JPS581844Y2 - Tone Arm No Hojiyo Weight Toritsuke Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for attaching an auxiliary weight to a tone arm in a record player, which auxiliarily adjusts the stylus pressure of the tone arm by attaching the counterweight to the shaft.

As is well known in the art, the stylus force of the record stylus when playing a record affects the quality of the reproduced sound, and for this purpose a counterweight is attached to the tone arm, and the position of this counterweight is moved. The stylus pressure is adjusted by adjusting the stylus pressure.

On the other hand, when a heavy head shell is attached to the tone arm, the weight of the counterweight alone may be insufficient, making it impossible to adjust the stylus pressure. In such cases, an auxiliary weight is attached.

However, the structure of the conventional auxiliary weight mounting structure is as shown in FIG. A female thread 3 is cut on the inner circumference of the shaft hole on the opening side of the other end, and a male thread 5 is cut on the outer circumference of a small diameter guide shaft integrally formed on one side of the auxiliary weight 4.
The auxiliary weight 4 was attached to the shaft 2 by screwing the male screw 5 into the female screw 3.

Note that 6 in the figure is a counterweight attached to the outer periphery of the shaft 2.

In such a conventional structure, if the screws are not fully tightened or if the screws become loose during use, twitching tends to occur during performance, resulting in a significant lack of reliability.

In addition, since the shaft 2 is usually made of light metal,
The female screw 3 tends to wear out due to long-term use and lacks durability.

Furthermore, there were other problems such as difficulty in quickly attaching and detaching the auxiliary weight 4.

On the other hand, it has recently become popular among stereo enthusiasts to convert the head shell to match the song on the record (the one most suitable for the song), and the head shell is frequently replaced.

At this time, the auxiliary weights will naturally be attached and detached frequently, but in the conventional structure as described above,
This was not a desirable structure, as it not only lacked quick response in such cases, but also accelerated the wear of the screws, shortening their lifespan.

The present invention was devised to correct the above-mentioned deficiencies, and includes an auxiliary weight attachment for a tone arm that is durable, easy to attach and detach, is easy to position, and prevents tingling. intends to provide the equipment.

Next, an embodiment of the present invention will be described based on FIGS. 2 to 10.

FIG. 2 is a plan view showing an example of the record player 20, and 21 is its frame.

A turntable 22 is disposed at the center of the frame 21, and a tone arm 23 is placed on the right side around the turntable 22 via an arm support block 24.

Further, a function panel 25 is attached to the right front portion, and these are provided with a record size adjustment knob 26, a power supply and mode changeover switch, and the like.

Furthermore, speed switching knobs 27, 28, speed fine adjustment knobs 29, 30, a strobe lamp 31, etc. are provided on the left front portion.

Furthermore, a pair of left and right head shell stands 32 and the like are provided at the rear position.

As is conventionally known, a head shell 34 is detachably attached to the tip of the tone arm 23, and one end side of a shaft 35 is connected to the opposite side of the head shell 34, and the shaft 35 is connected to the opposite side of the head shell 34. A counterweight 36 is attached to the outer periphery of the weight 35, and an auxiliary weight 37 is detachably attached to the other end.

Next, the structure of the attachment of the auxiliary weight 37 to the shaft 35 will be explained.

First, FIGS. 3 and 4 show the auxiliary weight 37, which is molded from a metal member, and has a small-diameter guide shaft 37a in the center of its side surface.
is integrally molded.

Note that an annular recess 40 is formed on the outer peripheral surface of this guide shaft 37a.

A rubber member 38 is attached to the outer periphery of this guide shaft 37a.

Note that this rubber member 38 is composed of a cylindrical portion 38a that is inserted into the outer periphery of the guide shaft 37a, and a flange portion 38b that is integrally connected to one end of the cylindrical portion 38a. The cylindrical portion 38a is fitted into the recess 40 of the guide shaft 37a by inserting the guide shaft 37a until the end of the guide shaft 37a.
Further, the flange portion 38b abuts one side of the auxiliary weight 37.

Further, on the outer circumferential surface of the cylindrical portion 38a of the rubber member 38, four convex shapes 39 are integrally formed at four equal positions in the circumferential direction, and are formed integrally in the axial direction. The tip end surface is formed into a slope 39a, and the other end side is formed with a flange m38b.
A slope 39b is also formed at the base of the base.

Next, the manner in which the auxiliary weight 37 is attached to the shaft 35 will be explained based on FIGS. 5 and 6.

Note that in this installation, the shaft 35 is formed in a hollow shape as in the conventional case.

This attachment is performed by attaching the cylindrical portion 38a of the rubber member 38 to the open end of the shaft hole 35 that opens on the other end side of the shaft 35, as described above.
is inserted into the outer periphery of the guide shaft 37a of the auxiliary weight 37, and the flange portion 38b of the rubber member 38 is in contact with one side of the auxiliary weight 37.Then, the tip of the guide shaft 37a of the auxiliary weight 37 is pressed against it. When the cylindrical portion 38a is pushed into the shaft hole 35a, the four protrusions 39 are guided by the slopes 39a, and the mounting is press-fitted into the shaft hole 35a of the shaft 35 against its elasticity. With shaft hole 3
It is crimped onto the inner circumferential surface within 5a.

When the auxiliary weight 31 is pushed in as much as possible in this manner, the flange portion 38b is attached to the end surface 35 of the shaft 35.
The attachment is performed by positioning the auxiliary weight 37 with respect to the shaft 35 by elastically abutting it on the shaft 35.

It should be noted that at the time of press-fitting, the rubber member 38 is attached to the inner peripheral surface of the shaft hole 35a of the shaft 35 by only the surfaces of the four protrusions 39, so that the rubber member 38 is in a so-called partially crimped state, so the frictional resistance during this press-fitting is small. It is very easy to press fit.

If the auxiliary weight 37 attached in this manner is not needed, it can be easily removed by simply pinching it and pulling it rearward.

Next, the situation in which the head shell 34 is stored will be explained based on FIGS. 9 and 10.

As mentioned above, the head shells 34 are exchanged according to the music being played, and for this reason, it is popular among stereo enthusiasts to prepare a plurality of head shells 34 and use them while exchanging them at any time. ing.

Conventionally, these large numbers of herad shells 34 were stored in a predetermined storage box to prevent the needle tips and the like from being damaged, and were taken out as needed.

However, there are many blank areas on the frame 21 of the record player 20, and it is extremely convenient to use these blank areas to store the head shell 34.

That is, there is no need to open and close the storage box every time the head shell 34 is replaced, and stereo enthusiasts may also want to show off the head shell 34 they have, which can be satisfied.

For this purpose, the above-mentioned helad shell stand 32 is formed in a blank space on the frame 21.

On the other hand, a plug 34a for inserting and fixing the head shell into the tone arm 23 is formed at one end of the head shell 34, and a guide pin 34b for guiding insertion is set at right angles on the upper surface of the plug 34a.

In order to fix the head shell 34 configured in this way in, for example, the head shell stand 32, the plug 34 is
All you need to do is insert a.

By engaging the guide pin 34b with one of the pair of notches 33, the head shell 34 will not rotate or fall down.

As a result, the head shell 34 is stored upright on the frame 21 as shown in FIG. 9.

Furthermore, when using the herad shell 34, it can be removed by simply pulling it upward, which is very convenient.

On the other hand, the auxiliary weight 37 tends to lose powder when not in use, so it is convenient to have a predetermined storage location.

For this purpose, the guide shaft 37a of the auxiliary weight 37 is made in a shape that can be inserted into the head shell stand 32 described above.

That is, as shown in FIGS. 7 and 8, the auxiliary weight 3
Insert the guide shaft 37a of No. 7 into the head shell stand 32.

At this time, two of the four protrusions 39 facing each other are
A pair of notches 3 formed in the head shell stand 32
3, and conversely, the other two protrusions 39 are elastically pressed against the inner surface to hold the auxiliary weight 37 so that it does not vibrate.

Therefore, the auxiliary weight 37 is always stored in a predetermined position and does not cause unnecessary vibration, making it extremely convenient to use.

In addition, by making the head shell stand 32 double as a stand for the auxiliary weight 37 in this way, functionality is increased and there is no need to provide a stand exclusively for the auxiliary weight, making the structure and processing simple and low cost. This has the advantage that the space of the frame 21 can be used effectively.

In summary, the device for mounting the auxiliary weight on the tone arm of the present invention is as follows: (a) The counterweight mounting device is connected to the tone arm at one end and has a shaft hole opening at the other end. (b) - an auxiliary weight having a small-diameter guide shaft inserted into the shaft hole from the opening on a side surface; (c) a cylindrical portion inserted into the outer periphery of the guide shaft; and (c) a cylindrical portion that is integrally connected to one end of the cylindrical portion. the cylindrical portion of the elastic member is inserted into the outer periphery of the guide shaft of the auxiliary weight, and the flange portion of the elastic member is brought into contact with one side of the auxiliary weight. When the guide shaft of the auxiliary weight is pushed into the shaft hole of the shaft, the cylindrical portion is pressed against the inner circumferential surface of the shaft hole, and the flange portion is attached to the mounting is characterized in that it is configured to elastically abut against the end surface of the shaft.

As a result, the present invention has the following advantages.

■The cylindrical part of the elastic member inserted into the outer periphery of the guide shaft of the auxiliary weight (counterweight) is attached by crimping the inner circumferential surface of the shaft hole. The mounting is durable because the internal threads of the shaft do not wear out due to long-term use as in the conventional case, and the auxiliary weight can be attached and detached from the shaft extremely easily and quickly.

■When the flange of the elastic member is in contact with one side of the auxiliary weight, when the guide shaft of the auxiliary weight is pushed into the shaft hole of the shaft, the flange is mounted elastically against the end surface of the shaft. Since the two parts are brought into contact with each other, it is necessary to simply push the parts in as far as possible, so that positioning is simple and the parts can be mounted stably and accurately in a predetermined position.

■In addition, the flange part of the elastic member is interposed between the end face of the shaft and one side of the auxiliary weight, and the shaft and the auxiliary weight are elastically coupled via the cylindrical part of the elastic member. Combined with this, minute vibrations from the tone arm are reliably absorbed by the elastic member without being transmitted to the auxiliary weight, and the auxiliary weight does not tremble.

Even if vibration occurs, since the flange of the elastic member is interposed between the end face of the shaft and one side of the auxiliary weight during installation as described above, the noise due to vibration will not be generated, and the vibration will not resonate. is suppressed.

(2) Furthermore, since the shaft and the auxiliary weight are securely connected to each other by crimping based on the elastic member, there is no problem of loosening.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main parts showing the state of conventional auxiliary weight attachment. 2 to 10 show examples of the present invention,
Figure 2 is a plan view of the record player, Figure 3 is an enlarged cross-sectional view to explain the shape of the auxiliary weight, Figure 4 is a sectional view taken along the line X-X in Figure 9, and Figure 5 shows the auxiliary weight as a counter. The weight single row is a sectional view of the main part to explain how it is attached to the shaft, Figure 6 is an enlarged sectional view taken along the line Vl-Vl in Figure 5, and Figure 1 is the auxiliary weight inserted into the head shell stand and fixed. 8 is a sectional view taken along the line X-X in FIG. 9, FIG. 9 is a perspective view showing the state in which the herad shell is inserted into the head shell stand, and FIG. 10 is a sectional view taken along the line X-X in FIG. 9.
It is an X-ray cross-sectional view. In addition, in the symbols used in the drawings, 23 is the tone arm, 35 is the shaft for mounting the counterweight, 35a is the shaft hole,
35b is an end surface, 37 is an auxiliary weight, 38 is a rubber member,
38a is a cylindrical portion, and 38b is a flange portion.

Claims (1)

[Claims for Utility Model Registration] (a) A counterweight whose one end is connected to the tone arm and has a shaft hole opening at the other end is attached to the shaft; An auxiliary weight having a small-diameter guide shaft inserted from the opening; (c) a cylindrical part inserted into the outer periphery of the guide shaft; and a flange part integrally connected to one end of the cylindrical part. and a cylindrical part of the elastic member is inserted into the outer periphery of the guide shaft of the auxiliary weight, and the flange part of the elastic member is in contact with one side of the auxiliary weight, and then the auxiliary weight is mounted. When the guide shaft of the auxiliary weight is pushed into the shaft hole, the cylindrical portion is pressed against the inner peripheral surface of the shaft hole, and the flange portion elastically contacts the end surface of the shaft. A tone arm auxiliary weight mounting device characterized by being configured so that they touch each other.