JPS6214124B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to an arm mechanism for a push button tuner.

(2) Prior art The push button tuner changes the fixed angle of the setting plate provided on the arm arm, changes the amount of movement of the memory slide pressed by the setting plate, and adjusts the memory. A desired frequency is selected by inserting the cores, which are interlocked with the slide, into predetermined positions within the tuning coil.

Incidentally, the applicant previously proposed a mechanism as shown in FIG. 1 as a means for fixing the setting plate on the arm arm at a desired angle in such a push button tuner.

That is, a setting pin 2 is fixed to the armrest 1, and a setting plate 3 is rotatably fitted around the setting pin 2. The setting plate 3 is composed of a teardrop-shaped member as a whole, with the distal end of the arm 1 having an arc shape and the proximal end of the arm 1 having a triangular shape. A pressing protrusion 4 of the memory slide is provided facing upward.

A substantially U-shaped plate spring 5 is provided on the upper surface of the armrest 1 so as to surround the setting plate 3. This plate spring 5 is fixed to the tip of the arm 1 at its tip side, and the left and right sides of the U-shape are shaped so as to sandwich the setting plate 3 from the left and right.
It is extended proximally. Further, an arcuate tightening portion 6 is formed on the inner surface of the tip of the plate spring 5, and this tightening portion 6 surrounds the tip side of the setting plate 3, which also has an arcuate shape. are in contact.

Further, a push button 7 is fitted to the base end of the armrest 1 and the left and right base ends of the plate spring 5 extending to this part. That is, this push button 7 is used to press the left and right proximal ends of the plate spring 5 from both sides when attached to the arm arm 1, thereby narrowing the gap between them, and when it is partially pulled out from the arm arm 1. When this happens, the pressing force on the plate spring 5 is released,
This makes it possible to widen the distance between the left and right pieces of the plate spring 5.

This type of armrest mechanism works as follows.

To set the frequency to be tuned by a given push button and its arm, manually rotate the tuning shaft in advance and move the core linked to this to a given position within the tuning coil. and select the frequency to be set using the push button. In this way, the memory slide 8 that is interlocked with the core moves laterally and is set at a position corresponding to the frequency to be set. In this state, the push button 7 attached to the armrest 1 and the base end of the plate spring 5 is partially pulled out to release the pressing force on the plate spring 5. Then, the tightening part 6 of the plate spring 5
A gap is created between the front part of the setting plate 3 and the setting plate 3, and the setting plate 3 can freely rotate around the setting pin 2.

After that, when the push button 7 and the armrest 1 are pushed into the tuner, the pressing protrusion 4 of the setting pin 2 comes into contact with the V-shaped notch 9 of the memory slide 8, and is guided by the slope of the V-shaped notch. Reach the top of notch 9. In this case, since the position of the apex of the V-shaped notch 9 is determined by the position of the memory slide 8 corresponding to the position of the core with respect to the tuning coil, the setting plate 3
is rotated about the setting pin 2 so that the position is at the apex of the V-shaped notch 9.

After adjusting the angle of the setting plate 3 to the position of the V-shaped notch 9 of the memory slide 8 in this way, push the push button 7 provided at the base end of the arm 1 further. 1 is memory slide 8
Since the push button 7 is prevented from moving forward, only the push button 7 slides on the arm arm 1 and is completely attached to the arm arm 1. In this case, the left and right base end portions of the plate spring 5 are pressed from both sides by the push button 7, thereby narrowing the distance between the left and right sides of the U-shaped plate spring 5, and pushing the front of the setting plate 3. It will be tightened strongly from the surrounding area. As a result, the setting plate 3 is fixed on the armrest 1 at an angle corresponding to the position of the V-shaped notch 9 of the memory slide 8.

Thereafter, when this push button 7 is pushed into the tuner, the pressing protrusion 4 of the setting plate 3 fixed to the arm arm 1 comes into contact with the V-shaped notch 9 and presses it, so that the memory slide 8 moves, and the insertion position of the core interlocked with this memory slide into the coil is determined.

(3) Problems with the prior art It is true that this type of arm mechanism fixes the setting plate 3 by applying pressure from the horizontal direction, so it is compared to a type in which the setting plate is pressed and fixed from above by a spring. This has the effect of reducing the thickness of the entire arm arm mechanism, which greatly contributes to making the push button tuner smaller and thinner. However, when this is adopted in an actual push button tuner, there are the following disadvantages. was caused.

That is, since the setting plate 3 needs to be rotatably attached to the inner periphery of the plate spring 5 that tightens it, a slight gap is formed between the two, and the setting plate and Due to the machining accuracy of the plate spring, it is inevitable that a gap will occur between the two.
Therefore, when locking the setting plate 3, the inner surface of the plate spring 5, which moves together with the arm arm 1, and the front end side of the setting plate 3, which is locked in the V-shaped notch 9 of the memory slide 8, The above-mentioned gap W appears between them. And this gap W is the plate spring 5
When the setting plate 3 is tightened by the forceps, it acts as a force to draw the setting plate 3 toward the distal end side of the armrest 1 (in the direction of arrow A in the figure).

That is, in the arm mechanism shown in FIG. 1, since the plate spring 5 that tightens the setting plate 3 is fixed to the arm at its tip, both the left and right sides of the plate spring 5 at the proximal end of the arm are fixed. When the setting plate 3 is tightened from the outside with the interval narrowed, the force acts from the proximal end to the distal end of the arm arm. In particular, this force is V
When the apex of the notch 9 is located away from the center of the arm 1 (the center of the setting plate 3) and the setting plate 3 is pulled in diagonally relative to the arm 1, the lateral direction It becomes a part of the force and works greatly.

As a result, the setting plate 3 pulled in by this force causes the memory slide 8 to move laterally from its original position. Then, the memory slide, which had been stopped at a position corresponding to a predetermined frequency before the setting plate was locked, shifts its position, and the fixing angle of the setting plate 3 relative to the arm arm 1 also shifts accordingly. When this push button is pressed, the frequency is tuned to a position that is shifted from the push button, which has the disadvantage of causing performance deterioration due to so-called frequency shift.

In addition, the arm arm mechanism shown in Fig. 1 uses a protrusion provided on a part of the push button as a means to open and close the plate spring to tighten the setting plate, or uses a protrusion on a push button made of synthetic resin due to frictional deformation. Therefore, a separate slide plate was required to interlock with the push button. This slide plate increases the number of parts in the entire arm arm mechanism, making the structure more complicated and the assembly work more troublesome.At the same time, the thickness of the arm arm mechanism as a whole increases, making the push button tuner smaller and thinner. There were also drawbacks that hindered development.

(4) Purpose of the Invention An object of the present invention is to prevent frequency deviations due to positional deviation of the memory slide when the setting plate is tightened by the plate spring, and to prevent the setting plate from being tightened by the plate spring. To provide a arm mechanism in a push button tuner that achieves high performance and is compact and thin, by which the above-mentioned functions can be performed without requiring a separate member such as a slide plate.

(5) Summary of the Invention The arm mechanism in the push-button tuner of the present invention includes a setting plate rotatably provided on the arm, and a plate spring with an open end side of the arm that is connected to the setting plate from both sides. The plate spring is placed on the arm arm so as to be sandwiched between the arms, and the plate spring is movable along the length of the arm arm together with the push button. This device has a configuration in which a protrusion is formed to tighten the setting plate by narrowing the interval between the parts, and by tightening the setting plate from the tip side of the arm arm, it prevents the memory slide from moving by the setting plate. In addition, by sliding the plate spring together with the push button, a separate member such as a conventional slide plate is not required.

(6) Embodiments of the Invention Next, embodiments of the present invention will be specifically explained with reference to FIG. 3 and subsequent figures.

(Structure) In this embodiment, a setting plate 21 is rotatably attached to approximately the center of the armrest 20. The setting plate 21 has a lacrimal shape with a pointed proximal end of the armrest 20, and a memory slide pressing protrusion 22 is provided upward at the proximal end. This pressing protrusion 22
is engaged with a V-shaped notch 24 of a memory slide 23 provided perpendicularly above the armrest 20. Further, a circular drum portion 25 that is concentric with the center of rotation of the setting plate 4 is integrally provided on the lower front surface of the setting plate 21.

A plate spring 26 with an open end side of the arm 20 is provided on the surface of the arm 20 so as to surround the drum portion 25 of the setting plate 21. That is, this plate spring 26
has a pair of left and right lever parts 26a and 26b extending parallel to the armrest 20, and this lever part 26
Openings are formed on the distal end sides of the arms 20a and 26a, while the proximal ends of the arms 20 on the lever parts 26a and 26a are integrated. A slide portion 26b having the same width as the diameter of the drum portion 25 of the setting plate 21 is provided in the gap between the lever portions 26a, 26a. The slide portion 26b is a slot-shaped opening extending along the length of the arm 20, and its length is set equal to the amount of movement of the plate spring 26 on the arm 20. This slide part 26
The proximal edge of the plate spring 26 at b is an arcuate tightening portion 26c that follows the outer shape of the drum portion 25.

The base end of the plate spring 26 is connected via a fixing pin 28 to a push button 27 that is slidably fitted into the base end of the armrest 20.

On the other hand, the tip of the lever portions 26a, 26a of this plate spring 26 has a lever portion 2.
6a, 26a so as to touch the outer edges of the protrusions 2
9 and 29 are provided. Lever part 26a, 2
6a, where the protrusions 29, 29 come into contact, there is a tapered part 26 where the tip end of the armrest is tapered.
d, 26d are formed. This tapered part 2
6d and 26d are formed from a contact position with the protrusion 29 when the plate spring is in the retracted position to a contact position with the protrusion 29 when the plate spring is advanced.

The distance between the outer edges of the left and right lever portions 26a, 26a is equal to or narrower than the distance between the left and right protrusions 29, 29 on the tip side of the arm arm than the tapered portions 26d, 26d. Ori,
Further, the proximal end side of the arms in the tapered portions 26d, 26d is wider than the distance between the left and right protrusions 29, 29.

(Function) The arm arm mechanism of this embodiment having such a configuration is as follows.
It works as follows.

First, to set a predetermined frequency for a certain push button, a manual tuning knob is used, and the push button tuner is set to a predetermined frequency. Then, the amount of lateral movement of the memory slide 23 is determined according to the frequency, and the apex of the V-shaped notch 24 provided in the memory slide 23 stops at a predetermined position in the width direction of the arm arm.

If the push button 27 is pulled out from the arm arm 20 in this state, the plate spring 26 connected to the push button 27 via the fixing pin 28 will also be removed from the arm arm 20.
Move 0 to the front. The movement of the plate spring 26 is regulated by the length of the slide part 26b because the edge on the tip side of the slide part 26b contacts the outer periphery of the drum part 25 of the setting plate 21. It stops when it is partially pulled out. Then, on the tip side of the plate spring 26, the left and right protrusions 29,
29 comes into contact with the narrow parts of the left and right lever parts 26a, 26a, so the lever part 26
The distance L between a and 26a becomes wide, so that the tightening force on the setting plate 21 is released, and the setting plate 21 can freely rotate on the armrest 20.

Next, when the push button 21 is pushed in and the arm arm 20 is advanced, the pressing protrusion 22 of the setting plate 21 is pressed.
moves along the oblique side of the V-shaped notch 24 of the memory slide 23, and finally the pressing projection 22 moves along the oblique side of the V-shaped notch 24 of the memory slide 23.
The position of the apex of the letter-shaped notch 24 is reached. and,
As the pressing protrusion 22 moves, the setting plate 21 rotates, and its angle is determined. In this case, the plate spring 26 has its tapered portions 26d, 26d connected to the left and right protrusions 29, 2.
9, it is impossible to move forward on arm arm 20, and the pressing force of push button 27 is transmitted to arm arm 20 via this plate spring 26, and arm arm 20 moves forward. .

After the rotation angle of the setting plate 21 is determined as described above, the push button 27 is pressed further. Then, the arm arm 20 cannot move any further because the setting plate 4 fixed thereto is engaged with the memory slide 23 via the pressing protrusion 22, and therefore the arm arm 20 cannot move forward any further. Only the spring 26 will move forward on the armrest 20. In this case, the plate spring 26 moves forward to a position where the arcuate tightening portion 26c provided at the proximal end of the slide portion 26b contacts the outer periphery of the drum portion 25. In this way, when the plate spring 26 moves forward on the armrest 20, the protrusions 29, 29, which were in contact with the narrow parts of the lever parts 26a, 26a, move from the tapered part 26.
d, 26d and lever parts 26a, 26a.
will come into contact with the narrow part of the

As a result, as shown in FIG. 4A, the lever portion 26
The distance l between a and 26a is narrowed, and the left and right lever portions 2
The inner edges of 6a, 26a and the arc-shaped tightening portion 26c tighten the drum portion 25 from the periphery, thereby fixing the setting plate 21 on the armrest 20.

The force when tightening the lever portions 26a, 26a is
Since the arm 20 is applied to the drum part 25 from the distal end side (see arrow B in the figure), in this embodiment, the setting plate 21 does not move toward the distal end side of the arm arm. There is no possibility that the memory slide 23 will be pulled in and move laterally, causing a frequency shift.

(7) Other Embodiments The present invention is not limited to the embodiments shown in the drawings. For example, the lever portions 26a, 26a may be
Instead of providing a tapered part on the side, Fig. 5 A, B
As shown in FIG. 2, the same effect can be obtained by providing the protrusions 29, 29 on the side of the armrest 20 with tapered portions 29a, 29a whose tips are tapered.

In addition, as a means for fixing the push button 27 and the plate spring 26, in addition to the separate fixing pin 28, a protrusion that engages with the plate spring 26 may be provided integrally on the push button 20 side, or a fixing point between the two may be used. is not limited to one place.

Furthermore, as a means for rotatably attaching the setting plate 21 to the arm 20, other than fixing a spindle to either the arm 20 or the setting plate 21 and providing a shaft hole in the other, there are other means for rotatably attaching the setting plate 21 to the arm 20. The drum part 25 formed at the lower part of the plate 21 may be extended downward and inserted into a large shaft hole formed on the arm arm 20 side.

Further, the pressing protrusion 22 and drum portion 25 formed on the setting plate 21 may be provided by fixing separate members to the setting plate main body, or may be formed entirely from a single member by means such as die casting. Also good.

(8) Effects of the Invention As described above, the arm arm mechanism of the present invention allows the plate spring to move on the arm arm together with the push button, and by opening the tip side of the plate spring, the setting plate is connected to the arm arm. Since it is tightened from the tip of the arm, when tightening the plate spring, there is no force acting to pull the setting plate toward the tip of the arm, and the setting plate is pulled into the arm and the memory is removed. This eliminates the risk of the slide moving. Therefore, according to the present invention, the memory slide does not shift its position when the setting plate is locked, and careless movement of the core slide or core that is linked to the memory slide is eliminated, and the frequency for the push button can be set accurately. This has the effect of making it possible.

Furthermore, since the push button and plate spring are moved together, there is no sliding part between the synthetic resin push button and the plate spring.
In addition to preventing wear and deformation of the push button, it also eliminates the need to provide a slide plate on the push button side to tighten the plate spring, which reduces the number of parts in the arm mechanism as a whole, making it smaller and thinner. be.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the arm mechanism of the push button tuner previously proposed by the applicant, Fig. 2 is an enlarged plan view illustrating the action of the setting plate and plate spring in the arm arm mechanism, and Fig. 3. and FIG. 4 show an embodiment of the arm arm mechanism of the present invention, in which FIG. 3A is a plan view in a state before the setting plate is tightened, FIG. 3B is a longitudinal sectional view of the same, and FIG.
FIG. 4A is a plan view of the setting plate when it is tightened, FIG. 4B is a longitudinal sectional view of the same as above, and FIGS. 5A and B are plane views showing other embodiments of the plate spring tightening means of the present invention. It is a diagram. 20... Bracelet, 21... Setting plate, 22... Pressing protrusion, 23... Memory slide, 24... V-shaped notch, 25... Drum section,
26...Plate spring, 26a...Lever part, 26b...Slide part, 26c...Tightening part,
26d... Taper part, 27... Push button, 28...
Fixing pin, 29...protrusion.

Claims (1)

[Claims] 1. A setting plate is rotatably provided on the arm arm, and a plate spring with an open end side of the arm arm is arranged on the arm arm so as to sandwich the setting plate from both sides, and this plate spring can be moved along the length of the arm together with a push button, and a protrusion is provided at the tip of the arm for tightening the setting plate by narrowing the gap between the openings at the tips when the plate spring moves forward. An arm mechanism for a push-button tuner characterized by: