JPS5822244Y2 - Vertical player pick-up - Google Patents

Description

[Detailed description of the invention] This invention relates to a pickup for a vertical player that is equipped with a lightweight zero balance adjustment mechanism and an easy-to-operate stylus pressure application adjustment mechanism so that the record player can be used vertically. .

FIG. 1 is a side view of a conventional vertical player.

In this figure, 1 is a cabinet, 2 is a turntable, and 3 is a record.

4 is a horizontal shaft bearing provided in the cabinet 1; 5 is a horizontal shaft;
6 is a vertical axis; T is a holder for fixing the vertical axis 5 and the vertical axis 6;
8 is a stylus pressure guide shaft with a stylus pressure scale engraved on it, 9 is a stylus pressure weight, 10 is a pipe-shaped tone arm, 11 is a helad shell, 12 is a cartridge, 13 is a needle, 14 is a bearing tool, and the vertical axis bearing (not shown), stylus pressure guide shaft 8, and tone arm 1
0 is fixed and rotatably supported by a vertical shaft 6 with respect to the holder T.

These components constitute a pickup 15.

Note that G is the center of gravity of the pickup 15.

Generally, when reproducing the record 3, it is necessary to apply appropriate stylus pressure to the stylus 13.

Particularly in the case of a universal pickup, if the head shell 11 or cartridge 12 is changed, the tracking performance will be adversely affected unless the stylus pressure is adjusted.

The procedure for applying stylus pressure is to first perform what is commonly called a 6-zero balance adjustment.

Then, the center of gravity G of the pickup 15 is moved by moving the stylus pressure weight 9 so that a straight line A connecting the fulcrum P and the center of gravity G becomes parallel to the surface of the record 3.

Next, the stylus pressure weight 9 is moved by a predetermined amount in the direction of arrow B with the attached cartridge 12 outside the desired stylus pressure, thereby breaking the balance and applying force to the needle 13, thereby completing the stylus pressure adjustment operation.

Therefore, the weight of the head shell 11 and cartridge 120,
The weight of the stylus pressure weight 90, the length of the stylus pressure guide shaft 8, the position with respect to the fulcrum P, etc. must be determined by assuming the source case depending on the combination of the center of gravity position and the required stylus pressure of the cartridge 12.

In a pickup structured as described above, in which the stylus pressure weight 9 is moved along the stylus pressure guide shaft 8 to perform zero balance adjustment and stylus pressure application adjustment, the stylus pressure weight 9 is moved when performing zero balance adjustment. When adjusting the stylus pressure application, use the stylus pressure guide shaft 8 and the stylus pressure guide shaft 9 when the stylus pressure is zero.
The positional relationship changes depending on the type of head shell 11 and cartridge 12. Therefore, after converting the stylus pressure scale engraved on the stylus pressure guide shaft 8 to zero, the stylus pressure weight is adjusted in the direction of arrow B by the required stylus pressure. 9 needed to be moved.

In addition, in such a pickup 15, it is necessary to add enough weight to the stylus pressure weight 9 to adjust the zero balance in order to compensate for variations in the head shell 11 and the cartridge 120. Ta.

For this reason, both masses as seen from the stylus 13 of the pickup 15 will inevitably increase, deteriorating the tracking performance, and when used in conjunction with a high compliance cartridge, the arm resonance frequency will shift to a band with many noise components such as warping of the record 3. In the past, there were drawbacks such as a decrease in the quality of the signal, leading to the occurrence of cross-modulation distortion.

This invention was made in order to eliminate the above-mentioned drawbacks, and aims to provide a lightweight zero balance adjustment mechanism and an easy-to-operate confining pressure application adjustment mechanism.

This idea will be explained below.

FIG. 2 is a side view showing an embodiment of this invention, FIG. 3 is a side view taken along line C--C of portion D in FIG. 2, and FIG. 4 is a side sectional view.

In these figures, numerals 1 to 13 are the same parts as in the conventional device shown in FIG.

16 is a bearing A, 17 is a vertical shaft bearing, and 18 is a bearing B that fits into the vertical shaft bearing 1T and contacts the vertical shaft 6.
9 is a signal lead wire, 20 is a set screw, 21 is an adjustment screw that also serves as a stylus pressure guide shaft, and 22 is a coil spring.

23 is a housing having a long hole through which the vertical shaft 6 passes, a long hole through which the set screw 20 passes, a screw hole through which the adjustment screw 21 passes, and a collar for fixing the tone arm 10; 24, the signal lead wire 19 passes through the housing; Housing 23 with a hole
It is a lid that is fixed to the

In the vertical player configured as described above, □ To perform zero balance adjustment of the pickup, loosen the set screw 20 so that the housing 23 can slide relative to the vertical shaft bearing 1T, rotate the adjustment screw 21, Move the housing 23 in the direction of arrow E.

As a result, since the tone arm 10, head shell 11, and cartridge 12 are connected to the housing 23,
The position of the center of gravity G moves with respect to the fulcrum P, and the straight line A connecting the fulcrum P and the center of gravity G can be easily made parallel to the three surfaces of the record.

Thereafter, the housing 23 is fixed to the vertical shaft bearing 11 by tightening the set screw 20.

In the above embodiment, the center of gravity G of the pickup 15 was slid with respect to the fulcrum P by sliding the housing 23 on the vertical axis bearing 17. A similar operation can be expected by rotating the vertical axis linked to the .

This will be explained below. 5 to 9 show other embodiments of means for moving the center of gravity of the pickup relative to the support, and FIG. 5 is a side view of a vertical pickup;
Fig. 6 is an enlarged top view of part F of Fig. 5, partially cut away;
Figure 7 is an enlarged front view of part F in Figure 5 with a part cut away;
FIG. 8 is an enlarged sectional view of portion F in FIG. 5, and FIG. 9 is a similar enlarged sectional view when the center of gravity is moved.

In these figures, the same reference numerals as in Figures 2 to 4 indicate the same parts, 25 is a V-groove holder 26 is an adjustment screw, 2T is a set screw, 28 is a vertical shaft bearing, and 29 is a fixed screw. piece,
30 is a knife-shaped vertical shaft; 31 is a housing for fixing the tone arm 10 and having screw holes for an adjustment screw 26 and a set screw 27;

According to this embodiment, a bearing for the bearing is not required, and the manufacturing of the bearing part becomes simple.

As explained above, when zero balancing a pickup, this idea uses a simple structure that moves the center of gravity relative to the fulcrum position, rather than moving the weight to move the center of gravity. Therefore, the stylus pressure application adjustment can always be started from the zero position on the application amount scale, making the operation easy, and since the weight can be reduced, there are effects such as improved tracking performance and distortion characteristics.

[Brief explanation of drawings]

Fig. 1 is a side view showing a conventional vertical player, Fig. 2 is a side view showing an embodiment of this invention, and Figs.
A sectional view and a side sectional view of the pickup part in the figure,
FIG. 5 is a side view showing another embodiment of this invention, and FIGS.
FIG. 9 shows details of the pickup section in FIG. 5, and FIG. 6 is an enlarged top view showing a part of F section cut away.
Figure 7 is an enlarged, partially cutaway view, and Figure 8
The figure is also an enlarged sectional view, and FIG. 9 is an enlarged sectional view when the center of gravity is similarly moved. In the figure, 1 is a cabinet, 4 is a horizontal axis bearing, 5 is a horizontal axis, and 6
is a vertical axis, 7 is a holder, 10 is a tone arm, 14 is a bearing part, 17 is a vertical axis bearing, 18 is a bearing B, 20 is a set screw, 21 is an adjustment screw, 22 is a coil spring, 2
3 housing, 24 is a lid. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (4)

[Scope of utility model registration request] (1) A pickup for a vertical player having a holder pivotably supported on a cabinet so as to be rotatable in the direction of sound groove feeding on a record, and a tone arm rotatably supported by the holder in the direction of applying stylus pressure, A pickup for a vertical player, comprising means for adjusting a fulcrum of the tone arm relative to the holder. (2) The vertical player according to claim 1, wherein the means for adjusting the fulcrum includes a tone arm slidably fixed to a bearing rotatably supported by the holder. pick up. (3) The means for adjusting the fulcrum includes slidably attaching a housing to which the tone arm is attached to a bearing rotatably supported by a holder, interposing a spring between the bearing and the Ujifugu, and The pickup for a vertical player according to claim 1, wherein the housing is provided with an adjustment screw that moves the housing relative to the bearing in cooperation with the spring by moving forward and backward. (4) The means for adjusting the fulcrum is such that the tone arm is attached to the holder via a support that allows the support point of the tone arm to move relative to the holder through circular arc movement;
A vertical player pickup according to claim (1) of the utility model registration.