JPS6214750Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a push button tuner, in which alternating peaks and troughs of the approximately V-shaped cam portion of the slide cam plate are made to correspond to the specifiers of the push button member, so that the slide cam plate is The purpose of this invention is to eliminate unnecessary force and increase the slidable dimension of the slide cam to improve tuning accuracy.

Generally, when a push button member that is supported by the frame so as to be slidable in the front and rear directions is pushed in and slid, its regulator collides with the cam portion of a slide cam plate that can be slid in the left and right directions perpendicular to the front and back direction, thereby mutually restricting the positions. There is a push-button tuner of the type that performs tuning to tune the channel, and a conventional example thereof will be shown below.

An example of a conventional push button tuner is shown in FIG. In the figure, numeral 1 indicates a plurality of push button rods at adjacent pitches P, each of which has a regulating member 3 pivotally supported by a sliding plate 2, and is slidable in the directions of arrows A and B. 4 is a slide cam plate, which has a plurality of V-shaped cam portions 4 at adjacent pitches P;
a (cam right side 4a-1, cam left side 4a-2), and can freely slide in the directions of arrows C and D, but in the neutral slide position, the valley of the cam portion 4a corresponds to the center line of the push button rod 1 as shown in the figure. do.

At this point, the push button rod 1 is pushed and slid in the direction of arrow A, and the tip of the regulator 3 is attached to the cam right side 4a of the cam portion 4a.
-1 or the left side of the cam 4a-2 and reaches the trough to store or read out and select the channel. The dimensions are such that the cam right side 4a-1 is set so that the specifier 3 does not correspond to the adjacent non-compatible cam part 4.
Or the left-right dimension of the cam left side 4a-2, i.e. P/2
It is. Therefore, the maximum sliding range of the cam plate 4 from the neutral sliding position is half of the above-mentioned P/2 in the left and right direction, that is, P/4.

However, according to the above conventional example, as shown in the figure,
When the regulator 3 comes into contact with the valley of the cam part 4, the center line of the regulator 3 is inclined with respect to the directions of arrows A and B, so a deflection force in the direction of arrow C in the figure acts on the cam plate 4. However, there is a drawback that the cam plate 4 tends to move erroneously and cause frequency deviation, and if all stations are made to correspond to the above-mentioned relatively small slide dimension P/2, the accuracy of selecting individual stations will be low. There were flaws.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

2A to 2C are a plan view of one embodiment of the push button tuner according to the present invention, and a vertical sectional view taken along lines BB and C-C in FIG. 2A, respectively. In the figure, the push button tuner 11 has a frame lower plate 12 supporting a plurality of push button rods 13 (13-1 to 13-5) and further supporting a slide cam plate 14.

The frame lower plate 12 has holes 12d and 12e at corresponding positions in front and rear side plate parts 12b and 12c which are bent before and after the bottom plate part 12a, respectively.

The push button rods 13 respectively support a regulator 17 (17-1 or 17-2) on the lower surface of the sliding plate 15 with a pin 16 so as to be rotatable in a horizontal plane, and also have an elastic restraint plate 19 rotated in a vertical plane with a pin 18. Furthermore, a push button 20 (having a restraining cam portion 20a) is attached to the front end of the sliding plate 15 so as to be relatively slidable in the directions of arrows A and B. The regulators 17-1 are arranged on every other push button rod 13-1, 13-3, 13-5, and are formed by a pair of short abutting cam portions 17 bent downward on both sides.
-1a, 17-1b, and the regulator 17-2 is arranged on every other remaining push button rod 13-2, 13-4, and a pair of long dimension abutments bent downward on both sides, respectively. It has cam parts 17-2a and 17-2b.

The sliding plates 15 of the plurality of push button rods 13 are fitted into respective holes 12d and 12e of the front and rear side plate portions 12b and 12c at adjacent pitches P, and are biased in the direction of arrow B by a coil spring 21 fitted to the tip portion 15a. The stopper portion 15b comes into contact with the front plate portion 12b and is stopped.

The slide cam plate 14 has lower and upper V-shaped cam parts 14a and 14b at the front part, and has a core 22 at the right end that fits in and out of a coil (not shown) fixed to the frame lower plate 12, and has a bottom plate part. It is disposed on the upper surface of 12a by a pin 23 so as to be slidable in the directions of arrows C and D.

Here, the lower V-shaped cam part 14a has a pitch 2P (pitch is the dimension from V-shaped crest to crest or from V-shaped trough to V-shaped trough) at the front end of the slide cam plate 14 in the directions of arrows C and D. A notch is formed, and a cam right side 14a-2 and a cam left side 14a-3 are symmetrically inclined on both sides of each V-shaped valley portion 14a-1, and the slide cam plate 14 is neutrally slid as shown in FIGS. 2A and C. When in position, the V-shaped valley portion 14a-1 and its peripheral edge are the long dimension contact cam portions 17-2a, 17 of the respective specifiers 17-2 of the push button rods 13-2, 13-4, respectively.
Corresponds to -2b. The upper V-shaped cam part 14b has the V-shaped ridges 14a-4 of the lower V-shaped cam part 14a and the parts slightly set back from the inclined cam sides on both sides thereof from the lower surface side as shown in FIGS. 2B and 5, respectively. It is formed by half pressing and protruding from the lower cam part 14a by a distance l, and its pitch is also 2P. The upper V-shaped cam portion 14b has each V-shaped ridge portion 14b.
The right side of the cam 14 tilted symmetrically on both sides of -1
b-2, cam left side 14b-3, and this V-shaped peak portion 14b-1 is connected to the V-shaped cam portion 14a of the lower V-shaped cam portion 14a.
Since it corresponds to the ridge portion 14a-4, the figure 2A,
As shown in B, the V-shaped peak portion 14b-1 and its peripheral edge are the short dimension abutment cam portions 17-1a, 1 of the respective specifiers 17-1 of the push button rods 13-1, 13-3, 13-5, respectively.
Corresponds to 7-1b. The slide cam plate 14 is also connected to a manual tuning shaft (both not shown) via a clutch unit.

Note that the upper V-shaped cam portion 14b is not originally necessary, and the V-shaped cam portion 14a of the lower V-shaped cam portion 14a
-4 and its periphery can also be used in correspondence with the specifier 17-1, but according to this, the specifier 1 of the push button rod 13-1 (13-3, 13-5)
Each of the abutment cam portions 17-1a and 17-1b of 7-1 has its inner side abutted against the periphery of the V-shaped ridge portion 14a-4, and each of the regulators 17-2 of the push button rods 13-2 and 13-4 Since the outer sides of the contact cam portions 17-2a and 17-2b contact the periphery of the V-shaped valley portion 14a-1,
The pushing stroke of the push button rods 13-1 (13-3, 13-5) is smaller than that of the push button rods 13-2, 13-4, resulting in operational inconvenience. Therefore, the specifier 1 of the push button rod 13-1 (13-3, 13-5)
The V-shaped peak portion 14a-4 corresponding to V-shaped portion 7-1 and its peripheral portion are retracted backward by a predetermined distance as described above, and the upper V-shaped portion 14a-4 is
It is provided as a letter-shaped cam portion 14b.

Next, the operation of the push button tuner 11 will be described first in the case where the push button rod 13-1 (or 13-3, 13-5) and the upper V-shaped cam portion 14b are mutually restricted. By operating the manual tuning shaft, the slide cam plate 14 is slid, for example, in the direction of arrow C from the neutral slide position indicated by the dashed line in FIG. do.

Here, when the push button rod 13-1 is pushed in the direction of arrow A by operating the push button 20, the left abutting cam portion 17-1b of the regulator 17-1, which is in the neutral rotation position, first moves to the upper V-shaped cam portion. In order to come into contact with the left side 14b-3 of the cam 14b, the regulator 17-1 starts rotating counterclockwise as the push button rod 13-1 is further pushed and slid, and then the right abutting cam part 17-1a comes into contact with the right side 14b-2 of the cam as shown in FIG. At this time, the rotation of the regulator 17-1 is stopped and the push button rod 13-1
The slide of is also stopped.

Here, when the push button 20 is pushed further, the push button 20 slides relative to the sliding plate 15 in the direction of arrow A, and as shown by the two-dot chain line in FIG.
a enters the upper part of the front end of the restraining plate 19 and the restraining plate 19
In order to elastically deform the front end side downward using the pin 18 as a fulcrum, the rear end of the restraining plate 19 presses the regulator 17-1 against the sliding plate 15 and restrains it from rotating. The rear push button rod 13-1 slides back in the direction of arrow B until the stopper portion 15b abuts the front plate portion 12b again.

Next, when the manual tuning shaft is operated to select another station, it is assumed that the slide cam plate 14 reaches the position shown by the two-dot chain line, which is appropriately slid in the direction of arrow D from the solid line position in FIG. 3, for example. At this point, when the push button rod 13-1 is pushed and slid again in the direction of arrow A, the regulator 17
The right contact cam part 17-1a of -1 first contacts the cam right side 14b-2 and moves the slide cam plate 14 to the arrow C
Start sliding in the direction. Next, push button rod 13-
1, the left abutting cam part 17-
1b comes into contact with the left side of the cam 14b-3, the slide cam plate 14 returns to the position shown by the solid line in FIG. 3, and the first desired station is successively displayed and tuned.

Next, the push button rod 13-1 slides back in the direction of arrow B and stops; however, if you want to select and memorize another station using this push button rod 13-1, push the push button 20 to the second position.
After the relative slide returns to the position shown by the solid line in FIG. A, the restraint of the regulator 17-1 is released, and the rotatable state is achieved, the same operation as described above may be performed.

According to the above configuration and operation, when the push button rod 13-1 is pressed to the maximum, both abutment cam portions 17-1a and 17-1b of the regulator 17-1 always touch the corresponding cam right side 14b-2 and cam left side 14b-, respectively. 3 and apply the same force to each other in the direction of arrow B, and in addition, the right side of the cam 14b-2 and the left side of the cam 14b
The inclination angles of -3 with respect to the arrow A and B directions are the same. Therefore, the same but opposite component forces act on the slide cam plate 14 in the directions of arrows C and D, cancel each other out, and become zero, so that no deflection force in the directions of arrows C or D acts on it. Therefore, the slide cam plate 14 is always set at the same position without malfunction when the push button rod is repeatedly pressed, and no frequency deviation occurs.

Moreover, each contact cam portion 17-1 of the specifier 17-1
a, 17-1b is theoretically the right side of the cam 14b-2
The maximum sliding range of the slide cam plate 15 is also approximately P because it can correspond to the full width in the directions of arrows C and D (cam left side 14b-3), that is, approximately pitch P. In other words, from the neutral slide position to the left and right, the above-mentioned approximately P
It is possible to slide by half, that is, approximately P/2, which is approximately twice that of the conventional example described above, and the accuracy of selecting individual stations can be improved accordingly.

Next, a case will be described in which the push button rod 13-2 (or 13-4) and the lower V-shaped cam portion 14a are mutually restricted. Assume that in the same manner as in the above case, the slide cam plate 14 reaches the position shown by the solid line in FIG. 4 by manual tuning shaft operation, and the desired station is selected. If the push button rod 13-2 is pushed in here, the regulator 17-2
The abutting cam portions 17-2a and 17-2b sequentially contact the cam right side 14a- of the lower V-shaped cam portion 14a.
2, 14a-3, rotates clockwise and stops. When the push button 20 is further pushed in and slid relative to the other, the regulator 17-2 is held in the above-mentioned rotational position, and then the push button rod 13-2 slides back in the direction of arrow B.

Next, when the slide cam plate 14 is at the position indicated by the two-dot chain line in FIG.
2b is the cam left side 14a of the lower V-shaped cam portion 14a.
-3 and slide the slide cam plate 14 in the direction of arrow C, and finally the right abutting cam part 17-
2a also comes into contact with the cam right side 14a-2 and the cam plate 1
4 is returned to the solid line position to complete the read channel selection.

According to this configuration and operation, as in the case described above, when the push button rod 13-2 is pressed, the slide cam plate 1
Since the forces acting on the contact cam portions 17-2 cancel each other out, no frequency deviation occurs.
a, 17-2b is theoretically the right side of the cam 14a-2
(The left side of the cam 14a-3) can correspond to the full width, that is, the pitch P, and can similarly allow the maximum sliding range P of the slide cam plate 14, thereby improving the tuning accuracy.

FIG. 6 shows a modification of the upper V-shaped cam portion 14b of the slide cam plate 14, and this upper V-shaped cam portion 14b' is integrally formed as a wall portion extending in a V-shape on the upper surface of the slide cam plate 14. It is installed protrudingly.

Furthermore, the slide cam plate 14 shown in FIG. 5 may be formed by pasting together a lower cam plate and an upper cam plate, which are separate members, instead of being half punched using the press described above.

As described above, according to the push button tuner of the present invention, a plurality of channel selection members are arranged on a frame so as to be slidable in the front-rear direction and at adjacent pitches P, and each of the channel selection members is provided with a pair of left and right abutment cam portions which can be rotated in a horizontal plane. A slide cam member is arranged on the frame so as to be slidable in the left-right direction perpendicular to the front-rear direction. The slide cam portion is provided with a substantially V-shaped cam portion extending in the left-right direction, with a pitch of 2P from V-shaped peak to peak or from V-shaped valley to valley. The alternating V-shaped peaks and V-shaped valleys of the V-shaped cam portion are each sequentially rotated in the left-right direction. Since the structure is such that a plurality of channel selection members are associated with each other, and when any of the channel selection members is pushed in and slid, a pair of abutment cam portions of the determiner abut against a pair of mutually symmetrical inclined cam sides of either the V-shaped peak or the V-shaped valley, respectively, and the determiner and the slide cam member are mutually positioned and synchronized for channel selection. Therefore, when the channel selection member is pushed in to the maximum extent, the left and right abutment cam portions of the determiner are abutted against the symmetrical inclined cam sides on both sides of the V-shaped peak or the V-shaped valley of the V-shaped cam portion, respectively, with the same force.
The slide cam member is acted on in the reciprocating sliding direction by the same and opposite force components which cancel each other out to zero and no deflection force acts on it, so that the slide cam member does not malfunction, there is no frequency deviation and the tuning accuracy is improved. Also, the left and right abutment cam portions can be made to correspond to the full width of each of the inclined cam sides on both sides of the V-shaped cam portion, so that the maximum sliding range of the slide cam member is the adjacent pitch P of the tuning member.
This has the advantage that the channel selection accuracy can be improved by approximately twice the conventional accuracy.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the operation of a conventional example of a push button tuner, and FIGS. 2 A to C are plan views of an embodiment of the push button tuner according to the present invention, respectively, and lines BB and C-C in FIG. Longitudinal cross-sectional view along Figures 3 and 4
5 and 6 are perspective views of the slide cam plate of the push button tuner and its modified example, respectively. It is. 1,13 (13-1 to 13-5)...Push button rod,
2, 15...Sliding plate, 3, 17 (17-1, 17
-2)...Regulator, 4, 14...Slide cam plate, 4a, 14a, 14b, 14b'...V-shaped cam part, 4a-1, 14a-2, 14b-2...Right side of cam, 4a- 2, 14a-3, 14b-3...
Cam left side, 11...Push button tuner, 17-1a,
17-1b, 17-2a, 17-2b...Abutting cam portion, 19...Suppression plate, 20...Push button, 20a...
...Inhibition cam section, 22...core.

Claims (1)

[Scope of utility model registration request] A plurality of channel selection members, each of which can be slid in the front and rear directions on the frame and arranged at adjacent pitches P, have one left and right one, respectively.
A regulator having a pair of abutting cam portions is provided rotatably in a horizontal plane, and a slide cam member is arranged on the frame so as to be slidable in the left and right directions orthogonal to the above-mentioned front-rear direction. A substantially V-shaped cam part with a pitch of 2P from the top to the bottom is provided extending in the left-right direction, and the alternate V-shaped crests and V-shaped troughs of the V-shaped cam part are used to sequentially select a plurality of channels. A pair of symmetrical inclined cams, which correspond to the members, so that when the arbitrary channel selection member is pressed and slid, the pair of abutting cam portions of the regulator are located at either the V-shaped peak portion or the V-shaped valley portion. A push-button tuner configured to abut on each side and perform tuning tuning by regulating mutual positions between the regulator and the slide cam member.