JPS6232330Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a record stylus adjustment system that allows the user to easily fine-tune the drop position of the record stylus onto the record when a cartridge, that is, a record stylus is attached to the tone arm. Regarding equipment.

Generally, with a turntable set, when the user presses the start button after selecting the record size, the record needle automatically falls to a predetermined position on the record and starts playing. Cartridges are often used, and in this case, depending on the way the cartridge is installed or the type of cartridge, the record stylus may fall inside the specified position and not play the song from the beginning, or may fall outside and cause the record stylus to drop. It may cause injury.

This invention was made in order to eliminate the above-mentioned drawbacks, and next, this invention will be explained in detail with reference to a drawing showing one embodiment thereof.

First, Fig. 1 is a perspective view showing the appearance of the turntable set, in which 1 is the set base, 2 is the turntable, 3 is the tone arm, 4 is the weight, and 5 is the turntable set.
is a rotation mechanism that supports the tone arm 3 so that it can swing up and down, and is rotatably supported on the set base 1 by a shaft that will be described later. 6 is provided on the front of the set base 1, and the record size 7'' (17
cm), 10'' (25cm), and 12'' (30cm). Disk size buttons 7 are provided on the front of the set base 1 for start/stop, rotation speed setting, and CUE.
An operation button 8 for operation, etc. is an adjustment knob provided on the top surface of the set base 1 at an easy-to-operate position.

Figures 2 and 3 are a bottom view and a front view showing the mechanism in which the record size is selected and the record stylus drops to a predetermined position, and Figure 4 is a side view showing the CUE mechanism that moves the tone arm up and down. , 9 is an output shaft of a motor (not shown), 10 is a drive gear pivotally attached to the output shaft 9, and 11 is rotatably supported around a large gear shaft 18 fixed to the chassis 17 and connected to the drive gear 10. This is a large gear that meshes with the large gear 1.
A groove 12 having a cam structure is formed on the lower surface of the groove 1, and an upper and lower step as shown in FIG. 3 is formed on the inner bottom surface of the groove 12.

Reference numeral 13 designates a seesaw lever that is rotatably supported around the shaft 15 of the chassis 17 and has a detection shaft 14 at one end engaged with the groove 12 of the large gear 11;
In response to the rotation of the large gear 11, the seesole lever 13 rotates about the shaft 15 clockwise or counterclockwise on the plane of the drawing, and due to the vertical difference in the groove portion 12, the seesole lever 13 performs seesaw movement, that is, the seesole lever 13 and other parts The end moves up and down. At the other end of the seesaw lever 13, a brake shoe 16 which can be pressed into contact with a size determining lever, which will be described later, is supported, and an elevating section 13' for raising and lowering an arm lifter, which will be described later, is integrally provided.

20 is a shaft rotatably supported by the chassis 17 and supports the rotation mechanism 5 of the tone arm 3; 19 is a size determining lever integrally provided at the lower end of the shaft 20; , locking edges 7'', 10'', and 12'' corresponding to record sizes 7'', 10'', and 12'', respectively, are formed so as to be located on different circumferences around the shaft 20. This size determination lever 19
The brake shoe 16 is located directly below the brake shoe 16, and the seesaw movement of the seesaw lever 13 brings the brake shoe 16 into pressure contact with the size determining lever 19.
When the seesaw lever 13 rotates in this state, this rotational force is transmitted to the size determining lever 19 via the brake shoe 16, the lever 19 rotates together with the shaft 20, and the tone arm 3 similarly rotates. do.

22 is a shaft 21 fixed to the chassis 17
a size adjustment lever rotatably supported by 32;
2 is a rotating body provided at the tip of the lever 22;
7 is an eccentric pin implanted at an eccentric position of the rotating body 32; 33 is a size adjustment rod that moves in the axial direction according to the size selection of the disk size button 6;
The insertion portion 22' of the base piece of the lever 22 is inserted into the rod 33.
At the same time, the stopper portion 33' of the rod 33 restricts the sliding position of the insertion portion 22', that is, the clockwise rotation range of the lever 22, making it easy to select the size. The corresponding movement position of the rod 33 allows the lever 22 to pivot to a position in which the eccentric pin 27 at its tip can be locked in the locking edge 7'' or 10'' or 12'' of the sizing lever 19.

Reference numeral 23 designates a control lever that is rotatably supported around a shaft 25 fixed to the chassis 17 and biased to rotate counterclockwise by a spring 34;
The lever 23 and the base piece of the size adjustment lever 22 are connected by a spring 24, and the control lever 2
The size adjustment lever 2 is rotated counterclockwise in 3.
2 rotates clockwise while contacting the stopper portion 26 of the control lever 23. This control lever 23
For example, the end edge thereof comes into contact with a cam surface on the circumferential surface of the large gear 11 by the urging of the spring 34, and rotates in accordance with the timing of rotation of the large gear 11.

Reference numeral 30 designates an arm lifter which is provided on the upper surface of the set base 1 so as to be movable up and down, and whose length corresponds to the rotation angle of the tone arm 3. The vertical movement shaft 30' of the lifter 30 passes through the chassis 17. At the same time, a piston shaft 28 integral with the lower end thereof is brought into contact with the elevating portion 13' of the seesaw lever 13 by the urging force of a spring 29. 36 is Laura,
The CUE mechanism consists of a cueing slide, a cueing lever, etc., and is operated by operating the operation button 7 for CUE operation.
performs up and down movements.

Next, in FIGS. 5 and 6 showing the main parts of this invention, 31 is a flexible spring coil that connects the adjustment knob 8 and the rotating body 32 of the size adjustment lever 22, and one end of the coil 31 is It is coaxially fixed to the knob shaft 8' of the adjustment knob 8, and the other end of the coil 31 is connected to the rotating body 32.
The rotation of the knob 8 rotates the rotating body 32 via the coil 31.
The position of the eccentric pin 27 with respect to the center of 2 changes.

Next, the operation of the embodiment will be explained.

After selecting the size of the record using the disk size button 6, when the start operation button 7 is operated, the motor drives the large gear 11 through the output shaft 9 and the drive gear 10 to rotate in the direction of arrow A shown in FIG. The seesaw lever 13, which is engaged with the groove 12 of the large gear 11 via the detection shaft 14, first rotates counterclockwise around the shaft 15, and then rotates clockwise.

At this time, the brake shoe 16 of the seesaw lever 13 comes into pressure contact with the size determining lever 19 due to the upper and lower steps of the groove 12, and moves in the direction of arrow B in FIG. Move like this. This brake shoe 16
When moving in the direction of arrow C, the size determining lever 19 pressed against the size determining lever 19 is rotated counterclockwise around the shaft 20, and along with this, the tone arm 3 is rotated via the shaft 20 and the rotation mechanism 5. move.

On the other hand, when the large gear 11 rotates, the large gear 11
When the control lever 23 reaches a predetermined rotational position, the control lever 23 rotates counterclockwise according to the bias of the spring 34, and the size adjustment lever 2, which is connected to the control lever 23 via the spring 24 and the stopper part 26, rotates counterclockwise.
2 rotates clockwise around the shaft 21, and the eccentric pin 27 at the tip thereof is placed at a position corresponding to the set record size, that is, the size determining lever 19.
It is located on the same circumference as the locking edge 7'' or 10'' or 12'' in the stopper.

Therefore, the size determining lever 19, which has been rotated counterclockwise due to the movement of the brake shoe 16 in the direction of the arrow C, is moved to either of the locking edges 7'',
10'' and 12'' come into contact with the eccentric pin 27 and stop rotating, and the tone arm 3 interlocked with this stops the record stylus at the tip of the record stylus at a performance start position corresponding to the record size. Note that the seesaw lever 13 continues to rotate in accordance with the rotation of the large gear 11 even after the size determining lever 19 contacts the eccentric pin 27, but at this time, the brake shoe 16 slips on the surface of the size determining lever 19. do.

Furthermore, after that, the seesaw lever 13 performs seesaw movement due to the vertical step difference in the groove portion 12 of the large gear 11, and the brake shoe 16 moves downward to remove the pressure contact with the size determining lever 19. At this time, the seesaw lever 13 moves up and down. Since the portion 13' similarly moves in the direction of arrow D in FIG. 4, that is, downward, the piston shaft 28 is lowered in the direction of arrow D by the spring 29, and the arm lifter 30 held by the piston shaft 28 also moves downward. ,
The tone arm 3 falls onto the record and enters the playing state.

By the way, when a user selects a cartridge, that is, a record stylus, to the tone arm 3, the position of the stylus may be displaced due to installation differences, cartridge differences, etc. In this case, the adjustment knob 8 If the rotating body 32 is rotated through the flexible spring coil 31 by rotation adjustment, the position of the eccentric pin 27 with respect to the center of the rotating body 32 changes, so that the locking edges 7'', 10'', 12'' of the size determining lever 19 Eccentric pin 27
The position of contact with the tone arm 3 changes, and the fall position of the record stylus on the tone arm 3 can be adjusted. Inconveniences such as injury can be avoided.

As described above, according to the record stylus adjustment device of this invention, in a record stylus adjustment device for a turntable set that automatically drops the record stylus onto the record, there are multiple units integrally attached to the rotation axis of the tone arm on the outer periphery. A rotating body is provided at the tip of the size adjusting lever that rotates when the tone arm is rotated, and a rotating body is provided at an eccentric position of the rotating body. An eccentric pin is installed that locks on one of the locking edges of the size determining lever to restrict the rotation of the tone arm and determine the falling position of the record needle, and connects the rotating body to the top or front of the set base. By connecting the adjustment knob provided on the part with a flexible spring coil, and rotating the rotating body by rotating the knob,
The falling position of the record stylus on the tone arm can be finely adjusted by adjusting the rotation of the rotating body using the adjustment knob, and the position of the record stylus on the tone arm can be finely adjusted. Errors in the falling position can be easily absorbed and adjusted, and since the adjustment knob and rotating body are connected by a flexible spring coil, the adjustment knob can be installed regardless of the position of the eccentric pin. Therefore, the adjustment knob can be placed in any location that is easy to operate.
Fine adjustment operations can be easily performed, and the falling position of the record stylus onto the record can be easily adjusted.

[Brief explanation of the drawing]

The drawings show one embodiment of the record stylus adjustment device of this invention, with FIG. 1 being an overall perspective view, FIGS. 2 and 3 being bottom and front views showing the mechanism for selecting the record size, and FIG. The figure is a side view showing the CUE mechanism, and FIGS. 5 and 6 are side views showing the adjustment mechanism. 1...Set base, 3...Tone arm, 8...
...Adjustment knob, 19...Size determination lever, 20
...shaft, 7″, 10″, 12″…locking edge,
22...Size adjustment lever, 27...Eccentric pin,
31...Flexible spring coil, 32...
…Rotating body.

Claims (1)

[Scope of utility model registration request] In a record stylus adjustment device for a turntable set that automatically drops the record stylus onto the record, a size determining lever is integrated with the rotation axis of the tone arm and has a locking edge corresponding to a plurality of record sizes on the outer periphery. A rotating body is provided at the tip of a size adjusting lever that supports the tone arm and rotates when the tone arm rotates, and the rotary body is engaged with one of the locking edges of the size determining lever at an eccentric position. An eccentric pin is installed to regulate the rotation of the tone arm and determine the falling position of the record stylus,
A record stylus adjustment device, wherein the rotary body and an adjustment knob provided on the top or front of a set base are connected by a flexible spring coil, and the rotary body is rotated by rotation of the knob.