JPS584334Y2 - Tuning shaft with vernier - Google Patents

Description

[Detailed description of the invention] The present invention relates to the invention of a tuning shaft with a vernier, which allows fine adjustment of the tuning operation in addition to normal tuning operation, in which the rotation of any one of the tuning operation shafts. This is designed to eliminate torsional stress during operation so that a desirable synchronized operation can always be obtained.

In cases where it is not possible to obtain highly accurate tuning due to the large amount of adjustment using a manual rotary shaft, a vernier that incorporates a separate fine adjustment shaft allows multiple rotations of this fine adjustment shaft to complete one rotation of the original adjustment shaft. The attached tuning axis has been known for a long time.

That is, such a conventional tuning shaft with a vernier has a structure as shown in FIG. At the same time, a sphere 3 is held in the middle part thereof, and the transmission part 5 of the fine adjustment shaft 4 inserted into the adjustment shaft 2 is connected to the sphere 3, and the tip of the fine adjustment shaft 4 is connected to the adjustment shaft 4. Hollow 6 of shaft 2
The fine adjustment shaft 4 is constantly urged to push outward by applying a spring 7 mounted therein, and the connection between the transmission part 5 and the sphere 3 is ensured, The adjustment shaft 2 acts to perform a coarse adjustment operation,
While a large amount of adjustment movement can be achieved by one rotation, the rotation by the fine adjustment shaft 4 causes the sphere 3 to roll, and the adjustment shaft 2 is rotated through this transfer of the sphere 3. One rotation of the adjustment shaft 2 is obtained by multiple rotations of the fine adjustment shaft 4.

However, in such a conventional tuning shaft with a vernier, since the spring 7 is interposed as described above, torsional stress remains on the spring 7 even when either the adjustment shaft 2 or the fine adjustment shaft 4 is rotated. If the grip for rotation is released after the adjustment operation, the torsional stress present in the spring 7 causes the shaft to rotate, which has the disadvantage of making it difficult to achieve accurate synchronization.

The present invention was developed through research to eliminate the disadvantages of the conventional ones as described above, and its specific embodiment is as shown in FIG.

That is, a cavity 6 is formed in an adjustment shaft 2 rotatably incorporated in an outer cylinder 1.
is formed into a cylindrical shape, and a sphere 3 is held in the middle part of such adjustment shaft 2, and the adjustment shaft 2 is held with respect to the sphere 3.
The transmission part 5 of the fine adjustment shaft 4 inserted therein is joined, and a spring 7 built in the hollow part 6 of the adjustment shaft 2 is interposed between the tip of the fine adjustment shaft 4 and the adjustment shaft 2. However, the action of the spring 7 always pushes out the fine adjustment shaft 4 and ensures the connection between the transmission part 5 and the sphere 3. In this case, in this invention, the spring 7 and the tip of the fine adjustment shaft 4 are A spherical part body 8 is interposed between them.

That is, in the illustrated embodiment, a spherical body 8 is used in which a protrusion 8b is integrally formed on the back side of a hemispherical joint surface 8a, so that an appropriate engagement relationship with the spring 7 can be obtained. In some cases, a simple sphere having an outer diameter larger than the inner diameter of the spring 7 may be fitted onto the end of the spring 7.

Further, a locking portion 14 such as a flange is formed on the base end side of the fine adjustment shaft 4 as described above, and the above-mentioned spring 7 is formed between the locking portion 14 and the base end of the adjustment shaft 2. Another spring 9 whose winding direction is reversed is inserted, and in order to ensure a preferable rotational operation of the adjustment shaft 2 and to insert such a spring 9, the spring 9 is placed on the proximal end side of the adjustment shaft 2. The spring receiving portion 12 is formed by recessing the spring receiving portion 12 therein.

According to the present invention as described above, normal tuning operation can be obtained by rotating the adjustment shaft 2, and fine adjustment via the sphere 3 can be achieved by rotating the fine adjustment shaft 4, resulting in highly accurate tuning. However, the springs 7 and 9 are used in the opposite direction to the winding direction, and in addition, the fine adjustment shaft 4 and the springs 7 are joined by a spherical body 8. Therefore, the torsional stresses of the springs during the rotational operation as described above are made to interfere with each other, thereby eliminating the return operation caused by the residual torsional stress after the rotational operation, and reducing the slip torque between the shafts 2 and 4. The present invention has such effects that it is possible to realize each of the above-mentioned tuning operations accurately and without any need for adjustment, and the feeling is good, and is a highly effective device in practical use.

[Brief explanation of the drawing]

The drawings show the technical content of the present invention, in which Figure 1 is a cross-sectional view of a conventional tuning shaft with a vernier, and Figure 2 is a cross-sectional view similar to Figure 1 of a tuning shaft with a vernier according to the present invention. be. However, in these drawings, 1 is an outer cylinder, 2 is an adjustment shaft,
3 is a sphere, 4 is a fine adjustment shaft, 4 is a transmission part, 6 is a hollow, 7 is a spring, 8 is a spherical body, 9 is a spring wound in the opposite direction to the spring 7, 1
Reference numeral 2 indicates a spring receiving portion, and reference numeral 14 indicates a locking portion.

Claims (1)

[Scope of utility model registration request] The adjustment shaft rotatably incorporated in the outer cylinder is made hollow and a fine adjustment shaft and a spring are housed therein, and the rotational operation of the fine adjustment shaft is transmitted to the adjustment shaft via a sphere joined to its transmission part. wherein a spherical body is not interposed between the end of the fine adjustment shaft and the spring, and between the locking portion formed on the fine adjustment shaft and the proximal end of the adjustment shaft. A tuning shaft with a vernier is characterized in that another spring whose winding direction is opposite to that of the spring mentioned above is interposed.