JPS6355146B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small-sized, so-called bookshelf-type record player, and is characterized by the fact that in order to make the player cabinet smaller, the turntable bearing part is mounted on the front cover. It is movably supported between a storage position, a playing position, and a record changing position, which are arranged in the front and rear directions of a type player cabinet.When in use, the front cover is opened,
In a record player in which the turntable bearing is moved forward from the storage position inside the player cabinet, the power switch is made conductive in conjunction with the opening of the front cover, reducing the number of operating steps. This is the point.

Conventionally, commonly used record players have a turntable, which is about the same size as the largest record disc, placed approximately in the center of the depth of the player cabinet. It was considerably larger than the largest diameter record, and because it had a lid that pivoted upward, it required a considerable amount of space above the player cabinet.

An object of the present invention is to simplify the operation of a record player by making the player cabinet smaller and reducing the number of operating procedures.

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 2 and integrated amplifier 3 of uniform size and stored in a bookcase. The player cabinet measures 320mm wide, 200mm deep, and 98mm high.
Since the size of an A4 book is approximately 30cm x 21cm, they are approximately the same size and can be stored side by side without sticking out to the front of a bookcase like a conventional record player.

Figure 2 shows its appearance, with the front lid 4 opened.
The motor slide plate 5 has been moved from the storage position to the tar table attachment/detachment position in the front.
The turntable 6 is used by being attached to the motor shaft of the phono motor 7 fixed to the motor slide plate 5 only when playing, and when not playing, it is removed and the motor slide plate 5 is stored in the cabinet. ing. Also, don't use the tone arm except when playing (even when changing records).
It is designed to rotate towards the back of the player cabinet. Therefore, the depth of the player cabinet can be made much smaller than that of a 30 cm diameter record disc, as described above.

An overview of the operation of the motor slide plate will be explained with reference to FIG.

All operations of the motor slide plate 5 can be performed simply by pressing the main switch S ₀ , and can be operated from storage position (a) → turntable attachment/detachment position (b) (c) → performance position (d) → record replacement position The movement from (c) to storage position (a) is performed by the same switch operation.

In the storage position (a), the motor slide plate 5 is inside the player cabinet, and the phono motor 7
The motor shaft is located at A in the figure, and the tone arm 9 is rotated to the back of the phono motor 7.

When the front cover 4 is opened and the main switch _S0 is pressed, the motor slide plate 5 moves forward and stops at the turntable attachment/detachment position (b). The motor shaft of the phono motor is located at position B in front of the player cabinet so that the turntable 6 and record disc 8 can be easily attached and detached at this position.

At this position, attach the turntable 6 to the motor shaft of the phono motor, and place the record on it.
(c) When main switch S ₀ is pressed again, the motor slide plate moves in the opposite direction to the front, and the playing position (d) is between the storage position (a) and the turntable attachment/detachment position (b).
(The motor shaft is located at C in the diagram) and stops.
The tone arm rotates toward you and the performance begins.

When the performance is finished and you press main switch S ₀ ,
The tone arm rotates to the back of the player cabinet, and the motor slide plate moves to the front to reach the record exchange position, which is the same as the turntable attachment/detachment position (b).
Stop at (c). When you replace the record and press the main switch S ₀ , it moves to the playing position (d) and repeats the same operation.

To move the motor slide plate 5 to the storage position, remove the turntable together with the record at the record changing position (c), and turn on the main switch.
If you press S ₀ , the motor slide plate will move to the playing position (d).
It moves to the storage position (a) and stops without stopping at .

Figure 4 shows the top plate of the player cabinet and the tone arm mounting base 1 to show the internal mechanism.
5 is a plan view with 0 removed, and FIG. 5 is a side view thereof.

The front cover 4 has its lower part pivotally supported on the bottom plate of the player cabinet, and its upper part mounted on a well-known magnetic catch 3 provided on the top plate of the player cabinet.
3 (see Fig. 13) A rotation speed switching knob 11 and a main switch _S0 are provided on the inside of the front cover 4, and the front cover 4 is opened at an appropriate position on the player cabinet. A power switch S _p is provided which conducts in conjunction with the
(see figure).

The lower part of the front cover 4 is pivotally supported by the bottom plate of the player cabinet, and a rotation speed switching knob 11 and a main switch _S0 are provided on the inside thereof.

The motor slide plate 5 has sliding parts 5' provided on both sides thereof supported by three rollers each provided on a roller support base 12 fixed to the bottom plate of the player cabinet, so that it can slide in the front and rear direction. It's summery.

A direct drive type phono motor 13 is attached to the motor slide plate 5, and a mini table 14 on which a turntable is placed is fixed to the upper part of the motor shaft. The turntable 6 is made of aluminum, high-density plastic, glass, or the like.

A DC motor 15 for driving a motor slide plate 5 is provided on the bottom plate of the player cabinet, and includes a deceleration mechanism 16, a gear 17 and a crank mechanism 1.
It is connected to the motor slide plate 5 via 8.

Two limit switches S ₁ and S ₂ are provided on the bottom plate of the player cabinet adjacent to the track of the motor slide plate, and are operated by operating pieces protruding from the rear end of the slide portion of the motor slide plate.
Detects that the motor slide plate has moved to the storage position and turntable attachment/detachment position (record replacement position).

On the bottom plate of the player cabinet, located behind the motor slide plate, is the setting lever 1.
9 is rotatably supported, and on the setting lever there is a roller 20 that contacts the turntable, and a roller 20 that contacts the protrusion of the motor slide plate only when the setting lever contacts the turntable and rotates. An abutting lock plate 21 is provided and engages with the slide lever 23 by means of an engagement pin 22 provided at the opposite end of the pivot point (see FIG. 9). (See Figure 10) The slide lever 23 is biased rearward by a spring 24 applied between the bottom plate of the player cabinet and the setting lever 19.
By rotating clockwise, it slides forward,
After moving the tone arm 9 above the introduction groove of a 30 cm diameter record, operate the limit switch _S3 . (See FIG. 9) Also, there is a notch 23' at the rear end of the slide lever 23, and a knob that protrudes and retracts from this notch 23' and selectively engages with the tone arm rotation pin 25. letter-shaped click arm 26
is supported. The U-shaped click arm is the 10th
As shown in the figure, it is click-rotated between two positions by a spring 27, and as the slide lever moves, it comes into contact with stoppers P ₁ and P ₂ provided on the bottom plate of the cabinet. Rotated.

A tone arm rotating arm 30 having a tone arm rotating pin 25 at its tip is fixed to the horizontal rotating shaft of the tone arm 9, and the tone arm rotating pin is selected from the U-shaped click plate 26 of the slide lever 23. (See Figures 10-12).

An arm elevation lever 28 is supported at the right end of the player cabinet so as to be movable up and down, and its operation part 29 faces the front surface of the cabinet. Further, an arm lifter 32 having an arc-shaped arm support portion 31 near the horizontal rotation axis of the tone arm.
is provided and connected to the arm elevation lever 28.

Adjacent to the arm elevation lever 28,
A limit switch _S4 is provided and is operated by the arm elevation lever 28 when the arm elevation lever 28 is rotated counterclockwise in FIG. 5 to lower the tone arm 9.

Main switch S ₀ , limit switch S ₁ ~ _{S 4} ,
DC motor 1 that drives motor slide plate 5
5 and the phono motor 13 are connected as shown in FIG. Each switch is shown with the motor slide plate 5 in the retracted position (FIG. 4).

Since the front cover 4 is closed, the power switch S _p is turned on.
is open.

The main switch _S0 is a so-called push-type two-circuit, two-contact switch, and each time it is pressed, the polarity of the power supplied to the DC motor 15 is reversed, and the direction of rotation thereof is reversed. There is. Limit switches S ₁ , S ₂ and S ₄ are on-off switches that are normally closed and open only when operated. Limit switch S ₁ is an on-off switch that is protruded from the slide part of the motor slide plate when it is in the storage position. It is operated by an actuating piece that opens. (See Figure 4). Also, limit switch S ₃
is a changeover switch whose movable contact is normally connected to the A contact side and switches to the B contact side only when operated by the slide lever 23.

Next, its operation will be explained.

(i) Storage position → turntable attachment/detachment position When the motor slide plate 5 is in the storage position, main switch S ₀ and limit switch S ₁
~S ₄ is in the state shown in Figure 6, and the DC motor 15
And the phono motor 13 is stopped.

When the front cover 4 is opened, the power switch S _p is closed. Then, when the main switch S ₀ is pressed, the two movable contacts are switched to the left side in FIG. 6, and the DC motor 13 rotates (in this direction). ), the gear 17 rotates clockwise,
The motor slide plate slides toward you. Then, the operating piece of the motor slide plate separates and the limit switch _S1 closes.

When the turntable slides to the attachment/detachment position, the operating piece of the motor slide plate opens by operating the limit switch _S2 , and the DC motor 15 stops (see Fig. 7).

(ii) Turntable attachment/detachment position → performance position Attach the turntable 6 to the mini table 14 of the phono motor, place the record 8 on it, and press the main switch _S0.The two movable contacts will move as shown in Figure 6. Since the limit switch _S1 is already closed, the DC motor 15 rotates in the opposite direction, and the motor slide plate 5
slides towards the back.

On the way, the outer edge of the turntable 6 comes into contact with the roller 20 of the setting lever (8th
(see figure), rotate the setting lever 19 clockwise, and then the lock plate 21 of the setting lever comes into contact with the protrusion provided at the end of the motor slide plate, and the setting lever 19 rotates further. and the roller 20 is connected to the turntable 6
(See Figure 9).

As the setting lever 19 rotates, the slide lever 23 connected with the engagement pin 22 moves toward you, and the U-shaped click plate 26 of the slide lever 23 engages with the tone arm rotation pin 25 and moves. , the tone arm 30 is rotated to a position above the introduction groove of a 30 cm diameter record.

When the slide lever 23 has moved to the playing position, operate the limit switch S ₃ and switch its movable contact from the A side to the B side, so the DC motor 15 stops and the phono motor 13
starts rotating.

At this time, the end portion 26' of the U-shaped click plate 26 comes into contact with the stopper _P2 , rotates counterclockwise, and is disengaged from the tone arm rotation pin 25 (Fig. 12). reference).

Since the tone arm 9 is stopped above the lead-in groove of the record with a diameter of 30 cm, if the operating section 29 of the arm elevation lever is (manually) rotated to the lower position, the tone arm 9 will move over the record. and the performance begins. At this time, the arm elevation lever 28 is kept open by operating the limit switch _S4 , so even if the main switch _S0 is pressed by mistake during a performance, the motor slide plate will not move and the arm elevation lever 28 will not move when the record or pick-up is pressed. No damage to the cartridge.

(iii) Performance position → Record replacement position (turntable installation/removal position) When the performance is finished, operate the arm elevation lever 28 to raise the tone arm 9, and press the main switch _S0 to start the DC motor 15. rotates forward, the motor slide plate 5 moves forward, the slide lever 23 moves to the back of the player cabinet by the action of the spring 24, and the setting lever 19 rotates counterclockwise.

The slide lever moves away from the limit switch _S3 , and the movable contact switches from the B side to the A side.
The phono motor 13 stops.

The slide lever 23 has a notch 2 at the rear end.
3' to press the tone arm rotation pin 25 (first
(See Figure 2), then rotate the tone arm to the back of the player cabinet. At the same time, the end 26' of the U-shaped click plate contacts the stopper P ₁ and rotates clockwise, and the tone arm rotation pin 25 is rotated again.
(See Figure 10).

When the motor slide plate 5 moves to the record exchange position which is the same as the turntable attachment/detachment position, the limit switch _S2 is operated and the DC motor 15 is stopped.

(iv) Record replacement position→storage position In this state, if you replace the record and press the main switch _S0 , the same operation as described in (ii) will be repeated.

To move the motor slide disc to the storage position, remove the turntable 6 along with the record disc, press the main switch _S0 , the two movable contacts will switch to the right side in Figure 5, and the DC motor 15 will rotate in the opposite direction. Then, the motor slide plate 5 begins to move to the back of the player cabinet.
And this time, since there is no turntable,
Since it does not come into contact with the roller 20 of the setting lever 19 and the limit switch _S3 is not operated, it moves to the storage position and stops by operating the limit switch _S1 .

As explained above, the bookshelf-type record player of the present invention has a player cabinet of the front lid type, and the turntable bearing section has two positions: a storage position inside the player cabinet, and a performance position in front of the storage position. By supporting the player so that it can be moved between the record changing position located in front of the playing position, (a) the depth of the player cabinet can be significantly reduced;

(b) There is no need for space to open the rotating lid above;
Other audio equipment etc. can be stacked and arranged.

Furthermore, by making the power switch conductive in conjunction with the opening of the front cover, (c) the number of operating steps is reduced and the operation of the record player becomes easier.

(d) Since the power cannot be turned off unless the pick-up is in the stowed state, it is possible to prevent damper fatigue caused by turning off the power and leaving the pick-up on the record.

This has a unique effect.

In the above embodiment, the phono motor was also configured to move together, but the phono motor was fixed to the player cabinet and only the turntable bearing was movably supported when it came to the playing position. It is also possible to connect it to the phono motor only at certain times, and in this way it is possible to gradually reduce the mass of the moving parts.

Further, the limit switches S ₁ and S ₂ may be provided around the gear 17 and operated by the rotation of the limit switches S 1 and S 2 .Furthermore, the presence or absence of the turntable can be detected with a simpler configuration by using a well-known photoelectric element. can be done.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the bookshelf type record player of the present invention stored in a bookcase, Fig. 2 is a perspective view thereof, Fig. 3 is an explanatory diagram showing an outline of the operation, and Fig. 4 is a diagram showing the player A plan view of the cabinet excluding the top plate and tone arm mounting base, Figure 5 is a side view, Figure 6 is a wiring diagram of the DC motor and phono motor that drive the motor slide plate, and Figure 7 is a 8 and 9 are explanatory diagrams showing the related operations between the turntable and the setting lever. Figures 10 to 12 are diagrams showing the U-shaped click arm of the slide lever and the U-shaped click arm of the slide lever. FIG. 13, which is an explanatory diagram showing the operation related to the tone arm rotation pin, is a diagram showing the relationship between the front cover and the power switch. 5... Motor slide plate, 6... Turntable, 9... Tone arm, 13... Phrono motor, 15... DC motor that drives the motor slide plate, 19... Setting lever, 23
... Slide lever, 25 ... Tone arm rotation pin, 26 ... U-shaped click arm, 33 ... Magnetic catch, S _p ... Power switch.

Claims (1)

[Claims] 1 Install a front cover on the front of the player cabinet,
The turntable bearing part is supported movably between a storage position inside the player cabinet, a performance position in front of the storage position, and a record exchange position in front of the performance position, and the front cover A record player whose power switch becomes conductive in conjunction with the opening of the record player.