JPS58122646A - Front loading record player - Google Patents

Abstract

PURPOSE:To perform positioning accurately, by actuating a slide base driving motor for a short time further, after a slide base of a record player is stored in a containment position and a limit switch is operated. CONSTITUTION:The slide base 1 loading a turntable 4 of the record player is forwarded/retrogressed with deceleration from a motor 6 rotated in both directions provided at the back side of the base 1. When the slide base 1 comes to the storing position, a positioning means 20 provided at the rear panel of a cabinet 2 contacts the rear end of the slide base 1. An output circuit of a limit switch 2 is provided with a delay circuit (not shown) and the motor 6 is driven for a short time, e.g. about 0.1sec even after the switch is turned off. Thus, the position of the slide base 1 is accurately determined.

Description

[Detailed Description of the Invention] This invention relates to stop position control of a slide pace in a front-loading record player, and its feature is that when the slide pace is moved from a record loading/unloading position to a storing position. After the limit switch is operated, the slide pace is driven by the slide pace drive motor for a short period of time, and then stops when it comes into contact with the positioning means, making positioning in the storage position extremely accurate. This is something that can be done.

Conventionally, in order to reduce the space occupied by the player cabinet (especially the space above it) and to make it possible to stack other stereo equipment on top of it if necessary, a slide base on which a turntable was mounted was used to mount the player cabinet. A device is known that is supported so as to be movable in the front and back direction with respect to the cabinet, and the slide base is moved forward from the storage position when in use.

In such devices, the stop position of the slide base is usually determined using a limit switch.
Due to variations in the position of the switch itself and its mounting, it is difficult to accurately control the stop position, especially for switches designed so that the front of the slide base is flush with the front of the player cabinet when stored. In this case, even a slight deviation was unsightly and seriously detracted from the sense of luxury.

An object of the present invention is to extremely accurately control the stop position of the slide base in its storage position.

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

FIGS. 1A and 1B are perspective views of the entire structure, showing the slide base 1 in the storage position and the record disc mounting/removal 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 placed 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. Move between the record loading and unloading positions shown in (b).

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 the start/straft 2 inches, 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 stopping 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. As shown in the partially enlarged view, the positioning means 20 has the tip of a screw 20b provided on the board 20a as an abutting surface, and is inserted through a hole 20c provided on the rear panel (driver). ) can adjust the position of the contact surface.

A circuit board 21 supporting a printed wiring board 21a'+i on which an electronic circuit for operation control is provided is provided at a slight distance from the top plate of the player cabinet, and as shown in FIG. A slit 22 is formed along the direction of movement of the base.

Lead wires for extracting pickup output from the slide base 1, lead wires for various control signals, power lead wires for supplying power to the slide base drive motor 6, phono motor 40, and tone arm drive control motor 50 are connected to the tone arm 5. from the rear position (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 respective terminals of the printed wiring board connector 21b after being slackened enough 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 on the lower side of the tone arm 5, and when not playing, is in a rest position provided at the rear of the turntable 4, as shown in FIG. It's moving.

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. This shows the status of each.

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 operate the front door opening/closing drive bin 1.
0 is held and i' is driven backwards as the slide base moves.

The guide cam 8 consists of a straight section 8a and a recess 8b formed at its front end, and the drive cam 9 consists of a straight section 8a and a recess 8b formed at its front end.
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 bin 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 with the holding part 9b again, and is driven rearward with the movement of the slide base to the storage position shown in the figure (a). Arrive.

FIG. 5 is a left side view showing the interlocking mechanism between the front door opening/closing drive bin IO 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 bin 3a and a lower guide bin 3b are provided on both sides of the front door 3, and the front end of the slide lever 12 is pivotally supported by the upper guide bin 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 front door is connected via a safety shaft joint such as a friction joint that has an engaging protrusion and a recess, even if the front door does not move due to being held down with all your hands, the drive mechanism and interlocking mechanism will remain intact. There is no risk of it breaking down.

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. (Viewed from the front) Upper right side upper guide/
It is fixed at 3a.

Because of this, when the front door opens (i.e., moves from a vertical position covering the front of the player cabinet to a horizontal position inside the player cabinet), the elongated front door does not twist from side to side, but moves in unison. 0 Figures 7 and 8 show the guide grooves that support the upper and lower guide bins of the front door.
From the outside, the guide groove provided on the inside of the eighth
The figures show the guide grooves provided on (the inside of) the right side wall, viewed from inside.

Each guide groove 16 consists of a horizontal portion 16a and an inclined portion 15b 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 located at the front end of the horizontal portion 16a, and the lower guide bin 3a is 3b are respectively engaged with the front ends of the inclined portions 16b.

The slide lever 12 moves backward and the upper guide pin 3a
When moved backward, as shown in the same figure (b),
The upper and lower guide bins 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.
water/F position).

At this time, the plate spring 16c is pushed up by the lower guide pin 3b, and when the slide lever 12 moves forward to move the front door 3 to the closed position, the lower guide pin 3b is pushed up by the plate spring. 3c and 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 pin 3a reaches the 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 pressed only when the wire 14 is used to open the upper guide pin 3a. The spring 16 is pulled backwards and no biasing 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 member 16e is supported in front of the branch point so as to be able to swing vertically, 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 31a is smaller than the diameter of the upper guide pin 31a, and the width of the inclined portion 161b of the guide groove is made smaller than the diameter of the upper guide pin 31a.
By making the diameter smaller than the diameter of a, the upper guide pin 31a is prevented from entering the inclined portion 161b, as shown in FIG.

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 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. be.

FIG. 12 is a plan view of the tone arm drive control mechanism, in which (a) the tone arm 5 is in the rest position, and (b) the tone arm 5 is in the rest position.
Above the introduction groove of a record with a diameter of 0 cm, (c)
1 and 2 show the respective states 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), the limit switches SW3 to SW5 arranged around the drive plate 51 are operated by an operation cam 51a formed on the outer edge.

On the upper surface of the drive plate 51, an arc-shaped tone arm elevating cam 51b consisting of a flat part and an inclined part, a U-shaped drive cam 51c, and a protruding part 51d are protruded from the upper surface of the drive plate 51. A lead-in latch 51f held in position is rotatably supported, and a pin 5 protrudes from the lower surface of the tip of the lead-in latch 51f.
An arcuate hole 51"h through which a diameter of 1g freely passes is formed.

An arm lifter 52 (see diagram #A2) is mounted on the shaft 5 over the rotation range of the tone arm 5 on the top plate of the slide base.
The lower end of the shaft 52a is in contact with a tone arm elevating cam 51b of a 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. The drive cam 51 of the drive plate is provided on the lower surface of the O assist lever 53 loosely penetrating the hole 53a.
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 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 convex portion 51d and rotates together with the drive plate 51 (lead-out) O 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.

A projecting piece 58 is provided on the bottom plate of the slide base, and the drive plate 5
When the lead-in latch 1 rotates to the position shown in the figure (A), the lead-in latch comes into contact with the pin 51gKM protruding from the lower surface of the door inlet 51f, returning the lead-in latch to the position shown in the figure.

Figure 13 shows the assist lever 53 and the index cam 5.
Figure 12 shows the operation related to Figure 4.
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 portion 51d of the drive plate and the lead-in latch 51f, and the shaft 52a of the arm lifter is connected to the tone arm lifting cam 5'lb. It is in contact with the flat part of.

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 counterclockwise, and the drive cam 51c moves into the drive bin 53b of the assist lever 53. The assist lever 53 and the index cam frictionally engaged therewith are rotated 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 bin 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 bin 53b deviates from the trajectory of the drive cam 51c and stops.

During this time, the +71 earth lever 57 rotates counterclockwise by contacting the release bin 53c of the assist lever, and the bin 57a provided at one end thereof enters within the locus of the drive cam 51c.

When the driving plate 51 further rotates and the tone arm 5 rotates to a position above the introduction groove of the record R, the abutment piece 55b of the tone arm plate 550 is moved to the index position as shown in FIG. 12(b). The cam 54 comes into contact with the small diameter part of the stepped cam part 54c and stops (for a record with a diameter of 25 cm, 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). ).

When the drive plate 51 further rotates, 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, as shown in FIGS. 'ii Release, tone arm 5 becomes free.

Next, the drive cam 51c rotates the release lever 57 clockwise, and the end 57b of the release lever 57 contacts the release bin 53c of the assist lever to rotate the assist lever and index cam counterclockwise.
The index bin 54b'e is separated from the outer periphery of the record 0 The drive plate 51 rotates further 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 R, a detection piece 55c provided on the tone arm plate 55 cooperates with a well-known end detection mechanism (not shown) to issue a performance end signal. This causes the drive plate 51 to rotate clockwise in the opposite direction from the front.

When the drive plate 51 rotates clockwise, the shaft 52a of the arm lifter rises along the slope of the tone arm elevating cam 51b, and then the convex portion 51d abuts against the tone arm drive bin 55a to raise the tone. Rotate the arm (plate) fully clockwise.

In addition, as shown in FIG. 13, the drive cam 51c
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 bin 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 bin 55a again, the end of the operating cam 51a operates the limit switch SW3, 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 index cam 54 comes into contact with the top plate of the slide pace. A stopper 59 is provided,
The O drive plate 5 is the point where the reset spring 561 comes into contact with the assist lever 53 (not the index cam)
1 rotates clockwise and the drive cam 51c rotates the assist lever 53 against the reset spring 561 to the position shown in FIG.
4 is in contact with the stop horns -59 and its rotation is restricted and is aligned with the assist lever (-53), and the drive plate further rotates as shown in FIG.
c, the assist leno (-53) and the index cam 54 are returned to the reset position by the reset spring 561.

Finally, the overall related operations are explained in Figure 1 (a).
When the open/close switch is pressed in the storage state shown in the figure, the slide pace 1 begins to move forward, the front door 3 immediately opens, and the slide base opens the record recorder as shown in the figure (b). Move to the position and stop.

Place the record on turntable 4 and start/
When the stop switch is pressed, the slide pace 1 is moved to the storage position, the front door 3 is closed, automatic performance is performed, and after the performance (or by a stop operation) the tone arm returns to the rest position and stops. Then, if the open/close switch is fully engaged again, the slide pace will move to the record loading/unloading position and stop.

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 operation cam 51a is operated by the Mitsubishi Inch SWJ).

Then, I manually set the pickup's lowering position, press the elevation switch, and the tone arm lowers to the desired position. 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 pace will move to the storage position, and then press the repeat play switch again to release the repeat performance charge. Repeat play until the

As explained above, in the front loading record player of the present invention, when the slide pace is moved to the storage position, the slide base is driven by the slide pace drive motor for a short period of time after the limit switch is operated. By making the stopper come into contact with the positioning means, the stop position can be controlled extremely accurately.

[Brief explanation of drawings]

Figure 1: A perspective view of an embodiment of the invention Figure 2: A plan view showing the internal mechanism in the stored state Figure 3: A plan view of the circuit board Figure 4: Front door Plan view of the 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: Side view of another embodiment of the guide groove Figure 11...
Side view and horizontal sectional view of still another embodiment of the guide groove FIG. 12 . . . Plan view of the tone arm drive control mechanism 1st
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: Means for aligning the assist lever and index cam. Plan view of other embodiments 1...Slide pace 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, 161a, 162a
... Horizontal portion 16 legs 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
FK32a... Upper guide pin 31 32b... Lower guide pin 40... Phono motor 50... Tone arm drive control motor 51... Drive plate 51a... Operation cam 51
b...Tone arm lift 51c...(U-shaped) driving gum Moving cam 51d...Protrusion 51e...Click spring 51f...Lead inlet 51g...Pinch
51h...Circular hole 52...Arm lifter 52a...Shaft 53...
Assist lever 53a...Long hole 53b...Drive pin 53c...Release pin 54...Index cam 54a...Engagement pin 54b...Index pin 54c...Step cam portion 55... Tone arm 7' 55a...Tone arm drive rate
Moving pin 55b...Abutment piece 55c...Detection piece 56
．． 561...Reset spring 57...Release release <-57a...Pin 57b...End portion 58...Protrusion piece 59...Stotsunoku-
Agent Patent Attorney Makoto Oka (A) (B) Figure 4 (/\) (D) Figure 7 (B) b (l\) 6C Figure 8 (B) Figure 9 (B) b (l\) ) (B) (C) Figure 12 (A) Figure 12 (B) Figure 14 (A) (B) Continued from page 1 0 Inventor Toshifumi Sakurai 4-2610 Hanazono, Tokorozawa City Pioneer Co., Ltd. Tokorozawa in the factory

Claims (2)

[Claims] (1) (a) A slide pace on which the turntable is placed and driven by the slide base drive motor to move between the storage position and a record loading/unloading position in front of the storage position; (b) in the storage position (c) a limit switch that is operated by the slide pace when the slide pace approaches the storage position; and (2) a limit switch that controls the drive of the slide base drive motor and delays the output of the limit switch. When the slide pace is moved to the storage position, the slide pace is driven by the slide pace drive motor for a short period of time after the limit switch is operated, and the slide pace is moved and positioned. A front-loading record player characterized in that the record player stops when it comes into contact with a means. (2) A front-loading record player according to claim 1, wherein the positioning means is supported by a screw so that its position can be adjusted in the front-rear direction.