JPS58122666A - Front loading record player - Google Patents

Abstract

PURPOSE:To determine lead-in position accurately, by driving an index cam having an index pin and a step cam, and an assisting lever coupled in friction coaxially with a cam of a tone arm driving plate. CONSTITUTION:An index pin 54b and an assiting lever 53 frictionally copled with an index cam 54 having a step cam 54c restricting the rotating position of a tone arm coaxially are provided. A driving pin 53b of the lever 53 is driven with a channel shape cam 51c with the turning of a driving plate 51 horizontally turning the tone arm and the index pin 54b contacts an outer circumference R of a record disc. The index cam 54 is stopped, the lever 53 is turned further, and the driving pin 53b is out of the locus of the cam 51c. The plate 51 keeps turning and a contact piece 55b of the tone arm plate 55 contacts the step cam 54c of the index cam 54 and stopped. Thus, the lead-in is attained accurately in response to the disc size.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tone arm lead-in mechanism used in a front-loading record player, and its feature is that an index cam including an index pin and a stepped cam section is coaxially provided. By using a drive plate that frictionally engages the assist lever and rotates the tone arm horizontally, the assist lever is rotated to determine the lead-in position of the tone arm, making the mechanism extremely simple. It is a point.

Conventionally, in various fully automatic players, mechanisms have been known that mechanically detect the size of the record on the turntable and lead the tone arm into the lead-in groove. It is complicated and large, and it is difficult to use it as is in a front-loading record player, where all the mechanisms must be housed in a limited space on the slide base.

An object of the present invention is to obtain a tone arm lead-in mechanism that is simple and can be easily downsized.

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

FIGS. 1(a) and 1(b) are perspective views of the entire device, showing the slide space 1 in the storage position and the record disc loading/unloading position, respectively.

A front door 3 is provided at a position that covers the opening above the slide base on the front side of the player cabinet 2, and has a vertical position shown in the figure (a) and a horizontal position inside the player cabinet shown in the figure (b). supported so as to be movable between.

All the operation switches are gathered on the right side of the front of the player cabinet, and you can perform functions such as turning the power on/off, opening/closing the door, starting/stopping, manual playing, changing the rotation speed, and fine-tuning the speed.

FIG. 2 is a plan view showing the internal mechanism in the stored state.

A slide base 1 on which a turntable 4 and a tone arm 5 are mounted is supported so as to be movable in the front and rear directions relative to the player cabinet 2, and is moved to the storage position shown in FIG. 1(A) by a slide base drive mechanism. It moves between the record disc loading/unloading position shown in FIG.

The slide base drive mechanism includes a slide base drive motor 6 that is provided on the back side of the slide base 1 and rotates in both directions.
, a reduction gear, a pinion, and a rank 7 provided on the bottom plate of the player cabinet and meshing with the pinion.

The slide base drive motor 6 is started by operating a start/stop switch, and stopped by two limit switches SWI and SW2 provided along the movement locus of the slide base.

Positioning means 2 on the rear panel of the player cabinet 2
0 is provided, the slide base 1 moves to the storage position,
After the limit switch SW2 is turned off, it comes into contact with the rear end of the slide base to accurately regulate its stop position.

The output circuit of the limit switch SW2 is provided with a delay circuit (not shown), and power is supplied to the slide base drive motor 6 for a very short time (for example, about 0.1 seconds) even after the switch is turned off. It has become so.

As shown in the partially enlarged view, the positioning means 20 has the tip of a screw 20b provided on the board 20a as a contact surface, and the contact surface is inserted through a hole 20c provided in the rear panel (using a screwdriver). The position can be adjusted.

A circuit board 21 supporting a printed wiring board 21a provided with an electronic circuit for operation control is provided at a slight distance from the top plate of the player cabinet, and a slide base is installed at the rear right side of the circuit board 21, as shown in FIG. A slit 22 is formed along the moving direction.

Lead wires for extracting the pink-up output from the slide base 1, lead wires for various control signals, lead wires for power supplied to the slide pace drive motor 6, phono motor 40, and tone arm drive control motor 50 are connected to the tone arm. Gather from the rear position of 5 (without bundling)
It is pulled out upward and guided through the entire slit 22 formed in the circuit board 21 between the top plate and the circuit board.

These lead wires 23 are connected to the respective terminals of the printed wiring board connectors 21 and b after being given enough slack on the circuit board 21 so that they can easily follow the movement of the slide base. .

The tone arm 5 is driven and controlled by a drive plate 51 disposed coaxially below the tone arm 5, and is moved to a rest position provided at the rear of the turntable 4, as shown in FIG. 2, when not performing a performance. are doing.

Figure 4 is a plan view of the front door opening/closing drive part, in which (a) the slide base is in the storage position, (c) the record disc loading/unloading position, and (b) and (b) the intermediate positions. The front door is opened and closed by a guide cam 8 fixed to the bottom plate of the player cabinet 2 and integrally formed with the rack 7, and a drive cam 9 provided on the back surface of the slide base 1. The drive bin 10 is held in place and driven in the front and rear directions as the slide base moves.

The guide cam 8 is made up of a straight portion 8a and a recess 8b formed at its front end, and the driving force cam 9 is made up of a straight portion 8a and a recess 8b formed at the front end thereof.
a and a holding portion 9b formed obliquely at the front end thereof.

To explain its operation, when the slide base 1 is in the storage position shown in FIG. When the slide base moves forward, the front door opening/closing drive pin 10 is also driven forward.

When the front door opening/closing drive bin 10 is moved to the position shown in FIG. The slide base moves to the right, pulls out from the holding part 9b, and falls into the recess 8b, and then the slide base is removed from the same figure (c).
Even when the front door opening/closing drive bin 10 is moved to the record disc loading/unloading position shown in FIG.

When the slide base moves backward this time and reaches the position shown in ), the front door opening/closing drive bin 10 is moved to the holding part 9.
It moves to the left along the inclined surface of b, pulls out from the recess 8b, engages the holding part 9b again, and is driven rearward as the slide base moves and reaches the storage position shown in FIG. Ru.

FIG. 5 is a left side view showing the interlocking mechanism between the front door opening/closing drive bin 10 and the front door 3, in which a sliding rod 11 and a slide lever 12 are installed along the left side wall of the player cabinet (as viewed from the front). is supported so as to be movable in the front and rear direction, and gear 1
3, they are interlocked in opposite directions.

A front door opening/closing drive bin 10 is fixed to the tip of a lever 11a that is supported horizontally at the front end of a sliding rod 11 so as to be swingable.

An upper guide pin 3a and a lower guide pin 3b are provided on both sides of the front door 30, and the front end of the slide lever 12 is pivotally supported by the upper guide pin 3a on the left side (as viewed from the front).
As shown from (a) to (b) in the figure, when the front door open/close drive bin 10 is driven forward, the front door 3 opens, and conversely, when it is driven backward, it closes.

If the gear 13 is composed of two large and small gears coaxially connected as shown in FIG. If the connection is made through a safety joint such as a friction joint with a locking protrusion and a recess, even if the front door does not move due to being held down with all hands, the drive mechanism and interlocking mechanism can be easily operated. There is no risk of malfunction.

One end of the wire 14 is fixed in the middle of the slide lever 12, and the other end is connected to the front door 3 via two fixed pulleys provided on the left and right sides of the top plate of the player cabinet, as shown in FIG. It is fixed to the upper guide bin 3a on the right side (as viewed from the front).

Because of this design, when the front door opens (i.e., when moving from a vertical position covering the front of the player cabinet to a horizontal position inside the player cabinet), the long and narrow front door moves from side to side in unison without twisting. do.

Figures 7 and 8 show the guide grooves that support the upper and lower guide pins of the front door, and Figure 7 shows the guide grooves provided on (the inside of) the left side wall from the outside. Moreover, FIG. 8 is a view of the guide grooves provided on (the inside of) the right side wall, respectively, viewed from the inside.

Each guide groove 16 consists of a horizontal portion 16a and an inclined portion 16b that branches downward from the middle and extends forward, and a plate spring 16c for direction control is provided covering the upper end of the inclined portion.

To explain its operation, when the front door 3 is in the closed position (vertical position), the upper guide bin 3a is placed at the front end of the horizontal portion 16a, and the lower guide pin 3b are respectively engaged with the front ends of the inclined portions 16b.

The slide lever 12 moves backward and the upper guide bin 3a
When moved backward, as shown in the same figure (b),
The upper and lower guide pins 3a and 3b each have a horizontal portion 1
6a and the inclined portion 16b, and the front door 3 rises while rotating rearward to the open position (c) of the same figure.
(horizontal position).

At this time, the leaf spring 16c is pushed up by the lower guide pin 3b, and when the slide lever 12 moves forward to move the front door 3f to the closed position, the lower guide bin 3b is pushed up by the leaf spring 3c. It is guided to the inclined portion 16b.

When the lower guide pin 3b passes the branch point, the leaf spring 16c moves downward to the inclined portion 16b, as shown in FIG.
Then, when the upper guide bin 3a reaches a branch point, it is guided forward along the horizontal portion 16a.

As shown in FIG. 8, the guide groove 16 provided on the right side wall has a slightly longer rear end of a horizontal portion 16a, and a spring 16d is provided in this portion, as shown in FIG. When the front door 3 is in the closed position, the upper guide pin 3a contacts the spring 16d and is biased forward.The upper guide pin 3a on the right side of the front door is pushed backward only when opened by the wire 14. The spring 16 is designed to be pulled and no force is applied when it starts to close.
By pushing the upper guide pin 3a forward by the biasing force d, the movement of the right end of the front door is prevented from being delayed.

The front door is pushed out a little and the lower guide pin 3b moves to the inclined part 1.
6b, the weight of the front door generates a force in the closing direction, so the biasing force of the spring 16d only needs to act over a short distance.

FIG. 9 shows another embodiment of the direction control member, in which the leaf spring 1
6c, a plate-like member 16e is supported in front of the branch point so as to be swingable in the vertical direction, and its own weight causes the inclined portion 16b to
It covers the top edge of the .

FIGS. 10 and 11 show other embodiments of the front door support structure, in which there is no need to provide a direction control member in the guide groove.

The one shown in FIG. 10 is the lower guide pin 31b of the front door.
The diameter of the upper guide pin 31. Make a small cut from the diameter of a, and adjust the width of the inclined portion 161b of the guide groove to the upper guide pin 3.
By making the diameter smaller than the diameter of the upper guide pin 161a, as shown in FIG.
It was designed so that it would not be needed.

When the front door 3 is driven forward from the closed position shown in FIG. The pin 31a continues to move forward along the straight line portion 161a until it reaches the position shown in FIG.

In the case shown in FIG. 11, the length of the lower guide pin 32b is set to the upper guide pin 3, as seen in the horizontal sectional view on the right side.
The inclined portion 16 of the guide groove is shorter than that of the guide groove 2a.
By making the depth of the upper guide pin 2b shallower than the length of the upper guide pin 32a, the upper guide pin 32a is prevented from entering the inclined portion 162b, and its operation is similar to that shown in Fig. 1θ. .

$12 Figure 14 is a plan view of the tone arm drive control mechanism, in which (a) the tone arm 5 is in the rest position, (b) is above the introduction groove of a 30 cm diameter record, and (/
-1 shows the state that each exists on the introduction groove.

A drive plate 51 provided on the bottom plate of the slide base is connected to a tone arm drive control motor 50 (second
(see figure) via a speed reduction mechanism, and an operation cam 51a formed on the outer edge operates limit switches SW3 to SW5 arranged around the drive plate 51.

On the top surface of the drive plate 51, an arc-shaped tone arm elevating cam 51b1 consisting of a flat part and an inclined part, a U-shaped drive cam 5], c, and a convex part 51d are provided respectively, and are held together by a click spring 51e. A lead-in latch 51f held at the position shown in the figure is rotatably supported, and an arcuate hole 51h is formed on the lower surface of the tip of the lead-in latch 51f, through which a protruding bottle 51g is loosely inserted.

An arm lifter 52 (see FIG. 2) is mounted on a shaft 52a on the top plate of the slide base over the rotation range of the tone arm 5.
The lower end of the shaft 52a is in contact with the tone arm elevating cam 51b of the drive plate.

An assist lever 53 and an index cam 54 are rotatably supported coaxially on the top plate of the slide base, and are frictionally engaged with each other. It freely penetrates the hole 53a.

A drive cam 51 of a drive plate is provided on the lower surface of the assist lever 53.
A drive pin 53b that abuts the drive pin 53b and a release pin 53c that abuts the release lever protrude.

An index pin 54b is protruded from the top surface of the index cam 54 and comes into contact with the outer periphery of the record R (of 30 cm diameter) placed on the turntable 4, and an index pin 54b which comes into contact with the tone arm plate 55 is provided on the outer edge of the index pin 54b. A stepped cam portion 54c is formed to regulate the rotational position.

A reset spring 56 is provided on the top plate of the slide base, and comes into contact with the index cam 54 when it rotates counterclockwise in the 8 [direction] to regulate its rotational position.

A dog-shaped release lever 57 is rotatably supported on the top plate of the slide base, a pin 57a provided at one end contacts a drive cam 51c of a drive plate and rotates, and the other end 57b is an assist lever release lever. The assist lever 53 is rotated by contacting the pin 53c.

A tone arm drive pin 55a is protruded from the lower surface of the tone arm plate 55 fixed to the horizontal rotation axis of the tone arm 5, and when the drive plate 51 rotates counterclockwise, the protrusion 51d and the lead-in latch 51f are connected to the tone arm drive pin 55a. The drive plate 5 is sandwiched between
When the drive plate 51 rotates clockwise, it is pushed by the protruding portion 51d and rotates together with the drive plate 51 (lead-out).

At the tip of the tone arm plate 55, a contact piece 55b that comes into contact with the stepped cam portion 54c of the index cam and a detection piece 55c that optically detects that the tone arm has entered the lead-out groove of the record are provided. ing.

A projection piece 58 is provided on the bottom plate of the slide base, and the driving plate 5
When the lead-in latch 1 rotates to the position shown in the figure (A), it comes into contact with a pin 51g protruding from the lower surface of the lead-in latch 51f, thereby returning the lead-in launch to the position shown in the figure.

Figure 13 shows the assist lever 53 and the index cam 5.
12 and 1.
The operation of the tone arm drive mechanism will be explained with reference to FIG.

In the state shown in FIG. 12(a), the tone arm 5
is in the rest position, the tone arm drive pin 55a of the tone arm plate 55 is held between the convex part 51d of the drive plate and the lead-in latch 51f, and the shaft 52a of the arm lifter is in the flat part of the tone arm lifting cam 51b. is in contact with.

Now, when the tone arm drive control motor 50 is started using the start/stop switch provided on the front of the player cabinet, the drive plate 51 rotates in the counter-clockwise direction, and the drive cam 51c engages the drive pin of the assist lever 53. 53b to rotate the assist lever 53 and the index cam frictionally engaged therewith clockwise.

At this time, if a record R with a diameter of 30 cm is placed on the turntable, as shown in Figure 13 (b),
The index pin 54b comes into contact with the outer periphery of the index cam 54, and the index cam 54 stops, as shown in FIG.
Only the assist lever 53 rotates further, and the drive pin 53b deviates from the trajectory of the drive cam 51c and stops.

During this time, the release lever 57 rotates counterclockwise by contacting the release pin 53c of the assist lever, and the pin 57a provided at one end of the release lever 57 enters within the locus of the drive cam 51c.

When the drive plate 51 further rotates and the tone arm 5 rotates to a position above the introduction groove of the record R, the tone arm plate 550 abutting piece 55b moves against the index cam 54 as shown in FIG. (If the record is a 25 cm diameter record, the index cam rotates more clockwise and the contact piece 55b comes into contact with the large diameter part of the stepped cam part 54c.) (contact).

When the drive plate 51 rotates further, the state shown in FIG. 14C)→(B)
As shown in , the lead-in latch 51f is pushed by the tone arm drive pin 55a and rotates clockwise to release the tone arm drive pin 55a, and the tone arm 5 becomes free.

Next, the drive cam 51c rotates the IJ 11-sleeper 57 clockwise, and the end 57b of the release lever 57
comes into contact with the release bin 53c of the assist lever, rotates the assist lever and the index cam counterclockwise, and separates them from the outer periphery of the indunk pin 54bi record.

The drive plate 51 further rotates, and the arm lifter shaft 52a
12(
At the position shown in c), the operating cam 51a operates the limit switch SW5, and the drive plate 51 stops.

At the same time, a mute switch (not shown) provided near the limit switch SW5 is turned off, and the performance begins.

As the performance progresses and the tone arm 5 reaches the lead-out groove of the record IIH, a detection piece 55c provided on the tone arm plate 55 cooperates with a well-known end detection mechanism (not shown) to generate a performance end signal. Then, the drive plate 51 is rotated clockwise in the opposite direction.

When the drive plate 51 rotates clockwise, the arm lifter shaft 52a first moves up along the slope of the tone arm elevating cam 51b, and then the protrusion 51d moves against the tone arm drive pin 55aK.

Touch the tone arm (plate) f and rotate it clockwise.

Further, as shown in FIG. 13(e), the drive cam 51
c comes into contact with the drive pin of the assist lever 53 and rotates the assist lever and index cam clockwise.

The index cam 54 comes into contact with the reset spring 56 and its rotation is restricted, and the engagement pin 54a is shifted and aligned to the position where it comes into contact with the end of the elongated hole 53a of the assist lever, and the drive plate 51 further rotates. When the drive cam 51c is removed from the drive pin 53b, the reset spring 56 returns it to the reset position, as shown in FIG.

When the drive plate 51 further rotates to the position shown in FIG. 12(A), the pin 51g of the lead-in latch 51f comes into contact with the protrusion 58 provided on the bottom plate of the slide base and rotates counterclockwise. After rotating in the direction and clamping the tone arm drive pin 55a'f again, the end of the operating cam 51a operates the limit switch 5W3t, and the drive plate 51 stops.

What is shown in FIG. 15 is another embodiment of the means for aligning the assist lever and the index cam, and the difference from the above-mentioned one is that the stopper 59 on which the index cam 54 abuts against the top plate of the slide base. and reset spring 561e (not index cam)
This is the point where the assist lever 53 is brought into contact.

When the drive plate 51 rotates clockwise and the drive cam 51c rotates the assist lever 53 against the reset spring 561 to the position shown in FIG. When the drive plate rotates further and the drive pin 53b comes off the drive cam 51c as shown in FIG. The reset spring 561 returns it to the reset position.

Finally, the overall related operations will be explained.

When the open/close switch is pressed in the stored state shown in Figure 1 (A), the slide base 1 begins to move forward, the front door 3 immediately opens, and the slide base opens as shown in Figure 1 (A).
Move to the record loading/unloading position shown in b) and stop.

Place the record on turntable 4 and start/
When the stop switch is pressed, the slide base 1 moves to the storage position, the front door 3 closes, automatic performance begins, and after the performance is finished (the next step is to stop) the tone arm returns to the rest position. Stop. So it opens again/
When you press the close switch, the slide base moves to the record loading/unloading position and stops.

When you remove the record and press the open/close switch, the slide base moves to the storage position and the front door closes.

To play manually, place the record on the turntable in the record loading/unloading position, press the manual play switch, the slide base remains stationary, and the tone arm comes forward and inserts into the lead-in groove. (The drive plate 51 is stopped at the position where the operating cam 51a operates the limit switch SW4')H).

Then, by manually determining the lowering position of the pickup and pressing the elevation switch, the tone arm lowers to the desired position, and when the performance is finished, the tone arm moves to the rest position.

If you press the elevation switch during a performance, the tone arm will rise and stop at that position.

To perform repeat play, turn on the repeat play switch in the record loading/unloading position, press the start/stop switch, the slide base will move to the storage position, and press the repeat play switch again to cancel repeat play. Repeat play until the

As explained above, the lead-in mechanism of the tone arm of the present invention has a driving force for horizontally rotating the tone arm by frictionally engaging an index cam including an index focus stage cam section with an assist lever provided coaxially with the index cam. By using a plate to rotate the assist lever to determine the lead-in position of the tone arm, the mechanism can be made extremely simple, allowing it to be used within the limited space on the slide base of a front-loading record player. It can also be easily stored.

Nao, in the above embodiment, a front-loading record player was described, but the tone arm lead-in mechanism of the present invention can also be used for a type of record player that does not normally move the turret. Needless to say, it is possible.

[Brief explanation of the drawing]

Fig. 1: A perspective view of an embodiment of the invention Fig. 2: A plan view showing the internal mechanism in the stored state Fig. 3: A plan view of the circuit board Fig. 4: Front Plan view of the door opening/closing drive mechanism Fig. 5... Left side view of the interlocking mechanism between the front door opening/closing drive pin and the front door Fig. 6... Plan view showing the interlocking mechanism between the slide lever and the front door Fig. 7 ...Side view of the guide groove provided on the left side wall FIG. 8...Side view of the guide groove provided on the right side wall FIG. 9...Side view of another embodiment of the direction control member FIG. 10
Figure 11: Side view and horizontal sectional view of yet another embodiment of the guide groove. Figure 12: Plane view of the tone arm drive control mechanism.
Figure 3: Plan view showing the related operation of the assist lever and index cam. Figure 14: Plan view showing the operation of the lead-in latch. Figure 15: Other means for aligning the assist lever and index cam. Plan view of the embodiment 1...Slide base 2...Player cabinet 3...Front door 3a...Upper guide pin 3b
...Lower guide pin 4...Turntable 5...Tone arm 6.
...Slide pace 7...Rack drive motor 8...Guide cam 8a-...Straight line portion 8b...
・Recessed portion 9... Drive cam 9a... Straight portion 9b...
・Holding part 10...Front door opening/closing drive pin 11...Sliding rod 11a...Lever 12・
...Slide lever 13...Gear 14...Wire 16...Guide groove 16a, 161ζ162a...
・Horizontal portions 16b, 161b, 162b... Slanted portion 16c... Leaf spring 16d... Spring 16e... Plate member 20... Positioning means 20a... Board 20b.
... Screw 20c... Hole 21... Circuit board 21a... Printed wiring board 21b... Printed wiring board connector 22... Slit 23... Lead wire 31
32a... Upper guide bin 31 32b... Lower guide bin 40... Phono motor 50... Tone arm drive control motor 51... Drive plate 51a... Operation cam 51
b... Tone arm lift 51c... (U-shaped) driving/lowering cam Moving cam 51d... Convex portion 51e... Click spring 51f... Lead-in run 51g... Pinch
51h...Circular hole 52...Arm lifter 52a...Shaft 53...Assist lever 53a...
... Elongated hole 53b... Drive bin 53c... Release bin 54... Index force 54a... Engagement bin 54b... Index screw 54c... Step cam part 55... Tone arm 55a... Tone Arm drive rate Moving pin 55b...Abutment piece 55c...Detection piece 56
．． 561...Reset spring 57...Release lever 57a...Bin 57b...End portion 58...Protrusion piece 59...Stopper agent Patent attorney Makoto Oka - (A) (B) 8b 8b 4 Figure (c) (d) 7m (b), tb (l\) 6C Fig. 8 (b) Fig. 9 (b) b (l\) Fig. 10 (b) (c) Fig. 12 Fig. 12 (B) Figure 12) Continued from page 1 0 Inventor Toshifumi Sakurai Inside Tokorozawa Plant, Pioneer Co., Ltd. 4-2610 Hanazono, Tokorozawa City

Claims (1)

[Claims] An index cam, which includes an index pin that contacts the outer periphery of a record placed on a turntable and a stepped cam portion that regulates the rotational position of the tone arm, is frictionally engaged with an assist lever provided coaxially with the index cam. A tone arm lead-in mechanism 0 characterized in that the lead-in position of the tone arm is determined by rotating an assist l/bar by a drive plate that rotates the horizontal rotation axis of the tone arm.