JPH0154761B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simple gramophone, and in particular, when reproducing a recording groove of a record having a plurality of recording grooves, it is possible to easily select the playback and continuously repeat the playback by simply operating a switch. It is now possible to switch between playback once at a time.

A device for selectively reproducing a recording groove of a record disc having a plurality of recording grooves has already been provided.

However, this conventional device selects recording grooves purely mechanically, and its structure is extremely complicated, causing problems in smoothness and reliability of operation. Also, from continuous playback of the selected recording,
There has not yet been provided a device that can reliably switch to another recording/playback mode each time the operation stops after the playback of the recorded content is completed.

This invention addresses this problem with simple phonographs, and its purpose is to easily select and select the playback grooves of a record having multiple recording grooves by simply operating a switch. Switching between continuous repeat playback or single playback,
The purpose of this invention is to provide a simple gramophone that is capable of.

In this invention, the switching operation of the first switch simultaneously drives the motor that drives the turntable and the record and the actuator that moves the movable stopper, or drives only the motor that drives the turntable and the record. You can now choose between two types of connections. By this,
In the case of the former selection, the movable stopper moves to the return point of the pick-up so that the pick-up selects the inner playback starting point of the two recording grooves that are staggered inward and outward. By positioning the player as desired, or by turning only the turntable or record, the pick-up can be made to select a playback starting point outside the fixed stopper.

As shown in the illustrated embodiment, the present invention includes a motor that is started and stopped within the casing 1 via a switch.
A record disc 3 which is rotatably supported by M ₁ and has a plurality of recording grooves 2, 2a, and a playback starting point 4, 4a along the recording grooves 2, 2a.
a tone arm 8 having a pickup 6 that moves from the beginning toward the end point of reproduction, the pickup 6 being always biased toward the start point 4, 4a of reproduction by a first return spring; a speaker; a sound conductor 22 that contacts a part of the sound conductor 22 and transmits vibrations of the pickup 6 moving along the recording grooves 2 and 2a to the speaker, and the pickup 6 slides on the lower surface of the sound conductor 22. A speaker unit SP installed so as to be in contact with the speaker unit SP and a stylus pressure spring 24 that pushes the sound conductor 22 toward the record 3
When the tone arm 8 reaches the playback end point, it can be pushed by the tone arm 8 and oscillate, and
A turn arm 13 is arranged and pivotally mounted so as to be able to swing in a direction away from the record disc 3, and this turn arm 13 is pushed by the tone arm 8 and swings, causing the speaker unit SP to mount.
In order to be able to lift the sound carrier 22 of
an upward cam 20 provided at the center of the record 3; a movable stopper 30 whose position changes to select the position to which the tone arm 8 returns;
It includes an actuator M ₂ operated by a switch to change the position of the movable stopper 30, and a battery ₁₁ for driving the motor M ₁ and the actuator M 2. is the playback starting point 4 of the record 3 along the trajectory of the pick-up 6;
4a to above the upward cam 20, so that the pickup 6 corresponds to the playback start point 4, 4a and can selectively position a plurality of recording grooves. In _the simple gramophone _that reproduces
the turn arm 1;
a second switch comprising a third contact for turning off the motor when 3 is pressed by the tone arm 8 and turning on the motor at other times;
The motor M ₁ - the first contact C - a first connection system of the battery 11, the actuator M ₂ - the first contact D - a second connection system of the battery 11, and the motor M ₁ - the second contact B - a third connection system of the battery 11; and the motor M ₁ - the third contacts 28a, b - a fourth connection system of the battery 11.
By selecting contacts C and D and turning on the first and second connection systems, the recorded content is continuously played back while changing the position of the movable stopper 30, and the second contact B is selected. By turning on the third connection system, the recorded content is continuously played back without changing the position of the movable stopper 30, and furthermore, the selection of the first contact or the second contact is canceled. , the third contact 28a,
The present invention relates to a simple gramophone that selects and reproduces a plurality of recording grooves, characterized in that by turning off the fourth connection system by opening b, the recorded content is reproduced every time.

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, and a motor for driving a record disc is mounted on the chassis side end opposite to the part where the battery magazine 11 is installed.
M ₁ is fixed. On the surface plate 1' of the casing 1 between the position where the battery magazine 11 is installed and the position where the motor _M1 is installed, a tone arm 8 and a turn arm 13 for returning the tone arm are installed, respectively. It is pivotally connected by pins 14 and 15.

Furthermore, an actuator _M2 is fixed on the side end of the chassis where the battery magazine 11 is provided. Here, as the actuator _M2 , a motor is used, and the shaft portion 30b of the motor is
A movable stopper 30 whose tip is directed to the return position of the tone arm 8 is fixed. Movable stopper 3
0 is always biased by a spring 30a in a direction in which the tone arm 8 is moved backward from its return position.

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 M ₁ and the turntable 18 .

As is clear from FIGS. 2 and 3, 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 restoring 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 playback needle 26 when applying stylus pressure to the playback needle 26 of the pick-up 6 after returning to the playback start 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 4. 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 lands on the recording surface of record 3 at the right time.

The sound carrier 22 moves along the trajectory of the pickup 6 to the playback starting point 4, 4a of the record 3.
In this embodiment, as shown by the two-dot chain line in FIG. The tip of the other end is
As shown in FIG. 2, it is in contact with the lower end of the speaker SP. This sound conductor 22 is used to reproduce the recorded content by transmitting the vibrations generated when the reproduction needle 26 scans the recording groove of the record disc 3 to the speaker via the pickup 6.

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 stylus pressure spring 24 connects the speaker unit SP to a portion not supported by the support 21 and biases it toward the recording surface of the record disc 3. A wide passage 25 is formed in the face plate 1' along the trajectory of the pickup 6 of the tone arm 8, which is circularly opened near the center of the record 3, and from the round opening, The aforementioned cam 20 is connected to the face plate 1'
It's coming up.

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 on the lower side of the sound conductor 22 of the speaker unit SP.

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. Therefore, 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. . In particular, the second return spring 27
It also serves as a return spring and a lead wire for the electric circuit described later.

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'. Further, in the figure, 28a is a stopper/fixed contact that also serves as a stopper for the turn arm 13. The second return spring 27 that biases the turn arm 13 is made by winding a thin elastic wire in the middle and wrapping the wound part around the top of the pivot shaft 15 of the turn arm 13. It is connected to a movable contact 28b provided on the turn arm 13, and the other end is hooked to a stopper provided on the face plate 1'. In this way, the second switch 28
are the stopper/fixed contact 28a and the movable contact 28b.
It consists of

Next, actuator M ₂ and movable stopper 30
This will be explained in detail.

The movable stopper 30 has a rectangular shape, and has a through hole in a boss portion protruding from the rear end in the longitudinal direction.The shaft portion 30b of the motor, which is the actuator _M2 , is passed through this through hole. It is stuck to. The movable stopper 30 is provided with a protrusion 31 at the center in the longitudinal direction, which spans one end of the return spring 30a. Return spring 30a
is wound around the boss portion, one end of which is spanned over the protrusion 31, and the other end spanned over a protrusion 32 protruding from the face plate 1' of the casing. Movable stopper 3
When the motor serving as the actuator _M2 is driving, the tip of the tone arm 8 pivots from the position of the stopper 9 to a position biased towards the playback end point, stops the restored tone arm 8 at that position, and stops the tone arm 8 at that position. The reproduction start point 4a of the inner recording groove 2a is selected. When the motor serving as the actuator M ₂ stops driving, the movable stopper 30 is moved backward by the spring 30a to return the tone arm 8 to the stopper 9, thereby opening the recording groove 2 on the outside of the record disc 3. Select playback start point 4.

Note that the actuator _M2 may use a solenoid and a movable stopper provided on the solenoid instead of a motor. When using a solenoid, you can obtain exactly the same effect and effect as when using a motor, but the weight of the iron core of the solenoid itself affects the recorder's performance when it is placed face down or when it is upright. When used, slight deviation occurs and it is difficult to accurately determine the position of the movable stopper. Therefore, it is desirable to use a motor.

Next, a drive circuit for the motor and actuator in this embodiment will be explained with reference to FIGS. 1 and 4.

The drive circuit of the motor M ₁ and the drive circuit of the actuator M ₂ are a record drive motor M ₁ - first switch 33 - battery E (dry battery) system and a record drive motor M ₁ - second switch 28.
- A battery E (dry battery) system is connected via the first switch 33. Here, the first switch 33 consists of contacts B, C, and D, and can be switched in three stages. That is, when the movable contact 33a is located at the intermediate position, no current flows through the motor drive circuit, and the record drive motor _M1 and the motor serving as the actuator _M2 are not driven. The movable contact 33a is B
When connected to the contact side, current flows through the drive circuit of motor _M1 , and the record drive motor _M1
Activate. When the movable contact 33a is connected to the C and D contact sides, current flows through the drive circuit of the motor _M1 and the drive circuit of the actuator _M2 , thereby driving the record drive motor _M1 and the motor serving as the actuator _M2 . Activate.

That is, the drive circuit of motor M ₁ and the drive circuit of actuator M ₂ are a connection system of motor M ₁ -C contact - battery E, a connection system of actuator M ₂ -D contact - battery E, and a connection system of motor M ₁ -B. It consists of a contact-battery E connection system, and a motor M ₁ -contact 28a, b-battery E connection system.

Next, as a specific method of circuit connection, the record drive motor _M1 has one terminal connected to the second return spring 27 of the turn arm 13,
The other terminal of the record drive motor _M1 is connected in parallel to the B contact and C contact connected in series in the first switch 33, and the other terminal is connected to the battery E.
and one terminal of the motor as actuator _M2 . The positive side of the battery E is connected to the stopper/fixed contact 28a of the second switch 28 and the B contact of the first switch 33. The other terminal of the motor as actuator _M2 is connected to the B contact of the first switch 33.

Therefore, the operation of this device will be explained next. That is, FIG. 4 shows a state in which the movable contacts of the first switch 33 are separated from the contacts B, C, and D, and the motors serving as the record drive motor _M1 and the actuator _M2 are as follows. It's stopped.
Now, move the movable contact 33a of the first switch 33 to B.
When the contacts are closed, the drive circuit of motor M ₁ is established,
The record drive motor _M1 is activated and the record 3 starts rotating. The tone arm 8, which is at the playback end point, then begins to rotate toward the center of the record 3. The pick-up 6 of the tone arm 8 pivots toward the center and turns the turn arm 1.
Press 3. At this time, the movable contact 28b of the second switch 28 separates from the fixed contact 28a, but the movable contact 33a of the first switch 33 - the B contact of the first switch 33 - the record drive motor M ₁ -
Since the drive circuit for battery E's motor _M1 is established, the record drive motor _M1 operates,
Record 3 continues to rotate. As the record 3 rotates, the pickup 6 further
Proceed toward the center, turn the turn arm 13, and
Push it to ride on the upward cam 20 and return the pick-up 6 to the stopper 9 position, that is, the playback starting point 4 of the outer groove 2 of the record 3. At the same time, the turn arm 13 also serves as a turn arm spring and lead wire. Due to the elasticity of the second return spring 27, it returns to the direction away from the cam 20,
The movable contact 28b of the second switch 28 is the fixed contact 28a (stopper and contact) of the second switch 28.
connected to. Therefore, pick up 6 again.
Even if stylus pressure is applied to the switch and the movable contact is opened from the B contact of the first switch 33, the fixed contact 28a of the second switch 28 and the movable contact of the turn arm 13 are connected, and the fixed contact of the second switch 28 is opened. 28a-
Since the drive circuit of the movable contact 28b of the second switch 28 - the record drive motor M ₁ - the motor M ₁ of the battery E is established, the record drive motor M ₁ is driven, and the record drive motor M 1 is driven. Continue to rotate,
When the pickup 6 pushes the turn arm 13, the record 3 continues to rotate until the movable contact 28b of the second switch 28 is separated from the fixed contact 28a, and the reproduction of the outer groove 2 is completed.

Next, when the movable contact 33a of the first switch 33 is closed to the C and D contacts, a drive circuit for the motor _M1 is established, and a drive circuit for the actuator _M2 is also established, and the record drive motor M1 and the drive circuit for the actuator _M2 are also established. A motor as actuator M ₂ operates simultaneously to drive the record 3 and the movable stopper 30 . The movable stopper 30 then moves to a position closer to the reproduction end point than the fixed stopper 9, and stops the returned pick-up 6 there.

Therefore, the pickup 6 selects an inner recording groove 2a that is different from the recording groove 2 that was previously recorded. Therefore, stylus pressure is applied to the pick-up 6 again,
Move toward the end of playback.

As explained above, according to the present invention, when playing back a recording groove of a record having a plurality of recording grooves, it is possible to easily select the playback, continuous repeat playback or one-time playback by simply operating a switch. This has the effect of providing a simple gramophone that can be switched between playback and playback.

[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,
3A and 3B are plan views showing the positional relationship between the regeneration start point and the cam descent, and FIG. 4 is an electric circuit diagram. DESCRIPTION OF SYMBOLS 1...Casing, 2, 2a...Recording groove, 3...Record, 4, 4a...Playback start point, 6...Pickup, 7...First return spring, 8...Tone arm, 9...Stopper, 13...Turn arm, 20...
Upward cam, 22...Sound conductor, 27...Second return spring, 30...Movable stopper, 33...First switch, _M1 ...Record drive motor, _M2 ...Actuator, SP...Speaker unit, E...Battery .

Claims (1)

[Scope of Claims] 1. A record disc that is rotatably supported in a casing by a motor that is started and stopped via a switch, and has a plurality of recording grooves, and a record disc that is played back along the recording grooves. A tone arm having a pickup that moves from a start point to a playback end point, the pickup being always biased toward the playback start point by a first return spring, and a speaker and a part of the speaker come into contact with each other. a speaker unit comprising a sound conductor that transmits vibrations of the pickup moving along a recording groove to the speaker, and installed so that the pickup comes into sliding contact with the lower surface of the sound conductor; a stylus pressure spring that presses the tone arm toward the record; and a pivot arranged so that when the tone arm reaches the playback end point, it can swing by being pushed by the tone arm, and also swing in a direction away from the record. The turn arm that was worn,
An upward cam provided at the center of the record and the tone arm are connected to each other so that the turn arm can lift the sound conductor of the speaker unit that is pushed and swung by the tone arm. A movable stopper whose position changes to select a return position, an actuator operated by a switch to change the position of the movable stopper, and a battery for driving the motor and the actuator,
Furthermore, the sound conductor has a shape that extends from the playback start point of the record to above the upward cam along the locus of movement of the pick-up, so that the pick-up reaches the playback start point. A simple phonograph for selectively reproducing a plurality of recording grooves, which corresponds to the above and can be selectively positioned, includes a first contact for turning on the actuator and the motor, and a first contact for turning on only the motor. a first switch that turns off the motor and the actuator when the turn arm is pushed by the tone arm; A second contact with a third contact for turning on the motor at other times.
a switch, comprising a first connection system of the motor-the first contact-the battery, a second connection system of the actuator-the first contact-the battery, and a second connection system of the motor-the second contact- A third connection system of the battery and a fourth connection system of the motor-the third contact-the battery are configured, and by selecting the first contact and turning on the first and second connection systems, A state in which the position of the movable stopper is not changed by continuously playing back the recorded content while changing the position of the movable stopper, and by selecting the second contact and turning on the third connection system. Then, the recorded content is continuously played back, and further, the selection of the first contact or the second contact is canceled, and the fourth connection system is turned off by opening the third contact, whereby one part of the recorded content is played back. A simple gramophone that selects and reproduces a plurality of recording grooves, characterized in that reproduction is performed every time. 2. The actuator includes a motor for driving a movable stopper, and the movable stopper fixed to the output shaft of the motor engages and stops the pick-up of the tone arm, and selects the playback start point at that position. The simple phonograph described in paragraph 1.