JPS6325433B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small so-called bookshelf type record player, and its feature is that a turntable is mounted on a chassis supported by a player cabinet via a vibration isolator. By fixing the guide member that slidably supports the installed slide base and the pick-up holding device, the relative positions of the pick-up and the turntable can be accurately determined.

Conventionally, record players commonly used have a turntable placed in the center that is slightly larger than the largest diameter record, so the player cabinet has been quite large.

Therefore, in this invention, a turntable smaller than the turntable used in the conventional device is supported so as to be movable in the front and rear directions relative to the player cabinet, thereby reducing the size of the player cabinet. .

However, if only the tone arm rotation bearing is attached to the player cabinet via a vibration isolating member, and the guide member that movably supports the turntable is attached directly to the player cabinet, the tone arm and turntable will be separated. The disadvantage is that the relative position of the two cannot be accurately determined.

An object of the present invention is to accurately position the tone arm and the turntable relative to each other even though the turntable is supported so as to be movable in the front and rear directions with respect to the player cabinet.

Embodiments of the invention will be described with reference to the drawings.

FIG. 1 shows a bookshelf-type record player 1 of the present invention stacked with a tuner and integrated amplifier of uniform size and stored in a bookcase.

The width, depth, and height of the player cabinet are 320 mm, 200 mm, and 98 mm, respectively, and are large enough to be stored side by side with an A4 book (30 cm x 21 cm).

FIG. 2 shows its appearance, with the front cover opened and the slide base 9 equipped with the phono motor 7 moved from the storage position to the front record exchange position.

A turntable 44 having a diameter slightly smaller than the depth of the player cabinet is provided on the slide base, and this is sufficient for practical use, but if you wish to obtain even higher performance, a turntable 44 may be used. The large sub-turntables 45 can be stacked on top of each other.

Referring to FIG. 3, an outline of the related operations between the slide base and the tone arm will be explained.

To move the slide base and tone arm,
All operations can be performed simply by pressing the start/stop switch S6, and the slide base can be moved from the storage position (a) to the record changing position (b) to the playing position (c).
Move as follows: record exchange position (b) → ((c) → (b) →...) → storage position (a).

In the storage position (A), the slide base 9 is inside the player cabinet, the turntable shaft is located at A in the figure, and the tone arm 5 is rotated to the back of the turntable 44.

Open the front cover and press the start/stop switch S6
When is pressed, the slide base 9 moves forward and stops at the record exchange position (b). At this time, the turntable shaft is located at B in the figure.

At this position, if necessary, attach the sub-turntable 45, place the record R on it, and press the start/stop switch S6. The slide base 9 moves in the opposite direction to the playing position (C).
Then, the tone arm 5 rotates toward you and descends to the introduction groove of the record, and the performance begins. At this time, the turntable shaft is located at C in the figure.

When the performance ends and the tone arm 5 reaches the lead-out groove, the tone arm rises and rotates to the back of the turntable 44 again, and the slide base 9 moves forward and stops at the record exchange position (b). do.

When the record is replaced and the start/stop switch S6 is pressed, the operation of moving to the playing position (c), finishing the performance, moving to the record changing position (b), and stopping is repeated, as before.

To move the slide base 9 to the storage position (A), remove the record R (if the sub turntable 45 is used, also remove it), press the start/stop switch S6, and the slide base 9 will be moved to the rear. without stopping at the playing position (c), it moves to the storage position (a) and stops.

The internal mechanism will be explained in detail.

FIG. 4 is a plan view of the player cabinet 1 with the top plate and arm base 6 removed, and FIG. 5 is a front view thereof.

Inside the player cabinet 1, operating switches S6 to S9 and circuit sections 2a and 2b are provided at the top, and at the bottom, via a vibration isolating device 3,
Chassis 4 is supported.

The chassis 4 is provided with an arm base 6 that supports the tone arm 5, an automatic mechanism portion that rotationally drives the tone arm 5, and a phono motor 7.
A slide base 9 to which a turntable bearing 8 is fixed is supported so as to be slidable in the front-rear direction.

The slide base 9 is supported by two pairs of guide rollers 10, 10', 11, 1 provided on the chassis 4.
1' and a pair of guide rollers 12, 12' provided on the slide base 9 in the vertical direction, and a shaped portion 9a provided on the slide base 9.
and guide rollers 13, 1 provided on the chassis 4.
4, the left and right directions are respectively regulated.

The rack drive gear 15 meshes with a rack 16 slidably supported by the chassis 4, and is connected to one end of a crank 43 with a crank pin 43a, and is driven by a motor 22 via a worm wheel 17, a worm 18, and a belt 19. be rotated.

The number of teeth of the rack drive gear 15 and the rack 16 is
When the drive plate 28 (described later) completes the lead-in operation of the tone arm 5, the slide base 9
is configured so that it reaches the storage position.

A pickup plate 23 that rotates integrally with the tone arm 5 is fixed to the tone arm 5, and the pickup plate 23 is provided with an end portion 23a for appropriately preventing its rotation and a pin 24 that engages with a drive plate 28. There is.

The tone arm 5 is provided with an opening communicating with the arm pipe at a position above its horizontal rotation axis,
The output lead wire of the pickup cartridge is drawn out from here and connected to the output terminal of the record player.

An elevation seat 25 for moving the tone arm 5 up and down is supported on the arm base 6 so as to be movable up and down by an elevation shaft 26. 28a.

Further, the arm base 6 is provided with a well-known mechanism consisting of a lamp and a photoelectric conversion element for detecting the end of playing a record.

The drive plate 28 pivotally supports a lead-in latch 29 and a rotatable resetter 30 which are toggled by a leaf spring 27, and is slidably supported by the chassis 4 and is rotated by a spring as shown in FIG. It is biased upward.

The crank 43 has its elongated hole 43b engaged with a pin 31 fixed to the chassis 4, and the drive pin is inserted through the window 28b of the drive plate 28.

The index cam 33 has a step cam section corresponding to the lead-in position of the arm, and a roller 34 that can come into contact with the outer periphery of a 30 cm record is pivotally supported on the top of the index cam 33.
As shown in the figure, in the stored state and playing state,
The protrusion 33a of the index cam 33 engages with the protrusion 28c of the drive plate 28 and is rotated by a predetermined angle.

The pick-up stopper 35 includes a cam portion 35a that is biased counterclockwise by a spring (not shown) and comes into contact with the right end of the slide base 9, and when the slide base 9 is between the playing position and the storage position. When the pick-up stopper 35 is rotated clockwise by the slide base 9, the end of the pick-up stopper 35 engages with the end 23a of the pick-up plate, thereby preventing the pick-up plate 23 from rotating.

The record detection lever 3 is attached to the slide base 9.
6 and a reset lever 37 are pivotally supported, a reversing spring 38 is hung between them, and the opening angle is regulated by contact between protrusions 36c and 37b provided on both.

The reset lever 37 operates on the rising portion 4 of the chassis 4 when the slide base 9 reaches the attachment/detachment position.
a, and a spring 39
is biased counterclockwise.

The record detection lever 36 includes a chevron portion 36a that comes into contact with the record detection pin provided on the turntable when it descends due to the weight of the record, a locking portion 36b that prevents the movement of the lock lever 41, and a record detection pin 40 that rotates. When the guide cam 42 is fixed to the float base 4
An end portion 36d is provided which engages with and stops the movement of the slide base 9.

The slide base 9 further includes a lock bar 4.
A rack 16 is slidably mounted which is provided with a cam portion 16a that engages with the rack 16.

In addition, the slide base 9 has a lock bar 41.
is slidably and rotatably supported, and a spring 46 is stretched between the slide base 9 and the lock bar 41.

The lock bar 41 includes a protrusion 41a that can engage with a locking portion of a record detection lever and a guide cam 42.
and a pin 41 that engages with the cam portion 16a of the rack 16.
It is equipped with b.

The circuit section 2a includes a start/stop switch S6 that controls slide base in/out and tone arm lead in/return, a switch S7 that specifies repeat performance, and a switch S7 that controls the rotation speed of the phono motor, which are connected to the operation buttons. A control switch S8 and a key switch S9 for independently raising and lowering the tone arm elevation mechanism are connected.

As shown in FIG. 6A, the chassis 4 includes:
Limit switches S1 to S4 are provided to detect the positions of the slide base and drive plate.

Further, as shown in FIG. 7, a safety switch S5 is provided behind the turntable position in the stored state and the sub-turntable position in the playing state and within the movement trajectory of the sub-turntable. .

Next, its operation will be explained.

() Storing position (A)→Record replacing position (B) When the slide base 9 is in the storage position as shown in Fig. 4, press the start/stop switch S6, the motor 22 starts, and the Rotate the drive gear 15 counterclockwise.

The crank 43, as shown in FIG.
The elongated hole portion 43b is guided by a pin 31 fixed to the chassis 4, and the drive pin 32 at the tip draws a waterdrop-shaped trajectory, and the drive plate 28
Move it upwards in the diagram and place it in that position. That is, as shown in Figure A, the drive plate 28 is moved upward during the half-stroke to the top dead center, and the lead-in latch 29 is reversed and engaged with the engagement pin 24 of the pick-up plate 23. However, as shown in Figures B and C,
During the remaining half stroke, the drive pin 32 passes through the window 28b of the drive plate 28 and does not move the drive plate 28.

In this way, the drive plate 28 holds the tone arm 5 in the storage position without rotating it.

At the final stage of the above process, the drive pin 32
It contacts the resetter 30 and rotates it counterclockwise, as shown in FIG. 9, so that the index cam 33, regardless of its previous position, is rotated into position. This position will be used later when starting the performance.
This is the position where the pick-up plate 23b comes into contact and stops when it rotates toward you.

At the same time, the rack drive gear 15
drive it toward you. As shown in FIG. 9, the rack 16 has its cam portion 16a engaged with the protrusion 41b of the lock bar 41, and the slide base 9 is integrally moved toward the front so that the record is in the state shown in FIG. When the board replacement position is reached, the motor 22 is stopped by operating the limit switch S4 (see FIG. 6).

Immediately before the slide base 9 stops, the pin portion 37a of the reset lever 37 is rotated clockwise by the rising portion 4a of the chassis 4, and as shown in FIG. Regardless of the state of
are in contact with each other and the relative angle is regulated. In this position, the chevron portion 36a is off the trajectory of the record detection pin 40 and does not come into contact with it.

() Record replacement position (B) → Playing position (C) When a record is installed and the start/stop switch S6 is pressed, the motor 22 rotates the rack drive gear 15 clockwise, and at the same time, the phono motor 7 rotates the turntable. Rotate 44.

The rack 16 begins to move toward the back of the player cabinet, but the pin 41b of the lock bar 41 is restricted from moving in the lateral direction by a guide cam 42 fixed to the chassis 4, and the cam portion 16a of the rack 16 is prevented from moving in the lateral direction. Since the slide base 9 cannot be released from the rack 16, the slide base 9 also starts moving integrally with the rack 16.

The reset lever 37 is connected to the rising portion 4a of the chassis 4, as shown in FIG. 11A→B.
The engagement with the record detecting lever 36 is released, and the chevron-shaped portion 36a of the record detecting lever 36 is set at a position where it can engage with the record detecting pin 40.

By installing the record R, the 12th
Since the record detection pin 40 is already in the lowered position as shown in FIG. 11B→B, as the turntable 44 rotates, the record detection pin 40 is moved to the record detection lever Reverse 36.

When the slide base 9 reaches the performance position, as shown in FIG. 13, the end 36d of the record detection lever 36 engages with the notch of the guide cam 42 to prevent the slide base 9 from moving. do.

Here, if the diameter of the installed record is 30
cm, the outer periphery of the record comes into contact with a roller 34 fixed to an index cam 33 and rotates it, as shown in the figure. This position is located at the end 23 of the pick-up plate 23.
This is the position where the locus a comes into contact with the small diameter portion of the index cam 33.

The pin 41b of the lock bar 41 is connected to the rack 16.
The component force received from the inclined surface of the cam portion 16a pushes up the inclined portion of the guide cam 42 against the biasing force of the spring 46, and the cam portion 16a
Since the rack 16 comes into contact with the straight line portion of the slide base 9, the rack 16 can freely slide on the slide base 9.

If a roller is used for the pin 41a of the lock bar 41, the load on the motor 22 is reduced.

The slide base 9 is urged upward in the figure by a spring 46, and the guide cam 42
Record detection lever 3 engaged with the notch of
6, it is held in the playing position without any play.

() Tone arm lead-in The drive plate 28 and lead-in latch 29 are connected to the pin 24 embedded in the pick-up plate 23.
14 by holding the
Drive the tone arm 5 in the direction shown by the arrow in the figure.
Rotate to the playing start position.

In the case of a 30 cm diameter record, the end 23a of the pick-up plate 23 is located at the index cam 33 as shown in the figure.
In other cases, the index cam is in contact with the tip (large diameter part) of the index cam.

When drive plate 28 is further driven, lead-in latch 29 reverses and disengages pin 24, causing drive plate 28 to move as shown in FIG. 15A.
The protrusion 28c is the protrusion 3 of the index cam 33.
3a and rotate it to move the roller 34 away from the outer periphery of the record so that it does not have an adverse effect during playing.

Next, as shown in FIG.
The elevation shaft 2 is lowered by the action of the cam portion 28a of No. 8, the tone arm 5 is lowered onto the record disc, and the performance is started.

Once the tone arm has been lowered, limit switches S ₁ and S ₂ are activated, as shown in Figure 6.
is turned off and the motor 22 stops.

() Return of Tone Arm When the performance ends and the tone arm reaches the lead-out groove of the record, the well-known performance end detection circuit starts the motor 22 and rotates the rack drive gear 15 counterclockwise.

As a result, the crank 43 moves the drive plate 28,
The pin 24 of the pick-up plate 23 is driven at the end of the drive plate in the direction shown by the arrow in FIG.
Press to rotate the tone arm 5 clockwise.

() Playing position (C) → Record changing position (B) At the same time, the rack 16 is also driven, but the lock bar 41 supported by the slide base 9 is
Since movement in the lateral direction is restricted by the straight part of the cam part 16a of the rack 16, the pin 41b of the lock bar 41 cannot escape from the inclined part of the guide cam 42, and the slide base 9 does not move. Only the rack 16 slides.

After the tone arm 5 reaches the storage position, the first
6 As shown in Figure B, the cam portion 16 of the rack 16
The groove part a allows the lock bar 41 to rotate, and the slide base 9 also moves integrally to the record exchange position.

() Repeat and Elevation If you want to repeat the performance, turn on switch S7 on the operation panel, then turn start/stop switch S at the record changing position.
Even if you do not press 6, you can move on to the performance operation again.

If a mechanism (for example, a photoelectric switch) is added to detect when the tone arm 5 has reached the storage position, the rotation of the motor 22 is reversed and the tone arm is lead-in.
The time required for repeat operations can be reduced step by step.

To perform manual elevation, the drive plate 28 may be configured to reciprocate between the elevation completion position and the elevation completion completion position in FIG. 6B.

() Record replacement position (b)→storage position (a) When the record is removed from the record replacement position and the start/stop switch S6 is pressed, the rack drive gear 15 rotates clockwise.

At this time, the record detection lever 36 has been reset as shown in FIGS. 9 and 11A, as described above, and the slide base 9
11B, and the locking portion 36b of the detection lever 36 engages with the lock bar 41.
The lock bar 41 is locked by engaging with the protrusion 41a of the lock bar 41.

In this state, the slide base 9 moves together with the rack 16 and reaches the playing position, but since no record is placed on it, the record detection lever 36 remains in the state shown in FIG. The end portion 36d does not engage with the notch of the guide cam 42, and the lock bar 41 moves further together to reach the storage position without coming out of the groove of the cam portion 16a of the rack 16.

After the slide base 9 passes the performance position,
Its right end contacts the cam portion 35a of the pick-up stopper 35 and rotates it to the position shown by the solid line in the figure, and its end engages with the pick-up plate 23 to prevent rotation of the tone arm.

The drive plate 28 is driven in the direction shown by the arrow in the same figure as when the performance starts, but since the pickup plate 23 is prevented from rotating, the lead-in latch 29 reverses and releases the engagement pin 24. , the tone arm 5 is held in the storage position.

Since the rack drive gear and the number of teeth of the rack are appropriately selected, the motor 22 stops at the 6th gear.
As shown in the chart of FIG. B, control can be performed when limit switches _S1 and _S2 are turned off, similar to the start of a performance.

() Sub-turntable storage prevention device When the sub-turntable 45 is attached and the start/stop switch S6 is pressed without placing a record, the slide base 9 will move toward the back of the player cabinet. I'm going, but
Because the record detection pin 40 is not lowered,
The slide base 9 does not stop at the performance position, but moves further toward the back.

Then, as shown in FIG. 7, the safety switch S5 is pressed to stop the motor 22. Then, when the start/stop switch S6 is further pressed, the slide base 9 moves to the record loading/unloading position.

Also, when the sub-turntable 45 presses the safety switch S5, the motor 22 reverses,
It is also possible to configure the slide base 9 to return to the record loading/unloading position, which is much more convenient in practice.

As explained above, the record player of the present invention includes a guide member and a pickup holding device that slidably support a slide base on which a turntable is installed on a chassis supported by a player cabinet via a vibration isolating member. By fixing them together, the relative positions of the pick-up and turntable can be accurately determined.

Furthermore, the operating switch is directly fixed to the player cabinet, and a guide member and a pick-up holding device are provided that slidably support the slide base on a chassis that is supported by the player cabinet via a vibration isolator. By fixing the needle, vibrations are not transmitted to the pick-up and turntable when the operation switch is operated, and there is no risk of needle skipping.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the bookshelf-type record player of the present invention stored in a bookcase, Fig. 2 is a perspective view of the slide base moved to the record exchange position, and Fig. 3 is 4 is a plan view of the player cabinet excluding the top plate and arm base, FIG. 5 is a front view thereof, and FIG. 6A is a layout diagram of the limit switch. Figure B is the timing chart, Figure 7 is an explanatory diagram of the operation of the safety switch, Figure 8 is an explanatory diagram showing the related operation between the drive plate and the crank, and Figure 9 is the diagram at the record changing position. A plan view, FIG. 10 is an explanatory diagram showing the resetting of the record detection lever, FIG. 11 is an explanatory diagram of the operation of the record detection lever when moving from the record replacement position to the playing position, and FIG. 12 is an explanatory diagram showing the resetting of the record detection lever. FIG. 13 is an explanatory diagram of the operation of the record detection pin when the record detection pin is placed, and FIG.
Figure 4 is a plan view showing the locked state of the slide base and the lead-in operation of the tone arm.
Figures A and B are a plan view and a side view respectively showing a state in which the lead-in operation of the tone arm is completed;
FIG. 16A is a plan view showing the return movement of the tone arm, FIG. 16B is an explanatory view showing the engagement between the slide base and the rack, and FIG. 17 is an explanatory view when moving to the storage position. . 1...Player cabinet, 2a...Circuit section provided with operation switches S6, S7, S8 and S9,
3... Vibration isolator, 4... Chassis, 5... Tone arm, 6... Arm base, 7... Phono motor, 8...
Turntable bearing, 9...Slide base, 1
0, 11, 12, 13, 14...Guide roller, S
6...Start/stop switch.

Claims (1)

[Claims] 1. A guide member and a pick-up holding device that slidably support a slide base on which a turntable is installed are fixed to a chassis supported by a player cabinet via a vibration isolator. Features a record player. 2. A guide member that fixes an operation switch to the player cabinet and slidably supports a slide base on which a phono motor and a turntable are installed on a chassis supported by the player cabinet via a vibration isolator. A record player characterized in that a pick-up holding device is fixed.