JPH0239031B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a small so-called bookshelf type record player, and its feature is that a slide base and a rack are movable in the front and rear directions with respect to the player cabinet. By supporting the rack and driving the rack using a rack drive gear provided on the slide base, the player cabinet can be made smaller, and it is also possible to control the stop position of the slide base and the operation of the tone arm. This is something that has become easier to do.

In the past, commonly used record players had a turntable placed in the center that was slightly larger than the largest diameter record, resulting in a fairly large player cabinet.

In order to improve these drawbacks of conventional devices, the inventors of the present invention have invented a record player in which the turntable shaft is supported so as to be movable back and forth relative to the player cabinet, and have already filed a patent application for this record player. (Special application 1984-44241-44254,
47996, 47997, 112687-112697).

However, in the above invention, since the rack was supported on the slide base, the slide base became heavy and the design of the drive device and stop control device was difficult.

It is an object of the present invention to provide a slide-based drive and control mechanism for use in such a record player that is compact and lightweight, and in which the attached mechanism is easy to design.

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

FIG. 1 shows a bookshelf type record player P of the present invention stacked with a tuner T and an integrated amplifier A of the same 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).

Figure 2 shows its appearance, with the front cover opened and the slide base 1 moved from the storage position to the record exchange position in the front.

A turntable with a diameter slightly smaller than the depth of the player cabinet is installed on the slide base, and this is sufficient for practical use, but if you want to obtain even higher performance, you can use a large ring-shaped turntable. The sub-turntable ST can be stacked on top of each other.

The related operations of the slide base 1, rack 5, and tone arm TA will be outlined with reference to FIG.

The slide base 1 and the rack 5 are supported so as to be movable in the front and rear directions with respect to the player cabinet, and are driven by a motor 2 provided on the slide base 1, and a lock pin 7a is selectively engaged. It is designed to prevent that movement.

Movement of slide base 1 and tone arm
All rotations of the TA can be operated simply by pressing the start/stop switch 101, and the slide base moves from storage position A → record exchange position B → playing position C, D → record exchange position L →
(C, D→B→...)→Move as shown in storage position A.

In the storage position A, the slide base 1 and the rack 5 are in the player cabinet and the lock pin 7a is engaged with the rack 5. The turntable axis is located at A in the diagram, and the tone arm TA
is rotating at the back of the turntable.

Open the front cover and press the start/stop switch 10.
When 1 is pressed, the rack is locked and does not move, and the slide base 1 moves forward, and when it reaches the record exchange position B, the motor 2 stops and stops moving.

At this time, the turntable shaft is located at B in the figure.

At this position, attach the sub-turntable ST if necessary, place the record R on it, and press the start/stop switch 101. The slide base will move in the opposite direction to the front, and when it comes to the playing position C. , the lock pin 7a moves, engages with the slide base, and stops.

At this time, the turntable shaft is located at C in the figure.

Motor 2 continues to rotate and moves the now free rack 5 forward.

A tone arm control mechanism is provided at the rear end of the rack 5, and the tone arm is rotated toward the front and lowered at the introduction groove position of the second record to start playing.

When the performance ends and the tone arm reaches the lead-out groove, the rack 5 moves in the opposite direction in front, raises the tone arm, and rotates it to the back of the turntable again.

When the rack moves to the innermost position, the lock pin 7a moves and engages with the rack, and then the slide base moves forward, and the motor 2 stops at the record exchange position B to stop the movement.

When the record is replaced and the start/stop switch 101 is pressed, the operation of moving to the playing position C, leading the tone arm in, finishing playing, moving to the record changing position B, and stopping is repeated, as before. .

To move slide base 1 to storage position A, remove the record (sub turntable
If ST is used, this is also removed), and when the start/stop switch is pressed, slide base 1 moves toward the back without stopping at the playing position C (the lock pin remains easily engaged and can be moved). ), moves to storage position A and stops.

The internal mechanism will be explained in detail.

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

Inside the player cabinet, an operating switch and a circuit section (not shown) are provided in the upper part, and a chassis 4 is supported in the lower part via a vibration isolator.

The chassis 4 is provided with an arm base that supports the tone arm TA and an automatic mechanical part that controls the tone arm.
and a rack 5 are supported so as to be slidable in the front and back direction.

A pick-up plate 21 that rotates integrally is fixed to the tone arm TA, and the pick-up plate has an end portion 21 that comes into contact with an index cam 26 to determine the rotational position of the tone arm.
A and a pin 21b that engages with the drive plate 6 are provided.

An elevation seat 22 for vertically moving the tone arm is supported on the arm base 32 so as to be vertically movable by an elevation shaft 23.
The lower end of the elevation shaft is in contact with an elevation cam portion 24 provided on the drive plate 6.

The drive plate 6 is provided with a lead-in latch 25 click-biased by a leaf spring 33 and a pin 6a inserted into the long hole 5a of the rack 5.

Further, the arm base 32 is provided with a well-known mechanism consisting of a lamp and a photoelectric conversion element that detects when the performance of a record has ended.

An index cam 26 having a stepped cam portion that determines the lead-in position of the tone arm is pivotally supported by the chassis 4.

The index cam 26 also has a shaft inserted into the elongated hole 28a of the size detection lever 28 on the top surface.
A protrusion 26 on the lower surface that comes into contact with the reset lever 29
b, and the side surfaces thereof are each provided with a protrusion 26c that comes into contact with the drive plate 6.

The reset lever 29 is biased counterclockwise by a spring 31, and between the storage position and the performance position, the end 29a abuts the cover 30 of the slide base and the protrusion 26b of the index cam 26. , and the index cam 26 and size detection arm 28 are free to operate.

When the record disc is in the record exchange position, it falls into the notch in the slide base cover, rotates counterclockwise, comes into contact with the protrusion 26b of the index cam 26, and moves the size detection arm 28 to the reset position.

A rack drive gear 3 that meshes with a rack 5 is pivotally supported on the slide base and is driven by a motor 2 via a speed reduction mechanism.

A record detection lever 9 and a reset plate 10 are pivotally supported on the slide base, and both are connected and interlocked by a reversing spring.

The record detection lever 9 is provided with a chevron portion 9a that comes into contact with the record detection pin 11 provided on the turntable when it comes down due to the weight of the record, and a pin 9a that engages with the hook 8a of the lock lever reset plate 8. ing.

The reset plate 10 is biased counterclockwise by a spring and includes a pin 10a that comes into contact with a cam 4d provided on the chassis 4 when the slide base reaches the record replacement position.

Lock lever 7 having a lock pin 7a at the tip
is pivotally supported on the chassis 4, and the lock pin 7a is inserted into the notch 1b provided in the middle of the guide wall 1a of the slide base 1 and the slide groove 5c of the rack 5.
selectively engages with a recess 5d provided at the lower end of the holder.

The lock lever 7 is connected by a click spring 7b to a coaxially supported lock lever reset plate 8, and is urged to rotate to the two positions.

The lock lever reset plate 8 is provided with a hook 8a that engages with the pin 9b of the record detection lever 9, a hook 8b that engages with the protrusion 5b of the rack 5, and a pin 8c that engages with the cam surface of the guide wall 1a. ing.

Next, its operation will be explained.

() Storage position A→Record replacement position B In the state shown in FIG. 4, when the start/stop switch 101 is pressed, the motor 2 starts and rotates the rack drive gear 3 counterclockwise.

At this time, since the rack 5 is locked by the lock pin 7a, as clearly shown in FIG. 3A, the slide base 1 begins to move forward.

As the slide base moves, from A to B in Figure 6
As shown in FIG.
The lock lever reset plate is rotated counterclockwise, and the lock lever 7 connected by the click spring 7b is biased clockwise.

When the slide base 1 reaches the record exchange position, the pin 10a of the reset plate 10 comes into contact with the slope of the cam 4d provided on the chassis 4, as shown in FIG. 7, and the reset plate 10 moves clockwise. Rotate to reset the record detection lever 9.

However, in this position, the chevron portion 9a of the record detection lever 9 is located away from the rotation locus of the record detection pin 11 provided on the turntable, and the record detection pin 11 may be accidentally
This prevents the record detection lever from falling onto the chevron-shaped portion 9a.

When the end 29a of the reset lever 29 reaches the end of the slide base cover 30, the reset lever 29 is rotated counterclockwise by the force of the spring 31, as shown in FIG. 26b to reset the index cam 26 and size detection lever 28.

This rotational position of the index cam 26 is such that the trajectory of the end 21a of the pick-up plate 21 is
This is the position where the large diameter portion of the index cam 26 comes into contact.

At the same time, a limit switch (not shown) operates to stop the motor 2 and the slide base to stop.

() Record replacement position B → Playing position C When a record is installed and the start/stop switch 101 is pressed, the motor 2 rotates the rack drive gear 3 clockwise, and the slide base 1 moves backward, opposite to the front. Once it starts moving, the turntable starts rotating.

By placing the record R, as shown in FIG. 9, the record detection pin 11 is lowered, the reset plate 10 is separated from the cam 4d, and the record detection lever 9 is rotated counterclockwise ( (See FIG. 7), the record detection pin 11 comes into contact with the chevron portion 9a of the record detection lever 9, and the record detection lever 9 is rotated from the dotted line to the solid line position in FIG. 13A.

As a result, even if the slide base moves rearward, the pin 9b of the record detection lever 9 does not engage with the hook 8a of the lock lever reset plate 8.

When the slide base 1 comes to the playing position C, the lock pin 7a of the lock lever 7, which has already been reset and is biased clockwise, moves into the notch 1b of the guide wall 1a, as shown in FIG. 6C.
into the rack, lock the slide base 1, and lock the slide base 5.
Release the lock.

A record placed on a turntable
When the diameter is 30 cm, the edge of the record contacts and rotates the roller 28a of the size detection lever 28, as shown in FIG.
The index cam 26 rotates clockwise.

At this position, the trajectory of the end 21a of the pickup plate 21 comes into contact with the small diameter portion of the index cam 26.

() Tone arm lead in Even though the slide base 1 stops, the motor 2 continues to rotate, and as shown in FIG. 6D, the unlocked rack 5 moves forward and engages the elongated hole 5a. Drive plate 6 connected with pin 6a
rotates counterclockwise.

As shown in FIG. 11, the drive plate 6 grips the pin 21b of the pick-up plate 21 with the lead-in latch 25 and rotates it toward the front.

The pick-up plate 21 has an end 21
a comes into contact with the small diameter part or the large diameter part of the index cam 26 depending on the size of the record on the turntable (that is, depending on the rotational position of the index cam 26) and stops, and the tone arm is introduced. Position above the groove.

When the drive plate 6 further rotates, the lead-in latch 25 reverses and releases the pin 21b, as shown in FIG. Push and rotate the index cam and size detection lever 28 to move the roller 27 away from the edge of the record.

Next, the elevation seat 22 is lowered by the cam portion 24 of the drive plate 6, the tone arm is lowered onto the record, and the performance begins.

As shown in FIG. 6D, the lock lever reset plate 8 is rotated clockwise when its hook 8b comes into contact with the convex portion 5b of the rack 5, and the lock lever 7 is urged counterclockwise. are doing.

() Return of tone arm When the tone arm reaches the lead-out groove, the motor 2 is activated by a well-known performance end detection circuit, and the rack drive gear 3 is rotated counterclockwise.

As a result, the rack 5 moves in the opposite direction to the front, rotates the drive plate 6 clockwise, pushes the pin 21b of the pickup plate 21, and rotates the tone arm to the storage position.

At this time, the pin 25a protruding from the lead-in latch 25 comes into contact with the end 4c of the chassis, and the lead-in latch 25 rotates counterclockwise.
Hold b.

When rack 5 reaches the rear end, lock pin 7
a enters the recess 5d provided at the lower end of the slide groove 5c, locks the rack 5, and releases the lock of the slide base 1.

() Playing position C→Record replacement position B As explained in detail in (), the slide base 1 replaces the record by rotating the lock lever reset plate 8, reset plate 10, and reset lever 29, respectively. Move to board replacement position B.

() Record replacement position B→Storage position I When the record is removed and the start/stop switch 101 is pressed, the slide base 1 starts moving backward.

Since the record detection pin 11 is in the raised position, the record detection lever 9 is in the reset position, and the pin 9b of the record detection lever 9 comes into contact with the hook 8a of the lock lever reset plate 8, as shown in FIG. Rotate the lock lever reset plate clockwise.

Then, the lock lever 7 is biased counterclockwise and the lock pin 7a remains in the recess 5d of the rack 5, so the slide base 1 moves to the storage position A without stopping at the playing position C. and stop.

In the above embodiment, the motor that drives the slide base and the rack is provided separately from the phono motor, but it is also possible to use a single motor for both, which makes the slide base lighter and smaller. It is advantageous to be able to

As explained above, in the record player of the present invention, the slide base can be moved to three positions: the storing position, the playing position, and the record changing position, simply by selectively locking the slide base and the rack to the player cabinet. It can be stopped as appropriate,
In addition, when the slide base is stopped, the rack can be moved continuously, and an extremely simple mechanism allows continuous switching drive to be performed using the same drive source, making the player cabinet revolutionary. Since it can be made small and the moving parts can be made small and lightweight, it has the effect of facilitating the design of the drive mechanism and stop control mechanism.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the bookshelf-type record player of the present invention housed in a bookcase, Fig. 2 is a perspective view of the slide base moved to the record exchange position, and Fig. 3 is a perspective view showing the bookcase of the present invention. A schematic explanatory diagram of related operations. FIG. 4 is a plan view of the entire internal mechanism. FIG. 5 is a front view. FIG. 6 is an explanatory diagram of the operation of the slide base and rack. FIG. 7 is a record detection Explanatory diagram showing resetting the lever, No. 8
9 is an explanatory diagram of the operation of the tone arm control mechanism at the record changing position, FIG. 9 is an explanatory diagram of the operation of the record detection pin, FIG. 10 is an explanatory diagram of record size detection at the playing position, and FIG. 11 and 12 are explanatory diagrams of the operation of the tone arm control mechanism showing the lead-in operation of the tone arm, and FIGS. 13 and 14 are explanatory diagrams of the sliding section switching operation corresponding to the presence or absence of a record, respectively. It is. 1...Slide base, 2...Slide base drive motor, 3...Rack drive gear, 7...Lock lever, 7a...Lock pin.

Claims (1)

[Claims] 1. A slide base on which a turntable shaft is installed is movably supported between a storage position, a performance position in front of the storage position, and a record exchange position in front of the performance position, and A rack driven by a rack drive gear is supported movably in parallel with the slide base, and the slide base and the rack are selectively locked to the player cabinet. record player.