JPS6338417Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a head holding device, and more particularly to a head holding device that can easily detect erroneous insertion.

A tape cassette used in a cassette tape recorder is normally designed to record on two tracks. In other words, when the tape cassette is used on side A, recording is performed on the upper half of the magnetic tape in the width direction, and when it is used on side B, recording is performed on the lower half. has been done. Accordingly, in accordance with this recording method, only half of the erasing head in the width direction of the tape is magnetized. That is, the magnetized portion comes into sliding contact only with the portion corresponding to the track to be recorded, so that only the signal of this track is erased in advance. However, when assembling a tape recorder, if the erasing head is installed upside down with one side and the other end swapped, the signal of the track to be recorded will not be erased, and the signal of the opposite track will not be erased. This results in the signal being erased.

SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to provide a head holding device that can easily detect incorrect insertion of a head.

Hereinafter, one embodiment in which the present invention is applied to a small pocket-sized tape recorder using a so-called microcassette will be described with reference to the drawings.
As shown in the figure, the outer casing of this tape recorder is formed in the shape of a flat rectangular parallelepiped, and a stop button 1, a forward button 2, and a record button 3 are arranged on the right side of the casing in order from the bottom. Further, a fast forward/rewind button 4 is provided on the top surface of the outer casing.
Further, a cassette mounting section 5 consisting of a recess is provided on the front surface of the housing of this tape recorder, and a microcassette 6 can be mounted in this mounting section 5. Note that a rotatable lid 7 is attached to this mounting portion 5.

Next, the internal mechanism of this tape recorder will be explained with reference to FIG. 2. The stop button 1 is fixed to a stop operating plate 8. A pair of elongated holes 9 are formed in this actuating plate 8, and the actuating plate 8 is supported slidably in the vertical direction in FIG. 2 by pins 10 on the chassis that engage with these elongated holes 9. .
Further, the actuating plate 8 is slidably biased by a double-acting coil spring 11 in the backward-acting direction, that is, downward in FIG. Next, the forward button 2 is fixed to the end of the forward actuating plate 12. The actuating plate 12 is supported so as to be slidable in the vertical direction in FIG. Sliding biased. A recording/reproducing head 17 is supported on the operating plate 12 via a head substrate 16. Also, this head board 16 has a pinch roller lever 18.
is rotatably supported via a pin 19.
The pinch roller lever 18 is urged by a coil spring 20 to rotate in a direction in which a pinch roller 21 on the lever 18 is pressed against a capstan 22.

A locking plate 23 is disposed at the bottom of the forward operating plate 12 so as to overlap the operating plate 12, and can be slid in the left and right directions in FIG. 2 by means of a pair of pins 24 and 25 on the chassis. is supported by This lock plate 23 is connected to the coil spring 2.
3a to slide to the right in FIG. A pair of bent pieces 26 and 27 are connected to the lock plate 23. The bent piece 26 is inserted into an opening 28 of the stop operating plate 8 and is configured to be pressed by an inclined surface 29 of the opening 28. Further, the other bent piece 27 is in contact with the inclined surface 30 of the forward actuating plate 12. Continuing from this inclined surface 30, a step portion 31 for locking is formed on the actuating plate 12.

The recording button 3 is fixed to the end of the recording operation plate 32. The actuation plate 32 is supported by the pins 25 and 33 so as to be slidable in the vertical direction in FIG. 2, and is urged to slide downward by a coil spring 34. As shown in FIGS. 3 and 4, on this operating plate 32,
A head substrate 35 is supported. That is, the rectangular long hole 36 of this head board 35 is connected to the pin 25.
At the same time, the bent piece 37 of the base plate 35 is engaged with the stepped portion 38 of the actuating plate 32. A lock lever 39 is disposed on the lower surface of the actuating plate 32 and is attached to the actuating plate 32 with screws 40. Boss portion 4 of this lock lever 39
A coil spring 42 is wound around the lock lever 1 , and one end of the coil spring 42 is engaged with one side of the lock lever 39 . As a result, the lock lever 39 is urged to rotate clockwise about the screw 40 in FIG. 4. The other end of the spring 42 is engaged with the bent piece 37 of the head board 35, thereby urging the board 35 to slide upward in FIG. That is, this coiled spring 42 rotationally biases the lock lever 39 and also urges the head board 3
It is designed to act as a limiter spring. The tip of the lock lever 39 is the lock plate 23.
It is configured to be able to engage with the stepped portion 43 at the tip of the holder.

As shown in FIG. 5, the head board 35 includes:
A head holding portion 45 having a head insertion recess 44 whose longitudinal section in FIG. 5 is approximately U-shaped is integrally provided. By being inserted into the head insertion recess 44, the erasing head 46 is held by the head holding portion 45. Moreover, on one of the pair of side walls of this holding portion 45, that is, on the right side wall in FIG. 5, a protrusion 47 is provided to protrude upward in FIG. That is, as is clear from FIGS. 5 and 6, the height of the right side wall is higher than that of the left side wall opposite to the right side wall. Corresponding to the protrusion 47, the erasing head 46 has a step 48 formed on one side thereof facing in the insertion direction. Therefore, when the erasing head 46 is inserted into the holding portion 45 in a normal state, the step 48 of the head 46 does not come into contact with the protrusion 47 and the fifth
As shown in the figure, it is inserted into the recess 44 to a predetermined position where it is completely accommodated, and is held by the holding part 45.
On the other hand, if the erasing head 46 is incorrectly inserted into the holder 45 with the one side surface and the other side opposite to the one side reversed upside down, as shown in FIG. The stepped portion 4 of this head 46
8 abuts on the protrusion 47, the erasing head 46 is only inserted halfway into the predetermined position. Therefore, when the erasing head 46 is inserted upside down, as is clear from a comparison of FIGS. Since it protrudes greatly in the direction, it can be easily identified with the naked eye. In other words, the above-mentioned erroneous insertion of the erase head 46 can be detected very easily.

Generally, tape recorders are equipped with a dummy cassette in the middle of the manufacturing line to perform various tests, but by configuring the tape recorder as described above, if the erasing head 46 is inserted incorrectly, During this test, the erasing head 46 comes into contact with the cassette and the record button 3 cannot be pushed to the lock position. Therefore, this can be easily detected during the above test, and work errors can be corrected. Therefore, the magnet can be placed only at a predetermined position on the tape sliding surface of the erasing head 46, that is, at a portion corresponding to the track to be recorded among the two tracks of the tape.

As shown in FIG. 2, the fast forward/rewind button 4 is fixed to a fast forward/rewind operating plate 50 which is rotatably supported by a pin 49. An engaging piece 51 is integrally connected to the actuating plate 50 . This engaging piece 51 is adapted to be able to engage with an engaging piece 53 at one end of the intermediate lever 52. The intermediate lever 52 is rotatably supported by the actuation plate 32 via a pin 54. and intermediate lever 5
A U-shaped recess 55 is formed at the other end of the lock lever 2, and this recess 55 receives the protrusion 56 of the lock lever 39. Therefore, the rotation of the actuating plate 50 is transmitted to the lock lever 39 via the intermediate lever 52, so that the actuating plate 32 to which the record button 3 is attached is unlocked.

The fast forward/rewind operating plate 50 further includes three recesses 57, 58, 5 on the left side in FIG.
9 are formed, and these recesses 57, 58,
Lock lever 60 is on the chassis opposite to 59.
are arranged. This lock lever 60 is rotatably supported by the pin 14, and
It is urged to rotate clockwise in FIG. 2 by a coil spring 61. A locking portion 62 formed protruding from this lever 60 is connected to the three recessed portions 5.
7, 58, 59, thereby the actuating plate 5
0 is locked in the rewind state, neutral state, and fast forward state, respectively. Further, the arm 63 formed on the lock lever 60 is adapted to come into contact with the bent piece 64 of the forward actuating plate 12, so that the lock lever 60 rebounds against the coil spring 61 in the forward state. It is designed to be rotated clockwise and retracted to a non-operating position. Therefore, in the queue and review modes, the actuating plate 50 is not locked.

A folding piece 65 is further integrally connected to the fast forwarding/rewinding operation plate 50, and this folding piece 65 engages with an opening 67 of an intermediate transmission plate 66. This transmission plate 66 has a pair of pins 6 that engage with a pair of elongated holes.
8 to be slidably supported in the left and right directions in FIG. 2, and a pair of coil springs 69,
70 to the left and right, respectively. Therefore, when no force is applied from the actuation plate 50, the transmission plate 66 is held at the intermediate position shown in FIG. 2 to prevent malfunction.

A pressing lever 71 is disposed below the transmission plate 66 so as to overlap with the transmission plate 66. The pressing lever 71 is rotatably supported by a pin 71a, and a pin 72 provided on the lever 71 can come into contact with an inclined surface 73 of the transmission plate 66. Further, this pressing lever 71 is provided with a pair of arms 74 and 75. The first arm 74 is adapted to press against the end of the idler support plate 76. This support plate 76 is supported by a pair of pins 77 so as to be slidable in the vertical direction in FIG. are doing. The idler 79 is configured to transmit rotational force to a transmission wheel 81 fixed to a reel shaft 80 on the winding side. On the other hand, the second arm 75 of the pressing lever 71 is connected to the switching lever 82.
It is configured to press the stepped portion 83 of. This switching lever 82 is rotatably supported by a reel shaft 84 on the supply side, and is urged to rotate counterclockwise in FIG. 2 by a coil spring 85. And this lever 82 has a pin 86
The idler 87 is rotatably supported via. The idler 87 engages with a transmission wheel 88 fixed to the reel shaft 84 to transmit rotational force to the transmission wheel 88.

An opening 89 is formed at the left end of the intermediate transmission plate 66 in FIG. 2, and a bent piece 91 formed at one end of a transmission lever 90 is inserted into this opening 89. This lever 90 is rotatably supported by a pin 92.
A bent piece 93 is formed at the other end of the switch plate 94, and this bent piece 93 engages with a notch 95 of a switch plate 94. The switch plate 94 is supported so as to be slidable in the vertical direction in FIG. 2 by a pin 94a that engages with a pair of elongated holes. Therefore, by means of the transmission lever 90, the movement of the intermediate transmission plate 66 in the left-right direction in FIG. 2 is converted into the movement of the switch plate 94 in the vertical direction in FIG. A bent piece 96 is formed on the side of the switch plate 94, and the bent piece 96 is configured to press the tip of the pinch roller lever 18.

A leaf switch 97 is further arranged on the side of the switch plate 94. This switch 97 is for switching the motor drive circuit, and has a pair of conductive springs 99 each having a contact 98 at its tip. These pair of springs 99 are made of an insulating material provided on the switch plate 94.
For example, the recess 10 of the operator 100 made of synthetic resin
It is inserted within 1. Therefore, this switch board 9
4, opening and closing of the switch 97 is controlled via the operator 100.

The operator 100 is attached to the switch plate 94 as shown in FIG. First, switch board 9
4 has a notch 1 at the position where the operator 100 is attached.
02 is formed in advance. In contrast, the operator 100
A slit 103 having a width approximately equal to the thickness of the switch plate 94 is formed on both sides of the switch plate 94, and a locking arm 104 is integrally connected to the tip thereof.
Then, while elastically deforming the arm 104, the operator 100 is inserted into the notch 102 so that the slit 103 engages with the edges on both sides of the notch 102, and the claw 105 at the tip of the arm 104 is placed on the side of the switch plate 94. Engage the ends. In this way, the operator 100 can be easily attached to the switch plate 94.

When the switch is operated by pushing the conductive spring 99 with the insulating operator 100 provided on the switch plate 94, the switch is operated by a stroke equal to the distance between the pair of contacts 98, as shown in FIG. It is only necessary to move the plate 94, and the movement stroke of the switch plate 94 can be made small. In other words, the stroke of the switch plate 94 becomes smaller than when insulating caps are provided at the ends of the pair of springs 99 of the switch 97 instead of providing the insulating operator 100 on the switch plate 94. Moreover, when using an insulating cap,
Two of these caps are required, but the switch board 9
When disposing the insulating operator 100 on 1
Therefore, the number of parts is reduced. Furthermore, the operation element 100 can be attached very easily as shown in FIG. 7.

Next, the operation of this tape recorder having the above structure will be explained. First, the recording mode will be explained with reference to FIG. 9. This recording mode is the second recording mode.
This is achieved by pressing the record button 3 in the stop mode shown in the figure. When you press record button 3,
The recording operation plate 32 to which the button 3 is attached is moved upward against the coil spring 34 as shown in FIG. 9 while being guided by the pins 25 and 33. The lock lever 39 on the actuating plate 32 also moves upward in the figure, and the lock lever 39 climbs over the stepped portion 43 of the lock plate 23. After this, the actuating plate 32 is further moved slightly upward, as shown by the chain line in FIG. Then, the lock lever 39 is rotated clockwise about the screw 40 by the coil spring 42, and is in a state where it can engage with the stepped portion 43 of the lock plate 23. After this, when you release your finger from the record button 3, the actuating plate 32 moves back downward by the above-mentioned slight overstroke by the spring 34, and the lock lever 39 moves the lock plate 23 as shown by the solid line in FIG. step 43
engage with. In this way, the operating plate 32 to which the record button 3 is attached is locked in the forward movement position.

Also, as the actuating plate 32 moves forward, the coiled spring 42
Since the head substrate 35 disposed on the actuating plate 32 is pressed through the actuating plate 32, the head substrate 35 holding the erasing head 46 together with the actuating plate 32 is pressed.
moves forward. However, before the actuating plate 32 moves forward to its maximum stroke, the erasing head 46 comes into contact with a guide (not shown) of the tape cassette 6 and stops at the position shown by the solid line in FIG. Therefore, after this, only the actuating plate 32 moves, and the head board 35 retreats relative to this actuating plate 32, and the coil spring 42 moves in proportion to this relative amount of retreat.
will undergo elastic deformation. After the actuating plate 32 moves forward to the maximum stroke, this actuating plate 3
2 returns to the locked position, that is, the solid line position in FIG. 10, but at this time it remains in this position because it is pressed upward in FIG. Therefore, the erase head 46 does not move back.

In this way, the coil spring 42 functions as a limiter spring for the head board 35 that supports the erasing head 46, and elastically presses the erasing head 46 against the cassette 6 to hold it in the correct position. . Furthermore, this coiled spring 42 is connected to the lock lever 3.
The spring 42 also functions as a spring that urges the spring 9 to rotate in the locking direction, so one spring 42 performs two functions, reducing the number of parts.

As described above, as the recording operation plate 32 moves forward as shown in FIG. 9, the operation plate 32 switches the recording/reproduction changeover switch (not shown) to put the recording/reproduction circuit in a recordable state. Further, since the bent piece 106 of the actuating plate 32 presses the bent piece 107 of the forward actuating plate 12, the actuating plate 12 moves upwardly against the coil spring 15 as shown in FIG. Then, the inclined surface 30 of this actuating plate 12 climbs over the bent piece 27 of the lock plate 23, and this bent piece 2
7 engages with the stepped portion 31 of the actuating plate 12. In this way, the actuating plate 12 is locked by the locking plate 23 in the forward position. This forward movement of the actuating plate 12 closes a power switch (not shown), and the motor starts rotating. When the forward operating plate 12 is moved forward, the recording/reproducing head 17 supported by the operating plate 12 via the head substrate 16 moves forward to a position where it comes into contact with the magnetic tape in the cassette 6. Moreover, the head board 16 and the lever 1 are attached to this actuating plate 12.
A pinch roller 21 supported by a pinch roller 8 presses the magnetic tape against a capstan 22.
Since the capstan 22 is rotated by the motor, the magnetic tape is thereby run at a predetermined speed. Further, the rotation of the motor is transmitted to the transmission wheel 81 via the idler 79, and the reel shaft 80 is rotationally driven. Therefore, the magnetic tape running is wound by the reel in the cassette 6 that engages with the reel shaft 80, and a desired recording mode is developed.

To cancel the recording mode, just press stop button 1. By pressing the stop button 1, the stop operating plate 8 moves upward in FIG. 9 against the coil spring 11, and the inclined surface 29 of this operating plate 8 presses the bent piece 26 of the lock plate 23. . Therefore, the lock plate 23 moves to the left in FIG. are disengaged from each other, whereby both the forward operating plate 12 and the recording operating plate 32 move backward. Therefore, the stop mode shown in FIG. 2 is established.

Although the operation in the reproduction mode is not shown, this operation can be performed by pressing the forward button 2 in the stop mode shown in FIG. As a result, the recording/reproducing head 17 and the pinch roller 21 move forward as in the recording mode. Moreover, at this time, the recording operation plate 32 does not move forward, so
The recording and reproducing circuit is in the reproducing state, and the erasing head 46 does not move forward and is in the reproducing mode. That is, this reproduction mode corresponds to the state in which the recording button 3 and the recording operation plate 32 move backward in the recording mode shown in FIG.

Next, the rewind mode of this tape recorder will be explained with reference to FIG. 11. In the rewind mode, in the stop mode shown in FIG. 2, press the fast forward/rewind button 4 and move the operating plate 50 as shown in FIG. Rotate counterclockwise around pin 49. Then, the recess 57 of the actuating plate 50 engages with the locking part 62 of the lock lever 60, whereby the actuating plate 50 is locked in the rotational position. Since the actuating plate 50 rotates counterclockwise in FIG. 11, the intermediate transmission plate 66, which is interlocked with the actuating plate 50 via the bent piece 65, moves to the left as shown in FIG. Moving.

When the transmission plate 66 moves, its inclined surface 73 pushes the pin 72 to rotate the pressing lever 71 about the pin 71a, and the first arm 74 of this lever 71 moves the idler support plate 76 as shown in FIG. Press downwards. Therefore, the idler 79 supported by the support plate 76 is separated from the transmission wheel 81, and transmission of rotational force to the reel shaft 80 on the winding side is prevented. Instead, the second arm 75 of the lever 71
presses the stepped portion 83 of the switching lever 82 and moves the lever 82 against the coil spring 85 to the reel shaft 84.
Rotate clockwise around lever 8.
The idler 87 on 2 is engaged with the idler 79. Therefore, the rotation of the motor is transmitted to the transmission wheel 88 via the idlers 79 and 87, and the reel shaft 84 on the supply side is driven.

Furthermore, as the transmission plate 66 moves, the transmission lever 90 rotates counterclockwise about the pin 92 as shown in FIG.
moves downward, and the operator 1 of this switch plate 94
00 closes leaf switch 97. Therefore, the drive circuit of the motor is switched, and the motor rotates at high speed. Therefore, the reel shaft 84
The magnetic tape is rewound at high speed by the reel engaged with the reel, and a rewind mode is established. To cancel this rewind mode, the fast forward/rewind button 4 may be rotated clockwise about the pin 49 in FIG. 11 to return it to the neutral position shown in FIG. 2. This results in the stop mode shown in FIG.

Next, regarding the fast-forward mode, although the illustration of its operation is omitted, this fast-forward mode
Rotate the rewind button 4 in the opposite direction to the rewind mode operation, that is, clockwise around the pin 49 in FIG.
may be engaged with the lock portion 62 of the lock lever 60. When the actuation plate 50 is rotated clockwise,
Since the intermediate transmission plate 66 moves in the opposite direction to that shown in FIG. is transmitted to the transmission wheel 81 via the reel shaft 80 on the winding side.
is rotated. Moreover, as the transmission plate 36 moves to the right, the switch plate 94 is activated via the transmission lever 90.
moves upward, so the switch 97 is switched and the motor rotates at high speed. Therefore, the magnetic tape is wound at high speed on the reel that engages with the reel shaft 80, and a fast forward mode is established.

Next, the review mode (see FIG. 12) and the cue mode will be explained. These modes appear as a combined operation of the playback mode and the rewind mode, and a combined operation of the playback mode and the fast-forward mode, respectively. Therefore, in the review mode, the magnetic tape is played back while being rewound at high speed. Therefore, at this time, the direction of rotation of the capstan 22 is opposite to the direction in which the magnetic tape is run. Therefore, as shown in FIG. 12, by utilizing the downward movement of the switch plate 94, the bending piece 96 rotates the pinch roller lever 18 counterclockwise about the pin 19, and the pinch roller 21 is spaced apart from the capstan 22. In the queue mode, although not shown, the magnetic tape runs while being restrained by the pinch roller 21 and capstan 22. However, since the switch 97 is changed by the movement of the switch plate 94 and the rotational speed of the motor is increased, the magnetic tape is run at about twice the speed as in the reproduction mode. In addition, in the review mode and the queue mode, the forward button 2 is pressed and the forward operating plate 12 is in the forward position, so that the bending piece 64 of the operating plate 12 acts as shown in FIG. The arm 63 of the lock lever 60 is pushed, and the lock lever 60 is rotated against the coil spring 61. Therefore, this lock lever 60 is retracted to the non-operating position and does not lock the actuating plate 50. That is, in the review mode and the queue mode, the fast forward/rewind button 4 is not locked, and when the button 4 is released, the playback mode is immediately entered.

Next, the operation of one touch review will be explained with reference to FIG. To operate the one-touch review, move the fast forward/rewind button 4 to the rewind side in the recording mode, immediately switch from the recording mode to the review mode, and then release your finger from the fast forward/rewind button 4 in this review mode to start playback. It is a mode. Therefore, it is possible to sequentially switch from the recording mode to the review mode and from the review mode to the reproduction mode without going through the stop mode, which is very convenient when immediately rewinding and reproducing the recorded contents.

As shown in FIG. 13, the one-touch review operation is performed by first pressing the fast forward/rewind button 4 in the recording mode to rotate the operating plate 50 counterclockwise about the pin 49. Then, as in the case of switching to the rewind mode, the idlers 79, 87
Then, the switch 97 is switched, and the magnetic tape is rewound at high speed by the reel that engages with the reel shaft on the supply side. Further, as the actuating plate 50 rotates counterclockwise in FIG.
The engaging piece 51 of the actuating plate 50 engages with the engaging piece 53 of the intermediate lever 52, and the intermediate lever 52 is connected to the pin 5.
Rotate clockwise around 4. Therefore, the recess 55 at the other end of this lever 52 is the lock lever 3.
9, the lever 39 is rotated counterclockwise in FIG. 13 about the screw 40 against the coil spring 42. Therefore, the lock lever 39 is disengaged from the stepped portion 43 of the lock plate 23, and the recording operation plate 32 is also unlocked. Therefore, the actuating plate 32 is moved back by the coil spring 34. However, since the forward operating plate 12 is still locked by the locking plate 23 in the forward movement position, the recording mode is switched to the review mode.

In this review mode, the portion of the magnetic tape recorded in the recording mode is rewound at high speed. In this review mode, since the forward operating plate 12 is moving forward, the lock lever 60 is rotated to the non-operating position, and the operating plate 50 is not locked. Therefore, when the fast forward/rewind button 4 is released, the operating plate 50 rotates back to its original neutral position, enters the playback mode, and the recorded content can be immediately played back.

Next, the high-speed erase operation will be explained with reference to FIG. This operation is accomplished in the stop mode shown in FIG. 2 by pressing fast forward/rewind button 4 and then pressing record button 3. Fast forward first/
By pressing the rewind button 4, the fast forward/rewind operating plate 50 rotates counterclockwise about the pin 49, as shown in FIG. 14, in the same manner as in the rewind mode. The actuating plate 66 and the switch plate 94 move to the left and downward in FIG. 14, respectively. As a result, the switch 97 is closed and the motor operates at high speed, and the rotation of the motor is transmitted to the reel shaft 84, causing the magnetic tape to run at high speed in the opposite direction. Further, by pressing the recording button 3, the recording operation plate 32 moves forward, and the lock lever 3
9 and a lock plate 23 in the forward movement position. and an erase head 46 on the recording operation plate 32.
comes into sliding contact with the running magnetic tape, erasing the signals recorded on the magnetic tape.

During this high-speed erasing operation, since the recording actuation plate 32 is moving forward, the forward actuation plate 12 is pressed through the bent pieces 106 and 107 and is moving forward. Therefore, the lock lever 60 is rotated to the non-operating position by the bent piece 64 of the operating plate 12.
This lever 60 cannot lock the actuating plate 50. However, at this time, since the engaging piece 53 of the intermediate lever 52 has entered the inside of the engaging piece 51 of the actuating plate 50 and is engaged with the engaging piece 51, the intermediate lever 52 causes the actuating plate 50 to With the fast forward/rewind button 4 locked, the magnetic tape can be erased at high speed. To cancel this high-speed erasing, press the stop button 1 and move the lock plate 23 to the 14th position.
Move it to the left in the figure. Then, the lock of the recording operation plate 32 is released. Therefore, since the actuating plate 32 moves downward in FIG. 14, the intermediate lever 52 also moves downward, the engagement of the engaging pieces 51 and 53 is released, and the locking of the actuating plate 50 is also released.
It becomes stop mode.

As described above, in the present invention, when the head is inserted normally, the head is inserted to the predetermined position in the head insertion recess, but when the head is inserted with one side and the other side swapped with each other, If the head is incorrectly inserted into the insertion recess, the stepped portion will come into contact with the other side wall of the head holding portion, which is higher in height than the one side wall, so that the head will not be inserted into the head insertion recess only halfway to the predetermined position. It was configured as follows. Therefore, if the head is inserted incorrectly as described above, the head can protrude more from the holder in the direction opposite to the direction of insertion than if it were inserted normally. Incorrect insertion can be detected extremely easily with the naked eye. Additionally, if the head is inserted backwards and the head protrudes significantly from the holder in the direction opposite to the insertion direction, it will generally be impossible to lock the operation button, and from this fact it is easy to identify incorrect insertion. be. Therefore, it becomes extremely easy to detect incorrect insertion of the head, and based on this, it becomes easy to correctly insert the head into a normal state, so that the occurrence of defective products can be reduced.

Further, in a head holding device for inserting and holding a head into a head insertion recess of a head holding part,
Since one side of the head is provided with a step facing in the insertion direction, and the other side wall of the head holding part is made higher than that one side wall, the head can be held securely in a normal state. However, the structure is extremely simple.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of a small tape recorder according to an embodiment of the present invention, Fig. 2 is a plan view showing the internal mechanism of this tape recorder, and Fig. 3 is an exploded view of the recording operation plate and its related mechanisms. Perspective view, 4th
The figure is an enlarged plan view of the same, Figure 5 is a cross-sectional view of the holding part showing the mounting mechanism of the erasing head, Figure 6 is a cross-sectional view of the holding part when the erasing head is reversely inserted, and Figure 7 is the switch plate. 8 is an enlarged plan view of the same, FIG. 9 is a plan view of the internal mechanism in the recording mode, and FIG. 10 shows the locking operation of the recording operation plate and the limiter operation of the erasing head in the same mode. FIG. 11 is an enlarged plan view of the recording operation plate; FIG. 11 is a plan view of the internal mechanism in rewind mode; FIG. 12 is a plan view of the internal mechanism in review mode; FIG.
14 is a plan view of the internal mechanism showing the operation of one-touch review, and FIG. 14 is a plan view of the internal mechanism showing the operation of high-speed erasing. The reference numerals in the drawings indicate 44...head insertion recess, 45...head holding section, 46...erasing head, 47...protrusion, and 48...stepped portion.

Claims (1)

[Claims for Utility Model Registration] A head holding device configured to hold the head in the head holding part by inserting the head into a head insertion recess formed in the head holding part, A step part facing in the insertion direction is provided on one side, and this one side wall is larger than the one side wall of the holding part that faces the step part when the head is inserted into the head insertion recess in a normal state. The other side wall of the holding portion opposite to the head is configured to have a high height, and when the head is inserted normally, the head is inserted to a predetermined position in the head insertion recess, and the head is inserted into the head insertion recess. When the head is mistakenly inserted into the head insertion recess with one side and the other side opposite to the one side swapped with each other, the stepped portion comes into contact with the other side wall which is higher in height than the one side wall. A holding device for a head configured such that the head can be inserted into the head insertion recess only halfway to the predetermined position.