lower chambers 16.o, 16.u. The wire strands, which run in the grooves 14 formed by the segments 12 on the inside of the base body 11, are shown in dashed lines in this illustration. In deviation from the previous presentation the underside of the base body 11 is stepped. Due to this stepped design of the underside 15.u of the base body 11, it allows the length of the wire strands which run in the grooves 14 on one side of the coil to be chosen differently, which leads to a flat (not cranked) winding head which is advantageous for some applications. A funnel-shaped stamp 43 is arranged above the wound winding holder 10. The surface contour of the punch 43 has ribs 44 which, when the punch 43 is lowered in the direction of the arrow, engage in the grooves 14 formed between the segments 12. Depending on the procedure, the punch 43 can already be lowered into the winding receptacle 10 while the winding train is being heated, or it can only be lowered onto the winding receptacle 10 after the winding train has been heated. This stamp 43 has the function of pressing the wire strands running in the grooves 14 after they have been heated and until the winding train has cooled down against the contour of the incision 13. This measure ensures that the wire strands get a very uniform cross-section after cooling. The winding of the winding is carried out in the example shown in FIG. 9 in that the wire ends 45 are connected to a suitable power source (not shown) which heats the winding wire 32 covered with thermoplastic material to such an extent that the thermoplastic sheathing softens. If the current source is decoupled from the wire ends 45 after the softening and the winding is cooled, advantageously by blowing cold air in, the winding wires forming the saddle coil are glued together.

Removing the saddle spool 46 from the winding receptacle 10 is shown in FIG. First, the two segments 12.1, 12.2 combined in groups are separated from the base body 11 by moving them in the direction of the arrow. A device 47 which proves all segments 12.1; belonging to a group of segments 12 proves to be very advantageous when removing, as well as when inserting the segments 12. 12.2 grips at its upper edge. If the segments 12.1, 12.2 are removed from the base body 13, the baked saddle coil 46 can either be pulled out of the incision 13 in the base body 11 or removed to the front with a view of the figure.

The gradation of the lower edge 15 .u of the base body 11 also shown in this figure is not limited to this side of the base body 11. Rather, in another embodiment, this gradation can also be formed on the upper edge 15.o of the base body 11 and on both edges 15.o, 15.u of the base body 11. Furthermore, the gradation of the edges 15.o, 15.u can also be formed in the reverse order, so that the highest steps are not formed on the side edge of the coil, but in the middle thereof.

Claims (8)

1. Method for manufacturing self-supporting saddle coils (46), characterised by the following steps given in the temporal sequence of their application:

   Step 1   Construction of a non-disposable coil seat (10), in that a recess (13), which has the form of a trumpet halved along its centre line and which is formed on one side of a base member (11), which forms one part of the coil seat (10), is connected on its inner contour to segments (12), wherein the segments (12) connected to the base member (11) form grooves (14) and compartments (16.o, 16.u) for receiving the wire strands and coil winding heads,

   Step 2   Winding of the coil shape predetermined by the grooves (14) and compartments (16.o, 16.u) by means of a winding wire (32) covered with thermoplastic material, wherein a winding spindle (35), from which the winding wire (32) runs out, stands in the main directly opposite the regions of the grooves (14) and compartments (16.o, 16.u) in which the winding wire (32) is inserted specifically into a groove (14) or compartment (16.o, 16.u),

   Step 3   Heating of the winding wire (32) beyond the softening point of the thermoplastic material covering it,

   Step 4   Removal of the cooled and hence bonded winding pattern from the coil seat (10), to which end the shape possessed by the coil seat (10) during the winding is cancelled beforehand by removal of the segments (12) from the base member (11).
2. Method according to claim 1,
   characterised in that after either step 2 or step 3, up to the cooling and bonding of the saddle coil (46), a stamp (43) is placed on the surface of the coil seat (10), which stamp (43), by virtue of its surface structuring, presses together the wire strands running in the grooves (14).
3. Method according to claim 1 or claim 2, characterised in that in order to heat the winding wire (32) the wire ends (45) are connected to a power source.
4. Apparatus for executing the method according to claim 1,

   - with a winding apparatus (21) whose winding spindle (35) forms the winding pattern of the saddle coil (46) due to the fact that the winding spindle (35), from which the winding wire (32) runs out, is positioned directly opposite the regions of the grooves (14) and compartments (16.o, 16.u) in which the winding wire (32), specifically in order to form a wire strand, is placed in the respective groove (14) or, specifically in order to form a winding head, is placed in the respective compartment (16.o, 16.u) and

   - with an apparatus for heating the thermoplastic covering of the winding wire (32),

   characterised by the fact that the coil seat (10), on whose outer and inner contour the winding pattern of the saddle coil (46) is formed, comprises a base member (11), whose one side has a recess in the form of a trumpet halved along its centre line, and segments (12) which are removably connected to the inner contour of the recess (13) and which, when they are connected to the base member (11), form together with the latter the grooves (14) and compartments (16.o, 16.u) for receiving the wire strands and winding heads.
5. Apparatus according to claim 4,
   characterised in that the segments (12) are divided into two groups of segments (12.1, 12.2) and that the one group of segments (12.1) is detachably connected on the recess contour to the greater radius and the other group of segments (12.2) is connected on the recess contour to the smaller radius.
6. Apparatus according to claim 4 or claim 5,
   characterised in that a stamp (43) can be inserted into the recess (13) connected to the segments (12), on the surface of which stamp (43) ribs (44) are formed, which, in the inserted state, press the wire strands running between the segments (12) against the contour of the recess (13) in the base member (11).
7. Apparatus according to claim 4 or claim 5,
   characterised in that an insertion and removal aid (47) for segments (12) is provided, which makes it possible to insert all the segments (12) into the recess (13) and also remove them from the recess (13) simultaneously.
8. Apparatus according to claim 4,
   characterised in that the upper, the lower or else both edges (15,o; 15,u; 15,o, 15.u) of the base member (11) are of stepped construction in the region of the recess (13).

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