JPS5824506Y2 - Frequency display mechanism in tuning device - Google Patents

Description

[Detailed description of the invention] This invention is an improvement of a frequency display mechanism for a tuning device in which a frequency scale is provided on the surface of a cylindrical rotating member that rotates in response to the movement of a sliding member that interlocks with a variable tuning element. It is related to.

Such a frequency display mechanism is superior in that the frequency display surface can be made small, but in conventional such mechanisms, the rotating member is rotated by the movement of the sliding member, so the interaction between the sliding member and the rotating member is Because a string is hung in between, it is troublesome to hang the string, and it is not possible to hang the string in a uniform manner.In addition, over long periods of use, the string stretches and the display becomes distorted. There was also the problem of getting started.

This proposal was developed in view of the above-mentioned problems, and its purpose is to provide a frequency display mechanism that is easy to assemble and is durable enough to withstand long-term use. For this purpose, one end of a rotating lever whose intermediate portion is pivotally connected is connected to a sliding member, and a gear provided at the other end is meshed with a gear provided on a cylindrical member.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the external appearance of a tuning device using the frequency display mechanism of the present invention, 10 is a channel selection and tuning operation shaft, 11 is a volume operation shaft with a switch, and these operation shafts are located on the right side of the housing 13. A frequency display surface 14 and a band display surface 15 are provided on the front of the Uzing 13.

A cursor line 16 is attached to the frequency display surface 14,
The tuning frequency of the tuning device is displayed in cooperation with the frequency scale described below.

The main parts of the internal structure of the tuning device will be explained in detail below with reference to FIGS. 2 to 6. The tuning and tuning operation shaft 10 is:
・It is mounted rotatably and slidably in the axial direction inside the hollow volume control shaft 11 with a switch, which is rotatably mounted in the hollow part of the bearing shaft 20 attached to the right side plate 13' of the housing 13. First and second gears 21 and 22 are fixed to one end of the operating shaft 10 for the purpose described later.

The operating shaft 10 has a ball 23 and a bullet plate 24 provided on the operating shaft 11.
It can be positioned at first and second positions with respect to the operating shaft 11 by first and second circumferential grooves 25 and 26 that cooperate with each other.

A rotating shaft 27 parallel to the operating shafts 10 and 11 is rotatably supported between the right side plate 13' and the left side plate 13, and a storage device 28 is fixed to this rotating shaft 2T. There is.

This storage device 28 has a cylindrical drum shape as a whole and has a button, and a gear 29 on the center outer periphery that meshes with the first gear 21 when the operating shaft 10 is in the first position as shown.
are integrally formed.

On the end face of the storage device 28, there are a plurality of small-diameter gears 30 that mesh with the second gear 22 when the operating shaft 10 is slid from the illustrated state to the second position, that is, the number corresponds to the number of selected channels. Each of them is rotatably arranged at a fixed angle.

A threaded rod 31 is screwed into the center hole of the gear 30 and is adapted to move in the axial direction as the gear 30 rotates.

A variable tuning inductance element 31' is also attached to the housing 13 by suitable fasteners (not shown).
A magnetic core 32 of this element 31' is supported by a die-cast sliding member 35 that is slidably guided by guide rods 33 and 34 parallel to the axes 10 and 11, etc.

This sliding member 35 is integrally formed with an extension piece 36 that comes into contact with the tip of the screw rod 31, and the contact of this extension piece 36 with the screw rod 31 biases the sliding member 35 in one direction. This is done by the coil spring 3T stretched between the housing 13 and the housing 13.

A cam disk 38 having alternately the same number of peaks and valleys as the threaded rods 31 is fixed to the rotating shaft 20, and one valley of the cam disk 38 has an end that swings. A trochanter 40 is fitted into the intermediate portion of the swinging member 39, which is freely supported on the shaft.

A shaft pin 41 is set at the other end of the swinging member 39,
This pin 41 is connected to a groove 44 formed in an upright piece 43 at one end of an L-shaped rotating member 42 that is rotatably supported at a bent portion.
is mated to.

A spring 45 is stretched between the housing 13 and the swinging member 39, and the spring 45 moves the trochanter 4.
0 is held in the trough of the cam disk 38, and the storage device 28 is positioned.

... The housing 13 is further provided with a rotating lever 46 whose intermediate portion is pivotally connected, and one free end of this rotating lever is bent at right angles to the surface of the rotating lever 46, and the tip thereof is bent at right angles to the surface of the rotating lever 46. A trochanter 47 is provided, and a fan-shaped gear 48 is formed at the other end of the rotary lever 46.

The rotary lever 46 is biased in one direction by a spring 49 so that the rotor 40 thereon comes into elastic contact with an inclined surface 35' formed integrally with the sliding member 35 at its outer circumferential arc surface.

The sector gear 48 meshes with a gear 52 provided on a cylindrical member 51 rotatably mounted on a shaft 50 provided in the housing 13 parallel to the shafts 10, 11, etc.

Note that a second cylindrical member 55 having a gear 54 that meshes with a gear 53 formed integrally with the cam disk 38 is rotatably mounted on the shaft 50.

Frequency display scales and band display identification characters or codes are provided on the circumferential surfaces of the cylindrical members 51 and 55, respectively, and a portion of these are attached to the tuning frequency display surface 14 and the band display surface 15 to the outside of the Ujifugu 13. It looks like you're looking into it.

The operation of the apparatus described above will be explained.

When the operating shaft 10 is pressed from the illustrated state, the operating shaft 10
slides axially in the second position 1 such that the first gear 21 is disengaged from the gear 29 of the storage device 28 and the second gear 22 meshes with one of the gears 30 of the storage device 28 .

When the shaft 10 is rotated in this state, the gear 30 is rotated, the screw rod 31 screwed thereon is moved in the axial direction, and its protrusion length t is changed.

Since the extension portion 36 of the sliding member 35 is in contact with the tip of the threaded rod 31, as the protrusion length t of the threaded rod 31 changes, the sliding member 35 moves according to or against the spring 37. By this, the variable tuning inductance element 3
1 is tuned to a station that is variably tuned.

At the same time, the inclined surface 35' of the sliding member 35 also moves, so that the rotating lever 46, which is in elastic contact with the inclined surface 35' via the rotor 47, resists the spring 49 or rotates accordingly. As a result, the gear 52 meshed with the sector gear 48 of the rotation lever 46 is rotated, and the cylindrical member 51 is rotated.

The position at which the cylindrical member 51 rotates and stops corresponds to the protrusion length t of the screw rod 31 that has been moved and changed at that time, and if the station that is being received at that time is being received, the broadcasting frequency of that station will be changed to the cylindrical shape. The frequency is indicated by cooperation between the frequency scale attached to the circumferential surface of the member 51 and the cursor line 16 on the frequency display surface 14.

Next, from this state, pull the operating shaft 10 to the first position as shown in the figure.
When the storage device 28 is rotated after being in the position, the storage device 28 starts to rotate via the gear 29 that meshes with the gear 21, and the cam disk 38 fixed to the rotating shaft 27 also starts to rotate.

Then, the trochanter 40 on the swinging member 39 that has been fitted into the valley of the cam disk part is removed from the valley, and this causes the swinging member 39 to swing counterclockwise in FIG. The rotating member 42 connected via the shaft pin 41 on the swinging member 39 rotates, and the other end of the rotating member 42 is moved largely.

During this movement, the other end of the shaft pin 3 on the sliding member 35
5, the sliding member slides against the rubber spring 37, and releases the contact between the extension piece 36 of the sliding member 35 and the threaded rod 31.

Then, when the operating shaft 10 is rotated by a predetermined angle, the storage device 2
8 and the trochanter 40 on the rocking member 35 in the next valley of the cam disk 38.
is inserted, and the swinging member 35 and the rotating member 42 return to the illustrated state.

At the same time, the sliding member 35 is pulled by the spring 37 and slides in the return direction, so that the extension portion 36 of the sliding member 35 moves toward the storage device 28.
The variable tuning inductance element 31 is positioned by contacting the next screw rod 31.

In the process of this operation, the cylindrical member 51 rotates as the sliding member 35 slides, and this rotation causes the extension 3 of the sliding member 35 to rotate.
5 comes into contact with the screw rod 31 and stops, and the frequency stored in the screw rod 31 is displayed.

Further, the second cylindrical member 55, which is interlocked with the storage device 28 via the gear 54 meshing with the gear 53 integrated with the cam disk 38, also rotates, and the broadcast band stored in the threaded rod 31 is rotated. will be displayed.

Of course, in this case, it is clear that the electric circuit is also switched by a band changeover switch (not shown) which is activated by the rotation of the storage device 28.

Next, when the operating shaft 10 is moved to the second position again from this state and rotated in the same manner as described above, the gear 30 that meshes with the second gear 22 rotates, and the protruding length of the threaded rod 31 changes. Further selection of other stations is thereby effected.

By repeating such operation of the operating shaft 10, the protruding lengths of all the screw rods 31 included in the storage device 28 can be adjusted, and a plurality of stations can be stored in the storage device 28.

Thereafter, by rotating the operating shaft 10 in the first position shown, a desired station can be easily selected from among the stored stations, and the frequency of that station can be accurately displayed.

In the embodiment described above, the inclined surface 35' of the sliding member 35
The sliding member 35 and the rotating lever 46 are connected by elastically contacting the trochanter 47 on the rotating lever 46 with the inclined surface facing the rotating lever 46 and the trochanter facing the sliding member 35. Alternatively, instead of connecting by elastic contact with the trochanter against the inclined surface, a diagonal hole and a shaft pin may be provided on the sliding member, and a pivot lever may be provided with a diagonal hole and a shaft pin engaged with the diagonal hole to perform the connection. You can.

As described above, according to the present invention, the sliding member and the cylindrical member are connected by one end being connected to the sliding member and the other end being provided with a sector gear that meshes with a gear provided on the cylindrical member. Because this is done by a rotating lever pivoted in the middle, it is easy to assemble without the hassle of assembling like with strings, and the connection will not become distorted after long-term use. Therefore, it is possible to obtain many practical effects such as accurate tuning frequency display for a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a tuning device using the frequency display mechanism of the present invention, Fig. 2 is a sectional view showing a part of the internal mechanism of Fig. 1, and Fig. 3 is a line 3-3 in Fig. 1. Sectional view along the line, No. 4
The figure is a cross-sectional view taken along the line 4--4 in FIG. 1 with a part omitted, and FIG. 5 is a cross-sectional view showing a part of the internal mechanism in FIG. FIG. 6 is a perspective view showing the main parts of the proposed mechanism used in the device shown in FIG. 1. In the figure, 31 is a variable tuning inductance element, 35 is a sliding member, 35' is an inclined surface, 46 is a rotating lever, 47 is a trochanter, 48 is a sector gear, 51 is a cylindrical member, and 52 is a gear. .

Claims (1)

[Scope of utility model registration request] In a frequency display mechanism in a tuning device in which a frequency scale is provided on the surface of a cylindrical member that rotates in response to the movement of a sliding member that interlocks with a variable tuning element, one end of a rotating lever whose intermediate portion is pivotally connected is used. , a rotary lever is connected to the sliding member so as to rotate as the sliding member slides, and a sector gear provided at the other end is meshed with a gear provided on the cylindrical member. A frequency display mechanism featuring: