RU539U1 - Manual tuning mechanism - Google Patents

Abstract

A manual tuning mechanism comprising a slowing drum mounted on the shaft of a tunable element, a guide roller that are kinematically connected to each other by means of a cable covering them with a spring, a tuning knob and an arrow made on a slider mounted on a cable and mounted in a guide, characterized in that the tuning knob is rigidly mounted on the shaft of the adjustable element, the decelerating drum and the guide roller are structurally made as two identical parts connected by a cable forming closed loop with two transitions of the direction of movement, the ends of the cable are fixed to the spring.

Description

Manual tuning mechanism

The proposed useful model of the mechanism relates to instrumentation, can be used in radio receivers, mainly of the automobile type, and serves to transform the simplest movements of the operator’s hand into the necessary movements of the moving parts of the frequency elements of the radio receivers.

Depending on the method of transmitting movement from the control knob to the actuating element, settings are distinguished between flexible communication mechanisms, friction, gear, and also combined with various types of communication. The most widely used in practice are mechanisms with flexible and combined communications. Their advantage is the simplicity of design, as well as the ability to place elements in different planes and at any distance from each other.

In the simplest mechanism, often used in radios, for example, Selga, there is a tuning axis, on which the handle and the tuning element of the receiver (variable capacitor, ferrovariometer, variable resistor) are rigidly mounted, on the shaft of which a pulley is fixed. The rotation is transmitted from the tuning axis to the shaft of the tuning element by means of a flexible coupling, which is used as a lavsan cable. To indicate the frequency of the station to which they are tuned, use the arrow, which is re-merged, also using a cable connecting it to the pulley. The reciprocating movement of the arrow occurs along the guide. The disadvantages of this mechanism include the presence of an elastic deadlock in the cable, its slipping on the axis of the tuning knob: and the volume of the structure.

To reduce the volume and make the mechanism more compact, a combination of flexible and gear communication is used. Thus, the tuning mechanism of the commercially available car radio Start-203-stereo is known, where the tuning axis is connected to the shaft of the tuning element

M.cl. NOSCH, I / IO

(variable resistor) by means of a gear train with deceleration, and the arrow moves along the guide with a cable, moreover, the arrow is fixed to the cable, and it is wound on the tuning axis, during rotation of which the cable is wound and wound, moving the arrow. A spring is used to tension the cable. The disadvantages of this mechanism are elastic deadlock, i.e. with a slight rotation of the axis of adjustment, the arrow stays in place due to the elastic properties of the cable, design complexity, low smoothness of rotation of the axis of adjustment, due to the presence of gears and low efficiency in maintenance, since in order to cover the entire range (the course of the arrow is from the beginning to the end of the flap), you need to make the tuning knob seven turns, which is very inconvenient when tuning to a station, especially in automotive equipment (receivers, radio), where the operator is the driver, mostly busy driving cars mobile. In addition, the use of such mechanisms is not always justified, for example, in the simplest receivers and radio tape recorders with one VHF band.

A slightly better Vernier device according to A.S., USSR No. 1279055, MKI HOSjI / IO, taken as the closest analogue, as the closest to the proposed mechanic.

The device comprises a tuning knob mounted on an axis, a slowing drum mounted on the shaft of the adjustable element, guide rollers that are in kinematic connection between the assemblies.- by means of a cable with a spring covering them, the ends of which are fixed on the arrow, made in the form of a slide installed in the guide . . Moreover, the cable passes through the guide rollers, forming a quadrangular closed loop, respectively, with four transitions of the directions of movement. For reliable grip with the drum and axis, the cable has several turns on each of them. To ensure cable tension applied tension spring installed in the gap of the cable. The ends of the cable are fixedly connected on the arrow at two points.

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The device operates as follows. The rotation of the tuning knob when searching for the signal of the desired station is transmitted by the cable to the decelerating drum, causing the shaft of the tunable element to rotate. As a result, there is a process of winding and reeling the cable on the drum and axis, and the cable moves in the guide rollers, entraining the arrow fixed on it, which slides along the guide.

Unlike the tuning mechanism used in the Start-203-stereo radio, this device provides high smoothness of rotation due to the presence of a flexible connection between the axis and the adjustable element, but otherwise there are the same disadvantages:

-low quality settings due to the presence of elastic deadlock and slippage of the turns of the cable on the axis of the settings;

- low efficiency when tuning to the station.

The elastic dead passage here is due to a large number of transitions in the directions of movement of the cable and its large length, which can vary due to the presence of elastic properties in the cable.

The slippage of the cable turns occurs due to a change in its tension at the end of the shaft rotation of the tuning element and with further rotation of the tuning knob. At the same time, the winding of the turns on the axis is weakened, which leads to idle rotation of the axis, and this confuses the operator, who is forced to tune the receiver by ear in difficult traffic conditions.

The low efficiency during configuration is due to the same reasons as in the analogue described above.

In addition to the described shortcomings, the closest analogue has a design flaw, namely, the presence of three guide rollers and the need to fasten the cable at four points - two on the arrow and two on the tension spring, which reduces the manufacturability of the design.

The essence of the utility model is as follows, the manual tuning mechanism contains a slowing drum mounted on the shaft of the adjustable element, a guide roller, which are kinematically connected to each other by means of a cable covering them with a spring, a tuning knob, an arrow made on a slider mounted on a cable and installed in the guide. The tuning knob is mounted on the shaft of the adjustable element, the decelerating drum and the guide roller are structurally made as two identical parts, moreover, the cable connects them, forming a closed loop with two transitions of the direction of movement, and the ends of the cable are fixed to the spring.

The proposed manual tuning mechanism differs from the closest analogue in that the tuning knob is rigidly mounted on the shaft of the adjustable element, which structurally slows down the drum and the guide roller

are made identically, and the cable connects the drum and the roller, forming a closed loop with two transitions of the direction of movement, moreover, the ends of the cable are fixed to the spring. In the proposed mechanism design, there is no axis and one guide roller is used.

The figure shows the proposed manual tuning mechanism.

The manual adjustment mechanism comprises a decelerating drum I, a guide roller 2, which covers a cable 3 with a spring 4, an arrow 5 made on the slider 6, and a tuning knob 7. The slowing drum I and the tuning knob 7 are rigidly mounted on the shaft 8 of the tunable element 9, and the slider b is mounted in the guide 10 with the possibility of reciprocating movement and is simultaneously mounted on a cable 3, the ends of which are fixed on a spring 4. The cable 3 forms a closed loop with two transitions of the direction of movement, while its length is minimal, it eliminates backlash.

In a specific embodiment, the drum I and the guide roller 2 are structurally made as two identical pulleys, and the guide roller 2 is mounted on the axis II with the possibility of free rotation. Axis II, guide 10 and adjustable element 9 are fixed to the reception panel (//.

nickname (not shown in the figure), As a custom element used a variable resistor, the shaft of which makes 3/4 turn. For reliable grip (without slipping), 1.5 turns of cable 3 are wound on drum I. For reliable fixing of the slider on the cable, slots 12 are provided in the slider through which the cable passes with interlacing. Spring 4 provides the necessary cable tension 3.

The mechanism works as follows.

When the handle 7 is rotated, the electrical parameters of the tunable element 9 change, Drum I, rigidly fixed to the shaft 8, starts to rotate, while the cable 3 is unwound from the drum on one side, and is wound on the other hand, and thus moves along the guide along with it 10, slider b moves with arrow 5. When tuning to the station, arrow 5 stops at the appropriate point on the scale and indicates the wave of the tuning station.

The proposed mechanism is simpler in its design concept and allows for quick tuning to the station without slipping and deadlock, while doing no more than one turn of the tuning knob.

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Claims (1)

A manual tuning mechanism comprising a slowing drum mounted on the shaft of a tunable element, a guide roller that are kinematically connected to each other by means of a cable covering them with a spring, a tuning knob and an arrow made on a slider mounted on a cable and mounted in a guide, characterized in that the tuning knob is rigidly mounted on the shaft of the adjustable element, the decelerating drum and the guide roller are structurally made as two identical parts connected by a cable forming closed loop with two transitions of the direction of movement, the ends of the cable are fixed to the spring.