JPS6156575B2 - - 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 the slide base resets the index cam that controls the lead-in position of the tone arm. By using the crank to perform the reset operation immediately before stopping at the replacement position, the reset operation can be performed reliably.

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

Therefore, in this invention, in order to dramatically reduce the size of the player cabinet, a slide base equipped with a turntable smaller than that used in conventional devices is provided so as to be movable in the front and rear directions. A rack driven by a rack drive gear and supported so as to be movable in the front and rear directions relative to the slide base is appropriately engaged with the slide base to control the stop position of the slide base.

Then, the drive plate is slid by the easily engaged crank to perform lead-in and return operations of the tone arm, and the lead-in position is controlled by the index cam that rotates in contact with the record. There is.

In known automatic mechanisms, the index cam is generally reset during the return movement of the tone arm using a U-shaped lever pivotally supported on the drive plate.

However, in the record player of the present invention, as will be described in detail later, when the tone arm returns, the rack and slide lever are not yet engaged, only the rack moves, and the record is not moved. If you try to reset the index cam using the above-mentioned well-known mechanism since it is in the playing position, if there is a record with a diameter of 30 cm, it will collide with the record and cannot be reset.

An object of this invention is to provide a mechanism for reliably resetting the index cam.

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 with a diameter slightly smaller than the depth of the player cabinet is provided on the slide base. Although this is sufficient for practical use, if you wish to obtain even higher performance, a ring-shaped turntable 44 is provided. big sub turntable 4
5 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 storage position A → record exchange position B → playing position C →
Move as shown in record exchange position B → (C → B → ...) → storage position A.

In 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 will move in the opposite direction and stop at the playing position C. Then, the tone arm 5 rotates toward this side, descends at the position of the lead-in groove of the record, and begins playing. 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.

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 move to the back. Then, 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 by 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, and the lower end of the elevation shaft 26 is connected to an elevation cam portion provided on a drive plate 28. 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 is biased counterclockwise by a spring (not shown) and includes a cam portion 35a that abuts the right end of the slide base 9, and the slide base 9 is located 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 38 is activated when the slide base 9 reaches the mounting/detaching position.
a, and a spring 39
is biased counterclockwise.

The record detection lever 36 includes a chevron portion 36a that comes into contact with a record detection pin provided on the turntable when it descends due to the weight of the record;
Locking portion 36b that prevents movement of lock lever 41
and a guide cam 42 fixed to the float base 4 when rotated by the record detection pin 40.
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.

() Storage position A → Record exchange position B When the start/stop switch S6 is pressed in the state shown in FIG. 4 with the slide base 9 in the storage position, the motor 22 starts and the rack drive gear 15 is activated. Rotate counterclockwise.

As shown in FIG. 8, the crank 43 has a long hole 43b connected to a pin 3 fixed to the chassis 4.
1, and the drive pin 32 at the tip
draws a droplet-shaped trajectory, and the driving plate 28 is moved upward in the figure and placed at 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, in the remaining half-stroke,
The drive pin 32 passes through the window 28b of the drive plate 28 and does not operate 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 last stage of the above stroke, the drive pin 32 contacts the resetter 30 and rotates it counterclockwise as shown in FIG. Regardless of the position, it is rotated to the position shown by the solid line in the figure.
This position is the position at which the pick-up plate 23b comes into contact and stops when it rotates forward when the performance starts later.

At the same time, the rack drive gear 15 drives the rack 16 forward. As shown in FIG. 9, the rack 16 has a cam portion 16a engaged with a protrusion 41b of the lock bar 41, and the slide base 9
to the front, reach the record replacement position as shown in the figure, and press the limit switch S4.
(see FIG. 6) to stop the motor 22.

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 the first
As shown in Figure 0, press the record detection lever 3.
6 is reversed to the position shown in FIG. 6B regardless of its previous state, and the protrusions 37b and 36c abut against each other, thereby regulating the relative angle. 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 44. .

The rack 16 begins to move toward the back of the player cabinet, but the lock bar 41 pin 4
1b is a guide cam 42 fixed to the chassis 4
The lateral movement is restricted by the 16
Because it cannot escape from the cam part 16a,
The slide base 9 also starts moving integrally with the rack 16.

As shown in FIG. 11A→B, the reset lever 37 is positioned at a position where the engagement with the rising portion 4a of the chassis 4 is released and the chevron portion 36a of the record detection lever 36 can engage with the record detection pin 40. is set to

By installing the record R, as shown in FIG. 12 A → B, the record detection pin 40
is already in the lowered position, so the turntable 44
As the record detecting pin 40 rotates, the record detecting pin 40 reverses the record detecting lever 36, as shown in FIG. 11B→C.

When the slide base 9 reaches the playing position, the first
As seen in Figure 3, the record detection lever 36
The end portion 36d of the guide cam 42 engages with the notch portion of the guide cam 42 to prevent the slide base 9 from moving.

Here, if the diameter of the installed record is 30 cm
As shown in the figure, the outer periphery of the record comes into contact with a roller 34 fixed to an index cam 33, causing it to rotate. This position is
This is the position where the trajectory of the end portion 23a of the pick-up plate 23 abuts against the small diameter portion of the index cam 33.

The pin 41b of the lock bar 41 is pushed up to the inclined part of the guide cam 42 against the urging force of the spring 46 by the force received from the inclined surface of the cam part 16a of the rack 16, and comes into contact with the straight part of the cam part 16a. , Rack 16 is slide base 9
It can be slid freely against.

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 supported by a spring 46.
The record detecting lever 36, which is urged upward in the figure and is engaged with a notch in the guide cam 42, holds the record detecting lever 36 in the playing position without play.

() Tone arm lead-in The drive plate 28 and the lead-in latch 29 clamp the pin 24 implanted in the pick-up plate 23, and move in the direction shown by the arrow in FIG. and rotates the tone arm 5 to the performance start position.

In the case of a record with a diameter of 30 cm, this playing start position is the position where the end 23a of the pick-up plate 23 comes into contact with the small diameter part of the index cam 33, as shown in the figure; This is the position where it comes into contact with the tip (large diameter part) of the cam.

When the drive plate 28 is further driven, the lead-in latch 29 is reversed and disengages from the pin 24.
As shown in FIG. 15A, the protrusion 28c of the drive plate 28 presses the protrusion 33a of the index cam 33 and rotates the protrusion 33a to separate the roller 34 from the outer periphery of the record, so as not to have an adverse effect on the performance. do.

Next, as shown in FIG. B, the drive plate 28
Due to the action of the cam portion 28a, the elevation shaft 2
6 is lowered, the tone arm 5 is lowered onto the record, and the performance begins.

When the lowering of the tone arm is completed, limit switches S1 and S2 are activated as shown in FIG.
is turned off and the motor 22 stops.

() Tone arm return When the performance ends and the tone arm reaches the lead-out groove of the record, the motor 22 is started by a well-known performance end detection circuit, and the rack start gear 15 is activated.
rotates counterclockwise.

As a result, the crank 43 drives the drive plate 28 in the direction shown by the arrow in FIG. 16A, and the end of the drive plate pushes the pin 24 of the pickup plate 23, causing the tone arm 5 to rotate clockwise.

(V) 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 restricts its movement in the lateral direction by the linear part of the cam part 16a of the rack 16. Therefore, the pin 41b of the lock bar 41 cannot escape from the inclined portion of the guide cam 42, and only the rack 16 slides without moving the slide base 9.

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

() Repeat and Elevation If you want to repeat the performance, turn on the switch S7 of the operation section, and the performance will start again without pressing the start/stop switch S6 at the record changing position.

By adding a mechanism (for example, a photoelectric switch) to detect when the tone arm 5 has reached the storage position,
By reversing the rotation of the motor 22 and causing the tone arm to lead in, the time required for the repeat operation can be gradually shortened. 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 I Remove the record at the record replacement position and press start/stop switch S6.
Rack drive gear 15 rotates clockwise.

At this time, as described above, the record detection lever 36 has been reset as shown in FIGS. 9 and 11A, and as the slide base 9 moves, it moves to the state shown in FIG. The locking part 36b of the lever 36 is connected to the protrusion 4 of the lock bar 41.
1b to lock 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, the record detection lever 3
6 remains in the state shown in FIG. Instead, they move together and reach the storage position.

After the slide base 9 passes the performance position, the right end of the slide base 9 touches the cam portion 35 of the pick-up stopper 35.
a and rotates it to the position shown by the solid line in the figure, and its end engages with the pickup 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 rack teeth are appropriately selected, the motor 22 can be stopped as shown in FIG. 6B.
As shown in the chart above, control can be performed when both 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 installed and the record is not placed, the start/stop switch S
When 6 is pressed, the slide base 9 moves towards the back of the player cabinet, but since the record detection pin 40 is not lowered, the slide base 9 does not stop at the playing position and moves further into the back of the player cabinet. Move towards the direction.

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

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

As explained above, in the bookshelf type record player of the present invention, the index cam is reset by the crank immediately before the slide base stops at the record changing position, so that the reset operation can be performed reliably. It is possible.

[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. . 5...Tone arm, 9...Slide base,
15...Rack drive gear, 16...Rack, 23
...Pick-up plate, 23a... End of pick-up plate, 28... Drive plate, 30...
Resetter, 32... Drive pin, 33... Index cam, 43... Crank, 44... Turntable.

Claims (1)

[Claims] 1. (a) A slide base movably supported between a storage position, a performance position in front of the storage position, and a record changing position in front of the performance position, and (b) a slide. (c) A rack that is supported so as to be movable back and forth relative to the base, engages with the slide base as appropriate, and is driven by a rack drive gear; It has an index cam that controls the lead-in position and (d) a crank coupled to the rack drive gear, and the index cam is reset by the crank immediately before the slide base stops at the record changing position. Features a record player.