JPS6224870B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small, so-called bookshelf-type record player, and its features include a slide base that is supported so as to be movable in the front and rear directions with respect to the player cabinet; The rack is provided with an approximately triangular-shaped engaging portion where the front slope is steeper than the rear slope, and the lock pin is selectively engaged with both engaging portions to control movement of the slide base and the rack. This is the point I made.

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 order to improve the above-mentioned drawbacks of the conventional device, the present inventors invented a record player in which the turntable shaft was supported so as to be movable in the front and rear directions with respect to the player cabinet, and have already applied for a patent for the record player. (Unexamined Japanese Patent Publication No. 56-140501, 140502, 140550~
140561, 145558, 145563, 57-37704, 37761~
(See No. 37770).

The purpose of this invention is to obtain a slide base and rack drive control mechanism for use in such a record player.
The object of the present invention is to reliably switch the drive of both moving members using a simple mechanism.

The basic operation of this invention will be explained with reference to FIGS. 1 to 14.

Figure 1 shows a bookshelf-type record player P of the present invention with a tuner T of uniform size.
and Integrated Amplifier A, stacked together 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 1 moved from the storage position to the front record exchange position.

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 the storage position (a) to the record changing position (b) to the playing position (c), (d) → Record replacement position (b) → ((c), (d) → (b) →...
…)→Move as shown in storage position (a).

In the storage position (a), the slide base 1 and the rack 5 are inside the player cabinet,
Lock pin 7a engages rack 5. The turntable axis is located at A in the diagram, and the tone arm
The TA rotates to 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 and come to the playing position (c). At this time, the lock pin 7a moves and 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 forward (d) and lowered at the introduction groove position of the 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 to the 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.

After replacing the record, press the start/stop switch 101, and as before, move to the playing position (c), lead the tone arm in (d), finish playing, and return to the record changing position (b). Repeat the motion of moving and stopping.

To move slide base 1 to the storage position (a), remove the record (if using sub turntable ST, also remove this), press the start/stop switch, and slide base 1 will move toward the back. It moves to the storage position (A) and stops without stopping at the playing position (C) (the lock pin remains loosely engaged and does not move).

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 2 that comes into contact with the index cam 26 to determine the rotational position of the tone arm.
1a and a pin 21b that engages with the drive plate 6 is 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 meshing 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 against which a cam 4d provided on the chassis 4 comes into contact 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.

() Storing position (A) → Record replacing position (B) In the state shown in Fig. 4, when the start/stop switch 101 is pressed, the motor 2 starts and the rack drive gear 3 is rotated counterclockwise. Rotate.

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, the protrusion 1c on the rear end of the guide wall 1a as shown in FIG. 6A→B
The lock lever 7 comes into contact with the pin 8c of the lock lever reset plate 8, rotates the lock lever reset plate counterclockwise, and biases the lock lever 7 connected by the click spring 7b clockwise.

When the slide base 1 reaches the record changing position, the reset plate 10 is opened as shown in FIG.
The pin 10a is connected to the cam 4 provided on the chassis 4.
d, the reset plate 10 rotates clockwise and resets the record detection lever 9.

However, in this position, the record detection lever 9
The chevron portion 9a is located away from the rotation locus of the record detection pin 11 provided on the turntable, and this prevents the record detection pin 11 from accidentally falling onto the chevron portion 9a of the record detection lever. It is prevented.

The end 29a of the reset lever 29 reaches the end of the slide base cover 30, and as shown in FIG.
The index cam 26 rotates counterclockwise with the force of
The index cam 26 and the size detection lever 28 are reset by contacting the protrusion 26b of the index cam 26 and the size detection lever 28.

This rotational position of the index cam 26 is a position where the trajectory of the end portion 21a of the pickup plate 21 comes into contact with the large diameter portion of the index cam 26.

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 in the opposite direction from the front. The turntable begins to move backwards and the turntable begins to rotate.

By placing the record R, the record detection pin 11 descends as shown in FIG.
Further, the reset plate 10 separates from the cam 4d and rotates the record detection lever 9 counterclockwise (see Fig. 7), and 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 counterclockwise. Rotate the detection lever 9 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 slide base 1 comes to the performance position (c),
The lock pin 7a of the lock lever 7, which has already been reset and biased clockwise, enters the notch 1b of the guide plate 1a, locks the slide base 1, and locks the rack 5, as shown in FIG. 6C. Release the lock.

30 records placed on the turntable
When the diameter is cm, as shown in Figure 10,
The edge of the record comes into contact with the roller 28a of the size detection lever 28 and rotates, and in conjunction with this, 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 (d) Even when the slide base 1 stops, the motor 2 continues to rotate, and as shown in FIG. 6D, the unlocked rack 5 moves forward.
A drive plate 6 connected to the elongated hole 5a by a pin 6a rotates counterclockwise.

As shown in FIG. 11, the drive plate 6 is connected to the pick-up plate 2 by a lead-in latch 25.
Grasp the pin 21b of No. 1 and rotate it toward you.

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

When the drive plate 6 further rotates, the lead-in latch 25 reverses and releases the pin 21b, as shown in FIG.
presses the protrusion 26c of the index cam 26,
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.

() Tone arm return When the tone arm reaches the lead-out groove, motor 2 is started by the well-known performance end detection circuit.
The rack drive gear 3 rotates 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 to clamp the pin 21b of the pick-up plate 21.

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

() Playing position (C) → Record changing position (B) As explained in detail in (), the slide base 1 rotates the lock lever reset plate 8, the reset plate 10, and the reset lever 29, respectively. While resetting, move to the record replacement position (b).

() Record replacement position (B)→Storage position (A) 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 1 is in the raised position, the record detection lever 9 is in the reset position and the first
As shown in Figure 4B, press the record detection lever 9.
The pin 9b contacts the hook 8a of the lock lever reset plate 8 and rotates 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 that the slide base 1 is
It moves to the storage position (A) and stops without stopping at the playing position (C).

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

What is shown in FIGS. 15 to 18 explains the basic operation of the present invention.

The most important difference from the previous embodiment is that the lock lever reset plate is eliminated and the lock lever 10 is removed.
7 (clockwise and counterclockwise) is received from the inclined surfaces of the slide base and the engaging portion of the rack.

The lock lever 107 has lock pins 107a and 107b that engage with engaging portions 104 and 105 of the slide base and rack, respectively.

Further, the lock lever 107 has a long hole 107
It is supported by the chassis by a pin 4e inserted through C, and is biased rearward (upward in the figure) by a spring 106.

Slide base and rack engagement portion 104,
105 is a surface 104 that is substantially perpendicular to the direction of movement in front.
a, 105a, and a rear inclined surface 104b,
105b.

The record detection lever 109 has a chevron portion 109a that contacts the record detection pin 11, an end portion 109b that covers the engaging portion 104 of the slide base, and a protrusion portion 109c that contacts the protrusion portion 4f of the chassis in the playing position. ing.

The other mechanisms are almost the same as those of the previous embodiment.

The operation will be briefly explained.

() Storage position (A)→Record replacement position (B) In the storage position shown in FIG. 16, the lock pin 107b engages with the engaging portion 105 of the rack and locks the rack 5. Therefore, when the rack drive gear rotates counterclockwise, only the slide base starts moving forward.

Since the record detection lever 109 is in the reset position and its end 109b covers the engagement part 104 of the slide base, the lock pin 107a does not engage as shown in FIG.
The slide base reaches the record changing position and stops.

() Record replacement position (B) → Playing position (C) When a record is placed on the turntable, the record detection pin lowers and comes into contact with the chevron portion 109a of the record detection lever, as shown in Fig. 18. Then, the record detection lever 109 is rotated clockwise and its end 109b is displaced from the engagement part 104 of the slide base, so when the slide base comes to the playing position (c), the lock pin 107a is moved to the engagement part 104. engage.

Then, the slide base stops, the lock pin 107b disengages from the engaging portion 105 of the rack, and the rack 5 begins to move forward.

The protrusion 109c of the record detection lever 109 comes into contact with the protrusion 4f of the chassis, and the spring 10
6 (via the lock pin 107a) to force the slide base rearward and firmly fix it in the playing position.

As described in detail above, Rack 5 causes the tone arm to lead in, stops at the position shown in FIG. 15D, and begins playing.

() Completion of performance → Record replacement position (B) When the end of performance is detected and the rack drive gear rotates counterclockwise again, the rack moves backward and reaches the rear end while returning the tone arm.

The lock lever 107 is biased counterclockwise by the force that the lock pin 107a receives from the inclined surface 104b of the engagement part of the slide base.
to stop the rack and move the slide base forward instead.

While moving forward, the slide base resets the record detection lever 109 (that is, covers the engaging part 104 with the end 109b) and stops at the record exchange position (b).

() Record replacement position (B) → Storing position (A) When the record is removed and the slide base is moved backwards, the record detection pin does not go down, so the record detection lever cannot be moved to the position shown in Figure 17. If the player remains in the same position, the slide base does not stop at the performance position (B), but moves to the storage position (A) and stops.

In the above embodiment, the engaging portions provided on the slide base and the rack are approximately in the shape of a right triangle, but this is not necessarily necessary, and the slope at the front is steeper than that at the rear. Any triangle that exists is sufficient.

As explained above, in the record player of the present invention, the lock pin is engaged with the approximately triangular-shaped engaging portion provided on the slide base and the rack and whose front slope is steeper than the rear slope. Therefore, the lock pin can be swung and switched by the component force received from the inclined surface of the engaging part, and a simple mechanism can reliably switch the drive between the slide base and the rack. .

[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 shows the slide 4 is a plan view of the entire internal mechanism; FIG. 5 is a front view; FIG. 6 is a diagram illustrating the operation of the slide base and rack; FIG. 7 is an explanatory diagram showing the reset of the record detection lever, and FIG.
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. 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. , 15th
16 is a plan view of the main part, and FIGS. 17 and 18 are explanatory diagrams of the operation. 104...Engaging portion of slide base, 105...
... Rack engaging part, 106 ... Spring, 10
7...Lock lever, 107a, 107b...Lock pin, 109...Record detection lever, 10
9b... End portion covering the engaging portion 104, 109c...
A protrusion that comes into contact with the protrusion 4f of the chassis.

Claims (1)

[Scope of Claims] 1. (a) A slide base supported so as to be movable in the front-rear direction with respect to the player cabinet, and (b) A slide base that is driven by a rack drive gear provided on the slide base and that is parallel to the slide base. (c) a lock pin swingably supported by the player cabinet; and (d) a rack provided on the slide base and the rack with the lock pin in between, so that the front slope slopes backward. an engaging portion having a substantially triangular shape that is steeper than the slope of the rack, and the lock pin selectively engages with the engaging portion of the slide base and the rack to stop movement of the slide base or the rack. A record player featuring 2. The record player according to claim 1, wherein the engaging portions provided on the slide base and the rack have a substantially right triangular shape.