KR830001277Y1 - Cartridge independent record player - Google Patents

Abstract

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Description

Cartridge independent record player

1 is a perspective view of an active record player embodiment according to the present invention.

2 is an enlarged longitudinal sectional view of the record player.

3 is an enlarged plan view of a record player.

4 is a circuit diagram of a control circuit for a record player.

5 is a schematic diagram of a record disc to be referred to for explaining the operation of the record player.

The present invention relates to a phonograph record player, and more particularly, to a toy type record player having a movable body.

A variety of toys with small phonographs are known, such as talking stars or animals, talking vehicles and acoustic vehicles. Such coupling of the phonograph to the body of the toy makes the configuration of the toy more complicated, and moreover, It is not easy to provide sound field or various sound reproduction.

Such a toy-type phonograph device is described in British Patent No. 1,145,550, which comprises a vehicle body having a pair of guide rails formed on a special gramophone record member, a wheel to be guided by the guide rail, and a guide rail on the record member. A helical acoustic groove formed between them and a cartridge member connected to the vehicle body and operative to reproduce the sound recorded in the acoustic groove on the record member.

In the case of this device, it may be possible to reproduce the sound for a long time in the case where the standard guide of the guide rail is quite large, but it is necessary to provide a special record member with two protruding guide rails for the sound to be reproduced. Disables normal disk record renewal because it does not have one.

To eliminate this drawback, an improved toy-type phonograph device has been devised which is capable of playing conventional record discs without any guide rails. According to this device, the pickup needle of the pick-up cartridge is moved when the movable body moves on the record disc. In order to reproduce the signal recorded in advance on the record disc, the vehicle body is provided with a traveling device and a pick-up cartridge so as to track the acoustic groove on the disk and guide the movable body along the acoustic groove according to this tracking. In this arrangement, however, due to the mechanical structure of guiding the needle along the acoustic groove and operating the drive wheel with a motor or the like, a movable body is caused from the circular motion, i.e. 45 revolutions per minute or Due to the relationship of centrifugal force resulting from the high traveling speed in the vicinity of the outer periphery of the rotational / minute record disc, there is a disadvantage that an unstable driving state is caused, such as the needle is separated from the acoustic groove.

It is therefore an object of the present invention to provide a record player that overcomes the above deficiencies. Another object of the present invention is to provide a record player capable of accurately reproducing sound signals on a conventional record disc.

Another object of the present invention is to provide a record player that is compact and simple to operate. It is yet another object of the present invention to provide a record player in which a rotating turntable as described above is not required. It is still another object of the present invention to provide a record player which enables a vehicle body to be moved on a normal record disc so that a signal recorded on the disc in a spiral groove can be reproduced by a pickup or cartridge installed in the vehicle body.

It is yet another object of the present invention to provide a record player in which a guide member is attached to a movable body so that the vehicle body is reliably driven along the acoustic groove on the record disc. Another object of the present invention is to provide a record player in which stable movement of the vehicle body toward the center of the record disc can be achieved by a guide member attached to the vehicle body. It is another object of the present invention to provide a record player in which a movable body for tracking a record disc can be stopped at a desired position on the record disc.

It is yet another object of the present invention to provide a drive device for driving a movable body and a body to be disposed on a disc according to a spiral sound groove on a disc, for use with a disc gramophone record having a spiral sound groove. And a guide structure coupled to the movable body to guide the movement of the movable body along the spiral acoustic groove, wherein the guide structure is a movable body. A shaft mounted on the support member, a support member connected to the shaft, a guide wheel rotatably mounted on the support member, and a guide member installed on the support member to mate with the acoustic groove, wherein the guide wheel is disposed in the driving direction of the vehicle body. It is to provide a record player, characterized in that arranged in front of.

The above and other objects and features of the present invention will become apparent from the following detailed description of the preferred embodiment with reference to the drawings. First, referring to the drawings of FIGS. 1 to 3, the record player 10 according to the present invention is a conventional gramophone record disc having a spiral groove 13 in which sound or audio signals are recorded on the upper surface of a common group. It will be appreciated that it has a movable vehicle body 11 positioned on 12). The body 11 has a chassis 14 (seconds and thirds) at the bottom thereof, and at the rear of the chassis there are formed laterally facing cutouts 15, 16 and at the center of the front part. A fan-shaped cutout 17 is formed (see FIG. 3). The cutout 17 is provided with a cap-shaped frame 18, which is secured to the chassis 14.

The vehicle body 11 is an upper surface of the record disc 12 by means of a rear wheel 20 located at one side of the steerable guide wheel 19 and the vehicle body 11 and a drive wheel 21 located in the vicinity of the opposite side. Supported by cloud movement in the sky In addition to the wheels 19, 20, and 21 provided for rolling contact with the upper surface of the record disc 12, the body 11 of the record player 10 is laterally opposed in the front part. Front wheels 22 and 22 are provided, and a rear wheel 24 laterally opposed to the rear wheel 20 is provided near the driving wheel 21. The front wheels 22, 23 and the rear wheels 24 are raised from the top surface of the record disc 12 when the wheels 19, 20 and 21 are cloud-aligned with the top surface of the disc. Or it is standardized and positioned to be inoperative.

In order to drive the vehicle body 11 of the record player 10 along the surface of the record disc 12, the electric motor 25 is suitably mounted in the vehicle body 11 on the chassis 14 and in the sleeve bearing 29. Has a motor shaft 26 connected via a gear transmission 27 and one end of the shaft 28 extending laterally. The drive wheel 21 is fixed to the end of the shaft 28, far away from the gear transmission 27. The battery 30 mounted on the motor 25 in the vehicle body 11 (FIG. 2) supplies electric power for driving the motor 25 as described in detail below. The rear wheel 20 is suitably mounted on the vehicle body 11 so that when the vehicle body 11 is moved by the drive wheel 21, it is freely rotated in a rolling contact with the record disc.

The guide wheel 19, which is part of the guide structure, is rotatable on the mandrel 31 mounted at one end of the mounting bracket 32. The other end of the mounting bracket 32 is mounted under the frame 18 for rotation about an axis perpendicular to the surface of the record disc. For example, in the preferred embodiment shown, the mounting bracket 32, together with the mounting bracket 32, changes in response to the rotation of the shaft 33 with a variable resistor 35 fixed to the frame 18 with resistance. The downwardly extending through the frame 18 is fixed by screws 33 on the vertical shaft 33. The wheel 19 is rotatably mounted on the cartridge support arm or frame 36, ie the frame 36 extending from the bracket 32 under the frame 18, the end of the frame 36 being a mandrel ( Since it is mounted at the ends of 31, the frame cartridge support arm 36 is mechanically mounted to the shaft 33 via the bracket 32 and pivotally mounted about a horizontal axis parallel to the surface of the record disc 12. . The cartridge or pickup 37 is suitably mounted in the frame 36 in front of the mandrel 31 and has a needle 38. Naturally, since the frame 36 is to be pivoted downward, the needle 37 is therefore pressed to mate with the upper surface of the record disc 36 to track the spiral groove 31 for reproduction of the recorded signal. This embodiment is characterized in that the spigot 38 is located in front of the shaft 13 and the needle 12 is provided such that the wheel 19 guides the direction of movement.

Referring to FIG. 4, the speed control circuit for the motor 25 includes a storage battery 30, a variable resistor 35, an on-off switch 39, a speed select switch 40, a PNP transistor 41, It can be seen that the NPN transistor 42, the capacitor 43, and the resistors 44, 45, and 46 are included. Transistors 41, 42, capacitors 43, and resistors 44-946 are mounted on frame 18 within vehicle body 11 to accumulate battery 30, motor 25, variable resistor 35. And a printed circuit board 47 appropriately electrically connected to the switches 39 and 40. The switches 39 and 40 are mounted in the vehicle body 11 with the switch operation members 39a and 40a extending out of the vehicle body for operation by the operator of the record player 10. The circuit board 47 has a conventional amplifier circuit which amplifies properly so that the signal reproduced by the cartridge 37 drives the speaker 48 mounted on the upper portion of the vehicle body 11. The sound of the reproduced sound is normally controlled by the adjustment of the variable resistor 50 (FIG. 2) by manual adjustment of the knob 51 in the form of an auxiliary tire installed in front of the vehicle body 11. As shown in FIG.

Referring back to FIG. 4, the emitter of the transistor 41 is connected to the positive side of the storage battery 30 via an on-off switch 39, and the collector of the transistor 41 is connected to the storage battery through the motor 25. You will see that it is connected to the negative side of. The capacitor 43 is connected across the switch 39 and the battery 30, and the base of the transistor 41 has a transistor 42 having an emitter connected to the negative side of the battery 30 via a resistor 46. Is connected to the collector. The base of the transistor 42 is connected to a movable tab 35a of the variable resistor 35 connected between 45 of the resistors 44 for forming a voltage divider. It can be seen that the speed selector switch 40 is connected in parallel with the resistors 44 to shunt the resistors 44 when the switch 40 is opened and closed. The variable resistor 35 is moved in response to the rotation of the shaft 33 due to the rotation of the mounting bracket 32 with the tab 35a of the variable resistor 35. The switch 55 is provided in the frame cutout 17. The switch 55 is of the normally closed type and is opened by the frame 36 when the vehicle body 11 tracks the inner part close to the center of the record disc.

As shown in FIG. 2, the handle 51 is connected to the variable resistor 52 through the shaft 53 and is disposed outside the vehicle body 11. The handle 51 is used to control the volume of the speaker from the outside of the vehicle body 11. The operation of the above-described record player 10 according to the present invention is as follows.

Initially, the user places the vehicle body 11 at a predetermined position at which the recording and playback operation is to be started, for example, at a position A (FIG. 5) far from the center of the disk 12, so that the cartridge 37 can be moved. The needle 38 is defined with the spiral groove 13. And Open or close the speed selector switch 40 to select rotation / burn or 45 revolutions / minute. Next, the switch 39 is closed to allow the motor 25 to perform the initial operation. According to the operation of the motor 25, the rotation of the motor shaft 26 is transmitted to the shaft 28, and therefore the driving wheel 21, through the gear transmission 27 and correspondingly according to the movement of the vehicle body 11. As the needle 38 is moved along the groove 13, the recorded sound or audio signal is reproduced by the cartridge 37, which is amplified and applied to the speaker 48 to generate as audible sound. . In this case, the volume is controlled by the adjustment of the knob 51.

The vehicle body 11 moving on the record disc 12 is adjusted by registration of the needles 38 in the groove 13. In particular, the guide structure consisting of the cartridge support frame 36, the mounting bracket 32 and the guide wheel 19 is rotated about the vertical axis of the shaft 33, the spiral groove at the position where the needle 38 is matched The tangent of (13) and the line extending across the axis of the shaft 33 from the needle 38 are matched. Thus, when the needle 38 is moved inwards while turning along the spiral groove, the guide structure consisting of the frame 36, the mounting bracket 32 and the guide wheel 19 is centered about the axis of the shaft 33. Gradually rotated. In other words, as an example, the guide structure rotates from the angle θ ₁ when the vehicle body 11 is placed to the angle θ ₂ of the position B. Therefore, when the vehicle body 11 is rotated on the disc 12, the guide wheel 19 is gradually rotated about the axis of the shaft 33, and the line radius of the spiral groove in which the vehicle body 11 travels gradually increases. Is reduced.

Since the record disc is manufactured in a conventional manner, the sound or audio signal recorded in the spiral groove 13 is reproduced during the relative movement of the needle and record disc at a constant angular or rotational speed. However, the constant acceleration or rotational speed of the needle associated with this record disk requires that the linear velocity be higher when the needle matches the outer line than when the needle matches the inner line of the spiral groove. Thus, the shaft 33 of a rotation example of the axis of the shaft 33 of the guide structure, position (A) the variable resistor 35 corresponding to the movement to the angle θ ₂ of the above (B) from the angle θ ₁ of And the tab 35a (FIG. 4) of the variable resistor 35 is moved downward to reduce the current flowing to the motor 25 through the transistor 41, thereby moving the vehicle body 11. The speed is gradually reduced as it is moved inward.

In the present invention, the guide wheel 19 can be rotated left and right about the shaft 33 and at the same time the guide wheel 19 is disposed in the forward direction of the car body 11 relative to the shaft 33. Attaches importance to Therefore, according to such a structure, when the needle 38 is gradually moved inward along the spiral groove 13, the direction of the guide wheel 19 also gradually changes inward, and in accordance with such a change in direction, the guide wheel is relatively (19) is always maintained in the tangential direction of the spiral groove 13, resulting in a large centripetal force acting on the guide wheel 19, which is greatly increased as the rotational speed associated with the disk 12 is increased. do. Therefore, the centrifugal force generated while the vehicle body 11 rotates at high speed on the disk 12 will be effectively canceled, the needle 38 will not be released from the acoustic groove 13 and the vehicle body 11 will be stable running. Will be done.

In FIG. 4, closing the switch 40 to shunt the resistor 44 increases the potential level applied to the base of the transistor 42 regardless of the potential change caused by the movement of the tab 35a. The motor 25 is driven at a relatively high speed and the vehicle body 11 is driven at 45 revolutions per minute on the disc 12. On the other hand, when the switch 40 is opened so that the resistor 44 is connected in series with the variable resistor 35 and the resistor 45, the potential applied to the transistor 42 in accordance with the change in the resistance value of the variable resistor 35 is obtained. Is lowered correspondingly, so that the motor 25 rotates at a low speed, so that the traveling speed of the vehicle body 11 running on the disc 12 Rotations / minute.

When the body 11 reaches a position close to the center of the record disc 12, the frame 36 comes into contact with the switch 55 (FIG. 3), so that the power supplied to the motor 25 is cut off, and as a result the body Running of 11 is stopped. Although the needle 38 is used as part of the guide structure in the above embodiment, the needle 38 may be replaced with a brush or similar parts.

Although the present invention has been described with respect to specific embodiments, it is apparent to those skilled in the art that various modifications may be made without departing from the spirit and scope of the present invention, which will belong to the rights of the present invention.

Claims (1)

For use with discs with helical acoustic grooves, a movable body disposed on a record disc, a drive for driving the body according to the helical acoustic grooves on the disc, and a sound for defining a spiral acoustic groove in relation to the body. In a cartridge autonomous record player having a reproducing apparatus and a guide structure coupled to a vehicle body and guiding movement of a vehicle body along a spiral acoustic groove, at one end of a bracket 32 having a shaft 33 mounted at one end thereof. The guide wheel 19 is rotatably mounted, and the mandrel 31 of the guide wheel 19 is mounted so as to be in front of the traveling direction of the vehicle body 11 by a predetermined distance with respect to the axis of the shaft 33. A cartridge independent record player, characterized in that.