JPS5843067Y2 - Shut-off mechanism of recording/playback device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a shutoff mechanism for a recording/reproducing device.

In a cassette tape recorder, the magnetic tape is wound around a reel with its ends fixedly attached to the reel.

Therefore, once all the tape has been unwound from one reel and wound onto the other reel, the reel will no longer be able to rotate, and the reel stand will also stop rotating.

Therefore, a shutoff mechanism has already been proposed that detects the stoppage of the reel stand and performs a shutoff operation.

Among these shutoff mechanisms, mechanical ones are
Many of them cause periodic load fluctuations, which causes wow and flutter.

The present invention is aimed at correcting such problems, and there is a risk that periodically fluctuating loads are substantially applied to the reel shaft. It is designed to provide the best of both worlds.

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

A motor 1 for driving this tape recorder is attached to the rear chassis 3 of a pair of parallel chassis 2 and 3 (see Fig. 7), and is shown in Fig. 1. A motor pulley 4 attached to the output shaft of the motor 1 is connected to a counter pulley 5 by a belt 6.

This counter pulley 5 is fixed to a rotating shaft 7, and a worm 8 is fixed to the rotating shaft 7.

This worm 8 meshes with a worm gear 9.

That is, this worm gear 9 is rotatably supported by a pair of bearings 10 attached to the chassis 2.

A rotary body 11 having a cylindrical shape is integrally connected to the worm gear 9, and a wide portion 12 and a narrow portion 13 having different widths in the axial direction are formed on the outer circumference of the rotary body 11.
A guide groove 14 is formed.

Further, a pressing pin 15 having a recessed portion 15a is protruded from approximately the center of the wide portion 12 of the guide groove 14 in the width direction.

On the side of this rotating body 11 is an IJ-rule stand 1 on the winding side.
6 are arranged.

At the bottom of this reel stand 16, as shown in FIG.
A detection lever 17 is provided.

This detection lever 17 constitutes the detection portion of the shutoff mechanism together with the rotating body 11.

A long hole 18 is formed in this detection lever 17, and a reel shaft 19 that supports the reel stand 16 passes through this long hole 18.

Hey, this reel shaft 19 and reel stand 16 are fixed.

A spring receiver 20 and a coil spring 21 are interposed between the detection lever 17 and the reel stand 16.

A long hole 22 is formed in the spring receiver 20, through which the reel shaft 19 passes.

Although a small hole 23 is formed in the spring receiver 20 of the octopus, a pin 24 provided on the detection lever 17 engages with this small hole 23 to prevent the spring receiver 20 from rotating. There is.

Further, a pressed pin 26 is integrally formed on a slender and extending arm 25 that is connected to the detection lever 17 .

This pressed pin 26 is placed in the guide groove 14 of the rotating body 11.

Further, a disc 27 is disposed at the bottom of this detection lever 17. This disc 2T is fixed to the reel shaft 19, so that it rotates together with the reel stand 16. .

The detection lever 17 is pressed by a coil spring 21 to come into frictional contact with a disc 27, thereby receiving a rotational force in the rotational direction of the reel stand 16.

An intermediate lever 28 is provided on the side of the reel stand 16.

This lever 281d is rotatably supported by a pin 29 implanted in the chassis 12, and is biased by a coil spring 30 to rotate counterclockwise about the pin 29 in FIG.

However, the stopper 31 prevents the lever 28 from rotating beyond a predetermined amount.
It is blocked by.

A pin 32 is implanted at one end of this lever 28.
is engaged with a long hole 33 formed in the detection lever 17 in an arc shape.

A pin 34 is implanted at the other end of the intermediate lever 28, and a long hole 34a formed at one end of the shut-off lever 35 is engaged with this pin 34.

A pair of elongated holes 36 and 37 are formed in the shut-off lever 35, and guides 38 and 39 provided on the chassis 2 are fitted into the elongated holes 36 and 37, respectively. In Figure 1, it is supported so that it can slide up and down.

As shown in FIG.
A cam portion 41 is formed.

Further, a suppressing portion 4 protruding from the upper portion of the second cam portion 41
2 is formed.

Further, a pin 43 is installed near the lower end of this lever 35.

Further, a coil spring 44 is interposed between the lever 35 and the chassis 2 and on the outer periphery of the guide 39 (see FIG. 7).

Also, the lower end of this shut-off lever 35 is connected to a lock plate 45.
A suppressing portion 47 is configured to press a suppressed portion 46 that is formed to protrude from the side.

Support shafts 48 and 49 are connected to the lock plate 45, and the support shafts 48 and 49 are rotatably supported by a pair of bearings 50 and 51 fixed to the chassis 3.

The distance between the step portions 52 and 53 at the base of this support shaft 48 and 49 is configured to be shorter than the distance between the end faces of the opposing bearings 50 and 51, and for this reason, the lock plate 45 is It is configured to be slidable also in the axial direction of 48.49.

The support shaft 48 is located between the bearing 50 and the stepped portion 52.
A coil spring 54 is interposed on the outer periphery of the lock plate 45, and the lock plate 45 is slidably biased to the right in FIG.

button This coil spring 54 moves the lock plate 45 in the locking direction (
In FIG. 7, it is also urged to rotate (counterclockwise about the support shaft 48).

An engagement plate 5 is provided at the tip of the support shaft 48 of this lock plate 45.
5 is fixed.

A rectangular engagement hole 5 formed in this engagement plate 55
The tip of a lever 57 is loosely fitted into the lever 6 .

The other end of this lever 57 is connected to a rod 59 and a pin 60 of a plunger solenoid 58 supported on the back of the chassis 3.
are connected by.

(See Figure 13). Therefore, this plunger solenoid 5
8 is biased, the lever 57 rotates about the protrusion 61 fixed to the chassis 3, and moves the lock plate 45 to the left in FIG. 1 against the coil spring 54 via the engagement plate 55. It is configured so that it can be slid in either direction.

Further, a recess 62 is formed in the side of the support shaft 49 of the lock plate 45.

A pressing portion 65 of a release lever 64 rotatably supported by a pin 63 fixed to the chassis 3 is loosely fitted into the recess 62 .

This lever 64 has an L-shape, and a notch 66 is formed at the other end of this lever 64.

A pin 43 fixed to the shut-off lever 35 is fitted into this notch 66.

Therefore, when the shutoff lever 35 moves downward in FIG.
The lock plate 45 is configured to be rotated clockwise around 3 to slide the lock plate 45 to the left.

Further, as shown in FIG. 3, this lock plate 45 has 5
Two lock claws 67, 68, 69, 70°71 are formed.

These lock claws 61°, 68, 69, 70, and 71 correspond to the stop button, rewind button 72, play button 73, fast forward button, and record button, respectively, and lock these buttons in the forward rotation position. It is supposed to be done.

Note that the claw 67 corresponding to the stop button is configured to be relatively long in the vertical direction in FIG. 1 because it is not necessary to lock the stop button.

Further, the lock claw 68 corresponding to the rewind button 72 is configured to have a relatively short width so that the lock can be released by sliding in the axial direction of the support shafts 48 and 49 of the lock plate 45.

A long hole 75 is formed in the rewinding lever 14 disposed corresponding to the rewinding button 72, and is slidably supported by a guide 76 fixed to the yarn 2.

Note that a suppressing portion 77 is bent and connected to the side of the lever 74.

An intermediate lever 78 is disposed below this lever 74 and is rotatably supported by a pin 79 fixed to the chassis 3.

Further, this lever 78 is connected to an elastically deformable arm 81 connected to a synthetic resin body 80 fixed to the chassis 3.
It is urged to rotate counterclockwise about the pin 79 in FIG.

When the rewinding lever 74 moves forward, one end of the intermediate lever 78 is pressed by the pressing portion 77 of the lever 74, and rotates against the arm 81 to close the pin 79. .

The other end of the intermediate lever 78 is in contact with one end of the switching lever 82, and the switching lever 82 is rotatably arranged around a pin 83 fixed to the chassis 3.

A pressing portion 84 is formed at the other end of this lever 82.
The forward rotation of the switching lever 82 presses the first cam portion 40 of the shut-off lever 35, causing the shut-off lever 35 to rotate in a direction perpendicular to its surface as shown in FIG. It looks like this.

On the right side of the shut-off lever 35 in FIG.
is installed.

A pair of elongated holes 86 and 87 are formed in this lever 85, and a pair of guide pins 88 and 89 fixed to the chassis 2 are fitted into these elongated holes 86 and 87, as shown in FIG. It is supported so as to be slidable in the vertical direction, and is pulled downward by a coil spring 90.

A rectangular opening 91 is formed in the absentee recording lever 85 of the octopus, and the tip of an absentee recording operation button 92 is loosely fitted into this opening 91.

Therefore, when the operating button 92 is rotated, the lever 85 is moved upward against the coil spring 90.

A lock lever 93 is rotatably supported by the guide pin 88, and is urged to rotate counterclockwise by a coil spring 94.

This lock lever 93 has a straight flat part 95 and a notched lock part 96 formed on its lower side. A lock pin 97 is fixed to the lever 85.

Also, this absence recording lever 85 has a pair of pressing portions 98.9.
9 is formed by bending.

The first pressing portion 98 is for retracting the pinch roller 100, and the second pressing portion 99 is for retracting the reel stand 16.
This is for separating the idler 102 from the ground.

An L-shaped switching lever 103 is disposed on the side of Homata's absence recording lever 85 and is biased to rotate counterclockwise about a pin 105 by a coiled spring 104.

A pressed portion 106 formed at one end of this lever 103 is pressed by an arm 107 of the lock lever 93, and a pressed portion 108 at the other end of this lever 103 is pressed by the arm 107 of the lock lever 93. The shut-off lever 35 is rotated in a direction perpendicular to the surface of the shut-off lever 35 by pressing the cam portion 41 of the shut-off lever 35 (see FIG. 18).

Next, the operation of this tape recorder with the above configuration will be explained.

First, the shutoff operation for switching to the playback mode will be described with reference to FIGS. 5 to 7.

In the reproduction mode, as shown in FIG. 5, the reel stand 16 on the winding side rotates counterclockwise, and the magnetic tape is wound by the reel that engages with this reel stand 16.

Therefore, even if the disc 27 fixed to the reel stand 16 via the reel shaft 19 also rotates, the detection lever 17, which is pressed by the coil spring 21 and is in frictional contact with the disc 27, is in the fifth position. As shown in the figure, the reel receives rotational force in a counterclockwise direction about the reel shaft 19.

Therefore, the pressed pin 26 implanted in the arm 25 of the detection lever 17 is placed in the fifth position of the guide groove 14 of the rotating body 11 which is rotationally driven by the motor 1 via the counter pulley 5, the worm 7 and the worm gear 9. As shown in the figure, the button comes into contact with the left wall portion, and this pressed pin 26 does not come into contact with the pressing pin 15 formed in the guide groove 14.

Note that when the reel stand 16 is rotated clockwise, that is, in the rewind mode, the detection lever 1γ receives a clockwise rotational force about the reel shaft 19, as shown by the imaginary line in FIG. 25 pressed pins 2
6 is in contact with the right wall portion of the guide groove 14, and even in this case, the pressed pin 26 does not come into contact with the pressing pin 15.

However, when all the magnetic tape is fed out from the reel on the feed side and wound on the reel on the take-up side, both ends of the magnetic tape are fixed to the reels, so
A large load is suddenly applied to the reel stand 16, and the reel stand 16 stops rotating due to the torque limiter mechanism.

For this reason, the rotational force applied to the detection lever 17 is also released.

The pressed pin 26 of the detection lever 17 is regulated by the narrow portion 13 of the guide groove 14 of the rotating body 11, and the detection lever 17 remains stationary with the arm 25 facing upward as shown in FIG. .

Therefore, the pressed pin 26 relatively moves approximately at the center of the guide groove 14 in the width direction.

For this reason, the recess 15a of the pressing pin 15 located approximately at the center in the width direction of the wide portion 12 of the guide groove 14 engages with the pressed pin 26 and presses the pressed pin 26.

Since the reel shaft 19 passes through the elongated hole 18 of the detection lever 17, when the suppressed pin 26 is pushed, the detection lever 17
moves upward in FIG.

Then, the intermediate lever 28, which is connected to the detection lever 17 via the pin 32, rotates clockwise about the pin 29, as shown in FIG. 6, against the coil spring 30.

For this purpose, a shutoff lever 35 connected to this intermediate lever 28 via a pin 34 is connected to the guides 3B, 3
9, the lever 35 moves downward as shown in FIG. 6, and the suppressing portion 4γ at the lower end of the lever 35 presses the pressed portion 46 of the lock plate 45 as shown in FIG.

Therefore, the lock plate 45 rotates clockwise in FIG. 7 about the support shafts 48 and 49 against the coil spring 54.
The playback button 73, which has been locked by the lock portion 69 of the lock plate 45, is rotated back to release the playback mode and enter the stop mode.

Similarly, when the shutoff operation is performed in other modes, such as fast forward mode or recording mode, the lock plate 45 is rotated and the rewind button is rotated back to enter the stop mode.

Next, the operation of autoplay will be explained with reference to FIGS. 8 to 11.

This autoplay operation involves pressing and operating both the playback button 73 and the rewind button 72 to lock them and rewind the magnetic tape.
When all the magnetic tape is rewound to the reel on the feeding side,
The rewind button 72 is automatically moved back to enter the playback mode and playback is performed.

To perform this autoplay operation, first press the playback button 73, and as shown in FIG.
9 and the pin 111 of the head substrate 101, the head substrate 101 is pulled upward via the coil spring 112 stretched between the coil spring 112 and the pin 111 of the head substrate 101.

Therefore, the long hole 113 and notch 11 of the head substrate 101
The head substrate 101 moves upward while being guided by the guide pins 115 and 116 that are engaged with the head substrates 4 and 4.

For this purpose, the erasing head 117 and the recording/reproducing head 118 attached to the head substrate 101 are connected to the cassette 120.
contact with the magnetic tape inside.

Further, as the head substrate 101 moves forward, the protruding piece 119 of the head substrate 101 is separated from the bent piece 123 of the arm 122 of the pinch roller lever 121, and the pinch roller lever 121 is moved by the coil spring 124 to
Pinch roller 1 rotates clockwise around 25.
06 is in pressure contact with the capstan 126, and the magnetic tape is fed at a constant speed.

Note that this pinch roller lever 121 is equipped with another arm 12.
7 are long and connected.

Further, due to the forward movement of the regeneration lever 110, the idler lever 128 is moved around the pin 130 by the coil spring 129 through an operation mechanism (not shown) in FIG.
The idler 102 rotates counterclockwise, and the idler 102 comes into contact with the reel stand 16.

For this purpose, the reel stand 16 is rotationally driven via the idler 102, and the reel engaged with the reel stand 16 winds up the magnetic tape fed at a constant speed.

When the playback button 73 is pressed and the rewind button 72 is pressed, the rewind lever 74 is pressed and moved forward, and the pressing portion 77 of the lever 74 is pressed against the intermediate lever. Press one end of 78 to release this lever 78.
The eighth arm 810 resists the elasticity with the pin 79 as the center.
Rotate clockwise in the figure.

Then, the side part of this arm 81 pushes the pin 131 implanted on the back surface of the head board 101 and pushes the head board 101.
to retreat.

The head substrate 101 is guided by guide pins 115 and 116 against the coil spring 112 and moves back by a slight amount.

Then, the heads 117 and 118 are separated from the magnetic tape.

Also, due to the backward movement of the head substrate 101, the protruding piece 119
presses the bent piece 123 and moves the pinch roller lever 121 into the eighth position around the pin 125 against the coil spring 124.
Rotate counterclockwise in the figure.

For this reason, the pinch roller 100 is separated from the capstan 126, and constant speed feeding of the magnetic tape is canceled.

By the forward movement of the twisted rewinding lever 74, this lever 74
The upper pin 132 presses an arm 133 connected to the idler lever 128 to rotate the lever 128 clockwise about the pin 130 against the coil spring 129.

For this reason, the idler 102 is separated from the reel stand 16, and the transmission of rotational force to the reel stand 16 is cut off.

Further, as the rewinding lever 74 moves forward, the idler comes into contact with the reel stand on the feeding side via an operating mechanism (not shown), and the magnetic tape is rewound onto the reel engaged with this reel stand.

Note that this mode is generally called a review mode.

Then, while the playback button 73 is locked in the forward position and the playback lever 110 is moving forward, the rewind button 72 is
is locked in the forward position and the rewinding lever 74 moves forward, the pressing portion 77 of this lever 74 presses one end of the intermediate lever 78 and moves the lever 78 around the pin 79 as shown in FIG. Rotate clockwise.

Then, the other end of the intermediate lever 78 pushes one end of the switching lever 82 to rotate the lever 82 counterclockwise about the pin 83 as shown in FIG.

Then, the pressing portion 84 of this lever 82 presses the first cam portion 40 of the shut-off lever and moves upward along the inclined surface of this cam portion 40.

For this purpose, the shut-off lever 35 rotates against the coil spring 44, as shown in FIG. 10, about the guide 38 in a direction perpendicular to the plane thereof and clockwise in FIG.

For this purpose, the suppressing portion 47 at the lower end of the shut-off lever 35
moves to a position where it does not face the pressed portion 46 of the lock plate 45.

In this state, the magnetic tape is rewound.

When the magnetic tape is completely rewound from the reel that engages with the reel stand 16 on the take-up side to the reel that engages with the reel stand on the payout side, the reel stand 16 stops and is activated by the shut-off mechanism described above. As shown in FIG. 11, the detection lever 17 is pulled upward, and the intermediate lever 28 rotates clockwise about the pin 29 against the coil spring 30 as shown in FIG.

Then, the shut-off lever 35, which is connected to this lever 28 by a pin 34, is guided by guides 38 and 39 and moves downward.

However, as described above, since the shut-off lever 35 is rotated in its surface direction by the switching lever 82, the pressing portion 47 of this lever 35 is pressed against the pressed portion 47 of the lock plate 45.
is not pressed, and the lock is not released by rotation of the lock plate 45.

However, the downward movement of the shut-off lever 35 causes the release lever 64, which is associated with this lever 35 through the pin 43, to pivot about the pin 63, as shown in FIG.

Therefore, the pressing portion 65 of the lever 64 presses the recess 62 of the lock plate 45 to press the lock plate 45 to the left in the axial direction of the support shafts 48 and 49.

For this reason, the lock plate 45 resists the coil spring 54 and
As shown in Figure 1, move to the left.

This movement of the lock plate 45 causes the rewind button 7 to be locked by the narrow lock claw 68 of the lock plate 45.
2 is released, and the rewind lever 74 moves back.

However, the playback button 13, which is locked by the wide lock claw 69 of the lock plate 45, cannot be unlocked.

Therefore, the regeneration lever 110 maintains the forward movement state.

For this reason, the tape recorder is automatically switched to playback mode, and the rewound magnetic b-tape is played back from the beginning.

Next, Figures 12 and 13 show the operation of memory play.
This will be explained using figures.

The operation of memory play is to memorize the part you want to repeat repeatedly in a memory counter etc. during recording or playback, and when rewinding, the magnetic tape is stopped at this memorized position and automatically switched to playback mode. It is an action.

Therefore, in order to perform this memory play operation, the first part of the position desired to be repeatedly heard is stored in advance in a memory counter (not shown).

In this state, rewind is performed with the playback button 73 and rewind button 72 pressed and locked in the same manner as in the autoplay operation described above.

Also, at this time, close the autoplay switch (not shown).

When the magnetic tape is rewound in this manner, when the magnetic tape is rewound at the position stored by the memory counter, the plunger solenoid 58 is powered on, as shown in FIGS. 12 and 13. like rod 59
is attracted to the right.

Then, the lever 57, which is connected to the rod 59 by the pin 60, rotates counterclockwise in FIG. Coil splash to the left 5
Move against 4.

Then, the rewind button 72 locked by the narrow lock claw 68 of the lock plate 45 is unlocked.

However, the playback button 73, which is locked by the wide lock claw 69 of the lock plate 45, is not unlocked.

For this reason, the rewind mode is automatically switched to the playback mode, and playback is performed from the pre-stored position.

Next, the memory stop operation will be described. This operation can be performed by storing the data in the memory counter and then pressing only the rewind button 72 to perform rewind.

Then, when the magnetic tape is rewound to the position memorized by the memory collar, power is applied to the plunger solenoid 58, thereby causing the lock plate 45 to move in the axial direction of its support shafts 48 and 49.

Therefore, the rewind button 72, which has been locked by the narrow lock claw 68 of the lock plate 45, is unlocked.

Moreover, since the playback button 73 is not locked at this time, the mode is set to stop, and the tape recorder stops at a preset position.

Next, the operation of recording during an absence will be explained with reference to FIGS. 14 to 18.

As shown in FIG. 14, the setting for recording an absent message is performed by turning the absent recording button 92 while the tape recorder is in the recording mode.

When the absence recording button 92 is rotated, the absence recording lever 85
is guided by the guide pins 88 and 89 against the coil spring 90 and moves upward as shown by the imaginary line in FIG.

Then, the pressing part 98 of this lever 85 presses the arm 127 of the pinch roller lever 121 and moves the lever 121 of the lever 121 to the first position around the pin 125 against the coil spring 124.
Rotate counterclockwise in Figure 4.

Then, the pinch roller 100 supported by this lever 121 is separated from the capstan 126.

Further, by moving the absentee recording lever 85 upward, the pressing portion 99 of this lever 85 is pressed against the pin 13 of the switching lever 134.
5 to move this switching lever 134 to the fulcrum pin 13.
Rotate counterclockwise around 6 as shown in Fig. 14.

Then, the pressing portion 137 at the other end of the switching lever 134 presses the cam 138 connected to the idler lever 128, and moves the idler lever 128 clockwise in FIG. 14 about the pin 130 against the coil spring 129. Rotate it.

Therefore, the idler 102 is separated from the reel stand 16.

Also, when the absence recording lever 85 moves upward, the lock pin 97H of this lever 85H, the flat part 9 of the lock lever 93
5, and when it reaches a position facing the lock portion 96, the lock lever 93 is rotated counterclockwise in FIG. 15 about the pin 88 by the winding spring 94, and the lock pin 97 is falls into the recess 96.

Therefore, in this state, the absence recording lever 85 is locked.

Then, by rotating the lock lever 93, this lever 93
The arm 107 is the pressed part 106 of the switching lever 103.
is pressed to rotate this lever 103 clockwise in FIG. 15 about the pin 105 against the coil spring 104.

Then, the pressing portion 108 of this lever 103 presses the inclined surface of the second cam portion 41 of the shut-off lever 35 and rides on this cam portion 41 .

For this purpose, as shown by the dashed line in FIGS. 16 and 17, the shutoff lever 35 is moved in a direction perpendicular to the surface of the coil spring 44 (counterclockwise in FIG. 17 with the guide 38 as the center). direction).

Therefore, the suppressing portion 47 of the shut-off lever 35 moves to a position where it does not face the pressed portion 46 of the lock plate 45.

With the above steps, the settings for the answering machine recording are completed.

In this state, a timer (not shown) is set to a predetermined time.

Then, at this time, the timer turns on the power to the tape recorder, and the motor 1 starts rotating.

However, since the idler 102 is spaced apart from the reel stand 16, the reel stand 16 does not rotate.

The stoppage of the reel stand 16 is detected by the detection lever 17, and as described above, the detection lever 17 moves, and the intermediate lever 28 moves the coiled spring 3 around the pin 29.
18, and the shut-off lever 35 moves downward as shown in FIG.

However, this shut-off lever 35 does not press the pressed portion 46 of the lock plate 45, as shown by the two-dot chain line in FIG. 17, and the lock plate 45 does not rotate.

Therefore, the lock of the recording button is not released. However, as the shut-off lever 35 moves downward, the pressing portion 42 of the lever 35 changes over the pressing portion 10 of the switching lever 103.
8 to rotate this lever 103 counterclockwise around the pin 105.

Then, the pressed portion 106 of the switching lever 103 presses the arm 107 to rotate the lock lever 93 clockwise in FIG. 18 about the pin 88 against the winding spring 94.

Therefore, the lock pin 97 releases the lock on the absence recording lever 85, and the lever 85 is moved back by the coil spring 90.

When the absence recording lever 85 moves back, the pressure by the pressing portion 98 of the arm 127 of the pinch roller lever 121 is released, and the lever 121 is moved clockwise around the pin 125 by the coil spring 124 as shown in FIG. Rotating, the pinch roller 100 is pressed against the capstan 126, and the magnetic tape is fed at a constant speed.

Further, by the return movement of the absence recording lever 85, the pressure by the pressing portion 99 of the switching lever 134 is also released, and this lever 134 rotates clockwise around the pin 136.
As a result, the idler lever 128 is activated by the coil spring 129.
When the idler 102 rotates counterclockwise, the idler 102 comes into contact with the reel stand 16 and transmits rotational force.

For this purpose, the magnetic tape is wound onto a reel that engages with this reel stand 16, a recording mode is displayed, and recording is performed while the user is away.

Although the present invention has been described above with reference to embodiments, the present invention is not limited to the above embodiments, and various modifications can be made based on the technical idea of the present invention.

As described above, the present invention has a simple structure and a reel. The detection lever moves reliably when the table stops and does not cause malfunction.

Since the conversion lever that releases the lock of the operating lever by the twisted lock plate engages with the second elongated hole portion of the detection lever, which has a substantially circular arc shape, the conversion lever rotates at the same time as the detection lever slides. Therefore, the responsiveness of the shutoff operation is very good, and the engagement between the detection lever and the conversion lever is reliable, so the operation is even more reliable.

When the reel stand rotates, the reel shaft comes into contact with one end of the first elongated hole due to the biasing force of the spring, and in this contact state, the second reel shaft extends in an arc shape centered on the reel shaft. The converting lever was coupled to the detection lever by slidably engaging one end of the converting lever with the elongated hole, and the spring was disposed between the converting lever and the fixing member.

Therefore, even if the detection lever reciprocates around the reel axis as the reel base rotates, the conversion lever does not substantially move. There is no possibility that the side pressure applied to the shaft will vary substantially with the rotation of the reel stand, and therefore wow and flutter can be effectively prevented.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a front view of the main parts of the cheap coater, Fig. 2 is an exploded perspective view of the shut-off mechanism, and Fig. 3 shows the switching mechanism of the shut-off lever. Figure 4 is a perspective view of the lock plate, Figure 5 is a front view showing the operation of the shut-off mechanism while the tape is running, Figure 6 is an exploded perspective view of the lock plate as seen from the back, Figure 6 shows the shut-off mechanism operating. Fig. 7 is a front view showing the state, Fig. 7 is a side view of the same, Fig. 8 is a front view of main parts showing the operation of auto play setting, and Fig. 9 is a main part showing the switching operation of the shut-off lever associated with auto play setting. 10 is a side view of the same, FIG. 11 is a front view of the main part showing the auto play operation, FIG. 12 is a front view of the main part showing the operation of the lock plate during the memory play operation, and FIG. 13 is a bottom view of the same, FIG. 14 is a front view of the main part showing the operation of setting the answering recording, FIG. 15 is a front view of the main part showing the switching operation of the shut-off lever accompanying the setting of the answering Fig. 15 is a sectional view taken along the line XVI-XVT, Fig. 17 is a side view of the main part showing the switching operation of the shut-off lever associated with the setting of the answering machine, and Fig. 18 is a front view of the main part showing the operation of the answering machine. It is. In other words, in the symbols used in the drawings, 11
1 is a rotating body, 12 is a wide width portion, 13 is a narrow width portion, 14 is a guide groove, 15 is a pressing pin, 16 is a reel stand on the winding side, 1
7 is a detection lever, 19 is a reel shaft, 26 is a pressed pin,
28 is an intermediate lever, 30 is a coiled spring, 32 is a pin, and 33 is a long hole.

Claims (1)

[Claims for Utility Model Registration] A reel stand that supports a reel on which a recording medium is wound, a reel shaft that rotatably supports the reel stand, and a reel shaft that is rotatable and slidable with respect to the reel shaft. A detection lever that is supported pivotally and receives rotational force from the reel stand, a suppressed portion provided on the detection lever, a rotating body that rotates regardless of whether the reel stand rotates or stops, and an outer peripheral portion of the rotating body. a guide groove formed in the circumferential direction and in which a wide width portion and a narrow width portion having different widths are continuously formed in the axial direction; It consists of a pressing protrusion having a concave portion and a spring that biases the detection lever in the sliding direction. When the reel stand is rotating, the detection lever receives rotational force from the reel stand and the lever is covered. When the rotating body rotates with the suppressing part in contact with one edge in the width direction of the guide groove of the rotating body and the reel stand stops, the detection lever is no longer subjected to rotational force by the reel stand. The pressed portion of the detection lever is regulated by the narrow portion of the guide groove of the rotating body, and the suppressed portion engages with the recess of the suppressing protrusion of the rotating body, and is pressed by the suppressing protrusion to detect the detection lever. A shut-off mechanism for a recording/reproducing device in which a lever slides against the biasing force of the spring, and the conversion lever is moved by the sliding of the detection lever to release the lock of the operating lever by the lock plate. , the detection lever includes: (a) a first elongated hole extending in the sliding direction of the detection lever and into which the reel shaft is fitted; (b) the reel shaft due to the biasing force of the spring; are in contact with one end of the first elongated hole, and a second elongated hole extends in an arc shape centered on the reel axis, and the second elongated hole is in contact with one end of the first elongated hole. A part of the conversion lever is slidably engaged with the elongated hole, and the spring is disposed between the conversion lever and the fixed member, so that the biasing force of the spring is applied to the second A shutoff mechanism for a recording/reproducing device, characterized in that the shutoff mechanism is configured to transmit information to the detection lever via an elongated hole.