JPH039137Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a tape recorder, and more particularly to a tape recorder having a motor drive circuit with voltage reduction measures suitable for those equipped with a soft touch operation mechanism using a motor as a power source.

As is well known, in a tape recorder, the various controls used to set the tape in a predetermined running state (recording, playback, fast forward, rewind, etc.) and stop running are light and easy to operate. So-called soft-touch operation has been implemented. The mechanism for performing this soft touch operation is such that when the desired operator is lightly moved in the operating direction without reaching the normal operation position, the rotational drive switch of the operator movement motor is turned on, and the rotational force of the motor is then used. The controller is configured so that the operator is moved in the operating direction.

However, in the conventional soft touch operation mechanism as described above, a switch, a motor, etc. must be provided for each type of operator, making the configuration extremely complex and likely to be large. There is a problem in that it can only be applied to high-quality tape decks, etc., and is not suitable for, for example, small portable tape recorders that use batteries.

Therefore, there is a strong demand for the development of a soft touch operation mechanism that consumes extremely little power so that it can be fully applied to conventional battery-powered tape recorders. In particular, recent soft touch operation mechanisms are not limited to simply reducing power consumption. The product has been designed with careful attention to detail in terms of structure, operation, and maintenance, such as shortening the time from start to finish and taking protective measures in case the battery power is consumed during operation. desired.

This invention was made based on the above-mentioned circumstances, and the object thereof is to provide a tape recorder which is equipped with a soft touch operation mechanism using a motor as a power source, and which has sufficient safety measures taken against voltage reduction.

First, a soft touch mechanism for a tape recorder applied to an embodiment of this invention will be explained in detail with reference to the drawings. That is, Figures 1 and 2
The figure shows a unitized operation element, and first a brief overview of this operation section will be explained. That is, in the figure, numerals 11 to 16 are a stop operator, a recording operator, a rewind operator, a playback operator, a fast-forward operator, and a pause (pause) operator, respectively. Each of these operators 11 to 16 is arranged to be movable in the directions of arrows A and B in the figure, respectively.
Of the above-mentioned operators 11 to 16, recording, rewind, playback, and fast forward operators 12 to 15
are designed to be locked at the operating position where they are pressed in the direction of arrow A, respectively. In addition, the above-mentioned recording, rewinding, playback and fast forwarding operators 12 to 1
The lock at the operation position 5 is released by pressing the stop operation element 11 in the direction of arrow A. Note that this stop operator 11 is
It is not locked in the operating position. Further, the pose operator 16 is locked at the operating position where it is pressed in the direction of arrow A, and when it is pressed slightly again in the direction of arrow A from the locked position, the lock is released and returned to the direction of arrow B, returning to the original position. This is a well-known push-type operation.

The stop, record, rewind, play, fast forward, and pause operators 11 to 16 are biased in the non-operating direction, that is, in the direction of arrow B, by springs 17 to 22, respectively, as shown in FIG. . Here, the springs 17 to 22 are of a type that does not have a very strong biasing force, and the recording, rewinding, playback and fast forwarding controls 12 are
15 to 15 are for simply moving the lock lever, push lever, gear lock lever, etc. to predetermined positions when pressed, and the details will be described later. They also move the head chassis, rewind or fast forward idler, etc. of the tape recorder mechanism to predetermined operating positions. Since the operation slider is not directly operated, it is extremely light and easy to operate.

The stop operator 11 also controls recording, rewinding,
Since it only releases the lock at each operation position of the playback and fast-forward controls 12 to 15, and does not return the direct operation slider from the predetermined operation position to its original state, the operation can be made extremely light. be. Furthermore, also in the pose operator 16,
It only moves the lock lever, push lever, gear lock lever, etc. to a predetermined position, and does not directly operate the pause operation slider that moves the playback idler, pinch roller, etc. of the tape recorder mechanism, so it is light and easy to operate. It is becoming possible to do so.

That is, the stop, record, rewind, play, fast forward, and pause operators 11 to 16 are used to select and set a desired state from among multiple types of operating states and stop states of the tape recorder, respectively, and to directly operate the tape recorder. It is not intended to be activated or deactivated.

FIG. 3 shows a specific configuration of such an operating section. That is, each of the above-mentioned operators 11 to 16 is attached to one end of each of the operating members 23 to 28, respectively. And each of these operating members 2
3 to 28 have their one ends inserted into through holes 291 to 296 formed in the mounting base 29, respectively, and are supported so as to be movable in the directions of arrows A and B. Further, a retaining plate 30 is provided on the mounting base 29.
It is attached by screws 31, 31, 31.
This retaining plate 30 includes a protective slider 32 which will be described later.
is supported by screws 33, 33 so as to be slidable in the longitudinal direction.

Further, on both ends and the back side of the mounting base 29, fittings 34 to 36 for attaching this unitized operation section to the tape recorder mechanism section are attached by screws 37, 37, 37, respectively. ing. Furthermore, a support 39 to which a switch 38 is attached is attached to the right end of the mounting base 29 in the figure.

Here, elongated holes 231 to 281 extending in the longitudinal direction of the operating members 23 to 28 are formed at the other ends of each of the operating members 23 to 28, respectively. Then, each of the long hole portions 231 to 281
A shaft 40 passes through the shaft 40, and both ends of the shaft 40 have through holes 341 formed in the fittings 34, 35,
351 and are respectively fitted and supported. Further, this shaft 40 is connected to leg portions 41 provided at both ends of a gear lock lever 41 that is formed to straddle the operating members 24 to 28 other than the operating member 23.
1,412 through holes 413, 414 to rotatably support the gear lock lever 41. A gear lock pin 415 is provided approximately at the center of the gear lock lever 41 and projects outward. Further, a projecting piece 416 is formed at the right end of the gear lock lever 41 in the figure, which engages with the switch 38 and can turn the switch 38 on and off in accordance with the rotation of the gear lock lever 41.

Here, the operating members 24 to 28 other than the operating member 23 are provided with the aforementioned lock lever, push lever, and the like. FIG. 4 shows the state in which the lock lever and push lever are installed. Here, only the operating member 26 to which the regeneration operator 14 is attached will be explained, and the other operating members 2
4, 25, 27, and 28 have similar configurations, so the explanation thereof will be omitted.

That is, the operation member 26 has two side plates 262 and 263 (only one side plate 262 is shown in FIG. 4) aligned with each other from the substantially central portion to the other end to which the playback operation element 14 is not attached. It is formed so that it can be installed. And both side plates 262, 263
connects the upper end center part and the other end part in the figure to the connecting part 2
64,265. here,
A lock lever 42 is supported by a shaft 43 approximately at the center of the operating member 26 and between the two side plates 262 and 263 so as to be rotatable in the directions of arrows C and D in the figure. This lock lever 42 is formed in an abbreviated shape, with its base end 421 protruding downward in the drawing of the operating member 26, and the distal end portions of two pieces facing each other projecting upward in the drawing of the operating member 26. It is supported. Furthermore, a stepped portion 422 is formed at the tip of one of the two mutually opposing pieces of the lock lever 42. moreover,
The above-mentioned spring 21 is engaged between the base end 421 of the lock lever 42 and the mounting base 29, and urges the lock lever 42 to rotate in the direction of arrow C, and simultaneously operates the lock lever 42. The member 26 is urged in the direction of arrow B.

Further, the lock lever 42 and the connecting portion 26
4, a playback operation slider 44 is interposed. This playback operation slider 44 is supported by, for example, a main chassis 49 of the tape recorder mechanism so as to be able to slide vertically in the figure, and when it is slid upward in the figure, it moves a head chassis (not shown), a playback idler, etc. (not shown) to the tape playback state. The object is moved to the corresponding position. A notch 441 is formed in the lower part of the reproduction operation slider 44 in the figure. Furthermore, an engagement hole 442 is formed in the upper part of the notch 441 of the regeneration operation slider 44 at a position corresponding to the step 422 of the lock lever 42 .

Here, one end of the push lever 45 is inserted into the notch 441 of the regeneration operation slider 44, and the tip of the one end is connected to the lock lever 4.
It faces the axis 43 of No. 2. This push lever 45 has its substantially central portion at one end of a substantially L-shaped transmission lever 46 which is rotatably supported by the shaft 40 being inserted into the corner between the side plates 262 and 263 of the operating member 26. It is supported by a shaft 47 on a portion 461 so as to be rotatable in the directions of arrows E and F in the figure. The other end 462 of the transmission lever 46 faces the lower end of the gear lock lever 41 in the figure. Here, the other end of the push lever 45 is formed with an engaging portion 451 against which a drive slider, which will be described later, comes into contact. Further, a locking portion 452 formed on the lower side of the push lever 45 and the mounting base 2
By locking the spring 48 between the locking portion 297 formed in the push lever 4
5 is biased in the direction of arrow F about the shaft 47, and the transmission lever 46 is biased counterclockwise in the figure about the shaft 40.

Here, a playback operation slider 44 is interposed between the lock lever 42 and the connecting portion 264 of the operation member 26 to which the playback operation element 14 is attached, but other functions such as recording, rewinding, fast forwarding, etc. Between each lock lever provided on each operation member 24, 25, 27, 28 to which the pose operation elements 12, 13, 15, 16 are attached and the connecting part, there is a recording,
There are operation sliders for rewinding, fast forwarding, and pausing.

In this state, the gear lock lever 41
The gear lock pin 415 is inserted into a through hole 511 formed in a predetermined portion of a cam gear 51 that is rotatably supported by the main chassis 49 of the tape recorder mechanism section about a rotating shaft 50. This cam gear 51 has a notch 5 in a part as shown in FIG.
12 are formed. And this cam gear 5
A gear 54 fitted onto a rotating shaft 53 of a flywheel 52 rotatably supported by the main chassis 49 is provided at a position corresponding to the first notch 512 . In addition, the flywheel 52
The rotating shaft 53 is extended to form a capstan. Further, the rotational force of a motor 55 is transmitted to the flywheel 52 via a belt 56.

Here, the cam gear 51 has a notch 51
2 is in a position facing the gear 54, the through hole 5
The gear lock pin 415 of the position gear lock lever 41 is inserted into the position gear lock lever 41. Further, when the notch 512 of the cam gear 51 is in a position facing the gear 54, the cam gear 51 is urged to rotate in the direction of arrow G in the figure by the action of a spring, which will be described later. Since it is inserted into the hole 511, the cam gear 51
is prevented from rotating, and the cam gear 51 and gear 54 do not mesh with each other.

Furthermore, the gear lock pin 415 of the gear lock lever 41 is connected to the through hole 511 of the cam gear 51 by a spring 57 that is engaged between the gear lock lever 41 and the main chassis 49.
is biased in the direction of intervening within the body.

Here, a cam 513 as shown in FIG. 6 is formed in the cam gear 51. As shown in FIG. The cam 513 is formed in a substantially semicircular shape as shown in the figure, but the part of the arc portion on the right side of the rotation shaft 50 in the figure is curved so as to have a steep rise. The left side of the figure is curved so that the rise is gradual. The cam 513 is connected to the cam gear 51
The position where the notch 512 faces the gear 54, that is, the position where the gear lock pin 4 of the gear lock lever 41
15 is inserted into the through hole 511 of the cam gear 51, its flat portion 514 is formed into a substantially L-shape, and its corner portion is rotatably supported on the main chassis 49 by a rotation shaft 58. The drive lever 59 is arranged so as to face one part of the drive lever 59.

Furthermore, a leaf spring 60 is provided on one side of the drive lever 59 to extend toward the tip.
This plate spring 60 has a tip end that is connected to the drive lever 5.
A substantially U-shaped locking portion 5 formed at the tip of one side of 9
91 is locked. In addition, the drive lever 5
The other end of the drive lever 9 is engaged with a usable switch 61 similar to the switch 38 described above, and is turned on and off in response to rotation of the drive lever 59.

Here, the leaf spring 60 of the drive lever 59 is
The drive slider 62 is disposed opposite to one side of the drive slider 62, which is formed in a substantially L-shape. This drive slider 6
2, screws 63 and 63 are inserted into elongated holes 621 and 622, respectively, which are formed long in the vertical direction at predetermined positions.
is inserted through the main chassis 49 and screwed onto the main chassis 49, so that the main chassis 49 is supported so as to be able to slide freely in the vertical direction in the figure. Also,
The other part of the drive slider 62 and the drive lever 59
A spring 64 is engaged between the drive lever 59 and one portion of the drive lever 59, so that the drive lever 59 is biased clockwise in the figure, based on the drive slider 62. At this time, the drive lever 59 is
One part of the drive lever 59 engages with the flat part 514 of the drive slider 62, and its rotation in the clockwise direction in the figure is caused by the extension part 62 formed on the other part of the drive slider 62.
3, and the cam gear 51
A rotational force in the direction of arrow G is applied to. Further, this drive slider 62 is urged upward in the figure by a spring (not shown).

The operation of the above configuration will be explained below. First, as shown in FIG. 7, the playback operator 14 is pressed in the direction of arrow A. Then, the operating member 26 also moves in the same direction and is locked at the operating position by a locking mechanism to be described later, and the gear lock lever 42 supported by the operating member 26 via a shaft 43 has its stepped portion 422 set for regeneration. By coming into contact with the wall surface of the operation slider 44, it is rotated in the direction of arrow D against the biasing force of the spring 21. In other words, at this time, the stepped portion 422 of the lock lever 42 is pressed against the wall surface of the regeneration operation slider 44 by the biasing force of the spring 21.

Furthermore, when the operating member 26 is moved in the direction of arrow A, the shaft 43 comes into contact with one end of the push lever 45, and the push lever 45 is also moved in the direction of arrow A against the biasing force of the spring 48. At this time, the engaging portion 451 of the push lever 45 reaches directly below the drive slider 62 in the figure. Then,
A transmission lever 46 whose one end 461 is rotatably supported by this push lever 45 via a shaft 47
is rotated clockwise in the figure around the shaft 40. At this time, the other end 462 of the transmission lever 46
comes into contact with the lower end of the gear lock lever 41 in the figure,
The gear lock lever 41 is rotated counterclockwise in the figure. Therefore, the gear lock pin 415 is removed from the through hole 511 of the cam gear 51, and the switch 38 is driven.

Then, as mentioned earlier, the cam gear 51 is normally urged to rotate in the direction of the arrow G in FIG. Therefore, when the gear lock pin 415 is removed from the through hole 511, the cam gear 51 is rotated in the direction of arrow G and meshes with the gear 54. Here, the motor 55 is rotated in the direction of arrow H in FIG. 6 by being supplied with power supply voltage via the switch 38.
A flywheel 52 and a gear 54, which are connected to each other via a belt 56 so as to transmit rotational force, are also rotating in the same direction. Therefore, the cam gear 51 meshed with the gear 54 continues to rotate in the direction of arrow G as shown in FIG.

At this time, due to the rotation of the cam gear 51, the cam 5
13 also rotates, and its arcuate portion abuts one portion of the drive lever 59, and the curved bulge portion rotates the drive lever 59 counterclockwise in the figure about the rotation shaft 58. The leaf spring 60 provided on the drive lever 59 is connected to the drive slider 6.
2, and the drive slider 62 is slid downward in the figure. Then, as shown in FIG. 9, the drive slider 62 comes into contact with the engaging portion 451 of the push lever 45, and the push lever 45 is rotated about the shaft 47 in the direction of arrow F in the figure. Therefore, the other end of the push lever 45 separates from the shaft 43, engages with the notch 441 of the regeneration operation slider 44, and pushes the regeneration operation slider 44 upward in the figure.

When the playback operation slider 44 reaches a predetermined operation position, it will no longer move upward in the figure from that position, and the push lever 45 will also no longer rotate. However, since the rotation stroke of the drive lever 59 is set to be long with some allowance, the rotation of the push lever 45 stops and the drive slider 6
Even if the movement of No. 2 is stopped, the drive lever 59
It is rotated clockwise in the figure. At this time, the overstroke of the drive lever 59 is absorbed by the leaf spring 60.

Here, even if one end of the push lever 45 separates from the shaft 43, the drive slider 62 remains attached to the holding portion 45 formed near the engaging portion 451 of the push lever 45.
3, the push lever 45 and drive slider 62 will not be inadvertently separated due to the biasing force of the spring 48. Further, while the cam gear 51 is rotating, the gear lock pin 415 is pressed against a portion of the cam gear 51 where the through hole 511 is not provided by the spring 57 (see FIG. 5).

As mentioned above, when the playback operation slider 44 is pushed upward in the figure, the head chassis, playback idler, etc. are moved to positions corresponding to the tape playback state, and playback operations are performed here. It is something. That is, when the regeneration operation slider 44 is slid upward in the figure, the engagement hole 442 formed in the regeneration operation slider 44
reaches a position corresponding to the step 422 of the lock lever 42. Then, since the step portion 422 of the lock lever 42 is pressed against the wall surface of the regeneration operation slider 44, the step portion 422 is inserted into the engagement hole 422 of the regeneration operation slider 44, and the lock lever 42 is inserted into the regeneration operation slider 44. Hold in the raised position. Then, when the cam gear 51 rotates and reaches a position where its notch 512 faces the gear 54,
Again, the flat part 514 of the cam 513 is connected to the drive lever 59.
The position corresponds to one side of the . At this time, the drive slider 62 is slid upward in FIG. 8 by the action of the spring, and at the same time, the through hole 511 of the cam gear 51 comes to a position corresponding to the gear lock pin 415, so that the gear lock lever 41 is moved as shown in FIG. The gear lock pin 415 is through hole 51
1, the cam gear 51 is returned to its initial state so as to prevent its rotation. Further, since the drive slider 62 separates from the engaging portion 451 of the push lever 45, the push lever 45 is pulled by the biasing force of the spring 48, and the transmission lever 46 is moved away from the shaft 45.
It is moved to a position rotated counterclockwise in the figure around the center. Therefore, the push lever 45 and its engaging portion 451 are located outside the movement path of the drive slider 62. The playback operation slider 44 is then locked at the position pushed up by the stepped portion 422 of the lock lever 42.

In this case, when the gear lock lever 41 returns, the switch 38 is also brought into a non-operating state. During this time, the switch 38 is activated via a switch slider of a tape recorder mechanism (not shown) in conjunction with the playback operation slider 44 which is locked in the operating position. Then, the main switch for driving the motor is put into a driving state and tape playback operation is started.

In addition, the above operation can be similarly explained for other recording, rewind, fast forward, and pause operators 12, 13, 15, and 16, and corresponds to each operator 12, 13, 15, and 16 during operation. The push lever is moved to a position where it can be engaged with the drive slider 62, and the gear lock pin 415 of the gear lock lever 41 is disengaged from the through hole 511 of the cam gear 51. The slider) is moved and the slider is rotated at that position.

Next, a description will be given of a motor drive circuit that takes measures against voltage reduction in a tape recorder equipped with the soft touch operation mechanism as described above.

That is, in FIG. 11, _S1 is a pre-switch corresponding to the switch 38 controlled by the gear lock lever 41 of the soft touch operation mechanism described above, and one end is connected to the collector of the transistor _Q1 constituting the switching circuit. has been done.
The other end of the pre-switch _S1 is connected to one end of a motor M corresponding to the motor 55 through a diode _D1 having the polarity shown, and is also connected to the base of a transistor _Q2 through a resistor _R1 .

Further, _S2 is a main switch controlled by a switch slider of a tape recorder mechanism (not shown) that is linked to the aforementioned playback operation slider 44, etc., and one end thereof is constituted by the collector of the transistor _Q1 , a battery, etc. It is commonly connected to the power supply (+B), and the other end is connected to one end of the motor M. Here, the other end of the motor M is grounded.

And the base of the transistor _Q1 is a resistor
R ₂ and a Zener diode ZD ₁ of the polarity shown are connected in series to ground, and connected to the emitter of the transistor through a capacitor C ₁ for preventing rush current, and connected to the emitter of the transistor through a resistor R ₃ .
Connected to _Q2 collector. Here, the emitter of transistor _Q2 is grounded.

The other end of the pre-switch _S1 is connected to the movable contact C of the recording/playback switch _S3 . The recording side contact REC of this recording/playback switch _S3 is connected to the muting signal input terminal of a recording system muting circuit MUTE ₁ inserted into the output section of the recording amplifier _A1 in the recording circuit system. Similarly, the reproduction side contacts P and B are connected to the muting signal input terminal of a reproduction system muting circuit MUTE ₂ inserted at the output section of the reproduction amplifier A ₂ in the reproduction circuit system.

In the above-described circuit configuration, as described above, first, the pre-switch _S1 , which is interlocked with the operating mechanism and is substantially driven for a predetermined period of time, is driven. However, in this state, transistor _Q1 has a power supply (+) applied to its emitter.
B) If the voltage is less than the reference voltage E _R due to the Zener diode ZD ₁ applied to its base, it cannot be in the on state. That is, in this state, the motor M is forced to be in the OFF region by preventing it from being driven. By this, for example, if +B = 12V, E _R ≒ 10V, and +B
> _ER By setting the relationship, it is possible to prevent any operation from occurring when the voltage of a battery power supply or the like is reduced.

The reason for this is that if such safety measures are not taken, the motor M may be temporarily driven with reduced voltage, and immediately after that, the motor M may no longer be driven. This is because if the voltage is reduced to an extent that cannot be avoided, an inconvenient situation may occur in which the tape recorder mechanism is stopped in a halfway state. In particular, the soft touch operation mechanism using the motor M as described above is undesirable because the operation itself becomes incomplete.

Since the appearance of such voltage reduction is greatly influenced by the characteristics of the battery used, it is extremely desirable for safety to prevent the motor M from operating when the voltage decreases beyond a certain level. be.

On the other hand, when the power supply (+B) voltage is equal to or higher than the reference voltage _ER , the transistor _Q1 is turned on and the motor M is put into operation. This allows the tape recorder mechanism to be brought into a predetermined operating state.

At this time, the pre-switch _S1 is brought into a non-operating state, but during this time, as described above, the main switch _S2 is brought into a driving state almost immediately before the end of the driving period of the pre-switch _S1 , so that it cannot be operated any more. The descending motor M is powered from the main switch _S2 (+B)
A voltage is applied to the drive state.

Note that the transistor _Q2 is used to continue operating the motor M even if a sudden voltage reduction occurs immediately after the motor M is operated. So in this case the transistor
By applying a predetermined potential from the collector side of Q ₁ to the base of transistor Q ₂ in a feedback manner via pre-switch S ₁ to turn on transistor Q ₂ , the base voltage of transistor Q ₁ is changed from reference voltage E _R. This is to forcibly set the potential to approximately the ground potential to energize the transistor _Q1 in the on direction.
This is to prevent the tape recorder mechanism from stopping prematurely as mentioned above, and if the motor M is stopped immediately after starting, it will restart if a large current is not required due to impedance etc. This is also to prevent things from becoming impossible.

Furthermore, while the pre-switch _S1 is being driven, muting is applied to either the recording circuit system or the playback circuit system via the recording/playback selector switch _S3 , so that undesirable drop noises etc. that occur during this time are output. It goes without saying that this invention is not limited to the embodiments described above and illustrated, and that various modifications and applications can be made without departing from the gist of this invention. do not have.

Therefore, as described in detail above, according to this invention, it is possible to provide a tape recorder which is provided with sufficient safety measures by measures against voltage reduction, especially in those equipped with a soft touch operation mechanism using a motor as a power source.

[Brief explanation of drawings]

1 to 10 are diagrams for explaining a soft touch mechanism for a tape recorder used in an embodiment of this invention, and FIG. 11 is a diagram showing an embodiment of a motor drive circuit for a tape recorder according to this invention. FIG. S ₁ ... Pre-switch, S ₂ ... Main switch,
Q ₁ , Q ₂ ...transistor, D ₁ ... diode,
ZD ₁ ... Zener diode, R ₁ ~ _{R 3} ... Resistor.

Claims (1)

[Scope of utility model registration request] A soft touch operating mechanism for bringing the tape recorder mechanism into a desired operating state; a motor serving as a power source for the soft touch operating mechanism; is connected between a pre-switch connected to the motor and the other end of the pre-switch and a power source, and when the pre-switch is in a driving state and the voltage of the power source is below a reference voltage, the motor is brought into a non-driving state. and a switching circuit that puts the motor into a driving state when the voltage is equal to or higher than the reference voltage, and a switching circuit that is connected between the switching circuit and the motor so that when the pre-switch is in the driving state, the switching circuit once puts the motor into the driving state. After that, a control circuit is connected between the power supply and the motor to force the switching circuit to maintain the driving state of the motor regardless of the voltage value of the power supply. Therefore, the main switch is energized to the driving state substantially immediately before the end of the driving period of the pre-switch in response to the soft touch operation mechanism being driven to bring the tape recorder mechanism into a desired operating state. Equipped with a tape recorder.