JPS6231429B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small so-called bookshelf type record player, which is characterized by an operation switch on the back side of the front cover, which is supported so that the top end falls forward when opened. By providing this, when the front cover is opened to use the record player, the operation switch comes out in a position that is easy to operate.

Traditionally, commonly used record players are
Since the operation switch is provided on the player board, the top cover must be rotated upward to use the record player, which requires a large space above the player cabinet.

An object of the present invention is to provide a player that does not require space above the player cabinet, and also allows the operation switch to come out at a position where it can be easily operated when the front cover is opened.

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 with a tuner 2 having a uniform size.
and Integrated Amplifier 3, stacked together 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 front turntable attachment/detachment position.
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 by simply pressing the main switch So.
Movements from storage position (a) to turntable attachment/detachment position (b) and (c) to performance position (d) to record exchange position (c) to storage position (a) are 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 menswitch _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 figure), and the tone arm rotates toward you to start playing.

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 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 portions 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 back 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).

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 main switch _S0 is pressed, the two movable contacts switch to the left side in Figure 6, and the DC motor 13 rotates (this direction is considered forward rotation).
, the gear 17 rotates clockwise, and 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 (see Fig. 8), rotates the setting lever 19 clockwise, and then the lock plate 21 of the setting lever is motor-slided. The setting lever 19 further rotates as it comes into contact with a protrusion provided at the end of the plate, and the roller 20 separates from the turntable 6 (see FIG. 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 26' of the U-shaped click plate 26 rotates counterclockwise with its end 26' abutting against the stopper _P2 , and the engagement with the tone arm rotation pin 25 is released (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 reverse. Rotate and motor slide plate 5
begins to move deeper into 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 book shell type record player of the present invention has a front lid type, so there is no need to take up any space above the player cabinet, and moreover, when it is opened, the top end can fall forward. Since the operation switch is provided on the back side of the supported front cover, when the front cover is opened during use, the operation switch comes out in front of the cabinet body, making it very easy to operate.

In the above embodiment, the phono motor was also configured to move, but the phono motor was fixed to the player cabinet and only the turntable bearing was moved until it reached the playing position. If the structure is such that it is connected to a phono motor, 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 the drawing]

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 A schematic explanatory diagram of the turntable attachment/detachment position, FIGS. 8 and 9 are explanatory diagrams showing the related operation of the turntable and the setting lever,
10 to 12 are explanatory diagrams showing the related operations between the U-shaped click arm of the slide lever and the tone arm rotation pin. 5... Motor slide plate, 6... Turntable, 9... Tone arm, 11... Rotation speed switching knob, 13... Phono motor, 15...
DC motor that drives the motor slide plate, 1
9...Setting lever, 23...Slide lever, 25...Tone arm rotation pin, 26...
U-shaped click arm, S ₀ ...Main switch.

Claims (1)

[Claims] 1. A record player with an operation switch on the back of the front cover, which is supported so that the top end falls forward when opened.