JPS6134587Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder, and particularly to a tape recorder that uses the power of a motor to bring a tape drive system into a playback state.

In conventional tape recorders, the playback button is manually pressed to start playback, and the time required for playback is momentary. It was almost at the same time. However, when using motor power for a certain period of time, say 0.8 seconds, to the point where the regenerated state is locked, the pressure roller comes into pressure contact with the capstan, and the idler is attached to the take-up turntable. The important point is which one comes first, the timing of pressure contact. This is not much of a problem if the pressure roller and capstan come into pressure contact first, but if it is the other way around, the tape will be played back due to the rapid rotation of the take-up turntable until it reaches the playback state. If this is a recording operation, there will be a part at the beginning of the recording where the sound that entered the sound source is not recorded at the rated speed, so when this is played back, it will be played back as a different sound from the sound source. This has a fatal drawback for tape recorders, which is that they can be stored away. Also, when the pressure roller and capstan are brought into pressure contact first, if the tape is pressed too quickly, the tape may come out from the half of the cassette.
Sometimes it gets wrapped around the pressure roller. Even if it doesn't go that far, if it's a little too early, the tape may crease.

The purpose of this invention is to use a tape recorder that uses motor power to bring the tape drive system into playback mode.The purpose of this invention is to instantly move the pressure roller, capstan, and take-up turntable in a tape recorder that uses motor power to bring the tape drive system into playback mode. An object of the present invention is to provide a tape recorder which brings the tape into a playback state almost simultaneously by crimping the tape and the idler.

For this reason, the present invention performs a regeneration operation, and the pressure roller and capstan are
By stopping the pressure contact between the take-up side turntable and the idler, and releasing the stopped state at the same time or with a slight delay when the regeneration mechanism is locked, and by almost instantaneously bringing the drive system into pressure contact. The problem lies in solving the problem caused by timing.

Embodiments of the present invention will be described below with reference to the drawings. 1st
2 is a plan view of the reel base board 78 in FIG. 1, and FIG. 2 A is a plan view of the reel base board 78 in the stopped state.
-A sectional view, Figure 2B is a BB sectional view in Figure 2,
Figure 2C is a sectional view taken along line CC in Figure 2, Figure 2D is a sectional view taken along line DD in Figure 2, and Figure 2E is a sectional view taken along line E-E in Figure 2.
The cross-sectional view, FIG. 3, is the reel base board 78 of FIG. 1.
FIG.

In FIG. 1, reference numeral 3 denotes a head board, and a head board stand 22 on which a recording/reproducing head 23 and an erasing head 24 are mounted at predetermined positions is attached to the head board 3. Reference numeral 5 denotes a pressure roller arm, which is biased clockwise by a spring 4 about a fulcrum 5a. 19 is a capstan, and 20 is a pressure roller, which are pivotally supported by the pressure roller arm 5. 7 is a fast forward/rewind motor, 9 is a drive motor, 26 is a conversion plate, and the spring 25 is centered around the fulcrum 26a.
is biased clockwise by When stopped, the portion 26b of the conversion plate 26 is in contact with the portion 1a of the substrate 1 and is positioned. During playback (recording) and song selection, the section 26c of the conversion board 26 contacts and interlocks with the section 3d of the head board 3, so the conversion board 26 is positioned according to the position of the head board 3.

78 is a reel base board, and many parts are mounted on this board 78. FIG. 2 shows this situation in detail. 81 is a take-up side turntable, and 84 is a turntable pulley, which are coaxially arranged. 82 is a feed-out side turntable, 77 is an idler, and the support shaft 76a of the idler slider 76
The idler slider 76 is biased in two directions by a spring 75. 79
is a take-up roller, which has a take-up pulley 80 on the same axis, and rotates the take-up pulley 80 and take-up roller 79 through the rotational force of the drive motor 9 shown in FIG. 1 via the motor pulley 91 and the take-up belt 67. . 85 in the center of Figure 2 is the FR gear, 68 is its support shaft, 99
(Figure 2A) is the FR arm, with the support shaft 68 as the axis.
It has an FR gear 85 and an FR pulley 86, and is centered around a pin member 93 planted on an FR arm 99.
FR gear 83 is installed, and the fast forward mode shown in Figure 1
The forward/reverse rotational force of the rewind motor 7 is transferred to the FR pulley 86 via the motor pulley 92 and the fast forward belt 66.
When rotated, the FR gear 85 and the FR gear 83 rotate, and at the same time, the FR arm 99 rotates the fast forward/rewind motor 7 around the spindle 68. In the return state), the FR gear 83 rotates the winding side turntable 81 and the feeding side turntable 82, and fast forwarding/rewinding operations are performed.

Figure 3 shows the reel base board 78 in Figure 1.
FIG. 3 is a plan view showing components arranged below with the head board 3 removed. In FIG. 3, a flywheel belt 65 is stretched between the motor pulley 91 of the drive motor 9 and the flywheel 39. As shown in FIG.
70 is a solenoid, 72 is a solenoid lever,
The solenoid 70 rotates about a fulcrum 72a. Although not shown, the solenoid lever 72 is biased clockwise by a weak spring.

The solenoid 70 is momentarily energized in order to time the drive mechanism only during song selection and during playback. When the solenoid pin 71 pulls the solenoid lever 72 at one end 72c in the A direction, the other end 72b comes into contact with the 3a section on the head board 3 that positions the recording/playback head 23 (FIG. 1) when selecting a song. Can be pressed.

The head board 3 has a spring 87 that provides forward force.
(Fig. 1), and when stopped, the through hole 2 of the power shift lever 28 shown in Fig. 3
The lower bent portion 3b of the head substrate 3 is in contact with and positioned at the portion 28c of the head substrate 8b. The power shift lever 28 moves to the fulcrum 2 in conjunction with the rotation of the flywheel.
It rotates around 8a and is biased in two directions by a spring 47. The position of the power shift lever 28 when stopped and after rotation is regulated by a lock lever (not shown).

Here, the spring 47 for the power shift lever 28 (Fig. 3) is the spring 8 for the head board 3.
7 (Fig. 1), the head board 3 moves back to the position 1 of the board 1 in conjunction with the counterclockwise rotation of the power shift lever 28 (Fig. 3).
The head board 3 is slid and positioned until the part 3c of the head board 3 comes into contact with the part b.

88 is a shaft mounted on the power shift lever 28, and when stopped, one end 74d of the drive lever 74
The part 74b moves the drive lever 74 to the fulcrum 7.
4a as an axis, and rotate counterclockwise around 74 at the other end.
The b part is the first part 76b of the idler slider 76.
By pressing in the direction A in the figure, the idler 77 is separated from the turntable pulley 84 and the take-up roller 79. In FIG. 3, 73 is a relay lever, and when selecting a song, the 73c section is pressed by 72b by the clockwise rotation of the solenoid lever 72, and is rotated counterclockwise about the fulcrum 73a, at which time the 73b section The upper bent portion 74b of the drive lever 74 is pressed to push the idler slider 76 in FIG. 1 in the A direction.

The protrusion 5b is in contact with the upper bent portion 74c of the drive lever 74 in FIG. This protrusion 5b is a downward protrusion connected to the other end of the pressure roller arm 5 in FIG. The return force is much smaller. A pressure roller 20 is attached to the pressure roller arm 5, and when the drive lever 74 rotates clockwise, the pressure roller arm 5 also rotates clockwise, and the pressure roller 20 is attached to the capstan 19 connected to the flywheel 39. is pressed against. Furthermore, spring 7
The spring 5 has a much smaller return force than the spring 4.

When a playback operation is performed, the solenoid 70 is momentarily energized for, for example, 1.5 seconds, and the pinch roller 20 is in the same state as the song selection state described later, that is, the pinch roller 20 is in the capstan 19 state.
The idler 77 moves slightly away from the winding roller 79.
and takes a position away from the turntable 84, and after the solenoid 70 is energized, it enters the playback state.

In the playback state, the power shift lever 28 is rotated counterclockwise about the fulcrum 28a to a home position by the rotation of the flywheel 39. By rotating the power shift lever 28, the head board 3
(FIG. 1), the head board 3 is slid in the A direction by a spring 87 until the part 3c of the head board 3 comes into contact with the part 1b of the board 1. When the shaft 88 also moves in the direction A due to the rotation of the power shift lever 28 in the direction A, the pressure on the portion 74d of the drive lever 74 is released, and the spring 4 causes the pressure roller arm 5 to move in the direction A.
When portion b is rotated clockwise about the fulcrum 5a, the pressure roller 20 comes into pressure contact with the capstan 19 and winds up the tape.

5b portion of the pressure roller arm 5 and the drive lever 74
74c is in contact with the drive lever 7.
4 is rotated clockwise and the idler slider 76
is biased in two directions by the spring 75, and the idler 77 is pressed against the take-up roller 79 and the turntable pulley 84, and transmits the rotation of the take-up pulley 80 to the take-up turntable 81.

In conjunction with the sliding movement of the head board 3 in the A direction, the conversion plate 26 is positioned by being pressed by the 3d part of the head board 3 at a portion 26c about the fulcrum 26a. Attach the FR arm 9 to the U groove 26d of the conversion plate 26.
9 pin member 93 is inserted to place the FR gear 83 at an intermediate position between the winding side turntable 81 and the feeding side turntable 82.

For fast forward/rewind status, use the fast forward/rewind motor 7.
This is done by forward and reverse rotation. The fast forward operation is performed by forward rotation of the fast forward/rewind motor 7, which activates the FR pulley 86.
rotates and the FR arm 99 is rotated in the direction B about the support shaft 68. At the same time, the FR gear 85 is rotated counterclockwise and the FR gear 83 is rotated clockwise.
Move to position a and turn the winding side turntable 8.
It meshes with the gear section No. 1 and fast forwarding operation is performed.

In the rewinding operation, the fast forward/rewind motor 7 is reversely rotated, the FR pulley 86 (A in FIG. 2) rotates, and the FR arm 99 is rotated in the direction C about the support shaft 68 in FIG. The FR gear 85 rotates clockwise and the FR gear 83 rotates counterclockwise.
It moves to position b, engages with the gear portion of the feed-out turntable 82, and performs a rewinding operation.

In the song selection state, the solenoid 70 is energized, the drive motor 9 rotates, the flywheel 39 rotates, the power shift lever 28 is rotated to the home position, and then the fast forward/rewind motor 7 is rotated.
The relationship is controlled such that it rotates.

Since the solenoid 70 is energized during the song selection operation, the solenoid pin 71 is connected to the solenoid lever 72.
Since the portion 72c is biased in the A direction, the portion 72b is rotated clockwise about the fulcrum 72a.

Next, the rotation of the drive motor 9 rotates the flywheel 39, and the rotation of the flywheel 39 causes the power shift lever 28 to rotate in the A direction about the fulcrum 28a to a fixed position. As the power shift lever 28 rotates, the head board 3 slides in the A direction by the spring 87 until the part 3c of the head board 3 comes into contact with the part 1b of the board 1. However, before this comes into contact, the part 3a of the head board 3 Since the solenoid lever 72 comes into contact with the 72b portion and is prevented from moving forward in the A direction, a gap of m is created between the 1b portion and the 3c portion. Shaft 88 is also power shift lever 2
When moving in direction A by rotating 8 in direction A,
When the pressure on the portion 74d of the drive lever 74 is released and the spring 4 rotates the portion 5b of the pressure roller arm 5 clockwise about the fulcrum 5a, the pressure roller 20 comes into pressure contact with the capstan 19 at the relay lever. 73c part of 73 is solenoid lever 7
2 and is rotated counterclockwise about the fulcrum 73a, the relay lever 73
Since the section 73b presses the section 74b of the drive lever 74 counterclockwise, the section 74c rotates the section 5b of the pressure roller arm counterclockwise, preventing the pressure roller 20 and the capstan 19 from coming into contact with each other. .

In addition, the idler slider 76 is also connected to the drive lever 74.
Since the portion 74b of the relay lever 73 is pressed counterclockwise by the portion 73b of the relay lever 73, it is pressed in the A direction, and the idler 77 is not pressed against the take-up roller 79 and the turntable pulley 84, so the tape drive is stopped. Since the head board 3 is forcibly held in a position one step lower than during playback, the conversion board 26
Similarly, when the pin member 93 is at the respective positions 93a and 93b during fast forwarding and rewinding, the converting plate 26 is moved to the oblique side portions 26f and 26e of the converting plate 26. It's in a position where they don't touch each other. Next, fast forwarding/rewinding is performed by rotating the fast forwarding/rewinding motor 7 in forward and reverse directions.

For fast forward/rewind status, use the fast forward/rewind motor 7.
This is done by forward and reverse rotation. The fast forward operation is performed by forward rotation of the fast forward/rewind motor 7, which activates the FR pulley 86.
rotates and the FR arm 99 is rotated in the direction B about the support shaft 68. At the same time, the FR gear 85 is rotated counterclockwise and the FR gear 83 is rotated clockwise.
Move to position a and turn the take-up side turntable 81.
The gear meshes with the gear part of the holder to perform a rapid forwarding operation. Rewinding operation is performed by reversing the fast forward/rewinding motor 7.
The FR pulley 86 rotates, and the FR arm 99 rotates around the support shaft 6.
At the same time as it is rotated in the C direction about 8, the FR
The gear 85 rotates clockwise and the FR gear 83 rotates counterclockwise, and moves to position 83b, where it engages with the gear portion of the feed-out turntable 82 and a rewinding operation is performed.

The recording/playback head 23 is positioned one step lower than when playing.
Since the magnetic tape runs while contacting the recording/reproducing head 23 during fast forwarding and rewinding operations, the unrecorded portion of the magnetic tape is detected, and when the detection is completed, the solenoid 70 is activated. Since the energization is canceled, the positional restriction of the head board 3 and drive lever 74 by the solenoid lever 72 is released, the head board 3 is moved to the playback position, the pressure roller 20 is moved to the capstan 19, the idler 77 is moved to the take-up roller 79, The turntable pulleys 84 are momentarily pressed into playback positions to perform playback and recording.

FIG. 8 is a plan view showing the relationship between the head board 3 and the power shift lever 28 of FIG. 3 in a stopped state, and FIG. 9 is a plan view of parts arranged further below in FIG.

In FIGS. 8 and 9, 38 is a power assist gear, 30 is a timing arm that rotates around 30a around the power assist gear, and 90 is a spring that biases the timing arm in one direction. It serves as a fulcrum and applies biasing force in a counterclockwise direction. Next, 40 is a lock lever which can be rotated about 40a as a fulcrum and is biased clockwise by a spring 41. When the power assist gear 38 is stopped, it enters the cam 38b of the power shift gear 38 to stop the gear 38 at a certain position, so that the toothless part 38e of the power assist gear 38 comes to the gear part 89a integrated with the flywheel 39. in position. Next, 39 is a flywheel, and a gear part 89a
The cam part 89b rotates integrally with the cam part 89b.

28 is a power shift lever that rotates around 28a as a fulcrum. A clockwise rotational force is applied by the force of the spring 47. 29 is a roller fitted to the power shift lever 28. The lock lever 34 is urged by a spring 36 to rotate counterclockwise around the 34a as a fulcrum, and the lock lever 34 is urged by a spring 36 to rotate counterclockwise around the cam portion 34b.
locks and keeps it in playback state. The bent portion 3b of the headband 3 is fitted into the through hole 28b,
The spring 47 acts against the force of the spring 87 which is biased in the direction A in which the head van 3 moves forward.
The headband 3 is held in the stopped position. 88 is a shaft attached to the power shift lever 28, and when the drive lever 74 is in a stopped state, the force of the spring 47 is applied to the drive lever 74, and the force of the idler compression spring 75 and the force of the spring 4 biased against the compression roller arm 5 are applied. The idler 77 is moved away from the turntable pulley 84 and the pressure roller 20 is moved away from the capstan 19 to maintain a stopped state.

Next, when a regeneration signal switch (not shown) is pressed to enter the regeneration state, the solenoid 42 is activated and pulls the plunger pin 43, rotating the lock lever 40 counterclockwise around 40a. The cam part 38b is separated from the place where it was being held, and the arm part 40c having a spring force is used to operate the timing arm 30 clockwise with the 30a as a fulcrum against the force of the spring 90, and rotate it counterclockwise. The power shift gear 38 is rotated clockwise by the rotational force of the cam part 89b, and the gear part 38a of the gear 38 and the gear part 89a integrated with the flywheel are brought into contact with the cam part 89b.
The rotating torque of the gear 89a is transmitted to the power shift gear 38 to rotate the gear 38 clockwise, and the cam 38 is used to move the roller 29 in the A direction along the shape of the cam 38. Therefore, move the power shift lever 28 (Fig. 8) to 28a.
is used as a fulcrum and moved counterclockwise to lock the female pin 28e to the cam portion 34b (the 10th
figure). At this time, the head board 3 is attached to the spring 8.
Move to the playback position by the spring force of 7,
It stops at a stopper (not shown) on the chassis, and the erasing head 24 and the recording/playing head 23 move the tape 9.
1. Also, at this time, the shaft 88, which is attached to the lever 28, moves away from the drive lever 74 to release the stopped state, as shown in FIG.
As shown in FIG. 4, the pressure roller arm 5 rotates clockwise about the fulcrum 5a and presses against the capstan 19. At this time, as shown in FIG. 5, the idler 77 comes into pressure contact with the winding roller 79 and the turntable pulley 84 by the force of the spring 75 to start the winding operation and enter the reproducing state.

Switch 2 completely shifts power shift gear 38 to 1.
Operation is stopped by grounding other mode conversion switches until rotation is complete. For example, if you press another mode conversion switch, such as a fast forward switch, while the power shift gear 38 is rotating,
It is designed not to switch to fast forward mode during rotation. The reason for doing this is that if the mode is changed while the power shift gear 38 is rotating, the magnetic head, pressure roller, idler, etc. will get stuck in the fast forward or rewind state and damage the magnetic tape. There is a risk that such accidents may occur, so measures are taken to prevent them.

Next, in the regeneration state, the timing at which the pressure roller 20 presses against the capstan 19 and the idler 77
It would be good if the timing of contacting the turntable pulley 84 and transmitting the rotation of the take-up roller 79 is perfectly aligned or instantaneously starts rotating almost simultaneously, but as in the mechanism of the present invention, the power of the motor is used. If the amplifier switch is turned on early and the take-up turntable 81 rotates after the pressure roller 20 is attached to the capstan 19, there is no problem. If the order is such that the winding side turntable 81 is rotated, and the pressure roller 20 is attached to the capstan 19 later, the sound recorded on the tape will be played back at a faster rotation speed, resulting in abnormal noise. It will be played.

Also, if this is a recording operation, the tape rotates rapidly at the rotational speed of the take-up turntable 81 until the pressure roller 20 hits the capstan 19, so a sound different from the source may be recorded on the tape. Put it away. In order to eliminate these fatal flaws, the timing of the pressure contact between the driving pressure roller 20 and the capstan 19 and the pressure contact of the idler 77 with the turntable pulley 84 to transmit the rotation of the take-up roller 79 when entering the playback state is determined. Instead of operating the timing at which the magnetic head presses the tape so that it is unknown which one will press first depending on the precision of the parts, the pressure roller 20 is operated when the magnetic head is at a position slightly lower than the playing state.
The capstan 19 is in a position where it is not in pressure contact with the turntable pulley 84, and the idler 77 is in a position where it is not in pressure contact with the turntable pulley 84 and does not transmit the rotation of the take-up roller 79. After the parts are stopped and playback or recording is locked, the stopped operation is immediately released and the pressure roller 20, capstan 19,
By pressing the idler 77 against the turntable pulley 84 and the magnetic head against the tape,
This makes it possible to play back or record data, thereby eliminating fatal defects as a tape recorder due to timing errors due to variations in component precision.

Next, the embodiment will be explained with reference to FIG. 3. When the vehicle is in a stopped state, the power shift lever 28 is biased clockwise by the force of the spring 47 using the fulcrum 28a. Since the shaft 88 is fixed upwardly to the power shift lever 28, the drive lever 74 is moved upwardly by the shaft 88.
The idler slider 76 (FIG. 1) is rotated counterclockwise around a as a fulcrum, and the idler slider 76 (FIG. 1) is pushed up in the direction A at 74b, so that the idler 77 is in a position where it does not come into pressure contact with the turntable pulley 84. and 74 in Figure 3
Press the leg 5b of the pressure roller arm 5 in the direction A at the part c, rotate the pressure roller arm 5 in FIG. The stopped state is maintained by blocking the

When the next regeneration operation is performed, when the shaft 88 is locked as described above by rotating the power shift lever 28 counterclockwise by the power of the motor,
To free the drive lever 74 (Fig. 5),
The pressure roller 20 is pressed against the capstan 19, the idler slider 76 is pulled by the spring 75, and the idler 77 is brought into contact with the turntable pulley 8.
4 and transmits the rotation of the take-up roller 79 to bring it into a regenerating state. When using the power of the motor to achieve this regeneration state, the solenoid 70 is regenerated so that the pressure roller 20 and take-up turntable 81 start rotating instantly. Or, immediately after the recording operation is performed, pull the plunger pin 71 in the A direction, rotate the solenoid lever 72 clockwise about the fulcrum 72a, and rotate the relay lever 73 counterclockwise. By pressing the bent portion 74b of the drive lever 74 at the end 73b, the idler slider 76 is pressed against the spring 75 so that the idler 77 moves toward the turntable pulley 84.
Also, the pressure roller 20 is prevented from coming into pressure contact with the capstan 19, and the head board 3 on which the magnetic heads 23 and 24 are mounted is stopped at a position only a meter away from the stopper position 1b in the playback state. Solenoid lever 72
The solenoid 70 presses the bent portion 3a of the head board 3 at the end 72b (FIG. 3) of the head board 3.
When the playback or recording operation is performed using the power of the motor and is locked, the solenoid 7 is activated at the same time or with a slight time lag.
0 is turned off, the pressure roller 20 is pressed against the capstan 19, the idler 77 is pressed against the turntable pulley 84, and the head board 3 is pulled by the spring 87 until it hits the stopper 1b to bring it into the playback state.

Next, in order to put the tape recorder, which is powered by power transmitted from the drive motor to the flywheel, into a recording state, the solenoid 33 used for stopping is used, and the solenoid 42 for playback is turned on. Activate slightly earlier than activating.
At this time, the recording spring lever 35 is rotated clockwise using the plunger pin 50 using the one end 35a as a fulcrum. One end of a recording spring (torsion spring) 31 wound around the shaft 34a is locked to the other end 35b of the recording spring lever 35, and the other end is locked to the recording lever 32. The clockwise rotation causes the lever 32 to rotate counterclockwise about the shaft 34a, so that the hook portion 32b of the recording lever 32 engages with the eye pin portion 28e of the power shift lever 28. At this time, the bent portion 32c of the recording lever 32 faces the end portion 46a of the recording lever 46 as shown in FIG. Here, the solenoid 42 is actuated, the power assist gear 38 is rotated clockwise as described above, and the power assist lever 28 is rotated counterclockwise about the fulcrum 28a. At this time, the locking pin portion 28e moves the recording lever 32 in the A direction.
During this movement, the bending portion 32c is
6a is pressed and the recording lever 46 is rotated counterclockwise using 28a as a fulcrum against the biasing force of the spring 48. In conjunction with this movement, the recording slider 44 is moved in the C direction via the spring 48. The recording switch 69 is pressed at the end 44a to switch to a recording state. Then, the locking pin 28e locks the lock lever 34 at the position 34b to maintain this recording state.

Then, when the solenoid 33 is pulled again in response to a signal from the stop button, the lock lever 34 rotates counterclockwise using the 34a as a fulcrum against the force of the spring 36, and the female pin portion 28e
When the lock is released, the spring 47
It returns to the stop position by the force of . Also recording lever 32
The recording lever 32 is moved to 34a by the force of the spring 37 applied to the plunger pin 50 so as to return the recording spring lever 35 that moves the recording spring 31.
Rotate clockwise around the fulcrum and return to the stopper 11a to bring it to a stopped state. When the recording lever 32 is at this stop position, pressing only the playback button will not engage the locking pin portion 28e and the hook portion 32b, so the recording state will not be entered. Only when the record button and play button are pressed at the same time does the device operate as described above and enter the recording state. Also, when you press the record button and play button at the same time,
It is also possible to perform the recording operation described above by simply pressing the recording button without operating as described above.

However, in tape recorders equipped with an inner microphone, the sound from the inner microphone is operated by the power of a motor in order to move the inner microphone slightly between the time the magnetic head contacts the tape and the time it presses into the recording position. The sound of the mechanism or the sound of locking the door may be recorded. Therefore, a cam portion 38b having a positioning portion is formed in the power shift gear 38. As mentioned above, in the recording state, in order to utilize the power shift operation, the lock lever 40 is rotated counterclockwise about the fulcrum 40a and switched by pressing the switch 92, similar to the playback operation, to change the state to the power shift operation. gear 38
Hold until it rotates 360°. The cam part 38b operates and locks the power shift gear 38 in the recording state, and although this pushes up the roller 29 and locks it, the power shift gear 38 moves less than 360 degrees, that is, the cam part Locking is completed with a movement smaller than the movement of 38b. In this way, the mechanical operation can be completed while the inner microphone's muting circuit is fully active. The circuit works as follows.

In Fig. 11, inner microphone M1,
Power for M2 is supplied from resistors R3, R1, and R2 via a constant voltage transistor Tr1. Normally, the contact of the switch 92 is on the a side, so the anode terminal of the diode D1 is at zero potential, the transistor Tr2 is turned off, and the inner microphones M1 and M2 are working. When trying to record with these inner microphones M1 and M2, when the aforementioned solenoid 42 is energized during power assist, the contact of switch 2 is pushed to the b side, and the base of transistor Tr2 is connected to resistor R5 and diode D.
1. Current flows through resistor R4 and the transistor
Tr2 turns on, the collector drops to zero potential, power is no longer supplied to the inner microphones M1 and M2, and they no longer operate. When power assist is completed, the contact of switch 2 moves to the a side and diode D1
The anode of becomes zero, resistor R4, capacitor C
1. The charge in the capacitor C1 is discharged by the time constant of the base and emitter resistors of the transistor Tr2, the transistor Tr2 is turned off, and the inner microphones M1 and M2 start operating.

As described in the above embodiments, the present invention is designed to stop the pressure contact between the pressure roller and the capstan, the take-up turntable and the idler, and the head and the tape until the playback or recording state is locked, and then release them instantaneously. To,
This is convenient because there are no accidents such as abnormalities in tape speed or scratches on the tape due to timing discrepancies.

[Brief explanation of drawings]

FIG. 1 is a plan view of the embodiment of the present invention in a stopped state, FIG. 2 is a plan view of the reel base board of FIG. 1, and FIG.
Figure A is a sectional view taken along line A-A in Figure 2, and Figure 2 B is taken along line B-B.
Cross-sectional view, Figure 2 C is CC cross-sectional view, Figure 2 D is D
-D sectional view, FIG. 2E is an E-E sectional view, FIG. 5
The figure is a plan view corresponding to figure 3 during playback, figure 6 is a plane view when selecting a song, figure 7 is a plan view of the drive system when selecting a song,
8 is a plan view showing the relationship between the head board 3 and the power assist lever 28 shown in FIG. 3 in a stopped state, FIG. 9 is a plan view showing parts arranged further below in FIG. The figure is a correspondence diagram during playback, and FIG. 11 is a circuit diagram. 3... Head board, 5... Pressure roller arm,
20... Pressure roller, 23... Recording/playback head, 28
...Power shift lever, 29...Roller, 30
...Timing arm, 34...Lock lever,
38... Power shift gear, 39... Flywheel, 40... Lock lever, 42... Regeneration solenoid, 70... Solenoid, 72... Solenoid lever, 73... Relay lever, 74... Drive lever, 76... Idler slider, 77...Idler, 81...Take-up side turntable, 88...
Shaft, 89a...gear part, 89b...cam part, 91...tape.

Claims (1)

[Scope of utility model claims] During the regeneration operation, the first solenoid is energized to unlock the power shift gear, connect the gear to the flywheel, rotate the gear, and move the power shift member in conjunction with the rotation to move the member to a predetermined position. At the same time, a control mechanism moved by another solenoid that is energized from the time of regeneration operation until the power shift member is locked moves the capstan from the pressure roller and the drive side idler from the winding side turntable. The head is held at a position apart from the tape, and when the power shift member is locked, the holding by the other solenoid is released and the capstan, drive side idler, and head are respectively held by the pressure roller and the take-up side turn. A tape recorder characterized by being brought into playback mode by being brought into instantaneous pressure contact with a table and a tape.