JPH0150001B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simple phonograph, and more particularly to a simple phonograph in which a pick-up sequentially selects and anastomoses a plurality of recording grooves on a record to sequentially reproduce the recorded contents.

2. Description of the Related Art Conventionally, a device has been provided which selects and reproduces a recording groove of a record disc having a plurality of recording grooves.

However, this conventional device selects recording grooves purely mechanically, and its structure is extremely complicated, causing problems in smoothness and reliability of operation. Also, the playback of the selected recording will ensure that the playback of the recording content ends and the operation stops.
Devices that can play back each recording in sequence are still not available.

However, recently, the toy industry has suddenly started to develop products that are extremely simple in structure and reliable in operation.
There has been a demand for the development of a simple gramophone that is smooth and capable of selecting the playback and sequentially playing back each recorded content.

The present invention addresses this problem with simple phonographs, and its purpose is to provide a simple phonograph that can sequentially reproduce each recorded content.

That is, the present invention, as in the illustrated embodiment, includes a record disc 3 which is rotatably supported in a casing 1 by a motor M and has a plurality of recording grooves 2 and 2a, and a It has a pick-up 6 that moves from the playback start point 4 to the playback end point 5 along the same line, and is always supported by a first return spring 7.
a tone arm 8 configured to bias the pickup 6 toward a playback starting point; and a speaker 2.
3 and a sound conductor 22, and installed so that the pickup 6 slides into contact with the speaker unit.
SP, a stylus pressure spring 24 that pushes the sound conductor 22 toward the record 3, and a stylus pressure spring 24 that can be pushed by the tone arm 8 to swing when the tone arm 8 reaches the playback end point 5; The turn arm 13 is arranged and pivotally mounted so as to be able to swing in a direction away from the tone arm 3, and this turn arm 13 is pushed by the tone arm 8, swings and rides on the sound carrier 22 of the speaker unit SP. An upward cam 20 is provided at the center of the record disc 3 and rotates together with the record disc 3 so as to be able to lift the record disc 3; a first switch 16 for turning on and off the motor M; and the tone arm 8. A second switch 31 is disposed at the returned position, and the tone arm 8 returns to push the movable contact 31a, and is separated from the fixed contact 31b to open the movable contact 31a. 4a
In a simple phonograph for reproducing a plurality of recording grooves, which can be positioned in accordance with The concave surface 20b that enters, and the concave surface 20b
The turn arm 8 inserted into the upward cam 2
The riding surface 20c of the turn arm 8 is moved upward by the rotation of 0, and the sound conductor 22
a protrusion 20d that lifts up the protrusion 20d; and a descending surface 20a that lowers the turn arm 13 that has climbed onto the protrusion 20d by rotation of the upward cam 20.
, and the upward cam 20 includes the concave surface 20b, the riding surface 20, the protrusion 20d, and the descending surface 20a corresponding to the number of recording grooves, and each of the concave surfaces 20b corresponds to the number of the recording grooves. Each of the descending surfaces 20a is provided at a position corresponding to the playback end point of each of the recording grooves, and each of the descending surfaces 20a is provided ahead of the playback start point by a rotation angle corresponding to the playback start point of each of the recording grooves. , the pickup 6 moves from the playback start point to the playback end point of the recording groove,
When the phonograph returns to the playback starting point, a recording groove other than the selected recording groove is selected and the other recording grooves are sequentially reproduced. Related to structure.

Embodiment A typical embodiment will be described with reference to the drawings. That is, FIG. 1 is a plan view of the casing 1 with the housing removed. So what you see here is the palm part of the casing. 11 in the figure is a battery magazine, on which a variable resistor 12 constituting an electric circuit is attached. An electric motor M is fixed on the side end of the casing 1 opposite to the portion where the battery magazine 11 is provided. On the surface plate 1' of the casing 1 between the position where the battery magazine 11 is provided and the position where the motor M is provided, a tone arm 8 and a turn arm 13 for returning the tone arm are mounted on pins, respectively. 14,
15.

As shown in detail in Fig. 2, the record 3 is
A turntable 18 is mounted and fixed on the back surface of the chassis of the casing 1, which is pivotally connected to a center pin 17 that is erected toward the inside. The turntable 18 has a pulley on its circumferential surface. A belt 19 made of an elastic member is stretched between the output shaft MS of the motor and the turntable 18.

As is clear from FIGS. 1 and 2, at the center of the turntable 18 there is a boss 18' provided for fixing the record 3, and at the center there is a boss 18' for returning the tone arm. upward cam 2
0 is fixed. The configuration of this upward cam 20 is such that it cooperates with the turn arm 13 to
The stylus pressure needle 26 when applying stylus pressure to the playback needle 26 of the pick-up 6 after returning to the playback starting point.
This is important for setting the timing for lowering the recorder onto the record 3. That is, if the reproduction needle 26 temporarily selects and reproduces a specific recording groove 2, and the pickup 6 reaches the end point of reproduction, the pickup 6 pushes the turn arm 13 onto the upward cam 20 so that it rides on it. Since the upward cam 20 is rotating together with the record 3, it scoops up the turn arm 13 and moves it upward. Then, the turn arm 13 lifts up the sound carrier 22 of the speaker unit SP from below and moves it away from the recording surface of the record disc 3, thereby releasing the stylus pressure of the reproduction stylus 26. As a result, the tone arm 8 and pickup 6 return to the playback starting point 4a. As shown in FIG. 3, the descending surface 20a formed at the rear in the rotational direction of the upward cam 20 (see the arrow in the figure) extends from a rotational angle of 100 degrees to 70 degrees with respect to the playback start point 4a of another recording groove 2a. By arranging the regenerated needle 2
6 descends to the recording surface of the record 3 at a good timing and selects a recording groove 2a different from the recording groove 2.
The needle pressure spring 24 has a plate shape and is fixed to a mounting portion 24a formed on the face plate 1' of the casing 1 with a screw 24b. The tip of the needle pressure spring 24 biases the portion of the speaker unit SP that is not supported by the support column 21. A wide passage 25 is provided in the face plate 1 along the trajectory along which the pickup 6 of the tone arm 8 described above rotates.
The record 3 has a round opening near its center, and the aforementioned cam 20 faces onto the face plate 1 from the round opening.

On the lower side of the sound conductor 22 of the speaker unit SP,
The upper side of the pickup 6 of the tone arm 8 is in sliding contact with the lower surface of the sound conductor 22.

The reproduction stylus 26 of the pickup 6 is pushed by the pressure of the stylus pressure spring 24 and pressed against the upper surface of the record 3. Thus, the pick-up 6 supports and slides on the portion of the speaker unit SP that is not supported by the pillar 21, and stylus pressure is applied to the pick-up 6.

What is the tone arm 8 and turn arm 13?
They are biased by the first return spring 7 and the second return spring 27 in the direction of the playback start point 4 of the recording groove, that is, in this case, in the direction of the periphery of the record 3 and in the direction of the speaker unit SP. .

What is the tone arm 8 and turn arm 13?
By the stoppers 9 and 28, respectively, against the first return spring 7 and the second return spring 27,
It is latched horizontally.

The first return spring 7 that biases the tone arm 8 is made by winding a thin elastic wire in the middle, wrapping the winding part around the top of the pivot shaft 14 of the tone arm 8, and attaching one end to the upper surface of the tone arm 8. The other end is hooked onto a protrusion protruding from the face plate 1'. In addition, the second return spring 27 that biases the turn arm 13 is made by winding a thin elastic wire in the middle to support the pivot shaft 1 of the turn arm 13.
The winding portion is wound around the top of the turn arm 13, and the other end is hooked onto a protrusion protruding from the upper surface of the turn arm 13 and the other end from a protrusion protruding from the face plate 1'.

The second switch 31 is a third return spring 31
The movable contact 31a energized by c and the movable contact 3
1a and a fixed contact 31b to which it is connected. The third return spring 31c that biases the movable contact 31a is the third return spring 31c that biases the movable contact 31a.
It also serves as part of 1a. That is, the movable contact 31a is formed by winding a thin wire midway in the longitudinal direction.
The wound part is hung on the top of the pivot 31d which is pivotally mounted, and one end is hung on the stopper 30 of the face plate 1'
The other end is hooked onto a projection protruding from the upper surface of the movable contact 31a.

That is, in the case of this embodiment, the record disc 3 is provided with two recording grooves 2, 2a, and their playback end points 5, 5a are both at positions on opposite sides of the center of the record disc 3. The playback start points 4 and 4a are both located at the record disc 3.
It is disposed around the periphery of the record disc 3, and at a position opposite to the record disc 3 in the diametrical direction. Thus, the recording groove 2 starts at a playback start point 4 and ends at a playback end point 5 on the opposite side of the center of the record 3. Another recording groove 2a is a playback starting point 4 that starts at a position on the opposite side of the record 3 in the diametrical direction from the recording groove 2.
It ends at the playback end point 5a on the opposite side across the center from a. In the case of this embodiment, the number of recording grooves 2, 2a is:
Although the number is two, the number is not limited to two, and depending on the application, the number may be more than that. Further, the tone arm 8 reaches the playback end point 5 of the recording groove 2, and the tone arm 8 reaches the turn arm 1.
3 to move onto the concave surface 20b of the upward cam 20, and further, due to the rotation of the upward cam 20, it rides on the riding surface 20c, and further, the protrusion 20d
, the turn arm 13 is lifted, the speaker unit SP moves up and away from the recording surface of the record 3 against the stylus pressure spring 24, the stylus pressure of the playback stylus 26 is released, and the pick-up 6 Then, the playback needle 26 returns to the playback starting point 4a of the recording groove 2a. When the pick-up 6 returns to the playback starting point 4a, the turn arm 13 is also biased by the upper cam 2 due to the bias of the second return spring 27.
0 and returns to its original position.

The regeneration end point 5 and the concave surface 20 of the upward cam 20
b, landing surface 20c, protrusion 20d, descent surface 2
The phase relationship with 0a is set as follows. Due to the rotation of the upward cam 20, the turn arm 13 enters the concave surface 20b of the upward cam 20 with good timing, and the turn arm 13 enters the concave surface 20b of the upward cam 20, and the contact surface 20c and the protrusion 20d
and reaches the descending surface 20a, where it leaves the upward cam 20 and returns to its original position. That is, the upward cam 20 is provided with a concave surface 20b, a running surface 20c, a protrusion 20d, and a descending surface 20a corresponding to the number of recording grooves 2 and 2a. Each of the concave surfaces 20b is provided at a position corresponding to the playback end point of each of the recording grooves, and each of the descending surfaces 20a is provided at a rotation angle corresponding to the playback start point of each of the recording grooves. is provided ahead of the playback start point.

With such a configuration, the turn arm 13 rotates the concave surface 20b and the riding surface 2 by the rotation of the cam 20.
0c and the protrusion 20d, the turn arm 13 lifts up the sound conductor 22, the stylus pressure is released, and the tone arm 8 is moved to the reproduction start point by the bias of the return spring 7. At this time, the cam 20 is rotating, and the turn arm 13 reaches the descending surface 20a from the protrusion 20d, releases the lifting of the sound conductor 22, and applies stylus pressure to the reproduction needle 26 of the tone arm 8 again. . At this time, one descending surface 20a is provided ahead of one specific reproduction starting point by a corresponding rotation angle so that the pickup 6 can be anastomosed to one of the specific reproduction starting points.

Therefore, even if the pickup 6 has a plurality of recording grooves, the pickup 6 can sequentially select the previously selected recording groove and another recording groove, and as a result, the recorded content of each recording groove can be played back in sequence. can.

In this embodiment, the concave surface 20b of the upward cam 20
, the landing surface 20c, the protrusion 20d, and the descending surface 20
The number of a is 2 for each recording groove 2 and 2a.
There are several. This invention is not limited to this, but depending on the application, by increasing the number of recording grooves 2 and 2a, the concave surface 20b, the riding surface 20c, the protrusion 20d, and the descending surface of the upward cam 20 can be formed. By providing the same number of recording grooves 2 and 2a as there are recording grooves 2 and 2a, each recorded content can be sequentially reproduced.

Next, the motor drive circuit in this embodiment will be explained with reference to FIGS. 1 and 5.

The motor drive circuit includes a motor M, a first switch 1
6, a second switch 31, a variable resistor 12, and a battery (or dry battery). Here, the second switch 31 has a movable contact 31a and a fixed contact 31b. Movable contact 31a
is formed by fitting the bent portion of the L-shaped crank member into the pivot 31d. One end of this L-shaped crank member is engaged with the tone arm 8 against the third return spring 31c.
When L moves toward the center of record 3,
The other end of the letter-shaped crank member is connected to the fixed contact 31b.
It is now being joined to.

Regarding the circuit connection, one of the lead wires of the motor M is connected to one end of the first switch 16, and the other end of the motor M is connected to the negative side of the battery E. The positive side of this battery E is connected to the other end of the first switch 16 via a variable resistor 12. The fixed contact 31b is connected to the motor M to which the first switch 16 is connected.
connected to the side. The side of the variable resistor 12 to which the first switch 16 is connected is also connected to the movable contact 31a. This movable contact 31a and variable resistor 1
2, the third return spring 31 urges the movable contact 31a fitted into the pivot 31d.
This is done via c.

Therefore, the operation of this device will be explained. That is, FIG. 3 shows the movable contact 31 of the second switch 31.
A indicates a state away from the fixed contact 31b, and the motor M is stopped. Now, when the first switch 16 is closed, the motor drive circuit is established, the motor M is driven, and the record disc 3 starts rotating. The tone arm 8 starts rotating toward the center of the record 3. The movable contact 31a of the second switch 31 pivots toward the fixed contact 31b by the urging of the third return spring 31c, and the movable contact 31a joins to the fixed contact 31b. When the movable contact 31a is connected to the fixed contact 31b, even if the first switch 16 is opened, the motor M - fixed contact 31b - movable contact 31a - variable resistor 12
-Since the motor drive circuit for the battery E is established, the motor M is driven and the record 3 continues to rotate. The state in which the movable contact 31a is joined to the fixed contact 31b is as shown in FIG. Record 3 continues to rotate, and tone arm 8
moves toward the center of the record 3 and reaches the playback end point 5. Therefore, the pick-up 6 pushes the turn arm 13 and moves it toward the upward cam 20.
Move it to the top surface. That is, the turn arm 13 rotates the concave surface 20 by the rotation of the upward cam 20.
b, rides on the riding surface 20c, and rides on the protrusion 20d. Thus, the turn arm 13 is lifted by the rotation of the upward cam 20,
The speaker unit SP resists the needle pressure spring 24,
The stylus force of the playback needle 26 moves upward in the direction away from the recording surface of the record 3, and the first return spring moves the stylus pressure of the playback needle 26 to a position where it can anastomose with the playback start point 4a of a recording groove 2a different from the previously selected recording groove 2. It returns and descends due to the bias of 7.

Note that when the tone arm 8 returns to the direction of the playback start point 4, the tone arm 8 pushes the movable contact 31a of the second switch 31 and closes the movable contact 3.
1a from the fixed contact 31b, the motor drive circuit is opened, the drive of the motor M is stopped, and the rotation of the record disc 3 is stopped. When the pickup 6 returns to the direction of the playback starting point 4, the turn arm 1
3 also moves away from the upper surface of the upward cam 20 and returns to its original position due to the bias of the second return spring 27.

In this manner, the present invention has a simple structure, and even if there are a plurality of recording grooves, the recorded contents of each recording groove can be sequentially reproduced.

[Brief explanation of drawings]

FIG. 1 is a plan view of the casing with the housing removed, FIG. 2 is a vertical sectional view of the main parts of the device,
Fig. 3 is a partially cutaway plan view of the essential parts showing the pickup placed so as to face the playback start point of the recording groove on the record, and Fig. 4 shows the pickup playing from the playback start point of the record groove on the record. FIG. 5 is a partially cutaway main part plan view showing a state in which the movable contact of the second switch is joined to the fixed contact as the movable contact moves toward the end point, and FIG. 5 is a power supply circuit diagram. 1...Casing, 2, 2a...Recording groove, 3...
...Record, 4, 4a... Playback start point, 5, 5a
...Playback end point, 6...Pickup, 7...1st point
Return spring, 8... Tone arm, 9... Stopper, 13... Turn arm, 16... First switch, 20... Upward cam, 20a... Descending surface, 20b... Concave surface, 20c... Rising surface, 2
0d...Protrusion, 22...Sound conductor, 23...Speaker, 24...Stylus pressure spring, 26...Regeneration needle, 27
...Second return spring, 28...Stopper, 3
1...Second switch, 31a...Movable contact, 31
b...Fixed contact, 31c...Third return spring, M...Motor, SP...Speaker unit,
E...lol.

Claims (1)

[Claims] 1. A record disc which is rotatably supported by a motor in a casing and has a plurality of recording grooves, and which moves along the recording grooves from a playback start point to a playback end point. The tone arm has a pick-up and is always biased toward a playback start point by a first return spring, a speaker, and a sound conductor, and is installed so that the pick-up is in sliding contact with the tone arm. When the speaker unit, the stylus pressure spring that pushes the sound conductor toward the record, and the tone arm reach the playback end point, it can be pushed by the tone arm and oscillate, and can also swing in the direction away from the record. A turn arm is arranged and pivotally mounted so as to be able to swing, and a turn arm is mounted on a record disc so that the turn arm is pushed by the tone arm, swings and rides on it, and lifts up the sound conductor of the speaker unit. An upward cam that is provided at the center position and rotates together with the record, a first switch for turning on and off the motor, and a position where the tone arm has returned, and when the tone arm returns, the movable contact a second switch that opens a movable contact by pressing and separating from a fixed contact, the simple gramophone for reproducing a plurality of recording grooves, the pickup being positioned in correspondence with the playback start point, the upward cam A concave surface into which the turn arm enters when pushed by the tone arm that has moved to the playback end point of the recording groove, and a turn arm that enters into the concave surface is moved upward by rotation of the upward cam. a surface on which the turn arm rides; a protrusion that lifts up the sound conductor when the turn arm further rides on it; and a descent surface that lowers the turn arm that rides on the protrusion by rotation of the upward cam; and the upward cam includes the concave surface, the riding surface, the protrusion, and the descending surface for the number of recording grooves, and further, each of the concave surfaces corresponds to the playback end point of each of the recording grooves. and each of the descending surfaces is provided ahead of the playback start point by a rotation angle corresponding to the playback start point of each of the recording grooves, so that the pick-up plays from the playback start point of the recording groove. When it moves to the end point and returns to the playback start point,
Select a green tone groove different from the recording groove selected above,
It is characterized by sequentially playing back different recording grooves.
A simple gramophone that plays multiple recording grooves in sequence.