JPS6331212Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a cassette tape recorder device, and particularly to one having an auto-reverse function, in which the position of the head is defined to ensure good recording and playback.

As is well known, a tape recorder that enables reciprocating recording or playback is called an auto-reverse device. In other words, this auto-reverse device can automatically record or play back during the reverse operation without changing the tape loading state or operation section setting state at the end of the tape during the forward operation, making it possible to record or play for long periods of time. This is particularly useful when regeneration is required.

However, such an auto-reverse device is still in the development stage and has various points to be improved. For example, the recording/playback head of a tape recorder that uses the auto-reverse device described above naturally runs the tape at an accurate azimuth angle in order to enable playback (recording) in the forward and reverse directions of tape running, that is, in forward and backward motions. The head must be moved so that it can come into contact with the corresponding track of the tape depending on the direction, but conventionally the recording/playback head is moved in a direction approximately perpendicular to the longitudinal direction of the tape. Therefore, it is necessary to provide sufficient space within the tape recorder mechanism to move the recording/reproducing head, which poses a problem of increasing the size of the tape recorder itself.

Therefore, it has been necessary to develop an auto-reverse device equipped with a recording/playback head moving mechanism that does not waste space within the tape recorder mechanism, is easy to assemble, and does not cause deterioration in recording and playback characteristics. Highly desired.

This idea was made in consideration of the above circumstances, and by positioning the center of the recording/reproducing head slightly offset from the center of the cassette half in the tape running direction when the tape is running in the forward and reverse directions in auto-reverse, It is an object of the present invention to provide an extremely good cassette tape recorder device capable of compensating for rattling of a tape pad and performing stable recording and playback.

Hereinafter, one embodiment of this invention will be described in detail with reference to the drawings. That is, Figures 1 and 2
In the figure, reference numeral 11 denotes a substantially box-shaped main chassis of a compact cassette tape recorder, and various mechanisms described later are installed at the front and rear, upper and lower, and right and left sides of the main chassis. The operation section 12 is provided to protrude forward from the lower end of the main chassis 11 in FIG. 1, and from the left end in FIG. child 122, PLAY (R) operator 123 for reverse direction (backwards movement) playback, REC operator 124 for recording, PLAY for forward direction (forward movement) playback
(F) Operator 125, FF operator 12 for fast forwarding
6. PAUSE operator 12 for pause
7 are arranged so that they can be pressed in the direction of arrow A in a piano-touch manner and can be returned in the direction of arrow B, and each of these operators 121 to 127 controls each drive system via an operation lever (not shown). It is designed so that it can be put into a driving state. In this case, each of the operating levers is arranged so as to be able to reciprocate in the vertical direction in the figure on the back side of the bottom plane part 111 of the main chassis 11 in FIG. The push-in state is locked by a pressing operation. However, the operating lever of the STOP operating element 121 is not locked, but engages with the locking mechanism so as to release the operating levers of the other operating elements that are in the locked state. Furthermore, the operating lever of the PAUSE operator 127 operates independently without any engagement with the lock mechanism, and is connected to the main chassis 11.
It engages with a known push mechanism (not shown) disposed on the back side of the bottom-like flat part 111 in FIG. At the same time, a second pressing operation releases the locked state and returns to, for example, a reproducing state.

And the above REW and FF operators 122, 12
Each operating lever 6 functions to selectively drive a forward/reverse switching mechanism of a high speed feed system (not shown) to cause the tape to run at high speed in the forward or reverse direction. In addition, the PLAY (R) and PLAY (F) operators 12
Each of the operating levers 3 and 125 selectively drives a forward/reverse switching mechanism of a constant speed feed system, which will be described later, to cause the tape to run at a constant speed in the forward or reverse direction.
The head slider 13, which is slidable back and forth in the directions of arrows C and D in the figure, is driven to bring the recording/reproducing head 14, etc. mounted on the head slider 13 into contact with a predetermined surface of the tape, and the same pair of pinch rollers are used. 15, 16
By selectively bringing it into contact with the pair of capstans 17 and 18, it functions to be in a reproducing state in the forward or reverse direction. Here, the upper recording head 1
4, in order to enable playback (recording) in the forward and reverse directions of tape running, i.e. forward and backward movements, the azimuth angle is of course accurate and the tape is moved so that it can come into contact with the corresponding track of the tape according to the tape running direction. The structure and operation of this head moving mechanism 100 will be described in detail later.

By the way, with a normal tape recorder, it is only necessary to play back (record) in the forward direction, so of course one
The PLAY control may be used, but since the tape recorder that is used here that enables auto-reverse requires playback (recording) in both forward and reverse directions, two independent controls for forward and reverse directions are required.
It is equipped with a PLAY operator. here,
When only one of the two PLAY controls is operated, playback (recording) is possible only in that direction, and when both are operated at the same time, so-called auto-reverse is possible, and normal playback (recording) is possible. In this case, you only need to operate the PLAY operator in the forward direction.

In addition, the REC operator 124 in the center of the figure can be operated in combination with the PLAY operator described above to enable recording in only one direction, forward or reverse, or reciprocating recording by auto-reverse. It drives the system.

Furthermore, protruding from the center of the main chassis 11 in FIG. 1 are a left reel stand 19 and a right reel stand 20, each of which is connected to an automatic stop mechanism, a reciprocating operation switching mechanism, and the like. In addition, above the main chassis 11 in FIG. 1, there is a right reel stand 20.
A tape counter 21 connected to the motor 22 that serves as a power source for each drive system, and an operating lever 2 for the auto-reverse number limiting mechanism and manual reverse mechanism.
3 and 24 are installed.

Here, FIG. 3 shows the forward/reverse switching mechanism of the tape constant speed feeding system taken out from FIGS. 1 and 2 above. That is, what is indicated by a dotted line in the figure is the head slider 13, which is shown in a simplified manner from that shown in FIG. 1 for the sake of simplicity. This head slider 13 has a pair of protrusions 131 and 132 formed at predetermined positions on both sides thereof. Each of the protrusions 131 and 132 of the head slider 13 is formed in the center of each of the left and right playback sliders 25 and 26, which are arranged in parallel on the lower surface of the head slider 13 and are indicated by two-dot chain lines in the figure. Hole 2
Engagement piece 25 formed at the bottom in the figure of 51, 261
2,262. Here, the left and right playback sliders 25, 26 have a pair of elongated holes 253, 254 and 26 formed therein.
3,264, guide pins 255, 256 and 265, 26 formed on the main chassis 11;
6 are inserted through the head slider 13, so that the head slider 13 is supported so as to be able to reciprocate in the directions of arrows C and D in the figure.

And the left and right playback sliders 25 and 26
is the PLAY(R) and PLAY(F) operator 12.
3,125 operating levers and are interlocked via springs (not shown).
PLAY (R) and PLAY (F) operators 123, 12
5, each is biased in the direction of arrow C in the figure. Further, the left and right playback sliders 25 and 26 control idlers, gears, etc. (not shown) for transmitting the rotations of the pinch rollers 15 and 16 and the motor 22 to the left and right reel stands 19 and 20, respectively. It is something to do. That is, when the left playback slider 25 is slid in the direction of the arrow C in the figure, it presses the pinch roller 15 against the capstan 17 (see FIG. 1), rotates the left reel stand 19, and winds the tape. Then, the tape is played back in the reverse direction. Further, when the right playback slider 26 is slid in the direction of arrow C in the figure, the pinch roller 16 is moved to the capstan 18.
(See FIG. 1), the right reel stand 20 is rotated to wind the tape, and playback is performed with the tape running in the forward direction. In other words, whether the tape runs in the forward direction or in the reverse direction is determined by the right and left playback sliders 26,
25 is determined by which one is moved in the direction of arrow C in FIG.

Here, a tapered locking portion 257 is formed on the upper right side of the left playback slider 25 in the drawing. Furthermore, a locking portion 267 formed by a substantially concave notch is formed at the substantially central portion of the upper end of the right playback slider 26 in the drawing. A substantially T-shaped reverse drive lever 27 is rotatably supported on a shaft 112 protruding from the main chassis 11 on the lower surfaces of the left and right playback sliders 25 and 26.
is provided. This reverse drive lever 27
On the left side of the base 271 in the figure, there is a bent engagement piece 27 that engages with the locking part 257 of the left playback slider 25.
2 is formed. Further, a bent engagement piece 273 that engages with the locking portion 267 of the right playback slider 26 is formed on the left side of the base 271 of the reverse drive lever 27 in the drawing. Furthermore, a substantially crank-shaped elongated hole 274 is formed on the left side of the base 271 of the reverse drive lever 27 in the drawing.

The elongated hole 2 of the reverse drive lever 27
A protrusion 281 protruding from one side of a gear 28 rotatably supported by a shaft 113 protruding from the main chassis 11 is fitted into the interior of the gear 74 . Therefore, when the gear 28 rotates, the reverse drive lever 27 can swing around the shaft 112 in response to the rotation. Here, on the other side of the gear 28 opposite to the side on which the protrusion 281 is provided, there is a pair of locks that bite into a lock lever 29, which will be described later, when the gear 28 rotates clockwise in the figure. Locking part 28
2,283 are formed. This locking part 28
2 and 283 are formed at opposing positions with the axis 113 as the center. Further, the lock lever 29 is rotatably supported by a shaft 114 protruding from the main chassis 11, and is an engagement piece that can be selectively engaged with and disengaged from the locking portions 282 and 283 of the gear 28. 291 is formed.
The lock lever 29 is normally biased by the action of a spring (not shown) in a direction in which its engaging portion 291 engages with the locking portions 282, 283 of the gear 28, that is, counterclockwise in the figure. Further, this lock lever 29 is used when detecting the end of the tape when switching the reciprocating operation mentioned above (this may be the same as detecting the end of the tape in the automatic stop mechanism) or when operating the operating lever 24 of the manual reverse mechanism (see Fig. 1). The engaging portion 291 is disengaged from the locking portions 282 and 283 of the gear 28 by being rotated clockwise in FIG. 3 against the biasing force of the spring.

On the other hand, a first gear (not shown) is always meshed with the gear 28. This first gear and gear 2
The gear ratio with respect to the first gear 8 is set at 1:2, and when the first gear rotates once, the gear 28 rotates half a rotation. The first gear is formed with a notch portion without a gear at a predetermined position, and the rotational force from the motor 22 is transmitted to the position opposite to this notch portion to allow the tape to run. A second gear is provided which rotates in one direction regardless of the rotation speed. When the second gear is meshed with the first gear, it is rotated to rotate the gear 28 clockwise in the figure.

In the above configuration, assuming auto-reverse, the PLAY(R) and PLAY
(F) Assume that both operators 123 and 125 are operated. Then, the left and right playback sliders 25,
26 are both slid in the direction of arrow C in FIG. Here, as shown in FIG.
3, the reverse drive lever 27 is restricted to the illustrated position depending on the position of the protrusion 281. Therefore, the right playback slider 26 is moved sufficiently in the direction of arrow C, but the locking portion 257 of the left playback slider 25 comes into contact with the bent engagement piece 272 of the reverse drive lever 27, and the left playback slider 25 is moved sufficiently in the direction of arrow C. not moved in the direction. Therefore, the pinch roller 16, idler, etc. controlled by the right playback slider 26 are pressed against the capstan 18 or moved to a predetermined position for rotating the right reel stand 20, so that the right reel stand 20 is rotated. It is something that is regenerated. At this time, the right playback slider 26
As the engaging piece 262 moves in the direction of arrow C, the engaging piece 262
comes into contact with the protrusion 132 of the head slider 13, and moves the head slider 13 in the direction of arrow C.
For this reason, a recording/reproducing head 14 (see FIG. 1), the details of which will be described later, provided on the head slider 13 is brought into contact with the tape. Also, at this time, since the reverse drive lever 27 is holding down the left playback slider 25 being biased in the direction of arrow C, a rotational biasing force is applied to the reverse drive lever 27 in the clockwise direction in the figure. This means that the Therefore, the gear 28 having the protrusion 281 that is fitted into the elongated hole 274 of the reverse drive lever 27 is also given a rotation biasing force in the clockwise direction in the figure, but the locking portion 283 is not attached to the lock lever. 29, the gear 28 does not rotate and the reverse drive lever 27 remains stable at the position shown in FIG.

Assume that the tape reaches the end in the forward playback state as described above. Then, as shown in FIG. 4, the tape end detection mechanism described above detects
The lock lever 29 is rotated clockwise in the drawing, and its engaging portion 291 is disengaged from the locking portion 283 of the gear 28. At this time, as mentioned earlier, in the state shown in FIG. 3, the gear 28 is given a rotation biasing force in the clockwise direction in the figure, so the gear 28 is slightly rotated in the clockwise direction in FIG. . Then, this gear 2
The first gear meshed with gear 8 is slightly rotated in the opposite direction to gear 28. Therefore, the first gear and the second gear are brought into meshing state, and the gear 28 is rotated clockwise in the figure by the rotational force of the second gear.

When the first gear rotates once and its notch again faces the second gear, the gear 28 rotates exactly half a turn and the locking portion 282 is the engaging portion 291 of the lock lever 29
is locked. At this time, the reverse drive lever 27 is rotated clockwise in FIG. 5 following the protrusion 281 as the gear 28 rotates half a turn. Therefore, the bent engagement piece 2 of the reverse drive lever 27
73 comes into contact with the locking portion 267 of the right playback slider 26, and the right playback slider 26 is moved backward in the direction of arrow D in the figure. On the other hand, the left playback slider 25 has a reverse drive lever 2 relative to its locking portion 257.
Since the locking of the bent engagement piece 272 of No. 7 is released,
It is moved sufficiently in the direction of arrow C. Therefore, the pinch roller 15, idler, etc. controlled by the left playback slider 25 are pressed against the capstan 17 or moved to a predetermined position for rotating the left reel stand 19, and are then moved in the opposite direction. The regeneration is performed. At this time, as the left playback slider 25 moves in the direction of arrow C, the engagement piece 2
52 comes into contact with the protrusion 131 of the head slider 13, and moves the head slider 13 in the direction of arrow C. Therefore, the recording/reproducing head 14 provided on the head slider 13 comes into contact with the tape.

Here, the head slider 13 is moved once backward in the direction of arrow D during the process in which the tape is switched from a forward playback state to a reverse playback state (the same applies to the reverse process) by a mechanism to be described later. then press the left or right playback slider 2
As 5 or 26 is moved in the direction of arrow C, it is moved in the same direction.

In addition, in the state shown in FIG. 5, the reverse drive lever 27 is pressing down on the right playback slider 26 being biased in the direction of arrow C, so that the reverse drive lever 27 is biased in the counterclockwise direction in the figure. This means that a rotational biasing force is applied. For this reason, the gear 28 is given a rotation biasing force in the clockwise direction in the drawing, but since its locking portion 282 is engaged with the engaging portion 291 of the lock lever 29, the gear 28 is prevented from rotating. Zu reverse drive lever 27
is stable at the position shown in FIG.

When the tape reaches the end in the reverse playback state as described above, the tape end detection mechanism activates the lock lever 29 as described above.
is rotated clockwise in the figure, the gear 28 is rotated half a turn clockwise in the figure in substantially the same manner as described above, and the tape is again played back in the forward direction as shown in FIG. In addition, the tape forward/reverse switching mechanism described above is not limited to operating only at the end of the tape.
It is easily understood from the above explanation that the manual reverse mechanism operates when the operating lever 24 is operated, and the tape running direction can be switched between forward and reverse at any point in the tape running.

The mechanism for switching between forward and reverse tape travel has been described above. Next, the head moving mechanism 100 (see FIG. 1) will be described. That is, as shown in FIG. 3 again, a bent engagement piece 276 is formed at the tip of the extension 275 of the reverse drive lever 27, which is formed in a substantially T-shape.
The guide pins 256, 266 are inserted through the left and right playback sliders 25, 26 and the main chassis 11, and are guided through the oblong holes 301, 302 and 311, which are formed at both ends of the control slider 30 and the drive slider 31, which are overlapped with each other, between the left and right playback sliders 25, 26 and the main chassis 11.
The control slider 30 and the drive slider 31 are respectively connected to the left and right playback sliders 25 and 26.
6, that is, in the directions of the arrows E and F in the figure.

Here, a through hole 303 having the shape shown in the figure is formed approximately at the center of the control slider 30. A substantially concave fitting part 304 is formed in the lower part of the through hole 303 in the drawing, into which a driven part of a fan-shaped gear provided in a head rotation mechanism, which will be described later, is fitted. A pair of locking portions 305 and 306 are formed on the right side of the fitting portion 304 in the through hole 303 at a predetermined interval in the longitudinal direction of the control slider 30.

On the other hand, approximately at the center of the drive slider 31, there is a
A through hole 313 having the shape shown is formed. A substantially mountain-shaped protrusion 314 having tapers on both sides is formed at the upper part of the through hole 313 in the drawing. and,
This protrusion 314 is adapted to engage with a pin 133 implanted in the lower part of the head slider 13 in the figure. Furthermore, the driving slider 3 is located on the right side of the protrusion 314 in the through hole 313 in the figure.
A pair of locking portions 3 are arranged at a predetermined interval in the longitudinal direction of 1.
15,316 are formed. A bent engagement piece 276 formed on the extending portion 275 of the reverse drive lever 27 is interposed between the pair of locking portions 315 and 316.

Further, a bent engagement piece 317 is formed at the lower part of the through hole 313 in the drawing to be interposed between the locking portions 305 and 306 of the control slider 30.

If the tape is currently being played in the forward direction, the reverse drive lever 27 is in the position shown in FIG.
comes into contact with the locking portion 316 of the drive slider 31, and moves the drive slider 31 in the direction of arrow F in the figure. Furthermore, the bent engagement piece 317 of the drive slider 31
comes into contact with the locking portion 306 of the control slider 30, and the control slider 30 is also moved in the direction of arrow F in the figure.

When the regeneration state in the forward direction is switched to the regeneration state in the reverse direction as described above, the reverse drive lever 27 is rotated clockwise in the figure as shown in FIG. The engagement piece 276 comes into contact with the locking portion 315 of the drive slider 31, and moves the drive slider 31 in the direction of arrow E. At this time, the bent engagement piece 317 of the drive slider 31 is only moving between the locking portions 305 and 306 of the control slider 30, and the control slider 30 does not move. Further, as the drive slider 31 is moved in the direction of the arrow E in the figure, the pin 133 of the head slider 13 is moved downward in the figure along the taper of the protrusion 314, and as a result, as described above, the head slider 13 is moved in the direction of the arrow E in the figure. The slider 13 is moved backward in the direction of arrow D in the figure.

When the switching to the reproducing state in the reverse direction is completed, the drive slider 31 is sufficiently moved in the direction of arrow E in the figure, as shown in FIG. At this time,
The pin 133 of the head slider 13 is located beyond the top of the protrusion 314 of the drive slider 31 on the opposite side of FIG. At the same time, the left playback slider 25 is sufficiently moved in the direction of arrow C in the figure.
The head slider 13 having the protrusion 131 that engages with the engagement piece 252 is also moved in the same direction. Therefore, the pin 133 of the head slider 13 presses the protrusion 314 of the drive slider 31 in the opposite direction, and as a result, the drive slider 31 locks its locking part 315 with the bent engagement piece 276 of the reverse drive lever 27. It is moved sufficiently in the direction of arrow E in the figure more than being pressed. Further, the control slider 30 is also moved in the direction of arrow E following the movement of the drive slider 31.

On the other hand, when switching from the reverse playback state to the forward playback state, the reverse drive lever 2
7 is rotated in the counterclockwise direction in FIG. The control slider 30 is moved in the direction of arrow F, and the state shown in FIG. 3 is again achieved. It goes without saying that during this switching, the head slider 13 once retreats in the direction of arrow D and then moves forward again.

Here, during switching from the forward direction to the reverse direction and from the reverse direction to the forward direction, the driving slider 31 and the control slider 30 are moved in the directions of arrows E and F in the figure, respectively, by driving the head rotation mechanism described below. It is necessary to make
The head rotation mechanism will be explained below. Figure 6a
1 shows the appearance of the head rotation mechanism described here. First, to briefly explain the general structure and operation, the recording/reproducing head 14 is for a microcassette tape recorder, and the signal recording/reproducing head section 141 is connected to the tape contact surface 14.
2. They are arranged on one side of 2. The recording/reproducing head 14 is arranged in parallel with an erasing head 32 for a microcassette tape recorder, and is fitted into a substantially cylindrical head support 33.

Further, in the figure, reference numeral 34 denotes a head mounting structure, which rotatably supports a head base plate 35 and a gear 36 as shown in the figure. Furthermore, a substantially fan-shaped fan gear 37 that meshes with the gear 36 is rotatably supported on the head mounting structure 34 at its base.
In addition, a head support 33 is provided on the head base plate 35.
is attached.

Here, the head mounting structure 34 is such that its mounting portion 341 is brought into contact with the head slider 13 and is screwed, for example, with a screw (not shown).
With the head mounting structure 34 attached to the head slider 13, the tape contacting surface 142 of the recording/reproducing head 14 faces upward in FIG. Further, a driven portion 371 extends from the base of the sector gear 37, and the head mounting structure 34
is attached to the head slider 13, the driven portion 371 is connected to the fitting portion 30 of the control slider 30.
4. Note that even if the head slider 13 is moved in the directions of arrows C and D in FIG. 3, the driven portion 371 does not separate from the fitting portion 304 and is always interposed within the fitting portion 304. . Therefore, as described above, when switching the tape from the forward direction to the reverse direction and from the reverse direction to the forward direction, as the control slider 30 is moved in the directions of arrows E and F, the sector gear 37 also moves from the base. It will now rotate around the center.

For example, if the fan-shaped gear 37 is rotated in the direction of arrow G in FIG. 6a, the gear 36 meshing with the fan-shaped gear 37 is rotated in the direction of arrow H in the figure.
The head base plate 35 and the head support 33 are rotated in the same direction, so that the recording/reproducing head 14 and the erasing head 32 are rotated exactly 180 degrees as shown in FIG. 6b. Then, whereas in FIG. 6a, the head portion 141 was facing the lower track in the figure with respect to the tape 38 indicated by the two-dot chain line in the figure, after rotation it is as shown in FIG. 6b. Then, the head portion 141 comes to face the upper track of the tape 38 in the figure, and the track change (head movement) of the tape 38 is performed here when switching between forward and reverse directions. Further, when the sector gear 37 is rotated in the direction of the arrow I in FIG. Of course, the head 32 is returned to its original position.

Here, the upper recording/reproducing head 14 and the erasing head 3
2 is inserted into a normal head insertion hole formed in the cassette half and brought into contact with the tape 38 (the tape of the compact tape cassette).

Here, a pair of locking portions 351 and 352 are provided on a portion of the head base plate 35 in a protruding manner. Further, on one side of the head mounting structure 34,
A pair of screws 342 and 343 are screwed. As is clear from FIGS. 6a and 6b, the head base plate 35 is rotated until its locking portions 351 and 352 come into contact with the screws 342 and 343, respectively. Therefore, by adjusting the threading depth of the screws 342 and 343, the recording/reproducing head 14 and the erasing head 32 can be adjusted in the state shown in FIGS. 6a and 6b.
The azimuth can be adjusted. Also,
The recording/reproducing head 14 and the erasing head 32 are connected to each other via a connecting wire 39 passing through the center of rotation of the gear 36, after passing through the head support 33, head base plate 35, and head mounting structure 34 as described later. connected to the electrical circuit of the recording/playback system.

Further, on the peripheral side of the head support 33,
Arrows 40, 40 are provided to indicate the direction of tape travel with the head support 33 in the position shown in FIGS. 6a and 6b.

A tape guide portion 331 is formed on one side of the head support 33 to support both ends of the tape 38 in the width direction. The torsion spring 41 shown in FIG. 6b performs a two-stabilizing action to stably hold the head support 33 in the two positions shown in FIGS. 6a and 6b. Details will be described later.

Here, FIG. 7 shows details of how the head support 33 and the head base plate 35 are attached.
That is, the recording/reproducing head 1 is mounted on the head support 33.
Through holes 332 and 333 are formed vertically through the head support 33 on both sides of the central portion where the erase head 4 and the erase head 32 are attached. Further, the head base plate 35 is rotatably supported by the head mounting structure 34, and a through hole 353 through which the connection wire 39 is inserted is formed at the center of rotation.
Then, on both sides of this through hole 353, the head support 3
In the part facing each through hole 332, 333 of No. 3,
Screw holes 354 and 355 are formed.

With this configuration, the screws 42, 42 are connected to the tape contacting surface 142 of the recording/reproducing head 14 of the head support 33.
The head support 33 and the head base plate 35 are attached by inserting them into the through holes 332, 333 from the side and screwing them into the screw holes 354, 355 of the head base plate 35.

Further, FIG. 8 is an exploded perspective view showing the detailed structure of the above-mentioned head rotation mechanism. First, the head support 33 has a substantially cylindrical shape, and a substantially concave notch 334 is formed from a portion of the head support 33 to a substantially central portion thereof. The recording/reproducing head 14 is fitted into the approximately central portion of the notch 334 with its tape contacting surface 142 slightly protruding. Furthermore, the erasing head 32 is fitted into the end of the notch 334 of the head support 334.

On the other hand, the head mounting structure 34 has a through hole 345 extending through the head mounting structure 34 approximately in the center thereof.
is formed. A head base plate 35 and a gear 36 are rotatably supported on the head mounting structure 34 so that the through hole 345 is the center of rotation. Further, a through hole 361 passing through the gear 36 is formed at the center of rotation of the gear 36 . The connection wire 39 is connected to the head base plate 3.
5. Each through hole 3 of the head mounting structure 34 and gear 36
53, 345, 361, and when inserted through each of the through holes 353, 345, 361, they are bundled by a substantially cylindrical bundle member 43.

Also, a screw 3 screwed into the head mounting structure 34
42 and 343 both insert flat washers 44 and 44 and coiled springs 45 and 45,
A screw hole 346 formed in the head mounting structure 34,
347 is screwed on. For this reason, each screw 342,
343 is screwed into screw holes 346, 347 and is held stably without wobbling.

Here, the sector gear 37 has a base 372
A through hole 373 is formed in the through hole 373.
A screw 375 inserted therein through a substantially cylindrical spacer 374 is screwed onto one side of the head mounting structure 34, as shown in FIG. 9a. Rotatably supported. Further, one end portion of the torsion spring 41 is connected to an engagement piece 362 protruding from a part of the gear 36.
The other end of the torsion spring 41 is engaged with a through hole 376 formed near the base 372 of the sector gear 37 .

To explain the above-mentioned two-stabilizing action of the torsion spring 41, first, assuming that the sector gear 37 is in the position shown in FIG. 9a, the biasing force of the torsion spring 41 is as shown by the arrow in FIG. The fan-shaped gear 37 is rotated counterclockwise in the figure, and the gear 36 is rotated clockwise in the figure. However, in this state, the locking portion 351 of the head base plate 35, which rotates integrally with the gear 36, comes into contact with the screw 342, and the gear 36
Clockwise rotation in the figure is prevented. For this reason,
The head support 33 is held in the state shown in FIG. 6a without wobbling, and a stable state can be obtained.

Assume that in a stable state as shown in FIG. 9b, the fan-shaped gear 37 is rotated clockwise in the figure by holding its driven portion 371 against the biasing force of the torsion spring 41. Then, after the both ends of the torsion spring 41 are brought close to each other, the fan gear 37 is rotated to the position shown in FIG. A biasing force is applied to rotate the gear 36 clockwise and rotate the gear 36 counterclockwise in the figure. However, in this state, the locking portion 352 of the head base plate 35, which rotates integrally with the gear 36, comes into contact with the screw 343, and the rotation of the gear 36 in the counterclockwise direction in the figure is prevented. Therefore, the head support 33 is held in the state shown in FIG. 6b without wobbling, and another stable state can be obtained.

Here, Fig. 10 a, b and Fig. 11 a, b
1 and 2 respectively show the head rotation mechanism as viewed from various angles.

Therefore, according to the auto-reverse device using the head rotation mechanism as described above, first, the recording/reproducing head 14 and the erasing head 32 are rotated while always facing the tape 38 as shown in FIGS. 6a and 6b. Therefore, there is no need to provide a space for moving the head in the tape recorder mechanism as in the conventional case, and the tape recorder can be made smaller and lighter. The head rotation mechanism is constructed by attaching each head support 33, head base plate 35, gear 36, sector gear 37, etc. to the head mounting structure 34, which is a so-called assembly. Therefore, it is suitable for mass production, and the head mounting structure 34 can be attached to the head slider 13.
Since the head rotation mechanism can be attached by attaching it to the head, assembly work becomes extremely easy.

Furthermore, before the head rotation mechanism is attached to the head slider 13, that is, in an assembled state, there is no need to accurately adjust the azimuth of the screws 342, 343 and screw them into place.
343 only needs to be screwed on. In other words,
These screws 342 and 343 are inserted into the locking portion 35 of the head base plate 35 so that the gear 36 does not rotate in the state shown in FIG. 9b or c in the assembled stage.
1,352, and in short, it is enough to serve as a stopper for temporary fixing. When the head rotation mechanism is attached to the head slider 13, the screws 342, 34
3 to the correct azimuth adjustment position. Therefore, the head rotation mechanism becomes easier to assemble.

Further, the screws 42, 42 for attaching the head support 33 and the head base plate 35 are connected to the head support 33.
Since the recording/reproducing head 14 and the erasing head 32 are inserted from the exposed side, no screw heads or the like are exposed on the side surface of the head support 33. For this reason, an arrow 40 for indicating the tape running direction can be provided on the circumferential side of the head support 33. In other words, the screws 42,4
2 is inserted from the side of the head support 33 where the recording/reproducing head 14 and erasing head 32 are exposed, thereby making it possible to secure a space for providing the arrow 40 on the circumferential side of the head support 33.

Here, the arrow 40 for indicating the tape running direction is
In this case, arrows in opposite directions are provided on the circumferential surface of the head support 33 so as to indicate the tape running direction when the head support 33 is in the positions shown in FIGS. 6a and 6b. However, the means for indicating the tape running direction is not limited to arrows, but may be displayed in different colors for the forward and reverse directions of the tape. In short, it is sufficient to provide an indicator on the head support 33 that can distinguish between forward and reverse running of the tape. For example, a display example of the display section is shown in FIG. 12. Further, the display section is not only provided on the head support 33, but also may be provided with a separate display member (not shown) that rotates in conjunction with the head support 33, for example.

As described above, by providing the arrow 40 (display section), the tape running direction can be easily displayed without configuring a separate tape running direction display section. That is, because the head support 33 is rotated while the recording/reproducing head 14 and erasing head 32 remain facing the tape 38, the arrow 40 (indicator) is provided on the head support 33. The structure is extremely organic.

In addition, the head support 33 is shown in FIGS. 6a and 6b.
Since a torsion spring 41 is used to hold the device at the position shown in FIG.
That is, since both ends of the torsion spring 41 are engaged with the fan-shaped gear 37 and the gear 36, the torsion spring 41 itself becomes a component of the head rotation mechanism and cannot be prevented from being assembled. It is.

In a conventional head moving mechanism, a head assembly and, for example, a chassis are interlocked by a coiled spring. For this reason, even if the head assembly is attached to the chassis, it will not operate completely by itself, and it is necessary to engage the spring afterwards. In other words, the conventional head-side assembly is not completely assembled.

However, by using the torsion spring 41 as described above, the head rotation mechanism itself can sufficiently rotate the recording/reproducing head 14 and erasing head 32.
It has a structure sufficient to rotate and hold it stably, and is completely assembled. Therefore, the structure is simplified and the assembly workability can be improved compared to the conventional one.

Here, the upper recording/reproducing head 14 and the erasing head 3
2 are for micro cassette tape recorders. And the head support 3
3 is in the position shown in FIGS. 6a and 6b, both the recording/reproducing head 14 and the erasing head 32 are inserted through the head insertion hole formed in the cassette half of the compact tape cassette so that they can come into contact with the tape. being done. That is, the center of rotation of the head support 33 is determined such that the recording/reproducing head 14 and the erasing head 32 are both inserted into the head insertion hole of the compact cassette half at the two rotating positions.

Furthermore, in practice, when a recording/reproducing head for a microcassette tape recorder and an erasing head for a compact cassette tape recorder are arranged side by side, they will fit fully into the head insertion hole of the compact cassette half. Therefore, the erasing head 32 may be replaced with one for a compact cassette tape recorder, and in this case, the center of rotation of the head support 33 is rotated by the recording/reproducing head and the erasing head.
It is sufficient to place the head in a position that allows it to fit into the head insertion hole in any position.

Therefore, during playback (recording) in the forward and reverse directions of auto-reverse, only one recording/reproducing head 14 and one erasing head 32 are required, making the configuration simple and economically advantageous. In this regard, conventional tape recorders equipped with an auto-reverse function have a movable recording and reproducing head, and a pair of erasing heads are installed on both sides of the recording and reproducing head at positions corresponding to the pair of erasing head insertion holes in the compact cassette half. The structure is complicated and economically disadvantageous. However, as described above, at the two rotating positions of the head support 33,
By fitting both the recording/reproducing head 14 and the erasing head 32 into the head insertion hole of the compact cassette half, only one recording/reproducing head 14 and one erasing head 32 are required, which is advantageous in terms of structure and economy. At the same time, there is no need to electrically switch the recording/reproducing head 14 and erasing head 32 during forward/reverse switching.

Further, the recording/reproducing head 14 and the erasing head 32 are
Since they are attached to the same head support 33, it becomes easier to improve the accuracy of each other's tilt angle, gap relative position, push relative position, etc., and the heat dissipation effect can be improved.

Here, as the upper recording/reproducing head 14, a so-called combination head in which a recording/reproducing head and a reproducing head are arranged side by side can be used.
In this case, three heads including the erasing head will be attached to the head support 33.
At this time, it is sufficient to rotate the head support 33 so that all three heads enter the head insertion holes of the compact cassette half.

Next, FIG. 13 shows the positional relationship in which the pre-recording/re-recording head 14 contacts the tape 38 in the cassette half 46 of the compact tape cassette. As is well known, inside the cassette half 46, a pair of tape guide rollers 47, 47 and a pair of tape guide pins 48, 48 are provided on both sides thereof. Also, approximately in the center of the cassette half 46 is a tape pad 4.
9 is supported by a leaf spring 50. At predetermined positions of the cassette half 46, there are capstan insertion holes 461 and 462 into which the pair of capstans 17 and 18 are inserted, and a guide pin insertion hole into which a guide pin (not shown) protruding from the main chassis 11 is inserted. 463, 464, head insertion hole 465, erase head insertion hole 466, 4
67 and pinch roller insertion holes 468, 469 through which the pair of pinch rollers 15, 16 are inserted.

Here, the recording/reproducing head 14 and the erasing head 32 are both inserted into the head insertion hole 465 of the cassette half 46 and brought into contact with the tape 38, as shown in FIG. At this time, the erase head insertion holes 466 and 467 of the cassette half 46 have
A pair of tape guides 51, 51 attached to both sides of the head rotation mechanism of the head slider 13 are inserted through the tape guides 51, 51.

Here, it is assumed that the pinch roller 16 is in pressure contact with the capstan 18 via the tape 38, and the tape 38 is in a playback state running in the forward direction, that is, in the direction of arrow K in the figure. At this time, the rotation center line (i) of the head support 33 shown by the dashed line in the figure
In contrast, the center line (ii) of the recording/playback head 14 is at a predetermined interval.
It is shifted by (a) in the running direction of the tape 38.
Here, the rotation center line (i) is the cassette half 46
and coincides with the center of the tape pad 49. Further, the above-mentioned interval (a) is actually about 0.5 [mm].

By shifting the center line (ii) of the recording/reproducing head 14 by the distance (a) with respect to the rotation center line (i) as described above, the following effects can be obtained. That is, in the cassette half 46,
The leaf spring 50 to which the tape pad 49 is attached is supported with considerable wobbling. In particular, the leaf spring 50 has a large rattling in the longitudinal direction of the tape 38. For this reason, for example, when the tape 38 runs in the direction of arrow K in the figure, the leaf spring 5
0 is also moved in the same direction by the amount of the rattling. In other words, the center of the tape pad 49 is slightly shifted to the right in the figure from the center line (i).

Therefore, the center of the recording/playback head 14 should be set higher than the center of the tape pad 49 (cassette half 46).
By shifting the tape pad 49 by the distance (a) in the tape running direction, the center of the tape pad 49 will be located on the center line (ii) of the recording/playback head 14 while the tape 38 is running in the direction of arrow K. The tape 38 can be brought into stable and sufficient contact with the recording/reproducing head 14 by means of the tape pad 49, resulting in good recording and reproduction. Furthermore, the same thing can be said about the case where the running direction of the tape 38 is reversed. That is,
The pinch roller 15 is pressed against the capstan 17 via the tape 38, and the head support 33 is pressed against the capstan 17 via the tape 38.
Consider a situation in which the tape 38 is running in the direction of arrow L in the figure, facing in the opposite direction to that shown in the figure. Then, the center line (ii) of the recording/reproducing head 14 will be located to the left of the rotation center line (i) by the distance (a) in the figure. At this time, as the tape 38 travels in the direction of the arrow L, the tape pad 49 is also slightly moved in the same direction, and the same effect as in the above-mentioned state can be obtained.

As mentioned above, the feature of this invention is that the center of the recording/reproducing head 14 is slightly offset in the tape running direction from the center of the cassette half.

In addition, as shown in FIG. 14a, the erasing head 3
The top of the recording/reproducing head 14 is set higher than the top of the head 2 by a predetermined distance (b). This distance (b) is actually about 0.2 [mm]. By providing the recording/reproducing head 14 and the erasing head 32 at different heights in this way, the following effects can be obtained.

That is, for example, there is known a means for detecting an interval between songs for automatic cueing, which runs the tape at high speed with the tape 38 in light contact with the recording/reproducing head 14, and detects an unrecorded portion between songs. In such a case, the height of the recording/reproducing head 14 should be set to the height of the erasing head 3.
14b by making it higher than that of 2.
As shown in FIG. 3, since the tape 38 is brought into contact only with the leading end of the recording/playback head 14 and not with the erasing head 32, it is possible to prevent unnecessary load from being applied to the tape 38, and to achieve good track interval detection. It is something that can be done. It goes without saying that the present invention is effective not only for detecting between songs, but also for normal fast-forward playback (queue) and rewind playback (review).

Furthermore, as shown in FIG. 14c, even in the case of normal recording and playback, the tape 38
4 and the erasing head 32, thereby preventing deterioration in the characteristics of the recording signal and reproduction signal due to poor contact.

Further, as a means for bringing the tape 38 into sufficient contact with the recording/reproducing head 14 and the erasing head 32 during normal recording and reproduction, the means shown in FIGS. 15 to 17 may be used. First, as shown in FIG. 15, the erasing head 32 is installed vertically, and the recording/reproducing head 14 is mounted at an angle of a predetermined angle _.theta.1 with respect to the erasing head 32. Further, in the device shown in FIG. 16, contrary to FIG. 15, the recording/reproducing head 14 is installed vertically, and the erasing head 32 is installed at an angle of a predetermined angle θ ₂ with respect to the recording/reproducing head 14. It is something. Furthermore, in the one shown in FIG. 17, the recording/reproducing head 14 and the erasing head 32 are mounted at an angle of a predetermined angle θ ₃ relative to each other.

In this way, the recording/reproducing head 14 and the erasing head 3
By tilting one or both of tapes 3 and 2, it is possible to install tape 3 with an extremely simple configuration.
8 and the recording/reproducing head 14 and erasing head 32 can be sufficiently contacted.

Note that this invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist thereof.

Therefore, as detailed above, according to this invention, the center of the recording/playback head is positioned slightly offset from the center of the cassette half in the tape running direction when the tape is running in the forward and reverse directions in auto-reverse. Therefore, it is possible to provide an extremely good cassette tape recorder device that can compensate for the rattling of the tape pad and perform stable recording and playback.

[Brief explanation of the drawing]

1 and 2 are a front perspective view and a back perspective view, respectively, showing a cassette tape recorder to which this invention is applied, and FIG. 3 is a configuration diagram showing a forward/reverse switching mechanism for tape running in the cassette tape recorder. , Fig. 4 and Fig. 5 are respectively explanatory diagrams of the operation of the forward/reverse switching mechanism, Fig. 6 a and b are external views and explanatory diagrams of the operation of the head rotation mechanism, respectively, and Figs. 9a to 9c are exploded perspective views showing the detailed structure of the head rotation mechanism, and FIGS. 11a and 11b are configuration diagrams showing the head rotation mechanism as viewed from various angles, and FIG. 12 is a diagram showing a modification of the tape running direction display section provided in the head rotation mechanism,
FIG. 13 is a block diagram showing an embodiment of the cassette tape recorder device according to this invention, and FIGS. 14 a to 14 c are block diagrams and operation explanatory diagrams showing the mounting relationship between the recording/reproducing head and the erasing head and their functions, respectively. , and FIGS. 15 to 17 are configuration diagrams showing modified examples of the mounting relationship between the recording/reproducing head and the erasing head, respectively. 11...Main chassis, 12...Operation unit, 1
3...Head slider, 14...Recording/playback head, 1
5, 16... Pinch roller, 17, 18... Capstan, 19... Left reel stand, 20... Right reel stand, 21... Tape counter, 22... Motor, 23, 24... Operation lever, 25... ... Left playback slider, 26 ... Right playback slider, 27 ... Reverse drive lever, 28 ... Gear, 29 ... Lock lever, 30 ... Control slider, 31 ... Drive slider, 32 ... Erase head, 33 ... Head support, 34...Head mounting structure, 35...Head base plate, 36...Gear, 37...Sector gear, 38
... Tape, 39 ... Connection line, 40 ... Arrow, 4
1... Torsion spring, 42... Screw, 4
3... Wire bundle member, 44... Flat washer, 45...
...Spring, 46...Cassette half, 47...
... Tape guide roller, 48 ... Tape guide pin, 49 ... Tape pad, 50 ... Leaf spring, 5
1...Tape guide.

Claims (1)

[Scope of utility model registration request] A cassette tape recorder device equipped with a forward/reverse switching mechanism for switching the tape between forward and reverse constant speed running states includes: a head slider that slides in a predetermined direction in conjunction with the switching operation of the forward/reverse switching mechanism; A head support body supports a single recording/reproducing head and an erasing head supported by a slider with their respective tape contact surfaces exposed, and the head support body is moved forward and backward in conjunction with the switching operation of the forward/reverse switching mechanism. A mechanism for rotating the recording/reproducing head and erasing head with their respective tape contact surfaces facing the tape, and rotating and moving the recording/reproducing head and erasing head to two positions corresponding to the constant speed running of the tape in the forward and reverse directions. and a head rotation mechanism, wherein the center of the pre-recording head is closer to the tape than the center of the cassette half when the head support is in two positions corresponding to the tape forward and reverse constant speed running states. A cassette tape recorder device characterized in that the center of rotation of the head support is defined so as to be offset in the running direction.