JPS6331223Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the operating mechanism of a tape recorder, and variably adjusts the point in time at which the driving gear, which is arranged so that it can come into contact with and separate from the driven gear, starts to be displaced in the direction of meshing with the driven gear. By adopting a configuration that allows the tape drive motor to be energized after the driving gear meshes with the driven gear, it is possible to eliminate the noise of gear meshing at the start of tape running, and to ensure that both gears are always properly meshed. An object of the present invention is to provide an operation mechanism for a tape recorder configured to be able to rotate the tape recorder in any state.

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. It is configured to switch to playback. Therefore, for example, when recording, the recording knob is pressed to lock the tape into 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 lock of the recording knob on the recording mode side cannot be released unless the operation knob is moved to the rewind position when canceling recording, and for this reason, the tape is partially 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. It had drawbacks.

Furthermore, as the tape recorder becomes smaller, the tape drive motor must also be made smaller, so it is necessary to ensure torque transmission even 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 drive gear.

However, in the conventional tape recorder described above, 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.
For this reason, it has drawbacks such as unpleasant noises being generated from the gear train when the tape starts running, and furthermore, the tape running is unpredictable because power is not transmitted reliably between the gears. .

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings. 1st
The figure is a plan view of one 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 FIGS. FIGS. 6A and 6B are bottom views of the main parts of the locking mechanism in a state in which the tape running mode is switched to feeding, stopping, recording canceling, and rewinding modes, respectively.

In Figures 1 and 2, the tape recorder 1 is a handy type used for example for dictation recording, and after the ultra-small cassette 2 is installed in a predetermined position on the chassis 3, the recording knob 4 and the operating knob 5 are pressed with one hand. Recording and playback are possible by operation. 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 operation knob 5, but in this embodiment, the above In addition to the three modes, a recording cancel mode is added in which recording can be canceled while the tape 6 is stopped and the mode can be set to playback mode.

On the upper surface of the chassis 3, a recording/playback head 7 and a cylindrical body 8 for mounting an erasing head are arranged along the tape running path.
The cylindrical body 8 is rotated by a certain angle by operating the recording knob 4, and an erasing head 8a embedded in the circumferential surface of the cylindrical body 8 comes into contact with the tape 6 to erase the recording of that portion.

The cassette 2 is positioned by a pair of cassette guides 9 and 10 and placed at a predetermined position on the chassis 3, and at this time the rewind reel and the take-up reel are fitted onto the shafts 11 and 12, respectively. 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. On the other hand, the shaft 12 to which the take-up reel fits
has a disk-shaped rotor 1 with a larger diameter than the gear 13.
5 is integrally attached to the rotor 15, and a rubber material or the like having a large coefficient of friction is fixed to the circumferential surface of the rotor 15 in the form of a band. This rotor 15 serves as a reel stand on which a take-up reel is placed.

The tape drive motor 16 has a flywheel 18 supported on the tip of the arm 17 as shown in FIG.
are connected to each other via a belt 19. Arm 1
Reference numeral 7 has an L-shape, and is pivotally supported by a pin 17a 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. . The shaft that supports the flywheel 18 is used as a capstan 20 that drives the rotor 15, and a drive gear 21 that meshes with the driven gear 14 and transmits power from the motor 16 is integrated with the capstan 20. installed on. 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 limits the rotation of the pin 22 in the clockwise direction in FIG. Regulate location. When the pin 22 is brought into contact with the stopper portion 23, the driving gear 21 meshes with the driven gear 14 in a normal meshing state, that is, in a state in which the teeth mesh with each other at an appropriate depth.

Reference numeral 24 denotes 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. Brake or release the brake.

The arm 17 and the brake plate 24 are connected to one end of levers 27 and 28, respectively, 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 intersect with each other. There is. Therefore, the more the lever 27 is rotated clockwise in FIG. 2, the greater the force is stored in the spring 29, and the more the force that urges the arm 17 in the counterclockwise direction in the figure increases.

Further, 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.
4 is also rotationally displaced in the same direction, and the brake is released.

Pins 27a and 28a are implanted at the other ends of the pair of levers 27 and 28, respectively, and these pins 27a and 28a are engaged with cam grooves 33 and 34 formed on the upper and lower surfaces of the locking plate 32, respectively. It matches. The locking plate 32 is provided integrally with the operation knob 5, and is rotatably supported on a pin 35. Four engaging grooves 32a, 32b, 32c, and 32d are formed on the circumferential surface of the locking plate 32, corresponding to four locking positions, that is, feed, stop, recording release, and rewind. , a pin 3 implanted at one end of the locking arm 36
6a is engaged and locked in one engagement groove. 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 take your hand off the operating knob 5, but in the recording release position and the rewind position, your hand is removed from the operating knob 5. When released, spring 37
The locking plate 36 is returned to the stop position by this force.

Furthermore, the locking plate 32 is connected to a lock lever 39 via a rod 38, and the rod 38 locks the lock lever 39 in the recording release position and rewind position.
9 in the counterclockwise direction in FIG. 2, the lock lever 39 releases the lock on 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 connected to the lock lever. 39 does not lock. 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 on 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. . The switch mechanism section 41 has the contact piece 41
Two contact pieces 41b and 41c are provided in addition to the contact piece 41a, and the contact piece 41a contacts the contact piece 41b or 41c and conducts with each other, whereby 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. An arm 44 is rotatably provided on a pin 43 that engages with a guide hole 42 of the recording knob 4.
The displacement of the recording knob 4 is transmitted to the recording knob 4 through a pin 45 installed on the upper surface of the recording knob 4.

Reference numeral 46 denotes a slide plate, to which the displacement of the arm 44 is transmitted via a pin 47 implanted on its upper surface, and is displaced in a direction opposite to the direction in which the recording knob 4 is displaced. A protrusion 46 a is formed on the side of the slide plate 46 , and the protrusion 46 a has a pin 8 b that is implanted on the lower surface of the cylindrical body 8 and is inserted into a groove drilled in the chassis 3 .
As the slide plate 46 is displaced, the cylindrical body 8 is rotated by a predetermined angle. 4
8 is 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.

During regeneration, the capstan 20 is securely pressed against the circumferential surface of the rotor 15, and the tip of the adjustment screw 30 is spaced apart from the end of the spring 29 by an appropriate distance.

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 piece 41a of the switch mechanism section 41,
The driving gear 21 meshes with the driven gear 14 at a timing earlier than when the gear 41c is closed.

These conditions can be easily achieved by several trials.

The operation knob 5, the switch mechanism 41, the tape drive motor 16, the spring 29, the drive gear 21, the driven gear 14, the adjustment screw 30, etc. constitute the main parts of the present invention.

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

First, for playback, the operation knob 5 is rotated counterclockwise in FIG. 1 to the position shown by the solid line using, for example, the thumb. As a result, the locking plate 32 integrated with the operating knob 5 is rotated clockwise in FIG. Engaged in the groove 32a, the locking plate 32 is kept in this position, ie the playback 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, so that the lever 27 can freely rotate. 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 is moved by the spring 17.
b, and is rotated clockwise in FIG. As a result, the capstan 20 provided at the tip of the arm 17 comes into contact with the circumferential surface of the rotor 15.

At the same time, the pin 2 at the tip of the lever 28
8a rides on the cam surface 34a in the cam groove 34 of the locking plate 32 as shown in FIG.
pulls the brake plate 24 clockwise in FIG.
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.

Further, as the operating knob 5 is rotated, the contact piece 41a
The contact pieces 41b and 41b contact each other, and the drive motor 16 is energized. When the motor 16 starts, the belt 1
The flywheel 18 rotates at a constant speed via the shaft 9, 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. 1, the locking arm 36 engages with the engagement groove 32b, and the locking plate 32 is held at the stop 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.
7 is rotated counterclockwise in FIG. 2 against the spring 17b by the spring force of the spring 29 via the adjustment screw 30. 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. Furthermore, as the operating knob 5 is rotated, the pin 28a of the lever 28 engages with the cam surface 34b of the cam groove 34 as shown in FIG. 4B, so the lever 28 is rotated counterclockwise in the figure. do. As a result, the brake plate 24 is released from the tension exerted by the rod 31 and rotated counterclockwise in FIG. Therefore, the rotor 15 is cut off from power transmission from the motor 16 and is braked by the brake section 24a.

Further, as the operating knob 5 is rotated, the contact piece 41a
Since the contact pieces 41b are separated from each other and the power to the motor 16 is cut off, the motor 16 is also stopped substantially at the same time as the rotation of the take-up reel shaft 12 is stopped, and the winding is completed.

Here, the spring force of the spring 29 is set to be sufficiently larger 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 and the rotor 15 are moved between the capstan 20 and the rotor 15 for an appropriate amount of time when stopped. They are spaced apart and facing each other.

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 44 in the counterclockwise direction in FIG. 2, so that the slide plate 46 is pushed by the arm 44 and is displaced to the right in the figure. 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 its surface 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 contact pieces 41a and 41b come into contact with each other as in the above-mentioned regeneration, and the motor 16 is energized, and the brake part 24
The braking caused by a is released, and the take-up reel shaft 12 is thereby driven in the tape winding direction, and the recording/recording
A recording is made on the tape 6 by the playback 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, the tip of the rod 38 that connects 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, so the operation knob 5 can be used to control the feed and stop. The lock lever 39 does not move while the recording knob 4 is being operated in the recording mode. Therefore,
Recording and recording stop operations can be repeated while the recording knob 4 is held at the recording position.

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.
It engages with the engagement groove 32c of. At this time, lever 2
7 pin 27a is inserted into the cam groove 33 as shown in FIG. 5A.
Since the lever 27 rides on the cam surface 33c of the arm 17, the lever 27 is slightly rotated clockwise in the figure.
The spring 29 rotates slightly clockwise in the figure due to the force of the spring 29. However, due to the adjustment of the adjustment screw 30 described above, the drive gear 21 does not mesh with the driven gear 14. Furthermore, simply rotating the operation knob 5 to the recording cancel position does not bring the contact pieces 41a and 41c into contact with each other as shown in FIG. 5B, and therefore the motor 16 is not energized.

On the other hand, as the locking plate 32 rotates, the rod 3
8 rotates the lock lever 39 in the counterclockwise direction in FIG. It will slide back until it returns. Further, as the recording knob 4 is unlocked, the slide plate 46 also returns to the position in the playback mode, so the cylindrical body 8 is rotated and the erasing head 8 is rotated.
a is separated from the tape 6.

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

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 caused by erasing the end of the previously recorded portion when the last recorded portion is shifted and, for example, one wishes to continue recording after canceling recording.

Next, when rewinding, the operating knob 5 is rotated beyond the recording cancel position to the rewinding position shown by the three-dot chain line in FIG. As a result, the pin 36a of the locking arm 36 moves beyond the locking groove 32c of the locking plate 32 to the locking groove 32d.

At this time, the pin 27a of the lever 27 is
As shown in FIG. 2, the lever 27 rides on the cam surface 33d of the cam groove 33, which is further inward than the cam surface 33c, so that the lever 27 is largely rotated clockwise in the figure. As a result, the spring 29 strongly presses the adjustment screw 30, thereby moving the arm 17 to the counterclockwise rotation limit position in FIG.
It is rotated and displaced to the position where it abuts and locks with 3. 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. 6B, and the braking of the brake part 24a against the rotor 15 is released, and the contact pieces 41a and 41c are brought into contact with each other. motor 16
is energized, the rewind reel shaft 11 is rotated in the tape rewinding direction by transmitting power from the motor 16 to the flywheel 18, drive gear 21, driven gear 14, and gear 13 in this order.

Here, the screwing amount of the adjustment screw 30 is determined at the timing when the driving gear 21 contacts the driven gear 14, that is, the timing when the driving gear 21 comes into contact with the driven gear 14, so that the motor 16 is energized after the driving gear 21 meshes with the driven gear 14.
The point at which the rotation starts is adjusted. Therefore,
If the motor 16 is energized before the driving gear 21 and the driven gear 14 are not completely meshed, the two gears 21 and 14 cannot be rotated in the normal meshing state, or the meshing of the gear 21 and the gear 14 may be incorrect. It is possible to reliably prevent inconveniences such as the generation of loud noise due to poor performance.

Further, the rotation limit position of the arm 17 is restricted by the stopper portion 23, and the driving gear 21 is regulated by the driven gear 1.
Rotation stops when it engages with 4 at the regular engagement depth. Therefore, for example, if the arm 17 is rotated too much, the teeth of the driving gear 21 may be dislocated by the driven gear 14.
This causes the gear 21,
There is no problem such as when the torque required to rotate the rewind reel shaft 14 is too large and the rewind reel shaft 11 cannot be rotated at the normal rewind speed.

When the force applied to the operating knob 5 is released, the locking plate 32 is rotated to the stop position by the force of the spring 37 pressing against the locking arm 36, and the pin 36a engages with the engagement groove 32b. , kept in a 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 of the present invention includes a switch whose contact piece is displaced in response to the operation of an operating knob that switches the tape running mode to energize or de-energize the tape drive motor, and a switch that energizes or de-energizes the tape drive motor. a drive gear that is coupled to and transmits or non-transmits power for tape running to a driven gear for running the tape, and a rotating arm on which the drive gear is supported;
a rotation control arm that rotates the rotation arm in response to an operation of the operation knob, and the rotation of the rotation arm is controlled by a spring provided on the rotation control arm and a spring provided opposite to and spaced apart from the spring; Since the configuration starts when the adjustment screw, which is provided on the rotary arm and adjusts the spacing, is locked, the drive gear is activated before the tape drive motor is energized when the operation knob is operated. It can be brought into contact with the driven gear and meshed with it, and as a result, the drive motor is energized before the driving gear and driven gear are completely meshed, causing both gears to rotate in a normal meshed state. It is possible to reliably prevent inconveniences such as the inconvenience of not being able to move or the generation of a large noise due to poor engagement, and thereby making it possible to smoothly transition the tape from a stopped state to a running state, etc. It has the following features.

[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 to 6th
Figures A and B are bottom views of the main parts of the locking mechanism of the tape drive mechanism in a state where the locking mechanism is fed and switched to stop, cancel recording, and rewind, respectively. 1...Tape recorder, 5...Operation knob, 14
... Driven gear, 16 ... Tape drive motor, 2
1... Drive gear, 29... Spring, 30... Adjustment screw, 41... Switch mechanism section.

Claims (1)

[Scope of Claim for Utility Model Registration] A switch whose contact piece is displaced in response to the operation of an operation knob for switching the tape running mode to energize or de-energize the tape drive motor; A drive gear that transmits or non-transmits power for running the tape to the driven gear; a rotation arm on which the drive gear is supported; and a rotation control that rotates the rotation arm in response to operation of the operation knob. and an arm, and the rotation of the rotating arm is caused by engagement between a spring provided on the rotation control arm and an adjustment screw provided on the rotating arm at a distance opposite to the spring and adjusting the spacing. An operating mechanism for a tape recorder configured to start from a stopped state.