JPS6023409B2 - Accidental erasure prevention device for magnetic recording and reproducing devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to either a recording/playback operation by running a magnetic tape built in a cassette at a constant speed in the forward direction, or a recording/playback operation by running the magnetic tape at a constant speed in the reverse direction. The purpose of the present invention is to provide an erasure prevention device for a magnetic recording and reproducing device that is capable of performing the following functions, and is equipped with two playback buttons, one for forward playback and one for reverse playback, and one for recording playback. To provide a mechanism to prevent erroneous recording by reliably detecting a tape cassette's forward rotation side erasure prevention tongue and reverse side erroneous erasure prevention tongue by mechanical means, and which does not hinder the mounting of the cassette. It's about trying.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the entirety of this embodiment, in which an upper substrate 2 is fixed to the upper surface of the lower substrate 1 at a predetermined interval so as to be parallel to the lower substrate 1. As shown in FIG. Between the lower board 1 and the upper board 2, there is a temporary stop rod 3, a right fast forward rod 4,
Forward playback rod 5, recording rod 6, reverse playback rod 7,
A left rapid feed rod 8 and a stop rod 9 are provided to be slidable in the direction of the arrow AB, and each of these rods is attached to the lower substrate 1.
The rods are always biased in the direction of arrow B by torsion springs 10 to 16 arranged below each rod.
At the tip of each of the above-mentioned 〇 points are a temporary stop plow 17, a left fast forward peg 18, a forward play plow 19, a recording plow 20, and a reverse play plow 0.
21, left fast forward feeder 22, and stop feeder 23 are fixed.
Further, a tape drive motor 24 and a tape counter 25 are fixed to the lower substrate 1, and reel stands 26 and 27 are rotatably supported. Due to this, the number scale of the tape counter 25 changes as the reel stand 26 rotates. On the upper substrate 2, a head substrate 30 is supported via a steel ball 31, as shown in FIG. 2, and a presser plate spring 32 is fixed at one end on the upper substrate 2.
is pressed onto the upper substrate 2 by arrow AB in FIG.
It is arranged so that it can slide freely in the direction. A recording/reproducing head 33 and erasing heads 34 and 35 are mounted on the head substrate 30. Further, a switch 36 for turning on and off the power of the motor 24 is fixed on the upper substrate 2, and its movable pocket piece 36a and fixed bushing piece 36b penetrate the opening 2a of the upper substrate 2 and protrude downward. . Furthermore, a switch 37 is fixed on the upper substrate 2 to switch between an amplifier circuit for the recording/reproducing head 33, a bias oscillation circuit for the erasing heads 34 and 35, and a tape running direction indicator lamp circuit. In addition, the head 33 has a forward rotation on the top and bottom of its front surface,
It has two types of reversal gaps, and when the tape is running at a constant speed in the forward rotation direction, the normal rotation gap is selected, and when the tape is running at a constant speed in the reverse direction, the reversal gap is selected by switching the switch 37. It has become. Along with this, regarding the erasing heads 34 and 35, the head 34 is operated during forward recording, and the head 35 is operated during reverse recording. The above is a description of the configuration shown in FIG. 1. Next, FIGS. 2 and 3 show the main parts of the tape drive mechanism, which will be explained.

A flywheel board 38 is fixed to the lower surface of the lower board 1 at a predetermined interval so as to be parallel to the lower board 1. Fixed rotation bearing 41
, 42 rotatably support capstans 43, 44. The capstans 43 and 44 are integrally equipped with capstan pulleys 45 and 46 and a flywheel 47.
, 48 are fixed. A pulley 50 is supported on the lower substrate 1 so as to be rotatable about a shaft 49, and a motor pulley 51 attached to the rotating shaft of the motor 24, the flywheels 47 and 48, and the pulley 50 are connected to the belt 5.
2, and the capstans 43 and 44 are configured to be rotated counterclockwise and clockwise, respectively, by the counterclockwise rotational force of the motor 24, as shown in FIG. Note that the upper substrate 2 has support shafts 53 and 54 shown in FIG.
Pinch roller arms 55 and 56 are attached which can freely rotate around the center of the pinch roller arms 55 and 5.
Pinch rollers 57 and 58 are attached to the capstan 6 so as to be rotatable about shafts 59 and 60, and the pinch rollers 57 and 58 are arranged so as to be able to come into contact with the capstans 43 and 44, respectively. In addition, idler levers 61 and 62 are disposed on the upper substrate 2 so as to be freely movable with the upper substrate 2 in between (see Fig. 2). , 66, and the idlers 63, 64 are arranged so as to be able to come into contact with the capstan pulleys 45, 46 and the reel stands 26, 27, respectively. The above is a description of the configuration of the main parts of the tape drive mechanism. Next, the configuration of the constant speed tape drive mechanism is shown in FIGS. 4 and 5, which will be explained.

A main regeneration rod 67 is disposed between the normal rotation regeneration rod 5 and the reverse regeneration rod 7, and this main regeneration rod 67 is also provided between the lower substrate 1 and the upper substrate 2 so as to be slidable in the direction of arrow AB. Like the rod shown in FIG. 1, it is always biased in the direction of arrow B by a torsion spring 68 arranged on the lower substrate 1. A connecting pin 69 is fixed to the main regeneration rod 67, and this connecting pin 63 passes through the barrier hole 2b of the upper substrate 2 and the opening 30a of the head substrate 30 and projects onto the head substrate 30.
A hoe 70' is attached to the head board 30, and one end has a locking piece 7.
A torsion spring 72 locked to 1 is disposed, and this spring 72
The other end engages with the outer circumferential groove 69a of the connecting pin 69 and presses the connecting pin 69 in the direction of the arrow. On the other hand, each bent piece 5 of the normal rotation regeneration rod 5 and the reverse rotation regeneration rod 7
a, 7a are the locking claws 67a, 6 of the main regeneration rod 67;
7b, and when it is in a stopped state, they can be rolled simultaneously as shown in Fig. 4. Therefore, if the normal rotating regeneration rod 5 is pressed in the direction of arrow A, the bent piece 5a
, the main regeneration rod 67 is also moved in the same direction via the locking claw portion 67a, and when the reversing playback rod 7 is pressed in the direction of arrow A, the main regeneration rod is moved through the bending piece 7a and the locking claw portion 67b. Rod 67 is also slid in the same direction. In other words, as shown in FIG. 5, during normal rotation regeneration from a stopped state, the normal rotation regeneration rod 5 and main regeneration rod 67 are activated, and during reverse rotation regeneration, the reverse rotation regeneration rod 7 is activated.
The main regeneration rod 67 moves in the direction of arrow A at the same time. When the main regeneration rod 67 slides in the direction of arrow A during forward rotation or reverse regeneration operation, the head substrate 30 also slides in the same direction via the connecting pin 69 and the torsion spring 72, and the head substrate 30 moves to the stopper pin on the upper substrate 2. 2c and can be held at a predetermined playback position. Further, by applying a force in the direction of arrow B to the head substrate 30' held at the reproduction position, the head substrate 30 can be moved in the same direction against the force of the torsion spring 72. pinch roller arm 55
, 56 are provided with regulation pins 73, 74 on their lower surfaces, and these regulation pins 73, 74 are connected to the holes 75, 74 of the head substrate 30.
It penetrates through 76 and protrudes toward the upper substrate 2 . The pinch roller arms 55 and 56 are attached to the head substrate 30.
The pinch roller arm 56 rotates around the shaft 53 under the biasing force of the ends of torsion springs 79 and 80 which are loosely connected to the shafts 77 and 78 and whose ends are locked and fixed to the locking pieces on the head board 30. The pinch roller arm 56 is biased clockwise.
is biased to rotate counterclockwise about a shaft 54. Therefore, when the forward rotation playback rod 5 or the reverse rotation playback rod 7 is pushed in the direction of arrow A and the head substrate 30 is slid in the same direction, the positions of the openings 75 and 76 are also shifted, and the pinch roller 57 is pressed against the capstan 43 or When the pinch roller 58 is able to press the capstan 44 and the normal rotation regeneration rod 5 or the reverse regeneration rod 7 and the main regeneration rod 67 are returned to the stop position as shown in FIG.
76 returns to its original position, the pinch rollers 57, 5
8 are separated from the capstans 43 and 44, respectively. The above is an explanation of the configuration of the main parts of the tape constant speed drive mechanism. This tape constant speed drive mechanism is closely related to the tape constant speed running direction switching mechanism, so-called forward/reverse rotation switching mechanism.
Next, the configuration of this switching mechanism will be explained using FIGS. 4 and 5 above.

A switching rod 8 is provided on the upper substrate 2 between it and the head substrate 30.
1 is provided slidably in the direction of arrow CD. Similarly, an F-shaped lever 83 is attached to the upper substrate 2 so as to be rotatable about a support shaft 82, and a connecting pin 84 is fixed to the lower surface of one end of this lever 83, and this connecting pin 84 is used for the above-mentioned switching. It is inserted into the deepest hole 81a of the rod 81. Therefore, the switching rod 81 and the lever 83 are designed to be interlocked. Further, the end of a torsion IJ spring 85 whose one end is loosely connected to the small hole 2a of the upper substrate 2 is connected to a small hole 83a at the end of the lever 83. It is biased to rotate in two directions: clockwise and counterclockwise. As a result, the switching rod 81 is also biased in two directions, the direction of arrow C and the direction of arrow D. The cut-out knob 37 of the switch 37 is attached to the bent and engaged concave portion 81b of the roughly cut sliding door rod 81.
A is inserted with iron, so that this switch 37 can also be switched in two directions, the direction of arrow C and the direction of arrow D. Further, a T-shaped lever 87 is attached to the substrate 2 between it and the switching rod 81 so as to be rotatable about a support shaft 86, and the upper surface of the tip of the arm formed in the middle of the lever 87 is rotatable about a support shaft 86. A connecting pin 88 is fixed, and this connecting pin 88 is inserted into the elongated hole 81c of the switching rod 81. Therefore, the lever 87 is operated via the switching rod 81 and the lever 83.
Due to the biasing force of the click spring 85, it is biased to rotate in two directions: the counterclockwise direction and the clockwise direction. Further, the tips of the two symmetrically formed arms of the lever 87 are fixed upwardly to the forward rotation playback rod 5 and the reverse playback rod 7, respectively, and penetrate through the upper substrate 2 to reach the upper surface of the upper substrate 2. It is engageable with the protruding traverse pins 88 and 89. Here, in the stopped state shown in FIG. 4, the normal rotation regeneration rod 5 and the reverse rotation regeneration rod 7 are held at the stop position.
In this state, the above-mentioned bar 87 is in contact with the operation pin 89 of the reversing and reproducing rod 7 under the biasing force of the click spring 85, and therefore this lever 87 is switched.

The head 81, lever 83, and switch 37 are maintained in one stable state, which will now be referred to as a first state (normal rotation possible state). On the other hand, when a biasing force in the opposite direction that exceeds the desired point of the click spring 85 acts, the lever 87 moves the operation pin 88 of the normal rotation regeneration rod 5.
Therefore, the lever 87, switching rod 81, lever 83, and switch 37 come to be held in another stable state, which will be referred to as the second state (reverse transfer possible state). do.

Furthermore, regulating arms 92 and 93 are attached to the upper substrate 2 so as to be rotatable about support shafts 90 and 91, and these regulating arms are disposed between the switching rod 81 and the head substrate 30. The regulating arms 92, 93 are provided with openings 92a, 93a, through which the heads 61a, 62a (see also FIG. 2) of the idler levers 61, 62 pass through and protrude upward. The heads 61a, 62a of the idler levers 61, 62 are connected to the shaft 94 of the upper board 2.
, 95, and one end of the torsion spring 96, 9 is locked.
7, the idler 63 is applied to the capstan pulley 45 and the roll stand 26, and the idler 64 is applied to the capstan pulley 46 and the roll stand 2.
7 in the direction of pressure contact. Above regulation arm 9
2 and 93, idler position adjustment parts 98 and 99 are fixed to the long holes 92b and 93b with screws 100 and 101, and these adjustment members 98 and 99 are fixed to the holes 92b and 93b when fixed. By sliding in the longitudinal direction of the idler, the idler can be fixed at any suitable position relative to the reel stand and the capstan pulley. A part of the adjustment section is the check hole 92a of the regulation arm 92 and 93.
, 93a, and said Hydraleva-61, 62
The head portions 61a and 62a of the Therefore, the master control arm 92 receives the biasing force of the torsion spring 96 through the idler lever 61 and the adjustment member 98 and is biased to rotate clockwise around the receiving shaft 90. The force is received through the idler lever 62 and the adjustment section village 99, and is biased counterclockwise around the pith 91. Regulating pins 102, 103 are fixed to the lower surfaces of one ends of the regulating arms 92, 93, and these pins 102, 103 can be engaged with the engaging protrusions 81d, 81e of the sliding sliding rod 81, respectively. . That is, the switching rod 81 is moved in the direction of the arrow C by the biasing force of the click spring 85.
In the first state where normal rotation is possible where the engagement protrusion 81e is biased and held in the direction shown in FIG.
However, since the biasing force of the click spring 85 is much larger than the biasing force of the spring 97, the regulating arm 93 is also held in the first state in which it can rotate in the normal direction, that is, it cannot rotate the supply reel stand 27. That will happen. Further, at this time, the engaging protrusion 81d is separated from the regulating pin 102, and the regulating arm 92 can be rotated clockwise around the shaft 90. Roughly switching rod 81 is indicated by arrow D
In the second state where the engaging protrusion 81e is biased in the direction and capable of reversing, the engaging protrusion 81e separates from the regulating pin 103, and the regulating arm 9
3 can rotate counterclockwise around the shaft 91, and conversely, the engaging protrusion 81d engages with the regulating pin 102, so that the regulating arm 92 can move in reverse, that is, the winding roll table 2
6 is now held in the second state in which it cannot be rotated. Regulation pins 104 and 105 are further fixed on the upper surfaces of the regulation arms 92 and 93, and these can be engaged with outer circumferential tapered green portions 106 and 107 provided on the head substrate 30, respectively.

In other words, when the cutting rod 81 is in the first state where it can run forward, the regulating arm 92 can rotate clockwise around the shaft 90, but when the head board 30 is at the stop position, the regulating arm 92 can rotate around the outer circumference of the The tapered twill portion 106 and the regulation pin 104 engage, and the regulation arm 92 is restricted from rotating clockwise.Therefore, the position of the idler 63 is also regulated via the adjustment plate 98 and the idler lever 61. In this state, the idler 63 is closed to the cap. The stamp pulley 45 is designed not to come into pressure contact with the roll stand 26. Then, as the head board 30 slides in the direction of arrow A due to the playback operation, the regulation arm 92 begins to rotate clockwise, and when the idler 63 comes into contact with the capstan pulley 45 and the reel stand 26, the regulation arm 92 rotates. Although the movement stops, the head board 30 moves forward further and when it is held at a predetermined playback position, its outer peripheral edge 106 separates from the regulation pin 104, and the idler 63 moves the capstan pulley 45 and the rail with a predetermined biasing force. It comes to be pressed against the stand 26. Further, when the switching rod 81 is in the second state where it can run in reverse, the regulation arm 93 is moved to the shaft 91.
The idler 64 can be rotated counterclockwise around the regeneration operation, and the idler 64 is pressed against the capstan pulley 46 and the roll stand 27, but the operation at this time is symmetrical with the content explained in the first state. Since the contents are exactly the same, detailed explanation will be omitted here.

Outer periphery tapered twill portion 92c formed on regulation arms 92, 93
, 93c engage with the regulating pins 73, 74 fixed to the pinch roller arms 55, 56 to prevent the pinch row arms 55, 56 from rotating clockwise or counterclockwise around the shafts 53, 54, respectively. It is for regulating purposes.

In other words, assuming that the switching rod 81 is now in the first state where it can run in the normal direction, when the regeneration operation is performed from the stopped state and the head substrate 30 slides in the direction of arrow A, the opening of the switching rod 81 as shown in FIG. 75 and 76 are also displaced, the pinch roller arms 55 and 56 are urged to rotate clockwise or counterclockwise around the shafts 53 and 54, respectively, by the urging force of the torsion springs 79 and 80. Since the regulating arm 93 is held in the first state by the biasing force of the click spring 85,
The regulation pin 74 fixed to the pinch roller arm 56 engages with the outer circumferential tapered twill portion 93c of the regulation arm 93, and as a result, the regulation arm 93 receives a counterclockwise rotating force around the shaft 91. Since the biasing force is larger, rotation of the pinch roller arm 56 is restricted in this state, and the pinch loaf 58 is held at a position away from the capstan 44. On the other hand, since the regulating arm 92 is allowed to rotate clockwise around the shaft 90, its outer circumferential tapered edge 92c also moves, and the regulating pin 73 fixed to the pinch roller arm 55 engages with the outer circumferential tapered green portion 92c. The pinch roller 57 comes into contact with the capstan 43 before the pinch loaf 57 is brought into contact with the capstan 43 with a predetermined biasing force. Furthermore, when the switching rod 81 is in the second state where it can run in reverse, the regulating arm 92 is held in the second state where the AIDRA 63 is separated from the reel stand 26 and the capstan pulley 45, causing a pinch. The regulation pin 73 fixed to the roller arm 55 is connected to the regulation arm 9
Therefore, the pinch roller arm 55 is restricted from rotating around the shaft 53, and the pinch roller 57 is held at a position away from the capstan 43, and conversely, the restriction arm 93 is Since rotation in the counterclockwise direction around the pinch roller arm 91 is allowed, the pinch roller 58 presses against the capstan 44 without engaging the outer circumferential tapered edge 93c and the regulating pin 4 fixed to the pinch roller arm 56. , Therefore, the pinch roller 58 is pushed against the capstan 4 by a predetermined biasing force.
It comes to be pressed against 4. Returning to Figure 4, the upper board 2
A conversion lever 108 is mounted on the top with a connecting pin 69 fixed to the main regeneration rod 67 as a pivot and is arranged between the upper substrate 2 and the head substrate 30, and both arms of this conversion lever 108 are used for regeneration operation. At the same time, it can come into contact with operating pins 88 and 89 fixed to the normal rotation regeneration rod 5 and the reverse rotation regeneration rod 7. That is, when the normal rotation regeneration rod 5 is operated from the stopped state shown in FIG. 4, the main regeneration rod 67 first slides in the direction of arrow A, which also causes the lever 108 to move in the same direction. If the lever 87 is in the second state where it can run in reverse, the movement of the operating pin 88 in the direction of arrow A causes the lever 87 to rotate in the direction of the rebound indicator around the shaft 86 against the force of the click spring 85. Therefore, the cutting rod 81 moves in the direction of the arrow C, the lever 83 rotates clockwise around the shaft 82, and when the click spring 85 passes the point, it is now possible to run in the normal direction due to the biasing force of the click spring 85. The state is switched to the first state. Therefore, the left tip of the lever 108 comes into contact with the operating pin 89 during its movement in the direction of arrow A, and is then rotated counterclockwise by the connecting pin 69 using the saddle that contacts the operating pin 89 as a fulcrum. The right tip follows the movement of the operating pin 88 in the direction of arrow A. Then, as shown in FIG. 5, when the main regeneration rod 67 is locked and held at a predetermined regeneration position and the pressing operation of the forward rotation regeneration rod 5 is stopped, the forward rotation regeneration rod 5 is returned by the biasing force of the imitation 12. The driver tries to return in the direction of the arrow, but the right end of the lever 108 is so close that the operating pin 88 comes into contact with it. Lever 108
receives a clockwise rotational force around the connecting pin 69 due to the return force of the normal rotation playback rod 5, but at its left end, the return force of the spring 14 of the reversal playback rod 7 and the biasing force due to the click 85 of the lever 87 are applied. The mustard bar 108, which is subjected to a counterclockwise rotational force which is a much larger force, is held in this state, and therefore the normally rotating regeneration rod 5 is also held in this state. The state described above is shown in FIG. Conversely, when the reversing regeneration rod 7 is operated from a stopped state, the lever 87, switching rod 81,
The lever 83 is held in the second state, so when the main regeneration rod 67 is locked and held at a predetermined regeneration position, the reversal regeneration rod 7 is operated with the operating pin 89 in contact with the left end of the lever 108. will be retained. Next, a case will be described in which the reversal regeneration rod 7 is operated from the normal rotation regeneration lock holding state.

When the reversing reproducing rod 7 is pressed from the normal rotation reproducing state shown in FIG. The switching rod 81 and the switching knob 37a of the switch 37 move in the direction of arrow D, and the lever 83 rotates counterclockwise about the shaft 82. Then, when the click spring 85 exceeds the consideration point, the biasing force of the click spring 85 switches to the second state. At this time, the main regeneration rod 67 and head board 30 are still held at the regeneration position, but as the lever 87 rotates clockwise around the shaft 86, the lever 108 also rotates around the connecting pin 69. The forward rotation regeneration rod 5 returned to the direction of the arrow B in response to the sliding movement of the reversal regeneration rod 7 in the direction of the arrow A, and this time, the regeneration rod 5 returned to the stop position in the opposite direction. In this state, the operation pin 89 of the reversing regeneration rod 7 is locked to the lever 108, and the reversing regeneration rod 7 is held in this state. The above is the switching operation from the forward playback state to the reverse playback state, but conversely, the switching action from the reverse playback state to the forward playback state is exactly the same as explained in the above lecture, so a detailed explanation will be provided here. is omitted. The above is an explanation of the mechanism shown in FIGS. 4 and 5, and in summary, the following operations can be performed. ■
When the normal rotation regeneration rod 5 is operated, the switching rod 81 is held in the first state in which normal rotation is possible, and at this time, the pinch roller 57 or the capstan 43 is pressed against the idler 63, and the idler 63 moves between the capstan pulley 22 and the roll stand 26. Motor 2
The rotation of step 4 puts the tape in a normal rotation playback state. At this time, the switch 37 is switched to the side that turns on the normal rotation side amplifier circuit of the recording/reproduction head 33, the bias oscillation circuit of the erasing head 34, and the normal rotation side tape running direction indicator lamp. ■ Main playback in the state of ■.

When the rod 67 is held locked, the normal rotation regeneration rod 5 is also held at the operating position. ■ When the reversing regeneration rod 7 is operated, the switching rod 81 is held in the second state where it can run in reverse, and at this time, the pinch port 58 comes into pressure contact with the capstan 44, and the idler 64 moves between the capstan booley 23 and the reel stand. 2
7, and the rotation of the motor 24 causes the tape to be played in reverse.

At this time, the switch 37 is switched to the side that turns on the inverting side amplifier circuit of the recording/reproducing head 33, the bias oscillation circuit of the erasing head 35, and the inverting side tape running direction indicator lamp circuit. ■ The main regeneration rod 67 is in the state of ■.

When the reversing rod 7 is held in the lock position, the reversing playback rod 7 is also held in the operating position. ■ When switching from the forward playback state to the reverse playback state or from the reverse playback state to the forward playback state, the switching rod 81 can be run in the forward rotation while the main playback rod 67 and head board 30 are held in the playback position. switch 37, pinch roller 57,
Compression saddle to capstan 43, 44 of 58, idler 63
, 64 to the capstan pulleys 22, 23 and reel stands 26, 27, respectively.

■ By arranging the cooking members 98, 99 on the regulating arms 92, 93, the pressure saddles on the capstan pulleys 22, 23 of the idlers 63, 6'4 and the reel stands 26, 27 and the capstans of the pinch rollers 57, 58 are It is possible to accurately synchronize the pressure contact to 43 and 44 and accurately obtain a constant speed tape drive state.

Next, FIGS. 6 to 8 show the operating mechanism, which will be explained.

In FIG. 6, on the lower board 1, below each operating rod, an operating interlocking rod 109 and a first locking plate 11 are arranged in order from the top.
0. Second lock plates 111 are provided at predetermined intervals so as to be slidable in the direction of arrow CD, and these are always biased in the direction of arrow C by tension springs 112 to 114 whose one ends are fixed to the lower substrate 1. held in place. The operation interlocking rod 109 includes, in order from the right end side in the direction of arrow C, a check hole I15 forming the oblique side 115a, a check hole 116 forming the oblique side 116a, square holes 117 to 119, and an inclined side 120.
A sardine hole 120 and a square hole 121 are provided, and the check holes 115, 116, and 12 have the same shape. Next, in the first lock plate 110, in order from the right end side in the direction of arrow C, a triangular protrusion 122a having an inclined side, an opening 122 forming a groove 122b, and a triangular protrusion 1 having a neck oblique side.
24a and a groove 124b, a triangular protrusion 125a having an oblique side and a groove 125b, a triangular protruding piece 126a having an oblique side.
The barrier hole 126 forming the groove portion 126b and the neck oblique side 127a
A check hole 127 is provided to form the projection piece 12.
The heights of 2a, 1243, 125a, and 126a are the same. Furthermore, the second lock plate 111 has, in order from the right end side in the direction of arrow C, a square hole 128, a triangular protrusion 129a having a diagonal side, a check hole 129 forming a groove 129b, a square hole 131, and an opening having a diagonal side 132a. A hole 132 is provided.

The checkpoint 129 is located directly below the checkpoint 124, and the eighth
As shown in the figure, the heights of the protrusions 124a and 129a are the same, but the positions of the grooves 124b and 129b are adjusted by a slight amount a.
They are placed offset. Further, as shown in FIG. 7, the second lock plate 111 is slidably guided by three sliding parts 111b to 111d on guide parts la to lc provided on the lower substrate 1, and the sliding parts 111b and 111c are guide part la
, lb, the sliding part 111d and the guide part lc
A predetermined gap 8 is created between the two. In the above state, the above-mentioned positional deviation a of the grooves 124b and 129b occurs. Further, 8 is set larger than a. On the other hand, the fast-forwarding rod 4, the main regeneration rod 6
7. Operation pins 138 to 142 are fixed downward to the recording rod 6, left fast forward rod 8, and stop rod 9, respectively.

The operating pin 138 is inserted into the openings 115, 122, 128, the operating pin 139 is inserted into the openings 116, 124, 129, the operating pin 140 is inserted into the openings 117, 125, the operating pin 141 is inserted into the openings 120, 126, 131, and the operating pin 141 is inserted into the openings 120, 126, 131. Pin 142 is hole 1
21, 127, and 132, respectively.
In addition, the operation interlocking rod 109 has a blocking rod 1 on its lower surface.
43 is slidably arranged. In other words, blocking rod 1
43 protrusions 143a and 143b are inserted into the square holes 181 and 119 of the operation interlocking rod 109, respectively.
18 and 119 guide the projecting pieces 143a and 143b. A tension spring 144 is applied between the operation interlocking rod 109 and the blocking rod 143.
When moving in a direction, a sliding force is applied in the same direction by the biasing force of this tension spring. Also, this blocking rod 143
An L-shaped hole 145 is formed in the hole, and an operating pin 140 fixed to the recording rod 6 passes through this hole. The operation interlocking rod 109 has a bent piece 10 at one end.
9a is formed, and this bent piece 109 is a switch 36 for turning on and off the power of the motor 24 explained in FIG.
This is for moving the movable piece 36a and bringing it into contact with the fixed piece 36b. In other words, the operation interlocking rod 10
9 is at a predetermined stop position, the new song piece 109a is separated from the movable saddle piece 36a, and therefore the movable piece 36a and the fixed contact piece 36b of the switch 36 are separated and turned off, but the operation interlocking rod 109 is moved in the direction of the arrow ◯, the bent piece 109a presses the movable piece 36a in the same direction, the movable piece 36a and the fixed piece 36b come into contact, and the switch 36 is turned on. . The configuration of the operation button mechanism has been described above, and its operation will be explained next. First, when the main regeneration rod 67 moves in the direction of arrow A during the normal rotation regeneration operation or the reverse regeneration operation, the operation pin 139 also moves in the same direction.

At this time, the operation pin 139 presses the rear oblique side 116a of the opening 116 of the operation interlocking rod 109, so the operation interlocking rod 109 is moved in the direction of the arrow ◯ against the biasing force of the spring 112, so that the operation interlocking rod 109 is bent. The piece 109a presses the movable contact piece 36a of the switch 36 in the same direction, and the movable saddle piece 36
a comes into contact with the fixed contact piece 36b, and the switch 36 is turned on. At the same time, the operating pin 139
24, the first lock plate 110'
When the operating pin 139 is moved in the direction of arrow D against the biasing force of the spring 113 and passes over the protrusion 124a, the operating pin 139 is inserted and locked in the groove 124b, and the main regeneration rod 67 is held at this position. It will be locked and will be in playback mode. On the other hand, since the operation pin 139a further presses the oblique side of the closing opening 129 of the second lock plate 111, the second lock plate 111
When the operating pin 139 is moved in the direction of arrow D against the biasing force of the spring 114 and passes over the protrusion 129a, the operating pin 139 is inserted into the groove 129b. But the third
As shown in the figure, since the position of the opening 124 of the first locking plate 110 is a slight distance a from the groove 124b, the operation pin 139 is not locked by the groove 129b, but leaves the gap a. and face each other. When the stop rod 9 is pressed in this regeneration state, the stop rod 9 moves in the direction of arrow A, and the operating pin 142 also moves in the same direction.
At this time, the operation pin 142 is inserted into the opening 1 of the first lock plate 110.
27 inclined side 127a and the check hole 13 of the second lock plate 111
Since the first lock plate 1 is pressed against the inclined side 132a of the first lock plate 1
10 and the second lock plate are moved in the direction of the arrow ◯, and the operating pin of the main regeneration rod 67 moves into the groove 124b of the first lock plate 110 and the groove 129b of the second lock plate 111.
When it comes to the point where it comes off, the locking state of the operating pin 139 is released, and the main regeneration rod 67 is returned to its original state by the force of the spring 68 and becomes stopped.

Next, the recording operation will be explained.

The recording operation is performed by pressing the recording rod 6 and the main playback rod 67 simultaneously. When the recording rod 6 and the main playback rod 67 move in the direction of arrow A, the operation interlocking rod 109 is moved in the direction of arrow ◯ as in the playback operation, and at this time, the blocking rod 143 is also pulled by the spring 144 and moves in the same direction. However, the operation pin 140 is stuck in the groove 14 of the L-shaped hole 145 of the blocking rod 143 in the direction of arrow CD.
5a and has reached the groove 145b in the direction of arrow AB, the operation pin 140 is not locked in the groove 145a, and therefore the recording rod 6 can be pressed continuously. At this time, the blocking rod 143 is in the groove portion 145b.
The operation pin 14 is held in a locked state. On the other hand, the operation pins 140 and 139 are connected to the first lock plate 110, respectively.
Since the inclined sides of the openings 125 and 124 are pressed, the first locking plate 11 moves in the direction of the arrow ◯ in the same manner as during the regeneration operation, and the operation pins 140 and 139 move into the grooves 125b, respectively.
, 124b, and both the recording and main reproduction rods are locked in this position and enter the recording state. In addition, recording letter 0
If the stop operation is performed in the state, the first lock plate 11
0 and the second lock plate 111 move in the direction of the arrow ◯, the recording rod 6 and the main playback rod 67 are unlocked and returned to their original positions by the force of the springs 13 and 68, respectively, to a stopped state. Next, the right or left fast forward operation will be explained.

When the right fast-forwarding rod 4 or the left fast-forwarding rod 8 is moved in the direction of arrow A, the operation pin 138 or the operation pin 141 also moves in the same direction, and the respective operation interlocking rods 1
No. 09 checkpoints 115, 120 oblique sides 115a, 120a
The above operation interlocking rod 1 is pressed in the same way as during playback.
09 is moved in the direction of arrow D, the switch 36 is turned on, and the motor is powered on. And at the same time the first
Since the oblique side of the lock plate 110 is pressed around the check holes 122 and 126, the first lock plate 110 moves in the direction of the arrow D as during playback, and when the operating pin 138 or 141 passes over the protrusion 122a or 126a, the groove 122b or 12
The right fast feed rod 4 or the left fast feed rod 8, which is inserted and locked in 6b, is locked in this position and enters the right fast feed or left table feed state. Note that if the stop rod 9 is pressed in these right or left fast forward states, the first lock plate 110 will move in the direction of the arrow ◯ and the right fast forward rod 4 or the left fast forward rod 8 will be unlocked, as in the case of playback. , are returned to their original positions by the force of springs 11 and 15, respectively, and come to a stopped state.

Next, the case where the recording rod 6 is pressed from the playback or right/left fast forward state will be explained. During playback or left/right fast forwarding, the operation interlocking rod 109 moves in the direction of arrow D, and the blocking rod 143 also moves in the same direction by the force of the spring 144. At this time, the operating pin 140 of the recording rod 6 is in the groove 146a of the L-shaped stopper hole 145 of the blocking rod 143 in the direction of arrow CD. Since it is locked, the recording rod 6 can be moved in the direction of arrow A. Next, a high-speed playback operation, so-called queue operation, will be explained.

When the right fast-forwarding rod 4 or the left fast-forwarding rod 8 is operated from the playback state, the movement of the operating pin 138 or 141 in the direction of the arrow A causes the lock plate 110 to move in the direction of the arrow D, as already explained during the table feeding operation. and the eighth
As shown in the figure, the operating pin 138 or 141
22a or 126a, the operating pin 139 of the main regeneration rod 67 is moved into the groove 124 of the opening 124.
b, and therefore the main regeneration rod 67
The lock caused by the first lock plate 110' is released and the main regeneration rod 67 attempts to return to the stop position, but since the second lock plate 111 has not been moved in the direction of arrow D, the second lock plate 110' is now unlocked.
The operating pin 139 is locked in the groove 129b of the locking hole 129 of the lock plate 111, and the reproduction state is maintained. In other words, the main regeneration rod 67 is moved by a slight amount a from the normal lock position.
However, even in this state, the tape constant speed drive operates normally. On the other hand, since the operation pin 139 is locked in the position returned by a distance a, even if the first lock plate 110' tries to return in the direction of arrow C, the force is very weak, so the protrusion 124a of the check hole 124
The tip of the operating pin 139 is locked in reverse. Therefore, the operating pin 138 or the operating pin 141 of the right fast-forwarding rod 4 or the left fast-forwarding rod 8 is connected to the grooves 122b and 126 of the openings 122 and 126 of the first locking plate 110, respectively.
b, and the right fast-forward rod 4 or left fast-forward rod 8 is not locked, and it is necessary to always press the right fast-forward rod 4 or left fast-forward rod 8 by hand to maintain the cue state. Of course, if this pressing force is released, the right fast-forwarding rod 4 or the left fast-forwarding rod 8 will return to the stop position, so that they will be in the regenerating state again. Here, when performing the above cue operation from the recording state, as already explained, the first lock plate 110 moves in the direction of arrow D, so the operation pin 14 of the recording rod 6 comes off the groove 125b of the river link hole 125 and starts recording. Rod 6 is unlocked,
Therefore, it is possible to shift to the above-mentioned normal cue or live state, and the configuration is such that erroneous recording will not occur due to cue operation from the recording state. By the way, when maintaining the cue state for a long time, it is inconvenient to have to press each fast-forward rod by hand for a long time as described above, and in this embodiment, in such a case, the main playback rod 6
7 and the right fast-forwarding rod 4 or the left fast-forwarding rod 8 can be locked at the same time, and this will be explained below.

When performing cue operation from the playback or recording state, as explained above, the operation pins 138 of each fast-forward rod,
Alternatively, 141 is the check hole 122, 1 of the first lock plate 110.
After getting over the 26 protrusions 122a and 126a,
The first lock plate 110 is the operating pin 13 of the main regeneration rod 67
However, in this state, the operating pins 138, 141 were locked in the square holes 128, 1 of the second lock plate 111.
31, one side 128 of this square hole 128, 131
a, 131a, but when the right or left fast-forwarding rods 4, 8 are pushed deeper from that position, the operation pins 135, 141 are moved to one side 128a, 131a of the openings 128, 131 of the second lock plate 111, respectively. It comes to be pressed.

Here, as shown in FIG. 7, the second lock plate 111, which had been pressed in the direction of arrow 8 by the return force of the main regeneration rod 67, resists the force of the right fast-forwarding rod 4. Further deep pressing causes the sliding portion 111b to rotate slightly counterclockwise about the point where it abuts against the guide portion la of the lower substrate 1 as a fulcrum. At this time, the groove 1 of the opening 129
29b is also displaced, and therefore the operating pin 13 of the main regeneration rod 67
9 is moved in the direction of arrow A, and when this movement amount becomes larger than a, the operation pin 139 separates from the protrusion 124a of the check hole 124 of the first lock plate 110, and accordingly, the first lock plate 110 Since the locking by the operation pin 139 is released, it moves in the direction of arrow C by the force of the spring 113,
The groove portion 124b is engaged with the operation pin 139, and the groove portion 122b is engaged with the operation pin 138, and the main regeneration rod 67 and the right fast forwarding rod 4 are locked with the first lock plate 110.
Queue state is preserved. On the other hand, when the left fast-forwarding rod 8 is pressed deeply, the second lock plate 111
Since the main regeneration rod 6 rotates clockwise around the magnetic point between the guide portion lb of the lower substrate 1 and the guide portion lb of the lower substrate 1, the main regeneration rod 6
7 is moved in the direction of arrow A, and the first locking plate is moved in the direction of arrow C by the force of the spring 113 to lock the main playback rod 67 and the left fast-forwarding rod 4, and the cue state is maintained. Ru. The cue state can be held locked not only by pushing the right fast-forwarding rod 4 or left fast-forwarding rod 8 deeply from the playback or recording state, but also by pressing the main playback rod 67 and the right or left fast-forwarding rods 4 and 8 at the same time. This can also be accomplished by the same operations as those described above. Next, when a stop operation is performed from the state where the cue is locked, the first lock plate 110 and the second lock plate 111 simultaneously move in the direction of arrow D, and the main playback rod 67 and the right fast-forwarding rod 4 Alternatively, the left fast-forwarding rod 8 is unlocked and returned to its original position, resulting in a stopped state.

The above is an explanation of the operation nail mechanism, and in summary, the following operations can be performed. ■ Maintaining the playback or recording state by locking only the main playback rod 67 or the main playback rod 67 and the recording rod 6 at the same time.

■ Lock only the right fast-forwarding rod 4 or only the left fast-forwarding rod 8 to maintain the right fast-forwarding state or the left fast-forwarding state.

■ Preventing the recording rod from being pressed during playback, right fast forwarding, or left fast forwarding.

■ Cue operation by pressing the right fast-forwarding rod 4 or the left fast-forwarding rod 8 and holding the pressed state by hand in the playback state.

(2) A cue operation in which only the recording rod 6 is unlocked by pressing the right fast-forward rod 4 or the left fast-forward rod 8 in the recording state, that is, the recording state is automatically returned to the playback state.

(2) Simultaneously locking the main playback rod 67 and the right fast-forwarding rod 4 or the left fast-forwarding rod 8 by pressing the right console feed rod 4 or the left fast-forwarding rod 8 after the cue operation, that is, maintaining the cue state. (2) Simultaneous locking, that is, holding the cue state, by pressing the main playback rod 67 and the right fast-forwarding rod 4 or the left fast-forwarding rod 8 at the same time.

■ Transition to the stop state by pressing the stop rod 9 in the playback, recording, right fast forward, left fast forward, or cue hold state. Next, FIG. 9 shows a fast forwarding mechanism, which will be explained.

Operating levers 148 and 149 that are rotatable around support shafts 146 and 147 are attached to the lower board 1, and torsion springs 1 are attached to the bearings of these operating levers 148 and 149.
50, I51 are played, and these springs 150,
Both ends of 151 are locked to the operating levers 148, 149, and only the lengths 150a, 151a thereof protrude to the outside of the operating levers. On the other hand, right fast feed rod 4, left fast feed. The length of the torsion springs 150 and 151 is 15 at the end 8.
0a, 151a are provided with bent pieces 152, 153, and when the right fast-forwarding rod 4 or the left fast-forwarding rod 8 is moved in the direction of arrow A, the above-mentioned bending pieces 152, 1
53 are the most branches 150a, 15 of the torsion springs 150, 151
1a, this torsion spring 150, 15
The operating levers 148 and 149 are rotated counterclockwise around shafts 146 and 147, respectively, by the elastic force of 1. Connecting pins 154, 155 are fixed to one ends of the operating levers 148, 149, and these connecting pins 154, 155 are connected to the bent portions of a switching rod 166 that is slidably supported on the lower board 1 in the direction of arrow CD. It is inserted into the engaging recessed pieces 157 and 158. Therefore, operating lever 1
48, 149 and the switching rod 156 are adapted to move together. In other words, if the right rapid feed rod 4 is moved in the direction of arrow A, the operating lever 148 is rotated counterclockwise around the shaft 146, the switching rod 156 is moved in the direction of arrow C, and the left rapid feed rod 8 is moved in the direction of arrow A. When moved in the direction, the operating lever 149 rotates clockwise around the pith 147, and the sliding rod 156 moves in the direction of arrow D.
Further, a cut ball slope 160 is supported on the lower substrate 1 so as to be rotatable about a support ball 159.

A torsion spring 162 is played with the pith 161 on this switching plate 160, and the right branch 162a and the left branch 1 of this spring 162
62b are the locking pieces 160a, 160 on the sliding slope 160, respectively.
b, and protrudes to the outside of the switching 160, and contacts the right inner wall 163a and the left inner wall 163b of the engagement recess 163 formed in the switching rod 156, so that the switching rod 156 moves in the direction of arrow C. When doing so, engage recess 1
Since the right inner wall 163a of the spring 163 presses the right branch 162a of the spring 162, the switching plate 160 is moved to the shaft 15 by the elastic force of the spring 162.
9 in the counterclockwise direction, and when the switching rod 156 moves in the direction of arrow D, the left inner wall 163b of the engagement recess 163 presses the left branch 162b of the spring 162, so the switching plate 160 The elastic force of 162 allows it to rotate clockwise around the axis 159. Further, a shaft 164 is fixed to the end of the switching plate 160, and a gear 166 and a pulley 166 are integrally attached to the shaft 164 so as to be rotatable.

In addition, capstan gears 167 and 168 are connected to the capstan pulleys 45 and 46, as shown in FIG.
3 and 44 are fixed coaxially and integrally. Pulleys 169 and 170 are integrally fixed to the winding reel cores 26a and 27a of the reel stands 26 and 27, respectively. Therefore, when the switching plate 160 rotates in all directions around the shaft 159, the gear 165 and the capstan gear 167 mesh, and the pulley 1
66 comes to be in direct contact with the boule 169. Further, when the switching plate 160 rotates clockwise around the shaft 159, the gear 1
65 and the capstan gear 168 mesh, and the Boo IJ16
6 comes into pressure contact with the pulley 170. Further, a torsion spring 172 is attached to a shaft 171 on the lower substrate 1,
The right side 172a and the left side 172b of this spring 172 are respectively latched to the stopper pieces ld and le of the lower board 1, and their tips are connected to the engagement recess 17 formed in the switching rod 156.
It is in contact with the right inner wall 173a and the left inner wall 173b of No. 3,
Therefore, the right branch 172a of the spring 172 is switched.

The left branch IT2b is configured to bias the rod I56 in the direction of arrow D, and the left branch IT2b bias the switching rod 156 in the direction of arrow C.
As described above, the right branch 172a and the left branch 172b are connected to the switching rod 1 while being engaged with the engagement pieces ld and le of the lower substrate 1.
56 in opposite directions with the same force, the switching rod 156 is held in this position.
At this time, the aforementioned switching plate 160 is moved to the neutral position, that is, the gear 165 via the spring 162, to the capstan gear 167,
168, the pulley 166 moves away from the pulleys 169 and 17.
The operating lever 1 is held at a position away from 0, and the operating lever 1
The most branch 1 of springs 150, 151 supported by 48, 149
50a and 151a are bent pieces 15 of the right table feed rod 4, respectively.
2. It is held at a position away from the bent piece 153 of the left fast-forwarding rod 8. Further, a switch 174 is fixed to the bottom surface of the lower substrate 1, and this switch 1
The switching knob 174a of 74 protrudes upward through the lower substrate 1 and is inserted into an engagement recess 175 formed in the switching rod 156, so that this switch 174
When the right fast forwarding rod 4 is moved in the direction of arrow A from the neutral position where the switching rod 156 is held by the spring 172, the switching rod 156 is moved in the direction of arrow C via the operating lever 148 and the switching rod 156. Furthermore, when the left fast-forwarding rod 8 is moved in the direction of arrow A, it can be switched in the direction of arrow D via a spring 151, an operating lever 149, and a switching rod 156.

This switch 174 is used to operate a tape running direction indicator lamp circuit and a so-called meeting circuit that lowers the playback output by a predetermined level during cue operation, and the circuit diagrams thereof are shown in FIGS. 10 and 11. Since it is necessary to explain the queue operation before explaining this, the configuration of the queue operation will be explained again with reference to FIG. 9. Control levers 178 and 179 are provided on the lower board 1 and are rotatable about support shafts 176 and 177.
Torsion springs 180, 181 are loosely attached to the bearings 78, 179, both branches of the springs 180, 181 are locked to the control levers 178, 179, and the long branches 180
Only the control levers a and 181a protrude to the outside of the control levers 178 and 179.

On the other hand, the right fast-forwarding rod 4 and the left fast-forwarding rod 8 are provided with new music pieces 182 and 183 opposite to the long branches 180a and 181a of the torsion springs 180 and 181, and the right fast-forwarding rod 4 or the left fast-forwarding rod 8 is indicated by the arrow A. When the bent pieces 182 and 183 are moved in the direction, the torsion spring 180
, 181, the elastic force of the torsion springs 180, 181 causes the control levers 178, 179 to rotate counterclockwise and clockwise around the shafts 176, 177, respectively. It has become. Returning to FIGS. 4 and 5, control pins 184 and 185 are fixed to the lower surface of the head substrate 30 near its center, and these control pins 184 and 185 are switched.

A pad 81 passes through the upper substrate 2 and protrudes below the upper substrate 2, and is attached to one arm portion 1 of the control levers 178, 179.
It faces 78a and 179a. The control pins 184 and 185 are located away from the arms 178a and 17.9a of the control lever when the head board 30 is at the stop position, but when the head board 30 is at a predetermined position as shown in FIG. When held at the playback position, the arm portions 178a,
179a, the right fast feed rod 4 and left fast feed rod 8 are moved in the direction of arrow A, and the control levers 178 and 179 are rotated counterclockwise and clockwise around shafts 176 and 177, respectively. When doing so, the arm portions 178a, 1
79a assists the control pins 184 and 185 to press them in the direction of arrow B. and springs 180, 18
Since the elastic force of the spring 72 is greater than the elastic force of the spring 72, the head substrate 30 is moved in the direction of the arrow B against the force of the spring 72. The control levers 178 and 179 move the arm portion 1 when the head substrate is moved by a predetermined amount in the direction of arrow B.
The tips of 78a and 179a are designed to engage with a stopper 186 provided on the lower substrate 1, and therefore, after this engagement, fast forward to the right. Continued movement of the left table feed rod 8 in the direction of arrow A is prevented by the elastic force of springs 180 and 181. That is, the head substrate 30 is moved in the direction of arrow B by the movement of the right fast-forwarding rod 4 and left fast-forwarding rod 8 in the direction of arrow A, but after moving by a predetermined amount, the amount of movement of the right fast-forwarding rod 4 and left fast-forwarding rod 8 is It is configured to be held in a fixed position regardless of the location. Here, the first case where the head substrate 30 moves in the direction B by a predetermined amount
The explanation will be given by returning to FIG.

As the head substrate 30 moves in the direction of arrow B, the recording/reproducing head 33 also moves in the same direction, but the amount of movement is constant, and in this state the head 33 is still in contact with the cassette tape.

Therefore, if the tape is fed at high speed in this state, the head 33
A so-called cue sound is played through the . Further, as the head substrate 30 moves in the direction of arrow B, the outer peripheral edge 106 of the head substrate 30 is moved to the regulating pin 104 in the case of normal rotation playback.
Since the control arm 92 contacts and presses, the control arm 92 rotates counterclockwise around the shaft 90. As a result, the idler 63 is moved approximately in the direction of the arrow ○ via the regulation arm 92, the adjustment member 98, and the idler lever 61, and is separated from the capstan pulley 45 and the rill stand 26. Also, pinch roller 57
is moved approximately in the direction of arrow B via the outer peripheral edge 92c of the regulating arm 92, the regulating pin 73, and the pinch roller arm 55, and is separated from the capstan 43. Therefore, tape constant speed drive is released. Also, during reversal playback, the regulating arm 93 is moved by the movement of the head board 30 in the direction of arrow B.
Through this, the dragr 64 is separated from the capstan pulley 46 and the reel stand 27, and the pinch roller 58 is also separated from the capstan 44, and the constant speed drive of the tape is released.

Next, the tape running direction indicator lamp circuit and muting circuit shown in FIGS. 10 and 11 will be explained.

FIG. 10 shows a tape running direction indicator lamp circuit, in which a voltage of 10 B is always applied to one end of a forward direction indicator lamp 187 and a reverse direction indicator lamp 188, which are mounted on the tape recorder body so as to be visible from the outside. The terminal is connected to switch 37 and switch 174.

As already explained in FIGS. 1, 4, and 5, the switch 37 is configured to switch between two states depending on the direction in which the tape is driven at a constant speed. When the switching rod 81 is in the second state, that is, when the forward rotation reproduction is possible, the contact 1 side of the switch 37 is connected, and when the sliding sliding rod 81 is in the second state, that is, when the reverse rotation reproduction is possible, the lower side of the switch 37 is connected. There is.

On the other hand, as already explained, the switch 174 has three states: when the right and left fast-forward rods 4 and 8 are at the stop position, when the right fast-forward rod 4 is pressed, and when the left fast-forward rod 8 is pressed. It is designed to switch between 1, 0, and m accordingly. That is, when the right and left rapid feed rods 4 and 8 are at the stop position, the contact 1 side of the switch 174 is connected, and when the right rapid feed rod 4 is pressed, the contact 0 side of the switch 174 is connected, and the left rapid feed rod 8 is connected. When is pressed, the contact m side of the switch 174 is connected. Therefore, when the right and left fast-forwarding rods 4 and 8 are at the stop position, the switch 174 and the switch 37 are connected, so if forward rotation regeneration is performed, the 1 side of the switch 37 is connected, and the forward rotation direction indicator lamp is energized. If you perform reverse playback, switch 37 is set to D.
The two sides are connected, and the reverse direction indicator lamp 188 is energized. When the right fast-forwarding rod 4 is operated, the tape is fed at high speed in the same direction as the normal playback direction, but since the switch 174 has its contact RO side connected, the switch 37 has either contact 1 or 0 connected. Even if it is
The forward rotation direction indicator lamp 187 is now energized. Similarly, when the left table feed rod 8 is operated, the tape is fed at high speed in the same direction as the reverse playback direction, but the switch 174
Since the contact m side is connected, no matter which side of the switch 37 is connected, 1 or 0, the reverse direction indicator lamp 18
8 is energized. Furthermore, in the case of the cue operation, it is clear that the same operation as in the right or left fast-forward state described above can be performed, so the explanation will be omitted.

Figure TI shows a muting circuit. This circuit lowers the playback output by a certain level when the signal on tape 189 is played back at high speed due to cue operation, making the cue sound suitable and not harsh. It is.

One end of the output state of the reproduction amplifier 190 is the external output terminal 19
1, and an external output of 10 V is taken out from this external output terminal 191. The other end is connected to the collector side of the transistor 193 through a resistor R, 192. The emitter side of this transistor 193 is grounded, and the base side is connected to one end of the above-mentioned switch 174. The voltage of the switch 174 is 1, which is open, and voltage 1, which is +B, is always applied to m. Therefore, when the right and left fast-forwarding rods 4 and 8 are at the stop position, that is, when the contact 1 side of the switch 174 is connected, no base current flows through the transistor 193, so the transistor 193 is turned off.
As for the external output, the output of the reproduction amplifier 190 can be taken out as is. On the other hand, when the right fast-forwarding rod 4 or the left fast-forwarding rod 8 is operated and the contact RO side or the contact m side of the switch 174 is connected, a base current flows to the transistor 193 and this transistor is turned on, so that the reproduction amplifier 1
The output of 90 is partially connected to the resistor R. 192, therefore, the external output 10V is supposed to be an output lowered by a certain level. The above is the explanation of the fast forwarding mechanism, and next, its operation will be explained.

First, when performing a right fast feed operation from a stopped state, when the right fast feed rod 4 is moved in the direction of arrow A, the torsion spring 150
The operating lever 146 is rotated counterclockwise around the shaft 146 through the
4 in the direction of arrow C.

At this time, the switching plate 16 is connected to the shaft 1 via the torsion spring 162.
59 in the counterclockwise direction, the gear ↓-65 meshes with the capstan gear 167, and one of them, 166, is pressed against the pulley 169. Therefore, Caff. Stun gear 1
67 counterclockwise rotation causes gear 165 pulley 166
is rotated clockwise, the pulley 169 is rotated counterclockwise, and the reel shaft 26a of the reel stand 26 winds the cassette tape at high speed in the same direction as normal playback. Further, the switching knob 174a of the switch 174 is also switched in the same direction by the movement of the switching rod 156 in the direction of arrow C.
4 is connected to the 0 side, the forward rotation direction indicator lamp 187 is energized, and the transistor 193 is turned on. During fast forward operation, there is no output from the reproduction amplifier 190, so there is no change in the external output. On the other hand, the control lever 178 is connected to the torsion spring 18
However, since the control pin 184 fixed to the head board 301 is not moving in the direction of arrow A, it is pressed and controlled by the control lever 178. The head substrate 30 remains held at the stop position. Next, when performing a left fast feed operation from a stopped state, when the left fast feed rod 8 is moved in the direction of arrow A, the operation lever 149 is moved through the torsion spring 151.
is rotated clockwise around the ratchet 147, and therefore the switching rod 156 is moved in the direction of the arrow ◯ via the connecting pin 155.

At this time, the switching plate 160 is connected to the shaft 1 via the torsion spring 162.
59 in the clockwise direction, the gear 165 engages with the capstan gear 168, and the pulley 166 engages with the pulley 170.
be brought into contact with. Therefore, the clockwise rotation of the capstan gear 168 causes the gear 165 and pulley 166 to rotate counterclockwise and the pulley 170 to rotate clockwise, and the reel shaft 27a of the reel stand 27 winds the cassette tape at high speed in the same direction as reverse playback. I'll start taking it. Further, the switching knob 174a of the switch 174 is also switched in the same direction by the movement of the switching rod 156 in the direction of arrow D, the switch 174 is connected on the m side, the reverse direction indicator lamp 188 is energized, and the transistor 93 is turned on. Become. In this case as well, there is no output from the reproducing amplifier 190, so there is no change in the external output.
On the other hand, the control lever 178 is rotated clockwise around the shaft 177 via a twisting mechanism 181, but in this case as well, the control pin 185 fixed to the head board 30 is not pressed and controlled by the control lever 179. Instead, the head substrate remains held at the stop position. Next, the cue operation will be explained.

First, when pressing the right fast forward rod 4 during normal rotation playback,
Similar to the right fast-forward operation described above, the IJ-roll stand 26 rotates counterclockwise and attempts to wind the cassette tape at high speed in the normal playback direction. On the other hand, when the head board 3 is being regenerated prior to this, it is moved in the direction of arrow A and brought to the regeneration position, so that by rotating the control lever 178 counterclockwise around the shaft 176, the control lever 178 is moved via the control pin 184. head board 30
is moved in the direction of arrow B from the playback position. However, when the controlled bar 178 is rotated by a predetermined amount, it comes into contact with the stopper 186 of the lower substrate 1 and cannot be rotated any further, so that the head substrate 30 is also held at a position where it has been moved by a predetermined amount. At this time, the regulation arm 92 is rotated counterclockwise around the shaft 90 via the regulation pin 104, and thereby the idler 63 is moved approximately in the direction of the arrow ○ via the regulation arm 92, the adjustment member 98, and the idler lever 61. The capstan 45 is moved away from the reel stand 26. Also, pinch roller 57
is moved approximately in the direction of arrow B via the restriction arm 92, the restriction pin 73, and the pinch roller arm 55, and leaves the capstan 43. Therefore, the forward rotation constant speed drive of the tape is canceled. On the other hand, since the head 33 remains in contact with the tape 189, the signal from the tape 189 is transmitted to the head 33.
Playback continues via . There is a certain timing difference between the start of the above-mentioned high-speed tape winding operation and the cancellation of the constant-speed drive, so that the high-speed tape winding operation is started after the constant-speed drive is canceled. There is. Further, since the switch 174 is switched to the D state, the forward direction indicator lamp 187 continues to be energized, and the transistor 19
3 is turned on, and the external output of the reproduction amplifier 190 is reduced by a certain level. In other words, the external output cue sound is muted and becomes a low sound, so that no harsh sound is generated. Here, a certain timing difference is provided in the switching of the above-mentioned switch 174, first the muting circuit operates, then the forward rotation constant speed drive of the tape is canceled, and then the forward rotation constant speed winding operation and the forward rotation direction are performed. The display lamp 187 continues to be energized at the same time. The above is a case in which the right fast-forward rod 4 is operated from the forward playback state to perform a cue operation, but next, a case in which the left fast-forward rod 8 is operated from the reverse playback state will be described.

In this case, the reel stand 27 rotates clockwise in the same way as in the left fast forward operation, and the tape is wound at high speed in the reverse playback direction. On the other hand, prior to this, the control lever 179 holds the head substrate 30 at a position moved by a predetermined amount in the direction of arrow B from the reproduction position. The idler 64 is rotated clockwise around the main control arm.
It is moved approximately in the direction of arrow C via the system 93, adjustment member 99, and idler lever 92, and is separated from the capstan pulley 46 and reel stand 27. Also, pinch roller 58
is moved approximately in the direction of arrow B via the regulation arm 93, regulation pin 74, and pinch roller arm 56, and leaves the capstan 44. Therefore, constant speed reversal driving of the tape is canceled. Further, since the head 33 remains in contact with the tape 189, the signal from the tape 189 continues to be reproduced via the head 33. In addition, the switch 174 is a contact point m
Since the reversing direction indicator lamp 188 continues to be energized, the transistor 193 is turned on and the external output of the reproducing amplifier 190 is muted.
In this case as well, there is a certain timing difference in the switching operation, first the muting circuit operates, then the reversal constant speed drive of the tape is canceled, and then the reversal high speed winding operation and the energization of the reversal direction indicator lamp 188 are performed. Continuations are made to occur at the same time. The above is a case in which the left fast-forward rod 8 is operated from the reverse playback state to perform a cue operation, but this time, the left fast-forward rod 8 is operated from the forward playback state and the right fast-forward rod 4 is operated from the reverse playback state. A case will be explained, but since the above-mentioned queue operation is rearranged in this case, a detailed explanation will be omitted.

When the left fast-forwarding rod 8 is operated from the forward rotation playback state, the muting circuit is first activated, then the normal saddle constant speed drive of the tape is canceled, and then the forward rotation direction indicator lamp 187 is activated at the same time as the reverse high speed winding operation starts. is de-energized and the reversal direction indicator lamp 188 is energized. Furthermore, when the right fast forwarding rod 4 is operated from the reverse playback state, the muting circuit is first activated, and then the reverse constant speed drive of the tape is canceled and the reverse direction display lamp 188 is activated at the same time as the forward high speed winding operation is started. The power is cut off, and the forward rotation direction indicator lamp 1
87 is energized. In these cases, the muted high-speed playback sound is played in the opposite direction to the constant-speed playback sound,
It becomes what is called a review sound. The above is an explanation of the fast forwarding mechanism, but to summarize it, the following operations can be performed. ■
The tape is fast forwarded in the forward rotation direction by operating the right fast forwarding rod 4, and the same direction indicator lamp is lit.

■ Fast forwarding of the tape in the reverse direction by operating the left fast forwarding rod 8 and lighting of the same direction indicator lamp.

■ Cue operation with muting and lighting of the forward direction indicator lamp by operating the right fast forward rod 4 from the forward rotation playback state. ■ Review operation with muting applied by operating the left fast-forward rod 8 from the forward rotation playback state and lighting of the reverse direction indicator lamp.

■ From the reverse playback state, by operating the right table feed rod 4,
Review operation with muting and forward direction indicator lamp lighting.

■ Cue operation with muting and lighting of the reverse direction indicator lamp by operating the left fast forward rod 8 from the reverse playback state.

Next, the accidental erasure prevention mechanism will be explained with reference to FIGS. 12 to 14.

200, 201 are shafts 202, 20 implanted in the upper substrate 2.
3 is a detection lever rotatably supported by the tape cassette 204, and is a detection lever rotatably supported by the tape cassette 204.
04a, 204b and the tongue detecting section 200a
, 201a, and bent pieces 200b, 20 at the portions facing the locking portions 6a, 6b provided on both sides of the rear end of the recording rod 6 for switching the recording/playback switch to the recording side.
1b is provided.

Further, the detection levers 200, 201 have elongated holes 200c, 201c at their front ends, and the shaft portions 20 provided at one ends of the rotating levers 205, 206 are located in the outermost holes of these holes.
4a and 206a are inserted and engaged. These rotating levers 205 and 206 are attached to shafts 207 and 208 on the upper substrate 2.
The folded piece 5a of the normal rotation playback rod 5 and the bending piece 7a of the reverse playback rod 7 are rotatably supported by the mosquito control rod.
Bent pieces 205b and 206b are provided that engage with the regenerating rods to prevent the regenerating rods from being pushed. Further, as shown in FIG. 4, the 10,000 detection lever 200 is urged to rotate counterclockwise by one end 97b of a torsion spring 97, the other end of which is loosely connected to the shaft 95. 201
is urged to rotate clockwise by one end 96b of a torsion spring 96 which is loosely connected to the shaft 94 and whose other end is locked. However, in the stopped state shown in FIG. 12, the recording rod 6 is urged in the direction of the arrow by the spring 13;
Since the biasing force of the torsion springs 96 and 97 is set larger than the sum of the biasing forces of the torsion springs 96 and 97, the detection lever 200,
201 is rotated in the direction opposite to the arrow against the force of torsion springs 96, 97, and its tongue detecting portions 200b, 201b
are the erasure prevention tongues 204a and 204b of the cassette 204.
It is held at a position slightly away from the The above is an explanation of the configuration of the intentional erasure prevention mechanism, and next, its operation will be explained.

First, as shown in FIG.
4a remains as it is, and the mistaken erasure prevention tongue piece 204 on the reverse side
It is assumed that a cassette with part b broken off and recessed part 204c opened is installed. In other words, this cassette allows recording in the forward direction, but not in the reverse direction. Then, when the recording spade 20 is pressed in the direction of the arrow, the locking portions 6a and 6b of the recording rod 6 are moved to the detection lever 2.
00 bent piece 200b, detection lever 201 bent piece 20
1b and move away from the detection levers 200, 20.
1 are rotated counterclockwise and clockwise by the biasing forces of torsion springs 97 and 96, respectively. Then, when the tongue detection part 200a of the forward rotation detection lever 20 comes into contact with the forward rotation side deletion prevention piece 204a of the cassette 204, the rotation is restricted by only a slight rotation, but the reverse rotation detection lever 201
The tongue detecting portion 201b is located in the recess 20 of the cassette 204.
It turns a lot to invade 4c. Therefore, although the bent piece 205b of the rotary lever 205 that is interlocked with the forward rotation detection lever 20 is held at a position out of the path of movement of the bent piece 5a of the normal rotation regeneration rod 5, the reverse rotation detection lever The bent piece 206b of the rotating lever 206 interlocked with the rotary lever 201 is located on the moving path of the bent piece 7a of the reversing reproducing rod 7. Therefore, the normal rotation playback button 19 can be pressed without being disturbed by anything, and the recording wholesaler 20 can be operated by pressing the forward rotation playback button 19 without any interference.
At the same time, it is locked at the pressed position and enters a normal rotation recording state. On the other hand, even if an attempt is made to press the reversed recycled gold 021, the bent piece 7a of the reversed recycled rod 7 is bent against the bent piece 206 of the rotating lever 206.
b. Since the movement is blocked by this movement, it is impossible to press it to a predetermined position, and therefore, reverse recording cannot be performed. In the above explanation, the forward playback button 19 or the reverse playback button 21 is operated after the recording peg 20 is operated, but even if the recording peg 20 and the playback button 19 or 21 are operated at the same time, the cassette 204 may be erased by mistake. Prevention tongue piece 204
Since the detection of the presence or absence of 204a and 204b is performed prior to the tape running, the erasure prevention function is reliably performed. Furthermore, even if the playback sword is operated first and the recording money 020 is then attempted to be operated, the locking structure of the operation button mechanism explained in connection with FIG. 6 prevents the operation. In other words, the structure is such that it is not possible to perform follow-up recording by switching to recording mode from the middle of playback mode. The above is an explanation of the structure and operation of the accidental erasure prevention mechanism, and the operation can be briefly summarized as follows.

■ In the stopped state, the recording rod 6 rotates normally, reverses, and both of the two detection levers 200 and 201 are held in a position where their tongue detection parts 200a and 201a are separated from the back of the cassette 204, and the cassette 204 is can be easily attached without being obstructed by the detection sections 200a and 201a.

■ When the recording nail 20 is operated, the above two detection levers 20
0 and 201 simultaneously perform a detection operation to detect the presence or absence of the tongue pieces 204a and 204b of the cassette 204.

■ When there is no yield erasure prevention tongue piece 204a on the forward side, the forward rotation playback rod 5 is prevented from being pushed by the bent piece 205b of the rotating lever 205, and the yield erasure prevention tongue piece 204 on the reverse side is prevented from being pushed.
When there is no reversing rod 7, the bending piece 206b of the rotary lever 206 prevents the reversing playback rod 7 from being pushed, making it impossible to record.

■ Even if you operate Green Sound Button 20 and then operate Recycle Money 0,
Further, even if these nails are operated at the same time, it is possible to enter the recording state, but it is not possible to operate the recording hook 20 after operating the playback button.

As explained above, the erasure prevention device of the magnetic recording and reproducing device of the present invention prevents accidental erasure by operating the recording nail, and detects the stop tab simultaneously on the forward and reverse rotation sides, and as a result of the detection, erroneous data is detected. If it is found that there is no erasure prevention piece, the corresponding playback button is prevented from being operated. According to the device of the present invention, it is possible to reliably prevent forward recording and reverse recording. Since the detection operation is not performed until the recording spade is operated, the tape cassette can be easily loaded, and has various advantages.Also, since it can be constructed by mechanical means, it can be implemented at low cost and has reliable operation. can be increased.

Furthermore, by disabling the recording plow from being operated after the reproducing plow has been operated, it is possible to completely eliminate accidental recording due to operational errors.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the entire mechanism of a magnetic recording and reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a front view of the main parts, FIG. 3 is a schematic plan view of the tape constant speed drive mechanism, and FIG. 4 5 is a plan view showing the stopped state, FIG. 5 is a plan view showing the normal rotation reproducing state, and FIG.
The figure is an exploded perspective view showing the operation button mechanism, Figure 7 is a plan view of the first lock plate, Figure 8 is an enlarged plan view of main parts showing the relationship between the first lock plate and the second lock plate, and Figure 9 is A plan view of the tape high-speed drive mechanism, FIG. 10 is a circuit diagram showing the muting circuit, FIG. 11 is a circuit diagram showing the tape running direction display circuit, and FIG. 12 is a plan view showing the state before operation of the accidental erasure prevention mechanism. figure,
FIG. 13 is an exploded perspective view of the foundation of the aircraft, and FIG. 14 is a plan view showing the lateral operating state of the aircraft. 5...Forward playback rod, 6...Recording rod, 7...Reverse playback rod, 19...
・Forward rotation playback money 0, 20...Record button, 21...
...Reverse play button, 200, 201. ．． ．． ．． ．． ．． Erroneous erasure prevention tongue detection lever, 204... ... Boop cassette, 204a, 204b ... Erroneous erasure prevention tongue piece, 20
5,206... Rotating lever. Figure 3 Ship chart N Ship diagram Dimensions Boat figure 6 Figure 7 Figure 8 Figure 10 Figure 11 Figure ○ Ship figure 12 Figure 13 Figure 14

Claims (1)

[Scope of Claims] 1. A forward rotation playback button and a forward rotation running means that causes the magnetic tape to run at a constant speed in the forward rotation direction by operating the button, and a reverse playback button and the magnetic tape being set in the reverse direction by the operation of the button. A reversing means for running the tape at high speed, a forward rotation detecting means and a reversing detecting means for detecting the forward rotation side erroneous erasure prevention tongue and the reverse rotation side erroneous erasure prevention tongue of a tape cassette containing a built-in magnetic tape, respectively, and a recording/playback changeover switch. and a recording button for switching the cassette to the recording side, and when the recording button is in the return position, the detection parts of both the forward rotation detection means and the reverse rotation detection means are separated from the cassette. a holding means that is held at the position in which the reversal regeneration button is operated; a forward rotation prevention means that interlocks with the forward rotation detection means and prevents the operation of the forward rotation regeneration button; and a forward rotation prevention means that interlocks with the reversal detection means and prevents the operation of the reverse regeneration button. A reversal prevention means is provided, and when the recording button is operated to release the operation of the holding means, the forward rotation detection means and the reversal detection means are simultaneously put into the detection operating state. An error in a magnetic recording/reproducing device characterized in that the forward rotation preventing means operates when detecting the absence of an erroneous erasure prevention tongue, and the reversing preventing means operates when the reversal detecting means detects the absence of an erroneous erasure prevention tongue. Erase prevention device. 2. The forward rotation detection means and the reverse rotation detection means each include a detection lever having a tongue detection part, and the holding means is secured to two locking parts formed on the recording rod to which the recording button is fixed, and these locking parts. The normal rotation, reverse rotation, and two detecting levers are each configured with a locking portion provided on each of the two detection levers, and a spring that biases the recording rod in the return direction. Erroneous erasure prevention of the magnetic recording and reproducing apparatus according to claim 1, which comprises a lever having a locking part movable on the moving path of the normal rotation reproducing rod and the reverse reproducing rod connected to two detection levers. Device. 3. An accidental erasure prevention device for a magnetic recording/reproducing device according to claim 1, wherein the recording button cannot be operated while the forward playback button or the reverse playback button is operated. 4 Two display means are provided to display the respective operations of the forward playback button and the reverse playback button, and the display means indicates the presence or absence of the cassette's forward rotation and accidental erasure prevention pieces during the recording operation. An erroneous erasure prevention device for a magnetic recording/reproducing device according to claim 1, which is configured to do so.