JPS6128242Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a linear tracking arm oil dump device.

Conventionally, oil dump devices have been used as Q-dumps for low-frequency resonance of tonearms, but they are generally used with offset arms, and their structure is to provide an oil pot around the rotational axis of the tonearm to apply horizontal and vertical braking. Some were equipped with an arc-shaped oil pot located at a distance from the rotation axis to cover the horizontal rotation range of the arm. However, since these are all offset arms, their horizontal rotation width is large, and in order to make the oil pot smaller, they can only be placed within a small radius from the rotation axis.

As a result, the lever ratio between the pick-up head and the brake fin inserted into the oil pot becomes large, and conversely, the displacement speed of the brake fin is small, making it difficult to expect much of a braking effect. Also, if the oil pot is located far from the center of the rotation axis, the braking effect will be greater, but the horizontal rotation width will increase.
The oil pot has a huge arc shape.

As mentioned above, since the conventional oil dump device is for an offset arm, there are several drawbacks.

Therefore, the present invention provides an oil dump device for a linear tracking arm.The purpose of this invention is, firstly, to take advantage of the advantages of a linear tracking arm, that is, the horizontal rotation angle is a small angular displacement. Taking advantage of a certain point, a small oil pot is placed at a position where the displacement speed of the brake fin is large enough away from the arm rotation axis to improve the braking effect and simplify and downsize the structure. The second purpose is to provide a structure in which the oil pot is integrated with the elevation seat, and a brake fin is provided on the tone arm and inserted into the oil pot. This allows the tone arm to move up and down as the elevation seat rises and falls. by giving a braking effect to
Jumping of pick up head when ascending,
The purpose is to damp unnecessary vibrations such as lateral vibration of the head when descending.

Hereinafter, the present invention will be explained based on the embodiments shown in the drawings. Fig. 1 is a perspective view showing an oil dumping device for a linear tracking arm according to the present invention;
The figure shows a sectional view taken along the center line of the elevation seat of the same device.

In the above drawing, 1 is an arm holder, and 2 is a tone arm connected to the holder 1.Although not shown in the drawing, a weight is provided at the rear of the arm holder 1, and a head shell is provided at the front of the tone arm 2. It is being

3 is a side bar, and the side bar 3 is located near the arm holder 1 and is connected to the tone arm 2.
It is inserted so as to be slidable in a direction perpendicular to the axis of the arm 2, and is fixed by a fixing screw 4 screwed onto the tone arm 2 from above.

Reference numeral 5 denotes a dump adjustment shaft. The adjustment shaft 5 is located at the left end of the side bar 3 in the figure and is inserted with a screw structure so that it can move up and down.
A brake fin 6 is fitted and fixed to the lower end of the fin.

Reference numeral 7 denotes an arm base, and a linear tracking drive mechanism (not shown) is provided at the lower part of the arm base 7. Also, on the arm base 7,
The above-mentioned arm holder 1 is attached to the rear,
An elevation seat 8 for raising and lowering the tone arm 2 is disposed in front of the tone arm 2 so as to be movable up and down. An oil pot 9 filled with oil 9a is fixed on the elevation seat 8 directly below the brake fin 6, and the brake fin 6 is inserted into the oil 9a to control the displacement speed of the tone arm 2. Accordingly, an oil dumping effect is provided by changing the relative speed between the oil 9a and the brake fin 6. A cap 10 prevents dust from entering the oil pot 9, and is fixed to the oil pot 9 with a screw 11. Reference numeral 12 denotes an elevation chip fixed to the lower part of the tone arm 2, which can freely come into contact with the elevation sheet 8.

Next, the operation of the above embodiment will be explained.

First, while playing a record, the elevation sheet 8 is stationary in contact with the surface of the arm base 7, and the brake fin 6 changes according to the displacement speed of the tone arm 2, and the oil 9a Creates a dump effect. Further, when the dump adjustment shaft 5 is rotated, the brake fin 6 moves up and down, and as a result, the contact area of the brake fin 6 with the oil 9a changes, so that the amount of oil dump can be adjusted.

Next, in the process of the elevation seat 8 rising from the lowered position, the oil pot 9 also rises until the elevation seat 8 comes into contact with the elevation chip 12, and the area of the brake fin 6 immersed in the oil 9a increases. However, if unnecessary displacement speed does not occur in the tone arm 2 itself, there is no problem in operation. Furthermore, until the elevation sheet 8 rises and comes into contact with the elevation chip 12 and the elevation is completed, the tone arm 2 is lifted and supported by the elevation chip 12, and there is no operational problem as described above. Therefore, during this rise, if the rise time is fast, the tone arm 2 after rising
This overshoot (jumping) can be damped by the oil dump effect due to the generation of relative speed between the brake fin 6 and the oil 9a. On the other hand, in the process from rising to falling, the lateral vibration of the tone arm 2 when the stylus tip contacts the record surface can be damped by the same oil dump effect as described above.

As mentioned above, the present invention consists of a linear tracking tone arm 2, a brake fin 6 connected to the arm 2, and an oil pot 9 integrally provided on the elevation seat 8 that raises and lowers the tone arm 2. , connect the above brake fin 6 to the oil pot 9.
This is inserted into oil 9a filled with water. Therefore, the oil pot 9 can be installed at a sufficient distance from the rotation axis of the tone arm 2 and at a position where the displacement and speed change is large, thereby improving the braking effect.
The structure can be made smaller. Also, an elevation seat 8 for raising and lowering the tone arm 2
By providing the oil pot 9 on the top, it is possible to give a braking effect to the lifting motion and damp unnecessary vibrations such as jumping when going up and lateral vibration when going down.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a linear tracking arm oil dump device according to the present invention, and FIG. 2 is a longitudinal sectional view of the same device. 1...Arm holder, 2...Tone arm, 3
... Side bar, 5 ... Dump adjustment shaft, 6 ... Brake fin, 7 ... Arm base, 8 ... Elevation seat, 9 ... Oil pot, 9a ... Oil.

Claims (1)

[Claims for Utility Model Registration] (1) Consisting of a linear tracking tone arm, a brake fin connected to the arm, and an oil pot integrally provided on the elevation seat that raises and lowers the tone arm, A linear tracking arm oil dump device characterized by a braking fin inserted into oil filled in an oil pot. (2) The linear tracking arm oil dump device according to claim 1 of the utility model registration, wherein the brake fin is provided with a dump adjustment shaft, and the brake fin is moved up and down by rotating the adjustment shaft. . (3) Attach the sidebar to the linear tracking tone arm so that it can be moved left and right.
An oil dumping device for a linear tracking arm according to claim 1 or 2, wherein a brake fin is attached to the side bar.