JPH0135302Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an auto-stop mechanism in a cassette tape recorder in which the auto-stop function is disabled when the stop state is a pause state.

Various types of auto-stop mechanisms have been developed, including electrical and mechanical types. An example of a mechanical auto-stop mechanism is shown in FIG. In the figure, 1 is a reel stand, 2 is a rotary plate that rotates together with the reel stand 1, and 3 is a pulley with two upper and lower stages connected to the rotary plate 2 by a belt 4, which is installed in a chassis (not shown). It is supported by a shaft 3a. In addition, the pulley 3 has a belt 4 on the lower side.
is wound, and the upper side is rotated through appropriate friction. 5 is a guide hole 5a with a long hole in the center.
However, the control lever is formed with an engaging protrusion 5b on the lower surface of the tip and an engaging piece 5c on the lower surface of the rear end, and the guide pin 3b formed on the above-mentioned upper pulley 3 is inserted into the guide hole 5a. ing. Reference numeral 6 designates a connecting lever whose approximately central portion is pivotally supported by the shaft shaft 6a of the chassis, and one end of which is connected to the guide hole 5 of the control lever 5 described above.
It is pivotally supported approximately midway between a and the engaging piece 5c. Further, a spring 7 is provided between the connecting lever 6 and the chassis to apply a spring force to the lever 6 in a counterclockwise direction. Reference numeral 8 designates a stop lever for unlocking an operation button, which has an elongated guide hole 8b inserted into the chassis shaft 8a, and its upper end is pivotally supported by the other end of the connection lever 6 mentioned above. Reference numeral 9 designates a camshaft that rotates together with the capstan shaft, and a funnel-shaped guide piece 9a is formed at a position that sandwiches the engagement protrusion 5b of the control lever 5, and a center position of the widest part of the funnel-shaped guide piece 9a. A hooking protrusion 9b is formed on. Reference numeral 10 is a release plate that moves when a stop operation or a pause operation is performed and operates a brake plate (not shown) that applies a brake to the reel stand 1, and has an upright piece 10a formed at one end thereof. Reference numeral 11 denotes a coiled spring pivotally supported by the shaft 11a of the chassis, one end of which abuts against the upright piece 10a of the release plate 10, and the other end abuts against the engagement piece 5c of the control lever 5.

Next, the operation will be explained based on the above configuration.

Now, when the operating state is play, rewind, or fast forward, the reel stand 1 rotates to the right or left, so the pulley 3 is also rotated to the right or left via the belt 4. When the pulley 3 is rotated, the guide pin 3b is guided to the guide hole 5a of the control lever 5, so that the control lever 5 pivots at the pivot point with the connecting lever 6, and the engaging protrusion 5b moves to the guide piece 9a. It is swung to the right or left until it touches one of the And the engaging protrusion 5b is the guide piece 9a.
When the control lever 5 comes into contact with the control lever 5, the rotation of the control lever 5 is stopped, and therefore the rotation of the pulley 3 on the upper stage side is also stopped. Therefore, the lower pulley slides relative to the upper pulley.

On the other hand, as the power is turned on and the drive shaft of the capstan rotates, the camshaft 9 also rotates, but here, the engagement protrusion 5b remains in contact with one of the guide pieces 9a, so the engagement protrusion 5b remains in contact with one of the guide pieces 9a. The mating protrusion 5b is not engaged with the hooking protrusion 9b, so the control lever 5 is not pulled upward and the stop lever 8 is not pulled up, the reel stand 1 continues to rotate, and the above operating state is maintained. It is carried out continuously.

By the way, in the above-mentioned operating state, when the tape is wound and the reel stand 1 stops, the rotational force of the pulley 5 disappears, so that the biasing force on the control lever 5 disappears. This causes the guide piece 9 to rotate as the camshaft 9 rotates.
Since the engaging protrusion 5b is located in the middle between the guide pieces 9a at the narrowest part between the gaps 9a and 9a, the further rotation of the camshaft 9 brings the hooking protrusion 9b into contact with the engaging protrusion 5b, and the engaging protrusion 5b Press down. Therefore, the control lever 5 is pushed down to rotate the connecting plate 6 clockwise about the shaft 6a, and the stop lever 8 is pulled up. As a result, the stop operation button is operated and the play, rewind, and fast forward operations are stopped, and the release plate 10 is moved to operate the brake plate and apply the brakes to the reel stand 1.

When the release plate 10 moves, the upright piece 10a presses one end of the coiled spring 11, and the other end of the coiled spring 11 presses the engagement piece 5c of the control lever 5. As a result, the control lever 5 is moved to the connecting lever 6.
It is rotated clockwise using the pivot point as the fulcrum.
Therefore, the engaging protrusion 5b is brought into contact with the guide piece 9a. In order to prevent the auto-stop from working even when performing a pause operation during play or recording, the release plate 10 must be moved to close the engagement protrusion 5.
b is brought into contact with the guide piece 9a.

Even in the above-mentioned stop state and pause state, the camshaft 9 continues to rotate while the power is on, so the control lever 5 swings in the left-right direction as the camshaft 9 rotates (the engagement protrusion 5b 9a
). With this oscillation, pulley 3
is rotated in the left-right direction, and the rotational force is applied to the belt 4,
It is transmitted to the reel stand 1 via the rotating plate 2.

When stopping, the brake is applied to the reel stand 1, but if the braking force is weak, or some tape recorders have a structure in which the brake does not apply. In a pause state in which the brake is not applied, the reel stand 1 rotates left and right due to the rotation of the pulley 3. Therefore, when the amount of tape wound on the reel stand 1 is large, the tape may be wound little by little, and if the above condition continues for a long time, the tape will move, which is a disadvantage. However, when the reel stand is on the supply side, a large amount of tape slackens, and as a result, when the brake or the like is restarted, the tape winds up on the capstan shaft. Furthermore, since the reel was constantly moving when the power was turned on, the appearance was also unfavorable.

The present invention was developed in view of the above points, and its purpose is to prevent the reel stand from rotating left and right in the stop and pause states, thereby correcting the above-mentioned drawbacks of the conventional technology. To provide an auto-stop mechanism for a tape recorder.

Next, an embodiment of the present invention will be described with reference to FIGS. 2 to 5. Note that the same symbols as in FIG. 1 indicate the same members,
Explanation will be omitted.

The difference between the conventional example shown in FIG. 1 and the embodiment of the present invention is that the guide hole 5a of the control lever 5 is extended below the guide pin 3b, and the connecting lever 6
The small hole pivotally supported by the shaft 6a is made into an arc-shaped guide hole 6a, and the upright piece 10a of the release plate 10 is arranged at the lower end of the control lever 5, and the release plate 10 is fixed when stopped or paused. The only difference is that an upright piece 10a pushes up the lower end of the control lever 5.

Next, the operation of the present invention will be described. The auto-stop operation in normal play, rewind, and fast forward states is the same as that of the conventional structure described above, and the explanation will be omitted.

When the stop lever 8 is pulled up and a stop operation is performed, the release plate 10 moves and the upright piece 10a pushes up the control lever 5. In addition, even in the pause state, the release plate 10
moves and pushes up the control lever 5 (4th and 5th
figure). As a result, the engaging protrusion 5b of the control lever 5 deviates from the trajectory of the hooking protrusion 9b, that is, as shown in FIG.
The control lever 5 is moved to a position where it does not come into contact with either the hook projection 9b or the hook projection 9b.

Therefore, even if the camshaft 9 rotates, the engaging protrusion 5b is not engaged with the hooking protrusion 9b in the stopped state and the pause state, and the engaging protrusion 5b is not in contact with the guide piece 9a, so that the camshaft 9 is not in the stopped state in the pause state. Also, since the control lever 5 is not swung, the reel stand 1 is not rotated from side to side.

As described above, the present invention moves the control lever, which swings as the camshaft rotates and moves vertically when the reel stand stops, from the trajectory of the camshaft's guide piece and hook protrusion during the stop and pause states. Since it is removed, the control lever can be prevented from swinging during stop and pause, and the reel table can be prevented from rotating from side to side.

[Brief explanation of drawings]

Fig. 1 is a plan view of main parts showing an example of an auto-stop mechanism of a conventional tape recorder;
The figures show one embodiment of the auto-stop mechanism according to the present invention, Fig. 2 is a plan view of the main part immediately before the reel stand stops, Fig. 3 is a sectional view of the same, and Fig. 4 is the main part of the reel stand in the stop or pause state. FIG. 5 is a sectional view of the same. 1... Reel stand, 5... Control lever, 5b...
Engagement protrusion, 9...Camshaft, 9a...Guide piece, 9
b...Latching protrusion, 10...Release plate.

Claims (1)

[Scope of utility model registration request] A camshaft has a hooking protrusion in the center and funnel-shaped guide pieces on both sides thereof, and a biasing force is applied by the rotation of the reel stand so that the engagement protrusion comes into contact with the guide piece and the biasing force is generated by the reel stand. A control lever whose engaging protrusion engages with the hooking protrusion and moves to the stop state when the lever disappears, and a control lever which moves during the stop or pause state to connect the engaging protrusion of the control lever to the guide piece and the hooking protrusion. An auto-stop mechanism for a tape recorder, comprising a release plate that is moved so as not to come into contact with the tape recorder.