JPS6237441B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tone arm drive device for a record player.

Generally, tone arm drive devices reduce the rotational speed of a motor using a gear train to raise and lower the tone arm, or use the rotational force of a turntable to raise and lower the tone arm. however,
A tone arm drive device having such a structure has a problem in that since a motor or a turntable is used as a drive source, the structure for the vertical and swivel motion is complicated, and its assembly is difficult.

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

FIG. 1 shows an embodiment of the tone arm driving device of the present invention. In the figure, 1 is a tone arm, a pick-up cartridge 2 is attached to its tip, and a balance weight 3 is attached to its rear end. ing. The tone arm 1 has a mounting portion 4 attached to a rotating frame at the rear of the central portion thereof, and the mounting portion 4 is rotatably supported on a horizontal shaft 6 with respect to the rotating frame 5. The rotating frame 5 has a vertical shaft 7 provided thereon and is rotatably supported by a bearing 9 provided on a panel 8. Therefore, the tone arm 1 is able to move up and down in the direction of the arrow shown in the figure about the horizontal axis 6, and can make a turning movement in the direction of the arrows E and I in the figure about the vertical axis 7. It is in. Reference numeral 10 denotes a lift arm for raising and lowering the tone arm 1, and a lifting device main body 11 is connected to this lift arm. Reference numeral 12 denotes a rotating plate for rotating the tone arm 1, which includes a rotating device main body 13 for lead-in operation and a rotating device main body 14 for return operation.
are connected. In other words, the rotation device main body 1
3 and 14 are connected to the rotating plate 12 by having push plates 16 and 17 facing the connecting rod 15 provided on the rotating plate 12, respectively. Further, the rotating plate 12 has a cutout 18 having a predetermined angle, and a stopper pin 1 is inserted into the cutout 18.
9 is positioned to regulate the amount of rotation of the rotating plate 12 by the rotating device bodies 13 and 14.

As shown in FIG. 2, the lifting device main body 11 includes a container 20 made of a non-magnetic material having concentric first and second ring recesses 20a and 20b, and a container 20 made of a non-magnetic material.
An electromagnet 23 with a coil 22 wound around a bobbin 21 disposed above in the first ring recess 20a of 0
a ring-shaped driven member 26 sealed in the second ring recess 20b of the container 20 and magnetically coupled to the electromagnet 23; and a movable member 26 that passes through the first ring recess 20a of the container 20. A ring-shaped driving member 28 is attached to the rod 27 and magnetically coupled to the driven member 26, and
It is fixed to the panel 8 by inserting the threaded shaft portion 20c provided at 0 into the panel 8 and tightening it with a nut 29. Here, the driven member 26 has a first member 26a that is magnetically coupled to the electromagnet 23 and a second member 26b that is magnetically coupled to the drive member 28. The members 26a and 26b are integrated by a ring-shaped connecting body 26c made of a non-magnetic material. The driven member 26 is sealed in the second ring recess 20b of the container 20 together with a viscoelastic fluid 24 such as silicone oil, and the second ring recess 20b is closed by a ring-shaped lid 25.
sealed inside. The movable rod 27 also has a through hole 21a in the bobbin 21 for the electromagnet 23 and a through hole 20d in the screw shaft portion 20c of the container 20.
It is supported on a shaft so that it can slide at
One end thereof is coupled to the lift arm 10. Therefore, when a one-pole voltage is applied to the electromagnet 23 in the lifting device main body 11, the first member 26a of the driven member 26 is attracted in the direction of the magnetic force generated by the electromagnet 23 and moves in the upward direction. , the second member 26b together with the first member 26a.
will also move in the same direction. And the second member 26b
The drive member 28 moves upward to move the movable rod 27 upward, and the tone arm 1 is moved in the direction of arrow C in the figure by the lift arm 10 connected to the movable rod 27. Rise.
On the other hand, in this state, when a voltage of the other polarity is applied to the electromagnet 23, the second member 26a of the driven member 26 is repelled by the magnetic force generated by the electromagnet 23 and moves in the downward direction. 1
The second member 26b also moves in the same direction as the member 26a. Then, following the movement of the second member 26b, the driving member 28 moves in the downward direction, the movable rod 27 descends, and the tone arm 1
is lowered in the direction of arrow D in the figure by the lift arm 10 connected to the movable rod 27. In such a process of raising and lowering the tone arm 1, the electromagnet 23 that drives the movable rod 27 is magnetically coupled to the driving member 28 provided on the movable rod 27 by the driven member 26 disposed in the viscoelastic fluid 24. Therefore, a braking force corresponding to the resistance force that the driven member 26 receives in the viscoelastic fluid 24 acts on the movable rod 27, and the tone arm 1 moves slowly from the initial stage of its vertical movement. This allows for stable vertical movement. Incidentally, in order to magnetically couple the electromagnet 23 and the driving member 28 with the driven member 26, it is desirable that at least one of the driving member 28 and the driven member 26 is made of a permanent magnet.

As shown in FIG. 3, the rotating device main body 13 includes a container 30 made of a non-magnetic material having concentric first and second ring recesses 30a and 30b, and a container 30 made of a non-magnetic material.
An electromagnet 33 with a coil 32 wound around a bobbin 31 disposed above in the first ring recess 30a of
a ring-shaped driven member 36 enclosed in the second ring recess 30b of the container 30 and magnetically coupled to the electromagnet 33; and a movable member 36 penetrating the first ring recess 30a of the container 30. A ring-shaped driving member 38 is attached to the rod 37 and magnetically coupled to the driven member 36, and
It is fixed to the chassis 39 by inserting the threaded shaft portion 30c provided at 0 into the chassis 39 in the panel 8 and tightening it with a nut 50.

Here, the driven member 36 has a first member 26a that is magnetically coupled to the electromagnet 33 and a second member 36b that is magnetically coupled to the drive member 38. members 36a, 36
b are integrated by a ring-shaped connecting body 36c made of a non-magnetic material. The driven member 36 is sealed in the second ring recess 30b of the container 30 together with a viscoelastic fluid 34 such as silicone oil, and the second ring recess 30b is closed by the ring-shaped lid 35.
is sealed within the ring recess 30b. Also,
The movable rod 37 is slidably supported by a through hole 31a of the bobbin 31 for the electromagnet 33 and a through hole 30d of the screw shaft portion 30c of the container 30, and one end thereof is attached to the push plate 16. is combined with Therefore, in the rotating device main body 13, when a voltage of one pole of the electromagnet 33 is applied, the first member 36a of the driven member 36 is attracted and moved in the direction of the magnetic force generated by the electromagnet 33, The second member 36 together with this first member 36a
b also moves in the same direction. Then, the driving member 38 is moved so as to follow the movement of the second member 36b.
moves, the movable rod 37 moves, the rotating plate 12 is pushed by the pushing plate 16 and rotates, and the tone arm 1 is rotated by a predetermined amount in the direction of arrow A in the figure. A voltage of the other pole is applied to the electromagnet 33 when the tone arm 1 turns by the amount used in the direction of arrow A in the figure. As a result, the driven member 3
The first member 36a of No. 6 is repelled by the magnetic force generated by the electromagnet 33 and moves in the opposite direction,
The second member 36b also moves in the same direction together with the first member 36a. Then, the driving member 38 moves in the opposite direction to follow the movement of the second member 36b and pulls back the movable rod 37. In such a turning process of the tone arm 1, the electromagnet 33 that drives the movable rod 37 is magnetically coupled to the driving member 38 provided on the movable rod 37 by the driven member 36 disposed in the viscoelastic fluid 34. Due to this relationship, a braking force corresponding to the resistance force that the driven member 36 receives in the viscoelastic fluid acts on the movable rod 37, and the tone arm 1 slowly shifts from the initial stage of the turning movement. This allows a turning movement for a stable lead-in operation to be performed. In order to magnetically couple the electromagnet 33 and the driving member 38 with the driven member 36, it is desirable that at least one of the driving member 38 and the driven member 36 is made of a permanent magnet.

As shown in FIG. 3, the rotating device main body 14 includes a container 40 made of a non-magnetic material having concentric first and second ring recesses 40a and 40b, and a container 40 made of a non-magnetic material.
An electromagnet 43 with a coil 42 wound around a bobbin 41 disposed above in the first ring recess 40a of
, a ring-shaped driven member 46 enclosed in the second ring recess 40b of the container 40 and magnetically coupled to the electromagnet 43, and a movable member 46 penetrating the first ring recess 40a of the container 40 A ring-shaped driving member 48 is attached to a rod 47 and magnetically coupled to the driven member 46, and the driving member 48
It is fixed to the chassis 49 by inserting the threaded shaft portion 40c provided at 0 into the chassis 49 in the panel 8 and tightening it with a nut 51. Here, the driven member 46 is connected to the electromagnet 43.
It has a first member 46a that is magnetically coupled to the drive member 48, and a second member 46b that is magnetically coupled to the drive member 48, and these first and second members 46a, 4
6b is a ring-shaped connecting body 46c made of a non-magnetic material.
integrated by. The driven member 46 is a viscoelastic fluid 44 such as silicone oil.
It is also enclosed in the second ring recess 40b of the container 40 and sealed with a ring-shaped lid 45. Further, the movable rod 47 is connected to the through hole 41a of the bobbin 41 for the electromagnet 43 and the container 4.
The screw shaft portion 40c is slidably supported in a through hole 40d of the screw shaft portion 40c, and one end of the screw shaft portion 40c is connected to the push plate 17. Therefore, when the rotation device main body 14 applies a polar voltage to the electromagnet 43, the first member 46a of the driven member 46
is attracted and moves in the direction of the magnetic force generated by the electromagnet 43, and the second member 46b moves in the same direction together with the first member 46a. Then, the driving member 48 moves to follow the movement of the second member 46b, and the movable rod 47 moves, and the rotating plate 12 is pushed by the pushing plate 17, and the tone arm 1 is moved as shown in the figure. Apply the specified amount in the direction of arrow B. A voltage of the other pole is applied to the electromagnet 43 when the tone arm turns by a predetermined amount in the direction of the arrow (R) shown in the figure. As a result, the driven member 46
The first member 46a is repelled by the magnetic force generated by the electromagnet 43 and moves in the opposite direction, and the second member 46b also moves in the same direction together with the first member 46a. Then, the driving member 48 moves to follow the movement of the second member 46b and pulls back the movable rod 47. During such a turning process of the tone arm 1, the electromagnet 43 that drives the movable rod 47 engages the driving member 48 provided on the movable rod 47.
The driven member 4 is disposed in the viscoelastic fluid 44 against the
6, the movable rod 47 has the driven member 46 connected to the viscoelastic fluid 4.
A braking force corresponding to the resistance force received in 4 acts,
The tone arm 1 starts to shift slowly from the beginning of the rotational movement, and can perform the rotational movement for a stable return operation. Incidentally, in order to magnetically couple the electromagnet 43 and the driving member 48 with the driven member 46, it is desirable that at least one of the driving member 48 and the driven member 46 is made of a permanent magnet.

In order to cause the tone arm 1 to perform the above-mentioned lifting/lowering and turning operations, for example, a first The power supply voltage may be supplied by switching a switch as shown in FIG. In other words, for the electromagnet 23 constituting the elevating device main body 11, the power source 55 is switched by the elevating switch 52 using the normally open switches 52-1a, 52-1b and the normally closed switches 52-2a, 52-2b. The electromagnet 33 constituting the rotating device main body 13 is supplied with power by the lead switch 53 with normally open switches 53-1a, 53-1b and normally closed switches 53-2a, 53-2b. 55 is switched and supplied, and the electromagnet 43 constituting the rotation device main body 14
For the normally open switch 54-1a, 54-1
b and normally closed switches 54-2a, 54-2b
The power source 55 may be switched and supplied using the return switch 54. With this configuration,
When the lifting switch 52 is operated, the tone arm 1 is lifted by a predetermined amount from the rest position (not shown) by the lifting device main body 11, and in response to the upward movement of the tone arm 1, the lead switch 53 is activated. When operated, the tone arm 1 is rotated by a predetermined amount by the rotation device main body 13. When the lifting switch 52 and the lead switch 53 are released in response to the turning movement of the tone arm 1, the lifting device main body 1
1 and the rotating device main body 13 move in the opposite direction, the tone arm 1 descends, and the pickup cartridge 2 at the tip thereof is connected to the rotating shaft 56 and the record disk 5 is placed on the turntable 57 which is rotated.
8 and completes the lead-in operation of entering the performance state.

On the other hand, when the lifting switch 52 is operated again at the end of the performance of the record disc 58, the tone arm 1 is lifted by a predetermined amount in the lifting device main body 11, and in response to the upward movement of the tone arm 1, the lifting switch 52 is operated again. The return switch 54 is operated, and the tone arm 1 is rotated by a predetermined amount by the rotation device main body 14. Then, in response to the rotational movement of the tone arm 1, the lifting switch 52 is activated.
When the return switch 54 is released, the elevating device main body 11 and the rotating device main body 14 move in the opposite direction, and the tone arm 1 descends to return to the rest position (not shown). Finish the operation.

In the above embodiment, the first member for coupling to the electromagnet and the second member for coupling to the drive member were used as the driven members constituting the lifting device main body 11 and the rotation devices 13 and 14, but these driven members Needless to say, 26 can be used in common as one as shown in FIG. Further, the driving member 28 includes a driven member 26
It may be biased by a spring 59 so as to maintain balance through magnetic coupling between the two.

Specifically, the attractive force between the driven member 26 and the driving member 28 is increased by constantly pushing the movable rod 27 and the driving member 28 downward by a certain amount using the spring 59. That is, in FIG. 6, the movable rod 27 follows the movement of the driven member 26 at the position where the S pole of the driving member 28 and the N pole of the driven member 26 are attracted, but the coupling force of the driving member 26 at that time is close to zero. Since the movement of the movable rod 27 following the driven member 26 is unstable, the movable rod 27 is driven with a predetermined amount of attraction force generated between the driven member 26 and the driving member 28 by a spring.

In addition, the above-mentioned lifting device main body 11, rotation device main body 1
3 and 14 may also be configured as shown in FIGS. 7, 8, and 9. That is, in the case of FIG. 7, an electromagnet 104 is constructed by winding a coil 103 around a bobbin 102 provided on the outer periphery of a bottomed cylindrical container 101 made of a non-magnetic material.
A driven member 105 magnetically coupled to the electromagnet 104 is enclosed in 1a together with a viscoelastic fluid 106 and sealed with a lid 108 having a screw shaft portion 107,
On the other hand, a guide shaft 10 provided at the other end of the container 101
The driven member 10 is attached to a cap-shaped movable member 110 that is supported so as to be able to slide along the
a ring-shaped driving member 11 magnetically coupled to 5;
1 is installed. Here, the driven member 105
has a first member 105a magnetically coupled to the electromagnet 104 and a second member 105b magnetically coupled to the drive member 111, and a non-magnetic They are connected at a body connection portion 105c. Additionally, a push plate connected to a lift arm and a rotating plate is coupled to the movable member 110. In the case of FIG. 8, a spring 112 is added to the structure of FIG.
05 is configured so that a braking force is further applied to the movement. In the case of FIG. 9, an electromagnet 124 is constructed by winding a coil 123 around a bobbin 122 provided in the axial direction of a bottomed cylindrical container 121 made of a non-magnetic material, and is placed inside a first recess 121a of the container 121. A driven member 125 that is magnetically coupled to the electromagnet 124 is sealed together with a viscoelastic fluid 126 in the lid body 1.
27, and on the other hand, a driving member 128 magnetically coupled to the driven member 125 is arranged in the second recess 121b of the container 121, and the driving member 1
A movable rod 131 supported by a bearing plate 130 that closes the second recess 121b of the container 121 is coupled to the movable rod 131.
A spring 132 is inserted through and biased to balance the magnetic coupling between the driven member 125 and the driven member 125. And this is the container 12 mentioned above.
It is attached by a screw shaft portion 129 provided integrally with 1.

As described above, according to the present invention, the tone arm lifting device main body and the tone arm rotating device main body are arranged in a viscoelastic fluid between the electromagnet that drives the movable member and the drive member provided on the movable member. The movable member is configured to transmit power by magnetic coupling of a driven member, and is configured such that when the electromagnet is driven, the electromagnet is driven via the driven member so that the motive power of the electromagnet can be taken out to the movable member. Since a source is used, a control force corresponding to the resistance force due to the viscoelastic fluid can be applied to the movable member in a non-contact manner, and it is possible to provide a drive device that is free from inconveniences such as oil leakage. In addition, power is transmitted to the movable member by applying the power of the electromagnet to a driving member provided on the movable member via a driven member in the viscoelastic fluid, so that when the electromagnet is driven, the initial state is The tone arm can be moved slowly up and down and rotated, and the tone arm can be driven stably.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a main part showing an embodiment of the tone arm drive device of the present invention, FIGS. 2 and 3 are enlarged sectional views of main parts of the same device, and FIG. 4 is an enlarged view of main parts of the same device. A plan view and FIG. 5 are electrical circuit diagrams of the main parts of the device, and FIGS. 6, 7, 8, and 9 show other embodiments of the tone arm drive device of the present invention, and a is a b is a perspective view of the appearance of the main part, and b is a cross-sectional view of the main part. 1...Tone arm, 10...Lift arm,
11...Elevating device main body, 12...Swivel plate, 13...
...Lead rotation device body, 14... Return rotation device body, 15... Connection rod, 16, 17... Push plate, 20, 30, 40, 101, 121... Sealed container, 23, 33, 43,104,124...
Electromagnet, 24, 34, 44, 106, 126...
Viscoelastic fluid, 26, 36, 46, 105, 125
...Followed member, 27, 37, 47, 131...Movable rod (movable member) 110...Movable member, 28,3
8, 48, 111, 128...driving member, 59,
112, 132...Spring.

Claims (1)

[Claims] 1. A driving member is fixed to a movable member connected to a lift arm for moving the tone arm up and down, and a driven member magnetically coupled to the driving member is placed in a sealed container together with a viscoelastic fluid. an electromagnet for driving the movable member is magnetically coupled to the driven member, and when the movable member is driven by the electromagnet, the electromagnet is activated via the driven member and the driving member. A driving member is fixed to a lifting device main body configured such that power can be taken out to the movable member, and a movable member connected to a rotating plate for rotating the tone arm, and is magnetically coupled to the driving member. A driven member is enclosed in a sealed container together with a viscoelastic fluid, an electromagnet for driving the movable member is magnetically coupled to the driven member, and the movable member is driven by the electromagnet. A tone arm drive device for a record player, comprising a rotating device main body configured such that the motive power of the electromagnet can be taken out to the movable member via a driven member and a driving member. 2. The main body of the rotating device is connected to a rotating plate for rotating the tone arm to bring the tone arm from the armrest position to the record playing position, and the main body of the rotating device for reeding the tone arm. Claim 1, characterized by comprising a return rotating device main body connected to a rotating plate for rotating the tone arm and bringing the tone arm from the record playing end position to the arm rest position. A tone arm drive device for a record player as described in Section 1. 3. The movable member constituting the rotating device main body and the lifting device main body is provided with an elastic member, and the driving member is biased in a direction opposite to the electromagnet. Tone arm drive device for record players. 4 The driven members constituting the rotating device main body and the lifting device main body are spring-biased by elastic members to balance the magnetic coupling between the driven members and the driving member magnetically coupled to the driven members. A tone arm drive device for a record player according to claim 1 or 2, characterized in that the tone arm drive device is configured as follows.