JPS5827897B2 - Record player arm lifting/rotating mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an arm elevating and rotating mechanism for a record player.

The conventional arm lifting/rotating mechanism selects the lowering position of the cartridge onto the record surface by giving an appropriate rotation position to the select lever and using this as a lever to regulate the rotation angle of the arm. However, this method requires a separate electro-mechanical conversion to determine the rotational position of the select lever, and the mechanism is extremely complex, with a lot of play in the mechanical parts. It becomes.

Another method uses separate motors to raise and lower the arm and rotate the arm, but this method requires two motors and is expensive.

Therefore, recently, an arm lifting/lowering/rotating mechanism having a structure as shown in FIG. 1 has been proposed.

This is done by reciprocating the cam 2 having the cam surface 2a to the left and right in the figure using the rack 1, for example, and moving the driven pin 5 at the tip of the lever 4 that rotates the arm shaft 3 to the driven pin 5 at the end of the lever 4 that rotates the arm shaft 3. Push with drive plates 6 and 7, and arm shaft 3
While rotating the cam surface 2a, a valley portion 2a1 is formed approximately at the center of the cam surface 2a.
is formed to raise and lower the elevating shaft 8a of the elevating seat 8 of the arm on which the cam surface 2a slides. According to this structure, the arm can be moved up and down and rotated only by moving the cam 2, and Although the configuration is extremely simple, since it is performed by the action of only the cam 2, the time required for the arm to move up and down is approximately the same as the time for the rotation.
In particular, it has the drawback that it takes a long time to lower the arm, and a safety mechanism is also required when the arm is stopped manually to operate the mechanism.

The present invention focuses on the above-mentioned points, and is based on the idea of the mechanism shown in Fig. 1.The present invention eliminates the shortcomings of the mechanism, namely, the waiting time from raising and lowering the arm to rotating it, and also eliminates the waiting time for the arm to be stopped by hand. It also has a safety mechanism in case of
It is an object of the present invention to provide an arm lifting/lowering/rotating mechanism that is simple and allows a series of lifting/lowering/rotating operations of the arm to be performed by controlling only one motor.

Hereinafter, one embodiment will be described with reference to FIG. 2 and subsequent figures.

A is an arm that rotates around the arm shaft 3, B is a panel of the record player, and C is a bearing for a lifting shaft 8a having the arm shaft 3 and a lifting plate 8.

The main shaft 9, which is fixed at a position slightly shifted from the lifting shaft 8a, has a
A sleeve 9a is rotatably fitted coaxially.

This sleeve 9a has a flange 93' attached to one end and a screw 9a'' attached to the outer periphery of the other end.
A cam 10 and a rotary drive gear 11 are coaxially supported via a friction plate 12 at an intermediate portion between the two.

The cam surface 10a has a trough portion 10a1 extending approximately 180 degrees with the lowest portion on a concentric circle with respect to the main shaft 9 of the cam 10.
is formed.

Then, the nut 9b screwed onto the screw 9a" and the drive gear 1
A compression spring 20 is compressed between the cam 10 and the cam 10.
and the drive gear 11 are elastically held between the collar 93' of the sleeve 9a and the compression spring 20 via the friction plate 12,
These are integrated into a unit.

In this unit, movement of the main shaft 9 in the axial direction is restricted by a stopper 9c such as an E IJ song attached to one end of the main shaft 9.

Also, the shaft 1 at an eccentric position away from the main shaft 9 of this cam 10
A planetary gear 13 is pivotally supported on 0b.

A roller 13a made of rubber or the like is fitted onto the upper part of the shaft 10b on which the planetary gear 13 is fitted.

The drive gear 11 has a tooth portion 1 that meshes with the planetary gear 13.
In addition to 1a, a worm tooth portion 11b is formed, and this worm tooth portion 11b controls the rotation of the motor 14.
, 16, the worm 1T is engaged with the worm 1T.

18 is a semicircular driven plate fixed to the arm shaft 3;
It is located on the same plane as the roller 13a that is integral with the planetary gear 13, and its outer edge is arranged to come into contact with the roller 13a that has revolved due to the rotation of the cam 10.

That is, the driven plate 18 is arranged within the revolution locus of the roller 13a.

The driven plate 18 also has holes 19a to 19c1 for stopping the arm in the outer circumferential groove of the record, depending on the size of the record, and a hole 19d for detecting the position where the arm has returned to the armrest. Hole 19 for detecting termination
eQi is provided, and the rotation of the motor 14 is controlled by detecting it using a known optical light emitting/light receiving element.

Note that as this method, means such as magnetic detection and electrostatic detection can also be used.

The operation of the above mechanism will be explained with reference to FIG.
10 is rotated integrally with its drive gear by a friction plate 12 pressed by a compression spring 20, and as a result, the planetary gear 13 and roller 13a revolve at the same speed as the drive gear 11 (FIG. 4A).

That is, the friction force between the drive gear 11 and the cam 10 is greater than the friction force between the cam 10 and the lifting shaft 8a.
In this way, the cam 10 rotates as the drive gear 11 rotates, and the planetary gear 13 revolves.

At this time, the sleeve 9a also rotates, but since the compression spring 20 does not act as a load on the rotation of the sleeve 9a, the load on the motor 14 is only for moving the arm lift shaft 8a up and down.

By the way, by controlling the motor 14, the cam 10 is
If the valley portion 10a1 of the cam surface 10a is set to be located directly below the elevating shaft 8a, this position becomes the arm lowering position or the return position where the arm has returned to the arm rest.

Note that at this time, the driven plate 18 is located on the substantially opposite side of the main shaft 9 to the planetary gear 13, so that the arm can rotate completely freely.

Then, when the cam 10 rotates as shown in FIG. 5A above,
The elevating shaft 8a had descended into the trough 10a1 of the cam surface 10a.
rises from the trough 10a1, thereby causing the arm A to rise at the armrest]2.

At this time, the frictional force of the friction plate 12 is applied to the lifting shaft 8a and the cam surface 1.
The resistance force of 0a is canceled, so arm A can be raised without any problem.

The cam 10 continues to rotate after that, and when the roller 13a comes into contact with the driven plate 18 as shown in FIG.
The revolution of 3 stops, and the cam 10 also stops its rotation,
Since the drive gear 11 continues to be rotated by the motor 14, the planetary gear 13 cannot revolve due to the rotation of the tooth portion 11a, but this time it overcomes the frictional force of the friction plate 12 and starts rotating.

Therefore, the rotation of the planetary gear 13 moves the outer edge of the driven plate 18 via the roller 13a, that is, the driven plate 18 starts rotating.

Therefore, the arm shaft 3 rotates, and the arm A rotates in the direction of the record disc.

At this time, since the roller 13a is rotated by being pressed by the first driven plate 18, the rotation of the arm A becomes stable and smooth.

Then, at the point when arm A has rotated at an appropriate angle, that is,
Depending on the size of the record, the hole 19a of the driven plate 18 is
If the motor 14 is reversed when any of the conditions 19c to 19c is detected, the drive gear 11 will be reversed, so the planetary gear 13 and the cam 10 will rotate in the opposite direction (4th
Figure C).

At this time, the planetary gear 13 stops rotating due to the separation of the roller 13a from the driven plate 18, and only revolves due to the frictional force of the friction plate 12.

As described above, the cam 10 is immediately reversed by the reverse rotation, and since the cam 10 has already stopped when the driven plate 18 starts rotating, the trough 10a1 of the cam surface 10a is only a short distance away from the lifting shaft 8a. Since the motor 14 is not rotated slightly, the trough 10a of the cam surface 10a is
, returns to the position directly below the lifting shaft 8a, and as a result, the lifting shaft 8a descends, and the car 1-
IJ Tsuji begins to descend to the surface of the record.

The motor 14 then stops at the position shown in FIG.

That is, the lead-in operation is performed as described above.

In the above, when the motor 14 is rotated forward for a time T1 until the planetary gear 13 comes into contact with the driven plate 18, the arm A
is raised and then rotated forward for a time T2, arm A rotates at an appropriate angle, and then reversed for a time T1, causing arm A to descend to the surface of the record.

That is, the lifting and lowering time T1 of the arm A is always constant regardless of the size of the record and regardless of the rotation time T2.

Therefore, it is possible to set T1 (T2).

When the arm A is returned from the performance position to the original position (on the armrest) (recoup operation), the end of the performance is detected by the hole 19e of the driven plate 18, and the motor 14 is activated. By rotating the drive gear 11 counterclockwise, the planetary gear 13 is rotated counterclockwise, and the arm A is first raised by the cam surface 10a.
Then, from the time when the roller portion 13a of the planetary gear 13 comes into contact with the driven plate, it is moved in the opposite direction to the moving direction of the arm A.

Then, the position where the hole 19d of the driven plate 18 is detected, that is, the position where the arm A has moved on the armrest, is detected, the motor 14 is reversed, and the planetary gear 13 is separated from the driven plate 18 by clockwise rotation. Along with this, the cam surface 10a
to lower arm A onto the armrest.

In the above embodiment, the cam 10 includes a rotating member on which the planetary gear 13 meshed with the 1st drive gear 11 is rotatably supported, and an arm elevating shaft that is linked to the rotation of this rotating member. Although it is configured as an integral part with a lifting member that moves the 8a up and down, the rotating member and the lifting member may be separate pieces.

Further, the friction plate 12 may be a spring that has a similar effect.

From the above, according to the present invention, it is possible to automatically and continuously control the elevation and rotation of the arm by only controlling the forward rotation, reverse rotation, and stop of one motor, and the waiting time from elevation to rotation is reduced. There is almost no problem, and the operation is stable and smooth.
Furthermore, the mechanism becomes simpler.

In particular, when the arm rotates, the force of the compression spring does not become a load on the motor, which is advantageous in reducing the size of the motor, as well as being able to adjust the compression force of the compression spring. The frictional force caused by the friction plate can be set to an optimum value.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the mechanism underlying the present invention, Fig. 2 is a plan view of an embodiment of the invention, Fig. 3 is a sectional view, Fig. 4 is an enlarged sectional view of the main parts, and Fig. 5. is an operation explanatory diagram. 3...Arm shaft, 8...Elevating seat,
8a... Lifting axis, 9... Main r-=, 9
a... Sleeve, 10... Cam, 10
a...Cam surface, 10a1...Trough, 1
DESCRIPTION OF SYMBOLS 1...Rotation drive gear, 12...Friction plate, 13...Planetary gear, 13a...Roller, 14...Motor, 15 .16...
Pulley, 17... Worm, 18...
Driven plate 1, 20...compression spring.

Claims (1)

[Claims] 1. In a record player in which an arm is raised, lowered, and rotated by a motor capable of forward and reverse rotation, a rotary 1 drive gear rotatably driven by the motor, and a rotary drive gear pivotally supported on a common rotation shaft with the rotary drive gear. a rotating member, a planetary gear rotatably supported on the rotating member and meshed with the rotation 1 drive gear, a roller that rotates in conjunction with the planetary gear, and a rotational trajectory of the roller. a driving plate disposed on and fixed to the arm shaft; an arm lifting shaft supported so as to drive the arm in the vertical direction; an elevating member that moves the shaft up and down; the rotary shaft is comprised of a sleeve coaxially supported by the main shaft; The rotary drive gear and the rotary member are elastically sandwiched between the rotary member and the rotary member through a friction plate, and the rotation of the motor rotates the rotary drive gear, and the roller is rotated by the driven member. The rotation and the rotation of the drive gear are transmitted to the rotary member via the friction plate while the rotary member is not in pressure contact with the plate, and the rotation of the rotary member moves the elevating member to move the arm elevating shaft. An arm lifting/lowering and rotating mechanism characterized in that the arm is moved up and down through the arm.