JPS5813469Y2 - automatic stop device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an automatic stop of a tape recorder, and particularly relates to a so-called full automatic shut-off which is activated at each lock of recording, playback, rewinding, etc.

Conventionally, in order to operate an auto-shutoff, it is necessary to detect the tape tension with a separate detector, to transmit several types of levers from the take-up reel shaft, which is also displaced by the tape tension, or to stop the reel shaft. was detected electrically and activated an automatic stop device, but each required a complex mechanism and a large number of different parts.

Moreover, in many cases, the device was a so-called semi-automatic yarn-off device that operated only during winding.

The present invention has been devised to eliminate these drawbacks, and aims to provide a tape recorder equipped with a so-called fully automatic shut-off device using a simple mechanism.

The present invention will be explained in detail below with reference to embodiments shown in the drawings.

Figure 1 is a diagram showing the positional relationship and rotational direction of each main part during so-called forward feeding during recording or playback. 1 is a flywheel, and a capstan is fixed to the flywheel 1 through a capstan shaft 2. A gear 3, an idler 6 that transmits the rotational force of the capstan gear 30 to the take-up gear 4 and the supply gear 5, an idler lever 7 that rotatably supports the idler 6 and is swingable; This is an intermediate wheel 8 for reversing the rotation direction of the wheel 6.

Although the above configuration is already known, the present invention further includes a reset mechanism that is swingably supported by a pin 9 on a chassis (not shown) that swings due to tape tension as the tape ends. A lever 10, a reset wheel 11 that is pivotally supported by the reset lever 10 and is always rotated by the winding gear 4, and an impeller 12 that is coaxially fixed to the reset wheel 11. A spring 13, which normally acts to pull the reset lever 10 away from the supply gear and position the take-up gear in a fixed position, and a chassis (not shown) that receives the rotational force of the impeller 12, can swing. A lock release lever 14 is provided.

Now, to explain the automatic stop during tape playback, as shown in FIG. 2, the tension caused by the end of the tape becomes Fl, swinging the reset lever 10, and supplying the reset wheel 11 that is pivotally supported by the reset lever 10. This becomes the force that presses the gear 5.

On the other hand, it is well known that the 40 rotations of the winding gear is capable of slipping in order to absorb the difference in rotation speed with the capstan shaft 2. In this case, even when the tape is finished, the motor (not shown) continues to rotate. The force will be transmitted sequentially from fl to f6.

At this time, the supply gear 5, like the take-up gear 4, must also have a slip type structure that does not stop the tape.

As described above, when the reset lever 10 is displaced and the reset wheel 11 is rotating in the direction of f4, the impeller 12 will also rotate in the direction of f4, causing the lock release lever 14 to swing in the direction of F2. Become.

This force F2 becomes F3+F4, which operates the playback lock lever 16 that locks the playback button 15 and releases the lock.

The automatic stop during remand will be explained with reference to FIGS. 3 and 4. The difference from that during regeneration is that the idler wheel 6 is pressed against the intermediate wheel 8 and the rotation transmission is f1+f2. The tape is rewound by being transmitted in the order of f7+f8.

When the tape ends, a force with a playback time F1 acts on the reset lever 10, displacing the take-up gear 4 and the reset wheel 11, and a rotational force f8 is transmitted to the reset wheel 11, fg.
It becomes yf100 rotational force.

The rotational force f9 causes the impeller 12 rotating integrally with the reset wheel 11 to rotate in the same direction, and the acting force F6 causes the lock release lever 14 to swing.

One member of the lock release lever 14 is F7, which presses and swings the rewind lock lever 18 that locks the rewind lever 17 to release the lock.

As described above, the present invention includes a reset lever that is displaced by the tension of the tape, and a reset wheel and an impeller provided at one end of the reset lever that swing the lock release lever using the rotational force of the reset lever and the playback and rewind lock levers. Since - is removed, it is possible to provide an automatic stop device that operates reliably and is useful for tape recorders with a small number of parts.

[Brief explanation of drawings]

Fig. 1 is a schematic plan view of the embodiment of the present invention in the forward direction recording and playback state, and Fig. 2 is a schematic plan view showing the paths through which the reset lever is displaced at the end of the tape and each acting force is transmitted to the lock lever. 3 is a schematic plan view showing the reverse feed state, and FIG. 4 is a schematic plan view showing the paths through which the reset lever is displaced when the tape ends and each acting force is transmitted to the rewind lock lever. 4... Winding gear, 5... Supply gear, 1
0... Reset lever 11... Reset wheel, 12... Impeller, 14... Lock release lever, 16... Regeneration lock lever 1
8... Rewind lock lever.

Claims (1)

[Scope of utility model registration request] In a device having a take-up gear that is displaced by tension at the end of the tape, a reset lever is rotatably supported at least on a chassis and rotatably supports the take-up gear and a reset wheel that is always driven by the take-up gear. It is equipped with an impeller that rotates in unison with the reset wheel, and a lock release lever that is swingably supported on the chassis.The reset lever displaces when tension is applied to the tape at the end of the tape, and when the tape is played, the winding is stopped. A reset wheel receives the rotational force of the gear, or receives the rotational force of the supply gear when rewinding the tape, and an impeller that rotates together with the reset wheel presses and swings a part of the lock release lever, and the other part An automatic stop device characterized by releasing the regeneration or remand lock device.