JPS5855615Y2 - Multi-rotation variable impedance device - Google Patents

Description

[Detailed description of the invention] This invention transmits the rotational force of the rotating shaft to the contact sliding mechanism that slides on the impedance element by frictional conduction, and the engagement impact accompanying the rotation of the rotating shaft increases the allowable strength at the locking protrusion. The present invention relates to a multi-rotation type variable impedance device that protects a locking projection and the like by idling a rotating shaft when the force is stronger than the above.

This kind of multi-rotation type variable impedance device has recently been made smaller and more precise, and the locking protrusion and contact sliding mechanism have a fine structure, which inevitably reduces the allowable strength (allowable stress). Therefore, when the rotational force of the rotation shaft exceeds the allowable stress of the locking projection, it is necessary to protect the locking projection and the contact sliding mechanism.

First, prior to explaining the present invention, the sectional view of FIG. 1 and the sectional view of FIG.
An example of a conventional multi-rotation type variable impedance device will be described with reference to a sectional view taken along line II--II in FIG.

1 is a rotation axis, 2 is a spiral impedance element 1
This is a cylindrical insulating casing with 1 fixed to the inner wall.

3 is a front cover disposed covering one end of the casing 2;
Reference numeral 8 denotes a locking projection provided on the inner surface of the front cover 3 integrally therewith.

5 and 6 are a pair of clamp washers for installing the bearing/panel mounting bracket 4 at a fixed position on the rotating shaft 1; 9 is a pair of clamp washers that rotates with the rotation of the rotating shaft 1 to vary the resistance value; This is an insulating cylinder placed coaxially with the moving shaft 1.

The extension part of the rotating shaft 1 is press-fitted into the hollow part of this insulating cylinder 9 so as to fit and be integrated, and the top of the insulating cylinder 9 is made of cylindrical resin or oil-free metal. A tubular collar 20 is inserted concentrically.

21 and 23 are input terminals connected to the starting end and the terminal end of the spiral impedance element 11 and led out to the outside of the case 2; 22 is an annular conductor 22' arranged on the inner surface of the back cover 24;
This is an output terminal connected to and led out to the outside of the housing 2.

Further, reference numeral 16 denotes a locking projection provided on the inner surface of the above-mentioned back cover 24 integrally therewith.

10 is a thin cylindrical piece made of insulating material, and its hollow part is forced to fit concentrically into the insulating tube 9;
It is possible to freely slide only in the longitudinal direction of the insulating cylinder 9.

Numerals 15 and 17 are locking projections provided integrally with the upper and lower ends of the insulating piece 10, and these are provided on the back cover 24 as the insulating piece 10 moves, as will be described later. The locking protrusion 16 provided on the front cover 3 and the locking protrusion 18 provided on the front cover 3
engage with.

Reference numerals 12, 13, and 14 are tongue pieces provided on the sides of the insulating piece 10 in opposite directions in the normal direction. Together, the spiral impedance element 11
are slidably engaged from the upper end to the lower end or vice versa, and the tongue pieces 13 and 14 provided on the opposite side to the tongue piece 12 are arranged in a spiral shape so as to always sandwich a part of the spiral impedance element 11. The impedance element 11 is moved from the upper end to the lower end or vice versa.

Further, 19 is a contact slider provided on the insulating piece 10, one end of which is in sliding contact with the spiral impedance element 11, and the other end is a slide plate provided on the side of the insulating cylinder 9 along its longitudinal direction. 26.

The slider 25, which has two protruding pieces provided at the end of the slide plate 26, slides onto the annular conductor 22', thereby moving the spiral impedance element 11.
The portion where the upper contact slider 19 makes contact is led out to the output terminal 22 of the spiral impedance element 11.

In the conventional multi-rotation type variable impedance device having the above-described configuration, when the rotating shaft 1 is rotated clockwise or counterclockwise, the rotational force is directly transmitted to the insulating cylinder 9.
The insulating piece 10 moves vertically along the spiral impedance element 11 provided on the inner surface of the casing 2, and eventually the locking protrusion 15 comes into contact with the locking protrusion 16, and the locking protrusion 17 becomes the locking protrusion. 18.

As the rotation shaft 1 rotates, a change in impedance is detected between the output terminal 22 and the input terminals 21 and 23.

By the way, in the conventional device described above, when the rotational force of the rotating shaft 1 exceeds the strength of the locking projections 15, 16, 17.18, an allowable stress is applied to the locking projections 15, 16, 17.18. The above unnecessary force is added as a burden, and the front cover 3 and back cover 2
4 and the locking protrusions 15, 16, 17, 18 of the insulating piece 10
There is a risk that you will miss it.

This is a particular problem in small, high-precision devices.

In view of this, the present invention has a simple structure and is inexpensive, and when the rotational force of the rotating shaft 1 exceeds the strength of the locking projections 15, 16, 17.18, the locking projections 15, 16, 17.18 Even if an unnecessary force exceeding the allowable stress is applied to the locking projections 15° and 16.
This paper aims to propose a multi-rotation type variable impedance device that does not have the risk of becoming familiar with 17.18.

Below, an example of the multi-rotation type variable impedance device according to the present invention will be explained in detail with reference to FIGS. 3 to 6.
Components corresponding to those in FIGS. 1 to 3 are designated by the same reference numerals, and redundant explanation thereof will be omitted.

The multi-rotation type variable impedance device according to the present invention is provided with a clutch mechanism 49 whose end portions are disposed on the rotating shaft 1 and the insulating tube 4 and are arranged facing each other to transmit the rotation of the rotating shaft 1 to the insulating tube 9. This is what I did.

As shown in FIG. 5, this clutch mechanism 49 rotates on one axis
a wave-shaped washer 7 having elasticity that is attached to the end of the insulating cylinder 9 and transmits its rotation to the insulating cylinder 9 by friction due to surface contact;
It consists of a flat washer 8 provided at the end of the insulating tube 9 and in surface contact with the wave-shaped washer 7.

Also, a middle rotation shaft 1' is provided within the rotation shaft 1,
As shown in FIG. 6, a flange 1'' is provided at one end of the middle rotating wheel 1', and a collar 20 inserted into the middle rotating shaft 1' is embedded in the opening 9' of the insulating tube 9. be done.

Furthermore, a clutch mechanism 4 is provided at the other end of the middle rotation shaft 1'.
Left-handed screw 41 as adjustment means for item 9. A screw hole 1'' to be screwed into this is provided sufficiently deep.

As a result, when the screw 41 is rotated to the right, the screw 41
When the head of the screw 41 is pulled down at the stepped portion of the opening at the lower end of the rotating shaft 1, a force is exerted to pull out the middle rotating shaft 1'.

Then, due to this force, the insulating tube 9 is pulled downward together with the middle rotating shaft 1', and the wave-shaped washer 7 is pressed by the flat washer 8 against its elasticity, and the rotating shaft 1 and the insulating tube 9 are pushed together by the flat washer 8. A frictional force is generated between the

Note that this frictional force can be easily finely adjusted by adjusting the degree of rotation of the screw 41, so that a desired frictional force can be easily obtained.

In addition, 43 is the panel for mounting, 44 is the panel tightening nut, 4
5 is a handle, that is, a knob, and 46 is a handle attachment screw.

According to such a configuration, when the rotating shaft 1 is rotated, the clutch mechanism 49 provided between the rotating shaft 1 and the insulating tube 9
The rotational force of the rotating shaft 1 is transmitted to the insulating tube 9 by conduction due to friction between the rotating shaft 1 and the insulating tube 9 by the wave-shaped washer 7 and the flat washer 8 having elasticity.

Due to this rotation, the insulating piece 10 slides on the spiral impedance element 11 from one end to the other end using the spiral impedance element 11 as a guide, and changes in impedance while in the sliding state. It is possible to take it out as an output from the output terminal.

Note that the locking protrusion 15 provided on the insulating piece 10 is connected to the back cover 24.
When the rotation direction is reversed, the locking protrusion 17 provided on the opposite side of the locking protrusion 15 of the insulating piece 10 engages with the locking protrusion 16 of the top cover 3 and stops. It engages with the stop projection 18 and stops.

By the way, if the impact of these engagements is stronger than the allowable strength, the rotating shaft 1 will slip on the clutch mechanism 49 and will idle.
Damage to the locking projections 15, 16, 17, 18 and the contact sliding mechanism, that is, the insulating cylinder 9, the insulating piece 10, and the contact slider 19 can be prevented.

Incidentally, since the clutch mechanism 49 described above is mainly composed of the wave-shaped washer 7, there is almost no effect on the size reduction of the multi-rotation type variable impedance device.

Next, other embodiments of the present invention will be described with reference to FIGS. 7 and 8, but parts corresponding to those in FIGS. .

That is, in this example, the adjusting means of the clutch mechanism 49 is connected to the insulating tube 9.
This is the case where the collar 2 is provided at the end of the rotating shaft 1.
A plurality of adjustment washers 48 (three in the illustrated example) are inserted as adjustment means for the clutch mechanism 49 between the lock washer 47 that fixes the rotating shaft 1, and the number of adjustment washers 48 can be increased or decreased as appropriate. By doing so, the pressing force of the wave-shaped washer 7 of the clutch mechanism 49 is adjusted.

By providing the adjustment means for the clutch mechanism 49 in this way, the rotation shaft 1 can only be used when a strong rotational force is applied to the rotation shaft 1, even if the degree of friction at which friction transmission starts to slip is not finely adjusted. If it is enough to make a rough adjustment such that the wheel spins idly, it will have sufficient practical effect.

Next, an example in which the present invention is applied to a multi-rotation type variable impedance device in which a spiral impedance element is provided on the outer peripheral surface of the contact sliding mechanism described above will be explained with reference to FIGS. 9 to 11. , parts corresponding to those in FIGS. 1 to 8 are designated by the same reference numerals, and their explanations will be omitted.

FIG. 9 is a sectional view of the multi-rotation type variable impedance device in this example, FIG. 10 is a plan view thereof, and FIG. 11 is a rear view thereof.

In this example, the insulating cylinder 10' is provided with a spiral protrusion 31 on its outer peripheral surface, and the surface of the protrusion 31 has a groove 11 into which the spiral impedance element 11 is fitted and fixed. ' is provided.

In addition, three pillars 27 are installed between the front cover 3 and the back cover 24, and these are assembled, and the rotation shaft 1 is attached to these three pillars 27.
The book can be rotated at the center of the book support 27.

4Z4// is the rotation shaft 1 provided on the front cover 3 and back cover 24
The bearing 1' is a collar provided at the end of the rotating shaft 1 to prevent the rotating shaft 1 from slipping out.

A wire 28 is inserted into each of the two pillars 27, and the wires 28 are connected to each other by a connecting rod 29.

Furthermore, a tongue piece (not shown) is protruded from one end of the connecting rod 29, and this tongue piece has a guide groove provided at the same pitch as the spiral impedance element 11 provided on the insulating cylinder 10, as described above. 32 and is guided within the guide groove 32 by the rotation of the insulating cylinder 10' due to the rotation of the rotating shaft 1.

Then, by clockwise rotation of the rotation shaft 1, the guide 28 moves toward the back cover 24, and eventually moves to a locking protrusion (not shown) provided at the upper end of the guide groove 32 and stops.

Further, as the rotation shaft 1 rotates to the left, the guide 28 moves toward the front cover 3, and eventually moves to a locking protrusion (not shown) provided at the lower end of the guide groove 32, and then stops.

In addition, a contact slider 19 is attached to the information 28,
This slides on the spiral impedance element 11 as the wire 28 moves.

21' and 23' are slide rings and slide lever lead-out devices for leading to the input terminals 21 and 23 at both ends of the spiral impedance element 11; 11' is a lead-out wire from the contact slider 19 to the output terminal 22; 3' is a screw hole for panel mounting.

In this example, a wave-shaped washer 7 and a flat washer 8 are arranged between the rotating shaft 1 and the insulating cylinder 10' of the rotatable contact sliding mechanism. A clutch mechanism 49 is provided, and the rotational force of the rotating shaft 1 is transmitted to the insulating cylinder 10' through friction between the wave-shaped washer 7 and the flat washer 8 of the clutch mechanism 49. has been done.

In addition, when it is desired to precisely fine-tune the degree of friction of the clutch mechanism 49 to a predetermined value in the device having the above-mentioned configuration, the rotating shaft 1 can be made to have a double shaft structure of inner and outer shafts in the same manner as described above. I can do it.

Thus, the multi-rotation type variable impedance device of the present invention has a simple structure and is inexpensive, and when the engagement impact accompanying the rotation of the rotation shaft is stronger than the allowable strength of the impact of the locking protrusion, the rotation is stopped. Because the shaft slips in the clutch mechanism and spins idly,
Breakage of the locking protrusion and the insulating cylinder serving as the contact sliding mechanism can be prevented.

Further, since the clutch mechanism described above is mainly composed of a wave-shaped washer, there is almost no dimensional effect on miniaturization of the multi-rotation type variable impedance device.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of a conventional multi-rotation type variable impedance device, Fig. 2 is a sectional view taken along line II-II in Fig. 1, and Fig. 3 is a portion of a multi-rotation type variable impedance device according to the present invention. 4 is a sectional view taken along line IV-IV in FIG. 3, FIG. 5 is a plan view and side view of the wave-shaped washer in FIG. 3, and FIG. 6 is a partially enlarged view of FIG. 3. 7 is a partially enlarged view of another embodiment of the present invention, FIG. 8 is a partially enlarged view of FIG. 7, FIG. 9 is a partially sectional view of still another embodiment of the present invention, and FIG.
The figure and FIG. 11 are a rear view and a plan view thereof. 1 is a rotating shaft, 2 is a case, 3 is a front cover, 10 is an insulating cylinder, 24
41 and 48 are adjusting means for the clutch mechanism 49;
49 is a clutch mechanism.

Claims (1)

[Scope of utility model registration request] a rotating shaft, an insulating piece having a pair of upper and lower locking protrusions and being rotated by the rotating wheel to vary the resistance value; and an insulating tube arranged on an axis concentric with the rotating shaft and interlocking with the insulating piece. A flat washer, a wave-shaped washer, and a washer are disposed between the rotation shaft and the insulating tube, and the ends of the washers are arranged to face each other so that the rotation of the rotation shaft is directed to the insulating tube. A clutch mechanism for transmitting a transmission, an adjusting means for applying an axial force to the flat washer and the wave-shaped washer to adjust the pressing force of the clutch mechanism, and engaging with a locking protrusion on one of the insulating pieces. A multi-rotation type variable impedance device comprising a case body comprising a back cover having a locking protrusion that engages with the other locking protrusion, and a front cover having a locking protrusion that engages with the other locking protrusion and locking the rotation shaft.