TECHNICAL FIELD

.The present invention relates to a contact arrangement on a card having on a surface printed circuits or printed wiring.

DESCRIPTION OF THE PRIOR ART

Contact arrangements suitable for use in conjunction with cards with printed wiring are previously disclosed. Thus, for example, use may be made of sprung organs which are forced down manually «against the parts of the circuits concerned and into contact with them in such a way as to establish a contact. When the manual force ceases to be applied, the aforementioned contact will also cease. Also previously disclosed is the arrangement of switching organs which, subject to the application of force, will present the aforementioned sprung organs for the purpose of the establishment of the aforementioned contact and/or for interrupting the contact. Also proposed is the use on the contact card concerned of groups of springs with contact springs.

DESCRIPTION OF THE PRESENT INVENTION TECHNICAL PROBLEM

There exists a need in conjunction with contact arrangements of this kind to be able to produce these with small dimensions and with accurate and well defined positions for the contact events

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in question. It is also desirable for the contact arrangement to be so executed as to provide the contact interaction directly on the pattern card.

There also exists a need for the contact arrangement in question to be capable of being executed in such a way that small frictional losses and thus a minor tendency to wear will occur during the application of the forces for establishing contact.

SOLUTION

The present invention has as its principal object the presentation of an arrangement which will solve the problem outlined in the above. What may principally be regarded as being characteristic of the novel contact arrangement is that one or more contact rollers are so arranged as to be capable of movement relative to the aforementioned surface in such a way that each roller is capable of interacting with the circuits so as. to close, switch and/or interrupt,, depending on the positional displacements, the contact, between parts of the circuit.

In a preferred embodiment each roller is executed with two roller contact paths which are connected together by means of an axle—shaped part. Preferably each roller contact path is allocated its own printed line on the contact surface.

In a preferred embodiment each contact roller is also so arranged as to be capable of movement along a straight path over the card surface in question. Preferably each roller contact path is allocated a printed line including a straight part which coincides with the straight path of the roller contact path. Each printed line can be so executed as to exhibit an angled section near its own straight part. Similarly each straight part can be provided with one or more interruption sections. Furthermore one or more straight parts can start .and/or end at different distances from one of the edges of the card, and different straight parts which

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belong to different circuits can form part of one and the same path.

Each line on the card is connected to an external line, whilst the contact—establishing, contact—switching and/or contact— nterrupting roller should preferably not be connected to any external line.

In a preferred embodiment the contact roller or the contact rollers is/are mounted on a slide so arranged that the contact rollers are caused to interact with the aforementioned circuits by the application of pressure. The slide can in this case be arranged inside a slide housing which is provided with a part extending over the surface of the card. The slide in this case has an organ capable of interacting with the under surface of the aforementioned part which applies the aforementioned pressure.

ADVANTAGES The use of the novel contact arrangement enables its contact roller or contact rollers to be moved over the printed circuits on a card. One and the same contact roller can be used in this case in order to close and interrupt a line without itself requiring to be connected to a specific line. The contact roller also differs from the previously disclosed contact rollers in that it rolls against the contact surface or the aforementioned printed circuits.

The novel contact arrangement can replace the previously disclosed groups of springs with contact springs. The actual switching operation takes place by the contact rollers functioning as contacts. The contact rollers act directly upon the printed circuits, and the pattern of the latter determines the switching events.

DESCRIPTION OF THE DRAWINGS

A preferred embodiment of a contact arrangement exhibiting the significant characteristic features of the invention is described below with simultaneous reference to the accompanying drawing, in which:

Figure 1 shows the contact arrangement in longitudinal section; Figure 2 shows the contact arrangement in accordance with

Figure 1 in horizontal section; Figure 3 shows the printed wiring on a card; Figure 4 shows the construction of a contact roller; and Figure 5 shows the bearing for the contact roller in accordance with Figure 4.

DESCRIPTION OF THE PREFERRED EMBODIMENT In Figures 1 and 2 a card with printed wiring or printed circuits is indicated by the reference designation 1 . The card can be of a previously disclosed kind in which the printed circuits are arranged in a manner specific to the invention. The novel contact arrangement is indicated by the reference designation 2 and is 'applied to the first side 1a of the card. The contact arrangement comprises a housing with a cover part 3 which extends above the aforementioned side. 1a of the card, towards which the under surface 3a of the roof part faces. The slide—shaped component 4 should preferably be capable of movement along a straight path, and the directions of movement are indicated by arrows 5 .

The slide—shaped component has one or more contact rollers, there being three contact rollers 6, 7 and 8 in the embodiment shown here. The contact rollers are freely supported in bearings on the slide 4 and are so arranged as to cause contact events as the slide 4 is displaced across the surface 1a of the card.

The construction of each contact roller and the nature of its support in the bearings are shown in the Figures 4 and 5. Each contact roller exhibits two roller contact paths 9 and 10 which are intended, as the contact roller rolls over the surface of the card, to interact with the printed wiring on the surface of the card. The aforementioned roller contact paths 9 and 10 are connected via an axle—shaped component 11 . The aforementioned axle—shaped component also constitutes a bearing component in the

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housing, which is thus provided with a downward—facing, disc—shaped component 12 which is so executed as to exhibit a hole 13 for the axle component. The disc—shaped component 12 may exhibit an extended contact surface with the axle—shaped component, that is to say the disc 12 in Figure 5 is extended in the plane which runs at right angles to the plane of the paper in Figure 5.

The slide 4 is also provided with transcurrent holes 14, 15 in which the aforementioned roller contact paths 9 and 10 are capable of rotating.

The slide 4 also provides support for a pressure roller 16 which is held under spring bias against the under surface 3a of the housing part 3 . The spring bias is achieved with the help of spring organs 17, 18 which are supported via their first ends 17a in the slide and are supported via their other ends 17b in the roller 16 . The spring elements 17 and 18 may alternatively be- exe.cuted" in the form of a single spring which extends through the roller 16 at its central parts and is supported in the slide 4 at its outer ends. The spring consists of a piano wire which is pre—tensioned. The spring element or the spring elements is/are so arranged in this case that the contact rollers are forced, as the slide moves across the surface 1a of the card, against the printed wiring on the card, which is represented in this case by means of printed lines 19, 20, 21, 22, 23, 24, 25 and 26 . The component 3 is provided with a curved, lower outer part 3a ¹ so arranged as to ensure that a varying pressure is applied by the rollers against the printed wiring or the surface 1a of the card as the slide moves over the surface 1a. of the card.

The slide exhibits lateral guide organs 4a which run against an edge 3b in the housing 3 . The slide exhibits four such guide organs which are positioned preferably at the four corners of the slide. The slide in the case illustrated here is so executed as to exhibit a four—sided, for example rectangular or square, horizontal cross section, on one side of which is arranged a projecting shaft

4b . The aforementioned slide may be capable of manual or automatic operation either directly or indirectly by means of actuating organs not shown in greater detail here.

The different contact rollers are not connected to any external 5 lines, but preferably serve purely as contact partners for the closing, interruption and/or switching of contact events on the card. The aforementioned printed lines 9—26 , on the other hand, are capable of connection to external organs, for example lines, via connection components 19a, 20a , etc.

0 The aforementioned printed lines are allocated in pairs to the contact rollers 6, 7 and 8 . Thus the lines 20 and 21 are allocated to the contact roller 7 , the lines 22 and 23 are allocated to the contact roller 8 , and the lines 24 and 25 are allocated to the- contact roller 6 . The lines 19 and 26 are also 5 so arranged in this case as to form together with the components .19b ^" and 26a pairs with corresponding components on the lines 21 and 24 . The aforement oned components 19b and -26a are arranged along the same straight track as components of the lines 20 and 25 . Interruption sections 27 and 28 separate the lines ^" 0 19 and 26 from the lines 20 and 25 . The lines 21 and 24 are also executed with angled sections 21a and 24a . The lines are thus of different lengths, and end and start at different distances from the edge 1b of the card. Thus, for example, the lines 22 and 23 start after the angled sections 21a and 24a measured from 5 the edge 1b of the card. The lines exhibit on the one hand straight sections which follow the paths along which the roller contact paths 9 and 10 on the contact rollers are caused to be displaced. The lines also include sections which deviate from the aforementioned displacement path for the slide. The sections 20 b, 20c can be 0 mentioned as being typical of such sections.

Upon the displacement of the slide 4 from the position in accordance with Figure 1, the following contact events will occur in the typical embodiment illustrated here. In the initial position

the roller 6 will make contact between the lines 24 and 26 , and the roller 7 will make contact between the lines 19 and 21 . The roller 8 in this case is not in contact with any line at all. Upon being displaced in the direction of the arrow 29 the rollers 6 and 7 will, after having moved across the aforementioned ^' interruption positions 27 and 28 , cause interruption to occur between 24 and 26 and 19 and 21 and will instead cause contact to be established between 24 and 25 and 20 and 21 . At the position of the aforementioned angled sections 21a and 24a the roller 8 will make contact with the aforementioned angled sections and will establish an electrical connection between the lines 21 and 24 . Beyond the aforementioned angled sections 21a and 24a are two interruption positions 30 and 31 which the roller 8 will pass before it interacts with and establishes contact between the lines 22 and 23 . The contact events will occur in the reverse sequence with the slide moving in the opposite direction. It is assumed that the lines can be routed and arranged in a manner other than that illustrated here, and that in this way different contact events can be made to occur in accordance with existing wishes.

The number of rollers may be varied, as may the number of roller contact paths for each roller.

The invention is not restricted to the embodiment described above by way of example, but may undergo modifications within the context of the following Patent Claims and the idea of invention.