DE3546079C1 - Apparatus for stripping the inner conductor at the end of a solid-jacket coaxial cable - Google Patents

Abstract

An apparatus for stripping the inner conductor at the end of a full-jacket coaxial cable is presented. The apparatus has a clamping device, in which the cable can be fixed rotatably about its axis, but undisplaceably in the axial direction. A holding device is provided, which is movably designed and holds the clamping device in such a way that the clamping device is movable perpendicularly with respect to the axis of the clamped cable. There is at least one circular saw with a saw blade, the axis of rotation of which runs parallel to the axis of the clamped cable and which is arranged such that the cable meets the saw blade when the holding device is suitably moved. An apparatus bed bears the holding device and the circular saws. At least one limiting device is designed and arranged adjustably in such a way that the clamping device, and consequently the cable, can be advanced by a defined minimum distance towards the outer circumference of the saw blade.

Description

The invention relates to a device for exposing the Inner conductor at the end of a full-jacket coaxial cable the preamble of claim 1.

Solid sheath coaxial cables are used for high-frequency lines, used especially in the highest frequency range. The critics Areas of such lines are the transition point len between cable and plug or between two other cables to be connected or between a cable and a circuit, because at these points due to abrupt  Changes in the geometric relationships reflections can kick. It is imperative to avoid these reflections Avoid, as otherwise the signals to be transmitted are disturbed will.

So far, one goes to the end when exposing the inner conductor a solid sheath coaxial cable (for subsequent connection bring a plug or the like) in such a way that one with pipe cutter-like devices in which a circular disc-shaped knife on the circumference of the jacket is rolled, cuts or cuts the coat and then subtracts. In the case where the isolation between Inner conductor and sheath to be removed, happens this either with a separate knife or in the same Cutting process. With this type of separation of the jacket However, this is deformed in such a way that at the separating edge cross-sectional tapering occurs. Such cross section However, rejuvenations bring an abrupt jump in the world len resistance of the cable with it, so that there too Reflections of the signals is coming.

Another difficulty in using the known Devices is that often between the end of the mantle and the (proximal) beginning of the exposed A piece of insulating material must remain. In this case, the cutting device must have a second one Times are set, which is extremely cumbersome and therefore is cost-increasing.

From US-PS 41 79 956 is a device of the beginning known type known, but the ge for manual operation is thought. You have to coaxial with this device Hold the cable by hand, with precise control of the For this reason alone, the incision depth is not always is guaranteed. In addition, it can tilt the hand held assembly for deformation of the cable jacket or the inner conductor, etc.  

From US-PS 22 68 820 it is known that one circumferential cut through the isolation of a Cable can lead by a rotating disc-shaped Ge separator is used and the cable in one Fixing device is rotated about its axis. Here too the arrangement is actuated again by hand, moreover, exact depth control is then if multiple cuts are required due to the arrangement shown there not possible.

From US-PS 40 62 110 it is known that circle use saws when cutting cable sheaths can. However, there is no teaching to be found in this publication take how to strip coaxial cable.

From the US-PS 36 14 905 is a table device for Editing the ends of coaxial cables known. The before direction has a motor drive and Clamping device and adjustable depth stops for the coaxial cables to be processed. An essential one The problem with this known device is, however in that to perform various cuts Cables are inserted into different parts of the device have to. In addition, it can also with this arrangement for bending the cable jacket or inner conductor etc. come because exact guidance is not guaranteed.

Finally, it is known from DD-PS 33 473 that one Cable fixed by means of a rotatably mounted collet hold and to cut the cable insulation around the Axis can rotate. This arrangement also does not work very exact, moreover it is not possible to have several Make cuts on the coaxial cable without the device readjust.

Based on the above prior art, it is Object of the present invention, a device of type mentioned to the extent that a  exact, yet fast processing of coaxial cables is possible.

This object is achieved by the characterizing features of claim 1 solved.

With a device designed in this way you can Route the coaxial cable to the saw and during the saw operation, the rotation being carried out by the saw applied torque is supported. The limitation device was previously set so that the saw blade only to the desired depth, either to the iso layer or to the inner conductor, can penetrate, so that the layer to be kept intact (insulation or interior conductor) is essentially not touched by the saw. This sawing process surprisingly enables the shape of the cable sheath essentially unchanged to keep.

In a preferred embodiment of the invention the holding device with a depth stop for that Cable equipped in the axial direction of the clamped Cable attached and adjustable in this direction. Since the saw and the holding device in the axial direction too can be fixed or fixed, you can with this simple training a defined lengths Adjust the section of the jacket without measuring.  

In a further preferred embodiment of the invention is the jig of an electric motor drivable. The speed of rotation of the jig tion is relative to the rotational speed of the Saw blade chosen relatively low. By this measure a particularly even cut is guaranteed. In this case, the electric motor is preferably on the holding device direction is fixed, so it is moved together with this. This is a particularly simple coupling of the electric motor to the jig - for example via bevel gears - possible.

The clamping device is advantageously a clamping device designed pliers device, the clamping bush in closing direction is biased by spring means. With one of the like training ensures that the cable with highest accuracy fixed in the jig can be, where you then insert the collet of a new cable to be processed simply by closing squeezing the spring means can open what the job much easier with the device.

The clamping bush is preferably replaceable in the pivot bearing the jig fixed. That way you can then when you have to switch to a different cable size, just change the collet while that Bearing, possibly with a coupled electric motor the holding device remains.

The holding device can be used as a (linearly moving) slide training that is accessible to the saw. Constructive however, it is easier if the holding device than Lever is formed, which is pivotable at one end a lever bearing is attached to the device bed, wherein the pivot axis of the lever bearing parallel to the axis of rotation of the saw blade (or the axes of rotation of the saw blades) and the jig runs.  

In a first preferred embodiment of the invention the limiting device includes an adjustable stop screw, the stop screws over the holder on the front directional bed are held in corresponding threads and with the holding device in the set minimum got ready to go. Of course it is too possible to provide the reverse order, so that the Stop screws are seated in threads, which on the holder device (slide or lever).

In another preferred embodiment of the invention the limiting device includes a setting Direction for the (or each) saw arranged in this way and is designed so that the (or each) saw in one Angle ≠ 0 ° to the direction of movement of the clamping device is movable at the point of the minimum distance. Then, when the clamping device sits on a carriage and is linear, for example in the horizontal direction, is moving, arranges the saw at an acute (or right) angle to the Movable horizontal. When the adjuster on a lever is held movably along a circular path, you can see the saw (or any saw) in horizontal or in Arrange adjustable in the vertical direction, since both Rich cuts (with a suitable arrangement) the circular path. In both cases, the depth of cut becomes minimal distance between the movement path of the adjusting device or the cable and the saw circumference. Once the Is cut, the cable can be completely on the saw sheet are passed without the coat touched again. Of course you can use this one combine actuator with the former to for example to achieve a higher setting accuracy.

Preferably two saws are provided, the saw blade of which ter are arranged parallel to each other. Here are the Saber blades seen in the axes of rotation one behind the other ordered, whereby between the saws (perpendicular to the rotation axis of the saws) there is a distance. Through this  Type of arrangement you can easily cut two Execute directly one after the other without the cable again to have to clamp. Two cuts are always necessary then dig if exposed between the proximal end of the Ver inner conductor and the edge of the jacket insulating material should stay.

Setting the remaining one is particularly easy Length of the insulation material if you saw one of the saws for example via a fine shoot in a swallow tail guide parallel to the axis of rotation of your saw blade slidably supported on the device bed. The second Saw can be fixed, because a distance through the Depth stop is specified and only the second distance must be adjustable.

The arrangement is particularly simple and space-saving, if you put the bearing of the lever between the two saws arranges so that you can the jig with cable first moving in one direction towards the first saw and then - after completing the first step - on moved the second saw towards and the second cut can be carried out.

Of course it is also possible (with the second preferred embodiment of the depth of cut setting) arrange more saws to make more cuts) z. B. with three-pin axial cables) or a cable to sever the piece.

For a better understanding of the invention, the following are preferred embodiments of the invention with reference to Described in more detail, which further fiction essential features can be seen. Each shows

Fig. 1 shows the end portion of an already processed solid-bowl coaxial cable,

Fig. 2 is a front view of a first preferred embodiment of the invention;

Fig. 3 is a plan view of the device of Fig. 2;

Fig. 4 is a partial representation of a depth stop according to Figure 3 in a partially sectioned side view.

Fig. 5 shows a further preferred embodiment of a motor-driven clamping device;

Fig. 6 is a jig in longitudinal section;

Fig. 7 shows another preferred embodiment of the inven tion in a representation similar to that of FIG. 2;

Fig. 8 shows a third preferred embodiment of the inven tion in front view according to Figures 2 and 7. and

Fig. 9 is a plan view of the apparatus of FIG. 8.

As shown in Fig. 1, a to be processed full sheath cable 1 from a sheath 2 , in the interior of which an inner conductor 4 is arranged coaxially, a concentric insulating layer 3 being arranged (cast) between the inner conductor 4 and the sheath 2 .

To edit such a cable is used in the fol lowing with reference to FIGS . 2 and 3 device. The device has a device bed 7 , which can be configured essentially plate-shaped. At egg ner end edge of the device bed 7 , a bearing block 22 is attached in the center, which carries a holding device 20 for a clamping device 10 via a rotary bearing 21 . The holding device 20 is designed as a lever 21 . The lever 21 can be pivoted in the arrow directions shown in FIG. 2.

Saws 30, 40 are mounted on the device bed 7 on both sides of the bearing block 22 , the saws 30, 40 each comprising a saw blade 31, 41 which is fastened on a shaft 33 or 43 of a drive motor 32 or 42 . The motor 42 on the left in the drawing is arranged on a solid base 44 , which in turn is mounted on the bed 7 . The right-hand motor 32 in the drawing is also mounted on a base 34 , but this base is divided into a base portion 35 on the engine side and a base portion 36 on the bed side, both of which together form a dovetail guide. In this dovetail guide, the motor 32 is adjustable in the direction of its axis of rotation via an adjusting screw 37 .

As shown in Fig. 3, is mounted a depth stop 23 on the lever 21 which comprises a lever 21 fixed to the bracket 24 with an end internal thread is held in the adjusting screw 25 a.

The thread in the bracket 24 is arranged in such a way that the adjusting screw 25 extends coaxially to a cable 1 inserted into a clamping device 10 . This is shown again, more precisely, from FIG. 4.

Furthermore, upwardly projecting holders 52, 62 , which have threads on their upper end, are arranged on the bed 7 , essentially on the front edge, which supports the bearing block 22 , and are arranged so as to project into the stop screws 51, 61 in the direction of the lever 21 . The arrangement is such that when the lever 21 is pivoted in the direction of the arrows shown in FIG. 2, the lever 21 is limited in its clockwise movement by the stop screw 51 , in its opposite movement by the stop screw 61 .

As shown in Fig. 4, in the simplest case, a bearing 11 is mounted in the lever 21 , in which the clamping device 10 is rotatably seated. The clamping device 10 can be removed from the bearing 11 .

The device described with reference to FIGS. 2 to 4 is used in such a way that first a cable 1 to be processed is inserted into the Einspannvor device 10 so far that its end comes into contact with the stop screw 25 . Then you set the saws 30, 40 in motion and tilt the lever 21 first in one direction, for example to the right, so that the first saw blade 31 cuts into the jacket of the cable 1 . Here you turn the cable 1 so that the cut is made around the cable 1 around. The adjusting screws 51, 61 have been previously set so that the cut is only carried out to the desired depth, that is to the insulating layer 3 or to the inner conductor 4th After performing the first cut, pivot the lever 21 to the other side and perform the second cut. The positioning of the cuts in the longitudinal direction of the cable 1 is shown in FIG. 7 with broken lines.

In the preferred embodiment of the device shown in FIG. 5, the clamping device 10 is also rotatably mounted via a bearing 11 in the lever 21 . In addition to the embodiment according to FIG. 4, a bevel gear 12 is fastened here on the clamping device 10 by means of a clamping nut 13 . An electric motor 14 is attached to the lever 21 , the drive bevel gear 15 of which meshes with the bevel gear 12 of the clamping device 10 . In operation of the device designed in this way, the cable 10 , which is fixed in the clamping device 10 , can be rotated via the motor 14 before and while the cuts are carried out with the saws 30, 40 . This way the cut will be even cleaner.

In Fig. 6, a preferred embodiment of the clamping device 10 is explained in more detail. Here, the bearing 11 is designed as a ball bearing, while the bevel gear 12 is just reattached to the clamping device 10 . The tensioning device 10 itself has a tensioning bush 16 , which is provided with a slot 18 in the usual manner and is drawn into a sleeve 19 via a spring 17 , which sleeve 19 is fixedly connected to the bearing 11 . The sleeve 19 serves on the one hand as the counter bearing of the spring 17 , and on the other hand a retaining ring 26 which is screwed onto the clamping bush 16 and which can be removed. To operate the device is pressed when inserting and removing a cable 10 on the retaining ring 26 , so that the clamping bush 16 emerges from the sleeve 19 and expands. As soon as you release the retaining ring 26 , the spring 17 tightens an inserted cable again. If you want to edit cables of different diameters, only one clamping bush 16 with a corresponding hole must be used, all other parts are retained.

In Fig. 7 of the invention (the sake of completeness), another preferred embodiment shown, merely by det under failed from that according to Figs. 2 and 3 that the adjustment screws 51, 61 and their holders 52, 62 on the lever 21 are attached and come into direct contact with the device bed 7 when the end of the pivot path of the lever 21 is reached.

In another preferred embodiment of the invention shown in FIG. 8, the basic structure is an arrangement as already shown and described in FIG. 2, but the limiting devices 50, 60 determine the depth of cut of the saws. 8 and 9 as seen from the FIG., Are here both saws 30, 40 are arranged on the apparatus bed 7 parallel to this displaceable bar. The displaceability is ensured in each case via dovetail guides 54, 64 , the adjustment being carried out using adjusting screws 55, 65 which are known per se. The direction of displacement, which runs parallel to the upper surface of the device bed 7 , thus intersects (seen as a vector) the path of movement of the Einspannvor device 10 on the lever 21st The way that Einspannvor direction 10 travels when pivoting the lever 21 to the lever bearing 21 ' is shown in Fig. 8 with an interrupted NEN line. If one moves the saws 30, 40 by actuating the adjusting screws 55, 65 by an amount d ₁ , there is - as shown in FIG. 8 - a change in the minimum distance that the Einspannvorrich device 10 to the circumference of the saw blade 31 in question, 41 can take. In this way, the cutting depth can be adjusted very precisely by simply moving the saws horizontally. Of course, this type of limitation for the depth of cut can be combined with one of the previously described limitation options.

Claims (13)

1. Device for exposing the inner conductor at the end of a solid sheath coaxial cable, comprising the following features:

• - A clamping device ( 10 ) in which the cable ( 1 ) is rotatably mounted about its axis;
• - Means for axially fixing the coaxial cable;
• - One adjustable separator ( 30/40 ) for axially graded cutting of the outer or inner insulation and the outer conductor;

characterized by the following features:

• - The Einspannvorrichtug ( 10 ) is formed such that the cable is immovably fixed in the axial direction;
• - There is a holding device ( 20 ) which is designed to be movable and the A clamping device ( 10 ) holds that the clamping device ( 10 ) perpendicular to the axis of the clamped cable ( 1 ) is movable;
• - As a separating device at least one circular saw ( 30/40 ) is provided, with a saw blade ( 31/41 ), the axis of rotation of which runs parallel to the axis of the clamped cable ( 1 ) and which is arranged such that the cable ( 1 ) suitable movement of the holding device ( 20 ) hits the saw blade ( 31/41 );
• - There is a device bed ( 7 ) on which the holding device ( 20 ) and the circular saw (s) ( 30/40 ) is / are attached;
• - At least one limiting device ( 50/60 ) is provided, which is designed and arranged so that the clamping device ( 10 ) and thus the cable ( 1 ) can be adjusted to a defined minimum distance on the outer circumference of the saw blade ( 31/41 ) is.

2. Device according to claim 1, characterized in that the holding device ( 20 ) carries a depth stop ( 22 ) for the cable ( 1 ) which is attached in the axial direction of a tensioned cable ( 1 ) and is adjustable in the axial direction. 3. Device according to one of the preceding claims, characterized in that the clamping device ( 10 ) can be driven by an electric motor ( 14 ). 4. The device according to claim 3, characterized in that the electric motor ( 14 ) on the holding device ( 20 ) is fixed. 5. Device according to one of the preceding claims, characterized in that the clamping device ( 10 ) is designed as a collet device, the clamping bush ( 16 ) is biased in the closing direction by spring means ( 17 ). 6. The device according to claim 5, characterized in that the clamping bush ( 16 ) is fixed interchangeably in the pivot bearing ( 11 ) of the clamping device ( 10 ). 7. Device according to one of the preceding claims, characterized in that the holding device is designed as a lever ( 20 ) which at one end is pivotally attached via a lever bearing ( 21 ) to the device bed ( 7 ), the pivot axis of the lever bearing ( 21 ) runs parallel to the axis of rotation of the saw blade ( 31/41 ) and the clamping device ( 10 ). 8. Device according to one of the preceding claims, characterized in that the limiting device ( 50/60 ) includes adjustable stop screws ( 51/61 ), the stop screws ( 51/61 ) preferably via holder ( 52/62 ) on the device bed ( 7 ) are held in corresponding threads and come with the Haltvor device ( 20 ) in the set minimum distance in impact, or that the arrangement is reversed fen. 9. Device according to one of claims 1 to 7, characterized in that the limiting device ( 50 ) comprises an adjusting device ( 53/63 ) for the (or each) saw ( 30/40 ) which is arranged and formed in this way, that the (or each) saw ( 30/40 ) at an angle ≠ 0 ° to the direction of movement of the clamping device ( 10 ) is movable bar at the points of the minimum distance. 10. Device according to one of the preceding claims, characterized in that two saws ( 30/40 ) are seen before, the saw blades ( 31/41 ) are arranged parallel to each other. 11. The device according to claim 10, characterized in that one ( 30 ) of the saws ( 30/40 ) parallel to the axis of rotation of its saw blade ( 31 ) is slidably mounted on the device bed ( 7 ). 12. Device according to claims 7 and 10, characterized in that the bearing ( 21 ) of the lever ( 20 ) between the two saws ( 30/40 ) is arranged.