JPS6053363B2 - Cartridge self-propelled record player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-propelled cartridge type record player that plays records by running a traveling body having a pickup cartridge over a record, and particularly relates to a self-propelled cartridge type record player that plays a record by running a traveling body having a pickup cartridge over a record. This invention relates to a device in which the driving motor of the traveling body can be stopped by simply making the traveling body slightly levitate during playback of a record.

A conventional record player consists of a turntable that rotates a record, a motor that drives the turntable, a cartridge that picks up signals, etc., and its structure is complex and quite large.

Even if an attempt is made to miniaturize such a player, it is limited by the size of a record, and it is impossible to miniaturize it to a smaller size. Therefore, a self-propelled cartridge type record player has been proposed in the past, in which a running body in which a cartridge and an audio reproducing means such as a speaker are incorporated is run over a record to perform a performance. However, in order to stop a conventional record player of this kind while it is running, it is necessary to manually turn off the power switch for the drive device installed on the running vehicle, which is a hassle. This operation has led to accidents in which the sound grooves and playback stylus of records are damaged. The present invention aims to eliminate such conventional drawbacks,
Therefore, an object of the present invention is to manually lift the reproducing needle of the cartridge provided on the traveling body while it is traveling along the sound groove of the record or in the endless groove. Thus, the traveling body can be stopped easily and safely, and damage to the sound groove and the regeneration needle caused by direct operation of a manual switch provided on the traveling body, as in the conventional case, can be prevented. The purpose of the present invention is to provide a new, one-unit, self-propelled record player.

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 to 3, a traveling body 2 placed on a record disc 1 is designed to resemble a vehicle such as a bus.
Inside the running body 2, there is a power battery 3, a motor 4, a gear mechanism 5, a speaker 6, a circuit board 7 on which a speed control circuit for the motor 4, an amplifier, etc. are wired, a speed control volume 8, and a volume adjustment volume 9. etc. are incorporated in appropriate positions. Further, on the lower surface of the main body of the running body 2, there is provided a light-operating switch 10 such as a microswitch for turning on and off the supply of power to the motor 4, and the actuating piece 10a of this switch 10 is operated in the vertical direction as described below. It faces an arm that can rotate freely. When the traveling body 2 is picked up and floated, the switch 10 is opened to cut off the power supply. 11 is a speed changeover switch for the motor 4, and 12 is a volume adjustment knob, which is attached to the outside of the traveling body 2 so that it can be arbitrarily adjusted by hand from the outside.

The knob 12 has a design that resembles a tire, and is fixed to the adjustment shaft 13 of the volume 9. Front wheels 14 and 15, rear wheels 16 and 17, a drive wheel 18, a guide wheel 19, and a cartridge 20 are provided at the bottom of the traveling body 2. When the traveling body 2 travels, only the driving wheels 18, rear wheels 16, and guide wheels 19 actually rotate in contact with the record 1, and the other front wheels 14, 15 and rear wheels 17 are dummy wheels. It is something. The driving wheel 18 is provided near the rear wheel 17, which is an inner wheel with respect to the rotating direction when the traveling body 2 runs on the record 1 in the rotating direction indicated by the arrow in FIGS. 1 and 2. There is. The rotation of the motor 4 is transmitted to the drive wheels 18 via a gear mechanism 5, so that the traveling body 2 is driven. The guide ring 19 is rotatably supported on a shaft 22 provided on a mounting plate 21.

This mounting plate 21 has screws 24 attached to the adjustment shaft 23 of the volume 8.
Fixed by Therefore, the guide wheel 19 is rotatable to the left and right with respect to the traveling direction of the traveling body 2 together with the adjustment shaft 23. One end of an arm 25 is pivotally supported on the shaft 22 so as to be rotatable in the vertical direction, and a cartridge 20 having a regeneration needle 26 is attached to the other end of the arm 25. Therefore, this power. - The trigger 20 is rotatable in left, right, up and down directions. FIG. 5 shows a speed control circuit for the motor 4, in which transistors 27, 28, resistors 29, 30, 31 and a capacitor 32 are connected to the circuit board 7.
Arranged on top! These elements, the power supply battery 3, the motor 4, the power switch 10, the speed changeover switch 11, and the volume 8 are constructed as shown in the figure.

When the adjustment shaft 23 of the volume 8 is rotated, the slider 33 moves and its resistance value changes. As a result, the base voltage of the transistor 27 is controlled, the current flowing into the motor 4 is controlled, and the rotational speed of the motor 4, that is, the traveling speed of the traveling body 2 is controlled. At the same time, the rotational speed of the motor 4 can be changed by opening or closing a switch 11 depending on whether the record 1 is for 331B rotation or for 331B rotation. Next, the operation of the above configuration will be explained with reference to FIG.

In FIG. 4, first, the traveling body 2 is placed at position A on the record 1, and the reproduction needle 26 of the cartridge 20 is inserted into the sound groove 34.

Next, the speed changeover switch 171 is opened or closed depending on the rotational speed of the record 1, and then the power switch 10 is closed. This causes the motor 4 to rotate, and this rotation causes the gear mechanism 5 to rotate.
The signal is transmitted to the drive wheels 18 via the drive wheel 18, and the traveling body 2 starts running. Depending on this running, the cartridge 20 is regenerated and the needle 2
6 traces the sound groove 34 and transmits the reproduced signal to the circuit board 7.
The signal is amplified by an amplifier installed in the amplifier and then added to the speaker 6. In this case, the cartridge 20 not only reproduces the signal but also serves to steer the traveling body 2. In other words, regenerated needle 2
6 traces the spiral sound groove 34,
The cartridge 20 gradually rotates inward of the record 1 together with the arm 25 about the adjustment shaft 23 as a fulcrum.
Along with this, the guide wheel 19 also rotates inward with respect to the traveling direction. Following this rotation, the traveling body 2 rotates and travels on the record 1 while gradually moving inward. In this case, the cartridge 20 only changes the direction of the guide wheel 19 via the arm 25, and the actual steering is performed by the guide wheel 19, so that there is not much burden on the regeneration needle 26. Assume that the traveling body 2 gradually moves inward while rotating on the record 1 as described above, and moves from position A to position B in FIG. 4, for example. In this case, the traveling body 2 has moved substantially in parallel as shown in the figure, and at this time, the cartridge 20 has rotated together with the arm 25 from an angle θ1 to θ2, and therefore the adjustment shaft 23 of the volume 8 has also moved closer to the mounting plate 22. via (02
-θ1), and along with this, the slider 33 in FIG.
moves down the diagram. As a result, the current flowing into the motor 4 decreases, the rotational speed decreases, and therefore the traveling speed of the traveling body 2 decreases. As described above, as the adjustment shaft 23 is rotated in accordance with the movement of the traveling body 2 inward, the speed of the traveling body 2 gradually decreases. This allows the playback needle 26 to always trace the sound groove 34 at a constant angular velocity, making it possible to perform faithful playback similar to that of a cartridge in an ordinary record player. By the way, in a self-propelled cartridge type player, the operation of stopping the traveling body as described above may damage the record, which is extremely difficult to handle.

Therefore, when the playback needle 26 of the cartridge 20 reaches the middle or end of the sound groove of the record,
To stop the regeneration operation, the arm 25 acting as a steering device as described above is rotated so as to open about the shaft 22 with respect to the traveling body 2, and the power switch 10 is turned on. When opened, the power supply to the motor 4 can be cut off. By stopping the motor 4, the traveling body 2 can be safely stopped and the traveling body 2 can be easily placed on the record. Note that as the switch activated by the displacement of the arm 25, a photoelectric switch or an electromagnetic switch that blocks the optical path using a shutter can be used as desired. In addition, if a manually operated main switch 35 for opening and closing the power supply is connected in series to the power switch 10, this main switch 35 can be provided so as to protrude outside the traveling body 2, and can be used except when playing records. cause the motor to be driven unnecessarily,
This has the advantage of being able to prevent wasteful consumption of power source capacity such as batteries. As described above, according to the present invention,
The traveling body is provided with a traveling means and a pickup cartridge, and when the traveling body travels over the record, the reproducing needle of the pickup cartridge traces the sound groove of the record to reproduce the signal, and this reproduction During or at the end of the operation, the power switch activated by the levitation operation of the traveling body is opened to cut off the power supply to the traveling means, thereby causing the traveling body to float slightly above the record. At this point, the drive of the running body is immediately stopped, thereby preventing damage to the sound groove of the record and the playback needle.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention.
The figure is a perspective view showing the playing state, the second figure is a cross-sectional side view, and the third figure is a perspective view showing the playing state.
4 is a schematic plan view for explaining the operation, and FIG. 5 is a circuit diagram showing an embodiment of a motor speed control circuit. 1... Le cord board, 2... Running body, 4...
...Motor, 6...Speaker, 10...
...Power switch, 18...Drive wheel, 19
...Guide wheel, 20...Zeck up cartridge, 25...Arm, 26...Reproduction needle, 34...Tone groove.

Claims (1)

[Claims] 1. A traveling body is provided with a traveling means and a pickup cartridge, and when the traveling body runs over a record, a reproducing needle of the pickup cartridge traces the sound groove of the record to reproduce the signal. A self-propelled cartridge type record player, characterized in that during or at the end of playback, a power switch activated by a floating operation of the traveling body is opened to cut off the supply of power to the traveling means. .