JPS6053362B2 - Cartridge self-propelled record player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cartridge self-propelled record player that plays a record by running a traveling body having a pickup cartridge over the 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 the record. The present invention relates to a device that automatically stops the running of the traveling body at times.

A conventional record player consists of a turntable that rotates the record, a motor that drives the turntable, a cartridge that picks up signals, etc., and its structure is complex and the shape is 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, conventionally, a self-propelled cartridge type record player has been proposed, in which a running body incorporating a cartridge and an audio reproduction means such as a speaker runs 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 forcibly pick up the running body from the top of the record by hand, or to turn off the drive power switch installed on the running body. This tedious operation often causes damage to the tone grooves and playback stylus of the record. The present invention aims to eliminate such drawbacks of the conventional art, and therefore, an object of the present invention is to provide a system in which the cartridge of the traveling body moves along the sound groove of a record. The direction of a rotary member provided with a steering function is gradually changed, and when the traveling body is in its final traveling position, the driving power source is switched off by the rotary member, so that the traveling body automatically starts traveling. To provide a novel one-tridge self-propelled record player constructed so that the traveling body can be easily and safely handled without stopping at any time.

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

In FIGS. 1 to 3, a traveling body 2 placed on a record disc 1 has a design imitating 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 inner surface of the main body of the traveling body 2, there is provided a light-operating switch 10 such as a microsinch for turning on/off the supply of power to the motor 4, and the operating piece 10a of this switch 10 rotates as described later. He is facing a free arm. When the arm is urged to rotate more than necessary, the switch 10 is opened to cut off the power supply to the motor 4. 11 is a speed changeover switch for the motor 4, and 12 is a knob for adjusting the volume, 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 cartridge 20 is rotatable in left, right, up and down directions. FIG. 5 shows the speed control circuit of the motor 4, which includes transistors 27 and 28, and a resistor 2.
9, 30, 31 and a capacitor 32 are wired on the circuit board 7, and are configured as shown in the figure by these elements, the power battery 3, the motor 4, the power switch 10, the speed selector switch 11, and the volume 8. ing.

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 running speed of the traveling body 2 is controlled. In addition, the rotation speed of the motor 4 can be changed by opening and closing a switch 11 depending on whether the record disc 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 accompaniment 2 is placed at position A on the record 1, and the playback needle 26 of the cartridge 20 is inserted into the sound groove 34.

Next, the speed changeover switch 11 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 is transmitted to the drive wheels 18 via the gear mechanism 5, so that the traveling body 2 starts running. As the cartridge 20 travels, the reproducing needle 26 of the cartridge 20 traces the sound groove 34, and the reproduced signal is amplified by an amplifier provided on the circuit board 7 and then applied to the speaker 6. In this case, the cartridge 20 not only reproduces the signal but also serves to steer the traveling body 2. That is, as the playback needle 26 traces the spiral sound groove 34, the cartridge 20, together with the arm 25, gradually rotates inward of the record 1 about the adjustment shaft 23, and as a result, 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 the regeneration needle 26 is not subjected to much stress. 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 from an angle of 01 to 02 together with the arm 25, and therefore the adjustment shaft 23 of the volume 8 has also moved toward the mounting plate 2. Via (02-01
), and the slider 33 in FIG. 5 moves downward in the figure accordingly. 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, the adjustment shaft 23 is rotated in accordance with the movement of the traveling body 2 inward, so that 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, allowing for faithful playback similar to that of a cartridge in an ordinary record player. Incidentally, in a self-propelled cartridge type player, as mentioned above, the operation of stopping the traveling body may damage the record, and the disadvantage is that it is extremely difficult to handle.

Therefore, when the playback needle 26 of the cartridge 20 reaches the end of the sound groove on the record, a mechanism for automatically stopping the playback needle 26 is absolutely necessary. In the present invention, the power switch 10 for driving the motor 4 is actuated by the arm 25 acting as a steering device, and the regeneration needle 26 of the cartridge 20 is operated by the arm 25 acting as a steering device.
When the arm 25 is guided by the endless groove following the sound groove, the arm 25 is moved at a large angle around the adjustment shaft 23, and the switch 10 is opened. 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 with a shutter may be used. In addition, a main switch 3 for manual operation of the power source is connected in series to the power switch 10.
5 is connected, the main switch 35 is provided protruding from the outside of the traveling body 2, and there is an advantage that there is no possibility of unnecessary driving of the motor other than when playing a record. As described above, the present invention provides a traveling body with a traveling means and a pickup cartridge, and when the traveling body runs over a record, the playback stylus of the pickup cartridge traces the sound groove of the record to generate a signal. is reproduced, and based on this tracing, the rotating means is gradually rotated with respect to the traveling direction of the traveling body, and when the above-mentioned tracing of the final sound groove by the above-mentioned reproducing needle is completed, the rotating means By automatically shutting off the power switch of the traveling means, the traveling body having the cartridge is automatically stopped upon detecting that the reproducing needle is guided to the endless groove of the record; Damage to the sound groove of the record and the playback stylus caused by the traveling body can be prevented.

Furthermore, the structure for obtaining such effects is simple and inexpensive, and it is highly profitable to put it on the market.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention.
The figure is a perspective view showing the playing state, Figure 2 is a cross-sectional K-plane side view, Figure 3 is a bottom view of the traveling body, Figure 4 is a schematic plan view for explaining the operation, and Figure 5 is the motor. FIG. 2 is a circuit diagram showing an example of a speed control circuit of the present invention. 1... Le cord board, 2... Running body, 4...
...Mo 7 evening, 6... Speaker, 10.
...Power switch, 18...Drive wheel, 1
9... Guide wheel, 20... Zetsukup cart cartridge, 25... Arm, 26...
・Reproduction needle, 34... sound 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 a signal, and the signal is reproduced by tracing the sound groove of the record. Initially, the rotating means is gradually rotated in the traveling direction of the traveling body, and when the reproducing needle finishes tracing the final sound groove, the rotating means turns on the power switch of the traveling means. A self-propelled cartridge type record player characterized by automatic shut-off.