JPS60143421A - Head device of tape recorder - Google Patents

Abstract

PURPOSE:To provide a head device for a tape recorder, in which the head can be moved without taking up a space in the tape recorder mechanism section when the forward movement is switched to reverse movement with a auto-reversing mechanism and which has a simple constitution and can be assembled easily. CONSTITUTION:A recording and reproducing head 14 and erase head 32 are set to rotate under a condition where they always face a tape 38 and rotating mechanisms of the heads are so called assembled ones in such a way that all of each head supporting body 33, head table plate 35, gear 36, sector wheel 37, etc., are fitted to a head fitting mechanism body 34. Moreover, it is arranged that the heads 14 and 32 are inserted through a head inserting hole formed in the cassette half of a compact tape cassette and can contact with a tape when the head supporting body 33 is at positions (a) and (b) of the figure. Therefore, one recording and reproducing head 14 and one erase head 32 are sufficient at the reproducing (recording) time of normal and reverse directions of auto-reverse. Accordingly, the constitution becomes simple and an economical advantage is realized.

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 allows 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/reproducing head of a tape recorder that employs the above-mentioned auto-reverse device needs to have an accurate azimuth angle to enable playback (recording) in the forward and reverse directions of tape running, that is, forward and backward movements. It must be able to be moved so that it can come into contact with the corresponding track of the tape depending on the tape running direction,
Conventionally, the recording/reproducing head is moved in a direction substantially perpendicular to the longitudinal direction of the tape, so it is necessary to provide enough space within the mechanical section of a cheap recorder to move the recording/reproducing head, which makes the tape recorder There is a problem in that it increases the size of the device 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 in the tape recorder mechanism, is easy to assemble, and does not cause deterioration of 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 tape forward/reverse in auto-reverse, and it also simplifies the configuration and facilitates assembly work. It is an object of the present invention to provide a head device for a tape recorder that is easy and very good.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. In other words, in the spear 1 figure and the fang 2 figure, 1
Reference numeral 1 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 part 12 is installed to protrude forward from the lower end of the main chassis IZ in Figure 1, and from the left end in Figure 1, there is a 5TOP operator 121 for stop and eject, and an R for rewinding.
, EW operator I22, PLA for reverse direction (backward operation) playback
Y (几) operator 123° REC operator 124 for recording
, PLAY (F) operator 125 for forward playback, OFF operator 126 for fast forward, and PAUSB operator 127 for pause (pause), each in the direction of the arrow (A) in a piano touch type. These operators 121 to 127 are arranged so that they can be freely suppressed and can be returned in the direction of arrow (B), and each of these operators 121 to 127 can put each drive system into a driving state through 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 fang 1 of the eave-like flat part 111 of the main chassis 11, and is engaged with a known locking mechanism (not shown). The 5TOP operator 12 is locked in the pressed state by the suppression operation.
One operating lever 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. In addition, the above PA [JSg operator 127
The operation lever operates independently without being connected to the i-sock mechanism in any way, and is a known bushing (not shown) disposed on the back side of the eave-like flat portion 111 of the main chassis 11 in the figure. It engages with the bushing mechanism, and the first pressing operation locks it in the pressed state, for example, temporarily stopping the reproducing state, and the second pressing operation releases the locked state, for example, returning it to the reproducing state. Make it work.

Each operating lever of the REW and FF operating elements 122 and 126 is connected to a forward/reverse switching mechanism t of a high-speed feed system (not shown).
- Functions to selectively drive the tape to run at high speed in forward or reverse directions. In addition, the above PLIAY(R)
and PLAY (F) operation levers 123 and 125 selectively drive the forward/reverse switching mechanism of the constant speed feed system, which will be described later, to run the tape at a constant speed in the forward or reverse direction. The head slider 13, which is slidable back and forth in the directions of the middle arrows (C) and (D), 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 to Pinch low 215, 16
f: By selectively bringing it into contact with a pair of capstans 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 makes the azimuth angle accurate and adjusts the tape according to the tape running direction. The head moving mechanism 100 is moved so as to come into contact with the track, and details of the structure and operation of this head moving mechanism 100 will be described later.

By the way, if you are using a normal tape recorder, you only need to play (record) in the forward direction, so of course you only need one PLAY control, but with the tape recorder that is capable of auto-reverse, which is the subject of this article, you can play (record) in the forward and reverse directions. Play in both directions (
Since it is necessary to perform recording (recording), the device is equipped with two mutually independent PLAY operators for forward and reverse directions.

Here, if only one of the two PLAY controls is operated, playback (recording) only in that direction is possible.
If both are operated at the same time, a so-called O) IJ verse can be achieved, and for normal playback (recording), it is better to operate only the PLAY operator in the forward direction.

In addition, the EgC operator 124 in the center of the illustration is the PLA
When operated in combination with the Y operator, the operating lever stops driving the recording system so that recording can be performed in only one direction, forward or reverse, or reciprocally by auto-reverse.

Furthermore, what protrudes from the center of the main shear 711 in Figure 1 is 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 the drawing, there are a tape counter 21 connected to the right reel stand 20, a 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.
3.24 is installed.

Here, Figure 3 is based on the above, Figure 171, and Figure 2.
This figure shows the forward/reverse switching mechanism of the fixed speed feed system. That is, what is indicated by a dotted line in the figure is the head 2 and the head 13, which is shown in a simplified manner from what is shown in Figure 1 for the sake of simplicity. The head slider 13 has a pair of protrusions 131 and 132 formed at predetermined positions on both sides thereof. The protrusions 131 and 132 of the head slider 13 are connected to the left and right playback sliders 2, 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.
5.26 can be engaged with engaging pieces 252, 262 formed at the lower part of the through holes 251 and 261 in the figure. Here, the above pressure and the right regeneration slider 25
．． 26 is a pair of elongated holes 253.2 formed respectively.
54, 263, 264, and guide pins 255, 256 and 265, 26 formed in 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.

The pressure and right playback sliders 25 and 26 are controlled by the PLAY (i(,) and PLAY (F) operators 12
3.125 operating levers are interlocked with each other via springs (not shown), and the PLAY (R)
When the and PLAY (F) operators 123 and 125 are operated, they are biased in the direction of the arrow (C) in the figure, respectively. Also, the above pressure and right, +1 + raw slider 25.
26 controls the rotation of the pinch rows 2151, 16 and the motor 22, respectively, and the right reel stand 19.20.
It controls the eye 2, gears, etc. (not shown) for transmitting the signals to each other. That is, the right playback slider 25
When it is slid in the direction of arrow (C) in the figure, it comes into pressure contact with the pinch row 51s2 Kyagusta/17 (see Figure 1), rotates the left reel stand 19 to wind the tape, and reverses the tape. The direction of travel is reproduced. Further, when the right reproducing slider 26 is slid in the direction of the arrow (C) in the figure, it presses the pinch roller 16 against the cab stun 18C"kL) and rotates the right reel stand 20 to wind the tape. Then, the tape is played back while running in the forward direction.

In other words, whether the tape runs in the forward or reverse direction depends on which of the right and right playback sliders 26°25
This is determined by whether it is moved in the direction of arrow (C) in the figure.

Here, a tapered locking portion 257 is formed on the upper right side of the left reproduction slider 250 in the drawing. Further, a locking portion 267 formed by a substantially concave notch is formed at a substantially central portion of the upper end of the right playback slider 260 in the drawing.

On the lower surfaces of the left and right playback sliders 25 and 26, a substantially T-shaped S/<-S drive lever 2 rotatably supported by a shaft 112 protruding from the main chassis 11 is provided.
7 is provided. A bent engagement piece 272 that engages with the locking portion 257 of the reproduction slider 25 is formed on the left side of the base 271 of the reverse drive lever 27 in the drawing.

Further, a bent engagement piece 273 that engages with the locking portion 267 of the right playback slider 26 is formed on the right 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.

In the elongated hole 274 of the reverse drive lever 27, a protrusion 28 is provided on one side of the gear 28, which is rotatably supported by a shaft 113 protruding from the main chassis 11.
1 is fitted. 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 pairs that bite into a lock lever 29, which will be described later, when the gear 280 rotates clockwise in the drawing. Locking portions 282 and 283 are formed. The locking portions 2B2, 283 are formed so as to face each other with respect to the axis 113t. Further, the lock lever 29 is rotatably supported by a shaft 114 protruding from the main chassis 11, and is selectively engaged with and detachable from the engagement parts 282 and 283 of the gear 28. A piece 291 is formed. The lock lever 29 normally has its engaging portion 291 locked with the locking portions 282 and 2 of the gear 28 due to the action of a spring (not shown).
83, that is, counterclockwise in the figure. In addition, this lock lever 29 is used when detecting the end of the tape when switching the reciprocating operation described 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 Figure 1). Then, the teeth 3 are rotated clockwise in the drawing against the biasing force of the spring, and the engaging portions 291 are disengaged from the locking portions 282 and 283 of the gear 28.

On the other hand, the gear 28 is always meshed with the gear 1 of the spear (not shown). The gear ratio between the gear of the spear 1 and the gear 28 is 1:2, and when the gear of the spear 1 rotates once, the gear 28 is rotated by half a rotation. The gear of the upper barb 1 is formed with a notch without a gear at a predetermined position, and the rotational force from the motor 22 is transmitted to the position opposite to this notch. A gear wheel for spear 2 is provided that rotates in one direction regardless of running. When this second gear is meshed with the gear 1, it is rotated so as to rotate the gear 28 clockwise in the figure.

In the above-described configuration, it is assumed that the auto-reverse is set and the PLAY (R), PL, and AY (F) operators 123 and 125f are both operated. Then, both the left and right playback sliders 25 and 26 are slid in the direction of the arrow <C in Figure 3 via the operating levers and springs that are linked to the PLAY < R) and PLAY (F) operators 123 and 125. Ru. Here, now, 17
As shown in FIG. 3, if the retaining portion 291 of the lock lever 29 is engaged with the locking portion 283 of the gear 28, the reverse drive lever 27 is restricted to the illustrated position by the position of the protrusion 281. That will happen. Therefore, the right reproduction slider 26 is sufficiently moved in the direction of arrow (C), but the left Niyu slider 25 has its locking portion 257 in contact with the bent engagement piece 272 of the reverse drive lever 27, and the left Niyu slider 25 is moved sufficiently in the direction of arrow (C). Arrow (C
) direction. Therefore, the right playback slider 2
6, the pinch row 216, idler, etc. are pressed against the capstan 18 or moved to a predetermined position for rotating the right reel stand 20, thereby performing playback in the forward direction. At this time, as the right playback slider 26 moves in the direction of arrow (C), the retaining piece 262 comes into contact with the protrusion 132 of the head slider 13,
The head slider 13' (moves in the direction of arrow (C). For this purpose, a recording/reproducing head 74 (see Figure 1) provided on the head slider 13, the details of which will be described later, comes into contact with the tape.

Also, at this time, since the right regeneration slider 25 is pressed in the direction of the arrow (C) by the entire reverse drive lever 27, the reverse drive lever 27 is given a rotational bias force in the clockwise direction in the figure. is added. Therefore, the gear 28 having the protrusion 281f 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, but the locking portion 283
is secured to the retaining portion 291 of the lock lever 29, so the gear 28 does not rotate and the reverse drive lever 27
It is stable in the position shown in Figure 3.

Assume that the tape reaches the end in the forward playback state as described above. Then, the aforementioned tape end detection mechanism rotates the lock lever 29 clockwise in the figure, as shown in FIG. At this time, as described above, in the state shown in FIG. 213, 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 the figure.

Then, the gear 1 meshed with this gear 28 becomes
It is slightly rotated in the opposite direction to gear 28.

Therefore, the gear 1 and the gear 3□2 are in mesh, and the rotational force of the gear 2 causes the gear 28 to rotate clockwise in the figure. When the notch part faces the gear of the fang 2 again after one rotation, the gear 28 rotates by hand just as shown in FIG.
It is locked at 1. At this time, the reverse drive lever 27 follows the protrusion 281 as the gear 28 rotates half a rotation.
is rotated clockwise in Figure 5. For this reason, the bent engagement piece 27 of the reverse drive lever ~27. ? 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, since the bent engagement piece 272 of the reverse drive lever 27 is released from the locking portion 252 of the left reproduction slider 25, the left playback slider 25 is sufficiently moved in the direction of arrow (C). therefore,
Pinch low 21 controlled by right playback slider 25
5, idler, etc. are pressed against the capstan 17,
The left reel stand 19 is rotated to a predetermined position, and playback is performed in the opposite direction. At this time, as the right reproduction slider 25 moves in the direction of the arrow (C), the retaining piece 252 comes into contact with the protrusion 13ZK of the head slider 13, causing the head slider 13 to move in the direction of the arrow (C). For this reason, the recording/reproducing head 14 provided on the head 2 (head 13) is brought into contact with the tape.

Here, in 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, the head 2 reader 13 temporarily moves to the arrow CD). Then, as the left or right reproduction slider 25 or 26 is moved in the direction of arrow (C), it is moved in the same direction.

In addition, in the state shown in Figure 5, the right playback slider 26
Since the full reverse drive lever 27 is pressed in the direction of the arrow (C), rotational force is applied to the reverse drive lever 27 in the counterclockwise direction in the figure. . For this reason, the gear 28 is given a rotational urging force in the clockwise direction in the figure, but the locking portion 28
2 is engaged with the retaining portion 291 of the lock lever 29, the gear 28 cannot be rotated, and the 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 lock lever 29 is rotated clockwise in the figure by the tape end detection mechanism as described above. In the same manner, the gear 28 is rotated half a turn clockwise in the figure, and the tape is again played back in the forward direction as shown in Figure 3. Furthermore, it can be easily seen from the above explanation that the tape forward/reverse switching mechanism described above operates not only at the end of the tape, but also when the operating lever 24 of the manual reverse mechanism is operated. , 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 explained above.
Next, the head moving mechanism 200 (see Figure 1) will be explained. That is, as shown in FIG. 3 again, the extending portion 275 of the reverse drive lever 27 is formed into a substantially T-shape.
A bent engagement piece 276 is formed at the tip. In addition, the long holes 254 of the left and right playback sliders 25.26
．． ,? The guide pins 256°266 inserted through the inside of 64 are
Between the left and right Niyu sliders 2.5, j6 and the main chassis 11, elongated holes 301, 302, 311, 312' are formed at both ends of the control slider 30 and the drive slider 31, which overlap each other. jl are inserted respectively. And these control sliders 30
and the drive slider 31 are each independently supported so as to be able to freely reciprocate in a direction substantially orthogonal to the sliding direction of the left and right playback sliders "25' and 26," that is, in the directions of arrows (E) and (F) in the figure. has been done.

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 figure, into which a driven part of a fan-shaped gear provided in a head rotation mechanism, which will be described later, is fitted. In addition, the above-mentioned through hole 30
3, on the right side of the fitting portion 804 in the figure, a pair of locking portions 305 are provided at a predetermined interval in the longitudinal direction of the control slider 30.
306 is formed.

On the other hand, approximately at the center of the drive slider 3.

A through hole 313 having the shape shown is formed. This through hole 31
In the upper part of FIG. 30, a substantially mountain-shaped protrusion 314 having tapers on both sides is formed. A pin 133 implanted in the lower part of the head slider 130 in the figure can be engaged with this protrusion 314. Furthermore, a pair of locking portions 315 and 316 are formed on the right side of the protrusion 314 in the through hole 313 at a predetermined interval in the longitudinal direction of the drive slider 31. The reverse drive lever 2 is placed between the pair of retaining parts 315 and 316
A bent engagement piece 276 formed on the extending portion 275 of No. 7 is interposed therebetween.

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

Assuming that the tape is currently playing in the forward direction,
The reverse drive lever 27 is in the position shown in Figure 3, and at this time its bent engagement piece 276 comes into contact with the retaining part 316 of the drive slider 3I, moving the drive slider 31 in the direction indicated by the arrow (
F) direction. Further, 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 the arrow (F) in the figure. When the reproducing state is switched to the reverse reproducing state as described above, the reverse drive lever 27 is rotated clockwise in the figure as shown in Figure 4.
The bent engagement piece 276 is the locking portion 31 of the drive slider 31.
5 and moves the drive slider 31t in the direction of arrow (E). At this time, the bent engagement piece 317 of the drive slider 31 is connected to the engagement portion 305° 306 of the control slider 30.
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 Z3 of the head slider 13
3 is moved downward in the figure by staying on the taper of the protrusion 314,
In the end, as mentioned above, in the switching process, the head switch 2
3 is moved backward in the direction of arrow (D) in the figure.

When the switching to the reciprocating state in the opposite direction is completed, as shown in FIG. The protrusion 314 of the drive slider 31
Go over the top of , and position it on the opposite side of Figure 113. At the same time, the left playback slider 25 is fully moved as indicated by the arrow (C) in the figure.
Since it is moved in the same direction, the hent lighter 13 having the protrusion 131 that engages with the retaining piece 252 is also moved in the same direction. Therefore, the pin 133 of the hent slider 13 presses against the protrusion 31'4 of the drive slider 31, thereby causing the drive slider 31 to close its locking part 315.
It is sufficiently moved in the direction of the arrow (E) in the figure more than the bending engagement piece 276 of the f/(-s) drive 27 presses. 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 above-mentioned reverse playback state to the forward playback state, the When the screw drive lever 27 is rotated counterclockwise in FIG. 15, its bent engagement piece 276 presses the locking portion 316 of the movable slider 31, and the following operation is approximately reverse to that described above. Then, the drive slider 31 and the control slider 30 are moved in the direction of arrow (F), and the state shown in FIG. 3 is again achieved. It goes without saying that even during this switching, the head slider 13 once retreats in the direction of arrow CD and then moves forward again.

Here, the reason why the drive slider 31 and the control slider 30 are moved in the directions of arrows (E) and CF in the figure during switching from the forward direction to the reverse direction and from the reverse direction force to the forward direction will be explained below. This is necessary for driving the head rotation mechanism, and will be explained below regarding the head rotation mechanism. Figure 6 (a) shows the appearance of the head rotation mechanism described here. First, to briefly explain the general configuration and operation, the front recording/reproducing head 14 is for a micro cassette tape recorder, and the signal recording/reproducing head section 141 is connected to the tape contacting section 1.
It is provided on one side of 42. The recording/reproducing head 14 is also arranged in parallel with an erasing head 32 for a micro cassette tape recorder, and is fitted into a substantially cylindrical head support 33.
1 is a head mounting structure, which rotatably supports a head base plate 35 and a gear 36 as shown in the figure. Further, on this head mounting structure 34, a substantially fan-shaped fan gear 37 that meshes with a gear 36 is rotatably supported at its base.Furthermore, a head support body 33 is attached to the head base plate 35. has been done.

Here, the head mounting structure 34 has its mounting portion 341
is in contact with the helad slider 13 and is screwed, for example, with a screw (not shown), and the head mounting structure 34
is attached to the slider 13, so that the contact surface 142 of the recording/reproducing head 14 faces upward in Figure 3.
A driven portion 3'il extends from a certain part of the white 9 car 37, and when the head mounting structure 34 is attached to the head slider Z3, the driven portion 371 is connected to the fitting of the control slider 30. 0, which is interposed within the portion 304,
Hent slider 13 is spear 3 arrows (C), (D)
Even if the driven portion 371 is moved in the direction, the driven portion 371
4, and is always interposed within the fitting portion 304.

Therefore, as described above, when switching from the tape full forward direction to the reverse direction and from the reverse direction to the forward direction, the control slider 30
As is moved in the directions of arrows (E) and (F),
The sector gear 37 is also rotated about the entire base.

For example, the sector gear 32 is located at the central part (G
) direction, the gear 3'6 fJ'' that meshes with the sector gear 37 is rotated in the arrow (H) direction in the figure, and the head base plate 35 and head support 33 are rotated in the same direction. , after all]・As shown in Figure 6 (b), the recording/reproducing head 1
4 and erase head 32 are now rotated by exactly 180 degrees. Then, in Fig. 6(a), the head part 141 was facing the tongue on the upper side j in the figure, as seen from the tape 38 indicated by the two-dot chain line in the figure, but after rotation, the head part 141 was facing the tongue in Fig. 6 ( b)
As shown in FIG. 2, the head portion 141 comes to face the upper track of the tape 38 in the figure, and the track change (-, rad movement) of the tape 38 is performed here when switching between forward and reverse directions. Furthermore, when the fan-shaped gear 37 is rotated in the direction of the central portion (I) in Fig. 6(b), the gear 36, head base plate 35, and head support 33 are rotated in the direction of the arrow (J') in the figure. Of course, the recording/reproducing head 14 and erasing head 32 are returned to their original positions.

Here, when the upper recording/reproducing head 14 and the erasing head 32 come into contact with the tape 38 (the tape of a compact tape cassette), they are inserted together into a normal head insertion hole formed in the cassette nozzle and come into contact with the tape. It is something that is touched.

Here, a pair of retaining portions 351 and 352 are provided on a portion of the head base plate 35 in a protruding manner. Further, a pair of screws 342, 3 are provided on one side of the head mounting structure 34.
43 is screwed on. As is clear from FIGS. 6(a) and 6(b), the head base plate 350 is rotated until its locking portions 351 and 352 come into contact with the screws 342 and 343, respectively. For this reason, the screw 342
By adjusting the screwing depth of ゜343,
) and (b), the azimuth adjustment of the recording head 14 and erasing head 32 can be performed. The recording/reproducing head 14 and the erasing head 32 are connected to each other via a connecting wire 39 that passes through the rotational center of the gear 36 after passing through the head support 33, head base plate 35, and head mounting structure 34 as described later. , is connected to an electric circuit section of a recording/playback system (not shown).

Further, on the circumferential side of the head support 33, an arrow 4 is provided to indicate the tape running direction when the head support 33 is in the position shown in FIGS. 3I-6 (a) and (b).
0.40 is provided.

Note that a tape 38 is attached to one side of the head support 33.
Tape guide portions 331 are formed to support both ends in the 0-width direction. Furthermore, the torsion spring 41 visible in Figure 6 (b) performs a two-stability action to stably hold the head support body 33 in the two positions shown in Figure 6 (a) and (bl). The details will be described later.

Here, Figure 7 shows the head support 33 and the head base plate 3.
This figure shows the details of the installation with 5. That is, the recording/reproducing head 14 and the erasing head 32 are mounted on the head support 33.
Through holes 332 and 333 passing through the head support 33 in the vertical direction are formed on both sides of the central portion where the head support 33 is 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, each through hole s of the head support body 33 is
There are screw holes 354.35 in the part facing sz and sss.
5 is formed.

With this configuration, the screws 42, 42f head support 33
The through hole 33 is opened from the tape contact surface 142 side of the recording/reproducing head 14.
2.333, and screw hole 354 of head base plate 35.
, 355, the head support body 33 and head base plate 35 are attached.

Moreover, FIG. 8 is an exploded perspective view showing the detailed structure of the above-mentioned head rotation mechanism. First, the head support body 33 has a substantially cylindrical shape, and a substantially concave notch 334 is formed from a portion of the head support body 33 to a substantially central portion thereof. The recording/reproducing head 14 is fitted into the notch 334 approximately in the center thereof with its tape contacting surface 1429 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, a through hole 345 passing through the head mounting structure 34 is formed approximately in the center of the head mounting structure 34 . The head mounting structure 34 has a through hole 3 therein.
The head base plate 35 and the gear 36' are rotatably supported so that the rotation center is the head base plate 35 and the gear 36'. In addition, the gear 36
A through hole 361 passing through the gear 36 is formed at the center of rotation. The connection wire 39 is connected to each through hole 353 of the head base plate 35, the head mounting structure 34, and the gear 36.
, 345, 361 are fully inserted, and each through hole 353,
345° 361f When inserting, the substantially cylindrical wire bundle member 4
It is bound by 3.

Also, a screw 342.3 screwed into the head mounting structure 34
43, a flat washer 44° 44 and a coiled spring 45, 45f;
It is screwed into screw holes 346 and 347 formed in the. Therefore, each of the screws 342 and 343 is stably held without wobbling when screwed into the screw holes 346 and 347.

Here, the sector gear 37 has a through hole 3 in its base 372.
73 is formed, and a screw 375 inserted into the through hole 373 via a substantially cylindrical spacer 374 is screwed into one side of the head mounting structure 34, as shown in Figure 9(a). By being attached, it is rotatably supported by the head mounting structure 34. Further, the torsion spring 4
1 has a retaining piece 36 protruding from a part of the gear 36.
2, and the other end of the torsion spring 41 is connected to the through hole 37 formed near the base 372 of the sector gear 37.
6. Then, to explain the above-mentioned two-stabilizing action of the torsion spring 41, first, assuming that the fan gear 37 is in the position shown in Figure 9(a), the biasing force of the torsion spring 41 is As shown by the arrows in FIG. 3B, 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, is attached to the screw 34.
2, the gear 360 is prevented from rotating clockwise in the drawing. Therefore, the head support body 33 is held without wobbling in the state shown in FIG. 6(a), and a stable state can be obtained.

In the stable state shown in Figure 9(b) above, the fan gear 3
7 is held by its driven portion 371 and rotated clockwise in the figure 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, when the fan gear 37 is rotated to the position shown in FIG. A biasing force is applied to rotate the gear 36 in a clockwise direction, and to 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 11° direction in the figure is prevented.

Therefore, the head support body 33 is held without wobbling in the state shown in FIG. 6(b), and another stable state can be obtained.

Here, J' l 0 Fig. 1a) I (b) and fang 1
1(a) and 1(b) 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 in a state where they are always facing the tape 38 as shown in FIGS. 16(a) and 16(b). Since the tape recorder is rotated by 200 degrees, there is no need to provide a space for moving the head in the two-recorder machine body part as in the conventional case, and the tape recorder can be made smaller and lighter. In addition, as for the head rotation mechanism, each head support 33, head base plate 35, gear 36, sector gear 37, etc. are all mounted on the head +t.
It is attached to the m-body 34 and is assembled into a so-called assembly. Therefore, it is suitable for mass production, and
Since the head rotation mechanism can be replaced by attaching the head attachment structure 34 to the head slider 13, the assembly work becomes extremely easy.゛Again. Before the head rotation mechanism is attached to the head slider 13, that is, in an assembled state, the screws 342 and 34 of the head rotation mechanism are
2'ff There is no need to accurately adjust the azimuth and screw the screws 342 and 343, and it is sufficient to simply screw the screws 342 and 343.

In other words, when the screws 342 and 343 are assembled, the screws 342 and 343 of the head stand 35 are fixed so that the gear 36 does not rotate in the state shown in Figure 9 (b) or (C).
1,352, 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 and 42 for attaching the head support 33 and the head base plate 35 are connected to the recording/reproducing head 1 of the head support 33.
4 and the erasing head 32 are inserted from the exposed side, so that no screw heads or the like are exposed on the side surface of the head support 33. For this reason, an arrow 40'f for indicating the tape running direction is provided on the circumferential side of the head support 33.
This is something that can be provided. In other words, the screw 42
, 42f By inserting the head support 33 from the side where the recording/reproducing head 14 and the erasing head 32 are exposed, it is possible to secure a space for providing the arrow 40 on the side surface of the circumference of the head support 330.

Then, as described above, the head support 33 is screwed onto the head base plate 35 from the side where the recording/reproducing head 14 and the erasing head 32 are exposed using the screws 42, 42, and the screw 3
A feature of the present invention is that the stopper function is performed by 42 and 343.

Here, the arrow 40 for indicating the tape running direction is set so that the head support 33 can indicate the tape running direction when the head support 33 is in the position shown in FIGS. 6(a) and 6(b). Arrows in opposite directions are provided on the circumferential side of the body 330, but the means for indicating the tape running direction is not limited to the arrows, but can also be color-coded for the forward and reverse directions of the tape. It may also be displayed. In short, the head support 33 has an indicator that can distinguish between forward and reverse running of the tape.
It is sufficient to set it in For example, an example of the display on the display section is shown in Figure 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 330 is rotated while the recording/reproducing head 14 and the erasing head 32 remain facing the tape 38, the head support 33 is provided with the arrow 40C display section. The composition is extremely organic.

In addition, the head support body 33t-head 6 (a) and (b)
) Since the toshigon spring 41f is used to hold it at the position shown in ), the structure and assembly can be simplified in this respect as well. That is, since both ends of the torsion spring 41 are engaged with the fan gear 37 and the gear 36, the torsion spring 41 itself becomes a component of the head rotation vA mechanism.
This is because assembly cannot be prevented.

In conventional head-moving machines, the head assembly and, for example, the chassis are interlocked by a coiled spring. For this reason, even if the head side assembly is installed in the entire chassis, it will not work completely by itself.
After that, it is necessary to attach the spring.

In other words, the conventional head-side assembly is not completely assembled.

However, by using the torsion spring 415 as described above, the head rotation mechanism is configured to be able to sufficiently rotate and stably hold the recording/reproducing head 14 and the erasing head 32 by itself, and is completely It has been assembled. Therefore, the structure is simplified, and the assembly and workability can also be improved compared to the conventional method.

Here, the upper recording/reproducing head 14 and the erasing/erasing head 32 are as follows.
Each one is for one micro cassette tail coder. Then, with the head support 33 in the position shown in FIGS. 6(a) and 6(b), both the recording/reproducing head 14 and the erasing head 32 insert the head insertion hole formed in the cassette half of the compact cheats cassette. It is designed so that it can be inserted through it and come into contact with the tape. In other words, the head support 33 supports its recording/reproducing head 14 at two rotating positions.
The center of rotation is determined so that both the erasing head 32 and the erasing head 32 fit into the head insertion hole of the compact cassette half.
When the rewriting head and the 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 head support 3
The center of rotation of No. 3 can be easily positioned so that the recording/reproducing head and the erasing head can enter the head insertion hole in either of the two rotational positions.

Therefore, auto-reverse forward/reverse playback (recording)
In some cases, the recording/reproducing head Z4 and the erasing head 32 each require 11 surfaces, which is simple and economically advantageous; in this respect, a conventional cheap recorder with an auto-reverse function The recording/reproducing head was made movable, and a pair of erasing heads were provided on both sides of the recording/reproducing head at positions corresponding to the pair of erasing head insertion holes in the compact cassette half, which resulted in a complicated configuration and was not economically viable. It's original. However, in the two positions where the head support 330 rotates as described above, the recording/reproducing head 1
4 and the erasing head 32 are both inserted into the head insertion hole of the compact cassette half, so that only one recording/reproducing head 14 and one erasing head 32 are required.
This is advantageous in terms of structure and economy, and also eliminates the need for electrical switching of the recording/reproducing head 14 and the erasing head 32 when switching between forward and reverse directions.

In addition, since the recording/reproducing head 14 and the erasing head 32 are attached to the same head support 33, it becomes easier to improve the accuracy of each other's tilt angle, relative gap position, relative pushing position, etc., and the heat dissipation effect is improved. can be raised.

Here, as the upper recording/reproducing head 14, it is possible to use a so-called combination head in which a recording head and a reproducing head are all arranged in parallel. In this case, three heads, including the erasing head, will be attached to the head support 33, and at this time, all three heads will fit into the head insertion hole of the compact cassette knife. It is sufficient if the head support body 33 is rotated in this manner.

Next, FIG. 113 shows the positional relationship in which the pre-recording/re-recording head I4 contacts the tape 38 in the cassette half 46 of the compact tape cassette. first,
As is well known, a pair of tape guide rollers 47, 47 and a pair of tape guide pins 48, 48 are provided in the cassette nozzle 46 on both sides thereof. Further, a tape pad 49 is supported by a leaf spring 50 approximately at the center of the cassette no.-746. The pair of capstans 17. Capstan insertion holes 461 and 462 into which the Ill is inserted, guide/insertion holes 463 and 464 into which guide bins (not shown) protruding from the main chassis 11 are inserted, head insertion holes 465, and erasing head insertion holes 466 and 467. and the pair of pinch rows 915.
Pinch roller insertion holes 468, 469, etc., into which the rollers 16 are inserted, are formed.

Here, the head insertion hole 46 of the cassette no.
As shown in FIG. 13, the recording/reproducing head 14 and the erasing head 32 are both inserted into the tape 5 and brought into contact with the tape 38. At this time, in the erasing head insertion holes 466 and 467 of the cassette half 46, a pair of tape guides 51.
51 are inserted together.

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 recording/reproducing head 14
The center line (11) of is shifted by a predetermined distance (a) in the running direction of the tape 38. Here, the rotation center line (I
) coincides with the center of the cassette half 46 and tape pad 49. Also, the above interval (a) is 0 in the actual case.
．． 5 Cmm, about 1.

As mentioned above, the recording/reproducing head 14 is
By shifting the center line (11) by the distance (a), the following effects can be obtained. That is, in the cassette half 46, the tape pad 4
The attached plate spring 50 of No. 9 is supported with considerable wobbling. In particular, the leaf spring 5o is attached to the tape 3
No. 8 has a large rattling in the longitudinal direction. For this reason, for example, when the tape 38 runs in the direction of arrow (K) in the figure, due to the friction caused by the running of the tape 38, the plate spring 50 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 entire tape pad 49 at the center of the recording/reproducing head 14
(cassette half 46) by the distance (a) in the tape running direction.
With the tape running in the direction of arrow (K), the center of the tape pad 49 is positioned on the center line (11) of the recording/reproducing head 14, and the tape 38 is moved by the tape pad 49 to the recording/reproducing head 14. This allows for stable and sufficient contact with the recording and playback systems, thereby ensuring good recording and playback performance. Also, when the running direction of the tape 38 is reversed,
The same thing can be said above. That is, the pinch roller 15 is pressed against the capstan 17 via the tape 38, the head support 33 is facing in the opposite direction to that shown in FIG. 13, and the tape 38 is running in the direction of the arrow (L) in the figure. think. Then, the center line (II) of the recording/reproducing head 14
is located to the left of the rotation center line m by the distance <a> in the diagram. 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, resulting in the same effect as in the above-described state.

In addition, as shown in FIG. 1'14 (a), the erasing head 32
The top of the recording/reproducing head 14 is located at a predetermined interval (
b) is made higher. This distance (b) is approximately 0.2 (m) in actual cases.

By providing the recording/reproducing head 14 and the erasing head 32 at different heights in this manner, the following effects can be obtained.

That is, for example, a known means for detecting an interval between songs for automatic cueing is one in which the tape 38 is brought into light contact with the recording/reproducing head 14 and the tape is run at high speed to detect unrecorded portions between songs.

In such a case, the height of the recording/reproducing head 14 may be adjusted by adjusting the height of the erasing head 3.
2, the tape 38 is brought into contact only with the leading end of the recording/reproducing head 14 and not with the erasing head 32, as shown in Figure 7114, so that unnecessary load is not applied to the tape 38. It is possible to prevent this, and to perform good song interval detection.

In addition to detecting between songs, normal fast-forward playback (cue)
Of course, it is also effective when performing rewind playback (review).

Furthermore, as shown in Figure 14 (C), even in the case of normal recording and playback, the tape 38 comes into sufficient contact with the recording/playback head 14 and the erasing head 32, and the recording signal and playback due to poor contact are prevented. This makes it possible to prevent deterioration of signal characteristics.

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 methods shown in FIGS. 15 to 17 may be used.

First, the one shown in Figure 15 is one in which the erasing head 32 is installed vertically, and the recording/reproducing head 14 is attached at a predetermined angle (θ1) with respect to the erasing head 32. In the case shown in Fig. 16, contrary to Fig. 15, the recording/reproducing head 14 is installed vertically, and the erasing head 32 is attached at a predetermined angle (θ2) with respect to the recording/reproducing head 14. be. Furthermore, in the one shown in FIG. 17, the recording/reproducing head 14 and the erasing head 32 are mounted at a predetermined angle (.theta.) relative to each other.

In this way, by tilting and mounting one or both of the recording/reproducing head 14 and the erasing head 32, it is possible to maintain sufficient contact between the tape 38 and the recording/reproducing head 14 and the erasing head 32 with an extremely simple configuration. It is something that can be taken.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but 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 when switching tape forward/reverse in auto-reverse, and the structure is simplified and assembly work is also facilitated. It is possible to provide an extremely good tape recorder head device that is easy to use.

[Brief explanation of drawings]

Figure 1 and Figure 2 are respectively a front perspective view and a rear perspective view showing a cassette tape recorder to which the present invention is applied, and Figure 213 is a configuration diagram showing a forward/reverse switching mechanism for tape running in the cassette tape recorder. Crucible, 4 figures and 1
'-5 is an explanatory diagram of the operation of the same forward/reverse switching mechanism, and figure 6 is
Figures (a) and (b) are external views and operation explanatory views showing one embodiment of the head device of a cheap record coater according to the present invention, and Figures 7 and 8 are details of the head rotation mechanism of the same embodiment, respectively. An exploded perspective view showing the configuration, Figure 9 (a
) to (C) are configuration diagrams and operation explanatory diagrams respectively showing the configuration and operation of the torsion spring used in the same head rotation mechanism, Figure 10 (a) I (b) and Figure 11 (3) I (b) Figure 12 is a configuration diagram showing the head rotation mechanism as seen from a different angle, Figure 12 is a diagram showing a modified example of the tape running direction display section provided in the head rotation mechanism, and Figure 13 is a diagram showing a modification of the tape running direction indicator provided in the head rotation mechanism. Configuration diagram showing the additional issue position of the recording/playback head, M□14 (a) to (C)
1 is a configuration diagram showing the mounting relationship between the recording/reproducing head and the erasing head and their functions, and an operation explanatory diagram 1. ! 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, r s
...Head slider, 14...Recording/playback head, 15°16...Pinch low 2.17.18...Cab stun, 19...Left reel stand, 20...Right reel stand. 21...Tape counter, 22...Motor, 23°24...Operation lever, 26...Left playback slider, 2
6...Right playback sushiida, 27...Reverse drive lever, XS...as, 29...Lock lever, 30...
...Control slider, 31...Drive slider, 32.-
...Erasing head, 33...Head support, 34...
Head mounting structure, 35...head base plate, 36 two gears,
37... Fan-shaped gear, 38... Tape, 39... Connection line, 40... Arrow, 41... Torsion spring, 42... Screw, 43... East line member, 44...・
Flat washer, 45...Spring, 46...Cassette half, 47...Tape guide row 2.48...
・Tape guide bin, 49...Tape pad, 5o・
...Plate spring, 51...Tape guide. Applicant's representative Patent attorney Takehiko Suzue Figure 3 C Figure 4 Figure 5 Figure 6 Figure 9 (a) (b) (c) Figure 10 (0) (b) - Figure 14 (a) ) (b) (C)

Claims (1)

[Claims] A tape recorder comprising a forward/reverse switching mechanism that switches the tape between forward and reverse constant speed running states, a head slider that slides in a predetermined direction in conjunction with the switching operation of the forward/reverse switching mechanism; A head mounting structure to be attached, 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 head support that supports the head with its tape contact surface exposed. and a mounting member for screwing the head support onto the head base plate from the side where the tape contacting surface of the head is exposed, and a mounting member provided on the head mounting structure to allow the tape to run at a constant speed in forward and reverse directions. 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 rotational 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 forward and reverse constant speed running, respectively.