SU855770A1 - Programme-control change-over switch - Google Patents

Description

(54) PROGRAM SWITCH

The invention relates to electrical engineering and can be used in consoles, control panels and devices as a software switch. A multi-position rotary switch comprising a fixed case, reinforced on it with plates printed on contact pads, a rotary disk with a limb and flat contact springs for closing the corresponding contact pads on printed circuit boards and a device for fixing the positions of the disc are known. For software switching, a common circular contact is applied on the board and around it there are concentric conducting tracks with contact pads, with the program in certain places on it. When turning the disk on fixed positions, the flat contact spring connects the contact pads on tracks with fixed contact lobes. general circular contact. The inverse (reverse) switching program is achieved by adding to the same switch a board with an inverse arrangement of the contact pads interacting with its contact springs, and the leads from the contact tracks of the first and second boards are connected respectively to each other 1. The disadvantages of such a switch are the need for high precision manufacturing of parts, since switching is carried out synchronously on two boards, as well as large dimensions in width due to two boards. A switch is also known, comprising a housing, a closed insulating kriako, on which wire spring contacts with protrusions are fixed, a rotary disk with a printed circuit board on its end face, in contact with the contacts, and a device for fixing the position of the disk. One of these contacts is common. An inverse switching program is obtained by applying a different switch and using its printed circuit board, in which the pads are in relation to the first board in the inverse arrangement 2. However, such a switch has relatively large dimensions and does not

provides a reverse program switch.

The purpose of the invention is to reduce the size and expand the functionality, i.e. creating a switch specifying both direct and inverse switch programs.

To achieve this goal, the switch consists of a case, an insulating cover with wire spring contacts, one of which is common, a rotary disk with a limb and a printed circuit board at the end, a device for fixing the position of the disk, is provided with another common wire spring contact, the conductive layer on the printed circuit board is divided by a step-shaped insulating strip in a circle into two parts so that the inner part carries a direct switching program and the outer part inverse.

Spring-loaded wire contacts, which simultaneously serve as leads, are arranged in such a way that one of them slides constantly along the inner part of the conducting layer (common contact of the direct program), the second on the outer part of the conducting layer (common contact of the inverse program), and the remaining contacts are located between them in the zone where the insulation strip passes are stepped. These contacts, when the disk rotates on the inner or outer part of the conductive layer, are connected to the general contact of the program or to the contact of the inverse program in a sequence determined by the configuration of the insulating strip.

To reduce the size of the switch, the spring contacts, besides the common ones, are arranged in pairs on one line of a circle on the printed circuit board on the same circumference line, with the contacts of each pair spreading diametrically between each other, and the pairs of contacts are shifted relative to each other by an angle equal to half the angle of the fixed switching position that takes into account the configuration of the dividing isotational strip. This arrangement of the spring contacts 3 reduces the total amount of concentric contact tracks on the printed circuit board, which reduces its dimensions.

Improving the quality of contact is achieved by the fact that spring wire contacts, sliding on the printed circuit board, self-clean contact surfaces from the oxide, in addition, the printed circuit board is made by the transfer method, i.e. the printed circuit board and insulation strip are made flush. This provides the same equal surface of the conductive and insulating layer of the printed circuit board, which equalizes the contact pressure

friction is reduced at the points of transition from the insulating layer to the conductive layer, which reduces the transfer of metal deposits to the insulating surfaces, causing a decrease in the electrical resistance of the switch.

Each wire spring contact may have a rectangular shape or made in the form of a pair of parallel-arranged round-wire wires electrically connected to each other.

FIG. 1 shows a program switch, a general view, from the side in FIG. 2 shows section A-A in FIG. 1, in FIG. 3 and 4 - section BB in FIG. 2, in FIG. 5 shows a section B-B in FIG. 2 (view of a printed circuit board with wire contacts).

The switch consists of a housing 1, which is closed by a cover 2 of insulating material. A fixing spring 3 is installed in the housing. The cover 2 (Fig. 1 and 2} is made with parallel guide grooves 4 (Fig. 2-4) for installing 5.5 spring wire contacts, and 5 which are glued to the slots 4 in section b. Spring contacts 5 (Fig. 2} have a V-shaped section 7. The free ends of the 8 contacts are located in the guide groove 4, and the other ends 9 protrude beyond the cable 2 and form a contact terminal for connecting the switch to the device circuit. For increasing The elasticity of the wire spring contacts 5-5 have a rectangular cross-section with The sides are approximately 1: 2 (Fig. or consist of two parallel wires (Fig. 4) of circular sections. The movable part of the switch; the user consists of a rotating disk 10 fixed to its end of the printed circuit board 11 and a spacer sleeve 12. The rotary disk 10 (Fig. 1 and 2) is made with the overhang from the ends of the axes 13 and

14dl install disc in hole

15 in the housing 1 and the aperture 16 in the hatch 2. The cylindrical surface of the disk 10 (Fig. -1 to 2) has a limb 17

Claims (2)

with numbers or signs. The edge of the disk 10 is made with the protrusion 18 for fixing the position of the disk with a ps cmcmr spring 3 n for turning the disk. A PCB 11 is rigidly mounted on a swivel disc 10 (FIGS. 2 and 5), having a central hole 19 for inserting the rotary disc axis 13, On the side of the board 11, oriented to the spring contacts, a conductive layer is applied by means of a transfer layer, which is separated by isol 1 by the 20 strided foreshape of the configuration, depending on the program and the location of the contacts around the circumference, into two parts: the inner forming direct software surface 21, and the outer, forming the reverse inverse progrg1mmnaya surface 22 (Fig. Springs The contacts 5 are attached to their own V-shaped sections 7 to the surface of the printed circuit board 11 in the order that the common contact 23 of the program (Fig. 5} constantly rotates the board 11 on the surface 2 and the other common contact 24 on the surface 22. The remaining contacts are located in the zone of the insulation strip 20 and, depending on the angular position of the board 11, contact through the surface 21 or the surface 22 with the contact 23 and 24. The contacts 5 and 5 and 5 are arranged in pairs on the same line of a circle with diametrically opposite sides of the center with a radial shift from 180 ° at an angle (FIG. 5), equal to half the angle of the fixed position of the switch about. In FIG. 5, a printed circuit board 11 with a binary-coded inverse switching program in the 1-2-4-3 system, where the inner flashing surface 21 forms a direct program, and the outer surface 22 has its inverse value. In the indicated position of the boards 11, contact 5 is connected to contact 5, and contacts 5, 5, and 5 with its inverse contact 24. When the disk 10 is turned in the direction indicated by arrow G (Fig. 5) f, the printed circuit board 11 mounted on its end rotates and moves to the next fixed position by angle o, resulting in V-shaped sections 7 of 5-5 ™ contacts occupy the position D on the board 11. Consequently, in this position the boards 11 with the contact 23 are connected to the contact 5, and with the contact 24 - the contacts 5, 5 and 5. Thus, on one board it is possible to commutate contacts 5–5 about the new memory. on dzaoichno-encoded prokhramme, and on its inverse value or use only one of these options. Claim 1. Gap switch, comprising a housing, closed by an insulating curtain, on which wire spring contacts are fixed with protrusions, one of which is common, in the housing there is a rotary disk with a limb and a printed circuit board on one of its ends, which adjoins with the mentioned spring wire contacts, and the locking spring, characterized in that, in order to expand its functionality and reduce its size, it is equipped with another common wire spring contact, the printed board It is divided into two parts by a step-shaped insulating strip; its inner part carries a direct switching program, and the outer one is the reverse, the mentioned common wire spring contact constantly interacts with the surface of the printed circuit board that carries the reverse program, and the other spring wire contact comes with the surface of the printed circuit board carrying the direct program, with the other mentioned wire spring contacts arranged in pairs on one line. besides, the contacts of each pair are diametrically relative to each other, and the pairs of contacts are shifted relative to each other by an angle equal to half the angle of the fixed switching position. 2. The switch according to claim 1, characterized in that said parts of the printed circuit board and the step-shaped insulating strip are made flush. 3. The switch according to claim 1, characterized in that each wire spring contact has a rectangular shape .. 4. The switch according to claim 1, which is tactile in that the contact is made in the form of a pair in parallel with a circular wire with a circular cross section, electrically linked with each other 1. Sources of information taken into account in the examination 1. Authors certificate of the USSR 600628, cl. H 01 H 19/36, 1975. 2. Journal of the GDR. Radio fernsehen elektronik, 1978, No. 3, p. 196.