DE1944648A1 - Electrical program control unit for washing machines or dishwashers and the like. - Google Patents

Description

KIENINGER & OBERGFELL

Factory for technical drives and apparatus ST. GEORGEN SCHWARZWALD

Electric program control device for washing machines & dishwashers and the like.

The invention relates to an electrical program control device for washing machines and dishwashers and the like », with a plate-shaped program carrier through which a insulating plate arranged contacts due to a relative rotation of the program carrier to d 'isen contacts Concentric Nooken tracks arranged on the program carrier can be scanned.

Program control devices with a plate-shaped program carrier the concentric trajectories that can be scanned are already known. In the form of such a design Program control device with a plate-shaped program carrier and on this arranged laterally scannable concentric

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Tracks are the contacts in a pot-like insulating body arranged, the open side is covered by a hood-like part, with the necessary contacts in the hood-like part are arranged with its open Page the Prograv.nträgar r.büoekt. and eonit the scan made possible by its contact paths through the introduced contact parts. The individual contact parts have connection . flags on which from the surface of the insulator protrude and can be connected by means of screw and / or soldered connections.

This known program control device has the disadvantage that the type of contact carrier construction described is not a flat one Design of the program control device allowed; because of the hood-shaped Insulating body is too strong and the contact lugs protruding upwards require additional space

condition.
I.

Another known program control device has printed circuit boards which serve as carriers for the contacts and arranged next to the plate-shaped program carrier disk are. It has slots through which the radial paths of the program carrier were scanned. The connections of this program control device are designed as conductor bars, which are in the form of printed conductor tracks

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are formed and guided to the periphery of the plate.

Although this known program control device has the advantage of a relatively flat design, the actuatable ones must Contact parts attached to the board and electrically connected to the printed conductor tracks. from A further disadvantage is that with this arrangement only those contacts can be formed which, although on incidence close suddenly when actuated, but only open relatively slowly.

This “known program control device is also from Disadvantage that only relatively small currents are switched due to the limited cross-sections of the printed conductor tracks and on the other hand, the effective cross-section of the conductor tracks can be increased by tinning must, which leads to inaccuracies when actuating the contact parts can lead, if not to the switching of higher currents is passed over, which requires special wiring with the connection circuit and a considerable amount Effort means.

Furthermore, a program control device is known in which a roller-shaped program carrier of spring set-like Contacts is scanned. The spring sets exist

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BATH

here from group-like arranged contact springs, which in Plastic are injected, this overmolding having recesses through which the individual webs, which connect the contact springs to one another, can be separated. To form the spring sets, individual These overmolded units are assembled into a spring set block and built into the program control unit.

Such an arrangement of a contact carrier for a program control device However, it has the significant disadvantage that it is spatially very expansive and not a flat and space-saving one Design of the program control device allows.

The invention is based on the object of creating a program _{control device 3} which, while avoiding the above-mentioned disadvantages of the known control devices, satisfies the described requirements to a favorable extent. In particular, the aim is to create a program control device that is extremely flat and easy to manufacture.

The solution to the task at hand consists in the combination of the following features:

The actuatable contact parts acted upon by the program carrier are in groups according to the opposite

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the program carrier position to be taken from a metal plate by punching and bending, taking into account the for contact actuation necessary bias formed or shaped as contact springs.

The mating contact parts of these contact springs are in a corresponding arrangement from a second metal plate Stamping and, if necessary, bending formed.

Each of the metal plates has an arrangement of punched holes through which a conductor network that connects the individual contact parts connects with each other, is formed.

This conductor network of the metal plate ends at flag-like connection parts that lead out at the periphery of the plate and can be joined there with slip-on mating connection parts are.

Each of the metal plates is firmly connected on both sides with an insulating layer that is in the vicinity of the contact parts has the recesses.

The metal plates insulated on the sides are joined together like a row and arranged opposite the plate-shaped program carrier, so that this is duroh the actuation

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Serving springs can be scanned and when the the latter the contact between these and the respective opposite contact parts of the second plate closes or is separable.

A contact carrier arrangement according to the combination of the aforementioned features has considerable advantages. The operable contact parts are it they formed zusanen "connecting wire network of a metal plate of a geeigne P-th material by Umstanzen and bowing. This metal plate is then provided with old insulating layers on both sides, which can be done, for example, by overmolding the punched metal plate. Same procedure will carried out on the printed circuit board carrying the mating contact parts.

This is also punched out of a metal plate, the individual mating contact parts being punched through generated conductor network are connected. This plate is also provided with old insulating layers on both sides, which can also be done by overmolding the plate. the The plates are insulated in such a way that corresponding recesses remain free in the areas in which the contact parts are arranged. a Kontaktiohluß is enabled.

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The insulating layers arranged on both sides of the plates allow both electrical separation and electrical separation Stabilization of the ladder frame formed by punching from the metal plate.

After isolating the stamped metal plate, «as except by spraying z. B. can also be done by gluing insulating layers or insulating plates, are carried out at special points provided for this purpose on the Leiternetxes Pre-punching or shearing separations of individual conductor bars in order to adapt the insulated circuit board to the circuit conditions of the program control device concerned. This makes it possible to use a single Orundtype of such a circuit board by subsequently separating individual ones Bars to meet a variety of applications. The conductor network becomes the result of the insulation on both sides mechanically stabilized even when individual webs are completely severed.

Both insulated panels, i.e. H. the one carrying the actuatable contact parts and the one providing the mating contact, are put together in layers and arranged directly opposite the Jioekenbabnen of the plate-like program carrier plate, the extensions of the actuatable contact parts the radial Nookenbahnen des

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Scan the program carrier.,

The described arrangement of the contact carrier enables an extremely flat structure of the entire setter device range.

In the accompanying drawing documents, the invention is explained in detail, "W, in which:

Fig. 1 is a side view of a program control device

with the contact arrangement according to the invention, Fig. 2 is a plan view of a program control device with the

contact arrangement according to the invention, Fig. 3 shows a development of the contact arrangement according to the

Invention, Fig. 4 shows another development of the contact arrangement according to

of the invention c

In Fig. 1, 1 represents the program control wave associated with the

Plate-like program carrier 2 is positively connected. The program control shaft ί is in bearings 3 and 4 of the housing parts 6 that form the housing of the program control device 5 and 7 stored. These housing parts are expediently manufactured in a manner known per se as sheet metal parts, which is a poor design with sufficient strength

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of the housing.

On both sides of program carrier 2 are the isolated Metal plates 8 - 11 arranged «Each of these plates wears a Conductor network that is cut out of the actual metal plates 12-15 by punching.

FIG. 2 shows the configuration of the insulated metal plate 8 or the stamped metal plate embedded in it 12 can be seen.

From the plate 12 are contact springs ^ 16 in four each u » Groups that are offset by 90 ° from one another are formed by instances, and as can be seen from FIG. 1, shaped by appropriate bending. By punching out? 7 in the plate 12 webs 18, 19 and 20 are formed over which the individual Contact springs 16 side by side and the conductor network are connected.

The individual groups of the contact springs 16 are connected to the ankle lugs 29 via longitudinal webs 21 - 28.

From Fig. 2 it can be seen that by separating the webs 17 »18 and 20! ■ Ladder net, some of the springs 16 across the · LMngsstege 21 - 28 brought up to the AnsohluQfahnen 29 and deaoaoh can be electrically connected separately.

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This on separating different webs i? - 20 takes place, after the metal plates 12 - 15 either through-encapsulation or by covering with insulating foil or plates, in addition to the electrical insulation, an additional mechanical element Have received stabilization, and thus preserved the stability of the plate even if individual webs were separated remain. To undertake the separation of the webs of the conductor network, it is expedient to have at least one side in the vicinity thereof the insulation removed or omitted from the insulated metal plate. This makes the process of separation mechanical relieved.

The separation of these webs takes place according to the selected circuit arrangement, depending on the number of pieces to be manufactured Devices, either individually or together in a specially provided for the device in question Tool.

There is now an insulated metal plate 8, 10, which carries actuatable contact parts 16, 38, with a second insulated metal plate 9, 11, which has non-actuatable contact parts 33, arranged opposite the program carrier 2 in a sole-like arrangement.

Aue dar Fig. 1 it can be seen that the non-actuatable

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-I-

Contact parts 33 supporting insulated metal plate 9 between which the actuatable contact parts 16 carrying metal plate 8 and the program carrier 2 is arranged and that the non-actuatable Contact parts 33 than opposite the free end of the actuatable contact springs 16 in an opening 42 of the they are formed supporting insulated metal plate 9 arranged fixed contact pieces 33.

In FIG. 1, the special embodiment of an actuated Contact spring ± 6 can be seen. The contact spring carries at its front end a plastic by injection molding on the Spring-mounted actuating lug 30, which through an opening 42 in the insulated metal plate 9 in the radial paths 31 engages and is acted upon there during the movement of the program carrier 2.

Already when the springs 16 are punched out and shaped, they are expediently given the preload necessary for actuating the contacts, so that the springs 16 do not need to be adjusted. The length of the contact spring l6 is bent approximately into the plane of the insulated metal plate 9 assigned to it at the point 32 and, if it is not acted upon by the program carrier 2, makes contact with the fixed contact part 33 of the insulated metal plate 9 by means of the prestress assigned to it.

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This arrangement of the contact spring 16 is extremely flat design of the contact arrangement, since even when the actuated springs i6 are acted on, these isolate the Metal plate 8 hardly protrudes and for this reason between insulated metal plate 8 or its actuated Contact springs 16 and the housing part 6 only maintain the outermost distance given by the association regulations is.

The formation of the conductor network enables the design of circuits for automatically controlled household appliances the most diverse requests are taken into account, as different conductor routing on the contact carrier of the program control device can be taken into account through different separation measures on the webs.

There is no need for separate wiring because all the wiring is on the contact carrier of the program control unit can be detected by the conductor network, taking into account that a considerable proportion of the contact points is not to be led to the outside to the terminal strip of the program control device, but through the internal conductor routing of the device is taken into account.

The planned training for "! Απ takt carrier thus saves

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any wiring work that previously required a significant amount of manpower, working time in production and costs. In addition, the advantage is achieved that incorrect wiring can no longer occur because those to be carried out for a specific program control device Separations in the conductor network of the contact carrier can be carried out using appropriate tools and thus a Consideration of individual features of the cable routing, as is usual for wiring work in and of itself, is omitted.

It is known that the Kontaktfodern that the plate-shaped Scan program carriers, preferably by 90 to each other to arrange staggered groups.

In the case of the present inventive arrangement, however, this group-like arrangement has the unforeseeable one Advantage, a very favorable design of the loiter network to allow and, above all, to enable an appropriate arrangement of the ladder bars.

According to an expedient development of the invention a connecting claw 32 is provided behind each contact spring 16. This connecting claw consists of a cutout, which has two outwardly curved trapezoidal tabs 33.

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This connecting claw offers the possibility of the insulated metal plates 8, 9 and iö, Ii by pushing in or pushing in of slats 3 ^ electrically closed at certain points connect, the prerequisite here is that on each of the two plates to be connected such a connecting claw 32 is opposite is arranged and the conductor networks of both plates through the lamella pushed into the two connecting claws can be connected to each other. These connecting claws are both behind the individual actuatable contact springs as well as within the rest of the conductor network at suitable locations.

For the detailed design of the actuatable contact springs 16, it should be noted that they are insulated along their length by the plate insulation up to the edge 35. To maintain the appropriate spacing, the conductor network is set back around the formed springs 16 within the insulation, as can be seen from the dashed lines 36. By: -. "> D * ^e i are webs 37 formed on the insulation, and with particular advantage with this in Kun3tstoff spraying method can be made to ensure the necessary Ιεο-lationsverhältnisse se .6 between the individual contact springs?.

The webs 37 therefore separate the individual contact springs 16

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electrically from each other and provide a set of ports bridging the spaces between the individual contact parts the insulation on both sides of the metal plate.

Both insulations along the edge 36 are expedient the circuit board connected to each other so that the edge of the circuit board is enclosed by the insulation.

To switch very strong currents, it is necessary to separate the contact point for waste. In addition, higher voltages according to the relevant regulations so large air gaps between the contacts are necessary, that this through the contact arrangement shown in Fig. 1 rait the spring contact l6 no longer or only can be carried out to a limited extent.

According to an expedient development of the invention, there is therefore a different one from the underside of the program carrier 2 acted upon contact device shown in Fig. 1, the operated contact spring 38 being formed in the insulated metal plate 10. The contact spring 38, the aci front end has an actuating nose, is designed as a spring straight along its length, which when acted upon by the program carrier with the her associated fixed contact 39 causes the contact by bending out, but in the case of waste via a step of her associated radial path of the program carrier 2 a causes momentary opening of the heavy-duty contact.

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In fig. 1 it is shown that the insulation 40 of the plague contact 39 protrudes from the plane of the insulated metal plate 11 is bent out into a plane parallel to this, is adapted to the curve of the spring 39, Such a shaping of the insulation has the advantage that the rigidity of the spring 39 increases and the structure of the Contact device is stabilized.

fc All parts used to make contact (spring contacts 16, 38, 39, and fixed contact 33) point to the contact forming. Set up contact pads made of suitable materials, which can be applied in a manner known per se by riveting, welding, soldering or another method.

According to a further expedient inventive development it is provided in FIG. 1 that the rear end of the contact spring 38 is designed as a bent lug 41 which protrudes downward and is gripped by a connecting claw) of the insulated metal plate 11. Such an embodiment of the connection of a contact spring is useful, for example, when the longitudinal webs of the plate 10 leading to the connection lug 29 are all occupied and for this reason the contact spring 38 cannot be guided directly to the connection lug 29. This difficulty is unigangen that the contact spring via its bent end 41 and the connecting claw 32

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is guided into the conductor network of the insulated metal plate 11 and connected via this to the terminal lug field PS assigned to it.

The contact device shown in Fig. 1, formed by the insulated metal plates 8 and 9, which ia essential from the contact springs 16 and the fixed contact 33 is made possible under normal contact load conditions a spatially very flat design of the contact carrier,

The one shown in the same figure, from the isolated Contact plates 10 and 11, consisting of the springs 39 and 39, supported by the contact arrangement, permit a relatively high degree of stability flat design of the contact carrier and enables switching very high currents with corresponding Ii; h <m! Tensions,

Ks is, basically similarly, both contact devices -'Uli ¹ one and the same contact carrier, which consists of the two f sol i er ton metal platon > i and 9 or K) and II, in the gate /, transferring. This is particularly beneficial if the i) oha 11 processes occurring during the program to be carried out due to the present Dcilai environment and tensions - in which case it might be dead through d in ninl achen Koufict 16, '53 'nnon and

just some won i go Scha L tvor; ^r , ängo r.'oron ruucirialo Ilolaatung .'jchroi ton.

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The somewhat greater thickness of the contact carrier, which is due to the use of the contact device formed by the contact springs 38 and 39, allows a satisfactory reduction in their dimensions compared to the known devices and thus the design of flat program control devices, especially if both contact devices have external wiring practically omitted. The ψ contact arrangement formed from the contact springs is expediently provided on only one side of the tab field on the dome contact carrier.

An expedient further development of the concept of the invention is based on a mutual contact arrangement (For example, plates 8,9) both the contacts for the program control device and those for the Additional program selection switchgear. this will realized in that the two insulated metal plates

8.9 at least on one side of the program control device > ·

up to the range of the next to the program expensive device arranged Vahlschalters extend in itself well-known l / eiao as a switching element also a Toller disc which acts upon contact springs arranged in corresponding groups. On the two isolated metal plates So the boidon contact arrangements are one above the other applied, the spring contacts and the fixed contacts in the manner described for both switching devices Jo a plate arrangement are ruuigostnzt.

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Another possibility is generally within the scope of the invention in it, also the reversing switch with a flat table top to provide and assign it to groups of contacts and train them as a switch, with its contacts also be punched out of isolated and layered metal plates.

Also a combination of program control devices and a reversing switch with the program selector switch on the Conductor network of a plate arrangement represents a very favorable development of the basic concept of the invention.

In Fig. 3 the arrangement of a program control device is shown schematically, in which the contacts 16 offset from one another by 90 and the contacts 43 of an associated reversing switch are arranged in two groups next to one another. Both switches are encompassed by a common contact carrier arrangement, which consists of two insulated metal plates 8, 9 arranged in layers, from which the contacts and mating contacts are formed. It is useful here to put the actuatable contacts 43 arranged next to one another in groups in their carrier plate 8, 9 at the same potential or to lead them to a common web, and, if necessary, to place the mating contacts on separate webs of the conductor network. This arrangement can be realized with little effort, since the actuatable springs 43 of the

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isolated metal plate 8 can be formed from this and can remain connected to one another via this.

FIG. K apparently shows the combination of the contacts 16, 43 for the program carrier 2 and the reverser hk of the program control device on the one hand and the indexing plate 45 of the program selector switch on the other.

In particular, from the schematic representation of Fig. K it can be seen that in a further development of the basic arrangement of the invention set out in Figs can be combined and here the separate arrangement of contacts as well as their special wiring, as was previously the case with the well-known program control devices, can be omitted. This gives a considerable spatial advantage, because the combined switching units can be made very flat due to the favorable arrangement of their contact carrier, and a considerable reduction in price is guaranteed, since the work involved in carrying out the wiring from one switching unit to the other is eliminated. At the same time, any grounding errors can be prevented because the formation of the conductor network is determined by the tools available and thus subjective errors

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are prevented during the design of the conductor network.

Instead of the reversing arrangement, the program control unit can use a conductor network an Itapulkontakt can also be provided, which is used to intermittently trigger switching measures and, if necessary, can also be combined with the reversing holding device and contact arrangement.

According to a further expedient development of the inventive concept, as can be seen from FIG. 2, connecting claws 3? ^{1 is} provided, by means of which, if necessary, a pre-connection can also be established between the isolated metal plates or contact carrier systems arranged on both sides of the program carrier. For this purpose, the contact carrier unit 8,9 is connected to the unit 10, 11 by a correspondingly longer lamella 3 ^ or by a pin, if this should be expedient or necessary for reasons of circuit technology.

In Fig.: -; connection terminals J2 ^f are shown, which are arranged in the insulated metal plate 8 located on the outside (above). Such claws can also be provided at the same point on the plate 9 lying on the rl / irun gate, the pre-binding of the insulated Mo LuI plates lying directly on top of one another as well as the connection on the ontgogongoBotzton Unite

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SAD ORtGINAt

Insulated metal plates attached to the program carrier 10 and 11 can serve.

To prevent a connection of the conductor networks either the insulated metal plate 8 or 9 or 10 or 11 with one of the on the opposite side the program carrier 2 attached Lciternetzordnunggn,

by the pressed in or indented lamella 3 ^, accidentally Conductor network arrangements on one side of the Programra-P carrier are connected to each other, if necessary trapezoidal tabs 33 in the plates with which no Connection to be made can be removed by shearing or punching.

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Claims (1)

/ l) ! Electric program control device for washing machines and dishwashers with a plate-shaped program carrier rotatably mounted around its axis, which scans contact parts arranged on flat, fixed plates, characterized by the combination of the following individual features: I. The rotatably arranged program carrier (2) is assigned to a set of spring contacts (16) in such a way that they are continuously scanned by them can. II. The spring contacts (16) are punched out of a metal plate made of spring material so that that they are connected in groups at their rear ends, for example in groups of preferably two, three or four spring contacts . III. The corresponding fixed contacts (39) are also punched out of a second metal plate. 109811/1009 IV. The metal plates (8-11) are superficially on both sides isolated and layered on top of each other. V. Each metal plate has cutouts (17), through which a conductor network (18-2H) is formed, the the individual contacts (16, 33, 38, 39) connects to one another, in such a way that this conductor network the metal plates (12-15) on flag-like connection " divide (29) the plates (12-15) ends on the Connection parts can be plugged on. 2) Prograiaiasteuergerät according to claim 1, characterized characterized in that the fixed contacts (33) supporting insulated metal plate (9) and the The insulated metal plate (8) carrying spring contacts (l6) and the program carrier (2) are arranged in such a way that at the point at which the scanning of the program carrier (2) goes through the contact springs (l6), this is penetrated by them. 3) Prograoa control device according to one of claims 1 - 2, characterized in that the fixed contacts (33) aa free end of the spring contacts (l6) are arranged in an opening (42) of the insulated metal plate (9) carrying them. 10981 1/1009 k) Progracin control device according to one of claims 1-3, characterized in that the spring contacts (16) ait their actable ends, the outermost part of which carries a contact pad, bent approximately into the plane of the insulated metal plate (9) carrying the fixed contact pieces (33) and have an injection-molded plastic nose (30). ■ 5) program control device according to one of claims 1-4, characterized in that the the spring contacts (38), which can be used for switching high electrical powers, are carrying isolated metal plate (10) between the plate-shaped program carrier (2) and the fixed contacts (39) insulated metal plate (ll) is arranged that the spring contacts (38) are straight and an injection molded plastic nose (30). 6) program control device according to one of claims 1-51 characterized in that, in addition to or instead of fixed contacts, contact springs are also used (39) are provided, which out of the insulated metal plate (ll) carrying them into a zua spring contact (38) parallel plane are curved. 109811/1009 7) program control device according to any one of claims 1-6, characterized in that the the spring contacts (l6) carrying the insulated metal plate (8) are also assigned fixed contacts (39) which together with an insulated metal plate (9) carrying fixed contacts (33) and made of continuous, actuatable contact springs (38) are used to handle switching operations with high switching capacities that occur in the program sequence. 8) program control device according to one of claims 1-7, characterized in that on spring contacts and fixed contacts are provided on the metal plates on both sides of the program carrier (2), wherein the program carrier (2) can be scanned on both sides, has concentric orbits. 9) Program control device according to one of claims 1-8, characterized in that the insulating layers of the metal plates (8-11) in the area between the individual contact parts (l6,33; 38j39) serve to isolate these parts, both insulating layers of the metal plates ( 8-11) have comprehensive webs (37) and the conductor tracks (20, 21, 22) of the conductor network (36) arranged directly next to the contact parts are set back in the vicinity of these contact parts and from the two at this point 10 9 8 1 1/100 9 interconnected, on both sides of the metal plates (8-11) arranged insulating layers are enclosed. 10) program control device according to one of claims 1 - 9, characterized in that the metal plates (8,9; 10,11) on their outer edges in the area their connection or bracket with the housing (5) of the program control device from there with each other connected double-sided insulating layers of the metal plates are enclosed and that the insulation in the Area of the connection lugs leading to the outside (29) protrudes from the housing (5) and the connecting lugs are required for mutual isolation of the same Have length. 11) program control device according to one of claims 1 - 10, characterized in that part of the webs of the conductor network of the two metal plates (8-11) has claw-like punchings (31) at opposite points, with such a design, that by pushing in or pressing in connecting parts (pins, lamellas, tabs, etc., in this, conductor tracks of a metal plate (8,10) with those of the other metal plate (9,11) as required are connectable and that through in the area outside 109811/1009 6AO ORIGINAL the program carrier (2) provided ^{punch-outs (32 r} ) of this type, also contact carriers, which are arranged on both sides of the program carrier (?,) , can be connected (8,9; 10,11). 12, program control device according to claims 1-11, marked by the fact that in the opposite punchings (31) of individual metal plates (8-11), with which through the pressed or inserted connecting parts (3 * 0 no electrical Connection is to be achieved, the trapezoidal tabs (33) causing this connection are detachable. 13. Programn control device according to claims 1-12, characterized in that on the metal plates (8,9) in addition to the contact parts (16,33) for the actual program control unit and the contact parts (^ 3) for the reversing switching device are provided, which of the Reversing program carriers (kk) also designed as a plate-shaped indexing disc with radially arranged scannable paths can be acted upon. 10981 1/1009 8AD ORIGINAL 14. Program control device according to claims 1-13, characterized in that on the metal plates (8,9) the contact parts (16,33) are provided for a further program carrier (45) which also nls plate-shaped switching disc with scannable radial paths is formed and represents the switching element for the Prograonselection switch, and that the contact elements (16, 33) of the program selector switch, if necessary, with the contacts of the progranin switchgear are connected via the conductor network of the metal plates (8,9) and, if necessary, via this are led to further terminal lugs (29). 15. Program control device according to claims 1-14, characterized in that the insulation of the metrill plates (10) have openings have, from which 90 ° bent lugs (41) of the conductor network protrude, which "it" separating claws (32) dor other metal plate (ll) are connected. 16. Progratnnsteuergerftt according to one of claims 1-15, characterized in that the formation or formation of the contact parts (16,33,38,39) from the motall plates (12,13,14,15) and the Formation of the Leitornotzos by punching and, if necessary Bending takes place. 109811/1009 GAS 17. Prograrmnsteuergerät according to any one of claims 1-16, characterized in that in the metal plates provided with an insulation
(8-11) individual webs (18-20, 21-28) of the conductor network, depending on the desired circuit arrangement, can be separated by punching or shearing. 18. program control device according to one of claims 1 - 17 _t W, characterized in that to facilitate the separation of these webs (18-20, P1-28) in the area of the same recesses in the insulation of the insulated metal plate (8-11) are provided through which the separation of the webs
is feasible.