JPS5914916Y2 - Operation mechanism of tape recorder - Google Patents

Description

[Detailed description of the invention] The present invention relates to the operation mechanism of a tape recorder, and includes a recording release position between the stop position of the locking mechanism and the rewinding position, where only the lock of the recording knob can be released while the tape is stopped. An object of the present invention is to provide an operation mechanism for a tape recorder that can reliably prevent the inconvenience of rewinding the tape at the same time as recording is canceled.

For example, in a tape recorder for dictation recording, the tape running mode can generally be switched between three modes (forward, stop, and rewind) by operating a single operation knob, and the recording mode can be changed by operating a recording knob that is separate from the operation knob. This is a configuration that switches to playback.

Therefore, for example, when recording, the recording knob is pressed to lock it in the recording mode, and in this state, the operating knob is operated to run or stop the tape so that necessary parts can be recorded at any time.

However, with this type of tape recorder, the recording knob on the recording mode side cannot be unlocked unless the operation knob is moved to the rewind position when canceling recording, and as a result, part of the tape is rewound when the recording is canceled. Therefore, if you cancel recording but want to continue recording, the last part of the previously recorded content will be erased and you will not be able to play that part. Was.

Furthermore, as the tape recorder becomes smaller, the tape drive motor must also become smaller, so it is necessary to reliably transmit torque with a small amount of power. Conventionally, it has been common practice to use a structure in which this is done by meshing with a driven gear.

However, in the above-mentioned conventional tape recorder, when the operation knob is operated to switch to the rewind mode, the tape drive motor may be energized before the drive gear is securely engaged with the driven gear. This has disadvantages such as unpleasant noises being generated from the gear train when the tape starts running, and furthermore, the tape running is unstable because power transmission between the gears is not reliable.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

FIG. 1 is a plan view of an embodiment of the operating mechanism of the tape recorder according to the present invention, FIGS. 2A and B are bottom views of the operating mechanism of the tape recorder in playback mode and recording mode, respectively, and FIG. 3A , B to FIGS. 6A and 6B are bottom views of the main parts of the locking mechanism C in a state where the tape running mode is forwarded, stopped, recording canceled, and reversed, respectively.

In Figures 1 and 2, the tape recorder 1 is a handy type used for example for lip recording, and after the ultra-small cassette 2 is frozen in a predetermined position on the chassis 3, the recording knob 4 and the operation knob It is possible to record and playback by one-handed recording.

Normally, this type of cassette recorder 1 is configured so that the tape drive system can be switched between three modes: tape forwarding, tape stop, and tape rewinding by rotating the operating knob 5. However, the present invention is designed to operate in a manner other than the above three modes. A recording cancel mode has been added that allows recording to be canceled while the tape 6 is stopped and the mode to be set to playback mode.

A balancing/reproducing head 7 and a cylindrical body 8 for attaching an erasing head are provided on the upper surface of the chassis 3 along the tape running path, and the cylindrical body 8 is rotated by a certain angle by operating the recording knob 4. An erasing head 8a installed on the circumferential surface of the recording head 8a contacts the tape 6 and erases the recorded portion of the tape 6.

The cassette 2 is positioned by a pair of cassette guides 9 and 10 and placed in a predetermined position on the chassis 3. At this time, the rewind reel and the take-up reel 1"
to fit.

A gear 13 serving as a reel stand is fixed to the shaft 11 on which the rewind reel fits, and this gear 13 meshes with a driven gear 14.

- A disk-shaped rotor 15 with a larger diameter than the above-mentioned library 13 is integrally attached to the shaft 12 on which the ten-thousand take-up reel is fitted, and the circumferential surface of this rotor 15 is made of a rubber material with a large friction coefficient C. etc. are fixed in a band shape.

This rotor 15 serves as a reel stand on which a take-up reel is placed.

The tape drive motor 16 is connected to an arm 17 as shown in FIG.
The flywheel 18 is connected via a belt 19 to a flywheel 18 supported at the tip of the flywheel 18 .

The arm 17 has an L-shape and is pivotally supported by a pin 17H implanted on the lower surface of the chassis 3 so as to be able to swing within a predetermined angular range, and is biased clockwise in FIG. 2 by a spring 17b. There is.

The shaft supporting the flywheel 18 is used as a capstan 20 for driving the rotor 15, and the capstan 20 has a motor 1 that meshes with the driven gear 14.
A drive gear 21 that transmits six different power is integrally attached.

Therefore, when the arm 17 is rotated to the rotation limit position in the counterclockwise direction in FIG. 1, the rotor 15 is driven; When displaced, the gear 13 is rotationally driven via the driven gear 14.

Here, in addition to the capstan 20, a pin 22 is provided on the upper surface of the arm 17, and a stopper portion 23 formed by drilling a groove in the chassis 3 allows the pin 22 to rotate clockwise in FIG. Regulate the limit position.

When the pin 22 abuts and locks on the stopper portion 23, the driving gear 21 meshes with the driven gear 14 in a normal meshing state, that is, in a state where the teeth mesh with each other at an appropriate depth.

□24 is a brake plate, which is pivotally supported on a pin 25 implanted on the lower surface of the chassis 3. Depending on the rotational displacement position of the brake plate, the brake part 24a comes into contact with and separates from the circumferential surface of the rotor 15, and the rotor 15 Brake or release the brake.

The arm 17 and the brake plate 24 are respectively connected to one end of levers 27 and 28, which are coaxially supported on a shaft 26 installed on the lower surface of the chassis 3, and are rotated according to the rotational displacement position of the levers 27 and 28. and are oscillated to respective predetermined positions.

Both ends of a spring 29 wound around the shaft 26 are locked to one end of the lever 27 so as to cross each other.
One end of 9 is in contact with the tip of an adjustment screw 30 attached to arm 17.

Therefore, the more the lever 27 is rotated in the clockwise direction in FIG.
The force that urges 7 in the counterclockwise direction in the figure also becomes large.

One end of the lever 28 is connected to the brake plate 24 via a rod 31, and when the lever 28 is rotated clockwise in FIG. 2, the brake plate 24 is also rotated in the same direction to release the brake. It is said to be in a state of

The other ends of these pair of levers 27 and 28 are provided with pins 2 and 2, respectively.
7a and 28a are implanted, and these pins 27a.

28a engages with cam grooves 33 and 34 formed on the upper and lower surfaces of the locking plate 32, respectively.

The locking plate 32 is provided integrally with the operation knob 5 and is rotatably supported on a pin 35.

There are four engaging grooves 32 on the circumferential surface of the locking plate 32 corresponding to four locking positions, that is, feed, stop, recording release, and rewind.
a, 32b, 32c, and 32d, and a pin 36a implanted at one end of the locking arm 36 is -
It is engaged and locked in the engagement groove of.

One end of a spring 37 is locked to the other end of the locking arm 36, and the locking arm 36 is biased clockwise in FIG. 2 by the spring 37.

Here, in the forward position and the stop position, the locking plate 32 is locked in that position even if you release your hand from the operating knob 5, but in the recording release position and the rewinding position, the operating knob 5
When the hand is released, the locking plate 36 is returned to the locking position by the force of the spring 37.

Further, the locking plate 32 is connected to the lock lever 3 via a rod 38.
In the recording release position and the rewinding position, the rod 38 rotates the lock lever 39 counterclockwise in FIG. 2, so that the lock lever 39 unlocks the recording knob 4.

On the other hand, when the locking plate 32 is in the feed position and the stop position, the distance between the locking plate 36 and the lock lever 39 is smaller than the length of the rod 38, so the end of the rod 38 is It does not engage the lock lever 39.

Therefore, the recording knob 4 maintains the recording mode position regardless of the rotational displacement of the locking plate 32.

Reference numeral 40 denotes an engagement recess for opening and closing the switch, which is integrally provided in the locking plate 32, and is engaged with the end of the contact piece 41a of the switch mechanism section 41 shown in FIGS. 3B to 6B. There is.

In addition to the contact piece 41 a, the switch mechanism section 41 is provided with two contact pieces 41 b and 41 C, and the contact piece 41 a contacts the contact piece 41 b or 41 C to conduct each other.
As a result, the motor 16 is energized and started.

The recording knob 4 is provided on the lower surface of the chassis 3 so as to be movable within a predetermined range in the left and right directions in FIGS.

A pin 43 that engages with the guide hole 42 of the recording knob 4 is rotatably provided with an arm shaver, and the arm 44 controls the displacement of the recording knob 4 via a pin 45 implanted on the top surface of the recording knob 4. communicated.

Reference numeral 46 denotes a slide plate, to which the displacement of the arm is transmitted via a pin 47 implanted on its upper surface, and is displaced in the opposite direction to the direction of displacement of the recording knob 4.

A protrusion 46 a is formed on the side of the slide plate 46 , and the protrusion 46 a comes into contact with a pin 8 b that is implanted on the lower surface of the cylindrical body 8 and passes through a groove drilled in the chassis 3 . As the slide plate 46 is displaced, the cylindrical body 8 is rotated by a predetermined angle.

Reference numeral 48 denotes a spring that biases the slide plate 46 in the left direction in FIG.

Before using the tape recorder 1, the screwing amount of the adjustment screw 30 is adjusted so that each part operates as expected when switching the tape running mode or mode.

In this case, the following three conditions serve as guidelines for adjustment.

(2) During regeneration, the capstan 20 must be firmly pressed against the circumferential surface of the rotor 15, and the tip of the adjustment screw 30 must be spaced apart from the end of the spring 29 by an appropriate distance.

(2) When stopped, the capstan 20 is reliably separated from the circumferential surface of the rotor 15, and the driving gear 21 is reliably separated from the driven gear 14.

■ At the time of rewinding, the contact pieces 41 a, 4 of the switch mechanism section 41
The driving gear 21 meshes with the driven gear 14 at a timing earlier than when 1C is closed.

These conditions can be easily achieved with a few trials.

Next, the operation of the above-mentioned component device will be explained.

First, when playing, press the operating knob 5 with your thumb or the like to the first position.
Rotate counterclockwise to the position shown by the solid line in the figure.

As a result, the locking plate 32 integrated with the operation knob 5 is rotated clockwise in FIG. 2, and the locking arm 32 is rotated as shown in FIG.
The pin 36a at the tip fits into the retaining groove 32 on the outer periphery of the locking plate 32.
a, and the locking plate 32 is kept in this position, ie, in the regeneration position, by the force of the spring 37.

On the other hand, the pin 27a at the tip of the lever 27 is separated from the cam surface 33a of the cam groove 33 of the locking plate 32, as shown in FIG. 3A, and the lever 27 is in a state where it can freely rotate. Become.

As a result, a gap is created between the end of the spring 29 that moves together with the lever 27 and the adjusting screw 30, and the arm 17
b, and is rotated clockwise in FIG.

This allows the capstan 20 provided at the tip of the arm 17 to
comes into contact with the circumferential surface of the rotor 15.

At the same time, the pin 28a at the tip of the lever 28
As shown in FIG. 3B, since the lever 28 rides on the cam surface 34a in the cam groove 34 of the locking plate 32, the lever 28 is rotated clockwise in the figure, and the rod 31 moves the brake plate 24 as shown in FIG. Pull clockwise.

As a result, the brake portion 24a is separated from the circumferential surface of the rotor 15, and the brake of the rotor 15 is released.

Also, as the operating knob 5 is rotated, the contact piece 411 and the contact piece 4
1b contact each other, and the drive motor 16 is energized.

When the motor 16 is started, the rotary wheel 18 rotates at a constant speed via the belt 19, and the capstan 20 rotates the take-up reel shaft 12 counterclockwise in FIG.

As a result, the tape 6 in the cassette 2 is wound onto the take-up reel, and the signal recorded on the tape 6 is reproduced by the head 7.

When the operating knob 5 is returned to the stop position shown by the dashed line in FIG.
2 is held in the stopped position.

At this time, the pin 27a of the lever 27 rides on the cam surface 33b of the cam groove 33 as shown in FIG. Spring 17 due to the spring force of 29
b is rotationally displaced in the counterclockwise direction in FIG.

As a result, the capstan 20 separates from the circumferential surface of the rotor 15, and power transmission to the take-up reel shaft 12 is cut off.

Also, at the same time as the operation knob 5 is rotated, the pin 28a of the lever 28 is moved against the cam surface 34 of the cam groove 34, as shown in FIG. 4B.
b, so that the lever 28 is rotated counterclockwise in the figure.

As a result, the brake plate 24 is released from tension by the rod 31, is rotated counterclockwise in FIG. .

Therefore, power transmission to the rotor 15 is cut off from the motor 16, and the rotor 15 is braked by the brake section 24a.

Further, as the operation knob 5 is rotated, the contact pieces 41a and 41b are separated from each other, and the power to the motor 16 is cut off, so that the motor 16 also stops almost at the same time as the take-up reel shaft 12 stops rotating. Winding ends.

Here, the spring force of the spring 29 is sufficiently greater than the spring force of the spring 17b, but since the screwing amount of the adjustment screw 30 is adjusted as described above, the capstan 20
The rotor 15 and the rotor 15 face each other with a suitable gap therebetween.

When the recording knob 4 is pressed during recording, the claw portion of the lock arm 39 engages with the stepped portion of the recording knob, and the recording knob 4 is locked by the lock arm 39.

As the recording knob 4 is displaced, the pin 45 rotationally displaces the arm shaft counterclockwise in FIG. 2, so that the slide plate 46 is pushed by the arm shaft and is displaced rightward in the diagram.

At this time, the cylindrical body 8 is rotated clockwise in FIG. 2 against a spring (not shown), and the erasing head 8a embedded in the surface thereof comes into contact with the tape 6.

On the other hand, as the recording knob 4 is displaced, a recording switch (not shown) is closed, and the recording becomes possible.

Next, when the operation knob 5 is rotated to the feed position, the regeneration time mode contact pieces 41a and 41b come into contact with each other, the motor 16 is energized, the braking by the brake part 24a is released, and the take-up reel is The shaft 12 is driven in the tape winding direction, and recording is performed on the tape 6 by the recording/reproducing head 7.

When it is desired to stop the recording, the operating knob 5 can be returned to the stop position, thereby stopping the take-up reel shaft 12 and stopping the running of the tape 6, as in the case of stopping playback.

Here, since the tip of the rod 38 connecting the locking plate 32 and the lock lever 39 is not locked to the lock lever 39 due to the length of the rod 38 as described above, the operation knob 5 cannot be moved. While the lock lever 39 is being operated between and stop, the lock lever 39 does not move, and the recording knob 4 is kept in the recording mode.

Therefore, while keeping the recording knob 4 in the recording position,
You can repeatedly stop recording.

To cancel the recording state, first lightly move the operating knob 5 clockwise in FIG. 1, that is, in the tape rewinding direction.

As a result, the locking plate 32 is rotationally displaced in the counterclockwise direction in FIG. engage.

At this time, the pin 27a of the lever 27 rides on the cam surface 33C of the cam groove 33 as shown in FIG.
7 is slightly rotated clockwise in the figure by the force of the ribs 29.

However, by adjusting the adjustment screw 30 described above, the drive gear 2
1 does not reach the point where the driven gear 14 is engaged.

Furthermore, if the operation knob 5 is simply rotated to the recording release position, the contact piece 41a and the contact piece 41C will be separated as shown in FIG. 5B.
do not come into contact with each other, so the motor 16 is not energized.

On the other hand, as the locking plate 32 rotates, the rod 38 rotates the lock lever 39 counterclockwise in FIG. 2, so the engagement between the recording knob 4 and the lock lever 39 is released, and the recording knob 4 is slid back to the playback position by the force of the spring force applied to the slide plate 46.

Further, as the recording knob 4 is unlocked, the slide plate 46 also returns to the position at the time of main recording, so that the cylindrical body 8 is rotated and the erasing head 8a is separated from the tape 6.

Here, when the force applied to the operating knob 5 is released, the force of the spring 37 that locks the locking arm 36 causes the locking plate 32 to
rotates back to the stop position together with the operating knob 5.

In this way, by rotating the operation knob 5 to the recording release position, it is possible to release only the recording knob 4 without changing the tape position.This allows the tape position to be adjusted when recording is canceled like in a conventional tape recorder. It is possible to reliably prevent the inconvenience of erasing the end of the previously recorded part when recording is continued after recording has been canceled.

Next, when rewinding, the operation knob 5 is rotated from the recording release position to the rewinding position shown by the dotted chain line in FIG.

As a result, the pin 36a of the locking arm 36 is connected to the locking plate 3.
2 to the retaining groove 32d.

At this time, the pin 27a of the lever 27 rides on the cam surface 32d of the cam groove 33, which is further back than the cam surface 32C, as shown in FIG. I am forced to do it.

As a result, the spring 29 strongly presses the adjustment screw 30, and thereby the arm 17 is rotated to the rotation limit position in the counterclockwise direction in the figure, that is, the position where the pin 22 comes into contact with the stopper part 23 and is locked. do.

As a result, the driving gear 21 integrated with the capstan 20 meshes with the driven gear 14, and the gear 13 of the rewinding reel shaft 11 is in a state where power is transmitted from the driving gear 21.

Further, due to the rotational displacement of the operation knob 5, the lever 28 is displaced as shown in FIG.
4 The brake of a is released, and the contact piece 41a and the contact piece 41
C are in contact with each other and the motor 16 is energized, so the rewind reel shaft 11 transfers the power from the motor 16 to the flywheel 18, drive gear 21. The signal is transmitted to the driven gear 14 and the gear 13 in this order, and is rotationally driven in the tape rewinding direction.

Here, when adjusting the adjustment screw 30, the timing at which the driving gear 21 contacts the driven gear 14, that is, the rotation of the arm 17, is determined so that the motor 16 is energized after the driving gear 21 meshes with the driven gear 14. The spring force of the spring 29 during unwinding is adjusted to an appropriate value so that the dynamic displacement speed becomes an appropriate value.

Therefore, the motor 16 is energized before the drive gear 21 and the driven gear 14 are completely meshed, and both gears 21 and 14 are energized.
．． It is possible to reliably prevent inconveniences such as not being able to rotate the gears 21 and 14 in a normal meshing state, or generating a large amount of noise due to poor meshing between the gears 21 and 14.

Further, the rotation limit position of the arm 17 is regulated by the stopper portion 23, and rotation is stopped when the turbulence gear 21 meshes with the driven gear 14 at a regular meshing depth.

Therefore, for example, the arm 17 may be rotated too much and the teeth of the drive gear 21 may become stuck in the teeth of the driven gear 14, thereby causing the torque required to rotate the gear 21.14 to be too large. There is no problem that the rewind reel shaft 11 cannot be rotated at the normal rewind speed.

When the force applied to the operation knob 5 is released, the locking arm 1
The locking plate 32 is rotationally displaced to the stop position by the force of the spring 37 that presses the locking plate 36, and the pin 36a engages with the engagement groove 32b, so that the locking plate 32 is kept in the stopped state.

At the same time, the contact pieces 41a and 41C are separated from each other, the motor 16 is de-energized, and the tape rewinding is stopped.

As mentioned above, the operating mechanism of the tape recorder according to the present invention has a recording release position between the stop position and the rewind position of the locking mechanism of the operating knob that switches the tape drive system between feeding, stopping, and rewinding modes. is provided so that the recording canceling mechanism does not operate when the operating knob is operated from the forward position to the stop position in recording mode, and the operating knob is operated beyond the stop position to the recording canceling position before the rewind position. The device is configured so that the recording release mechanism can be activated, and only the lock of the recording knob can be released while the tape is stopped to enter playback mode, making it suitable for use with the operating mechanism of a dictation recorder that is operated while recording is interrupted. In addition, if you want to switch from recording mode to playback mode without changing the tape position,
All you have to do is move the operating knob to the recording release position. Therefore, unlike conventional tape recorders, when canceling recording mode, it is necessary to move the operating knob to the rewind position. The part was rewound,
For example, it has a feature that it is possible to reliably prevent the inconvenience of erasing the end of the previously recorded portion when recording is continued after recording is canceled.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the operating mechanism of the tape recorder according to the present invention, FIGS. 2A and B are bottom views of the operating mechanism of the tape recorder in playback mode and recording mode, respectively, and FIG. 3 A, B and FIG. 6 are bottom views of the main parts of the locking mechanism of the tape drive mechanism when the locking mechanism is fed and switched to stop, cancel recording, and rewind, respectively. .

Claims (1)

[Scope of utility model registration request] A recording knob that is normally on the playback mode side and is locked to the recording mode side during recording, an operation knob that switches the tape running mode to forward, stop, and rewind;
A locking mechanism that locks at each rewind position and further locks at a recording release position provided between the stop and rewind locking positions; When the recording knob is locked in this position, the recording knob remains in the locked state, and when the operation knob is operated beyond the above-mentioned stop position and locked in the recording release position in order to shift from the recording mode to the playback mode. An operation mechanism for a tape recorder comprising a recording release mechanism for stopping the tape and unlocking the recording knob in connection with the operation.