JPH0132185Y2 - - Google Patents

Description

[Detailed description of the invention] This invention advances a head board supporting a magnetic head, pinch rollers, etc. in response to loading of a cassette half, and as it moves forward, the magnetic head comes into contact with the magnetic tape inside the cassette half. The present invention also relates to a mode switching device for a tape recorder having a structure in which a pinch roller is brought into pressure contact with a capstan to run a magnetic tape at a constant speed, thereby setting a so-called playback mode.

Looking at conventional tape recorders with such a structure, the head board and the pinch roller are generally configured to change the amount of movement between the high-speed feed mode such as fast forward or rewind, and the track interval detection mode. The design was difficult, and especially in high-speed feed mode, the pinch roller was moved back unnecessarily, requiring a wasteful operating force, and it lacked practicality.

The present invention was devised in view of the shortcomings of the conventional devices, and aims to keep the amount of movement of the pinch roller constant in both the fast forwarding or rewinding mode and the song interval detection mode. It is.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The attached drawings show each mode of a tape recorder equipped with an embodiment of the mode switching device according to the present invention, and FIG. 1 shows the play mode, FIG. 2 shows the fast forward mode, FIG. 3 shows the rewind mode, and FIG. The figure shows a plan view of the main part of the inter-track detection mode during fast forwarding, and FIG. 5 shows the main part of the inter-track detection mode during rewinding.

Now, in each of the above drawings, reference numerals 1 to 3 are fast forward, track interval detection, and rewind levers, and these levers are guided by guide shafts 4a and 4b protruding from the chassis (not shown) and individually move back and forth. The fast-forward lever 1 and the rewind lever 3 are suspended between the suspension hook S1 of the chassis and the springs 5 and 7, and the track detection lever 2 is suspended between the hook S2 of the chassis and the fast-forward lever 1 and the rewind lever 3. The springs 6 suspended between the two are always biased toward the forward, non-operating position.

Each of the levers 1 to 3 has an engaging piece 1a to 3a on one side edge thereof, which engages and disengages with a locking protrusion 14a of a lock plate 14, which will be described later. It has arc-shaped working surfaces 1b and 3b on the side edges.

Reference numeral 8 designates a head board having a roughly "L" shape with a magnetic head 9 on its upper surface, and is guided by guide shafts 4c, 4d, and 4e protruding from the chassis, so that it can move forward and backward in the left and right directions in the figure. The magnetic head 9 can be moved, and a spring 10 suspended between it and the hook S3 of the chassis will always keep it in the left direction in the figure, that is, in the direction in which the magnetic head 9 comes into contact with the magnetic tape T of the cassette set in the apparatus. Forced.

By a well-known mechanism, when the cassette is not set in the apparatus, the head board 8 is locked at a position (stop position) moved to the right in the figure against the spring 10, and when the cassette is not set in the apparatus. When the spring 1 is set inside, the lock is released and the spring 1 is
The magnetic head 9 is moved to the left in the figure by an applied force of 0, and is locked at the position (playback position) where the magnetic head 9 contacts the magnetic tape as described above.

Reference numeral 11 designates a pinch roller lever pivotally supported on the guide shaft 4c, which of course pivotally supports the pinch roller 11a that approaches and separates from the capstan 12, and has an engaging protrusion 11b projecting from the lower surface of one end and a hook piece for the chassis. A rotational force in the counterclockwise direction in the figure is applied by a spring 13 engaged between S4 and S4.

Reference numeral 14 denotes the lock plate which is pivotally supported on the chassis with a shaft 4f, and a locking protrusion 14a protruding from the lower surface of one end is attached to one side edge of each of the fast forward, track interval detection and rewind levers 1 to 3. The spring 1 is suspended between the chassis hook S5 so as to be in constant contact with the spring 1.
5, it is energized clockwise in the figure.

Reference numeral 16 denotes a substantially "L"-shaped first transmission lever provided between the head board 8 and the pinch roller lever 11 so as to be able to move from side to side in the figure while being guided by the guide shafts 4c and 4d. One end is provided with an engaging portion 16a that engages and disengages with the engaging protrusion 11b of the pinch lever 11, and the other end is provided with an engaging edge 16b and an engaging piece 16c.

17 is a conversion lever pivotally supported on the chassis with a shaft 4g, and a conversion pin 1 protruding from the top surface of the tip.
7a is positioned between the working surfaces 1b and 3b of the fast forward and rewind levers 1 and 3 and the engaging edge 16b, and the working surface 1b or 3b is changed by pressing the lever 1 or 3. When it hits the pin 17a, it also rotates counterclockwise in the figure to bring the conversion pin 17a into contact with the engaging edge 16b and the first
It is configured to move the transmission lever 16 rightward in the figure.

Reference numeral 18 designates a second transmission lever pivotally supported on one end of the head board 8, which is connected to the first transmission lever 1.
6 is applied with a clockwise rotational force in the figure, but when the song interval detection lever 2 is in the non-operating position, the engaging piece 18a extends to the tip. is engaged with the protrusion 2b of the song interval detection lever 2 to prevent its rotation, and when the song interval detection lever 2 is pressed and moved backward to move to the operating position, the spring 19
It is configured to rotate clockwise.

The second transmission lever 18 has a stepped hole 18b in the center of the plate surface, and the engagement piece 16c of the first transmission lever 16 is inserted into and engaged with this hole 18b. The movement of the lever 16 is transmitted to the head board 8, but when the song interval detection lever 2 is in the non-operating position and is also in the first position where it is not rotated. In this case, the lever 18 is connected to the first step 1 of the stepped hole 18b.
8b ₁ to engage with the above-mentioned engagement piece 16c and the above-mentioned first
Based on the movement of the transmission lever 16, the head board 8 in the playback position is moved back with a large stroke, and
When the lever 2 is in the pressed operating position and simultaneously in the rotated second position, the lever 18 is in the second position of the stepped hole 18b.
The step part _18b2 is engaged with the engagement piece 16c, and based on the movement of the first transmission lever 16, the head board 8 in the playback position is moved backward with a small stroke.

The difference between these strokes is the distance l between the first and second step parts, and when the head board 8 is retracted by the large stroke, it is retracted almost to the stop position, and the magnetic head 9 is completely removed from the magnetic tape. When it is moved back with a small stroke, it is moved back to an intermediate position approximately between the reproduction position and the stop position, and the magnetic head 9 is brought into light contact with the magnetic tape T.

The present invention is constructed as described above,
The effect will be explained below.

(1) Regarding the playback mode: In this mode, as shown in Fig. 1, the fast forward track detection and rewind levers 1 to 3 are in the non-operating position, while the head board 8 is in the playback position. The magnetic tape is run at a constant speed by a reel stand (not shown), a capstan 12, and a pinch roller 11a, and the magnetic head 9 comes into strong contact with the magnetic tape to reproduce information on the magnetic tape T.

(2) Regarding the fast-forward mode; This mode can be entered by pressing the fast-forward lever 1 in the above playback mode.

That is, in the playback mode, when the fast-forwarding lever 1 is pushed back from the non-operating position, the action surface 1b of the lever 1 is moved back to the conversion lever 1.
The first transmission lever 16 via the conversion pin 17a of 7
Move to the right in the figure.

This movement of the first transmission lever 16
The engaging piece 16c is the first step part 18b ₁ of the stepped hole 18b.
The head board 8 is engaged with the head board 8 via the second transmission lever 18 and against the spring 10.
starts moving with a large stroke from the playback position toward the stop position, while the lever 16
Since the engaging portion 16a is engaged with the engaging protrusion 11b of the pinch roller lever 11, the pinch roller lever 11 is rotated against the spring 13 in a direction in which the pinch roller 11a is separated from the capstan 12.

Then, as the pressing of the fast-forward lever 1 progresses, the lever 1 locks the lock plate 14 with its engaging piece 1a.
When it is locked by the locking protrusion 14a, that is, when it reaches the operation position, the head board 8 reaches the stop position and moves the magnetic head 9 away from the magnetic tape, while the pinch roller lever 11 moves towards the pinch roller 11a. is separated from the capstan 12 (see Fig. 2).

With the above, the fast forward mode is entered, and of course, in this mode, the reel stand is driven by a high speed drive mechanism (not shown), so the magnetic tape is run at high speed.

In addition, in order to return to the playback mode from this fast-forward mode, operate the operation button (not shown) and press the lock plate 1.
It is preferable to release the lock of the fast forward lever 1 by 4.

That is, when the fast-forward lever 1 is unlocked by the lock plate 14, the lever 1 returns from the operating position to the non-operating position by the return force of the spring 5.
6 is no longer supported, and therefore spring 1
The return force of 0 returns the head board 8 from the stop position to the playback position and moves the magnetic head 9 towards the magnetic tape T.
At the same time, the pinch roller lever 11 is rotated back by the spring 13, and the pinch roller 11a is brought into elastic contact with the capstan 12 to enter the reproducing mode shown in FIG.

(3) Regarding the rewind mode; This mode can be entered by pressing the rewind lever 3 in the playback mode, but in this case, the first transmission lever 16 is activated by pressing the rewind lever 3. Except for being moved to the right in the figure by the action surface 3b of the lever 3 via the conversion pin 17a of the conversion lever 17, this is almost the same as the case of mode conversion to the above-mentioned fast forward mode, so a detailed explanation of the mode switching will be omitted for convenience. . Note that this rewind mode is as shown in FIG.

Of course, in order to return from the rewind mode to the playback mode, the rewind lever 3 is unlocked by the lock plate 14 by operating the operation button (not shown) in the same way as from the fast forward mode, and the rewind lever 3 is unlocked by the lock plate 14.
This can be carried out by releasing the support provided by the working surface 3b.

(4) About the song interval detection mode in fast forward; This mode can be shifted to by simultaneously pressing the fast forward lever 1 and the song interval detection lever 2 in the above playback mode.

That is, in the above playback mode, when both the fast forward and song interval detection levers 1 and 2 are pressed from their non-operating positions and moved back at the same time, in the process of these levers 1 and 2 moving back, the song interval detection lever 2 is first pressed. When the lever 2 retreats, the protrusion 2b of the lever 2 moves in the direction of disengaging from the engagement piece 18a of the second transmission lever 18, and the second transmission lever 18 is rotated clockwise in the figure by the biasing force of the spring 19. The second step portion 18b ₂ of the stepped hole 18 of the second transmission lever 18 is made to face the engagement piece 16c, and immediately after that, the action surface 1b of the fast-forwarding lever 1 is moved to the first step via the conversion pin 17a of the conversion lever. 1 transmission lever 16
Move to the right in the figure.

As described above, this movement of the first transmission lever 16 moves the head board 8 from the playback position toward the stop position via the second transmission lever 18, with the second step portion _18b2 facing the engagement piece 16c. While starting the movement with a small stroke, the engaging portion 16a of the lever 16 engages the engaging protrusion 1 of the pinch roller lever 11.
The pinch roller lever 1 is engaged with the lever 1b.
1 is rotated in a direction in which the pinch roller 11a is separated from the capstan 12 against a spring.

Then, the pressing of the fast forward and song interval detection levers 1 and 2 progresses, and these levers move to the respective engagement pieces 1.
a and 2a to lock the locking protrusion 14 of the lock plate 14.
When the magnetic head 9 is locked in position a, that is, the operation position is reached, the head board 8 reaches an intermediate position between the playback position and the stop position, and brings the magnetic head 9 into light contact with the magnetic tape T, while the pinch roller The lever 11 moves the pinch roller 11a away from the capstan 12 (see FIG. 4).

With the above, the mode has become the inter-track detection mode in the fast forward mode. In this mode, the reel stand is driven by a high-speed drive mechanism, so the magnetic tape runs at high speed, and the magnetic head 9 is connected to the magnetic tape running at high speed. The so-called inter-musical portion is searched from T.

In this mode, when the magnetic head 9 detects a song interval on the magnetic tape T, the lock plate 1
4 to release the lock of the fast forward and track interval detection levers 1 and 2 by the lock plate 14, and return the tape recorder to the playback mode again.

That is, when the levers 1 and 2 are unlocked by the lock plate 14, the levers 1 and 2 return from the operating position to the non-operating position by the return forces of the springs 5 and 6, respectively. The supporting force of the operating surface 1b on the first transmission lever 16 is eliminated, and the head board 8 returns from the intermediate position to the playback position by the restoring force of the spring 10, bringing the magnetic head 9 into strong contact with the magnetic tape T. In addition to this, the pinch roller lever 11
is rotated back by the spring 13, the pinch roller 11a is brought into elastic contact with the capstan 12, and the mode returns to the play mode shown in FIG.

Of course, at this time, as the song interval detection lever 2 returns to the non-operating position, the protrusion 2b of the lever 2 moves to the second position.
The lever 18 is rotated counterclockwise against the engagement piece 18a of the transmission lever 18 against the spring 19, and the first step 1 of the stepped hole 18b is rotated as shown in FIG.
_8b1 to face the engagement piece 16a.

(5) About the song interval detection mode during rewinding; You can shift to this mode by pressing the rewind lever 3 and the song interval detection lever 2 at the same time in the above playback mode, but in this case, the rewind lever 3, the first transmission lever 16 is moved to the right in the figure by the action surface 3b of the lever 3 via the conversion pin 17a. The detailed explanation of the mode switching will be omitted for the sake of convenience, since the difference is almost the same as the case. Note that the song interval detection mode during this rewinding is as shown in FIG.

Of course, since the case of detecting a song interval from this mode and returning to the playback mode again is the same as the case of returning to the playback mode from the song interval detection mode in fast forwarding, a detailed explanation will be omitted.

In the present invention, the pin roller lever always moves within a certain range and approaches and separates from the capstan, even though the amount of movement of the head board changes between the track detection mode and the high-speed feed mode. Therefore, it is possible to provide an extremely convenient mode switching device without the troublesome design of changing the amount of movement of the pinch roller for each mode as in the prior art.

[Brief explanation of the drawing]

The attached drawings show each mode of a tape recorder equipped with an embodiment of the mode switching device according to the present invention, and FIG. 1 shows the playback mode, FIG. 2 shows the fast forward mode, and FIG. 3 shows the rewind mode and the tape recorder. FIG. 4 is a plan view of the main part of the inter-track detection mode during fast forwarding, and FIG. 5 is a plan view of the main part of the inter-track detection mode during rewinding. 1: Fast forward lever, 2: Song interval detection lever, 3:
Rewind lever, 8: head board, 9: magnetic head, 11: pinch roller lever, 11a: pinch roller, 12: capstan, 16: first transmission lever, 18: second transmission lever.

Claims (1)

[Scope of utility model registration request] The magnetic head is moved back and forth so as to take a playback position where the magnetic head is in strong contact with the magnetic tape, a stop position where the magnetic head is separated from the magnetic tape, and an intermediate position between the playback position and the stop position where the magnetic head is in light contact with the magnetic tape. a head board that can reciprocate, a pinch roller means that can move independently of the head board and that can move toward and away from the capstan, a high-speed feed lever means that can take a non-operating position and an operating position, and a track interval detection lever. and a first transmission lever means that reciprocates in response to the operation of the high-speed feed lever means, and that reciprocating movement moves the pinch roller means within a certain range toward and away from the capstan; Depending on whether or not the song interval detection lever means is pressed, the first transmission lever means can be engaged in different states, and depending on the engaged state, the first transmission lever means can be moved by different amounts of movement. A mode switching device for a tape recorder, comprising a second transmission lever means for transmitting a signal to a head board.