JPH0378686B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a head device for a tape recorder, and particularly to one that can perform an auto-reverse function well.

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 forward motion without changing the tape loading state or the operating unit setting state at the end of the tape during the forward motion. 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-reversing 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 invention was made in consideration of the above circumstances, and it is possible to move the head without taking up space in the tape recorder mechanism when switching between forward and reverse tapes in auto-reverse, and it also improves the accuracy of the attachment of the head to the tape track. It is an object of the present invention to provide an extremely good head device for a tape recorder that can improve the performance of the tape recorder, has a simple structure, and is easy to assemble.

Hereinafter, one embodiment of the present 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 generally 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 (F) for forward direction (forward movement) playback.
The operator 125, the FF operator 126 for fast forwarding, and the PAUSE operator 127 for pause, each can be pressed in the direction of the arrow (A) in a piano-touch manner, and return in the direction of the arrow (B). These operators 121 to 127 are freely arranged, and each of these operators 121 to 127 can put each drive system into a driving state via an operation lever (not shown). 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 above
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 other operating elements that are in the locked state.
The operating lever of the PAUSE operator 127 operates independently without any engagement with the locking mechanism, and is located on the back side of the bottom flat portion 111 of the main chassis 11 in FIG. The first press operation locks the device in the push-in state, for example, temporarily stopping the playback state, and the second push operation releases the lock state, for example, the playback state is stopped. Make it function so that it can be restored in the current 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 123,
Each operation lever 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, and also to move the tape back and forth in the directions of arrows C and D in FIG. The movable head slider 13 is driven to bring the recording/reproducing head 14 mounted on the head slider 13 into contact with a predetermined surface of the tape, and the same pair of pinch rollers 15 and 16 are selectively moved between the pair of capstans. By bringing it into contact with 17 and 18, it functions to be in a reproducing state in the forward or reverse direction. Here, in order to enable playback (recording) in the forward and reverse directions of tape running, that is, forward and backward movements, the upper recording/reproducing head 14 naturally adjusts the azimuth angle accurately and tracks the corresponding tracks of the tape according to the tape running direction. The configuration 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 PLAY operators 123 and 125. Here, two PLAY operators 123 and 12
If only one of 5 is operated, playback (recording) can be performed only in that direction, and if both are operated at the same time, so-called auto-reverse can be achieved.In the case of normal playback (recording), It is only necessary to operate the PLAY(F) operator 125 in the forward direction.

In addition, the REC operator 124 in the center of the figure can be operated in combination with the aforementioned PLAY operators 123 and 125 so that recording can be performed in only one direction, forward or reverse, or back and forth by auto-reverse. The lever drives the recording 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 123,
125 operating levers and a spring (not shown).
When the (R) and PLAY (F) operators 123 and 125 are operated, they are biased in the direction of arrow C in the figure, respectively. Further, the left and right playback sliders 25 and 26 are connected to the pinch roller 15 and the right playback slider 25 and 26, respectively.
16 and the rotation of the motor 22 to the left and right reel stands 19, 20, respectively.
That is, when the left playback slider 25 is slid in the direction of arrow C in the figure, the pinch roller 15
is brought into pressure contact with a capstan 17 (see FIG. 1), and the left reel stand 19 is rotated to wind up the tape, thereby performing reproduction in which the tape runs in the reverse direction. Also, the right playback slider 2
6, when slid in the direction of arrow C in the figure, brings the pinch roller 16 into pressure contact with the capstan 18 (see Figure 1), rotates the right reel stand 20 to wind the tape, and winds the tape correctly. The direction of travel is reproduced. In other words, whether the tape runs in the forward direction or in the reverse direction is determined by which of the right and left reproduction sliders 26 and 25 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 272 that engages with the locking part 257 of the reproduction slider 25.
is formed. In addition, reverse drive lever 2
On the right side in the figure of the base 271 of No. 7 is a bent engagement piece 2 that engages with the locking portion 267 of the right playback slider 26.
73 is formed. 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. These PLAY(R) and PLAY(F) operators 123, 12
5, the left and right playback sliders 25 and 26 are both moved to the third
It is slid in the direction of arrow C in the figure. Here, as shown in FIG. 3, the engaging portion 2 of the lock lever 29
91 is engaged with the locking portion 283 of the gear 28, the position of the protrusion 281 restricts the reverse drive lever 27 to the illustrated position. 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, and are rotated in the forward direction. The regeneration is performed. At this time, as the right reproduction slider 26 moves in the direction of arrow C, its engagement piece 262 comes into contact with the protrusion 132 of the head slider 13, causing the head slider 13 to move 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 fitted into the elongated hole 274 of the reverse drive lever 27 is also subjected to a rotation biasing force in the clockwise direction in the figure. 3, the gear 28 does not rotate and the reverse drive lever 27 remains stable at the position shown in FIG. 3.

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.

Then, when the first gear rotates once and its notch again faces the second gear, the gear 28 rotates exactly half a rotation 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 figure, but since its engaging 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 can be easily seen from the above description 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 directions at any time during tape running.

The forward/reverse switching mechanism for tape running 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 extending portion 275 of the reverse drive lever 27, which is formed in a substantially T-shape. In addition, the long holes 254, 26 of the left and right playback sliders 25, 26
The guide pins 256 and 266 inserted through the left and right playback sliders 25 and 26 and the main chassis 11 have long lengths formed at both ends of the control slider 30 and the drive slider 31 that overlap each other. holes 301, 302 and 311,
312 are inserted through each. The control slider 30 and the drive slider 31 are independently connected to the left and right playback sliders 25 and 2.
It is supported so as to be slidable back and forth in a direction substantially perpendicular to the sliding direction of 6, that is, in the directions of 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 the arrow E shown 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 256 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).
The tape contact surface 1 of the recording/reproducing head 14 when the head mounting structure 34 is attached to the head slider 13
42 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 by inserting the head support 33, the head base plate 35, and the head mounting structure 34 as will be described later, and then connecting them to each other via a connecting wire 39 passing through the center of rotation of the gear 36, as shown in the figure. 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 support 33 includes the through holes 332, 333, and has circular recesses 332a, 333a concentric with the through holes 332, 333. Also,
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. Screw holes 354 and 355 are formed on both sides of the through hole 353 in portions of the head support 33 facing the through holes 332 and 333, respectively.
The head base plate 35 also has screw holes 354,
355, circular protrusions 354a, 355a are formed concentrically with the screw holes 354, 355.

With this configuration, the recess 3 of the head support 33
32a, 333a and the protrusion 354 of the head base plate 35
a, 355a, position it, and then tighten screw 4.
2, 42 are inserted into the through holes 332, 333 from the tape contact surface 142 side of the recording/reproducing head 14 of the head support 33, and then inserted into the screw holes 354, 35 of the head base plate 35.
5, the head support 33 and head base plate 35 are attached.

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 has a substantially concave notch 334 formed from a side thereof 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. Further, 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. Through holes 3 in 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.
As shown in FIG. 9a, a screw 375 inserted into the head through a substantially cylindrical spacer 374 is screwed onto one side of the head mounting structure 34, thereby rotating the head mounting structure 34. Supported for free movement. 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, once the both ends of the torsion spring 41 have approached each other, and the fan-shaped 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, 342 and screw them into place.
43 can be simply screwed on. In other words, these screws 342 and 343 are used to prevent the gear 36 from rotating in the state shown in FIG. 9b or c in the assembled stage.
352, and in short, it is enough to serve as a stopper for temporary fixing. Then, when the head rotation mechanism is attached to the head slider 13, the screws 342 and 343 may be adjusted 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, 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.

Further, the screws 42 and 42 are attached to the head support 33 that supports the recording/reproducing head 14 and the erasing head 32 by fitting them into the notch 334.
4 and erasing head 32 from the side where the tape contact surface is exposed and screwed onto the head base plate 35, recording can be performed regardless of the tightening force of the screws 42, 42. Unnecessary lateral pressure in the tracking direction is less likely to be applied to the recording/reproducing head 14 and the erasing head 32, and the recording/reproducing head 14 and erasing head 32 can be accurately attached to the tape track without misalignment in the tracking direction. Also, the precision in attaching the erasing head 32 to the tape track can be improved.

In this regard, in particular, the recesses 332a and 333a of the head support 33 and the protrusion 35 of the head base plate 35
4a and 355a, and attach the head support 3.
3 and the head base plate 35, the recording/reproducing head 14 and the erasing head 32 can be more accurately attached to the tape track, and the assembly work can be made easier.

Then, as described above, the blade recesses 332a, 333a of the head support 33 are fitted with the protrusions 354a, 355a of the head base plate 35, thereby positioning the head support 33 and the head base plate 35. This is a feature of this invention.

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

Therefore, as described in detail above, according to the present invention, the head can be moved without taking up space within the tape recorder mechanism during tape forward/reverse switching in auto-reverse, and the head can be moved relative to the tape track. It is possible to provide an extremely good tape recorder head device that can improve mounting accuracy, has a simple structure, and is easy to assemble.

[Brief explanation of drawings]

1 and 2 are a front perspective view and a back perspective view, respectively, showing a cassette tape recorder to which the present 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, FIGS. 6 a and b are external views and an explanatory diagram of the operation of the head rotation mechanism, respectively, and FIG. 7 is a tape recorder according to the present invention. FIG. 8 is an exploded perspective view showing the detailed structure of the head device, and FIGS. 9 a to 9 c show the structure of a torsion spring used in the head rotation mechanism. FIGS. 10a and 11b and FIGS. 11a and 11b are configuration diagrams showing the same head rotation mechanism as viewed from various angles. 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.

Claims (1)

[Claims] 1. In a tape recorder equipped with a forward/reverse switching mechanism that switches the tape between forward and reverse constant speed running states, the head slider is attached to a head slider that slides in a predetermined direction in conjunction with the switching operation of the forward/reverse switching mechanism. It has a head mounting structure, a head base plate rotatably supported by the head mounting structure in conjunction with the switching operation of the forward/reverse switching mechanism, and a recess into which the head is fitted, and the head is attached to the tape. A head support that supports the head with its abutting surface exposed, and a mounting method in which the head support is inserted through the head from the side where the tape abutment surface of the head is exposed, and the head support is screwed onto the head base plate. a recess formed including the insertion hole of the mounting member on the side of the contact surface between the member and the head base plate of the head support, and a recess formed on the side of the contact surface of the head base plate with the head support; a positioning protrusion that is formed to include a threaded hole in the mounting member and that is fitted into a recess in the head support; a head assembly including a stopper member that prevents rotation of the head base plate at a rotational position of the head according to the rotation position of the head; A head device for a tape recorder, characterized in that the head device is rotatably moved to two positions corresponding to the constant speed running of the tape in the forward and reverse directions.