JPS6030803Y2 - pickup arm device - Google Patents

Description

[Detailed Description of the Invention] The present invention has a tone arm body provided with a cartridge at one end and a stylus pressure applying weight at the other end, and a gap between the cartridge and the weight of the tone arm body. The purpose of the pickup arm device is that the mounting part is attached to a rotation bearing and is supported rotatably in the vertical direction (rotating around a horizontal axis) and in the left-right direction (rotating around a vertical axis). The object of the present invention is to facilitate adjustment of a needle pressure applying weight provided at the rear end of the tone arm main body.

In general, a pickup arm device has an insertion hole 4 for a needle pressure applying weight 3 having a lock screw 2 inserted into the rear end of the tone arm body 1, as shown in FIG. The protrusion 1a is engaged with a spiral groove 4a provided in the inner wall of the insertion hole 4 of the needle pressure weight 3, and the needle is connected to a cartridge (not shown) provided at the front end of the tone arm body 1. To adjust the pressure, loosen the lock screw 2 and rotate the needle pressure applying weight 3 in the direction of arrow A shown in the figure using the protrusion 1a0 as a guide. It was moved back and forth in the axial direction.

However, in the above case, the needle pressure applying weight 3
In order to rotate the tone arm body 1 with respect to the tone arm body 1,
The position of the lock screw 2 provided on it changes in the rotation direction,
When attempting to tighten the lock screw 2 after adjusting the stylus pressure, there is a problem in that it becomes difficult to tighten the lock screw 2 when the pickup arm device body is mounted on the record player.

In order to solve this problem, as shown in FIG. 2, the axis of the tone arm body 1 must be inserted into the inner wall of the insertion hole 4 of the needle pressure applying weight 3 into which the rear end of the tone arm body 1 is inserted. A recess i4b is provided corresponding to the direction, and this recessed groove 4b
The protrusion 1b provided at the rear end of the tone arm body 1 may be engaged with the stylus pressure applying weight 3 so that the position of the lock screw 2 of the stylus pressure applying weight 3 changes only in the axial direction. However, there is a problem in that the stylus pressure changes greatly even by slightly moving the stylus pressure application weight 3 in the direction of arrow B in the figure, making it difficult to adjust the stylus pressure.

The present invention eliminates these conventional drawbacks,
The present invention will be described below with reference to drawings of embodiments.

FIG. 3 shows an embodiment of the pickup arm device of the present invention, in which reference numeral 11 denotes a rotary bearing mounted on the cabinet of a record player, an arm base 12 attached to the cabinet, and an arm base 12 mounted on the cabinet. 12, a second bearing pedestal 15 rotatably supported in the left-right direction by bearing members 14 provided at both ends of the first bearing pedestal 13; 2 bearing stand 1
The rotary frame 17 is rotatably supported in the vertical direction by shaft supporting members 16 provided at both ends of the rotary frame 17.

The rotary mount 17 constituting the rotary bearing 11 has a connecting portion 17a for the tone arm main body 18 in front thereof, and the tip of the tone arm main body 18, one end of which is connected to the connecting portion 17a, is attached to a head shell for attaching a cartridge. 19 are provided.

A pickup cartridge 21 is fixed to this head shell 19 with screws 20.degree. 20.

Therefore, the tone arm main body 18 is supported to be rotatable in the vertical and horizontal directions relative to the rotary bearing 11.

On the other hand, the rotating frame 17 constituting the rotating bearing 11 is provided with a connecting portion 17a of the weight guide shaft 22 and a connecting portion 17C of the balance weight 23 at its rear, and one end is connected to the connecting portion 17b with a screw 26. A connecting portion 23a provided on the balance weight 23 is slidably connected to the weight guide shaft 22, and the balance weight 23 is connected to a connecting portion 17c of the rotating frame 17 via a stylus pressure adjustment knob 24. ing.

The balance weight 23 has a connecting portion 23a.
By tightening a lock screw 25 provided on the weight guide shaft 22 to the weight guide shaft 22, the rotary frame 17 is fixed at a proper position behind it.

Here, as shown in FIG. 4, the balance weight 23 is provided with a connecting portion 23a to the weight guide shaft 22 on the outer periphery of the balance weight 23 so as to be parallel to the axial direction of the balance weight 23. The weight guide shaft 22, whose one end is inserted into the insertion hole 17b' provided in the joint portion 17b of the rotary frame 17 and connected with a screw 26, is inserted into the insertion hole 23a' provided in the joint portion 23a. There is.

Further, the balance weight 23 has a protrusion 27 coaxially integrally formed at its front position, and the protrusion 27
A weight shaft 28 is integrally and coaxially formed in a front position of the weight shaft 28, and a left-hand threaded portion 29 having a larger diameter than the weight shaft 28 is provided at the tip of the weight shaft 28.

Further, as shown in FIG. 4, the stylus force adjustment knob 24 is formed into a cylindrical shape with a bottom so as to be fitted into a projection 27 provided on the balance weight 23, and a shaft portion provided on the bottom surface thereof. 30 is the weight shaft 28 of the balance weight 23
is inserted into a left-hand threaded hole 31 into which a left-hand threaded part 29 provided at the tip thereof is screwed.

Further, the stylus force adjustment knob 24 has a right-hand threaded portion 33 having a larger diameter than the shaft portion 30 at the tip of its shaft portion 30, and the right-hand threaded portion 33 is connected to the connecting portion 17c of the rotating frame 17. It is inserted into the provided right-hand screw hole 32 and screwed together.

In addition, in FIG. 4, numeral 34 is a pull-out stop shaft provided at the other end of the weight guide shaft 22.
The balance weight 23, which slides in the front-rear direction while being guided by the balance weight 23, is prevented from coming off.

In a pickup arm device with such a configuration,
Right-hand screw hole 3 provided in the joint 17c of the rotating frame 17
When the stylus pressure adjustment knob 24 screwed into the stylus pressure adjustment knob 2 is rotated, the stylus pressure adjustment knob 24 moves forward and backward while rotating. The threaded balance weight 23 is guided by a weight guide shaft 22 provided at the connecting portion 17b of the rotating frame 17 and is moved in the front-back direction.

At this time, the balance weight 23 receives the rotational force of the stylus pressure adjustment knob 24, but the weight guide shaft 23
2, the lock screw 25 only moves in the front-back direction, and the tightening position of the lock screw 25 changes in the axial direction of the balance weight 23, but does not change in the circumferential direction; The attachment makes it easier to operate.

Moreover, since the balance weight 23 is screwed to the stylus force adjustment knob 24, fine stylus force adjustment can be performed.

In the above embodiment, the stylus pressure adjustment knob 24 was connected to the rotating base 17 with a right-hand thread, and the balance weight 23 was connected to the stylus pressure adjustment knob 24 with a left-hand thread. In addition, the stylus force adjustment knob 24 is rotatably coupled to the rotating frame 7 without moving in the axial direction, and the balance weight 23 is screwed to the stylus pressure adjustment knob 24. Also, the stylus force adjustment knob 24 is connected to the rotary mount 17 through a threaded connection portion, and the balance weight 23 is rotatably connected to the stylus force adjustment knob 24 without moving in the axial direction. It's okay.

As described above, according to the present invention, the stylus force adjustment knob, which is rotatably connected to the rotary pedestal, is connected to the rear position of the rotary pedestal constituting the rotary bearing, to which the tone arm main body is connected at the front position. The balance weight is connected to the balance weight, and the balance weight is moved in the front and back direction along the weight guide shaft provided on the rotating frame.
The balance weight can adjust the stylus pressure by rotating the stylus pressure adjustment knob, and can also prevent the lock screw position from changing in the circumferential direction of the balance weight. Its practical value is extremely great, as it is easy to adjust and tightening the lock screw is easy to operate.

[Brief explanation of the drawing]

1 and 2 are exploded perspective views of the main parts of a conventional pickup arm device, FIG. 3 is a perspective view showing an embodiment of the pickup arm device of the present invention, and FIG. 4 is an enlarged view of the main parts of the same device. It is a diagram. 11...Rotating bearing, 17...Rotating frame, 18...Tone arm body, 22...
・Weight guide shaft, 23...Balance weight, 24...Stylus pressure adjustment knob, 25...
... Lock screw, 28 ... Weight shaft, 29,
33... Threaded part, 30... Shaft part, 31
．． 32...Screw hole part.

Claims (4)

[Scope of utility model registration request] (1) A tone arm main body is connected to the front position of a rotating mount that constitutes a rotation bearing, and a stylus force adjustment knob is connected to a rear position of the rotating mount so as to be rotatable with respect to the rotating mount, and the stylus force adjustment is adjusted. A weight guide shaft is connected in parallel to the needle pressure adjustment knob, and a balance weight, which is slidably attached to the weight guide shaft, is connected to the rear position of the rotating frame via the needle pressure adjustment knob, A pickup arm device characterized in that the balance weight is moved in the front-rear direction with respect to the rotary frame along the weight guide axis by rotating a pressure adjustment knob. (2) Utility model registration claim 1, characterized in that the balance weight is configured to be fixed at any rear position of the rotating frame by tightening a lock screw provided thereon to the weight guide shaft. Pick-up arm device as described. (3) The pickup arm device according to claim 1 or 2, wherein the stylus force adjustment knob is screwed to the rotating frame. (4) The pickup arm device according to claim 1, 2, or 3, wherein the balance weight is screwed to the stylus pressure adjustment knob.