JPS6012694B2 - Tape recorder plunger control circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder plunger control circuit that is effective for use in tape recorders, particularly small cassette tape recorders such as car stereos.

When the tape wound around a cassette is left unattended, the reel hub may rotate due to vibrations, causing the tape to become loose. If a loose tape is loaded into a tape recorder and immediately played back, the tape gets wrapped around the capstan, making playback impossible, and sometimes the tape is broken. Therefore, before playback, it is necessary to rotate the reel stand to remove slack in the tape. Conventionally, this type of device rotates only one side of the reel stand to remove tape slack and electrically detects when the other reel stand begins to rotate, and when this rotation is detected, the tape enters the playback state. Therefore, it takes time to remove tape slack, and if a detection device that detects the rotation of the reel stand is also applied to a tape end detection device, it is necessary to install a special circuit to detect the start of rotation of the reel stand. Once the winding operation has been performed, the winding operation cannot be performed again at the time of playback transition after table feeding or rewinding. The present invention provides an effective plunger control circuit for use in a cassette deck designed in view of the above points.

Before explaining the circuit of the present invention, the structure and operation of a preferred cassette deck will be explained by applying this circuit. 1st~
In FIG. 12, 1 is a chassis, 2 is a motor attached to the chassis, 3 and 4 are first and second flywheels, and rotating shafts 3a and 4a are connected to a back plate 5 attached to the back of the chassis 1. The lower end is bearing, and the rotating shafts 3a, 4a
a resin bearing plate 6 whose upper part is attached to the chassis;
7. Note that the portions of the rotating shafts 3a, 4a that protrude upward from the bearing plates 6, 7 serve as capstans, and hence the rotating shafts 3a, 4a are hereinafter referred to as capstans.

Furthermore, guide holes 6a and 7a are integrally formed on the bearing plates 6 and 7, respectively, to be fitted into the guide holes of the cassette. 8
is a pulley supported on a base plate for equipping a tape stop detection unit to be described later, and this pulley 8 is iron-bonded to the above-mentioned first and second flywheels 3, 4 and the rotating shaft 2a of the motor 2. A belt 9 is wound around the pulley 2b (see FIG. 2).

Therefore, when the motor 2 rotates, the first and second flywheels 3 and 4 and the pulley 8 are rotated. 1st and 2nd above
Gears 3b, 4b are formed on the flywheels 3, 4, respectively, and control levers 10, 1 are connected to the gears 3b, 4b, respectively.
The connecting gears 10a and 11a provided in 1 are engaged with each other,
Further, the connecting gears 10a, 11a are meshed with gears 12a, 13a of the first and second reel stands 12, 13, respectively.

Therefore, when the first and second flywheels 3 and 4 rotate,
The first and second reel stands 12 and 13 each rotate in the tape winding direction.The control levers 10 and 11 have a substantially U-shape, and one end 10b, 11b is a pin l with a seam value.
The end control sections 10c and 11c supported by the terminals a and lb and tensioned by a spring 11e correspond to a head 41a of a selection arm 41, which will be described later. And the control section 10c, 1
The connecting gears 10a and 11a are pivotally supported near 1c. Therefore, the control levers 10 and 11 are connected to pins la and lb.
When rotated about the fulcrum, the connecting gears 10a, 11a move along the outer circumferences of the gears 12a, 13a of the first and second reel stands 12, 13, and the first and second flywheels 3, 4
It engages and opens with the gears 3b and 4b. Note 1
0d and 11d, the release levers 18 and 19, which will be described later, are connected to the pin l.
an engagement piece for moving the control levers 10, 11 by being engaged with them when rotated about a, lb as fulcrums, thereby releasing the engagement between the connecting gears 10a, 11a and the gears 3b, 4b. be. Reference numerals 14 and 15 designate release plungers attached to the back surface of the chassis 1, and pins 14a and 15a are installed directly on the suction punch of the release plungers and project to the upper surface through elongated holes in the chassis.

Reference numerals 16 and 17 are control levers with the pins 14a and 15a supported by the vehicle at one end, and springs 18 and 17 are connected to the chassis.
19 are installed.

Reference numerals 20 and 21 are release levers having one end pivotally supported by the other end of the operating levers 16 and 17, and approximately the center of which is a pin la of the chassis. It is pivotally supported by lb.

Reference numeral 22 designates a lock plate that is pivotally supported by a pin lc provided in the chassis, and has an upright piece 22a formed corresponding to the other end abutting piece of the release levers 20 and 21, and is attached to a head stand 24 to be described later. A lock piece 22b is formed to be engaged with the attached roller 24c.

Note that this lock plate 22 is always given a clockwise rotational force by a spring 23. Reference numeral 24 has a guide groove 24a drilled in the chassis 1 for guiding a pin ld installed therein, and a pin 24b guided in the guide groove bored in the chassis 1, which allows the head stand to move in parallel. A reproducing head 25 is attached to.

Note that in the case of a tape recorder having a recording function, the playback head 25 is used as a recording head, or a recording head is separately provided and an erasing head is attached to the head stand 24. Further, a roller 24c is provided at the tip of the head stand 24, and is engaged with the lock piece 22b of the lock plate 22 when the head stand 24 moves forward. 26, 27
is made into a pinch loaf knit, and the support frames 26a and 27a are
are supported by pins le and lf provided on the chassis 1,
Pinch rollers 26 are attached to the bracket support frames 26a and 27a, respectively.
b, 27b are rotatably mounted, and rollers 26c, 27c extending downward are also mounted, and the pin l
Winding springs 26d and 27d are provided which are wound around e and lf and have both ends engaged with support frames 26a and 27a.

Note that one end of these winding seals 26d and 27d is the head stand 24.
It corresponds to the upright pieces 24d and 24e formed at both ends of the . Further, the rollers 26c and 27c face cutouts 24f and 24g formed in the head stand 24. Reference numeral 28 denotes a selection plunger attached to the chassis, which serves to select the forward movement of the head stand and the running direction of the tape. Reference numeral 29 denotes a lever for advancing the head stand which is pivotally supported by a pin 1g planted on the back surface of the chassis, and is formed in a substantially dogleg shape, and one end of which has a fork 29b that is connected to the pin 24b of the head stand 24. They are engaged, and a pin 29a is provided at the end of the pond.

3. The control plate has an engaging pawl 30a pivotally supported on the pin 29a, and a clockwise rotational force is always applied by a coil spring 31 provided on the pin 29a. The upright piece 29c formed in
is in contact with.

A spring 32 is stretched between the other end of the forward lever 29 and the chassis 1, and applies a counterclockwise rotational force to the lever 29.

When the head stand 24 is retracted and the forward lever 29 is rotated in the anti-Japanese direction, the control plate 30 has an engaging claw 30a that engages with a pin 28a provided on the selection plunger 28. Further, when the head stand 24 is moving forward, it is retracted to a position away from the movement locus of the pin 28a. 33 is pin Ih installed in the chassis
It is a rounded lever supported on a pivot, and one end is pivoted on a pin 28a of a selection plunger 28.

A rotating arm 34 is pivotally supported by a pin li set on the chassis 1, and a pin 34a is provided as a shield at one end and extends to the back surface of the chassis 1.

Note that when the head stand 24 is retracted, the rotating arm 34 is moved by the upright pieces 24d and 24fd provided on the head stand 24.
It is in a horizontal state with this contact. Reference numeral 35 designates a swinging lever in which a pin 34a of the swinging arm 34 is passed through an elongated hole 35a, and a pin 35b, which is provided with a dowel at one end, is supported by the other end of the swinging lever 33.

Further, the other end of this swing lever 35 has two engaging claws 35c.
, 35d are formed. Reference numeral 36 designates a control arm that is pivotally supported by a pin lj provided on the chassis 1, and one end of a spring wire 37 is wound around the pin 36a provided in the shield, and approximately the middle portion passes through a hole in the upright piece 36b. The distal end thereof is inserted between two protrusions 34b formed on the rotating arm 34.

Further, the control arm 36 is provided with engaging punches 36c and 36d extending to the back surface of the chassis 1, and when the head stand 24 is moving forward, the engaging claws 35c and 36d of the swing lever 35 are
5d are engaged alternately. 38 is a torsion spring for selectively fixing the rotation of the control arm 36 in two positions.
39 is stretched between the swing lever 34 and the chassis 1, and is used to pull the lever 34 to the left.

Pin installed on the back of the 4-way chassis (not shown)
is inserted into the elongated hole 40a and moves in parallel, and an engaging punch 36d provided on the control arm 36 is engaged with a groove 40b at one end of the slide lever.

This slide lever 40 has a stepped portion 40 that comes into contact with the rollers 26c, 27c of the pinch loaf units 26, 27 to control the separation from the capstans 3a, 4a.
c, 40d, and a roller 41b of the selection arm 41, which will be described later.
, 41c to control rotation of the selection arm 41 are formed. Reference numeral 41 denotes a substantially cross-shaped selection arm whose center is pivotally supported by the pin 24b of the head stand 24 described above, and whose head 41a is the control section 10c, 11c facing the control levers 10, 11 described above. A roller 41b is located between the rollers 41b and 41b at both ends extending in the lateral direction.
41c is provided.

0 42 is a tape stop detection unit mounting plate, and the lower surface thereof includes the above-mentioned pulley 8, a large gear 43 that meshes with the gear 8a formed on the pulley IJ8, and a large gear 43 formed integrally with the large gear 43. A cam plate 44 having a gear 44a provided on its outer periphery that meshes with the small gear 43a is pivotally supported.

A cam groove 44b is formed on the upper surface of this cam plate 44, which is the surface facing the mounting plate 42, and a cam base 44c is formed in the center.
is formed. A switch 45 for energizing the selection plunger 28 is mounted on the lower surface of the mounting plate 42, and a switch control lever 46 for controlling opening and closing of the switch 45 is supported. One end of the lever 46 faces the switch 45, and the other end is pivotally supported by one end of the pin support lever 47. An engaging pin 47a facing the cam groove 44b of the cam plate 44 is formed at the other end of the pin support lever 47, and its upper end passes through the guide groove 42a of the mounting plate 42. Reference numeral 48 designates a detection arm in which a guide rod 48a is slidably inserted into a guide groove 42a, and a guide pin 48b is attached to
A sea bream is supported in the hole 42b.

Further, a forked engagement piece 48c is formed on the detection arm 48, and an engagement pin 47a of the support lever 47 is engaged with this engagement piece 48c. 49 is hole 4 drilled in the center
The detection lever 9a is supported by a pin 48d formed on the upper surface of the guide rod 48a of the detection arm 48, and long holes 49b and 49c are bored at both ends of the detection lever.

The elongated holes 49b and 49c are filled with the first and second holes.
Slip plate 12 provided on the lower surface of reel stands 12, 13
The protrusions b and 13b are engaged. This slip plate 1
2b, 13b are shaft portions 13c (first
The same applies to the reel stand 12 side, so here we will use the second reel stand 1.
Only the third side will be explained with reference to FIG. 7), and is pressed toward the plate portion 13f by the spring 13d via the felt 13e. Therefore, when no load is applied to the slip plate 13b, the slip plate 13b also rotates together with the reel stand 13;
When a load is applied to 3b, it slips and stops rotating. Note that the projections of the slip plates 12b and 13b are attached to the mounting plate 42.
It faces into the holes 42c and 42d. Reference numeral 50 is a track changeover switch whose contacts are switched in accordance with the rotation of the control arm 36 to switch the reproduction coil of the head 25, and 51 is a track changeover switch whose contacts are switched by the lever 29 for advancing the head stand when the head stand 24 moves forward. This is a switch that causes constant speed rotation, and vice versa when switched to high speed rotation.

The structure has been described above, and the operation will now be described.

When the cassette is not loaded, the head stand 24 is retracted, so the selection arm 41 is also retracted, and the control parts 10c and 11c of the control levers 10 and 11 are
It is not displaced by a.

Therefore, the connecting gear 10a is the gear 3 of the first flywheel 3.
a and the gear 12a of the first reel stand 12, and the connecting gear 11a connects the gear 4a of the second flywheel 4 and the second
It is connected to the gear 13a of the reel stand 13. When a cassette (not shown) is loaded in this state, the motor 2 is energized by a power switch (not shown).

At this point, since the head stand 24 is retracted, the motor 2 is rotated at high speed in the direction of the arrow in FIG. 2 by the contact of the switch 51. Therefore, the first and second reel stands 12, 13
are both rotated in the tape winding direction, and if there is slack in the tape, this slack is removed. Also, the reel stand 12,1
3 is rotated, the slip plates 12b and 13b are also rotated in the same direction, so that the detection lever 49 moves upward as shown in FIG. When the guide rod 48a of the detection arm 48 moves within the guide groove 42a as the detection lever 49 moves, the detection arm 48 is rotated about the guide pin 48b, so that the engagement piece 48c is moved to the right. Displace.
Since the engaging pin 47a of the support lever 47 is fitted to the displaced engaging piece 48c, the cam groove 4 of the cam plate 44
The lower end of the engagement pin 47a facing the cam groove 4b
It is pressed against the inner circumferential wall of 4b. Therefore, even if the cam plate 44 is rotated by the pulley 8, the engagement pin 47a
The engagement pin 4 does not support the engagement portion 44d of the engagement pin 4c.
7a maintains a state along the inner circumferential wall. Reel shaft portion 12c of reel stand 12, 13 from which tape slack is removed;
Since the rotation of the slip plate 13c is stopped by the friction between the reel stands 12 and 13, the rotational force of the slip plates 12b and 13b is eliminated.

Since the reel stands 12 and 13 are in a slipping state with the reel shaft parts 12c and 13c, they continue to rotate. On the other hand, cam plate 4
4 is constantly rotated by the pulley 8, so the engagement pin 4
7a is moved toward the center by the inner peripheral wall of the cam groove 44b and maintained in that state. And this moved engagement pin 4
Since the engaging portion 44d of the cam base 44c is located on the trajectory of the cam 7a, the engaging pin 47a is pushed by the engaging portion 44d. Therefore, the switch control lever 46 is rotated and the switch 45 is closed. Since this switch 45 is connected to the selection plunger 28, the plunger 28 is energized. When this plunger 28 is energized and the suction village is pulled, since the pin 28a and the engaging claw 30a of the control plate 30 are engaged, the control plate 30 is pulled and the lever 29 for advancing the head base is moved clockwise. is rotated.

Since the guide pin 24b of the head stand 24 is engaged with the forked portion 29b of this lever 29, the head stand 24 moves forward, and the roller 24c provided at the tip engages with the lock piece 22b of the lock plate 22. be done. Therefore, even after the power to the selection plunger 28 is cut off and the suction village is restored,
The head stand 24 is fixed in the forward position. Note that when the head base advancement lever 29 is rotated, the control plate 30 is rotated toward the upright piece 29c by the coiled spring 31, so the engaging claw 30a leaves the trajectory of the pin 28a of the plunger 28. Therefore, when the head stand 24 is moving forward, even if the plunger 28 is energized again, the pin 28a and the engaging pawl 30a will not be engaged with each other. On the other hand, when the head stand 24 moves forward, the rollers 2 of the pinch low units 26 and 27
6c, 27c are disengaged from the notches 24f, 24g of the head stand 24, and the coiled springs 26d, 2 are released from the middle of forward movement.
When one end of the pin 7d is pushed by the upright pieces 24d and 24e, the respective pinch loaf units 26 and 27 are rotated toward the capstans 3a and 4a by spring force.

Here, if the slide lever 40 is moving to the right as shown in FIGS. 5 and 10, the roller 26c of the pinch loaf unit 26 will be moved to the stepped portion 40c of the slide lever 40, and the roller 41b of the selection arm 41 will be moved to the stepped portion 40e. Since they are in contact with each other, the spreading of the pinch roller 26 is stopped midway, and the pinch roller 26b does not assist the capstan 3a.

Further, the selection arm 41 is rotated counterclockwise to
a contacts the control portion 10c of the control lever 10 and moves it, so that the connecting gear 10a and the gear 3 of the first flywheel 3
Remove the mesh with b. On the other hand, since the roller 27c on the side of the pinch loaf unit 27 is located away from the stepped portion 40d of the slide lever 40, rotation of the pinch loaf unit 27 is not prevented, and therefore the pinch roller 27b is pressed against the capstan 4a. be done. Also, the head 41a of the selection arm 41
Since the control portion 11c of the control lever 11 does not come into contact with the control portion 11c of the control lever 11, the gear 4b of the second flywheel 4 and the gear 13a of the second reel stand 13 continue to be connected by the connecting gear 11a. Further, since the head stand advancement lever 29 switches the switch 51, the motor 2 rotates at a constant speed. As a result, the head 25 comes into contact with the tape and begins to rotate in the direction of winding the second reel stand 13 and the tape, and the tape is pinched between the capstan 4a and the pinch roller 27b, thus starting reproduction.

Next, a case will be described in which the playback progresses and the tape reaches its end.

If the tape is now wound on the second reel stand 13 side,
The slip plate 13b of the second reel stand 13 applies a clockwise rotational force to the detection lever 49, and the slip plate 12M of the first reel stand 12 also applies a clockwise rotational force.

Therefore, the detection arm 48 is rotated clockwise, and the engagement pin 47a of the pin support lever 47 is engaged with the cam groove 44b of the cam plate 44.
It maintains a state along the inner circumferential wall of the cam base 44c and is not engaged with the engaging portion 44d of the cam base 44c. Now, the running of the tape has stopped and the reel shafts 1 of the first and second reel stands 12 and 13
2c, 13c stop, the IJ reel shaft portions 12c, 1 of the reel stands 12, 13 are removed after removing the tape slack described above.
3c is stopped, the switch 45 is closed and the selection plunger 28 is energized.

When the plunger 28 is energized and the suction punch is pulled, the rotating lever 33 is rotated clockwise. Note that since the head stand 24 is moving forward, the control plate 30 is not connected to the engaging claw 30a.
is retracted from the locus of the pin 28a, so the head stand advancement lever 29 is not rotated. Here, the slide lever 40 has moved to the right, and the groove 40 of this
Since the control arm 36 with which the engagement ring 36d is engaged is rotated counterclockwise, the rotation arm 34 is rotated clockwise via the spring wire 37. The bridge lever 35, in which the pin 34a of the rotating arm 34 is inserted into the elongated hole 35a, is rotated clockwise, and the engaging claw 35d is engaged with the engaging village 36d of the control arm 36. Therefore, when the rotating lever 33 is rotated clockwise and the swing lever 35 is pulled, the control arm 36 is rotated clockwise. As a result, the slide lever 40 moves to the left as shown in FIG. 11, and the roller 2 of the pinch loaf unit 27
7d rides on the stepped portion 40d, and the roller 41c of the selection arm 41 rides on the stepped portion 40f. Therefore, the pinch roller 27b is separated from the capstan 4a, and the control portion 11c of the control lever 11 is pushed by the head 41a as the selection arm 41 is rotated clockwise, and the connecting gear 11a is moved to the second flywheel. 4, and the rotational force to the second reel stand 13 disappears. On the other hand, I'm in a pinch. - Since the roller 26d of the unit 26 is removed from the stepped portion 40c, the pinch roller 26b is pressed against the capstan 3a, and since the head 41a of the selection arm 41 is separated from the control portion 10c of the control lever 10, the connecting gear 10a is moved from the first fly. The gear 3b of the wheel 3 and the gear 12a of the first reel stand 12 are connected. This causes the tape to start running in the opposite direction, and the rotation of the control arm 36 switches the contacts of the switch 50 to change the channel of the head 25, so that tracks in the opposite direction are reproduced. By the way, in the above state, the control arm 36 is rotated clockwise and the rotation arm 34 is rotated counterclockwise by the spring wire 37, so the swing lever 35 is rotated counterclockwise. Thus, the engagement claw 35c is held in an engageable state with the engagement village 36c of the control arm 36.

Therefore, when the playback is finished again and the stop of tape running is detected by the same operation as described above and the selection plunger 28 is energized, the swinging lever 36 rotates the control arm 36 counterclockwise to move the slide lever 40. Pull it to the right, so
The above-mentioned initial state is reached and playback in the original direction is started. If you want to change the playback channel during playback, you can close the switch using a libray button (not shown) and energize the selection plunger 28.
Reproduction in the reverse direction becomes possible by an operation similar to the operation after detecting the end of the tape.

Next, a case will be described in which rewinding is performed during playback shown in FIG. 10, that is, during playback when the tape is being wound rightward.

When you press the rewind plow (not shown) and close the switch,
The release plunger 5 is energized and its suction village is pulled.

As a result, the operating lever 17 is pulled against the spring force of the spring 19, and the release lever 21 is rotated counterclockwise.
The tip of the spring 2
It rotates counterclockwise against the spring force of step 3. Therefore, the lock piece 22b is unlocked from the roller 24c of the head stand 24, and the spring 32 is released via the head stand advancement lever 29.
It moves backwards with the spring force. Further, since the release lever 21 is rotated counterclockwise, the engagement piece 11d of the control lever 11 is engaged with the release lever 21 and rotated, and the connecting gear 11a is separated from the gear 4b of the second flywheel 4, and the engagement piece 11d of the control lever 11 is engaged with the release lever 21 and rotated. 2 reel stand 13
becomes free. On the other hand, the control section 1 of the control lever 10
0c is released from the restriction by the head 41a of the selection arm 41 that retreats as the head stand 24 retreats, so it returns to its original position by the spring force of the spring 11e and connects the connecting gear 1.
0a connects the gear 3b of the first flywheel 3 and the gear 12a of the first reel stand 12. Further, the head stand 24 is moved backward, the head stand advance lever 29 switches the switch 51, and the motor 2 rotates at high speed. Therefore, the 11th J-roll stand 12 rotates at high speed and winds up the tape. When the rewinding of the tape is completed and the end of the tape is reached, the switch 45 is closed by the same operation as the one described above after detecting the end of the tape, the selection plunger 281 is energized, and the release plunger 5 is energized. is cut off, and the head stand 24 is turned off again.
is advanced and playback is performed, but at this time, playback is performed in the direction that was being played before rewinding.

This allows the rotating arm 34 to move when the head stand 24 is retracted.
The upright pieces 24d and 24f keep the swinging lever 3 in a horizontal state.
5 is in a horizontal state so that the engaging claws 35c, 35d do not engage with any of the retainers 36c, 36d of the control arm 36. Further, when returning to playback during rewinding, the power supply to the release plunger 5 is cut off by operating a replay button (not shown) or the like.

As a result, the operating lever 17 is returned by the spring 19 and released, and the bar 21 is returned.
returns to its original position. Therefore, the connecting gear 11a is connected to the gear 4b of the second flywheel 4 and the gear 13a of the second reel stand 13.
Since the second reel stand 13 rotates in the opposite direction to the first reel stand 12, if there is slack in the tape,
Remove slack. When the slack is removed, the head stand 24 is moved by the same operation as when loading the tape described above.
advances, and playback is performed in the playback direction before rewinding. Next, a case will be described in which fast forwarding is performed during playback, that is, during playback when the tape is being wound in the right direction. When the desk advance button (not shown) is pressed and the switch is closed, the release plunger 4 is energized, and after the entire tape has been rewound, the release plunger 4 is energized. 1. The second reel stands 12 and 13 rotate in the tape winding direction, respectively, and playback in the fast forward direction is started.

However, since the tape is all wound in the fast forward direction, actual playback is not performed and the tape is stopped. Thereupon, the tape end detection operation is performed, the switch 45 is closed, and the selection plunger 28 is energized, so that the playback progresses and the tape end is reached and playback is performed in the opposite direction by the same operation as described above. Reproduction is started in the reverse direction. Next, to explain about ejecting the cassette, when you operate the eject lever (not shown),
First, the lock plate 22 is rotated counterclockwise using the ejection lever. After unlocking the head stand 24, the cassette is ejected and the power is turned off, ending the entire operation. In the above embodiment, the power switch is turned on when a cassette is loaded, but the power switch can be provided separately and turned on manually. The first and second reel stands 12, 13 are rotated in the winding direction, and the tape is rolled.

In this example, the selection plunger 28 is energized to perform playback when it detects that the slack has been removed and the rotation of the reel shafts 12c and 13c has stopped. 28 may be energized,
Alternatively, electricity may be applied by detecting the tension of the tape. Further, in the above embodiment, the gears 3b, 4b of the first and second flywheels 3, 4 are connected by the connecting gears 10a, 11a from the beginning.
Although shown as connecting the gears I2a and 13a of the first and second reel stands, it is also possible to connect them after the cassette is loaded.

Next, a plunger control circuit for controlling the deck section of the tape recorder having the above configuration will be explained.

This control circuit can be easily integrated into an IC, and can also be used to control the cassette deck using a feather-touch push switch. {2) Preset buttons on the electronic preset tuner can be shared. {3' Even if two or more operation buttons are pressed, only the first button pressed will operate. It has features such as not malfunctioning even if you keep pressing the 4-button. In FIG. 13, S and S5 are respectively linked to preset tuning buttons of an electronic preset tuner (not shown).

Among the switches, switches S2 to S4 also serve as switches for controlling the deck section. S6 is a tuner and cassette deck operation selector switch which is switched when a cassette is inserted or removed, and in the illustrated state, the cassette deck is in operation. S7 is a switch interlocked with the above-mentioned switch 51, and the head is also in the state shown in the figure in the forward position. S8 is a normally open switch corresponding to the switch 45 described above, and is turned on and off at the end of the tape. L-L3 are lamps for lighting the channel selection buttons B2-B4 corresponding to the switches S2-S4 as shown in FIG. 14 while the cassette deck is in operation. ○, ~G26 are inverters, OR gates, AND gates, NOR gates, NA
It shows an ND gate or just a gate. Among these, inverters G, . ~G,3 is one of the buttons 8~&, for example, when the button & is pressed, the other two AND gates ○9,G,. I am trying to make it not work. Gate ○ again. 4 to G, 7 will be described later. If all three of the play button and fast forward/rewind button are pressed at the same time, and the cassette deck is in fast forward or rewind state, then the operation button is released for the first time, the play operation will start. Since it is uncertain whether the playback will be fast-forwarded or rewinded, the purpose is to provide a time delay so that the play operation takes priority in this case. F, ~
F3 is a J-K flip-flop, and since the J input is at H level and the K input is at L level, the Q output goes to H level at the rising edge of the CK input, and the Q output returns to L level at the rising edge of the CL input. The Q output operates opposite to the Q output.Q, ~Q3 are the plungers 14 and 1, respectively.
5, 28 driving transistors, R,,C,,C2,
D is a resistor, a capacitor, and a diode, respectively.
Note that the resistor R, capacitor C, is a flip-flop F.
3 constitutes a time constant circuit for monostable operation. In the plunger control circuit configured as described above, when the switch S6 is currently in the ON state, that is, when the tuner is operating, one input terminal of the AND gates G3 to G7 is at H level, and any one of the switches S, to S5 is turned on. Outputs T, ~T5 are output to the corresponding gates G3~G7,
Preset tuning of the tuner is performed.

On the other hand, AND gate OB~G. One input terminal of o has an invar.
Since an L-level signal is applied via G2, even if the switches S2 to S4 are N, the AND gates G8 to G,.
There will be no more output. When a cassette tape is inserted in this state, the power is turned on to the cassette deck as described above, and at the same time the switch S6 becomes in the state shown.

Therefore, one end of the lamps L to -- is grounded through the gate ○, and the lamps are turned on. Also, since the input terminal of inverter ○2 is grounded, AND cables 03 to G7 are connected to switches S, to
It does not output regardless of whether S5 is ON or OFF, and on the other hand, AND gates G8 to G,o input the H level output of inverter Y2 to one input terminal, so switches S2 to S4
It becomes ready to output by pressing . At this time, the CK inputs of the flip-flops F, F2 are at the L level, and the switch S7 is turned on because the head stand is still in the retracted position, so the output of the NOR gate G22 is at the L level. If the cassette is inserted too slowly, the slack in the tape is absorbed by the operation described above, and the switch S
The switch S8 corresponding to 45 is turned on.

Then, the OR gate G outputs an L level, and the NAND gate ○25 outputs an H level. As a result, the flip-flop F3 operates, the Q output is inverted to the H level, and the Q output is inverted to the L level, and the plunger 28 is excited via the transistor Q3. On the other hand, the charge in the capacitor C2 that had been charged by the Q output is discharged via the resistor R.
Then, after a certain period of time after the start of discharge, inverter G26 switches to CL.
An H level output is applied to the input terminal, the flip-flop F3 is restored, and the plunger 28 completes a series of operations and is demagnetized.
As a result of this operation of the plunger 28, the head stand 24 of the cassette deck moves forward as described above to play in a predetermined direction, and the switch S7 becomes open as shown. When the tape reaches the end during the play operation, the tape end detection mechanism operates as described above and the switch S8 is turned ON again, but here too, the output of ○24 becomes L level and the flip-flop F3 excites the plunger 28 for a certain period of time. The operation is the same as above.

However, it goes without saying that this excitation initiates a play operation in the opposite direction. Play button B3 during play operation
When is pressed, the switch S3 turns ○N and the output of the AND gate G9 becomes H level.

Therefore, the output of inverter ○2 becomes L level and N
The output of OR gate G22 becomes H level, and the output of NAND gate G23 is set to L level, making NAND gate ○25
The plunger 28 is excited for a certain period of time by setting the output to H level. This excitation causes the tape running direction to be reversed as described above. To fast-forward during a play motion to the right, press the fast-forward button B4.

Then, the switch S4 becomes ○N, the H level output of the AND gate G,o is applied to the CK input of the flip-flop F2, its Q output becomes H level, and the plunger 4 is excited via the transistor Q2. This excitation state is maintained by the Q output even after the switch S4 is opened. During this fast-forward operation, the Q output is outputted via the OR gate G, and the tape output is muted to prevent unnecessary noise from being emitted. Note that the diode D, capacitor C
, makes the start of muting faster but slows down the recovery. When the end of the tape comes during fast forwarding, the switch S8 turns ○N and the plunger 28 is excited, as described above, but in this case, the Q output of the flip-flop F3 is connected to the CL input terminal of the flip-flop F2 by the OR gate G,
9, the flip-flop F2 is restored and the plunger 14 is demagnetized.

This switches to the play operation, but in this case the play operation is attempted to start in the same direction as the fast forward direction. However, since it is the end of the tape, the switch S8 is turned ON again, the plunger 28 is energized, and the tape feeding direction is reversed, so that normal play operation does not begin. Note that the plunger 28 is re-energized when the flip-flop F3 is restored and S8 becomes ○N again. When rewind button B2 is pressed during fast forwarding, switch S2 turns ○N and AND gate G
At the same time, the flip-flop F2 is restored by the H level output of 8 through OR gates G and 9, and at the same time, the flip-flop F operates and the Q output becomes H level, and the plunger 15 is excited through the transistor Q, thereby starting the tape. Rewinding is performed in the same manner as described above. Also, if you press the IJ play button & during rewinding or fast forwarding, switch S3 will turn ○N and the H level output of AND gate G9 will turn OFF.
Either of the flip-flops F, F2 is restored via the R gate GB or G, 9, tape slack is removed as described above, the plunger 28 is activated, and the tape immediately before the fast forward operation stored in the device is restored. A play motion is started in the feeding direction.

Note that during fast forwarding or rewinding, the head stand 24 moves back and switch S7 is set to ○N, so switch S3 is set to ○N.
However, the output of the NOR gate 022 still maintains the L level, and the plunger 28 is not excited. The plunger control circuit of the tape recorder of the present invention described above operates each plunger via a flip-flop that operates at the rising edge of the input using the replay button and the fast forward or rewind button, and also operates a switch that is turned on and off when the end of the tape is detected. Since the flip-flop is activated by the operation to excite the plunger and the flip-flop for fast forwarding or rewinding is reset at the same time, no matter which one of the switches S2 to S4 is held down, only one operation is performed.
, S4 is pressed and the end of the tape is reached, the switch S8 is turned on and the plunger for fast forwarding or rewinding is magnetized, and at the same time the plunger 28 is operated to perform a predetermined play operation.

Note that if the end of the tape is reached with switch S3 held down, switch S
8 changes from ON to OFF, the plunger 28 operates. In addition, as mentioned above, the cassette deck can be controlled using the feather touch push switch, and it can also be used as the preset button of the electronic brisset tuner, and it can be easily integrated into an IC.
Considering both cost and speed, as well as ease of operation, it is effective for use in automobile audio equipment.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the entire tape recorder, Fig. 2 is a perspective plan view seen from the chassis, Fig. 3 is an exploded perspective view, Fig. 4 is a plan view of the head stand drive part showing the playing state, Fig. 5. 6
The figure is a plan view of the part that changes the running direction of the tape when the head is in an advanced state, Figure 7 is a central vertical sectional view of the reel stand,
, Figure 9 is Tef. 10 is a perspective plan view of the end detection portion; FIG. 10 is a plan view of the leftward playback state; FIG. 11 is a plan view of the rightward playback state;
13 is a plan view of the plunger control circuit of the present invention, and FIG. 14 is a plan view of the operation button. 1... Chassis, 2... Motor, 3, 4...
...First and second flywheels, 10, 11... Control levers, 12, 13... First and second reel stands, 14
, 15... Release plunger, 16, 17...
Operation lever, 20, 21...Release lever, 22...
・...Lock plate, 24...Head stand, 26, 27・
...Pinch loaf unit, 28...Plunger for 0 selection, 29...Lever for advancing the head stand, 30
... Control plate, 33 ... Rotating lever, 34
...Rotating arm, 35... Swinging lever, 3
6... Control arm, 40... Slide lever,
41... Selection arm, 42... Unit mounting plate, 43... Large gear, 44... Cam plate, 45, S8
, 50, 51...Switch 46...Switch control lever, 47...Pin support lever 48
...Detection arm, 49...Detection lever, S, ~
S5...Switch, L~L3...Lamp, B~
B...Operation button, F,~F3...Flip-flop circuit, T,~T5...Preset tuning output. Figure l Figure 7 Figure 2 Figure 8 Figure 3 Figure 9 Figure 4 Figure 5 Figure 6 Or Figure 13 Figure l0 Figure 14 Figure 11 Figure '2

Claims (1)

[Claims] 1. A monostable flip-flop circuit that operates on the rise of a signal caused by pressing the replay button and the replay button, a bistable flip-flop circuit that operates on the rise of a signal caused by pressing the fast forward or rewind button, and A plunger operated by the output of the stable flip-flop circuit to switch the tape feeding direction or advance the head base, a plunger for fast forward or rewind control operated by the output of the bistable flip-flop circuit, and a plunger operated by detecting the end of the tape. A plunger control circuit for a tape recorder, comprising: a switch for operating the monostable flip-flop circuit; and a reset input circuit for applying the output of the monostable flip-flop circuit to a reset input terminal of the bistable flip-flop. 2. A monostable flip-flop circuit that operates on the rising edge of a signal caused by pressing the replay button and the replay button, a bistable flip-flop circuit that operates on the rising edge of a signal caused by pressing the fast forward or rewind button, and an output of the monostable flip-flop circuit described above. A plunger that operates to switch the tape feeding direction or advance the head stand, a plunger for fast forward or rewind control that operates based on the output of the bistable flip-flop circuit, and a plunger that detects the end of the tape and turns on and off. a switch for operating the flip-flop circuit; a reset input circuit for applying the output of the monostable flip-flop circuit to the reset input terminal of the bistable flip-flop; A gate circuit is provided to operate the plunger by outputting an output to the input, and when the replay button is pressed and the end of the tape is reached, the output of the gate circuit rises when the switch is turned from ON to OFF, and the monostable is activated. A plunger control circuit for a tape recorder, characterized in that a flip-flop circuit operates.