JPS6037683Y2 - pickup arm device - Google Patents

Description

[Detailed description of the invention] The present invention relates to an arm-replaceable pickup arm device in which a tone arm is detachably attached to a rotating bearing.The purpose of the invention is to separate the tone arm from the rotating bearing. Another object of the present invention is to provide a pickup arm device that does not have easy mounting operation and is structured so that the stress on the rotary bearing portion when replacing the arm can be reduced and damage to the rotary bearing portion can be prevented.

Generally, in a pickup arm device, as shown in FIG. 1, a pickup arm 2 is mounted and fixed on a rotating mount 1, and a cartridge mounting shell 4 is provided at the tip of the arm 2 to which a pickup cartridge 3 is mounted.
On the other hand, a weight support shaft 5 made of synthetic resin thread is provided on the opposite side of the rotating frame 1 from the arm 2, and a balance weight 6 is mounted on this support shaft 5 along the axial direction of the support shaft 5. It was installed so that it could be moved.

The rotating mount 1 is attached to a rotating shaft 7 by a pivot bearing 9 so as to be rotatable up and down, and this rotating shaft 7 is attached to a base 8 so as to be rotatable left and right. is also configured to rotate.

However, with this type of pickup arm device,
A coupling portion, that is, a lock nut 10 for detachably attaching the arm 2 to the rotating frame 1 is connected to the rotating frame 1.
Moreover, the arm 2, which is connected to the rotating frame 1 by the lock nut 10, is held at the stopped position by the arm rest 11 provided on the arm base 8, so that the Arm 2
It is difficult to replace the arm 2, and when the arm 2 is replaced, the performance of the rotary bearing 12 comprising the rotary frame 1 and the like deteriorates.

That is, when the arm 2 is separated from the rotating pedestal 1, the rotating pedestal 1 and the rotating shaft 7 are not held at all, and the rotating pedestal 1 and the rotating shaft 7 freely rotate around their respective shaft support members. As a result, the weight balance between the weight 6 side and the arm 2 side of the rotating pedestal 1 around the shaft support member 9 is greatly lost, and the weight 6 suddenly falls downward, causing the rotating pedestal 1 to collapse. A large impact may be applied to the bearings of the arm 2 and the rotating shaft 7, deteriorating the performance of the bearings, or the rotating pedestal 1 and the rotating shaft 7 may be in an unstable state. Not only is it difficult to replace the arm 2, but when the arm 2 is replaced, a large load is placed on the bearings of the rotary pedestal 1 and the rotary shaft 7, which deteriorates the performance of the bearings.

Moreover, the rotating frame 1 that constitutes such a rotating bearing 12
There was a major problem in that the performance deterioration of the bearing of the rotary shaft 7 deteriorated the sensitivity of the pickup arm device itself and significantly reduced the waist tracing ability.

The present invention provides a pickup arm device that eliminates the drawbacks of the conventional devices, and the present invention will be described below with reference to drawings of embodiments.

FIG. 2 shows an embodiment of the pickup arm device of the present invention, in which 21 is a rotary bearing, which is supported rotatably in the left and right direction (rotating around a vertical axis) with respect to an arm base 22. The rotating shaft 23 is provided with a rotary shaft 23, and a rotary mount 25 supported by a shaft support member 24 to be rotatable in the vertical direction (rotating around a horizontal axis) with respect to the rotary shaft 23.

The rotary mount 25 constituting the rotary bearing 21 has a connecting portion 26 to the tone arm protruding from one side thereof, and a rest arm 27 protruding below the connecting portion 26 .

The rotating frame 25 has a weight support shaft 28 protruding in a direction opposite to the connecting portion 26 and the rest arm 27.
A balance weight 29 is attached to the weight support shaft 28 so as to be movable along the axial direction of the weight support shaft 28 .

The arm base 22 constituting the rotation bearing 21 is provided with an arm rest 31 that engages and holds a rest shaft 30 protruding from the tip of the rest arm 27, and also includes a rotation trajectory of the rest arm 27. An arm lifter 33 operated by a cueing lever 32 is provided below.

34 is a tone arm, and a head shell 35 for attaching a cartridge is integrally formed at the tip of the tone arm.
7 is installed.

The other end of the tone arm 34 is electrically coupled to a coupling portion 26 provided on the rotating mount 25, and mechanically coupled by a lock nut 38 provided on the coupling portion 26.

As shown in FIG. 4A, the rest shaft 30 is disposed opposite to the lower surface of the tip of the rest arm 27, and has a mounting screw 41 inserted through an insertion hole 40 in a recess 39 provided on the upper surface of the tip of the rest arm 27. The head of the mounting screw 41 forms the same plane as the upper surface of the rest arm 27.

Further, as shown in FIG. 4B, the armrest 31 is formed in a substantially U-shape on a mounting shaft 31b, and a guide piece 31a for introducing the rest shaft 30 is provided at the tip of the rest arm 27 at the opening thereof. The mounting shaft 3 is inserted into a recess 42 provided on the upper surface of the arm base 22.
It is fixed to 1b by tightening a mounting screw 43 inserted from the underside of the arm base 22.

In such a pickup arm device, when the arm 34 is separated from the rotating pedestal 25 constituting the rotating bearing 21, the rest shaft 30 at the tip of the rest arm 27, which is integrally provided with the rotating pedestal 25, rotates. It is engaged with an armrest 31 of an arm base 22 provided with a bearing 21, and the rotating pedestal 25 is held at the armrest position.

Therefore, when the arm 34 is separated, the rotation bearing 2
There is no possibility that the rotating mount 25 and rotating shaft 23, which constitute the main unit 1, will rotate freely.

Furthermore, when replacing the arm 34, no excessive force is applied to the rotating pedestal 25 and the bearing portion of the rotating shaft 23 that constitute the rotating bearing 21.

Therefore, there is no possibility that the performance of the bearing section that constitutes the rotary bearing 21 deteriorates when the arm 34 is replaced, thereby degrading the tracing ability of the pickup arm device itself.

Moreover, the rotary pedestal 25 constituting the rotary bearing 21 has a rest arm 27 provided thereon, so that the arm rest 31
Since the arm 34 is firmly held, it becomes extremely easy to replace the arm 34.

In the above embodiment, the exchange arm 3 has a head shell 35 for mounting the pickup cartridge 37 at its tip.
4, and the exchange arm 34 is detachably attached to the coupling part 26 provided on the rotating frame 25 using the lock nut 38 provided therein. As shown, a head shell 35 for mounting a pickup cartridge 37 is formed at the tip,
A mounting portion 44 to the rotating frame 25 which has a stylus pressure adding weight or an adjustable stylus pressure adding weight 29 at the other end and constitutes a rotating bearing 21 between the herad shell 35 and the weight 29. Interchangeable arm 34 that integrates
The present invention can be similarly applied to the case of using .

In this case, the exchange arm 34 has a mounting portion 4 provided thereon.
4. A mounting screw 46 is screwed into the center screw hole 45, and this mounting screw 45 is inserted into the screw hole 4 provided in the rotating frame 25.
6, it can be detachably attached to the rotating frame 25.

In this case, the rotation bearing 21 is connected to the arm base 22.
A U-shaped first bearing pedestal 47 is provided, and a U-shaped rotating member 23 is rotatably supported in the left and right direction with shaft supporting members 48 at both ends of the first bearing pedestal 47. Part 2
A U-shaped rotating frame 2 with shaft support members 24 at both ends of 3.
5 is supported rotatably in the vertical direction, and the cartridge 37 is connected to the outside of the rotation bearing 21 by a relay connector 49 provided on the rotation mount 25 and a relay connector provided on the mounting portion 44. 50 may be used.

Further, as described above, the cartridge mounting head shell 35 is provided at one end, the weight 29 is provided at the other end, and the rotation bearing 21 is provided between the head shell 35 and the weight 29.
When using the exchange arm 34 which has an integrally formed attachment part 44 to the rotating frame 25 that constitutes the 4
4 to the rotating frame 25, and the mounting portion 4
By tightening the lock screw 51 provided at 4, it can be detachably attached to the rotating pedestal 25.

In this case, the cartridge 3 provided on the exchange arm 34
7 to the outside of the rotating bearing 21 is connected to a plug (not shown) provided in a substantially U-shaped recess 52 of the mounting portion 44 and the rotating frame 25 to which the mounting portion 44 is slidably engaged. This may be done using a socket 53 provided in the.

Further, as shown in FIG. 7, a locking knob 54 having a locking claw 54a is rotatably attached to the armrest 31, and when the rest shaft 30 at the tip of the rest arm 27 is engaged with the armrest 31, the Lock knob 5
4 may be rotated to lock the rest shaft 30 engaged in the armrest 31 with its locking pawl 54a.

As described above, according to the present invention, an arm having a head shell for attaching a cartridge at its tip is configured to be removably attached to a rotating pedestal forming a rotary bearing, and the waist of the rotating pedestal is attached to the attached side. Since a part of the opposite side is configured to engage with an armrest provided on the arm base, the rotating pedestal is firmly held on the armrest when the arm is separated from the rotating pedestal that constitutes the rotating bearing, and when it is attached or detached. You can keep it.

Therefore, not only does the work of replacing the arm become much easier, but the performance of the bearing section is not deteriorated due to excessive force being applied to the rotary bearing, and the tracing ability of the device itself is effectively maintained. such as being able to
Its practical effects are extremely large.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional pickup arm device, Figure 2 is a perspective view of a conventional pickup arm device;
The figure is a perspective view showing one embodiment of the pickup arm device of the present invention, FIG. 3 is an enlarged perspective view of the main part of the device, and FIG. 4A,
B is an enlarged perspective view of the main parts of the device, Figures 5 and 6.
This figure is a perspective view showing another embodiment of the pickup arm device of the present invention, and FIG. 7 is a perspective view of essential parts showing another embodiment of the pickup arm device of the present invention. 21...Rotating bearing, 22...Arm base, 25...Rotating frame, 26...Joining portion, 27...Rest arm , 29...
Weight, 30...Medium strike axis, 31...
Armrest, 33...Arm lifter, 44
...Mounting part, 46...Mounting screw, 4
9.50...Relay connector, 51...Tatsuknut, 53...Socket.

Claims (3)

[Scope of utility model registration request] (1) A tone arm having a head shell for attaching a cartridge at its tip is configured to be removably attached to a rotating pedestal constituting a rotating bearing, and a part of the rotating pedestal on the side opposite to the side on which the weight is attached. A pickup arm device characterized in that the pickup arm device is configured to engage with an armrest provided on an arm base. (2) The pickup arm device according to claim 1, which is a utility model registration, characterized in that an arm lifter is provided on the arm base corresponding to the rotation locus of the portion of the rotating mount that is engaged with the arm rest. (3) The pickup arm device according to claim 1 or 2, wherein the armrest is provided with a locking member for maintaining the locked state of the rotating mount.