DE2028849A1 - Method for producing a casing for the coil core of a relay - Google Patents

Description

202 W49

8156-69 / H

DB 191

Italian PA 19 172 A / 69

from 4.7.1969

Societä Italiana Telecomunioazioni Siemens s «p.a. Milan, Γ al: * a

Method for producing a casing for the coil core of a relay.

The invention relates to a method for producing a casing for the coil core of an Eelais from a Tape made of insulating material, preferably made of plastic material.

The invention also relates to a bobbin with a casing produced by this method.

It is well known that the coil of a heater must be isolated from ground and thus also from the metallic coil core. For this purpose it is known to place intermediate layers of insulating material by hand between the core and the coil in various work steps. In most cases, the envelope is produced by first forming a Str k tape is wound with sharp-like cut HChange on the spool core and then fixed with a Hetoestreifen, which prevents the tape unwinds · Because of the cut strips, the insulating tape can be well adapted to the form adjust the core so that unwanted bulges

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'genes to be avoided that could arise if that Electrical tape compared with the free one to be wrapped The length of the core is so broad »with the incised • Ribbons are also a © clothing "that goes through the kernobar surface and the flanges of the spool formed corners possible »For ai © s © work steps a total of about 15 to 20 seconds is needed. The coil formers isolated according to the known method However, they have major downsides «For example

"If the edges of the insulating tape are tied to the edges, there is a fold that there is an electrical discharge (flashover) through the notches between the coil and the bobbin," An attempt has been made "to reduce the risk of such a flashover that the cut insulating tape is wound around two and a half turns on the core, the possibility of a flashover and the resulting complete destruction of the relay are not reliably prevented to wrap, which takes quite a long time; " Finally, during the winding process, the insulating tape has to be pressed against the core by hand so that wipd ₉ prevents the tape from rolling up again or being wound up poorly.

According to another known ¥ learned the envelope is made dadurck that an insulating cord on the. Wound core and subsequently impregnated with insulating wlsde bite f®rfaiu? But has @a & ®n MASH part that the insulating layer is too thick ₉ when at each parking «« ine eiawsadiraio insulation guarantees should ·

The object of the invention is primarily to provide a method by which the casing of the coil core much faster and therefore more economical is possible than before, whereby the wrapping can be carried out completely automatically or by hand »

According to the invention, the insulating tape is first cut off and then curled up. The bone so formed is pushed into a cylindrical cavity and heated. Finally, it can be countersunk at one or both ends will. All operations are carried out automatically according to a defined sequence «

A casing produced according to this process can be placed on the coil core in a very short time, about one second be applied. It is not necessary to attach the electrical tape with adhesive tape. the geometric and also the electrical properties of the coil are improved because there are no differences in the thickness of the insulating layer along the individual generatrix caused by the adhesive strip a.

The one produced by the method according to the invention Sheath is an insulating tube, the jacket edges of which are not welded, but wound freely and elastically on top of each other, so that its diameter is in one wide range can change. This elasticity enables the insulating tube to be attached to the coil core facilitated and a tight fit is guaranteed without the use of additional fasteners

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According to a preferred embodiment, the insulating tube produced in the manner described has one in the form of a flange-like (funnel) countersunk end on the one hand this recess serving as a mouth facilitates the automatic application of the tube to the core on the other hand the insulating with the countersunk end lightly pressed against one of the two planes of the bobbin · The other end of the Eöhrchens, however, can be used in a recess P, which is expediently provided in the bore of the other flange · This prevents one turns of the relay coil at the core ends at the level of the flanges under the insulating cover reach·

The elimination of the adhesive strip results in a material saving and, as already mentioned, a more even one Thickness of the insulating layer J. along the generatrix of the isolated cylindrical surface is reached. In the known methods, a difference in dioke is practically unavoidable, in one case because of the adhesive strip and in the other case as a result of an uneven distribution of the turns of the insulating cord · It is easy to see that the invention also enables the electrical Properties of the relay coil, e.g. that of the same » the degree of winding and the number of turns Resistance values that are closely related to the geometric properties are essential will·

Whomi according to a preferred Amsführungfo]! » the tube only has an outer catch at one end

■ - 5 -

while the other end in one in the one splash provided recess is inserted, this has the advantage that the area of this flange in the The vicinity of the coil core remains free of insulating material · This prevents the wire from churning the winding provided guide grooves for the beginning and the end of the winding will not be disturbed. Grooved paddles can therefore be used * as required when using fully automatic winding machines

According to a second embodiment, the insulating tube produced according to the invention does not have any its ends have a countersink · Both point in this pail Splash the bobbin in its bore with a depression or recess into which the two ends of the tube · According to a third embodiment, however, both ends of the Insulating tube can be provided with a countersink.

In all three execution forms, compared to the stand The technology achieves a much better insulation against the coil core, i.e. against ground, regardless of this every possibility of contact between coil and ground is eliminated, even in the most unfavorable Pail of a faulty assembly, as both the outwardly widening indentations on the insulating tube as well as the efcisenkungen at the facing holes prevent individual coil turns from touching the coil core

In addition, the invention significantly reduces the cost of assembling the coil. To apply

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the insulating sheath on the coil core, it is only necessary to put the insulating tube on the To push the core, which only takes about a second

The invention will now be explained in more detail with the aid of the drawing it will show:

fig «1 a thematic representation for explanation the method of manufacturing the insulating tube;

Pig · 2 in an exploded perspective view the bobbin of a helicopter with the insulating Sheath and the two flanges j and

Pig 3 a longitudinal section through a relay equipped with a coil

In Pig · 1, 1 denotes a roll of insulating tape used to coat the coil core or * to produce the casing · The insulating tape 2 is cut by scissors 3, which are adjusted _{9 so} that each piece of tape 4 of the same length is created · In the course of the manufacturing process if each BaaäatückA ₉ after it has been cut ₈ through a rectangular gap 5 into the cavity 6 of a cylinder "7 ®iag @ I®gt _e bin cylindrical pin 9o the @ia" m SAlits 8 has, so enters

that the edge of the dureii a®m gap 5 -i »äem penetrated base

After the Zapfea 9 selm® SlugiböwegpaBg in has finished® turns;

Cavity of the cylinder 7. ! subsided «! will the Pin 9 pulled out of the hollow space 6 and the piece of tape 4, which has now become "inta ear", remains in the hollow space until the next machining process. This Röhrchan 10 is then aua by a pin 11 The cavity of the cylinder 7 is ejected and enters the bore 12 of a cylindrical shape 14 at the same time. To facilitate the sea process The shape 14 has a recess 13 through which a Knocking and rolling up the tube * is avoided. Dia form 14 is now heated in such a way that the tube 10 permanently assumes the desired shape with a countersink 19 in the form of a funnel-like flange a

This depression 19 is molded into the tube at the end of the tube, which is heated for this purpose, by a punch 18, with a guide core 16, the punch 18 is pressed against the mold 14 so that the guide core enters the bore and that Holding tube 10. Bin conical hawks 17 of the Stempele suppressed gagem dia lens kung 13 aufweiat a ent · * speaking profile, whereby the gewünaohte counterbore is formed · Bas finished Isolierröhrohen 1O ₉ at its one Xnda at 19, but not at its other BnAa 20 "ine Has recess is shown in Fig. 1 on the far right.

Fig. 2 shows the entire bobbin, consisting of the bobbin, in the säsaimaadargesauger bar position its insulating »covering and the balden flanges. During the Zuiameeabaue the core 27 is pushed through the bore 26 a Jeelierflausches 25, which then

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is pressed against the head 28 of the core becomes the countersunk end of the insulating tube at 19 pressed lightly against the flange 25 · As the tube has been manufactured with an inner diameter which remains smaller than the outer diameter of the coil core ^ it is tightly wound onto the core. Finally, the end 20 of the tube, which is not provided with a counterbore, is inserted into a countersink 21 of the bore 22 of the other insulating flange 25 of the bobbin, which is on a knurled part 30 of the bobbin 27 is pressed on As can be seen from FIG. 3, this gives an insulating covering which prevents individual Turns of the coil near the flanges come under the insulating layer · In Fig · 2 are also for the winding wire provided guide grooves 24 shown «the are cut into the flange 23 for the use of a fully automatic winding machine «

The invention is of course not limited to the illustrated embodiment. For example, if For design reasons, both flanges of the coil body β should be very thin and not an automatic one Winding machine. Is used, it would be useful instead The grooved flange 23 has a flange 25 similar to use another flange. The insulating tube would then be provided with a depression at both ends, as shown at 19. For the production of such a Xeolier pipe clamp must © the above toes @ Siri © b © a © Procedure can be modified as follows: Instead of the single stamp 1Θ comes at each end of the form 14 a stamp for use in the form 14 has both Ends of their bore a © countersink according to d @ a |

/ 11

Stamping on ο The mold is made up of two semi-cylindrical halves _t separated from each other; can be so that the finished Isolierrohrohen can be removed.

However, if for certain reasons both flanges of the Coil body, to correspond to the flange 23, the insulating tube is made without countersinking .. The required modification of the described verse. driving goes without saying

$ 109809 / $ 175

Claims (1)

Method for producing a casing for the Coil core of a relay made from a strip of an insulating material, characterized in that the The piece of tape (4) to be wound on the spool core is initially rolled up in a hollow cylinder (7), then inserted into the cylindrical cavity of a mold (14) and then in this way is heated so that it retains its curled shape after removal from the mold Method according to Claim 1, characterized in that for the permanent shaping of the rolled-up Bandstücks- a form (14) is used, the A cavity in its cylindrical surface at at least one end. Has depression (13), through which the piece of tape is provided with a corresponding permanent recess (19) will, and that to train this sinking a Stamp (18) is used, which has a guide core (16) and one of the recess (13) corresponding conical, feil (1?) possesses. Coil body with a back cover and an insulating film ₉ data »!. that curled up 'flanacJatirtlgeii
is applied (Fig * 5 © 4, bobbin bit ce- t «that 111)! nis mounted insulating flange, characterized in that the rolled up piece of tape (10) is inserted with one end (20) into a recess (21) provided in the bore of the insulating flange (23) (Fig. 3% left) 109809/1759 Blank page