JPS606023B2 - Tape recorder with fast forward and rewind mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder having a desk feed and rewind mechanism controlled by a plunger.

First, before explaining the present invention, the previously developed tape recorder will be explained, and later the present invention will be explained using this tape recorder.

Next, one embodiment of the structure will be described with reference to the drawings.

1 is a chassis, 2 is a motor attached to the chassis 1, 3 and 4 are first and second flywheels, and the lower ends of rotating shafts 3a and 4a are bearings on a back plate 5 attached to the back of the chassis 1. Further, the upper parts of the rotating shafts 3a and 4a are supported by resin bearing plates 6 and 7 attached to the chassis 1.

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.
Reference numeral 8 denotes a pulley supported on a base plate for installing a tape stop detection unit, which will be described later.
A belt 9 is placed between the pulley 2b iron-bonded to the rotation shaft 2a of the
is wound (see Figure 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 engaged with the 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 rotate in the tape winding direction, respectively.The control levers 10 and 11 are approximately U-shaped, and one end 10b, 11b is a pin l provided on the chassis 1 as a shield.
The other end control section 10c, 11c, which is pivotally supported by a and lb and has a stopper 11e, is connected to a selection arm 41, which will be described later.
It corresponds to the head 41a of. And the control section 10c
, 11c, the connecting gears 10a, 11a are supported in the bag. Therefore, the control levers 10 and 11 are connected to pins la,
When rotated about lb as a fulcrum, the connecting gears 10a, 11
a is gears 12a and 13 of the first and second reel stands 12 and 13;
moving along the outer periphery of the first and second flywheels 3
, 4 mesh with and disengage from the gears 3b, 4b. Note that when release bars 18 and 19, which will be described later, are rotated about pins la and lb, they are engaged and move the control levers 10 and 11, thereby disengaging the coupling gears 10a and 11a from the gears. This is an engagement piece for releasing the engagement with 3b and 4b. Reference numerals 14 and 15 designate release plungers attached to the back surface of the chassis 1, and pins 14a and 15a embedded in the suction holes of the plungers 14 and 15 protrude from the upper surface through elongated holes of the chassis 1.

Reference numerals 16 and 17 designate operation levers with the pins 14a and 15a supported on one end, and springs 18 and 1 between them and the chassis 1.
9 is installed.

One end of the release lever 20, 21' is connected to the other end of the operating lever 16, i7, and the release lever is supported approximately at the center by the pins la, lb of the chassis 1 described above.

Reference numeral 22 designates a lock plate supported by a pin lc provided on the chassis 1, and an upright piece 22a is formed corresponding to the end abutting pieces of the bars 20 and 21, and a head to be described later. A locking piece 22b is formed to be engaged with a roller 24c attached to the stand 24.

Note that this lock plate 22 is always given a clockwise rotational force by a spring 23. 24 is chassis 1
A guide groove 24a is drilled in which the pin ld installed in the chassis 1 is guided, and a pin 24b guided in the guide groove bored in the chassis 1 is installed horizontally. 25 is installed.

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, an oar 24c is provided at the tip of the head stand 24, and is engaged with a lock piece 22b of the lock plate 22 when the head stand 24 moves forward. 26, 27
are pinch loaf knit and "support frames 26a, 27a"
is supported by pins le and lf installed on chassis 1.
Pinch rollers 26 are attached to the bracket support frames 26a and 27a, respectively.
b, 27b are rotatably attached, and rollers 26c, 27c extending downward are attached, and a coiled spring 26d is wound around the pin holes e, lf, and both ends are engaged with support frames 26a, 278. , 27d are provided.

Note that one end of these coiled springs 26d and 27d is attached to 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 1, which serves to select the forward movement of the head stand and the running direction of the tape.
Reference numeral 29 is a lever for advancing the head stand which is supported by a pin 1g hammered into the back surface of the chassis 1, and is formed approximately in the shape of a 〈〈, and one end of the fork 29b is connected to the pin 24b of the head stand 24. A pin 29a is installed at the end of the pond.

301 is a control plate having an engaging pawl 30a pivotally supported by the pin 29a, and a clockwise rotational force is always applied to the lever 29 for advancing the head base by a coiled spring 31 provided on the pin 29a. Formed upright piece 29
I am concerned about c.

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

When the head stand 24 is retracted and the forward lever 29 is rotated counterclockwise, the control plate 30 has an engaging claw 30a that engages with the pin 28a that is engaged with 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 a rotary lever supported by a pin lh shielded by the chassis 1, and one end is connected to the selection plunger 2.
It is pivotally supported by the No. 8 pin 28a.

A rotating arm 34 is supported by a pin li implanted in the chassis 1, and has a pin 34a at one end and extends to the back surface of the chassis.

Note that when the head stand 24 is retracted, the rotating arm 34 comes into contact with the upright pieces 24d and 24f provided on the head stand 24, and is in a horizontal state. 35 is a swinging lever in which the pin 34a of the swinging arm 34 is passed through a long hole 35a, and the pin 35b, which is fitted 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 supported by a pin lj installed on the chassis 11, and one end of a spring wire 37 is wound around the implanted pin 36a, and the approximately middle portion passes through a hole in an 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 claws 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 spreading 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.

A spring 39 is stretched between the swing lever 34 and the chassis 1 and pulls the lever 34 to the left.

401 A pin (not shown) provided as a shield on the back surface of the chassis 1 is inserted into the elongated hole 40a, and a sliding bar is moved in parallel.
An engagement ring 36d provided on the control arm 36 is engaged with the groove 40b at one end thereof.

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, and step portions 40e and 40f that control the rotation of the story selection arm 41 are formed. Reference numeral 41 is a substantially cross-shaped selection arm whose substantially center is pivotally supported by the pin 24b of the head stand 24 described above, and the head 41a is a control unit ioc, 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.

Reference numeral 42 designates a tape stop detection unit mounting plate, and on its lower surface are the above-mentioned pulley 8, a large gear 43 that meshes with the gear 8a formed on the pulley 8, and a small gear formed integrally with the large gear 43. A cam plate 44 having a gear 44a provided on its outer periphery that meshes with the 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 pivotally supported. One end of the lever 46 faces the switch 45, and the other end is supported by one end of a pin support lever 47. An engaging pin 47a is formed at the other end of the pin support lever 47 and faces the cam groove 44M of the cam plate 44, and its upper end passes through the guide groove 42a of the mounting plate 42. A detection arm 48 has a guide rod 48a slidably inserted into the guide groove 42a, and a guide pin 48b is pivotally supported in the small hole 42b of the mounting plate 42.

Furthermore, 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. The detection lever is pivotally 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 the ball parts 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 pushed toward the slope 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 rotation stops. Note that the protrusions on the slip plates 12b and 13b are attached to the mounting plate 4.
It faces into the holes 42c and 42d of No.2. Note that the contact point 50 is switched as the control arm 36 rotates, and the head 25
51 is a lever 29 for moving the head stand forward when the head stand 24 moves forward.
The contacts are switched and the motor 2 is rotated at a constant speed.
It is also a switch that causes high speed rotation when reversed.

The above is an explanation of the structure, but next we will explain the operation.

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 lever 10day 1 are moved back to the head 41.
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 gear 13a of the second 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 at the contact point of the switch 5. Therefore, the first and second reel stands 12; the turtle 3 are both rotated in the tape winding direction, and if there is slack in the tape, this slack is removed.
When the slip plate turtle 2b and 13b are rotated 13 times, the slip plate turtle 2b and 13b are also rotated in the same direction, so that the detection lever turtle 9 moves upward as shown in FIG. When the guide rod &8a of the detection arm 49 moves within the guide groove 2a with the movement of the detection lever 49, the detection arm 4 is rotated about the guide pin 48b as a fulcrum, so that the engagement piece 4 Displace the fin c to the right. Since the engaging pin 47a of the support lever 47 is engaged with the displaced engaging piece 48c, the lower end of the engaging pin turtle 7a facing the cam groove 44b of the cam plate 44 is Therefore, even if the cam plate turtle 4 is rotated by the pulley 8, the engaging pin 47a does not come into contact with the connecting portion 44d of the cam base 44c, but the engaging pin a is pressed against the inner peripheral wall. The reel shaft portion 1 of the reel stand turtles 2 and 3 is held in line.The tape slack is removed.
Since the rotation of the turtles 2c and 3c is stopped by the friction between them and the reel platform turtles 2 and 13, the slip plate 12 also
The rotational force of is lost.

Since the reel base 12 and the turtle 3 are in a slip state with the reel shaft portions 2c and 13c, they continue to rotate.On the other hand, the cam plate 44 is constantly rotated by the pulley, so the engagement pin 47a It is moved toward the center by the inner peripheral wall of the cam groove turtle 4b and maintained in that state.Then, the engagement portion 448 of the cam base 44c is located on the trajectory of the moved engagement pin 7a, so that the engagement pin 47a is pushed by the engaging portion 44d.Therefore, the switch control lever mother 6 is rotated to close the switch 45.Since this switch umbrella 8G is connected to the selection plunger 281, "energizes the plunger 28. This plunger 281 When the energized suction village is pulled, the pin 28a and the engaging claw 3 of the control plate 38
0a is engaged, the control plate 30 is pulled and the head stand advancement lever 29 is rotated clockwise.

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 selection plunger 28 is de-energized and the suction punch is restored,
The head stand 24 is fixed in the forward position. Note that when the head platform advancement lever 29 is rotated, it is rotated toward the upright piece 29c by the control plate 3 sardine coil spring 311, so that the engaging claw 30a moves from the trajectory of the pin 28a of the plunger 2. Therefore, when the head stand 2 trout is moving forward, even if the plunger 28 neck is energized again, the pin 28a and the engaging claw 38a will not be engaged.On the other hand, the head stand 2
When the umbrella moves forward, there are 2 pinch loafs, 2? The rollers 26c, 27c and the notch 24fv 2 of the head stand 2 mother
4g is disengaged, and one end of the coiled springs 26d and 27d is released from the upright piece 2d during its forward movement. Each pinch loaf unit 2 by being pressed by 24e
6927 is rotated by the spring force toward the cap stan 3 to turtle a side.

Here, if the slide lever turtle is moving to the right as shown in the 5th turtle bait diagram, the ``pinch loaf unit 6''
's roller Tsuyu Akebono c gives slide lever 4 phantom Takebe 4 mouse c "
Since the rollers 4 and b of the selection arm 4 contact each of the stepped part turtles e, the rotation of the pinch low unit dew 6 is blocked midway, and the back of the pinch roller 2 b supports the cap stand 3a. Never.

In addition, the selection arm 5 is rotated counterclockwise in all directions, and the head 4
Since the force a touches the control part oc of the control lever turtle Q and moves it, the coupling gear ◎a and the gear 3b of the first flywheel 3 are disengaged. On the other hand, since the roller 27C on the side of the pinch low unit 27 is located away from the stepped portion 4Qd of the slide lever turtle case, the rotation of the pinch low unit 23 is not prevented. Pressed.

In addition, the head 4 of the selection arm 41 a does not come into contact with the control part 1 c of the control lever keg, so the connection gear a allows the gear b of the second flywheel register and the second reel stand tortoise 3.
continues to be connected to the gear neck 3a. 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 touches the tape, the second reel stand 13 starts rotating in the direction of winding the tape, and the tape is pinched between the carburetor 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 13M 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 2 also applies a clockwise rotational force.

Therefore, the detection arm 48 is rotated clockwise and the pin support lever is rotated clockwise. The engaging pin 47a is inserted into 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, when the tape has stopped running and the reel shafts 2c and tortoise 3c of the first and 21st reel stands 12 and 13 have stopped, the reel shafts of the reel stands i2 and tortoise 3 are removed after the above-mentioned tape slack is removed. Part 12c,
] In the same manner as when the switch 3c is stopped, the switch 45 is closed and the selection plunger 28' is energized.

When the plunger 28 is energized and the suction pad is pulled, the rotating bar 33 is rotated clockwise. In addition, control plate 3
Since the skin head stand 24 is moving forward, the engaging claw 30a is retracted from the trajectory of the pin 28a, so the head stand advancement lever 29 is not rotated. Here, the slide lever 40 is moving to the right, and the control arm 36, which is engaged with the groove 40M and the engagement punch 36d, is rotated counterclockwise. The movable arm 34 is rotated clockwise. The swing lever 35 with the pin 34a of the swing arm 34 inserted into the long hole 35a is rotated clockwise, and the engagement claw 35d is engaged with the engagement #36d of the control arm 36. Therefore, when the rotation 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.
rides on the stepped portion 40d, and the roller 41c of the selection arm 41 rides on the stepped portion tortoise of. Therefore, the pinch roller 27b is separated from the capstan turtle a, and the control section 11c of the control lever lever 1 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, the roller 26d of the pinch row unit 26 comes off the step 40c, so the pinch roller 26b is pressed against the capstan 3a, and The head 41a of the selection arm 41 is the control lever IQ.
Since the connecting gear 10a is located away from the control unit IQc of the first
The gear 3b of the flywheel 3 and the gear amount 2a of the first reel stand 12 are connected. As a result, the tape starts running in the opposite direction, and the rotation of the control arm 36 causes the switch 5 to
Since the contact point 0 is switched and the channel of the head 25 is switched, the track in the opposite direction is played back.In the above state, however, the control arm 36 is rotated clockwise and the channel of the head 25 is switched.
Since the rotating arm 34 is rotated counterclockwise by the spring wire 37, the swinging lever 35 is rotated counterclockwise so that the engaging pawl 35c can engage with the engaging pawl 36c of the control arm 36. maintained in the state.

Therefore, when the playback is finished again and the stop of tape running is detected by the same operation as the one entrusted, the selection plunger 28 is energized, the swing lever 35 rotates the control arm 36 counterclockwise, and the slide lever 40 to the right, it will return to the above-mentioned initial state and start playing in the original direction.Also, if you want to change the playback channel during playback, close the switch and select it by replay fishing, etc. (not shown). By energizing the plunger 28, it becomes possible to perform reproduction in the reverse direction by the same operation as the operation after detecting the end of the tape described above.

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

Press the rewind button (not shown) and close the switch~
The release plunger turtle 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 3. Therefore, the lock piece 22b and the roller 24c of the head stand 24 are unlocked, and the spring 3 is released via the head stand advancement lever 29.
Move back with spring force of 2. 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 moved to the second position.
Move away from the gear 4b of the flywheel 4 and move the second reel stand 1
3 is in a free state. On the other hand, the control section 10c of the control lever 10 is no longer restricted by the head 41a of the selection arm 41, which moves backward as the head stand 24 moves backward, so it returns to its original position due to the spring force of the spring 11e, and the connecting gear 10a moves back to its original position. The gear 3b of the first flywheel 3 and the gear 12a of the first reel stand turtle 2 are connected. Also, the head stand 24 moves back and the head stand advance lever 29 switches the switch 1, causing the motor 2 to rotate at high speed. Therefore, the first reel 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 46 is closed by the same operation as that after detecting the end of the tape described above. While the plunger 28' is energized, the energization to the release plunger 5 is cut off and the head stand 28' is turned off again.
advances 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.
8 is in a horizontal state so that the engaging claws 36c, 36d do not engage with any of the engaging punches 36c, 88d of the control arm 36. In addition, when returning to playback during rewinding, the power supply to the release plunger 5 is cut off by operating a play money 0 (not shown) or the like.

As a result, the operating lever 17 is returned by the spring shaft 9 and the release lever 21 is returned, so that the control lever shaft returns to its original position. Reel stand turtle 3's gear turtle 3a
Since the second reel stand 13 rotates in the opposite direction to the first reel stand 12, if there is slack in the tape, the slack is removed. When the slack is removed, the head stand 2 moves forward by the same operation as when loading the tape described above, 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 you press the fast forward anchor (not shown) and close the switch,
After the release plunger 4 is energized and the entire tape is wound in the same way as when rewinding is performed during playback, the first and second reel stands 12 and 13 start winding the tape, respectively. , and playback starts in the fast forward direction.
However, since the tape is all wound in the fast forward direction, actual playback is not performed and the tape is stopped. Then, the tape end detection operation is performed, the switch 45 is closed, and the selection plunger 28 is energized, so that the same operation as described above is performed when the playback progresses and reaches the end of the tape and playback is performed in the opposite direction. Reproduction is started in the reverse direction. The tape recorder described above is configured to perform fast forwarding or rewinding by energizing either the release plunger 14 or 15. Also, in the case of a portable device, it is difficult to provide sufficient driving force to the plunger, considering the need to downsize the plunger or save power consumption, and depending on the load condition of the plunger, fast forward or rewind operations may not be possible. The present invention provides the following advantages: ``When the tape recorder is used for forwarding and rewinding, the common lock plate 22 is rotated by the operation of the release plungers 149 and 15, and the head stand 2 is rotated.
The purpose of this mechanism is to excite both the descaling plunger 14 and the tortoise 5 at the beginning of fast forwarding and rewinding to obtain sufficient force to rotate the lock plate 22. It is an object of the present invention to provide a tape recorder in which only one release plunger is held in an energized state for fast forwarding or rewinding after that.

The present invention will be explained below with reference to Examples.

In Fig. 13, 1, 12 are input terminals, and this input terminal 1 is normally at ground potential, and the starting voltage V is changed for a certain period of time by operating a table advance or rewind button (not shown). After the voltage is applied, it becomes a released state and is controlled to return to the ground potential by releasing the button. R
, ~R7 are bias resistors, and input terminals 1, . The values are determined so that the transistor Q5 is turned on when the voltage 12 is at the starting voltage Vcc, and turned off when the transistor Q5 is in the released state. D, , D2 are diodes that cut off the influence on non-controlled input terminals during plunger operation, and D3 to D6 are diodes inserted to selectively operate two plungers, which will be described later. Q,,Q2 and Q3,Q4
are release plungers 14 and 15 (hereinafter referred to as fast forward plunger 14 and rewind plunger 15), respectively.
This is a transistor that drives the . Now, a case will be described in which fast forwarding is performed during playback when the tape is being wound in the right direction.

When you press the fast forward plow (not shown) and close the switch,
Starting power Vcc is first applied to input terminal 1.
Then, the transistors Q, , Q2 via the diodes D,
is turned on and the fast forward plunger 14 is energized, while the transistor Q is biased to the on state via the diode D3 and its collector voltage is applied to the base of the transistor Q via the diode D6, turning it on. .
Therefore, transistor Q4 is also turned on and rewinding plunger 15 is energized. Fast forward and rewind plunger 14
. rotates the upright piece 22a of the lock plate 22 against the spring force of the spring 23. Therefore, lock piece 2
2b and the roller 24c of the head stand 24 are released, and the head stand 24 is moved backward by the spring force of the spring 32 via the head stand advance lever 29. After time passes, input terminal 1
, is in a free state. Therefore, since transistor Q5 is turned off, diode DB and transistors Q3 and Q
The rewinding plunger 5, which had been turned on via the rewinding plunger 4, completes its role and is released. However, transistors Q,,Q2
continues to be on due to the voltage applied by the bias resistors R, , R2, and the fast forward plunger 14
continues to be excited while the fast forward button is pressed. Therefore, after that, the second reel stand 13 rotates at high speed at the same time as the above-described fast forwarding operation, and fast forwarding of the tape is started. 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 the rewind button (not shown) is pressed and the switch is closed, the starting voltage VM is applied to the input terminal 12 in the same manner as in the above case. Then, transistors Q3 and Q4 are turned on via diode D2, and the rewinding plunger 15 is excited, while transistor Q5 is biased to the on state via diode D4, and its collector voltage is applied to transistors Q and Q through diode D5. Apply to the base and turn it on. Therefore, the transistor Q2 is also turned on, and the fast-forward plunger 14 is excited. When both the fast forward and rewind plungers 14, 15 are excited simultaneously, the release lever 20,
21 are rotated together, and the upright piece 22 of the lock plate 22
a is rotated against the spring force of the spring 23. When a certain period of time necessary for completing these series of switching operations has elapsed, the input terminal 12 is released. Therefore, since the transistor Q5 is turned off, the fast-forward plunger 14, which had been turned on via the diode D5, is turned off. However, the transistors Q and Q4 continue to be on due to the voltage applied by the bias resistors 3 and R4, and the rewinding plunger 15 continues to be excited in the dark state in which the rewinding nail is pushed, causing the rewinding operation described above. Similarly, the first reel stand 12 rotates at high speed to wind up the tape. Therefore, the lock plate 22 can be reliably unlocked in both fast forwarding and rewinding. FIG. 14 is a circuit diagram showing another embodiment, in which the same parts as in FIG. 13 are designated by the same symbols.

D7 and D8 are diodes, input terminals 1, 1
2, the starting voltage V is determined so that it is turned on while V is applied. R? , RB are bias resistors whose outputs control transistors Q7 and Q8. Diode D9,○. o is for blocking reverse voltage, and is not necessarily necessary depending on how the power supply voltage is determined. Now, if the fast-forward button (not shown) is pressed, the fast-forward plunger 14 is turned on and the rewind plunger 15 is turned on as described above. , transistors Q7 and Q are turned on, and when the lock plate 22 is rotated to enter the fast-forward operation state, the rewind plunger 15 is released and fast-forward continues.

In the case of rewinding, both plungers 14 and 15 are similarly excited to enter the rewinding operation state, and then the fast-forwarding plunger 14 is released to continue rewinding. Therefore, similarly to the above, the lock plate 22 can be reliably unlocked in both fast forwarding and rewinding. The tape recorder of the present invention described above includes a fast-forwarding plunger for holding the tape in a table-feeding state, a rewinding plunger for holding the tape in a rewinding state, a lock plate controlled by both of the plungers, and a lock plate controlled by the lock plate. The tape recorder has a head stand that is locked in the forward position, and the two plungers operate simultaneously during fast forward or rewind operations, and after controlling the lock plate and releasing the lock with the head stand, one of the plungers operates simultaneously. Since the configuration has a control circuit that maintains fast forward or rewind operation so that only the plunger continues to operate, even if the small plunger is driven by a low voltage power supply, it will reliably perform forward or rewind operations. Moreover, the power consumption in the holding state can be extremely reduced.

In addition, in the embodiment shown in FIG. 14, since the starting state is controlled by the higher power supply voltage V2, and the holding state is controlled by the lower stabilized power supply voltage Vcc, sufficient starting force can be obtained. Even more effective effects can be expected, such as suppressing wasteful power consumption in the holding state.

[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 oblique view, Fig. 4 is a plan view of the head stand drive part showing the playing state, and Fig. 5 is a plan view of the entire tape recorder. ,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,
, 9 is a perspective plan view of the tape end detection part, FIG. 10 is a plan view of the leftward playback state, FIG. 11 is a true plan view of the rightward playback state, and FIG. 12 is a plan view of the leftward fast forwarding state. A plan view, FIG. 13 is a plunger control circuit diagram of the present invention, FIG.
The figure shows a plunger control circuit of another embodiment. 1... Chassis "2... Motor, 3, 4... 1st, 2nd
Flywheel, 10, 11...control lever "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... 1. pinch low unit, 28...Plunger for selection, 29.
..."Head base advancement lever, 30... Control plate, 33... Rotating lever, 34... Rotating arm, 35... Rocking lever, 36... ...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. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure g Figure 10 Figure 11 Figure 12 Figure 13 Figure 14

Claims (1)

[Claims] 1. A fast forward plunger that holds the tape in a fast forward state, a rewind plunger that holds the tape in a rewind state,
a lock plate controlled by both plungers;
A tape recorder having a head stand locked in a forward position by the lock plate, wherein both plungers operate simultaneously during fast forwarding or rewinding operations to control the lock plate and release the lock with the head stand. A tape recorder having a control circuit that allows only one plunger to continue operating to maintain fast forward or rewind operation.