SU324662A1 - KEYBOARD SWITCH - Google Patents

Description

The invention relates to electronic engineering, in particular, to a constructive implementation of a key switch for use, for example, in an electronic counting apparatus for inputting a set of information.

Known key switches containing microswitches and switching mechanism, equipped with keys connected to the levers, and the shaft with the cams and ratchet wheel.

Known key switches do not allow the switching mechanism to return to its original position without affecting the microswitches, as a result of which it is possible to use node-like non-switches to enter information at a certain address only in combination with additional electric or relay devices.

The purpose of the invention is to create a switch, ensuring that the switching mechanism returns to its original position without affecting the microswitches.

For this purpose, an axially spring-loaded shaft is applied in the switch, the ratchet wheel of which is provided with a truncated cone adjacent its tip to the end plane of the ratchet wheel and keeping the pushing pawl of the wheel in the iodine state when the switching mechanism returns to its initial position.

FIG. 1 shows a general view of the switch; in fig. 2-6 - sections showing structural details of the non-switch; in fig. 7 shows a kinematic diagram of the connection of microswitches with the levers of the numeric keys and the “SKIP” keys; in FIG. 8 is a diagram of the connection of the switches with the keys “RESET and“ VB1DACH ”; FIG. 9 and 10 show details of the interaction of the details, respectively, when typing information and when returning the switching mechanism to the starting position; in fig. 11, 12 and 13 are shown by blocking plates when pressing the numeric key, the RESET key and the SKIP key, respectively.

Switch mounted on the board /. On bracket 2 with micro switches 3 and

limiter 4, comb 5, strips 6, 7, springs 8 and 9, strap 10 on which switches 5 and cam // are fixed, on three independent axes 12, 13 and 14 are assembled keyboard levers consisting of numeric keys from "1 to" About and the keys "RESET," PASS and "EXIT. The levers of the numeric keys are rotated on axles 12, 13 and 14, and the levers of the keys "RESET," SKIP, "OUTSTANDING can only be rotated

15 and bearings 16. On axles 12 and 14, a spring-loaded frame 17 with a pawl 18 rotates. The keyboard levers and frame 17 are located in the slots of the dies 5, 19 and cannot move along the axis.

The locking mechanism contains placed between the combs 19, 20, plates 21, 22, 23 n bounding ilastipes 24. On the combs 19, 20 there are two crossbars 25 and 26.

In the sleeves 27 of the bracket 2 on the bearings 28 there is a roller 29 with cams 30, a ratchet wheel 31 with a truncated cone 32, which extends towards the end plane of the storage wheel, a bearing 33, a sleeve 34 and a helical spring 35. The roller 29 moves axially limited to lids 36.

The reset mechanism consists of a bracket 37 and a roller 38 with levers 39, 40 rotating in the pads 41. The bracket 37 is fixed to the strap 42 with springs 43 and 44, with the rims 45. On the plate with the levers of the OUT key the locking mechanism 46 is installed (FIG. one).

The numeric keys from “1 to“ O and the key “PASS are intended for typing information. The “RESET” key is used to reset erroneously typed information. The EXIT key transmits the collected information to the destination. Under each numeric key are located one by one, and under the keys “PASSING”, “RESET and“ OUTPUT by two microswitches 3 (row I), intended for closing information or service circuits. Below the cams 30, located on the roller 29, are located in a series of fifteen microswitches 3 (series I), intended for closing and opening the address electric circuits.

The lever of any information key (fig. 7 n 9) during forward running, turning around one of the axes 12, 13, 14, closes the microswitch 3 p and I, presses through the frame 17 n the dog 18 to the wheel 31, turning it together with roller 29 by cams 30 and an angle sufficient for one of the microswitches 3 rows to close through spring 9 one //. Under the action of the springs 43 and 44, the information key reverses and opens the switch 3 p and I; In this case, the wheel 31 with the roller 29 and the cams 30 is fixed in the turned-up state by the spring 8, and the switch 3 row and II remains closed. Simultaneously with the information key lever, the frame 17 is returned to its original position by the action of the spring 47, moving the dog 18 to one tooth of the wheel 31.

In subsequent actions on any of the information keys, the previously closed 3-row II microswitch is first opened, and then the sequence of interaction of the parts is repeated until

is the fifteenth pressing, and the closing sequence of the microswitches 3 is always maintained in row II. The sixteenth pressing of the information key opens the last microswitch in row II, closes and opens the microswitch 3 p. I. The seventeenth and all subsequent presses of the information keys do not affect the roller 29 due to the absence of teeth on

the rest of the wheel 31, until the roller 29 with the cams 30 is returned by pressing the "RESET or EXIT" keys to their original position. With the actual keystroke "RESET or

"EXIT (Fig. 8 and 10), the key lever acts on the corresponding microswitches 3 p and I and simultaneously through the levers 39, 40, the cam 7 / and the bearing 33 biases the roller 29 with the wheel 31 in axial direction, freeing them from the stopping effect the springs 8 and the pawl 18. The pawl 18 and the grunt 8 rest on the cone 32 of the ratchet wheel 31 and are held in the same position, and the spring 35, unwinding, turns the released roller 29 with the keeper into its original position until it stops.

During the reverse course, the lever of the key "RESET (OUT) on microswitches 5 p and I and roller 29 is removed.

The spring 35, uncoupling, displaces the roller 29 in the axial direction up to the stop, and the bearing 33, not moving with the roller 29, returns the cam 11, the levers 39 and 40 to the original position.

The operation of the EXIT key differs from the operation of the RESET key in that the mechanism 46 is under its levers, blocking the key in the upper position after it is pressed. Key unlocking is performed

electric impulse from the outside.

When working on the key switch, you can press only one key at a time. At the same time, the set of nlastins 21, 22, 23 is shifted in such a way that it does not cover the rest

keys (Fig. 11 and 12). In this case, all the plates work as blocking.

When the "PASS" key is pressed (Fig. 13), its levers enter the slots of the plates and set them so that the gap between the plates breaks into two half-gaps. In this case, the keys between the keys of the keys work as one combinatorial ruler, reliably eliminating the blocking of all the other keys, except for the other.

Subject invention

A key switch containing microswitches and switching mechapism, equipped with keys connected to the levers, and a shaft with cams and a storage wheel, characterized in that, in order to ensure the return of the switching mechanism to its original position without affecting the microtransfer, it uses spring-loaded an axially mounted shaft, and the ratchet wheel of this shaft is equipped with a truncated cone, adjoining its tip to the flat face of the ratchet wheel, on which the storage wheel dog rests on returning switching mechanism to the initial position.

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